FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Reeves, GD Henderson, MG AF Reeves, GD Henderson, MG TI The storm-substorm relationship: Ion injections in geosynchronous measurements and composite energetic neutral atom images SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID GEOMAGNETIC DISTURBANCE; DST FIELD; POLAR; ASSOCIATION; PARTICLE; DECAY; ONSET AB We have analyzed isolated and storm time ion injections using geosynchronous particles, energetic neutral atom (ENA) data, and Dst. There are both surprising similarities between the two classes of events as well as important differences that bear directly on the relationship between storms and substorms. The average geosynchronous ion responses during the growth phase, at onset, and in the approximate to 15 min following onset are nearly identical in intensity, spectral hardness, and temporal profile. ENA observations confirm that similarity and additionally show that the two classes of injections span nearly the same extent in local time. The two classes of injections differ primarily in the subsequent behavior of the ion fluxes. For the isolated injections the fluxes return to preevent levels within about an hour, and exhibit the expected westward drift and dispersion. For the storm time injections the fluxes remain elevated for at least several hours following the initial injection. Additionally, the ENA observations show new evidence that the region of new particle injections expands eastward (opposite to the ion drift direction) to encompass most of the nightside. Within 3 hours, ENA emissions are observed coming from most of the inner magnetosphere but have still not formed a symmetric, trapped distribution. Within those same 3 hours Dst decreased an average of 40 nT with the initial decrease observed in the same hour as the initial injection. The isolated injections did not produce a measurable Dst signature. These results show that despite many remarkable similarities, storm time ion injection events are different from isolated injection events. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Reeves, GD (reprint author), Univ Calif Los Alamos Natl Lab, NIS-1,MS D-466, Los Alamos, NM 87545 USA. RI Reeves, Geoffrey/E-8101-2011; Henderson, Michael/A-3948-2011 OI Reeves, Geoffrey/0000-0002-7985-8098; Henderson, Michael/0000-0003-4975-9029 NR 22 TC 44 Z9 44 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD APR 1 PY 2001 VL 106 IS A4 BP 5833 EP 5844 DI 10.1029/2000JA003017 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 418MC UT WOS:000167895100024 ER PT J AU Friedel, RHW Korth, H Henderson, MG Thomsen, MF Scudder, JD AF Friedel, RHW Korth, H Henderson, MG Thomsen, MF Scudder, JD TI Plasma sheet access to the inner magnetosphere SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ELECTRON-SCATTERING LOSS; GEOSYNCHRONOUS ORBIT; FIELDS; SPACECRAFT; PARTICLES; MODEL; SIMULATIONS; INJECTIONS; PROTON AB We present here plasma data from the Polar HYDRA instrument giving comprehensive coverage of the inner magnetospheric region from L similar to 2 outward. Data is projected to an equatorial reference plane yielding a global view of the inner extend of the plasma sheet. We determine the inner boundary for plasma sheet electrons and ions in the mu range 0.05 - 50 eV nT(-1) and we compare these to the predicted Alfven boundaries as a function of the geomagnetic activity index Kp. In general, the simple conventional drift paradigm is shown to be globally consistent with the averaged data in the inner magnetosphere, with electrons adhering better to the predicted boundaries than ions. The data are further compared to the geosynchronous slice as measured by the Los Alamos Magnetospheric Plasma Analyzer (MPA) which measures the crossing point of the Alfven boundaries at geosynchronous altitudes with much better statistical resolution than Polar Integral to the drift model used is an assumption about the form of the global electric field. The agreement with data validates the simple corotation and convection electric field used and shows that this model describes well the average transport for a wide range of geomagnetic activity and over a large part of the inner magnetosphere. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. RP Friedel, RHW (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. RI Friedel, Reiner/D-1410-2012; Scudder, Jack/D-8417-2013; Henderson, Michael/A-3948-2011 OI Friedel, Reiner/0000-0002-5228-0281; Scudder, Jack/0000-0001-7975-5630; Henderson, Michael/0000-0003-4975-9029 NR 24 TC 36 Z9 38 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD APR 1 PY 2001 VL 106 IS A4 BP 5845 EP 5858 DI 10.1029/2000JA003011 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 418MC UT WOS:000167895100025 ER PT J AU Liou, K Meng, CI Newell, PT Lui, ATY Reeves, GD Belian, RD AF Liou, K Meng, CI Newell, PT Lui, ATY Reeves, GD Belian, RD TI Particle injections with auroral expansions SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID TAIL CURRENT DISRUPTION; PLASMA SHEET; GEOSYNCHRONOUS ORBIT; GEOMAGNETIC-ACTIVITY; SUBSTORM INJECTIONS; BOUNDARY; SIGNATURES; SATELLITE; REGIONS; ONSETS AB We compare the onset of dispersionless energetic particle injections, observed as a sudden increase of energetic (tens to hundreds of keV) electron and ion fluxes on a timescale of similar to1 min, with the start of auroral breakups. A total of 34 dispersionless injections observed by Los Alamos National Laboratory (LANL) satellites are analyzed, and their corresponding auroral breakups are determined with global amoral images acquired from the Polar ultraviolet imager. An important finding is that dispersionless injections can actually be associated with substorm intensification. The injection time at LANL relative to the start of amoral breakups varies from -2 to 8 min and can sometimes be more than 10 min. The average lag time for the injections compared to the auroral breakups is 1.8 min with a standard deviation of 2.5 min. It is suggested that particle energization must take place in the magnetotail similar to1 min earlier than the start of the explosive amoral substorm onset, while the delay of the injections at LANL is due to a propagation effect. An implied average earthward injection boundary is estimated to be similar to 6.9 - 9.2 RE Further analysis of the delay time indicates that the transport of substorm injections is associated with the enhancement of convection electric field by a factor of similar to5, corresponding to an earthward convection how speed of 5 - 120 km s(-1) Dispersionless injections can take place in a fairly wide magnetic local time (MLT) region from 2000 to 0100 MLT with a peak at 2200 MLT, where amoral breakups occur most frequently. More importantly, dispersionless injections have ionospheric footprints clustered around the location of amoral breakup within +/-1 hour of MLT, further supporting the concept of the close relationship between the substorm injections and the amoral breakups. C1 Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Liou, K (reprint author), Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA. RI Reeves, Geoffrey/E-8101-2011; Liou, Kan/C-2089-2016 OI Reeves, Geoffrey/0000-0002-7985-8098; Liou, Kan/0000-0001-5277-7688 NR 42 TC 22 Z9 22 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD APR 1 PY 2001 VL 106 IS A4 BP 5873 EP 5881 DI 10.1029/2000JA003003 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 418MC UT WOS:000167895100027 ER PT J AU Trattner, KJ Fuselier, SA Peterson, WK Chang, SW Friedel, R Aellig, MR AF Trattner, KJ Fuselier, SA Peterson, WK Chang, SW Friedel, R Aellig, MR TI Origins of energetic ions in the cusp SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID EARTHS BOW SHOCK; PARALLEL COLLISIONLESS SHOCK; PLASMA DEPLETION LAYER; ULF POWER SPECTRA; SOLAR-WIND; DIFFUSE IONS; DAYSIDE MAGNETOPAUSE; MAGNETOSPHERIC IONS; MEV HELIUM; UPSTREAM AB Recent studies reported on a new magnetospheric phenomenon called cusp energetic particle (CEP) events. It; has been suggested that these energetic particles with significant fluxes up to several hundred keV/e are accelerated locally in the cusp. An alternative explanation for the energetic particle events is that they are accelerated at the quasi-parallel bow shock, then transported downstream and enter the cusp along newly reconnected field lines or some other solar wind entry mechanism. It is well known that shock-accelerated ions have characteristic abundance ratios, composition ratios relative to the solar wind composition, temperatures, and spectral dependency on solar wind conditions. These parameters are used to distinguish between a local (cusp) and remote (bow shock) acceleration. Our results show that average values of these parameters in the cusp are comparable to those at quasi-parallel shocks. Furthermore, changes in some of these parameters indicate a solar wind entry process that depends on energy and mass. No local acceleration is required to explain the observed CEP events up to 150 keV/e. For ions above 150 keV/e the magnetosphere itself may be responsible for the observed cusp fluxes. C1 Lockheed Martin Adv Technol Ctr, Palo Alto, CA 94304 USA. MIT, Ctr Space Res, Cambridge, MA 02139 USA. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Trattner, KJ (reprint author), Lockheed Martin Adv Technol Ctr, 3251 Hanover Str,B255,L9-42, Palo Alto, CA 94304 USA. RI Friedel, Reiner/D-1410-2012; Peterson, WK/A-8706-2009 OI Friedel, Reiner/0000-0002-5228-0281; Peterson, WK/0000-0002-1513-6096 NR 52 TC 33 Z9 33 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD APR 1 PY 2001 VL 106 IS A4 BP 5967 EP 5976 DI 10.1029/2000JA003005 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 418MC UT WOS:000167895100035 ER PT J AU Su, YJ Borovsky, JE Thomsen, MF Dubouloz, N Chandler, MO Moore, TE Bouhram, M AF Su, YJ Borovsky, JE Thomsen, MF Dubouloz, N Chandler, MO Moore, TE Bouhram, M TI Plasmaspheric material on high-latitude open field lines SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MAGNETOPAUSE RECONNECTION; PLASMA; CUSP; ORIGIN AB During periods of increased geomagnetic activity, cold and dense plasmaspheric material is observed to drain from the inner magnetosphere toward the dayside magnetopause. Geosynchronous observations have shown that plasmaspheric material may participate in the dayside reconnection. However, predictions of plasmaspheric material passing through the polar region on recently opened field lines have not yet been confirmed by observations. We present evidence for the existence of such plasmaspheric material on high-latitude open magnetic field lines based on our investigations of 20 months of Interball/Hyperboloid observations and 11 months of Polar/Thermal Ion Dynamics Experiment (TIDE) observations. In order to distinguish plasmaspheric material from the low-energy portion of entering magnetosheath plasma from the solar wind, observed phase-space densities are compared to modeled magnetosheath and plasmaspheric phase-space densities. The phase-space density distribution function of magnetosheath ions is estimated from upstream solar wind parameters using the gasdynamic theory. Twenty-one events were found in which Interball passed through open field lines on the dayside during periods of increased geomagnetic activity, two of which show evidence for the presence of plasmaspheric material. Additionally, six such events were identified from the Polar/TIDE database. Although the occurrence frequency is low, evidence of cold plasmaspheric material being transported on high-latitude open field lines does exist. C1 Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Ctr Etud Environm Terrestre & Planetaire, F-94107 St Maur, France. NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA. NASA, Goddard Space Flight Ctr, Extraterr Phys Lab, Greenbelt, MD 20771 USA. RP Su, YJ (reprint author), Univ Colorado, Atmospher & Space Phys Lab, 1234 Innovat Dr, Boulder, CO 80303 USA. RI Moore, Thomas/D-4675-2012 OI Moore, Thomas/0000-0002-3150-1137 NR 22 TC 21 Z9 21 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD APR 1 PY 2001 VL 106 IS A4 BP 6085 EP 6095 DI 10.1029/2000JA003008 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 418MC UT WOS:000167895100044 ER PT J AU Lukas, A Ramond, P Romanino, A Ross, GG AF Lukas, A Ramond, P Romanino, A Ross, GG TI Neutrino masses and mixing in brane-world theories SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Article DE extra large dimensions; solar and atmospheric neutrinos; neutrino physics ID LARGE EXTRA DIMENSIONS; STERILE NEUTRINO; SUPER-KAMIOKANDE; SOLAR; OSCILLATIONS; MILLIMETER; SCALES; BOUNDS; STARS; TEV AB We present a comprehensive study of five-dimensional brane-world models for neutrino physics based on at compactifications. Particular emphasis is put on the inclusion of bulk mass terms. We derive a number of general results for such brane-world models with bulk mass terms. In particular, in the limit of small brane-bulk couplings, the electroweak eigenstates are predominantly given as a superposition of three light states with non-trivial small admixtures of bulk states. As a consequence, neutrinos can undergo standard oscillations as well as oscillation into bulk Kaluza-Klein states. We use this structure to construct a specific model based on Z(2) orbifolding and bulk Majorana masses which is compatible with all observed oscillation phenomena. The solar neutrino deficit is explained by oscillations into sterile bulk states while the atmospheric neutrino deficit is due to v(mu) - v(tau) oscillations with naturally maximal mixing. In addition, the model can accommodate the LSND result and a significant neutrino dark matter component. We also analyze the constraints from supernova energy loss on neutrino brane-world theories and show that our specific model is consistent with these constraints. C1 Univ Sussex, Ctr Theoret Phys, Brighton BN1 9QJ, E Sussex, England. Univ Florida, Dept Phys, Inst Fundamental Theory, Gainesville, FL 32611 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Oxford, Dept Phys, Oxford OX1 3NP, England. RP Lukas, A (reprint author), Univ Sussex, Ctr Theoret Phys, Brighton BN1 9QJ, E Sussex, England. EM andrel@pact.cpes.susx.ac.uk; ramond@phys.ufl.edu; romanino@fnal.gov; g.ross@physics.oxford.ac.uk RI Romanino, Andrea/I-3480-2012 OI Romanino, Andrea/0000-0002-5915-4747 NR 51 TC 36 Z9 36 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1029-8479 J9 J HIGH ENERGY PHYS JI J. High Energy Phys. PD APR PY 2001 IS 4 AR 010 PG 51 WC Physics, Particles & Fields SC Physics GA 444ET UT WOS:000169386600010 ER PT J AU Huffman, PR Brome, CR Butterworth, JS Dzhosyuk, SN Golub, R Lamoreaux, SK Mattoni, CEH McKinsey, DN Doyle, JM AF Huffman, PR Brome, CR Butterworth, JS Dzhosyuk, SN Golub, R Lamoreaux, SK Mattoni, CEH McKinsey, DN Doyle, JM TI Magnetically stabilized luminescent excitations in hexagonal boron nitride SO JOURNAL OF LUMINESCENCE LA English DT Article DE boron nitride; magnetic stabilization ID BAND-GAP; FILMS AB Magnetically stabilized luminescence is observed in hexagonal boron nitride. The luminescence is induced by absorption of cold neutrons and is in the visible region. In the absence of a magnetic field, the photon emission level is observed to decay over several hundred seconds. A fraction of this luminescence can be suppressed if the temperature is T less than or similar to0.6 K and the magnetic field is B less than or similar to 1.0 T. Subsequent to irradiation and suppression, luminescence can be induced by an increase in T or lowering of B. Possible explanations include stabilization of triplet states or the localization and stabilization of excitons. (C) 2001 Elsevier Science B,V. All rights reserved. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. Harvard Univ, Cambridge, MA 02138 USA. Hahn Meitner Inst Kernforsch Berlin GmbH, D-1000 Berlin, Germany. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Huffman, PR (reprint author), Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. OI Huffman, Paul/0000-0002-2562-1378 NR 18 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 2001 VL 92 IS 4 BP 291 EP 296 DI 10.1016/S0022-2313(01)00166-1 PG 6 WC Optics SC Optics GA 416WZ UT WOS:000167804500005 ER PT J AU Jerschow, A Logan, JW Pines, A AF Jerschow, A Logan, JW Pines, A TI High-resolution NMR of quadrupolar nuclei using mixed multiple-quantum coherences SO JOURNAL OF MAGNETIC RESONANCE LA English DT Article; Proceedings Paper CT Rocky Mountains Conference on Analytical Chemistry CY JUL 31-AUG 04, 2000 CL BROOMFIELD, COLORADO DE high-resolution solid-state NMR; MQMAS; quadrupolar nuclei; multiple quantum coherence ID ANGLE-SPINNING NMR; MAS NMR; MAGNETIC-RESONANCE; CORRELATION SPECTROSCOPY; SOLIDS; PULSES AB A multiple-quantum magic angle spinning (MQMAS) NMR experiment of quadrupolar nuclei is demonstrated, which uses two different multiple quantum coherences in tl to refocus the quadrupolar broadening. This experiment has the potential of achieving improved resolution over current techniques. (C) 2001 Academic Press. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Pines, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. OI Jerschow, Alexej/0000-0003-1521-9219 NR 16 TC 18 Z9 18 U1 0 U2 4 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1090-7807 J9 J MAGN RESON JI J. Magn. Reson. PD APR PY 2001 VL 149 IS 2 BP 268 EP 270 DI 10.1006/jmre.2001.2303 PG 3 WC Biochemical Research Methods; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Biochemistry & Molecular Biology; Physics; Spectroscopy GA 431JN UT WOS:000168628200013 PM 11318628 ER PT J AU Petrovic, C Hundley, MF Movshovich, R Pagliuso, PG Sarrao, JL Thompson, JD Fisk, Z Garcia, A Granado, E Torriani, I Rettori, C AF Petrovic, C Hundley, MF Movshovich, R Pagliuso, PG Sarrao, JL Thompson, JD Fisk, Z Garcia, A Granado, E Torriani, I Rettori, C TI Possible mixed valence behavior of CeIr2Ga and YbIr2Ga SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article DE crystal growth; heat capacity; valence fluctuations ID HEAT AB We report possible mixed valence behavior in the new ternary compounds CeIr2Ga and YbIr2Ga. These materials crystallize in the hexagonal Na3As structure of space group P6(3)cm. Magnetization, specific heat and transport measurements show reduced magnetic moments and the absence of magnetic order above 0.04K. The quasi-2D structure of these compounds offers the possibility for investigating the role of spatial dimensionality on mixed valence phenomena. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Florida State Univ, NHMFL, Tallahassee, FL 32306 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil. RP Petrovic, C (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RI Petrovic, Cedomir/A-8789-2009; Rettori, Carlos/C-3966-2012; Pagliuso, Pascoal/C-9169-2012; Granado, Eduardo/F-5389-2012; Torriani, Iris/E-5686-2010; Inst. of Physics, Gleb Wataghin/A-9780-2017 OI Petrovic, Cedomir/0000-0001-6063-1881; Rettori, Carlos/0000-0001-6692-7915; NR 5 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD APR PY 2001 VL 225 IS 3 BP 317 EP 321 DI 10.1016/S0304-8853(01)00146-9 PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 426BJ UT WOS:000168329200001 ER PT J AU Asch, BB Barcellos-Hoff, MH AF Asch, BB Barcellos-Hoff, MH TI Epigenetics and breast cancer SO JOURNAL OF MAMMARY GLAND BIOLOGY AND NEOPLASIA LA English DT Editorial Material C1 Roswell Pk Canc Inst, Div Expt Pathol, Buffalo, NY 14263 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Asch, BB (reprint author), Roswell Pk Canc Inst, Div Expt Pathol, Buffalo, NY 14263 USA. NR 2 TC 10 Z9 10 U1 0 U2 1 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1083-3021 J9 J MAMMARY GLAND BIOL JI J. Mammary Gland Biol. Neoplasia PD APR PY 2001 VL 6 IS 2 BP 151 EP 152 DI 10.1023/A:1011306222533 PG 2 WC Oncology; Endocrinology & Metabolism; Physiology SC Oncology; Endocrinology & Metabolism; Physiology GA 456QF UT WOS:000170093200001 PM 11501575 ER PT J AU Barcellos-Hoff, MH AF Barcellos-Hoff, MH TI It takes a tissue to make a tumor: Epigenetics, cancer and the microenvironment SO JOURNAL OF MAMMARY GLAND BIOLOGY AND NEOPLASIA LA English DT Article DE carcinogenesis; epigenetics; mammary; ionizing radiation; stroma; tissue ID GROWTH-FACTOR-BETA; MAMMARY EPITHELIAL-CELLS; BREAST-CARCINOMA CELLS; TGF-BETA; INTERCELLULAR INDUCTION; TRANSGENIC MICE; MOUSE SKIN; IN-VIVO; GENOMIC INSTABILITY; MALIGNANT PHENOTYPE AB How do normal tissues limit the development of cancer? This review discusses the evidence that normal cells effectively restrict malignant behavior, and that such tissue forces must be subjugated to establish a tumor. The action of ionizing radiation will be specifically discussed regarding the disruption of the microenvironment that promotes the transition from preneoplastic to neoplastic growth. Unlike the highly unpredictable nature of genetic mutations, the response of normal cells to radiation damage follows an epigenetic program similar to wound healing and other damage responses. Our hypothesis is that the persistent disruption of the microenvironment in irradiated tissue compromises its ability to suppress carcinogenesis. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Barcellos-Hoff, MH (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Bldg 74-174,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 85 TC 74 Z9 80 U1 1 U2 7 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1083-3021 J9 J MAMMARY GLAND BIOL JI J. Mammary Gland Biol. Neoplasia PD APR PY 2001 VL 6 IS 2 BP 213 EP 221 DI 10.1023/A:1011317009329 PG 9 WC Oncology; Endocrinology & Metabolism; Physiology SC Oncology; Endocrinology & Metabolism; Physiology GA 456QF UT WOS:000170093200007 PM 11501581 ER PT J AU Yaswen, P Stampfer, MR AF Yaswen, P Stampfer, MR TI Epigenetic changes accompanying human mammary epithelial cell immortalization SO JOURNAL OF MAMMARY GLAND BIOLOGY AND NEOPLASIA LA English DT Article DE immortality; senescence; telomerase; TGF beta; p16(INK4a); p57(KIP2) ID DEPENDENT KINASE INHIBITOR; HUMAN PAPILLOMAVIRUS; TELOMERASE ACTIVITY; HUMAN FIBROBLASTS; POLY(ADP-RIBOSE) POLYMERASE; P16 INACTIVATION; DNA METHYLATION; LIFE-SPAN; PROTEIN; GROWTH AB Acquisition of immortality may be an early and crucial step in malignant progression. We hypothesize that acquisition of unlimited growth potential in individual human mammary epithelial cells (HMEC)(3) requires inactivation of several distinct negative growth constraints as well as reactivation of a mechanism to maintain telomeres on chromosomes. Some of the heritable changes that occur during HMEC immortalization, i.e., loss of expression of cyclin dependent kinase inhibitors p16(INK4a) and p57(KIP2), loss of TGF beta -mediated growth inhibition, and derepression of telomerase, appear to occur without identifiable mutations in the genes and pathways involved. The absence of mutations, combined with the fact that the changes are often incremental over several cell generations even in clonal populations indicates that some changes associated with immortalization can be epigenetic. We have used the term "conversion" to describe the gradual epigenetic process in chemical carcinogen-immortalized HMEC that leads to activation of telomerase, stabilization of telomere length, and ability to grow uniformly well in the presence or absence of TGF beta. Characterization of the epigenetic mechanisms involved in immortalization may uncover additional factors that drive tumor progression, and that may be responsive to novel forms of intervention. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Cell & Mol Biol, Berkeley, CA 94720 USA. RP Yaswen, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Cell & Mol Biol, Mailstop 70A-1118,1 Cyclotron Rd, Berkeley, CA 94720 USA. FU NCI NIH HHS [CA-24844] NR 51 TC 9 Z9 9 U1 1 U2 2 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1083-3021 J9 J MAMMARY GLAND BIOL JI J. Mammary Gland Biol. Neoplasia PD APR PY 2001 VL 6 IS 2 BP 223 EP 234 DI 10.1023/A:1011364925259 PG 12 WC Oncology; Endocrinology & Metabolism; Physiology SC Oncology; Endocrinology & Metabolism; Physiology GA 456QF UT WOS:000170093200008 PM 11501582 ER PT J AU Todd, PJ Schaaff, TG Chaurand, P Caprioli, RM AF Todd, PJ Schaaff, TG Chaurand, P Caprioli, RM TI Organic ion imaging of biological tissue with secondary ion mass spectrometry and matrix-assisted laser desorption/ionization SO JOURNAL OF MASS SPECTROMETRY LA English DT Article DE mass spectrometry; imaging; tissue; secondary ion mass spectrometry; matrix-assisted laser desorption/ionization ID POST-SOURCE DECAY; CAPTURE MICRODISSECTION; DESORPTION; MICROSCOPY; ELECTRON; PEPTIDE; MALDI; BRAIN; SIMS; IDENTIFICATION AB Organic secondary ion mass spectrometry (SIMS) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry can be used to produce molecular images of samples. This is achieved through ionization from a clearly identified point on a flat sample, and performing a raster of the sample by moving the point of ionization over the sample surface. The unique analytical capabilities of mass spectrometry for mapping a variety of biological samples at the tissue level are discussed. SIMS provides information on the spatial distribution of the elements and low molecular mass compounds as well as molecular structures on these compounds, while MALDI yields spatial information about higher molecular mass compounds, including their distributions in tissues at very low levels, as well as information on the molecular structures of these compounds. Application of these methods to analytical problems requires appropriate instrumentation, sample preparation methodology, and a data presentation usually in a three-coordinate plot where x and y are physical dimensions of the sample and z is the signal amplitude. The use of imaging mass spectrometry is illustrated with several biological systems. Copyright (C) 2001 John Wiley & Sons, Ltd. C1 Vanderbilt Univ, Mass Spectrometry Res Ctr, Nashville, TN 37232 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Vanderbilt Univ, Dept Biochem, Nashville, TN 37232 USA. RP Caprioli, RM (reprint author), Vanderbilt Univ, Mass Spectrometry Res Ctr, 221 Kirkland Hall, Nashville, TN 37232 USA. FU NIGMS NIH HHS [GM 41617, GM 58008] NR 45 TC 229 Z9 233 U1 6 U2 58 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1076-5174 J9 J MASS SPECTROM JI J. Mass Spectrom. PD APR PY 2001 VL 36 IS 4 BP 355 EP 369 DI 10.1002/jms.153 PG 17 WC Biochemical Research Methods; Chemistry, Analytical; Spectroscopy SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy GA 428TM UT WOS:000168476800001 PM 11333438 ER PT J AU Dannenberg, R Stach, E Groza, JR AF Dannenberg, R Stach, E Groza, JR TI Phenomenological description of grain growth stagnation for nanocrystalline films and powders SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID DENSIFICATION AB We provide a phenomenological grain growth stagnation force incorporating a near-linear temperature dependence of stagnated grain sizes and irreversible growth. The resulting law captures the observation of the restart of grain growth in the size versus time plateau on temperature increases. This description also reduces to standard laws commonly used for data fitting. The law may be useful for workers who wish to characterize a nanocrystalline film or powder annealing process predictively from a limited number of measurements or may be useful in a designed experiment. Other laws are discussed and compared. Fits to size versus time data from the literature are successfully made. C1 AFG Dev Corp, Petaluma, CA 94954 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. Univ Calif Davis, Dept Chem Engn Mat Sci, Davis, CA 95616 USA. RP Dannenberg, R (reprint author), AFG Dev Corp, Petaluma, CA 94954 USA. RI Stach, Eric/D-8545-2011 OI Stach, Eric/0000-0002-3366-2153 NR 11 TC 6 Z9 6 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD APR PY 2001 VL 16 IS 4 BP 1090 EP 1095 DI 10.1557/JMR.2001.0151 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA 419BV UT WOS:000167930200025 ER PT J AU Huang, JY Zhu, YT Mori, H AF Huang, JY Zhu, YT Mori, H TI Structure and phase characteristics of amorphous boron-carbon-nitrogen under high pressure and high temperature SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CUBIC C-BN; NITRIDE; DIAMOND; CRYSTALLIZATION; EELS; BC2N; HRTEM; GPA AB An amorphous boron-carbon-nitrogen (a-BCN) phase was synthesized by ball milling of a mixture of hexagonal BN (h-BN) and graphite with a nominal composition of (BN)(0.5)C-0.5 in atomic ratio. Electron energy-loss spectroscopy studies indicated that the bonding of the a-BCN is in an sp(2) configuration and the mixing between the BN and the C species was achieved at a nanometer scale, but the a-BCN phase was more likely a mechanical mixture rather than a chemical mixture. High-pressure and high-temperature (HPHT) treatment at 7.7 GPa and 2300 degreesC of the a-BCN phase resulted in complete segregation of the carbon and BN species, forming a nanocrystalline composite material comprising cubic BN (c-BN), amorphous carbon, and turbostratic graphite. The grain size of the c-BN phase was about 70 nm. No mutual solubilities between c-BN and carbon were found, and the two different species (C and BN) were well separated. An epitaxial relationship, i.e., the (0002) planes of graphite being parallel to the (111) planes of c-BN, was also found. The formation of ternary BCN phases was never found in the present experiment. Our experimental results also suggest the possibility of synthesizing c-BN grains encapsulated with graphite under controlled HPHT conditions. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Osaka Univ, Ultra High Voltage Electron Microscopy Res Ctr, Suita, Osaka 5650871, Japan. RP Huang, JY (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS G755, Los Alamos, NM 87545 USA. RI Zhu, Yuntian/B-3021-2008; Huang, Jianyu/C-5183-2008 OI Zhu, Yuntian/0000-0002-5961-7422; NR 20 TC 14 Z9 14 U1 1 U2 9 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD APR PY 2001 VL 16 IS 4 BP 1178 EP 1184 DI 10.1557/JMR.2001.0162 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA 419BV UT WOS:000167930200036 ER PT J AU Petrovic, JJ AF Petrovic, JJ TI Mechanical properties of meteorites and their constituents SO JOURNAL OF MATERIALS SCIENCE LA English DT Review ID ASTEROIDS AB A review is presented of the mechanical properties of meteorites and meteorite constituents. Scientific literature data on the strength of stony and iron meteorites are extremely limited. The average mechanically-measured stony meteorite compressive strength is 200 MPa, while the average iron meteorite compressive strength is 430 MPa. However, the best current estimate of the strength of stony bodies in space may be in the range of only 1-5 MPa, based on observations of meteorite fragmentation due to dynamic atmospheric loading upon Earth entry. Mechanical property and behavior information on both iron-nickel alloy and mineral meteorite constituents is also surprisingly limited in the metallurgical, rock mechanics, and ceramics literature. (C) 2001 Kluwer Academic Publishers. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Petrovic, JJ (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. NR 33 TC 32 Z9 32 U1 1 U2 9 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD APR PY 2001 VL 36 IS 7 BP 1579 EP 1583 DI 10.1023/A:1017546429094 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA 418VF UT WOS:000167914300001 ER PT J AU Lytle, CA Fuller, ME Gan, YDM Peacock, A DeFlaun, MF Onstott, TC White, DC AF Lytle, CA Fuller, ME Gan, YDM Peacock, A DeFlaun, MF Onstott, TC White, DC TI Utility of high performance liquid chromatography/electrospray/mass spectrometry of polar lipids in specifically Per-C-13 labeled Gram-negative bacteria DA001 as a tracer for acceleration of bioremediation in the subsurface SO JOURNAL OF MICROBIOLOGICAL METHODS LA English DT Article DE environmental detection of bacteria; Per C-13-labeled fatty acids; electrospray ionization; phospholipids; phosphatidylglycerol; phospatidylethanolamine; high performance liquid chromatography/electrospray ionization/mass spectrometry ID MASS-SPECTROMETRY; MICROBIAL ECOLOGY; TRANSPORT; PHOSPHOLIPIDS; BIODIVERSITY; SEPARATION; ADHESION; CELLS AB Specific fatty acids from phosphatidylglycerol (PG) and phosphatidylethanolamine (PE) recovered from a per C-13-labeled bacteria can be detected in environmental samples and used as measures of bacterial transport in the subsurface. Detection of palmitic acid (16:0) and oleic acid (18:1) at m/z 271 (255 + 16) and 299 (281 + 18) as negative ions in PG and PE separated by high performance liquid chromatography (HPLC) and detected after up-front collisionally induced dissociation (CID) utilizing electrospray (ES) mass spectrometry (MS) provided sufficient sensitivity and specificity for detection in the presence of the indigenous microbiota. Application of tandem mass spectrometry (MS/MS) in the multiple reaction monitoring (MRM) was use to monitor selected transitions. MRM can increase the sensitivity so that polar lipids recovered from cell densities currently at about 10(4) cells/sample can be detected. This technology provides a non-intrusive mechanism for monitoring the distribution of bacteria added to accelerate in situ bioremediation of subsurface sediments. (C) 2001 Elsevier Science B.V, All rights reserved. C1 Univ Tennessee, Ctr Environm Biotechnol, Knoxville, TN 37932 USA. Princeton Res Ctr, Envirogen Inc, Lawrenceville, NJ 08648 USA. Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37983 USA. RP White, DC (reprint author), Univ Tennessee, Ctr Environm Biotechnol, 10515 Res Dr,Suite 300, Knoxville, TN 37932 USA. NR 26 TC 7 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-7012 J9 J MICROBIOL METH JI J. Microbiol. Methods PD APR PY 2001 VL 44 IS 3 BP 271 EP 281 DI 10.1016/S0167-7012(00)00245-1 PG 11 WC Biochemical Research Methods; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA 416CX UT WOS:000167763600010 PM 11240050 ER PT J AU Morris, GM Micca, PL Rezvani, M Hopewell, JW Coderre, JA AF Morris, GM Micca, PL Rezvani, M Hopewell, JW Coderre, JA TI Boron neutron capture therapy: Effects of split dose and overall treatment time SO JOURNAL OF NEURO-ONCOLOGY LA English DT Article DE BNCT; 9L gliosarcoma; oral mucosa; split dose; repopulation; tumour ablation; long term survival ID MOUSE TONGUE EPITHELIUM; PARA-BORONOPHENYLALANINE; PROLIFERATION KINETICS; P-BORONOPHENYLALANINE; RADIATION RESPONSE; ORAL-MUCOSA; IRRADIATION; REPOPULATION; TISSUE; GLIOSARCOMAS AB New clinical protocols are being developed that will entail the administration of considerably higher doses of the boron delivery agent boronophenylalanine (BPA) than those in current clinical use. Fractionation (2 or 4 fractions) of BPA mediated boron neutron capture therapy (BNCT) is also under consideration at some clinical centres. Given the considerably higher infusion volumes that will be entailed in the delivery of BPA in the new high dosage protocols, there will be a requirement to extend the gap between fractions to 2 or more days. In order to assess the effects of a 2 fraction protocol on the therapeutic efficacy of BPA mediated BNCT, a series of split dose irradiations (two equal fractions) were undertaken using the rat intracranially implanted 9L gliosarcoma model. A single dose exposure to BPA mediated BNCT of 3.0 Gy resulted in long term survival levels of 50%. Survival levels increased to 71% and 77% with a 3 and 5 day gap between dose fractions (two equal fractions), respectively, using the same total dose. A further increase in the time interval between dose fractions to 7 days resulted in a reduction in survival to 36%. However, there was no significant difference between the single dose and the 3, 5 and 7 day survival data (P > 0.1) The difference between the 5 and 7 day split dose survival data was of border-line significance (P = 0.05). It is anticipated that mucositis, could become a potential problem in future BNCT clinical protocols involving higher doses, larger field sizes or multiple fields. The potential sparing of the oral mucosa, due to repopulation during the interval between the two fractions, was investigated using a series of split dose BPA mediated BNC irradiations. The ventral surface of the rat tongue was utilised as a model for oral mucosa. The ED(5)0 (50% incidence) values for the ulceration end point were 3.0 +/-0.1,3.2 +/-0.1,3.0 +/-0.1 and 3.6 +/-0.1 Gy, for 3, 5, 7 and 9 day splits between doses, respectively. It is evident from this data that there were no significant changes in the ED(5)0 (p < 0.001) until the 9 day dose split, when the ED50 value was 20% higher than the ED(5)0 value after a 7 day split. It was concluded that the two fraction BNCT protocol, with dose splits of up to 5 days, did not diminish the therapeutic response of the rat 9L gliosarcoma, when compared with a single dose BNCT protocol. Tolerance of the oral mucosa to BNC irradiation was not increased until there was a 9 day gap between fractions. However, the beneficial effects of dose sparing at this time interval between doses, would probably be counteracted by a reduction in the therapeutic effectiveness of the BNCT modality, due to repopulation of tumour clonogens between doses. C1 Univ Oxford, Churchill Hosp, Res Inst, Oxford OX3 7LJ, England. Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. RP Morris, GM (reprint author), Univ Oxford, Churchill Hosp, Res Inst, S Parks Rd, Oxford OX3 7LJ, England. NR 32 TC 3 Z9 3 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-594X J9 J NEURO-ONCOL JI J. Neuro-Oncol. PD APR PY 2001 VL 52 IS 2 BP 101 EP 110 DI 10.1023/A:1010689822493 PG 10 WC Oncology; Clinical Neurology SC Oncology; Neurosciences & Neurology GA 446LU UT WOS:000169515400001 PM 11508809 ER PT J AU Miura, M Joel, DD Smilowitz, HM Nawrocky, MM Micca, PL Hoch, DA Coderre, JA Slatkin, DN AF Miura, M Joel, DD Smilowitz, HM Nawrocky, MM Micca, PL Hoch, DA Coderre, JA Slatkin, DN TI Biodistribution of copper carboranyltetraphenylporphyrins in rodents bearing an isogeneic or human neoplasm SO JOURNAL OF NEURO-ONCOLOGY LA English DT Article DE porphyrin; BNCT; brain; gliomas; rats; mice ID NEUTRON-CAPTURE THERAPY; P-BORONOPHENYLALANINE AB The biodistributions of carborane-containing copper porphyrins, CuTCP and CuTCPH, have been studied previously in mice bearing subcutaneously implanted mammary carcinomas. We now report biodistributions of those porphyrins in Fischer 344 rats bearing intracranial and/or multiple subcutaneous isogeneic 9L gliosarcomas (9LGS). The porphyrin was given either by i.v. infusion or by multiple i.p. injections. When 190 mg CuTCPH/kg body weight was given to the rats by i.v. infusion, median tissue boron concentrations (mug/g) 3 days after the end of infusion were: 64 in subcutaneous tumor, 13 in intracranial tumor, 1 in blood and 3 in brain. When 450 mg CuTCPH/kg body weight was given to the rats by serial i.p. injections, the median concentrations (mug B/g) 4 days after the last injection were: 117 in subcutaneous tumor, 50 in intracranial tumor, 4 in blood, and 4 in brain. CuTCPH biodistribution was also studied in xenografts of the human malignant gliomas U87 and U373, and of the murine EMT-6 mammary carcinoma and the rat 9LGS, each grown subcutaneously in mice with severe combined immunodeficiency (SCIDs). In SCIDs, median boron concentrations (mug/g) 2 days after the last s.c. injection of a total of 190 mg CuTCPH/kg body weight were: 251 in U373, 33 in U87, <0.6 in blood and <0.5 in brain. Because there were such high boron levels in the U373, and because xenografted U373 is similar to spontaneous intracerebral human glioblastoma multiforme (GBM) microscopically, CuTCPH could prove useful as a boron carrier for boron neutron-capture therapy (BNCT) of GBM and of other human malignant gliomas. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Univ Connecticut, Ctr Hlth, Dept Pharmacol, Farmington, CT USA. RP Miura, M (reprint author), Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. NR 10 TC 11 Z9 11 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-594X J9 J NEURO-ONCOL JI J. Neuro-Oncol. PD APR PY 2001 VL 52 IS 2 BP 111 EP 117 DI 10.1023/A:1010622319892 PG 7 WC Oncology; Clinical Neurology SC Oncology; Neurosciences & Neurology GA 446LU UT WOS:000169515400002 PM 11508810 ER PT J AU Issakhanian, M Chang, L Cornford, M Witt, M Speck, O Goldberg, M Ernst, T AF Issakhanian, M Chang, L Cornford, M Witt, M Speck, O Goldberg, M Ernst, T TI HIV-2 infection with cerebral toxoplasmosis and lymphomatoid granulomatosis SO JOURNAL OF NEUROIMAGING LA English DT Article DE brain; magnetic resonance imaging (MRI); perfusion MRI; HIV-2; toxoplasmosis; lymphomatoid granulomatosis ID DEFICIENCY-SYNDROME AIDS; VIRUS AB A Nigerian man had acute onset of headache and vertigo due to a cerebellar mass. A brain biopsy of the mass revealed toxoplasmosis despite repeated negative HIV-1 serology. The presence of an opportunistic infection and his country of origin raised the suspicion for HIV-2; this was confirmed by positive HIV-2 serology. Despite his preliminary pathological diagnosis, results of physiological magnetic resonance imaging (MRI) (perfusion MRI and proton magnetic resonance spectroscopy) were not typical for toxoplasmosis. The lesion showed a biochemical and perfusion pattern that was intermediate for infectious and neoplastic processes. Further neuropathology confirmed a secondary diagnosis of lymphomatoid granulomatosis. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Univ Calif Los Angeles, Harbor Med Ctr, Sch Med, Dept Neurol, Torrance, CA 90509 USA. Univ Calif Los Angeles, Harbor Med Ctr, Sch Med, Dept Pathol, Torrance, CA 90509 USA. Univ Calif Los Angeles, Harbor Med Ctr, Sch Med, Dept Med, Torrance, CA 90509 USA. Univ Calif Los Angeles, Harbor Med Ctr, Sch Med, Dept Radiol, Torrance, CA 90509 USA. RP Chang, L (reprint author), Brookhaven Natl Lab, Dept Med, Bldg 490, Upton, NY 11973 USA. RI Speck, Oliver/F-1406-2013 OI Speck, Oliver/0000-0002-6019-5597 FU NIDA NIH HHS [DA00280] NR 12 TC 3 Z9 4 U1 0 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 1051-2284 J9 J NEUROIMAGING JI J. Neuroimaging PD APR PY 2001 VL 11 IS 2 BP 212 EP 216 PG 5 WC Clinical Neurology; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA 455FT UT WOS:000170017400020 PM 11296596 ER PT J AU Ma, ZF Yang, XQ Sun, X McBreen, J AF Ma, ZF Yang, XQ Sun, X McBreen, J TI Charge-discharge characteristics and phase transitions of mixed LiNi0.8Co0.2O2 and LiMn2O4 cathode materials for lithium-ion batteries SO JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS LA English DT Article DE composite cathode; lithium ion batteries; cycle life; phase transitions ID X-RAY-DIFFRACTION; THERMAL-STABILITY; PERFORMANCE; LI-1-XNIO2 AB The charge-discharge characteristics of the composite cathode made of the mixture of LiNi0.8Co0.2O2 and LiMn2O4 was studied in a battery cell using a lithium foil as an anode. Three plateaus were observed at 3.85 V, 4.0 V and 4.2 V during charge. The operating voltage of the composite cathode is higher than the single-component cathode LiNi0.8Co0.2O2. Compared to the other single-component LiMn2O4 cathode, a smaller capacity fading was obtained for the composite cathode. The synchrotron based In situ x-ray diffraction (XRD) was used to study the phase transitions of the composite cathode during charge-discharge. In the composite cathode, the phase transitions of each component during charge-discharge can be clearly identified. These phase transitions are basically the same as observed in single-component cathode: the phase transitions from hexagonal I(HI) to hexagonal II (H2), and then to hexagonal III (H3) were observed for the component of LiNi0.8Co0.2O2, and the phase transitions from cubic I(C1) to cubic II (C2), and then to cubic III (C3) were observed for the component of LiMn2O4. However; some interesting new kinetic effects, which ave differentiation the single-component cathode, were observed. C1 Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ma, ZF (reprint author), Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China. NR 20 TC 19 Z9 21 U1 2 U2 17 PU ECOLE POLYTECHNIQUE MONTREAL PI MONTREAL PA C P 6079, SUCC CENTRE-VILLE, MONTREAL, QC H3C 3A7, CANADA SN 1480-2422 J9 J NEW MAT ELECTR SYS JI J. New Mat.Electrochem. Syst. PD APR PY 2001 VL 4 IS 2 BP 121 EP 125 PG 5 WC Electrochemistry; Materials Science, Multidisciplinary SC Electrochemistry; Materials Science GA 451LQ UT WOS:000169803900010 ER PT J AU Tischendorf, B Otaigbe, JU Wiench, JW Pruski, M Sales, BC AF Tischendorf, B Otaigbe, JU Wiench, JW Pruski, M Sales, BC TI A study of short and intermediate range order in zinc phosphate glasses SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; X-RAY-DIFFRACTION; ULTRAPHOSPHATE GLASSES; SPECTROSCOPY; POLYPHOSPHATE; STATE; RAMAN; NMR; COORDINATION; SCATTERING AB The short- and intermediate-range order of the polyphosphate glass network of the composition xZnO + (1 - x)P2O5 is invesligated, with 0.35 less than or equal to x less than or equal to 0.80. The short-range order is probed using P-31 solid-state magic angle spinning nuclear magnetic resonance (MAS NMR), liquid-state NMR and Raman spectroscopy. The results show an initial decrease in the amount of Q? sites, with an increasing number of Q(2) sites. The Q(2) sites reach a maximum concentration at the metaphosphate composition and then decrease as Q(1) and Q(0) sites become prevalent at the higher modifier contents. The intermediate-range structure of xZnO + (1 - x)P2O5 glasses is studied using double quantum MAS NMR as well as high performance liquid chromatography measurements. These measurements show that the structure changes from cross-linked rings below the metaphosphate composition to chains at and near the metaphosphate composition, and finally to dimers and isolated units at higher concentrations of the modifier. The dynamics of the intermediate-range structures are used to explain the effect of the composition on the T-g of the glass system. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Otaigbe, JU (reprint author), Iowa State Univ, Dept Mat Sci & Engn, Gilman Hall, Ames, IA 50011 USA. NR 38 TC 87 Z9 88 U1 2 U2 17 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD APR PY 2001 VL 282 IS 2-3 BP 147 EP 158 DI 10.1016/S0022-3093(01)00350-7 PG 12 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA 425UM UT WOS:000168310100001 ER PT J AU Takano, M Itoh, A Akabori, M Ogawa, T Numata, M Okamoto, H AF Takano, M Itoh, A Akabori, M Ogawa, T Numata, M Okamoto, H TI Carbothermic synthesis of (Cm,Pu)N SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10th International Symposium on Themodynamics of Nuclear Materials CY AUG 06-11, 2000 CL HALIFAX, CANADA ID (U,PU)N FUEL PELLETS; MONONITRIDE; FABRICATION; NITRIDE AB Nitrides are being considered as fuel candidates for the transmutation of minor actinides, Carbothermic reduction of oxides is an effective method to fabricate nitride fuels, In this study. (Cm-0.40,Pu-0.60)N was synthesized by the carbothermic reduction of the mixed oxide in N-2. By applying excess carbon, an oxide-free nitride was obtained at 1773 K. The lattice parameter of the oxide-free sample was 0.4948 nm, and that of the nitride with oxides was 0.4974 nm, The former value agreed well with that estimated from the literature values for CmN and PuN. The larger lattice parameter of the latter sample is considered to be due to the oxygen dissolved in the nitride. (C) 2001 Elsevier Science B,V, All rights reserved. C1 Japan Atom Energy Res Inst, Dept Mat Sci, Res Grp Actinides Sci, Tokai, Ibaraki 3191195, Japan. Japan Atom Energy Res Inst, Dept Hot Lab, Tokai, Ibaraki 3191195, Japan. RP Takano, M (reprint author), Oak Ridge Natl Lab, POB 2008,MS 6375, Oak Ridge, TN 37831 USA. NR 16 TC 10 Z9 11 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD APR PY 2001 VL 294 IS 1-2 BP 24 EP 27 DI 10.1016/S0022-3115(01)00463-9 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 425XZ UT WOS:000168318100006 ER PT J AU Byun, TS Lee, EH Hunn, JD Farrell, K Mansur, LK AF Byun, TS Lee, EH Hunn, JD Farrell, K Mansur, LK TI Characterization of plastic deformation in a disk bend test SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID FRACTURE-TOUGHNESS; BALL INDENTATION; STEELS; TRIAXIALITY; STRESS AB A disk bend test technique has been developed to study deformation mechanisms as well as mechanical properties. In the disk bend test, a transmission electron microscopy (TEM) disk size specimen of 3 mm diameter x0.25 mm thick is clamped around its rim in a circular holder and indented with a tungsten carbide ball of I mm diameter on its back face. AISI 316LN austenitic stainless steel and 9Cr-2WVTa ferritic/martensitic steel were selected as test materials. A model was developed to determine the average plastic strain and surface plastic strain in the disk bend test. The deformation regimes of the plastic strain versus deflection curves corresponded to those of the load versus deflection curves. The stress state of the disk bend deformation was analyzed for the two test materials and compared with those of other mechanical tests such as uniaxial tensile, compact tension, and ball indentation tests. Slip line features at the deformed surface and the corresponding TEM microstructures were examined for both tensile and disk bend specimens. Differences and similarities in deformation between the disk bend and the tensile tests are described. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Byun, TS (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, Bldg 5500,POB 2008,MS-6151, Oak Ridge, TN 37831 USA. NR 28 TC 10 Z9 12 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD APR PY 2001 VL 294 IS 3 BP 256 EP 266 DI 10.1016/S0022-3115(01)00484-6 PG 11 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 427BM UT WOS:000168385000005 ER PT J AU Erwin, KT Delaire, O Motta, AT Chu, YS Mancini, DC Birtcher, RC AF Erwin, KT Delaire, O Motta, AT Chu, YS Mancini, DC Birtcher, RC TI Observation of second-phase particles in bulk zirconium alloys using synchrotron radiation SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB To further advance the mechanistic understanding of microstructural evolution in zirconium alloys for high burnup applications, it is important to obtain a quantitative measurement of the volume fractions of second-phase precipitates present in the bulk alloys as a function of the heat treatment and irradiation fluence. In this work, X-ray diffraction from a synchrotron radiation source was used to identify and follow the growth kinetics of second-phase particles in zirconium alloys. The high energy flux, energy resolution and signal-to-noise ratio of this light source allowed us to study the very small (<0.2-0.4%) precipitate volume fractions in these alloys. A preliminary calculation of the precipitate volume fraction as a function of cumulative annealing parameter (CAP) showed the precipitate volume fraction increases rapidly above 10(-19) h and saturates at about 10(-17) h. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Motta, AT (reprint author), Penn State Univ, Dept Mech & Nucl Engn, 227 Reber Bldg, University Pk, PA 16802 USA. NR 5 TC 20 Z9 22 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD APR PY 2001 VL 294 IS 3 BP 299 EP 304 DI 10.1016/S0022-3115(01)00436-6 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 427BM UT WOS:000168385000009 ER PT J AU Mamontov, E Egami, T Dmowski, W Kao, CC AF Mamontov, E Egami, T Dmowski, W Kao, CC TI X-ray absorption and inelastic scattering studies of single-crystal CeO2 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE oxides; XAFS; electronic structure; defects ID CHARGE-TRANSFER EXCITATIONS; VALENCE STATE; SPECTROSCOPY; POLARIZATION; DEPENDENCE; ND2CUO4; SPECTRA AB X-ray absorption and resonant inelastic X-ray scattering measurements were performed on a single crystal of CeO2 near the Ce L-III edge at room temperature and at 873 K. At 873 K the inelastic spectrum exhibits reversible changes, which are paralleled by reversible changes in the X-ray absorption spectrum. These changes are not due to chemical reduction of the sample, and may be indicative of evolution of the structure of oxygen sublattice in CeO2 at elevated temperatures. (C) 2001 Elsevier Science Ltd. All rights reserved. C1 Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA. Univ Penn, Res Struct Matter Lab, Philadelphia, PA 19104 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Mamontov, E (reprint author), Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA. RI Mamontov, Eugene/Q-1003-2015 OI Mamontov, Eugene/0000-0002-5684-2675 NR 20 TC 5 Z9 5 U1 3 U2 9 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 APR PY 2001 VL 62 IS 4 BP 819 EP 823 DI 10.1016/S0022-3697(00)00269-9 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 411QQ UT WOS:000167511100029 ER PT J AU Choi, IH Yu, PY AF Choi, IH Yu, PY TI The band gap pressure coefficient of CuInTe2 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE chalcogenides; X-ray diffraction; optical properties ID CHALCOPYRITE SEMICONDUCTORS; DEEP CENTERS; DEPENDENCE; ABSORPTION AB The band gap pressure coefficient of CuInTe2 at room temperature has been measured to be 53 meV/GPa in contrast to the value of 22 meV/GPa reported previously by Gonzalez and Rincon (J. Phys. Chem. Solids, 51 (1990) 1093). The new coefficient is in good agreement with the theoretical value predicted by Wei et al. (Phys. Rev. B, 58 (1998) R1710). (C) 2001 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Chung Ang Univ, Dept Phys, Seoul 156756, South Korea. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Yu, PY (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. NR 7 TC 4 Z9 4 U1 0 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 APR PY 2001 VL 62 IS 4 BP 825 EP 827 DI 10.1016/S0022-3697(00)00233-X PG 3 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 411QQ UT WOS:000167511100030 ER PT J AU Burakovsky, L Preston, DL Silbar, RR AF Burakovsky, L Preston, DL Silbar, RR TI On the Bragg, Leibfried, and modified Leibfried numbers SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article ID DISLOCATION AB The Bragg, Leibfried, and modified Leibfried numbers are defined in the context of a theory of dislocation-mediated melting, and their values are determined from the properties of the dislocation ensemble at the melting temperature. The approximate numerical coincidence of the Bragg and modified Leibfried numbers is explained. The parameter K in the definition of the modified Leibfried number is shown to be the natural logarithm of the effective coordination number. Our analysis reveals that the Bragg number can be considered an elemental constant, in contrast to the Leibfried and modified Leibfried numbers. (C) 2001 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. WhistleSoft Inc, Los Alamos, NM 87544 USA. RP Burakovsky, L (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, T-16,MS B 283, Los Alamos, NM 87545 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 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 APR PY 2001 VL 62 IS 4 BP 829 EP 831 DI 10.1016/S0022-3697(00)00250-X PG 3 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 411QQ UT WOS:000167511100031 ER PT J AU Barkigia, KM Renner, MW Fajer, J AF Barkigia, KM Renner, MW Fajer, J TI Molecular structure of Fe(III) 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrin perchlorate: a saddle-shaped porphyrin with an intermediate S=3/2 spin state SO JOURNAL OF PORPHYRINS AND PHTHALOCYANINES LA English DT Article DE nonplanar porphyrin; iron(III); intermediate spin state; crystal structure; electron paramagnetic resonance ID NONPLANAR PORPHYRINS; IRON(III) PORPHYRINS; CRYSTAL-STRUCTURE; CYTOCHROME C'; MODEL; RING AB Recent crystallographic evidence of nonplanarity of several prosthetic groups in heme proteins has prompted the design of conformationally distorted synthetic porphyrins in order to assess the consequences of the nonplanarity observed in vivo. The crystal structure of the sterically crowded Fe(III) 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrin perchlorate has been determined and shows the macrocycle to be saddle-shaped with a small degree of ruffling. The combination of severe nonplanarity and of the weak ligand-field counterion results in a nearly pure S = 3/2 intermediate spin state of the Fe(III) as evidenced by its electron paramagnetic resonance spectrum in frozen solution at low temperatures. Published in 2001 by John Wiley & Sons, Ltd. C1 Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA. RP Fajer, J (reprint author), Brookhaven Natl Lab, Energy Sci & Technol Dept, Bldg 555, Upton, NY 11973 USA. NR 20 TC 32 Z9 32 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1088-4246 J9 J PORPHYR PHTHALOCYA JI J. Porphyr. Phthalocyanines PD APR PY 2001 VL 5 IS 4 BP 415 EP 418 DI 10.1002/jpp.342 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA 418FD UT WOS:000167879500007 ER PT J AU Ye, KQ Hamada, M Wu, CFJ AF Ye, KQ Hamada, M Wu, CFJ TI A step-down Lenth method for analyzing unreplicated factorial designs SO JOURNAL OF QUALITY TECHNOLOGY LA English DT Article DE experimentwise error rate; individual error rate; power AB Unreplicated factorial designs are frequently used in industrial experiments. A commonly used method to identify active effects from such experiments is the half-normal plot. Many formal testing methods have been developed to overcome the subjectivity of using this graphical method. Among them, the Lenth (1989) method is simple, yet powerful, as shown by Hamada and Balakrishnan (1998). In this paper, we propose a step-down version of the Lenth method. It is compared via simulation with the original Lenth method and with stepwise methods proposed by Venter and Steel (1998). It is shown that the step-down Lenth method is better than the original Lenth method and the Venter and Steel step-down method. The Venter and Steel step-up method controlled by the same experimentwise error rate has more power, but it also has a higher individual error rate. Critical values used in the step-down Lenth method are provided. C1 SUNY Stony Brook, Dept Appl Math & Stat, Stony Brook, NY 11794 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Michigan, Dept Stat, Ann Arbor, MI 48109 USA. Univ Michigan, Dept Ind & Operat Engn, Ann Arbor, MI 48109 USA. RP Ye, KQ (reprint author), SUNY Stony Brook, Dept Appl Math & Stat, Stony Brook, NY 11794 USA. NR 11 TC 23 Z9 29 U1 0 U2 0 PU AMER SOC QUALITY CONTROL-ASQC PI MILWAUKEE PA ASQC MEMBERSHIP MANAGER 611 E. WISCONSIN AVENUE, MILWAUKEE, WI 53202 USA SN 0022-4065 J9 J QUAL TECHNOL JI J. Qual. Technol. PD APR PY 2001 VL 33 IS 2 BP 140 EP 152 PG 13 WC Engineering, Industrial; Operations Research & Management Science; Statistics & Probability SC Engineering; Operations Research & Management Science; Mathematics GA 418NG UT WOS:000167897800004 ER PT J AU Holmes, LL Harbottle, G AF Holmes, LL Harbottle, G TI Old stones, new science SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID SCULPTURE AB Museum collections include many French medieval limestone sculptures of unknown origin. To localize the source of their stone, the composition of samples from such sculptures has been determined by neutron activation analysis (INAA). Using multivariate statistics, we compared their compositional profiles with groups of samples from French monuments and from quarries known to medieval craftsmen. This process has suggested a provenance for some sculptures and allowed us to assign others to a region or a quarry that provided stone for their production. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11937 USA. RP Holmes, LL (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 13 TC 4 Z9 4 U1 1 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD APR PY 2001 VL 248 IS 1 BP 75 EP 79 DI 10.1023/A:1010626024391 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 423XU UT WOS:000168203700011 ER PT J AU Morton, JS Woolf, SA McIntyre, TI AF Morton, JS Woolf, SA McIntyre, TI TI Radionuclide traceability for US Department of Energy Environmental Management Radioanalytical Services SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB In 1999, the Department of Energy Office of Environmental Management (DOE-EM) National Analytical Management Program (NAMP) established a Radiological Traceability Program (RTP) as a new initiative for the radioanalytical acitivies related to the environmental programs conducted throughout the DOE complex. The National Analytical Management Program entered into an interagency agreement with the National Institute of Standards and Technology (NIST) to establish traceability to the national standard for DOE-EM radioanatytical. activities through the NIST/reference laboratory concept as described in ANSI N42.23-1996.(1) Using the criteria established by the RTP, NAMP named two DOE-EM laboratories as reference or secondary laboratories and established a program with NIST that demonstrated the concept of traceability. In order to gain and maintain traceability to NIST, each reference laboratory must meet the performance criteria as defined by the RTP and NAMP. Traceability to NIST is tiered down to each radioanalytical laboratory (monitor or service) that successfully participates in the performance-evaluation programs offered by the reference laboratories. Essential to the RTP is the demonstration that the reference laboratories can produce performance-testing (PT) materials of high quality as well as analyze/verify the radionuclide concentration to the required accuracy and precision. This paper presents the elements of the RTP and the program requirements of NIST and the reference laboratories. C1 US DOE, Natl Anal Management Program, Idaho Falls, ID 83402 USA. US DOE, Idaho Falls, ID 83402 USA. Sci Applicat Int Corp, Gaithersburg, MD 20878 USA. RP US DOE, Natl Anal Management Program, 850 Energy Dr, Idaho Falls, ID 83402 USA. EM mortonjs@id.doe.gov NR 7 TC 3 Z9 3 U1 0 U2 1 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 EI 1588-2780 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD APR PY 2001 VL 248 IS 1 BP 175 EP 177 DI 10.1023/A:1010619317547 PG 3 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 423XU UT WOS:000168203700028 ER PT J AU Berne, A AF Berne, A TI Comparison of the uncertainties calculated for the results of radiochemical determinations using the law of propagation of uncertainty and a Monte Carlo simulation SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Quantitative determinations of many radioactive analytes in environmental samples are based on a process in which several independent measurements of different properties are taken. The final results that are calculated using the data have to be evaluated for accuracy and precision. The estimate of the standard deviation, s, also called the combined standard uncertainty (CSU) associated with the result of this combined measurement can be used to evaluate the precision of the result. The CSU can be calculated by applying the law of propagation of uncertainty, which is based on the Taylor series expansion of the equation used to calculate the analytical result. The estimate of s can also be obtained from a Monte Carlo simulation. The data used in this simulation includes the values resulting from the individual measurements, the estimate of the variance of each value, including the type of distribution, and the equation used to calculate the analytical result. A comparison is made between these two methods of estimating the uncertainty of the calculated result. C1 US Dept Energy, Environm Measurements Lab, New York, NY 10014 USA. RP Berne, A (reprint author), US Dept Energy, Environm Measurements Lab, 201 Varick St, New York, NY 10014 USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD APR PY 2001 VL 248 IS 1 BP 179 EP 183 DI 10.1023/A:1010671301618 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 423XU UT WOS:000168203700029 ER PT J AU Inn, KGW Lin, ZC Wu, ZY McMahon, C Filliben, JJ Krey, P Feiner, M Liu, CK Holloway, R Harvey, J Larsen, IL Beasley, T Huh, CA Morton, S McCurdy, D Germain, P Handl, J Yamamoto, M Warren, B Bates, TH Holms, A Harvey, BR Popplewell, DS Woods, MJ Jerome, S Odell, KJ Young, P Croudace, I AF Inn, KGW Lin, ZC Wu, ZY McMahon, C Filliben, JJ Krey, P Feiner, M Liu, CK Holloway, R Harvey, J Larsen, IL Beasley, T Huh, CA Morton, S McCurdy, D Germain, P Handl, J Yamamoto, M Warren, B Bates, TH Holms, A Harvey, BR Popplewell, DS Woods, MJ Jerome, S Odell, KJ Young, P Croudace, I TI The NIST natural-matrix radionuclide standard reference material program for ocean studies SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB In 1977, the Low-level Working Group of the International Committee on Radionuclide Metrology met in Boston. MA (USA) to define the characteristics of a new set of environmental radioactivity reference materials. These reference materials were to provide the radiochemist with the same analytical challenges faced when assaying environmental samples. It was decided that radionuclide bearing natural materials should be collected from sites where there had been sufficient time for natural processes to redistribute the various chemically different species of the radionuclides. Over the succeeding years, the National Institute of Standards and Technology (NIST), in cooperation with other highly experienced laboratories, certified and issued a number of these as low-level radioactivity Standard Reference Materials (SRMs) for fission and activation product and actinide concentrations. The experience of certifying these SRMs has given NIST the opportunity to compare radioanalytical methods and learn of their limitations. NIST convened an international workshop in 1994 to define the natural-matrix radionuclide SRM needs for ocean studies. The highest priorities proposed at the workshop were for sediment, shellfish, seaweed, fish flesh and water matrix SRMs certified for mBq per sample concentrations of Sr-90, Cs-137 and Pu-239 + Pu-240. The most recent low-level environmental radionuclide SRM issued by NIST, Ocean Sediment (SRM 4357) has certified and uncertified values for the following 22 radionuclides: K-40 Sr-90, I-129, Cs-137, Eu-155, Pb-210, Po-210, Pb-212, Bi-214, Ra-226 Ra-228 Th-228, Th-230, Th-232, U-234, U-235, Np-237, U-238, Pu-238(,) Pu-239, + Pu-240, and Am-241. The uncertainties for a number of the certified radionuclides are non-symmetrical and relatively large because of the non-normal distribution of reported values. NIST is continuing its efforts to provide the ocean studies community with additional natural matrix radionuclide SRMs. The freeze-dried shellfish flesh matrix has been prepared and recently sent to participating laboratories for analysis and we anticipate receiving radioanalytical results in 2000. The research and development work at NIST produce well characterized SRMs that provide the world's environment-studies community with an important foundation component for radionuclide metrology. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. US Dept Energy, Environm Measurements Lab, New York, NY USA. US EPA, Las Vegas, NV 89193 USA. Int Technol Corp, Ridge, TN USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Oregon State Univ, Newport, OR 97365 USA. USDOE, Radiol & Environm Sci Lab, Idaho Falls, ID USA. Ctr Etud Nucl, Lab Radioecol Marine, Fontenay Aux Roses, France. Niedersachs Inst Radiookol, Hannover, Germany. Kanazawa Univ, Kanazawa, Ishikawa 920, Japan. Atom Weapons Estab, Aldermaston, England. British Nucl Fuels Plc, Sellafield, England. Lab Govt Chemist, Teddington TW11 0LY, Middx, England. Minist Agr Fisheries & Food, Lowestoft, Suffolk, England. Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. Natl Phys Lab, Teddington TW11 0LW, Middx, England. Nucl Elect, Gravesend, England. S Scotland Elect Board, Hunterston, Scotland. Southhampton Oceanog Ctr, Southampton, Hants, England. RP Inn, KGW (reprint author), Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. RI Huh, Chih-An/N-4610-2013; OI Croudace, Ian/0000-0003-1547-5650 NR 7 TC 10 Z9 11 U1 0 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD APR PY 2001 VL 248 IS 1 BP 227 EP 231 DI 10.1023/A:1010635705252 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 423XU UT WOS:000168203700036 ER PT J AU LaMont, SP Gehrke, RJ Glover, SE Filby, RH AF LaMont, SP Gehrke, RJ Glover, SE Filby, RH TI Precise determination of the intensity of Ra-226 alpha decay to the 186 keV excited state SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID PHOTON-EMISSION PROBABILITIES; ACTINIDE NUCLIDES; DAUGHTER PRODUCTS; SPECTROMETRY; EQUILIBRIUM; PARTICLE; SAMPLES AB There is a significant discrepancy in the reported values for the emission probability of the 186 keV gamma-ray resulting from the alpha decay of Ra-226 to 186 keV excited state of Rn-222. Published values fall in the range of 3.25 to 3.59 gamma-rays per 100 alpha-decays. An interesting observation is that the lower value, 3.28, is based on measuring the 186 keV gamma-ray intensity relative to the Ra-226 alpha-branch to the 186 keV level. The higher values, which are close to 3.59, are based on measuring the gamma-ray intensity from mass standards of Ra-226 that are traceable to the mass standards prepared by HCiNIGSCHIVm3 in the early 1930's. This discrepancy was resolved in this work by carefully measuring the Ra-226 alpha-branch intensities, then applying the theoretical E2 multipolarity internal conversion coefficient of 0.692 +/-0.007 to calculate the 186 keV gamma-ray emission probability. The measured value for the alpha branch to the 186 keV excited state was (6.16 +/-0.03)%, which gives a 186 keV gamma-ray emission probability of(3.64 +/-0.04)%. This value is in excellent agreement with the most recently reported 186 keV gamma-ray emission probabilities determined using Ra-226 mass standards. C1 Washington State Univ, Dept Chem, Pullman, WA 99164 USA. Bechtel BWXT Idaho, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. Univ Pittsburgh, Dept Environm & Occupat Hlth, Pittsburgh, PA 15238 USA. RP LaMont, SP (reprint author), Washington State Univ, Dept Chem, POB 644630, Pullman, WA 99164 USA. NR 23 TC 2 Z9 2 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD APR PY 2001 VL 248 IS 1 BP 247 EP 253 DI 10.1023/A:1010696007069 PG 7 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 423XU UT WOS:000168203700039 ER PT J AU Moshopoulou, EG Fisk, Z Sarrao, JL Thompson, JD AF Moshopoulou, EG Fisk, Z Sarrao, JL Thompson, JD TI Crystal growth and intergrowth structure of the new heavy fermion materials CeIrIn5 and CeRhIn5 SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE heavy fermion; lattice dimensionality; diffraction; intergrowth structure; homologous series ID X-RAY; BEHAVIOR; PARAMETERS; PRESSURE AB The structures of the new heavy fermion materials CeIrIn5 and CeRhIn5 have been determined by single-crystal neutron (R(F) = 0.051) and X-ray (R(F) = 0.056) diffraction, respectively. Both compounds adopt tetragonal structure, space group P4/mmm (No, 123), Z = 1, a = b = 4.674(1) Angstrom, and c = 7.501(5) Angstrom for CeIrIn5, and a = b = 4.656(2) Angstrom, and c = 7.542(1) Angstrom for CeRhIn5. The possible presence of antisite disorder, a long-standing question on this type of structure, was excluded by both electron and neutron or X-ray diffraction, The compounds are built by monolayers of face-sharing distorted cuboctahedra [CeIn3] and monolayers of edge-sharing rectangular parallelepipeds [RhIn2] or [IrIn2], stacked alternatively in the [001] direction. Therefore, they are new members of the inhomogeneous linear homologous series MmTnT3m+2n'. Because of their ordered intergrowth structure, the physical properties of the quasi-two-dimensional heavy electron systems CeIrIn5 and CeRhIn5 can be directly compared with the corresponding ones of their parent compound, the three-dimensional heavy fermion material CeIn3, (C) 2001 Academic Press. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM evagelia@ims.demokritos.gr NR 49 TC 104 Z9 104 U1 3 U2 22 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 EI 1095-726X J9 J SOLID STATE CHEM JI J. Solid State Chem. PD APR PY 2001 VL 158 IS 1 BP 25 EP 33 DI 10.1006/jssc.2000.9052 PG 9 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 428BP UT WOS:000168441500003 ER PT J AU Teller, E AF Teller, E TI Remarks about the Jahn-Teller effect SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 1st International Conference on Induced Cooperative Phenomena CY JUN 24-28, 2000 CL BERKELEY, CALIFORNIA DE Jahn-Teller effect AB Under special circumstances, it may be possible to observe an unusual phenomenon: a superconducting state which exists only at high temeratures. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Teller, E (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 0 TC 3 Z9 3 U1 3 U2 4 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 2001 VL 14 IS 2 BP 299 EP 299 DI 10.1023/A:1007832606833 PG 1 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 453RT UT WOS:000169930800014 ER PT J AU Kresin, VZ Ovchinnikov, YN Wolf, SA AF Kresin, VZ Ovchinnikov, YN Wolf, SA TI Intrinsic inhomogeneity: Application to the high T-c oxides SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 1st International Conference on Induced Cooperative Phenomena CY JUN 24-28, 2000 CL BERKELEY, CALIFORNIA DE inhomogeneity; pseudogap; percolation ID CHARGE INHOMOGENEITIES; NEUTRON-DIFFRACTION; NORMAL-STATE; YBA2CU3O6+X; PSEUDOGAP; BI2SR2CACU2O8+DELTA; PERCOLATION; MANGANITES; CRYSTALS; PLANES AB Inhomogeneity of the doped compound leads to a possibility of observing a peculiar state that is characterized by normal resistance along with superconducting gap structure and diamagnetism. Such pseudogap state is observed in the high-T-c cuprates. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Russian Acad Sci, Landau Inst Theoret Phys, Moscow 11733V, Russia. USN, Res Lab, Washington, DC 20375 USA. RP Kresin, VZ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Wolf, Stuart/A-7513-2009 NR 37 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 2001 VL 14 IS 2 BP 301 EP 304 DI 10.1023/A:1007884623671 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 453RT UT WOS:000169930800015 ER PT J AU Fremgen, DE Smotkin, ES Gerald, RE Klingler, RJ Rathke, JW AF Fremgen, DE Smotkin, ES Gerald, RE Klingler, RJ Rathke, JW TI Microemulsions of water in supercritical carbon dioxide: an in-situ NMR investigation of micelle formation and structure SO JOURNAL OF SUPERCRITICAL FLUIDS LA English DT Article DE microemulsion; spontaneous formation; supercritical carbon dioxide; toroid cavity; NMR imaging; nuclear overhauser effect ID ORGANIC-SYNTHESIS; PROTEINS AB High-pressure NMR spectroscopy was used for the first time to investigate microemulsions of water in supercritical carbon dioxide. The emulsions were formed using a family of anionic perfluoropolyether ammonium carboxylate surfactants. This system holds promise as a reaction medium for conducting homogeneous catalytic reactions within the aqueous micellular cores while, at the same time, exploiting the facile mass transfer properties of the supercritical fluid. Ammonium hexafluorophosphate was used as a water-soluble ionic guest to investigate micelle formation and structure. Under micelle-forming conditions, the PF6- guest, surfactant, and water were uniformly dispersed throughout the CO2 phase, as demonstrated by in situ NMR imaging. In addition, the micelles were observed to form even in the absence of mechanical stirring. This spontaneous formation of micelles demonstrates that the NMR spectral properties were obtained under conditions that result in the production of thermodynamically stable microemulsions. The nuclear overhauser effect (NOE) was used to probe the micellular structure through dipole-dipole interactions between the PF6- anion and the fluorinated backbone of the surfactant. A strong negative homonuclear NOE was observed between the PF6- guest and the fluorine moiety that is located directly adjacent to the surfactant's carboxylate head group. This highly specific negative NOE indicates an ordered arrangement, where the PF6- anion and carboxylate ion are located in close proximity to one another. This close association of two negatively charged ionic groups in an aqueous environment is unusual and suggests that the PF6- guest is concentrated within the electric double layer that forms at the micellular interface. (C) 2001 Elsevier Science B.V. Ltd. All rights reserved. C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. IIT, Dept Chem, Chicago, IL 60616 USA. RP Klingler, RJ (reprint author), Argonne Natl Lab, Div Chem Technol, 9700 Cass Ave, Argonne, IL 60439 USA. NR 19 TC 37 Z9 37 U1 2 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0896-8446 J9 J SUPERCRIT FLUID JI J. Supercrit. Fluids PD APR PY 2001 VL 19 IS 3 BP 287 EP 298 DI 10.1016/S0896-8446(00)00098-X PG 12 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 421UF UT WOS:000168081400006 ER PT J AU Hansen, ADA Lowenthal, DH Chow, JC Watson, JG AF Hansen, ADA Lowenthal, DH Chow, JC Watson, JG TI Black carbon aerosol at McMurdo station, Antarctica SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID REAL-TIME MEASUREMENT; SOUTH-POLE; MAUNA-LOA; ABSORPTION; PARTICLES; SOOT AB Aerosol light absorption as black carbon (BC) was measured from November 19, 1995, to February 6, 1996, at a location 0.65 km downwind of the center of McMurdo Station on the Antarctic coast. The results show a bimodal frequency distribution of BC concentrations. Approximately 65% of the measurements were found in a mode at a low range of concentrations centered at similar to 20 ng/m(3). These concentrations are higher than those found at other remote Antarctic locations and probably represent contamination from the station. The remaining measurements were in a high-concentration mode (BC similar to 300 ng/m(3)), indicating direct impact of local emissions from combustion activities at the station. High values of BC were associated with winds from the direction of the station, and the BC flux showed a clear directionality. Maximum BC concentrations occurred between 7:00 and 11:00 a.m. The "polluted" mode accounted for more than 80% of the BC frequency-weighted impact at this location. C1 Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Engn, Berkeley, CA 94720 USA. RP Lowenthal, DH (reprint author), Desert Res Inst, Div Atmospher Sci, 2215 Raggio Pkwy, Reno, NV 89512 USA. RI Watson, John/E-6869-2010 OI Watson, John/0000-0002-1752-6899 NR 19 TC 9 Z9 17 U1 0 U2 3 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 APR PY 2001 VL 51 IS 4 BP 593 EP 600 PG 8 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 419HQ UT WOS:000167943600012 PM 11321916 ER PT J AU Zhang, XF Sixta, ME De Jonghe, LC AF Zhang, XF Sixta, ME De Jonghe, LC TI Secondary phases in hot-pressed aluminum-boron-carbon-silicon carbide SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID ADDITIONS; BEHAVIOR; FATIGUE; GROWTH; AL; TRANSFORMATION; RESISTANCE; TOUGHNESS; STRENGTH AB Silicon carbide hot-pressed with aluminum, boron, and carbon as sintering aids (ABC-SiC), was studied by transmission electron microscopy, Both grain-boundary films and inclusions were prevalent in this material. The present study characterized the inclusions located in triple-junctions, grain boundaries, and the interior of the SiC grains, with emphases on phases not scrutinized before. These inclusions were crystalline, in contrast to the amorphous grain-boundary films. Two dominant types of boron-free triple-junction phases containing Al(Si)-O-C-(S) and Al(Si)-O were identified, where sulfur was an unexpected contaminant, and silicon came from SiO2 or from dissolution of SiC. Boron-containing inclusions with a composition Al-O-B-C were frequently observed inside SLC grains. Although the boron-free aluminum-rich phases wet the grain boundaries completely and are, therefore, effective sintering additives, the boron-containing AI(SI)-O-B-C did not wet the grain boundaries. The structure and chemical composition of these boron-containing intragranular inclusions were determined, and their mechanism of formation is discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. RP Zhang, XF (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 28 TC 10 Z9 10 U1 2 U2 6 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 2001 VL 84 IS 4 BP 813 EP 820 DI 10.1111/j.1151-2916.2001.tb00746.x PG 8 WC Materials Science, Ceramics SC Materials Science GA 421BM UT WOS:000168042300020 ER PT J AU Lewinsohn, CA Henager, CH Jones, RH Eldridge, JI AF Lewinsohn, CA Henager, CH Jones, RH Eldridge, JI TI Measuring interphase recession by fiber push-in testing SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID CERAMIC-MATRIX COMPOSITES; INTERMEDIATE TEMPERATURES; STRESS-RUPTURE; OXIDATION; CRACKING; MECHANISMS; INTERFACE; KINETICS; CFCCS AB A novel technique for measuring interphase recession in ceramic-matrix composites (CMCs) due to oxidation is described, The technique involves fiber push-in testing and analysis of the load-displacement curves. Fiber push-in tests were conducted on carbon-coated Hi-Nicalon SiC fibers in a CVI SiC matrix, where the carbon interphase had recessed due to oxidation, Estimates of interphase recession distances from analysis of fiber push-in tests are in reasonable agreement with measurements made by optical microscopy, Besides measuring the recession distance, the fiber push-in test can be used to investigate environmental effects on fiber bridging. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. NASA, Glenn Res Ctr, Cleveland, OH 44135 USA. RP Lewinsohn, CA (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. OI Henager, Chuck/0000-0002-8600-6803 NR 29 TC 5 Z9 5 U1 1 U2 8 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 2001 VL 84 IS 4 BP 866 EP 868 DI 10.1111/j.1151-2916.2001.tb00754.x PG 3 WC Materials Science, Ceramics SC Materials Science GA 421BM UT WOS:000168042300028 ER PT J AU Tuttle, BA Smay, JE Cesarano, J Voigt, JA Scofield, TW Olson, WR Lewis, JA AF Tuttle, BA Smay, JE Cesarano, J Voigt, JA Scofield, TW Olson, WR Lewis, JA TI Robocast Pb(Zr0.95Ti0.05)O-3 ceramic monoliths and composites SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article; Proceedings Paper CT 102nd Annual Meeting of the American-Ceramic-Society CY MAY 02, 2000 CL ST LOUIS, MISSOURI SP Amer Ceram Soc ID LEAD-ZIRCONATE-TITANATE AB Robocasting, which is a computer-controlled slurry-deposition technique, was used to fabricate ceramic monoliths and composites of chemically prepared Pb(Zr0.95Ti0.05)O-3 ceramics. The densities and electrical properties of the robocast samples were equivalent to those obtained for cold isostatically pressed parts formed under a pressure of 200 MPa, Three-layer robocast composites that consisted of alternating layers of different sintered densities- 93.9%/96.1 %/93,9%-were fabricated using different levels of organic pore-former additions. Modification from a single-material to a multiple-material deposition robocaster was essential for the fabrication of composites that could withstand repeated cycles of saturated polarization switching under fields of 30 kV/cm, Furthermore, these composites withstood a poled ferroelectric-to-antiferroelectric phase transformation that was induced by a hydrostatic pressure of 500 MPa, during which strain differences on the order of 0.8% occurred between the composite elements. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Illinois, Urbana, IL 61801 USA. RP Tuttle, BA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 11 TC 26 Z9 27 U1 3 U2 18 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 2001 VL 84 IS 4 BP 872 EP 874 DI 10.1111/j.1151-2916.2001.tb00756.x PG 3 WC Materials Science, Ceramics SC Materials Science GA 421BM UT WOS:000168042300030 ER PT J AU Acree, CW Peyran, RJ Johnson, W AF Acree, CW Peyran, RJ Johnson, W TI Rotor design options for improving tiltrotor whirl-flutter stability margins SO JOURNAL OF THE AMERICAN HELICOPTER SOCIETY LA English DT Article AB Rotor design changes intended to improve tiltrotor whirl-flutter stability margins were analyzed. A baseline analytical model similar to the XV-15 (23% thick wing) was established, and then a 15% thick wing was designed to be representative of a high-speed tiltrotor. While the thinner wing has lower drag, it also has lower stiffness, reducing whirl-flutter stability. The rotor blade design was modified to increase the stability speed margin for the thin-wing design. Small rearward offsets of the aerodynamic-center locus with respect to the blade elastic axis created. large increases in the stability boundary. The effect was strongest for offsets at the outboard part of the blade, where an offset of the aerodynamic center by 10% of tip chord improved the stability margin by over 100 knots. Forward offsets of the blade center of gravity had similar but less pronounced effects. Equivalent results were seen for swept-tip blades. Combinations of tip sweep, control-system stiffness, and delta-three were also investigated. A limited investigation of blade loads in helicopter and airplane configuration indicated that proper choice of parametric variations can avoid excessive increases in rotor loads. C1 NASA, Ames Res Ctr, Ames, IA USA. USA, Aeroflightdynam Directorate, Washington, DC 20310 USA. RP Acree, CW (reprint author), NASA, Ames Res Ctr, Ames, IA USA. NR 17 TC 2 Z9 3 U1 1 U2 1 PU AMER HELICOPTER SOC INC PI ALEXANDRIA PA 217 N WASHINGTON ST, ALEXANDRIA, VA 22314 USA SN 0002-8711 J9 J AM HELICOPTER SOC JI J. Am. Helicopter Soc. PD APR PY 2001 VL 46 IS 2 BP 87 EP 95 PG 9 WC Engineering, Aerospace SC Engineering GA 466UR UT WOS:000170665000001 ER PT J AU Ji, HF Dabestani, R Brown, GM Hettich, RL AF Ji, HF Dabestani, R Brown, GM Hettich, RL TI Synthesis and sensing behavior of cyanoanthracene modified 1,3-alternate calix[4]benzocrown-6: a new class of Cs+ selective optical sensors SO JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 LA English DT Article ID SUPPORTED LIQUID MEMBRANES; FIELD-EFFECT TRANSISTORS; ALKALI-METAL IONS; FLUORESCENT-PROBE; CESIUM; COMPLEXATION; BINDING; CALIX<4>ARENES; CALIXCROWNS; POTASSIUM AB 1,3-Calix[4]bis (10-cyano-9-anthrylmethyl-o-benzocrown-6) AnCN2, and 1,3-calix[4]-25,27-bis(allyloxy)-26,28-(10-cyano-9-anthrylmethyl-o-benzocrown-6), AnCN1, were synthesized as the first generation of Cs+ selective optical sensors based on calixarenes. The maximum enhancement in the emission of AnCN2 and AnCN1 upon Cs' complexation was 11.7 and 8.2 in a 1 : 1 CH2Cl2-MeOH mixture. Their response to Various alkali metal ions follows the order Cs+ > Rb+ >> K+ >> Na+ > Li+ indicating good selectivity towards caesium. The fluorescence and absorption profile for CS' complexation suggest a 1 : 1 stoichiometry for the host AnCN1-Cs complex and a stability constant of 10(7) M-1. AnCN2, on the other hand, shows two plateau regions corresponding to a 1 : 2 stoichiometry for complexation of Cs'. The first complexation constant is much higher (10(7) M-1) than the second one (10(4) M-1). The NMR studies further substantiate the complexation of two metal ions by AnCN2. This is the first report of stepwise complexation of metal ions to a 1,3-alternate calix[4]bis(crown-6) derivative. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Dabestani, R (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, POB 2008,MS-6100, Oak Ridge, TN 37831 USA. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 29 TC 43 Z9 44 U1 1 U2 10 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD,, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1472-779X J9 J CHEM SOC PERK T 2 JI J. Chem. Soc.-Perkin Trans. 2 PD APR PY 2001 IS 4 BP 585 EP 591 DI 10.1039/b007507h PG 7 WC Chemistry, Organic; Chemistry, Physical SC Chemistry GA 422NA UT WOS:000168123900026 ER PT J AU Giacomini, MT Ticianelli, EA McBreen, J Salasubramanian, M AF Giacomini, MT Ticianelli, EA McBreen, J Salasubramanian, M TI Oxygen reduction on supported platinum/polythiophene electrocatalysts SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ROTATING PLATINUM-ELECTRODES; POLYPYRROLE FILMS; AQUEOUS-SOLUTIONS; ACID; POLYTHIOPHENE; ELECTROPOLYMERIZATION; THIOPHENE; OXIDATION; METHANOL AB This work reports the use of polythiophene films as supporting matrix for Pt particles. The polymer film hosts were prepared using a strong acid aqueous solution, impregnated with Pt particles, and then tested for electrocatalytic properties for the oxygen reduction reaction (ORR). Cyclic voltammetry shows that the redox behavior of polythiophene in 12.5 M H2SO4 presents a general feature equivalent to that of several other conducting polymers, especially polypyrrole. Features of the W-visible spectra obtained during the redox process are consistent with the polaron/bipolaron model. Scanning electron microscopy measurements show that a very homogeneous film layer is obtained with the Pt deposited as very fine particles. Polarization measurements have shown that the ORR occurs through a mechanism involving four electrons with Tafel slopes of ca. 0.12 V dec(-1) for potentials below 0.85 V vs. RHE (reference hydrogen electrode), in agreement with previous results for other types of dispersed Pt electrocatalysts. (C) 2001 The Electrochemical Society. All rights reserved. C1 USP, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, Brazil. Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. RP Giacomini, MT (reprint author), USP, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, Brazil. RI Ticianelli, Edson/D-1560-2012 OI Ticianelli, Edson/0000-0003-3432-2799 NR 25 TC 31 Z9 31 U1 1 U2 17 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD APR PY 2001 VL 148 IS 4 BP A323 EP A329 DI 10.1149/1.1354610 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 420MF UT WOS:000168008200007 ER PT J AU Simner, SP Hardy, JS Stevenson, JW AF Simner, SP Hardy, JS Stevenson, JW TI Sintering and properties of mixed lanthanide chromites SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTRICAL-PROPERTIES AB A variety of strontium-doped lanthanide chromite compositions were synthesized from a mixed lanthanide (Ln) precursor predominantly consisting of La, Nd, Ce, and Pr. Samples were initially analyzed to assess their sintering characteristics. The most promising sintering behavior was observed for samples of the general formula Ln(0.85)Sr(0.15)Cr(1-z)M(z)O(3), where M=transition metal elements Co, Cu, Ni, and V, and 0.02 less than or equal to z less than or equal to 0.1. For most compositions >90% theoretical density was attained at 1450 degreesC, though a 5 mol % Cu-doped compound could be sintered to high density as low as 1250 degreesC. High density samples were subsequently analyzed with respect to phase stability, thermal expansion, electrical conductivity in air and reducing atmospheres, and dilation at low oxygen partial pressures. Virtually all samples indicated an orthorhombic- to rhombohedral-phase transformation between 750 and 850 degreesC, and nonlinear Arrhenius electrical conductivity behavior with a positive inflection around 650 degreesC indicative of increased carrier concentrations. Both phenomena are related to the influence of the additional A site cations (in particular Ce in the case of increased conductivity at elevated temperatures). Ln(0.85)Sr(0.15)Cr(0.95)Cu(0.05)O(3) was the only sample that exhibited linear conductivity behavior and no discernible structure transformation, thought to be related to the precipitation of a Ce0.5Nd0.5O1.75 second phase. (C) 2001 The Electrochemical Society. All rights reserved. C1 Pacific NW Natl Lab, Mat Resource Dept, Richland, WA 99352 USA. RP Simner, SP (reprint author), Pacific NW Natl Lab, Mat Resource Dept, Richland, WA 99352 USA. RI Hardy, John/E-1938-2016 OI Hardy, John/0000-0002-1699-3196 NR 16 TC 9 Z9 9 U1 1 U2 6 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD APR PY 2001 VL 148 IS 4 BP A351 EP A360 DI 10.1149/1.1355685 PG 10 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 420MF UT WOS:000168008200011 ER PT J AU Hughes, RC Yelton, WG Pfeifer, KB Patel, SV AF Hughes, RC Yelton, WG Pfeifer, KB Patel, SV TI Characteristics and mechanisms in ion-conducting polymer films as chemical sensors SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTROLYTE; IMPEDANCE AB Solid polymer electrolytes are widely used in batteries and fuel cells because of the high ionic conductivity that can be achieved at room temperature. The ions are usually Li or protons, although other ions can be shown to conduct in these polymer films. There has been very little published work on solid polymer electrolyte films used as chemical sensors. We have found that thin films of polymers like polyethylene oxide (PEO) are very sensitive to low concentrations of volatile organic compounds (VOCs) such as common solvents. Evidence of a new sensing mechanism involving the percolation of ions through narrow channels of amorphous polymer is presented. We will present impedance spectroscopy of PEO films in the frequency range 0.0001 Hz to 1 MHz for different concentrations of VOCs and relative humidity. We find that the measurement frequency is important for distinguishing ionic conductivity from the double layer capacitance and the parasitic capacitance. (C) 2001 The Electrochemical Society. C1 Sandia Natl Labs, Microsensor Dept, Albuquerque, NM 87185 USA. RP Hughes, RC (reprint author), Sandia Natl Labs, Microsensor Dept, POB 5800, Albuquerque, NM 87185 USA. RI Patel, Sanjay/D-2903-2014 OI Patel, Sanjay/0000-0001-9540-9957 NR 19 TC 12 Z9 12 U1 1 U2 3 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD APR PY 2001 VL 148 IS 4 BP H37 EP H44 DI 10.1149/1.1354604 PG 8 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 420MF UT WOS:000168008200063 ER PT J AU Chen, Q Gruen, DM Krauss, AR Corrigan, TD Witek, M Swain, GM AF Chen, Q Gruen, DM Krauss, AR Corrigan, TD Witek, M Swain, GM TI The structure and electrochemical behavior of nitrogen-containing nanocrystalline diamond films deposited from CH4/N-2/Ar mixtures (vol 148, pg E44, 2001) SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Correction C1 Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Utah State Univ, Dept Chem & Biochem, Logan, UT 84322 USA. Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. RP Chen, Q (reprint author), Argonne Natl Lab, Div Sci Mat, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 1 TC 3 Z9 3 U1 2 U2 6 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD APR PY 2001 VL 148 IS 4 BP L4 EP L4 DI 10.1149/1.1357189 PG 1 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 420MF UT WOS:000168008200068 ER PT J AU Cho, HS Kim, JG AF Cho, HS Kim, JG TI Electrical characteristics of gas avalanche pixel detectors with a thin semiconductive coating SO JOURNAL OF THE KOREAN PHYSICAL SOCIETY LA English DT Article ID MICROSTRIP; CHAMBERS; SILICON AB In this paper, a newly designed gaseous detector operating in the proportional mode, the so-called gas avalanche pixel detector, is described for a truly two-dimensional readout capability. The electrical characteristics of such a detector have been measured in terms of the defocusing effect, the gas gain, the rate capability, and the time stability. The intrinsically two-dimensional structure of these detectors makes them attractive for applications such as tracking sensors at colliders and X-ray imaging devices for next-generation high-intensity synchrotron radiation sources. C1 Yonsei Univ, Dept Med Engn, Coll Hlth Sci, Wonju 220710, South Korea. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA. RP Cho, HS (reprint author), Yonsei Univ, Dept Med Engn, Coll Hlth Sci, Wonju 220710, South Korea. NR 9 TC 3 Z9 3 U1 0 U2 0 PU KOREAN PHYSICAL SOC PI SEOUL PA 635-4, YUKSAM-DONG, KANGNAM-KU, SEOUL 135-703, SOUTH KOREA SN 0374-4884 J9 J KOREAN PHYS SOC JI J. Korean Phys. Soc. PD APR PY 2001 VL 38 IS 4 BP 305 EP 308 PG 4 WC Physics, Multidisciplinary SC Physics GA 422JU UT WOS:000168115400004 ER PT J AU Alford, WJ Smith, AV AF Alford, WJ Smith, AV TI Frequency-doubling broadband light in multiple crystals SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID OPTICAL PARAMETRIC OSCILLATORS; 3RD-HARMONIC GENERATION; MULTICRYSTAL DESIGNS; FEMTOSECOND PULSES; CONVERSION; BANDWIDTH AB We compare frequency doubling of broadband light in a single nonlinear crystal with doubling in five crystals with intercrystal temporal walk-off compensation and with doubling in five crystals adjusted for offset phase-matching frequencies. Using a plane-wave dispersive numerical model of frequency doubling, we study the bandwidth of the second harmonic and the conversion efficiency as functions of crystal length and fundamental irradiance. For low irradiance, the offset phase-matching arrangement has lower efficiency than a single crystal of the same total length but gives a broader second-harmonic bandwidth. The walk-off-compensated arrangement gives both higher conversion efficiency and broader bandwidth than a single crystal. At high irradiance, both multicrystal arrangements improve on the single-crystal efficiency while maintaining a broad bandwidth. (C) 2001 Optical Society of America. C1 Sandia Natl Labs, Dept Lasers Opt & Remote Sensing 1118, Albuquerque, NM 87185 USA. RP Alford, WJ (reprint author), Sandia Natl Labs, Dept Lasers Opt & Remote Sensing 1118, Albuquerque, NM 87185 USA. NR 15 TC 13 Z9 14 U1 3 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD APR PY 2001 VL 18 IS 4 BP 515 EP 523 DI 10.1364/JOSAB.18.000515 PG 9 WC Optics SC Optics GA 419XU UT WOS:000167975000013 ER PT J AU Alford, WJ Smith, AV AF Alford, WJ Smith, AV TI Wavelength variation of the second-order nonlinear coefficients of KNbO3, KTiOPO4, KTiOAsO4, LiNbO3, LiIO3, beta-BaB2O4, KH2PO4, and LiB3O5 crystals: a test of Miller wavelength scaling SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID MATCHED 2ND-HARMONIC GENERATION; POTASSIUM TITANYL PHOSPHATE; OPTICAL COEFFICIENTS; ABSOLUTE MEASUREMENT; PARAMETRIC FLUORESCENCE; PHASE; KTP; MAGNITUDE AB The measure second-order nonlinear coefficients using optical parametric amplification and second-harmonic generation over a range of wavelengths for the crystals KNbO3, KTiOPO4, KTiOAsO4, LiNbO3, LiIO3, beta -BaB2O4, KH2PO4, and LiB3O5. Combining our new measurements with previously reported values, we compare the wavelength variation of individual d(ijk)'s with Miller scaling, and we conclude that Miller scaling is a useful approximation for these crystals. (C) 2001 Optical Society of America. C1 Sandia Natl Labs, Laser Opt & Remote Sensing Dept, Albuquerque, NM 87185 USA. RP Alford, WJ (reprint author), Sandia Natl Labs, Laser Opt & Remote Sensing Dept, POB 5800, Albuquerque, NM 87185 USA. NR 31 TC 31 Z9 33 U1 0 U2 9 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD APR PY 2001 VL 18 IS 4 BP 524 EP 533 DI 10.1364/JOSAB.18.000524 PG 10 WC Optics SC Optics GA 419XU UT WOS:000167975000014 ER PT J AU Kuntz, DW Hassan, B Potter, DL AF Kuntz, DW Hassan, B Potter, DL TI Predictions of ablating hypersonic vehicles using an iterative coupled fluid/thermal approach SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER LA English DT Article ID CHEMICAL-KINETIC PROBLEMS; FUTURE NASA MISSIONS; ENTRIES AB A new iterative approach for the prediction of the ablation of hypersonic vehicles is presented. The solution technique is achieved by an iterative coupling of a computational fluid dynamics code and a material thermal response code through mass and energy balances at a common interface. The iterative approach proved necessary due to severe numerical instabilities that resulted when an explicit technique was employed involving a loose coupling approach between the two codes. The results presented are for an axisymmetric carbon-carbon nosetip on a reentry vehicle flying a ballistic trajectory. Details of the computational technique and the computed flowfield and material thermal response are presented. Comparisons were made with the widely used ABRES Shape Change Code (ASCC), and favorable results were obtained. C1 Sandia Natl Labs, Aerosci & Compressible Fluid Mech Dept, Albuquerque, NM 87185 USA. Sandia Natl Labs, Thermal Fluid Computat Engn Sci Dept, Albuquerque, NM 87185 USA. RP Kuntz, DW (reprint author), Sandia Natl Labs, Aerosci & Compressible Fluid Mech Dept, POB 5800,Mail Stop 0825, Albuquerque, NM 87185 USA. NR 51 TC 17 Z9 17 U1 0 U2 5 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 USA SN 0887-8722 J9 J THERMOPHYS HEAT TR JI J. Thermophys. Heat Transf. PD APR-JUN PY 2001 VL 15 IS 2 BP 129 EP 139 DI 10.2514/2.6594 PG 11 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA 424ZX UT WOS:000168264800001 ER PT J AU Peskin, AM AF Peskin, AM TI Making technology masculine: Men, women and modern machines in America, 1870-1945 SO JOURNAL OF URBAN TECHNOLOGY LA English DT Book Review C1 Brookhaven Natl Lab, Comp & Commun Div, Upton, NY 11973 USA. RP Peskin, AM (reprint author), Brookhaven Natl Lab, Comp & Commun Div, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CARFAX PUBLISHING PI BASINGSTOKE PA RANKINE RD, BASINGSTOKE RG24 8PR, HANTS, ENGLAND SN 1063-0732 J9 J URBAN TECHNOL JI J. Urban Technol. PD APR PY 2001 VL 8 IS 1 BP 106 EP 108 PG 3 WC Urban Studies SC Urban Studies GA 424JW UT WOS:000168230000010 ER PT J AU Henegariu, O Artan, S Greally, JM Chen, XN Korenberg, JR Vance, GH Stubbs, L Bray-Ward, P Ward, DC AF Henegariu, O Artan, S Greally, JM Chen, XN Korenberg, JR Vance, GH Stubbs, L Bray-Ward, P Ward, DC TI Cryptic translocation identification in human and mouse using several telomeric multiplex FISH (TM-FISH) strategies SO LABORATORY INVESTIGATION LA English DT Article ID IDIOPATHIC MENTAL-RETARDATION; CHROMOSOMAL REARRANGEMENTS; INTEGRITY; CHILDREN; FAMILY; PROBES; SET AB Experimental data published in recent years showed that up to 10% of all cases of mild to severe idiopathic mental retardation may result from small rearrangements of the subtelomeric regions of human chromosomes. To detect such cryptic translocations, we developed a "telomeric" multiplex fluorescence in situ hybridization (M-FISH) assay, using a set of previously published and commercially available subtelomeric probes. This set of probes includes 41 cosmid/PAC/P1 clones located from less than 100 kilobases to approximately 1 megabase from the end of the chromosomes. Similarly, a published mouse probe set, comprised of BACs hybridizing to the closest known marker toward the centromere and telomere of each mouse chromosome, was used to develop a mouse-specific "telomeric" M-FISH. Three different combinatorial labeling strategies were used to simultaneously detect all human subtelomeric regions on one slide. The simplest approach uses only three fluors and can be performed in laboratories lacking sophisticated imaging equipment or personnel highly trained in cytogenetics. A standard fluorescence microscope equipped with only three filters is sufficient. Fluor-dUTPs and labeled probes can be custom made. thus dramatically reducing costs. Images can be prepared using imaging software (Adobe Photoshop) and analysis performed by simple visual inspection. C1 Yale Univ, Sch Med, Dept Genet, New Haven, CT 06510 USA. Cedars Sinai Med Ctr, Dept Pediat, Los Angeles, CA 90048 USA. Cedars Sinai Med Ctr, Dept Human Genet, Los Angeles, CA 90048 USA. Indiana Univ, Dept Med Genet, Indianapolis, IN 46204 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. RP Henegariu, O (reprint author), Yale Univ, Sch Med, MB&B Dept, Microarray Facil, WWW 5,333 Cedar St, New Haven, CT 06510 USA. OI Stubbs, Lisa/0000-0002-9556-1972 NR 19 TC 22 Z9 23 U1 0 U2 4 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0023-6837 J9 LAB INVEST JI Lab. Invest. PD APR PY 2001 VL 81 IS 4 BP 483 EP 491 PG 9 WC Medicine, Research & Experimental; Pathology SC Research & Experimental Medicine; Pathology GA 423JW UT WOS:000168174000006 PM 11304567 ER PT J AU McCallum, RW Dennis, KW Jiles, DC Snyder, JE Chen, YH AF McCallum, RW Dennis, KW Jiles, DC Snyder, JE Chen, YH TI Composite magnetostrictive materials for advanced automotive magnetomechanical sensors SO LOW TEMPERATURE PHYSICS LA English DT Article ID MAGNETIZATION; PARTICLES; MATRIX; STRESS; RING AB In this paper we present the development of a composite magnetostrictive material for automotive applications. The material is based on cobalt ferrite, CoO . Fe2O3, and contains a small fraction of metallic matrix phase that serves both as a liquid-phase sintering aid during processing and enhances the mechanical properties over those of a simple sintered ferrite ceramic. In addition the metal matrix makes it possible to braze the material, making the assembly of a sensor relatively simple. The material exhibits good sensitivity and should have high corrosion resistance, while at the same time it is low in cost. (C) 2001 American Institute of Physics. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP McCallum, RW (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RI Jiles, David/H-9548-2012 NR 23 TC 47 Z9 47 U1 2 U2 13 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1063-777X J9 LOW TEMP PHYS+ JI Low Temp. Phys. PD APR PY 2001 VL 27 IS 4 BP 266 EP 274 DI 10.1063/1.1365598 PG 9 WC Physics, Applied SC Physics GA 420ZR UT WOS:000168037000003 ER PT J AU Pines, A AF Pines, A TI "Shining Light" on NMR and MRI in porous materials SO MAGNETIC RESONANCE IMAGING LA English DT Article; Proceedings Paper CT 5th International Meeting on Recent Advances in Magnetic Resonance Applications to Porous Media CY OCT 09-11, 2000 CL UNIV BOLOGNA, BOLOGNA, ITALY HO UNIV BOLOGNA C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. RP Pines, A (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0730-725X J9 MAGN RESON IMAGING JI Magn. Reson. Imaging PD APR-MAY PY 2001 VL 19 IS 3-4 BP 307 EP 309 DI 10.1016/S0730-725X(01)00241-7 PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 455YU UT WOS:000170056000005 PM 11445304 ER PT J AU Caprihan, A Clewett, CFM Kuethe, DO Fukushima, E Glass, SJ AF Caprihan, A Clewett, CFM Kuethe, DO Fukushima, E Glass, SJ TI Characterization of partially sintered ceramic powder compacts using fluorinated gas NMR imaging SO MAGNETIC RESONANCE IMAGING LA English DT Article; Proceedings Paper CT 5th International Meeting on Recent Advances in Magnetic Resonance Applications to Porous Media CY OCT 09-11, 2000 CL UNIV BOLOGNA, BOLOGNA, ITALY HO UNIV BOLOGNA DE fluorinated gas imaging; ceramics; porosity; NMR relaxation; diffusion coefficient ID POROUS-MEDIA; DIFFUSION; RELAXATION AB We use nuclear magnetic resonance (NMR) imaging of C2F6 gas to characterize porosity, mean pore size, and permeability of partially sintered ceramic (Y-TZP Yttria-stabilized tetragonal-zirconia polycrystal) samples. Conventional measurements of these parameters gave porosity values from 0.18 to 0.4, mean pore sizes from 10 nm to 40 nm, and permeability from 4 nm(2) to 25 nm(2). The NMR methods are based on relaxation time measurements (T-1) and the time dependent diffusion coefficient D(Delta). The relaxation time of C2F6 gas is longer in pores than in bulk gas and it increases as the pore sizes decrease. NMR yielded accurate porosity values after correcting for surface adsorption effects. A model for T-1 dependence on pore size that accounts for collisions between gas molecules and walls as well as surface adsorption effects is proposed. The model fits the experimental data well. Finally, the long time limit of D(Delta)/D-o, where D-o is the hulk gas diffusion coefficient is useful for measuring tortuosity, while the short time limit was not achieved experimentally and could not be used for calculating surface-area to volume (S/V) ratios. (C) 2001 Elsevier Science Inc. All rights reserved. C1 New Mexico Resonance, Albuquerque, NM USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Caprihan, A (reprint author), New Mexico Resonance, Albuquerque, NM USA. OI Fukushima, Eiichi/0000-0003-1670-5884 FU NHLBI NIH HHS [1R29HL57967-01] NR 13 TC 18 Z9 19 U1 1 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0730-725X J9 MAGN RESON IMAGING JI Magn. Reson. Imaging PD APR-MAY PY 2001 VL 19 IS 3-4 BP 311 EP 317 DI 10.1016/S0730-725X(01)00242-9 PG 7 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 455YU UT WOS:000170056000006 PM 11445305 ER PT J AU Merkle, KL Thompson, LJ AF Merkle, KL Thompson, LJ TI Atomic-scale observation of grain boundary motion SO MATERIALS LETTERS LA English DT Article DE HREM; grain boundaries; migration mechanisms; atomic-scale structure ID MOLECULAR-DYNAMICS; MIGRATION; DISLOCATIONS; RESOLUTION; METALS AB Atomic-scale grain boundary (GB) migration mechanisms are investigated by high-resolution transmission electron microscopy (HREM). For the first time, atomic-scale motion of high-angle twist as well as general GBs is directly observed by HREM. GB motion was found to proceed by the propagation of atomic-scale steps for two quite different GB geometries. Time-resolved HREM indicates that migration mechanisms of high-angle GBs also include cooperative effects, whereby groups of atoms spontaneously rearrange their lattice positions to be incorporated into the growing grain. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Merkle, KL (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave,MSD,Bldg 212, Argonne, IL 60439 USA. NR 20 TC 45 Z9 45 U1 3 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD APR PY 2001 VL 48 IS 3-4 BP 188 EP 193 DI 10.1016/S0167-577X(00)00301-3 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 420VC UT WOS:000168025100011 ER PT J AU Gottschall, RJ AF Gottschall, RJ TI Recent advances and future research directions in bulk metallic glasses SO MATERIALS TRANSACTIONS LA English DT Article; Proceedings Paper CT Bulk Metallic Glasses Conference CY SEP 24-28, 2000 CL SINGAPORE, SINGAPORE DE structural relaxation; positron annihilation; nuclear magnetic resonance; neutron scattering; internal friction; specific heat; molecular dynamics; differential scanning calorimetry; viscosity; local density functional techniques; Car-Parrinello; tight-binding; Monte Carlo; differential anomalous scattering; small angle neutron scattering; electron beam microcharacterization AB These opening remarks will briefly mention recent advances in characterizing the atomic and electronic structure, glass forming ability, thermal stability and mechanical and magnetic properties of bulk metallic glasses. Future research directions may include the development of first principles models to predict ranges of possible alloy compositions, under-cooling limits, and glass transition temperatures, etc; the identification of thermodynamic, geometric, electronic, chemical and kinetic parameters for the models: and the correlation of glass nanostructure and chemistry with properties and behavior. The ultimate objective is to predict and control the high mechanical strength and fracture toughness, low sliding-friction coefficient and high wear resistance, corrosion resistance, and low magnetic energy loss corresponding to particular bulk metallic glass compositions and process parameters. C1 US DOE, Off Sci, Off Bas Energy Sci, Div Engn & Mat Sci, Germantown, MD 20874 USA. RP Gottschall, RJ (reprint author), US DOE, Off Sci, Off Bas Energy Sci, Div Engn & Mat Sci, SC-13,19901 Germantown Rd, Germantown, MD 20874 USA. EM Robert.Gottschall@science.doe.gov NR 6 TC 14 Z9 16 U1 0 U2 9 PU JAPAN INST METALS PI SENDAI PA 1-14-32, ICHIBANCHO, AOBA-KU, SENDAI, 980-8544, JAPAN SN 1345-9678 EI 1347-5320 J9 MATER TRANS JI Mater. Trans. PD APR PY 2001 VL 42 IS 4 BP 548 EP 550 DI 10.2320/matertrans.42.548 PG 3 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 435EH UT WOS:000168864100002 ER PT J AU Hufnagel, TC Gu, XF Munkholm, A AF Hufnagel, TC Gu, XF Munkholm, A TI Anomalous small-angle X-ray scattering studies of phase separation in bulk amorphous Zr52.5Ti5Cu17.9Ni14.6Al10 SO MATERIALS TRANSACTIONS LA English DT Article; Proceedings Paper CT Bulk Metallic Glasses Conference CY SEP 24-28, 2000 CL SINGAPORE, SINGAPORE DE zirconium-based bulk amorphous alloy; small-angle X-ray scattering; phase separation; spinodal decomposition; precipitation ID SUPERCOOLED LIQUID; DECOMPOSITION; CRYSTALLIZATION; ALLOY AB We have performed differential anomalous small-angle X-ray scattering (ASAXS) experiments on samples of bulk amorphous Zr52.5Ti5Cu17.9Ni14.6Al10 annealed in the supercooled liquid region. We observe the development of strong small-angle scattering, associated with phase separation on the nanometer scale in the supercooled liquid. Analysis of the Zr-edge ASAXS data reveals that this phase separation is largely due to a redistribution of Zr. Continued annealing results in the nucleation and growth of Zr-rich crystalline intermetallic phases. C1 Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA. RI Gu, Xiaofeng/E-8287-2013; Hufnagel, Todd/A-3309-2010 OI Gu, Xiaofeng/0000-0001-8299-6451; Hufnagel, Todd/0000-0002-6373-9377 NR 12 TC 11 Z9 11 U1 0 U2 2 PU JAPAN INST METALS PI SENDAI PA 1-14-32, ICHIBANCHO, AOBA-KU, SENDAI, 980-8544, JAPAN SN 1345-9678 EI 1347-5320 J9 MATER TRANS JI Mater. Trans. PD APR PY 2001 VL 42 IS 4 BP 562 EP 564 DI 10.2320/matertrans.42.562 PG 3 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 435EH UT WOS:000168864100005 ER PT J AU Nieh, TG Wadsworth, J Liu, CT Ice, GE Chung, KS AF Nieh, TG Wadsworth, J Liu, CT Ice, GE Chung, KS TI Extended plasticity in the supercooled liquid region of bulk metallic glasses SO MATERIALS TRANSACTIONS LA English DT Article; Proceedings Paper CT Bulk Metallic Glasses Conference CY SEP 24-28, 2000 CL SINGAPORE, SINGAPORE DE metallic glasses; viscous flow; superplasticity; dynamic crystallization; amorphous alloys; Newtonian solids ID AMORPHOUS-ALLOYS; BEHAVIOR; DEFORMATION; FLOW; SUPERPLASTICITY; STRENGTH; PHASE AB Bulk metallic glasses have good mechanical formability in viscous states. The good formability offers a great advantage of fabricating near-net-shape structural components. Whereas large tensile ductility has been observed in metallic glasses in the supercooled liquid region, the exact deformation mechanism, and particularly whether such alloys deform by Newtonian viscous flow (m = 1, where m is the strain rate sensitivity exponent) or not, remains a controversial issue. In this paper, existing data are analyzed and the apparent controversy is discussed. Results obtained from an amorphous alloy (composition: Zr-10Al-5Ti-17.9Cu-14.6Ni in at%) are presented. Dynamic structural evolution is characterized using electron microscopy and focus X-ray. It is demonstrated that, despite the fact that the deformation was carried out in the supercooled liquid range, concurrent crystallization of the amorphous structure occurred. As a result, a non-Newtonian behavior was observed. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Nieh, TG (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L350, Livermore, CA 94551 USA. RI Nieh, Tai-Gang/G-5912-2011; OI Nieh, Tai-Gang/0000-0002-2814-3746; Liu, Chain Tsuan/0000-0001-7888-9725 NR 25 TC 22 Z9 22 U1 0 U2 2 PU JAPAN INST METALS PI SENDAI PA 1-14-32, ICHIBANCHO, AOBA-KU, SENDAI, 980-8544, JAPAN SN 1345-9678 EI 1347-5320 J9 MATER TRANS JI Mater. Trans. PD APR PY 2001 VL 42 IS 4 BP 613 EP 618 DI 10.2320/matertrans.42.613 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 435EH UT WOS:000168864100013 ER PT J AU Flores, KM Suh, D Howell, R Asoka-Kumar, P Sterne, PA Dauskardt, RH AF Flores, KM Suh, D Howell, R Asoka-Kumar, P Sterne, PA Dauskardt, RH TI Flow and fracture of bulk metallic glass alloys and their composites SO MATERIALS TRANSACTIONS LA English DT Article; Proceedings Paper CT Bulk Metallic Glasses Conference CY SEP 24-28, 2000 CL SINGAPORE, SINGAPORE DE amorphous metal; metallic glass; fracture; stress state effects; plasticity ID AMORPHOUS-ALLOYS; BEHAVIOR; PLASTICITY; MECHANISM AB The fracture and plastic deformation mechanisms of a Zr-Ti-Ni-Cu-Be bulk metallic glass and a composite utilizing a crystalline reinforcement phase are reviewed. The relationship between stress state? free volume and shear band formation are discussed. Positron annihilation techniques were used to confirm the predicted increase in free volume after plastic straining. Strain localization and failure were examined for a wide range of stress states. Finally, methods for toughening metallic glasses are considered. Significant increases in toughness are demonstrated for a composite bulk metallic glass containing a ductile second phase which stabilizes shear band formation and distributes plastic deformation. C1 Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Flores, KM (reprint author), Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA. NR 16 TC 24 Z9 25 U1 0 U2 7 PU JAPAN INST METALS PI SENDAI PA 1-14-32, ICHIBANCHO, AOBA-KU, SENDAI, 980-8544, JAPAN SN 1345-9678 EI 1347-5320 J9 MATER TRANS JI Mater. Trans. PD APR PY 2001 VL 42 IS 4 BP 619 EP 622 DI 10.2320/matertrans.42.619 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 435EH UT WOS:000168864100014 ER PT J AU de Pillis, EG de Pillis, LG AF de Pillis, EG de Pillis, LG TI The long-term impact of university budget cuts: A mathematical model SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article DE mathematical university model; diffusion of innovation; higher education; tertiary education; budget cuts ID ECONOMIC-GROWTH; EDUCATION; LAYOFFS; SURVIVORS; RETURNS; POLICY; TWINS AB Policymakers acknowledge the regional benefits of the university, yet cut higher education budgets. Incorporating the theory of diffusion of innovation, we develop a mathematical model to explore the long-term effects of university budget cuts. Simulations indicate that the full impact of budget modifications may not be realized for several decades. (C) 2001 Elsevier Science Ltd. All rights reserved. C1 Univ Hawaii, Sch Business, Hilo, HI 96720 USA. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP de Pillis, LG (reprint author), Harvey Mudd Coll, Dept Math, Claremont, CA 91711 USA. NR 80 TC 0 Z9 0 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD APR-MAY PY 2001 VL 33 IS 8-9 BP 851 EP 876 DI 10.1016/S0895-7177(00)00285-5 PG 26 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA 420VB UT WOS:000168025000004 ER PT J AU Lee, KB Ahn, JP Kwon, H AF Lee, KB Ahn, JP Kwon, H TI Characteristics of AA6061/BN composite fabricated by pressureless infiltration technique SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID METAL-MATRIX COMPOSITES; BORON-NITRIDE; LIQUID ALUMINUM; MICROSTRUCTURAL DEVELOPMENT; INTERFACIAL REACTION; MAGNESIUM NITRIDE; MOLTEN ALUMINUM; WETTABILITY; CERAMICS; TECHNOLOGIES AB Spontaneous infiltration and strengthening behaviors were analyzed in terms of microstructures and tensile properties of AA6061/BN composite fabricated by pressureless infiltration technique in the presence of both Mg and nitrogen. The microstructure and properties were compared with control AA6061 without BN fabricated by the same method. The Mg3N2 formed by the reaction of Mg vapor and nitrogen gas, which coated the particles in the powder bed, is believed to induce spontaneous infiltration through greatly enhancing wetting by means of the reaction Mg3N2 + 2Al -, 2A1N + 3Mg. This was identified by the finding of AIN particle layers on the surfaces of prior Al particles in the powder bed, which made contact with the infiltrating melt. In addition, unreacted Mg3N2 was observed outside the composite, where the Al melt did not come into direct contact. Fine AlN particles formed in situ resulted in significant strengthening, even in the control alloy, with no addition of BN. In the composite reinforced with BN, additional AIN was formed by the interfacial reaction of the BN and Al melt as well as by the in situ reaction. Consequently, both the BN particles and the additional AIN particles formed by the interfacial reaction led to a further strengthening in the composite, as compared to the control alloy, which was strengthened only by the AIN particles formed in situ. In addition, the flake shape of BN may have lent considerable strength, due to the high aspect ratio it demonstrates, as compared with that of a spherically shaped particle. C1 Kookmin Univ, Sch Met & Mat Engn, Seoul 136702, South Korea. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. POSTECH, Ctr Adv Aerosp Mat, Pohang 790784, South Korea. RP Lee, KB (reprint author), Kookmin Univ, Sch Met & Mat Engn, Seoul 136702, South Korea. NR 30 TC 25 Z9 26 U1 0 U2 7 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 APR PY 2001 VL 32 IS 4 BP 1007 EP 1018 DI 10.1007/s11661-001-0358-5 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 420NW UT WOS:000168011900016 ER PT J AU Davidson, DL Maziasz, PJ Jones, JW AF Davidson, DL Maziasz, PJ Jones, JW TI Dislocation structures in a deformed Nb-Cr-Ti solid solution alloy SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID FRACTURE C1 SW Res Inst, San Antonio, TX 78228 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37834 USA. NR 12 TC 6 Z9 6 U1 0 U2 1 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 APR PY 2001 VL 32 IS 4 BP 1023 EP 1027 DI 10.1007/s11661-001-0360-y PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 420NW UT WOS:000168011900018 ER PT J AU Park, JM Kim, KH Kim, CK Meyer, MK Hofman, GL Strain, RV AF Park, JM Kim, KH Kim, CK Meyer, MK Hofman, GL Strain, RV TI The irradiation behavior of atomized U-Mo alloy fuels at high temperature SO METALS AND MATERIALS-KOREA LA English DT Article DE RERTR; ATR; post-irradiation; atomized U-Mo dispersion fuel; fuel behavior; high temperature irradiation AB Post-irradiation examinations of atomized U-10Mo, U-6Mo, and U-6Mo-1.7Os dispersion fuels from the RERTR-3 experiment irradiated in the Advanced Test Reactor (ATR) were carried out in order to investigate the fuel behavior of high uranium loading (8 gU/cc) at a high temperature (higher than 200 degreesC). It was observed after about 40 at% BU that the U-Mo alloy fuels at a high temperature showed similar irradiation bubble morphologies compared to those at a lower temperature found in the RERTR-1 irradiation result, but there was a thick reaction layer with the aluminum matrix which was found to be greatly affected by the irradiation temperature and to a lesser degree by the fuel composition. In addition, the chemical analysis for the irradiated U-Mo fuels using the Electron Probe Micro Analysis (EPMA) method were conducted to investigate the compositional changes during the formation of the reaction product. C1 Korea Atom Energy Res Inst, Yusung Ku, Taejon 305353, South Korea. Argonne Natl Lab, Argonne, IL 60439 USA. RP Park, JM (reprint author), Korea Atom Energy Res Inst, Yusung Ku, 150 Dukjin Dong, Taejon 305353, South Korea. OI Meyer, Mitchell/0000-0002-1980-7862 NR 13 TC 6 Z9 6 U1 2 U2 6 PU KOREAN INST METALS MATERIALS PI SEOUL PA POSCO CENTER, 4TH FL (EAST WING), 892 DAECHI-4-DONG, KANGNAM-KU, SEOUL 135-777, SOUTH KOREA SN 1225-9438 J9 MET MATER-KOREA JI Met. Mater.-Korea PD APR PY 2001 VL 7 IS 2 BP 151 EP 157 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 430JP UT WOS:000168571000010 ER PT J AU Pedersen, H Spalding, RE Tagliaferri, E Ceplecha, Z Risbo, T Haack, H AF Pedersen, H Spalding, RE Tagliaferri, E Ceplecha, Z Risbo, T Haack, H TI Greenland superbolide event of 1997 December 9 SO METEORITICS & PLANETARY SCIENCE LA English DT Article ID EARTHS ATMOSPHERE; LARGE METEOROIDS; BOLIDES; FRAGMENTATION; IMPACTS AB Data on the trajectory and orbit of an extremely bright bolide (superbolide) over Greenland on 1997 December 9 are given, and circumstances of the phenomenon and its observations are described. A surveillance video camera and satellite-based records enabled computing the trajectory and orbit independently of visual sightings of casual observers. The superbolide body of about 36 000 kg penetrated the atmosphere with an initial velocity of 30.5 +/- 1.7 km s(-1). Its orbit was a long-period orbit and seems to be at variance with the low value of ablation coefficient (0.017 kg MJ(-1)) derived from modeling the atmospheric trajectory. However, such an event has been documented previously. Also the intensity and brevity of the satellite-detected light flares are highly unusual. The impact area of the main hypothetical remnant of the body is given. Search for meteorites was performed. No meteorites were recovered. Also analysis of snow samples gave no hint of meteoritic dust. C1 Copenhagen Univ Observ, DK-2100 Copenhagen O, Denmark. Sandia Natl Labs, Albuquerque, NM 87185 USA. Aerospace Corp, Los Angeles, CA 90009 USA. Univ Copenhagen, Dept Geophys, DK-2100 Copenhagen O, Denmark. Univ Copenhagen, Geol Museum, DK-1350 Copenhagen K, Denmark. Acad Sci Czech Republ, Inst Astron, CS-25165 Ondrejov, Czech Republic. RP Ceplecha, Z (reprint author), Acad Sci Czech Republ, Inst Astron, CS-25165 Ondrejov, Czech Republic. RI Haack, Henning/A-4807-2013 OI Haack, Henning/0000-0002-4618-3178 NR 16 TC 6 Z9 6 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 0026-1114 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD APR PY 2001 VL 36 IS 4 BP 549 EP 558 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 445FW UT WOS:000169448300008 ER PT J AU Takata, M Sasaki, MS Tachiiri, S Fukushima, T Sonoda, E Schild, D Thompson, LH Takeda, S AF Takata, M Sasaki, MS Tachiiri, S Fukushima, T Sonoda, E Schild, D Thompson, LH Takeda, S TI Chromosome instability and defective recombinational repair in knockout mutants of the five Rad51 paralogs SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Article ID STRAND BREAK REPAIR; CANCER SUSCEPTIBILITY GENE; SISTER-CHROMATID EXCHANGES; HOMOLOGY-DIRECTED REPAIR; DNA-DAMAGE; IONIZING-RADIATION; VERTEBRATE CELLS; MAMMALIAN-CELLS; NUCLEAR FOCI; MOUSE GENES AB The Rad51 protein, a eukaryotic homologue of Escherichia coli RecA, plays a central role in both mitotic and meiotic homologous DNA recombination (HR) in Saccharomyces cerevisiae and is essential for the proliferation of vertebrate cells. Five vertebrate genes, RAD51B, -C, and -D and XRCC2 and -3, are implicated in HR on the basis of their sequence similarity to Rad51 (Rad51 paralogs). We generated mutants deficient in each of these proteins in the chicken B-lymphocyte DT40 cell line and report here the comparison of four new mutants and their complemented derivatives with our previously reported rad51b mutant. The Rad51 paralog mutations all impair HR, as measured by targeted integration and sister chromatid exchange. Remarkably, the mutant cell lines all exhibit very similar phenotypes: spontaneous chromosomal aberrations, high sensitivity to killing by cross-linking agents (mitomycin C and cisplatin), mild sensitivity to gamma rays, and significantly attenuated Rad51 focus formation during recombinational repair after exposure to gamma rays. Moreover, all mutants show partial correction of resistance to DNA damage by overexpression of human Rad51. We conclude that the Rad51 paralogs participate in repair as a functional unit that facilitates the action of Rad51 in HR. C1 Kyoto Univ, Fac Med, CREST Res Project, Fac Med,Sakyo Ku, Kyoto 6068501, Japan. Kyoto Univ, Ctr Radiat Biol, Kyoto 6068501, Japan. JST, CREST, Kawaguchi, Japan. Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA. Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 95441 USA. RP Takeda, S (reprint author), Kyoto Univ, Fac Med, CREST Res Project, Fac Med,Sakyo Ku, Kyoto 6068501, Japan. FU NIGMS NIH HHS [GM30990] NR 76 TC 390 Z9 392 U1 1 U2 12 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 APR PY 2001 VL 21 IS 8 BP 2858 EP 2866 DI 10.1128/MCB.21.8.2858-2866.2001 PG 9 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 416BN UT WOS:000167760000023 PM 11283264 ER PT J AU Davis, LM Glenn, TC Elsey, RM Dessauer, HC Sawyer, RH AF Davis, LM Glenn, TC Elsey, RM Dessauer, HC Sawyer, RH TI Multiple paternity and mating patterns in the American alligator, Alligator mississippiensis SO MOLECULAR ECOLOGY LA English DT Article DE alligator; mating systems; microsatellites; multiple paternity; mutation rate; population genetics ID SPERM STORAGE; THAMNOPHIS-SIRTALIS; MOLECULAR-GENETICS; REPRODUCTIVE-CYCLE; GARTER SNAKE; VIPERA-BERUS; POPULATION; SELECTION; MARKERS; ECOLOGY AB Eggs were sampled from 22 wild American alligator nests from the Rockefeller Wildlife Refuge in south-west Louisiana, along with the females guarding the nests. Three nests were sampled in 1995 and 19 were sampled in 1997. Females and offspring from all clutches were genotyped using five polymorphic microsatellite loci and the three nests from 1995 were also genotyped using one allozyme locus. Genotypes of the hatchlings were consistent with the guarding females being the mothers of their respective clutches. Multiple paternity was found in seven of the 22 clutches with one being fathered by three males, and the remaining six clutches ha cling genotypes consistent with tyro males per clutch. Paternal contributions of multiply shed clutches were skewed. Some males sired hatchlings of more than one of the 22 clutches either as one of two sires of a multiple paternity clutch, as the sole sire of two different clutches, or as the sole sire of one clutch and one of two sires of a multiply sired clutch. There was no significant difference between females that had multiple paternity clutches and those that had singly sired clutches with respect to female total length (P = 0.844) and clutch size (P = 0.861). Also, there was no significant correlation between genetic relatedness of nesting females and pairwise nest distances (r(2) = 0.003, F-1,F-208 = 0.623, P = 0.431), indicating that females in this sample that nested close to one another were no more related than any two nesting females chosen at random. Eleven mutations were detected among hatchlings at the five loci over the 22 clutches. Most of these mutations (eight of 11) occurred at Ami mu -17, the only compound microsatellite locus of the five used in this study, corresponding to a mutation rate of 1.7 x 10(-3). Finally, most of the mutations (82%) were homoplasious, i.e., mutating to an allelic state already present in this Louisiana population. C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. Univ S Carolina, Dept Biol Sci, Columbia, SC 29208 USA. Louisiana Dept Wildlife & Fisheries, Rockefeller Wildlife Refuge, Grand Chenier, LA 70643 USA. Louisiana State Univ, Dept Biochem, New Orleans, LA 70119 USA. RP Glenn, TC (reprint author), Univ Georgia, Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. EM Glenn@srel.edu RI Glenn, Travis/A-2390-2008 NR 88 TC 57 Z9 63 U1 2 U2 15 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0962-1083 EI 1365-294X J9 MOL ECOL JI Mol. Ecol. PD APR PY 2001 VL 10 IS 4 BP 1011 EP 1024 DI 10.1046/j.1365-294X.2001.01241.x PG 14 WC Biochemistry & Molecular Biology; Ecology; Evolutionary Biology SC Biochemistry & Molecular Biology; Environmental Sciences & Ecology; Evolutionary Biology GA 428RH UT WOS:000168455500017 PM 11348507 ER PT J AU Trudolyubov, SP Borozdin, KN Priedhorsky, WC AF Trudolyubov, SP Borozdin, KN Priedhorsky, WC TI RXTE observations of 4U 1630-47 during the peak of its 1998 outburst SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE black hole physics; binaries : general; stars : individual : 4U 1630-47; novae, cataclysmic variables; X-rays : general ID BLACK-HOLE CANDIDATES; X-RAY SOURCE; TRANSIENT 4U-1630-47; STATE TRANSITION; TIMING EVOLUTION; ACCRETION DISKS; SPECTRA; GRS-1915+105; VARIABILITY; EXPLORER AB We present an analysis of the RXTE observations of 4U 1630-47 during its 1998 outburst. The light curve and the spectral evolution of the outburst were significantly different from the outbursts of the same source in 1996 and 1999. Special emphasis was placed on observations taken during the initial rise and during the maximum of the outburst. The maximum of the outburst was divided into three plateaux, with almost constant flux within each plateau, and fast jumps between them. The spectral and timing parameters are stable for each individual plateau, but significantly different between the plateaux, The variability detected on the first plateau is of special interest. During these observations the source exhibits quasi-regular oscillations with a period of similar to 10-20 s. Our analysis revealed a difference in temporal behaviour of the source at high and low fluxes during this period of time. The source behaviour can be generally explained in the framework of the two-phase model of accretion flow, involving a hot inner Comptonization region and surrounding optically thick disc. The variability and spectral evolution of the source were similar to what was observed earlier for other X-ray novae. We show that 4U 1630-47 resembles, in several aspects, other transient and persistent black hole binaries. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Russian Acad Sci, Space Res Inst, Moscow 117810, Russia. RP Trudolyubov, SP (reprint author), Univ Calif Los Alamos Natl Lab, MS D436, Los Alamos, NM 87545 USA. OI Priedhorsky, William/0000-0003-0295-9138 NR 46 TC 23 Z9 23 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD OX2 0NE, OXON, ENGLAND SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD APR 1 PY 2001 VL 322 IS 2 BP 309 EP 320 DI 10.1046/j.1365-8711.2001.04073.x PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 421EU UT WOS:000168049800011 ER PT J AU Doroshkevich, AG Tucker, DL Fong, R Turchaninov, V Lin, H AF Doroshkevich, AG Tucker, DL Fong, R Turchaninov, V Lin, H TI Large-scale galaxy distribution in the Las Campanas Redshift Survey SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE surveys; galaxies : clusters : general; large-scale structure of Universe ID N-BODY SIMULATIONS; COLD DARK-MATTER; POWER SPECTRUM; MPC SCALES; UNIVERSE; SUPERCLUSTERS; EVOLUTION; FILAMENTS; CLUSTERS; VOIDS AB We make use of three-dimensional clustering analysis, inertia tensor methods, and the minimal spanning tree, technique to estimate some physical and statistical characteristics of the large-scale galaxy distribution and, in particular, of the sample of overdense regions seen in the Las Campanas Redshift Survey (LCRS). Our investigation provides additional evidence for a network of structures found in our core sampling analysis of the LCRS: a system of rich sheet-like structures, which in turn surround large underdense regions criss-crossed by a variety of filamentary structures. We find that the overdense regions contain similar to 40-50 per cent of LCRS galaxies and have proper sizes similar to those of nearby superclusters. The formation of such structures can be roughly described as a non-linear compression of protowalls of typical cross-sectional size similar to 20-25 h(-1) Mpc; this scale is similar to5 times the conventional value for the onset of non-linear clustering - to wit, r(0), the autocorrelation length for galaxies. The comparison with available simulations and theoretical estimates shows that the formation of structure elements with parameters similar to those observed is presently possible only in low-density cosmological models, Omega (m)h similar to 0.2-0.3, with a suitable large-scale bias between galaxies and dark matter. C1 Theoret Astrophys Ctr, DK-2100 Copenhagen O, Denmark. Russian Acad Sci, MV Keldysh Appl Math Inst, Moscow 125047, Russia. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Durham, Dept Phys, Durham DH1 3LE, England. Univ Arizona, Steward Observ, Tucson, AZ 85721 USA. RP Doroshkevich, AG (reprint author), Theoret Astrophys Ctr, Juliane Maries Vej 30, DK-2100 Copenhagen O, Denmark. EM dorr@tac.dk NR 72 TC 31 Z9 31 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD APR 1 PY 2001 VL 322 IS 2 BP 369 EP 388 DI 10.1046/j.1365-8711.2001.04121.x PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 421EU UT WOS:000168049800016 ER PT J AU Bishop, D Heuer, A Williams, D AF Bishop, D Heuer, A Williams, D TI Microelectro-mechanical systems: Technology and applications SO MRS BULLETIN LA English DT Editorial Material C1 Bell Labs, Lucent Technol, Micromech Res Dept, Murray Hill, NJ 07974 USA. Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA. Sandia Natl Labs, Microsyst Sci Technol & Components Ctr, Livermore, CA 94550 USA. RP Bishop, D (reprint author), Bell Labs, Lucent Technol, Micromech Res Dept, 600 Mt Ave, Murray Hill, NJ 07974 USA. NR 0 TC 7 Z9 8 U1 1 U2 5 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD APR PY 2001 VL 26 IS 4 BP 282 EP 282 DI 10.1557/mrs2001.60 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 424MU UT WOS:000168236700013 ER PT J AU Franke, AE King, TJ Howe, RT AF Franke, AE King, TJ Howe, RT TI Integrated MEMS technologies SO MRS BULLETIN LA English DT Article ID GERMANIUM C1 Motorola Inc, Adv Prod Res & Dev Lab, Austin, TX 78721 USA. Univ Calif Berkeley, Microfabricat Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Elect Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Comp Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley Sensor & Actuator Ctr, Berkeley, CA 94720 USA. RP Franke, AE (reprint author), Motorola Inc, Adv Prod Res & Dev Lab, 3501 Ed Bluestein Blvd, Austin, TX 78721 USA. NR 19 TC 7 Z9 8 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0883-7694 EI 1938-1425 J9 MRS BULL JI MRS Bull. PD APR PY 2001 VL 26 IS 4 BP 291 EP 295 DI 10.1557/mrs2001.62 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 424MU UT WOS:000168236700015 ER PT J AU de Boer, MP Mayer, TM AF de Boer, MP Mayer, TM TI Tribology of MEMS SO MRS BULLETIN LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; FRICTION MEASUREMENT; FILMS; ADHESION; SILICON; DEPOSITION; SURFACES; BEAMS C1 Sandia Natl Labs, Surface Micromachining Dept, Tech Staff, Albuquerque, NM 87185 USA. Sandia Natl Labs, Surface & Interface Sci Dept, Tech Staff, Albuquerque, NM 87185 USA. RP de Boer, MP (reprint author), Sandia Natl Labs, Surface Micromachining Dept, Tech Staff, POB 5800,MS 1080, Albuquerque, NM 87185 USA. RI de Boer, Maarten/C-1525-2013 OI de Boer, Maarten/0000-0003-1574-9324 NR 31 TC 100 Z9 100 U1 2 U2 20 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD APR PY 2001 VL 26 IS 4 BP 302 EP 304 DI 10.1557/mrs2001.65 PG 3 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 424MU UT WOS:000168236700018 ER PT J AU Sullivan, JP Friedmann, TA Hjort, K AF Sullivan, JP Friedmann, TA Hjort, K TI Diamond and amorphous carbon MEMS SO MRS BULLETIN LA English DT Article ID TETRAHEDRAL CARBON; FABRICATION; MICROSTRUCTURES; TECHNOLOGY; SYSTEMS; FILMS; TIPS C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Uppsala, Dept Mat Sci, Angstrom Lab, S-75121 Uppsala, Sweden. RP Sullivan, JP (reprint author), Sandia Natl Labs, MS 1421,POB 5800, Albuquerque, NM 87185 USA. NR 25 TC 81 Z9 81 U1 1 U2 10 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD APR PY 2001 VL 26 IS 4 BP 309 EP 311 DI 10.1557/mrs2001.68 PG 3 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 424MU UT WOS:000168236700021 ER PT J AU Lindner, D AF Lindner, D TI Microsystems for chemical and biological applications SO MRS BULLETIN LA English DT Article ID ANALYSIS SYSTEMS; ARRAY; MICROREACTORS; DEVICES; CHIP C1 Sandia Natl Labs, Exploratory Syst Ctr, Livermore, CA 94550 USA. RP Lindner, D (reprint author), Sandia Natl Labs, Exploratory Syst Ctr, Livermore, CA 94550 USA. EM dllindn@sandia.gov NR 29 TC 11 Z9 11 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD APR PY 2001 VL 26 IS 4 BP 333 EP 336 DI 10.1557/mrs2001.75 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 424MU UT WOS:000168236700028 ER PT J AU Hruby, J AF Hruby, J TI LIGA technologies and applications SO MRS BULLETIN LA English DT Article ID MICROSTRUCTURES; THICKNESS C1 Sandia Natl Labs, Ctr Mat Sci & Engn, Livermore, CA 94550 USA. RP Hruby, J (reprint author), Sandia Natl Labs, Ctr Mat Sci & Engn, Livermore, CA 94550 USA. NR 15 TC 47 Z9 47 U1 1 U2 5 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD APR PY 2001 VL 26 IS 4 BP 337 EP 340 DI 10.1557/mrs2001.76 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 424MU UT WOS:000168236700029 ER PT J AU Briknarova, K Takayama, S Brive, L Havert, ML Knee, DA Velasco, J Homma, S Cabezas, E Stuart, J Hoyt, DW Satterthwait, AC Llinas, M Reed, JC Ely, KR AF Briknarova, K Takayama, S Brive, L Havert, ML Knee, DA Velasco, J Homma, S Cabezas, E Stuart, J Hoyt, DW Satterthwait, AC Llinas, M Reed, JC Ely, KR TI Structural analysis of BAG1 cochaperone and its interactions with Hsc70 heat shock protein SO NATURE STRUCTURAL BIOLOGY LA English DT Article ID HSP70 CHAPERONE ACTIVITY; 3-DIMENSIONAL STRUCTURE; GLUCOCORTICOID RECEPTOR; BCL-2-BINDING PROTEIN; NEGATIVE REGULATOR; COGNATE PROTEIN; ATPASE FRAGMENT; DOWN-REGULATION; CHEMICAL-SHIFT; CELL-DEATH AB BAG-family proteins share a conserved protein interaction region, called the 'BAG domain' which binds and regulates Hsp70/Hsc70 molecular chaperones. This family of cochaperones functionally regulates signal transducing proteins and transcription factors important for cell stress responses, apoptosis, proliferation, cell migration and hormone action. Aberrant overexpression of the founding member of this family, BAG1, occurs in human cancers. In this study, a structure-based approach was used to identify interacting residues in a BAG1-Hsc70 complex. An Hsc70-binding fragment of BAG1 was shown by multidimensional NMR methods to consist of an antiparallel three-helix bundle. NMR chemical shift experiments marked surface residues on the second (alpha2) and third (alpha3) helices in the BAG domain that are involved in chaperone binding. Structural predictions were confirmed by site-directed mutagenesis of these residues, resulting in loss of binding of BAG1 to Hsc70 in vitro and in cells. Molecular docking of BAG1 to Hsc70 and mutagenesis of Hsc70 marked the molecular surface of the ATPase domain necessary for interaction with BAG1. The results provide a structural basis for understanding the mechanism by which BAG proteins link molecular chaperones and cell signaling pathways. C1 Burnham Inst, La Jolla, CA 92037 USA. Pacific NW Natl Lab, EMSL, Richland, WA 99352 USA. Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA. RP Ely, KR (reprint author), Burnham Inst, La Jolla, CA 92037 USA. RI Hoyt, David/H-6295-2013 NR 35 TC 97 Z9 100 U1 0 U2 11 PU NATURE AMERICA INC PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1072-8368 J9 NAT STRUCT BIOL JI Nat. Struct. Biol. PD APR PY 2001 VL 8 IS 4 BP 349 EP 352 DI 10.1038/86236 PG 4 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 416ZV UT WOS:000167811300020 PM 11276257 ER PT J AU Sakamoto, R Yamada, H Tanaka, K Narihara, K Morita, S Sakakibara, S Masuzaki, S Inagaki, S Baylor, LR Fisher, PW Combs, SK Gouge, MJ Kato, S Komori, A Kaneko, O Ashikawa, N de Vries, P Emoto, M Funaba, H Goto, M Ida, K Idei, H Ikeda, K Isobe, M Kado, S Kawahata, K Khlopenkov, K Kubo, S Kumazawa, R Minami, T Miyazawa, J Morisaki, T Murakami, S Muto, S Mutoh, T Nagayama, Y Nakamura, Y Nakanishi, H Nishimura, K Noda, N Notake, T Kobuchi, T Liang, Y Ohdachi, S Ohyabu, N Oka, Y Osakabe, M Ozaki, T Pavlichenko, RO Peterson, BJ Sagara, A Saito, K Sasao, H Sasao, M Sato, K Sato, M Seki, T Shimozuma, T Shoji, M Sudo, S Suzuki, H Takechi, M Takeiri, Y Tamura, N Toi, K Tokuzawa, T Torii, Y Tsumori, K Yamada, I Yamaguchi, S Yamamoto, S Yoshimura, Y Watanabe, KY Watari, T Yamazaki, K Hamada, Y Motojima, O Fujiwara, M AF Sakamoto, R Yamada, H Tanaka, K Narihara, K Morita, S Sakakibara, S Masuzaki, S Inagaki, S Baylor, LR Fisher, PW Combs, SK Gouge, MJ Kato, S Komori, A Kaneko, O Ashikawa, N de Vries, P Emoto, M Funaba, H Goto, M Ida, K Idei, H Ikeda, K Isobe, M Kado, S Kawahata, K Khlopenkov, K Kubo, S Kumazawa, R Minami, T Miyazawa, J Morisaki, T Murakami, S Muto, S Mutoh, T Nagayama, Y Nakamura, Y Nakanishi, H Nishimura, K Noda, N Notake, T Kobuchi, T Liang, Y Ohdachi, S Ohyabu, N Oka, Y Osakabe, M Ozaki, T Pavlichenko, RO Peterson, BJ Sagara, A Saito, K Sasao, H Sasao, M Sato, K Sato, M Seki, T Shimozuma, T Shoji, M Sudo, S Suzuki, H Takechi, M Takeiri, Y Tamura, N Toi, K Tokuzawa, T Torii, Y Tsumori, K Yamada, I Yamaguchi, S Yamamoto, S Yoshimura, Y Watanabe, KY Watari, T Yamazaki, K Hamada, Y Motojima, O Fujiwara, M TI Impact of pellet injection on extension of the operational region in LHD SO NUCLEAR FUSION LA English DT Article ID LARGE HELICAL DEVICE; ENERGY CONFINEMENT; ABLATION RATE; PLASMAS; DATABASE; MODEL AB Pellet injection has been used as a primary fuelling scheme in the Large Helical Device. With pellet injection, the operational region of NBI plasmas has been extended to higher densities while maintaining a favourable dependence of energy confinement on density, and several important values, such as plasma stored energy of 0.85 MJ, energy confinement time of 0.3 s, beta of 2.4% at 1.3 T and density of 1.1x10(20) m(-3), have been achieved. These parameters cannot be attained by gas puffing. Ablation and the subsequent behaviour of the plasma have been investigated. The measured pellet penetration depth estimated on the basis of the duration of the H-alpha emission is shallower than the depth predicted from the simple neutral gas shielding (NGS) model. It can be explained by the NGS model with inclusion of the effect of fast ions on the ablation. Just after ablation, the redistribution of the ablated pellet mass was observed on a short timescale (similar to 400 ms). The redistribution causes shallow deposition and low fuelling efficiency. C1 Natl Inst Fus Sci, Toki, Japan. Oak Ridge Natl Lab, Oak Ridge, TN USA. Grad Univ Adv Studies, Dept Fus Sci, Hayama, Japan. Nagoya Univ, Dept Energy Engn & Sci, Nagoya, Aichi, Japan. RP Sakamoto, R (reprint author), Natl Inst Fus Sci, Toki, Japan. RI Sakamoto, Ryuichi/E-7557-2013; Sakakibara, Satoru/E-7542-2013; Murakami, Sadayoshi/A-2191-2016; Ida, Katsumi/E-4731-2016; OI Sakamoto, Ryuichi/0000-0002-4453-953X; Sakakibara, Satoru/0000-0002-3306-0531; Murakami, Sadayoshi/0000-0002-2526-7137; Ida, Katsumi/0000-0002-0585-4561; Baylor, Larry/0000-0002-0325-7771 NR 17 TC 36 Z9 37 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD APR PY 2001 VL 41 IS 4 BP 381 EP 386 DI 10.1088/0029-5515/41/4/304 PG 6 WC Physics, Fluids & Plasmas SC Physics GA 449JZ UT WOS:000169682600004 ER PT J AU Turner, WC Burks, MT Datte, PS Manfredi, PF Millaud, JE Mokhov, NV Placidi, M Ratti, L Re, V Schmickler, H Speziali, V AF Turner, WC Burks, MT Datte, PS Manfredi, PF Millaud, JE Mokhov, NV Placidi, M Ratti, L Re, V Schmickler, H Speziali, V TI Development of a detector for bunch by bunch measurement and optimization of luminosity in the LHC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE luminosity; hadron collider; gas ionization chamber AB The front IR quadrupole absorbers (TAS) and the IR neutral particle absorbers (TAN) in the high-luminosity insertions of the LHC each absorb approximately 1.8 TeV of forward collision products on average per pp interaction (similar to 235 W at design luminosity 10(34) cm(-2) s(-1)). This secondary particle flux can be exploited to provide a useful storage ring operations tool for optimization of luminosity. Novel segmented, multi-gap, pressurized gas ionization chambers are proposed for sampling the energy deposited near the maxima of the hadronic:electromagnetic showers in these absorbers. The system design choices have been strongly influenced by optimization of signal-to-noise ratio and by the very high radiation environment. The ionization chambers are instrumented with state-of-the-art low noise, fast, pulse-shaping electronics capable of resolving individual bunch crossings at 40 MHz. Data on each bunch are separately accumulated over multiple bunch crossings until the desired statistical accuracy is obtained. At design luminosity of approximately 2 x 10(3) bunch crossings are sufficient for a 1% luminosity measurement. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Fermi Natl Accelerator Lab, Geneva, Switzerland. CERN, Geneva, Switzerland. Univ Pavia, I-27100 Pavia, Italy. Univ Bergamo, Bergamo, Italy. RP Turner, WC (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Ratti, Lodovico/I-8836-2012; OI RATTI, LODOVICO/0000-0003-1906-1076; Re, Valerio/0000-0003-0697-3420 NR 10 TC 10 Z9 10 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 APR 1 PY 2001 VL 461 IS 1-3 BP 107 EP 110 DI 10.1016/S0168-9002(00)01182-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800031 ER PT J AU Li, Z Dezillie, B Bruzzi, M Chen, W Eremin, V Verbitskaya, E Weilhammer, P AF Li, Z Dezillie, B Bruzzi, M Chen, W Eremin, V Verbitskaya, E Weilhammer, P TI HTLT oxygenated silicon detectors: radiation hardness and long-term stability SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY ID CHARGES N-EFF; GAMMA-RADIATION; NEUTRON AB Silicon detectors fabricated by BNLs high-temperature, long time (HTLT) oxidation technology have been characterized using various techniques for material/detector properties and radiation hardness with respect to gamma, proton and neutron irradiation. It has been found that a uniform oxygen distribution with a concentration of 4 x 10(17)/cm(3) has been achieved in high-resistivity FZ silicon with our HTLT technology. With the standard HTLT technology, the original high resistivity of FZ silicon will be retained. However, the controlled introduction of thermal donors (TD) with ii concentration higher than the original shallow doping impurity can be achieved with a process slightly altered from the standard HTLT technology (HTLT-TD). Detectors made by both technologies (HTLT and HTLT-TD) have been found to be advantageous in radiation hardness to gamma and proton irradiation, ill terms of detector full depletion voltage degradation, as compared to the control samples. In fact, these detectors are insensitive to gamma irradiation up to 600 Mrad and more tolerant by at least a factor of two to proton irradiation and the following reverse annealing. However, there is little improvement in radiation hardness to neutron irradiation, which has been attributed to the nature of neutron-induced damage that is dominated by extended defects or defect clusters. Microscopic measurements (I-DLTS) have also been made on control and HTLT samples and will be compared and presented. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. CERN, Geneva, Switzerland. Univ Florence, Florence, Italy. Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 196140, Russia. RP Li, Z (reprint author), Brookhaven Natl Lab, Bldg 510A-Star,POB 5000, Upton, NY 11973 USA. RI Verbitskaya, Elena/D-1521-2014; Bruzzi, Mara/K-1326-2015 OI Bruzzi, Mara/0000-0001-7344-8365 NR 13 TC 25 Z9 25 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 APR 1 PY 2001 VL 461 IS 1-3 BP 126 EP 132 DI 10.1016/S0168-9002(00)01187-6 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800036 ER PT J AU Takahashi, J Bellwied, R Beuttenmuller, R Caines, H Chen, W Dyke, H Hoffmann, GW Humanic, T Kotovc, I Kuczewski, P Leonhardt, W Li, Z Lynn, D Minor, R Munhoz, M Ott, G Pandey, SU Schambach, J Soja, R Sugarbaker, E Willson, RM AF Takahashi, J Bellwied, R Beuttenmuller, R Caines, H Chen, W Dyke, H Hoffmann, GW Humanic, T Kotovc, I Kuczewski, P Leonhardt, W Li, Z Lynn, D Minor, R Munhoz, M Ott, G Pandey, SU Schambach, J Soja, R Sugarbaker, E Willson, RM TI Silicon drift detectors, present and future prospects SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY ID STAR EXPERIMENT AB Silicon drift detectors provide unambiguous two-dimensional position information for charged particle detection with a single detector layer. A large area silicon drift detector was developed for the inner tracking detector of the STAR experiment at RHIC, In this paper, we discuss the lessons learned and the future prospects of this technology. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Instrumentat Div, Upton, NY 11973 USA. Wayne State Univ, Detroit, MI 48201 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Texas, Austin, TX 78712 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Takahashi, J (reprint author), Brookhaven Natl Lab, Instrumentat Div, Bldg 53B,POB 500, Upton, NY 11973 USA. RI Takahashi, Jun/B-2946-2012 OI Takahashi, Jun/0000-0002-4091-1779 NR 11 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 APR 1 PY 2001 VL 461 IS 1-3 BP 139 EP 142 DI 10.1016/S0168-9002(00)01190-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800038 ER PT J AU Nouicer, R Back, BB Betts, RR Gulbrandsen, KH Holzman, B Kucewicz, W Lin, WT Mulmenstadt, J van Nieuwenhuizen, GJ Pernegger, H Reuter, M Sarin, P Stephans, GSF Tsay, V Vale, CM Wadsworth, B Wuosmaa, AH Wyslouch, B AF Nouicer, R Back, BB Betts, RR Gulbrandsen, KH Holzman, B Kucewicz, W Lin, WT Mulmenstadt, J van Nieuwenhuizen, GJ Pernegger, H Reuter, M Sarin, P Stephans, GSF Tsay, V Vale, CM Wadsworth, B Wuosmaa, AH Wyslouch, B TI Silicon pad detectors for the PHOBOS experiment at RHIC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY ID QUARK-GLUON PLASMA AB The PHOBOS experiment is well positioned to obtain crucial information about relativistic heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC), combining a multiplicity counter with a multi-particle spectrometer. The multiplicity arrays will measure the charged-particle multiplicity over the full solid angle. The spectrometer will be able to identify particles at mid-rapidity. The experiment is constructed almost exclusively of silicon pad detectors. Detectors of nine different types are configured in the multiplicity and vertex detector (22,000 channels) and two multi-particle spectrometers (120,000 channels). The overall layout of the experiment, testing of the silicon sensors and the performance of the detectors during the engineering run at RHIC in 1999 an discussed. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Illinois, Dept Phys, Chicago, IL 60607 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. MIT, Cambridge, MA 02139 USA. Natl Cent Univ, High Energy Phys Grp, Chungli 32054, Taiwan. Miracle Technol Co Ltd, Hsinchu, Taiwan. RP Nouicer, R (reprint author), Univ Illinois, Dept Phys, 845 W Taylor St, Chicago, IL 60607 USA. RI Muelmenstaedt, Johannes/K-2432-2015; OI Muelmenstaedt, Johannes/0000-0003-1105-6678; Reuter, Michael/0000-0003-3881-8310 NR 6 TC 12 Z9 12 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 APR 1 PY 2001 VL 461 IS 1-3 BP 143 EP 149 DI 10.1016/S0168-9002(00)01191-8 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800039 ER PT J AU Casagrande, L Abreu, MC Bell, WH Berglund, P de Boer, W Borer, K Buontempo, S Chapuy, S Cindro, V D'Ambrosio, N Da Via, C Devine, S Dezillie, B Dimcovski, Z Eremin, V Esposito, A Granata, V Grigoriev, E Hauler, F Heijne, E Heising, S Janos, S Jungermann, L Konorov, I Li, Z Lourenco, C Mikuz, M Niinikoski, TO O'Shea, V Pagano, S Palmieri, VG Paul, S Pretzl, K Rato, P Ruggiero, G Smith, K Sonderegger, P Sousa, P Verbitskaya, E Watts, S Zavrtanik, M AF Casagrande, L Abreu, MC Bell, WH Berglund, P de Boer, W Borer, K Buontempo, S Chapuy, S Cindro, V D'Ambrosio, N Da Via, C Devine, S Dezillie, B Dimcovski, Z Eremin, V Esposito, A Granata, V Grigoriev, E Hauler, F Heijne, E Heising, S Janos, S Jungermann, L Konorov, I Li, Z Lourenco, C Mikuz, M Niinikoski, TO O'Shea, V Pagano, S Palmieri, VG Paul, S Pretzl, K Rato, P Ruggiero, G Smith, K Sonderegger, P Sousa, P Verbitskaya, E Watts, S Zavrtanik, M CA RD39 Collaboration TI Review on the development of cryogenic silicon detectors SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE lazarus; cryogenic; silicon; detectors AB In this paper, we report on the performance of heavily irradiated silicon detectors operated at cryogenic temperatures. The results discussed here show that cryogenic operation indeed represents a reliable method to increase the radiation tolerance of standard silicon detectors by more than one order of magnitude. In particular, a 400 mum thick "double-p" silicon detector irradiated up to 1 x 10(15) n/cm(2) delivers a mip signal of about 27 000 electrons when operated at 130 K and 500 V bias. The position resolution of an irradiated microstrip detector, and "in situ" irradiation of a pad detector during operation in the cold are also discussed. (C) 2001 Elsevier Science B.V. All rights reserved. C1 CERN, CH-1211 Geneva 23, Switzerland. LIP, P-1000 Lisbon, Portugal. Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. Helsinki Univ Technol, Low Temp Lab, FI-20150 Espoo, Finland. Univ Karlsruhe, IEKP, D-76128 Karlsruhe, Germany. Univ Bern, LHEP, CH-3012 Bern, Switzerland. Ist Nazl Fis Nucl, I-80100 Naples, Italy. Univ Naples, I-80100 Naples, Italy. Univ Geneva, Dept Radiol, CH-1211 Geneva, Switzerland. JSI, Expt Particle Phys Dept, Ljubljana 1001, Slovenia. Brunel Univ, Uxbridge UB8 3PH, Middx, England. Brookhaven Natl Lab, Upton, NY 11973 USA. Russian Acad Sci, Ioffe PTI, St Petersburg 194021, Russia. Tech Univ Munich, Dept Phys E18, D-85748 Garching, Germany. RP Casagrande, L (reprint author), CERN, CH-1211 Geneva 23, Switzerland. RI Zavrtanik, Marko/A-1524-2008; Rato Mendes, Pedro/F-8827-2010; Pagano, Sergio/C-5332-2008; Grigoriev, Eugene/K-6650-2013; O'Shea, Val/G-1279-2010; Verbitskaya, Elena/D-1521-2014; Paul, Stephan/F-7596-2015; Paul, Stephan/K-9237-2016; OI Zavrtanik, Marko/0000-0001-5606-6912; D'Ambrosio, Nicola/0000-0001-9849-8756; Rato Mendes, Pedro/0000-0001-9929-0869; Pagano, Sergio/0000-0001-6894-791X; Grigoriev, Eugene/0000-0001-7235-9715; O'Shea, Val/0000-0001-7183-1205; Paul, Stephan/0000-0002-8813-0437; Paul, Stephan/0000-0002-8813-0437; Abreu, Maria Conceicao/0000-0003-0093-7496 NR 5 TC 10 Z9 10 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 APR 1 PY 2001 VL 461 IS 1-3 BP 150 EP 154 DI 10.1016/S0168-9002(00)01192-X PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800040 ER PT J AU Juste, A AF Juste, A CA DO Collaboration TI The readout system for the silicon microstrip tracker of the upgraded DO detector SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY AB The Silicon Microstrip Tracker constitutes one of the key elements of the Dempty set upgrade, in order to fully exploit the physics potential of the Tevatron Run II. The tracker design is briefly overviewed before focusing on its readout system. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Juste, A (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 APR 1 PY 2001 VL 461 IS 1-3 BP 155 EP 157 DI 10.1016/S0168-9002(00)01193-1 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800041 ER PT J AU Bozzi, C Carassiti, V Ramusino, AC Dittongo, S Folegani, M Piemontese, L Abbott, BK Breon, AB Clark, AR Dow, S Fan, Q Goozen, F Hernikl, C Karcher, A Kerth, LT Kipnis, I Kluth, S Lynch, G Levi, M Luft, P Luo, L Nyman, M Pedrali-Noy, M Roe, NA Zizka, G Roberts, D Schieck, J Barni, D Brenna, E Defendi, I Forti, A Giugni, D Lanni, F Palombo, F Vaniev, V Leona, A Mandelli, E Manfredi, PF Perazzo, A Re, V Angelini, C Batignani, G Bettarini, S Bondioli, M Bosi, F Calderini, G Carpinelli, M Dutra, F Forti, F Gagliardi, D Giorgi, MA Lusiani, A Mammini, P Morganti, M Morsani, F Paoloni, E Profeti, A Rama, M Rampino, G Rizzo, G Sandrelli, F Simi, G Triggiani, G Tritto, S Vitale, R Burchat, P Cheng, C Kirkby, D Meyer, T Roat, C Bona, M Bianchi, F Daudo, F Di Girolamo, B Gamba, D Giraudo, G Grosso, P Romero, A Smol, A Trapani, P Zanin, D Bosisio, L Della Ricca, G Lanceri, L Pompili, A Poropat, P Prest, M Rastelli, C Vallazza, E Vuagnin, G Hast, C Potter, EP Sharma, V Burke, S Callahan, D Campagnari, C Dahmes, B Eppich, A Hale, D Hall, K Hart, P Kuznetsova, N Kyre, S Levy, S Long, O May, J Richman, J Verkerke, W Witherell, M Beringer, J Eisner, AM Frey, A Grillo, A Grothe, M Johnson, R Kroeger, W Lockman, W Pulliam, T Rowe, W Schmitz, R Seiden, A Spencer, E Turri, M Wilder, M Charles, E Elmer, P Nielsen, J Orejudos, W Scott, I Walsh, J Zobernig, H AF Bozzi, C Carassiti, V Ramusino, AC Dittongo, S Folegani, M Piemontese, L Abbott, BK Breon, AB Clark, AR Dow, S Fan, Q Goozen, F Hernikl, C Karcher, A Kerth, LT Kipnis, I Kluth, S Lynch, G Levi, M Luft, P Luo, L Nyman, M Pedrali-Noy, M Roe, NA Zizka, G Roberts, D Schieck, J Barni, D Brenna, E Defendi, I Forti, A Giugni, D Lanni, F Palombo, F Vaniev, V Leona, A Mandelli, E Manfredi, PF Perazzo, A Re, V Angelini, C Batignani, G Bettarini, S Bondioli, M Bosi, F Calderini, G Carpinelli, M Dutra, F Forti, F Gagliardi, D Giorgi, MA Lusiani, A Mammini, P Morganti, M Morsani, F Paoloni, E Profeti, A Rama, M Rampino, G Rizzo, G Sandrelli, F Simi, G Triggiani, G Tritto, S Vitale, R Burchat, P Cheng, C Kirkby, D Meyer, T Roat, C Bona, M Bianchi, F Daudo, F Di Girolamo, B Gamba, D Giraudo, G Grosso, P Romero, A Smol, A Trapani, P Zanin, D Bosisio, L Della Ricca, G Lanceri, L Pompili, A Poropat, P Prest, M Rastelli, C Vallazza, E Vuagnin, G Hast, C Potter, EP Sharma, V Burke, S Callahan, D Campagnari, C Dahmes, B Eppich, A Hale, D Hall, K Hart, P Kuznetsova, N Kyre, S Levy, S Long, O May, J Richman, J Verkerke, W Witherell, M Beringer, J Eisner, AM Frey, A Grillo, A Grothe, M Johnson, R Kroeger, W Lockman, W Pulliam, T Rowe, W Schmitz, R Seiden, A Spencer, E Turri, M Wilder, M Charles, E Elmer, P Nielsen, J Orejudos, W Scott, I Walsh, J Zobernig, H TI The BaBar Silicon Vertex Tracker SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY ID DESIGN AB The BaBar Silicon Vertex Tracker (SVT) is a five layer device, made from double-sided silicon strip detectors and read out via a custom time-over-threshold circuit, the AToM chip. The SVT is an essential part of the physics program of BaBar, and is able to reconstruct B mason decay vertices with a precision sufficient to measure time-dependent CP violating asymmetries at the PEP-II asymmetric e(+)e(-) collider. This report will give an overview of the SVT, with particular focus on the performance of the SVT, which has been taking colliding beam data since May 1999. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Wisconsin, Madison, WI 53706 USA. Ist Nazl Fis Nucl, Ferrara, Italy. Univ Ferrara, I-44100 Ferrara, Italy. Lawrence Berkeley Natl Lab, Berkeley, CA USA. Univ Maryland, College Pk, MD 20742 USA. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Univ Milan, Milan, Italy. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Univ Pavia, I-27100 Pavia, Italy. Univ Bergamo, Bergamo, Italy. Ist Nazl Fis Nucl, Pisa, Italy. Univ Pisa, Pisa, Italy. Stanford Univ, Stanford, CA 94305 USA. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, Turin, Italy. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Wisconsin, Madison, WI USA. RP Walsh, J (reprint author), Univ Wisconsin, Madison, WI 53706 USA. RI Rizzo, Giuliana/A-8516-2015; Forti, Francesco/H-3035-2011; Roe, Natalie/A-8798-2012; Lusiani, Alberto/N-2976-2015; Lusiani, Alberto/A-3329-2016; Della Ricca, Giuseppe/B-6826-2013; OI Cotta Ramusino, Angelo/0000-0003-1727-2478; Rizzo, Giuliana/0000-0003-1788-2866; PREST, MICHELA/0000-0003-3161-4454; Re, Valerio/0000-0003-0697-3420; Forti, Francesco/0000-0001-6535-7965; Lusiani, Alberto/0000-0002-6876-3288; Lusiani, Alberto/0000-0002-6876-3288; Della Ricca, Giuseppe/0000-0003-2831-6982; Bettarini, Stefano/0000-0001-7742-2998; Paoloni, Eugenio/0000-0001-5969-8712 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 APR 1 PY 2001 VL 461 IS 1-3 BP 162 EP 167 DI 10.1016/S0168-9002(00)01195-5 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800043 ER PT J AU Bolla, G Bortoletto, D Rott, C Roy, A Kwan, S Chien, CY Cho, H Gobbi, B Horisberger, R Kaufmann, R AF Bolla, G Bortoletto, D Rott, C Roy, A Kwan, S Chien, CY Cho, H Gobbi, B Horisberger, R Kaufmann, R TI Design and test of pixel sensors for the CMS experiment SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE pixel detectors; LHC AB The Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) will have a silicon pixel detector as its innermost tracking device. The pixel system will be exposed to the harsh radiation environment of the LHC. Prototype sensors have been designed to meet the specifications of the CMS experiment. The sensors are n(+)-n devices to allow partial depletion operation after bulk type inversion. The isolation of the n(+) pixels is provided through a novel double open p-ring design that allows sensors testing before bump bonding and flip chipping. The prototype wafers contain a variety of p-stop designs and are fabricated by two vendors on different bulk substrates including oxygenated silicon. A study of the static measurement of the prototype sensors before irradiation is presented. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Northwestern Univ, Dept Phys & Astron, Evanston, IL 60201 USA. Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland. RP Bortoletto, D (reprint author), Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. RI Kaufmann, Rolf/K-6422-2013 NR 2 TC 9 Z9 9 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 APR 1 PY 2001 VL 461 IS 1-3 BP 182 EP 184 DI 10.1016/S0168-9002(00)01201-8 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800048 ER PT J AU Granata, V da Via, C Watts, S Borer, K Janos, S Pretzl, K Dezillie, B Li, Z Casagrande, L Collins, P Grohmann, S Heijne, E Lourenco, C Niinikoski, TO Palmieri, VG Sonderegger, P Borchi, E Bruzzi, M Pirollo, S Chapuy, S Dimcovski, Z Grigoriev, E Bell, W Devine, SRH O'Shea, V Ruggiero, G Smith, K Berglund, P de Boer, W Hauler, F Heising, S Jungermann, L Abreu, M Mendes, PR Sousa, P Cindro, V Mikuz, M Zavrtanik, M Esposito, A Konorov, I Paul, S Buontempo, S D'Ambrosio, N Pagano, S Eremin, V Verbitskaya, E AF Granata, V da Via, C Watts, S Borer, K Janos, S Pretzl, K Dezillie, B Li, Z Casagrande, L Collins, P Grohmann, S Heijne, E Lourenco, C Niinikoski, TO Palmieri, VG Sonderegger, P Borchi, E Bruzzi, M Pirollo, S Chapuy, S Dimcovski, Z Grigoriev, E Bell, W Devine, SRH O'Shea, V Ruggiero, G Smith, K Berglund, P de Boer, W Hauler, F Heising, S Jungermann, L Abreu, M Mendes, PR Sousa, P Cindro, V Mikuz, M Zavrtanik, M Esposito, A Konorov, I Paul, S Buontempo, S D'Ambrosio, N Pagano, S Eremin, V Verbitskaya, E TI Cryogenic technology for tracking detectors SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY ID CHARGE COLLECTION EFFICIENCY; TEMPERATURES AB A low-mass cryogenic cooling technique for silicon sensor modules has been developed in the framework of the RD39 Collaboration at CERN. A prototype low-mass beam tracker cryostat has been designed, constructed and tested for applications in fixed target experiments. We shall report here briefly the main features and results of the system. (C) 2001 Elsevier Science B,V. All rights reserved. C1 Brunel Univ, Uxbridge UB8 3PH, Middx, England. Univ Bern, Lab Hochenergiephys, CH-3012 Bern, Switzerland. Brookhaven Natl Lab, Upton, NY 11973 USA. CERN, CH-1211 Geneva, Switzerland. Univ Florence, Dipartimento Energet, I-50139 Florence, Italy. Univ Geneva, Dept Radiol, CH-1211 Geneva, Switzerland. Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. Helsinki Univ Technol, Low Temp Lab, FI-02150 Espoo, Finland. Univ Karlsruhe, IEKP, D-76128 Karlsruhe, Germany. LIP, P-1000 Lisbon, Portugal. Jozef Stefan Inst, Expt Particle Phys Dept, Ljubljana 1001, Slovenia. Tech Univ Munich, Dept Phys E18, D-85748 Garching, Germany. Univ Naples Federico II, Dipartimento Fis, I-80125 Naples, Italy. Ist Nazl Fis Nucl, I-80125 Naples, Italy. Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia. RP Granata, V (reprint author), Brunel Univ, Uxbridge UB8 3PH, Middx, England. RI Zavrtanik, Marko/A-1524-2008; Rato Mendes, Pedro/F-8827-2010; Grigoriev, Eugene/K-6650-2013; O'Shea, Val/G-1279-2010; Verbitskaya, Elena/D-1521-2014; Bruzzi, Mara/K-1326-2015; Pagano, Sergio/C-5332-2008; Paul, Stephan/F-7596-2015; Paul, Stephan/K-9237-2016; Grohmann, Steffen/M-8671-2016; OI D'Ambrosio, Nicola/0000-0001-9849-8756; Zavrtanik, Marko/0000-0001-5606-6912; Rato Mendes, Pedro/0000-0001-9929-0869; Grigoriev, Eugene/0000-0001-7235-9715; O'Shea, Val/0000-0001-7183-1205; Bruzzi, Mara/0000-0001-7344-8365; Pagano, Sergio/0000-0001-6894-791X; Paul, Stephan/0000-0002-8813-0437; Paul, Stephan/0000-0002-8813-0437; Grohmann, Steffen/0000-0003-1298-5110; Abreu, Maria Conceicao/0000-0003-0093-7496 NR 2 TC 1 Z9 1 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 APR 1 PY 2001 VL 461 IS 1-3 BP 197 EP 199 DI 10.1016/S0168-9002(00)01205-5 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800052 ER PT J AU Affolder, A Barbaro-Galtieri, A Connolly, A Haber, C Zetti, F Bacchetta, N Bisello, D Gleziaski, D Goldstein, J Incandela, J Leonardi, G Colijn, AP Stuart, D Basti, A Chiarelli, G D'Onofrio, M Leone, S Munar-Ara, A Scuri, F Palmonari, F Tonelli, D Baroiant, S Caskey, W Grimm, G Hill, C Lander, R Wilkes, T AF Affolder, A Barbaro-Galtieri, A Connolly, A Haber, C Zetti, F Bacchetta, N Bisello, D Gleziaski, D Goldstein, J Incandela, J Leonardi, G Colijn, AP Stuart, D Basti, A Chiarelli, G D'Onofrio, M Leone, S Munar-Ara, A Scuri, F Palmonari, F Tonelli, D Baroiant, S Caskey, W Grimm, G Hill, C Lander, R Wilkes, T TI Construction report of the intermediate silicon layers (ISL) ladders SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY AB The Intermediate Silicon Layers (ISL) detector is part of the CDF upgrade for Run II. The ISL is a large radius (20-28 cm) double-side silicon tracker with a total active area of similar or equal to 3.5 m(2). The full procedure for module production and electrical tests is described. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Ist Nazl Fis Nucl, Sez Pisa, I-56010 Pisa, Italy. Ist Nazl Fis Nucl, Sez Padova, Padua, Italy. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Munar-Ara, A (reprint author), Ist Nazl Fis Nucl, Sez Pisa, Via Livornese 1291, I-56010 Pisa, Italy. RI Chiarelli, Giorgio/E-8953-2012; Hill, Christopher/B-5371-2012; OI Chiarelli, Giorgio/0000-0001-9851-4816; Hill, Christopher/0000-0003-0059-0779; Goldstein, Joel/0000-0003-1591-6014 NR 3 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 APR 1 PY 2001 VL 461 IS 1-3 BP 216 EP 218 DI 10.1016/S0168-9002(00)01212-2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800058 ER PT J AU Adler, C Denisov, A Garcia, E Murray, M Strobele, H White, S AF Adler, C Denisov, A Garcia, E Murray, M Strobele, H White, S TI The RHIC zero-degree calorimeters SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE heavy ions; calorimeter; luminosity ID COLLISIONS AB The RHIC zero-degree calorimeters provide common event characterization in the four heavy ion experiments which recently completed their first data taking run. Here, we describe simulations which lead to the design of these devices, teastbeam performance and initial experience at RHIC, (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Texas A&M Univ, College Stn, TX 77843 USA. Univ Maryland, College Pk, MD 20742 USA. IHEP, Protvino, Russia. Univ Frankfurt, IKF, D-6000 Frankfurt, Germany. RP White, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 43 Z9 43 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 APR 1 PY 2001 VL 461 IS 1-3 BP 337 EP 340 DI 10.1016/S0168-9002(00)01238-9 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800089 ER PT J AU Castoldi, A Gatti, E Guazzoni, C Longoni, A Rehak, P Struder, L AF Castoldi, A Gatti, E Guazzoni, C Longoni, A Rehak, P Struder, L TI The Controlled-Drift Detector: a new detector for fast frame readout X-ray imaging SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE Controlled-Drift Detector; X-ray imaging; fast read out; X-ray detectors ID PIXEL ARRAY DETECTOR; DIFFRACTION; CRYSTALLOGRAPHY; DEVICE AB The Controlled-Drift Detector (CDD) is a new X-ray imaging detector operated in integrate-readout mode. Its basic feature is the Fast transport of the integrated charge to the output electrode by means of a uniform drift field. The energy-resolved X-ray imaging capability of the CDD has been tested at room temperature. The images of a Fe-55 source taken with the CDD at different frame rates (up to 10 kHz) are presented and the achieved energy resolution is analyzed. A detector with such features can be of interest in several fields of application like time-resolved X-ray crystallography and astronomy. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Politecn Milan, I-20133 Milan, Italy. Brookhaven Natl Lab, Upton, NY 11973 USA. MPI Halbleiterlabor, D-81739 Munich, Germany. RP Guazzoni, C (reprint author), Politecn Milan, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy. RI Guazzoni, Chiara/A-5070-2008 OI Guazzoni, Chiara/0000-0001-6399-8670 NR 15 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 APR 1 PY 2001 VL 461 IS 1-3 BP 405 EP 409 DI 10.1016/S0168-9002(00)01259-6 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800106 ER PT J AU Manfredi, PF Manghisoni, M Ratti, L Re, V AF Manfredi, PF Manghisoni, M Ratti, L Re, V TI A bilinear analog compressor to adapt the signal dynamic range in the AUGER fluorescence detector SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE compressor; fluorescence detector; dynamic range AB A fluorescence detector, consisting in a PhotoMultiplier Tube (PMT) pixel camera, will be used in the AUGER experiment to study cosmic-ray sources with energies exceeding 10(18) eV. The front-end electronics transmits the PMT signals to the ADCs, retaining the timing and amplitude information carried by signals which span a wide (15-16 bits) dynamic range. The analog processing channel consists of a low-noise linear section, including an antialiasing filter, followed by a circuit of original conception, performing a high-accuracy bilinear compression of the signal dynamic range. This allows operation with a 12-bit ADC. Quantization errors can be minimized by correctly choosing the compression parameters. The paper presents the concepts the compressor is based upon, and the experimental behavior of a prototype version. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Bergamo, Dipartimento Ingn, I-24044 Dalmine, BG, Italy. Univ Pavia, Dipartimento Elettron, I-27100 Pavia, Italy. Ist Nazl Fis Nucl, Sezione Pavia, I-27100 Pavia, Italy. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Re, V (reprint author), Univ Bergamo, Dipartimento Ingn, Viale Marconi 5, I-24044 Dalmine, BG, Italy. RI Ratti, Lodovico/I-8836-2012; OI RATTI, LODOVICO/0000-0003-1906-1076; Re, Valerio/0000-0003-0697-3420; Manghisoni, Massimo/0000-0001-5559-0894 NR 4 TC 1 Z9 1 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 APR 1 PY 2001 VL 461 IS 1-3 BP 526 EP 529 DI 10.1016/S0168-9002(00)01291-2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800138 ER PT J AU Acosta, D Klimenko, S Konigsberg, J Korytov, A Mitselmakher, G Nguyele, A Nomerotski, A Safonov, A Stanek, R Tsybychev, D Vidal, R Wang, SM Wong, M AF Acosta, D Klimenko, S Konigsberg, J Korytov, A Mitselmakher, G Nguyele, A Nomerotski, A Safonov, A Stanek, R Tsybychev, D Vidal, R Wang, SM Wong, M TI The CDF Cherenkov luminosity monitor SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE Cherenkov; luminosity; detectors AB We have built a novel device for precision measurements of luminosity in the CDF experiment at the high p(p) over bar collision rates expected during Run II. The detector consists of long, conical, gaseous Cherenkov counters that point to the collision region and monitor the average number of inelastic p(p) over bar interactions by measuring the number of particles, and their arrival time, in each bunch crossing. For these primary particles, using isobutane at atmospheric pressure as a radiator, a large amount of Cherenkov light (similar to 100 photoelectrons) will be collected, with good amplitude and time resolutions, onto small and efficient PMTs. Suitable amplitude thresholds will be applied to discriminate from non-primary particles and other backgrounds which yield little light in the counters. This detector is expected to reliably perform bunch-by-bunch luminosity measurements at peak instantaneous luminosities of 2 x 10(32) cm(-2) s(-1) with six interactions per bunch crossing, on average, and respond to a 132 ns bunch spacing. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Florida, Gainesville, FL 32611 USA. Fermi Natl Lab, Batavia, IL USA. RP Konigsberg, J (reprint author), Univ Florida, Gainesville, FL 32611 USA. RI Nomerotski, Andrei/A-5169-2010 NR 6 TC 44 Z9 44 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 APR 1 PY 2001 VL 461 IS 1-3 BP 540 EP 544 DI 10.1016/S0168-9002(00)01294-8 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800141 ER PT J AU Lang, K Day, J Eilerts, S Fuqua, S Kordosky, M Vahle, PL Dervan, P Saakyan, R Thomas, J Barker, M Miyagawa, PS De Santo, A Weber, A Tzanakos, G Kim, H Michael, D Ignatenko, M Makeev, V Para, A Lee, R Bower, C Mufson, S Border, P Cushman, P Ruddick, K Schwienhorst, R Adamson, P Harris, PG Webb, RC Oliver, W Schneps, J AF Lang, K Day, J Eilerts, S Fuqua, S Kordosky, M Vahle, PL Dervan, P Saakyan, R Thomas, J Barker, M Miyagawa, PS De Santo, A Weber, A Tzanakos, G Kim, H Michael, D Ignatenko, M Makeev, V Para, A Lee, R Bower, C Mufson, S Border, P Cushman, P Ruddick, K Schwienhorst, R Adamson, P Harris, PG Webb, RC Oliver, W Schneps, J TI A comprehensive characterization of Hamamatsu 16-and 64-anode PMTs SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY DE multi-anode photomultipliers; extruded scintillator; fiber readout AB We are reporting preliminary results of studies of R59000-00-M16 and M64 tubes, manufactured by Hamamatsu Photonics, to he employed by the MINOS neutrino experiment. Our tests focused on anode response uniformity, gain, cross-talk, and linearity for light illuminating PMTs through a 1.2mm diameter fiber. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Texas, Austin, TX 78712 USA. UCL, London WC1E 6BT, England. Univ Oxford, Oxford OX1 3RH, England. Univ Athens, Athens 15571, Greece. CALTECH, Pasadena, CA 91125 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Harvard Univ, Cambridge, MA 02138 USA. Indiana Univ, Bloomington, IN 47405 USA. Univ Minnesota, Minneapolis, MN 55455 USA. Univ Sussex, Brighton BN1 9QH, E Sussex, England. Texas A&M Univ, College Stn, TX 77843 USA. Tufts Univ, Medford, MA 02155 USA. RP Univ Texas, Austin, TX 78712 USA. EM lang@hep.utexas.edu OI Weber, Alfons/0000-0002-8222-6681 NR 0 TC 7 Z9 7 U1 0 U2 1 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 APR 1 PY 2001 VL 461 IS 1-3 BP 571 EP 573 DI 10.1016/S0168-9002(00)01302-4 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800149 ER PT J AU Paus, C Grozis, C Kephart, R Stanek, R Kim, B Kim, DH Kim, SB Oh, Y Yu, I Carithers, W Kim, YK Anikeev, K Bauer, G Furic, IK Korn, A Kravchenko, I Mulhearn, M Pavlon, S Sumorok, K Cabrera, S Rodrigo, T Ruiz, A Vila, I Chen, C Jones, M Kononenko, W Kroll, J Mayers, GM Newcomer, FM Usynin, D VanBerg, R Bellettini, G Cerri, C Menzione, A Depedis, D Dionisi, C Giagu, S Rescigno, M Zanello, L Kazama, A Kim, SH Matsunaga, H Motohashi, S Sato, K Takikawa, K Ukegawa, F AF Paus, C Grozis, C Kephart, R Stanek, R Kim, B Kim, DH Kim, SB Oh, Y Yu, I Carithers, W Kim, YK Anikeev, K Bauer, G Furic, IK Korn, A Kravchenko, I Mulhearn, M Pavlon, S Sumorok, K Cabrera, S Rodrigo, T Ruiz, A Vila, I Chen, C Jones, M Kononenko, W Kroll, J Mayers, GM Newcomer, FM Usynin, D VanBerg, R Bellettini, G Cerri, C Menzione, A Depedis, D Dionisi, C Giagu, S Rescigno, M Zanello, L Kazama, A Kim, SH Matsunaga, H Motohashi, S Sato, K Takikawa, K Ukegawa, F TI Design and performance tests of the CDF time-of-flight system SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th Pisa Meeting on Advanced Detectors CY MAY 21-27, 2000 CL LA BIODOLA, ITALY AB The CDF II detector contains a time-of-flight detector consisting of 216 scintillator bars of 279cm length and 4 x 4 cm(2) cross-section located at a radius of 138 cm from the beam asis. The bars are installed on the inner surface of the CDF solenoid, which produces all axial field of 1.4 T. Nineteen-stage fine-mesh photomultiplier tubes are attached at both ends of the scintillator bars. Photostatistics limit the time-of-flight resolution, which is expected to be 100 ps. The primary physics motivation is K+/- identification for improved neutral B meson flavor determination. (C) 2001 Elsevier Science B.V. All rights reserved. C1 MIT, Cambridge, MA 02139 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. Univ Cantabria, CSIC, Santander, Spain. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Univ Rome La Sapienza, Ist Nazl Fis Nucl, Rome, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. RP Paus, C (reprint author), MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA. RI Ruiz, Alberto/E-4473-2011; Kim, Soo-Bong/B-7061-2014 OI Ruiz, Alberto/0000-0002-3639-0368; NR 3 TC 14 Z9 14 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 APR 1 PY 2001 VL 461 IS 1-3 BP 579 EP 581 DI 10.1016/S0168-9002(00)01305-X PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 430HE UT WOS:000168567800152 ER PT J AU Daulton, TL Kirk, MA Lewis, RS Rehn, LE AF Daulton, TL Kirk, MA Lewis, RS Rehn, LE TI Production of nanodiamonds by high-energy ion irradiation of graphite at room temperature SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab ID INDUCED DIAMOND FORMATION; CARBONACEOUS MATERIALS; FILMS; ONIONS AB It has previously been shown that graphite can be transformed into diamond by MeV electron and ion irradiation at temperatures above approximately 600 degreesC. However. there exists geological evidence suggesting that carbonaceous materials can be transformed to diamond by irradiation at substantially lower temperatures. For example, submicronsize diamond aggregates have been found in uranium-rich, Precambrian carbonaceous deposits that never experienced high temperature or pressure. To test if diamonds can be formed at lower irradiation temperatures. sheets of fine-grain polycrystalline graphite were bombarded at 20 degreesC with 350 +/- 50 MeV Kr ions to fluences of 6 x 10(12) cm(-2) using the Argonne tandem linear accelerator system (ATLAS). Ion-irradiated land unirradiated control) graphite specimens were then subjected to acid dissolution treatments to remove untransformed graphite and isolate diamonds that were produced; these acid residues were subsequently characterized by high-resolution and analytical electron microscopy. The acid residue of the ion-irradiated graphite was found to contain nanodiamonds, demonstrating that ion irradiation of graphite at ambient temperature can produce diamond. The diamond yield under our irradiation conditions is low, similar to0.01 diamonds/ion. An important observation that emerges from comparing the present result with previous observations of diamond formation during irradiation is that nanodiamonds form under a surprisingly R ide range of irradiation conditions. This propensity may be related to the very small difference in the graphite and diamond free-energies coupled with surface-energy considerations that may alter the relative stability of diamond and graphite at nanometer sizes. (C) 2001 Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. USN, Res Lab, Stennis Space Ctr, MS 39529 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. RP Rehn, LE (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 22 TC 36 Z9 36 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 12 EP 20 DI 10.1016/S0168-583X(00)00603-0 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100003 ER PT J AU Ridgway, MC Glover, CJ Desnica-Frankovic, ID Furic, K Yu, KM Foran, GJ Clerc, C Hansen, JL Larsen, AN AF Ridgway, MC Glover, CJ Desnica-Frankovic, ID Furic, K Yu, KM Foran, GJ Clerc, C Hansen, JL Larsen, AN TI Implantation-induced disorder in amorphous Ge: Production and relaxation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE amorphous; implantation; EXAFS; Raman; Ge ID MOLECULAR-DYNAMICS SIMULATION; CRYSTALLIZATION; GERMANIUM; DAMAGE; SI AB Extended X-ray absorption fine structure and Raman spectroscopy have been utilised to measure implantation-induced micro-structural modifications in amorphous Ge including increases in bond length, broadening of the bondangle distribution, and non-Gaussian static disorder as functions of ion dose. The resulting evolution of the interatomic distance distribution, over an ion dose range extending two orders of magnitude beyond that required for amorphisation, demonstrates the influence of implant conditions on amorphous phase structure. Results are attributed to increased fractions of three- and fivefold coordinated atoms as a means of accommodating implantation-induced point defects in the amorphous phase. In contrast, a common, ion-dose-independent structure is apparent following low-temperature, thermally-induced relaxation as consistent with the annealing of point defects in the amorphous phase. Structural relaxation is manifested by reductions in both bond-length and bond-angle distortion and the relaxation enthalpy for each component has been calculated separately. (C) 2001 Elsevier Science B,V. All rights reserved. C1 Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia. Rudjer Boskovic Inst, Dept Phys, Zagreb, Croatia. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA USA. Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia. CNRS, F-91405 Orsay, France. Aarhus Univ, Inst Phys & Astron, Aarhus, Denmark. RP Ridgway, MC (reprint author), Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia. RI Yu, Kin Man/J-1399-2012; Ridgway, Mark/D-9626-2011 OI Yu, Kin Man/0000-0003-1350-9642; Ridgway, Mark/0000-0002-0642-0108 NR 10 TC 5 Z9 5 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 21 EP 25 DI 10.1016/S0168-583X(01)00333-0 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100004 ER PT J AU Weber, WJ Jiang, W Thevuthasan, S AF Weber, WJ Jiang, W Thevuthasan, S TI Accumulation, dynamic annealing and thermal recovery of ion-beam-induced disorder in silicon carbide SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE amorphization; irradiation effects; thermal recovery; silicon carbide ID IRRADIATION-INDUCED AMORPHIZATION; CERAMICS; DAMAGE; BEHAVIOR AB Ion-beam-induced disordering in single crystals of 6H-SiC has been investigated for a wide range of ion species (from H+ to Au2-) using in situ ion-channeling methods. Silicon carbide is readily amorphized below room temperature with all ions. The rate of ion-beam-induced disordering decreases with decreasing ion mass and with increasing temperature. Analysis of limited data suggests that the activation energy for dynamic recovery during irradiation below 300 K is of the order of 0.1 eV. Thermal annealing indicates similar three-stage recovery on both the Si and C sublattices, which suggests similar recovery processes and activation energies. The activation energies for thermal recovery on the Si sublattice are estimated to be 0.3 +/- 0.15 eV (Stage I), 1.3 +/- 0.25 eV (Stage II) and 1.5 +/- 0.3 eV (Stage III). (C) 2001 Published by Elsevier Science B.V. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Weber, WJ (reprint author), Pacific NW Natl Lab, MSIN K8-93,POB 999, Richland, WA 99352 USA. RI Weber, William/A-4177-2008; OI Weber, William/0000-0002-9017-7365; Jiang, Weilin/0000-0001-8302-8313 NR 27 TC 42 Z9 43 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 26 EP 30 DI 10.1016/S0168-583X(00)00542-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100005 ER PT J AU Birtcher, RC Matsuo, J Yamada, I AF Birtcher, RC Matsuo, J Yamada, I TI Craters produced on Al, Cu and Au by Ar cluster impacts SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE cluster beam; impact; crater; metals; surface modification ID ION-BOMBARDMENT; SURFACES; GOLD AB Transmission electron microscopy has been used to observe craters produced on Al. Cu and Au at room temperature by the impact of Ar clusters. Irradiations were made at normal incidence with Ar clusters of either 100 or 1000 atoms having an energy of 100 keV. The probability of a cluster to make a crater decreases with increasing target atomic mass or density. At a given total energy, the probability of a cluster to make a crater increases with increasing cluster size. This increase in cratering rate with decreasing energy per atom in the cluster occurs because of greater energy deposition near the specimen surface due to increased rate of energy loss by individual atoms in the cluster. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Kyoto Univ, Ion Beam Engn Expt Lab, Sakyo Ku, Kyoto 606, Japan. RP Birtcher, RC (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 5 Z9 5 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 APR PY 2001 VL 175 BP 36 EP 39 DI 10.1016/S0168-583X(00)00626-1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100007 ER PT J AU Birtcher, RC Donnelly, SE Rehn, LE Thome, L AF Birtcher, RC Donnelly, SE Rehn, LE Thome, L TI Nanocluster formation during ion irradiation of SiO2/Ag/SiO2 multilayers SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE ion irradiation; nanocluster; multilayer; plastic flow ID METALLIC NANOPHASES; PLASTIC-FLOW; IMPLANTATION; GLASS; SIO2 AB Nanocluster formation during heavy ion bombardment of a thin contiguous Ag layer sandwiched between two continuous SiO2 layers has been observed using in situ transmisssion electron microscopy (TEM). During ion bom bardment, irradiation-induced plastic flow of the Ag film enlarges pre-existing pin holes and separates the film at grain boundaries transforming the as-deposited thin Ag film into three-dimensional microcrystals having diameters greater than 30 nm. This plastic flow process is similar to that observed in free-standing Ag specimens during heavy ion irradiation. In addition to plastic flow, ballistic recoils inject Ag atoms into the SiO2 where they precipitate into nanoclusters. Both effects are greatly enhanced by simultaneous electron and ion irradiation. (C) 2001 Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Salford, Joule Phys Lab, Salford M5 4WT, Lancs, England. CNRS, IN2P3, Ctr Spectrometrie Nucl & Spectrometrie Masse, F-91405 Orsay, France. RP Birtcher, RC (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. OI Donnelly, Stephen/0000-0002-9749-5550 NR 18 TC 3 Z9 3 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 40 EP 45 DI 10.1016/S0168-583X(00)00625-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100008 ER PT J AU Donnelly, SE Vishnyakov, VM Birtcher, RC Carter, G AF Donnelly, SE Vishnyakov, VM Birtcher, RC Carter, G TI The effects of radiation damage and impurities on void dynamics in silicon SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE voids; bubbles; helium; silicon; gettering ID SMALL-ANGLE CLEAVAGE; TRANSITION-METALS; ION-IMPLANTATION; INDUCED CAVITIES; C-SI; HELIUM; DIFFUSION; OXYGEN; MICROSCOPY AB Transmission electron microscopy (TEM) has been used to study the effects of implanted oxygen or carbon on the dynamics of cavity growth in silicon. The cavities are produced by implantation with helium ions followed by annealing to convert small He-filled bubbles into large empty voids. We have also investigated the effects of self-ion damage on cavity growth. Both impurities and self-ion damage can significantly inhibit void growth. In addition. hot stage TEM has been used to elucidate the processes responsible for cavity growth in an attempt to understand the way in which both impurities and radiation damage are able to modify these processes. Cavity growth is seen to be due to Ostwald ripening and coalescence in the early stages with some sporadic, rapid motion of large bubbles leading to coalescence at higher temperatures. Our research indicates that void dynamics in silicon are quite different from those in metallic systems. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Salford, Joule Phys Lab, Salford M5 4WT, Lancs, England. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Donnelly, SE (reprint author), Univ Salford, Joule Phys Lab, Salford M5 4WT, Lancs, England. OI Donnelly, Stephen/0000-0002-9749-5550; Vishnyakov, Vladimir/0000-0003-3045-3134 NR 28 TC 21 Z9 24 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 APR PY 2001 VL 175 BP 132 EP 139 DI 10.1016/S0168-583X(00)00612-1 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100025 ER PT J AU Hochbauer, T Misra, A Verda, R Zheng, Y Lau, SS Mayer, JW Nastasi, M AF Hochbauer, T Misra, A Verda, R Zheng, Y Lau, SS Mayer, JW Nastasi, M TI The influence of ion-implantation damage on hydrogen-induced ion-cut SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE ion-cut; implantation; fracture mechanics; silicon-on-insulator (SOI) ID INDUCED EXFOLIATION; SILICON; DIFFUSION; HISTORY; SPECTRA; STRESS AB Hydrogen ion-implantation in Si has been shown to be an effective means of cleaving thin layer of Si from its parent wafer. This process has been called smart-cut (TM), ion-cut, and hydrogen-slicing by various authors. Qualitatively it is known that implanted hydrogen in Si evolves under heating to form bubbles with high internal pressure, which then drives the cleavage process. The general belief has been that the bubbles, which induced the cleavage, occur at the peak in the H-implantation concentration profile. However, our recent experiments have shown that H bubble nucleation and the ultimate cleavage location in Si is controlled by the lattice damage that is generated by the H-implantation process. The stress and strain field in the proton-implantation-induced damage region of the silicon crystal is proposed to explain the observed results. (C) 2001 Published by Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Arizona State Univ, Tempe, AZ 85287 USA. RP Hochbauer, T (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Misra, Amit/H-1087-2012 NR 24 TC 15 Z9 15 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 169 EP 175 DI 10.1016/S0168-583X(00)00540-1 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100031 ER PT J AU Kalyanaraman, R Haynes, TE Yoon, M Larson, BC Jacobson, DC Gossmann, HJ Rafferty, CS AF Kalyanaraman, R Haynes, TE Yoon, M Larson, BC Jacobson, DC Gossmann, HJ Rafferty, CS TI Quantitative evolution of vacancy-type defects in high-energy ion-implanted Si: Au labeling and the vacancy implanter SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE Au labeling; high-energy ion implantation; excess vacancies; vacancy implanter; RBS; Si ID SILICON; DIFFUSION; CLUSTERS AB In ion implantation related research in Si, the role of interstitial clusters in dopant diffusion is fairly well understood. But there is relatively poor understanding of vacancy clusters, mainly due to the inadequacy of present techniques to profile and especially to count vacancy defects. Recently, two important steps have been taken in the direction of understanding the vacancy-type defects. The first is the demonstration that high-energy ion implantation (HEI) can be used as a vacancy implanter to introduce vacancies (V) in Si that are separated from the interstitials (I) by relying on spatial separation of the Frenkel pairs due to the average forward momentum of the recoils. The second is the development of two techniques, Au labeling and cross-section X-ray microbeam diffuse scattering which permit quantitative measurements of the vacancy-type defect clusters and their depth distribution. In this work we highlight the Au labeling technique and use the vacancy implanter in conjunction with Au labeling to study the evolution of excess vacancy defects (V-ex) created by HEI of Si+ in Si(1 0 0) as a function of fluence and temperature. We show that a precise injection of V-ex is possible by controlling implanted fluence. We also show that the V-ex clusters formed by the HEI are extremely stable and their annihilation is governed by interstitial injection rather than vacancy emission in the temperature range of 800-900 degreesC. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Bell Labs, Lucent technol, Murray Hill, NJ 07974 USA. RP Kalyanaraman, R (reprint author), Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RI Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 16 TC 13 Z9 13 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 182 EP 186 DI 10.1016/S0168-583X(00)00662-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100033 ER PT J AU Tchebotareva, AL Brebner, JL Roorda, S White, CW AF Tchebotareva, AL Brebner, JL Roorda, S White, CW TI Properties of InAs nanocrystals in silicon formed by sequential ion implantation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE InAs nanocrystals; sequential ion implantation; XRD; photoluminescence ID GE NANOCRYSTALS; VISIBLE LUMINESCENCE; ROOM-TEMPERATURE; BEAM SYNTHESIS; SI; PHOTOLUMINESCENCE; LAYERS; GLASS AB Optical and structural properties of InAs nanocrystals fabricated by co-implantation of In and As ions in Si-c(1 0 0), followed by thermal annealing are investigated. In the first sample named Si/AsIn the implantation of As ions was followed by In ion implantation, whereas in the second sample named Si/InAs the order of implantation was inverted. RES spectra of these samples taken before and after annealing show that the depth profiles of implanted ions depend strongly on the order of implantation. XRD measurements confirm the presence of InAs crystallites oriented along the crystallographic axes of the silicon matrix irrespective of the order of implantation. Low-temperature photoluminescence measurements show a large PL band in the region 0.83-1.03 eV for the sample Si/AsIn. No PL was observed in the sample Si/InAs. The optical absorption spectrum of Si/AsIn sample shows a large absorption band in the region 0.4-0.9 eV, whereas the spectrum of sample Si/InAs contains two distinct absorption bands at 0.45 eV and 0.8 eV. This may indicate a bimodal distribution of sizes of InAs nanocrystals in the Si/InAs sample. The absorption and photoluminescence bands arise from the blueshifted bandgap absorption/emission of InAs nanocrystals, this blueshift being dependent on the size of the nanocrystals. These results indicate that in the case of As ions implanted first, the InAs nanocrystals are smaller than for the case of In ions implanted first. This effect may be explained by the low solubility of In ions in the silicon matrix, which results in agglomeration of In ions during the implantation. When As ions are implanted afterwards, the In clusters are partially transformed into InAs nanocrystals which grow in size during the annealing. Hence, the order of ion implantation is found to influence the size and distribution of the resultant nanocrystals, as well as the optical properties of the samples obtained. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Montreal, Res Grp Phys & Technol Thin Films, Dept Phys, Montreal, PQ H3C 3J7, Canada. Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Tchebotareva, AL (reprint author), Univ Montreal, Res Grp Phys & Technol Thin Films, Dept Phys, Montreal, PQ H3C 3J7, Canada. RI Roorda, Sjoerd/N-2604-2014 NR 18 TC 23 Z9 23 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 187 EP 192 DI 10.1016/S0168-583X(00)00660-1 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100034 ER PT J AU Ridgway, MC Glover, CJ Yu, KM Foran, GJ Lee, TW Moon, Y Yoon, E AF Ridgway, MC Glover, CJ Yu, KM Foran, GJ Lee, TW Moon, Y Yoon, E TI Structural characterisation of amorphised compound semiconductors SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE amorphous; implantation; EXAFS; GaAs; InP ID ION-IMPLANTATION; DISORDER; DEFECTS; EXAFS; GAAS AB Extended X-ray absorption fine structure (EXAFS) has been utilized to measure implantation-induced structural modifications in amorphous GaAs and InP. Relative to crystalline standards, increases in bond length were apparent for both materials. However, the constituent atoms were under- and over-coordinated in amorphous GaAs and InP, respectively, as consistent with the reported decrease and increase in density, respectively. For GaAs, experimental evidence for the presence of homopolar bonding ill the amorphous phase was apparent though the similarity in atomic number of the two constituents inhibited a quantitative determination. Tn contrast, homopolar bonding ill amorphous InP was readily measurable - In-In bonding comprised similar to 14% of the total In bonds. For amorphous GaAs, all structural parameters were independent of ion dose and implantation temperature as consistent with an intrinsic rather than an implant-specific extrinsic structure. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Australian Natl Univ, Res Sch Phys Sci & Engn, Dept Elect Mat Engn, Canberra, ACT, Australia. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia. Seoul Natl Univ, Sch Mat Sci & Engn, Seoul, South Korea. RP Ridgway, MC (reprint author), Australian Natl Univ, Res Sch Phys Sci & Engn, Dept Elect Mat Engn, Canberra, ACT, Australia. RI Yu, Kin Man/J-1399-2012; Ridgway, Mark/D-9626-2011 OI Yu, Kin Man/0000-0003-1350-9642; Ridgway, Mark/0000-0002-0642-0108 NR 19 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 280 EP 285 DI 10.1016/S0168-583X(01)00340-8 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100051 ER PT J AU Barbour, JC Braithwaite, JW Wright, AF AF Barbour, JC Braithwaite, JW Wright, AF TI Determination of solid-state sulfidation mechanisms in ion-implanted copper SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE implantation; irradiation; corrosion mechanisms; copper sulfidation; density-functional theory ID MOLECULAR-DYNAMICS; CORROSION; ALUMINUM; METALS AB Ion-beam irradiation and ion implantation were used to evaluate the influence of point defects and alloying elements on the sulfidation rate of copper films in atmospheric environments containing H2S. Low-energy ions from an oxygen plasma were used to grow thin metal oxide passivation layers on Cu films that were subsequently irradiated and exposed to sulfidizing environments (50-600 ppb H2S in air with 0.5-85% relative humidity). The type of oxide proved to be important in that a CuO layer essentially prevented sulfidation whereas a Cu2O layer permitted sulfidation. For the native copper oxide (Cu2O), density-functional theory modeling of Cu divacancy binding energies suggested that alloying with In or Al would cause vacancy trapping and possibly slow the rate of sulfidation. This finding was then experimentally verified for an In-implanted Cu film. A series of marker experiments using unalloyed Cu showed that sulfidation proceeds by solid-state transport of Cu from the substrate through the Cu2S product layer. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, MS 1415,Org 01112, Albuquerque, NM 87185 USA. EM jcbarbo@sandia.gov NR 12 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X EI 1872-9584 J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 382 EP 387 DI 10.1016/S0168-583X(00)00682-0 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100069 ER PT J AU Lam, NQ Okamoto, PR Heuer, JK AF Lam, NQ Okamoto, PR Heuer, JK TI Applications of disorder-induced melting concept to critical-solute-accumulation processes SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE amorphization; atomic disorder; ion implantation; melting; segregation; fracture ID FRACTURE MODE TRANSITION; INTERGRANULAR FRACTURE; NICKEL; AMORPHIZATION; IMPLANTATION; SEGREGATION; ALLOYS; STATE AB A generalized version of the Lindemann melting criterion has recently been used to develop a unified thermodynamic description of disorder-induced amorphization and heat-induced melting. This concept of amorphization as a melting process is based on the fact that the melting temperature of a defective crystal driven far from equilibrium will decrease relative to that of its defect-free equilibrium state. The broader view of melting provides a new perspective of damage-accumulation processes such as radiation damage, ion implantation, ion beam mixing, plastic deformation, and fracture. For example, within this conceptual framework, disorder-induced amorphization is simply polymorphous melting of a critically disordered crystal at temperatures below the glass transition temperature. In the present communication, we discuss the application of the concept to two specific cases: amorphous phase formation during ion implantation and solute segregation-induced intergranular fracture. (C) 2001 Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Lam, NQ (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 18 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 388 EP 393 DI 10.1016/S0168-583X(00)00538-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100070 ER PT J AU Motta, AT Paesano, A Birtcher, RC Amaral, L AF Motta, AT Paesano, A Birtcher, RC Amaral, L TI Grain growth in Zr-Fe multilayers under in situ ion irradiation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE grain growth; ion irradiation; charged particles; metallic multilayers ID THIN-FILMS AB Transmission electron microscopy (TEM) observations during in situ ion irradiation were used to study grain growth in free-standing Zr-Fe thin film multilayers at 25 and 300 K. Irradiations were performed with three different types of ions: 100 keV Ar, 300 keV Kr and 500 keV Xe ions to fluences of 3 x 10(15) ion cm(-2). Grain growth during irradiation at 20 K occurs at a similar rate to that at 300 K. At both temperatures the grain growth rate was proportional to the total number of displacements, regardless of the ion used for the irradiation. We discuss these results in terms of two previous models for grain growth under irradiation. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA. Univ Estadual Maringa, Dept Fis, Maringa, Parana, Brazil. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Fed Rio Grande Sul, Inst Fis, BR-90046900 Porto Alegre, RS, Brazil. RP Motta, AT (reprint author), Penn State Univ, Dept Mech & Nucl Engn, 227 Rebek Bldg, University Pk, PA 16802 USA. NR 8 TC 4 Z9 5 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 521 EP 525 DI 10.1016/S0168-583X(00)00644-3 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100095 ER PT J AU Moura, CS Motta, AT Lam, NQ Amaral, L AF Moura, CS Motta, AT Lam, NQ Amaral, L TI Point defect energetics in the ZrNi and Zr2Ni intermetallics SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab ID INDUCED AMORPHIZATION; ELECTRON-IRRADIATION; SIMULATION; NIZR2 AB A systematic study of the properties of point defects has been conducted in the ZrNi and Zr2Ni intermetallic compounds using molecular dynamics. These properties include the stable defect configurations, formation and migration energies, and vacancy migration mechanisms. Zr vacancies (interstitials) are unstable in both compounds; they spontaneously decay to pairs of Ni vacancy (interstitial) and antisite defect. The stable Ni vacancies have formation energies of 0.83 and 0.61 eV in ZrNi and Zr2Ni, respectively. In ZrNi, vacancy migration occurs preferentially in the [0 2 5] and [1 0 0] directions, with migration energies of 0.67 and 0.73 eV, respectively, and is essentially a two-dimensional process, in the (0 0 1) plane. In Zr2Ni, vacancy migration is one-dimensional, occurring in the [0 0 1] direction, with a migration energy of 0.67 eV, The stable interstitial configurations for both compounds consist of a Ni atom lying on the (001) plane between two out-of-plane nearest-neighbor Zr atoms. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Fed Rio Grande Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil. Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Amaral, L (reprint author), Univ Fed Rio Grande Sul, Inst Fis, Caixa Postal 15051,Av Bento Goncalves,9500, BR-91501970 Porto Alegre, RS, Brazil. RI Moura, Cassio/E-2604-2013 NR 6 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 526 EP 531 DI 10.1016/S0168-583X(00)00535-8 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100096 ER PT J AU Peters, AM He, XM Trkula, M Nastasi, M AF Peters, AM He, XM Trkula, M Nastasi, M TI Annealing of chromium oxycarbide coatings deposited by plasma immersion ion processing (PIIP) for aluminum die casting SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE plasma immersion ion processing; MOCVD; oxidation; aluminum die casting; non-wetting; resonant ion backscattering spectroscopy ID PACVD AB Chromium oxycarbide coatings have been investigated for use as non-wetting coatings for aluminum die casting. This paper examines Cr-C-O coating stability and non-wetability at elevated temperatures for extended periods. Coatings were deposited onto 304 stainless steel from chromium carbonyl [Cr(CO)(6)] by plasma immersion ion processing. The coatings were annealed in air at an aluminum die casting temperature of 700 degreesC up to 8 h. Coatings were analyzed using resonant ion backscattering spectroscopy, nanoindentation and pin-on-disk tribometry. Molten aluminum was used to determine coating wetting and contact angle. Results indicate that the surface oxide layer reaches a maximum thickness of 900 nm. Oxygen concentrations in the coatings increased from 24% to 34%, while the surface concentration rose to almost 45%. Hardness values ranged from 22.1 to 6.7 GPa, wear coefficients ranged from 21 to 8 x 10(-6) mm(3)/Nm and contact angles ranged from 156 degrees to 127 degrees. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA. RP Peters, AM (reprint author), Univ Calif Los Alamos Natl Lab, Mat Sci & Technol Div, POB 1663,MST-8,Mail Stop G755, Los Alamos, NM 87545 USA. NR 13 TC 2 Z9 2 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 APR PY 2001 VL 175 BP 599 EP 604 DI 10.1016/S0168-583X(00)00598-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100110 ER PT J AU Jiang, W Weber, WJ Thevuthasan, S AF Jiang, W Weber, WJ Thevuthasan, S TI Damage accumulation and recovery in gold-ion-irradiated barium titanate SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE ion irradiation; damage accumulation; disorder recovery; barium titanate ID OXIDES; SRTIO3 AB Single-crystal barium titanate (BaTiO3) wafers were irradiated 60 degrees off the surface normal at 170 and 300 K using 1.0 MeV Au2+ ions over a fluence range from 0.03 to 0.19 ions/nm(2). Disorder on both the Ba and Ti sublattices has been studied in situ using Rutherford backscattering spectrometry along the <1 1 0 > axial direction. At these irradiation temperatures, the temperature dependence of disordering is small. The dose for amorphization under these conditions is on the order of 0.5 dpa, which is 50% of that required to amorphize SrTiO3 under similar conditions. At low damage levels, recovery of disorder is observed at room temperature, suggesting at least one lower temperature recovery stage. For more highly damaged states, two distinct recovery stages have been identified between 420 and 570 K and between 720 and 870 K. The recovery stage between 420 and 570 K is associated with the critical temperature for full amorphization (similar to 550 K) in BaTiO3. The higher temperature recovery stage is most likely associated with epitaxial recrystallization. (C) 2001 Published by Elsevier Science B.V. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Weber, WJ (reprint author), Pacific NW Natl Lab, MS K8-93,POB 999, Richland, WA 99352 USA. RI Weber, William/A-4177-2008; OI Weber, William/0000-0002-9017-7365; Jiang, Weilin/0000-0001-8302-8313 NR 12 TC 4 Z9 4 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 175 BP 610 EP 614 DI 10.1016/S0168-583X(01)00450-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100112 ER PT J AU Misra, A Nastasi, M AF Misra, A Nastasi, M TI Intrinsic residual stresses in metal films synthesized by energetic particle deposition SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12th International Conference on Ion Beam Modification of Materials (IBMM2000) CY SEP 03-08, 2000 CL CANELA, BRAZIL SP Inst Fis UFRGS, Ion Implantat Lab DE residual stress; metal thin films; ion-beam synthesis; interatomic potentials ID THIN-FILMS; EVOLUTION AB Residual stresses are intrinsic to all physical vapor deposited coatings. Bombardment with energetic particles lions or neutrals) has a strong influence on both the sign and the magnitude of intrinsic stresses. For example, stresses can change from large tensile to large compressive with increasing particle bombardment. We develop a model for the evolution of tensile residual stress with increasing bombardment based on the hypothesis that the tensile stresses originate due to the attractive interatomic forces between the coalescing crystallites. The model predictions are shown to compare favorably with experimental results. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Misra, A (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS K765, Los Alamos, NM 87545 USA. RI Misra, Amit/H-1087-2012 NR 11 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 APR PY 2001 VL 175 BP 688 EP 693 DI 10.1016/S0168-583X(00)00537-1 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 444FH UT WOS:000169389100127 ER PT J AU Takacs, S Szelecsenyi, F Tarkanyi, F Sonck, M Hermanne, A Shubin, Y Dityuk, A Mustafa, MG Zhuang, YX AF Takacs, S Szelecsenyi, F Tarkanyi, F Sonck, M Hermanne, A Shubin, Y Dityuk, A Mustafa, MG Zhuang, YX TI New cross-sections and intercomparison of deuteron monitor reactions on Al, Ti, Fe, Ni and Cu SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article DE recommended cross-section; monitor reactions; deuteron; Al-27(d,x)Na-22; Al-27(d,x)Na-24; Ti-nat(d,x)V-48; Fe-nat(d,x)Co-56; Ni-nat(d,x)Cu-61; Cu-nat(d,x)Zn-65 processes ID INDUCED NUCLEAR-REACTIONS; EXCITATION-FUNCTIONS; ALTERNATIVE ROUTE; MO-NAT; ACTIVATION; DECAY; MO-99 AB The Al-27(d,x)Na-22,Na-24 reactions are frequently used to monitor deuteron beams above 20 MeV. To extend possible monitoring energy region toward lower energies, new monitor reactions are proposed and experimental cross-sections are measured for the processes Al-27(d,x)Na-22,Na-24, Ti-nat(d,x)V-48, Fe-nat(d,x)Co-56, Ni-nat(d,x)Cu-61 and Cu-nat(d,x)Zn-65. The excitation functions were studied using the activation method on stacks of thin metallic foil targets with natural isotopic composition. The data sets of the six processes were cross-checked with each other to provide reliable numerical cross-sections. Detailed literature compilation and critical comparison were made on the available data sets for the studied reactions. Predictions of model calculations were compared with the new experimental data. After establishing selection criteria, consistent data sets were chosen for each of the processes, which were then fitted with a spline or Pade method to provide recommended cross-sections. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Nucl Res Inst, Cyclotron Dept, H-4026 Debrecen, Hungary. Free Univ Brussels, Cyclotron Dept, Brussels, Belgium. Inst Phys & Power Engn, Obninsk, Russia. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. China Inst Atom Energy, China Nucl Data Ctr, Beijing, Peoples R China. RP Takacs, S (reprint author), Nucl Res Inst, Cyclotron Dept, Bem Ter 18-C, H-4026 Debrecen, Hungary. NR 53 TC 62 Z9 62 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 2001 VL 174 IS 3 BP 235 EP 258 DI 10.1016/S0168-583X(00)00589-9 PG 24 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 411UA UT WOS:000167516600002 ER PT J AU Reyna, D AF Reyna, D TI Diffractive production of real photons SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 1st International Workshop on Diffraction in High-Energy Physics CY SEP 02-07, 2000 CL CETRARO, ITALY AB The process eP --> eP gamma has been investigated by both the H1 and ZEUS collaborations at HERA. Contributions beyond the normal QED Bethe-Heitler process have been seen within the measurable kinematic range. These contributions are consistent with a calculation of Deeply Virtual Compton Scattering. A cross section, differential in Q(2) or W, has been measured by the H1 collaboration and compared with this calculation. C1 DESY, FH1, D-22607 Hamburg, Germany. RP Reyna, D (reprint author), Argonne Natl Lab, HEP Div, 9700 S Cass Ave, Argonne, IL 60439 USA. 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 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 99A BP 109 EP 112 DI 10.1016/S0920-5632(01)01316-0 PG 4 WC Physics, Particles & Fields SC Physics GA 426QX UT WOS:000168360800020 ER PT J AU Suzuki, K Itakura, K AF Suzuki, K Itakura, K TI Constraints on color dipole-nucleon cross section from diffractive heavy quarkonium production SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 1st International Workshop on Diffraction in High-Energy Physics CY SEP 02-07, 2000 CL CETRARO, ITALY ID DEEP-INELASTIC SCATTERING; ART. NO. 031501; QCD; ELECTROPRODUCTION; PHOTOPRODUCTION AB We study the hard color dipole-nucleon cross section within perturbative QCD and discuss its relation to observables in diffractive leptoproduction of heavy quarkonium. The dipole cross section calculated with the unintegrated gluon density of the nucleon substantially differs from the well-known perturbative farm sigma (dip) similar to b(2) for b > 0.3fm, where b is the transverse separation of the dipole. We show the measured ratio of psi ' to J/psi, photoproduction cross sections constrains the dipole cross section at intermediate b, and in fact excludes the simple sigma (dip) similar to b(2) behavior. We also calculate the t-slopes of the diffractive J/psi, psi ' productions. We emphasize the difference of t-slopes, B-J/psi - B-psi ', is dominated by the dipole-nucleon dynamics. This difference is found to be about 0.3GeV(-2) with our dipole cross section. C1 Univ Tokyo, Dept Phys, Tokyo 1130033, Japan. Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. RP Suzuki, K (reprint author), Univ Tokyo, Dept Phys, 7-3-1 Hongo, Tokyo 1130033, Japan. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 99A BP 230 EP 233 DI 10.1016/S0920-5632(01)01340-8 PG 4 WC Physics, Particles & Fields SC Physics GA 426QX UT WOS:000168360800044 ER PT J AU Guryn, W AF Guryn, W TI The future of diffraction at RHIC SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 1st International Workshop on Diffraction in High-Energy Physics CY SEP 02-07, 2000 CL CETRARO, ITALY ID PROTON ELASTIC-SCATTERING; TOTAL CROSS-SECTIONS; SPIN DEPENDENCE; HADRONIC INTERFERENCE; HIGH-ENERGIES; PP AB The future of diffraction program at the Relativistic Heavy Ion Collider (RHIC) is discussed. Most of the program is associated with an approved experiment Total and Differential Cross Sections and Polarization Effects in pp Elastic Scattering at RHIC, PP2PP experiment. In the medium \t\ range, diffractive region, with four momenta transferred 0.006 < \t\ < 1.3(GeV/c)(2), the experiment will address one of the main, unsolved problems in particle and nuclear physics: long-range QCD and confinement. In the small \t\ range, Coulomb Nuclear Interference (CNI), 0.0004 < \t\ < 0.12 (GeV/c)(2), the experiment will, in a model-independent way, test general analytical properties of scattering amplitudes: analyticity, unitarity, and crossing symmetry. In addition, by measuring single spin asymmetries such as A(N), double spin correlation parameter A(NN), and cross section difference Delta sigma (T) = sigma (tot)(up arrow, down arrow) - sigma (tot)(up arrow, up arrow), we will be able to determine the helicity amplitudes phi (i). Those amplitudes are not well known now, so their systematic study at RHIC will help to understand the spin structure of the nucleon and of the exchanged mediators of the force, Pomeron and Odderon. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Guryn, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 41 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 99A BP 299 EP 308 DI 10.1016/S0920-5632(01)01350-0 PG 10 WC Physics, Particles & Fields SC Physics GA 426QX UT WOS:000168360800054 ER PT J AU Baller, B AF Baller, B CA DONUT collaboration TI Direct observation of the tau neutrino SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 6th International Workshop on Tau Lepton Physics CY SEP 18-21, 2000 CL VICTORIA, CANADA AB The DONUT experiment has observed four events in a hybrid emulsion spectrometer detector due to nu N-tau interactions in a hybrid emulsion spectrometer. The produced tau leptons are identified by the decay tau --> one charged particle. The expected background is 0.41 +/- 0.15 events from mis-tagged charm decays and secondary interactions of neutral current interactions. The poisson probability that the four events are due to these background processes is 8x10(-4). C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Baller, B (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 98 BP 43 EP 47 PG 5 WC Physics, Particles & Fields SC Physics GA 424AY UT WOS:000168211000006 ER PT J AU Robertson, SH AF Robertson, SH TI Charged current review SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 6th International Workshop on Tau Lepton Physics CY SEP 18-21, 2000 CL VICTORIA, CANADA ID LEPTONIC BRANCHING FRACTIONS; RADIATIVE-CORRECTIONS; DECAY TAU->PI(K)NU(TAU); TAU-DECAY; NEUTRINO; RATIO AB Experimental measurements of the tau lifetime and leptonic branching ratios are combined to give updated world averages for these quantities. The results are then used to test the universality of the electroweak charged current couplings to the three lepton species and are found to be consistent with Standard Model predictions at the level of 0.2%, permitting limits to be derived on non-Standard Model physics such as the mass of the tau neutrino. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Robertson, SH (reprint author), Stanford Linear Accelerator Ctr, MS 61,POB 4349, Stanford, CA 94309 USA. NR 19 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 98 BP 67 EP 74 DI 10.1016/S0920-5632(01)01196-3 PG 8 WC Physics, Particles & Fields SC Physics GA 424AY UT WOS:000168211000009 ER PT J AU Merino, C Brodsky, SJ Rathsman, J AF Merino, C Brodsky, SJ Rathsman, J TI Jet asymmetry in high energy diffractive production SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT QCD 2000 Euroconference CY JUL 06-13, 2000 CL MONTPELLIER, FRANCE SP QCD ID DEEP-INELASTIC-SCATTERING; LARGE RAPIDITY GAP; ELASTIC-SCATTERING; ODDERON INTERCEPT; PERTURBATIVE QCD; HERA; PHOTOPRODUCTION; DISSOCIATION; POMERON; EVENTS AB We propose the asymmetry in the fractional energy of charm versus anticharm jets produced in high energy diffractive photoproduction as a sensitive test of the interference of the Odderon (C = -) and Pomeron (C = +) exchange amplitudes in QCD, that, if measured at HERA, could provide the first experimental evidence of the Odderon. C1 Univ Santiago de Compostela, Dept Fis & Particulas, Santiago De Compostela 15706, Spain. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. CERN, Div TH, CH-1211 Geneva, Switzerland. RP Merino, C (reprint author), Univ Santiago de Compostela, Dept Fis & Particulas, Campus Univ S-N, Santiago De Compostela 15706, Spain. NR 34 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 96 BP 141 EP 145 DI 10.1016/S0920-5632(01)01121-5 PG 5 WC Physics, Particles & Fields SC Physics GA 421CR UT WOS:000168045000023 ER PT J AU White, AR AF White, AR TI The anomaly and reggeon field theory in QCD SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT QCD 2000 Euroconference CY JUL 06-13, 2000 CL MONTPELLIER, FRANCE SP QCD ID POMERON; SCATTERING; AMPLITUDES; UNITARITY AB The appearance of the U(1) anomaly in the interactions of reggeized gluons is described. Also discussed is the crucial role the anomaly can play in providing the non-perturbative properties necessary for a transition from gluon and quark reggeon diagrams to hadron reggeons and a reggeon field theory description of the pomeron. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP White, AR (reprint author), Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. NR 20 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 96 BP 277 EP 286 DI 10.1016/S0920-5632(01)01142-2 PG 10 WC Physics, Particles & Fields SC Physics GA 421CR UT WOS:000168045000044 ER PT J AU Hsiung, YB AF Hsiung, YB TI epsilon '/epsilon and rare K-L decays from KTeV experiment SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT QCD 2000 Euroconference CY JUL 06-13, 2000 CL MONTPELLIER, FRANCE SP QCD ID DIRECT CP VIOLATION; NEUTRAL-KAON SYSTEM; FORM-FACTOR; BRANCHING RATIO; KL->E+E-GAMMA; INFORMATION; SEARCH AB We update the current status for the measurement of the direct-CP violation parameters epsilon '/epsilon in the KTeV experiment at Fermilab. Substaintial statistics have been accumulated during the 1996-7 run and 1999 run for both epsilon '/epsilon and rare K-L decay searches. The first KTeV result on epsilon '/epsilon published last year was Re(epsilon '/epsilon) (28.0 +/- 4.1) x 10(-4) based on the 23% data from 1996-7 run. Combining with the previous E731, NA31 and the recent preliminary NA48 results, the grand average is Re(epsilon '/epsilon) = (19.3 +/- 3.6) x 10(-4) (with S = 1.49), more than 5 sigma above zero. More data from both KTeV and NA48 after completing the analysis will further improve the precision of this measurement in the near future and hopefully further improve the agreement. New results on the braching ratio and form factor measurements of K-L --> mu (+)mu (-)gamma using 1997 data are also presented. We find that BR(K-L --> mu (+)mu (-)gamma) = (3.66 +/- 004(stat) +/- 0.07(syst)) x 10(-7). The form factor parameter alpha (kappa)* is measured to be alpha (K)* = -0.157(-0.027)(+0.025) . We make the first measurement of the parameter a from the D'Ambrosio, Isidori, and Portoles form factor, finding alpha = -1.53 +/- 0.09. This measurement of alpha limits the CKM parameter rho > -0.2. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Hsiung, YB (reprint author), Fermi Natl Accelerator Lab, MS122,POB 500, Batavia, IL 60510 USA. NR 40 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 96 BP 301 EP 309 DI 10.1016/S0920-5632(01)01145-8 PG 9 WC Physics, Particles & Fields SC Physics GA 421CR UT WOS:000168045000047 ER PT J AU Cebrian, S Morales, A Aalseth, CE Avignone, FT Brodzinski, RL Garcia, E Gonzalez, D Hensley, WK Irastorza, IG Kirpichnikov, IV Klimenko, AA Miley, HS Morales, J de Solorzano, AO Osetrov, SB Pogosov, VS Puimedon, J Reeves, JH Sarsa, ML Scopel, S Smolnikov, AA Tamanyan, AG Vasenko, AA Vasiliev, SI Villar, JA AF Cebrian, S Morales, A Aalseth, CE Avignone, FT Brodzinski, RL Garcia, E Gonzalez, D Hensley, WK Irastorza, IG Kirpichnikov, IV Klimenko, AA Miley, HS Morales, J de Solorzano, AO Osetrov, SB Pogosov, VS Puimedon, J Reeves, JH Sarsa, ML Scopel, S Smolnikov, AA Tamanyan, AG Vasenko, AA Vasiliev, SI Villar, JA TI First results of the IGEX dark matter experiment at the Canfranc Underground Laboratory SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 6th International Conference on Frontiers in Particle Astrophysics and Cosmology CY SEP 30-OCT 05, 2000 CL SAN FELIU DE GUIXOLS, SPAIN ID DOUBLE-BETA DECAY; SEARCH; GE-76 AB The enriched Ge-76 double-beta decay detectors from the International Germanium EXperiment (IGEX), operating in the Canfranc Underground Laboratory with an overbuden of 2450 m.w.e., were recently upgraded to use them also in a search for WIMPs. This paper presents a description of the experiment and the data analysis as well as a new exclusion plot, sigma (m), derived from the IGEX data for WIMP-nucleon spin-independent interaction. To obtain this result, 30 days of data from one 2-kg IGEX detector, with an energy threshold E-thr similar to 4 keV, have been considered. These results improve the exclusion limits derived from other conventional ionization germanium experiments in the similar to 50 GeV DAMA region. C1 Univ Zaragoza, Lab Nucl & High Phys, E-50009 Zaragoza, Spain. Univ S Carolina, Columbia, SC 29208 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. Inst Theoret & Expt Phys, Moscow 117259, Russia. Baksan Neutrino Observ, Inst Nucl Res, Neutrino 361609, Russia. Yerevan Phys Inst, Yerevan 375036, Armenia. RP Cebrian, S (reprint author), Univ Zaragoza, Lab Nucl & High Phys, E-50009 Zaragoza, Spain. RI Irastorza, Igor/B-2085-2012; Sarsa Sarsa, Maria Luisa/K-6108-2014; Villar, Jose Angel/K-6630-2014 OI Garcia Abancens, Eduardo/0000-0002-9827-2332; Irastorza, Igor/0000-0003-1163-1687; Sarsa Sarsa, Maria Luisa/0000-0002-7552-1228; Villar, Jose Angel/0000-0003-0228-7589 NR 13 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD APR PY 2001 VL 95 BP 229 EP 232 DI 10.1016/S0920-5632(01)01086-6 PG 4 WC Physics, Particles & Fields SC Physics GA 416ZX UT WOS:000167811600043 ER PT J AU Zeeb, CN Dolaghan, JS Burns, PJ AF Zeeb, CN Dolaghan, JS Burns, PJ TI An efficient Monte Carlo particle tracing algorithm for large, arbitrary geometries SO NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS LA English DT Article ID RAY AB An efficient algorithm for tracing particles in large, arbitrary geometries containing nonparticipating media is presented. For arbitrary triangles and/or convex planar quadrilaterals, an efficient intersection algorithm is discussed in detail. Several techniques used in ray tracing to limit the number of surfaces tested are discussed and the method of Uniform Spatial Division (USD) is implemented. The "mailbox" technique is also discussed. The efficiency of the intersection algorithm and USD are demonstrated by timing results. For USD, speedups exceeding a factor of eighty are observed. C1 Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80523 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Burns, PJ (reprint author), Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80523 USA. NR 31 TC 9 Z9 9 U1 0 U2 0 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 USA SN 1040-7790 J9 NUMER HEAT TR B-FUND JI Numer Heat Tranf. B-Fundam. PD APR PY 2001 VL 39 IS 4 BP 325 EP 344 PG 20 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA 427FQ UT WOS:000168394500001 ER PT J AU Afanasyev-Charkin, IV Cooke, DW Ishimaru, M Bennett, BL Gritsyna, VT Williams, JR Sickafus, KE AF Afanasyev-Charkin, IV Cooke, DW Ishimaru, M Bennett, BL Gritsyna, VT Williams, JR Sickafus, KE TI Refractive indices of metastable and amorphous phases in Ne+-ion irradiated magnesium-aluminate spinel SO OPTICAL MATERIALS LA English DT Article DE spinel; index of refraction; ion implantation; TEM; optical transmission ID MGAL2O4 SPINEL AB Single-crystal MgAl2O4 was subjected to 180 keV Ne+-ion irradiation to fluences of(1, 5, and 10) x 10(20) ions/m(2) The metastable and amorphous phases induced by irradiation were studied using transmission electron microscopy (TEM) and optical transmission spectroscopy. The thicknesses of implantation-induced layer structures were obtained from TEM observations. This information was then used in conjunction with optical transmission results to deduce the refractive indices of individual structures. It was found that the lowest ion fluence produces a metastable layer with a reduced index of refraction (n = 1.70 +/- 0.005) relative to the pristine substrate (n = 1.72), whereas the intermediate fluence induces an amorphous region (n = 1.61 +/- 0.01) bounded by metastable regions. The effect of the highest fluence is to increase the thickness of the amorphous layer (n = 1.60 +/- 0.01) at the expense of the metastable regions. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Kharkov Natl Univ, Dept Phys & Technol, UA-61077 Kharkov, Ukraine. Osaka Univ, ISIR, Ibaraki, Osaka 5670047, Japan. Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA. RP Sickafus, KE (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS-G755, Los Alamos, NM 87545 USA. RI Williams, Jesse/B-5923-2008 NR 10 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD APR PY 2001 VL 16 IS 3 BP 397 EP 402 DI 10.1016/S0925-3467(00)00048-3 PG 6 WC Materials Science, Multidisciplinary; Optics SC Materials Science; Optics GA 421HG UT WOS:000168058500009 ER PT J AU Sae-Lao, B Montcalm, C AF Sae-Lao, B Montcalm, C TI Molybdenum-strontium multilayer mirrors for the 8-12-nm extreme-ultraviolet wavelength region SO OPTICS LETTERS LA English DT Article AB Mo-Sr multilayer mirrors were successfully deposited by dc-magnetron sputtering and characterized in situ with synchrotron radiation. Normal-incidence (3.6 degrees) reflectance of 23.0% at 8.8 nm, 40.8% at 9.4 nm, and 48.3% at 10.5 nm were measured before the samples were exposed to air. After exposure, as a result of the reactivity of Sr with oxygen and water vapor, the reflectance of these multilayers decreased rapidly. Attempts to use thin layers of C to passivate the surface of these Mo-Sr multilayers were unsuccessful. (C) 2001 Optical Society of America. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Sae-Lao, B (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-395, Livermore, CA 94551 USA. NR 6 TC 16 Z9 16 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 1 PY 2001 VL 26 IS 7 BP 468 EP 470 DI 10.1364/OL.26.000468 PG 3 WC Optics SC Optics GA 416HL UT WOS:000167774200024 PM 18040356 ER PT J AU Wright, IG Pint, BA Tortorelli, PF AF Wright, IG Pint, BA Tortorelli, PF TI High-temperature oxidation behavior of ODS-Fe(3)Al SO OXIDATION OF METALS LA English DT Article DE high-temperature oxidation; ODS-Fe(3)Al; scale spallation ID IRON ALUMINIDES; ALLOYS; OXIDE; PERFORMANCE; NICKEL; SCALES; MORPHOLOGY; DIFFUSION AB The high-temperature oxidation behavior of an oxide dispersion-strengthened (ODS) Fe(3)Al alloy has been studied during isothermal and cyclic exposures in oxygen and air over the temperature range 1000 to 1300 degreesC. Compared to commercially available ODS-FeCrAl alloys, it exhibited very similar shortterm rates of oxidation at 1000 and 1100 degreesC, but at higher temperatures the oxidation rate increased because of increased scale spallation. Over the entire temperature range, the oxide scale formed was alpha -Al(2)O(3), with the morphological features typical of reactive-element doping and was similar to those formed on the ODS-FeCrAl alloys. Although initially this scale appeared to be extremely adherent to the Fe(3)Al substrate, an undulating metal-oxide interface formed with increasing lime and temperature, which led to cracking of the scale in the vicinity of surface undulations accompanied bl, a loss of small fragments of the full-scale thickness. In some instances, the surface undulations appeared to have resulted from guess outward local extrusion of the alloy substrate. Similar features developed on the FeCrAl alloys, hut they were typically much smaller after a given oxidation exposure. The ODS-Fe(3)Al alloy has a significantly larger coefficient of thermal expansion (CTE) than typical FeCrAl alloys (approximately 1.5 times at 900 degreesC) and this appears to be the major reason for the greater tendency,for scale spallation. The stress generated by the CTE mismatch,vas apparently sufficient to lead to buckling and limited loss of scale at temperatures up to 1100 degreesC, with an increasing amount of substrate deformation at 1200 degreesC and above. This deformation led to increased scale spallation by producing an out-of-plane stress distribution, resulting in cracking or shearing of the oxide. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Wright, IG (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Wright, Ian/A-8300-2008; Pint, Bruce/A-8435-2008; Tortorelli, Peter/E-2433-2011 OI Pint, Bruce/0000-0002-9165-3335; NR 43 TC 50 Z9 51 U1 0 U2 10 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0030-770X J9 OXID MET JI Oxid. Met. PD APR PY 2001 VL 55 IS 3-4 BP 333 EP 357 DI 10.1023/A:1010316428752 PG 25 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 426PQ UT WOS:000168357900010 ER PT J AU Baskes, MI Asta, M Srinivasan, SG AF Baskes, MI Asta, M Srinivasan, SG TI Determining the range of forces in empirical many-body potentials using first-principles calculations SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID METALS; ALUMINUM; PSEUDOPOTENTIALS; HYDROGEN; DEFECTS AB A computationally efficient and accurate description of interatomic interactions is indispensable to the fidelity of atomistic simulations. In the development of popular empirical potentials, it is assumed that atoms separated beyond a certain cut-off distance have negligible interatomic forces and hence may be safely ignored in the force calculations. This arbitrary, and yet common, practice of force truncation is undoubtedly nd hoc and is not grounded in the physics of the interactions. With the advent of fast computers and accurate first-principles calculations, it is now feasible to determine what this cut-off distance should be. In this work. employing a first-principles calculation based on density functional theory and the local density approximation (LDA) we probe the extent of interatomic forces in aluminium caused by a variety of defect types. The forces on neighbours to these defects, obtained from first-principles calculations, were then compared with the corresponding values from many short- and long-range semiempirical literature potentials. It is clear that none of these semiempirical potentials can reproduce the LDA results, although the newest potentials that use LDA force data for potential determination come close. The results also indicate that nearest-neighbour forces are dominant for zero- and one-dimensional defects. Only for a free surface did we find forces at more distant neighbours to be comparable in magnitude. Using the new LDA force data for the single vacancy, we modify a literature potential to improve significantly the agreement with the first-principles calculations. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. RP Baskes, MI (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 27 TC 20 Z9 20 U1 0 U2 7 PU TAYLOR & FRANCIS LTD PI LONDON PA 11 NEW FETTER LANE, LONDON EC4P 4EE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD APR PY 2001 VL 81 IS 4 BP 991 EP 1008 PG 18 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 420HC UT WOS:000167998700012 ER PT J AU Roy, M Mitchell, JF Ramirez, AP Schiffer, P AF Roy, M Mitchell, JF Ramirez, AP Schiffer, P TI Low-temperature magnetothermodynamics of Pr0.7Ca0.3MnO3 SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID INSULATOR-METAL TRANSITION; DEPENDENT SPECIFIC-HEAT; MAGNETIC-FIELD; COLOSSAL MAGNETORESISTANCE; GIANT MAGNETORESISTANCE; NEUTRON-DIFFRACTION; SPIN-WAVES; PR1-XCAXMNO3; MANGANITES; PHASE AB We present a detailed magnetothermal study of Pr0.7Ca0.3MnO3, a perovskite manganite in which an insulator-metal transition can be driven by magnetic field but also by pressure, visible light, X-rays or high currents. We find that the field-induced transition is associated with a large release of energy which accounts for its strong irreversibility. In the ferromagnetic metallic state, specific heat and magnetization measurements indicate a much smaller spin-wave stiffness than seen in any other ferromagnetic manganite, which we explain in terms of ferromagnetism among the Pr moments. The Pr ferromagnetism also appears to influence the low-temperature thermodynamic phase diagram of this material and the uniquely sensitive metastability of the insulating state. C1 Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. Penn State Univ, Dept Phys, Davey Lab 104, University Pk, PA 16802 USA. RP Schiffer, P (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RI Schiffer, Peter/F-3227-2011; OI Schiffer, Peter/0000-0002-6430-6549 NR 39 TC 9 Z9 9 U1 0 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA 11 NEW FETTER LANE, LONDON EC4P 4EE, ENGLAND SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD APR PY 2001 VL 81 IS 4 BP 417 EP 431 DI 10.1080/13642810108226412 PG 15 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA 420GZ UT WOS:000167998400005 ER PT J AU Qiao, ZJ Strampp, W AF Qiao, ZJ Strampp, W TI L-A-B representation for nonlinear evolution equations and its applications SO PHYSICA A LA English DT Article DE L-A-B representation; Lie quotient algebra; category; Kaup-Newell ID HIERARCHIES AB In this paper we consider the L-A-B representation of nonlinear evolution equations (NLEEs) and present an approach to determine its range. The method we adopt is that of Lie quotient algebras. As an example, we consider the Kaup-Newell spectral problem and give a category of NLEEs associated with it. Particularly, we obtain the negative order hierarchies of NLEEs by considering the inverse of recursion operator. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Gesamthsch Kassel, Fachbereich Math Informat 17, D-34109 Kassel, Germany. Fudan Univ, Inst Math, Shanghai 200433, Peoples R China. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Qiao, ZJ (reprint author), Univ Gesamthsch Kassel, Fachbereich Math Informat 17, Heinrich Plett Str 40, D-34109 Kassel, Germany. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD APR 1 PY 2001 VL 293 IS 1-2 BP 143 EP 156 DI 10.1016/S0378-4371(00)00593-8 PG 14 WC Physics, Multidisciplinary SC Physics GA 413TP UT WOS:000167628300013 ER PT J AU Crooker, SA Rickel, DG Johnston-Halperin, E Awschalom, DD Knobel, R Samarth, N Lyo, SK Efros, A AF Crooker, SA Rickel, DG Johnston-Halperin, E Awschalom, DD Knobel, R Samarth, N Lyo, SK Efros, A TI Optical spectroscopy of magnetic 2D electron gases at the Los Alamos pulsed magnetic field facility SO PHYSICA B LA English DT Article; Proceedings Paper CT 14th International Conference on High Magntic Fields in Semiconductor Physicis (SemiMag 2000) CY SEP 24-29, 2000 CL KUNIBIKI-MESSE, JAPAN DE pulsed magnetic fields; charged excitons; quantum dots; magnetic semiconductors ID SEMICONDUCTOR QUANTUM-WELLS; STATE; EXCITON AB A brief overview of the magnet technologies at the pulsed field facility at Los Alamos is presented, focusing on the experimental capabilities made possible by the unique generator-driven 60 T long-pulse magnet. Optical spectroscopy is one such beneficiary, and recent measurements of semiconductor systems are discussed, including studies of magnetic-disorder annealing in diluted magnetic semiconductors, "dark" excitons in CdSe quantum dots, and in particular, studies of negatively-charged exciton states in magnetic 2D electron gases. Here, the huge Zeeman energy inherent in these magnetically-doped II-VI materials results in a completely spin-polarized electron gas (even at low magnetic fields), and drives an apparent instability of the singlet (spin antiparallel) electrons that are bound to the photohole. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. USN, Res Lab, Nanostruct Opt Sect, Washington, DC 20375 USA. RP Crooker, SA (reprint author), Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA. RI Johnston-Halperin, Ezekiel/B-5902-2012; Samarth, Nitin/C-4475-2014 OI Samarth, Nitin/0000-0003-2599-346X NR 14 TC 2 Z9 2 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 2001 VL 298 IS 1-4 BP 369 EP 375 DI 10.1016/S0921-4526(01)00345-3 PG 7 WC Physics, Condensed Matter SC Physics GA 437LH UT WOS:000168992800076 ER PT J AU Yokoi, H Tozer, SW Kim, Y Kakudate, Y Wojtowicz, T Karczewski, G Kossut, J AF Yokoi, H Tozer, SW Kim, Y Kakudate, Y Wojtowicz, T Karczewski, G Kossut, J TI Magnetic field induced recovery of exciton photoluminescence extinguished by pressure in a CdTe/CdMnTe single quantum well SO PHYSICA B LA English DT Article; Proceedings Paper CT 14th International Conference on High Magntic Fields in Semiconductor Physicis (SemiMag 2000) CY SEP 24-29, 2000 CL KUNIBIKI-MESSE, JAPAN DE excitonic energy transfer; magnetoluminescence; CdTe/CdMnTe single quantum well; pressure AB We studied pressure and magnetic field effects on the exciton states in a 1.0 nm thick CdTe/Cd1-xMnxTe (x = 0.4) single quantum well at T = 4K to B = 60T and P = 1.9 GPa, using a motor generator driven long pulsed magnet and a diamond anvil cell with a plastic body. Complete extinction of the exciton emission was observed with increasing a pressure to 1,6 GPa. The emission was found to recover at about 2.17eV by the application of a magnetic field of 7T and became stronger with increasing the field. When the pressure was increased to 1.9 GPa, the recovery occurred at about 2.15 GPa by a field of 40T, Analysis of pressure and magnetic field dependence of the emission peak profiles suggests that the novel phenomena are related to excitonic energy transfer from the quantum well to Mn2+ 3d electrons in the barrier. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan. Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland. RP Yokoi, H (reprint author), Natl Inst Mat & Chem Res, 1-1 Higashi, Tsukuba, Ibaraki 3058565, Japan. RI Kossut, Jacek/K-9481-2016; Wojtowicz, Tomasz/A-2887-2017 OI Kossut, Jacek/0000-0001-6165-3169; NR 6 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 2001 VL 298 IS 1-4 BP 426 EP 430 DI 10.1016/S0921-4526(01)00355-6 PG 5 WC Physics, Condensed Matter SC Physics GA 437LH UT WOS:000168992800086 ER PT J AU Qualls, JS Balicas, L Brooks, JS Harrison, N Montgomery, LK Tokumoto, M AF Qualls, JS Balicas, L Brooks, JS Harrison, N Montgomery, LK Tokumoto, M TI Charge density wave system in high magnetic fields: competition between Pauli and orbital effects SO PHYSICA B LA English DT Article; Proceedings Paper CT 14th International Conference on High Magntic Fields in Semiconductor Physicis (SemiMag 2000) CY SEP 24-29, 2000 CL KUNIBIKI-MESSE, JAPAN DE charge transfer salts; alpha-(ET)(2)MHg(SCN)(4); charge density wave; field-induced sub-phases ID LOW-TEMPERATURE PHASE; BEDT-TTF; ALPHA-(BEDT-TTF)(2)MHG(SCN)(4); ALPHA-(BEDT-TTF)(2)KHG(SCN)(4); C-13-NMR; CRYSTAL; STATE; NH4 AB A detailed angular dependent magneto-transport and magnetization study of the charge transfer salt alpha-(ET)(2)MHg(SCN)(4), where M = K, Rb, or Tl, reveals multiple electronic sub-phases with respect to temperature, field strength, and field orientation. We find that the low temperature ground state undergoes two subsequent field-induced phase transitions above a critical angle, theta (c), of the magnetic field with respect to the crystallographic axes (theta (c) greater than or equal to 50 degrees). This new T-B-theta phase diagram may be qualitatively described assuming a charge density wave framework with the field-induced transitions arising from the interplay between orbital and Pauli effects. This implies well (but not perfectly) nested quasi-one-dimensional Fermi sheets. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA. Electrotech Lab, Tsukuba, Ibaraki 305, Japan. Indiana Univ, Dept Chem, Bloomington, IN 47405 USA. LANL, NHMFL, Los Alamos, NM 87545 USA. NHMFL, Tallahassee, FL 32306 USA. RP Qualls, JS (reprint author), Wake Forest Univ, Dept Phys, POB 7507, Winston Salem, NC 27109 USA. RI Messier, Claude/A-2322-2008 OI Messier, Claude/0000-0002-4791-1763 NR 25 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 2001 VL 298 IS 1-4 BP 551 EP 556 DI 10.1016/S0921-4526(01)00381-7 PG 6 WC Physics, Condensed Matter SC Physics GA 437LH UT WOS:000168992800112 ER PT J AU Schlueter, JA Kini, AM Ward, BH Geiser, U Wang, HH Mohtasham, J Winter, RW Gard, GL AF Schlueter, JA Kini, AM Ward, BH Geiser, U Wang, HH Mohtasham, J Winter, RW Gard, GL TI Universal inverse deuterium isotope effect on the T-c of BEDT-TTF-based molecular superconductors SO PHYSICA C LA English DT Article DE organic superconductors; superconducting transitions T-c; bis(ethylenedithio)tetrathiafulvalene; pentafluoroalkylsulfonate anion; isotope effect ID PRESSURE ORGANIC SUPERCONDUCTOR; AMBIENT-PRESSURE; KAPPA-(ET)2X SUPERCONDUCTORS; PAIRING MECHANISM; INSULATOR TRANSITION; PALLADIUM-HYDROGEN; CRITICAL FIELDS; BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE; DONOR; KAPPA-(BEDT-TTF)(2)CU(NCS)(2) AB Deuterium substitution of the ethylene end groups of the ET [ET: BEDT-TTF or bis(ethylenedithio)tetrathiafulvalene] electron-donor molecule results in a 0.25 K increase in the superconducting transition temperature of three molecular superconductors derived from this molecule. Simplistically speaking, this change in T-c is in contradiction to that predicted by the electron-phonon coupling mechanism of the BCS theory. We suggest that the slight shortening of the C-D bond relative to the C-H bond, coupled with the recent findings of a large, negative uniaxial pressure derivative of T-c in kappa-(ET)(2)Cu(SCN)(2) and beta "-(ET)(2)SF5CH2CF2SO3, can explain this unique effect. Herein we report the first study of the effect of deuterium substitution on the superconducting transition temperature in a molecular-based superconductor in which the electron-donor molecules are packed in a beta " motif, viz., beta "-(ET)(2)SF5CH2CF2SO3. This compound is ideally suited for this study because it contains disrrpre (non-polymeric) anions, has a completely ordered structure, is indefinitely stable in air at room temperature, and is free from possible magnetic impurities. Substitution of the eight hydrogen atoms of the ET molecule by deuterium causes the T-c of beta "-(ET)(2)SF5CH2CF2SO3 to increase from 4.34 +/- 0.05 to 4.61 +/- 0.03 K. These values were determined by measuring several representative crystals from various parallel electrocrystallization experiments containing h(8)- or d(8)-ET that was prepared in parallel syntheses, This is the first example which demonstrates that the inverse (positive) isotope effect previously observed in kappa -phase salts is also present in a beta " -phase superconductor. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Portland State Univ, Dept Chem, Portland, OR 97207 USA. RP Schlueter, JA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave,Bldg 200, Argonne, IL 60439 USA. RI Kini, Aravinda/F-4467-2012 NR 67 TC 22 Z9 22 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 APR 1 PY 2001 VL 351 IS 3 BP 261 EP 273 DI 10.1016/S0921-4534(00)01620-8 PG 13 WC Physics, Applied SC Physics GA 418NA UT WOS:000167897200007 ER PT J AU Fringer, OB Holm, DD AF Fringer, OB Holm, DD TI Integrable vs. nonintegrable geodesic soliton behavior SO PHYSICA D LA English DT Article DE geodesic motion; solitons; Hamiltonian system; pulsons ID SHALLOW-WATER EQUATION; HAMILTONIAN SYSTEM; GEOMETRY; PDES AB We study confined solutions of certain evolutionary partial differential equations (PDE) in 1 + 1 space-time. The PDE we study are Lie-Poisson Hamiltonian systems for quadratic Hamiltonians defined on the dual of the Lie algebra of vector fields on the real line. These systems are also Euler-Poincare equations for geodesic motion on the diffeomorphism group in the sense of the Arnold program for ideal fluids, but where the kinetic energy metric is different from the L-2 norm of the velocity. These PDE possess a finite-dimensional invariant manifold of particle-like (measure-valued) solutions we call "pulsons". We solve the particle dynamics of the two-pulson interaction analytically as a canonical Hamiltonian system for geodesic motion with two degrees of freedom and a conserved momentum. The result of this two-pulson interaction for rear-end collisions is elastic scattering with a phase shift, as occurs with solitons. The results for head-on antisymmetric collisions of pulsons tend to be singularity formation. Numerical simulations of these PDE show that their evolution by geodesic dynamics for confined (or compact) initial conditions in various nonintegrable cases possesses the same type of multi-soliton behavior (elastic collisions, asymptotic sorting by pulse height) as the corresponding integrable cases do. We conjecture this behavior occurs because the integrable two-pulson interactions dominate the dynamics on the invariant pulson manifold, and this dynamics dominates the PDE initial value problem for most choices of confined pulses and initial conditions of finite extent. (C) 2001 Published by Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Div Theoret Phys, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA. RP Holm, DD (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret Phys, Los Alamos, NM 87545 USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 24 TC 23 Z9 23 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD APR 1 PY 2001 VL 150 IS 3-4 BP 237 EP 263 DI 10.1016/S0167-2789(00)00215-3 PG 27 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA 415ZG UT WOS:000167753000006 ER PT J AU Quinn, JJ Wojs, A Quinn, JJ Benjamin, AT AF Quinn, JJ Wojs, A Quinn, JJ Benjamin, AT TI The Fermion-Boson transformation in fractional quantum Hall systems SO PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES LA English DT Article DE Boson-Fermion mapping; low-dimensional structure; fractional quantum Hall effect ID COMPOSITE FERMIONS; CONSTRUCTIVE PROOF; HIERARCHY; EXCITATIONS; UNIMODALITY; STATES; FLUID AB A Fermion-to-Boson transformation is accomplished by attaching to each Fermion a single flux quantum oriented opposite to the applied magnetic field, When the mean field approximation is made in the Haldane spherical geometry, the Fermion angular momentum l(P) is replaced by l(B) = l(F) - 1/2(N - 1). The set of allowed total angular momentum multiplets is identical in the two different pictures. The Fermion and Boson energy spectra in the presence of many-body interactions are identical if and only if the pseudopotential is "harmonic" in form. However, similar low-energy bands of states with Laughlin correlations occur in the two spectra if the interaction has short range. The transformation is used to clarify the relation between Boson and Fermion descriptions of the hierarchy of condensed fractional quantum Hall states. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, South Coll 200, Dept Phys, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Wroclaw Univ Technol, PL-50370 Wroclaw, Poland. Occidental Coll, Los Angeles, CA 90041 USA. Harvey Mudd Coll, Claremont, CA 91711 USA. RP Quinn, JJ (reprint author), Univ Tennessee, South Coll 200, Dept Phys, Knoxville, TN 37996 USA. EM jjquinn@utkux.utk.edu RI Wojs, Arkadiusz/M-9381-2015 OI Wojs, Arkadiusz/0000-0002-3624-5275 NR 13 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1386-9477 J9 PHYSICA E JI Physica E PD APR PY 2001 VL 9 IS 4 BP 701 EP 708 PG 8 WC Nanoscience & Nanotechnology; Physics, Condensed Matter SC Science & Technology - Other Topics; Physics GA 408WN UT WOS:000167337200012 ER PT J AU Zunger, A AF Zunger, A TI Pseudopotential theory of semiconductor quantum dots SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article; Proceedings Paper CT International Conference on Semiconductor Quantum Dots (QD2000) CY JUL 31-AUG 03, 2000 CL TECHN UNIV MUNICH, MUNICH, GERMANY HO TECHN UNIV MUNICH ID ELECTRONIC-STRUCTURE CALCULATIONS; P METHOD; EXCITONIC TRANSITIONS; SI NANOCRYSTALS; INP; NANOSTRUCTURES; SUPERLATTICES; CONFINEMENT; ENERGIES; SYSTEMS AB This paper reviews our pseudopotential approach to study the electronic structure of semiconductor quantum dots, emphasizing methodology ideas and a survey of recent applications to both "free-standing" and "semiconductor embedded" quantum-dot systems. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Zunger, A (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 49 TC 68 Z9 68 U1 1 U2 5 PU WILEY-V C H VERLAG GMBH PI BERLIN PA PO BOX 10 11 61, D-69451 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD APR PY 2001 VL 224 IS 3 BP 727 EP 734 DI 10.1002/(SICI)1521-3951(200104)224:3<727::AID-PSSB727>3.3.CO;2-0 PG 8 WC Physics, Condensed Matter SC Physics GA 427XU UT WOS:000168432100024 ER PT J AU Nair, SV Masumoto, Y AF Nair, SV Masumoto, Y TI Multi-exciton states and many-body correlations in quantum dots SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article; Proceedings Paper CT International Conference on Semiconductor Quantum Dots (QD2000) CY JUL 31-AUG 03, 2000 CL TECHN UNIV MUNICH, MUNICH, GERMANY HO TECHN UNIV MUNICH AB We theoretically study the optical emission spectra of multi-exciton states using a configuration interaction approach for a few excitons and a density functional calculation for several excitons in a single quantum dot. Considering InP quantum dots as an example, we show that the biexciton binding energy is determined by a delicate balance of contributions from several configurations. We discuss how Coulomb correlations and the spin fine-structure of multi-excitonic states clearly manifest in the emission spectrum of highly excited quantum dots. We also predict a new kind of configuration crossing transitions that lead to weak emission lines several tens of meV below the exciton ground state. C1 JST, ERATO, Single Quantum Dot Project, Tsukuba, Ibaraki 3002635, Japan. Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan. RP Nair, SV (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. OI Nair, Selvakumar/0000-0002-6140-9710 NR 10 TC 6 Z9 6 U1 0 U2 2 PU WILEY-V C H VERLAG GMBH PI BERLIN PA PO BOX 10 11 61, D-69451 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD APR PY 2001 VL 224 IS 3 BP 739 EP 744 DI 10.1002/(SICI)1521-3951(200104)224:3<739::AID-PSSB739>3.3.CO;2-P PG 6 WC Physics, Condensed Matter SC Physics GA 427XU UT WOS:000168432100026 ER PT J AU Chakraborty, HS Hansen, DL Hemmers, O Deshmukh, PC Focke, P Sellin, IA Heske, C Lindle, DW Manson, ST AF Chakraborty, HS Hansen, DL Hemmers, O Deshmukh, PC Focke, P Sellin, IA Heske, C Lindle, DW Manson, ST TI Interchannel coupling in the photoionization of the M shell of Kr well above threshold: Experiment and theory SO PHYSICAL REVIEW A LA English DT Article ID INDEPENDENT-PARTICLE APPROXIMATION; RANDOM-PHASE APPROXIMATION; ENERGY AB Photoionization cross sections and asymmetry (beta) parameters for Kr 3s, 3p, and 3d subshells have been measured and calculated in the 300-1300-eV photon energy range. Good agreement between experiment and theory is found for both cross-section branching ratios and beta parameters. Interchannel coupling among the channels arising from 3s, 3p, and 3d subshells is found to be necessary for quantitative accuracy of the theory. This shows that the interchannel coupling phenomenology far above threshold, found previously for outer shells of Ne and Ar, is also operative for inner atomic shells. C1 Indian Inst Technol, Dept Phys, Madras 600036, Chennai, India. Univ Nevada, Dept Chem, Las Vegas, NV 89154 USA. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA. RP Chakraborty, HS (reprint author), Max Planck Inst Phys Komplexer Syst, Nothnitzer Str 38, D-01187 Dresden, Germany. NR 18 TC 18 Z9 18 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 APR PY 2001 VL 63 IS 4 AR 042708 DI 10.1103/PhysRevA.63.042708 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300061 ER PT J AU Deng, L Payne, MG Garrett, WR AF Deng, L Payne, MG Garrett, WR TI Four-wave mixing with short pulses and optimized atomic coherence SO PHYSICAL REVIEW A LA English DT Article ID ELECTROMAGNETICALLY INDUCED TRANSPARENCY; NONLINEAR FREQUENCY-CONVERSION; AMPLIFICATION; REFRACTION; GENERATION; INVERSION; SYSTEMS; QUANTUM; INDEX AB We present a lime-dependent calculation for four-wave mixing using a combination of long, short, and time delayed laser pulses in the context of electromagnetically induced transparency. Two transform limited nanosecond lasers are used to create a highly coherent mixture of the ground state and an excited state via a two-photon process. Once the induced transparency is established, a laser with short pulse length is injected after a suitable delay to generate four-wave mixing. We show that the wave mixing process is phase matched for all detunings, and with appropriately selected atomic coherence and populations, near 100% photon flux conversion efficiency can be obtained, independent of the intensity of the short pulse laser. In addition, we show that for small detunings for the short pulse laser, the four-wave mixing field travels with the speed of light in vacuum and suffers no pulse distortion even though the medium is highly dispersive at the frequency of the generated wave. These advantages open a door for future applications of the scheme for highly efficient, very stable UV generation. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. Georgia So Univ, Dept Phys, Statesboro, GA 30460 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Chem Phys Sect, Oak Ridge, TN 37831 USA. RP Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. NR 21 TC 5 Z9 6 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD APR PY 2001 VL 63 IS 4 AR 043811 DI 10.1103/PhysRevA.63.043811 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300117 ER PT J AU Guo, CL Gibson, GN AF Guo, CL Gibson, GN TI Ellipticity effects on single and double ionization of diatomic molecules in strong laser fields SO PHYSICAL REVIEW A LA English DT Article ID NONSEQUENTIAL DOUBLE-IONIZATION; MULTIPHOTON IONIZATION; DISSOCIATION; HELIUM; PULSE AB By studying high-precision ion yield measurements in diatomic molecules N-2 and NO with 30-fs linearly (LP) and circularly (CP) polarized light, we extend to molecular systems the study of ellipticity effects on both single and double ionization in strong laser fields. Competing ionization rates between LP and CP light, as predicted in the Ammosov-Delone-Krainov model, is observed experimentally by studying singly ionized N-2 and NO. We further observe an anomalously high NO2+ signal with CP, which shows a nonsequential ionization signature. A hypothesis is given that ties this observation to the influences of electronic structure on ellipticity effects in strong-field ionization. C1 Univ Connecticut, Dept Phys, Storrs, CT 06269 USA. RP Guo, CL (reprint author), Univ Calif Los Alamos Natl Lab, Condensed Matter & Thermal Phys Grp, POB 1663, Los Alamos, NM 87545 USA. NR 20 TC 63 Z9 64 U1 3 U2 10 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 APR PY 2001 VL 63 IS 4 AR 040701 DI 10.1103/PhysRevA.63.040701 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300009 ER PT J AU Mizel, A Mitchell, MW Cohen, ML AF Mizel, A Mitchell, MW Cohen, ML TI Energy barrier to decoherence SO PHYSICAL REVIEW A LA English DT Article ID QUANTUM COMPUTATION; JOSEPHSON-JUNCTIONS; CELLULAR-AUTOMATA; LOGIC; COMPUTER; DOTS AB We propose a ground-state approach to realizing quantum computers. This scheme is time-independent and inherently defends against decoherence by possessing an energy barrier to excitation. We prove that our time-independent qubits can perform the same algorithms as their time-dependent counterparts. Advantages and disadvantages of the time-independent approach are described. A model involving quantum dots is provided for illustration. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Mizel, A (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Mitchell, Morgan/I-9027-2012 OI Mitchell, Morgan/0000-0001-8949-9407 NR 27 TC 15 Z9 15 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 APR PY 2001 VL 63 IS 4 AR 040302 DI 10.1103/PhysRevA.63.040302 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300003 ER PT J AU Moses, JD Holtkamp, DB King, JD Lisowski, PW Simmons, JE AF Moses, JD Holtkamp, DB King, JD Lisowski, PW Simmons, JE TI Angular distribution of neutral hydrogen following collisional electron detachment from H- at 2, 4, and 6 MeV SO PHYSICAL REVIEW A LA English DT Article ID CROSS-SECTIONS; NEGATIVE-IONS; H-0 AB The angular distribution of neutral hydrogen atoms following electron detachment from H- ion beams has been measured at 2, 4 and 6 MeV for targets of nitrogen and hydrogen gas. For this purpose, a vertically oriented. slit shaped H- beam was developed with lateral opening angle of about 3 mu rad. When account is taken of the angular acceptance of the slit detector system, good agreement is found with existing Born approximation theory for the scattering process [Wright, Franz and Genoni, Phys. Rev. A 32, 1215 (1985)]. The angular distributions are very sharply forward peaked. At 4 MeV, on a hydrogen target, the measurements are compatible with a relative differential cross section, of which the width at half maximum is about 7 mu rad; results were similar on nitrogen. Measurements were also made at the same energies on a nitrogen target for outgoing hydrogen atoms in the 2S first excited state. Coincidence with the induced decay of the Lyman-alpha photon defined the signal. For these cased the experimental width at half maximum was almost three times greater than that for the undifferentiated neutral state. An account will be given of the experiment, including mention of diagnostic charge fraction measurements on nitrogen, and the results will be compared with theory. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Moses, JD (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 31 TC 0 Z9 0 U1 0 U2 0 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 APR PY 2001 VL 63 IS 4 AR 042716 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300069 ER PT J AU Rochester, SM Hsiung, DS Budker, D Chiao, RY Kimball, DF Yashchuk, VV AF Rochester, SM Hsiung, DS Budker, D Chiao, RY Kimball, DF Yashchuk, VV TI Self-rotation of resonant elliptically polarized light in collision-free rubidium vapor SO PHYSICAL REVIEW A LA English DT Article ID NONLINEAR MAGNETOOPTICAL ROTATION; DOPPLER-BROADENED TRANSITIONS; AC-STARK SHIFTS; RADIATION POLARIZATION; FARADAY-ROTATION; OPTICAL-ACTIVITY; FIELD; SPECTROSCOPY; ATOMS; MEDIA AB Self-rotation (SR) of elliptically polarized light resonant with atoms in a collision-free vapor is investigated experimentally and theoretically. Results of density matrix calculations are compared to measurements of SR on the Rb D1 and D2 lines. It is noted that SR effects involving individual hyperfine transitions are suppressed due to Doppler broadening, and so previously unrecognized effects arising from the interaction of light with multiple hyperfine transitions can become dominant. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Rochester, SM (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM budker@socrates.Berkeley.edu RI Budker, Dmitry/F-7580-2016 OI Budker, Dmitry/0000-0002-7356-4814 NR 54 TC 62 Z9 63 U1 1 U2 5 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 APR PY 2001 VL 63 IS 4 AR 043814 DI 10.1103/PhysRevA.63.043814 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300120 ER PT J AU Unanyan, RG Shore, BW Bergmann, K AF Unanyan, RG Shore, BW Bergmann, K TI Preparation of an N-component maximal coherent superposition state using the stimulated Raman adiabatic passage method SO PHYSICAL REVIEW A LA English DT Article ID POPULATION TRANSFER; MOLECULES; CREATION AB We present a simple method for creating a maximal coherent superposition of N states (a superposition state with equal amplitudes) in a robust way. We show that in the adiabatic limit the robustness of the population transfer out of a single state to the superposition state is equivalent to stimulated Raman adiabatic passage. As is typical for schemes based upon population trapping the method is insensitive to radiative decay from excited states. C1 Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany. Armenian Natl Acad Sci, Inst Phys Res, Ashtarak 378410 2, Armenia. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Unanyan, RG (reprint author), Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany. RI BERGMANN, KLAAS/D-5543-2011 NR 17 TC 29 Z9 31 U1 0 U2 5 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 APR PY 2001 VL 63 IS 4 AR 043401 DI 10.1103/PhysRevA.63.043401 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300074 ER PT J AU Unanyan, RG Shore, BW Bergmann, K AF Unanyan, RG Shore, BW Bergmann, K TI Entangled-state preparation using adiabatic population transfer SO PHYSICAL REVIEW A LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; QUANTUM COMPUTATION; TRAPPED IONS; THERMAL MOTION; PHASE-FACTORS; ATOMS; CREATION; PASSAGE AB We describe an efficient and robust method for producing an entangled state of a two-spin system, using a sequence of two pulse pairs. We show that the mixing angle of the entangled state has a purely geometrical origin, so it is insensitive to small variations of the time-integrated pulse amplitude. C1 Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany. Armenian Natl Acad Sci, Inst Phys Res, Ashtarak 378410 2, Armenia. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Unanyan, RG (reprint author), Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany. RI BERGMANN, KLAAS/D-5543-2011 NR 31 TC 28 Z9 28 U1 1 U2 11 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 APR PY 2001 VL 63 IS 4 AR 043405 DI 10.1103/PhysRevA.63.043405 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422AG UT WOS:000168095300078 ER PT J AU Abrikosov, AA AF Abrikosov, AA TI Possible explanation of the pseudogap in high-temperature cuprates SO PHYSICAL REVIEW B LA English DT Article ID NORMAL-STATE; UNDERDOPED BI2SR2CACU2O8+DELTA; SUPERCONDUCTORS; GAP AB A concept describing the origin and some properties of the "pseudogap phase" of high-T-c superconducting cuprates is proposed based on the author's idea about resonant tunneling connection between the CuO2 layers. The superconducting critical temperature in this picture is defined at low doping by establishment of a three-dimensional phase correlation between the layers, and at high doping by destruction of a d-wave superconductivity by disorder. The result is a nonmonotonic behavior of T-c with doping. The pseudogap phase is analyzed qualitatively on the basis of the recently discovered existence of vortices in this phase and one-dimensional fluctuations due to extended saddle points ("hot spots"). C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Abrikosov, AA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 20 TC 17 Z9 18 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134518 DI 10.1103/PhysRevB.63.134518 PG 4 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000107 ER PT J AU Averitt, RD Rodriguez, G Lobad, AI Siders, JLW Trugman, SA Taylor, AJ AF Averitt, RD Rodriguez, G Lobad, AI Siders, JLW Trugman, SA Taylor, AJ TI Nonequilibrium superconductivity and quasiparticle dynamics in YBa2Cu3O7-delta SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; THIN-FILMS; EXCITATION SPECTRUM; T-C; SPECTROSCOPY; CONDUCTIVITY; RELAXATION; TIME; BI2SR2CACU2O8+DELTA; COHERENCE AB We have measured, using optical-pump terahertz-probe spectroscopy, the ultrafast (ab)-plane conductivity dynamics of quasiparticles and superconducting pairs in YBa2Cu3O7-delta (delta = 0, 0.5) thin films from 4 K to T-c. In optimally doped films, the recovery time for long-range phase-coherent pairing increases from similar to1.5 ps at 4 K to similar to3.5 ps near T-c, consistent with the closing of the superconducting gap. For underdoped films, the measured recovery time is temperature independent (3.5 ps) in accordance with the presence of a pseudogap. These results are compared to all optical pump-probe measurements at 1.5 eV. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Averitt, RD (reprint author), Univ Calif Los Alamos Natl Lab, MS K764, Los Alamos, NM 87545 USA. RI Rodriguez, George/G-7571-2012 OI Rodriguez, George/0000-0002-6044-9462 NR 25 TC 87 Z9 87 U1 2 U2 15 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 140502 DI 10.1103/PhysRevB.63.140502 PG 4 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800022 ER PT J AU Basov, DN Homes, CC Singley, EJ Strongin, M Timusk, T Blumberg, G van der Marel, D AF Basov, DN Homes, CC Singley, EJ Strongin, M Timusk, T Blumberg, G van der Marel, D TI Unconventional energetics of the pseudogap state and superconducting state in high-T-c cuprates SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; CONDUCTIVITY SUM-RULE; PENETRATION DEPTH; UNDERDOPED BI2SR2CACU2O8+DELTA; INTERLAYER CONDUCTIVITY; OPTICAL-PROPERTIES; SINGLE-CRYSTALS; CHARGE DYNAMICS; KINETIC-ENERGY; EFFECTIVE-MASS AB Insight into the nature of the pairing of charge carriers in high-T-c superconductors may be provided by a systematic investigation of the condensation energy. In this work we report on studies of the electronic kinetic energy across the complex phase diagram of these materials. The c-axis component of the electronic kinetic energy (determined from an analysis of the optical constants) is shown to be reduced below T-c, primarily in those compounds in which the superconducting transition at T-c is preceded by the formation of the partial gap in the density of states (pseudogap) at T*>T-c. An examination of the doping dependence of the infrared conductivity in conjunction with the results of photoemission spectroscopy suggests that the lowering of the kinetic energy is a property of the electronic states close to the intersection of the two-dimensional Fermi surface with the boundary of the Brillouin zone. We contrast the c-axis results with the energetics associated with the nodal quasiparticles probed through the in-plane conductivity. C1 Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. McMaster Univ, Dept Phys, Hamilton, ON L8S 4M1, Canada. Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA. Univ Groningen, Solid State Phys Lab, NL-9747 AG Groningen, Netherlands. RP Basov, DN (reprint author), Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RI van der Marel, Dirk/G-4618-2012 OI van der Marel, Dirk/0000-0001-5266-9847 NR 70 TC 49 Z9 49 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134514 DI 10.1103/PhysRevB.63.134514 PG 9 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000103 ER PT J AU Beckstein, O Klepeis, JE Hart, GLW Pankratov, O AF Beckstein, O Klepeis, JE Hart, GLW Pankratov, O TI First-principles elastic constants and electronic structure of alpha-Pt2Si and PtSi SO PHYSICAL REVIEW B LA English DT Article ID SILICIDES; SYSTEMS; ENERGY; GAS AB We have carried out a first-principles study of the elastic properties and electronic structure for two room-temperature stable Pt silicide phases, tetragonal alpha -Pt2Si, and orthorhombic PtSi. We have calculated all of the equilibrium structural parameters for both phases: the a and c lattice constants for alpha -Pt2Si and the a, b, and c lattice constants and four internal structural parameters for PtSi. These results agree closely with experimental data. We have also calculated the zero-pressure elastic constants, confirming prior results for pure Pt and Si and predicting values for the six (nine) independent, nonzero elastic constants of alpha -Pt2Si (PtSi). These calculations include a full treatment of all relevant internal displacements induced by the elastic strains, including an explicit determination of the dimensionless internal displacement parameters for the three strains in alpha -Pt2Si for which they are nonzero. We have analyzed the trends in the calculated elastic constants, both within each material as well as among the two silicides and the pure Pt and Si phases. The calculated electronic structure confirms that the two silicides are poor metals with a low density of states at the Fermi level, and consequently we expect that the Drude component of the optical absorption will be much smaller than in good metals such as pure Pt. This observation, combined with the topology found in the first-principles spin-orbit split band structure, suggests that it may be important to include the interband contribution to the optical absorption, even in the infrared region. C1 Univ Erlangen Nurnberg, D-91058 Erlangen, Germany. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Beckstein, O (reprint author), Univ Erlangen Nurnberg, D-91058 Erlangen, Germany. RI Beckstein, Oliver/A-3437-2008; Beckstein, Oliver/C-9095-2009; Pankratov, Oleg/C-5553-2013 OI Beckstein, Oliver/0000-0003-1340-0831; NR 45 TC 238 Z9 248 U1 1 U2 33 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134112 DI 10.1103/PhysRevB.63.134112 PG 12 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000040 ER PT J AU Bulaevskii, LN Gaifullin, MB Matsuda, Y Maley, MP AF Bulaevskii, LN Gaifullin, MB Matsuda, Y Maley, MP TI Critical current and Josephson plasma resonance in the vortex glass phase of Bi2Sr2CaCu2O8+delta SO PHYSICAL REVIEW B LA English DT Article ID LAYERED SUPERCONDUCTORS; MAGNETIC-FIELDS; LIQUID-PHASE; FREQUENCY; BI-2212; PROBE; STATE; LINE AB We calculate the field dependence of the critical current and of the Josephson plasma resonance (JPR) frequency in the macroscopically uniform vortex glass phase in highly anisotropic layered superconductors and in standard pointlike Josephson junctions when the field is applied perpendicular to the junction. In these calculations we assume that, in the single-vortex pinning regime, at low fields B, vortex positions are weakly adjusted to the Josephson coupling and we account only for the adjustment of the phase difference. Our results are in agreement with experimental data for the JPR frequency measured in the Bi2Sr2CaCu2Ox superconductor in the field range 0.03-0.6 T after field cooling. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 106, Japan. RP Bulaevskii, LN (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Gaifullin, Marat/G-4803-2015 NR 17 TC 4 Z9 4 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 140503 PG 4 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800023 ER PT J AU Cao, G McCall, S Zhou, ZX Alexander, CS Crow, JE Guertin, RP Mielke, CH AF Cao, G McCall, S Zhou, ZX Alexander, CS Crow, JE Guertin, RP Mielke, CH TI Magnetic ordering and enhanced electronic heat capacity in insulating L2RuO5 (L = Pr, Nd, Sm, Gd, and Tb) SO PHYSICAL REVIEW B LA English DT Article ID TRANSPORT-PROPERTIES; GROUND-STATE; TRANSITION; METAL; CA2RUO4 AB Polycrystalline samples of the lanthanide ruthenate series L2RuO5 (L = Pr, Nd, Sm, Gd, and Tb) magnetically order in the range 8 < T < 24 K with the ordering involving both the L and Ru cations. The series has a complex orthorhombic structure (space group Pnma) possessing chains of RuO5 five oxygen coordinated square pyramids which are corner-sharing and two inequivalent seven coordinated L sites which are edge-sharing. At T-M a weak ferromagnetic moment emerges upon cooling, most likely due to a canted antiferromagnetic spin configuration. Isothermal dc and pulsed field magnetization for T < T-M reveal field induced magnetic transitions for H < 5 T but the approach to full free ion magnetic saturation is incomplete even at fields to 60 T due to the influence of crystalline electric fields on the L ions. The low temperature linear specific heat coefficient, gamma, for four compounds is anomalously large, ranging from gamma = 229 to 774 mJ/mole K-2, for L = Nd and L = Gd, respectively. These values are comparable to those for heavy fermion systems, yet all five members of the L2RuO5 series exhibit semiconducting to insulating behavior. Isomorphic Gd2TiO5, where Ti with no unpaired d electrons (4d(0) configuration) replaces Ru (4d(4) configuration), has a vanishingly small gamma, indicating that the thermodynamic properties of L2RuO5 are dominated by unpaired 4d electrons. The 4d electrons significantly enhance the L-L interaction, as demonstrated by the dramatic increase in ordering temperature for Gd2RuO5 (T-M =10 K) compared to Gd2TiO5 which does not appear to order magnetically. C1 Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA. Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. RP Cao, G (reprint author), Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. RI McCall, Scott/G-1733-2014 OI McCall, Scott/0000-0002-7979-4944 NR 25 TC 21 Z9 21 U1 3 U2 15 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144427 PG 10 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800074 ER PT J AU Cheng, L Sturchio, NC Bedzyk, MJ AF Cheng, L Sturchio, NC Bedzyk, MJ TI Impurity structure in a molecular ionic crystal: Atomic-scale x-ray study of CaCO3 : Mn2+ SO PHYSICAL REVIEW B LA English DT Article ID STANDING-WAVE ANALYSIS; LATTICE LOCATION; LOCAL-STRUCTURE; SOLID-SOLUTIONS; TRACE-ELEMENTS; BOND LENGTHS; CALCITE; SIMULATION; DEFECTS; SPECTROSCOPY AB The lattice sites and spatial disorder of isolated Mn2+ ions in calcite were examined with x-ray standing waves, and the structure of the surrounding ions was examined with extended x-ray absorption fine-structure spectroscopy, The Mn2+ ion is found to be on-center substitutional at the Ca2+ site, with spatial disorder comparable to that of Ca2+. The first-neighbor Mn-O distance is found to be the same as that in the isostructural MnCO3. The radial distance of the closest Mn-Ca shell is reduced by similar to2% from the undistorted Ca-Ca distance. Based on these measurements, an atomic-scale structural model of the Mn2+ site suggests that the intramolecular distortion in the first-neighbor CO32- anions plays a key role in establishing the conserved first-neighbor Mn-O distance while maintaining ordering with respect to the lattice. The CaCO3:Mn2+ structure is shown to be characteristically distinct from those of analogous impurities in monatomic ionic crystals. C1 Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA. Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. Univ Illinois, Dept Earth & Environm Sci, Chicago, IL 60607 USA. Northwestern Univ, Inst Environm Catalysis, Evanston, IL 60208 USA. RP Cheng, L (reprint author), Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA. RI Bedzyk, Michael/B-7503-2009; Cheng, Likwan/C-1436-2013; Bedzyk, Michael/K-6903-2013 NR 41 TC 18 Z9 18 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144104 DI 10.1103/PhysRevB.63.144104 PG 6 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800035 ER PT J AU Errandonea, D Schwager, B Ditz, R Gessmann, C Boehler, R Ross, M AF Errandonea, D Schwager, B Ditz, R Gessmann, C Boehler, R Ross, M TI Systematics of transition-metal melting SO PHYSICAL REVIEW B LA English DT Article ID RESOLVED PHOTOELECTRON-SPECTROSCOPY; EARTHS CORE; PHASE-TRANSITIONS; HIGH-PRESSURE; ELECTRONIC-STRUCTURE; CRYSTAL-STRUCTURES; HIGH-TEMPERATURE; IRON AB We report high-pressure measurements for the melting curve of Ti, V, Cr, Mo, Ta, W, Fe, Co, and Ni. Measurements were made in a laser-heated diamond-anvil-cell to nearly 100 GPa and 4000 K. The bce metals have surprisingly small melting slopes which approach zero at high pressure. The melting curves of Co, Ni, and Fe are nearly parallel. Several ab-initio calculations for the melting of Fe are incompatible with the present results. C1 Max Planck Inst Chem, D-55020 Mainz, Germany. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Errandonea, D (reprint author), Max Planck Inst Chem, Postfach 3060, D-55020 Mainz, Germany. RI Errandonea, Daniel/J-7695-2016 OI Errandonea, Daniel/0000-0003-0189-4221 NR 30 TC 174 Z9 181 U1 3 U2 20 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 132104 DI 10.1103/PhysRevB.63.132104 PG 4 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000004 ER PT J AU Graf, MJ Hess, DW AF Graf, MJ Hess, DW TI Antiferromagnetic domains and superconductivity in UPt3 SO PHYSICAL REVIEW B LA English DT Article ID HEAVY-FERMION SUPERCONDUCTOR; UPPER CRITICAL-FIELD; ODD-PARITY SUPERCONDUCTIVITY; UNCONVENTIONAL SUPERCONDUCTOR; ORDER-PARAMETER; PHASE-DIAGRAM; MAGNETIC ORDER; THERMAL-CONDUCTIVITY; NEUTRON-DIFFRACTION; UNIAXIAL PRESSURE AB We explore the response of an unconventional superconductor to spatially inhomogeneous antiferromagnetism (SIAFM). Symmetry allows the superconducting order parameter in the E-representation models fur UPt3 to couple directly to the antiferromagnetic (AFM) order parameter. The Ginzburg-Landau equations for coupled superconductivity and SIAFM are solved numerically for two possible SIAFM configurations: Model I, abutting antiferromagnetic domains of uniform size; and Model II, quenched random disorder of "nanodomains" in a uniform AFM background. We discuss the contributions to the free energy, specific heat, and order parameter for these models. Neither model provides a satisfactory account of experiment, but results from the two models differ significantly. Our results demonstrate that the response of an E-2u superconductor to SIAFM is strongly dependent on the spatial dependence of AFM order; no conclusion can be drawn regarding the compatibility of E-2u superconductivity with UPt3 that is independent of assumptions on the spatial dependence of antiferromagnetism. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. USN, Ctr Computat Mat Sci, Res Lab, Washington, DC 20375 USA. RP Graf, MJ (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 61 TC 3 Z9 3 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134502 PG 12 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000091 ER PT J AU Guerrero, M Noack, RM AF Guerrero, M Noack, RM TI Ferromagnetism and phase separation in one-dimensional d-p and periodic Anderson models SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM RENORMALIZATION-GROUPS; KONDO-LATTICE MODEL; HUBBARD-MODEL; MAGNETIC-SUSCEPTIBILITY; ELECTRON-SYSTEMS; SUPERCONDUCTIVITY; SR2CUO3; CHAIN; DIAGRAM; DENSITY AB Using the density matrix renormalization group, we study metallic ferromagnetism in a one-dimensional copper-oxide model that contains one oxygen p orbital and one copper d orbital. The parameters for the d-p model can be chosen so that it is similar to the one-dimensional periodic Anderson model. For these parameters, we compare the ground-state phase diagram with that of the Anderson model and find a ferromagnetic region analogous to one found in the Anderson model, but which is pushed to somewhat higher densities and interaction strengths. In both models, we find a region within the ferromagnetic phase in which phase separation between a localized ferromagnetic domain and a weakly antiferromagnetic regime occurs. We then choose a set of parameter values appropriate for copper-oxide materials and explore the ground-state phase diagram as a function of the oxygen-oxygen hopping strength and the electron density. We find three disconnected regions of metallic ferromagnetism and give physical pictures of the three different mechanisms for ferromagnetism in these phases. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Fribourg, Inst Phys Theor, CH-1700 Fribourg, Switzerland. RP Guerrero, M (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 38 TC 14 Z9 14 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144423 DI 10.1103/PhysRevB.63.144423 PG 11 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800070 ER PT J AU Julien, MH Campana, A Rigamonti, A Carretta, P Borsa, F Kuhns, P Reyes, AP Moulton, WG Horvatic, M Berthier, C Vietkin, A Revcolevschi, A AF Julien, MH Campana, A Rigamonti, A Carretta, P Borsa, F Kuhns, P Reyes, AP Moulton, WG Horvatic, M Berthier, C Vietkin, A Revcolevschi, A TI Glassy spin freezing and NMR wipeout effect in the high-T-c superconductor La1.90Sr0.10CuO4: Critical discussion of the role of stripes SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HOST NUCLEAR-RESONANCE; ANTIFERROMAGNETIC CORRELATIONS; REVERSIBLE MAGNETIZATION; SINGLE-CRYSTAL; NORMAL-STATE; CU-63 NQR; MU-SR; LA2-XSRXCUO4; PHASE AB We report on La-139 and Cu-63 NMR/NQR measurements in the high-T-c superconductor La1.90Sr0.10CuO4, with T-c=26.5 K. Spin fluctuations probed by La-139 spin-lattice relaxation (T-1) continuously slow down on cooling through T-c. We argue that spin freezing and superconductivity are bulk effects in this sample. Thus both phenomena have to coexist microscopically. The distribution of La-139 T-1 values at low temperature reveals a wide spread of spin fluctuation frequencies in CuO2 planes. A simple estimate shows that Cu-63 nuclei at sites where electronic fluctuations are the slowest are not observable (wipeout effect) because relaxation times are too short. This means that the Cu-63 NQR wipeout, observed in this sample, can be explained primarily by slow magnetic, rather than charge, fluctuations. The magnetic origin of the wipeout is still compatible with a connection between wipeout and charge order [as proposed by Hunt et al., Phys. Rev. Lett. 82, 4300 (1999)], but this connection is indirect. On the other hand, since the wipeout fraction is not an intensive quantity it cannot define a proper order parameter and cannot be used by itself as a criterion for the existence of a stripe phase. C1 Dipartimento Fis A Volta, I-27100 Pavia, Italy. Unita INFM Pavia, I-27100 Pavia, Italy. Iowa State Univ, Ames Lab, Dept Phys & Astron, Ames, IA 50011 USA. Univ Grenoble 1, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France. Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France. Univ Paris 11, Lab Chim Solides, F-91405 Orsay, France. RP Dipartimento Fis A Volta, Via Bassi 6, I-27100 Pavia, Italy. EM Marc-Henri.Julien@ujf-grenoble.fr RI Berthier, Claude/D-9686-2011; Julien, Marc-Henri/A-2352-2010 OI Berthier, Claude/0000-0001-6796-0506; NR 69 TC 67 Z9 68 U1 1 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144508 DI 10.1103/PhysRevB.63.144508 PG 11 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800088 ER PT J AU Kang, JS Kim, SJ Kim, CS Olson, CG Min, BI AF Kang, JS Kim, SJ Kim, CS Olson, CG Min, BI TI Valence-band photoemission spectroscopy of the giant magnetoresistive spinel compound Fe0.5Cu0.5Cr2S4 SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; COLOSSAL MAGNETORESISTANCE; MANGANITES; MECHANISM; SULFIDES; LITHIUM; SPECTRA; FECR2S4; OXIDES; COPPER AB Electronic structures of the giant magnetoresistive Fe0.5Cu0.5Cr2S4 (FCCS) spinel compound have been investigated using photoemission spectroscopy (PES). Resonant PES measurements around the Cu, Fe, Cr 3p --> 3d absorption edges exhibit negligible resonant interference behavior for the Cu 3d valence electrons, indicating the monovalent valence state of the Cu ion in FCCS. The top of the valence band is found to be predominantly of the Cr 3d and the nearly filled Cu 3d electron character, whereas the Fe 3d electron character is distributed over the whole valence band. The measured valence-band PES spectra of FCCS yield better agreement with the LSDA + U calculation than with the local spin-density approximation (LSDA) calculation, suggesting the importance of the large Coulomb interactions U between d electrons. On the other hand, the low spectral intensity near E-F in the measured valence-band spectrum suggests an extra localization in FCCS, not explained by the large U alone. C1 Kookmin Univ, Dept Phys, Seoul 136702, South Korea. Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea. NR 33 TC 19 Z9 19 U1 1 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144412 DI 10.1103/PhysRevB.63.144412 PG 6 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800059 ER PT J AU Kiryukhin, V Kim, BG Katsufuji, T Hill, JP Cheong, SW AF Kiryukhin, V Kim, BG Katsufuji, T Hill, JP Cheong, SW TI Nanoscale anisotropic structural correlations in the paramagnetic and ferromagnetic phases of Nd0.5Sr0.5MnO3 SO PHYSICAL REVIEW B LA English DT Article ID RAY DIFFUSE-SCATTERING; DOPED MANGANITES; COLOSSAL MAGNETORESISTANCE; NEUTRON-DIFFRACTION; MAGNETIC POLARONS; LA1-XCAXMNO3; LA1-XSRXMNO3; FLUCTUATIONS; SEPARATION; COLLAPSE AB We report x-ray scattering studies of short-range structural correlations and diffuse scattering in Nd0.5Sr0.5MnO3. On cooling, this material undergoes a series of transitions, first from a paramagnetic insulating (PI) to a ferromagnetic metallic (FM) phase, and then to a charge-ordered (CO) insulating state. Highly anisotropic structural correlations were found in both the PI and FM states of this compound. The correlations increase with decreasing temperature, reaching a maximum at the CO transition temperature. Below this temperature, they abruptly collapsed. Single-polaron diffuse scattering was also observed in both the PI and FM states suggesting that substantial local lattice distortions are present in these phases. We argue that our measurements indicate that nanoscale regions exhibiting layered orbital order exist in the paramagnetic and ferromagnetic phases of Nd0.5Sr0.5MnO3. C1 Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA. Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Kiryukhin, V (reprint author), Rutgers State Univ, Dept Phys & Astron, POB 849, Piscataway, NJ 08854 USA. RI Katsufuji, Takuro/B-6283-2016 OI Katsufuji, Takuro/0000-0002-3199-1228 NR 22 TC 15 Z9 16 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144406 DI 10.1103/PhysRevB.63.144406 PG 5 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800053 ER PT J AU Kogan, VG Dobrovitski, VV Clem, JR Mawatari, Y Mints, RG AF Kogan, VG Dobrovitski, VV Clem, JR Mawatari, Y Mints, RG TI Josephson junction in a thin film SO PHYSICAL REVIEW B LA English DT Article ID GRAIN-BOUNDARIES; SUPERCONDUCTORS; YBA2CU3O7-DELTA; SYMMETRY; FLUX AB The phase difference phi (y) for a vortex at a line Josephson junction in a thin film attenuates at large distances as a power law, unlike the case of a bulk junction where it approaches exponentially the constant values at infinities. The field of a Josephson vortex is a superposition of fields of standard Pearl Vortices distributed along the junction with the line density phi'(y)/2 pi. We study the integral equation for phi (y) and show that the phase is sensitive to the ratio l/Lambda, where l = lambda (2)(J)/lambda (L), Lambda = 2 lambda (2)(L)/d, lambda (L), and lambda (J) are the London and Josephson penetration depths, and d is the film thickness. For l< T-c. For l >>Lambda, bath the core and the tail have nearly the same characteristic length rootl Lambda. C1 Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Electrotech Lab, Frontier Technol Div, Tsukuba, Ibaraki 3058568, Japan. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel. RP Kogan, VG (reprint author), Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. RI Mints, Roman/A-5091-2008 NR 13 TC 35 Z9 35 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144501 DI 10.1103/PhysRevB.63.144501 PG 9 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800081 ER PT J AU Leung, K AF Leung, K TI First-principles study of Ca2+ and Mn2+ substituents in KTaO3 SO PHYSICAL REVIEW B LA English DT Article ID PERIODIC BOUNDARY-CONDITIONS; GENERALIZED GRADIENT APPROXIMATION; ELECTRON-PARAMAGNETIC RESONANCE; AB-INITIO CALCULATIONS; MINIMUM ENERGY PATHS; ELASTIC BAND METHOD; LI-DOPED KTAO3; FERROELECTRIC PEROVSKITES; MOLECULAR-DYNAMICS; GLASSY PROPERTIES AB The structural properties, energetics, and dynamics of Ca2+ and Mn2+ substituents in KTaO3 are investigated from first principles. It is found that Ca substitutes for both K and Ta ions. Oxygen vacancies bind to isolated Ca ions residing at Ta sites, causing off-center Ca displacement and forming large dipoles. There is also evidence that oppositely charged defects may cluster together. Our calculations predict that the activation energy for dipole reorientation via oxygen vacancy hopping within the first-neighbor shell of Ta-substituting Ca or. Mn exceeds 2 eV. On the other hand, Mn2+ substituting at the K site displaces off center along the (100) direction, also forming a dipole. This dipole can reorient via Mn hopping motion with an activation energy of similar to0.18 eV, in reasonable agreement with experiments. We argue that, in general, metal ion hopping at the A site, not oxygen vacancy hopping, is responsible for the small activation energies found in experiments. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, Mail Stop 1421, Albuquerque, NM 87185 USA. NR 65 TC 20 Z9 20 U1 1 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134415 DI 10.1103/PhysRevB.63.134415 PG 11 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000065 ER PT J AU Liu, XD Berger, A Wuttig, M AF Liu, XD Berger, A Wuttig, M TI Stability of the perpendicular magnetic anisotropy of ultrathin Ni films on Cu(100) upon multiple magnetization reversals SO PHYSICAL REVIEW B LA English DT Article ID THIN-FILMS; CO; MAGNETORESISTANCE; MULTILAYERS; TRANSITION; CU(001); MISFIT; NICKEL; GROWTH; LAYERS AB Ultrathin Ni films with perpendicular magnetic anisotropy were deposited on Cu(100) at room temperature. The magnetic properties of the films were measured upon multiple magnetization reversals in an alternating magnetic field using the magneto-optic Kerr effect. All magnetic properties remain virtually constant for up to 10(6) magnetization reversals for all films studied. This finding is supported by a simple theoretical model. C1 Forschungszentrum Julich, Inst Grenzflachenforsch & Vakuumphys, D-52428 Julich, Germany. Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Liu, XD (reprint author), Forschungszentrum Julich, Inst Grenzflachenforsch & Vakuumphys, D-52428 Julich, Germany. RI Wuttig, Matthias/A-8860-2012; Berger, Andreas/D-3706-2015 OI Wuttig, Matthias/0000-0003-1498-1025; Berger, Andreas/0000-0001-5865-6609 NR 32 TC 5 Z9 5 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144407 DI 10.1103/PhysRevB.63.144407 PG 5 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800054 ER PT J AU Maat, S Hellwig, O Zeltzer, G Fullerton, EE Mankey, GJ Crow, ML Robertson, JL AF Maat, S Hellwig, O Zeltzer, G Fullerton, EE Mankey, GJ Crow, ML Robertson, JL TI Antiferromagnetic structure of FePt3 films studied by neutron scattering SO PHYSICAL REVIEW B LA English DT Article ID EXCHANGE BIASED FILMS; ANISOTROPY AB The magnetism of antiferromagnetic FexPt1-x thin films (x = 0.27 and 0.30) epitaxially grown onto MgO (110) and a-axis sapphire (alpha -Al2O3) substrates has been studied by elastic neutron and x-ray scattering. Bulk chemically ordered FePt3 exhibits an antiferromagnetic spin structure with a wave vector Q(1) =2 pi /a(1/2 1/2 0) below T(N1)similar to 160 K. For slightly Fe-rich alloys (x greater than or similar to0.26) a spin-reorientation transition ti, a second antiferromagnetic phase with a wave vector Q(2) = 2 pi /a(1/2 00) occurs below T(N2)similar to 100 K at the expense of Q(1). For increased Fe content (x similar to0.30) the Q(1) phase is strongly suppressed with a dominant Q(2) phase. For (111)-oriented films grown on a-axis sapphire the spin structure is the same as that found in the bulk. The a = 0.27 film exhibits transitions at T-N1 and T-N2. The film with x = 0.30 exhibits an almost completely suppressed Q(1) phase and a dominant Q(2) phase with an enhanced ordering temperature of T(N2)similar to 140 K. In contrast FePt3 (110) films grown onto MgO (110) exhibit only the el phase for both compositions x = 0.27 and x = 0.30 with the onset of the Q(2) phase suppressed. The distinct behavior of the films grown onto MgO from those grown onto a-axis sapphire and bulk FePt3 may be explained by higher strain and defect densities incorporated in the films grown onto MgO. C1 IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA. Univ Alabama, Tuscaloosa, AL 35401 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Maat, S (reprint author), IBM Corp, Almaden Res Ctr, 650 Harry Rd, San Jose, CA 95120 USA. RI Fullerton, Eric/H-8445-2013; Mankey, Gary/G-9110-2011; Zeltzer, Gabriel/L-1475-2016 OI Fullerton, Eric/0000-0002-4725-9509; Mankey, Gary/0000-0003-3163-5159; Zeltzer, Gabriel/0000-0001-7573-4170 NR 19 TC 38 Z9 38 U1 3 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134426 DI 10.1103/PhysRevB.63.134426 PG 8 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000076 ER PT J AU Norman, MR Kaminski, A Mesot, J Campuzano, JC AF Norman, MR Kaminski, A Mesot, J Campuzano, JC TI Temperature evolution of the spectral peak in high-temperature superconductors SO PHYSICAL REVIEW B LA English DT Article ID T-C SUPERCONDUCTORS; ANGLE-RESOLVED PHOTOEMISSION; THERMAL HALL CONDUCTIVITY; LINE-SHAPE; BI2SR2CACU2O8+DELTA; STATE; DISPERSION; YBA2CU3O7 AB Recent photoemission data in the high-temperature cuprate superconductor Bi2212 have been interpreted in terms of a sharp spectral peak with a temperature-independent lifetime, whose weight strongly decreases upon heating. By a detailed analysis of the data, we are able to extract the temperature dependence of the electron self-energy, and demonstrate that this interpretation is misleading. Rather, the spectral peak loses its integrity above T-c due to a large reduction in the electron lifetime. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Illinois, Dept Phys, Chicago, IL 60607 USA. Swiss Fed Inst Technol, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. PSI, CH-5232 Villigen, Switzerland. RP Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Norman, Michael/C-3644-2013 NR 21 TC 21 Z9 21 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 140508 DI 10.1103/PhysRevB.63.140508 PG 4 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800028 ER PT J AU Pagliuso, PG Thompson, JD Sarrao, JL Sercheli, MS Rettori, C Martins, GB Fisk, Z Oseroff, SB AF Pagliuso, PG Thompson, JD Sarrao, JL Sercheli, MS Rettori, C Martins, GB Fisk, Z Oseroff, SB TI Crystal field study in rare-earth-doped LuInNi4 SO PHYSICAL REVIEW B LA English DT Article ID VALENCE PHASE-TRANSITION; ELECTRON-SPIN-RESONANCE; NEUTRON-SCATTERING; = AG; YBXCU4; YBXIN1-XCU2; BEHAVIOR; YBINCU4; MODEL; ND3+ AB Magnetic susceptibility and electron spin resonance experiments in the rare earth (R = Nd, Er, and Yb) 5-25% doped cubic intermetallic LuInNi4 enable estimates of the fourth A(4) and sixth A(6) order crystal-field parameters for this compound. These parameters yield a Gamma (6) doublet, a Gamma (7) doubler, and a Gamma (8) quartet as the ground states for Nd3+, Er3+, and Yb3+, respectively, and an overall crystal-field splitting of 100-300 K. The A(4) and A(6) parameters are found to have comparable order of magnitude for all the R studied and their values are in agreement with reported values for other cubic systems. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. UNICAMP, Inst Fis Gleb Wataghin, BR-13038970 Campinas, SP, Brazil. Florida State Univ, NHMFL, Tallahassee, FL 32306 USA. San Diego State Univ, San Diego, CA 92182 USA. RP Pagliuso, PG (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Rettori, Carlos/C-3966-2012; Pagliuso, Pascoal/C-9169-2012; Martins, George/C-9756-2012; Inst. of Physics, Gleb Wataghin/A-9780-2017 OI Rettori, Carlos/0000-0001-6692-7915; Martins, George/0000-0001-7846-708X; NR 33 TC 0 Z9 0 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144430 PG 5 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800077 ER PT J AU Romero, DB Moritomo, Y Mitchell, JF Drew, HD AF Romero, DB Moritomo, Y Mitchell, JF Drew, HD TI Competition of charge, orbital, and ferromagnetic correlations in layered manganites SO PHYSICAL REVIEW B LA English DT Article ID GIANT MAGNETORESISTANCE; RAMAN-SPECTROSCOPY; ELECTRONIC-STRUCTURE; TRANSPORT-PROPERTIES; MANGANESE OXIDES; LA1.2SR1.8MN2O7; LASR2MN2O7; TRANSITION; SCATTERING; SPECTRA AB The competition of charge, orbital, and ferromagnetic interactions in layered manganites is investigated by magneto-Raman scattering spectroscopy. We find that the colossal magnetoresistance effect in the layered compounds results from the interplay of orbital and ferromagnetic double exchange correlations. inelastic scattering by charge-order fluctuations dominates the quasiparticle dynamics in the ferromagnetic-metal state. It is suppressed at low frequencies, consistent with the opening of a charge-density wave pseudogap. C1 NIST, Gaithersburg, MD 20899 USA. Univ Maryland, Dept Phys, College Pk, MD 20742 USA. Nagoya Univ, CIRSE, Nagoya, Aichi 46401, Japan. Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 46401, Japan. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Romero, DB (reprint author), NIST, Gaithersburg, MD 20899 USA. NR 28 TC 12 Z9 12 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 132404 DI 10.1103/PhysRevB.63.132404 PG 4 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000014 ER PT J AU Schmiedeshoff, GM Detwiler, JA Beyermann, WP Lacerda, AH Canfield, PC Smith, JL AF Schmiedeshoff, GM Detwiler, JA Beyermann, WP Lacerda, AH Canfield, PC Smith, JL TI Critical fields and specific heat of LuNi2B2C SO PHYSICAL REVIEW B LA English DT Article ID HIGH MAGNETIC-FIELDS; DEPENDENT SPECIFIC-HEAT; S-WAVE SUPERCONDUCTORS; SINGLE-CRYSTAL; ELECTRONIC-STRUCTURE; LOW-TEMPERATURE; ORDERED STATE; YNI2B2C; VORTEX; BOROCARBIDES AB We have measured the upper critical magnetic field, lower critical magnetic field, and low-temperature specific heat of LuNi2B2C. Our upper critical-field measurements above similar to2 K are consistent with earlier measurements by other groups. The upper critical field exhibits a finite slope as T-->0, and we discuss possible origins of this very unusual behavior. We observe a linear temperature dependence for the lower critical field of our single-crystal sample, a temperature dependence that disagrees with earlier measurements on polycrystals and suggests that the lower critical field may be anisotropic. The Sommerfeld coefficient increases with magnetic field as H-epsilon with epsilon = 0.63 +/- 0.12 in qualitative agreement with earlier work. The temperature dependence of the zero-field electronic specific heat is exponential well below T-c. We discuss our results in light of recent proposals of both anisotropic s-wave and d-wave superconductivity for LuNi2B2C. Our data seem most consistent with strong-coupling superconductivity and a weakly anisotropic s-wave energy gap. C1 Occidental Coll, Dept Phys, Los Angeles, CA 90041 USA. Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Schmiedeshoff, GM (reprint author), Occidental Coll, Dept Phys, Los Angeles, CA 90041 USA. RI Canfield, Paul/H-2698-2014 NR 68 TC 17 Z9 17 U1 1 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134519 DI 10.1103/PhysRevB.63.134519 PG 7 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000108 ER PT J AU Staub, U Shi, M O'Conner, AG Kramer, MJ Knapp, M AF Staub, U Shi, M O'Conner, AG Kramer, MJ Knapp, M TI Site-specific electronic structure of Pr in Pr1+xBa2-xCu3O7-delta SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-ABSORPTION; NORMAL STATE PROPERTIES; SUPERCONDUCTIVITY SUPPRESSION; NEUTRON-DIFFRACTION; OXIDATION-STATE; VALENCE STATE; BA; SPECTROSCOPY; PRBA2CU3O7; RARE AB We report on resonant x-ray powder-diffraction measurements in the vicinity of the Pr L-3 absorption edge of Pr1-xBa2-xCu3O7-delta. The Pr site occupation has been accurately determined: 6 +/- 2% of the Pr is on the Ba site. From an analysis of the energy dependence of selected Bra,og reflections, the site-specific oxidation state of Pr has been obtained. These results are discussed in the context of models describing the suppression of superconductivity by Pr, and they indicate that Pr on the R site is responsible for T-c suppression. C1 Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland. Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. Darmstadt Univ Technol, Inst Mat Sci, D-64287 Darmstadt, Germany. RP Staub, U (reprint author), Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland. RI Knapp, Michael/B-4258-2014; Staub, Urs/C-4914-2015 OI Knapp, Michael/0000-0003-0091-8463; NR 34 TC 4 Z9 5 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 13 AR 134522 DI 10.1103/PhysRevB.63.134522 PG 7 WC Physics, Condensed Matter SC Physics GA 418MB UT WOS:000167895000111 ER PT J AU Tchernyshyov, O Norman, MR Chubukov, AV AF Tchernyshyov, O Norman, MR Chubukov, AV TI Neutron resonance in high-T-c superconductors is not the pi particle SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; MAGNETIC EXCITATIONS; J MODEL; SCATTERING; YBA2CU3O7; PEAK; BILAYER AB We discuss the interplay of particle-particle and particle-hole spin-triplet channels in high-T-c superconductors using a quasiparticle dispersion motivated by angle-resolved photoemission. Within a generalized random-phase approximation, we find a well-defined antibound state of two holes, the pi resonance of Demler and Zhang, as well as a bound state of a particle and a hole, the spin exciton. We show that the energy of the pi resonance always exceeds 2 Delta, twice the maximum d-wave gap, therefore the neutron resonance observed in the cuprates around energy Delta is most likely a spin exciton. At the same time, we speculate that the pi particle can exist at higher energies and might be observed in neutron scattering around 100 meV. C1 Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. RP Inst Adv Study, Sch Nat Sci, Olden Lane, Princeton, NJ 08540 USA. RI Norman, Michael/C-3644-2013 NR 31 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 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144507 DI 10.1103/PhysRevB.63.144507 PG 5 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800087 ER PT J AU Wang, RH Gui, JI Zhu, YM Moodenbaugh, AR AF Wang, RH Gui, JI Zhu, YM Moodenbaugh, AR TI Crystallographic analysis of orientational domain variants and charge-ordered domains in La0.33Ca0.67MnO3 SO PHYSICAL REVIEW B LA English DT Article ID LA1-XCAXMNO3; LA0.5CA0.5MNO3; TRANSITIONS; STRIPES AB We present a study on the origin of twinning and antiphase domains and their relationship to charge ordering in Lao(0.33)Ca(0.67)MnO(3). The evolution of these orientational and charge-ordered domains is attributed to the reduction of the crystal symmetry due to the cubic to orthorhombic and, at the charge ordering temperature T-c, to low-temperature orthorhombic (LTO) phase transformations. The process was predicted by group theory analysis and observed with transmission electron microscopy. In both orthorhombic phases the orientation domain has six variants with 15 possible domain boundaries which can be classified as two types of reflection twins, the 90 degrees /m{100} and the 120 degrees /m{110} twins. Two kinds of antiphase domains and their domain interfaces, associated with the loss of translation symmetry, with lattice shifts of a(co)/3 and a(co)/2 also were predicted and observed for the LTO phase. This work suggests that the twin domains, which occur well above T-c, are not caused by charge ordering. However, the antiphase domains, which can account for the observed small eo component of the incommensurate modulation at low temperature, are directly related to charge and orbital ordering in La0.33Ca0.67MnO3. Our study clarifies the widespread misunderstanding of twinning being equivalent to charge ordering in the system. C1 Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China. RP Zhu, YM (reprint author), Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. EM zhu@bnl.gov NR 18 TC 31 Z9 33 U1 2 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 2001 VL 63 IS 14 AR 144106 DI 10.1103/PhysRevB.63.144106 PG 10 WC Physics, Condensed Matter SC Physics GA 421HW UT WOS:000168059800037 ER PT J AU Abfalterer, WP Bateman, FB Dietrich, FS Finlay, RW Haight, RC Morgan, GL AF Abfalterer, WP Bateman, FB Dietrich, FS Finlay, RW Haight, RC Morgan, GL TI Measurement of neutron total cross sections up to 560 MeV SO PHYSICAL REVIEW C LA English DT Article ID OPTICAL-MODEL ANALYSIS; SIMPLE RAMSAUER MODEL; HARD-CORE INTERACTION; WIDE MASS RANGE; INTERMEDIATE ENERGIES; ELASTIC-SCATTERING; ELECTRON-SCATTERING; NUCLEON-SCATTERING; DEPENDENCE; PB-208 AB We have completed a new set of total cross section measurements of 31 elements and isotopes spanning the periodic table from A = 1 to 238. We employed the same technique as in Finley et al. [Phys. Rev. C 47, 237 (1993)] with refinements intended to allow measurements on separated isotopes and improved systematic error control. The goal of the new measurement was 1% statistical accuracy in 1% energy bins with systematic errors less than 1%. This was achieved for all but the thinnest samples. Stringent checks of systematic errors in this measurement resulted in a reassignment of systematic uncertainties to the neutron total cross sections reported in Finley et al. Microscopic optical model calculations were carried out to interpret the results of the experiment. Two specific types of optical models were employed. The Jeukenne-Lejeune-Mahaux model was used in the range of 5-160 MeV, and a model based on the empirical effective interaction of Kelly was used from 135 to 650 MeV. These models are shown to be useful for predicting both neutron total cross sections and proton reaction cross sections. They are particularly important for light nuclei, for which standard global phenomenological parametrizations of the optical potential are insufficiently accurate. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Ohio Univ, Athens, OH 45701 USA. RP Abfalterer, WP (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 48 TC 107 Z9 111 U1 0 U2 1 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 APR PY 2001 VL 63 IS 4 AR 044608 DI 10.1103/PhysRevC.63.044608 PG 19 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900049 ER PT J AU Diaconescu, L Schiavilla, R van Kolck, U AF Diaconescu, L Schiavilla, R van Kolck, U TI Parity-violating electron-deuteron scattering SO PHYSICAL REVIEW C LA English DT Article ID ANAPOLE FORM-FACTOR; FEW-BODY NUCLEI; RADIATIVE-CAPTURE; MOMENTUM-TRANSFER; HE-3; ELECTRODISINTEGRATION; DISINTEGRATION; TRINUCLEONS; THRESHOLD; PROTONS AB The longitudinal asymmetry due to Z(0) exchange is calculated in quasielastic electron-deuteron scattering at momentum transfers \Q(2)\ similar or equal to 0.1GeV(2) relevant for the SAMPLE experiment. The deuteron and pn-scattering-state wave functions are obtained from solutions of a Schrodinger equation with the Argonne v(18) potential. Electromagnetic and weak neutral one- and two-nucleon currents are included in the calculation. The two-nucleon currents of pion range are shown to be identical to those derived in chiral perturbation theory. The results indicate that two-body contributions to the asymmetry are small (similar or equal to 0.2%) around the quasielastic peak, but become relatively more significant (similar or equal to 3%) in the high-energy wing of the quasielastic peak. C1 CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA. Jefferson Lab, Newport News, VA 23606 USA. Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA. Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. RP Diaconescu, L (reprint author), CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA. NR 43 TC 14 Z9 14 U1 0 U2 0 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 APR PY 2001 VL 63 IS 4 AR 044007 DI 10.1103/PhysRevC.63.044007 PG 11 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900009 ER PT J AU Dioszegi, I Mazumdar, I Shaw, NP Paul, P AF Dioszegi, I Mazumdar, I Shaw, NP Paul, P TI Level densities in hot Sn-12, La-131, and Ce-134 nuclei from giant dipole resonance gamma decay SO PHYSICAL REVIEW C LA English DT Article ID VISCOSITY; FISSION; CF-252 AB We have measured high-energy gamma rays up to E-y=23 MeV from three highly excited medium mass nuclei, Sn-112, La-131, and Ce-134. The absolute La-131 gamma -ray multiplicity has been compared to statistical model calculation without any normalization. We have found that level density prescriptions of Pulhofer and Ignatyuk-Smirenkin-Tishin-Reisdorf fit the data with giant dipole resonance centroid energy and width taken from systematics, whereas the experimental level density parameters of Budtz-Jorgensen and Knitter fail to fit the data. C1 SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Dioszegi, I (reprint author), SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. NR 14 TC 14 Z9 14 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 EI 1089-490X J9 PHYS REV C JI Phys. Rev. C PD APR PY 2001 VL 63 IS 4 AR 047601 DI 10.1103/PhysRevC.63.047601 PG 4 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900073 ER PT J AU Hanhart, C Miller, GA Myhrer, F Sato, T van Kolck, U AF Hanhart, C Miller, GA Myhrer, F Sato, T van Kolck, U TI Toy model for pion production in nucleon-nucleon collisions SO PHYSICAL REVIEW C LA English DT Article ID CHIRAL PERTURBATION-THEORY; REACTION NEAR-THRESHOLD; POWER COUNTING APPROACH; CROSS-SECTION; PP->PP-PI(0) AB We develop a toy model for pion production in nucleon-nucleon collisions that reproduces some of the features of the chiral Lagrangian calculations. We calculate the production amplitude and examine some common approximations. C1 Univ Washington, Dept Phys, Seattle, WA 98195 USA. Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA. Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. CALTECH, Kellogg Radiat Lab 106 38, Pasadena, CA 91125 USA. RP Hanhart, C (reprint author), Univ Washington, Dept Phys, Seattle, WA 98195 USA. OI Hanhart, Christoph/0000-0002-3509-2473 NR 21 TC 17 Z9 17 U1 0 U2 0 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 APR PY 2001 VL 63 IS 4 AR 044002 DI 10.1103/PhysRevC.63.044002 PG 7 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900004 ER PT J AU Hartley, DJ Galindo-Uribarri, A Baktash, C Carpenter, MP Danchev, M Devlin, M Gross, CJ Janssens, RVF Lipoglavsek, M Padilla, E Paul, SD Radford, DC Reviol, W Riedinger, LL Sarantites, DG Seweryniak, D Yu, CH Zeidan, O AF Hartley, DJ Galindo-Uribarri, A Baktash, C Carpenter, MP Danchev, M Devlin, M Gross, CJ Janssens, RVF Lipoglavsek, M Padilla, E Paul, SD Radford, DC Reviol, W Riedinger, LL Sarantites, DG Seweryniak, D Yu, CH Zeidan, O TI First evidence of excited states in the near-drip-line nucleus Pr-126 and signature inversion in A approximate to 130 nuclei SO PHYSICAL REVIEW C LA English DT Article ID ODD-ODD NUCLEI; ROTATIONAL BANDS; SPECTROSCOPY; TRIAXIALITY AB gamma -ray transitions have been identified for the first time in the near-drip-line nucleus Pr-126, making it the lightest odd-odd praseodymium nucleus in which excited states have been reported. Evidence is presented for two rotational bands in Pr-126, one strongly coupled and the other doubly decoupled. In addition, the preliminary reports of a band in Pr-128 are confirmed. The signature inversion phenomenon and trends in the energy staggering of the pih(11/2)nuh(11/2) bands are discussed for the Cs, La, and Pr nuclei. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Washington Univ, Dept Chem, St Louis, MO 63130 USA. Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. St Kliment Ohridsky Univ Sofia, Fac Phys, BG-1164 Sofia, Bulgaria. RP Hartley, DJ (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RI Devlin, Matthew/B-5089-2013; radford, David/A-3928-2015; Carpenter, Michael/E-4287-2015 OI Devlin, Matthew/0000-0002-6948-2154; Carpenter, Michael/0000-0002-3237-5734 NR 37 TC 17 Z9 17 U1 0 U2 1 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 APR PY 2001 VL 63 IS 4 AR 041301 DI 10.1103/PhysRevC.63.041301 PG 5 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900001 ER PT J AU Jalilian-Marian, J Orginos, K Sarcevic, I AF Jalilian-Marian, J Orginos, K Sarcevic, I TI Prompt photons from relativistic heavy ion collisions SO PHYSICAL REVIEW C LA English DT Article ID QUARK-GLUON PLASMA; RADIATIVE ENERGY-LOSS; SMALL-X; NUCLEI; QCD; FRAGMENTATION; DENSITY AB We calculate the inclusive cross section for prompt photon production in heavy-ion collisions at RHIC energies (roots=130 GeV and roots=200 GeV) in the central rapidity region including next-to-leading order, O(alpha (em)alpha (2)(s)), radiative corrections, initial state nuclear shadowing, and parton energy loss effects. We show that there is a significant suppression of the nuclear cross section, up to similar to 30% at roots=200 GeV, due to shadowing and medium induced parton energy loss effects. We find that the next-to-leading order contributions are large and have a strong p(t) dependence. C1 Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. RP Jalilian-Marian, J (reprint author), Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. OI Orginos, Kostas/0000-0002-3535-7865 NR 39 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 2001 VL 63 IS 4 AR 041901 DI 10.1103/PhysRevC.63.041901 PG 4 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900002 ER PT J AU Narro, JG Longour, C Regan, PH Blank, B Pearson, CJ Lewitowicz, M Miehe, C Gelletly, W Appelbe, D Axelsson, L Bruce, AM Catford, WN Chandler, C Clark, RM Cullen, DM Czajkowski, S Daugas, JM Dessagne, P Fleury, A Frankland, L Giovinazzo, J Greenhalg, B Grzywacz, R Harder, M Jones, KL Kelsall, N Kszczot, T Page, RD Reed, AT Sorlin, O Wadsworth, R AF Narro, JG Longour, C Regan, PH Blank, B Pearson, CJ Lewitowicz, M Miehe, C Gelletly, W Appelbe, D Axelsson, L Bruce, AM Catford, WN Chandler, C Clark, RM Cullen, DM Czajkowski, S Daugas, JM Dessagne, P Fleury, A Frankland, L Giovinazzo, J Greenhalg, B Grzywacz, R Harder, M Jones, KL Kelsall, N Kszczot, T Page, RD Reed, AT Sorlin, O Wadsworth, R TI Fermi superallowed beta(+) decays and T=1 ground states of heavy odd-odd N=Z nuclei SO PHYSICAL REVIEW C LA English DT Article ID RP-PROCESS; ISOMERIC STATES; BETA+/EC-DECAY; ENERGY-LOSS; HALF-LIVES; FRAGMENTATION; IDENTIFICATION; STABILITY; ISOTOPES; POINT AB The beta (+) -decay half-lives of the neutron-deficient odd-odd N=Z nuclei Rb-74, Y-78, Nb-82, and Tc-86 have been measured following the fragmentation of a primary Mo-92 beam at an energy of 60 MeV per nucleon at the GANIL laboratory, France. This was achieved by correlating beta (+) decays with the implantation of unambiguously identified fragments at the final focus of the LISE3 separator. The deduced log(10)ft(1/2) values are consistent with 0(+)-->0(+). Fermi superallowed transitions, which together with the measured beta (+)-detection efficiencies, suggest T=1, I-pi=0(+) ground states for these odd-odd N=Z nuclei. These data represent the heaviest N=Z systems for which Fermi superallowed decays have been established. C1 Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England. Univ Strasbourg 1, Inst Rech Subatom Strasbourg, F-67037 Strasbourg 2, France. CEN Bordeaux Gradignan, F-33175 Gradignan, France. Grand Accelerateur Natl Ions Lourds, F-14021 Caen, France. Univ Liverpool, Oliver Lodge Lab, Liverpool L69 3BX, Merseyside, England. Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden. Univ Brighton, Brighton BN2 4GJ, E Sussex, England. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ York, Dept Phys, York Y01 4DD, N Yorkshire, England. Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland. Inst Phys Nucl, F-91406 Orsay, France. RP Narro, JG (reprint author), Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England. RI Jones, Katherine/B-8487-2011; harder, marie/D-3157-2013 OI Jones, Katherine/0000-0001-7335-1379; harder, marie/0000-0002-1811-4597 NR 50 TC 21 Z9 21 U1 0 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 APR PY 2001 VL 63 IS 4 AR 044307 PG 9 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900023 ER PT J AU Poli, GL Davids, CN Woods, PJ Seweryniak, D Carpenter, MP Cizewski, JA Davinson, T Heinz, A Janssens, RVF Lister, CJ Ressler, JJ Sonzogni, AA Uusitalo, J Walters, WB AF Poli, GL Davids, CN Woods, PJ Seweryniak, D Carpenter, MP Cizewski, JA Davinson, T Heinz, A Janssens, RVF Lister, CJ Ressler, JJ Sonzogni, AA Uusitalo, J Walters, WB TI Proton and alpha radioactivity of Bi-185 SO PHYSICAL REVIEW C LA English DT Article ID Z=82 SHELL CLOSURE; INTRUDER STATE; DECAY; ISOTOPES; NUCLEI; BI; TL AB Proton and alpha emission from Bi-185 have been confirmed and measured with improved statistics. The Bi-185 nuclei were produced via the Mo-95(Mo-92,pn) reaction at a bombarding energy of 420 MeV. The proton decay energy from the 1/2(+) intruder state in Bi-185 to the Pb-184 ground state was measured to be 1.598(16) MeV with a proton branching ratio b(p)=0.85(6). An alpha decay branch from the same state was measured, b(alpha)=0.15(6), with an energy of 8.08(3) MeV. The state has a half-life of 50(8) mus. In addition, the alpha branching ratio of the ground state of Pb-184 was determined for the first time to be b(alpha)= 0.23(14). C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. Univ Maryland, Dept Chem, College Pk, MD 20742 USA. Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA. RP Poli, GL (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RI Ressler, Jennifer Jo/F-2279-2010; Heinz, Andreas/E-3191-2014; Carpenter, Michael/E-4287-2015 OI Carpenter, Michael/0000-0002-3237-5734 NR 14 TC 34 Z9 34 U1 0 U2 1 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 APR PY 2001 VL 63 IS 4 AR 044304 DI 10.1103/PhysRevC.63.044304 PG 3 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900020 ER PT J AU Renne, PR Norman, EB AF Renne, PR Norman, EB TI Determination of the half-life of Ar-37 by mass spectrometry SO PHYSICAL REVIEW C LA English DT Article ID ABSOLUTE AGES AB The half-life of Ar-37 has been determined via mass spectrometry by measuring the ratio of Ar-37 to stable Ar-36 as a function of time in neutron-irradiated samples of CaF2. The half-life we obtain is 34.95+/-0.08 d (95% confidence level). This result is compared to previous experiments based on radioactivity measurements. C1 Berkeley Geochronol Ctr, Berkeley, CA 94709 USA. Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Renne, PR (reprint author), Berkeley Geochronol Ctr, 2455 Ridge Rd, Berkeley, CA 94709 USA. NR 14 TC 15 Z9 15 U1 0 U2 2 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 APR PY 2001 VL 63 IS 4 AR 047302 DI 10.1103/PhysRevC.63.047302 PG 3 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900066 ER PT J AU Smolanczuk, R AF Smolanczuk, R TI Formation of superheavy elements in cold fusion reactions SO PHYSICAL REVIEW C LA English DT Article ID CROSS-SECTIONS; ALPHA-DECAY; NUCLEI; EVAPORATION; DYNAMICS; HEAVY AB We calculate the formation cross sections of transactinides (superheavy elements), as well as heavy actinides (No and Lr), which have been or might be obtained in fusion reactions with the evaporation of only one neutron. We use both more realistic fusion barrier and survival probability of the compound nucleus in comparison with the original phenomenological model [Phys. Rev. C 59, 2634 (1999)] that prompted the Berkeley experiment on the synthesis of a new superheavy element 118 [Phys. Rev. Lett. 83, 1104 (1999)]. Calculations are performed for asymmetric and symmetric target-projectile combinations and for reactions with stable and radioactive-ion beams. The formation cross sections measured at GSI-Darmstadt for transactinides and heavy actinides, as well as that for superheavy element 118 reported by the LBNL-Berkeley group, are reproduced within a factor of 2.4, on average. Based on the obtained relatively large cross sections, we predict that optimal reactions with stable beams for the synthesis of so far unobserved superheavy elements 119, 120, and 121 are Bi-209(Kr-86, 1n)(294)119, Pb-208(Sr-88, 1n)(295)120, and Bi-209(Sr-88, 1n)(296)121, respectively. This is because of the magic of both the target and the projectile that leads to larger Q value and, consequently, lower effective fusion barrier with larger transmission probability. The same effect is responsible for relatively large cross sections predicted for the symmetric reactions Xe-136(Sn-124, 1n)(259)Rf, Xe-136(Xe-136, 1n)(271)Hs, Ba-138(Xe-138, 1n)(273)110, and Ce-140(Xe-136, 1n)(275)112. Although shell effects in the magic nuclei Sn-124, Xe-136, Ba-138, and Ce-140 are not as strong as in Pb-208 and Bi-209, they act on both the target and the projectile and lead to the prediction of measurable cross sections. C1 Soltan Inst Nucl Studies, Nucl Theory Dept, PL-00681 Warsaw, Poland. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Smolanczuk, R (reprint author), Soltan Inst Nucl Studies, Nucl Theory Dept, Hoza 69, PL-00681 Warsaw, Poland. EM smolan@fuw.edu.pl NR 41 TC 45 Z9 45 U1 0 U2 4 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 APR PY 2001 VL 63 IS 4 AR 044607 DI 10.1103/PhysRevC.63.044607 PG 8 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900048 ER PT J AU Wong, CY Crater, HW AF Wong, CY Crater, HW TI Relativistic N-body problem in a separable two-body basis SO PHYSICAL REVIEW C LA English DT Article ID 2-BODY DIRAC EQUATIONS; BETHE-SALPETER-EQUATION; GENERAL COVARIANT INTERACTIONS; QUARK POTENTIAL MODEL; CONSTRAINT THEORY; CROSS-SECTIONS; WAVE-EQUATIONS; PARTICLES; MECHANICS; SCATTERING AB We use Dirac's constraint dynamics to obtain a Hamiltonian formulation of the relativistic N-body problem in a separable two-body basis in which the particles interact pairwise through scalar and vector interactions. The resultant N-body Hamiltonian is relativistically covariant. It can be easily separated in terms of the center of mass and the relative motion of any two-body subsystem. It can also be separated into an unperturbed Hamiltonian with a residual interaction. In a system of two-body composite particles, the solutions of the unperturbed Hamiltonian are relativistic two-body internal states, each of which can be obtained by solving a relativistic Schrodinger-like equation. The resultant two-body wave functions can be used as basis states to evaluate reaction matrix elements in the general N-body problem. We prove a relativistic version of the post-prior equivalence which guarantees a unique evaluation of the reaction matrix element, independent of the ways of separating the Hamiltonian into unperturbed and residual interactions. Since an arbitrary reaction matrix element involves composite particles in motion, we show explicitly how such matrix elements can be evaluated in terms of the wave functions of the composite particles and the relevant Lorentz transformations. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea. Univ Tennessee, Inst Space, Dept Phys, Tullahoma, TN 37388 USA. RP Wong, CY (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 71 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 2001 VL 63 IS 4 AR 044907 DI 10.1103/PhysRevC.63.044907 PG 18 WC Physics, Nuclear SC Physics GA 421HX UT WOS:000168059900059 ER PT J AU Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Balm, PW Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Bean, A Begel, M Belyaev, A Beri, SB Bernardi, G Bertram, I Besson, A Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Buehler, M Buescher, V Burtovoi, VS Butler, JM Canelli, F Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Cho, DK Choi, S Chopra, S Christenson, JH Chung, M Claes, D Clark, AR Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cummings, MAC Cutts, D Dahl, OI Davis, GA Davis, K De, K Del Signore, K Demarteau, M Demina, R Demine, P Denisov, D Denisov, SP Desai, S Diehl, HT Diesburg, M Di Loreto, G Doulas, S Draper, P Ducros, Y Dudko, LV Duensing, S Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Graham, G Grannis, PD Green, JA Greenlee, H Grinstein, S Groer, L Grudberg, P Grunendahl, S Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Hedin, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hou, S Huang, Y Ito, AS Jerger, SA Jesik, R Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Juste, A Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Kuznetsov, VE Landsberg, G Leflat, A Lehner, F Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lucotte, A Lueking, L Lundstedt, C Maciel, AKA Madaras, RJ Manankov, V Mao, HS Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McMahon, T Melanson, HL Meng, XC Merkin, M Merritt, KW Miao, C Miettinen, H Mihalcea, D Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Moore, RW Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, B Oshima, N Padley, P Pan, LJ Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Peters, O Piegaia, R Piekarz, H Pope, BG Popkov, E Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramberg, E Rapidis, PA Reay, NW Reucroft, S Rha, J Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherford, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Schwarzman, A Sculli, J Sen, N Shabalina, E Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Smak, V Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sorin, V Sosebee, M Sotnikova, N Soustruznik, K Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Taylor, W Tentindo-Repond, S Thompson, J Toback, D Tripathi, SM Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Van Kooten, R Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Wang, H Wang, ZM Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Whiteson, D Wightman, JA Wijngaarden, DA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Z Zanabria, M Zheng, H Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Balm, PW Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Bean, A Begel, M Belyaev, A Beri, SB Bernardi, G Bertram, I Besson, A Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Buehler, M Buescher, V Burtovoi, VS Butler, JM Canelli, F Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Cho, DK Choi, S Chopra, S Christenson, JH Chung, M Claes, D Clark, AR Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cummings, MAC Cutts, D Dahl, OI Davis, GA Davis, K De, K Del Signore, K Demarteau, M Demina, R Demine, P Denisov, D Denisov, SP Desai, S Diehl, HT Diesburg, M Di Loreto, G Doulas, S Draper, P Ducros, Y Dudko, LV Duensing, S Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Graham, G Grannis, PD Green, JA Greenlee, H Grinstein, S Groer, L Grudberg, P Grunendahl, S Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Hedin, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hou, S Huang, Y Ito, AS Jerger, SA Jesik, R Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Juste, A Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Kuznetsov, VE Landsberg, G Leflat, A Lehner, F Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lucotte, A Lueking, L Lundstedt, C Maciel, AKA Madaras, RJ Manankov, V Mao, HS Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McMahon, T Melanson, HL Meng, XC Merkin, M Merritt, KW Miao, C Miettinen, H Mihalcea, D Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Moore, RW Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, B Oshima, N Padley, P Pan, LJ Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Peters, O Piegaia, R Piekarz, H Pope, BG Popkov, E Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramberg, E Rapidis, PA Reay, NW Reucroft, S Rha, J Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherford, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Schwarzman, A Sculli, J Sen, N Shabalina, E Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Smak, V Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sorin, V Sosebee, M Sotnikova, N Soustruznik, K Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Taylor, W Tentindo-Repond, S Thompson, J Toback, D Tripathi, SM Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Van Kooten, R Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Wang, H Wang, ZM Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Whiteson, D Wightman, JA Wijngaarden, DA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Z Zanabria, M Zheng, H Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A TI Measurement of the angular distribution of electrons from W -> e nu decays observed in p(p)over-bar collisions at root s=1.8 TeV SO PHYSICAL REVIEW D LA English DT Article ID W-BOSON MASS; SMALL TRANSVERSE-MOMENTUM; HADRON-COLLISIONS; D0 DETECTOR; ENERGY; QCD; COLLABORATION; COLLIDERS AB We present the first measurement of the electron angular distribution parameter alpha (2) in W-->e nu events produced in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the D empty set detector during the 1994-1995 Fermilab Tevatron run. We compare our results with next-to-leadiog order perturbative QCD, which predicts an angular distribution of (1 +/- alpha (1) cos theta* + alpha (2) cos(2) theta*), whew theta* is the polar angle of the electron in the Collins-Soper frame. In the presence of QCD corrections, the parameters alpha (1) and alpha (2) become functions of p(T)(W), the W boson transverse momentum. This measurement provides a test of next-to-leading order QCD corrections which are a non negligible contribution to the W boson mass measurement. C1 NYU, New York, NY 10003 USA. Univ Buenos Aires, Buenos Aires, DF, Argentina. Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil. Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Los Andes, Bogota, Colombia. Charles Univ Prague, Prague, Czech Republic. Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic. Univ San Francisco Quito, Quito, Ecuador. Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, Grenoble, France. Univ Aix Marseille 2, CPPM, IN2P3, CNRS, Marseille, France. Univ Paris 06, LPNHE, Paris, France. Univ Paris 07, CNRS, IN2P3, Paris, France. CEA, DAPNIA, Serv Phys Particules, Saclay, France. Panjab Univ, Chandigarh 160014, India. Univ Delhi, Delhi 110007, India. Tata Inst Fundamental Res, Mumbai, India. Seoul Natl Univ, Seoul, South Korea. CINVESTAV, Mexico City 14000, DF, Mexico. FOM, Inst NIKHEF, NL-1098 SJ Amsterdam, Netherlands. Univ Amsterdam, NIKHEF, Amsterdam, Netherlands. Univ Nijmegen, NIKHEF, Nijmegen, Netherlands. Inst Nucl Phys, Krakow, Poland. Inst Theoret & Expt Phys, Moscow 117259, Russia. Moscow MV Lomonosov State Univ, Moscow, Russia. Inst High Energy Phys, Protvino, Russia. Univ Lancaster, Lancaster, England. Univ Arizona, Tucson, AZ 85721 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Davis, Davis, CA 95616 USA. Calif State Univ Fresno, Fresno, CA 93740 USA. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Illinois, Chicago, IL 60607 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Indiana Univ, Bloomington, IN 47405 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Iowa State Univ Sci & Technol, Ames, IA 50011 USA. Univ Kansas, Lawrence, KS 66045 USA. Kansas State Univ, Manhattan, KS 66506 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ Maryland, College Pk, MD 20742 USA. Boston Univ, Boston, MA 02215 USA. Northeastern Univ, Boston, MA 02115 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ Nebraska, Lincoln, NE 68588 USA. Columbia Univ, New York, NY 10027 USA. Univ Rochester, Rochester, NY 14627 USA. SUNY Stony Brook, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Langston Univ, Langston, OK 73050 USA. Univ Oklahoma, Norman, OK 73019 USA. Brown Univ, Providence, RI 02912 USA. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. Rice Univ, Houston, TX 77005 USA. Univ Washington, Seattle, WA 98195 USA. RP NYU, New York, NY 10003 USA. RI De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Santoro, Alberto/E-7932-2014; Peters, Michael/B-4973-2009; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Yip, Kin/D-6860-2013; Kuleshov, Sergey/D-9940-2013; Canelli, Florencia/O-9693-2016; Belyaev, Alexander/F-6637-2015; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016 OI De, Kaushik/0000-0002-5647-4489; Dudko, Lev/0000-0002-4462-3192; Yip, Kin/0000-0002-8576-4311; Kuleshov, Sergey/0000-0002-3065-326X; Canelli, Florencia/0000-0001-6361-2117; Belyaev, Alexander/0000-0002-1733-4408; Kim, Sun Kee/0000-0002-0013-0775; Sznajder, Andre/0000-0001-6998-1108 NR 39 TC 19 Z9 19 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 2001 VL 63 IS 7 AR 072001 DI 10.1103/PhysRevD.63.091102 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200005 ER PT J AU Affolder, T Akimoto, H Akopian, A Albrow, MG Amaral, P Amendolia, SR Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bailey, MW Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Bedeschi, F Belforte, S Bell, WH Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bevensee, B Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Blusk, SR Bocci, A Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Brandl, A van den Brink, S Bromberg, C Brozovic, M Bruner, N Buckley-Geer, E Budagov, J Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Calafiura, P Campbell, M Carithers, W Carlson, J Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chan, AW Chang, PS Chang, PT Chapman, J Chen, C Chen, YC Cheng, MT Chertok, M Chiarelli, G Chirikov-Zorin, I Chlachidze, G Chlebana, F Christofek, L Chu, ML Chung, YS Ciobanu, CI Clark, AG Connolly, A Conway, J Cooper, J Cordelli, M Cranshaw, J Cronin-Hennessy, D Cropp, R Culbertson, R Dagenhart, D D'Auria, S DeJongh, F Dell'Agnello, S Dell'Orso, M Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Engels, E Errede, D Errede, S Fan, Q Feild, RG Fernandez, JP Ferretti, C Field, RD Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Fukui, Y Furic, I Galeotti, S Gallinaro, M Gao, T Garcia-Sciveres, M Garfinkel, AF Gatti, P Gay, C Gerdes, DW Giannetti, P Gorelov, I Giromini, P Glagolev, V Gold, M Goldstein, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Green, C Gris, P Groer, L Grosso-Pilcher, C Guenther, M Guillian, G da Costa, JG Haas, RM Haber, C Hafen, E Hahn, SR Hall, C Handa, T Handler, R Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Heiss, A Herndon, M Hoffman, KD Holck, C Hollebeek, R Holloway, L Hughes, R Huston, J Huth, J Ikeda, H Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Jones, M Joshi, U Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kelly, M Kennedy, RD Kephart, R Khazins, D Kikuchi, T Kilminster, B Kim, BJ Kim, DH Kim, HS Kim, MJ Kim, SH Kim, YK Kirby, M Kirk, M Kirsch, L Klimenko, S Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korn, A Korytov, A Kovacs, E Kroll, J Kruse, M Kuhlmann, SE Kurino, K Kuwabara, T Laasanen, AT Lai, N Lami, S Lammel, S Lamoureux, JI Lancaster, M Latino, G LeCompte, T Lee, AM Lee, K Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Loken, J Loreti, M Lucchesi, D Lukens, P Lusin, S Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Mangano, M Mariotti, M Martignon, G Martin, A Matthews, JAJ Mayer, J Mazzanti, P McFarland, KS McIntyre, P McKigney, E Menguzzato, M Menzione, A Mesropian, C Meyer, A Miao, T Miller, R Miller, JS Minato, H Miscetti, S Mishina, M Mitselmakher, G Moggi, N Moore, E Moore, R Morita, Y Mulhearn, M Mukherjee, A Muller, T Munar, A Murat, P Murgia, S Nachtman, J Nahn, S Nakada, H Nakaya, T Nakano, I Nelson, C Nelson, T Neuberger, D Newman-Holmes, C Ngan, CYP Nicolaidi, P Niu, H Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi , R Okusawa, T Olsen, J Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pappas, SP Partos, D Patrick, J Pauletta, G Paulini, M Paus, C Pescara, L Phillips, TJ Piacentino, G Pitts, KT Pompos, A Pondrom, L Pope, G Popovic, M Prokoshin, F Proudfoot, J Ptohos, F Pukhov, O Punzi, G Ragan, K Rakitine, A Reher, D Reichold, A Ribon, A Riegler, W Rimondi, F Ristori, L Riveline, M Robertson, WJ Robinson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossink, R Safonov, A St Denis, R Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Savard, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semenov, A Semeria, F Shah, T Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Signorelli, G Sill, A Sinervo, P Slaughter, AJ Sliwa, K Smith, C Snider, FD Solodsky, A Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Steele, J Stefanini, A Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, T Takano, T Takashima, R Takikawa, K Tamburello, P Tanaka, M Tannenbaum, B Taylor, W Tecchio, M Teng, PK Terashi, K Tether, S Theriot, D Thompson, AS Thurman-Keup, R Tipton, P Tkaczyk, S Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Tseng, J Turini, N Ukegawa, F Vaiciulis, T Valls, J Vejcik, S Velev, G Vidal, R Vilar, R Volobouev, I Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Watanabe, T Waters, D Watts, T Webb, R Wenzel, H Wester, WC Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Winn, D Wolbers, S Wolinski, D Wolinski, J Wolinski, S Worm, S Wu, X Wyss, J Yagil, S Yao, W Yeh, GP Yoh, J Yosef, C Yoshida, T Yu, I Yu, S Yu, Z Zanetti, A Zetti, F Zucchelli, S AF Affolder, T Akimoto, H Akopian, A Albrow, MG Amaral, P Amendolia, SR Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bailey, MW Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Bedeschi, F Belforte, S Bell, WH Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bevensee, B Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Blusk, SR Bocci, A Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Brandl, A van den Brink, S Bromberg, C Brozovic, M Bruner, N Buckley-Geer, E Budagov, J Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Calafiura, P Campbell, M Carithers, W Carlson, J Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chan, AW Chang, PS Chang, PT Chapman, J Chen, C Chen, YC Cheng, MT Chertok, M Chiarelli, G Chirikov-Zorin, I Chlachidze, G Chlebana, F Christofek, L Chu, ML Chung, YS Ciobanu, CI Clark, AG Connolly, A Conway, J Cooper, J Cordelli, M Cranshaw, J Cronin-Hennessy, D Cropp, R Culbertson, R Dagenhart, D D'Auria, S DeJongh, F Dell'Agnello, S Dell'Orso, M Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Engels, E Errede, D Errede, S Fan, Q Feild, RG Fernandez, JP Ferretti, C Field, RD Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Fukui, Y Furic, I Galeotti, S Gallinaro, M Gao, T Garcia-Sciveres, M Garfinkel, AF Gatti, P Gay, C Gerdes, DW Giannetti, P Gorelov, I Giromini, P Glagolev, V Gold, M Goldstein, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Green, C Gris, P Groer, L Grosso-Pilcher, C Guenther, M Guillian, G da Costa, JG Haas, RM Haber, C Hafen, E Hahn, SR Hall, C Handa, T Handler, R Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Heiss, A Herndon, M Hoffman, KD Holck, C Hollebeek, R Holloway, L Hughes, R Huston, J Huth, J Ikeda, H Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Jones, M Joshi, U Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kelly, M Kennedy, RD Kephart, R Khazins, D Kikuchi, T Kilminster, B Kim, BJ Kim, DH Kim, HS Kim, MJ Kim, SH Kim, YK Kirby, M Kirk, M Kirsch, L Klimenko, S Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korn, A Korytov, A Kovacs, E Kroll, J Kruse, M Kuhlmann, SE Kurino, K Kuwabara, T Laasanen, AT Lai, N Lami, S Lammel, S Lamoureux, JI Lancaster, M Latino, G LeCompte, T Lee, AM Lee, K Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Loken, J Loreti, M Lucchesi, D Lukens, P Lusin, S Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Mangano, M Mariotti, M Martignon, G Martin, A Matthews, JAJ Mayer, J Mazzanti, P McFarland, KS McIntyre, P McKigney, E Menguzzato, M Menzione, A Mesropian, C Meyer, A Miao, T Miller, R Miller, JS Minato, H Miscetti, S Mishina, M Mitselmakher, G Moggi, N Moore, E Moore, R Morita, Y Mulhearn, M Mukherjee, A Muller, T Munar, A Murat, P Murgia, S Nachtman, J Nahn, S Nakada, H Nakaya, T Nakano, I Nelson, C Nelson, T Neuberger, D Newman-Holmes, C Ngan, CYP Nicolaidi, P Niu, H Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi , R Okusawa, T Olsen, J Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pappas, SP Partos, D Patrick, J Pauletta, G Paulini, M Paus, C Pescara, L Phillips, TJ Piacentino, G Pitts, KT Pompos, A Pondrom, L Pope, G Popovic, M Prokoshin, F Proudfoot, J Ptohos, F Pukhov, O Punzi, G Ragan, K Rakitine, A Reher, D Reichold, A Ribon, A Riegler, W Rimondi, F Ristori, L Riveline, M Robertson, WJ Robinson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossink, R Safonov, A St Denis, R Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Savard, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semenov, A Semeria, F Shah, T Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Signorelli, G Sill, A Sinervo, P Slaughter, AJ Sliwa, K Smith, C Snider, FD Solodsky, A Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Steele, J Stefanini, A Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, T Takano, T Takashima, R Takikawa, K Tamburello, P Tanaka, M Tannenbaum, B Taylor, W Tecchio, M Teng, PK Terashi, K Tether, S Theriot, D Thompson, AS Thurman-Keup, R Tipton, P Tkaczyk, S Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Tseng, J Turini, N Ukegawa, F Vaiciulis, T Valls, J Vejcik, S Velev, G Vidal, R Vilar, R Volobouev, I Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Watanabe, T Waters, D Watts, T Webb, R Wenzel, H Wester, WC Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Winn, D Wolbers, S Wolinski, D Wolinski, J Wolinski, S Worm, S Wu, X Wyss, J Yagil, S Yao, W Yeh, GP Yoh, J Yosef, C Yoshida, T Yu, I Yu, S Yu, Z Zanetti, A Zetti, F Zucchelli, S TI Tests of enhanced leading order QCD in W boson plus jets events from 1.8 TeV (p)over-barp collisions SO PHYSICAL REVIEW D LA English DT Article ID PRODUCTION CROSS-SECTION; TOP-QUARK PRODUCTION; P(P)OVER-BAR COLLISIONS; ROOT-S=1.8 TEV; COLLIDER DETECTOR; PBARP COLLISIONS; PAIR PRODUCTION; FERMILAB; PHYSICS; SEARCH AB We present a study of events with W bosons and hadronic jets produced in (p) over barp collisions at a center of mass energy of 1.8 TeV. The data consist of 51400 W-->e nu decay candidates from 108 pb(-1) of integrated luminosity collected using the CDF detector at the Fermilab Tevatron collider. Cross sections and jet production properties have been measured for W+greater than or equal to1 to greater than or equal to4 jet events. The data compare well to predictions of leading-order QCD matrix element calculations with added gluon radiation and simulated parton fragmentation. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 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 Los Angeles, Los Angeles, CA 90024 USA. Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain. 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. Univ Florida, Gainesville, FL 32611 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. Kyungpook Natl Univ, Korean Hadron Collider Lab, Taegu 702701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 305, Japan. 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. Univ New Mexico, Albuquerque, NM 87131 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. 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 Udine, 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. RP Affolder, T (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Prokoshin, Fedor/E-2795-2012; Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; St.Denis, Richard/C-8997-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Scodellaro, Luca/K-9091-2014; vilar, rocio/P-8480-2014; Introzzi, Gianluca/K-2497-2015; Gorelov, Igor/J-9010-2015 OI Prokoshin, Fedor/0000-0001-6389-5399; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Scodellaro, Luca/0000-0002-4974-8330; Introzzi, Gianluca/0000-0002-1314-2580; Gorelov, Igor/0000-0001-5570-0133 NR 27 TC 1 Z9 1 U1 1 U2 2 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 APR 1 PY 2001 VL 63 IS 7 AR 072003 PG 29 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200007 ER PT J AU Beacom, JF Boyd, RN Mezzacappa, A AF Beacom, JF Boyd, RN Mezzacappa, A TI Black hole formation in core-collapse supernovae and time-of-flight measurements of the neutrino masses SO PHYSICAL REVIEW D LA English DT Review ID HADRONIC PHASE-TRANSITIONS; TRITIUM BETA-SPECTRUM; X-RAY BINARIES; UPPER LIMIT; GALACTIC SUPERNOVA; STELLAR COLLAPSES; DELAYED COLLAPSE; ANGULAR-DISTRIBUTION; FLAVOR OSCILLATIONS; WEIGHING NEUTRINOS AB In large stars that have exhausted their nuclear fuel, the stellar core collapses to a hot and dense proto-neutron star that cools by the radiation of neutrinos and antineutrinos of all flavors. Depending on its final mass, this may become either a neutron star or a black hole. Black hole formation may be triggered by mass accretion or a change in the high-density equation of state. We consider the possibility that black hole formation happens when the flux of neutrinos is still measurably high. If this occurs, then the neutrino signal from the supernova will be terminated abruptly (the transition takes less than or similar to0.5 ms). The properties and duration of the signal before the cutoff are important measures of both the physics and astrophysics of the cooling proto-neutron star. For the event rates expected in present and proposed detectors, the cutoff will generally appear sharp, thus allowing model-independent time-of-flight mass tests for the neutrinos after the cutoff. If black hole formation occurs relatively early, within a few (similar to1) seconds after core collapse, then the expected luminosities are of order L-BH=10(52) erg/s per flavor. In this case, the neutrino mass sensitivity can be extraordinary. For a supernova at a distance D=10 kpc, SuperKamiokande can detect a <()over bar>(e) mass down to 1.8 eV by comparing the arrival times of the high-energy and low-energy neutrinos in <()over bar>(e)+p-->e(+)+n. This test will also measure the cutoff time, and will thus allow a mass test of nu (mu) and nu (tau) relative to <()over bar>(e). Assuming that nu (mu) and nu (tau) are nearly degenerate, as suggested by the atmospheric neutrino results, masses down to about 6 eV can be probed with a proposed lead detector of mass M-D=4 kton (OMNIS). Remarkably, the neutrino mass sensitivity scales as (D/LBHMD)(1/2). Therefore, direct sensitivity to all three neutrino masses in the interesting few-eV range is realistically possible; there are no other known techniques that have this capability. C1 CALTECH, Phys Dept 161 33, Pasadena, CA 91125 USA. NASA, Fermilab Astrophys Ctr, Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Ohio State Univ, Dept Astron, Columbus, OH 43210 USA. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP CALTECH, Phys Dept 161 33, Pasadena, CA 91125 USA. EM beacom@fnal.gov; boyd@mps.ohio-state.edu; mezz@nova.phy.ornl.gov RI Mezzacappa, Anthony/B-3163-2017; OI Mezzacappa, Anthony/0000-0001-9816-9741; Beacom, John/0000-0002-0005-2631 NR 138 TC 70 Z9 71 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 APR 1 PY 2001 VL 63 IS 7 AR 073011 DI 10.1103/PhysRevD.63.073011 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200018 ER PT J AU Bhattacharya, T Gupta, R Lee, W Sharpe, S AF Bhattacharya, T Gupta, R Lee, W Sharpe, S TI Order alpha improved renormalization constants SO PHYSICAL REVIEW D LA English DT Article ID NONPERTURBATIVE O(A) IMPROVEMENT; IMPROVED LATTICE QCD; ONE-LOOP ORDER; WILSON FERMIONS; PERTURBATION-THEORY; CONTINUUM-LIMIT; WARD IDENTITIES; CHIRAL-SYMMETRY; AXIAL CURRENT; OPERATORS AB We present nonperturbative results for the constants needed for an-shell O(a) improvement of bilinear operators composed of Wilson fermions. We work at beta =6.0 and 6.2 in the quenched approximation. The calculation is done by imposing axial and vector Ward identities on correlators similar to those used in standard hadron mass calculations. A crucial feature of the calculation is the use of nondegenerate quarks. We also obtain results for the constants needed for off-shell O(a) improvement of bilinears, and for the scale- and scheme-independent renormalization constants, Z(A), Z(v), and Z(S)/Z(P). Several of the constants are determined using a variety of different Ward identities, and we compare their relative efficacies. In this way, we find a method for calculating c(V) that gives smaller errors than that used previously. Wherever possible, we compare our results with those of the ALPHA Collaboration (who use the Schrodinger functional and with one-loop tadpole-improved perturbation theory. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Washington, Dept Phys, Seattle, WA 98195 USA. RP Bhattacharya, T (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM tanmoy@lanl.gov; rajan@lanl.gov; vvlee@lanl.gov; sharpe@phys.washington.edu RI Bhattacharya, Tanmoy/J-8956-2013; OI Bhattacharya, Tanmoy/0000-0002-1060-652X; Lee, Weonjong/0000-0002-9040-4134 NR 31 TC 60 Z9 60 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 APR 1 PY 2001 VL 63 IS 7 AR 074505 DI 10.1103/PhysRevD.63.074505 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200047 ER PT J AU Bodwin, GT Harris, BW AF Bodwin, GT Harris, BW TI Compatibility of various approaches to heavy-quark fragmentation SO PHYSICAL REVIEW D LA English DT Article ID D-ASTERISK PRODUCTION; DESY HERA; COLLISIONS; E(+)E(-); ANNIHILATION; CHARM; QCD AB We find that the definition of the heavy-quark fragmentation function given by Jaffe and Randall differs by a factor of the longitudinal-momentum fraction z from the standard Collins-Soper definition. Once this factor is taken into account, the explicit calculation of Braaten et al. is found to be in agreement with the general analysis of Jaffe and Randall. We also examine the model of Peterson et nl. for heavy-quark fragmentation and find that the quoted values of the width and of the value of z at the maximum are in error. The corrected values are in agreement with the analysis of Jaffe and Randall. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. NR 14 TC 2 Z9 2 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 2001 VL 63 IS 7 AR 077503 DI 10.1103/PhysRevD.63.077503 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200075 ER PT J AU Chanowitz, MS AF Chanowitz, MS TI New physics and the Landau pole SO PHYSICAL REVIEW D LA English DT Article ID HIGGS-BOSON MASS; MODEL AB In scalar field theories the Landau pole is an ultraviolet singularity in the running coupling constant that indicates a mass scale at which the theory breaks down and new physics must intervene. However, new physics at the pole will in general affect the running of the low energy coupling constant, which will in turn affect the location of the pole and the related upper limit ("triviality" bound) on the low energy coupling constant. If the new physics is strongly coupled to the scalar fields these effects can be significant even though they are power suppressed We explore the possible range of such effects by deriving the one loop renormalization group equations for an effective scalar field theory with a dimension 6 operator representing the low energy effects of the new physics. As an independent check we also consider a renormalizable model of the high-scale physics constructed so that its low energy limit coincides with the effective theory. C1 Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Chanowitz, MS (reprint author), Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. EM chanowitz@lbl.gov NR 13 TC 2 Z9 2 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 APR 1 PY 2001 VL 63 IS 7 AR 076002 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200062 ER PT J AU Cheng, HY Yang, KC AF Cheng, HY Yang, KC TI B -> J/psi K decays in QCD factorization SO PHYSICAL REVIEW D LA English DT Article ID HADRONIC 2-BODY DECAYS; HEAVY MESON DECAYS AB The hadronic decays B --> J/psiK (K*) are interesting because experimentally they are the only color-suppressed modes which have been measured, and theoretically they are calculable by QCD factorization even when the emitted meson J/psi is heavy. We analyze the decay B --> J/psiK within the framework of QCD factorization. We show explicitly the scale and gamma (5)-scheme independence of decay amplitudes and infrared safety of nonfactorizable corrections at twist-2 order. Leading-twist contributions from the light-cone distribution amplitudes (LCDAs) of the mesons are too small to accommodate the data; the nonfactorizable corrections to naive factorization are small. We study the twist-3 effects due to the kaon and find that the coefficient a(2)(J/psiK) is largely enhanced by the nonfactorizable spectator interactions arising from the twist-3 kaon LCDA phi (K)(sigma), which an formally power suppressed but chirally, logarithmically, and kinematically enhanced. Therefore, factorization breaks down at twist-3 order. The higher-twist effects of J/psi are briefly discussed. Our result also resolves the long-standing sign ambiguity of a(2)(J/psiK), which turns out to be positive for its real part. C1 Acad Sinica, Inst Phys, Taipei 115, Taiwan. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Chung Yuan Christian Univ, Dept Phys, Chungli 320, Taiwan. RP Acad Sinica, Inst Phys, Taipei 115, Taiwan. NR 19 TC 58 Z9 58 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 APR 1 PY 2001 VL 63 IS 7 AR 074011 DI 10.1103/PhysRevD.63.074011 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200033 ER PT J AU Davoudiasl, H Hewett, JL Rizzo, TG AF Davoudiasl, H Hewett, JL Rizzo, TG TI Experimental probes of localized gravity: On and off the wall SO PHYSICAL REVIEW D LA English DT Review ID KALUZA-KLEIN EXCITATIONS; LARGE EXTRA DIMENSIONS; RANDALL-SUNDRUM MODEL; SPACE-TIME DIMENSIONS; BRANE WORLD SCENARIO; STANDARD MODEL; HIERARCHY PROBLEM; SUPERSYMMETRY BREAKING; COSMOLOGICAL EXPANSION; COMPOSITENESS SCALES AB The phenomenology of the Randall-Sundrum model of localized gravity is analyzed in detail for the two scenarios where the standard model (SM) gauge and matter fields are either confined to a TeV scale 3-brane or may propagate in a slice of five dimensional anti-de Sitter space. In the latter instance, we derive the interactions of the graviton, gauger and fermion Kaluza-Klein (KK) states. The resulting phenomenological signatures are shown to be highly dependent on the value of the 5-dimensional fermion mass and differ substantially from the case where the SM fields lie on the TeV-brane. In both scenarios, we examine the collider signatures for direct production of the graviton and gauge KK towers as well as their induced contributions to precision electroweak observables. These direct and indirect signatures are found to play a complementary role in the exploration of the model parameter space. Tn the case where the SM field content resides on the TeV-brane, we show thar the CERN LHC san probe the full parameter space and hence will either discover or exclude this model if the scale of electroweak physics on the 3-brane is less than 10 TeV. We also show that spontaneous electroweak symmetry breaking of the SM must take place on the TeV-brane. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Davoudiasl, H (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 115 TC 274 Z9 274 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 APR 1 PY 2001 VL 63 IS 7 AR 075004 DI 10.1103/PhysRevD.63.075004 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200052 ER PT J AU Dobrescu, BA Landsberg, G Matchev, KT AF Dobrescu, BA Landsberg, G Matchev, KT TI Higgs boson decays to CP-odd scalars at the Fermilab Tevatron and beyond SO PHYSICAL REVIEW D LA English DT Article ID ELECTROWEAK SYMMETRY-BREAKING; SUPERSYMMETRIC STANDARD MODEL; SEARCH; SIGNATURES; COLLIDERS; PHOTONS; PHYSICS; SIGNALS; LIMITS; LIGHT AB In extended Higgs models, the Higgs boson may decay into a pair of light CP-odd scalars, with distinctive collider signatures. We study the ensuing Higgs signals at the upgraded Fermilab Tevatron, considering the subsequent decays of the scalars into pairs of gluons or photons. For CP-odd scalars lighter than a few GeV, the Higgs boson manifests itself as a diphoton resonance and can be discovered up to masses of a few hundred GeV. For heavier CP-odd scalars the reach extends at most up to Mh similar to 120 GeV. We also discuss the capabilities of the CERN LHC and lepton colliders in these channels. C1 Fermi Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. Brown Univ, Dept Phys, Providence, RI 02912 USA. RP Dobrescu, BA (reprint author), Fermi Natl Accelerator Lab, Dept Theoret Phys, POB 500, Batavia, IL 60510 USA. NR 30 TC 107 Z9 107 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 APR 1 PY 2001 VL 63 IS 7 AR 075003 DI 10.1103/PhysRevD.63.075003 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200051 ER PT J AU Grossman, Y Haber, HE AF Grossman, Y Haber, HE TI Basis-independent analysis of the sneutrino sector in R-parity violating supersymmetry SO PHYSICAL REVIEW D LA English DT Article ID SOFTLY BROKEN SUPERSYMMETRY; LEPTON-NUMBER VIOLATION; RIGHT-HANDED NEUTRINO; STANDARD MODEL; RENORMALIZATION-GROUP; FLAVOR VIOLATION; MIXING PHENOMENA; MAGNETIC-MOMENT; CP VIOLATION; MASSES AB In R-parity-violating supersymmetric models (with a conserved baryon number), there are no quantum numbers that distinguish the lepton-doublet and down-type Higgs supermultiplets. As a result, the R-parity-violating parameters depend on the basis choice for these superfields, although physical observables are independent of the choice of basis. This paper presents a basis-independent computation of the sneutrino-antisneutrino squared-mass splitting in terms of basis-independent quantities. Techniques are developed for an arbitrary number of sneutrino generations; specific results are provided for the one, two and three generation cases. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA. RP Grossman, Y (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. NR 64 TC 26 Z9 26 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 APR 1 PY 2001 VL 63 IS 7 AR 075011 DI 10.1103/PhysRevD.63.075011 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200059 ER PT J AU Kharzeev, D Levin, E AF Kharzeev, D Levin, E TI Soft double-diffractive Higgs boson production at hadron colliders SO PHYSICAL REVIEW D LA English DT Article ID DOUBLE-POMERON EXCHANGE; LARGE RAPIDITY GAPS; ENERGY-MOMENTUM-TENSOR; SURVIVAL PROBABILITY; ELASTIC-SCATTERING; QCD; COLLISIONS; ANOMALIES; TRACE; MODEL AB We evaluate the nonperturbative contribution to the double-diffractive production of the Higgs boson, which arises due to the QCD scale anomaly if the mass of the Higgs boson, M-H, is Smaller than the mass of the top quark, M-T, M-H(H)=0.019-0.14 ph at Fermilab Tevatron energies, and sigma (H)=0.01-0.27 ph at the energy of the CERN LHC. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, HEP Dept, IL-69978 Tel Aviv, Israel. Fermi Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. RP Kharzeev, D (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM kharzeeu@bnl.gov; leving@post.tau.ac.il NR 71 TC 18 Z9 18 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 APR 1 PY 2001 VL 63 IS 7 AR 073004 DI 10.1103/PhysRevD.63.073004 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200011 ER PT J AU Kurylov, A McLaughlin, GC Ramsey-Musolf, MJ AF Kurylov, A McLaughlin, GC Ramsey-Musolf, MJ TI Constraints on T-odd, P-even interactions from electric dipole moments, reexamined SO PHYSICAL REVIEW D LA English DT Article ID PARITY NONCONSERVATION; EXPERIMENTAL LIMIT; STANDARD MODEL; NEUTRON; NUCLEAR; VIOLATION; PHYSICS; INVARIANCE; SYMMETRY; SYSTEM AB We construct the relationship between nonrenormalizable, effective, time-reversal violating (TV), parity conserving (PC) interactions of quarks and gauge bosons and Various low-energy TVPC and TV parity-violating (PV) observables. Using effective held theory methods, we delineate the scenarios under which experimental limits on permanent electric dipole moments (EDM's) of the electron, neutron, and neutral atoms as well as limits on TVPC observables provide the most stringent bounds on new TVPC interactions. Under scenarios in which parity invariance is restored at short distances, the one-loop EDM of elementary fermions generate the mast severe constraints. The limits derived from the atomic EDM of Hg-199 are considerably weaker. When parity symmetry remains broken at short distances, direct TVPC starch Limits provide the least ambiguous bounds. The direct limits follow from TVPC interactions between two quarks. C1 Univ Connecticut, Dept Phys, Storrs, CT 06269 USA. SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Thomas Jefferson Natl Accelerator Facil, Theory Grp, Newport News, VA 23606 USA. RP Kurylov, A (reprint author), Univ Connecticut, Dept Phys, Storrs, CT 06269 USA. NR 42 TC 18 Z9 18 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 APR 1 PY 2001 VL 63 IS 7 AR 076007 DI 10.1103/PhysRevD.63.076007 PG 19 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200067 ER PT J AU Royon, C Schoeffel, L Bartels, J Jung, H Peschanskis, R AF Royon, C Schoeffel, L Bartels, J Jung, H Peschanskis, R TI QCD analysis of the diffractive structure function F-2(D)(3) SO PHYSICAL REVIEW D LA English DT Article ID DEEP-INELASTIC SCATTERING; DIPOLE PICTURE; BFKL POMERON; HERA; SINGULARITY; DYNAMICS AB The proton diffractive structure function F-2(D(3)) measured in the H1 and ZEUS experiments at DESY HERA is analyzed in terms of both Regge phenomenology and perturbative QCD evolution. A new method determines the values of the Regge intercepts in "hard" diffraction, confirming a higher value of the Pomeron intercept than for soft physics. The data are well described by a QCD analysis in which pointlike parton distributions, evolving according to the DGLAP equations, are assigned to the leading and subleading Regge exchanges. The gluon distributions are found to be quite different for H1 and ZEUS. A global fit analysis, where a higher twist component is taken from models, allows us to use data in the whole available range in diffractive mass and gives a stable answer for the leading twist contribution. We give sets of quark and gluon parton distributions for the Pomeron, and predictions for the charm and the longitudinal proton diffractive structure function from the QCD fit. An extrapolation to the Fermilab Tevatron range is compared with CDF data on single diffraction. Conclusions on factorization breaking depend critically on whether H1 (strong violation) or ZEUS (compatibility at low beta) fits are taken into account. C1 Ctr Etud Saclay, Serv Phys Particules, F-91191 Gif Sur Yvette, France. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Texas, Arlington, TX 76019 USA. Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany. Univ Lund, S-22362 Lund, Sweden. Ctr Etud Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. RP Royon, C (reprint author), Ctr Etud Saclay, Serv Phys Particules, F-91191 Gif Sur Yvette, France. NR 44 TC 27 Z9 27 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 APR 1 PY 2001 VL 63 IS 7 AR 074004 DI 10.1103/PhysRevD.63.074004 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 416QT UT WOS:000167792200026 ER PT J AU Bastea, S Puri, S Lebowitz, JL AF Bastea, S Puri, S Lebowitz, JL TI Surface-directed spinodal decomposition in binary fluid mixtures SO PHYSICAL REVIEW E LA English DT Article ID FAST-MODE KINETICS; PHASE-SEPARATION; MOLECULAR-DYNAMICS; DOMAIN GROWTH; INTERPLAY; SIMULATIONS; CAPILLARY; GEOMETRY; FILMS; WALL AB We consider the phase separation of binary fluids in contact with a surface, which is preferentially wetted by one of the components of the mixture. We review the results available fur this problem and present numerical results obtained using a mesoscopic level simulation technique for the three-dimensional problem. C1 Rutgers State Univ, Dept Math & Phys, New Brunswick, NJ 08903 USA. Jawaharlal Nehru Univ, Sch Phys Sci, New Delhi 110067, India. RP Bastea, S (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. EM bastea2@llnl.gov NR 46 TC 30 Z9 30 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD APR PY 2001 VL 63 IS 4 AR 041513 DI 10.1103/PhysRevE.63.041513 PN 1 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 424CQ UT WOS:000168214900044 PM 11308854 ER PT J AU Edwards, BF Smith, DH AF Edwards, BF Smith, DH TI Critical wavelength for river meandering SO PHYSICAL REVIEW E LA English DT Article ID SIMULATION-MODEL; BEND THEORY; DYNAMICS AB A fully nonlinear modal analysis identifies a critical centerline wave number q(c) for river meandering that separates long-wavelength bends, which grow to cutoff, from short-wavelength bends, which decay. Exact, numerical, and approximate analytical results for q(c) rely on the lkeda, Parker, and Sawai [J. Fluid Mech. 112, 363 (1981)] model, supplemented by dynamical equations that govern the river migration and length. Predications also include upvalley bend migration at long times and a peak in lateral migration rates at intermediate times. Experimental tests are suggested. C1 US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA. W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA. RP Edwards, BF (reprint author), US DOE, Natl Energy Technol Lab, 3610 Collins Ferry Rd, Morgantown, WV 26507 USA. NR 23 TC 1 Z9 1 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD APR PY 2001 VL 63 IS 4 AR 045304 PN 2 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 424CT UT WOS:000168215100009 ER PT J AU Kink, I Laming, JM Takacs, E Porto, JV Gillaspy, JD Silver, E Schnopper, H Bandler, SR Barbera, M Brickhouse, N Murray, S Madden, N Landis, D Beeman, J Haller, EE AF Kink, I Laming, JM Takacs, E Porto, JV Gillaspy, JD Silver, E Schnopper, H Bandler, SR Barbera, M Brickhouse, N Murray, S Madden, N Landis, D Beeman, J Haller, EE TI Analysis of broadband x-ray spectra of highly charged krypton from a microcalorimeter detector of an electron-beam ion trap SO PHYSICAL REVIEW E LA English DT Article ID FE-XVII; NE-LIKE; PLASMAS; ATOMS; KR; COEFFICIENTS; ULTRAVIOLET; DENSITY; REGION; LINES AB Spectra of highly charged Kr ions, produced in an electron-beam ion trap (EBIT), have been recorded in a broad x-ray energy band (0.3 keV to 4 keV) with a microcalorimeter detector. Most of the spectral lines have been identified as transitions of B- to Al-like Kr. The transition energies have been determined with 0.2% uncertainty. A semi-empirical EBIT plasma model has been created to calculate a synthetic spectrum of highly charged Kr and to determine a charge state distribution of Kr ions inside the EBIT. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. USN, Res Lab, Washington, DC 20375 USA. MIT, Cambridge, MA 02139 USA. Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA. Osservatorio Astron GS Vaiana, Palermo, Italy. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kink, I (reprint author), Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. RI Bandler, Simon/A-6258-2010; OI Bandler, Simon/0000-0002-5112-8106; Brickhouse, Nancy/0000-0002-8704-4473 NR 48 TC 11 Z9 12 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD APR PY 2001 VL 63 IS 4 AR 046409 DI 10.1103/PhysRevE.63.046409 PN 2 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 424CT UT WOS:000168215100065 PM 11308958 ER PT J AU Schulz, JC Warr, GG Butler, PD Hamilton, WA AF Schulz, JC Warr, GG Butler, PD Hamilton, WA TI Adsorbed layer structure of cationic surfactants on quartz SO PHYSICAL REVIEW E LA English DT Article ID SOLID-LIQUID INTERFACES; NEUTRON REFLECTION; HEXADECYLTRIMETHYLAMMONIUM BROMIDE; AQUEOUS-SOLUTION; PHASE-BEHAVIOR; ADSORPTION; MICELLES; SILICA; MICA; MECHANISM AB Recent atomic force microscopy (AFM) surface images of surfactant adsorbed at solid and solution interfaces have shown apparent micellar aggregates familiar from bulk self-assembly. This contradicts the classical picture of laterally unstructured bilayers within which neutron reflectometry (NR) measurements have previously been analyzed. Applying both techniques to surfactant adsorption on quartz, we show that film thickness and coverage parameters derived from NR results are generally consistent with those from AFM and bulk self-assembly. NR by itself allows us to distinguish between actual bilayer and probable aggregate adsorption, which will be of particular importance when a solution's rheology makes AFM imaging impractical. C1 Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia. Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Warr, GG (reprint author), Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia. EM g.warr@chem.usyd.edu.au RI Schulz, Jamie/B-3819-2008; Butler, Paul/D-7368-2011 NR 33 TC 7 Z9 7 U1 0 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD APR PY 2001 VL 63 IS 4 AR 041604 PN 1 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 424CQ UT WOS:000168214900049 ER PT J AU Blaskiewicz, M AF Blaskiewicz, M TI Transverse stability with nonlinear space charge SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB Transverse stability with nonlinear space charge is studied within the context of coasting beams. For bare tune spreads originating from chromaticity or frequency slip, the space charge tune spread has a fairly small effect and the incoherent space charge force is well modeled by a transverse capacitance. For tune spreads due to octupoles or fringe fields, beams are more stable when the bare tune increases with betatron amplitude. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. NR 14 TC 9 Z9 9 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 APR PY 2001 VL 4 IS 4 AR 044202 DI 10.1103/PhysRevSTAB.4.044202 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 433EP UT WOS:000168745300009 ER PT J AU Fischer, W Jain, A Tepikian, S AF Fischer, W Jain, A Tepikian, S TI Beam-based measurements of persistent current decay in the Relativistic Heavy Ion Collider SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB The two rings of the Relativistic Heavy Ion Collider are equipped with superconducting dipole magnets. At injection, induced persistent currents in these magnets lead to a sextupole component. As the persistent currents decay with time, the horizontal and vertical chromaticities change. From magnet measurements of persistent current decays, chromaticity changes in the machine are estimated and compared with chromaticity measurements. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fischer, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 23 TC 3 Z9 3 U1 0 U2 0 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 APR PY 2001 VL 4 IS 4 AR 041002 DI 10.1103/PhysRevSTAB.4.041002 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 433EP UT WOS:000168745300004 ER PT J AU Heifets, S AF Heifets, S TI Saturation of the coherent beam-beam instability SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB The nonlinear regime of the beam-beam instability for flat beams is considered. Excitation of coherent modes and mode interaction is studied above the threshold of instability. It is shown that the exponential growth of the linear approximation may saturate, leading to a finite growth of transverse emittance. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Heifets, S (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 10 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 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD APR PY 2001 VL 4 IS 4 AR 044401 DI 10.1103/PhysRevSTAB.4.044401 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 433EP UT WOS:000168745300010 ER PT J AU Lewellen, JW AF Lewellen, JW TI Higher-order mode rf guns SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB Traditional photocathode rf gun design is based around the use of TM0,1,0-mode cavities. This is typically done in the interest of obtaining the highest possible gradient per unit supplied rf power and for historical reasons. In a multicell, aperture-coupled photoinjector, however, the gun as a whole is produced from strongly coupled cavities oscillating in a pi mode. This design requires very careful preparation and tuning, as the field balance and resonant frequencies are easily disturbed. Side-coupled designs are often avoided because of the dipole modes introduced into the cavity fields. This paper proposes the use of a single higher-order mode rf cavity in order to generate the desired on-axis fields. It is shown that the field experienced by a beam in a higher-order mode rf gun is initially very similar to traditional 1.5- or 2.5-cell pi -mode gun fields, and projected performance in terms of beam quality is also comparable. The new design has the advantages of much greater ease of fabrication, immunity from coupled-cell effects, and simpler tuning procedures. Because of the gun geometry, the possibility also exists for improved temperature stabilization and cooling for high duty-cycle applications. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lewellen, JW (reprint author), Argonne Natl Lab, Adv Photon Source, 401-B2207, Argonne, IL 60439 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 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 APR PY 2001 VL 4 IS 4 AR 040101 DI 10.1103/PhysRevSTAB.4.040101 PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 433EP UT WOS:000168745300001 ER PT J AU Lidia, SM AF Lidia, SM TI Beam dynamics studies for the relativistic klystron two-beam accelerator experiment SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article ID 2-BEAM ACCELERATOR; INTEGRATION; FEL AB Two-beam accelerators (TBAs) have been proposed as efficient power sources for next generation high-energy linear colliders. Studies have demonstrated the possibility of building TBAs from X-band (similar to8-12 GHz) through Ka-band (similar to 30-35 GHz) frequency regions. The relativistic klystron two-beam accelerator project, whose aim is to study TBAs based upon extended relativistic klystrons, is described, and a new simulation code is used to design the latter portions of the experiment. Detailed, self-consistent calculations of the beam dynamics and of the rf cavity output are presented and discussed together with a beam line design that will generate nearly 1.2 GW of power from 40 rf cavities over a 10 m distance. The simulations show that beam current losses are acceptable and that longitudinal and transverse focusing techniques are sufficiently capable of maintaining a high degree of beam quality along the entire beam line. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lidia, SM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 48 TC 1 Z9 1 U1 0 U2 0 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 APR PY 2001 VL 4 IS 4 AR 041001 DI 10.1103/PhysRevSTAB.4.041001 PG 25 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 433EP UT WOS:000168745300003 ER PT J AU Monroe, J Spentzouris, P Balbekov, V Lebrun, P Penn, G Kim, C Kim, ES Kaplan, DM AF Monroe, J Spentzouris, P Balbekov, V Lebrun, P Penn, G Kim, C Kim, ES Kaplan, DM TI Design and simulation of muon ionization cooling channels for the Fermilab Neutrino Factory feasibility study SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB In the past few years, the concept of a high intensity muon storage ring has been pursued as an option for the next generation neutrino source. To produce the high intensity muon beam needed for the successful operation of a neutrino source, on the order of 10(20) muon decays per year, the phase space occupied by the muon beam must be significantly reduced before the beam is accelerated. The initial transverse emittance of the muon beam before acceleration is assumed to be 9 pi mm rad. Because of the time limitation imposed by the muon lifetime, the technique employed to accomplish the desired emittance reduction is ionization cooling. In this paper we present two ionization cooling lattice designs, which use solenoidal focusing elements and liquid hydrogen absorbers to reduce the muon beam phase space. We discuss the design concepts and engineering constraints for these lattices and present simulation results obtained using a detailed tracing code with a complete model of muon-matter interactions. The reduction in transverse emittance is approximately a factor of 5. This result is within a factor of 2 of the total cooling requirements for a successful neutrino factory design and within a factor of 1.4 of the requirements for the main cooling section specified in the conceptual design of this machine. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Lawrence Berkeley Lab, Berkeley, CA 94707 USA. IIT, Chicago, IL 60621 USA. RP Monroe, J (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 23 TC 0 Z9 0 U1 0 U2 0 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 APR PY 2001 VL 4 IS 4 AR 041301 DI 10.1103/PhysRevSTAB.4.041301 PG 12 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 433EP UT WOS:000168745300005 ER PT J AU Ermer, JJ Mosher, JC Baillet, S Leahy, RM AF Ermer, JJ Mosher, JC Baillet, S Leahy, RM TI Rapidly recomputable EEG forward models for realistic head shapes SO PHYSICS IN MEDICINE AND BIOLOGY LA English DT Article ID MEG; LOCALIZATION; POTENTIALS; COMPUTE; SKULL AB With the increasing availability of surface extraction techniques for magnetic resonance and x-ray computed tomography images, realistic head models can be readily generated as forward models in the analysis of electroencephalography (EEG) and magnetoencephalography (MEG) data. Inverse analysis of this data, however, requires that the forward model be computationally efficient. We propose two methods for approximating the EEG forward model using realistic head shapes. The 'sensor-fitted sphere' approach fits a multilayer sphere individually to each sensor, and the 'three-dimensional interpolation' scheme interpolates using a grid on which a numerical boundary element method (BEM) solution has been precomputed. We have characterized the performance of each method in terms of magnitude and subspace error metrics, as well as computational and memory requirements. We have also made direct performance comparisons with traditional spherical models. The approximation provided by the interpolative scheme had an accuracy nearly identical to full BEM, even within 3 mm of the inner skull surface. Forward model computation during inverse procedures was approximately 30 times faster than for a traditional three-shell spherical model. Cast in this framework, high-fidelity numerical solutions currently viewed as computationally prohibitive for solving the inverse problem (e.g. linear Galerkin BEM) can be rapidly recomputed in a highly efficient manner. The sensor-fitting method has a similar one-time cost to the BEM method, and while it produces some improvement over a standard three-shell sphere, its performance does not approach that of the interpolation method. In both methods, there is a one-time cost associated with precomputing the forward solution over a set of grid points. C1 Univ So Calif, Inst Signal & Image Proc, Los Angeles, CA 90089 USA. Raytheon Syst Co, El Segundo, CA 90245 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Hop La Pitie Salpetriere, LENA, CNRS, UPR 640, Paris, France. RP Leahy, RM (reprint author), Univ So Calif, Inst Signal & Image Proc, Los Angeles, CA 90089 USA. NR 20 TC 51 Z9 53 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0031-9155 J9 PHYS MED BIOL JI Phys. Med. Biol. PD APR PY 2001 VL 46 IS 4 BP 1265 EP 1281 DI 10.1088/0031-9155/46/4/324 PG 17 WC Engineering, Biomedical; Radiology, Nuclear Medicine & Medical Imaging SC Engineering; Radiology, Nuclear Medicine & Medical Imaging GA 424AV UT WOS:000168210700025 PM 11324964 ER PT J AU Hadjiconstantinou, NG Garcia, AL AF Hadjiconstantinou, NG Garcia, AL TI Molecular simulations of sound wave propagation in simple gases SO PHYSICS OF FLUIDS LA English DT Article ID MONTE-CARLO METHOD; ERROR AB Molecular simulations of sound waves propagating in a dilute hard sphere gas have been performed using the direct simulation Monte Carlo method. A wide range of frequencies is investigated, including very high frequencies for which the period is much shorter than the mean collision time. The simulation results are compared to experimental data and approximate solutions of the Boltzmann equation. It is shown that free molecular flow is important at distances smaller than one mean free path from the excitation point. (C) 2001 American Institute of Physics. C1 MIT, Dept Mech Engn, Cambridge, MA 02139 USA. Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA. San Jose State Univ, Dept Phys, San Jose, CA 95192 USA. RP Hadjiconstantinou, NG (reprint author), MIT, Dept Mech Engn, Cambridge, MA 02139 USA. NR 28 TC 35 Z9 35 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD APR PY 2001 VL 13 IS 4 BP 1040 EP 1046 DI 10.1063/1.1352630 PG 7 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 411KN UT WOS:000167499400021 ER PT J AU Calvert, W Davidson, RC AF Calvert, W Davidson, RC TI Special topics section: Auroral morphology as constraints on substorm modeling - Foreword SO PHYSICS OF PLASMAS LA English DT Editorial Material C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. NR 3 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 2001 VL 8 IS 4 BP 1098 EP 1098 PG 1 WC Physics, Fluids & Plasmas SC Physics GA 413LF UT WOS:000167613100002 ER PT J AU Held, ED Callen, JD Hegna, CC Sovinec, CR AF Held, ED Callen, JD Hegna, CC Sovinec, CR TI Conductive electron heat flow along magnetic field lines SO PHYSICS OF PLASMAS LA English DT Article ID TRANSPORT; PLASMA; MODELS AB In this work, a unified closure for the conductive electron heat flux along magnetic field lines is derived and examined. Both free-streaming and collisional pitch-angle scattering of electrons are present in the drift kinetic equation which is solved using an expansion in pitch-angle eigenfunctions (Legendre polynomials). The closure takes the form of a generic integral operator involving the electron temperature variation along a magnetic field line and the electron speed. Derived for arbitrary collisionality, the heat flux closure may be written in forms resembling previous collisional and collisionless expressions. Electrons with two to three times the thermal speed are shown to carry heat for all collisionalities and thermal electrons make an important contribution to the heat flow in regimes of moderate to low collisionality. As a practical application, the flow of electron heat along a chaotic magnetic field is calculated in order to highlight the nonlocal nature of the closure which allows for heat to flow against local temperature gradients. (C) 2001 American Institute of Physics. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA. RP Held, ED (reprint author), Utah State Univ, Dept Phys, Logan, UT 84322 USA. NR 20 TC 35 Z9 35 U1 2 U2 9 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 2001 VL 8 IS 4 BP 1171 EP 1179 DI 10.1063/1.1349876 PG 9 WC Physics, Fluids & Plasmas SC Physics GA 413LF UT WOS:000167613100012 ER PT J AU Belova, EV Jardin, SC Ji, H Yamada, M Kulsrud, R AF Belova, EV Jardin, SC Ji, H Yamada, M Kulsrud, R TI Numerical study of global stability of oblate field-reversed configurations SO PHYSICS OF PLASMAS LA English DT Article ID INTERCHANGE STABILITY; TILT STABILITY; PLASMA; MODE; INSTABILITY; EQUILIBRIA; SIMULATION; SPHEROMAK; RINGS AB Global stability of the oblate (small elongation, E <1) Field-Reversed Configuration (FRC) has been investigated numerically using both three-dimensional magnetohydrodynamic (MHD) and hybrid (fluid electrons and kinetic ions) simulations. For every nonzero value of the toroidal mode number n, there are three MHD modes that must be stabilized. For n=1, these are the interchange, the tilt and the radial shift; while for n >1 these are the interchange and two co-interchange modes with different polarization. It is shown that the n=1 tilt mode becomes an external mode when E <1, and it can be effectively stabilized by close-fitting conducting shells, even in the small Larmor radii (MHD) regime. The tilt mode stability improves with increasing oblateness, however at sufficiently small elongations the radial shift mode becomes more unstable than the tilt mode. The interchange mode stability is strongly profile dependent, and all n greater than or equal to1 interchange modes can be stabilized for a class of pressure profile with separatrix beta larger than 0.035. Our results show that all three n=1 modes can be stabilized in the MHD regime, but the stabilization of the n >1 co-interchange modes still remains an open question. (C) 2001 American Institute of Physics. C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Belova, EV (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. RI Jardin, Stephen/E-9392-2010; Yamada, Masaaki/D-7824-2015 OI Yamada, Masaaki/0000-0003-4996-1649 NR 32 TC 26 Z9 26 U1 1 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 2001 VL 8 IS 4 BP 1267 EP 1277 DI 10.1063/1.1355027 PG 11 WC Physics, Fluids & Plasmas SC Physics GA 413LF UT WOS:000167613100024 ER PT J AU Choueiri, EY AF Choueiri, EY TI Plasma oscillations in Hall thrusters SO PHYSICS OF PLASMAS LA English DT Article ID ELECTRIC PROPULSION; DRIFT AB The nature of oscillations in the 1 kHz-60 MHz frequency range that have been observed during operation of Hall thrusters is quantitatively discussed. Contours of various plasma parameters measured inside the accelerating channel of a typical Hall thruster are used to evaluate the various stability criteria and dispersion relations of oscillations that are suspected to occur. A band by band up-to-date overview of the oscillations is carried out with a description of their observed behavior and a discussion of their nature and dependencies through comparison of the calculated contours to reported observations. The discussion encompasses the excitation of low frequency azimuthal drift waves that can form a rotating spoke, axially propagating "transit-time" oscillations, azimuthal drift waves, ionization instability-type waves, and wave emission peculiar to weakly ionized inhomogeneous plasmas in crossed electric and magnetic fields. (C) 2001 American Institute of Physics. C1 Princeton Univ, Elect Propuls & Plasma Dynam Lab, Princeton, NJ 08540 USA. RP Choueiri, EY (reprint author), Princeton Univ, Elect Propuls & Plasma Dynam Lab, Princeton, NJ 08540 USA. NR 39 TC 160 Z9 161 U1 5 U2 34 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 2001 VL 8 IS 4 BP 1411 EP 1426 DI 10.1063/1.1354644 PG 16 WC Physics, Fluids & Plasmas SC Physics GA 413LF UT WOS:000167613100039 ER PT J AU Amendt, P AF Amendt, P TI Pseudomoment fluid modeling: Electron Landau damping of ion-acoustic waves SO PHYSICS OF PLASMAS LA English DT Article ID EXTENDED STELLAR HYDRODYNAMICS; GALACTIC DISKS; PLASMA AB This Brief Communication introduces a hierarchy of electron pseudomoment fluid equations to derive electron Landau damping of ion-acoustic waves. Exact agreement with kinetic predictions is obtained. The pseudomoment fluid formulation allows simple, analytic estimates of Landau damping for general, nonthermal electron distribution functions in Vlasov plasmas. Successful truncation of the pseudomoment hierarchy suggests a novel definition of electron temperature away from thermal equilibrium in the low-frequency regime. (C) 2001 American Institute of Physics. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94501 USA. RP Amendt, P (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94501 USA. NR 14 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 2001 VL 8 IS 4 BP 1437 EP 1440 DI 10.1063/1.1355681 PG 4 WC Physics, Fluids & Plasmas SC Physics GA 413LF UT WOS:000167613100042 ER PT J AU Holzrichter, JF AF Holzrichter, JF TI Attracting and retaining R&D talent for defense SO PHYSICS TODAY LA English DT Article C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Holzrichter, JF (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 3 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD APR PY 2001 VL 54 IS 4 SI SI BP 56 EP 61 DI 10.1063/1.1372115 PG 6 WC Physics, Multidisciplinary SC Physics GA 417QA UT WOS:000167844600020 ER PT J AU Perelson, AS Goldstein, B AF Perelson, AS Goldstein, B TI George Irving Bell - Obituary SO PHYSICS TODAY LA English DT Biographical-Item C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Perelson, AS (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD APR PY 2001 VL 54 IS 4 SI SI BP 85 EP 86 DI 10.1063/1.1372123 PG 2 WC Physics, Multidisciplinary SC Physics GA 417QA UT WOS:000167844600022 ER PT J AU Winich, H Brown, K Goldberg, D AF Winich, H Brown, K Goldberg, D TI Klaus Halbach - Obituary SO PHYSICS TODAY LA English DT Biographical-Item C1 SLAC, Stanford, CA USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Winich, H (reprint author), SLAC, Stanford, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD APR PY 2001 VL 54 IS 4 SI SI BP 89 EP 90 DI 10.1063/1.1372126 PG 2 WC Physics, Multidisciplinary SC Physics GA 417QA UT WOS:000167844600025 ER PT J AU Clark, R AF Clark, R TI Telling left from right in the nucleus SO PHYSICS WORLD LA English DT Article C1 Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA USA. RP Clark, R (reprint author), Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 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 0953-8585 J9 PHYS WORLD JI Phys. World PD APR PY 2001 VL 14 IS 4 BP 24 EP 24 PG 1 WC Physics, Multidisciplinary SC Physics GA 418TJ UT WOS:000167907200021 ER PT J AU Du, Q Kende, H AF Du, Q Kende, H TI Expression of two HOOKLESS genes in peas (Pisum sativum L.) SO PLANT AND CELL PHYSIOLOGY LA English DT Article DE apical hook; auxin (IAA); ethylene; HOOKLESS gene; pea (Pisum sativum L.) ID N-ACETYLTRANSFERASE; CELL ELONGATION; ETHYLENE; ARABIDOPSIS; RNA AB The apical hook of dark-grown dicotyledonous plants results from asymmetric growth of its inner and outer sides, It is a protective structure that prevents damage to the shoot apical meristem and the young leaves as the seedling pushes through the soil, Two phytohormones, ethylene and auxin, are thought to be involved in regulating apical hook formation. HOOKLESS1 (HLS1) of Arabidopsis was recognized as an ethylene-response gene whose product is required for hook formation, We cloned two cDNAs from peas, Ps-HLS1 and Ps-HLS2, whose products are functional homologs of HLS1. Both Ps-HLS1 and Ps-HLS2 complement the hls1 mutation in Arabidopsis, Expression of Ps-HLS1 is enhanced by ethylene and by IAA. Because the effect of ethylene is counteracted by 2,5-norbornadiene, an inhibitor of ethylene action, it appears that the primary factor in apical hook formation in peas is ethylene. C1 Michigan State Univ, DOE Plant Res Lab, E Lansing, MI 48824 USA. Michigan State Univ, Dept Bot & Plant Pathol, E Lansing, MI 48824 USA. RP Kende, H (reprint author), Michigan State Univ, DOE Plant Res Lab, E Lansing, MI 48824 USA. NR 18 TC 5 Z9 5 U1 0 U2 5 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0032-0781 J9 PLANT CELL PHYSIOL JI Plant Cell Physiol. PD APR PY 2001 VL 42 IS 4 BP 374 EP 378 DI 10.1093/pcp/pce044 PG 5 WC Plant Sciences; Cell Biology SC Plant Sciences; Cell Biology GA 424AM UT WOS:000168210000004 PM 11333307 ER PT J AU Heidbrink, WW Beitzel, T Burrell, KH Colchin, R Guldi, CW Kurki-Suonio, T AF Heidbrink, WW Beitzel, T Burrell, KH Colchin, R Guldi, CW Kurki-Suonio, T TI The effect of electric fields and pitch-angle scattering on the radial neutral flux SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID RIPPLE-TRAPPED IONS; HIGH CONFINEMENT MODE; L-H TRANSITION; DIII-D; PARTICLE ANALYZERS; ABRUPT CHANGES; TOKAMAKS; EDGE; TURBULENCE; TRANSPORT AB The radial flux of 10 keV neutrals from the Asdex-Upgrade tokamak has been interpreted as a diagnostic of the radial electric field E-r near the plasma edge (Herrmann W and Asdex-Upgrade Team 1995 Phys. Rev. Lett. 75 4401), with the conclusion that E-r changes gradually at a transition from the L-mode confinement regime to the H-mode regime. In contrast to the Asdex-Upgrade results, a similar installation on the DIII-D tokamak finds no measurable signal in H-mode plasmas with deep E-r wells. Measurable signals only occur in plasmas with relatively large pitch-angle scattering rates at the plasma edge (or with anomalous beam-ion confinement). Large scattering rates require a large electron temperature and are invariably accompanied by deep ripple wells. The results suggest an alternative explanation for the gradual evolution of the neutral-particle signal from Asdex-Upgrade: as the H-mode pedestal develops, more beam ions are pitch-angle scattered into the phase space measured by the detector. C1 Univ Calif Irvine, Irvine, CA 92697 USA. Gen Atom Co, San Diego, CA 92186 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Helsinki Univ Technol, Helsinki, Finland. RP Heidbrink, WW (reprint author), Univ Calif Irvine, Irvine, CA 92697 USA. NR 38 TC 3 Z9 3 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD APR PY 2001 VL 43 IS 4 BP 373 EP 387 DI 10.1088/0741-3335/43/4/301 PG 15 WC Physics, Fluids & Plasmas SC Physics GA 429CK UT WOS:000168498300003 ER PT J AU Adams, DP Vasile, MJ Benavides, G Campbell, AN AF Adams, DP Vasile, MJ Benavides, G Campbell, AN TI Micromilling of metal alloys with focused ion beam-fabricated tools SO PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY LA English DT Article DE micromilling; microtools; ultra-precision machining ID MICROFABRICATION AB This work combines focused ion beam sputtering and ultra-precision machining as a first step in fabricating metal alloy microcomponents. Micro-end mills having similar to 25 mum diameters are made by sputtering cobalt M42 high-speed steel and C2 micrograin tungsten carbide tool blanks. A 20 keV focused gallium ion beam is used to define a number of cutting edges and tool end clearance. Cutting edge radii of curvature are less than or equal to 0.1 mum. Micro-end mill tools having 2, 4 and 5 cutting edges successfully machine millimeter long trenches in 6061-T4 aluminum, brass, 4340 steel and polymethyl methacrylate. Machined trench widths are approximately equal to the tool diameters, and surface roughnesses (R-a) at the bottom of micromachined features are similar to 200 nm. Microtools are robust and operate for more than 6 h without fracture. Results from ultra-precision machining aluminum alloy at feed rates as high as 50 mm/minute and an axial depth of 1.0 mum are included. (C) 2001 Elsevier Science Inc. All rights reserved. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Louisiana Tech Univ, Inst Micromfg, Ruston, LA 71272 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM dpadams@sandia.gov NR 18 TC 60 Z9 67 U1 0 U2 16 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0141-6359 EI 1873-2372 J9 PRECIS ENG JI Precis. Eng.-J. Int. Soc. Precis. Eng. Nanotechnol. PD APR PY 2001 VL 25 IS 2 BP 107 EP 113 DI 10.1016/S0141-6359(00)00064-7 PG 7 WC Engineering, Multidisciplinary; Engineering, Manufacturing; Nanoscience & Nanotechnology; Instruments & Instrumentation SC Engineering; Science & Technology - Other Topics; Instruments & Instrumentation GA 417CE UT WOS:000167817200004 ER PT J AU Hale, LC Slocum, AH AF Hale, LC Slocum, AH TI Optimal design techniques for kinematic couplings SO PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY LA English DT Article DE kinematic coupling; optimization; computer-aided design; friction; repeatability; stiffness matrix; transformation matrix; touch-trigger probe; National Ignition Facility; NIF AB Kinematic couplings are well known to the precision engineering community as simple devices that provide rigid, repeatable connection between two objects through usually six local contact areas. They serve many applications that require 1) separation and repeatable engagement, and/or 2) minimum influence that an imprecise or unstable foundation has on the stability of a precision component. Typically, thf coupling design process starts by arranging or adapting one of two classic configurations, the three-vee coupling or the tetrahedronvee-flat coupling, to suit the geometry of the application. It is often sufficient to analyze only the contact stresses and perhaps the coupling stiffness when the configuration remains fairly conventional (i.e., planar) and the application is not particularly demanding. Otherwise, effort spent optimizing. the configuration through additional analysis and/or testing is well worthwhile. This paper proposes several optimization criteria and presents analysis techniques for optimizing kinematic coupling designs. The general modeling approach uses [6 X 6] transformation matrices Co reflect contact stiffness matrices to a common coordinate system where they are added together as a parallel combination, for example. This method has wider applications particularly for flexure systems, which will be the subject of a future article. in addition, the reader may find the kinematic coupling designs presented in this paper useful for future applications. (C) 2001 Elsevier Science Inc. All rights reserved. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. MIT, Dept Mech Engn, Cambridge, MA 02139 USA. RP Hale, LC (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 17 TC 26 Z9 28 U1 3 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0141-6359 J9 PRECIS ENG JI Precis. Eng.-J. Int. Soc. Precis. Eng. Nanotechnol. PD APR PY 2001 VL 25 IS 2 BP 114 EP 127 DI 10.1016/S0141-6359(00)00066-0 PG 14 WC Engineering, Multidisciplinary; Engineering, Manufacturing; Nanoscience & Nanotechnology; Instruments & Instrumentation SC Engineering; Science & Technology - Other Topics; Instruments & Instrumentation GA 417CE UT WOS:000167817200005 ER PT J AU Itakura, K Maedan, S AF Itakura, K Maedan, S TI Light-front realization of chiral symmetry breaking SO PROGRESS OF THEORETICAL PHYSICS LA English DT Article ID JONA-LASINIO MODEL; (1+1)-DIMENSIONAL PHI(4) THEORY; QUANTUM-FIELD THEORY; ONE TIME DIMENSION; CONE QUANTIZATION; NULL-PLANE; ONE SPACE; QCD; NAMBU; VACUUM AB We discuss a description of chiral symmetry breaking in the light-front (LF) formalism. Based on careful analyses of several models, we give clear answers to the following three fundamental questions: (i) What is the difference between the LF chiral transformation and the ordinary chiral transformation? (ii) How does a gap equation for the chiral condensate emerge? (iii) What is the consequence of the coexistence of a nonzero chiral condensate and the trivial Fock vacuum? The answer to Question (i) is given through a classical analysis of each model. Question (ii) is answered based on our recognition of the importance of characteristic constraints, such as the zero-mode and fermionic constraints. Question (iii) is intimately related to another important problem, reconciliation of the nonzero chiral condensate [<()over cap>psi] not equal 0 and the invariance of the vacuum under the LF chiral transformation Q(5)(LF) \9] = 0. This and Question (iii) are understood in terms of the modified chiral transformation laws of the dependent variables. The characteristic ways in which the chiral symmetry breaking is realized are that the chiral charge Q(5)(LF) is no longer conserved and that the transformation of the scalar and pseudoscalar fields is modified. We also discuss other outcomes, such as the light-cone wave function of the pseudoscalar meson in the Nambu-Jona-Lasinio model. C1 Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. Tokyo Natl Coll Technol, Dept Phys, Tokyo 1938610, Japan. RP Itakura, K (reprint author), Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. NR 51 TC 11 Z9 12 U1 0 U2 0 PU PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PI KYOTO PA C/O KYOTO UNIV, YUKAWA HALL, KYOTO, 606-8502, JAPAN SN 0033-068X J9 PROG THEOR PHYS JI Prog. Theor. Phys. PD APR PY 2001 VL 105 IS 4 BP 537 EP 571 DI 10.1143/PTP.105.537 PG 35 WC Physics, Multidisciplinary SC Physics GA 433UJ UT WOS:000168777900001 ER PT J AU Thornton, KH Krishnan, VV West, MG Popham, J Ramirez, M Thelen, MP Cosman, M AF Thornton, KH Krishnan, VV West, MG Popham, J Ramirez, M Thelen, MP Cosman, M TI Expression, purification, and biophysical characterization of the BRCT domain of human DNA ligase III alpha SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article ID REPAIR PROTEIN XRCC1; BASE EXCISION-REPAIR; STRAND BREAK REPAIR; MEIOTIC RECOMBINATION; MOLECULAR-CLONING; SPECTROSCOPY; MUTATIONS; NMR; SPERMATOCYTES; SENSITIVITY AB The C-terminal regions of several DNA repair and cell cycle checkpoint proteins are homologous to the breast-cancer-associated BRCA-1 protein C-terminal region. These regions, known as BRCT domains, have been found to mediate important protein-protein interactions. We produced the BRCT domain of DNA ligase III alpha (L3[86]) for biophysical and structural characterization. A glutathione S-transferase (GST) fusion with the L3[86] domain (residues 837-922 of ligase III alpha) was expressed in Escherichia coli and purified by glutathione affinity chromatography. The GST fusion protein was removed by thrombin digestion and further purification steps. Using this method, N-15-labeled and C-13/N-15-double-labeled L3[86] proteins were prepared to enable a full determination of structure and dynamics using heteronuclear NMR spectroscopy. To obtain evidence of binding activity to the distal BRCT of the repair protein XRCC1 (X1BRCTb), as well as to provide insight into the interaction between these two BRCT binding partners, the corresponding BRCT heterocomplexes were also prepared and studied. Changes in the secondary structures (amount of helix and sheet components) of the two constituents were not observed upon complex formation. However, the melting temperature of the complex was significantly higher relative to the values obtained for the L3[86] or X1BRCTb proteins alone. This increased thermostability imparted by the interaction between the two BRCT domains may explain why cells require XRCC1 to maintain ligase III alpha activity. (C) 2001 Academic Press. C1 Univ Calif Lawrence Livermore Natl Lab, Biol & BIotechnol Res Program, Mol & Struct Biol Div, Livermore, CA 94551 USA. RP Cosman, M (reprint author), Univ Calif Lawrence Livermore Natl Lab, Biol & BIotechnol Res Program, Mol & Struct Biol Div, Livermore, CA 94551 USA. RI Thelen, Michael/C-6834-2008; Krishnan, Krish/A-6859-2010; Thelen, Michael/G-2032-2014 OI Thelen, Michael/0000-0002-2479-5480; Thelen, Michael/0000-0002-2479-5480 FU NCI NIH HHS [CA76116] NR 34 TC 5 Z9 6 U1 0 U2 1 PU ACADEMIC PRESS INC 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 APR PY 2001 VL 21 IS 3 BP 401 EP 411 DI 10.1006/prep.2001.1391 PG 11 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 418GE UT WOS:000167881900005 PM 11281714 ER PT J AU Bonneau, R Strauss, CEM Baker, D AF Bonneau, R Strauss, CEM Baker, D TI Improving the performance of Rosetta using multiple sequence alignment information and global measures of hydrophobic core formation SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article DE ab initio structure prediction; homology; Rosetta ID PROTEIN SECONDARY STRUCTURE; STRUCTURE PREDICTION; DATABASE SEARCH; ENERGY; FOLDS; RECOGNITION; HOMOLOGS; TERMS; CASP AB This study explores the use of multiple sequence alignment (MSA) information and global measures of hydrophobic core formation for improving the Rosetta ab initio protein structure prediction method. The most effective use of the MSA information is achieved by carrying out independent folding simulations for a subset of the homologous sequences in the MSA and then identifying the free energy minima common to all folded sequences via simultaneous clustering of the independent folding runs, Global measures of hydrophobic core formation, using ellipsoidal rather than spherical representations of the hydrophobic core, are found to be useful in removing non-native conformations before cluster analysis. Through this combination of MSA information and global measures of protein core formation, we significantly increase the performance of Rosetta on a challenging test set. Proteins 2001;43:1-11. (C) 2001 Wiley-Liss, Inc. C1 Univ Washington, Dept Biochem, Seattle, WA 98195 USA. Los Alamos Natl Lab, Biosci Div, Los Alamos, NM USA. RP Baker, D (reprint author), Univ Washington, Dept Biochem, Box 357350, Seattle, WA 98195 USA. EM dabaker@u.washington.edu RI Baker, David/K-8941-2012 OI Baker, David/0000-0001-7896-6217 NR 30 TC 57 Z9 60 U1 0 U2 4 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0887-3585 EI 1097-0134 J9 PROTEINS JI Proteins PD APR 1 PY 2001 VL 43 IS 1 BP 1 EP 11 DI 10.1002/1097-0134(20010401)43:1<1::AID-PROT1012>3.0.CO;2-A PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 408NL UT WOS:000167332200001 PM 11170209 ER PT J AU Bolton, JR Bircher, KG Tumas, W Tolman, CA AF Bolton, JR Bircher, KG Tumas, W Tolman, CA TI Figures-of-merit for the technical development and application of advanced oxidation technologies for both electric- and solar-driven systems - (IUPAC Technical Report) SO PURE AND APPLIED CHEMISTRY LA English DT Article ID AQUEOUS-SOLUTION AB Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (. OH). have emerged as an important class of technologies for accelerating the oxidation land hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological kinetic order regimes: 1)for high contaminant concentrations (electric energy per mass. E-EM or collector area per mass, A(CM)) and 2) for low concentrations (electric energy per order of magnitude, E-EO, or collector area per order of magnitude, A(CO)). Furthermore, a simple understanding of the overall kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zero- or first-order) is shown to be necessary for the description of meaningful electric- or solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electric- or solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals. C1 Bolton Photosci Inc, Ayr, ON N0B 1EO, Canada. Calgon Carbon Corp, Pittsburgh, PA 15230 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Natl Sci Fdn, Div Chem, Arlington, VA 22230 USA. RP Bolton, JR (reprint author), Bolton Photosci Inc, 92 Main St, Ayr, ON N0B 1EO, Canada. NR 18 TC 267 Z9 269 U1 3 U2 47 PU INT UNION PURE APPLIED CHEMISTRY PI RES TRIANGLE PK PA 104 TW ALEXANDER DR, PO BOX 13757, RES TRIANGLE PK, NC 27709-3757 USA SN 0033-4545 J9 PURE APPL CHEM JI Pure Appl. Chem. PD APR PY 2001 VL 73 IS 4 BP 627 EP 637 DI 10.1351/pac200173040627 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA 447WR UT WOS:000169595900001 ER PT J AU Miura, M Morris, GM Micca, PL Lombardo, DT Youngs, KM Kalef-Ezra, JA Hoch, DA Slatkin, DN Ma, RM Coderre, JA AF Miura, M Morris, GM Micca, PL Lombardo, DT Youngs, KM Kalef-Ezra, JA Hoch, DA Slatkin, DN Ma, RM Coderre, JA TI Boron neutron capture therapy of a murine mammary carcinoma using a lipophilic carboranyltetraphenylporphyrin SO RADIATION RESEARCH LA English DT Article ID P-BORONOPHENYLALANINE; GLIOBLASTOMA-MULTIFORME; TUMOR; BIODISTRIBUTION; MICE; NA2B12H11SH; BOROCAPTATE; TOXICITY; SODIUM; GLIOMA AB The first control of a malignant tumor in vivo by porphyrin-mediated boron neutron capture therapy (BNCT) is described, In mice bearing implanted EMT-6 mammary carcinomas, boron uptake using a single injection of either p-boronophenylalanine (BPA) or mercaptoundecahydrododecaborane (BSH) was compared with either a single injection or multiple injections of the carboranylporphyrin CuTCPH, The BSH and BPA doses used were comparable to the highest doses of these compounds previously administered in a single injection to rodents, For BNCT, boron concentrations averaged 85 mug (10)B/g in the tumor and 4 mug (10)B/g in blood 2 days after the last of six injections (over 32 h) that delivered a total of 190 mug CuTCPH/g body weight. During a single 15, 20, 25 or 30 MW-min exposure to the thermalized neutron beam of the Brookhaven Medical Research Reactor, a tumor received average absorbed doses of approximately 39, 52, 66 or 79 Gy, respectively. A long-term (>200 days) tumor control rate of 71% was achieved at a dose of 66 Gy with minimal damage to the leg. Equivalent long-term tumor control by a single exposure to 42 Gy X rays was achieved, but with greater damage to the irradiated leg. (C) 2001 by Radiation Research Society. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Univ Oxford, Churchill Hosp, Res Inst, Oxford OX3 7LJ, England. Univ Ioannina, Sch Med, Dept Med Phys, GR-45110 Ioannina, Greece. RP Miura, M (reprint author), Brookhaven Natl Lab, Dept Med, Bldg 490, Upton, NY 11973 USA. NR 27 TC 36 Z9 37 U1 0 U2 3 PU RADIATION RESEARCH SOC PI LAWRENCE PA 810 E TENTH STREET, LAWRENCE, KS 66044 USA SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD APR PY 2001 VL 155 IS 4 BP 603 EP 610 DI 10.1667/0033-7587(2001)155[0603:BNCTOA]2.0.CO;2 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA 418GB UT WOS:000167881600010 PM 11260662 ER PT J AU Failor, BH Coleman, PL Levine, JS Song, Y Sze, H LePell, PD Coverdale, CA Deeney, C Pressley, L Schneider, R AF Failor, BH Coleman, PL Levine, JS Song, Y Sze, H LePell, PD Coverdale, CA Deeney, C Pressley, L Schneider, R TI Charge-coupled device systems for recording two-dimensional multi-mega-ampere z-pinch data SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID X-RAY POWER; DETECTOR; CAMERAS AB Hardware and software have been developed for recording and displaying accurate image and spectral data produced by z-pinch plasma radiation sources at the Double-EAGLE facility at Maxwell Physics International. Desktop computers are used to acquire the data, analyze it, and display and print the results. Of the four charge-coupled device (CCD) image recording systems implemented, two record x rays directly and two record optical light emission from electron-excited phosphors. The CCD systems required careful shielding to allow them to operate in the harsh radio frequency noise environment. During a series of shots at the SATURN facility at Sandia National Laboratories, the quality of a keV x-ray spectrum recorded directly with a CCD compared well with an equivalent spectrum recorded with 2497 film. (C) 2001 American Institute of Physics. C1 Maxwell Phys Int, San Leandro, CA 94577 USA. KTech Corp, Albuquerque, NM 87123 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Def Threat Reduct Agcy, Alexandria, VA 22310 USA. RP Failor, BH (reprint author), Maxwell Phys Int, San Leandro, CA 94577 USA. NR 12 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 2001 VL 72 IS 4 BP 2023 EP 2031 DI 10.1063/1.1355264 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 415FE UT WOS:000167709500013 ER PT J AU Wang, YX De Carlo, F Mancini, DC McNulty, I Tieman, B Bresnahan, J Foster, I Insley, J Lane, P von Laszewski, G Kesselman, C Su, MH Thiebaux, M AF Wang, YX De Carlo, F Mancini, DC McNulty, I Tieman, B Bresnahan, J Foster, I Insley, J Lane, P von Laszewski, G Kesselman, C Su, MH Thiebaux, M TI A high-throughput x-ray microtomography system at the Advanced Photon Source SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID MICROSCOPY; TOMOGRAPHY AB A third-generation synchrotron radiation source provides enough brilliance to acquire complete tomographic data sets at 100 nm or better resolution in a few minutes. To take advantage of such high-brilliance sources at the Advanced Photon Source, we have constructed a pipelined data acquisition and reconstruction system that combines a fast detector system, high-speed data networks, and massively parallel computers to rapidly acquire the projection data and perform the reconstruction and rendering calculations. With the current setup, a data set can be obtained and reconstructed in tens of minutes. A specialized visualization computer makes rendered three-dimensional (3D) images available to the beamline users minutes after the data acquisition is completed. This system is capable of examining a large number of samples at sub-mum 3D resolution or studying the full 3D structure of a dynamically evolving sample on a 10 min temporal scale. In the near future, we expect to increase the spatial resolution to below 100 nm by using zone-plate x-ray focusing optics and to improve the time resolution by the use of a broadband x-ray monochromator and a faster detector system. (C) 2001 American Institute of Physics. C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. Univ So Calif, Inst Informat Sci, Los Angeles, CA 90089 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Wang, YX (reprint author), Xradia Inc, 4075A Sprig Dr, Concord, CA 94520 USA. RI von Laszewski, Gregor/C-2808-2012; OI von Laszewski, Gregor/0000-0001-9558-179X; Kesselman, Carl/0000-0003-0917-1562 NR 12 TC 101 Z9 101 U1 0 U2 10 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 2001 VL 72 IS 4 BP 2062 EP 2068 DI 10.1063/1.1355270 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 415FE UT WOS:000167709500020 ER PT J AU Fulton, JL Darab, JG Hoffmann, MM AF Fulton, JL Darab, JG Hoffmann, MM TI X-ray absorption spectroscopy and imaging of heterogeneous hydrothermal mixtures using a diamond microreactor cell SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SUPERCRITICAL WATER; MOLECULAR-DYNAMICS; FINE-STRUCTURE; AQUEOUS-SOLUTION; ION; EXAFS; COPPER(I); HYDRATION; XAFS; 300-DEGREES-C AB Hydrothermal synthesis is an important route to novel materials. Hydrothermal chemistry is also an important aspect of geochemistry and a variety of waste remediation technologies. There is a significant lack of information about the speciation of inorganic compounds under hydrothermal conditions. For these reasons we describe a high-temperature, high-pressure cell that allows one to acquire both x-ray absorption fine structure (XAFS) spectra and x-ray transmission and absorption images of heterogeneous hydrothermal mixtures. We demonstrate the utility of the method by measuring the Cu(I) speciation in a solution containing both solid and dissolved Cu phases at temperatures up to 325 degreesC. X-ray imaging of the various hydrothermal phases allows micro-XAFS to be collected from different phases within the heterogeneous mixture. The complete structural characterization of a soluble bichloro-cuprous species was determined. In situ XAFS measurements were used to define the oxidation state and the first-shell coordination structure. The Cu-Cl distance was determined to be 2.12 Angstrom for the CuCl2- species and the complete loss of tightly bound waters of hydration in the first shell was observed. The microreactor cell described here can be used to test thermodynamic models of solubility and redox chemistry of a variety of different hydrothermal mixtures. (C) 2001 American Institute of Physics. C1 Pacific NW Natl Lab, Fundamental Sci Div, Richland, WA 99352 USA. RP Fulton, JL (reprint author), Pacific NW Natl Lab, Fundamental Sci Div, Richland, WA 99352 USA. NR 32 TC 10 Z9 10 U1 2 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 2001 VL 72 IS 4 BP 2117 EP 2122 DI 10.1063/1.1351836 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 415FE UT WOS:000167709500030 ER PT J AU Thurman-Keup, RM Kotwal, AV Tecchio, M Byon-Wagner, A AF Thurman-Keup, RM Kotwal, AV Tecchio, M Byon-Wagner, A TI W boson physics at hadron colliders SO REVIEWS OF MODERN PHYSICS LA English DT Review ID CERN PBARP COLLIDER; = 1.8 TEV; TRANSVERSE-MOMENTUM DISTRIBUTION; RARE DECAY W-+/-->PI(+/-)+GAMMA; IMPROVED PARTON DISTRIBUTIONS; PRODUCTION CROSS-SECTIONS; ALPHA-S CALCULATION; Z-GAMMA PRODUCTION; ART. NO. 052001; TOP-QUARK MASS AB The use of hadron colliders to investigate the properties of the W bosons started in 1982 at the CERN Sp (p) over barS collider. Since then, the Tevatron experiments at Fermilab have recorded a large sample of W events which allowed precision measurements of the properties of W bosons. In this paper the authors review W gauge boson physics at hadron colliders from 1982 to 2000. They first discuss the production mechanism and detection of W bosons in p (p) over bar collisions. After a brief review of the early studies, W boson physics at the Tevatron collider are thoroughly examined. Finally, possible future directions of W boson physics at hadron colliders are discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Duke Univ, Durham, NC 27708 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 166 TC 7 Z9 7 U1 1 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 EI 1539-0756 J9 REV MOD PHYS JI Rev. Mod. Phys. PD APR PY 2001 VL 73 IS 2 BP 267 EP 306 DI 10.1103/RevModPhys.73.267 PG 40 WC Physics, Multidisciplinary SC Physics GA 457FQ UT WOS:000170126800002 ER PT J AU Efroymson, RA Suter, GW Rose, WH Nemeth, S AF Efroymson, RA Suter, GW Rose, WH Nemeth, S TI Ecological risk assessment framework for low-altitude aircraft overflights: I. Planning the analysis and estimating exposure SO RISK ANALYSIS LA English DT Article DE ecological risk assessment; risk assessment; military; aircraft ID LEVEL JET AIRCRAFT; HABITAT SUITABILITY; RESPONSES; NOISE; BEHAVIOR; CARIBOU AB An ecological risk assessment framework for low-altitude aircraft overflights was developed, with special emphasis on military applications. The problem formulation and exposure analysis phases are presented in this article; an analysis of effects and risk characterization is presented in a companion article. The intent of this article is threefold: (1) to illustrate the development of a generic framework for the ecological risk assessment of an activity, (2) to show how the U.S. Environmental Protection Agency's ecological risk assessment paradigm can be applied to an activity other than the release of a chemical, and (3) to provide guidance for the assessment of ecological risks from low-altitude aircraft overflights. The key stressor for low-altitude aircraft overflights is usually sound, although visual and physical (collision) stressors may also be Significant. Susceptible and regulated wildlife populations are the major assessment endpoint entities, although plant communities may be impacted by takeoffs and landings. The exposure analysis utilizes measurements of wildlife locations, measurements of sound levels at the wildlife locations, measurements of slant distances from aircraft to wildlife, medals that extrapolate sound from the source aircraft to the ground, and bird-strike probability models. Some of the challenges to conducting a risk assessment for aircraft overflights include prioritizing potential stressors and endpoints, choosing exposure metrics that relate to wildlife responses, obtaining good estimates of sound or distance, and estimating wildlife locations. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. US EPA, Natl Ctr Environm Assessment, Cincinnati, OH 45268 USA. USA, Construct Engn Res Lab, Champaign, IL USA. RP Efroymson, RA (reprint author), Oak Ridge Natl Lab, Div Environm Sci, MS 6036,POB 2008, Oak Ridge, TN 37831 USA. OI Efroymson, Rebecca/0000-0002-3190-880X NR 38 TC 10 Z9 12 U1 0 U2 10 PU BLACKWELL PUBL LTD PI OXFORD PA 108 COWLEY RD, OXFORD OX4 1JF, OXON, ENGLAND SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD APR PY 2001 VL 21 IS 2 BP 251 EP 262 DI 10.1111/0272-4332.212109 PG 12 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA 442RX UT WOS:000169299700005 PM 11414535 ER PT J AU Efroymson, RA Suter, GW AF Efroymson, RA Suter, GW TI Ecological risk assessment framework for low-altitude aircraft overflights: II. Estimating effects on wildlife SO RISK ANALYSIS LA English DT Article DE ecological risk assessment; risk assessment; military; aircraft ID LEVEL JET AIRCRAFT; MILITARY ACTIVITY; MOUNTAIN SHEEP; RESPONSES; CARIBOU; NOISE; BEHAVIOR; MODEL; BRANT AB An ecological risk assessment framework for aircraft overflights has been developed, with special emphasis on military applications. This article presents the analysis of effects and risk characterization phases; the problem formulation and exposure analysis phases are presented in a companion article. The framework addresses the effects of sound, visual stressors, and collision on the abundance and production of wildlife populations. Profiles of effects, including thresholds, are highlighted for two groups of endpoint species: ungulates (hoofed mammals) and pinnipeds (seals, sea lions, walruses). Several factors complicate the analysis of effects for aircraft overflights. Studies of the effects of aircraft overflights previously have not been associated with a quantitative assessment framework; therefore no consistent relations between exposure and population-level response have been developed. Information on behavioral effects of overflights by military aircraft (or component stressors) on most wildlife species is sparse. Moreover, models that relate behavioral changes to abundance or reproduction, and those that relate behavioral or hearing effects thresholds from one population to another are generally not available. The aggregation of sound frequencies, durations, and the view of the aircraft into the single exposure metric of slant distance is not always the best predictor of effects, but effects associated with more specific exposure metrics (e.g., narrow sound spectra) may not be easily determined or added. The weight of evidence and uncertainty analyses of the risk characterization for overflights are also discussed in this article. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. US EPA, Natl Ctr Environm Assessment, Cincinnati, OH 45268 USA. RP Efroymson, RA (reprint author), Oak Ridge Natl Lab, Div Environm Sci, MS 6036,POB 2008, Oak Ridge, TN 37831 USA. OI Efroymson, Rebecca/0000-0002-3190-880X NR 39 TC 11 Z9 14 U1 3 U2 23 PU BLACKWELL PUBL LTD PI OXFORD PA 108 COWLEY RD, OXFORD OX4 1JF, OXON, ENGLAND SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD APR PY 2001 VL 21 IS 2 BP 263 EP 274 DI 10.1111/0272-4332.212110 PG 12 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA 442RX UT WOS:000169299700006 PM 11414536 ER PT J AU Singer, N AF Singer, N TI Sight unseen - Adaptive optics could improve LASIK and impart superhuman vision SO SCIENTIFIC AMERICAN LA English DT News Item C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Singer, N (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 USA SN 0036-8733 J9 SCI AM JI Sci.Am. PD APR PY 2001 VL 284 IS 4 BP 24 EP 24 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 412DQ UT WOS:000167539100010 ER PT J AU Sharif, AA Misra, A Petrovic, JJ Mitchell, TE AF Sharif, AA Misra, A Petrovic, JJ Mitchell, TE TI Solid solution hardening and softening in MoSi2 alloys SO SCRIPTA MATERIALIA LA English DT Article DE arc melting; hardness testing; intermetallic compounds; mechanical properties ID SINGLE-CRYSTALS; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; MOSI2-BASED ALLOYS; MICROSTRUCTURE; BEHAVIOR C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Univ Michigan, Dept Engn Sci, Flint, MI 48502 USA. RP Sharif, AA (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS K765, Los Alamos, NM 87545 USA. RI Misra, Amit/H-1087-2012 NR 18 TC 22 Z9 23 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD APR 1 PY 2001 VL 44 IS 6 BP 879 EP 884 DI 10.1016/S1359-6462(00)00698-9 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 421VM UT WOS:000168084300004 ER PT J AU Xu, K Russell, AM Chumbley, LS Laabs, FC AF Xu, K Russell, AM Chumbley, LS Laabs, FC TI A deformation processed Al-20%Sn in-situ composite SO SCRIPTA MATERIALIA LA English DT Article DE composites; surface diffusion; mechanical properties; microstructure; extrusion; powder processing ID PLATE-LIKE STRUCTURES; HIGH-STRENGTH; SHAPE INSTABILITIES; INSITU COMPOSITES; POWDER-METALLURGY; NB; MICROSTRUCTURE; TITANIUM; YTTRIUM; ALLOYS C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA. RP Xu, K (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. OI Russell, Alan/0000-0001-5264-0104 NR 20 TC 10 Z9 12 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD APR 1 PY 2001 VL 44 IS 6 BP 935 EP 940 DI 10.1016/S1359-6462(00)00679-5 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 421VM UT WOS:000168084300013 ER PT J AU Radisky, D Hagios, C Bissell, MJ AF Radisky, D Hagios, C Bissell, MJ TI Tumors are unique organs defined by abnormal signaling and context SO SEMINARS IN CANCER BIOLOGY LA English DT Review DE epithelial-stromal interactions; microenvironment; tumor progression ID EPITHELIAL-CELL LINE; HELICOBACTER-PYLORI INFECTION; GROWTH-FACTOR RECEPTOR; EXTRACELLULAR-MATRIX; BASEMENT-MEMBRANE; IN-VIVO; GENE-EXPRESSION; BREAST-CANCER; ULCERATIVE-COLITIS; SKIN FIBROBLASTS AB Many cancer investigations have focussed on the eradication of the cancer cell itself and in doing so, overlook the inherent complexity and heterogeneity of solid tumors. Here, we argue that, in many cases, it is the altered communication within the tumor, rather than mutations per se, that is the defining characteristic of cancer. As a result, tumorigenesis can be indirectly initiated by environmental or inherited factors that affect the stromal cells. We propose that anticancer research might be more effective if aimed at eradicating the cause of abnormality rather than just treating the end result. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Bissell, MJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA. FU NCI NIH HHS [CA-57621] NR 120 TC 110 Z9 115 U1 0 U2 3 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 1044-579X J9 SEMIN CANCER BIOL JI Semin. Cancer Biol. PD APR PY 2001 VL 11 IS 2 BP 87 EP 95 DI 10.1006/scbi.2000.0360 PG 9 WC Oncology SC Oncology GA 429HY UT WOS:000168511800001 PM 11322828 ER PT J AU Pirzada, M Grimes, RW Minervini, L Maguire, JF Sickafus, KE AF Pirzada, M Grimes, RW Minervini, L Maguire, JF Sickafus, KE TI Oxygen migration in A(2)B(2)O(7) pyrochlores SO SOLID STATE IONICS LA English DT Article DE pyrochlore; oxygen transport; defect energies; atomistic simulation; activation energies ID GADOLINIUM ZIRCONATE; OXIDE PYROCHLORES; SOLID-SOLUTIONS; CONDUCTIVITY; DISORDER; FLUORITE; ION; STABILITY AB Atomic scale computer simulation has been used to predict activation energies for oxygen migration. In total, 54 compounds with the A(2)B(2)O(7) pyrochlore structure were simulated. In each case, oxygen migration was assumed to proceed via an oxygen vacancy mechanism with oxygen ions hopping between 48f sites. For some compounds the unoccupied 8a interstitial position played an important role in the migration mechanism. The results were analyzed using a contour map of activation energy versus A cation radius along the ordinate and B cation radius along the abscissa. This identified areas of similar cation radii, which exhibit lower activation energy. Results compare favourably with available experimental data. (C) 2001 Elsevier Science B.V, All rights reserved. C1 Imperial Coll, Dept Mat, London SW7 2BP, England. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. USAF, Res Lab, MLMR, AFRL, Wright Patterson AFB, OH 45433 USA. RP Imperial Coll, Dept Mat, London SW7 2BP, England. EM r.grimes@ic.ac.uk NR 29 TC 139 Z9 140 U1 3 U2 44 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 EI 1872-7689 J9 SOLID STATE IONICS JI Solid State Ion. PD APR PY 2001 VL 140 IS 3-4 BP 201 EP 208 DI 10.1016/S0167-2738(00)00836-5 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 439EU UT WOS:000169098500002 ER PT J AU Cullen, DL Desai, LV Shelnutt, JA Zimmer, M AF Cullen, DL Desai, LV Shelnutt, JA Zimmer, M TI Conformational analysis of the nonplanar deformations of cobalt porphyrin complexes in the Cambridge structural database SO STRUCTURAL CHEMISTRY LA English DT Article DE porphyrin; cluster analysis; normal-coordinate structural deformation; ruffled; saddeled ID MOLECULAR MECHANICAL ANALYSIS; MACROCYCLIC ETHER LIGANDS; CLUSTER-ANALYSIS; TETRAPHENYLPORPHYRIN COMPLEXES; SPECTROSCOPIC PROPERTIES; COFACIAL DIPORPHYRIN; CRYSTAL-STRUCTURE; 6-MEMBERED RINGS; ACTIVE-SITE; STEREOCHEMISTRY AB Principal component analysis, cluster analysis, and various structural parameters have been used to differentiate the nonplanar deformations of cobalt(III) porphyrins. The results were compared with normal-coordinate structural decomposition analysis. Cobalt(III) porphyrins discussed in this paper do not undergo large wav, dom, and pro deformations and they were not considered in our analysis. The cis C alpha -N-N-C-alpha, dihedral angle is the best structural measure of ruffling and it is the only structural parameter that does not overestimate the extent of ruffling due to the presence of saddling. The average distance between the C-beta carbons and the plane comprising the four nitrogens, the four meso carbons and the cobalt ion is the best structural measure of saddling. No structural parameters were found that could be used in principal component analysis to find PC's that quantified the nonplanar deformations in cobalt(III) porphyrins. Cluster analysis was able to separate the sad, ruf, and planar structures, however, the preparation and symmetry adaptation of all the structures was complicated and was no more informative than the use of some of the univarient structural parameters. The NSD deformations are related to the vibrational energies and motions of the macrocycle and are thus the preferred description, but the more easily obtained structural parameters are useful measures of the normal coordinate deformations whenever a full NSD analysis is not possible. C1 Connecticut Coll, Dept Chem, New London, CT 06320 USA. Sandia Natl Labs, Biomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. RP Zimmer, M (reprint author), Connecticut Coll, Dept Chem, New London, CT 06320 USA. RI Shelnutt, John/A-9987-2009; zimmer, Marc/B-8646-2009 OI Shelnutt, John/0000-0001-7368-582X; NR 71 TC 5 Z9 5 U1 0 U2 7 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1040-0400 J9 STRUCT CHEM JI Struct. Chem. PD APR PY 2001 VL 12 IS 2 BP 127 EP 136 DI 10.1023/A:1016666222766 PG 10 WC Chemistry, Multidisciplinary; Chemistry, Physical; Crystallography SC Chemistry; Crystallography GA 458MK UT WOS:000170198000005 ER PT J AU Lu, SW List, FA Lee, DF Cui, X Paranthaman, M Kang, BW Kroeger, DM Goyal, A Martin, PM Ericson, RE AF Lu, SW List, FA Lee, DF Cui, X Paranthaman, M Kang, BW Kroeger, DM Goyal, A Martin, PM Ericson, RE TI Electron beam co-evaporation of Y-BaF2-Cu precursor films for YBa2Cu3O7-y coated conductors SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article ID CRITICAL-CURRENT DENSITY; BUFFER LAYERS; THIN-FILMS; SUPERCONDUCTING TAPES; LASER DEPOSITION; YBCO FILMS; NI; ALLOY AB Y-BaF2-Cu precursor films for Y-Ba2CU3O7-y (YBCO) coated conductors have been deposited on both uncoated nickel and Rolling Assisted Biaxially Textured Substrate (RABiTS (TM)) tapes by electron beam coevaporation. The water partial pressure was kept constant at 1 x 10(-5) Ton. during the deposition in order to control the oxygen content in the precursor films. Rutherford backscattering spectroscopy measurements indicate an average composition of Y:Ba:Cu of 1.05:2.10:3.0 with a standard deviation of less than 2.0%. This result was obtained for both moving and stationary tapes. The thickness variation of such precursor films is less than 2.5% over lengths of up to 1 m. Films up to 5 mum thick have been deposited on a stationary tape. An end-to-end J(c) of 100 000 A cm(-2) from a 1 m length of RABiTS (TM) sample has been obtained with the highest J(c) of 774 000 A cm(-2) in a short section within the tape. The present research demonstrates a possible route for industrial scale-up using electron beam coevaporation of YBCO precursors. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. 3M Co, Corp Analyt Technol Ctr, St Paul, MN 55144 USA. RP Lu, SW (reprint author), Informat Prod Inc, Holland, MI 49423 USA. RI Paranthaman, Mariappan/N-3866-2015 OI Paranthaman, Mariappan/0000-0003-3009-8531 NR 23 TC 13 Z9 14 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD APR PY 2001 VL 14 IS 4 BP 218 EP 223 DI 10.1088/0953-2048/14/4/307 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 430CJ UT WOS:000168555700011 ER PT J AU Nenes, A Ghan, S Abdul-Razzak, H Chuang, PY Seinfeld, JH AF Nenes, A Ghan, S Abdul-Razzak, H Chuang, PY Seinfeld, JH TI Kinetic limitations on cloud droplet formation and impact on cloud albedo SO TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY LA English DT Article ID DOPPLER RADAR; PARAMETERIZATION; STRATOCUMULUS; ASTEX; PARTICLES; STRATUS AB Under certain conditions mass transfer limitations on the growth of cloud condensation nuclei (CCN) may have a significant impact on the number of droplets that can Form in a cloud. The assumption that particles remain in equilibrium until activated may therefore not always be appropriate for aerosol populations existing in the atmosphere. This work identifies three mechanisms that lead to kinetic limitations, the effect of which on activated cloud droplet number and cloud albedo is assessed using a one-dimensional cloud parcel model with detailed microphysics for a variety of aerosol size distributions and updraft velocities. In assessing the effect of kinetic limitations, we have assumed as cloud droplets not only those that are strictly activated las dictated by classical Kohler theory). but also unactivated drops large enough to have an Impact on cloud optical properties. Aerosol number concentration is found to be the key parameter that controls the significance of kinetic effects. Simulations indicate that the equilibrium assumption leads to an overprediction of droplet number by less than 10% for marine aerosol; this overprediction can exceed 40% for urban type aerosol. Overall. the effect of kinetic limitations on cloud albedo can be considered important when equilibrium activation theory consistently overpredicts droplet number by more than 10%. The maximum change in cloud albedo as a result of kinetic limitations is less than 0.005 for cases such as marine aerosol; however albedo differences can exceed 0.1 under more polluted conditions. Kinetic limitations are thus not expected to be climatically significant on a global scale, but can regionally have a large impact on cloud albedo. C1 CALTECH, Dept Chem Engn, Pasadena, CA 91125 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. Texas A&M Univ, Kingsville, TX 78363 USA. Natl Ctr Atmospher Res, Boulder, CO 80307 USA. RP Seinfeld, JH (reprint author), CALTECH, Dept Chem Engn, Mail Code 210-41, Pasadena, CA 91125 USA. RI Ghan, Steven/H-4301-2011 OI Ghan, Steven/0000-0001-8355-8699 NR 20 TC 121 Z9 122 U1 1 U2 15 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0280-6509 J9 TELLUS B JI Tellus Ser. B-Chem. Phys. Meteorol. PD APR PY 2001 VL 53 IS 2 BP 133 EP 149 DI 10.1034/j.1600-0889.2001.d01-12.x PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 451PP UT WOS:000169810700003 ER PT J AU Temesgen, B Brown, GR Harry, DE Kinlaw, CS Sewell, MM Neale, DB AF Temesgen, B Brown, GR Harry, DE Kinlaw, CS Sewell, MM Neale, DB TI Genetic mapping of expressed sequence tag polymorphism (ESTP) markers in loblolly pine (Pinus taeda L.) SO THEORETICAL AND APPLIED GENETICS LA English DT Article DE expressed sequence tag (EST); denaturing gradient gel electrophoresis (DGGE); genetic marker; genetic linkage map; loblolly pine (Pinus taeda L.) ID GRADIENT GEL-ELECTROPHORESIS; LINKAGE MAP; OUTBRED PEDIGREE; CDNA CLONES; DNA; GENOMES; RFLP; SUBSTITUTIONS; CONSTRUCTION; LOCI AB The development and mapping of genetic markers based upon expressed sequence tag polymorphisms (ESTPs) in loblolly pine (Pinus taeda L.) are reported. The new markers were generated by PCR-amplification of loblolly pine genomic DNAs with primers designed from sequenced cDNAs. The cDNA libraries were constructed from RNAs expressed in the needles of loblolly pine seedlings or in the xylem from young trees. DNA polymorphisms were identified by analyzing the amplified products for differences in fragment size or restriction sites, or by examining mobility differences using denaturing gradient gel electrophoresis (DGGE). DGGE revealed more DNA polymorphisms than the other two methods. Fifty six ESTPs were mapped using either of two mapping populations and positioned onto a loblolly pine consensus genetic map. Unlike many other markers commonly used in forestry, ESTPs can be used as orthologous markers for comparative mapping, to map genes of known function, or to identify candidate genes affecting important traits in loblolly pine. C1 Univ Calif Davis, USDA, Forest Serv,Dept Environm Hort, Inst Forest Genet,Pacific SW Res Stn, Davis, CA 95616 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Neale, DB (reprint author), Univ Calif Davis, USDA, Forest Serv,Dept Environm Hort, Inst Forest Genet,Pacific SW Res Stn, Davis, CA 95616 USA. NR 31 TC 55 Z9 77 U1 0 U2 1 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0040-5752 J9 THEOR APPL GENET JI Theor. Appl. Genet. PD APR PY 2001 VL 102 IS 5 BP 664 EP 675 DI 10.1007/s001220051695 PG 12 WC Agronomy; Plant Sciences; Genetics & Heredity; Horticulture SC Agriculture; Plant Sciences; Genetics & Heredity GA 427KQ UT WOS:000168403700003 ER PT J AU Simeonova, PP Wang, SY Kashon, ML Kommineni, C Crecelius, E Luster, MI AF Simeonova, PP Wang, SY Kashon, ML Kommineni, C Crecelius, E Luster, MI TI Quantitative relationship between arsenic exposure and AP-1 activity in mouse urinary bladder epithelium SO TOXICOLOGICAL SCIENCES LA English DT Article DE cancer causes; risk assessment; EPA levels; arsenic; cancer; mechanism ID DRINKING-WATER; DIMETHYLARSINIC ACID; CELL-PROLIFERATION; CANCER MORTALITY; C-JUN; INDUCTION; PROMOTER; FOS; TRANSFORMATION; ACTIVATION AB Because of the potential of arsenic for causing cancer in humans, and of the fact of widespread environmental and occupational exposure, deriving acceptable human-limit values has been of major concern to industry as well as to regulatory agencies. Based upon epidemiological evidence and mechanistic studies, it has been argued that a non-linear dose-response model at low-level exposures is more appropriate for calculating risk than the more commonly employed linear-response models. In the present studies, dose-response relationships and recovery studies employing a cancer precursor marker, i.e., activating protein (AP)-1 DNA-binding activity, were examined in bladders of mice exposed to arsenic in drinking water and compared to histopathological changes and arsenic tissue levels in the same tissue. While AP-I is a functionally pleomorphic transcription factor regulating diverse gene activities, numerous studies have indicated that activation of the MAP kinase pathway and subsequently increased AP-1 binding activities, is a precursor for arsenic-induced cancers of internal organs as well as the skin. We observed previously that within 8 weeks of exposure AP-I activation occurs in urinary bladder tissue of mice exposed to arsenic in the drinking water. In the present studies, C57BL/6 mice were exposed to sodium arsenite at various concentrations in the drinking water for 8 consecutive weeks. Minimal but observable AP-I activity occurred in bladder tissue at exposure levels below which histopathological changes or arsenic tissue accumulation was detected. Marked AP-1 DNA-binding activity only occurred at exposure levels of sodium arsenite above 20 mug/ml, where histopathological changes and accumulation of arsenic in the urinary bladder epithelium occurred. Although the experimental design did not allow statistical modeling of the entire dose-response curve, the general shape of the dose-response curve is not inconsistent with the previously proposed hypothesis that arsenic-induced cancer follows a non-linear dose-response model. C1 NIOSH, Toxicol & Mol Biol Branch, Morgantown, WV 26505 USA. NIOSH, Biostat Branch, Morgantown, WV 26505 USA. NIOSH, Pathol & Physiol Res Branch, Morgantown, WV 26505 USA. Battelle Marine Sci Lab, Sequim, WA 98382 USA. RP Luster, MI (reprint author), NIOSH, Toxicol & Mol Biol Branch, 1095 Willowdale Rd, Morgantown, WV 26505 USA. NR 32 TC 27 Z9 27 U1 0 U2 1 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1096-6080 J9 TOXICOL SCI JI Toxicol. Sci. PD APR PY 2001 VL 60 IS 2 BP 279 EP 284 DI 10.1093/toxsci/60.2.279 PG 6 WC Toxicology SC Toxicology GA 414KU UT WOS:000167666400011 PM 11248140 ER PT J AU Hanson, PJ Todd, DE Amthor, JS AF Hanson, PJ Todd, DE Amthor, JS TI A six-year study of sapling and large-tree growth and mortality responses to natural and induced variability in precipitation and throughfall SO TREE PHYSIOLOGY LA English DT Article DE Acer rubrum; Cornus florida; climate change; drought; Liriodendron tulipifera; Nyssa sylvatica; phenology; Quercus alba; Quercus prinus; soil water ID CO2-INDUCED CLIMATE CHANGE; EASTERN NORTH-AMERICA; UPLAND OAK FOREST; WATER RELATIONS; DECIDUOUS FOREST; RADIAL GROWTH; DROUGHT; STRESS; FIELD; MODEL AB Global climatic change may cause changes in regional precipitation that have important implications for forest growth in the southern United States. In 1993, a stand-level experiment was initiated on Walker Branch Watershed, Tennessee, to study the sensitivity of forest saplings and large trees to changes in soil water content. Soil water content was manipulated by gravity-driven transfer of precipitation throughfall from a dry treatment plot (-33%) to a wet treatment plot (+33%). A control plot was included. Each plot was 6400 m(2). Measurements of stem diameter and observations of mortality were made on large trees and saplings of Acer rubrum L., Cornus florida L., Liriodendron tulipifera L., Nyssa sylvatica Marsh, Quercus alba L. and Quercus prinus L. every 2 weeks during six growing seasons. Saplings of C. florida and A. rubrum grew faster and mortality was less on the wet plot compared with the dry and control plots, through 6 years of soil water manipulation. Conversely, diameter growth of large trees was unaffected by the treatments. However, tree diameter growth averaged across treatments was affected by year-to-year changes in soil water status. Growth in wet years was as much as 2-3 times greater than in dry years. Relationships between tree growth, phenology and soil water potential were consistent among species and quantitative expressions were developed for application in models. These field growth data indicate that differences in seasonal patterns of rainfall within and between years have greater impacts on growth than percentage changes in rainfall applied to all rainfall events. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Hanson, PJ (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. RI Hanson, Paul J./D-8069-2011; Young, Kristina/M-3069-2014; Amthor, Jeffrey/L-6089-2016 OI Hanson, Paul J./0000-0001-7293-3561; Amthor, Jeffrey/0000-0001-8601-403X NR 74 TC 71 Z9 72 U1 2 U2 30 PU HERON PUBLISHING PI VICTORIA PA 202, 3994 SHELBOURNE ST, VICTORIA, BC V8N 3E2, CANADA SN 0829-318X J9 TREE PHYSIOL JI Tree Physiol. PD APR PY 2001 VL 21 IS 6 BP 345 EP 358 PG 14 WC Forestry SC Forestry GA 421MB UT WOS:000168067200001 PM 11282574 ER PT J AU Barcellos-Hoff, MH AF Barcellos-Hoff, MH TI Three down and counting: the transformation of human mammary cells from normal to malignant in three steps SO TRENDS IN MOLECULAR MEDICINE LA English DT Editorial Material ID CANCER AB An array of genetic mutations associated with human breast cancers has been identified, However, which specific combination of mutations permit normal cells to form breast cancer remains unknown. Elenbaas et al. recently described an experimental system for studying the genetic requirements for the development of breast cancer. C1 Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Barcellos-Hoff, MH (reprint author), Lawrence Berkeley Natl Lab, Div Life Sci, Bldg 74-174,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 1471-4914 J9 TRENDS MOL MED JI Trends Mol. Med PD APR PY 2001 VL 7 IS 4 BP 142 EP 143 DI 10.1016/S1471-4914(01)01984-0 PG 2 WC Biochemistry & Molecular Biology; Cell Biology; Medicine, Research & Experimental SC Biochemistry & Molecular Biology; Cell Biology; Research & Experimental Medicine GA 453TP UT WOS:000169932800002 PM 11286925 ER PT J AU Ajayi, OO Alzoubi, MF Erdemir, A Fenske, GR AF Ajayi, OO Alzoubi, MF Erdemir, A Fenske, GR TI Effect of carbon coating on scuffing performance in diesel fuels SO TRIBOLOGY TRANSACTIONS LA English DT Article; Proceedings Paper CT ASME/STLE Tribology Conference CY OCT 01-04, 2000 CL SEATTLE, WASHINGTON SP Soc Tribologists & Lubricat Engineers, ASME DE carbon coatings; scuffing; diesel fuels ID DIAMOND-LIKE CARBON; LUBRICITY; FRICTION; FILMS AB Low-sulfur and low-aromatic diesel fuels are being introduced in order to reduce various types of emissions in diesel engines to levels in compliance with current and impending U.S. federal regulations. The low lubricity of these fuels, however, poses major reliability and durability problem for fuel injection components that depend on diesel fuel for their lubrication. In the present study, the authors evaluated the scuff resistance of surfaces in regular diesel fuel containing 500 ppm sulfur and in Fischer-Tropsch synthetic diesel fuel containing no sulfur or aromatics. Tests were conducted with the high frequency reciprocating test rig (HFRR) using 52100 steel balls and H-13 tool-steel flats with and without Argonne's special carbon coatings. Test results showed that the sulfur-containing fuels have about 20% higher scuffing resistance that does fuel without sulfur. The presence of the carbon coating on the flat increased scuffing resistance in both regular and synthetic fuels by about ten times, as measured by the contact severity index at scuffing. Coating removal was observed to be a necessary, but not sufficient condition for scuffing failure in tests conducted with coated surfaces. The loss of coating from the surface occurred by the two distinct mechanisms of spalling and wear. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Ajayi, OO (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 20 TC 6 Z9 6 U1 1 U2 5 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 840 BUSSE HIGHWAY, PARK RIDGE, IL 60068 USA SN 1040-2004 J9 TRIBOL T JI Tribol. Trans. PD APR PY 2001 VL 44 IS 2 BP 298 EP 304 DI 10.1080/10402000108982462 PG 7 WC Engineering, Mechanical SC Engineering GA 417NL UT WOS:000167841000025 ER PT J AU Zhu, Y Egerton, RF Malac, M AF Zhu, Y Egerton, RF Malac, M TI Concentration limits for the measurement of boron by electron energy-loss spectroscopy and electron-spectroscopic imaging SO ULTRAMICROSCOPY LA English DT Article DE electron energy-loss spectroscopy; boron; detection limit; elemental mapping ID NEUTRON-CAPTURE THERAPY AB We have shown that energy-loss spectroscopy in a medium-voltage transmission electron microscope can measure concentrations of boron tin a carbon matrix) down to 0.2 %, with 10% accuracy. The detection limit is determined by electron-beam shot-noise statistics and by gain variations in the photodiode or charge-coupled-diode array. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Appl Sci, Div Mat Sci, Upton, NY 11973 USA. Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. RP Zhu, Y (reprint author), Brookhaven Natl Lab, Dept Appl Sci, Div Mat Sci, Bldg 480,POB 5000, Upton, NY 11973 USA. NR 14 TC 13 Z9 13 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD APR PY 2001 VL 87 IS 3 BP 135 EP 145 DI 10.1016/S0304-3991(00)00094-2 PG 11 WC Microscopy SC Microscopy GA 443AC UT WOS:000169316300004 PM 11330500 ER PT J AU Babu, SS David, SA Quintana, MA AF Babu, SS David, SA Quintana, MA TI Modeling microstructure development in self-shielded flux cored arc welds SO WELDING JOURNAL LA English DT Article ID ALLOY-STEEL WELDS; INCLUSION FORMATION; METAL; TOUGHNESS; ELECTRODES AB Microstructure evolution in two self-shielded flux cored arc welds was investigated. Depending on the aluminum concentration, the two welds exhibited different microstructures. Welds with high aluminum concentration contained skeletal delta-ferrite microstructure. In contrast, welds with low aluminum concentration showed classic a-ferrite morphology. This difference in microstructure evolution is attributed to the relative stability of delta-ferrite and austenite during solidification and at high temperature after solidification. This microstructure development was successfully evaluated using computational thermodynamics and kinetic calculations. C1 Oak Ridge Natl Lab, Oak Ridge, TN USA. Lincoln Elect Co, Cleveland, OH USA. RP Babu, SS (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. RI Babu, Sudarsanam/D-1694-2010 OI Babu, Sudarsanam/0000-0002-3531-2579 NR 23 TC 17 Z9 18 U1 0 U2 4 PU AMER WELDING SOC PI MIAMI PA 550 N W LEJEUNE RD, MIAMI, FL 33126 USA SN 0043-2296 J9 WELD J JI Weld. J. PD APR PY 2001 VL 80 IS 4 BP 91S EP 97S PG 7 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 746KT UT WOS:000186746100017 ER PT J AU Quintana, MA McLane, J Babu, SS David, SA AF Quintana, MA McLane, J Babu, SS David, SA TI Inclusion formation in self-shielded flux cored arc welds SO WELDING JOURNAL LA English DT Article; Proceedings Paper CT 80th Annual Meeting of the American-Welding-Society CY APR 12-15, 1999 CL ST LOUIS, MISSOURI SP Amer Welding Soc DE self-shielded flux cored; oxide inclusions; nitride inclusions; nonmetallic inclusions; aluminum oxide; aluminum nitride ID ALLOY-STEEL WELDS; MICROSTRUCTURE; METAL; ELECTRODES; TOUGHNESS AB Nonmetallic inclusions in two weld metals were characterized with respect to variations in weld aluminum concentration. Two self-shielded flux cored arc welding (FCAW-S) electrodes were used to produce welds for optical, scanning and transmission electron microscopy. The inclusions in the weld with high-aluminum concentration were predominantly aluminum nitride. In contrast, the inclusions in welds with low-aluminum and high-titanium concentrations were mostly aluminum oxide and titanium carbonitrides. The measurements were compared with predictions from multiphase, multicomponent thermodynamic equilibrium calculations. The calculations agreed with the experimental measurements and predicted the formation of aluminum nitride in high-aluminum welds and also simultaneous formation of aluminum oxide and titanium carbonitrides. However, the predicted volume fractions were lower than experimental values. C1 Lincoln Elect Co, Cleveland, OH USA. Everready Battery Co, Cleveland, OH USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Quintana, MA (reprint author), Lincoln Elect Co, Cleveland, OH USA. RI Babu, Sudarsanam/D-1694-2010 OI Babu, Sudarsanam/0000-0002-3531-2579 NR 21 TC 20 Z9 21 U1 0 U2 2 PU AMER WELDING SOC PI MIAMI PA 550 N W LEJEUNE RD, MIAMI, FL 33126 USA SN 0043-2296 J9 WELD J JI Weld. J. PD APR PY 2001 VL 80 IS 4 BP 98S EP 105S PG 8 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 746KT UT WOS:000186746100018 ER PT J AU Vianco, PT Rejent, JA AF Vianco, PT Rejent, JA TI A furnace process for structural soldering SO WELDING JOURNAL LA English DT Editorial Material C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Vianco, PT (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER WELDING SOC PI MIAMI PA 550 N W LEJEUNE RD, MIAMI, FL 33126 USA SN 0043-2296 J9 WELD J JI Weld. J. PD APR PY 2001 VL 80 IS 4 BP 217 EP 219 PG 3 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 746KT UT WOS:000186746100014 ER PT J AU Biggs, JR Bennett, KD Fresquez, PR AF Biggs, JR Bennett, KD Fresquez, PR TI Relationship between home range characteristics and the probability of obtaining successful global positioning system (GPS) collar positions for elk in New Mexico SO WESTERN NORTH AMERICAN NATURALIST LA English DT Article DE radio collar; global positioning system; position acquisition rate; elk ID SATELLITE TELEMETRY; HABITAT USE; PERFORMANCE; LOCATIONS; SHEEP AB We compared the ability of global positioning system (GPS) radio collars deployed on elk (Cervus elaphus nelsoni) to obtain valid positions (position acquisition rate [PARI) in seasonal home ranges with differing vegetation and topographical characteristics. We also compared CPS collar PARs under varying levels of cloud cover and within differing daily time periods. We recorded a mean PAR of 69% (n = 10 elk, s = 14%) for collared elk. Multiple regression analysis of seasonal home range characteristics indicated that vegetation cover type and slope, either as individual variables or in combination with one another were not significant predictors of GPS collar PARs. We did not observe statistical differences in position acquisition rates between cloud cover classes or varying cloud base heights. PAR was significantly higher between 1600 h and 2000 h (mountain standard time) compared to 0000 h-1200 h, which ma, have been due to elk behavior. We believe using GPS collars is a more effective and efficient method of tracking elk in our study area than using very-high-frequency (VHF) collars since GPS collars can be programmed to obtain fixes automatically, have fewer logistical problems, and are more economical with long-term data collection efforts. C1 Univ Calif Los Alamos Natl Lab, Ecol Grp, Los Alamos, NM 87545 USA. RP Biggs, JR (reprint author), Univ Calif Los Alamos Natl Lab, Ecol Grp, POB 1663, Los Alamos, NM 87545 USA. NR 32 TC 17 Z9 18 U1 2 U2 9 PU BRIGHAM YOUNG UNIV PI PROVO PA 290 LIFE SCIENCE MUSEUM, PROVO, UT 84602 USA SN 1527-0904 J9 WEST N AM NATURALIST JI West. North Am. Naturalist PD APR PY 2001 VL 61 IS 2 BP 213 EP 222 PG 10 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 427RB UT WOS:000168418300008 ER PT J AU Hooper, RW de Almeida, VF Macosko, CW Derby, JJ AF Hooper, RW de Almeida, VF Macosko, CW Derby, JJ TI Transient polymeric drop extension and retraction in uniaxial extensional flows SO JOURNAL OF NON-NEWTONIAN FLUID MECHANICS LA English DT Article DE elasticity; viscoelastic fluid; boundary element method ID BOUNDARY INTEGRAL METHOD; FINITE-ELEMENT METHODS; INTERFACIAL-TENSION; ELONGATIONAL FLOW; DEFORMATION; BLENDS; MORPHOLOGY; VISCOSITY; RECOVERY; STEADY AB We present results from modeling the deformation of a viscoelastic drop suspended in another viscoelastic fluid subjected to uniaxial extensional flow using the DEVSSG-FEM. Viscoelasticity is implemented using the Oldroyd-B constitutive relation for both the drop and surrounding matrix fluids. To allow efficient solution of the discretized problem, we employ an implicit temporal integration scheme with an accelerated quasi-Newton method. Important viscoelastic effects for both drop deformation during extensional flow and drop retraction following cessation of flow are elucidated. Viscoelastic drops in a Newtonian matrix lengthen less at steady state extension than Newtonian drops because of the accommodation of stress by elasticity. However, the stored elastic effects cause rapid tip retraction during the recovery of polymeric drops, Drops stretched in a viscoelastic exterior flow are enhanced in length compared to those in a Newtonian matrix because of first normal stresses from the matrix. During recovery, drops in a viscoelastic matrix can exhibit significant lengthening upon cessation of extensional flows, causing additional strain before retraction, This behavior is strongly dependent on the details of the exterior flow. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Minnesota, Minnesota Supercomp Inst, Army HPC Res Ctr, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RP Derby, JJ (reprint author), Univ Minnesota, Minnesota Supercomp Inst, Army HPC Res Ctr, Dept Chem Engn & Mat Sci, 151 Amundson Hall,421 Washington Ave SE, Minneapolis, MN 55455 USA. RI Derby, Jeffrey/B-9706-2009; de Almeida, Valmor/P-5498-2016; OI de Almeida, Valmor/0000-0003-0899-695X; Derby, Jeffrey/0000-0001-6418-2155 NR 35 TC 43 Z9 43 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0257 J9 J NON-NEWTON FLUID JI J. Non-Newton. Fluid Mech. PD MAR 31 PY 2001 VL 98 IS 2-3 BP 141 EP 168 DI 10.1016/S0377-0257(01)00112-4 PG 28 WC Mechanics SC Mechanics GA 436AF UT WOS:000168913800004 ER PT J AU Mitlin, D Dahmen, U Radmilovic, V Morris, JW AF Mitlin, D Dahmen, U Radmilovic, V Morris, JW TI Precipitation and hardening in Al-Si-Ge SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article DE precipitation; hardening; Al-Si-Ge ID CAVITY NUCLEATION; ALLOYS AB The principal focus of this work is to explain precipitation in Al-lat.%Si-la%Ge. The microstructure is characterized using conventional and high resolution transmission electron microscopy. as well as energy dispersive X-ray spectroscopy. The first precipitates to come out of solid solution have a cube-cube orientation relationship with the matrix. High resolution TEM demonstrated that all the precipitates start out, and remain multiply twinned throughout the aging treatment. Any twinned section of the precipitate no longer maintains a low index interface with the matrix. and consequently goes from a crystallographic to a spherical interface with the matrix. This explains the equiaxed shape of the Si-Ge precipitates. There is a variation in the stoichiometry of the precipitates. with the mean composition being Si-44.5 at.%Ge. It is also shown that in Al-Si-Ge it is not possible to achieve satisfactory hardness through conventional heat treatment. This result is explained in terms of sluggish precipitation of the diamond-cubic Si-Ge phase coupled with particle coarsening. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. RP Mitlin, D (reprint author), Univ Calif Berkeley, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. RI Mitlin , David /M-5328-2016 OI Mitlin , David /0000-0002-7556-3575 NR 17 TC 16 Z9 17 U1 0 U2 7 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAR 31 PY 2001 VL 301 IS 2 BP 231 EP 236 DI 10.1016/S0921-5093(00)01799-8 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 401DA UT WOS:000166910800016 ER PT J AU Miller, MC Mohrenweiser, HW Bell, DA AF Miller, MC Mohrenweiser, HW Bell, DA TI Genetic variability in susceptibility and response to toxicants SO TOXICOLOGY LETTERS LA English DT Article; Proceedings Paper CT 38th European Congress of Toxicology CY SEP 17-20, 2000 CL LONDON, ENGLAND DE xenobiotics; variability; polymorphisms; DNA adducts; DNA repair; genetic risk ID GLUTATHIONE-S-TRANSFERASE; ARYLAMINE N-ACETYLTRANSFERASE; NUCLEOTIDE EXCISION-REPAIR; BLADDER-CANCER RISK; AMYOTROPHIC-LATERAL-SCLEROSIS; SQUAMOUS-CELL CARCINOMA; GSTM1 NULL GENOTYPE; DNA-REPAIR; ACETYLATOR PHENOTYPE; COLORECTAL-CANCER AB Everyone has a unique combination of polymorphic traits that modify susceptibility and response to drugs, chemicals and carcinogenic exposures. The metabolism of exogenous and endogenous chemical toxins may be modified by inherited and induced variation in CYP (P450), acetyltransferase (NAT) and glutathione S-transferase (GST) genes. We observe that specific 'at risk' genotypes for GSTM1 and NAT1/2 increase risk for bladder cancer among smokers. Genotypic and phenotypic variation in DNA repair may affect risk of somatic mutation and cancer. Variants of base excision and nucleotide excision repair genes (XRCC1 and XPD) appear to modify exposure-induced damage from cigarette smoke and radiation. We are currently engaged in discovering genetic variation in environmental response genes and determining if this variation has any effect on gene function or if it is associated with disease risk. These and other results are discussed in the context of evaluating inherited or acquired susceptibility risk factors for environmentally caused disease. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved. C1 NIEHS, Res Triangle Pk, NC 27709 USA. Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA USA. RP Bell, DA (reprint author), NIEHS, POB 12233,111 Alexander Dr,Bldg 101,Room B323, Res Triangle Pk, NC 27709 USA. FU NIEHS NIH HHS [Y1-ES-8054-05] NR 95 TC 110 Z9 115 U1 1 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD MAR 31 PY 2001 VL 120 IS 1-3 BP 269 EP 280 DI 10.1016/S0378-4274(01)00279-X PG 12 WC Toxicology SC Toxicology GA 426EK UT WOS:000168336700031 PM 11323185 ER PT J AU Skurski, P Gutowski, M Barrios, R Simons, J AF Skurski, P Gutowski, M Barrios, R Simons, J TI Non-ionic and zwitterionic forms of neutral arginine - an ab initio study SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MOLECULAR-ORBITAL METHODS; DIPOLE-BOUND ANIONS; GAUSSIAN-TYPE BASIS; GAS-PHASE; ELECTRONIC-STRUCTURE; ORGANIC-MOLECULES; GLYCINE; BINDING AB dSix low-energy structures of arginine were studied at the zero-point corrected CCSD/6-31 ++G(d,p)+5(sp)//MP2/ 6-31++G(d,p)+5(sp) level. Two new non-ionic structures were identified, one of which is 1.75 kcal/mol lower than any previously reported structure. Two new zwitterion conformers are lower in energy than any previously reported zwitterion. The lowest non-ionic structure is lower in energy than the lowest zwitterion by 2.8 kcal/mol at our highest level of theory, and for no basis or theory level is a zwitterion structure suggested to be the global minimum. Finally, we also examined, at Koopmans' theorem level, the electron binding energies of the six structures. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Utah, Dept Chem, Henry Eyring Ctr Theoret Chem, Salt Lake City, UT 84112 USA. Univ Gdansk, Dept Chem, PL-80952 Gdansk, Poland. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Simons, J (reprint author), Univ Utah, Dept Chem, Henry Eyring Ctr Theoret Chem, Salt Lake City, UT 84112 USA. EM simons@chemistry.utah.edu NR 26 TC 43 Z9 43 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAR 30 PY 2001 VL 337 IS 1-3 BP 143 EP 150 DI 10.1016/S0009-2614(01)00166-X PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 417CY UT WOS:000167818900023 ER PT J AU Granger, DE Riebe, CS Kirchner, JW Finkel, RC AF Granger, DE Riebe, CS Kirchner, JW Finkel, RC TI Modulation of erosion on steep granitic slopes by boulder armoring, as revealed by cosmogenic Al-26 and Be-10 SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article DE cosmogenic elements; erosion; granitic rocks; weathering; boulders ID ALLUVIAL SEDIMENT; SOIL PRODUCTION; SIERRA-NEVADA; HALF-LIFE; RATES; NUCLIDES; EQUILIBRIUM; SURFACES; SIMULATIONS; TOPOGRAPHY AB Cosmogenic Al-26 and Be-10 in quartz from boulders, bedrock and sandy sediment from 21 small watersheds in the Diamond Mountains batholith, CA, USA, and two small watersheds from the nearby Fort Sage Mountains confirm that exposed granitic bedrock and boulders erode more slowly than the catchments in which they are found. Exposed bedrock and boulders are more abundant on steep slopes and may play an important role in regulating mountain erosion rates. Rapid transport of fine sediment on steep slopes exhumes resistant corestones which accumulate on the surface. The resulting boulder lag apparently shields the underlying soil and bedrock from erosion, even when the bedrock is deeply weathered and friable. Where steep slopes have an abundant boulder lag, they erode as slowly as gentler slopes nearby. In contrast, steep slopes lacking a boulder lag erode much more quickly than gentle slopes. Boulder armoring can modulate hillslope erosion such that erosion rates of summits, steep mountain flanks, and gentle footslopes are indistinguishable, thus permitting local relief and steep mountain slopes to persist for long periods of time. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Purdue Univ, PRIME Lab, W Lafayette, IN 47907 USA. Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47907 USA. Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA. Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. RP Granger, DE (reprint author), Purdue Univ, PRIME Lab, W Lafayette, IN 47907 USA. RI Kirchner, James/B-6126-2009; Riebe, Clifford/B-7670-2012 OI Kirchner, James/0000-0001-6577-3619; NR 51 TC 72 Z9 73 U1 1 U2 19 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD MAR 30 PY 2001 VL 186 IS 2 BP 269 EP 281 DI 10.1016/S0012-821X(01)00236-9 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 419VB UT WOS:000167968500011 ER PT J AU Thuresson, ED Malkowski, MG Lakkides, KM Rieke, CJ Mulichak, AM Ginell, SL Garavito, RM Smith, WL AF Thuresson, ED Malkowski, MG Lakkides, KM Rieke, CJ Mulichak, AM Ginell, SL Garavito, RM Smith, WL TI Mutational and X-ray crystallographic analysis of the interaction of dihomo-gamma-linolenic acid with prostaglandin endoperoxide H syntheses SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID CYCLOOXYGENASE ACTIVE-SITE; ARACHIDONIC-ACID; ENDOTHELIAL-CELLS; MAJOR METABOLITES; CRYSTAL-STRUCTURE; H-2 SYNTHASE; FISH OIL; BINDING; INHIBITORS; BIOSYNTHESIS AB Prostaglandin endoperoxide H synthases-1 and -2 (PGHSs) catalyze the committed step in prostaglandin biosynthesis, Both isozymes can oxygenate a variety of related polyunsaturated fatty acids. We report here the x-ray crystal structure of dihomo-gamma -linolenic acid (DHLA) in the cyclooxygenase site of PGHS-1 and the effects of active site substitutions on the oxygenation of DHLA, and we compare these results to those obtained previously with arachidonic acid (AA), DHLA is bound within the cyclooxygenase site in the same overall L-shaped conformation as Ak C-1 and C-11 through C-20 are in the same positions for both substrates, but the positions of C-2 through C-10 differ by up to 1.74 Angstrom In general, substitutions of active site residues caused parallel changes in the oxygenation of both AA and DHLA. Two significant exceptions were Val-349 and Ser-530, A V349A substitution caused an 800-fold decrease in the V-max/K-m for DHLA but less than a a-fold change with AA; kinetic evidence indicates that C-13 of DHLA is improperly positioned with respect to Tyr-385 in the V349A mutant thereby preventing efficient hydrogen abstraction. Val-349 contacts C-5 of DHLA and appears to serve as a structural bumper positioning the carboxyl half of DHLA, which, in turn, positions properly the omega -half of this substrate, A V349A substitution in PGHS-2 has similar, minor effects on the rates of oxygenation of AA and DHLA. Thus, Val-349 is a major determinant of substrate specificity for PGHS-1 but not for PGHS-2. Ser-530 also influences the substrate specificity of PGHS-1; an S530T substitution causes 40- and 760-fold decreases in oxygenation efficiencies for AA and DHLA respectively. C1 Michigan State Univ, Dept Biochem & Mol Biol, E Lansing, MI 48824 USA. Argonne Natl Lab, Struct Biol Ctr, Argonne, IL 60439 USA. RP Smith, WL (reprint author), Michigan State Univ, Dept Biochem & Mol Biol, 513 Biochem Bldg, E Lansing, MI 48824 USA. RI Malkowski, Michael/G-4939-2011 OI Malkowski, Michael/0000-0003-1025-0014 FU NHLBI NIH HHS [F32 HL10170-01, R01 HL56773]; NIGMS NIH HHS [P01 GM57323] NR 57 TC 37 Z9 38 U1 0 U2 2 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 30 PY 2001 VL 276 IS 13 BP 10358 EP 10365 DI 10.1074/jbc.M009378200 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 420GC UT WOS:000167996400102 PM 11121413 ER PT J AU Hall, BL Lachmar, TE Dupont, RR AF Hall, BL Lachmar, TE Dupont, RR TI Field monitoring and performance evaluation of a field-scale in-well aeration system at a gasoline-contaminated site SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article DE groundwater; contamination; monitoring; remediation ID UNCONFINED AQUIFERS; GROUNDWATER AB Several in-well aeration (IWA) technologies have been used since the early 1990s, but few field studies have been performed to evaluate the extent of water circulation around IWA systems. In this study, 27 discrete monitoring points (MPs) were installed at a gasoline-contaminated site to assess the efficacy of IWA. Pressure transducers and dissolved oxygen (DO) probes were sealed into the MPs, allowing them to be used to characterize subsurface changes in total head and DO with depth, distance and orientation from a central injection well. No change in DO or in hydrocarbon total mass or distribution occurred across the site during two trials (41 and 20 days) of the system. Water level fluctuations during the trials were similar in all MPs, and were due to seasonal water table changes and rainfall events. No circulation cell was established around the IWA well after 41 days of operation, and the impact of the well extended less than 90 cm from it. Groundwater only circulated through the sand pack around the well. Little, if any, recharge occurred through the lower screen. Silt accumulated in the well, limiting its operation time, even with a fabric filter sock over the lower screen, Obviously, IWA was ineffective at this site, probably because the horizontal hydraulic conductivity (Kh) of the soil opposite the lower screen was low (0.09 cm per day) and because the distance between the two screens was short relative to the borehole radius. Long remediation times would likely make IWA unattractive at this or other sites where the Kh of the soil is so low that the air injection rate would have to be low to prevent blowing the well dry. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Utah State Univ, Dept Geol, Logan, UT 84322 USA. Utah State Univ, Utah Water Res Lab, Logan, UT 84322 USA. RP Hall, BL (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. NR 28 TC 8 Z9 12 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD MAR 30 PY 2001 VL 82 IS 2 BP 197 EP 212 DI 10.1016/S0304-3894(00)00365-4 PG 16 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 409HH UT WOS:000167378000006 PM 11230915 ER PT J AU Kim, CH Tinoco, I AF Kim, CH Tinoco, I TI Structural and thermodynamic studies on mutant RNA motifs that impair the specificity between a viral replicase and its promoter SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE NMR; brome mosaic virus; triloop; RNA replication; clamped adenine motif ID BROME MOSAIC-VIRUS; SECONDARY STRUCTURES; NMR-SPECTROSCOPY; POLYMERASE; HAIRPINS; COMPLEX AB The 3'-end region of the genomic RNA of brome mosaic virus forms a tRNA-like structure that is critical for its replication. Previous studies have shown that in this region, a stem-loop structure, called SLC, is necessary and sufficient for the binding of the RNA replicase, and for RNA replication. Recently, we determined the high-resolution NMR structure of SLC, which demonstrated that a 5'-AUA-3' triloop region is an important structural element for the enzymatic recognition. We proposed that the 5'-adenine of the triloop, which is rigidly fixed ("clamped") to the stem, is a key recognition element for the replicase. To elucidate the role of this "clamped base motii" for the enzymatic recognition, we have now investigated the solution conformations of several stem-loop molecules with mutant triloops, 5'-UUA-3', 5'-GUA-3', 5'-CUA-3' and 5'-UUU-3', that destroy the enzymatic recognition. For the GUA and UUA mutants, we have obtained high-resolution solution structures using 2D NMR. All four mutants have very similar thermodynamic stabilities, and all have the same secondary structures, a triloop with a five base-paired stem helix. In addition, they have quite similar sugar puckering patterns in the triloop region. The NMR structures of the GUA and UUA show that the 5' nucleotide of the triloop (G6 in GUA or U6 in UUA) lacks the strong interactions that hold its base in a fixed position. In particular, the U6 of UUA is found in two different conformations. Neither of these two mutants has the clamped base motif that was observed in the wild-type. While UUA also shows global change in the overall triloop conformation, GUA shows a very similar triloop conformation to the wild-type except for the lack of this motif. The absence of the clamped base motif is the only common structural difference between these two mutants and the wild-type. These results clearly indicate that the loss of function of the UUA and GUA mutants comes mainly from the destruction of a small key recognition motif rather than from global changes in their triloop conformations. Based on this study, we conclude that the key structural motif in the triloop recognized by the replicase is a solution-exposed, 5'-adenine base in the triloop that is clamped to the stem helix, which is called a clamped adenine motif. (C) 2001 Academic Press. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Tinoco, I (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. FU NIGMS NIH HHS [GM10840] NR 33 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAR 30 PY 2001 VL 307 IS 3 BP 827 EP 839 DI 10.1006/jmbi.2001.4497 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 419BW UT WOS:000167930300008 PM 11273704 ER PT J AU Demange, V Anderegg, JW Ghanbaja, J Machizaud, F Sordelet, DJ Besser, M Thiel, PA Dubois, JM AF Demange, V Anderegg, JW Ghanbaja, J Machizaud, F Sordelet, DJ Besser, M Thiel, PA Dubois, JM TI Surface oxidation of Al-Cr-Fe alloys characterized by X-ray photoelectron spectroscopy SO APPLIED SURFACE SCIENCE LA English DT Article DE approximants of decagonal phase; X-ray photoelectron spectroscopy; transmission electron microscopy; oxidation ID QUASI-CRYSTALLINE COATINGS; APPROXIMANTS; PHASES; AL65CU20CR15 AB We present X-ray photoelectron spectroscopy (XPS) measurements of several Al-Cr-Fe samples which are mixtures of approximants of the decagonal phase. Some samples also contain a hexagonal gamma -brass phase. Our purpose is to evaluate the effect of chemical composition, particularly Cr content, on the response of the surface to oxidation. Under mild conditions only aluminium oxidizes, but under extreme conditions (water immersion at room temperature, or oxygen exposure at high temperatures), chromium oxidizes as well. XPS data also provide a measure of the oxide thickness. Cr has no discernible effect on oxide thickness when the oxidizing environment is the gas phase, but provides significant protection against water immersion, where high concentrations of Cr reduce the thickness by as much as 40%. These results for the Al-Cr-Fe samples are compared with results for approximants and quasicrystals in other systems. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA. UHP Nancy, Serv Commun Microscopie Elect Transmiss, F-54042 Nancy, France. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Ecole Mines, INPL CNRS UMR 7584, Lab Sci & Genie Mat Met, F-54042 Nancy, France. RP Thiel, PA (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. NR 29 TC 32 Z9 32 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAR 29 PY 2001 VL 173 IS 3-4 BP 327 EP 338 DI 10.1016/S0169-4332(01)00011-3 PG 12 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 411CD UT WOS:000167479800019 ER PT J AU Berrie, CL Longfellow, CA Suits, AG Lee, YT AF Berrie, CL Longfellow, CA Suits, AG Lee, YT TI Infrared multiphoton dissociation of acetone in a molecular beam SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID MULTI-PHOTON DISSOCIATION; VIBRATIONAL-STATE DISTRIBUTIONS; 3S RYDBERG STATE; 193 NM; PHOTODISSOCIATION DYNAMICS; STEPWISE DISSOCIATION; EMISSION-SPECTROSCOPY; ROTATIONAL-STATE; DIODE-LASER; AB-INITIO AB The infrared multiphoton dissociation of acetone has been studied for the first time under the collisionless conditions of a molecular beam. A single carbon-carbon bond rupture channel resulting in the formation of an acetyl radical and a methyl radical is the only primary channel observed. The translational energy distribution for this channel peaks near zero with an average translational energy release of only 2.0 kcal/mol as expected for a reaction with no exit barrier. Significant secondary decomposition of the acetyl radical to carbon monoxide and methyl radical is also observed. The translation energy distribution determined for this channel is peaked well away from zero with an average energy release of 6.1 kcal/mol indicating that it proceeds on a potential energy surface with a barrier, consistent with previous UV experiments. No molecular elimination pathways are observed under the conditions of these experiments. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Berrie, CL (reprint author), Univ Kansas, Dept Chem, Lawrence, KS 66045 USA. NR 44 TC 9 Z9 9 U1 0 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 29 PY 2001 VL 105 IS 12 BP 2557 EP 2562 DI 10.1021/jp003620v PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 416ED UT WOS:000167766600010 ER PT J AU Gray, SK Goldfield, EM AF Gray, SK Goldfield, EM TI Highly excited bound and low-lying resonance states of H2O SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID VIBRATIONAL-ENERGY LEVELS; RECURSION POLYNOMIAL EXPANSION; FILTER-DIAGONALIZATION; TRIATOMIC-MOLECULES; REACTIVE SCATTERING; QUANTUM-MECHANICS; GREENS-FUNCTION; DYNAMICS; WATER; MODEL AB A theoretical study of the highest bound states and some of the lowest energy resonance states of water in its ground electronic state, (X) over tilde = 1(1)A ', and with zero total angular momentum, is presented. The majority of our calculations correspond to the even symmetry block with respect to hydrogen atom exchange. An accurate ab initio based potential surface is employed. The Lanczos method, applied to a large grid representation of the Hamiltonian, is shown to be a straightforward method for obtaining the bound state energy levels. Selected eigenfunctions are also determined and several of those near the dissociation threshold are quite extended. Resonance states just above the dissociation threshold are characterized with the aid of damped Chebyshev iterations. Among the resonances observed are those with hyperspherical and local mode character. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Wayne State Univ, Dept Chem, Detroit, MI 48202 USA. RP Gray, SK (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 38 TC 26 Z9 26 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 29 PY 2001 VL 105 IS 12 BP 2634 EP 2641 DI 10.1021/jp003821z PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 416ED UT WOS:000167766600021 ER PT J AU Wang, LW AF Wang, LW TI Calculating the influence of external charges on the photoluminescence of a CdSe quantum dot SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID SEMICONDUCTOR NANOCRYSTALS; FLUORESCENCE INTERMITTENCY; TRANSITIONS; BLINKING; BEHAVIOR AB The influence of external charges on the radiative recombination rate of an electron-hole pair in a CdSe quantum dot is investigated via atomistic empirical pseudopotential calculations. It is found that, when a negative external charge is near the surface of a CdSe quantum dot, its Coulomb potential could be strong enough to pull the hole away from the electron and results in a reduction of the radiative recombination rate by a factor of 70. Distance, direction, charge number, and charge type dependences of this effect are investigated. C1 Lawrence Berkeley Natl Lab, NERSC, Berkeley, CA 94720 USA. RP Wang, LW (reprint author), Lawrence Berkeley Natl Lab, NERSC, Berkeley, CA 94720 USA. NR 22 TC 56 Z9 56 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 29 PY 2001 VL 105 IS 12 BP 2360 EP 2364 PG 5 WC Chemistry, Physical SC Chemistry GA 416CW UT WOS:000167763400017 ER PT J AU Gan, S Liang, Y Baer, DR Sievers, MR Herman, GS Peden, CHF AF Gan, S Liang, Y Baer, DR Sievers, MR Herman, GS Peden, CHF TI Effect of platinum nanocluster size and titania surface structure upon CO surface chemistry on platinum-supported TiO2 (110) SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; TIO2(110); ADSORPTION; FILMS; SITE; CHEMISORPTION; GROWTH; MODEL AB The adsorption chemistry of CO on clean and Pt-supported TiO2 (110) was investigated. It was found that surface structure of TiO2 plays an important role in the chemistry that takes place at the surface. On the reduced (1 x 2)-reconstructed surface, CO desorbed at 140 and 170 K, while only desorption at 140 K was observed on the stoichiometric (1 x 1) surface. Additionally, CO dissociation, possibly due to the reduction by Ti3+, was observed on the Pt-supported (1 x 2) surface. On the Pt-covered surfaces, the chemistry of CO adsorption and desorption strongly depends on the size of Pt nanoclusters. With a decrease in cluster size, CO was found to desorb at higher temperatures. This unusual desorption chemistry is likely related to quantum size effects of Pt nanoclusters. Scanning tunneling spectra revealed that clusters below 20 Angstrom in diameter exhibited nonmetallic behavior, while those above 40 Angstrom were metallic. This transition of the properties of Pt nanoclusters from metallic to nonmetallic as the cluster size decreases correlates with stronger interaction of CO with Pt observed in temperature-programmed desorption spectra. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Liang, Y (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RI Baer, Donald/J-6191-2013; OI Baer, Donald/0000-0003-0875-5961; Peden, Charles/0000-0001-6754-9928 NR 29 TC 48 Z9 48 U1 0 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 29 PY 2001 VL 105 IS 12 BP 2412 EP 2416 DI 10.1021/jp003125z PG 5 WC Chemistry, Physical SC Chemistry GA 416CW UT WOS:000167763400024 ER PT J AU Curtis, RA Blanch, HW Prausnitz, JM AF Curtis, RA Blanch, HW Prausnitz, JM TI Calculation of phase diagrams for aqueous protein solutions SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID 2ND VIRIAL-COEFFICIENT; GLOBULAR-PROTEINS; BEHAVIOR; CRYSTALLIZATION; FLUIDS; MODEL AB In recent publications, phase diagrams have been generated from simple models of globular proteins interacting via anisotropic interactions. In these models, protein solubility is determined from the favorable energetic interactions due to the formation of protein-protein contacts in the crystal that overcome the unfavorable loss in entropy from constraining a protein molecule upon crystallization. In this work, we develop a statistical mechanical description for protein crystallization of which a key component is the quantitative calculation of this entropy loss. We calculate the entropic term from experimental crystallographic data for lysozyme and show that the empirical correlation of the osmotic second virial coefficient with lysozyme solubility corresponds to 6-8 contacts per protein molecule in the crystal. In addition, our model predicts that the two-body potential of mean force between lysozyme molecules is highly anisotropic. This has important implications for determining the position of a fluid-fluid critical point metastable to the fluid-solid equilibrium. That position is important because, as shown previously, crystallization kinetics are maximized at temperatures slightly exceeding the fluid-fluid critical temperature. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Prausnitz, JM (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. NR 23 TC 54 Z9 54 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 29 PY 2001 VL 105 IS 12 BP 2445 EP 2452 DI 10.1021/jp003087j PG 8 WC Chemistry, Physical SC Chemistry GA 416CW UT WOS:000167763400029 ER PT J AU Rainwater, D AF Rainwater, D TI New method for extracting the bottom quark Yukawa coupling at the CERN Large Hadron Collider SO PHYSICS LETTERS B LA English DT Article ID MSSM HIGGS BOSONS; LHC; EVENTS; GAMMA AB We propose a new method for measuring the H --> b (b) over bar rate at the CERN Large Hadron Collider in a manner which would allow extraction of the b quark Yukawa coupling. Higgs boson production in purely electroweak W H jj events is calculated. The Standard Model signal rate including decays W --> lv and H --> b (b) over bar is 11 fb for M-H = 120 GeV. It is possible to suppress the principal backgrounds, Wb (b) over bar jj and t (t) over bar jj, to approximately the level of the signal. As the top quark Yukawa couplings does not appear in this process, it promises a reliable extraction of g(Hbb) in the context of the Standard Model or some extensions, such as the MSSM. (C) 2001 Published by Elsevier Science B.V. C1 Fermilab, Dept Theoret Phys, Batavia, IL 60510 USA. RP Rainwater, D (reprint author), Fermilab, Dept Theoret Phys, POB 500, Batavia, IL 60510 USA. OI rainwater, david/0000-0002-3668-4331 NR 30 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 29 PY 2001 VL 503 IS 3-4 BP 320 EP 324 DI 10.1016/S0370-2693(01)00229-5 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 417CG UT WOS:000167817400012 ER PT J AU Green, MA Teubner, PJO Brunger, MJ Cartwright, DC Campbell, L AF Green, MA Teubner, PJO Brunger, MJ Cartwright, DC Campbell, L TI Integral cross sections for electron impact excitation of the Herzberg pseudocontinuum of molecular oxygen SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID GROUND-STATE; O2; SCATTERING; O-2; WATER AB We report integral cross sections (ICSs) for electron impact excitation of the sum (c (1)Sigma (-)(u) + A ' (3)Delta (u) + A (3)Sigma (+)(u)) Of the three states that constitute the Herzberg pseudocontinuum in O-2. These ICSs were measured at seven incident electron energies in-the range 9-20 eV in order to investigate for the existence of the strong resonance feature predicted by earlier R-matrix calculations. No such structure was observed in this letter. C1 Flinders Univ S Australia, Sch Chem Phys & Earth Sci, Adelaide, SA 5001, Australia. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Green, MA (reprint author), Flinders Univ S Australia, Sch Chem Phys & Earth Sci, GPO Box 2100, Adelaide, SA 5001, Australia. RI Green, Michael/C-9634-2011; Green, Michael/F-7845-2012 NR 29 TC 9 Z9 9 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAR 28 PY 2001 VL 34 IS 6 BP L157 EP L162 DI 10.1088/0953-4075/34/6/102 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 422VP UT WOS:000168140200002 ER PT J AU Zhan, CG Zheng, F AF Zhan, CG Zheng, F TI First computational evidence for a catalytic bridging hydroxide ion in a phosphodiesterase active site SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CYCLIC-AMP PHOSPHODIESTERASE; LIVER PLASMA-MEMBRANES; CARBOXYLIC-ACID ESTERS; REACTION FIELD-THEORY; ALKALINE-HYDROLYSIS; ENERGY BARRIERS; PURIFICATION; INHIBITORS; SOLVATION; PDE4 AB Phosphodiesterases are clinical targets for a variety of biological disorders, because this superfamily of enzymes regulates the intracellular concentration of cyclic nucleotides that serve as the second messengers playing a critical role in a variety of physiological processes. Understanding the structure and mechanism of a phosphodiesterase will provide a solid basis for rational design of the more efficient therapeutics. Although a three-dimensional X-ray crystal structure of the catalytic domain of human phosphodiesterase 4B2B was recently reported, it is uncertain whether a critical bridging ligand in the active site is a water molecule or a hydroxide ion. The identity of this bridging ligand is theoretically determined by performing first-principles quantum chemical calculations on models of the active site. All the results obtained indicate that this critical bridging ligand in the active site of the reported X-ray crystal structure is a hydroxide ion, rather than a water molecule, expected to serve as the nucleophile to initialize the catalytic degradation of the intracellular second messengers. C1 Cent China Normal Univ, Dept Chem, Wuhan 430070, Peoples R China. Columbia Univ Coll Phys & Surg, Dept Med, New York, NY 10032 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Zhan, CG (reprint author), Cent China Normal Univ, Dept Chem, Wuhan 430070, Peoples R China. NR 24 TC 55 Z9 58 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 28 PY 2001 VL 123 IS 12 BP 2835 EP 2838 DI 10.1021/ja005529a PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA 416QV UT WOS:000167792400016 PM 11456970 ER PT J AU Arikati, SR Dessmark, A Lingas, A Marathe, MV AF Arikati, SR Dessmark, A Lingas, A Marathe, MV TI Approximation algorithms for maximum two-dimensional pattern matching SO THEORETICAL COMPUTER SCIENCE LA English DT Article DE pattern matching; NP-hardness; approximation algorithm ID TREE-WIDTH; PACKING; GRAPHS AB We introduce the following optimization version of the classical pattern matching problem (referred to as the maximum pattern matching problem). Given a two-dimensional rectangular text and a two-dimensional rectangular pattern, find the maximum number of non-overlapping occurrences of the pattern in the text. Unlike the classical two-dimensional pattern matching problem, the maximum two-dimensional pattern matching problem is NP-complete. We devise polynomial time approximation algorithms and approximation schemes for this problem. We also briefly discuss how the approximation algorithms can be extended to include a number of other variants of the problem. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Lund Univ, Dept Comp Sci, S-22100 Lund, Sweden. Univ Memphis, Dept Math Sci, Memphis, TN 38152 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Max Planck Inst Informat, Saarbrucken, Germany. RP Lund Univ, Dept Comp Sci, Box 117, S-22100 Lund, Sweden. EM arikati@cadence.com; Anders.Dessmark@dna.lth.se; Andrzej.Lingas@dna.lth.se; madhav@c3.lanl.gov NR 29 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3975 EI 1879-2294 J9 THEOR COMPUT SCI JI Theor. Comput. Sci. PD MAR 28 PY 2001 VL 255 IS 1-2 BP 51 EP 62 PG 12 WC Computer Science, Theory & Methods SC Computer Science GA 416QR UT WOS:000167792100003 ER PT J AU Fischer, PF Preparata, FP Savage, JE AF Fischer, PF Preparata, FP Savage, JE TI Generalized scans and tridiagonal systems SO THEORETICAL COMPUTER SCIENCE LA English DT Article DE parallel computation; prefix; scan; numerical computation; tridiagonal linear system ID CYCLIC REDUCTION ALGORITHM; PARALLEL; EQUATIONS AB Motivated by the analysis of known parallel techniques for the solution of linear tridiagonal system, we introduce generalized scans, a class of recursively defined length-preserving, sequence-to-sequence transformations that generalize the well-known prefix computations (scans). Generalized scan functions are described in terms of three algorithmic phases, the reduction phase that saves data for the third of expansion phase and prepares data for the second phase which is a recursive invocation of the same function on one fewer variable. Both the reduction and expansion phases operate on bounded number of variables, a key feature for their parallelization. Generalized scans enjoy a property, called here protoassociativity, that gives rise to ordinary associativity when generalized scans are specialized to ordinary scans. We show that the solution of positive-definite block tridiagonal linear systems can be cast as a generalized scan, thereby shedding light on the underlying structure enabling known parallelization schemes for this problem. We also describe a variety of parallel algorithms including some that are well known for tridiagonal systems and some that are much better suited to distributed computation. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brown Univ, Dept Comp Sci, Providence, RI 02912 USA. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Savage, JE (reprint author), Brown Univ, Dept Comp Sci, POB 1910, Providence, RI 02912 USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3975 J9 THEOR COMPUT SCI JI Theor. Comput. Sci. PD MAR 28 PY 2001 VL 255 IS 1-2 BP 423 EP 436 PG 14 WC Computer Science, Theory & Methods SC Computer Science GA 416QR UT WOS:000167792100021 ER PT J AU Ghan, SJ Easter, RC Chapman, EG Abdul-Razzak, H Zhang, Y Leung, LR Laulainen, NS Saylor, RD Zaveri, RA AF Ghan, SJ Easter, RC Chapman, EG Abdul-Razzak, H Zhang, Y Leung, LR Laulainen, NS Saylor, RD Zaveri, RA TI A physically based estimate of radiative forcing by anthropogenic sulfate aerosol SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article; Proceedings Paper CT 2nd AGU Chapman Conference on Water Vapor in the Climate System CY OCT 12-15, 1999 CL POTOMAC, MARYLAND SP Amer Geophysic Union ID GENERAL-CIRCULATION MODEL; TROPOSPHERIC SULFUR CYCLE; SUBGRID SCALE VARIATIONS; COMMUNITY CLIMATE MODEL; RELATIVE-HUMIDITY; CLOUD MICROPHYSICS; EFFECTIVE-RADIUS; SEA-SALT; SENSITIVITY; SIMULATION AB Estimates of direct and indirect radiative forcing by anthropogenic sulfate aerosols from an integrated global aerosol and climate modeling system are presented. A detailed global tropospheric chemistry and aerosol model that predicts concentrations of oxidants as well as aerosols and aerosol precursors, is coupled to a general circulation model that predicts both cloud water mass and cloud droplet number. Both number and mass of several externally mixed aerosol size modes are predicted, with internal mixing assumed for the different aerosol components within each mode. Predicted aerosol species include sulfate, organic and black carbon, soil dust, and sea salt. The models use physically based treatments of aerosol radiative properties (including dependence on relative humidity) and aerosol activation as cloud condensation nuclei. Parallel simulations with and without anthropogenic sulfate aerosol are performed for a global domain. The global and annual mean direct and indirect radiative forcing due to anthropogenic sulfate are estimated to be -0.3 to -0.5 and -1.5 to -3.0 W m(2), respectively. The radiative forcing is sensitive to the model's horizontal resolution, the use of predicted versus analyzed relative humidity, the prediction versus diagnosis of aerosol number and droplet number, and the parameterization of droplet collision/coalescence. About half of the indirect radiative forcing is due to changes in droplet radius and half to increased cloud liquid water. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Texas A&I Univ, Kingsville, TX 78363 USA. Atmospher & Environm Res, San Ramon, CA 94583 USA. Georgia Inst Technol, Atlanta, GA 30332 USA. RP Ghan, SJ (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. RI Chapman, Elaine/K-8756-2012; Saylor, Rick/D-1252-2014; Ghan, Steven/H-4301-2011; OI Saylor, Rick/0000-0003-4835-8290; Ghan, Steven/0000-0001-8355-8699; Zaveri, Rahul/0000-0001-9874-8807 NR 47 TC 98 Z9 102 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0747-7309 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 27 PY 2001 VL 106 IS D6 BP 5279 EP 5293 DI 10.1029/2000JD900503 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 413XB UT WOS:000167635900014 ER PT J AU Ghan, S Laulainen, N Easter, R Wagener, R Nemesure, S Chapman, E Zhang, Y Leung, R AF Ghan, S Laulainen, N Easter, R Wagener, R Nemesure, S Chapman, E Zhang, Y Leung, R TI Evaluation of aerosol direct radiative forcing in MIRAGE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article; Proceedings Paper CT 2nd AGU Chapman Conference on Water Vapor in the Climate System CY OCT 12-15, 1999 CL POTOMAC, MARYLAND SP Amer Geophysic Union ID SUBGRID SCALE VARIATIONS; MID-ATLANTIC COAST; OPTICAL-PROPERTIES; UNITED-STATES; TROPOSPHERIC AEROSOLS; ATMOSPHERIC AEROSOLS; RELATIVE-HUMIDITY; LIGHT-ABSORPTION; SULFATE AEROSOL; SCATTERING AB A variety of measurements have been used to evaluate the treatment of aerosol radiative properties and radiative impacts of aerosols simulated by the Model for Integrated Research on Atmospheric Global Exchange (MIRAGE). The treatment of water uptake in MIRAGE agrees with laboratory measurements, and the growth of aerosol extinction with relative humidity in MIRAGE simulations agrees with field measurements. The simulated frequency of relative humidity near 100% is about twice that of analyzed relative humidity. When the analyzed relative humidity is used to calculate aerosol water uptake in MIRAGE, the simulated aerosol optical depth agrees with most surface measurements after cloudy conditions are filtered out and differences between model and station elevations are accounted for, but simulated optical depths are too low over Brazil and central Canada. Simulated optical depths are mostly within a factor of 2 of satellite estimates, but are too high off the east coasts of the United States and China and too low off the coast of West Africa and in the Arabian Sea. The simulated single-scatter albedo is consistent with surface measurements. MIRAGE correctly simulates a larger Angstrom exponent near regions with emissions of submicron particles and aerosol precursor gases, and a smaller exponent near regions with emissions of coarse particles. The simulated sensitivity of radiative forcing to aerosol optical depth is consistent with estimates from measurements. The simulated direct forcing is within the uncertainty of estimates from measurements in the North Atlantic. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Atmospher & Environm Res, San Ramon, CA 94583 USA. RP Ghan, S (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. RI Wagener, Richard/B-5445-2008; Chapman, Elaine/K-8756-2012; Ghan, Steven/H-4301-2011 OI Wagener, Richard/0000-0003-3892-1182; Ghan, Steven/0000-0001-8355-8699 NR 65 TC 105 Z9 108 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0747-7309 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 27 PY 2001 VL 106 IS D6 BP 5295 EP 5316 DI 10.1029/2000JD900502 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 413XB UT WOS:000167635900015 ER PT J AU Ghan, S Easter, R Hudson, J Breon, FM AF Ghan, S Easter, R Hudson, J Breon, FM TI Evaluation of aerosol indirect radiative forcing in MIRAGE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article; Proceedings Paper CT 2nd AGU Chapman Conference on Water Vapor in the Climate System CY OCT 12-15, 1999 CL POTOMAC, MARYLAND SP Amer Geophysic Union ID GENERAL-CIRCULATION MODEL; CLOUD CONDENSATION NUCLEI; DROPLET EFFECTIVE RADIUS; COMMUNITY CLIMATE MODEL; ANTHROPOGENIC AEROSOLS; SULFATE AEROSOLS; BOUNDARY-LAYER; LIQUID WATER; NUMERICAL-SIMULATION; SOUTHERN-OCEAN AB We evaluate aerosol indirect radiative forcing simulated by the Model for Integrated Research on Atmospheric Global Exchange(MIRAGE). Although explicit measurements of aerosol indirect radiative forcing do not exist, measurements of many of the links between aerosols and indirect radiative forcing are available and can be used for evaluation. These links include the cloud condensation nuclei concentration, the ratio of droplet number to aerosol number, the droplet number concentration, the column droplet number, the column cloud water, the;droplet effective radius, the cloud optical depth, the correlation between cloud albedo and droplet effective radius, and the cloud radiative forcing. The CCN concentration simulated by MIRAGE agrees with measurements for supersaturations larger than 0.1% but not for smaller supersaturations. Simulated droplet number concentrations are too low in most but not all locations with available measurements, even when normalized by aerosol number. MIRAGE correctly simulates the higher droplet numbers and smaller droplet sizes over continents and in the Northern Hemisphere. Biases in column cloud water, cloud optical depth, and shortwave cloud radiative forcing are evident in the Intertropical Convergence Zone and in the subtropical oceans. MIRAGE correctly simulates a negative correlation between cloud albedo and droplet size over remote oceans for cloud optical depths greater than 15 and a positive correlation for cloud optical depths less than 15 but fails to simulate a negative correlation over land. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Nevada, Desert Res Inst, Reno, NV 89506 USA. CEA, Lab Sci Climat & Environm, Gif Sur Yvette, France. RP Ghan, S (reprint author), Pacific NW Natl Lab, POB 999,MSIN K9-30, Richland, WA 99352 USA. RI Ghan, Steven/H-4301-2011; Breon, Francois-Marie/M-4639-2016 OI Ghan, Steven/0000-0001-8355-8699; Breon, Francois-Marie/0000-0003-2128-739X NR 64 TC 71 Z9 72 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0747-7309 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 27 PY 2001 VL 106 IS D6 BP 5317 EP 5334 DI 10.1029/2000JD900501 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 413XB UT WOS:000167635900016 ER PT J AU Jarzynski, C AF Jarzynski, C TI How does a system respond when driven away from thermal equilibrium? SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Editorial Material ID FREE-ENERGY DIFFERENCES; STEADY-STATES; EQUALITY C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Jarzynski, C (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Jarzynski, Christopher/B-4490-2009 OI Jarzynski, Christopher/0000-0002-3464-2920 NR 12 TC 32 Z9 32 U1 0 U2 11 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD MAR 27 PY 2001 VL 98 IS 7 BP 3636 EP 3638 DI 10.1073/pnas.081074598 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 417KG UT WOS:000167833700005 PM 11274379 ER PT J AU Zheng, MX Wu, M Tinoci, I AF Zheng, MX Wu, M Tinoci, I TI Formation of a GNRA tetraloop in P5abc can disrupt an interdomain interaction in the Tetrahymena group I ribozyme SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID T7 RNA-POLYMERASE; SECONDARY STRUCTURE; NMR; TERTIARY; CORE; SENSITIVITY; MOLECULE; SPECTRA; DOMAIN; LOOP AB The secondary structure of a truncated P5abc subdomain (tP5abc, a 56-nucleotide RNA) of the Tetrahymena thermophila group I intron ribozyme changes when its tertiary structure forms. We have now used heteronuclear NMR spectroscopy to determine its conformation in solution. The tP5abc RNA that contains only secondary structure is extended compared with the tertiary folded form; both forms coexist in slow chemical exchange (the interconversion rate constant is slower than 1 s(-1)) in the presence of magnesium. Kinetic experiments have shown that tertiary folding of the P5abc subdomain is one of the earliest folding transitions in the group I intron ribozyme, and that it leads to a metastable misfolded intermediate. Previous mutagenesis studies suggest that formation of the extended P5abc structure described here destabilize a misfolded intermediate. This study shows that the P5abc RNA subdomain containing a GNRA tetraloop in P5c tin contrast to the five-nucleotide loop P5c in the tertiary folded ribozyme) can disrupt the base-paired interdomain (P14) interaction between P5c and P2. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Tinoci, I (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. FU NIGMS NIH HHS [R01 GM010840, GM 10840, R37 GM010840] NR 37 TC 24 Z9 25 U1 2 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 MAR 27 PY 2001 VL 98 IS 7 BP 3695 EP 3700 DI 10.1073/pnas.051608598 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 417KG UT WOS:000167833700017 PM 11274387 ER PT J AU Marchetti, F Bishop, JB Lowe, X Generoso, WM Hozier, J Wyrobek, AJ AF Marchetti, F Bishop, JB Lowe, X Generoso, WM Hozier, J Wyrobek, AJ TI Etoposide induces heritable chromosomal aberrations and aneuploidy during male meiosis in the mouse SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID II INHIBITOR ETOPOSIDE; DNA TOPOISOMERASE-II; CHEMICAL-INDUCED ANEUPLOIDY; IN-SITU HYBRIDIZATION; MALE GERM-CELLS; CLEAVABLE COMPLEX; MALE-MICE; INDUCTION; MUTAGENICITY; CHEMOTHERAPY AB Etoposide, a topoisomerase II inhibitor widely used in cancer therapy, is suspected of inducing secondary tumors and affecting the genetic constitution of germ cells. A better understanding of the potential heritable risk of etoposide is needed to provide sound genetic counseling to cancer patients treated with this drug in their reproductive years. We used a mouse model to investigate the effects of clinical doses of etoposide on the induction of chromosomal abnormalities in spermatocytes and their transmission to zygotes by using a combination of chromosome painting and 4 ' ,6-diamidino-2-phenylindole staining. High frequencies of chromosomal aberrations were detected in spermatocytes within 64 h after treatment when over 30% of the metaphases analyzed had structural aberrations (P < 0.01), Significant increases in the percentages of zygotic metaphases with structural aberrations were found only for matings that sampled treated pachytene (28-fold, P < 0.0001) and preleptotene spermatocytes (13-fold, P < 0.001). Etoposide induced mostly acentric fragments and deletions, types of aberrations expected to result in embryonic lethality, because they represent loss of genetic material. Chromosomal exchanges were rare. Etoposide treatment of pachytene cells induced aneuploidy in both spermatocytes (18-fold, P < 0.01) and zygotes (8-fold, P < 0.05). We know of no other report of an agent for which paternal exposure leads to an increased incidence of aneuploidy in the offspring. Thus, we found that therapeutic doses of etoposide affect primarily meiotic germ cells, producing unstable structural aberrations and aneuploidy, effects that are transmitted to the progeny. This finding suggests that individuals who undergo chemotherapy with etoposide may be at a higher risk for abnormal reproductive outcomes especially within the 2 months after chemotherapy. C1 Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94550 USA. NIEHS, Res Triangle Pk, NC 27709 USA. Appl Genet Labs, Melbourne, FL 32901 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. RP Marchetti, F (reprint author), Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, POB 808,L-448, Livermore, CA 94550 USA. OI Marchetti, Francesco/0000-0002-9435-4867 FU NIEHS NIH HHS [N44ES72003, Y01-ES-10203-00] NR 49 TC 61 Z9 62 U1 0 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD MAR 27 PY 2001 VL 98 IS 7 BP 3952 EP 3957 DI 10.1073/pnas.061404598 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 417KG UT WOS:000167833700063 PM 11274416 ER PT J AU Kraabel, B Malko, A Hollingsworth, J Klimov, VI AF Kraabel, B Malko, A Hollingsworth, J Klimov, VI TI Ultrafast dynamic holography in nanocrystal solids SO APPLIED PHYSICS LETTERS LA English DT Article ID QUANTUM DOTS; SEMICONDUCTOR; POLYMERS AB We report efficient dynamic gratings in close-packed solids of CdSe nanocrystals. These gratings are formed on the subpicosecond time scale and have diffraction efficiencies up to 0.5% for film thicknesses of similar to0.5 mum. Nanocrystal solids combine the best features of inorganic semiconductors (large resonant nonlinearities and high photostability) and organic semiconducting polymers (chemical flexibility and tunability of optical properties by simple synthetic means). Additionally, nanocrystal solids allow precise control over the spectral position of the nonlinear optical response by simply varying the size of the nanocrystals used in fabricating the solid (quantum confinement effect). (C) 2001 American Institute of Physics. C1 Univ Calif Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. RP Klimov, VI (reprint author), Univ Calif Los Alamos Natl Lab, Div Chem, C-6,MS-J585, Los Alamos, NM 87545 USA. NR 13 TC 12 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 26 PY 2001 VL 78 IS 13 BP 1814 EP 1816 DI 10.1063/1.1358365 PG 3 WC Physics, Applied SC Physics GA 415VJ UT WOS:000167744000004 ER PT J AU Naftel, SJ Zhang, P Kim, PS Sham, TK Coulthard, I Antel, WJ Freeland, JW Frigo, SP Fung, MK Lee, ST Hu, YF Yates, BW AF Naftel, SJ Zhang, P Kim, PS Sham, TK Coulthard, I Antel, WJ Freeland, JW Frigo, SP Fung, MK Lee, ST Hu, YF Yates, BW TI Soft x-ray-excited luminescence and optical x-ray absorption fine structures of tris (8-hydroxyquinoline) aluminum SO APPLIED PHYSICS LETTERS LA English DT Article ID ORGANIC ELECTROLUMINESCENT DEVICES; POROUS SILICON; PHOTOEMISSION; SPECTROSCOPY; EXCITATION; BEAMLINE; SPECTRA; DIODES; XEOL AB Photoluminescence from tris (8-hydroxyquinoline) aluminum (Alq(3)) films has been observed using tunable soft x rays as an excitation source. The photons were tuned to energies above and below the K absorption edges of C, N, O, and Al. The luminescence was in turn used to monitor the absorption. It was found that the luminescence induced by soft x ray exhibits additional emission bands at shorter wavelengths compared to ultraviolet excitation. While all K edges exhibit optical x-ray absorption fine structures (XAFS) similar to those of total electron and fluorescence yield, the optical XAFS at the C K-edge resonance are enhanced for the C1s to pi* transitions, indicating site specificity. These observations are attributed to the energetics of the process and the local electronic structure. (C) 2001 American Institute of Physics. C1 Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. City Univ Hong Kong, Ctr Super Diamond & Adv Films, Hong Kong, Hong Kong, Peoples R China. City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China. Univ Wisconsin, Ctr Synchrotron Radiat, Canadian Synchrotron Radiat Facil, Stoughton, WI 53589 USA. RP Naftel, SJ (reprint author), Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada. RI Zhang, Peng/K-5174-2012 OI Zhang, Peng/0000-0003-3603-0175 NR 18 TC 14 Z9 14 U1 0 U2 9 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 26 PY 2001 VL 78 IS 13 BP 1847 EP 1849 DI 10.1063/1.1358360 PG 3 WC Physics, Applied SC Physics GA 415VJ UT WOS:000167744000015 ER PT J AU Ahrenkiel, RK Ellingson, R Metzger, W Lubyshev, DI Liu, WK AF Ahrenkiel, RK Ellingson, R Metzger, W Lubyshev, DI Liu, WK TI Auger recombination in heavily carbon-doped GaAs SO APPLIED PHYSICS LETTERS LA English DT Article ID HETEROJUNCTION BIPOLAR-TRANSISTORS; MINORITY-CARRIER LIFETIME; BEAM EPITAXY; SEMICONDUCTORS; BASE AB The recombination parameters in heavily carbon-doped GaAs are of considerable importance to current bipolar transistor technology. Here, we used time-resolved photoluminescence and quantum-efficiency techniques in parallel to measure the very short lifetimes expected at high doping. The samples were isotype double heterostructures, with the structure Al(0.4)Ga(0.6)As/GaAs/Al(0.4)Ga(0.6)As, grown by molecular-beam epitaxy. The doping level was varied from 5x10(18) to 1x10(20) cm(-3) for the samples described here. For doping levels greater than 1x10(19) cm(-3), the lifetime decreased as the inverse of the cube of the hole density, indicating that phonon and impurity-assisted Auger processes are dominant. (C) 2001 American Institute of Physics. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. IQE Inc, Bethlehem, PA 18015 USA. RP Ahrenkiel, RK (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Ellingson, Randy/H-3424-2013 NR 19 TC 9 Z9 9 U1 1 U2 7 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 26 PY 2001 VL 78 IS 13 BP 1879 EP 1881 DI 10.1063/1.1357213 PG 3 WC Physics, Applied SC Physics GA 415VJ UT WOS:000167744000026 ER PT J AU Bedson, TR Palmer, RE Jenkins, TE Hayton, DJ Wilcoxon, JP AF Bedson, TR Palmer, RE Jenkins, TE Hayton, DJ Wilcoxon, JP TI Quantitative evaluation of electron beam writing in passivated gold nanoclusters SO APPLIED PHYSICS LETTERS LA English DT Article ID CLUSTER STRUCTURES; LITHOGRAPHY; NANOSTRUCTURES; TRANSPORT; RESIST; FABRICATION; GRAPHITE; COLLOIDS AB We report a quantitative investigation of direct electron beam writing in monolayer films of passivated gold nanoclusters. In this process, the passivating organic ligands are (partially) removed to create gold-based nanostructures. We report the fabrication of lines with width as narrow as 26 nm, while measurements of the linewidth as a function of dose allow us to obtain a quantitative measure of the sensitivity, for comparison with established negative tone resists. (C) 2001 American Institute of Physics. C1 Univ Birmingham, Sch Phys & Astron, Nanoscale Phys Res Lab, Birmingham B15 2TT, W Midlands, England. Univ Wales, Dept Phys, Aberystwyth SY23 3BZ, Dyfed, Wales. Sandia Natl Labs, Nanostruct & Adv Mat Dept, Albuquerque, NM 87185 USA. RP Univ Birmingham, Sch Phys & Astron, Nanoscale Phys Res Lab, Birmingham B15 2TT, W Midlands, England. EM r.e.palmer@bham.ac.uk RI Palmer, Richard/A-5366-2008 OI Palmer, Richard/0000-0001-8728-8083 NR 20 TC 19 Z9 19 U1 0 U2 3 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 MAR 26 PY 2001 VL 78 IS 13 BP 1921 EP 1923 DI 10.1063/1.1354154 PG 3 WC Physics, Applied SC Physics GA 415VJ UT WOS:000167744000040 ER PT J AU Schneider, G Hambach, D Niemann, B Kaulich, B Susini, J Hoffmann, N Hasse, W AF Schneider, G Hambach, D Niemann, B Kaulich, B Susini, J Hoffmann, N Hasse, W TI In situ x-ray microscopic observation of the electromigration in passivated Cu interconnects SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRON-MICROSCOPY; TOMOGRAPHY; ELEMENTS; NICKEL AB X-ray imaging of electromigration in a passivated Cu interconnect was performed with 100-nm spatial resolution. A time sequence of 200 images, recorded with the European Synchrotron Radiation Facility x-ray microscope in 2.2 h at 4 keV photon energy, visualizes the mass flow of Cu at current densities up to 2x10(7) A/cm(2). Due to the high penetration power through matter and the element specific image contrast, x-ray microscopy is a unique tool for time-resolved, quantitative mass transport measurements in interconnects. Model calculations predict that failures in operating microprocessors are detectable with 30 nm resolution by nanotomography. (C) 2001 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA. Univ Gottingen, Inst Rontgenphys, D-37073 Gottingen, Germany. European Synchrotron Radiat Facil, F-38043 Grenoble, France. Univ Hannover, Inst Halbleitertechnol & Werkstoffe Elektrotech, D-30167 Hannover, Germany. RP Schneider, G (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Xray Opt, 1 Cyclotron Rd MS 2-400, Berkeley, CA 94720 USA. NR 15 TC 24 Z9 25 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 26 PY 2001 VL 78 IS 13 BP 1936 EP 1938 DI 10.1063/1.1356446 PG 3 WC Physics, Applied SC Physics GA 415VJ UT WOS:000167744000045 ER PT J AU Jackson, N AF Jackson, N TI Rallying support for continued research SO CHEMICAL & ENGINEERING NEWS LA English DT Article C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Jackson, N (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD MAR 26 PY 2001 VL 79 IS 13 BP 154 EP 154 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA 415JD UT WOS:000167717100093 ER PT J AU Satcher, JH Droege, MW Olmstead, MM Balch, AL AF Satcher, JH Droege, MW Olmstead, MM Balch, AL TI A mixed oxidation state, binuclear iron complex containing an unsymmetrically coordinating ligand. A ligand-induced switch in redox behavior SO INORGANIC CHEMISTRY LA English DT Article ID OXO PROTEINS; RIBONUCLEOTIDE REDUCTASE; HEMERYTHRIN; DIOXYGEN; CENTERS; PERSPECTIVE; ACTIVATION; MODELS; UNIT AB Binuclear [Fe(II)Fe(III)(BMDP)(O(2)CPh)(3)](BF(4)) (1) was obtained by treating an acetonitrile solution of the fully reduced Fe(II)Fe(II)(BMDP)(O(2)CPh)(MeOH)(1.5)(H(2)O)(0.5)](BF(4))(2) with 5 equiv of benzoate and then exposing the mixture to oxygen. Examination of [Fe(II)Fe(III)(BMDP)(O(2)CPh)(3)](BF(4)) by X-ray crystallography reveals the localized, mixed oxidation state nature of the cation in the solid state. (1)H NMR and magnetic susceptibility data for the new complex are also reported. In the absence of dioxygen and other oxidants, treatment of Fe(II)Fe(II)(BMDP)(O(2)CPh)-(MeOH)(1.5)(H(2)O)(0.5)](BF(4))(2) With excess benzoate results in the formation of [Fe(II)Fe(II)(BMDP)(O(2)CPh)(2)](BF(4))(2), which has also been characterized by X-ray diffraction. C1 Univ Calif Davis, Dept Chem, Davis, CA 95616 USA. Lawrence Livermore Natl Lab, Livermore, CA 95616 USA. RP Satcher, JH (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 95616 USA. NR 29 TC 16 Z9 16 U1 1 U2 4 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 MAR 26 PY 2001 VL 40 IS 7 BP 1454 EP 1458 DI 10.1021/ic9913177 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 413AT UT WOS:000167588300009 PM 11261950 ER PT J AU Bridgewater, JS Netzel, TL Schoonover, JR Massick, SM Ford, PC AF Bridgewater, JS Netzel, TL Schoonover, JR Massick, SM Ford, PC TI Time-resolved optical and infrared spectral studies of intermediates generated by photolysis of trans-RhCl(CO)PR3)(2). Roles played in the photocatalytic activation of hydrocarbons SO INORGANIC CHEMISTRY LA English DT Article ID C-H BONDS; SQUARE-PLANAR COMPLEXES; FLASH-PHOTOLYSIS; RHODIUM(I) COMPLEXES; REACTION DYNAMICS; METAL-COMPLEXES; PHOTOCHEMICAL CARBONYLATION; PHOSPHINE COMPLEXES; OXIDATIVE ADDITION; LOW-TEMPERATURE AB Described are picosecond and nanosecond time-resolved optical (TRO) spectral and nanosecond time-resolved infrared (TRIR) spectral studies of intermediates generated when the rhodium(I) complexes trans-RhCl(CO)L-2 (L = PPh3 (I), P(p-tolyl)(3) (II), or PMe3 (III) are subjected to photoexcitation. Each of these species, which are precursors in the photocatalytic activation of hydrocarbons, undergoes CO labilization to form an intermediate concluded to be the solvated complex RhCl(SoL)L-2 (A(i)). The picosecond studies demonstrate that an initial transient is formed promptly (<30 ps), which decays to Al with lifetimes ranging from 40 to 560 ps depending upon L and the medium. This is proposed on the basis of ab initio calculations to be a metal-to-ligand charge transfer (MLCT) excited state. Second-order rate constants (k(CO)) for reaction of the A(i) with CO were determined, and these depend on the nature of L and the solvent, the slowest rate being for Ar in tetrahydrofuran (k(CO) = 7.1 x 10(6) M-1 s(-1)), the fastest being for Am in dichloromethane (1.3 x 10(9) M-1 s(-1)). Each Ar also undergoes competitive unimolecular reaction with solvent to form long-lived transients with TRIR properties suggesting these to be Rh(III) products of oxidative addition. Although this was mostly suppressed by the presence of higher concentrations of CO (which trapped A(i) to re-form the starting complexes in each case), both TRO and TRIR experiments indicate that a fraction of the oxidative addition could not be quenched. Thus, the short-lived MLCT state or a vibrationally hot species formed during the decay of this excited state appears to participate directly in C-H activation. C1 Univ Calif Santa Barbara, Dept Chem, Santa Barbara, CA 93106 USA. Georgia State Univ, Dept Chem, Atlanta, GA 30303 USA. Los Alamos Natl Lab, Mat Sci & Technol Grp, Polymers & Coatings Grp, Los Alamos, NM 87545 USA. RP Ford, PC (reprint author), Univ Calif Santa Barbara, Dept Chem, Santa Barbara, CA 93106 USA. RI Ford, Peter/D-1826-2011 OI Ford, Peter/0000-0002-5509-9912 NR 62 TC 19 Z9 19 U1 2 U2 16 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 MAR 26 PY 2001 VL 40 IS 7 BP 1466 EP 1476 DI 10.1021/ic001298x PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 413AT UT WOS:000167588300011 PM 11261952 ER PT J AU Besmann, TM AF Besmann, TM TI Nuclear power & US SO NATION LA English DT Letter C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Besmann, TM (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATION CO INC PI NEW YORK PA 72 FIFTH AVE, NEW YORK, NY 10011 USA SN 0027-8378 J9 NATION JI Nation PD MAR 26 PY 2001 VL 272 IS 12 BP 2 EP 2 PG 1 WC Political Science SC Government & Law GA 413DM UT WOS:000167594700002 ER PT J AU Janssens, RVF AF Janssens, RVF TI Gammasphere at ATLAS: Physics at the limits SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 7th International Conference on Nucleus-Nucleus Collisions (NN2000) CY JUL 03-07, 2000 CL STRASBOURG, FRANCE ID SUPERHEAVY NUCLEI; FISSION; DEFORMATION; MECHANISM; NO-254; BAND AB The Gammasphere array of Compton-suppressed spectrometers has just completed a cycle of experiments at the ATLAS accelerator at Argonne National Laboratory. A majority of experiments studied the properties of nuclei at the very limits of stability in various regions of the periodic table. This contribution discusses through a few examples the major physics issues that have been investigated. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Janssens, RVF (reprint author), Argonne Natl Lab, Div Phys, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 35 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 26 PY 2001 VL 685 BP 209C EP 220C PG 12 WC Physics, Nuclear SC Physics GA 413TV UT WOS:000167618500018 ER PT J AU Paul, P AF Paul, P TI Commissioning of RHIC and its four detectors SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 7th International Conference on Nucleus-Nucleus Collisions (NN2000) CY JUL 03-07, 2000 CL STRASBOURG, FRANCE AB The first operation of the RHIC complex and the first detection of Au on Au collisions in all four detectors installed in the interaction regions are reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Paul, P (reprint author), Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 26 PY 2001 VL 685 BP 449C EP 453C PG 5 WC Physics, Nuclear SC Physics GA 413TV UT WOS:000167618500036 ER PT J AU Alonso, JR AF Alonso, JR TI Medical applications of nuclear physics and heavy-ion beams SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 7th International Conference on Nucleus-Nucleus Collisions (NN2000) CY JUL 03-07, 2000 CL STRASBOURG, FRANCE ID PROTON; IRRADIATION; THERAPY; SYSTEM AB Isotopes and accelerators, hallmarks of nuclear physics, are finding increasingly sophisticated and effective applications in the medical field. Diagnostic and therapeutic uses of radioisotopes are now a $10B/yr business worldwide, with over 10 million procedures and patient studies performed every year. This paper will discuss the use of isotopes for these applications. In addition, beams of protons and heavy ions are being more and more widely used clinically for treatment of malignancies. To be discussed here as well will be the rationale and techniques associated with charged-particle therapy, and the progress in implementation and optimization of these technologies for clinical use. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Alonso, JR (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 40 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 26 PY 2001 VL 685 BP 454C EP 471C PG 18 WC Physics, Nuclear SC Physics GA 413TV UT WOS:000167618500037 ER PT J AU Chaloupka, JL Lafon, R DiMauro, LF Agostini, P Kulander, KC AF Chaloupka, JL Lafon, R DiMauro, LF Agostini, P Kulander, KC TI Strong-field double ionization of rare gases SO OPTICS EXPRESS LA English DT Article ID NONSEQUENTIAL DOUBLE-IONIZATION; ABOVE-THRESHOLD IONIZATION; MULTIPHOTON IONIZATION; MOMENTUM DISTRIBUTIONS; TUNNELING LIMIT; HELIUM; IONS; ELECTRON; SINGLE; ATOMS AB We have studied the double ionization of helium and other rare gases using an electron-ion coincidence technique. With this scheme, the electron energy spectrum correlated to the creation of a doubly charged ion may be compiled. In all cases, the observed double ionization electron distributions are similar and enhanced at high energies, while the single ionization spectra exhibit distinct differences. (C) 2001 Optical Society of America. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Ctr Etud Saclay, SPAM, F-91191 Gif Sur Yvette, France. Univ Calif Lawrence Livermore Natl Lab, TAMP, Livermore, CA 94551 USA. RP Chaloupka, JL (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 22 TC 15 Z9 15 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1094-4087 J9 OPT EXPRESS JI Opt. Express PD MAR 26 PY 2001 VL 8 IS 7 BP 352 EP 357 PG 6 WC Optics SC Optics GA 415CR UT WOS:000167703400002 PM 19417827 ER PT J AU Weber, T Weckenbrock, M Staudte, A Hattass, M Spielberger, L Jagutzki, O Mergel, V Bocking, HS Urbasch, G Giessen, H Brauning, H Cocke, CL Prior, MH Dorner, R AF Weber, T Weckenbrock, M Staudte, A Hattass, M Spielberger, L Jagutzki, O Mergel, V Bocking, HS Urbasch, G Giessen, H Brauning, H Cocke, CL Prior, MH Dorner, R TI Atomic dynamics in single and multi-photon double ionization: An experimental comparison SO OPTICS EXPRESS LA English DT Article ID NONSEQUENTIAL DOUBLE-IONIZATION; DOUBLE PHOTOIONIZATION; MOMENTUM DISTRIBUTIONS; RECOIL-ION; PERTURBATION-THEORY; CROSS-SECTIONS; LASER FIELDS; HELIUM; MECHANISM; HE AB We have used a multi-particle imaging technique (COLTRIMS) to observe the double ionization of rare gas atoms by multi-photon absorption of 800 nm (1.5 eV) femto-second laser pulses and by single photon absorption (synchrotron radiation). Both processes are mediated by electron correlation. We discuss similarities and differences in the three-body final state momentum distributions. (C) 2001 Optical Society of America. C1 Inst Kernphys, D-60486 Frankfurt, Germany. Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany. Strahlenzentrum, D-35392 Giessen, Germany. Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany. RP Weber, T (reprint author), Inst Kernphys, August Euler Str 6, D-60486 Frankfurt, Germany. RI Doerner, Reinhard/A-5340-2008; Weber, Thorsten/K-2586-2013; OI Doerner, Reinhard/0000-0002-3728-4268; Weber, Thorsten/0000-0003-3756-2704; Staudte, Andre/0000-0002-8284-3831 NR 27 TC 13 Z9 14 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1094-4087 J9 OPT EXPRESS JI Opt. Express PD MAR 26 PY 2001 VL 8 IS 7 BP 368 EP 376 PG 9 WC Optics SC Optics GA 415CR UT WOS:000167703400004 PM 19417829 ER PT J AU LaGattuta, KJ AF LaGattuta, KJ TI Photoionization of atoms described by Fermi Molecular Dynamics: toward a firmer theoretical basis SO OPTICS EXPRESS LA English DT Article ID NONSEQUENTIAL DOUBLE-IONIZATION; STRONG LASER FIELDS; MOMENTUM DISTRIBUTIONS; MULTIPLE IONIZATION; NUMERICAL-SOLUTION; COUPLED EQUATIONS; ARGON ATOMS; HELIUM; IONS AB The application of Fermi Molecular Dynamics (FMD) to the modeling of the photoionization of atoms by a short pulse of long wavelength laser radiation is examined in detail. Depression of the single ionization threshold to values of the electric field strength below the classical over-the-barrier threshold, a common occurrence in FMD, is shown to arise from the preexcitation of bound electrons into a continuum of unphysical low-lying excited states. A connection is made to analogous calculations performed with the quantum Hamilton-Jacobi equation, in which the time-dependent quantum potential (Q) plays a role similar to that played in FMD by the so-called Heisenberg potential (V-H). Replacement of V-H by Q in the MD equations of motion results in a large reduction in the number of excitations to unphysical bound states, while producing no essential change in the photoionization probability. (C) 2001 Optical Society of America. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP LaGattuta, KJ (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 18 TC 6 Z9 6 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1094-4087 J9 OPT EXPRESS JI Opt. Express PD MAR 26 PY 2001 VL 8 IS 7 BP 401 EP 410 PG 10 WC Optics SC Optics GA 415CR UT WOS:000167703400008 PM 19417833 ER PT J AU Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Stepaniak, CJ Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Eckhart, E Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Pedlar, TK Schwarthoff, H Thayer, JB von Toerne, E Zoeller, MM Richichi, SJ Sevrini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Zhou, X Coan, TE Fadeyev, V Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Kopp, S Mahmood, AH Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D McGee, S Perera, LP Zhou, GJ Lipeles, E Pappas, SP Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F Jaffe, DE Masek, G Paar, HP Potter, EM Prell, S Sharma, V Asner, DM Eppich, A Hill, TS Morrison, RJ Briere, RA Chen, GP Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kandaswamy, J Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Nordbert, E Patterson, JR Peterson, D Riley, D Thayer, JG Urner, D Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, I Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, KW Janicek, R Patel, PM Sadoff, AJ Ammar, R Bean, A Besson, D Davis, R Kwak, N Zhao, X AF Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Stepaniak, CJ Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Eckhart, E Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Pedlar, TK Schwarthoff, H Thayer, JB von Toerne, E Zoeller, MM Richichi, SJ Sevrini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Zhou, X Coan, TE Fadeyev, V Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Kopp, S Mahmood, AH Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D McGee, S Perera, LP Zhou, GJ Lipeles, E Pappas, SP Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F Jaffe, DE Masek, G Paar, HP Potter, EM Prell, S Sharma, V Asner, DM Eppich, A Hill, TS Morrison, RJ Briere, RA Chen, GP Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kandaswamy, J Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Nordbert, E Patterson, JR Peterson, D Riley, D Thayer, JG Urner, D Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, I Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, KW Janicek, R Patel, PM Sadoff, AJ Ammar, R Bean, A Besson, D Davis, R Kwak, N Zhao, X CA CLEO Collaboration TI First observation of the decays B-0 -> D*- p(p)over-tilde pi(+) and B-0 -> D*- p(n)over-bar SO PHYSICAL REVIEW LETTERS LA English DT Article ID BARYON PRODUCTION; DETECTOR AB We report the first observation of exclusive decays of the type B --> D*N (N) over barX, where N is a nucleon. Using a sample of 9.7 X 10(6)B (B) over bar pairs collected with the CLEO detector operating at the Cornell Electron Storage Ring, we measure the branching fractions B(B-0 --> D*(-) p (p) over bar pi (+)) = (6.5(-1.2)(+1.3) +/- 1.0) X 10(-4) and B(B-0 --> D*(-) p (n) over bar) = (14.5(-3.0)(+3.4) +/- 2.7) X 10(-4). Antineutrons are identified by their annihilation in the CsI electromagnetic calorimeter. C1 Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Univ Texas, Austin, TX 78712 USA. Univ Texas Pan Amer, Edinburg, TX 78539 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. MIT, Cambridge, MA 02139 USA. RP Anderson, S (reprint author), Univ Minnesota, Minneapolis, MN 55455 USA. RI Warburton, Andreas/N-8028-2013; Briere, Roy/N-7819-2014 OI Warburton, Andreas/0000-0002-2298-7315; Briere, Roy/0000-0001-5229-1039 NR 11 TC 35 Z9 35 U1 0 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 MAR 26 PY 2001 VL 86 IS 13 BP 2732 EP 2736 DI 10.1103/PhysRevLett.86.2732 PG 5 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000009 PM 11290026 ER PT J AU Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Nordberg, E Patterson, JR Peterson, D Riley, D Thayer, JG Thies, PG Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, RW Janicek, R Patel, PM Sadoff, AJ Ammar, R Bean, A Besson, D Davis, R Kwak, N Zhao, X Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Mahmood, AH Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Eckhart, E Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Pedlar, TK Schwarthoff, H Thayer, JB von Toerne, E Zoeller, MM Richichi, SJ Severini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Menon, N Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Kwon, Y Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Kopp, S Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D McGee, S Perera, LP Zhou, GJ Lipeles, E Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F Jaffe, DE Masek, G Paar, HP Potter, EM Press, S Sharma, V Asner, DM Eppich, A Hill, TS Morrison, RJ Briere, RA Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG AF Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Nordberg, E Patterson, JR Peterson, D Riley, D Thayer, JG Thies, PG Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, RW Janicek, R Patel, PM Sadoff, AJ Ammar, R Bean, A Besson, D Davis, R Kwak, N Zhao, X Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Mahmood, AH Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Eckhart, E Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Pedlar, TK Schwarthoff, H Thayer, JB von Toerne, E Zoeller, MM Richichi, SJ Severini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Menon, N Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Kwon, Y Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Kopp, S Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D McGee, S Perera, LP Zhou, GJ Lipeles, E Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F Jaffe, DE Masek, G Paar, HP Potter, EM Press, S Sharma, V Asner, DM Eppich, A Hill, TS Morrison, RJ Briere, RA Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG CA CLEO Collaboration TI Measurement of the relative branching fraction of gamma r(4S) to charged and neutral B-meson pairs SO PHYSICAL REVIEW LETTERS LA English DT Article ID DECAYS; DETECTOR AB We analyze 9.7 X 10(6) B (B) over bar pairs recorded with the CLEO detector to determine the production ratio of charged to neutral B-meson pairs produced at the Y(4S) resonance. We measure the rates for B-0 --> J/psiK((*)0) and B+ --> J/psiK((*)+) decays and use the world-average B-meson lifetime ratio to extract the relative widths f(+-)/f(00) = Gamma (Y(4S)-->B+B-)/Gamma (Y(4S)-->B-0(B) over bar (0)) = 1.04 +/- 0.07(stat) +/- 0.04(syst). With the assumption that f(+-) + f(00) = 1, we obtain f(00) = 0.49 +/- 0.02(stat) +/- 0.01(syst) and f(+-) = 0.51 +/- 0.02(stat) +/- 0.01(syst). This production ratio and its uncertainty apply to all exclusive B-meson branching fractions measured at the Y(4S) resonance. C1 Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Univ Texas, Austin, TX 78712 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Colorado, Boulder, CO 80309 USA. Univ Texas Pan Amer, Edinburg, TX 78539 USA. Yonsei Univ, Seoul 120749, South Korea. Univ Cincinnati, Cincinnati, OH 45221 USA. MIT, Cambridge, MA 02139 USA. RP Alexander, JP (reprint author), Cornell Univ, Ithaca, NY 14853 USA. RI Warburton, Andreas/N-8028-2013; Briere, Roy/N-7819-2014; OI Warburton, Andreas/0000-0002-2298-7315; Briere, Roy/0000-0001-5229-1039; Poling, Ronald/0000-0001-7305-4702 NR 16 TC 42 Z9 42 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 MAR 26 PY 2001 VL 86 IS 13 BP 2737 EP 2741 DI 10.1103/PhysRevLett.86.2737 PG 5 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000010 PM 11290027 ER PT J AU Yang, UK Adams, T Alton, A Arroyo, CG Avvakumov, S de Barbaro, L de Barbaro, P Bazarko, AO Bernstein, RH Bodek, A Bolton, T Brau, J Buchholz, D Budd, H Bugel, L Conrad, J Drucker, RB Fleming, BT Formaggio, JA Frey, R Goldman, J Goncharov, M Harris, DA Johnson, RA Kim, JH King, BJ Kinnel, T Koutsoliotas, S Lamm, MJ Marsh, W Mason, D McFarland, KS McNulty, C Mishra, SR Naples, D Nienaber, P Romosan, A Sakumoto, WK Schellman, H Sciulli, FJ Seligman, WG Shaevitz, MH Smith, WH Spentzouris, P Stern, EG Suwonjandee, N Vaitaitis, A Vakili, M Yu, J Zeller, GP Zimmerman, ED AF Yang, UK Adams, T Alton, A Arroyo, CG Avvakumov, S de Barbaro, L de Barbaro, P Bazarko, AO Bernstein, RH Bodek, A Bolton, T Brau, J Buchholz, D Budd, H Bugel, L Conrad, J Drucker, RB Fleming, BT Formaggio, JA Frey, R Goldman, J Goncharov, M Harris, DA Johnson, RA Kim, JH King, BJ Kinnel, T Koutsoliotas, S Lamm, MJ Marsh, W Mason, D McFarland, KS McNulty, C Mishra, SR Naples, D Nienaber, P Romosan, A Sakumoto, WK Schellman, H Sciulli, FJ Seligman, WG Shaevitz, MH Smith, WH Spentzouris, P Stern, EG Suwonjandee, N Vaitaitis, A Vakili, M Yu, J Zeller, GP Zimmerman, ED TI Measurements of F-2 and xF(3)(v)-xF(3)(v) from CCPR v(mu)-Fe and (v)over-bar mu-Fe data in a physics model-independent way SO PHYSICAL REVIEW LETTERS LA English DT Article ID DEUTERON STRUCTURE FUNCTIONS; FLAVOR STRUCTURE FUNCTIONS; SCATTERING CROSS-SECTIONS; PARTON DISTRIBUTIONS; NUCLEON SCATTERING; CHARM PRODUCTION; QCD FORMULATION; GLOBAL ANALYSIS; HIGHER TWIST; SIGMA(L)/SIGMA(T) AB We report on the extraction of the structure functions F-2 and Delta xF(3) = xF(3)(upsilon) - xF(3)(<()over bar>) from CCFR upsilon (mu)-Fe and <()over bar>(mu)-Fe differential cross sections. The extraction is performed in a physics model-independent (PMI) way. This first measurement of Delta xF(3), which is useful in testing models of heavy charm production, is higher than current theoretical predictions. The ratio of the F-2 (PMI) values measured in upsilon (mu) and mu scattering is in agreement (within 5%) with the predictions of next-to-leading-order parton distribution functions using massive charm production schemes, thus resolving the long-standing discrepancy between the two sets of data. C1 Univ Cincinnati, Cincinnati, OH 45221 USA. Columbia Univ, New York, NY 10027 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Kansas State Univ, Manhattan, KS 66506 USA. Northwestern Univ, Evanston, IL 60208 USA. Univ Oregon, Eugene, OR 97403 USA. Univ Rochester, Rochester, NY 14627 USA. Univ Wisconsin, Madison, WI 53706 USA. RP Yang, UK (reprint author), Univ Cincinnati, Cincinnati, OH 45221 USA. RI Frey, Raymond/E-2830-2016 OI Frey, Raymond/0000-0003-0341-2636 NR 25 TC 82 Z9 82 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 MAR 26 PY 2001 VL 86 IS 13 BP 2742 EP 2745 DI 10.1103/PhysRevLett.86.2742 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000011 PM 11290028 ER PT J AU Korichi, A Wilson, AN Hannachi, F Lopez-Martens, A Rejmund, M Schuck, C Vieu, C Chmel, G Gorgen, A Hubel, H Rossbach, D Schonwasser, S Bergstrom, M Nyako, BM Timar, J Bazzacco, D Lunardi, S Rossi-Alvarez, C Bednarczyk, P Kintz, N Naguleswaran, S Astier, A Cullen, DM Sharpey-Schafer, JF Lauritsen, T Wadsworth, R AF Korichi, A Wilson, AN Hannachi, F Lopez-Martens, A Rejmund, M Schuck, C Vieu, C Chmel, G Gorgen, A Hubel, H Rossbach, D Schonwasser, S Bergstrom, M Nyako, BM Timar, J Bazzacco, D Lunardi, S Rossi-Alvarez, C Bednarczyk, P Kintz, N Naguleswaran, S Astier, A Cullen, DM Sharpey-Schafer, JF Lauritsen, T Wadsworth, R TI Linear polarization measurement of interband transitions in superdeformed Hg-190: Model-independent evidence for octupole vibrational structures SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUASI-PARTICLE EXCITATIONS; COMPTON POLARIMETER; BANDS; NUCLEI; ENERGIES; STATES; PARITY; DECAY; SPINS AB The linear polarization of gamma rays between excited and yrast superdeformed (SD) states in Hg-190 was measured using the four-element CLOVER detectors of the EUROBALL IV gamma -ray spectrometer. This measurement shows in a model-independent way that the interband transitions which compete with the highly collective in-band quadrupole transitions are largely enhanced electric dipoles. Not only do these results represent the first measurement of the multipolarity of transitions between different SD states, but they also provide strong evidence for the interpretation of the structures in the SD minimum of the A similar to 190 region in terms of octupole excitations. C1 CNRS, IN2P3, Ctr Spectrometrie Nucl & Spectrometrie Masse, F-91405 Orsay, France. Univ Paris 11, F-91405 Orsay, France. Univ York, Dept Phys, York Y010 5DD, N Yorkshire, England. Univ Bonn, Inst Strahlen & Kernphys, D-53115 Bonn, Germany. Niels Bohr Inst, DK-2100 Copenhagen O, Denmark. Inst Nucl Res, H-4001 Debrecen, Hungary. Dept Fis, Padua, Italy. Ist Nazl Fis Nucl, Sez Padova, Padua, Italy. Univ Strasbourg 1, F-67037 Strasbourg, France. CNRS, IN2P3, IReS, F-67037 Strasbourg, France. Univ Lyon 1, F-69622 Villeurbanne, France. IPN Lyon, IN2P3, CNRS, F-69622 Villeurbanne, France. Univ Lyon 1, F-69622 Villeurbanne, France. Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. Natl Accelerator Ctr, Cape Town, South Africa. Argonne Natl Lab, Argonne, IL 60439 USA. H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland. RP Bednarczyk, P (reprint author), CNRS, IN2P3, Ctr Spectrometrie Nucl & Spectrometrie Masse, F-91405 Orsay, France. RI Naguleswaran, Sanjeev/A-4305-2013; OI Gorgen, Andreas/0000-0003-1916-9941 NR 21 TC 30 Z9 31 U1 1 U2 2 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 MAR 26 PY 2001 VL 86 IS 13 BP 2746 EP 2749 DI 10.1103/PhysRevLett.86.2746 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000012 PM 11290029 ER PT J AU Davids, B Anthony, DW Aumann, T Austin, SM Baumann, T Bazin, D Clement, RRC Davids, CN Esbensen, H Lofy, PA Nakamura, T Sherrill, BM Yurkon, J AF Davids, B Anthony, DW Aumann, T Austin, SM Baumann, T Bazin, D Clement, RRC Davids, CN Esbensen, H Lofy, PA Nakamura, T Sherrill, BM Yurkon, J TI S-17(0) determined from the Coulomb breakup of 83 MeV/nucleon B-8 SO PHYSICAL REVIEW LETTERS LA English DT Article ID BE-7(P,GAMMA)B-8 CROSS-SECTION; LOW ENERGIES; S-FACTOR; ASTROPHYSICAL INTEREST; E2 TRANSITIONS; DISSOCIATION; GAMMA)B-8; BE-7(P; NUCLEAR; FLUX AB A kinematically complete measurement was made of the Coulomb dissociation of SE nuclei on a Pb target at 83 MeV/nucleon. The cross section was measured at low relative energies in order to infer the astrophysical S factor for the Be-7(p, gamma)B-8 reaction. A first-order perturbation theory analysis including El, E2, and M1 transitions was employed to extract the El strength relevant to neutrino-producing reactions in the solar interior. By fitting the measured cross section from E-rel = 130 to 400 keV, we find S-17(0)= 17.8(-1.2)(+1.4) eV b. C1 Michigan State Univ, Natl Supercond Cyclotron Lab, E Lansing, MI 48824 USA. Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Univ Groningen, Kernfys Versneller Inst, Zernikelaan 25, NL-9747 AA Groningen, Netherlands. RI Sherrill, Bradley/B-4098-2009; Sherrill, Bradley/B-3378-2011; Aumann, Thomas/B-1455-2012; Nakamura, Takashi/N-5390-2015 OI Nakamura, Takashi/0000-0002-1838-9363 NR 31 TC 83 Z9 83 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 26 PY 2001 VL 86 IS 13 BP 2750 EP 2753 DI 10.1103/PhysRevLett.86.2750 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000013 PM 11290030 ER PT J AU Lafon, R Chaloupka, JL Sheehy, B Paul, PM Agostini, P Kulander, KC DiMauro, LF AF Lafon, R Chaloupka, JL Sheehy, B Paul, PM Agostini, P Kulander, KC DiMauro, LF TI Electron energy spectra from intense laser double ionization of helium SO PHYSICAL REVIEW LETTERS LA English DT Article ID NONSEQUENTIAL DOUBLE-IONIZATION; FIELD TUNNELING LIMIT; IMPACT IONIZATION; MOMENTUM DISTRIBUTIONS; CROSS-SECTIONS; IONS; THRESHOLD; DYNAMICS; SINGLE; ATOMS AB The double ionization of helium in the strong-field limit has been studied using an electron-ion coincidence technique. The observed double ionization electron energy spectra differ significantly from the single ionization distributions. This gives new support to the rescattering model of double ionization and explicitly reveals the role of backward electron emission following the e-2e ionizing collision. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Ctr Etud Saclay, SPAM, F-91191 Gif Sur Yvette, France. Lawrence Livermore Natl Lab, TAMP, Livermore, CA 94551 USA. RP Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 24 TC 92 Z9 94 U1 0 U2 12 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 26 PY 2001 VL 86 IS 13 BP 2762 EP 2765 DI 10.1103/PhysRevLett.86.2762 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000016 PM 11290033 ER PT J AU Ostroumov, PN Pardo, RC Zinkann, GP Shepard, KW Nolen, JA AF Ostroumov, PN Pardo, RC Zinkann, GP Shepard, KW Nolen, JA TI Simultaneous acceleration of multiply charged ions through a superconducting linac SO PHYSICAL REVIEW LETTERS LA English DT Article AB The possibility of simultaneously accelerating particles with a range of charge-to-mass ratios (similar to 20%) to the same energy is proposed and demonstrated for a superconducting linac. Uranium ions stripped in a foil with eight charge states have been accelerated through a portion of the ATLAS linac from 286 to 690 MeV, with 94% of the injected uranium in the accelerated beam. Emittance of the resultant beam has been measured and the energy spread was 1.3% compared to 0.4% for a single charge state. This development has immediate application to the high-intensity acceleration of heavy ions that are limited by ion-source intensities, such as the proposed Rare Isotope Accelerator Facility. C1 Argonne Natl Lab, Dept Phys, Argonne, IL 60439 USA. RP Ostroumov, PN (reprint author), Argonne Natl Lab, Dept Phys, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 21 Z9 21 U1 0 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 MAR 26 PY 2001 VL 86 IS 13 BP 2798 EP 2801 DI 10.1103/PhysRevLett.86.2798 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000025 PM 11290042 ER PT J AU Saltzberg, D Gorham, P Walz, D Field, C Iverson, R Odian, U Resch, G Schoessow, P Williams, D AF Saltzberg, D Gorham, P Walz, D Field, C Iverson, R Odian, U Resch, G Schoessow, P Williams, D TI Observation of the Askaryan effect: Coherent microwave Cherenkov emission from charge asymmetry in high-energy particle cascades SO PHYSICAL REVIEW LETTERS LA English DT Article ID RADIO PULSES; NEUTRINOS; SHOWERS; ICE AB We present the first direct experimental evidence for the charge excess in high-energy particle showers and corresponding radio emission predicted nearly 40 years ago by Askaryan. We directed picosecond pulses of GeV bremsstrahlung photons at the SLAG Final Focus Test Beam into a 3.5 ton silica sand target, producing electromagnetic showers several meters long. A series of antennas spanning 0.3 to 6 GHz detected strong, subnanosecond radio-frequency pulses produced by the showers. Measurements of the polarization, coherence, timing, field strength vs shower depth, and field strength vs frequency are completely consistent with predictions. These measurements thus provide strong support for experiments designed to detect high-energy cosmic rays such as neutrinos via coherent radio emission from their cascades. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Saltzberg, D (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. NR 23 TC 166 Z9 168 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 MAR 26 PY 2001 VL 86 IS 13 BP 2802 EP 2805 DI 10.1103/PhysRevLett.86.2802 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000026 PM 11290043 ER PT J AU Moody, JD MacGowan, BJ Rothenberg, JE Berger, RL Divol, L Glenzer, SH Kirkwood, RK Williams, EA Young, PE AF Moody, JD MacGowan, BJ Rothenberg, JE Berger, RL Divol, L Glenzer, SH Kirkwood, RK Williams, EA Young, PE TI Backscatter reduction using combined spatial, temporal, and polarization beam smoothing in a long-scale-length laser plasma SO PHYSICAL REVIEW LETTERS LA English DT Article ID INERTIAL CONFINEMENT FUSION; STIMULATED BRILLOUIN-SCATTERING; RAMAN-SCATTERING; HOHLRAUM PLASMAS; TARGETS; SUPPRESSION; INSTABILITIES; FLUCTUATIONS; INCOHERENCE; IGNITION AB Spatial, temporal, and polarization smoothing schemes are combined for the first time to reduce to a few percent the total stimulated backscatter of a NIF-like probe laser beam (2 x 10(15) W/cm(2), 351 nm, f/8) in a long-scale-length laser plasma. Combining temporal and polarization smoothing reduces simulated Brillouin scattering and simulated Raman scattering (SRS) up to an order of magnitude although neither smoothing scheme by itself is uniformly effective. The results agree with trends observed in simulations performed with the laser-plasma interaction code F3D simulations. C1 Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. CEA, DIF, F-91680 Bruyeres Le Chatel, France. RP Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 36 TC 45 Z9 48 U1 1 U2 11 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 MAR 26 PY 2001 VL 86 IS 13 BP 2810 EP 2813 DI 10.1103/PhysRevLett.86.2810 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000028 PM 11290045 ER PT J AU Mawatari, Y Clem, JR AF Mawatari, Y Clem, JR TI Magnetic-flux penetration and critical currents in superconducting strips with slits SO PHYSICAL REVIEW LETTERS LA English DT Article ID FIELD; HYSTERESIS; BARRIERS AB We theoretically investigate transport-current-induced magnetic-flux penetration into superconducting strip lines with slits. Even when the individual strips have no bulk pinning, geometrical barriers prevent penetration of magnetic flux into the innermost strips while flux quasistatically penetrates into the outermost slits. The critical current of strip lines with 2N slits at zero applied magnetic field is found to be enhanced by a factor of (N + 1)(1/2) above that of a single strip line without slits. Under suitable conditions, a domelike flux distribution due to the geometrical barrier can appear in the individual strips even in the absence of an applied magnetic field. C1 Natl Inst Adv Ind Sci & Technol, Energy Elect Inst, Tsukuba, Ibaraki 3058568, Japan. Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA. RP Mawatari, Y (reprint author), Natl Inst Adv Ind Sci & Technol, Energy Elect Inst, Tsukuba, Ibaraki 3058568, Japan. NR 15 TC 25 Z9 25 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 MAR 26 PY 2001 VL 86 IS 13 BP 2870 EP 2873 DI 10.1103/PhysRevLett.86.2870 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000043 PM 11290060 ER PT J AU Ohldag, H Scholl, A Nolting, F Anders, S Hillebrecht, FU Stohr, J AF Ohldag, H Scholl, A Nolting, F Anders, S Hillebrecht, FU Stohr, J TI Spin reorientation at the antiferromagnetic NiO(001) surface in response to an adjacent ferromagnet SO PHYSICAL REVIEW LETTERS LA English DT Article ID DICHROISM SPECTROMICROSCOPY AB Polarization dependent x-ray photoemission electron microscopy was used to investigate the spin structure near the surface of an antiferromagnetic NiO(001) single crystal in response to the deposition of a thin ferromagnetic Co film. For the cleaved NiO surface we observe only a subset of bulklike antiferromagnetic domains which is attributed to minimization of dipolar energies. Upon Co deposition a spin reorientation near the NiO interface occurs, with the antiferromagnetic spins rotating in plane, parallel to the spins of the Co layer. Our results demonstrate that the spin configuration in an antiferromagnet near its interface with a ferromagnet may significantly deviate from that in the bulk antiferromagnet. C1 Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. Univ Dusseldorf, Inst Angew Phys, D-40225 Dusseldorf, Germany. Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany. RP Ohldag, H (reprint author), Stanford Synchrotron Radiat Lab, POB 20450, Stanford, CA 94309 USA. RI Scholl, Andreas/K-4876-2012; Ohldag, Hendrik/F-1009-2014; Raoux, Simone/G-3920-2016 NR 12 TC 195 Z9 196 U1 4 U2 35 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 MAR 26 PY 2001 VL 86 IS 13 BP 2878 EP 2881 DI 10.1103/PhysRevLett.86.2878 PG 4 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000045 PM 11290062 ER PT J AU Berman, GP Doolen, GD Hammel, PC Tsifrinovich, VI AF Berman, GP Doolen, GD Hammel, PC Tsifrinovich, VI TI Magnetic resonance force microscopy quantum computer with tellurium donors in silicon SO PHYSICAL REVIEW LETTERS LA English DT Article AB We propose a magnetic resonance force microscopy (MRFM)-based nuclear spin quantum computer using tellurium impurities in silicon. This approach to quantum computing combines well-developed silicon technology and expected advances in MRFM. Our proposal does not use electrostatic gates to realize quantum logic operations. C1 Univ Calif Los Alamos Natl Lab, T13, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, MST10, Los Alamos, NM 87545 USA. Polytech Univ, IDS Dept, Brooklyn, NY 11201 USA. RP Berman, GP (reprint author), Univ Calif Los Alamos Natl Lab, T13, POB 1663, Los Alamos, NM 87545 USA. RI Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 9 TC 35 Z9 35 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 MAR 26 PY 2001 VL 86 IS 13 BP 2894 EP 2896 DI 10.1103/PhysRevLett.86.2894 PG 3 WC Physics, Multidisciplinary SC Physics GA 414YD UT WOS:000167693000049 PM 11290066 ER PT J AU Henderson, LF Takayama, K Crutchfield, WY Itabashi, S AF Henderson, LF Takayama, K Crutchfield, WY Itabashi, S TI The persistence of regular reflection during strong shock diffraction over rigid ramps SO JOURNAL OF FLUID MECHANICS LA English DT Article ID MACH REFLECTION; WAVE REFLECTIONS; STEADY FLOWS; TRANSITION; RECONSIDERATION; VISCOSITY; PARADOX AB We report on calculations and experiments with strong shocks diffracting over rigid ramps in argon. The numerical results were obtained by integrating the conservation equations that included the Navier-Stokes equations. The results predict that if the ramp angle 8 is less than the angle theta, that corresponds to the detachment of a shock, theta < (e), then the onset of Mach reflection (MR) will be delayed by the initial appearance of a precursor regular reflection (PRR). The PRR is subsequently swept away by an overtaking corner signal (cs) that forces the eruption of the MR which then rapidly evolves into a self-similar state. An objective was to make an experimental test of the predictions. These were confirmed by twice photographing the diffracting shock as it travelled along the ramp. We could get a PRR with the first exposure and an MR with the second. According to the von Neumann perfect gas theory, a PRR does not exist when theta < (e). A viscous length scale x(int) is a measure of the position on the ramp where the dynamic transition PRR --> MR takes place. It is significantly larger in the experiments than in the calculations. This is attributed to the fact that fluctuations from turbulence and surface roughness were not modelled in the calculations. It was found that x(int) --> infinity as theta --> theta (e) Experiments were done to find out how x(int) depended on the initial shock tube pressure p(0). The dependence was strong but could be greatly reduced by forming a Reynolds number based on x(int). Finally by definition, regular reflection (R) never interacts with a boundary layer, while PRR always interacts; so they are different phenomena. C1 Tohoku Univ, Inst Fluid Sci, Shock Wave Res Ctr, Sendai, Miyagi 9808577, Japan. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Computat Sci & Engn, Berkeley, CA 94720 USA. RP Henderson, LF (reprint author), Tohoku Univ, Inst Fluid Sci, Shock Wave Res Ctr, Sendai, Miyagi 9808577, Japan. NR 47 TC 21 Z9 22 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI PORT CHESTER PA 110 MIDLAND AVE, PORT CHESTER, NY 10573-4930 USA SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD MAR 25 PY 2001 VL 431 BP 273 EP 296 DI 10.1017/S0022112000003165 PG 24 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 421AU UT WOS:000168040600010 ER PT J AU Hansen, RK Parra, I Hilsenbeck, SG Himelstein, B Fuqua, SAW AF Hansen, RK Parra, I Hilsenbeck, SG Himelstein, B Fuqua, SAW TI Hsp27-induced MMP-9 expression is influenced by the Src tyrosine protein kinase Yes SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article DE hsp27; MMP-9; Yes; MDA-MB-231; cDNA expression array; breast cancer; heat shock protein; invasion; matrix metalloproteinase; src kinase ID HUMAN BREAST-CANCER; HEAT-SHOCK PROTEINS; COLLAGENASE-GENE-EXPRESSION; ENDOTHELIAL-CELLS; IV COLLAGENASE; ACTIN REORGANIZATION; GROWTH-FACTOR; GELATINASE-B; HSP27 GENE; RESISTANCE AB The small heat shock protein hsp27 is associated with aggressive tumor behavior in certain subsets of breast cancer patients. Previously we demonstrated that hsp27 overexpression in breast cancer cells increased in vitro and in vivo invasiveness, suggesting that hsp27 influences the metastatic process. To investigate this role for hsp27, we have utilized MDA-MB-231 breast cancer cells that overexpress hsp27 and cDNA expression array technology. We demonstrate that hsp27 overexpression up-regulates MMP-9 expression and activity and down-regulates Yes expression. Furthermore, our results suggest that Yes may be involved in regulating MMP-9 expression, as well as in vitro invasion. Reconstitution of Yes expression by transfection into hsp27-overexpressing cells decreased MMP-9 expression, and increased in vitro invasiveness, abrogating the phenotype conferred by hsp27 overexpression. Therefore, our results provide a new potential mechanism by which hsp27 affects the metastatic cascade--through regulation of MMP-9 and Yes expression. (C) 2001 Academic Press. C1 Baylor Coll Med, Breast Ctr, Houston, TX 77030 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA. RP Fuqua, SAW (reprint author), Baylor Coll Med, Breast Ctr, 1 Baylor Plaza, Houston, TX 77030 USA. FU NCI NIH HHS [CA58183] NR 47 TC 23 Z9 24 U1 0 U2 1 PU ACADEMIC PRESS INC 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 MAR 23 PY 2001 VL 282 IS 1 BP 186 EP 193 DI 10.1006/bbrc.2001.4548 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 416UK UT WOS:000167798400030 PM 11263990 ER PT J AU Lavrik, NV Tipple, CA Sepaniak, MJ Datskos, PG AF Lavrik, NV Tipple, CA Sepaniak, MJ Datskos, PG TI Enhanced chemi-mechanical transduction at nanostructured interfaces SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; HOST-GUEST INTERACTIONS; FORCE MEASUREMENTS; GOLD; CANTILEVERS; SENSORS; STRESS; ARRAYS; AU AB Interfacial molecular recognition processes can be converted into mechanical responses via modulation of surface stress. We demonstrate dramatic enhancement in this transduction when quasi 3-D interfaces with nano-size features are used. Microcantelever surfaces are modified with gold nanospheres or granular films and functionalized with macrocycle cavity and receptors. Deflections of these nanostructured cantilevers in response to vapor phase hydrocarbons are two orders of magnitude larger than with conventional smooth surfaces. Such a significant enhancements of surface stress changes resulting from intermolecular interactions at vapor- and liquid-solid interfaces offer an attractive means to develop novel nano-mechanical devices that respond directly and sensitively to chemical stimuli. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37919 USA. Oak Ridge Natl Lab, Engn Technol Div, Oak Ridge, TN 37831 USA. RP Sepaniak, MJ (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37919 USA. RI Lavrik, Nickolay/B-5268-2011 OI Lavrik, Nickolay/0000-0002-9543-5634 NR 29 TC 58 Z9 60 U1 2 U2 9 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 MAR 23 PY 2001 VL 336 IS 5-6 BP 371 EP 376 DI 10.1016/S0009-2614(01)00155-5 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 414ZZ UT WOS:000167697200001 ER PT J AU Rodriguez, JA Hrbek, J Dvorak, J Jirsak, T Maiti, A AF Rodriguez, JA Hrbek, J Dvorak, J Jirsak, T Maiti, A TI Interaction of sulfur with TiO2(110): photoemission and density-functional studies SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; PLANE-WAVE; ADSORPTION; SURFACES; H2S; SO2; CO; REACTIVITY; MGO(100); CLUSTER AB Upon adsorption of S-2 On TiO2(1 1 0) at 300 K, high-resolution photoemission shows the presence of at least three different types of sulfur species associated with SOx groups and S atoms bonded to the Ti rows or Vacancies in the bridging oxygen rows. In addition, S,, species are detected on the oxide surface after dosing sulfur at 100 K. The bonding of sulfur to TiO2(1 1 0) was examined using first-principles density-functional calculations and the periodic supercell approach. The density-functional calculations show important variations in the nature of the bonding depending on the sulfur coverage and the presence of O vacancies on the oxide surface. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Mol Simulat Inc, San Diego, CA 92121 USA. RP Rodriguez, JA (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RI Hrbek, Jan/I-1020-2013 NR 34 TC 34 Z9 34 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 MAR 23 PY 2001 VL 336 IS 5-6 BP 377 EP 384 DI 10.1016/S0009-2614(01)00182-8 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 414ZZ UT WOS:000167697200002 ER PT J AU Alam, TM Lang, DP AF Alam, TM Lang, DP TI Probing dissolution surface structure in phosphate glasses using H-1-P-31 cross-polarization edited radio frequency dipolar recoupling experiments SO CHEMICAL PHYSICS LETTERS LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; 2D EXCHANGE NMR; P-31 MAS NMR; ULTRAPHOSPHATE GLASSES; ROTATING SOLIDS; LOCAL-STRUCTURE; QUANTUM NMR; CONNECTIVITIES AB The use of H-1-P-31 cross-polarization (CP)-edited radio frequency dipolar recoupled (RFDR) two-dimensional (2D) NMR exchange experiments for the study of surface dissolution species in solution-aged metaphosphate glass is reported. It is demonstrated that use of CP allows the resonances of phosphate tetrahedral species within the hydrated dissolution surface to be selectively and cleanly edited from the bulk unaged phosphate species. Incorporating the CP-editing into a 2D RFDR exchange experiment also allows the local spatial connectivity between these surface dissolution phosphate species to be directly addressed. (C) 2001 Published by Elsevier Science B.V. C1 Sandia Natl Labs, Organ Mat Dept, Albuquerque, NM 87185 USA. RP Alam, TM (reprint author), Sandia Natl Labs, Organ Mat Dept, POB 5800, Albuquerque, NM 87185 USA. NR 24 TC 9 Z9 9 U1 0 U2 4 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 MAR 23 PY 2001 VL 336 IS 5-6 BP 385 EP 391 DI 10.1016/S0009-2614(01)00151-8 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 414ZZ UT WOS:000167697200003 ER PT J AU Schmidt, TJ Jusys, Z Gasteiger, HA Behm, RJ Endruschat, U Boennemann, H AF Schmidt, TJ Jusys, Z Gasteiger, HA Behm, RJ Endruschat, U Boennemann, H TI On the CO tolerance of novel colloidal PdAu/carbon electrocatalysts SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE CO-tolerant catalyst for H-2 oxidation; PdAu/carbon electrocatalyst; polymer electrolyte membrane fuel cell ID ROTATING-DISK ELECTRODE; SINGLE-CRYSTAL PLANES; FUEL-CELL CATALYSTS; PT-RU ALLOYS; ELECTROCHEMICAL OXIDATION; SURFACE-COMPOSITION; ELEMENTARY STEPS; CARBON-MONOXIDE; ELECTROOXIDATION; AU AB The synthesis and characterization (physical and electrochemical) of novel PdAu/Vulcan XC 72 electrocatalysts are described. The catalysts were prepared via deposition and activation of preformed bimetallic colloidal precursors. Physical characterization of the catalysts involved high-resolution transmission electron microscopy and powder X-ray diffraction. Electrochemically, the PdAu-catalysts were characterized by means of the thin-film rotating disk method and by differential electrochemical mass spectrometry. H-2, CO and CO/H-2 oxidations on PdAu-Vulcan electrodes with different hull; compositions were used as probe reactions to determine the CO tolerance of this catalyst system and its physical origin. We propose that the GO-tolerance mechanism at low overpotentials for PdAu/Vulcan electrodes is governed by both a lower CO steady-state surface coverage compared to PtRu/Vulcan due to a lower CO adsorption energy and finite CO oxidation rates, which both result in free surface sites for H-2 oxidation to take place, At elevated temperatures (60 degreesC) this effect is mole pronounced. providing more free active Pd sites for H-2 oxidation. CO/H-2 oxidation measurements (1000 and 250 ppm CO) showed the superior activity of PdAu compared with a state-of-the-art PtRu catalyst at technically relevant potentials, especially ill Pd-rich alloys, (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Ulm, Abt Oberflaechenchem & Katalyse, D-89069 Ulm, Germany. Max Planck Inst Kohlenforsch, D-45466 Mulheim An Der Ruhr, Germany. RP Lawrence Berkeley Lab, 1 Cyclotron Rd,Ms 2-100, Berkeley, CA 94720 USA. EM tjschmidt@lbl.gov RI Schmidt, Thomas/A-2586-2010 OI Schmidt, Thomas/0000-0002-1636-367X NR 43 TC 86 Z9 91 U1 4 U2 29 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 1572-6657 EI 1873-2569 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 23 PY 2001 VL 501 IS 1-2 BP 132 EP 140 DI 10.1016/S0022-0728(00)00516-7 PG 9 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 423YU UT WOS:000168206000014 ER PT J AU Anderson, DH Harth, G Horwitz, MA Eisenberg, D AF Anderson, DH Harth, G Horwitz, MA Eisenberg, D TI An interfacial mechanism and a class of inhibitors inferred from two crystal structures of the Mycobacterium tuberculosis 30 kDa major secretory protein (antigen 85B), a mycolyl transferase SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE Mycobacterium tuberculosis; 30 kDa major secretory protein; antigen 85B; mycolyl transferase; drug design ID EXTRACELLULAR PROTEINS; PROTECTIVE IMMUNITY; CROSS-VALIDATION; DRUG TARGETS; REFINEMENT; GROWTH; CRYSTALLOGRAPHY; TRYPTOPHAN; ENVELOPE; VACCINES AB The Mycobacterium tuberculosis 30 kDa major secretory protein (antigen 85B) is the most abundant protein exported by M. tuberculosis, as well as a potent immunoprotective antigen and a leading drug target. A mycolyl transferase of 285 residues, it is closely related to two other mycolyl transferases, each of molecular mass 32 kDa: antigen 85A and antigen 85C. All three catalyze transfer of the fatty acid mycolate from one trehalose monomycolate to another, resulting in trehalose dimycolate and free trehalose, thus helping to build the bacterial cell wall. We have determined two crystal structures of M. tuberculosis antigen 85B (ag85B), initially by molecular replacement using antigen 85C as a probe. The apo ag85B model is refined against 1.8 Angstrom data, to an R-factor of 0.196 (R-free is 0.276), and includes all residues except the N-terminal Phe. The active site immobilizes a molecule of the cryoprotectant 2-methyl-2,4-pentanediol. Crystal growth with addition of trehalose resulted in a second ag85B crystal structure (1.9 Angstrom resolution; R-factor is 0.195; R-free is 0.285). Trehalose binds in two sites at opposite ends of the active-site cleft. In our proposed mechanism model, the trehalose at the active site Ser126 represents the trehalose liberated by temporary esterification of Ser126, while the other trehalose represents the incoming trehalose monomycolate just prior to swinging over to the first trehalose site to displace the mycolate from its serine ester. Our proposed interfacial mechanism minimizes aqueous exposure of the apolar mycolates. Based on the trehalose-bound structure, we suggest a new class of antituberculous drugs, made by connecting two trehalose molecules by an amphipathic linker. (C) 2001 Academic Press. C1 Univ Calif Los Angeles, Lab Struct Biol & Mol Med, US DOE, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Sch Med, Dept Med, Los Angeles, CA 90095 USA. RP Anderson, DH (reprint author), Univ Calif Los Angeles, Lab Struct Biol & Mol Med, US DOE, Box 951570, Los Angeles, CA 90095 USA. NR 39 TC 71 Z9 74 U1 4 U2 9 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAR 23 PY 2001 VL 307 IS 2 BP 671 EP 681 DI 10.1006/jmbi.2001.4461 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 416YQ UT WOS:000167808400014 PM 11254389 ER PT J AU Roberts, RJ Varmus, HE Ashburner, M Brown, PO Eisen, MB Khosla, C Kirschner, M Nusse, R Scott, M Wold, B AF Roberts, RJ Varmus, HE Ashburner, M Brown, PO Eisen, MB Khosla, C Kirschner, M Nusse, R Scott, M Wold, B TI Information access - Building a "GenBank" of the published literature SO SCIENCE LA English DT Editorial Material C1 New England Biolabs Inc, Beverly, MA 01915 USA. Mem Sloan Kettering Canc Ctr, New York, NY 10021 USA. Univ Cambridge, Cambridge CB2 3EH, England. European Bioinformat Inst, Cambridge CB10 1SD, England. Stanford Univ, Sch Med, Stanford, CA 94305 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Harvard Univ, Sch Med, Boston, MA 02115 USA. CALTECH, Div Biol, Pasadena, CA 91125 USA. RP Roberts, RJ (reprint author), New England Biolabs Inc, 32 Tozer Rd, Beverly, MA 01915 USA. NR 0 TC 29 Z9 29 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 23 PY 2001 VL 291 IS 5512 BP 2318 EP 2319 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 413UH UT WOS:000167618700024 PM 11269300 ER PT J AU Volkman, BF Lipson, D Wemmer, DE Kern, D AF Volkman, BF Lipson, D Wemmer, DE Kern, D TI Two-state allosteric behavior in a single-domain signaling protein SO SCIENCE LA English DT Article ID ENHANCER-BINDING PROTEIN; MODEL-FREE APPROACH; BACTERIAL CHEMOTAXIS; CHEMICAL-EXCHANGE; TIME-SCALE; RELAXATION; DYNAMICS; NTRC; NMR; CALMODULIN AB Protein actions are usually discussed in terms of static structures, but function requires motion. We find a strong correlation between phosphorylation-driven activation of the signaling protein NtrC and microsecond time-scale backbone dynamics. Using nuclear magnetic resonance relaxation, we characterized the motions of NtrC in three functional states: unphosphorylated (inactive), phosphorylated (active), and a partially active mutant. These dynamics are indicative of exchange between inactive and active conformations. Both states are populated in unphosphorylated NtrC, and phosphorylation shifts the equilibrium toward the active species. These results support a dynamic population shift between two preexisting conformations as the underlying mechanism of activation. C1 Brandeis Univ, Dept Biochem, Waltham, MA 02454 USA. Univ Wisconsin, Dept Biochem, NMRFAM, Madison, WI 53706 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Volkman, BF (reprint author), Brandeis Univ, Dept Biochem, Waltham, MA 02454 USA. FU NIGMS NIH HHS [GM62117] NR 29 TC 457 Z9 459 U1 5 U2 39 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 23 PY 2001 VL 291 IS 5512 BP 2429 EP 2433 DI 10.1126/science.291.5512.2429 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 413UH UT WOS:000167618700061 PM 11264542 ER PT J AU Wu, AT Koshizuka, N AF Wu, AT Koshizuka, N TI Successful fabrication of nanostructures of convex shape on the as-prepared surfaces of Nd1Ba2Cu3Oy single crystals SO APPLIED SURFACE SCIENCE LA English DT Letter ID SCANNING TUNNELING MICROSCOPE; THIN-FILMS; SILICON SURFACES; PROBE MICROSCOPE; MANIPULATION; DESORPTION AB Recently, it was shown that the as-prepared surfaces of Nd1Ba2Cu3Oy. (Nd123) single crystals are highly stable in air. In this letter, we report our preliminary results of nanostructure fabrication of pyramids and convex lines through patterning on the surfaces of Nd123 single crystals using an ultrahigh vacuum scanning tunnelling microscope system. This opens up a new door for nanostructure engineering and device fabrications on the surfaces of high temperature superconductors. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 135, Japan. RP Wu, AT (reprint author), Jefferson Lab, Accelerator Div MS58, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 17 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAR 22 PY 2001 VL 173 IS 1-2 BP 164 EP 169 DI 10.1016/S0169-4332(00)00899-0 PG 6 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 408UJ UT WOS:000167345800021 ER PT J AU Kimmel, GA Stevenson, KP Dohnalek, Z Smith, RS Kay, BD AF Kimmel, GA Stevenson, KP Dohnalek, Z Smith, RS Kay, BD TI Control of amorphous solid water morphology using molecular beams. I. Experimental results SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GLANCING ANGLE DEPOSITION; INFRARED-SPECTRA; THIN-FILMS; ASTROPHYSICAL IMPLICATIONS; LOW-TEMPERATURES; ICY SURFACES; 150 K; CRYSTALLIZATION; TRANSITION; ADSORPTION AB The adsorption of N-2 was used to investigate the porosity/morphology of thin films of amorphous solid water. Molecular beams were used to vapor deposit amorphous solid water films on a Pt(111) crystal at a variety of incident growth angles. The amount of N-2 adsorbed by the amorphous solid water depends very sensitively on the growth angle and thermal history of the film. For normal and nearly normal incidence growth, the water films are relatively dense and smooth and adsorb only a small amount of N-2. For larger growth angles, the films are porous and adsorb large quantities of N-2 with apparent surface areas as high as similar to 2700 m(2)/g. The physical and chemical properties of amorphous solid water are of interest because of its presence in astrophysical environments. The observations have important implications for laboratory studies which use vapor deposited amorphous solid water films as analogs for astrophysical icy bodies such as comets. (C) 2001 American Institute of Physics. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Kay, BD (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, 902 Battelle Blvd,POB 999,MSN K8-88, Richland, WA 99352 USA. RI Smith, Scott/G-2310-2015; OI Smith, Scott/0000-0002-7145-1963; Kimmel, Greg/0000-0003-4447-2440; Dohnalek, Zdenek/0000-0002-5999-7867 NR 54 TC 186 Z9 186 U1 2 U2 32 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 22 PY 2001 VL 114 IS 12 BP 5284 EP 5294 DI 10.1063/1.1350580 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 409TD UT WOS:000167401000022 ER PT J AU Kimmel, GA Dohnalek, Z Stevenson, KP Smith, RS Kay, BD AF Kimmel, GA Dohnalek, Z Stevenson, KP Smith, RS Kay, BD TI Control of amorphous solid water morphology using molecular beams. II. Ballistic deposition simulations SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GLANCING ANGLE DEPOSITION; THIN-FILMS; GROWTH AB Ballistic deposition simulations of thin film growth were performed. The results of the simulations are compared to experiments of N-2 adsorption by porous amorphous solid water thin films. The simulations are in qualitative agreement with the experimental observations: The porosity of the thin films is controlled by using a collimated beam to vapor deposit the films. Films with normal or near normal growth angles (theta similar to0 degrees) are relatively dense and smooth. Films with larger growth angles are highly porous and the average pore size increases as the growth angle increases. The simulations indicate that for growth angles greater than similar to 70 degrees, adsorption into the largest pores is not possible leading to the experimentally observed maximum in N-2 adsorption by porous amorphous solid water at theta = 70 degrees. (C) 2001 American Institute of Physics. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Kay, BD (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, 902 Battelle Blvd,POB 999 MSN K8-88, Richland, WA 99352 USA. RI Smith, Scott/G-2310-2015; OI Smith, Scott/0000-0002-7145-1963; Kimmel, Greg/0000-0003-4447-2440; Dohnalek, Zdenek/0000-0002-5999-7867 NR 18 TC 89 Z9 89 U1 2 U2 13 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 22 PY 2001 VL 114 IS 12 BP 5295 EP 5303 DI 10.1063/1.1350581 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 409TD UT WOS:000167401000023 ER PT J AU Liu, JB Hochlaf, M Chambaud, G Rosmus, P Ng, CY AF Liu, JB Hochlaf, M Chambaud, G Rosmus, P Ng, CY TI High resolution pulsed field ionization-photoelectron bands for CS2+((A)over-tilde(2)pi(u)): An experimental and theoretical study SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID ADVANCED LIGHT-SOURCE; SYNCHROTRON-RADIATION; ENERGY-RANGE; RESOLVED PHOTOELECTRON; VARIATIONAL METHOD; CHEMICAL-DYNAMICS; CARBON-DISULFIDE; PHOTO-IONIZATION; SCF METHOD; SPECTROSCOPY AB The vacuum ultraviolet pulsed field ionization-photoelectron (PFI-PE) spectra for CS2 were measured in the full energy range of 12.6-13.5 eV, revealing complex vibronic band structures for the CS2+((A) over tilde (2)Pi (u)) state. Three-dimensional potential energy functions (PEFs) for CS2+((A) over tilde (2)Pi (u)) were also generated theoretically using the complete active space self-consistent field and internally contracted multireference configuration interaction methods. Using these PEFs, the harmonic frequencies, anharmonic constants, and Renner-Teller rovibronic energy levels for CS2+((A) over tilde (2)Pi (u)) were calculated variationally. Many Fermi polyads have been identified in the rovibronic states of CS2+((A) over tilde (2)Pi (u)). Using present theoretical and available optical data, we assigned most of the PFI-PE rovibronic bands due to excitation of the v(1)(+) (symmetric stretching), v(2)(+) (bending), and v(3)(+) (asymmetric stretching) modes for CS2+((A) over tilde (2)Pi (u)). The simulation of rotational contours resolved in the high-resolution PFI-PE bands for CS2+((A) over tilde (2)Pi (u)); v(2)(+) = 0-3, v(2)(+) = 0,2, v(3)(+) = 0) provided accurate ionization energies for the formation of these states from CS2((X) over tilde (1)Sigma (+)(g)). C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Marne La Vallee, Theoret Chem Grp, F-77454 Marne La Vallee, France. RP Ng, CY (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. NR 56 TC 18 Z9 18 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 22 PY 2001 VL 105 IS 11 BP 2183 EP 2191 DI 10.1021/jp001998n PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 413VN UT WOS:000167632400007 ER PT J AU Skokov, S Zou, SL Bowman, JM Allison, TC Truhlar, DG Lin, YJ Ramachandran, B Garrett, BC Lynch, BJ AF Skokov, S Zou, SL Bowman, JM Allison, TC Truhlar, DG Lin, YJ Ramachandran, B Garrett, BC Lynch, BJ TI Thermal and state-selected rate coefficients for the O(P-3)+HCl reaction and new calculations of the barrier height and width SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID POTENTIAL-ENERGY SURFACE; CHEMICAL-REACTION RATES; RATE-CONSTANT CALCULATIONS; QUANTUM REACTION DYNAMICS; ATOM-TRANSFER-REACTIONS; PARTIAL CROSS-SECTIONS; PLUS HCL REACTION; TRAJECTORY CALCULATIONS; CONFIGURATION-INTERACTION; COMPUTER-PROGRAM AB This paper compares several approximate methods for calculating rate coefficients for the O(P-3) + HCl reaction to presumably more accurate quantum mechanical calculations that an based on applying the J-shifting approximation (QM/JS) to an accurate cumulative reaction probability for J = O, All calculations for this work employ the recent S4 potential energy surface, which presents a number of challenges for the approximate methods. The O + HCl reaction also poses a significant challenge to computational dynamics because of the heavy-light-heavy mass combination and the broad noncollinear reaction path. The approximate methods for calculating the thermal rate coefficient that are examined in this article are quasiclassical trajectories (QCT), conventional transition state theory (TST), variational transition state theory employing the improved canonical variational theory (ICVT), ICVT with the microcanonical optimized multidimensional tunneling correction (ICVT/mu OMT), and reduced dimensionality quantum mechanical calculations based on adiabatic bend and J-shifting (QM/AB-JS) approximations. It is seen that QCT, TST, and ICVT rate coefficients agree with each other within a factor of 2.7 at 250 K and 1.6 at 1000 K, whereas inclusion of tunneling by the ICVT/mu OMT, QM/AB-JS, or QM/JS methods increases the late coefficients considerably. However, the ICVT/mu OMT and QM/AB-JS methods yield significantly lower rate coefficients than the QM/JS calculations, especially at lower temperatures. We also report and discuss calculations for the state-selected reaction of O(P-3) with HCl in the first excited vibrational state. In addition to the dynamics calculations, we report new electronic structure calculations by the Multi-Coefficient Gaussian-3 (MCG3) method that indicate that one possible source of disagreement between the QM/JS rate coefficients and experiment is that the barrier on the S4 surface may be too narrow. C1 Emory Univ, Dept Chem, Atlanta, GA 30322 USA. Natl Inst Stand & Technol, Expt Kinet & Thermodynam Grp, Gaithersburg, MD 20899 USA. Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA. Univ Minnesota, Inst Supercomp, Minneapolis, MN 55455 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Bowman, JM (reprint author), Emory Univ, Dept Chem, 1515 Pierce Dr, Atlanta, GA 30322 USA. RI Garrett, Bruce/F-8516-2011; Truhlar, Donald/G-7076-2015; OI Truhlar, Donald/0000-0002-7742-7294; Ramachandran, Bala/0000-0002-5179-5750 NR 89 TC 19 Z9 19 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 22 PY 2001 VL 105 IS 11 BP 2298 EP 2307 DI 10.1021/jp003783j PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 413VN UT WOS:000167632400023 ER PT J AU Hankel, M Balint-Kurti, GG Gray, SK AF Hankel, M Balint-Kurti, GG Gray, SK TI Quantum mechanical calculation of reaction probabilities and branching ratios for the O(D-1)+HD -> OH(OD)+D(H) reaction on the (X)over-tilde(1)A ' and 1(1)A '' adiabatic potential energy surfaces SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID STATE-RESOLVED STEREODYNAMICS; PLUS DIATOM SYSTEMS; WAVE-PACKET; REACTION DYNAMICS; CROSS-SECTIONS; RATE CONSTANTS; MOLECULAR PHOTOFRAGMENTATION; O(D-1)+H-2->OH+H REACTION; SCHRODINGER-EQUATION; SCATTERING-THEORY AB The real wave packet method is used to calculate state-to-state reaction probabilities and branching ratios for the reaction O(D-1) + KD --> OH(OD) + D(H) for zero total angular momentum. Calculations are performed on the adiabatic potential energy surfaces corresponding to the (X) over tilde (1)A ' and 1(1)A " electronic states. Vibrational state-to-state cross sections, product state distributions and branching ratios are estimated using a capture model and J-shifting methods. The results are compared with experiment and with results of quasi-classical trajectory calculations. C1 Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Balint-Kurti, GG (reprint author), Univ Bristol, Sch Chem, Cantocks Close, Bristol BS8 1TS, Avon, England. RI Hankel, Marlies/C-6262-2009 OI Hankel, Marlies/0000-0002-8297-7231 NR 69 TC 45 Z9 46 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 22 PY 2001 VL 105 IS 11 BP 2330 EP 2339 DI 10.1021/jp003772q PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 413VN UT WOS:000167632400027 ER PT J AU Datz, S AF Datz, S TI Dynamics of dissociative recombination of molecular ions: Three-body breakup of triatomic di-hydrides SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID BRANCHING FRACTIONS; STORAGE-RINGS; STATE; WATER AB An electron, recombining with a molecular ion, deposits the negative of the ionization potential into the system and leads to dissociation into atomic and/or molecular fragments (dissociative recombination (DR)). Recent studies using heavy-ion storage rings have done much to elucidate the process. Relative collision energies as low as similar to1 meV are obtained, and information has been gained on total cross sections (rates), fragment branching fractions, and atomic states in DR of diatomic molecules. Tri-atomic di-hydrides (H-3(+), CH2+, NH2+, OH2+) show a propensity for dissociation into three fragments. To study the dynamics of this process, a new method has been used to obtain atomic excitation levels, distribution of energy, and angular distribution of the fragments. The case study of H2O+ has been completed and is discussed. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Datz, S (reprint author), Oak Ridge Natl Lab, Div Phys, POB 2008, Oak Ridge, TN 37831 USA. NR 16 TC 4 Z9 4 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 22 PY 2001 VL 105 IS 11 BP 2369 EP 2373 DI 10.1021/jp003466c PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 413VN UT WOS:000167632400032 ER PT J AU Andres, E Askebjer, P Bai, X Barouch, G Barwick, SW Bay, TC Becker, KH Bergstrom, L Bertrand, D Bierenbaum, D Biron, A Booth, J Botner, O Bouchta, A Boyce, MM Carius, S Chen, A Chirkin, D Conrad, J Cooley, J Costa, CGS Cowen, DF Dailing, J Dalberg, E DeYoung, T Desiati, P Dewulf, JP Doksus, P Edsjo, J Ekstrom, P Erlandsson, B Feser, T Gaug, M Goldschmidt, A Goobar, A Gray, L Haase, H Hallgren, A Halzen, F Hanson, K Hardtke, R He, YD Hellwig, M Heukenkamp, H Hill, GC Hulth, PO Hundertmark, S Jacobsen, J Kandhadai, V Karle, A Kim, J Koci, B Kopke, L Kowalski, M Leich, H Leuthold, M Lindal, P Liubarsky, I Loaiza, P Lowder, DM Ludvig, J Madsen, J Marciniewski, P Matis, HS Mihalyi, A Mikolajski, T Miller, TC Minaeva, Y Miocinovic, P Mock, PC Morse, R Neunhoffer, T Newcomer, FM Niessen, P Nygren, DR Ogelman, H de los Heros, CP Porrata, R Price, PB Rawlins, K Reed, C Rhode, W Richards, A Richter, S Martino, JR Romenesko, P Ross, D Rubinstein, H Sander, HG Scheider, T Schmidt, T Schneider, D Schneider, E Schwarz, R Silvestri, A Solarz, M Spiczak, GM Spiering, C Starinsky, N Steele, D Steffen, P Stokstad, RG Usechak, N Vander Donckt, M Walck, C Weinheimer, C Wiebusch, CH Wischnewski, R Wissing, H Woschnagg, K Wu, W Yodh, G Young, S AF Andres, E Askebjer, P Bai, X Barouch, G Barwick, SW Bay, TC Becker, KH Bergstrom, L Bertrand, D Bierenbaum, D Biron, A Booth, J Botner, O Bouchta, A Boyce, MM Carius, S Chen, A Chirkin, D Conrad, J Cooley, J Costa, CGS Cowen, DF Dailing, J Dalberg, E DeYoung, T Desiati, P Dewulf, JP Doksus, P Edsjo, J Ekstrom, P Erlandsson, B Feser, T Gaug, M Goldschmidt, A Goobar, A Gray, L Haase, H Hallgren, A Halzen, F Hanson, K Hardtke, R He, YD Hellwig, M Heukenkamp, H Hill, GC Hulth, PO Hundertmark, S Jacobsen, J Kandhadai, V Karle, A Kim, J Koci, B Kopke, L Kowalski, M Leich, H Leuthold, M Lindal, P Liubarsky, I Loaiza, P Lowder, DM Ludvig, J Madsen, J Marciniewski, P Matis, HS Mihalyi, A Mikolajski, T Miller, TC Minaeva, Y Miocinovic, P Mock, PC Morse, R Neunhoffer, T Newcomer, FM Niessen, P Nygren, DR Ogelman, H de los Heros, CP Porrata, R Price, PB Rawlins, K Reed, C Rhode, W Richards, A Richter, S Martino, JR Romenesko, P Ross, D Rubinstein, H Sander, HG Scheider, T Schmidt, T Schneider, D Schneider, E Schwarz, R Silvestri, A Solarz, M Spiczak, GM Spiering, C Starinsky, N Steele, D Steffen, P Stokstad, RG Usechak, N Vander Donckt, M Walck, C Weinheimer, C Wiebusch, CH Wischnewski, R Wissing, H Woschnagg, K Wu, W Yodh, G Young, S TI Observation of high-energy neutrinos using Cerenkov detectors embedded deep in Antarctic ice SO NATURE LA English DT Article ID ASTRONOMY; MUONS; FLUX AB Neutrinos are elementary particles that carry no electric charge and have little mass. As they interact only weakly with other particles, they can penetrate enormous amounts of matter, and therefore have the potential to directly convey astrophysical information from the edge of the Universe and from deep inside the most cataclysmic high-energy regions(1). The neutrino's great penetrating power, however, also makes this particle difficult to detect. Underground detectors have observed low-energy neutrinos from the Sun and a nearby supernova(2), as well as neutrinos generated in the Earth's atmosphere. But the very low fluxes of high-energy neutrinos from cosmic sources can be observed only by much larger, expandable detectors in, for example, deep water(3,4) or ice(5). Here we report the detection of upwardly propagating atmospheric neutrinos by the ice-based Antarctic muon and neutrino detector array (AMANDA). These results establish a technology with which to build a kilometre-scale neutrino observatory necessary for astrophysical observations(1). C1 Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Univ Stockholm, Fysikum, S-11385 Stockholm, Sweden. Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA. Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Berg Univ Gesamthsch Wuppertal, Fachbereich Phys 8, D-42097 Wuppertal, Germany. Free Univ Brussels, Fac Sci, B-1050 Brussels, Belgium. DESY Zeuthen, D-15735 Zeuthen, Germany. Univ Uppsala, Dept Radiat Sci, S-75121 Uppsala, Sweden. Kalmar Univ, Dept Technol, S-39129 Kalmar, Sweden. Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. Univ Mainz, Inst Phys, D-55099 Mainz, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA. RP Halzen, F (reprint author), Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA. RI Wiebusch, Christopher/G-6490-2012; Kowalski, Marek/G-5546-2012; Hundertmark, Stephan/A-6592-2010; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; GAug, Markus/L-2340-2014; OI Wiebusch, Christopher/0000-0002-6418-3008; GAug, Markus/0000-0001-8442-7877; Perez de los Heros, Carlos/0000-0002-2084-5866 NR 20 TC 153 Z9 155 U1 1 U2 11 PU MACMILLAN PUBLISHERS LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 22 PY 2001 VL 410 IS 6827 BP 441 EP 443 DI 10.1038/35068509 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 412YX UT WOS:000167583800033 PM 11260705 ER PT J AU Krusin-Elbaum, L Shibauchi, T Argyle, B Gignac, L Weller, D AF Krusin-Elbaum, L Shibauchi, T Argyle, B Gignac, L Weller, D TI Stable ultrahigh-density magnetooptical recordings using introduced linear defects SO NATURE LA English DT Article ID DATA-STORAGE; ANISOTROPY; FILMS; MICROSCOPY; VORTICES; CREEP AB The stability of data bits in magnetic recording media(1,2) at ultrahigh densities is compromised by the thermal 'flips'-magnetic spin reversals-of nano-sized spin domains(3), which erase the stored information. Media that are magnetized perpendicular to the plane of the film, such as ultrathin cobalt films or multilayered structures(4,5), are more stable against thermal self-erasure(2,6) than conventional memory devices. In this context, magnetooptical memories seem particularly promising for ultrahigh-density recording on portable disks, and bit densities of similar to 100 Gbit inch(-2) (ref. 7) have been demonstrated using recent advances in the bit writing and reading techniques(7-11). But the roughness and mobility of the magnetic domain walls(12,13) prevents closer packing of the magnetic bits, and therefore presents a challenge to reaching even higher bit densities. Here we report that the strain imposed by a linear defect in a magnetic thin film can smooth rough domain walls over regions hundreds of micrometres in size, and halt their motion. A scaling analysis of this process, based on the generic physics of disorder-controlled elastic lines(14-17), points to a simple way by which magnetic media might be prepared that can store data at densities in excess of 1 Tbit inch(-2). C1 IBM Corp, Thomas J Watson Res Ctr, Yorktown Heights, NY 10598 USA. Univ Calif Los Alamos Natl Lab, MST STC, Los Alamos, NM 87545 USA. IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA. RP Krusin-Elbaum, L (reprint author), IBM Corp, Thomas J Watson Res Ctr, Yorktown Heights, NY 10598 USA. RI Shibauchi, Takasada/B-9349-2008 OI Shibauchi, Takasada/0000-0001-5831-4924 NR 24 TC 101 Z9 101 U1 1 U2 16 PU MACMILLAN PUBLISHERS LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 22 PY 2001 VL 410 IS 6827 BP 444 EP 446 DI 10.1038/35068515 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 412YX UT WOS:000167583800034 PM 11260706 ER PT J AU Huovinen, P Kolb, PF Heinz, U Ruuskanen, PV Voloshin, SA AF Huovinen, P Kolb, PF Heinz, U Ruuskanen, PV Voloshin, SA TI Radial and elliptic flow at RHIC: further predictions SO PHYSICS LETTERS B LA English DT Article DE relativistic heavy-ion collisions; elliptic flow; hydrodynamic model ID CENTRALITY DEPENDENCE; PARTICLE DISTRIBUTIONS; NUCLEAR COLLISIONS; PHASE-TRANSITION; TRANSVERSE FLOW; HADRON; SIGNATURE; EXPANSION; SPECTRA AB Using a hydrodynamic model, we predict the transverse momentum dependence of the spectra and the elliptic Row for different hadrons in Au+Au collisions at roots = 130 A GeV. The dependence of the differential and p(t)-integrated elliptic flow on the hadron mass, equation of state and freeze-out temperature is studied both numerically and analytically. (C) 2001 Published by Elsevier Science B.V. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. Univ Jyvaskyla, Dept Phys, FIN-40341 Jyvaskyla, Finland. Wayne State Univ, Dept Phys & Astron, Detroit, MI 48202 USA. RP Huovinen, P (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Voloshin, Sergei/I-4122-2013 NR 26 TC 617 Z9 619 U1 3 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 22 PY 2001 VL 503 IS 1-2 BP 58 EP 64 DI 10.1016/S0370-2693(01)00219-2 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 415AJ UT WOS:000167698100006 ER PT J AU Kopeliovich, BZ Raufeisen, J Tarasov, AV AF Kopeliovich, BZ Raufeisen, J Tarasov, AV TI The color dipole picture of the Drell-Yan process SO PHYSICS LETTERS B LA English DT Article DE Drell-Yan process; dipole cross section; low X ID DEEP-INELASTIC-SCATTERING; MUON PAIRS; SATURATION; PROTON; PIONS; QCD AB At high energies, Drell-Yan (DY) dilepton production viewed in the target rest frame should be interpreted as bremsstrahlung and can be expressed in terms of the same color dipole cross section as DIS. We compute DY cross sections on a nucleon target with the realistic parameterization for the dipole cross section saturated at large separations. The results are compared to experimental data and predictions for RHIC are presented. The transverse momentum distribution of the DY process is calculated and energy growth is expected to be steeper at large than at small transverse momenta. We also calculate the DY angular distribution and investigate deviations from the 1 + cos(2) theta shape. (C) 2001 Published by Elsevier Science B.V. C1 Max Planck Inst Kernphys, D-69029 Heidelberg, Germany. Univ Calif Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. Univ Heidelberg, Inst Theoret Phys, D-69120 Heidelberg, Germany. Joint Inst Nucl Res, Dubna 141980, Moscow Reg, Russia. RP Kopeliovich, BZ (reprint author), Max Planck Inst Kernphys, Postfach 103980, D-69029 Heidelberg, Germany. NR 24 TC 60 Z9 60 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 22 PY 2001 VL 503 IS 1-2 BP 91 EP 98 DI 10.1016/S0370-2693(01)00214-3 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 415AJ UT WOS:000167698100012 ER PT J AU Kauer, N Plehn, T Rainwater, D Zeppenfeld, D AF Kauer, N Plehn, T Rainwater, D Zeppenfeld, D TI H -> WW as the discovery mode for a light Higgs boson SO PHYSICS LETTERS B LA English DT Article ID WW DECAY MODE; CERN LHC; HADRON SUPERCOLLIDERS; MASS; SCATTERING; SIGNATURE; COUPLINGS; PHYSICS; SEARCH; MSSM AB The production cross section for a m(H) approximate to 115 GeV, SM Higgs boson in weak boson fusion at the LHC is sizable. However, the branching fraction for H --> W+ W- is expected to be relatively small. The signal, with its two forward jets, is sufficiently different from the main backgrounds that a signal to background ratio of better than 1 : 1 can nevertheless be obtained, with large enough rate to allow for a 5 sigma signal with 35 fb(-1) of data. The H --> WW signal in weak boson fusion may thus prove to be the discovery mode for the Higgs boson at the LHC. (C) 2001 Published by Elsevier Science B.V. C1 Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kauer, N (reprint author), Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA. OI rainwater, david/0000-0002-3668-4331 NR 39 TC 133 Z9 134 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 22 PY 2001 VL 503 IS 1-2 BP 113 EP 120 DI 10.1016/S0370-2693(01)00211-8 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 415AJ UT WOS:000167698100015 ER PT J AU Androsch, R Wunderlich, B AF Androsch, R Wunderlich, B TI Reversibility of melting and crystallization of indium as a function of the heat conduction path SO THERMOCHIMICA ACTA LA English DT Article DE melting; crystallization; indium; DSC; TMDSC; Fourier transformation; integral analysis ID DIFFERENTIAL SCANNING CALORIMETRY; TEMPERATURE-MODULATED CALORIMETRY; FIRST-ORDER TRANSITIONS; X-RAY-SCATTERING; CAPACITY MEASUREMENTS; DSC; POLY(ETHYLENE-CO-OCTENE); POLYETHYLENE; POLYMERS; MODEL AB The melting and crystallization behavior of indium has been investigated by temperature-modulated, differential scanning calorimetry as a function of thermal resistance between the heater/sensor and the sample, and as a function of the modulation parameters using a heater-controlled, heat-Aux calorimeter. The thermal resistance between the heater/sensor and the indium sample was varied by placing the indium above polymer layers of different thickness. This results in apparent shifts of the onset of melting to higher temperatures and a striking reduction of the apparent degree of reversibility of melting with increasing thermal resistance. The apparent degree of reversibility is judged by an integral analysis of the modulated and total heat-flow rate, not the reversing, complex heat capacity, which is ill suited for the description of the melting process. The modulation frequency and amplitude have larger effects on the total and reversing heat-Row rate if the thermal resistance is low. A change in thermal resistance can transform a known reversible process that is coupled with a large latent heat, to an apparently non-reversing one. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Halle Wittenberg, Inst Mat Sci, D-06217 Merseburg, Germany. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Androsch, R (reprint author), Univ Halle Wittenberg, Inst Mat Sci, Geusaer Str, D-06217 Merseburg, Germany. NR 36 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD MAR 22 PY 2001 VL 369 IS 1-2 BP 67 EP 78 DI 10.1016/S0040-6031(00)00728-0 PG 12 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 417PU UT WOS:000167844000009 ER PT J AU Marx, DT Policandriotes, T Zhang, S Scott, J Dinwiddie, RB Wang, H AF Marx, DT Policandriotes, T Zhang, S Scott, J Dinwiddie, RB Wang, H TI Measurement of interfacial temperatures during testing of a subscale aircraft brake SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article AB Interfacial temperatures have been measured using fibre optic inserts in the stationary brake ring during ring-on-ring, subscale dynamometer aircraft brake testing. The brake materials are carbon fibre-reinforced, carbon-matrix (carbon-carbon) composites. The temperature distribution varies with dynamometer test conditions and demonstrates the non-uniformity of contact pressure within the interface. A two-dimensional. axis-symmetric finite element model (FEM) is presented that is used to estimate temperature profiles during braking using either a constant pressure or constant energy flux assumption. The model incorporates the measured temperature-dependence of the thermal diffusivity and specific heat capacity for the composite materials. The surface temperatures obtained from the FEM are compared with the measured surface temperatures. Substantial differences between the two results are observed and discussed. C1 So Illinois Univ, Ctr Adv Frict Studies, Carbondale, IL 62901 USA. Oak Ridge Natl Lab, High Temp Mat Lab, Oak Ridge, TN 37831 USA. RP Marx, DT (reprint author), So Illinois Univ, Ctr Adv Frict Studies, Carbondale, IL 62901 USA. RI Wang, Hsin/A-1942-2013; OI Wang, Hsin/0000-0003-2426-9867; Dinwiddie, Ralph/0000-0003-1670-470X NR 11 TC 4 Z9 5 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD MAR 21 PY 2001 VL 34 IS 6 BP 976 EP 984 DI 10.1088/0022-3727/34/6/320 PG 9 WC Physics, Applied SC Physics GA 421VW UT WOS:000168085100021 ER PT J AU Schafer, LL Tilley, TD AF Schafer, LL Tilley, TD TI Efficient diastereoselective syntheses of chiral macrocycles via zirconocene coupling. Synthetic control of size and geometry SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ASYMMETRIC CATALYSIS; RECOGNITION; EPOXIDATION; HYDROXYLATION; POLYMERS; ROUTE C1 Univ Calif Berkeley, Dept Chem, Ctr New Direct ORgan Synth, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Tilley, TD (reprint author), Univ Calif Berkeley, Dept Chem, Ctr New Direct ORgan Synth, Berkeley, CA 94720 USA. NR 20 TC 37 Z9 37 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 21 PY 2001 VL 123 IS 11 BP 2683 EP 2684 DI 10.1021/ja015509o PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 413VU UT WOS:000167632900033 PM 11456946 ER PT J AU Amarian, M Asryan, G Beard, K Brooks, W Burkert, V Carstens, T Coleman, A Demirchyan, R Efremenko, Y Egiyan, H Egiyan, K Funsten, H Gavrilov, V Giovanetti, K Marshall, RM Mecking, B Minehart, RC Mkrtchan, H Ohandjanyan, M Sharabian, Y Smith, LC Stepanyan, S Stephens, WA Tung, TY Zorn, C AF Amarian, M Asryan, G Beard, K Brooks, W Burkert, V Carstens, T Coleman, A Demirchyan, R Efremenko, Y Egiyan, H Egiyan, K Funsten, H Gavrilov, V Giovanetti, K Marshall, RM Mecking, B Minehart, RC Mkrtchan, H Ohandjanyan, M Sharabian, Y Smith, LC Stepanyan, S Stephens, WA Tung, TY Zorn, C TI The CLAS forward electromagnetic calorimeter SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE CLAS; calorimeter; calibration; scintillator AB The CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab utilizes six iron-free superconducting coils to provide an approximately toroidal magnetic field. The six sectors are instrumented individually to form six independent spectrometers. The forward region (8 degrees < < 45) of each sector is equipped with a lead-scintillator electromagnetic sampling calorimeter (EC), 16 radiation lengths thick, using a novel triangular geometry with stereo readout. With its good energy and position resolution, the EC is used to provide the primary electron trigger for CLAS. It is also used to reject pions, reconstruct pi degrees and eta decays and detect neutrons. This paper treats the design, construction and performance of the calorimeter. (C) 2001 Elsevier Science B.V. Ail rights reserved. C1 Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA. YerPi, Yerevan, Armenia. Coll William & Mary, Williamsburg, VA 23185 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. ITEP, Moscow, Russia. James Madison Univ, Harrisonburg, VA 22807 USA. RP Smith, LC (reprint author), Univ Virginia, Dept Phys, McCormick Rd, Charlottesville, VA 22901 USA. RI Brooks, William/C-8636-2013 OI Brooks, William/0000-0001-6161-3570 NR 17 TC 44 Z9 45 U1 1 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 MAR 21 PY 2001 VL 460 IS 2-3 BP 239 EP 265 DI 10.1016/S0168-9002(00)00996-7 PG 27 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 417LK UT WOS:000167836300004 ER PT J AU Koehler, PE AF Koehler, PE TI Comparison of white neutron sources for nuclear astrophysics experiments using very small samples SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE neutron sources; nuclear astrophysics ID CROSS-SECTION; CAPTURE; ENERGY; ORELA; NUCLEOSYNTHESIS; RESOLUTION; DETECTOR; LANSCE AB The purpose of this paper is to compare the relative merits of four white neutron source facilities for nuclear astrophysics experiments. The lour facilities are the Oak Ridge Electron Linear Accelerator, the Manuel Lujan Jr. Neutron Scattering Center, the CERN-TOF facility, and the Oak Ridge Spallation Neutron Source. The criteria for this comparison are based on experiments designed to determine astrophysical rates for neutron-induced reactions using radioactive as well as very small stable samples - areas largely unexplored at present. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Dept Phys, Oak Ridge, TN 37831 USA. RP Koehler, PE (reprint author), Oak Ridge Natl Lab, Dept Phys, POB 2008,Bldg 6010, Oak Ridge, TN 37831 USA. EM koehlerpe@ornl.gov OI Koehler, Paul/0000-0002-6717-0771 NR 31 TC 16 Z9 16 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 MAR 21 PY 2001 VL 460 IS 2-3 BP 352 EP 361 DI 10.1016/S0168-9002(00)01065-2 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 417LK UT WOS:000167836300014 ER PT J AU Wang, DQ Santisteban, JR Edwards, L AF Wang, DQ Santisteban, JR Edwards, L TI Effect of wavelength-dependent attenuation on strain measurement using pulsed neutron diffraction SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE neutron; strain; wavelength-dependent attenuation; systematic error; Bragg edge; transmission ID RIETVELD REFINEMENT AB The measurement of stresses in engineering components and structures by neutron diffraction has traditionally been limited to depths of a few centimetres. However, recent developments in instrumentation open up the possibility of deeper measurements. It has been suggested that a systematic error may occur when measuring stresses deep in materials due to wavelength-dependent attenuation of the incident and/or diffracted beam. A series of experiments to evaluate the magnitude of this effect on ENGIN, a pulsed neutron strain scanner will be presented in this paper. It was found that the pseudo-strains induced by the attenuation of the diffracted beam were negligible, whereas there was a small but still noticeable effect produced by the attenuation in the incident beam. The possible causes of this shift and the consequences for deep measurements are discussed. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Open Univ, Fac Technol, Dept Mat Engn, Milton Keynes MK7 6AA, Bucks, England. RP Wang, DQ (reprint author), Oak Ridge Natl Lab, High Temp Mat Lab, Oak Ridge, TN 37831 USA. RI Edwards, Lyndon/D-1916-2013 OI Edwards, Lyndon/0000-0001-7526-6020 NR 10 TC 3 Z9 3 U1 1 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 MAR 21 PY 2001 VL 460 IS 2-3 BP 381 EP 390 DI 10.1016/S0168-9002(00)01122-0 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 417LK UT WOS:000167836300018 ER PT J AU Auerbach, JM Wegner, PJ Couture, SA Eimerl, D Hibbard, RL Milam, D Norton, MA Whitman, PK Hackel, LA AF Auerbach, JM Wegner, PJ Couture, SA Eimerl, D Hibbard, RL Milam, D Norton, MA Whitman, PK Hackel, LA TI Modeling of frequency doubling and tripling with measured crystal spatial refractive-index nonuniformities SO APPLIED OPTICS LA English DT Article ID NATIONAL-IGNITION-FACILITY; 2ND-HARMONIC GENERATION; HARMONIC-GENERATION; LASER-BEAMS; CONVERSION; KDP AB Efficient frequency doubling and tripling are critical to the successful operation of inertial confinement fusion laser systems such as the National Ignition Facility currently being constructed at the Lawrence Livermore National Laboratory and the Omega laser at the Laboratory for Laser Energetics. High-frequency conversion efficiency is strongly dependent on attainment of the phase-matching condition. In an ideal converter crystal, one can obtain the phase-matching condition throughout by angle tuning or temperature tuning of the crystal as a whole. In real crystals, imperfections in the crystal structure prohibit the attainment of phase matching at all locations in the crystal. We have modeled frequency doubling and tripling with a quantitative measure of this departure from phase matching in real crystals. This measure is obtained from interferometry of KDP and KD*P crystals at two orthogonal light polarizations. (C) 2001 Optical Society of America. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Auerbach, JM (reprint author), Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94551 USA. EM auerbach1@llnl.gov RI Whitman, Pamela/B-2336-2013 NR 17 TC 22 Z9 27 U1 0 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1559-128X EI 2155-3165 J9 APPL OPTICS JI Appl. Optics PD MAR 20 PY 2001 VL 40 IS 9 BP 1404 EP 1411 DI 10.1364/AO.40.001404 PG 8 WC Optics SC Optics GA 413RX UT WOS:000167626700015 PM 18357129 ER PT J AU Neuforge-Verheecke, C Goriely, S Guzik, JA Swenson, FJ Bradley, PA AF Neuforge-Verheecke, C Goriely, S Guzik, JA Swenson, FJ Bradley, PA TI Seismological tests of solar models calculated with the NACRE reaction rates and the Grevesse and Sauval 1998 mixture SO ASTROPHYSICAL JOURNAL LA English DT Article DE nuclear reactions, nucleosynthesis, abundances; Sun : abundances; Sun : interior; Sun : oscillations ID THERMONUCLEAR REACTION-RATES; ELEMENT DIFFUSION; NEUTRINO EXPERIMENTS; CROSS-SECTIONS; BISON DATA; FREQUENCIES; SPECTRUM; INTERIOR; HELIUM; FLUXES AB We examine the effects of the Grevesse & Sauval solar mixture and the European Nuclear Astrophysics Compilation of Reaction Rates (NACRE) nuclear reaction rates on the calculated neutrino fluxes and the p-mode oscillation spectrum of calibrated standard solar models. Calibrated solar models with the NACRE reaction rates are in good agreement with the helioseismic constraints, i.e., the low-degree p-mode oscillation spectrum, the small frequency separations, the depth of the convection zone, and the helium abundance in the convection zone. The use of the Grevesse & Sauval solar mixture slightly worsens the agreement by producing a shallower convection zone. We exploit the uncertainties in abundance determinations, the nuclear reaction rates, and the neutrino capture rates to reduce the predicted neutrino fluxes: the predicted B-8 flux can be brought well within the observational error bars of the Kamiokande experiment. The predicted chlorine and gallium event rates, though still higher than the observational values, are reduced by 47% and 24%, respectively. The models with the neutrino flux reductions do about as well as the reference model in satisfying the current constraints of helioseismology. We also perform g-mode calculations : these modes are much more sensitive to the core structure than the p-modes. Confirmed detection and identification of only one g-mode, with an accuracy of within only 1/10 of 1% on its period, would be enough to discriminate between our different models and assess the extent to which standard physics is able to give a partial answer to the neutrino problems. C1 Univ Calif Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA. Free Univ Brussels, Inst Astron & Astrophys CP226, B-1050 Brussels, Belgium. RP Neuforge-Verheecke, C (reprint author), Univ Calif Los Alamos Natl Lab, Div Appl Phys, X-2 MS B220, Los Alamos, NM 87545 USA. NR 50 TC 10 Z9 10 U1 0 U2 1 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 MAR 20 PY 2001 VL 550 IS 1 BP 493 EP 502 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 417YN UT WOS:000167863200045 ER PT J AU Fournier, KB Finkenthal, M Pacella, D May, MJ Leigheb, M Soukhanovskii, V Goldstein, WH AF Fournier, KB Finkenthal, M Pacella, D May, MJ Leigheb, M Soukhanovskii, V Goldstein, WH TI Measurement of M-shell iron ionization balance in a tokamak plasma SO ASTROPHYSICAL JOURNAL LA English DT Article DE atomic data; methods : laboratory; stars : coronae; ultraviolet : stars ID STELLAR CORONAL ABUNDANCES; FUSION PLASMAS; ULTRAVIOLET; SPECTRUM; SOLAR; COEFFICIENTS; SPECTROMETER; SPECTROSCOPY; EMISSION; REGION AB We present the Deltan = 0 (n = 3 to n = 3) EUV spectra of M-shell iron ions from a tokamak plasma obtained during the "ramp- down" phase of the discharge. The fractional ion abundances for K-like Fe+7 to Si-like Fe+12 are found from fitting model spectra to the measured spectrum. The plasma temperature is measured as a function of position by Thomson scattering of laser light and Langmuir probes. Collisional-radiative simulations have been computed for the above ions, using atomic data generated with the HULLAC suite of codes. The blended M-shell spectrum is strongly sensitive to temperature; this makes it a potentially useful diagnostic for observations of stellar coronae where the differential emission measure is dominated by temperatures around 1 MK. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Fournier, KB (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-41, Livermore, CA 94551 USA. NR 29 TC 10 Z9 10 U1 0 U2 1 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 MAR 20 PY 2001 VL 550 IS 1 BP L117 EP L120 DI 10.1086/319483 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 413GZ UT WOS:000167605400026 ER PT J AU Martin, JE AF Martin, JE TI Field-induced rheology in uniaxial and biaxial fields SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT 7th International Conference on Electro-Rheological Fluids and Magneto-Rheological Suspension CY JUL 09-23, 1999 CL HONOLULU, HI ID ELECTRORHEOLOGICAL FLUIDS; OSCILLATORY SHEAR; SUSPENSIONS; SIMULATION; DYNAMICS; MODEL; FLOW AB Steady and oscillatory shear 3-D simulations of electro- and magnetorheology in uniaxial and biaxial fields are presented, and compared to the predictions of the chain model. These large scale simulations are three dimensional, and include the effect of Brownian motion. In the absence of thermal fluctuations, the expected shear thinning viscosity is observed in steady shear, and a striped phase is seen to rapidly form in a uniaxial field, with a shear slip zone in each sheet. However, as the influence of Brownian motion increases, the fluid stress decreases, especially at lower Mason numbers, and the striped phase eventually disappears, even when the fluid stress is still high. In a biaxial field, an opposite trend is seen. where Brownian motion decreases the stress most significantly at higher Mason numbers. To account for the uniaxial steady shear data we propose a microscopic chain model of the role played by thermal fluctuations on the theology of ER and MR fluids that delineates the regimes where an applied field can impact the fluid viscosity, and gives an analytical prediction for the thermal effect. In oscillatory shear, a striped phase again appears in a uniaxial field, at strain amplitudes greater than similar to0.15, and the presence of a shear slip zone creates strong stress nonlinearities at low strain amplitudes. In a biaxial field, a shear slip zone is not created, and so the stress nonlinearities develop only at expected strain amplitudes. The nonlinear dynamics of these systems is shown to be in good agreement with the Kinetic Chain Model. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM jmartin@sandia.gov NR 19 TC 5 Z9 5 U1 1 U2 3 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9792 EI 1793-6578 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD MAR 20 PY 2001 VL 15 IS 6-7 SI SI BP 574 EP 595 DI 10.1142/S0217979201005039 PG 22 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA 434TQ UT WOS:000168832300005 ER PT J AU Gulley, GL Tao, R AF Gulley, GL Tao, R TI Structures of a magnetorheological fluid SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT 7th International Conference on Electro-Rhelological Fluids and Magneto-Rheological Suspension CY JUL 09-23, 1999 CL HONOLULU, HAWAII ID FIELD AB Molecular dynamics simulations were carried out to find the underlying structures of a Magnetorheological (MR) fluid while taking into account dipolar forces, viscous drag, and the Brownian force. Three different structures were found: the bet lattice, chains, and a liquid state. The conditions under which these structures are found is based on two parameters A and B which are the ratios of the dipolar force to the viscous drag force and the Brownian force to the dipolar force respectively. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA. RP Gulley, GL (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. OI Tao, Rongjia/0000-0001-5058-4401 NR 8 TC 23 Z9 24 U1 0 U2 9 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 912805, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD MAR 20 PY 2001 VL 15 IS 6-7 SI SI BP 851 EP 858 DI 10.1142/S0217979201005362 PG 8 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA 434TQ UT WOS:000168832300038 ER PT J AU Yang, KL Ying, TY Yiacoumi, S Tsouris, C Vittoratos, ES AF Yang, KL Ying, TY Yiacoumi, S Tsouris, C Vittoratos, ES TI Electrosorption of ions from aqueous solutions by carbon aerogel: An electrical double-layer model SO LANGMUIR LA English DT Article ID DIMENSIONAL CHANGES; CAPACITIVE DEIONIZATION; GRAPHITE-ELECTRODES; ANION ADSORPTION; MOLECULAR-MODEL; INTERFACE; REMOVAL; MERCURY; CHARGE; CO2 AB An electrical double-layer model is developed to predict electrosorption of ions from aqueous solutions by carbon aerogel electrodes. The carbon aerogel electrodes are treated as electrical double-layer capacitors, and electrosorption is modeled using classical electrical double-layer theory. Because of the porous characteristics of the electrodes, the total capacity of the system is obtained by summing the contributions of the individual pores. The pore size distribution of the carbon aerogel is measured by the physical adsorption of N-2 and CO2 as well as by mercury intrusion porosimetry. When a pore has a width smaller than a specific value (cutoff pore width),it does not contribute to the total capacity because of the electrical double-layer overlapping effect. This effect greatly reduces the electrosorption capacity for electrodes with significant numbers of micropores, such as carbon aerogel; thus, it is considered in the electrical double-layer model. The model in this study focuses on the electrosorption of sodium fluoride, which exhibits minimal specific adsorption. Several equilibrium electrosorption experiments are performed under Various conditions of ion solution concentration and applied voltage. When the overlapping effect is considered, modeling results agree well with experimental data obtained at voltages up to 1.2 V. Without the double-layer overlapping correction, the model greatly overestimates,the electrosorption capacity. The cutoff pore width is found to decrease with increasing ion solution concentration and applied voltage. An approximate modeling approach is also presented in this work,which is more efficient than the exact solution in terms of numerical computations. C1 Georgia Inst Technol, Atlanta, GA 30332 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Chevron Res & Technol Co, Richmond, CA 94802 USA. RP Yiacoumi, S (reprint author), Georgia Inst Technol, 200 Bobby Dodd Way, Atlanta, GA 30332 USA. RI Yang, Kun-Lin/C-2247-2011; Tsouris, Costas/C-2544-2016 OI Yang, Kun-Lin/0000-0002-7958-9334; Tsouris, Costas/0000-0002-0522-1027 NR 47 TC 169 Z9 182 U1 17 U2 116 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAR 20 PY 2001 VL 17 IS 6 BP 1961 EP 1969 DI 10.1021/la001527s PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 412JX UT WOS:000167552200026 ER PT J AU Baski, AA Erwin, SC Turner, MS Jones, KM Dickinson, JW Carlisle, JA AF Baski, AA Erwin, SC Turner, MS Jones, KM Dickinson, JW Carlisle, JA TI Morphology and electronic structure of the Ca/Si(111) system SO SURFACE SCIENCE LA English DT Article DE alkaline earth metals; silicon; reflection high-energy electron diffraction (RHEED); scanning tunneling microscopy; synchrotron radiation photoelectron spectroscopy; density functional calculations; electron density, excitation spectra calculations; surface relaxation and reconstruction ID SCANNING-TUNNELING-MICROSCOPY; SI(111) SURFACE; DENSITY; RECONSTRUCTIONS; TRANSITION; ADSORPTION; METALS; SINGLE; PHASE; SI AB The Ca/Si(111) system has been studied using reflection high-energy electron diffraction,, scanning tunneling microscopy (STM), synchrotron radiation photoemission, and first-principles total-energy calculations, This system forms a series of odd-order n x 1 (n = 3, 5, 7,...) reconstructions that culminate with a 2 x 1 phase at 0.5 ML. Our results indicate that the honeycomb-chain-channel (HCC) model accounts well for the observed data from the 3 x 1 surface. We propose a model for the 2 x 1 phase based upon pi -bonded Seiwatz Si chains, and explain the intermediate odd-order phases as appropriate combinations of the 2 x 1 Seiwatz chains and 3 x 1 HCC chains. Calculated surface energies based on this model correctly predict that for increasing Ca coverage, the 3 x 1, 5 x 1, and 2 x 1 phases will each appear as stable phases. Simulated STM images are in excellent agreement with experiment. The Ca 3 x 1 phase exhibits a suppression of emission at the Fermi level and a local 2a (a = 0.38 nm) corrugation along the rows in STM images, both of which are consistent with the formation of either a charge-density wave or a one-dimensional correlated insulator. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Virginia Commonwealth Univ, Dept Phys, Richmond, VA 23284 USA. USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Baski, AA (reprint author), Virginia Commonwealth Univ, Dept Phys, 1020 W Main St, Richmond, VA 23284 USA. RI Erwin, Steven/B-1850-2009; OI Baski, Alison/0000-0002-8985-8067 NR 24 TC 58 Z9 58 U1 1 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 MAR 20 PY 2001 VL 476 IS 1-2 BP 22 EP 34 DI 10.1016/S0039-6028(00)01112-2 PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 412WH UT WOS:000167577000004 ER PT J AU Schumann, FO Tobin, JG AF Schumann, FO Tobin, JG TI Observation of component fine structure in the linear dichroism of Fe 3p photoelectron emission SO SURFACE SCIENCE LA English DT Letter DE magnetic measurements; angle resolved photoemission; synchrotron radiation photoelectron spectroscopy; epitaxy; magnetic phenomena (cyclotron resonance; phase transitions etc.); surface structure, morphology, roughness, and topography ID CALCULATED MAGNETIC-PROPERTIES; CORE-LEVEL PHOTOEMISSION; ALLOY-FILMS; CIRCULAR-DICHROISM; POLARIZED-LIGHT; SPECTROSCOPY; MOMENTS; DIFFRACTION; FE(100); CU(001) AB We have investigated fee FexCo1-x/Cu(1 0 0) alloy films with linear magnetic dichroism in photoemission. Specifically we studied the emission from the Fe 3p core level. For the first time, we have observed fine structure for linear dichroism in the photoelectron emission of the Fe 3p core level and confirmed our assignments using spin-polarized photoelectron spectroscopy. This conclusively demonstrates the validity of the single electron, density of states model for the 3p manifold of 3d magnetic materials. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Lawrence Livermore Natl Lab, Dept Chem & Mat Sci, Livermore, CA 94550 USA. RP Tobin, JG (reprint author), Univ Calif Lawrence Livermore Natl Lab, Dept Chem & Mat Sci, L-357,POB 808,7000 East Ave, Livermore, CA 94550 USA. RI Schumann, Frank /K-9364-2014; Tobin, James/O-6953-2015 NR 23 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 20 PY 2001 VL 476 IS 1-2 BP L235 EP L240 DI 10.1016/S0039-6028(01)00693-8 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 412WH UT WOS:000167577000001 ER PT J AU Vijayalakshmi, S Zhang, Y Grebel, H Yaglioglu, G Dorsinville, R White, CW AF Vijayalakshmi, S Zhang, Y Grebel, H Yaglioglu, G Dorsinville, R White, CW TI Nonlinear dispersion properties of subwavelength photonic crystals SO APPLIED PHYSICS LETTERS LA English DT Article ID OPTICAL-PROPERTIES; ARRAY AB Nonlinear pulse compression and pulse broadening have been analyzed and demonstrated with a coherent array of submicron silica spheres embedded with silicon and germanium nanoparticles (nano within a nano). (C) 2001 American Institute of Physics. C1 New Jersey Inst Technol, Nonlinear Nanostruct Lab, Newark, NJ 07102 USA. CUNY City Coll, Dept Elect Engn, New York, NY 10031 USA. CUNY, Grad Ctr, New York, NY 10031 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Grebel, H (reprint author), New Jersey Inst Technol, Nonlinear Nanostruct Lab, Newark, NJ 07102 USA. NR 7 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 19 PY 2001 VL 78 IS 12 BP 1754 EP 1756 DI 10.1063/1.1357208 PG 3 WC Physics, Applied SC Physics GA 410JF UT WOS:000167436300036 ER PT J AU Bardakci, K Konechny, A AF Bardakci, K Konechny, A TI Tachyon instability and Kondo type models SO NUCLEAR PHYSICS B LA English DT Article ID CONFORMAL-FIELD-THEORY; STRING THEORY; D-BRANES; ALGEBRA AB We consider compactifications of bosonic open string theory on maximal tori of various simple Lie algebras with a specific background coupled to the string boundaries. The resulting worldsheet CFT is a free theory perturbed by a boundary term that is marginal but not truly marginal. We assume that the theory flows to a nontrivial infrared fixed point that is similar to the one in Kondo model. This RG flow reflects the tachyon instability of the bosonic string vacuum. At the fixed paint we calculate the new spectrum and some of the Green's functions. We find that in some of the sectors the tachyon mass gets lifted that can be interpreted as a result of switching on appropriate Wilson lines. Various compactifications and patterns of flows are investigated. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. Inst Adv Study, Princeton, NJ 08540 USA. RP Bardakci, K (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM kbardakci@lbl.gov; konechy@thsrv.lbl.gov NR 33 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR 19 PY 2001 VL 598 IS 1-2 BP 427 EP 447 DI 10.1016/S0550-3213(00)00782-3 PG 21 WC Physics, Particles & Fields SC Physics GA 415YY UT WOS:000167752200020 ER PT J AU Schmidt, JAR Chmura, SA Arnold, J AF Schmidt, JAR Chmura, SA Arnold, J TI Alkyl and alkylidene tantalum-lithium complexes supported by an anionic triazacyclononane ligand SO ORGANOMETALLICS LA English DT Article ID RAY CRYSTAL-STRUCTURE; IMIDO COMPLEXES; METAL-COMPLEXES; NIOBIUM; DERIVATIVES; ELIMINATION; DIALKYL; AMIDO AB A new Pr-i(2)-tacn(-)-supported alkyl tantalum species, (Me3SiCH2)(2)(RN=)Ta(mu -CH2SiMe3)(mu -n(1):n(3)-(i)-Pr-2-tacn)Li (R = 2,6-(Pr2C6H3)-Pr-i; 2), was synthesized and found to undergo alpha -H abstraction under gentle heating to form the alkylidene (Me3SiCH2)(RN=)Ta(mu -CHSiMe3)(mu -n(1):n(3)-Pr-i(2)-tacn)Li (3), The syntheses and crystal structures of 2 and 3 and their precursor ((Pr-i(2)-tacn)TaCl2(=NR) (1)) are described, as well as kinetic data for the first-order thermolysis reaction producing 3. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Arnold, J (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Arnold, John/F-3963-2012 OI Arnold, John/0000-0001-9671-227X NR 23 TC 15 Z9 15 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR 19 PY 2001 VL 20 IS 6 BP 1062 EP 1064 DI 10.1021/om0010621 PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 413TX UT WOS:000167628900011 ER PT J AU Reynolds, MA Guzei, IA Angelici, RJ AF Reynolds, MA Guzei, IA Angelici, RJ TI Re-2(CO)(10)-mediated carbon-hydrogen and carbon-sulfur bond cleavage of dibenzothiophene and 2,5-dimethylthiophene SO ORGANOMETALLICS LA English DT Article ID C-S BOND; TRANSITION-METAL COMPLEXES; HOMOGENEOUS HYDRODESULFURIZATION; CRYSTAL-STRUCTURE; BENZOTHIOPHENE; THIOPHENE; MANGANESE; INSERTION; MODEL; DESULFURIZATION AB Ultraviolet photolysis of Re-2(CO)lo and excess dibenzothiophene (DBT) in the noncoordinating solvent hexanes produces the S-bound eq-Re-2(CO)(9)(eta (1)(S)-DBT) (1) and the novel. C-H-cleaved DBT complex Re-2(CO)(8)(mu -C12H7S)(mu -H) (2) Under similar conditions, Re-2(CO)lo reacts with excess 2,5-dimethylthiophene (2,5-Me2T) to give the interesting C-S-cleaved 2,5-Me2T complex Re-2(CO)(7)(mu -2,5-Me2T) (3). The photolysis reactions of Re-2(CO)(10) with DBT and 2,5Me(2)T were inhibited by CO (1 atm)and also by the radical scavenger TEMPO, which suggests that both CO dissociation and homolytic Re-Re bond cleavage are involved. The eta (1)(S)-bound thiophene complexes 1 and Re-2(CO)(9)(eta (1)(S)-2,5-Me2T) (5) were prepared from Re2(CO)S(THF) (4). The DBT ligand in 1 is labile and rapidly (<2 min) reacts with CO (1 atm) to form Re-2(CO)(10) in 1,2-DCE. On the basis of its X-ray structure, complex 1 has one of the smallest tilt angles ( = 113 degrees) observed for a metal-thiophene complex, which may be understood in terms of pi -back-bonding arguments. Complexes 1-3 were characterized by spectroscopic (IR, NMR) methods and by their structures that were determined by X-ray crystallography. Mechanisms for the formation of 1-3 are presented and discussed. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Angelici, RJ (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. NR 64 TC 38 Z9 38 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR 19 PY 2001 VL 20 IS 6 BP 1071 EP 1078 DI 10.1021/om000708m PG 8 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 413TX UT WOS:000167628900013 ER PT J AU Zhong, JX Diener, RB Steck, DA Oskay, WH Raizen, MG Plummer, EW Zhang, ZY Niu, Q AF Zhong, JX Diener, RB Steck, DA Oskay, WH Raizen, MG Plummer, EW Zhang, ZY Niu, Q TI Shape of the quantum diffusion front SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIFRACTAL WAVE-FUNCTIONS; QUASIPERIODIC SYSTEMS; ANOMALOUS DIFFUSION; RENORMALIZATION-GROUP; CANTOR SPECTRA; LOCALIZATION; DYNAMICS; MODEL; FIBONACCI; LATTICES AB We show that quantum diffusion has well-defined front shape. After an initial transient, the wave packet front (tails) is described by a stretched exponential P(chi, t) = A(t) exp(- \ chi /w \ (gamma)), with 1 < gamma < oa, where w(t) is the spreading width which scales as w(t) similar to t(beta), with 0 < beta less than or equal to 1. The two exponents satisfy the universal relation gamma = 1/(1 - beta). We demonstrate these results through numerical work on one-dimensional quasiperiodic systems and the three-dimensional Anderson model of disorder. We provide an analytical derivation of these relations by using the memory function formalism of quantum dynamics. Furthermore, we present an application to experimental results for the quantum kicked rotor. C1 Univ Texas, Dept Phys, Austin, TX 78712 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Xiangtan Univ, Dept Phys, Hunan 411105, Peoples R China. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. RP Zhong, JX (reprint author), Univ Texas, Dept Phys, Austin, TX 78712 USA. RI Niu, Qian/G-9908-2013 NR 38 TC 23 Z9 24 U1 2 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 MAR 19 PY 2001 VL 86 IS 12 BP 2485 EP 2489 DI 10.1103/PhysRevLett.86.2485 PG 5 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800001 PM 11289963 ER PT J AU Aubert, B Boutigny, D De Bonis, I Gaillard, JM Jeremie, K Karyotakis, Y Lees, JP Robbe, P Tisserand, V Palano, A Chen, GP Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Reinertsen, PL Stugu, B Abbott, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Clark, AR Dardin, S Day, C Dow, SF Elioff, T Fan, Q Gaponenko, I Gill, MS Goozen, FR Gowdy, SJ Gritsan, A Groysman, Y Jacobsen, RG Jared, RC Kadel, RW Kadyk, J Karcher, A Kerth, LT Kipnis, I Kluth, S Kolomensky, YG Kral, JE Lafever, R LeClerc, C Levi, ME Lewis, SA Lionberger, C Liu, T Long, M Lynch, G Marino, M Marks, K Meyer, AB Mokhtarani, A Momayezi, M Nyman, M Oddone, PJ Ohnemus, J Oshatz, D Patton, S Perazzo, A Peters, C Pope, W Pripstein, M Quarrie, DR Rasson, JE Roe, NA Romosan, A Ronan, MT Shelkov, VG Stone, R Telnov, AV von der Lippe, H Weber, T Wenzel, WA Zisman, MS Bright-Thomas, PG Harrison, TJ Hawkes, CM Kirk, A Knowles, DJ O'Neale, SW Watson, AT Watson, NK Deppermann, T Koch, H Krug, J Kunze, M Lewandowski, B Peters, K Schmuecker, H Steinke, M Andress, JC Barlow, NR Bhimji, W Chevalier, N Clark, PJ Cottingham, WN De Groot, N Dyce, N Foster, B Mass, A McFall, JD Wallom, D Wilson, FF Abe, K Hearty, C Mattison, TS McKenna, JA Thiessen, D Camanzi, B Jolly, S McKemey, AK Tinslay, J Blinov, VE Bukin, AD Bukin, DA Buzykaev, AR Dubrovin, MS Golubev, VB Ivanchenko, VN Kolachev, GM Korol, AA Kravchenko, EA Onuchin, AP Salnikov, AA Serednyakov, SI Skovpen, YI Telnov, VI Yushkov, AN Lankford, AJ Mandelkern, M McMahon, S Stoker, DP Ahsan, A Buchanan, C Chun, S MacFarlane, DB Prell, S Rahatlou, S Raven, G Sharma, V Burke, S Campagnari, C Dahmes, B Hale, D Hart, PA Kuznetsova, N Kyre, S Levy, SL Long, O Lu, A Richman, JD Verkerke, W Witherell, M Yellins, S Beringer, J Dorfan, DE Eisner, AM Frey, A Grillo, AA Grothe, M Heusch, CA Johnson, RP Kroeger, W Lockman, WS Puiliam, T Sadrozinski, H Schalk, T Schmitz, RE Schumm, BA Seiden, A Spencer, EN Turri, M Walkowiak, W Williams, DC Chen, E Dubois-Felsmann, GP Dvoretskii, A Hanson, JE Hitlin, DG Metzler, S Oyang, J Porter, FC Ryd, A Samuel, A Weaver, M Yang, S Zhu, RY Devmal, S Geld, TL Jayatilleke, S Jayatilleke, SM Mancinelli, G Meadows, BT Sokoloff, MD Bloom, P Fahey, S Ford, WT Gaede, F van Hoek, WC Johnson, DR Michael, AK Nauenberg, U Olivas, A Park, H Rankin, P Roy, J Sen, S Smith, JG Wagner, DL Blouw, J Harton, JL Krishnamurthy, M Soffer, A Toki, WH Warner, DW Wilson, RJ Zhang, J Brandt, T Brose, J Colberg, T Dahlinger, G Dickopp, M Dubitzky, RS Eckstein, P Futterschneider, H Krause, R Maly, E Muller-Pfefferkorn, R Otto, S Schubert, KR Schwierz, R Spaan, B Wilden, L Behr, L Bernard, D Bonneaud, GR Brochard, F Cohen-Tanugi, J Ferrag, S Fouque, G Gastaldi, F Matricon, P de Freitas, PM Renard, C Roussot, E Jampens, ST Thiebaux, C Vasileiadis, G Verderi, M Anjomshoaa, A Bernet, R Di Lodovico, F Khan, A Muheim, F Playfer, S Swain, JE Falbo, M Bozzi, C Dittongo, S Folegani, M Piemontese, L Treadwell, E Anulli, F Baldini-Ferroli, R Calcaterra, A de Sangro, R Falciai, D Finocchiaro, G Patteri, P Peruzzi, IM Piccolo, M Xie, Y Zallo, A Bagnasco, S Buzzo, A Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Pallavicini, M Passaggio, S Pastore, FC Patrignani, C Pia, MG Robutti, E Santroni, A Morii, M Bartoldus, R Dignan, T Hamilton, R Mallik, U Cochran, J Crawley, HB Fischer, PA Lamsa, J McKay, R Meyer, WT Rosenberg, EI Albert, JN Beigbeder, C Benkebil, M Breton, D Cizeron, R Du, S Grosdidier, G Hast, C Hocker, A LePeltier, V Lutz, AM Plaszczynski, S Schune, MH Trincaz-Duvoid, S Truong, K Valassi, A Wormser, G Bionta, RM Brigijevic, V Brooks, A Fackler, O Fujino, D Lange, DJ Mugge, M O'Connor, TG Pedrotti, B Shi, X van Bibber, K Wenaus, TJ Wright, DM Wuest, CR Yamamoto, B Carroll, M Fry, JR Gabathuler, E Gamet, R George, M Kay, M Payne, DJ Sloane, RJ Touramanis, C Aspinwall, ML Bowerman, DA Dauncey, PD Egede, U Eschrich, I Gunawardane, NJW Martin, R Nash, JA Price, DR Sanders, P Smith, D Azzopardi, DE Back, JJ Dixon, P Harrison, PF Newman-Coburn, D Potter, RJL Shorthouse, HW Strother, P Vidal, PB Williams, MI Cowan, G George, S Green, MG Kurup, A Marker, CE McGrath, P McMahon, TR Salvatore, F Scott, I Vaitsas, G Brown, D Davis, CL Ford, K Li, Y Pavlovich, J Allison, J Barlow, RJ Boyd, JT Fullwood, J Jackson, F Laffery, GD Savvas, N Simopoulos, ET Thompson, RJ Weatherall, JH Bard, R Farbin, A Jawahery, A Lillard, V Olsen, J Roberts, DA Schieck, JR Blaylock, G Dallapiccola, C Flood, KT Hertzbach, SS Kofler, R Lin, CS Staengle, H Willocq, S Wittlin, J Brau, B Cowan, R Sciolla, G Taylor, F Yamamoto, RK Britton, DI Milek, M Patel, PM Trischuk, J Lanni, F Palombo, F Bauer, JM Booke, M Cremaldi, L Eschenberg, V Kroeger, R Reep, M Reidy, J Sanders, DA Summers, DJ Beaulieu, M Martin, JP Nief, JY Seitz, R Taras, P Zacek, V Nicholson, H Sutton, CS Cavallo, N Cartaro, C De Nardo, G Fabozzi, F Gatto, C Lista, L Paolucci, P Piccolo, D Sciacca, C LoSecco, JM Alsmiller, JRG Gabriel, TA Handler, T Heck, J Brau, JE Frey, P Iwasaki, M Sinev, NB Strom, D Borsato, E Colecchia, F Dal Corso, F Galeazzi, F Maroni, M Marzolla, M Michelon, G Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Torassa, E Voci, C Bailly, P Benayoun, M Briand, H Chauveau, J David, P De la Vaissiere, C Del Buono, L Genat, JF Hamon, O Le Diberder, F Lebbolo, H Leruste, P Lory, J Martin, L Roos, L Stark, J Versille, S Zhang, B Manfredi, PF Ratti, L Re, V Speziali, V Frank, ED Gladney, L Guo, QH Panetta, JH Angelini, C Batignani, G Bettarini, S Bondioli, M Bosi, F Carpinelli, M Forti, F Giorgi, MA Lusiani, A Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Simi, G Triggiani, G Walsh, J Haire, M Judd, D Paick, K Turnbull, L Wagoner, DE Albert, J Bula, C Fernholz, R Lu, C McDonald, KT Miftakov, V Sands, B Schaffner, SF Smith, AJS Tumanov, A Varnes, EW Bronzini, F Buccheri, A Bulfon, C Cavoto, G del Re, D Faccini, R Ferrarotto, F Ferroni, F Fratini, K Lamanna, E Leonardi, E Mazzoni, MA Morganti, S Piredda, G Tehrani, ES Serra, M Voena, C Waldi, R Jacques, PE Kalelkar, M Plano, RJ Adye, T Claxton, B Franek, B Galagedera, S Geddes, NI Gopa, GP Lidbury, J Xella, SM Aleksan, R Besson, P Bourgeois, P De Domenico, G Emery, S Gaidot, A Ganzhur, SF Gosset, L de Monchenault, GH Kozanecki, W Langer, M London, GW Mayer, B Serfass, B Vasseur, G Yeche, C Zito, M Copty, N Purohit, MV Singh, H Yumiceva, FX Adam, I Anthony, PL Aston, D Baird, K Bartelt, J Becla, J Bell, R Bloom, E Boeheim, CT Boyarski, AM Boyce, RF Bulos, F Burgess, W Byers, B Calderini, G Claus, R Convery, MR Coombes, R Cottrell, L Coupal, DP Coward, DH Craddock, WW DeSstaebler, H Dorfan, J Doser, M Dunwoodie, W Ecklund, S Fieguth, TH Field, RC Freytag, DR Glanzman, T Godfrey, GL Grosso, P Haller, G Hanushevsky, A Harris, J Hasan, A 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DeSstaebler, H Dorfan, J Doser, M Dunwoodie, W Ecklund, S Fieguth, TH Field, RC Freytag, DR Glanzman, T Godfrey, GL Grosso, P Haller, G Hanushevsky, A Harris, J Hasan, A Hewett, JL Himel, T Huffer, ME Innes, WR Jessop, CP Kawahara, H Keller, L Kelsey, MH Kim, P Klaisner, LA Kocian, ML Krebs, HJ Kunz, PF Langenegger, U Langeveld, W Leith, DWGS Louie, SK Luitz, S Luth, V Lynch, HL MacDonald, J Manzin, G Marsiske, H McCulloch, M McShurley, D Menke, S Messner, R Metcalfe, S Moffeit, KC Mount, R Muller, DR Nelson, D Nordby, M O'Grady, CP O'Neill, FG Oxoby, G Pavel, T Perl, J Petrak, S Putallaz, G Quinn, H Raines, PE Ratcliff, BN Reif, R Robertson, SH Rochester, LS Roodman, A Russell, JJ Sapozhnikov, L Saxton, OH Schietinger, T Schindler, RH Schwiening, J Seeman, JT Serbo, VV Skarpass, K Snyder, A Soha, A Spanier, SM Stah, A Stelzer, J Su, D Sullivan, MK Talby, M Tanaka, HA Va'vra, J Wagner, SR Weinstein, AJR White, JL Wienands, U Wisniewski, WJ Young, CC Zioulas, G Burchat, PR Cheng, CH Kirkby, D Meyer, TI Roat, C De Silva, A Henderson, R Berridge, S Bugg, W Cohn, H Hart, E Weidemann, AW Benninger, T Izen, JM Kitayama, I Lou, XC Turcotte, M Bianchi, F Bona, M Di Girolamo, B Gamba, D Smol, A Zanin, D Bosisio, L Della Ricca, G Lanceri, L Pompili, A Poropat, P Vuagnin, G Panvini, RS Brown, CM Kowalewski, R Roney, JM Band, HR Charles, E Dasu, S Elmer, P Hu, H Johnson, JR Nielsen, J Orejudos, W Pan, Y Prepost, R Scott, IJ von Wimmersperg-Toeller, JH Wu, SL Yu, Z Zobernig, H Kordich, TMB Moore, TB Neal, H CA BABAR Collaboration TI Measurement of CP-violating asymmetries in B-0 decays to CP eigenstates SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23 X 10(6) Y (4S) --> B (B) over bar decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAG. Zn this sample, we find events in which one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result is sin2 beta = 0.34 +/- 0.20 (stat) +/- 0.05 (syst). C1 Phys Particules Lab, 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, Berkeley, CA 94720 USA. 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 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, F-91128 Palaiseau, France. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. Elon Univ, Elon, NC 27244 USA. Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy. Univ Ferrara, 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. Univ Genoa, Ist Nazl Fis Nucl, I-16146 Genoa, Italy. Harvard Univ, Cambridge, MA 02138 USA. 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 Imperial Coll Sci Technol & Med, London SW7 2BW, England. 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. 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Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Univ Roma La Sapienza, Ist Nazl Fis Nucl, I-00185 Rome, Italy. Univ Rostock, D-18051 Rostock, Germany. Rutgers State Univ, New Brunswick, NJ 08903 USA. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CEA, 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. TRIUMF, Vancouver, BC V6T 2A3, Canada. Univ Tennessee, Knoxville, TN 37996 USA. Univ Texas, Richardson, TX 75083 USA. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy. Univ Turin, Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy. Univ Trieste, 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. RP Anulli, F (reprint author), Phys Particules Lab, F-74941 Annecy Le Vieux, France. RI Rotondo, Marcello/I-6043-2012; Peters, Klaus/C-2728-2008; de Groot, Nicolo/A-2675-2009; Lista, Luca/C-5719-2008; Levy, Stephen/C-3493-2011; Schaffner, Stephen/D-1189-2011; Stahl, Achim/E-8846-2011; Frank, Edward/A-8865-2012; Roe, Natalie/A-8798-2012; Pia, Maria Grazia/C-7034-2012; Britton, David/F-2602-2010; Torassa, Ezio/I-1788-2012; Forti, Francesco/H-3035-2011; Rizzo, Giuliana/A-8516-2015; Lusiani, Alberto/N-2976-2015; Lusiani, Alberto/A-3329-2016; Morandin, Mauro/A-3308-2016; Della Ricca, Giuseppe/B-6826-2013; Di Lodovico, Francesca/L-9109-2016; Calcaterra, Alessandro/P-5260-2015; Korol, Aleksandr/A-6244-2014; Ratti, Lodovico/I-8836-2012; de Sangro, Riccardo/J-2901-2012; Valassi, Andrea/K-7506-2012; Telnov, Valery/C-6900-2009; Cavallo, Nicola/F-8913-2012; Patrignani, Claudia/C-5223-2009; Monge, Maria Roberta/G-9127-2012; Kravchenko, Evgeniy/F-5457-2015; Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere, Maurizio/J-5049-2012; Pallavicini, Marco/G-5500-2012 OI Re, Valerio/0000-0003-0697-3420; Wallom, David/0000-0001-7527-3407; Rotondo, Marcello/0000-0001-5704-6163; Peters, Klaus/0000-0001-7133-0662; Stahl, Achim/0000-0002-8369-7506; Pia, Maria Grazia/0000-0002-3579-9639; Britton, David/0000-0001-9998-4342; Forti, Francesco/0000-0001-6535-7965; Galeazzi, Fulvio/0000-0002-6830-9982; Watson, Nigel/0000-0002-8142-4678; Sciacca, Crisostomo/0000-0002-8412-4072; Nielsen, Jason/0000-0002-9175-4419; Adye, Tim/0000-0003-0627-5059; Rizzo, Giuliana/0000-0003-1788-2866; Faccini, Riccardo/0000-0003-2613-5141; Cavoto, Gianluca/0000-0003-2161-918X; Wilson, Robert/0000-0002-8184-4103; Torassa, Ezio/0000-0003-2321-0599; Lusiani, Alberto/0000-0002-6876-3288; Lusiani, Alberto/0000-0002-6876-3288; Morandin, Mauro/0000-0003-4708-4240; Della Ricca, Giuseppe/0000-0003-2831-6982; Di Lodovico, Francesca/0000-0003-3952-2175; Calcaterra, Alessandro/0000-0003-2670-4826; RATTI, LODOVICO/0000-0003-1906-1076; Sloane, Richard/0000-0001-5584-2844; Paoloni, Eugenio/0000-0001-5969-8712; Korol, Aleksandr/0000-0001-8448-218X; de Sangro, Riccardo/0000-0002-3808-5455; Valassi, Andrea/0000-0001-9322-9565; Telnov, Valery/0000-0002-8312-8119; Patrignani, Claudia/0000-0002-5882-1747; Monge, Maria Roberta/0000-0003-1633-3195; Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky, Yury/0000-0001-8496-9975; Lo Vetere, Maurizio/0000-0002-6520-4480; Pallavicini, Marco/0000-0001-7309-3023 NR 13 TC 115 Z9 115 U1 2 U2 13 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 MAR 19 PY 2001 VL 86 IS 12 BP 2515 EP 2522 DI 10.1103/PhysRevLett.86.2515 PG 8 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800008 PM 11289970 ER PT J AU Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Balm, PW Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Bean, A Begel, M Belyaev, A Beri, SB Bernardi, G Bertram, I Besson, A Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Buehler, M Buescher, V Burtovoi, VS Butler, JM Canelli, F Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Cho, DK Choi, S Chopra, S Christenson, JH Chung, M Claes, D Clark, AR Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cummings, MAC Cutts, D Dahl, OI Davis, GA Davis, K De, K Del Signore, K Demarteau, M Demina, R Demine, P Denisov, D Denisov, SP Desai, S Diehl, HT Diesburg, M Di Loreto, G Doulas, S Draper, P Ducros, Y Dudko, LV Duensing, S Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Graham, G Grannis, PD Green, JA Greenlee, H Grinstein, S Groer, L Grudberg, P Grunendahl, S Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Heidn, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hou, S Huang, Y Ito, AS Jerger, SA Jesik, R Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Juste, A Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Kuznetsov, VE Landsberg, G Leflat, A Lehner, F Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lucotte, A Lueking, L Lundstedt, C Maciel, AKA Madaras, RJ Manankov, V Mao, HS Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McMahon, T Melanson, HL Meng, XC Merkin, M Merritt, KW Miao, C Miettinen, H Mihalcea, D Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Moore, RW Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, B Oshima, N Padley, P Pan, LJ Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Peters, O Piegaia, R Piekarz, H Pope, BG Popkov, E Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramberg, E Rapidis, PA Reay, NW Reucroft, S Rha, J Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Schwartzman, A Sculli, J Sen, N Shabalina, E Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Simak, V Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sorin, V Sosebee, M Sotnikova, N Soustruznik, K Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Taylor, W Tentindo-Repond, S Thompson, J Toback, D Tripathi, SM Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Van Kooten, R Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Wang, H Wang, ZM Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Whiteson, D Wightman, JA Wijngaarden, DJ Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Z Zanabria, M Zheng, H Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Balm, PW Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Bean, A Begel, M Belyaev, A Beri, SB Bernardi, G Bertram, I Besson, A Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Buehler, M Buescher, V Burtovoi, VS Butler, JM Canelli, F Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Cho, DK Choi, S Chopra, S Christenson, JH Chung, M Claes, D Clark, AR Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cummings, MAC Cutts, D Dahl, OI Davis, GA Davis, K De, K Del Signore, K Demarteau, M Demina, R Demine, P Denisov, D Denisov, SP Desai, S Diehl, HT Diesburg, M Di Loreto, G Doulas, S Draper, P Ducros, Y Dudko, LV Duensing, S Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Graham, G Grannis, PD Green, JA Greenlee, H Grinstein, S Groer, L Grudberg, P Grunendahl, S Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Heidn, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hou, S Huang, Y Ito, AS Jerger, SA Jesik, R Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Juste, A Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Kuznetsov, VE Landsberg, G Leflat, A Lehner, F Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lucotte, A Lueking, L Lundstedt, C Maciel, AKA Madaras, RJ Manankov, V Mao, HS Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McMahon, T Melanson, HL Meng, XC Merkin, M Merritt, KW Miao, C Miettinen, H Mihalcea, D Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Moore, RW Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, B Oshima, N Padley, P Pan, LJ Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Peters, O Piegaia, R Piekarz, H Pope, BG Popkov, E Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramberg, E Rapidis, PA Reay, NW Reucroft, S Rha, J Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Schwartzman, A Sculli, J Sen, N Shabalina, E Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Simak, V Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sorin, V Sosebee, M Sotnikova, N Soustruznik, K Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Taylor, W Tentindo-Repond, S Thompson, J Toback, D Tripathi, SM Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Van Kooten, R Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Wang, H Wang, ZM Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Whiteson, D Wightman, JA Wijngaarden, DJ Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Z Zanabria, M Zheng, H Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A CA D0 Collaborat TI Ratio of jet cross sections at root s=630 GeV and 1800 GeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTON DISTRIBUTIONS; (P)OVER-BAR-P COLLISIONS; GLOBAL ANALYSIS AB The DO Collaboration has measured the inclusive jet cross section in (p) over barp collisions at roots = 630 GeV. The results for pseudorapidities \ eta \ < 0.5 are combined with our previous results at roots = 1800 GeV to form a ratio of cross sections with smaller uncertainties than either individual measurement. Next-to-leading-order QCD predictions show excellent agreement with the measurement at 630 GeV; agreement is also satisfactory for the ratio. Specifically, despite a 10% to 15% difference in the absolute magnitude, the dependence of the ratio on jet transverse momentum is very similar for data and theory. C1 Univ Buenos Aires, Buenos Aires, DF, Argentina. Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil. Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Los Andes, Bogota, Colombia. Charles Univ, Prague, Czech Republic. Acad Sci, Inst Phys, Prague, Czech Republic. Univ San Francisco, Quito, Ecuador. Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, Grenoble, France. Univ Mediterranee, CNRS, IN2P3, CPPM, Marseille, France. Univ Paris 06, CNRS, LPNHE, IN2P3, Paris, France. Univ Paris 07, CNRS, LPNHE, IN2P3, Paris, France. CEA, DAPNIA, Serv Phys Particules, Saclay, France. Panjab Univ, Chandigarh 160014, India. Univ Delhi, Delhi 110007, India. Tata Inst Fundamental Res, Mumbai, India. Seoul Natl Univ, Seoul, South Korea. CINVESTAV, Mexico City 14000, DF, Mexico. FOM, Inst NIKHEF, NL-1098 SJ Amsterdam, Netherlands. Univ Amsterdam, NIKHEF, Amsterdam, Netherlands. Univ Nijmegen, NIKHEF, Nijmegen, Netherlands. Inst Nucl Phys, Krakow, Poland. Inst Theoret & Expt Phys, Moscow, Russia. Moscow State Univ, Moscow, Russia. Inst High Energy Phys, Protvino, Russia. Univ Lancaster, Lancaster, England. Univ Arizona, Tucson, AZ 85721 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Davis, Davis, CA 95616 USA. Calif State Univ Fresno, Fresno, CA 93740 USA. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Illinois, Chicago, IL 60607 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Indiana Univ, Bloomington, IN 47405 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Iowa State Univ, Ames, IA 50011 USA. Univ Kansas, Lawrence, KS 66045 USA. Kansas State Univ, Manhattan, KS 66506 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ Maryland, College Pk, MD 20742 USA. Boston Univ, Boston, MA 02215 USA. Northeastern Univ, Boston, MA 02115 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ Nebraska, Lincoln, NE 68588 USA. Columbia Univ, New York, NY 10027 USA. NYU, New York, NY 10003 USA. Univ Rochester, Rochester, NY 14627 USA. SUNY Stony Brook, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Langston Univ, Langston, OK 73050 USA. Univ Oklahoma, Norman, OK 73019 USA. Brown Univ, Providence, RI 02912 USA. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. Rice Univ, Houston, TX 77005 USA. Univ Washington, Seattle, WA 98195 USA. RP Abbott, B (reprint author), Univ Buenos Aires, Buenos Aires, DF, Argentina. RI Sznajder, Andre/L-1621-2016; Canelli, Florencia/O-9693-2016; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Yip, Kin/D-6860-2013; Kuleshov, Sergey/D-9940-2013; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Belyaev, Alexander/F-6637-2015; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015 OI Sznajder, Andre/0000-0001-6998-1108; Canelli, Florencia/0000-0001-6361-2117; Baarmand, Marc/0000-0002-9792-8619; Bean, Alice/0000-0001-5967-8674; Dudko, Lev/0000-0002-4462-3192; Yip, Kin/0000-0002-8576-4311; Kuleshov, Sergey/0000-0002-3065-326X; De, Kaushik/0000-0002-5647-4489; Belyaev, Alexander/0000-0002-1733-4408; Kim, Sun Kee/0000-0002-0013-0775; NR 14 TC 14 Z9 14 U1 0 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 MAR 19 PY 2001 VL 86 IS 12 BP 2523 EP 2528 DI 10.1103/PhysRevLett.86.2523 PG 6 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800009 PM 11289971 ER PT J AU Brown, CN Awes, TC Beddo, ME Brooks, ML Bush, JD Carey, TA Chang, TH Cooper, WE Gagliardi, CA Garvey, GT Geesaman, DF Hawker, EA He, XC Isenhower, LD Kaplan, DM Kaufman, SB Kirk, PN Koetke, DD Kyle, G Lee, DM Lee, WM Leitch, MJ Makins, N McGaughey, PL Moss, JM Mueller, BA Nord, PM Papavassiliou, V Park, BK Peng, JC Petitt, G Reimer, PE Sadler, ME Sondheim, WE Stankus, PW Thompson, TN Towell, RS Tribble, RE Vasiliev, MA Webb, JC Willis, JL Wise, DK Young, GR AF Brown, CN Awes, TC Beddo, ME Brooks, ML Bush, JD Carey, TA Chang, TH Cooper, WE Gagliardi, CA Garvey, GT Geesaman, DF Hawker, EA He, XC Isenhower, LD Kaplan, DM Kaufman, SB Kirk, PN Koetke, DD Kyle, G Lee, DM Lee, WM Leitch, MJ Makins, N McGaughey, PL Moss, JM Mueller, BA Nord, PM Papavassiliou, V Park, BK Peng, JC Petitt, G Reimer, PE Sadler, ME Sondheim, WE Stankus, PW Thompson, TN Towell, RS Tribble, RE Vasiliev, MA Webb, JC Willis, JL Wise, DK Young, GR CA FNAL E866 NuSea Collaborat TI Observation of polarization in bottomonium production at root s=38.8 GeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID OCTET QUARKONIA PRODUCTION; DIMUON PRODUCTION; HADRON COLLISIONS; CROSS-SECTIONS; HIGH ENERGIES; ROOT-S; J/PSI; HADROPRODUCTION; DEPENDENCE; FERMILAB AB We present a measurement of the polarization observed for bottomonium states produced in p-Cu collisions at roots = 38.8 GeV. The angular distribution of the decay dimuons of the Y (1S) state shows no polarization at small values of the fractional longitudinal momentum chi (F) add transverse momentum p(T) but significant positive transverse production polarization for either p(T) > 1.8 GeV/c or for chi (F) > 0.35. The Y (2S + 3S) (unresolved) states show a large transverse production polarization at all values of chi (F) and pr measured. These observations challenge NRQCD calculations of the polarization expected in the hadronic production of bottomonium states. C1 Abilene Christian Univ, Abilene, TX 79699 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Georgia State Univ, Atlanta, GA 30303 USA. IIT, Chicago, IL 60616 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Louisiana State Univ, Baton Rouge, LA 70803 USA. New Mexico State Univ, Las Cruces, NM 88003 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Texas A&M Univ, College Stn, TX 77843 USA. Valparaiso Univ, Valparaiso, IN 46383 USA. RP Brown, CN (reprint author), Abilene Christian Univ, Abilene, TX 79699 USA. RI Reimer, Paul/E-2223-2013 NR 29 TC 32 Z9 32 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 19 PY 2001 VL 86 IS 12 BP 2529 EP 2532 DI 10.1103/PhysRevLett.86.2529 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800010 PM 11289972 ER PT J AU Chung, P Ajitanand, NN Alexander, JM Anderson, M Best, D Brady, FP Case, T Caskey, W Cebra, D Chance, JL Cole, B Crowe, K Das, A Draper, JE Gilkes, ML Gushue, S Heffner, M Hirsch, AS Hjort, EL Huo, L Justice, M Kaplan, M Keane, D Kintner, JC Klay, J Krofcheck, D Lacey, RA Lauret, J Lisa, MA Liu, H Liu, YM McGrath, R Milosevich, Z Odyniec, G Olson, DL Panitkin, SY Pinkenburg, C Porile, NT Rai, G Ritter, HG Romero, JL Scharenberg, R Schroeder, L Srivastava, B Stone, NTB Symons, TJM Wienold, T Witt, R Whitfield, J Wood, L Zhang, WN AF Chung, P Ajitanand, NN Alexander, JM Anderson, M Best, D Brady, FP Case, T Caskey, W Cebra, D Chance, JL Cole, B Crowe, K Das, A Draper, JE Gilkes, ML Gushue, S Heffner, M Hirsch, AS Hjort, EL Huo, L Justice, M Kaplan, M Keane, D Kintner, JC Klay, J Krofcheck, D Lacey, RA Lauret, J Lisa, MA Liu, H Liu, YM McGrath, R Milosevich, Z Odyniec, G Olson, DL Panitkin, SY Pinkenburg, C Porile, NT Rai, G Ritter, HG Romero, JL Scharenberg, R Schroeder, L Srivastava, B Stone, NTB Symons, TJM Wienold, T Witt, R Whitfield, J Wood, L Zhang, WN CA E895 Collaborat TI Directed flow of Lambda hyperons in (2-6)A GeV Au+Au collisions SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; RELATIVISTIC NUCLEAR COLLISIONS; PLUS AU COLLISIONS; KAON PRODUCTION; COLLECTIVE MOTION; NEUTRON-STARS; DENSE MATTER; ENERGIES AB Directed flow measurements for Lambda hyperons are presented and compared to those for protons produced in the same Au + Au collisions (2A, 4A, and 6A GeV; b < 5 - 6 fm). The measurements indicate that Lambda hyperons flow consistently in the same direction but with smaller magnitudes. A strong positive flow [for ns] has been predicted in calculations which include the influence of the Lambda -nucleon potential. The experimental flow ratio hip is in qualitative agreement with expectations (similar to2/3) from the quark counting rule at 2A GeV but is found to decrease with increasing beam energy. C1 SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA. Ohio State Univ, Columbus, OH 43210 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Kent State Univ, Kent, OH 44242 USA. Univ Calif Davis, Davis, CA 95616 USA. Purdue Univ, W Lafayette, IN 47907 USA. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Auckland, Auckland 1, New Zealand. Columbia Univ, New York, NY 10027 USA. St Marys Coll, Moraga, CA 94575 USA. Harbin Inst Technol, Harbin 150001, Peoples R China. RP Chung, P (reprint author), SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. RI Witt, Richard/H-3560-2012 NR 33 TC 22 Z9 22 U1 0 U2 2 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 MAR 19 PY 2001 VL 86 IS 12 BP 2533 EP 2536 DI 10.1103/PhysRevLett.86.2533 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800011 PM 11289973 ER PT J AU Gyulassy, M Vitev, I Wang, XN AF Gyulassy, M Vitev, I Wang, XN TI High p(T) azimuthal asymmetry in noncentral A+A at RHIC SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY-LOSS; COLLISIONS; MATTER; QUARKS; QCD AB The high p(T) > 3 GeV azimuthal asymmetry, nu (2)(p(T)), in noncentral nuclear collisions at RHIC is shown to be a sensitive measure of the initial parton density distribution of the produced quark-gluon plasma. A generalization of the Gyulassy-Levai-Vitev non-Abelian energy loss formalism including Bjorken (1 + 1)D expansion as well as important kinematic constraints is used. C1 Columbia Univ, Dept Phys, New York, NY 10027 USA. Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Gyulassy, M (reprint author), Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 19 TC 288 Z9 289 U1 0 U2 2 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 MAR 19 PY 2001 VL 86 IS 12 BP 2537 EP 2540 DI 10.1103/PhysRevLett.86.2537 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800012 PM 11289974 ER PT J AU Glenzer, SH Divol, LM Berger, RL Geddes, C Kirkwood, RK Moody, JD Williams, EA Young, PE AF Glenzer, SH Divol, LM Berger, RL Geddes, C Kirkwood, RK Moody, JD Williams, EA Young, PE TI Thomson scattering measurements of saturated ion waves in laser fusion plasmas SO PHYSICAL REVIEW LETTERS LA English DT Article ID STIMULATED BRILLOUIN-SCATTERING; DEFINED INTERACTION CONDITIONS; FLUCTUATIONS; BEHAVIOR; PARTICLE; DRIVEN; GROWTH; RAMAN; BEAMS AB We have measured the characteristics of saturated ion-acoustic waves in inertial confinement fusion plasmas. A 263-nm probe laser has been applied to simultaneous Thomson scatter on both ion-acoustic waves excited by thermal electrostatic fluctuations and by stimulated Brillouin scattering of a kilojoule laser beam of varying intensity. The Thomson scattering spectra show saturated ion-wave amplitudes for intensities above 5 x 10(14) W cm(-2) consistent with three dimensional nonlinear wave modeling. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. CEA, DIF, DCSA, SET, F-91680 Bruyeres Le Chatel, France. RP Lawrence Livermore Natl Lab, L-447,POB 808, Livermore, CA 94551 USA. NR 28 TC 36 Z9 36 U1 0 U2 1 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 MAR 19 PY 2001 VL 86 IS 12 BP 2565 EP 2568 DI 10.1103/PhysRevLett.86.2565 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800019 PM 11289981 ER PT J AU Kim, K Zunger, A AF Kim, K Zunger, A TI Spatial correlations in GaInAsN alloys and their effects on band-gap enhancement and electron localization SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEMICONDUCTORS; (ZN,MG)(S,SE); GAINNAS AB In contrast to pseudobinary alloys, the relative number of bonds in quaternary alloys cannot be determined uniquely from the composition. Indeed, we do not know if the Ga0.5In0.5As0.5N0.5 alloy should be thought of as InAs + GaN or as InN + GaAs. We study the distribution of bonds using Monte Carlo simulation and find that the number of In-N and Ga-As bonds increases relative to random alloys. This quaternary-unique short range order affects the band structure: we calculate a blueshift of the band gap and predict the emergence of a broadband tail of localized states around the conduction band minimum. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Kim, K (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 21 TC 226 Z9 229 U1 0 U2 13 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 MAR 19 PY 2001 VL 86 IS 12 BP 2609 EP 2612 DI 10.1103/PhysRevLett.86.2609 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800030 PM 11289992 ER PT J AU Kent, PRC Zunger, A AF Kent, PRC Zunger, A TI Evolution of III-V nitride alloy electronic structure: The localized to delocalized transition SO PHYSICAL REVIEW LETTERS LA English DT Article ID BAND-STRUCTURE; BOUND EXCITONS; GAASN ALLOYS; GAAS1-XNX; NITROGEN; GAP; DEPENDENCE; GANXAS1-X; PRESSURE; STATES AB Addition of nitrogen to III-V semiconductor alloys radically changes their electronic properties. We report large-scale electronic structure calculations of GaAsN and GaPN using an approach that allows arbitrary states to emerge, couple, and evolve with composition. We find a novel mechanism of alloy formation where localized cluster states within the gap are gradually overtaken by a downwards moving conduction band edge, composed of both localized and delocalized states. This localized to delocalized transition explains many of the hitherto puzzling experimentally observed anomalies in III-V nitride alloys. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Kent, PRC (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Kent, Paul/A-6756-2008; Zunger, Alex/A-6733-2013 OI Kent, Paul/0000-0001-5539-4017; NR 27 TC 220 Z9 224 U1 2 U2 29 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 MAR 19 PY 2001 VL 86 IS 12 BP 2613 EP 2616 DI 10.1103/PhysRevLett.86.2613 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800031 PM 11289993 ER PT J AU Hilgenfeldt, S Kraynik, AM Koehler, SA Stone, HA AF Hilgenfeldt, S Kraynik, AM Koehler, SA Stone, HA TI An accurate von Neumann's law for three-dimensional foams SO PHYSICAL REVIEW LETTERS LA English DT Article ID GROWTH LAWS; DRAINAGE EQUATION; GRAIN-GROWTH; KINETICS AB The diffusive coarsening of 2D soap froths is governed by von Neumann's law. A statistical version of this law for dry 3D foams has long been conjectured. A new derivation, based on a theorem by Minkowski, yields an explicit analytical von Neumann's law in 3D which is in very good agreement with detailed simulations and experiments. The average growth rate of a bubble with F faces is shown to be proportional to F-1/2 for large F, in contrast to the conjectured linear dependence. Accounting-for foam disorder in the model further improves the agreement with data. C1 Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Sandia Natl Labs, Engn Sci Ctr, Albuquerque, NM 87185 USA. RP Hilgenfeldt, S (reprint author), Univ Twente, POB 217, NL-7500 AE Enschede, Netherlands. RI Stone, Howard/B-6435-2008; Hilgenfeldt, Sascha/B-7356-2009; Hilgenfeldt, Sascha/A-4593-2014 OI Hilgenfeldt, Sascha/0000-0002-6799-2118 NR 29 TC 101 Z9 102 U1 2 U2 20 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 MAR 19 PY 2001 VL 86 IS 12 BP 2685 EP 2688 DI 10.1103/PhysRevLett.86.2685 PG 4 WC Physics, Multidisciplinary SC Physics GA 412UY UT WOS:000167573800049 PM 11290011 ER PT J AU Subramania, G Constant, K Biswas, R Sigalas, MM Ho, KM AF Subramania, G Constant, K Biswas, R Sigalas, MM Ho, KM TI Inverse face-centered cubic thin film photonic crystals SO ADVANCED MATERIALS LA English DT Article ID BAND-GAP CRYSTALS; COLLOIDAL SYSTEMS; CRYSTALLIZATION; WAVELENGTHS AB Recent work on a technique for fabricating inverse fcc photonic crystals from a colloidal system of monodisperse microspheres ann titania nanoparticles is described. The technique can be used to produce photonic crystals with other background materials that are available as nanoparticles. The Figure shows the Moire pattern of a typical photonic crystal sample. C1 Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Microelect Res Ctr, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, US DOE, Dept Mat Sci & Engn, Ames, IA 50011 USA. RP Ho, KM (reprint author), Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA. RI Constant, Kristen/C-3673-2014 OI Constant, Kristen/0000-0001-7138-9365 NR 30 TC 47 Z9 47 U1 1 U2 7 PU WILEY-V C H VERLAG GMBH PI BERLIN PA PO BOX 10 11 61, D-69451 BERLIN, GERMANY SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD MAR 16 PY 2001 VL 13 IS 6 BP 443 EP 446 DI 10.1002/1521-4095(200103)13:6<443::AID-ADMA443>3.0.CO;2-K 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 419XF UT WOS:000167973500014 ER PT J AU Cherrak, DE Guiochon, G AF Cherrak, DE Guiochon, G TI Phenomenological study of the bed-wall friction in axially compressed packed chromatographic columns SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE axial compression; wall effects; shear stress; stationary phases, LC; column packing ID PACKING MATERIALS; PREPARATIVE CHROMATOGRAPHY; LIQUID-CHROMATOGRAPHY; RADIAL-DISTRIBUTION; FLOW VELOCITY; CONSOLIDATION; EFFICIENCY; BEHAVIOR AB The properties of column beds prepared with slurries of Kromasil C-8 in 12 different solvents, using the same axial compression skid, were investigated. The extent of the consolidation of the column beds, their permeabilities, and the friction shear stress of these beds against the column wall were determined, as well as the column efficiencies (for an unretained tracer). The results of this study illustrate the influence of the wall effect on the consolidation. The permeability of columns consolidated under a constant compression stress was found to increase with increasing bed length. The bed-wall friction shear stress increases rapidly with increasing bed length and varies widely with the nature of the solvent used. No correlation was found between this shear stress and any physico-chemical property of the solvent. The best efficiency was observed for a column consolidated from a slurry in ethanol. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, 552 Buchler Hall, Knoxville, TN 37996 USA. NR 39 TC 9 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAR 16 PY 2001 VL 911 IS 2 BP 147 EP 166 DI 10.1016/S0021-9673(01)00518-0 PG 20 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 405YX UT WOS:000167189100002 PM 11293577 ER PT J AU Schmidt, TJ Grgur, BN Markovic, NM Rose, PN AF Schmidt, TJ Grgur, BN Markovic, NM Rose, PN TI Oscillatory behavior in the electrochemical oxidation of formic acid on Pt(100): rotation and temperature effects SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE oscillatory electrochemical reaction; formic acid; Pt(100) electrode ID SINGLE-CRYSTAL SURFACES; SULFURIC-ACID; POTENTIOSTATIC CONTROL; PLATINUM-ELECTRODES; INSTABILITIES; PT(111); FORMALDEHYDE; MECHANISM; REDUCTION; INTERFACE AB We investigated the oscillatory behavior in the kinetics of formic acid electrooxidation on Pt(100) in 1 mM HClO4 solution. We studied the effect of different experimental parameters on the oscillatory behavior, viz. defined HCOOH mass-transport to the electrode surface by using the rotating disk electrode technique, the temperature of the supporting electrolyte, and the nature of anions. We suggest that the interdependence of the reaction steps during HCOOH oxidation, the adsorption of anions and the competition for adsorption sites among the reaction partners and intermediates lead to complex non-linear kinetics. It was evident that once the individual reactions in the dual path mechanism reach steady state the oscillations vanish. These conditions can be reached either by enhanced formic acid reaction rates induced by electrode rotation or by increased temperature. Under specific conditions of anion and formic acid concentration, relaxational oscillations can be transformed into mixed-mode oscillations. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Schmidt, TJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RI Schmidt, Thomas/A-2586-2010; OI Schmidt, Thomas/0000-0002-1636-367X; Grgur, Branimir/0000-0003-4684-9053 NR 29 TC 39 Z9 41 U1 1 U2 14 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 16 PY 2001 VL 500 IS 1-2 SI SI BP 36 EP 43 DI 10.1016/S0022-0728(00)00342-9 PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 423RW UT WOS:000168192000006 ER PT J AU Stamenkovic, V Markovic, NM Ross, PN AF Stamenkovic, V Markovic, NM Ross, PN TI Structure-relationships in electrocatalysis: oxygen reduction and hydrogen oxidation reactions on Pt(111) and Pt(100) in solutions containing chloride ions SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE oxygen reduction; hydrogen oxidation; Pt(111); Pt(100); effect of chloride ions ID SINGLE-CRYSTAL SURFACES; ADSORPTION; INTERFACE; ELECTROSORPTION; RELAXATION; ELECTRODE; BROMIDE; ANIONS AB Kinetics of the oxygen reduction reaction (orr) and the hydrogen evolution-oxidation reactions (her/hor) were studied on the Pt(111) and Pt(100) surfaces in 0.05 M H2SO4 containing Cl-. The orr is strongly inhibited on the (100) surface modified by adsorbed Cl- (Cl-ad), and it occurs as a 3.5e(-) reduction via, solution phase peroxide formation. In the hydrogen adsorption (H-upd) potential region, the orr is even more inhibited, and corresponds only to a 2 e(-) reduction at the negative potential limit where the electrode is covered by one monolayer of H-upd and some (unknown) amount of Cl-ad. On the Pt(111)-Cl-ad surface, the orr is inhibited relatively little tin addition to that caused by strong bisulfate anion adsorption on this surface), and the reaction pathway is the same as in Cl- free solution. The kinetics of the hor on Pt(111) are the same in pure solution and in a solution containing Cl-, since Cl-ad does not affect platinum sites required for the breaking of the H-H bond. A relatively large inhibition of the hor is observed on the (100) surface, implying that strongly adsorbed Cl-ad is present on the surface even near 0 V. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Markovic, NM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 23 TC 153 Z9 156 U1 15 U2 123 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 16 PY 2001 VL 500 IS 1-2 SI SI BP 44 EP 51 DI 10.1016/S0022-0728(00)00352-1 PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 423RW UT WOS:000168192000007 ER PT J AU Marinkovic, NS Wang, JX Zajonz, H Adzic, RR AF Marinkovic, NS Wang, JX Zajonz, H Adzic, RR TI Adsorption of bisulfate on the Ru(0001) single crystal electrode surface SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE anion adsorption; ruthenium electrodes; Ru(0001) surface; ruthenium oxidation; in situ FT-IR spectroscopy ID IN-SITU; INFRARED-SPECTROSCOPY; PLATINUM-ELECTRODES; PT(111) ELECTRODE; POLYCRYSTALLINE PLATINUM; SULFATE ADSORPTION; AU(111) ELECTRODE; ADSORBED SULFATE; RUTHENIUM; OXYGEN AB Adsorption of anions from sulfuric acid solutions has been studied on Ru(0001) single crystal and polycrystalline surfaces by electrochemical techniques and in-situ Fourier transform infrared spectroscopy. Infrared spectroscopy shows that bisulfate is the anion adsorbed on the Ru(0001) surface. The bisulfate adsorption is detected at the H-2 evolution potential and extends into the potential region where the Ru surface is oxidized. A method for extracting unipolar bands from bipolar bands has been presented. The tuning rate of adsorbed bisulfate in the double layer potential region of Ru(0001) was found to be significantly smaller than those observed for other platinum metals. This has been ascribed to a small change in bisulfate coverage on Ru(0001) in this potential range. Bisulfate vibration frequencies are higher on this surface than at any face-centered cubic metal with the (111) orientation. Oxidation of the Ru(0001) surface is limited to one electron per Ru atom, distinctly different from the high degree of oxidation seen in polycrystalline surfaces. For oxidized polycrystalline Ru, only solution phase sulfates and bisulfates are observed in the IR spectra. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Energy Sci & Technol Dept, Div Mat & Chem Sci, Upton, NY 11973 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Adzic, RR (reprint author), Brookhaven Natl Lab, Energy Sci & Technol Dept, Div Mat & Chem Sci, Upton, NY 11973 USA. RI Wang, Jia/B-6346-2011; Marinkovic, Nebojsa/A-1137-2016 OI Marinkovic, Nebojsa/0000-0003-3579-3453 NR 38 TC 44 Z9 44 U1 2 U2 16 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 16 PY 2001 VL 500 IS 1-2 SI SI BP 388 EP 394 DI 10.1016/S0022-0728(00)00456-3 PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 423RW UT WOS:000168192000043 ER PT J AU Wandlowski, T Wang, JX Ocko, BM AF Wandlowski, T Wang, JX Ocko, BM TI Adsorption of bromide at the Ag(100) electrode surface SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE bromide adsorption; Ag(100) electrodes; chronocoulometry ID SINGLE-CRYSTAL ELECTRODES; ELECTRICAL DOUBLE LAYER; X-RAY-SCATTERING; AU(111) ELECTRODE; 2ND-HARMONIC GENERATION; HALIDE ADSORPTION; IONIC ADSORPTION; SOLID-SURFACES; LATTICE-GAS; UNDERPOTENTIAL DEPOSITION AB The adsorption and phase formation of bromide on Ag(100) has been studied by chronocoulometry and surface X-ray scattering (SXS). With increasing electrode potential, bromide undergoes a phase transition from a lattice gas to an ordered c(2 x 2) structure (theta = 0.5). The degree of lateral disorder was estimated by comparing the SXS- and the electrochemical measurements. Based on chronocoulometric experiments, a thermodynamic analysis of charge density data was performed to describe the bromide adsorption at the Ag(100) electrode. The Gibbs surfaces excess, electrosorption valencies, Esin-Markov coefficients, and the Gibbs energy of adsorption, lateral interaction energies as well as surface dipole moments have been estimated. The experimental theta versus E- isotherms are modeled employing (i) a quasi-chemical approximation as well as (ii) the results of a recent Monte Carlo simulation. An attempt is made to discuss the structure data and thermodynamic quantities of bromide adsorption on Ag(100) on the basis of the Grahame-Parsons model of the Helmholtz layer. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Forschungszentrum Julich, Inst Grenzflachenforsch & Vakuumphys, D-52425 Julich, Germany. Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11790 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11790 USA. RP Wandlowski, T (reprint author), Forschungszentrum Julich, Inst Grenzflachenforsch & Vakuumphys, Postfach 1913, D-52425 Julich, Germany. EM th.wandlowski@fz-juelich.de RI Thomas, Wandlowski/C-7251-2009; Wang, Jia/B-6346-2011 NR 81 TC 39 Z9 39 U1 1 U2 11 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 1572-6657 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 16 PY 2001 VL 500 IS 1-2 BP 418 EP 434 DI 10.1016/S0022-0728(00)00380-6 PG 17 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 423RW UT WOS:000168192000046 ER PT J AU Kardash, D Korzeniewski, C Markovic, N AF Kardash, D Korzeniewski, C Markovic, N TI Effects of thermal activation on the oxidation pathways of methanol at bulk Pt-Ru alloy electrodes SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE thermal activation; oxidation pathways; methanol; Pt-Ru electrodes ID ROTATING-DISK ELECTRODE; FORMIC-ACID ADSORBATES; IN-SITU FTIR; ELECTROCHEMICAL OXIDATION; CO ELECTROOXIDATION; ELECTROCATALYTIC OXIDATION; FORMALDEHYDE YIELDS; PLATINUM-ELECTRODE; PT(111) ELECTRODE; SURFACE-STRUCTURE AB The competition between pathways that lead to adsorbed CO and CO, during the electrochemical oxidation of 1.0 M methanol in 0.1 M HClO4 on two bulk Pt-Ru alloys (10 at.% Ru (X-Ru approximate to 0.1) and 90 at.% Ru (X-Ru approximate to 0.9)) was investigated for temperatures in the range of 25-80 degreesC. On the high Ru content alloy studied (X-Ru approximate to 0.9), the dissociative chemisorption of methanol was inhibited below 70 degreesC; the faradaic current for methanol oxidation was low, and only small quantities of adsorbed CO and CO, were detected with infrared spectroscopy between 0.2-0.8 V (vs. RHE). At 80 degreesC, strong infrared bands from CO2 and adsorbed, atop coordinated CO were observed over the potential ranges of 0.4-0.8 V and 0.2-0.8 V, respectively. The infrared measurements are consistent with the observation that bulk, high Ru content alloy electrodes appear passivated toward methanol oxidation below 70 degreesC. On the low Ru content ahoy studied (X-Ru approximate to 0.1), the methanol surface chemistry was similar to that of pure, polycrystalline Pt, but the electrode was more poison resistant than Pt. For both alloys, the persistence of strong adsorbed CO bands and rapid CO2 production between 0.4-0.8 V suggests CO functions as a reactive species with high steady-state coverages at these potentials. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Korzeniewski, C (reprint author), Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA. NR 44 TC 78 Z9 78 U1 1 U2 14 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 16 PY 2001 VL 500 IS 1-2 SI SI BP 518 EP 523 DI 10.1016/S0022-0728(00)00303-X PG 6 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 423RW UT WOS:000168192000056 ER PT J AU Puntes, VF Krishnan, KM Alivisatos, AP AF Puntes, VF Krishnan, KM Alivisatos, AP TI Colloidal nanocrystal shape and size control: The case of cobalt SO SCIENCE LA English DT Article ID MAGNETIC-PROPERTIES; SUPERLATTICES; NANOSTRUCTURES; PARTICLES AB We show that a relatively simple approach for controlling the colloidal synthesis of anisotropic cadmium selenide semiconductor nanorods can be extended to the size-controlled preparation of magnetic cobalt nanorods as well as spherically shaped nanocrystals. This approach helps define a minimum feature set needed to separately control the sizes and shapes of nanocrystals. The resulting cobalt nanocrystals produce interesting two- and three-dimensional superstructures, including ribbons of nanorods. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Puntes, VF (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Puntes, Victor/F-8407-2013; Alivisatos , Paul /N-8863-2015 OI Puntes, Victor/0000-0001-8996-9499; Alivisatos , Paul /0000-0001-6895-9048 FU NCRR NIH HHS [1 R01 RR-14891-01] NR 23 TC 1918 Z9 1968 U1 42 U2 615 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 16 PY 2001 VL 291 IS 5511 BP 2115 EP 2117 DI 10.1126/science.1057553 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 412PP UT WOS:000167563800029 PM 11251109 ER PT J AU Kang, SH Shortreed, MR Yeung, ES AF Kang, SH Shortreed, MR Yeung, ES TI Real-time dynamics of single-DNA molecules undergoing adsorption and desorption at liquid-solid interfaces SO ANALYTICAL CHEMISTRY LA English DT Article ID FLUORESCENCE MICROSCOPY; INDIVIDUAL MOLECULES; SURFACE-DIFFUSION; LATERAL DIFFUSION; AQUEOUS-SOLUTION; SUPERCOILED DNA; GOLD SURFACES; ELECTROPHORESIS; OLIGONUCLEOTIDES; VISUALIZATION AB The conformational dynamics and adsorption/desorption behavior of individual lambda -DNA molecules at liquid-solid interfaces were monitored by imaging within the evanescent field laver using total internal reflection fluorescence microscopy. At a fused-silica surface, molecular conformation and adsorption behavior were found to depend on both pH and buffer composition. A histogram of individual lambda -DNA adsorption durations measured by hydrodynamically flowing molecules along the interface exhibited asymmetry nearly identical to that of the corresponding elution peaks found in capillary liquid chromatography and capillary electrophoresis. The accessibility of the surface to the molecules, which is proportional to the capillary surface area-to-volume ratio, can be correlated with the capacity factor and the relative adsorption factor. At a Cls surface, the dynamics of individual DNA molecules changed with the addition of organic solvent as well as with pH. Hydrophobic interaction rather than electrostatic interaction was the major driving force for adsorption of individual DNA molecules. 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. NR 44 TC 110 Z9 111 U1 6 U2 31 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 15 PY 2001 VL 73 IS 6 BP 1091 EP 1099 DI 10.1021/ac0013599 PG 9 WC Chemistry, Analytical SC Chemistry GA 412GJ UT WOS:000167546400004 PM 11305636 ER PT J AU Cargile, BJ McLuckey, SA Stephenson, JL AF Cargile, BJ McLuckey, SA Stephenson, JL TI Identification of bacteriophage MS2 coat protein from E-coli lysates via ion trap collisional activation of intact protein ions SO ANALYTICAL CHEMISTRY LA English DT Article ID TANDEM MASS-SPECTROMETRY; ASSISTED-LASER-DESORPTION/IONIZATION; ELECTROSPRAY-IONIZATION; CAPILLARY-ELECTROPHORESIS; RAPID IDENTIFICATION; SEQUENCE DATABASES; LARGE MOLECULES; LOW-FEMTOMOLE; MICROORGANISMS; PEPTIDE AB Collisional activation of the intact MS2 viral capsid protein with subsequent ion/ion reactions has been used to identify the presence of this virus in E. coli lysates. Tandem ion trap mass spectrometry experiments on the +7, +8, and +9 charge states, followed by ion/ion reactions, provided the necessary sequence tag information (and molecular weight data) needed for protein identification via database searching. The most directly informative structural information is obtained from those charge states that produce a series of product ions arising from fragmentation at adjacent residues. The formation of these product ions via dissociation at adjacent amino acid residues depends greatly on the charge state of the parent ion. Database searching of the charge-state-specific sequence tags was performed by two different search engines: the ProteinInfo program from the Protein information Retrieval On-line World Wide Web Lab or PROWL and the TagIdent program from the ExPASy molecular biology server. These search engines were used in conjunction with the sequence tag information generated via collisional activation of the intact viral coat protein. These programs were used to evaluate the feasibility of generating sequence tags from collisional activation of intact multiply charged protein ions in a quadrupole ion trap. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA. Univ Illinois, Dept Biochem, Urbana, IL 61801 USA. RP Stephenson, JL (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Stephenson, James/A-9262-2009; McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 61 TC 77 Z9 77 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 15 PY 2001 VL 73 IS 6 BP 1277 EP 1285 DI 10.1021/ac0007251 PG 9 WC Chemistry, Analytical SC Chemistry GA 412GJ UT WOS:000167546400031 PM 11305663 ER PT J AU Pask, JE Klein, BM Sterne, PA Fong, CY AF Pask, JE Klein, BM Sterne, PA Fong, CY TI Finite-element methods in electronic-structure theory SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article DE ab initio electronic-structure calculations; density functional theory; finite-element methods; periodic boundary conditions ID DIFFERENCE-PSEUDOPOTENTIAL METHOD; DENSITY-FUNCTIONAL THEORY; POSITRON-ANNIHILATION; MOLECULAR-DYNAMICS; DIATOMIC-MOLECULES; FIRST-PRINCIPLES; WAVELET BASES; SOLIDS; SPECTROSCOPY; FORMALISM AB We discuss the application of the finite-element (FE) method to ab initio solid-state: electronic-structure calculations. In this method, the basis functions are strictly local, piecewise polynomials. Because the basis is composed of polynomials, the method is completely general and its convergence can be controlled systematically. Because the basis functions are strictly local in real space, the method allows for variable resolution in real space; produces sparse, structured matrices, enabling the effective use of iterative solution methods; and is well suited to parallel implementation. The method thus combines the significant advantages of both real-space-grid and basis-oriented approaches and so promises to be particularly well suited for large, accurate ab initio calculations. We discuss the construction and properties of the required FE bases and develop in detail their use in the solution of the Schrodinger and Poisson equations subject to boundary conditions appropriate for a periodic solid. We present results for the Schrodinger equation illustrating the rapid, variational convergence of the method in electronic band-structure calculations. We present results for the Poisson equation illustrating the rapid convergence of the method, both pointwise and in the L-2 norm, and its linear scaling with system size in the context of a model charge-density and Si pseudo-charge-density. Finally, we discuss the application of the method to large-scale ab initio positron distribution and lifetime calculations in solids and present results for a host of systems within the range of a conventional LMTO based approach for comparison, as well as results for systems well beyond the range of the conventional approach. The largest such calculation, involving a unit cell of 4092 atoms, was shown to be well within the range of the FE approach on existing computational platforms. (C) 2001 Elsevier Science B.V. All rights reserved. C1 USN, Res Lab, Washington, DC 20375 USA. Univ Calif Davis, Davis, CA 95616 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP USN, Res Lab, Washington, DC 20375 USA. EM pask@dave.nrl.navy.mil NR 75 TC 56 Z9 57 U1 3 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 EI 1879-2944 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD MAR 15 PY 2001 VL 135 IS 1 BP 1 EP 34 DI 10.1016/S0010-4655(00)00212-5 PG 34 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 415VN UT WOS:000167744400001 ER PT J AU Darlington, RM McAbee, TL Rodrigue, G AF Darlington, RM McAbee, TL Rodrigue, G TI A study of ALE simulations of Rayleigh-Taylor instability SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article DE arbitrary Lagrangian-Eulerian; Rayleigh-Taylor instability ID NUMERICAL-SIMULATION AB This paper investigates the use of an Arbitrary Langrangian-Eulerian (ALE) technique on a single-mode Rayleigh-Taylor instability simulation in two dimensions. A finite volume approach on a simply connected quadrilateral grid is used. The effect of various modifications in the ALE method on instability growth, energy balance, and mesh distortion are investigated. It is shown that ALE mesh motion can be used to improve single mode Rayleigh-Taylor Instability simulations. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Darlington, RM (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 24 TC 31 Z9 31 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD MAR 15 PY 2001 VL 135 IS 1 BP 58 EP 73 DI 10.1016/S0010-4655(00)00216-2 PG 16 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 415VN UT WOS:000167744400004 ER PT J AU Sanchez, R Hirshman, SP Wong, HV AF Sanchez, R Hirshman, SP Wong, HV TI Improved magnetic coordinate representation for ideal ballooning stability calculations with the COBRA code SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article DE stellarators; magnetohydrodynamics; ballooning instabilities; magnetic coordinates; Richardson's extrapolation; optimization ID MHD STABILITY; CONFIGURATIONS; STELLARATORS; PHYSICS; MODES AB The overall efficiency of the recently developed ideal ballooning code COBRA is greatly improved by using a magnetic equilibrium description based on the same magnetic coordinates used to compute it by the VMEC 3D equilibrium code. VMEC determines this set of coordinates by requiring a spectrally condensed Fourier representation of the solution, releasing in the process the constraint of straight-field-line coordinates. This increases the analytic complexity of the ideal ballooning stability problem, since another equation must be now solved to follow the magnetic field line when integrating the ideal ballooning equation. However, from a numerical point of view, the much smaller number of Fourier harmonics needed together with the elimination of an equilibrium mapping to straight-line coordinates saves an enormous amount of time. This enhancement might prove to be essential within the compact stellarator optimization environment in which the speed and accuracy of this code can play an important role. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Carlos III Madrid, Madrid 28911, Spain. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Texas, Inst Fus Studies, Austin, TX 78712 USA. RP Sanchez, R (reprint author), Univ Carlos III Madrid, Avda Univ 30, Madrid 28911, Spain. EM rsanchez@fis.uc3m.es RI Sanchez, Raul/C-2328-2008 NR 25 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 EI 1879-2944 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD MAR 15 PY 2001 VL 135 IS 1 BP 82 EP 92 DI 10.1016/S0010-4655(00)00225-3 PG 11 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 415VN UT WOS:000167744400006 ER PT J AU Jackson, AW Naone, RL Dalberth, MJ Smith, JM Malone, KJ Kisker, DW Klem, JF Choquette, KD Serkland, DK Geib, KM AF Jackson, AW Naone, RL Dalberth, MJ Smith, JM Malone, KJ Kisker, DW Klem, JF Choquette, KD Serkland, DK Geib, KM TI OC-48 capable InGaAsN vertical cavity lasers SO ELECTRONICS LETTERS LA English DT Article ID 1.3 MU-M; LOW-THRESHOLD; OPERATION AB A selectively oxidised InGaAsN/GaAs three quantum well vertical cavity laser (VCSEL) demonstrated continuous wave (CW) lasing with a singlemode output power of 0.749mW at 1266nm. This is the first reported InGaAsN VCSEL capable of meeting the power and wavelength requirements for both OC-48 SR and OC-48 IR-1 compliant links. The VCSEL uses two low absorption n-type GaAs/AlGaAs distributed Bragg reflectors and a tunnel junction to achieve current injection into the active region. A multimode version of the VCSEL had a output power of 1.43mW at 1.26 mum. CW lasing continued up to temperatures as high as 107 degreesC. The VCSEL material was grown by solid source molecular beam epitaxy with an RF nitrogen plasma source. C1 Cielo Commun Inc, Broomfield, CO 80021 USA. Sandia Natl Labs, Ctr Cpd Semicond Sci & Technol, Albuquerque, NM 87185 USA. RP Jackson, AW (reprint author), Cielo Commun Inc, 325 Interlocken Pkwy,Bldg A, Broomfield, CO 80021 USA. NR 9 TC 64 Z9 65 U1 0 U2 3 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 15 PY 2001 VL 37 IS 6 BP 355 EP 356 DI 10.1049/el:20010232 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA 418WH UT WOS:000167916800019 ER PT J AU Scheinost, AC Abend, S Pandya, KI Sparks, DL AF Scheinost, AC Abend, S Pandya, KI Sparks, DL TI Kinetic controls on Cu and Pb sorption by ferrihydrite SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID HYDROUS FERRIC-OXIDE; X-RAY-SCATTERING; ADSORPTION-DESORPTION; SURFACE-CHEMISTRY; STRUCTURAL MODEL; ALKALINE MEDIA; IRON-OXIDES; ARSENATE; EXAFS; SPECTROSCOPY AB Metal partitioning in ferrihydrite suspensions may reach equilibrium only after a long reaction time. To determine key factors controlling the kinetics, we measured Cu and Pb uptake as a function of ferrihydrite morphology, reaction temperature, metal competition, and fulvic acid concentration over a period of 2 months. X-ray microscopy, which was used to probe ferrihydrite morphology in suspension, showed that drying irreversibly converted the gellike structure of fresh precipitate into dense aggregates. These dense aggregates sorbed Cu and Pb much slower than the gel. Temperature had a more pronounced effect on the kinetics of metal uptake by ferrihydrite gel than by dense ferrihydrite. Independently of treatment and time, Cu and Ph were bound to the ferrihydrite surface by formation of edge-sharing inner-sphere sorption complexes as confirmed by X-ray absorption fine-structure (XAFS) spectroscopy. This invariable binding mechanism, together with the observed effects of morphology and temperature, are in line with surface diffusion limiting the slow sorption process. The quantification of diffusion-limited surface sites in soils and sediments and the subsequent estimation of the effect of reaction time and temperature will be a challenge for properly predicting the fate of metals in the environment. C1 Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19717 USA. SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Scheinost, AC (reprint author), Swiss Fed Inst Technol, Dept Environm Sci, Grabenstr 2, CH-8952 Schlieren, Switzerland. RI Scheinost, Andreas/D-2275-2010 NR 52 TC 124 Z9 129 U1 3 U2 68 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAR 15 PY 2001 VL 35 IS 6 BP 1090 EP 1096 DI 10.1021/es000107m PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 411ZN UT WOS:000167529700015 PM 11347919 ER PT J AU Bennett, DH Scheringer, M McKone, TE Hungerbuhler, K AF Bennett, DH Scheringer, M McKone, TE Hungerbuhler, K TI Predicting long range transport: A systematic evaluation of two multimedia transport models SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SEMIVOLATILE ORGANIC-CHEMICALS; AIR PARTITION-COEFFICIENT; GENERAL FORMULATION; SPATIAL RANGE; PERSISTENCE; ENVIRONMENT; DIBENZOFURANS; BEHAVIOR; DIOXINS; URBAN AB The United Nations Environment Program has recently developed criteria to identify and restrict chemicals with a potential for persistence and long-range transport (persistent organic pollutants or POPs). There are many stakeholders involved, and the issues are not only scientific but also include social, economic, and political factors. This work focuses on one aspect of the POPs debate, the criteria for determining the potential for long-range transport (LRT). Our goal is to determine if current models are reliable enough to support decisions that classify a chemical based on the LRT potential: We examine the robustness of two multimedia fate models for determining the,relative ranking and absolute spatial range of various chemicals in the environment. We also consider the effect of parameter uncertainties anti the model uncertainty associated with the selection of an algorithm for gas-particle partitioning on the model results. Given the same chemical properties, both models give virtually the same ranking. However, when chemical parameter uncertainties and model uncertainties Such as particle partitioning are considered, the spatial range distributions obtained for the individual chemicals overlap, preventing a distinct rank order. The absolute values obtained for the predicted spatial range or travel distance differ significantly between the two models for the uncertainties evaluated. We find that to evaluate a chemical when large and unresolved uncertainties exist, it is more informative to use two or more models and include multiple types of uncertainty. Model differences and uncertainties must be explicitly confronted to determine how the limitations of scientific knowledge impact predictions in the decision-making process. C1 ETH Zentrum, Chem Engn Lab, Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland. Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Sch Publ Hlth, Berkeley, CA 94720 USA. RP Scheringer, M (reprint author), ETH Zentrum, Chem Engn Lab, Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland. NR 31 TC 41 Z9 45 U1 0 U2 20 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAR 15 PY 2001 VL 35 IS 6 BP 1181 EP 1189 DI 10.1021/es001278u PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 411ZN UT WOS:000167529700027 PM 11347931 ER PT J AU Pollock, CJ Asamura, K Balkey, MM Burch, JL Funsten, HO Grande, M Gruntman, M Henderson, M Jahn, JM Lampton, M Liemohn, MW McComas, DJ Mukai, T Ritzau, S Schattenburg, ML Scime, E Skoug, R Valek, P Wuest, M AF Pollock, CJ Asamura, K Balkey, MM Burch, JL Funsten, HO Grande, M Gruntman, M Henderson, M Jahn, JM Lampton, M Liemohn, MW McComas, DJ Mukai, T Ritzau, S Schattenburg, ML Scime, E Skoug, R Valek, P Wuest, M TI First medium energy neutral atom (MENA) images of Earth's magnetosphere during substorm and storm-time SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID RING CURRENT; MISSION; PHASE AB Initial ENA images obtained with the MENA imager on the IMAGE observatory show that ENAs emanating from Earth's magnetosphere at least crudely track both Dst and Kp. Images obtained during the storm of August 12, 2000, clearly show strong ring current asymmetry during storm main phase and early recovery phase, and a high degree of symmetry during the late recovery phase. Thus, these images establish the existence of both partial and complete ring currents during the same storm. Further, they suggest that ring current loss through the day side magnetopause dominates other loss processes during storm main phase and early recovery phase. C1 SW Res Inst, San Antonio, TX 78238 USA. Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan. W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA. Univ Calif Los Alamos Natl Lab, CSSE, NIS 1, Los Alamos, NM 87545 USA. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ So Calif, Dept Aerosp Engn, Los Angeles, CA 90089 USA. Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Univ Michigan, SPRL, Ann Arbor, MI 48109 USA. MIT, Ctr Space Res, Cambridge, MA 02139 USA. Auburn Univ, Dept Phys, Auburn, AL 36849 USA. RP Pollock, CJ (reprint author), SW Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA. RI Liemohn, Michael/H-8703-2012; Funsten, Herbert/A-5702-2015; Gruntman, Mike/A-5426-2008; Grande, Manuel/C-2242-2013; Henderson, Michael/A-3948-2011; OI Liemohn, Michael/0000-0002-7039-2631; Funsten, Herbert/0000-0002-6817-1039; Gruntman, Mike/0000-0002-0830-010X; Grande, Manuel/0000-0002-2233-2618; Henderson, Michael/0000-0003-4975-9029; Valek, Philip/0000-0002-2318-8750 NR 20 TC 45 Z9 45 U1 1 U2 3 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 MAR 15 PY 2001 VL 28 IS 6 BP 1147 EP 1150 DI 10.1029/2000GL012641 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 411JD UT WOS:000167494200050 ER PT J AU Blakely, EA Chang, PY McNamara, MP Bjornstad, KA AF Blakely, EA Chang, PY McNamara, MP Bjornstad, KA TI p57(KIP2) and E2F1 expression in differentiating cultured human lens epithelial cells. SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSOC RESEARCH VISION OPHTHALMOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 2001 VL 42 IS 4 SU S MA 1668 BP S310 EP S310 PG 1 WC Ophthalmology SC Ophthalmology GA 427EP UT WOS:000168392101653 ER PT J AU Kenyon, GT Marshak, DW AF Kenyon, GT Marshak, DW TI Amacrine cells synchronize the firing of alpha ganglion cells over a wide range of stimulus intensities in a retinal model. SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. Univ Texas, Hlth Sci Ctr, Dept Neurobiol & Anat, Houston, TX USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASSOC RESEARCH VISION OPHTHALMOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 2001 VL 42 IS 4 SU S MA 3629 BP S674 EP S674 PG 1 WC Ophthalmology SC Ophthalmology GA 427EP UT WOS:000168392103592 ER PT J AU Ravi, N Thiyagarajan, P Hamilton, PD Seifert, S Littrell, K AF Ravi, N Thiyagarajan, P Hamilton, PD Seifert, S Littrell, K TI Characterization of porcine B lens crystallins using light scattering, viscosity and small angle X-ray scattering. SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 Washington Univ, St Louis, MO 63130 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, IPNS Div, Argonne, IL USA. VA Med Ctr, St Louis, MO USA. RI Littrell, Kenneth/D-2106-2013 OI Littrell, Kenneth/0000-0003-2308-8618 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSOC RESEARCH VISION OPHTHALMOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 2001 VL 42 IS 4 SU S MA 1592 BP S294 EP S294 PG 1 WC Ophthalmology SC Ophthalmology GA 427EP UT WOS:000168392101582 ER PT J AU Chapyak, EJ Kerrisk, JF Godwin, RP AF Chapyak, EJ Kerrisk, JF Godwin, RP TI Analytical model for the disruption of a metal jet penetrating detonating high explosive SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB We investigate the interaction of a constant-velocity, long-rod penetrator with detonating high explosive. An analytical flow-field model extending the Birkhoff model of inert target penetration is developed and compared with numerical simulations. We propose a rod-disruption model, discuss the effect of enhanced "anomalous" rod erosion on penetration history, and estimate the maximum coherent penetration depth. The model is extended to idealized stretching jet penetrators and its predictions are compared with jet-high-explosive (HE) interaction experiments. We predict a strong dependence of the high-explosive penetration on penetrator diameter and a very high "virtual" HE density in agreement with experimental observations. (C) 2001 American Institute of Physics. C1 Univ Calif Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA. RP Chapyak, EJ (reprint author), Univ Calif Los Alamos Natl Lab, Div Appl Phys, POB 1663, Los Alamos, NM 87545 USA. NR 16 TC 0 Z9 0 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2001 VL 89 IS 6 BP 3177 EP 3183 DI 10.1063/1.1345863 PG 7 WC Physics, Applied SC Physics GA 406ZZ UT WOS:000167248100017 ER PT J AU Jorgensen, JD Hu, Z Short, S Sleight, AW Evans, JSO AF Jorgensen, JD Hu, Z Short, S Sleight, AW Evans, JSO TI Pressure-induced cubic-to-orthorhombic phase transformation in the negative thermal expansion material HfW2O8 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ZRW2O8 AB The effect of pressure on the crystal structure of HfW2O8 has been investigated by neutron powder diffraction. At a hydrostatic pressure of 0.62 GPa at room temperature the cubic material transforms, with a 5% reduction in volume, to the same orthorhombic phase that is seen in the isostructural compound ZrW2O8 above 0.21 GPa. The transformation is sluggish, requiring about 24 h to complete at constant pressure. Once formed, the orthorhombic phase is retained upon release of pressure. Upon heating to 360 K, the metastable orthorhombic phase transforms back to the cubic phase. The substantially higher pressure for the cubic-to-orthorhombic transition in HfW2O8, compared to ZrW2O8, may be important for the application of this material in composites with controlled thermal expansion because rather large local pressures can occur in such composites. (C) 2001 American Institute of Physics. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA. Oregon State Univ, Ctr Adv Mat Res, Corvallis, OR 97331 USA. Univ Durham, Dept Chem, Univ Sci Labs, Durham DH1 3LE, England. RP Jorgensen, JD (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Evans, John/E-6345-2012 OI Evans, John/0000-0001-6305-6341 NR 12 TC 41 Z9 46 U1 0 U2 8 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2001 VL 89 IS 6 BP 3184 EP 3188 DI 10.1063/1.1347412 PG 5 WC Physics, Applied SC Physics GA 406ZZ UT WOS:000167248100018 ER PT J AU Myers, SM Wright, AF Petersen, GA Wampler, WR Seager, CH Crawford, MH Han, J AF Myers, SM Wright, AF Petersen, GA Wampler, WR Seager, CH Crawford, MH Han, J TI Diffusion, release, and uptake of hydrogen in magnesium-doped gallium nitride: Theory and experiment SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL-VAPOR-DEPOSITION; ELECTRON BEAM IRRADIATION; GAN; MG; ACTIVATION; ACCEPTORS AB The diffusion and release of H and its uptake from the gas phase are modeled for Mg-doped, wurtzite GaN using formation energies and vibration frequencies from the density-function theory. Comparison is made with rates of deuterium release and uptake measured by nuclear-reaction analysis of deuterium concentration. Good agreement is found when account is taken of a surface permeation barrier. (C) 2001 American Institute of Physics. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Myers, SM (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 25 TC 43 Z9 43 U1 3 U2 13 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2001 VL 89 IS 6 BP 3195 EP 3202 DI 10.1063/1.1347410 PG 8 WC Physics, Applied SC Physics GA 406ZZ UT WOS:000167248100020 ER PT J AU Roy, ME Nishimoto, SK Rho, JY Bhattacharya, SK Lin, JS Pharr, GM AF Roy, ME Nishimoto, SK Rho, JY Bhattacharya, SK Lin, JS Pharr, GM TI Correlations between osteocalcin content, degree of mineralization, and mechanical properties of C-Carpio rib bone SO JOURNAL OF BIOMEDICAL MATERIALS RESEARCH LA English DT Article DE osteocalcin; mineralization; nanoindentation; small-angle X-ray scattering; bone elasticity ID GAMMA-CARBOXYGLUTAMIC ACID; X-RAY-SCATTERING; K-DEPENDENT PROTEIN; VITAMIN-K; ELASTIC-MODULUS; DEFICIENT MICE; INDENTATION; MATRIX; LOAD AB Osteocalcin is one of the most abundant noncollagenous proteins in bone. It is strongly associated with the mineral phase of bone, and has long been associated as a marker of bone turnover. However, its relationship to bone composition, strength, and structure is unclear. Carp rib bone is an excellent model for the study, because osteocalcin represents almost 60% of the total extractable noncollagenous proteins found in it. Because of the abundance of osteocalcin relative to other extractable proteins, any changes in the properties of carp rib bone would be more likely influenced by the osteocalcin concentration. To test the hypotheses that the concentration of osteocalcin is reflected in other properties of bone, the correlations between the osteocalcin concentration and the mineral content, microstructural properties, and physical characteristics of the bone mineral crystals were determined utilizing radioimmunoassay (RIA), spectrophotometry, nanoindentation, and small-angle X-ray scattering (SAXS) techniques, respectively. Osteocalcin concentration was found to be correlated to the molar Ca/P ratio and inversely correlated to the elastic modulus and hardness in the longitudinal plane. This study provides evidence for a putative relationship between the concentration of osteocalcin and the microstructural mechanical properties of bone. Correlations were also found between the mechanical properties in the longitudinal plane and both the phosphate content and the molar Ca/P ratio. However, no relationships could be identified between osteocalcin concentration and several parameters of bone crystals, as determined by SAXS. (C) 2000 John Wiley & Sons, Inc. C1 Univ Memphis, Dept Biomed Engn, Memphis, TN 38152 USA. Univ Tennessee, Ctr Hlth Sci, Dept Biochem, Memphis, TN 38163 USA. Univ Tennessee, Ctr Hlth Sci, Dept Surg, Memphis, TN 38163 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN USA. Univ Tennessee, Dept Mat Sci, Knoxville, TN USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN USA. RP Rho, JY (reprint author), Univ Memphis, Dept Biomed Engn, Campus Box 526582, Memphis, TN 38152 USA. FU NIAMS NIH HHS [R01AR-38540, AR45297] NR 42 TC 32 Z9 33 U1 0 U2 6 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0021-9304 J9 J BIOMED MATER RES JI J. Biomed. Mater. Res. PD MAR 15 PY 2001 VL 54 IS 4 BP 547 EP 553 DI 10.1002/1097-4636(20010315)54:4<547::AID-JBM110>3.0.CO;2-2 PG 7 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA 388MD UT WOS:000166184000011 PM 11426600 ER PT J AU Portman, JJ Takada, S Wolynes, PG AF Portman, JJ Takada, S Wolynes, PG TI Microscopic theory of protein folding rates. I. Fine structure of the free energy profile and folding routes from a variational approach SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CONSTRAINTS INDUCE LOCALIZATION; ISOLATED POLYMER MOLECULE; INTERNAL CONSTRAINTS; SECONDARY STRUCTURE; TRANSITION-STATE; LOCAL DYNAMICS; SIMPLE-MODEL; FUNNELS; LANDSCAPES; STABILITY AB A microscopic theory of the free energy barriers and folding routes for minimally frustrated proteins is presented, greatly expanding on the presentation of the variational approach outlined previously [J. J. Portman, S. Takada, and P. G. Wolynes, Phys. Rev. Lett. 81, 5237 (1998)]. We choose the lambda -repressor protein as an illustrative example and focus on how the polymer chain statistics influence free energy profiles and partially ordered ensembles of structures. In particular, we investigate the role of chain stiffness on the free energy profile and folding routes. We evaluate the applicability of simpler approximations in which the conformations of the protein molecule along the folding route are restricted to have residues that are either entirely folded or unfolded in contiguous stretches. We find that the folding routes obtained from only one contiguous folded region corresponds to a chain with a much greater persistence length than appropriate for natural protein chains, while the folding route obtained from two contiguous folded regions is able to capture the relatively folded regions calculated within the variational approach. The free energy profiles obtained from the contiguous sequence approximations have larger barriers than the more microscopic variational theory which is understood as a consequence of partial ordering. (C) 2001 American Institute of Physics. C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Kobe Univ, Dept Chem, Kobe, Hyogo 6578501, Japan. Univ Illinois, Dept Chem, Urbana, IL 61801 USA. RP Portman, JJ (reprint author), Univ Calif Los Alamos Natl Lab, Theoret Biol & Biophys Grp, T-10 MSK710, Los Alamos, NM 87545 USA. RI Takada, Shoji/A-1163-2009 NR 60 TC 89 Z9 90 U1 1 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 2001 VL 114 IS 11 BP 5069 EP 5081 DI 10.1063/1.1334662 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 409DC UT WOS:000167368400037 ER PT J AU Portman, JJ Takada, S Wolynes, PG AF Portman, JJ Takada, S Wolynes, PG TI Microscopic theory of protein folding rates. II. Local reaction coordinates and chain dynamics SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID TRANSITION-STATE ENSEMBLE; MODE-COUPLING THEORY; LONG-TIME DYNAMICS; ENERGY-TRANSFER; INTERNAL VISCOSITY; CONFORMATIONAL TRANSITIONS; POLYMER-CHAINS; CHYMOTRYPSIN INHIBITOR-2; SMOLUCHOWSKI DYNAMICS; DILUTE-SOLUTION AB The motions involved in barrier crossing for protein folding are investigated in terms of the chain dynamics of the polymer backbone, completing the microscopic description of protein folding presented in the preceding paper. Local reaction coordinates are identified as collective growth modes of the unstable fluctuations about the saddle points in the free energy surface. The description of the chain dynamics incorporates internal friction (independent of the solvent viscosity) arising from the elementary isomerization of the backbone dihedral angles. We find that the folding rate depends linearly on the solvent friction for high viscosity, but saturates at low viscosity because of internal friction. For lambda -repressor, the calculated folding rate prefactor, along with the free energy barrier from the variational theory, gives a folding rate that agrees well with the experimentally determined rate under highly stabilizing conditions, but the theory predicts too large a folding rate at the transition midpoint. This discrepancy obtained using a fairly complete quantitative theory inspires a new set of questions about chain dynamics, specifically detailed motions in individual contact formation. (C) 2001 American Institute of Physics. C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Illinois, Dept Chem, Urbana, IL 61801 USA. Kobe Univ, Dept Chem, Kobe, Hyogo 6578501, Japan. RP Portman, JJ (reprint author), Los Alamos Natl Lab, Theoret Biol & Biophys Grp, T-10 MSK710, Los Alamos, NM 87545 USA. RI Takada, Shoji/A-1163-2009 NR 104 TC 123 Z9 124 U1 2 U2 20 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 2001 VL 114 IS 11 BP 5082 EP 5096 DI 10.1063/1.1334663 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 409DC UT WOS:000167368400038 ER PT J AU Zhang, YX Hunke, EC AF Zhang, YX Hunke, EC TI Recent Arctic change simulated with a coupled ice-ocean model SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SOUTHERN CANADIAN BASIN; SEA-ICE; NUMERICAL-MODEL; HIGH-RESOLUTION; FRAM STRAIT; HEAT-FLUX; CIRCULATION; WATER; DYNAMICS; CLIMATE AB A high-resolution coupled ice-ocean model, forced with 1983-1997 European Center for Medium-Range Weather Forecasts data, is used to explore recent Arctic change. In response to changes in atmospheric circulation, stronger cyclonic circulation is present in Arctic sea ice and upper ocean in the late 1980s and early 1990s as compared to the early 1980s, manifested as the weakening of the Beaufort Gyre and the shifting of the Transpolar Drift Stream. Corroborating previous studies, ice divergence in the central Arctic Ocean is highly correlated with surface atmospheric vorticity in summer, suggesting that summer atmospheric circulation is more important than winter for inducing interannual variability of the central Arctic ice divergence and growth rate. The weakening of the summer atmospheric cyclonic circulation from the earlier period to the later period over the Canadian Basin leads to decreased ice divergence there, which then has significant impact on the ice growth rate by reducing ice formation in fall and winter. For the 15 year period, variability in the spatial distribution of ice concentration and thickness is largely determined by the ice dynamics, which is dominated by the atmospheric circulation, except over the Greenland and Labrador Seas, where the ice thermodynamics plays a more important role. The model simulation supports the recent observations of increased presence of Atlantic Water in the Arctic Ocean. The spatial pattern of warming and salinization of the Arctic Atlantic layer follows the pathways of the strengthened boundary currents along the continental slopes and over the ridges, thereby slowly spreading more Atlantic Water downstream from the eastern Arctic into the western Arctic. The integrations with and without surface temperature restoring indicate that the restoring leads to a warmer ocean surface temperature. However, the restoring has little impact on its interannual variability for the 15 year period. C1 USN, Postgrad Sch, Dept Oceanog, Monterey, CA 93943 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Zhang, YX (reprint author), USN, Postgrad Sch, Dept Oceanog, Monterey, CA 93943 USA. EM zhangy@ucar.edu; eclare@lanl.gov NR 49 TC 21 Z9 23 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAR 15 PY 2001 VL 106 IS C3 BP 4369 EP 4390 DI 10.1029/2000JC900159 PG 22 WC Oceanography SC Oceanography GA 409WX UT WOS:000167409600002 ER PT J AU Marzari, R Sblattero, D Florian, F Tongiorgi, E Not, T Tommasini, A Ventura, A Bradbury, A AF Marzari, R Sblattero, D Florian, F Tongiorgi, E Not, T Tommasini, A Ventura, A Bradbury, A TI Molecular dissection of the tissue transglutaminase antoantibody response in celiac disease SO JOURNAL OF IMMUNOLOGY LA English DT Article ID PHAGE DISPLAY LIBRARIES; FAB FRAGMENTS; FILAMENTOUS PHAGE; HUMAN-ANTIBODIES; HIGH-AFFINITY; SELECTION; PATIENT; CLONING; GLIADIN; SERUM AB Celiac disease (CD) is an intestinal malabsorption characterized by intolerance to cereal proteins accompanied by immunological responses to dietary gliadins and tissue transglutaminase, an autoantigen located in the endomysium. Tissue transglutaminase belongs to the family of enzymes that catalyze protein cross-linking reactions and is constitutively expressed in many tissues as well as being activated during apoptosis, The role of gliadins in eliciting the immune response in CB and holy transglutaminase is linked to the primary reaction are still unclear, In this work, we report the production and analysis of six phage Ab libraries from the peripheral and intestinal lymphocytes of three CD patients, We were able to isolate Abs to transglutaminase from all intestinal lymphocytes libraries but not from those obtained from peripheral lymphocytes, This is in contrast to Abs against gliadin, which could be obtained from all libraries, indicating that the humoral response against transglutaminase occurs at the local level, whereas that against gliadin occurs both peripherally and centrally, Abs from all three patients recognized the same transglutaminase epitopes with a bias toward the use of the V(H)5 Ab variable region family, The possible role of these anti-transglutaminase Abs in the onset of CD and associated autoimmune pathologies is discussed. C1 Univ Trieste, Dipartimento Biol, I-34127 Trieste, Italy. Ist Ricovero & Cura Carattere Sperimentale, Trieste, Italy. Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. Scuola Int Super Studi Avanzati, Trieste, Italy. RP Marzari, R (reprint author), Univ Trieste, Dipartimento Biol, Via Giorgieri 5, I-34127 Trieste, Italy. NR 45 TC 116 Z9 117 U1 1 U2 2 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD MAR 15 PY 2001 VL 166 IS 6 BP 4170 EP 4176 PG 7 WC Immunology SC Immunology GA 410JW UT WOS:000167437700071 PM 11238668 ER PT J AU Schulz, H Reddmann, H Amberger, HD Kanellakopulos, B Apostolidis, C Rebizant, J Edelstein, NM AF Schulz, H Reddmann, H Amberger, HD Kanellakopulos, B Apostolidis, C Rebizant, J Edelstein, NM TI Electron structure of organometal complexes of f-elememts. 51. Synthesis, crystal, molecular and electron structure of Cp3Nd(NCCh(3))(2) SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA German DT Article DE neodymium; cyclopentadienyl ligands; crystal and molecular structures; physical properties; crystal field analysis; molecular orbital; schemes ID FIELD SPLITTING PATTERN; ELEMENTS; ADDUCTS; ABSORPTION; PARAMETERIZATION; LUMINESCENCE; STRENGTH AB Cp3Nd(NCCH3)(2) (1) crystallizes in the orthorhombic space group Pbcn with a = 13.961(2) Angstrom b = 8.484(2) Angstrom, c = 14.840(2) Angstrom, Z = 4, R = 0.0359, R-w = 0.0408 for 1191 data and I > 3 sigma (1). Like in the case of the La, Ce and Pr derivatives the Nd3+ central ion of compound 1 is pseudo trigonal bipyramidally coordinated by three eta (5)-bonded Cp rings in the equatorial plane (Nd-ring centre distances 2.561 Angstrom, 2.554 Angstrom) and two acetonitrile groups in the axial positions (Nd-N = 2.764(5) Angstrom). The absorption spectra of extremely sensitive 1 (pellets), the much more stable optically diluted Cp3La0.8Nd0.2(NCCH3)(2) (2) (Single crystals), Cp3La(NCCH3)(2) (3) (Single crystals) and Cp3Nd . NCCH3 (4) (pellets) were recorded at room and low temperatures. From the spectra obtained, truncated crystal held splitting patterns of complexes 2 and 4 were derived, and simulated by fitting the parameters of an empirical Hamiltonian. For 56 and 55 assignments, respectively, reduced r.m.s. deviations of 32.3 cm(-1) and 20.9 cm(-1) are achieved for 2 and 4. From the parameters used the experimentally based non-relativistic and relativistic molecular orbital schemes in the f range are set up for 2 and 4. On the basis of the calculated wavefunctions and eigenvalues obtained from the fits, the spectroscopic splitting factors (extracted from the EPR spectrum) of 2 and the temperature dependence of mu (2)(eff), of 1 and 4 can be explained. The existence of Cp3La(NCCH3)(2):Tb3+ (5) is proved by the luminescence spectrum of this complex. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Hamburg, Inst Anorgan & Angew Chem, D-20146 Hamburg, Germany. Forschungszentrum Karlsruhe, Inst Tech Chem, D-76021 Karlsruhe, Germany. European Commiss, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Amberger, HD (reprint author), Univ Hamburg, Inst Anorgan & Angew Chem, Martin Luther King Pl 6, D-20146 Hamburg, Germany. NR 34 TC 25 Z9 25 U1 0 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAR 15 PY 2001 VL 622 IS 1-2 BP 19 EP 32 DI 10.1016/S0022-328X(00)00854-8 PG 14 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 413JU UT WOS:000167609900003 ER PT J AU Hoffmann, MM Darab, JG Fulton, JL AF Hoffmann, MM Darab, JG Fulton, JL TI An infrared and X-ray absorption study of the equilibria and structures of chromate, bichromate, and dichromate in ambient aqueous solutions SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID RAMAN-SPECTROSCOPIC INVESTIGATIONS; HIGH-TEMPERATURES; CHROMIUM; XAFS; XANES; CONSTANT; SPECTRA; SAMPLES; REDOX; EXAFS AB The structure and equilibrium of chromate (CrO42-), bichromate (HCrO4-), and dichromate (Cr2O72-) in ambient aqueous solutions was investigated by both IR and X-ray absorption fine structure (XAFS) spectroscopy. The individual IR bands for each of these species have been identified, and quantitative analysis of the LR bands was used to examine the chemical equilibria. A dilution study at a constant, low solution pH revealed the speciation change from dichromate dominance at high total chrome concentration to bichromate dominance at low total chrome concentration, thereby unequivocally confirming the existence of the bichromate species. The equilibrium constants, obtained from the quantitative analysis of the IR data, agree well with previously reported values, The quantitative IR analysis also revealed that the asymmetric nu (as)(CrO3) stretching frequency is virtually coincident for the bi- and dichromate. The complete structural analysis of chromate, bichromate, and dichromate was obtained from an XAFS study of chromate solutions of varying total chrome concentration. The XAFS results confirm the nu (as)(CrO3) IR band assignment for both the bi- and dichromate species by showing that the first-shell structure around the central chrome atom is nearly identical for the bi-and dichromate molecular ions. Within experimental uncertainty, the Cr-O bond distance that is associated with the nu (as)(CrO3) vibrational mode was found to be identical for the bi- and dichromate structures. C1 Pacific NW Natl Lab, Fundamental Sci Div, Richland, WA 99352 USA. Pacific NW Natl Lab, Energy Sci & Technol Div, Richland, WA 99352 USA. RP Fulton, JL (reprint author), Pacific NW Natl Lab, Fundamental Sci Div, Richland, WA 99352 USA. NR 45 TC 42 Z9 44 U1 0 U2 22 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 15 PY 2001 VL 105 IS 10 BP 1772 EP 1782 DI 10.1021/jp0027041 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 413CN UT WOS:000167592500013 ER PT J AU Goeringer, DE Duckworth, DC McLuckey, SA AF Goeringer, DE Duckworth, DC McLuckey, SA TI Collision-induced dissociation in quadrupole ion traps: Application of a thermal model to diatomic ions SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID TANDEM MASS-SPECTROMETRY; COUPLED PLASMA SOURCE; UNIMOLECULAR DISSOCIATION; BLACKBODY RADIATION; PEPTIDE IONS; ACTIVATION; EXCITATION; KINETICS; ENERGY; NOISE AB Dissociation of the tantalum oxide cation, a strongly bound diatomic, is simulated for the multiple-collision environment of a quadrupole ion trap mass spectrometer using a model based on thermal unimolecular reaction theory. The intact diatomic ion is assigned a specific internal temperature at which it undergoes collisional activation and deactivation during a random walk in energy space. Collisional energy transfer is assumed to proceed via independent vibrational and rotational processes, as described by the refined impulse approximation and exponential transition probability, with dissociation occurring when the vibrational energy exceeds the rotational-energy-dependent barrier for dissociation. Processing the data from many such random walks yields the simulated dissociation kinetics and time-dependent internal energy distribution of an ion population at the specified internal temperature. Comparison of experimental dissociation rates with those obtained via simulations performed over a series of temperatures enables prediction of internal temperatures and corresponding internal energy distributions for tantalum oxide ion populations undergoing resonance excitation. Although the simulations indicate that rotational-energy transfer can lead to significantly higher dissociation rates than those associated with purely vibrational-energy transfer, the results obtained in this study suggest that ion internal temperatures in the tens of thousands of degrees are required nonetheless to dissociate a strongly bound diatomic ion such as tantalum oxide, and the experimental data demonstrate that resonance excitation in a quadrupole ion trap can achieve the necessary temperatures. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA. RP Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. EM goeringerde@ornl.gov RI McLuckey, Scott/B-2203-2009; Duckworth, Douglas/B-7171-2015 OI McLuckey, Scott/0000-0002-1648-5570; Duckworth, Douglas/0000-0002-8161-5685 NR 51 TC 21 Z9 21 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 15 PY 2001 VL 105 IS 10 BP 1882 EP 1889 DI 10.1021/jp0040289 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 413CN UT WOS:000167592500026 ER PT J AU Campbell, BJ Cheetham, AK Vogt, T Carluccio, L Parker, WO Flego, C Millini, R AF Campbell, BJ Cheetham, AK Vogt, T Carluccio, L Parker, WO Flego, C Millini, R TI The determination of Bronsted acid sites in zeolite ERS-7 by neutron and X-ray powder diffraction SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID STRUCTURE REFINEMENT; FRAMEWORK STRUCTURE; MORDENITE; CATALYSTS; PROTON; LOCATION; SYNCHROTRON; POSITIONS; ACIDITIES; ABSOLUTE AB The deuterated acid form of zeolite ERS-7 (Si/Al = 8.4) has been prepared by repeated cycles of D2O exposure and calcination. Al-27 NMR data show that the relative proportions of tetrahedral and octahedral Al in the resulting material are 70 and 30%. respectively. Three Bronsted sites were identified by a combined Rietveld refinement that simultaneously employed synchrotron X-ray powder diffraction data and neutron powder diffraction data. Final lattice parameters were a = 9.7843(1) Angstrom, b = 12.3675(1) Angstrom, and c = 22.8336(2) Angstrom, the combined R-wp factor was 6.3%. and x(2)(reduced) was 1.48. Acid deuterons were located approximately 1 A from oxygens O3, O5, and O7, with occupancy factors of 0.16(2), 0.16(3), and 0.18(2), respectively. These correpsond to 1.28(16), 0.64(12), and 1.44(16) deuterons per unit cell, respectively, for a total of 3.36(26) acid sites per unit cell, which is consistent with the tetrahedral Al content. Only deuteron D5 lies on a special position. T-O bond lengths suggest a site preference for Al at T4, T1, and possibly T2, each of which is bonded to at least one of the observed acid-site oxygens. A bridging framework oxygen site was identified in both the PND and PXD difference Fourier maps that appears to be disordered over at least two distinct sites; this corresponds to different local arrangements of Al at the neighboring T-sites. The out-of-plane framework hydroxyl tilt angles at each acid site were comparable to those of H+ SSZ-13 and D+ RHO. Acid site D7 demonstrated a significant in-plane hydroxyl tilt angle (7.5 degrees), consistent with ab initio quantum mechanical calculations. This tilt clearly indicates an Al preference for site T4 over T6. C1 Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EniTecnol SpA, I-20097 San Donato Milanese, Italy. RP Campbell, BJ (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Campbell, Branton/A-3990-2008; Vogt, Thomas /A-1562-2011 OI Vogt, Thomas /0000-0002-4731-2787 NR 55 TC 9 Z9 10 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 15 PY 2001 VL 105 IS 10 BP 1947 EP 1955 DI 10.1021/jp002751t PG 9 WC Chemistry, Physical SC Chemistry GA 413CP UT WOS:000167592600006 ER PT J AU Steele, IM Pluth, JJ Richardson, JW AF Steele, IM Pluth, JJ Richardson, JW TI Progressive changes in positive active material over the lifetime of a lead-acid battery SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 7th European Lead Battery Conference CY SEP 19-22, 2000 CL DUBLIN, IRELAND DE beta-PbO2; rapid charging; morphology; hydrogen; stoichiometry ID HYDROGEN; DIOXIDE; ELECTRODE; FAILURE; PBO2 AB Time-of-flight neutron diffraction for a series of lead-acid battery positive plate samples has shown that beta -PbO2 is not stoichiometric, but has a deficiency of Pb relative to oxygen giving Pb0.92O2 to Pb0.96O2 The Pb vacancies cause a charge deficiency that is balanced by crystallographic hydrogen on a disordered site. The position of hydrogen is typical of hydrogen bonding as has been previously proposed based on nuclear magnetic resonance spectra. With either rapid or conventional charging, the amount of hydrogen substitution decreases and the beta -PbO2 tends toward a stoichiometric composition at battery failure. High resolution SEM imaging of these and other battery samples shows a progressive change in the morphology of beta -PbO2 and these changes appear to be the same for both rapid or conventional charging. The morphology progresses from elongated, well-formed crystals to equidimensional crystals to dense clusters of crystals with a consequent reduction in surface area. Neither stoichiometry nor morphology changes necessarily contribute to battery failure, but both progressively change over the cycle life of the battery. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Steele, IM (reprint author), Univ Chicago, Dept Geophys Sci, 5734 S Ellis Ave, Chicago, IL 60637 USA. NR 13 TC 0 Z9 0 U1 3 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD MAR 15 PY 2001 VL 95 IS 1-2 BP 79 EP 84 DI 10.1016/S0378-7753(00)00610-8 PG 6 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA 411VQ UT WOS:000167520300009 ER PT J AU Crow, J Francis, I Butler, P AF Crow, J Francis, I Butler, P TI Summary of electrical test results for valve-regulated lead-acid (VRLA) batteries SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 7th European Lead Battery Conference CY SEP 19-22, 2000 CL DUBLIN, IRELAND DE valve-regulated lead-acid batteries; battery testing; battery life and performance; battery charging AB Under the auspices of the US Department of Energy, Energy Storage Systems (ESS) Program at Sandia National Laboratories, electrical tests were performed on two valve-regulated lead-acid (VRLA) batteries to compare the effects of several design improvements, evaluate their applicability to stationary applications, and determine their service lives. One battery represented a baseline design, and the other an improved design resulting from a development project. The two nine-cell, 1050-1200 A h, C-8/8 batteries were tested over a 7-year period using primarily a 100% depth of discharge and approximately a C-8/8 discharge regime. A variety of charge profiles were investigated and characterized. Both batteries reached end-of-life after several hundred cycles. This paper will describe these results and overall life data, and comparison information will be summarized. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Crow, J (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD MAR 15 PY 2001 VL 95 IS 1-2 BP 241 EP 247 DI 10.1016/S0378-7753(00)00646-7 PG 7 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA 411VQ UT WOS:000167520300027 ER PT J AU Kevrekidis, PG Rasmussen, KO Bishop, AR AF Kevrekidis, PG Rasmussen, KO Bishop, AR TI Comparison of one-dimensional and two-dimensional discrete breathers SO MATHEMATICS AND COMPUTERS IN SIMULATION LA English DT Article; Proceedings Paper CT International Conference on Nonlinear Evolution Equations and Wave Phenomena CY APR 12-15, 1999 CL ATHENS, GA SP IMACS DE intrinsic localized modes; bifurcations; linear stability analysis ID INTRINSIC LOCALIZED MODES; NONLINEAR LATTICES; DNA DENATURATION; LINEAR-STABILITY; INTERNAL-MODES; THRESHOLDS; EXISTENCE; DYNAMICS; ARRAYS AB We present the similarities and differences between one-dimensional (1D) and two-dimensional (2D) spatially localized, time periodic solutions in discrete nonlinear Hamiltonian systems. In particular, the types of modes their stability and their bifurcations are presented. We find that two dimensions, apart from offering an additional mode compared with one dimension, exhibit a much richer stability scenario. This is analyzed in detail using continuation techniques and linear stability analysis. (C) 2001 IMACS. Published by Elsevier Science B.V. 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. Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA. RP Rasmussen, KO (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM kor@lanl.gov RI Rasmussen, Kim/B-5464-2009 OI Rasmussen, Kim/0000-0002-4029-4723 NR 26 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4754 J9 MATH COMPUT SIMULAT JI Math. Comput. Simul. PD MAR 15 PY 2001 VL 55 IS 4-6 BP 449 EP 462 DI 10.1016/S0378-4754(00)00298-6 PG 14 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA 417VL UT WOS:000167854900013 ER PT J AU Noskov, VN Koriabine, M Solomon, G Randolph, M Barrett, JC Leem, SH Stubbs, L Kouprina, N Larionov, V AF Noskov, V. N. Koriabine, M. Solomon, G. Randolph, M. Barrett, J. C. Leem, S. -H. Stubbs, L. Kouprina, N. Larionov, V. TI Defining the minimal length of sequence homology required for selective gene isolation by TAR cloning SO NUCLEIC ACIDS RESEARCH LA English DT Article AB The transformation-associated recombination (TAR) cloning technique allows selective and accurate isolation of chromosomal regions and genes from complex genomes. The technique is based on in vivo recombination between genomic DNA and a linearized vector containing homologous sequences, or hooks, to the gene of interest. The recombination occurs during transformation of yeast spheroplasts that results in the generation of a yeast artificial chromosome (YAC) containing the gene of interest. To further enhance and refine the TAR cloning technology, we determined the minimal size of a specific hook required for gene isolation utilizing the Tg.AC mouse transgene as a targeted region. For this purpose a set of vectors containing a B1 repeat hook and a Tg.AC-specific hook of variable sizes (from 20 to 800 bp) was constructed and checked for efficiency of transgene isolation by a radial TAR cloning. When vectors with a specific hook that was >= 60 bp were utilized, similar to 2% of transformants contained circular YACs with the Tg.AC transgene sequences. Efficiency of cloning dramatically decreased when the TAR vector contained a hook of 40 bp or less. Thus, the minimal length of a unique sequence required for gene isolation by TAR is similar to 60 bp. No transgene-positive YAC clones were detected when an ARS element was incorporated into a vector, demonstrating that the absence of a yeast origin of replication in a vector is a prerequisite for efficient gene isolation by TAR cloning. C1 [Noskov, V. N.; Koriabine, M.; Kouprina, N.; Larionov, V.] Natl Inst Environm Hlth Sci, Mol Genet Lab, Res Triangle Pk, NC 27709 USA. [Solomon, G.; Randolph, M.; Barrett, J. C.] Natl Inst Environm Hlth Sci, Mol Carcinogenesis Lab, Res Triangle Pk, NC 27709 USA. [Leem, S. -H.] Dong A Univ, Fac Nat Sci, Dept Biol, Pusan 604714, South Korea. [Stubbs, L.] Lawrence Livermore Natl Lab, Genome Div, Livermore, CA 94550 USA. [Noskov, V. N.] St Petersburg State Univ, St Petersburg, Russia. RP Larionov, V (reprint author), NCI, Lab Biosyst & Canc, NIH, Bldg 49,Room 4-A56,49 Convent Dr, Bethesda, MD 20892 USA. EM larionov@mail.nih.gov NR 17 TC 11 Z9 11 U1 1 U2 3 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAR 15 PY 2001 VL 29 IS 6 AR e32 DI 10.1093/nar/29.6.e32 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA V17WP UT WOS:000207967600003 PM 11239009 ER PT J AU Chang, SC Shrock, R AF Chang, SC Shrock, R TI T=0 partition functions for Potts antiferromagnets on lattice strips with fully periodic boundary conditions SO PHYSICA A LA English DT Article ID GROUND-STATE ENTROPY; CHROMATIC POLYNOMIALS; ASYMPTOTIC LIMITS; SQUARE LATTICE; GRAPHS; DEGENERACY; FAMILIES AB We present exact calculations of the zero-temperature partition function for the g-state Potts antiferromagnet (equivalently, the chromatic polynomial) for families of arbitrarily long strip graphs of the square and triangular lattices with width L-y = 4 and boundary conditions that are doubly periodic or doubly periodic with reversed orientation (i.e., of torus or Klein bottle type). These boundary conditions have the advantage of removing edge effects. in the limit of infinite length, we calculate the exponent of the entropy, W(q) and determine the continuous locus B where it is singular. We also give results for toroidal strips involving "crossing subgraphs"; these make possible a unified treatment of torus and Klein bottle boundary conditions and enable us to prove that for a given strip, the locus B is the same for these boundary conditions. (C) 2001 Elsevier Science B.V. All rights reserved. C1 SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Shrock, R (reprint author), SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA. NR 32 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD MAR 15 PY 2001 VL 292 IS 1-4 BP 307 EP 345 DI 10.1016/S0378-4371(00)00544-6 PG 39 WC Physics, Multidisciplinary SC Physics GA 412FK UT WOS:000167544200025 ER PT J AU Cui, X List, FA Kroeger, DM Lee, DF Paranthaman, M Goyal, A Kang, BW Specht, ED Martin, PM Robbins, WB AF Cui, X List, FA Kroeger, DM Lee, DF Paranthaman, M Goyal, A Kang, BW Specht, ED Martin, PM Robbins, WB TI Continuous deposition of ex situ YBCO precursor films on rolling-assisted biaxially textured substrates by electron beam evaporation SO PHYSICA C LA English DT Article DE high-T-c superconductors; continuous deposition; biaxial texture; ex situ YBCO precursors; E-beam evaporation ID HIGH-TEMPERATURE SUPERCONDUCTORS; CRITICAL-CURRENT DENSITY; BUFFER LAYERS; NI TAPES; GROWTH AB A reel-to-reel electron beam evaporation system has been developed to continuously deposit Y-BaF2-Cu precursor for ex situ YBa2Cu3O7-x (YBCO) processed films, The quality of a YBCO film on biaxially textured, oxide buffered, Ni tape strongly depends on the condition of the precursor deposit. For continuous precursor deposition, a uniform cation stoichiometry (i.e., Y:Ba:Cu = 1:2:3) over the entire length of precursor film is essential. Rutherford backscattering spectrometry studies indicated that the partial pressure of water vapor during the deposition has a significant effect on cation deposition rates and the oxygen content in the precursor film. The oxygen content of the precursor is increased and the precursor stability upon exposure to air is improved by introduction of water vapor during precursor deposition. High quality precursor films with a thickness of 300 nm have been deposited on lengths of rolling-assisted, biaxially textured substrates in the reel-to-reel electron beam evaporation system. In this paper, long length precursor deposition processing will be discussed. Properties of some post-annealed YBCO films will also be presented. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. 3M Co, St Paul, MN 55144 USA. RP Cui, X (reprint author), 2 Technol Dr, Westborough, MA 01581 USA. RI Specht, Eliot/A-5654-2009; Paranthaman, Mariappan/N-3866-2015 OI Specht, Eliot/0000-0002-3191-2163; Paranthaman, Mariappan/0000-0003-3009-8531 NR 20 TC 3 Z9 5 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 MAR 15 PY 2001 VL 351 IS 2 BP 175 EP 181 DI 10.1016/S0921-4534(00)01635-X PG 7 WC Physics, Applied SC Physics GA 413XZ UT WOS:000167638000012 ER PT J AU Axt, VM Bolton, SR Neukirch, U Sham, LJ Chemla, DS AF Axt, VM Bolton, SR Neukirch, U Sham, LJ Chemla, DS TI Evidence of six-particle Coulomb correlations in six-wave-mixing signals from a semiconductor quantum well SO PHYSICAL REVIEW B LA English DT Article ID BULK GAAS; 4-WAVE-MIXING SIGNALS; CARRIER DYNAMICS; 4-PARTICLE CORRELATIONS; EXCITED SEMICONDUCTOR; EXCITONIC-MOLECULES; PHONON INTERACTION; MICROSCOPIC THEORY; COHERENT EMISSION; KINETICS AB Six-cave-mixing signals from a ZnSe quantum well ark analyzed experimentally and with a microscopic density-matrix description using the dynamics-controlled-truncation scheme. For each physically distinct combination of polarizations of the exciting pulses, the spectrum of six-wave-mixing emission is measured as a function of time delay. The experimental results are compared with calculations performed at different levels of approximation. Although the leading order contributions to six-wave-mixing signals are of fifth order in the laser field, we show that there are significant signal components that are due to at least chi ((7)) processes. The sensitivity of six-wave-mixing signals to high-order Coulomb correlations is demonstrated. Six-point density matrices are found to be indispensable for the interpretation of our experiments, while some details seem to indicate the involvement of even higher-order correlation functions. Furthermore, we find a remarkable dynamical decoupling of spectral signatures and the delay-time behavior after excitation with linearly polarized pulses. C1 Univ Munster, Inst Festkorpertheorie, D-48149 Munster, Germany. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Williams Coll, Dept Phys, Williamstown, MA 01267 USA. Univ Bremen, Inst Festkorperphys, D-28334 Bremen, Germany. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RP Axt, VM (reprint author), Univ Munster, Inst Festkorpertheorie, Wilhelm Klemm Str 10, D-48149 Munster, Germany. RI Axt, Vollrath Martin/A-7688-2008 NR 74 TC 24 Z9 24 U1 0 U2 1 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 MAR 15 PY 2001 VL 63 IS 11 AR 115303 DI 10.1103/PhysRevB.63.115303 PG 11 WC Physics, Condensed Matter SC Physics GA 413QT UT WOS:000167623800066 ER PT J AU Beck, KM Joly, AG Hess, WP AF Beck, KM Joly, AG Hess, WP TI Evidence for a surface exciton in KBr via laser desorption SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-STIMULATED DESORPTION; NONTHERMAL HALOGEN ATOMS; ALKALI-HALIDE SURFACES; DIRECTIONAL EMISSION; DEFECT FORMATION; IRRADIATION; MECHANISM; CRYSTALS; NACL AB We demonstrate that direct photoexcitation of the single crystal KBr surface leads to desorption of hyperthermal neutral bromine atoms. We have produced separately the hyperthermal and the near-thermal components of neutral halogen emission from an alkali halide. The source of hyperthermal bromine emission is attributed to decay of a surface exciton excited at photon energies below that of the bulk exciton. We argue that the frequently observed near-thermal component is derived from excitation within the bulk crystal. Our experimental data provide strong support to a theoretical excitonic emission model previously described in the literature. C1 Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Hess, WP (reprint author), Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, POB 999, Richland, WA 99352 USA. EM wayne.hess@pnl.gov NR 26 TC 26 Z9 26 U1 0 U2 2 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 MAR 15 PY 2001 VL 63 IS 12 AR 125423 DI 10.1103/PhysRevB.63.125423 PG 6 WC Physics, Condensed Matter SC Physics GA 416XW UT WOS:000167806600131 ER PT J AU Cho, JH Kim, KS Chan, CT Zhang, ZY AF Cho, JH Kim, KS Chan, CT Zhang, ZY TI Oscillatory energetics of flat Ag films on MgO(001) art. no. 113408 SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM-WELL STATES; AG/MGO(001) INTERFACE; GROWTH; PSEUDOPOTENTIALS; MORPHOLOGY; OVERLAYERS; LAYER; MODES AB The energetics and electronic structures of flat Ag films on the MgO(001) substrate are studied by first-principles density-functional calculations. An oscillatory variation of the film energetics showing the existence of multiple magic thicknesses for smootli growth is found. This oscillatory behavior correlates well with the quantum-well stales, which themselves vary with the film thickness. The results demonstrate the importance of the confined motion of the conduction electrons in stabilizing epitaxial metal films, as emphasized in a recent ''electronic growth" model. C1 Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Pohang Univ Sci & Technol, Ctr Superfunct Mat, Dept Chem, Pohang 790784, South Korea. RP Univ Texas, Dept Phys, Austin, TX 78712 USA. RI Kim, Kwang/C-7538-2012; Cho, Jun-Hyung/R-7256-2016 OI Kim, Kwang/0000-0002-6929-5359; Cho, Jun-Hyung/0000-0002-1785-1835 NR 30 TC 16 Z9 16 U1 2 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2001 VL 63 IS 11 AR 113408 DI 10.1103/PhysRevB.63.113408 PG 3 WC Physics, Condensed Matter SC Physics GA 413QT UT WOS:000167623800033 ER PT J AU Gan, S Liang, Y Baer, DR AF Gan, S Liang, Y Baer, DR TI Interplay between step anisotropy and surface phase transformation on TiO2(110) SO PHYSICAL REVIEW B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; INTRINSIC DEFECTS; STM; VISUALIZATION; OXYGEN; FILMS AB The dynamic behavior of steps on the TiO2 (110) surface was studied during the transformation from a 1 X 1 structure to a 1 X 2 structure. We found that two types of steps dominate the transformation process: (1) [001], defined as steps that run along the [001] direction; and (2) [1 (1) over bar0] defined as steps that run parallel to the [1 (1) over bar0] direction. The stoichiometric 1 x 1 surface contained mostly [001] steps. Reducing this surface caused nearly half the [001] steps to be gradually converted to [1 (1) over bar0] steps. This evolution in step structure was accompanied by growth of reconstructed 1 X 2 domains initiated mostly at the [1 (1) over bar0] step edges. On the 1 X 2 domains, the lengths of the [001] and [1 (1) over bar0] steps were approximately equal. The results of this work shed light on the step structure and correlation between the step energetics and the surface phase transformations on the TiO2 (110) surface. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Liang, Y (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. EM Yong.liang@pnl.gov RI Baer, Donald/J-6191-2013 OI Baer, Donald/0000-0003-0875-5961 NR 17 TC 4 Z9 4 U1 0 U2 2 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 MAR 15 PY 2001 VL 63 IS 12 AR 121401 PG 4 WC Physics, Condensed Matter SC Physics GA 416XW UT WOS:000167806600024 ER PT J AU Huang, ZB Lin, HQ Gubernatis, JE AF Huang, ZB Lin, HQ Gubernatis, JE TI Pairing, charge, and spin correlations in the three-band Hubbard model SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM-MONTE-CARLO; HIGH-TC SUPERCONDUCTORS; FERMION GROUND-STATES; TWO-DIMENSIONAL CUO2; 2 DIMENSIONS; PARAMETERS; SYSTEMS AB Using the constrained path Monte Carlo method, we simulated the two-dimensional; three-band Hubbard model to study pairing, charge, and spin correlations as a function of electron and hole doping and the Coulomb repulsion V-pd between charges on neighboring Cu and O lattice sites. As a function of distance, both the d(x2-y2)-wave and extended s-wave pairing correlations decayed quickly. In the charge-transfer regime, increasing V-pd decreased the long-range part of the correlation functions in both channels, while in the mixed-valent regime, it increased the long-range part of the s-wave behavior but decreased that of the d-wave behavior. Still the d-wave behavior dominated. At a given doping, increasing V-pd increased the spin-spin correlations in the charge-transfer regime but decreased them in the mixed-valent regime. Also, increasing Vpd suppressed the charge-charge correlations between neighboring Cu and O sites. Electron and hole doping away from half-filling was accompanied by a rapid suppression of antiferromagnetic correlations. Our results suggest that adding a repulsive V-pd to the model does not enhance its tendency toward superconductivity even though the behavior of the spin structure factor is consistent with the properties of some high-temperature superconducting materials. C1 Chinese Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Lin, HQ (reprint author), Chinese Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China. NR 33 TC 8 Z9 8 U1 0 U2 3 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 MAR 15 PY 2001 VL 63 IS 11 AR 115112 DI 10.1103/PhysRevB.63.115112 PG 9 WC Physics, Condensed Matter SC Physics GA 413QT UT WOS:000167623800045 ER PT J AU Kay, AW de Abajo, FJG Yang, SH Arenholz, E Mun, BS Mannella, N Hussain, Z Van Hove, MA Fadley, CS AF Kay, AW de Abajo, FJG Yang, SH Arenholz, E Mun, BS Mannella, N Hussain, Z Van Hove, MA Fadley, CS TI Multiatom resonant photoemission SO PHYSICAL REVIEW B LA English DT Article ID NEIGHBOR ATOMIC IDENTITIES; PHOTOELECTRONS; SCATTERING; AUGER AB We present experimental and theoretical results related to multiatom resonant photoemission, in which the photoelectron intensity from a core level on one atom is influenced by a core-level absorption resonance on another. We point out that some prior experimental data has been strongly influenced by detector nonlinearity and that the effects seen in new corrected data are smaller and of different form. Corrected data are found to be well described by an extension of resonant photoemission theory to the interatomic case, provided that interactions beyond the usual second-order Kramers-Heisenberg treatment are included. This microscopic theory is also found to simplify under certain conditions so as to yield results equivalent to a classical x-ray optical approach, with the latter providing an alternative, although less detailed and general, physical picture of these effects. The potential utility of these effects as near-neighbor probes, as well as their implications for x-ray emission and x-ray scattering experiments, are also discussed. C1 Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. UPV, EHU, CSIC, Ctr Mixto, San Sebastian, Spain. RP Kay, AW (reprint author), Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. RI Van Hove, Michel/A-9862-2008; Garcia de Abajo, Javier/A-6095-2009; CSIC-UPV/EHU, CFM/F-4867-2012; Mun, Bongjin /G-1701-2013; DONOSTIA INTERNATIONAL PHYSICS CTR., DIPC/C-3171-2014 OI Van Hove, Michel/0000-0002-8898-6921; Garcia de Abajo, Javier/0000-0002-4970-4565; NR 37 TC 47 Z9 47 U1 0 U2 11 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 MAR 15 PY 2001 VL 63 IS 11 AR 115119 DI 10.1103/PhysRevB.63.115119 PG 9 WC Physics, Condensed Matter SC Physics GA 413QT UT WOS:000167623800052 ER PT J AU Liebsch, A Kim, BO Plummer, EW AF Liebsch, A Kim, BO Plummer, EW TI Collective excitations in adsorbed alkali-metal films: Critical analysis of photofield and electron-energy-loss spectra for K on Al(111) SO PHYSICAL REVIEW B LA English DT Article ID SURFACE-PLASMON; ELECTROMAGNETIC-FIELDS; NORMAL-MODES; LAYERS; OVERLAYERS; ADSORPTION; PHOTOEMISSION; DISPERSION; JELLIUM AB Photoyield and electron-energy-loss measurements were combined to elucidate the nature of the collective electronic modes of thin K films on Al(111). Various kinds of overlayer modes are observed whose frequency depends on coverage and pal allel momentum. While photoemission is limited to the long-wavelength Limit, electron-energy-loss spectroscopy provides information on the full q(parallel to) dispersion. Surprisingly, the loss frequencies measured at q(parallel to)=0 differ appreciably from those observed in the photoyield spectra. They also exhibit a qualitatively different dependence on coverage. Calculations based on the rime-dependent density-functional approach are carried out for both spectroscopies with the aim of analyzing the excitation spectra, in particular, the frequencies and relative intensities of overlayer modes as a function of coverage. We argue that for a consistent interpretation of photoyield and electron-energy-loss spectra it is crucial to account for the nonanalytic dispersion of the modes and their spectral weights at small q(parallel to) and for the finite angular resolution of the detector. The apparent discrepancies between the two spectroscopies are then resolved and the observed dispersions are in agreement with the density-functional predictions. C1 Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Forschungszentrum Julich, Inst Festkorperforsch, Postfach 1913, D-52425 Julich, Germany. NR 44 TC 13 Z9 13 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 MAR 15 PY 2001 VL 63 IS 12 AR 125416 DI 10.1103/PhysRevB.63.125416 PG 10 WC Physics, Condensed Matter SC Physics GA 416XW UT WOS:000167806600124 ER PT J AU Paiva, T Scalettar, RT Huscroft, C McMahan, AK AF Paiva, T Scalettar, RT Huscroft, C McMahan, AK TI Signatures of spin and charge energy scales in the local moment and specific heat of the half-filled two-dimensional Hubbard model SO PHYSICAL REVIEW B LA English DT Article ID T-C SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; INFINITE DIMENSIONS; FERMION SYSTEMS; PHASE-DIAGRAM; BETHE-ANSATZ; NORMAL-STATE; PSEUDOGAP; SIMULATIONS; CURVES AB Local moment formation driven by the on-site repulsion U is one of the most fundamental features in the Hubbard model. At the simplest level, the temperature dependence of the local moment is expected to have a single structure at T similar toU, reflecting the suppression of the double occupancy. In this paper we show low-temperature quantum Monte Carlo data for half-filling which emphasize that the local moment also has a signature at a lower energy scale which previously had been thought to characterize only the temperatures below which moments on different sites begin to correlate locally. We discuss implications of these results for the structure of the specific heat, and connections to quasiparticle resonance and pseudogap formation in the density of states. C1 Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Univ Fed Rio de Janeiro, Inst Fis, Cx P 68-528, BR-21945970 Rio De Janeiro, Brazil. RI Paiva, Thereza/B-9778-2013 OI Paiva, Thereza/0000-0002-4199-3809 NR 42 TC 41 Z9 41 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 MAR 15 PY 2001 VL 63 IS 12 AR 125116 DI 10.1103/PhysRevB.63.125116 PG 11 WC Physics, Condensed Matter SC Physics GA 416XW UT WOS:000167806600044 ER PT J AU Raviswaran, A Liu, CP Kim, J Cahill, DG Gibson, JM AF Raviswaran, A Liu, CP Kim, J Cahill, DG Gibson, JM TI Evolution of coherent islands during strained-layer Volmer-Weber growth of Si on Ge(111) SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-MICROSCOPY; SHAPE TRANSITION; EPITAXIAL-GROWTH; GE/SI ISLANDS; MORPHOLOGY; FILMS; NUCLEATION; RELAXATION; GE(001) AB Deposition of Si on Ge(111) at growth temperatures of 450-500 degreesC by molecular beam epitaxy produces high densities (>10(11) cm(-2)) of small (width approximate to 10 nm) coherent three-dimensional Si islands. At intermediate temperatures, 550-600 degreesC, islands become incoherent with the Ge(111) substrate when their widths exceed approximate to 18 nm. The activation energy for the maximum island density prior to coalescence is approximate to 1.7 eV over a wide temperature range 450-650 degreesC. C1 Univ Illinois, Dept Mat Sci, Urbana, IL 61801 USA. Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Raviswaran, A (reprint author), Univ Illinois, Dept Mat Sci, Urbana, IL 61801 USA. RI Gibson, Murray/E-5855-2013; Cahill, David/B-3495-2014 OI Gibson, Murray/0000-0002-0807-6224; NR 30 TC 16 Z9 17 U1 0 U2 3 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 MAR 15 PY 2001 VL 63 IS 12 AR 125314 DI 10.1103/PhysRevB.63.125314 PG 5 WC Physics, Condensed Matter SC Physics GA 416XW UT WOS:000167806600081 ER PT J AU Reboredo, FA Zhang, SB Zunger, A AF Reboredo, FA Zhang, SB Zunger, A TI Hydrogen-induced instability on the flat Si(001) surface via steric repulsion SO PHYSICAL REVIEW B LA English DT Article ID SATURATED SI(100) SURFACE; SILICON; STEPS; PHASE; CHEMISORPTION; MECHANISM AB The exposure of the miscut Si(001) surface to H gives rise to a rich sequence of stable step structures as a function of the H chemical potential. First-principles calculations of step-formation energies show that the formation of steps on the (2 x 1) reconstructed surface requires energy, but that on the (1 x 1) surface, steps form exothermically, This explains surface roughness at high H chemical potentials. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina. RI Reboredo, Fernando/B-8391-2009; Zunger, Alex/A-6733-2013; Krausnick, Jennifer/D-6291-2013; Zhang, Shengbai/D-4885-2013 OI Zhang, Shengbai/0000-0003-0833-5860 NR 25 TC 17 Z9 17 U1 1 U2 6 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 MAR 15 PY 2001 VL 63 IS 12 AR 125316 DI 10.1103/PhysRevB.63.125316 PG 5 WC Physics, Condensed Matter SC Physics GA 416XW UT WOS:000167806600083 ER PT J AU Riva, C Peeters, FM Varga, K AF Riva, C Peeters, FM Varga, K TI Magnetic field dependence of the energy of negatively charged excitons in semiconductor quantum wells SO PHYSICAL REVIEW B LA English DT Article ID 2-DIMENSIONAL ELECTRON-GAS; OPTICAL-ABSORPTION; GROUND-STATE; D CENTERS; HOLE; MAGNETOEXCITONS; TRANSLATIONS AB We present a variational calculation of the spin-singlet and spin-triplet states of a negatively charged exciton (trion) confined to a single quantum well in the presence of a perpendicular magnetic field. We calculated the probability density and the pair correlation function of the singlet and triplet trion states. The dependence of the energy levels and of the binding energy on the well width and on the magnetic field strength was investigated. We compared our results with the available experimental data on GaAs/AlGaAs quantum wells and find that in the low-magnetic-field region (B<18 T) the observed transitions are those of the singlet and the dark triplet trion (with angular momentum L-z= -1), while for high magnetic fields (B>25 T) the dark trion becomes optically inactive and possibly a transition to a bright triplet trion (angular momentum L-z=0) state is observed. C1 Univ Instelling Antwerp, Dept Nat Kunde, B-2610 Antwerp, Belgium. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Riva, C (reprint author), Univ Instelling Antwerp, Dept Nat Kunde, Univ Pl 1, B-2610 Antwerp, Belgium. EM riva@uia.ua.ac.be; peeters@uia.ua.ac.be RI Varga, Kalman/A-7102-2013; CMT, UAntwerpen Group/A-5523-2016 NR 35 TC 77 Z9 78 U1 0 U2 9 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 MAR 15 PY 2001 VL 63 IS 11 AR 115302 DI 10.1103/PhysRevB.63.115302 PG 8 WC Physics, Condensed Matter SC Physics GA 413QT UT WOS:000167623800065 ER PT J AU Zhong, JX Zhang, TJ Zhang, ZY Lagally, MG AF Zhong, JX Zhang, TJ Zhang, ZY Lagally, MG TI Island-corner barrier effect in two-dimensional pattern formation at surfaces SO PHYSICAL REVIEW B LA English DT Article ID DIFFUSION-LIMITED AGGREGATION; FIELD-ION MICROSCOPE; HOMOEPITAXIAL GROWTH; EDGE DIFFUSION; EPITAXIAL-GROWTH; DENDRITIC GROWTH; FRACTAL GROWTH; METAL-SURFACES; SELF-DIFFUSION; NUCLEATION AB Using rate-equation analysis, kinetic Monte Carlo simulations, and embedded-atom model calculations, we establish the crucial importance of island-corner crossing in determining the island morphology during submonolayer epitaxy. We show that compact islands can be formed only if adatoms can frequently cross island corners; conversely, without effective corner crossing the islands must be noncompact with fractional dimensionality. These conclusions provide the basis for understanding initial island morphologies in existing experiments. DOI: 10.1103/PhysRevB.63.113403. C1 Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Wisconsin, Madison, WI 53706 USA. RP Zhong, JX (reprint author), Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. NR 36 TC 27 Z9 30 U1 3 U2 7 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 MAR 15 PY 2001 VL 63 IS 11 AR 113403 DI 10.1103/PhysRevB.63.113403 PG 3 WC Physics, Condensed Matter SC Physics GA 413QT UT WOS:000167623800028 ER PT J AU Arkani-Hamed, N Dimopoulos, S March-Russell, J AF Arkani-Hamed, N Dimopoulos, S March-Russell, J TI Stabilization of submillimeter dimensions: The new guise of the hierarchy problem SO PHYSICAL REVIEW D LA English DT Article ID EXTRA DIMENSIONS; 3-BRANE UNIVERSE; TEV; UNIFICATION; MILLIMETER; COSMOLOGY AB A new framework for solving the hierarchy problem was recently proposed which does not rely on low energy supersymmetry or technicolor. The fundamental Planck mass is at TeV and the observed weakness of gravity at long distances is due to the existence of new submillimeter spatial dimensions. In this picture the standard model fields are localized to a (3 + 1)-dimensional wall or ''3-brane.'' The hierarchy problem becomes isomorphic to the problem of the largeness of the extra dimensions. This is in turn inextricably linked to the cosmological constant problem, suggesting the possibility of a common solution. The radii of the extra dimensions must be prevented from both expanding to too great a size, and collapsing to the fundamental Planck length TeV-1. In this paper we propose a number of mechanisms addressing this question. We argue that a positive bulk cosmological constant <()over bar> can stabilize the internal manifold against expansion, and that the value of <()over bar> is not unstable to radiative corrections provided that the supersymmetries of string theory are broken by dynamics on our 3-brane. We further argue that the extra dimensions can be stabilized against collapse in a phenomenologically successful way by either of two methods: (1) large, topologically conserved quantum numbers associated with higher-form bulk U(1) gauge fields, such as the naturally occurring Ramond-Ramond gauge fields, or the winding number of bulk scalar fields; (2) the brane-lattice crystallization of a large number of 3-branes in the bulk. These mechanisms are consistent with theoretical, laboratory, and cosmological considerations such as the absence of large time variations in Newton's constant during and after primordial nucleosynthesis, and millimeter-scale tests of gravity. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, Dept Phys, Stanford, CA 94305 USA. CERN, Div Theory, CH-1211 Geneva, Switzerland. RP Arkani-Hamed, N (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 22 TC 97 Z9 97 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 MAR 15 PY 2001 VL 63 IS 6 AR 064020 DI 10.1103/PhysRevD.63.064020 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 411KV UT WOS:000167500000040 ER PT J AU Burles, S Nollett, KM Turner, MS AF Burles, S Nollett, KM Turner, MS TI What is the big-bang-nucleosynthesis prediction for the baryon density and how reliable is it? art. no. 063512 SO PHYSICAL REVIEW D LA English DT Article ID LOCAL INTERSTELLAR-MEDIUM; HIGH DEUTERIUM ABUNDANCE; LY-ALPHA FOREST; PRIMORDIAL NUCLEOSYNTHESIS; LITHIUM DEPLETION; LYMAN-ALPHA; UNCERTAINTIES; CONSTRAINTS; UNIVERSE; NEUTRINO AB Together, the standard theory of big-bang nucleosynthesis (BBN) and the primeval deuterium abundance now very precisely peg the baryon density. Based upon our analysis of the deuterium data and the theoretical uncertainties associated with the BBN predictions, we determine Omega (B)h(2) = 0.020 +/- 0.002 (95% C.L.), with the uncertainty from the measured deuterium abundance about twice that from the predicted abundance. We discuss critically the reliability of the BBN baryon density, and in light of possible systematic uncertainties also derive a very conservative range. We conclude that within the standard cosmology and standard theory of BBN a baryon density Omega (B)h(2)=0.032 (the central value implied by recent CMB anisotropy measurements) simply cannot be accommodated. C1 Fermilab Natl Accelerator Lab, Expt Astrophys Grp, Batavia, IL 60510 USA. Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA. Univ Chicago, Enrico Fermi Inst, Dept Phys, Chicago, IL 60637 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Fermilab Natl Accelerator Lab, NASA Fermilab Astrophys Ctr, Batavia, IL 60510 USA. RP Fermilab Natl Accelerator Lab, Expt Astrophys Grp, POB 500, Batavia, IL 60510 USA. OI Nollett, Kenneth/0000-0002-0671-320X NR 64 TC 93 Z9 93 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 MAR 15 PY 2001 VL 63 IS 6 AR 063512 DI 10.1103/PhysRevD.63.063512 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 411KV UT WOS:000167500000020 ER PT J AU Csaki, C Erlich, J Hollowood, TJ Terning, J AF Csaki, C Erlich, J Hollowood, TJ Terning, J TI Holographic renormalization group and cosmology in theories with quasilocalized gravity SO PHYSICAL REVIEW D LA English DT Article ID SUNDRUM BRANE WORLD; ONE EXTRA DIMENSION; DOMAIN-WALLS; METASTABLE GRAVITONS; INFINITELY LARGE; STRING THEORY; BLACK-HOLES; MODELS; COMPACTIFICATION; SUPERGRAVITY AB We study the long distance behavior of brane theories with quasilocalized gravity. The five-dimensional (5D) effective theory at large scales follows from a holographic renormalization group flow. As intuitively expected, the graviton is effectively four dimensional at intermediate scales and becomes five dimensional at large scales. However, in the holographic effective theory the essentially 4D radion dominates at long distances and gives rise to scalar antigravity. The holographic description shows that at large distances the Gregory-Rubakov-Sibiryakov (GRS) model is equivalent to the model recently proposed by Dvali, Gabadadze, and Porrati (DGP), where a tensionless brane is embedded into 5D Minkowski space, with an additional induced 4D Einstein-Hilbert term on the brane. In the holographic description the radion of the GRS model is automatically localized on the tensionless brane, and provides the ghostlike field necessary to cancel the extra graviton polarization of the DGP model. Thus, there is a holographic duality between these theories. This analysis provides physical insight into how the GRS model works at intermediate scales; in particular it sheds light on the size of the width of the graviton resonance, and also demonstrates how the holographic renormalization group can be used as a practical tool for calculations. C1 Los Alamos Natl Lab, Div Theory T8, Los Alamos, NM 87545 USA. Univ Wales Swansea, Dept Phys, Swansea SA2 8PP, W Glam, Wales. Harvard Univ, Dept Phys, Cambridge, MA 02138 USA. RP Los Alamos Natl Lab, Div Theory T8, POB 1663, Los Alamos, NM 87545 USA. EM csaki@lanl.gov; erlich@lanl.gov; pyth@skye.lanl.gov; terning@schwinger.harvard.edu OI Terning, John/0000-0003-1367-0575 NR 88 TC 32 Z9 32 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 MAR 15 PY 2001 VL 63 IS 6 AR 065019 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 411KV UT WOS:000167500000077 ER PT J AU Csaki, C Graesser, ML Kribs, GD AF Csaki, C Graesser, ML Kribs, GD TI Radion dynamics and electroweak physics SO PHYSICAL REVIEW D LA English DT Review ID RANDALL-SUNDRUM MODEL; GAUSS-BONNET INTERACTION; LARGE EXTRA DIMENSIONS; EFFECTIVE-FIELD THEORY; BRANE-WORLD; MODULUS STABILIZATION; RENORMALIZATION-GROUP; METASTABLE GRAVITONS; TECHNICOLOR THEORIES; LOCALIZED GRAVITY AB The dynamics of a stabilized radion in the Randall-Sundrum model with two branes is investigated, and the effects of the radion on electroweak precision observables are evaluated. The radius is assumed to he stabilized using a bulk scalar field as suggested by Goldberger and Wise. First the mass and the wave function of the radion is determined including the back reaction of the bulk stabilization field on the metric, giving a typical radion mass of the order of the weak scale. This is demonstrated by a perturbative computation of the radion wave function. A consequence of the background configuration for the scalar field is that after including the back reaction the Kaluza-Klein slates of the bulk scalars couple directly to the standard model fields on the TeV brane. Some cosmological implications are discussed, and in particular it is found that the shift in the radion at late times is in agreement with the four-dimensional effective theory result. The effect of the radion on the oblique parameters is evaluated using an effective theory approach. In the absence of a curvature-scalar Higgs mixing operator, these corrections are small and give a negative contribution to S. In the presence of such a mixing operator, however, the corrections can be sizable due to the modified Higgs and radion couplings. C1 Univ Calif Los Alamos Natl Lab, Theory Div T8, Los Alamos, NM 87545 USA. Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA. RP Csaki, C (reprint author), Univ Calif Los Alamos Natl Lab, Theory Div T8, POB 1663, Los Alamos, NM 87545 USA. EM csaki@lanl.gov; graesser@scipp.ucsc.edu; kribs@pheno.physics.wisc.edu NR 142 TC 251 Z9 251 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 MAR 15 PY 2001 VL 63 IS 6 AR 065002 DI 10.1103/PhysRevD.63.065002 PG 23 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 411KV UT WOS:000167500000060 ER PT J AU Gentle, AP Holz, DE Kheyfets, A Laguna, P Miller, WA Shoemaker, DM AF Gentle, AP Holz, DE Kheyfets, A Laguna, P Miller, WA Shoemaker, DM TI Constant crunch coordinates for black hole simulations SO PHYSICAL REVIEW D LA English DT Article ID RELATIVITY AB We reinvestigate the utility of time-independent constant mean curvature foliations for the numerical simulation of a single spherically symmetric black hole. Each spacelike hypersurface of such a foliation is endowed with the same constant value of the trace of the extrinsic curvature tensor K. Of the three families of K-constant surfaces possible (classified according to their asymptotic behaviors), we single out a subfamily of singularity avoiding surfaces that may be particularly useful, and provide an analytic expression for the closest approach such surfaces make to the singularity. We then utilize a nonzero shift to yield families of K-constant surfaces which (1) avoid the black hole singularity, and thus the need to excise the singularity, (2) are asymptotically null, aiding in gravity wave extraction, (3) cover the physically relevant part of the spacetime, (4) are well behaved (regular) across the horizon, and (5) are static under evolution, and therefore have no "grid stretching/sucking" pathologies. Preliminary numerical runs demonstrate that we can stably evolve a single spherically symmetric static black hole using this foliation. We wish to emphasize that this coordinatization produces K-constant surfaces for a single black hole spacetime that are regular, static, and stable throughout their evolution. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87544 USA. Univ Calif Santa Barbara, Inst Theoret Phys, Santa Barbara, CA 93106 USA. N Carolina State Univ, Dept Math, Raleigh, NC 27695 USA. Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA. Penn State Univ, Ctr Gravitat Phys & Geometry, University Pk, PA 16802 USA. RP Gentle, AP (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, T-6,MS B288, Los Alamos, NM 87544 USA. EM apg@lanl.gov; deholz@itp.ucsb.edu; kheyfets@math.ncsu.edu; pablo@astro.psu.edu; wam@lanl.gov; deirdre@astro.psu.edu NR 12 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 MAR 15 PY 2001 VL 63 IS 6 AR 064024 DI 10.1103/PhysRevD.63.064024 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 411KV UT WOS:000167500000044 ER PT J AU Baier, R Mueller, AH Schiff, D Son, DT AF Baier, R Mueller, AH Schiff, D Son, DT TI "Bottom-up" thermalization in heavy ion collisions SO PHYSICS LETTERS B LA English DT Article ID GLUON DISTRIBUTION-FUNCTIONS; RADIATIVE ENERGY-LOSS; NUCLEAR COLLISIONS; CHEMICAL EQUILIBRATION; QUARKS; QCD AB We describe how thermalization occurs in heavy ion collisions in the framework of perturbative QCD. When the saturation scale es is large compared to Lambda (QCD) thermalization takes place during a time of order alpha (-13/5)Q(s)(-1) and the maximal temperature achieved is alpha (2/5) Q(S). (C) 2001 Published by Elsevier Science B.V. C1 Univ Paris 11, LPT, F-91405 Orsay, France. Columbia Univ, Dept Phys, New York, NY 10027 USA. Brookhaven Natl Lab, Res Ctr, RIKEN, Upton, NY 11973 USA. Univ Bielefeld, Fak Phys, D-33501 Bielefeld, Germany. RP Schiff, D (reprint author), Univ Paris 11, LPT, Bat 210, F-91405 Orsay, France. NR 27 TC 320 Z9 322 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 15 PY 2001 VL 502 IS 1-4 BP 51 EP 58 DI 10.1016/S0370-2693(01)00191-5 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 415AG UT WOS:000167697900005 ER PT J AU Weisman, JL Lee, TJ Head-Gordon, M AF Weisman, JL Lee, TJ Head-Gordon, M TI Electronic spectra and ionization potentials of a stable class of closed shell polycyclic aromatic hydrocarbon cations SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA English DT Article DE electronic spectra; ionization potentials; PAH; DFT ID DIFFUSE INTERSTELLAR BANDS; DENSITY-FUNCTIONAL THEORY; EXCITATION-ENERGIES; ASTROPHYSICAL IMPLICATIONS; PHOTODISSOCIATION REGIONS; PAH; SPECTROSCOPY; ABSORPTION; CHEMISTRY; APPROXIMATION AB Due to their stability, closed shell polycyclic aromatic hydrocarbon (PAH) cations are possible candidates as carriers for some of the diffuse interstellar bands (DIBs). The electronic absorption spectra and ionization potentials of several closed shell PAH cations are determined in this study. We use density functional theory (DFT) at the BLYP/6-31G* level to determine the ionization potentials and thus confirm the stability of the PAH cations of interest. We use time-dependent density functional theory (TDDFT), again at the BLYP/6-31G* level, to calculate the vertical excitation energies and oscillator strengths of the PAH cations. We observe dominant single absorptions within the DIB spectral region of interest in all of the PAH cation spectra except for the smallest member of the series. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. NASA, Ames Res Ctr, Moffett Field, CA 94035 USA. RP Head-Gordon, M (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Lee, Timothy/K-2838-2012 NR 32 TC 32 Z9 32 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1386-1425 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD MAR 15 PY 2001 VL 57 IS 4 SI SI BP 931 EP 945 DI 10.1016/S1386-1425(00)00454-6 PG 15 WC Spectroscopy SC Spectroscopy GA 418RY UT WOS:000167906200024 PM 11345264 ER PT J AU Wang, HL McBranch, DW Donohoe, RJ Xu, S Kraabel, B Chen, LH Whitten, D Helgeson, R Wudl, F AF Wang, HL McBranch, DW Donohoe, RJ Xu, S Kraabel, B Chen, LH Whitten, D Helgeson, R Wudl, F TI Highly efficient energy and charge transfer in thin self-assembled multilayered polymer films SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE self-assembly; poly(phenylene vinylene) derivative; photoluminescenc; fullerene and derivatives AB We report the synthesis and characterization of multilayer self-assembled polymer films made from a water-soluble conjugated polymer, poly(2,5-methoxy-propyloxy sulfonate phenylene vinylene) (MPS-PPV). We observe a red shift, of both the absorption and fluorescence spectra with increasing numbers of active MPS-PPV layers. We attribute this red shift to changing polymer conformation and efficient energy transfer. Upon adding a water-soluble C-60 Or C-60-VBA copolymer top layer, the luminescence spectrum is strongly quenched due to charge transfer. The estimated charge transfer quantum efficiency from PL quenching is similar to 95%. We discuss in detail the unidirectional energy transfer followed by charge transfer in the self-assembled multilayered films. C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90024 USA. RP Wang, HL (reprint author), Univ Calif Los Alamos Natl Lab, Biosci Div, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 17 Z9 18 U1 0 U2 7 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 121 IS 1-3 SI SI BP 1367 EP 1368 DI 10.1016/S0379-6779(00)00873-0 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 434TD UT WOS:000168831200129 ER PT J AU Savvate'ev, V Friedl, JH Zou, L Christensen, K Oldham, W Rothberg, LJ Chen-Esterlit, Z Kopelman, R Shinar, J AF Savvate'ev, V Friedl, JH Zou, L Christensen, K Oldham, W Rothberg, LJ Chen-Esterlit, Z Kopelman, R Shinar, J TI Nanosecond electroluminescence (EL) spikes at the voltage turn-off from a small molecular organic light-emitting device (OLED) SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE transient electroluminescence nanosecond electroluminescence; EL spike; 4,4 '-bis(2,2 '-diphenyl vinyl)-1,1 '-biphenyl (DPVBi) ID TRANSIENT ELECTROLUMINESCENCE; DIODES; CATHODE AB Nanosecond EL spikes observed when multilayer blue 4,4'-bis(2,2' -diphenyl vinyl)-1,1' -biphenyl (DPVBi)/AlOx/Al-based OLEDs are excited by rectangular voltage pulses are described. The spikes occur at the voltage turn-off and exceed the cw brightness by up to x10. Time-resolved CCD images show that the uniform emission from most of the OLED surface decays with a single constant tau (1) = 13 +/- 3 ns. In the brighter areas of increased electron injection such as cathode edges and morphological defects, a second slower decay time 20 as < tau (2) < 1 mus is observed, apparently due to release of carriers from localized trap states in the organic/cathode interface, At a bias of 10 V the amplitude of the spike is found to peak at a pulse duration of similar to 20 mus. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Univ Michigan, Sch Med, Dept Microbiol & Immunol, Ann Arbor, MI 48109 USA. Univ Rochester, Dept Chem, Rochester, NY 14627 USA. Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA. RP Shinar, J (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. RI Christensen, Kenneth/D-3460-2017 NR 7 TC 7 Z9 7 U1 2 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 121 IS 1-3 SI SI BP 1713 EP 1714 DI 10.1016/S0379-6779(00)01528-9 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 434TD UT WOS:000168831200289 ER PT J AU Lin, Y Eldridge, JE Wang, HH Kini, AM Schlueter, J AF Lin, Y Eldridge, JE Wang, HH Kini, AM Schlueter, J TI Raman studies of organic superconductors SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE infrared and Raman spectroscopy; organic superconductors; magnetic phase transitions AB The temperature-dependence of the frequency of one of the components of the v(9) (A(g)) doublet in the Raman spectra of several organic superconductors has been measured. The frequency of this mode was observed to soften below 100K, in those compounds in which NMR data indicates antiferromagnetic oscillations in the same temperature range. This is evidence for spin-phonon interactions. C1 Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada. Argonne Natl Lab, Div Mat & Chem Sci, Argonne, IL 60439 USA. RP Eldridge, JE (reprint author), Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada. RI Kini, Aravinda/F-4467-2012 NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 709 EP 710 DI 10.1016/S0379-6779(00)01186-3 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500014 ER PT J AU Symington, JA Singleton, J Nam, MS Ardavan, A Kurmoo, M Schlueter, JA Day, P AF Symington, JA Singleton, J Nam, MS Ardavan, A Kurmoo, M Schlueter, JA Day, P TI Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in kappa-(BEDT-TTF)(2)Cu(NCS)(2). SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE organic superconductors; superconducting phase transitions; magnetic measurements ID ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)(2)CU(NCS)(2); FIELD AB Magnetic measurements show that the quasi-two-dimensional superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) enters a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state below similar to 5.5 K in exactly in-plane magnetic fields similar to 19 - 24 T. C1 Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. IPCMS, F-67037 Strasbourg, France. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. UCL Royal Inst Great Britain, London W1X 4BS, England. RP Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England. EM j.singleton1@physics.ox.ac.uk NR 12 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 711 EP 712 DI 10.1016/S0379-6779(00)01418-1 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500015 ER PT J AU Kini, AM Schlueter, JA Ward, BH Geiser, UW Wang, HH AF Kini, AM Schlueter, JA Ward, BH Geiser, UW Wang, HH TI On the "inverse" isotope effect in organic superconductors: new findings and implications SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE organic superconductors; BEDT-TTF or ET; isotope effect on T-c; BCS theory AB The "inverse" deuterium isotope effect, previously found in kappa-(BEDT-TTF)(2)Cu(NCS)(2), is also found in two other BEDT-TTF based superconductors with different packing motifs and different types of anions. Remarkably, the magnitude of the isotope shift is essentially identical in all three superconductors, ca. +0.26 +/- 0.06 K. These results, when taken together with the recent results of Lang et al. on the uniaxial pressure derivatives of T-c, suggest that the "inverse" isotope effect may not have a direct relationship to the pairing mechanism but instead is a reflection of the change in the "internal lattice pressure". C1 Argonne Natl Lab, Dept Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Mat Sci Div, Argonne, IL 60439 USA. RP Kini, AM (reprint author), Argonne Natl Lab, Dept Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Kini, Aravinda/F-4467-2012 NR 9 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 713 EP 714 DI 10.1016/S0379-6779(00)01201-7 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500016 ER PT J AU Ragot, F Ivanov, V Wery, J Garcia, A Perry, DL Ouvrard, G Faulques, E AF Ragot, F Ivanov, V Wery, J Garcia, A Perry, DL Ouvrard, G Faulques, E TI Spectroscopy of a Eu(III)-imidazolate complex SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE imidazole; semi-empirical calculations; Raman spectroscopy; photoluminescence; X-ray absorption spectroscopy AB We have performed semi-empirical calculations on a Eu(III)-imidazole complex. We use a Scaled Quantum Mechanical Force field approach from the MOPAC software. We obtain molecular force constants used in the normal mode calculation to modelize experimental Raman frequencies. Furthermore, we discuss the structure and the electronic properties of this complex by means of spectroscopic techniques such as photoluminescence and X-Ray Absorption Near-edge Spectroscopy (XANES). C1 Inst Mat Jean Rouxel, F-44322 Nantes 3, France. Univ Sofia, Fac Phys, BG-1164 Sofia, Bulgaria. ICMCB, F-33608 Pessac, France. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Ragot, F (reprint author), Inst Mat Jean Rouxel, 2 Rue Houssiniere, F-44322 Nantes 3, France. NR 4 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 773 EP 774 DI 10.1016/S0379-6779(00)00841-9 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500046 ER PT J AU Olejniczak, I Jones, BR Dong, J Pigos, JM Zhu, Z Garlach, AD Musfeldt, JL Koo, HJ Whangbo, MH Schlueter, JA Ward, BH Morales, E Kini, AM Winter, RW Mohtasham, J Gard, GL AF Olejniczak, I Jones, BR Dong, J Pigos, JM Zhu, Z Garlach, AD Musfeldt, JL Koo, HJ Whangbo, MH Schlueter, JA Ward, BH Morales, E Kini, AM Winter, RW Mohtasham, J Gard, GL TI Optical studies of the beta ''-(ET)(2)SF5RSO3 (R=CH2CF2, CHFCF2 and CHF) system: chemical tuning of the counterion SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE reflection spectroscopy; organic conductors based on radical cation and/or anion salts AB We compare the polarized optical spectra of the organic metal beta "-(ET)(2) SF5CHFSO3 and the beta "-(ET)(2)SF5CHFCF2SO3 metal/insulator material with those of the first fully organic superconductor beta "-(ET)(2)SF5CH2CF2SO3. The small chemical modification of the counterion has a dramatic effect on the spectral and charge transport properties of these materials, and we discuss their electronic structure in terms of band structure, many-body effects, and disorder. Based on structural differences in the anion pocket of the three salts, we conclude that the unusual electronic excitations observed in the beta "-(ET)(2)SF5CHFCF2SO3 metal/insulator material are caused by disorder-related localization. C1 Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland. SUNY Binghamton, Dept Chem, Binghamton, NY 13902 USA. N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Portland State Univ, Dept Chem, Portland, OR 97207 USA. RP Olejniczak, I (reprint author), Polish Acad Sci, Inst Mol Phys, Smoluchowskiego 17-19, PL-60179 Poznan, Poland. RI Zhu, Zhengtao/A-1633-2009; Kini, Aravinda/F-4467-2012 OI Zhu, Zhengtao/0000-0002-9311-2110; NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 785 EP 786 DI 10.1016/S0379-6779(00)00896-1 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500052 ER PT J AU Hagel, J Wanka, S Wosnitza, J Balthes, E Schlueter, JA Kini, AM Geiser, U Mohtasham, J Winter, RW Gard, GL AF Hagel, J Wanka, S Wosnitza, J Balthes, E Schlueter, JA Kini, AM Geiser, U Mohtasham, J Winter, RW Gard, GL TI Two-dimensional magnetic quantum oscillations observed in an organic metal SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE organic superconductors; magnetic measurements ID FERMI-SURFACE; CONDUCTORS AB The de Haas-van Alphen (dHvA) signal of the organic superconductor beta "-(BEDT-TTF)(2)SF5CH2CF2SO3 shows an inverse-sawtooth wave form which proves the existence of an ideal two-dimensional (2D) Fermi surface. The dHvA wave shape can almost perfectly be described by a 2D theory assuming a constant chemical potential. This either implies the existence of the predicted quasi-one-dimensional band with an exceptionally large density of states or the chemical potential may be pinned due to localized states near the Fermi energy. C1 Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany. MPI, Grenoble High Magnet Field Lab, F-38042 Grenoble, France. CNRS, F-38042 Grenoble, France. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. Portland State Univ, Dept Chem, Portland, OR 97207 USA. RP Wosnitza, J (reprint author), Univ Karlsruhe, Inst Phys, Engesserstr 7, D-76128 Karlsruhe, Germany. RI Kini, Aravinda/F-4467-2012 NR 10 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 813 EP 814 DI 10.1016/S0379-6779(00)01089-4 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500066 ER PT J AU Muller, J Lang, M Schlueter, JA Geiser, U Schweitzer, D AF Muller, J Lang, M Schlueter, JA Geiser, U Schweitzer, D TI Importance of interlayer effects for T-c in kappa-(ET)(2)X superconductors SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE thermal expansion; superconducting phase transition; organic superconductors; BEDT-TTF salt ID TRANSITION-TEMPERATURE; PRESSURE; DEPENDENCE AB We report high-resolution measurements of the linear thermal-expansion coefficient perpendicular to the conducting planes, alpha (perpendicular to)(T), on single crystals of the superconductors kappa-(ET)(2)X with X=I-3, Cu(NCS)(2) and Cu[N(CN)(2)]Br. For all three compounds we find pronounced negative phase-transition anomalies at T-c. Using the Ehrenfest relation, the uniaxial-pressure coefficients of T-c can be determined. We find that interlayer effects are of crucial importance for T-c in this class of materials. Regarding also intralayer effects we compare our results with recent theories addressing the p - T phase diagram. C1 Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Stuttgart, Inst Phys 3, D-7000 Stuttgart, Germany. RP Muller, J (reprint author), Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany. NR 8 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 855 EP 856 DI 10.1016/S0379-6779(00)00724-4 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500087 ER PT J AU Symington, JA Singleton, J Harrison, N Clayton, N Schlueter, J Kurmoo, M Day, P AF Symington, JA Singleton, J Harrison, N Clayton, N Schlueter, J Kurmoo, M Day, P TI Interplane transport effects in layered organic conductors SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE organic superconductor; transport measurements; magnetotransport; magnetic measurements ID ANGLE-DEPENDENT MAGNETORESISTANCE; MAGNETIC-FIELDS; METALS; OSCILLATIONS AB Detailed studies of the magnetic field orientation on magnetic quantum oscillations in two charge transfer salts of the molecule ET have been carried out. After all conventional mechanisms affecting quantum oscillations have been accounted for, we find that the amplitude of the oscillations has an underlying dependence exp(-alpha tan theta), where a is the angle between the normal to the highly-conducting layers and the magnetic field, and a is a constant. C1 Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 4AW, England. LANL Los Alamos, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Argonne Natl Lab, Argonne, IL 60439 USA. Royal Inst, London W1X 4BC, England. RP Symington, JA (reprint author), Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 4AW, England. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 867 EP 868 DI 10.1016/S0379-6779(00)01540-X PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500093 ER PT J AU McCormick, BJ Siemer, C Afroz, F Wasson, JR Eichhorn, DM Scott, B Shah, S Noffsinger, K Kahol, PK AF McCormick, BJ Siemer, C Afroz, F Wasson, JR Eichhorn, DM Scott, B Shah, S Noffsinger, K Kahol, PK TI The copper acetylenedicarboxylate system SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE cuprous iodide; copper acetylide; magnetic susceptibility; dc conductivity; electron spin resonance ID IODINE AB The reaction between Cu(II) and acetylenedicarboxylate at 5 degreesC produces large blue crystals, with a linear chain structure, having the composition [Cu((O)2CC drop CCO2)(H2O)(3)]. The compound decomposes thermally: providing a black phase consisting of carbon and copper. This phase, when doped with iodine, becomes conducting with a maximum conductivity of 0.9 S/cm. A study involving structure, magnetic susceptibility, ESR, and de conductivity shows that conduction in this material is most likely due to the formation of cuprous iodide. C1 Wichita State Univ, Dept Chem, Wichita, KS 67260 USA. Adv Mat Inc, New Hill, NC 27562 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Wichita State Univ, Dept Phys, Wichita, KS 67260 USA. RP McCormick, BJ (reprint author), Wichita State Univ, Dept Chem, Wichita, KS 67260 USA. RI Scott, Brian/D-8995-2017; OI Scott, Brian/0000-0003-0468-5396; Eichhorn, David/0000-0002-9780-4149 NR 7 TC 7 Z9 7 U1 2 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 969 EP 970 DI 10.1016/S0379-6779(00)00745-1 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500144 ER PT J AU Honold, MM Singleton, J Harrison, N Kartsovnik, MV Kushch, ND Kurmoo, M Day, P AF Honold, MM Singleton, J Harrison, N Kartsovnik, MV Kushch, ND Kurmoo, M Day, P TI Comprehensive delineation of the anomalous magnetotransport regime in alpha-(BEDT-TTF)(2)MHg(SCN)(4) (M = K, Tl) SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE quantum oscillations; BEDT-TTF salts; quantum Hall effect ID STATES AB We present pulsed-field magnetotransport measurements of alpha-(BEDT-TTF)(2)MHg(SCN)(4) (M = K, T1), covering fields B of up to 60 T and temperatures down to T = 500 mK. Interplane magnetoresistance and Hall-potential oscillations have been used to map the anomalous magnetotransport phenomena formerly attributed to the quantum Hall effect and chiral Fermi liquids. The effects occur in a region of B-T space suggestive of the formation of an exotic groundstate which depends on sample quality. C1 Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. Walther Meissner Inst Tieftemp Forsch, D-85748 Garching, Germany. Russian Acad Sci, Inst Chem Phys Res, Chernogolovka 142432, Russia. UCL Royal Inst Great Britain, London W1X 4BS, England. RP Singleton, J (reprint author), Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England. EM j.singleton1@physics.ox.ac.uk RI Kartsovnik, Mark/E-3598-2013 OI Kartsovnik, Mark/0000-0002-3011-0169 NR 7 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 1025 EP 1026 DI 10.1016/S0379-6779(00)01539-3 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500172 ER PT J AU Edwards, RS Symington, JA Rzepniewski, E Ardavan, A Singleton, J Schlueter, JA AF Edwards, RS Symington, JA Rzepniewski, E Ardavan, A Singleton, J Schlueter, JA TI Unconventional cyclotron resonance in the organic superconductor beta''-(ET)(2)SF2CH2CF2SO3 SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE organic superconductors; AC transport measurements; magnetic measurements AB We have measured angle-dependent magnetoresistance oscillations and the interplane millimetre-wave conductivity of the organic superconductor beta "-(ET)(2)SF5CH2CF2SO3 as a function of the orientation of the applied magnetic field. We observe harmonics of the cyclotron frequency in the real-space velocity of quasiparticles orbiting the Fermi surface (FS). The harmonic amplitudes depend on the field orientation, providing a new way to measure the quasi-two-dimensional FS topology. C1 Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. Argonne Natl Lab, Argonne, IL 60439 USA. RP Edwards, RS (reprint author), Univ Oxford, Dept Phys, Clarendon Lab, Pk Rd, Oxford OX1 3PU, England. OI Edwards, Rachel/0000-0003-2550-3627 NR 7 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 120 IS 1-3 SI SI BP 1033 EP 1034 DI 10.1016/S0379-6779(00)01109-7 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 435NL UT WOS:000168887500176 ER PT J AU List, EJW Kim, CH Graupner, W Leising, G Shinar, J AF List, EJW Kim, CH Graupner, W Leising, G Shinar, J TI Nonradiative quenching of singlet excitons by polarons in pi-conjugated polymers SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) CY JUL 15-21, 2000 CL GASTEIN, AUSTRIA DE photoluminescence detected magnetic resonance; photoluminescence; singlet excitons; PL-quenching ID LADDER-TYPE POLY(PARA-PHENYLENE); CHARGED EXCITATIONS; OPTICAL-PROPERTIES; POLY(P-PHENYLENEVINYLENE); PHOTOGENERATION; OLIGOMERS; DEFECTS; FILMS AB The photoluminescence (PL)-detected magnetic resonance (PLDMR) of various pi -conjugated materials, including poly(p-phenylene vinylenes) (PPVs), isolated PPV chains in a nano-structured liquid crystal host, methyl-substituted ladder-type poly(p-phenylene), and oligophenylenes are described. All of the results are in excellent quantitative agreement with a rate-equation model in which the positive (PL-enhancing) spin 1/2 PLDMR is due to the role of polarons in nonradiative quenching of singlet excitons. The results also suggest that this quenching process is very significant in luminescent pi -conjugated materials and organic light-emitting devices, and should be taken into account, especially at high excitation densities such as in lasing action. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA. Graz Tech Univ, Inst Festkorperphys, A-8010 Graz, Austria. Emagin Corp, Hopewell Junction, NY 12533 USA. Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA. RP List, EJW (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. RI List-Kratochvil, Emil/M-5312-2013 NR 21 TC 5 Z9 5 U1 0 U2 4 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 15 PY 2001 VL 119 IS 1-3 SI SI BP 511 EP 514 DI 10.1016/S0379-6779(00)01463-6 PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 433EC UT WOS:000168741500233 ER PT J AU Shen, TD Schwarz, RB AF Shen, TD Schwarz, RB TI Bulk ferromagnetic glasses in the Fe-Ni-P-B system SO ACTA MATERIALIA LA English DT Article DE rapid solidification; differential thermal analysis (DTA); metallic glasses; phase transformations ID METALLIC GLASSES; CRYSTALLIZATION KINETICS; MAGNETIC-PROPERTIES; AMORPHOUS-ALLOYS; SOFT AB The ferromagnetic metallic glass Fe40Ni40P14B6. available only as 30-50 mum thick ribbons, has been extensively studied over the last three decades. We used a flux-melting and water-quenching technique to prepare bulk glassy Fe40Ni40P14B6 alloys in the form of 2-mm diameter spheres and 1-mm diameter rods. The Curie temperature for the bulk glasses is higher than the average value of Curie temperatures reported for the rapidly quenched ribbons. The glass-transition temperature and the crystallization temperature of the bulk glasses are lower and higher, respectively. than the average values reported for rapidly quenched ribbons, making the supercooled-liquid region as wide as 42 K. The bulk glasses crystallize by a homogeneous nucleation followed by a growth at a constant rate. The nucleation rate in the bulk glasses is four orders of magnitude lower than in the rapidly quenched ribbons, suggesting that the previous thickness limitation was due to impurities in the melt (heterogeneous nucleation). Published by Elsevier Science Ltd. on behalf of Acta Materialia Inc. C1 Univ Calif Los Alamos Natl Lab, Struct Property Relationship Grp, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Schwarz, RB (reprint author), Univ Calif Los Alamos Natl Lab, Struct Property Relationship Grp, Div Mat Sci & Technol, MST-8,Mail Stop G755, Los Alamos, NM 87545 USA. NR 47 TC 103 Z9 121 U1 8 U2 35 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6454 J9 ACTA MATER JI Acta Mater. PD MAR 14 PY 2001 VL 49 IS 5 BP 837 EP 847 DI 10.1016/S1359-6454(00)00365-7 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 412UC UT WOS:000167571900011 ER PT J AU Snee, PT Payne, CK Kotz, KT Yang, H Harris, CB AF Snee, PT Payne, CK Kotz, KT Yang, H Harris, CB TI Triplet organometallic reactivity under ambient conditions: An ultrafast UV pump/IR probe study SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID HYDROGEN BOND ACTIVATION; TRANSITION-METAL ATOMS; MOLECULAR-ORBITAL METHODS; EFFECTIVE CORE POTENTIALS; DENSITY-FUNCTIONAL THEORY; C-H BOND; GAS-PHASE; IRON PENTACARBONYL; OXIDATIVE ADDITION; INFRARED-SPECTROSCOPY AB : The reactivity of triplet 16-electron organometallic species has been studied in room-temperature solution using femtosecond UV pump IR probe spectroscopy. Specifically, the Si-H bond-activation reaction of photogenerated triplet Fe(CO)(4) and triplet CpCo(CO) with triethylsilane has been characterized and compared to the known singlet species CpRh(CO). The intermediates observed were studied using density functional theory (DFT) as well as ab initio quantum chemical calculations. The triplet organometallics have a greater overall reactivity than singlet species due to a change in the Si-H activation mechanism, which is due to the fact that triplet intermediates coordinate weakly at best with the ethyl groups of triethylsilane. Consequently, the triplet species do not become trapped in alkyl-solvated intermediate states. The experimental results are compared to the theoretical calculations, which qualitatively reproduce the trends in the data. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Ernest Orlando Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Harris, CB (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Payne, Christine/E-5954-2010 NR 66 TC 62 Z9 62 U1 1 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 14 PY 2001 VL 123 IS 10 BP 2255 EP 2264 DI 10.1021/ja002350r PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA 413VC UT WOS:000167631400018 PM 11456872 ER PT J AU Kim, CY Park, MS Dyer, RB AF Kim, CY Park, MS Dyer, RB TI Human flap endonuclease-1: Conformational change upon binding to the flap DNA substrate and location of the Mg2+ binding site SO BIOCHEMISTRY LA English DT Article ID TRANSFORM INFRARED-SPECTROSCOPY; PROTEIN SECONDARY STRUCTURE; EXCISION-REPAIR PATHWAY; N-TERMINAL FRAGMENT; CRYSTAL-STRUCTURE; IN-VITRO; REPLICATION; FEN-1; CLEAVAGE; EXONUCLEASE AB Human flap endonuclease-1 (FEN-1) is a member of the structure-specific endonuclease family and is a key enzyme in DNA replication and repair. FEN-1 recognizes the 5'-flap DNA structure and cleaves it, a specialized endonuclease function essential for the processing of Okazaki fragments during DNA replication and for the repair of 5'-end single-stranded tails from nicked double-stranded DNA substrates. Magnesium is a cofactor required for nuclease activity. We have used Fourier transform infrared (FTIR) spectroscopy to better understand how Mg2+ and flap DNA interact with human FEN-1. FTIR spectroscopy provides three fundamentally new insights into the structural changes induced by the interaction of FEN-1 with substrate DNA and Mg2+. First, FTIR difference spectra in the amide I vibrational band (1600-1700 cm(-1)) reveal a change in the secondary structure of FEN-1 induced by substrate DNA binding. Quantitative analysis of the FTIR spectra indicates a 4% increase in helicity upon DNA binding or about 14 residues converted from disordered to helical conformations. The observation that the residues are disordered without DNA strongly implicates the flexible loop region. The conversion to helix also suggests a mechanism for locking the flexible loop region around the bound DNA. This is the first direct experimental evidence for a binding mechanism that involves a secondary structural change of the protein. Second, in contrast with DNA binding, no change is observed in the secondary structure of FEN-1 upon Mg2+ binding to the wild type or to the noncleaving D181A mutant, Third, the FTIR results provide direct evidence (via the carboxylate ligand band at 1535 cm(-1)) that not only is D181 a ligand to Mg2+ in the human enzyme but Mg2+ binding does not occur in the D181A mutant which lacks this ligand. C1 Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. RP Park, MS (reprint author), Los Alamos Natl Lab, Biosci Div, POB 1663, Los Alamos, NM 87545 USA. OI Kim, Chang-Yub/0000-0001-9353-5909 NR 50 TC 21 Z9 22 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAR 13 PY 2001 VL 40 IS 10 BP 3208 EP 3214 DI 10.1021/bi002100n PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 409VU UT WOS:000167407000024 PM 11258937 ER PT J AU Dubon, OD Evans, PG Chervinsky, JF Aziz, MJ Spaepen, F Golovchenko, JA Chisholm, MF Muller, DA AF Dubon, OD Evans, PG Chervinsky, JF Aziz, MJ Spaepen, F Golovchenko, JA Chisholm, MF Muller, DA TI Doping by metal-mediated epitaxy: Growth of As delta-doped Si through a Pb monolayer SO APPLIED PHYSICS LETTERS LA English DT Article ID TEMPERATURE HOMOEPITAXIAL GROWTH; MOLECULAR-BEAM EPITAXY; SCANNING-TUNNELING-MICROSCOPY; SI(111) HOMOEPITAXY; SILICON; GAAS; SURFACTANTS; IMPURITIES; OVERLAYERS; KINETICS AB In molecular-beam epitaxy a monolayer of Pb on the Si(111) surface induces single-crystal growth at temperatures well below those required for similar growth on a bare surface. We demonstrate that the suppression of dopant segregation at the lower temperatures attainable by Pb-mediated growth allows the incorporation of As donors at concentrations reaching a few atomic percent. When Pb and Si are deposited on an As-terminated Si(111) substrate at 350 degreesC, the Pb segregates to the surface without doping the Si film while the As is buried within nanometers of the substrate-film interface. The resulting concentration of electrically active As, 1.8 x 10(21) cm(-3), represents the highest concentration of As donors achieved by any delta-doping or thin-film deposition method. (C) 2001 American Institute of Physics. C1 Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. RP Dubon, OD (reprint author), Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. RI Evans, Paul/A-9260-2009; Muller, David/A-7745-2010 OI Evans, Paul/0000-0003-0421-6792; Muller, David/0000-0003-4129-0473 NR 33 TC 8 Z9 8 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 12 PY 2001 VL 78 IS 11 BP 1505 EP 1507 DI 10.1063/1.1352692 PG 3 WC Physics, Applied SC Physics GA 409BM UT WOS:000167364700015 ER PT J AU Wang, LW AF Wang, LW TI Large-scale local-density-approximation band gap-corrected GaAsN calculations SO APPLIED PHYSICS LETTERS LA English DT Article ID NITROGEN IMPURITY; ALLOYS; SEMICONDUCTORS; GAAS1-XNX; PRESSURE AB The electronic structure of a GaAsN alloy is calculated using a 4096 atom supercell, with a 70 Ry plane wave basis cutoff and Ga atom 3d electrons as valence electrons. The charge density of this supercell is generated by patching the charge density of a small unit cell with the charge density of bulk GaAs. The local-density-approximation band gap error is corrected by modifying the nonlocal pseudopotentials. A localized nitrogen state [a(1)(N)] is obtained,and it plays an important role in the band gap reduction of GaAsN. (C) 2001 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, NERSC, Berkeley, CA 94720 USA. RP Wang, LW (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, NERSC, Berkeley, CA 94720 USA. EM lwwang@lbl.gov NR 18 TC 64 Z9 67 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 12 PY 2001 VL 78 IS 11 BP 1565 EP 1567 DI 10.1063/1.1354162 PG 3 WC Physics, Applied SC Physics GA 409BM UT WOS:000167364700035 ER PT J AU Mehta, A Cherian, S Hedden, D Thundat, T AF Mehta, A Cherian, S Hedden, D Thundat, T TI Manipulation and controlled amplification of Brownian motion of microcantilever sensors SO APPLIED PHYSICS LETTERS LA English DT Article ID DYNAMIC FORCE MICROSCOPY; CANTILEVERS; FREQUENCY; NOISE AB Microcantilevers, such as those used in atomic force microscopy, undergo Brownian motion due to mechanical thermal noise. The root mean square amplitude of the Brownian motion of a cantilever typically ranges from 0.01-0.1 nm, which limits its use in practical applications. Here we describe a technique by which the Brownian amplitude and the Q factor in air and water can be amplified by three and two orders of magnitude, respectively. This technique is similar to a positive feedback oscillator, wherein the Brownian motion of the vibrating cantilever controls the frequency output of the oscillator. This technique can be exploited to improve sensitivity of microcantilever-based chemical and biological sensors, especially for sensors in liquid environments. (C) 2001 American Institute of Physics. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Thundat, T (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 11 TC 60 Z9 61 U1 2 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 12 PY 2001 VL 78 IS 11 BP 1637 EP 1639 DI 10.1063/1.1355001 PG 3 WC Physics, Applied SC Physics GA 409BM UT WOS:000167364700059 ER PT J AU Leon-Escamilla, EA Corbett, JD AF Leon-Escamilla, EA Corbett, JD TI Hydrogen impurity effects. A(5)Tt(3)Z intermetallic compounds between A = Ca, Sr, Ba, Eu, Yb and Tt = Sn, Pb with Cr5B3-like structures that are stabilized by hydride or fluoride (Z) SO INORGANIC CHEMISTRY LA English DT Article ID ZINTL-PHASES; EARTH-METALS; ALKALINE-EARTH; SOLID-STATE; TIN; SYSTEM AB The binary systems Ca-Sn, Ba-Sn, Eu-Sn, Yb-Sn, Sr-Pb, Ba-Pb, and Eu-Pb do not contain Cr5B3-like A(5)Tt(3) phases when care is taken to exclude hydrogen from the reactions (Tt = tetrel, Si-Pb). All form ternary A(5)Tt(3)H(x) phases (x less than or equal to 1) with "stuffed'' Cr5B3-like structures instead, and all of those tested, Ca-Sn, Ba-Sn, Sr-Pb, and Ba-Pb, also yield the isostructural A(5)Tt(3)F. The structures and compositions of Ca5Sn3Hx, Ca(5)Sn(3)Fo(0.89), Eu5Sn3Hx, and Sr5Pb3F have been refined from single-crystal X-ray diffraction data and of Ca5Sn3D from powder neutron data. The interstitial H, F atoms are bound in a tetrahedral (A(2+))(4) cavity in a Cr5B3-type metal atom structure. Nine previous reports of binary "Ba5Sn3", "Yb5Sn3", "Sr5Pb3", and "Ba5Pb3" compounds were wrong and presumably concerned the hydrides. The new ternary phases are generally Pauli-paramagnetic, evidently with pi* electrons from the characteristic tetrelide dimers in this structure type at least partially delocalized into the conduction band. The Sn-Sn bonds appear correspondingly shortened on oxidation. Other new phases reported are CaSn (CrB type), YbsSn(4)H(x) (Sm5Ge4), YbSn (similar to TlTe), Ba5Pb3 (similar toW(5)Si(3)), and Yb31Pb20 (Ca31Sn20). C1 Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Ames Lab, DOE, Ames, IA 50011 USA. RP Corbett, JD (reprint author), Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. NR 45 TC 28 Z9 28 U1 0 U2 8 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 MAR 12 PY 2001 VL 40 IS 6 BP 1226 EP 1233 DI 10.1021/ic0010306 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 409PT UT WOS:000167392600022 PM 11300823 ER PT J AU Wang, WD Espenson, JH AF Wang, WD Espenson, JH TI Kinetics and mechanism of phosphine autoxidation catalyzed by imidorhenium(V) complexes SO INORGANIC CHEMISTRY LA English DT Article ID MOLECULAR-OXYGEN; TERTIARY PHOSPHINES; PHOSPHORUS LIGANDS; CRYSTAL-STRUCTURE; OXIDATION AB The relative binding abilities of PY3 (PMe3, PMe2Ph, PMePh2, PPh3, P(OMe)(3), P(OMe)(2)Ph, PEt3, P(OEt)(3), P(OEt)Ph, and dmpe) toward Re-V were evaluated. The equilibrium constants for the reactions, MeRe(NAr)(2){P(OMe)(3)}(2) + PY3 = MeRe(NAr)(2)(PY3)(2) (1) + P(OMe)(3), decrease in the order PMe3 > dmpe > PMe2Ph > P(OMe)(2)Ph similar to PEt3 > P(OEt)(3) > PMePh2 > P(OEt)Ph-2 > PPh3. Both electronic and steric factors contribute to this trend. The equilibrium constant increases as the basicity of PY3 increases when the steric demand is the same. However, steric effects play a major role in the coordination, and this is the reason that the affinity of PEt3 toward Re-V is less than that of PMe2Ph, A mixed-ligand complex, MeRe(NAr)(2){P(OMe)(3)}(PY3), was also observed in the course of the stepwise formation of 1. The large coupling constant, (2)J(PP) greater than or equal to 491 Hz, between the two phosphorus atoms suggests a trans geometry for the phosphines. Compound 1 catalyzes the oxidation of PY3 by molecular oxygen. Kinetic studies suggest that the reaction of 1 with O-2 is first-order with respect to [O-2] and inverse-first-order with respect to [PY3]. A mechanism involving a peroxorhenium intermediate MeRe(NAr)(2)(eta (2)-O-2) is proposed for the catalytic processes. The reactivity of MeRe(NAr)(2)(eta (2)-O-2) toward triaryl phosphines parallels that of the known compound MeReO2(eta (2)-O-2). C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. RP Espenson, JH (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. NR 35 TC 3 Z9 3 U1 0 U2 4 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 MAR 12 PY 2001 VL 40 IS 6 BP 1323 EP 1328 DI 10.1021/ic000940k PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 409PT UT WOS:000167392600035 PM 11300836 ER PT J AU Schrama, JM Singleton, J Edwards, RS Ardavan, A Rzepniewski, E Harris, R Goy, P Gross, M Schlueter, J Kurmoo, M Days, P AF Schrama, JM Singleton, J Edwards, RS Ardavan, A Rzepniewski, E Harris, R Goy, P Gross, M Schlueter, J Kurmoo, M Days, P TI Millimetre-wave measurements of the bulk magnetoconductivity of anisotropic metals: application to the organic superconductors kappa-(BEDT-TTF)(2)Cu(NCS)(2) and beta ''-(BEDT-TTF)(2)SF5CH2CF2SO3 (BEDT-TTF bis(ethylene-dithio)tetrathiafulvalene) SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ANGLE-DEPENDENT MAGNETORESISTANCE; HIGH MAGNETIC-FIELDS; CYCLOTRON-RESONANCE; FERMI-SURFACE; QUANTUM INTERFERENCE; AMBIENT-PRESSURE; EFFECTIVE-MASS; CONDUCTORS; BREAKDOWN; KAPPA-(BEDT-TTF)2CU(NCS)2 AB We describe a novel resonant cavity system which allows the bulk magnetoconductivity of single crystals of anisotropic metals to be measured at GHz frequencies. The cavity can be made to rotate in a static magnetic field, permitting detailed studies of the dependence on the magnetic field orientation of the high-frequency magnetoconductivity. In this paper, the apparatus is used to measure the Fermi-surface topology of two organic superconductors; the details revealed are inaccessible to conventional fermiological techniques such as the de Haas-van Alphen effect. In kappa-(BEDT-TTF)(2)Cu(NCS)(2), Fermi-surface traversal resonances (FTRs) are observed, The angle dependence of the FTRs shows that the quasi-one-dimensional (Q1D) Fermi sheets of this material possess two distinct corrugations, with corrugation axes making angles of 17.3 degrees and -19.4 degrees with the k(a)-axis. Such data form important input parameters for current models of superconductivity in the organics, which invoke spin-density-wave-like fluctuations caused by partial nesting of the Q1D Fermi sheets. In beta "-(BEDT-TTF)(2)SF5CH2CF2SO3, cyclotron resonance is observed, along with its second and third harmonics. The detailed angle dependence of the intensities of the various cyclotron harmonics allows the elongation and orientation of the closed section of the Fermi surface to be deduced, and strongly suggests that the interplane transport is coherent in this material. The effective mass deduced from the cyclotron resonance measurements is greater than that determined from magnetic quantum oscillations, in agreement with recent theoretical predictions. C1 Univ Oxford, Clarendon Lab, Dept Phys, Oxford OX1 3PU, England. Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. AB Millimetre, F-75005 Paris, France. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat, Argonne, IL 60439 USA. Royal Inst London, London, England. RP Singleton, J (reprint author), Univ Oxford, Clarendon Lab, Dept Phys, Parks Rd, Oxford OX1 3PU, England. NR 84 TC 35 Z9 35 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 MAR 12 PY 2001 VL 13 IS 10 BP 2235 EP 2261 DI 10.1088/0953-8984/13/10/317 PG 27 WC Physics, Condensed Matter SC Physics GA 413YR UT WOS:000167639600018 ER PT J AU Burkert, VD AF Burkert, VD CA CLAS collaboration TI Probing the structure of nucleons in the resonance region with CLAS at Jefferson Lab SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID HIGH MOMENTUM-TRANSFER; DELTA(1232) RESONANCE; ELECTROPRODUCTION; BARYONS; MODEL C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA USA. RP Burkert, VD (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA USA. NR 36 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 16C EP 25C PG 10 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700003 ER PT J AU Peng, JC AF Peng, JC TI Flavor asymmetry of the nucleon sea SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID LIGHT-QUARK SEA; DRELL-YAN PROCESS; N-C LIMIT; DEEP-INELASTIC SCATTERING; PARTON DISTRIBUTIONS; SYMMETRY-BREAKING; CHIRAL-SYMMETRY; ANTIQUARK DISTRIBUTIONS; ELASTIC-SCATTERING; FORM-FACTORS C1 Univ Calif Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. RP Peng, JC (reprint author), Univ Calif Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. NR 65 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 80C EP 88C PG 9 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700009 ER PT J AU Holt, RJ AF Holt, RJ TI Illuminating the deuteron at Jefferson Laboratory SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID ELECTROMAGNETIC FORM-FACTORS; ELASTIC ELECTRON-SCATTERING; LIGHT-FRONT DYNAMICS; 2-BODY PHOTODISINTEGRATION; TENSOR POLARIZATION; MOMENTUM-TRANSFER; PHOTON ENERGIES; MODEL; PREDICTIONS; AMPLITUDES C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. RP Holt, RJ (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RI Holt, Roy/E-5803-2011 NR 53 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 148C EP 156C PG 9 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700016 ER PT J AU Schiavilla, R AF Schiavilla, R TI Electro-weak capture reactions for astrophysics SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID NEUTRINO ENERGY-SPECTRUM; MONTE-CARLO CALCULATIONS; FEW-BODY NUCLEI; RADIATIVE-CAPTURE; SCATTERING; FREEDOM; STATE C1 Jefferson Lab, Newport News, VA 23606 USA. Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA. RP Jefferson Lab, Newport News, VA 23606 USA. NR 25 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 157C EP 166C PG 10 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700017 ER PT J AU Friar, JL AF Friar, JL TI Three-nucleon forces for the new millennium SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID CHIRAL LAGRANGIANS; 3-NUCLEON FORCES; 2-PION EXCHANGE; SYSTEMS; 3-BODY C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Friar, JL (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 25 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 200C EP 208C PG 9 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700022 ER PT J AU Varga, K AF Varga, K TI Review of the recent applications of the stochastic variational method SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID STRONG MAGNETIC-FIELDS; GROUND-STATE; ENERGIES; HELIUM; STABILITY; SYSTEMS C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Hungarian Acad Sci, ATOMKI, Inst Nucl Res, H-4000 Debrecen, Hungary. RP Varga, K (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RI Varga, Kalman/A-7102-2013 NR 29 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 209C EP 217C PG 9 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700023 ER PT J AU Wagenbrunn, RF Glozman, LY Plessas, W Varga, K AF Wagenbrunn, RF Glozman, LY Plessas, W Varga, K TI Extended Goldstone-boson-exchange chiral quark model SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID CONSTITUENT C1 Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy. Graz Univ, Inst Theoret Phys, A-8010 Graz, Austria. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary. RP Wagenbrunn, RF (reprint author), Univ Pavia, Dipartimento Fis Nucl & Teor, Via Bassi 6, I-27100 Pavia, Italy. RI Varga, Kalman/A-7102-2013 NR 9 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 284C EP 286C PG 3 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700031 ER PT J AU Lee, TSH Sato, T AF Lee, TSH Sato, T TI Dynamical study of Delta excitation with N(e, e 'pi) reaction SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV C1 Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Lee, TSH (reprint author), Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. 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 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 327C EP 329C PG 3 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700044 ER PT J AU Jackson, HE AF Jackson, HE CA NucPi Collaboration TI Charged pion electroproduction on H,H-2, and He-3 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID NUCLEAR C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Jackson, HE (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 449C EP 453C PG 5 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700079 ER PT J AU Kozlov, A Aniol, KA Bartsch, P Baumann, D Bertozzi, W Bohm, R Bohinc, K Chen, JP Dale, D Dennis, L Derber, S Ding, M Distler, MO Dragovitsch, P Ewald, I Fissum, KG Florizone, REJ Friedrich, J Friedrich, JM Geiges, R Gilad, S Jennewein, P Kahrau, M Kohl, M Krygier, KW Liesenfeld, A Margaziotis, DJ Merkel, H Merle, P Muller, U Neuhausen, R Pospischil, T Riccardi, G Roche, R Rosner, G Rowntree, D Sarty, AJ Schmieden, H Sirca, S Templon, JA Thompson, MN Wagner, A Walcher, T Weis, M Zhao, J Zhou, Z AF Kozlov, A Aniol, KA Bartsch, P Baumann, D Bertozzi, W Bohm, R Bohinc, K Chen, JP Dale, D Dennis, L Derber, S Ding, M Distler, MO Dragovitsch, P Ewald, I Fissum, KG Florizone, REJ Friedrich, J Friedrich, JM Geiges, R Gilad, S Jennewein, P Kahrau, M Kohl, M Krygier, KW Liesenfeld, A Margaziotis, DJ Merkel, H Merle, P Muller, U Neuhausen, R Pospischil, T Riccardi, G Roche, R Rosner, G Rowntree, D Sarty, AJ Schmieden, H Sirca, S Templon, JA Thompson, MN Wagner, A Walcher, T Weis, M Zhao, J Zhou, Z TI The longitudinal and transverse response of the He-4(e, e ' p) reaction in the dip region SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID NUCLEI C1 Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia. Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA. Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. Univ Ljubljana, Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia. TJNAF, Newport News, VA 23606 USA. Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA. Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. Florida State Univ, Supercomp Res Inst, Tallahassee, FL 32306 USA. Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany. Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA. RP Kozlov, A (reprint author), Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia. RI riccardi, gabriele/A-9269-2012; Friedrich, Jan/B-9024-2013; Merkel, Harald/B-9705-2013; Sarty, Adam/G-2948-2014 OI Friedrich, Jan/0000-0001-9298-7882; NR 10 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 460C EP 463C PG 4 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700082 ER PT J AU Reinhold, J Abbott, D Ahmidouch, A Ambrozewicz, P Armstrong, CS Arrington, J Asaturyan, R Assamagan, K Avery, S Bailey, K Baker, OK Beedoe, S Bitao, H Boeglin, N Breuer, H Brown, DS Carlini, R Cha, J Chant, N Christy, E Cochran, A Cole, L Collins, G Cothran, C Crowder, J Cummings, WJ Danagoulian, S Dohrmann, F Duncan, F Dunne, J Dutta, D Eden, T Elaasar, M Ent, R Ewell, L Fenker, H Fortune, HT Fujii, Y Gan, L Gao, H Garrow, K Geesaman, DF Gueye, P Gustafsson, K Hafidi, K Hansen, JO Hinton, W Jackson, HE Juengst, H Keppel, C Klein, A Koltenuk, D Liang, Y Liu, JH Lung, A Mack, D Madey, R Markowitz, P Martoff, CJ Meekins, D Mitchell, J Miyoshi, T Mkrtchyan, H Mohring, R Mtingwa, SK Mueller, B O'Neill, TG Niculescu, G Niculescu, I Potterveld, D Price, JW Raue, BA Reimer, PE Roche, J Roos, P Sarsour, M Sato, Y Savage, G Sawafta, R Schiffer, JP Segel, RE Semenov, A Stepanyan, S Tadevosian, V Tajima, S Tang, L Terburg, B Uzzle, A Wood, S Yamaguchi, H Yan, C Yan, C Yuan, L Zeidman, B Zeier, M Zihlmann, B AF Reinhold, J Abbott, D Ahmidouch, A Ambrozewicz, P Armstrong, CS Arrington, J Asaturyan, R Assamagan, K Avery, S Bailey, K Baker, OK Beedoe, S Bitao, H Boeglin, N Breuer, H Brown, DS Carlini, R Cha, J Chant, N Christy, E Cochran, A Cole, L Collins, G Cothran, C Crowder, J Cummings, WJ Danagoulian, S Dohrmann, F Duncan, F Dunne, J Dutta, D Eden, T Elaasar, M Ent, R Ewell, L Fenker, H Fortune, HT Fujii, Y Gan, L Gao, H Garrow, K Geesaman, DF Gueye, P Gustafsson, K Hafidi, K Hansen, JO Hinton, W Jackson, HE Juengst, H Keppel, C Klein, A Koltenuk, D Liang, Y Liu, JH Lung, A Mack, D Madey, R Markowitz, P Martoff, CJ Meekins, D Mitchell, J Miyoshi, T Mkrtchyan, H Mohring, R Mtingwa, SK Mueller, B O'Neill, TG Niculescu, G Niculescu, I Potterveld, D Price, JW Raue, BA Reimer, PE Roche, J Roos, P Sarsour, M Sato, Y Savage, G Sawafta, R Schiffer, JP Segel, RE Semenov, A Stepanyan, S Tadevosian, V Tajima, S Tang, L Terburg, B Uzzle, A Wood, S Yamaguchi, H Yan, C Yan, C Yuan, L Zeidman, B Zeier, M Zihlmann, B TI Electroproduction of kaons and light hypernuclei SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV C1 Florida Int Univ, Miami, FL 33199 USA. Argonne Natl Lab, Argonne, IL 60439 USA. N Carolina Agr & Technol State Univ, Greensboro, NC 27411 USA. Kent State Univ, Kent, OH 44242 USA. Hampton Univ, Hampton, VA 23668 USA. Temple Univ, Philadelphia, PA 19122 USA. Coll William & Mary, Williamsburg, VA 23187 USA. CALTECH, Pasadena, CA 91125 USA. Yerevan Phys Inst, Yerevan 375036, Armenia. Univ Maryland, College Pk, MD 20742 USA. Univ Virginia, Charlottesville, VA 22903 USA. Juniata Coll, Huntingdon, PA 16652 USA. Forschungszentrum Rossendorf EV, Dresden, Germany. Northwestern Univ, Evanston, IL 60208 USA. So Univ New Orleans, New Orleans, LA USA. Univ Penn, Philadelphia, PA 19104 USA. Tohoku Univ, Sendai, Miyagi 980, Japan. Univ Minnesota, Minneapolis, MN 55455 USA. Old Dominion Univ, Norfolk, VA 23529 USA. American Univ, Washington, DC 20016 USA. Ohio Univ, Athens, OH 45701 USA. George Washington Univ, Washington, DC 20052 USA. Rensselaer Polytech Inst, Troy, NY 12181 USA. Univ Houston, Houston, TX 77004 USA. Duke Univ, Durham, NC 27706 USA. Univ Illinois, Chicago, IL 60680 USA. RP Reinhold, J (reprint author), Florida Int Univ, Miami, FL 33199 USA. RI Arrington, John/D-1116-2012; Reimer, Paul/E-2223-2013; Fujii, Yu/D-3413-2015 OI Arrington, John/0000-0002-0702-1328; Fujii, Yu/0000-0001-6625-2241 NR 8 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 470C EP 474C PG 5 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700085 ER PT J AU Nikolenko, DM Arenhovel, H Barkov, LM Belostotsky, SL Dmitriev, VF Dyug, MV Gilman, R Holt, RJ Isaeva de Jager, CW Kinney, ER Kowalczyk, RS Lazarenko, BA Loginov, AY Mishnev, SI Nelyubin, VV Osipov, AV Potterveld, DH Rachek, IA Shestakov, YV Sidorov, AA Stibunov, VN Toporkov, DK Vesnovsky, DK Vikhrov, VV de Vries, H Zevakov, SA AF Nikolenko, DM Arenhovel, H Barkov, LM Belostotsky, SL Dmitriev, VF Dyug, MV Gilman, R Holt, RJ Isaeva de Jager, CW Kinney, ER Kowalczyk, RS Lazarenko, BA Loginov, AY Mishnev, SI Nelyubin, VV Osipov, AV Potterveld, DH Rachek, IA Shestakov, YV Sidorov, AA Stibunov, VN Toporkov, DK Vesnovsky, DK Vikhrov, VV de Vries, H Zevakov, SA TI Measurement of polarization observables in elastic and inelastic electron-deuteron scattering at the VEPP-3 storage ring. SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV C1 Budker Inst Nucl Phys, Novosibirsk 630090, Russia. PINP, St Petersburg 188350, Russia. JGU, IKP, D-55099 Mainz, Germany. Rutgers State Univ, Piscataway, NJ 08855 USA. Univ Illinois, Champaign, IL 61820 USA. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Univ Colorado, Boulder, CO 80309 USA. Argonne Natl Lab, Argonne, IL 60439 USA. TPU, INP, Tomsk 634050, Russia. RP Nikolenko, DM (reprint author), Budker Inst Nucl Phys, Novosibirsk 630090, Russia. RI Holt, Roy/E-5803-2011; Dmitriev, Vladimir/G-3213-2013 NR 2 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 525C EP 527C PG 3 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700101 ER PT J AU Tanida, K Tamura, H Abe, D Ajimura, S Akikawa, P Araki, K Bhang, HC Chrien, RE Eugenio, P Frankling, GB Fujii, Y Fukuda, T Gan, L Hashimoto, O Hotchi, H Imai, K Kakiguchi, Y Khaustov, P Kim, JH Kim, YD Kohri, H May, M Miyoshi, T Murakami, T Nagae, T Nakano, J Noumi, H Ozawa, K Outa, H Pile, PH Quinn, BP Rusek, A Saito, T Sasao, J Sato, Y Satoh, S Sawafta, RI Schumacher, RA Sekimoto, M Takahashi, T Tamagawa, T Tang, L Xia, HH Yuan, L Zhou, SH Zhou, LH Zhu, XF AF Tanida, K Tamura, H Abe, D Ajimura, S Akikawa, P Araki, K Bhang, HC Chrien, RE Eugenio, P Frankling, GB Fujii, Y Fukuda, T Gan, L Hashimoto, O Hotchi, H Imai, K Kakiguchi, Y Khaustov, P Kim, JH Kim, YD Kohri, H May, M Miyoshi, T Murakami, T Nagae, T Nakano, J Noumi, H Ozawa, K Outa, H Pile, PH Quinn, BP Rusek, A Saito, T Sasao, J Sato, Y Satoh, S Sawafta, RI Schumacher, RA Sekimoto, M Takahashi, T Tamagawa, T Tang, L Xia, HH Yuan, L Zhou, SH Zhou, LH Zhu, XF CA KEKPS E419 BNLAGS E930 collab TI High-resolution gamma-ray spectroscopy of hypernuclei with germanium detectors SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV ID SPIN C1 Univ Tokyo, Dept Phys, Tokyo 1130033, Japan. Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan. CIAE, Dept Nucl Phys, Beijing 102413, Peoples R China. N Carolina Agr & Technol State Univ, Dept Phys, Greensboro, NC 27411 USA. Tohoku Univ, Nucl Sci Lab, Sendai, Miyagi 9800826, Japan. Sejong Univ, Dept Phys, Seoul 143747, South Korea. Hampton Univ, Dept Phys, Hampton, VA 23668 USA. KEK, Inst Nucl & Particle Phys, Tsukuba, Ibaraki 3050801, Japan. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea. Kyoto Univ, Dept Phys, Kyoto 6068502, Japan. Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. RP Tanida, K (reprint author), Univ Tokyo, Dept Phys, Tokyo 1130033, Japan. RI Zhu, Xiaofeng/B-9493-2011; Schumacher, Reinhard/K-6455-2013; Fujii, Yu/D-3413-2015 OI Schumacher, Reinhard/0000-0002-3860-1827; Fujii, Yu/0000-0001-6625-2241 NR 6 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 560C EP 562C PG 3 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700110 ER PT J AU Ohnishi, A Hirata, Y Nara, Y Shinmura, S Akaishi, Y AF Ohnishi, A Hirata, Y Nara, Y Shinmura, S Akaishi, Y TI Hyperon distribution and correlation in (K-, K+) reactions SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 16th International IUPAP Conference on Few Body Problems in Physics CY MAR 06-10, 2000 CL NATL TAIWAN UNIV, TAIPEI, TAIWAN HO NATL TAIWAN UNIV C1 Hokkaido Univ, Grad Sch Sci, Div Phys, Sapporo, Hokkaido 0600810, Japan. KEK, High Energyb Accelerator Res Org, Inst Particle & Nucl Study, Tsukuba, Ibaraki 3050801, Japan. Gifu Univ, Fac Engn, Gifu 5011193, Japan. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 31911, Japan. RP Ohnishi, A (reprint author), Hokkaido Univ, Grad Sch Sci, Div Phys, Sapporo, Hokkaido 0600810, Japan. RI Ohnishi, Akira/F-7403-2011 OI Ohnishi, Akira/0000-0003-1513-0468 NR 11 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 12 PY 2001 VL 684 BP 595C EP 597C PG 3 WC Physics, Nuclear SC Physics GA 413TU UT WOS:000167628700121 ER PT J AU Brown, HN Bunce, G Carey, RM Cushman, P Danby, GT Debevec, PT Deile, M Deng, H Deninger, W Dhawan, SK Druzhinin, VP Duong, L Efstathiadis, E Farley, FJM Fedotovich, GV Giron, S Gray, F Grigoriev, D Grosse-Perdekamp, M Grossmann, A Hare, MF Hertzog, DW Hughes, VW Iwasaki, M Jungmann, K Kawall, D Kawamura, M Khazin, BI Kindem, J Krienen, F Kronkvist, I Larsen, R Lee, YY Logashenko, I McNabb, R Meng, W Mi, J Miller, JP Morse, WM Nikas, D Onderwater, CJG Orlov, Y Ozben, CS Paley, JM Polly, C Pretz, J Prigl, R Putlitz, GZ Redin, SI Rind, O Roberts, BL Ryskulov, N Sedykh, S Semertzidis, YK Shatunov, YM Sichtermann, EP Solodov, E Sossong, M Steinmetz, A Sulak, LR Timmermans, C Trofimov, A Urner, D von Walter, P Warburton, D Winn, D Yamamoto, A Zimmerman, D AF Brown, HN Bunce, G Carey, RM Cushman, P Danby, GT Debevec, PT Deile, M Deng, H Deninger, W Dhawan, SK Druzhinin, VP Duong, L Efstathiadis, E Farley, FJM Fedotovich, GV Giron, S Gray, F Grigoriev, D Grosse-Perdekamp, M Grossmann, A Hare, MF Hertzog, DW Hughes, VW Iwasaki, M Jungmann, K Kawall, D Kawamura, M Khazin, BI Kindem, J Krienen, F Kronkvist, I Larsen, R Lee, YY Logashenko, I McNabb, R Meng, W Mi, J Miller, JP Morse, WM Nikas, D Onderwater, CJG Orlov, Y Ozben, CS Paley, JM Polly, C Pretz, J Prigl, R Putlitz, GZ Redin, SI Rind, O Roberts, BL Ryskulov, N Sedykh, S Semertzidis, YK Shatunov, YM Sichtermann, EP Solodov, E Sossong, M Steinmetz, A Sulak, LR Timmermans, C Trofimov, A Urner, D von Walter, P Warburton, D Winn, D Yamamoto, A Zimmerman, D CA Muon g-2 Collaborat TI Precise measurement of the positive muon anomalous magnetic moment SO PHYSICAL REVIEW LETTERS LA English DT Article ID E(+)E(-) ANNIHILATION; CROSS-SECTION; DIPOLE-MOMENT; (G-2)(MU); NMR AB A precise measurement of the anomalous g value, a(mu) = (g - 2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a(mu+) = 11 659 202(14) (6) X 10(-10) (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a(mu)(SM) = 11 659 159.6(6.7) X 10(-10) (0.57 ppm) and a(mu)(exp) - a(mu)(SM) = 43(16) X 10(-10) in which a(mu)(exp) is the world average experimental value. C1 Boston Univ, Dept Phys, Boston, MA 02215 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. Cornell Univ, Newman Lab, Ithaca, NY 14853 USA. Fairfield Univ, Fairfield, CT 06430 USA. Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan. Univ Minnesota, Dept Phys, Minneapolis, MN 55455 USA. Tokyo Inst Technol, Tokyo 152, Japan. Yale Univ, Dept Phys, New Haven, CT 06520 USA. RP Brown, HN (reprint author), Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA. RI Jungmann, Klaus/A-7142-2010; jungmann, klaus/H-1581-2013; Semertzidis, Yannis K./N-1002-2013; Logashenko, Ivan/A-3872-2014; Iwasaki, Masahiko/M-8433-2014; OI jungmann, klaus/0000-0003-0571-4072; Iwasaki, Masahiko/0000-0002-3460-9469; Gray, Frederick/0000-0003-4073-8336 NR 19 TC 492 Z9 492 U1 0 U2 16 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 MAR 12 PY 2001 VL 86 IS 11 BP 2227 EP 2231 DI 10.1103/PhysRevLett.86.2227 PG 5 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200010 PM 11289896 ER PT J AU Mahmood, AH Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D McGee, S Perera, LP Zhou, GJ Lipeles, E Pappas, SP Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F Jaffe, DE Masek, G Paar, HP Potter, EM Prell, S Sharma, V Asner, DM Eppich, A Hill, TS Morrison, RJ Nelson, HN Briere, RA Chen, GP Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Galik, RS Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kandaswamy, J Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Nordberg, E Patterson, JR Peterson, D Riley, D Thayer, JG Urner, D Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Golling, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, KW Janicek, R Patel, PM Sadoff, AJ Ammar, R Bean, A Besson, D Davis, R Kwak, N Zhao, X Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Stepaniak, CJ Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Eckhart, E Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Pedlar, TK Schwarthoff, H Thayer, JB von Toerne, E Zoeller, MM Richichi, SJ Severini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Zhou, X Coan, TE Fadeyev, V Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Kopp, S AF Mahmood, AH Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D McGee, S Perera, LP Zhou, GJ Lipeles, E Pappas, SP Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F Jaffe, DE Masek, G Paar, HP Potter, EM Prell, S Sharma, V Asner, DM Eppich, A Hill, TS Morrison, RJ Nelson, HN Briere, RA Chen, GP Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Galik, RS Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kandaswamy, J Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Nordberg, E Patterson, JR Peterson, D Riley, D Thayer, JG Urner, D Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Golling, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, KW Janicek, R Patel, PM Sadoff, AJ Ammar, R Bean, A Besson, D Davis, R Kwak, N Zhao, X Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Stepaniak, CJ Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Eckhart, E Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Pedlar, TK Schwarthoff, H Thayer, JB von Toerne, E Zoeller, MM Richichi, SJ Severini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Zhou, X Coan, TE Fadeyev, V Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Kopp, S CA CLEO Collaboration TI Measurement of the Lambda(+)(c) lifetime SO PHYSICAL REVIEW LETTERS LA English DT Article ID MESON LIFETIMES; DETECTOR; D+ AB The Lambda (+)(c) lifetime is measured using 9.0 fb(-1) of e(+)e(-) annihilation data collected on or just below the Y (4S) resonance with the CLEO ILV detector at CESR. Using an unbinned maximum likelihood fit, the Lambda (+)(c) lifetime is measured to be 179.6 +/- 6.9(stat) +/- 4.4(syst) fs. The precision of this colliding beam measurement is comparable to other measurements, which are based on fixed-target experiments, with different systematic uncertainties. C1 Univ Texas, Edinburg, TX 78539 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. Inst Particle Phys, Ottawa, ON, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Univ Texas, Austin, TX 78712 USA. RP Mahmood, AH (reprint author), Univ Texas, Edinburg, TX 78539 USA. RI Warburton, Andreas/N-8028-2013; Briere, Roy/N-7819-2014; OI Warburton, Andreas/0000-0002-2298-7315; Briere, Roy/0000-0001-5229-1039; Poling, Ronald/0000-0001-7305-4702 NR 12 TC 8 Z9 8 U1 0 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 MAR 12 PY 2001 VL 86 IS 11 BP 2232 EP 2236 DI 10.1103/PhysRevLett.86.2232 PG 5 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200011 PM 11289897 ER PT J AU Hofmann, I Qiang, J Ryne, RD AF Hofmann, I Qiang, J Ryne, RD TI Collective resonance model of energy exchange in 3D nonequipartitioned beams SO PHYSICAL REVIEW LETTERS LA English DT Article ID LINEAR ACCELERATORS; SPACE-CHARGE; STABILITY; EQUILIBRIUM AB Energy exchange between the longitudinal and transverse degrees of freedom of nonequipartitioned bunched beams (non-neutral plasmas) is investigated by means of 3D simulation. It is found that collective instability may lead to energy transfer in the direction of equipartition, without full progression to it, in certain bounded regions of parameter space where internal resonance conditions are satisfied, in good agreement: with stability charts from an earlier derived 2D Vlasov analysis. Nonequipartitioned stable equilibria, however, exist in relatively wide regimes of parameter space. This provides evidence that such regimes may be safely used in the design of future high-intensity linacs. C1 GSI Darmstadt, D-64291 Darmstadt, Germany. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hofmann, I (reprint author), GSI Darmstadt, Planckstr 1, D-64291 Darmstadt, Germany. NR 21 TC 22 Z9 22 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 MAR 12 PY 2001 VL 86 IS 11 BP 2313 EP 2316 DI 10.1103/PhysRevLett.86.2313 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200031 PM 11289917 ER PT J AU Dewar, RL Cuthbert, P Ball, R AF Dewar, RL Cuthbert, P Ball, R TI Strong "quantum" chaos in the global ballooning mode spectrum of three-dimensional plasmas SO PHYSICAL REVIEW LETTERS LA English DT Article ID IDEAL MAGNETOHYDRODYNAMICS; INSTABILITIES; STELLARATOR; DESIGN AB The spectrum of ideal magnetohydrodynamic (MHD) pressure-driven (ballooning) modes in strongly nonaxisymmetric toroidal systems is difficult to analyze numerically owing to the singular nature of ideal MHD caused by lack of an inherent scale length. In this paper, ideal MHD is regularized by using a k-space cutoff, making the ray tracing for the WKB ballooning formalism a chaotic Hamiltonian billiard problem. The minimum width of the toroidal Fourier spectrum needed for resolving toroidally localized ballooning modes with a global eigenvalue code is estimated from the Weyl formula. This phase-space-volume estimation method is applied to two stellarator cases. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Dewar, RL (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. RI Dewar, Robert/B-1300-2008; Ball, Rowena/A-5973-2008 OI Dewar, Robert/0000-0002-9518-7087; Ball, Rowena/0000-0002-3551-3012 NR 25 TC 13 Z9 13 U1 0 U2 2 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 MAR 12 PY 2001 VL 86 IS 11 BP 2321 EP 2324 DI 10.1103/PhysRevLett.86.2321 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200033 PM 11289919 ER PT J AU Brackbill, JU Knoll, DA AF Brackbill, JU Knoll, DA TI Transient magnetic reconnection and unstable shear layers SO PHYSICAL REVIEW LETTERS LA English DT Article ID KELVIN-HELMHOLTZ INSTABILITY; EARTHS MAGNETOPAUSE; BOUNDARY; MHD AB We study three-dimensional magnetic reconnection caused by the Kelvin-Helmholtz (KH) instability and differential rotation in subsonic and sub-Alfvenic flows. The flows, which are modeled by the resistive magnetohydrodynamic equations with constant resistivity, are stable in the direction of the magnetic field but unstable perpendicular to the magnetic field. Localized transient reconnection is observed on the KH time scale, and kinetic energy increases with decreasing resistivity. As in flux-transfer events in the Earth's magnetopause boundary layer, bipolar structures in the normal flux and bidirectional jetting away from reconnection zones are observed. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Brackbill, JU (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 18 TC 26 Z9 26 U1 0 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 MAR 12 PY 2001 VL 86 IS 11 BP 2329 EP 2332 DI 10.1103/PhysRevLett.86.2329 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200035 PM 11289921 ER PT J AU Li, MZ Wendelken, JF Liu, BG Wang, EG Zhang, ZY AF Li, MZ Wendelken, JF Liu, BG Wang, EG Zhang, ZY TI Decay characteristics of surface mounds with contrasting interlayer mass transport channels SO PHYSICAL REVIEW LETTERS LA English DT Article ID ADATOM DIFFUSION; GROWTH; NANOSTRUCTURES; NUCLEATION; AG(111); AG AB The decay characteristics of three-dimensional (3D) islands formed on surfaces are investigated theoretically considering two types of interlayer mass transport mechanisms. If an adatom on a given layer can easily descend from any site along the periphery of the layer, an optimal island slope and a constant terrace width will be selected during the decay. In contrast,if the adatom can descend primarily through selective (such as kinked) sites, the decay will be accompanied by a gradual increase in the island slope. These generic conclusions provide the basis for a microscopic understanding of the decay of nanostructures in fcc(111) and fcc(100) metal homoepitaxy and are applicable to other systems as well. C1 Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Li, MZ (reprint author), Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. OI Liu, Bang-Gui/0000-0002-6030-6680 NR 19 TC 21 Z9 24 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 MAR 12 PY 2001 VL 86 IS 11 BP 2345 EP 2348 DI 10.1103/PhysRevLett.86.2345 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200039 PM 11289925 ER PT J AU Loveridge-Smith, A Allen, A Belak, J Boehly, T Hauer, A Holian, B Kalantar, D Kyrala, G Lee, RW Lomdahl, P Meyers, MA Paisley, D Pollaine, S Remington, B Swift, DC Weber, S Wark, JS AF Loveridge-Smith, A Allen, A Belak, J Boehly, T Hauer, A Holian, B Kalantar, D Kyrala, G Lee, RW Lomdahl, P Meyers, MA Paisley, D Pollaine, S Remington, B Swift, DC Weber, S Wark, JS TI Anomalous elastic response of silicon to uniaxial shock compression on nanosecond time scales SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY-DIFFRACTION; CRYSTALS; DISLOCATION; MOBILITY AB We have used x-ray diffraction with subnanosecond temporal resolution to measure the: lattice parameters of orthogonal planes in shock compressed single crystals of silicon (Si) and copper (Cu). Despite uniaxial compression along the (400) direction of Si reducing the lattice spacing by nearly 11%, no observable changes occur in planes with normals orthogonal to the shock propagation direction; In contrast, shocked Cu shows prompt hydrostaticlike compression. These results are consistent with simple estimates of plastic strain rates based on dislocation velocity data. C1 Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Rochester, Laser Energet Lab, Rochester, NY 14620 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. RP Loveridge-Smith, A (reprint author), Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England. RI Meyers, Marc/A-2970-2016 OI Meyers, Marc/0000-0003-1698-5396 NR 21 TC 149 Z9 150 U1 3 U2 33 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 MAR 12 PY 2001 VL 86 IS 11 BP 2349 EP 2352 DI 10.1103/PhysRevLett.86.2349 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200040 PM 11289926 ER PT J AU Burns, CA Platzman, PM Sinn, H Alatas, A Alp, EE AF Burns, CA Platzman, PM Sinn, H Alatas, A Alp, EE TI Evidence for an instability near twice the Fermi wave vector in the low electronic density liquid metal Li(NH3)(4) SO PHYSICAL REVIEW LETTERS LA English DT Article ID DEFINED COLLECTIVE EXCITATIONS; DYNAMICS; SCATTERING; AMMONIA; LITHIUM AB We report high-resolution inelastic x-ray scattering measurements in the metallic liquid Li(NH3)(4), which to a good approximation can be treated as a dilute alkali metal. We see a well-defined excitation out to large momentum transfers. This excitation shows a strong softening at wave vectors near the first peak in the structure factor, which occurs near twice the Fermi momentum. C1 Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA. Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Burns, CA (reprint author), Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA. NR 19 TC 18 Z9 18 U1 0 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 MAR 12 PY 2001 VL 86 IS 11 BP 2357 EP 2360 DI 10.1103/PhysRevLett.86.2357 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200042 PM 11289928 ER PT J AU Finnemore, DK Ostenson, JE Bud'ko, SL Lapertot, G Canfield, PC AF Finnemore, DK Ostenson, JE Bud'ko, SL Lapertot, G Canfield, PC TI Thermodynamic and transport properties of superconducting (MgB2)-B-10 SO PHYSICAL REVIEW LETTERS LA English DT Article AB Transport and thermodynamic properties of a sintered pellet of the newly discovered MgB2 superconductor have been measured to determine the characteristic critical magnetic fields and critical current densities. Bath resistive transition and magnetization data give similar values of the upper critical field, H-c2, with magnetization data giving dH(c2)/dT = 0.44 T/K at the transition temperature of T-c = 40.2 K. Close to the transition temperature, magnetization curves are thermodynamically reversible, but at low temperatures the trapped flux can be on the order of 1 T. The value of dH(c)/dT at T-c is estimated to be about 12 mT/K, a value similar to classical superconductors like Sn. Hence, the Ginzburg-Landau parameter kappa similar to 26. Estimates of the critical supercurrent density, J(c), using hysteresis loops and the Bean model, give critical current densities an the order or 10(5) A/cm(2). Hence the supercurrent coupling through the grain boundaries is comparable to intermetallics Like Nb3Sn. C1 US Dept Energy, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Lapertot, G (reprint author), US Dept Energy, Ames Lab, Ames, IA 50011 USA. RI LAPERTOT, Gerard/B-3354-2008; Canfield, Paul/H-2698-2014 NR 8 TC 420 Z9 440 U1 7 U2 36 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 MAR 12 PY 2001 VL 86 IS 11 BP 2420 EP 2422 DI 10.1103/PhysRevLett.86.2420 PG 3 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200058 PM 11289944 ER PT J AU Canfield, PC Finnemore, DK Bud'ko, SL Ostenson, JE Lapertot, G Cunningham, CE Petrovic, C AF Canfield, PC Finnemore, DK Bud'ko, SL Ostenson, JE Lapertot, G Cunningham, CE Petrovic, C TI Superconductivity in dense MgB2 wires SO PHYSICAL REVIEW LETTERS LA English DT Article AB MgB2 becomes superconducting just below 40 K. Whereas porous polycrystalline samples of MgB2 can be synthesized from boron powders, in this Letter we demonstrate that dense wires of MgB2 can be prepared by exposing boron filaments to Mg vapor. The resulting wires have a diameter of 160 mum, are better than 80% dense, and manifest the full chi = -1/4 pi shielding in the superconducting state. Temperature-dependent resistivity measurements indicate that MgB2 is a highly conducting metal in the normal state with rho (40 K) = 0.38 mu Omega cm. By using this value, an electronic mean-free path, l approximate to 600 Angstrom can be estimated, indicating that MgB2 wires are well within the clean limit. T-c, H-c2(T), and J(c) data indicate that MgB2 manifests comparable or better superconducting properties in dense wire form than it manifests as a sintered pellet. C1 US Dept Energy, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Lapertot, G (reprint author), US Dept Energy, Ames Lab, Ames, IA 50011 USA. RI LAPERTOT, Gerard/B-3354-2008; Petrovic, Cedomir/A-8789-2009; Canfield, Paul/H-2698-2014 OI Petrovic, Cedomir/0000-0001-6063-1881; NR 14 TC 470 Z9 486 U1 10 U2 52 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 MAR 12 PY 2001 VL 86 IS 11 BP 2423 EP 2426 DI 10.1103/PhysRevLett.86.2423 PG 4 WC Physics, Multidisciplinary SC Physics GA 410NC UT WOS:000167445200059 PM 11289945 ER PT J AU Camassa, R Zenchuk, AI AF Camassa, R Zenchuk, AI TI On the initial value problem for a completely integrable shallow water wave equation SO PHYSICS LETTERS A LA English DT Article ID CAMASSA-HOLM EQUATION; PEAKED SOLITONS AB We present an algorithm for solving the initial value problem on the infinite line for a wave equation arising in the study of long waves at the free surface of water. The algorithm exploits the link between the hierarchy of the shallow water equation and that of the modified Korteweg-de Vries equation. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Univ Arizona, Dept Math, Tucson, AZ 85721 USA. Univ N Carolina, Dept Math, Chapel Hill, NC 27599 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Zenchuk, AI (reprint author), Univ Arizona, Dept Math, Tucson, AZ 85721 USA. NR 17 TC 19 Z9 20 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAR 12 PY 2001 VL 281 IS 1 BP 26 EP 33 DI 10.1016/S0375-9601(01)00070-6 PG 8 WC Physics, Multidisciplinary SC Physics GA 415AD UT WOS:000167697600005 ER PT J AU Sartori, L Ramusino, AC Del Guerra, A Marchesini, R Tripiccione, R AF Sartori, L Ramusino, AC Del Guerra, A Marchesini, R Tripiccione, R TI Low-noise front-end amplifier and channel encoder for a 2-D X-ray digital imaging system with single photon counting capability SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st International Workshop on Radiation Imaging Detectors CY JUN 13-17, 1999 CL SUNDSVALL, SWEDEN SP European Commiss, Teknikvetenskapliga Forskningradet, Sundsvalls Kommun, REGAM Med Syst Int AB DE digital imaging; front-end amplifier; digital encoder ID DETECTOR AB We describe two VLSI CMOS ICs for 2-D X-ray digital imaging systems with single photon counting capability: a low noise front-end analog amplifier and an 80 MHz synchronous digital encoder. Our VLSI system will be optimized to perform X-Y coincidences with double-sided microstrip digital detector. The main application we are investigating is stereotaxic mammography, because of low X-ray energy used and the small area involved. (C) 2001 Published by Elsevier Science B.V. C1 Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy. Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy. Ist Nazl Fis Nucl, Sez Pisa, I-56100 Pisa, Italy. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Sartori, L (reprint author), Univ Ferrara, Dipartmento Fis, Via Paradiso 12, I-44100 Ferrara, Italy. OI tripiccione, raffaele/0000-0002-8516-2492; Cotta Ramusino, Angelo/0000-0003-1727-2478 NR 5 TC 2 Z9 2 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 MAR 11 PY 2001 VL 460 IS 1 BP 213 EP 220 DI 10.1016/S0168-9002(00)01118-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 413EM UT WOS:000167597000031 ER PT J AU Hoffman, RD Woosley, SE Weaver, TA AF Hoffman, RD Woosley, SE Weaver, TA TI Nucleosynthesis below A=100 in massive stars SO ASTROPHYSICAL JOURNAL LA English DT Article DE nuclear reactions, nucleosynthesis, abundances; supernovae : general ID THERMONUCLEAR REACTION-RATES; S-PROCESS NUCLEOSYNTHESIS; GIANT BRANCH STARS; GALACTIC ENRICHMENT; MODEL CALCULATIONS; NEUTRON-CAPTURE; CROSS-SECTIONS; CORE-COLLAPSE; II SUPERNOVAE; P-PROCESS AB The production of nuclei up to and including the weak s-process component at A approximate to 60-90 is calculated for all stages of stable and explosive nuclear burning in stars of 15, 20, and 25 M. with initial solar metallicity. An extended nuclear reaction network of 480 isotopes is employed along with approximately two dozen recent revisions to key nuclear reaction rates. As noted previously, the new rates suggest a greatly diminished production of O-17 and O-18 in massive stars. Ne-22 is also moderately enhanced. We find that a combination of preexplosive s-process, gamma -process, and (mild) r-processes in massive stars gives a consistently solar production of almost all isotopes from mass 64 through 90. However, even after the late stages of evolution are complete and the explosion is over, this same group of elements is overproduced compared to what is needed for the Sun, especially in the 25 M. model. C1 Univ Calif Lawrence Livermore Natl Lab, Nucl Theory & Modeling Grp, Livermore, CA 94550 USA. Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA. RP Hoffman, RD (reprint author), Univ Calif Lawrence Livermore Natl Lab, Nucl Theory & Modeling Grp, Livermore, CA 94550 USA. NR 42 TC 38 Z9 38 U1 0 U2 1 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 MAR 10 PY 2001 VL 549 IS 2 BP 1085 EP 1092 DI 10.1086/319463 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 413GX UT WOS:000167605200034 ER PT J AU Pradhan, AK Nahar, SN Zhang, HL AF Pradhan, AK Nahar, SN Zhang, HL TI Unified electronic recombination of Ne-like Fe XVII: Implications for modeling X-ray plasmas SO ASTROPHYSICAL JOURNAL LA English DT Article DE atomic data; atomic processes; line : formation; X-rays : general ID PHOTOIONIZATION CROSS-SECTIONS; HIGHLY-CHARGED IONS; DIELECTRONIC RECOMBINATION; RELATIVISTIC CALCULATIONS; RATE COEFFICIENTS; ULTRAVIOLET; SCATTERING; RESONANCE; SPECTRA; REGION AB Unified recombination cross sections and rates are computed for (e + Fe XVIII) --> Fe XVII including nonresonant and resonant (radiative recombination [RR] and dielectronic recombination [DR]) processes in an ab initio manner with relativistic fine structure. The highly resolved theoretical cross sections exhibit considerably more resonance structures than observed in the heavy-ion storage ring measurements at Heidelberg, Germany. Nonetheless, the detailed resonance complexes agree well with experimental results, and the unified rates agree with the sum of experimentally derived DR and theoretical RR rates to similar to 20%, within experimental or theoretical uncertainties. Theoretical results may provide estimates of field ionization of Rydberg levels close to the DR peak and non-resonant background contributions particularly close to the RR peak as E --> 0. More generally, the unified results avoid the physical and practical problems in astrophysical models inherent in the separation of electronic recombination into RR and DR on the one hand and further subdivision into low-energy Deltan = 0 DR and high-energy Deltan > 0 DR in photoionized and collisionally ionized X-ray plasmas on the other hand. C1 Ohio State Univ, Dept Astron, Columbus, OH 43210 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA. NR 28 TC 15 Z9 15 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 MAR 10 PY 2001 VL 549 IS 2 BP L265 EP L268 DI 10.1086/319174 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 417JB UT WOS:000167830900026 ER PT J AU Chen, K Xie, S Bell, AT Iglesia, E AF Chen, K Xie, S Bell, AT Iglesia, E TI Structure and properties of oxidative dehydrogenation catalysts based on MoO3/Al2O3 SO JOURNAL OF CATALYSIS LA English DT Article ID X-RAY-ABSORPTION; MOLYBDENUM OXIDE CATALYSTS; SUPPORTED METAL-OXIDES; RAMAN-SPECTROSCOPY; SELECTIVE OXIDATION; ALUMINA CATALYSTS; GAMMA-ALUMINA; K-EDGE; PROPANE; SURFACE AB The effects of MoOx structure on propane oxidative dehydrogenation (ODH) rates and selectivity were examined on Al2O3- supported molybdenum oxide catalysts with a wide range of Mo surface density (0.4-12 Mo/nm(2)). X-ray diffraction and Raman, UV-visible, and X-ray absorption spectroscopies showed that the structure of dispersed molybdena depends strongly on the Mo surface density. Two-dimensional MoOx oligomers formed preferentially for Mo surface densities below 4 Mo/nm(2). At higher surface densities, these MoOx oligomers coexist on Al2O3 surfaces with three-dimensional MoO3. UV-visible edge energies decrease with increasing Mo surface density, consistent with the growth of MoOx structures. The evolution of near-edge spectral features in the X-ray absorption spectra and the gradual appearance of a Mo-Mo scattering peak in the radial structure function confirmed the growth of MoOx domains with increasing surface density. ODH rates per Mo atom increased with increasing Mo surface density and reached a maximum value for samples with similar to4.5 Mo/nm(2); this behavior reflects an increase in the reactivity of surface Mo species, because all MoOx species are exposed at domain surfaces in this surface density range. As also shown for VOx-based catalysts, turnover rates are higher on two-dimensional domains than on isolated monomers and they increase as the MoOx domain size increases. The rates of reduction of MoOx species in H-2 or C3H8 were probed using kinetic and X-ray absorption methods; these reduction rates increased in parallel with ODH rates as the MoOx surface density increased, apparently as a result of the ability of larger domains to delocalize the higher electron density that accompanies the reduction process. As the surface density increased above 4.5 Mo/nm(2), ODH rates (per Mo atom) decrease, as a result of the loss of accessibility caused by the formation of MoO3 crystallites. For these latter samples, the ODH rate per BET surface area approached a constant value as the surface density increased, because all exposed surfaces in these samples reside within two- or three-dimensional MoO3 structures with similar reactivity. The ratio of rate constants for propane ODH and propane combustion reactions increased with increasing surface density and then remained constant for values above 5 Mo/nm(2). These effects appear to reflect the tendency of Al-O-Mo species to adsorb alkoxide intermediates and favor their sequential oxidation to COx. Propene combustion rate constants also decreased relative to those for propane ODH as two-dimensional structures form with increasing Mo surface density. (C) 2001 Academic Press. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RP Iglesia, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RI Iglesia, Enrique/D-9551-2017; OI Iglesia, Enrique/0000-0003-4109-1001; Bell, Alexis/0000-0002-5738-4645 NR 50 TC 184 Z9 188 U1 12 U2 80 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9517 J9 J CATAL JI J. Catal. PD MAR 10 PY 2001 VL 198 IS 2 BP 232 EP 242 DI 10.1006/jcat.2000.3125 PG 11 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 414DH UT WOS:000167650300009 ER PT J AU Spelt, PDM Norato, MA Sangani, AS Greenwood, MS Tavlarides, LL AF Spelt, PDM Norato, MA Sangani, AS Greenwood, MS Tavlarides, LL TI Attenuation of sound in concentrated suspensions: theory and experiments SO JOURNAL OF FLUID MECHANICS LA English DT Article ID COMPOSITES; EQUATIONS; COEFFICIENTS; CONDUCTIVITY; SPHERES AB Ensemble-averaged equations are derived for small-amplitude acoustic wave propagation through non-dilute suspensions. The equations are closed by introducing effective properties of the suspension such as the compressibility, density, viscoelasticity, heat capacity, and conductivity. These effective properties are estimated as a function of frequency, particle volume fraction, and physical properties of the individual phases using a self-consistent, effective-medium approximation. The theory is shown to be in excellent agreement with various rigorous analytical results accounting for multiparticle interactions. The theory is also shown to agree well with the experimental data on concentrated suspensions of small polystyrene particles in water obtained by Allegra & Hawley and for glass particles in water obtained in the present study. C1 Syracuse Univ, Dept Chem Engn & Mat Sci, Syracuse, NY 13244 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Sangani, AS (reprint author), Syracuse Univ, Dept Chem Engn & Mat Sci, Syracuse, NY 13244 USA. RI Spelt, Peter/J-2509-2014 NR 24 TC 16 Z9 16 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI PORT CHESTER PA 110 MIDLAND AVE, PORT CHESTER, NY 10573-4930 USA SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD MAR 10 PY 2001 VL 430 BP 51 EP 86 DI 10.1017/S002211200000272X PG 36 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 421AT UT WOS:000168040500003 ER PT J AU Mitchell, SG Matmon, A Bierman, PR Enzel, Y Caffee, M Rizzo, D AF Mitchell, SG Matmon, A Bierman, PR Enzel, Y Caffee, M Rizzo, D TI Displacement history of a limestone normal fault scarp, northern Israel, from cosmogenic Cl-36 SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SAN-ANDREAS FAULT; TERRESTRIAL ROCKS; PRODUCTION-RATES; EROSION RATES; EARTHQUAKES; CALIFORNIA; EXPOSURE; INSITU; SLIP; RECURRENCE AB The abundance of cosmogenic Cl-36, measured in 41 limestone samples from a 9 m high bedrock fault scarp, allows us to construct the 14 kyr fault displacement history of the Nahef East normal fault, northern Israel (300 m above sea level, N33 degrees latitude). The Nahef East fault is one of a series of fault scarps located along the 700 m high Zurim Escarpment, a major geomorphic feature. Samples at the top of the scarp have the highest nuclide concentrations (79 x 10(4) atoms (g rock)(-1)); samples at the base have the lowest (11 x 10(4) atoms (g rock)(-1)). Using chemical data from the samples, Nahef East fault scarp geometry, and surface and subsurface production rates for the Cl-36-producing reactions, we have constructed a numerical model that calculates Cl-36 accumulation on a scarp through time, given a series of unique displacement scenarios. The resulting model Cl-36 concentrations are compared to those measured in the scarp samples. Faulting histories that result in a good match between measured and modeled Cl-36 abundances show three distinct periods of fault activity during the past 14 kyr with over 6 vertical meters of motion occurring during a 3 kyr time period in the middle Holocene, Smaller amounts of displacement occurred before and after the period of most rapid motion. The episodic behavior of the Nahef East fault indicates that the average displacement rate of this fault system has varied through time. C1 Univ Vermont, Dept Geol, Burlington, VT 05405 USA. Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel. Univ Vermont, Dept Civil & Environm Engn, Burlington, VT 05405 USA. RP Mitchell, SG (reprint author), Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA. EM sgml@u.washington.edu; amatmon@zoo.uvm.edu; pbierman@zoo.uvm.edu; enzel@vms.huji.ac.il; mcaffee@llnl.gov; drizzo@emba.uvm.edu RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 50 TC 37 Z9 43 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD MAR 10 PY 2001 VL 106 IS B3 BP 4247 EP 4264 DI 10.1029/2000JB900373 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 409JA UT WOS:000167379500020 ER PT J AU Meriaudeau, F Ferrell, TL Arakawa, ET Wig, A Passian, A Thundat, T Shen, WJ Patel, S Kraemer, FB AF Meriaudeau, F Ferrell, TL Arakawa, ET Wig, A Passian, A Thundat, T Shen, WJ Patel, S Kraemer, FB TI Study of different hormone-sensitive lipase concentrations using a surface plasmon resonance sensor SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE surface plasmon sensor; HSL; refractive index; ATR ID BINDING PROTEIN; OLIGOMERIZATION; GRATINGS; DOMAIN; SITE AB This paper presents a series of experimental results including those based on the surface plasmon resonance (SPR) to investigate the parameters for determining the concentration and form of various hormone sensitive lipase (HSL) solutions. HSL is a rate-limiting enzyme for the metabolism of stored fat. This small protein was not previously known to possess optical properties permitting studies by attenuated total internal reflection (ATR) spectroscopy or by the SPR method. Therefore, basic physical measurements were needed. The HSL solutions are typically contained in different buffers that chemically affect the metal layers in the SPR experiments and cause problems with film integrity. Different experiments employing different metal layers were conducted. The results were compared with those of the ATR method, showing the expected greater sensitivity of the surface plasmon resonance method. It was determined that the protein solutions may be usefully examined by both methods ultimately permitting measurement of oligomer formation as a function of concentration in future work. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Life Sci, Photometr Grp, Oak Ridge, TN 37830 USA. Stanford Univ, Dept Med, Div Endocrinol, Stanford, CA 94305 USA. VA Palo Alto Hlth Care Syst, Palo Alto, CA 94304 USA. RP Meriaudeau, F (reprint author), Le2I, 12 Rue Fonderie, F-71200 Le Creusot, France. NR 29 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD MAR 10 PY 2001 VL 73 IS 2-3 BP 192 EP 198 DI 10.1016/S0925-4005(00)00691-2 PG 7 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA 410QF UT WOS:000167450100016 ER PT J AU Gan, S Liang, Y Baer, DR Grant, AW AF Gan, S Liang, Y Baer, DR Grant, AW TI Effects of titania surface structure on the nucleation and growth of Pt nanoclusters on rutile TiO2(110) SO SURFACE SCIENCE LA English DT Article DE titanium oxide; surface structure, morphology, roughness, and topography; scanning tunneling microscopy; clusters ID SCANNING-TUNNELING-MICROSCOPY; METAL-SUPPORT INTERACTION; FILMS; CLUSTER; TIO2; OVERLAYERS; PARTICLES; PLATINUM; DEFECTS; STM AB A comparative study was conducted on the interaction of Pt with the (1 x 1) and (1 x 2) surface phases of rutile TiO2(1 1 0). It was found that the surface structure and stoichiometry of TiO2 have profound effects on the formation and growth of nanosized Pt clusters on TiO2(1 1 0). On the (1 x 1) surface, Pt formed randomly distributed, three-dimensional nanoclusters that coalesced and were encapsulated when thermally annealed. In contrast, smaller Pt clusters were identified to adsorb on top of the titanium atomic rows on the (1 x 2) surface and exhibited higher thermal stability. The stronger interaction observed for the Pt on the (1 x 2) surface is due to a charge transfer from Ti to Pt atoms. Vicinal TiO2(1 1 0) surfaces with alternating (1 x 1) and (1 x 2) domains were used to verify the different interactions of Pt for the two domains. Upon Pt deposition, an array of self-organized Pt nanoclusters was formed on this surface. The self-organization is due to different interactions of Pt with the two different surface domains and preferential diffusion of Pt nanoclusters along the titanium atomic rows on the (1 x 2) surface. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Univ Washington, Seattle, WA 98195 USA. RP Liang, Y (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, MS K8-G3,POB 999, Richland, WA 99352 USA. RI Baer, Donald/J-6191-2013 OI Baer, Donald/0000-0003-0875-5961 NR 37 TC 38 Z9 39 U1 3 U2 26 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 10 PY 2001 VL 475 IS 1-3 BP 159 EP 170 PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 409ZY UT WOS:000167416600019 ER PT J AU Chen, YJ Fenn, PT Ng, CY AF Chen, YJ Fenn, PT Ng, CY TI Direct identification of product CH2SH+/CH3S+ structures in the dissociation of CH3CH2SH+ and CH3SCH3+ via collisional activation SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PULSED-FIELD IONIZATION; NONSTATISTICAL BEHAVIOR; CH3SH; PHOTOIONIZATION; PHOTOELECTRON; ENERGY AB We report an experiment on the structural identification of CH3SC/CH2SH+ formed in the collision-induced dissociation reactions of CH3SCH3+ (CH3CH2SH+) + Ar. We found that CH2SH+ is the dominant ion formed in the collision-induced dissociation of CH3CH2SH+, while CH3S+ is produced in abundance along with CH2SH+ in the collision-induced dissociation of CH3SCH3+. The results are attributed to the non-statistical nature of the dissociation processes. (C) 2001 Elsevier Science B.V. All rights reserved. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Ng, CY (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. RI Chen, Yu-Ju/E-9481-2015 NR 17 TC 3 Z9 3 U1 0 U2 2 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 MAR 9 PY 2001 VL 336 IS 1-2 BP 105 EP 108 DI 10.1016/S0009-2614(01)00083-5 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 411YL UT WOS:000167527200017 ER PT J AU Tomkins, BA Sega, GA AF Tomkins, BA Sega, GA TI Determination of thiodiglycol in groundwater using solid-phase extraction followed by gas chromatography with mass spectrometric detection in the selected-ion mode SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE water analysis; environmental analysis; warfare agents; thiodiglycol; sulfur mustard; thiodipropanol; sulfur compounds ID MUSTARD HYDROLYSIS PRODUCTS; CHEMICAL WARFARE AGENTS; LIQUID-CHROMATOGRAPHY; SULFUR MUSTARD; DEGRADATION PRODUCTS; N-NITROSODIMETHYLAMINE; ORGANOSULFUR COMPOUNDS; QUANTITATION; IONIZATION; WATER AB A highly sensitive analytical procedure is described for determining thiodiglycol in groundwater. Samples are initially fortified with 3,3'-thiodipropanol (surrogate), then both species are extracted using sequential solid-phase extraction with both C-18 and Ambersorb 572 columns. The C-18 column, which removes extraneous groundwater components, is discarded; the Ambersorb 572 column is dried thoroughly before eluting polar components with a small volume of dichloromethane. The extract is taken to dryness using dry flowing nitrogen, and the resulting residue is derivatized using N-(tert-butyldimethylsilyl)-N-methyltrifluoroacetamide and pyridine. The derivatized products are diluted to a final volume with toluene, chromatographed using a fused-silica capillary column, and detected with a quadrupole mass spectrometric detector in its selected-ion mode. Two independent, statistically unbiased, procedures were used to evaluate the detection limits for thiodiglycol; the values ranged between 4 and 16 mug l(-1) groundwater. (C) 2001 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Organ Chem & Separat Sect, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Analyt Sci Div, Oak Ridge, TN 37831 USA. RP Tomkins, BA (reprint author), Oak Ridge Natl Lab, Organ Chem & Separat Sect, POB 2008, Oak Ridge, TN 37831 USA. OI Tomkins, Bruce/0000-0001-8520-1415 NR 36 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAR 9 PY 2001 VL 911 IS 1 BP 85 EP 96 DI 10.1016/S0021-9673(00)01222-X PG 12 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 402RR UT WOS:000167002400009 PM 11269599 ER PT J AU Lin, CH Huang, XW Kolbanovskii, A Hingerty, BE Amin, S Broyde, S Geacintov, NE Patel, DJ AF Lin, CH Huang, XW Kolbanovskii, A Hingerty, BE Amin, S Broyde, S Geacintov, NE Patel, DJ TI Molecular topology of polycyclic aromatic carcinogens determines DNA adduct conformation: A link to tumorigenic activity SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE BPh-N-2-G adducts intercalate without base-pair disruption; "fjord" BPh-N-2-G versus "bay" BP-N-2-G adducts; "fjord" BPh-N-2-G versus "fjord" BPh-N-6-A adducts; stereoisomer-related adduct directionality ID EPOXIDE-DEOXYADENOSINE ADDUCTS; BENZOPYRENE DIOL EPOXIDES; CANCER MUTATIONAL HOTSPOTS; RAS CODON-61 SEQUENCE; FEMALE CD RATS; FJORD REGION; EXCISION-REPAIR; MAMMARY CARCINOGENICITY; MODIFIED DEOXYGUANOSINE; DIHYDRODIOL EPOXIDES AB We report below on the solution structures of stereoisomeric "fjord" region trans-anti-benzo[c]phenanthrene-N-2-guanine (designated (BPh)G) adducts positioned opposite cytosine within the (C-(BPh)G-C) (G-C-G) sequence context. We observe intercalation of the phenanthrenyl ring with stereoisomer-dependent directionality, without disruption of the modified (BPh)G.C base-pair. Intercalation occurs to the 5' side of the modified strand for the 1S stereoisomeric adduct and to the 3' side for the 1R stereoisomeric adduct, with the S and R-trans-isomers related to one another by inversion in a mirror plane at all four chiral carbon atoms on the benzylic ring. Intercalation of the fjord region BPh ring into the helix without disruption of the modified base-pair is achieved through buckling of the (BPh)GC base-pair, displacement of the linkage bond from the plane of the (BPh)G base, adaptation of a chair pucker by the BPh benzylic ring and the propeller-like deviation from planarity of the BPh phenanthrenyl ring. It is noteworthy that intercalation without basepair disruption occurs from the minor groove side for S and R-trans-anti BPh-N-2-guanine adducts opposite C, in contrast to our previous demonstration of intercalation without modified base-pair disruption from the major groove side for S and R-trans-anti BPh-N-6-adenine adducts opposite T. Further, these results on fjord region 1S and 1R-trans-anti (BPh)G adducts positioned opposite C are in striking contrast to earlier research with "bay" region benzo[a]pyrene-N-2-guanine (designated (BP)G) adducts positioned opposite cytosine, where 10S and 10R-trans-anti stereoisomers were positioned with opposite directionality in the minor groove without modified base-pair disruption. They also are in contrast to the 10S and 10R-cis-anti stereoisomers of (BP)G adducts opposite C, where the pyrenyl ring is intercalated into the helix with directionality, but the modified base and its partner on the opposite strand are displaced out of the helix. These results are especially significant given the known greater tumorigenic potential of fjord region compared to bay region polycyclic aromatic hydrocarbons. The tumorigenic potential has been linked to repair efficiency such that bay region adducts can be readily repaired while their fjord region counterparts are refractory to repair. Our structural results propose a link between DNA adduct conformation and repair-dependent mutagenic activity, which could ultimately translate into structure-dependent differences in tumorigenic activities. We propose that the fjord region minor groove-linked BPh-N-2-guanine and major groove-linked BPh-N-6-adenine adducts are refractory to repair based on our observations that the phenanthrenyl ring intercafates into the helix without modified base-pair disruption. The helix is therefore minimally perturbed and the phenanthrenyl ring is not available for recognition by the repair machinery. By contrast, the bay region BP-N-2-G adducts are susceptible to repair, since the repair machinery can recognize either the pyrenyl ring positioned in the minor groove for the trans-anti groove-aligned stereoisomers, or the disrupted modified basepair for the cis-anti base-displaced intercalated stereoisomers. (C) 2001 Academic Press. C1 Mem Sloan Kettering Canc Ctr, Cellular Biochem & Biophys Program, New York, NY 10021 USA. NYU, Dept Biol, New York, NY 10003 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. Amer Hlth Fdn, Valhalla, NY 10595 USA. NYU, Dept Chem, New York, NY 10003 USA. RP Patel, DJ (reprint author), Mem Sloan Kettering Canc Ctr, Cellular Biochem & Biophys Program, 1275 York Ave, New York, NY 10021 USA. RI kolbanovskiy, aleksandr/I-7278-2013 FU NCI NIH HHS [CA-20851, CA-17613, CA-46533]; NCPDCID CDC HHS [NIH/NCI-CB-77022-75] NR 47 TC 50 Z9 51 U1 2 U2 6 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAR 9 PY 2001 VL 306 IS 5 BP 1059 EP 1080 DI 10.1006/jmbi.2001.4425 PG 22 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 411LX UT WOS:000167502500012 PM 11237618 ER PT J AU Seki, K Elphic, RC Hirahara, M Terasawa, T Mukai, T AF Seki, K Elphic, RC Hirahara, M Terasawa, T Mukai, T TI On atmospheric loss of oxygen ions from earth through magnetospheric processes SO SCIENCE LA English DT Article ID DAYSIDE MAGNETOSHEATH; GEOTAIL OBSERVATIONS; O+ BEAMS; ESCAPE; MAGNETOTAIL; LOBE/MANTLE; VENUS; MARS AB In Earth's environment, the observed polar outflow rate for O+ ions, the main source of oxygen above gravitational escape energy, corresponds to the Loss of similar to 18% of the present-day atmospheric oxygen over 3 billion years. However, part of this apparent Loss can actually be returned to the atmosphere. Examining loss rates of four escape routes with high-altitude spacecraft observations, we show that the total oxygen Loss rate inferred from current knowledge is about one order of magnitude smaller than the polar O+ outflow rate. This disagreement suggests that there may be a substantial return flux from the magnetosphere to the low-latitude ionosphere. Then the net oxygen Loss over 3 billion years drops to similar to2% of the current atmospheric oxygen content. C1 Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Rikkyo Univ, Dept Phys, Toshima Ku, Tokyo 1718501, Japan. Inst Space & Astronaut Sci, Kanagawa 2298510, Japan. RP Seki, K (reprint author), Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Hongo 7-3-1, Tokyo 1130033, Japan. NR 17 TC 67 Z9 67 U1 1 U2 8 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 9 PY 2001 VL 291 IS 5510 BP 1939 EP 1941 DI 10.1126/science.1058913 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 409TK UT WOS:000167401600038 PM 11239148 ER PT J AU Bowen, BMH Sowell, A Pirkle, LE Schleicher, R Chen, HP Xu, M Caudill, S AF Bowen, BMH Sowell, A Pirkle, LE Schleicher, R Chen, HP Xu, M Caudill, S TI Validation of the Futterman method: An alternative to HPLC for vitamin A determination in serum SO FASEB JOURNAL LA English DT Meeting Abstract C1 Ctr Dis Control & Prevent, ORISE, Atlanta, GA 30341 USA. Ctr Dis Control & Prevent, Atlanta, GA 30341 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A959 EP A959 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454201417 ER PT J AU Clifford, AJ Li, YM Dueker, SR Green, R Buchholz, BA Vogel, JS AF Clifford, AJ Li, YM Dueker, SR Green, R Buchholz, BA Vogel, JS TI Effect of MTHFR mutation on the fate of an oral tracer dose of C-14-folic acid SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. RI Buchholz, Bruce/G-1356-2011 NR 0 TC 1 Z9 1 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A955 EP A955 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454201392 ER PT J AU Dueker, SR Follett, JR Lin, YM Buchholz, B Vogel, JS Clifford, AJ AF Dueker, SR Follett, JR Lin, YM Buchholz, B Vogel, JS Clifford, AJ TI Plasma half-lives of beta-carotene following i.v. infusion of autologous 14C-carotene-labeled plasma in humans SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Davis, Davis, CA 95616 USA. Lawrence Livermore Natl Labs, Livermore, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A953 EP A953 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454201380 ER PT J AU Eisenberg, D Marcotte, E Pellegrini, M Thompson, M Xenarios, I Yeates, T AF Eisenberg, D Marcotte, E Pellegrini, M Thompson, M Xenarios, I Yeates, T TI From genome sequences to protein interactions SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Los Angeles, DOE, Los Angeles, CA 90095 USA. Prot Pathways, Los Angeles, CA 90024 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A724 EP A724 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454200063 ER PT J AU Follett, JR Dueker, SR Lin, YM Buchholz, BA Vogel, JS Clifford, AJ AF Follett, JR Dueker, SR Lin, YM Buchholz, BA Vogel, JS Clifford, AJ TI Application of accelerator mass spectrometry to assess post-prandial association of beta-carotene with plasma lipoproteins SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Davis, Davis, CA 95616 USA. Lawrence Livermore Natl Labs, Livermore, CA USA. RI Buchholz, Bruce/G-1356-2011 NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A953 EP A953 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454201383 ER PT J AU Paulus, MJ Gleason, SS AF Paulus, MJ Gleason, SS TI High resolution micro-computed tomography for small animal research SO FASEB JOURNAL LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A1068 EP A1068 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454202052 ER PT J AU Terwilliger, TC AF Terwilliger, TC TI Structural genomics: Foundation for the future of biology? SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 NR 0 TC 0 Z9 0 U1 0 U2 2 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 8 PY 2001 VL 15 IS 5 BP A724 EP A724 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410TA UT WOS:000167454200062 ER PT J AU Mueller, JA Parsons, BF Butler, LJ Qi, F Sorkhabi, O Suits, AG AF Mueller, JA Parsons, BF Butler, LJ Qi, F Sorkhabi, O Suits, AG TI Competing isomeric product channels in the 193 nm photodissociation of 2-chloropropene and in the unimolecular dissociation of the 2-propenyl radical SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID AB-INITIO CALCULATIONS; ULTRAVIOLET PHOTODISSOCIATION; VINYL-CHLORIDE; EMISSION-SPECTROSCOPY; DOPPLER PROFILES; DYNAMICS; PROPYNE; ALLYL; CL; DEPENDENCE AB This paper presents product translational energy spectroscopy measurements of the primary photofragmentation channels of 2-chloropropene excited at 193 nm and of the unimolecular dissociation of the 2-propenyl radical. Tunable vacuum ultraviolet (VUV) photoionization of the products allows us to distinguish between the various product isomers formed in these processes. The data show evidence for three significant primary reaction channels in the dissociation of 2-chloropropene: An excited-state C-Cl fission channel producing fast Cl atoms, a C-Cl fission channel producing slow Cl atoms, and HCl elimination. A minor C-CH3 fission channel contributes as well. The measured branching of the major primary product channels is: [fast C-Cl]:[slow C-Cl]:[HCl elimination] = 62%:23%:15%. The experiments also allow us to resolve selectively the product branching between the unimolecular dissociation channels of the 2-propenyl radical, a high energy C3H5 isomer; we measure how the branching ratio between the two competing C-H fission channels changes as a function of the radical's internal energy. The data resolve the competition between the unimolecular H + allene and H+propyne product channels from the radical with internal energies from 0 to 18 kcal/mol above the H + propyne barrier. We find that the barrier to H + allene formation from this high-energy C3H5 radical is higher than the barrier to H+propyne formation, in agreement with recent theoretical calculations but in sharp contrast to that predicted for the most stable C3H5 isomer, the allyl radical. The experiments demonstrate a general technique for selectively forming a particular CnHm isomer dispersed by internal energy due to the primary photolysis, thus allowing us to determine the branching between unimolecular dissociation channels as a function of the selected radical isomer's internal energy. (C) 2001 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 Mueller, JA (reprint author), Univ Chicago, James Franck Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA. RI Qi, Fei/A-3722-2012 NR 47 TC 37 Z9 38 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 8 PY 2001 VL 114 IS 10 BP 4505 EP 4521 DI 10.1063/1.1345877 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 409CW UT WOS:000167367800019 ER PT J AU Lee, YC Price, DL Curtiss, LA Ratner, MA Shriver, DF AF Lee, YC Price, DL Curtiss, LA Ratner, MA Shriver, DF TI Structure of the ambient temperature alkali metal molten salt AlCl3/LiSCN SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MELTS AB The structure of the ambient temperature alkali metal molten salt system LiSCN/AlCl3 1:1 adduct was investigated by neutron diffraction, which demonstrates that the aluminum atom is surrounded by three chlorine atoms and one nitrogen atom, indicating the existence of the AlCl3NCS- anion, in which the NCS- coordinates to the Al center through nitrogen. Molecular orbital calculations using ab initio methods are also performed to study the optimized structures of the AlCl3NCS- and its isomer, AlCl3SCN-. The results are consistent with the neutron diffraction data and indicate that AlCl3NCS- is the major anionic complex in the 1:1 LiSCN/AlCl3 adduct. (C) 2001 American Institute of Physics. C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Northwestern Univ, Mat Res Ctr, Evanston, IL 60208 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Lee, YC (reprint author), Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA. RI Price, David Long/A-8468-2013 NR 19 TC 14 Z9 14 U1 1 U2 7 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 8 PY 2001 VL 114 IS 10 BP 4591 EP 4594 DI 10.1063/1.1344609 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 409CW UT WOS:000167367800026 ER PT J AU Smith, GP Dubey, MK Kinnison, DE Connell, PS AF Smith, GP Dubey, MK Kinnison, DE Connell, PS TI Assessing effects of rate parameter changes on ozone models using sensitivity analysis SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID STRATOSPHERIC OZONE; PHOTOLYSIS; O-3; OH AB Effects of recommended rate parameter changes in the NASA JPL-2000 evaluation from JPL-94 values on local ozone concentrations in a 2-D model are predicted using local sensitivity analysis results from the LLNL 2-D diurnally averaged model. Ozone decreases of 5% in the middle stratosphere and 10% increases near the tropopause and upper troposphere are indicated. Altered NO, kinetics are largely responsible for these changes, and increased model NO, levels and ozone depletion from stratospheric aircraft are also expected according to sensitivity analysis. Effects of specific changes, such as the nitric acid formation rate, are examined. New error bars on rate parameters in the evaluation are propagated by the sensitivity coefficients to derive revised kinetics uncertainties for the model ozone calculations at several altitudes, latitudes, and seasons. Middle-upper stratospheric ozone uncertainties of 12% from the catalytic photochemistry are indicated, increasing in the lower stratosphere. C1 SRI Int, Mol Phys Lab, Menlo Park, CA 94025 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Natl Ctr Atmospher Res, Boulder, CO 80307 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Smith, GP (reprint author), SRI Int, Mol Phys Lab, Menlo Park, CA 94025 USA. RI Dubey, Manvendra/E-3949-2010 OI Dubey, Manvendra/0000-0002-3492-790X NR 23 TC 10 Z9 10 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 8 PY 2001 VL 105 IS 9 BP 1449 EP 1455 DI 10.1021/jp002329c PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 407JN UT WOS:000167268600008 ER PT J AU Michelsen, HA Simpson, WR AF Michelsen, HA Simpson, WR TI Relating state-dependent cross sections to non-Arrhenius behavior for the Cl+CH4 reaction SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Review ID QUANTUM SCATTERING CALCULATIONS; POTENTIAL-ENERGY SURFACE; CL ATOM REACTIONS; STRATOSPHERIC CHLORINE; RATE CONSTANTS; CL+CH4->HCL+CH3 REACTION; ANTARCTIC VORTEX; CL+CH4-REVERSIBLE-ARROW-HCL+CH3 REACTION; REACTION CL+CH4->CH3+HCL; HYDROGEN-CHLORIDE AB We have used information gained via differential cross-section experiments of the Cl + CH4 reaction in an analysis of measured thermal rate constants to determine the source of the observed non-Arrhenius behavior. Our results demonstrate that curvature in the Arrhenius plot at temperatures above room temperature can be explained by enhancement of the reaction rate when the symmetric or asymmetric stretch of CH4 is excited. At low temperatures, the apparent curvature can be explained by tunneling and modest reaction-rate enhancement by a low-frequency bending mode of CH4. An analysis of dynamical and thermal measurements of the kinetic isotope effect for Cl + CH4/CD4 indicates that tunneling enhances the reaction probability of hydrogen-atom abstraction by partially relaxing the steric restrictions for the collinear geometry of the transition state. This analysis provides an estimate of rate constants at low (atmospheric) temperatures that is higher than recommended values and provides a prediction of rate constants at high (combustion) temperatures for which measurements are not currently available. We suggest directions for future theoretical and experimental studies based on uncertainties in the current description of this important reaction. C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. Univ Alaska, Dept Chem, Fairbanks, AK 99775 USA. RP Michelsen, HA (reprint author), Sandia Natl Labs, Combust Res Facil, MS 9055,POB 969, Livermore, CA 94551 USA. RI Simpson, William/I-2859-2014 OI Simpson, William/0000-0002-8596-7290 NR 120 TC 34 Z9 35 U1 2 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 8 PY 2001 VL 105 IS 9 BP 1476 EP 1488 DI 10.1021/jp0016784 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 407JN UT WOS:000167268600011 ER PT J AU Donahue, NM Mohrschladt, R Dransfield, TJ Anderson, JG Dubey, MK AF Donahue, NM Mohrschladt, R Dransfield, TJ Anderson, JG Dubey, MK TI Constraining the mechanism of OH+NO2 using isotopically labeled reactants: Experimental evidence for HOONO formation SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID INDUCED FLUORESCENCE MEASUREMENTS; HIGH-PRESSURE FLOW; NO2; KINETICS; TEMPERATURE; CHEMISTRY; EXCHANGE; PRODUCT; REACTOR; H2O AB The reaction of OH with NO2 is central to atmospheric chemistry, and its dynamics can be constrained by studying the kinetics of isotopically labeled (OH)-O-18 with NO2. This labeling opens an isotopic scrambling pathway in the reaction coordinate for nitric acid formation, providing experimental constraints on the high-pressure behavior of the reaction with data obtained at low pressures. This reaction, however, is complicated by the presence of a second product isomer, peroxynitrous acid (HOONO), which does not have a scrambling pathway. We present data for the reaction of (OH)-O-18 with NO2 at room temperature between 4 and 200 Torr. The reaction is rapid and independent of pressure. We also locate the H-atom isomerization transition state and show that the isomerization rate constant is at least an order of magnitude faster than adduct dissociation. These results allow us to accurately constrain the formation rate constant of HONO2, which is a factor of 5 slower than the observed OH removal rate constant at high pressure. We conclude that the difference is due to HOONO formation. Our conclusion is consistent with recent theoretical predictions of this branching, and also provides the only self-consistent reconciliation of the high-pressure data with the remainder of the experimental data set. C1 Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Donahue, NM (reprint author), Carnegie Mellon Univ, Dept Chem & Chem Engn, Pittsburgh, PA 15217 USA. EM nmd+@cmu.edu; dubey@lanl.gov RI Donahue, Neil/A-2329-2008; Dubey, Manvendra/E-3949-2010 OI Donahue, Neil/0000-0003-3054-2364; Dubey, Manvendra/0000-0002-3492-790X NR 25 TC 42 Z9 43 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 8 PY 2001 VL 105 IS 9 BP 1515 EP 1520 DI 10.1021/jp0035582 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 407JN UT WOS:000167268600015 ER PT J AU Klemm, RB Thorn, RP Stief, LJ Buckley, TJ Johnson, RD AF Klemm, RB Thorn, RP Stief, LJ Buckley, TJ Johnson, RD TI Heat of formation of OBrO: Experimental photoionization study SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID JANAF THERMOCHEMICAL TABLES; IONIZATION-ENERGY; EFFICIENCY SPECTRUM; OZONE DEPLETION; BROMINE DIOXIDE; AB-INITIO; 298 K; RADICALS; OXIDES; IODINE AB The appearance energy of BrO+ from the dissociative ionization of OBrO was determined from the photoionization efficiency spectrum of BrO+ over the wavelength range lambda = 90-122 nm by using a discharge flow-photoionization mass spectrometer apparatus coupled to a vacuum- ultraviolet synchrotron radiation source. Bromine dioxide was generated in a flow tube reactor by first forming BrO via the reaction O(P-3) + Br-2 and then allowing the BrO to react on the cold flow tube wall. Species present in addition to OBrO were BrO, HOBr, Br2O, and residual BT2. The results are perturbed by a signal from BrO+ formed by direct photoionization of BrO and by the dissociative ionization of Br2O. It was possible to correct for these perturbations to obtain a clean appearance energy plot that yielded a threshold at lambda = 98.65 +/- 0.23 nm. This gives AE(298)(BrO+,OBrO) = 12.56(8) +/- 0.02(9) eV. Taking known thermodynamic quantities, this result yields Delta H-f(0)o(OBrO) = 173.4 +/- 4.3 kJ mol(-1) (and Delta H-f(298)o(OBrO) = 163.9 +/- 4.4 kJ mol(-1)). This is the first experimental determination of the heat of formation of OBrO, and the present result is compared with those of previous estimates and recent calculations. In addition, computations (based on results from ab initio calculations) were performed to obtain Delta H-f(0)o(OBrO) = 164 +/- 8 kJ mol(-1), which is in very good agreement with our experimental result. Also, a value for Delta H-f(0)o(OIO) of 174 +/- 25 kJ mol(-1) was estimated from a trend analysis that employed Chase's method (i.e., Delta H-at(0)o(OXO)/D-0(o)(XO)). Additionally, a comparison is made of recent photoelectron spectroscopic and photoionization mass spectrometric determinations of the ionization energies of BrO and OBrO. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. NASA, Goddard Space Flight Ctr, Extraterr Phys Lab, Greenbelt, MD 20771 USA. Natl Inst Stand & Technol, Phys & Chem Properties Div, Gaithersburg, MD 20899 USA. RP Klemm, RB (reprint author), Brookhaven Natl Lab, Bldg 815,POB 5000, Upton, NY 11973 USA. NR 44 TC 13 Z9 13 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 8 PY 2001 VL 105 IS 9 BP 1638 EP 1642 DI 10.1021/jp002397z PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 407JN UT WOS:000167268600030 ER PT J AU Weston, RE AF Weston, RE TI Oxygen isotope effects in the oxidation of methane to carbon monoxide SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID ATMOSPHERIC CHEMISTRY; ALKYL RADICALS; KINETIC DATA; CO; OH; CH3O2; INVERSION; FRACTIONATION; ALKYLPEROXY; (CO)-C-14 AB A significant fraction (estimated to be as large as 30%) of the carbon monoxide in the atmosphere is produced by the oxidation of methane. One of the approaches that has been used to determine this fraction is an inversion of observed carbon and oxygen isotopic abundance ratios, C-13/C-12 and O-18/O-16, together with estimates of the magnitudes of other sources of carbon monoxide, and isotope effects in each source. For this purpose, values of the kinetic isotope effects in the methane oxidation are required, and although these have been determined experimentally for C-13, they have not been measured for O-18. This article examines the kinetic mechanism of methane oxidation and shows that an oxygen isotope effect could take place in the addition reaction of methyl radicals with molecular oxygen to form methylperoxy. Subsequent reactions in the complicated mechanism for methane oxidation do not lead to isotopic fractionation of oxygen. The expected kinetic isotope effect is calculated using variational transition state theory for the dissociation of methylperoxy, and combining the rate coefficient ratio with the ratio of equilibrium constants to obtain the ratio of recombination rate coefficients. The calculated kinetic isotope effects enrich O-18 in the methylperoxy adduct relative to molecular oxygen. The atmospheric implications of this are briefly discussed. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Weston, RE (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 39 TC 8 Z9 8 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 8 PY 2001 VL 105 IS 9 BP 1656 EP 1661 DI 10.1021/jp002019u PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 407JN UT WOS:000167268600033 ER PT J AU Ward, BH Rutel, IB Brooks, JS Schlueter, JA Winter, RW Gard, GL AF Ward, BH Rutel, IB Brooks, JS Schlueter, JA Winter, RW Gard, GL TI Millimeter-wave spectroscopy of the organic spin-Peierls system beta '-(ET)(2)SF5CF2SO3 SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID ELECTRONIC BAND-STRUCTURE; BEDT-TTF; CONDUCTORS; SUPERCONDUCTIVITY; RESONANCE; SALTS; CLO4; EPR; BR AB The first purely organic BEDT-TTF spin--Peierls system, beta'-(ET)(2)SF5CF2SO3, has been confirmed using a high-frequency electron paramagnetic resonance (EPR) cavity perturbation technique. The material exhibits the characteristics of a quasi-one-dimensionai (1D) Heisenberg antiferromagnetic spin system above 30 K, but undergoes a second-order transition, at Tsp = 33 K, to a Singlet ground state, due to a progressive spin-lattice dimerization. The spin--Peierls state is evidenced by a sharp drop in the spin susceptibility below 24 K for the magnetic field (of order 2.5 T) parallel to each of the three principal axes (i.e., H \ \a, H \ \b, and H \ \c). The spin-Peierls distortion based on g value shift analysis appears to be predominately along the crystallographic b axis. The singlet-triplet gap, Delta (sigma)(0) = 114 (+/-21) K, was determined using a modified BCS theory. Also, we describe in some detail the millimeter-wave vector network analyzer (MVNA) for researchers who have interest in precision EPR measurements at magnetic fields and corresponding resonance frequencies higher than conventional X-band measurements. C1 Florida State Univ, NHMFL, Tallahassee, FL 32310 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Portland State Univ, Dept Chem, Portland, OR 97207 USA. RP Brooks, JS (reprint author), Florida State Univ, NHMFL, Tallahassee, FL 32310 USA. NR 24 TC 4 Z9 4 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 8 PY 2001 VL 105 IS 9 BP 1750 EP 1755 DI 10.1021/jp002993t PG 6 WC Chemistry, Physical SC Chemistry GA 407JF UT WOS:000167267900013 ER PT J AU Stern, LA Circone, S Kirby, SH Durham, WB AF Stern, LA Circone, S Kirby, SH Durham, WB TI Anomalous preservation of pure methane hydrate at 1 atm SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID GAS-HYDRATE; CLATHRATE HYDRATE; SUPERHEATED ICE; DISSOCIATION AB Direct measurement of decomposition rates of pure, polycrystalline methane hydrate reveals a thermal regime where methane hydrate metastably "preserves" in bulk by as much as 75 K above its nominal equilibrium temperature (193 K at 1 atm). Rapid release of the sample pore pressure at isothermal conditions between 242 and 271 K preserves up to 93% of the hydrate for at least 24 h, reflecting the greatly suppressed rates of dissociation that characterize this regime. Subsequent warming through the H(2)O ice point then induces rapid and complete dissociation, allowing controlled recovery of the total expected gas yield. This behavior is in marked contrast to that exhibited by methane hydrate at both colder (193-240 K) and warmer (272-290 K) test conditions, where dissociation rates increase monotonically with increasing temperature. Anomalous preservation has potential application for successful retrieval of natural gas hydrate or hydrate-bearing sediments from remote settings, as well as for temporary low-pressure transport and storage of natural gas. C1 US Geol Survey, Menlo Pk, CA 94025 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Stern, LA (reprint author), US Geol Survey, 345 Middlefield Rd,MS-977, Menlo Pk, CA 94025 USA. EM lstern@usgs.gov; scircone@usgs.gov; skirby@usgs.gov; durham1@llnl.gov NR 22 TC 202 Z9 216 U1 8 U2 53 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 8 PY 2001 VL 105 IS 9 BP 1756 EP 1762 DI 10.1021/jp003061s PG 7 WC Chemistry, Physical SC Chemistry GA 407JF UT WOS:000167267900014 ER PT J AU Agarwal, R Yang, M Xu, QH Fleming, GR AF Agarwal, R Yang, M Xu, QH Fleming, GR TI Three pulse photon echo peak shift study of the B800 band of the LH2 complex of Rps. acidophila at room temperature: A coupled master equation and nonlinear optical response function approach SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID LIGHT-HARVESTING COMPLEX; PHOTOSYNTHETIC ANTENNA COMPLEXES; FEMTOSECOND ENERGY-TRANSFER; PUMP-PROBE SPECTROSCOPY; PIGMENT-PROTEIN COMPLEXES; RHODOBACTER-SPHAEROIDES; RHODOPSEUDOMONAS-ACIDOPHILA; PURPLE BACTERIA; TRANSFER DYNAMICS; B820 SUBUNIT AB Three pulse photon echo peak shift (3PEPS) data were obtained for the B800 band of Rps, acidophila (strain 10050) at room temperature. The peak shift decays on two time scales: a sub 100 fs decay owing to the ultrafast solvation by the protein bath and a 500-600 fs decay to a value of 2.5 fs at 1.2 ps. Here we present a novel method that properly incorporates the effect of energy transfer on the nonlinear response functions to simulate the peak shift for weakly coupled, multi-chromophoric energy transfer systems. The method involves calculation of third-order response functions for energy transfer systems to account for the interaction of the laser pulses with the chromophores, whereas the energy transfer kinetics is incorporated by solving the master equation for the whole ring of B800 pigments. The effect of disorder on spectral overlaps is taken into account by a Monte Carlo sampling procedure that selects transition frequencies from a Gaussian distribution of site energies. The peak shift is then calculated by combining ensemble-averaged population kinetics with the appropriate response functions. We estimate the energy transfer time within the B800 band to be similar to 500-600 fs, acid the experiments are well described by Forster theory level calculations including energy disorder. By simultaneously modeling the peak shift data and the linear absorption spectrum, we suggest the presence of two levels of disorder (i.e., partially correlated disorder) in the B800 band. Strong beats are also found in our data with a frequency of 165 cm(-1). C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Fleming, GR (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Xu, Qing-Hua/B-1478-2013; OI Xu, Qing-Hua/0000-0002-4153-0767; Yang, Mino/0000-0001-9504-0280 NR 58 TC 50 Z9 51 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 8 PY 2001 VL 105 IS 9 BP 1887 EP 1894 DI 10.1021/jp0031146 PG 8 WC Chemistry, Physical SC Chemistry GA 407JF UT WOS:000167267900032 ER PT J AU Laskin, J Denisov, E Futrell, J AF Laskin, J Denisov, E Futrell, J TI Comparative study of collision-induced and surface-induced dissociation. 2. Fragmentation of small alanine-containing peptides in FT-ICR MS SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID MASS-SPECTROMETRY; PROTONATED PEPTIDES; GAS-PHASE; EFFICIENCY; ACTIVATION AB Multiple-collision activation (MCA-CID) and surface-induced dissociation (SID) of protonated trialanine, (AAA)H+; tetraalanine, (AAAA)H+, pentaalanine. (AAAAA)H+; and prolyltetraalanine, (PAAAA)H+ were studied using a 7 T Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). Fragmentation efficiency curves obtained using both techniques were compared by converting the SID collision energy into an "effective' center-of-mass frame using an arbitrary neutral partner of mass, M-N. The best overlap between the SID and MCA-CID fragmentation efficiency curves was obtained using very similar values of M-N for all the peptides, indicating that all the protonated precursor ions were undergoing similar interaction with terminal chemical groups on the fluorinated self-assembled monolayer (SAM) surface. Collision energy resolved fragmentation efficiency curves obtained using both methods are very similar, and both methods of collisional activation result in a quasi-thermal population of ion internal energies. We suggest that normal-incidence ion-surface collisions with self-assembled monolayer surface involve interactions of the projectile ion with chemical groups on the surface with efficient transfer of impact energy into the surface and into the internal energy of the ion. This mechanism, except for time frame for the activation process, is analogous to the sequential gas phase collisional activation of these model peptides. C1 Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Laskin, J (reprint author), Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, POB 999,K8-96, Richland, WA 99352 USA. RI Laskin, Julia/H-9974-2012 OI Laskin, Julia/0000-0002-4533-9644 NR 17 TC 67 Z9 68 U1 2 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 8 PY 2001 VL 105 IS 9 BP 1895 EP 1900 DI 10.1021/jp004153k PG 6 WC Chemistry, Physical SC Chemistry GA 407JF UT WOS:000167267900033 ER PT J AU Lee, CL Al-Salem, MF Woehrle, TG AF Lee, CL Al-Salem, MF Woehrle, TG TI Natural frequency measurements for rotating spanwise uniform cantilever beams SO JOURNAL OF SOUND AND VIBRATION LA English DT Letter C1 Univ Calif Lawrence Livermore Natl Lab, Struct Mech Grp, Livermore, CA 94551 USA. RP Lee, CL (reprint author), Univ Calif Lawrence Livermore Natl Lab, Struct Mech Grp, POB 808, Livermore, CA 94551 USA. NR 3 TC 9 Z9 11 U1 0 U2 3 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD MAR 8 PY 2001 VL 240 IS 5 BP 957 EP 961 DI 10.1006/jsvi.2000.3204 PG 5 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA 411PP UT WOS:000167508700011 ER PT J AU Chow, ML Moler, EJ Mian, IS AF Chow, ML Moler, EJ Mian, IS TI Identifying marker genes in transcription profiling data using a mixture of feature relevance experts SO PHYSIOLOGICAL GENOMICS LA English DT Article DE marker genes; mixture of experts; support vector machines; adipsin; cystatin C; azurocidin ID SELF-ORGANIZING MAPS; EXPRESSION DATA; PATTERNS; DIFFERENTIATION; SELENOPROTEINS AB Transcription profiling experiments permit the expression levels of many genes to be measured simultaneously. Given profiling data from two types of samples, genes that most distinguish the samples (marker genes) are good candidates for subsequent in-depth experimental studies and developing decision support systems for diagnosis, prognosis, and monitoring. This work proposes a mixture of feature relevance experts as a method for identifying marker genes and illustrates the idea using published data from samples labeled as acute lymphoblastic and myeloid leukemia (ALL, AML). A feature relevance expert implements an algorithm that calculates how well a gene distinguishes samples, reorders genes according to this relevance measure, and uses a supervised learning method [here, support vector machines (SVMs)] to determine the generalization performances of different nested gene subsets. The mixture of three feature relevance experts examined implement two existing and one novel feature relevance measures. For each expert, a gene subset consisting of the top 50 genes distinguished ALL from AML samples as completely as all 7,070 genes. The 125 genes at the union of the top 50s are plausible markers for a prototype decision support system. Chromosomal aberration and other data support the prediction that the three genes at the intersection of the top 50s, cystatin C, azurocidin, and adipsin, are good targets for investigating the basic biology of ALL/AML. The same data were employed to identify markers that distinguish samples based on their labels of T cell/B cell, peripheral blood/bone marrow, and male/female. Selenoprotein W may discriminate T cells from B cells. Results from analysis of transcription profiling data from tumor/nontumor colon adenocarcinoma samples support the general utility of the aforementioned approach. Theoretical issues such as choosing SVM kernels and their parameters, training and evaluating feature relevance experts, and the impact of potentially mislabeled samples on marker identification (feature selection) are discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Cell & Mol Biol, Div Life Sci,Radiat Biol & Environm Toxicol Grp, Berkeley, CA 94720 USA. Chiron Corp, Emeryville, CA 94608 USA. Gene Log Inc, Berkeley, CA 94704 USA. RP Mian, IS (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Cell & Mol Biol, Div Life Sci,Radiat Biol & Environm Toxicol Grp, MS 74-197,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 24 TC 65 Z9 67 U1 0 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 1094-8341 J9 PHYSIOL GENOMICS JI Physiol. Genomics PD MAR 8 PY 2001 VL 5 IS 2 BP 99 EP 111 PG 13 WC Cell Biology; Genetics & Heredity; Physiology SC Cell Biology; Genetics & Heredity; Physiology GA 409AT UT WOS:000167362900006 PM 11242594 ER PT J AU Kwon, YK Androsch, R Pyda, M Wunderlich, B AF Kwon, YK Androsch, R Pyda, M Wunderlich, B TI Multi-frequency sawtooth modulation of a power-compensation differential scanning calorimeter SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 27th North-American-Thermal-Analysis-Society Conference CY SEP 20-22, 1999 CL SAVANNAH, GEORGIA SP N Amer Thermal Anal Soc DE heat capacity; temperature-modulated differential scanning calorimetry; TMDSC; Fourier transformation; higher harmonics; sawtooth modulation ID HEAT-CAPACITY; THERMODYNAMIC PROPERTIES; TEMPERATURE; DSC AB In this paper experiments with temperature-modulated differential scanning calorimetry (TMDSC) are described in which the modulation consists of multiple, superimposed frequencies. The harmonics of the Fourier series of the measured heat-how rate and temperature are deconvoluted to extract data pertaining to the different frequencies. In order to derive 1st, 3rd, 5th, and 7th harmonics of similar amplitudes, a complex, but simple-to-program sawtooth is generated. In TMDSC with sawtooth modulation with a period of less than about 150 s, a correction by extrapolation to zero frequency is necessary. It is shown that the extrapolation of the heat capacity calculated from the amplitudes of the first and higher harmonics of the Fourier-transforms of heat-flow rate and the sample temperature permits this evaluation of the hear capacity from a single experiment. The method is tested on a power-compensation type TMDSC with temperature control close to the calorimeter heater. The time constant for the response of the calorimeters is less than 30 s (tau < 5 s rad(-1)). Instabilities of the calorimeter response are removed by smoothing. Published by Elsevier Science B.V. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Wunderlich, B (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 13 TC 12 Z9 12 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD MAR 8 PY 2001 VL 367 BP 203 EP 215 DI 10.1016/S0040-6031(00)00695-X PG 13 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 414FU UT WOS:000167656100028 ER PT J AU Pyda, M Kwon, YK Wunderlich, B AF Pyda, M Kwon, YK Wunderlich, B TI Heat capacity measurement by sawtooth modulated standard heat-flux differential scanning calorimetry with sample temperature control SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 27th North-American-Thermal-Analysis-Society Conference CY SEP 20-22, 1999 CL SAVANNAH, GEORGIA SP N Amer Thermal Anal Soc DE heat capacity; temperature-modulated differential scanning calorimetry; TMDSC; Fourier transformation; higher harmonics; sawtooth modulation ID DSC AB The frequency dependence of the apparent heat capacity is analyzed when measuring with a heat-flux type, standard differential scanning calorimetry (DSC), controlled at the sample. A specially constructed, centrosymmetric sawtooth modulation composed of 14 heating and cooling segments was used for the measurements. This complex sawtooth produces four harmonics of the order nu = 1,3,5 and 7 with close to equal amplitudes in the Fourier representation. A single measurement should thus be sufficient for the evaluation of the frequency dependence of the measured, apparent heat capacity from the amplitudes of the Fourier series of the differential heat-how rate (A(HF)) and the sample temperature (A(Ts)). The frequency independent heat capacity can, however, not be represented by the expression: C-p = A(HF)/(A(Ts)nu omega)[1 + (tau nu omega)(2)](0.5) with a fixed tau, as is possible with a sinusoidal modulation which keeps the DSC in steady state, but tau depends on sample and reference properties, as well instrument parameters such as pan masses and thermal contacts, and may also be influenced by the design of the control and analysis software. Published by Elsevier Science B.V. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Wunderlich, B (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 12 TC 12 Z9 12 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD MAR 8 PY 2001 VL 367 BP 217 EP 227 DI 10.1016/S0040-6031(00)00697-3 PG 11 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 414FU UT WOS:000167656100029 ER PT J AU Pak, J Wunderlich, B AF Pak, J Wunderlich, B TI Heat capacity by sawtooth-modulated, standard heat-flux differential scanning calorimeter with close control of the heater temperature SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 27th North-American-Thermal-Analysis-Society Conference CY SEP 20-22, 1999 CL SAVANNAH, GEORGIA SP N Amer Thermal Anal Soc DE sawtooth-modulated DSC; poly(methyl methacrylate); glass transition; heat capacity ID GLASS-TRANSITION REGION; DSC AB Heat capacities are determined for the different frequencies generated as higher harmonics of the Fourier-transform of the hear-flow rate and sample temperature with quasi-isothermal, temperature-modulated differential scanning calorimetry (TMDSC), A complex sawtooth modulation was created using a TMDSC of the heat-Aux type, controlled close to the heater. The complex sawtooth is designed to yield four harmonics of similar amplitudes. This new modulation method permits the determination of heat capacity with assurance of identical thermal history and sample geometry. which are important for the study of non-equilibrium processes as they exist, for example, in the glass transition region. Using a proper calibration by plotting the frequency dependence of the calorimeter response, heat capacities are determined approaching a 0.1% standard deviation for polymers. Best results were found for modulation with a complex sawtooth of 14 segments with a maximum amplitude of 1.0 K, a period of 420 s for 9-30 mg of polymer sample. and a sampling interval of one point per second. Published by Elsevier Science B.V. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Wunderlich, B (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 17 TC 14 Z9 14 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD MAR 8 PY 2001 VL 367 BP 229 EP 238 DI 10.1016/S0040-6031(00)00693-6 PG 10 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 414FU UT WOS:000167656100030 ER PT J AU Anderson, PM Guilloton, MB Wronski, J Joachimiak, A Walsh, MA AF Anderson, PM Guilloton, MB Wronski, J Joachimiak, A Walsh, MA TI The active site of cyanase SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Minnesota, Duluth, MN 55812 USA. Argonne Natl Lab, Argonne, IL 60439 USA. IRBM, Rome, Italy. NR 0 TC 0 Z9 0 U1 1 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A188 EP A188 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438101069 ER PT J AU Bewley, M Barber, M AF Bewley, M Barber, M TI Crystal structure of the FAD domain of spinach nitrate reductase at 2.4 angstrom resolution. SO FASEB JOURNAL LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. Univ S Florida, Dept Biochem & Mol Biol, Tampa, FL 33612 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A525 EP A525 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438103004 ER PT J AU Chin, RY Holtom, G Thrall, B Colson, S Choi, A Risby, TH AF Chin, RY Holtom, G Thrall, B Colson, S Choi, A Risby, TH TI Using coherent anti-stokes Raman spectroscopy (CARS) to determine environmental particulate matter (EPM) induced macrophage (m theta) injury. SO FASEB JOURNAL LA English DT Meeting Abstract C1 Johns Hopkins Univ, Baltimore, MD 21205 USA. Pacific NW Natl Lab, Richland, WA USA. Univ Pittsburgh, Pittsburgh, PA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A170 EP A170 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438100965 ER PT J AU Dingley, KH Turtletaub, KW Vogel, JS White, RWD Abel, S Ebeler, SE Mitchell, AE Steinberg, FM Clifford, AJ AF Dingley, KH Turtletaub, KW Vogel, JS White, RWD Abel, S Ebeler, SE Mitchell, AE Steinberg, FM Clifford, AJ TI Effects of dietary supplements with chemopreventive potential on metabolism and DNA-adduct formation of the heterocyclic amine PhIP in rats SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Calif Davis, Davis, CA 95616 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A618 EP A618 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438103542 ER PT J AU Dunn, BM Beyer, BB Li, M Gustchina, A Dauter, Z Oda, K Wlodawer, A AF Dunn, BM Beyer, BB Li, M Gustchina, A Dauter, Z Oda, K Wlodawer, A TI Structure and substrate specificity of PSCP, a novel serine-carboxyl peptidase from Pseudomonas SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Florida, Gainesville, FL 32610 USA. NCI, Program Struct Biol, Frederick, MD 21702 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Kyoto Inst Technol, Sakyo Ku, Kyoto 6068585, Japan. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A23 EP A23 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438100125 ER PT J AU Goldowitz, D AF Goldowitz, D CA Tennessee Mouse Genome Consortium TI Regional mutagenesis of the mouse genome and neural phenotypes. SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Tennessee, Knoxville, TN 37996 USA. Univ Memphis, Memphis, TN 38152 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. Vanderbilt Univ, Nashville, TN USA. St Jude Childrens Res Hosp, Memphis, TN 38105 USA. Meharry Med Coll, Nashville, TN 37208 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A65 EP A65 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438100365 ER PT J AU Lemke, SL Follett, JR Dueker, SR Lin, YM Hickenbottom, SJ Buchholz, BA Vogel, JS Clifford, AJ AF Lemke, SL Follett, JR Dueker, SR Lin, YM Hickenbottom, SJ Buchholz, BA Vogel, JS Clifford, AJ TI Urinary metabolites of orally administered beta-carotene in humans using C-14-accelerator mass spectrometry SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Davis, Davis, CA 95616 USA. Lawrence Livermore Natl Labs, Livermore, CA USA. RI Buchholz, Bruce/G-1356-2011 NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A297 EP A297 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438101698 ER PT J AU Lin, YM Buchholz, BA Rogers, LM Vogel, JS Clifford, AJ AF Lin, YM Buchholz, BA Rogers, LM Vogel, JS Clifford, AJ TI Determining the long-term kinetic behavior of leucine metabolism using C-14-accelerator mass spectrometry SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RI Buchholz, Bruce/G-1356-2011 NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A266 EP A266 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438101515 ER PT J AU Marohnic, CC Bewley, MC Barber, MJ AF Marohnic, CC Bewley, MC Barber, MJ TI Lysine 110 is important for diaphorase activity in cytochrome b(5) reductase. SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ S Florida, Tampa, FL 33612 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A525 EP A525 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438103002 ER PT J AU Pirkle, LE Bowen, BMH Sowell, A Schleicher, R Chen, HP Xu, M Caudill, S AF Pirkle, LE Bowen, BMH Sowell, A Schleicher, R Chen, HP Xu, M Caudill, S TI Comparison of results from HPLC and Futterman assay serum retinol concentration determination methods on samples from hospitalized children SO FASEB JOURNAL LA English DT Meeting Abstract C1 Ctr Dis Control & Prevent, ORISE, Atlanta, GA 30341 USA. Ctr Dis Control & Prevent, Atlanta, GA 30341 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A603 EP A603 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438103455 ER PT J AU Pollycove, M Feinendegen, LE AF Pollycove, M Feinendegen, LE TI Immunotherapy of metastatic prostate cancer with low-dose total body irradiation (LDR) SO FASEB JOURNAL LA English DT Meeting Abstract C1 US Nucl Regulatory Commiss, Rockville, MD 20852 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 7 PY 2001 VL 15 IS 4 BP A240 EP A240 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 410KA UT WOS:000167438101374 ER EF