FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Lee, SHD Eggerstedt, P Zievers, JF AF Lee, SHD Eggerstedt, P Zievers, JF TI Preliminary evaluation of the FIBROSIC candle filter for particulate control in PFBC SO JOURNAL OF THE INSTITUTE OF ENERGY LA English DT Article AB The FIBROSIC(TM) candle filter element is made by the vacuum-forming of a select blend of alumine-silicate fibres with silica and alumina binders. It is potentially useful as a hot-gas clean-up device for control of particulates in pressurised fluidised-bed combustion (PFBC). Relative to the more widely studied SiC candle filter, it has the advantages of light weight, low cost and reduced tendency to thermal-shock breakage. With Illinois No.6 high-sulphur coal in a laboratory-scale PFBC/alkali sorber facility, filters of both types were tested for particulate-collection efficiency; permeability characteristics; and physical and mechanical strength and integrity. Tests were conducted at 800-825 degrees C with a system pressure of 9.2 bar. Filter-face velocities were 5.1 and 10.2 cm s(-1) during test periods of 8 and 9.5 hours for SiC and FIBROSIC candle filters respectively. The filters were periodically cleaned by a reverse jet pulse of nitrogen gas. Both types achieved particulate-collection efficiencies of >99.9% and exhibited comparable permeability characteristics. Although the FIBROSIC candle filter possesses inherently lower bursting strength than the SIG, its physical and mechanical strengths were shown to be sufficient under PFBC conditions. RP Lee, SHD (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU INST ENERGY PI LONDON PA 18 DEVONSHIRE ST PORTLAND PLACE, LONDON, ENGLAND W1N 2AU SN 0144-2600 J9 J I ENERGY JI J. Inst. Energy PD JUN PY 1996 VL 69 IS 479 BP 87 EP 95 PG 9 WC Energy & Fuels SC Energy & Fuels GA UW337 UT WOS:A1996UW33700005 ER PT J AU Mycek, MA Bigot, JY Perakis, IE Chemla, DS AF Mycek, MA Bigot, JY Perakis, IE Chemla, DS TI Measuring the ultrafast dynamics of Coulomb correlation effects: Dephasing in nonequilibrium Fermi seas SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID RAY-EDGE PROBLEM; QUANTUM WELLS; SEMICONDUCTORS; CARRIER; SINGULARITIES; SPECTRA; PULSES; LIGHT AB We measure the dynamics of the quantum phase coherence of the wave function describing interacting electrons and holes optically excited into the continuum of a GaAs/AlGaAs quantum well. We achieve this by spectrally resolving both the transient four-wave mixing signal and the differential transmission signal arising from such interacting carriers. We observe a dynamical blue shift of the coherent four-wave mixing emission spectrum with respect to the excitation laser pulse and interpret this as a direct manifestation of the dynamic Coulomb correlation effects in this many-body system. (C) 1996 Optical Society of America. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235. RP Mycek, MA (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,1 CYCLOTRON RD MS 2-300,BERKELEY,CA 94720, USA. RI Perakis, Ilias/G-9186-2011 NR 24 TC 10 Z9 10 U1 1 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD JUN PY 1996 VL 13 IS 6 BP 1284 EP 1290 DI 10.1364/JOSAB.13.001284 PG 7 WC Optics SC Optics GA UP796 UT WOS:A1996UP79600025 ER PT J AU Perakis, IE Brener, I Knox, WH Chemla, DS AF Perakis, IE Brener, I Knox, WH Chemla, DS TI Nonlinear optical study of the Fermi edge singularity: Differences from atomic excitons in the virtual excitation regime SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID NONCANONICAL-TRANSFORMATION APPROACH; RAY-ABSORPTION PROBLEM; GOLDEN-RULE APPROACH; QUANTUM WELLS; ELECTRON CORRELATIONS; SPECTRA; SEMICONDUCTORS; FEMTOSECOND; SYSTEM; FORMALISM AB We discuss how the different nature of excitonic effects in modulation-doped quantum wells or metals (Fermi edge singularity) and undoped semiconductors (atomic excitons) manifests itself strongly in the nonlinear absorption spectrum for off-resonant pump excitation. We study this problem by extending our previous theoretical study of the Fermi edge singularity in linear absorption and obtain a new intuitive picture that extracts the physics conveyed by our experimental results. We point out that, in addition to phase-space filling, the pump-induced polarization increases the carrier effective masses and, as a result, can enhance excitonic resonances. (C) 1996 Optical Society of America C1 AT&T BELL LABS,HOLMDEL,NJ 07733. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP Perakis, IE (reprint author), VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235, USA. RI Brener, Igal/G-1070-2010; Perakis, Ilias/G-9186-2011 OI Brener, Igal/0000-0002-2139-5182; NR 58 TC 20 Z9 20 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD JUN PY 1996 VL 13 IS 6 BP 1313 EP 1325 DI 10.1364/JOSAB.13.001313 PG 13 WC Optics SC Optics GA UP796 UT WOS:A1996UP79600030 ER PT J AU Sordelet, DJ Besser, MF Anderson, IE AF Sordelet, DJ Besser, MF Anderson, IE TI Particle size effects on chemistry and structure of Al-Cu-Fe quasicrystalline coatings SO JOURNAL OF THERMAL SPRAY TECHNOLOGY LA English DT Article DE Al-Cu-Fe coatings; coating chemistry; coating microstructure; particle size effects; quasicrystal ID CRYSTAL; LATTICE; ALLOYS; PHASE AB Gas atomized Al63Cu25Fe12 powders of varying size fractions were plasma sprayed onto hot (similar to 600 degrees C) and cool (similar to 25 degrees C) substrates using Mach I and subsonic plasma gun configurations, The chemical composition and phase contents of coatings were determined, Furthermore, coatings were annealed in vacuum at 700 degrees C for 2 h to observe phase changes, It was found that finer particles (e.g., <25 mu m) tend to vaporize Al during spraying, which shifts the coating composition away from the quasicrystalline (psi) single-phase region in the Al-Cu-Fe phase diagram, Coatings deposited on hot substrates were denser, richer in the psi phase, and harder than the corresponding coatings deposited onto cool substrates. C1 US DOE,AMES LAB,AMES,IA 50011. NR 34 TC 33 Z9 35 U1 0 U2 3 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9630 J9 J THERM SPRAY TECHN JI J. Therm. Spray Technol. PD JUN PY 1996 VL 5 IS 2 BP 161 EP 174 DI 10.1007/BF02646430 PG 14 WC Materials Science, Coatings & Films SC Materials Science GA UQ369 UT WOS:A1996UQ36900020 ER PT J AU Freimuth, P AF Freimuth, P TI A human cell line selected for resistance to adenovirus infection has reduced levels of the virus receptor SO JOURNAL OF VIROLOGY LA English DT Article ID HELA-CELLS; PERSISTENT INFECTION; LYMPHOID-CELLS; EARLY EVENTS; INTEGRINS; ADHESION; TYPE-5; INTERNALIZATION; ATTACHMENT; RELEASE AB To investigate determinants of host cell susceptibility to infection, cells partially resistant to infection were selected from the rare cells which remained adherent after infection of a culture of A549 cells with Ad2RAE, a mutant of adenovirus type 2 whose vertex capsomers lack an Arg-Gly-Asp (RGD) sequence which mediates binding of wild-type virus to integrins. Integrins promote the internalization of attached virions, whereas adsorption itself results from binding of the viral fibers to an unidentified cellular receptor, Following three rounds of selection, a persistently infected culture was established in which virus replication was detected in approximately 5% of the cells, Uninfected cells were readily cloned from the culture, indicating that at any particular time the majority of cells in the culture were uninfected, The resistance of one clone of uninfected cells to infection was correlated with a 10-fold reduction in the concentration of fiber receptors on these cells compared with the parental A549 cell line, indicating that efficiency of virus adsorption depends on the receptor concentration, Surprisingly, the rate at which host cells internalized RGD-negative virus also was strongly dependent on the fiber receptor concentration. While internalization of wild-type virus is promoted by the binding of integrins to the penton base RGD sequence, these results suggest that virus also can enter cells by an alternate pathway which requires binding of virions to multiple fiber receptors. RP Freimuth, P (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 32 TC 59 Z9 59 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD JUN PY 1996 VL 70 IS 6 BP 4081 EP 4085 PG 5 WC Virology SC Virology GA UL104 UT WOS:A1996UL10400085 PM 8648746 ER PT J AU Shine, R Seigel, RA AF Shine, R Seigel, RA TI A neglected life-history trait: Clutch-size variance in snakes SO JOURNAL OF ZOOLOGY LA English DT Article ID REPRODUCTIVE CHARACTERISTICS; DEVELOPMENTAL PLASTICITY; LIZARD REPRODUCTION; BOMBINA-ORIENTALIS; NATURAL-SELECTION; CROTALUS-VIRIDIS; PROPAGULE SIZE; BODY SIZE; EGG SIZE; RATTLESNAKE AB Most analyses of life-history traits have focused on mean values rather than their associated variances. We review published and original data on snakes, including records gathered over many years on single populations, to examine patterns in clutch-size variability in these animals. Within single populations, the coefficient of variation of clutch size did not vary significantly with maternal body size, or among years. The stability of clutch-size variance through time is consistent with experimental studies showing no significant influence of food intake rates on this characteristic. Clutch-size variances did not differ between viviparous and oviparous snakes, but were dependent upon allometric relationships involving maternal body size and the relationship between clutch size and body size. Clutch-size variability was highest in species with relatively variable female sizes, and with a high rate of increase in clutch size with increasing body size. These two factors acted to magnify the extent of clutch-size variability engendered by variability in maternal body sizes. The relationships among these variables were similar in the two squamate Suborders, but the larger body sizes and mean clutch sizes of snakes resulted in clutch-size variances being higher in snakes than in lizards. C1 SE LOUISIANA UNIV, DEPT BIOL SCI, HAMMOND, LA 70402 USA. SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. RP Shine, R (reprint author), UNIV SYDNEY, SCH BIOL SCI A08, SYDNEY, NSW 2006, AUSTRALIA. RI Shine, Richard/B-8711-2008 NR 80 TC 13 Z9 17 U1 1 U2 7 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0952-8369 EI 1469-7998 J9 J ZOOL JI J. Zool. PD JUN PY 1996 VL 239 BP 209 EP 223 PN 2 PG 15 WC Zoology SC Zoology GA VB043 UT WOS:A1996VB04300001 ER PT J AU ONeill, RV Hunsaker, CT Timmins, SP Jackson, BL Jones, KB Riitters, KH Wickham, JD AF ONeill, RV Hunsaker, CT Timmins, SP Jackson, BL Jones, KB Riitters, KH Wickham, JD TI Scale problems in reporting landscape pattern at the regional scale SO LANDSCAPE ECOLOGY LA English DT Article DE grain; extent; index ID CONTERMINOUS UNITED-STATES; COEXISTENCE; ENVIRONMENT; COMPETITION; DISTURBANCE; DYNAMICS AB Remotely sensed data for Southeastern United States (Standard Federal Region 4) are used to examine the scale problems involved in reporting landscape pattern for a large, heterogeneous region. Frequency distributions of landscape indices illustrate problems associated with the grain or resolution of the data. Grain should be 2 to 5 times smaller than the spatial features of interest. The analyses also reveal that the indices are sensitive to the calculation scale, i.e., the unit area or extent over which the index is computed. This ''sample area'' must be 2 to 5 times larger than landscape patches to avoid bias in calculating the indices. RP ONeill, RV (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37830, USA. NR 30 TC 167 Z9 195 U1 3 U2 34 PU SPB ACADEMIC PUBLISHING BV PI AMSTERDAM PA PO BOX 11188, NL-1001 GD AMSTERDAM, NETHERLANDS SN 0921-2973 J9 LANDSCAPE ECOL JI Landsc. Ecol. PD JUN PY 1996 VL 11 IS 3 BP 169 EP 180 DI 10.1007/BF02447515 PG 12 WC Ecology; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA UX478 UT WOS:A1996UX47800004 ER PT J AU Kulp, TJ McRae, T AF Kulp, TJ McRae, T TI Active infrared imagers visualize gas leaks SO LASER FOCUS WORLD LA English DT Article AB As a method of leak detection, laser-based gas-plume imaging provides real-time spatial distribution enabling immediate location of the source. C1 Sandia Natl Labs, Livermore, CA 94551 USA. Laser Imaging Syst, Punta Gorda, FL USA. RP Kulp, TJ (reprint author), Sandia Natl Labs, Livermore, CA 94551 USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU PENNWELL PUBL CO PI NASHUA PA 98 SPIT BROOK RD, NASHUA, NH 03062-2801 USA SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD JUN PY 1996 VL 32 IS 6 BP 211 EP + PG 6 WC Optics SC Optics GA V2888 UT WOS:000168852000043 ER PT J AU Adams, SM Jaworska, JS Ham, KD AF Adams, SM Jaworska, JS Ham, KD TI Influence of ecological factors on the relationship between MFO induction and fish growth: Bridging the gap using neural networks SO MARINE ENVIRONMENTAL RESEARCH LA English DT Article; Proceedings Paper CT 8th International Symposium on Pollutant Responses in Marine Organisms (PRIMO 9) CY APR 02-05, 1995 CL PACIFIC GROVE, CA SP Univ Calif Davis, US EPA, Ctr Ecol Hlth Res, Univ Calif Davis, Superfund Basic Sci Res Program, NOAA, Natl Marine Fisheries Serv, NW Fisheries Sci Ctr, State Calif Fish & Gam Off Oil Spill Prevent & Response, Vet Serv, US Natl Inst Environm Hlth Sci, Monterey Bay Aquarium, Calif Sea Grant Program ID MONOOXYGENASE; AROCLOR-1254 AB Relationships between molecular and biochemical effects of contaminant exposure and organism-level effects are difficult to establish primarily because. (1) the large differences in time-scales of the responses; (2) the complexity of mechanisms involved in such relationships; and (3) the influence of ecological factors on the expression of higher-level responses to stress. In this study we investigated the relationship between mixed function oxidase (MFO) induction and growth in fish as influenced by principal ecological factors in the environment, such as habitat quality, competition and food availability. Because of the complexity and non-linearity of interactions among these factors, we applied a back-propagation neural network approach to investigate this relationship. Inputs into the network included an indicator of contaminant exposure (7-ethoxyresorufin O-deethylase, EROD) and several ecological variables, while growth rate served as the single output variable. Under. the field conditions and contaminant exposure regimes observed in this study, EROD in the model simulation contributed minimal marginal ability to predict growth. Indirect effects of contaminants on growth could occur, however, through influences on food chain processes or behavioral dynamics of fish populations. Copyright (C) 1996 Elsevier Science Ltd. RP Adams, SM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0141-1136 J9 MAR ENVIRON RES JI Mar. Environ. Res. PD JUN-OCT PY 1996 VL 42 IS 1-4 BP 197 EP 201 DI 10.1016/0141-1136(95)00067-4 PG 5 WC Environmental Sciences; Marine & Freshwater Biology; Toxicology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Toxicology GA UU369 UT WOS:A1996UU36900032 ER PT J AU Hoke, DA Meyers, MA AF Hoke, DA Meyers, MA TI An equation describing the consolidation of combustion synthesized titanium diboride SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article DE titanium diboride; combustion synthesis; phenomenological equations ID DYNAMIC COMPACTION; PLASTICITY THEORY; POROUS MATERIALS; CARBIDE; DEFORMATION AB A phenomenological equation, incorporating the temperature dependence of flow stress, is described for the in-situ consolidation of combustion synthesized materials. An activation energy for the temperature dependent flow stress is calculated and indicates that, in addition to plastic deformation, other processes such as fracture and liquid-phase-assisted particle rearrangement occur. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP Hoke, DA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. RI Meyers, Marc/A-2970-2016 OI Meyers, Marc/0000-0003-1698-5396 NR 28 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JUN PY 1996 VL 39 IS 2 BP 107 EP 110 DI 10.1016/0921-5107(95)01534-5 PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA UU598 UT WOS:A1996UU59800006 ER PT J AU Elata, D Dvorkin, J AF Elata, D Dvorkin, J TI Pressure sensitivity of cemented granular materials SO MECHANICS OF MATERIALS LA English DT Article DE granular material; cementation; contact mechanics; nonlinear elastic AB In this paper, we explore the mechanical contact interaction of two identical elastic spheres uniformly coated with thin layers of a different elastic material, These two coating layers intersect over a finite contact area thus bonding the spheres. The normal contact stiffness and the shear contact stiffness increase when the spheres are axially pressed together, due to the increasing contact area. The dependence of these stiffnesses on the axial load is calculated by using a new approximate analytical solution, The solution also gives the distributions of the normal and shear stress components on the cemented contact. We use this solution to calculate the pressure dependence of the effective elastic moduli of a random pack of identical cemented spheres, This pressure dependence may be large if the initial contact radius is small, It is insignificant for large contact radii, If the spheres are in direct contact and the initial contact radius is small, the elastic properties of the cement have little effect on the pack's elastic moduli. However, if the spheres are separated by even a small cemented gap, the elastic properties of the cement may have a considerable effect on the pack's elastic moduli. C1 STANFORD UNIV,DEPT GEOPHYS,STANFORD,CA 94305. RP Elata, D (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV EARTH SCI,POB 808,LIVERMORE,CA 94551, USA. OI Elata, David/0000-0002-3816-6669 NR 11 TC 16 Z9 16 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 J9 MECH MATER JI Mech. Mater. PD JUN PY 1996 VL 23 IS 2 BP 147 EP 154 DI 10.1016/0167-6636(96)00005-1 PG 8 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA VA640 UT WOS:A1996VA64000004 ER PT J AU Westwood, ARC AF Westwood, ARC TI Materials and society - Impacts and responsibilities SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Editorial Material AB The needs of today's advanced societies have moved well beyond the requirements for food and shelter, etc., and now are focused on such concerns as international peace and domestic security, affordable health care, the swift and secure transmission of information, the conservation of resources, and a clean environment. Progress in materials science and engineering is impacting each of these concerns. This article will present some examples of how this is occurring and then comment on ethical dilemmas that can arise as a consequence of technological advances. The need for engineers to participate more fully in the development of public policies that help resolve such dilemmas, and so promote the benefits of advancing technology to society, will be discussed. RP Westwood, ARC (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 34 TC 0 Z9 0 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD JUN PY 1996 VL 27 IS 6 BP 1413 EP 1426 DI 10.1007/BF02649801 PG 14 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA UR669 UT WOS:A1996UR66900001 ER PT J AU Ramanujan, RV Maziasz, PJ AF Ramanujan, RV Maziasz, PJ TI The mechanism of formation of a fine duplex microstructure in Ti-48Al-2Mn-2Nb alloys SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Symposium on Atomistic Mechanisms of Nucleation and Growth in Solids, at TMS/ASM Materials Week CY OCT 03-05, 1994 CL ROSEMONT, IL SP TMS, ASM ID MORPHOLOGY; PHASE AB The mechanism of formation of the fine duplex microstructure resulting from the alpha --> gamma transformation in water-quenched Ti-48Al-2Mn-2Nb alloys was studied using transmission and analytical electron microscopy. As-cast Ti-48Al-2Mn-2Nb alloys were heat treated in the alpha phase field and water quenched to room temperature. The resulting microstructure (referred to as a fine duplex microstructure) consisted of equiaxed grains and abutting lath colonies. Both the colonies and the grains were composed of the gamma phase, twinned gamma laths, and alpha(2) laths. It was found that the transformation from alpha to gamma in the fine duplex microstructure took place through long range diffusional processes, and competitive growth between the equiaxed and lath morphology occurred. Nucleation of the gamma phase from the alpha matrix can occur through nucleation an stacking faults, followed by growth through the sympathetic nucleation and growth of new gamma laths on a substrate lath. The observed misorientations and the interfacial structures between the laths were found to be consistent with such a mechanism. Competition between such nucleation and growth mechanisms for the equiaxed and lath morphologies of gamma leads to the formation of lath colonies (of gamma and alpha(2)) interspersed with equiaxed grains in these alloys. C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RI Ramanujan, Raju/A-2245-2011; OI Maziasz, Philip/0000-0001-8207-334X NR 33 TC 14 Z9 14 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1073-5623 EI 1543-1940 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD JUN PY 1996 VL 27 IS 6 BP 1661 EP 1673 DI 10.1007/BF02649823 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA UR669 UT WOS:A1996UR66900023 ER PT J AU Wang, LL Wallace, TC Hampel, FG Steele, JH AF Wang, LL Wallace, TC Hampel, FG Steele, JH TI Vacuum evaporation of KCl-NaCl salts .2. Vaporization-rate model and experimental results SO METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE LA English DT Article AB A model based on the Hertz-Langmuir relation is used to describe how evaporation rates of the binary KCl-NaCl system change with time. The effective evaporation coefficient (LY), which is a ratio of the actual evaporation rate to the theoretical maximum, was obtained for the KCl-NaCl system using this model. In the temperature range of 640 degrees C to 750 degrees C, the effective evaporation coefficient ranges from similar to 0.4 to 0.1 for evaporation experiments conducted at 0.13 Pa. At temperatures below the melting point, the lower evaporation coefficients are suggested to result from the more complex path that a molecule needs to follow before escaping to the gas phase. At the higher liquid temperatures, the decreasing evaporation coefficients result from a combination of the increasing vapor-flow resistances and the heat-transfer effects at the evaporation surface and the condensate layer. The microanalysis of the condensate verified that composition of the condensate changes with time, consistent with the model, calculation. The microstructural examination revealed that the vaporate may have condensed as a single solution phase, which upon cooling forms fine lamellar structures of the equilibrium KCl and NaCl phases. In conclusion, the optimum design of the evaporation process and equipment must take the mass and heat transfer factors and equipment materials issues into consideration. RP Wang, LL (reprint author), LOS ALAMOS NATL LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87544 USA. NR 12 TC 4 Z9 4 U1 0 U2 5 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1073-5615 J9 METALL MATER TRANS B JI Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci. PD JUN PY 1996 VL 27 IS 3 BP 433 EP 443 DI 10.1007/BF02914908 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA UT477 UT WOS:A1996UT47700013 ER PT J AU Joy, DC Joy, CS AF Joy, DC Joy, CS TI Low voltage scanning electron microscopy SO MICRON LA English DT Review ID RESOLUTION; CONTRAST; SEM; BOMBARDMENT; SILICON AB Low voltage scanning electron microscopy (LVSEM) is the application of the SEM at beam energies below 5 keV. The fall in electron beam range compared to its magnitude at higher energies leads to significant changes in the beam interaction volume and in the secondary and backscattered electron yields. The topographic and beam penetration contrast effects which dominate images at high energies are replaced by detector collection efficiency contrast effects giving images which are less three dimensional but which contain more detailed information on the surface morphology and, in some circumstances, the surface chemistry of the specimen. In order to observe non-conducting specimens a state of charge balance must be obtained to obviate imaging artifacts. This requires an optimized choice of the incident beam energy, sample tilt, beam current and magnification for each sample. The high stopping power of electrons at low energy can result in enhanced radiation damage. However, because of the small electron range such damage is confirmed to a thin, near surface, region of the specimen. The combination of a field emission gun and a high performance lens allows the probe size of the instrument to be made almost independent of the chosen beam energy over the range 1-30 keV and probable advance in electron sources and electron optics promise still better levels of performance for the LVSEM. Copyright (C) 1996 Elsevier Science Ltd. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Joy, DC (reprint author), UNIV TENNESSEE,EM FACIL,KNOXVILLE,TN 37996, USA. NR 51 TC 152 Z9 155 U1 6 U2 66 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0968-4328 J9 MICRON JI Micron PD JUN-AUG PY 1996 VL 27 IS 3-4 BP 247 EP 263 DI 10.1016/0968-4328(96)00023-6 PG 17 WC Microscopy SC Microscopy GA VT960 UT WOS:A1996VT96000008 ER PT J AU Jostes, RF AF Jostes, RF TI Genetic, cytogenetic, and carcinogenic effects of radon: A review SO MUTATION RESEARCH-REVIEWS IN GENETIC TOXICOLOGY LA English DT Article DE radon; carcinogenesis; genetic damage; cytogenetic damage ID ALPHA-PARTICLE IRRADIATION; CHO CELL-LINES; LUNG-CANCER; URANIUM MINERS; ONCOGENIC TRANSFORMATION; MECHANISTIC CONSIDERATIONS; EPITHELIAL-CELLS; DECAY PRODUCTS; DOSE-RATE; MUTATIONS AB Radon exposure has been linked to lung carcinogenesis in both human and animal studies. Studies of smoking and nonsmoking uranium miners indicate that radon alone is a risk factor for lung cancer at the levels encountered by these miners, although the possibility exists that other substances in the mine environment affect the radon-induced response. The relevance of data from mines to the lower-exposure home environment is often questioned; still, a recent study of miners exposed to relatively low radon concentrations demonstrated a statistically significant increase for lung and laryngeal cancer deaths. In two major series of experiments with rats, the primary carcinogenic effect found was respiratory tract tumors, and evidence for an inverse exposure-rate effect was also noted. Although this inverse dose-rate effect also has been described in underground miner studies, it may not similarly apply to radon in the home environment. This observation is due to the fact that, below a certain exposure, cells are hit once or not at all, and one would not expect any dose-rate effect, either normal or inverse. Because some chromosome aberrations persist in cycling cells as stable events, cytogenetic studies with radon are being performed to help complete the understanding of the events leading to radon-induced neoplasia. Radon has been found to induce 13 times as much cytogenetic damage (as measured by the occurrence of micronuclei) than a similar dose of Co-60. A wide variety of mutation systems have demonstrated alpha-particle mutagenesis; recent investigations have focused on the molecular basis of alpha-induced mutagenesis. Gene mutations are induced by radon in a linear and dose-dependent fashion, and with a high biological effect relative to low-LET irradiation. Studies of the hprt locus show that approximately half of the alpha-induced mutations arise by complete deletion of the gene; the remaining mutations are split between partial deletions, rearrangements, and events not detectable by Southern blot or PCR exon analysis. Although other mutation systems do not show the same spectra as observed in the hprt gene (suggesting that the gene environment affects response), DNA deletions or multilocus lesions of various size appear to be predominant after radon exposure. As data emerge regarding radon-induced changes at the chromosomal and molecular level, the mechanisms involved in radon carcinogenesis are being clarified. This information should increase the understanding of risk at the low exposure levels typically found in the home. C1 PACIFIC NW NATL LAB, RICHLAND, WA 99352 USA. NR 87 TC 33 Z9 34 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1110 J9 MUTAT RES-REV GENET JI Mutat. Res.-Rev. Genet. Toxicol. PD JUN PY 1996 VL 340 IS 2-3 BP 125 EP 139 DI 10.1016/S0165-1110(96)90044-5 PG 15 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA UU701 UT WOS:A1996UU70100006 PM 8692177 ER PT J AU SimanTov, M AF SimanTov, M TI Application of energy balance and direct substitution methods for thermal margins and data evaluation SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID PREDICTION; MODEL AB Thermal limits, such as critical hear flux (CHF), flow excursion (FE) and incipient boiling (IB), are used to determine the maximum operating power for a variety of thermal systems, most importantly nuclear reactors. In doing so, a variety of analytical tools, concepts, and techniques are involved. Concepts and definitions involved include the critical heat flux ratio (CHFR), the critical power ratio (CPR) or departure from nucleate boiling power ratio (DNBPR), the direct substitution method (DSM), the heat balance method (HEM), local correlations, system or global correlations, and upstream effects. Some of these concepts and terms cause confusion and misunderstanding in the technical community as to their real physical meaning and their proper application. Some investigators argue strongly in support of using the CPR for determining safety margins in nuclear reactors rather than the CHFR and still others argue that the use of the HEM for thermal limits data and correlation evaluation gives ''consistently better predictions than when using DSM''. Those claims are an indication of a general confusion in understanding and applying these concepts. The intent of this paper is to first define and clarify the issues involved and second to show that either concept, CHFR or CPR, can be used for defining margins. The selection depends on the interest of the investigator and is conditional on understanding what the results mean physically. However, the present author believes that the use of HEM for data evaluation can be misleading and tends to imply incorrectly a closer agreement between the data and the correlation than can be justified. Furthermore, some correlations cannot be used correctly for certain applications, in spite of the fact that they seem to be ''stastistically superior''. RP SimanTov, M (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 9 TC 9 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1996 VL 163 IS 1-2 BP 249 EP 258 DI 10.1016/0029-5493(95)01174-9 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA UX602 UT WOS:A1996UX60200023 ER PT J AU Ho, DDM Brandon, ST AF Ho, DDM Brandon, ST TI Autoneutralization of space charge dominated beams for heavy ion fusion SO NUCLEAR FUSION LA English DT Article ID INERTIAL FUSION; POWER AB Several heavy ion beams, each with current in the kiloampere range and particle energy in the gegaelectronvolt range, must be focused onto a millimetre size spot to provide the power required for ignition of high gain, radiation driven targets for inertial confinement fusion. It is difficult to achieve this condition for three reasons: (a) The repulsive space charge forces within individual beams and the mutual space charge repulsion among the beams, which are strongest dear the focal spot, prevent multiple beams from focusing onto a small spot. (b) Beam current increases from beam head to tail, so the beam-beam repulsion is time dependent. This prevents multiple beams from being focused onto a small spot throughout the entire pulse. (c) Radiation from the beam heated target photoionizes some beam ions into higher charge states, and these ions are expelled from the beam by the space charge force. To minimize these three effects, it is proposed to place a metallic cylinder in front of the focal spot and to cover the cylinder, at the beam entrance end, with a plastic him of submicron thickness. As the beams pass through the film, the beam space charge force draws electrons from the film to co-move with the beam, 'autoneutralizing' the ion beams inside the cylinder. Although the film strips beam ions into higher charge states, particle-in-cell simulations show that autoneutralization is so effective that the residual radial electric field in the neutralized beam is considerably less than that in the unneutralized beam. The application of this scheme thereby results in a great improvement in focusing quality. Beams with higher charge state or lower mass ions, which have the advantages of reducing both the length of the high energy section of induction linacs and the strengths of the final-focusing magnets, can therefore be used. RP Ho, DDM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 30 TC 4 Z9 4 U1 0 U2 0 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 JUN PY 1996 VL 36 IS 6 BP 769 EP 781 DI 10.1088/0029-5515/36/6/I08 PG 13 WC Physics, Fluids & Plasmas SC Physics GA XY887 UT WOS:A1996XY88700008 ER PT J AU Leitch, MJ Anderson, ME Kapustinsky, J Li, TK Mishra, CS Peng, JC Simmons, JE Dytman, SA Hardie, JG VonReden, KF Smith, C AF Leitch, MJ Anderson, ME Kapustinsky, J Li, TK Mishra, CS Peng, JC Simmons, JE Dytman, SA Hardie, JG VonReden, KF Smith, C TI Performance of a BGO-NaI eta spectrometer SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A two-arm spectrometer, designed to detect eta and pi(0) mesons, has been built and used in (pi, eta) measurements at LAMPF. This spectrometer contains BGO active converters and NaI total-energy counters. Its construction and performance for (pi(-), pi(0)) and (pi(-), eta) measurements on CH2 are described, Novel techniques to monitor the gains of the BGO and NaI counters are also presented. C1 UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22901. RP Leitch, MJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 5 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 JUN 1 PY 1996 VL 374 IS 3 BP 299 EP 302 DI 10.1016/0168-9002(96)00181-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA UU668 UT WOS:A1996UU66800004 ER PT J AU Schiekel, T Sudbrock, F Herpers, U Gloris, M Lange, HJ Leya I Michel, R DittrichHannen, B Synal, HA Suter, M Kubik, PW Blann, M Filges, D AF Schiekel, T Sudbrock, F Herpers, U Gloris, M Lange, HJ Leya, I Michel, R DittrichHannen, B Synal, HA Suter, M Kubik, PW Blann, M Filges, D TI Nuclide production by proton-induced reactions on elements (6<=Z<=29) in the energy range from 200MeV to 400MeV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Review ID FRAGMENTATION CROSS-SECTIONS; INDUCED NUCLEAR-REACTIONS; PRE-EQUILIBRIUM DECAY; HYBRID-MODEL ANALYSIS; 12 GEV PROTONS; EXCITATION-FUNCTIONS; COSMOGENIC NUCLIDES; RELATIVISTIC NUCLEI; CARBON TARGETS; COSMIC-RAY AB In the course of a systematic investigation of integral cross sections for nuclide production by proton-induced reactions, irradiation experiments were carried out with proton energies of 300 and 400 MeV at the Laboratoire National Saturne, Saclay, France using the stacked-foil technique. We included 19 different target elements with atomic numbers between 6 and 79 (C, N, O, Mg, Al, Si, Ca, Ti, Mn, Fe, Co, Ni, Cu, Sr, Y, Zr, Nb, Ba and Au) in our experiments, of which we report here results up to Z = 29. Residual nuclides were measured by gamma-spectrometry and by accelerator mass spectrometry (AMS). Corrections of the cross sections for reactions of interfering secondary particles between 5% and 30% had to be made. Results from thin targets placed in front of the stacks, for which no contributions of secondaries occured, are in excellent agreement with the ones from targets inside the stacks after correction. About 700 cross sections for 114 reactions were measured. The new data show excellent consistency with the earlier measurements of our group below 200 MeV and above 400 MeV. The now existing data base of experimental excitation functions for the production of short-lived and some long-lived radionuclides relevant for cosmic ray interactions with extraterrestrial and terrestrial matter, i.e. Be-10, Al-26, and Cl-36, is discussed in detail. The experimental data are compared with theoretical ones based on calculations using an INC/E model and on the hybrid model of preequilibrium reactions. C1 UNIV HANNOVER, ZENTRUM STRAHLENSCHUTZ & RADIOOKOL, D-30167 HANNOVER, GERMANY. UNIV COLOGNE, ABT NUKL CHEM, D-50674 COLOGNE, GERMANY. ETH HONGGERBERG, INST TEILCHENPHYS, PAUL SCHERRER INST, CH-8093 ZURICH, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, ARBEITSGRP STRAHLUNGSTRANSPORT, D-52425 JULICH, GERMANY. NR 166 TC 57 Z9 58 U1 0 U2 9 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 JUN PY 1996 VL 114 IS 1-2 BP 91 EP 119 DI 10.1016/0168-583X(96)00145-0 PG 29 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA UY531 UT WOS:A1996UY53100014 ER PT J AU Bae, YK Beuhler, RJ Chu, YY Friedlander, G Xu, Y Friedman, L AF Bae, YK Beuhler, RJ Chu, YY Friedlander, G Xu, Y Friedman, L TI Detection of accelerated large water cluster ions and electrosprayed biomolecules with passivated solid state detectors SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID MASS-SPECTROMETRY; PROTEIN IONS AB The passivated solid state detector with a 500 A boron doped window was observed to be sensitive to impacts of large (H2OH+ (100 < n < 1500) ions and multiply charged macro biomolecular ions accelerated in a 600 kV Cockcroft-Walton accelerator, although the ions have isolated atomic ranges smaller than the thickness of the detector window. For biomolecular ions generated by an electrospray ion source the detector pulse height spectra showed clearly resolved peaks that are consistent with the existence of aggregate ions of composition M(z), 2M(2z),...,5M(5z) ions. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 11 TC 10 Z9 10 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 JUN PY 1996 VL 114 IS 1-2 BP 185 EP 190 DI 10.1016/0168-583X(96)00043-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA UY531 UT WOS:A1996UY53100024 ER PT J AU Quinn, H AF Quinn, H TI CP violation SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on Production and Decay of Hyperons, Charm and Beauty Hadrons CY SEP 05-08, 1995 CL STRASBOURG, FRANCE SP CERN, CRN, DESY ID STANDARD MODEL; BARYON ASYMMETRY; UNIVERSE AB In this talk I briefly review the cosmological importance of CP violation and the status of calculations of baryogenisis in the context of the Standard Model. I then turn to a discussion of Standard Model Predictions for CP violation in B decays, stressing the importance of multiple measurements to overconstrain the model parameters and thus search for indications of beyond-Standard-Model physics. RP Quinn, H (reprint author), STANFORD LINEAR ACCELERATOR CTR,POB 4349,STANFORD,CA 94309, USA. NR 8 TC 1 Z9 1 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 JUN PY 1996 SU 50 BP 17 EP 23 DI 10.1016/0920-5632(96)00359-3 PG 7 WC Physics, Particles & Fields SC Physics GA VA494 UT WOS:A1996VA49400006 ER PT J AU Jaros, JA AF Jaros, JA TI B lifetimes and mixing with the SLD SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on Production and Decay of Hyperons, Charm and Beauty Hadrons CY SEP 05-08, 1995 CL STRASBOURG, FRANCE SP CERN, CRN, DESY AB The lifetimes of B-0 and B-+/- mesons have been measured with the SLD detector at the SLC using topological reconstructions of the B mesons. Studies of B-s mixing, using similar techniques, show that the prospects for measuring B-s mixing with an upgraded vertex detector are good if x(s) less than or equal to 15. RP Jaros, JA (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 10 TC 0 Z9 0 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 JUN PY 1996 SU 50 BP 71 EP 76 PG 6 WC Physics, Particles & Fields SC Physics GA VA494 UT WOS:A1996VA49400015 ER PT J AU Cheung, HWK AF Cheung, HWK TI Fermilab E687 results and future high statistics charm experiment FOCUS/E831 SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on Production and Decay of Hyperons, Charm and Beauty Hadrons CY SEP 05-08, 1995 CL STRASBOURG, FRANCE SP CERN, CRN, DESY ID BRANCHING RATIO; DALITZ PLOTS; MESON DECAY; LIFETIME; BARYON; OMEGA(0)(C); MASS; C+ AB Results from the Fermilab charm photoproduction experiment E687 are reviewed. The physics goals and the improvements being made for the next experiment (FOCUS/E831) are described. We expect to accumulate a million fully reconstructed charm decays which represent an order of magnitude improvement over E687. RP Cheung, HWK (reprint author), FERMILAB NATL ACCELERATOR LAB,MS 122 POB 500,BATAVIA,IL 60510, USA. NR 47 TC 1 Z9 1 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 JUN PY 1996 SU 50 BP 154 EP 161 DI 10.1016/0920-5632(96)00383-0 PG 8 WC Physics, Particles & Fields SC Physics GA VA494 UT WOS:A1996VA49400030 ER PT J AU Lach, J AF Lach, J TI Hyperons at FERMILAB SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on Production and Decay of Hyperons, Charm and Beauty Hadrons CY SEP 05-08, 1995 CL STRASBOURG, FRANCE SP CERN, CRN, DESY ID MAGNETIC-MOMENT; PRODUCTION POLARIZATION; 800-GEV/C PROTONS; INCLUSIVE-LAMBDA; SIGMA+; ASYMMETRY; MODELS AB Magnetic moment measurements of the baryon octet and decouplet have recently been completed. These measurements illustrate the success as well as the limitations of the simple quark model. Measurements of hyperon production polarizations have shown this to be a rich and complex process. It has forced us to reconsider our basic understanding of hyperon polarization processes. RP Lach, J (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 35 TC 13 Z9 13 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 JUN PY 1996 SU 50 BP 216 EP 222 DI 10.1016/0920-5632(96)00394-5 PG 7 WC Physics, Particles & Fields SC Physics GA VA494 UT WOS:A1996VA49400041 ER PT J AU McBride, P AF McBride, P TI Studies for a dedicated B detector at the Fermilab collider SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on Production and Decay of Hyperons, Charm and Beauty Hadrons CY SEP 05-08, 1995 CL STRASBOURG, FRANCE SP CERN, CRN, DESY ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E-PHYSICS; VERSION AB The observation of CP violation in the B system is one of the great experimental challenges of the next decade. Several B factories are already planned, however, there will be many interesting measurements awaiting a second generation of B exeriments. Studies are being carried out to design a dedicated collider B experiment for the Tevatron at Fermilab. A dedicated B detector at a hadron collider will have a physics reach beyond that of experiments scheduled to begin operation before the end of the decade. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP McBride, P (reprint author), PRINCETON UNIV,PRINCETON,NJ 08544, USA. 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 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN PY 1996 SU 50 BP 240 EP 247 DI 10.1016/0920-5632(96)00398-2 PG 8 WC Physics, Particles & Fields SC Physics GA VA494 UT WOS:A1996VA49400045 ER PT J AU Kronfeld, AS AF Kronfeld, AS TI Lattice QCD and the standard model SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 29th International Symposium Ahrenshoop on the Theory of Elementary Particles CY AUG 29-SEP 02, 1995 CL BUCKOW, GERMANY SP DESY Inst High Energy Phys Zeuthen, Humboldt Univ Berlin, Inst Elementary Particle Phys, Univ Hannover, Inst Theoret Phys, Univ Munich, Sect Phys ID QUANTUM-FIELD THEORIES; SPIN-DEPENDENT FORCES; VOLUME DEPENDENCE; WILSON FERMIONS; ENERGY-SPECTRUM; B-PARAMETER; HEAVY; STATES; MATRIX; CONTINUUM AB Most of the poorly known parameters of the Standard Model cannot be determined without reliable calculations in nonperturbative QCD. Lattice gauge theory provides a first-principles definition of the required functional integrals, and hence offers ways of performing these calculations. This paper reviews the progress in computing hadron spectra and electroweak matrix elements needed to determine alpha(S), the quark masses, and the Cabibbo-Kobayashi-Maskawa matrix. RP FERMILAB NATL ACCELERATOR LAB, THEORET PHYS GRP, POB 500, BATAVIA, IL 60510 USA. OI Kronfeld, Andreas/0000-0003-2716-1149 NR 74 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN PY 1996 SU 49 BP 269 EP 281 DI 10.1016/0920-5632(96)00344-1 PG 13 WC Physics, Particles & Fields SC Physics GA UU049 UT WOS:A1996UU04900037 ER PT J AU Modarres, M Martz, H Kaminskiy, M AF Modarres, M Martz, H Kaminskiy, M TI The Accident Sequence Precursor analysis: Review of the methods and new insights SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Review AB The Accident Sequence Precursor (ASP) program methods and results are reviewed. Generally, it is concluded that the ASP program is useful and that continued methods improvement efforts currently under way should be continued. More care is needed in the interpretation of results. Alternative methods and treatments for the analysis of operational events and the use of ASP results are determined. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Modarres, M (reprint author), UNIV MARYLAND,COLLEGE PK,MD 20742, USA. NR 42 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1996 VL 123 IS 2 BP 238 EP 258 PG 21 WC Nuclear Science & Technology SC Nuclear Science & Technology GA UP972 UT WOS:A1996UP97200007 ER PT J AU Vilim, RB Brock, RW AF Vilim, RB Brock, RW TI A method for measurement of delayed neutron parameters for liquid-metal-cooled power reactors SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB The trend toward increased reliance on passive features for power reactor safety makes if important to obtain the characteristics of the reactor system from measurements on the system. A method is described for solving for the delayed neutron parameters in a liquid-metal power reactor by fitting an analytic solution of the point-kinetics equations to the flux die-away from a dropped rod in an initially critical core. The method includes treatment of those conditions found in a power reactor that depart from those in a critical assembly experiment. These include a comparatively long rod drop time and a detector signal that instead of providing an integrated count rate is a sampled data signal proportional to the instantaneous fission power. The delayed neutron parameter values calculated from a rod drop experiment in the Experimental Breeder Reactor II are in agreement with values calculated using first principles and knowledge of core material composition and nuclear cross sections. C1 BABCOCK & WILCOX CO,LYNCHBURG,VA 24501. RP Vilim, RB (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1996 VL 123 IS 2 BP 259 EP 271 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA UP972 UT WOS:A1996UP97200008 ER PT J AU Hobbs, DT Karraker, DG AF Hobbs, DT Karraker, DG TI Recent results on the solubility of uranium and plutonium in Savannah river site waste supernate SO NUCLEAR TECHNOLOGY LA English DT Article DE uranium solubility; plutonium AB The high-activity waste from Savannah River Site fuel reprocessing is stored as a two-layered mixture in mild steel tanks. The solid layer contains the hydrolyzable cations, including most of the actinides: the supernatant liquid is a strong base-salt solution that includes Cs-137. To gain storage capacity, the supernate is evaporated to solids, then redissolved for waste processing. The solubility of uranium and plutonium in the supernate is low, but evaporation raises the possibility of an accumulation in the evaporator. This study of uranium and plutonium solubility by statistical design experiments and under simulated evaporator conditions found that uranium solubility decreases to 5 to 10 ppm as the supernate is evaporated; plutonium solubility increases from 1 to similar to 10 ppm. The possibility of uranium accumulation in an evaporator exists, but the possibility of plutonium accumulation appears to be small. RP Hobbs, DT (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29808, USA. NR 8 TC 10 Z9 10 U1 3 U2 5 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1996 VL 114 IS 3 BP 318 EP 324 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA UM943 UT WOS:A1996UM94300005 ER PT J AU Cheng, XH Camp, DG Wu, QY Bakhtiar, R Springer, DL Morris, BJ Bruce, JE Anderson, GA Edmonds, CG Smith, RD AF Cheng, XH Camp, DG Wu, QY Bakhtiar, R Springer, DL Morris, BJ Bruce, JE Anderson, GA Edmonds, CG Smith, RD TI Molecular weight determination of plasmid DNA using electrospray ionization mass spectrometry SO NUCLEIC ACIDS RESEARCH LA English DT Article ID MULTIPLY CHARGED IONS; HUMAN GENOME; BIOMOLECULES AB lonization and molecular weight (MW) determination of megadalton size plasmid DNA has been achieved using electrospray ionization (ESI) with Fourier transform ion cyclotron resonance (FTICR) mass spectrometry, DNA molecules were shown to remain intact through electrospray ionization by collection on a specially prepared surface, followed by agarose gel electrophoresis. Individual highly charged ions of plasmid DNA produced by ESI were trapped in an FTICR cell for up to several hours and reacted with acetic acid to induce charge state shifts, Measurements of mass-to-charge ratios for these multiple peaks arising from charge state shifting give MW measurements of individual ions with an average accuracy of 0.2%, The MW distribution was obtained by measurements for a number of individual ions from the same sample [plasmid DNA: pGEM-5S MW(cal) = 1.946 MDa], yielding a MW(obs) of 1.95 +/- 0.07 MDa for ions clustered in the vicinity of the expected MW. C1 PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. EASTERN OREGON STATE COLL, DEPT CHEM, LA GRANDE, OR 97850 USA. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 35 TC 55 Z9 55 U1 0 U2 3 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUN 1 PY 1996 VL 24 IS 11 BP 2183 EP 2189 DI 10.1093/nar/24.11.2183 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UR379 UT WOS:A1996UR37900028 PM 8668552 ER PT J AU Halling, AM AF Halling, AM TI Asymmetries in charm production in fixed-target experiments SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID HEAVY QUARK PRODUCTION; NUCLEON-INTERACTIONS; MESON PRODUCTION; PI; HADROPRODUCTION; PHOTOPRODUCTION; COLLISIONS; QCD AB From the experimentalist's viewpoint the measurement of charm production asymmetries, the ratio of charm production cross-sections for particle and anti-particle, is a very productive field. Accurate measurements can be made that are largely free of systematic errors, and since leading-order QCD calculations produce no asymmetry, these measurements test fragmentation and other effects. Simple phenomenological models explain the gross features of the data, while a variety of more detailed models attempt to fit the rich details of the present data samples. This paper will briefly highlight the differences among a few of the theoretical models, and include a brief history of recent experimental measurements. New measurements from present experiments will be presented in more detail, with an emphasis on recent results from WA89, E687 and E791. This will be followed by a short summary of results expected in the near future from these and similar experiments, and by a shorter preview of the improvements expected in the next decade. RP Halling, AM (reprint author), FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. NR 26 TC 2 Z9 2 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 617 EP 629 DI 10.1007/BF02731696 PG 13 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400002 ER PT J AU Paulini, M AF Paulini, M TI Highlights of B physics at CDF SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID CHARGE; COLLIDER; DETECTOR; SEARCH; DECAYS AB The CDF experiment at the Fermilab Tevatron collider has produced many B physics results. Recent measurements on B meson masses, B lifetimes, B branching ratios, limits on rare B decays, and B flavour tagging studies are reviewed. RP Paulini, M (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. OI Paulini, Manfred/0000-0002-6714-5787 NR 14 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 631 EP 639 PG 9 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400003 ER PT J AU Su, D AF Su, D TI Production of charm and beauty in e(+)e(-) with polarized electron beams SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID FORWARD-BACKWARD ASYMMETRY; PRECISE MEASUREMENT; QUARK; DECAYS; A(B) AB The test of the Standard Model through the measurements of Z(0) to fermion couplings can benefit from much enhanced sensitivity by using longitudinally polarized electron beams. This paper reviews preliminary electroweak measurements from SLD on heavy-quark production at the Z(0), using 150000 hadronic Z(0) decays accumulated during the 1993-1995 runs with high electron beam polarization. The parity-violating parameters A(b) and A(c) of the Zbb and Zee couplings are measured directly from the left-right forward-backward asymmetries. A measurement of R(b) with a lifetime double tag and a summary of the preliminary measurement of A(LR) from the 1993-1995 SLD data are also included in this report. RP Su, D (reprint author), STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 663 EP 673 PG 11 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400006 ER PT J AU Incandela, J AF Incandela, J TI CDF top-quark production and mass SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID (P)OVER-BAR-P COLLISIONS AB The top search in the dilepton and lepton plus jets channels with the Collider Detector at Fermilab is presented. The analysis uses a 67 pb(-1) sample of p (p) over bar collisions at 1.8 TeV. A 4.8 sigma excess of candidate events establishes the existence of the top quark. The t (t) over bar production cross-section is measured to be sigma(t (t) over bar) = 7.6(-2.0)(+2.4) pb with branching ratio BR(t --> Wb) = 0.87(-0.30)(+0.13)(stat)(-0.11)(+0.13)(syst). The measured mass is M(top) = (176 +/- 8 +/- 10) GeV. RP Incandela, J (reprint author), FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. NR 7 TC 12 Z9 12 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 741 EP 746 PG 6 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400014 ER PT J AU Protopopescu, S AF Protopopescu, S TI Observation of the top quark SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID ROOT-S=1.8 TEV; (P)OVER-BAR-P COLLISIONS; P(P)OVER-BAR COLLISIONS; DETECTOR; SEARCH AB The D0 Collaboration reports on a search for the Standard Model top quark in p (p) over bar collisions at root s = 1.8 TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50 pb(-1). We have searched for t (t) over bar production in the dilepton and single-lepton decay channels, with and without tagging of b quark jets. We observe 17 events with an expected background of 3.8 +/- 0.6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2 . 10(-6) (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top-quark decay. We conclude that we have observed the top quark and measure its mass to be 199(-21)(+19)(stat) +/- 22(syst) GeV/c(2) and its production cross-section to be (6.4 +/- 2.2) pb. RP Protopopescu, S (reprint author), BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 755 EP 769 PG 15 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400016 ER PT J AU Atwood, D Blok, B Soni, A AF Atwood, D Blok, B Soni, A TI Feasibility of extracting V-td from radiative B(B-s) decays SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID LATTICE CALCULATION; NONLEPTONIC DECAYS; STANDARD MODEL; CHARMED MESONS; B-MESONS; RARE; TRANSITION; CONSTANTS AB We use experimental information on D- --> K*(0) rho(-) and B --> psi + K*, coupled with flavor independence of QCD, and with vector meson dominance to show that long-distance contributions to B --> rho + gamma, especially B- --> rho(-) + gamma, are potentially very serious. Estimates based on the annihilation graph are shown to lead to similar conclusions. We emphasize that long-distance (LD) contributions can be appreciably different in B- --> rho(-) + gamma and B-0 --> rho(0) (omega) + gamma. All radiative decays of B, B-s are shown to be governed essentially by two LD and two short-distance (SD) hadronic entities. Despite the presence of considerable LD contributions, we show how separate measurements of B- --> rho(-) + gamma, B-0 --> rho(0) (omega) + gamma, along with the B --> --> K* + gamma can be used for a systematic extraction of V-td. Measurements of B-s --> phi + gamma and K*(0) + gamma could also provide very useful consistency checks. C1 TECHNION ISRAEL INST TECHNOL, INST THEORET PHYS, HAIFA, ISRAEL. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP Atwood, D (reprint author), STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 46 TC 7 Z9 7 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 873 EP 883 DI 10.1007/BF02823629 PG 11 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400026 ER PT J AU McKemey, A AF McKemey, A TI The SLD CCD pixel vertex detector and its upgrade SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB The SLD CCD vertex detector (VXD2) comprises 480 1 cm(2) commercial CCDs in a 120 Mpixel detector, and was operational at the SLC from 1992 to 1995. The performance of VXD2 is presented, based upon three years of running experience. A new vertex detector (VXD3) will be installed in late 1995 for the future runs of SLD. VXD3 uses 96 13 cm(2) custom made CCDs in a 307 Mpixel detector, and will provide 3 space point measurements per track of about 5 mu m resolution in all three coordinates. The VXD3 detector will achieve significant improvements in impact parameter resolution (about a factor of two) and acceptance (about 20%) through optimised geometry and reduced material. The design and predicted performance of VXD3 are presented. C1 STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. RP McKemey, A (reprint author), BRUNEL UNIV, UXBRIDGE UB8 3PH, MIDDX, ENGLAND. NR 2 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 1027 EP 1034 PG 8 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400040 ER PT J AU Lipton, R AF Lipton, R TI Prospects for future beauty physics at the Tevatron SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB We discuss prospects for future B physics studies at the Tevatron. Plans for Tevatron improvements are outlined. The basic features of beauty production at collider energies are discussed in the context of CP violation measurements. Physics prospects for the upgrades of CDF and D0 as well as possible future dedicated B collider detectors are examined. RP Lipton, R (reprint author), FERMILAB NATL ACCELERATOR LAB, POB 500, WILSON RD, BATAVIA, IL 60510 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JUN-JUL PY 1996 VL 109 IS 6-7 BP 1089 EP 1094 DI 10.1007/BF02823649 PG 6 WC Physics, Particles & Fields SC Physics GA VQ664 UT WOS:A1996VQ66400046 ER PT J AU Beaudoin, AJ Mecking, H Kocks, UF AF Beaudoin, AJ Mecking, H Kocks, UF TI Development of localized orientation gradients in fcc polycrystals SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID ALUMINUM SINGLE-CRYSTALS; CRYSTALLOGRAPHIC TEXTURE; CUBE TEXTURE; RECRYSTALLIZATION; EVOLUTION; ANISOTROPY AB A finite-element formulation which derives constitutive response from crystal plasticity theory is used to examine localized deformation in fee polycrystals. The polycrystals are (simple) idealized three-dimensional arrangements of grains, and many elements per grain. Non-uniform deformations within individual grains lead to the development of domains that are separated by boundaries of high misorientation. Also, localized shearing is seen to occur on a microscopic scale of grain dimensions. The important consequence of these simulations is that the predicted local inhomogeneities are meeting various requirements that make them possible nucleation sites for recrystallization. C1 TECH UNIV HAMBURG,D-21071 HAMBURG,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Beaudoin, AJ (reprint author), REYNOLDS MET CO,RICHMOND,VA 23261, USA. RI Kocks, Fred/E-1159-2011 NR 25 TC 79 Z9 79 U1 1 U2 18 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUN PY 1996 VL 73 IS 6 BP 1503 EP 1517 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA UW591 UT WOS:A1996UW59100001 ER PT J AU Schoenfeld, SE Ahzi, S Asaro, RJ Blumenthal, WR AF Schoenfeld, SE Ahzi, S Asaro, RJ Blumenthal, WR TI The bulk processing of 2223 BSCCO powders .1. Densification and mechanical response SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID PLASTIC-DEFORMATION; SUPERCONDUCTORS; POLYCRYSTALS; CRYSTALS AB The anisotropic mechanical properties of densified BSCCO (Bi-Sr-Ca-Cu-O) powders are of paramount importance during thermo-mechanical processing of superconducting tapes and wires. Maximum current transport requires both high relative density and a high degree of alignment of the single crystal superconducting planes parallel to the plane of the tape. This is also a configuration that causes high stresses during compressive (i.e. densifying) processing modes. These high stresses can lead to cracking, and thus degrade the density, and eventually the conductive properties of the tape. The current work develops a micromechanically based material model for such densified powders. The deformation mechanisms of interest are crystallographic glide and porosity evolution; thus the model takes the form of a porous, elastic-viscoplastic polycrystal material theory. This has been achieved by coupling the modified Taylor type polycrystal model of Schoenfeld, Ahzi and Asaro in a generic way to yield surface type flow theories. The porosity model of Fleck, Kuhn and McMeeing is used to describe the evolution of porosity with deformation. Compaction experiments on 2223 BSCCO (Bi2Cr2Ca2Cu3Ox) powder is done in a confined channel die environment so as to simulate the plane strain tape rolling environment. The model is calibrated and compared to these experimental results, and then employed to resolve the effects of initial texture and confinement pressure on the densification and ultimate formability of the powder. In Part II of this work, the current model will be applied in order to resolve states of stress and textural alignment in the BSCCO conductor during tape rolling, and hence improve the current state of the art in tape manufacturing. C1 UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 18 TC 6 Z9 6 U1 5 U2 8 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUN PY 1996 VL 73 IS 6 BP 1565 EP 1590 PG 26 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA UW591 UT WOS:A1996UW59100004 ER PT J AU Schoenfeld, SE Asaro, RJ Ahzi, S Bingert, JF Willis, JO AF Schoenfeld, SE Asaro, RJ Ahzi, S Bingert, JF Willis, JO TI The bulk processing of 2223 BSCCO powders .2. Tape rolling SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID CRITICAL-CURRENT-DENSITY; DEFORMATION; TEXTURE; SUPERCONDUCTORS AB The anisotropic mechanical properties of densified BSCCO (Bi-Sr-Ca-Cu-O) powders are of paramount importance during thermo-mechanical processing of superconducting tapes and wires. Maximum current carrying capacity requires both high relative density and a high degree of alignment of the BSCCO single crystal's superconducting planes parallel to the plane of the tape. This is also a configuration that causes high stresses during compressive (i.e. powder compaction) deformation processing. These high stresses can lead to cracking and thus degrade the conductive properties of the tape. In Part I of this work, we outlined some of the basic phenomenology of such powders under confined channel die compression. In this part we report results from a detailed finite element analysis of the tape rolling environment. We calculate both pressures and shear strains in the core of oxide powder-in-tube (OPIT) processed tapes. Rod-in-tube processing is investigated, as well as rolling with extra packing material. The calculated deformations were then applied as boundary conditions to the detailed micromechanical model developed in Part I. The goal here was to understand the deformation environment in the core of a rolled OPIT workpiece and how this environment affects the microstructural evolution of the BSCCO powder. Such microstructures, in turn, have significant effects on the macroscopic phenomenology of the core, and thus on the success of the processing. Our calculated results are used in order to help interpret a set of prototypical rolling experiments which have been designed specifically for the purpose of investigating core morphologies as a result of various rolling environments. C1 UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 22 TC 11 Z9 11 U1 0 U2 5 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUN PY 1996 VL 73 IS 6 BP 1591 EP 1620 PG 30 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA UW591 UT WOS:A1996UW59100005 ER PT J AU Yu, N McIntyre, PC Levine, TE Giannelis, EP Mayer, JW Nastasi, M AF Yu, N McIntyre, PC Levine, TE Giannelis, EP Mayer, JW Nastasi, M TI Ion-beam-induced epitaxial crystallization of sol-gel zirconia thin films on yttria-stabilized zirconia SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article AB We have studied ion-beam-induced epitaxial crystallization and densification of sol-gel zirconia thin films on single-crystal yttria-stabilized zirconia (YSZ) substrates. The spin-coated sol-gel zirconia thin films (100 nm) on YSZ substrates were irradiated at 300 degrees C with various ion beams (360 keV argon, 360 keV neon or 180 keV oxygen). Cross-sectional transmission electron microscopy showed the presence of an epitaxial cubic zirconia layer (about 25 nm thick) near the interface between the thin film and the substrate followed by a polycrystalline cubic zirconia dominated layer (40 nm) towards the surface. In contrast to ion-beam annealing, thermal annealing alone at 900 degrees C produced a two-phase structure with both monoclinic (more than 50 vol.%) and cubic zirconia variants epitaxially related to the YSZ substrate. The study has indicated that ion irradiation at relatively low temperatures kinetically favours the epitaxial growth of the high-temperature cubic phase in the sol-gel zirconia film near the YSZ substrate. C1 CORNELL UNIV,DEPT MAT SCI & ENGN,ITHACA,NY 14853. ARIZONA STATE UNIV,DEPT CHEM BIO & MAT ENGN,TEMPE,AZ 85287. RP Yu, N (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 21 TC 2 Z9 2 U1 1 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD JUN PY 1996 VL 73 IS 6 BP 359 EP 368 DI 10.1080/095008396180632 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA UQ234 UT WOS:A1996UQ23400009 ER PT J AU Buck, DR Struve, WS AF Buck, DR Struve, WS TI Tubular exciton models for BChl c antennae in chlorosomes from green photosynthetic bacteria SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE aggregates; bacteriochlorophyll c; Chloroflexus aurantiacus; chlorosomes; green photosynthetic bacteria ID BACTERIOCHLOROPHYLL-A-PROTEIN; PUMP-PROBE SPECTROSCOPY; CHLOROFLEXUS-AURANTIACUS; ENERGY-TRANSFER; CHLOROBIUM-TEPIDUM; PIGMENT ORGANIZATION; LINEAR DICHROISM; AGGREGATION; RESOLUTION; SPECTRA AB Exciton calculations on tubular pigment aggregates similar to recently proposed models for BChl c/d/e antennae in light-harvesting chlorosomes from green photosynthetic bacteria yield electronic absorption spectra that are superimpositions of linear J-aggregate spectra. While the electronic spectroscopy of such antennae differs considerably from that of linear J-aggregates, tubular exciton models (which may be viewed as cross-coupled J-aggregates) may be constructed to yield spectra that resemble that of the BChl c antenna in the green bacterium Chloroflexus aurantiacus. Highly symmetric tubular models yield absorption spectra with dipole strength distributions essentially identical to that of a J-aggregate; strong symmetry-breaking is needed to simulate the absorption spectrum of the BChl c antenna. C1 IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. RP Buck, DR (reprint author), US DOE,AMES LAB,WASHINGTON,DC 20585, USA. NR 29 TC 21 Z9 22 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD JUN PY 1996 VL 48 IS 3 BP 367 EP 377 DI 10.1007/BF00029469 PG 11 WC Plant Sciences SC Plant Sciences GA VM632 UT WOS:A1996VM63200004 PM 24271477 ER PT J AU Prasil, O Kolber, Z Berry, JA Falkowski, PG AF Prasil, O Kolber, Z Berry, JA Falkowski, PG TI Cyclic electron flow around photosystem II in vivo SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE chlorophyll fluorescence; cyclic electron transport; oxygen evolution; Photosystem II; quantum yield ID PHOTOSYNTHETIC O2 EVOLUTION; CHLOROPHYLL FLUORESCENCE; REDOX STATE; PLASTOQUINONE POOL; PROTEIN-PHOSPHORYLATION; SPINACH-CHLOROPLASTS; THERMO-LUMINESCENCE; EXCITATION-ENERGY; LIGHT UTILIZATION; OXYGEN EVOLUTION AB The oxygen Rash yield (Y-o2) and photochemical yield of PS II (Phi(PS II)) were simultaneously detected in intact chlorella cells on a bare platinum oxygen rate electrode. The two yields were measured as a function of background irradiance in the steady-state and following a transition from light to darkness. During steady-state illumination at moderate irradiance levels, Y-O2 and Phi(PS) (II) followed each other, suggesting a close coupling between the oxidation of water and QA reduction (Falkowski et al. (1988) Biochim. Biophys. Acta 933: 432-443). Following a light-to-dark transition, however, the relationship between QA reduction and the fraction of PS II reaction centers capable of evolving O-2 became temporarily uncoupled. Phi(PS) (II) recovered to the preillumination levels within 5-10 s, while the Y-O2 required up to 60 s to recover under aerobic conditions. The recovery of Y-O2 was independent of the redox state of Q(A), but was accompanied by a 30% increase in the functional absorption cross-section of PS II (sigma(PS II)) The hysteresis between Y-O2 and the reduction of Q(A) during the light-to-dark transition was dependent upon the reduction level of the plastoquinone pool and does not appear to be due to a direct radiative charge back-reaction, but rather is a consequence of a transient cyclic electron flow around PS II. The cycle is engaged in vivo only when the plastoquinone pool is reduced. Hence, the plastoquinone pool can act as a clutch that disconnects the oxygen evolution from photochemical charge separation in PS II. C1 BROOKHAVEN NATL LAB, DEPT APPL SCI, DIV OCEANOG & ATMOSPHER SCI, UPTON, NY 11973 USA. ACAD SCI CZECH REPUBL, INST MICROBIOL, TREBON 37980, CZECH REPUBLIC. CARNEGIE INST WASHINGTON, DEPT PLANT BIOL, STANFORD, CA 94305 USA. RI Berry, Joseph/B-8211-2009; Prasil, Ondrej/H-2454-2014 OI Berry, Joseph/0000-0002-5849-6438; Prasil, Ondrej/0000-0002-0012-4359 NR 81 TC 104 Z9 104 U1 0 U2 12 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD JUN PY 1996 VL 48 IS 3 BP 395 EP 410 DI 10.1007/BF00029472 PG 16 WC Plant Sciences SC Plant Sciences GA VM632 UT WOS:A1996VM63200007 PM 24271480 ER PT J AU Dominguez, D AF Dominguez, D TI Vortex dynamics in disordered Josephson junction arrays: From plastic flow to flux flow SO PHYSICA B LA English DT Article; Proceedings Paper CT ICTP Workshop on Josephson Junction Arrays CY AUG 07-11, 1995 CL TRIESTE, ITALY SP ICTP, Trieste, Hitachi Ltd Japan, European Commiss, Brussels ID TRANSVERSE MAGNETIC-FIELD; CHARGE-DENSITY WAVES; POSITIONAL DISORDER; LINE LATTICE; VORTICES; SIMULATIONS; THRESHOLD; BEHAVIOR; MEDIA AB We study the dynamics of Josephson junction arrays with positional disorder and driven by an external current. We consider weak magnetic fields, corresponding to a frustration f = n + 1/25 with n integer. We find that above the critical current i(c) there is a plastic flow of vortices, where most of the vortices are pinned and only a few vortices flow through channels. This dynamical regime is characterized by strong fluctuations of the total vorticity. The number of the flow channels grow with increasing bias current. At larger currents there is a dynamical regime characterized by the homogeneous motion of all the vortices, i.e. a flux flow regime. We find a dynamical phase transition between the plastic flow and the flux flow regimes when analyzing voltage-voltage correlation functions. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RI Dominguez, Daniel/E-9304-2016 OI Dominguez, Daniel/0000-0002-6204-0150 NR 31 TC 8 Z9 8 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 JUN PY 1996 VL 222 IS 4 BP 293 EP 298 DI 10.1016/0921-4526(96)00208-6 PG 6 WC Physics, Condensed Matter SC Physics GA UW437 UT WOS:A1996UW43700008 ER PT J AU GronbechJensen, N Dominguez, D Bishop, AR AF GronbechJensen, N Dominguez, D Bishop, AR TI Simulations of current: Driven three-dimensional Josephson junction arrays SO PHYSICA B LA English DT Article; Proceedings Paper CT ICTP Workshop on Josephson Junction Arrays CY AUG 07-11, 1995 CL TRIESTE, ITALY SP ICTP, Trieste, Hitachi Ltd Japan, European Commiss, Brussels ID HIGH-TEMPERATURE SUPERCONDUCTORS; CURRENT-VOLTAGE CHARACTERISTICS; HIGH-TC SUPERCONDUCTORS; PHASE-TRANSITIONS; XY-MODEL; VORTEX; CROSSOVER; BI2SR2CACU2O8-Y; ENTANGLEMENT; FLUCTUATIONS AB We present Langevin simulations of anisotropic three-dimensional Josephson arrays driven by an external current. We study the superconducting phase transition at zero magnetic field, by analyzing both the helicity modulus and the voltage. We find that there is a well defined phase transition at any finite current smaller than the Josephson critical current. The critical temperature T-c(I) obtained decreases linearly with current I. We also find that the onset of voltage occurs at temperatures smaller than T-c(I). We discuss the consequences of this result for the interpretation of recent experiments in the flux transformer configuration. RP GronbechJensen, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS-B262,LOS ALAMOS,NM 87545, USA. NR 26 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 JUN PY 1996 VL 222 IS 4 BP 396 EP 400 DI 10.1016/0921-4526(96)00224-4 PG 5 WC Physics, Condensed Matter SC Physics GA UW437 UT WOS:A1996UW43700026 ER PT J AU DeLong, L Childers, J Olinger, A Hou, JC Lahaise, U Zhang, J Hinks, DG Canfield, PC Schweinfurth, R VanHarlingen, D Norton, M AF DeLong, L Childers, J Olinger, A Hou, JC Lahaise, U Zhang, J Hinks, DG Canfield, PC Schweinfurth, R VanHarlingen, D Norton, M TI High-sensitivity vibrating reed studies of superconductors SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID NARROW-BAND METALS; MAGNETIC ORDER; HONI2B2C; CERU2; HEAT AB Recent improvements in the vibrating reed (VR) technique permit precision studies of the mixed state of complex superconducting materials far below the upper critical magnetic field H(c2) VR data for thin film, crystalline and ceramic (Ba(0.6)K(0.4))BiO(3) samples demonstrate the sensitivity of the VR to microstructure and inhomogeneities, and a study of HoNi(2)B(2)C reveals previously inaccessible vortex dynamical anomalies and minute details of a complex phase competition between magnetism and reentrant superconductivity. CeRu(2) VR data are reversible near H(c2) where giant hysteresis is observed in DC magnetization data, but are hysteretic over an extended region at lower temperatures and fields, indicating vortex dynamics must be considered in testing the existence of unconventional pairing states proposed for this system. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA. MARSHALL UNIV, DEPT CHEM, HUNTINGTON, WV 25701 USA. RP DeLong, L (reprint author), UNIV KENTUCKY, DEPT PHYS & ASTRON, LEXINGTON, KY 40506 USA. RI Canfield, Paul/H-2698-2014 NR 34 TC 11 Z9 11 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 JUN PY 1996 VL 223-24 IS 1-4 BP 22 EP 27 DI 10.1016/0921-4526(96)00029-4 PG 6 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200005 ER PT J AU Lynn, JW Huang, Q Sinha, SK Hossain, Z Gupta, LC Nagarajan, R Godard, C AF Lynn, JW Huang, Q Sinha, SK Hossain, Z Gupta, LC Nagarajan, R Godard, C TI Neutron scattering study of antiferromagnetic order in the magnetic superconductors RNi(2)B(2)C SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID HONI2B2C AB Neutron diffraction has been used to investigate the magnetic order and crystallography of RNi(2)B(2)C. For R=Dy the magnetic order that develops at 10 K consists of ferromagnetic sheets of spins in the tetragonal a-b plane which are stacked antiferromagnetically along the c-axis. An identical magnetic order is observed for R = Ho at low T, while from similar to 5 K to T(N) approximate to 8 K each layer along the c-axis is rotated by 163 degrees to form a spiral state, which strongly couples the magnetic order to the superconductivity. Small a-axis peaks are also observed in a narrow temperature range, but the c-axis peaks are dominant. In ErNi(2)B(2)C (T(c)=11 K) an antiferromagnetic a-axis spin density wave state develops below T(N)=6.8 K, which readily coexists with the superconductivity indicating that weak coupling occurs between this type of magnetic state and the superconducting state. There is no evidence of magnetic order for either R=Ce or R=Y. C1 ARGONNE NATL LAB, ADV PHOTON SOURCE, ARGONNE, IL 60439 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. CNRS, UPR 209, F-92195 MEUDON, FRANCE. RP Lynn, JW (reprint author), NATL INST STAND & TECHNOL, DIV REACTOR RADIAT, GAITHERSBURG, MD 20899 USA. NR 17 TC 18 Z9 19 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 JUN PY 1996 VL 223-24 IS 1-4 BP 66 EP 68 DI 10.1016/0921-4526(96)00040-3 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200016 ER PT J AU Blundell, SJ Brown, SR Chow, KH Cooke, DW Cox, SFJ Cottrell, SP Godart, C Gupta, LC Hossain, Z Lichti, RL MorrobelSosa, A Mazumdar, C Nagarajan, R Pattenden, PA Pratt, FL Smith, JL AF Blundell, SJ Brown, SR Chow, KH Cooke, DW Cox, SFJ Cottrell, SP Godart, C Gupta, LC Hossain, Z Lichti, RL MorrobelSosa, A Mazumdar, C Nagarajan, R Pattenden, PA Pratt, FL Smith, JL TI Interplay of magnetism and superconductivity in thulium and lutetium nickel-borocarbides SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID LUNI2B2C; SYSTEM; FIELD; MUON AB Implanted muon spectroscopy shows that magnetic order coexists with superconductivity in TmNi(2)B(2)C. The muon response indicates that large amplitude fluctuations of the internal field are superimposed on a relatively small static component. The static field exhibits an unusual temperature dependence which shows no interruption at the superconducting transition and may represent evolution of a staggered or spiral arrangement of Tm moments. The dynamic component changes its spectral density at the superconducting transition and the question arises as to whether this is associated with Ni moment formation and fluctuation. In LuNi(2)B(2)C, where the rare earth ion is nonmagnetic, no signature of static order is seen. An intriguing change in the muon response does occur below about 4 K in this material; this seems suggestive of Ni moment fluctuation, although the evidence is not entirely conclusive. C1 ISIS, RUTHERFORD APPLETON LAB, CHILTON OX11 0QX, OXON, ENGLAND. UNIV OXFORD, CLARENDON LAB, OXFORD OX1 3PU, ENGLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV LONDON UNIV COLL, LONDON WC1E 6BT, ENGLAND. CNRS, UPR 209, F-92195 MEUDON, FRANCE. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. TEXAS TECH UNIV, DEPT PHYS, LUBBOCK, TX 79409 USA. CALIF POLYTECH STATE UNIV SAN LUIS OBISPO, SAN LUIS OBISPO, CA 93407 USA. INDIAN INST TECHNOL, BOMBAY 400076, MAHARASHTRA, INDIA. NR 21 TC 6 Z9 6 U1 1 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 JUN PY 1996 VL 223-24 IS 1-4 BP 69 EP 71 DI 10.1016/0921-4526(96)00041-5 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200017 ER PT J AU Rathnayaka, KDD Bhatnagar, AK Naugle, DG Canfield, PC Cho, BK AF Rathnayaka, KDD Bhatnagar, AK Naugle, DG Canfield, PC Cho, BK TI Normal state transport properties of single crystal RNi(2)B(2)C (R=Y,Ho,Tm) magnetic superconductors SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID BORIDE CARBIDE; LUNI2B2C; HEAT AB Measurements of in-plane resistivity and thermopower for single crystal Y(Ho, Tm)Ni(2)B(2)C magnetic superconductors show a metallic resistivity and negative thermopower. C1 TEXAS A&M UNIV, COLLEGE STN, TX 77843 USA. UNIV HYDERABAD, DEPT PHYS, HYDERABAD, ANDHRA PRADESH, INDIA. IOWA STATE UNIV SCI & TECHNOL, AMES, IA 50011 USA. AMES LAB, AMES, IA 50011 USA. RI Canfield, Paul/H-2698-2014; OI Bhatnagar, Anil/0000-0002-7998-2793 NR 17 TC 4 Z9 4 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 JUN PY 1996 VL 223-24 IS 1-4 BP 83 EP 85 DI 10.1016/0921-4526(96)00045-2 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200021 ER PT J AU Yelon, WB Hu, Z Paranthaman, M James, WJ Menon, L Malik, SK AF Yelon, WB Hu, Z Paranthaman, M James, WJ Menon, L Malik, SK TI Neutron diffraction studies on superconducting YNi2B2C at various temperatures SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay AB Neutron diffraction studies have been carried out on superconducting YN1(2)B(2)C (T(c) = 15.6 K) at various temperatures between 14 and 300 K to determine its structure, variation of cell constants and interatomic distances as a function of temperature. This compound crystallizes in the tetragonal structure at room temperature and there is no structure change in the temperature range investigated. The lattice parameter shows anomalous temperature dependence in the c-direction. C1 TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. UNIV MISSOURI, RES REACTOR, COLUMBIA, MO 65211 USA. OAK RIDGE NATL LAB, DIV CHEM & ANALYT SCI, OAK RIDGE, TN 37831 USA. UNIV MISSOURI, ROLLA, MO 65401 USA. RI Paranthaman, Mariappan/N-3866-2015 OI Paranthaman, Mariappan/0000-0003-3009-8531 NR 5 TC 5 Z9 5 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 JUN PY 1996 VL 223-24 IS 1-4 BP 105 EP 108 DI 10.1016/0921-4526(96)00052-X PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200028 ER PT J AU Chang, LJ Tomy, CV Paul, DMK Andersen, NH Yethiraj, M AF Chang, LJ Tomy, CV Paul, DMK Andersen, NH Yethiraj, M TI Neutron diffraction studies of Ho1-xYxNi2B2C compounds SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID HONI2B2C; SUPERCONDUCTIVITY; HEAT AB Neutron diffraction measurements have been carried out to investigate the nature of magnetic ordering in Ho(1-x)Y(x)Ni(2)B(2)C (x = 0, 0.1 and 0.2) compounds. HoNi(2)B(2)C shows a complex type of magnetic ordering below the superconducting transition, with a commensurate antiferromagnetic ordering of the Ho moments below 5 K and a modulation of the magnetic ordering along a- and/or c-direction between 5 K < T < 8.5 K. The substitution of Y for Ho alters the commensurate nature of the Ho ordering. In Ho(0.9)Y(0.1)Ni(2)B(2)C, satellite peaks corresponding to c-modulation appear below T(N) and exist down to 2 K, together with the principal Bragg peaks. However, when the Y concentration is increased to 20%, the principal Bragg peaks disappear and only the c-modulated satellite magnetic peaks are observed below T(N). C1 UNIV WARWICK, DEPT PHYS, COVENTRY CV4 7AL, W MIDLANDS, ENGLAND. RISO NATL LAB, DK-4000 ROSKILDE, DENMARK. ORNL, DIV SOLID STATE, OAK RIDGE, TN USA. RI Andersen, Niels/A-3872-2012 NR 14 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 119 EP 122 DI 10.1016/0921-4526(96)00056-7 PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200032 ER PT J AU Movshovich, R Graf, T Mandrus, D Hundley, MF Thompson, JD Fisher, RA Phillips, NE Smith, JL AF Movshovich, R Graf, T Mandrus, D Hundley, MF Thompson, JD Fisher, RA Phillips, NE Smith, JL TI Response of CeRh2Si2 to pressure SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID HEAVY; SUPERCONDUCTIVITY AB Under atmospheric pressure, GeRh(2)Si(2) orders antiferromagnetically at T(N) = 35 K, with magnetic entropy S = R In 2 associated with the ordered groundstate. Application of modest pressure (approximate to 9 kbar) to GeRh(2)Si(2) suppresses T(N) to near zero Kelvin, increases its Sommerfeld coefficient of specific heat by nearly a factor of 3.5 and induces some form of superconductivity below 400 mK which is depressed by a magnetic field at a rate of -80 mK/kG. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV AUTONOMA MADRID, DEPT FIS MAT CONDENSADA, E-28049 MADRID, SPAIN. OAK RIDGE NATL LAB, OAK RIDGE, TN USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY NATL LAB, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Mandrus, David/H-3090-2014 NR 19 TC 49 Z9 49 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 126 EP 130 DI 10.1016/0921-4526(96)00058-0 PG 5 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200034 ER PT J AU Gschneidner, KA Pecharsky, VK AF Gschneidner, KA Pecharsky, VK TI Cerium intermetallic compounds with two inequivalent crystallographic sites SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID HEAVY-FERMION; MAGNETIC ORDER; COEXISTENCE; BEHAVIOR; CE2SN5 AB The low-temperature properties of five cerium intermetallic compounds, Ce(2)Sn(5), CePtGe(2), Ce(5)Ni(6)In(11) and Ce(4-x)Ru(4)Ge(12+x) (with x = 0 and 1), which have two inequivalent cerium lattice sites, have been measured. The first three behave as trivalent systems at high temperatures (> 50 K) but at low temperatures they exhibit some unusual properties because of the different kinds of cerium-cerium interactions, including heavy fermion, intermediate valence and magnetic order. The Ce(4-x)Ru(4)Ge(12+x) system is unusual and displays a variety of behaviors such as heavy fermion, magnetic and non-magnetic atom disorder (MAD/NMAD) spin glass, and both tri- and tetravalency. The existence of independent trivalent and tetravalent cerium atoms in an intermetallic phase is unique and as far as we are aware this is the first time such a distinct valence situation has been reported for a cerium compound. Other cerium systems with multi-cerium sites reported by others are also briefly discussed. RP Gschneidner, KA (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 12 TC 15 Z9 15 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 131 EP 134 DI 10.1016/0921-4526(96)00059-2 PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200035 ER PT J AU Huxley, A Cubitt, R McPaul, D Forgan, E Nutley, M Mook, H Yethiraj, M Lejay, P Caplan, D Penisson, JM AF Huxley, A Cubitt, R McPaul, D Forgan, E Nutley, M Mook, H Yethiraj, M Lejay, P Caplan, D Penisson, JM TI A neutron study of the flux lattice in the superconductor CeRu2 SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID II SUPERCONDUCTORS; DIFFRACTION AB Small-angle neutron diffraction measurements from the flux lattice in a single crystal of the cubic Laves' phase superconductor, CeRu(2), are reported. The mixed state is described in terms of aligned rigid bundles of vortices. The bundle diameters decrease above 1/2H(c2) (consistent with collective weak pinning theory) and become comparable with the penetration length at a field at which a 'peak effect' is seen in magnetisation measurements. A clear memory of field histories that pass through the 'peak effect' region is also found; however, some of the induced disorder can be removed by subsequently cycling the field. C1 INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE 9, FRANCE. UNIV WARWICK, DEPT PHYS, COVENTRY CV4 7AL, W MIDLANDS, ENGLAND. UNIV BIRMINGHAM, SCH PHYS & SPACE RES, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP Huxley, A (reprint author), CEA, DEPT RECH FONDAMENTALE MAT CONDENSEE, SPSMS, F-38054 GRENOBLE 9, FRANCE. RI cubitt, robert/B-9408-2008 NR 8 TC 20 Z9 20 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 JUN PY 1996 VL 223-24 IS 1-4 BP 169 EP 171 DI 10.1016/0921-4526(96)00067-1 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200043 ER PT J AU Bull, MJ McEwen, KA Osborn, R Eccleston, RS AF Bull, MJ McEwen, KA Osborn, R Eccleston, RS TI Neutron intermultiplet spectroscopy of UPd3 and UPt3 SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID FERMION AB Neutron intermultiplet spectroscopy has been used to re-examine UPd(3) and UPt(3) at 17 K. In UPd(3), the (3)H(4) --> (3)F(2) transition is observed at 395 meV, confirming a localised 5f(2) state for the uranium ions. In the heavy fermion compound UPt(3), only a small trace of this transition remains, indicating that the 5f electrons in this material are of a predominantly itinerant nature. The Q dependence of the transition in UPd(3) has also been determined. The transition intensities are found to differ by a factor of similar to 2 from that predicted by calculations. C1 ARGONNE NATL LAB, DIV SCI MAT, ARGONNE, IL 60439 USA. RUTHERFORD APPLETON LAB, ISIS FACIL, DIDCOT OX11 0QX, OXON, ENGLAND. RP Bull, MJ (reprint author), UNIV LONDON BIRKBECK COLL, DEPT PHYS, LONDON WC1E 7HX, ENGLAND. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 16 TC 11 Z9 11 U1 0 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 JUN PY 1996 VL 223-24 IS 1-4 BP 175 EP 177 DI 10.1016/0921-4526(96)00069-5 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200045 ER PT J AU Lin, SW Kouroudis, I Jansen, AGM Wyder, P Luthi, B Hinks, DG Ketterson, JB Levy, M Sarma, BK AF Lin, SW Kouroudis, I Jansen, AGM Wyder, P Luthi, B Hinks, DG Ketterson, JB Levy, M Sarma, BK TI Ultrasonic studies on UPt3 in high magnetic fields SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID SYSTEMS AB The longitudinal ultrasonic attenuation and velocity on UPt(3) have been measured in high magnetic fields up to 23 T and temperatures down to 2 K to study the heavy-fermion state. Earlier measurements had reported an attenuation peak at 12 K in temperature sweeps that was interpreted as a resonance with a narrow density of states at the Fermi surface, and a large dip in the velocity around 20 T (a softening due to a metamagnetic transition). The field dependence of the attenuation peak, its shift to lower temperatures and eventual merging with the peak in attenuation at the metamagnetic transition are discussed. The velocity was also measured and complementary features observed. C1 NORTHWESTERN UNIV, DEPT PHYS, EVANSTON, IL 60208 USA. UNIV FRANKFURT, D-6000 FRANKFURT, GERMANY. MAX PLANCK INST SOLID STATE RES, HIGH FIELD MAGNET LAB, GRENOBLE, FRANCE. ARGONNE NATL LAB, DIV SCI MAT, ARGONNE, IL 60439 USA. UNIV WISCONSIN, DEPT PHYS, MILWAUKEE, WI 53201 USA. RI Ketterson, John/B-7234-2009 NR 8 TC 8 Z9 8 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 JUN PY 1996 VL 223-24 IS 1-4 BP 185 EP 188 DI 10.1016/0921-4526(96)00072-5 PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200048 ER PT J AU Prokes, K Nakotte, H Havela, L Sechovsky, V Pereira, LCJ Rijkeboer, C Seret, A Spirlet, JC Svoboda, P deBoer, FR AF Prokes, K Nakotte, H Havela, L Sechovsky, V Pereira, LCJ Rijkeboer, C Seret, A Spirlet, JC Svoboda, P deBoer, FR TI Magnetic anisotropy of U2Pd2In SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID ACTINIDE AB Magnetic susceptibility studies of the U(2)Pd(2)In single crystal show that in the paramagnetic state larger X-values are found for field along the basal plane than along the c-axis. However, below T(N) = 37 K, where U-moments form a non-collinear magnetic structure within the basal plane, a cross-over of the two chi-branches occurs. The single crystal results may explain the origin of the exotic magnetization results obtained on powder samples. C1 CHARLES UNIV, DEPT MET PHYS, PRAGUE 12116 2, CZECH REPUBLIC. UNIV AMSTERDAM, VAN DER WAALS ZEEMAN INST, NL-1018 XE AMSTERDAM, NETHERLANDS. COMMISS EUROPEAN COMMUNITIES, JOINT RES CTR, INST TRANSURANIUM ELEMENTS, D-76125 KARLSRUHE, GERMANY. LOS ALAMOS NATL LAB, LANSCE, LOS ALAMOS, NM 87545 USA. RI Pereira, Laura/G-3579-2013; Sechovsky, Vladimir/A-5256-2008 OI Pereira, Laura/0000-0002-8818-0039; Sechovsky, Vladimir/0000-0003-1298-2120 NR 4 TC 7 Z9 7 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 225 EP 227 DI 10.1016/0921-4526(96)00084-1 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200060 ER PT J AU Havela, L Sechovsky, V Prokes, K Nakotte, H Fujii, H Lacerda, A AF Havela, L Sechovsky, V Prokes, K Nakotte, H Fujii, H Lacerda, A TI Giant magnetoresistance effects in 5f-materials SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID MULTILAYERS; TRANSPORT AB Large magnetoresistance effects related to magnetic-moments reorientation were observed in numerous U-intermetallics, The resemblance to magnetic multilayers motivated our discussion of responsible mechanisms, in the background of which is probably the strong hybridization of 5f- and conduction-electron states. A clear cut evidence of relative contributions of varied scattering rate on the one hand and the carrier concentration on the other may be obtained from experiments on samples with controlled disorder. C1 UNIV AMSTERDAM, VAN DER WAALS ZEEMAN INST, NL-1018 XE AMSTERDAM, NETHERLANDS. LOS ALAMOS NATL LAB, LANSCE, LOS ALAMOS, NM 87545 USA. HIROSHIMA UNIV, FAC INTEGRATED ARTS & SCI, HIGASHIHIROSHIMA 724, JAPAN. LOS ALAMOS NATL LAB, NHMFL, LOS ALAMOS, NM 87545 USA. RP Havela, L (reprint author), CHARLES UNIV, DEPT MET PHYS, KE KARLOVU 5, PRAGUE 12116 2, CZECH REPUBLIC. RI Sechovsky, Vladimir/A-5256-2008 OI Sechovsky, Vladimir/0000-0003-1298-2120 NR 10 TC 12 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 245 EP 250 DI 10.1016/0921-4526(96)00090-7 PG 6 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200066 ER PT J AU Kebede, A Aronson, MC Buford, CM Canfield, PC Cho, JH Coles, BR Cooley, JC Coulter, JY Fisk, Z Goettee, JD Hults, WL Lacerda, A McLendon, TD Tiwari, P Smith, JL AF Kebede, A Aronson, MC Buford, CM Canfield, PC Cho, JH Coles, BR Cooley, JC Coulter, JY Fisk, Z Goettee, JD Hults, WL Lacerda, A McLendon, TD Tiwari, P Smith, JL TI Studies of the correlated electron system SmB6 SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID STATE AB We have prepared high-quality, single crystals of SmB(6) under various conditions to improve sample quality. We have measured the resistivity and magnetic susceptibility from room to liquid-helium temperatures to sort samples. We have applied pulsed magnetic fields as high as 50 T at temperatures as low as 40 mK while measuring resistivity. Our samples are of higher quality than previously known. All solvent-grown, single-crystal samples should be etched to remove a surface conductivity. C1 FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, TALLAHASSEE, FL 32306 USA. N CAROLINA AGR & TECH STATE UNIV, DEPT PHYS, GREENSBORO, NC 27411 USA. UNIV MICHIGAN, DEPT PHYS, ANN ARBOR, MI 48109 USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. RI Cooley, Jason/E-4163-2013; Canfield, Paul/H-2698-2014; Goettee, Jeffrey/L-4926-2015 NR 13 TC 23 Z9 23 U1 1 U2 17 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 256 EP 259 DI 10.1016/0921-4526(96)00092-0 PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200068 ER PT J AU Coles, BR AF Coles, BR TI 3d heavy fermions: Do they exist? SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay AB Dilute intermetallic compounds of 3d elements are compared with those of 4f and 5f elements showing Kondo or intermediate valence character. New results on Co-Zn intermetallics are presented which show that anomalous low temperature behaviour of susceptibility and specific heat can be found even when the latter is very small because of nearly full Brillouin zone character. A distinction is drawn between Kondo insulators and hybridization insulators, with special reference to FeSi and RuAl(2). C1 LOS ALAMOS NATL LAB, CTR SUPERCONDUCT RES, LOS ALAMOS, NM 87545 USA. RP Coles, BR (reprint author), UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7, ENGLAND. NR 9 TC 2 Z9 2 U1 0 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 JUN PY 1996 VL 223-24 IS 1-4 BP 260 EP 261 DI 10.1016/0921-4526(96)00093-2 PG 2 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200069 ER PT J AU Sarrao, JL Benton, CL Fisk, Z Lawrence, JM Mandrus, D Thompson, JD AF Sarrao, JL Benton, CL Fisk, Z Lawrence, JM Mandrus, D Thompson, JD TI YbIn1-xAgxCu4: Crossover from first-order valence transition to heavy Fermion behavior SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID PHASE-TRANSITION; MAGNETIC-SUSCEPTIBILITY; YBXIN1-XCU2 AB The results of an on-going study of YbIn(1-x)Ag(x)Cu(4) are presented. YbInCu(4) undergoes a first-order valence transition at 40 K, while YbAgCu(4) is an isostructural heavy Fermion compound. We have succeeded in growing single crystals of these compounds, as well as intermediate alloys, using flux-growth techniques. A smooth evolution from YbInCu(4) to YbAgCu(4) is observed. Results on the influence of sample quality, as well as the effect of other dopants, on the valence transition in YbInCu(4) are also discussed. C1 UNIV CALIF IRVINE, DEPT PHYS, IRVINE, CA 92717 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP Sarrao, JL (reprint author), FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, 1800 E PAUL DIRAC DR, TALLAHASSEE, FL 32306 USA. RI Mandrus, David/H-3090-2014 NR 13 TC 24 Z9 24 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 JUN PY 1996 VL 223-24 IS 1-4 BP 366 EP 369 DI 10.1016/0921-4526(96)00124-X PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200100 ER PT J AU Martins, GB Rao, D Barberis, GE Rettori, C Duro, RJ Sarrao, J Fisk, Z Oseroff, S Thompson, JD AF Martins, GB Rao, D Barberis, GE Rettori, C Duro, RJ Sarrao, J Fisk, Z Oseroff, S Thompson, JD TI Electron spin resonance of Er3+ in YBiPt SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID MAGNETISM; YBBIPT AB Electron spin resonance (ESR) experiments at 4.15 K of Er(3+) in YBiPt show that Er(3+) is in a site of cubic local symmetry, with a Gamma(8)((3)) ground state and an overall crystal field splitting of similar to 85(10) K. We inferred from the spectra the existence of lattice distortions at the rare-earth (RE) site. These results may help in understanding the heavy-fermion system YbBiPt, which has the same structure as YBiPt. C1 UNIV ESTADUAL CAMPINAS, INST FIS GLEB WATAGHIN, BR-13083970 SAO PAULO, BRAZIL. UNIV LA CORUNA, DEPT INGN IND, E-15403 FERROL, SPAIN. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, TALLAHASSEE, FL 32306 USA. SAN DIEGO STATE UNIV, DEPT PHYS, SAN DIEGO, CA 92182 USA. RI Rettori, Carlos/C-3966-2012; 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 13 TC 3 Z9 3 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 396 EP 398 DI 10.1016/0921-4526(96)00133-0 PG 3 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200109 ER PT J AU Fisk, Z Sarrao, JL Cooper, SL Nyhus, P Boebinger, GS Passner, A Canfield, PC AF Fisk, Z Sarrao, JL Cooper, SL Nyhus, P Boebinger, GS Passner, A Canfield, PC TI Kondo insulators SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID HYBRIDIZATION GAP; CHARGE GAP; CE3BI4PT3; CENISN; FESI; SPECTRUM; SYSTEM AB We discuss Kondo insulators in the context of recent experimental results. These experiments address the questions of the relationship of spin and charge excitations, the temperature dependence of the gap, and the existence of 'failed' insulators. C1 UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA. AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. AMES RES LAB, AMES, IA 50010 USA. RP Fisk, Z (reprint author), FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, 1800 E PAUL DIRAC DR, TALLAHASSEE, FL 32306 USA. RI Canfield, Paul/H-2698-2014 NR 30 TC 59 Z9 59 U1 3 U2 27 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 409 EP 412 DI 10.1016/0921-4526(96)00136-6 PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200112 ER PT J AU Maple, MB Gajewski, DA Chau, R Dai, P Mook, HA Movshovich, R Seaman, CL AF Maple, MB Gajewski, DA Chau, R Dai, P Mook, HA Movshovich, R Seaman, CL TI Fermi- and non-Fermi-liquid ground states in M(1-x)U(x)Pd(3) (M=Sc, Y, La, Pr, Zr, Th) systems SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 95) CY SEP 27-30, 1995 CL GOA, INDIA SP Tata Inst Fundamental Res, Bombay ID KONDO; Y1-XUXPD3; BEHAVIOR; ALLOYS AB A growing number of chemically substituted intermetallic compounds of Ce and U exhibit non-Fermi-liquid (NFL) behavior in their low temperature physical properties and apparently constitute a new class of strongly correlated f-electron materials. In this paper, we update the experimental situation for the archetypal NFL f-electron system Y1-xUxPd3 and briefly describe recent experiments on the related systems M1-xUxPd3 (M = Sc, La, Pr, Zr, Th). C1 UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, LA JOLLA, CA 92093 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87845 USA. ENERGY SCI LABS INC, SAN DIEGO, CA 92121 USA. RP Maple, MB (reprint author), UNIV CALIF SAN DIEGO, DEPT PHYS, 9500 GILMAN DR, LA JOLLA, CA 92093 USA. RI Dai, Pengcheng /C-9171-2012 OI Dai, Pengcheng /0000-0002-6088-3170 NR 23 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 447 EP 452 DI 10.1016/0921-4526(96)00146-9 PG 6 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200122 ER PT J AU Alvarenga, AD Rao, D Sanjurjo, JA Granado, E Torriani, I Rettori, C Oseroff, S Sarrao, J Fisk, Z AF Alvarenga, AD Rao, D Sanjurjo, JA Granado, E Torriani, I Rettori, C Oseroff, S Sarrao, J Fisk, Z TI Raman and weak ferromagnetism in Eu2CuO4 SO PHYSICA B-CONDENSED MATTER LA English DT Article ID R2CUO4 COMPOUNDS; SCATTERING; SUPERCONDUCTIVITY; GD2CUO4; TB; DY; HO; ER; TM AB We show that there is a subtle instability of the T' structure for the R2CuO4 (R = rare earth) compounds at the center of the R series with the boundary at R = Eu. Crystals grown in Pt crucibles and PbO flux show weak ferromagnetism (WF) and two temperature-dependent forbidden Raman peaks. Crystals grown in alumina crucibles and CuO flux do not show WF and the forbidden Raman peaks are much weaker. The WF and forbidden Raman peaks in Eu2CuO4 suggests that the instability of the T' structure is associated with O(1) displacement in the CuO2 planes. C1 UNIV ESTADUAL CAMPINAS, INST FIS GLEB WATAGHIN, BR-13083970 CAMPINAS, BRAZIL. SAN DIEGO STATE UNIV, SAN DIEGO, CA 92182 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, TALLAHASSEE, FL 32306 USA. RI Rettori, Carlos/C-3966-2012; Granado, Eduardo/F-5389-2012; Torriani, Iris/E-5686-2010; Alvarenga, Ana Paula/M-9790-2014; Inst. of Physics, Gleb Wataghin/A-9780-2017 OI Rettori, Carlos/0000-0001-6692-7915; NR 17 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD JUN PY 1996 VL 223-24 IS 1-4 BP 522 EP 525 DI 10.1016/0921-4526(96)00162-7 PG 4 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200138 ER PT J AU Thompson, JD AF Thompson, JD TI Conference summary: Experimental SO PHYSICA B-CONDENSED MATTER LA English DT Editorial Material AB A brief summary is given of experimental results presented al SCES'95. RP Thompson, JD (reprint author), LOS ALAMOS NATL LAB, MS K764, LOS ALAMOS, NM 87545 USA. NR 29 TC 6 Z9 6 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 JUN PY 1996 VL 223-24 IS 1-4 BP 643 EP 648 DI 10.1016/0921-4526(96)00198-6 PG 6 WC Physics, Condensed Matter SC Physics GA UX822 UT WOS:A1996UX82200175 ER PT J AU Sengupta, S Todt, VR Kostic, P Chen, YL Lanagan, MT Goretta, KC AF Sengupta, S Todt, VR Kostic, P Chen, YL Lanagan, MT Goretta, KC TI Flux pinning in TlBa2Ca2Cu3Ox through addition of nanophase Al2O3 SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; MELT-PROCESSED YBA2CU3OX; CRITICAL CURRENT-DENSITY; CU-O SYSTEM; TEXTURED YBA2CU3OX; TAPES; ENHANCEMENT; DEFECTS; BI2SR2CACU2OX; CERAMICS AB Nanophase Al2O3 powders were added to TlBa2Ca2Cu2Ox powders in 20 mol.% concentrations. Pellets produced from powders with and without nanophase oxides were heated in O-2 above the peritectic melting temperatures and cooled at 10 degrees C/h. For temperatures less than or equal to 35 K, the intragranular critical current density, J(c), increased dramatically for all specimens with the Al2O3 additions, However, no significant changes in J(c) with Al2O3 additions were observed at 77 K. The enhancement in J(c) appears to be associated with the presence of nanometer-sized inclusions in the superconductor. The pinning by the inclusions can be understood by considering the interaction between flux lines and cavities. It is shown that for pinning by such cavities to be effective, the cavities must be small, numerous, and well-distributed. C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SUPERCONDUCT COMPONENTS INC,COLUMBUS,OH 43212. NR 37 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1996 VL 264 IS 1-2 BP 34 EP 42 DI 10.1016/0921-4534(96)00191-8 PG 9 WC Physics, Applied SC Physics GA UX197 UT WOS:A1996UX19700006 ER PT J AU Kini, AM Carlson, KD Wang, HH Schlueter, JA Dudek, JD Sirchio, SA Geiser, U Lykke, KR Williams, JM AF Kini, AM Carlson, KD Wang, HH Schlueter, JA Dudek, JD Sirchio, SA Geiser, U Lykke, KR Williams, JM TI Determination of a mass isotope effect on T-c in an electron-donor-based organic superconductor, kappa-(ET)(2)Cu(NCS)(2), where ET represents bis(ethylenedithio)tetrathiafulvalene SO PHYSICA C LA English DT Article ID BEDT-TTF; AMBIENT-PRESSURE; KAPPA-(ET)2X SUPERCONDUCTORS; PAIRING MECHANISM; KAPPA-(BEDT-TTF)2CUBR; SUBSTITUTION; (BEDT-TTF)2CU(NCS)2; BEHAVIOR; ATOMS; T(C) AB We describe the first determination of a genuine mass isotope effect on T-c arising from the isotopic substitution of atoms in the ET [bis(ethylenedithio)tetrathiafulvalene] molecule of an electron-donor-based organic superconductor, kappa(ET)(2)Cu(NCS)(2) (T-c = 9.6 K, inductive onset). The isotopic substitution in the ET molecule involves concurrent replacement of the four carbon atoms in the terminal 1,2-ethanediyl groups with C-13 and all eight sulfur atoms with S-34. This substitution, C-13(4)S-34(8), increases the mass of the ET molecule by 20 amu, which is a 5% increase in the normal mass. With the use of AC susceptibility measurements on a large sampling of single crystals, including both undeuterated and fully deuterated salts, we obtain Delta T-c = -0.12+/-0.05 K for this isotope effect. Assuming a BCS-like mass effect with ET as the relevant mass entity (M), this effect gives alpha = 0.26+/-0.11 for T-c proportional to M(-alpha). Additionally, our experiments with fully deuterated kappa-(ET)(2)Cu(NCS)(2) (H-2 replacing eight hydrogen atoms in ET) confirm the occurrence of a large inverse isotope effect for the deuteration, and yield the first definitive value for this effect, Delta T-c = +0.28+/-0.06 K. The isotope effect for C-13(4)S-34(8) substitution, however, is unaffected by deuteration. Contrary to an earlier report by others, we find a zero isotope effect within +/-0.06 K for C-13(4) substitution alone. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP Kini, AM (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 34 TC 42 Z9 42 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 JUN 1 PY 1996 VL 264 IS 1-2 BP 81 EP 94 DI 10.1016/0921-4534(96)00237-7 PG 14 WC Physics, Applied SC Physics GA UX197 UT WOS:A1996UX19700010 ER PT J AU Oxx, S Choudhury, DP Willemsen, BA Srikanth, H Sridhar, S Cho, BK Canfield, PC AF Oxx, S Choudhury, DP Willemsen, BA Srikanth, H Sridhar, S Cho, BK Canfield, PC TI Vortex response and critical fields observed via RF penetration depth measurements on the superconductor YNi2B2C SO PHYSICA C LA English DT Article DE borocarbide superconductors; penetration depth; lower critical field; upper critical field; flux pinning ID II SUPERCONDUCTORS; TEMPERATURE-DEPENDENCE; YBA2CU3OY CRYSTALS AB Measurements of the RF penetration depth lambda(T, H, theta) are used to study the superconducting order parameter, vortex dynamics in the mixed state and delineate critical fields in the borocarbide superconductor YNi2B2C. The lower critical field has an anomalous T dependence, H-cl(T) = 1.12[1 - (T/T-c)]kOe, which is, however, consistent with independent superfluid density measurements at microwave frequencies. The vortex response is dominated by viscous flux flow, indicative of extremely weak pinning, and is parameterized by a field scale H-c2,H-eff. The angular dependence of the vortex contribution lambda(theta) is in good agreement with the Coffey-Clem model. Structure is seen in the depairing transition in the vicinity of the upper critical field, with the existence of well-defined critical fields H-c2 alpha, H-c2 beta and H-c2 gamma with the vortex field scale H-c2,H-eff closest to H-c2 beta. Overall the measurements indicate that YNi2B2C has a rich and unusual field dependence of its transport parameters. C1 NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115. IOWA STATE UNIV,AMES LAB,AMES,IA 50011. RI Sridhar, Srinivas/A-3688-2012; Canfield, Paul/H-2698-2014 NR 19 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1996 VL 264 IS 1-2 BP 103 EP 108 DI 10.1016/0921-4534(96)00230-4 PG 6 WC Physics, Applied SC Physics GA UX197 UT WOS:A1996UX19700012 ER PT J AU Margulies, L Dennis, KW Hofer, RJ Kramer, MJ McCallum, RW AF Margulies, L Dennis, KW Hofer, RJ Kramer, MJ McCallum, RW TI The effect of carbon on the peritectic melting of Bi2212 and Bi2212+Ag SO PHYSICA C LA English DT Article ID CA-CU-O AB The effect of C content on the decomposition temperature of Bi2Sr2CaCu2O8 (Bi2212) with 0 and 10 wt.