FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Warpinski, NR Sullivan, RB Uhl, JE Waltman, CK Machovoe, SR AF Warpinski, NR Sullivan, RB Uhl, JE Waltman, CK Machovoe, SR TI Microseismic fracture mapping using perforation-timing measurements for velocity calibration SO JOURNAL OF PETROLEUM TECHNOLOGY LA English DT Article AB Microseismic mapping of hydraulic fractures is improved by use of crosswell data to calibrate or verify dipole-sonic velocity data. The microseismic technique uses an array of triaxial receivers to detect microearthquakes induced by a fracture treatment to provide a real-time image of the fracture and the direction in which it propagates. To apply this technique, receiver orientation must be determined by detecting perforations or other energy sources in the treatment well. The ultimate goal is improved accuracy in microseismic mapping, but the results are useful in assessing the applicability of dipole-sonic logs. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Warpinski, NR (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 4 PU SOC PETROLEUM ENG PI RICHARDSON PA 222 PALISADES CREEK DR,, RICHARDSON, TX 75080 USA SN 0149-2136 J9 J PETROL TECHNOL JI J. Pet. Technol. PD AUG PY 2004 VL 56 IS 8 BP 40 EP + PG 2 WC Energy & Fuels; Engineering, Chemical; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA 843QZ UT WOS:000223100900007 ER PT J AU Gweon, GH Zhou, SY Lanzara, A AF Gweon, GH Zhou, SY Lanzara, A TI Strong influence of phonons on the electron dynamics of Bi2Sr2CaCu2O8+delta SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL ID T-C; SELF-ENERGY; CUO2 PLANE; SUPERCONDUCTORS; PHOTOEMISSION; DISPERSION; LA1.85SR0.15CUO4; TEMPERATURE AB The sudden change of the velocity, so-called 'kink', of the dispersing peak in angle resolved photoelectron spectroscopy is a well-known feature in the high-temperature superconducting cuprates. Currently, the origin of the kink is being much debated, but a consensus has not emerged yet. Here, we present a study of the momentum evolution of the kink structure from the nodal region towards the anti-nodal region, for optimally doped Bi2Sr2CaCu2O8+delta sample. We show that the observed temperature dependence of the kink structure in both regions of the momentum space is consistent with a scenario in which phonons contribute strongly to the kink. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM alanzara@lbl.gov RI Zhou, Shuyun/A-5750-2009 NR 29 TC 11 Z9 11 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1397 EP 1401 DI 10.1016/j.jpcs.2003.12.017 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300004 ER PT J AU Jin, HS Lu, DH Armitage, NP Choi, WH Kim, BJ Oh, SJ Moon, SH Eisaki, H Kim, C AF Jin, HS Lu, DH Armitage, NP Choi, WH Kim, BJ Oh, SJ Moon, SH Eisaki, H Kim, C TI Angle resolved photoemission studies on Sm(2-x)Ce(x)CuO4: remnant Fermi surfaces and coupling to (pi,pi) scattering SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL ID HIGH-TEMPERATURE SUPERCONDUCTOR; ELECTRONIC-STRUCTURE; CUPRATE SUPERCONDUCTORS; GAP ANISOTROPY; BI2SR2CACU2O8+DELTA; EVOLUTION AB We report high-resolution angle-resolved photoelectron spectroscopy studies on electron doped superconductors, Sm2-xCexCuO4 (x = 0 and 0.15). The results on the undoped (x = 0) samples show Cu-O anti-bonding states with an overall dispersion of about 0.3 eV which is similar to other insulating cases. The low energy dispersive feature quickly looses intensity before it reaches the Fermi energy near the anti-ferromagnetic zone boundary. showing a remnant behavior of the original Fermi surface (FS). In doped cases (x = 0.15), FS mapping shows suppressed intensities at the Fermi energy where the FS crosses the anti-ferromagnetic zone boundary. This is similar to what was observed on another electron doped superconductor Nd1.85Ce0.15CuO4 which was ascribed being due to the formation of a high-energy pseudogap assisted by Q = (pi, pi) scattering. Similarities and differences in comparison to other compounds are discussed. (C) 2004 Elsevier Ltd. All rights reserved. C1 Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea. Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90210 USA. Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea. Seoul Natl Univ, Ctr Strongly Correlated Mat Res, Seoul 151742, South Korea. Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151742, South Korea. Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan. RP Kim, C (reprint author), Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea. EM cykim@phya.yonsei.ac.kr NR 24 TC 0 Z9 0 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1403 EP 1407 DI 10.1016/j.jpcs.2003.08.049 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300005 ER PT J AU Qiu, XY Billinge, SJL Kmety, CR Mitchell, JF AF Qiu, XY Billinge, SJL Kmety, CR Mitchell, JF TI Evidence for nano-scale inhomogeneities in bilayer manganites in the Mn4+ rich region: 0.54 <= x <= 0.80 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL DE oxides; phase transition; neutron scattering ID LA1-XCAXMNO3; DIFFRACTION; SPIN AB The atomic pair distribution function (PDF) technique is employed to probe the atomic local structural responses in naturally double layered manganites La2-2xSr1+2xMn2O7 in the doping range 0.54 less than or equal to x less than or equal to 0.80. Our low temperature neutron powder diffraction measurements suggest the coexistence of two different Jahn-Teller (JT) distorted MnO6 octahedra when its ordered magnetic structure crosses over from type A (0.54 less than or equal to x less than or equal to 0.66) to type C/C* (0.74 less than or equal to x less than or equal to 0.90) ordering. At all doping levels at low temperature the doped holes reside predominantly in the plane of the bilayer. In the type A magnetic ordering regime, the e(g) electrons appear to be significantly delocalized in the plane resulting in undistorted octahedra, while in type C/C* regime, elongated JT distorted octahedra are apparent. This is consistent with the presence of inhomogeneous coexisting delocalized and localized electronic states. No evidence of macroscopic phase separation has been observed. Such nanoscale inhomogeneities may explain the magnetically frustrated behavior observed in the spin disordered 'gap' region (0.66 less than or equal to x less than or equal to 0.74). (C) 2004 Elsevier Ltd. All rights reserved. C1 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Billinge, SJL (reprint author), Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. EM billinge@pa.msu.edu NR 21 TC 3 Z9 3 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1423 EP 1429 DI 10.1016/j.jpcs.2003.11.040 PG 7 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300008 ER PT J AU Bishop, AR AF Bishop, AR TI Doped transition metal oxides: networks of local distortions correlated by elastic fields SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL DE glasses; metals; oxides; thin films; fermi surface ID HIGH-TEMPERATURE SUPERCONDUCTORS; COMPLEX ELECTRONIC MATERIALS; LONG-RANGE INTERACTIONS; PEIERLS-HUBBARD MODEL; GROUND-STATES; SYSTEMS; EXCITATIONS; CRYSTAL AB We review a perspective of doped transition metal oxides as correlated electron materials governed by functional multiscale complexity. We emphasize several themes: the prevalence of intrinsic complexity realized in the coexistence or competition among broken-symmetry ground states: the origin of landscapes of spatio-temporal patterns in coupled spin, charge and lattice (orbital) degrees-of-freedom; the relevance of co-existing short- and long-range forces; and the importance of multiscale complexity for key materials properties, including multifunctional 'ectro-elastic' materials. (C) 2004 Elsevier Ltd. All rights reserved. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM arb@lanl.gov NR 54 TC 6 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1449 EP 1454 DI 10.1016/j.jpcs.2003.07.002 PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300012 ER PT J AU Pasternak, MP Xu, WM Rozenberg, GK Taylor, RD Jeanloz, R AF Pasternak, MP Xu, WM Rozenberg, GK Taylor, RD Jeanloz, R TI Pressure-induced coordination crossover in magnetite, a high pressure Mossbauer study SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL DE X-ray diffraction; high pressure; Mossbauer spectroscopy ID VERWEY TRANSITION; FE3O4; GAP AB Temperature-dependent Fe-57 Mossbauer spectroscopy to 40 GPa shows that Fe3O4 magnetite undergoes a coordination crossover (CC) whereby charge-density is shifted from octahedral to tetrahedral sites and the spinel structure thus changes from inverse to normal with increasing pressure and decreasing temperature. A precursor to the CC is a d-charge decoupling within the octahedral sites at the inverse spinel phase. The CC-transition takes place almost exactly at the Verwey transition temperature (T-V = 122 K) at ambient pressure. While T-V decreases with pressure, the CC-transition temperature increases with pressure, reaching 350 K at 10 GPa. The d electron localization mechanism proposed by Verwey and later by Mott for T < T-V is shown to be unrelated to the actual mechanism of the metal-insulator transition attributed to the Verwey transition. It is proposed that a first-order phase transition taking place at similar to T-V at ambient pressure opens a small gap within the oxygen p-band, resulting in the observed insulating state at T > T-V. (C) 2004 Elsevier Ltd. All rights reserved. C1 Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA. RP Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel. EM hh136@post.tau.ac.il NR 25 TC 16 Z9 17 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1531 EP 1535 DI 10.1016/j.jpcs.2003.12.013 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300023 ER PT J AU Prakapenka, VP Shen, GY Dubrovinsky, LS Rivers, ML Sutton, SR AF Prakapenka, VP Shen, GY Dubrovinsky, LS Rivers, ML Sutton, SR TI High pressure induced phase transformation of SiO2 and GeO2: difference and similarity SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL DE X-ray diffraction; high pressure ID HIGH-TEMPERATURE POLYMORPHISM; LOWER-MANTLE PRESSURES; X-RAY MEASUREMENTS; INDUCED AMORPHIZATION; MOLECULAR-DYNAMICS; RUTILE-TYPE; STISHOVITE; SILICA; CRISTOBALITE; CACL2-TYPE AB We report high pressure polymorphism of SiO2 and GeO2 at room and high temperatures. It was found that kinetics has a large effect on pressure induced phase transitions of SiO2 and GeO2 The high pressure behavior of SiO2 and GeO2 polymorphs depends on the starting material and pressure-temperature history. Our studies show that SiO2 and GeO2 have a common sequence of high pressure, high temperature structural transformations when the same type of starting material (amorphous or a-quartz) was used: (amorphous or alpha-quartz) double right arrow d-NiAs double right arrow rutile double right arrow CaCl2 double right arrow alpha-PbO2 double right arrow pyrite (Pa-3) types. In the case of cristobalite as starting material, the alpha-PbO2-type phase can be synthesized directly from the high pressure room temperature phase omitting rutile- or CaCl2-type structure. The crystallization of the d-NiAs phase in a narrow temperature interval 1000-1300 K can be used as an indicator of presence of a cation disordered network in both SiO2 and GeO2 materials at high pressure before heating. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA. Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany. RP Univ Chicago, Argonne Natl Lab, Bldg 434A,9700 S Cass Ave, Argonne, IL 60439 USA. EM prakapenka@cars.uchicago.edu RI Shen, Guoyin/D-6527-2011 NR 37 TC 69 Z9 71 U1 3 U2 32 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1537 EP 1545 DI 10.1016/j.jpcs.2003.12.019 PG 9 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300024 ER PT J AU Burakovsky, L Preston, DL AF Burakovsky, L Preston, DL TI Analytic model of the Gruneisen parameter all densities SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on the Study of Matter at Extreme Conditions (SMEC 2003) CY MAR 24-27, 2003 CL Miami Beach, FL ID EQUATION-OF-STATE; HIGH-PRESSURE; MELTING CURVE; LOWER MANTLE; LAW; TEMPERATURE; ALUMINUM; SOLIDS; ANHARMONICITY; DEPENDENCE AB We model the density dependence of the Gruneisen parameter as gamma(rho) = 1/2 + gamma(1)/rho(1/3) + gamma(2)/rho(q), where gamma(1), gamma(2), and q > I are constants. This form is based on the assumption that gamma is an analytic function of V(1/3), and was designed to accurately represent the experimentally determined low-pressure behavior of gamma. The numerical values of the constants are obtained for 20 elemental solids. Using the Lindemann criterion with our model for gamma, we calculate melting curves for Al, Ar, Cu, Pd, and Pt and compare them to available experimental and theoretical melt data. We also determine the Z (atomic number) dependence of gamma(1). The high-compression limit of the model is shown to follow from a generalization of the Slater, Dugdale-MacDonald, and Vashchenko-Zubarevforms for the volume dependence of the Grueisen parameter. (C) 2004 Elsevier Ltd. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Burakovsky, L (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM dean@lanl.gov NR 54 TC 77 Z9 81 U1 3 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG-SEP PY 2004 VL 65 IS 8-9 SI SI BP 1581 EP 1587 DI 10.1016/j.jpcs.2003.10.076 PG 7 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 838QF UT WOS:000222727300030 ER PT J AU Bass, SA Muller, B Srivastava, DK AF Bass, SA Muller, B Srivastava, DK TI RHIC physics with the parton cascade model SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID COLLISIONS; EVOLUTION; COHERENT; QCD AB We present an analysis of the net baryon number rapidity distribution and of direct photon emission in the framework of the parton cascade model. C1 Duke Univ, Dept Phys, Durham, NC 27708 USA. Brookhaven Natl Lab, RIKEN, BNL, Res Ctr, Upton, NY 11973 USA. Variable Energy Cyclotron Ctr, Kolkata 700064, W Bengal, India. RP Bass, SA (reprint author), Duke Univ, Dept Phys, Durham, NC 27708 USA. EM bass@phy.duke.edu OI Bass, Steffen/0000-0002-9451-0954 NR 19 TC 8 Z9 8 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1283 EP S1286 AR PII s0954-3899(04)77466-6 DI 10.1088/0954-3899/30/8/109 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800110 ER PT J AU Blyth, SL AF Blyth, SL CA ALICE-USE Collaboration TI Jet study in ultra-relativistic heavy-ion collisions with the ALICE detector at the LHC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB First results of jet reconstruction in simulated Pb + Pb collisions with the ALICE detector at LHC at rootS(NN) = 5.5 TeV, using a combination of tracking and calorimetric information, are presented. It is demonstrated that changes in jet fragmentation functions, caused by jet energy loss in a dense medium, and modelled in simulations, are measurable. C1 Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa. Lawrence Bekeley Natl Lab, Berkeley, CA 94720 USA. RP Blyth, SL (reprint author), Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa. EM slblyth@lbl.gov RI Barbera, Roberto/G-5805-2012 OI Barbera, Roberto/0000-0001-5971-6415 NR 13 TC 5 Z9 5 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1155 EP S1158 AR PII S0954-3899(04)77730-0 DI 10.1088/0945-3899/30/8/079 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800080 ER PT J AU Brooks, M AF Brooks, M TI J/psi and open charm production SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID CROSS-SECTIONS; COLLISIONS; POLARIZATION; SUPPRESSION; NUCLEON; GEV/C; TEV AB An overview of J/psi and open charm production is presented, concentrating primarily on experimental results that have come out over the past few years. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Brooks, M (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM mbrooks@lanl.gov NR 23 TC 3 Z9 3 U1 2 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S861 EP S870 AR PII S0954-3899(04)77674-4 DI 10.1088/0954-3899/30/8/027 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800028 ER PT J AU Castillo, J AF Castillo, J CA STAR Collaboration TI Elliptic flow of multistrange baryons Xi and Omega in Au+Au collisions at root(s)(NN)=200 GeV SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB The first measurement of the elliptic transverse flow for multistrange baryons Xi and Omega in high-energy heavy-ion collisions is presented, which may indicate the presence of partonic collectivity. A hydrodynamically inspired model fit to the transverse momentum spectra and the elliptic flow of Xi(-) and (&UXi;) over bar (+) indicates that these particles might be emitted from the system at a high temperature (similar to150 MeV) with a significant radial transverse flow and that the emitting system is spatially asymmetric. C1 Lawrence Berkeley Natl Univ, Berkeley, CA 94720 USA. RP Castillo, J (reprint author), Lawrence Berkeley Natl Univ, Berkeley, CA 94720 USA. EM JECastillo@lbl.gov NR 15 TC 22 Z9 22 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1207 EP S1211 AR PII S0954-3899(04)77836-6 DI 10.1088/0954-3899/30/8/091 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800092 ER PT J AU Datta, S Karsch, F Petreczky, P Wetzorke, I AF Datta, S Karsch, F Petreczky, P Wetzorke, I TI Charmonium systems after the deconfinement transition SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB The behaviour of charmonia after the deconfinement transition is investigated on quenched lattices. Analysis of temporal correlators on fine lattices at temperatures up to 3 T-c show that the J/psi and eta(c) survive the deconfinement transition with little significant changes, and survive as bound states at least up to 2.25 T-c. The spatially excited chi(ci) states suffer serious system modifications, and perhaps dissolution, already a little above T-c. C1 Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. DESY Zeuthen, NIC, D-15738 Zeuthen, Germany. RP Datta, S (reprint author), Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany. NR 9 TC 23 Z9 23 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1347 EP S1350 AR PII S0954-3899(04)77716-6 DI 10.1088/0954-3899/30/8/124 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800125 ER PT J AU Debbe, R AF Debbe, R CA BRAHMS Collaboration TI High p(T) hadron spectra at high rapidity SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID GLUON DISTRIBUTION-FUNCTIONS; WEIZSACKER-WILLIAMS FIELD; COLOR GLASS CONDENSATE; LOW-X; TRANSVERSE-MOMENTUM; LARGE NUCLEUS; LOW Q(2); CROSS-SECTION; PLUS AU; COLLISIONS AB We report the measurement of charged hadron production at different pseudorapidity values in deuteron+gold as well as proton-proton collisions at roots(NN) = 200 GeV at RHIC. The nuclear modification factors R-dAu and R-cp are used to investigate new behaviours in the deuteron+gold system as a function of rapidity and the centrality of the collisions, respectively. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Debbe, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 38 TC 23 Z9 23 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S759 EP S765 AR PII s0954-3899(04)77662-8 DI 10.1088/0954-3899/30/8/015 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800016 ER PT J AU Eskola, KJ Kolhinen, VJ Vogt, R AF Eskola, KJ Kolhinen, VJ Vogt, R TI Enhanced charm hadroproduction due to nonlinear corrections to the DGLAP equations SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID DEEP-INELASTIC-SCATTERING; PERTURBATION-THEORY; EP SCATTERING AB We have studied the effects of nonlinear scale evolution of the parton distribution functions to charm production in pp collisions at centre-of-mass energies of 5.5, 8.8 and 14 TeV. We find that the differential charm cross section can be enhanced up to a factor of 4-5 at low p(T). The enhancement is quite sensitive to the charm quark mass and the renormalization/factorization scales. C1 Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland. Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. RP Eskola, KJ (reprint author), Univ Jyvaskyla, Dept Phys, POB 35, FIN-40014 Jyvaskyla, Finland. EM vesa.kolhinen@phys.jyu.fi NR 19 TC 5 Z9 5 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1171 EP S1174 AR PII S0954-3899(04)77620-3 DI 10.1088/0954-3899/30/8/083 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800084 ER PT J AU Fachini, P AF Fachini, P TI Resonance production SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID VECTOR-MESON PRODUCTION; 205 GEV-C; INCLUSIVE PRODUCTION; PP COLLISIONS; ROOT-S(NN)=200 GEV; HADRON-PRODUCTION; K&P INTERACTIONS; DECAYS; K-ASTERISK(892); ANNIHILATION AB Recent results on rho(770)(0), K(892)(*0), f(0)(980), phi(1020), Delta(1232)(++) and A (1520) production in A+A and p+p collisions at SPS and RHIC energies are presented. These resonances are measured via their hadronic decay channels and used as a sensitive tool to examine the collision dynamics in the hadronic medium through their decay and regeneration. The modification of resonance mass, width and shape due to phase space and dynamical effects are discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fachini, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM pfachini@bnl.gov NR 50 TC 22 Z9 22 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S735 EP S741 AR PII s0954-3899(04)77754-3 DI 10.1088/0954-3899/30/8/012 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800013 ER PT J AU Filimonov, K AF Filimonov, K TI Jets as a probe of dense matter at RHIC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB Jet quenching in the matter created in high-energy nucleus-nucleus collisions provides a tomographic tool to probe the medium properties. Recent experimental results on jet production at the Relativistic Heavy-Ion Collider (RHIC) are reviewed. Jet properties in p+p and d+Au collisions have been measured, establishing the baseline for studying jet modification in heavy-ion collisions. Current progress on detailed studies of high transverse momentum production in Au+Au collisions is discussed, with an emphasis on dihadron correlation measurements. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Filimonov, K (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM KVFilimonov@lbl.gov NR 42 TC 12 Z9 12 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S919 EP S926 AR PII S0954-3899(04)78531-X DI 10.1088/0954-3899/30/8/034 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800035 ER PT J AU Gale, C Awes, TC Fries, RJ Srivastava, DK AF Gale, C Awes, TC Fries, RJ Srivastava, DK TI The electromagnetic signature of jets SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID HEAVY-ION COLLISIONS; PHOTON; RATES AB Recent RHIC data have suggested an interesting scenario where jets, after being formed in the very first instants of the nuclear collision, interact strongly and are absorbed by the hot and dense matter subsequently created. In this respect, electromagnetic signals constitute another class of penetrating radiation. We first propose the study of large mass dileptons induced by the passage of high-energy quark jets through quark-gluon plasma. We find that the yield due to the jet-plasma interaction gets progressively larger as the collision energy increases: it is slightly less than the Drell-Yan contribution at RHIC energies, and it is a factor of 10 larger than Drell-Yan at the LHC. In a related investigation, we then propose to study dilepton-tagged jets. We estimate quantitatively the various background sources, and identify windows where those are sub-dominant. C1 McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. Ctr Variable Energy Cyclotron, Kolkata 700064, W Bengal, India. RP Gale, C (reprint author), McGill Univ, Dept Phys, 3600 Univ St, Montreal, PQ H3A 2T8, Canada. NR 9 TC 9 Z9 9 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1013 EP S1016 AR PII S0954-3899(04)77950-5 DI 10.1088/0954-3899/30/8/049 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800050 ER PT J AU Gelis, F Venugopalan, R AF Gelis, F Venugopalan, R TI Initial state effects in the colour glass condensate SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID GLUON DISTRIBUTION-FUNCTIONS; HEAVY-ION COLLISIONS; NUCLEAR COLLISIONS; TRANSVERSE-MOMENTUM; RADIATION; DENSITY AB The colour glass condensate provides a systematic power counting of initial state effects in high energy QCD. We briefly discuss in this framework quark and gluon production in high energy collisions. C1 CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Gelis, F (reprint author), CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. NR 24 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S995 EP S998 AR PII S0954-3899(04)78172-4 DI 10.1088/0954-3899/30/8/045 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800046 ER PT J AU Grandchamp, L Rapp, R Brown, GE AF Grandchamp, L Rapp, R Brown, GE TI Medium modifications of charm and charmonium in high-energy heavy-ion collisions SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID SUPPRESSION; TRANSITION AB The production of charmonia in heavy-ion collisions is investigated within a kinetic theory framework simultaneously accounting for dissociation and regeneration processes in both quark-gluon plasma (QGP) and hadron-gas phases of the reaction. In-medium modifications of open-charm states (c-quarks, D-mesons) and the survival of J/psi mesons in the QGP are included as inferred from lattice QCD. Pertinent consequences on equilibrium charmonium abundances. are evaluated and found to be especially relevant to explain the measured centrality dependence of the psi'/psi ratio at SPS. Predictions for recent In-In experiments, as well as comparisons to current Au-Au data from RHIC, are provided. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA. Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA. SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA. RP Grandchamp, L (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM LGrandchamp@lbl.gov; rapp@comp.tamu.edu NR 16 TC 13 Z9 13 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1355 EP S1358 AR PII S0954-3899(04)78324-3 DI 10.1088/0954-3899/30/8/126 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800127 ER PT J AU Heffner, M AF Heffner, M CA PHENIX Collaboration TI Two-particle interferometry of 200 GeV Au+Au collisions at PHENIX SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID QUARK-GLUON PLASMA AB The PHENIX experiment has measured pion-pion, kaon-kaon and proton-proton correlations in Au+Au collisions at rootS(NN) = 200 GeV. The correlations are fit to extract radii using both the Bowler [1] Coulomb correction and full calculation of the two-particle wavefunction. The resulting radii are similar for all three species and decrease with increasing k(t) as expected for collective flow. The R-out and R-side radii are approximately equal indicating a short emission duration. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Heffner, M (reprint author), Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94550 USA. NR 10 TC 10 Z9 11 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1043 EP S1047 AR PII S0954-3899(04)77854-8 DI 10.1088/0954-3899/30/8/055 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800056 ER PT J AU Hirano, T Nara, Y AF Hirano, T Nara, Y TI CGC, hydrodynamics and the parton energy loss SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID GLUON DISTRIBUTION-FUNCTIONS; COLOR GLASS CONDENSATE; HIGH-DENSITY QCD; ELLIPTIC FLOW; LARGE NUCLEI; COLLISIONS AB Hadron spectra in Au+Au collisions at RHIC are calculated by hydrodynamics with initial conditions from the colour glass condensate (CGC). Minijet components with parton energy loss in medium are also taken into account by using parton density obtained from hydrodynamical simulations. We found that CGC provides a good initial condition for hydrodynamics in Au+Au collisions at RHIC. C1 Brookhaven Natl Lab, Res Ctr, RIKEN, Upton, NY 11973 USA. Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. RP Hirano, T (reprint author), Brookhaven Natl Lab, Res Ctr, RIKEN, Upton, NY 11973 USA. NR 45 TC 13 Z9 13 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1139 EP S1142 AR PII S0954-3899(04)77867-6 DI 10.1088/0954-3899/30/8/076 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800077 ER PT J AU Hirano, T AF Hirano, T TI Hydrodynamic models SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; ABELIAN ENERGY-LOSS; ELLIPTIC FLOW; NUCLEAR COLLISIONS; ANISOTROPIC FLOW; EQUILIBRATION; EXPANSION; LHC; HOT AB Recent developments based on relativistic hydrodynamic models in high energy heavy ion collisions are discussed. I focus especially on how hydrodynamics works at RHIC energies and how one can use the most of it in the analyses of jet quenching and thermal electromagnetic radiations. I also comment on the improvement of initial conditions and viscosity in hydrodynamic models. C1 Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. RP Hirano, T (reprint author), Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. NR 77 TC 24 Z9 24 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S845 EP S851 AR PII s0954-3899(04)77826-3 DI 10.1088/0954-3899/30/8/025 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800026 ER PT J AU Holzman, B Back, BB Baker, MD Ballintijn, M Barton, DS Betts, RR Bickley, AA Bindel, R Budzanowski, A Busza, W Carroll, A Decowski, MP Garcia, E George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Heintzelman, GA Henderson, C Holman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Katzy, J Khan, N Kucewicz, W Kulinich, P Kuo, CM Lin, WT Manly, S McLeod, D Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Remsberg, LP Reuter, M Roland, C Roland, G Rosenberg, L Sagerer, J Sarin, P Sawicki, P Skulski, W Steinberg, P Stephans, GSF Sukhanov, A Tang, JL Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wozniak, K Wuosmaa, AH Wyslouch, B AF Holzman, B Back, BB Baker, MD Ballintijn, M Barton, DS Betts, RR Bickley, AA Bindel, R Budzanowski, A Busza, W Carroll, A Decowski, MP Garcia, E George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Heintzelman, GA Henderson, C Holman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Katzy, J Khan, N Kucewicz, W Kulinich, P Kuo, CM Lin, WT Manly, S McLeod, D Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Remsberg, LP Reuter, M Roland, C Roland, G Rosenberg, L Sagerer, J Sarin, P Sawicki, P Skulski, W Steinberg, P Stephans, GSF Sukhanov, A Tang, JL Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wozniak, K Wuosmaa, AH Wyslouch, B CA PHOBOS Collaboration TI Rapidity and k(T) dependence of HBT correlations in Au+Au collisions at 200 GeV with PHOBOS SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID PLUS AU COLLISIONS; ENERGY AB Two-particle correlations of identical charged pion pairs from Au+Au collisions at rootS(NN) = 200 GeV were measured by the PHOBOS experiment at RHIC. Data for the most central (0-15%) events were analysed with Bertsch-Pratt (BP) and Yano-Koonin-Podgoretskii (YKP) parametrizations using pairs with rapidities of 0.4 < y < 1.3 and transverse momenta 0.1 < k(T) < 1.4 GeV/c. The Bertsch-Pratt radii decrease as a function of pair transverse momentum. The pair rapidity Y-pipi roughly scales with the source rapidity Y-YKP, indicating strong dynamical correlations. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Argonne Natl Lab, Argonne, IL 60439 USA. MIT, Cambridge, MA 02139 USA. Univ Illinois, Chicago, IL 60607 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Rochester, Rochester, NY 14627 USA. Inst Nucl Phys, Krakow, Poland. Natl Cent Univ, Chungli 32054, Taiwan. RP Holzman, B (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM burt@bnl.gov RI Decowski, Patrick/A-4341-2011; Mignerey, Alice/D-6623-2011; OI Holzman, Burt/0000-0001-5235-6314 NR 14 TC 4 Z9 4 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1049 EP S1052 AR PII S0954-3899(04)77848-2 DI 10.1088/0954-3899/30/8/056 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800057 ER PT J AU Kaneta, M AF Kaneta, M CA PHENIX Collaboration TI Event anisotropy of identified pi(0), photon and electron compared to charged pi, K, p and deuteron in root(s)(NN)=200 GeV Au+Au at PHENIX SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB We report the recent results of event anisotropy analysis focused on nu(2) in rootS(NN) = 200 GeV Au+Au collisions at PHENIX. C1 Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. RP Kaneta, M (reprint author), Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. EM kaneta@bnl.gov NR 15 TC 26 Z9 26 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1217 EP S1220 AR PII S0954-3899(04)77723-3 DI 10.1088/0954-3899/30/8/093 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800094 ER PT J AU Liu, MX AF Liu, MX CA PHENIX Collaboration TI Hadron production in the forward and backward rapidities in d-Au collisions at RHIC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB We have developed new techniques to detect hadrons with the PHENIX muon spectrometers. This allows us to study the centrality dependent nuclear modification factor R-CP with high p(T) hadrons in both forward (d direction) and backward (Au direction) pseudo-rapidities, 1 < \eta\ < 2, in d-Au collisions at rootS(NN) = 200 GeV. Preliminary results show a suppression (enhancement) of high PT hadron production in central 0-20% d-Au collisions relative to the peripheral one (60 - 88% in centrality) at forward (backward) rapidity. C1 Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. RP Liu, MX (reprint author), Los Alamos Natl Lab, Div Phys, POB 1663, Los Alamos, NM 87545 USA. OI Liu, Ming/0000-0002-5992-1221 NR 13 TC 9 Z9 9 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1193 EP S1196 AR PII S0954-3899(04)77721-X DI 10.1088/0954-3899/30/8/088 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800089 ER PT J AU Majumder, A AF Majumder, A TI Dihadron fragmentation functions and high p(T) hadron-hadron correlations SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID PARTON ENERGY-LOSS; SCATTERING AB We propose the formulation of a dihadron fragmentation function in terms of parton matrix elements. Under the collinear factorization approximation and facilitated by the cut-vertex technique, the two-hadron inclusive cross section at leading order in e(+)e(-) annihilation is shown to factorize into a short-distance parton cross section and the long-distance dihadron fragmentation function. We also derive the DGLAP evolution equation of this function at leading log. The evolution equation for the non-singlet quark fragmentation function is solved numerically with a simple ansatz for the initial condition and results are presented for cases of physical interest. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Majumder, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1305 EP S1308 AR PII s0954-3899(04)78791-5 DI 10.1088/0954-3899/30/8/114 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800115 ER PT J AU Mitchell, JT AF Mitchell, JT TI An overview of fluctuation and correlation results in relativistic heavy-ion collisions SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB A great deal of recent data on event-by-event fluctuation and correlation measurements have been released by several experiments at the SPS and RHIC. Recent results on charge fluctuations, balance functions in pseudorapidity and average transverse momentum fluctuations will be reviewed. The results will be compared to various model predictions after examining contributions to each observable from known physics processes. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Mitchell, JT (reprint author), Brookhaven Natl Lab, Dept Phys, Bldg 510C, Upton, NY 11973 USA. NR 24 TC 21 Z9 21 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S819 EP S825 AR PII s0954-3899(04)78424-8 DI 10.1088/1954-3899/30/8/022 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800023 ER PT J AU Nouicer, R Back, BB Baker, MD Ballintijn, M Barton, DS Becker, B Betts, RR Bickley, AA Bindel, R Busza, W Carroll, A Decowski, MP Garcia, E Gburek, T George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Harrington, AS Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Khan, N Kulinich, P Kuo, CM Lee, JW Lin, WT Manly, S Mignerey, AC Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Roland, C Roland, G Sagerer, J Sarin, P Sedykh, I Skulski, W Smith, CE Steinberg, P Stephans, GSF Sukhanov, A Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Veres, GI Wolfs, FLH Wosiek, B Wozniak, K Wyslouch, B Zhang, J AF Nouicer, R Back, BB Baker, MD Ballintijn, M Barton, DS Becker, B Betts, RR Bickley, AA Bindel, R Busza, W Carroll, A Decowski, MP Garcia, E Gburek, T George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Harrington, AS Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Khan, N Kulinich, P Kuo, CM Lee, JW Lin, WT Manly, S Mignerey, AC Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Roland, C Roland, G Sagerer, J Sarin, P Sedykh, I Skulski, W Smith, CE Steinberg, P Stephans, GSF Sukhanov, A Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Veres, GI Wolfs, FLH Wosiek, B Wozniak, K Wyslouch, B Zhang, J CA PHOBOS Collaboration TI Pseudorapidity distributions of charged particles in d+Au and p+p collisions at root s(NN)=200 GeV SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID HIGH-DENSITY QCD; ENERGIES AB The measured pseudorapidity distributions of primary charged particles are presented for d+Au and p+p collisions at rootS(NN) = 200 GeV over a wide pseudorapidity range of \eta\ less than or equal to 5.4. The results for d+Au collisions are presented for minimum-bias events and as a function of collision centrality. The measurements for p+p collisions are shown for minimum-bias events. The ratio of the charged particle multiplicity in d+Au and p+A collisions relative to that for inelastic p+p collisions is found to depend only on , and it is remarkably independent of collision energy and system mass. The deuteron and gold fragmentation regions in d+Au collisions are in good agreement with proton nucleus data at lower energies. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Illinois, Chicago, IL 60607 USA. Argonne Natl Lab, Argonne, IL 60439 USA. MIT, Cambridge, MA 02139 USA. Univ Maryland, College Pk, MD 20742 USA. Inst Phys Nucl, Krakow, Poland. Univ Rochester, Rochester, NY 14627 USA. Natl Cent Univ, Chungli 32054, Taiwan. RP Brookhaven Natl Lab, Bldg 555,POB 5000, Upton, NY 11973 USA. EM rachid.nouicer@bnl.gov RI Decowski, Patrick/A-4341-2011; Mignerey, Alice/D-6623-2011 NR 9 TC 28 Z9 28 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1133 EP S1137 AR PII S0954-3899(04)77862-7 DI 10.1088/0954-3899/30/8/075 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800076 ER PT J AU Petreczky, P AF Petreczky, P TI The finite temperature transition in (2+1)-flavour QCD with staggered HYP action SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID PHASE-TRANSITION; LATTICE QCD; QUARKS; FLAVORS; FERMIONS AB We study the finite temperature transition in (2+1)-flavour QCD using N-tau = 4 and 6 lattices with HYP staggered action for different values of the quark masses, including the physical one. We determine the transition temperature in the chiral limit, which turns out to be T-C = (188 +/- 11) MeV for N-tau = 4 and T-C = (177 +/- 7) MeV for N-tau = 6. For the physical quark (pion) mass the transition is likely to be a crossover which happens roughly at the transition temperature of the chiral limit. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Petreczky, P (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 23 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1259 EP S1262 AR PII S0954-3899(04)79017-9 DI 10.1088/0954-3899/30/8/103 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800104 ER PT J AU Pinkenburg, C AF Pinkenburg, C CA PHENIX Collaboration TI Search for the (Theta)over-bar(-) -> K-(n)over-bar with PHENIX SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID POSITIVE-STRANGENESS; PHOTOPRODUCTION; DETECTOR; BARYON AB The PHENIX experiment at RHIC should be sensitive to decays of the antipentaquark (&UTheta;) over bar via the K-(n) over bar channel. Charged kaons can be identified using the standard tracking and time of flight up to a momentum of 1.5 GeV/c. Anti-neutron candidates are detected via their annihilation signal in the highly segmented electromagnetic calorimeter (EMCal). In order to assess the quality of the anti-neutron identification, we reconstruct the (&USigma;) over bar --> (n) over bar pi. As an additional cross-check, the invariant mass of K+(n) over bar is reconstructed where no resonance in the pentaquark mass range is expected. At present, no enhancement at the expected pentaquark mass is observed in dAu collisions at rootS(SS) = 200 GeV. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Pinkenburg, C (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM pinkenburg@bnl.gov NR 16 TC 53 Z9 54 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1201 EP S1205 AR PII S0954-3899(04)77844-5 DI 10.1088/0954-3899/30/8/090 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800091 ER PT J AU Poskanzer, AM AF Poskanzer, AM CA STAR Collaboration TI Azimuthal anisotropy: the higher harmonics SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID COLLISIONS; FLOW AB We report the first observation of the fourth harmonic (nu(4)) in the azimuthal distribution of particles at RHIC. The measurement was done taking advantage of the large elliptic flow generated at RHIC. The integrated nu(4) is about a factor of 10 smaller than nu(2). For the sixth (nu(6)) and eighth (nu(8)) harmonics upper limits on the magnitudes are reported. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Poskanzer, AM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, MS70R319, Berkeley, CA 94720 USA. EM AMPoskanzer@LBL.gov NR 9 TC 9 Z9 9 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1225 EP S1228 AR PII S0954-3899(04)77675-6 DI 10.1088/0954-3899/30/8/095 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800096 ER PT J AU Raufeisen, J AF Raufeisen, J TI Heavy quark production and gluon shadowing at RHIC and LHC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID FLAVOR PRODUCTION; HADRONIC COLLISIONS; CROSS-SECTION; NUCLEI; COHERENCE; DIS AB review the colour dipole formulation of heavy quark production in the light of recent RHIC data. Since charm and bottom production directly probe the gluon density, these processes allow one to study shadowing and parton saturation at RHIC and LHC. The dipole approach provides a convenient framework to calculate these nuclear effects. I present numerical results for open charm and bottom production in proton-proton and proton-nucleus collisions and discuss transverse momentum broadening of heavy quarkonia. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Raufeisen, J (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. EM jorg@slac.stanford.edu NR 21 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1159 EP S1162 AR PII S0954-3899(04)77668-9 DI 10.1088/0954-3899/30/8/080 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800081 ER PT J AU Reddy, S AF Reddy, S TI Neutron stars, supernova and phases of dense quark matter SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID RX J185635-3754; MASS; SUPERCONDUCTIVITY; QCD AB We present a brief discussion on the possible role of quark matter in 'neutron' stars. Observable aspects of neutron star structure and early evolution of the newly born neutron star are discussed in this context. The phase structure of dense quark matter and its impact on the equation of state and transport properties of dense matter are highlighted. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, Div Theoret, POB 1663, Los Alamos, NM 87545 USA. EM reddy@lanl.gov NR 31 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S879 EP S885 AR PII S0954-3899(04)78785-X DI 10.1088/0954-3899/30/8/029 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800030 ER PT J AU Retiere, F AF Retiere, F TI Flow in ultra-relativistic heavy-ion collisions SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB Flow develops in ultra-relativistic heavy-ion collisions via re-interactions among partons or/and hadrons. Characterizing flow is a crucial step towards understanding the formation of partonic matter. We review new measurements on anisotropic flow, including v(2) at large rapidity, v(1), v(4), and new ways of addressing non-flow issues. We then show the self-consistency of the data and characterize flow of pions, kaons, protons and Xi within the blast wave parametrization. Finally, we show that the data currently available suggest that flow develops at both partonic and hadronic stages. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Retiere, F (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM fgretiere@lbl.gov NR 28 TC 18 Z9 18 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S827 EP S834 AR PII s0954-3899(04)78788-5 DI 10.1088/0954-3899/30/8/023 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800024 ER PT J AU Ruan, LJ AF Ruan, LJ CA STAR Collaboration TI Open charm yields in 200 GeV p+p and d+Au collisions at RHIC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID RESISTIVE PLATE CHAMBERS; PAIRS; SPS; PP AB Open charm spectra at mid-rapidity from direct reconstruction of D-0 --> Kpi and indirect electron/positron measurements via charm semileptonic decay in p+p and d+Au collisions at rootS(NN) = 200 GeV are reported. The combined spectra cover open charm transverse momentum range 0.1 less than or similar to p(T) less than or similar to 6 GeV/c. The electron spectra show approximate binary scaling between p+p and d+Au collisions. From these two independent analyses, the differential cross section per nucleon-nucleon interaction at mid-rapidity for open charm production at RHIC is dsigmac (c) over bar (NN)/dy = 0.31 +/- 0.04 (stat) +/- 0.08 (syst) mb. The next-to-leading-order pQCD calculation underpredicts the charm yields. C1 Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ruan, LJ (reprint author), Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China. EM rlj@mail.ustc.edu.cn NR 20 TC 9 Z9 10 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1197 EP S1200 AR PII S0954-3899(04)77851-2 DI 10.1088/0954-3899/30/8/089 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800090 ER PT J AU Schweda, K AF Schweda, K CA STAR Collaboration TI Highlights from STAR SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID AU+AU COLLISIONS; D+AU COLLISIONS; AZIMUTHAL ANISOTROPY; ROOT(S)(NN)=200 GEV; ELLIPTIC FLOW; P+P AB Selected results from the STAR collaboration are presented. We focus on recent results on jet-like correlations, nuclear modification factors of identified hadrons, elliptic flow of multi-strange baryons Xi and Omega, and resonance yields. First measurements of open charm production at RHIC are presented. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Schweda, K (reprint author), Lawrence Berkeley Natl Lab, 1 Cyclotron Rd,MS70R0319, Berkeley, CA 94720 USA. EM koschweda@lbl.gov NR 39 TC 20 Z9 20 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S693 EP S700 AR PII s0954-3899(04)77849-4 DI 10.1088/0954-3899/30/8/007 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800008 ER PT J AU Steinberg, P AF Steinberg, P CA PHOBOS Collaboration TI The landscape of particle production: results from PHOBOS SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB Recent results from the PHOBOS experiment at RHIC are presented, both from Au+Au collisions from the 2001 run and p+p and d+Au collisions from 2003. The centrality dependence of the total charged-particle multiplicity in p+p and d+Au shows features, such as N-part scaling and limiting fragmentation, similar to p+A collisions at lower energies. Multiparticle physics in Au+Au is found to be local in (pseudo)rapidity, both when observed by HBT correlations and by forward-backward pseudorapidity correlations. The shape of elliptic flow in Au+Au, measured over the full range of pseudorapidity, appears to have a very weak centrality dependence. Identified particle ratios in d+Au reactions show little difference between the shape of proton and anti-proton spectra, while the absolute yields show an approximate m(T) scaling. Finally, results on R-dAu as a function of pseudorapidity show that this ratio decreases monotonically with eta, even between 0.2 < q < 1.4. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Argonne Natl Lab, Argonne, IL 60439 USA. MIT, Cambridge, MA 02139 USA. Univ Illinois, Chicago, IL 60607 USA. Univ Maryland, College Pk, MD 20742 USA. Inst Nucl Phys, Krakow, Poland. Univ Rochester, Rochester, NY 14627 USA. Natl Cent Univ, Chungli 32054, Taiwan. RP Steinberg, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. OI Holzman, Burt/0000-0001-5235-6314 NR 18 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S683 EP S691 AR PII s0954-3899(04)79375-5 DI 10.1088/0954-3899/30/8/006 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800007 ER PT J AU Takai, H AF Takai, H CA ATLAS Collaboration TI Heavy ion physics with the ATLAS detector SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB The large hadron collider is planning to accelerate heavy nuclei such as lead at energies of 2.75 TeV/nucleon. At these energies it will be possible to produce QCD matter at densities greater than 30 GeV fm(-3). The hard scattering cross sections will increase significantly and they could be used as probes of the hot QCD matter. RHIC experiments indicate that hard scattered partons produced within the quark-gluon plasma radiate gluons and therefore the associated jet properties are expected to be modified. The ATLAS detector with its large acceptance is ideally suited to detect and study jets from nucleus-nucleus collisions. Initial simulation studies show that most of the ATLAS detector will perform well in a high multiplicity environment, including the inner tracker. Jet reconstruction is possible with an energy resolution close to expected for the high luminosity proton-proton runs. We present a short summary of our initial round of simulations of the ATLAS detector in the heavy ion environment. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Takai, H (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM takai@bnl.gov RI Takai, Helio/C-3301-2012 OI Takai, Helio/0000-0001-9253-8307 NR 8 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1105 EP S1108 AR PII S0954-3899(04)77764-6 DI 10.1088/0954-3899/30/8/068 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800069 ER PT J AU Tang, AH AF Tang, AH CA STAR Collaboration TI Azimuthal anisotropy and correlations in p+p, d+Au and Au+Au collisions at 200 GeV SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID HEAVY-ION COLLISIONS; FLOW AB We present the first measurement of directed flow (nu(1)) at RHIC. nu(1) is found to be consistent with zero at pseudorapidities eta from -1.2 to 1.2, then rises to the level of a couple of per cent over the range 2.4 < \eta\ < 4. The latter observation is similar to data from NA49 if the SPS rapidities are shifted by the difference in beam rapidity between RHIC and SPS. Back-to-back jets emitted out-of-plane are found to be more suppressed if compared to those emitted in-plane, which is consistent with jet quenching. Using the scalar product method, we systematically compared azimuthal correlations from p+p, d+Au and Au+Au collisions. Flow and non-flow from these three different collision systems are discussed. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Tang, AH (reprint author), Brookhaven Natl Lab, Dept Phys, POB 5000, Upton, NY 11973 USA. EM aihong@bnl.gov NR 14 TC 16 Z9 16 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1235 EP S1238 AR PII S0954-3899(04)77632-X DI 10.1088/0954-3899/30/8/097 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800098 ER PT J AU Tannenbaum, MJ AF Tannenbaum, MJ CA PHENIX Collaboration TI Event-by-event average p(T) fluctuations in root s(NN)=200 GeVAu+Au and p plus p collisions in PHENIX: measurements and jet contribution simulations SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB Small, but significant non-random fluctuations in event-by-event average PT have been observed in Au+Au collisions at rootS(NN) = 200 GeV by the PHENIX Collaboration. These are consistent with being caused by correlations due to jets at large P-T, where the measured suppression must be included to reproduce the centrality dependence of the non-random fluctuations. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Tannenbaum, MJ (reprint author), Brookhaven Natl Lab, Dept Phys, 510C, Upton, NY 11973 USA. OI Tannenbaum, Michael/0000-0002-8840-5314 NR 5 TC 7 Z9 7 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1367 EP S1370 AR PII S0954-3899(04)77860-3 DI 10.1088/0954-3899/30/8/129 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800130 ER PT J AU Teaney, DA AF Teaney, DA TI Viscosity and thermalization SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID ELLIPTIC FLOW; TRANSPORT; FLUIDS AB I solve the relativistic Navier stokes equations assuming boost invariance and rotational symmetry. I compare the resulting numerical solutions for two limiting models of the shear viscosity. In the first model the shear viscosity is made proportional to the temperature. Thus, eta proportional to T/sigma(0) where sigma(0) is some fixed cross section (perhaps sigma(0) similar to Lambda(QCD)(-2)). This viscosity model is typical of the classical Boltzmann simulations of Gyulassy and Molnar. In the second model the shear viscosity is made proportional to T-3. This model is typical of high temperature QCD. When the initial mean free path of the T-3 model is four times larger than the T/sigma(0) model, the two models of viscosity produce the same radial flow. This result can be understood with simple scaling arguments. Thus, the large transport opacity needed in classical Boltzmann simulations is in part an artefact of the fixed scale sigma(0) in these models. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Teaney, DA (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM dteaney@quark.phy.bnl.gov NR 11 TC 41 Z9 41 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1247 EP S1250 AR PII S0954-3899(04)77834-2 DI 10.1088/0954-3899/30/8/100 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800101 ER PT J AU Tonjes, MB Back, BB Baker, MD Ballintijn, M Barton, DS Betts, RR Bickley, AA Bindel, R Budzanowski, A Busza, W Carrol, A Decowski, MP Garcia, E George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Heintzelman, GA Henderson, C Holman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Katzy, J Khan, N Kucewicz, W Kulinich, P Kuo, CM Lin, WT Manly, S McLeod, D Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Remsberg, LP Reuter, M Roland, C Roland, G Rosenberg, L Sagerer, J Sarin, P Sawicki, P Skulski, W Steinberg, P Stephans, GSF Sukhanov, A Tang, JL Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wozniak, K Wuosmaa, AH Wyslouch, B AF Tonjes, MB Back, BB Baker, MD Ballintijn, M Barton, DS Betts, RR Bickley, AA Bindel, R Budzanowski, A Busza, W Carrol, A Decowski, MP Garcia, E George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Heintzelman, GA Henderson, C Holman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Katzy, J Khan, N Kucewicz, W Kulinich, P Kuo, CM Lin, WT Manly, S McLeod, D Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Remsberg, LP Reuter, M Roland, C Roland, G Rosenberg, L Sagerer, J Sarin, P Sawicki, P Skulski, W Steinberg, P Stephans, GSF Sukhanov, A Tang, JL Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wozniak, K Wuosmaa, AH Wyslouch, B CA PHOBOS Collaboration TI Flow in Au plus Au collisions at RHIC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB The study of flow can provide information on the initial state dynamics and the degree of equilibration attained in heavy-ion collisions. This contribution presents results for both elliptic and directed flow as determined from data recorded by the PHOBOS experiment in Au+Au runs at RHIC at rootS(NN) 19.6, 130 and 200 GeV The PHOBOS detector provides a unique coverage in pseudorapidity for measuring flow at RHIC. The systematic dependence of flow on pseudorapidity, transverse momentum, centrality and energy is discussed. C1 Univ Maryland, College Pk, MD 20742 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. MIT, Cambridge, MA 02139 USA. Univ Illinois, Chicago, IL 60607 USA. PAN, Inst Nucl Phys, Krakow, Poland. Univ Rochester, Rochester, NY 14627 USA. Natl Cent Univ, Chungli, Taiwan. RP Tonjes, MB (reprint author), Univ Maryland, College Pk, MD 20742 USA. EM tonjes@bnl.gov RI Decowski, Patrick/A-4341-2011; Mignerey, Alice/D-6623-2011; OI Holzman, Burt/0000-0001-5235-6314 NR 12 TC 14 Z9 14 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1243 EP S1246 AR PII S0954-3899(04)77859-7 DI 10.1088/0954-3899/30/8/099 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800100 ER PT J AU Tuchin, KL AF Tuchin, KL TI Heavy quark production from colour glass condensate at RHIC SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID FLAVOR PRODUCTION; SMALL-X; SATURATION; EVOLUTION; NUCLEI; DIS/; QCD AB I consider production of heavy quarks in pA and AA collisions in the framework of the colour glass condensate. I discuss the heavy quark production in pA collisions in a classical approximation which takes into account all multiple rescatterings of a proton in a nucleus. For peripheral collisions, the heavy quark production cross section can be written in the k(T)-factorized form. The k(T)-factorization is used to construct a simple model which takes into account both classical and quantum effects in pA and AA collisions. I review the main result of calculation based on that model: open charm in the central rapidity region at RHIC gets suppressed as a function of rapidity. Although the numbers obtained for the suppression factor are model dependent, the very fact of suppression is the general feature of the colour glass condensate at RHIC kinematical region. It indicates the onset of quantum evolution effects in a nucleus and is universal for all inclusive processes. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Tuchin, KL (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM tuchin@quark.phy.bnl.gov NR 19 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1167 EP S1170 AR PII S0954-3899(04)76897-8 DI 10.1088/0954-3899/30/8/082 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800083 ER PT J AU Veres, GI Back, BB Baker, MD Ballintijn, M Barton, DS Becker, B Betts, RR Bickley, AA Bindel, R Busza, W Carroll, A Decowski, MP Garcia, E Gburek, T George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Harrington, AS Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Khan, N Kulinich, P Kuo, CM Lee, JW Lin, WT Manly, S Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Roland, C Roland, G Sagerer, J Sarin, P Sedykh, I Skulski, W Smith, CE Steinberg, P Stephans, GSF Sukhanov, A Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wozniak, K Wyslouch, B Zhang, J AF Veres, GI Back, BB Baker, MD Ballintijn, M Barton, DS Becker, B Betts, RR Bickley, AA Bindel, R Busza, W Carroll, A Decowski, MP Garcia, E Gburek, T George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Harrington, AS Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Khan, N Kulinich, P Kuo, CM Lee, JW Lin, WT Manly, S Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Roland, C Roland, G Sagerer, J Sarin, P Sedykh, I Skulski, W Smith, CE Steinberg, P Stephans, GSF Sukhanov, A Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wozniak, K Wyslouch, B Zhang, J CA PHOBOS Collaboration TI Identified hadron spectra from PHOBOS SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID COLLISIONS AB Transverse momentum spectra of pions, kaons and protons, as well as antiparticle. to particle ratios near mid-rapidity from d+Au collisions at rootS(NN) 200 GeV have been measured by the PHOBOS experiment at RHIC. The transverse momentum range of particle identification was extended to beyond 3 GeV/c using the TOF detector and a new trigger system. The pseudorapidity dependence of the nuclear modification factor for charged hadrons in d+Au collisions is presented. C1 MIT, Cambridge, MA 02139 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Illinois, Chicago, IL 60607 USA. Univ Maryland, College Pk, MD 20742 USA. PAN, Inst Phys Nucl, Krakow, Poland. Univ Rochester, Rochester, NY 14627 USA. Natl Cent Univ, Chungli 32054, Taiwan. RP Veres, GI (reprint author), MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA. EM veres@mit.edu RI Decowski, Patrick/A-4341-2011; Mignerey, Alice/D-6623-2011; OI Holzman, Burt/0000-0001-5235-6314 NR 18 TC 8 Z9 8 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1143 EP S1147 AR PII S0954-3899(04)77942-6 DI 10.1088/0954-3899/30/8/077 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800078 ER PT J AU Wong, CY AF Wong, CY TI Does HBT measure the freeze-out source distribution? SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID INTERFEROMETRY; COLLISIONS AB It is generally assumed that as a result of multiple scattering, the source distribution measured in HBT interferometry corresponds to a chaotic source at freeze-out. This assumption is subject to question as effects of multiple scattering in HBT measurements must be investigated within a quantum mechanical framework. Applying the Glauber multiple scattering theory at high energies and the optical model at lower energies, we find that multiple scattering leads to an effective HBT density distribution that depends on the initial chaotic source distribution with an absorption. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. RP Wong, CY (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. EM wongc@ornl.gov OI Wong, Cheuk-Yin/0000-0001-8223-0659 NR 17 TC 20 Z9 21 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1053 EP S1057 AR PII S0954-3899(04)77418-6 DI 10.1088/0954-3899/30/8/057 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800058 ER PT J AU Wozniak, K Back, BB Baker, MD Ballintijn, M Barton, DS Betts, RR Bickley, AA Bindel, R Budzanowski, A Busza, W Carroll, A Chai, Z Decowski, MP Garcia, E George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Heintzelman, GA Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Katzy, J Khan, N Kucewicz, W Kulinich, P Kuo, CM Lin, WT Manly, S McLeod, D Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Remsberg, LP Reuter, M Roland, C Roland, G Rosenberg, L Sagerer, J Sarin, P Sawicki, P Skulski, W Steinberg, P Stephans, GSF Sukhanov, A Tang, JL Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wuosmaa, AH Wyslouch, B AF Wozniak, K Back, BB Baker, MD Ballintijn, M Barton, DS Betts, RR Bickley, AA Bindel, R Budzanowski, A Busza, W Carroll, A Chai, Z Decowski, MP Garcia, E George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Heintzelman, GA Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Katzy, J Khan, N Kucewicz, W Kulinich, P Kuo, CM Lin, WT Manly, S McLeod, D Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Remsberg, LP Reuter, M Roland, C Roland, G Rosenberg, L Sagerer, J Sarin, P Sawicki, P Skulski, W Steinberg, P Stephans, GSF Sukhanov, A Tang, JL Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Wolfs, FLH Wosiek, B Wuosmaa, AH Wyslouch, B CA PHOBOS Collaboration TI Charged particle multiplicity fluctuations in Au+Au collisions at root s(NN)=200 GeV SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn AB This paper presents the first PHOBOS results on charged particle multiplicity fluctuations measured for Au+Au collisions at the highest RHIC energy within a wide pseudorapidity range of \eta\ < 3. The dependence on collision geometry is removed in the analysis by using the normalized difference between the number of particles in separate eta bins. We compare our data to HIJING model predictions. C1 Inst Nucl Phys, PL-31342 Krakow, Poland. Argonne Natl Lab, Argonne, IL 60439 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. MIT, Cambridge, MA 02139 USA. Univ Illinois, Chicago, IL 60607 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Rochester, Rochester, NY 14627 USA. Natl Cent Univ, Chungli 32054, Taiwan. RP Wozniak, K (reprint author), Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, Poland. RI Decowski, Patrick/A-4341-2011; Mignerey, Alice/D-6623-2011 NR 8 TC 9 Z9 9 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S1377 EP S1380 AR PII S0954-3899(04)77692-6 DI 10.1088/0954-3899/30/8/131 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800132 ER PT J AU Xu, ZB AF Xu, ZB TI Bulk properties and flow SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article; Proceedings Paper CT 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions CY JAN 11-17, 2004 CL Oakland, CA SP UD DOE, US Natl Sci Fdn ID COLLISIONS; DYNAMICS AB In this paper, I summarize the experimental results on bulk properties and flow presented at Quark Matter 2004. It is organized in four sections: (1) initial condition and stopping; (2) particle spectra and freeze-outs; (3) anisotropic flow and (4) outlook for future measurements. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Xu, ZB (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 54 TC 4 Z9 4 U1 2 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI BP S927 EP S934 AR PII S0954-3899(04)77858-5 DI 10.1088/0954-3899/30/8/035 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800036 ER PT J AU Ritter, HG Wang, XN AF Ritter, HG Wang, XN TI Quark Matter 2004 - The 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (11-17 January 2004, Oakland, California, USA) SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Editorial Material C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Ritter, HG (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 2004 VL 30 IS 8 SI SI PG 2 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 847UR UT WOS:000223421800001 ER PT J AU Kim, Y Chao, YJ Pechersky, MJ Morgan, MJ AF Kim, Y Chao, YJ Pechersky, MJ Morgan, MJ TI C-specimen fracture toughness testing: Effect of side grooves and eta factor SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article DE arc-shaped tension specimen; elastic-plastic fracture; three dimensional; crack-front field; finite element method; side-groove; eta factor ID PARAMETERS AB Elastic-plastic crack front fields in arc-shaped tension specimens (C-specimens) were analyzed by a three-dimensional finite element method. The effect of side grooves on the ductile fracture behavior was investigated by studying the J-integral distribution, planestrain constraint parameter and development of plastic zones and comparing to experimental data. The applicability of the eta factor (derived for use with compact tension specimens) for the calculation of J-integral values for the C-specimen was also investigated. The results show that side grooves promote and establish near plane strain conditions at the crack front in sub-size specimens. It was also found that a two-dimensional plane-strain analysis in conjunction with the standard American Society for Testing and Materials (ASTM) tests was sufficient to determine the fracture toughness values from side-grooved C-specimen. The results indicate the eta factor for compact tension specimen as specified in the ASTM standards appears to produce reliable results for the calculation of J of C-specimens. C1 Univ S Carolina, Dept Mech Engn, Columbia, SC 29208 USA. Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. RP Kim, Y (reprint author), Univ S Carolina, Dept Mech Engn, Columbia, SC 29208 USA. NR 17 TC 6 Z9 6 U1 1 U2 5 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 2004 VL 126 IS 3 BP 293 EP 299 DI 10.1115/1.1762425 PG 7 WC Engineering, Mechanical SC Engineering GA 854YE UT WOS:000223939000003 ER PT J AU Lee, JK Yi, JY Hong, KS AF Lee, JK Yi, JY Hong, KS TI Structural and electrical properties (1-x)(Na1/2Bi1/2)TiO3-xPb(Mg1/3Nb2/3)O-3 solid solution SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE sodium bismuth titanate; phase transition; piezoelectricity ID PHASE-TRANSITIONS; SUBSTITUTED (NA1/2BI1/2)TIO3; ELECTROMECHANICAL PROPERTIES; DIELECTRIC-PROPERTIES; CERAMICS; SYSTEM AB Structural, dielectric and piezoelectric properties of (1 - x)(Na1/2Bi1/2)TiO3-xPb(Mg1/3Nb2/3)O-3 (NBT-xPMN) solid solution have been investigated. An addition of PMN into NBT transformed the structure of sintered samples from rhombohedral to pseudocubic phase where x is larger than 0.1. In calcined powders, however, the intermediate structure were observed between rhombohedral and cubic phases near x = 0.1. The formation of solid solution between NBT and PMN modified the dielectric and piezoelectric properties of NBT to be suitable for high temperature dielectric and piezoelectric material. With increasing the content of PMN, the temperature-stability of epsilon(r)(T) increased and the high temperature dielectric loss decreased. In addition, the piezoelectric property of NBT-xPMN was enhanced, for the decrease of coercive field and conductivity promoted the domain reversal under the high electric field of the poling process. (C) 2004 Elsevier Inc. All rights reserved. C1 ESA, US EPA, Los Alamos Natl Lab, Mat Sci & Technol Div,ESA Energy & Proc Engn, Los Alamos, NM 87545 USA. Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151742, South Korea. RP Lee, JK (reprint author), ESA, US EPA, Los Alamos Natl Lab, Mat Sci & Technol Div,ESA Energy & Proc Engn, MS J580, Los Alamos, NM 87545 USA. EM jklee@lanl.gov NR 17 TC 15 Z9 15 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD AUG PY 2004 VL 177 IS 8 BP 2850 EP 2854 DI 10.1016/j.jssc.2004.04.046 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 844GH UT WOS:000223145500029 ER PT J AU Oliveira, EA Guedes, I Ayala, AP Gesland, JY Ellena, J Moreira, RL Grimsditch, M AF Oliveira, EA Guedes, I Ayala, AP Gesland, JY Ellena, J Moreira, RL Grimsditch, M TI Crystal structure and vibrational spectrum of the NaCaM92F7 pyrochlore SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE pyrochlore; vibrational spectrum; disorder; symmetry lowering ID RAMAN-SPECTROSCOPY; MODE; ORDER AB The crystalline structure of NaCaMg2F7 was determined using single crystal X-ray diffraction. This compound crystallizes in the cubic pyrochlore structure, i.e., space group Fd (3) over barm, lattice parameter: a = 10.2610(5) Angstrom and Z = 8. All atoms occupy special crystalline sites, but Na and Ca are randomly distributed in the anti-cristobalite sub-lattice of the pyrochlore structure. The vibrational spectrum was determined by polarized Raman scattering and infrared reflectance. The number of observed Raman and infrared active phonons is larger than that predicted by the factor group analysis of the pyrochlore structure. The anomalous vibrational spectrum is discussed in terms of a disorder-induced symmetry lowering mechanism. (C) 2004 Elsevier Inc. All rights reserved. C1 Univ Fed Ceara, Dept Fis, BR-60451970 Fortaleza, Ceara, Brazil. Univ Maine Cristallog, UMR 6087, F-72085 Le Mans 9, France. USP, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil. Univ Fed Minas Gerais, ICEx, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Ayala, AP (reprint author), Univ Fed Ceara, Dept Fis, Caixa Postal 6030, BR-60451970 Fortaleza, Ceara, Brazil. EM ayala@fisica.ufc.br RI UFC, DF/E-1564-2017; Ellena, Javier/B-9104-2012; Ayala, Alejandro/A-7518-2008; Moreira, Roberto/B-8568-2013; Universidade Federal do Ceara, Physics Department/J-4630-2016; GUEDES, ILDE/C-3451-2013; Sao Carlos Institute of Physics, IFSC/USP/M-2664-2016 OI Ellena, Javier/0000-0002-0676-3098; Ayala, Alejandro/0000-0002-9247-6780; Universidade Federal do Ceara, Physics Department/0000-0002-9247-6780; GUEDES, ILDE/0000-0002-1040-5891; NR 28 TC 12 Z9 12 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD AUG PY 2004 VL 177 IS 8 BP 2943 EP 2950 DI 10.1016/j.jssc.2004.04.055 PG 8 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 844GH UT WOS:000223145500042 ER PT J AU Nukala, PKVV Simunovic, S Zapperi, S AF Nukala, PKVV Simunovic, S Zapperi, S TI Percolation and localization in the random fuse model SO JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT LA English DT Article DE fracture (theory) ID FOURIER ACCELERATION; FRACTURE PRECURSORS; DISORDERED-SYSTEMS; BREAKDOWN; BEHAVIOR; PLASTICITY; INTERFACES; AVALANCHES; NETWORKS; SURFACES AB We analyse damage nucleation and localization in the random fuse model with strong disorder using numerical simulations. In the initial stages of the fracture process, damage evolves in an uncorrelated manner, resembling percolation. Subsequently, as the damage starts to accumulate, current enhancement at the tips of the microcracks leads eventually to catastrophic failure. We study this behaviour, quantifying the deviations from percolation and discussing alternative scaling laws for damage. The analysis of damage profiles confirms that localization occurs abruptly, starting from a uniform damage landscape. Finally, we show that the cumulative damage distribution follows the normal distribution, suggesting that damage is uncorrelated on large length scales. C1 Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. Univ Roma La Sapienza, Dipartimento Fis, INFM UdR Roma 1, I-00185 Rome, Italy. Univ Roma La Sapienza, Dipartimento Fis, SMC, I-00185 Rome, Italy. RP Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. EM nukalapk@ornl.gov; simunovics@ornl.gov; zapperi@pil.phys.uniromal.it RI Zapperi, Stefano/C-9473-2009 OI Zapperi, Stefano/0000-0001-5692-5465 NR 39 TC 20 Z9 20 U1 0 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 1742-5468 J9 J STAT MECH-THEORY E JI J. Stat. Mech.-Theory Exp. PD AUG PY 2004 AR P08001 DI 10.1088/1742-5468/2004/08/P08001 PG 23 WC Mechanics; Physics, Mathematical SC Mechanics; Physics GA 901SG UT WOS:000227301600001 ER PT J AU Norton, SJ AF Norton, SJ TI Iterative algorithms for computing the shape of a hard scattering object: Computing the shape derivative SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The problem of determining the shape of an acoustically hard scattering object from remote scattering measurements is considered. An iterative approach is used to find the object shape that minimizes the mean-squared difference between a set of actual and predicted scattering observations. A crucial task in this minimization is the computation of the "shape derivative," or functional gradient, of the mean-square error with respect to the object's shape or boundary. The shape derivative tells us how to update the object's shape to reduce the mean-square error at each iteration. If, for example, the object's boundary is parameterized with N variables, a brute-force approach to computing the shape derivative using finite-differences would require a minimum of N+1 forward solutions per iteration. We show how the shape derivative can be computed with just two forward solutions: one ordinary forward solution and a suitably constructed adjoint solution. This approach is independent of N and is not only far more efficient, but numerically less error prone, than finite-difference schemes for computing derivatives. (C) 2004 Acoustical Society of America. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Norton, SJ (reprint author), Geophex Ltd, Raleigh, NC 27603 USA. EM norton@geophex.com NR 6 TC 8 Z9 8 U1 1 U2 1 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 2004 VL 116 IS 2 BP 1002 EP 1008 DI 10.1121/1.1771611 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA 845YQ UT WOS:000223281800036 ER PT J AU Anderson, RR Martello, DV White, CM Crist, KC John, K Modey, WK Eatough, DJ AF Anderson, RR Martello, DV White, CM Crist, KC John, K Modey, WK Eatough, DJ TI The regional nature of PM2.5 episodes in the upper Ohio River Valley SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID ORGANIC AEROSOL; PARTICLES; PITTSBURGH; HEALTH AB From October 1999 through September 2000, particulate matter (PM) with aerodynamic diameter greater than or equal to2.5 mum (PM2.5) mass and composition were measured at the National Energy Technology Laboratory Pittsburgh site, with a particle concentrator Brigham Young University-organic sampling system and a tapered element oscillating microbalance (TEOM) monitor. PM2.5 measurements had also been obtained with TEOM monitors located in the Pittsburgh, PA, area, and at sites in Ohio, including Steubenville, Columbus, and Athens. The PM data from all these sites were analyzed on high PM days; PM2.5 TEOM particulate mass at all sites was generally associated with transitions from locally high barometric pressure to lower pressure. Elevated concentrations occurred with transport of PM from outside the local region in advance of frontal passages as the local pressure decreased. During high-pressure periods, concentrations at the study sites were generally low throughout the study region. Further details related to this transport were obtained from surface weather maps and estimated back-trajectories using the hybrid single-particle Lagrangian integrated trajectory model associated with these time periods. These analyses indicated that transport of pollutants to the Pittsburgh site was generally from the west to the southwest. These results suggest that the Ohio River Valley and possible regions beyond act as a significant source of PM and its precursors in the Pittsburgh area and at the other regional sites included in this study. C1 US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. Ohio Univ, Inst Sustainable Energy & Environm, Air Qual Ctr, Athens, OH 45701 USA. Texas A&M Univ, Dept Environm Engn, Kingsville, TX USA. Brigham Young Univ, Dept Chem & Biochem, Provo, UT 84602 USA. Argonne Natl Lab, Div Environm Res, Atmospher Sci Sect, Argonne, IL 60439 USA. RP Anderson, RR (reprint author), US DOE, Natl Energy Technol Lab, POB 10940,MS 94-212, Pittsburgh, PA 15236 USA. EM richard.anderson@netl.doe.gov NR 26 TC 12 Z9 12 U1 1 U2 4 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA ONE GATEWAY CENTER, THIRD FL, PITTSBURGH, PA 15222 USA SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD AUG PY 2004 VL 54 IS 8 BP 971 EP 984 PG 14 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 844NA UT WOS:000223164000009 PM 15373365 ER PT J AU Brennecka, GL Huebner, W Tuttle, BA Clem, PG AF Brennecka, GL Huebner, W Tuttle, BA Clem, PG TI Use of stress to produce highly oriented tetragonal lead zirconate titanate (PZT 40/60) thin films and resulting electrical properties SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SOLID-SOLUTION SYSTEM; TIME TEXTURE TRANSITION; THERMODYNAMIC THEORY; CRYSTALLIZATION BEHAVIOR; SINGLE-CRYSTAL; YOUNGS MODULUS; GEL; PZT; TEMPERATURE; GROWTH AB Thin films of Pb(Zr0.4Ti0.6)O-3 produced by chemical solution deposition were used to study the effects of stress from different platinized single-crystal substrates on film orientation and resulting electrical properties. Films deposited on MgO preferred a (001) orientation due to compressive stress on the film during cooling through the Curie temperature (T-C). Films on Al2O3 were under minimal stress at T-C, resulting in a mixture of orientations. Those on Si preferred a (111) orientation due to templating from the bottom electrode. Films oriented in the <001> direction demonstrated lower dielectric constants and higher P-r and -d(31), values than (111) films. C1 Univ Missouri, Dept Ceram Engn, Rolla, MO 65409 USA. Sandia Natl Labs, Integrated Mat Res Lab, Albuquerque, NM 87185 USA. RP Brennecka, GL (reprint author), Univ Illinois, Dept Mat Sci & Engn, 1304 W Green St, Urbana, IL 61801 USA. RI Brennecka, Geoff/J-9367-2012 OI Brennecka, Geoff/0000-0002-4476-7655 NR 44 TC 33 Z9 33 U1 1 U2 13 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43086-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD AUG PY 2004 VL 87 IS 8 BP 1459 EP 1465 PG 7 WC Materials Science, Ceramics SC Materials Science GA 850RJ UT WOS:000223629800009 ER PT J AU Simner, SP Anderson, MD Stevenson, JW AF Simner, SP Anderson, MD Stevenson, JW TI La(Sr)FeO3 SOFC cathodes with marginal copper doping SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID YTTRIA-STABILIZED ZIRCONIA AB (La0.8Sr0.2)(0.98)Fe0.98Cu0.02O3-delta can be sintered directly onto YSZ (without the need for a protective ceria interlayer). Though subject to an extended "burn-in" period (similar to200 h), anode-supported YSZ cells using the Cu-doped LSF achieve power densities ranging from 1.3 to 1.7 W/cm(2) at 750 degreesC and 0.7 V. These cells have also demonstrated 500 h of stable performance. The results are somewhat surprising given that XRD indicates an interaction between (La0.8Sr0.2)(0.98)Fe0.98Cu0.02O3-delta and YSZ resulting in the formation of strontium zirconate and/or monoclinic zirconia. The amount and type of reaction product was fount to be dependent on cathode and electrolyte powder precalcination temperatures. C1 Pacific NW Natl Lab, Div Mat Sci, Richland, WA 99352 USA. RP Simner, SP (reprint author), Pacific NW Natl Lab, Div Mat Sci, Richland, WA 99352 USA. EM steven.simner@pnl.gov NR 11 TC 11 Z9 11 U1 2 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43086-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD AUG PY 2004 VL 87 IS 8 BP 1471 EP 1476 PG 6 WC Materials Science, Ceramics SC Materials Science GA 850RJ UT WOS:000223629800011 ER PT J AU Christensen, AN Jensen, TR Scarlett, NVY Madsen, IC AF Christensen, AN Jensen, TR Scarlett, NVY Madsen, IC TI Hydrolysis of pure and sodium substituted calcium aluminates and cement clinker components investigated by in situ synchrotron X-ray powder diffraction SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID TRICALCIUM ALUMINATE; HYDRATION AB The hydrolysis of pure and sodium-substituted calcium aluminates and cement clinker phases was investigated in situ in the temperature range 25-170 degreesC, using the angle dispersive powder synchrotron powder X-ray diffraction technique. The final hydrolysis product in all cases was Ca3Al2(OH)(12). The intermediate phase Ca4Al2O7.19H(2)O was formed from the pure calcium aluminates, and the intermediate phases Ca4Al2O7.xH(2)O, x = 11, 13, or 19, were formed from the cement clinker phases. C1 Aarhus Univ, Dept Chem, DK-8000 Aarhus C, Denmark. CSIRO, Clayton, Vic 3169, Australia. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Christensen, AN (reprint author), Hojkolvej 7, DK-8210 Aarhus V, Denmark. RI Hanson, jonathan/E-3517-2010; OI Jensen, Torben Rene/0000-0002-4278-3221 NR 15 TC 10 Z9 10 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43086-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD AUG PY 2004 VL 87 IS 8 BP 1488 EP 1493 PG 6 WC Materials Science, Ceramics SC Materials Science GA 850RJ UT WOS:000223629800014 ER PT J AU Hinoki, T AF Hinoki, T TI Coating of high Z material on silicon carbide by infrared transient-liquid-phase processing SO JOURNAL OF THE JAPAN INSTITUTE OF METALS LA Japanese DT Article DE coating; interface; microstructure; silicon carbide; tungsten; molybdenum AB Tungsten (W) and molybdenum (Mo) were coated on silicon carbide (SiC) as refractory armor using high power plasma arc lamp at powers up to 23.5 MW/m(2). Both W powder and Mo powder were melted and formed coating layers on SiC. The effect of pretreatment (vapor deposition of titanium (Ti), W and Mo and annealing) and sample heating conditions on microstructure of the coating and coating/substrate interface were investigated. The microstructure was observed by scanning electron microscopy (SEM) and optical microscopy (OM). A strong W coating was successfully formed. Tungsten vapor deposition and pre-heating at 5.2 MW/m(2) made for a refractory layer containing no cracks which propagated into the SiC substrate. This layer was formed without the thick reaction layers (WC and W5Si3) reported in previous studies. Moreover the thinner interface transition layer and armor avoid coefficient of thermal expansion (CTE) mismatch driven failure previously reported. For this study, small WC grains were observed adjacent to interface. Silicon carbide grains and W5Si3 grains were observed within W coating. By contrast, Mo was not formed as well as W due to larger CTE mismatch than that for W and SiC. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Hinoki, T (reprint author), Kyoto Univ, Inst Adv Energy, Gokasho Uji, Kyoto 6110011, Japan. NR 6 TC 0 Z9 0 U1 1 U2 2 PU JAPAN INST METALS PI SENDAI PA 1-14-32, ICHIBANCHO, AOBA-KU, SENDAI, 980-8544, JAPAN SN 0021-4876 EI 1880-6880 J9 J JPN I MET JI J. Jpn. Inst. Met. PD AUG PY 2004 VL 68 IS 8 BP 544 EP 547 DI 10.2320/jinstmet.68.544 PG 4 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 851QG UT WOS:000223699300013 ER PT J AU Peele, AG Nugent, KA Mancuso, AP Paterson, D McNulty, I Hayes, JP AF Peele, AG Nugent, KA Mancuso, AP Paterson, D McNulty, I Hayes, JP TI X-ray phase vortices: theory and experiment SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID ORBITAL ANGULAR-MOMENTUM; OPTICAL VORTICES; WAVE-FRONT; SCREW DISLOCATIONS; SPIRAL PHASEPLATE; LIGHT-BEAMS; VORTEX; RECONSTRUCTION; DIFFRACTION; INTENSITY AB We review the current work on x-ray phase vortices. We explain the role of an x-ray vortex in phase recovery and speculate on its possible applications in other fields of x-ray optical research. We present our theoretical understanding of the structure of phase vortices and test these predictions against experiment. We present experimental observations of phase vortices with charge greater than 3 and observe that their propagation appears to be consistent with our theoretical models. (C) 2004 Optical Society of America. C1 Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. Swinburne Univ Technol, Ind Res Inst Swinburne, Hawthorn, Vic 3122, Australia. RP Peele, AG (reprint author), Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia. EM peele@physics.unimelb.edu.au RI Nugent, Keith/J-2699-2012; Nugent, Keith/I-4154-2016 OI Nugent, Keith/0000-0003-1522-8991; Nugent, Keith/0000-0002-4281-3478 NR 51 TC 17 Z9 17 U1 0 U2 8 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1084-7529 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD AUG PY 2004 VL 21 IS 8 BP 1575 EP 1584 DI 10.1364/JOSAA.21.001575 PG 10 WC Optics SC Optics GA 841KI UT WOS:000222928300025 PM 15330486 ER PT J AU Dixit, NM Perelson, AS AF Dixit, NM Perelson, AS TI Multiplicity of human immunodeficiency virus infections in lymphoid tissue SO JOURNAL OF VIROLOGY LA English DT Article ID HIV-1 INFECTION; IN-VIVO; T-CELLS; DYNAMICS; RECOMBINATION; NEF AB Human immunodeficiency virus type 1 (HIV-1)-infected splenocytes in humans were recently shown to harbor three to four proviruses per cell on average (A. Jung et al., Nature 418:144, 2002). However, the mechanisms that lead to such extensive multiple infections are not understood. Here, we find by using mathematical analysis that two mechanisms quantitatively capture the distribution of proviral genomes in HIV-1-infected splenocytes, one where multiple genomes are acquired one at a time in a series of sequential infectious contacts of a target cell with free virions and infected cells, and the other where cell-to-cell transmission of multiple virions or genomes results from a single infectious contact of a target cell with an infected cell. The two mechanisms imply different genetic diversities of proviruses within an infected cell and therefore different rates of emergence of drug resistance via recombination. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Perelson, AS (reprint author), Los Alamos Natl Lab, Div Theoret, MS K710,T10, Los Alamos, NM 87545 USA. EM asp@lanl.gov FU NCRR NIH HHS [R01 RR006555, RR06555]; NIAID NIH HHS [AI28433, R37 AI028433, R01 AI028433] NR 12 TC 43 Z9 43 U1 1 U2 4 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0022-538X J9 J VIROL JI J. Virol. PD AUG PY 2004 VL 78 IS 16 BP 8942 EP 8945 DI 10.1128/JVI.78.16.8942-8945.2004 PG 4 WC Virology SC Virology GA 843AH UT WOS:000223046000056 PM 15280505 ER PT J AU Mays, JW Uhrig, D Gido, S Zhu, YQ Weidisch, R Iatrou, H Hadjichristidis, N Hong, K Beyer, F Lach, R Buschnakowski, M AF Mays, JW Uhrig, D Gido, S Zhu, YQ Weidisch, R Iatrou, H Hadjichristidis, N Hong, K Beyer, F Lach, R Buschnakowski, M TI Synthesis and structure - Property relationships for regular multigraft copolymers SO MACROMOLECULAR SYMPOSIA LA English DT Article; Proceedings Paper CT International Symposium on Ionic Polymerization CY JUN 30-JUL 04, 2003 CL Boston, MA SP Int Union Pure & Appl Chem, Amer Chem Soc, Polymer Div, Univ Akron, Univ Massachusetts, Natl Sci Fdn DMR, Amer Chem Soc, Petr Res Fund, Asahi Kasei Corp, BASF, Bayer Corp, Boston Sci Corp, Bridgestone Firestone, Chemetall Foote Corp, Chevron Phillips Chem Co, GE, Kaneka Corp, Korea Kumho Petrochem Co Ltd, Kraton Polymers, Sartomer, Synthomer, John Wiley & Sons Inc, Wyatt Technol Corp DE anionic polymerization; graft copolymer; mechanical properties; molecular architecture; morphology ID DOUBLE-GRAFT-COPOLYMERS; MOLECULAR ARCHITECTURE; BRANCH-POINTS; CENTIPEDES; MORPHOLOGY; POLYSTYRENES; COMBS AB Multigraft copolymers with polyisoprene backbones and polystyrene branches, having multiple regularly spaced branch points, were synthesized by anionic polymerization high vacuum techniques and controlled chlorosilane linking chemistry. The functionality of the branch points (1, 2 and 4) can be controlled, through the choice of chlorosilane linking agent. The morphologies of the various graft copolymers were investigated by transmission electron microscopy and X-ray scattering. It was concluded that the morphology of these complex architectures is governed by the behavior of the corresponding miktoarm star copolymer associated with each branch point (constituting block copolymer), which follows Milner's theoretical treatment for miktoarm stars. By comparing samples having the same molecular weight backbone and branches but different number of branches it was found that the extent of long range order decreases with increasing number of branch points. The stress-strain properties in tension were investigated for some of these multigraft copolymers. For certain compositions thermoplastic elastomer (TPE) behavior was observed, and in many instances the elongation at break was much higher (2-3X) than that of conventional triblock TPEs. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. Flinders Univ S Australia, Sch Chem Phys & Earth Sci, Adelaide, SA 5001, Australia. Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA. Polymer Res Inst, D-01068 Dresden, Germany. Univ Athens, Dept Chem, GR-15771 Athens, Greece. USA, Res Lab, Polymers Res Branch, Aberdeen Proving Ground, MD 21005 USA. Univ Halle Wittenberg, Dept Mat Sci, D-06099 Halle Saale, Germany. RP Mays, JW (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. RI Umlauf, Ursula/D-3356-2014; Uhrig, David/A-7458-2016; Hong, Kunlun/E-9787-2015 OI Uhrig, David/0000-0001-8447-6708; Hong, Kunlun/0000-0002-2852-5111 NR 17 TC 23 Z9 23 U1 2 U2 10 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 1022-1360 J9 MACROMOL SYMP JI Macromol. Symp. PD AUG PY 2004 VL 215 BP 111 EP 126 DI 10.1002/masy.200451110 PG 16 WC Polymer Science SC Polymer Science GA 862LK UT WOS:000224492100011 ER PT J AU Zhou, R Pickup, S Yankeelov, TE Springer, CS Glickson, JD AF Zhou, R Pickup, S Yankeelov, TE Springer, CS Glickson, JD TI Simultaneous measurement of arterial input function and tumor pharmacokinetics in mice by dynamic contrast enhanced imaging: Effects of transcytolemmal water exchange SO MAGNETIC RESONANCE IN MEDICINE LA English DT Article DE dynamic contrast enhanced MRI; gadodiamide; arterial input function; mouse; RIF-1 tumor; perfusion ID GD-DTPA; IN-VIVO; MAGNETIC-RESONANCE; MRI; KINETICS; TRACER; TISSUE; SUSCEPTIBILITY; INJECTION; DIFFUSION AB A noninvasive technique for simultaneous measurement of the arterial input function (AIF) for gadodiamide (Omniscan) and its uptake in tumor was demonstrated in mice. Implantation of a tumor at a suitable location enabled its visualization in a cardiac short axis image. Sets of gated, low-resolution saturation recovery images were acquired from each of five tumor-bearing mice following intravenous administration of a bolus of contrast agent (CA). The AIF was extracted from the signal intensity changes in left ventricular blood using literature values of the CA relaxivity and a precontrast T-1 map. The time-dependent (H2O)-H-1 relaxation rate constant (R-1 = 1/T-1) in the tumor was modeled using the BOLus Enhanced Relaxation Overview (BOLERO) method in two modes regarding the equilibrium transcytolemmal water exchange system: 1) constraining it exclusively to the fast exchange limit (FXL) (the conventional assumption), and 2) allowing its transient departure from FXL and access to the fast exchange regime (FXR), thus designated FXL/FXR. The FXL/FXR analysis yielded better fittings than the FXL-constrained analysis for data from the tumor rims, whereas the results based on the two modes were indistinguishable for data from the tumor cores. For the tumor rims, the values of K-trans (the rate constant for CA transfer from the vasculature to the interstitium) and v. (volume fraction of the tissue extracellular and extravascular space) returned from FXL/FXR analysis are consistently greater than those from the FXL-constrained analysis by a factor of 1.5 or more corresponding to a CA dose of 0.05 mmole/kg. (C) 2004 Wiley-Liss, Inc. C1 Univ Penn, Dept Radiol, B1 Stellar Chance Labs, Philadelphia, PA 19104 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. SUNY Stony Brook, Dept Biomed Engn, Stony Brook, NY 11794 USA. SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. RP Zhou, R (reprint author), Univ Penn, Dept Radiol, B1 Stellar Chance Labs, 422 Curie Blvd, Philadelphia, PA 19104 USA. EM zhou@rad.upenn.edu OI Springer, Charles/0000-0002-5966-2135 FU NCI NIH HHS [CA51935, CA83105, P01 CA56690]; NIBIB NIH HHS [R01 EB00422]; NINDS NIH HHS [R01 NS40801] NR 40 TC 68 Z9 69 U1 1 U2 7 PU JOHN WILEY & SONS INC PI HOBOKEN PA 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0740-3194 J9 MAGNET RESON MED JI Magn. Reson. Med. PD AUG PY 2004 VL 52 IS 2 BP 248 EP 257 DI 10.1002/mrm.20143 PG 10 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 843XU UT WOS:000223121400004 PM 15282806 ER PT J AU Hook, SE Lee, RF AF Hook, SE Lee, RF TI Interactive effects of UV, benzo[alpha] pyrene, and cadmium on DNA damage and repair in embryos of the grass shrimp Paleomonetes pugio SO MARINE ENVIRONMENTAL RESEARCH LA English DT Article; Proceedings Paper CT 12th International Symposium on Pollutant Responses in Marine Organisms (PRIMO 12) CY MAY 09, 2002-MAY 13, 2003 CL Safety Harbor, FL SP Natl Inst Environm Hlth Sci, Int Soc Study Xenobiot, Univ Florida, Coll Pharmacy, Biosense Labs, Mol Light Technol Res, Hamilton Thorne Biosci, Elsevier Publishers, United States Geol Survey, BRD FL Integrated Sci Ctr DE genotoxicity; developmental loxicity; DNA repair; multiple stresses; comet assay AB We examined the link between DNA strand breaks and hatching rates in grass shrimp, (Paleomonetes pugio), embryos exposed to 0.2 muM benzo[alpha] pyrene (BP), 5 muM cadmium (Cd) and 330 kJ/m(2) UV light, either alone or together. After exposure, embryos were transferred to clean seawater with or without 5 muM Cd. Hatching rates and DNA strand breaks (Comet Assay) were determined. DNA lesions caused by exposure to BP, UV light, or BP/cadmium were rapidly repaired and were not associated with any effects on hatching. Exposure to Cd after exposure to BP or UV did not affect embryological development or DNA repair. Exposure to BP/UV resulted in a high level of DNA lesions which were slowly repaired. Exposure to cadmium following BP/UV exposure inhibited hatching and DNA repair. Adducts formed during exposure to BP/UV exposure may be difficult to excise or may saturate the nucleotide excision repair system. (C) 2004 Elsevier Ltd. All rights reserved. C1 Skidaway Inst Oceanog, Savannah, GA 31411 USA. RP Hook, SE (reprint author), Pacific NW Natl Lab, Marine Sci Lab, 1529 Sequim Bay Rd, Sequim, WA 98362 USA. EM Sharon.Hook@pnl.gov RI Hook, Sharon/D-9067-2011 FU NIEHS NIH HHS [1F32 ES11243-01] NR 8 TC 22 Z9 25 U1 0 U2 3 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-1136 J9 MAR ENVIRON RES JI Mar. Environ. Res. PD AUG-DEC PY 2004 VL 58 IS 2-5 BP 735 EP 739 DI 10.1016/j.marvenres.2004.03.087 PG 5 WC Environmental Sciences; Marine & Freshwater Biology; Toxicology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Toxicology GA 831MS UT WOS:000222199100091 PM 15178107 ER PT J AU Chen, B Huang, Y Liu, C Wu, PD MacEwen, SR AF Chen, B Huang, Y Liu, C Wu, PD MacEwen, SR TI A dilatational plasticity theory for viscoplastic materials SO MECHANICS OF MATERIALS LA English DT Article DE Gurson model; dilatational plasticity; viscoplastic material; void growth ID POROUS DUCTILE SOLIDS; TRIAXIAL STRESS-FIELDS; APPROXIMATE MODELS; THEORETICAL-MODELS; VOID COALESCENCE; SPHERICAL VOIDS; YIELD CRITERIA; METALS; CAVITIES; INSTABILITIES AB The dilatational plasticity theory of [J. Engng. Mater. Tech. 99 (1977) 2] is generalized in this paper for viscoplastic materials. A unit-cell model of a viscoplastic matrix containing a microvoid is adopted to establish the viscoplastic constitutive relations for voided, dilating materials. Approximate analytic constitutive relations are proposed, which not only have the correct asymptotic limits but also agree well with the unit-cell model. (C) 2003 Elsevier Ltd. All rights reserved. C1 Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA. Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Alcan Int Ltd, Kingston, ON K7L 5L9, Canada. RP Huang, Y (reprint author), Univ Illinois, Dept Mech & Ind Engn, 1206 W Green Str, Urbana, IL 61801 USA. EM huang9@uiuc.edu RI Huang, Yonggang/B-6998-2009; Wu, Peidong/A-7009-2008 NR 25 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 EI 1872-7743 J9 MECH MATER JI Mech. Mater. PD AUG PY 2004 VL 36 IS 8 BP 679 EP 689 DI 10.1016/j.mechmat.2002.07.001 PG 11 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA 814PS UT WOS:000220987200003 ER PT J AU Mitchell, JN Stan, M Schwartz, DS Boehlert, CJ AF Mitchell, JN Stan, M Schwartz, DS Boehlert, CJ TI Phase stability and phase transformations in plutonium and plutonium-gallium alloys SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Terence E Mitchell Symposium on Magic of Materials held at the 2003 TMS Annual Meeting CY MAR 02-03, 2003 CL San Diego, CA SP TMS ID BINARY-SYSTEMS; EQUILIBRIUM AB The complexity of phase stability and transformations in plutonium alloys is reflected in the plutonium-gallium (Pu-Ga) phase diagram, which is perhaps the most complex of all binary systems. Although many investigations have explored phase equilibria, transformation systematics, and structure/property relations in the Pu-Ga system, many outstanding problems remain and new issues regularly appear. In this article, we describe recent dilatometry and calorimetry measurements on pure plutonium and plutonium-gallium alloys. We also present recent phase diagram modeling that attempts to unravel differences between the U.S. and Russian Pu-Ga phase diagrams. The ultimate goal of this work is to produce the first internally consistent database of thermophysical properties of this system so that a true equilibrium phase diagram can be produced and so that stability can be predicted over a range of conditions. C1 Alfred Univ, Dept Ceram Engn & Mat Sci, Alfred, NY 14802 USA. Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. EM jeremy@lanl.gov NR 20 TC 28 Z9 28 U1 1 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD AUG PY 2004 VL 35A IS 8 BP 2267 EP 2278 DI 10.1007/s11661-006-0206-8 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 843HK UT WOS:000223069100009 ER PT J AU Dracup, B Turchi, PEA Radmilovic, V Dahmen, U Morris, JW AF Dracup, B Turchi, PEA Radmilovic, V Dahmen, U Morris, JW TI Validation of predicted precipitate compositions in Al-Si-Ge SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID CAVITY NUCLEATION; SYSTEM; ALLOY; PHASE AB Aged alloys of Al-0.5Si-0.5Ge (at. pet) contain diamond-cubic-A4 precipitates in a dispersion that is much finer than is found in alloys with Si or Ge alone. To help understand this aging behavior, the present work was undertaken to determine alloy composition as a function of aging temperature. The composition was estimated theoretically using a CALPHAD approach, and measured experimentally with energy-dispersive spectroscopy (EDS) in a high-resolution electron microscope. Theory and experiment are in reasonable agreement. As the aging temperature rises, the precipitates become enriched in Si, changing from 50 at. pet in the low-temperature limit to about 80 at. pet Si as the temperature approaches 433degreesC, the high-temperature limit of the precipitate field. C1 Exponent Failure Anal, Los Angeles, CA 90066 USA. Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, Dept Mat Sci, Livermore, CA USA. RP Morris, JW (reprint author), Exponent Failure Anal, Los Angeles, CA 90066 USA. EM jwmorris@berkeley.edu NR 26 TC 6 Z9 6 U1 0 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD AUG PY 2004 VL 35A IS 8 BP 2305 EP 2311 DI 10.1007/s11661-006-0210-z PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 843HK UT WOS:000223069100013 ER PT J AU Milewski, JO Javernick, DA AF Milewski, JO Javernick, DA TI The microstructural response of delta-stabilized plutonium to pulsed laser welding SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID GALLIUM ALLOYS AB The effects of the welding parameters on weld-bead morphology and the microstructural evolution of autogenous conduction-mode melted laser welds in gallium delta-stabilized plutonium were investigated. This investigation demonstrates that delta-stabilized plutonium is easily welded with a pulsed Nd:YAG laser. Variations in the welding parameters created a range of heat inputs that had a significant effect on the size and morphology of the resultant weld and associated heat-affected-zone (HAZ) microstructure. Unlike other low-melting-temperature materials such as aluminum alloys, neither fusion-zone porosity nor hot cracking was observed. The reactivity of plutonium promotes the rapid formation of surface oxides that inhibit complete weld-joint fusion. The high viscosity of the plutonium molten pool impeded the breakup of the surface oxide by fluid motion, thus further impeding joint fusion. Modifications to input parameters to affect changes in the weld-pool flow were only partially successful in improving joint fusion. Analysis of the weld region using optical and electron microscopy and electron microprobe analysis revealed fusion-zone microstructures consisting of fine acicular delta grains, with a limited amount of retained alpha phase. The Pu6Fe, the low-melting-point intermetallic phase, was observed in the base material and the partially melted HAZ. Further investigation into the solid/solid phase transformations, specifically the effect of the cooling rate, during the cooling of the weld will be required to describe fully the microstructural development of the fusion zone. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Milewski, JO (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA. EM milewski@lanl.gov NR 18 TC 0 Z9 0 U1 2 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD AUG PY 2004 VL 35A IS 8 BP 2445 EP 2454 DI 10.1007/s11661-006-0225-5 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 843HK UT WOS:000223069100028 ER PT J AU Westphal, AJ Snead, C Butterworth, A Graham, GA Bradley, JP Bajt, S Grant, PG Bench, G Brennan, S Pianetta, P AF Westphal, AJ Snead, C Butterworth, A Graham, GA Bradley, JP Bajt, S Grant, PG Bench, G Brennan, S Pianetta, P TI Aerogel keystones: Extraction of complete hypervelocity impact events from aerogel collectors SO METEORITICS & PLANETARY SCIENCE LA English DT Article ID DUST AB In January 2006, the Stardust mission will return the first samples from a solid solar system body beyond the Moon and the first samples of contemporary interstellar dust ever collected. Although sophisticated laboratory instruments exist for the analysis of Stardust samples, techniques for the recovery of particles and particle residues from aerogel collectors remain primitive. Here, we describe our recent progress in developing techniques for extracting small volumes of aerogel, which we have called "keystones," which completely contain particle impacts but minimize the damage to the surrounding aerogel collector. These keystones can be fixed to custom-designed micromachined silicon fixtures (so called "microforklifts"). In this configuration, the samples are self-supporting, which can be advantageous in situations where interference from a supporting substrate is undesirable. The keystones may also be extracted and placed onto a substrate without a fixture. We have also demonstrated the capability of homologously crushing these unmounted keystones for analysis techniques that demand flat samples. C1 Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Inst Geophys & Planetary Phys, Lawrence Livermore Natl Lab, Livermore, CA 94035 USA. Ctr Accelerator Mass Spectrometry, Lawrence Livermore Natl Lab, Livermore, CA 94035 USA. Stanford Synchrotron Radiat Lab, Livermore, CA 94550 USA. RP Westphal, AJ (reprint author), Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. EM westphal@ssl.berkeley.edu RI Bajt, Sasa/G-2228-2010 NR 16 TC 87 Z9 87 U1 0 U2 5 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 BP 1375 EP 1386 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 849WD UT WOS:000223571200009 ER PT J AU Coker, RF Cohen, BA AF Coker, RF Cohen, BA TI Modeling the minimum size of CM parent bodies SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc ID AMINO-ACID RACEMIZATION; LIQUID WATER C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA. EM robc@lanl.gov NR 5 TC 0 Z9 0 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A24 EP A24 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600032 ER PT J AU Crawford, DA Barnouin-Jha, OS AF Crawford, DA Barnouin-Jha, OS TI Mesoscale computational investigation of shocked heterogeneous materials: Strength of rocks under impact loading SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA. EM dacrawf@sandia.gov RI Barnouin, Olivier/I-7475-2015 OI Barnouin, Olivier/0000-0002-3578-7750 NR 8 TC 0 Z9 0 U1 0 U2 1 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A26 EP A26 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600036 ER PT J AU Folco, L Welten, KC Nishiizumi, K Hillegonds, DJ AF Folco, L Welten, KC Nishiizumi, K Hillegonds, DJ TI Discovery and terrestrial age of GRO 01149, an extremely small, weathered, and old H chondrite found on top of Frontier Mountain, Antarctica SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc C1 Museo Nazl Antartide, I-53100 Siena, Italy. Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, CAMS, Livermore, CA 94550 USA. EM folco@unisi.it; kcwelten@uclink4.berkeley.edu NR 5 TC 2 Z9 2 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A40 EP A40 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600064 ER PT J AU Krot, AN Yurimoto, H Petaev, MI Hutcheon, ID Wark, D AF Krot, AN Yurimoto, H Petaev, MI Hutcheon, ID Wark, D TI Type CCAIs: New insights into early solar system processes SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc ID RICH INCLUSIONS; CARBONACEOUS CHONDRITES; C INCLUSIONS C1 Univ Hawaii Manoa, Honolulu, HI 96822 USA. Tokyo Inst Technol, Tokyo 152, Japan. Harvard Univ, Cambridge, MA 02138 USA. Lawrence Livermore Natl Lab, Livermore, CA USA. Monash Univ, Clayton, Vic 3168, Australia. EM sasha@higp.hawaii.edu NR 9 TC 4 Z9 4 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A57 EP A57 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600097 ER PT J AU Krot, AN Yurimoto, H Hutcheon, ID Scott, ERD AF Krot, AN Yurimoto, H Hutcheon, ID Scott, ERD TI Oxygen isotope exchange in cats and chondrules: Implication for oxygen isotope reservoirs in the solar nebula SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc ID ALUMINUM-RICH INCLUSIONS; CARBONACEOUS CHONDRITES; ALLENDE; AL-26 C1 Tokyo Inst Technol, Tokyo 152, Japan. LLNL, Livermore, CA USA. NR 18 TC 6 Z9 6 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A56 EP A56 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600096 ER PT J AU Lee, T Calaway, WF Chen, CY Moore, JF Pellin, MJ Veryovkin, IV AF Lee, T Calaway, WF Chen, CY Moore, JF Pellin, MJ Veryovkin, IV TI Dust-buster isotope TOF-MS for stardust SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc C1 Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RI Pellin, Michael/B-5897-2008; Lee, Typhoon/N-8347-2013 OI Pellin, Michael/0000-0002-8149-9768; NR 0 TC 1 Z9 1 U1 0 U2 2 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A59 EP A59 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600102 ER PT J AU Taylor, DJ McKeegan, KD Krot, AN Hutcheon, ID AF Taylor, DJ McKeegan, KD Krot, AN Hutcheon, ID TI In situ investigation of Al-Mg systematics in Efremovka CAI E62 SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc C1 Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA. Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, HIGP, Honolulu, HI 96822 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM dtaylor@ess.ucla.edu RI McKeegan, Kevin/A-4107-2008 OI McKeegan, Kevin/0000-0002-1827-729X NR 3 TC 0 Z9 0 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A104 EP A104 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600192 ER PT J AU Welten, KC Nishiizumi, K Hillegonds, DJ Caffee, MW Masarik, J AF Welten, KC Nishiizumi, K Hillegonds, DJ Caffee, MW Masarik, J TI Unraveling the exposure histories of aubrites SO METEORITICS & PLANETARY SCIENCE LA English DT Meeting Abstract CT 67th Annual Meeting of the Meteoritical-Society CY AUG 02-06, 2004 CL Rio de Janeiro, BRAZIL SP Meteorit Soc C1 Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. Comenius Univ, Dept Nucl Phys, Bratislava, Slovakia. EM kewelten@uclink4.berkeley.edu NR 6 TC 8 Z9 8 U1 0 U2 1 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD AUG PY 2004 VL 39 IS 8 SU S BP A113 EP A113 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 842GB UT WOS:000222990600210 ER PT J AU O'Keefe, MA AF O'Keefe, MA TI Image formation in the high-resolution transmission electron microscope SO MICROSCOPY AND MICROANALYSIS LA English DT Letter ID ATOMIC-RESOLUTION; RECONSTRUCTION; FOCUS C1 LBNL, Div Mat Sci, Berkeley, CA 94720 USA. RP O'Keefe, MA (reprint author), LBNL, Div Mat Sci, 2-200 Cyclotron Rd, Berkeley, CA 94720 USA. EM maok@LBL.gov NR 16 TC 2 Z9 2 U1 1 U2 5 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH ST, NEW YORK, NY 10011-4211 USA SN 1431-9276 J9 MICROSC MICROANAL JI Microsc. microanal. PD AUG PY 2004 VL 10 IS 4 BP 397 EP 399 DI 10.1017/S143192760401054 PG 3 WC Materials Science, Multidisciplinary; Microscopy SC Materials Science; Microscopy GA 843BI UT WOS:000223049700001 PM 15327698 ER PT J AU Diebold, AC Foran, B Kisielowski, C Muller, DA Pennycook, SJ Principe, E Stemmer, S AF Diebold, AC Foran, B Kisielowski, C Muller, DA Pennycook, SJ Principe, E Stemmer, S TI Image formation in the high-resolution transmission electron microscope - Authors' response SO MICROSCOPY AND MICROANALYSIS LA English DT Letter ID FOCUS C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. RI Stemmer, Susanne/H-6555-2011 OI Stemmer, Susanne/0000-0002-3142-4696 NR 5 TC 1 Z9 1 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH ST, NEW YORK, NY 10011-4211 USA SN 1431-9276 J9 MICROSC MICROANAL JI Microsc. microanal. PD AUG PY 2004 VL 10 IS 4 BP 399 EP 400 PG 2 WC Materials Science, Multidisciplinary; Microscopy SC Materials Science; Microscopy GA 843BI UT WOS:000223049700002 ER PT J AU Cumings, J Zettl, A McCartney, MR AF Cumings, J Zettl, A McCartney, MR TI Carbon nanotube electrostatic biprism: Principle of operation and proof of concept SO MICROSCOPY AND MICROANALYSIS LA English DT Article DE nanotube; carbon nanotube; biprism; electrostatic biprism; holography; electron holography; field emission ID POTENTIALS; HOLOGRAPHY; QUANTUM AB During in situ transmission electron microscopy (TEM) field emission experiments, carbon nanotubes are observed to strongly diffract the imaging TEM electron beam. We demonstrate that this effect is identical to that of a standard electrostatic biprism. We also demonstrate that the nanotube biprism can be used to capture electron-holographic information. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Arizona State Univ, Ctr Solid State Sci, Tempe, AZ 85287 USA. RP Cumings, J (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM cumings@stanford.edu RI Cumings, John/A-3595-2012; Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 16 TC 5 Z9 5 U1 0 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 1431-9276 J9 MICROSC MICROANAL JI Microsc. microanal. PD AUG PY 2004 VL 10 IS 4 BP 420 EP 424 DI 10.1017/S1431927604040759 PG 5 WC Materials Science, Multidisciplinary; Microscopy SC Materials Science; Microscopy GA 843BI UT WOS:000223049700005 PM 15327702 ER PT J AU Johnson, E Andersen, HH Dahmen, U AF Johnson, E Andersen, HH Dahmen, U TI Nanoscale lead and noble gas inclusions in aluminum: Structures and properties SO MICROSCOPY RESEARCH AND TECHNIQUE LA English DT Article DE transmission electron microscopy; pressurized noble gas inclusions; Wulff construction; magic sizes; edge energies and crystal shapes; grain boundary inclusion; superheating and premelting ID TRANSMISSION ELECTRON-MICROSCOPE; XE-IMPLANTED ALUMINUM; LIQUID PB INCLUSIONS; GRAIN-BOUNDARIES; EQUILIBRIUM SHAPE; INERT-GAS; MELTING-POINT; VECTOR THERMODYNAMICS; ANISOTROPIC SURFACES; LATTICE IMAGES AB Transmission electron microscopy has been used for structural and physical characterization of nanoscale inclusions of lead and noble gases in aluminum. When the inclusion sizes approach nanoscale dimensions, many of their properties are seen to deviate from similar properties in bulk and in most cases the deviations will increase as the inclusion sizes decrease. Binary alloys of lead and noble gases with aluminum are characterized by extremely low mutual solubilities and inclusions will, therefore, exist as practically pure components embedded in the aluminum matrix. Furthermore, the thermal vacancy mobility in aluminum at and above room temperature is sufficiently high to accommodate volume strains associated with the inclusions thus leading to virtually strain free crystals. The inclusions grow in parallel cube alignment with the aluminum matrix and have a cuboctahedral shape, which reflects directly the anisotropy of the interfacial energies. Inclusions in grain boundaries can have single crystalline or bicrystalline morphology that can be explained from a generalized Wulff analysis such as the xi-vector construction. The inclusions have been found to display a variety of nanoscale features such as high Laplace pressure, size-dependent superheating during melting, deviations from the Wulff shape displaying magic size effects, a shape dependence of edge energy, and so on. All these effects have been observed and monitored by TEM using conventional imaging conditions and high-resolution conditions in combination with in-situ analysis at elevated temperatures. (C) 2004 Wiley-Liss, Inc. C1 Univ Copenhagen, Niels Bohr Inst, Orsted Lab, DK-2100 Copenhagen O, Denmark. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark. Univ Copenhagen, Niels Bohr Inst, Nano Sci Ctr, DK-2100 Copenhagen O, Denmark. RP Univ Copenhagen, Niels Bohr Inst, Orsted Lab, Univ Pk 5, DK-2100 Copenhagen O, Denmark. EM Johnson@fys.ku.dk NR 87 TC 12 Z9 12 U1 1 U2 2 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 1059-910X EI 1097-0029 J9 MICROSC RES TECHNIQ JI Microsc. Res. Tech. PD AUG PY 2004 VL 64 IS 5-6 BP 356 EP 372 DI 10.1002/jemt.20097 PG 17 WC Anatomy & Morphology; Biology; Microscopy SC Anatomy & Morphology; Life Sciences & Biomedicine - Other Topics; Microscopy GA 876ME UT WOS:000225500300003 PM 15549703 ER PT J AU Kesler, SE Chesley, JT Christensen, JN Hagni, RD Heijlen, W Kyle, JR Muchez, P Misra, KC van der Voo, R AF Kesler, SE Chesley, JT Christensen, JN Hagni, RD Heijlen, W Kyle, JR Muchez, P Misra, KC van der Voo, R TI Discussion of "Tectonic controls of Mississippi Valley-type lead-zinc mineralization in orogenic forelands" by D.C. Bradley and D.L. Leach SO MINERALIUM DEPOSITA LA English DT Editorial Material ID ZN-PB DEPOSITS; CANADA SEDIMENTARY BASIN; JEFFERSON-CITY DISTRICT; AGE-DATING RESEARCH; RB-SR; GEOLOGICAL TIME; UPPER SILESIA; ORE-DEPOSITS; FLUID-FLOW; PALEOMAGNETISM C1 Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA. Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Isotope Geochem, Berkeley, CA 94720 USA. Univ Missouri, Dept Geol & Geophys, Rolla, MO 65409 USA. Katholieke Univ Leuven, B-3001 Louvain, Belgium. Univ Texas, Dept Geol Sci, Austin, TX 78712 USA. Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA. RP Kesler, SE (reprint author), Univ Michigan, Dept Geol Sci, 1006 CC Little Bldg, Ann Arbor, MI 48109 USA. EM skesler@umich.edu RI Christensen, John/D-1475-2015 NR 33 TC 12 Z9 12 U1 0 U2 10 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0026-4598 J9 MINER DEPOSITA JI Miner. Depos. PD AUG PY 2004 VL 39 IS 4 BP 512 EP 514 DI 10.1007/s00126-004-0422-3 PG 3 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA 854NM UT WOS:000223910600007 ER PT J AU Chiang, YJ Kim, SH Tessarollo, L Campisi, J Hodes, RJ AF Chiang, YJ Kim, SH Tessarollo, L Campisi, J Hodes, RJ TI Telomere-associated protein TIN2 is essential for early embryonic development through a telomerase-independent pathway SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Article ID POLY(ADP-RIBOSE) POLYMERASE; STEM-CELLS; TRF1; LENGTH; DNA; MAINTENANCE; REGULATOR AB TIN2 is a negative regulator of telomere elongation that interacts with telomeric DNA repeat binding factor 1 (TRF1) and affects telomere length by a telomerase-dependent mechanism. Here we show that inactivation of the mouse TRF1-interacting protein 2 (TIN2) gene results in early embryonic lethality. We further observed that the embryonic lethality of TIN2 mutant mice was not affected by inactivation of the telomerase reverse transcriptase gene, indicating that embryonic lethality is not the result of telomerase-dependent changes in telomere length or function. Our findings suggest that TIN2 has a role independent of telomere length regulation that is essential for embryonic development and cell viability. C1 NCI, Expt Immunol Branch, NIH, Bethesda, MD 20892 USA. NIA, NIH, Bethesda, MD 20892 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. NCI, Canc Res Ctr, Mouse Canc Genet Program, Frederick, MD 21702 USA. RP Chiang, YJ (reprint author), NCI, Expt Immunol Branch, NIH, Bldg 10,4B36,9000 Rockville Pike, Bethesda, MD 20892 USA. EM chiangj@mail.nih.gov NR 22 TC 43 Z9 47 U1 1 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0270-7306 J9 MOL CELL BIOL JI Mol. Cell. Biol. PD AUG PY 2004 VL 24 IS 15 BP 6631 EP 6634 DI 10.1128/mcb.24.15.6631-6634.2004 PG 4 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 839DZ UT WOS:000222764800009 PM 15254230 ER PT J AU Boore, JL Medina, M Rosenberg, LA AF Boore, JL Medina, M Rosenberg, LA TI Complete sequences of the highly rearranged molluscan mitochondrial genomes of the scaphopod Graptacme eborea and the bivalve Mytilus edulis SO MOLECULAR BIOLOGY AND EVOLUTION LA English DT Article DE scaphopod; bivalve; mollusk; mitochondria; evolution; genome ID COMPLETE DNA-SEQUENCE; GENE REARRANGEMENTS; LOLIGO-BLEEKERI; BLUE MUSSEL; ORGANIZATION; GASTROPODA; PHYLOGENY; ALBINARIA; HETEROPLASMY; APLACOPHORA AB We have determined the complete sequence of the mitochondrial genome of the scaphopod mollusk Graptacme eborea (14,492 nts) and completed the sequence of the mitochondrial genome of the bivalve mollusk Mytilus edulis (16,740 nts). (The name Graptacme eborea is a revision of the species formerly known as Dentalium eboreum.) G. eborea mtDNA contains the 37 genes that are typically found and has the genes divided about evenly between the two strands, but M. edulis contains an extra trnM and is missing atp8, and it has all genes on the same strand. Each has a highly rearranged gene order relative to each other and to all other studied mtDNAs. G. eborea mtDNA has almost no strand skew, but the coding strand of M. edulis mtDNA is very rich in G and T. This is reflected in differential codon usage patterns and even in amino acid compositions. G. eborea mtDNA has fewer noncoding nucleotides than any other mtDNA studied to date, with the largest noncoding region only 24 nt long. Phylogenetic analysis using 2,420 aligned amino acid positions of concatenated proteins weakly supports an association of the scaphopod with gastropods to the exclusion of Bivalvia, Cephalopoda, and Polyplacophora, but it is generally unable to convincingly resolve the relationships among major groups of the Lophotrochozoa, in contrast to the good resolution seen for several other major metazoan groups. C1 Univ Michigan, Dept Biol, Ann Arbor, MI 48109 USA. DOE Joint Genome Inst, Walnut Creek, CA USA. Lawrence Berkeley Lab, Walnut Creek, CA USA. RP Boore, JL (reprint author), Univ Michigan, Dept Biol, Ann Arbor, MI 48109 USA. EM jlboore@lbl.gov NR 52 TC 89 Z9 106 U1 2 U2 9 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0737-4038 J9 MOL BIOL EVOL JI Mol. Biol. Evol. PD AUG PY 2004 VL 21 IS 8 BP 1492 EP 1503 DI 10.1093/molbev/msh090 PG 12 WC Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity GA 841WB UT WOS:000222961400005 PM 15014161 ER PT J AU Burgett, WS Vick, MM Davis, DS Colless, M De Propris, R Baldry, I Baugh, C Bland-Hawthorn, J Bridges, T Cannon, R Cole, S Collins, C Couch, W Cross, N Dalton, G Driver, S Efstathiou, G Ellis, R Frenk, CS Glazebrook, K Hawkins, E Jackson, C Lahav, O Lewis, I Lumsden, S Maddox, S Madgwick, D Norberg, P Peacock, JA Percival, W Peterson, B Sutherland, W Taylor, K AF Burgett, WS Vick, MM Davis, DS Colless, M De Propris, R Baldry, I Baugh, C Bland-Hawthorn, J Bridges, T Cannon, R Cole, S Collins, C Couch, W Cross, N Dalton, G Driver, S Efstathiou, G Ellis, R Frenk, CS Glazebrook, K Hawkins, E Jackson, C Lahav, O Lewis, I Lumsden, S Maddox, S Madgwick, D Norberg, P Peacock, JA Percival, W Peterson, B Sutherland, W Taylor, K TI Substructure analysis of selected low-richness 2dFGRS clusters of galaxies SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE galaxies : clusters : general; large-scale structure of Universe ID X-RAY; REDSHIFT SURVEY; SUBCLUSTER MERGERS; OPTICAL ANALYSIS; COMA CLUSTER; CATALOG; DYNAMICS; SEGREGATION; COMPONENTS; APM AB Complementary one-, two- and three-dimensional tests for detecting the presence of substructure in clusters of galaxies are applied to recently obtained data from the 2dF Galaxy Redshift Survey. The sample of 25 clusters used in this study includes 16 clusters not previously investigated for substructure. Substructure is detected at or greater than the 99 per cent confidence level in at least one test for 21 of the 25 clusters studied here. From the results, it appears that low-richness clusters commonly contain subclusters participating in mergers. About half of the clusters have two or more components within 0.5 h(-1) Mpc of the cluster centroid, and at least three clusters (Abell 1139, Abell 1663 and Abell S333) exhibit velocity-position characteristics consistent with the presence of possible cluster rotation, shear, or infall dynamics. The geometry of certain features is consistent with influence by the host supercluster environments. In general, our results support the hypothesis that low-richness clusters relax to structureless equilibrium states on very long dynamical time-scales (if at all). C1 Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA. Univ Texas, Dept Phys, Richardson, TX 75083 USA. UMBC, Dept Phys, Joint Ctr Astrophys, Baltimore, MD 21250 USA. NASA, Goddard Space Flight Ctr, Lab High Energy Astrophys, Greenbelt, MD 20771 USA. Anglo Australian Observ, Epping, NSW 2121, Australia. Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia. Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. Univ Durham, Dept Phys, Durham DH1 3LE, England. Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada. Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead L14 1LD, Merseyside, England. Univ New S Wales, Dept Astrophys, Sydney, NSW 2052, Australia. Univ Oxford, Dept Phys, Oxford OX1 3RH, England. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England. CALTECH, Dept Astron, Pasadena, CA 91125 USA. Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England. CSIRO Australia Telescope Natl Facil, Epping, NSW 1710, Australia. Univ Leeds, Dept Phys, Leeds LS2 9JT, W Yorkshire, England. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. ETH Honggerberg, ETHZ Inst Astron, CH-8093 Zurich, Switzerland. Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland. RP Burgett, WS (reprint author), Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA. EM burgett@ifa.hawaii.edu RI Baugh, Carlton/A-8482-2012; Jackson, Carole/K-1648-2013; Driver, Simon/H-9115-2014; Glazebrook, Karl/N-3488-2015; OI Baugh, Carlton/0000-0002-9935-9755; Jackson, Carole/0000-0002-7089-8827; Baldry, Ivan/0000-0003-0719-9385; Driver, Simon/0000-0001-9491-7327; Glazebrook, Karl/0000-0002-3254-9044; Maddox, Stephen/0000-0001-5549-195X; Hawkins, Ed/0000-0001-9477-3677; Colless, Matthew/0000-0001-9552-8075 NR 52 TC 39 Z9 39 U1 0 U2 3 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD AUG 1 PY 2004 VL 352 IS 2 BP 605 EP 654 DI 10.1111/j.1365-2966.2004.07952.x PG 50 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 839YY UT WOS:000222822500025 ER PT J AU Banerjee, S Wong, SS AF Banerjee, S Wong, SS TI Demonstration of diameter-selective reactivity in the sidewall ozonation of SWNTs by resonance Raman spectroscopy SO NANO LETTERS LA English DT Article ID WALLED CARBON NANOTUBES; ELECTRONIC-STRUCTURE; FUNCTIONALIZATION; SEPARATION; SCATTERING; CHEMISTRY; CHANNELS; POLYMER; ROUTE AB Strategies for single-walled carbon nanotube (SWNT) separation are critical to developing nanotubes as useful nanoscale building blocks. Herein, we demonstrate that solution-phase ozonolysis of SWNTs fosters diameter selectivity in SWNTs. The main conclusion of our work is that in this sidewall addition reaction, smaller diameter tubes react more extensively than larger diameter tubes, which provides experimental validation for theoretical predictions on the role of pyramidalization and pi-orbital misalignment in nanotube reactivity. C1 SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Chem & Mat Sci, Upton, NY 11973 USA. RP Wong, SS (reprint author), SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. EM sswong@notes.cc.sunysb.edu NR 41 TC 82 Z9 85 U1 1 U2 16 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD AUG PY 2004 VL 4 IS 8 BP 1445 EP 1450 DI 10.1021/nl049261n PG 6 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 846CQ UT WOS:000223292800014 ER PT J AU Balet, LP Ivanov, SA Piryatinski, A Achermann, M Klimov, VI AF Balet, LP Ivanov, SA Piryatinski, A Achermann, M Klimov, VI TI Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes SO NANO LETTERS LA English DT Article ID QUANTUM DOTS AB We study inverted core/shell nanocrystals (NCs) in which a core of a wide gap semiconductor (ZnSe) is overcoated with a shell of a semiconductor of a narrower gap (CdSe). By monitoring radiative recombination lifetimes for a series of these NCs with a fixed core radius and progressively increasing shell thickness, we observe a continuous transition from Type-I (both electron and hole wave functions are distributed over the entire NC) to Type-II (electron and hole are spatially separated between the shell and the core) and back to Type-I (both electron and hole primarily reside in the shell) localization regimes. These observations are in good agreement with the calculated dependence of the electron-hole overlap integral on shell thickness. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Klimov, VI (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM klimov@lanl.gov RI Piryatinski, Andrei/B-5543-2009; Ivanov, Sergei/B-5505-2011; Achermann, Marc/A-1849-2011 OI Achermann, Marc/0000-0002-3939-9309 NR 11 TC 160 Z9 162 U1 5 U2 52 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD AUG PY 2004 VL 4 IS 8 BP 1485 EP 1488 DI 10.1021/nl049146c PG 4 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 846CQ UT WOS:000223292800021 ER PT J AU Kannan, B Kulkarni, RP Majumdar, A AF Kannan, B Kulkarni, RP Majumdar, A TI DNA-based programmed assembly of gold nanoparticles on lithographic patterns with extraordinary specificity SO NANO LETTERS LA English DT Article ID NANOCRYSTALS; NANOWIRES; FILMS AB We demonstrate the highly specific and programmed assembly of oligonucleotide-conjugated gold nanoparticles on lithographically defined microscale gold patterns. A key feature of our fabrication technique is the use of poly(ethylene glycol) (PEG) groups to form an inert coating on regions of the chip where no nanoparticle assembly is desired. By assembling multiple layers of DNA-conjugated nanoparticles we illustrate the capability of PEG surface coatings to exquisitely direct the nanoparticles onto the lithographic patterns with almost zero nonspecific reaction per square micron. We further suggest that the use of PEG to eliminate nonspecific reaction may be extended to micro- and nanoscale fabrication systems that make use of a variety of different nanostructures. C1 Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. CALTECH, Opt Biochem & Mol Biophys, Pasadena, CA 91125 USA. Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Majumdar, A (reprint author), Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. EM majumdar@me.berkeley.edu NR 13 TC 25 Z9 26 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD AUG PY 2004 VL 4 IS 8 BP 1521 EP 1524 DI 10.1021/nl049247a PG 4 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 846CQ UT WOS:000223292800028 ER PT J AU Kalinin, SV Jesse, S Shin, J Baddorf, AP Guillorn, MA Geohegan, DB AF Kalinin, SV Jesse, S Shin, J Baddorf, AP Guillorn, MA Geohegan, DB TI Scanning probe microscopy imaging of frequency dependent electrical transport through carbon nanotube networks in polymers SO NANOTECHNOLOGY LA English DT Article ID IMPEDANCE MICROSCOPY AB Frequency dependent electrical transport in the conducting networks of single walled carbon nanotubes embedded in polymers was studied by scanning impedance microscopy (SIM). SIM allows current flow in the nanotubes inside the polymer matrix at up to 100 nm below the surface to be imaged directly, providing a non-invasive approach for studying transport in these materials. The conductance of the composite is shown to be limited by a small number of bundle-bundle and bundle-contact junctions. For high frequencies, the SIM phase distribution along the networks is governed by the capacitive interaction between the nanotubes and the substrate and is in agreement with a transmission line model. For low driving frequencies the capacitive coupling to the back gate can be minimized and an approach for determining the potential distribution along the network by accounting for tip-surface capacitance variations is demonstrated. Thus, SIM provides a direct method for characterizing electrical transport through percolation networks formed by nanotube bundles in polymers or, more generally, nanorods in various matrices. C1 Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RP Kalinin, SV (reprint author), Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. RI Kalinin, Sergei/I-9096-2012; Jesse, Stephen/D-3975-2016; Baddorf, Arthur/I-1308-2016; Geohegan, David/D-3599-2013 OI Kalinin, Sergei/0000-0001-5354-6152; Jesse, Stephen/0000-0002-1168-8483; Baddorf, Arthur/0000-0001-7023-2382; Geohegan, David/0000-0003-0273-3139 NR 12 TC 11 Z9 11 U1 2 U2 20 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0957-4484 J9 NANOTECHNOLOGY JI Nanotechnology PD AUG PY 2004 VL 15 IS 8 BP 907 EP 912 AR PII S0957-4484(04)76305-9 DI 10.1088/0957-4484/15/8/006 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Science & Technology - Other Topics; Materials Science; Physics GA 850AG UT WOS:000223582500006 ER PT J AU Salwinski, L Eisenberg, D AF Salwinski, L Eisenberg, D TI In silico simulation of biological network dynamics SO NATURE BIOTECHNOLOGY LA English DT Article ID STOCHASTIC CHEMICAL-KINETICS; GILLESPIE ALGORITHM; SYSTEMS; CELLS AB Realistic simulation of biological networks requires stochastic simulation approaches because of the small numbers of molecules per cell. The high computational cost of stochastic simulation on conventional microprocessor-based computers arises from the intrinsic disparity between the sequential steps executed by a microprocessor program and the highly parallel nature of information flow within biochemical networks. This disparity is reduced with the Field Programmable Gate Array (FPGA)-based approach presented here. The parallel architecture of FPGAs, which can simulate the basic reaction steps of biological networks, attains simulation rates at least an order of magnitude greater than currently available microprocessors. C1 Univ Calif Los Angeles, DOE, Inst Gen & Prote, Howard Hughes Med Inst,Mol Biol Inst, Los Angeles, CA 90095 USA. RP Eisenberg, D (reprint author), Univ Calif Los Angeles, DOE, Inst Gen & Prote, Howard Hughes Med Inst,Mol Biol Inst, Box 951570, Los Angeles, CA 90095 USA. EM david@mbi.ucla.edu NR 15 TC 44 Z9 44 U1 1 U2 5 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1087-0156 J9 NAT BIOTECHNOL JI Nat. Biotechnol. PD AUG PY 2004 VL 22 IS 8 BP 1017 EP 1019 DI 10.1038/nbt991 PG 3 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA 842YB UT WOS:000223039500032 PM 15235611 ER PT J AU Wiley, HS Michaels, GS AF Wiley, HS Michaels, GS TI Should software hold data hostage? SO NATURE BIOTECHNOLOGY LA English DT Editorial Material C1 Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA. RP Wiley, HS (reprint author), Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA. EM steven.wiley@pnl.gov OI Wiley, Steven/0000-0003-0232-6867 NR 0 TC 11 Z9 11 U1 0 U2 0 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1087-0156 J9 NAT BIOTECHNOL JI Nat. Biotechnol. PD AUG PY 2004 VL 22 IS 8 BP 1037 EP 1038 DI 10.1038/nbt0804-1037 PG 2 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA 842YB UT WOS:000223039500037 PM 15286656 ER PT J AU Li, QJ Dinner, AR Qi, SY Irvine, DJ Huppa, JB Davis, MM Chakraborty, AK AF Li, QJ Dinner, AR Qi, SY Irvine, DJ Huppa, JB Davis, MM Chakraborty, AK TI CD4 enhances T cell sensitivity to antigen by coordinating Lck accumulation at the immunological synapse SO NATURE IMMUNOLOGY LA English DT Article ID PROTEIN KINASE P56LCK; SIGNAL-TRANSDUCTION; ACTIVATION; RECEPTOR; COMPLEX; RECOGNITION; MOLECULES; OLIGOMERIZATION; SURFACE; BINDING AB How T cells respond with extraordinary sensitivity to minute amounts of agonist peptide and major histocompatibility complex (pMHC) molecules on the surface of antigen-presenting cells bearing large numbers of endogenous pMHC molecules is not understood. Here we present evidence that CD4 affects the responsiveness of T helper cells by controlling spatial localization of the tyrosine kinase Lck in the synapse. This finding, as well as further in silico and in vitro experiments, led us to develop a molecular model in which endogenous and agonist pMHC molecules act cooperatively to amplify T cell receptor signaling. At the same time, activation due to endogenous pMHC molecules alone is inhibited. A key feature is that the binding of agonist pMHC molecules to the T cell receptor results in CD4-mediated spatial localization of Lck, which in turn enables endogenous pMHC molecules to trigger many T cell receptors. We also discuss broader implications for T cell biology, including thymic selection, diversity of the repertoire of self pMHC molecules and serial triggering. C1 Stanford Univ, Dept Chem, Berkeley, CA 94720 USA. Stanford Univ, Sch Med, Dept Microbiol & Immunol, Stanford, CA 94305 USA. Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Stanford Univ, Sch Med, Howard Hughes Med Inst, Stanford, CA 94305 USA. Univ Calif Berkeley, Biophys Grad Grp, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys Biosci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Chakraborty, AK (reprint author), Stanford Univ, Dept Chem, Berkeley, CA 94720 USA. EM mdavis@cmgm.stanford.edu; arup@uclink.berkeley.edu NR 50 TC 158 Z9 165 U1 0 U2 8 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1529-2908 J9 NAT IMMUNOL JI Nat. Immunol. PD AUG PY 2004 VL 5 IS 8 BP 791 EP 799 DI 10.1038/ni1095 PG 9 WC Immunology SC Immunology GA 841TX UT WOS:000222955600010 PM 15247914 ER PT J AU Kuykendall, T Pauzauskie, PJ Zhang, YF Goldberger, J Sirbuly, D Denlinger, J Yang, PD AF Kuykendall, T Pauzauskie, PJ Zhang, YF Goldberger, J Sirbuly, D Denlinger, J Yang, PD TI Crystallographic alignment of high-density gallium nitride nanowire arrays SO NATURE MATERIALS LA English DT Article ID LIGHT-EMITTING-DIODES; GROUP-III NITRIDES; GAN NANOWIRES; CATALYTIC GROWTH; NANODEVICES; ANISOTROPY; STATES C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. RP Yang, PD (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. EM p_yang@uclink.berkeley.edu RI Goldberger, Joshua/F-5484-2011; Pauzauskie, Peter/A-1316-2014; Goldberger, Joshua/N-8963-2016 OI Goldberger, Joshua/0000-0003-4284-604X; Goldberger, Joshua/0000-0003-4284-604X NR 28 TC 348 Z9 352 U1 17 U2 181 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 1476-1122 J9 NAT MATER JI Nat. Mater. PD AUG PY 2004 VL 3 IS 8 BP 524 EP 528 DI 10.1038/nmat1177 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 842YL UT WOS:000223040500016 PM 15273744 ER PT J AU Jia, QX Mccleskey, TM Burrell, AK Lin, Y Collis, GE Wang, H Li, ADQ Foltyn, SR AF Jia, QX Mccleskey, TM Burrell, AK Lin, Y Collis, GE Wang, H Li, ADQ Foltyn, SR TI Polymer-assisted deposition of metal-oxide films SO NATURE MATERIALS LA English DT Article ID THIN-FILMS; POLYVINYLPYRROLIDONE; LAALO3 C1 Los Alamos Natl Lab, Div Mat Sci & Technol, Superconduct Technol Ctr, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. Washington State Univ, Dept Chem, Pullman, WA 99164 USA. RP Jia, QX (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Superconduct Technol Ctr, Los Alamos, NM 87545 USA. EM qxjia@lanl.gov RI McCleskey, Thomas/J-4772-2012; Jia, Q. X./C-5194-2008; Wang, Haiyan/P-3550-2014; Collis, Gavin/D-6343-2011; lin, yuan/B-9955-2013; OI Wang, Haiyan/0000-0002-7397-1209; Mccleskey, Thomas/0000-0003-3750-3245 NR 14 TC 192 Z9 199 U1 16 U2 153 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 1476-1122 J9 NAT MATER JI Nat. Mater. PD AUG PY 2004 VL 3 IS 8 BP 529 EP 532 DI 10.1038/nmat1163 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 842YL UT WOS:000223040500017 PM 15258574 ER PT J AU Daniels, DS Woo, TT Luu, KX Noll, DM Clarke, ND Pegg, AE Tainer, JA AF Daniels, DS Woo, TT Luu, KX Noll, DM Clarke, ND Pegg, AE Tainer, JA TI DNA binding and nucleotide flipping by the human DNA repair protein AGT SO NATURE STRUCTURAL & MOLECULAR BIOLOGY LA English DT Article ID BASE EXCISION-REPAIR; O-6-ALKYLGUANINE-DNA ALKYLTRANSFERASE; CRYSTAL-STRUCTURE; ESCHERICHIA-COLI; O(6)-ALKYLGUANINE-DNA ALKYLTRANSFERASE; OXIDATIVE DEMETHYLATION; ALKYLATION DAMAGE; COMPLEX; HELIX; METHYLTRANSFERASE AB O-6-alkylguanine-DNA alkyltransferase (AGT), or O-6-methylguanine-DNA methyltransferase (MGMT), prevents mutations and apoptosis resulting from alkylation damage to guanines. AGT irreversibly transfers the alkyl lesion to an active site cysteine in a stoichiometric, direct damage reversal pathway. AGT expression therefore elicits tumor resistance to alkylating chemotherapies, and AGT inhibitors are in clinical trials. We report here structures of human AGT in complex with double-stranded DNA containing the biological substrate O-6-methylguanine or crosslinked to the mechanistic inhibitor N-1, O-6-ethanoxanthosine. The prototypical DNA major groove - binding helix-turn-helix (HTH) motif mediates unprecedented minor groove DNA binding. This binding architecture has advantages for DNA repair and nucleotide flipping, and provides a paradigm for HTH interactions in sequence-independent DNA-binding proteins like RecQ and BRCA2. Structural and biochemical results further support an unpredicted role for Tyr114 in nucleotide flipping through phosphate rotation and an efficient kinetic mechanism for locating alkylated bases. C1 Scripps Res Inst, Skaggs Inst Chem Biol, La Jolla, CA 92037 USA. Penn State Univ, Coll Med, Dept Cellular & Mol Physiol, Hershey, PA 17033 USA. Johns Hopkins Univ, Sch Med, Dept Biophys & Biophys Chem, Baltimore, MD 21205 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Tainer, JA (reprint author), Scripps Res Inst, Skaggs Inst Chem Biol, MB-4,10550 N Torrey Pines Rd, La Jolla, CA 92037 USA. EM jat@scripps.edu RI Clarke, Neil/D-9613-2014; OI Daniels, Douglas/0000-0003-0238-9403 NR 48 TC 185 Z9 187 U1 4 U2 24 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1545-9985 J9 NAT STRUCT MOL BIOL JI Nat. Struct. Mol. Biol. PD AUG PY 2004 VL 11 IS 8 BP 714 EP 720 DI 10.1038/nsmb791 PG 7 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 841LF UT WOS:000222930600015 PM 15221026 ER PT J AU Basunia, MS AF Basunia, MS TI Nuclear data sheets for A=175 SO NUCLEAR DATA SHEETS LA English DT Review ID NEUTRON-DEFICIENT ISOTOPES; HIGH-SPIN STATES; ODD-A-NUCLEI; DEEP-INELASTIC REACTIONS; FIRST EXCITED STATES; 396 KEV LEVEL; ALPHA-DECAY; INTERNAL-CONVERSION; ROTATIONAL STATES; SHAPE COEXISTENCE AB Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for all nuclei with mass number A=175. This evaluation for A=175 supersedes the earlier one by A. O. Macchiavelli and E. Browne (1993Ma79), published in Nuclear Data Sheets 69, 903 (1993). Highlights of this publication are the following: This evaluation includes the first study (1996Zh03) of Er-175 beta(-) decay, which has been used to interpret a predicted ground state doublet in Tm-175. The deep-inelastic reaction studies (1999As05, 1997Le11, and 1997Le10) extended the yrast band of Yb-175 to the Jpi= 41/2- level at 4426 keV. New studies (1994Mi04) of Yb-175 beta(-) decay have provided significantly more precise gamma-ray intensities. New data (2002Ro17 and 1998To14) from the alpha decay of Tl-179 have been used for tentatively assigning spin and parity to Au-175 ground and first-excited states. Tentative assignment of Hg-175 g.s. is adopted from Tl-176 proton decay (2004Ke06). Cutoff Date: All data available prior to June 1 2004 have been evaluated. General Policies and Organization of Material; See the introductory pages. Acknowledgments: The evaluator is highly grateful to E. Browne for his assistance and patient guidance throughout this evaluation and also wish to thank the reviewer for comments and suggestions. General Comments: The alpha hindrance factors (HF) presented in this evaluation have bee, calculated using values of the radius parameter (r(0)) interpolated from those for even-even adjacent nuclei given in 1998Ak04. The Limitation of Relative Statistical Weight (LWM) method (1985ZiZY) has been used for some discrepant datasets in this evaluation. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 175 TC 17 Z9 17 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 0090-3752 EI 1095-9904 J9 NUCL DATA SHEETS JI Nucl. Data Sheets PD AUG PY 2004 VL 102 IS 4 BP 719 EP + DI 10.1016/j.nds.2004.09.002 PG 180 WC Physics, Nuclear SC Physics GA 863XJ UT WOS:000224596500001 ER PT J AU Sha, WT Chien, TH Sun, JG Chao, B AF Sha, WT Chien, TH Sun, JG Chao, B TI Analysis of large-scale tests, for AP-600 passive containment cooling system SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB All next-generation light water reactors utilize passive systems to remove heat via natural circulation and are significantly different from past and current nuclear plant designs. One unique feature of the AP-600 is its passive containment cooling system (PCCS), which is designed to maintain containment pressure below the design limit for 72 h without action by the reactor operator. During a design-basis accident (DBA), i.e., either a loss-of-coolant or a main-steam-line break accident, steam escapes and comes in contact with the much cooler containment vessel wall. Heat is transferred to the inside surface of the steel containment wall by convection and condensation of steam and through the containment steel wall by conduction. Heat is then transferred from the outside of the containment surface by heating and evaporation of a thin liquid film that is formed by applying water at the top of the containment vessel dome. Air in the annular space is heated by both convection and injection of steam from the evaporating liquid film. The heated air and vapor rise as a result of natural circulation and exit the shield building through the outlets above the containment shell. All of the analytical models that are developed for and used in the COMMIX-1D code for predicting performance of the PCCS will be described. These models cover governing conservation equations for multicomponents single-phase flow, transport equations for the k - epsilon two-equation turbulence model, auxiliary equations, liquid-film tracking model for both inside (condensate) and outside (evaporating liquid film) surfaces of the containment vessel wall, thermal coupling between flow domains inside and outside the containment vessel, and heat and mass transfer models. Various key parameters of the COMMIX-1D results and corresponding AP-600 PCCS experimental data are compared and the agreement is good. Significant findings from this study are summarized. (C) 2004 Elsevier B.V. All rights reserved. C1 ANL E, Argonne, IL 60439 USA. Univ Illinois, Dept Mech Engn, Urbana, IL 61801 USA. RP Sun, JG (reprint author), ANL E, ET-212, Argonne, IL 60439 USA. EM Sun@anl.gov NR 27 TC 14 Z9 17 U1 1 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD AUG PY 2004 VL 232 IS 2 BP 197 EP 216 DI 10.1016/j.nucengdes.2004.05.003 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 856CW UT WOS:000224022200009 ER PT J AU McEligot, DM Jackson, JD AF McEligot, DM Jackson, JD TI "Deterioration" criteria for convective heat transfer in gas flow through non-circular ducts SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID MIXED CONVECTION; TURBULENT FRICTION; REGION; TEMPERATURE; IMPROVEMENT; PASSAGE; ANNULI; TUBE AB The reduction in turbulent, convective heat transfer parameters observed in some supercritical data and in experiments with common gases can be due to radial property variation, acceleration, buoyancy or combinations of these phenomena, depending on the conditions of the applications. To date criteria for the onsets of these effects have been developed for vertical circular tubes. This note presents extensions of these criteria to non-circular ducts with constant cross-sections as in the cooling channels of some advanced nuclear reactors. (C) 2004 Elsevier B.V. All rights reserved. C1 INEEL, Idaho Falls, ID 83415 USA. Univ Arizona, Tucson, AZ 85721 USA. Victoria Univ Manchester, Manchester M13 9PL, Lancs, England. RP McEligot, DM (reprint author), INEEL, Idaho Falls, ID 83415 USA. EM DM6@inel.gov NR 39 TC 52 Z9 57 U1 4 U2 17 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD AUG PY 2004 VL 232 IS 3 BP 327 EP 333 DI 10.1016/j.nucengdas.2004.05.004 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 865GQ UT WOS:000224691100008 ER PT J AU Sakamoto, Y Suzuki, T Ide, S Koide, Y Takenaga, H Kamada, Y Fujita, T Fukuda, T Takizuka, T Shirai, H Oyama, N Miura, Y Hill, KW Rewoldt, G AF Sakamoto, Y Suzuki, T Ide, S Koide, Y Takenaga, H Kamada, Y Fujita, T Fukuda, T Takizuka, T Shirai, H Oyama, N Miura, Y Hill, KW Rewoldt, G CA JT-60 Team TI Properties of internal transport barrier formation in JT-60U SO NUCLEAR FUSION LA English DT Article ID REVERSED-SHEAR PLASMAS; IMPROVED CONFINEMENT; TOKAMAK PLASMAS; DIII-D; DISCHARGES; PERFORMANCE; REACTOR; REGIMES; FIELD; TIME AB The dependence of the thermal diffusivity on the heat flux has been investigated in JT-60U plasmas by varying the neutral beam power. In positive magnetic shear (PS) plasmas, the ion thermal diffusivity (chi(i)) in the core region generally increases with the heating power, as with the L mode at low heating powers. However, as a result of the intensive central heating, a weak internal transport barrier (ITB) is formed, and the chi(i) value in the core region starts to decrease. Corresponding to a further increase in the heating power, a strong ITB is formed and the chi(i) value is reduced substantially. In the case of reversed magnetic shear (RS) plasmas, on the other hand, no power degradation of the chi(i) value is observed in any of the heating regimes. The electron thermal diffusivity (chi(e)) is correlated with the chi(i) value in PS and RS plasmas. Furthermore, the dependence of the ion thermal diffusivity on the radial electric field (E-r) shear has also been investigated. By considering the non-locality in the relation between the E-r shear and the chi(i) value, a threshold in the effective E-r shear to change the state from a weak to a strong ITB is identified. C1 Japan Atom Energy Res Inst, Naka Fus Res Estab, Ibaraki 3110193, Japan. Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08544 USA. RP Sakamoto, Y (reprint author), Japan Atom Energy Res Inst, Naka Fus Res Estab, Ibaraki 3110193, Japan. EM sakamoty@fusion.naka.jaeri.go.jp RI Kikuchi, Mitsuru/O-1036-2015 OI Kikuchi, Mitsuru/0000-0002-5485-8737 NR 29 TC 23 Z9 23 U1 1 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD AUG PY 2004 VL 44 IS 8 BP 876 EP 882 AR PII S0029-5515(04)82002-7 DI 10.1088/0029-5515/44/8/006 PG 7 WC Physics, Fluids & Plasmas SC Physics GA 855DX UT WOS:000223954400006 ER PT J AU Maingi, R Watkins, JG Mahdavi, MA Colchin, RJ AF Maingi, R Watkins, JG Mahdavi, MA Colchin, RJ TI Neutral pressure dynamics in the upper plenums in the DIII-D tokamak SO NUCLEAR FUSION LA English DT Article ID PARTICLE EXHAUST; ASDEX UPGRADE; DIVERTOR; DISCHARGES; RETENTION; PUMP AB We present the dependence of the neutral pressure rise on strike point geometry in the inner and outer plenums of the upper divertor in the DIII-D tokamak. The upper outer plenum pressure increases in the proximity of the plenum opening in a manner similar to previous reports of the lower outer plenum pressure. The inner plenum pressure measurement is modulated up to a factor of two by edge-localized modes (ELMs) particle flux, due to the small plenum volume and resulting short equilibration time constant. Reasonable agreement is obtained between the measured dependence of the outer plenum pressure on strike point position and simulations with an analytic neutral transport model, using the time-averaged (i.e. long compared with the ELM period) divertor profiles as inputs. The modelling of inner plenum pressure data with time-averaged profiles traces through the middle of the data range. In addition, modelling with two other sets of profiles, one averaged in the vicinity of ELMs and the other between ELMs, covers the upper and lower envelopes of the data. These new data sets represent an independent test and the agreement confirms that the basic physics in the model is responsible for the dependence of pressure rise on strike point geometry in the long mean free path limit. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Gen Atom Co, San Diego, CA USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Maingi, R (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM rmaingi@pppl.gov NR 19 TC 4 Z9 4 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD AUG PY 2004 VL 44 IS 8 BP 909 EP 916 AR PII S0029-5515(04)82417-7 DI 10.1088/0029-5515/44/8/009 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 855DX UT WOS:000223954400009 ER PT J AU Behre, C Benson, S Biallas, G Boyce, J Curtis, C Douglas, D Dyalla, HF Dillon-Townes, L Evans, R Grippo, A Gubeli, J Hardy, D Heckman, J Hernandez-Garcia, C Hiatt, T Jordan, K Merminga, L Neil, G Preble, J Rutt, H Shinn, M Siggins, T Toyokawa, H Waldman, DW Walker, R Wilson, N Yunn, B Zhang, S AF Behre, C Benson, S Biallas, G Boyce, J Curtis, C Douglas, D Dyalla, HF Dillon-Townes, L Evans, R Grippo, A Gubeli, J Hardy, D Heckman, J Hernandez-Garcia, C Hiatt, T Jordan, K Merminga, L Neil, G Preble, J Rutt, H Shinn, M Siggins, T Toyokawa, H Waldman, DW Walker, R Wilson, N Yunn, B Zhang, S TI First lasing of the IR upgrade FEL at Jefferson lab SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE high power; undulators ID OPTICAL KLYSTRON AB We report initial lasing results from the IR Upgrade FEL at Jefferson Lab (Proceedings: 2001 Particle Accelerator Conference, IEEE, Piscataway, NJ, 2001). The electron accelerator was operated with low average current beam at 80 MeV. The time structure of the beam was 120 pC bunches at 4.678 MHz with up to 750 mus pulses at 2 Hz. Lasing was established over the entire wavelength range of the mirrors (5.5-6.6 mum). The detuning curve length, turn-on time, and power were in agreement with modeling results assuming a 1 ps FWHM micropulse. The same model predicts over 10 kW of power output with 10 mA of beam and 10% output coupling, which is the ultimate design goal of the IR Upgrade FEL. The behavior of the laser while the dispersion section strength was varied was found to qualitatively match predictions. Initial CW lasing results also will be presented. (C) 2004 Elsevier B.V. All rights reserved. C1 Jefferson Lab, TJNAF, Newport News, VA 23606 USA. Univ Southampton, Southampton, Hants, England. Natl Lab High Energy Phys, KEK, Tsukuba, Ibaraki 305, Japan. RP Benson, S (reprint author), Jefferson Lab, TJNAF, MS 6A,12000 Jefferson Ave, Newport News, VA 23606 USA. EM felman@jlab.org OI EVANS, ROBIN/0000-0002-7988-3189 NR 4 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 19 EP 22 DI 10.1016/j.nima.2004.04.010 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700006 ER PT J AU Huang, Z Krinsky, S AF Huang, Z Krinsky, S TI Femtosecond X-ray pulses from a frequency-chirped SASE FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE femtosecond X-ray; frequency-chirped self-amplified spontaneous emission ID FREE-ELECTRON LASER; GENERATION AB We discuss the temporal and spectral properties of self-amplified spontaneous emission (SASE) utilizing an energy-chirped electron beam. A short temporal pulse is generated by using a monochromator to select a narrow radiation bandwidth from the frequency-chirped SASE. For the filtered radiation, the minimum pulse length is limited by the intrinsic SASE bandwidth, while the number of modes and the energy fluctuation can be controlled through the monochromator bandwidth. Two cases are considered: (1) placing the monochromator at the end of a single long undulator; (2) placing the monochromator after an initial undulator and amplifying the short-duration output in a second undulator. We analyze these cases and show that tens of femtosecond X-ray pulses may be generated for the linac coherent light source. (C) 2004 Elsevier B.V. All rights reserved. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Huang, Z (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM zrh@slac.stanford.edu NR 18 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 28 EP 33 DI 10.1016/j.nima.2004.04.012 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700008 ER PT J AU Krinsky, S AF Krinsky, S TI Saturation of a high-gain single-pass FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE FEL saturation; perturbation expansion; Pade approximate ID FREE-ELECTRON LASER AB We study a perturbation expansion for the solution of the nonlinear one-dimensional FEL equations. We show that in the case of a monochromatic wave, the radiated intensity satisfies a scaling relation that implies, for large distance z traveled along the undulator, a change in initial value of the radiation field corresponds to a translation in z (lethargy). Analytic continuation using Pade approximates yields accurate results for the radiation field early in saturation. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Krinsky, S (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, Bldg 725B, Upton, NY 11973 USA. EM krinsky@bnl.gov NR 9 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 52 EP 55 DI 10.1016/j.nima.2004.04.017 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700013 ER PT J AU Nguyen, DC Colestock, PL Kurennoy, SS Rees, DE Regan, AH Russell, S Schrage, DL Wood, RL Young, LM Schultheiss, T Christina, V Cole, M Rathke, J Shaw, J Eddy, C Holm, R Henry, R Yater, J AF Nguyen, DC Colestock, PL Kurennoy, SS Rees, DE Regan, AH Russell, S Schrage, DL Wood, RL Young, LM Schultheiss, T Christina, V Cole, M Rathke, J Shaw, J Eddy, C Holm, R Henry, R Yater, J TI Overview of the 100 mA average-current RF photoinjector SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE FEL; photoinjector; high current; high brightness; cw; photocathode ID INJECTOR; DRIVEN; GUN; FEL AB High-average-power FELs require high-current, low-emittance and low-energy-spread electron beams. These qualities have been achieved with RF photoinjectors operating at low-duty factors. To date, a high-average-current RF photoinjector operating continuously at 100% duty factor is yet to be demonstrated. The principal challenges of a high-duty-factor normal-conducting RF photoinjector are related to applying a high accelerating gradient continuously, thus generating large ohmic losses in the cavity walls, cooling the injector cavity walls and the high-power RF couplers, and finding a photocathode with reasonable Q.E. that can survive the poor vacuum of the RF photoinjector. We present the preliminary design of a normal-conducting 700 MHz photoinjector with solenoid magnetic fields for emittance compensation. The photoinjector is designed to produce 2.7 MeV electron beams at 3 nC bunch charge and 35 MHz repetition rate (100 mA average current). The photoinjector consists of a 2-1/2-cell, pi-mode, RF cavity with on-axis electric coupling, and a non-resonant vacuum plenum. Heat removal in the resonant cells is achieved via dense arrays of internal cooling passages capable of handling high-velocity water flows. Megawatt RF power is coupled into the injector through two tapered ridge-loaded waveguides. PARMELA simulations show that the 2 1/2-cell injector can produce a 7 mum emittance directly. Transverse plasma oscillations necessitate additional acceleration and a second solenoid to realign the phase space envelopes of different axial slices at higher energy, resulting in a normalized rms emittance of 6.5 mum and 34 keV rms energy spread. We are developing a novel cesiated p-type GaN photocathode with 7% quantum efficiency at 350 ran and a cesium dispenser to replenish the cathode with cesium through a porous silicon carbide substrate. These performance parameters will be necessary for the design of the 100 kW FEL. (C) 2004 Published by Elsevier B.V. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Adv Energy Syst, Medford, NY 11763 USA. USN, Res Lab, Washington, DC USA. RP Nguyen, DC (reprint author), Los Alamos Natl Lab, MS H851, Los Alamos, NM 87545 USA. EM dcnguyen@lanl.gov OI Kurennoy, Sergey/0000-0003-2854-9647 NR 10 TC 15 Z9 15 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 71 EP 77 DI 10.1016/j.nima.2004.04.021 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700017 ER PT J AU Lumpkin, AH Lewellen, JW Berg, WJ Chae, YC Dejus, RJ Erdmann, M Li, Y Milton, SV Rule, DW AF Lumpkin, AH Lewellen, JW Berg, WJ Chae, YC Dejus, RJ Erdmann, M Li, Y Milton, SV Rule, DW TI On-line SASE FEL gain optimization using COTRI imaging SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE free-electron lasers; coherent optical transition radiation; microbunching; beam overlap AB Overlap of the particle and the photon beams in a self-amplified spontaneous emission (SASE) free-electron laser (FEL) is one of the keys to optimizing gain. We have now directly demonstrated an on-line method for gain improvement at 540 nm on the Advanced Photon Source FEL. This was achieved by steering the e-beam with correctors before an undulator based on the fringe symmetry in coherent optical transition radiation interference (COTRI) images observed after that undulator. For these conditions we determined that both the SASE and COTR image intensities were improved by about a factor of three in one 2.4-m-long undulator section. The initial tuning had been based on RF beam position monitor readings and the maximization of SASE image intensity in the cameras. Published by Elsevier B.V. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, Bldg 401,9700 S Cass Ave, Argonne, IL 60439 USA. EM lumpkin@aps.anl.gov NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 179 EP 183 DI 10.1016/j.nima.2004.04.042 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700038 ER PT J AU Loos, H Bolton, PR Clendenin, JE Dowell, DH Gierman, SM Limborg, CG Schmerge, JF Shaftan, TV Sheehy, B AF Loos, H Bolton, PR Clendenin, JE Dowell, DH Gierman, SM Limborg, CG Schmerge, JF Shaftan, TV Sheehy, B TI Longitudinal phase space tomography at the SLAC gun test facility and the BNL DUV-FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE relativistic electron beams; beam dynamics; tomography AB The Gun Test Facility and the accelerator at the DUV-FEL facility are operated as sources for high brightness electron beams; the first for the Linac Coherent Light Source project and the latter driving an FEL using High Gain Harmonic Generation in the UV. For both accelerators, projections of the longitudinal phase space on the energy coordinate were obtained by varying the phase of an accelerating structure after the gun and measured with a downstream spectrometer dipole. Using an algebraic reconstruction technique, the longitudinal phase space at the entrance to the varied accelerating structure could be reconstructed over a large range of charge from 15 to 600 pC. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Loos, H (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. EM toos@bnl.gov RI Shaftan, Timur/A-8443-2009; OI Loos, Henrik/0000-0001-5085-0562 NR 6 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 189 EP 193 DI 10.1016/j.nima.2004.04.044 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700040 ER PT J AU Lumpkin, AH Erdmann, M Lewellen, JW Chae, YC Dejus, RJ Den Hartog, P Li, Y Milton, SV Rule, DW Wiemerslage, G AF Lumpkin, AH Erdmann, M Lewellen, JW Chae, YC Dejus, RJ Den Hartog, P Li, Y Milton, SV Rule, DW Wiemerslage, G TI First observations of COTR due to a microbunched beam in the VUV at 157 nm SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE SASE FEL; VUV; coherent optical transition radiation; microbunching ID SASE FEL AB The self-amplified spontaneous emission free-electron laser experiments at the Advanced Photon Source are now operating in the VUV at 157 nm for a user experiment. In conjunction with these runs, we have obtained the first coherent optical transition radiation data due to the microbunching of the electron beam in the VUV. We have used both near- and far-field focusing by selecting the spherical mirror with the appropriate focal length for the distance to the CCD chip. The optics are such that much higher resolution than our visible system is attained with calibration factors of 11 mum/pixel and 10 murad/pixel, respectively. Localized effects in the distributions in both focal conditions are being addressed. Published by Elsevier B.V. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60349 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, Bldg 401,9700 S Cass Ave, Argonne, IL 60349 USA. EM lumpkin@aps.anl.gov NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 194 EP 198 DI 10.1016/j.nima.2004.04.045 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700041 ER PT J AU Kurennoy, SS Nguyen, DC Young, LM AF Kurennoy, SS Nguyen, DC Young, LM TI Waveguide-coupled cavities for energy recovery linacs SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE FEL; energy recovery; CW; high current; high power ID FREE-ELECTRON LASER AB A novel scheme for energy recovery linacs used as FEL drivers is proposed. It consists of two parallel beam lines, one for electron beam acceleration and the other for the used beam that is bent after passing through a wiggler. The used beam is decelerated by the structure and feeds the cavity fields. The main feature of the scheme is that RF cavities are coupled with waveguides between these two linacs. The waveguide cut through the two beam pipes provides an efficient mechanism for energy transfer. The superconducting RF cavities in the two accelerators can be shaped differently, with an operating mode at the same frequency. This provides HOM detuning and therefore reduces the beam break-up effects. Another advantage of the proposed two-beam scheme is easy tuning of the cavity coupling by changing the waveguide length. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kurennoy, SS (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM kurennoy@lanl.gov OI Kurennoy, Sergey/0000-0003-2854-9647 NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 220 EP 224 DI 10.1016/j.nima.2004.04.051 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700047 ER PT J AU Dowell, DH Ferrario, M Kimura, T Lewellen, J Limborg, C Raimondi, P Schmerge, JF Serafini, L Smith, T Young, L AF Dowell, DH Ferrario, M Kimura, T Lewellen, J Limborg, C Raimondi, P Schmerge, JF Serafini, L Smith, T Young, L TI A two-frequency RF photocathode gun SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE electron beam; photocathode RF gun; RF harmonics; emittance AB in this paper we resurrect an idea originally proposed by Serafini (Nucl. Instr. and Meth. A 318 (1992) 301) in 1992 for an RF photocathode gun capable of operating simultaneously at the fundamental frequency and a higher frequency harmonic. Driving the gun at two frequencies with the proper field ratio and relative phase produces a beam with essentially no RF emittance and a linear longitudinal phase space distribution. Such a gun allows a completely new range of operating parameters for controlling space charge emittance growth. In addition, the linear longitudinal phase space distribution aids in bunch compression. This paper will compare results of simulations for the two-frequency gun with the standard RF gun and the unique properties of the two-frequency gun will be discussed. (C) 2004 Elsevier B.V. All rights reserved. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. INFN Franscati, I-00040 Monte Porzio Catone, Italy. Stanford Univ, Hansen Labs, Stanford, CA 94305 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. INFN Milan LASA, I-20090 Segrate, MI, Italy. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Dowell, DH (reprint author), Stanford Linear Accelerator Ctr, Mail Stop 18,2575 San Hill Rd, Menlo Pk, CA 94025 USA. EM dowell@slac.stanford.edu NR 4 TC 10 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 316 EP 320 DI 10.1016/j.nima.2004.04.078 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700067 ER PT J AU Huang, Z Shaftan, T AF Huang, Z Shaftan, T TI Impact of beam energy modulation on rf zero-phasing microbunch measurements SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE rf zero-phasing; space-charge oscillation; high-brightness electron beam AB Temporal profile of a simple bunch distribution may be obtained by measuring the horizontal density profile of an energy-chirped electron beam at a dispersive region using the rf zero-phasing technique. For an energy-modulated beam, the horizontal profile obtained by this technique is also modulated with an enhanced amplitude. We study the microbunching experiment at the NSLS source development laboratory and show that the horizontal modulation observed by the rf zero-phasing technique can be explained by the space-charge-induced energy modulation in the accelerator. (C) 2004 Elsevier B.V. All rights reserved. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Huang, Z (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM zrh@slac.stanford.edu RI Shaftan, Timur/A-8443-2009 NR 14 TC 4 Z9 4 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 345 EP 349 DI 10.1016/j.nima.2004.04.065 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700073 ER PT J AU Limborg, C Bolton, P Dowell, DH Glerman, S Schmerge, JF AF Limborg, C Bolton, P Dowell, DH Glerman, S Schmerge, JF TI Sensitivity studies for the LCLS photoinjector bearaline SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE photoinjector; stability; wakefield AB The LCLS photoinjector beamline is now in the Design and Engineering stage. The fabrication and installation of this beamline is scheduled for the summer 2006. The photoinjector will deliver 10 ps long electron bunches of 1 nC with a normalized transverse emittance of less than 1 mm mrad for 80% of the slices constituting the core of the bunch at 150 MeV. Based on PARMELA simulations, stability requirements for all the physical parameters were derived. In this paper, we discuss the regulation requirements of the solenoid fields, accelerating fields and the phase stability of RF components. We also describe how specifications for the laser pulse were defined, in particular for the longitudinal and transverse uniformities. Finally, requirements for alignment of components and steering of the electron beam along the beamline are presented. (C) 2004 Elsevier B.V. All rights reserved. C1 SLAC, Menlo Pk, CA 94025 USA. RP Schmerge, JF (reprint author), SLAC, MS 69,2275 Sand Hill Rd, Menlo Pk, CA 94025 USA. EM schmerge@slac.stanford.edu NR 5 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 350 EP 354 DI 10.1016/j.nima.2004.04.066 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700074 ER PT J AU Kurennoy, SS Schrage, DL Wood, RL Young, LM Schultheiss, T Christina, V Rathke, J AF Kurennoy, SS Schrage, DL Wood, RL Young, LM Schultheiss, T Christina, V Rathke, J TI Development of photoinjector RF cavity for high-power CWFEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE FEL; photoinjector; high current; high brightness; CW AB An RF photoinjector capable of producing high continuous average current with low emittance and energy spread is a key enabling technology for high-power CW FEL. A preliminary design of the first, and the most challenging, section of a 700-MHz CW RF normal-conducting photoinjector-a 2.5-cell, pi-mode cavity with solenoidal magnetic field for emittance compensation-is completed. Beam dynamics simulations demonstrate that this cavity with an electric field gradient of 7 MV/m will produce an electron beam at 2.7 MeV with the transverse rms emittance 7 turn mrad at 3 nC of charge per bunch. Electromagnetic field computations combined with a thermal and stress analysis show that the challenging problem of cavity cooling can be successfully resolved. We are in the process of building a 100-mA (3 nC of bunch charge at 33.3 MHz bunch repetition rate) photoinjector for demonstration purposes. Its performance parameters will enable a robust 100-kW-class FEL operation with electron beam energy below 100 MeV. The design is scalable to higher power levels by increasing the electron bunch repetition rate and provides a path to a MW-class amplifier FEL. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Adv Energy Syst, Medford, NY 11763 USA. RP Kurennoy, SS (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM kurennoy@lanl.gov OI Kurennoy, Sergey/0000-0003-2854-9647 NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 392 EP 396 DI 10.1016/j.nima.2004.04.087 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700082 ER PT J AU Shaftan, T Huang, Z Carr, L Doyuran, A Graves, WS Limborg, C Loos, H Rose, J Sheehy, B Wu, Z Yu, LH AF Shaftan, T Huang, Z Carr, L Doyuran, A Graves, WS Limborg, C Loos, H Rose, J Sheehy, B Wu, Z Yu, LH TI Experiments with electron beam modulation at the DUVFEL accelerator SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE electron beam; collective effects; energy spectrum AB Recently strong modulation of the electron bunch longitudinal phase space was obtained in the DUVFEL accelerator at NSLS. The chirped beam energy spectra exhibit a spiky structure with a subpicosecond spike separation. A model based on the longitudinal space-charge effect has been suggested as an explanation of the observed effect. For characterization of the structure and comparison with the model we performed several experiments. In this paper we present experimental data and discuss them in relation to the model. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. SLAC, Menlo Pk, CA 94025 USA. MIT Bates, Middleton, MA 01949 USA. RP Shaftan, T (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. EM shaftan@bnl.gov RI Shaftan, Timur/A-8443-2009; OI Loos, Henrik/0000-0001-5085-0562 NR 9 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 397 EP 401 DI 10.1016/j.nima.2004.04.119 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700083 ER PT J AU Yu, LH Doyuran, A DiMauro, L Graves, WS Johnson, ED Heese, R Krinsky, S Loos, H Murphy, JB Rakowsky, G Rose, J Shaftan, T Sheehy, B Skaritka, J Wang, XJ Wu, Z AF Yu, LH Doyuran, A DiMauro, L Graves, WS Johnson, ED Heese, R Krinsky, S Loos, H Murphy, JB Rakowsky, G Rose, J Shaftan, T Sheehy, B Skaritka, J Wang, XJ Wu, Z TI Ultraviolet high-gain harmonic-generation free-electron laser at BNL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE free-electron laser; high-gain harmonic-generation ID DUV-FEL; SASE; RADIATION AB We report the first experimental results on a high-gain harm onic-generation (HGHG) free-electron laser (FEL) operating in the ultraviolet. An 800 nm seed from a Ti-Sapphire laser has been used to produce saturated amplified output at the 266 nm third-harmonic. The results confirm the advantages of the HGHG FEL: stable central wavelength, narrow bandwidth and small pulse energy fluctuation. The harmonic output at 88 nm, which accompanies the 266 nm radiation, has been used in an ion pair imaging experiment in chemistry. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, AFT, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Yu, LH (reprint author), Brookhaven Natl Lab, AFT, Natl Synchrotron Light Source, Bldg 725C,Box 5000, Upton, NY 11973 USA. EM lhyu@bnl.gov RI Shaftan, Timur/A-8443-2009; OI Loos, Henrik/0000-0001-5085-0562 NR 25 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 436 EP 442 DI 10.1016/j.nima.2004.04.127 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700091 ER PT J AU Biedron, SG Freund, HP Milton, SV Dattoli, G Renieri, A Ottaviani, PL AF Biedron, SG Freund, HP Milton, SV Dattoli, G Renieri, A Ottaviani, PL TI Evolution of transverse modes in a high-gain free-electron laser SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE free-electron lasers; harmonic generation; frequency conversion; intense particle beams and radiation sources; coherence ID HARMONIC-GENERATION AB At the point of saturation in a high-gain free-electron laser (FEL) the light is fully transversely coherent. The number and evolution of the transverse modes is important for the effective tune-up and subsequent operation of FELs based on the photon beam characterization and in designing multi-module devices that rely on relatively stable saturation distances in each module. In the latter, this is particularly critical since each section will seed another module. Overall, in a single- or multi-module device, experimental users will desire stability in power and in photon beam quality. Using a numerical simulation code, the evolution of the transverse modes in the high-gain free-electron laser (FEL) is examined and is discussed. In addition, the transverse modes in the first few higher nonlinear harmonics are investigated. (C) 2004 Elsevier B.V. All rights reserved. C1 Lund Univ, MAX Lab, SE-22100 Lund, Sweden. Sci Applicat Int Corp, Mclean, VA 22102 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. Ctr Ric Frascati, Unite Tecn Sci Tecnol Fis Applicate, ENEA, I-00044 Frascati, Rome, Italy. Ctr Ric E Clementel, Div Fis Applicata, ENEA, Bologna, Italy. RP Biedron, SG (reprint author), Lund Univ, MAX Lab, SE-22100 Lund, Sweden. EM sgbiedron@elementaero.com NR 7 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 443 EP 447 DI 10.1016/j.nima.2004.04.128 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700092 ER PT J AU Dohlus, M Flottmann, K Kozlov, OS Limberg, T Piot, P Saldin, EL Schneidmiller, EA Yurkov, MV AF Dohlus, M Flottmann, K Kozlov, OS Limberg, T Piot, P Saldin, EL Schneidmiller, EA Yurkov, MV TI Start-to-end simulations of SASE FEL at the TESLA Test Facility, Phase 1: comparison with experimental results SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE free electron lasers; X-ray lasers; relativistic electron beams ID FREE-ELECTRON LASER; RADIATION AB VUV SASE FEL at the TESLA Test Facility (Phase 1) was successfully running and reached saturation in the wavelength range 80-120 nm. We present a posteriori start-to-end simulations of this machine. The codes Astra and elegant are used to track particle distribution from the cathode to the undulator entrance. An independent simulation of the beam dynamics in the bunch compressor is performed with the code CSRtrack. SASE FEL process is simulated with the code FAST. Simulation results are in a good agreement with the measured properties of SASE FEL radiation. (C) 2004 Elsevier B.V. All rights reserved. C1 DESY, D-22607 Hamburg, Germany. Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Schneidmiller, EA (reprint author), DESY, Notkestr 85, D-22607 Hamburg, Germany. EM schneidm@mail.desy.de NR 9 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 448 EP 452 DI 10.1016/j.nima.2004.04.129 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700093 ER PT J AU Emma, P Huang, Z AF Emma, P Huang, Z TI Femtosecond X-ray pulses from a spatially chirped electron bunch in a SASE FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE femtosecond X-ray; spatially chirped electron bunch; self-amplified spontaneous emission AB We propose a simple method to produce short X-ray pulses using a spatially chirped electron bunch in a SASE FEL. The spatial chirp is generated using an RF deflector which produces a transverse offset (in y and/or y) correlated. with the longitudinal bunch position. Since the FEL gain is very sensitive to an initial offset in the transverse phase space at the entrance of the undulator, only a small portion of the electron bunch with relatively small transverse offset will interact significantly with the radiation, resulting in an X-ray pulse length much shorter than the electron bunch length. The X-ray pulse is also naturally phase locked to the RF deflector and so allows high precision timing synchronization. We discuss the generation and transport of such a spatially chirped electron beam and show that tens of femotsecond long pulse can be generated for the linac coherent light source. (C) 2004 Elsevier B.V. All rights reserved. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Huang, Z (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM zrh@slac.stanford.edu NR 4 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 458 EP 462 DI 10.1016/j.nima.2004.04.131 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700095 ER PT J AU Agustsson, R Andonian, G Babzien, M Ben-Zvi, I Frigola, P Huang, J Murokh, A Palumbo, L Pellegrini, C Reiche, S Rosenzweig, J Travish, G Vicario, C Yakimenko, V AF Agustsson, R Andonian, G Babzien, M Ben-Zvi, I Frigola, P Huang, J Murokh, A Palumbo, L Pellegrini, C Reiche, S Rosenzweig, J Travish, G Vicario, C Yakimenko, V TI Chirped pulse amplification at VISA-FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE short pulse; SASE FEL ID FREE-ELECTRON LASER AB Chirped beam manipulations are of the great interest to the free electron laser (FEL) community as potential means of obtaining ultra short X-ray pulses. The experiment is under way at the accelerator test facility (ATF) at Brookhaven National Laboratory (BNL) to study the FEL process limits with the under-compressed chirped electron beam. High gain near-saturation SASE operation was achieved with the strongly chirped beam (similar to2.8% head-to-tail). The measured beam dynamics and SASE properties are presented, as well as the design parameters for the next round of experiment utilizing the newly installed UCLA/ATF chicane compressor. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Los Angeles, Dept Phys Astron, Los Angeles, CA 90095 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Phoang Accelerator Lab, Pohang, South Korea. Univ Roma La Sapienza, Rome, Italy. RP Murokh, A (reprint author), Univ Calif Los Angeles, Dept Phys Astron, 405 Hilgard Ave, Los Angeles, CA 90095 USA. EM murokh@physics.ucla.edu RI Travish, Gil/H-4937-2011 OI Travish, Gil/0000-0002-4787-0949 NR 10 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 463 EP 466 DI 10.1016/j.nima.2004.04.132 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700096 ER PT J AU Doyuran, A DiMauro, L Graves, W Heese, R Johnson, ED Krinsky, S Loos, H Murphy, JB Rakowsky, G Rose, J Shaftan, T Sheehy, B Shen, YZ Skaritka, J Wang, XJ Wu, ZL Yu, LH AF Doyuran, A DiMauro, L Graves, W Heese, R Johnson, ED Krinsky, S Loos, H Murphy, JB Rakowsky, G Rose, J Shaftan, T Sheehy, B Shen, YZ Skaritka, J Wang, XJ Wu, ZL Yu, LH TI Chirped pulse amplification of HGHG-FEL at DUV-FEL facility at BNL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE CPA; FEL; HGHG; seed laser; accelerator; high gain AB The DUV-FEL facility has been in operation in the High Gain Harmonic Generation (HGHG) mode producing a 266-nm output from 177-MeV electrons for 1 year. In this paper, we present preliminary results of the Chirped Pulse Amplification (CPA) of the HGHG radiation. In the normal HGHG process, a 1-ps electron beam is seeded by a chirped 9 ps long, 800-nm Ti:Sapphire laser. The electron beam sees only a narrow fraction of the seed laser bandwidth. However, in the CPA case, the seed laser pulse length is reduced to 1 ps, and the electron beam sees the full bandwidth. We introduce an energy chirp on the electron beam to match the chirp of the seed pulse, enabling the resonant condition for the whole beam. We present measurements of the spectrum bandwidth for various chirp conditions. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. MIT, Bates Linear Accelerator Ctr, Middleton, MA 01949 USA. RP Doyuran, A (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. EM doyuran@physics.ucla.edu RI Shaftan, Timur/A-8443-2009; OI Loos, Henrik/0000-0001-5085-0562 NR 4 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 467 EP 470 DI 10.1016/j.nima.2004.04.133 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700097 ER PT J AU Yu, LH Yi, HW AF Yu, LH Yi, HW TI Accurate synchronization between short laser pulse and electron bunch using HGHG output at 266 nm as photo-cathode laser for RF-gun SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE free electron laser AB We report a new scheme to realize accurate synchronization between the electron bunch and seed laser by using HGHG output at 266 nm as photo-cathode laser for the RF gun. One by-product of this method is the reduction of the energy fluctuation in addition to the reduced time jitter. (C) 2004 Published by Elsevier B.V. C1 Brookhaven Natl Lab, ATF, Natl Synchrotron Light Source, Upton, NY 11973 USA. Changchun Univ Sci & Technol, Coll Sci, Dept Phys, Changchun 130022, Peoples R China. RP Yu, LH (reprint author), Brookhaven Natl Lab, ATF, Natl Synchrotron Light Source, Bldg 725C,Box 5000, Upton, NY 11973 USA. EM lhyu@bnl.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 481 EP 485 DI 10.1016/j.nima.2004.04.136 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700100 ER PT J AU Travish, G Crane, JK Tremaine, A AF Travish, G Crane, JK Tremaine, A TI Free-electron lasers as pumps for high-energy solid-state lasers SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 25th International Free-Electron Laser Conference/10th Free-Electron Laser Users Workshop* CY 2003 CL Epochal Tsukuba, Tsukuba, JAPAN SP FEL Lab, Adv Photon Res Ctr, Kansai Res Establishment, Japan Atomic Energy Res Inst HO Epochal Tsukuba DE lasers; FEL; pump; high energy; high power AB High average-power free-electron lasers may be useful for pumping high peak-power solid-state laser-amplifiers. At very high peak-powers, the pump source for solid-state lasers is non-trivial: flash lamps produce thermal problems and are unsuitable for materials with short florescence-times, while diodes can be expensive and are only available at select wavelengths. FELs can provide pulse trains of light tuned to a laser material's absorption peak, and florescence lifetime. An FEL pump can thus minimize thermal effects and potentially allow for new laser materials to be used. This paper examines the design of a high average-power, efficient high-gain FEL for use as pump source. Specifically, the cases of a 100J class pump, and a 100 TW-class laser at a planned fourth-generation light-source are considered. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Travish, G (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. EM gil.tavish@physics.ucla.edu RI Travish, Gil/H-4937-2011 OI Travish, Gil/0000-0002-4787-0949 NR 15 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 2004 VL 528 IS 1-2 BP 525 EP 529 DI 10.1016/j.nima.2004.04.094 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 847QJ UT WOS:000223409700109 ER PT J AU Ognibene, TJ Bench, G Brown, TA Vogel, JS AF Ognibene, TJ Bench, G Brown, TA Vogel, JS TI The LLNL accelerator mass spectrometry system for biochemical C-14-measurements SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE accelerator mass spectrometry; biochemical C-14 quantification; tritium; charged-particle beams ID C-14; AMS; SAMPLES AB We report on recent improvements made to our 1 MV accelerator mass spectrometry system that is dedicated to C-14 quantification of biochemical samples. Increased vacuum pumping capacity near the high voltage terminal has resulted in a two-fold reduction of system backgrounds to 0.04 amol C-14/Mg carbon. Carbon ion transmission through the accelerator has also improved a few percent. We have also developed tritium measurement capability on this spectrometer. The H-3/H-1 isotopic ratio of a milligram-sized processed tap water sample has been measured at 4+/-1x10(-16) (430+/-10 muBq/mg H). Measurement throughput for a typical biochemical H-3 sample is estimated to be similar to10 min/sample. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RP Ognibene, TJ (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, POB 808,L-397,7000 East Ave, Livermore, CA 94550 USA. EM ognibene@llnl.gov NR 13 TC 9 Z9 9 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 12 EP 15 DI 10.1016/j.nimb.2004.04.006 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300004 ER PT J AU Hausladen, PA Beene, JR Galindo-Uribarri, A Liang, JF Radford, DC Shapira, D AF Hausladen, PA Beene, JR Galindo-Uribarri, A Liang, JF Radford, DC Shapira, D TI Measuring the mass of fission fragments using the HRIBF 25-MV tandem accelerator SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE nuclear masses; radioactive ion beams ID SECONDARY-ELECTRON EMISSION; POSITION AB A method whereby mass differences can be measured using the 25-MV tandem accelerator at the Holifield radioactive ion beam facility (HRIBF) is presented. The technique is unconventional in that mass differences will be measured as position differences at the image of the energy-analyzing magnet following the accelerator and will be made at energies where independent isobaric determination will be possible by a DeltaE measurement. The technique is appropriate where the unknown mass is the most neutron-rich isobaric constituent of the beam, such as for neutron-rich fission fragments. (C) 2004 Elsevier B.V. All rights reserved. C1 Oak Ridge Natl Lab, Dept Phys, Oak Ridge, TN 37831 USA. RP Hausladen, PA (reprint author), Oak Ridge Natl Lab, Dept Phys, POB 2008, Oak Ridge, TN 37831 USA. EM hauslade@mail.phy.ornl.gov RI radford, David/A-3928-2015 NR 5 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 176 EP 179 DI 10.1016/j.nimb.2004.04.036 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300034 ER PT J AU Bogen, KT Marchetti, AA Brown, TA AF Bogen, KT Marchetti, AA Brown, TA TI Use of a correlated compound-binomial model to assess absence of non-counting noise in Pu-isotope ratios measured by AMS at LLNL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE dead time; dependent-multinomial or trinomial samples; error analysis; estimation; missing or partial categorical data; plutonium ID ACCELERATOR MASS-SPECTROMETRY; PARAMETER-N; INFERENCE; INTERVALS AB Methods for error analysis pertaining to isotopic ratio measures made by accelerator mass spectrometry (AMS) typically focus on accuracy/precision of detected counts of a single rare isotope (e.g. C-14), relative to a current strength indicating the abundance of an isotope present in far greater amounts (e.g. C-13). Because AMS analysis of the relative abundance of actinide isotopes involves comparing detected counts that each correspond to a relatively rarely occurring isotope, error analysis is complicated by correlations between isotope-specific counts and by isotope-specific dead times, that affect each pair of isotope-specific counts. A new method of error analysis described here was developed specifically to estimate and characterize error in AMS measures of actinide isotope ratios. The method models a series of detected pairs of isotope counts as correlated compound-binomial (censored trinomial contingency) data, provides an approximately unbiased moment-method estimator of a common isotopic proportion (or ratio) corresponding to any data-pair series, and provides a corresponding homogeneity test for isotopic proportions observed within any data-pair series. Applications of this method to AMS measures of the relative abundance of plutonium isotopes, in samples analyzed at the Lawrence Livermore National Laboratory Center for AMS, revealed that observed measurement errors were nearly all attributable to modeled counting errors. Published by Elsevier B.V. C1 Lawrence Livermore Natl Lab, Hlth & Ecol Assessment Div, Livermore, CA 94550 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA USA. RP Bogen, KT (reprint author), Lawrence Livermore Natl Lab, Hlth & Ecol Assessment Div, 700 E Ave, Livermore, CA 94550 USA. EM bogen@llnl.gov NR 30 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 209 EP 215 DI 10.1016/j.nimb.2004.04.043 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300041 ER PT J AU Yokoyama, Y Caffee, MW Southon, JR Nishiizumi, K AF Yokoyama, Y Caffee, MW Southon, JR Nishiizumi, K TI Measurements of in situ produced C-14 in terrestrial rocks SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE cosmogenic nuclides; in situ C-14 ID COSMOGENIC C-14 AB We developed and are testing a system for extracting in situ produced C-14 from quartz. C-14 is liberated from quartz matrix using step-wise heating during which time a spiked carrier gas consisting O-2-CO-CO2-He is flowed through the high-temperature chamber continuously. The total C-14 background is reproducible and typically (2.3 +/- 0.2) x 10(6) atoms, and the recovery is consistently greater than 90%. To validate the performance of the system and determine the blank level, we are using quartz samples taken from the Homestake mine (1600 m below the surface), South Dakota. To determine the C-14 release pattern and recovery, we used samples taken from the Transantarctic Mountains, Antarctica. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RP Yokoyama, Y (reprint author), Univ Tokyo, Dept Earth & Planetary Sci, Tokyo 1130033, Japan. EM yokoyama@eps.s.u-tokyo.ac.jp RI Yokoyama, Yusuke/N-9623-2013; Caffee, Marc/K-7025-2015; OI Caffee, Marc/0000-0002-6846-8967; Yokoyama, Yusuke/0000-0001-7869-5891 NR 13 TC 11 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 253 EP 258 DI 10.1016/j.nimb.2004.04.051 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300049 ER PT J AU Stone, J Fifield, K Beer, J Vonmoos, M Obrist, C Grajcar, M Kubik, P Muscheler, R Finkel, R Caffee, M AF Stone, J Fifield, K Beer, J Vonmoos, M Obrist, C Grajcar, M Kubik, P Muscheler, R Finkel, R Caffee, M TI Co-precipitated silver-metal oxide aggregates for accelerator mass spectrometry of Be-10 and Al-26 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE beryllium-10; aluminum-26; sample preparation ID AMS FACILITY AB We have developed a chemical co-precipitation method for producing conductive Ag-BeO and Ag-Al2O3 aggregates for Be-10 and Al-26 analyses. Co-precipitation offers a rapid alternative to grinding and mixing Be and Al oxides with Ag or Cu powder, and ensures that Al and Be oxide grains produced by baking are uniformly dispersed in the conductive Ag matrix. Co-precipitated aggregates are bulkier than pure oxides and require little or no grinding, hence samples containing significantly less than 250 mug of Be-9 can be manipulated and analysed, increasing the efficiency of Be-10 measurements. Binding BeO with Ag reduces the chance of hazardous BeO dust escaping during sample preparation. Although ion currents from co-precipitated Ag-BeO cathodes are lower than from mixed Nb-BeO, savings in preparation time may offset longer analysis times. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA. Australian Natl Univ, Res Sch Phys Sci & Engn, Dept Nucl Phys, Canberra, ACT 0200, Australia. EAWAG, CH-8600 Dubendorf, Switzerland. ETH, Paul Scherrer Inst, Eidgnoss Tech Hochsch Zurich, CH-8092 Zurich, Switzerland. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RP Stone, J (reprint author), Univ Washington, Dept Earth & Space Sci, Box 351310, Seattle, WA 98195 USA. EM stone@geology.washington.edu RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 7 TC 18 Z9 18 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 272 EP 277 DI 10.1016/j.nimb.2004.04.055 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300053 ER PT J AU Zermeno, P Kurdyla, DK Buchholz, BA Heller, SJ Kashgarian, M Frantz, BR AF Zermeno, P Kurdyla, DK Buchholz, BA Heller, SJ Kashgarian, M Frantz, BR TI Prevention and removal of elevated radiocarbon contamination in the LLNL/CAMS natural radiocarbon sample preparation laboratory SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE AMS; sample preparation; contamination ID AMS AB The presence of elevated C-14 contamination in a laboratory preparing samples for natural radiocarbon analysis is detrimental to the laboratory workspace as well as the research being conducted. Elevated C-14 contamination occurs via many different pathways, but procedures can be adopted to prevent and remove this type of contamination. In this paper we present our current practices for preventing contamination, evaluating and monitoring potential workspaces and cleaning contaminated workspaces and laboratory equipment. Published by Elsevier B.V. C1 Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. RP Zermeno, P (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, POB 808, Livermore, CA 94551 USA. EM zermeno1@llnl.gov RI Kashgarian, Michaele/E-1665-2011; Buchholz, Bruce/G-1356-2011 OI Kashgarian, Michaele/0000-0001-7824-8418; NR 4 TC 8 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 293 EP 297 DI 10.1016/j.nimb.2004.04.058 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300056 ER PT J AU Collon, P Bichler, M Caggiano, J Cecil, LD El Masri, Y Golser, R Jiang, CL Heinz, A Henderson, D Kutschera, W Lehmann, BE Leleux, P Loosli, HH Pardo, RC Paul, M Rehm, KE Schlosser, P Scott, RH Smethie, WM Vondrasek, R AF Collon, P Bichler, M Caggiano, J Cecil, LD El Masri, Y Golser, R Jiang, CL Heinz, A Henderson, D Kutschera, W Lehmann, BE Leleux, P Loosli, HH Pardo, RC Paul, M Rehm, KE Schlosser, P Scott, RH Smethie, WM Vondrasek, R TI Development of an AMS method to study oceanic circulation characteristics using cosmogenic Ar-39 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE Ar-39; accelerator mass spectrometry; ocean circulation AB Initial experiments at the ATLAS facility [Nucl. Instr. and Meth. B 92 (1994) 241] resulted in a clear detection of cosmogenic Ar-39 signal at the natural level. The present paper summarizes the recent developments of Ar-39 AMS measurements at ATLAS: the use of an electron cyclotron resonance (ECR) positive ion source equipped with a special quartz liner to reduce K-39 background, the development of a gas handling system for small volume argon samples, the acceleration of Ar-39(8+) ions to 232 MeV, and the final separation of Ar-39 from K-39 in a gas-filled spectrograph. The first successful AXIS measurements of Ar-39 in ocean water samples from the Southern Atlantic ventilation experiment (SAVE) are reported. Published by Elsevier B.V. C1 Columbia Univ, Lamont Doherty Geol Observ, Palisades, NY 10964 USA. Oesterreich Univ, Inst Atom, A-1020 Vienna, Austria. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Univ Catholique Louvain, Inst Phys Nucl, B-1348 Louvain, Belgium. Univ Vienna, Inst Isotopenforsch & Kernphys, Vienna Environm Res Accelerator, A-1090 Vienna, Austria. Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel. RP Collon, P (reprint author), Columbia Univ, Lamont Doherty Geol Observ, Palisades, NY 10964 USA. EM pcollon@ldeo.columbia.edu RI Schlosser, Peter/C-6416-2012; Heinz, Andreas/E-3191-2014 OI Schlosser, Peter/0000-0002-6514-4203; NR 8 TC 27 Z9 27 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 428 EP 434 DI 10.1016/j.nimb.2004.04.081 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300079 ER PT J AU Rugel, G Arazi, A Carroll, KL Faestermann, T Knie, K Korschinek, G Marchetti, AA Martinelli, RE McAninch, JE Ruhm, W Straume, T Wallner, A Wallner, C AF Rugel, G Arazi, A Carroll, KL Faestermann, T Knie, K Korschinek, G Marchetti, AA Martinelli, RE McAninch, JE Ruhm, W Straume, T Wallner, A Wallner, C TI Low-level measurement of Ni-63 by means of accelerator mass spectrometry SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE accelerator mass spectrometry; Ni-63; Hiroshima; copper ID HIROSHIMA ATOMIC-BOMB; AMS; MAGNET AB The radionuclide Ni-63 (T-1/2 = 100.1 a) has been proposed as a fluence monitor for fast neutrons in copper samples from Hiroshima. Accelerator mass spectrometry (AMS) represents a powerful tool for the detection of this radionuclide, provided the isobaric interference of Cu-63 can be sufficiently suppressed. In this paper, we report the first results from a study on the Cu-63 background observed in different sets of control samples, and in a 127-year-old environmental copper sample which was directly exposed to cosmic radiation for about 80 years. The Ni-63/Ni ratios measured in the blank samples range up to about 2 x 10(-13) corresponding to concentrations of a few times 10(4) Ni-63 atoms/g Cu. These results provide information on the overall background of the applied methodology and, thus, on the possible sensitivity of Ni-63 measurements in copper samples by means of AMS. In the environmental sample, a Ni-63 concentration of (1.0 +/- 0.3) x 10(5) Ni-63 atoms/g Cu was observed which is not significantly different from the results obtained on commercially available copper material. A similar concentration would be expected in a copper sample located 1300, m from the hypocenter of the Hiroshima atomic bomb. (C) 2004 Elsevier B.V. All rights reserved. C1 Tech Univ Munich, Fak Phys, D-85747 Garching, Germany. Univ Munich, Inst Strahlenbiol, D-80336 Munich, Germany. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Utah, Salt Lake City, UT 84108 USA. RP Rugel, G (reprint author), Beschleunigerlab Forschungsgelande, D-85748 Garching, Germany. EM grugel@ph.tum.de RI Wallner, Anton/G-1480-2011; OI Wallner, Anton/0000-0003-2804-3670; Faestermann, Thomas/0000-0002-6603-8787 NR 13 TC 9 Z9 9 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 776 EP 781 DI 10.1016/j.nimb.2004.04.144 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300142 ER PT J AU Brown, TA Marchetti, AA Martinelli, RE Cox, CC Knezovich, JP Hamilton, TF AF Brown, TA Marchetti, AA Martinelli, RE Cox, CC Knezovich, JP Hamilton, TF TI Actinide measurements by accelerator mass spectrometry at Lawrence Livermore National Laboratory SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE plutonium; actinides; actinide elements; radiochemistry; plutonium bioassay; trace detection; accelerator mass spectrometry (AMS) ID U-236 AB We report on the development of an accelerator mass spectrometry (AMS) system for the measurement of actinides at Lawrence Livermore National Laboratory. This AMS system is centered on a recently completed heavy isotope beam line that was designed particularly for high sensitivity, robust, high throughput measurements of actinide concentrations and isotopic ratios. A fast-isotope switching capability has been incorporated in the system, allowing flexibility in isotope selection and for the quasi-continuous normalization to a reference isotope spike. Initially, our utilization of the heavy isotope system has concentrated on the measurement of Pu isotopes. Under current operating conditions, background levels equivalent to similar to1 x 10(5) atoms are observed during routine Pu-239 and Pu-240 measurements. Measurements of samples containing similar to10(13) U-238 atoms demonstrate that the system provides a U-238 rejection factor during Pu-239 measurements of similar to10(7). Measurements of known materials, combined with results from an externally organized intercomparison program, indicate that our Pu-239 measurements are accurate and precise down to the muBq level (similar to10(6) atoms). Recently, we have investigated the performance of our heavy isotope AMS system in measurements of Np-237 and U-236. Results of these investigations are discussed. The sensitivity shown by our Pu measurements, combined with the high throughput and interference rejection capabilities of our AMS system, demonstrate that AMS can provide a rapid and cost-effective measurement technique for actinides in a wide variety of studies. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry L397, Livermore, CA 94551 USA. Lawrence Livermore Natl Lab, Div Environm Sci, Livermore, CA 94551 USA. RP Brown, TA (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry L397, 7000 E Ave, Livermore, CA 94551 USA. EM tabrown@llnl.gov NR 11 TC 30 Z9 32 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 788 EP 795 DI 10.1016/j.nimb.2004.04.146 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300144 ER PT J AU Winkler, S Ahmad, I Golser, R Kutschera, W Orlandini, KA Paul, M Priller, A Steier, P Valenta, A Vockenhuber, C AF Winkler, S Ahmad, I Golser, R Kutschera, W Orlandini, KA Paul, M Priller, A Steier, P Valenta, A Vockenhuber, C TI Developing a detection method of environmental Pu-244 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE AMS; Pu-244; supernova; sediments ID ACCELERATOR MASS-SPECTROMETRY AB The long-lived radionuclide Pu-244 (t(1/2) = 80.8 +/- 1.0 Ma) is a candidate for the detection as a live remnant of close-lying and relatively recent supernovae in geological records on the earth. We will present the development of an AMS method for measuring Pu-244. at the low abundance levels which are expected for natural Pu-244. For artificial samples prepared from chemically pure reagents a sensitivity of more than 3 x 10(-6) counts in detector per atom in sputter target was achieved. For true sediment samples the detector background induced by chemical impurities and possible cross contamination from high level standards were identified as the present limitations. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Vienna, Inst Isotopenforsch & Kernphys, Vienna Environm Res Accelerator, A-1090 Vienna, Austria. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA. Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel. Univ Leoben, Inst Met Phys, A-8700 Leoben, Austria. Austrian Acad Sci, Erich Schmid Inst Mat Wissensch, A-8700 Leoben, Austria. RP Winkler, S (reprint author), Australian Natl Univ, Dept Phys Nucl, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia. EM stephan.winkler@anu.edu.au OI Priller, Alfred/0000-0002-5008-2089 NR 13 TC 6 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 817 EP 822 DI 10.1016/j.nimb.2004.04.151 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300149 ER PT J AU Buchholz, BA Mueller, CJ Martin, GC Cheng, AS Dibble, RW Frantz, BR AF Buchholz, BA Mueller, CJ Martin, GC Cheng, AS Dibble, RW Frantz, BR TI Tracing fuel component carbon in the emissions from diesel engines SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Accelerator Mass Spectrometry CY SEP 09-13, 2002 CL Nagoya Univ, Nagoya, JAPAN SP Japanese Minist Educ, Culture, Sports, Sci & Technol, Nihon Univ, Inst Nat Sci, Tokyo Geog Soc, Daiko Fdn, Nagoya Convent & Visitors Bur, Nagoya Univ Fdn, High Voltage Engn Europe BV HO Nagoya Univ DE accelerator mass spectrometry; diesel; particulate matter; volatile organic fraction AB The addition of oxygenates to diesel fuel can reduce particulate emissions, but the underlying chemical pathways for the reductions are not well understood. While measurements of particulate matter (PM), unburned hydrocarbons (HC), and carbon monoxide (CO) are routine, determining the contribution of carbon atoms in the original fuel molecules to the formation of these undesired exhaust emissions has proven difficult. Renewable bio-derived fuels (ethanol or biodiesel) containing a universal distribution of contemporary carbon are easily traced by accelerator mass spectrometry (AMS). These measurements provide general information about the emissions of bio-derived fuels. Another approach exploits synthetic organic chemistry to place C-14 atoms in a specific bond position in a specific fuel molecule. The highly labeled fuel molecule-is then diluted in C-14-free petroleum-derived stock to make a contemporary petroleum fuel suitable for tracing. The specific C-14 atoms are then traced through the combustion event to determine whether they reside in PM, HC, CO, CO2, or other emission products. This knowledge of how specific molecular structures produce certain emissions can be used to refine chemical-kinetic combustion models and to optimize fuel composition to reduce undesired emissions. Due to the high sensitivity of the technique and the lack of appreciable C-14 in fossil fuels, fuels for AMS experiments can be labeled with modern levels of C-14 and still produce a strong signal. Since the fuel is not radioactive, emission tests can be conducted in any conventional engine lab, dynamometer facility, or on the open road. Published by Elsevier B.V. C1 Lawrence Livermore Natl Lab, Ctr AMS, Livermore, CA 94551 USA. Sandia Natl Labs, Combust Res Facil, Livermore, CA 94550 USA. Univ Illinois, Dept Mech Engn, Urbana, IL 61801 USA. Univ Calif Berkeley, Dept Engn Mech, Berkeley, CA 94720 USA. RP Buchholz, BA (reprint author), Lawrence Livermore Natl Lab, Ctr AMS, 7000 E Ave, Livermore, CA 94551 USA. EM buchholz2@llnl.gov RI Buchholz, Bruce/G-1356-2011 NR 14 TC 8 Z9 9 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 223 BP 837 EP 841 DI 10.1016/j.nimb.2004.04.154 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 852JT UT WOS:000223752300152 ER PT J AU Pruet, J Hall, J Descalle, MA Prussin, S AF Pruet, J Hall, J Descalle, MA Prussin, S TI Monte Carlo models for the production of beta-delayed gamma-rays following fission of special nuclear materials SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article DE Monte Carlo simulations; fission reactions AB A Monte Carlo method for the estimation of beta-delayed gamma-ray spectra following fission is described that can accomodate an arbitrary time-dependent fission rate and photon collection history. The method invokes direct sampling of the independent fission yield distributions of the fissioning system, the branching ratios for decay of individual fission products and the spectral distributions for photon emission for each decay mode. Though computationally intensive, the method can provide a detailed estimate of the spectrum that would be recorded by an arbitrary spectrometer, and can prove useful in assessing the quality of evaluated data libraries, for identifying gaps in these libraries, etc. The method is illustrated by a first comparison of calculated and experimental spectra from decay of short-lived fission products following the reactions U-235(n(th),f) and Pu-239(n(th),f). For general purpose transport calculations, where detailed consideration of the large number of individual gamma-ray transitions in a spectrum may be unnecessary, it is shown that an accurate and simple parameterization of a gamma-ray source function can be obtained. These parametrizations should provide high-quality average spectral distributions that should prove useful in calculations describing photons escaping from thick attenuating media. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Livermore Natl Lab, N Div, Livermore, CA 94550 USA. Lawrence Livermore Natl Lab, M Div, Livermore, CA 94550 USA. Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Pruet, J (reprint author), Lawrence Livermore Natl Lab, N Div, POB 808,L-414,7000 E Ave, Livermore, CA 94550 USA. EM pruet1@llnl.gov NR 5 TC 13 Z9 13 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 222 IS 3-4 BP 403 EP 410 DI 10.1016/j.nimb.2004.03.062 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 843XY UT WOS:000223121800007 ER PT J AU Hryciw, A Meldrum, A Buchanan, KS White, CW AF Hryciw, A Meldrum, A Buchanan, KS White, CW TI Effects of particle size and excitation spectrum on the photoluminescence of silicon nanocrystals formed by ion implantation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article DE silicon; nanocrystals; photoluminescence; ion-implantation ID ABSORPTION CROSS-SECTIONS; OPTICAL-PROPERTIES; QUANTUM DOTS; NANOSCALE SILICON; ENERGY-TRANSFER; POROUS SILICON; LIGHT-EMISSION; SIO2 MATRIX; LUMINESCENCE; MECHANISM AB Ion implantation was used to synthesize two specimens Of SiO2 containing silicon nanocrystals with different average sizes. Although the luminescence spectra of the two specimens were slightly different, selective excitation experiments tuned to specific regions of the absorption spectrum do not indicate any direct particle-size dependence of the luminescence. The spectrum is, however, highly sensitive to the excitation power, due to the more rapid recombination dynamics at higher frequencies. The luminescence lifetime was slightly smaller for the larger nanoparticles. These results are consistent with a sub-gap recombination mechanism for silicon nanocrystals embedded in a matrix Of SiO2. Tuning the wavelength of emission from light-emitting devices based on these materials is therefore not likely to be achieved by controlling the particle size; such tunability may instead be realized by techniques such as doping or otherwise chemically modifying silicon nanocomposites. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN USA. RP Meldrum, A (reprint author), Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. EM ameldrum@ualberta.ca RI Hryciw, Aaron/D-4166-2013; OI Hryciw, Aaron/0000-0003-2358-5489; Buchanan, Kristen/0000-0003-0879-0038 NR 44 TC 18 Z9 19 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X EI 1872-9584 J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 222 IS 3-4 BP 469 EP 476 DI 10.1016/j.nimb.2004.02.025 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 843XY UT WOS:000223121800014 ER PT J AU Jiang, W Shutthanandan, V Thevuthasan, S McCready, DE Weber, WJ AF Jiang, W Shutthanandan, V Thevuthasan, S McCready, DE Weber, WJ TI Carbon analysis using energetic ion beams SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article DE carbon analysis; reaction/scattering cross section; energetic ion beams ID CROSS-SECTIONS; OXYGEN; BACKSCATTERING; SILICON AB Both nuclear reaction analysis and non-Rutherford elastic scattering have been widely used for analysis of light elements in solids; these two ion-beam methods complement more traditional analysis by Rutherford backscattering spectrometry. In this study, the reaction/scattering cross sections for C-12(p,p)C-12, C-12(d,p)C-13 and C-12(alpha,alpha)C-12 at an angle of 150degrees are measured over relevant energy regions using thin films of carbon (5.8 mug/cm(2)) on silicate glass. The results are plotted and tabulated as a function of ion energy, with typical uncertainties of 4% for the cross section data. In addition, the angular distribution of the cross sections for the reaction C-12(d,p)C-13 at an ion energy of 0.94 MeV has also been determined from 100degrees to 170degrees. An example for the application of this reaction to SiC is given. (C) 2004 Elsevier B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Jiang, W (reprint author), Pacific NW Natl Lab, MSIN K8-93,POB 999, Richland, WA 99352 USA. EM weilinjiang@pnl.gov RI Weber, William/A-4177-2008; OI Weber, William/0000-0002-9017-7365; Jiang, Weilin/0000-0001-8302-8313 NR 15 TC 14 Z9 14 U1 3 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 2004 VL 222 IS 3-4 BP 538 EP 546 DI 10.1016/j.nimb.2004.03.001 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 843XY UT WOS:000223121800024 ER PT J AU Trellue, HR AF Trellue, HR TI Neutronic and logistic proposal for transmutation of plutonium from spent nuclear fuel as mixed-oxide fuel in existing light water reactors SO NUCLEAR TECHNOLOGY LA English DT Article DE full cores of MOX fuel; transmutation; neutronics safety ID CORES AB The use of light water reactors (LWRs) for the destruction of plutonium and other actinides [especially those in spent nuclear fuel (SNF)] is being examined worldwide. One possibility for transmutation of this material is the use of mixed-oxide (MOX) fuel, which is a combination of uranium and plutonium oxides. MOX fuel is used in nuclear reactors worldwide, so a large experience base for its use already exists. However, to limit implementation of SNF transmutation to only a fraction of the LWRs in the United States with a reasonable number of license extensions, full cores of MOX fuel probably are required. This paper addresses the logistics associated with using LWRs for this mission and the design issues required for full cores of MOX fuel. Given limited design modifications, this paper shows that neutronic safety conditions can be met for full cores of MOX fuel with up to 8.3 wt% of plutonium. C1 Los Alamos Natl Lab, Nucl Design & Risk Anal Grp D5, Los Alamos, NM 87545 USA. RP Trellue, HR (reprint author), Los Alamos Natl Lab, Nucl Design & Risk Anal Grp D5, POB 1663,MS K575, Los Alamos, NM 87545 USA. EM trellue@lanl.gov NR 28 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60526 USA SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 2004 VL 147 IS 2 BP 171 EP 180 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 848WC UT WOS:000223497800001 ER PT J AU Tzanos, CP AF Tzanos, CP TI Computational fluid dynamics for the analysis of light water reactor flows SO NUCLEAR TECHNOLOGY LA English DT Article DE computational fluid dynamics; turbulence simulation; k-epsilon models AB Benchmark experiments simulating flows in a pressurized water reactor rod bundle were analyzed to evaluate the performance of a state-of-the-art computational fluid dynamics (CFD) code. For the simulation of turbulence a number of standard k-epsilon models were used. Away from components that cause significant flow deflections, the difference between mean velocity predictions and measurements is within the experimental error. Near such components there is significant discrepancy between velocity predictions and measurements. Even in rod bundles without flow deflectors, the turbulence predictions of standard k-epsilon models show significant discrepancy with measurements. These discrepancies are greater near components that cause flow deflections. Turbulence generated by vanes on spacer grids significantly enhances thermal mixing. To improve the fidelity of CFD simulations of flows in reactor rod bundles, the development of Reynolds averaging of the Navier-Stokes equations turbulence models based on such flows is needed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Tzanos, CP (reprint author), Argonne Natl Lab, 9700 S Cass Ave,Bldg 208, Argonne, IL 60439 USA. EM tzanos@anl.gov NR 8 TC 9 Z9 9 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60526 USA SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 2004 VL 147 IS 2 BP 181 EP 190 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 848WC UT WOS:000223497800002 ER PT J AU Icenhour, AS Toth, LM Luo, HM AF Icenhour, AS Toth, LM Luo, HM TI Water sorption and gamma radiolysis studies for uranium oxides SO NUCLEAR TECHNOLOGY LA English DT Article DE gamma radiolysis; uranium oxide; water sorption ID OXIDATION BEHAVIOR; FUEL; UO2; AIR; 150-DEGREES-C; RADIATION; DIOXIDE AB Experiments have been performed in our laboratory on water sorption and radiolysis for uranium oxides. For the water sorption experiments, uranium oxide samples were prepared and exposed to known levels of humidity to establish the water uptake rate. Subsequently, the amount of water removed was studied by heating samples in an oven at fixed temperatures and by differential thermal analysis/thermogravimetric analysis. It was demonstrated that heating at 650degreesC adequately removes all moisture from the samples. Uranium-238 oxides were irradiated in a Co-60 source and in the high-gamma-radiation fields provided by spent nuclear fuel elements of the High Flux Isotope Reactor. For hydrated samples of UO3, the primary gas produced was H-2; however, the maximum pressure increase reached a steady-state value of similar to500 torr (10 psi). This H-2 production appears to be a function of the dose and the amount of water present. Oxygen in the hydrated UO3 sample atmosphere was typically depleted, and no significant pressure rise was observed. Heat treatment of the UO3.xH(2)O at 650degreesC results in conversion to U3O8 and eliminates the H-2 production. For all of the U3O8 samples loaded in air and irradiated with gamma radiation, a pressure decrease was seen and little, if any, H-2 was produced-even for samples with up to 9 wt% moisture content. Hence, these results demonstrated that the efforts to remove trace moisture from U3O8 are not necessary to avoid pressurization of stored uranium oxides caused by gamma-induced radiolysis. In fact, this system can tolerate several percent of sorbed moisture. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Icenhour, AS (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM icenhouras@oml.gov OI Icenhour, Alan/0000-0002-0095-7019 NR 23 TC 0 Z9 0 U1 1 U2 8 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60526 USA SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 2004 VL 147 IS 2 BP 258 EP 268 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 848WC UT WOS:000223497800008 ER PT J AU Fischer, B Smolinski, M Buongiorno, J AF Fischer, B Smolinski, M Buongiorno, J TI Nitrogen-16 generation and transport and associated shielding requirements in a supercritical-water-cooled reactor SO NUCLEAR TECHNOLOGY LA English DT Article DE coolant activation; supercritical-water-cooled reactor; nitrogen-16 ID CHEMISTRY AB As a water-cooled nuclear system with a direct thermal cycle, the supercritical-water-cooled reactor (SCWR) shares with the boiling water reactor (BWR) the issue of coolant activation and transport of the coolant activation products to the turbine and balance of plant (BOP). Consistent with the BWR experience, the dominant nuclide contributing to the SCWR coolant radioactivity at full power is N-16, which is produced by an (n, p) reaction on O-16. In this paper the production and decay of N-16 in the SCWR coolant circuit along with the shielding requirements imposed on the BOP are analyzed and compared with those in a BWR with a similar thermal power rating. A simple control-mass approach is adopted in which the N-16 inventory in a unit mass of coolant is tracked as the coolant flows in the SCWR and BWR primary systems, which are divided into several compartments (e.g., core, lower plenum, downcomer, etc.) of known volume, mass flow rate, and neutron flux. The values of the neutron flux and (n, p) cross section in the SCWR and BWR cores are calculated by means of full-length radially reflected Monte Carlo eigenvalue models of the SCWR and BWR fuel assemblies. The results are as follows: The N-16 activities in the steam lines of the BWR with normal water chemistry, in the BWR with hydrogen water chemistry, and in the SCWR are about 40, 180, and 380 muCi/g, respectively. The calculated BWR values compare well with the trends and ranges found in the literature. The SCWR N-16 concentration is significantly higher than that in the BWR for the following four reasons: 1. The coolant transit time in the SCWR core is about twice that in the BWR core. 2. The neutron flux is higher in the SCWR because of the higher power density. 3. The slow coolant pass in the water rods produces a significant N-16 activity at the SCWR core inlet. 4. In the SCWR all the N-16 generated in the core is sent to the steam lines because there is no recirculation within the vessel. A simple gamma attenuation model shows that the higher N-16 activity in the SCWR results in shielding requirements only up to 10% higher than for the BWR with hydrogen water chemistry. However, because of the higher SCWR electric power, the specific shielding costs per unit of electric power associated with N-16 are expected to be similar to or better than that for BWRs. C1 Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA. Dept Nucl Engn, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Fischer, B (reprint author), Univ Wisconsin, Dept Engn Phys, 1500 Engn Dr, Madison, WI 53706 USA. EM jacopo@mit.edu NR 30 TC 0 Z9 0 U1 3 U2 5 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60526 USA SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 2004 VL 147 IS 2 BP 269 EP 283 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 848WC UT WOS:000223497800009 ER PT J AU Law, JD Herbst, RS Peterman, DR Tillotson, RD Todd, TA AF Law, JD Herbst, RS Peterman, DR Tillotson, RD Todd, TA TI Development of a cobalt dicarbollide/polyethylene glycol solvent extraction process for separation of cesium and strontium to support advanced aqueous reprocessing SO NUCLEAR TECHNOLOGY LA English DT Article DE cesium; strontium; cobalt dicarbollide ID ACIDIC RADIOACTIVE-WASTE; UNEX PROCESS; ACTINIDES AB A chlorinated cobalt dicarbollide (CCD)/polyethylene glycol (PEG) based solvent extraction process is being developed for the separation of Cs and Sr from leached spent light water reactor (LWR) fuel as part of the Advanced Fuel Cycle Initiative (AFCI). The separation of Cs and Sr would significantly reduce the heat generation of spent nuclear fuel requiring geologic disposal. A solvent composition for this process has been verified, and the distribution coefficient acid dependency for Cs, Sr, Am, and Eu have been measured for the CCD/PEG solvent Leached spent fuel simulant, traced with Cs-137, Sr-85, Am-241, and Eu-154, was used to perform batch contact flowsheet experiments for the extraction, scrub, and strip sections of the CCD/PEG process. Additionally, the effects of acetohydroxamic acid and its decomposition products, as well as the effects of the uranium extraction (UREX) process solvent, on the extraction of Cs and Sr with the CCD/PEG process were evaluated. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Law, JD (reprint author), Idaho Natl Engn & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. EM jdlaw@inel.gov RI Todd, Terry /O-4930-2016; OI Todd, Terry /0000-0003-1324-6950; Law, Jack/0000-0001-7085-7542 NR 5 TC 20 Z9 20 U1 1 U2 7 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60526 USA SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 2004 VL 147 IS 2 BP 284 EP 290 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 848WC UT WOS:000223497800010 ER PT J AU Baker, KL Stappaerts, EA Gavel, D Wilks, SC Tucker, J Silva, DA Olsen, J Olivier, SS Young, PE Kartz, MW Flath, LM Kruelevitch, P Crawford, J Azucena, O AF Baker, KL Stappaerts, EA Gavel, D Wilks, SC Tucker, J Silva, DA Olsen, J Olivier, SS Young, PE Kartz, MW Flath, LM Kruelevitch, P Crawford, J Azucena, O TI High-speed horizontal-path atmospheric turbulence correction with a large-actuator-number microelectromechanical system spatial light modulator in an interferometric phase-conjugation engine SO OPTICS LETTERS LA English DT Article ID WAVE-FRONT CORRECTION; ADAPTIVE-OPTICS; DEFORMABLE MIRRORS; LOOP AB Results of atmospheric propagation for a high-speed, large-actuator-number adaptive optics system are presented. The system uses a microelectromechanical system- (MEMS-) based spatial light modulator correction device with 1024 actuators. Tests over a 1.35-km path achieved correction speeds in excess of 800 Hz and Strehl ratios close to 0.5. The wave-front sensor was based on a quadrature interferometer that directly measures phase. This technique does not require global wave-front reconstruction, making it relatively insensitive to scintillation and phase residues. The results demonstrate the potential of large-actuator-number MEMS-based spatial light modulators to replace conventional deformable mirrors. (C) 2004 Optical Society of America. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Baker, KL (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM baker7@llnl.gov NR 14 TC 16 Z9 16 U1 1 U2 6 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 AUG 1 PY 2004 VL 29 IS 15 BP 1781 EP 1783 DI 10.1364/OL.29.001781 PG 3 WC Optics SC Optics GA 838KT UT WOS:000222712900026 PM 15352368 ER PT J AU Hilton, DJ Averitt, RD Meserole, CA Fisher, GL Funk, DJ Thompson, JD Taylor, AJ AF Hilton, DJ Averitt, RD Meserole, CA Fisher, GL Funk, DJ Thompson, JD Taylor, AJ TI Terahertz emission via ultrashort-pulse excitation of magnetic metal films SO OPTICS LETTERS LA English DT Article ID OPTICAL RECTIFICATION; RADIATION; GENERATION AB We observe terahertz emission by optical rectification of an intense 1.5-eV, 50-fs pulse in single-crystal iron thin films grown by molecular beam epitaxy. The azimuthal dependence of the emission indicates the presence of a magnetic nonlinearity and a nonmagnetic surface nonlinearity. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hilton, DJ (reprint author), Los Alamos Natl Lab, MST-10,DX-2, Los Alamos, NM 87545 USA. EM dhilton@lanl.gov RI Hilton, David/E-4929-2010 NR 14 TC 55 Z9 57 U1 0 U2 13 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 AUG 1 PY 2004 VL 29 IS 15 BP 1805 EP 1807 DI 10.1364/OL.29.001805 PG 3 WC Optics SC Optics GA 838KT UT WOS:000222712900034 PM 15352376 ER PT J AU Zhang, Y Pint, BA Haynes, JA Tortorelli, PF AF Zhang, Y Pint, BA Haynes, JA Tortorelli, PF TI The effect of water vapor on the oxidation behavior of CVD iron-aluminide coatings SO OXIDATION OF METALS LA English DT Article DE water vapor; iron aluminide; coatings; stainless steel; ferritic steel ID HIGH-TEMPERATURE CORROSION; OXIDE HYDROXIDE EVAPORATION; SCALE ADHESION; ALLOYS; CHROMIUM; SULFUR; ELEMENTS; STEELS; FE; PERFORMANCE AB The oxidation behavior of iron-aluminide coatings, Fe3Al or (Fe, Ni)(3)Al, produced by chemical-vapor deposition (CVD) was studied in the temperature range of 700 - 800degreesC in air + 10 vol.% H2O. A typical ferritic steel, Fe-9Cr-1Mo, and an austenitic stainless steel, 304L, were coated. For both substrates, the as-deposited coating consisted of a thin (<5 μm), Al-rich outer layer above a thicker ( 30 - 50 μm), lower-Al-content inner layer. In addition to coated and uncoated Fe-9Cr-1Mo and 304L, cast Fe-Al model alloys with similar Al contents ( 13 - 20 at.%) to the CVD coatings were included in the oxidation exposures for comparison. The specimens were cycled to 1000 1 hr cycles at 700&DEG;C and 500 1 hr cycles at 800&DEG;C, respectively. The CVD coating specimens showed excellent performance in the water-vapor environment at both temperatures, while the uncoated alloys were severely attacked. These results suggest that an aluminide coating can substantially improve resistance to water-vapor attack under these conditions. C1 Tennessee Technol Univ, Dept Mech Engn, Cookeville, TN 38505 USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Zhang, Y (reprint author), Tennessee Technol Univ, Dept Mech Engn, Cookeville, TN 38505 USA. EM yzhang@tntech.edu RI Pint, Bruce/A-8435-2008 OI Pint, Bruce/0000-0002-9165-3335 NR 36 TC 18 Z9 20 U1 1 U2 4 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0030-770X J9 OXID MET JI Oxid. Met. PD AUG PY 2004 VL 62 IS 1-2 BP 103 EP 120 DI 10.1023/B:OXID.0000038788.02094.cb PG 18 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 848RX UT WOS:000223485900007 ER PT J AU Paglieroni, DW AF Paglieroni, DW TI Design considerations for image segmentation quality assessment measures SO PATTERN RECOGNITION LA English DT Article DE image segmentation; chamfer and numerical matching; distance transform; spectral and boundary phase; phase modulation; consistency with human perception ID ALGORITHM AB Factors to consider when designing quality assessment measures for image segmentation are discussed. Quality assessment requires one manually generated segmentation (for reference) plus computer-generated segmentations corresponding to different image segmentation algorithms or algorithm parameter settings. Since true pixel class assignments are seldom available, one must typically rely on a trained human analyst to produce a reference by using a mouse to draw boundaries of perceived regions on a digital image background. Different algorithms and parameter settings can be compared by ranking computed disparities between maps of computer-generated region boundaries and region boundaries from a common reference. Proximity-based association between two boundary pixels is discussed in the context of association distance. Motivated by the concept of phase-modulated signals, a penalty factor on the degree of association is then introduced as some non-negative power (phase modulation order) of the cosine of disparity in phase (boundary direction) between two boundary pixels. Families of matching measures between maps of region boundaries are defined as functions of associations between many pairs of boundary pixels. The measures are characterized as one-way (reflecting relationships in one direction between region boundaries from two segmentations) vs. two-way (reflecting relationships in both directions). Measures of inconsistency between perceived and computed matches of computer and manually generated region boundaries are developed and exercised so that effects of association distance, phase modulation, and choice of matching measure on image segmentation quality assessment can be quantified. It is quantitatively established that consistency can be significantly improved by using two-way measures in conjunction with high-order phase modulation and moderate association distances. (C) 2004 Pattern Recognition Society. Published by Elsevier Ltd. All rights reserved. C1 Lawrence Livermore Natl Lab, Dept Energy, Livermore, CA 94550 USA. RP Paglieroni, DW (reprint author), Lawrence Livermore Natl Lab, Dept Energy, POB 808 L290, Livermore, CA 94550 USA. EM paglieroni1@linl.gov NR 23 TC 13 Z9 15 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0031-3203 J9 PATTERN RECOGN JI Pattern Recognit. PD AUG PY 2004 VL 37 IS 8 BP 1607 EP 1617 DI 10.1016/j.patcog.2004.01.017 PG 11 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA 832RO UT WOS:000222284800003 ER PT J AU Blaisdell, J Jorge-Nebert, LF Coulter, S Ferguson, SS Lee, SJ Chanas, B Xi, T Mohrenweiser, H Ghanayem, B Goldstein, JA AF Blaisdell, J Jorge-Nebert, LF Coulter, S Ferguson, SS Lee, SJ Chanas, B Xi, T Mohrenweiser, H Ghanayem, B Goldstein, JA TI Discovery of new potentially defective alleles of human CYP2C9 SO PHARMACOGENETICS LA English DT Article DE alleles; cDNA expression; CYP2C9; CYP2C9 poor metabolizers; polymorphisms; tolbutamide ID CONSTITUTIVE ANDROSTANE RECEPTOR; HUMAN LIVER-MICROSOMES; AMINO-ACID; CYTOCHROME P4502C9; FUNCTIONAL-CHARACTERIZATION; IDENTIFICATION; VARIANTS; POLYMORPHISMS; PHARMACOKINETICS; PHENYTOIN AB CYP2C9 is a clinically important enzyme, responsible for the metabolism of numerous clinically important therapeutic drugs. In the present study, we discovered 38 single nucleotide polymorphisms in CYP2C9 by resequencing of genomic DNA from 92 individuals from three different racial groups. Haplotype analysis predicted that there are at least 21 alleles of CYP2C9 in this group of individuals. Six new alleles were identified that contained coding changes: L19I (CYP2C9*7), R150H (CYP2C9*8), H251R (CYP2C9*9), E272G (CYP2C9*10), R335W(CYP2C9*11) and P489S (CYP2C9*12). When expressed in a bacterial cDNA expression system, several alleles exhibited altered catalytic activity. CYP2C9*11 appeared to be a putative poor metabolizer allele, exhibiting a three-fold increase in the K-m and more than a two-fold decrease in the intrinsic clearance for tolbutamide. Examination of the crystal structure of human CYP2C9 reveals that R335 is located in the turn between the J and J' helices and forms a hydrogen-bonding ion pair with D341 from the J' helix. Abolishing this interaction in CYP2C9*11 individuals could destabilize the secondary structure and alter the substrate affinity. This new putative poor metabolizer (PM) allele was found in Africans. A second potentially PM allele CYP2C9*12 found in a racially unidentified sample also exhibited a modest decrease in the V-max and the intrinsic clearance for tolbutamide in a recombinant system. Further clinical studies are needed to determine the effect of these new polymorphisms on the metabolism of CYP2C9 substrates. (C) 2004 Lippincoft Williams Wilkins. C1 NIEHS, Lab Pharmacol & Chem, Human Metab Sect, Res Triangle Pk, NC 27709 USA. Univ Panama, Coll Pharm, Panama City, Panama. Univ Panama, DNA & Human Genom Inst, Panama City, Panama. Lawrence Livermore Natl Lab, Livermore, CA USA. RP Goldstein, JA (reprint author), NIEHS, Lab Pharmacol & Chem, Human Metab Sect, POB 12233, Res Triangle Pk, NC 27709 USA. EM goldstel@niehs.nih.gov RI Goldstein, Joyce/A-6681-2012; OI Coulter, Sherry/0000-0002-2732-3470 NR 33 TC 112 Z9 117 U1 0 U2 3 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0960-314X J9 PHARMACOGENETICS JI Pharmacogenetics PD AUG PY 2004 VL 14 IS 8 BP 527 EP 537 DI 10.1097/01.fpc.0000114759.08559.51 PG 11 WC Biotechnology & Applied Microbiology; Genetics & Heredity; Pharmacology & Pharmacy SC Biotechnology & Applied Microbiology; Genetics & Heredity; Pharmacology & Pharmacy GA 847XD UT WOS:000223430400006 PM 15284535 ER PT J AU Henager, CH Kurtz, RJ Hoagland, RG AF Henager, CH Kurtz, RJ Hoagland, RG TI Interactions of dislocations with disconnections in fcc metallic nanolayered materials SO PHILOSOPHICAL MAGAZINE LA English DT Article ID GRAIN-BOUNDARY DEFECTS; PHASE-TRANSFORMATIONS; MECHANICAL-PROPERTIES; REBOUND MECHANISM; COMPOSITES; INTERFACES; DEFORMATION; MULTILAYERS; RESISTANCE; STRENGTH AB Embedded-atom method potentials and atomistic models of coherent (010) interfaces were used to study slip across interfaces in cube-on-cube oriented Cu/Ni nanolayered materials. (111) disconnections form during slip across Cu-Ni interfaces and become significant barriers to continued deformation. A significant barrier exists for the flat coherent interface owing to the large coherency stresses in the Cu/Ni layers that must be overcome by applied stresses but, once these have been overcome, interface transection occurs readily. A disconnection adds an additional barrier because of a residual dislocation with a Burgers vector magnitude equal to the difference between b(Cu) and b(Ni). This barrier depends on the position of the disconnection relative to the glide plane of the transecting glide dislocation and on the disconnection height. Disconnections cause work hardening that prevents shear band formation during deformation and encourages homogeneous shear processes. Disconnection energies are shown to be relatively small and to depend on the disconnection type and size. C1 Pacific NW Natl Lab, Richland, WA 99335 USA. RP Henager, CH (reprint author), Pacific NW Natl Lab, Richland, WA 99335 USA. EM chuck.henager@pnl.gov RI Hoagland, Richard/G-9821-2012; OI Henager, Chuck/0000-0002-8600-6803 NR 29 TC 39 Z9 39 U1 2 U2 16 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6443 J9 PHILOS MAG JI Philos. Mag. PD AUG 1 PY 2004 VL 84 IS 22 BP 2277 EP 2303 DI 10.1080/14786430410001678235 PG 27 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 840ZG UT WOS:000222898500002 ER PT J AU Radhakrishnan, B Sarma, G AF Radhakrishnan, B Sarma, G TI The effect of coarse non-deformable particles on the deformation and static recrystallization of aluminium alloys SO PHILOSOPHICAL MAGAZINE LA English DT Article ID MONTE-CARLO-SIMULATION; MN SINGLE-CRYSTALS; CRYSTALLOGRAPHIC TEXTURE; STIMULATED NUCLEATION; FCC METALS; HOT DEFORMATION; AL-ALLOYS; POLYCRYSTALS; MICROSTRUCTURE; PLASTICITY AB The phenomenon of particle-stimulated nucleation (PSN) during recrystallization of commercial aluminium alloys has been widely investigated both from a scientific viewpoint and from the industrial perspective. The technological impact of this phenomenon is the finding that, depending upon the thermomechanical processing conditions, the occurrence of PSN may strengthen or weaken the deformation texture during recrystallization, which may or may not be desirable for a specific application of the final product. From a scientific standpoint, the mechanics of formation of localized deformation zones in the vicinity of the hard particles and the development of deformation substructures within the deformation zone that eventually turn into a recrystallized nucleus are still not completely understood. This paper describes the application of a coupled finite-element-Monte Carlo technique to study the phenomenon of PSN during recrystallization of aluminium and the subsequent growth of the nuclei. The deformation and recrystallization textures arising from initial microstructures with and without hard particles are compared to elucidate the particle effect on texture. The simulations have been applied to single crystals, bicrystals and a tricrystal of aluminium of specific crystallographic orientations with and without the hard particles at specific locations such as the grain interior, grain boundary and triple line. The simulation results are compared with existing experimental data on the deformation and recrystallization of particle-containing aluminium alloys. C1 Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. RP Radhakrishnan, B (reprint author), Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. EM radhakrishnb@ornl.gov NR 45 TC 10 Z9 11 U1 0 U2 5 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6443 J9 PHILOS MAG JI Philos. Mag. PD AUG 1 PY 2004 VL 84 IS 22 BP 2341 EP 2366 DI 10.1080/14786430410001689990 PG 26 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 840ZG UT WOS:000222898500006 ER PT J AU Rotter, MD Dane, CB Fochs, S LaFortune, K Merrill, R Yamamoto, B AF Rotter, MD Dane, CB Fochs, S LaFortune, K Merrill, R Yamamoto, B TI Solid-state heat-capacity lasers: Good candidates for the marketplace SO PHOTONICS SPECTRA LA English DT Article C1 Lawrence Livermore Natl Lab, Solid State Heat Capac Laser Program, Livermore, CA 94550 USA. RP Rotter, MD (reprint author), Lawrence Livermore Natl Lab, Solid State Heat Capac Laser Program, POB 808, Livermore, CA 94550 USA. EM rotter@llnl.gov NR 1 TC 6 Z9 12 U1 1 U2 2 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 USA SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD AUG PY 2004 VL 38 IS 8 BP 44 EP + PG 8 WC Optics SC Optics GA 844XV UT WOS:000223195300008 ER PT J AU Wong-Ng, W Cook, LP Levin, I Suh, J Feenstra, R Haugan, T Barnes, P AF Wong-Ng, W Cook, LP Levin, I Suh, J Feenstra, R Haugan, T Barnes, P TI Phase equilibria of Ba-R-Cu-O for coated conductor applications (R = lanthanides and Y) SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE Ba2RCu3O6+x; phase diagrams; BaF2; process; BaF2; Y; Cu vertical bar vertical bar O; F reciproal system AB Phase diagrams of the Ba2RCu3O6-x(R = Nd, Sm, Gd, Y, and Er) superconductors, prepared under 100 Pa O-2 at 810 degreesC, reflect the trend of the lanthanide contraction. The single-phase regions of Ba2-x(Nd1+x-yR'(y))Cu3O6+z for R' = Gd, Y and Yb, and of Ba2-x(R1+x-yYy)Cu3O6+z for R = Eu and Gd were determined. Using these data, both fluxpinning and melting properties can be tailored and optimized. The presence of a low temperature melt during formation of the Ba2YCu3O6+x phase from barium fluoride amorphous precursor films is deemed important for producing quality tapes, and hence for rapid advancement of second-generation RABiTS/IBAD coated conductor technology. Our search for low melting liquid has focused on compositional vectors within the Ba, Y, Cu\\O, F reciprocal system. Published by Elsevier B.V. C1 Natl Inst Stand & Technol, Div Ceram, Mat Sci & Engn Lab, Gaithersburg, MD 20899 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37922 USA. USAF, Res Lab, Wright Patterson AFB, OH 45433 USA. RP Wong-Ng, W (reprint author), Natl Inst Stand & Technol, Div Ceram, Mat Sci & Engn Lab, Mat Bldg Rm A-207, Gaithersburg, MD 20899 USA. EM winnie.wong-ng@nist.gov RI Levin, Igor/F-8588-2010 NR 4 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 20 EP 22 DI 10.1016/j.physc.2004.02.019 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700009 ER PT J AU Angst, M Di Castro, D Puzniak, R Wisniewski, A Jun, J Kazakov, SM Karpinski, J Kohout, S Keller, H AF Angst, M Di Castro, D Puzniak, R Wisniewski, A Jun, J Kazakov, SM Karpinski, J Kohout, S Keller, H TI Anisotropic properties of MgB2 by torque magnetometry SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE MgB2; anisotropy; upper critical field; penetration depth; torque ID SINGLE-CRYSTALS AB Anisotropic properties of superconducting MgB2 obtained by torque magnetometry are compared to theoretical predictions, concentrating on two issues. Firstly, the angular dependence of H-c2 is shown to deviate close to T-c from the dependence assumed by anisotropic Ginzburg-Landau theory. Secondly, from the evaluation of torque vs angle curves it is concluded that the anisotropy of the penetration depth gamma(lambda) has to be substantially higher at low temperature than theoretical estimates, at least in fields higher than 0.2 T. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland. ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland. Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland. RP Angst, M (reprint author), Ames Lab, Ames, IA USA. EM angst@ameslab.gov RI Angst, Manuel/I-4380-2012; Kazakov, Sergey/A-4139-2014; Puzniak, Roman/N-1643-2013; Wisniewski, Andrzej/A-1781-2017; OI Angst, Manuel/0000-0001-8892-7019; Kazakov, Sergey/0000-0002-0553-7881; Puzniak, Roman/0000-0001-5636-5541; DI CASTRO, DANIELE/0000-0002-0878-6904 NR 13 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 88 EP 89 DI 10.1016/j.physc.2004.02.045 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700037 ER PT J AU Jensen, A Toft, KN Abrahamsen, AB Andersen, NH Jensen, J Hedegard, P Klenke, J Prokes, K Smeibidl, P Danilkin, S Sikolenko, V Eskildsen, MR Canfield, PC AF Jensen, A Toft, KN Abrahamsen, AB Andersen, NH Jensen, J Hedegard, P Klenke, J Prokes, K Smeibidl, P Danilkin, S Sikolenko, V Eskildsen, MR Canfield, PC TI Magnetic phase diagram of ErNi2B2C SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE borocarbides; magnetic phases; neutron diffraction; mean-field model ID SUPERCONDUCTIVITY AB The magnetic phase diagram of the superconductor ErNi2B2C (T-c = 11 K and T-N = 6 K) has been studied by neutron diffraction as a function of temperature and magnetic field applied along the symmetry directions [010], [110] and [001] of the tetragonal crystal structure. A series of commensurate magnetic structures, consistent with a transversely polarized spin-density wave with modulation vectors Q = n/ma* (0.55 less than or equal to n/m < 0.60) and the spins along b*, have been observed. The experimental data are compared with the results of a mean-field model that has been established from an analysis of bulk magnetization and zero-field neutron diffraction data. The model accounts for most of the observed features but fails to explain the occurrence of a small component Qdelta approximate to -0.005b* observed close to H-c2 when the field is applied along [110]. (C) 2004 Elsevier B.V. All rights reserved. C1 Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark. Niels Bohr Inst, fAPG, Orsted Lab, DK-2100 Copenhagen O, Denmark. Hahn Meitner Inst Berlin GmbH, Berlin Neutron Scattering Ctr, D-14109 Berlin, Germany. Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Andersen, NH (reprint author), Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark. EM niels.hessel@risoe.dk RI Eskildsen, Morten/E-7779-2011; Andersen, Niels/A-3872-2012; Danilkin, Sergey/L-9419-2013; Sikolenko, Vadim/D-3869-2011; Canfield, Paul/H-2698-2014; Jensen, Jens/C-7484-2015; Hedegard, Per/C-1954-2015 OI Sikolenko, Vadim/0000-0001-5252-6870; Jensen, Jens/0000-0002-7954-8073; Hedegard, Per/0000-0002-6328-7462 NR 8 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 97 EP 99 DI 10.1016/j.physc.2004.02.169 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700041 ER PT J AU Lorenz, B Cmaidalka, J Meng, RL Xue, YY Chu, CW AF Lorenz, B Cmaidalka, J Meng, RL Xue, YY Chu, CW TI Thermodynamic and superconducting properties of the C32 intermetallic compounds CaAlSi and SrAlSi SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE CaAlSi; SrAlSi; heat capacity; pressure effect ID = CA; SR; BA AB We investigate the thermodynamic and superconducting properties of the intermetallic C32 compounds CaAlSi and SrAlSi. The heat capacity of SrAlSi follows the BCS-theory for weak coupling, but the data for CaAlSi indicate an enhanced coupling strength in the latter compound. The characteristic parameters of the normal and superconducting states are evaluated. The effect of high pressure on T-c is positive in CaAlSi but negative in SrAlSi. The opposite signs of the pressure coefficients of T-c indicate distinct differences in the electronic structure at the Fermi energy. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Houston, Dept Phys, Houston, TX 77204 USA. Univ Houston, TCSAM, Houston, TX 77204 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China. RP Lorenz, B (reprint author), Univ Houston, Dept Phys, 3201 Cullen Blvd, Houston, TX 77204 USA. EM blorenz@uh.edu NR 6 TC 0 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 171 EP 172 DI 10.1016/j.physc.2004.02.066 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700071 ER PT J AU Bill, A Morawitz, H Kresin, VZ AF Bill, A Morawitz, H Kresin, VZ TI Metallochloronitrides: electronic pairing mechanism in a new class of superconductors SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE superconductivity; plasmons; electronic pairing; screening ID NITRIDE AB A new class of doped layered superconductors with T-c similar to 26 K has been discovered recently: the metal-intercalated halide nitrides. We show that the superconducting state of the electrons is essentially self-supported in these materials. That is, the dominant contribution to the pairing interaction is provided by collective excitations of the same particles as those forming pairs. We also discuss layered organic and cuprate superconductors within this phonon-plasmon mechanism. (C) 2004 Published by Elsevier B.V. C1 Paul Scherrer Inst, Condensed Matter Theory, CH-5232 Villigen, Switzerland. IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Bill, A (reprint author), Paul Scherrer Inst, Condensed Matter Theory, WHGA-127, CH-5232 Villigen, Switzerland. EM abill@psi.ch NR 8 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 238 EP 239 DI 10.1016/j.physc.2004.02.151 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700100 ER PT J AU Balatsky, AV Abanov, A Zhu, JX AF Balatsky, AV Abanov, A Zhu, JX TI Inelastic tunneling spectroscopy in a d-wave superconductor SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE inelastic tunneling spectroscopy; d-wave superconductor ID EXCHANGE MODEL; ANOMALIES AB We propose a mechanism to use inelastic tunneling spectroscopy STM to detect a single spin in a d-wave superconductor, based on a direct exchange coupling J between the surface electrons and the local spin S in a magnetic field. This coupling will produce a kink in dI/dV characteristics at Zeeman energy of the spin omega(0). We find that for relevant values of parameters the signal scales as dI(2)/dV(2) similar or equal to (JN(0))(2) Theta(eV - omega(0)) and could be in the range of 10(-2) of the bare density of states where No is the density of states for surface electrons. Scattering in superconductor with the coherence peak at gap maximum Delta leads also to strong features at Delta + omega(0). This suggests a new technique for a detection of a local spin excitation with STM. (C) 2004 Published by Elsevier B.V. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Balatsky, AV (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM avb@lanl.gov NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 246 EP 247 DI 10.1016/j.physc.2004.02.134 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700104 ER PT J AU Egami, T Piekarz, P Chung, JH AF Egami, T Piekarz, P Chung, JH TI Role of phonons in the mechanism of high-temperature superconductivity SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE phonons; high-temperature superconductivity ID OXIDE SUPERCONDUCTORS; LO PHONONS; POLARIZATION AB While phonons are generally considered to be irrelevant to the mechanism of high-temperature superconductivity, a large number of experimental results indicate otherwise. We argue that the electron-phonon coupling in strongly correlated electron systems is unconventional, and results in a strong spin-charge-phonon coupling. It could contribute significantly to the superconductivity of the cuprates through the synergetic spin-phonon mechanism. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Penn, Res Struct Matter Lab, Philadelphia, PA 19104 USA. Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA. RP Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM egami@seas.upenn.edu NR 17 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 292 EP 295 DI 10.1016/j.physc.2004.02.092 PG 4 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700124 ER PT J AU Golubov, AA Koshelev, AE AF Golubov, AA Koshelev, AE TI Mixed state in dirty two-band superconductors: application to MgB2 SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE MgB2; two-band superconductors; mixed state; upper critical field AB We investigate a two-band superconductor with strong intraband and weak interband electronic scattering rates in the framework of coupled Usadel equations. We calculate the upper critical field for different field orientation. Due to a very large difference between the e-axis coherence lengths in two-bands, the GL theory is applicable only in the extremely narrow temperature range. This leads to the strong temperature dependence of the H-c2 anisotropy and large deviations of the angular dependence of H-c2 from a simple effective-mass law. In the case of field along c-direction we solved coupled nonlinear Usadel equations numerically to find field evolution of the pair potentials and local densities of states for two-bands. The existence of two distinct length and field scales corresponding to different bands is demonstrated. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Twente, Fac Sci & Technol, Dept Appl Phys, NL-7500 AE Enschede, Netherlands. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Golubov, AA (reprint author), Univ Twente, Fac Sci & Technol, Dept Appl Phys, POB 217, NL-7500 AE Enschede, Netherlands. EM a.golubov@tn.utwente.nl RI Koshelev, Alexei/K-3971-2013 OI Koshelev, Alexei/0000-0002-1167-5906 NR 12 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 338 EP 340 DI 10.1016/j.phys.2004.02.150 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700143 ER PT J AU Tranquada, JM AF Tranquada, JM TI Metallic charge stripes in cuprates SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE stripes; neutron scattering; 214 cuprates ID HIGH-TEMPERATURE SUPERCONDUCTORS; STATE; ORDER; LA2-XSRXCUO4; PHASES; GAP AB Some recent evidence for the existence of dynamic, metallic stripes in the 214 family of cuprates is reviewed. The mechanism of stripe pinning is considered, and changes in the charge density within stripes between the pinned and dynamic phases is discussed. From a purely experimental perspective, dynamic charge stripes are fully compatible with nodal "quasiparticles" and other electronic properties common to all superconducting cuprates. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Tranquada, JM (reprint author), Brookhaven Natl Lab, Dept Phys, Bldg 510-B, Upton, NY 11973 USA. EM jtran@bnl.gov RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 31 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 426 EP 429 DI 10.1016/j.physc.2004.03.015 PG 4 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700180 ER PT J AU Kresin, V Ovchinnikov, Y Wolf, S AF Kresin, V Ovchinnikov, Y Wolf, S TI Inhomogeneous superconductivity and the pseudogap phenomenon: splitting of the resistive and Meissner transitions, percolation threshold SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE pseudogap; percolation; proximity AB The pseudogap state is due to an inhomogeneous structure of the compound and is described by percolation theory. The Meissner and resistive transitions occur at different critical temperatures. The "giant" proximity effect and the impact of an external pressure are analyzed. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. LD Landau Theoret Phys Inst, Moscow 117332, Russia. Univ Virginia, Dept Mat Sci, Charlottesville, VA 22903 USA. RP Kresin, V (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM vzkresin@lbl.gov RI Wolf, Stuart/A-7513-2009 NR 12 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 434 EP 436 DI 10.1016/j.physc.2004.03.013 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700182 ER PT J AU Jooss, C Guth, K Schofield, MA Beleggia, M Zhu, Y AF Jooss, C Guth, K Schofield, MA Beleggia, M Zhu, Y TI Direct measurements of electrostatic potentials at grain boundaries: mechanism for current improvement in high-T-c superconductors SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE grain boundaries; doping ID HIGH-TEMPERATURE SUPERCONDUCTORS; YBA2CU3O7-DELTA; CALCIUM AB Grain boundaries (GBs) in high-temperature superconductors represent the major factor limiting high current applications. Via magneto-optical imaging and direct transport measurements, we observed an increase of the intergranular J(c) in 4degrees and 8degrees [001] low-angle grain boundaries via substitution of Y by Ca in YBa2Cu3O7-x by up to 100%. Since Ca substitution leads to hole overdoping, these results suggest that charge depletion and band bending may be responsible for the suppression of superconductivity in GBs. By using electron holography, we directly observe ail electrostatic potential at the dislocation cores. The radius as well as the value of the potential are reduced in Ca-doped grain boundaries, directly reflecting the improved transport properties. (C) 2004 Elsevier B.V. All rights reserved. C1 Inst Mat Phys, D-37075 Gottingen, Germany. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Jooss, C (reprint author), Inst Mat Phys, Tammanstr 1, D-37075 Gottingen, Germany. EM jooss@ump.gwdg.de OI Beleggia, Marco/0000-0002-2888-1888 NR 11 TC 5 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 443 EP 444 DI 10.1016/j.physc.2004.03.027 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700186 ER PT J AU Fujita, M Goka, H Tranquada, JM Yamada, K AF Fujita, M Goka, H Tranquada, JM Yamada, K TI Stripe correlations in La1.875Ba0.125CuO4 SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE La1.875Ba0.125CuO4; neutron scattering; magnetic fluctuations; stripe correlations AB We have performed neutron scattering measurements on the single crystal of La1.875Ba0.125CuO4 in order to study the melting sequence of stripe correlations. Low-energy incommensurate spin fluctuations clearly are observed around (pi, pi) at low temperatures and remain even above the stripe ordering temperature of 50 K. However, the peak intensity dramatically degrades toward the structural transition temperature between low-temperature tetragonal and low-temperature orthorhombic phases, T-d2, of 60 K. No well-defined signal was observed above T-d2. These results suggest that the charge fluctuations, which are closely related with the crystal structure, modify the magnetic correlations as expected from the stripe model. (C) 2004 Published by Elsevier B.V. C1 Kyoto Univ, Inst Chem Res, Uji 6100011, Japan. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Fujita, M (reprint author), Kyoto Univ, Inst Chem Res, Uji 6100011, Japan. EM fujita@imr.deu RI Tranquada, John/A-9832-2009; Yamada, Kazuyoshi/C-2728-2009; Fujita, Masaki/D-8430-2013 OI Tranquada, John/0000-0003-4984-8857; NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 451 EP 452 DI 10.1016/j.physc.2004.03.023 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700190 ER PT J AU Koshelev, AE AF Koshelev, AE TI Exotic vortex states in layered superconductors created by tilted magnetic field: Josephson vortices, solitons, vortex chains... SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE layered superconductors; vortex lattices; Josephson vortices; pancake vortices AB In very anisotropic layered superconductors tilted magnetic field generates two interpenetrating vortex sublattices. This set of crossing lattices contains a sublattice of Josephson vortices (JVs) and a sublattice of pancake vortex (PV) stacks. The PV sublattice modifies structure of an isolated JV. The JV phase field is composed of the regular and vortex phases. The contribution from the vortex phase smoothly takes over with increase of the magnetic field. The core structure experiences qualitative evolution with anisotropy decrease. At large anisotropies JV weakly distorts PV crystal and the JV core contains many PV rows. At smaller anisotropies the JV core shrinks to one PV row and PV stacks in this central row form a soliton-like structure. At very small c-axis field ( less than or similar to 1 G) the PV stacks form chains located at JVs. At certain field the crossing-lattices chains transform into the tilted-vortices chains. We present a simple criterion for this transition. (C) 2004 Elsevier B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Koshelev, AE (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM koshelev@msd.anl.gov RI Koshelev, Alexei/K-3971-2013 OI Koshelev, Alexei/0000-0002-1167-5906 NR 9 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 470 EP 473 DI 10.1016/j.physc.2004.03.180 PG 4 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700198 ER PT J AU Altshuler, E Johansen, TH Paltiel, Y Jin, P Bassler, KE Ramos, O Reiter, GF Zeldov, E Chu, CW AF Altshuler, E Johansen, TH Paltiel, Y Jin, P Bassler, KE Ramos, O Reiter, GF Zeldov, E Chu, CW TI Experiments in superconducting vortex avalanches SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE critical state; vortex dynamics; avalanches; self-organized criticality AB We detect vortex avalanches in superconducting Nb when an external field is slowly ramped up. Through the combination of micro-Hall probe magnetometry and Magneto-optical imaging, we are able to visualize the magnetic field "landscape" where the "local" vortex avalanches take place. We measure the avalanche size statistics at several locations in the magnetic landscape, comprising a number of events orders of magnitude larger than previously reported. The distributions of avalanche sizes show a nearly power-law character, and their details are strikingly independent from the specific features of the "magnetic landscape" where they take place. Some experiments in order to find spatial-temporal correlations between avalanches are also presented. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Havana, Fac Phys, IMRE, Supercond Lab, Bangkok 10400, Thailand. Univ Houston, Texaz Ctr Supercond, Houston, TX 77202 USA. Univ Oslo, Dept Phys, N-0316 Oslo, Norway. Weizmann Inst Sci, Dept Condensed Matter Phys, IL-7610 Rehovot, Israel. Univ Houston, Dept Phys, Houston, TX 77204 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Hong Kong Univ Sci & Technol, Kowloon, Hong Kong, Peoples R China. RP Altshuler, E (reprint author), Univ Havana, Fac Phys, IMRE, Supercond Lab, Bangkok 10400, Thailand. EM jea@infomed.sld.cu RI Ramos, Osvanny/S-5525-2016; Zeldov, Eli/K-1546-2012 OI Ramos, Osvanny/0000-0001-6014-4944; Zeldov, Eli/0000-0002-8200-4974 NR 10 TC 1 Z9 1 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 501 EP 504 DI 10.1016/j.physc.2004.03.191 PG 4 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700209 ER PT J AU Holanova, Z Szabo, P Kacmarcik, J Samuely, P Ribeiro, RA Bud'ko, SL Canfield, PC AF Holanova, Z Szabo, P Kacmarcik, J Samuely, P Ribeiro, RA Bud'ko, SL Canfield, PC TI Energy gaps in carbon-substituted MgB2 SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE point-contact spectroscopy; MgB2; two-band superconductivity ID MAGNESIUM DIBORIDE AB The point-contact spectroscopy studies on the superconducting energy gap of the nearly single-phase carbon-substituted MgB2 are presented. Despite the strong suppression of the transition temperature by 17 K in comparison with the pure MgB2 a small superconducting energy gap with 2Delta/kT(c) similar to 1.7 closing at the bulk T-c = 22 K has been systematically observed. Measurements in magnetic fields also indicate the presence of a large gap in the spectrum. Thus, the two-band/two-gap superconductivity is still preserved here. (C) 2004 Elsevier B.V. All rights reserved. C1 SAS, Ctr Low Temp Phys, Inst Expt Phys, Kosice 04353, Slovakia. UPJS, FS, Kosice 04353, Slovakia. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Samuely, P (reprint author), SAS, Ctr Low Temp Phys, Inst Expt Phys, Watsonova 47, Kosice 04353, Slovakia. EM samuely@saske.sk RI Ribeiro, Raquel/B-9041-2012; Canfield, Paul/H-2698-2014 OI Ribeiro, Raquel/0000-0001-6075-1701; NR 7 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 610 EP 611 DI 10.1016/j.physc.2004.03.039 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700259 ER PT J AU Helm, C Bulaevskii, LN Ryndyk, DA Keller, J Rother, S Koval, Y Muller, P Kleiner, R AF Helm, C Bulaevskii, LN Ryndyk, DA Keller, J Rother, S Koval, Y Muller, P Kleiner, R TI Electronic compressibility and charge imbalance relaxation in cuprate superconductors SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE intrinsic Josephson effect; optical spectroscopy; transport; charge imbalance; Bi2Sr2CaCu2O8; SmLa1-x,SrxCuO4-delta ID JOSEPHSON PLASMA RESONANCE; SMLA0.8SR0.2CUO4-DELTA; CRYSTALS; MODE AB In the material SmLa1-xSrxCuO4-delta with alternating intrinsic Josephson junctions we explain theoretically the relative amplitude of the two plasma peaks in transmission by taking into account the spatial dispersion of the Josephson Plasma Resonance in c-direction due to charge coupling. From this and the magnetic field dependence of the plasma peaks in the vortex solid and liquid states it is shown that the electronic compressibility of the CuO2 layers is consistent with a free electron value. Also the London penetration depth lambda(ab) approximate to 1100 Angstrom near T-c can be determined. The voltage response in the IV-curve of a Bi2Sr2CaCu2O8 mesa due to microwave irradiation or current injection in a second mesa is related to the nonequilibrium charge imbalance of quasiparticles and Cooper pairs and from our experimental data the relaxation time similar to100 ps is obtained. (C) 2004 Elsevier B.V. All rights reserved. C1 ETH Honggerberg, Inst Theoret Phys, CH-8093 Zurich, Switzerland. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. Univ Erlangen Nurnberg, Inst Phys 3, D-91058 Erlangen, Germany. Univ Tubingen, Inst Phys, D-72076 Tubingen, Germany. RP Helm, C (reprint author), ETH Honggerberg, Inst Theoret Phys, HPZ G8-0, CH-8093 Zurich, Switzerland. EM helm@phys.ethz.ch RI Muller, Paul/H-2179-2013 NR 15 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 612 EP 613 DI 10.1016/j.physc.2004.03.048 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700260 ER PT J AU Xue, YY Lorenz, B Baikalov, A Cmaidaka, J Chen, F Meng, RL Chu, CW AF Xue, YY Lorenz, B Baikalov, A Cmaidaka, J Chen, F Meng, RL Chu, CW TI Granular superconductivity and phase separation in Ru121Eu SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE Ru1212Eu; phase separation; spontaneous vortex AB The magnetic and superconducting properties of RuSr2EuCu2O10+delta (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and anti ferro magnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phaseseparation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H-2 and the demagnetizing field H-dm. The data show that the FM component is along the a, b direction with a maximum Hdm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above T-c. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Houston, TCSUH, Houston Sci Ctr 202, Houston, TX 77204 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. HKUST, Hong Kong, Hong Kong, Peoples R China. RP Xue, YY (reprint author), Univ Houston, TCSUH, Houston Sci Ctr 202, Houston, TX 77204 USA. EM yxue@uh.edu NR 3 TC 3 Z9 3 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 638 EP 640 DI 10.1016/j.physc.2004.03.090 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700271 ER PT J AU Gedik, N Orenstein, J Liang, RX Bonn, DA Hardy, W AF Gedik, N Orenstein, J Liang, RX Bonn, DA Hardy, W TI Non-equilibrium quasiparticle dynamics in single crystals of YBCO ortho II SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE pump probe spectroscopy; superconductivity; YBCO; ortho II AB We report measurements of the photoinduced change in reflectivity of untwinned single crystals of YBa2Cu3O6.5. The decay rate of the transient change in reflectivity was found to depend on the laser intensity and temperature strongly. By studying the intensity dependence at low temperatures we obtained the quasiparticle scattering coefficient from which we estimate the electron-phonon coupling constant. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA. Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z4, Canada. RP Gedik, N (reprint author), Univ Calif Berkeley, Dept Phys, 1 Cyclotron Rd,Mail Stop 2-300, Berkeley, CA 94720 USA. EM gedik@socrates.berkeley.edu RI Orenstein, Joseph/I-3451-2015 NR 5 TC 1 Z9 1 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 690 EP 691 DI 10.1016/j.physc.2004.03.113 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700294 ER PT J AU Paglione, J Tanatar, MA Hawthorn, DG Boaknin, E Hill, RW Ronning, F Sutherland, M Taillefer, L Petrovic, C Canfield, PC AF Paglione, J Tanatar, MA Hawthorn, DG Boaknin, E Hill, RW Ronning, F Sutherland, M Taillefer, L Petrovic, C Canfield, PC TI Field-induced quantum critical point in CeCoIn5 SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE quantum critical points; non-Fermi liquid behaviors; heavy-fermion snperconductor AB The resistivity of CeCoIn5 was measured down to 20 mK in magnetic fields of tip to 16 T. With increasing field, we observe a suppression of the non-Fermi liquid behavior, rho similar to T, and the development of a Fermi liquid state, with its characteristic rho = rho(0) + AT(2) dependence. The field dependence of the T-2 coefficient shows critical behavior with an exponent of similar to4/3. This is evidence for a new field-induced quantum critical point, occurring in this case at a critical field which coincides with the superconducting upper critical field H-c2. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Paglione, J (reprint author), Univ Toronto, Dept Phys, 60 St George St, Toronto, ON M5S 1A7, Canada. EM paglione@physics.utoronto.ca; louis.taillefer@physique.usherb.ca RI Petrovic, Cedomir/A-8789-2009; Hawthorn, David/I-6491-2012; Canfield, Paul/H-2698-2014 OI Petrovic, Cedomir/0000-0001-6063-1881; Hawthorn, David/0000-0002-7002-0416; NR 17 TC 0 Z9 0 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 705 EP 706 DI 10.1016/j.physc.2004.03.120 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700301 ER PT J AU Carnahan, MA Kaindl, RA Orenstein, J Chemla, DS Oh, S Eckstein, JN AF Carnahan, MA Kaindl, RA Orenstein, J Chemla, DS Oh, S Eckstein, JN TI Nonequilibrium THz conductivity of Bi2Sr2CaCu2O8+delta SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE THz spectroscopy; superconductivity; Bi-2212 ID HIGH-TEMPERATURE SUPERCONDUCTIVITY AB Using high-sensitivity visible-pump/THz-probe spectroscopy we investigate the dynamics of the complex optical conductivity, sigma(omega) = sigma(1)(omega) + isigma(2)(omega), in optimally-doped Bi2Sr2CaCu2O8+delta films directly after photoexcitation. The photoinduced change in the imaginary part Deltasigma(2), indicative of a reduction in the superconducting condensate density, saturates at higher laser-fluences and shows a complete destruction of the condensate. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. RP Carnahan, MA (reprint author), Univ Calif Berkeley, Dept Phys, 1 Cyclotron Rd,Mailstop 02-344, Berkeley, CA 94720 USA. EM macarnahan@lbl.gov RI Orenstein, Joseph/I-3451-2015 NR 11 TC 9 Z9 9 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 729 EP 730 DI 10.1016/j.physc.2004.03.056 PG 2 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700310 ER PT J AU Greene, LH Hentges, PJ Aubin, H Aprili, M Badica, E Covington, M Pafford, MM Westwood, G Klemperer, WG Jian, S Hinks, DG AF Greene, LH Hentges, PJ Aubin, H Aprili, M Badica, E Covington, M Pafford, MM Westwood, G Klemperer, WG Jian, S Hinks, DG TI Detection and control of broken symmetries with Andreev bound state tunneling spectroscopy: effects of atomic-scale disorder SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE planar tunneling spectroscopy; Andreev bound states; broken time-reversal symmetry; unconventional superconductivity; high-temperature superconductivity ID D-WAVE SUPERCONDUCTORS; TIME-REVERSAL-SYMMETRY; HIGH-TEMPERATURE SUPERCONDUCTORS; QUASI-PARTICLE LOCALIZATION; T-C SUPERCONDUCTORS; SURFACE-STATES; THIN-FILMS; IMPURITY STATES; JUNCTIONS; JOSEPHSON AB Quasiparticle planar tunneling spectroscopy is used to study unconventional superconductivity in YBa2Cu3O7 (YBCO) thin films and BiSr2CaCu2O8 (BSCCO) single crystals. Tunneling conductances are obtained as a function of crystallographic orientation, applied magnetic field (magnitude and orientation), atomic substitution and surface damage. Our systematic studies confirm that the observed zero-bias conductance peak (ZBCP), a measure of the near-surface quasiparticle (QP) density of states (DoS), is comprised of Andreev bound states (ABS) resulting directly from the sign change of the d-wave order parameter (OP) at the Fermi surface. Our data, plus a literature search, reveals a consistency in the observation of the splitting of the ZBCP in optimally-doped materials. We note that the splitting of the ZBCP observed in applied field, and the spontaneous splitting observed at lower temperatures in zero field, occur concomitantly in a given junction, and that observation of this splitting is dependent upon two parameters: (1) the magnitude of the tunneling cone and (2) the degree of atomic-scale disorder at the interface. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Illinois, Fredrick Seitz Mat Res Lab, Urbana, IL 61801 USA. Univ Illinois, Dept Chem, Urbana, IL 61801 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA. EM lhg@uiuc.edu NR 33 TC 4 Z9 4 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 804 EP 806 DI 10.1016/j.physc.2004.03.138 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700338 ER PT J AU Palau, A Puig, T Obradors, X Usokin, A Freyhardt, H Fernandez, L Holzapfel, B Feenstra, R Sanchez, A Pardo, E AF Palau, A Puig, T Obradors, X Usokin, A Freyhardt, H Fernandez, L Holzapfel, B Feenstra, R Sanchez, A Pardo, E TI Magnetic granularity analysis of YBCO coated conductors SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors CY MAY 25-30, 2003 CL Rio de Janeiro, BRAZIL DE electromagnetic granularity; inductive measurements; coated conductors ID GRAIN AB We present an inductive analysis of a variety of YBCO coated conductors, based on complementary measurements of a.c.-susceptibility and d.c.-magnetization. The study addresses dissipation mechanisms associated with the grain boundary networks. We show that a.c.-susceptibility measurements are uniquely qualified to identify dissipative contributions from micro structurally inhomogeneous grain boundary networks. (C) 2004 Published by Elsevier B.V. C1 CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain. Zentrum Funkt Wekstoffe, D-37073 Gottingen, Germany. IFW Dresden, D-01069 Dresden, Germany. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. UAB, Grp Electromagnetisme, Bellaterra 08193, Spain. RP Palau, A (reprint author), CSIC, Inst Ciencia Mat Barcelona, Campus UAB, Bellaterra 08193, Spain. EM palau@icmab.es; teresa.puig@icmab.es RI Sanchez, Alvaro/C-7041-2008; Holzapfel, Bernhard/D-3669-2009; Obradors, Xavier/A-8146-2012; Fernandez, Laura/G-5245-2013; Palau, Anna/C-2947-2014; Puig, Teresa/O-1077-2013; OI Fernandez, Laura/0000-0002-4818-1125; Palau, Anna/0000-0002-2217-164X; Puig, Teresa/0000-0002-1873-0488; Sanchez, Alvaro/0000-0002-2988-0289; Pardo, Enric/0000-0002-6375-4227 NR 7 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG PY 2004 VL 408 BP 866 EP 868 DI 10.1016/j.physc.2004.03.224 PG 3 WC Physics, Applied SC Physics GA 856NK UT WOS:000224051700363 ER PT J AU Soneson, J Peleg, A AF Soneson, J Peleg, A TI Effect of quintic nonlinearity on soliton collisions in optical fibers SO PHYSICA D-NONLINEAR PHENOMENA LA English DT Article ID GINZBURG-LANDAU EQUATION; SCHRODINGER-EQUATION; 3RD-ORDER DISPERSION; INTERACTION FORCES; RADIATIVE LOSSES; STABILITY; WAVES; MEDIA; SYSTEMS AB We investigate the effect of quintic nonlinearity on collisions between solitons in different frequency channels in optical fibers. We calculate the intensity and dynamics of the collision-induced emitted radiation and changes in the soliton parameters due to the collision. This is done by means of a perturbation theory with two small parameters: the quintic nonlinearity coefficient epsilon(q), and the reciprocal of the inter-channel frequency difference 1/beta. We find that the amplitude of the collision-induced emitted radiation is proportional to epsilon(q)/beta. This radiation can be described as originating from a,variation in the Kerr nonlinearity coefficient with respect to distance along the fiber. We also find that the only other effect of quintic nonlinearity on the collision up to second order in the perturbation theory is an additional phase shift proportional to epsilon(q)/beta. The results obtained by our numerical simulations of the perturbed nonlinear Schrodinger equation are in very good agreement with theory. (C) 2004 Elsevier B.V. All rights reserved. C1 LANL, Div Theoret, Los Alamos, NM 87545 USA. Univ Arizona, Program Appl Math, Tucson, AZ 85721 USA. RP Peleg, A (reprint author), LANL, Div Theoret, Los Alamos, NM 87545 USA. EM avner@cnls.lanl.gov NR 41 TC 14 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG 1 PY 2004 VL 195 IS 1-2 BP 123 EP 140 DI 10.1016/j.physd.2004.03.016 PG 18 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA 840LY UT WOS:000222861300007 ER PT J AU Mo, H Trogisch, S Taub, H Ehrlich, SN Volkmann, UG Hansen, FY Pino, M AF Mo, H Trogisch, S Taub, H Ehrlich, SN Volkmann, UG Hansen, FY Pino, M TI Structure and growth of dotriacontane films on SiO2 and Ag(111) surfaces: synchrotron X-ray scattering and molecular dynamics simulations SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article; Proceedings Paper CT Conference on Photo-Responsive Materials CY FEB 25-29, 2004 CL Kariega Game Reserve, SOUTH AFRICA SP EMF Ltd, Sensors Unlimited Inc, Carl Zeist Pty, Ltd ID ENERGY ELECTRON-DIFFRACTION; SUBMONOLAYER COVERAGES; CRYSTALLINE-STRUCTURES; NORMAL PARAFFINS; THIN CRYSTALS; ALKANE FILMS; MONOLAYERS; INTERFACES; GRAPHITE; TRIACONTANE AB We report synchrotron X-ray scattering experiments and molecular dynamics simulations of the structure and growth mode of dotriacontane (n-C32H(66) or C32) films adsorbed on Ag(111) and SiO2-coated Si(100) substrates. On the SiO2 surface, the X-ray measurements confirm a structural model of the solid film inferred from high-resolution ellipsometry measurements in which one or two layers of C32 adsorb with the long axis of the molecule oriented parallel to the interface followed by a monolayer in which the molecules have a perpendicular orientation. At higher C32 coverages, preferentially oriented bulk particles nucleate consistent with a Stranski-Krastanov growth mode. On the Ag(l 11) surface, we again observe one or two layers of the "parallel" film but no evidence of the perpendicular monolayer before nucleation of the preferentially oriented bulk particles. We compare the experimentally observed structures with molecular dynamics simulations of a multilayer film of the homologous C24 molecule. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. C1 Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA. Univ Missouri, Res Reactor, Columbia, MO 65211 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. Pontificia Univ Catolica Chile, Fac Fis, Santiago 22, Chile. Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark. RP Taub, H (reprint author), Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA. EM taubh@missouri.edu RI Volkmann, Ulrich/H-1802-2014 NR 18 TC 10 Z9 10 U1 0 U2 2 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0031-8965 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Res. PD AUG PY 2004 VL 201 IS 10 BP 2375 EP 2380 DI 10.1002/pssa.200404894 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA 850LU UT WOS:000223613800030 ER PT J AU Nardelli, MB Walker, FJ McKee, RA AF Nardelli, MB Walker, FJ McKee, RA TI Crystalline oxides on semiconductors: a future for the nanotransistor SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article; Proceedings Paper CT 5th Motorola Workshop on Computational Materials and Electronics CY NOV 13-14, 2003 CL Austin, TX SP Motorola ID SILICON; INTERFACE AB In this paper we will broadly review the promises and advantages that crystalline-oxides-on-semiconductors will bring to semiconductor technology. The central issue in the epitaxial oxide semiconductor system is the role of the interface. Preparation of the semiconductor surface is essential to successful, high quality, crystalline oxide formation. Furthermore, the chemical nature of the surface then controls such fundamental properties of the system as band offsets, band bending and transport. Drawing on recent accomplishments in determining key features in the structural and electronic properties of prototype Si/(Sr,Ba)O interfaces [R. A. McKee, F. J. Walker, M. Buongiorno Nardelli, W. A. Shelton, and G. M. Stocks, Science 300, 1726 (2003)], we will then illustrate how high-performance simulations combined with experiments have been able to characterize an interface phase whose structure-specific chemical bonding is fundamental in determining the properties of the semiconductor/crystalline oxide system. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. C1 N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. Oak Ridge Natl Lab, Ctr Computat Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Comp Sci & Math, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Nardelli, MB (reprint author), N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. EM mbnardelli@ncsu.edu RI Buongiorno Nardelli, Marco/C-9089-2009; OI Walker, Frederick/0000-0002-8094-249X NR 14 TC 8 Z9 8 U1 0 U2 4 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD AUG PY 2004 VL 241 IS 10 BP 2279 EP 2286 DI 10.1002/pssb.200404942 PG 8 WC Physics, Condensed Matter SC Physics GA 847LS UT WOS:000223394700012 ER PT J AU Reiner, JW Walker, FJ McKee, RA Billman, CA Junquera, J Rabe, KM Ahn, CH AF Reiner, JW Walker, FJ McKee, RA Billman, CA Junquera, J Rabe, KM Ahn, CH TI Ferroelectric stability of BaTiO3 in a crystalline oxide on semiconductor structure SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article; Proceedings Paper CT 5th Motorola Workshop on Computational Materials and Electronics CY NOV 13-14, 2003 CL Austin, TX SP Motorola ID ULTRATHIN FILMS; INTERFACE; SILICON AB Recent experimental advances in the ability to grow epitaxial ferroelectrics on semiconductors have provided an opportunity to study the intrinsic properties of these interfaces. It has been reported that a heterostructure of BaTiO3 grown on germanium has a commensurate crystalline oxide interface with a non-zero interface density of states. Including these states in a model of a ferroelectric oxide on a semiconductor substrate with a top metal electrode, we find that the oxide critical thickness necessary for stability of the ferroelectric state with polarization along the interface normal is substantially lowered by the contribution to the screening by the interface states. Materials parameters for BaTiO3 and Ge give a drop in estimated critical thickness from 39 nm to 7 nm. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. C1 Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Knoxville, TN 37996 USA. Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA. Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA. RP Reiner, JW (reprint author), Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA. EM james.reiner@yale.edu RI Junquera, Javier/G-7224-2015; OI Junquera, Javier/0000-0002-9957-8982; Walker, Frederick/0000-0002-8094-249X NR 12 TC 10 Z9 10 U1 1 U2 14 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD AUG PY 2004 VL 241 IS 10 BP 2287 EP 2290 DI 10.1002/pssb.200404932 PG 4 WC Physics, Condensed Matter SC Physics GA 847LS UT WOS:000223394700013 ER PT J AU Danese, AG Yao, H Arena, DA Hochstrasser, M Tobin, JG Bartynski, RA AF Danese, AG Yao, H Arena, DA Hochstrasser, M Tobin, JG Bartynski, RA TI Anomalous thickness dispersion of unoccupied states in the Cu/Ni/Cu(100) metallic quantum well system SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article; Proceedings Paper CT 5th Motorola Workshop on Computational Materials and Electronics CY NOV 13-14, 2003 CL Austin, TX SP Motorola ID COPPER THIN-FILMS; SURFACE-STATES; ELECTRONIC STATES; IMAGE STATES; PHOTOEMISSION; OVERLAYERS; SUBSTRATE; ISLANDS; CU(001) AB We present photoemission and inverse photoemission measurements of the occupied and unoccupied electronic states of the Cu/Ni/Cu(100) system. While the occupied levels of the Cu overlayer display the usual upward dispersion with increasing overlayer thickness, the unoccupied states exhibit an anomalous downward dispersion similar to that seen for the Cu/Ni(100) system. While the anomalous dispersion depends quantitatively on Ni film thickness, and hence on in-plane strain, the qualitative behavior of downward dispersing features is seen for all Ni thicknesses studied. Our results suggest that the origin of the anomalous dispersion is tied to the Cu-overlayer/Ni-film interface. (C) 2004 WILEYNCH Verlag GmbH & Co. KGaA, Weinheim. C1 Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA. Rutgers State Univ, Lab Surface Modificat, Piscataway, NJ 08854 USA. Lawrence Livermore Natl Lab, Div Mat & Chem Sci, Livermore, CA 94550 USA. RP Bartynski, RA (reprint author), Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA. EM bart@physics.rutgers.edu RI Tobin, James/O-6953-2015 NR 27 TC 3 Z9 3 U1 1 U2 3 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD AUG PY 2004 VL 241 IS 10 BP 2358 EP 2362 DI 10.1002/pssb.200404895 PG 5 WC Physics, Condensed Matter SC Physics GA 847LS UT WOS:000223394700023 ER PT J AU Moore, RG Zhang, JD Kalinin, SV Ismail Baddorf, AP Jin, R Mandrus, DG Plummer, EW AF Moore, RG Zhang, JD Kalinin, SV Ismail Baddorf, AP Jin, R Mandrus, DG Plummer, EW TI Surface dynamics of the layered ruthenate Ca1.9Sr0.1RuO4 SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article; Proceedings Paper CT 5th Motorola Workshop on Computational Materials and Electronics CY NOV 13-14, 2003 CL Austin, TX SP Motorola ID METAL-INSULATOR TRANSITIONS; SUPERCONDUCTIVITY AB The strong coupling between electronic, lattice, orbital, and spin degrees of freedom in transition metal oxides implies that the symmetry breaking at the surface of these materials should lead to a rich surface phase diagram and interesting new physics. Here we investigate the surface phases of the Ca2-xSrxRuO4 system that (in bulk) can be tuned from a Mott insulator (x = 0) to a p-wave superconductor (x = 2) without changing the electron count. This system therefore displays a "bandwidth controlled" metal-insulator transition. Electronic and structural properties of these surfaces are studied by variable temperature High Resolution Electron Energy Loss Spectroscopy (HREELS) and Low Energy Electron Diffraction (LEED). It is found that broken symmetry on the Sr2RuO4 Surface results in the rotation of RuO4 octahedra relative to bulk positions along the c-axis, changing the relative in-plane Ru-O bond length and shifting the surface phonon energies. The substitution of Ca ions in Sr2RuO4 crystals results in a rotation plus a tilt of the RuO6 octahedra creating a Mott-insulator phase. In particular, Ca1.9Sr0.1RuO4 exhibits a Mott transition below 154 K in bulk single crystals. However, with HREELS, we observed phonon and conductivity dynamics at the surface of Ca1.9Sr0.1RuO4 crystals below similar to130 K, indicating a lower surface Mott transition temperature than in the bulk. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Florida Int Univ, Dept Phys, Miami, FL 33199 USA. RP Moore, RG (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. EM rgmoore@utk.edu RI Kalinin, Sergei/I-9096-2012; Mandrus, David/H-3090-2014; Baddorf, Arthur/I-1308-2016 OI Kalinin, Sergei/0000-0001-5354-6152; Baddorf, Arthur/0000-0001-7023-2382 NR 14 TC 3 Z9 3 U1 1 U2 4 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD AUG PY 2004 VL 241 IS 10 BP 2363 EP 2366 DI 10.1002/pssb.200404874 PG 4 WC Physics, Condensed Matter SC Physics GA 847LS UT WOS:000223394700024 ER PT J AU Tang, SJ Shi Jr Wu, B Sprunger, PT Yang, WL Brouet V Zhou, XJ Hussain, Z Shen, ZA Zhang, ZY Plummer, EW AF Tang, SJ Shi, JR Wu, B Sprunger, PT Yang, WL Brouet, V Zhou, XJ Hussain, Z Shen, ZA Zhang, ZY Plummer, EW TI A spectroscopic view of electron-phonon coupling at metal surfaces SO PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS LA English DT Article; Proceedings Paper CT 5th Motorola Workshop on Computational Materials and Electronics CY NOV 13-14, 2003 CL Austin, TX SP Motorola ID ANGLE-RESOLVED PHOTOEMISSION; BE(0001) SURFACE; MAXIMUM-ENTROPY; STATES; SUPERCONDUCTIVITY; VIBRATIONS; SPECTRUM; ENERGY AB It is now possible to extract from high-resolution angle-resolved photoemission data the Eliashberg function alpha(2)F(omega) for electron-phonon coupling (EPC). At the same time, first-principles calculations of the EPC for surface states are appearing in the literature presenting an exquisite picture of the origin of the Eliashberg function. The advances in this field will be illustrated with new data from surface states on two faces of berylium and a direct comparisin to theory for Be(0001). (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. Univ Texas, Dept Phys, Austin, TX 78712 USA. Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. Stanford Univ, Dept Phys, Appl Phys & Stanford Synchtrotron Radiat Lab, Stanford, CA 94305 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Plummer, EW (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. EM eplummer@utk.edu RI Wu, Biao/B-3329-2008; Shi, Junren/D-5156-2009; Yang, Wanli/D-7183-2011 OI Wu, Biao/0000-0001-9229-5894; Yang, Wanli/0000-0003-0666-8063 NR 37 TC 8 Z9 8 U1 1 U2 5 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Solid State Phys. PD AUG PY 2004 VL 241 IS 10 BP 2345 EP 2352 DI 10.1002/pssb.200404890 PG 8 WC Physics, Condensed Matter SC Physics GA 847LS UT WOS:000223394700021 ER PT J AU Budker, D Rochester, SM AF Budker, D Rochester, SM TI Relation between electromagnetically induced absorption resonances and nonlinear magneto-optics in Lambda systems SO PHYSICAL REVIEW A LA English DT Article ID RB VAPOR; LIGHT; SLOW; SPECTROSCOPY; TRANSPARENCY; EXCITATION AB Recent work on Lambda resonances in alkali-metal vapors (E. Mikhailov, I. Novikova, Yu. V. Rostovtsev, and G. R. Welch, e-print quant-ph/0309171, and references therein) investigated a type of electromagnetically induced absorption resonance that occurs in three-level systems under specific conditions normally associated with electromagnetically induced transparency. In this note, we show that these resonances have a direct analog in nonlinear magneto-optics, and support this conclusion with a calculation for a J=1-->J(')=0 system interacting with a single, nearly circularly polarized light field in the presence of a weak longitudinal magnetic field. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Budker, D (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM budker@socrates.berkeley.edu; simonkeys@yahoo.com RI Budker, Dmitry/F-7580-2016 OI Budker, Dmitry/0000-0002-7356-4814 NR 18 TC 5 Z9 5 U1 1 U2 6 PU AMERICAN 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 AUG PY 2004 VL 70 IS 2 AR 025804 DI 10.1103/PhysRevA.70.025804 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 851WO UT WOS:000223717400149 ER PT J AU Menotti, C Kramer, M Smerzi, A Pitaevskii, L Stringari, S AF Menotti, C Kramer, M Smerzi, A Pitaevskii, L Stringari, S TI Propagation of sound in a Bose-Einstein condensate in an optical lattice SO PHYSICAL REVIEW A LA English DT Article ID ATOMS; SUPERFLUID; EXCITATIONS; DYNAMICS; TRAPS; GAS AB We study the propagation of sound waves in a Bose-Einstein condensate trapped in a one-dimensional optical lattice. We find that the velocity of the propagation of sound wave packets decreases with increasing optical lattice depth, as predicted by the Bogoliubov theory. The strong interplay between nonlinearities and the periodicity of the external potential generates phenomena that are not present in the uniform case. Shock waves, for instance, can propagate slower than sound waves, due to the negative curvature of the dispersion relation. Moreover, nonlinear corrections to the Bogoliubov theory appear to be important even with very small density perturbations, inducing a saturation of the amplitude of the sound signal. C1 Univ Trent, Ist Nazl Fis Mat, BEC CRS, I-38050 Povo, Italy. Univ Trent, Dipartimento Fis, I-38050 Povo, Italy. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Kapitza Inst Phys Problems, Moscow 117334, Russia. RP Menotti, C (reprint author), Univ Trent, Ist Nazl Fis Mat, BEC CRS, I-38050 Povo, Italy. OI Stringari, Sandro/0000-0002-5960-0612 NR 34 TC 22 Z9 23 U1 0 U2 6 PU AMERICAN 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 AUG PY 2004 VL 70 IS 2 AR 023609 DI 10.1103/PhysRevA.70.023609 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 851WO UT WOS:000223717400109 ER PT J AU Robbins, DL Faenov, AY Pikuz, TA Chen, H Beiersdorfer, P May, MJ Dunn, J Reed, KJ Smith, AJ AF Robbins, DL Faenov, AY Pikuz, TA Chen, H Beiersdorfer, P May, MJ Dunn, J Reed, KJ Smith, AJ TI Measurement of the polarization of the K-shell resonance line emission of S13+ and S14+ at relativistic electron beam energies SO PHYSICAL REVIEW A LA English DT Article ID LASER-PRODUCED PLASMAS; HIGHLY-CHARGED IONS; X-RAY SPECTROMETER; HE-LIKE; SATELLITE LINES; EXCITATION; IMPACT; SPECTROPOLARIMETRY; SPECTROSCOPY; TRANSITIONS AB We have measured the polarization of the heliumlike sulfur resonance line 1s2p P-1(1)-->1s(2) S-1(0) and of the blend of the lithiumlike sulfur resonance lines 1s2s2p P-2(3/2)-->1s(2)2s S-2(1/2) and 1s2s2p P-2(1/2)-->1s(2)2s S-2(1/2) as a function of electron beam energy from near threshold to 144 keV. These lines were excited with the LLNL high-energy electron beam ion trap and measured using a newly modified two-crystal technique. Our results test polarization predictions in an energy regime where few empirical results have been reported. We also present calculations of the polarization using two different methods, and good agreement is obtained. C1 Morehouse Coll, Dept Phys, Atlanta, GA 30314 USA. VNIIFTRI, Multicharged Ions Spectra Data Ctr, Mendeleyevsk 141570, Moscow Region, Russia. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Robbins, DL (reprint author), Morehouse Coll, Dept Phys, Atlanta, GA 30314 USA. NR 26 TC 26 Z9 27 U1 0 U2 2 PU AMERICAN 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 AUG PY 2004 VL 70 IS 2 AR 022715 DI 10.1103/PhysRevA.70.022715 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 851WO UT WOS:000223717400078 ER PT J AU Turri, G Snell, G Langer, B Martins, M Kukk, E Canton, SE Bilodeau, RC Cherepkov, N Bozek, JD Kilcoyne, AL Berrah, N AF Turri, G Snell, G Langer, B Martins, M Kukk, E Canton, SE Bilodeau, RC Cherepkov, N Bozek, JD Kilcoyne, AL Berrah, N TI Spin- and angle-resolved spectroscopy of S 2p photoionization in the hydrogen sulfide molecule SO PHYSICAL REVIEW A LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; ANGULAR-DISTRIBUTION; POLARIZATION; ATOMS; H2S; PHOTOEMISSION; ELECTRONS; FIELD; OCS; KR AB Angle- and spin-resolved photoelectron spectroscopy with circularly and linearly polarized synchrotron radiation were used to study the electronic structure of the hydrogen sulfide molecule. A strong effect of the molecular environment appears in the spin-resolved measurements and, although less clearly, in the angular distribution of the sulfur 2p photoelectrons. The anisotropy and spin parameters of the three main spectral components have been obtained. The validity of simple atomic models in explaining the results is discussed. C1 Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Div, Berkeley, CA 94720 USA. Max Born Inst, D-12489 Berlin, Germany. Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany. Univ Oulu, Dept Phys Sci, FIN-90014 Oulu, Finland. State Univ Aerosp Instrumentat, St Petersburg 190000, Russia. RP Turri, G (reprint author), Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA. RI Bozek, John/E-4689-2010; Langer, Burkhard/A-6504-2013; Bozek, John/E-9260-2010; Canton, Sophie/A-8432-2016; Kilcoyne, David/I-1465-2013; OI Bozek, John/0000-0001-7486-7238; Bilodeau, Rene/0000-0001-8607-2328; Martins, Michael/0000-0002-1228-5029 NR 22 TC 4 Z9 4 U1 0 U2 4 PU AMERICAN 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 AUG PY 2004 VL 70 IS 2 AR 022515 DI 10.1103/PhysRevA.70.022515 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 851WO UT WOS:000223717400063 ER PT J AU Akbarzadeh, AR Bellaiche, L Leung, K Iniguez, J Vanderbilt, D AF Akbarzadeh, AR Bellaiche, L Leung, K Iniguez, J Vanderbilt, D TI Atomistic simulations of the incipient ferroelectric KTaO3 SO PHYSICAL REVIEW B LA English DT Article ID GENERALIZED GRADIENT APPROXIMATION; STRUCTURAL PHASE-TRANSITIONS; 1ST-PRINCIPLES THEORY; 1ST PRINCIPLES; ELECTRON-GAS; BATIO3; PEROVSKITES; SCATTERING; KNBO3; MICROREGIONS AB A parameterized effective Hamiltonian approach is used to investigate KTaO3. We find that the experimentally observed anomalous dielectric response of this incipient ferroelectric is well reproduced by this approach, once quantum effects are accounted for. Quantum fluctuations suppress the paraelectric-to-ferroelectric phase transition; it is unnecessary to introduce defects to explain the dielectric behavior. The resulting quantum-induced local structure exhibits off-center atomic displacements that display longitudinal, needle-like correlations extending a few lattice constants. C1 Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA. Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA. Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA. RP Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA. RI Iniguez, Jorge/B-6856-2009; OI Iniguez, Jorge/0000-0001-6435-3604; Vanderbilt, David/0000-0002-2465-9091 NR 34 TC 31 Z9 31 U1 0 U2 17 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 AUG PY 2004 VL 70 IS 5 AR 054103 DI 10.1103/PhysRevB.70.054103 PG 5 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100030 ER PT J AU Bakos, T Rashkeev, SN Pantelides, ST AF Bakos, T Rashkeev, SN Pantelides, ST TI Optically active defects in SiO2: The nonbridging oxygen center and the interstitial OH molecule SO PHYSICAL REVIEW B LA English DT Article ID HOLE-CENTERS; SILICA; LUMINESCENCE; HYDROGEN; CRYSTALLINE; INTERFACES; ABSORPTION; DYNAMICS; SI-SIO2; ORIGIN AB Irradiation of high-OH containing amorphous SiO2 is known to introduce a broad absorption band at 4.8 eV and an associated sharp photoluminescence band in the visible red domain, at 1.9 eV. Both absorption and luminescence bands have been unambigously attributed to the nonbridging oxygen (NBO) center, a common defect in irradiated SiO2. Using results of first-principles calculations we show that the NBO center and the interstitial OH molecule (OHi) may both be responsible for the observed absorption and luminescence bands. Although the absorption spectra of the two defects are very similar, their luminescence spectra are different, but overlapping. We found that the NBO center has a sharp luminescence line centered around 1.8 eV in the visible red, whereas OHi molecules have a wide emission spectrum ranging from the infrared (0.8 eV) to visible red (1.8 eV). Investigation of the results show that the difference in the emission spectra is due to the different extent of atomic and electronic relaxations around the two defects: in the case of the NBO, site-independent electronic relaxations are responsible for the defect emitting a photon only at a particular energy, whereas in the case of OHi molecules an interplay between site-dependent atomic and (therefore site-dependent) electronic relaxations result in a wide emission spectrum. A further, intriguing result is that both defects show similar vibrational and polarization properties, therefore their contribution to the red luminescence band of irradiated amorphous SiO2 may not have been decoupled in previous studies. C1 Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Bakos, T (reprint author), Univ Massachusetts, Dept Chem Engn, Amherst, MA 01003 USA. NR 26 TC 23 Z9 23 U1 0 U2 6 PU AMERICAN 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 AUG PY 2004 VL 70 IS 7 AR 075203 DI 10.1103/PhysRevB.70.075203 PG 9 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600045 ER PT J AU Batyrev, IG Kleinman, L Leiro, J AF Batyrev, IG Kleinman, L Leiro, J TI Rumpled relaxation and surface core-level shift in PbS(001) SO PHYSICAL REVIEW B LA English DT Article ID ATOMIC GEOMETRY; PBS; SEMICONDUCTORS; PBTE AB The surface relaxation of the PbS (001) surface has been calculated by the all-electron full potential linear augmented-plane-wave method. Surface core level shifts have been estimated at different atomic sites of the rumpled surface of the crystal. The rumpling is such that the cations are slightly below the anions in the surface layer. Comparison with recent experimental measurements by x-ray photoemission spectroscopy shows good agreement. The initial state approximation slightly overestimates the value of the surface core level shifts (SCLS) whereas the final state effect reduces the SCLS. It is shown that the Madelung potential cannot explain the shifts. C1 Univ Texas, Dept Phys, Austin, TX 78712 USA. Univ Turku, Mat Sci Lab, Turku 20014, Finland. RP Batyrev, IG (reprint author), NREL, 1617 Cole Blvd, Golden, CO 80401 USA. NR 22 TC 7 Z9 7 U1 0 U2 3 PU AMERICAN 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 AUG PY 2004 VL 70 IS 7 AR 073310 DI 10.1103/PhysRevB.70.073310 PG 3 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600017 ER PT J AU Beloborodov, IS Lopatin, AV Schwiete, G Vinokur, VM AF Beloborodov, IS Lopatin, AV Schwiete, G Vinokur, VM TI Tunneling density of states of granular metals SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION; FILMS AB We investigate the effect of Coulomb interactions on the tunneling density of states (DOS) of granular metallic systems at the onset of Coulomb blockade regime in two and three dimensions (d=2,3). Using the renormalization group technique we derive the analytical expressions for the DOS as a function of temperature T and energy epsilon. We show that samples with the bare intergranular tunneling conductance g(T)(0) less than the critical value g(T)(C)=(1/2pid)ln(E-C/delta), where E-C and delta are the charging energy and the mean energy level spacing in a single grain, respectively, are insulators with a hard gap in the DOS at temperatures T-->0. In 3d systems the critical conductance g(T)(C) separates insulating and metallic phases at zero temperature, whereas in the granular films g(T)(C) separates insulating states with the hard (at g(T)(0)g(T)(C)) gaps. The gap in the DOS begins to develop at temperatures T*similar toE(C)g(T)(0) exp(-2pidg(T)(0)) and reaches the value Deltasimilar toT* at T-->0. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Ruhr Univ Bochum, D-44780 Bochum, Germany. RP Beloborodov, IS (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Schwiete, Georg/L-5462-2013 NR 12 TC 14 Z9 16 U1 1 U2 3 PU AMERICAN 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 AUG PY 2004 VL 70 IS 7 AR 073404 DI 10.1103/PhysRevB.70.073404 PG 4 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600024 ER PT J AU Bezuglyi, EV Bratus', EN Shumeiko, VS Vinokur, V AF Bezuglyi, EV Bratus', EN Shumeiko, VS Vinokur, V TI Phase-dependent counting statistics in a short-arm Andreev interferometer SO PHYSICAL REVIEW B LA English DT Article ID MULTITERMINAL DIFFUSIVE CONDUCTORS; DISORDERED CONDUCTORS; NOISE; SUPERCONDUCTOR; UNIVERSALITY; REFLECTION; TRANSPORT; ELECTRON; STATES AB We calculate analytically the full counting statistics for short normal metal-superconductor junctions for arbitrary voltages and temperatures. We also consider the phase oscillations of the cumulant-generating function in Andreev interferometers. At T=0 and at applied voltage much smaller than the proximity gap Delta(phi), the current noise P-I doubles and the third current cumulant C-3 is 4 times larger compared to the normal state; at eVmuch greater thanDelta(phi) they acquire large excess components. At the gap edge, eV=Delta(phi), the differential shot noise dP(I)/dV exhibits sharp peak, while the differential Fano factor dP(I)/dI turns to zero along with the differential resistance, which reflects the transmission resonance associated with the singularity of the density of states. At nonzero temperature, C-3 shows a nonmonotonous voltage dependence with a dip near eV=Delta(phi); the zero-bias slope of C-3(V) is much larger (up to 5 times) than at the zero temperature. C1 Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine. Argonne Natl Lab, Argonne, IL 60439 USA. Chalmers, S-41296 Gothenburg, Sweden. RP Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine. NR 43 TC 3 Z9 3 U1 2 U2 2 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 AUG PY 2004 VL 70 IS 6 AR 064507 DI 10.1103/PhysRevB.70.064507 PG 8 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300072 ER PT J AU Boukhvalov, DW Dobrovitski, VV Katsnelson, MI Lichtenstein, AI Harmon, BN Kogerler, P AF Boukhvalov, DW Dobrovitski, VV Katsnelson, MI Lichtenstein, AI Harmon, BN Kogerler, P TI Electronic structure and exchange interactions in V-15 magnetic molecules: LDA+U results SO PHYSICAL REVIEW B LA English DT Article ID CORRELATED SYSTEMS; SPIN SYSTEM; BAND THEORY; INSULATORS; CLUSTERS AB Single-molecule magnets of the type V-15(K-6[V15As6O42(H2O)].8H(2)O) have attracted a great deal of attention recently, being promising systems for studying low-temperature spin-relaxation and quantum-spin tunneling. To understand in detail the internal magnetic and electronic structure, and the intramolecular interactions responsible for the formation and low-energy excitations in V-15 molecules, we have performed electronic structure calculations using the LSDA+U approach. The calculated values of magnetic moments and charge states of vanadium ions agree well with experiments, thus confirming the V4+ state of vanadium ions with a well-defined spin 1/2. We found that the account of the on-site Coulomb repulsion is important for correct description of V-15 internal properties; in particular, for the values of the on-site repulsion parameter Usimilar to4-5 eV, we can achieve good agreement with known properties of V-15, such as the temperature dependence of susceptibility, and the energies of the low-lying eigenstates of the spin Hamiltonian. C1 Forschungszentrum Julich, D-52425 Julich, Germany. Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620219, Russia. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Uppsala Univ, Dept Phys, SE-75121 Uppsala, Sweden. Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands. RP Boukhvalov, DW (reprint author), Forschungszentrum Julich, Postfach 1913, D-52425 Julich, Germany. RI Katsnelson, Mikhail/D-4359-2012; Kogerler, Paul/H-5866-2013; Lichtenstein, Alexander/K-8730-2012 OI Kogerler, Paul/0000-0001-7831-3953; Lichtenstein, Alexander/0000-0003-0152-7122 NR 27 TC 31 Z9 31 U1 0 U2 1 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 AUG PY 2004 VL 70 IS 5 AR 054417 DI 10.1103/PhysRevB.70.054417 PG 7 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100064 ER PT J AU Choi, J Woodward, JD Musfeldt, JL Wei, X Whangbo, MH He, J Jin, R Mandrus, D AF Choi, J Woodward, JD Musfeldt, JL Wei, X Whangbo, MH He, J Jin, R Mandrus, D TI Magneto-optical properties of Li0.9Mo6O17: Color change in applied magnetic field SO PHYSICAL REVIEW B LA English DT Article ID PURPLE BRONZE LI0.9MO6O17; ELECTRONIC-STRUCTURE; MOLYBDENUM BRONZE; CRYSTAL-STRUCTURE; FERMI-SURFACE; CONDUCTOR; TRANSITION; SYSTEMS; NBSE3 AB The polarized magneto-optical response of Li0.9Mo6O17 was measured in order to investigate the effect of a high magnetic field on the optical properties of a quasi-one-dimensional conductor. The observed magnetochromic effect is attributed to field-induced changes in the density of states near the Fermi level and is manifest in both Mo d-->d on-site and O p-->Mo d charge transfer excitations. The observed polarization dependence of the field-induced color change is consistent with the low energy scale of this effect. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Choi, J (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. RI Mandrus, David/H-3090-2014 NR 32 TC 11 Z9 11 U1 1 U2 15 PU AMERICAN 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 AUG PY 2004 VL 70 IS 8 AR 085107 DI 10.1103/PhysRevB.70.085107 PG 4 WC Physics, Condensed Matter SC Physics GA 851WH UT WOS:000223716700029 ER PT J AU Chumak, AA Milonni, PW Berman, GP AF Chumak, AA Milonni, PW Berman, GP TI Effects of electrostatic fields and Casimir force on cantilever vibrations SO PHYSICAL REVIEW B LA English DT Article ID MU-M; SOLIDS; FLUCTUATIONS; FRICTION; MICROSCOPY; PRESSURE; SYSTEMS; RANGE AB The effect of an external bias voltage and fluctuating electromagnetic fields on both the fundamental frequency and damping of cantilever vibrations is considered. An external voltage induces surface charges causing cantilever-sample electrostatic attraction. A similar effect arises from charged defects in dielectrics that cause spatial fluctuations of electrostatic fields. The cantilever motion results in charge displacements giving rise to Joule losses and damping. It is shown that the dissipation increases with decreasing conductivity and thickness of the substrate, a result that is potentially useful for sample diagnostics. Fluctuating electromagnetic fields between the two surfaces also induce attractive (Casimir) forces. It is shown that the shift in the cantilever fundamental frequency due to the Casimir force is close to the shift observed in recent experiments of Stipe Both the electrostatic and Casimir forces have a strong effect on the cantilever eigenfrequencies, and both effects depend on the geometry of the cantilever tip. We consider cylindrical, spherical, and ellipsoidal tips moving parallel to a flat sample surface. The dependence of the cantilever effective mass and vibrational frequencies on the geometry of the tip is studied both numerically and analytically. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Natl Acad Sci Ukraine, Inst Phys, UA-03650 Kiev, Ukraine. RP Chumak, AA (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 31 TC 29 Z9 29 U1 0 U2 4 PU AMERICAN 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 AUG PY 2004 VL 70 IS 8 AR 085407 DI 10.1103/PhysRevB.70.085407 PG 9 WC Physics, Condensed Matter SC Physics GA 851WH UT WOS:000223716700081 ER PT J AU Entin-Wohlman, O Imry, Y Aharony, A AF Entin-Wohlman, O Imry, Y Aharony, A TI Effects of external radiation on biased Aharonov-Bohm rings SO PHYSICAL REVIEW B LA English DT Article ID NORMAL-METAL RINGS; INDUCED PERSISTENT CURRENT; QUANTUM-DOT; ORBITAL MAGNETIZATION; IMPURITY CONDUCTION; MESOSCOPIC RING; KONDO RESONANCE; HOPPING REGIME; DEPHASING RATE; CURRENTS AB We consider the currents flowing in a solid-state interferometer under the effect of both an Aharonov-Bohm phase and a bias potential. Expressions are obtained for these currents, allowing for electronic or electron-boson interactions, which may take place solely on a quantum dot placed on one of the interferometer arms. The boson system can be out of equilibrium. The results are used to obtain the transport current through the interferometer, and the current circulating around it under the effect of the Aharonov-Bohm flux. The modifications of both currents, brought about by coupling the quantum dot to an incoherent sonic or electromagnetic source, are then analyzed. By choosing the appropriate range of the boson source intensity and its frequency, the magnitude of the interference-related terms of both currents can be controlled. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel. Weizmann Inst Sci, Albert Einstein Minerva Ctr Theoret Phys, IL-76100 Rehovot, Israel. Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel. RP Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI ENTIN, ORA/F-1114-2012 NR 94 TC 17 Z9 17 U1 0 U2 2 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 AUG PY 2004 VL 70 IS 7 AR 075301 DI 10.1103/PhysRevB.70.075301 PG 15 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600053 ER PT J AU Fritsch, V Bobev, S Moreno, NO Fisk, Z Thompson, JD Sarrao, JL AF Fritsch, V Bobev, S Moreno, NO Fisk, Z Thompson, JD Sarrao, JL TI Antiferromagnetic order in EuRh2(Ga,In)(8) SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTIVITY; TEMPERATURE; INDIUM AB We report the structural, magnetic, thermodynamic, and transport properties of EuRh2Ga8, EuRh2In8, and YbCo2Ga8. While the two former compounds show the onset of antiferromagnetic order at 20 and 5 K respectively, the latter remains nonmagnetic down to lowest temperatures. The electrical resistivity of the magnetic Eu-compounds is nearly unaffected by an external magnetic field, but the nonmagnetic YbCo2Ga8 develops a positive magnetoresistance. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. RP Fritsch, V (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Moreno, Nelson/H-1708-2012; Fritsch, Veronika/P-1352-2016 OI Moreno, Nelson/0000-0002-1672-4340; Fritsch, Veronika/0000-0002-6620-4554 NR 23 TC 7 Z9 7 U1 1 U2 3 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 052410 DI 10.1103/PhysRevB.70.052410 PG 4 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100014 ER PT J AU Grimsditch, M Giovannini, L Montoncello, F Nizzoli, F Leaf, GK Kaper, HG AF Grimsditch, M Giovannini, L Montoncello, F Nizzoli, F Leaf, GK Kaper, HG TI Magnetic normal modes in ferromagnetic nanoparticles: A dynamical matrix approach SO PHYSICAL REVIEW B LA English DT Article ID METALLIC SPIN-GLASSES; COMPUTER-MODEL; RESONANCE; FIELDS; WAVES AB We present a method to compute the magnetic normal modes of a ferromagnetic particle. The method is a hybrid of micromagnetic simulations and a "dynamical matrix" approach similar to that used for vibrational studies. We use the method to calculate the normal modes of an Fe parallelepiped and compare the results with the modes recently extracted from a purely micromagnetic simulation. The results of the two approaches are in excellent agreement. We discuss the pros and cons of both approaches. We also present information on standing waves with wave vector perpendicular to the applied field and on a family of modes localized at the particle ends. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Mat, I-44100 Ferrara, Italy. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Grimsditch, M (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM grimsditch@anl.gov; leaf@mcs.anl.gov; kaper@mcs.anl.gov NR 24 TC 89 Z9 90 U1 0 U2 9 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054409 DI 10.1103/PhysRevB.70.054409 PG 7 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100056 ER PT J AU Gu, JY Bader, SD Zheng, H Mitchell, JF Gordon, JE AF Gu, JY Bader, SD Zheng, H Mitchell, JF Gordon, JE TI Heat capacity of naturally layered SrO(La1-xSrxMnO3)(2) single crystals SO PHYSICAL REVIEW B LA English DT Article ID MAGNETORESISTANCE; CHARGE; ANTIFERROMAGNETISM; SUPERCONDUCTIVITY; LA1.2SR1.8MN2O7; OXIDES; SPIN AB We measured the heat capacity of SrO(La1-xSrxMnO3)(2) single crystals (0.32less than or equal toxless than or equal to0.64) in the temperature range of 3-300 K and in magnetic fields to 9 T. In order to evaluate the magnetic entropy of the system, we compare data for samples of different composition to decompose the lattice and magnetic contributions. We extract the magnetic contribution by using a sample with no long-range magnetic ordering transition to serve as a reference. We find that the magnetic entropy below room temperature is significantly reduced compared to expectations based on localized moments. But a recent model that invokes a Griffith's singularity indicates that the missing entropy can reside at elevated temperatures due to short-range ordered clusters of effective spin 8. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Amherst Coll, Dept Phys, Amherst, MA 01002 USA. RP Gu, JY (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Bader, Samuel/A-2995-2013 NR 25 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054418 DI 10.1103/PhysRevB.70.054418 PG 8 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100065 ER PT J AU Haskel, D Islam, Z Lang, J Kmety, C Srajer, G Pokhodnya, KI Epstein, AJ Miller, JS AF Haskel, D Islam, Z Lang, J Kmety, C Srajer, G Pokhodnya, KI Epstein, AJ Miller, JS TI Local structural order in the disordered vanadium tetracyanoethylene room-temperature molecule-based magnet SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION FINE-STRUCTURE; DEBYE-WALLER FACTORS; NEAR-EDGE STRUCTURE; STRUCTURE AMPLITUDES; CRYSTAL-STRUCTURE; CRITICAL-BEHAVIOR; SPECTRA; MAGNETIZATION AB We determined the vanadium oxidation state and local coordination environment in disordered samples of magnetic V[TCNE](x)(xapproximate to2) prepared by chemical vapor deposition (CVD). Systematic studies of the x-ray absorption near-edge structure (XANES) in this material and reference compounds show that V ions have a valence state near 2+. Extended x-ray absorption fine structure (EXAFS) analysis shows that vanadium ions are coordinated by 6.04+/-0.25 nitrogen atoms at a room-temperature average distance of 2.084(5)A. The local environment is well defined with a distribution of V-N bond lengths comparable to that commonly found in ordered compounds. This distribution is mostly vibrational in origin, with static contributions being at least four fold smaller. The small disorder in V-N distances is a consequence of strong binding between V and TCNE, with an effective local force constant of k=87 N/m. This strong bonding leads to strong nearest neighbor coupling, which for the extended structure of V[TCNE](x) with six N nearest neighbors results in magnetic ordering above room temperature. The strong V-N bonding explains in part the insoluble nature of this compared to other molecule-based magnets. The room-temperature XANES and EXAFS results for the CVD-prepared samples are compared to those for V[TCNE](x) prepared as a powder from CH2Cl2 solvent, which has a similar magnetic ordering temperature but a magnetization that is more strongly temperature dependent. This comparison suggests that coordination of 6 nitrogens around each V(II) with little variation in the V-N distances is important for achieving the high magnetic ordering temperature of 400 K associated with samples made by both the CVD and CH2Cl2 solution methods. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Ohio State Univ, Dept Chem, Columbus, OH 43210 USA. Univ Utah, Dept Chem, Salt Lake City, UT 84112 USA. RP Haskel, D (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. EM haskel@aps.anl.gov NR 43 TC 52 Z9 52 U1 2 U2 11 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054422 DI 10.1103/PhysRevB.70.054422 PG 9 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100069 ER PT J AU Holanova, Z Szabo, P Samuely, P Wilke, RHT Bud'ko, SL Canfield, PC AF Holanova, Z Szabo, P Samuely, P Wilke, RHT Bud'ko, SL Canfield, PC TI Systematic study of two-band/two-gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy SO PHYSICAL REVIEW B LA English DT Article ID SCANNING TUNNELING SPECTROSCOPY; MAGNESIUM DIBORIDE AB Point-contact measurements on the carbon-substituted Mg(B1-xCx)(2) filament/powder samples directly reveal a retention of the two superconducting energy gaps in the whole doping range from x=0 to xapproximate to0.1. The large gap on the sigma-band is decreased in an essentially linear fashion with increasing the carbon concentrations. The changes in the small gap Delta(pi) up to 3.8% C are proportionally smaller and are more difficult to detect but for the heavily doped sample with xapproximate to0.1 and T-c=22 K both gaps are still present, and significantly reduced, consistent with a strong essentially linear, reduction of each gap with the transition temperature. C1 Safarik Univ, Inst Expt Phys SAS & FS, Ctr Low Temp Phys, SK-04353 Kosice, Slovakia. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Safarik Univ, Inst Expt Phys SAS & FS, Ctr Low Temp Phys, SK-04353 Kosice, Slovakia. RI Canfield, Paul/H-2698-2014 NR 31 TC 43 Z9 43 U1 0 U2 5 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 AUG PY 2004 VL 70 IS 6 AR 064520 DI 10.1103/PhysRevB.70.064520 PG 5 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300085 ER PT J AU Hucker, M Chung, K Chand, M Vogt, T Tranquada, JM Buttrey, DJ AF Hucker, M Chung, K Chand, M Vogt, T Tranquada, JM Buttrey, DJ TI Oxygen and strontium codoping of La2NiO4: Room-temperature phase diagrams SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-DIFFRACTION; NEUTRON-DIFFRACTION; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; STRIPE ORDER; TRANSITION; LA2CUO4+DELTA; SEPARATION; HOLES; SPINS AB We present a detailed room-temperature x-ray powder diffraction study on La2-xSrxNiO4+delta with 0less than or equal toxless than or equal to0.12 and 0less than or equal todeltaless than or equal to0.13. For x=0.02, 0.04, and 0.06 the oxygen content phase diagrams of the Sr-doped samples show a similar sequence of pure phases and miscibility gaps as for pure La2NiO4+delta. We find a weak Sr-doping dependence of the delta range for the pure low-temperature orthorhombic (LTO), low-temperature tetragonal, and high-temperature tetragonal (HTT) phases, but overall, the delta ranges of the different phases do not vary strongly for xless than or equal to0.06. Drastic changes are observed for x=0.08 and 0.12, where miscibility gaps successively disappear. For x=0.12 all oxygen-doped samples are in the HTT phase. The mechanism responsible for the suppression of the phase separation seems to involves multiple factors, including the Coulomb interaction between Sr impurities and interstitial oxygens as well as the reduction of the NiO6 octahedral tilt angle. The doping dependence of the lattice parameters shows clear differences for pure Sr and pure O doping. With the exception of the LTO phase, the in-plane lattice parameters explicitly depend on the type of dopant, rather than the net hole content p=x+2delta. In contrast, the orthorhombic strain in the LTO phase as well as the c-axis length appears to depend only on p, however, in the case of the c-axis length this "universal" behavior turns out to be coincidental. Our results also show that the chemical pressure of La-site dopants is highly anisotropic, whereas that of O interstitials appears to be more isotropic. In general, this study reveals that for an investigation of the intrinsic properties of La2-xSrxNiO4 with xless than or similar to0.12, samples have to be annealed carefully to achieve delta=0, since already an excess oxygen content as small as delta=0.01 leads to phase separation. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA. RP Hucker, M (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RI Tranquada, John/A-9832-2009; Vogt, Thomas /A-1562-2011 OI Tranquada, John/0000-0003-4984-8857; Vogt, Thomas /0000-0002-4731-2787 NR 48 TC 4 Z9 4 U1 1 U2 14 PU AMERICAN 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 AUG PY 2004 VL 70 IS 6 AR 064105 DI 10.1103/PhysRevB.70.064105 PG 10 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300025 ER PT J AU Kopnin, NB Mel'nikov, AS Vinokur, VM AF Kopnin, NB Mel'nikov, AS Vinokur, VM TI Reentrant localization of single-particle transport in disordered Andreev wires SO PHYSICAL REVIEW B LA English DT Article ID THERMAL CONDUCTIVITY; INTERMEDIATE STATE; SUPERCONDUCTORS AB We study effects of disorder on the low energy single-particle transport in a normal wire surrounded by a superconductor. In addition to the Andreev diffusion that decreases with increase in the mean free path l, the heat conductance is found to include the diffusive drift produced by a small particle-hole asymmetry, which increases with increasing l. The conductance thus has a minimum as a function of l leading to a peculiar reentrant localization as a function of the mean free path. C1 Helsinki Univ Technol, Low Temp Lab, FIN-02015 Espoo, Finland. LD Landau Theoret Phys Inst, Moscow 117940, Russia. Russian Acad Sci, Inst Phys Microstruct, Nizhnii Novgorod 603950, Russia. Argonne Natl Lab, Argonne, IL 60439 USA. RP Kopnin, NB (reprint author), Helsinki Univ Technol, Low Temp Lab, POB 2200, FIN-02015 Espoo, Finland. RI Mel'nikov, Alexander/E-8099-2017 OI Mel'nikov, Alexander/0000-0002-4241-467X NR 19 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN 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 AUG PY 2004 VL 70 IS 7 AR 075310 DI 10.1103/PhysRevB.70.075310 PG 6 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600062 ER PT J AU Li, TS Morris, JW Chrzan, DC AF Li, TS Morris, JW Chrzan, DC TI Ideal tensile strength of B2 transition-metal aluminides SO PHYSICAL REVIEW B LA English DT Article ID NIAL SINGLE-CRYSTALS; ELECTRONIC-STRUCTURE; CLEAVAGE FRACTURE; TUNGSTEN; STRESS; PHASES; FEAL AB The ideal tensile strengths of the B2-type (CsCl) transition-metal aluminides FeAl, CoAl, and NiAl have been investigated using an ab initio electronic structure total energy method. The three materials exhibit dissimilar mechanical behaviors under the simulated ideal tensile tests along [001], [110], and [111] directions. FeAl is weakest in tension along [001] whereas CoAl and NiAl are strongest in the same direction. The weakness of FeAl along [001] direction is attributed to the instability introduced by the filling of antibonding d states. C1 Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Li, TS (reprint author), Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. RI Li, Tianshu/H-6336-2011 OI Li, Tianshu/0000-0002-0529-543X NR 25 TC 39 Z9 40 U1 3 U2 8 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054107 DI 10.1103/PhysRevB.70.054107 PG 5 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100034 ER PT J AU Metlov, KL Guslienko, KY AF Metlov, KL Guslienko, KY TI Quasiuniform magnetization state in soft ferromagnetic nanocylinders SO PHYSICAL REVIEW B LA English DT Article ID CYLINDER AB A simple analytical ansatz for the quasiuniform "leaf" magnetization state in a thin circular nanocylinder made of soft magnetic material is presented. It is shown that the energy of this state is always lower than the energy of the state with uniform magnetization in the same cylinder. A simple analytical series expansion for the leaf energy is built. Finally, the correction (due to the nonuniformity of the magnetization distribution in the leaf) to the classical result of Joseph for the transition between in-plane and out-of-plane magnetization states in circular cylinder is obtained. It is expressed by a simple formula for the cylinder aspect ratio, corresponding to the transition. C1 Acad Sci Czech Republ, Inst Phys, Prague 18221, Czech Republic. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Metlov, KL (reprint author), Acad Sci Czech Republ, Inst Phys, Prague 18221, Czech Republic. EM metlov@fzu.cz NR 11 TC 15 Z9 15 U1 1 U2 3 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 052406 DI 10.1103/PhysRevB.70.052406 PG 4 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100010 ER PT J AU Palinginis, P Wang, HL Goupalov, SV Citrin, DS Dobrowolska, M Furdyna, JK AF Palinginis, P Wang, HL Goupalov, SV Citrin, DS Dobrowolska, M Furdyna, JK TI Exciton dephasing in self-assembled CdSe quantum dots SO PHYSICAL REVIEW B LA English DT Article ID GAAS AB We report experimental studies of exciton dephasing in self-assembled CdSe quantum dots using techniques based on spectral hole burning. The hole-burning response reveals directly in the spectral domain the zero-phonon-line (ZPL) as well as contributions from acoustic and LO-phonon assisted transitions. The observed strong coupling to acoustic phonons is in good agreement with theoretical expectation. The measured decoherence rate associated with the ZPL is as small as 3.5 mueV, comparable to that in self-assembled InGaAs quantum dots. C1 Univ Oregon, Dept Phys, Eugene, OR 97403 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia. Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RP Univ Oregon, Dept Phys, Eugene, OR 97403 USA. RI Wang, Hailin/A-2362-2011 NR 25 TC 19 Z9 20 U1 3 U2 8 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 AUG PY 2004 VL 70 IS 7 AR 073302 DI 10.1103/PhysRevB.70.073302 PG 4 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600009 ER PT J AU Park, J Brammeier, DP Olson, CG Canfield, PC Lynch, DW AF Park, J Brammeier, DP Olson, CG Canfield, PC Lynch, DW TI Angle-resolved photoemission study of the rare-earth intermetallic compounds: RNi2Ge2 (R=Eu,Gd) SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-STRUCTURES; NI AB Experimental energy bands mapped from normal-emission photoelectron spectra of EuNi2Ge2 and GdNi2Ge2(001) surfaces show four photoemission features that disperse in both materials in good agreement with band calculations. Segments of the Fermi surfaces mapped by angle-resolved photoemission spectroscopy in the GammaXPZ plane of the Brillouin zones for both EuNi2Ge2 and GdNi2Ge2 are in good agreement with band calculations. This Fermi surface segment changes when one electron is added to EuNi2Ge2, corresponding to GdNi2Ge2, based on the rigid-band approximation. C1 Iowa State Univ, Dept Phys, Ames, IA 50011 USA. Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. RP Iowa State Univ, Dept Phys, Ames, IA 50011 USA. RI Canfield, Paul/H-2698-2014 NR 24 TC 4 Z9 4 U1 1 U2 2 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 AUG PY 2004 VL 70 IS 7 AR 075105 DI 10.1103/PhysRevB.70.075105 PG 7 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600030 ER PT J AU Pella, S Faulkner, JS Stocks, GM Ujfalussy, B AF Pella, S Faulkner, JS Stocks, GM Ujfalussy, B TI Electronic structure calculations on alloys using the polymorphous coherent-potential approximation SO PHYSICAL REVIEW B LA English DT Article ID DISORDERED CUXPD1-X ALLOYS; DENSITY-OF-STATES; CU-PD ALLOYS; PHOTOEMISSION SPECTRA; AU-CU; SYSTEMS; ORDER; AG; SCATTERING; AUGER AB We present self-consistent calculations of the electronic density of states of disordered copper-palladium and silver-palladium alloys using the polymorphous coherent-potential approximation and the Korringa-Kohn-Rostoker coherent-potential approximation. We find that the agreement between the theoretical partial density of states of palladium d bands in copper-rich copper-palladium alloys and experiment is significantly improved when the polymorphous coherent-potential approximation is used. The densities of states of silver-palladium alloys calculated with the two versions of the coherent-potential approximation are identical and agree with experiment. This indicates that the improved treatment of Coulomb effects in the polymorphous coherent-potential approximation is necessary only for alloys such as copper palladium that have considerable charge transfer. C1 Florida Atlantic Univ, Dept Phys, Alloy Res Ctr, Boca Raton, FL 33431 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Florida Atlantic Univ, Dept Phys, Alloy Res Ctr, Boca Raton, FL 33431 USA. RI Ujfalussy, Balazs/A-8155-2013; Stocks, George Malcollm/Q-1251-2016 OI Ujfalussy, Balazs/0000-0003-3338-4699; Stocks, George Malcollm/0000-0002-9013-260X NR 30 TC 6 Z9 6 U1 1 U2 5 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 AUG PY 2004 VL 70 IS 6 AR 064203 DI 10.1103/PhysRevB.70.064203 PG 5 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300033 ER PT J AU Perez-Dieste, V Crain, JN Kirakosian, A McChesney, JL Arenholz, E Young, AT Denlinger, JD Ederer, DL Callcott, TA Lopez-Rivera, SA Himpsel, FJ AF Perez-Dieste, V Crain, JN Kirakosian, A McChesney, JL Arenholz, E Young, AT Denlinger, JD Ederer, DL Callcott, TA Lopez-Rivera, SA Himpsel, FJ TI Unoccupied orbitals of 3d transition metals in ZnS SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-ABSORPTION; FERROMAGNETIC SEMICONDUCTORS; SPECTROSCOPY; ALLOYS; HYBRIDIZATION; SPECTRA AB The electronic structure of magnetic impurities in ZnS is determined by near edge x-ray absorption for the 3d transition metals Ti, Mn, Fe, Co, Ni embedded in single crystal ZnS. By detecting emitted fluorescence photons instead of electrons it is possible to suppress the background from the host and to eliminate charging problems. The spectra exhibit considerable fine structure, which makes it possible to determine the tetrahedral crystal field 10Dq from the multiplet pattern: 10Dq=0.5 eV for Mn, 0.7 eV for Fe, 0.7 eV for Co. C1 Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Tulane Univ, Dept Phys, New Orleans, LA 70118 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Univ Los Andes, Lab Fis Aplicada, Merida, Venezuela. RP Perez-Dieste, V (reprint author), Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA. RI McChesney, Jessica/K-8911-2013 OI McChesney, Jessica/0000-0003-0470-2088 NR 37 TC 12 Z9 12 U1 0 U2 5 PU AMERICAN 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 AUG PY 2004 VL 70 IS 8 AR 085205 DI 10.1103/PhysRevB.70.085205 PG 5 WC Physics, Condensed Matter SC Physics GA 851WH UT WOS:000223716700045 ER PT J AU Qian, MC Fong, CY Yang, LH AF Qian, MC Fong, CY Yang, LH TI Coexistence of localized magnetic moment and opposite-spin itinerant electrons in MnC SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-BEAM EPITAXY; ENERGY AB Within the lattice constants ranging from 3.5 to 4.28 Angstrom, we predict that manganese carbide (MnC) will possess a coexistent phase of periodic magnetic moments contributed by the semiconducting majority spin states and itinerant electrons in the minority spin channel. We analyze the effects of hybridization between the d states of the Mn atom and the p states of the C atom, the crystal field effect on the d manifold, and the exchange interactions of the majority and the minority spin states as the lattice constant varies. We point out the physical reason for the occurrence of this form of coexistence. A measurement of saturation magnetization is suggested to determine the presence of this phase. Comparison with its equilibrium lattice constant, 4.39 Angstrom, shows that there is a possibility of growing this compound in thin film forms without suffering an excessive strain on substrates such as boron phosphide and boron nitride. C1 Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Lawrence Livermore Natl Lab, Div H, Livermore, CA 94551 USA. RP Qian, MC (reprint author), Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. NR 15 TC 22 Z9 22 U1 0 U2 3 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 052404 DI 10.1103/PhysRevB.70.052404 PG 4 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100008 ER PT J AU Ray, AK Boettger, JC AF Ray, AK Boettger, JC TI First-principles electronic structure study of the quantum size effects in (111)films of delta-plutonium SO PHYSICAL REVIEW B LA English DT Article ID GENERALIZED GRADIENT APPROXIMATION; RELATIVISTIC LINEAR-COMBINATIONS; DOUGLAS-KROLL TRANSFORMATION; ORBITALS CALCULATIONS; SURFACE ENERGIES; DFT CALCULATIONS; OXIDE SURFACES; METAL-FILMS; DENSITY; PU AB First principles linear combinations of Gaussian-type orbitals-fitting function (LCGTO-FF) electronic structure calculations are used to study thickness dependencies in the surface energies and work functions of ultrathin (111) films of fcc delta-Pu, up to five layers thick. The calculations are carried out at both the scalar- and fully-relativistic (with and without spin-orbit coupling) levels of approximation. The surface energy is shown to be rapidly convergent, while the work function exhibits a strong quantum size effect for all thicknesses considered. The surface energy and work function of the semi-infinite solid are predicted to be 1.12 J/m(2) and 2.85+/-0.20 eV, respectively, for the fully-relativistic case. These results are in substantial disagreement with results from previous electronic structure calculations. The present predictions are in fair agreement with the most recent experimental data for polycrystalline delta-Pu, namely 0.91 J/m(2) and 3.1-3.3 eV, for the surface energy and work function, respectively. C1 Univ Texas, Dept Phys, Arlington, TX 76019 USA. Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA. RP Univ Texas, Dept Phys, POB 19059, Arlington, TX 76019 USA. EM akr@uta.edu NR 62 TC 27 Z9 27 U1 0 U2 3 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 AUG PY 2004 VL 70 IS 8 AR 085418 DI 10.1103/PhysRevB.70.085418 PG 6 WC Physics, Condensed Matter SC Physics GA 851WH UT WOS:000223716700092 ER PT J AU Shi, YG Liu, YL Yang, HX Nie, CJ Jin, R Li, JQ AF Shi, YG Liu, YL Yang, HX Nie, CJ Jin, R Li, JQ TI Raman spectroscopy study of NaxCoO2 and superconducting NaxCoO2 center dot yH(2)O SO PHYSICAL REVIEW B LA English DT Article ID CORRELATED SUPERCONDUCTOR; SCATTERING; SYSTEM AB The Raman spectra of the parent compound NaxCoO2 (x=0.75) and the superconducting oxyhydrates NaxCoO2.yH(2)O with different superconducting temperatures (T-c) have been measured. Five Raman active phonons around 195 cm(-1) (E-1g), 482 cm(-1), 522 cm(-1), 616 cm(-1) (3E(2g)), and 663 cm(-1) (A(1g)) appear in all spectra. These spectra change systematically along with the intercalation of H2O and superconducting properties. In particular, the Raman active phonons (A(1g) and E-1g) involving the oxygen motions within the Co-O layers show up monotonous decrease in frequency along with superconducting temperature T-c. The fundamental properties and alternations of other active Raman phonons in the superconducting materials have also been discussed. C1 Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. RP Yang, HX (reprint author), Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. EM hxyang@blem.ac.cn NR 19 TC 32 Z9 33 U1 0 U2 4 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 052502 DI 10.1103/PhysRevB.70.052502 PG 4 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100016 ER PT J AU Stipcich, M Manosa, L Planes, A Morin, M Zarestky, J Lograsso, T Stassis, C AF Stipcich, M Manosa, L Planes, A Morin, M Zarestky, J Lograsso, T Stassis, C TI Elastic constants of Ni-Mn-Ga magnetic shape memory alloys SO PHYSICAL REVIEW B LA English DT Article ID MARTENSITIC TRANSITION; FERROMAGNETIC NI2MNGA; PHASE-TRANSITIONS; CRYSTAL-STRUCTURE; TRANSFORMATIONS; BEHAVIOR AB We have measured the adiabatic second order elastic constants of two Ni-Mn-Ga magnetic shape memory crystals with different martensitic transition temperatures, using ultrasonic methods. The temperature dependence of the elastic constants has been followed across the ferromagnetic transition and down to the martensitic transition temperature. Within experimental errors no noticeable change in any of the elastic constants has been observed at the Curie point. The temperature dependence of the shear elastic constant C' has been found to be very different for the two alloys. Such a different behavior is in agreement with recent theoretical predictions for systems undergoing multi-stage structural transitions. C1 Univ Barcelona, Fac Fis, Dept Estructura & Constituents Mat, E-08028 Barcelona, Spain. Inst Natl Sci Appl, Grp Etudes Met Phys & Phys Mat, F-69621 Villeurbanne, France. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Univ Ctr Prov Buenos Aires, IFIMAT, RA-7000 Tandil, Argentina. RP Stipcich, M (reprint author), Univ Barcelona, Fac Fis, Dept Estructura & Constituents Mat, Diagonal 647, E-08028 Barcelona, Spain. RI MORIN, Michel/A-2161-2009; Manosa, Lluis/D-8579-2014; Planes, Antoni/O-1904-2015; OI Manosa, Lluis/0000-0002-1182-2670; Planes, Antoni/0000-0001-5213-5714; Stipcich, Marcelo/0000-0003-1514-0703 NR 26 TC 46 Z9 46 U1 2 U2 8 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054115 DI 10.1103/PhysRevB.70.054115 PG 5 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100042 ER PT J AU Su, HB Welch, DO Wong-Ng, W AF Su, HB Welch, DO Wong-Ng, W TI Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; GRAIN-BOUNDARY DISLOCATIONS; T-C SUPERCONDUCTORS; ATOMISTIC SIMULATION; PRESSURE; PHASE; YBA2CU3O7; BA; SOLIDS; SUBSTITUTION AB The energetics of Schottky defects in 123 cuprate superconductor series RBa2Cu3O7 (where R=lanthandies) and YA(2)Cu(3)O(7) (A=alkali earths), were found to have unusual relations if one considers only the volumetric strain. Our calculations reveal the effect of nonuniform changes of interatomic distances within the R-123 structures, introduced by doping homovalent elements, on the Schottky defect formation energy. The energy of formation of Frenkel pair defects, which is an elementary disordering event, in 123 compounds can be substantially altered under both stress and chemical doping. Scaling the oxygen-oxygen short-range repulsive parameter using the calculated formation energy of Frenkel pair defects, the transition temperature between orthorhombic and tetragonal phases is computed by quasichemical approximations (QCA's). The theoretical results illustrate the same trend as the experimental measurements in that the larger the ionic radius of R, the lower the orthorhombic/tetragonal phase transition temperature. This study provides strong evidence of the strain effects on order-disorder transition due to oxygens in the CuO chain sites. C1 SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Mat Sci, Upton, NY 11973 USA. NIST, Div Ceram, Gaithersburg, MD 20899 USA. RP Su, HB (reprint author), CALTECH, Beckman Inst 139 74, Pasadena, CA 91125 USA. EM hbsu@wag.caltech.edu; dwelch@bnl.gov; winnie.wong-ng@nist.gov NR 51 TC 31 Z9 31 U1 1 U2 7 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054517 DI 10.1103/PhysRevB.70.054517 PG 7 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100095 ER PT J AU Su, HB Strachan, A Goddard, WA AF Su, HB Strachan, A Goddard, WA TI Density functional theory and molecular dynamics studies of the energetics and kinetics of electroactive polymers: PVDF and P(VDF-TrFE) SO PHYSICAL REVIEW B LA English DT Article ID VINYLIDENE FLUORIDE COPOLYMERS; FERROELECTRIC PHASE-TRANSITION; POLY(VINYLIDENE FLUORIDE-TRIFLUOROETHYLENE) COPOLYMER; COMPUTER-SIMULATION; TRIFLUOROETHYLENE COPOLYMERS; METALLIC GLASSES; CRYSTALS; MECHANISM; BEHAVIOR; MODEL AB We used first principles methods to study static and dynamical mechanical properties of the ferroelectric polymer poly(vinylidene fluoride) (PVDF) and its copolymer with trifluoro ethylene (TrFE). We use density functional theory [within the generalized gradient approximation (DFT-GGA)] to calculate structure and energetics for various crystalline phases for PVDF and P(VDF-TrFE). We find that the lowest energy phase for PVDF is a nonpolar crystal with a combination of trans (T) and gauche (G) bonds; in the case of the copolymer the role of the extra (bulkier) F atoms is to stabilize T bonds. This leads to the higher crystallinity and piezoelectricity observed experimentally. Using the MSXX first principles-based force field (FF) with molecular dynamics (MD), we find that the energy barrier necessary to nucleate a kink (gauche pairs separated by trans bonds) in an all-T crystal is much lower (14.9 kcal/mol) in P(VDF-TrFE) copolymer than in PVDF (24.8 kcal/mol). This correlates with the observation that the polar phase of the copolymer exhibits a solid-solid transition to a nonpolar phase under heating while PVDF directly melts. We also studied the mobility of an interface between polar and nonpolar phases under uniaxial stress; we find a lower threshold stress and a higher mobility in the copolymer as compared with PVDF. Finally, considering plastic deformation under applied shear, we find that the chains for P(VDF-TrFE) have a very low resistance to sliding, particularly along the chain direction. The atomistic characterization of these "unit mechanisms" provides essential input to mesoscopic or macroscopic models of electro-active polymers. C1 CALTECH, Beckman Inst 139 74, Mat & Proc Simulat Ctr, Pasadena, CA 91125 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP CALTECH, Beckman Inst 139 74, Mat & Proc Simulat Ctr, Pasadena, CA 91125 USA. EM wag@wag.caltech.edu OI Su, Haibin/0000-0001-9760-6567 NR 27 TC 50 Z9 50 U1 3 U2 53 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 AUG PY 2004 VL 70 IS 6 AR 064101 DI 10.1103/PhysRevB.70.064101 PG 8 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300021 ER PT J AU Tuan, AC Bryan, JD Pakhomov, AB Shutthanandan, V Thevuthasan, S McCready, DE Gaspar, D Engelhard, MH Rogers, JW Krishnan, K Gamelin, DR Chambers, SA AF Tuan, AC Bryan, JD Pakhomov, AB Shutthanandan, V Thevuthasan, S McCready, DE Gaspar, D Engelhard, MH Rogers, JW Krishnan, K Gamelin, DR Chambers, SA TI Epitaxial growth and properties of cobalt-doped ZnO on alpha-Al2O3 single-crystal substrates SO PHYSICAL REVIEW B LA English DT Article ID ELECTRICAL SPIN INJECTION; QUANTUM DOTS; THIN-FILMS; FERROMAGNETISM; SEMICONDUCTORS; SPECTROSCOPY; ABSORPTION; STATES; MODEL; CO2 AB Co-doped ZnO(CoxZn1-xO) is of potential interest for spintronics due to the prediction of room-temperature ferromagnetism. We have grown epitaxial CoxZn1-xO films on Al2O3(012) substrates by metalorganic chemical vapor deposition using a liquid precursor delivery system. High concentrations of Co(xless than or equal to0.35) can be uniformly incorporated into the film without phase segregation. Co is found to be in the +2 oxidation state, independent of x, by both surface-sensitive core-level x-ray photoemission and bulk-sensitive optical absorption spectroscopies. This material can be grown n-type by the deliberate incorporation of oxygen vacancies, but not by inclusion of similar to1 at. % Al. Semiconducting films remain ferromagnetic up to 350 K. In contrast films without oxygen vacancies are insulating and nonmagnetic, suggesting that exchange interaction is mediated by itinerant carriers. The saturation and remanent magnetization on a per Co basis was very small (<0.1 mu(B)/Co), even in the best films. The dependence of saturation magnetization, as measured by optical magnetic circular dichroism, on magnetic field and temperature, agrees with the theoretical Brillouin function, demonstrating that the majority of the Co(II) ions behave as magnetically isolated S=3/2 ions. C1 Pacific NW Natl Lab, Fundamental Sci Directorate, Richland, WA 99352 USA. Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA. Univ Washington, Dept Chem, Seattle, WA 98195 USA. Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA. Pac NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Chambers, SA (reprint author), Pacific NW Natl Lab, Fundamental Sci Directorate, Richland, WA 99352 USA. RI Engelhard, Mark/F-1317-2010; Gaspar, Dan/H-6166-2011 NR 38 TC 143 Z9 147 U1 2 U2 34 PU AMERICAN 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 AUG PY 2004 VL 70 IS 5 AR 054424 DI 10.1103/PhysRevB.70.054424 PG 9 WC Physics, Condensed Matter SC Physics GA 851WD UT WOS:000223716100071 ER PT J AU Wang, YL Gao, HJ Guo, HM Liu, HW Batyrev, IG McMahon, WE Zhang, SB AF Wang, YL Gao, HJ Guo, HM Liu, HW Batyrev, IG McMahon, WE Zhang, SB TI Tip size effect on the appearance of a STM image for complex surfaces: Theory versus experiment for Si(111)-(7x7) SO PHYSICAL REVIEW B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; REAL SPACE; SPECTROSCOPY AB Scanning tunneling microscopy experiment and first-principles total energy calculation are combined to determine STM images for Si(111)-7x7 to resolve the long-time discrepancy between theory and experiment. Our experiment resolves clearly and simultaneously the rest and adatom spots, in good agreement with theory, with the rest atom spots almost as bright as those of the central adatoms in the unfaulted-half of the unit cells. Theoretical study suggests that a geometric hindrance effect due to finite tip size could be responsible for the past experimental inability to observe the rest atoms. C1 Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. RI Liu, Hongwen/C-7014-2011; IoP, Nano Lab/B-9663-2013; Krausnick, Jennifer/D-6291-2013; Zhang, Shengbai/D-4885-2013; WANG, Yeliang/D-9643-2012 OI Zhang, Shengbai/0000-0003-0833-5860; NR 20 TC 31 Z9 34 U1 0 U2 21 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 AUG PY 2004 VL 70 IS 7 AR 073312 DI 10.1103/PhysRevB.70.073312 PG 4 WC Physics, Condensed Matter SC Physics GA 851WG UT WOS:000223716600019 ER PT J AU Xu, GY Zhong, Z Bing, Y Ye, ZG Stock, C Shirane, G AF Xu, GY Zhong, Z Bing, Y Ye, ZG Stock, C Shirane, G TI Anomalous phase in the relaxor ferroelectric Pb(Zn1/3Nb2/3)O-3 SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-DIFFRACTION; SINGLE-CRYSTALS; NEUTRON-DIFFRACTION; PBMG1/3NB2/3O3; TRANSITION; BEHAVIOR AB X-ray diffraction studies on a Pb(Zn1/3Nb2/3)O-3 (PZN) single-crystal sample show the presence of two different structures. An outer layer exists in the outer most similar to10 to 50 mum of the crystal, and undergoes a structural phase transition at the Curie temperature T(C)approximate to410 K. The inside phase is, however, very different. The lattice inside the crystal maintains a cubic unit cell, while ferroelectric polarization develops below T-C. The lattice parameter of the cubic unit cell remains virtually a constant, i.e., much less variations compared to that of a typical relaxor ferroelectric, in a wide temperature range of 15 to 750 K. On the other hand, broadening of Bragg peaks and change of Bragg profile line shapes in both longitudinal and transverse directions at T-C clearly indicate a structural phase transition occurring. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada. Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. RP Xu, GY (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Xu, Guangyong/A-8707-2010 OI Xu, Guangyong/0000-0003-1441-8275 NR 27 TC 37 Z9 37 U1 1 U2 9 PU AMERICAN 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 AUG PY 2004 VL 70 IS 6 AR 064107 DI 10.1103/PhysRevB.70.064107 PG 6 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300027 ER PT J AU Yin, WG Liu, JJ Duan, CG Mei, WN Smith, RW Hardy, JR AF Yin, WG Liu, JJ Duan, CG Mei, WN Smith, RW Hardy, JR TI Superionicity in Na3PO4: A molecular dynamics simulation SO PHYSICAL REVIEW B LA English DT Article ID PADDLE-WHEEL MECHANISM; PHASE-TRANSITIONS; CRYSTAL-STRUCTURE; SODIUM-PHOSPHATE; SULFATE; CONDUCTORS; DIFFRACTION; ANIONS; SOLIDS; K2SEO4 AB Fast ionic conduction in solid Na3PO4 is studied by use of molecular dynamics simulation based on the modified Lu-Hardy approach. We obtain reasonable agreement with experiment for the structural transition and diffusion of the sodium ions. All the sodium ions are found to contribute comparably to the high ionic conductivity. The results of the simulation are discussed in terms of the relative magnitude of the two proposed transport mechanisms: percolation and paddle-wheel. It appears to us that the percolation mechanism dominates the sodium diffusion. C1 Univ Nebraska, Dept Phys, Omaha, NE 68182 USA. Univ Nebraska, Dept Phys, Lincoln, NE 68588 USA. Univ Nebraska, Ctr Electroopt, Lincoln, NE 68588 USA. Univ Nebraska, Dept Chem, Omaha, NE 68182 USA. RP Yin, WG (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM wyin@bnl.gov RI Duan, Chun-Gang/D-2755-2013; Yin, Weiguo/A-9671-2014 OI Yin, Weiguo/0000-0002-4965-5329 NR 25 TC 3 Z9 3 U1 4 U2 16 PU AMERICAN 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 AUG PY 2004 VL 70 IS 6 AR 064302 DI 10.1103/PhysRevB.70.064302 PG 6 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300035 ER PT J AU Zepeda-Ruiz, LA Rottler, J Han, SW Ackland, GJ Car, R Srolovitz, DJ AF Zepeda-Ruiz, LA Rottler, J Han, SW Ackland, GJ Car, R Srolovitz, DJ TI Strongly non-Arrhenius self-interstitial diffusion in vanadium SO PHYSICAL REVIEW B LA English DT Article ID COMPUTER-SIMULATION; MOLECULAR-DYNAMICS; DEFECT PRODUCTION; ATOM CLUSTERS; METALS; MIGRATION; BCC; DAMAGE; DISPLACEMENT; MOBILITY AB We study diffusion of self-interstitial atoms (SIAs) in vanadium via molecular-dynamics simulations. The <111>-split interstitials are observed to diffuse one-dimensionally at low temperature, but rotate into other <111> directions as the temperature is increased. The SIA diffusion is highly non-Arrhenius. At T<600 K, this behavior arises from temperature-dependent correlations. At T>600 K, the Arrhenius expression for thermally activated diffusion breaks down when the migration barriers become small compared to the thermal energy. This leads to Arrhenius diffusion kinetics at low T and diffusivity proportional to temperature at high T. C1 Princeton Univ, Princeton Inst Sci & Technol Mat PRISM, Princeton, NJ 08544 USA. Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. Univ Edinburgh, Sch Phys, Edinburgh EH9 3JZ, Midlothian, Scotland. RP Zepeda-Ruiz, LA (reprint author), Princeton Univ, Princeton Inst Sci & Technol Mat PRISM, Princeton, NJ 08544 USA. EM zepedaruiz1@11n1.gov RI Rottler, Joerg/L-5539-2013; Ackland, Graeme/H-2215-2015 OI Rottler, Joerg/0000-0002-5273-7480; Ackland, Graeme/0000-0002-1205-7675 NR 21 TC 18 Z9 18 U1 3 U2 10 PU AMERICAN 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 AUG PY 2004 VL 70 IS 6 AR 060102 DI 10.1103/PhysRevB.70.060102 PG 4 WC Physics, Condensed Matter SC Physics GA 851WE UT WOS:000223716300002 ER PT J AU Zhang, PH Luo, WD Crespi, VH Cohen, ML Louie, SG AF Zhang, PH Luo, WD Crespi, VH Cohen, ML Louie, SG TI Doping effects on the electronic and structural properties of CoO2: An LSDA+U study SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL COMPOUNDS; DENSITY-FUNCTIONAL THEORY; NACO2O4; SUPERCONDUCTIVITY; THERMOPOWER; INSULATORS; SOLIDS AB A systematic local spin density approximation (LSDA)+U study of doping effects on the electronic and structural properties of single layer CoO2 is presented. Undoped CoO2 is a charge transfer insulator within LSDA+U and a metal with a high density of states (DOS) at the Fermi level within LSDA. (CoO2)(1.0-), on the other hand, is a band insulator with a gap of 2.2 eV. Systems with fractional doping are metals if no charge orderings are present. Due to the strong interaction between the doped electron and other correlated Co d electrons, the calculated electronic structure of (CoO2)(x-) depends sensitively on the doping level x. Zone center optical phonon energies are calculated under the frozen phonon approximation and are in good agreement with measured values. Softening of the E-g phonon at doping xsimilar to0.25 seems to indicate a strong electron-phonon coupling in this system. Possible intermediate spin states of Co ions, Na ordering, as well as magnetic and charge orderings in this system are also discussed. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA. RP Zhang, PH (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Zhang, Peihong/D-2787-2012; Luo, Weidong/A-8418-2009 OI Luo, Weidong/0000-0003-3829-1547 NR 45 TC 66 Z9 68 U1 1 U2 10 PU AMERICAN 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 AUG PY 2004 VL 70 IS 8 AR 085108 DI 10.1103/PhysRevB.70.085108 PG 13 WC Physics, Condensed Matter SC Physics GA 851WH UT WOS:000223716700030 ER PT J AU Abu Saleem, K Janssens, RVF Carpenter, MP Kondev, FG Wiedenhover, I Ahmad, I Caggiano, J Chowdhury, P Cizewski, JA Cline, D Devlin, M Fotiades, N Greene, JP Hackman, G Heinz, A Khoo, TL Lauritsen, T Lister, CJ Macchiavelli, AO Seabury, EH Seweryniak, D Sonzogni, A Wu, CY AF Abu Saleem, K Janssens, RVF Carpenter, MP Kondev, FG Wiedenhover, I Ahmad, I Caggiano, J Chowdhury, P Cizewski, JA Cline, D Devlin, M Fotiades, N Greene, JP Hackman, G Heinz, A Khoo, TL Lauritsen, T Lister, CJ Macchiavelli, AO Seabury, EH Seweryniak, D Sonzogni, A Wu, CY TI Alignments in the odd-proton actinides Np-237 and Am-241 SO PHYSICAL REVIEW C LA English DT Article ID IN-BEAM; SUPERDEFORMED STATES; EXCITATION-ENERGIES; COULOMB-EXCITATION; ROTATIONAL BANDS; HG-190; NUCLEI; NO-254; DEFORMATION; VIBRATION AB High spin states in Np-237 and Am-241 have been studied with the "unsafe" Coulomb excitation technique. In each nucleus, signature partner rotational bands built on the [523]5/2(-) and [642]5/2(+) orbitals of respective h(9/2) and i(13/2) parentage have been delineated. An additional pair of bands based on the [521]3/2(-) (f(7/2)) state was also observed in Am-241. New information on the even-even Pu-236 and Cm-242 transfer products is also presented. From the present data, the role of i(13/2) protons in generating angular momentum in the even-even nuclei of the region is documented. A satisfactory description of the evolution of the rotational sequences with spin is achieved within the framework of the cranked shell model. Nevertheless, when combined with information on odd-neutron nuclei available from elsewhere, the data highlight significant shortcomings of the available theoretical predictions. C1 Argonne Natl Lab, Argonne, IL 60439 USA. IIT, Dept Phys, Chicago, IL 60616 USA. Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. Univ Massachusetts, Lowell, MA 01854 USA. Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA. Univ Rochester, Rochester, NY 14627 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Abu Saleem, K (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Devlin, Matthew/B-5089-2013; Heinz, Andreas/E-3191-2014; Carpenter, Michael/E-4287-2015 OI Devlin, Matthew/0000-0002-6948-2154; Carpenter, Michael/0000-0002-3237-5734 NR 38 TC 17 Z9 17 U1 1 U2 3 PU AMERICAN 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 AUG PY 2004 VL 70 IS 2 AR 024310 DI 10.1103/PhysRevC.70.024310 PG 15 WC Physics, Nuclear SC Physics GA 851WT UT WOS:000223717900020 ER PT J AU Armstrong, TA Barish, KN Batsouli, S Bennett, SJ Bertaina, M Chikanian, A Coe, SD Cormier, TM Davies, R Dover, CB Fachini, P Fadem, B Finch, LE George, NK Greene, SV Haridas, P Hill, JC Hirsch, AS Hoversten, R Huang, HZ Jaradat, H Kumar, BS Lainis, T Lajoie, JG Lewis, RA Li, Q Libby, B Majka, RD Miller, TE Munhoz, MG Nagle, JL Pless, IA Pope, JK Porile, NT Pruneau, CA Rabin, MSZ Reid, JD Rimai, A Rose, A Rotondo, FS Sandweiss, J Scharenberg, RP Slaughter, AJ Smith, GA Tincknell, XML Toothacker, WS Van Buren, G Wohn, FK Xu, Z AF Armstrong, TA Barish, KN Batsouli, S Bennett, SJ Bertaina, M Chikanian, A Coe, SD Cormier, TM Davies, R Dover, CB Fachini, P Fadem, B Finch, LE George, NK Greene, SV Haridas, P Hill, JC Hirsch, AS Hoversten, R Huang, HZ Jaradat, H Kumar, BS Lainis, T Lajoie, JG Lewis, RA Li, Q Libby, B Majka, RD Miller, TE Munhoz, MG Nagle, JL Pless, IA Pope, JK Porile, NT Pruneau, CA Rabin, MSZ Reid, JD Rimai, A Rose, A Rotondo, FS Sandweiss, J Scharenberg, RP Slaughter, AJ Smith, GA Tincknell, XML Toothacker, WS Van Buren, G Wohn, FK Xu, Z TI Production of H-3(Lambda) and H-4(Lambda) in central 11.5 GeV/c Au plus Pt heavy ion collisions SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; STRANGE QUARK MATTER; AU+AU COLLISIONS; LAMBDA-HYPERNUCLEI; AGS ENERGY; DECAY; HYPERTRITON; EXPANSION; OBJECTS; SEARCH AB We present measurements from BNL AGS Experiment 864 of the H-3(Lambda) yield and of an upper limit on the H-4(Lambda) yield in central 11.5A GeV/c Au+Pt collisions. The measurements span a rapidity range from center of mass, y(c.m.), to y(c.m.)+1 and a transverse momentum range of 0e+nu and W-->mu+nu decay channels. We fit the W boson transverse mass distribution to a set of templates from a Monte Carlo event generator and detector simulation in several ranges of the W transverse momentum. The measurement agrees with the standard model expectation, whereby the ratio of longitudinally to transversely polarized W bosons, in the Collins-Soper W rest frame, increases with the W transverse momentum at a rate of approximately 15% per 10 GeV/c. C1 Univ Florida, Gainesville, FL 32611 USA. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02254 USA. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Nucl Res Inst, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Seoul Natl Univ, Seoul 151742, South Korea. Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. UCL, London WC1E 6BT, England. MIT, Cambridge, MA 02139 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Inst Theoret & Expt Phys, Moscow 117259, Russia. Univ New Mexico, Albuquerque, NM 87131 USA. Northwestern Univ, Evanston, IL 60208 USA. Ohio State Univ, Columbus, OH 43210 USA. Osaka City Univ, Osaka 588, Japan. Univ Oxford, Oxford OX1 3RH, England. Univ Padua, Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Scuola Normale Super Pisa, I-56100 Pisa, Italy. Univ Pittsburgh, Pittsburgh, PA 15260 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Rockefeller Univ, New York, NY 10021 USA. Univ Roma 1, Inst Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy. Rutgers State Univ, Piscataway, NJ 08855 USA. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Toronto, Inst Particle Phys, Toronto, ON M5S 1A7, Canada. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. Tufts Univ, Medford, MA 02155 USA. Waseda Univ, Tokyo 169, Japan. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. CCLRC Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. RP Univ Florida, Gainesville, FL 32611 USA. RI Lancaster, Mark/C-1693-2008; Ruiz, Alberto/E-4473-2011; Cabrera Urban, Susana/H-1376-2015; De Cecco, Sandro/B-1016-2012; Wolter, Marcin/A-7412-2012; Azzi, Patrizia/H-5404-2012; manca, giulia/I-9264-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Ivanov, Andrew/A-7982-2013; Kim, Soo-Bong/B-7061-2014; Scodellaro, Luca/K-9091-2014; Paulini, Manfred/N-7794-2014; vilar, rocio/P-8480-2014; Prokoshin, Fedor/E-2795-2012; Introzzi, Gianluca/K-2497-2015; Gorelov, Igor/J-9010-2015; Leonardo, Nuno/M-6940-2016 OI Ruiz, Alberto/0000-0002-3639-0368; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Ivanov, Andrew/0000-0002-9270-5643; Scodellaro, Luca/0000-0002-4974-8330; Paulini, Manfred/0000-0002-6714-5787; Prokoshin, Fedor/0000-0001-6389-5399; Introzzi, Gianluca/0000-0002-1314-2580; Gorelov, Igor/0000-0001-5570-0133; Leonardo, Nuno/0000-0002-9746-4594 NR 32 TC 4 Z9 4 U1 1 U2 3 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 AUG PY 2004 VL 70 IS 3 AR 032004 DI 10.1103/PhysRevD.70.032004 PG 21 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600010 ER PT J AU Adler, S Aoki, M Ardebili, M Atiya, MS Bazarko, AO Bergbusch, PC Bhuyan, B Blackmore, EW Bryman, DA Chiang, IH Convery, MR Diwan, MV Frank, JS Haggerty, JS Inagaki, T Ito, MM Jain, V Jaffe, DE Kabe, S Kazumori, M Kettell, SH Kitching, P Kobayashi, M Komatsubara, TK Konaka, A Kuno, Y Kuriki, M Kycia, TF Li, KK Littenberg, LS Macdonald, JA McPherson, RA Meyers, PD Mildenberger, J Muramatsu, N Nakano, T Ng, C Ng, S Numao, T Otomo, A Poutissou, JM Poutissou, R Redlinger, G Sasaki, T Sato, T Shinkawa, T Shoemaker, FC Smith, AJS Soluk, R Stone, JR Strand, RC Sugimoto, S Witzig, C Yoshimura, Y AF Adler, S Aoki, M Ardebili, M Atiya, MS Bazarko, AO Bergbusch, PC Bhuyan, B Blackmore, EW Bryman, DA Chiang, IH Convery, MR Diwan, MV Frank, JS Haggerty, JS Inagaki, T Ito, MM Jain, V Jaffe, DE Kabe, S Kazumori, M Kettell, SH Kitching, P Kobayashi, M Komatsubara, TK Konaka, A Kuno, Y Kuriki, M Kycia, TF Li, KK Littenberg, LS Macdonald, JA McPherson, RA Meyers, PD Mildenberger, J Muramatsu, N Nakano, T Ng, C Ng, S Numao, T Otomo, A Poutissou, JM Poutissou, R Redlinger, G Sasaki, T Sato, T Shinkawa, T Shoemaker, FC Smith, AJS Soluk, R Stone, JR Strand, RC Sugimoto, S Witzig, C Yoshimura, Y CA E787 Collaboration TI Further search for the decay K+->pi(+)nu(nu)over-bar in the momentum region P < 195 MeV/c SO PHYSICAL REVIEW D LA English DT Article ID ENDCAP PHOTON DETECTOR; 500 MHZ; PERFORMANCE AB We report the results of a search for the decay K+-->pi(+)nu(ν) over bar in the kinematic region with pi(+) momentum 140pi(+)nu(ν) over bar. We also report improved limits on the rates of K+-->pi(+)X(0) and K+-->pi(+)X(1)X(2) where X-0,X-1,X-2 are hypothetical, massless, long-lived neutral particles. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. TRIUMF, Vancouver, BC V6T 2A3, Canada. Princeton Univ, Joseph Henry Labs, Princeton, NJ 08544 USA. Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada. KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan. Univ Alberta, Ctr Subatom Res, Edmonton, AB T6G 2N5, Canada. Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan. Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India. SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA. RP Adler, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 19 TC 40 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 037102 DI 10.1103/PhysRevD.70.037102 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600097 ER PT J AU Albright, CH Barr, SM AF Albright, CH Barr, SM TI Resonant leptogenesis in a predictive SO(10) grand unified model SO PHYSICAL REVIEW D LA English DT Article ID HEAVY MAJORANA NEUTRINOS; SYMMETRIC TEXTURE; FERMION MASSES; CP VIOLATION; BARYOGENESIS; OSCILLATIONS; UNIFICATION; DECAYS; BARYON; ANGLES AB An SO(10) grand unified model considered previously by the authors featuring lopsided down quark and charged lepton mass matrices is successfully predictive and requires that the lightest two right-handed Majorana neutrinos be nearly degenerate in order to obtain the LMA solar neutrino solution. Here we use this model to test its predictions for baryogenesis through resonant-enhanced leptogenesis. With the conventional type I seesaw mechanism, the best predictions for baryogenesis appear to fall a factor of three short of the observed value. However, with a proposed type III seesaw mechanism leading to three pairs of massive pseudo-Dirac neutrinos, resonant leptogenesis is decoupled from the neutrino mass and mixing issues with successful baryogenesis easily obtained. C1 No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA. RP No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. EM albright@fnal.gov; smbarr@bartol.udel.edu OI Albright, Carl/0000-0002-2252-6359 NR 48 TC 39 Z9 39 U1 1 U2 1 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 AUG PY 2004 VL 70 IS 3 AR 033013 DI 10.1103/PhysRevD.70.033013 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600025 ER PT J AU Alexander, S Malecki, J Smolin, L AF Alexander, S Malecki, J Smolin, L TI Quantum gravity and inflation SO PHYSICAL REVIEW D LA English DT Article ID UNIVERSE; COSMOLOGY AB Using the Ashtekar-Sen variables of loop quantum gravity, a new class of exact solutions to the equations of quantum cosmology is found for gravity coupled to a scalar field that corresponds to inflating universes. The scalar field, which has an arbitrary potential, is treated as a time variable, reducing the Hamiltonian constraint to a time-dependent Schrodinger equation. When reduced to the homogeneous and isotropic case, this is solved exactly by a set of solutions that extend the Kodama state, taking into account the time dependence of the vacuum energy. Each quantum state corresponds to a classical solution of the Hamiltonian-Jacobi equation. The study of the latter shows evidence for an attractor, suggesting a universality in the phenomena of inflation. Finally, wave packets can be constructed by superposing solutions with different ratios of kinetic to potential scalar field energy, resolving, at least in this case, the issue of normalizability of the Kodama state. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, ITP, Stanford, CA 94309 USA. Perimeter Inst Theoret Phys, Waterloo, ON, Canada. Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada. RP Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 33 TC 11 Z9 11 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 AUG PY 2004 VL 70 IS 4 AR 044025 DI 10.1103/PhysRevD.70.044025 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WK UT WOS:000223859700089 ER PT J AU Ananthanarayan, B Rindani, SD AF Ananthanarayan, B Rindani, SD TI CP violation at a linear collider with transverse polarization SO PHYSICAL REVIEW D LA English DT Article ID ELECTRON-POSITRON ANNIHILATION; WEAK DIPOLE-MOMENT; E+E COLLISIONS; TAU-LEPTONS; TOP-QUARK; ASYMMETRIES; COUPLINGS; CURRENTS; TESTS AB We show how transverse beam polarization at e(+)e(-) colliders can provide a novel means to search for CP violation by observing the distribution of a single final-state particle without measuring its spin. We suggest an azimuthal asymmetry which singles out interference terms between standard model contribution and new-physics scalar or tensor effective interactions in the limit in which the electron mass is neglected. Such terms are inaccessible with unpolarized or longitudinally polarized beams. The asymmetry is sensitive to CP violation when the transverse polarizations of the electron and positron are in opposite senses. The sensitivity of planned future linear colliders to new-physics CP violation in e(+)e(-)-->t (t) over bar is estimated in a model-independent parametrization. It would be possible to put a bound of similar to7 TeV on the new-physics scale Lambda at the 90% C.L. for roots=500 GeV and integraldtL=500 fb(-1), with transverse polarizations of 80% and 60% for the electron and positron beams, respectively. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Indian Inst Sci, Ctr High Energy Phys, Bangalore 560012, Karnataka, India. Phys Res Lab, Theory Grp, Ahmedabad 380009, Gujarat, India. RP Ananthanarayan, B (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 30 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 036005 DI 10.1103/PhysRevD.70.036005 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600091 ER PT J AU Aubert, B Barate, R Boutigny, D Couderc, F Gaillard, JM Hicheur, A Karyotakis, Y Lees, JP Tisserand, V Zghiche, A Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G LeClerc, C Lynch, G Merchant, AM Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Shelkov, VG Wenzel, WA Ford, K Harrison, TJ Hawkes, CM Morgan, SE Watson, AT Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Cuhadar-Donszelmann, T Hearty, C Knecht, NS Mattison, TS McKenna, JA Thiessen, D Khan, A Kyberd, P Teodorescu, L Blinov, VE Bukin, AD Druzhinin, VP Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Eschrich, I Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Gary, JW Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Dahmes, B Levy, SL Long, O Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Eisner, AM Heusch, CA Lockman, WS Schalk, T Schmitz, RE Schumm, BA Seiden, A Spradlin, P Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Abe, T Blanc, F Bloom, P Chen, S Derrington, IM Ford, WT Lee, CL Nauenberg, U Olivas, A Rankin, P Smith, JG Ulmer, KA van Hoek, WC Zhang, J Zhang, L Chen, A Harton, JL Soffer, A Toki, WH Wilson, RJ Zeng, QL Altenburg, D Brandt, T Brose, J Colberg, T Dickopp, M Feltresi, E Hauke, A Lacker, HM Maly, E Muller-Pfefferkorn, R Nogowski, R Otto, S Petzold, A Schubert, J Schubert, KR Schwierz, R Spaan, B Sundermann, JE Bernard, D Bonneaud, GR Brochard, F Grenier, P Schrenk, S Thiebaux, C Vasileiadis, G Verderi, M Bard, DJ Clark, PJ Lavin, D Muheim, F Playfer, S Xie, Y Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Sarti, A Treadwell, E Baldini-Ferroli, R Calcaterra, A de Sangro, R Finocchiaro, G Patteri, P Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Brandenburg, G Morii, M Won, E Dubitzky, RS Langenegger, U Bhimji, W Bowerman, DA Dauncey, PD Egede, U Gaillard, JR Morton, GW Nash, JA Taylor, GP Grenier, GJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Yi, J Davier, M Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Coleman, JP Fry, JR Gabathuler, E Gamet, R Parry, RJ Payne, DJ Sloane, RJ Touramanis, C Back, JJ Cormack, CM Harrison, PF Mohanty, GB Brown, CL Cowan, G Flack, RL Flaecher, HU Green, MG Marker, CE McMahon, TR Ricciardi, S Salvatore, F Vaitsas, G Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hart, PA Hodgkinson, MC Lafferty, GD Lyon, AJ Williams, JC Farbin, A Hulsbergen, WD Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote, D Taras, P Nicholson, H Cavallo, N Fabozzi, F Gatto, C Lista, L Monorchio, D Paolucci, P Piccolo, D Sciacca, C Baak, M Bulten, H Raven, G Wilden, L Jessop, CP LoSecco, JM Gabriel, TA Allmendinger, T Brau, B Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Rahimi, AM Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Anulli, F Peruzzi, IM Biasini, M Pioppi, M Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Del Gamba, V Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lu, C Miftakov, V Olsen, J Smith, AJS Telnov, AV Bellini, F Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Li Gioi, L Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Cavoto, G Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Langer, M Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Yumiceva, FX Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Borean, C Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Band, HR Dasu, S Datta, M Eichenbaum, AM Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Di Lodovico, F Mihalyi, A Mohapatra, AK Pan, Y Prepost, R Rubin, AE Sekula, SJ Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Neal, H AF Aubert, B Barate, R Boutigny, D Couderc, F Gaillard, JM Hicheur, A Karyotakis, Y Lees, JP Tisserand, V Zghiche, A Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G LeClerc, C Lynch, G Merchant, AM Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Shelkov, VG Wenzel, WA Ford, K Harrison, TJ Hawkes, CM Morgan, SE Watson, AT Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Cuhadar-Donszelmann, T Hearty, C Knecht, NS Mattison, TS McKenna, JA Thiessen, D Khan, A Kyberd, P Teodorescu, L Blinov, VE Bukin, AD Druzhinin, VP Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Eschrich, I Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Gary, JW Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Dahmes, B Levy, SL Long, O Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Eisner, AM Heusch, CA Lockman, WS Schalk, T Schmitz, RE Schumm, BA Seiden, A Spradlin, P Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Abe, T Blanc, F Bloom, P Chen, S Derrington, IM Ford, WT Lee, CL Nauenberg, U Olivas, A Rankin, P Smith, JG Ulmer, KA van Hoek, WC Zhang, J Zhang, L Chen, A Harton, JL Soffer, A Toki, WH Wilson, RJ Zeng, QL Altenburg, D Brandt, T Brose, J Colberg, T Dickopp, M Feltresi, E Hauke, A Lacker, HM Maly, E Muller-Pfefferkorn, R Nogowski, R Otto, S Petzold, A Schubert, J Schubert, KR Schwierz, R Spaan, B Sundermann, JE Bernard, D Bonneaud, GR Brochard, F Grenier, P Schrenk, S Thiebaux, C Vasileiadis, G Verderi, M Bard, DJ Clark, PJ Lavin, D Muheim, F Playfer, S Xie, Y Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Sarti, A Treadwell, E Baldini-Ferroli, R Calcaterra, A de Sangro, R Finocchiaro, G Patteri, P Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Brandenburg, G Morii, M Won, E Dubitzky, RS Langenegger, U Bhimji, W Bowerman, DA Dauncey, PD Egede, U Gaillard, JR Morton, GW Nash, JA Taylor, GP Grenier, GJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Yi, J Davier, M Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Coleman, JP Fry, JR Gabathuler, E Gamet, R Parry, RJ Payne, DJ Sloane, RJ Touramanis, C Back, JJ Cormack, CM Harrison, PF Mohanty, GB Brown, CL Cowan, G Flack, RL Flaecher, HU Green, MG Marker, CE McMahon, TR Ricciardi, S Salvatore, F Vaitsas, G Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hart, PA Hodgkinson, MC Lafferty, GD Lyon, AJ Williams, JC Farbin, A Hulsbergen, WD Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote, D Taras, P Nicholson, H Cavallo, N Fabozzi, F Gatto, C Lista, L Monorchio, D Paolucci, P Piccolo, D Sciacca, C Baak, M Bulten, H Raven, G Wilden, L Jessop, CP LoSecco, JM Gabriel, TA Allmendinger, T Brau, B Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Rahimi, AM Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Anulli, F Peruzzi, IM Biasini, M Pioppi, M Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Del Gamba, V Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lu, C Miftakov, V Olsen, J Smith, AJS Telnov, AV Bellini, F Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Li Gioi, L Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Cavoto, G Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Langer, M Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Yumiceva, FX Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Borean, C Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Band, HR Dasu, S Datta, M Eichenbaum, AM Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Di Lodovico, F Mihalyi, A Mohapatra, AK Pan, Y Prepost, R Rubin, AE Sekula, SJ Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Neal, H CA BABAR Collaboration TI B meson decays to eta K-(')*, eta(('))rho, eta(('))pi(0), omega pi(0), and phi pi(0) SO PHYSICAL REVIEW D LA English DT Article ID CP-VIOLATION; ETA; SEARCH; VECTOR; MODES AB We present measurements of the branching fractions and charge asymmetries (where appropriate) of two-body B decays to eta(('))K(*), eta(('))rho, eta(('))pi(0), omegapi(0), and phipi(0). The data were recorded with the BABAR detector at PEP-II and correspond to 89x10(6) B (B) over bar pairs produced in e(+)e(-) annihilation through the Y(4S) resonance. We find significant signals for two decay modes and measure the branching fractions B(B+-->etaK(*+))=(25.6+/-4.0+/-2.4)x10(-6) and B(B-0-->etaK(*0))=(18.6+/-2.3+/-1.2)x10(-6), where the first error is statistical and the second systematic. We also find evidence with significance 3.5sigma for a third decay mode and measure B(B+-->etarho(+))=(9.2+/-3.4+/-1.0)x10(-6). For other channels, we set 90% C.L. upper limits of B(B-0-->etarho(0))<1.5x10(-6), B(B+-->eta(')K(*+))<14x10(-6), B(B-0-->eta(')K(*0))<7.6x10(-6), B(B+-->eta(')rho(+))<22x10(-6), B(B-0-->eta(')rho(0))<4.3x10(-6), B(B-0-->etapi(0))<2.5x10(-6), B(B-0-->eta(')pi(0))<3.7x10(-6), B(B-0-->omegapi(0))<1.2x10(-6), and B(B-0-->phipi(0))<1.0x10(-6). For self-flavor-tagging modes with significant signals, the time-integrated charge asymmetries are A(ch)(etaK(*+))=+0.13+/-0.14+/-0.02 and A(ch)(etaK(*0))=+0.02+/-0.11+/-0.02. C1 Phys Particules Lab, F-74941 Annecy Le Vieux, France. Univ Bari, Dipartmento Fis, I-70126 Bari, Italy. Ist Nazl Fis Nucl, I-70126 Bari, Italy. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Bergen, Inst Phys, N-5007 Bergen, Norway. Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Ruhr Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany. Univ Bristol, Bristol BS8 1TL, Avon, England. Univ British Columbia, Vancouver, BC V6T 1Z1, Canada. Brunel Univ, Uxbridge UB8 3PH, Middx, England. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA. CALTECH, Pasadena, CA 91125 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. Univ Colorado, Boulder, CO 80309 USA. Colorado State Univ, Ft Collins, CO 80523 USA. Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany. Ecole Polytech, LLR, F-91128 Palaiseau, France. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. Florida A&M Univ, Tallahassee, FL 32307 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy. Ist Nazl Fis Nucl, I-16146 Genoa, Italy. Harvard Univ, Cambridge, MA 02138 USA. Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany. Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England. Univ Iowa, Iowa City, IA 52242 USA. Iowa State Univ, Ames, IA 50011 USA. Lab Accelerateur Lineaire, F-91898 Orsay, France. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Liverpool, Liverpool L69 72E, Merseyside, England. Univ London, Queen Mary, London E1 4NS, England. Univ London, Royal Holloway & Bedford New Coll, Egham TW20 0EX, Surrey, England. Univ Louisville, Louisville, KY 40292 USA. Univ Manchester, Manchester M13 9PL, Lancs, England. Univ Maryland, College Pk, MD 20742 USA. Univ Massachusetts, Amherst, MA 01003 USA. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. McGill Univ, Montreal, PQ H3A 2T8, Canada. Univ Milan, Dipartimento Fis, I-20133 Milan, Italy. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Univ Mississippi, University, MS 38677 USA. Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada. Mt Holyoke Coll, S Hadley, MA 01075 USA. Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy. Ist Nazl Fis Nucl, I-80126 Naples, Italy. NIKHEF, Natl Inst Nucl & High Energy Phys, NL-1009 DB Amsterdam, Netherlands. Univ Notre Dame, Notre Dame, IN 46556 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oregon, Eugene, OR 97403 USA. Univ Padua, Dipartimento Fis, I-35131 Padua, Italy. Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Paris 06, Lab Phys Nucl HE, F-75252 Paris, France. Univ Paris 07, Lab Phys Nucl HE, F-75252 Paris, France. Univ Pavia, Dipartimento Elettron, I-27100 Pavia, Italy. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Univ Penn, Philadelphia, PA 19104 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy. Ist Nazl Fis Nucl, I-06100 Perugia, Italy. Univ Pisa, Scuola Normale Super Pisa, Dipartimento Fis, I-56127 Pisa, Italy. Ist Nazl Fis Nucl, I-56127 Pisa, Italy. Prairie View A&M Univ, Prairie View, TX 77446 USA. Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, I-00185 Rome, Italy. Princeton Univ, Princeton, NJ 08544 USA. Univ Rostock, D-18051 Rostock, Germany. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CEA Saclay, DSM, DAPNIA, F-91191 Gif Sur Yvette, France. Univ S Carolina, Columbia, SC 29208 USA. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, Stanford, CA 94305 USA. SUNY Albany, Albany, NY 12222 USA. Univ Tennessee, Knoxville, TN 37996 USA. Univ Texas, Austin, TX 78712 USA. Univ Texas, Richardson, TX 75083 USA. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy. Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Vanderbilt Univ, Nashville, TN 37235 USA. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06511 USA. Univ Basilicata, I-85100 Potenza, Italy. Univ Valencia, CSIC, Inst Fis Corpuscular, IFIC, Valencia, Spain. RP Phys Particules Lab, F-74941 Annecy Le Vieux, France. RI Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Kravchenko, Evgeniy/F-5457-2015; Calabrese, Roberto/G-4405-2015; Mir, Lluisa-Maria/G-7212-2015; Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere, Maurizio/J-5049-2012; Grancagnolo, Sergio/J-3957-2015; de Groot, Nicolo/A-2675-2009; Lista, Luca/C-5719-2008; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Neri, Nicola/G-3991-2012; Forti, Francesco/H-3035-2011; Rotondo, Marcello/I-6043-2012; Patrignani, Claudia/C-5223-2009; de Sangro, Riccardo/J-2901-2012; Sarti, Alessio/I-2833-2012; Cavallo, Nicola/F-8913-2012; Della Ricca, Giuseppe/B-6826-2013; M, Saleem/B-9137-2013; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; Lusiani, Alberto/A-3329-2016; Lusiani, Alberto/N-2976-2015; Saeed, Mohammad Alam/J-7455-2012; Negrini, Matteo/C-8906-2014; Morandin, Mauro/A-3308-2016; Di Lodovico, Francesca/L-9109-2016 OI Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Mir, Lluisa-Maria/0000-0002-4276-715X; Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky, Yury/0000-0001-8496-9975; Lo Vetere, Maurizio/0000-0002-6520-4480; Grancagnolo, Sergio/0000-0001-8490-8304; Bellini, Fabio/0000-0002-2936-660X; Neri, Nicola/0000-0002-6106-3756; Forti, Francesco/0000-0001-6535-7965; Rotondo, Marcello/0000-0001-5704-6163; Patrignani, Claudia/0000-0002-5882-1747; de Sangro, Riccardo/0000-0002-3808-5455; Sarti, Alessio/0000-0001-5419-7951; Della Ricca, Giuseppe/0000-0003-2831-6982; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; Lusiani, Alberto/0000-0002-6876-3288; Lusiani, Alberto/0000-0002-6876-3288; Saeed, Mohammad Alam/0000-0002-3529-9255; Negrini, Matteo/0000-0003-0101-6963; Morandin, Mauro/0000-0003-4708-4240; Di Lodovico, Francesca/0000-0003-3952-2175 NR 30 TC 181 Z9 184 U1 0 U2 9 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 AUG PY 2004 VL 70 IS 3 AR 032006 DI 10.1103/PhysRevD.70.032006 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600012 ER PT J AU Bar, O Rupak, G Shoresh, N AF Bar, O Rupak, G Shoresh, N TI Chiral perturbation theory at O(a(2)) for lattice QCD SO PHYSICAL REVIEW D LA English DT Article ID STRONG-COUPLING EXPANSION; EXACTLY MASSLESS QUARKS; WILSON FERMIONS; CONTINUUM-LIMIT; GAUGE-THEORIES; PHASE-STRUCTURE; SYMMETRY AB We construct chiral effective Lagrangian for two lattice theories: one with Wilson fermions and the other with Wilson sea fermions and Ginsparg-Wilson valence fermions. For each of these theories we construct the Symanzik action through O(a(2)). The chiral Lagrangian is then derived, including terms of O(a(2)), which have not been calculated before. We find that there are only few new terms at this order. Corrections to existing coefficients in the continuum chiral Lagrangian are proportional to a(2) and appear in the Lagrangian at O(a(2)p(2)) or higher. Similarly, O(4) symmetry-breaking terms enter the Symanzik action at O(a(2)), but contribute to the chiral Lagrangian at O(a(2)p(4)) or higher. We calculate the light meson masses in chiral perturbation theory for both lattice theories. At next-to-leading order, we find that there are no O(a(2)) corrections to the valence-valence meson mass in the mixed theory due to the enhanced chiral symmetry of the valence sector. C1 Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Boston Univ, Dept Phys, Boston, MA 02215 USA. RP Bar, O (reprint author), Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan. EM obaer@het.ph.tsukuba.ac.jp; grupak@lbl.gov; shoresh@bu.edu NR 42 TC 94 Z9 95 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 034508 DI 10.1103/PhysRevD.70.034508 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600068 ER PT J AU Beane, SR AF Beane, SR TI Nucleon masses and magnetic moments in a finite volume SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL PERTURBATION-THEORY; PARTIALLY QUENCHED QCD; BARYON MASSES; LATTICE; LOGARITHMS; OCTET AB We compute finite-size corrections to nucleon masses and magnetic moments in a periodic, spatial box of size L, both in QCD and in partially quenched QCD. C1 Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. Jefferson Lab, Newport News, VA 23606 USA. RP Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. NR 53 TC 56 Z9 57 U1 0 U2 1 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 AUG PY 2004 VL 70 IS 3 AR 034507 DI 10.1103/PhysRevD.70.034507 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600067 ER PT J AU Carroll, SM Duvvuri, V Trodden, M Turner, MS AF Carroll, SM Duvvuri, V Trodden, M Turner, MS TI Is cosmic speed-up due to new gravitational physics? SO PHYSICAL REVIEW D LA English DT Article ID PROBE WMAP OBSERVATIONS; ANGULAR POWER SPECTRUM; HIGHER-ORDER GRAVITY; COSMOLOGICAL CONSEQUENCES; SCALAR FIELD; SUPERNOVAE; INFLATION; UNIVERSE; MODELS; LAMBDA AB We show that cosmic acceleration can arise due to very tiny corrections to the usual gravitational action of general relativity, of the form R-n with n>0. This model eliminates the need for a nonzero cosmological constant or any other form of dark energy, attributing a purely gravitational origin to the acceleration of the universe. C1 Univ Chicago, Enrico Fermi Inst, Dept Phys, Chicago, IL 60637 USA. Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA. Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. Fermilab Natl Accelerator Lab, NASA, Fermilab Astrophys Ctr, Batavia, IL 60510 USA. Univ Chicago, Ctr Cosmol Phys, Chicago, IL 60637 USA. RP Univ Chicago, Enrico Fermi Inst, Dept Phys, 5640 S Ellis Ave, Chicago, IL 60637 USA. OI Trodden, Mark/0000-0001-6864-6711 NR 31 TC 1203 Z9 1207 U1 8 U2 41 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 AUG PY 2004 VL 70 IS 4 AR 043528 DI 10.1103/PhysRevD.70.043528 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WK UT WOS:000223859700049 ER PT J AU Chen, Y Dong, SJ Draper, T Horvath, I Lee, FX Liu, KF Mathur, N Zhang, JB AF Chen, Y Dong, SJ Draper, T Horvath, I Lee, FX Liu, KF Mathur, N Zhang, JB TI Chiral logarithms in quenched QCD SO PHYSICAL REVIEW D LA English DT Article ID OVERLAP DIRAC OPERATOR; PERTURBATION-THEORY; LATTICE QCD; GAUGE-THEORIES; HADRON MASSES; NUMERICAL-METHODS; FERMIONS; SYMMETRY; SPECTROSCOPY; SPECTRUM AB The quenched chiral logarithms are examined on a 16(3)x28 lattice with Iwasaki gauge action and overlap fermions. The pion decay constant f(pi) is used to set the lattice spacing, a=0.200(3) fm. With pion mass as low as similar to180 MeV, we see the quenched chiral logarithms clearly in m(pi)(2)/m and f(P), the pseudoscalar decay constant. We analyze the data to determine how low the pion mass needs to be in order for the quenched one-loop chiral perturbation theory (chiPT) to apply. With the constrained curve-fitting method, we are able to extract the quenched chiral logarithmic parameter delta together with other low-energy parameters. Only for m(pi)less than or equal to300 MeV do we obtain a consistent and stable fit with a constant delta which we determine to be 0.24(3)(4) (at the chiral scale Lambda(chi)=0.8 GeV). By comparing to the 12(3)x28 lattice, we estimate the finite volume effect to be about 2.7% for the smallest pion mass. We also fitted the pion mass to the form for the re-summed cactus diagrams and found that its applicable region is extended farther than the range for the one-loop formula, perhaps up to m(pi)similar to500-600 MeV. The scale independent delta is determined to be 0.20(3) in this case. We study the quenched non-analytic terms in the nucleon mass and find that the coefficient C-1/2 in the nucleon mass is consistent with the prediction of one-loop chiPT. We also obtain the low energy constant L-5 from f(pi). We conclude from this study that it is imperative to cover only the range of data with the pion mass less than similar to300 MeV in order to examine the chiral behavior of the hadron masses and decay constants in quenched QCD and match them with quenched one-loop chiPT. C1 Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA. Inst High Energy Phys, Beijing 100039, Peoples R China. George Washington Univ, Dept Phys, Ctr Nucl Studies, Washington, DC 20052 USA. Jefferson Lab, Newport News, VA 23606 USA. Univ Adelaide, CSSM, Adelaide, SA 5005, Australia. Univ Adelaide, Dept Phys & Math Phys, Adelaide, SA 5005, Australia. RP Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA. NR 59 TC 26 Z9 26 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 AUG PY 2004 VL 70 IS 3 AR 034502 DI 10.1103/PhysRevD.70.034502 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600062 ER PT J AU Dine, M Fox, PJ Gorbatov, E Shadmi, Y Shirman, Y Thomas, S AF Dine, M Fox, PJ Gorbatov, E Shadmi, Y Shirman, Y Thomas, S TI Visible effects of the hidden sector SO PHYSICAL REVIEW D LA English DT Article ID YANG-MILLS THEORIES; SUPERSYMMETRY-BREAKING AB The renormalization of operators responsible for soft supersymmetry breaking is usually calculated by starting at some high scale and including only visible sector interactions in the evolution equations, while ignoring hidden sector interactions. Here we explain why this is correct only for the most trivial structures in the hidden sector and discuss possible implications. This investigation was prompted by the idea of conformal sequestering. In that framework hidden sector renormalizations by nearly conformal dynamics are critical. In the original models of conformal sequestering it was necessary to impose hidden sector flavor symmetries to achieve the sequestered form. We present models that can evade this requirement and lead to no-scale or anomaly mediated boundary conditions, but the necessary structures do not seem generic. More generally, the ratios of scalar masses to gaugino masses, the mu term, the Bmu term, A terms, and the gravitino mass can be significantly affected. C1 Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA. Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Stanford Univ, Dept Phys, Stanford, CA 94305 USA. RP Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA. NR 13 TC 50 Z9 50 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 AUG PY 2004 VL 70 IS 4 AR 045023 DI 10.1103/PhysRevD.70.045023 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WK UT WOS:000223859700132 ER PT J AU Doi, T Ishii, N Oka, M Suganuma, H AF Doi, T Ishii, N Oka, M Suganuma, H TI Thermal effects on quark-gluon mixed condensate g <(q)over-bar sigma(mu nu)G(mu nu)q > from lattice QCD SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM CHROMODYNAMICS; SYMMETRY-BREAKING; CHIRAL-SYMMETRY; BARYON MASSES; SUM-RULE AB We present the first study of the thermal effects on the quark-gluon mixed condensate g<(q) over bar sigma(munu)G(munu)q>, which is another chiral order parameter, in the SU(3)(c) lattice QCD with the Kogut-Susskind fermion at the quenched level. Using the lattices at beta=6.0, 6.1, and 6.2 in high statistics, we calculate g<(q) over bar sigma(munu)G(munu)q> as well as <(q) over barq> in the chiral limit for 0less than or similar toTless than or similar to500 MeV. Except for the sharp decrease of both the condensates around T(c)similar or equal to280 MeV, the thermal effects are found to be weak below T-c. We also find that the ratio m(0)(2)equivalent tog<(q) over bar sigma(munu)G(munu)q>/<(q) over barq> is almost independent of the temperature even in the very vicinity of T-c. This result indicates nontrivial similarity in the chiral behaviors of the two different condensates. C1 Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan. RP Doi, T (reprint author), Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. EM doi@quark.phy.bnl.gov NR 27 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 034510 DI 10.1103/PhysRevD.70.034510 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600070 ER PT J AU Dumitru, A Hatta, Y Lenaghan, J Orginos, K Pisarski, RD AF Dumitru, A Hatta, Y Lenaghan, J Orginos, K Pisarski, RD TI Deconfining phase transition as a matrix model of renormalized Polyakov loops SO PHYSICAL REVIEW D LA English DT Review ID LATTICE GAUGE-THEORY; YANG-MILLS THEORY; REPRESENTATION WILSON LINES; FUNDAMENTAL-ADJOINT ACTION; TWO-DIMENSIONAL LATTICE; FINITE-TEMPERATURE QCD; LARGE-N LIMIT; STRING THEORY; QUANTUM CHROMODYNAMICS; CRITICAL-BEHAVIOR AB We discuss how to extract renormalized loops from bare Polyakov loops in SU(N) lattice gauge theories at nonzero temperature. Single loops in an irreducible representation are multiplicatively renormalized, without mixing, through mass renormalization. The values of renormalized loops in the four lowest representations of SU(3) were measured numerically on small, coarse lattices. We find that in magnitude, condensates for the sextet and octet loops are approximately the square of the triplet loop. This agrees with a large N expansion, where factorization implies that the expectation values of loops in adjoint and higher representations are powers of fundamental and antifundamental loops. The corrections to the large N relations at three colors are greatest for the sextet loop, similar to1/N, and are found to be less than or equal to25%. The values of the renormalized triplet loop can be described by a matrix model, with an effective action dominated by the triplet loop: the deconfining phase transition for N=3 is close to the Gross-Witten point at N=infinity. C1 Goethe Univ Frankfurt, Inst Theoret Phys, D-60054 Frankfurt, Germany. Kyoto Univ, Dept Phys, Kyoto 6068502, Japan. RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA. Brookhaven Natl Lab, Dept Phys, RIKEN BNL, Upton, NY 11973 USA. MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA. MIT, Dept Phys, Cambridge, MA 02139 USA. Niels Bohr Inst, DK-2100 Copenhagen, Denmark. RP Goethe Univ Frankfurt, Inst Theoret Phys, Postfach 11 19 32, D-60054 Frankfurt, Germany. NR 188 TC 132 Z9 132 U1 0 U2 1 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 AUG PY 2004 VL 70 IS 3 AR 034511 DI 10.1103/PhysRevD.70.034511 PG 23 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600071 ER PT J AU Jager, B Stratmann, M Vogelsang, W AF Jager, B Stratmann, M Vogelsang, W TI Single-inclusive jet production in polarized pp collisions at O(alpha(3)(s)) SO PHYSICAL REVIEW D LA English DT Article ID HADRON-HADRON SCATTERING; HARD QCD PROCESSES; CROSS-SECTION; LEADING ORDER; MASS SINGULARITIES; PARTON MODEL; FACTORIZATION; GLUONS; 3-JET; DISTRIBUTIONS AB We present a next-to-leading order QCD calculation for single-inclusive high-p(T) jet production in longitudinally polarized pp collisions within the "small-cone" approximation. The fully analytical expressions obtained for the underlying partonic hard-scattering cross sections greatly facilitate the analysis of upcoming BNL-RHIC data on the double-spin asymmetry A(LL)(jet) for this process in terms of the unknown polarization of gluons in the nucleon. We simultaneously rederive the corresponding QCD corrections to unpolarized scattering and confirm the results existing in the literature. We also numerically compare to results obtained with Monte Carlo methods and assess the range of validity of the "small-cone" approximation for the kinematics relevant at BNL-RHIC. C1 Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. RP Jager, B (reprint author), Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. NR 42 TC 84 Z9 84 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 034010 DI 10.1103/PhysRevD.70.034010 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600037 ER PT J AU Kilgore, WB AF Kilgore, WB TI Subtraction terms for hadronic production processes at next-to-next-to-leading order SO PHYSICAL REVIEW D LA English DT Article ID HIGGS-BOSON PRODUCTION; JET CROSS-SECTIONS; MULTILOOP INTEGRALS; NNLO CORRECTIONS; QCD; AMPLITUDES; FACTORIZATION; COLLISIONS; ALGORITHM AB I describe a subtraction scheme for the next-to-next-to-leading order calculation of single inclusive production at hadron colliders. Such processes include Drell-Yan, W+/-, Z and Higgs Boson production. The key to such a calculation is a treatment of initial state radiation which preserves the production characteristics, such as the rapidity distribution, of the process involved. The method builds upon the Dipole Formalism and, with proper modifications, could be applied to deep inelastic scattering and e(+)e(-) annihilation to hadrons. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Kilgore, WB (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM kilgore@bnl.gov NR 35 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 031501 DI 10.1103/PhysRevD.70.031501 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600001 ER PT J AU Linder, EV AF Linder, EV TI Strong gravitational lensing and dark energy complementarity SO PHYSICAL REVIEW D LA English DT Article ID COSMOLOGICAL PARAMETERS; DISTANT SUPERNOVAE; POWER SPECTRUM; STATISTICS; CONSTRAINTS; UNIVERSES; CONSTANT AB In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w(0) and time variation w(a). Quantities that have instead positive correlation and so a sensitivity direction largely orthogonal to, e.g., distance probes offer the hope of achieving tight constraints through complementarity. Such quantities are found in strong gravitational lensing observations of image separations and time delays. While degeneracy between cosmological parameters prevents full complementarity, strong lensing measurements to 1% accuracy can improve equation of state characterization by 15-50%. Next generation surveys should provide data on roughly 10(5) lens systems, though systematic errors will remain challenging. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA. NR 38 TC 31 Z9 31 U1 0 U2 1 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 AUG PY 2004 VL 70 IS 4 AR 043534 DI 10.1103/PhysRevD.70.043534 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WK UT WOS:000223859700055 ER PT J AU Menon, A Morrissey, DE Wagner, CEM AF Menon, A Morrissey, DE Wagner, CEM TI Electroweak baryogenesis and dark matter in a minimal extension of the MSSM SO PHYSICAL REVIEW D LA English DT Review ID SUPERSYMMETRIC STANDARD MODEL; HIGGS-BOSON MASSES; SPONTANEOUS CP VIOLATION; PHASE-TRANSITION; FINITE-TEMPERATURE; GAUGE SINGLET; RADIATIVE-CORRECTIONS; DESTABILIZING DIVERGENCES; DIMENSIONAL REDUCTION; SUPERGRAVITY THEORIES AB We examine the possibility of electroweak baryogenesis and dark matter in the nMSSM, a minimal extension of the MSSM with a singlet field. This extension avoids the usual domain wall problem of the NMSSM, and also appears as the low energy theory in models of dynamical electroweak symmetry breaking with a so-called fat-Higgs boson. We demonstrate that a strong, first order electroweak phase transition, necessary for electroweak baryogenesis, may arise in regions of parameter space where the lightest neutralino provides an acceptable dark matter candidate. We investigate the parameter space in which these two properties are fulfilled and discuss the resulting phenomenology. In particular, we show that there are always two light CP-even and one light CP-odd Higgs bosons with masses smaller than about 250 GeV. Moreover, in order to obtain a realistic relic density, the lightest neutralino mass tends to be smaller than M-Z/2, in which case the lightest Higgs boson decays predominantly into neutralinos. C1 Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. RP Menon, A (reprint author), Argonne Natl Lab, HEP Div, 9700 Cass Ave, Argonne, IL 60439 USA. NR 115 TC 170 Z9 170 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG PY 2004 VL 70 IS 3 AR 035005 DI 10.1103/PhysRevD.70.035005 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600076 ER PT J AU Nowak, MA Praszalowicz, M Sadzikowski, M Wasiluk, J AF Nowak, MA Praszalowicz, M Sadzikowski, M Wasiluk, J TI Chiral doublers of heavy-light baryons SO PHYSICAL REVIEW D LA English DT Article ID JONA-LASINIO MODEL; SKYRME MODEL; QUARK SYMMETRY; TOPOLOGICAL SOLITON; STRANGE BARYONS; RESONANCE; HADRONS; STATE; MASS; PENTAQUARK AB We discuss the consequences of the chiral doubling scenario for baryons built of heavy and light quarks. In particular, we use the soliton description for baryons, demonstrating why each heavy-light baryon should be accompanied by the opposite parity partner. Our argumentation holds both for ordinary baryons and for exotic heavy pentaquarks which are required by the symmetries of QCD to appear in parity doublets, separated by the mass shift of the chiral origin. Interpreting the recently observed by BaBaR, CLEO, and Belle Collaborations charmed mesons with assignment (0(+),1(+)) as the parity partners of known D and D-* mesons, allows us to estimate the parameters of the mesonic effective Lagrangian, and in consequence, estimate the masses of ground states and excited states of both parities. In particular, we interpret the state recently reported by the H1 experiment at HERA as a parity partner Theta(c)(0)(3099) of yet undiscovered ground-state pentaquark Theta(c)(0)(2700). C1 Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland. Brookhaven Natl Lab, Nucl Theory Grp, Upton, NY 11973 USA. RP Jagiellonian Univ, M Smoluchowski Inst Phys, Reymonta 4, PL-30059 Krakow, Poland. RI Praszalowicz, Michal/F-1912-2016 NR 60 TC 12 Z9 12 U1 0 U2 1 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 AUG PY 2004 VL 70 IS 3 AR 031503 DI 10.1103/PhysRevD.70.031503 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600003 ER PT J AU Pakvasa, S Suzuki, M AF Pakvasa, S Suzuki, M TI Broken SU(3) antidecuplet for Theta(+) and Xi(3/2) SO PHYSICAL REVIEW D LA English DT Article ID CONSTITUENT QUARK-MODEL; PENTAQUARK STATES; CURRENT-ALGEBRA; SKYRME MODEL; FIELD THEORY; BARYONS; SOLITONS; PHOTOPRODUCTION; RESONANCE; DECUPLET AB If the narrow exotic baryon resonances Theta(+)(1540) and Xi(3/2)(1862) are members of the J(P)=1/2(+) antidecuplet with N-*(1710), the octet-antidecuplet mixing is required not only by the mass spectrum but also by the decay pattern of N-*(1710). This casts doubt on the validity of the Theta(+) mass prediction by the chiral soliton model. While all pieces of the existing experimental information point to a small octet-decuplet mixing, the magnitude of mixing required by the mass spectrum is not consistent with the value needed to account for the hadronic decay rates. The discrepancy is not resolved even after the large experimental uncertainty is taken into consideration. We fail to find an alternative SU(3) assignment even with a different spin-parity assignment. When we extend the analysis to mixing with a higher SU(3) multiplet, we find one experimentally testable scenario in the case of mixing with a 27-plet. C1 Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA. NR 73 TC 14 Z9 14 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 AUG PY 2004 VL 70 IS 3 AR 036002 DI 10.1103/PhysRevD.70.036002 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 853WJ UT WOS:000223859600088 ER PT J AU Fuentes, MA Maniadis, P Kalosakas, G Rasmussen, KO Bishop, AR Kenkre, VM Gaididei, YB AF Fuentes, MA Maniadis, P Kalosakas, G Rasmussen, KO Bishop, AR Kenkre, VM Gaididei, YB TI Multipeaked polarons in soft potentials SO PHYSICAL REVIEW E LA English DT Article ID HOLSTEIN MODEL; SOLITONS; SYSTEMS; STATES AB We consider a minimal coupled charge/excitation-lattice model capturing a competition between linear polaronic self-trapping and the self-focusing effects of a soft nonlinear on-site potential. The standard single-humped polaron ceases to exist above a critical value of the coupling strength, closely related to the inflection point in the nonlinear potential. For couplings beyond this critical value, we find that successive multihumped polaronic solutions correspond to the lowest-energy stationary states of the system, which may admit interesting quantum resonance behavior. C1 Univ New Mexico, Dept Phys & Astron, Consortium Amer Interdisciplinary Sci, Albuquerque, NM 87131 USA. Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina. Univ Paris 06, CNRS, UMR 7075, LADIR, F-94320 Thiais, France. CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Bogolyubov Inst Theoret Phys, UA-252143 Kiev, Ukraine. RP Fuentes, MA (reprint author), Univ New Mexico, Dept Phys & Astron, Consortium Amer Interdisciplinary Sci, Albuquerque, NM 87131 USA. RI Rasmussen, Kim/B-5464-2009; Maniadis, Panagiotis/A-7861-2012; Kalosakas, George/L-6211-2013 OI Rasmussen, Kim/0000-0002-4029-4723; Kalosakas, George/0000-0001-7763-718X NR 28 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 1539-3755 J9 PHYS REV E JI Phys. Rev. E PD AUG PY 2004 VL 70 IS 2 AR 025601 DI 10.1103/PhysRevE.70.025601 PN 2 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 852VJ UT WOS:000223784600009 PM 15447538 ER PT J AU Hansen, SB Shlyaptseva, AS Pikuz, SA Shelkovenko, TA Sinars, DB Chandler, KM Hammer, DA AF Hansen, SB Shlyaptseva, AS Pikuz, SA Shelkovenko, TA Sinars, DB Chandler, KM Hammer, DA TI Analysis of L-shell line spectra with 50-ps time resolution from Mo X-pinch plasmas SO PHYSICAL REVIEW E LA English DT Article ID LASER-PRODUCED PLASMA; RAY-SPECTRA; SPECTROSCOPY; EMISSION AB Mo wire X pinches typically emit several x-ray bursts from a bright spot near the crossing of the X-pinch wires. Streak camera images of L-shell line emission from Mo wire X pinches have been analyzed using a non-local thermodynamic equilibrium (NLTE) collisional-radiative atomic kinetics model, providing temperature and density profiles with similar to50 ps time resolution over the similar to350 ps x-ray bursts. In conjunction with nonspectroscopic measurements, the analysis is used to propose a picture of the dynamic evolution of the X-pinch plasma. The L-shell spectra from the first x-ray burst indicate an electron density near 10(22) cm(-3) and an electron temperature near 1 keV; subsequent x-ray bursts have L-shell spectra that indicate electron temperatures slightly above 1 keV and electron densities near 10(20) and 10(21) cm(-3). The size of the L-shell line-emitting region is estimated to be near 10 mum for the first x-ray burst and much larger for the later bursts. It is proposed that inner-shell excitation of low ionization stages of Mo in a mum-scale plasma region contributes to the observed radiation from the first micropinch, which typically emits a short burst of >3 keV radiation and has L-shell spectra characterized by broad spectral lines overlaying an intense continuum. C1 Univ Nevada, Phys Dept 220, Reno, NV 89557 USA. Cornell Univ, Plasma Studies Lab, Ithaca, NY 14853 USA. PN Lebedev Phys Inst, Moscow 119991, Russia. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Hansen, SB (reprint author), Univ Nevada, Phys Dept 220, Reno, NV 89557 USA. RI Pikuz, Sergey/M-8231-2015; Shelkovenko, Tatiana/M-8254-2015 NR 19 TC 36 Z9 36 U1 0 U2 3 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 AUG PY 2004 VL 70 IS 2 AR 026402 DI 10.1103/PhysRevE.70.026402 PN 2 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 852VJ UT WOS:000223784600067 PM 15447596 ER PT J AU Kiss, IZ Merkin, JH Neufeld, Z AF Kiss, IZ Merkin, JH Neufeld, Z TI Homogenization induced by chaotic mixing and diffusion in an oscillatory chemical reaction SO PHYSICAL REVIEW E LA English DT Article ID CHLORITE IODIDE REACTION; LAMELLAR SYSTEM; FLOWS; ADVECTION; PATTERNS; BEHAVIOR; DESIGN AB A model for an imperfectly mixed batch reactor with the chlorine dioxide-iodine-malonic acid (CDIMA) reaction, with the mixing being modelled by chaotic advection, is considered. The reactor is assumed to be operating in oscillatory mode and the way in which an initial spatial perturbation becomes homogenized is examined. When the kinetics are such that the only stable homogeneous state is oscillatory then the perturbation is always entrained into these oscillations. The rate at which this occurs is relatively insensitive to the chemical effects, measured by the Damkohler number, and is comparable to the rate of homogenization of a passive contaminant. When both steady and oscillatory states are stable, spatially homogeneous states, two possibilities can occur. For the smaller Damkohler numbers, a localized perturbation at the steady state is homogenized within the background oscillations. For larger Damkohler numbers, regions of both oscillatory and steady behavior can co-exist for relatively long times before the system collapses to having the steady state everywhere. An interpretation of this behavior is provided by the one-dimensional Lagrangian filament model, which is analyzed in detail. C1 Univ Oxford, Dept Zool, Oxford OX1 3PS, England. Univ Leeds, Dept Appl Math, Leeds LS2 9JT, W Yorkshire, England. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Kiss, IZ (reprint author), Univ Oxford, Dept Zool, S Parks Rd, Oxford OX1 3PS, England. EM istvan.kiss@zoo.ox.ac.uk RI Neufeld, Zoltan/C-3008-2011; Kiss, Istvan/C-7392-2014 OI Kiss, Istvan/0000-0003-1473-6644 NR 32 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 1539-3755 J9 PHYS REV E JI Phys. Rev. E PD AUG PY 2004 VL 70 IS 2 AR 026216 DI 10.1103/PhysRevE.70.026216 PN 2 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 852VJ UT WOS:000223784600045 PM 15447574 ER PT J AU Koudella, CR Neufeld, Z AF Koudella, CR Neufeld, Z TI Reaction front propagation in a turbulent flow SO PHYSICAL REVIEW E LA English DT Article ID 2-DIMENSIONAL TURBULENCE; DIFFUSION; MEDIA; PARTICLES; ADVECTION; SYSTEMS; STATES AB The propagation of reaction fronts in a turbulent fluid flow is studied by direct numerical simulations in two space dimensions. The velocity field is obtained from integrating the Navier-Stokes equation in two dimensions. We investigate the structure of the reaction front and the enhancement of the front propagation speed due to turbulent mixing. Consistently with earlier theoretical, predictions and experiments we find two qualitatively different regimes as the Damkohler number-the ratio of eddy turnover times and of the characteristic chemical time scale-is varied, corresponding to a distributed reaction zone and thin wrinkled fronts. C1 Univ Cambridge, Dept Appl Math & Theoret Phys, Ctr Math Sci, Cambridge CB3 0WA, England. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Koudella, CR (reprint author), Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. EM ckoudell@deas.harvard.edu; zoltan@cnls.lanl.gov RI Neufeld, Zoltan/C-3008-2011 NR 33 TC 7 Z9 7 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 AUG PY 2004 VL 70 IS 2 AR 026307 DI 10.1103/PhysRevE.70.026307 PN 2 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 852VJ UT WOS:000223784600059 PM 15447588 ER PT J AU Maira-Vidal, A Gonzalez, MA Jimenez-Ruiz, M Bermejo, FJ Price, DL Enciso, E Saboungi, ML Fernandez-Perea, R Cabrillo, C AF Maira-Vidal, A Gonzalez, MA Jimenez-Ruiz, M Bermejo, FJ Price, DL Enciso, E Saboungi, ML Fernandez-Perea, R Cabrillo, C TI Unconventional density dependence of the stochastic dynamics in an organic liquid SO PHYSICAL REVIEW E LA English DT Article ID AQUEOUS-ELECTROLYTE SOLUTION; NEUTRON-SCATTERING; MIXTURE MODEL; QUINOLINE; PHASE; WATER; TRANSITIONS; RELAXATION; PRESSURE; BEHAVIOR AB The density dependence of the diffusive rotational and center-of-mass dynamics of 2-methyl-pyridine is investigated by means of the concurrent use of quasielastic neutron scattering and molecular dynamics simulations. The dependence of both translation and rotational diffusion coefficients shows a distinctive change of slope with increasing density taking place about rho=0.975 g/cm(3). Such a change in the dynamics can be related to observations made in other liquids composed of oblate-spheroidal particles. C1 CSIC, Inst Estructura Mat, E-28006 Madrid, Spain. Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France. Univ Basque Country, Dept Elect & Elect, Bilbao 48080, Spain. CNRS, Ctr Rech Mat Haute Temp, F-45071 Orleans, France. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Fis 1, E-28080 Madrid, Spain. Univ Orleans, CNRS, Ctr Rech Mat Divisee, F-45071 Orleans 2, France. RP CSIC, Inst Estructura Mat, Serrano 123, E-28006 Madrid, Spain. RI Price, David Long/A-8468-2013; Saboungi, Marie-Louise/C-5920-2013; Fernandez-Perea, Ricardo/E-9118-2016; Gonzalez, Miguel/R-8330-2016 OI Saboungi, Marie-Louise/0000-0002-0607-4815; Fernandez-Perea, Ricardo/0000-0002-4011-2344; Gonzalez, Miguel/0000-0002-3478-0215 NR 31 TC 4 Z9 4 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD AUG PY 2004 VL 70 IS 2 AR 021501 DI 10.1103/PhysRevE.70.021501 PN 1 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 852VH UT WOS:000223784400022 PM 15447490 ER PT J AU Sengupta, P Singh, RRP Cox, DL Slepoy, A AF Sengupta, P Singh, RRP Cox, DL Slepoy, A TI Lateral organization of cholesterol molecules in lipid-cholesterol assemblies SO PHYSICAL REVIEW E LA English DT Article ID CRYSTALLINE PHOSPHATIDYLCHOLINE BILAYERS; THERMOTROPIC PHASE-BEHAVIOR; MONTE-CARLO SIMULATION; 2 DIMENSIONS; REGULAR DISTRIBUTION; MELTING TRANSITION; CONDENSED COMPLEXES; MEMBRANES; MODEL; EQUILIBRIA AB We present results of an off-lattice simulation of a two-component planar system, as a model for lateral organization of cholesterol molecules in lipid-cholesterol assemblies. We explore the existence of "superlattice" structures even in fluid systems, in the absence of an underlying translational long-range order, and study their coupling to hexatic or bond-orientational order. We discuss our results in context of geometric superlattice theories and "condensation complexes" in understanding a variety of experiments in artificial lipid-cholesterol assemblies. C1 Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sengupta, P (reprint author), Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. RI Sengupta, Pinaki/B-6999-2011 NR 35 TC 5 Z9 5 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1539-3755 J9 PHYS REV E JI Phys. Rev. E PD AUG PY 2004 VL 70 IS 2 AR 021902 DI 10.1103/PhysRevE.70.021902 PN 1 PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 852VH UT WOS:000223784400042 ER PT J AU Henestroza, E Eylon, S Roy, PK Yu, SS Anders, A Bieniosek, FM Greenway, WG Logan, BG MacGill, RA Shuman, DB Vanecek, DL Waldron, WL Sharp, WM Houck, TL Davidson, RC Efthimion, PC Gilson, EP Sefkow, AB Welch, DR Rose, DV Olson, CL AF Henestroza, E Eylon, S Roy, PK Yu, SS Anders, A Bieniosek, FM Greenway, WG Logan, BG MacGill, RA Shuman, DB Vanecek, DL Waldron, WL Sharp, WM Houck, TL Davidson, RC Efthimion, PC Gilson, EP Sefkow, AB Welch, DR Rose, DV Olson, CL TI Design and characterization of a neutralized-transport experiment for heavy-ion fusion SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article ID INERTIAL CONFINEMENT FUSION; CHAMBER TRANSPORT; PLASMA; TARGET; BEAMS; PHYSICS; CHARGE AB In heavy-ion inertial-confinement fusion systems, intense beams of ions must be transported from the exit of the final-focus magnet system through the fusion chamber to hit spots on the target with radii of about 2 mm. For the heavy-ion-fusion power-plant scenarios presently favored in the U. S., a substantial fraction of the ion-beam space charge must be neutralized during this final transport. The most effective neutralization technique found in numerical simulations is to pass each beam through a low-density plasma after the final focusing. To provide quantitative comparisons of these theoretical predictions with experiment, the Virtual National Laboratory for Heavy Ion Fusion has completed the construction and has begun experimentation with the neutralized-transport experiment. The experiment consists of three main sections, each with its own physics issues. The injector is designed to generate a very high-brightness, space-charge-dominated potassium beam, while still allowing variable perveance by a beam aperturing technique. The magnetic- focusing section, consisting of four pulsed quadrupoles, permits the study of magnet tuning, as well as the effects of phase-space dilution due to higher-order nonlinear fields. In the final section, the converging ion beam exiting the magnetic section is transported through a drift region with plasma sources for beam neutralization, and the final spot size is measured under various conditions of neutralization. In this paper, we discuss the design and characterization of the three sections in detail and present initial results from the experiment. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. Mission Res Corp, Albuquerque, NM 87110 USA. Sandia Natl Labs, Albuquerque, NM 87107 USA. RP Henestroza, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Anders, Andre/B-8580-2009 OI Anders, Andre/0000-0002-5313-6505 NR 42 TC 31 Z9 31 U1 0 U2 1 PU AMERICAN 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 AUG PY 2004 VL 7 IS 8 AR 083501 DI 10.1103/PhysRevSTAB.7.083501 PG 29 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 853VZ UT WOS:000223858400004 ER PT J AU Shaftan, T Huang, Z AF Shaftan, T Huang, Z TI Experimental characterization of a space charge induced modulation in high-brightness electron beam SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article ID INSTABILITY; LASER AB We present the experimental investigation of a collective effect driving strong modulation in the longitudinal phase space of a high-brightness electron beam. The measured beam energy spectrum was analyzed in order to reveal the main parameters of modulation. The experimental results were compared with a model of space-charge oscillations in the beam longitudinal phase space. The measurements and analysis allowed us to determine the range of the parameters of the observed effect on the modulation dynamics and illustrate its potential impact on short-wavelength free-electron laser performance. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Shaftan, T (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RI Shaftan, Timur/A-8443-2009 NR 29 TC 26 Z9 26 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 AUG PY 2004 VL 7 IS 8 AR 080702 DI 10.1103/PhysRevSTAB.7.080702 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 853VZ UT WOS:000223858400003 ER PT J AU Wolski, A Penn, G Sessler, A Wurtele, J AF Wolski, A Penn, G Sessler, A Wurtele, J TI Beam conditioning for free electron lasers: Consequences and methods SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB The consequences of beam conditioning in four example cases [VISA, a soft x-ray free-electron laser (FEL), LCLS, and a "Greenfield'' FEL] are examined. It is shown that in emittance limited cases, proper conditioning reduces sensitivity to the transverse emittance and, furthermore, allows for stronger focusing in the undulator. Simulations show higher saturation power, with gain lengths reduced by a factor of 2 or more. The beam dynamics in a general conditioning system are studied, with "matching conditions'' derived for achieving conditioning without growth in the effective emittance. Various conditioning lattices are considered, and expressions derived for the amount of conditioning provided in each case when the matching conditions are satisfied. These results show that there is no fundamental obstacle to producing beam conditioning, and that the problem can be reduced to one of proper lattice design. Nevertheless, beam conditioning will not be easy to implement in practice. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Wolski, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI wurtele, Jonathan/J-6278-2016; OI wurtele, Jonathan/0000-0001-8401-0297; Wolski, Andrzej/0000-0002-5057-5588 NR 11 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN 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 AUG PY 2004 VL 7 IS 8 AR 080701 DI 10.1103/PhysRevSTAB.7.080701 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 853VZ UT WOS:000223858400002 ER PT J AU Gordillo, JM Cheng, ZD Ganan-Calvo, AM Marquez, M Weitz, DA AF Gordillo, JM Cheng, ZD Ganan-Calvo, AM Marquez, M Weitz, DA TI A new device for the generation of microbubbles SO PHYSICS OF FLUIDS LA English DT Article ID DETACHMENT AB In this paper we present a new method for the production of bubble-liquid suspensions (from now on BLS) composed of micron-sized bubbles and with gas to liquid volume ratios larger than unity. We show that the BLS gas fraction lambda=Q(g)/Q(l), being Q(g) and Q(l) the flow rates of gas and liquid, respectively, is controlled by a dimensionless parameter which accounts for the ratio of the gas pressure inside the device to the liquid viscous pressure drop from the orifices where the liquid is injected to the exit, where the BLS is obtained. This parameter permits the correct scaling of the BLS gas volume fraction of all the experiments presented. (C) 2004 American Institute of Physics. C1 Univ Sevilla, Escuela Super Ingn, Grp Mecan Fluidos, Seville 41092, Spain. Harvard Univ, Dept Phys, Cambridge, MA 02138 USA. Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. Natl Inst Stand & Technol, Computat Chem Grp, Phys & Chem Properties Div, Gaithersburg, MD 20899 USA. RP Gordillo, JM (reprint author), Univ Sevilla, Escuela Super Ingn, Grp Mecan Fluidos, Camino Descubrimientos S-N, Seville 41092, Spain. EM gordillo@eurus2.us.es; weitz@deas.harvard.edu RI Gordillo, Jose Manuel/L-3362-2014; Ganan-Calvo, Alfonso/F-1169-2013; Gordillo Arias de Saavedra, Jose Manuel/A-6209-2008 OI Gordillo, Jose Manuel/0000-0003-1431-3780; Gordillo Arias de Saavedra, Jose Manuel/0000-0003-1431-3780 NR 15 TC 91 Z9 93 U1 1 U2 28 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD AUG PY 2004 VL 16 IS 8 BP 2828 EP 2834 DI 10.1063/1.1737739 PG 7 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 836AY UT WOS:000222528300010 ER PT J AU Livescu, D Madnia, CK AF Livescu, D Madnia, CK TI Small scale structure of homogeneous turbulent shear flow SO PHYSICS OF FLUIDS LA English DT Article ID DIRECT-NUMERICAL-SIMULATION; COMPRESSIBLE TURBULENCE; DERIVATIVE MOMENTS; NUMBER AB The structure of homogeneous turbulent shear flow is studied using data generated by direct numerical simulations (DNS) and a linear analysis for both compressible and incompressible cases. At large values of the mean shear rate, the rapid distortion theory (RDT) limit is approached. Analytical solutions are found for the inviscid compressible RDT equations at long times. The RDT equations are also solved numerically for both inviscid and viscous cases. The RDT solutions, confirmed by the DNS results, show that the even order transverse derivative moments of the dilatational and solenoidal velocity fields are anisotropic, with the dilatational motions more anisotropic than their solenoidal counterparts. The results obtained for the incompressible case are similar to those obtained for the solenoidal motions in the compressible case. The DNS results also indicate an increase in the anisotropy of the even order transverse derivative moments with the order of the moment, in agreement with the RDT predictions. Although the anisotropy decreases with Reynolds number, it is likely that for higher even order moments it will persist at large values of the Reynolds number, in contrast with the postulate of local isotropy. The RDT solutions also predict that the normalized odd order transverse derivative moments of the solenoidal velocity for the compressible case and of the velocity for the incompressible case should approach a constant different than zero at large times. This prediction is supported by the DNS data. For higher odd order normalized moments, the RDT analysis suggests that the anisotropy may persist at large values of the Reynolds number, in agreement with the existent experimental data. The amplification of the dilatational kinetic energy in the direction of the mean shear and the anisotropy of the dilatational dissipation tensor found in the DNS results are also consistent with the RDT analysis. (C) 2004 American Institute of Physics. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. SUNY Buffalo, Dept Mech & Aerosp Engn, Buffalo, NY 14260 USA. RP Livescu, D (reprint author), Los Alamos Natl Lab, CCS-2 MS B296, Los Alamos, NM 87545 USA. EM livescu@lanl.gov; madnia@eng.buffalo.edu OI Livescu, Daniel/0000-0003-2367-1547 NR 31 TC 17 Z9 17 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 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD AUG PY 2004 VL 16 IS 8 BP 2864 EP 2876 DI 10.1063/1.1760771 PG 13 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 836AY UT WOS:000222528300014 ER PT J AU Boswell, BA Dutton, JC AF Boswell, BA Dutton, JC TI Shear layer development in a three-dimensional compressible base flow SO PHYSICS OF FLUIDS LA English DT Article ID TURBULENT BOUNDARY-LAYER; VELOCITY-MEASUREMENTS; SEPARATED FLOWS; RAPID EXPANSION; REYNOLDS STRESS; WALL AB The structure and characteristics of the shear layer embedded in a three-dimensional, compressible, separated flow were investigated experimentally. The investigation focused on three primary areas: shear layer initiation at the base-corner separation point, development of the three-dimensional shear layer enclosing the recirculation region, and the turbulence structure near reattachment. The primary data presented are mean velocity and turbulence fluctuations measured using two-component laser-Doppler velocimetry. Initiation of the shear layer at the base-corner separation point results in an increase of all measured turbulent stresses, and a change in orientation of the turbulent structures. The shear layer growth rate is observed to vary with circumferential angle, with growth occurring at a much faster rate in the leeward plane than in the windward. Throughout the reattachment region, the turbulent stresses do not appear to diminish in the streamwise direction, contrary to previously published results for axisymmetric base flows. In addition, the reattachment phenomenon tends to slightly decrease overall turbulent structure organization. (C) 2004 American Institute of Physics. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA. RP Boswell, BA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 25 TC 1 Z9 1 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD AUG PY 2004 VL 16 IS 8 BP 3031 EP 3044 DI 10.1063/1.1768550 PG 14 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 836AY UT WOS:000222528300026 ER PT J AU Ramaprabhu, P Andrews, MJ AF Ramaprabhu, P Andrews, MJ TI On the initialization of Rayleigh-Taylor simulations SO PHYSICS OF FLUIDS LA English DT Article ID ATWOOD NUMBER; INSTABILITY AB We demonstrate that, when initialized with experimental data, numerical simulations of Rayleigh-Taylor mixing show reasonable agreement with experimental measurements of the self-similar growth rate alpha. The experimental data include high-resolution velocity and density measurements from a closed water channel facility. For the simulations, a monotone integrated large eddy simulations technique was used that employed a finite-volume, Eulerian equation solver with van Leer flux limiters. Calculations were initialized with both density and velocity fluctuations. A comparison of the late-time, self-similar growth constant with the experiments showed simulations initialized with velocity perturbations gave better agreement with experiments. (C) 2004 American Institute of Physics. C1 Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Andrews, MJ (reprint author), Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA. EM mandrews@mengr.tamu.edu NR 15 TC 13 Z9 13 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD AUG PY 2004 VL 16 IS 8 BP L59 EP L62 DI 10.1063/1.1765171 PG 4 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 836AY UT WOS:000222528300001 ER PT J AU Whitney, KG Thornhill, JW Apruzese, JP Davis, J Deeney, C Coverdale, CA AF Whitney, KG Thornhill, JW Apruzese, JP Davis, J Deeney, C Coverdale, CA TI Enhanced energy coupling and x-ray emission in Z-pinch plasma implosions SO PHYSICS OF PLASMAS LA English DT Article ID WIRE-ARRAY IMPLOSIONS; RADIATIVE COLLAPSE; MODEL; INSTABILITY; DEPOSITION; GENERATORS; DYNAMICS; STATE AB Recent experiments conducted on the Saturn pulsed-power generator at Sandia National Laboratories [R. B. Spielman , in Proceedings of the Second International Conference on Dense Z Pinches, Laguna Beach, CA, 1989, edited by N. R. Pereira, J. Davis, and N. Rostoker (American Institute of Physics, New York, 1989), p. 3] have produced large amounts of x-ray output, which cannot be accounted for in conventional magnetohydrodynamic (MHD) calculations. In these experiments, the Saturn current had a rise time of similar to180 ns in contrast to a rise time of similar to60 ns in Saturn's earlier mode of operation. In both aluminum and tungsten wire-array Z-pinch implosions, 2-4 times more x-ray output was generated than could be supplied according to one-dimensional (1D) magnetohydrodynamic calculations by the combined action of the jxB acceleration forces and ohmic heating (as described by a classical Braginskii resistivity). In this paper, we reexamine the problem of coupling transmission line circuits to plasma fluid equations and derive expressions for the Z-pinch load circuit resistance and inductance that relate these quantities in a 1D analysis to the surface resistivity of the fluid, and to the magnetic field energy that is stored in the vacuum diode, respectively. Enhanced energy coupling in this analysis, therefore, comes from enhancements to the surface resistivity, and we show that plasma resistivities approximately three orders of magnitude larger than classical are needed in order to achieve energy inputs that are comparable to the Saturn experiment x-ray outputs. Large enhancements of the plasma resistivity increase the rate of magnetic field and current diffusion, significantly modify the qualitative features of the MHD, and raise important questions as to how the plasma fluid dynamics converts enhanced energy inputs into enhanced x-ray outputs. One-dimensional MHD calculations in which resistivity values are adjusted phenomenologically are used to illustrate how various dynamical assumptions influence the way enhanced energy inputs are channeled by the fluid dynamics. Variations in the parameters of the phenomenological model are made in order to determine how sensitively they influence the dynamics and the degree to which the calculated x-ray outputs can be made to replicate the kinds of large variations in the experimental x-ray power data that were observed in three nominally identical aluminum wire shots on Saturn. (C) 2004 American Institute of Physics. C1 USN, Res Lab, Div Plasma Phys, Radiat Hydrodynam Branch, Washington, DC 20375 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Whitney, KG (reprint author), Berkeley Scholars, POB 852, Springfield, VA 22150 USA. EM whitney@ppdu.nrl.navy.mil NR 34 TC 29 Z9 29 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 3700 EP 3714 DI 10.1063/1.1760093 PG 15 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000003 ER PT J AU Shaing, KC Peng, M AF Shaing, KC Peng, M TI Transport theory for potato orbits in an axisymmetric torus with finite toroidal flow speed SO PHYSICS OF PLASMAS LA English DT Article ID ION-TRANSPORT; MAGNETIC AXIS; NEOCLASSICAL TRANSPORT; ELECTRIC-FIELD; PLASMAS; TOKAMAKS; FLUCTUATIONS; NSTX AB Transport theory for potato orbits in the region near the magnetic axis in an axisymmetric torus such as tokamaks and spherical tori is extended to the situation where the toroidal flow speed is of the order of the sonic speed as observed in National Spherical Torus Experiment [E. J. Synakowski, M. G. Bell, R. E. Bell , Nucl. Fusion 43, 1653 (2003)]. It is found that transport fluxes such as ion radial heat flux, and bootstrap current density are modified by a factor of the order of the square of the toroidal Mach number. The consequences of the orbit squeezing are also presented. The theory is developed for parabolic (in radius r) plasma profiles. A method to apply the results of the theory for the transport modeling is discussed. (C) 2004 American Institute of Physics. C1 Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Shaing, KC (reprint author), Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA. NR 20 TC 2 Z9 2 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 3726 EP 3732 DI 10.1063/1.1761536 PG 7 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000006 ER PT J AU Smith, DR Reiman, AH AF Smith, DR Reiman, AH TI Analytic, high-beta solutions of the helical Grad-Shafranov equation SO PHYSICS OF PLASMAS LA English DT Article ID ASPECT RATIO TOKAMAK; PLASMA; EQUILIBRIUM; SYMMETRY AB Analytic, high-beta [betasimilar toO(1)], helical equilibrium solutions are presented for a class of helical axis configurations having large helical aspect ratio, with the helix assumed to be tightly wound. The solutions develop a narrow boundary layer of strongly compressed flux, similar to that previously found in high-beta tokamak equilibrium solutions. The boundary layer is associated with a strong localized current which prevents the equilibrium from having zero net current. (C) 2004 American Institute of Physics. C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Smith, DR (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 11 TC 1 Z9 1 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 3752 EP 3757 DI 10.1063/1.1763576 PG 6 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000010 ER PT J AU van Milligen, BP Carreras, BA Sanchez, R AF van Milligen, BP Carreras, BA Sanchez, R TI Uphill transport and the probabilistic transport model SO PHYSICS OF PLASMAS LA English DT Article ID SELF-ORGANIZED CRITICALITY; TOKAMAK PROJECT PLASMAS; HEAT-TRANSPORT; TURBULENT TRANSPORT; ANOMALOUS TRANSPORT; INWARD TRANSPORT; STELLARATOR; BARRIERS; PARADIGM; DYNAMICS AB Profile consistency is a long-standing mystery of transport in thermonuclear fusion plasmas. This phenomenon is critically tested by studying the system response to off-axis fueling or heating. The present paper investigates the potential of a recently proposed probabilistic transport model to simulate this phenomenon, and it is found that most of the observed phenomenology can be reproduced, at least qualitatively. In particular, the observed differences between tokamaks and stellarators under off-axis heating may find an explanation in this framework. (C) 2004 American Institute of Physics. C1 Asociac EURATOM CIEMAT Fus, Madrid 28040, Spain. Oak Ridge Natl Lab, Div Fus Energy, Oak Ridge, TN 37831 USA. Univ Carlos III, Dept Fis, Leganes 28911, Spain. RP van Milligen, BP (reprint author), Asociac EURATOM CIEMAT Fus, Ave Complutense 22, Madrid 28040, Spain. RI Sanchez, Raul/C-2328-2008; van Milligen, Boudewijn/H-5121-2015 OI van Milligen, Boudewijn/0000-0001-5344-6274 NR 34 TC 21 Z9 21 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 3787 EP 3794 DI 10.1063/1.1763915 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000015 ER PT J AU del-Castillo-Negrete, D Carreras, BA Lynch, VE AF del-Castillo-Negrete, D Carreras, BA Lynch, VE TI Fractional diffusion in plasma turbulence SO PHYSICS OF PLASMAS LA English DT Article ID ANOMALOUS DIFFUSION; ENERGY CONFINEMENT; RANDOM-WALKS; TRANSPORT; PROPAGATION; MODEL AB Transport of tracer particles is studied in a model of three-dimensional, resistive, pressure-gradient-driven plasma turbulence. It is shown that in this system transport is anomalous and cannot be described in the context of the standard diffusion paradigm. In particular, the probability density function (pdf) of the radial displacements of tracers is strongly non-Gaussian with algebraic decaying tails, and the moments of the tracer displacements exhibit superdiffusive scaling. To model these results we present a transport model with fractional derivatives in space and time. The model incorporates in a unified way nonlocal effects in space (i.e., non-Fickian transport), memory effects (i.e., non-Markovian transport), and non-Gaussian scaling. There is quantitative agreement between the turbulence transport calculations and the fractional diffusion model. In particular, the model reproduces the shape and space-time scaling of the pdf, and the superdiffusive scaling of moments. (C) 2004 American Institute of Physics. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM delcastillod@ornl.gov RI Lynch, Vickie/J-4647-2012; OI Lynch, Vickie/0000-0002-5836-7636; del-Castillo-Negrete, Diego/0000-0001-7183-801X NR 34 TC 86 Z9 89 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 3854 EP 3864 DI 10.1063/1.1767097 PG 11 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000024 ER PT J AU Ricci, P Brackbill, JU Daughton, W Lapenta, G AF Ricci, P Brackbill, JU Daughton, W Lapenta, G TI Collisionless magnetic reconnection in the presence of a guide field SO PHYSICS OF PLASMAS LA English DT Article ID HYBRID DRIFT INSTABILITY; PLASMA SIMULATION; CURRENT SHEETS; HALL CURRENT; ACCELERATION; DISSIPATION; MAGNETOTAIL; DIMENSIONS; CHALLENGE; DYNAMICS AB The results of kinetic simulations of magnetic reconnection in Harris current sheets are analyzed. A range of guide fields is considered to study reconnection in plasmas characterized by different beta values, beta>m(e)/m(i). Both an implicit particle-in-cell (PIC) simulation method and a parallel explicit PIC code are used. Simulations with mass ratios up to the physical value are performed. The simulations show that the reconnection rate decreases with the guide field and depends weakly on the mass ratio. The off-diagonal components of the electron pressure tensor break the frozen-in condition, even in low beta plasmas. In high beta plasmas, evidence is presented that whistler waves play a key role in the fast reconnection physics, while in low beta plasmas the kinetic Alfven waves are important. The in-plane and the out-of-plane ion and electron motion are also considered, showing that they are influenced by the mass ratio and the plasma beta. (C) 2004 American Institute of Physics. C1 Politecn Torino, INFM, I-10129 Turin, Italy. Politecn Torino, Dipartimento Energet, Turin, Italy. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Politecn Torino, INFM, Corso Duca Abruzzi 24, I-10129 Turin, Italy. EM paolo.ricci@polito.it; jub@lanl.gov; daughton@lanl.gov; lapenta@lanl.gov RI Daughton, William/L-9661-2013; OI Lapenta, Giovanni/0000-0002-3123-4024 NR 43 TC 106 Z9 107 U1 0 U2 17 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 4102 EP 4114 DI 10.1063/1.1768552 PG 13 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000051 ER PT J AU Robey, HF AF Robey, HF TI Effects of viscosity and mass diffusion in hydrodynamically unstable plasma flows SO PHYSICS OF PLASMAS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; RICHTMYER-MESHKOV INSTABILITY; OMEGA LASER SYSTEM; SUPERNOVA HYDRODYNAMICS; NOVA LASER; GROWTH; SIMULATION; INTERFACE; FUSION; SCALE AB Hydrodynamically unstable plasma flows driven by intense laser radiation are described in which an interface between two materials of dissimilar densities is subjected to a very strong shock and then decelerated over a longer time scale. Preimposed perturbations on this interface are unstable to a combination of the Richtmyer-Meshkov (RM) and Rayleigh-Taylor (RT) instabilities. Overall target dimensions for these experiments are of the order of 1 mm, and length scales of the unstable perturbations of interest can be as small as a few microns. At such small spatial scales, the effects of dissipative processes such as viscosity, thermal conductivity, and mass diffusion begin to affect instability growth rates. In this article, estimates are presented of the spatial scale at which viscosity and mass diffusion begin to affect the growth of a perturbation due to the RM and RT instabilities. Time dependent values for the plasma kinematic viscosity and interfacial binary mass diffusivity are estimated for the conditions occurring in laser-driven instability experiments recently conducted on the Omega laser. These are used together with several models in the literature for estimating the reduction in the growth rate dispersion curves of the Rayleigh-Taylor and Richtmyer-Meshkov instabilities due to the presence of these small-scale dissipative effects. (C) 2004 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 33 TC 26 Z9 27 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP 4123 EP 4133 DI 10.1063/1.1772377 PG 11 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000053 ER PT J AU Celliers, PM Collins, GW Hicks, DG Koenig, M Henry, E Benuzzi-Mounaix, A Batani, D Bradley, DK Da Silva, LB Wallace, RJ Moon, SJ Eggert, JH Lee, KKM Benedetti, LR Jeanloz, R Masclet, I Dague, N Marchet, B Le Gloahec, MR Reverdin, C Pasley, J Willi, O Neely, D Danson, C AF Celliers, PM Collins, GW Hicks, DG Koenig, M Henry, E Benuzzi-Mounaix, A Batani, D Bradley, DK Da Silva, LB Wallace, RJ Moon, SJ Eggert, JH Lee, KKM Benedetti, LR Jeanloz, R Masclet, I Dague, N Marchet, B Le Gloahec, MR Reverdin, C Pasley, J Willi, O Neely, D Danson, C TI Electronic conduction in shock-compressed water SO PHYSICS OF PLASMAS LA English DT Article ID ELECTRICAL-CONDUCTIVITY; PRESSURE; LASER; PHASE; GPA; TEMPERATURE; NEPTUNE; MBAR AB The optical reflectance of a strong shock front in water increases continuously with pressure above 100 GPa and saturates at similar to45% reflectance above 250 GPa. This is the first evidence of electronic conduction in high pressure water. In addition, the water Hugoniot equation of state up to 790 GPa (7.9 Mbar) is determined from shock velocity measurements made by detecting the Doppler shift of reflected light. From a fit to the reflectance data we find that an electronic mobility gap similar to2.5 eV controls thermal activation of electronic carriers at pressures in the range of 100-150 GPa. This suggests that electronic conduction contributes significantly to the total conductivity along the Neptune isentrope above 150 GPa. (C) 2004 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Paris 06, Ecole Polytech, CEA,CNRS,Unite Mixte 7605, LULI, F-91128 Palaiseau, France. Univ Milano Bicocca, Dipartimento Fis G Occhialini, I-20126 Milan, Italy. INFM, I-20126 Milan, Italy. Univ Calif Berkeley, Berkeley, CA 94720 USA. CEA, DAM Ile France, F-91680 Bruyeres Le Chatel, France. Univ London Imperial Coll Sci Technol & Med, London, England. Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England. RP Celliers, PM (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RI Collins, Gilbert/G-1009-2011; Koenig, Michel/A-2167-2012; Hicks, Damien/B-5042-2015; Brennan, Patricia/N-3922-2015 OI Hicks, Damien/0000-0001-8322-9983; NR 33 TC 64 Z9 69 U1 1 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD AUG PY 2004 VL 11 IS 8 BP L41 EP L44 DI 10.1063/1.1758944 PG 4 WC Physics, Fluids & Plasmas SC Physics GA 840CQ UT WOS:000222835000001 ER PT J AU Libby, SB Weiss, MS AF Libby, SB Weiss, MS TI Edward Teller's scientific life SO PHYSICS TODAY LA English DT Biographical-Item C1 Lawrence Livermore Natl Lab, Theory & Modeling Grp, High Energy Dens Div, Dept Phys, Livermore, CA 94550 USA. Livermore Phys Dept, Nucl & Particle Phys Div, Livermore, CA USA. RP Libby, SB (reprint author), Lawrence Livermore Natl Lab, Theory & Modeling Grp, High Energy Dens Div, Dept Phys, Livermore, CA 94550 USA. NR 0 TC 1 Z9 1 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD AUG PY 2004 VL 57 IS 8 BP 45 EP 50 DI 10.1063/1.1801867 PG 6 WC Physics, Multidisciplinary SC Physics GA 842KS UT WOS:000223003600026 ER PT J AU Brown, H May, M AF Brown, H May, M TI Edward Teller in the public arena SO PHYSICS TODAY LA English DT Biographical-Item C1 Ctr Strateg & Int Studies, Washington, DC 20006 USA. Stanford Univ, Ctr Int Secur & Cooperat, Stanford, CA 94305 USA. Lawrence Livermore Natl Lab, Livermore, CA USA. RP Brown, H (reprint author), Ctr Strateg & Int Studies, Washington, DC 20006 USA. NR 0 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD AUG PY 2004 VL 57 IS 8 BP 51 EP 53 DI 10.1063/1.1801868 PG 3 WC Physics, Multidisciplinary SC Physics GA 842KS UT WOS:000223003600027 ER PT J AU Crease, RP AF Crease, RP TI Proteins, art and science SO PHYSICS WORLD LA English DT Editorial Material C1 SUNY Stony Brook, Dept Philosophy, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Crease, RP (reprint author), SUNY Stony Brook, Dept Philosophy, Stony Brook, NY 11794 USA. EM rcrease@notes.cc.sunysb.edu NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8585 J9 PHYS WORLD JI Phys. World PD AUG PY 2004 VL 17 IS 8 BP 18 EP 18 PG 1 WC Physics, Multidisciplinary SC Physics GA 849SP UT WOS:000223561300020 ER PT J AU Campbell, L Brunger, MJ Cartwright, DC Teubner, PJO AF Campbell, L Brunger, MJ Cartwright, DC Teubner, PJO TI Production of vibrationally excited N-2 by electron impact SO PLANETARY AND SPACE SCIENCE LA English DT Article DE electron; energy; transfer; rates ID SCATTERING CROSS-SECTIONS; ENERGY TRANSFER RATES; MOLECULE SCATTERING; EXCITATION; NITROGEN AB Energy transfer from electrons to neutral gases and ions is one of the dominant electron cooling processes in the ionosphere, and the role of vibrationally excited N-2 in this is particularly significant. We report here the results from a new calculation of electron energy transfer rates (Q) for vibrational excitation of N-2, as a function of the electron temperature T-c. The present study was motivated by the development of a new cross-section compilation for vibrational excitation processes in N-2 which supercedes those used in the earlier calculations of the electron energy transfer rates. We show that the energy dependence and magnitude of these cross sections, particularly in the region of the well-known (2)Pi(g) resonance in N-2, significantly affect the calculated values of Q. A detailed comparison between the current and previous calculated electron energy transfer rates is made and coefficients are provided so that these rates for transitions from level 0 to levels 1-10 can be calculated for electron temperatures less than 6000 K. (C) 2004 Elsevier Ltd. All rights reserved. C1 Flinders Univ S Australia, SoCPES, Adelaide, SA 5001, Australia. Los Alamos Natl Labs, Div Theoret, Los Alamos, NM 87545 USA. RP Brunger, MJ (reprint author), Flinders Univ S Australia, SoCPES, GPO Box 2100, Adelaide, SA 5001, Australia. EM michael.brunger@flinders.edu.au OI Campbell, Laurence/0000-0003-0728-554X NR 25 TC 28 Z9 28 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD AUG PY 2004 VL 52 IS 9 BP 815 EP 822 DI 10.1016/j.pss.2004.03.004 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 838DQ UT WOS:000222694000004 ER PT J AU Posewitz, MC Smolinski, SL Kanakagiri, S Melis, A Seibert, M Ghirardi, ML AF Posewitz, MC Smolinski, SL Kanakagiri, S Melis, A Seibert, M Ghirardi, ML TI Hydrogen photoproduction is attenuated by disruption of an isoamylase gene in Chlamydomonas reinhardtii SO PLANT CELL LA English DT Article ID STARCH GRANULE INITIATION; GREEN-ALGA; NUCLEAR TRANSFORMATION; FE-HYDROGENASE; REDOX STATE; LIGHT; MECHANISM; EVOLUTION; MUTANTS; BIOSYNTHESIS AB DNA insertional transformants of Chlamydomonas reinhardtii were screened chemochromically for attenuated H-2 production. One mutant, displaying low H-2 gas photoproduction, has a nonfunctional copy of a gene that shows high homology to the family of isoamylase genes found in several photosynthetic organisms. DNA gel blotting and gene complementation were used to link this isoamylase gene to previously characterized nontagged sta7 mutants. This mutant is therefore denoted sta7-10. In C. reinhardtii, the STA7 isoamylase gene is important for the accumulation of crystalline starch, and the sta7-10 mutant reported here contains <3% of the glucose found in insoluble starch when compared with wild-type control cells. Hydrogen photoproduction rates, induced after several hours of dark, anaerobic treatment, are attenuated in sta7 mutants. RNA gel blot analysis indicates that the mRNA transcripts for both the HydA1 and HydA2 [Fe]-hydrogenase genes are expressed in the sta7-10 mutant at greater than wild-type levels 0.5 h after anaerobic induction. However, after 1.5 h, transcript levels of both HydA1 and HydA2 begin to decline rapidly and reach nearly undetectable levels after 7 h. In wildtype cells, the hydrogenase transcripts accumulate more slowly, reach a plateau after 4 h of anaerobic treatment, and maintain the same level of expression for >7 h under anaerobic incubation. Complementation of mutant cells with genomic DNA corresponding to the STA7 gene restores both the starch accumulation and H2 production phenotypes. The results indicate that STA7 and starch metabolism play an important role in C. reinhardtii H-2 photoproduction. Moreover, the results indicate that mere anaerobiosis is not sufficient to maintain hydrogenase gene expression without the underlying physiology, an important aspect of which is starch metabolism. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. RP Ghirardi, ML (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM matttew_posewitz@nrel.gov; maria_ghirardi@nrel.gov NR 78 TC 94 Z9 99 U1 2 U2 25 PU AMER SOC PLANT BIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA SN 1040-4651 J9 PLANT CELL JI Plant Cell PD AUG PY 2004 VL 16 IS 8 BP 2151 EP 2163 DI 10.1105/tpc.104.021972 PG 13 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA 844XS UT WOS:000223195000016 PM 15269330 ER PT J AU Freeman, JL Persans, MW Nieman, K Albrecht, C Peer, W Pickering, IJ Salt, DE AF Freeman, JL Persans, MW Nieman, K Albrecht, C Peer, W Pickering, IJ Salt, DE TI Increased glutathione biosynthesis plays a role in nickel tolerance in Thlaspi nickel hyperaccumulators SO PLANT CELL LA English DT Article ID BACTERIAL SERINE ACETYLTRANSFERASE; RESTRICTION-SITE VARIATION; RAY-ABSORPTION SPECTROSCOPY; HEAVY-METAL DETOXIFICATION; INDUCED OXIDATIVE STRESS; VULGARIS MOENCH GARCKE; ARABIDOPSIS-THALIANA; SILENE-VULGARIS; ZINC TOLERANCE; PHYLOGENETIC-RELATIONSHIPS AB Worldwide more than 400 plant species are now known that hyperaccumulate various trace metals (Cd, Co, Cu, Mn, Ni, and Zn), metalloids (As) and nonmetals [Se) in their shoots. Of these, almost one-quarter are Brassicaceae family members, including numerous Thlaspi species that hyperaccumulate Ni up to 3% of there shoot dry weight. We observed that concentrations of glutathione, Cys, and O-acetyl-L-serine (OAS), in shoot tissue, are strongly correlated with the ability to hyperaccumulate Ni in various Thlaspi hyperaccumulators collected from serpentine soils, including Thlaspi goesingense, T. oxyceras, and T. rosulare, and nonaccumulator relatives, including T. perfoliatum, T. arvense, and Arabidopsis thaliana. Further analysis of the Austrian Ni hyperaccumulator T. goesingense revealed that the high concentrations of OAS, Cys, and GSH observed in this hyperaccumulator coincide with constitutively high activity of both serine acetyltransferase (SAT) and glutathione reductase. SAT catalyzes the acetylation Of L-Ser to produce OAS, which acts as both a key positive regulator of sulfur assimilation and forms the carbon skeleton for Cys biosynthesis. These changes in Cys and GSH metabolism also coincide with the ability of T. goesingense to both hyperaccumulate Ni and resist its damaging oxidative effects. Overproduction of T. goesingense SAT in the nonaccumulator Brassicaceae family member Arabidopsis was found to cause accumulation of OAS, Cys, and glutathione, mimicking the biochemical changes observed in the Ni hyperaccumulators. In these transgenic Arabidopsis, glutathione concentrations strongly correlate with increased resistance to both the growth inhibitory and oxidative stress induced effects of Ni. Taken together, such evidence supports our conclusion that elevated GSH concentrations, driven by constitutively elevated SAT activity, are involved in conferring tolerance to Ni-induced oxidative stress in Thlaspi Ni hyperaccumulators. C1 Purdue Univ, Ctr Plant Environm Stress Physiol, W Lafayette, IN 47907 USA. Stanford Synchrotron Radiat Lab, Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Salt, DE (reprint author), Purdue Univ, Ctr Plant Environm Stress Physiol, W Lafayette, IN 47907 USA. EM dsalt@purdue.edu RI Salt, David/B-3864-2009; Freeman, John/C-4910-2009; Peer, Wendy/H-2970-2013; Pickering, Ingrid/A-4547-2013 OI Peer, Wendy/0000-0003-0046-7324; NR 85 TC 211 Z9 236 U1 6 U2 47 PU AMER SOC PLANT BIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA SN 1040-4651 J9 PLANT CELL JI Plant Cell PD AUG PY 2004 VL 16 IS 8 BP 2176 EP 2191 DI 10.1105/tpc.104.023036 PG 16 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA 844XS UT WOS:000223195000018 PM 15269333 ER PT J AU Mazzucato, E AF Mazzucato, E TI Microwave imaging reflectometry for the measurement of turbulent fluctuations in tokamaks SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID DENSITY-FLUCTUATIONS; PLASMAS; TRANSPORT AB This paper describes a numerical study of microwave reflectometry for the measurement of turbulent fluctuations in tokamak-like plasmas with a cylindrical geometry. Similarly to what was found previously in plane-stratified plasmas, the results indicate that the characteristics of density fluctuations cannot be uniquely determined from the reflected waves if the latter are allowed to propagate freely to the point of detection, as in standard reflectometry. Again, we find that if the amplitude of fluctuations is below a threshold that is set by the spectrum of poloidal wave numbers, the local characteristics of density fluctuations can be obtained from the phase of the reflected waves when these are collected with a wide aperture antenna, and an image of the cut-off is formed onto an array of phase-sensitive detectors. C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Mazzucato, E (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. EM mazzucato@pppl.gov NR 14 TC 11 Z9 11 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD AUG PY 2004 VL 46 IS 8 BP 1271 EP 1282 AR PII S0741-3335(04)75447-8 DI 10.1088/0741-3335/46/8/008 PG 12 WC Physics, Fluids & Plasmas SC Physics GA 850EV UT WOS:000223594900008 ER PT J AU Belo, P Parail, V Corrigan, G Heading, D Houlberg, W Monier-Garbet, P Ongena, J AF Belo, P Parail, V Corrigan, G Heading, D Houlberg, W Monier-Garbet, P Ongena, J CA JET EFDA contributors TI Impurity penetration through the edge transport barrier SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID ELMY H-MODE; PARTICLE-TRANSPORT; ASDEX UPGRADE; NEOCLASSICAL TRANSPORT; HIGH-DENSITY; PLASMAS; JET; DISCHARGES; TOKAMAK; ENERGY AB The ELMs in H-mode plasmas manifest themselves as short bursts of increased edge transport, which expel energy and particles, including impurities from the plasma edge to the SOL and further towards target plates and limiters (Zohm H 1996 Plasma Phys. Control. Fusion 38 1213, Loarte A et al 2003 Plasma Phys. Control. Fusion 45 1549). ELMs are considered beneficial events with respect to impurities since they can prevent impurities from accumulating in the plasma core. JET has recently performed an experiment in which a controlled influx of noble gas impurities was successfully used in order to reduce the amplitude and frequency of type-l ELMs. An interesting correlation between the level of the main gas puffing and the radial redistribution of impurities has been found in this experiment: it was shown that impurities are contained near the separatrix in discharges with a relatively strong level of main gas puffing. Reduction of the puffing below a certain level leads to impurity accumulation in the core followed by thermal collapse. This paper describes the results of predictive modelling of impurity seeding experiments on JET using a coupling of the 1.5D core transport code JETTO (for the main ions) and ID transport code SANCO (for impurities). Two sets of boundary conditions for the density and temperatures, which correspond to two different deuterium gas puffing rates, were used in the modelling. An explanation for the experimentally observed phenomenon is presented. C1 EURATOM, IST Fus Assoc, Ctr Fusao Nucl, P-1049001 Lisbon, Portugal. UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. CEN Cadarache, EURATOM Assoc, F-13108 St Paul Les Durance, France. EURATOM, Plasma Phys Lab, Lab Plasmafys, Ecole Royale Mil B, B-1000 Brussels, Belgium. RP Belo, P (reprint author), EURATOM, IST Fus Assoc, Ctr Fusao Nucl, Av Rovisco Pais, P-1049001 Lisbon, Portugal. OI Belo, Paula/0000-0001-5047-4392 NR 26 TC 9 Z9 9 U1 0 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD AUG PY 2004 VL 46 IS 8 BP 1299 EP 1311 AR PII S0741-3335(04)77450-3 DI 10.1088/0741-3335/46/8/010 PG 13 WC Physics, Fluids & Plasmas SC Physics GA 850EV UT WOS:000223594900010 ER PT J AU Curry, JJ Adler, HG MacPhee, A Narayanan, S Wang, J AF Curry, JJ Adler, HG MacPhee, A Narayanan, S Wang, J TI X-ray absorption imaging of Hg vapour in a ceramic metal-halide lamp using synchrotron radiation SO PLASMA SOURCES SCIENCE & TECHNOLOGY LA English DT Article ID HIGH-PRESSURE MERCURY; ADVANCED PHOTON SOURCE; EMISSION-SPECTROSCOPY; INDUCED FLUORESCENCE; DISCHARGE LAMPS; ARC LAMP; DENSITY; PLASMA; TEMPERATURE; DISTRIBUTIONS AB The diagnostic technique of x-ray absorption imaging of Hg vapour in high-intensity discharge lamps has been extended. X-ray absorption imaging has been used previously to determine the time-averaged absolute Hg density (Curry J J, Sakai M and Lawler J E 1998 J. Appl. Phys. 84 3066). Now, using an intensified charge-coupled device detector and synchrotron radiation, time-resolved measurements have been made. Although no significant time-dependence was seen as a function of the electrical phase for an electronically ballasted lamp, real-time observations were made of the decaying Hg density during the cool-down period. The cold-spot temperature in a 150 W ceramic lamp containing Hg and rare-earth iodides decreased with a time constant of 48.4 s following arc extinction. The primary limitation to the sensitivity of these measurements has been identified, and methods for overcoming this limitation in future work are proposed. Other aspects of the technique are also discussed. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. OSRAM SYLVANIA, Beverly, MA 01915 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Curry, JJ (reprint author), Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. EM jjcurry@nist.gov NR 20 TC 5 Z9 5 U1 0 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0963-0252 J9 PLASMA SOURCES SCI T JI Plasma Sources Sci. Technol. PD AUG PY 2004 VL 13 IS 3 BP 403 EP 408 AR PII S0963-0252(04)79169-0 DI 10.1088/0963-0252/13/3/006 PG 6 WC Physics, Fluids & Plasmas SC Physics GA 850QF UT WOS:000223626800007 ER PT J AU Mori, Y Nakashima, H Baity, FW Goulding, RH Carter, MD Sparks, DO AF Mori, Y Nakashima, H Baity, FW Goulding, RH Carter, MD Sparks, DO TI High density hydrogen helicon plasma in a non-uniform magnetic field SO PLASMA SOURCES SCIENCE & TECHNOLOGY LA English DT Article ID LOWER-HYBRID RESONANCE; GASEOUS PLASMA; SIMPLE TORUS; WAVES; FREQUENCY; PROPAGATION; DISCHARGE; EXCITATION; ANTENNA; VOLUME AB A high density (similar or equal to10(19) m(-3)) hydrogen plasma has been sustained successfully in axially non-uniform static magnetic field configurations for frequencies both above and below the high density limit of the lower hybrid resonance frequency (LH-HD). Wave field measurements suggest several modes are coupling to generate these helicon plasmas. The dependence of the plasma density on the static magnetic field strength for a fixed geometry can be explained by waves, with wavelength close to the antenna length, that couple to the fundamental radial mode for frequencies below the LH-HD frequency and to the second radial mode for frequencies above the LH-HD frequency. C1 Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Fukuoka 8168580, Japan. Oak Ridge Natl Lab, Div Fus Energy, Oak Ridge, TN 37831 USA. RP Mori, Y (reprint author), Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Fukuoka 8168580, Japan. EM yositaka@aecs.kyushu-u.ac.jp RI Goulding, Richard/C-5982-2016; U-ID, Kyushu/C-5291-2016 OI Goulding, Richard/0000-0002-1776-7983; NR 43 TC 20 Z9 20 U1 1 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0963-0252 J9 PLASMA SOURCES SCI T JI Plasma Sources Sci. Technol. PD AUG PY 2004 VL 13 IS 3 BP 424 EP 435 AR PII S0963-0252(04)78554-0 DI 10.1088/0963-0252/13/3/009 PG 12 WC Physics, Fluids & Plasmas SC Physics GA 850QF UT WOS:000223626800010 ER PT J AU Mittal, R Chaplot, SL Kolesnikov, AI Loong, GK Jayakumar, OD Kulshreshtha, SK AF Mittal, R Chaplot, SL Kolesnikov, AI Loong, GK Jayakumar, OD Kulshreshtha, SK TI Inelastic neutron scattering and lattice dynamics of GaPO4 SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article; Proceedings Paper CT Conference on Neutron Scattering CY JAN 02-04, 2004 CL Bhabha Atom Res Ctr, Mumbai, INDIA SP Board Res Nucl Sci, Dept Atom Energy, Govt India HO Bhabha Atom Res Ctr DE inelastic neutron scattering; phonons; thermal expansion ID HIGH-PRESSURE; THERMAL-EXPANSION; PHASE-TRANSITION; ALPHA-ALPO4 AB We report here measurements of phonon spectrum and lattice dynamical calculations for GaPO4. The measurements in low-cristobalite phase of GaPO4 are carried out using high-resolution medium-energy chopper spectrometer at ANL, USA in the energy transfer range 0-160 meV. Semiempirical interatomic potential in GaPO4, previously determined using ab-initio calculations have been widely used in studying the phase transitions among various polymorphs. The calculated phonon spectrum using the available potential show fair agreement with the experimental data. However, the agreement between the two is improved by including the polarisability of the oxygen atoms in the framework of the shell model. The lattice dynamical models are also exploited for calculations of various thermodynamic properties of GaPO4. C1 Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India. Bhabha Atom Res Ctr, Novel Mat & Struct Chem Div, Bombay 400085, Maharashtra, India. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Mittal, R (reprint author), Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India. EM rmittal@apsara.barc.ernet.in RI Kolesnikov, Alexander/I-9015-2012 OI Kolesnikov, Alexander/0000-0003-1940-4649 NR 14 TC 2 Z9 2 U1 0 U2 1 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA C V RAMAN AVENUE, SADASHIVANAGAR, P B #8005, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD AUG PY 2004 VL 63 IS 2 SI SI BP 405 EP 408 DI 10.1007/BF02705006 PG 4 WC Physics, Multidisciplinary SC Physics GA 854ML UT WOS:000223907200038 ER PT J AU Kucuk, H Parker, GG Baumgartner, ET Klymyshyn, NA AF Kucuk, H Parker, GG Baumgartner, ET Klymyshyn, NA TI Desensitization of camera-aided manipulation to target specification errors SO PRESENCE-TELEOPERATORS AND VIRTUAL ENVIRONMENTS LA English DT Article ID SPACE MANIPULATION AB Applications of vision-based remotely operated robotic systems range from planetary exploration to hazardous waste remediation. For space applications, where communication time lags are large, the target selection and robot positioning tasks may be performed sequentially, differing from conventional telerobotic maneuvers. For these point-and-move systems, the desired target must be defined in the image plane of the cameras either by an operator or through image processing software. Ambiguity of the target specification will naturally lead to end-effector positioning errors. In this paper, the target specification error covariance is shown to transform linearly to the end-effector positioning error. In addition, a methodology for optimal estimation of camera-view parameters of a vision-based robotic system based on target specification errors is presented. The proposed strategy is based on minimizing the end-effector error covariance matrix. Experimental results are presented demonstrating an increase in end-effector positioning, compared to traditional view parameter estimation by up to 32%. C1 Nigde Univ, Aksaray Muhendisik Fak, TR-68100 Konya Yolu, Aksaray, Turkey. Michigan Technol Univ, Dept Mech Engn & Engn Mech, Houghton, MI 49931 USA. CALTECH, Jet Prop Lab, Mech & Robot Technol Grp, Sci & Technol Dev Sect, Pasadena, CA 91109 USA. Battelle Mem Inst, Pacific NW Lab, Richland, WA 99352 USA. RP Nigde Univ, Aksaray Muhendisik Fak, TR-68100 Konya Yolu, Aksaray, Turkey. EM hkucuk7@hotmail.com; ggparker@mtu.edu; eric.t.baumgartner@jpl.nasa.gov; nicholas.klymyshyn@pnl.gov NR 12 TC 0 Z9 0 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA ONE ROGERS ST, CAMBRIDGE, MA 02142-1209 USA SN 1054-7460 EI 1531-3263 J9 PRESENCE-TELEOP VIRT JI Presence-Teleoper. Virtual Env. PD AUG PY 2004 VL 13 IS 4 BP 385 EP 394 DI 10.1162/1054746041944795 PG 10 WC Computer Science, Cybernetics; Computer Science, Software Engineering SC Computer Science GA 855LT UT WOS:000223975500001 ER PT J AU Dyer, JR Peters, MT AF Dyer, JR Peters, MT TI Progress in permanent geologic disposal of spent nuclear fuel and high-level radioactive waste in the United States SO PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY LA English DT Article DE geologic disposal; Yucca Mountain; Nevada; exploratory studies facility AB The mission of the Office of Civilian Radioactive Waste Management (OCRWM) of the US Department of Energy (DOE) is to manage and dispose of spent nuclear fuel and high-level radioactive waste in a manner that protects health, safety and the environment, enhances national and energy security and merits public confidence. Consolidation of spent nuclear fuel and high-level radioactive waste from 126 sites in 39 states and safe disposal at Yucca Mountain are vital to the US national interests. The US geologic repository programme's key objective remains to begin receiving spent nuclear fuel and high-level radioactive waste at the US Nuclear Regulatory Commission (NRC) licensed Yucca Mountain repository in 2010. To achieve this objective, the DOE must, in less than 7 years, seek and secure authorization to construct the repository from the NRC, begin constructing the repository and receive a license amendment allowing receipt of radioactive materials and operation of the repository. DOE must also develop a transportation system to ship spent nuclear fuel and high-level radioactive waste from civilian and defence storage sites to the repository. This paper describes near-term efforts in developing the license application and transportation system. Successfully licensing, constructing and operating a repository will rely on information gained from more than two decades of scientific investigations at the Yucca Mountain site, all of which contribute to the technical basis for understanding the repository system. This paper also summarizes ongoing and completed in situ testing in the exploratory studies facility (ESF) and cross-drift. The ESF, a U-shaped tunnel approximately 7.9 km long and about 300 m below the crest of Yucca Mountain, has been used extensively to conduct tests in 13 alcoves and niches and to access a smaller cross-drift, 5 m in diameter and 2.7 km long. C1 US DOE, Off Repository Dev, Off Civilian Radioact Waste Management, Las Vegas, NV 89134 USA. Los Alamos Natl Lab, Washington, DC USA. RP Dyer, JR (reprint author), US DOE, Off Repository Dev, Off Civilian Radioact Waste Management, 1551 Hillshire Dr, Las Vegas, NV 89134 USA. NR 1 TC 4 Z9 4 U1 1 U2 7 PU PROFESSIONAL ENGINEERING PUBLISHING LTD PI BURY ST EDMUNDS PA NORTHGATE AVENUE, BURY ST EDMUNDS IP32 6BW, SUFFOLK, ENGLAND SN 0957-6509 J9 P I MECH ENG A-J POW JI Proc. Inst. Mech. Eng. Part A-J. Power Energy PD AUG PY 2004 VL 218 IS A5 BP 319 EP 334 DI 10.1243/0957650041562253 PG 16 WC Engineering, Mechanical SC Engineering GA 850QI UT WOS:000223627100006 ER PT J AU Rawers, JC AF Rawers, JC TI Characterizing alloy additions to carbon high-nitrogen steel SO PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS LA English DT Article DE nitrogen; carbon; microstructure; mechanical properties; corrosion; wear ID AUSTENITIC STEELS; STAINLESS-STEELS; NICKEL; TEMPERATURE AB Alloy compositions are designed for specific industrial needs and applications. In this study, alloying elements that are known to enhance specific material properties of commercial Fe-Cr-Ni stainless steels were found to be similarly successful when added to Fe-15Cr-15Mn stainless steels. Unique to this study is the alloy addition of both carbon and nitrogen in excess of approximately 0.4 wt%. The nitrogen and carbon remained as interstitials without the formation of nitride or carbide precipitates even in carbon and nitrogen concentrations as high as 2 wt%. Nitrogen and carbon alloying increased hardness, strength (sigma(YIELD) > 850 MPa and sigma(MAX) > 2 GPa), toughness and wear resistance. Precipitate formers such as niobium and solid solution additives such as silicon and molybdenum enhanced sigma(YIELD) but to a much smaller extent than interstitial alloying. Additions of silicon and molybdenum significantly improved oxidation protection at all temperatures and are necessary to prevent spallation at temperatures above 800 K. In corrosion tests, alloys form a passive region, but small concentrations of nickel are necessary to ensure repassivation. C1 US DOE, Albany Res Ctr, Albany, OR 97321 USA. RP Rawers, JC (reprint author), US DOE, Albany Res Ctr, 1450 Queen Ave SW, Albany, OR 97321 USA. NR 38 TC 5 Z9 6 U1 2 U2 5 PU PROFESSIONAL ENGINEERING PUBLISHING LTD PI BURY ST EDMUNDS PA NORTHGATE AVENUE, BURY ST EDMUNDS IP32 6BW, SUFFOLK, ENGLAND SN 1464-4207 J9 P I MECH ENG L-J MAT JI Proc. Inst. Mech. Eng. Pt. L-J. Mater.-Design Appl. PD AUG PY 2004 VL 218 IS L3 BP 239 EP 246 DI 10.1243/1464420041579526 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA 850PY UT WOS:000223626100008 ER PT J AU Green, MA Emery, K King, DL Igari, S Warta, W AF Green, MA Emery, K King, DL Igari, S Warta, W TI Solar cell efficiency tables (Version 24) SO PROGRESS IN PHOTOVOLTAICS LA English DT Article DE solar cell efficiency; photovoltaic efficiency; energy conversion efficiency AB Consolidated tables showing an extensive listing of the highest independently confirmed efficiencies for solar cells and modules are presented. Guidelines for inclusion of results into these tables are outlined and new entries since January 2004 are reviewed. Copyright (C) 2004 John Wiley Sons, Ltd. C1 Univ New S Wales, Ctr Photovoltaic Engn, Sydney, NSW 2052, Australia. Natl Renewable Energy Lab, Golden, CO 80401 USA. Sandia Natl Labs, Albuquerque, NM 87123 USA. Natl Inst Adv Ind Sci & Technol, Energy Elect Inst, Tsukuba, Ibaraki, Japan. Fraunhofer Inst Solar Energy Syst, Dept Solar Cells Mat & Technol, D-79110 Freiburg, Germany. RP Green, MA (reprint author), Univ New S Wales, Ctr Photovoltaic Engn, Sydney, NSW 2052, Australia. EM m.green@unsw.edu.au NR 46 TC 27 Z9 28 U1 3 U2 12 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 1062-7995 J9 PROG PHOTOVOLTAICS JI Prog. Photovoltaics PD AUG PY 2004 VL 12 IS 5 BP 365 EP 372 DI 10.1002/pip.574 PG 8 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 843MQ UT WOS:000223088400005 ER PT J AU Thiel, PA AF Thiel, PA TI An introduction to the surface science of quasicrystals SO PROGRESS IN SURFACE SCIENCE LA English DT Editorial Material ID SCANNING-TUNNELING-MICROSCOPY; TERNARY MELT; SINGLE-GRAIN; CZOCHRALSKI METHOD; TRANSLATIONAL SYMMETRY; ELECTRONIC-STRUCTURE; ICOSAHEDRAL PHASE; ATOMIC-STRUCTURE; AL; GROWTH C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Thiel, PA (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. EM thiel@ameslab.gov NR 97 TC 19 Z9 20 U1 0 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD AUG PY 2004 VL 75 IS 3-8 BP 69 EP 86 DI 10.1016/j.progsurf.2004.05.012 PG 18 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 848AR UT WOS:000223439900001 ER PT J AU Jenks, CJ Bastasz, R AF Jenks, CJ Bastasz, R TI Probing the surface structure of quasicrystals via angle-resolved low-energy ion scattering SO PROGRESS IN SURFACE SCIENCE LA English DT Review ID ELECTRON DIFFRACTION; SENSITIVITY FACTORS; ICOSAHEDRAL PHASE; FIVEFOLD SURFACE; AL70PD21MN9; ALPDMN AB Angle-resolved low-energy ion scattering is a valuable technique for examining the topmost surface layers of materials. Using this technique, information about both composition and structure can be obtained. We discuss the physical basis of this technique and present our findings for the fivefold surface of icosahedral (i-) Al-Pd-Mn. Our results clearly show that the exposed surface has a higher Al content than the bulk and can have fivefold periodicity. Information about frequently occurring interatomic distances on the surface can also be obtained by this technique. We discuss the results and compare them to recent scanning tunneling microscopy studies and to bulk structure models. (C) 2004 Published by Elsevier Ltd. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Sandia Natl Labs, Livermore, CA 94551 USA. RP Jenks, CJ (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. EM cjenks@iastate.edu NR 20 TC 3 Z9 3 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD AUG PY 2004 VL 75 IS 3-8 BP 147 EP 160 DI 10.1016/j.progsurf.2004.05.008 PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 848AR UT WOS:000223439900005 ER PT J AU Thiel, PA AF Thiel, PA TI Structure and oxidation at quasicrystal surfaces SO PROGRESS IN SURFACE SCIENCE LA English DT Review ID AL-PD-MN; ENERGY-ELECTRON-DIFFRACTION; SCANNING-TUNNELING-MICROSCOPY; THIN-FILMS; SYMMETRY ELEMENTS; DYNAMICAL LEED; SINGLE-GRAIN; ALPDMN; AL68PD23MN9; ALLOY AB We have investigated the atomic and electronic structure, chemical composition, and oxidation characteristics of the surfaces of icosahedral, Al-rich quasicrystals, using a variety of surface-sensitive techniques (LEED, XPS, STM, AES). We have systematically investigated the way, that,these traits vary with preparation conditions (e.g. sputtering and then annealing to various temperatures, vs. fracture), with surface symmetry (e.g. 2f vs. 3f vs. 5f surfaces), and with bulk composition (e.g. i-Al-Pd-Mn vs. i-Al-Cu-Fe). We have also compared our results for the quasicrystals with results for crystalline. approximants and. other related crystalline phases. Our main conclusions are that, under specific conditions of sputter-annealing, the bulk atomic and electronic structures of the clean quasicrystal propagate to the surface. Also, the oxidation chemistry is dominated by that of the primary constituent, aluminum. (C) 2004 Published by Elsevier Ltd. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Thiel, PA (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. EM thiel@ameslab.gov NR 72 TC 11 Z9 11 U1 2 U2 19 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD AUG PY 2004 VL 75 IS 3-8 BP 191 EP 204 DI 10.1016/j.progsurf.2004.05.005 PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 848AR UT WOS:000223439900008 ER PT J AU Rotenberg, E Theis, W Horn, K AF Rotenberg, E Theis, W Horn, K TI Electronic structure investigations of quasicrystals SO PROGRESS IN SURFACE SCIENCE LA English DT Review ID DENSITY-OF-STATES; RESOLVED PHOTOEMISSION; TRANSPORT-PROPERTIES; SURFACE; ALLOYS; MODEL AB We present a review of the determination of density of states (DOS) of quasicrystals using valence band photoemission spectroscopy. The absence of fine or spiky structure in the angle-integrated DOS of quasicrystals suggests the possibility of delocalized electronic states. These were confirmed with angle-resolved photoemission studies, which clearly establish the presence of dispersing features attributed to momentum-dependent bandstructure. Such dispersing states are observed not only for deeper-lying sp states, but also for d-derived bands near the Fermi level. Data from three different high symmetry surfaces of decagonal Al-Ni-Co, an ideal model system, are presented. We find that only a few dominant reciprocal lattice vectors are sufficient to describe the quasiperiodic potential, and the implications for electronic properties are discussed. (C) 2004 Elsevier Ltd. All rights reserved. C1 Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany. Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany. RP Rotenberg, E (reprint author), Lawrence Berkeley Lab, Adv Light Source, MS 6-2100, Berkeley, CA 94720 USA. EM erotenberg@lbl.gov RI Rotenberg, Eli/B-3700-2009 OI Rotenberg, Eli/0000-0002-3979-8844 NR 31 TC 4 Z9 4 U1 0 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD AUG PY 2004 VL 75 IS 3-8 BP 237 EP 253 DI 10.1016/j.progsurf.2004.05.002 PG 17 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 848AR UT WOS:000223439900011 ER PT J AU Chavez, DE Hiskey, MA Naud, DL AF Chavez, DE Hiskey, MA Naud, DL TI Tetrazine explosives SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article DE synthesis; explosives; tetrazines ID 3,3'-AZOBIS(6-AMINO-1,2,4,5-TETRAZINE) AB The synthesis and properties of various 1,2,4,5-tetrazine explosives and energetic materials are described. These are the nitrate and perchlorate salts of 3,6-diguanidino-1,2,4,5-tetrazine, the nitrate and perchlorate salts of 3,6-diguanidino-1,2,4,5-tetrazine-1.4-di-N-oxide, 3,6-bis(1H-1,2,3,4-tetrazol-5-ylamino)-1,2,4,5-tetrazine and its 1,4-di-N-oxide derivative, 3,3'-azobis(6-amino-1,2,4,5-tetrazine) and its oxidation products. C1 Los Alamos Natl Lab, High Explos Sci & Technol, Los Alamos, NM 87545 USA. RP Chavez, DE (reprint author), Los Alamos Natl Lab, High Explos Sci & Technol, POB 1663, Los Alamos, NM 87545 USA. EM dechavez@dx-mail.lanl.gov NR 12 TC 113 Z9 132 U1 4 U2 24 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD AUG PY 2004 VL 29 IS 4 BP 209 EP 215 DI 10.1002/prep.200400050 PG 7 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA 851OI UT WOS:000223694000002 ER PT J AU Asay, BW Son, SE Busse, JR Oschwald, DM AF Asay, BW Son, SE Busse, JR Oschwald, DM TI Ignition characteristics of metastable intermolecular composites SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article AB Metastable Intermolecular Composite (MIC) materials are comprised of a mixture of oxidizer and fuel with particle sizes in the nanometer range. They are a subclass of materials known as thermites. The mechanism responsible for the propagation of reaction in loose compacts is not well understood. We have conducted a series of experiments using high-speed photography and pressure transducers in an attempt to identify the dominant mechanism. We studied a mixture of aluminum and molybdenum trioxide. Of the four possible candidates (radiation, convection, conduction, and acoustic/compaction), these preliminary studies identify convection as the most likely. However, the extent of contribution of the other modes is not yet known and this will receive further study. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Asay, BW (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM bwa@lanl.gov OI Son, Steven/0000-0001-7498-2922 NR 5 TC 51 Z9 55 U1 2 U2 20 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD AUG PY 2004 VL 29 IS 4 BP 216 EP 219 DI 10.1002/prep.200400049 PG 4 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA 851OI UT WOS:000223694000003 ER PT J AU Zhang, YB Howitt, J McCorkle, S Lawrence, P Springer, K Freimuth, P AF Zhang, YB Howitt, J McCorkle, S Lawrence, P Springer, K Freimuth, P TI Protein aggregation during overexpression limited by peptide extensions with large net negative charge SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article DE fusion protein; aggregation; protein folding; electrostatic repulsion ID MALTOSE-BINDING PROTEIN; COXSACKIE-ADENOVIRUS RECEPTOR; ESCHERICHIA-COLI; IMMUNOGLOBULIN SUPERFAMILY; EXTRACELLULAR DOMAIN; FUSION PROTEINS; EXPRESSION; SOLUBILITY; SURFACE; POLYPEPTIDES AB Folding of the human coxsackie and adenovirus receptor immunoglobulin (Ig) variable-type domain (CAR D1) during overexpression in the Escherichia coli cytoplasm was shown previously to be partially rescued by fusion to a 22-residue C-terminal peptide. Here, peptide sequence features required for solubilization and folding of CAR D1 and similar Ig variable-type domains from two other human membrane proteins were investigated. Peptide extensions with net negative charge > -6 fully solubilized CAR D1, and approximately half of the peptide-solubilized protein was correctly folded. The Ig variable-type domains from human A33 antigen and myelin P-zero proteins were only partially solubilized by peptide extensions with net charge of -12, however, and only the solubilized P-zero domain appeared to fold correctly whereas the A33 domain formed soluble microaggregates of misfolded protein. Our results suggest a model where the large net charge of peptide extensions increases electrostatic repulsion between nascent polypeptides. The resulting decrease in aggregation rate can enable some polypeptides to fold spontaneously into their native protein conformations. Analysis of the solubility and folding status of sets of structurally homologous proteins, such as the Ig variable-type domains described here, during overexpression could provide insights into how amino acid and gene sequences influence the efficiency of spontaneous protein folding. (C) 2004 Elsevier Inc. All rights reserved. C1 Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. RP Freimuth, P (reprint author), Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. EM freimuth@bnl.gov FU NIAID NIH HHS [AI36251] NR 43 TC 65 Z9 70 U1 0 U2 7 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1046-5928 J9 PROTEIN EXPRES PURIF JI Protein Expr. Purif. PD AUG PY 2004 VL 36 IS 2 BP 207 EP 216 DI 10.1016/j.pep.2004.04.020 PG 10 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 840MO UT WOS:000222863100007 PM 15249042 ER PT J AU Strader, MB Verberkmoes, NC Tabb, D Connelly, HM Bruce, BD Pelletier, DA Davison, BH Hettich, RL Larimer, FW Hurst, GB AF Strader, MB Verberkmoes, NC Tabb, D Connelly, HM Bruce, BD Pelletier, DA Davison, BH Hettich, RL Larimer, FW Hurst, GB TI Characterization of the 70S ribosome from Rhodopseudomonas palustris using an integrated "top-down" and "bottom-up" mass spectrometric approach SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. Univ Tennessee, Oak Ridge Natl Lab, Grad Sch Genome Sci & Technol, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN USA. Univ Tennessee, Biochem Cellular & Mol Biol Dept, Knoxville, TN USA. RI Pelletier, Dale/F-4154-2011; Davison, Brian/D-7617-2013; Hettich, Robert/N-1458-2016 OI Davison, Brian/0000-0002-7408-3609; Hettich, Robert/0000-0001-7708-786X NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 59 BP 69 EP 69 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100060 ER PT J AU Lightstone, FC Cosman, M Zemla, A Balhorn, R DeNardo, GL AF Lightstone, FC Cosman, M Zemla, A Balhorn, R DeNardo, GL TI Computational modeling and experimental validation of compounds that bind to HLA-DR10 SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA USA. Lawrence Livermore Natl Lab, Computat Directorate, Livermore, CA USA. Univ Calif Davis, Med Ctr, Dept Internal Med, Sacramento, CA 95817 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 71 BP 73 EP 73 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100072 ER PT J AU Bennion, BJ Kulp, KS Lightstone, FC Knize, MG Montgomery, JL Bennett, LM Felton, JS AF Bennion, BJ Kulp, KS Lightstone, FC Knize, MG Montgomery, JL Bennett, LM Felton, JS TI Dietary constituents affect receptor activation and cell proliferation in human breast cancer cells SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA USA. NCI, Bethesda, MD 20892 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 73 BP 74 EP 74 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100074 ER PT J AU Hettich, RL Ataman, D Sharp, J AF Hettich, RL Ataman, D Sharp, J TI Protein surface mapping by mass spectrometry to monitor pH-dependent structural changes SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. NIEHS, Res Triangle Pk, NC 27709 USA. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 120 BP 90 EP 90 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100121 ER PT J AU Nguyen, RT Chepanoske, C VerBerkmoes, N Strader, MB Gross, L Mu, N AF Nguyen, RT Chepanoske, C VerBerkmoes, N Strader, MB Gross, L Mu, N TI A novel monomeric C-18 bonded phase for improved resolution and sensitivity in LC-MS/MS analysis of peptides SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Grace Vydac, Applicat, Hesperia, CA USA. Prolexys Pharmaceut, Salt Lake City, UT USA. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. Univ Calif San Diego, Howard Hughes Med Inst, San Diego, CA 92103 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 226 BP 124 EP 124 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100227 ER PT J AU VerBerkmoes, NC Lankford, P Strader, MB Tabb, DL Hauser, L Pelletier, D Hurst, GB Tabita, RF Hettich, RL Larimer, FW AF VerBerkmoes, NC Lankford, P Strader, MB Tabb, DL Hauser, L Pelletier, D Hurst, GB Tabita, RF Hettich, RL Larimer, FW TI Baseline proteome analysis of the anoxygenic phototrophic bacterium Rhodopseudomonas palustris under all major metabolic states SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. Ohio State Univ, Columbus, OH 43210 USA. RI Hauser, Loren/H-3881-2012; Hettich, Robert/N-1458-2016; OI Hettich, Robert/0000-0001-7708-786X; Pelletier, Dale/0000-0002-4321-7918 NR 0 TC 1 Z9 1 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 231 BP 126 EP 126 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100232 ER PT J AU Urbauer, JL Asokan, A Bartlett, RK Smallwood, HS Squier, TC Urbauer, RJB AF Urbauer, JL Asokan, A Bartlett, RK Smallwood, HS Squier, TC Urbauer, RJB TI Regulating calmodulin function by oxidation SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Univ Georgia, Athens, GA 30602 USA. Univ Texas, Houston, TX USA. Pacific NW Natl Lab, Div Biol Sci, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 265 BP 137 EP 137 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100266 ER PT J AU Camarero, JA Tran, A Kwon, Y Maxwell, R AF Camarero, JA Tran, A Kwon, Y Maxwell, R TI Biosysnthesis of the cyclotide kalata B1 using protein splicing SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Lawrence Livermore Natl Lab, Chem Biol Div, Livermore, CA USA. RI Camarero, Julio/A-9628-2015 NR 0 TC 1 Z9 1 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 273 BP 139 EP 139 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100274 ER PT J AU Sanishvili, R Fischetti, RF Stepanov, S Smith, WW Makarov, OA Xu, S Urakhchin, A Benn, R Smith, JL AF Sanishvili, R Fischetti, RF Stepanov, S Smith, WW Makarov, OA Xu, S Urakhchin, A Benn, R Smith, JL TI New GM/CA-CAT facility for macromolecular crystallography at Advanced Photon Source SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA. Purdue Univ, Dept Biol, W Lafayette, IN 47907 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 275 BP 140 EP 140 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100276 ER PT J AU Wilton, R Saxena, P Stevens, FJ AF Wilton, R Saxena, P Stevens, FJ TI Expression, purification, and biochemical characterization of human receptor for advanced glycation endproducts (RAGE) from Escherichia coli SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Argonne Natl Lab, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 329 BP 158 EP 158 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100330 ER PT J AU Jacob, J Krantz, BA Dothager, RS Thiyagarajan, P Sosnick, TR AF Jacob, J Krantz, BA Dothager, RS Thiyagarajan, P Sosnick, TR TI Early collapse is not an obligatory step in protein folding SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Amgen Inc, Thousand Oaks, CA 91320 USA. Univ Chicago, Inst Biophys Dynam, Chicago, IL 60637 USA. Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 3 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 381 BP 175 EP 175 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100382 ER PT J AU Schafer, J Souza, B Lekin, TP Toppani, D Skowronek, KJ Coleman, M Segelke, BW AF Schafer, J Souza, B Lekin, TP Toppani, D Skowronek, KJ Coleman, M Segelke, BW TI Pathogen structural and functional genomics at the Lawrence Livermore National Laboratory SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA USA. Int Inst Mol & Cell Biol, Warsaw, Poland. RI Skowronek, Krzysztof/G-2855-2010 OI Skowronek, Krzysztof/0000-0001-9973-7085 NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 405 BP 183 EP 183 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100406 ER PT J AU Chiu, H Wolf, G West, W van den Bedem, H Miller, MD Zhang, Z Morse, A von Delft, F Elsliger, MA Grzechnik, SK AF Chiu, H Wolf, G West, W van den Bedem, H Miller, MD Zhang, Z Morse, A von Delft, F Elsliger, MA Grzechnik, SK TI From crystals to pdb: building a high throughput crystallography pipeline for strucural genomics SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Stanford Univ, Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Scripps Res Inst, La Jolla, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 408 BP 184 EP 184 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100409 ER PT J AU Vigil, D Blumenthal, DK Heller, WT Brown, SH Taylor, SS Trewhella, J AF Vigil, D Blumenthal, DK Heller, WT Brown, SH Taylor, SS Trewhella, J TI Structural and mechanistic differences between isoforms in protein kinase A signaling SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Univ Calif San Diego, San Diego, CA 92103 USA. Univ Utah, Salt Lake City, UT USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. Los Alamos Natl Lab, Biosci Div, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 455 BP 200 EP 200 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100456 ER PT J AU Camarero, JA Kwon, Y Coleman, MA AF Camarero, JA Kwon, Y Coleman, MA TI Site-specific attachment of proteins to surfaces by native chemical ligation SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Lawrence Livermore Natl Lab, Chem Biol Div, Livermore, CA USA. Lawrence Livermore Natl Lab, Biol & Biotechnol Program, Livermore, CA USA. RI Camarero, Julio/A-9628-2015 NR 0 TC 0 Z9 0 U1 0 U2 1 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 484 BP 209 EP 209 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100485 ER PT J AU Bilsel, O Kondrashkina, E Wu, Y Kayatekin, C Irving, T Matthews, CR AF Bilsel, O Kondrashkina, E Wu, Y Kayatekin, C Irving, T Matthews, CR TI Rapid collapse of a TIM barrel protein monitored by microsecond continuous-flow SAXS SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc ID TRYPTOPHAN SYNTHASE; ALPHA-SUBUNIT C1 UMass Med Sch, Worcester, MA USA. Argonne Natl Lab, Adv Photon Source, BioCAT, Argonne, IL 60439 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 536 BP 225 EP 225 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100537 ER PT J AU Kaufmann, M Strong, M Wang, H Chan, S Perry, J Eisenberg, D AF Kaufmann, M Strong, M Wang, H Chan, S Perry, J Eisenberg, D TI A structural Genomics approach to study protein interactions in Mycobacterium tuberculosis SO PROTEIN SCIENCE LA English DT Meeting Abstract CT 18th Symposium of the Protein-Society CY AUG 14-18, 2004 CL San Diego, CA SP Protein Soc, Abbott Lab Fund, Amer Peptide Soc, Amgen, Biogen Idec, DARPA, Eli Lilly & Co, Eli Lilly Res Labs, Biotechnol Discovery Res, Genencor Int, Genentech Inc, Merck Res Labs, Natl Sci Fdn, NIH, New England BioLabs, Novartis Inst Biomed Res, Pfizer Inc, Protein Soc Educ Comm, Protein Soc Young Protein Sci Comm, Roche Pharmaceut, Sunesis Pharmaceut Inc C1 Univ Calif Los Angeles, UCLA DOE Inst Genom & Proteom, Los Angeles, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 SU 1 MA 580 BP 240 EP 240 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 866TL UT WOS:000224796100581 ER PT J AU Chamberlain, AK Bowie, JU AF Chamberlain, AK Bowie, JU TI Asymmetric amino acid compositions of transmembrane beta-strands SO PROTEIN SCIENCE LA English DT Article DE beta barrel; membrane protein; snorkeling; membrane polarity; protein structure; genome ID BARREL MEMBRANE-PROTEIN; IDENTIFICATION; PREFERENCES; HELICES; PORINS AB In contrast to water-soluble proteins, membrane proteins reside in a heterogeneous environment, and their surfaces must interact with both polar and apolar membrane regions. As a consequence, the composition of membrane proteins' residues varies substantially between the membrane core and the interfacial regions. The amino acid compositions of helical membrane proteins are also known to be different on the cytoplasmic and extracellular sides of the membrane. Here we report that in the 16 transmembrane beta-barrel structures, the amino acid compositions of lipid-facing residues are different near the N and C termini of the individual strands. Polar amino acids are more prevalent near the C termini than near the N termini, and hydrophobic amino acids show the opposite trend. We suggest that this difference arises because it is easier for polar atoms to escape from the apolar regions of the bilayer at the C terminus of a beta-strand. This new characteristic of beta-barrel membrane proteins enhances our understanding of how a sequence encodes a membrane protein structure and should prove useful in identifying and predicting the structures of transmembrane beta-barrels. C1 Univ Calif Los Angeles, DOE Ctr Genom & Proteom, Inst Mol Biol, Dept Chem & Biochem, Los Angeles, CA 90095 USA. RP Bowie, JU (reprint author), Univ Calif Los Angeles, DOE Ctr Genom & Proteom, Inst Mol Biol, Dept Chem & Biochem, Boyer Hall,611 Charles E Young Dr E, Los Angeles, CA 90095 USA. EM bowie@mbi.ucla.edu FU NIGMS NIH HHS [R01 GM063919] NR 17 TC 12 Z9 12 U1 0 U2 3 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI WOODBURY PA 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2924 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD AUG PY 2004 VL 13 IS 8 BP 2270 EP 2274 DI 10.1110/ps.04777304 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 841KN UT WOS:000222928800028 PM 15273317 ER PT J AU Lehmann, C Doseeva, V Pullalarevu, S Krajewski, W Howard, A Herzberg, O AF Lehmann, C Doseeva, V Pullalarevu, S Krajewski, W Howard, A Herzberg, O TI YbdK is a carboxylate-amine ligase with a gamma-glutamyl: Cysteine ligase activity: Crystal structure and enzymatic assays SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article ID ESCHERICHIA-COLI; ARABIDOPSIS-THALIANA; ANGSTROM RESOLUTION; SYNTHETASE; MODEL; SITE; REFINEMENT; INHIBITION; ALIGNMENT; DATABASE AB The Escherichia coli open reading frame YbdK encodes a member of a large bacterial protein family of unknown biological function. The sequences within this family are remotely related to the sequence of gamma-glutamate-cysteine ligase (gamma-GCS), an enzyme in the glutathione biosynthetic pathway. A gene encoding gamma-GCS in E. coli is already known. The 2.15 Angstrom resolution crystal structure of YbdK reveals an overall fold similar to that of glutamine synthetase (GS), a nitrogen metabolism enzyme that ligates glutamate and ammonia to yield glutamine. GS and gamma-GCS perform related chemical reactions and require ATP and Mg2+ for their activity. The Mg2+-dependent binding of ATP to YbdK was confirmed by fluorescence spectroscopy employing 2'(or 3')-O-(trinitrophenyl)adenosine 5'-triphosphate, and yielding a dissociation constant of 3 +/- 0.5 muM. The structure of YbdK contains a crevice that corresponds to the binding sites of ATP, Mg2+ and glutamate in GS. Many of the GS residues that coordinate the metal ions and interact with glutamic acid and the phosphoryl and ribosyl groups of ATP are also present in YbdK. GS amino acids that have been associated with ammonia binding have no obvious counterparts in YbdK, consistent with a substrate specificity that is different from that of GS. Ligase activity between glutamic acid and each of the twenty amino acid residues was tested on high performance liquid chromatography (HPLC) by following the hydrolysis of ATP to ADP. Catalysis was observed only with cysteine. A pyruvate kinase/lactic acid dehydrogenase coupled assay was used to rule out GS activity and to determine that YbdK exhibits gamma-GCS activity. The catalytic rate was found to be approximately 500-fold slower than that reported for authentic gamma-GCS. (C) 2004 Wiley-Liss, Inc. C1 Univ Maryland, Maryland Biotechnol Inst, Ctr Adv Res Biotechnol, Rockville, MD 20850 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. IIT, Chicago, IL 60616 USA. RP Herzberg, O (reprint author), Univ Maryland, Maryland Biotechnol Inst, Ctr Adv Res Biotechnol, 9600 Gudelsky Dr, Rockville, MD 20850 USA. EM osnat@carb.nist.gov RI ID, IMCACAT/D-5867-2014 FU NIGMS NIH HHS [P01 GM57890] NR 33 TC 14 Z9 16 U1 0 U2 1 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 1 PY 2004 VL 56 IS 2 BP 376 EP 383 DI 10.1002/prot.20103 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 834HX UT WOS:000222403300018 PM 15211520 ER PT J AU Heine, A Canaves, JM von Delft, F Brinen, LS Dai, XP Deacon, AM Elsliger, MA Eshaghi, S Floyd, R Godzik, A Grittini, C Grzechnik, SK Guda, C Jaroszewski, L Karlak, C Klock, HE Koesema, E Kovarik, JS Kreusch, A Kuhn, P Lesley, SA McMullan, D McPhillips, TM Miller, MA Miller, MD Morse, A Moy, K Ouyang, J Page, R Robb, A Rodrigues, K Schwarzenbacher, R Selby, TL Spraggon, G Stevens, RC van den Bedem, H Velasquez, J Vincent, J Wang, XH West, B Wolf, G Hodgson, KO Wooley, J Wilson, IA AF Heine, A Canaves, JM von Delft, F Brinen, LS Dai, XP Deacon, AM Elsliger, MA Eshaghi, S Floyd, R Godzik, A Grittini, C Grzechnik, SK Guda, C Jaroszewski, L Karlak, C Klock, HE Koesema, E Kovarik, JS Kreusch, A Kuhn, P Lesley, SA McMullan, D McPhillips, TM Miller, MA Miller, MD Morse, A Moy, K Ouyang, J Page, R Robb, A Rodrigues, K Schwarzenbacher, R Selby, TL Spraggon, G Stevens, RC van den Bedem, H Velasquez, J Vincent, J Wang, XH West, B Wolf, G Hodgson, KO Wooley, J Wilson, IA TI Crystal structure of O-acetylserine sulfhydrylase (TM0665) from Thermotoga maritima at 1.8 A resolution SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article ID SALMONELLA-TYPHIMURIUM; CRYSTALLOGRAPHY; SOFTWARE; SYSTEM C1 Scripps Res Inst, La Jolla, CA 92037 USA. Stanford Univ, Joint Ctr Struct Genom, Menlo Pk, CA USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA. Novartis Res Fdn, Genom Inst, San Diego, CA USA. San Diego Supercomp Ctr, La Jolla, CA USA. Univ Calif San Diego, La Jolla, CA 92093 USA. RP Wilson, IA (reprint author), Scripps Res Inst, BCC206,10550 N Torrey Pines Rd, La Jolla, CA 92037 USA. EM wilson@scripps.edu RI Godzik, Adam/A-7279-2009; Stevens, Raymond/K-7272-2015 OI Godzik, Adam/0000-0002-2425-852X; Stevens, Raymond/0000-0002-4522-8725 FU NIGMS NIH HHS [P50 GM62411] NR 15 TC 13 Z9 13 U1 0 U2 5 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 1 PY 2004 VL 56 IS 2 BP 387 EP 391 DI 10.1002/prot.20003 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 834HX UT WOS:000222403300020 PM 15211522 ER PT J AU Schwarzenbacher, R von Delft, F Jaroszewski, L Abdubek, P Ambing, E Biorac, T Brinen, L Canaves, JM Cambell, J Chiu, HJ Dai, XP Deacon, AM DiDonato, M Elsliger, MA Eshagi, S Floyd, R Godzik, A Grittini, C Grzechnik, SK Hampton, E Karlak, C Klock, HE Koesema, E Kovarik, JS Kreusch, A Kuhn, P Lesley, SA Levin, I McMullan, D McPhillips, TM Miller, MD Morse, A Moy, K Ouyang, J Page, R Quijano, K Robb, A Spraggon, G Stevens, RC van den Bedem, H Velasquez, J Vincent, J Wang, XH West, B Wolf, G Xu, QP Hodgson, KO Wooley, J Wilson, IA AF Schwarzenbacher, R von Delft, F Jaroszewski, L Abdubek, P Ambing, E Biorac, T Brinen, L Canaves, JM Cambell, J Chiu, HJ Dai, XP Deacon, AM DiDonato, M Elsliger, MA Eshagi, S Floyd, R Godzik, A Grittini, C Grzechnik, SK Hampton, E Karlak, C Klock, HE Koesema, E Kovarik, JS Kreusch, A Kuhn, P Lesley, SA Levin, I McMullan, D McPhillips, TM Miller, MD Morse, A Moy, K Ouyang, J Page, R Quijano, K Robb, A Spraggon, G Stevens, RC van den Bedem, H Velasquez, J Vincent, J Wang, XH West, B Wolf, G Xu, QP Hodgson, KO Wooley, J Wilson, IA TI Crystal structure of a putative oxalate decarboxylase (TM1287) from Thermotoga maritima at 1.95 A resolution SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article ID MACROMOLECULAR CRYSTALLOGRAPHY; ELECTRON-DENSITY; PROTEINS; PROGRAM C1 Scripps Res Inst, Joint Ctr Struct Genom, La Jolla, CA 92037 USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA. Novartis Res Fdn, Genom Inst, San Diego, CA USA. San Diego Supercomp Ctr, La Jolla, CA USA. Univ Calif San Diego, La Jolla, CA 92093 USA. RP Wilson, IA (reprint author), Scripps Res Inst, Joint Ctr Struct Genom, BCC206,10550 N Torrey Pines Rd, La Jolla, CA 92037 USA. EM wilson@scripps.edu RI Godzik, Adam/A-7279-2009; Stevens, Raymond/K-7272-2015; OI Godzik, Adam/0000-0002-2425-852X; Stevens, Raymond/0000-0002-4522-8725; van den Bedem, Henry/0000-0003-2358-841X FU NIGMS NIH HHS [P50-GM 62411] NR 17 TC 15 Z9 17 U1 0 U2 20 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 1 PY 2004 VL 56 IS 2 BP 392 EP 395 DI 10.1002/prot.20016 PG 4 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 834HX UT WOS:000222403300021 PM 15211523 ER PT J AU Spraggon, G Schwarzenbacher, R Kreusch, A McMullan, D Brinen, LS Canaves, JM Dai, XP Deacon, AM Elsliger, MA Eshagi, S Floyd, R Godzik, A Grittini, C Grzechnik, SK Jaroszewski, L Karlak, C Klock, HE Koesema, E Kovarik, JS Kuhn, P McPhillips, TM Miller, MD Morse, A Moy, K Ouyang, J Page, R Quijano, K Rezezadeh, F Robb, A Sims, E Stevens, RC van den Bedem, H Velasquez, J Vincent, J von Delft, F Wang, XH West, B Wolf, G Xu, QP Hodgson, KO Wooley, J Lesley, SA Wilson, IA AF Spraggon, G Schwarzenbacher, R Kreusch, A McMullan, D Brinen, LS Canaves, JM Dai, XP Deacon, AM Elsliger, MA Eshagi, S Floyd, R Godzik, A Grittini, C Grzechnik, SK Jaroszewski, L Karlak, C Klock, HE Koesema, E Kovarik, JS Kuhn, P McPhillips, TM Miller, MD Morse, A Moy, K Ouyang, J Page, R Quijano, K Rezezadeh, F Robb, A Sims, E Stevens, RC van den Bedem, H Velasquez, J Vincent, J von Delft, F Wang, XH West, B Wolf, G Xu, QP Hodgson, KO Wooley, J Lesley, SA Wilson, IA TI Crystal structure of a methionine aminopeptidase (TM1478) from Thermotoga maritima at 1.9 A resolution SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article C1 Scripps Res Inst, Joint Ctr Struct Genom, La Jolla, CA 92037 USA. Stanford Univ, Joint Ctr Struct Genom, Menlo Pk, CA USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA. Novartis Res Fdn, Genom Inst, San Diego, CA USA. San Diego Supercomp Ctr, La Jolla, CA USA. Univ Calif San Diego, La Jolla, CA 92093 USA. RP Wilson, IA (reprint author), Scripps Res Inst, Joint Ctr Struct Genom, BCC206,10550 N Torrey Pines Rd, La Jolla, CA 92037 USA. EM wilson@scripps.edu RI Godzik, Adam/A-7279-2009; Stevens, Raymond/K-7272-2015; OI Godzik, Adam/0000-0002-2425-852X; Stevens, Raymond/0000-0002-4522-8725; van den Bedem, Henry/0000-0003-2358-841X FU NIGMS NIH HHS [P50 GM62411] NR 12 TC 9 Z9 9 U1 0 U2 5 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 1 PY 2004 VL 56 IS 2 BP 396 EP 400 DI 10.1002/prot.20084 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 834HX UT WOS:000222403300022 PM 15211524 ER PT J AU Levin, I Schwarzenbacher, R Page, R Abdubek, P Ambing, E Biorac, T Brinen, LS Campbell, J Canaves, JM Chiu, HJ Dai, XP Deacon, AM DiDonato, M Elsliger, MA Floyd, R Godzik, A Grittini, C Grzechnik, SK Hampton, E Jaroszewski, L Karlak, C Klock, HE Koesema, E Kovarik, JS Kreusch, A Kuhn, P Lesley, SA McMullan, D McPhillips, TM Miller, MD Morse, A Moy, K Uyang, J Quijano, K Reyes, R Rezezadeh, F Robb, A Sims, E Spraggon, G Stevens, RC van den Bedem, H Velasquez, J Vincent, J von Delft, F Wang, XH West, B Wolf, G Xu, QP Hodgson, KO Wooley, J Wilson, IA AF Levin, I Schwarzenbacher, R Page, R Abdubek, P Ambing, E Biorac, T Brinen, LS Campbell, J Canaves, JM Chiu, HJ Dai, XP Deacon, AM DiDonato, M Elsliger, MA Floyd, R Godzik, A Grittini, C Grzechnik, SK Hampton, E Jaroszewski, L Karlak, C Klock, HE Koesema, E Kovarik, JS Kreusch, A Kuhn, P Lesley, SA McMullan, D McPhillips, TM Miller, MD Morse, A Moy, K Uyang, J Quijano, K Reyes, R Rezezadeh, F Robb, A Sims, E Spraggon, G Stevens, RC van den Bedem, H Velasquez, J Vincent, J von Delft, F Wang, XH West, B Wolf, G Xu, QP Hodgson, KO Wooley, J Wilson, IA TI Crystal structure of a PIN (PilT N-terminus) domain (AF0591) from Archaeoglobus fulgidus at 1.90 A resolution SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article ID ELECTRON-DENSITY; DATABASE; GENOMICS C1 Scripps Res Inst, Joint Ctr Struct Genom, La Jolla, CA 92037 USA. Stanford Univ, Joint Ctr Struct Genom, Menlo Pk, CA USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA. Novartis Res Fdn, Genom Inst, San Diego, CA USA. San Diego Supercomp Ctr, La Jolla, CA USA. Univ Calif San Diego, La Jolla, CA 92093 USA. RP Wilson, IA (reprint author), Scripps Res Inst, Joint Ctr Struct Genom, BCC206,10550 N Torrey Pines Rd, La Jolla, CA 92037 USA. EM wilson@scripps.edu RI Godzik, Adam/A-7279-2009; Stevens, Raymond/K-7272-2015; OI Godzik, Adam/0000-0002-2425-852X; Stevens, Raymond/0000-0002-4522-8725; van den Bedem, Henry/0000-0003-2358-841X FU NIGMS NIH HHS [P50 GM62411] NR 21 TC 19 Z9 20 U1 0 U2 17 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 1 PY 2004 VL 56 IS 2 BP 404 EP 408 DI 10.1002/prot.20090 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 834HX UT WOS:000222403300024 PM 15211526 ER PT J AU Sheldon, KE Anderson-Cook, CM O'Brien, WF AF Sheldon, KE Anderson-Cook, CM O'Brien, WF TI Using computer modeling to optimize cost and maintain performance constraints for the production of aircraft turbine engines SO QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL LA English DT Article; Proceedings Paper CT 3rd International Conference of the European-Network-of-Business-and-Industrial-Statisticians CY AUG, 2003 CL Barcelona, SPAIN SP European Network Business & Ind Statisticians DE simulation; variance modeling; 3-sigma pass rates; statistical modeling AB The use of computer models and simulation can be an effective way of gaining valuable information about a variety of engineering systems. In this paper, quadratic polynomial models are used to estimate gas turbine engine performance models in an extensive simulation. The goal of the simulation is maximize the tolerances on a number of engine design features, while still producing an engine that will have an overall 3-sigma (99.74%) pass rate on a number of geometric and performance constraints. The tolerances are maximized by using an optimization routine to determine the greatest allowable standard deviations (all with equal weights) and thus help to reduce engine-manufacturing cost. Details are provided about how the models and simulation were constructed, as well as how information about the system was extracted from simulation results. A comparison of current production guidelines is made with those suggested by the study to show how system improvements can be achieved. Copyright (C) 2004 John Wiley Sons, Ltd. C1 Los Alamos Natl Lab, Stat Sci Grp, Los Alamos, NM 87545 USA. GE Corp Res & Dev, Niskayuna, NY 12065 USA. Virginia Tech, Dept Mech Engn, Blacksburg, VA 24061 USA. RP Anderson-Cook, CM (reprint author), Los Alamos Natl Lab, Stat Sci Grp, POB 1663, Los Alamos, NM 87545 USA. EM candcook@vt.edu NR 9 TC 1 Z9 1 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI CHICHESTER PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND SN 0748-8017 J9 QUAL RELIAB ENG INT JI Qual. Reliab. Eng. Int. PD AUG PY 2004 VL 20 IS 5 BP 541 EP 551 DI 10.1002/qre.665 PG 11 WC Engineering, Multidisciplinary; Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA 846HC UT WOS:000223305500014 ER PT J AU Fthenakis, VM AF Fthenakis, VM TI Life cycle impact analysis of cadmium in CdTePV production SO RENEWABLE & SUSTAINABLE ENERGY REVIEWS LA English DT Review DE cadmium emissions; photovoltaics; solar cells; cadmium telluride; life cycle analysis; emissions allocation ID PV MODULES; PHOTOVOLTAICS; HEALTH; MANAGEMENT; ISSUES; SAFETY AB This paper describes the material flows and emissions in all the life stages of CdTe PV modules, from extracting refining and purifying raw materials through the production, use, and disposal or recycling of the modules. The prime focus is on cadmium flows and cadmium emissions into the environment. This assessment also compares the cadmium environmental inventories in CdTe PV modules with those of Ni-Cd batteries and of coal fuel in power plants. Previous studies are reviewed and their findings assessed in light of new data. Published by Elsevier Ltd. C1 Brookhaven Natl Lab, Dept Environm Sci, Natl Photovolta Environm Hlth & Safety Assistance, Upton, NY 11973 USA. RP Fthenakis, VM (reprint author), Brookhaven Natl Lab, Dept Environm Sci, Natl Photovolta Environm Hlth & Safety Assistance, Upton, NY 11973 USA. EM vmf@bnl.gov NR 48 TC 92 Z9 95 U1 4 U2 47 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1364-0321 J9 RENEW SUST ENERG REV JI Renew. Sust. Energ. Rev. PD AUG PY 2004 VL 8 IS 4 BP 303 EP 334 DI 10.1016/j.rser.2003.12.001 PG 32 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 831KI UT WOS:000222192900001 ER PT J AU Wiser, R Bachrach, D Bolinger, M Golove, W AF Wiser, R Bachrach, D Bolinger, M Golove, W TI Comparing the risk profiles of renewable and natural gas-fired electricity contracts SO RENEWABLE & SUSTAINABLE ENERGY REVIEWS LA English DT Review DE risk; uncertainty; renewable energy; natural gas; electricity contracts AB Electricity policymakers, industry participants, analysts, and even consumers have become acutely aware of the ever-present risks that face the delivery of electricity. Recent instability in the electricity industry illustrates the need for thoughtful resource planning to balance the cost, reliability, and risk of electricity supply. This article evaluates the relative risk profiles of renewable and natural gas generating plants. It does so by analyzing how six different risks are allocated and, if possible, mitigated in long-term power purchase contracts, taking as a contract sample 27 agreements signed by the California Department of Water Resources in 2001. This assessment illustrates some of the significant differences between the risk profiles of natural gas-fired and renewable generation. Renewable energy contracts are shown to provide the most value relative to natural gas-fired contracts by mitigating fuel price and environmental compliance risks. Gas-fired electricity contracts typically provide better protection against short-term demand risk. When it comes to fuel supply, performance, and regulatory risks, the relative value of renewable and gas-fired contracts is ambiguous. We conclude that a better understanding of risks and risk allocation practices will help utilities, regulators, and others make more objective decisions in the future when selecting between renewable and gas-fired electricity supply. (C) 2003 Elsevier Ltd. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Nat Resources Def Counsel, San Francisco, CA 94105 USA. RP Wiser, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd,MS 90-4000, Berkeley, CA 94720 USA. EM rhwiser@lbl.gov NR 24 TC 18 Z9 18 U1 1 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1364-0321 J9 RENEW SUST ENERG REV JI Renew. Sust. Energ. Rev. PD AUG PY 2004 VL 8 IS 4 BP 335 EP 363 DI 10.1016/j.rser.2003.11.005 PG 29 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 831KI UT WOS:000222192900002 ER PT J AU Moore, DS AF Moore, DS TI Instrumentation for trace detection of high explosives SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Review ID ION-MOBILITY SPECTROMETRY; PERFORMANCE LIQUID-CHROMATOGRAPHY; TRANSFORM RAMAN-SPECTROSCOPY; SOLID-PHASE MICROEXTRACTION; FIBER-OPTIC BIOSENSOR; MICROMACHINED ELECTROPHORESIS CHIPS; SUPERCRITICAL-FLUID EXTRACTION; DISPLACEMENT FLOW IMMUNOSENSOR; IONIZATION MASS-SPECTROMETRY; FIELD SCREENING-TEST AB There is at present an urgent need for trace detection of high explosives, with applications to screening of people, packages, luggage, and vehicles. A great concern, because of recent terrorist activities, is for the development of methods that might allow detection and identification of explosives at a stand off distance. Nearly every analytical chemical method has been or is being applied to this problem. This review outlines the properties of explosives that might be utilized in detection schemes, discusses sampling issues, presents recent method developments with particular attention to detection limits, speed of analysis, and portability, and looks towards future developments. (C) 2004 American Institute of Physics. C1 Los Alamos Natl Lab, Grp DX2, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, Grp DX2, MS P952, Los Alamos, NM 87545 USA. RI Moore, David/C-8692-2013 NR 333 TC 445 Z9 450 U1 19 U2 175 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD AUG PY 2004 VL 75 IS 8 BP 2499 EP 2512 DI 10.1063/1.1771493 PG 14 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 849QQ UT WOS:000223555300001 ER PT J AU Brown, M Uran, S Law, B Marschand, L Lurio, L Kuzmenko, I Gog, T AF Brown, M Uran, S Law, B Marschand, L Lurio, L Kuzmenko, I Gog, T TI Ultra-stable oven designed for x-ray reflectometry and ellipsometry studies of liquid surfaces SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID MIXTURE; ADSORPTION AB Stable temperature control is highly desirable for reflectivity studies of binary liquid mixtures. In this article we report on the construction of an oven that possesses good temperature stability (similar to1 mK/day) and small transverse temperature gradients (<1 mK/cm). The oven has a horizontal geometry and can be used for either x-ray reflectometry or ellipsometry measurements from the liquid/vapor surfaces of such systems. Details of the oven design together with test results are provided. (C) 2004 American Institute of Physics. C1 Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA. No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. Argonne Natl Lab, Adv Photon Source, CMC CAT, Argonne, IL 60439 USA. RP Law, B (reprint author), Kansas State Univ, Dept Phys, Cardwell Hall, Manhattan, KS 66506 USA. EM bmlaw@phys.ksu.edu RI Law, Bruce/I-3605-2013 OI Law, Bruce/0000-0002-3877-8497 NR 15 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD AUG PY 2004 VL 75 IS 8 BP 2536 EP 2540 DI 10.1063/1.1771496 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 849QQ UT WOS:000223555300006 ER PT J AU Foord, ME Reisman, DB Springer, PT AF Foord, ME Reisman, DB Springer, PT TI Determining the equation-of-state isentrope in an isochoric heated plasma SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID COMPRESSION; SOLIDS AB A novel method for determining the equation-of-state (EOS) along the release isentrope in an isochoric (constant volume) heated plasma is presented. This approach is demonstrated using simulations of a solid density, 10 eV expanding Al plasma. Determining the material EOS data is validated to pressures near 80 Mbar, much higher than current isentropic compression experiments allow. Limitations at very high temperature (T(e)greater than or equal to100 eV), due to the formation of a radiative conduction layer near the rarefaction interface, are also discussed. (C) 2004 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Foord, ME (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM foord1@llnl.gov NR 16 TC 9 Z9 9 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD AUG PY 2004 VL 75 IS 8 BP 2586 EP 2589 DI 10.1063/1.1775313 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 849QQ UT WOS:000223555300015 ER PT J AU Bazhenova, TA Bardina, NV Petrova, GN Borovinskaya, MA AF Bazhenova, TA Bardina, NV Petrova, GN Borovinskaya, MA TI Effect of the potential of an external electron donor on C2H2 reduction catalyzed by the nitrogenase active center (FeMoco) isolated from the enzyme SO RUSSIAN CHEMICAL BULLETIN LA English DT Article DE iron-molybdenum cofactor; nitrogenase; acetylene reduction; metallocomplex electrocatalysis ID IRON-MOLYBDENUM COFACTOR; AZOTOBACTER-VINELANDII NITROGENASE; MOFE-PROTEIN; CRYSTALLOGRAPHIC STRUCTURE; KLEBSIELLA-PNEUMONIAE; ANGSTROM RESOLUTION; DEAE-CELLULOSE; ACETYLENE; CLUSTERS; EXTRACTION AB The effect of potential value and chemical properties of an external electron donor on C2H2 reduction catalyzed by nitrogenase active center (cluster [(mu(6)-N)Fe7MoS9 (.) homocitrate] FeMoco isolated from the enzyme) has been investigated in the presence of proton donors of different acidity. The temperature -reaction rate dependences of these reactions have been studied. It has been shown that the rate-limiting steps of the reactions differ depending on the proton donor used. When thiophenol or water are used as proton donors, and electrochemical step - the electron transfer from cathode to adsorbed catalytic cluster - has been found to be a rate-limiting one. The effective activation energy of ethane formation as a product of four-electron C2H2 reduction is found to be 1.5 times lower than that of ethylene, namely, similar to 13 kcal mol(-1). When stronger acid, pentafluorothiophenol, is used as a proton donor, the chemical step of intramolecular rearrangement of the catalyst-substrate complex taking place in solution becomes a rate-limiting one. The effective activation energies of both ethylene and ethane become equal to 32 kcal mol(-1). C1 Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Bazhenova, TA (reprint author), Russian Acad Sci, Inst Problems Chem Phys, 1 Prosp Akad Semenova, Chernogolovka 142432, Moscow Region, Russia. EM bazhen@cat.icp.ac.ru; MABorovinskaya@lbl.gov RI Kovaleva, Nadezhda/C-3650-2014 NR 37 TC 1 Z9 2 U1 0 U2 2 PU CONSULTANTS BUREAU PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1066-5285 J9 RUSS CHEM B+ JI Russ. Chem. Bull. PD AUG PY 2004 VL 53 IS 8 BP 1646 EP 1654 DI 10.1007/s11172-005-0011-3 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA 878HN UT WOS:000225637500011 ER PT J AU Balyanov, A Kutnyakova, J Amirkhanova, NA Stolyarov, VV Valiev, RZ Liao, XZ Zhao, YH Jiang, YB Xu, HF Lowe, TC Zhu, YT AF Balyanov, A Kutnyakova, J Amirkhanova, NA Stolyarov, VV Valiev, RZ Liao, XZ Zhao, YH Jiang, YB Xu, HF Lowe, TC Zhu, YT TI Corrosion resistance of ultra fine-grained Ti SO SCRIPTA MATERIALIA LA English DT Article DE equal channel angular pressing (ECAP); titanium; corrosion; ultrafine grained microstructure ID BEHAVIOR; NICKEL AB We investigated the corrosion behavior of commercially pure (CP) Ti with both ultrafine-grained (UFG) and coarse-grained (CG) microstructures. It was found that the UFG Ti is more resistant to corrosion than its CG counterpart. The superior corrosion resistance of UFG Ti is believed to result from rapid passivation of UFG Ti and the impurity segregation to grain boundaries in CG Ti. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. C1 Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia. Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA. RP Zhu, YT (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, MS G755, Los Alamos, NM 87545 USA. EM yzhu@lanl.gov RI Zhu, Yuntian/B-3021-2008; Zhao, Yonghao/A-8521-2009; Liao, Xiaozhou/B-3168-2009; Lujan Center, LANL/G-4896-2012 OI Zhu, Yuntian/0000-0002-5961-7422; Liao, Xiaozhou/0000-0001-8565-1758; NR 12 TC 199 Z9 214 U1 2 U2 42 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD AUG PY 2004 VL 51 IS 3 BP 225 EP 229 DI 10.1016/j.scriptamat.2004.04.011 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 826SD UT WOS:000221848000007 ER PT J AU Fonda, RW Bingert, JF Colligan, KJ AF Fonda, RW Bingert, JF Colligan, KJ TI Development of grain structure during friction stir welding SO SCRIPTA MATERIALIA LA English DT Article DE microstructure; texture; friction stir welding; alumium ID TEXTURE DEVELOPMENT; ALUMINUM-ALLOY; MATERIAL FLOW; TORSION; MICROSTRUCTURE AB A stop-action friction stir weld has been prepared in Al-Li 2195 to "freeze in" the dynamic deformation field surrounding the FSW tool. Analysis of a plan-view section of this weld reveals important new details of the grain structure evolution and texture development occurring around the FSW tool. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. C1 USN, Res Lab, Washington, DC 20375 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Concurrent Technol Corp, Johnstown, PA USA. RP Fonda, RW (reprint author), USN, Res Lab, Code 6324,4555 Overlook Ave SW, Washington, DC 20375 USA. EM fonda@anvil.nrl.navy.mil NR 30 TC 177 Z9 187 U1 10 U2 74 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD AUG PY 2004 VL 51 IS 3 BP 243 EP 248 DI 10.1016/j.scriptamat.2004.04.017 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 826SD UT WOS:000221848000010 ER PT J AU Reed, RC Yeh, AC Tin, S Babu, SS Miller, MK AF Reed, RC Yeh, AC Tin, S Babu, SS Miller, MK TI Identification of the partitioning characteristics of ruthenium in single crystal superalloys using atom probe tomography SO SCRIPTA MATERIALIA LA English DT Article DE nickel alloys; atom-probe field-ion microscopy; elemental partitioning behaviour ID NICKEL; RHENIUM AB Two experimental Re-containing single crystal superalloys, one doped with Ru, are studied using atom probe tomography. This has allowed the partitioning coefficient of Ru to be determined, and the effect on the partitioning characteristics of the alloying elements Cr, Al, Re, Co, Ta, Hf and W to be identified. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. C1 Univ British Columbia, Dept Met & Mat Engn, Vancouver, BC V6T 1Z4, Canada. Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Reed, RC (reprint author), Univ British Columbia, Dept Met & Mat Engn, 309-6350 Stores Rd, Vancouver, BC V6T 1Z4, Canada. EM roger.reed@cmpe.ubc.ca RI Babu, Sudarsanam/D-1694-2010; Tin, Sammy/G-2869-2012 OI Babu, Sudarsanam/0000-0002-3531-2579; NR 13 TC 90 Z9 95 U1 5 U2 23 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD AUG PY 2004 VL 51 IS 4 BP 327 EP 331 DI 10.1016/j.scriptamat.2004.04.019 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 830FK UT WOS:000222106900009 ER PT J AU Cederberg, JG Biefeld, RM AF Cederberg, JG Biefeld, RM TI The growth of n-type GaSb by metal-organic chemical vapour deposition: effects of two-band conduction on carrier concentrations and donor activation SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article ID MOLECULAR-BEAM EPITAXY; GALLIUM ANTIMONIDE; TE; BAND; F1/2(ETA); MOBILITY; SHALLOW; MOVPE; GAAS; SE AB n-type GaSb has been prepared by metal-organic chemical vapour deposition with tellurium donors using diethyltelluride as the dopant precursor. The maximum carrier concentration achieved was 1.7 x 10(18) cm(-3), as measured by van der Pauw-Hall effect measurements, for an atomic tellurium concentration of 1.8 x 10(19) cm(-3). The apparent low activation of tellurium donors is explained by a model that considers the effect of electrons occupying both the Gamma and L bands in GaSb due to the small energy difference between the Gamma and L conduction band minima. The model also accounts for the apparent increase in the carrier concentration determined by van der Pauw-Hall effect measurements at cryogenic temperatures. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Cederberg, JG (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 26 TC 9 Z9 9 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD AUG PY 2004 VL 19 IS 8 BP 953 EP 958 AR PII S0268-1242(04)72903-X DI 10.1088/0268-1242/19/8/001 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA 869IC UT WOS:000224975600004 ER PT J AU Moon, P Sandi, G Stevens, D Kizilel, R AF Moon, P Sandi, G Stevens, D Kizilel, R TI Computational modeling of ionic transport in continuous and batch electrodialysis SO SEPARATION SCIENCE AND TECHNOLOGY LA English DT Article DE electrochemical modeling; electrodialysis; membrane; electrochemical separation; ionic solution ID CATION-EXCHANGE MEMBRANE; ACIDS AB We describe the transport of ions and dissociation of a single salt and a solvent solution in an electrodialysis (ED) stack. An ED stack basic unit is made of a two-compartment cell: dilute and concentrate. We use the fundamental principles of electrochemistry, transport phenomena, and thermodynamics to describe mechanisms and to predict the performance of the ED process. We propose and analyze three model formulations for a single salt (KCl). The first and the second models are for a one- and two-dimensional continuous ED, and the third examines batch ED. The models include the effect of the superficial velocity in the boundary layer near the ion-exchange membranes. We examine the diffusion and electromigration of ions in the polarization region and consider electromigration and convection in the bulk region. We show that the ionic surface concentration of both membranes in the dilute compartment is affected by two parameters: flow rate and current density. We also show that in the dilute compartment, concentration changes along the x-axis are greater than along the y-axis because the ionic flux along the x-axis is greater and is in the direction of the current. In simulations where the KCl dilute concentration ranges from 200 to 500 mol m(-3) with a constant concentrate concentration, the dilute voltage drop accounts for more than 36% of the total voltage drop. This value is reduced to 7% as the dilute concentration increases and contributions of both ion-exchange membrane drops account for more than 50% of the total cell voltage drop. All the three models were validated experimentally. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. IIT, Dept Environm Chem & Engn, Chicago, IL 60616 USA. RP Moon, P (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. EM pmoon@anl.gov NR 22 TC 18 Z9 18 U1 0 U2 4 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 USA SN 0149-6395 J9 SEPAR SCI TECHNOL JI Sep. Sci. Technol. PD AUG PY 2004 VL 39 IS 11 BP 2531 EP 2555 DI 10.1081/SS-200026714 PG 25 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA 853KG UT WOS:000223825900002 ER PT J AU Bobev, S Williams, DJ Thompson, JD Sarrao, JL AF Bobev, S Williams, DJ Thompson, JD Sarrao, JL TI Thermal expansion in YbGaGe SO SOLID STATE COMMUNICATIONS LA English DT Article DE metals; crystal structure and symmetry; thermal expansion; valence fluctuations; neutron scattering AB Thermal expansion and magnetic susceptibility measurements as a function of temperature are reported for YbGaGe. Despite the fact that this material has been claimed to show zero thermal expansion over a wide temperature range, we observe thermal expansion typical of metals and Pauli paramagnetic behavior, which perhaps indicates strong sample dependence in this system. Published by Elsevier Ltd. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Bobev, S (reprint author), Los Alamos Natl Lab, LANSCE-12 MS H805, Los Alamos, NM 87545 USA. EM sbobev@lanl.gov; sarrao@lanl.gov NR 8 TC 6 Z9 6 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD AUG PY 2004 VL 131 IS 7 BP 431 EP 433 DI 10.1016/j.ssc.2004.06.012 PG 3 WC Physics, Condensed Matter SC Physics GA 843JW UT WOS:000223075900003 ER PT J AU Idemoto, Y Matsuzawa, M Koura, N Takeuchi, K Richardson, JW Loong, CK AF Idemoto, Y Matsuzawa, M Koura, N Takeuchi, K Richardson, JW Loong, CK TI Effects of excess oxygen content on the hole-carrying CuO2-layers in Tl-2(Ba1-xSrx)(2)Ca(2)Cu(3)Oy superconducting oxides SO SOLID STATE COMMUNICATIONS LA English DT Article DE High-T-c superconductors; crystal structure and symmetry; valence; neutron diffraction ID CRYSTAL-STRUCTURE; PARAMETERS; CU; TL AB The effects of oxygen doping on the hole-carrying CuO2-layers in Tl-2(Ba1-xSrx)(2)Ca2Cu3Oy were studied by combined chemical and valence analysis, T-c measurements and neutron diffraction. The highest T-c is characterized by an optimal excess oxygen content, Deltay, dichotomizing the under- and over-doped regions for each Sr concentration. While the average TI valence is close to 3.0 and independent of Deltay, the average Cu valence shows a linear dependence with Deltay. An increase of the flatness of the CuO2 plane, characterized by the O(2)-Cu(2)-O(2) bond angle of similar to176degrees, was observed at the optimal Deltay. (C) 2004 Elsevier Ltd. All rights reserved. C1 Tokyo Univ Sci, Fac Sci & Technol, Dept Pure & Appl Chem, Noda, Chiba 2788510, Japan. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Tokyo Univ Sci, Fac Sci & Technol, Dept Pure & Appl Chem, 2641 Yamazaki, Noda, Chiba 2788510, Japan. EM idemoto@rs.noda.tus.ac.jp NR 14 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 EI 1879-2766 J9 SOLID STATE COMMUN JI Solid State Commun. PD AUG PY 2004 VL 131 IS 8 BP 513 EP 517 DI 10.1016/j.ssc.2004.04.017 PG 5 WC Physics, Condensed Matter SC Physics GA 845JZ UT WOS:000223240000006 ER PT J AU Chen, Q Hou, SS Schmidt-Rohr, K AF Chen, Q Hou, SS Schmidt-Rohr, K TI A simple scheme for probehead background suppression in one-pulse H-1 NMR SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; NMR; POLYETHYLENE; CLAY AB A very simple method for reducing probehead background signal in one-pulse H-1 nuclear magnetic resonance (NMR) spectra is presented. Two one-pulse spectra are recorded, the first with pulse length t(p1), the second with an L-times longer pulse, e.g. with L = 2. The second spectrum scaled by 1/L is subtracted from the first. Since the weak pulses experienced by spins outside the coil are in the linear regime, the background from outside the coil is effectively subtracted out. The background suppression efficiency is approximately 1.5b(2), where b is the ratio of the B-1 field inside the coil relative to that outside the coil. Experimentally, background suppression by at least a factor of 10 was achieved. Examples of background suppression in H-1 wideline as well as H-1 fast magic-angle spinning (MAS) one-pulse spectra of clay and polymer samples are shown. (C) 2003 Elsevier Inc. All rights reserved. C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. RP Schmidt-Rohr, K (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Gilman Hall, Ames, IA 50011 USA. EM srohr@iastate.edu NR 9 TC 36 Z9 36 U1 0 U2 11 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD AUG PY 2004 VL 26 IS 1 BP 11 EP 15 DI 10.1016/j.ssnmr.2003.08.002 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA 834SQ UT WOS:000222431500002 PM 15157534 ER PT J AU Wiench, JW Pruski, M AF Wiench, JW Pruski, M TI Probing through bond connectivities with MQMAS NMR SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article DE Al-27-P-31 HETCOR; MQMAS; quadrupolar nucleic; MQ-J-HETCOR; J coupling; INEPT; aluminophosphate ID SOLID-STATE NMR; POLARIZATION TRANSFER; QUADRUPOLAR NUCLEI; INEPT EXPERIMENTS; ENHANCEMENT; MAS; SPECTROSCOPY; SENSITIVITY; RESOLUTION; SPECTRA AB Polarization transfer from quadrupolar (Al-27) to spin-1/2 (P-31) nuclei via J-coupling is employed to measure two-dimensional (27)A -P-13 heteronuclear correlation spectra with isotropic resolution. The proposed experiment, MQ-J-HETCOR, uses multiple quantum magic angle spinning (MQMAS) NMR for elimination of the second-order quadrupolar broadening and INEPT, INEPTR. INEPT+ and DEPT sequences for the polarization transfer. The experimental conditions leading to best sensitivity and resolution are detailed using AIPO(4)-14 as a test sample. Published by Elsevier Inc. C1 Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. RP Pruski, M (reprint author), Iowa State Univ, US DOE, Ames Lab, 230 Spedding Hall, Ames, IA 50011 USA. EM mpruski@iastate.edu NR 30 TC 47 Z9 47 U1 2 U2 11 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD AUG PY 2004 VL 26 IS 1 BP 51 EP 55 DI 10.1016/j.ssnmr.2003.10.004 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA 834SQ UT WOS:000222431500007 PM 15157539 ER PT J AU Bontchev, RP Moore, RC AF Bontchev, RP Moore, RC TI A series of open-framework tin(II) phosphates: A[Sn-4(PO4)(3)] (A = Na, K, NH4) SO SOLID STATE SCIENCES LA English DT Article DE crystal structure; tin(II) phosphates; open frameworks; infrared spectra ID STRUCTURAL-CHARACTERIZATION; COBALT PHOSPHATES; TIN PHOSPHATE; CHEMISTRY; CHANNELS; SOLIDS AB A new series of isostructural open-framework tin(II) phosphates with general formula A[Sn-4(PO4)(3)], where A = Na, K, NH4, has been synthesized by hydrothermal methods. The crystal structures of NaSn4(PO4)(3) (I) and KSn4(PO4)(3) (II) have been solved by single crystal X-ray diffraction methods. Both phases crystallize in the trigonal space group R3c (#161) with Z = 6 and cell parameters a = 9.5508(13) Angstrom, c = 24.083(3) Angstrom for I, and a = 9.7124(11) Angstrom, c = 24.363(3) Angstrom for II. The structure consists of a negatively charged [Sn4(PO4)(3)](-) framework with channels running parallel to the a- and b-axes where the charge compensating A(+) cations are located. An interesting feature is that half of the channels are empty due to the specific geometry of the SnO3 units-the lone electron pair of the tin atoms "protrudes" in these channels thus preventing the insertion of A(+). The new phases have also been characterized by infrared and thermogravimetric analyses. (C) 2004 Elsevier SAS. All rights reserved. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Bontchev, RP (reprint author), Sandia Natl Labs, POB 5800,MS 0779, Albuquerque, NM 87185 USA. EM rpbontc@sandia.gov; rcmoore@sandia.gov NR 31 TC 5 Z9 5 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1293-2558 J9 SOLID STATE SCI JI Solid State Sci. PD AUG PY 2004 VL 6 IS 8 BP 867 EP 873 DI 10.1016/j.solidstatesciences.2004.01.015 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 851RO UT WOS:000223702900014 ER PT J AU Liao, XZ Serquis, A Zhu, YT Peterson, DE Mueller, FM Xu, HF AF Liao, XZ Serquis, A Zhu, YT Peterson, DE Mueller, FM Xu, HF TI Strain effect on the critical superconducting temperature of MgB2 SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article ID IRREVERSIBILITY FIELD; MISFIT DISLOCATIONS; MAGNESIUM DIBORIDE; HETEROSTRUCTURES; TRANSITION; PRESSURE; DEFECTS; FILMS; AL AB MgB2 samples synthesized by solid-state reaction were found to contain several types of crystalline defects, including Mg deficiency, coherent precipitates, screw dislocations, and oxygen impurity, depending on the synthesis conditions. The Mg, deficiency introduced significant strain in the crystalline lattice of MgB2. A high density of screw dislocations lying on (0001) planes with a Burgers vector of (1120) partially relieved the lattice strain. The remnant strain in the MgB2 lattice directly determines the critical superconducting temperature, which decreases with strain. A small amount of oxygen dissolved in the MgB2 matrix is not responsible for lowering T-c observed in our samples. C1 Los Alamos Natl Lab, Superconduct Technol Ctr, Los Alamos, NM 87545 USA. Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA. RP Liao, XZ (reprint author), Los Alamos Natl Lab, Superconduct Technol Ctr, POB 1663, Los Alamos, NM 87545 USA. EM xzliao@lanl.gov RI Zhu, Yuntian/B-3021-2008; Liao, Xiaozhou/B-3168-2009; Serquis, Adriana/L-6554-2015 OI Zhu, Yuntian/0000-0002-5961-7422; Liao, Xiaozhou/0000-0001-8565-1758; Serquis, Adriana/0000-0003-1499-4782 NR 26 TC 10 Z9 10 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD AUG PY 2004 VL 17 IS 8 BP 1026 EP 1030 AR PII S0953-2048(04)78917-4 DI 10.1088/0953-2048/17/8/014 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 849XD UT WOS:000223574000016 ER PT J AU Varga, K Wang, LG Pantelides, ST Zhang, ZY AF Varga, K Wang, LG Pantelides, ST Zhang, ZY TI Critical layer thickness in Stranski-Krastanow growth of Ge on Si(001) SO SURFACE SCIENCE LA English DT Article DE epitaxy; growth; surface relaxation and reconstruction; surface energy; germanium; silicon; density functional calculations ID COVERED SI(001); MISSING DIMERS; SI(100); STRESS; FILMS; ENERGY; SEMICONDUCTORS; GE/SI(001); GERMANIUM; SURFACES AB Using first-principles total energy calculations within density functional theory, we assess quantitatively the relative importance of different types of surface reconstructions in defining the critical layer thickness, h(c), for islanding in Stranski-Krastanow growth of Ge on Si(0 0 1). We show that, if the (2 x 1) reconstruction of the Si(0 0 1) substrate were assumed to be preserved at the growth front of the Ge overlayer, an underestimated h(c) would be obtained. In contrast, proper inclusion of the dimer buckling and the appearance of the (2 x N) superstructure as the first strain-relieving mechanisms leads to delayed islanding, with h(c) equal to the experimental value of 3-4 monolayers. (C) 2004 Elsevier B.V. All rights reserved. C1 Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RP Varga, K (reprint author), Oak Ridge Natl Lab, Condensed Matter Sci Div, Bethel Valley Rd, Oak Ridge, TN 37831 USA. EM vargak@ornl.gov RI Varga, Kalman/A-7102-2013 NR 36 TC 13 Z9 13 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD AUG 1 PY 2004 VL 562 IS 1-3 BP L225 EP L230 DI 10.1016/j.susc.2004.06.149 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 841UZ UT WOS:000222958400001 ER PT J AU Yeh, V Yakes, M Hupalo, M Tringides, MC AF Yeh, V Yakes, M Hupalo, M Tringides, MC TI Low temperature formation of numerous phases in Pb/Si(111) SO SURFACE SCIENCE LA English DT Article DE surface thermodynamics (including phase transitions); low energy electron diffraction (LEED); scanning tunneling microscopy; lead; silicon ID DEVILS STAIRCASE; COMMENSURATE PHASES; ISING-MODEL; PB; TRANSITION; SI(111); LATTICES AB The formation of numerous (similar to15) phases within a narrow coverage range 6/5 < theta < 4/3 ML found in Pb/Si(111) is an excellent candidate for the "Devil's Staircase". With SPA-LEED and STM it was found that these phases are built from two generating phases and extend over macroscopic distances (similar to0.5 mm) which requires extraordinary coverage uniformity. Very surprisingly, these phases form after stepwise coverage deposition at T similar to 120 K which indicates an unusual pathway of low temperature self-organization. (C) 2004 Elsevier B.V. All rights reserved. C1 Iowa State Univ Sci & Technol, Dept Phys, Ames, IA 50011 USA. US DOE, Ames Lab, Ames, IA 50011 USA. RP Tringides, MC (reprint author), Iowa State Univ Sci & Technol, Dept Phys, Ames, IA 50011 USA. EM tringides@ameslab.gov RI Yakes, Michael/E-5510-2011 NR 24 TC 1 Z9 1 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 1 PY 2004 VL 562 IS 1-3 BP L238 EP L244 DI 10.1016/j.susc.2004.05.133 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 841UZ UT WOS:000222958400003 ER PT J AU Hawks, C Makos, K Bell, D Wambach, PE Burroughs, GE AF Hawks, C Makos, K Bell, D Wambach, PE Burroughs, GE TI An inexpensive method to test for mercury vapor in herbarium cabinets SO TAXON LA English DT Article DE corrosive sublimate; herbaria; mercuric chloride; mercury contamination; mercury detection; mercury indicator; mercury vapor AB Mercuric chloride has been used for control of insect and fungal infestations in herbarium collections for over two centuries. One of the lasting effects of this use is the long-term evolution of elemental mercury vapor from treated specimens. The vapor can contaminate untreated specimens sharing the same closed environment and can pose a human health hazard. By modifying the technique for use of a commercially available mercury indicating powder (Mallinckrodt Baker, Inc., J. T. Baker Mercury Indicator) it is possible to create an inexpensive and fairly rapid test for mercury vapor in herbarium cabinets. The indicator is mixed with deionized water and applied to glass microscope slides. One or more slides are placed inside a cabinet and any color change in the indicator is compared to unexposed controls. In the authors' experiments, the indicator results were compared against readings taken using a Jerome 431-X Mercury Vapor Analyzer and a Lumex RA-915+ Multifunctional Mercury Analyzer and were found to be broadly related to the concentration of mercury vapor present in each cabinet. The method can be used to check for mercury contamination in incoming shipments of specimens and to identify cabinets that currently contain or formerly contained contaminated specimens. Practical safety Guidelines have been developed for accessing cabinets that give a positive test for the vapor and for handling contaminated specimens. C1 Smithsonian Off Safety & Environm Management, Washington, DC 20560 USA. Smithsonian Inst, Natl Museum Nat Hist, Dept Systemat Biol, Bot Sect, Washington, DC 20560 USA. US DOE, Washington, DC 20585 USA. NIOSH, Robert A Taft Labs, Cincinnati, OH 45226 USA. RP Bell, D (reprint author), 2419 Barbour Rd, Falls Church, VA 22043 USA. EM cahawks@aol.com; makosk@si.edu; bell.deborah@nmnh.si.edu; paul.wambach@eh.doe.gov; geb1@cdc.gov NR 40 TC 4 Z9 4 U1 1 U2 5 PU INT ASSOC PLANT TAXONOMY PI VIENNA PA C/O UNIV VIENNA, INST BOTANY, RENNWEG 14, A-1030 VIENNA, AUSTRIA SN 0040-0262 J9 TAXON JI Taxon PD AUG PY 2004 VL 53 IS 3 BP 783 EP 790 DI 10.2307/4135451 PG 8 WC Plant Sciences; Evolutionary Biology SC Plant Sciences; Evolutionary Biology GA 860WC UT WOS:000224373500014 ER PT J AU Yin, TM DiFazio, SP Gunter, LE Riemenschneider, D Tuskan, GA AF Yin, TM DiFazio, SP Gunter, LE Riemenschneider, D Tuskan, GA TI Large-scale heterospecific segregation distortion in Populus revealed by a dense genetic map SO THEORETICAL AND APPLIED GENETICS LA English DT Article ID QUANTITATIVE TRAIT LOCI; FRAGMENT LENGTH POLYMORPHISMS; WOOD PROPERTY TRAITS; FULL-SIB FAMILY; LINKAGE MAPS; RAPD MARKERS; MOLECULAR-GENETICS; GENOME LENGTH; FOREST TREE; SUPPRESSED RECOMBINATION AB We report the most complete genetic map to have been constructed for the genus Populus. This map includes 544 markers mapped onto 19 linkage groups, equivalent to the Populus chromosome number, with all markers displaying internally consistent linkage patterns. We estimate the genome length to be between 2,300 and 2,500 cM, based both on the observed number of crossovers in the maternal haplotypes, as well as the total observed map length. Genome coverage was estimated to be greater than 99.9% at 20 cM per marker. We did not detect obvious recombination repression in the maternal tree (a hybrid of Populus trichocarpa Hooker x P. deltoides Marsh.) compared to the paternal tree (pure P. deltoides). Finally, most markers exhibiting segregation distortion were derived from the donor parent in this backcross, and generally occurred in large contiguous blocks on two linkage groups. We hypothesize that divergent selection has occurred on chromosomal scales among the parental species used to create this pedigree, and explore the evolutionary implications of this observation. This genetic linkage map provides the most comprehensive view of the Populus genome reported to date and will prove invaluable for future inquiries into the structural and functional genomics, evolutionary biology, and genetic improvement of this ecologically important model species. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Nanjing Forestry Univ, State Forestry Adm, Key Lab Forest Tree Genet Engn, Nanjing 210037, JS, Peoples R China. US Forest Serv, USDA, N Cent Forest Expt Stn, Forestry Sci Lab, Rhinelander, WI 54501 USA. RP DiFazio, SP (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. EM difazios@ornl.gov RI Tuskan, Gerald/A-6225-2011; Gunter, Lee/L-3480-2016 OI Tuskan, Gerald/0000-0003-0106-1289; Gunter, Lee/0000-0003-1211-7532 NR 85 TC 99 Z9 114 U1 2 U2 27 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0040-5752 J9 THEOR APPL GENET JI Theor. Appl. Genet. PD AUG PY 2004 VL 109 IS 3 BP 451 EP 463 DI 10.1007/s00122-004-1653-5 PG 13 WC Agronomy; Plant Sciences; Genetics & Heredity; Horticulture SC Agriculture; Plant Sciences; Genetics & Heredity GA 843PW UT WOS:000223097700001 PM 15168022 ER PT J AU Melotto, M Coelho, MF Pedrosa-Harand, A Kelly, JD Camargo, LEA AF Melotto, M Coelho, MF Pedrosa-Harand, A Kelly, JD Camargo, LEA TI The anthracnose resistance locus Co-4 of common bean is located on chromosome 3 and contains putative disease resistance-related genes SO THEORETICAL AND APPLIED GENETICS LA English DT Article ID PHASEOLUS-VULGARIS L; ARABIDOPSIS-THALIANA; LINKAGE MAP; PROTEIN; CLONING; DATABASE; L.; LOCALIZATION; EXPRESSION; EVOLUTION AB The broadest based resistance to anthracnose of common bean (Phaseolus vulgaris L.) is conferred by the Co-4 locus. We sequenced a bacterial artificial chromosome clone harboring part of the Co-4 locus of the bean genotype Sprite and assembled a single contig of 106.5 kb for functional annotation. This region contained five copies of the COK-4 gene that encodes for a serine threonine kinase protein previously mapped to the Co-4 locus and 19 novel genes with no similarity to any previously identified genes of common bean. Several putative genes of the Co-4 locus seemed to be expressed as they matched perfectly with bean expressed sequence tags. The expression of the COK-4 genes was assessed by reverse transcription (RT)-PCR, and a single 850-bp cDNA fragment was sequenced and compared with the genomic sequences of the COK-4 homologs. Although the COK-4 cDNA was isolated from a different bean cultivar, it showed high similarity (95%) to the exons of genes BA17 and BA21, suggesting that they were expressed. In a phylogenetic tree including all currently available Pto-like sequences from Phaseolus species, the COK-4 homologs formed a single cluster with the Pto gene, whereas two sequences from P coccineus and all sequences of P. vulgaris formed two closely related clusters. The Co-4 locus was physically mapped to the short arm of bean chromosome 3, which corresponds to linkage group B8. This study represents a first step in gaining an understanding of the genomic organization of an anthracnose resistance locus of common bean and provides molecular data for comparative analysis with other plant species. C1 Univ Vienna, Dept Cell Biol & Genet, Inst Bot, A-1030 Vienna, Austria. Michigan State Univ, Dept Crop & Soil Sci, E Lansing, MI 48824 USA. Univ Sao Paulo, Dept Fitopatol, Genet Mol Lab, ESALQ, BR-13418900 Piracicaba, SP, Brazil. RP Melotto, M (reprint author), Michigan State Univ, MSU DOE, Plant Res Lab, 206 Plant Biol Bldg, E Lansing, MI 48824 USA. EM melottom@msu.edu RI Pedrosa-Harand, Andrea/D-9286-2012; Camargo, Luis Eduardo/C-2735-2012 OI Pedrosa-Harand, Andrea/0000-0001-5213-4770; Camargo, Luis Eduardo/0000-0002-5650-5695 NR 53 TC 30 Z9 39 U1 2 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0040-5752 J9 THEOR APPL GENET JI Theor. Appl. Genet. PD AUG PY 2004 VL 109 IS 4 BP 690 EP 699 DI 10.1007/s00122-004-1697-6 PG 10 WC Agronomy; Plant Sciences; Genetics & Heredity; Horticulture SC Agriculture; Plant Sciences; Genetics & Heredity GA 855EW UT WOS:000223957000002 PM 15221144 ER PT J AU Rubinstein, R Clark, TT AF Rubinstein, R Clark, TT TI A generalized Heisenberg model for turbulent spectral dynamics SO THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS LA English DT Article DE isotropic turbulence; turbulence closures; Heisenberg model ID ISOTROPIC TURBULENCE; ENERGY-TRANSFER; LOCAL INTERACTIONS; DRIVEN FLOWS; SIMULATIONS; CLOSURE AB A simplified closure model for turbulent spectral dynamics is proposed. Beginning with an analytical closure similar to the test field model, energy transfer is modeled by replacing general triad interactions by degenerate triad interactions, resulting in a pair interaction description similar to the classical Heisenberg model. This energy transfer model is coupled to a similarly simplified time scale evolution equation. These simplifications make it possible to preserve many features of much more complex analytical closures like the direct interaction approximation and the Lagrangian renormalized approximation in a computationally tractable model. The model is tested in decaying isotropic turbulence and in forced isotropic turbulence. It is found to exhibit refined properties, including energy backscatter to large scales and the bottleneck phenomenon. C1 NASA, Langley Res Ctr, Computat Modeling & Simulat Branch, Hampton, VA 23861 USA. Los Alamos Natl Lab, X Div, Grp X3, Los Alamos, NM 87545 USA. RP Rubinstein, R (reprint author), NASA, Langley Res Ctr, Computat Modeling & Simulat Branch, Hampton, VA 23861 USA. EM r.rubinstein@larc.nasa.gov NR 52 TC 10 Z9 10 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0935-4964 J9 THEOR COMP FLUID DYN JI Theor. Comput. Fluid Dyn. PD AUG PY 2004 VL 17 IS 4 BP 249 EP 272 DI 10.1007/s00162-004-0104-x PG 24 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 842NQ UT WOS:000223011500003 ER PT J AU Kousba, AA Sultatos, LG Poet, TS Timchalk, C AF Kousba, AA Sultatos, LG Poet, TS Timchalk, C TI Comparison of chlorpyrifos-oxon and paraoxon acetylcholinesterase inhibition dynamics: Potential role of a peripheral binding site SO TOXICOLOGICAL SCIENCES LA English DT Article DE acetylcholinesterase; organophosphate insecticide; chloropyrifos oxon; paraoxon ID INVIVO CHOLINESTERASE INHIBITION; BRAIN ACETYLCHOLINESTERASE; RAT-LIVER; ORGANOPHOSPHATE; BUTYRYLCHOLINESTERASE; INSECTICIDES; REACTIVATION; SENSITIVITY; PESTICIDES; METABOLISM AB The primary mechanism of action for organophosphorus (OP) insecticides, like chlorpyrifos and parathion, is to inhibit acetylcholinesterase (AChE) by their oxygenated metabolites (oxons), due to the phosphorylation of the serine hydroxyl group located in the active site of the molecule. The rate of phosphorylation is described by the bimolecular inhibitory rate constant (k(i)), which has been used for quantification of OP inhibitory capacity. It has been proposed that a peripheral binding site exists on the AChE molecule, which, when occupied, reduces the capacity of additional oxon molecules to phosphorylate the active site. The aim of this study was to evaluate the interaction of chlorpyrifos oxon (CPO) and paraoxon (PO) with rat brain AChE to assess the dynamics of AChE inhibition and the potential role of a peripheral binding site. The k(i) values for AChE inhibition determined at oxon concentrations of 1-100 nM were 0.206 +/- 0.018 and 0.0216 nM(-1)h(-1) for CPO and PO, respectively. The spontaneous reactivation rates of the inhibited AChE for CPO and PO were 0.084-0.087 (two determinations) and 0.091 +/- 0.023 h(-1), respectively. In contrast, the k(i) values estimated at a low oxon concentration (1 pM) were similar to1,000- and 10,000-fold higher than those determined at high CPO and PO concentrations, respectively. At low concentrations, the k(i) estimates were approximately similar for both CPO and PO (150-180 [two determinations] and 300 +/- 180 nM(-1)h(-1), respectively). This implies that, at low concentrations, both oxons exhibited similar inhibitory potency in contrast to the marked difference exhibited at higher concentrations. These results support the potential importance of a secondary peripheral binding site associated with AChE kinetics, particularly at low, environmentally relevant concentrations. C1 Battelle Mem Inst, Pacific NW Div, Richland, WA 99352 USA. Univ Med & Dent New Jersey, Newark, NJ 07103 USA. RP Timchalk, C (reprint author), Battelle Mem Inst, Pacific NW Div, 902 Battelle Blvd,POB 999, Richland, WA 99352 USA. EM charles.timchalk@pnl.gov FU NIOSH CDC HHS [1 R01 OH03629-01A2] NR 32 TC 51 Z9 52 U1 1 U2 3 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1096-6080 J9 TOXICOL SCI JI Toxicol. Sci. PD AUG PY 2004 VL 80 IS 2 BP 239 EP 248 DI 10.1093/toxsci/kfh163 PG 10 WC Toxicology SC Toxicology GA 836LQ UT WOS:000222557600006 PM 15141101 ER PT J AU Ali, M Shames, AI Gangopadhyay, S Saha, B Meyerstein, D AF Ali, M Shames, AI Gangopadhyay, S Saha, B Meyerstein, D TI Silver(II) complexes of tetraazamacrocycles: studies on e.p.r. and electron transfer kinetics with thiosulfate ion SO TRANSITION METAL CHEMISTRY LA English DT Article ID AQUEOUS ALKALINE MEDIA; WEAK ACIDIC MEDIUM; TETRAHYDROXOARGENTATE(III) ION; OXIDATION; MECHANISM; LIGAND; NICKEL(III); ACTIVATION; REDUCTION AB The e.p.r. studies of Ag-II complexes of three tetraazamacrocycles, 1,4,8,11-tetraazacyclotetradecane ( cyclam) ( I), 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclo-teradecane-4,11-diene (Me6CD) (II) and 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclo-teradecane (Me6Cy) (III) and the electron transfer between [Ag-II(cyclam)](2+) and thiosulfate ion are described. The e.p.r. studies reveal that the spectra are almost the same as those reported earlier, particularly, for polycrystalline material and are typical of a d(9) planar Ag-II complexes. Previous e.p.r. studies on these square planar polycrystalline complexes showed no ligand hyperfine splitting. Reinvestigation of the e.p.r. spectra of these complexes in both the solid state and in solution at room (T similar to 297 K) and at low (T = 120 K) temperature reveals resolved hyperfine structures in solution for [Ag(Me6CD)](2+) and [Ag(Me6Cy)](2+) complexes. Surprisingly, such a structure was not observed in solutions of [Ag(cyclam)](2+). Computer simulations of the hyperfine structure observed in solutions are in good agreement with structural formulae proposed. The oxidation of thiosulfate ion by [Ag(cyclam)](2+) follows the rate law: -d/dt[Ag-II(cyclam)(2+)] = (k(1)Q(1)[H+] + k(2)Q(2)K(a2))/([H+] + K-a2)[Ag-II(cyclam)(2+)][S2O32-] and an inner- sphere mechanism is proposed, based on the spectral and kinetic evidence. C1 Jadavpur Univ, Dept Chem, Kolkata 700032, W Bengal, India. Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel. Gurudas Coll, Dept Chem, Kolkata 700054, India. Iowa State Univ, Ames Lab, Dept Chem, Ames, IA 50011 USA. Ben Gurion Univ Negev, Dept Chem, IL-84105 Beer Sheva, Israel. Coll Judea & Samaria, Ariel, Israel. RP Ali, M (reprint author), Jadavpur Univ, Dept Chem, Kolkata 700032, W Bengal, India. NR 38 TC 4 Z9 4 U1 1 U2 5 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0340-4285 EI 1572-901X J9 TRANSIT METAL CHEM JI Transit. Met. Chem. PD AUG PY 2004 VL 29 IS 5 BP 463 EP 470 DI 10.1023/B:TMCH.0000037507.81041.a9 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 844ZU UT WOS:000223206200001 ER PT J AU Facciotti, MT Rouhani-Manshadi, S Glaeser, RM AF Facciotti, MT Rouhani-Manshadi, S Glaeser, RM TI Energy transduction in transmembrane ion pumps SO TRENDS IN BIOCHEMICAL SCIENCES LA English DT Review ID X-RAY-STRUCTURE; ANGSTROM RESOLUTION; CRYSTAL-STRUCTURE; BACTERIORHODOPSIN PHOTOCYCLE; ESCHERICHIA-COLI; CALCIUM-PUMP; STRUCTURAL-CHANGES; PURPLE MEMBRANE; CRYSTALLOGRAPHIC STRUCTURE; SARCOPLASMIC-RETICULUM AB Recent crystallographic structures of three different ion pumps provide a first view of the mechanisms by which these molecular machines transfer ions across cell membranes against an electrochemical gradient. Each of the structures reinforces the concept that several buried counter ions have central roles in substrate recruitment, substrate binding and energy transduction during ion pumping. The spatial organization of the counter ions suggests that, initially, one or more counter ions lowers the Born energy cost of binding a substrate ion in the low-dielectric interior of the membrane. Subsequently, a ligand-induced conformationall change seems to close a charged access gate to prevent backflow from a subsequent, low-affinity state of the pump. A final role of the buried counter ions might be to couple the input of external energy to a small charge separation between the substrate ion and the buried counter ions, thereby decreasing the binding affinity for the substrate ion in preparation for its release on the high-energy side of the membrane. C1 Inst Syst Biol, Seattle, WA 98103 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Donner Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Mol & Cell Biol, Berkeley, CA 94720 USA. RP Glaeser, RM (reprint author), Inst Syst Biol, 1441 N 34th St, Seattle, WA 98103 USA. EM rmglaeser@ibl.gov FU NIGMS NIH HHS [GM51487] NR 57 TC 8 Z9 8 U1 0 U2 5 PU ELSEVIER SCIENCE LONDON PI LONDON PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND SN 0968-0004 J9 TRENDS BIOCHEM SCI JI Trends Biochem.Sci. PD AUG PY 2004 VL 29 IS 8 BP 445 EP 451 DI 10.1016/j.tibs.2004.06.004 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 847SW UT WOS:000223416200009 PM 15362229 ER PT J AU Pinnaduwage, LA Thundat, T Gehl, A Wilson, SD Hedden, DL Lareau, RT AF Pinnaduwage, LA Thundat, T Gehl, A Wilson, SD Hedden, DL Lareau, RT TI Desorption characteristics, of uncoated silicon microcantilever surfaces for explosive and common nonexplosive vapors SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 5th International Conference on Scanning Probe Microscopy CY MAY 23-26, 2003 CL Heythrop Park, ENGLAND DE desorption; explosive; TNT; PETN; RDX; microcantiliver AB We measured the desorption of explosive trinitrotoluene (TNT), pentaerythritol tetranitrate (PETN), and hexahydro-1,3,5-triazine (RDX) vapors from piezoresistive silicon microcantilevers under ambient air. Depending on the amount of vapor loaded on the cantilever, TNT desorption took a few minutes to tens of minutes (for nanogram quantities). On the other hand, no significant loss of PETN or RDX was observed after many hours. We also measured desorption of common "nonexplosive" compounds (water, acetone, and ethyl alcohol) and observed that desorption was too fast to be measured. There is a good correlation between the desorption time and the melting point (or the vapor pressure) of a particular substance. In principle, this method can be used to measure desorption rates of various substances from cantilever surfaces. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Tennessee, Oak Ridge Natl Lab, Dept Phys, Knoxville, TN 37996 USA. US Dept Homeland Secur, Atlantic City, NJ 08405 USA. RP Pinnaduwage, LA (reprint author), Univ Tennessee, Oak Ridge Natl Lab, Dept Phys, POB 2008, Knoxville, TN 37996 USA. EM llp@ornl.gov NR 14 TC 24 Z9 25 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD AUG PY 2004 VL 100 IS 3-4 BP 211 EP 216 DI 10.1016/j.ultramic.2003.11.006 PG 6 WC Microscopy SC Microscopy GA 838MH UT WOS:000222716900012 PM 15231312 ER PT J AU Tian, F Pei, JH Hedden, DL Brown, GM Thundat, T AF Tian, F Pei, JH Hedden, DL Brown, GM Thundat, T TI Observation of the surface stress induced in microcantilevers by electrochemical redox processes SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 5th International Conference on Scanning Probe Microscopy CY MAY 23-26, 2003 CL Heythrop Park, ENGLAND DE surface stress; microcantilever; deflection; electrochemical potential ID ATOMIC-FORCE MICROSCOPE; AU(111); SOLIDS AB The potential-induced surface stress of a solid electrode was investigated in an electrochemical cell. Gold-coated atomic force microscopy microcantilevers were used as working electrodes to measure the current-potential response (by cyclic voltammetry) and simultaneous bending characteristics in solutions of NaNO3 and K3Fe(CN)(6)/NaNO3. The observed changes of differential surface stress at a microcantilever electrode were attributed to electrochemical-potential-induced changes in surface charge density, ion adsorption/desorption, and electron transfer across the electrode surface. The potential dependent change in stress shows promise for the study of microscopic properties at the solid-electrolyte interface. (C) 2004 Elsevier B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Thundat, T (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM thundattg@ornl.gov NR 18 TC 26 Z9 26 U1 3 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD AUG PY 2004 VL 100 IS 3-4 BP 217 EP 223 DI 10.1016/j.ultramic.2003.12.012 PG 7 WC Microscopy SC Microscopy GA 838MH UT WOS:000222716900013 PM 15231313 ER PT J AU Bouhelier, A Beversluis, MR Novotny, L AF Bouhelier, A Beversluis, MR Novotny, L TI Applications of field-enhanced near-field optical microscopy SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 5th International Conference on Scanning Probe Microscopy CY MAY 23-26, 2003 CL Heythrop Park, ENGLAND DE near-field optics; field enhancement; second-harmonic generation; photoluminescence ID 2ND-HARMONIC GENERATION; RAMAN-SCATTERING; NOBLE-METALS; SURFACES; CLUSTERS; TIPS AB Metal nanostructures such as sharp tips can enhance emission yields through shape-induced local field enhancement. The enhancement originates from two mechanisms: surface plasmons and electrostatic lightening rod effects. We present fluorescence imaging using the strong local field created at the apex of a gold tip and demonstrate optical resolution of 25 nm. The enhancement effect gives also rise to photoemission from the tip itself. Measured spectra of the tip emission show a broad band continuum together with a second-harmonic peak. Both continuum and second-harmonic are confined at the apex of the tip. We find that, depending on the spectral position, the photoluminescence originates either from intraband or from interband transitions. The nonlinear response can be described by a single dipole oscillating at the second-harmonic frequency and oriented along the tip axis. These unique properties can be used to map focal fields distributions. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Rochester, Inst Opt, Rochester, NY 14627 USA. RP Bouhelier, A (reprint author), Argonne Natl Lab, Div Chem, Bldg 200,9700 S Cass Ave, Argonne, IL 60439 USA. EM bouhelier@anl.gov RI Bouhelier, Alexandre/A-1960-2010 NR 21 TC 25 Z9 27 U1 2 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD AUG PY 2004 VL 100 IS 3-4 BP 413 EP 419 DI 10.1016/j.ultramic.2003.10.007 PG 7 WC Microscopy SC Microscopy GA 838MH UT WOS:000222716900033 PM 15231333 ER PT J AU Passian, A Wig, A Lereu, AL Evans, PG Meriaudeau, F Thundat, T Ferrell, TL AF Passian, A Wig, A Lereu, AL Evans, PG Meriaudeau, F Thundat, T Ferrell, TL TI Probing large area surface plasmon interference in thin metal films using photon scanning tunneling microscopy SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 5th International Conference on Scanning Probe Microscopy CY MAY 23-26, 2003 CL Heythrop Park, ENGLAND DE surface plasmons; interference; scanning probe microscopy; dispersion relation; metal thin films ID LARGE-SCALE REPLICATION; FIBER-OPTIC SENSOR; SENSITIVITY ENHANCEMENT; RESONANCE; EXCITATION; BUTTON AB The interference of surface plasmons can provide important information regarding the surface features of the hosting thin metal film. We present an investigation of the interference of optically excited surface plasmons in the Kretschmann configuration in the visible spectrum. Large area surface plasmon interference regions are generated at several wavelengths and imaged with the photon scanning tunneling microscope. Furthermore, we discuss the non-retarded dispersion relations for the surface plasmons in the probe-metal system modeled as confocal hyperboloids of revolution in the spheroidal coordinate systems. (C) 2004 Elsevier B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Bourgogne, Lab Opt Submicron, Dept Phys, F-21011 Dijon, France. Univ Bourgogne, IUT Creusot, F-71200 Le Creusot, France. RP Passian, A (reprint author), Oak Ridge Natl Lab, Bethel Valley Rd,Bldg 4500 S,MS 6123, Oak Ridge, TN 37831 USA. EM passian@utk.edu RI Lereu, Aude/P-6414-2016 OI Lereu, Aude/0000-0001-7390-7832 NR 31 TC 15 Z9 15 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD AUG PY 2004 VL 100 IS 3-4 BP 429 EP 436 DI 10.1016/j.ultramic.2003.11.018 PG 8 WC Microscopy SC Microscopy GA 838MH UT WOS:000222716900035 PM 15231335 ER PT J AU Finsterle, S Oldenburg, CM AF Finsterle, S Oldenburg, CM TI Research advances in vadose zone hydrology through simulations with the TOUGH codes: Preface from the guest editors SO VADOSE ZONE JOURNAL LA English DT Editorial Material C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Finsterle, S (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, 1 Cyclotron Rd,Mail Stop 90-1116, Berkeley, CA 94720 USA. EM SAFinsterle@lbl.gov RI Oldenburg, Curtis/L-6219-2013; Finsterle, Stefan/A-8360-2009 OI Oldenburg, Curtis/0000-0002-0132-6016; Finsterle, Stefan/0000-0002-4446-9906 NR 0 TC 0 Z9 0 U1 0 U2 1 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 737 EP 737 PG 1 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000001 ER PT J AU Pruess, K AF Pruess, K TI The TOUGH codes - A family of simulation tools for multiphase flow and transport processes in permeable media SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID KRAFLA GEOTHERMAL-FIELD; FRACTURED POROUS-MEDIA; FLUID-FLOW; RESERVOIR SIMULATION; NUMERICAL-SIMULATION; TRACER TRANSPORT; HEAT-FLOW; ICELAND; SYSTEMS; CAPROCK AB Numerical simulation has become a widely practiced and accepted technique for studying flow and transport processes in the vadose zone and other subsurface flow systems. This article discusses a suite of codes, developed primarily at Lawrence Berkeley National Laboratory (LBNL), with the capability to model multiphase flows with phase change. We summarize history and goals in the development of the TOUGH codes, and present the governing equations for multiphase, multicomponent flow. Special emphasis is given to space discretization by means of integral finite differences (IFD). Issues of code implementation and architecture are addressed, as well as code applications, maintenance, and future developments. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM K_Pruess@lbl.gov NR 58 TC 165 Z9 170 U1 3 U2 35 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 738 EP 746 PG 9 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000002 ER PT J AU Finsterle, S AF Finsterle, S TI Multiphase inverse modeling: Review and iTOUGH2 applications SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID SOIL HYDRAULIC-PROPERTIES; STEP OUTFLOW EXPERIMENTS; 3-DIMENSIONAL NUMERICAL INVERSION; STEADY-STATE CONDITIONS; FRACTURED POROUS-MEDIA; CROSS-HOLE TESTS; PARAMETER-ESTIMATION; UNSATURATED FLOW; YUCCA MOUNTAIN; MULTISTEP OUTFLOW AB Calibration of a numerical process model against laboratory or field data is often referred to as "inverse modeling." As the numerical simulation models become more complex, the number of parameters to be estimated generally increases, requiring new testing, modeling, and inversion strategies. The purpose of this survey is to review inverse modeling approaches for unsaturated and multiphase flow models. The discussion focuses on applications rather than theoretical considerations, which have been previously reviewed in the context of saturated flow and transport modeling. We also examine model parameterization issues, specifically the representation of heterogeneity through a limited number of variables that can be subjected to parameter estimation and uncertainty propagation analyses. Different parameterization strategies are illustrated using the multiphase flow simulation-optimization code iTOUGH2. A comprehensive inverse modeling package (such as iTOUGH2, which includes automatic model calibration followed by an extensive residual, error, and uncertainty propagation analysis) is an essential tool to improve test design and data analysis of complex multiphase flow systems. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Finsterle, S (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM SAFinsterle@lbl.gov RI Finsterle, Stefan/A-8360-2009 OI Finsterle, Stefan/0000-0002-4446-9906 NR 113 TC 59 Z9 60 U1 1 U2 17 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 747 EP 762 PG 16 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000003 ER PT J AU Singleton, MJ Sonnenthal, EL Conrad, ME DePaolo, DJ Gee, GW AF Singleton, MJ Sonnenthal, EL Conrad, ME DePaolo, DJ Gee, GW TI Multiphase reactive transport modeling of seasonal infiltration events and stable isotope fractionation in unsaturated zone pore water and vapor at the Hanford site SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID NUMERICAL-MODEL; DRY SOILS; O-18; FLOW; EVAPORATION; DEUTERIUM; MOVEMENT; HYDROGEN; RECHARGE; OXYGEN AB Numerical simulations of transport and isotope fractionation provide, a method to quantitatively interpret vadose zone pore water stable isotope depth profiles based on soil properties, climatic conditions, and infiltration. We incorporate the temperature-dependent equilibration of stable isotopic species between water and water vapor, and their differing diffusive transport properties into the thermodynamic database of the reactive transport code TOUGHREACT. These simulations are used to illustrate the evolution of stable isotope profiles in semiarid regions where recharge during wet seasons disturbs the drying profile traditionally associated with vadose zone pore waters. Alternating wet and dry seasons lead to annual fluctuations in moisture content, capillary pressure, and stable isotope compositions in the vadose zone. Periodic infiltration models capture the effects of seasonal increases in precipitation and predict stable isotope profiles that are distinct from those observed under drying (zero infiltration) conditions. After infiltration, evaporation causes a shift to higher delta(18)O and deltaD values, which are preserved in the deeper pore waters. The magnitude of the isotopic composition shift preserved in vadose zone pore waters varies inversely with the rate of infiltration. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. Pacific NW Natl Lab, Environm Technol Div, Hydrol Grp, Richland, WA USA. RP Singleton, MJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM MJSingleton@lbl.gov RI Conrad, Mark/G-2767-2010; Sonnenthal, Eric/A-4336-2009 NR 38 TC 27 Z9 28 U1 6 U2 29 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 775 EP 785 PG 11 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000005 ER PT J AU Wu, YS Lu, GP Zhang, K Bodvarsson, GS AF Wu, YS Lu, GP Zhang, K Bodvarsson, GS TI A mountain-scale model for characterizing unsaturated flow and transport in fractured tuffs of Yucca Mountain SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID ZONE; NEVADA; REPOSITORY AB We present a large-scale modeling study characterizing fluid flow and tracer transport in the unsaturated zone (UZ) of Yucca Mountain, Nevada, the proposed underground repository site for storing high-level radioactive waste. The modeling study is conducted using a three-numerical model, which incorporates a wide variety of field data and takes into account the coupled processes of flow and transport in Yucca Mountain's highly heterogeneous, unsaturated, fractured porous rock. The modeling approach is based on a dual-continuum formulation. Using different conceptual models of unsaturated flow, various scenarios of current and future climate conditions and their effects on the UZ are evaluated to aid in the assessment of the repository's system performance. These models are calibrated against field-measured data. Model-predicted flow and transport processes under current and future climates are discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Wu, YS (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM yswu@lbl.gov RI Wu, Yu-Shu/A-5800-2011 NR 28 TC 21 Z9 22 U1 0 U2 2 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 796 EP 805 PG 10 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000007 ER PT J AU Ghezzehei, TA Trautz, RC Finsterle, S Cook, PJ Ahlers, CF AF Ghezzehei, TA Trautz, RC Finsterle, S Cook, PJ Ahlers, CF TI Modeling coupled evaporation and seepage in ventilated cavities SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID EXCLUSION PROBLEM; YUCCA MOUNTAIN; UNDERGROUND OPENINGS; CYLINDRICAL CAVITIES; FRACTURED ROCK; DRIFTS AB Cavities excavated in unsaturated geological formations are important to activities such as nuclear waste disposal and mining. Such cavities provide a unique setting for simultaneous occurrence of seepage and evaporation. Previously, inverse numerical modeling of field liquid-release tests and associated seepage into cavities were used to provide seepage-related large-scale formation properties, ignoring the impact of evaporation. The applicability of such models was limited to the narrow range of ventilation conditions under which the models calibrated. The objective of this study was to alleviate this limitation by incorporating evaporation into the seepage models. We modeled evaporation as an isothermal vapor diffusion process. The semi-physical model accounts for the relative humidity (RH), temperature, ventilation conditions of the cavities. The evaporation boundary layer thickness (BLT) over which diffusion occurs was estimated by calibration against free-water evaporation data collected inside the experimental cavities. The estimated values of BLT were 5 to 7 mm for the open underground drifts and 20 mm for niches closed off by bulkheads. Compared with previous models that neglected the effect of evaporation, this new approach showed significant improvement in capturing seepage fluctuations into open cavities of low RH. At high relative-humidity values (>85%), the effect of evaporation on seepage was very small. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Ghezzehei, TA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, MS 90R1116,1 Cyclotron Rd, Berkeley, CA 94720 USA. EM TAGhezzehei@lbl.gov RI Finsterle, Stefan/A-8360-2009; Ghezzehei, Teamrat/G-7483-2011 OI Finsterle, Stefan/0000-0002-4446-9906; Ghezzehei, Teamrat/0000-0002-0287-6212 NR 29 TC 26 Z9 27 U1 0 U2 9 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 806 EP 818 PG 13 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000008 ER PT J AU Birkholzer, JT Mukhopadhyay, S Tsang, YW AF Birkholzer, JT Mukhopadhyay, S Tsang, YW TI Modeling seepage into heated waste emplacement tunnels in unsaturated fractured rock SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID YUCCA MOUNTAIN; UNDERGROUND OPENINGS; DRIFT; TRANSPORT; NEVADA; TUFF AB Predicting the amount of water that may seep into waste emplacement tunnels ( drifts) is important for assessing the performance of the proposed geologic repository for high-level radioactive waste at Yucca Mountain, Nevada. The repository will be located in thick, partially saturated fractured tuff that - for the first several hundred years after emplacement - will be heated to above-boiling temperatures as a result of heat generation from the decay of radioactive waste. Heating of rock water to above-boiling conditions induces water saturation changes and perturbs water fluxes that affect the potential for water seepage into drifts. We describe numerical analyses of the coupled thermal-hydrological (TH) processes in the vicinity of waste emplacement drifts, evaluate the potential of seepage during the heating phase of the repository, and discuss the implications for the performance of the site. In addition to the capillary barrier at the rock-drift interface - independent of the thermal conditions - a second barrier exists to downward percolation at above-boiling conditions. This barrier is caused by vaporization of water in the fractured rock overlying the repository. A TOUGH2 dual-permeability simulation model was developed to analyze the combined effect of these barriers; it accounts for all relevant TH processes in response to heating, while incorporating the capillary barrier condition at the drift wall. Model results are presented for a variety of simulation cases that cover the expected variability and uncertainty of relevant rock properties and boundary conditions. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Birkholzer, JT (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Div Earth Sci, 1 Cyclotron Rd,MS 90-1116, Berkeley, CA 94720 USA. EM jtbirkholzer@lbl.gov RI Birkholzer, Jens/C-6783-2011 OI Birkholzer, Jens/0000-0002-7989-1912 NR 26 TC 13 Z9 14 U1 1 U2 12 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 819 EP 836 PG 18 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000009 ER PT J AU Doughty, C Pruess, K AF Doughty, C Pruess, K TI Modeling supercritical carbon dioxide injection in heterogeneous porous media SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID AQUIFERS AB We investigate the physical processes that occur during the sequestration of CO2 in liquid-saturated, brine-bearing geologic formations using the numerical simulator TOUGH2. Carbon dioxide is injected in a supercritical state that has a much lower density and viscosity than the liquid brine it displaces. In situ, the supercritical CO2 forms a gas-like phase, and also partially dissolves in the aqueous phase, creating a multiphase, multicomponent environment that shares many important features with the vadose zone. The flow and transport simulations employ an equation of state package that treats a two-phase (liquid, gas), three-component (water, salt, CO2) system. Chemical reactions between CO2 and rock minerals that could potentially contribute to mineral trapping of CO2 are not included. The geological setting considered is a fluvial/deltaic formation that is strongly heterogeneous, making preferential flow a significant effect, especially when coupled with the strong buoyancy forces acting on the gas-like CO2 plume. Key model development issues include vertical and lateral grid resolution, grid orientation effects, and the choice of characteristic curves. C1 EO Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Doughty, C (reprint author), EO Lawrence Berkeley Natl Lab, Div Earth Sci, 1 Cyclotron Rd,MS 90-1116, Berkeley, CA 94720 USA. EM cadoughty@lbl.gov RI meng, xin/G-3553-2011; Doughty, Christine/G-2389-2015 NR 20 TC 111 Z9 113 U1 0 U2 25 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 837 EP 847 PG 11 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000010 ER PT J AU Oldenburg, CM Unger, AJA AF Oldenburg, CM Unger, AJA TI Coupled vadose zone and atmospheric surface-layer transport of carbon dioxide from geologic carbon sequestration sites SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID DISPERSION; CO2 AB Geologic CO2 sequestration is being considered as a way to offset fossil fuel-related CO2 emissions to reduce the rate of increase of atmospheric CO2 concentrations. The accumulation of vast quantities injected CO2 in geologic sequestration sites may entail health and risks from potential leakage and seepage of CO2 into the near-surface environment. We are developing and applying a subsurface and atmospheric surface-layer modeling capability built within the framework of the integral finite difference reservoir simulator TOUGH2. The overall purpose of the modeling studies is to predict CO2 concentration distributions under a variety of seepage scenarios and geologic, hydrologic, and atmospheric conditions. These concentration distributions will provide the basis for determining above-ground and near-surface instrumentation needs for CO2 sequestration monitoring and verification, as well as for assessing health, safety, and environmental risks. A key feature of CO2 is its large density (rho = 1.8 kg m(-3)) relative to air (rho = 1.2 kg m(-3)), a property that may allow small leaks to cause concentrations in air above the occupational exposure limit of 4% in low-lying and enclosed areas such as valleys and basements where dilution rates are low. The approach we take to coupled modeling involves development of T2CA, a TOUGH2 module for modeling the multicomponent transport of water, brine, CO2, gas tracer, and air in the subsurface. For the atmospheric surfac-layer advection and dispersion, we use a logarithmic vertical velocity profile to specify constant time-averaged ambient winds, and atmospheric dispersion approaches to model mixing due to eddies and turbulence. Initial simulations with the coupled model suggest that dispersion quickly dilutes diffuse CO2 seepage fluxes to negligible concentrations, and that rainfall infiltration can cause CO2 to return to the subsurface as a dissolved component in infiltrating rainwater. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada. RP Oldenburg, CM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM cmoldenburg@lbl.gov RI Oldenburg, Curtis/L-6219-2013 OI Oldenburg, Curtis/0000-0002-0132-6016 NR 23 TC 45 Z9 46 U1 1 U2 18 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 848 EP 857 PG 10 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000011 ER PT J AU Zhang, YQ Oldenburg, CM Benson, SM AF Zhang, YQ Oldenburg, CM Benson, SM TI Vadose zone remediation of carbon dioxide leakage from geologic carbon dioxide sequestration sites SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID NONAQUEOUS PHASE LIQUIDS; HORIZONTAL WELLS; GAS-FLOW; STEAM INJECTION; VAPOR FLOW; SUBSURFACE; EXTRACTION; DISPOSAL; REMOVAL; AQUIFER AB In the unlikely event that CO2 leakage from deep geologic CO2 sequestration sites reaches the vadose zone, remediation measures for removing the CO2 gas plume may have to be undertaken. Carbon leakage plumes are similar in many ways to volatile organic compound (VOC) vapor plumes, and the same remediation approaches are applicable.. We present here numerical simulation results of passive and active remediation strategies for CO2 leakage plumes in the vadose zone. The starting time for the remediation scenarios is assumed to be after a steady-state CO2 leakage plume is established in the vadose zone, and the source of this plume has been cut off. We consider first passive remediation, both with and without barometric pumping. Next, we consider active methods involving extraction wells in both vertical and horizontal configurations. To compare the effectiveness of the various remediation strategies, we define a half-life of CO2 plume as a convenient measure of the CO2 removal rate. For CO2 removal by passive remediation approaches such as barometric pumping, thicker vadose zones generally require longer remediation However, for the case of a thin vadose zone where a significant of the CO2 plume mass resides within the high liquid saturation region near the water table, the half-life of the CO2 plume without barometric pumping is longer than for somewhat thicker vadose zones. As for active strategies, results show that a combination of horizontal and vertical wells is the most effective among the strategies investigated, as the performance of commonly used multiple vertical wells was not investigated. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Zhang, YQ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM yqzhang@lbl.gov RI Oldenburg, Curtis/L-6219-2013; Zhang, Yingqi/D-1203-2015 OI Oldenburg, Curtis/0000-0002-0132-6016; NR 18 TC 19 Z9 19 U1 1 U2 9 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 858 EP 866 PG 9 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000012 ER PT J AU Kim, J Schwartz, FW Xu, TF Choi, H Kim, IS AF Kim, J Schwartz, FW Xu, TF Choi, H Kim, IS TI Coupled processes of fluid flow, solute transport, and geochemical reactions in reactive barriers SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab AB A complex pattern of coupling between fluid flow and mass transport develops when heterogeneous reactions occur. For instance, dissolution and precipitation reactions can change a porous medium's physical properties, such as pore geometry and thus permeability. These changes influence fluid flow, which in turn impacts the composition of dissolved constituents and the solid phases, and the rate and direction of advective transport. Two-dimensional modeling studies using TOUGHREACT were conducted to investigate the coupling between flow and transport developed as a consequence of differences in density, dissolution-precipitation, and medium heterogeneity. The model includes equilibrium reactions for aqueous species, kinetic reactions between the solid phases and aqueous constituents, and full coupling of porosity and permeability changes resulting from precipitation and dissolution reactions in porous media. In addition, a new permeability relationship is implemented in TOUGHREACT to examine the effects of geochemical reactions and density difference on plume migration in porous media. Generally, the evolutions in the concentrations of the aqueous phase are intimately related to the reaction-front dynamics. Plugging of the medium contributed to significant transients in patterns of flow and mass transport. C1 Korea Water Resources Corp, Inst Water & Environm, Taejon, South Korea. Ohio State Univ, Dept Geol Sci, Columbus, OH 43210 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. Kwangju Inst Sci & Technol, Dept Environm Sci & Engn, Kwangju, South Korea. RP Korea Water Resources Corp, Inst Water & Environm, Taejon, South Korea. EM jkkim@kowaco.or.kr NR 13 TC 2 Z9 2 U1 0 U2 3 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 867 EP 874 PG 8 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000013 ER PT J AU Zhou, QL Birkholzer, JT Javandel, I Jordan, PD AF Zhou, QL Birkholzer, JT Javandel, I Jordan, PD TI Modeling three-dimensional groundwater flow and advective contaminant transport at a heterogeneous mountainous site in support of remediation SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID YUCCA MOUNTAIN; REPOSITORY AB A calibrated groundwater flow model for a contaminated site can provide substantial information for assessing and improving hydraulic measures implemented for remediation. We developed a three-dimensional transient groundwater flow model for a contaminated mountainous site at which interim corrective measures were initiated to limit further spreading of contaminants. This flow model accounts for complex geologic units that vary considerably in thickness, slope, and hydrogeologic properties, as well as large seasonal fluctuations of the groundwater table and flow rates. Other significant factors are local recharge from leaking underground storm drains and recharge from steep uphill areas. The zonation method was employed to account for the clustering of high and low hydraulic conductivities measured in a geologic unit. A composite model was used to represent the bulk effect of thin layers of relatively high hydraulic conductivity found within bedrock of otherwise low conductivity. The inverse simulator iTOUGH2 was used to calibrate the model for the distribution of rock properties. The model was initially calibrated using data collected between 1994 and 1996. To check the validity of the model, it was subsequently applied to predicting groundwater level fluctuation and groundwater flux between 1996 and 1998. Comparison of simulated and measured data demonstrated that the model is capable of predicting the complex flow reasonably well. Advective transport was approximated using pathways of particles originating from source areas of the plumes. The advective transport approximation was in good agreement with the trend of contaminant plumes observed during the same years. The validated model was then refined to focus on a subsection of the large system. The refined model showed that most the hydraulic measures implemented for remediation are effective. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Zhou, QL (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. EM qlzhou@lbl.gov RI Zhou, Quanlin/B-2455-2009; Birkholzer, Jens/C-6783-2011; OI Zhou, Quanlin/0000-0001-6780-7536; Birkholzer, Jens/0000-0002-7989-1912; Jordan, Preston/0000-0001-5853-9517 NR 21 TC 3 Z9 4 U1 0 U2 1 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 884 EP 900 PG 17 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000015 ER PT J AU Gallagher, PM Finsterle, S AF Gallagher, PM Finsterle, S TI Physical and numerical model of colloidal silica injection for passive site stabilization SO VADOSE ZONE JOURNAL LA English DT Article; Proceedings Paper CT TOUGH Symposium 2003 CY MAY, 2003 CL Lawrence Berkeley Natl Lab, Berkeley, CA HO Lawrence Berkeley Natl Lab ID SAND AB Passive site stabilization is a new technology proposed for nondisruptive mitigation of liquefaction risk at developed sites susceptible to liquefaction. This technology is based on the concept of slow injection of stabilizing materials at the edge of a site and delivery of the to the target location by using the natural or augmented groundwater flow. In this research, a box model was used to investigate the ability to uniformly deliver colloidal silica stabilizer to loose sands low-head injection and extraction wells. Five injection wells and two extraction wells were used to deliver stabilizer in a generally uniform pattern to the loose sand formation. Numerical modeling was used to identify the key parameters affecting stabilizer migration and to determine their effective values for the box experiment. In our modeling approach, the stabilizer is treated as a miscible fluid, the viscosity of which is a function of time and the concentration of stabilizer in the pore water. Inverse modeling techniques are employed reproduce data from the laboratory experiment for the determination of soil and stabilizer properties. While the details of the stabilizer were difficult to reproduce with the simplified conceptual model we used, the overall system behavior was well captured, providing confidence that numerical simulation is a useful tool for designing centrifuge model tests, pilot tests, and eventually field stabilizer-injection projects. C1 Drexel Univ, Dept Civil Environm & Architectural Engn, Philadelphia, PA 19104 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Gallagher, PM (reprint author), Drexel Univ, Dept Civil Environm & Architectural Engn, 3141 Chestnut St, Philadelphia, PA 19104 USA. EM pmg@drexel.edu RI Finsterle, Stefan/A-8360-2009 OI Finsterle, Stefan/0000-0002-4446-9906 NR 21 TC 6 Z9 7 U1 0 U2 2 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 917 EP 925 PG 9 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000018 ER PT J AU Williamson, TN Newman, BD Graham, RC Shouse, PJ AF Williamson, TN Newman, BD Graham, RC Shouse, PJ TI Regolith water in zero-order chaparral and perennial grass watersheds four decades after vegetation conversion SO VADOSE ZONE JOURNAL LA English DT Article ID SOUTHERN-CALIFORNIA; ENVIRONMENTAL TRACERS; RECHARGE; MOVEMENT AB In 1960, areas of chaparral were converted to perennial grass after a fire burned most of the San Dimas Experimental Forest in southern California. This conversion provided an opportunity to compare regolith moisture patterns of zero-order watersheds under native chaparral with those under nonnative veldt grass ( Ehrharta calycina Sm.). We collected data as a function of vegetation type and watershed element to test the hypothesis that conversion from chaparral to grass altered water distribution in the vadose zone as a result of changes in the physical environment, including rooting depth and soil horizonation. Patterns in vadose zone water distribution during the dry season, including soil water potential and residual flux, were significantly different in converted areas, reflecting the different rooting habits of the two vegetation types. In chaparral areas, there was no significant change in soil water potential between the surface and the 150-cm depth; soil water potential was consistently below - 1.5 MPa, reflecting the extensive root system. In grass areas, soil water potential was most negative close to the surface, where grass roots were most abundant. Plant available water was present below the 100-cm depth, that recharge to groundwater may occur under grass in average or wetter years. Under both vegetation types, the largest differences in residual water fluxes were near the soil - weathered rock contact. However, there was a significant relation between minor differences in fluxes and soil horizon boundaries, confirming the effects of vegetation conversion on soil properties and vadose zone soil water. C1 Univ Pacific, Dept Geosci, Stockton, CA 95211 USA. Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA. Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA. ARS, USDA, US Salin Lab, Riverside, CA 92507 USA. RP Williamson, TN (reprint author), Univ Pacific, Dept Geosci, Stockton, CA 95211 USA. EM twilliam@pacific.edu NR 47 TC 10 Z9 10 U1 0 U2 4 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD AUG PY 2004 VL 3 IS 3 BP 1007 EP 1016 PG 10 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BB UT WOS:000227469000027 ER PT J AU Liew, CK Smith, BT Pilpa, R Suree, N Ilangovan, U Connolly, KM Jung, ME Clubb, RT AF Liew, CK Smith, BT Pilpa, R Suree, N Ilangovan, U Connolly, KM Jung, ME Clubb, RT TI Localization and mutagonesis of the sorting signal binding site on sortase A from Staphylococcus aureus SO FEBS LETTERS LA English DT Article DE sortase; cell wall; inhibitor; NMR ID GRAM-POSITIVE BACTERIA; PROTEIN ANCHORING TRANSPEPTIDASE; IMIDAZOLIUM ION-PAIR; CELL-WALL; SURFACE-PROTEINS; LISTERIA-MONOCYTOGENES; LPXTG MOTIF; SRTA GENE; IN-VITRO; PATHOGENESIS AB Surface proteins in Gram-positive bacteria are anchored to the cell wall by the action of sortase enzymes. The Staphylococcus aureus sortase A (SrtA) protein anchors proteins by recognizing a cell wall sorting signal containing the amino acid sequence LPXTG. To understand how SrtA binds this sequence, we carried out NMR studies of new peptidyl-cyanoalkene and peptidyl-sulfhydryl inhibitors that contain the sorting signal sequence LPAT. These studies combined with amino acid mutagenesis identified a catalytically important and conserved binding surface formed by residues A118, T180, and I182. Compatible with its recently proposed role as a general base, R197 is also shown to be required for catalysis. (C) 2004 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies. C1 Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, US DOE, Inst Genom & Proteom, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Inst Mol Biol, Los Angeles, CA 90095 USA. RP Clubb, RT (reprint author), Univ Calif Los Angeles, Dept Chem & Biochem, 405 Hilgard Ave, Los Angeles, CA 90095 USA. EM jung@chem.ucla.edu; rclubb@mbi.ucla.edu RI Liew, Chu Kong/H-1437-2011 FU NIAID NIH HHS [AI 52217-01] NR 32 TC 32 Z9 33 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD JUL 30 PY 2004 VL 571 IS 1-3 BP 221 EP 226 DI 10.1016/j.febslet.2004.04.070 PG 6 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 843OX UT WOS:000223094600039 PM 15280046 ER PT J AU Lee, MJ McCabe, C Cummings, PT AF Lee, MJ McCabe, C Cummings, PT TI Square-well chain molecules: a semi-empirical equation of state and Monte Carlo simulation data SO FLUID PHASE EQUILIBRIA LA English DT Article DE square well; simulation; equation of state; SAFT-VR ID DIRECTIONAL ATTRACTIVE FORCES; ASSOCIATING FLUID THEORY; THERMODYNAMIC PERTURBATION-THEORY; ENSEMBLE COMPUTER-SIMULATION; HARD-SPHERE MOLECULES; ANALYTIC EQUATION; VARIABLE RANGE; BULK EQUATION; DYNAMICS SIMULATION; DENSITY PROFILES AB A semi-empirical equation of state was developed for square-well chain fluids on the basis of Monte Carlo (MC) simulation data. The equation was formed by combining terms describing non-bonded square-well segments, hard-sphere chain formation, and a perturbation term describing the square-well contribution to chain formation. The functional dependence on the chain length is the same as that derived in the statistical associating fluid theory (SAFT). Extensive isobaric-isothermal MC simulations were performed for the dimer, 4-mer, 8-mer, and 16-mer square-well fluids at temperatures below or near the critical point. The new equation satisfactorily represents the volumetric properties of square-well chain fluids, up to and including the 100-mer, which was the longest chain length studied. Additionally, the new model accurately reproduces the phase envelopes of the dimer and 4-mer fluids, however, it underestimates the vapor pressures for 8-mer's and above. (C) 2004 Elsevier B.V. All rights reserved. C1 Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 10607, Taiwan. Colorado Sch Mines, Dept Chem Engn, Golden, CO 80401 USA. Vanderbilt Univ, Dept Chem Engn, Nashville, TN 37235 USA. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. RP Lee, MJ (reprint author), Natl Taiwan Univ Sci & Technol, Dept Chem Engn, 43 Keelung Rd,Sect 4, Taipei 10607, Taiwan. EM mjl@ch.ntust.edu.tw RI McCabe, Clare/I-8017-2012; Cummings, Peter/B-8762-2013 OI McCabe, Clare/0000-0002-8552-9135; Cummings, Peter/0000-0002-9766-2216 NR 49 TC 13 Z9 14 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD JUL 30 PY 2004 VL 221 IS 1-2 BP 63 EP 72 DI 10.1016/j.fluid.2004.03.008 PG 10 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA 843OU UT WOS:000223094300009 ER PT J AU Akins, JA Luo, SN Asimow, PD Ahrens, TJ AF Akins, JA Luo, SN Asimow, PD Ahrens, TJ TI Shock-induced melting of MgSiO3 perovskite and implications for melts in Earth's lowermost mantle SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PHASE-TRANSITION; THERMOELASTIC PROPERTIES; CRYSTAL-STRUCTURE; HIGH-PRESSURES; DENSE LAYER; EQUATION; STATE; TEMPERATURES; CONSTRAINTS; DIFFRACTION AB New shock wave equation of state (EOS) data for enstatite and MgSiO3 glass constrain the density change upon melting of Mg-silicate perovskite up to 200 GPa. The melt becomes denser than perovskite near the base of Earth's lower mantle. This inference is confirmed by shock temperature data suggesting a negative pressure-temperature slope along the melting curve at high pressure. Although melting of Earth's mantle involves multiple phases and chemical components, this implies that the partial melts invoked to explain anomalous seismic velocities in the lowermost mantle may be dynamically stable. C1 CALTECH, Dept Geol & Planetary Sci, Pasadena, CA 91125 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Akins, JA (reprint author), CALTECH, Dept Geol & Planetary Sci, Mail Code 170-25, Pasadena, CA 91125 USA. EM asimow@gps.caltech.edu RI Asimow, Paul/E-7451-2010; Luo, Sheng-Nian /D-2257-2010 OI Asimow, Paul/0000-0001-6025-8925; Luo, Sheng-Nian /0000-0002-7538-0541 NR 35 TC 45 Z9 49 U1 0 U2 19 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 30 PY 2004 VL 31 IS 14 AR L14612 DI 10.1029/2004GL020237 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 844UE UT WOS:000223185300004 ER PT J AU Chigaev, A Zwartz, GJ Buranda, T Edwards, BS Prossnitz, ER Sklar, LA AF Chigaev, A Zwartz, GJ Buranda, T Edwards, BS Prossnitz, ER Sklar, LA TI Conformational regulation of alpha(4)beta(1)-integrin affinity by reducing agents - "Inside-out" signaling is independent of and additive to reduction-regulated integrin activation SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID PROTEIN DISULFIDE-ISOMERASE; T-CELL MIGRATION; CYTOPLASMIC DOMAIN; BETA(3) INTEGRINS; RECEPTOR SUBTYPES; ADHESION; BINDING; PHOSPHORYLATION; EXPRESSION; DISRUPTION AB The alpha(4)beta(1)-integrin (very late antigen-4 (VLA-4), CD49d/CD29) is an adhesion receptor involved in the interaction of lymphocytes, dendritic cells, and stem cells with the extracellular matrix and endothelial cells. This and other integrins have the ability to regulate their affinity for ligands through a process termed "inside-out" signaling that affects cell adhesion avidity. Several mechanisms are known to regulate integrin affinity and conformation: conformational changes induced by separation of the C-terminal tails, divalent ions, and reducing agents. Recently, we described a fluorescent LDV-containing small molecule that was used to monitor VLA-4 affinity changes in live cells (Chigaev, A., Blenc, A. M., Braaten, J. V., Kumaraswamy, N., Kepley, C. L., Andrews, R. P., Oliver, J. M., Edwards, B. S., Prossnitz, E. R., Larson, R. S., and Sklar, L. A. (2001) J. Biol. Chem. 276, 48670-48678). Using the same molecule, we also developed a fluorescence resonance energy transfer-based assay to probe the "switchblade-like" opening of VLA-4 upon activation. Here, we investigated the effect of reducing agents on the affinity and conformational state of the VLA-4 integrin simultaneously with cell activation initiated by inside-out signaling through G protein-coupled receptors or Mn2+ in live cells in real time. We found that reducing agents ( dithiothreitol and 2,3-dimercapto-1-propanesulfonic acid) induced multiple states of high affinity of VLA-4, where the affinity change was accompanied by an extension of the integrin molecule. Bacitracin, an inhibitor of the reductive function of the plasma membrane, diminished the effect of dithiothreitol, but had no effect on inside-out signaling. Based on this result and differences in the kinetics of integrin activation, we conclude that conformational activation of VLA-4 by inside-out signaling is independent of and additive to reduction-regulated integrin activation. C1 Univ New Mexico, Hlth Sci Ctr, Dept Pathol, Albuquerque, NM 87131 USA. Univ New Mexico, Hlth Sci Ctr, Ctr Canc, Albuquerque, NM 87131 USA. Univ New Mexico, Hlth Sci Ctr, Dept Cell Biol & Physiol, Albuquerque, NM 87131 USA. Los Alamos Natl Lab, Natl Flow Cytometry Resource, Los Alamos, NM 87545 USA. RP Sklar, LA (reprint author), Univ New Mexico, Hlth Sci Ctr, Dept Pathol, Albuquerque, NM 87131 USA. EM lsklar@salud.unm.edu RI Chigaev, Alexandre/A-3103-2010; Prossnitz, Eric/B-4543-2008; OI Chigaev, Alexandre/0000-0002-7726-638X; Prossnitz, Eric/0000-0001-9190-8302 FU NCI NIH HHS [1R24 CA88339]; NHLBI NIH HHS [P50 HL56384]; NIBIB NIH HHS [1R01EB02022] NR 51 TC 42 Z9 43 U1 0 U2 3 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 JUL 30 PY 2004 VL 279 IS 31 BP 32435 EP 32443 DI 10.1074/jbc.M404387200 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 840HW UT WOS:000222849700057 PM 15166232 ER PT J AU Hilder, EF Svec, F Frechet, JM AF Hilder, EF Svec, F Frechet, JM TI Development and application of polymeric monolithic stationary phases for capillary electrochromatography SO JOURNAL OF CHROMATOGRAPHY A LA English DT Review DE reviews; monolithic columns; electrochromatography; stationary phases; electrochromatography; proteins; peptides; saccharides ID PERFORMANCE LIQUID-CHROMATOGRAPHY; CHARGED POLYACRYLAMIDE-GELS; MOLECULARLY IMPRINTED POLYMERS; SIZE-EXCLUSION CHROMATOGRAPHY; STEARYL-ACRYLATE MONOLITHS; FRITLESS PACKED-COLUMNS; AMINO-ACID ENANTIOMERS; CONTINUOUS BEDS; SEPARATION MEDIA; REVERSED-PHASE AB Monolithic columns for capillary electrochromatography are receiving quite remarkable attention. This review summarizes results excerpted from numerous papers concerning this rapidly growing area with a focus on monoliths prepared from synthetic polymers. Both the simplicity of the in situ preparation and the large number of readily available chemistries make the monolithic separation media a vital alternative to capillary columns packed with particulate materials. Therefore, they are now a well-established stationary phase format in the field of capillary electrochromatography. A wide variety of synthetic approaches as well as materials used for the preparation of the monolithic stationary phases are presented in detail. The analytical potential of these columns is demonstrated with separations involving various families of compounds and different chromatographic modes. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Svec, F (reprint author), Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. EM svec@berkeley.edu RI Hilder, Emily/A-1001-2009; OI Hilder, Emily/0000-0002-4444-7870; Frechet, Jean /0000-0001-6419-0163 FU NIGMS NIH HHS [GM-48364] NR 128 TC 185 Z9 192 U1 5 U2 55 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD JUL 30 PY 2004 VL 1044 IS 1-2 BP 3 EP 22 DI 10.1016/j.chroma.2004.04.057 PG 20 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 842DV UT WOS:000222984300002 PM 15354426 ER PT J AU Yohannan, S Yang, D Faham, S Boulting, G Whitelegge, J Bowie, JU AF Yohannan, S Yang, D Faham, S Boulting, G Whitelegge, J Bowie, JU TI Proline substitutions are not easily accommodated in a membrane protein SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE bacteriorhodopsin; transmembrane; proline substitutions ID TRANSMEMBRANE ALPHA-HELICES; CHANNEL; BACTERIORHODOPSIN; CONFORMATIONS; STABILITY; RESIDUES; KINKS AB Proline residues are relatively common in transmembrane helices. This suggests that proline substitutions may be readily tolerated in membrane proteins, even though they invariably produce deviations from canonical helical structure. We have experimentally tested this possibility by making proline substitutions at 15 positions throughout the N-terminal half of bacteriorhodopsin helix B. We find that six of the substitutions yielded no active protein and all the others were destabilizing. Three mutations were only slightly destabilizing, however, reducing stability by about 0.5 kcal/mol, and these all occurred close to the N terminus. This result is consistent with the observation that proline is more common near the ends of TM helices. To learn how proline side-chains could be structurally accommodated at different locations in the helix, we solved the structures of a moderately destabilized mutant positioned near the N terminus of the helix, K41P, and a severely destabilized mutant positioned near the middle of the helix, A51P. The K41P mutation produced only local structural alterations, while the A51P mutation resulted in small, but widely distributed structural changes in helix B. Our results indicate that proline is not easily accommodated in transmembrane helices and that the tolerance to proline substitution is dependent, in a complex way, on the position in the structure. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Calif Los Angeles, Inst Mol Biol, DOE Ctr Genom & Proteom, Dept Chem & Biochem, Los Angeles, CA 90095 USA. RP Bowie, JU (reprint author), Univ Calif Los Angeles, Inst Mol Biol, DOE Ctr Genom & Proteom, Dept Chem & Biochem, 655 Boyer Hall,611 Charles E Young Dr E, Los Angeles, CA 90095 USA. EM bowie@mbi.ucla.edu FU NIGMS NIH HHS [R01 GM063919] NR 20 TC 55 Z9 55 U1 1 U2 4 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 JUL 30 PY 2004 VL 341 IS 1 BP 1 EP 6 DI 10.1016/j.jmb.2004.06.025 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 841JC UT WOS:000222925100001 PM 15312757 ER PT J AU Shin, DH Brandsen, J Jancarik, J Yokota, H Kim, R Kim, SH AF Shin, DH Brandsen, J Jancarik, J Yokota, H Kim, R Kim, SH TI Structural analyses of peptide release factor 1 from Thermotoga maritima reveal domain flexibility required for its interaction with the ribosome SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE peptide release factor 1; gi 4981923; crystal structure; ribosome; conformational change ID TRANSFER-RNA HYDROLYSIS; ESCHERICHIA-COLI; FACTOR RF2; TRANSLATION TERMINATION; GGQ MOTIF; PROTEIN; ERF1; CRYSTALLIZATION; CLASSIFICATION; INSIGHTS AB We have determined the crystal structure of peptide chain release factor 1 (RF1) from Thermotoga maritima (gi 4981173) at 2.65 Angstrom resolution by selenomethionine single-wavelength anomalous dispersion (SAD) techniques. RF1 is a protein that recognizes stop codons and promotes the release of a nascent polypeptide from tRNA on the ribosome. Selenomethionine-labeled RF1 crystallized in space group P2(1) with three monomers per asymmetric unit. It has approximate dimensions of 75 A x 70 A x 45 A and is composed of four domains. The overall fold of each RF1 domain shows almost the same topology with Escherichia coli RF2, except that the RF1 N-terminal domain is shorter and the C-terminal domain is longer than that of RF2. The N-terminal domain of RM indicates a rigid-body movement relative to that of RF2 with an angle of similar to 90degrees. Including these features, RF1 has a tripeptide anticodon PVT motif instead of the SPF motif of RF2, which confers the specificity towards the stop codons. The analyses of three molecules in the asymmetric unit and comparison with RF2 revealed the presence of dynamic movement of domains I and III, which are anchored to the central domain by hinge loops. The crystal structure of RF1 elucidates the intrinsic property of this family of having large domain movements for proper function with the ribosome. (C) 2004 Elsevier Ltd. All rights reserved. C1 Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Kim, SH (reprint author), Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. EM shkim@cchem.berkeley.edu FU NIGMS NIH HHS [GM 62412] NR 40 TC 57 Z9 59 U1 0 U2 4 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 JUL 30 PY 2004 VL 341 IS 1 BP 227 EP 239 DI 10.1016/j.jmb.2004.05.055 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 841JC UT WOS:000222925100019 PM 15312775 ER PT J AU Fabijonas, BR Holm, DD AF Fabijonas, BR Holm, DD TI Euler-Poincare formulation and elliptic instability for nth-gradient fluids SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID 3-DIMENSIONAL INSTABILITY; STRAINED VORTICES; STABILITY; FLOWS; GRADE; THERMODYNAMICS; TURBULENCE; EQUATIONS AB The energy of an nth-gradient fluid depends on its Eulerian velocity gradients of order n. A variational principle is introduced for the dynamics of nth-gradient fluids and their properties are reviewed in the context of Noether's theorem. The stability properties of Craik-Criminale solutions for first and second gradient fluids are examined. C1 So Methodist Univ, Dept Math, Dallas, TX 75275 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ London Imperial Coll Sci Technol & Med, Dept Math, London SW7 2AZ, England. RP Fabijonas, BR (reprint author), So Methodist Univ, Dept Math, Dallas, TX 75275 USA. EM bfabi@smu.edu; dholm@lanl.gov OI Holm, Darryl D/0000-0001-6362-9912 NR 30 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD JUL 30 PY 2004 VL 37 IS 30 BP 7609 EP 7623 AR PII S0305-4470(04)76776-1 DI 10.1088/0305-4470/37/30/015 PG 15 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA 847AN UT WOS:000223361100018 ER PT J AU Aubert, B Barate, R Boutigny, D Couderc, F Gaillard, JM Hicheur, A Karyotakis, Y Lees, JP Robbe, P Tisserand, V Zghiche, A Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G LeClerc, C Levi, ME Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Romosan, A Ronan, MT Shelkov, VG Telnov, AV Wenzel, WA Ford, K Harrison, TJ Hawkes, CM Knowles, DJ Morgan, SE Penny, RC Watson, AT Watson, NK Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Peters, K Schmuecker, H Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Mackay, C Wilson, FF Abe, K Cuhadar-Donszelmann, T Hearty, C Mattison, TS McKenna, JA Thiessen, D Kyberd, P McKemey, AK Teodorescu, L Blinov, VE Bukin, AD Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Gary, JW Layter, J Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Dahmes, B Levy, SL Long, O Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Beringer, J Eisner, AM Heusch, CA Lockman, WS Schalk, T Schmitz, RE Schumm, BA Seiden, A Spradlin, P Turri, M Walkowiak, W Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Erwin, RJ Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Abe, T Blanc, F Bloom, P Chen, S Clark, PJ Ford, WT Nauenberg, U Olivas, A Rankin, P Roy, J Smith, JG van Hoek, WC Zhang, L Harton, JL Hu, T Soffer, A Toki, WH Wilson, RJ Zhang, J Altenburg, D Brandt, T Brose, J Colberg, T Dickopp, M Dubitzky, RS Hauke, A Lacker, HM Maly, E Muller-Pfefferkorn, R Nogowski, R Otto, S Schubert, J Schubert, KR Schwierz, R Spaan, B Wilden, L Bernard, D Bonneaud, GR Brochard, F Cohen-Tanugi, J Grenier, P Thiebaux, C Vasileiadis, G Verderi, M Khan, A Lavin, D Muheim, F Playfer, S Swain, JE Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Piemontese, L Sarti, A Treadwell, E Baldini-Ferroli, R Calcaterra, A de Sangro, R Falciai, D Finocchiaro, G Patteri, P Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Morii, M Won, E Bhimji, W Bowerman, DA Dauncey, PD Egede, U Eschrich, I Gaillard, JR Morton, GW Nash, JA Taylor, GP Grenier, GJ Lee, SJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Yi, J Davier, M Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Brigljevic, V Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Coleman, JP Fry, JR Gabathuler, E Gamet, R Kay, M Parry, RJ Payne, DJ Sloane, RJ Touramanis, C Back, JJ Harrison, PF Shorthouse, HW Vidal, PB Brown, CL Cowan, G Flack, RL Flaecher, HU George, S Green, MG Kurup, A Marker, CE McMahon, TR Ricciardi, S Salvatore, F Vaitsas, G Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hart, PA Hodgkinson, MC Jackson, F Lafferty, GD Lyon, AJ Weatherall, JH Williams, JC Farbin, A Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote-Ahern, D Taras, P Nicholson, H Cartaro, C Cavallo, N De Nardo, G Fabozzi, F Gatto, C Lista, L Paolucci, P Piccolo, D Sciacca, C Baak, MA Raven, G LoSecco, JM Gabriel, TA Brau, B Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Ocariz, J Pivk, M Roos, L Stark, J T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Anulli, F Biasini, M Peruzzi, IM Pioppi, M Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Del Gamba, V Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lu, C Miftakov, V Olsen, J Smith, AJS Tanaka, HA Varnes, EW Bellini, F Cavoto, G Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Xella, SM Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Langer, M Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Yumiceva, FX Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Convery, MR Cristinziani, M Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Field, RC Glanzman, T Gowdy, SJ Grauges-Pous, E Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Jessop, CP Kelsey, MH Kim, P Kocian, ML Langenegger, U Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wright, DH Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Borean, C Bosisio, L Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Band, HR Dasu, S Datta, M Eichenbaum, AM Johnson, JR Kutter, PE Li, H Liu, R Di Lodovico, F Mihalyi, A Mohapatra, AK Pan, Y Prepost, R Sekula, SJ von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Neal, H AF Aubert, B Barate, R Boutigny, D Couderc, F Gaillard, JM Hicheur, A Karyotakis, Y Lees, JP Robbe, P Tisserand, V Zghiche, A Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G LeClerc, C Levi, ME Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Romosan, A Ronan, MT Shelkov, VG Telnov, AV Wenzel, WA Ford, K Harrison, TJ Hawkes, CM Knowles, DJ Morgan, SE Penny, RC Watson, AT Watson, NK Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Peters, K Schmuecker, H Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Mackay, C Wilson, FF Abe, K Cuhadar-Donszelmann, T Hearty, C Mattison, TS McKenna, JA Thiessen, D Kyberd, P McKemey, AK Teodorescu, L Blinov, VE Bukin, AD Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Gary, JW Layter, J Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Dahmes, B Levy, SL Long, O Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Beringer, J Eisner, AM Heusch, CA Lockman, WS Schalk, T Schmitz, RE Schumm, BA Seiden, A Spradlin, P Turri, M Walkowiak, W Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Erwin, RJ Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Abe, T Blanc, F Bloom, P Chen, S Clark, PJ Ford, WT Nauenberg, U Olivas, A Rankin, P Roy, J Smith, JG van Hoek, WC Zhang, L Harton, JL Hu, T Soffer, A Toki, WH Wilson, RJ Zhang, J Altenburg, D Brandt, T Brose, J Colberg, T Dickopp, M Dubitzky, RS Hauke, A Lacker, HM Maly, E Muller-Pfefferkorn, R Nogowski, R Otto, S Schubert, J Schubert, KR Schwierz, R Spaan, B Wilden, L Bernard, D Bonneaud, GR Brochard, F Cohen-Tanugi, J Grenier, P Thiebaux, C Vasileiadis, G Verderi, M Khan, A Lavin, D Muheim, F Playfer, S Swain, JE Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Piemontese, L Sarti, A Treadwell, E Baldini-Ferroli, R Calcaterra, A de Sangro, R Falciai, D Finocchiaro, G Patteri, P Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Morii, M Won, E Bhimji, W Bowerman, DA Dauncey, PD Egede, U Eschrich, I Gaillard, JR Morton, GW Nash, JA Taylor, GP Grenier, GJ Lee, SJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Yi, J Davier, M Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Brigljevic, V Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Coleman, JP Fry, JR Gabathuler, E Gamet, R Kay, M Parry, RJ Payne, DJ Sloane, RJ Touramanis, C Back, JJ Harrison, PF Shorthouse, HW Vidal, PB Brown, CL Cowan, G Flack, RL Flaecher, HU George, S Green, MG Kurup, A Marker, CE McMahon, TR Ricciardi, S Salvatore, F Vaitsas, G Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hart, PA Hodgkinson, MC Jackson, F Lafferty, GD Lyon, AJ Weatherall, JH Williams, JC Farbin, A Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote-Ahern, D Taras, P Nicholson, H Cartaro, C Cavallo, N De Nardo, G Fabozzi, F Gatto, C Lista, L Paolucci, P Piccolo, D Sciacca, C Baak, MA Raven, G LoSecco, JM Gabriel, TA Brau, B Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Ocariz, J Pivk, M Roos, L Stark, J T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Anulli, F Biasini, M Peruzzi, IM Pioppi, M Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Del Gamba, V Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lu, C Miftakov, V Olsen, J Smith, AJS Tanaka, HA Varnes, EW Bellini, F Cavoto, G Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Xella, SM Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Langer, M Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Yumiceva, FX Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Convery, MR Cristinziani, M Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Field, RC Glanzman, T Gowdy, SJ Grauges-Pous, E Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Jessop, CP Kelsey, MH Kim, P Kocian, ML Langenegger, U Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wright, DH Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Borean, C Bosisio, L Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Band, HR Dasu, S Datta, M Eichenbaum, AM Johnson, JR Kutter, PE Li, H Liu, R Di Lodovico, F Mihalyi, A Mohapatra, AK Pan, Y Prepost, R Sekula, SJ von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Neal, H CA BaBar Collaboration TI Measurement of branching fractions and charge asymmetries in B-+/-->rho(+/-)pi(0) and B-+/-->rho(0)pi(+/-) decays, and search for B-0 ->rho(0)pi(0) SO PHYSICAL REVIEW LETTERS LA English DT Article ID CP-VIOLATION AB We present measurements of branching fractions and charge asymmetries in B-meson decays to rho(+)pi(0), rho(0)pi(+), and rho(0)pi(0). The data sample comprises 89x10(6) Y(4S)-->B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the charge-averaged branching fractions B(B+-->rho(+)pi(0))=[10.9+/-1.9(stat)+/-1.9(syst)]x10(-6) and B(B+-->rho(0)pi(+))=(9.5+/-1.1+/-0.9)x10(-6), and we set a 90% confidence-level upper limit B(B-0-->rho(0)pi(0))<2.9x10(-6). We measure the charge asymmetries A(CP)(rho+)pi(0)=0.24+/-0.16+/-0.06 and A(CP)(rho0)pi(+)=-0.19+/-0.11+/-0.02. C1 Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. Univ Bari, Dipartimento Fis, I-70126 Bari, Italy. Ist Nazl Fis Nucl, I-70126 Bari, Italy. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Bergen, Inst Phys, N-5007 Bergen, Norway. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany. Univ Bristol, Bristol BS8 1TL, Avon, England. Univ British Columbia, Vancouver, BC V6T 1Z1, Canada. Brunel Univ, Uxbridge UB8 3PH, Middx, England. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA. CALTECH, Pasadena, CA 91125 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. Univ Colorado, Boulder, CO 80309 USA. Colorado State Univ, Ft Collins, CO 80523 USA. Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany. Ecole Polytech, LLR, F-91128 Palaiseau, France. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. Florida A&M Univ, Tallahassee, FL 32307 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy. Ist Nazl Fis Nucl, I-16146 Genoa, Italy. Harvard Univ, Cambridge, MA 02138 USA. Univ London Imperial Coll Sci Technol & Med, London SW7 2BW, England. Univ Iowa, Iowa City, IA 52242 USA. Iowa State Univ, Ames, IA 50011 USA. Lab Accelerateur Lineaire, F-91898 Orsay, France. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Liverpool, Liverpool L69 3BX, Merseyside, England. Univ London, Queen Mary, London E1 4NS, England. Univ London Royal Holloway & Bedford New Coll, Egham TW20 0EX, Surrey, England. Univ Louisville, Louisville, KY 40292 USA. Univ Manchester, Manchester M13 9PL, Lancs, England. Univ Maryland, College Pk, MD 20742 USA. Univ Massachusetts, Amherst, MA 01003 USA. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. McGill Univ, Montreal, PQ H3A 2T8, Canada. Univ Milan, Dipartimento Fis, I-20133 Milan, Italy. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Univ Mississippi, University, MS 38677 USA. Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada. Mt Holyoke Coll, S Hadley, MA 01075 USA. Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy. Ist Nazl Fis Nucl, I-80126 Naples, Italy. Natl Inst Nucl Phys & High Energy Phys, NIKHEF, NL-1009 DB Amsterdam, Netherlands. Univ Notre Dame, Notre Dame, IN 46556 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oregon, Eugene, OR 97403 USA. Univ Padua, Dipartimento Fis, I-35131 Padua, Italy. Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Paris 06, Lab Phys Nucl HE, F-75252 Paris, France. Univ Paris 07, Lab Phys Nucl HE, F-75252 Paris, France. Univ Pavia, Dipartimento Elettron, I-27100 Pavia, Italy. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Perugia, I-06100 Perugia, Italy. Ist Nazl Fis Nucl, I-06100 Perugia, Italy. Univ Pisa, Dipartimento Fis, Scuola Normale Super Pisa, I-56127 Pisa, Italy. Ist Nazl Fis Nucl, I-56127 Pisa, Italy. Prairie View A&M Univ, Prairie View, TX 77446 USA. Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, I-00185 Rome, Italy. Univ Rostock, D-18051 Rostock, Germany. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CEA Saclay, DSM Dapnia, F-91191 Gif Sur Yvette, France. Univ S Carolina, Columbia, SC 29208 USA. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, Stanford, CA 94305 USA. SUNY Albany, Albany, NY 12222 USA. Univ Tennessee, Knoxville, TN 37996 USA. Univ Texas, Austin, TX 78712 USA. Univ Texas, Richardson, TX 75083 USA. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy. Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Vanderbilt Univ, Nashville, TN 37235 USA. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06511 USA. Univ Basilicata, I-85100 Potenza, Italy. Univ Valencia, CSIC, Inst Fis Corpuscular, IFIC, Valencia, Spain. RP Aubert, B (reprint author), Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. RI Saeed, Mohammad Alam/J-7455-2012; Negrini, Matteo/C-8906-2014; Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Bellini, Fabio/D-1055-2009; Neri, Nicola/G-3991-2012; Rotondo, Marcello/I-6043-2012; Sarti, Alessio/I-2833-2012; Peters, Klaus/C-2728-2008; de Groot, Nicolo/A-2675-2009; Cavallo, Nicola/F-8913-2012; Lista, Luca/C-5719-2008; de Sangro, Riccardo/J-2901-2012; Patrignani, Claudia/C-5223-2009; Forti, Francesco/H-3035-2011; crosetti, nanni/H-3040-2011; Kravchenko, Evgeniy/F-5457-2015; Calabrese, Roberto/G-4405-2015; Mir, Lluisa-Maria/G-7212-2015; Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere, Maurizio/J-5049-2012; Grancagnolo, Sergio/J-3957-2015; Lusiani, Alberto/N-2976-2015; Morandin, Mauro/A-3308-2016; Lusiani, Alberto/A-3329-2016; Della Ricca, Giuseppe/B-6826-2013; Di Lodovico, Francesca/L-9109-2016; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; Roe, Natalie/A-8798-2012 OI Saeed, Mohammad Alam/0000-0002-3529-9255; Negrini, Matteo/0000-0003-0101-6963; Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Bellini, Fabio/0000-0002-2936-660X; Neri, Nicola/0000-0002-6106-3756; Rotondo, Marcello/0000-0001-5704-6163; Sarti, Alessio/0000-0001-5419-7951; Peters, Klaus/0000-0001-7133-0662; de Sangro, Riccardo/0000-0002-3808-5455; Patrignani, Claudia/0000-0002-5882-1747; Forti, Francesco/0000-0001-6535-7965; Calabrese, Roberto/0000-0002-1354-5400; Mir, Lluisa-Maria/0000-0002-4276-715X; Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky, Yury/0000-0001-8496-9975; Lo Vetere, Maurizio/0000-0002-6520-4480; Grancagnolo, Sergio/0000-0001-8490-8304; Lusiani, Alberto/0000-0002-6876-3288; Morandin, Mauro/0000-0003-4708-4240; Lusiani, Alberto/0000-0002-6876-3288; Della Ricca, Giuseppe/0000-0003-2831-6982; Di Lodovico, Francesca/0000-0003-3952-2175; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; NR 11 TC 180 Z9 181 U1 0 U2 7 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 JUL 30 PY 2004 VL 93 IS 5 AR 051802 DI 10.1103/PhysRevLett.93.051802 PG 7 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800010 PM 15323685 ER PT J AU Baumgardner, JE Lee, Y Osheroff, DD Hrubesh, LW Poco, JF AF Baumgardner, JE Lee, Y Osheroff, DD Hrubesh, LW Poco, JF TI Interfacial pinning in the superfluid He-3 A-B transition in aerogel SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE AB Continuous-wave NMR studies of He-3 in the presence of 99.3% porosity silica aerogel at 34.0 bars and in a magnetic field of 28.4 mT reveal a first-order phase transition between A-like and B-like superfluid phases on both warming and cooling. NMR spectra show that the phases on warming are the same as the phases on cooling, and the interface between them is found to be strongly pinned, even close to T-c,T-aero. The observed behavior is consistent with spatial variation of pinning strengths within the aerogel. C1 Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Baumgardner, JE (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA. EM jbaumgar@stanford.edu NR 17 TC 5 Z9 5 U1 1 U2 1 PU AMERICAN 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 JUL 30 PY 2004 VL 93 IS 5 AR 055301 DI 10.1103/PhysRevLett.93.055301 PG 4 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800028 ER PT J AU Colgan, J Pindzola, MS Robicheaux, F AF Colgan, J Pindzola, MS Robicheaux, F TI Lattice calculations of the photoionization of Li SO PHYSICAL REVIEW LETTERS LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; ELECTRON-HYDROGEN SCATTERING; PHOTO-DOUBLE-IONIZATION; TRIPLE PHOTOIONIZATION; ATOMIC-HYDROGEN; HELIUM; LITHIUM; THRESHOLD; IMPACT AB Calculations are presented for the double photoionization (with excitation) and triple photoionization of the Li atom. The motion of all three electrons is treated equally by solving the time-dependent Schrodinger equation in nine dimensions. A radial lattice is used to represent three of the nine dimensions, while a coupled channel expansion is used to represent the other six dimensions. Probabilities for photoionization are obtained by t-->infinity projection onto fully antisymmetric spatial and spin functions. Double photoionization cross sections for lithium leaving the ion in the 1s, 2s, and 2p states are presented. Good agreement is found with the measurements of Huang et al. [Phys. Rev. A 59, 3397 (1999)] for the total double photoionization cross section and with the measurements of Wehlitz et al. [Phys. Rev. Lett. 81, 1813 (1998)] for the triple photoionization cross section. C1 Auburn Univ, Dept Phys, Auburn, AL 36849 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Colgan, J (reprint author), Auburn Univ, Dept Phys, Auburn, AL 36849 USA. OI Colgan, James/0000-0003-1045-3858 NR 21 TC 43 Z9 43 U1 0 U2 4 PU AMERICAN 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 JUL 30 PY 2004 VL 93 IS 5 AR 053201 DI 10.1103/PhysRevLett.93.053201 PG 4 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800017 PM 15323692 ER PT J AU Farley, FJM Jungmann, K Miller, JP Morse, WM Orlov, YF Roberts, BL Semertzidis, YK Silenko, A Stephenson, EJ AF Farley, FJM Jungmann, K Miller, JP Morse, WM Orlov, YF Roberts, BL Semertzidis, YK Silenko, A Stephenson, EJ TI New method of measuring electric dipole moments in storage rings SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTICLES; MUON; SEARCH AB A new highly sensitive method of looking for electric dipole moments of charged particles in storage rings is described. The major systematic errors inherent in the method are addressed and ways to minimize them are suggested. It seems possible to measure the muon EDM to levels that test speculative theories beyond the standard model. C1 Yale Univ, Dept Phys, New Haven, CT 06520 USA. Belarusian State Univ, Minsk 220050, Byelarus. Boston Univ, Dept Phys, Boston, MA 02215 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands. Cornell Univ, Newman Lab, Ithaca, NY 14853 USA. Indiana Univ, IUCF, Bloomington, IN 47408 USA. RP Farley, FJM (reprint author), Yale Univ, Dept Phys, New Haven, CT 06520 USA. RI Jungmann, Klaus/A-7142-2010; jungmann, klaus/H-1581-2013; Semertzidis, Yannis K./N-1002-2013 OI jungmann, klaus/0000-0003-0571-4072; NR 21 TC 124 Z9 124 U1 1 U2 3 PU AMERICAN 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 JUL 30 PY 2004 VL 93 IS 5 AR 052001 DI 10.1103/PhysRevLett.93.052001 PG 4 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800012 PM 15323687 ER PT J AU Foord, ME Heeter, RF van Hoof, PAM Thoe, RS Bailey, JE Cuneo, ME Chung, HK Liedahl, DA Fournier, KB Chandler, GA Jonauskas, V Kisielius, R Mix, LP Ramsbottom, C Springer, PT Keenan, FP Rose, SJ Goldstein, WH AF Foord, ME Heeter, RF van Hoof, PAM Thoe, RS Bailey, JE Cuneo, ME Chung, HK Liedahl, DA Fournier, KB Chandler, GA Jonauskas, V Kisielius, R Mix, LP Ramsbottom, C Springer, PT Keenan, FP Rose, SJ Goldstein, WH TI Charge-state distribution and Doppler effect in an expanding photoionized plasma SO PHYSICAL REVIEW LETTERS LA English DT Article ID DIAGNOSTICS; SPECTROSCOPY; GALAXY; POWER; IRON AB The charge state distributions of Fe, Na, and F are determined in a photoionized laboratory plasma using high resolution x-ray spectroscopy. Independent measurements of the density and radiation flux indicate unprecedented values for the ionization parameter xi=20-25 erg cm s(-1) under near steady-state conditions. Line opacities are well fitted by a curve-of-growth analysis which includes the effects of velocity gradients in a one-dimensional expanding plasma. First comparisons of the measured charge state distributions with x-ray photoionization models show reasonable agreement. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Queens Univ Belfast, Dept Phys, APS Div, Belfast BT7 1NN, Antrim, North Ireland. Sandia Natl Labs, Albuquerque, NM USA. Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. RP Foord, ME (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. OI Rose, Steven/0000-0001-6808-6355 NR 21 TC 57 Z9 61 U1 0 U2 3 PU AMERICAN 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 JUL 30 PY 2004 VL 93 IS 5 AR 055002 DI 10.1103/PhysRevLett.93.055002 PG 4 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800026 PM 15323701 ER PT J AU Lindberg, RR Charman, AE Wurtele, JS Friedland, L AF Lindberg, RR Charman, AE Wurtele, JS Friedland, L TI Robust autoresonant excitation in the plasma beat-wave accelerator SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSTABILITY; GENERATION; MODE AB A modified version of the plasma beat-wave accelerator scheme is proposed, based on autoresonant phase locking of the Langmuir wave to the slowly chirped beat frequency of the driving lasers by passage through resonance. Peak electric fields above standard detuning limits seem readily attainable, and the plasma wave excitation is robust to large variations in plasma density or chirp rate. This scheme might be implemented in existing chirped pulse amplification or CO2 laser systems. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Beam Phys, Berkeley, CA 94720 USA. Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel. RP Lindberg, RR (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM RL236@socrates.berkeley.edu RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 NR 21 TC 28 Z9 28 U1 1 U2 3 PU AMERICAN 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 JUL 30 PY 2004 VL 93 IS 5 AR 055001 DI 10.1103/PhysRevLett.93.055001 PG 4 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800025 PM 15323700 ER PT J AU Lopez-Duran, D de Lara-Castells, MP Delgado-Barrio, G Villarreal, P Di Paola, C Gianturco, FA Jellinek, J AF Lopez-Duran, D de Lara-Castells, MP Delgado-Barrio, G Villarreal, P Di Paola, C Gianturco, FA Jellinek, J TI Role of boson-fermion statistics on the Raman spectra of Br-2(X) in helium clusters SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTEGRAL MONTE-CARLO; VIBRATIONAL PREDISSOCIATION; MOLECULE; HE-4; DYNAMICS; ENERGIES; SOLVENT; DROPS; CO AB The role played by the bosonic or fermionic character of He atoms surrounding a Br-2(X) molecule is analyzed through vibrotational Raman spectra simulations. Quantum chemistry-type calculations reveal the spin multiplicity to be chiefly responsible for the drastic difference observed by Grebenev et al. [Science 279, 2083 (1998)] in the rotational structure of molecules embedded in helium droplets. C1 Consejo Super Invest Cient, Inst Matemat & Fis Fundamental, Madrid 28006, Spain. Univ Rome, Dept Chem, I-00185 Rome, Italy. Univ Rome, INFM, I-00185 Rome, Italy. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Villarreal, P (reprint author), Consejo Super Invest Cient, Inst Matemat & Fis Fundamental, Serrano 123, Madrid 28006, Spain. EM p.villarreal@imaff.cfmac.csic.es RI de Lara-Castells, Maria Pilar/C-5846-2014; Villarreal, Pablo/K-2397-2014 OI de Lara-Castells, Maria Pilar/0000-0001-8697-5770; NR 21 TC 44 Z9 44 U1 0 U2 4 PU AMERICAN 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 JUL 30 PY 2004 VL 93 IS 5 AR 053401 DI 10.1103/PhysRevLett.93.053401 PG 4 WC Physics, Multidisciplinary SC Physics GA 842IJ UT WOS:000222996800018 PM 15323693 ER PT J AU Gilbert, B Huang, F Zhang, HZ Waychunas, GA Banfield, JF AF Gilbert, B Huang, F Zhang, HZ Waychunas, GA Banfield, JF TI Nanoparticles: Strained and stiff SO SCIENCE LA English DT Article ID RADIAL-DISTRIBUTION FUNCTIONS; ABSORPTION FINE-STRUCTURE; CDSE NANOCRYSTALS; QUANTUM DOTS; SEMICONDUCTOR CLUSTERS; CADMIUM SELENIDE; CRYSTALLITES; SURFACE; ZNS; RANGE AB Nanoparticles may contain unusual forms of structural disorder that can substantially modify materials properties and thus cannot solely be considered as small pieces of bulk material. We have developed a method to quantify intermediate-range order in 3.4-nanometer-diameter zinc sulfide nanoparticles and show that structural coherence is lost over distances beyond 2 nanometers. The zinc-sulfur Einstein vibration frequency in the nanoparticles is substantially higher than that in the bulk zinc sulfide, implying structural stiffening. This cannot be explained by the observed 1% radial compression and must be primarily due to inhomogeneous internal strain caused by competing relaxations from an irregular surface. The methods developed here are generally applicable to the characterization of nanoscale solids, many of which may exhibit complex disorder and strain. C1 Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Banfield, JF (reprint author), Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA. EM jill@eps.berkeley.edu RI Gilbert, Benjamin/E-3182-2010 NR 26 TC 282 Z9 284 U1 12 U2 107 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 JUL 30 PY 2004 VL 305 IS 5684 BP 651 EP 654 DI 10.1126/science.1098454 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 842GQ UT WOS:000222992100042 PM 15232073 ER PT J AU Shan, ZW Stach, EA Wiezorek, JMK Knapp, JA Follstaedt, DM Mao, SX AF Shan, ZW Stach, EA Wiezorek, JMK Knapp, JA Follstaedt, DM Mao, SX TI Grain boundary-mediated plasticity in nanocrystalline nickel SO SCIENCE LA English DT Article ID MOLECULAR-DYNAMICS SIMULATION; THIN-FILMS; IN-SITU; DEFORMATION; ROTATION; METALS; DISLOCATIONS; BEHAVIOR; ALUMINUM; COPPER AB The plastic behavior of crystalline materials is mainly controlled by the nucleation and motion of lattice dislocations. We report in situ dynamic transmission electron microscope observations of nanocrystalline nickel films with an average grain size of about 10 nanometers, which show that grain boundary-mediated processes have become a prominent deformation mode. Additionally, trapped lattice dislocations are observed in individual grains following deformation. This change in the deformation mode arises from the grain size-dependent competition between the deformation controlled by nucleation and motion of dislocations and the deformation controlled by diffusion-assisted grain boundary processes. C1 Univ Pittsburgh, Dept Mech Engn, Pittsburgh, PA 15261 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. Univ Pittsburgh, Dept Mat Sci & Engn, Pittsburgh, PA 15261 USA. Sandia Natl Labs, Phys & Chem Sci Ctr, Albuquerque, NM 87185 USA. RP Mao, SX (reprint author), Univ Pittsburgh, Dept Mech Engn, 648 Benedum Hall, Pittsburgh, PA 15261 USA. EM smao@engr.pitt.edu RI Stach, Eric/D-8545-2011; Shan, Zhiwei/B-8799-2014 OI Stach, Eric/0000-0002-3366-2153; NR 27 TC 498 Z9 509 U1 38 U2 256 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 JUL 30 PY 2004 VL 305 IS 5684 BP 654 EP 657 DI 10.1126/science.1098741 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 842GQ UT WOS:000222992100043 PM 15286368 ER PT J AU Arp, ZA Cremers, DA Harris, RD Oschwald, DM Parker, GR Wayne, DM AF Arp, ZA Cremers, DA Harris, RD Oschwald, DM Parker, GR Wayne, DM TI Feasibility of generating a useful laser-induced breakdown spectroscopy plasma on rocks at high pressure: preliminary study for a Venus mission SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article DE laser-induced breakdown spectroscopy; LIBS; Venus; high pressure ID REDUCED PRESSURE; CARBON-DIOXIDE; EXPLORATION; ABSORPTION; ATMOSPHERE; EMISSION; ABLATION; METALS; ROVERS; LIBS AB Laser-induced breakdown spectroscopy (LIBS) is being developed for future use on landers and rovers to Mars. The method also has potential for use on probes to other planets, the Moon, asteroids and comets. Like Mars, Venus is of strong interest because of its proximity to earth, but unlike Mars, conditions at the surface are far more hostile with temperatures in excess of 700 K and pressures on the order of 9.1 MPa (90 atm). These conditions present a significant challenge to spacecraft design and demand that rapid methods of chemical data gathering be implemented. The advantages of LIBS (e.g. stand-off and very rapid analysis) make the method particularly attractive for Venus exploration because of the expected short operational lifetimes ( approximate to 2 h) of surface instrumentation. Although the high temperature of Venus should pose no problem to the analytical capabilities of the LIBS spark, the demonstrated strong dependence of laser plasma characteristics on ambient gas pressures below earth atmospheric pressure requires that LIBS measurements be evaluated at the high Venus surface pressures. Here, we present a preliminary investigation of LIBS at 9.1 MPa for application to the analysis of a basalt rock sample. The results suggest the feasibility of the method for a Venus surface probe and that further study is justified. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Grp CADI, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Grp NMT15, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Grp DX2, Los Alamos, NM 87545 USA. RP Cremers, DA (reprint author), Los Alamos Natl Lab, Grp CADI, Los Alamos, NM 87545 USA. EM cremers_david@lanl.gov NR 32 TC 45 Z9 46 U1 2 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD JUL 30 PY 2004 VL 59 IS 7 BP 987 EP 999 DI 10.1016/j.sab.2004.05.004 PG 13 WC Spectroscopy SC Spectroscopy GA 847JL UT WOS:000223388400008 ER PT J AU Jobic, H Skoulidas, AI Sholl, DS AF Jobic, H Skoulidas, AI Sholl, DS TI Determination of concentration dependent transport diffusivity of CF4 in silicalite by neutron scattering experiments and molecular dynamics SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID ATOMISTIC SIMULATIONS; ZEOLITES; EQUILIBRIUM; MIXTURES AB We have used quasi-elastic neutron scattering to determine the concentration-dependent corrected and transport diffusivities for CF4 adsorbed in silicalite at 200 and 250 K. Equilibrium molecular dynamics simulations have also been used to compute the diffusivities under the same condition. We find quantitative agreement between our simulation and experimental results, which show that the corrected diffusivity of CF4 decreases as the molecular loading inside the zeolite is increased. Earlier simulations and experiments have examined self-diffusion of CF4 in silicalite, so for the first time data are now available to directly compare experimental and MD results for self-diffusion and collective diffusion simultaneously. The agreement between the simulation and experimental results provide strong support for the use of atomistic simulations to quantitatively explore the diffusion of small molecules in nanoporous materials. C1 Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France. Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA. RP Sholl, DS (reprint author), Inst Rech Catalyse, CNRS, 2 Ave Albert Einstein, F-69626 Villeurbanne, France. EM sholl@andrew.cmu.edu NR 21 TC 37 Z9 40 U1 1 U2 9 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 JUL 29 PY 2004 VL 108 IS 30 BP 10613 EP 10616 DI 10.1021/jp048461k PG 4 WC Chemistry, Physical SC Chemistry GA 840MY UT WOS:000222864200001 ER PT J AU Uetsuka, H Onishi, H Henderson, MA White, JM AF Uetsuka, H Onishi, H Henderson, MA White, JM TI Photoinduced redox reaction coupled with limited electron mobility at metal oxide surface SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID SCANNING-TUNNELING-MICROSCOPY; TIO2 110; TIO2(110); PHOTOCATALYSIS; SEMICONDUCTOR AB Photoinduced oxidation of trimethyl acetate (TMA) was examined on an atomically flat surface of rutile TiO2. The macroscopic rate of reaction (the partial pressure of desorption products) was temporary modulated when a TMA-covered surface was UV-irradiated in oxygen gas. Scanning tunneling microscope imaging revealed spatially modulated distribution of TMA and OH on that surface. The limited surface mobility of electrons photoexcited and trapped at OH-associated Ti sites was proposed to cause the temporal and spatial modulations. The characteristic length of the spatial modulation, i.e., the lateral dimension of electron confinement, was a few lattice constants of the oxide. C1 Kanagawa Acad Sci & Technol, Surface Chem Lab, KSP, Kawasaki, Kanagawa 2130012, Japan. Pacific NW Natl Lab, Interfacial Chem & Engn Grp, Richland, WA 99352 USA. RP Onishi, H (reprint author), Kobe Univ, Fac Sci, Dept Chem, Kobe, Hyogo 6578501, Japan. EM oni@kobe-u.ac.jp NR 23 TC 44 Z9 45 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD JUL 29 PY 2004 VL 108 IS 30 BP 10621 EP 10624 DI 10.1021/jp0484027 PG 4 WC Chemistry, Physical SC Chemistry GA 840MY UT WOS:000222864200003 ER PT J AU Ivanov, SA Nanda, J Piryatinski, A Achermann, M Balet, LP Bezel, IV Anikeeva, PO Tretiak, S Klimov, VI AF Ivanov, SA Nanda, J Piryatinski, A Achermann, M Balet, LP Bezel, IV Anikeeva, PO Tretiak, S Klimov, VI TI Light amplification using inverted core/shell nanocrystals: Towards lasing in the single-exciton regime SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID SEMICONDUCTOR QUANTUM DOTS; STIMULATED-EMISSION; OPTICAL-PROPERTIES; CDSE; CDS/HGS/CDS; SYSTEM; GROWTH; WELLS; GAIN AB Size-controlled spectral tunability and chemical flexibility make semiconductor nanocrystals (NCs) attractive as nanoscale building blocks for color-selectable optical-gain media. The technological potential of NCs as lasing materials is. however, significantly diminished by highly efficient nonradiative Auger recombination of multiexcitons leading to ultrafast decay of optical gain. Here we explore a novel approach to achieve NC lasing in the Auger recombination-free regime by using type II NC heterostructures that promote spatial separation of electrons and holes. We show that such hetero-NCs can exhibit strong repulsive exciton-exciton interactions that lead to significantly reduced excited-state absorption associated with NCs containing sinale electron-hole pairs. This effect leads to reduced optical-gain thresholds and can potentially allow lasing in the single-exciton regime, for which Auger recombination is inactive. We use these novel hetero-Ncs to demonstrate efficient amplified spontaneous emission (ASE) that is tunable across a "difficult" range of green and blue colors. The ASE in the blue range has never been previously achieved using traditional NCs with type I carrier localization. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Klimov, VI (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM klimov@lanl.gov RI Piryatinski, Andrei/B-5543-2009; Ivanov, Sergei/B-5505-2011; Tretiak, Sergei/B-5556-2009; Achermann, Marc/A-1849-2011 OI Tretiak, Sergei/0000-0001-5547-3647; Achermann, Marc/0000-0002-3939-9309 NR 26 TC 135 Z9 137 U1 6 U2 43 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 JUL 29 PY 2004 VL 108 IS 30 BP 10625 EP 10630 DI 10.1021/jp0483371 PG 6 WC Chemistry, Physical SC Chemistry GA 840MY UT WOS:000222864200004 ER PT J AU Zhang, J Mo, Y Vukmirovic, MB Klie, R Sasaki, K Adzic, RR AF Zhang, J Mo, Y Vukmirovic, MB Klie, R Sasaki, K Adzic, RR TI Platinum monolayer electrocatalysts for O-2 reduction: Pt monolayer on Pd(111) and on carbon-supported Pd nanoparticles SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID DENSITY-FUNCTIONAL THEORY; OXYGEN REDUCTION; ALLOY SURFACES; OXIDATION; POLYCRYSTALLINE; SUBMONOLAYERS; ELECTROLYTE; REPLACEMENT; DEPOSITION; ADSORPTION AB The kinetics of oxygen reduction was studied in acid solutions on Pt monolayers deposited on a Pd(111) surface and on carbon-supported Pd nanoparticles using the rotating disk-ring electrode technique. These electrocatalysts were prepared by a new method for depositing Pt monolayers involving the galvanic displacement by Pt of an underpotentially deposited Cu monolayer on a Pd Substrate and characterized by scanning tunneling and transmission electron microscopies. The kinetics of O-2 reduction shows a significant enhancement at Pt monolayers on Pd(111) and Pd nanoparticle surfaces in comparison with the reaction on Pt(111) and Pt nanoparticles. The four-electron reduction, with a first-charge transfer-rate determining step, is operative on both surfaces. The observed increase in the catalytic activity of Pt monolayer surfaces compared with Pt bulk and nanoparticle electrodes may reflect decreased formation of PtOH. An enhanced atomic scale surface roughness and low coordination of some atoms may contribute to the observed activity. The results illustrate that placing a Pt monolayer on a suitable metal nanoparticle substrate is an attractive way of designing better O-2 reduction electrocatalysts. Also, by using this method the Pt content is reduced to very low levels. The Pt mass-specific activity of the Pt/Pd/C electrode is 5-8 times higher than that of the Pt/C electrocatalyst. The noble metal (Pt + Pd) mass-specific activity is two times higher than that of Pt/C. C1 Brookhaven Natl Lab, Dept Mat Sci, Upton, NY 11973 USA. RP Adzic, RR (reprint author), Brookhaven Natl Lab, Dept Mat Sci, Upton, NY 11973 USA. NR 39 TC 460 Z9 467 U1 21 U2 213 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 JUL 29 PY 2004 VL 108 IS 30 BP 10955 EP 10964 DI 10.1021/jp0379953 PG 10 WC Chemistry, Physical SC Chemistry GA 840MY UT WOS:000222864200050 ER PT J AU Utschig, LM Astashkin, AV Raitsimring, AM Thurnauer, MC Poluektov, OG AF Utschig, LM Astashkin, AV Raitsimring, AM Thurnauer, MC Poluektov, OG TI Pulsed EPR/ENDOR characterization of the Cu2+ surface site in photosynthetic bacterial reaction centers SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID ELECTRON-SPIN-ECHO; RHODOBACTER-SPHAEROIDES R-26; QUADRUPOLE RESONANCE-SPECTRA; PROTON-TRANSFER; RHODOPSEUDOMONAS-VIRIDIS; COORDINATED IMIDAZOLE; ENVELOPE MODULATION; HISTIDINE LIGATION; COPPER PROTEINS; 3A RESOLUTION AB X-band pulsed electron paramagnetic resonance was used to elucidate details of the Cu2+ surface binding site involved in Q(A)(-)Q(B) --> Q(A)Q(B)(-) electron transfer in photosynthetic bacterial reaction centers (RCs). Electron spin-echo envelope modulation (ESEEM) spectroscopy was employed to measure the hyperfine and electric quadrupole interactions of weakly coupled N-14 nuclei, and X-band pulsed electron nuclear double resonance (ENDOR) spectroscopy was used to probe strongly coupled N-14 nuclei. The N-14 ESEEM observed for Cu2+ at the surface site of RCs results from a single histidine ligand. In addition, the ENDOR spectra reveal the presence of one more nitrogen ligand in the Cu2+ coordination sphere that we tentatively assign as a peptide backbone nitrogen. The similarity of the ESEEM and ENDOR spectra for RCs from Rb. sphaeroides, Rb. capsulatus, and Blc. viridis suggests a universal intrinsic structural site. These results indicate that Cu2+ has a different coordination environment from the crystallographically characterized Zn2+ and Cd2+ surface sites in Rb. sphaeroides RCs. These structural differences may be associated with observed metal ion specific differences in alteration Of Q(A)(-)Q(B) --> Q(A)Q(B)(-) electron transfer. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Univ Arizona, Dept Chem, Tucson, AZ 85721 USA. RP Utschig, LM (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. EM utschig@anl.gov NR 54 TC 6 Z9 6 U1 0 U2 5 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 JUL 29 PY 2004 VL 108 IS 30 BP 11150 EP 11156 DI 10.1021/jp037730o PG 7 WC Chemistry, Physical SC Chemistry GA 840MY UT WOS:000222864200074 ER PT J AU Homes, CC Dordevic, SV Strongin, M Bonn, DA Liang, RX Hardy, WN Komiya, S Ando, Y Yu, G Kaneko, N Zhao, X Greven, M Basov, DN Timusk, T AF Homes, CC Dordevic, SV Strongin, M Bonn, DA Liang, RX Hardy, WN Komiya, S Ando, Y Yu, G Kaneko, N Zhao, X Greven, M Basov, DN Timusk, T TI A universal scaling relation in high-temperature superconductors SO NATURE LA English DT Article ID OPTICAL-PROPERTIES; PENETRATION DEPTH; C-AXIS; CUPRATE SUPERCONDUCTORS; GAP ANISOTROPY; CONDUCTIVITY; PSEUDOGAP; PLANE; TL2BA2CUO6+DELTA; LA2-XSRXCUO4 AB Since the discovery of superconductivity at elevated temperatures in the copper oxide materials(1) there has been a considerable effort to find universal trends and correlations amongst physical quantities, as a clue to the origin of the superconductivity. One of the earliest patterns that emerged was the linear scaling of the superfluid density (rho(s)) with the superconducting transition temperature (T-c), which marks the onset of phase coherence. This is referred to as the Uemura relation(2), and it works reasonably well for the underdoped materials. It does not, however, describe optimally doped ( where T-c is a maximum) or overdoped materials(3). Similarly, an attempt to scale the superfluid density with the d.c. conductivity (sigma(dc)) was only partially successful(4). Here we report a simple scaling relation (rho(s) proportional to proportional to(dc)T(c), with sigma(dc) measured at approximately T-c) that holds for all tested high-T-c materials. It holds regardless of doping level, nature of dopant ( electrons versus holes), crystal structure and type of disorder(5), and direction ( parallel or perpendicular to the copper oxygen planes). C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 2A6, Canada. Cent Res Inst Elect Power Ind, Tokyo 2018511, Japan. Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada. RP Homes, CC (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM homes@bnl.gov RI Ando, Yoichi/B-8163-2013; Yu, Guichuan/K-4025-2014 OI Ando, Yoichi/0000-0002-3553-3355; NR 29 TC 127 Z9 131 U1 3 U2 26 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD JUL 29 PY 2004 VL 430 IS 6999 BP 539 EP 541 DI 10.1038/nature02673 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 841QI UT WOS:000222946100041 PM 15282599 ER PT J AU Lin, JF Sturhahn, W Zhao, JY Shen, GY Mao, HK Hemley, RJ AF Lin, JF Sturhahn, W Zhao, JY Shen, GY Mao, HK Hemley, RJ TI Absolute temperature measurement in a laser-heated diamond anvil cell SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID DENSITY-OF-STATES; NUCLEAR RESONANT SCATTERING; HIGH-PRESSURE; IRON; SYSTEM AB The laser-heated diamond anvil cell has been widely used to study mineral physics under high pressure and temperature, and these studies have provided valuable information in understanding planetary interiors; however, use of the spectroradiometric method in the studies has raised concerns about the accuracy of obtained temperature values. We have built a laser-heating system coupled with nuclear resonant inelastic x-ray scattering to explore particular physical properties of deep-Earth materials. Energy spectra of iron were measured up to 58 GPa and 1700 K. The detailed balance principle applied to the inelastic x-ray scattering spectra provides absolute temperatures of the laser-heated sample. These temperatures are in very good agreement with values determined from the thermal radiation spectra fitted to the Planck radiation function up to 1700 K. Our data provide, for the first time, independent confirmation of the validity of temperatures determined from spectroradiometric method in the laser-heated diamond cell experiments. C1 Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA. RP Lin, JF (reprint author), Carnegie Inst Washington, Geophys Lab, 5251 Broad Branch Rd NW, Washington, DC 20015 USA. EM j.lin@gl.ciw.edu RI Lin, Jung-Fu/B-4917-2011; Shen, Guoyin/D-6527-2011 NR 24 TC 22 Z9 23 U1 1 U2 7 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 28 PY 2004 VL 31 IS 14 AR L14611 DI 10.1029/2004GL020599 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 844TS UT WOS:000223183900006 ER PT J AU Ozolins, V Majzoub, EH Udovic, TJ AF Ozolins, V Majzoub, EH Udovic, TJ TI Electronic structure and Rietveld refinement parameters of Ti-doped sodium alanates SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE hydrogen storage materials; hydrogen absorbing materials; metal hydrides; crystal structure; electronic structure; neutron diffraction; mechanical alloying; X-ray diffraction; neutron diffraction; structural modeling; Rietveld refinement; electronic band structures; crystal bonding ID TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; HYDROGEN STORAGE; PSEUDOPOTENTIALS; DIFFRACTION; TITANIUM; METALS AB The structure of Ti-doped sodium aluminum deuteride has been determined using Rietveld refinement of X-ray and neutron powder diffraction data and compared to values for undoped NaAlD4 and NaAlH4. The refined lattice parameters for the tetragonal NaAlD4 structure are found to be a 5.010 Angstrom and c = 11.323 Angstrom, while those of the monoclinic Na3AlD6 structure are a = 5.402 Angstrom, b = 5.507 Angstrom, c = 7.725 Angstrom, and beta = 89.491degrees. Results of ab initio calculations of the lattice parameters are within a few percent of the Rietveld-refined values. The generalized gradient approximation (GGA) is found to produce significantly better agreement with the experimental data than the local-density approximation (LDA), which is attributed to a very inhomogeneous distribution of electronic density in the alanates. The Rietveld refinement, LDA, and GGA results for the Al-H bond length in NaAlD4 are 1.626, 1.634, and 1.631 Angstrom, respectively. Refined values of the Al-H bond lengths in Na3AlD6, are in agreement within 2% of earlier work on undoped Na3AlD6 [J. Alloy Comp. 299 (1-2) (2000) 10 1]. The calculated GGA formation energies for the decomposition reactions of NaAlD4 and Na3AlD6 are 33.5 and 49.9 kJ/mol of H-2, respectively. The corresponding LDA values are significantly higher: 44.6 and 70.3 kJ/mol of H-2. Comparison with the experimental enthalpy data suggests that the GGA results are in a very good agreement with the measured DeltaH [Proceedings of the 1999 DOE Hydrogen Program Annual Peer Review, NREL/CP-570-26938; J. Alloy Comp. 302 (1-2) (2000) 36]. Detailed theoretical analyses of the electronic band structure, valence charge density distribution, and lattice bonding properties are given. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA. Sandia Natl Labs, Livermore, CA 94551 USA. Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA. RP Ozolins, V (reprint author), Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA. EM vidvuds@seas.ucla.edu; ehmajzo@sandia.gov; udovic@nist.gov RI Ozolins, Vidvuds/D-4578-2009 NR 31 TC 69 Z9 70 U1 1 U2 17 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 JUL 28 PY 2004 VL 375 IS 1-2 BP 1 EP 10 DI 10.1016/j.jallcom.2003.11.154 PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA 836GM UT WOS:000222543800002 ER PT J AU Andreev, AV Honda, F Sechovsky, V El-Khatib, S Alsmadi, AM Nakotte, H Lacerda, AH AF Andreev, AV Honda, F Sechovsky, V El-Khatib, S Alsmadi, AM Nakotte, H Lacerda, AH TI Electronic properties of UCoAl0.75Sn0.25 single crystal SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE uranium intermetallics; UTX compounds; ferromagnetism; magnetic anisotropy; magnetoresistivity; specific heat ID UCOAL1-XSNX AB A single crystal of the UCoAl0.75Sn0.25 quasiternary compound has been grown and studied by measuring the magnetization, specific heat and electrical resistivity at various temperatures and magnetic fields. Similar to the parent compounds UCoAl and UCoSn, the magnetization of their solid solution exhibits uniaxial anisotropy with a strong magnetic response along the c-axis and a weak and nearly temperature independent paramagnetic signal in the basal plane. The evolution of the c-axis magnetization isotherms, as well as the anomalies in the temperature dependence of the specific heat and resistivity point to ferromagnetism in UCoAl0.75Sn0.25 below T-C approximate to 5.5 K. The low value of the spontaneous magnetic moment, poor saturation of the magnetization, the pronounced negative magnetoresistance with increasing magnetic field and the temperature and magnetic field dependence of specific heat provide indications of strong fluctuations of the U magnetic moment also in the ferromagnetic state. (C) 2003 Elsevier B.V. All rights reserved. C1 ASCR, Inst Phys, Prague 18221 8, Czech Republic. Charles Univ, Dept Elect Struct, Prague 12116 2, Czech Republic. New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA. Los Alamos Natl Lab, NHMFL, Los Alamos, NM 87545 USA. RP Andreev, AV (reprint author), ASCR, Inst Phys, Na Slovance 2, Prague 18221 8, Czech Republic. EM andreev@apollo.karlov.mff.cuni.cz RI Andreev, Alexander/B-6057-2011; HONDA, Fuminori/D-5578-2015; Sechovsky, Vladimir/A-5256-2008 OI HONDA, Fuminori/0000-0002-9485-7384; Sechovsky, Vladimir/0000-0003-1298-2120 NR 6 TC 0 Z9 0 U1 0 U2 5 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 JUL 28 PY 2004 VL 375 IS 1-2 BP 67 EP 71 DI 10.1016/j.jallcom.2003.11.130 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA 836GM UT WOS:000222543800013 ER PT J AU Lobanov, MV Greenblatt, M Caspi, EN Jorgensen, JD Sheptyakov, DV Toby, BH Botez, CE Stephens, PW AF Lobanov, MV Greenblatt, M Caspi, EN Jorgensen, JD Sheptyakov, DV Toby, BH Botez, CE Stephens, PW TI Crystal and magnetic structure of the Ca3Mn2O7 Ruddlesden-Popper phase: neutron and synchrotron x-ray diffraction study SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID LA2-2XCA1+2XMN2O7; MAGNETORESISTANCE; SPIN AB The crystallographic and magnetic structures of Ca3Mn2O7 Ruddlesden-Popper phase have been determined by a combination of neutron and synchrotron x-ray diffraction. Two-phase behaviour observed at room temperature is attributed to an incomplete structural phase transition. The magnetic structure was solved in the Cm'c2'(1) Shubnikov group with dominant G-type antiferromagnetic order in the perovskite bilayers. The temperature evolution of the structural and magnetic parameters is presented. C1 Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Nucl Res Ctr Negev, Dept Phys, IL-84190 Beer Sheva, Israel. ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA. SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Greenblatt, M (reprint author), Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA. RI Lobanov, Maxim/C-2963-2012; Toby, Brian/F-3176-2013; Sheptyakov, Denis/F-5333-2016 OI Toby, Brian/0000-0001-8793-8285; Sheptyakov, Denis/0000-0002-3001-6586 NR 25 TC 23 Z9 23 U1 3 U2 56 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUL 28 PY 2004 VL 16 IS 29 SI SI BP 5339 EP 5348 AR PII S0953-8984(04)75232-7 DI 10.1088/0953-8984/16/29/023 PG 10 WC Physics, Condensed Matter SC Physics GA 847JT UT WOS:000223389200029 ER PT J AU Mo, H Trogisch, S Taub, H Ehrlich, SN Volkmann, UG Hansen, FY Pino, M AF Mo, H Trogisch, S Taub, H Ehrlich, SN Volkmann, UG Hansen, FY Pino, M TI Studies of the structure and growth mode of dotriacontane films by synchrotron x-ray scattering and molecular dynamics simulations SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article; Proceedings Paper CT Workshop on Surface Dynamics, Phonons, Adsorbate Vibrations and Diffusion CY OCT 02-05, 2003 CL Meramec, MO ID ALKANE FILMS; SIO2 SURFACE AB We report on synchrotron x-ray scattering experiments and molecular dynamics simulations of the structure and growth mode of dotriacontane (n-C32H66 or C32) films adsorbed on Ag(111) and SiO2-coated Si(100) substrates. On the SiO2 surface, the x-ray measurements confirm a structural model of the solid film inferred from high-resolution ellipsometry measurements in which one or two layers of C32 adsorb with the long axis of the molecule oriented parallel to the interface followed by a monolayer in which the molecules have a perpendicular orientation. At higher C32 coverages, preferentially oriented bulk particles nucleate, consistent with a Stranski-Krastanov growth mode. On the Ag(111) surface, we again observe one or two layers of the 'parallel' film but no evidence of the perpendicular monolayer before nucleation of the preferentially oriented bulk particles. We compare the experimentally observed structures with molecular dynamics simulations of a multilayer film of the homologous C24 molecule. C1 Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA. Univ Missouri, Res Reactor, Columbia, MO 65211 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. Pontificia Univ Catolica Chile, Fac Fis, Santiago 22, Chile. Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark. RP Mo, H (reprint author), Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA. RI Volkmann, Ulrich/H-1802-2014 NR 8 TC 9 Z9 9 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUL 28 PY 2004 VL 16 IS 29 SI SI BP S2905 EP S2910 AR PII S0953-8984(04)80323-0 DI 10.1088/0953-8984/16/29/005 PG 6 WC Physics, Condensed Matter SC Physics GA 847JT UT WOS:000223389200007 ER PT J AU Cai, TH Song, Z Rodriguez, JA Hrbek, J AF Cai, TH Song, Z Rodriguez, JA Hrbek, J TI Preparation and structural characterization of RuS2 nanoislands on Au(III) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID TRANSITION-METAL SULFIDES; AB-INITIO; DENSITY; HYDRODESULFURIZATION; NANOCLUSTERS; ADSORPTION; CHEMISTRY; CATALYSIS; THIOPHENE; SURFACES C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Hrbek, J (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. EM hrbek@bnl.gov RI Hrbek, Jan/I-1020-2013 NR 21 TC 19 Z9 19 U1 1 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 JUL 28 PY 2004 VL 126 IS 29 BP 8886 EP 8887 DI 10.1021/ja047634g PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 840JT UT WOS:000222855300013 PM 15264806 ER PT J AU Harrison, BS Foley, TJ Knefely, AS Mwaura, JK Cunningham, GB Kang, TS Bouguettaya, M Boncella, JM Reynolds, JR Schanze, KS AF Harrison, BS Foley, TJ Knefely, AS Mwaura, JK Cunningham, GB Kang, TS Bouguettaya, M Boncella, JM Reynolds, JR Schanze, KS TI Near-infrared photo- and electroluminescence of alkoxy-substituted poly(p-phenylene) and nonconjugated polymer/lanthanide tetraphenylporphyrin blends SO CHEMISTRY OF MATERIALS LA English DT Article ID LIGHT-EMITTING-DIODES; CONJUGATED POLYMER BLENDS; ENERGY-TRANSFER; MU-M; SEMICONDUCTING POLYMERS; EFFICIENT; COMPLEXES; EMISSION; DEVICES; LUMINESCENCE AB The photoluminescent and electroluminescent properties of near-infrared (near-IR) emitting lanthanide monoporphyrinate complexes, Ln(TPP)L (L = hydridotris(l-pyrazolyl)borate (Tp) or (cyclopentadienyl)tris(diethylphosphinito)cobaltate(I) L(OEt)) blended into conjugated and nonconjugated polymer hosts were characterized. A blue-emitting alkoxy-substituted poly(p-phenylene) (PPP-OR11) was used as the conjugated polymer host and nonconjugated hosts included polystyrene, poly(methyl methacrylate), poly(n-butyl methacrylate), and poly(bisphenol A-carbonate). Complete quenching of the PPP-OR11 host fluorescence (i.e., > 95%) is observed at 5 mol % of Ln(TPP)Tp, and host quenching is accompanied by sensitization of near-IR emission from the lanthanide complex. The photoluminescence results suggest that energy transfer occurs from PPP-OR11 to Ln(TPP)L, presumably via the Forster mechanism. Near-IR light emitting diodes (PLEDs) consisting of Yb(TPP)Tp blended into PPP-OR11 and the nonconjugated polymer hosts were characterized. PLEDs fabricated with PPP-OR11 exhibited turn-on voltages of approximately 4 V, whereas nonconjugated polymer devices had higher turn-on voltages (ca. 8 V), independent of the polymer used. Comparable external electroluminescence (EL) efficiencies on the order of 10(-4) were observed from both the conjugated and nonconjugated polymer host devices. Taken together, the available evidence suggests that the dominant mechanism operating in the EL devices involves the Ln(TPP)L complex as the charge-transport material, the center for electron-hole recombination, and the emitter. C1 Univ Florida, Dept Chem, Gainesville, FL 32611 USA. Univ Florida, Ctr Macromol Sci & Engn, Gainesville, FL 32611 USA. RP Boncella, JM (reprint author), Los Alamos Natl Lab, POB 1663,Mail Stop J-582, Los Alamos, NM 87545 USA. EM boncella@lanl.gov; reynolds@chem.ufl.edu; kschanze@chem.ufl.edu RI Schanze, Kirk/A-7200-2009; OI Schanze, Kirk/0000-0003-3342-4080; Boncella, James/0000-0001-8393-392X NR 53 TC 65 Z9 66 U1 1 U2 12 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 JUL 27 PY 2004 VL 16 IS 15 BP 2938 EP 2947 DI 10.1021/cm049937f PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 840VL UT WOS:000222887900015 ER PT J AU Ji, SH Nicholl, MJ Glass, RJ Lee, KK AF Ji, SH Nicholl, MJ Glass, RJ Lee, KK TI Influence of a simple fracture intersection on density-driven immiscible flow: Wetting vs. nonwetting flows SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID UNSATURATED FLOW; DYNAMICS; LIQUID AB The influence of a single fracture intersection on density-driven immiscible flow is compared between wetting ( water into air) and nonwetting ( Trichloroethylene into water) flows. At low supply rates, the intersection acted as a hysteretic gate to pulsed flow of the wetting phase, but had minimal influence on nonwetting phase flow. For both cases, increasing the supply rate led to the formation of continuous fluid tendrils that crossed the intersection without interruption. The wetting experiment returned to pulsed flow as the supply rate was decreased, while the nonwetting experiment maintained a continuous flow structure. Results suggest a fundamental difference between wetting and nonwetting phase flows in fracture networks. C1 Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 151747, South Korea. Sandia Natl Labs, Flow Visualizat & Proc Lab, Albuquerque, NM 87185 USA. Univ Nevada, Dept Geosci, Las Vegas, NV 89122 USA. RP Ji, SH (reprint author), Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 151747, South Korea. EM ji0511@snu.ac.kr; michael.nicholl@ccmail.nevada.edu; rjglass@sandia.gov; kklee@snu.ac.kr NR 8 TC 3 Z9 3 U1 2 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 27 PY 2004 VL 31 IS 14 AR L14501 DI 10.1029/2004GL020045 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 844TQ UT WOS:000223183700002 ER PT J AU Garay, JE Glade, SC Anselmi-Tamburini, U Asoka-Kumar, P Munir, ZA AF Garay, JE Glade, SC Anselmi-Tamburini, U Asoka-Kumar, P Munir, ZA TI Electric current enhanced defect mobility in Ni3Ti intermetallics SO APPLIED PHYSICS LETTERS LA English DT Article ID POSITRON-ANNIHILATION; LATTICE VACANCIES; ELECTROMIGRATION; DIFFUSION; METALS; RESISTIVITY; MULTILAYERS; ALUMINUM; GOLD AB The effect of the application of a dc current on the annealing of point defects in Ni3Ti was investigated by positron annihilation spectroscopy. An increased defect annealing rate was observed under the influence of the current and was attributed to a 24% decrease in the activation energy of mobility. The results are interpreted in terms of the electron wind effect and the complex nature of diffusion in ordered intermetallic phases. They provide direct evidence for an increase in defect mobility in ordered intermetallics under the influence of a current. (C) 2004 American Institute of Physics. C1 Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Munir, ZA (reprint author), Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA. EM zamunir@ucdavis.edu NR 24 TC 209 Z9 212 U1 0 U2 23 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 2004 VL 85 IS 4 BP 573 EP 575 DI 10.1063/1.1774268 PG 3 WC Physics, Applied SC Physics GA 840JU UT WOS:000222855400021 ER PT J AU Han, SH Hermann, AM Hasoon, FS Al-Thani, HA Levi, DH AF Han, SH Hermann, AM Hasoon, FS Al-Thani, HA Levi, DH TI Effect of Cu deficiency on the optical properties and electronic structure of CuInSe2 and CuIn0.8Ga0.2Se2 determined by spectroscopic ellipsometry SO APPLIED PHYSICS LETTERS LA English DT Article ID ABC2 CHALCOPYRITE SEMICONDUCTORS; SURFACE; CUGASE2; DIFFERENTIATION AB Spectroscopic ellipsometry measurements of CuInSe2 (CIS) and CuIn0.8Ga0.2Se2 (CIGS) reveal that there are important differences in electronic properties between stoichiometric CIS (CIGS) and Cu-poor CIS (CIGS). We find a reduction in the absorption strength in the spectral region of 1-3 eV. This reduction can be explained in terms of the Cu 3d density of states. Cu-poor CIS (CIGS) materials show an increase in band gap due to the reduction in repulsion between Cu 3d and Se 4p states. The experimental results have important implications for the function of polycrystalline optoelectronic devices. (C) 2004 American Institute of Physics. C1 Univ Colorado, Dept Phys, Boulder, CO 80303 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Han, SH (reprint author), Univ Colorado, Dept Phys, Boulder, CO 80303 USA. EM sung-ho.han@colorado.edu RI Han, Sung-Ho/B-7678-2008 NR 25 TC 33 Z9 33 U1 1 U2 24 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 JUL 26 PY 2004 VL 85 IS 4 BP 576 EP 578 DI 10.1063/1.1776616 PG 3 WC Physics, Applied SC Physics GA 840JU UT WOS:000222855400022 ER PT J AU Emergo, RLS Wu, JZ Aytug, T Christen, DK AF Emergo, RLS Wu, JZ Aytug, T Christen, DK TI Thickness dependence of superconducting critical current density in vicinal YBa2Cu3O7-delta thick films SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSPORT-PROPERTIES; CONDUCTORS; DEPOSITION; SRTIO3(001) AB In YBa2Cu3O7-delta (YBCO) thick films, the superconducting critical current density (J(c)) decreases with increasing film thickness (t). The mechanisms responsible for this J(c)-t behavior remain unclear. To probe the correlation between the film microstructure and J(c)-thickness behavior, we have deposited YBCO thick films up to 3.0 mum in thickness on flat and surface-miscut (100) SrTiO3 substrates with 5degrees, 10degrees, and 15degrees vicinal angles. The microstructures of the YBCO films were found to evolve differently on flat and miscut substrates, resulting in different J(c)-t behaviors. Surprisingly the small miscut angles of 5degrees-10degrees were favorable to obtain higher J(c) and smaller J(c) reduction at larger film thickness. (C) 2004 American Institute of Physics. C1 Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Wu, JZ (reprint author), Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA. EM jwu@ku.edu NR 21 TC 39 Z9 39 U1 0 U2 9 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 2004 VL 85 IS 4 BP 618 EP 620 DI 10.1063/1.1775882 PG 3 WC Physics, Applied SC Physics GA 840JU UT WOS:000222855400036 ER PT J AU Baik, HS Kim, M Park, GS Song, SA Varela, M Franceschetti, A Pantelides, ST Pennycook, SJ AF Baik, HS Kim, M Park, GS Song, SA Varela, M Franceschetti, A Pantelides, ST Pennycook, SJ TI Interface structure and non-stoichiometry in HfO2 dielectrics SO APPLIED PHYSICS LETTERS LA English DT Article ID ATOMIC-LAYER DEPOSITION; CHEMICAL-VAPOR-DEPOSITION; GATE DIELECTRICS; THIN-FILMS; ELECTRICAL-PROPERTIES; ELECTRONIC-STRUCTURE; THERMAL-STABILITY; SUBSTRATE; SI(100); SCALE AB High-resolution electron microscopy, electron energy-loss spectroscopy, and first-principles theory are used to investigate the composition and electronic structure of HfO2 dielectric layers deposited directly onto Si. A thin, nonstoichiometric, but Hf-free SiO2 layer forms between the HfO2 dielectric and the substrate, consistent with one-dimensional spinodal decomposition. Rapid thermal annealing crystallizes the HfO2, and the resulting grain boundaries within the HfO2 are found to be O-depleted, with localized states within the bandgap. These localized states are thought to act as significant leakage pathways, and may be responsible for Fermi-level pinning at the dielectric/contact interface. (C) 2004 American Institute of Physics. C1 Samsung Adv Inst Technol, Analyt Engn Ctr, Suwon 440600, South Korea. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. Vanderbilt Univ, Dept Phys, Nashville, TN 37064 USA. RP Baik, HS (reprint author), Samsung Adv Inst Technol, Analyt Engn Ctr, POB 111, Suwon 440600, South Korea. EM pennycooksj@ornl.gov RI Varela, Maria/H-2648-2012; Varela, Maria/E-2472-2014; Kim, Miyoung/C-8316-2012 OI Varela, Maria/0000-0002-6582-7004; NR 24 TC 55 Z9 55 U1 3 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 JUL 26 PY 2004 VL 85 IS 4 BP 672 EP 674 DI 10.1063/1.1772855 PG 3 WC Physics, Applied SC Physics GA 840JU UT WOS:000222855400054 ER PT J AU Daines, DA Jarisch, J Smith, AL AF Daines, DA Jarisch, J Smith, AL TI Identification and characterization of a nontypeable Haemophilus influenzae putative toxin-antitoxin locus SO BMC MICROBIOLOGY LA English DT Article ID EPITHELIAL-CELLS; ESCHERICHIA-COLI; VIRULENCE; SYSTEM; INFECTION; PROTEINS; PLASMID; BINDING; LAYERS; MEDIA AB Background: Certain strains of an obligate parasite of the human upper respiratory tract, nontypeable Haemophilus influenzae (NT(Hi)), can cause invasive diseases such as septicemia and meningitis, as well as chronic mucosal infections such as otitis media. To do this, the organism must invade and survive within both epithelial and endothelial cells. We have identified a facilitator of NT(Hi) survival inside human cells, virulence-associated protein D (vapD(Hi), encoded by gene H10450). Both vapD(Hi) and a flanking gene, H10451, exhibit the genetic and physical characteristics of a toxin/antitoxin ( TA) locus, with VapD(Hi) serving as the toxin moiety and H10451 as the antitoxin. We propose the name VapX(Hi) for the H10451 antitoxin protein. Originally identified on plasmids, TA loci have been found on the chromosomes of a number of bacterial pathogens, and have been implicated in the control of translation during stressful conditions. Translation arrest would enhance survival within human cells and facilitate persistent or chronic mucosal infections. Results: Isogenic mutants in vapD(Hi) were attenuated for survival inside human respiratory epithelial cells (NCI-H292) and human brain microvascular endothelial cells (HBMEC), the in vitro models of mucosal infection and the blood-brain barrier, respectively. Transcomplementation with a vapD(Hi) allele restored wild-type NT(Hi) survival within both cell lines. A PCR survey of 59 H. influenzae strains isolated from various anatomical sites determined the presence of a vapD(Hi)allele in 100% of strains. Two isoforms of the gene were identified in this population; one that was 91 residues in length, and another that was truncated to 45 amino acids due to an in-frame deletion. The truncated allele failed to transcomplement the NT(Hi) vapD(Hi) survival defect in HBMEC. Subunits of full-length VapD(Hi) homodimerized, but subunits of the truncated protein did not. However, truncated protein subunits did interact with full-length subunits, and this interaction resulted in a dominant-negative phenotype. Although Escherichia coli does not contain a homologue of either vapD(Hi) or vapX(Hi), overexpression of the VapD(Hi) toxin in trans resulted in E. coli cell growth arrest. This arrest could be rescued by providing the VapX(Hi) antitoxin on a compatible plasmid. Conclusion: We conclude that vapDHi and vapX(Hi) may constitute a H. influenzae TA locus that functions to enhance NT(Hi) survival within human epithelial and endothelial cells. C1 Lawrence Livermore Natl Lab, Nonproliferat Arms Control & Int Secur Directorat, Livermore, CA 94550 USA. Seattle Biomed Res Inst, Bacterial Pathogenesis Program, Seattle, WA 98109 USA. RP Daines, DA (reprint author), Lawrence Livermore Natl Lab, Nonproliferat Arms Control & Int Secur Directorat, L-501,7000 E Ave, Livermore, CA 94550 USA. EM daines2@llnl.gov; Justin.Jarisch@sbri.org; Arnold.Smith@sbri.org FU NIAID NIH HHS [T32 AI007276, AI 07276, AI 44002, R01 AI044002] NR 28 TC 13 Z9 14 U1 2 U2 4 PU BIOMED CENTRAL LTD PI LONDON PA 236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND SN 1471-2180 J9 BMC MICROBIOL JI BMC Microbiol. PD JUL 26 PY 2004 VL 4 AR 30 DI 10.1186/1471-2180-4-30 PG 11 WC Microbiology SC Microbiology GA 844UD UT WOS:000223185200001 PM 15274747 ER PT J AU Xu, JD Gorden, AEV Raymond, KN AF Xu, JD Gorden, AEV Raymond, KN TI Octadentate ligands containing 2,3-dihydroxybenzamide and 2,3-dihydroxyterephthalamide coordinating subunits on a tetrapodal amine backbone for chelation of actinides SO EUROPEAN JOURNAL OF ORGANIC CHEMISTRY LA English DT Article DE actinide; ligand design; macrocylic ligands; siderophore; synthetic methods ID MICROBIAL IRON TRANSPORT; ION SEQUESTERING AGENTS; IN-VIVO CHELATION; HYDROXYPYRIDINONATE LIGANDS; INITIAL EVALUATION; FERRIC ION; COMPLEXES; PU(IV); MICE; 3,4,3-LICAM(C) AB The linear octadentate ligand 3,4,3-LICAM(C) (2) is one of the most effective chelating agents for Pu-IV that is not acutely toxic; however, at physiological pH, due to the weak acidity of the catechol hydroxy groups and the large proton dependence of the complexation reaction, only three of the four catecholate subunits are coordinated to Pu-IV. To overcome this disadvantage, a new topological class of octadentate ligands based on tetrapodal amine backbones and 2,3-dihydroxyterephthalamide (3) (TAM) binding units were designed and synthesized. The amide substituents provide a handle by which the functionality of the ligand can be readily modified, and this synthetic strategy and procedure can be extended to prepare a variety of new multidentate metal-coordination and extraction agents. A streamlined synthesis for the terephthalamides, both symmetric and asymmetric, was recently reported. In this work, the synthetic details of their incorporation into octadentate systems for use as coordination or extraction agents for Pu-IV or other metals in the +4 oxidation state are described. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Xu, JD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Berkeley, CA 94720 USA. EM Raymond@socrates.berkeley.edu RI Gorden, Anne/D-2477-2011 OI Gorden, Anne/0000-0001-6623-9880 NR 37 TC 8 Z9 8 U1 3 U2 13 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 1434-193X J9 EUR J ORG CHEM JI Eur. J. Org. Chem. PD JUL 26 PY 2004 IS 15 BP 3244 EP 3253 DI 10.1002/ejoc.200400080 PG 10 WC Chemistry, Organic SC Chemistry GA 842XD UT WOS:000223037000009 ER PT J AU Rudd, DJ Sazinsky, MH Merkx, M Lippard, SJ Hedman, B Hodgson, KO AF Rudd, DJ Sazinsky, MH Merkx, M Lippard, SJ Hedman, B Hodgson, KO TI Determination by X-ray absorption spectroscopy of the Fe-Fe separation in the oxidized form of the hydroxylase of methane monooxygenase alone and in the presence of MMOD SO INORGANIC CHEMISTRY LA English DT Article ID METHYLOCOCCUS-CAPSULATUS BATH; METHYLOSINUS-TRICHOSPORIUM OB3B; BRIDGED DIIRON(III) COMPLEXES; CRYSTAL-STRUCTURE; COMPONENT INTERACTIONS; FINE-STRUCTURE; ACTIVE-SITE; IRON CENTER; SUBSTRATE; OXIDATION AB The diiron active site in the hydroxylase of Methylococcus capsulatus (Bath) methane monooxygenase (MMOH) has been studied in the oxidized form by X-ray absorption spectroscopy (XAS). Previous investigations by XAS and X-ray crystallography have identified two different distances (3.0 and 3.4 Angstrom) between the two Fe atoms in the dinuclear site. The present study has employed a systematic extended X-ray absorption fine structure (EXAFS) fitting methodology, utilizing known and simulated active site and relevant model structures, to determine unambiguously the Fe-Fe separation in the oxidized form of MMOH. Consistent and unique fits were only possible for an Fe-Fe distance of 3.0 Angstrom. This methodology was then applied to study potential changes in the active site local structure in the presence of MMOD, a protein of unknown function in multicomponent MMO. Fe K-edge and EXAFS analyses revealed negligible changes in the diiron site electronic and geometric structure upon addition of MMOD to oxidized MMOR. C1 Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Stanford Univ, Dept Chem, Stanford, CA 94309 USA. MIT, Cambridge, MA 02139 USA. RP Hedman, B (reprint author), Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. EM hedman@ssrl.slac.stanford.edu; hodgson@ssrl.slac.stanford.edu RI Merkx, Maarten/E-7009-2011 FU NCRR NIH HHS [RR-01209]; NIGMS NIH HHS [GM32134] NR 34 TC 11 Z9 11 U1 1 U2 7 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 JUL 26 PY 2004 VL 43 IS 15 BP 4579 EP 4589 DI 10.1021/ic049716b PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 840GW UT WOS:000222846300015 PM 15257585 ER PT J AU Gout, D Benbow, E Gourdon, O Miller, GJ AF Gout, D Benbow, E Gourdon, O Miller, GJ TI Composition-structure relationships in polar intermetallics: Experimental and theoretical studies of LaNi1+xAl6-x (x=0.44) SO INORGANIC CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE AB A new ternary aluminide, LaNi1+xAl6-x (X = 0.44), has been synthesized from La, Ni, and Al in sealed silica tubes. Its structure, determined by single-crystal X-ray diffraction, is tetragonal P4/mmm (No. 123) with Z = 1 and has the lattice parameters a = 4.200(8) and c = 8.080(8) Angstrom. Refinement based on F-o(2) yielded R-1 = 0.0197 and wR(2) = 0.020 [l > 2 sigma(l)]. The compound adopts a structure type previously observed in SrAu2Ga5 and EuAu2Ga5. The atomic arrangement is closely related to the one in BaAl4 as well as in other rare-earth gallide compounds such as LaNi0.6Ga6, HoCoGa5, Ce4Ni2Ga20, Ce4Ni2Ga17, Ce4NiGa18, and Ce3Ni2Ga15. This structure exhibits a large open cavity which may be filled by a guest atom. Band structure calculations using density functional theory have been carried out to understand the stability of this new compound. C1 Iowa State Univ, US Dept Energy, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, US Dept Energy, Ames Lab, Ames, IA 50011 USA. RP Miller, GJ (reprint author), Iowa State Univ, US Dept Energy, Dept Chem, Ames, IA 50011 USA. EM gmiller@iastate.edu NR 18 TC 12 Z9 12 U1 0 U2 2 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 JUL 26 PY 2004 VL 43 IS 15 BP 4604 EP 4609 DI 10.1021/ic0497331 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 840GW UT WOS:000222846300018 PM 15257588 ER PT J AU MeLin, SG AF MeLin, SG TI Background radioactivity in sediments near Los Alamos, New Mexico SO SCIENCE OF THE TOTAL ENVIRONMENT LA English DT Article DE background radioactivity; statistical distribution; sediment; fallout; anthropogentic radionuclides ID DETECTION LIMITS; RADIONUCLIDES; SOUTHERN AB River and reservoir sediments have been collected annually by Los Alamos National Laboratory since 1974 and 1979, respectively. These background samples are collected from five river stations and four reservoirs located throughout northern New Mexico and southern Colorado. Analyses include (3)H, (90)Sr, (137)CS, total U, (238)Pu, (239,240)Pu, (241)Am, gross alpha, gross beta, and gross gamma radioactivity. Surprisingly, there are no federal or state regulatory standards in the USA that specify how to compute background radioactivity values on sediments. Hence, the sample median (or 0.50 quantile) is proposed for this background because it reflects central data tendency and is distribution-free. Estimates for the upper limit of background radioactivity on river and reservoir sediments are made for sampled analytes using the 0.95 quantile (two-tail). These analyses also show that seven of ten analytes from reservoir sediments are normally distributed, or are normally distributed after a logarithmic or square root transformation. However, only three of ten analytes from river sediments are similarly distributed. In addition, isotope ratios for (137)Cs/(238)pu. (137)Cs/(239,240)Pu, and (239,240)Pu/(238)Pu from reservoir sediments are independent of clay content, total organic carbon/specific surface area (TOC/SSA) and cation exchange capacity/specific surface area (CEC/SSA) ratios. These TOC/SSA and CEC/SSA ratios reflect sediment organic carbon and surface charge densities that are associated with radionuclide absorption, adsorption, and ion exchange reactions on clay mineral structures. These latter ratio values greatly exceed the availability of background radionuclides in the environment, and insure that measured background levels are a maximum. Since finer-grained reservoir sediments contain larger clay-sized fractions compared to coarser river sediments, they show higher background levels for most analytes. Furthermore, radioactivity values on reservoir sediments have remained relatively constant since the early 1980s. These results suggest that clay contents in terrestrial sediments are often more important at concentrating background radionuclides than many other environmental factors, including geology, climate and vegetation. Hence, reservoirs and floodplains represent ideal radionuclide sampling locations because fine-grained materials are more easily trapped here. Ultimately, most of these differences still reflect spatial and temporal variability originating from global atmospheric nuclear weapons testing and disintegration of nuclear-powered satellites upon atmospheric reentry. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Water Qual & Hydrol Grp, Los Alamos, NM 87545 USA. RP MeLin, SG (reprint author), Los Alamos Natl Lab, Water Qual & Hydrol Grp, POB 1663, Los Alamos, NM 87545 USA. EM sgm@lanl.gov NR 42 TC 0 Z9 0 U1 1 U2 2 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 JUL 26 PY 2004 VL 328 IS 1-3 BP 143 EP 159 DI 10.1016/j.scitotenv.2004.01.025 PG 17 WC Environmental Sciences SC Environmental Sciences & Ecology GA 841VC UT WOS:000222958700013 ER PT J AU De la Rosa, MP Texier, S Berhault, G Camacho, A Yacaman, MJ Mehta, A Fuentes, S Montoya, JA Murrieta, F Chianelli, RR AF De la Rosa, MP Texier, S Berhault, G Camacho, A Yacaman, MJ Mehta, A Fuentes, S Montoya, JA Murrieta, F Chianelli, RR TI Structural studies of catalytically stabilized model and industrial-supported hydrodesulfurization catalysts SO JOURNAL OF CATALYSIS LA English DT Article DE molybdenum sulfide; hydrodesulfurization; CoMo; stacking; morphology; X-ray scattering ID RESOLUTION ELECTRON-MICROSCOPY; MOLYBDENUM SULFIDE CATALYSTS; HYDROTREATING CATALYSTS; PROMOTED MOS2; PHASE; HYDRODENITROGENATION; DEACTIVATION; MECHANISM; CARBON; CYCLE AB The high anisotropic character and inherent disorder in the structure Of Supported MoS2-based catalysts that are used extensively to perform hydrotreating reactions for the removal of heteroatoms (S, N, and 0), aromatics, and metals make characterization of the active catalyst a difficult challenge. XAS (X-ray absorption spectroscopy), XRD (X-ray diffraction), and HRTEM (high-resolution transmission electron microscopy) have been widely used in an attempt to understand the structure and origin of the active phase in these catalysts. However, phase and the associated Co promoter when used all these techniques have limitations in determining the structure of the active MoS-individually. Current techniques are notable to provide information of both lateral dimensions along the basal direction and of stacking height Of MoS2 slabs without ambiguity. We report here the use of a synchrotron source for X-ray-scattering measurements of supported MoS2) and C cobalt-promoted MoS2 catalysts. This synchrotron source strongly increases the signal to noise ratio resulting in the detection of diffraction features providing information on the dispersion of the active phase. Synchrotron X-ray measurements in combination with HRTEM can then give a more complete picture of catalyst structure and of the active phases present. Furthermore, supported industrial catalysts that have operated under refinery conditions for more than four years have been studied to better understand the stabilized catalytic phase under these conditions. Industrial hydrotreating conditions induce a "destacking" process resulting in the stabilization of single-layered MoS2-like nanoparticles. This effect has been confirmed On a freshly sulfided model CoMo/Al2O3 catalyst that underwent substantial morphological change leading to the formation of single slabs under HDS conditions. Other structural effects are also reported. This study emphasizes the importance of determining the catalytically stabilized phases under operating hydrotreating conditions as a basis for understanding the activity and selectivity of this class of catalysts. (C) 2004 Elsevier Inc. All rights reserved. C1 Univ Texas, Mat Res Technol Inst, El Paso, TX 79968 USA. Univ Poitiers, CNRS, UMR65O3, Catalyse Chim Organ Lab, F-86000 Poitiers, France. Univ Texas, Dept Chem Engn, Austin, TX 78712 USA. Univ Texas, Ctr Nano & Mat Sci & Technol, Austin, TX 78712 USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA. Ctr Ciencias Mat Condensada, Ensenada 22830, Baja California, Mexico. Inst Mexicano Petr, Mexico City 07730, DF, Mexico. RP De la Rosa, MP (reprint author), Univ Texas, Mat Res Technol Inst, El Paso, TX 79968 USA. EM myrperez@utep.edu RI jose yacaman, miguel/B-5622-2009 NR 45 TC 47 Z9 48 U1 0 U2 20 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 JUL 25 PY 2004 VL 225 IS 2 BP 288 EP 299 DI 10.1016/j.jcat.2004.03.039 PG 12 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 835JC UT WOS:000222477800004 ER PT J AU Wood, BR Reimer, JA Bell, AT Janicke, MT Ott, KC AF Wood, BR Reimer, JA Bell, AT Janicke, MT Ott, KC TI Methanol formation on Fe/Al-MFI via the oxidation of methane by nitrous oxide SO JOURNAL OF CATALYSIS LA English DT Article ID TRANSFORM INFRARED-SPECTROSCOPY; DENSITY-FUNCTIONAL THEORY; X-RAY-ABSORPTION; N2O DECOMPOSITION; FE-SILICALITE; EXTRAFRAMEWORK IRON; SURFACE OXYGEN; FEZSM-5 ZEOLITE; FEMFI ZEOLITES; ZSM-5 ZEOLITE AB A zeolite containing Fe and Al in the framework positions of an MFI structure was produced by hydrothermal synthesis. Subsequent thermal pretreatment caused the Fe to migrate from the lattice and become stabilized at cation-exchange sites associated with framework Ad atoms. The interactions of CH4, N2O, and methanol with this material were investigated by IR spectroscopy and temperature-programmed reactions methods. Upon exposure of thermally pretreated Fe/Al-MFI to methanol, the Bronsted acid protons and hydroxyl groups associated with Si and Fe reacted to form surface methoxy groups. Separate infrared features were observed for methoxy species bound to Si and Fe. Exposure of Fe/Al-MFI to CH4 and N2O above similar to448 K resulted in the formation of methoxy groups bound to both Fe and Si and the simultaneous loss of hydroxyl groups associated with both elements. The formation of methoxy groups was not observed on either Al-MFI or Fe-MFI, suggesting that the active sites in the oxidation of CH4 to methoxy species by N2O are extraframework Fe atoms associated with framework Al. The methoxy groups residing on the catalyst decomposed when the temperature was raised above 523 K and no methanol was observed in the products; however, when the methoxv groups reacted with H2O at 523 K, these groups were rapidly hydrolyzed to form methanol. For Fe/Al-MFI, small amounts of methanol were observed when CH4 and N2O reacted over Fe/Al-MFI at temperatures above 523 K, but the selectivity to this product was less than 2%, the majority of the CH4 undergoing combustion. (C) 2004 Published by Elsevier Inc. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. RP Bell, AT (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. EM bell@cchem.berkeley.edu OI Bell, Alexis/0000-0002-5738-4645 NR 57 TC 65 Z9 66 U1 6 U2 38 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 JUL 25 PY 2004 VL 225 IS 2 BP 300 EP 306 DI 10.1016/j.jcat.2004.04.010 PG 7 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 835JC UT WOS:000222477800005 ER PT J AU Cook, AW Cabot, W Miller, PL AF Cook, AW Cabot, W Miller, PL TI The mixing transition in Rayleigh-Taylor instability SO JOURNAL OF FLUID MECHANICS LA English DT Article ID NUMERICAL-SIMULATION; SCALAR FLUCTUATIONS; RESOLUTION; DEPENDENCE; DIFFUSION AB A large-eddy simulation technique is described for computing Rayleigh-Taylor instability. The method is based on high-wavenumber-preserving subgrid-scale models, combined with high-resolution numerical methods. The technique is verified to match linear stability theory and validated against direct numerical simulation data. The method is used to simulate Rayleigh-Taylor instability at a grid resolution of 1152(3). The growth rate is found to depend on the mixing rate. A mixing transition is observed in the flow, during which an inertial range begins to form in the velocity spectrum and the rate of growth of the mixing zone is temporarily reduced. By measuring growth of the layer in units of dominant initial wavelength, criteria are established for reaching the hypothetical self-similar state of the mixing layer. A relation is obtained between the rate of growth of the mixing layer and the net mass flux through the plane associated with the initial location of the interface. A mix-dependent Atwood number is defined, which correlates well with the entrainment rate, suggesting that internal mixing reduces the layer's growth rate. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Cook, AW (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI Miller, Paul/E-6880-2013 NR 26 TC 102 Z9 102 U1 1 U2 26 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH ST, NEW YORK, NY 10011-4211 USA SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD JUL 25 PY 2004 VL 511 BP 333 EP 362 DI 10.1017/S0022112004009681 PG 30 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 846BG UT WOS:000223289000016 ER PT J AU Mehta, A Valentina, I Ritchie, RO Duerig, TW AF Mehta, A Valentina, I Ritchie, RO Duerig, TW TI On the electronic and mechanical instabilities in Ni50.9Ti49.1 SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT European Symposium on Martensitic Transformation and Shape-Memory CY 2003 CL Royal Agr Coll, Cirencester, ENGLAND SP United Kingdom Engn & Phys Sci Res Council HO Royal Agr Coll DE NiTi; nitinol; R-phase; synchrotron; XANES; martensite ID R-PHASE; TRANSFORMATION; DIFFRACTION; MARTENSITE; ALLOYS; NITI AB Both the superelastic and the shape memory properties of the cubic NiTi alloy known as Nitinol arise from two-phase transitions; from a simple cubic austenite phase to a trigonal R-phase and to a lower symmetry martensite phase. In this article, we speculate that two competing forces drive these transitions. One is "mechanical" in nature and it takes the cubic austenite structure of NiTi to a denser packing arrangement. The other one appears to be "electronic" in nature and it modifies the cubic austenite structure by correlated "Jahn-Teller" type distortions, and perhaps a fluctuation of charge density. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Mat Sci & Engn, Div Mat Sci, Berkeley, CA 94720 USA. Nitinol Devices & Components, Fremont, CA 94539 USA. SRI Int, Menlo Pk, CA 94025 USA. SLAC, Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA. RP Valentina, I (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Mat Sci & Engn, Div Mat Sci, Berkeley, CA 94720 USA. EM valentina.imbeni@sri.com RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 9 TC 9 Z9 9 U1 0 U2 6 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 25 PY 2004 VL 378 IS 1-2 SI SI BP 130 EP 137 DI 10.1016/j.msea.2003.10.349 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 846QE UT WOS:000223329900023 ER PT J AU Somsen, C Khalil-Allafi, J George, EP AF Somsen, C Khalil-Allafi, J George, EP TI Influence of iridium on the martensitic transformation in Ni-Ti shape memory alloys SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT European Symposium on Martensitic Transformation and Shape-Memory CY 2003 CL Royal Agr Coll, Cirencester, ENGLAND SP United Kingdom Engn & Phys Sci Res Council HO Royal Agr Coll DE Ni-Ti-Ir shape memory alloys; precipitation behavior; transmission electron microscopy AB In the binary system Ni-Ir it is known that Ni and Ir form a complete solid solution over the entire composition range. Starting from this, Ni48.5-xTi51.5Irx alloys with x = 0, 2.5, 5 and 10 at.% and a Ni49.5Ti48Ir2.5 alloy have been prepared by arc melting in an argon atmosphere in order to investigate the effect of the substitution on the martensitic transformation. The microstructural characterisation of the samples was mainly done by DSC measurements and transmission electron microscopy (TEM). In accordance with the phase diagram, the binary Ni48.5Ti51.5 alloy contains Ti2Ni precipitates and the matrix exhibits a martensitic phase transformation from the B2-phase to the monoclinic B19'-phase. TEM investigations on the x = 2.5 and 5 at.% Ir samples show that precipitates of type Ti-2(Ni + Ir)(1) are present. Upon cooling these samples, a two-step martensitic transformation occurs from the B2-phase to R-phase to B19'-phase. The martensite start temperature of the B19'-phase decreases with increasing Ir content and, in the vicinity of x = 10 at.% Ir, the martensitic phase transformation disappears completely. In a Ni49.5Ti48Ir2.5 alloy quenched from T = 1000degreesC, only the B2-phase is present. Aging this alloy at T = 500degreesC for t = 100h leads mainly to the growth of (Ni + Ir)(4)Ti-3 precipitates in a B2-type matrix. In addition, a few (Ni + Ir)(3)Ti-2 precipitates can be found. (C) 2004 Elsevier B.V. All rights reserved. C1 Ruhr Univ Bochum, Inst Mat, D-44780 Bochum, Germany. Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44780 Bochum, Germany. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. RP Somsen, C (reprint author), Ruhr Univ Bochum, Inst Mat, Univ Str 150, D-44780 Bochum, Germany. EM christoph.somsen@ruhr-uni-bochum.de; jafar.khalil-allafi@ruhr-uni-bochum.de; georgeep@ornl.gov RI George, Easo/L-5434-2014 NR 6 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 25 PY 2004 VL 378 IS 1-2 SI SI BP 170 EP 174 DI 10.1016/j.msea.2003.10.342 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 846QE UT WOS:000223329900031 ER PT J AU Bond, TC Streets, DG Yarber, KF Nelson, SM Woo, JH Klimont, Z AF Bond, TC Streets, DG Yarber, KF Nelson, SM Woo, JH Klimont, Z TI A technology-based global inventory of black and organic carbon emissions from combustion SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Review DE emission; black carbon; organic carbon; fossil fuel; biofuel; biomass burning ID HEAVY-DUTY DIESEL; POLYCYCLIC AROMATIC-HYDROCARBONS; QUALITY MANAGEMENT DISTRICT; PRIMARY PARTICLE EMISSIONS; SULFUR-DIOXIDE EMISSIONS; VISIBLE-LIGHT ABSORPTION; AEROSOL OPTICAL DEPTH; TRACE-P EXPERIMENT; COAL-FIRED PLANTS; AIR-POLLUTION AB We present a global tabulation of black carbon (BC) and primary organic carbon (OC) particles emitted from combustion. We include emissions from fossil fuels, biofuels, open biomass burning, and burning of urban waste. Previous "bottom-up'' inventories of black and organic carbon have assigned emission factors on the basis of fuel type and economic sector alone. Because emission rates are highly dependent on combustion practice, we consider combinations of fuel, combustion type, and emission controls and their prevalence on a regional basis. Central estimates of global annual emissions are 8.0 Tg for black carbon and 33.9 Tg for organic carbon. These estimates are lower than previously published estimates by 25-35%. The present inventory is based on 1996 fuel-use data, updating previous estimates that have relied on consumption data from 1984. An offset between decreased emission factors and increased energy use since the base year of the previous inventory prevents the difference between this work and previous inventories from being greater. The contributions of fossil fuel, biofuel, and open burning are estimated as 38%, 20%, and 42%, respectively, for BC, and 7%, 19%, and 74%, respectively, for OC. We present a bottom-up estimate of uncertainties in source strength by combining uncertainties in particulate matter emission factors, emission characterization, and fuel use. The total uncertainties are about a factor of 2, with uncertainty ranges of 4.3-22 Tg/yr for BC and 17-77 Tg/yr for OC. Low-technology combustion contributes greatly to both the emissions and the uncertainties. Advances in emission characterization for small residential, industrial, and mobile sources and top-down analysis combining field measurements and transport modeling with iterative inventory development will be required to reduce the uncertainties further. C1 Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA. Natl Ctr Atmospher Res, Boulder, CO 80307 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Iowa, Ctr Global & Reg Environm Res, Iowa City, IA 52242 USA. Int Inst Appl Syst Anal, A-2361 Laxenburg, Austria. RP Univ Illinois, Dept Civil & Environm Engn, MC-250,205 N Mathews Ave, Urbana, IL 61801 USA. EM yark@uiuc.edu; dstreets@anl.gov; woojh21@cgrer.uiowa.edu; klimont@iiasa.ac.at RI Bond, Tami/A-1317-2013; Klimont, Zbigniew/P-7641-2015 OI Bond, Tami/0000-0001-5968-8928; Klimont, Zbigniew/0000-0003-2630-198X NR 305 TC 663 Z9 679 U1 31 U2 77 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 JUL 24 PY 2004 VL 109 IS D14 AR D14203 DI 10.1029/2003JD003697 PG 43 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 841GC UT WOS:000222916600001 ER PT J AU Burr, T Jacobson, A Mielke, A AF Burr, T Jacobson, A Mielke, A TI A global radio frequency noise survey as observed by the FORTE satellite at 800 km altitude SO RADIO SCIENCE LA English DT Article DE global; noise; survey AB [1] We present a global radio frequency noise survey observed from the Fast on-Orbit Recording of Transient Events ( FORTE) satellite at 800 km altitude. This is a survey of squared amplitudes (R-2) in 44 frequency subbands spaced by 0.5 MHz centered at 38 MHz ("low band'') and 44 subbands spaced by 0.5 MHz centered at 130 MHz ("high band''). We define 13 geographic regions and analyze signal-free regions of event data, generated from November 1997 to December 1999, that we assume are representative of the noise of interest ( discussion provided). Because this noise distribution is nonstationary, we use cross validation to sample the distribution across time. Summary statistics presented for R-2 include the mean, median, percentiles, and fractions exceeding thresholds in each of the 44 subbands for the low- and high-frequency bands in each of the geographic regions. Fractions exceeding thresholds are particularly relevant to multiband signal detection. In the low band the R-2 versus frequency plot for each of the 13 regions has peaks in the mean and median at approximately 35 MHz; many regions have peaks at approximately 28 and 45 MHz. The high-band spectral plots are generally slightly smoother with less dramatic peaks than in the low band. The values of 10 x log(10)(R-2) range from approximately - 110 to - 70 for both the low band and high band and are generally slightly larger in the low band. The continental United States (CONUS) region low band is notably higher, with values ranging from - 105 to - 62. Several future satellite projects involving triggered radio frequency broadband signal recordings can benefit from a realistic trigger-noise survey such as done here. C1 Los Alamos Natl Lab, Stat Sci Grp, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Space & Atmospher Sci Grp, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Space Data Syst, Los Alamos, NM 87545 USA. RP Burr, T (reprint author), Los Alamos Natl Lab, Stat Sci Grp, Mail Stop F600, Los Alamos, NM 87545 USA. EM tburr@lanl.gov NR 15 TC 2 Z9 2 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL 24 PY 2004 VL 39 IS 4 AR RS4005 DI 10.1029/2002RS002865 PG 19 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA 841GX UT WOS:000222919000001 ER PT J AU Chromy, BA Perkins, J Heidbrink, JL Gonzales, AD Murphy, GA Fitch, JP McCutchen-Maloney, SL AF Chromy, BA Perkins, J Heidbrink, JL Gonzales, AD Murphy, GA Fitch, JP McCutchen-Maloney, SL TI Proteomic characterization of host response to Yersinia pestis and near neighbors SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article DE Yersinia; host-pathogen interactions; two-dimensional electrophoresis; presymptomatic detection; biomarkers; proteomics ID PROTEIN-KINASE-C; GEL-ELECTROPHORESIS; ELASTASE INHIBITOR; PLAGUE; EXPRESSION; CELLS; PSEUDOTUBERCULOSIS; IDENTIFICATION; PATHOGENS; SEQUENCE AB Host-pathogen interactions result in protein expression changes within both the host and the pathogen. Here, results from proteomic characterization of host response following exposure to Yersinia pestis, the causative agent of plague, and to two near neighbors, Yersinia pseudotuberculosis and Yersinia enterocolitica, are reported. Human monocyte-like cells were chosen as a model for macrophage immune response to pathogen exposure. Two-dimensional electrophoresis followed by mass spectrometry was used to identify host proteins with differential expression following exposure to these three closely related Yersinia species. This comparative proteomic characterization of host response clearly shows that host protein expression patterns are distinct for the different pathogen exposures, and contributes to further understanding of Y. pestis virulence and host defense mechanisms. This work also lays the foundation for future studies aimed at defining biomarkers for presymptomatic detection of plague. (C) 2004 Elsevier Inc. All rights reserved. C1 Lawrence Livermore Natl Lab, Biodef Div, Biol & Biotechnol Res Program, Livermore, CA 94550 USA. Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. Lawrence Livermore Natl Lab, Chem & Biol Natl Secur Program, Livermore, CA 94550 USA. RP McCutchen-Maloney, SL (reprint author), Lawrence Livermore Natl Lab, Biodef Div, Biol & Biotechnol Res Program, Livermore, CA 94550 USA. EM smaloney@llnl.gov NR 35 TC 16 Z9 17 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD JUL 23 PY 2004 VL 320 IS 2 BP 474 EP 479 DI 10.1016/j.bbrc.2004.05.199 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 836PJ UT WOS:000222567700030 PM 15219853 ER PT J AU Qiao, F Song, HY Kim, CA Sawaya, MR Hunter, JB Gingery, M Rebay, I Courey, AJ Bowie, JU AF Qiao, F Song, HY Kim, CA Sawaya, MR Hunter, JB Gingery, M Rebay, I Courey, AJ Bowie, JU TI Derepression by depolymerization: Structural insights into the regulation of Yan by Mae SO CELL LA English DT Article ID ETS TRANSCRIPTION FACTORS; RECEPTOR SAM DOMAIN; KINASE PHOSPHORYLATION; NUCLEAR EXPORT; POINTED DOMAIN; DNA-BINDING; DROSOPHILA; PROTEIN; PATHWAY; FAMILY AB Yan, an ETS family transcriptional repressor, is regulated by receptor tyrosine kinase signaling via the Ras/ MAPK pathway. Phosphorylation and downregulation of Yan is facilitated by a protein called Mae. Yan and Mae interact through their SAM domains. We find that repression by Yan requires the formation of a higher order structure mediated by Yan-SAM polymerization. Moreover, a crystal structure of the Yan-SAM/Mae-SAM complex shows that Mae-SAM specifically recognizes a surface on Yan-SAM that is also required for Yan-SAM polymerization. Mae-SAM binds to Yan-SAM with similar to1000-fold higher affinity than Yan-SAM binds to itself and can effectively depolymerize Yan-SAM. Mutations on Mae that specifically disrupt its SAM domain-dependent interactions with Yan disable the derepression function of Mae in vivo. Depolymerization of Yan by Mae represents a novel mechanism of transcriptional control that sensitizes Yan for regulation by receptor tyrosine kinases. C1 Univ Calif Los Angeles, DOE, Inst Genom & Proteom, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Inst Mol Biol, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA. MIT, Dept Biol, Whitehead Inst, Cambridge, MA 02142 USA. RP Bowie, JU (reprint author), Univ Calif Los Angeles, DOE, Inst Genom & Proteom, Los Angeles, CA 90095 USA. EM bowie@mbi.ucla.edu OI Hunter, Jacob/0000-0003-3479-1309 FU NCI NIH HHS [R01 CA081000]; NIGMS NIH HHS [R01 GM44522] NR 39 TC 65 Z9 65 U1 0 U2 7 PU CELL PRESS PI CAMBRIDGE PA 1100 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138 USA SN 0092-8674 J9 CELL JI Cell PD JUL 23 PY 2004 VL 118 IS 2 BP 163 EP 173 DI 10.1016/j.cell.2004.07.010 PG 11 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 841XQ UT WOS:000222966000006 PM 15260987 ER PT J AU Chylek, P Borel, C AF Chylek, P Borel, C TI Mixed phase cloud water/ice structure from high spatial resolution satellite data SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID OPTICAL-CONSTANTS; SOLAR-RADIATION; BEAUFORT SEA; ICE; ABSORPTION; PHYSICS AB The ratio of satellite level radiances around 0.87 mum to radiances at 1.6 mum is sensitive to the material ( water or ice) of cloud particles. Using the DOE MTI (Multispectral Thermal Imager) satellite based instrument we retrieve the cloud top structure of a mixed phase cloud over the Point Barrow, Alaska, with spatial resolution of about 20 m. We find a high variability on a scale of tens of meters consisting of pockets of pure water, mixed water and ice, and pockets of pure ice. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ New Mexico, Dept Phys, Las Cruces, NM USA. RP Chylek, P (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM chylek@lanl.gov NR 25 TC 19 Z9 19 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 23 PY 2004 VL 31 IS 14 AR L14104 DI 10.1029/2004GL020428 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 841FT UT WOS:000222915600004 ER PT J AU Chen, SF Yakunin, AF Kuznetsova, E Busso, D Pufan, R Proudfoot, M Kim, R Kim, SH AF Chen, SF Yakunin, AF Kuznetsova, E Busso, D Pufan, R Proudfoot, M Kim, R Kim, SH TI Structural and functional characterization of a novel phosphodiesterase from Methanococcus jannaschii SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID PURPLE ACID-PHOSPHATASE; ESCHERICHIA-COLI; CRYSTAL-STRUCTURE; PROTEINS; ENZYME; CRYSTALLOGRAPHY; DATABASE; SITE AB Methanococcus jannaschii MJ0936 is a hypothetical protein of unknown function with over 50 homologs found in many bacteria and Archaea. To help define the molecular ( biochemical and biophysical) function of MJ0936, we determined its crystal structure at 2.4-Angstrom resolution and performed a series of biochemical screens for catalytic activity. The overall fold of this single domain protein consists of a four-layered structure formed by two beta-sheets flanked by alpha-helices on both sides. The crystal structure suggested its biochemical function to be a nuclease, phosphatase, or nucleotidase, with a requirement for some metal ions. Crystallization in the presence of Ni2+ or Mn2+ produced a protein containing a binuclear metal center in the putative active site formed by a cluster of conserved residues. Analysis of MJ0936 against a panel of general enzymatic assays revealed catalytic activity toward bis-p-nitrophenyl phosphate, an indicator substrate for phosphodiesterases and nucleases. Significant activity was also found with two other phosphodiesterase substrates, thymidine 5'-monophosphate p-nitrophenyl ester and p-nitrophenylphosphorylcholine, but no activity was found for cAMP or cGMP. Phosphodiesterase activity of MJ0936 had an absolute requirement for divalent metal ions with Ni2+] and Mn2+ being most effective. Thus, our structural and enzymatic studies have identified the biochemical function of MJ0936 as that of a novel phosphodiesterase. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley Struct Genom Ctr, Berkeley, CA 94720 USA. Univ Toronto, Banting & Best Dept Med Res, Toronto, ON M5G 1L6, Canada. RP Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. EM shkim@lbl.gov RI Yakunin, Alexander/J-1519-2014; OI Yakunin, Alexander/0000-0003-0813-6490 FU NIGMS NIH HHS [GM 62412] NR 29 TC 32 Z9 35 U1 0 U2 4 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 EI 1083-351X J9 J BIOL CHEM JI J. Biol. Chem. PD JUL 23 PY 2004 VL 279 IS 30 BP 31854 EP 31862 DI 10.1074/jbc.M401059200 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 838QA UT WOS:000222726800112 PM 15128743 ER PT J AU Gritti, F Guiochon, G AF Gritti, F Guiochon, G TI Accuracy and precision of adsorption isotherm parameters measured by dynamic HPLC methods SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE adsorption equilibrium; frontal analysis; mobile phase composition; accuracy; precision; adsorption isotherms; phenol ID PHASE LIQUID-CHROMATOGRAPHY; OVERLOADED BAND PROFILES; ELUTION CHROMATOGRAPHY; C-18-BONDED SILICA; REPRODUCIBILITY; REPEATABILITY; HETEROGENEITY; EQUILIBRIUM; PROPAGATION; ENANTIOMERS AB The fluctuations of the column temperature, the composition and the flow rate of the mobile phase affect the accuracy and precision of the adsorption isotherm parameters measured by dynamic HPLC methods. Experimental data were acquired by frontal analysis (FA) for phenol in equilibrium between C-18-bonded Symmetry and a methanol:water mixture (20:80, v/v), at 303 K and a flow rate of 1 mL/min. The fluctuations of the experimental parameters were 0.1 K for the temperature, 0.1% for the mobile phase composition and 0.00 1 mL/min for the flow rate. The best isotherm model was shown to be the tri-Langmuir isotherm. Random errors were calculated and shown to agree with experimental results. Overloaded band profiles of phenol were acquired at low (sample size, 100 muL, concentration 3 g/L) and high (same sample size, concentration 60 g/L) loadings, at seven temperatures (298, 300, 302, 303, 304, 306, and 308 K), for seven mobile phase compositions (methanol 16, 18, 19, 20, 21, 22, and 24%), and with seven mobile phase flow rates (0.95, 0.97, 0.99, 1.00, 1.01, 1.03, and 1.05 mL/min), always keeping two experimental parameters at the values selected for the FA runs. Assuming that the isotherm model stays the same, the inverse method (IM) was used to derive the isotherm parameters in each case. Temperature affects the equilibrium constants according to Van't Hoff law. A temperature change of I K around 303 K causes a relative variation of 1.5% of the high-energy adsorption constant b(3) and of 0.6% of the saturation capacity q(3). The isotherm parameters are very sensitive to the mobile phase composition, especially the highest energy mode. Both adsorption constants b(2) and b(3) follow the linear strength solvent model (LSSM). A methanol volume fraction change of 1% causes a relative decrease of 3.2 and 5.0% of b(2) and b(3), respectively and a 2% decrease of the saturation capacity q(3). Finally, flow rate changes affect only the saturation capacities. A flow rate change of 1% causes a 2% change in the saturation capacity parameters. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. EM guiochon@utk.edu NR 28 TC 27 Z9 27 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD JUL 23 PY 2004 VL 1043 IS 2 BP 159 EP 170 DI 10.1016/j.chroma.2004.05.067 PG 12 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 839TJ UT WOS:000222807500005 PM 15330089 ER PT J AU Ollivault-Shiflett, M Kimball, DB Silks, LAP AF Ollivault-Shiflett, M Kimball, DB Silks, LAP TI Synthesis of chiral C-13,Se-77-labeled selones SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID DERIVATIZING AGENTS; OXAZOLIDINE-2-SELONES; STEREOSELECTIVITY; SPECTROSCOPY; ALCOHOLS; CENTERS; ACID AB Stable isotope-labeled N-acyl selones have been constructed in fewer than four steps from readily available starting materials. Site-specific labeling was achieved using the following synthons: bromo [2-C-13] acetic acid, [C-13]formic acid, and elemental Se-77. These labeled selones have been found to provide unique insights into enolate structure and may be useful in the detection and quantitation of remotely disposed chiral centers in compounds in short supply. C1 Los Alamos Natl Lab, Biosci Div, Biotechnol Spect & Isotope Chem Grp, NIH Natl Stable Isotope Resource, Los Alamos, NM 87545 USA. RP Silks, LAP (reprint author), Los Alamos Natl Lab, Biosci Div, Biotechnol Spect & Isotope Chem Grp, NIH Natl Stable Isotope Resource, MS E529, Los Alamos, NM 87545 USA. EM pete-silks@lanl.gov FU NCRR NIH HHS [RR 02231] NR 16 TC 3 Z9 3 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD JUL 23 PY 2004 VL 69 IS 15 BP 5150 EP 5152 DI 10.1021/jo049747o PG 3 WC Chemistry, Organic SC Chemistry GA 839CJ UT WOS:000222760600046 PM 15255756 ER PT J AU Saxena, S Yuan, P Dhar, SK Senga, T Takeda, D Robinson, H Kornbluth, S Swaminathan, K Dutta, A AF Saxena, S Yuan, P Dhar, SK Senga, T Takeda, D Robinson, H Kornbluth, S Swaminathan, K Dutta, A TI A dimerized coiled-coil domain and an adjoining part of geminin interact with two sites on Cdt1 for replication inhibition SO MOLECULAR CELL LA English DT Article ID EPSTEIN-BARR-VIRUS; DNA-REPLICATION; INITIATION; SYSTEMS; BINDING; ORIGIN; ORIP; ORC AB Geminin is a cellular protein that associates with Cdt1 and inhibits Mcm2-7 loading during S phase. It prevents multiple cycles of replication per cell cycle and prevents episome replication. It also directly inhibits the HoxA11 transcription factor. Here we report that geminin forms a parallel coiled-coil homodimer with atypical residues in the dimer interface. Point mutations that disrupt the dimerization abolish interaction with Cdt1 and inhibition of replication. An array of glutamic acid residues on the coiled-coil domain surface interacts with positive charges in the middle of Cdt1. An adjoining region interacts independently with the N-terminal 100 residues of Cdt1. Both interactions are essential for replication inhibition. The negative residues on the coiled-coil domain and a different part of geminin are also required for interaction with HoxA11. Therefore a rigid cylinder with negative surface charges is a critical component of a bipartite interaction interface between geminin and its cellular targets. C1 Univ Virginia, Dept Biochem & Mol Genet, Charlottesville, VA 22908 USA. Inst Mol & Cell Biol, Singapore, Singapore. Brookhaven Natl Lab, Upton, NY 11973 USA. Duke Univ, Med Ctr, Dept Pharmacol & Canc Biol, Durham, NC 27710 USA. Natl Univ Singapore, Dept Sci Biol, Singapore, Singapore. RP Swaminathan, K (reprint author), Univ Virginia, Dept Biochem & Mol Genet, Charlottesville, VA 22908 USA. EM nathan@imcb.a-star.edu.sg; ad8q@virginia.edu RI Ping, Yuan/A-5469-2010; ASTAR, IMCB/E-2320-2012; Dutta, Anindya/P-3203-2016 FU NCI NIH HHS [R01CA60499]; NIGMS NIH HHS [R01GM67225] NR 25 TC 66 Z9 68 U1 0 U2 1 PU CELL PRESS PI CAMBRIDGE PA 1100 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138 USA SN 1097-2765 J9 MOL CELL JI Mol. Cell PD JUL 23 PY 2004 VL 15 IS 2 BP 245 EP 258 DI 10.1016/j.molcel.2004.06.045 PG 14 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 841UY UT WOS:000222958300012 PM 15260975 ER PT J AU Aubert, B Barate, R Boutigny, D Couderc, F Gaillard, JM Hicheur, A Karyotakis, Y Lees, JP Tisserand, V Zghiche, A Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G LeClerc, C Levi, ME Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Shelkov, VG Telnov, AV Wenzel, WA Ford, K Harrison, TJ Hawkes, CM Morgan, SE Watson, AT Watson, NK Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Abe, K Cuhadar-Donszelmann, T Hearty, C Mattison, TS McKenna, JA Thiessen, D Kyberd, P Teodorescu, L Blinov, VE Bukin, AD Druzhinin, VP Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Eschrich, I Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Gary, JW Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Dahmes, B Levy, SL Long, O Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Eisner, AM Heusch, CA Lockman, WS Schalk, T Schmitz, RE Schumm, BA Seiden, A Spradlin, P Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Abe, T Blanc, F Bloom, P Chen, S Clark, PJ Ford, WT Nauenberg, U Olivas, A Rankin, P Smith, JG van Hoek, WC Zhang, L Harton, JL Hu, T Soffer, A Toki, WH Wilson, RJ Zeng, Q Altenburg, D Brandt, T Brose, J Colberg, T Dickopp, M Feltresi, E Hauke, A Lacker, HM Maly, E Muller-Pfefferkorn, R Nogowski, R Otto, S Schubert, J Schubert, KR Schwierz, R Spaan, B Bernard, D Bonneaud, GR Brochard, F Grenier, P Thiebaux, C Vasileiadis, G Verderi, M Bard, DJ Khan, A Lavin, D Muheim, F Playfer, S Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Sarti, A Treadwell, E Baldini-Ferroli, R Calcaterra, A de Sangro, R Finocchiaro, G Patteri, P Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Brandenburg, G Morii, M Won, E Dubitzky, RS Langenegger, U Bhimji, W Bowerman, DA Dauncey, PD Egede, U Gaillard, JR Morton, GW Nash, JA Taylor, GP Grenier, GJ Lee, SJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Yi, J Davier, M Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Coleman, JP Fry, JR Gabathuler, E Gamet, R Kay, M Parry, RJ Payne, DJ Sloane, RJ Touramanis, C Back, JJ Harrison, PF Mohanty, GB Brown, CL Cowan, G Flack, RL Flaecher, HU George, S Green, MG Kurup, A Marker, CE McMahon, TR Ricciardi, S Salvatore, F Vaitsas, G Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hart, PA Hodgkinson, MC Lafferty, GD Lyon, AJ Williams, JC Farbin, A Hulsbergen, WD Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote, D Taras, P Nicholson, H Cartaro, C Cavallo, N Fabozzi, F Gatto, C Lista, L Monorchio, D Paolucci, P Piccolo, D Sciacca, C Baak, M Raven, G Wilden, L Jessop, CP LoSecco, JM Gabriel, TA Allmendinger, T Brau, B Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Anulli, F Biasini, M Peruzzi, IM Pioppi, M Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Del Gamba, V Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lu, C Miftakov, V Olsen, J Smith, AJS Varnes, EW Bellini, F Cavoto, G Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Li Gioi, L Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Xella, SM Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF Hamel de Monchenault, G Kozanecki, W Langer, M Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Yumiceva, FX Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wittgen, M Wright, DH Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Borean, C Bosisio, L Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Band, HR Dasu, S Datta, M Eichenbaum, AM Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Di Lodovico, F Mihalyi, A Mohapatra, AK Pan, Y Prepost, R Sekula, SJ Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Neal, H AF Aubert, B Barate, R Boutigny, D Couderc, F Gaillard, JM Hicheur, A Karyotakis, Y Lees, JP Tisserand, V Zghiche, A Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G LeClerc, C Levi, ME Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Shelkov, VG Telnov, AV Wenzel, WA Ford, K Harrison, TJ Hawkes, CM Morgan, SE Watson, AT Watson, NK Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Abe, K Cuhadar-Donszelmann, T Hearty, C Mattison, TS McKenna, JA Thiessen, D Kyberd, P Teodorescu, L Blinov, VE Bukin, AD Druzhinin, VP Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Eschrich, I Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Gary, JW Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Dahmes, B Levy, SL Long, O Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Eisner, AM Heusch, CA Lockman, WS Schalk, T Schmitz, RE Schumm, BA Seiden, A Spradlin, P Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Abe, T Blanc, F Bloom, P Chen, S Clark, PJ Ford, WT Nauenberg, U Olivas, A Rankin, P Smith, JG van Hoek, WC Zhang, L Harton, JL Hu, T Soffer, A Toki, WH Wilson, RJ Zeng, Q Altenburg, D Brandt, T Brose, J Colberg, T Dickopp, M Feltresi, E Hauke, A Lacker, HM Maly, E Muller-Pfefferkorn, R Nogowski, R Otto, S Schubert, J Schubert, KR Schwierz, R Spaan, B Bernard, D Bonneaud, GR Brochard, F Grenier, P Thiebaux, C Vasileiadis, G Verderi, M Bard, DJ Khan, A Lavin, D Muheim, F Playfer, S Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Sarti, A Treadwell, E Baldini-Ferroli, R Calcaterra, A de Sangro, R Finocchiaro, G Patteri, P Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Brandenburg, G Morii, M Won, E Dubitzky, RS Langenegger, U Bhimji, W Bowerman, DA Dauncey, PD Egede, U Gaillard, JR Morton, GW Nash, JA Taylor, GP Grenier, GJ Lee, SJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Yi, J Davier, M Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Coleman, JP Fry, JR Gabathuler, E Gamet, R Kay, M Parry, RJ Payne, DJ Sloane, RJ Touramanis, C Back, JJ Harrison, PF Mohanty, GB Brown, CL Cowan, G Flack, RL Flaecher, HU George, S Green, MG Kurup, A Marker, CE McMahon, TR Ricciardi, S Salvatore, F Vaitsas, G Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hart, PA Hodgkinson, MC Lafferty, GD Lyon, AJ Williams, JC Farbin, A Hulsbergen, WD Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote, D Taras, P Nicholson, H Cartaro, C Cavallo, N Fabozzi, F Gatto, C Lista, L Monorchio, D Paolucci, P Piccolo, D Sciacca, C Baak, M Raven, G Wilden, L Jessop, CP LoSecco, JM Gabriel, TA Allmendinger, T Brau, B Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Anulli, F Biasini, M Peruzzi, IM Pioppi, M Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Del Gamba, V Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lu, C Miftakov, V Olsen, J Smith, AJS Varnes, EW Bellini, F Cavoto, G Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Li Gioi, L Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Xella, SM Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF Hamel de Monchenault, G Kozanecki, W Langer, M Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Yumiceva, FX Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wittgen, M Wright, DH Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Borean, C Bosisio, L Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Band, HR Dasu, S Datta, M Eichenbaum, AM Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Di Lodovico, F Mihalyi, A Mohapatra, AK Pan, Y Prepost, R Sekula, SJ Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Neal, H CA BaBar Collaboration TI Observation of the decay B -> J/psi eta K and search for X(3872)-> J/psi eta SO PHYSICAL REVIEW LETTERS LA English DT Article ID MESON DECAYS AB We report the observation of the B meson decay B+/--->J/psietaK(+/-) and evidence for the decay B-0-->J/psietaK(S)(0), using 90x10(6) B(B) over bar events collected at the Y(4S) resonance with the BABAR detector at the SLAC PEP-II e(+)e(-) asymmetric-energy storage ring. We obtain branching fractions of B(B+/--->J/psietaK(+/-))=[10.8+/-2.3(stat)+/-2.4(syst)]x10(-5) and B(B-0-->J/psietaK(S)(0))=[8.4+/-2.6(stat)+/-2.7(syst)]x10(-5). We search for the new narrow mass state, the X(3872), recently reported by the Belle Collaboration, in the decay B+/--->X(3872)K+/-,X(3872)-->J/psieta and determine an upper limit of B[B+/--->X(3872)K+/--->J/psietaK(+/-)]<7.7x10(-6) at 90% confidence level. C1 Phys Particules Lab, F-74941 Annecy Le Vieux, France. Univ Bari, Dipartmento Fis, I-70126 Bari, Italy. Ist Nazl Fis Nucl, I-70126 Bari, Italy. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Bergen, Inst Phys, N-5007 Bergen, Norway. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany. Univ Bristol, Bristol BS8 1TL, Avon, England. Univ British Columbia, Vancouver, BC V6T 1Z1, Canada. Brunel Univ, Uxbridge UB8 3PH, Middx, England. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA. CALTECH, Pasadena, CA 91125 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. Univ Colorado, Boulder, CO 80309 USA. Colorado State Univ, Ft Collins, CO 80523 USA. Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany. Ecole Polytech, LLR, F-91128 Palaiseau, France. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. Florida A&M Univ, Tallahassee, FL 32307 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Harvard Univ, Cambridge, MA 02138 USA. Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy. Ist Nazl Fis Nucl, I-16146 Genoa, Italy. Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany. Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England. Univ Iowa, Iowa City, IA 52242 USA. Iowa State Univ Sci & Technol, Ames, IA 50011 USA. Accelerateur Lineaire Lab, F-91898 Orsay, France. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Liverpool, Liverpool L69 72E, Merseyside, England. Queen Mary Univ London, London E1 4NS, England. Univ London Royal Holloway & Bedford New Coll, Egham TW20 0EX, Surrey, England. Univ Louisville, Louisville, KY 40292 USA. Univ Manchester, Manchester M13 9PL, Lancs, England. Univ Maryland, College Pk, MD 20742 USA. Univ Massachusetts, Amherst, MA 01003 USA. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. McGill Univ, Montreal, PQ H3A 2T8, Canada. Univ Milan, Dipartimento Fis, I-20133 Milan, Italy. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Univ Mississippi, University, MS 38677 USA. Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada. Mt Holyoke Coll, S Hadley, MA 01075 USA. Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy. Ist Nazl Fis Nucl, I-80126 Naples, Italy. Natl Inst Nucl & High Energy Phys, NL-1009 DB Amsterdam, Netherlands. Univ Notre Dame, Notre Dame, IN 46556 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oregon, Eugene, OR 97403 USA. Univ Padua, Dipartimento Fis, I-35131 Padua, Italy. Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Paris 06, Lab Phys Nucl HE, F-75252 Paris, France. Univ Paris 07, Lab Phys Nucl HE, F-75252 Paris, France. Univ Pavia, Dept Elect, I-27100 Pavia, Italy. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy. Ist Nazl Fis Nucl, I-06100 Perugia, Italy. Univ Pisa, Dipartimento Fis, Scuola Normale Super, I-56127 Pisa, Italy. Ist Nazl Fis Nucl, I-56127 Pisa, Italy. Prairie View A&M Univ, Prairie View, TX 77446 USA. Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, I-00185 Rome, Italy. Univ Rostock, D-18051 Rostock, Germany. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CEA Saclay, DSM Dapnia, F-91191 Gif Sur Yvette, France. Univ S Carolina, Columbia, SC 29208 USA. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, Stanford, CA 94305 USA. SUNY Albany, Albany, NY 12222 USA. Univ Tennessee, Knoxville, TN 37996 USA. Univ Texas, Austin, TX 78712 USA. Univ Texas, Richardson, TX 75083 USA. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy. Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Vanderbilt Univ, Nashville, TN 37235 USA. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06511 USA. Univ Basilicata, I-85100 Potenza, Italy. Univ Valencia, CSIC, Inst Fis Corpuscular, IFIC, Valencia, Spain. RP Aubert, B (reprint author), Phys Particules Lab, F-74941 Annecy Le Vieux, France. RI Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Di Lodovico, Francesca/L-9109-2016; Lusiani, Alberto/N-2976-2015; Morandin, Mauro/A-3308-2016; Lusiani, Alberto/A-3329-2016; Della Ricca, Giuseppe/B-6826-2013; Mir, Lluisa-Maria/G-7212-2015; Cavallo, Nicola/F-8913-2012; Lista, Luca/C-5719-2008; Saeed, Mohammad Alam/J-7455-2012; de Groot, Nicolo/A-2675-2009; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Neri, Nicola/G-3991-2012; Forti, Francesco/H-3035-2011; Rotondo, Marcello/I-6043-2012; Patrignani, Claudia/C-5223-2009; de Sangro, Riccardo/J-2901-2012; Sarti, Alessio/I-2833-2012; M, Saleem/B-9137-2013; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; Negrini, Matteo/C-8906-2014; Grancagnolo, Sergio/J-3957-2015; Kravchenko, Evgeniy/F-5457-2015; Peters, Klaus/C-2728-2008; Lo Vetere, Maurizio/J-5049-2012 OI Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky, Yury/0000-0001-8496-9975; Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Di Lodovico, Francesca/0000-0003-3952-2175; Lusiani, Alberto/0000-0002-6876-3288; Morandin, Mauro/0000-0003-4708-4240; Lusiani, Alberto/0000-0002-6876-3288; Della Ricca, Giuseppe/0000-0003-2831-6982; Mir, Lluisa-Maria/0000-0002-4276-715X; Saeed, Mohammad Alam/0000-0002-3529-9255; Bellini, Fabio/0000-0002-2936-660X; Neri, Nicola/0000-0002-6106-3756; Forti, Francesco/0000-0001-6535-7965; Rotondo, Marcello/0000-0001-5704-6163; Patrignani, Claudia/0000-0002-5882-1747; de Sangro, Riccardo/0000-0002-3808-5455; Sarti, Alessio/0000-0001-5419-7951; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; Negrini, Matteo/0000-0003-0101-6963; Grancagnolo, Sergio/0000-0001-8490-8304; Peters, Klaus/0000-0001-7133-0662; Lo Vetere, Maurizio/0000-0002-6520-4480 NR 26 TC 285 Z9 290 U1 0 U2 9 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 JUL 23 PY 2004 VL 93 IS 4 AR 041801 DI 10.1103/PhysRevLett.93.041801 PG 7 WC Physics, Multidisciplinary SC Physics GA 840KC UT WOS:000222856400014 PM 15600911 ER PT J AU Bester, G Shumway, J Zunger, A AF Bester, G Shumway, J Zunger, A TI Theory of excitonic spectra and entanglement engineering in dot molecules SO PHYSICAL REVIEW LETTERS LA English DT Article ID INAS/GAAS QUANTUM DOTS; ELECTRONIC-STRUCTURE; INFORMATION; STATES; SINGLE; ARRAY AB We present results of correlated pseudopotential calculations of an exciton in a pair of vertically stacked InGaAs/GaAs dots. Competing effects of strain, geometry, and band mixing lead to many unexpected features missing in contemporary models. The first four excitonic states are all optically active at small interdot separation, due to the broken symmetry of the single-particle states. We quantify the degree of entanglement of the exciton wave functions and show its sensitivity to interdot separation. We suggest ways to spectroscopically identify and maximize the entanglement of exciton states. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA. RP Bester, G (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Bester, Gabriel/I-4414-2012; Zunger, Alex/A-6733-2013 OI Bester, Gabriel/0000-0003-2304-0817; NR 28 TC 72 Z9 72 U1 0 U2 5 PU AMERICAN 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 JUL 23 PY 2004 VL 93 IS 4 AR 047401 DI 10.1103/PhysRevLett.93.047401 PG 4 WC Physics, Multidisciplinary SC Physics GA 840KC UT WOS:000222856400056 PM 15323791 ER PT J AU Kretzer, S Olness, F Pumplin, J Stump, D Tung, WK Reno, MH AF Kretzer, S Olness, F Pumplin, J Stump, D Tung, WK Reno, MH TI Parton structure of the nucleon and precision determination of the Weinberg angle in neutrino scattering SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUARK-ANTIQUARK ASYMMETRY; STRANGE SEA; QCD AB A next-to-leading-order (NLO) calculation of neutrino cross sections, including power-suppressed mass terms, is used to evaluate the Paschos-Wolfenstein ratio, in order to better assess the validity and significance of the NuTeV anomaly. We study the shift of sin(2)theta(W) obtained in calculations with parton distribution function sets that allow s(x)not equal(s) over bar (x), enabled by recent neutrino dimuon data from CCFR and NuTeV. The extracted value of sin(2)theta(W) is closely correlated with the strangeness asymmetry. Taken together with recent developments of possible isospin violation and electroweak effects, our results suggest that the new dimuon data, the Weinberg angle measurement, and other data sets used in global QCD parton structure analysis can all be consistent within the standard model. A full NLO analysis of the actual experimental measurement will help to clarify this issue further. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. So Methodist Univ, Dept Phys, Dallas, TX 75275 USA. Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. RP Kretzer, S (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 30 TC 51 Z9 51 U1 0 U2 0 PU AMERICAN 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 JUL 23 PY 2004 VL 93 IS 4 AR 041802 DI 10.1103/PhysRevLett.93.041802 PG 4 WC Physics, Multidisciplinary SC Physics GA 840KC UT WOS:000222856400015 PM 15323750 ER PT J AU Niemann, C Glenzer, SH Knight, J Divol, L Williams, EA Gregori, G Cohen, BI Constantin, C Froula, DH Montgomery, DS Johnson, RP AF Niemann, C Glenzer, SH Knight, J Divol, L Williams, EA Gregori, G Cohen, BI Constantin, C Froula, DH Montgomery, DS Johnson, RP TI Observation of the parametric two-ion decay instability with Thomson scattering SO PHYSICAL REVIEW LETTERS LA English DT Article ID STIMULATED BRILLOUIN-SCATTERING; ION WAVES; SATURATION; PLASMAS AB We present the first direct experimental observation of the parametric two-ion decay instability of ion-acoustic waves driven by a high intensity (5x10(15) W cm(-2)) laser beam in a laser produced high-Z plasma. Using two separate Thomson scattering diagnostics simultaneously, we directly measure the scattering from thermal ion-acoustic fluctuations, the primary ion waves that are driven to large amplitudes by the high intensity beam, and the two-ion decay products. The decay products are shown to be present only where the interaction takes place and their k spectrum is broad. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. OI Montgomery, David/0000-0002-2355-6242 NR 16 TC 18 Z9 18 U1 1 U2 4 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 JUL 23 PY 2004 VL 93 IS 4 AR 045004 DI 10.1103/PhysRevLett.93.045004 PG 4 WC Physics, Multidisciplinary SC Physics GA 840KC UT WOS:000222856400034 PM 15323769 ER PT J AU Seidel, A Lee, DH AF Seidel, A Lee, DH TI Flux period, spin gap, and pairing in the one-dimensional t-J-J(') model SO PHYSICAL REVIEW LETTERS LA English DT Article ID T-J MODEL; CORRELATED HUBBARD-MODEL; VALENCE-BOND STATE; SUPERCONDUCTIVITY; QUANTIZATION; PHASE; CHAIN; RINGS AB Using the factorization of the wave function in the t-J-J(') model at small exchange couplings, we demonstrate the connection between the existence of a spin gap and an hc/2e flux periodicity of the ground state energy. We conjecture that all spin-gapped SU(2)-invariant Luttinger liquids have hc/2e flux periodicity, and that this is connected to the fact that a gapped spin-1/2 chain always breaks translational symmetry by doubling the unit cell. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. NR 25 TC 8 Z9 8 U1 0 U2 0 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 JUL 23 PY 2004 VL 93 IS 4 AR 046401 DI 10.1103/PhysRevLett.93.046401 PG 4 WC Physics, Multidisciplinary SC Physics GA 840KC UT WOS:000222856400042 PM 15323777 ER PT J AU Xu, CK Moore, JE AF Xu, CK Moore, JE TI Strong-weak coupling self-duality in the two-dimensional quantum phase transition of p+ip superconducting arrays SO PHYSICAL REVIEW LETTERS LA English DT Article ID STATE AB The 2D quantum phase transition that occurs in a square lattice of Josephson-coupled p+/-ip superconductors is an example of how four-body interactions in d=2 reproduce nonperturbative effects caused by two-body interactions in d=1. The ordered phase has an unconventional "bond order" of the local T-breaking variable. This problem can be analyzed using an exact self-duality; this duality in classical notation is the 3D generalization of the Kramers-Wannier duality of the 2D Ising model, and there are similar exact dualities in dimensions dgreater than or equal to3. We discuss the excitation spectrum and experimental signatures of the ordered and disordered phases, and the relationship between our model and previously studied behavior of 2D boson models with four-boson interactions. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Xu, CK (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Moore, Joel/O-4959-2016 OI Moore, Joel/0000-0002-4294-5761 NR 18 TC 45 Z9 46 U1 1 U2 1 PU AMERICAN 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 JUL 23 PY 2004 VL 93 IS 4 AR 047003 DI 10.1103/PhysRevLett.93.047003 PG 4 WC Physics, Multidisciplinary SC Physics GA 840KC UT WOS:000222856400051 PM 15323786 ER PT J AU Reusser, LJ Bierman, PR Pavich, MJ Zen, EA Larsen, J Finkel, R AF Reusser, LJ Bierman, PR Pavich, MJ Zen, EA Larsen, J Finkel, R TI Rapid late Pleistocene incision of Atlantic passive-margin river gorges SO SCIENCE LA English DT Article ID EROSION THRESHOLDS; BEDROCK INCISION; SEA-LEVEL; TERRACES; CLIMATE; UPLIFT; BE-10; AL-26 AB The direct and secondary effects of rapidly changing climate caused large rivers draining the Atlantic passive margin to incise quickly into bedrock beginning about 35,000 years ago. Measured in samples from bedrock fluvial terraces, 10-beryllium shows that both the Susquehanna and Potomac Rivers incised 10- to 20-meter-deep gorges along steep, convex lower reaches during the last glacial cycle. This short-lived pulse of unusually rapid down-cutting ended by 13,000 to 14,000 years ago. The timing and rate of downcutting are similar on the glaciated Susquehanna and unglaciated Potomac Rivers, indicating that regional changes, not simply glacial meltwater, initiated incision. C1 Univ Vermont, Dept Geol, Burlington, VT 05401 USA. Univ Vermont, Sch Nat Resources, Burlington, VT 05401 USA. US Geol Survey, Natl Ctr, Reston, VA 20192 USA. Univ Maryland, Dept Geol, College Pk, MD 20742 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RP Reusser, LJ (reprint author), Univ Vermont, Dept Geol, Burlington, VT 05401 USA. EM lreusser@uvm.edu NR 33 TC 44 Z9 44 U1 0 U2 10 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 JUL 23 PY 2004 VL 305 IS 5683 BP 499 EP 502 DI 10.1126/science.1097780 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 840AH UT WOS:000222828900034 PM 15273389 ER PT J AU Miller, JL McCunn, LR Krisch, MJ Butler, LJ Shu, J AF Miller, JL McCunn, LR Krisch, MJ Butler, LJ Shu, J TI Dissociation of the ground state vinoxy radical and its photolytic precursor chloroacetaldehyde: Electronic nonadiabaticity and the suppression of the H+ketene channel SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID 193 NM; PHOTODISSOCIATION; DYNAMICS; PHOTOIONIZATION; INTERSECTIONS; BEAM AB This work is a study of the competition between the two unimolecular reaction channels available to the vinoxy radical (CH2CHO), C-H fission to form H+ketene, and isomerization to the acetyl radical (CH3CO) followed by C-C fission to form CH3 + CO. Chloroacetaldehyde (CH2ClCHO) was used as a photolytic precursor to the vinoxy radical in its ground state; photodissociation of chloroacetaldehyde at 193 nm produces vinoxy radicals with internal energies spanning the G3// B3LYP calculated barriers to the two available unimolecular reaction channels. The onset of the CH3 + CO channel, via isomerization to the acetyl radical, was found to occur at an internal energy of 41 +/- 2 kcal/mol, agreeing well with our calculated isomerization barrier of 40.8 kcal/mol. Branching to the H+ketene channel was too small to be,detected; we conclude that the branching to the H+ketene channel must be at least a factor of 200 lower than what is predicted by a RRKM analysis based on our electronic structure calculations. This dramatic result may be explained in part by the presence of a conical intersection at planar geometries along the reaction coordinate leading to H+ketene, which results in electronically nonadiabatic recrossing of the transition state. (C) 2004 American Institute of Physics. C1 Univ Chicago, James Franck Inst, Chicago, IL 60637 USA. Univ Chicago, Dept Chem, Chicago, IL 60637 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Butler, LJ (reprint author), Univ Chicago, James Franck Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA. EM L-Butler@uchicago.edu NR 24 TC 27 Z9 27 U1 1 U2 8 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 22 PY 2004 VL 121 IS 4 BP 1830 EP 1838 DI 10.1063/1.1765653 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 839KL UT WOS:000222783900021 PM 15260734 ER PT J AU Mitchell, MC Gallo, M Nenoff, TM AF Mitchell, MC Gallo, M Nenoff, TM TI Computer simulations of adsorption and diffusion for binary mixtures of methane and hydrogen in titanosilicates SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MONTE-CARLO SIMULATIONS; MOLECULAR-DYNAMICS SIMULATIONS; SELF-DIFFUSIVITY; ZEOLITE-A; SILICALITE; ETS-10; FAUJASITE; MEMBRANES; CF4; MD AB Equilibrium molecular dynamics (MD) simulations of equimolar mixtures of hydrogen and methane were performed in three different titanosilicates: naturally occurring zorite and two synthetic titanosilicates, ETS-4 and ETS-10. In addition, single-component MD simulations and adsorption isotherms generated using grand canonical Monte Carlo simulations were performed to support the mixture simulations. The goal of this study was to determine the best membrane material to carry out hydrogen/methane separations. ETS-10 has a three-dimensional pore network. ETS-4 and zorite have two-dimensional. pore networks. The simulations carried out in this study show that the increased porosity of ETS-10 results in self-diffusion coefficients for both hydrogen and methane that are higher in ETS-10 than in either ETS-4 or zorite. Methane only showed appreciable displacement in ETS-10. The ability of the methane molecules to move in all three directions in ETS-10 was demonstrated by the high degree of isotropy shown in the values of the x, y, and z components of the self-diffusion coefficient for methane in ETS-10. From our simulations we conclude that ETS-10 would be better suited for fast industrial separations' of hydrogen and methane. However, the separation would not result in a pure hydrogen stream. In contrast, ETS-4 and zorite would act as true molecular sieves for separations of hydrogen and methane, as the methane would not move through membranes made of these materials. This was indicated by the near-zero self-diffusion coefficient of methane in ETS-4 and zorite. (C) 2004 American Institute of Physics. C1 New Mexico State Univ, Dept Chem Engn, Las Cruces, NM 88003 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Mitchell, MC (reprint author), New Mexico State Univ, Dept Chem Engn, POB 30001,MSC 3805, Las Cruces, NM 88003 USA. RI Gallo, Marco/B-7345-2012; Mitchell, Martha/A-9002-2013 OI Mitchell, Martha/0000-0003-0054-1977 NR 51 TC 30 Z9 30 U1 0 U2 14 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 22 PY 2004 VL 121 IS 4 BP 1910 EP 1916 DI 10.1063/1.1766019 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 839KL UT WOS:000222783900030 PM 15260743 ER PT J AU Jankowiak, R Rogan, EG Cavalieri, EL AF Jankowiak, R Rogan, EG Cavalieri, EL TI Role of fluorescence line-narrowing spectroscopy and related luminescence-based techniques in the elucidation of mechanisms of tumor initiation by polycyclic aromatic hydrocarbons and estrogens SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Review ID BREAST EPITHELIAL-CELLS; BENZOPYRENE DNA-ADDUCTS; LASER-INDUCED FLUORESCENCE; HOLE-BURNING SPECTROSCOPY; POLYACRYLAMIDE-GEL ELECTROPHORESIS; MOLECULAR MIXED-CRYSTALS; MOUSE SKIN PAPILLOMAS; CAPILLARY-ELECTROPHORESIS; SPECTRAL CHARACTERIZATION; CATECHOL ESTROGENS AB Formation of DNA adducts by various carcinogens represents the first critical event in the mechanism of tumor initiation. The carcinogenic polycyclic aromatic hydrocarbons (PAHs) are biologically activated by two major mechanisms: one-electron oxidation to produce radical cations and monooxygenation to form bay-region diol epoxides. The PAH-DNA adducts formed by these mechanisms are stable adducts that remain in DNA unless removed by repair and depurinating adducts that are lost from DNA by cleavage of the glycosyl bond. Identification of PAH-DNA adducts has relied heavily on low-temperature, laser-based fluorescence spectroscopy under non-line-narrowing (NLN) and line-narrowing (FLN) conditions. These spectroscopies can be used for chemical identification, conformational analysis, and/or probing the microenvironment of DNA (or protein) adducts. Small and co-workers have pioneered the use of FLN spectroscopy in this research. For example, the structures of the depurinating adducts formed by the PAHs benzo[a]pyrene, 7,12-dimethylbenz[a]anthracene, and dibenzo[a,l]pyrene have been elucidated. Understanding of the mechanism of tumor initiation by PAHs has relied on identifying and quantifying the DNA adducts formed. The insights gained from the study of PAH-DNA adducts enabled us to discover the estrogen metabolites that form depurinating DNA adducts and can be potential endogenous initiators of human cancer. Small and co-workers have also studied the estrogen-DNA adducts and estrogen-thioether conjugates by using FLNS and related luminescence-based techniques and have demonstrated that the level of the 4-hydroxyestrone-1-N3-adenine depurinating adduct in breast tissue from a woman with breast carcinoma was significantly higher than that in breast tissue from women without breast cancer. The fluorescence- and phosphorescence-based techniques they are developing will be applied to analyzing estrogen adducts and conjugates as biomarkers of susceptibility to breast and other types of human cancer. C1 Iowa State Univ, US Dept Energy, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Univ Nebraska, Med Ctr, Eppley Inst Res Canc, Omaha, NE 68198 USA. RP Jankowiak, R (reprint author), Iowa State Univ, US Dept Energy, Ames Lab, Ames, IA 50011 USA. EM jankowiak@ameslab.gov; ecavalie@unmc.edu NR 160 TC 10 Z9 10 U1 3 U2 12 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 JUL 22 PY 2004 VL 108 IS 29 BP 10266 EP 10283 DI 10.1021/jp0402838 PG 18 WC Chemistry, Physical SC Chemistry GA 839DH UT WOS:000222763000008 ER PT J AU Linden, PA Zimmermann, J Brixner, T Holt, NE Vaswani, HM Hiller, RG Fleming, GR AF Linden, PA Zimmermann, J Brixner, T Holt, NE Vaswani, HM Hiller, RG Fleming, GR TI Transient absorption study of peridinin and peridinin-chlorophyll a-protein after two-photon excitation SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID CHARGE-TRANSFER STATE; ENERGY-TRANSFER; AMPHIDINIUM-CARTERAE; EXCITED-STATES; SPECTROSCOPIC PROPERTIES; CAROTENOID PERIDININ; S-1 STATE; COMPLEXES; DYNAMICS; SINGLET AB lTwo-photon excited pump-probe spectroscopy was carried out on the peridinin-chlorophyll a-protein complex (PCP) and on the peridinin molecule in methanol solution. Our data are consistent with earlier two-photon fluorescence excitation spectral(1.2) and lead to the conclusion that, for peridinin in methanol solution, a separate two-photon-allowed transition exists just to the red of the strongly allowed S-0 - S-2(B-u(+)) band. In the PCP complex, two-photon excitation at 1150 nm can also be interpreted as preparing a new state. In both cases, the new state is most likely the S-1(Ag-) state. It is not yet possible to conclude experimentally whether peridinin possesses a single low lying state with solvent dependent properties or two distinct states, the A(g)(-) and the charge transfer states. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Macquarie Univ, Dept Biol Sci, N Ryde, NSW 2109, Australia. RP Fleming, GR (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. EM grfleming@lbl.gov RI Zimmermann, Joerg/B-7725-2009; Brixner, Tobias/S-1451-2016 OI Brixner, Tobias/0000-0002-6529-704X NR 19 TC 54 Z9 56 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD JUL 22 PY 2004 VL 108 IS 29 BP 10340 EP 10345 DI 10.1021/jp031331b PG 6 WC Chemistry, Physical SC Chemistry GA 839DH UT WOS:000222763000016 ER PT J AU Riley, K Jankowiak, R Ratsep, M Small, GJ Zazubovich, V AF Riley, K Jankowiak, R Ratsep, M Small, GJ Zazubovich, V TI Evidence for highly dispersive primary charge separation kinetics and gross heterogeneity in the isolated PSII reaction center of green plants SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID II REACTION-CENTER; REACTION-CENTER COMPLEX; EXCITED-STATE DYNAMICS; HOLE-BURNED SPECTRA; RED ABSORPTION-BAND; PHOTOSYSTEM-II; ENERGY-TRANSFER; CHLOROPHYLL-A; CRYSTAL-STRUCTURE; PHOTOSYNTHETIC COMPLEXES AB Despite the availability of an X-ray structure and many spectroscopic studies, important issues related to structural heterogeneity, excitonic structure, primary charge separation (CS), and excitation energy transfer dynamics of the isolated reaction center (RC) of photosystem II (PS II) remain unresolved. The issues addressed here include (1) whether the primary CS kinetics at low temperatures are highly dispersive (due to structural heterogeneity), as proposed by Prokhorenko and Holzwarth (J. Phys. Chem. B 2000, 104, 11563), and (2) the nature of the weak lowest-energy Q(y) absorption band at similar to684 nm that appears as a shoulder on the intense primary electron donor band (P680). Results of low-temperature nonphotochemical hole burning (NPHB) and triplet bottleneck hole burning (TBHB) spectroscopic experiments (including effects of pressure and external electric (Stark) fields) are presented for the RC from spinach with one of the two peripheral chlorophylls removed. Both NPHB and TBHB are observed with excitations within the P680 and 684 nm bands. Both types of hole spectra exhibit a weak dependence on the burn wavelength (lambda(B)) between 680 and 686 nm. Furthermore, the permanent dipole moment change (f Deltamu), as determined by Stark-NPHB spectroscopy, is identical (0.9 +/- 0.1 D) for the two bands, as are the linear electron-phonon coupling parameters (Huang-Rhys factors S-17 = 0.7 and S-80 = 0.2 for 17 and 80 cm(-1) phonons). These similarities, together with published fluorescence line narrowed spectra lead us to favor the gross heterogeneity model in which the 684 nm band is the primary electron donor band (P684) of a subset of RCs that may be more intact than P680-type RCs. It is concluded, based also on the linear pressure shift rates for the P680 and 684 nm bands, that population of either P680* (* equivalent to Q(y) state) or P684* results in both TBHB (due to charge recombination of the primary radical ion pair) and NPHB. It was found that the values of parameters (e.g., electron-phonon coupling, site distribution function) used to simulate the NPHB spectra also provided reasonable fits to the TBHB spectra. Acceptable theoretical simulations of the line-narrowed TBHB spectra were not possible using a single primary CS time. However, satisfactory fits (including lambda(B) and burn intensity dependences) were achieved using a distribution of CS times. The observed TBHB is due to P680- and P684-type RCs with the faster CS kinetics since the persistent nonphotochemical holes were saturated prior to measuring the TBHB spectra. (RCs exhibiting the most efficient NPHB have slower CS kinetics as well as higher fluorescence quantum yields.) For the TBHB spectra, the same distribution (Weibull) was used for the P680- and P684-type RCs. The distribution describes quite well the distribution of Prokhorenko and Holzwarth for CS times shorter than 25 ps. Finally, the data indicate that electron exchange contributes only weakly (relative to electrostatics) to the inter-pigment excitonic interactions. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia. RP US DOE, Ames Lab, Ames, IA 50011 USA. EM valterz@iastate.edu NR 59 TC 20 Z9 21 U1 1 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 JUL 22 PY 2004 VL 108 IS 29 BP 10346 EP 10356 DI 10.1021/jp0495621 PG 11 WC Chemistry, Physical SC Chemistry GA 839DH UT WOS:000222763000017 ER PT J AU Zheng, JJ Li, HW Yeung, ES AF Zheng, JJ Li, HW Yeung, ES TI Manipulation of single DNA molecules via lateral focusing in a PDMS/glass microchannel SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID CAPILLARY-ELECTROPHORESIS; RADIAL MIGRATION; FLOW; POLYDIMETHYLSILOXANE; DIAGNOSIS; CHANNELS; CHIP AB In a hybridized microchannel made of poly(dimethylsiloxane) (PDMS) and glass, nonuniform electroosmotic flow (EOF) was created when an electric field was applied. PDMS and glass pieces were bonded at room temperature after oxidization with oxygen plasma. After oxidization, the PDMS surface has a higher zeta (zeta) potential than that of glass, which results in faster EOF at that surface. When the channel has a large aspect ratio (width much greater than depth), the EOF can be considered as a two-dimensional gradient shear flow. By using a scanning confocal fluorescence microscope, we demonstrated that negatively charged DNA molecules were focused by the nonuniform EOF and the electric field into a thin layer at the glass surface of about one-fifth of the channel depth. This phenomenon was applied to selectively detect target DNA molecules using evanescent-field excitation. Streptavidin-conjugated quantum dots (QD) were used to selectively bind biotinylated DNA. After applying an electric field, free QD remained randomly distributed within the channel. Nonbiotinylated DNA molecules were focused onto the glass surface, but they were not labeled and thus nonfluorescent. Therefore, the increase in molecule count after application of the electric field can be solely attributed to QD-DNA complexes which were focused onto the glass surface. This method does not require the separation of excessive probes (QD) and can be operated continuously to achieve high throughput. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Yeung, ES (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. EM yeung@ameslab.gov OI Li, Hung Wing/0000-0003-4840-1965 NR 26 TC 10 Z9 10 U1 0 U2 5 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 JUL 22 PY 2004 VL 108 IS 29 BP 10357 EP 10362 DI 10.1021/jp0377937 PG 6 WC Chemistry, Physical SC Chemistry GA 839DH UT WOS:000222763000018 ER PT J AU Hsin, TM Zazubovich, V Hayes, JM Small, GJ AF Hsin, TM Zazubovich, V Hayes, JM Small, GJ TI Red antenna states of PSI of cyanobacteria: Stark effect and interstate energy transfer SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID PHOTOSYSTEM-I PARTICLES; SP PCC 6803; SYNECHOCOCCUS-ELONGATUS; REACTION CENTERS; RHODOPSEUDOMONAS-ACIDOPHILA; RHODOBACTER-SPHAEROIDES; LOW-TEMPERATURE; PRESSURE SHIFT; SPECTRAL HOLES; GREEN PLANTS AB Previously, Stark hole-burning spectroscopy and effects of pressure at low temperature were used to determine the number of red antenna states of the cyanobacteria Synechococcus elongatus and Synechocystis PCC6803 (Hayes, J. M.; Matsuzaki, S.; Ratsep, M.; Small, G. J. J. Phys. Chem. B 2000 104, 5625. Zazubovich, V.; Matsuzaki, S.; Johnson, T. W.; Hayes, J. M.; Chitnis, P. R.; Small Chem. Phys. 2002, 275, 47). Distinct differences in linear pressure shift rates, the magnitude of the permanent dipole moment change, fDeltamu, and electron-phonon coupling strength clearly show that in Synechococcus there are three red states (C708, C715, and C719), whereas in Synechocystis, there are two red states (C708 and C714). In the Stark hole-burning spectra of the lowest states of these two systems, hole splitting was not observed, only hole broadening, for excitation polarization both parallel and perpendicular to the Stark field direction. The theories of Stark hole burning predict that splitting should occur for one of the polarizations unless there is a large, random component to the induced dipole moment change, Deltamu(ind), which is not expected to be the case for pigment-protein complexes in which the orientations of pigments relative to the protein matrix are nonrandom. In this paper, Stark hole burning at higher resolution is used to reinvestigate the absence of splitting. However, even at higher resolution, no splitting is detected. This is explained by invoking large variations of the inherent dipole moment change Deltamu(0) of the dimer (the origin of the red-state absorption) rather than of the induced dipole moment change. These arise from a distribution of the relative orientations and separations between the components of the dimer. This distribution also results in a random component of the polarizability change tensor, Deltaalpha. The random components of Deltamu(0) and Deltaalpha not only obscure the Stark splitting but also cause the large inhomogeneous broadening observed for these lowest-energy red states. Temperature-dependent hole widths were also measured for C708 and C714 of Synechocystis. For C714, a T-1.3 temperature dependence was observed, consistent with dephasing by the disordered protein matrix. At 708 nm, however, much higher fluences were required to saturate the absorption of the blue edge of the C714 band and then begin to burn C708. The contribution of the C708 component to the broadening was weakly temperature dependent over the range measured, 2 to 14 K. This contribution is due to energy transfer from C708 to C714, and the width measured corresponds to an energy-transfer time of 6 ps. This observation provides further proof of the existence of two red antenna states, C708 and C714. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. US DOE, Ames Lab, Ames, IA 50011 USA. RP Zazubovich, V (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. EM valterz@iastate.edu NR 35 TC 16 Z9 16 U1 1 U2 1 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 JUL 22 PY 2004 VL 108 IS 29 BP 10515 EP 10521 DI 10.1021/jp049572m PG 7 WC Chemistry, Physical SC Chemistry GA 839DH UT WOS:000222763000037 ER PT J AU Kouri, DJ Vijay, A Hoffman, DK AF Kouri, DJ Vijay, A Hoffman, DK TI Inverse scattering theory: Strategies based on the volterra inverse series for acoustic scattering SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article AB We consider the necessity of half-off-shell transition-matrix elements (near-field) information on iterative approaches to the inverse acoustic scattering problem. We then show that, because of the manner in which half-off-shell effects enter, the recently introduced Volterra inverse series correctly predicts the first two moments of the interaction, while the Fredholm inverse series is correct only for the first moment. Finally, we demonstrate that the Volterra approach provides a method for exactly obtaining interactions that can be written as a sum of delta functions. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Univ Houston, Dept Chem, Houston, TX 77204 USA. Univ Houston, Dept Math & Phys, Houston, TX 77204 USA. RP Iowa State Univ, Dept Chem, Ames, IA 50011 USA. EM hoffman@ameslab.gov NR 17 TC 3 Z9 3 U1 0 U2 2 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 JUL 22 PY 2004 VL 108 IS 29 BP 10522 EP 10528 DI 10.1021/jp049533a PG 7 WC Chemistry, Physical SC Chemistry GA 839DH UT WOS:000222763000038 ER PT J AU Xiao, M Martin, I Yablonovitch, E Jiang, HW AF Xiao, M Martin, I Yablonovitch, E Jiang, HW TI Electrical detection of the spin resonance of a single electron in a silicon field-effect transistor SO NATURE LA English DT Article ID MAGNETIC-RESONANCE AB The ability to manipulate and monitor a single-electron spin using electron spin resonance is a long-sought goal. Such control would be invaluable for nanoscopic spin electronics, quantum information processing using individual electron spin qubits and magnetic resonance imaging of single molecules. There have been several examples(1,2) of magnetic resonance detection of a single-electron spin in solids. Spin resonance of a nitrogen-vacancy defect centre in diamond has been detected optically(3), and spin precession of a localized electron spin on a surface was detected(4,5) using scanning tunnelling microscopy. Spins in semiconductors are particularly attractive for study because of their very long decoherence times(6). Here we demonstrate electrical sensing of the magnetic resonance spin-flips of a single electron paramagnetic spin centre, formed by a defect in the gate oxide of a standard silicon transistor. The spin orientation is converted to electric charge, which we measure as a change in the source/drain channel current. Our set-up may facilitate the direct study of the physics of spin decoherence, and has the practical advantage of being composed of test transistors in a conventional, commercial, silicon integrated circuit. It is well known from the rich literature of magnetic resonance studies that there sometimes exist structural paramagnetic defects(7) near the Si/SiO(2) interface. For a small transistor, there might be only one isolated trap state that is within a tunnelling distance of the channel, and that has a charging energy close to the Fermi level. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA. RP Jiang, HW (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. EM jiangh@physics.ucla.edu NR 19 TC 216 Z9 219 U1 6 U2 62 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD JUL 22 PY 2004 VL 430 IS 6998 BP 435 EP 439 DI 10.1038/nature02727 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 839RD UT WOS:000222801400037 PM 15269763 ER PT J AU Saunders, A Anaya, JM Bowles, TJ Filippone, BW Geltenbort, P Hill, RE Hino, M Hoedl, S Hogan, GE Ito, TM Jones, KW Kawai, T Kirch, K Lamoreaux, SK Liu, CY Makela, M Marek, LJ Martin, JW Morris, CL Mortensen, RN Pichlmaier, A Seestrom, SJ Serebrov, A Smith, D Teasdale, W Tipton, B Vogelaar, RB Young, AR Yuan, J AF Saunders, A Anaya, JM Bowles, TJ Filippone, BW Geltenbort, P Hill, RE Hino, M Hoedl, S Hogan, GE Ito, TM Jones, KW Kawai, T Kirch, K Lamoreaux, SK Liu, CY Makela, M Marek, LJ Martin, JW Morris, CL Mortensen, RN Pichlmaier, A Seestrom, SJ Serebrov, A Smith, D Teasdale, W Tipton, B Vogelaar, RB Young, AR Yuan, J TI Demonstration of a solid deuterium source of ultra-cold neutrons SO PHYSICS LETTERS B LA English DT Article ID INELASTICALLY SCATTERED NEUTRONS; ELECTRIC-DIPOLE MOMENT; STORAGE; LIFETIME; RATES AB Ultra-cold neutrons (UCN), neutrons with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role in measurements of fundamental properties of the neutron. The ability to manipulate UCN with material guides and bottles, magnetic fields, and gravity can lead to experiments with lower systematic errors than have been obtained in experiments with cold neutron beams. The UCN densities provided by existing reactor sources limit these experiments. The promise of much higher densities from solid deuterium sources has led to proposed facilities coupled to both reactor and spallation neutron sources. In this Letter we report on the performance of a prototype spallation neutron-driven solid deuterium source. This source produced bottled UCN densities of 145 +/- 7 UCN/cm(3), about three times greater than the largest bottled UCN densities previously reported. These results indicate that a production UCN source with substantially higher densities should be possible. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. Kyoto Univ, Inst Res Reactor, Kumatori, Osaka 5900494, Japan. N Carolina State Univ, Raleigh, NC 27695 USA. Princeton Univ, Princeton, NJ 08544 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Russian Acad Sci, Inst Nucl Phys, Gatchina 188350, Russia. RP Saunders, A (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM asaunders@lanl.gov; cmorris@pcprad9.lanl.gov RI Yuan, Junhua/C-7923-2009; Kirch, Klaus/A-4601-2010; Anaya, Juan-Manuel/J-1960-2016; Serebrov, Anatoly/A-6771-2014 OI Anaya, Juan-Manuel/0000-0002-6444-1249; Serebrov, Anatoly/0000-0002-6734-038X NR 22 TC 68 Z9 69 U1 1 U2 8 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 JUL 22 PY 2004 VL 593 BP 55 EP 60 DI 10.1016/j.physletb.2004.04.048 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 839MG UT WOS:000222788600008 ER PT J AU Tuchin, K AF Tuchin, K TI Heavy quark production by a quasi-classical color field in proton-nucleus collisions SO PHYSICS LETTERS B LA English DT Article ID GLUON DISTRIBUTION-FUNCTIONS; HIGH-DENSITY QCD; SMALL-X; GLASS CONDENSATE; RENORMALIZATION-GROUP; SATURATION MOMENTUM; EVOLUTION EQUATION; SEMIHARD PROCESSES; PARTON SATURATION; ENERGY-DEPENDENCE AB We calculate the inclusive heavy quark production cross section for proton-nucleus collisions at high energies. We perform calculation in a quasi-classical approximation (McLerran-Venugopalan model) neglecting all low-x evolution effects. The derived expression for the differential cross section can be applied for studying the heavy quark production in the central rapidity region at RHIC. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Tuchin, K (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM tuchin@quark.phy.bnl.gov NR 81 TC 51 Z9 51 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 22 PY 2004 VL 593 BP 66 EP 74 DI 10.1016/j.physletb.2004.04.057 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 839MG UT WOS:000222788600010 ER PT J AU Bedaque, PE AF Bedaque, PE TI Aharonov-Bohm effect and nucleon-nucleon phase shifts on the lattice SO PHYSICS LETTERS B LA English DT Article ID EFFECTIVE-FIELD THEORY; SCATTERING LENGTHS; QCD; DEPENDENCE; SYSTEMS; STATES AB We propose a method for the lattice QCD computation of nucleon-nucleon low-energy interactions. It consists in simulating QCD in the background of a "electromagnetic" field whose potential is non-vanishing, but whose field strength is zero. By tuning the background field, phase-shifts at any (but small) momenta can be determined by measuring the shift of the ground state energy. Lattice sizes as small as 5 Fermi can be sufficient for the calculation of phase shifts up to momenta of order of m(pi)/2. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Bedaque, PE (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM pfbedaque@lbl.gov NR 21 TC 97 Z9 97 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 22 PY 2004 VL 593 BP 82 EP 88 DI 10.1016/j.physletb.2004.04.045 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 839MG UT WOS:000222788600012 ER PT J AU Cherry, BR Alam, TM AF Cherry, BR Alam, TM TI Relaxation nuclear magnetic resonance imaging (R-NMRI) of PDMS/PDPS siloxane copolymer desiccation SO POLYMER LA English DT Article DE siloxanes; imaging; desiccation ID RADIOFREQUENCY FIELD GRADIENTS; PDMS COMPOSITE-MATERIALS; FOURIER ZEUGMATOGRAPHY; INTERFACIAL STRUCTURE; MOLECULAR-DYNAMICS; WATER SPECIATION; ROTATING-FRAME; SILICA; RUBBER; POLYMERS AB Relaxation nuclear magnetic resonance imaging (R-NMRI) was employed to study the effects of desiccation on SiO2-filled and unfilled polydimethylsiloxane-polydiphenylsiloxane (PDMS/PDPS) copolymers. Uniform NMR spin-spin relaxation time (T-2) profiles were observed across the sample thickness indicating that the drying process is approximately uniform, and that the desiccation of the silicone copolymer is not a H2O diffusion limited process. In a P2O5 desiccation environment, significant reduction of T-2 was observed for the SiO2-filled and unfilled copolymer material for desiccation up to 225 days. A very small reduction in T-2 was observed for the unfilled copolymer between 225 and 487 days. The increase in relative stiffness with desiccation was found to be higher for the unfilled copolymer. (C) 2004 Elsevier Ltd. All rights reserved. C1 Sandia Natl Labs, Dept Organ Mat, Albuquerque, NM 87185 USA. RP Alam, TM (reprint author), Sandia Natl Labs, Dept Organ Mat, MS 0888, Albuquerque, NM 87185 USA. EM tmalam@sandia.gov NR 45 TC 7 Z9 7 U1 3 U2 10 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0032-3861 J9 POLYMER JI Polymer PD JUL 22 PY 2004 VL 45 IS 16 BP 5611 EP 5618 DI 10.1016/j.polymer.2004.05.065 PG 8 WC Polymer Science SC Polymer Science GA 841KC UT WOS:000222927700027 ER PT J AU Zhao, ZB Rek, ZU Yalisove, SM Bilello, JC AF Zhao, ZB Rek, ZU Yalisove, SM Bilello, JC TI Phase formation and structure of magnetron sputtered chromium nitride films: in-situ and ex-situ studies SO SURFACE & COATINGS TECHNOLOGY LA English DT Article DE thin films; reactive sputtering; chromium nitride; X-ray diffraction ID PHYSICAL VAPOR-DEPOSITION; TITANIUM NITRIDE; WEAR-RESISTANCE; PVD TECHNIQUES; STRESS STATE; CRN COATINGS; HARD CHROME; TIN; MICROSTRUCTURE; TEMPERATURE AB The effects of deposition conditions on phase formation, crystallographic characteristics, residual stress, and morphology of chromium nitride films have been studied. The films were prepared via reactive magnetron sputtering with a confocal deposition geometry. The geometry is compatible with an X-ray diffraction system, which allows the growing films to be studied in-situ and in a quasi-real time fashion. The use of the unique film growth/characterization system indicates that in-situ X-ray diffraction can be a useful tool for in-situ monitoring film depositions at various growth stages. In addition to in-situ diffraction studies, the grazing incidence X-ray scattering (GIXS) with synchrotron radiation, pole figures, double crystal diffraction topography (DCDT) and scanning electron microscope were also used to characterize the post-deposited films. The effect of nitrogen flow on phase formation can be described based on three ranges of nitrogen flows. With low nitrogen flows, the films consist of primarily BCC Cr phase or hexagonal beta-Cr2N. Growth at moderate nitrogen flows leads to the films of N-deficient cubic CrN1-x With high nitrogen flow, the deposition results in films of nearly stoichiometric CrN with the (I 11) type texture. In particular, the processing window for Cr2N appears to be very small, in comparison with CrN, which can be readily obtained at high nitrogen flows. Thus the films of single Cr2N phase with well-defined structure can only be obtained under strictly controlled conditions. (C) 2004 Elsevier B.V. All rights reserved. C1 Delphi Res Labs, Shelby Twp, MI 48315 USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA. RP Zhao, ZB (reprint author), Delphi Res Labs, 51786 Shelby Pkwy, Shelby Twp, MI 48315 USA. EM zhibo.zhao@delphi.com NR 31 TC 28 Z9 28 U1 1 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD JUL 22 PY 2004 VL 185 IS 2-3 BP 329 EP 339 DI 10.1016/j.surfcoat.2003.12.026 PG 11 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA 836NX UT WOS:000222563700028 ER PT J AU Yanai, T Tew, DP Handy, NC AF Yanai, T Tew, DP Handy, NC TI A new hybrid exchange-correlation functional using the Coulomb-attenuating method (CAM-B3LYP) SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRONIC EXCITATIONS; DENSITY FUNCTIONALS; APPROXIMATION; ENERGIES; GAUSSIAN-2 AB A new hybrid exchange-correlation functional named CAM-B3LYP is proposed. It combines the hybrid qualities of B3LYP and the long-range correction presented by Tawada et al. [J. Chem. Phys., in press]. We demonstrate that CAM-B3LYP yields atomization energies of similar quality to those from B3LYP, while also performing well for charge transfer excitations in a dipeptide model, which B3LYP underestimates enormously. The CAM-B3LYP functional comprises of 0.19 Hartree-Fock (HF) plus 0.81 Becke 1988 (1388) exchange interaction at short-range, and 0.65 HF plus 0.35 B88 at long-range. The intermediate region is smoothly described through the standard error function with parameter 0.33. (C) 2004 Elsevier B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England. RP Yanai, T (reprint author), Oak Ridge Natl Lab, POB 2008,MS6367, Oak Ridge, TN 37831 USA. EM yanait@ornl.gov RI Tew, David/E-1458-2011 OI Tew, David/0000-0002-3220-4177 NR 30 TC 3963 Z9 3975 U1 34 U2 367 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 JUL 21 PY 2004 VL 393 IS 1-3 BP 51 EP 57 DI 10.1016/j.cplett.2004.06.011 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 840VJ UT WOS:000222887700010 ER PT J AU Woods, KN Wiedemann, H AF Woods, KN Wiedemann, H TI The relationship between dynamics and structure in the far infrared absorption spectrum of liquid water SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MOLECULAR-DYNAMICS; OPTICAL-CONSTANTS; FREQUENCY; DENSITY; SPECTROSCOPY; SCATTERING; REGION; SOUND; H2O; D2O AB Using an intense source of far infrared radiation, the absorption spectrum of liquid water is measured at a temperature ranging from 269 to 323 K. In the infrared spectrum we observe modes that are related to the local structure of liquid water. Here we present a FIR measured spectrum that is sensitive to the low frequency (<100 cm(-1)) microscopic details that exist in liquid water. (C) 2004 Elsevier B.V. All rights reserved. C1 Stanford Univ, BioPhys Program, Stanford, CA 94309 USA. Stanford Univ, Dept Appl Phys, Stanford, CA 94309 USA. Stanford Univ, SSRL, Stanford, CA 94309 USA. RP Woods, KN (reprint author), Stanford Univ, BioPhys Program, Stanford, CA 94309 USA. EM kwoods@stanford.edu NR 35 TC 18 Z9 18 U1 1 U2 10 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 JUL 21 PY 2004 VL 393 IS 1-3 BP 159 EP 165 DI 10.1016/j.cplett.2004.06.013 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 840VJ UT WOS:000222887700030 ER PT J AU Gillett, NP Wehner, MF Tett, SFB Weaver, AJ AF Gillett, NP Wehner, MF Tett, SFB Weaver, AJ TI Testing the linearity of the response to combined greenhouse gas and sulfate aerosol forcing SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID 20TH-CENTURY TEMPERATURE-CHANGE; CLIMATE RESPONSE; MODEL AB Detection and attribution studies of the temperature response to anthropogenic greenhouse gases and tropospheric sulfate aerosol have relied on the assumption that the responses to each of these forcings add linearly. Using surface temperature from three ensembles of integrations of the second Hadley Centre coupled model (HadCM2) forced with observed changes in greenhouse gases alone, the direct effect of sulfate aerosol alone, and combined changes in greenhouse gases and sulfate aerosol, we test this assumption. We examine the residual, defined as the response to the combined forcings, minus the sum of the responses to the individual forcings, and compare its distribution with that of control variability. Considering both global mean changes and changes at each grid point, we find no evidence that the responses to greenhouse gases and sulfate aerosol combine nonlinearly in HadCM2. C1 Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC V8W 3P6, Canada. Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Res Div, Berkeley, CA 94720 USA. Univ Reading, Hadley Ctr Climate Predict & Res, Met Off, Reading Unit, Reading RG6 6BB, Berks, England. RP Gillett, NP (reprint author), Univ Victoria, Sch Earth & Ocean Sci, POB 3055, Victoria, BC V8W 3P6, Canada. EM gillett@uvic.ca; mfwehner@lbl.gov; simon.tett@metoffice.com; weaver@uvic.ca RI Weaver, Andrew/E-7590-2011; Tett, Simon/B-1504-2013 OI Tett, Simon/0000-0001-7526-560X NR 18 TC 34 Z9 34 U1 1 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 21 PY 2004 VL 31 IS 14 AR L14201 DI 10.1029/2004GL020111 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 841FR UT WOS:000222915400004 ER PT J AU Shadle, LJ Spenik, J Sarra, A Ontko, J AF Shadle, LJ Spenik, J Sarra, A Ontko, J TI Factorial tests on process operating conditions and bed fines on the circulating fluid bed performance SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID PARTICLE-SIZE DISTRIBUTION; MINIMUM FLUIDIZATION VELOCITY; COARSE PARTICLES; LOOP-SEAL; ENTRAINMENT; VOIDAGE; REGIMES AB A cold-flow circulating fluid bed (CFB) was operated using coke breeze with a packed-bed standpipe over a range of riser and standpipe air flows. The bed materials were selected to simulate solids flow in a CFB gasifier (carbonizer) but are generally relevant to most CFB processes. CFB tests were conducted primarily in the transport mode with sufficient gas velocity to achieve a uniform axial riser pressure profiles over most of the riser height. The independent variables tested included the riser gas velocity, aeration at the base of the standpipe, and concentration of fines (average particle size). The solids inventory and riser outlet pressure were maintained constant. Factorial tests were conducted :in randomized order and in duplicate to provide and an unbiased estimate of the error. Fines were tested as a blocked variable. The gas velocity, standpipe aeration, and relative amount of fine particles were all found to be significant factors affecting both the riser solids holdup and solids flux. The riser pressure drop and mass circulation increased at the higher level of fines contrary to some earlier reports in the literature. The riser pressure drop was fitted using the general linear model (GLM), which explained more than 98% of the variation within the data, while a GLM for the mass circulation rate explained over 90%. The uncertainty of process operating variables was characterized independently through a series of duplicated flow proving experiments. C1 US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA. REM Engn Serv PLLC, Morgantown, WV 26505 USA. RP Shadle, LJ (reprint author), US DOE, Natl Energy Technol Lab, 3610 Collins Ferry Rd, Morgantown, WV 26507 USA. EM lshadl@netl.doe.gov OI Shadle, Lawrence/0000-0002-6283-3628 NR 36 TC 3 Z9 3 U1 0 U2 2 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 JUL 21 PY 2004 VL 43 IS 15 BP 4166 EP 4173 DI 10.1021/ie030371z PG 8 WC Engineering, Chemical SC Engineering GA 838UE UT WOS:000222738000021 ER PT J AU Li, LY King, DL AF Li, LY King, DL TI Method for determining performance of sulfur oxide adsorbents for diesel emission control using online measurements of SO2 and SO3 in the effluent SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID STORAGE CATALYSTS; NO(X) STORAGE; IMPACT AB Upcoming regulations regarding diesel engine emissions require substantial reductions in particulate matter and nitrogen oxides through aftertreatment methods. Because sulfur oxides in the exhaust greatly reduce the performance of the aftertreatment system, a dedicated trap for the removal of sulfur oxides has been considered. Most adsorbents are more effective in removing SO3 than SO2; hence, oxidation catalysts have been employed to maximize the concentration of SO3 in the effluent. Although SO2 concentrations are easily measured, SO3 is less easily quantified. As a result, the only figure of merit for SOx trap performance has been total capacity, provided by post-characterization. In this paper, we describe a chromatographic method for the measurement of SO2 and SO3 adsorption in real time that provides adsorbent performance data on breakthrough capacities and sulfur slip. We also provide experimental measurements of breakthrough capacities for SO2 and SO3 adsorption for some common metal oxide adsorbents using this analytical system. C1 Pacific NW Natl Lab, Div Mat, Richland, WA 99352 USA. RP King, DL (reprint author), Pacific NW Natl Lab, Div Mat, POB 999 K2-44, Richland, WA 99352 USA. EM david.king@pnl.gov NR 11 TC 5 Z9 6 U1 2 U2 5 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 JUL 21 PY 2004 VL 43 IS 15 BP 4452 EP 4456 DI 10.1021/ie049944d PG 5 WC Engineering, Chemical SC Engineering GA 838UE UT WOS:000222738000051 ER PT J AU Price, HU Jaffe, DA Cooper, OR Doskey, PV AF Price, HU Jaffe, DA Cooper, OR Doskey, PV TI Photochemistry, ozone production, and dilution during long-range transport episodes from Eurasia to the northwest United States SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article DE long-range transport; photochemistry; Pacific ID NORTHEAST PACIFIC; TROPOSPHERIC OH; ATLANTIC OCEAN; ACE-ASIA; CHEMICAL EVOLUTION; DUST AEROSOL; TRACE-P; O-3; CO; EMISSIONS AB [1] On the basis of observations from the 1997 - 2002 Photochemical Ozone Budget of the Northeast Pacific (PHOBEA) experiments, we have identified 11 transpacific long-range transport (LRT) episodes, which contain significantly elevated levels of CO, O-3, and aerosol scattering. The LRT episodes were determined from aircraft and ground-based observations of CO, O3, aerosol scattering coefficient, and 281 whole air samples analyzed for nonmethane hydrocarbons (NMHC). The ratio of excess O3 to excess CO (DeltaO(3)/DeltaCO) for the 11 LRT episodes ranged from - 0.06 to 1.52. Lower DeltaO(3)/DeltaCO ratios (< 0.10) are characteristic of LRT episodes transported in the boundary layer or in the presence of substantial mineral dust. These events lack O3 enhancements, even though O3 precursors ( CO, NMHCs) are elevated. Ratios of Delta O-3/Delta CO of 0.2 - 0.5 are characteristic of LRT episodes of industrial and/or biomass burning where excess CO is coincident with expected excesses in O-3. High Delta O-3/Delta CO ratios (> 0.50) are found in LRT episodes transported higher in the free troposphere and are probably due to a mixing of LRT pollution plumes with ozone-rich upper tropospheric air. Using PHOBEA observations, backward trajectories, and data from other experiments in the North Pacific (TRACE-P, ACE-Asia, PEM-West B) we calculate OH concentrations using two different methods. For the LRT episodes we obtain mean OH concentrations between 1.9 x 10(5) and 1.3 x 10(6) molecules cm(-3). We also present a method using dispersion models and observations to calculate the rate of dilution, k(dil), with background air during LRT. A low k(dil) indicates less mixing with background air during transport, while a high value represents more entrainment with background air. For the April 2001 LRT episode we calculate a mean kdil of 0.010 +/- 0.004 hr(-1) and an OH radical concentration of 2 x 10(5) molecules cm(-3). On the basis of these calculations we find that the large mineral dust transport episode, which took place in April 2001, was associated with the lowest OH concentration of the 11 episodes considered, implicating a strong role for heterogeneous chemistry during LRT. C1 Univ Washington, Dept Chem, Seattle, WA 98195 USA. NOAA, Cooperat Inst Res Environm Sci, Aeron Lab, Boulder, CO 80303 USA. Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA. Univ Washington, Bothell, WA 98011 USA. RP Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA. EM hprice@u.washington.edu; djaffe@u.washington.edu; ocooper@al.noaa.gov; pvdoskey@anl.gov RI Cooper, Owen/H-4875-2013 NR 54 TC 46 Z9 46 U1 0 U2 14 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 JUL 21 PY 2004 VL 109 IS D23 AR D23S13 DI 10.1029/2003JD004400 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 841GF UT WOS:000222917000001 ER PT J AU Bauer, ED Slebarski, A Frederick, NA Yuhasz, WM Maple, MB Cao, D Bridges, F Giester, G Rogl, P AF Bauer, ED Slebarski, A Frederick, NA Yuhasz, WM Maple, MB Cao, D Bridges, F Giester, G Rogl, P TI Investigation of ferromagnetic filled skutterudite compounds EuT4Sb12 (T = Fe, Ru, Os) SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID MAGNETIC-PROPERTIES; LAFE4P12 STRUCTURE; HIGH-PRESSURE; BEHAVIOR; TEMPERATURE; CEFE4SB12; YBFE4SB12; VALENCE AB The physical properties of single crystals of filled skutterudite compounds EuT4Sb12 (T = Fe, Ru, Os) have been investigated by means of x-ray diffraction, electrical resistivity, specific heat, magnetization, and x-ray absorption spectroscopy measurements. The Eu-based materials crystallize in the LaFe4P12-type structure (space group Im (3) over bar). A small Eu deficiency is encountered for Eu0.95Fe4Sb12, while the homologous compounds, Eu1.0Ru4Sb12 and Eu1.0Os4Sb12, reveal full occupancy of the Eu site. Eu0.95Fe4Sb12 appears to exhibit either canted ferromagnetic or ferrimagnetic order at T-C = 88 K whereas EuRu4Sb12 and EuOs4Sb12 are ferromagnets with Curie temperatures of T-C = 4 and 9 K, respectively. X-ray absorption near edge spectroscopy measurements reveal a nearly divalent Eu electronic configuration for EuT4Sb12 (T = Fe, Ru, Os) with no significant change with T atom or temperature. C1 Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. Univ Calif San Diego, Inst Pure & Appl Phys Sci, La Jolla, CA 92093 USA. Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 92064 USA. Univ Vienna, Inst Mineral & Kristallog, A-1090 Vienna, Austria. Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria. RP Bauer, ED (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Yuhasz, William/C-9418-2009; Bauer, Eric/D-7212-2011 NR 31 TC 49 Z9 49 U1 1 U2 10 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 JUL 21 PY 2004 VL 16 IS 28 BP 5095 EP 5107 AR PII S0953-8984(04)76733-8 DI 10.1088/0953-8984/16/28/027 PG 13 WC Physics, Condensed Matter SC Physics GA 842PV UT WOS:000223017300031 ER PT J AU Stewart, JR Ehlers, G Wills, AS Bramwell, ST Gardner, JS AF Stewart, JR Ehlers, G Wills, AS Bramwell, ST Gardner, JS TI Phase transitions, partial disorder and multi-k structures in Gd2Ti2O7 SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ANTIFERROMAGNET; ORDER AB The geometrically frustrated antiferromagnet Gd2Ti2O7 exhibits magnetic behaviour of such complexity that it poses a challenge to both experiment and theory. Magnetic ordering commences at T-N = 1.1 K and there is a further magnetic phase transition at T' = 0.7 K. Here we use neutron diffraction to definitively establish the nature of the phase transition at T' and the magnetic structure adopted below this temperature. Between T' and T-N the structure is partly ordered, as previously reported. Below T' the remaining spins order, but only weakly. The magnetic structure in this temperature range is shown to be a 4-k structure, closely related to the 1-k structure previously suggested. The 4-k and 1-k variants of the structure are distinguished by analysis of the diffuse scattering, which we believe represents a new method of solving the 'multi-k' problem of magnetic structure determination. C1 Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA. UCL, Dept Chem, London WC1H 0AJ, England. NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Stewart, JR (reprint author), Inst Max Von Laue Paul Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France. RI Wills, Andrew/C-1622-2008; Stewart, Ross/C-4194-2008; Gardner, Jason/A-1532-2013; D20, Diffractometer/O-3123-2013; Ehlers, Georg/B-5412-2008 OI Stewart, Ross/0000-0003-0053-0178; D20, Diffractometer/0000-0002-1572-1367; Ehlers, Georg/0000-0003-3513-508X NR 18 TC 100 Z9 100 U1 4 U2 25 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 JUL 21 PY 2004 VL 16 IS 28 BP L321 EP L326 AR PII S0953-8984(04)77574-8 DI 10.1088/0953-8984/16/28/L01 PG 6 WC Physics, Condensed Matter SC Physics GA 842PV UT WOS:000223017300001 ER PT J AU Nemykin, VN Laskin, J Basu, P AF Nemykin, VN Laskin, J Basu, P TI Isolation, characterization of an intermediate in an oxygen atom-transfer reaction, and the determination of the bond dissociation energy SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SURFACE-INDUCED DISSOCIATION; RESONANCE MASS-SPECTROMETRY; COMPLEXES; IONS; MOLYBDENUM; ENERGETICS; RELEVANT; SYSTEMS C1 Duquesne Univ, Dept Chem & Biochem, Pittsburgh, PA 15282 USA. Pacific NW Natl Lab, Chem Sci Div, Richland, WA 99352 USA. RP Laskin, J (reprint author), Duquesne Univ, Dept Chem & Biochem, Pittsburgh, PA 15282 USA. EM Julia.Laskin@pnl.gov; basu@duq.edu RI Basu, Partha/G-2424-2011; Nemykin, Victor/J-3747-2013; Laskin, Julia/H-9974-2012 OI Nemykin, Victor/0000-0003-4345-0848; Laskin, Julia/0000-0002-4533-9644 NR 19 TC 40 Z9 40 U1 0 U2 7 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 JUL 21 PY 2004 VL 126 IS 28 BP 8604 EP 8605 DI 10.1021/ja049121f PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 838HS UT WOS:000222704700007 PM 15250684 ER PT J AU Gilchrist, MA Coombs, D Perelson, AS AF Gilchrist, MA Coombs, D Perelson, AS TI Optimizing within-host viral fitness: infected cell lifespan and virion production rate SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article DE HIV; viral evolution; parasite evolution; viral fitness; within-host adaptation ID HEPATITIS-C VIRUS; DYNAMICS IN-VIVO; INTERFERON-ALPHA THERAPY; TYPE-1 INFECTION; T-LYMPHOCYTES; HIV; EVOLUTION; MODEL; AIDS; PATHOGENESIS AB We explore how an infected cell's virion production rate can affect the relative fitness of a virus within a host. We perform an invasion analysis, based on an age-structured model of viral dynamics, to derive the within-host relative viral fitness. We find that for chronic infections, in the absence of trade-offs between viral life history stages, natural selection favors viral strains whose virion production rate maximizes viral burst size. We then show how various life history trade-offs such as that between virion production and immune system recognition and clearance of virally infected cells can lead to natural selection favoring production rates lower than the one that maximizes burst size. Our findings suggest that HIV replication rates should vary between cells with different life spans, as has been suggested by recent observation. Published by Elsevier Ltd. C1 Los Alamos Natl Lab, Theoret Biol & Biophys Grp, Los Alamos, NM 87545 USA. RP Perelson, AS (reprint author), Los Alamos Natl Lab, Theoret Biol & Biophys Grp, MS-K710, Los Alamos, NM 87545 USA. EM asp@t10.lanl.gov RI Gilchrist, Michael/A-8209-2008; OI Gilchrist, Michael/0000-0002-6936-0771; Coombs, Daniel/0000-0002-8038-6278 FU NCRR NIH HHS [RR06555]; NIAID NIH HHS [AI28433]; NIGMS NIH HHS [GM063882-01] NR 32 TC 58 Z9 58 U1 1 U2 10 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD JUL 21 PY 2004 VL 229 IS 2 BP 281 EP 288 DI 10.1016/j.jtbi.2004.04.015 PG 8 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA 836GT UT WOS:000222544500012 PM 15207481 ER PT J AU Court, GR Houlden, MA Bultmann, S Crabb, DG Day, DB Prok, YA Penttila, SI Keith, CD AF Court, GR Houlden, MA Bultmann, S Crabb, DG Day, DB Prok, YA Penttila, SI Keith, CD TI High precision measurement of the polarization in solid state polarized targets using NMR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE polarized target; polarization; nuclear magnetic resonance ID PROTON AB The factors are reviewed that can affect the systematic uncertainties in CW-NMR measurements of the polarization in solid state polarized targets. The main problem with large signals, typically obtained with protons, is non-linearity arising from failure of the constant RF drive current assumption. The non-linearity can be reduced by operation at lower than normal signal levels. With the much smaller size deuteron signals, a limiting factor may be the instability of the background signal generated by the resonant length cable, used in the standard system. A new system is demonstrated, using non-resonant length cables, which is expected to reduce these uncertainties to a low level. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Virginia, Dept Phys, Charlottesville, VA 22903 USA. Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Crabb, DG (reprint author), Univ Virginia, Dept Phys, Charlottesville, VA 22903 USA. EM dgc3q@virginia.edu RI Day, Donal/C-5020-2015 OI Day, Donal/0000-0001-7126-8934 NR 10 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 21 PY 2004 VL 527 IS 3 BP 253 EP 263 DI 10.1016/j.nima.2004.02.041 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 839UF UT WOS:000222809700003 ER PT J AU Muhrer, G Pitcher, EJ Russell, GJ Ino, T Ooi, M Kiyanagi, Y AF Muhrer, G Pitcher, EJ Russell, GJ Ino, T Ooi, M Kiyanagi, Y TI Comparison of the measured thermal neutron beam characteristics at the Lujan center with Monte Carlo transport calculations SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE moderators; thermal neutron spectra; MCNPX ID MODERATOR AB In an effort to characterize the moderators at the Manuel Lujan Center spallation neutron source, Los Alamos, USA, we measured the thermal spectrum and the absolute thermal flux on several of the beamlines. In a second step, we then compared these measurements to results gained from Monte Carlo transport calculations which simulated these experiments. In this paper, we will present the comparison of the measurements with these simulations. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan. Hokkaido Univ, Sapporo, Hokkaido 060, Japan. RP Muhrer, G (reprint author), Los Alamos Natl Lab, LANSCE-12,Mailstop H805, Los Alamos, NM 87545 USA. EM muhrer@lanl.gov RI Kiyanagi, Yoshiaki/D-7132-2012; Lujan Center, LANL/G-4896-2012 NR 10 TC 15 Z9 15 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 21 PY 2004 VL 527 IS 3 BP 531 EP 542 DI 10.1016/j.nima.2004.03.191 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 839UF UT WOS:000222809700023 ER PT J AU Schmid, GJ Koch, JA Lerche, RA Moran, MJ AF Schmid, GJ Koch, JA Lerche, RA Moran, MJ TI A neutron sensor based on single crystal CVD diamond SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE radiation detector; single crystal CVD diamond; fusion neutron spectroscopy; ITER; fission neutron detection; alpha particle spectroscopy ID NUCLEAR RADIATION DETECTORS; NATIONAL-IGNITION-FACILITY; DIAGNOSTICS; ITER AB We report the first neutron data for a single crystal Chemical Vapor Deposition diamond sensor. Results are presented for 2.5, 14.1, and 14.9 MeV incident neutrons. We show that the energy resolution for 14.1 MeV neutrons is at least 2.9% (as limited by the energy spread of the incident neutrons), and perhaps as good as 0.4% (as extrapolated from high resolution alpha-particle data). This result could be relevant to fusion neutron spectroscopy at machines like the International Thermonuclear Experimental Reactor. We also show that our sensor has a high neutron linear attenuation coefficient, due to the high atomic density of diamond, and this could lead to applications in fission neutron detection. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Schmid, GJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM schmid3@llnl.gov NR 21 TC 56 Z9 56 U1 2 U2 19 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 21 PY 2004 VL 527 IS 3 BP 554 EP 561 DI 10.1016/j.nima.2004.03.199 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 839UF UT WOS:000222809700025 ER PT J AU Dubowski, Y Sumner, AL Menke, EJ Gaspar, DJ Newberg, JT Hoffman, RC Penner, RM Hemminger, JC Finlayson-Pitts, BJ AF Dubowski, Y Sumner, AL Menke, EJ Gaspar, DJ Newberg, JT Hoffman, RC Penner, RM Hemminger, JC Finlayson-Pitts, BJ TI Interactions of gaseous nitric acid with surfaces of environmental interest SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article ID SEA-SALT PARTICLES; NITROGEN-DIOXIDE; HETEROGENEOUS HYDROLYSIS; PHOTOCATALYTIC ACTIVITY; PYROGENIC SILICA; ROOM-TEMPERATURE; AQUEOUS SURFACES; POROUS-GLASS; WATER-VAPOR; THIN-FILMS AB Gaseous nitric acid removal by surfaces in experimental systems and in the atmospheric boundary layer is rapid. However, neither the form of HNO3 on surfaces nor its impact on the properties of the thin surface film are known. We report here studies of surfaces that have been exposed at room temperature (295 2 K) to gaseous mixtures of water vapor with HNO3 at concentrations from 46 ppb to 4 x 10(3) ppm. The surfaces were probed using a combination of Fourier transform infrared spectrometry (FTIR), non-contact atomic force microscopy (AFM), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and X-ray photoelectron spectroscopy (XPS). Exposure of borosilicate glass, quartz, and thin Teflon films to mixtures of gaseous HNO3 and water vapor leads to the subsequent uptake of much larger amounts of water than occurs on the corresponding unexposed surfaces. Infrared spectra show evidence for the formation of nitric acid-water complexes on the surface that leads to this enhanced water uptake. On borosilicate glass, exposure to the nitric acid-water vapor mixture results in surface segregation of the trace metal oxides and their nitrates formed from reaction with HNO3. The majority of these oxides can be removed by rinsing with water; however, smaller, segregated regions of ZnO remain on the surface. The implications for heterogeneous reactions in thin films on surfaces in laboratory systems and in the atmosphere are discussed. C1 Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Finlayson-Pitts, BJ (reprint author), Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA. EM bjfinlay@uci.edu RI Penner, Reginald/D-1521-2009; Menke, Erik/D-4305-2009; Gaspar, Dan/H-6166-2011; Newberg, John/E-8961-2010 OI Penner, Reginald/0000-0003-2831-3028; NR 59 TC 22 Z9 22 U1 3 U2 12 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1463-9076 J9 PHYS CHEM CHEM PHYS JI Phys. Chem. Chem. Phys. PD JUL 21 PY 2004 VL 6 IS 14 BP 3879 EP 3888 DI 10.1039/b404127e PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 848MU UT WOS:000223472600013 ER PT J AU Wilson, JR Mathews, GJ AF Wilson, JR Mathews, GJ TI White dwarfs near black holes: A new paradigm for type I supernovae SO ASTROPHYSICAL JOURNAL LA English DT Article DE black hole physics; supernovae : general; white dwarfs ID SPACE-TELESCOPE EVIDENCE; SAGITTARIUS A-ASTERISK; GLOBULAR-CLUSTER M15; TIDAL DISRUPTION; GALACTIC NUCLEI; BINARY-SYSTEMS; INITIAL MASS; STARS; EVOLUTION; GALAXIES AB We present calculations indicating the possibility of a new class of Type I supernovae. In this new paradigm, relativistic terms enhance the self-gravity of a carbon-oxygen white dwarf as it passes or orbits near a black hole. This relativistic compression can cause the central density to exceed the threshold for pycnonuclear reactions so that a thermonuclear runaway ensues. We consider three possible environments: (1) white dwarfs orbiting a low-mass (similar to10-20 M-circle dot) black hole, (2) white dwarfs encountering a massive [similar to(1-3) x 10(3) M-circle dot] black hole in a dense globular cluster, and (3) white dwarfs passing a supermassive ( similar to10(6)-10(9) M-.) black hole in a dense galactic core. We estimate the rate at which such events could occur out to a redshift z approximate to 1. Event rates are estimated to be significantly less than the rate of normal Type Ia supernovae for all three classes. Nevertheless, such events may be frequent enough to warrant a search for this new class of supernova. We propose several observable signatures that might be used to identify this type of event and speculate that such an event might have produced the observed "mixed-morphology" Sgr A East supernova remnant in the Galactic core. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Notre Dame, Dept Phys, Ctr Astrophys, Notre Dame, IN 46556 USA. RP Wilson, JR (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 60 TC 18 Z9 18 U1 2 U2 3 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 JUL 20 PY 2004 VL 610 IS 1 BP 368 EP 377 DI 10.1086/421449 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 838FU UT WOS:000222699700035 ER PT J AU Hoogerwerf, R Brickhouse, NS Mauche, CW AF Hoogerwerf, R Brickhouse, NS Mauche, CW TI The radial velocity and mass of the white dwarf of EX Hydrae measured with Chandra SO ASTROPHYSICAL JOURNAL LA English DT Article DE novae, cataclysmic variables; stars : individual (EX Hydrae); techniques : spectroscopic; X-rays : stars ID X-RAY OBSERVATIONS; LABORATORY MEASUREMENTS; SPECTROSCOPY; EMISSION; PHOTOMETRY; PARAMETERS; ACCRETION; SPECTRUM; DENSITY; HYA AB We present the first detection of orbital motion in the cataclysmic variable EX Hydrae based on X-ray data from Chandra. The large collecting area of the telescope and the high resolution of the HETG spectrometers allow for an unprecedented velocity accuracy of similar to15 km s(-1) in the X-ray wavelength regime. We find an emission line velocity amplitude of 58.2 +/- 3.7 km s(-1) and infer a white dwarf mass of 0.49 +/- 0.13 M-., in good agreement with previous studies using optical, ultraviolet, and far-ultraviolet data. C1 Harvard Smithsonian Ctr Astrophys, Smithsonian Astrophys Observ, Cambridge, MA 02138 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Harvard Smithsonian Ctr Astrophys, Smithsonian Astrophys Observ, MS 31,60 Garden St, Cambridge, MA 02138 USA. EM rhoogerwerf@cfa.harvard.edu; nbrickhouse@cfa.harvard.edu; mauche@cygnus.llnl.gov OI Brickhouse, Nancy/0000-0002-8704-4473 NR 29 TC 24 Z9 24 U1 0 U2 1 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 JUL 20 PY 2004 VL 610 IS 1 BP 411 EP 415 DI 10.1086/421389 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 838FU UT WOS:000222699700039 ER PT J AU Mauche, CW AF Mauche, CW TI Chandra low energy transmission grating spectrum of SS Cygni in outburst SO ASTROPHYSICAL JOURNAL LA English DT Article DE accretion, accretion disks; binaries : close; novae, cataclysmic variables; stars : individual (SS Cygni); X-rays : binaries ID NOVA OY CARINAE; X-RAY-EMISSION; VARIABLE UX UMA; CATACLYSMIC VARIABLES; EXTREME-ULTRAVIOLET; WHITE-DWARF; EUVE OBSERVATIONS; HT CASSIOPEIAE; XMM-NEWTON; ECLIPSE AB We have fitted the Chandra Low Energy Transmission Grating (LETG) spectrum of SS Cygni in outburst with a single-temperature blackbody suffering the photoelectric opacity of a neutral column density and the scattering opacity of an outflowing wind. We find that this simple model is capable of reproducing the essential features of the observed spectrum with the blackbody temperature T(bl) approximate to 250 +/- 50 kK, hydrogen column density N(H) approximate to 5.0(-1.5)(+2.9) 10(19) cm(-2), fractional emitting area f approximate to 5.6(-4.5)(+60) x 10(-3), boundary layer luminosity L(bl) approximate to 5(-3)(+18) x 10(33) ergs s(-1), wind velocity v approximate to 2500 km s(-1), wind mass-loss rate M(w) approximate to 1.1 x 10(16) g s(-1), and arbitrary values of the wind ionization fractions of 20 ions of O, Ne, Mg, Si, S, and Fe. Given that in outburst the accretion disk luminosity L(disk) approximate to 1 x 10(35) ergs s(-1), L(bl)/L(disk) approximate to 0.05(-0.03), which can be explained if the white dwarf ( or an equatorial belt thereon) is rotating with an angular velocity Omega(wd) approximate to 0.7(-0.2)(+0.1) Hz, hence V(rot) sin i similar to 2300 km s(-1). C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Mauche, CW (reprint author), Lawrence Livermore Natl Lab, L-473,7000 East Ave, Livermore, CA 94550 USA. EM mauche@cygnus.llnl.gov NR 29 TC 16 Z9 16 U1 0 U2 1 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 JUL 20 PY 2004 VL 610 IS 1 BP 422 EP 426 DI 10.1086/421438 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 838FU UT WOS:000222699700041 ER PT J AU Beiersdorfer, P Bitter, M von Goeler, S Hill, KW AF Beiersdorfer, P Bitter, M von Goeler, S Hill, KW TI Laboratory measurements of the Fe XVII 2p-3s and 2p-3d transitions and comparison with solar and astrophysical observations SO ASTROPHYSICAL JOURNAL LA English DT Article DE atomic processes; galaxies : individual (NGC 4636); line : formation; stars : coronae; stars : individual (Capella, II Pegasi, Procyon, YY Geminorum); Sun : X-rays, gamma rays ID X-RAY SPECTROSCOPY; BEAM ION-TRAP; LINE-FORMATION PROCESSES; PRINCETON LARGE TORUS; HIGHLY-CHARGED IONS; XMM-NEWTON; GRATING SPECTROMETER; RELATIVE INTENSITY; ACTIVE-REGION; SPECTRUM AB The L-shell emission spectrum of Fe XVII is measured in high-temperature laboratory plasmas, and the inferred intensities of the 3s --> 2p transitions relative to those of the dominant 3d --> 2p transition are compared to solar observations, as well as to observations of Capella, Procyon, Castor C, II Pegassi, and NGC 4636 with the Chandra and XMM-Newton X-ray observatories. The results from laboratory and astrophysical plasmas are in very good agreement, indicating that the collisional line formation processes found in low-density, high-temperature laboratory plasmas are a good description of those found in astrophysical plasmas. The laboratory observations disagree, however, to varying degrees with spectral modeling calculations. A review of existing laboratory measurements suggests that the intensity of the dominant 3d --> 2p transition is overestimated by spectral modeling predications. By calibrating spectral models with laboratory data, especially by decreasing the strength of the dominant 3d --> 2p transition, spectral models can be brought into agreement with the majority of solar and astrophysical observations. Without doing so, opacity effects may be grossly overestimated. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Beiersdorfer, P (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 54 TC 33 Z9 33 U1 1 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 20 PY 2004 VL 610 IS 1 BP 616 EP 623 DI 10.1086/421512 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 838FU UT WOS:000222699700056 ER PT J AU Gonzalez, ME Kaspi, VM Lyne, AG Pivovaroff, MJ AF Gonzalez, ME Kaspi, VM Lyne, AG Pivovaroff, MJ TI An XMM-Newton observation of the high magnetic field radio pulsar psr B0154+61 SO ASTROPHYSICAL JOURNAL LA English DT Article DE pulsars : general; pulsars : individual (PSRB 0154+61); X-rays : general ID X-RAY PULSAR; NEUTRON-STARS; ATMOSPHERES AB We present the results obtained from a 31 ks XMM-Newton observation of the high magnetic field radio pulsar PSR B0154 + 61. This relatively nearby pulsar has an inferred dipole surface magnetic field strength of 2.1 x 10(13) G, among the highest in the population. This makes the pulsar a possible transition object between the 13 10 classical radio pulsars and magnetars, whose enhanced X-ray emission is believed to be powered by their large magnetic fields. However, our analysis shows that no X-ray emission is detected from the position of PSR B0154 + 61 with XMM-Newton. The upper flux limit derived from the observation implies a blackbody temperature of T(bb)(infinity) less than or similar to eV and unabsorbed 0.3 - 10.0 keV X-ray luminosity of less than or similar to 1.4 x 10(32) ergs s(-1) (assuming a distance of 2.2 kpc and column density of N(H) less than or similar to 3x 10(21) cm(-2)). This luminosity is much lower than those exhibited by all known magnetars. When corrections for the presence of a light-element atmosphere on the neutron star are made, our estimates favor the temperature predictions of rapid cooling models over those of standard cooling models. However, the uncertainties in distance, column density, and atmospheric composition prevent a definite conclusion regarding initial cooling. C1 McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada. Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Gonzalez, ME (reprint author), McGill Univ, Dept Phys, Rutherford Phys Bldg,3600 Univ St, Montreal, PQ H3A 2T8, Canada. EM gonzalez@physics.mcgill.ca RI Pivovaroff, Michael/M-7998-2014 OI Pivovaroff, Michael/0000-0001-6780-6816 NR 27 TC 17 Z9 17 U1 0 U2 1 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 JUL 20 PY 2004 VL 610 IS 1 BP L37 EP L40 DI 10.1086/423033 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 838GM UT WOS:000222701500010 ER PT J AU Gu, WW Seravalli, J Ragsdale, SW Cramer, SP AF Gu, WW Seravalli, J Ragsdale, SW Cramer, SP TI CO-Induced structural rearrangement of the c cluster in Carboxydothermus hydrogenoformans CO dehydrogenase - Evidence from NiK-edge X-ray absorption spectroscopy SO BIOCHEMISTRY LA English DT Article ID CARBON-MONOXIDE DEHYDROGENASE; IRON-SULFUR PROTEIN; RHODOSPIRILLUM-RUBRUM; CLOSTRIDIUM-THERMOACETICUM; NICKEL SITES; ACTIVE-SITE; HYDROGENASE; FE; NITROGENASE; SYNTHASE AB We have examined the C cluster in type II CO dehydrogenase (CODH) from Carboxydothermus hydrogenformans using Ni K-edge X-ray absorption near edge spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy. The enzyme was studied under three conditions: "as-isolated" and after treatment with CO or Ti-III. The shape of the Ni K-edge changes slightly between the different conditions, but no significant edge shift is seen, suggesting that the C cluster contains Ni-II in both forms. The Ni EXAFS of as-isolated CODH can be simulated with 4 Ni-S interactions at 2.20 Angstrom with a large spread in distances. A light atom (C, N, 0) is not required to fit the spectrum. After CO treatment, significant changes are observed in the EXAFS. A new feature appears at similar to2.7 Angstrom; this component is consistent with a Ni-Fe interaction. The average Ni-S distance also expands to similar to2.25 Angstrom. The changes between the two forms suggest that the active site (C cluster) undergoes structural rearrangement after CO treatment, and the observed changes help reconcile the two different crystal structures. The implications of the structural change for the enzyme activation and mechanism are discussed. C1 Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Univ Calif Davis, Dept Appl Sci, Davis, CA 95616 USA. Univ Nebraska, Dept Biochem, Lincoln, NE 68588 USA. RP Cramer, SP (reprint author), Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. EM cramer@lbl.gov FU NIGMS NIH HHS [GM-44380, GM-65440, GM39451] NR 43 TC 18 Z9 18 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD JUL 20 PY 2004 VL 43 IS 28 BP 9029 EP 9035 DI 10.1021/bi036104e PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 837VB UT WOS:000222668000015 PM 15248760 ER PT J AU Reiling, KK Yoshikuni, Y Martin, VJJ Newman, J Bohlmann, J Keasling, JD AF Reiling, KK Yoshikuni, Y Martin, VJJ Newman, J Bohlmann, J Keasling, JD TI Mono and diterpene production in Escherichia coli SO BIOTECHNOLOGY AND BIOENGINEERING LA English DT Article DE isoprenoid; diterpene; monoterpene; cyclase; casbene; carene; kaurene ID FARNESYL DIPHOSPHATE SYNTHASE; ENT-KAURENE SYNTHASE; ASPARTATE-RICH MOTIF; CASBENE SYNTHASE; ISOPRENOID BIOSYNTHESIS; CAROTENOID ACCUMULATION; STRUCTURAL FEATURES; EXPRESSION; GENE; PATHWAY AB Mono- and diterpenoids are of great industrial and medical value as specialty chemicals and pharmaceuticals. Production of these compounds in microbial hosts, such as Escherichia coli, can be limited by intracellular levels of the polyprenyl diphosphate precursors, geranyl diphosphate (GPP), and geranylgeranyl diphosphate (GGPP). To alleviate this limitation, we constructed synthetic operons that express three key enzymes for biosynthesis of these precursors: (1) DxS, 1-deoxy-D-xylulose-5-phosphate synthase; (2) IPIHp, IPP isomerase from Haematococcus pluvialis; and (3) one of two variants of IspA, FPP synthase that produces either GPP or GGPP. The reporter plasmids pAC-LYC and pACYC-IB, which encode enzymes that convert either FPP or GGPP, respectively, to the pigment lycopene, were used to demonstrate that at full induction, the operon encoding the wild-type FPP synthase and mutant GGPP synthase produced similar levels of lycopene. To synthesize di- or monoterpenes in E. coli using the GGPP and GPP encoding operons either a diterpene cyclase [casbene cyclase (Ricinus communis L) and ent-kaurene cyclase (Phaeosphaeria sp. L487)] ora monoterpene cyclase [3-carene cyclase (Picea abies)] was coexpressed with their respective precursor production operon. Analysis of culture extracts or headspace by gas chromatography-mass spectrometry confirmed the in vivo production of the diterpenes casbene, kaur-15-ene, and kaur-16-ene and the monoterpenes alpha-pinene, myrcene, sabinene, 3-carene, alpha-terpinene, limonene, beta-phellandrene, alpha-terpinene, and terpinolene. Construction and functional expression of GGPP and GPP operons provides an in vivo precursor platform host for the future engineering of di- and monoterpene cyclases and the overproduction of terpenes in bacteria. (C) 2004 Wiley Periodicals, Inc. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, UCSF UBC Joint Grad Program Bioengn, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA USA. Univ British Columbia, Biotechnol Lab, Dept Bot, Vancouver, BC V6T 1Z3, Canada. Univ British Columbia, Biotechnol Lab, Dept Forest Sci, Vancouver, BC V6T 1Z3, Canada. RP Keasling, JD (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. EM keasling@socrates.berkeley.edu RI Keasling, Jay/J-9162-2012 OI Keasling, Jay/0000-0003-4170-6088 NR 41 TC 69 Z9 71 U1 5 U2 47 PU JOHN WILEY & SONS INC PI HOBOKEN PA 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0006-3592 J9 BIOTECHNOL BIOENG JI Biotechnol. Bioeng. PD JUL 20 PY 2004 VL 87 IS 2 BP 200 EP 212 DI 10.1002/bit.20128 PG 13 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA 834ZP UT WOS:000222449700009 PM 15236249 ER PT J AU Bitterwolf, TE Newell, JD Carver, CT Addleman, RS Linehan, JC Fryxell, G AF Bitterwolf, TE Newell, JD Carver, CT Addleman, RS Linehan, JC Fryxell, G TI Rhodium catalysts bound to functionalized mesoporous silica SO INORGANICA CHIMICA ACTA LA English DT Article DE rhodium catalysis; mesoporous silica; hydroformylation ID SUPERCRITICAL CARBON-DIOXIDE; HYDROFORMYLATION; COMPLEXES; 1-HEXENE; CYCLOHEXENE; MONOLAYERS; PRESSURE AB Phosphine and amine functionalized mesoporous silica materials were metallated with Rh(CO)(2)(i-Pr2NH)Cl or Rh-2(CO)(4)Cl-2, respectively, to yield catalysts containing the Rh(PPh2R)(2)(CO)Cl or Rh(CO)(2)(NH2R)Cl, where R is a propyl chain bonded to the silica surface, reactive centers. In order to ascertain the effect of pore size on rates of hydroformylation catalysis both 35 and 45 Angstrom pore size materials were used. Using the hydroformylation of octene as a reference reaction, the phosphine based, 45 Angstrom catalysts were 1.5-1.3 times faster than the amine based, 45 Angstrom catalysts, and the 45 Angstrom materials were 2.6-2.1 times faster than the 35 Angstrom materials. The orientation of the catalyst relative to the functionalized surface, and the steric environment around the catalyst active site appear to be significant in determining rate of reaction. The ability of the surface bound phosphine catalysts to affect hydroformylation was strongly influenced by the steric constraints of the substrate. Terminal alkenes were readily hydroformylated and norbornene was slowly hydroformylated, but pinene, trans-cyclododecene, cyclohexene and cholesterol were nonreactive to the catalytic center. (C) 2004 Published by Elsevier B.V. C1 Univ Idaho, Dept Chem, Moscow, ID 83844 USA. Pacific NW Natl Lab, Richland, WA USA. RP Bitterwolf, TE (reprint author), Univ Idaho, Dept Chem, Rayburn St, Moscow, ID 83844 USA. EM bitterte@uidaho.edu NR 29 TC 10 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD JUL 20 PY 2004 VL 357 IS 10 BP 3001 EP 3006 DI 10.1016/j.ica.2004.05.038 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 843WG UT WOS:000223116900024 ER PT J AU Christon, MA Martinez, MJ Voth, TE AF Christon, MA Martinez, MJ Voth, TE TI Generalized Fourier analyses of the advection-diffusion equation - Part I: one-dimensional domains SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE advection-diffusion; phase error; dispersion; discrete diffusivity; artificial viscosity ID FINITE-ELEMENT-METHOD; STREAMLINE UPWIND SCHEME; NAVIER-STOKES EQUATIONS; BOUNDARY-CONDITIONS; DIFFERENCE-SCHEMES; WAVE-PROPAGATION; GROUP-VELOCITY; GALERKIN; FORMULATIONS; GRIDS AB This paper presents a detailed multi-methods comparison of the spatial errors associated with finite difference, finite element and finite volume semi-discretizations of the scalar advection-diffusion equation. The errors are reported in terms of non-dimensional phase and group speed, discrete diffusivity, artificial diffusivity, and grid-induced anisotropy. It is demonstrated that Fourier analysis provides an automatic process for separating the discrete advective operator into its symmetric and skew-symmetric components and characterizing the spectral behaviour of each operator. For each of the numerical methods considered, asymptotic truncation error and resolution estimates are presented for the limiting cases of pure advection and pure diffusion. It is demonstrated that streamline upwind Petrov-Galerkin and its control-volume finite element analogue, the streamline upwind control-volume method, produce both an artificial diffusivity and a concomitant phase speed adjustment in addition to the usual semi-discrete artifacts observed in the phase speed, group speed and diffusivity. The Galerkin finite element method and its streamline upwind derivatives are shown to exhibit super-convergent behaviour in terms of phase and group speed when a consistent mass matrix is used in the formulation. In contrast, the CVFEM method and its streamline upwind derivatives yield strictly second-order behaviour. In Part 11 of this paper, we consider two-dimensional semi-discretizations of the advection-diffusion equation and also assess the affects of grid-induced anisotropy observed in the non-dimensional phase speed, and the discrete and artificial diffusivities. Although this work can only be considered a first step in a comprehensive multi-methods analysis and comparison, it serves to identify some of the relative strengths and weaknesses of multiple numerical methods in a common analysis framework. Published in 2004 by John Wiley Sons, Ltd. C1 Sandia Natl Labs, Computat Phys R&D Dept, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, Computat Phys R&D Dept, POB 5800,M-S 0819, Albuquerque, NM 87185 USA. EM tevoth@sandia.gov NR 40 TC 16 Z9 16 U1 0 U2 4 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0271-2091 EI 1097-0363 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD JUL 20 PY 2004 VL 45 IS 8 BP 839 EP 887 DI 10.1002/fld.719 PG 49 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA 833XG UT WOS:000222374000003 ER PT J AU Voth, TE Martinez, MJ Christon, MA AF Voth, TE Martinez, MJ Christon, MA TI Generalized Fourier analyses of the advection-diffusion equation - Part II: two-dimensional domains SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE advection-diffusion; phase error; dispersion; discrete diffusivity; artificial viscosity AB Part I of this work presents a detailed multi-methods comparison of the spatial errors associated with the one-dimensional finite difference, finite element and finite volume semi-discretizations of the scalar advection-diffusion equation. In Part 11 we extend the analysis to two-dimensional domains and also consider the effects of wave propagation direction and grid aspect ratio on the phase speed, and the discrete and artificial diffusivities. The observed dependence of dispersive and diffusive behaviour on propagation direction makes comparison of methods more difficult relative to the one-dimensional results. For this reason, integrated (over propagation direction and wave number) error and anisotropy metrics are introduced to facilitate comparison among the various methods. With respect to these metrics, the consistent mass Galerkin and consistent mass control-volume finite element methods, and their streamline upwind derivatives, exhibit comparable accuracy, and generally out-perform their lumped mass counterparts and finite-difference based schemes. While this work can only be considered a first step in a comprehensive multi-methods analysis and comparison, it serves to identify some of the relative strengths and weaknesses of multiple numerical methods in a common mathematical framework. Published in 2004 by John Wiley Sons, Ltd. C1 Sandia Natl Labs, Computat Phys R&D Dept, Albuquerque, NM 87185 USA. RP Voth, TE (reprint author), Sandia Natl Labs, Computat Phys R&D Dept, POB 5800,M-D 0819, Albuquerque, NM 87185 USA. EM tevoth@sandia.gov NR 5 TC 11 Z9 11 U1 0 U2 3 PU JOHN WILEY & SONS LTD PI CHICHESTER PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD JUL 20 PY 2004 VL 45 IS 8 BP 889 EP 920 DI 10.1002/fld.720 PG 32 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA 833XG UT WOS:000222374000004 ER PT J AU Shashkov, M Wendroff, B AF Shashkov, M Wendroff, B TI The repair paradigm and application to conservation laws SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article DE mass redistribution; repair; remapping; advection ID GRIDS AB Repair is a conservative, post-processing procedure to be used in numerical methods for hyperbolic conservation laws in order to preserve certain qualitative characteristics of the numerical solution, such as positivity of density and internal energy, by means of redistribution of conserved quantities such as mass, momentum and total energy among the cells of the mesh. In this paper we describe the repair paradigm and prove several theorems which form a theoretical foundation for the repair procedures. We consider two applications of repair and present corresponding numerical results. The first application deals with improving properties of the remapping (conservative interpolation) stage of arbitrary Lagrangian-Eulerian (ALE) methods for the gas dynamics equations, in which the solution is conservatively transferred from one mesh to another. One requirement for remapping is that the interpolated density and internal energy on the new mesh have to stay positive. Another desirable property is that the remapping procedure should not create new extrema for the velocity field. For various reasons these properties may not be satisfied, especially for high-order methods. Repair plays a supplemental role by bringing gas dynamics quantities into physically justified bounds. Another application of repair is to improve the quality of numerical methods for advection of some scalar tracer field with prescribed divergence-free velocity field, in which case the advection equation can be written as a conservation law, and therefore the total amount of tracer is conserved. We show how the repair procedure allows us to reduce oscillations in a numerical solution obtained by a formally high-order method. Repair offers an alternative to more classical methods of reducing oscillations and maintaining positivity. (C) 2004 Elsevier Inc. All rights reserved. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Shashkov, M (reprint author), Los Alamos Natl Lab, Div Theoret, T-7,MS-B284, Los Alamos, NM 87545 USA. EM shashkov@lanl.gov; bbw@lanl.gov NR 6 TC 37 Z9 38 U1 0 U2 1 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 JUL 20 PY 2004 VL 198 IS 1 BP 265 EP 277 DI 10.1016/j.jcp.2004.01.014 PG 13 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 839US UT WOS:000222811000012 ER PT J AU Qiang, J Furman, MA Ryne, RD AF Qiang, J Furman, MA Ryne, RD TI A parallel particle-in-cell model for beam-beam interaction in high energy ring colliders SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID SIMULATION AB In this paper we present a self-consistent simulation model of colliding beams in high energy ring colliders. The model, which is based on a particle-in-cell method, uses a new developed shifted effective Green function algorithm for the efficient calculation of the beam-beam interaction with arbitrary separation and large aspect ratio. The model uses transfer maps to treat the external focusing elements and a stochastic map to treat radiation damping and quantum excitation of the beams. In the parallel implementation we studied various strategies to deal with the particular nature of the colliding beam system - a system in which there can be significant particle movement between beam-beam collisions. We chose a particle-field decomposition approach instead of the conventional domain decomposition or particle decomposition approach. The particle-field approach leads to good load balance, reduced communication cost, and shows the best scalability on an IBM SP3 among the three parallel implementations we studied. A performance test of the beam-beam model on a Cray T3E, IBM SP3, and a PC cluster is presented. As an application, we studied the flip-flop instability in an electron-positron collider. (C) 2004 Elsevier Inc. All rights reserved. C1 Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Qiang, J (reprint author), Lawrence Berkeley Lab, Div Accelerator & Fus Res, Ms 71 J-100,1 Cyclotron Rd, Berkeley, CA 94720 USA. EM jqiang@lbl.gov NR 19 TC 31 Z9 33 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 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUL 20 PY 2004 VL 198 IS 1 BP 278 EP 294 DI 10.1016/j.jcp.2004.01.008 PG 17 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 839US UT WOS:000222811000013 ER PT J AU Li, ST Petzold, L AF Li, ST Petzold, L TI Adjoint sensitivity analysis for time-dependent partial differential equations with adaptive mesh refinement SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article DE adjoint method; sensitivity analysis; partial differential equations; adjoint PDE; discrete approach; continuous approach; adaptive mesh method ID CODE AB A new adjoint sensitivity analysis approach is presented for time-dependent partial differential equations with adaptive mesh refinement. The new approach, called ADDA, combines the best features of both the adjoint of the discretization (AD) and discretization of the adjoint (DA) approaches. It removes the obstacles of applying AD to adaptive methods and, in contrast to DA, requires for its use only a minimal amount of knowledge about the formulation of adjoint PDEs and their boundary conditions. The effectiveness and efficiency of ADDA are demonstrated for several numerical examples. (C) 2004 Elsevier Inc. All rights reserved. C1 Univ Calif Santa Barbara, Dept Comp Sci, Santa Barbara, CA 93106 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87544 USA. RP Petzold, L (reprint author), Univ Calif Santa Barbara, Dept Comp Sci, Santa Barbara, CA 93106 USA. EM petzold@engineering.ucsb.edu NR 23 TC 22 Z9 22 U1 1 U2 5 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 JUL 20 PY 2004 VL 198 IS 1 BP 310 EP 325 DI 10.1016/j.jcp.2003.01.001 PG 16 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 839US UT WOS:000222811000015 ER PT J AU Xie, SC Zhang, MH Boyle, JS Cederwall, RT Potter, GL Lin, WY AF Xie, SC Zhang, MH Boyle, JS Cederwall, RT Potter, GL Lin, WY TI Impact of a revised convective triggering mechanism on Community Atmosphere Model, Version 2, simulations: Results from short-range weather forecasts SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article DE convective trigger; convection; CAM2 ID CUMULUS CONVECTION; GLOBAL PRECIPITATION; OBJECTIVE ANALYSIS; ECMWF MODEL; CLIMATE; PARAMETERIZATION; SENSITIVITY; ENVIRONMENT; RESOLUTION; CLOUDS AB This study implements a revised convective triggering condition in the National Center for Atmospheric Research (NCAR) Community Atmosphere Model, Version 2 (CAM2), model to reduce its excessive warm season daytime precipitation over land. The new triggering mechanism introduces a simple dynamic constraint on the initiation of convection that emulates the collective effects of lower level moistening and upward motion of the large-scale circulation. It requires a positive contribution from the large-scale advection of temperature and moisture to the existing positive convective available potential energy (CAPE) for model convection to start. In contrast, the original convection triggering function in CAM2 assumes that convection is triggered whenever there is positive CAPE, which results in too frequent warm season convection over land arising from strong diurnal variation of solar radiation. We examine the impact of the new trigger on CAM2 simulations by running the climate model in numerical weather prediction (NWP) mode so that more available observations and high-frequency NWP analysis data can be used to evaluate model performance. We show that the modified triggering mechanism has led to considerable improvements in the simulation of precipitation, temperature, moisture, clouds, radiations, surface temperature, and surface sensible and latent heat fluxes when compared to the data collected from the Atmospheric Radiation Measurement (ARM) Program at its Southern Great Plains (SGP) site. Similar improvements are also seen over other parts of the globe. In particular, the surface precipitation simulation has been significantly improved over both the continental United States and around the globe; the overestimation of high clouds in the equatorial tropics has been substantially reduced; and the temperature, moisture, and zonal wind are more realistically simulated. Results from this study also show that some systematic errors in the CAM2 climate simulations can be detected in the early stage of model integration. Examples are the extremely overestimated high clouds in the tropics in the vicinity of Intertropical Convergence Zone and the spurious precipitation maximum to the east of the Rockies. This has important implications in studies of these model errors since running the climate model in NWP mode allows us to perform a more in-depth analysis during a short time period where more observations are available and different model errors from various processes have not compensated for the systematic errors. C1 Lawrence Livermore Natl Lab, Div Atmospher Sci, Livermore, CA 94550 USA. SUNY Stony Brook, Marine Sci Res Ctr, Stony Brook, NY 11794 USA. RP Lawrence Livermore Natl Lab, Div Atmospher Sci, L-103, Livermore, CA 94550 USA. EM xie2@llnl.gov; mzhang@atmsci.msrc.sunysb.edu; boyle@pcmdi.llnl.gov; rcederwall@llnl.gov; gpotter@llnl.gov; wuyin.lin@msrc.sunysb.edu RI Xie, Shaocheng/D-2207-2013 OI Xie, Shaocheng/0000-0001-8931-5145 NR 36 TC 32 Z9 32 U1 2 U2 3 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 JUL 20 PY 2004 VL 109 IS D14 AR D14102 DI 10.1029/2004JD004692 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 841FZ UT WOS:000222916300003 ER PT J AU Pathak, S Singh, AK McElhanon, JR Dentinger, PM AF Pathak, S Singh, AK McElhanon, JR Dentinger, PM TI Dendrimer-activated surfaces for high density and high activity protein chip applications SO LANGMUIR LA English DT Article ID IN-VITRO; POLY(PROPYLENEIMINE) DENDRIMERS; COLLOID MONOLAYERS; OXIDE SURFACES; GOLD; IMMOBILIZATION; MICROARRAYS; CONSTRUCTION; DEPOSITION; SUPPORTS AB Highly functional Si and glass surfaces for protein immobilization have been prepared by a facile activation of native surface silanol groups. Poly(propyleneimine) dendrimers of generations 1-5 were immobilized onto the surface using a facile room-temperature coupling procedure that involved activation of native silanol groups of glass using 1,1'-carbonyldiimidazole under anhydrous conditions. The dendrimer-coated surfaces were used to immobilize proteins and were characterized with respect to surface loading and activity. A number of different chemical, physical, and biochemical techniques including contact angle measurement, ellipsometry, and fluorescence microscopy were used to characterize the resulting surfaces. Increasing the dendrimer generation past G-3 led to increased surface amine content, immobilized protein concentration, and the activity of immobilized alkaline phosphatase (used as a test system). Very high activity of the immobilized proteins in the case of higher generation (G-4 and G-5) dendrimers led us to conclude that such an approach has true potential for creating highly functional surfaces for protein chip applications. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Pathak, S (reprint author), Sandia Natl Labs, MS 9403,7011 East Ave, Livermore, CA 94550 USA. EM spathak@sandia.gov NR 40 TC 69 Z9 71 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL 20 PY 2004 VL 20 IS 15 BP 6075 EP 6079 DI 10.1021/la036271f PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 837VS UT WOS:000222669800001 PM 15248684 ER PT J AU Hacker, CA Batteas, JD Garno, JC Marquez, M Richter, CA Richter, LJ van Zee, RD Zangmeister, CD AF Hacker, CA Batteas, JD Garno, JC Marquez, M Richter, CA Richter, LJ van Zee, RD Zangmeister, CD TI Structural and chemical characterization of monofluoro-substituted oligo(phenylene-ethynylene) thiolate self-assembled monolayers on gold SO LANGMUIR LA English DT Article ID NEGATIVE DIFFERENTIAL RESISTANCE; PHENYLENE ETHYNYLENE OLIGOMERS; SCANNING-TUNNELING-MICROSCOPY; RIGID BIPHENYL THIOLS; X-RAY; PHOTOELECTRON-SPECTRA; MASS-SPECTROMETRY; MOLECULAR WIRES; SILVER SURFACES; AU(111) AB Monolayers of oligo(phenylene-ethynylene) (OPE) molecules have exhibited promise in molecular electronic test structures. This paper discusses films formed from a novel molecule within this class, 2-fluoro-4-phenylethynyl-1-[(4-acetylthio)phenylethynyl]benzene (F-OPE). The conditions of self-assembled monolayer (SAM) formation were systematically altered to fabricate reproducible high-quality molecular monolayers from the acetate-protected F-OPE molecule. Detailed characterization of the F-OPE monolayers was performed by using an array of surface probes, including reflection absorbance infrared spectroscopy (RAIRS), contact angle (CA) measurements, spectroscopic ellipsometry (SE), X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and atomic force microscopy (AFM). XPS and RAIRS established that the SAM formed without removal of the F substituent and without oxidation of the thiol. The monolayer thickness, determined from SE and AFM based nanolithography, was consistent with the formation of a densely packed monolayer. The valence electronic structure of the SAM was consistent with an aromatic structure shifted by the electron-withdrawing fluorine substituent and intermolecular coupling within an oriented array of molecules. C1 Natl Inst Stand & Technol, Elect & Elect Engn Lab, Div Semicond Elect, Gaithersburg, MD 20899 USA. Natl Inst Stand & Technol, Surface & Microanal Sci Div, Chem Sci & Technol Lab, Gaithersburg, MD 20899 USA. Natl Inst Stand & Technol, Phys & Chem Properties Div, Chem Sci & Technol Lab, Gaithersburg, MD 20899 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Natl Inst Stand & Technol, Chem Sci & Technol Lab, Proc Measurements Div, Gaithersburg, MD 20899 USA. RP Hacker, CA (reprint author), Natl Inst Stand & Technol, Elect & Elect Engn Lab, Div Semicond Elect, 100 Bur Dr, Gaithersburg, MD 20899 USA. EM christina.hacker@nist.gov RI Batteas, James/D-4144-2015; Richter, Lee/N-7730-2016 OI Batteas, James/0000-0002-6244-5000; Richter, Lee/0000-0002-9433-3724 NR 67 TC 31 Z9 31 U1 2 U2 24 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL 20 PY 2004 VL 20 IS 15 BP 6195 EP 6205 DI 10.1021/la036445t PG 11 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 837VS UT WOS:000222669800020 PM 15248703 ER PT J AU Anthamatten, M Letts, SA Cook, RC AF Anthamatten, M Letts, SA Cook, RC TI Controlling surface roughness in vapor-deposited poly(amic acid) films by solvent-vapor exposure SO LANGMUIR LA English DT Article ID POLYMER THIN-FILMS; CASE-II DIFFUSION; POLYIMIDE ABLATORS; MOLECULAR-WEIGHT; IGNITION; SHELLS; NIF; FABRICATION; TEMPERATURE; VISCOSITY AB A series of vapor-deposited poly(amic acid) (PAA) films were exposed to dimethyl sulfoxide (DMSO) vapors to investigate sorption kinetics and surface smoothing phenomena. Gravimetric sorption and secondary-ion mass spectrometry (SIMS) results are both consistent with frontal (case II) diffusion. These experiments suggest that the solvent front is defined by a sharp interface that delineates the swollen material from the unswollen material. Solvent-vapor smoothing was studied by first depositing PAA onto rough aluminum surfaces, and then, during solvent-vapor exposure, the surface topology was continuously monitored using a light interference microscope. The resulting time-dependent power spectra indicate that high-frequency defects smooth faster than low-frequency defects. This frequency dependence was further investigated by depositing PAA onto a series of sinusoidal surfaces and exposing them to solvent vapor inside a flow channel. The sinusoidal amplitudes decay exponentially with time, with decay constants that are proportional to the surface frequency. To explain the physics of surface smoothing, a two-parameter model is presented and agrees qualitatively with experimental data. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Anthamatten, M (reprint author), Univ Rochester, Dept Chem Engn, 206 Gavett Hall, Rochester, NY 14627 USA. EM anthamatten@che.rochester.edu NR 35 TC 11 Z9 11 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL 20 PY 2004 VL 20 IS 15 BP 6288 EP 6296 DI 10.1021/la0497797 PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 837VS UT WOS:000222669800031 PM 15248714 ER PT J AU Helfenbein, KG Fourcade, HM Vanjani, RG Boore, JL AF Helfenbein, KG Fourcade, HM Vanjani, RG Boore, JL TI The mitochondrial genome of Paraspadella gotoi is highly reduced and reveals that chaetognaths are a sister group to protostomes SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE metazoan phylogeny; mitochondria; evolution; gene loss; genome evolution ID TRANSFER-RNA GENES; SEQUENCE-ANALYSIS; ATP SYNTHASE; YEAST; DNA; ELECTROPHORESIS; ORGANIZATION; MORPHOLOGY; NEMATODES; CNIDARIA AB We report the complete mtDNA sequence from a member of the phylum Chaetognatha (arrow worms). The Paraspadella gotoi mtDNA is highly unusual, missing 23 of the genes commonly found in animal mtDNAs, including atp6, which has otherwise been found universally to be present. Its 14 genes are unusually arranged into two groups, one on each strand. One group is punctuated by numerous noncoding intergenic nucleotides although the other group is tightly packed, having no noncoding nucleotides, leading to speculation that there are two transcription units with differing modes of expression. The phylogenetic position of the Chaetognatha within the Metazoa has long been uncertain, with conflicting or equivocal results from various morphological analyses and rRNA sequence comparisons. Comparisons here of amino acid sequences from mitochondrially encoded proteins give a single most parsimonious tree that supports a position of Chaetognatha as sister to the protostomes studied here. From this analysis, one can more clearly interpret the patterns of evolution of various developmental features, especially regarding the embryological fate of the blastopore. C1 Joint Genome Inst, Dept Energy, Walnut Creek, CA 94598 USA. Univ Michigan, Dept Biol, Ann Arbor, MI 48109 USA. Lawrence Berkeley Natl Lab, Walnut Creek, CA 94598 USA. Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA. RP Boore, JL (reprint author), Joint Genome Inst, Dept Energy, Walnut Creek, CA 94598 USA. EM jlboore@lbl.gov NR 37 TC 87 Z9 98 U1 3 U2 4 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 JUL 20 PY 2004 VL 101 IS 29 BP 10639 EP 10643 DI 10.1073/pnas.0400941101 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 840FN UT WOS:000222842700029 PM 15249679 ER PT J AU Lyman, PF Walko, DA Marasco, DL Hutchason, HL Keeffe, ME Montano, PA Bedzyk, MJ AF Lyman, PF Walko, DA Marasco, DL Hutchason, HL Keeffe, ME Montano, PA Bedzyk, MJ TI Adsorption sites of Te on Si(001) SO SURFACE SCIENCE LA English DT Article DE X-ray standing waves; thermal desorption spectroscopy; low energy electron diffraction (LEED); surface structure; morphology; roughness; and topography; silicon; chalcogens; low index single crystal surfaces ID ENERGY-ELECTRON DIFFRACTION; SURFACE; SI(100); TELLURIUM; INTERFACE; GROWTH; CDTE; TEMPERATURE; EPITAXY; SILICON AB Using multiple surface science techniques, we have investigated the structure of 0.3-1 Te monolayers adsorbed on Si(0 0 1). X-ray standing waves, low-energy electron diffraction, temperature-programmed desorption, and Auger electron spectroscopy show a relatively poorly-ordered surface. The disorder is due to two nearly degenerate Te adsorption sites, which tends to double the periodicity along one direction of the surface and reduces adatom/substrate mismatch by slightly increasing the separation of adjacent Te atoms. High-temperature anneals around 575 degreesC increase the degree of local and long-range order, while leaving the average local structure unchanged. Our findings are consistent with recent ab initio molecular dynamics simulations but not with experimental studies wherein surfaces were prepared by desorption of CdTe films. (C) 2004 Elsevier B.V. All rights reserved. C1 Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA. Argonne Natl Lab, Adv Photon Source, CAT, MHATT, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Illinois, Dept Phys, Chicago, IL 60607 USA. RP Bedzyk, MJ (reprint author), Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. EM plyman@uwm.edu; zyk@northwestern.edu RI Bedzyk, Michael/B-7503-2009; Bedzyk, Michael/K-6903-2013 NR 30 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 20 PY 2004 VL 561 IS 2-3 BP 248 EP 260 DI 10.1016/j.susc.2004.05.071 PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 838FI UT WOS:000222698500016 ER PT J AU Shin, YS Li, XHS Wang, CM Coleman, JR Exarhos, GJ AF Shin, YS Li, XHS Wang, CM Coleman, JR Exarhos, GJ TI Synthesis of hierarchical titanium carbide from titania-coated cellulose paper SO ADVANCED MATERIALS LA English DT Article ID CARBOTHERMAL SYNTHESIS; MINERALIZATION; POWDERS; WOOD AB Cellulose paper and an aqueous-based, inexpensive TiO2 precursor, Tyzor-LA, have been used to prepare TiC via carbothermal reduction in an Ar flow. The hierarchical cellulose structures were completely maintained upon the agglomeration of 10-50 nm TiC nanoparticles. The lattice parameter of TiC increased with increasing reaction temperature, while the oxygen content in the sample decreased and showed minimal oxygen impurity at 1500 degreesC (0.24 wt.-%). C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Shin, YS (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd,POB 999,MS K2-44, Richland, WA 99352 USA. EM yongsoon.shin@pnl.gov NR 18 TC 67 Z9 73 U1 4 U2 48 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 JUL 19 PY 2004 VL 16 IS 14 BP 1212 EP + DI 10.1002/adma.200306661 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 846BL UT WOS:000223289600012 ER PT J AU Kakazei, GN Wigen, PE Guslienko, KY Novosad, V Slavin, AN Golub, VO Lesnik, NA Otani, Y AF Kakazei, GN Wigen, PE Guslienko, KY Novosad, V Slavin, AN Golub, VO Lesnik, NA Otani, Y TI Spin-wave spectra of perpendicularly magnetized circular submicron dot arrays SO APPLIED PHYSICS LETTERS LA English DT Article ID EXCHANGE BOUNDARY-CONDITIONS; FERROMAGNETIC-FILMS; INPLANE AB Dynamic microwave properties of arrays of circular Ni and Ni81Fe19 dots were studied by X-band ferromagnetic resonance (FMR) technique. All of the dots had the same radius 0.5 mum, thickness 50-70 nm, and were arranged into rectangular or square array with different interdot separations. In the case of perpendicular magnetization multiple (up to 8) sharp resonance peaks were observed below the main FMR peak, and the relative positions of these peaks were independent of the interdot separations. Quantitative description of the observed multiresonance FMR spectra is given using the dipole-exchange spin wave dispersion equation for a perpendicularly magnetized film where in-plane wave vector is quantized due to the finite dot radius, and the inhomogenetiy of the intradot static demagnetization field in the nonellipsoidal dot is taken into account. (C) 2004 American Institute of Physics. C1 Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Oakland Univ, Dept Phys, Rochester, MI 48309 USA. Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA. Inst Magnetism NAS Ukraine, UA-03142 Kiev, Ukraine. RIKEN, Frontier Res Syst, Saitama 3510198, Japan. RP Kakazei, GN (reprint author), Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA. EM kakazey.1@osu.edu RI Kakazei, Gleb/A-5106-2008; Golub, Vladimir/K-8647-2012; Novosad, Valentyn/C-2018-2014; OTANI, Yoshichika/I-5884-2012; Novosad, V /J-4843-2015 OI Kakazei, Gleb/0000-0001-7081-581X; Golub, Vladimir/0000-0002-7550-3978; OTANI, Yoshichika/0000-0001-8008-1493; NR 13 TC 93 Z9 93 U1 1 U2 19 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 JUL 19 PY 2004 VL 85 IS 3 BP 443 EP 445 DI 10.1063/1.1772868 PG 3 WC Physics, Applied SC Physics GA 837ZO UT WOS:000222680400032 ER PT J AU Yin, L Vlasko-Vlasov, VK Rydh, A Pearson, J Welp, U Chang, SH Gray, SK Schatz, GC Brown, DB Kimball, CW AF Yin, L Vlasko-Vlasov, VK Rydh, A Pearson, J Welp, U Chang, SH Gray, SK Schatz, GC Brown, DB Kimball, CW TI Surface plasmons at single nanoholes in Au films SO APPLIED PHYSICS LETTERS LA English DT Article ID OPTICAL MICROSCOPE; DIFFRACTION; TRANSMISSION; PROPAGATION; APERTURE; LIGHT; HOLES AB The generation of surface plasmon polaritons (SPPs) at isolated nanoholes in 100 nm thick Au films is studied using near-field scanning optical microscopy. Finite-difference time-domain calculations, some explicitly including a model of the scanning tip, are used to interpret the results. We find the holes act as point-like sources of SPPs and demonstrate that the interference between the SPP and a directly transmitted wave allows determination of the wavelength, phase, and decay length of the SPP. The near-field intensity patterns can be manipulated by varying the angle and polarization of the incident beam. (C) 2004 American Institute of Physics. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. RP Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM welp@anl.gov RI Mote, Rakesh/A-9534-2009; Chang, Gilbert/B-5437-2012; Rydh, Andreas/A-7068-2012 OI Chang, Gilbert/0000-0002-2729-4905; Rydh, Andreas/0000-0001-6641-4861 NR 19 TC 209 Z9 211 U1 8 U2 58 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 2004 VL 85 IS 3 BP 467 EP 469 DI 10.1063/1.1773362 PG 3 WC Physics, Applied SC Physics GA 837ZO UT WOS:000222680400040 ER PT J AU Ganguly, G Carlson, DE Hegedus, SS Ryan, D Gordon, RG Pang, D Reedy, RC AF Ganguly, G Carlson, DE Hegedus, SS Ryan, D Gordon, RG Pang, D Reedy, RC TI Improved fill factors in amorphous silicon solar cells on zinc oxide by insertion of a germanium layer to block impurity incorporation SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSPARENT CONDUCTING OXIDES; HYDROGEN PLASMA INTERACTIONS; CHEMICAL-VAPOR-DEPOSITION; TCO/P CONTACT; GROWTH AB Amorphous silicon based solar cells deposited on zinc oxide (ZnO) exhibit reduced fill factor and open circuit voltage in comparison with tin oxide (SnO2). One approach has been to use higher conductivity nanocrystalline layers to overcome the "higher contact resistance." Recent measurements have found the ZnO-p-layer contact resistance to be unchanged relative to SnO2, while instead, the diode ideality factor is poorer on ZnO. We show that the insertion of a thin, amorphous germanium layer at the ZnO-p-layer interface improves the cell performance and diode ideality factor by suppression of oxygen and zinc incorporation in the silicon layers. (C) 2004 American Institute of Physics. C1 BP Solar, Toano, VA 23185 USA. Univ Delaware, Inst Energy Convers, Newark, DE 19716 USA. Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ganguly, G (reprint author), United Solar Ovon, Troy, MI 48084 USA. EM gganguly@uni-solar.com NR 18 TC 22 Z9 22 U1 0 U2 18 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 2004 VL 85 IS 3 BP 479 EP 481 DI 10.1063/1.1773372 PG 3 WC Physics, Applied SC Physics GA 837ZO UT WOS:000222680400044 ER PT J AU Graetz, J Reilly, JJ Johnson, J Ignatov, AY Tyson, TA AF Graetz, J Reilly, JJ Johnson, J Ignatov, AY Tyson, TA TI X-ray absorption study of Ti-activated sodium aluminum hydride SO APPLIED PHYSICS LETTERS LA English DT Article ID HYDROGEN STORAGE MATERIALS; DOPED NAALH4; TITANIUM; ZIRCONIUM; DIFFRACTION; PRECURSORS; ALANATES; STATE AB Ti K-edge x-ray absorption near-edge spectroscopy was used to explore the Ti valence and coordination in Ti-activated sodium alanate. An empirical relationship was established between the Ti valence and the Ti K-edge onset based on a set of standards. This relationship was used to estimate oxidation states of the titanium catalyst in 2 and 4 mol % Ti-doped NaAlH4. The results demonstrate that the formal titanium valence is zero in doped sodium alanate and nearly invariant during hydrogen cycling. A qualitative comparison of the edge fine structure suggests that the Ti is present on the surface in the form of amorphous TiAl3. (C) 2004 American Institute of Physics. C1 Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA. RP Graetz, J (reprint author), Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. EM graetz@bnl.gov NR 15 TC 166 Z9 167 U1 5 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 JUL 19 PY 2004 VL 85 IS 3 BP 500 EP 502 DI 10.1063/1.1773614 PG 3 WC Physics, Applied SC Physics GA 837ZO UT WOS:000222680400051 ER PT J AU Abrikosova, AA AF Abrikosova, AA TI Type H superconductors and the vortex lattice SO CHEMPHYSCHEM LA English DT Review DE magnetism; Nobel lecture; phase transitions; superconductors; vortices AB Superconducting material is used, for example, in magnetic resonance imaging for medical examinations and particle accelerators in physics. Knowledge about superliquid liquids can give us deeper insights into the ways in which matter behaves in its lowest and most ordered state. Work by the author on superconduction in liquid helium established of type II superconductors and proved that vortex lattices exist in superfluid helium, in the presence of magnetic fields. He showed that the Ginzburg-Landau theory could be extended to include this "new" type of superconductors, which today are in common use. His work on phase transitions of these superconductors under the influence of magnetic fields was groundbreaking, although he has worked in many other areas since then. He was awarded the Nobel prize in 2003 "for pioneering contributions to theory of superconductors and superfluids" with V.L. Ginzburg and A.J. Leggett. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Abrikosova, AA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM abrikosov@anl.gov NR 21 TC 0 Z9 0 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 101161, 69451 WEINHEIM, GERMANY SN 1439-4235 EI 1439-7641 J9 CHEMPHYSCHEM JI ChemPhysChem PD JUL 19 PY 2004 VL 5 IS 7 BP 924 EP 929 DI 10.1002/cphc.200400138 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 840VH UT WOS:000222887500001 ER PT J AU Chiou, EW Thomason, LW Burton, SP Michelsen, HA AF Chiou, EW Thomason, LW Burton, SP Michelsen, HA TI Assessment of the SAGE II version 6.2 water vapor data set through intercomparison with ATMOS/ATLAS-3 measurements SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID STRATOSPHERIC AEROSOL AB Based on the intercomparisons with ATMOS/ATLAS-3 measurements, the SAGE II (Stratospheric Aerosol and Gas Experiment II) version 6.2 water vapor profiles exhibit significant improvements over earlier versions of data products. A previously reported SAGE II dry bias in the lower stratosphere relative to ATMOS version 3 data set has been effectively eliminated. In the new version, the agreement between SAGE II and ATMOS is generally within 15% with no systematic biases throughout the entire altitude range of 12 km to 40 km. The only exception is the situation for which 1020-nm aerosol extinctions exceed the recommended upper limit of 3 X 10(-4) km(-1). Based on the comparisons, the reported uncertainties for SAGE II water vapor mixing ratios appear to be over-estimated by a factor of 2 to 3 for the lower stratosphere. C1 SAIC Inc, Hampton, VA USA. NASA, Langley Res Ctr, Hampton, VA 23665 USA. Sandia Natl Labs, Combust Res Facil, Livermore, CA USA. RP Chiou, EW (reprint author), SAIC Inc, Hampton, VA USA. EM e.chiou@larc.nasa.gov NR 6 TC 5 Z9 5 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 17 PY 2004 VL 31 IS 14 AR L14101 DI 10.1029/2004GL020071 PG 5 WC Geosciences, Multidisciplinary SC Geology GA 839PN UT WOS:000222797100003 ER PT J AU Huang, CS Le, G Reeves, GD AF Huang, CS Le, G Reeves, GD TI Periodic magnetospheric substorms during fluctuating interplanetary magnetic field B-z SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB We study the possible role played by sudden changes in the solar wind in triggering substorm onsets. We show that periodic substorms can occur when the IMF B-Z is small and fluctuating between southward and northward. The period of the substorms during the fluctuating IMF is similar to3 hours, nearly the same as that during strongly and continuously southward IMF. We also show that large sudden changes in the solar wind do not necessarily trigger substorm onsets. For example, a northward IMF turning with a change of 31 nT in the IMF B-Z after 1.2 hours of strongly southward IMF (between -12 and -18 nT) did not cause a substorm onset. The observations show that the period of substorms is not controlled either directly by variations in the solar wind or indirectly by the energy transferred to the magnetosphere from the solar wind. We suggest that a sudden change in the solar wind can trigger a substorm onset if and only if the magnetosphere has reached a state conducive to the generation of substorms. Substorms will occur every similar to3 hours, no matter whether the IMF is continuously southward or fluctuating between southward and northward. C1 MIT, Haystack Observ, Westford, MA 01886 USA. NASA, Extraterr Phys Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Huang, CS (reprint author), MIT, Haystack Observ, Route 40, Westford, MA 01886 USA. EM cshuang@haystack.mit.edu; guan.le@nasa.gov; reeves@lanl.gov RI Le, Guan/C-9524-2012; Reeves, Geoffrey/E-8101-2011 OI Le, Guan/0000-0002-9504-5214; Reeves, Geoffrey/0000-0002-7985-8098 NR 11 TC 16 Z9 16 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 17 PY 2004 VL 31 IS 14 AR L14801 DI 10.1029/2004GL020180 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 839PN UT WOS:000222797100004 ER PT J AU de Gouw, JA Cooper, OR Warneke, C Hudson, PK Fehsenfeld, FC Holloway, JS Hubler, G Nicks, DK Nowak, JB Parrish, DD Ryerson, TB Atlas, EL Donnelly, SG Schauffler, SM Stroud, V Johnson, K Carmichael, GR Streets, DG AF de Gouw, JA Cooper, OR Warneke, C Hudson, PK Fehsenfeld, FC Holloway, JS Hubler, G Nicks, DK Nowak, JB Parrish, DD Ryerson, TB Atlas, EL Donnelly, SG Schauffler, SM Stroud, V Johnson, K Carmichael, GR Streets, DG TI Chemical composition of air masses transported from Asia to the U. S. West Coast during ITCT 2K2: Fossil fuel combustion versus biomass-burning signatures SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article DE long-range transport; fossil-fuel combustion; biomass burning ID CHLORINE EMISSIONS INVENTORY; VOLATILE ORGANIC-COMPOUNDS; SPECTROMETRY PTR-MS; NORTH-AMERICA; NONMETHANE HYDROCARBONS; INDUSTRIAL EMISSIONS; CARBON-MONOXIDE; UNITED-STATES; AMBIENT AIR; TRACE GASES AB [1] As part of the Intercontinental Transport and Chemical Transformation experiment in 2002 (ITCT 2K2), a National Oceanic and Atmospheric Administration (NOAA) WP-3D research aircraft was used to study the long-range transport of Asian air masses toward the west coast of North America. During research flights on 5 and 17 May, strong enhancements of carbon monoxide (CO) and other species were observed in air masses that had been transported from Asia. The hydrocarbon composition of the air masses indicated that the highest CO levels were related to fossil fuel use. During the flights on 5 and 17 May and other days, the levels of several biomass-burning indicators increased with altitude. This was true for acetonitrile (CH3CN), methyl chloride (CH3Cl), the ratio of acetylene (C2H2) to propane (C3H8), and, on May 5, the percentage of particles measured by the particle analysis by laser mass spectrometry (PALMS) instrument that were attributed to biomass burning based on their carbon and potassium content. An ensemble of back-trajectories, calculated from the U.S. west coast over a range of latitudes and altitudes for the entire ITCT 2K2 period, showed that air masses from Southeast Asia and China were generally observed at higher altitudes than air from Japan and Korea. Emission inventories estimate the contribution of biomass burning to the total emissions to be low for Japan and Korea, higher for China, and the highest for Southeast Asia. Combined with the origin of the air masses versus altitude, this qualitatively explains the increase with altitude, averaged over the whole ITCT 2K2 period, of the different biomass-burning indicators. C1 NOAA, Aeron Lab, Boulder, CO 80303 USA. Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA. Natl Ctr Atmospher Res, Boulder, CO 80305 USA. Univ Iowa, Ctr Global & Reg Environm Res, Iowa City, IA 52242 USA. Argonne Natl Lab, Decis & Informat Sci Div, Argonne, IL 60439 USA. RP NOAA, Aeron Lab, 325 Broadway, Boulder, CO 80303 USA. EM jdegouw@al.noaa.gov RI Warneke, Carsten/E-7174-2010; Hubler, Gerhard/E-9780-2010; Parrish, David/E-8957-2010; Nowak, John/B-1085-2008; Holloway, John/F-9911-2012; Cooper, Owen/H-4875-2013; Ryerson, Tom/C-9611-2009; Fehsenfeld, Frederick/I-4876-2013; Atlas, Elliot/J-8171-2015; de Gouw, Joost/A-9675-2008; OI Parrish, David/0000-0001-6312-2724; Nowak, John/0000-0002-5697-9807; Holloway, John/0000-0002-4585-9594; de Gouw, Joost/0000-0002-0385-1826; Streets, David/0000-0002-0223-1350 NR 51 TC 55 Z9 56 U1 4 U2 18 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 JUL 17 PY 2004 VL 109 IS D23 AR D23S20 DI 10.1029/2003JD004202 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 839PX UT WOS:000222798100001 ER PT J AU Oda, K Ogura, T Appelman, EH Yoshikawa, S AF Oda, K Ogura, T Appelman, EH Yoshikawa, S TI The intrinsic stability of the second intermediate following the dioxygen-bound form in the O-2 reduction by cytochrome c oxidase SO FEBS LETTERS LA English DT Article DE cytochrome c oxidase; oxygen activation; proton pump; P intermediate; resonance Raman ID RESONANCE RAMAN-SPECTROSCOPY; HYDROGEN-PEROXIDE; OXYGEN ACTIVATION; ELECTRON-TRANSFER; FERRYL; SPECTRA; RESPIRATION; DEPENDENCE; PH AB Aeration of a two-electron reduced cytochrome c oxidase provides a species with two Raman bands at 804 and 356 cm(-1), identifying it as the second intermediate following the O-2-bound species in the enzymatic O-2 reduction process. It degrades directly to the fully oxidized form with a half-life time of 70 ruin at pH 8.0. The stability suggests an effective insulation for the active site in an extremely high oxidation state (Fe4+ with one oxidative equivalent nearby) against spontaneous electron leaks, which would dissipate proton motive force. The formation and degradation of the second intermediate are pH-dependent. (C) 2004 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved. C1 Univ Tokyo, Grad Sch Arts & Sci, Dept Life Sci, Meguro Ku, Tokyo 1538902, Japan. Univ Hyogo, Grad Sch Sci, Dept Life Sci, Kamigori, Hyogo 6781297, Japan. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Ogura, T (reprint author), Univ Tokyo, Grad Sch Arts & Sci, Dept Life Sci, Meguro Ku, Tokyo 1538902, Japan. EM ogura@sci.u-hyogo.ac.jp NR 28 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD JUL 16 PY 2004 VL 570 IS 1-3 BP 161 EP 165 DI 10.1016/j.febslet.2004.06.036 PG 5 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 840UM UT WOS:000222885400030 PM 15251458 ER PT J AU Pokkuluri, PR Laible, PD Crawford, AE Mayfield, JF Yousef, MA Ginell, SL Hanson, DK Schiffer, M AF Pokkuluri, PR Laible, PD Crawford, AE Mayfield, JF Yousef, MA Ginell, SL Hanson, DK Schiffer, M TI Temperature and cryoprotectant influence secondary quinone binding position in bacterial reaction centers SO FEBS LETTERS LA English DT Article DE reaction center structure; X-ray diffraction; single wavelength anomalous dispersion; selenomethionine; quinone; cryoprotection ID PHOTOSYNTHETIC REACTION-CENTER; INDUCED STRUCTURAL-CHANGES; MUTANT REACTION CENTERS; RHODOBACTER-SPHAEROIDES; ELECTRON-TRANSFER; RHODOPSEUDOMONAS-VIRIDIS; VIBRATIONAL SPECTROSCOPY; PROTON-TRANSFER; 3A RESOLUTION; WILD-TYPE AB We have determined the first de novo position of the secondary quinone Q(B) in the Rhodobacter sphaeroides reaction center (RC) using phases derived by the single wavelength anomalous dispersion method from crystals with selenomethionine substitution. We found that in frozen RC crystals, Q(B) occupies primarily the proximal binding site. In contrast, our room temperature structure showed that Q(B) is largely in the distal position. Both data sets were collected in dark-adapted conditions. We estimate that the occupancy of the Q(B) site is 80% with a proximal: distal ratio of 4:1 in frozen RC crystals. We could not separate the effect of freezing from the effect of the cryoprotectants ethylene glycol or glycerol. These results could have far-reaching implications in structure/function studies of electron transfer in the acceptor quinone complex because the above are the most commonly used cryoprotectants in spectroscopic experiments. (C) 2004 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies. C1 Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA. RP Schiffer, M (reprint author), Argonne Natl Lab, Biosci Div, 9700 S Cass Ave, Argonne, IL 60439 USA. EM mschiffer@anl.gov FU NIGMS NIH HHS [R01 GM63849, R01 GM61887] NR 29 TC 15 Z9 17 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD JUL 16 PY 2004 VL 570 IS 1-3 BP 171 EP 174 DI 10.1016/j.febslet.2004.06.042 PG 4 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 840UM UT WOS:000222885400032 PM 15251460 ER PT J AU Ettinger, M Hoyer, P Knill, E AF Ettinger, M Hoyer, P Knill, E TI The quantum query complexity of the hidden subgroup problem is polynomial SO INFORMATION PROCESSING LETTERS LA English DT Article DE algorithms; quantum computation; hidden subgroups; query complexity ID ALGORITHMS AB We present a quantum algorithm which identifies with certainty a hidden subgroup of an arbitrary finite group G in only a polynomial (in log I G 1) number of calls to the oracle. This is exponentially better than the best classical algorithm. However our quantum algorithm requires exponential time, as in the classical case. Our algorithm utilizes a new technique for constructing error-free algorithms for non-decision problems on quantum computers. Published by Elsevier B.V. C1 Univ Calgary, Dept Comp Sci, Calgary, AB T2N 1N4, Canada. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hoyer, P (reprint author), Univ Calgary, Dept Comp Sci, Calgary, AB T2N 1N4, Canada. EM ettinger@lanl.gov; hoyer@cpsc.ucalgary.ca; knill@lanl.gov OI Hoyer, Peter/0000-0001-9877-268X NR 13 TC 36 Z9 36 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0020-0190 J9 INFORM PROCESS LETT JI Inf. Process. Lett. PD JUL 16 PY 2004 VL 91 IS 1 BP 43 EP 48 DI 10.1016/j.ipl.2004.01.024 PG 6 WC Computer Science, Information Systems SC Computer Science GA 828QH UT WOS:000221987300008 ER PT J AU Xing, Y Liu, D Zhang, RG Joachimiak, A Songyang, Z Xu, WQ AF Xing, Y Liu, D Zhang, RG Joachimiak, A Songyang, Z Xu, WQ TI Structural basis of membrane targeting by the phox homology domain of cytokine-independent survival kinase (CISK-PX) SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID X-RAY-DIFFRACTION; PROTEIN-KINASE; PHOSPHATIDYLINOSITOL 3-PHOSPHATE; MEDIATED INTERACTION; CRYSTAL-STRUCTURE; FYVE DOMAIN; SH3 DOMAINS; BINDING; ACTIVATION; P40(PHOX) AB The cytokine-independent survival kinase (CISK) in the serum and glucocorticoid-regulated kinase family plays an important role in mediating cell growth and survival. N-terminal to its catalytic kinase domain, CISK contains a phox homology (PX) domain, a phosphoinositide-binding motif that directs the membrane localization of CISK and regulates CISK activity. We have determined the crystal structures of the mouse CISK-PX domain to unravel the structural basis of membrane targeting of CISK. In addition to the specific interactions conferred by the phosphoinositide-binding pocket, the structure suggests that a hydrophobic loop region and a hydrophilic beta-turn contribute to the interactions with the membrane. Furthermore, biochemical studies reveal that CISK-PX dimerizes in the presence of the linker between the PX domain and kinase domain, suggesting a multivalent mechanism in membrane localization of CISK. C1 Univ Washington, Dept Biol Struct, Seattle, WA 98195 USA. Baylor Coll Med, Verna & Marrs McLean Dept Biochem & Mol Biol, Houston, TX 77030 USA. Argonne Natl Lab, Struct Biol Ctr, Biosci Div, Argonne, IL 60439 USA. RP Xu, WQ (reprint author), Univ Washington, Dept Biol Struct, 1959 NE Pacific St, Seattle, WA 98195 USA. EM wxu@u.washington.edu OI Xu, Wenqing/0000-0002-2884-3101 FU NCI NIH HHS [CA84208]; NIGMS NIH HHS [GM69572] NR 49 TC 39 Z9 40 U1 1 U2 2 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 JUL 16 PY 2004 VL 279 IS 29 BP 30662 EP 30669 DI 10.1074/jbc.M404107200 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 836CD UT WOS:000222531900096 PM 15126499 ER PT J AU Zhang, X Studier, FW AF Zhang, X Studier, FW TI Multiple roles of T7 RNA polymerase and T7 lysozyme during bacteriophage T7 infection SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE T7 RNA polymerase; T7 lysozyme; DNA replication; DNA packaging; transcriptional pausing and termination ID T7 RNA-POLYMERASE; SEQUENCE-SPECIFIC TERMINATION; COMPLETE NUCLEOTIDE-SEQUENCE; COMPLETE GENOMIC SEQUENCE; DNA-REPLICATION; ESCHERICHIA-COLI; DEOXYRIBONUCLEIC-ACID; PURIFIED PROTEINS; STRUCTURAL BASIS; PHAGE INFECTION AB T7 RNA polymerase selectively transcribes T7 genes during infection but is also involved in DNA replication, maturation and packaging. T7 lysozyme is an amidase that cuts a bond in the peptidoglycan layer of the cell wall, but it also binds T7 RNA polymerase and inhibits transcription, and it stimulates replication and packaging of T7 DNA. To better understand the roles of these two proteins during T7 infection, mutants of each were constructed or selected and their biochemical and physiological behavior analyzed. The amidase activity of lysozyme is needed for abrupt lysis and release of phage particles but appears to have no role in replication and packaging. The interaction between polymerase and lysozyme stimulates both replication and packaging. Polymerase mutants that gain the ability to grow normally in the absence of an interaction with lysozyme still fail to shut down late transcription and, remarkably, have become hypersensitive to inhibition when lysozyme is able to bind. These lysozyme-hypersensitive polymerases behave without lysozyme similarly to wild-type polymerase with lysozyme: both remain longer at the promoter before establishing a lysozyme-resistant elongation complex and both increase the length of pausing when elongation complexes encounter an eight-base recognition sequence involved in DNA packaging. Replication origins contain T7 promoters, but the role of T7 RNA polymerase in initiating replication is not understood well enough to more than speculate how the lysozyme-polymerase interaction stimulates replication. Maturation and packaging is apparently initiated through interaction between prohead-terminase complexes and transcription elongation complexes paused at the sequence TATCTGT(T/A), well conserved at the right-end of the concatemer junction of T7-like phages. A model that is consistent with the structure of an elongation complex and a large body of mutational and biochemical data is proposed to explain sequence-specific pausing and potential termination at the consensus recognition sequence (C/T)ATCTGT(T/A). (C) 2004 Elsevier Ltd. All rights reserved. C1 Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. RP Studier, FW (reprint author), Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. EM studier@bnl.gov FU NIGMS NIH HHS [GM21872] NR 65 TC 30 Z9 35 U1 0 U2 14 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUL 16 PY 2004 VL 340 IS 4 BP 707 EP 730 DI 10.1016/j.jmb.2004.05.006 PG 24 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 838SU UT WOS:000222734300006 PM 15223315 ER PT J AU Acousta, D Affolder, T Akimoto, T Albrow, MG Ambrose, D Amerio, S Amidei, D Anastassov, A Anikeev, K Annovi, A Antos, J Aoki, M Apollinari, G Arisawa, T Arguin, JF Artikov, A Ashmanskas, W Attal, A Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barker, GJ Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Booth, PSL Bortoletto, D Boudreau, J Bourov, S Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Byrum, KL Cabrera, S Calafiura, P Campanelli, M Campbell, M Canepa, A Casarsa, M Carlsmith, D Carron, S Carosi, R Castro, A Catastini, P Cauz, D Cerri, A Cerri, C Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Cho, I Cho, K Chokheli, D Chu, ML Chuang, S Chung, JY Chung, WH Chung, YS Ciobanu, CI Ciocci, MA Clark, AG Clark, D Coca, M Connolly, A Convery, M Conway, J Cordelli, M Cortiana, G Cranshaw, J Cuevas, J Culbertson, R Currat, C Cyr, D Dagenhart, D Da Ronco, S D'Auria, S de Barbaro, P De Cecco, S De Lentdecker, G Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Dininno, M De Pedis, D Derwent, PF Devlin, T Dionisi, C Dittmann, JR Doksus, P Dominguez, A Donati, S Donega, M D'Onnofrio, M Dorigo, T Drollinger, V Ebina, K Eddy, N Ely, R Erbacher, R Erdmann, M Errede, D Errede, S Eusebi, R Fang, HC Farrington, S Fedorko, I Feild, RG Feindt, M Fernandez, JP Ferretti, C Field, RD Fiori, I Flanagan, G Flaugher, B Flores-Castillo, LR Foland, A Forrester, S Foster, GW Franklin, M Frisch, H Fujii, Y Furic, I Gajjar, A Gallas, A Galyardt, J Gallinaro, M Garcia-Sciveres, M Garfinkel, AF Gay, C Gerberich, H Gerdes, DW Gerchtein, E Giagu, S Giannetti, P Gibson, A Gibson, K Ginsburg, C Giolo, K Giordani, M Giurgiu, G Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, D Goldstein, J Gomez, G Gomez-Ceballos, G Gondcharov, M Gonzalez, O Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Grosso-Pilcher, C Guenther, M da Costa, JG Haber, C Hahn, K Hahn, SR Halkiadakis, E Handler, R Happacher, F Hara, K Hare, M Harr, RF Harris, RM Hartmann, F Hatakeyama, K Hauser, J Hays, C Hayward, H Heider, E Heinemann, B Heinrich, J Hennecke, M Herndon, M Hill, C Hirschbuehl, D Hocker, A Hoffman, KD Holloway, A Hou, S Houlden, MA Huffman, BT Huang, Y Hughes, RE Huston, J Ikado, K Incandela, J Introzzi, G Iori, M Ishizawa, Y Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jang, D Jarrell, J Jeans, D Jensen, H Jeon, EJ Jones, M Joo, KK Jun, S Junk, T Kamon, T Kang, J Unel, MK Karchin, PE Kartal, S Kato, Y Kemp, Y Kephart, R Kerzel, U Khotilovich, V Kilminster, B Kim, DH Kim, HS Kim, JE Kim, MJ Kim, MS Kim, SB Kim, SH Kim, TH Kim, YK King, BT Kirby, M Kirsch, L Klimenko, S Knuteson, B Ko, BR Kobayashi, H Koehn, P Kong, DJ Kondo, K Kongisberg, J Kordas, K Korn, A Korytov, A Kotelnikov, K Kotwal, AV Kovalev, A Kraus, J Kravchenko, I Kreymer, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kuznetsova, N Laasanen, AT Lai, S Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G Lauhakangas, R Lazzizzera, I Le, Y Lecci, C LeCompte, T Lee, J Lee, J Lee, SW Leonardo, N Leone, S Lewis, JD Li, K Lin, C Lin, CS Lindgren, M Liss, TM Litvintsev, DO Liu, T Liu, Y Lockyer, NS Loginov, A Loreti, M Loverre, P Lu, RS Lucchesi, D Lukens, P Lyons, L Lys, J Lysak, R MacQueen, D Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Marginean, R Martin, M Martin, A Martin, V Martiinez, M Maruyama, T Matsunaga, H Mattson, M Mazzanti, P McFarland, KS McGivern, D McIntyre, PM McNamara, P McNulty, R Menzemer, S Menzione, A Merkel, P Mesropian, C Messina, A Miao, T Miladinovic, N Miller, L Miller, R Miller, JS Miquel, R Miscetti, S Mitselmakher, G Miyamoto, A Miyazaki, Y Moggi, N Mohr, B Moore, R Morello, M Moulik, T Mukherjee, A Mulhearn, M Muller, T Mumford, R Munar, A Murat, P Nachtman, J Nahn, S Nakamura, I Nakano, I Napier, A Napora, R Naumov, D Necula, V Niell, F Nielsen, J Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Nicollerat, AS Nigmanov, T Nodulman, L Oesterberg, K Ogawa, T Oh, S Oh, YD Ohsugi, T Okusawa, T Oldeman, R Orava, R Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pashapour, S Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Plager, C Pompos, A Pondrom, L Pope, G Poukhov, O Prakoshyn, F Pratt, T Pronko, A Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Rappoccio, S Ratnikov, F Ray, H Reichold, A Rekovic, V Renton, P Rescigno, M Rimondi, F Rinnert, K Ristori, L Robertson, WJ Robson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Russ, J Ruiz, A Ryan, D Saarikko, H Safonov, A St Denis, R Sakumoto, WK Salamanna, G Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Sato, K Savard, P Schemitz, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Sfiligoi, I Shears, T Scribano, A Scuri, F Sefov, A Seidel, S Seiya, Y Semeria, F Sexton-Kennedy, L Shapiro, MD Shepard, PF Shimojima, M Shochet, M Shon, Y Shreyber, I Sidoti, A Siket, M Sill, A Sinervo, P Sisakyan, A Skiba, A Slaughter, AJ Sliwa, K Smith, JR Snider, FD Snihur, R Somalwar, SV Spalding, J Spezziga, M Spiegel, L Spinella, F Spiropulu, M Squillacioti, P Stadie, H Stefanini, A Stelzer, B Stelzer-Chilton, O Strologas, J Stuart, D Sukhanov, A Sumorok, K Sun, H Suzuki, T Taffard, A Tafirout, R Takach, SF Takano, H Takashima, R Takeuchi, Y Takikawa, K Tanaka, M Tanaka, R Tanimoto, N Tapprogge, S Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tiwari, V Tkaczyk, S Toback, D Tollefson, K Tonelli, D Tonnesmann, M Torre, S Torretta, D Trischuk, W Tseng, J Tsuchiya, R Tsuno, S Tsybychev, D Turini, N Turner, M Ukegawa, F Unverhau, T Uozumi, S Usynin, D Vacavant, L Vaiciulis, A Varganov, A Vataga, E Vejcik, S Velev, G Veramendi, G Vickey, T Vidal, R Vila, I Vilar, R Volobouev, I von der Mey, M Wagner, RG Wagner, RL Wagner, W Wallny, R Walter, T Yamashita, T Yamamoto, K Wan, Z Wang, MJ Wang, SM Warburton, A Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wittich, P Wolbers, S Wolter, M Worcester, M Worm, S Wright, T Wu, X Wurthwein, F Wyatt, A Yagil, A Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoon, P Yorita, K Yoshida, T Yu, I Yu, S Yu, Z Yun, JC Zanello, L Zanetti, A Zaw, I Zetti, F Zhou, J Zsenei, A Zucchelli, S AF Acousta, D Affolder, T Akimoto, T Albrow, MG Ambrose, D Amerio, S Amidei, D Anastassov, A Anikeev, K Annovi, A Antos, J Aoki, M Apollinari, G Arisawa, T Arguin, JF Artikov, A Ashmanskas, W Attal, A Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barker, GJ Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Booth, PSL Bortoletto, D Boudreau, J Bourov, S Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Byrum, KL Cabrera, S Calafiura, P Campanelli, M Campbell, M Canepa, A Casarsa, M Carlsmith, D Carron, S Carosi, R Castro, A Catastini, P Cauz, D Cerri, A Cerri, C Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Cho, I Cho, K Chokheli, D Chu, ML Chuang, S Chung, JY Chung, WH Chung, YS Ciobanu, CI Ciocci, MA Clark, AG Clark, D Coca, M Connolly, A Convery, M Conway, J Cordelli, M Cortiana, G Cranshaw, J Cuevas, J Culbertson, R Currat, C Cyr, D Dagenhart, D Da Ronco, S D'Auria, S de Barbaro, P De Cecco, S De Lentdecker, G Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Dininno, M De Pedis, D Derwent, PF Devlin, T Dionisi, C Dittmann, JR Doksus, P Dominguez, A Donati, S Donega, M D'Onnofrio, M Dorigo, T Drollinger, V Ebina, K Eddy, N Ely, R Erbacher, R Erdmann, M Errede, D Errede, S Eusebi, R Fang, HC Farrington, S Fedorko, I Feild, RG Feindt, M Fernandez, JP Ferretti, C Field, RD Fiori, I Flanagan, G Flaugher, B Flores-Castillo, LR Foland, A Forrester, S Foster, GW Franklin, M Frisch, H Fujii, Y Furic, I Gajjar, A Gallas, A Galyardt, J Gallinaro, M Garcia-Sciveres, M Garfinkel, AF Gay, C Gerberich, H Gerdes, DW Gerchtein, E Giagu, S Giannetti, P Gibson, A Gibson, K Ginsburg, C Giolo, K Giordani, M Giurgiu, G Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, D Goldstein, J Gomez, G Gomez-Ceballos, G Gondcharov, M Gonzalez, O Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Grosso-Pilcher, C Guenther, M da Costa, JG Haber, C Hahn, K Hahn, SR Halkiadakis, E Handler, R Happacher, F Hara, K Hare, M Harr, RF Harris, RM Hartmann, F Hatakeyama, K Hauser, J Hays, C Hayward, H Heider, E Heinemann, B Heinrich, J Hennecke, M Herndon, M Hill, C Hirschbuehl, D Hocker, A Hoffman, KD Holloway, A Hou, S Houlden, MA Huffman, BT Huang, Y Hughes, RE Huston, J Ikado, K Incandela, J Introzzi, G Iori, M Ishizawa, Y Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jang, D Jarrell, J Jeans, D Jensen, H Jeon, EJ Jones, M Joo, KK Jun, S Junk, T Kamon, T Kang, J Unel, MK Karchin, PE Kartal, S Kato, Y Kemp, Y Kephart, R Kerzel, U Khotilovich, V Kilminster, B Kim, DH Kim, HS Kim, JE Kim, MJ Kim, MS Kim, SB Kim, SH Kim, TH Kim, YK King, BT Kirby, M Kirsch, L Klimenko, S Knuteson, B Ko, BR Kobayashi, H Koehn, P Kong, DJ Kondo, K Kongisberg, J Kordas, K Korn, A Korytov, A Kotelnikov, K Kotwal, AV Kovalev, A Kraus, J Kravchenko, I Kreymer, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kuznetsova, N Laasanen, AT Lai, S Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G Lauhakangas, R Lazzizzera, I Le, Y Lecci, C LeCompte, T Lee, J Lee, J Lee, SW Leonardo, N Leone, S Lewis, JD Li, K Lin, C Lin, CS Lindgren, M Liss, TM Litvintsev, DO Liu, T Liu, Y Lockyer, NS Loginov, A Loreti, M Loverre, P Lu, RS Lucchesi, D Lukens, P Lyons, L Lys, J Lysak, R MacQueen, D Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Marginean, R Martin, M Martin, A Martin, V Martiinez, M Maruyama, T Matsunaga, H Mattson, M Mazzanti, P McFarland, KS McGivern, D McIntyre, PM McNamara, P McNulty, R Menzemer, S Menzione, A Merkel, P Mesropian, C Messina, A Miao, T Miladinovic, N Miller, L Miller, R Miller, JS Miquel, R Miscetti, S Mitselmakher, G Miyamoto, A Miyazaki, Y Moggi, N Mohr, B Moore, R Morello, M Moulik, T Mukherjee, A Mulhearn, M Muller, T Mumford, R Munar, A Murat, P Nachtman, J Nahn, S Nakamura, I Nakano, I Napier, A Napora, R Naumov, D Necula, V Niell, F Nielsen, J Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Nicollerat, AS Nigmanov, T Nodulman, L Oesterberg, K Ogawa, T Oh, S Oh, YD Ohsugi, T Okusawa, T Oldeman, R Orava, R Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pashapour, S Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Plager, C Pompos, A Pondrom, L Pope, G Poukhov, O Prakoshyn, F Pratt, T Pronko, A Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Rappoccio, S Ratnikov, F Ray, H Reichold, A Rekovic, V Renton, P Rescigno, M Rimondi, F Rinnert, K Ristori, L Robertson, WJ Robson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Russ, J Ruiz, A Ryan, D Saarikko, H Safonov, A St Denis, R Sakumoto, WK Salamanna, G Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Sato, K Savard, P Schemitz, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Sfiligoi, I Shears, T Scribano, A Scuri, F Sefov, A Seidel, S Seiya, Y Semeria, F Sexton-Kennedy, L Shapiro, MD Shepard, PF Shimojima, M Shochet, M Shon, Y Shreyber, I Sidoti, A Siket, M Sill, A Sinervo, P Sisakyan, A Skiba, A Slaughter, AJ Sliwa, K Smith, JR Snider, FD Snihur, R Somalwar, SV Spalding, J Spezziga, M Spiegel, L Spinella, F Spiropulu, M Squillacioti, P Stadie, H Stefanini, A Stelzer, B Stelzer-Chilton, O Strologas, J Stuart, D Sukhanov, A Sumorok, K Sun, H Suzuki, T Taffard, A Tafirout, R Takach, SF Takano, H Takashima, R Takeuchi, Y Takikawa, K Tanaka, M Tanaka, R Tanimoto, N Tapprogge, S Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tiwari, V Tkaczyk, S Toback, D Tollefson, K Tonelli, D Tonnesmann, M Torre, S Torretta, D Trischuk, W Tseng, J Tsuchiya, R Tsuno, S Tsybychev, D Turini, N Turner, M Ukegawa, F Unverhau, T Uozumi, S Usynin, D Vacavant, L Vaiciulis, A Varganov, A Vataga, E Vejcik, S Velev, G Veramendi, G Vickey, T Vidal, R Vila, I Vilar, R Volobouev, I von der Mey, M Wagner, RG Wagner, RL Wagner, W Wallny, R Walter, T Yamashita, T Yamamoto, K Wan, Z Wang, MJ Wang, SM Warburton, A Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wittich, P Wolbers, S Wolter, M Worcester, M Worm, S Wright, T Wu, X Wurthwein, F Wyatt, A Yagil, A Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoon, P Yorita, K Yoshida, T Yu, I Yu, S Yu, Z Yun, JC Zanello, L Zanetti, A Zaw, I Zetti, F Zhou, J Zsenei, A Zucchelli, S CA CDF Collaboration TI Search for B(s)(0)->mu(+)mu(-) and B(d)(0)->mu(+)mu(-) decays in p(p)over-bar collisions at root s=1.96 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOP-QUARK MASS; LARGE TAN-BETA; QCD CORRECTIONS; RUN II; CDF; SUPERSYMMETRY; UPGRADE AB We report on a search for B(s)(0)-->mu(+)mu(-) and B(d)(0)-->mu(+)mu(-) decays in p (p) over bar collisions at roots=1.96 TeV using 171 pb(-1) of data collected by the CDF II experiment at the Fermilab Tevatron Collider. The decay rates of these rare processes are sensitive to contributions from physics beyond the standard model. One event survives all our selection requirements, consistent with the background expectation. We derive branching ratio limits of B(B(s)(0)-->mu(+)mu(-))<5.8x10(-7) and B(B(d)(0)-->mu(+)mu(-))<1.5x10(-7) at 90% confidence level. C1 Univ Florida, Gainesville, FL 32611 USA. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02254 USA. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Inst Nucl Res, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland. Harvard Univ, Cambridge, MA 02138 USA. Helsinki Inst Phys, Helsinki Grp, FIN-00044 Helsinki, Finland. Univ Helsinki, Dept Phys Sci, Div High Energy Phys, FIN-00044 Helsinki, Finland. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. High Energy Accelerator Res Org, Tsukuba, Ibaraki 305, Japan. Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 7020701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Liverpool, Liverpool L69 7ZE, Merseyside, England. UCL, London WC1E 6BT, England. MIT, Cambridge, MA 02139 USA. McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada. Univ Toronto, Toronto, ON M5S 1A7, Canada. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Inst Theoret & Expt Phys, Moscow 117259, Russia. Univ New Mexico, Albuquerque, NM 87131 USA. Northwestern Univ, Evanston, IL 60208 USA. Ohio State Univ, Columbus, OH 43210 USA. Okayama Univ, Okayama 7008530, Japan. Osaka City Univ, Osaka 588, Japan. Univ Oxford, Oxford OX1 3RH, England. Univ Padua, Ist Nazl Fis Nucl, Sez Padova Trento, I-35131 Padua, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Scuola Normale Super Pisa, I-56100 Pisa, Italy. Univ Pittsburgh, Pittsburgh, PA 15260 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Rockefeller Univ, New York, NY 10021 USA. Univ Roma La Sapienza, Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy. Rutgers State Univ, Piscataway, NJ 08855 USA. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. Tufts Univ, Medford, MA 02155 USA. Waseda Univ, Tokyo 169, Japan. Wayne State Univ, Detroit, MI 48210 USA. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. RP Acousta, D (reprint author), Univ Florida, Gainesville, FL 32611 USA. RI Gorelov, Igor/J-9010-2015; Lysak, Roman/H-2995-2014; St.Denis, Richard/C-8997-2012; Introzzi, Gianluca/K-2497-2015; Lazzizzera, Ignazio/E-9678-2015; Chiarelli, Giorgio/E-8953-2012; Leonardo, Nuno/M-6940-2016; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Gallas Torreira, Abraham Antonio/K-6508-2014; Scodellaro, Luca/K-9091-2014; Paulini, Manfred/N-7794-2014; Russ, James/P-3092-2014; Cabrera Urban, Susana/H-1376-2015; ciocci, maria agnese /I-2153-2015; Prokoshin, Fedor/E-2795-2012; Ivanov, Andrew/A-7982-2013; Lancaster, Mark/C-1693-2008; Ruiz, Alberto/E-4473-2011; Robson, Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; Wolter, Marcin/A-7412-2012; Azzi, Patrizia/H-5404-2012; manca, giulia/I-9264-2012; Amerio, Silvia/J-4605-2012; Punzi, Giovanni/J-4947-2012; messina, andrea/C-2753-2013; Annovi, Alberto/G-6028-2012 OI Gorelov, Igor/0000-0001-5570-0133; Introzzi, Gianluca/0000-0002-1314-2580; Lazzizzera, Ignazio/0000-0001-5092-7531; Chiarelli, Giorgio/0000-0001-9851-4816; Leonardo, Nuno/0000-0002-9746-4594; Warburton, Andreas/0000-0002-2298-7315; Gallas Torreira, Abraham Antonio/0000-0002-2745-7954; Scodellaro, Luca/0000-0002-4974-8330; Paulini, Manfred/0000-0002-6714-5787; Russ, James/0000-0001-9856-9155; ciocci, maria agnese /0000-0003-0002-5462; Prokoshin, Fedor/0000-0001-6389-5399; Ivanov, Andrew/0000-0002-9270-5643; Ruiz, Alberto/0000-0002-3639-0368; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Annovi, Alberto/0000-0002-4649-4398 NR 33 TC 10 Z9 10 U1 2 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 JUL 16 PY 2004 VL 93 IS 3 AR 032001 DI 10.1103/PhysRevLett.93.032001 PG 7 WC Physics, Multidisciplinary SC Physics GA 838CX UT WOS:000222691900010 PM 15323815 ER PT J AU Anastasiou, C Melnikov, K Petriello, F AF Anastasiou, C Melnikov, K Petriello, F TI Real radiation at next-to-next-to-leading order in QCD: e(+)e(-)-> 2 jets through O(alpha(2)(s)) SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM-CHROMODYNAMIC CORRECTIONS; HIGGS-BOSON PRODUCTION; FEYNMAN-INTEGRALS; E+E ANNIHILATION; E&E ANNIHILATION; CROSS-SECTIONS; AMPLITUDES; ALGORITHM; LHC AB We present a calculation of the differential two-jet cross section in e(+)e(-) annihilation through next-to-next-to-leading order (NNLO) in the strong coupling constant alpha(s). The calculation is performed using a new method for dealing with real radiation suggested recently by us. For the first time, the two-jet event rate is computed directly, without any reference to the inclusive cross section e(+)e(-)-->hadrons. We also calculate the energy distribution of the leading jet in e(+)e(-)-->2 jets and find significant modifications of the shape of this distribution at NNLO. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA. Johns Hopkins Univ, Dept Phys, Baltimore, MD 21218 USA. RP Anastasiou, C (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM babis@slac.stanford.edu; kirill@phys.hawaii.edu; frankjp@pha.jhu.edu NR 36 TC 175 Z9 175 U1 0 U2 0 PU AMERICAN 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 JUL 16 PY 2004 VL 93 IS 3 AR 032002 DI 10.1103/PhysRevLett.93.032002 PG 4 WC Physics, Multidisciplinary SC Physics GA 838CX UT WOS:000222691900011 PM 15323816 ER PT J AU Anisimovsky, VV Artamonov, AV Bassalleck, B Bhuyan, B Blackmore, EW Bryman, DA Chen, S Chiang, IH Christidi, IA Cooper, PS Diwan, MV Frank, JS Fujiwara, T Hu, J Ivashkin, AP Jaffe, DE Kabe, S Kettell, SH Khabibullin, MM Khotjantsev, AN Kitching, P Kobayashi, M Komatsubara, TK Konaka, A Kozhevnikov, AP Kudenko, YG Kushnirenko, A Landsberg, LG Lewis, B Li, KK Littenberg, LS Macdonald, JA Mildenberger, J Mineev, OV Miyajima, M Mizouchi, K Mukhin, VA Muramatsu, N Nakano, T Nomachi, M Nomura, T Numao, T Obraztsov, VF Omata, K Patalakha, DI Petrenko, SV Poutissou, R Ramberg, EJ Redlinger, G Sato, T Sekiguchi, T Shinkawa, T Strand, RC Sugimoto, S Tamagawa, Y Tschirhart, R Tsunemi, T Vavilov, DV Viren, B Yershov, NV Yoshimura, Y Yoshioka, T AF Anisimovsky, VV Artamonov, AV Bassalleck, B Bhuyan, B Blackmore, EW Bryman, DA Chen, S Chiang, IH Christidi, IA Cooper, PS Diwan, MV Frank, JS Fujiwara, T Hu, J Ivashkin, AP Jaffe, DE Kabe, S Kettell, SH Khabibullin, MM Khotjantsev, AN Kitching, P Kobayashi, M Komatsubara, TK Konaka, A Kozhevnikov, AP Kudenko, YG Kushnirenko, A Landsberg, LG Lewis, B Li, KK Littenberg, LS Macdonald, JA Mildenberger, J Mineev, OV Miyajima, M Mizouchi, K Mukhin, VA Muramatsu, N Nakano, T Nomachi, M Nomura, T Numao, T Obraztsov, VF Omata, K Patalakha, DI Petrenko, SV Poutissou, R Ramberg, EJ Redlinger, G Sato, T Sekiguchi, T Shinkawa, T Strand, RC Sugimoto, S Tamagawa, Y Tschirhart, R Tsunemi, T Vavilov, DV Viren, B Yershov, NV Yoshimura, Y Yoshioka, T CA E949 Collaboration TI Improved measurement of the K+->pi+nu(nu)over-bar branching ratio SO PHYSICAL REVIEW LETTERS LA English DT Article AB An additional event near the upper kinematic limit for K+-->pi(+)nu(nu) over bar has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+-->pi(+)nu(nu) over bar)=(1.47(-0.89)(+1.30))x10(-10) based on three events observed in the pion momentum region 211