% Ag added was investigated in atmospheres of 0.01, 0.21 and 1.00 bar oxygen. The C content of the samples was controlled by a high-temperature heat treatment and subsequent exposure to H2O saturated air. It was found that an increase in C content from 30 ppm to 7000 ppm suppressed the decomposition temperature of Bi2212 by only 3 degrees C independent of Ag content. Furthermore, it was found that the previously observed suppression of the decomposition temperature with the addition of Ag was unaffected by changes in the C concentration from 80 to 1500 ppm. RP Margulies, L (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. NR 11 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1996 VL 264 IS 1-2 BP 133 EP 136 DI 10.1016/0921-4534(96)00248-1 PG 4 WC Physics, Applied SC Physics GA UX197 UT WOS:A1996UX19700016 ER PT J AU Abdallah, J Faenov, AY Hammer, D Pikuz, SA Csanak, G Clark, REH AF Abdallah, J Faenov, AY Hammer, D Pikuz, SA Csanak, G Clark, REH TI Electron beam effects on the spectroscopy of satellite lines in aluminum X-pinch experiments SO PHYSICA SCRIPTA LA English DT Article ID OPACITY; HOT AB Aluminum wire X-pinch experiments performed at the Cornell University XP pulsed power generator show detailed high resolution spectra for satellite lines of Li-like, Be-like, B-like and C-like ions. These lines, which correspond to transitions originating from autoionizing levels, are observed in the direction of the anode with respect to the hot X-pinch cross point. The intensities of such satellites are much smaller or absent in the direction of the cathode. These transitions are caused by collisions of ions with energetic electrons (5-15 keV) which are created by inductance between the hot spot and the anode. A collisional-radiative model was constructed using a non-Maxwellian electron energy distribution consisting of a thermal Maxwellian part plus a Gaussian part to represent the high energy electron beam. The shapes of the observed satellite structures are consistent with the calculated spectrum for electron temperatures between 30-100 eV, and beam densities of about 10(-7) times the plasma electron density. C1 MISDC,NPO VNIIFTRI,MENDELEYEVSK 141570,RUSSIA. CORNELL UNIV,ITHACA,NY. PN LEBEDEV PHYS INST,MOSCOW 117924,RUSSIA. RP Abdallah, J (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. RI Pikuz, Sergey/M-8231-2015 NR 19 TC 40 Z9 40 U1 0 U2 0 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD JUN PY 1996 VL 53 IS 6 BP 705 EP 711 DI 10.1088/0031-8949/53/6/011 PG 7 WC Physics, Multidisciplinary SC Physics GA UQ136 UT WOS:A1996UQ13600011 ER PT J AU Beiersdorfer, P Vogel, DA Reed, KJ Decaux, V Scofield, JH Widmann, K Holzer, G Forster, E Wehrhan, O Savin, DW Schweikhard, L AF Beiersdorfer, P Vogel, DA Reed, KJ Decaux, V Scofield, JH Widmann, K Holzer, G Forster, E Wehrhan, O Savin, DW Schweikhard, L TI Measurement and interpretation of the polarization of the x-ray line emission of heliumlike Fe XXV excited by an electron beam SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; HE-LIKE IONS; SOLAR-FLARES; EXCITATION; RADIATION; SUBLEVELS; TRAP AB The linear polarization of the 1s2p P-1(1)-->1s(2 1)S(0) resonance line, the 1s2p P-3(1,2)-->1s(2 1)S(0) intercombination lines, and the 1s2s S-3(1)-->1s(2 1)S(0) forbidden line was measured in heliumlike Fe XXV excited near threshold by a monoenergetic electron beam. The measurement was carried out with a high-resolution x-ray spectrometer employing a set of two analyzing crystals that acted as polarizers by selectively reflecting the individual polarization components. A value of +0.56(-0.08)(+0.17) was determined for the polarization of the P-1(1) line,-0.53(-0.02)(+0.05) for the P-3(2) line, -0.22(-0.02)(+0.05) for the P-3(1) line, and -0.076(-0.007)(+0.007) for the S-3(1) line. The measurments were compared with results from a relativistic distorted-wave calculation, which was carried out for a number of mid-Z heliumlike ions (Mg10+-Kr34+), and good agreement was found. By contrast, disagreement was noted with predictions based on Coulomb-Born calculations, allowing us to distinguish between theoretical approaches. C1 UNIV JENA,MAX PLANCK ARBEITSGRP RONTGENOPT,D-07743 JENA,GERMANY. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV MAINZ,INST PHYS,D-55099 MAINZ,GERMANY. RP Beiersdorfer, P (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS & SPACE TECHNOL,LIVERMORE,CA 94550, USA. RI Savin, Daniel/B-9576-2012 OI Savin, Daniel/0000-0002-1111-6610 NR 32 TC 93 Z9 97 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1996 VL 53 IS 6 BP 3974 EP 3981 DI 10.1103/PhysRevA.53.3974 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500039 ER PT J AU Beiersdorfer, P Elliott, SR Osterheld, A Stohlker, T Autrey, J Brown, GV Smith, AJ Widmann, K AF Beiersdorfer, P Elliott, SR Osterheld, A Stohlker, T Autrey, J Brown, GV Smith, AJ Widmann, K TI Search for 1s2s S-3(1)-1s2p P-3(2) decay in U90+ SO PHYSICAL REVIEW A LA English DT Article ID BEAM ION-TRAP; HELIUM-LIKE; LAMB SHIFT; STATES AB We present high-resolution crystal-spectrometer measurements that cover the wavelength range 3.0-3.2 Angstrom containing the electric-dipole-allowed 2s(1/2)-2p(3/2) transitions in highly charged uranium ions. Strong features from 2s(1/2)-2p(3/2) transitions in lithiumlike, berylliumlike, and boronlike uranium were observed. In addition, a weak feature with intensity just above the level of background fluctuations was observed at the predicted location of the 1s2s S-3(1)-1s2p P-3(2) transition in heliumlike U90+. The feature was observed in spectra where the intensity of the 2s(1/2)-2p(3/2) transition in lithiumlike uranium, and thus the ionization balance, was optimized; it appeared absent in spectra where the average ionization balance was lower. The measured energy of the feature is 4510.05+/-0.24 eV, which agrees closely with the values predicted for the 1s2s S-3(1)-1s2p P-3(2) transition by recent theories. Detailed spectral modeling calculations indicate the possibility that a weak transition in berylliumlike U88+ is situated within 4 eV of the-location of the heliumlike S-3(1)-P-3(2) transition. This transition connects the level 1s (2)2p(1/2)2p(3/2) (3)p(1) with the 1s (2)2s(1/2)2p(1/2) P-3(0) metastable ground level in berylliumlike uranium. The accuracy with which the energy of the berylliumlike transition can be predicted is insufficient to rule out a blend with the heliumlike S-3(1)-P-3(2) transition. C1 GESELL SCHWERIONENFORSCH MBH,D-64220 DARMSTADT,GERMANY. MOREHOUSE COLL,DEPT PHYS,ATLANTA,GA 30314. AUBURN UNIV,DEPT PHYS,AUBURN,AL 36839. RP Beiersdorfer, P (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS & SPACE TECHNOL,LIVERMORE,CA 94550, USA. NR 21 TC 7 Z9 7 U1 1 U2 1 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 JUN PY 1996 VL 53 IS 6 BP 4000 EP 4006 DI 10.1103/PhysRevA.53.4000 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500043 ER PT J AU Bliman, S Bruch, R Altick, PL Schneider, D Prior, MH AF Bliman, S Bruch, R Altick, PL Schneider, D Prior, MH TI Double electron capture in low-energy Fe17++He collisions SO PHYSICAL REVIEW A LA English DT Article ID FINE-STRUCTURE; ION IMPACT; ATOMS; EXCITATION; SPECTRA; HE; NE AB Double electron transfer processes for the system Fe17+ + He have been studied utilizing high-resolution Auger electron spectroscopy. A thorough analysis of the experimental conditions (single collision condition and metastable fraction content at the incident ion beam and their influence) has been performed, leading to the following conclusions. The double capture leads to the preferential population of 2p(5)5l8l' configurations sharing their decay between Auger processes and radiative cascade transitions. The observed sodiumlike ''quartet'' and ''doublet'' states result from cascade contributions from higher-lying levels. Tentative mechanisms for the production of the quartet states are suggested using a spin-flip model. C1 UNIV NEVADA,DEPT PHYS,RENO,NV 89557. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550. RP Bliman, S (reprint author), UNIV MARNE LA VALLEE,DEPT PHYS,2 RUE LA BUTTE VERTE,F-93166 NOISY LE GRAND,FRANCE. NR 31 TC 10 Z9 10 U1 2 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 JUN PY 1996 VL 53 IS 6 BP 4176 EP 4182 DI 10.1103/PhysRevA.53.4176 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500064 ER PT J AU Feigerle, CS Compton, RN Cuellar, LE Cherepkov, NA Chernysheva, LV AF Feigerle, CS Compton, RN Cuellar, LE Cherepkov, NA Chernysheva, LV TI Circular-dichroism effects on photoelectron angular distributions for the 7P and 8P states of cesium SO PHYSICAL REVIEW A LA English DT Article ID MULTIPHOTON IONIZATION; PHOTOFRAGMENT ALIGNMENT; MOLECULAR ALIGNMENT; EXCITED-STATES; ALKALI ATOMS; POLARIZATION; CDAD; NO AB Circular dichroism in the photoelectron angular distribution (CDAD) of the 7P(J) and 8P(J) states of cesium have been measured using plane-polarized light to excite and align the atoms and alternately right- and left-circularly polarized light to ionize them. The experiments are compared with the results of theory, calculated using the Hartree-Fock wave functions with many electron correlations included in the random-phase approximation with exchange. A comparison of theory and experiment allows information on the alignment of the resonant state to be extracted from the experimental data. No CDAD effect is observed for the nP(1/2) states that cannot be aligned, whereas CDAD is observed for the 7P(3/2) and 8P(3/2) states. The CDAD signal is significantly larger for the 8P(3/2) State than for the 7P(3/2) state, indicating a greater retention of the optical alignment of the 8P(3/2) state within the time sampled by the ionizing laser pulse. The differences in the retention of alignment for the two states are attributed to effects of hyperfine depolarization, caused by coupling of the electronic angular momentum to the nuclear spin. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. UNIV BIELEFELD,FAK PHYS,D-33501 BIELEFELD,GERMANY. AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA. OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831. STATE ACAD AEROSP INSTRUMENTAT,ST PETERSBURG 190000,RUSSIA. RP Feigerle, CS (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. RI Chernysheva, Larissa/E-5916-2014 NR 31 TC 11 Z9 11 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1996 VL 53 IS 6 BP 4183 EP 4189 DI 10.1103/PhysRevA.53.4183 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500065 ER PT J AU Chou, TT Yang, CN Yu, LH AF Chou, TT Yang, CN Yu, LH TI Bose-Einstein condensation of atoms in a trap SO PHYSICAL REVIEW A LA English DT Article AB We point out that the local density approximation (LDA) of Oliva is an adaptation of the Thomas-Fermi method, and is a good approximation when epsilon=HBAR omega/kT much less than 1. For the case of scattering length a>0, the LDA leads to a quantitative result, Eq. (14'), easily checked by experiments. Critical remarks are made about the physics of the many-body problem in terms of the scattering length a. C1 SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP Chou, TT (reprint author), UNIV GEORGIA,DEPT PHYS,ATHENS,GA 30602, USA. NR 11 TC 77 Z9 89 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 JUN PY 1996 VL 53 IS 6 BP 4257 EP 4259 DI 10.1103/PhysRevA.53.4257 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500076 ER PT J AU Nilsen, J AF Nilsen, J TI Lasing on the 3d->3p neonlike x-ray laser transitions driven by a self-photo-pumping mechanism SO PHYSICAL REVIEW A LA English DT Article ID POPULATION-INVERSION; RESONANT PHOTOEXCITATION; LINE RADIATION; BEAM-FOIL; PLASMAS; CONFIGURATIONS; PINCH; GAIN; IONS; IX AB This paper presents an x-ray laser mechanism that uses radiation trapping of the strongest 3d P-1(1)-->2p( 1)S(0) neonlike resonance line in an optically thick plasma to create an intense radiation field that radiatively drives population from the neonlike ground state to the 3d P-1(1) state, which then lases to the 3p P-1(1) and 3p P-3(1) states. Collisional mixing of the 3p states with nearby 3s and 3d states depopulates the lower laser states. Modeling is presented for this mechanism in neonlike argon. Strong gain is predicted on the two 3d-->3p transitions at 451 and 465 Angstrom, the first of which has been observed in recent x-ray laser experiments using an argon gas puff. This pumping mechanism also enhances the population of the 3p S-1(0) state and the gain of the two 3p-->3s, J=0-->1 transitions, which are at 431 and 469 Angstrom in argon. RP Nilsen, J (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 34 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1996 VL 53 IS 6 BP 4539 EP 4546 DI 10.1103/PhysRevA.53.4539 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500108 ER PT J AU Milonni, PW Fearn, H Zeilinger, A AF Milonni, PW Fearn, H Zeilinger, A TI Theory of two-photon down-conversion in the presence of mirrors SO PHYSICAL REVIEW A LA English DT Article AB A theory of two-photon down-conversion in the presence of mirrors is developed and applied to recent observations of Herzog et nl. [Phys. Rev. Lett. 72, 629 (1994)]. The experimentally observed results for counting and coincidence rates as functions of mirror-crystal separations are obtained, and it is shown how the same results may be derived in a simplified formulation that presumes phase-matched signal and idler modes. We account for the observed effects of the finite coherence length of the pump field as well as the signal and idler coherence lengths, which are much shorter than the pump coherence length and have a different physical origin. Our analysis also supports the interpretation of the phenomena observed as being analogous to the modification of single photon spontaneous emission of atoms in cavity QED. C1 UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA. CALIF STATE UNIV FULLERTON, DEPT PHYS, FULLERTON, CA 92634 USA. RP Milonni, PW (reprint author), LOS ALAMOS NATL LAB, DIV THEORET T4, LOS ALAMOS, NM 87545 USA. NR 12 TC 17 Z9 17 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1996 VL 53 IS 6 BP 4556 EP 4566 DI 10.1103/PhysRevA.53.4556 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UR605 UT WOS:A1996UR60500110 ER PT J AU Tyson, TA deLeon, JM Conradson, SD Bishop, AR Neumeier, JJ Roder, H Zang, J AF Tyson, TA deLeon, JM Conradson, SD Bishop, AR Neumeier, JJ Roder, H Zang, J TI Evidence for a local lattice distortion in Ca-doped LaMnO3 SO PHYSICAL REVIEW B LA English DT Article AB We have found that a significant change in the local structure of La2/3Ca1/3MnO3 occurs between 80 K and temperatures above the Curie temperature, T-c=270 K. Near-edge x-ray-absorption spectra exhibits changes between 80 K and above T-c. X-ray-absorption fine structure reveals differences between the nearest-neighbor Mn-O bond distributions at 80 K and above T-c. The single-site distribution at low temperature becomes a complex, multi-site distribution above T-c. The observed change is consistent with proposed small polaron related local Jahn-Teller distortions for T>T-c. C1 INST POLITECN NACL MERIDA, CTR INVEST & ESTUDIOS AVANZADOS, MERIDA 97310, VENEZUELA. RP LOS ALAMOS NATL LAB, POB 1663, LOS ALAMOS, NM 87545 USA. NR 32 TC 121 Z9 122 U1 1 U2 17 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 JUN 1 PY 1996 VL 53 IS 21 BP 13985 EP 13988 DI 10.1103/PhysRevB.53.13985 PG 4 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600004 ER PT J AU Sato, N Aso, N Hirota, K Komatsubara, T Endoh, Y Shapiro, SM Lander, GH Kakurai, K AF Sato, N Aso, N Hirota, K Komatsubara, T Endoh, Y Shapiro, SM Lander, GH Kakurai, K TI Anisotropy and two length scales in the magnetic critical scattering in the heavy-fermion superconductor UPd2Al3 SO PHYSICAL REVIEW B LA English DT Article ID PHASE AB We have performed neutron critical scattering experiments on the heavy-fermion superconductor UPd2Al3 above the Neel temperature in order to characterize the short-ranged correlations associated with the magnetic ordering. The magnetic correlation length along the hexagonal c axis is longer than that in the basal plane, suggesting that the antiferromagnetic interaction along the c axis is stronger than the ferromagnetic one in the basal plane. This antiferromagnetic correlation is discussed in connection with the pairing mechanism of the superconductivity. We also find that the magnetic fluctuations exhibit the two-length scales reminiscent of features observed in Tb and Ho. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST TRANSURANIUM ELEMENTS,D-76125 KARLSRUHE,GERMANY. UNIV TOKYO,INST SOLID STATE PHYS,NEUTRON SCATTERING LAB,TOKAI,IBARAKI 31911,JAPAN. RP Sato, N (reprint author), TOHOKU UNIV,GRAD SCH SCI,DEPT PHYS,SENDAI,MIYAGI 98077,JAPAN. RI Hirota, Kazuma/C-6797-2008 NR 23 TC 10 Z9 10 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14043 EP 14046 DI 10.1103/PhysRevB.53.14043 PG 4 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600019 ER PT J AU Soderlind, P Moriarty, JA Wills, JM AF Soderlind, P Moriarty, JA Wills, JM TI First-principles theory of iron up to earth-core pressures: Structural, vibrational, and elastic properties SO PHYSICAL REVIEW B LA English DT Article ID GENERALIZED GRADIENT APPROXIMATION; CUBIC TRANSITION-METALS; GROUND-STATE PROPERTIES; INTERATOMIC POTENTIALS; DENSITY FUNCTIONALS; PHASE-DIAGRAM; TEMPERATURES; CONSTANTS; ELEMENTS; SYSTEMS AB Ab initio electronic-structure calculations, based on density-functional theory and a full-potential linear-muffin-tin-orbital method, have been used to predict crystal-structure phase stabilities, elastic constants, and Brillouin-zone-boundary phonons for iron under compression. Total energies for five crystal structures, bcc, fcc, bct, hcp, and dhcp, have been calculated over a wide volume range. In agreement with experiment and previous theoretical calculations, a magnetic bcc ground state is obtained at ambient pressure and a nonmagnetic hcp ground state is found at high pressure, with a predicted bcc --> hcp phase transition at about 10 GPa. Also in agreement with very recent diamond-anvil-cell experiments, a metastable dhcp phase is found at high pressure, which remains magnetic and consequently accessible at high temperature up to about 50 GPa. In addition, the bcc structure becomes mechanically unstable at pressures above 2 Mbar (200 GPa) and a metastable, but still magnetic, bct phase (c/a similar or equal to 0.875) develops. For high-pressure nonmagnetic iron, fee and hcp elastic constants and fee phonon frequencies have been calculated to above 4 Mbar. These quantities rise smoothly with pressure, but an increasing tendency towards elastic anisotropy as a function of compression is observed, and this has important implications for the solid inner-core of the earth. The fee elastic-constant and phonon data have also been used in combination with generalized pseudopotential theory to. develop many-body interatomic potentials, from which high-temperature thermodynamic properties and melting can be obtained. In this paper, these potentials have been used to calculate full fcc and hcp phonon spectra and corresponding Debye temperatures as a function of compression. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, POB 808, LIVERMORE, CA 94551 USA. NR 39 TC 219 Z9 221 U1 3 U2 40 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 JUN 1 PY 1996 VL 53 IS 21 BP 14063 EP 14072 DI 10.1103/PhysRevB.53.14063 PG 10 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600024 ER PT J AU Radlinski, AP Boreham, CJ Wignall, GD Lin, JS AF Radlinski, AP Boreham, CJ Wignall, GD Lin, JS TI Microstructural evolution of source rocks during hydrocarbon generation: A small-angle-scattering study SO PHYSICAL REVIEW B LA English DT Article ID PROTEROZOIC MCARTHUR BASIN; X-RAY-SCATTERING; NORTHERN AUSTRALIA; NEUTRON-SCATTERING; PETROLEUM GEOLOGY; FRACTAL GEOMETRY; ORGANIC-MATTER; GEOCHEMISTRY; MIGRATION; POLYMERS AB The evolution of microstructure of shaly source rocks occuring during the natural oil generation is studied by the small-angle neutron and x-ray scattering for length scales 50-2000 Angstrom. The study is performed on a set of rocks with several weight percent organic matter content, forming a natural maturity sequence for hydrocarbon generation. These rocks have been previously analyzed using various geochemical methods. The applicability of small-angle scattering techniques for the quantitative source rock studies is also tested using the laboratory-prepared rocks containing hydrogenated or deuterated eicosane. Although the natural source rocks are five-phase systems, they are perceived by neutrons as quasi-two-phase, which enables straightforward interpretation of the SANS data. The surfaces of immature source rocks are fractal (D=2.5+/-0.1) within the entire length scale region, regardless of the organic content. Upon maturation, two distinct fractal regimes develop (D=2.8 +/-0.1 and D=2.0+/-0.05) for the length scales below and above 600 Angstrom, respectively. The SAXS and SANS data are compared with the geochemical thermal maturity indicators and a model of source rock structural evolution is presented. Our data suggest an oil generation scenario according to which hydrocarbons are produced from macerals finely dispersed inside the bulk of the rock and also concentrated on the grain boundaries for grain sizes larger than 600 Angstrom. Upon reaching the thermal conditions necessary for oil generation the small grains crack and release oil into these microfractures, whereas the intergranular macerals produce oil and also wet the interface, thus forming an oil-wet network of conduits for primary migration. C1 OAK RIDGE NATL LAB,CTR SMALL ANGLE SCATTERING RES,DIV SOLID STATE,OAK RIDGE,TN 37831. RP Radlinski, AP (reprint author), AUSTRALIAN GEOL SURVEY ORG,GPO BOX 378,CANBERRA,ACT 2601,AUSTRALIA. OI Wignall, George/0000-0002-3876-3244 NR 34 TC 31 Z9 32 U1 0 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14152 EP 14160 DI 10.1103/PhysRevB.53.14152 PG 9 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600035 ER PT J AU Chang, YC James, RB AF Chang, YC James, RB TI Theoretical studies of carrier transport in HgI2 SO PHYSICAL REVIEW B LA English DT Article ID RED MERCURIC IODIDE; RAMAN-SCATTERING AB Theoretical studies of the electron-phonon coupling and carrier mobility for red mercuric iodide are presented. The electronic states are calculated by an empirical pseudopotential method, while the lattice vibrations are described via a rigid-ion model. Effects due to the deformation potential and polar-optical scattering are discussed. Carrier mobilities along both c and a axes as functions of temperature are calculated and they are in good agreement with the experimental data. C1 SANDIA NATL LABS,DEPT ADV MAT RES,LIVERMORE,CA 94550. RP Chang, YC (reprint author), UNIV ILLINOIS,DEPT PHYS,1110 W GREEN ST,URBANA,IL 61801, USA. RI Chang, Yia-Chung/F-4239-2011 NR 25 TC 1 Z9 1 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14200 EP 14211 DI 10.1103/PhysRevB.53.14200 PG 12 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600041 ER PT J AU Martin, MC Shirane, G Endoh, Y Hirota, K Moritomo, Y Tokura, Y AF Martin, MC Shirane, G Endoh, Y Hirota, K Moritomo, Y Tokura, Y TI Magnetism and structural distortion in the La0.7Sr0.3MnO3 metallic ferromagnet SO PHYSICAL REVIEW B LA English DT Article ID MAGNETORESISTANCE AB Neutron scattering studies on a single crystal of the highly correlated electron system, La1-xSrxMnO3 with x approximate to 0.3, have been carried out elucidating both the spin and lattice dynamics of this metallic ferromagnet. We report a large measured value of the spin wave stiffness constant, which directly shows that the electron transfer energy of the d band is large. The spin dynamics, including magnetic critical scattering, demonstrate that this material behaves similar to other typical metallic ferromagnets such as Fe or Ni. The crystal structure is rhombohedral, as previously reported, for all temperatures studied (below similar to 425 K). We have observed superlattice peaks which show that the primary rhombohedral lattice distortion arises from oxygen octahedra rotations resulting in an R (3) over bar c structure. The superlattice reflection intensities, which are very sensitive to structural changes, are independent of temperature demonstrating that there is no primary lattice distortion anomaly at the magnetic transition temperature T-C=378.1 K; however, there is a lattice contraction. C1 TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. JOINT RES CTR ATOM TECHNOL,TSUKUBA,IBARAKI 305,JAPAN. UNIV TOKYO,DEPT APPL PHYS,TOKYO 113,JAPAN. RP Martin, MC (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Hirota, Kazuma/C-6797-2008; Tokura, Yoshinori/C-7352-2009; OI moritomo, yutaka/0000-0001-6584-7489 NR 28 TC 259 Z9 259 U1 2 U2 25 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14285 EP 14290 DI 10.1103/PhysRevB.53.14285 PG 6 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600050 ER PT J AU Crespi, VH Lu, L Jia, YX Khazeni, K Zettl, A Cohen, ML AF Crespi, VH Lu, L Jia, YX Khazeni, K Zettl, A Cohen, ML TI Thermopower of single-crystal Nd-1-x(Sr,Pb)(x)MnO3-delta SO PHYSICAL REVIEW B LA English DT Article ID MAGNETORESISTANCE; TRANSITION AB We report measurements of the thermopower of the single-crystal manganite perovskite Nd-1-x(Sr,Pb)MnO3-delta from 4.2 to 350 K at zero and finite magnetic field. The sign and magnitude of the thermopower above the magnetic transition are doping dependent. The magnitude of the thermopower drops sharply below the transition to the magnetically ordered state. At lower temperatures the thermopower changes sign from negative to positive with decreasing temperature in the range 100-150 K. Implications for the temperature-dependent electronic structure and scattering processes in this temperature range are discussed. The high-temperature behavior is interpreted within a lattice polaron model. Further analysis suggests a form of variable-range hopping conduction at high temperatures. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. RP Crespi, VH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016; OI Zettl, Alex/0000-0001-6330-136X; Crespi, Vincent/0000-0003-3846-3193 NR 32 TC 33 Z9 33 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14303 EP 14308 DI 10.1103/PhysRevB.53.14303 PG 6 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600053 ER PT J AU Chauvet, O Emin, D Forro, L Aselage, TL Zuppiroli, L AF Chauvet, O Emin, D Forro, L Aselage, TL Zuppiroli, L TI Spin susceptibility of boron carbides: Dissociation of singlet small bipolarons SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; SMALL POLARONS; MODEL; CONDUCTION; CARBON; SOLIDS AB Using ESR, the spin susceptibilities of a crystal and ceramics of boron carbides have been measured between 4 and 1200 K. A thermally generated contribution to the spin susceptibility, which may be discerned emerging above 100 K, becomes unmistakable above 300 K. The g values of these spins differ from those of the temperature-independent background spins that dominate low-temperature ESR measurements. Thus, ESR measurements at temperatures well above those of previous works unearth thermally generated spins in boron carbides. We suggest that these thermally induced spins arise from thermal dissociation of boron carbides' singlet small bipolarons. The energy with which a small bipolaron is bound with respect to dissociating into two small polarons is estimated to be about 0.2 eV. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. ECOLE POLYTECH FED LAUSANNE,IGA,LAB PHYS SOLIDES SEMICRISTALLINS,CH-1015 LAUSANNE,SWITZERLAND. RI chauvet, olivier/K-4579-2016 OI chauvet, olivier/0000-0002-7801-3827 NR 43 TC 20 Z9 20 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14450 EP 14457 DI 10.1103/PhysRevB.53.14450 PG 8 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600068 ER PT J AU Blackburn, JA Smith, HJT GronbechJensen, N AF Blackburn, JA Smith, HJT GronbechJensen, N TI Chaos and thermal noise in a Josephson junction coupled to a resonant tank SO PHYSICAL REVIEW B LA English DT Article ID INDUCED ESCAPE; ATTRACTORS; BASIN AB Selected dynamical modes are investigated for the autonomous system formed from a dc biased Josephson junction which is resistively coupled to a resonant tank. A hysteretic zone in the current-voltage characteristic is shown to result from coexisting chaotic and periodic states. The detailed features of these states, including the geometrical structure of the attractors and their basins of attraction, as well as thermally induced transitions between them, are explored. C1 UNIV WATERLOO,DEPT PHYS,WATERLOO,ON N2L 3G1,CANADA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP Blackburn, JA (reprint author), WILFRID LAURIER UNIV,DEPT PHYS & COMP,WATERLOO,ON N2L 3C5,CANADA. NR 16 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14546 EP 14551 DI 10.1103/PhysRevB.53.14546 PG 6 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600079 ER PT J AU Bulaevskii, LN Dominguez, D Maley, MP Bishop, AR Ivlev, BI AF Bulaevskii, LN Dominguez, D Maley, MP Bishop, AR Ivlev, BI TI Collective mode and the c-axis critical current of a Josephson-coupled superconductor at high parallel magnetic fields SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; VORTICES AB Using Maxwell and time-dependent Ginzburg-Landau equations in the framework of a Lawrence-Doniach model we derive dynamical equations for the order parameter phase difference in Josephson-coupled layered superconductors. These equations allow the description of nonstationary Josephson effects in magnetic fields parallel to the layers. We obtain the dispersion relation and relaxation rate of collective modes in the absence of a magnetic field and in a strong parallel magnetic field. The dispersion with respect to the momentum in the ab plane in high fields is much stronger that in a single Josephson junction due to the multilayer structure. This leads to a very weak c-axis critical current in high magnetic fields. The relaxation rate of collective modes is found to be weak in comparison with its frequency. We discuss experimental data for the c-axis plasma resonance and critical current in parallel magnetic fields. C1 UNIV AUTONOMA SAN LUIS POTOSI,INST FIS,SAN LUIS POTOSI 78000,MEXICO. RP Bulaevskii, LN (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Dominguez, Daniel/E-9304-2016 OI Dominguez, Daniel/0000-0002-6204-0150 NR 34 TC 65 Z9 66 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14601 EP 14610 DI 10.1103/PhysRevB.53.14601 PG 10 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600086 ER PT J AU Chmaissem, O Jorgensen, JD Yamaura, K Hiroi, Z Takano, M Shimoyama, J Kishio, K AF Chmaissem, O Jorgensen, JD Yamaura, K Hiroi, Z Takano, M Shimoyama, J Kishio, K TI Crystal structures of Hg-Sr-Ca-Cu-O superconductors with enhanced flux pinning: Hg1-xRexSr2Can-1CunO2n+2+delta(n=2,3; x approximate to 0.2-0.25) SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; IRREVERSIBILITY LINE; HGBA2CUO4+DELTA AB The crystal structures of Hg1-xRexSrxCan-1CunO2n+2+delta (n=2,3; x approximate to 0.2-0.25) (synthesized at high pressure) were refined using neutron powder diffraction and the Rietveld analysis technique. Superconductivity was not observed in the as-prepared n=2 compound while a T-c of 107 K was measured for the n=3 sample. Postannealing in evacuated tubes results in creating superconductivity in the n=2 sample with a T-c of 90 K and in enhancing it up to 120 K in the n=3 sample. The structures of both as-prepared and vacuum-annealed samples were investigated. In both compounds, Re substitutes at the Hg site. Four additional oxygen atoms are incorporated into the (Hg, Re) plane for each Re atom providing an octahedral environment for Re. Thus, for a composition of x approximate to 0.25, all available oxygen sites in the (Hg, Re) plane are filled. These oxygen atoms shift off the ideal position to form bonds of appropriate length (1.88 Angstrom) with Re. Vacuum-annealed samples show oxygen deficiency in the (Hg, Re) layer suggesting that the actual Re content is below the solubility limit. The enhanced flux pinning for these chemically substituted compounds could result from the observed shortening of the blocking layer by 0.8-0.9 Angstrom and/or from increased interlayer coupling through the blocking layer by possible improvement in electrical conduction. Additionally, Hg-rich regions and/or planar defects (faults) separating domains where the Re-O-6 octahedra are ordered in different ways could act as pinning centers. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. KYOTO UNIV,INST CHEM RES,UJI,KYOTO 611,JAPAN. UNIV TOKYO,DEPT APPL CHEM,BUNKYO KU,TOKYO 113,JAPAN. RP Chmaissem, O (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 19 TC 76 Z9 76 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 21 BP 14647 EP 14655 DI 10.1103/PhysRevB.53.14647 PG 9 WC Physics, Condensed Matter SC Physics GA UQ726 UT WOS:A1996UQ72600091 ER PT J AU Martin, MC Shirane, G Fujii, C Nishi, M Fujita, O Akimitsu, J Hase, M Uchinokura, K AF Martin, MC Shirane, G Fujii, C Nishi, M Fujita, O Akimitsu, J Hase, M Uchinokura, K TI Temperature dependence of the spin-Peierls energy gap and anomalous line shapes in CuGeO3 SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION AB Neutron-scattering measurements on a large single crystal of CuGeO3 have been used to determine the temperature dependence of the spin-Peierls energy gap. While the power-law behavior of the intensity of structural superlattice peaks is well fit by I(T)proportional to(T-c - T)(2 beta) with an exponent of beta=0.33, the exponent for the temperature dependence of the energy gap is significantly smaller than expected for conventional spin-Peierls materials. Usual scaling relations relate the energy gap to the superlattice reflection intensity as Delta(T)proportional to I-a with a = 1/3; the present results suggest an exponent of a approximate to 1/6 for CuGeO3. An additional scattering cross section is observed in constant-q and constant-E scans creating a long tail extending to higher energies relating to a proposed scattering continuum. C1 UNIV TOKYO,INST SOLID STATE PHYS,NEUTRON SCATTERING LAB,TOKAI,IBARAKI 31911,JAPAN. AOYAMA GAKUIN UNIV,DEPT PHYS,SETAGAYA KU,TOKYO 157,JAPAN. INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN. UNIV TOKYO,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN. RP Martin, MC (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Hase, Masashi/B-8900-2008 OI Hase, Masashi/0000-0003-2717-461X NR 24 TC 28 Z9 28 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 22 BP 14713 EP 14716 PG 4 WC Physics, Condensed Matter SC Physics GA UR047 UT WOS:A1996UR04700005 ER PT J AU Campuzano, JC Ding, H Norman, MR Randeira, M Bellman, AF Mochiku, T Kadowaki, K AF Campuzano, JC Ding, H Norman, MR Randeira, M Bellman, AF Mochiku, T Kadowaki, K TI Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission SO PHYSICAL REVIEW B LA English DT Article ID RESOLUTION AB Particle-hole (p-h) mixing is a fundamental consequence of the existence of a pair condensate. We present direct experimental evidence for p-h mixing in the angle-resolved photoemission (ARPES) spectra in the superconducting state of Bi2Sr2CaCu2O8+delta. In addition to its pedagogical importance, this establishes unambiguously that the gap observed in ARPES is associated with superconductivity. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. TATA INST FUNDAMENTAL RES,BOMBAY 400005,MAHARASHTRA,INDIA. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN. RP Campuzano, JC (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Takahashi, Takashi/E-5080-2010; Campuzano, Juan Carlos/G-4358-2012; Norman, Michael/C-3644-2013 NR 11 TC 91 Z9 93 U1 1 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 22 BP 14737 EP 14740 PG 4 WC Physics, Condensed Matter SC Physics GA UR047 UT WOS:A1996UR04700011 ER PT J AU Deaven, DM Rokhsar, DS AF Deaven, DM Rokhsar, DS TI Variational evidence for spin liquids in frustrated lattices SO PHYSICAL REVIEW B LA English DT Article ID RESONATING-VALENCE-BOND; QUANTUM HEISENBERG ANTIFERROMAGNETS; T = 0; GROUND-STATE; KAGOME ANTIFERROMAGNET; TRIANGULAR-LATTICE; SQUARE-LATTICE; MONTE-CARLO; NEEL STATE; SOLITONS AB We present a Gutzwiller-projected variational state appropriate for Heisenberg quantum antiferromagnets which incorporates staggered magnetization as a continuous variational parameter. Although we obtain Neel-ordered ground states with appropriate sublattice magnetization on the square, honeycomb, and triangular lattice spin-1/2 quantum antiferromagnets, we find no such order on the kagome lattice, providing evidence that the ground state on the kagome lattice is disordered. The spin-spin correlations we obtain for spins separated by more than a lattice constant are similar to those obtained by exact diagonalization of small clusters. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP Deaven, DM (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES LAB,USDA,AMES,IA 50011, USA. NR 32 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 22 BP 14966 EP 14970 DI 10.1103/PhysRevB.53.14966 PG 5 WC Physics, Condensed Matter SC Physics GA UR047 UT WOS:A1996UR04700037 ER PT J AU Liu, SH Cooke, JF AF Liu, SH Cooke, JF TI Magnetic excitations in the sinusoidal spin phase of Er and Tm SO PHYSICAL REVIEW B LA English DT Article ID THULIUM METAL AB The frequency moment method is used to study the magnetic excitations in magnetically ordered systems, especially the sinusoidally modulated spin structure that occurs just below the Neel temperatures of erbium and thulium. It is shown that the transverse excitations may have rather sharp but dispersionless spectra or broad spectra depending on the relative strengths of the twofold anisotropy energy versus the exchange energy. The longitudinal spin excitations are extensions of the Goldstone modes. They may have rather sharp spectra with linear dispersion relations when the exchange and anisotropy energies are comparable. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830. RP Liu, SH (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 19 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 22 BP 14996 EP 15003 DI 10.1103/PhysRevB.53.14996 PG 8 WC Physics, Condensed Matter SC Physics GA UR047 UT WOS:A1996UR04700041 ER PT J AU Zheludev, A Nagler, SE Shapiro, SM Chou, LK Talham, DR Meisel, MW AF Zheludev, A Nagler, SE Shapiro, SM Chou, LK Talham, DR Meisel, MW TI Spin dynamics in the linear-chain S=1 antiferromagnet Ni(C3H10N2)(2)N-3(ClO4) SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM ENERGY-GAP; HEISENBERG-ANTIFERROMAGNET; HALDANE-GAP; MONTE-CARLO; NEUTRON-SCATTERING; FIELD-THEORY; SIGMA-MODEL; EXCITATIONS; ANISOTROPY AB Magnetic excitations is the quasi-one-dimensional Heisenberg spin-1 antiferromagnet Ni(C3H10N2)(2)N3ClO4) (NINAZ) have been studied by single-crystal inelastic neutron scattering. A Haldane gap Delta approximate to 3.6 meV in the spin excitation spectrum was observed in the vicinity of the antiferromagnetic wave vector at low temperature and the dispersion relation was measured. The temperature dependence of the energy gap Delta(T) was measured in the range 8-50 K and was found to be inconsistent with the predictions of the quantum nonlinear sigma model. The results are discussed comparison with those found in the literature for similar systems. C1 UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. UNIV FLORIDA,CTR ULTRALOW TEMP RES,GAINESVILLE,FL 32611. RP Zheludev, A (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010 OI Nagler, Stephen/0000-0002-7234-2339 NR 28 TC 37 Z9 37 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 22 BP 15004 EP 15009 DI 10.1103/PhysRevB.53.15004 PG 6 WC Physics, Condensed Matter SC Physics GA UR047 UT WOS:A1996UR04700042 ER PT J AU Xu, M Sok, J Ostenson, JE Finnemore, DK Dabrowski, B AF Xu, M Sok, J Ostenson, JE Finnemore, DK Dabrowski, B TI Reversible magnetization and anisotropy in YBa2Cu4O8 SO PHYSICAL REVIEW B LA English DT Article ID II SUPERCONDUCTORS; MODEL AB The reversible magnetization for H parallel to ab has been studied for grain-aligned YBa2Cu4O8 in order to determine whether the Hao-Clem theory can properly describe the vortex state in this orientation, as well as the orientation for H parallel to c. Between temperatures of 70 and 76 K, the magnetization is reversible to better than 2% and the results scale very well to the universal Hao-Clem curve even though the supercurrents have a highly noncircular path as they circulate around a vortex parallel to the ab plane. The thermodynamic critical field is the same for H parallel to ab as for H parallel to c, as expected, and the Ginzburg-Landau parameter kappa(ab) = 380 compared to kappa(c) = 70 is consistent with an anisotropy value gamma = 5.8 +/- 0.4. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. SAMSUNG ADV INST TECHNOL,MAT & DEVICE RES CTR,NEW MAT LAB,SUWON 440600,SOUTH KOREA. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50511. USDA,AMES LAB,AMES,IA 50511. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP Xu, M (reprint author), USDA,AMES LAB,AMES,IA 50011, USA. NR 8 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1996 VL 53 IS 22 BP 15313 EP 15315 DI 10.1103/PhysRevB.53.15313 PG 3 WC Physics, Condensed Matter SC Physics GA UR047 UT WOS:A1996UR04700076 ER PT J AU Cohen, TD Friar, JL Miller, GA van Kolck, U AF Cohen, TD Friar, JL Miller, GA van Kolck, U TI pp->pp pi(0) reaction near threshold: A chiral power counting approach SO PHYSICAL REVIEW C LA English DT Article ID TOTAL CROSS-SECTION; PERTURBATION-THEORY; NUCLEAR-FORCES; P+P->P+P+PI-0; LAGRANGIANS AB We use power-counting arguments as an organizing principle to apply chiral perturbation theory, including an explicit Delta, to the pp-->pp pi(0) reaction near threshold. There are two lowest-order leading mechanisms expected to contribute to the amplitude with similar magnitudes: an impulse term, and a Delta-excitation mechanism. We examine formally subleading but potentially large mechanisms, including pion-rescattering and short-ranged contributions. We show that the pion-rescattering contribution is enhanced by off-shell effects and has a sign opposite to that of a recent estimate based on a PCAC pion interpolating field. Our result is that the impulse term interferes destructively with the pion-rescattering and Delta-excitation terms. In addition, we have modeled the short-ranged interaction using sigma and omega exchange mechanisms. A recoil correction to the impulse approximation is small. The total amplitude obtained including all of these processes is found to yield cross sections substantially smaller than the measured ones. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA. RP UNIV MARYLAND, DEPT PHYS, COLLEGE PK, MD 20742 USA. NR 43 TC 139 Z9 139 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1996 VL 53 IS 6 BP 2661 EP 2673 DI 10.1103/PhysRevC.53.2661 PG 13 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500014 ER PT J AU Grimes, SM Bauer, RW Anderson, JD Brown, VR Pohl, BA Poppe, CH Madsen, VA Langkau, R Scobel, W Stamer, S AF Grimes, SM Bauer, RW Anderson, JD Brown, VR Pohl, BA Poppe, CH Madsen, VA Langkau, R Scobel, W Stamer, S TI Low-lying Gamow-Teller states in Nb-92 SO PHYSICAL REVIEW C LA English DT Article ID P,N REACTION; B-11(P,N)C-11 REACTION; INTERMEDIATE ENERGIES; CHARGE-EXCHANGE; STRENGTH; ZR-90; SPIN AB Cross sections for the (p,n) reaction on targets of Zr-90 and Zr-92 have been measured at 26 MeV. Our resolution for these measurements was better than 200 keV and allowed the observation of numerous 1(+) states in Nb-92 below 7 MeV excitation. Our analysis is focused on states below the primary Gamow-Teller state and shows a fragmentation of the Gamow-Teller strength that is only partially accounted for by three different model calculations: a quasiparticle model, a shell model, and a random-phase approximation calculation. All three models yield predictions which include appreciable strength between 3 and 7 MeV excitation, but fail to describe our experimental results in detail. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OREGON STATE UNIV,CORVALLIS,OR 97331. UNIV HAMBURG,INST EXPT PHYS 1,HAMBURG,GERMANY. RP Grimes, SM (reprint author), OHIO UNIV,ATHENS,OH 45701, USA. NR 34 TC 6 Z9 6 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 JUN PY 1996 VL 53 IS 6 BP 2709 EP 2717 DI 10.1103/PhysRevC.53.2709 PG 9 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500018 ER PT J AU Raman, S McGrory, JB Jurney, ET Starner, JW AF Raman, S McGrory, JB Jurney, ET Starner, JW TI Gamma-ray transitions in Pb-206 studied in the Pb-205(n,gamma) reaction SO PHYSICAL REVIEW C LA English DT Article ID SHELL-MODEL CALCULATIONS; ISOTOPES; CAPTURE; ENERGY; PB AB A study of the gamma-ray spectrum following thermal-neutron capture by Pb-205 has revealed 54 gamma rays, which have been incorporated into a level scheme consisting of 22 excited states in Pb-206. This study was carried out with an similar to 9 mg lead sample enriched to 78.9% in radioactive Pb-205. The neutron binding energy of Pb-206 was determined to be 8086.67 +/- 0.06 keV, and the thermal-neutron-capture cross section for Pb-206 to be 4.5 +/- 0.2 b. The low-lying portion of the level scheme of Pb-206 and the gamma-ray branchings of positive-parity states have been compared with shell-model predictions. The overall agreement is excellent for the former and reasonably good for the latter. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Raman, S (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 26 TC 5 Z9 5 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 JUN PY 1996 VL 53 IS 6 BP 2732 EP 2738 DI 10.1103/PhysRevC.53.2732 PG 7 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500020 ER PT J AU Reinhard, PG Nazarewicz, W Bender, M Maruhn, JA AF Reinhard, PG Nazarewicz, W Bender, M Maruhn, JA TI Lipkin-Nogami pairing scheme in self-consistent nuclear structure calculations SO PHYSICAL REVIEW C LA English DT Article ID HEAVIEST ELEMENTS; 2-LEVEL MODEL; STATES; DISTRIBUTIONS; DYNAMICS; ISOTOPES; SHAPES AB We investigate the pairing treatment with approximate particle number projection, known as the Lipkin-Nogami scheme, in connection with nuclear Hartree-Fock models. A prescription for the pairing strength is developed. It is based on the average gap method and employs a Thomas-Fermi model to estimate the average level density at the Fermi surface. The second-order variation of the Skyrme energy functional gives feedback to the self-consistent density and thus to the mean field. This effect turns out to be small but non-negligible. The Lipkin-Nogami scheme is compared with the conventional treatment of pairing based on the BCS approximation. The bulk observables, especially those which are related to surface properties, depend on the pairing scheme employed, with the differences most noticeable for light nuclei. Pronounced effects on deformation energy surfaces were found, leading to sizable differences in the deformation energies. C1 UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. UNIV ERLANGEN NURNBERG,INST THEORET PHYS,D-91058 ERLANGEN,GERMANY. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. WARSAW UNIV,INST THEORET PHYS,PL-00681 WARSAW,POLAND. UNIV FRANKFURT,INST THEORET PHYS,D-60054 FRANKFURT,GERMANY. RP Reinhard, PG (reprint author), JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831, USA. RI Bender, Michael/B-9004-2009 NR 53 TC 31 Z9 31 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 JUN PY 1996 VL 53 IS 6 BP 2776 EP 2785 DI 10.1103/PhysRevC.53.2776 PG 10 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500025 ER PT J AU Dobaczewski, J Nazarewicz, W Werner, TR Berger, JF Chinn, CR Decharge, J AF Dobaczewski, J Nazarewicz, W Werner, TR Berger, JF Chinn, CR Decharge, J TI Mean-field description of ground-state properties of drip-line nuclei: Pairing and continuum effects SO PHYSICAL REVIEW C LA English DT Review ID HARTREE-FOCK; CHARGE RADII; NEUTRON-DRIP; COORDINATE REPRESENTATION; SUPERFLUID NUCLEI; EXOTIC NUCLEI; R-PROCESS; DENSITY; DEPENDENCE; FLUCTUATIONS AB Ground-state properties of exotic even-even nuclei with extreme neutron-to-proton ratios are described in the framework of self-consistent mean-field theory with pairing formulated in coordinate space. This theory properly accounts for the influence of the particle continuum, which is particularly important for weakly bound systems. The pairing properties of nuclei far from stability are studied with several interactions emphasizing different aspects, such as the range and density dependence of the effective interaction. Measurable consequences of spatially extended pairing fields are presented, and the sensitivity of the theoretical predictions to model details is discussed. C1 UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. CTR ETUD BRUYERES LE CHATEL,F-91680 BRUYERES CHATEL,FRANCE. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. RP Dobaczewski, J (reprint author), UNIV WARSAW,INST THEORET PHYS,HOZA 69,PL-00681 WARSAW,POLAND. NR 109 TC 458 Z9 470 U1 1 U2 7 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 JUN PY 1996 VL 53 IS 6 BP 2809 EP 2840 DI 10.1103/PhysRevC.53.2809 PG 32 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500029 ER PT J AU Egido, JL Martin, V Robledo, LM Sun, Y AF Egido, JL Martin, V Robledo, LM Sun, Y TI E3 transition probabilities in the platinum, mercury, and lead isotopes SO PHYSICAL REVIEW C LA English DT Article ID OCTUPOLE DEFORMATION; REALISTIC FORCES; LIGHT ACTINIDES; HG ISOTOPES; NUCLEI; REGION; STATES; EVEN; MASS; SYMMETRY AB Spectroscopical properties of the platinum, mercury, and lead isotopes are studied within the Hartree-Fock plus BCS framework with the finite range density-dependent Gogny force. These properties are also studied beyond mean-field theory by combining the use of generator-coordinate-method-like wave functions with the angular momentum projection technique as to generate many-body correlated wave functions that are at the same time eigenstates of the angular momentum operator. We apply this formalism to the calculation of reduced transition probabilities B(E3) from the lowest-lying octupole collective state to the ground state of several isotopes of the platinum, mercury, and lead nuclei whose experimental B(E3) values present a peculiar behavior. The projected calculations show a large improvement over the unprojected ones when compared with the experimental data. The unprojected calculations are unable to predict any structure in the B(E3). C1 UNIV POLITECN MADRID,FAC INFORMAT,E-28660 MADRID,SPAIN. DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. RP Egido, JL (reprint author), UNIV AUTONOMA MADRID,DEPT FIS TEOR C XI,E-28049 MADRID,SPAIN. RI Robledo, Luis Miguel/L-2557-2013; Sun, Yang/P-2417-2015; Egido, J. Luis/F-4921-2017 OI Robledo, Luis Miguel/0000-0002-6061-1319; Egido, J. Luis/0000-0002-8292-6127 NR 36 TC 9 Z9 9 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 JUN PY 1996 VL 53 IS 6 BP 2855 EP 2861 DI 10.1103/PhysRevC.53.2855 PG 7 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500032 ER PT J AU Lane, MR Gregorich, KE Lee, DM Mohar, MF Hsu, M Kacher, CD Kadkhodayan, B Neu, MP Stoyer, NJ Sylwester, ER Yang, JC Hoffman, DC AF Lane, MR Gregorich, KE Lee, DM Mohar, MF Hsu, M Kacher, CD Kadkhodayan, B Neu, MP Stoyer, NJ Sylwester, ER Yang, JC Hoffman, DC TI Spontaneous fission properties of (262)(104)Rf SO PHYSICAL REVIEW C LA English DT Article ID HEAVIEST ELEMENTS AB We have measured the mass and kinetic-energy distributions of fragments from the spontaneous fission (SF) of (262)(104)Rf. The (262)(104)Rf was produced via the Pu-244(Ne-22,4n) reaction with a production cross section of similar to 0.7 nb using 114.4-MeV projectiles. The kinetic energies and times of the coincident fission fragments were measured using our rotating wheel system. From these data the half-life, mass, and kinetic-energy distributions were derived. The total kinetic-energy (TKE) distribution appears to consist of a single component with a most probable pre-neutron-emission TKE of 215+/-2 MeV. The mass distribution is symmetric with a full width at half maximum of about 22 mass numbers. These results are consistent with trends observed for other trans-berkelium spontaneously fissioning isotopes. We determined the half-life to be 2.1+/-0.2 s by measuring its spontaneous fission decay. We also attempted to observe the alpha decay of (262)(104)Rf by searching for alpha decay correlated in time with SF from the alpha daughter, 1.2-ms No-258. We observed no such decays and have set an upper limit of 0.8% (68% confidence level) on the alpha decay branch of (262)(104)Rf. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP Lane, MR (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,MS 70A-3307,BERKELEY,CA 94720, USA. NR 38 TC 44 Z9 44 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 JUN PY 1996 VL 53 IS 6 BP 2893 EP 2899 DI 10.1103/PhysRevC.53.2893 PG 7 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500037 ER PT J AU Libby, B Mignerey, AC Colonna, N RousselChomaz, P Wozniak, GJ Moretto, LG AF Libby, B Mignerey, AC Colonna, N RousselChomaz, P Wozniak, GJ Moretto, LG TI Study of the decay of hot nuclei formed in La-139-induced reactions at E/A=45MeV by a hybrid dynamical-statistical calculation SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; COMPLEX FRAGMENT PRODUCTION; INTERMEDIATE-ENERGY; MULTIFRAGMENT PRODUCTION; MASS FRAGMENTS; TIME-SCALE; EMISSION; MEV/U; EQUILIBRIUM; SATURATION AB The reactions La-139 + Al-27 and La-139 + Cu-65 at E/A = 45 MeV have been modeled by combining a Boltzmann-Nordheim-Vlasov dynamical model calculation with a statistical sequential binary decay model code. For the reaction La-139 + Al-27, the major features of the experimental data are adequately described by the model calculations. These features include the inclusive fragment cross sections and the total charge and source velocity distributions of multiple fragment events. Other finer features, such as charge-Dalitz plots and the branching ratios between events of different multiplicity, are not reproduced by the calculation. The failure of the calculations is even greater for the reaction La-139 + Cu-65, in which only the source velocity distributions of multiple fragment events are reproduced. Because the source velocity can be a measure of how much of the target is incorporated into the projectile in inverse kinematics reactions, this suggests that the earliest stages of the reaction, described by the dynamical calculation, are adequately characterized by the model. It is the later stages of the reaction, when fragments are emitted, where the model calculation appears to fail. However, there are some indications that statistical decay in the reaction La-139 + Cu-65 has occurred, whether by sequential binary decays or some type of prompt multifragmentation. C1 UNIV MARYLAND,DEPT CHEM,COLLEGE PK,MD 20742. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RI Mignerey, Alice/D-6623-2011 NR 54 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1996 VL 53 IS 6 BP 2993 EP 3001 DI 10.1103/PhysRevC.53.2993 PG 9 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500047 ER PT J AU Xu, XM Kharzeev, D Satz, H Wang, XN AF Xu, XM Kharzeev, D Satz, H Wang, XN TI J/psi suppression in an equilibrating parton plasma SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; QUARK-GLUON PLASMA; THERMALIZATION TIME; MODEL; TEMPERATURE; TRANSITION; PHOTON; CHARM; QCD AB Short-distance QCD is employed to calculate the J/psi survival probability in an equilibrating parton gas whose evolution is governed by a set of master rate equations. Partons in the early stage of high-energy nuclear collisions may initially not be in equilibrium, but their average transverse momentum is sufficiently high to break up a Q (Q) over bar bound state. Such a breakup during the evolution of the parton gas is shown to cause a substantial J/psi suppression at both RHIC and LHC energies, using realistic estimates of the initial parton densities. The transverse momentum dependence of the suppression is also shown to be sensitive to the initial conditions and the evolution history of the parton plasma. C1 ACAD SINICA,SHANGHAI INST NUCL RES,DIV THEORY,SHANGHAI 201800,PEOPLES R CHINA. CERN,DIV THEORY,CH-1211 GENEVA,SWITZERLAND. UNIV BIELEFELD,FAK PHYS,D-33501 BIELEFELD,GERMANY. RP Xu, XM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,MAILSTOP 70A-3307,BERKELEY,CA 94720, USA. NR 51 TC 82 Z9 83 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 JUN PY 1996 VL 53 IS 6 BP 3051 EP 3056 DI 10.1103/PhysRevC.53.3051 PG 6 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500054 ER PT J AU Friar, JL Madland, DG Lynn, BW AF Friar, JL Madland, DG Lynn, BW TI QCD scales in finite nuclei SO PHYSICAL REVIEW C LA English DT Article ID QUANTUM FIELD-THEORY; CHIRAL LAGRANGIANS; FORCES; CURRENTS; DYNAMICS; MODEL AB The role of QCD scales and chiral symmetry in finite nuclei is examined. The Dirac-Hartree mean-field coupling constants of Nikolaus, Hoch, and Madland (NHM) are scaled in accordance with the QCD-based prescription of Manohar and Georgi. Whereas the 9 empirically based coupling constants of NHM span 13 orders of magnitude, the scaled coupling constants are almost all natural, being dimensionless numbers of order 1. We argue that this result provides good evidence that QCD and chiral symmetry apply to finite nuclei. C1 UNIV OXFORD,CLARENDON LABS,OXFORD OX1 3PU,ENGLAND. RP Friar, JL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 24 TC 61 Z9 62 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 JUN PY 1996 VL 53 IS 6 BP 3085 EP 3087 DI 10.1103/PhysRevC.53.3085 PG 3 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500057 ER PT J AU Aufderheide, MB Bloom, SD Mathews, GJ Resler, DA AF Aufderheide, MB Bloom, SD Mathews, GJ Resler, DA TI Importance of (n,p) reactions for stellar beta decay rates SO PHYSICAL REVIEW C LA English DT Article ID WEAK-INTERACTION RATES; INTERMEDIATE-MASS NUCLEI; SHELL-MODEL CALCULATIONS; GAMOW-TELLER STRENGTH; CAPTURE RATES; FE-54 AB Recent (n,p) experiments on Fe-54, Fe-56, Ni-58 and Co-59 have measured Gamow-Teller resonances which are crucial for determining stellar beta decay rates in Mn-54, Mn-56, Co-58, and Fe-59, respectively. These nuclei are important players in the iron-core URCA process, which is a dynamic balancing of electron capture and beta decay rates during the final stage of nuclear burning in massive stars. We find that three of the nuclei, after calibration from (n,p) measurements, have significantly stronger decay rates than currently expected. These stronger rates will cause a more vigorous URCA process, resulting in presupernova cores which are cooler and less neutron rich than is presently used in core collapse calculations. C1 LAWRENCE LIVERMORE NATL LAB, PHYS & SPACE TECHNOL DIRECTORATE, LIVERMORE, CA 94551 USA. UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. RP LAWRENCE LIVERMORE NATL LAB, DIV B, DEF & NUCL TECHNOL DIRECTORATE, POB 808, LIVERMORE, CA 94551 USA. NR 36 TC 27 Z9 27 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1996 VL 53 IS 6 BP 3139 EP 3142 DI 10.1103/PhysRevC.53.3139 PG 4 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500062 ER PT J AU Rubehn, T Bassini, R BegemannBlaich, M Blaich, T Ferrero, A Gross, C Imme, G Iori, I Kunde, GJ Kunze, WD Lindenstruth, V Lynen, U Mohlenkamp, T Moretto, LG Muller, WFJ Ocker, B Pochodzalla, J Raciti, G Reito, S Sann, H Schuttauf, A Seidel, W Serfling, V Trautmann, W Trzcinski, A Verde, G Worner, A Zude, E Zwieglinski, B AF Rubehn, T Bassini, R BegemannBlaich, M Blaich, T Ferrero, A Gross, C Imme, G Iori, I Kunde, GJ Kunze, WD Lindenstruth, V Lynen, U Mohlenkamp, T Moretto, LG Muller, WFJ Ocker, B Pochodzalla, J Raciti, G Reito, S Sann, H Schuttauf, A Seidel, W Serfling, V Trautmann, W Trzcinski, A Verde, G Worner, A Zude, E Zwieglinski, B TI Total and nuclear fission cross sections of U-238 at relativistic energies SO PHYSICAL REVIEW C LA English DT Article ID DIFFUSION PROCESS; COLLISIONS; PROJECTILES; FRICTION AB Total fission cross sections of U-238 projectiles were measured at bombarding energies of 0.6 and 1 GeV per nucleon for seven different targets (Be, C, Al, Cu, In, Au, and U). It is found that all data points fall onto one curve, independent of bombarding energy, once the electromagnetic contribution to the total fission cross sections is subtracted. The abrasion-ablation model predicts a significantly weaker target dependence than observed, and underestimates the nuclear fission cross sections for the heavier targets. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV MAINZ,INST KERNCHEM,D-55099 MAINZ,GERMANY. UNIV CATANIA,DIPARTIMENTO FIS,I-95129 CATANIA,ITALY. IST NAZL FIS NUCL,I-95129 CATANIA,ITALY. ROSSENDORF INC,FORSCHUNGSZENTRUM ROSSENDORF EV,D-01314 DRESDEN,GERMANY. UNIV FRANKFURT,INST KERNPHYS,D-60486 FRANKFURT,GERMANY. SOLTAN INST NUCL STUDIES,PL-00681 WARSAW,POLAND. RP Rubehn, T (reprint author), GSI DARMSTADT,D-64220 DARMSTADT,GERMANY. RI Verde, Giuseppe/J-3609-2012 NR 27 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1996 VL 53 IS 6 BP 3143 EP 3146 DI 10.1103/PhysRevC.53.3143 PG 4 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500063 ER PT J AU Bindra, KS Hua, PF Babu, BRS Baktash, C Barreto, J Cullen, DM Davids, CN Deng, JK Garrett, JD Halbert, ML Hamilton, JH Johnson, NR Kirov, A Kormicki, J Lee, IY Ma, WC McGowan, FK Ramayya, AV Sarantites, DG Soramel, F Winchell, D AF Bindra, KS Hua, PF Babu, BRS Baktash, C Barreto, J Cullen, DM Davids, CN Deng, JK Garrett, JD Halbert, ML Hamilton, JH Johnson, NR Kirov, A Kormicki, J Lee, IY Ma, WC McGowan, FK Ramayya, AV Sarantites, DG Soramel, F Winchell, D TI Prolate-oblate band mixing and new bands in Hg-182 - Reply SO PHYSICAL REVIEW C LA English DT Letter AB We reply to the preceding Comment. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. WASHINGTON UNIV,DEPT CHEM,ST LOUIS,MO 63130. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNISOR,OAK RIDGE,TN 37831. RP Bindra, KS (reprint author), VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235, USA. NR 5 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1996 VL 53 IS 6 BP 3165 EP 3165 DI 10.1103/PhysRevC.53.3165 PG 1 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500070 ER PT J AU Petrache, CM Sun, Y Bazzacco, D Lunardi, S Alvarez, CR Venturelli, R DeAcuna, D Maron, G Rao, MN Podolyak, Z Oliveira, JRB AF Petrache, CM Sun, Y Bazzacco, D Lunardi, S Alvarez, CR Venturelli, R DeAcuna, D Maron, G Rao, MN Podolyak, Z Oliveira, JRB TI Multiple dipole bands at prolate shapes in Nd-136 and their description through the projected shell model SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN STATES; ROTATIONAL BANDS; OBLATE ROTATION; NUCLEI; ODD AB Five bands dominated by strong M1 transitions have been observed in the Nd-136 nucleus. Two of them consist of only dipole transitions, whereas the other three show also weak crossover transitions. The bands have been firmly connected to lower-spin states. Theoretical calculations using the projected shell model suggest quasiparticle configurations involving two protons and two neutrons for the four lowest-lying bands. C1 IST NAZL FIS NUCL,SEZ PADOVA,I-35151 PADUA,ITALY. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. IST NAZL FIS NUCL,LAB NAZL LEGNARO,I-35020 LEGNANO,ITALY. UNIV SAO PAULO,INST FIS,BR-05389970 SAO PAULO,BRAZIL. RP Petrache, CM (reprint author), DIPARTIMENTO FIS,I-35151 PADUA,ITALY. RI Oliveira, Jose Roberto/J-3124-2012; Petrache, Costel/E-9867-2012; Sun, Yang/P-2417-2015 OI Oliveira, Jose Roberto/0000-0003-1362-7382; Petrache, Costel/0000-0001-8419-1390; NR 20 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 JUN PY 1996 VL 53 IS 6 BP R2581 EP R2585 PG 5 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500003 ER PT J AU Szymanski, JJ Snow, WM Bowman, JD Cain, B Crawford, BE Delheij, PPJ Hartman, RD Haseyama, T Keith, CD Knudson, JN Komives, A Leuschner, M Lowie, LY Masaike, A Matsuda, Y Mitchell, GE Penttila, SI Postma, H Rich, D Roberson, NR Seestrom, SJ Sharapov, EI Stephenson, SL Yen, YF Yuan, VW AF Szymanski, JJ Snow, WM Bowman, JD Cain, B Crawford, BE Delheij, PPJ Hartman, RD Haseyama, T Keith, CD Knudson, JN Komives, A Leuschner, M Lowie, LY Masaike, A Matsuda, Y Mitchell, GE Penttila, SI Postma, H Rich, D Roberson, NR Seestrom, SJ Sharapov, EI Stephenson, SL Yen, YF Yuan, VW TI Observation of a large parity nonconserving analyzing power in Xe SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON RESONANCES; VIOLATION; POLARIZATION; SCATTERING; TH-232; U-238; TESTS AB A large parity nonconserving longitudinal analyzing power was discovered in polarized-neutron transmission through Xe. An analyzing power of 4.3+/-0.2% was observed in a p-wave resonance at E(n)=3.2 eV. The measurement was performed with a liquid Xe target of natural isotopic abundance that was placed in the polarized epithermal neutron beam, flight path 2, at the Manuel Lujan Neutron Science Center. This apparatus was constructed by the TRIPLE Collaboration, and has been used for studies of parity symmetry in compound nuclear resonances. Part of the motivation of the experiment was to discover a nucleus appropriate for a sensitive test of time-reversal invariance in polarized-neutron transmission. The large analyzing power of the observed resonance may make it possible to design a test of time reversal invariance using a polarized-Xe target. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. DUKE UNIV,DURHAM,NC 27706. TRIANGLE UNIV NUCL LAB,DURHAM,NC 27708. TRIUMF,VANCOUVER,BC V6T 2A3,CANADA. KYOTO UNIV,FAC SCI,DEPT PHYS,KYOTO 60601,JAPAN. N CAROLINA STATE UNIV,RALEIGH,NC 27695. UNIV TECHNOL,2600 GA DELFT,NETHERLANDS. JOINT INST NUCL RES,DUBNA 141980,RUSSIA. RP Szymanski, JJ (reprint author), INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405, USA. RI Matsuda, Yasuyuki/C-3007-2008 OI Matsuda, Yasuyuki/0000-0002-9847-3791 NR 29 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1996 VL 53 IS 6 BP R2576 EP R2580 PG 5 WC Physics, Nuclear SC Physics GA UR045 UT WOS:A1996UR04500002 ER PT J AU Abachi, S Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alitti, J Alvarez, G Alves, GA Amidi, E Amos, N Anderson, EW Aronson, SH Astur, R Avery, RE Baden, A Balamurali, V Balderston, J Baldin, B Bantly, J Bartlett, JF Bazizi, K Bendich, J Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Bischoff, A Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Borders, J Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D CastillaValdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Chevalier, L Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C CullenVidal, D Cummings, MAC Cutts, D Dahl, OI De, K Demarteau, M Demina, R Denisenko, K Denisenko, N Denisov, D Denisov, SP Dharmaratna, W Diehl, HT Diesburg, M DiLoreto, G Dixon, R Draper, P Drinkard, J Ducros, Y Dugad, SR DurstonJohnson, S Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahey, S Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Franzini, P Fuess, S Gallas, E Galyaev, AN Gao, SG Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glebov, V Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Goncharov, PI Solis, JLG Gordon, H Goss, LT Graf, N Grannis, PD Green, DR Green, J Greenlee, H Griffin, G Grossman, N Grudberg, P Grunendahl, S Gu, WX Guglielmo, G Guida, JA Guida, JM Guryn, W Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hansen, S Hatcher, R Hauptman, JM Hedin, D Heinson, AP Heintz, U HernandezMontoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Hu, T Huehn, T Igarashi, S Ito, AS James, E Jaques, J Jerger, SA Jiang, JZY JoffeMinor, T Johari, H Johns, K Johnson, M Johnstad, H Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Kehoe, R Kelly, ML Kernan, A Kerth, L Kim, CL Kim, SK Klatchko, A Klima, B Klochkov, BI Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kourlas, J Kozelov, AV Kozlovski, EA Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Landsberg, G Lebrat, JF Leflat, A Li, H Li, J Li, YK LiDemarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Mandrichenko, IV Mangeot, P Mani, S Mansoulie, B Mao, HS Margulies, S Markeloff, R Markosky, L Marshall, T Martin, MI Marx, M May, B Mayorov, AA McCarthy, R McKibben, T McKinley, J McMahon, T Melanson, HL Neto, JRTD Merritt, KW Miettinen, H Milder, A Mincer, A deMiranda, JM Mishra, CS MohammadiBaarmand, M Mokhov, N Mondal, NK Montgomery, HE Mooney, P Mudan, M Murphy, C Murphy, CT Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Neis, E Nemethy, P Nesic, D Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, CH Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peryshkin, A Peters, M Piekarz, H Pischalnikov, Y Pluquet, A Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Puseljic, D Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rao, MVS Rapidis, PA Rasmussen, L Read, AL Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rusin, S Rutherfoord, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shao, YY Shivpuri, RK Shupe, M Singh, JB Sirotenko, V Smart, W Smith, A Smith, RP Snihur, R Snow, GR Snyder, S Solomon, J Sood, PM Sosebee, M Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stoianova, DA Stoker, D Streets, K Strovink, M Sznajder, A Taketani, A Tamburello, P Tarazi, J Tartaglia, M Taylor, TL Teiger, J Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Virador, PRG Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Wang, J Warchol, J Wayne, M Weerts, H Wen, F Wenzel, WA White, A White, JT Wightman, JA Wilcox, J Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yoshikawa, C Youssef, S Yu, J Yu, Y Zhang, DH Zhang, Y Zhu, Q Zhu, ZH Zieminska, D Zieminski, A Zylberstejn, A AF Abachi, S Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alitti, J Alvarez, G Alves, GA Amidi, E Amos, N Anderson, EW Aronson, SH Astur, R Avery, RE Baden, A Balamurali, V Balderston, J Baldin, B Bantly, J Bartlett, JF Bazizi, K Bendich, J Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Bischoff, A Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Borders, J Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D CastillaValdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Chevalier, L Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C CullenVidal, D Cummings, MAC Cutts, D Dahl, OI De, K Demarteau, M Demina, R Denisenko, K Denisenko, N Denisov, D Denisov, SP Dharmaratna, W Diehl, HT Diesburg, M DiLoreto, G Dixon, R Draper, P Drinkard, J Ducros, Y Dugad, SR DurstonJohnson, S Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahey, S Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Franzini, P Fuess, S Gallas, E Galyaev, AN Gao, SG Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glebov, V Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Goncharov, PI Solis, JLG Gordon, H Goss, LT Graf, N Grannis, PD Green, DR Green, J Greenlee, H Griffin, G Grossman, N Grudberg, P Grunendahl, S Gu, WX Guglielmo, G Guida, JA Guida, JM Guryn, W Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hansen, S Hatcher, R Hauptman, JM Hedin, D Heinson, AP Heintz, U HernandezMontoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Hu, T Huehn, T Igarashi, S Ito, AS James, E Jaques, J Jerger, SA Jiang, JZY JoffeMinor, T Johari, H Johns, K Johnson, M Johnstad, H Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Kehoe, R Kelly, ML Kernan, A Kerth, L Kim, CL Kim, SK Klatchko, A Klima, B Klochkov, BI Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kourlas, J Kozelov, AV Kozlovski, EA Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Landsberg, G Lebrat, JF Leflat, A Li, H Li, J Li, YK LiDemarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Mandrichenko, IV Mangeot, P Mani, S Mansoulie, B Mao, HS Margulies, S Markeloff, R Markosky, L Marshall, T Martin, MI Marx, M May, B Mayorov, AA McCarthy, R McKibben, T McKinley, J McMahon, T Melanson, HL Neto, JRTD Merritt, KW Miettinen, H Milder, A Mincer, A deMiranda, JM Mishra, CS MohammadiBaarmand, M Mokhov, N Mondal, NK Montgomery, HE Mooney, P Mudan, M Murphy, C Murphy, CT Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Neis, E Nemethy, P Nesic, D Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, CH Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peryshkin, A Peters, M Piekarz, H Pischalnikov, Y Pluquet, A Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Puseljic, D Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rao, MVS Rapidis, PA Rasmussen, L Read, AL Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rusin, S Rutherfoord, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shao, YY Shivpuri, RK Shupe, M Singh, JB Sirotenko, V Smart, W Smith, A Smith, RP Snihur, R Snow, GR Snyder, S Solomon, J Sood, PM Sosebee, M Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stoianova, DA Stoker, D Streets, K Strovink, M Sznajder, A Taketani, A Tamburello, P Tarazi, J Tartaglia, M Taylor, TL Teiger, J Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Virador, PRG Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Wang, J Warchol, J Wayne, M Weerts, H Wen, F Wenzel, WA White, A White, JT Wightman, JA Wilcox, J Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yoshikawa, C Youssef, S Yu, J Yu, Y Zhang, DH Zhang, Y Zhu, Q Zhu, ZH Zieminska, D Zieminski, A Zylberstejn, A TI Studies of topological distributions of inclusive three- and four-jet events in p(p)over-bar collisions at root s=1800GeV with the D0 detector SO PHYSICAL REVIEW D LA English DT Article ID SOFT GLUON INTERFERENCE; MONTE-CARLO; E+E ANNIHILATION; QCD JETS; PARTON DISTRIBUTIONS; HADRON COLLIDERS; CROSS-SECTIONS; PPBAR COLLIDER; 3-JET EVENTS; SCATTERING AB The global topologies of inclusive three- and four-jet events produced in (p) over bar p interactions are described. The three- and four-jet events are selected from data recorded by the D0 detector at the Fermilab Tevatron Collider operating at a center-of-mass energy of root s = 1800 GeV. The measured, normalized distributions of various topological variables are compared with parton-level predictions of tree-level QCD calculations. The parton-level QCD calculations are found to be in good agreement with the data. The studies also show that the topological distributions of the different subprocesses involving different numbers of quarks are very similar and reproduce the measured distributions well. The parton-shower Monte Carlo generators provide a less satisfactory description of the topologies of the three- and four-jet events. C1 UNIV LOS ANDES,BOGOTA,COLOMBIA. UNIV ARIZONA,TUCSON,AZ 85721. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF IRVINE,IRVINE,CA 92717. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,RIO JANEIRO,BRAZIL. CINVESTAV IPN,MEXICO CITY,DF,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV DELHI,DELHI 110007,INDIA. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHICAGO,IL 60607. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. KOREA UNIV,SEOUL 136701,SOUTH KOREA. KYUNGSUNG UNIV,PUSAN,SOUTH KOREA. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,COLLEGE PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW,RUSSIA. UNIV NEBRASKA,LINCOLN,NE 68588. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV OKLAHOMA,NORMAN,OK 73019. PANJAB UNIV,CHANDIGARH 160014,INDIA. INST HIGH ENERGY PHYS,PROTVINO 142284,RUSSIA. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77251. UNIV ESTADUAL RIO DE JANEIRO,RIO JANEIRO,BRAZIL. UNIV ROCHESTER,ROCHESTER,NY 14627. SEOUL NATL UNIV,SEOUL,SOUTH KOREA. CTR ETUD SACLAY,CEA,DAPNIA,SERV PHYS PARTICLES,SACLAY,FRANCE. SUNY STONY BROOK,STONY BROOK,NY 11794. SSC LAB,DALLAS,TX 75237. TATA INST FUNDAMENTAL RES,BOMBAY 400005,MAHARASHTRA,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLLEGE STN,TX 77843. RP Abachi, S (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Taketani, Atsushi/E-1803-2017; Sznajder, Andre/L-1621-2016; Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Leflat, Alexander/D-7284-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; de Mello Neto, Joao/C-5822-2013 OI Taketani, Atsushi/0000-0002-4776-2315; Sznajder, Andre/0000-0001-6998-1108; Aihara, Hiroaki/0000-0002-1907-5964; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Kim, Sun Kee/0000-0002-0013-0775; de Mello Neto, Joao/0000-0002-3234-6634 NR 57 TC 24 Z9 24 U1 0 U2 4 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 JUN 1 PY 1996 VL 53 IS 11 BP 6000 EP 6016 DI 10.1103/PhysRevD.53.6000 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500002 ER PT J AU Mar, NM Lee, ER Fleming, GR Casey, BCK Perl, ML Garwin, EL Hendricks, CD Lackner, KS Shaw, GL AF Mar, NM Lee, ER Fleming, GR Casey, BCK Perl, ML Garwin, EL Hendricks, CD Lackner, KS Shaw, GL TI Improved search for elementary particles with fractional electric charge SO PHYSICAL REVIEW D LA English DT Article ID MATTER; NIOBIUM AB We have devised and demonstrated the successful operation of a low-cost, high-mass throughput technique capable of performing bulk matter searches for fractionally charged particles based on an improved Millikan liquid drop method. The method uses a stroboscopic lamp and a charge coupled device video camera to image the trajectories of silicone oil drops falling through air in the presence of a vertical, alternating electric field. The images of the trajectories are computer processed in real time, the electric charge on a drop being measured with an rms error of 0.025 of an electron charge. This error is dominated by Brownian motion. In the first use of this method, we have looked at 5 974 941 drops and found no evidence for fractional charges in 1.07 mg of oil. With 95% confidence, the concentration of isolated quarks with +/-1/3e or +/-2/3e in silicone oil is less than one per 2.14 X 10(20) nucleons. C1 WJ SCAFER ASSOCIATES,LIVERMORE,CA 94550. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. RP Mar, NM (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. RI Fleming, George/L-6614-2013 OI Fleming, George/0000-0002-4987-7167 NR 23 TC 18 Z9 18 U1 1 U2 9 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 JUN 1 PY 1996 VL 53 IS 11 BP 6017 EP 6032 DI 10.1103/PhysRevD.53.6017 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500003 ER PT J AU Coan, TE Dominick, J Fadeyev, V Korolkov, L Lambrecht, M Sanghera, S Shelkov, V Stroynowski, R Volobouev, I Wei, G Artuso, M Efimov, A Gao, M Goldberg, M He, D Horwitz, N Kopp, S Moneti, GC Mountain, R Mukhin, Y Playfer, S Skwarnicki, T Stone, S Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Freyberger, A Gibaut, D Kinoshita, K Pomianowski, P Schrenk, S Cinabro, D Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Athanas, M Bliss, DW Brower, WS Masek, G Paar, HP Gronberg, J Korte, CM Kutschke, R Menary, S Morrison, RJ Nakanishi, S Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Tajima, H Witherell, MS Balest, R Cho, K Ford, WT Lohner, M Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Dumas, DJ Ehrlich, R ELia, R Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Jones, CD Jones, SL Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Avery, P Prescott, C Yang, S Yelton, J Brandenburg, G Briere, RA Liu, T Saulnier, M Wilson, R Yamamoto, H Browder, TE Li, F Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Palmer, M Selen, M Thaler, JJ Edwards, KW McLean, KW Ogg, M Bellerive, A Britton, DI Janicek, R MacFarlane, DB Patel, PM Spaan, B Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Copty, N Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Kubota, Y Lattery, M Nelson, JK Patton, S Poling, R Riehle, T Savinov, V Alam, MS Kim, IJ Ling, Z Mahmood, AH ONeill, JJ Severini, H Sun, CR Timm, S Wappler, F Duboscq, JE Fulton, R Fujino, D Gan, KK Honscheid, K Kagan, H Kass, R Lee, J Sung, M Undrus, A White, C Wanke, R Wolf, A Zoeller, MM Fu, X Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Miao, T Miller, DH Modesitt, M Shibata, EI Shipsey, IPJ Wang, PN Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Wang, R AF Coan, TE Dominick, J Fadeyev, V Korolkov, L Lambrecht, M Sanghera, S Shelkov, V Stroynowski, R Volobouev, I Wei, G Artuso, M Efimov, A Gao, M Goldberg, M He, D Horwitz, N Kopp, S Moneti, GC Mountain, R Mukhin, Y Playfer, S Skwarnicki, T Stone, S Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Freyberger, A Gibaut, D Kinoshita, K Pomianowski, P Schrenk, S Cinabro, D Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Athanas, M Bliss, DW Brower, WS Masek, G Paar, HP Gronberg, J Korte, CM Kutschke, R Menary, S Morrison, RJ Nakanishi, S Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Tajima, H Witherell, MS Balest, R Cho, K Ford, WT Lohner, M Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Dumas, DJ Ehrlich, R ELia, R Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Jones, CD Jones, SL Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Avery, P Prescott, C Yang, S Yelton, J Brandenburg, G Briere, RA Liu, T Saulnier, M Wilson, R Yamamoto, H Browder, TE Li, F Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Palmer, M Selen, M Thaler, JJ Edwards, KW McLean, KW Ogg, M Bellerive, A Britton, DI Janicek, R MacFarlane, DB Patel, PM Spaan, B Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Copty, N Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Kubota, Y Lattery, M Nelson, JK Patton, S Poling, R Riehle, T Savinov, V Alam, MS Kim, IJ Ling, Z Mahmood, AH ONeill, JJ Severini, H Sun, CR Timm, S Wappler, F Duboscq, JE Fulton, R Fujino, D Gan, KK Honscheid, K Kagan, H Kass, R Lee, J Sung, M Undrus, A White, C Wanke, R Wolf, A Zoeller, MM Fu, X Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Miao, T Miller, DH Modesitt, M Shibata, EI Shipsey, IPJ Wang, PN Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Wang, R TI Decays of tau leptons to final states containing K-S(0) mesons SO PHYSICAL REVIEW D LA English DT Article ID AXIAL-VECTOR MESONS; MONTE-CARLO; NU-TAU; NEUTRINO MASS; LIBRARY; LIMIT; CURRENTS AB Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we have studied the decays of tau leptons produced through e(+)e(-) annihilation into final states containing K-S(0) mesons, observed through their decays to pi(+)pi(-). We present branching fractions for decays to five final states: tau(-)-->K(0)h(-)nu(tau), tau(-)-->K(0)h(-)pi(0) nu(tau), tau(-)K(0)K(-)nu(tau), tau(-)-->K(0)K(-)pi(0) nu(tau), and tau(-)-->K(S)(0)K(S)(0)h(-)nu(tau), where K(0)h(-) denotes the sum of the processes involving (K) over bar(0) pi(-) and (KK-)-K-0 particle combinations. Substructure and mass spectra in these final states are also addressed. C1 SYRACUSE UNIV, SYRACUSE, NY 13244 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. 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, CHAMPAIGN, 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. BINP, NOVOSIBIRSK 630090, RUSSIA. RP SO METHODIST UNIV, DALLAS, TX 75275 USA. RI Schaffner, Stephen/D-1189-2011; Britton, David/F-2602-2010; Briere, Roy/N-7819-2014; OI Britton, David/0000-0001-9998-4342; Briere, Roy/0000-0001-5229-1039; Poling, Ronald/0000-0001-7305-4702; Bloom, Kenneth/0000-0002-4272-8900 NR 49 TC 32 Z9 32 U1 1 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 JUN 1 PY 1996 VL 53 IS 11 BP 6037 EP 6053 DI 10.1103/PhysRevD.53.6037 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500005 ER PT J AU Greenwood, ZD Kropp, WR Mandelkern, MA Nakamura, S PasierbLove, EL Price, LR Reines, F Riley, SP Sobel, HW Gurr, HS AF Greenwood, ZD Kropp, WR Mandelkern, MA Nakamura, S PasierbLove, EL Price, LR Reines, F Riley, SP Sobel, HW Gurr, HS TI Results of a two-position reactor neutrino-oscillation experiment SO PHYSICAL REVIEW D LA English DT Article ID ANTINEUTRINO AB A search for vacuum neutrino oscillations in the range Delta m(2)>0.01 eV(2) with sin(2)2 theta>0.05 was performed with a detector placed at two different distances (18 and 24 m) from a production reactor at the Savannah River Site. The results observed are inconsistent with oscillations in this region and consistent with other reactor experiments. C1 SAVANNAH RIVER SITE,AIKEN,SC 29808. UNIV S CAROLINA,DEPT PHYS SCI,AIKEN,SC 29808. RP Greenwood, ZD (reprint author), UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717, USA. RI Sobel, Henry/A-4369-2011 NR 17 TC 37 Z9 37 U1 1 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 JUN 1 PY 1996 VL 53 IS 11 BP 6054 EP 6064 DI 10.1103/PhysRevD.53.6054 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500006 ER PT J AU Rizzo, TG AF Rizzo, TG TI Single top quark production as a probe for anomalous moments at hadron colliders SO PHYSICAL REVIEW D LA English DT Article ID EFFECTIVE-W-APPROXIMATION; PARTON MODEL; HEAVY QUARK; POLARIZATION; COLLISIONS AB Single production of top quarks at hadron colliders via gW fusion is examined as a probe of possible anomalous chromomagnetic and/or chromoelectric moment type couplings between the top quark and gluons. We find that this channel is far less sensitive to the existence of anomalous couplings of this kind than is the usual production of top quark pairs by gg or q (q) over bar fusion, The contribution to the cross section and various kinematical distributions from anomalous couplings with interesting magnitudes is essentially hidden by the present theoretical uncertainties in the calculation. This result is found to hold at both the Fermilab Tevatron as well as the CERN LHC, although somewhat greater sensitivity for anomalous couplings in this channel is found at the higher energy machine. RP Rizzo, TG (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 45 TC 44 Z9 44 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 JUN 1 PY 1996 VL 53 IS 11 BP 6218 EP 6225 DI 10.1103/PhysRevD.53.6218 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500022 ER PT J AU Baer, H Chen, CH Paige, F Tata, X AF Baer, H Chen, CH Paige, F Tata, X TI Signals for minimal supergravity at the CERN large hadron collider .2. Multilepton channels SO PHYSICAL REVIEW D LA English DT Article ID SQUARK DECAYS; SUPERSYMMETRY; GLUINO; DEPENDENCE; PHYSICS; QUARKS; LEP AB We use ISAJET to perform a detailed study of the multilepton signals expected from cascade decays of supersymmetric particle produced at the CERN LHC. Our analysis is performed within the framework of the minimal supergravity model with gauge coupling unification and radiative electroweak symmetry breaking. We delineate the regions-of parameter space where jets plus missing energy plus 1, 2 (opposite-sign and same-sign dileptons), and 3 isolated lepton events should be visible above standard model backgrounds. We find that if any E(T) signal at the LHC is to be attributed to gluino and/or squark production, and if m((g) over tilde)less than or similar to 1 TeV, then several of these signals must be simultaneously observable. Furthermore, assuming 10 fb(-1) of integrated luminosity, we find that the reach for supersymmetry in the 1l+jets+E(T), channel extends to m((g) over tilde) 2300(1600) GeV for m((q) over tilde)similar to m((g) over tilde)(m((q) over tilde)similar to 1.5m((g) over tilde)), and exceeds the corresponding reach in the Ol+E(T) channel. We show that measurements of the various topological cross sections, jet, and B-hadron multiplicities in these events, together with the charge asymmetry for single lepton and same-sign dilepton events, and flavor asymmetry for opposite-sign dilepton events, serve to narrow the allowed range of underlying SUGRA parameter values. We also delineate parameter regions where signals with clean isolated dilepton (from slepton production) and trilepton events (from chargino or neutralino production) are visible at the LHC, and examine the extent to which these signals can be separated from other SUSY sources. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV HAWAII,DEPT PHYS & ASTRON,HONOLULU,HI 96822. RP Baer, H (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 57 TC 212 Z9 212 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 JUN 1 PY 1996 VL 53 IS 11 BP 6241 EP 6264 DI 10.1103/PhysRevD.53.6241 PG 24 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500024 ER PT J AU Blankenbecler, R Drell, SD AF Blankenbecler, R Drell, SD TI Landau-Pomeranchuk-Migdal effect for finite target SO PHYSICAL REVIEW D LA English DT Article AB In this paper the high-energy expansion for scattering from extended-targets that the authors previously applied to beamstrahlung radiation and pair production is applied to the problem of radiation in a medium with multiple scattering. The suppression of the emission of long-wavelength photons, the Landau-Pomeranchuk-Migdal effect, is treated and explained in physical terms. This treatment of single-photon emission extends previous classical treatments of the problem to the quantum domain and corrects certain approximations made in these earlier works. The effects of finite target thickness is treated. A quantum treatment of multiple scattering is also given to aid in the physical interpretation of the suppression effect and to completely define our model of multiple scattering. RP Blankenbecler, R (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 22 TC 59 Z9 59 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 JUN 1 PY 1996 VL 53 IS 11 BP 6265 EP 6281 DI 10.1103/PhysRevD.53.6265 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500025 ER PT J AU Carone, CD Hall, LJ Murayama, H AF Carone, CD Hall, LJ Murayama, H TI (S-3)(3) flavor symmetry and p->K(0)e(+) SO PHYSICAL REVIEW D LA English DT Article ID NUCLEON DECAY; PROTON DECAY; MASSES; MODELS; SU(5) AB We show how to incorporate the lepton sector in a supersymmetric theory of flavor based on the discrete flavor group (S-3)(3). Assuming that all possible nonrenormalizable operators ate generated at the Planck scale, we show that the transformation properties of the leptons and of the flavor-symmetry-breaking fields are uniquely determined. We then demonstrate that the model has a viable phenomenology and makes one very striking prediction: the nucleon decays predominantly to Kl where l is a first generation lepton. We show that the modes n-->K-0<(nu)over bar>(e), p-->K+<(nu)over bar>(e), and p-->K(0)e(+) occur at comparable rates, and could well be discovered simultaneously at the SuperKamiokande experiment. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP Carone, CD (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. RI Murayama, Hitoshi/A-4286-2011 NR 38 TC 63 Z9 63 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 JUN 1 PY 1996 VL 53 IS 11 BP 6282 EP 6291 DI 10.1103/PhysRevD.53.6282 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500026 ER PT J AU Bhattacharya, T Gupta, R Kilcup, G Sharpe, S AF Bhattacharya, T Gupta, R Kilcup, G Sharpe, S TI Hadron spectrum with Wilson fermions SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL PERTURBATION-THEORY; QCD AB We present results of a high statistics study of the quenched spectrum using Wilson fermions at beta=6.0 on 32(3)x64 lattices. We calculate the masses of mesons and baryons composed of both degenerate and nondegenerate quarks. Using nondegenerate quark combinations allows us to study baryon mass splittings in detail. We find significant deviations from the lowest order chiral expansion, deviations that are consistent with the expectations of quenched chiral perturbation theory. We find that there is a similar to 20% systematic error in the extracted value of m(s), depending on the meson mass ratio used to set its value. Using the largest estimate of m(s) we find that the extrapolated octet mass splittings are in agreement with the experimental values, as is M(Delta)-M(N), while the decuplet splittings are 30% smaller than experiment. Combining our results with data from the GF11 collaboration we find considerable ambiguity in the extrapolation to the continuum limit. Our preferred values are M(N)/M(rho)=1.38(7) and M(Delta)/M(rho)=1.73(10), suggesting that the quenched approximation is good to only similar to 10-15%. We also analyze the O(ma) discretization errors in heavy quark masses. C1 OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RI Bhattacharya, Tanmoy/J-8956-2013 OI Bhattacharya, Tanmoy/0000-0002-1060-652X NR 31 TC 61 Z9 62 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 JUN 1 PY 1996 VL 53 IS 11 BP 6486 EP 6508 DI 10.1103/PhysRevD.53.6486 PG 23 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500043 ER PT J AU Moroi, T AF Moroi, T TI Muon anomalous magnetic dipole moment in the minimal supersymmetric standard model SO PHYSICAL REVIEW D LA English DT Article ID GRAND UNIFIED THEORIES; SUPERGRAVITY; ELECTROWEAK; GAUGE AB The muon anomalous magnetic dipole moment (MDM) is calculated in the framework of the minimal supersymmetric standard model (MSSM). In this paper, we discuss how the muon MDM depends on the parameters in the MSSM in detail. We show that the contribution of the superparticle loop becomes significant especially when tan beta is large. Numerically, it becomes of order 10(-8)-10(-9) in a wide parameter space, which is within the reach of the new Brookhaven E821 experiment. RP Moroi, T (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 41 TC 310 Z9 310 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 JUN 1 PY 1996 VL 53 IS 11 BP 6565 EP 6575 DI 10.1103/PhysRevD.53.6565 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UN905 UT WOS:A1996UN90500049 ER PT J AU Luscombe, JH Luban, M Reynolds, JP AF Luscombe, JH Luban, M Reynolds, JP TI Finite-size scaling of the Glauber model of critical dynamics SO PHYSICAL REVIEW E LA English DT Article AB We obtain the exact critical relaxation time tau(L)(xi), where xi is the bulk correlation length, for the Glauber kinetic Ising model of spins on a one-dimensional lattice of finite length L for both periodic and free boundary conditions (BC's). We show that, independent of the BC's, the dynamic critical exponent has the well-known value z=2, and we comment on a recent claim that z=1 for this model. The ratio tau(L)(xi)/tau(infinity)(xi), in the double limit L,xi-->infinity for fixed x=L/xi, approaches a limiting functional form, f(tau)(L/xi), the finite-size scaling function. For free BC's we derive the exact scaling function f(tau)(x) = [1+(omega(x)/(x)(2)](-1), where omega(x) is the smallest root of the transcendental equation omega tan(omega/2)=x. We provide expansions of omega(x) in powers of x and x(-1) for the regimes of small and large x, respectively, and establish their radii of convergence. The scaling function shows anomalous behavior at small x, f(tau)(x)approximate to x, instead of the usual f(tau)(x)approximate to x(z), as x-->O. This is because, even for finite L, the lifetime of the slowest dynamical mode diverges for T-->0 K. For periodic BC's, with the exception of one system, sigma(L) is independent of L, and hence f(tau)=1. The exceptional system, that with an odd number of spins and antiferromagnetic couplings, exhibits frustration at T=O K, and the scaling function is given by f(tau)(x)=[1+(pi/x)(2)](-1). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP Luscombe, JH (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 17 TC 34 Z9 34 U1 0 U2 3 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 JUN PY 1996 VL 53 IS 6 BP 5852 EP 5860 DI 10.1103/PhysRevE.53.5852 PN A PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR606 UT WOS:A1996UR60600044 ER PT J AU Singh, P AF Singh, P TI Dynamics of an assembly of finite-size Lennard-Jones spheres SO PHYSICAL REVIEW E LA English DT Article ID POLYMERIZED LATEX-PARTICLES; ANGLE NEUTRON-SCATTERING; MORPHOLOGY AB The time-averaged Fourier spectra of the number density, velocity, and force fields are obtained numerically for an assembly of spherical particles interacting via the Lennard-Jones potential. The magnitude spectra determine the dominant wave numbers, and the phase difference between the Lennard-Jones force and number density spectra determines the nature of the particle dynamics. The latter is used to show that for every wave number k there is a critical frequency omega(c)(k), such that when omegaomega(c)(k) the phase difference is -pi/2. The ratio of the frequency and the wave number at which the phase difference changes sign is used to define an effective sound speed for the particle system. The effective sound speed is shown to be a function of the dimensionless wave number, and is locally minimum at the same dimensionless wave numbers for which the static structure factor is minimum. It is also shown that the dynamical response of the particle system for waves with speeds greater than the effective sound speed is similar to the response of the hyperbolic systems of equations, and for waves with speeds smaller than the effective sound speed the response is similar to the response of the elliptic systems. The convection effects are shown to be of the same order of magnitude as the Lennard-Jones forces, and the change of type of the equations from hyperbolic to elliptic occurs when the magnitude of the convection term is comparable to the magnitude of the Lennard-Jones force term. It is also shown that the change of type cannot occur in a theory where the convection term is neglected. RP Singh, P (reprint author), LOS ALAMOS NATL LAB,ENGN SCI & APPLICAT ENERGY & PROC ENGN,MAIL STOP J576,LOS ALAMOS,NM 87545, USA. NR 19 TC 5 Z9 5 U1 0 U2 0 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 JUN PY 1996 VL 53 IS 6 BP 5904 EP 5915 DI 10.1103/PhysRevE.53.5904 PN A PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR606 UT WOS:A1996UR60600050 ER PT J AU Doering, CR Constantin, P AF Doering, CR Constantin, P TI Variational bounds on energy dissipation in incompressible flows .3. Convection SO PHYSICAL REVIEW E LA English DT Article ID RAYLEIGH-BENARD CONVECTION; HARD-TURBULENT CONVECTION; SHEAR-DRIVEN TURBULENCE; NUMERICAL EVIDENCE; 2 DIMENSIONS; NUMBER AB Building on a method of analysis for the Navier-Stokes equations introduced by Hopf [Math. Ann. 117, 764 (1941)], a variational principle for upper bounds on the largest possible time averaged convective heat flux is derived from the Boussinesq equations of motion. When supplied with appropriate test background fields satisfying a spectral constraint, reminiscent of an energy stability condition, the variational formulation produces rigorous upper bounds on the Nusselt number (Nu) as a function of the Rayleigh number (Ra). For the case of vertical heat convection between parallel plates in the absence of sidewalls, a simplified (but rigorous) formulation of the optimization problem yields the large Rayleigh number bound Nu less than or equal to 0.167 Ra-1/2-1. Nonlinear Euler-Lagrange equations for the optimal background fields are also derived, which allow us to make contact with the upper bound theory of Howard [J. Fluid Mech. 17, 405 (1963)] for statistically stationary flows. The structure of solutions of the Euler-Lagrange equations are elucidated from the geometry of the variational constraints, which sheds light on Busse's [J. Fluid Mech. 37, 457 (1969)] asymptotic analysis of general solutions to Howard's Euler-Lagrange equations. The results of our analysis are discussed in the context of theory, recent experiments, and direct numerical simulations. C1 UNIV CHICAGO,DEPT MATH,CHICAGO,IL 60637. RP Doering, CR (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. NR 44 TC 109 Z9 110 U1 2 U2 18 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 JUN PY 1996 VL 53 IS 6 BP 5957 EP 5981 DI 10.1103/PhysRevE.53.5957 PN A PG 25 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR606 UT WOS:A1996UR60600054 ER PT J AU Ramshaw, JD Chang, CH AF Ramshaw, JD Chang, CH TI Multicomponent diffusion in two-temperature magnetohydrodynamics SO PHYSICAL REVIEW E LA English DT Article ID GAS-MIXTURES; PLASMAS AB A recent hydrodynamic theory of multicomponent diffusion in multitemperature gas mixtures [J. D. Ramshaw, J. Non-Equilib. Thermodyn. 18, 121 (1993)] is generalized to include the velocity-dependent Lorentz force on charged species in a magnetic field B. This generalization is used to extend a previous treatment of ambipolar diffusion in two-temperature multicomponent plasmas [J. D. Ramshaw and C. H. Chang, Plasma Chem. Plasma Process. 13, 489, (1993)] to situations in which B and the electrical current density are nonzero. General expressions are thereby derived for the species diffusion fluxes, including thermal diffusion, in both single- and two-temperature multicomponent magnetohydrodynamics (MHD). It is shown that the usual zero-field form of the Stefan-Maxwell equations can be preserved in the presence of B by introducing generalized binary diffusion tensors dependent on B. A self-consistent effective binary diffusion approximation is presented that provides explicit approximate expressions for the diffusion fluxes. Simplifications due to the small electron mass are exploited to obtain an ideal MHD description in which the electron diffusion coefficients drop out, resistive effects vanish, and the electric field reduces to a particularly simple form. This description should be well suited for numerical calculations. RP Ramshaw, JD (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 26 TC 27 Z9 27 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 JUN PY 1996 VL 53 IS 6 BP 6382 EP 6388 DI 10.1103/PhysRevE.53.6382 PN B PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700034 ER PT J AU Woolsey, NC Asfaw, A Hammel, B Keane, C Back, CA Calisti, A Mosse, C Stamm, R Talin, B Wark, JS Lee, RW Klein, L AF Woolsey, NC Asfaw, A Hammel, B Keane, C Back, CA Calisti, A Mosse, C Stamm, R Talin, B Wark, JS Lee, RW Klein, L TI Spectroscopy of compressed high energy density matter SO PHYSICAL REVIEW E LA English DT Article ID INERTIAL CONFINEMENT FUSION; PLASMAS; EMITTERS AB A theoretical and experimental time-resolved spectroscopic investigation of indirectly driven microsphere implosions is described. The plasma dynamics is studied for several fill gases with a trace amount of argon. Through an analysis of the line profile of Ar XVII 1s(2)-1s(3)p P-1, with a line center position at E(v) = 3684 eV, the evolution of the plasma density and temperature as a function of fill gas is examined. The theoretical calculations are performed with a fast computer code, which has been previously benchmarked through the analysis of specific complex ionic spectra in hot dense plasmas. The experimental aspect of the work utilizes the Lawrence Livermore National Laboratory Nova 10 beam laser facility to indirectly drive the implosion of a gas filled plastic microsphere contained in a gold Holhraum target. The dynamical density measurement is derived from a streak camera linewidth measurement and a comparison with the computed profile. Calculations demonstrate that in certain cases there can be a substantial ion dynamics effect on the line shape. The frequency fluctuation model is used to compute the effect on the line profile and a comparison with the experimental spectra provides evidence that ion dynamics may be affecting the Line shape. This study provides a method for obtaining an improved understanding of the basic processes dominating the underlying plasma physics of matter compressed to a state of high energy density. C1 UNIV AIX MARSEILLE 1,URA 773 CASE 232,CTR ST JEROME,F-13397 MARSEILLE 20,FRANCE. UNIV OXFORD,CLARENDON LAB,DEPT PHYS,OXFORD OX1 3PU,ENGLAND. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. HOWARD UNIV,DEPT PHYS,WASHINGTON,DC 20059. RP Woolsey, NC (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-399,LIVERMORE,CA 94550, USA. RI Mosse, Caroline/F-9192-2013; OI Calisti, Annette/0000-0001-6727-9286 NR 19 TC 32 Z9 32 U1 0 U2 4 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 JUN PY 1996 VL 53 IS 6 BP 6396 EP 6402 DI 10.1103/PhysRevE.53.6396 PN B PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700036 ER PT J AU Lihn, HC Kung, P Settakorn, C Wiedemann, H Bocek, D AF Lihn, HC Kung, P Settakorn, C Wiedemann, H Bocek, D TI Measurement of subpicosecond electron pulses SO PHYSICAL REVIEW E LA English DT Article AB A bunch-length measuring method has been developed to measure the subpicosecond electron pulses generated at the Stanford University Short Intense Electron Source (SUNSHINE) facility. This method utilizes a far-infrared Michelson interferometer to measure coherent transition radiation emitted at wavelengths longer than or equal to the bunch length via optical autocorrelation. To analyze the measurement, a simple and systematic way has also been developed, which considers interference effects on the interferogram caused by the beam splitter; hence the electron bunch length can be easily obtained from the measurement. This simple, low-cost, frequency-resolved autocorrelation method demonstrates subpicosecond resolving power that cannot be achieved by existing time-resolved methods. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94309. RP Lihn, HC (reprint author), STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94309, USA. NR 16 TC 60 Z9 62 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 JUN PY 1996 VL 53 IS 6 BP 6413 EP 6418 DI 10.1103/PhysRevE.53.6413 PN B PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700038 ER PT J AU Konotop, VV Cai, D Salerno, M Bishop, AR GronbechJensen, N AF Konotop, VV Cai, D Salerno, M Bishop, AR GronbechJensen, N TI Interaction of a soliton with point impurities in an inhomogeneous, discrete nonlinear Schrodinger system SO PHYSICAL REVIEW E LA English DT Article ID DIFFERENTIAL-DIFFERENCE EQUATIONS; DYNAMIC LOCALIZATION; ELECTRIC-FIELD; LATTICE; PARTICLE AB We develop a comprehensive perturbation theory for the inhomogeneous, discrete one-dimensional nonlinear Schrodinger equation based on the inverse scattering transform. We also discuss single-soliton dynamics within the adiabatic approximation and derive higher order corrections to this approximation. Using this perturbation theory, we study in detail the motion of a soliton interacting with a point impurity, either nondissipative or dissipative, in the presence of a spatially linear potential. We predict that there are two kinds of dynamical localization of a soliton in the presence of the nondissipative impurity, depending on the impurity strength. One is the usual dynamical localization, which is qualitatively the same as the one in the absence of the impurity, and the other is the pinning of a soliton by an impurity of sufficient strength. The predictions of these phenomena and their various dynamical properties are confirmed by numerical simulations of the full system. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV SALERNO,DEPT THEORET PHYS,I-84100 SALERNO,ITALY. RP Konotop, VV (reprint author), UNIV MADEIRA,DEPT FIS,CTR CIENCIAS MATEMATICAS,PRACA MUNICIPIO,P-9000 FUNCHAL,PORTUGAL. RI Salerno, Mario/B-1732-2012; Konotop, Vladimir/C-6664-2012; Konotop, Vladimir/E-6964-2011 OI Salerno, Mario/0000-0002-1443-7858; Konotop, Vladimir/0000-0002-1398-3910 NR 18 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1996 VL 53 IS 6 BP 6476 EP 6485 DI 10.1103/PhysRevE.53.6476 PN B PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700045 ER PT J AU Bonca, J Gubernatis, JE AF Bonca, J Gubernatis, JE TI Real-time dynamics from imaginary-time quantum Monte Carlo simulations: Tests on oscillator chains SO PHYSICAL REVIEW E LA English DT Article ID MAXIMUM-ENTROPY; SYSTEMS AB We used methods of Bayesian statistical inference and the principle of maximum entropy to analytically continue imaginary-time Green's functions generated in quantum Monte Carlo simulations to obtain the real time Green's functions. For test problems, we considered chains of harmonic and anharmonic oscillators whose properties we simulated by a hybrid path-integral quantum Monte Carlo method. From the imaginary-time displacement-displacement Green's function, we first obtained its spectral density. For harmonic oscillators, we demonstrated the peaks of this function were in the correct position and their areas satisfied a sum rule. Additionally, as a function of wave number, the peak positions followed the correct dispersion relation. For a double-well oscillator, we demonstrated that the peak location correctly predicted the tunnel splitting. Transforming the spectral densities to real-time Green's functions, we conclude that we can predict the real-time dynamics for length of times corresponding to five to ten times the natural period of the model. The length of time was limited by an overbroadening of the peaks in the spectral density caused by the simulation algorithm. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 17 TC 17 Z9 17 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1539-3755 J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1996 VL 53 IS 6 BP 6504 EP 6513 DI 10.1103/PhysRevE.53.6504 PN B PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700049 ER PT J AU Datta, RP Altekar, SD Ray, AK AF Datta, RP Altekar, SD Ray, AK TI Computational model for coupled electron-photon transport in two dimensions SO PHYSICAL REVIEW E LA English DT Article ID ENERGY DEPOSITION; MULTIGROUP; PLASMAS AB We have developed a method to perform coupled electron-photon calculations in two spatial dimensions using a partial coupling scheme in which electrons produce photons but photons do not produce electrons. A spatial characteristic scheme is used in conjunction with a second order differencing scheme in energy. The multigroup Legendre cross sections are calculated using the cross section generating code CEPXS, which models a large number of electron interactions including elastic scattering from nuclei, inelastic scattering from collisions with atomic electrons, and radiative scattering from nuclei, and photon interactions such as Compton incoherent scattering, photoelectric absorption, and pair interaction. A two-dimensional calculation performed to simulate results from an experiment in which energy deposition depends only on the depth inside the medium compares very favorably with experimental data. Energy deposition profiles are also obtained for monoenergetic electron sources isotropically incident on aluminum and are compared with TIGER Monte Carlo calculations. Agreement between the two sets of calculations is found to be excellent. In summary, we conclude that our computational model is capable of providing very good results for energy deposition due to an incident source of electrons in two-dimensional rectangular geometry. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NATL CTR BASIC SCI,CALCUTTA 700064,W BENGAL,INDIA. RP Datta, RP (reprint author), UNIV TEXAS,DEPT PHYS,POB 19059,ARLINGTON,TX 76019, USA. NR 59 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1996 VL 53 IS 6 BP 6514 EP 6522 DI 10.1103/PhysRevE.53.6514 PN B PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700050 ER PT J AU Menon, SVG Goyal, PS Dasannacharya, BA Thiyagarajan, P AF Menon, SVG Goyal, PS Dasannacharya, BA Thiyagarajan, P TI Fractal scaling of small-angle neutron scattering from nonionic micellar solutions below the cloud temperature SO PHYSICAL REVIEW E LA English DT Article ID TRITON X-100; AMPHIPHILE; DIMENSION; COLLOIDS; POINT; SIZE AB Power-law variations of small-angle neutron-scattering intensities from nonionic micellar solutions of isooctylphenoxy polyethoxy ethanol (Triton X-100) in D2O for a range of concentrations (1-4 wt %) and temperatures (295-335 K) are interpreted in terms of simple models of fractal aggregates. The results show a large increase in dimensionality from similar to 1 at ambient temperature to similar to 2.3 near the cloud points. The variation of. fractal dimension with temperature is almost the same for the three concentrations studied. Thus one arrives at a picture of micellar aggregates becoming more and more tenuous as cloud points are approached. C1 BHABHA ATOM RES CTR,DIV SOLID STATE PHYS,BOMBAY 400085,MAHARASHTRA,INDIA. ARGONNE NATL LAB,ARGONNE,IL 60439. RP Menon, SVG (reprint author), BHABHA ATOM RES CTR,DIV THEORET PHYS,BOMBAY 400085,MAHARASHTRA,INDIA. NR 29 TC 4 Z9 4 U1 0 U2 0 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 JUN PY 1996 VL 53 IS 6 BP 6569 EP 6572 DI 10.1103/PhysRevE.53.6569 PN B PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR607 UT WOS:A1996UR60700060 ER PT J AU Kerstein, AR AF Kerstein, AR TI Intermittency interpretation of persistent small scale anisotropy in turbulence SO PHYSICAL REVIEW E LA English DT Article AB A model of small scale anisotropy in turbulence is motivated by the proposal that intermittency properties in turbulence are governed by direct coupling between the largest scales and inertial range length scales. A one-parameter hierarchy of scalar derivative moment dependences on Reynolds number Re is predicted. Enforcing the observed constancy of the skewness, divergences of higher moments are predicted. The results support the proposed extremal nature of intermittency scalings. RP Kerstein, AR (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1996 VL 53 IS 6 BP R5569 EP R5571 PN A PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR606 UT WOS:A1996UR60600009 ER PT J AU Liu, YM Ning, L Ecke, RE AF Liu, YM Ning, L Ecke, RE TI Dynamics of surface patterning in salt-crystal dissolution SO PHYSICAL REVIEW E LA English DT Article ID BINARY ALLOY; SOLIDIFICATION; MODEL AB We report an experimental study on the pattern dynamics of the salt-crystal (NaCl) surface when dissolved from below by its own aqueous solutions with mass concentrations between 0.0% and 24.0%. The surface pattern roughness grew exponentially for a range of unstable wave numbers with a fastest growing wave number k(c) and corresponding maximum growth rate sigma(c) which both decreased for higher solution concentrations. These results are compared with predictions of linear stability analysis and suggest a model for patterning by turbulent dissolution. RP Liu, YM (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,CONDENSED MATTER & THERMAL PHYS GRP,LOS ALAMOS,NM 87545, USA. NR 13 TC 0 Z9 0 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 JUN PY 1996 VL 53 IS 6 BP R5572 EP R5575 PN A PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA UR606 UT WOS:A1996UR60600010 ER PT J AU Donskov, SV Inyakin, AV Kachanov, VA Khaustov, GV Kolosov, VN Kondashov, AA Kulik, AV Landsberg, GL Lednev, AA Lishin, VA Polovnikov, SA Polyakov, VA Prokoshkin, YD Sadovsky, SA Samoylenko, VD Shagin, PM Shtannikov, AV Singovsky, AV Sobol, AE Sugonyaev, VP Bricman, C Stroot, JP Gouanere, M Peigneux, JP Poulet, M Alde, D Knapp, EA Inaba, S Kinashi, T Kobayashi, M Takamatsu, K Tsuru, T Binon, F Nakamura, T Boutemeur, M AF Donskov, SV Inyakin, AV Kachanov, VA Khaustov, GV Kolosov, VN Kondashov, AA Kulik, AV Landsberg, GL Lednev, AA Lishin, VA Polovnikov, SA Polyakov, VA Prokoshkin, YD Sadovsky, SA Samoylenko, VD Shagin, PM Shtannikov, AV Singovsky, AV Sobol, AE Sugonyaev, VP Bricman, C Stroot, JP Gouanere, M Peigneux, JP Poulet, M Alde, D Knapp, EA Inaba, S Kinashi, T Kobayashi, M Takamatsu, K Tsuru, T Binon, F Nakamura, T Boutemeur, M TI Observation of the a(4)(0) meson in the eta pi(0) decay channel SO PHYSICS OF ATOMIC NUCLEI LA English DT Article AB A mass-independent partial-wave analysis of the reaction pi(-)p -->eta pi(0)n is performed in the eta pi(0) mass range above 1.6 GeV. The analysis employs the S, P, D, F, and G waves and is based on experimental data collected with the GAMS-2000 multiphoton spectrometer in a 38-GeV/c pion beam extracted from the 70-GeV accelerator of IHEP. A resonance with quantum numbers J(PC)=4(++) and I-G=1(-) is observed in the G wave. Its mass and width are measured to be M=2010+/-20 MeV and Gamma=370+/-80 MeV. The mechanism of the observed a(4)(0)-meson production is dominated by natural-spin-parity exchange in the t channel. The measured unnatural-to-natural cross-section ratio is 0.60+/-0.16. C1 INST INTERUNIV SCI NUCL,B-1050 BRUSSELS,BELGIUM. LAB ANNECY LE VIEUX PHYS PARTICULES,F-74941 ANNECY LE VIEUX,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. FREE UNIV BRUSSELS,B-1050 BRUSSELS,BELGIUM. MIYAZAKI UNIV,MIYAZAKI,JAPAN. UNIV MONTREAL,MONTREAL,PQ H3C 3J7,CANADA. RP Donskov, SV (reprint author), INST HIGH ENERGY PHYS,PROTVINO 142284,RUSSIA. NR 19 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD JUN PY 1996 VL 59 IS 6 BP 982 EP 990 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA UW595 UT WOS:A1996UW59500010 ER PT J AU Almgren, R Bertozzi, A Brenner, MP AF Almgren, R Bertozzi, A Brenner, MP TI Stable and unstable singularities in the unforced Hele-Shaw cell SO PHYSICS OF FLUIDS LA English DT Article ID EULER EQUATIONS; VISCOUS FLOWS; GROWTH AB We study singularity formation in the lubrication model for the unforced Hele-Shaw system, describing the breaking in two of a fluid droplet confined between two narrowly spaced glass plates. By varying the initial data, we exhibit four different scenarios: (1) the droplet breaks in finite time, with two pinch points moving toward each other and merging at the singular time; (2) the droplet breaks in finite time, with two asymmetric pinch points propagating away from each other; (3) the droplet breaks in finite time, with a single symmetric pinch point; or (4) the droplet relaxes to a stable equilibrium shape without a finite time breakup. Each of the three singular scenarios has a self-similar structure with different scaling laws; the first scenario has not been observed before in other Hele-Shaw studies. We demonstrate instabilities of the second and third scenarios, in which the solution changes its behavior at a thickness that can be arbitrarily small depending on the initial condition. These transitions can be identified by examining the structure of the solution in the intermediate scaling region. (C) 1996 American Institute of Physics. C1 UNIV CHICAGO,DEPT MATH,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. DUKE UNIV,DEPT MATH,DURHAM,NC 27708. RP Almgren, R (reprint author), MIT,DEPT MATH,CAMBRIDGE,MA 02139, USA. RI Bertozzi, Andrea/A-1831-2012 OI Bertozzi, Andrea/0000-0003-0396-7391 NR 25 TC 45 Z9 48 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JUN PY 1996 VL 8 IS 6 BP 1356 EP 1370 DI 10.1063/1.868915 PG 15 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA UM418 UT WOS:A1996UM41800006 ER PT J AU Coppa, GGM Riccardo, V Lapenta, G AF Coppa, GGM Riccardo, V Lapenta, G TI Kinetic theory of charged particles of variable shape SO PHYSICS OF PLASMAS LA English DT Article AB Recently a new kind of computational technique for kinetic plasma simulation has been developed, making use of particles of variable shape (blobs). The aim of the present work is to derive a kinetic equation governing the evolution of the blobs and solve it in the case of small perturbations. Results are compared with those obtained for the real plasma and for a plasma of particles of fixed shape (the model usually employed in popular particle-in-cell simulations). The comparison is useful to find out whether the additional cost of dealing with more degrees of freedom is balanced by the superior accuracy provided by the new technique in describing the phase-space distribution. (C) 1996 American Institute of Physics. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP POLITECN TORINO, DIPARTIMENTO ENERGET, CORSO DUCA ABRUZZI 24, I-10129 TURIN, ITALY. OI Coppa, Gianni/0000-0002-1003-914X; riccardo, valeria/0000-0003-2535-5257; Lapenta, Giovanni/0000-0002-3123-4024 NR 10 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2229 EP 2238 DI 10.1063/1.871930 PG 10 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600005 ER PT J AU Brooks, JN AF Brooks, JN TI Analysis of noble gas recycling at a fusion plasma divertor SO PHYSICS OF PLASMAS LA English DT Article ID ROUGHNESS AB Near-surface recycling of neon and argon atoms and ions at a divertor has been studied using impurity transport and surface interaction codes. A fixed background deuterium-tritium plasma model is used corresponding to the International Thermonuclear Experimental Reactor (ITER) [ITER EDA Agreement and Protocol 2, ITER EDA Documentation Series No. 5 (International Atomic Energy Agency, Vienna, 1994)] radiative plasma conditions (T-e less than or equal to 10 eV). The noble gas transport depends critically on the divertor surface material. For low-Z materials (Be and C) both neon and argon recycle many (e.g., similar to 100) times before leaving the near-surface region. This is also true for an argon on tungsten combination. For neon on tungsten, however, there is low recycling. These variations are due to differences in particle and energy reflection coefficients, mass, and ionization rates. In some cases a high flux of recycling atoms is ionized within the magnetic sheath and this can change local sheath parameters. Due to inhibited backflow, high recycling, and possibly high sputtering, noble gas seeding (for purposes of enhancing radiation) may be incompatible with Be or C surfaces, for fusion reactor conditions. On the other hand, neon use appears compatible with tungsten. (C) 1996 American Institute of Physics. RP ARGONNE NATL LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 16 TC 7 Z9 7 U1 0 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2286 EP 2292 DI 10.1063/1.871911 PG 7 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600013 ER PT J AU Fidone, I Giruzzi, G Taylor, G AF Fidone, I Giruzzi, G Taylor, G TI Plasma diagnostics in the Tokamak Fusion Test Reactor using emission of electron cyclotron radiation at arbitrary frequencies SO PHYSICS OF PLASMAS LA English DT Article ID TFTR AB Emission of cyclotron radiation at arbitrary wave frequency for diagnostic purposes is discussed. It is shown that the radiation spectrum at arbitrary frequencies is more informative than the first few harmonics and it is suited for diagnosis of superthermal electrons without any ''ad hoc'' value of the wall reflection coefficient. Thermal radiation from the Tokamak Fusion Test Reactor (TFTR) [Fusion Technol. 21, 1324 (1992)] is investigated and it is shown that the bulk and the tail of the electron momentum distribution during strong neutral beam injection is a Maxwellian with a single temperature in all ranges of electron energies. (C) 1996 American Institute of Physics. C1 EURATOM,CEA,F-13108 ST PAUL DURANCE,FRANCE. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. NR 9 TC 17 Z9 17 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2331 EP 2336 DI 10.1063/1.871915 PG 6 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600017 ER PT J AU Finn, JM Gerwin, RA AF Finn, JM Gerwin, RA TI Mode coupling effects on resistive wall instabilities SO PHYSICS OF PLASMAS LA English DT Article ID PLASMAS AB It is shown that destabilization of resistive wall magnetohydrodynamic (MHD) modes in the presence of rotation is a mode coupling phenomenon. Based on this observation, certain unanticipated effects are readily explained. These include the fact that resistive wall modes with rotation can be unstable, even for parameters for which the MHD modes are stable with the wall at infinity, and the fact that this destabilization depends critically on the plasma parameters. (C) 1996 American Institute of Physics. RP Finn, JM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-15,MS K717,LOS ALAMOS,NM 87545, USA. NR 14 TC 20 Z9 20 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2344 EP 2348 DI 10.1063/1.871917 PG 5 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600019 ER PT J AU Rogers, B Zakharov, L AF Rogers, B Zakharov, L TI Collisionless m=1 reconnection in tokamaks SO PHYSICS OF PLASMAS LA English DT Article ID MAGNETIC RECONNECTION; NONLINEAR GROWTH; KINK INSTABILITY; TEARING MODE; PLASMAS AB In high temperature tokamak regimes, the m = 1 reconnecting mode is governed by two fluid effects associated with the electron skin-depth d(e) = c/omega(pe) and the ion sound radius rho(s) = c(s)/Omega(ci). To clarify the early nonlinear dynamics of this mode, numerical simulations of a two fluid model are presented. To simulate physically reasonable parameters in a tokamak geometry, an efficient approach is used in which only a narrow layer surrounding the q = 1 surface and m = 1 magnetic island must be simulated. In the usual tokamak case rho(s)>d(e), as well as the limit rho(s) = 0, the early nonlinear growth of the mode is faster than exponential due a broadening of the flow layer. This broadening appears to result from tension in the magnetic field lines, which acts to pull the layer open as the island grows. (C) 1996 American Institute of Physics. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP Rogers, B (reprint author), UNIV MARYLAND,INST PLASMA RES,COLLEGE PK,MD 20742, USA. NR 21 TC 32 Z9 32 U1 2 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2411 EP 2422 DI 10.1063/1.871925 PG 12 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600027 ER PT J AU Hartemann, FV LeSage, GP Troha, AL Luhmann, NC Fochs, SN AF Hartemann, FV LeSage, GP Troha, AL Luhmann, NC Fochs, SN TI Transform-limited coherent synchrotron radiation wavepackets in a chirped pulse free-electron laser SO PHYSICS OF PLASMAS LA English DT Article ID BEAM AB A novel source of transform-limited pulses of coherent electromagnetic radiation relying on the synchrotron radiation process in a fast wave guiding structure is investigated theoretically. An ultrashort electron bunch transversally accelerated by a periodic external field is considered. At grazing, where the bunch and group velocities are matched, the duration of the resulting ultrawideband chirped pulse is governed by group velocity dispersion instead of slippage. Because of the intimate connection between the rate of chirping and the bandwidth, the corresponding pulse duration is shown to be very close to the Fourier transform limit. In addition, the propagation of such chirped pulses through a guiding structure with negative group velocity dispersion is investigated both theoretically and computationally. The spectral and temporal characteristics of the chirped and compressed pulses are derived analytically. Detailed computer calculations complement this theoretical analysis. (C) 1996 American Institute of Physics. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP Hartemann, FV (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616, USA. NR 26 TC 5 Z9 5 U1 3 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2446 EP 2456 DI 10.1063/1.871706 PG 11 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600032 ER PT J AU Finn, JM Gerwin, RA AF Finn, JM Gerwin, RA TI Parallel transport in ideal magnetohydrodynamics and applications to resistive wall modes SO PHYSICS OF PLASMAS LA English DT Article ID INSTABILITY AB It is shown that in magnetohydrodynamics (MHD) with an ideal Ohm's law, in the presence of parallel heat flux, density gradient, temperature gradient, and parallel compression, but in the absence of perpendicular compressibility, there is an exact cancellation of the parallel transport terms. This cancellation is due to the fact that magnetic flux is advected in the presence of an ideal Ohm's law, and therefore parallel transport of temperature and density gives the same result as perpendicular advection of the same quantities. Discussions are also presented regarding parallel viscosity and parallel velocity shear, and the generalization to toroidal geometry. These results suggest that a correct generalization of the Hammett-Perkins fluid operator [G. W. Hammett and F. W. Perkins, Phys. Rev. Lett. 64, 3019 (1990)] to simulate Landau damping for electromagnetic modes must give an operator that acts on the dynamics parallel to the perturbed magnetic field lines. (C) 1996 American Institute of Physics. RP Finn, JM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-15,MS K717,LOS ALAMOS,NM 87545, USA. NR 14 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1996 VL 3 IS 6 BP 2469 EP 2471 DI 10.1063/1.871709 PG 3 WC Physics, Fluids & Plasmas SC Physics GA UN906 UT WOS:A1996UN90600036 ER PT J AU Sessler, AM Stix, TH AF Sessler, AM Stix, TH TI Build the International Thermonuclear Experimental Reactor? SO PHYSICS TODAY LA English DT Article C1 PRINCETON UNIV,PRINCETON,NJ 08544. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP Sessler, AM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1996 VL 49 IS 6 BP 21 EP 23 DI 10.1063/1.881499 PG 3 WC Physics, Multidisciplinary SC Physics GA UQ316 UT WOS:A1996UQ31600007 ER PT J AU Mekhedov, SL Kende, H AF Mekhedov, SL Kende, H TI Submergence enhances expression of a gene encoding 1-aminocyclopropane-1-carboxylate oxidase in deepwater rice SO PLANT AND CELL PHYSIOLOGY LA English DT Article DE 1-aminocyclopropane-1-carboxylic acid (ACC); cDNA; enzyme activity; gene expression; Oryza saliva L; submergence ID DEEP-WATER RICE; ETHYLENE-FORMING ENZYME; POLYMERASE CHAIN-REACTION; GROWTH-RESPONSE; MESSENGER-RNA; SEQUENCE; FRUIT; CDNA; GIBBERELLIN; SYNTHASE AB Partial submergence greatly stimulates internodal growth in deepwater rice (Oryza sativa L.). Previous work has shown that the effect of submergence is, at least in part, mediated by ethylene, which accumulates in the air spaces of submerged internodes. To investigate the expression of the genes encoding ethylene biosynthetic enzymes during accelerated growth of deepwater rice, we cloned a 1-amino-cyclopropane-1-carboxylate (ACC) oxidase cDNA (OS-ACO1) from internodes of submerged plants and measured the activity of the enzyme in tissue extracts with an improved assay. We found an increase in ACC oxidase mRNA levels and enzyme activity after 4 to 24 h of submergence. Thus, it is likely that ethylene biosynthesis in internodes of deepwater rice is controlled, at least in part, at the level of ACC oxidase. RP Mekhedov, SL (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. NR 23 TC 55 Z9 60 U1 2 U2 6 PU JAPANESE SOC PLANT PHYSIOLOGISTS PI KYOTO PA SHIMOTACHIURI OGAWA HIGASHI KAMIKYOKU, KYOTO 602, JAPAN SN 0032-0781 J9 PLANT CELL PHYSIOL JI Plant Cell Physiol. PD JUN PY 1996 VL 37 IS 4 BP 531 EP 537 PG 7 WC Plant Sciences; Cell Biology SC Plant Sciences; Cell Biology GA UR270 UT WOS:A1996UR27000015 PM 8759917 ER PT J AU Wang, N Zhang, HH Nobel, PS AF Wang, N Zhang, HH Nobel, PS TI Phloem-xylem water circulation model for developing cladodes of Opuntia ficus-indica SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES,DOE LAB,LOS ANGELES,CA 90095. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 142 EP 142 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400186 ER PT J AU Race, HL Hind, G AF Race, HL Hind, G TI Multiple protein kinases in thylakoid membranes SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 156 EP 156 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400200 ER PT J AU Hind, G Sheng, JS AF Hind, G Sheng, JS TI Polyphenol oxidase: Structure and function SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 2 U2 3 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 166 EP 166 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400210 ER PT J AU Zhang, HH Nobel, PS AF Zhang, HH Nobel, PS TI Seasonal dynamics of carboxylating enzymes and carbohydrate partitioning for a C-3, a C-4, and a CAM species under desert conditions SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES,DOE LAB,LOS ANGELES,CA 90095. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 191 EP 191 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400235 ER PT J AU Mitra, N Banton, K Kuske, CR Taylor, KC AF Mitra, N Banton, K Kuske, CR Taylor, KC TI Differential expression of genes during the Macrophylla decline disorder of citrus SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 UNIV ARIZONA,DEPT PLANT SCI,TUCSON,AZ 85721. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 283 EP 283 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400325 ER PT J AU Wang, N Zhang, HH Nobel, PS AF Wang, N Zhang, HH Nobel, PS TI What limits carbon assimilation during sink-to-source transition in Opuntia ficus-indica? SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES,DOE LAB,LOS ANGELES,CA 90095. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 367 EP 367 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400407 ER PT J AU Shi, LF Twary, SN Yoshioka, H Miller, SS Gregerson, RG Samac, DA Ganu, JS Unkefer, PJ Vance, CP AF Shi, LF Twary, SN Yoshioka, H Miller, SS Gregerson, RG Samac, DA Ganu, JS Unkefer, PJ Vance, CP TI Characterization of a nodule enhanced asparagine synthetase gene from alfalfa SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 USDA ARS,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NAGOYA UNIV,NAGOYA,AICHI 46101,JAPAN. LYON COLL,DIV NAT SCI,BATESVILLE,AR 72501. UNIV MINNESOTA,DEPT PLANT BIOL,ST PAUL,MN 55108. UNIV MINNESOTA,DEPT PLANT PATHOL,ST PAUL,MN 55108. UNIV MINNESOTA,DEPT AGRON & PLANT GENET,ST PAUL,MN 55108. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 393 EP 393 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400433 ER PT J AU Schwartz, SH Zeevaart, JAD LeonKloosterziel, KM Koornneef, M AF Schwartz, SH Zeevaart, JAD LeonKloosterziel, KM Koornneef, M TI Biochemical characterization of the aba2 and aba3 mutants in Arabidopsis thaliana. SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. AGR UNIV WAGENINGEN,DEPT GENET,6703 HA WAGENINGEN,NETHERLANDS. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 447 EP 447 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400487 ER PT J AU Xu, YL Zeevaart, JAD AF Xu, YL Zeevaart, JAD TI Expression of GA5 and its role in photoperiodic control of stem elongation in Arabidopsis thaliana SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 457 EP 457 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400497 ER PT J AU Peck, SC Kende, H AF Peck, SC Kende, H TI A single pea gene encoding an auxin-induced ACC synthase produces two transcripts with alternative 5' ends SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 479 EP 479 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400519 ER PT J AU Cho, HT Kende, H AF Cho, HT Kende, H TI Expansion and internodal growth in deepwater rice SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 628 EP 628 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400667 ER PT J AU Rosen, ES Poff, KL AF Rosen, ES Poff, KL TI Analysis of gene expression in gravitropism mutants of Arabidopsis thaliana SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 722 EP 722 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400760 ER PT J AU Tranel, PJ Keegstra, K AF Tranel, PJ Keegstra, K TI A novel, bipartite transit peptide targets OEP75 to the outer membrane of the chloroplastic envelope SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 757 EP 757 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400795 ER PT J AU Danhof, LR Bariola, PA Green, PJ AF Danhof, LR Bariola, PA Green, PJ TI Transformation of Arabidopsis by vacuum infiltration: A demonstration SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 769 EP 769 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400807 ER PT J AU Brandes, HK Larimer, FW Hartman, FC AF Brandes, HK Larimer, FW Hartman, FC TI Regulation of phosphoribulokinase by thioredoxin. SO PLANT PHYSIOLOGY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 2 TC 1 Z9 1 U1 0 U2 1 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1996 VL 111 IS 2 SU S BP 50003 EP 50003 PG 1 WC Plant Sciences SC Plant Sciences GA UR534 UT WOS:A1996UR53400023 ER PT J AU LaViolette, RA Berry, RA McGraw, R AF LaViolette, RA Berry, RA McGraw, R TI Homogeneous nucleation of metals in a plasma-quench reactor SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE homogeneous nucleation; metal vapors; supersonic flow nozzle; plasma quench reactor ID CORRESPONDING STATES CORRELATION; SCHEMES; GROWTH; VAPOR AB We present a new and general application of the method of moments for modeling the nucleation of condensates in a steady-state supersonic nozzle flow generatd in a plasma-quench reactor. A closed set of growth/evaporation rate equations has been employed to propagate the moments of the particle size distribution without invoking the usual coarse-graining or truncation approximations of conventional binning approaches. The method has been employed to calculate the nucleation rates. particle number density, and the particle-size distribution for 11 elemental metals (Ag, Al, Be, Ce, Cr, Fe, Gd, Ti, Th, U, and Zr) condensing in a model argon nozzle flow. We have identified the regions in the nozzle of maximum nucleation rate, and have shown how different particle-size distributions can develop in different regions. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP LaViolette, RA (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 28 TC 9 Z9 9 U1 0 U2 5 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4324 J9 PLASMA CHEM PLASMA P JI Plasma Chem. Plasma Process. PD JUN PY 1996 VL 16 IS 2 BP 249 EP 264 DI 10.1007/BF01570181 PG 16 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA UM013 UT WOS:A1996UM01300007 ER PT J AU Rice, BW Taylor, TS Burrell, KH Casper, TA Forest, CB Ikezi, H Lao, LL Lazarus, EA Mauel, ME Stallard, BW Strait, EJ AF Rice, BW Taylor, TS Burrell, KH Casper, TA Forest, CB Ikezi, H Lao, LL Lazarus, EA Mauel, ME Stallard, BW Strait, EJ TI The formation and evolution of negative central magnetic shear current profiles on DIII-D SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID D TOKAMAK; IMPROVED CONFINEMENT; ELONGATION; BETA AB Using the combination of early neutral beam injection, ramping of the plasma current, low electron density and controlled L-H transitions, robust discharges with negative central magnetic shear are reproducibly obtained on the DIII-D tokamak. The effects of these factors on the formation and evolution of the q profile during the initial phase of these discharges are documented. Details of the evolution of the inverted q profile are obtained from measurements of the internal field pitch using a 16-channel motional Stark effect (MSE) system. Time-dependent MSE data are used to directly construct the profile of the toroidal electric field and allow a straightforward calculation of the non-inductive current density profile. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA. OAK RIDGE NATL LAB,OAK RIDGE,TN. COLUMBIA UNIV,NEW YORK,NY. RP Rice, BW (reprint author), GEN ATOM CO,SAN DIEGO,CA 92186, USA. NR 36 TC 34 Z9 35 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUN PY 1996 VL 38 IS 6 BP 869 EP 881 DI 10.1088/0741-3335/38/6/008 PG 13 WC Physics, Fluids & Plasmas SC Physics GA UV451 UT WOS:A1996UV45100008 ER PT J AU Bonivert, WD Cushnie, G AF Bonivert, WD Cushnie, G TI More facts about the National Metal Finishing Resource Center SO PLATING AND SURFACE FINISHING LA English DT Editorial Material C1 CAI ENGN,OAKTON,VA 22124. RP Bonivert, WD (reprint author), SANDIA NATL LABS,M-S 9404,BOX 969,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD JUN PY 1996 VL 83 IS 6 BP 50 EP 52 PG 3 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA UQ555 UT WOS:A1996UQ55500017 ER PT J AU DeClue, SC AF DeClue, SC TI Minimizing hazardous waste SO POLLUTION ENGINEERING LA English DT Article RP DeClue, SC (reprint author), US DOE,SAVANNAH RIVER OPERAT OFF,AIKEN,SC 29802, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0032-3640 J9 POLLUT ENG JI Pollut. Eng. PD JUN PY 1996 VL 28 IS 6 BP 68 EP 70 PG 3 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA UP097 UT WOS:A1996UP09700028 ER PT J AU Carnes, BA Olshansky, SJ Grahn, D AF Carnes, BA Olshansky, SJ Grahn, D TI Continuing the search for a law of mortality SO POPULATION AND DEVELOPMENT REVIEW LA English DT Article ID FREE-RADICAL THEORY; DROSOPHILA-MELANOGASTER; HUMAN SENESCENCE; OLDER AGES; EVOLUTION; MODEL; PERSPECTIVES; IRRADIATION; RATES; LONGEVITY AB Scientists have long attempted to explain why closely similar age patterns of death are characteristic of highly diverse human and nonhuman populations. Historical efforts to identify a general ''law of mortality'' from these patterns that applied across species ended in 1935 when it was declared that such a law did not exist. These early efforts were conducted using mortality curves based on all causes of death. The authors predict that if comparisons of mortality are based instead on ''intrinsic'' causes of death (i.e., deaths that reflect the basic biology of the organism), then age patterns of mortality consistent with the historical concept of a law might be revealed. Using data on laboratory animals and humans, they demonstrate that age patterns of intrinsic mortality overlap when graphed on a biologically comparable time scale. These results are consistent with the existence of a law of mortality following sexual maturity, as originally asserted by Benjamin Gompertz and Raymond Pearl. The societal, medical, and research implications of such a law are discussed. C1 UNIV CHICAGO,DEPT MED,CHICAGO,IL 60637. RP Carnes, BA (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 93 TC 74 Z9 76 U1 0 U2 13 PU POPULATION COUNC PI NEW YORK PA ONE DAG HAMMARSKJOLD PLAZA, NEW YORK, NY 10017 SN 0098-7921 J9 POPUL DEV REV JI Popul. Dev. Rev. PD JUN PY 1996 VL 22 IS 2 BP 231 EP & DI 10.2307/2137434 PG 35 WC Demography; Sociology SC Demography; Sociology GA UX718 UT WOS:A1996UX71800002 ER PT J AU Bickes, RW AF Bickes, RW TI Explosive systems utilizing semiconductor bridge, SCB, technology SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article AB Sandia National Laboratories' semiconductor bridge, SCB, is a maturing technology now in use in several new applications. Those applications required explosive assemblies that were light weights small volume, low cost, and needed only small quantities of electrical energy to function. Explosive assembly here refers to the combination of the firing set (the current source for the firing signal) and the explosive component. Because conventional firing systems could not meet the new reduced size, weight and energy requirements, SCB systems were developed for applications that range from Sandia devices to commercial igniters for fireworks. Ibis paper is a brief overview of SCB technology with examples of SCB explosive systems designed to meet modem requirements. C1 Sandia Natl Labs, Explos Components Dept, Albuquerque, NM 87185 USA. RP Bickes, RW (reprint author), Sandia Natl Labs, Explos Components Dept, POB 5800, Albuquerque, NM 87185 USA. NR 14 TC 0 Z9 0 U1 1 U2 1 PU WILEY-V C H VERLAG GMBH PI BERLIN PA PO BOX 10 11 61, D-69451 BERLIN, GERMANY SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD JUN PY 1996 VL 21 IS 3 BP 146 EP 149 DI 10.1002/prep.19960210307 PG 4 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA V2977 UT WOS:000169019600006 ER PT J AU Zheng, YJ Ornstein, RL AF Zheng, YJ Ornstein, RL TI A molecular dynamics study of the effect of carbon tetrachloride on enzyme structure and dynamics: Subtilisin SO PROTEIN ENGINEERING LA English DT Article DE AMBER; non-aqueous enzymology; organic solvent; protein simulation; subtilisin Carlsberg ID FREE-ENERGY PERTURBATION; ORGANIC-SOLVENTS; CATALYZED TRANSESTERIFICATION; NONAQUEOUS SOLVENTS; ENANTIOSELECTIVITY; ENVIRONMENTS; OPTIMIZATION; BIOCATALYSIS; SIMULATIONS; SOLVATION AB Developing enzymes that are functional in highly concentrated halocarbon solutions, such as carbon tetrachloride, may prove useful in the development of new strategies for environmental remediation and monitoring of pollutant plumes, as well as in developing 'green' processes. Doing so will require gaining an understanding of the underlying structural and dynamic effects on enzymes induced by such solvents. Herein we report a 714 ps molecular dynamics simulation of the enzyme subtilisin Carlsberg and its waters of crystallization in a periodic box of carbon tetrachloride. The crystal structure from aqueous solution was used as the starting structure for our simulation using the AMBER program and forcefield. The calculated time-averaged structure is similar to the aqueous X-ray structure except for significant differences in loop (or turn) regions, resulting in many extra intra-protein hydrogen bonding interactions. Since carbon tetrachloride is a non-polar solvent and cannot interact strongly with the protein and water molecules, the water molecules stay very close to the protein surface throughout the simulation. The mobility of most of the waters was therefore very low. A few water molecules underwent significant lateral motion during the simulation, but never wandered far from the protein surface. Waters were either hydrogen bonded to protein polar groups, other water and/or counterions. Some of the surface waters participated in the formation of water-mediated hydrogen bonding networks. The increase in total number of intra-protein hydrogen bonds and the formation of water-mediated hydrogen bonding networks in carbon tetrachloride is consistent with the generally observed increase in thermostability and reduced flexibility of proteins in non-aqueous solutions, Several possible carbon tetrachloride binding sites on the protein surface are predicted. C1 PACIFIC NW LAB, ENVIRONM & MOL SCI LAB, RICHLAND, WA 99352 USA. NR 50 TC 10 Z9 11 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0269-2139 J9 PROTEIN ENG JI Protein Eng. PD JUN PY 1996 VL 9 IS 6 BP 485 EP 492 PG 8 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA UW139 UT WOS:A1996UW13900004 PM 8862548 ER PT J AU Skidmore, MO Sawaya, MR Parkin, S Rupp, B Hope, H Everse, SJ Walter, G AF Skidmore, MO Sawaya, MR Parkin, S Rupp, B Hope, H Everse, SJ Walter, G TI Crystallization of the A alpha subunit of protein phosphatase 2A SO PROTEIN SCIENCE LA English DT Article DE cryocooling; crystallization; protein phosphatase 2A; X-ray crystallography ID SERINE THREONINE PHOSPHATASES AB The A alpha subunit of human protein phosphatase 2A forms crystals in space group P2(1) with cell dimensions a = 104.0, b = 174.9, c = 168.2 Angstrom, and beta angle = 90.2 degrees. At cryogenic temperatures, the crystals diffracted to a resolution limit of similar to 3.0 Angstrom. Based on the unit cell dimensions and a calculated molecular mass of 65,277 Da, the Matthews coefficient suggests eight molecules per asymmetric unit. Two native data sets were collected to a nominal resolution of 3.0 Angstrom and merged to provide a set that is 93% complete, with R(sym) of 9.9%. C1 UNIV CALIF SAN DIEGO,DEPT PATHOL,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,DEPT CHEM BIOCHEM,LA JOLLA,CA 92093. LAWRENCE LIVERMORE NATL LAB,BBRP,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. RI Parkin, Sean/E-7044-2011 FU NCI NIH HHS [CA-36111]; NIDDK NIH HHS [5 T32 DK07233-20] NR 20 TC 1 Z9 1 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD JUN PY 1996 VL 5 IS 6 BP 1198 EP 1200 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UP617 UT WOS:A1996UP61700025 PM 8762154 ER PT J AU HACKER, BC AF HACKER, BC TI OAK-RIDGE-NATIONAL-LABORATORY - THE 1ST 50-YEARS - JOHNSON,L, SCHAFFER,D SO PUBLIC HISTORIAN LA English DT Book Review RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0272-3433 J9 PUBL HISTORIAN JI Public Hist. PD SUM PY 1996 VL 18 IS 3 BP 72 EP 73 PG 2 WC History SC History GA VJ080 UT WOS:A1996VJ08000017 ER PT J AU Zeitlin, C Miller, J Heilbronn, L Frankel, K Gong, W Schimmerling, W AF Zeitlin, C Miller, J Heilbronn, L Frankel, K Gong, W Schimmerling, W TI The fragmentation of 510 MeV/nucleon iron-56 in polyethylene .1. Fragment fluence spectra SO RADIATION RESEARCH LA English DT Article ID 670A MEV NE-20; CASCADE-EVAPORATION MODEL; HEAVY CHARGED-PARTICLES; CROSS-SECTIONS; PHOTOEMULSION NUCLEI; TRANSPORT-THEORY; FE-56 NUCLEI; COLLISIONS; DEPTH; WATER AB The fragmentation of 510 MeV/nucleon iron ions in several thicknesses of polyethylene has been measured. Non-interacting primary beam particles and fragments have been identified and their LETs calculated by measuring ionization energy loss in a stack of silicon detectors. Fluences, normalized to the incident beam intensity and corrected for detector effects, are presented for each fragment charge and target. Histograms of fluence as a function of LET are also presented. Some implications of these data for measurements of the biological effects of heavy ions are discussed. (C) 1996 by Radiation Research Society C1 UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. RP Zeitlin, C (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Heilbronn, Lawrence/J-6998-2013 OI Heilbronn, Lawrence/0000-0002-8226-1057 NR 30 TC 26 Z9 27 U1 0 U2 2 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1996 VL 145 IS 6 BP 655 EP 665 DI 10.2307/3579355 PG 11 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA UM958 UT WOS:A1996UM95800001 PM 8643824 ER PT J AU Zeitlin, C Heilbronn, L Miller, J Schimmerling, W Townsend, LW Tripathi, RK Wilson, JW AF Zeitlin, C Heilbronn, L Miller, J Schimmerling, W Townsend, LW Tripathi, RK Wilson, JW TI The fragmentation of 510 MeV/nucleon iron-56 in polyethylene .2. Comparisons between data and a model SO RADIATION RESEARCH LA English DT Article ID 670A MEV NE-20; TRANSPORT-THEORY; DEPTH; WATER AB The results of a Monte Carlo model for calculating fragment fluences and LET spectra are compared to data taken with 600 MeV/nucleon iron ions incident on an accelerator beamline configured for irradiation of biological samples, with no target and with 2, 5 and 8 cm of polyethylene. The model uses a multi-generation nuclear fragmentation code, coupled with a formulation of ionization energy loss based on the Bethe-Bloch equation. In the region where the data are reliable and the experimental acceptance is well understood, many of the features of the experimental spectra are well replicated by the model. To obtain good agreement with the experimental data, the model must allow for at least two generations of fragment production in the target. (C) 1996 by Radiation Research Society C1 UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP Zeitlin, C (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Heilbronn, Lawrence/J-6998-2013 OI Heilbronn, Lawrence/0000-0002-8226-1057 NR 11 TC 22 Z9 22 U1 0 U2 2 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1996 VL 145 IS 6 BP 666 EP 672 DI 10.2307/3579356 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA UM958 UT WOS:A1996UM95800002 PM 8643825 ER PT J AU Lipton, MSW Fuciarelli, AF Springer, DL Edmonds, CG AF Lipton, MSW Fuciarelli, AF Springer, DL Edmonds, CG TI Characterization of radiation-induced thymine-tyrosine crosslinks by electrospray ionization mass spectrometry SO RADIATION RESEARCH LA English DT Article ID DNA-PROTEIN CROSSLINKS; LINK INVOLVING THYMINE; IONIZING-RADIATION; PHOTOCHEMICAL ADDITION; INDUCED DAMAGE; AMINO-ACIDS; NUCLEOHISTONE; CHROMATIN; PEPTIDES; CELLS AB Exposure to ionizing radiation leads to formation of covalent crosslinks between DNA and proteins. The nature, extent and site of the modifications are not well understood due to the difficulty in assessing free radical-induced damage in biopolymers. Electrospray ionization mass spectrometry (ESI-MS) permits direct analyses of intact oligopeptides, permitting characterization of the radiation-induced DNA-protein covalently crosslinked constituents. Our first application of this methodology to free radical-induced damage was in a model system where angiotensin, a small 10-amino acid peptide, is irradiated at various doses in the presence of excess thymine. The relative yield of crosslinks, which ranged from 0.1 to 15%, was linearly related to radiation dose for doses from 0.1 to 100 Gy. Detection of thymine-tyrosine moieties in this model system was possible at doses as low as 0.1 Gy with a signal-to-noise ratio of 4 to 1. ESI-MS revealed that the site of crosslink was located exclusively on the tyrosine residue as expected. (C) 1996 by Radiation Research Society C1 PACIFIC NW NATL LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. PACIFIC NW NATL LAB, MOL BIOSCI DEPT, RICHLAND, WA 99352 USA. NR 37 TC 14 Z9 14 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1996 VL 145 IS 6 BP 681 EP 686 DI 10.2307/3579358 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA UM958 UT WOS:A1996UM95800004 ER PT J AU Morris, GM Coderre, JA Hopewell, JW Micca, PL Fisher, C AF Morris, GM Coderre, JA Hopewell, JW Micca, PL Fisher, C TI Boron neutron capture irradiation of the rat spinal cord: Effects of variable doses of borocaptate sodium SO RADIOTHERAPY AND ONCOLOGY LA English DT Article DE boron neutron capture irradiation; borocaptate sodium; Fischer 344 rat; spinal cord model; CNS ID CHINESE-HAMSTER CELLS; X-RAYS; THERAPY; SINGLE; DAMAGE; TOLERANCE AB The Fischer 344 rat spinal cord model has been used to evaluate the response of the central nervous system to boron neutron capture irradiation with variable doses of the neutron capture agent, borocaptate sodium (BSH). Three doses of BSH, 190, 140 and 80 mg/kg body weight, administered by i.p. injection, were used to establish the time course of B-10 accumulation in and removal from the blood. After administration of the two lower doses of BSH, blood B-10 levels peaked at 0.5 h after injection, with no significant (P > 0.1) change at 1 h after injection. Beyond this time point, levels of B-10 in the blood began to decrease after a dose of 80 mg/kg BSH, but remained constant until 3 h after administration after the two higher doses of BSH. Myelopathy developed after latent intervals of 20.4 +/- 0.1, 20.8 +/- 1.4, 15.0 +/- 0.8, 15.4 +/- 0.4 and 15.6 +/- 0.4 weeks, following irradiation with thermal neutrons in combination with BSH at doses of 20, 40, 80, 140 and 190 mg/kg body weight, respectively. The radiation-induced lesion in the spinal cord was white matter necrosis. ED(50) values for myelopathy were calculated from probit-fitted dose-effect curves. Expressed as total physical absorbed doses, these values were 20.7 +/- 1.9, 24.9 +/- 1.2, 27.2 +/- 0.9, 28.4 +/- 0.6 and 32.4 +/- 1.9 Gy after irradiation with thermal neutrons in the presence of 20, 40, 80, 140 and 190 mg/kg body weight of BSH, respectively. The compound biological effectiveness (CBE) factor values, estimated from this data, were in the range 0.49-0.55. There was no significant (P > 0.1) variation in the CBE factor for BSH as a function of increasing B-10 concentration in the blood. It was concluded that there was no significant synergistic interaction between the low and high linear energy transfer (LET) components of the boron neutron capture (BNC) radiation field. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RP Morris, GM (reprint author), UNIV OXFORD,CHURCHILL HOSP,RES INST,CRC NORMAL TISSUE RADIOBIOL RES GRP,S PARKS RD,OXFORD OX3 7LJ,ENGLAND. NR 27 TC 21 Z9 22 U1 0 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0167-8140 J9 RADIOTHER ONCOL JI Radiother. Oncol. PD JUN PY 1996 VL 39 IS 3 BP 253 EP 259 DI 10.1016/0167-8140(95)01693-7 PG 7 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA UP292 UT WOS:A1996UP29200007 PM 8783402 ER PT J AU Freedman, DA Gold, LS Lin, TH AF Freedman, DA Gold, LS Lin, TH TI Concordance between rats and mice in bioassays for carcinogenesis SO REGULATORY TOXICOLOGY AND PHARMACOLOGY LA English DT Article ID NATIONAL-TOXICOLOGY-PROGRAM; POTENCY DATABASE; ANIMAL BIOASSAYS; RISK ASSESSMENT; LONG-TERM; CHRONOLOGICAL SUPPLEMENT; MODELS; EXTRAPOLATION; CHEMICALS AB According to current policy, chemicals are evaluated for possible cancer risk to humans at low dose by testing in bioassays in which high doses of the chemical are given to rodents. Thus, risk: is extrapolated from high dose in rodents to low dose in humans. The accuracy of these extrapolations is generally unverifiable because data on humans are limited However, it is feasible to examine the accuracy of extrapolations from mice to rats. If mice and rats are similar with respect to carcinogenesis, this provides some evidence in favor of interspecies extrapolations; conversely, if mice and rats are different, this casts doubt on the validity of extrapolations from mice to humans. One measure of interspecies agreement is concordance, the percentage of chemicals that are classified the same way as to carcinogenicity in mice and rats. Observed concordance in National Cancer Institute/National Toxicology Program bioassays is about 75%, which may seem on the low side because mice and rats are closely related species tested under the same experimental conditions. However, observed concordance could underestimate true concordance due to measurement error in the bioassays-a possibility demonstrated by Piegorsch ct al. (Risk Anal. 12, 115-121, 1992). Expanding on this work, we show that the bias in observed concordance can be either positive or negative: an observed concordance of 75% can arise if the true concordance is anything between 20 and 100%. In particular, observed concordance can seriously overestimate-true concordance. (C) 1996 Academic Press, Inc. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV BIOCHEM & MOL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP Freedman, DA (reprint author), UNIV CALIF BERKELEY,DEPT STAT,BERKELEY,CA 94720, USA. FU NIEHS NIH HHS [ES01896] NR 35 TC 12 Z9 12 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0273-2300 J9 REGUL TOXICOL PHARM JI Regul. Toxicol. Pharmacol. PD JUN PY 1996 VL 23 IS 3 BP 225 EP 232 DI 10.1006/rtph.1996.0046 PG 8 WC Medicine, Legal; Pharmacology & Pharmacy; Toxicology SC Legal Medicine; Pharmacology & Pharmacy; Toxicology GA VE420 UT WOS:A1996VE42000007 PM 8812964 ER PT J AU Aldemir, T Siu, N AF Aldemir, T Siu, N TI Reliability and safety analysis of dynamic process systems - Guest editorial SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Editorial Material ID PROBABILISTIC REACTOR DYNAMICS; EVENT TREES C1 IDAHO NATL ENGN LAB,CTR RELIABIL & RISK ASSESSMENT,IDAHO FALLS,ID 83415. RP Aldemir, T (reprint author), OHIO STATE UNIV,NUCL ENGN PROGRAM,COLUMBUS,OH 43210, USA. NR 10 TC 4 Z9 6 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PD JUN PY 1996 VL 52 IS 3 BP 181 EP 183 DI 10.1016/S0951-8320(96)90014-9 PG 3 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA UW142 UT WOS:A1996UW14200001 ER PT J AU Gertman, DI Haney, LN Siu, NO AF Gertman, DI Haney, LN Siu, NO TI Representing context, cognition, and crew performance in a shutdown risk assessment SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB This paper presents a potentially practical treatment of dynamic operator-system interactions. The approach employs a dynamic event tree framework to explicitly address plant dynamics, system indications, crew-plant interactions, time available, crew cognition, errors of commission (mistakes), and multiple planning and diagnosis possibilities. The approach is applied in an analysis of a hypothesized medium break loss of coolant accident for a test reactor that occurs during plant shutdown. This transient was selected on the basis of: a significant cognitive component being present, high consequences being associated with operator actions, and the importance of event timing to scenario progression. The results presented show how quantitative risk predictions are affected by the treatment of dynamics, and demonstrate how non-proceduralized recovery actions and a number of performance shaping factors (e.g., crew experience, stress, and confidence) can be explicitly treated. Insights and lessons learned regarding the performance of a dynamic assessment are also presented. (C) 1996 Elsevier Science Limited. C1 IDAHO NATL ENGN LAB,ENGN ANAL DEPT,IDAHO FALLS,ID 83415. JASON ASSOC CORP,WESTMINSTER,CO 80030. NR 17 TC 6 Z9 7 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PD JUN PY 1996 VL 52 IS 3 BP 261 EP 278 DI 10.1016/0951-8320(95)00138-7 PG 18 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA UW142 UT WOS:A1996UW14200007 ER PT J AU Wolf, E James, DFV AF Wolf, E James, DFV TI Correlation-induced spectral changes SO REPORTS ON PROGRESS IN PHYSICS LA English DT Review ID PARTIALLY COHERENT SOURCES; SPACE-FREQUENCY DOMAIN; YOUNG INTERFERENCE EXPERIMENT; SPONTANEOUS EMISSION; ENERGY-CONSERVATION; SPHERICAL-SYMMETRY; TIME FLUCTUATIONS; PLANAR SOURCES; RANDOM-MEDIA; SHIFTS AB This paper presents a review of research, both theoretical and experimental, concerning the influence of coherence properties of fluctuating light sources and of correlation properties of scattering media on the spectra of radiated and scattered fields. Much of this research followed a discovery made in 1986, that the spectrum of light may change on propagation, even in free space. More than 100 papers on this topic have been published to date and many of them are reviewed, or at least mentioned, in this article. After an introduction and a summary of some of the main mathematical results relating to second-order coherence theory of statistically stationary optical fields, spectral changes that may take place on superposing fields produced by two partially correlated sources are discussed. Spectral effects in fields produced by two-dimensional secondary sources and by three-dimensional primary sources are then considered. The section which follows describes spectral changes that may arise when polychromatic light is scattered on media whose physical properties vary randomly either in space and/or in time. A review is also presented of recent research, which has revealed that under certain circumstances the changes in the spectrum of light scattered on random media may imitate the Doppler effect, even though the source, the medium and the observer are all at rest with respect to one another. In the final section a brief review is given of a new emerging technique sometimes called spatial-coherence spectroscopy. It is based on the discovery that it is possible, under certain circumstances, to determine field correlations from spectral measurements. C1 LOS ALAMOS NATL LAB,DIV THEORET T4,LOS ALAMOS,NM 87545. UNIV ROCHESTER,ROCHESTER THEORY CTR OPT SCI & ENGN,ROCHESTER,NY 14627. RP Wolf, E (reprint author), UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627, USA. RI James, Daniel/B-9805-2009 OI James, Daniel/0000-0003-3981-4602 NR 148 TC 166 Z9 172 U1 2 U2 15 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0034-4885 J9 REP PROG PHYS JI Rep. Prog. Phys. PD JUN PY 1996 VL 59 IS 6 BP 771 EP 818 DI 10.1088/0034-4885/59/6/002 PG 48 WC Physics, Multidisciplinary SC Physics GA UT788 UT WOS:A1996UT78800002 ER PT J AU deBruyn, JR Bodenschatz, E Morris, SW Trainoff, SP Hu, YC Cannell, DS Ahlers, G AF deBruyn, JR Bodenschatz, E Morris, SW Trainoff, SP Hu, YC Cannell, DS Ahlers, G TI Apparatus for the study of Rayleigh-Benard convection in gases under pressure SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Review ID LOW PRANDTL NUMBER; SPIRAL DEFECT CHAOS; WAVE-VECTOR FIELD; THERMAL-CONVECTION; PATTERN-FORMATION; CYLINDRICAL CONTAINER; TURBULENT CONVECTION; CARBON-DIOXIDE; LOW-TEMPERATURE; PHASE DYNAMICS AB We review the history of experimental work on Rayleigh-Benard convection in gases, and then describe a modern apparatus that has been used in our experiments on gas convection. This system allows for the study of patterns in a cell with an aspect ratio (cell radius/fluid layer depth) as large as 100, with the cell thickness uniform to a fraction of a mu m, and with the pressure controlled at the level of one part in 10(5). This level of control can yield a stability of the critical temperature difference for the convective onset of better than one part in 10(4). The convection patterns are visualized and the temperature field can be inferred using the shadowgraph technique. We describe the flow visualization and image processing necessary for this. Some interesting results obtained with the system are briefly summarized. (C) 1996 American Institute of Physics. C1 CORNELL UNIV, DEPT PHYS, ITHACA, NY 14853 USA. CORNELL UNIV, ATOM & SOLID STATE PHYS LAB, ITHACA, NY 14853 USA. UNIV TORONTO, DEPT PHYS, TORONTO, ON M5S 1A7, CANADA. UNIV TORONTO, ERINDALE COLL, TORONTO, ON M5S 1A7, CANADA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV CALIF SANTA BARBARA, CTR NONLINEAR SCI, SANTA BARBARA, CA 93106 USA. LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. LOS ALAMOS NATL LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. RP deBruyn, JR (reprint author), MEM UNIV NEWFOUNDLAND, DEPT PHYS, ST JOHNS, NF A1B 3X7, CANADA. RI Bodenschatz, Eberhard/C-6603-2009; Morris, Stephen/F-6778-2013 OI Bodenschatz, Eberhard/0000-0002-2901-0144; NR 190 TC 95 Z9 95 U1 1 U2 10 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1996 VL 67 IS 6 BP 2043 EP 2067 DI 10.1063/1.1147511 PG 25 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA UR222 UT WOS:A1996UR22200001 ER PT J AU Miller, D QuinbyHunt, MS Hunt, AJ AF Miller, D QuinbyHunt, MS Hunt, AJ TI Novel bistatic polarization nephelometer for probing scattering through a planar interface SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID LIGHT-SCATTERING; OCEAN AB We have developed a novel bistatic polarization-modulated nephelometer that probes a medium enabling in situ measurement of angle- and polarization-dependent light scattering through a planar interface. This is particularly important for media with a planar interface such as sea ice but also for media in which measurements at great distance or depth, e.g., the atmosphere, are desirable. The instrument sits directly and noninvasively on the planar surface of the scattering medium. Light from a laser beam is directed into the medium and the scattered light is detected by analyzer optics. The angle of both the laser and detector beams in the medium can be varied continuously. Alternating current polarimetry is used to obtain phase function and polarization information of the scattered light. Measurements from this instrument of scattering from monodisperse polystyrene (latex) spheres in the laboratory are in good qualitative agreement with the results of Mie calculations and measurements made with a conventional monostatic nephelometer. This instrument has also been used to make preliminary investigations of scattering in sea ice in Pt. Barrow, Alaska. (C) 1996 American Institute of Physics. RP Miller, D (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 16 TC 7 Z9 7 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1996 VL 67 IS 6 BP 2089 EP 2095 DI 10.1063/1.1147020 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA UR222 UT WOS:A1996UR22200006 ER PT J AU Tuszewski, M AF Tuszewski, M TI A compact mass spectrometer for plasma discharge ion analysis SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A simple, compact, and inexpensive mass spectrometer for ion species analysis in plasma processing experiments has been successfully operated. The above attractive attributes are made possible by a single-step mass analysis rather than the usual two-step process of ion extraction followed by mass filtering. Theory and data show that the single-step process can be used without compromising the accuracy of ion species concentrations for sufficiently low applied voltages and large front aperture separations. The instrument is small enough to be introduced in most plasma discharges for in situ rather than for edge studies. The mass spectrometer has a moderate resolution that is adequate for many applications. The instrument can be afforded by all researchers, can be easily built, and can be operated in steady-state or pulsed plasma discharges. (C) 1996 American Institute of Physics. RP Tuszewski, M (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 11 TC 14 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1996 VL 67 IS 6 BP 2215 EP 2220 DI 10.1063/1.1147039 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA UR222 UT WOS:A1996UR22200028 ER PT J AU Elston, RA AF Elston, RA TI International trade in live molluscs: Perspective from the Americas SO REVUE SCIENTIFIQUE ET TECHNIQUE DE L OFFICE INTERNATIONAL DES EPIZOOTIES LA English DT Article DE Americas; disease control; health; international trade; molluscs AB There is an active world trade in seed and edible molluscs, including such species as oysters, abalones, clams, scallops and mussels. The supply of new and efficiently-produced products, such as triploid oyster seed, is likely to increase due to greater world-wide demand for these high-value products, together with improved technology. Transfer of live molluscs is driven by need and availability, with concern over infectious disease risks often playing a subordinate role or sewing to support economic trade barriers. Experience shows that serious risks from infectious disease transfer exist. Technology and balanced management, however, can limit such risks. Separation of biological risks from trade control objectives is a necessary first step. A systematic method of risk analysis is urgently needed along with predefined actions which can be adapted to the various risk levels. Critical to the effective development and implementation of this risk analysis is the participation of the shellfish industry in defining risks and actions. Organization and infrastructure to improve recognition of infectious diseases and decrease response time are necessary improvements, together with appropriately-targeted research on impacts, diagnosis, epidemiology, carrier status, and the geographical distribution of diseases. RP Elston, RA (reprint author), BATTELLE MARINE SCI LAB,1529 W SEQUIM BAY RD,SEQUIM,WA 98382, USA. NR 5 TC 3 Z9 3 U1 0 U2 2 PU OFFICE INT EPIZOOTIES PI PARIS PA 12 RUE DE PRONY, 75017 PARIS, FRANCE SN 0253-1933 J9 REV SCI TECH OIE JI Rev. Sci. Tech. Off. Int. Epizoot. PD JUN PY 1996 VL 15 IS 2 BP 483 EP 490 PG 8 WC Veterinary Sciences SC Veterinary Sciences GA VL602 UT WOS:A1996VL60200008 PM 8890376 ER PT J AU Kocher, DC Hoffman, FO AF Kocher, DC Hoffman, FO TI An approach for balancing health and ecological risks at hazardous waste sites - Comment SO RISK ANALYSIS LA English DT Letter C1 SENES OAK RIDGE INC,CTR RISK ANAL,OAK RIDGE,TN 37830. RP Kocher, DC (reprint author), OAK RIDGE NATL LAB,HLTH SCI RES DIV,1060 COMMERCE PK DR,OAK RIDGE,TN 37830, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1996 VL 16 IS 3 BP 295 EP 297 DI 10.1111/j.1539-6924.1996.tb01460.x PG 3 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA UT121 UT WOS:A1996UT12100002 PM 8693155 ER PT J AU Suter, GW AF Suter, GW TI An approach for balancing health and ecological risks at hazardous waste sites - Reply SO RISK ANALYSIS LA English DT Letter RP Suter, GW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1996 VL 16 IS 3 BP 299 EP 299 DI 10.1111/j.1539-6924.1996.tb01461.x PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA UT121 UT WOS:A1996UT12100003 ER PT J AU McKone, TE Daniels, JI Goldman, M AF McKone, TE Daniels, JI Goldman, M TI Uncertainties in the link between global climate change and predicted health risks from pollution: Hexachlorobenzene (HCB) case study using a fugacity model SO RISK ANALYSIS LA English DT Article DE climate change; uncertainty; sensitivity; fugacity models; health risk ID ORGANIC-CHEMICALS; POLLUTANTS AB Industrial societies have altered the earth's environment in ways that could have important, longterm ecological, economic, and health implications. In this paper, we examine the extent to which uncertainty about global climate change could impact the precision of predictions of secondary outcomes such as health impacts of pollution. Using a model that links global climate change with predictions of chemical exposure and human health risk in the Western region of the United States of America (U.S.), we define parameter variabilities and uncertainties and we characterize the resulting outcome variance. As a case study, we consider the public health consequences from releases of hexachlorobenzene (HCB), a ubiquitous multimedia pollutant. By constructing a matrix that links global environmental change both directly and indirectly to potential human-health effects attributable to HCB released into air, soil, and water, we define critical parameter variances in the health risk estimation process. We employ a combined uncertainty/sensitivity analysis to investigate how HCB releases are affected by increasing atmospheric temperature and the accompanying climate alterations that are anticipated. We examine how such uncertainty impacts both the expected magnitude and calculational precision of potential human exposures and health effects. This assessment reveals that uncertain temperature increases of up to 5 degrees C have little impact on either the magnitude or precision of the public-health consequences estimated under existing climate variations for HCB released into air and water in the Western region of the U.S. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP McKone, TE (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720, USA. NR 39 TC 22 Z9 22 U1 1 U2 9 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1996 VL 16 IS 3 BP 377 EP 393 DI 10.1111/j.1539-6924.1996.tb01472.x PG 17 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA UT121 UT WOS:A1996UT12100014 PM 8693163 ER PT J AU Baldwin, E AF Baldwin, E TI Ecology, justice, and Christian faith: A critical guide to the literature - Bakken,PW, Engel,JG, Engel,JR SO RISK ANALYSIS LA English DT Book Review C1 OAK RIDGE NATL LAB,HLTH SCI RES DIV,OAK RIDGE,TN 37831. RP Baldwin, E (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1996 VL 16 IS 3 BP 439 EP 439 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA UT121 UT WOS:A1996UT12100020 ER PT J AU Morris, J AF Morris, J TI Applied contaminant transport modeling: Theory and practice - Zheng,CM, Bennett,GD SO RISK ANALYSIS LA English DT Book Review C1 OAK RIDGE NATL LAB,HLTH SCI RES DIV,OAK RIDGE,TN 37831. RP Morris, J (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 1 TC 0 Z9 0 U1 2 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1996 VL 16 IS 3 BP 439 EP 439 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA UT121 UT WOS:A1996UT12100021 ER PT J AU Gschneidner, KA Pecharsky, VK Cho, J Martin, SW AF Gschneidner, KA Pecharsky, VK Cho, J Martin, SW TI The beta to gamma transformation in cerium - A twenty year study SO SCRIPTA MATERIALIA LA English DT Article C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP Gschneidner, KA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 11 TC 16 Z9 16 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD JUN 1 PY 1996 VL 34 IS 11 BP 1717 EP 1722 DI 10.1016/1359-6462(96)00035-8 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA UH960 UT WOS:A1996UH96000011 ER PT J AU Pazo, A Santos, C Guitian, F Tomsia, AP Moya, JS AF Pazo, A Santos, C Guitian, F Tomsia, AP Moya, JS TI HA-bioactive glass composites: High temperature reactivity and ''in vitro'' behavior SO SCRIPTA MATERIALIA LA English DT Article C1 LAWRENCE BERKELEY LAB,BERKELEY,CA. CSIC,INST CIENCIA MAT,E-28006 MADRID,SPAIN. RP Pazo, A (reprint author), UNIV SANTIAGO,INST CERAM,E-15706 SANTIAGO,SPAIN. RI Moya, Jose/I-5841-2013 NR 9 TC 10 Z9 10 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD JUN 1 PY 1996 VL 34 IS 11 BP 1729 EP 1733 DI 10.1016/1359-6462(96)00048-6 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA UH960 UT WOS:A1996UH96000013 ER PT J AU Fernandez, AM Sebastian, PJ Bhattacharya, RN Noufi, R Contreras, M Hermanns, AM AF Fernandez, AM Sebastian, PJ Bhattacharya, RN Noufi, R Contreras, M Hermanns, AM TI An 8% CuInSe2-based solar cell formed from an electrodeposited precursor film SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article AB An 8% CuInSe2 (CIS) based solar cell was developed using an electrodeposited CIS precursor film subjected to post-deposition heat treatment at 550 degrees C in Se and In atmospheres. The cell structure consisted of Mo/CIS/CdS/i-ZnO/ZnO/MgF2/Al-Ni. The cell parameters such as J(sc) = 32.1 mA cm(-2) V-oc = 394 mV, FF = 62.3% and eta = 7.9% were determined from I-V characterization of the annealed cell at a light intensity of 1000 W m(-2). The cell parameters improved after annealing in air at 200 degrees C. A carrier density of 6.3 x 10(17) cm(-3) was obtained from the C-V characterization of the cell. C1 NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. RP Fernandez, AM (reprint author), Univ Nacl Autonoma Mexico, IIM, LAB ENERGIA SOLAR, TEMIXCO 62580, MORELOS, MEXICO. NR 10 TC 18 Z9 18 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JUN PY 1996 VL 11 IS 6 BP 964 EP 967 DI 10.1088/0268-1242/11/6/020 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA UQ284 UT WOS:A1996UQ28400020 ER PT J AU Lee, AP Ciarlo, DR Krulevitch, PA Lehew, S Trevino, J Northrup, MA AF Lee, AP Ciarlo, DR Krulevitch, PA Lehew, S Trevino, J Northrup, MA TI A practical microgripper by fine alignment, eutectic bonding and SMA actuation SO SENSORS AND ACTUATORS A-PHYSICAL LA English DT Article; Proceedings Paper CT 8th International Conference on Solid-State Sensors and Actuators (Eurosensors IX) CY JUN 25-29, 1995 CL STOCKHOLM, SWEDEN DE microgrippers; silicon; shape memory alloys; selective eutectic bonding; remote gripping AB A microgripper with a large gripping force, a relatively rigid structural body, and flexibility in functional design is presented. The actuation is generated by Ni-Ti-Cu shape memory alloy (SMA) films and the stress induced can deflect each side of the microgripper up to 55 mu m for a total gripping motion of 110 mu m. When fully open, the force exerted by the film corresponds to a 13 mN gripping force on the tip of the gripper. RP Lee, AP (reprint author), LAWRENCE LIVERMORE NATL LAB,MICROTECHNOL CTR,POB 808,L-222,LIVERMORE,CA 94551, USA. NR 12 TC 70 Z9 73 U1 0 U2 10 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0924-4247 J9 SENSOR ACTUAT A-PHYS JI Sens. Actuator A-Phys. PD JUN PY 1996 VL 54 IS 1-3 BP 755 EP 759 DI 10.1016/S0924-4247(97)80052-0 PG 5 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA VV392 UT WOS:A1996VV39200059 ER PT J AU Sadana, A Alarie, JP VoDinh, T AF Sadana, A Alarie, JP VoDinh, T TI Antigen-antibody diffusion-limited binding kinetics for biosensors: A fractal analysis SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE antigen-antibody kinetics; binding rate coefficients; fractal dimension; biosensors ID IMMOBILIZED ANTIBODY; RATE COEFFICIENT; SURFACES; SENSORS AB A fractal analysis is presented for the binding of benzopyrene-tetraol (BPT) in solution to anti-BPT attached to diol silica beads in a fiberoptic antibody-based biosensor. The binding rate coefficient, k(1), and the fractal dimension, D-f, both increase as the BPT concentration in solution increases from 3 x 10(-9) to 1.59 x 10(-8) M. Predictive relations for k(1) (Sets 1 and 2) and for D-f, (Set 2 only) as a function of BPT concentration are provided. These relations fit the calculated k(1) and D-f values in the BPT concentration range reasonably well. Fractal analysis data seem to indicate that an increase in the BPT concentration in solution increases the 'roughness' or the state of disorder on the fiber-optic biosensor surface. Fractal analysis data provide novel physical insights into the reactions occurring on the fiber-optic biosensor surface and should assist in the design of fiber-optic biosensors. C1 OAK RIDGE NATL LAB,HLTH SCI RES DIV,OAK RIDGE,TN 37831. UNIV MISSISSIPPI,DEPT CHEM ENGN,UNIVERSITY,MS 38677. NR 30 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD JUN PY 1996 VL 32 IS 3 BP 195 EP 201 DI 10.1016/S0925-4005(97)80029-9 PG 7 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA WA309 UT WOS:A1996WA30900006 ER PT J AU Tonn, BE AF Tonn, BE TI Summary of CSS'95 SO SOCIAL SCIENCE COMPUTER REVIEW LA English DT Editorial Material RP Tonn, BE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SAGE SCIENCE PRESS PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0894-4393 J9 SOC SCI COMPUT REV JI Soc. Sci. Comput. Rev. PD SUM PY 1996 VL 14 IS 2 BP 187 EP 189 DI 10.1177/089443939601400206 PG 3 WC Computer Science, Interdisciplinary Applications; Information Science & Library Science; Social Sciences, Interdisciplinary SC Computer Science; Information Science & Library Science; Social Sciences - Other Topics GA VW108 UT WOS:A1996VW10800006 ER PT J AU Hubbell, JM Sisson, JB AF Hubbell, JM Sisson, JB TI Portable tensiometer use in deep boreholes SO SOIL SCIENCE LA English DT Article AB Quantifying the direction and rate of soil water movement beneath landfill disposal areas requires tensiometers capable of monitoring soil water potentials from one to several hundred meters below land surface. This paper describes a new way to use tensiometers to measure soil water potentials at nearly any depth, Two portable tensiometers were constructed and tested in the field. One portable tensiometer was sealed with a septum stopper, lowered to the bottom of a borehole, allowed to equilibrate, and retrieved to land surface, The soil water potentials were then determined through the septum stopper using a pressure transducer equipped with a hypodermic needle. A second portable tensiometer was constructed with an electronic pressure transducer with leads brought to land surface to allow continuous monitoring of soil water potentials without removing the tensiometer from the borehole for extended time periods, The portable tensiometers are retrieved to land surface periodically to refill with de-aired water, Both portable tensiometers were operated in the field with little maintenance for periods exceeding 2 months at depths of 4 to 6 meters. The response time of the portable tensiometers ranged from a few hours to several days and was limited by the contact between the porous cup and the soil,The slow response time was not found to be a serious problem in deep boreholes, The nearly constant temperature conditions found in deep boreholes were found to contribute to stable, long-term tension values and to reducing maintenance normally required by standard tensiometers. RP Hubbell, JM (reprint author), IDAHO NATL ENGN LAB,LOCKHEED MARTIN IDAHO TECHNOL,POB 1625,MS 2107,IDAHO FALLS,ID 83415, USA. NR 19 TC 10 Z9 10 U1 0 U2 3 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0038-075X J9 SOIL SCI JI Soil Sci. PD JUN PY 1996 VL 161 IS 6 BP 376 EP 381 DI 10.1097/00010694-199606000-00004 PG 6 WC Soil Science SC Agriculture GA UR232 UT WOS:A1996UR23200004 ER PT J AU Czanderna, AW Ciszek, T Schock, HW Hamakawa, Y Luque, A AF Czanderna, AW Ciszek, T Schock, HW Hamakawa, Y Luque, A TI Special double volume: First World Conference on Photovoltaic Energy conversion (WCPEC) - Preface SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Editorial Material C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. UNIV STUTTGART,INST PHYS ELEKTR,D-70569 STUTTGART,GERMANY. OSAKA UNIV,FAC ENGN SCI,OSAKA 560,JAPAN. UNIV POLITECN MADRID,INST ENERGIA SOLAR,E-28040 MADRID,SPAIN. NR 0 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 1 EP 2 DI 10.1016/0927-0248(96)00008-6 PG 2 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200001 ER PT J AU Wang, TH Ciszek, TF Schwerdtfeger, CR Moutinho, H Matson, R AF Wang, TH Ciszek, TF Schwerdtfeger, CR Moutinho, H Matson, R TI Growth of silicon thin layers on cast MG-Si from metal solutions for solar cells SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB In pursuit of device-quality layer formation on cast, metallurgical-grade silicon (MG-Si) substrates for solar cells, the growth kinetics of silicon liquid phase epitaxy (LPE) from metal solutions was studied. We found an ideal solvent system, Cu-Al, for growth of Si layers with thicknesses of tens of microns on cast MG-Si substrates by LPE at temperatures near 900 degrees C. This solvent system utilizes Al to ensure good wetting between the solution and substrate by removing silicon native oxides, and employs Cu to control Al doping into the layers. Isotropic growth is achieved because of a high concentration of solute silicon in the solution and the resulting microscopically rough interface. As a result, macroscopically smooth Si layers have been grown on cast MG-Si that are suitable for device fabrication. With the microscopically rough interface, the growth rate has been studied with a diffusional model involving a boundary layer that takes the melt convection into account. The model was found to be in good agreement with experimental results, indicating only a small boundary layer (similar to 0.1 cm) and a silicon diffusivity of similar to 2 x 10(-4) cm(2) s(-1) in the liquid. The thin layer (similar to 30 mu m) grown on the MG-Si substrate has a minority-carrier diffusion length greater than the layer thickness. RP Wang, TH (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 7 TC 29 Z9 29 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 19 EP 30 DI 10.1016/0927-0248(95)00131-X PG 12 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200003 ER PT J AU Doshi, P Rohatgi, A Ropp, M Chen, Z Ruby, D Meier, DL AF Doshi, P Rohatgi, A Ropp, M Chen, Z Ruby, D Meier, DL TI Rapid thermal processing of high-efficiency silicon solar cells with controlled in-situ annealing SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID PHOSPHORUS; DIFFUSION AB Silicon solar cell efficiencies of 17.1%, 16.4%, 14.8%, and 14.9% have been achieved on FZ, Cz, multicrystalline (mc-Si), and dendritic web (DW) silicon, respectively, using simplified, cost-effective rapid thermal processing (RTP). These represent the highest reported efficiencies for solar cells processed with simultaneous front and back diffusion with no conventional high-temperature furnace steps. Appropriate diffusion temperature coupled with the added in-situ anneal resulted in suitable minority-carrier lifetime and diffusion profiles for high-efficiency cells. The cooling rate associated with the in-situ anneal can improve the lifetime and lower the reverse saturation current density (J(o)), however, this effect is material and base resistivity specific. PECVD antireflection (AR) coatings provided low reflectance and efficient front surface and bulk defect passivation. Conventional cells fabricated on FZ silicon by furnace diffusions and oxidations gave an efficiency of 18.8% due to greater short wavelength response and lower J(o). C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. EBARA SOLAR INC,LARGE,PA 15025. RP Doshi, P (reprint author), GEORGIA INST TECHNOL,UNIV CTR EXCELLENCE PHOTOVOLTAICS RES & EDUC,ATLANTA,GA 30332, USA. NR 17 TC 10 Z9 11 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 31 EP 39 DI 10.1016/0927-0248(95)00119-0 PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200004 ER PT J AU Tsuo, YS Pitts, JR Landry, MD Menna, P Bingham, CE Lewandowski, A Ciszek, TF AF Tsuo, YS Pitts, JR Landry, MD Menna, P Bingham, CE Lewandowski, A Ciszek, TF TI High-flux solar furnace processing of silicon solar cells SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID EXCIMER LASER; FILM; CRYSTALLIZATION; TEMPERATURE; SUBSTRATE AB We used a 10-kW, high-flux solar furnace (HFSF) to diffuse the front-surface n(+)-p junction and the back-surface p-p(+) junction of single-crystal silicon solar cells in one processing step. We found that all of these HFSF-processed cells have better conversion efficiencies than control cells of identical structures fabricated by conventional furnace diffusion methods. We also used the HFSF to crystallize a-Si:H thin films on glass, to texture crystalline silicon surfaces, to deposit gold contacts on silicon wafers, and to getter impurities from metallurgical grade silicon. HFSF processing offers several advantages over conventional furnace processing: (1) it provides a cold-wall process, which reduces contamination; (2) temperature versus time profiles can be precisely controlled; (3) wavelength, intensity, and spatial distribution of the incident solar flux can be controlled and changed rapidly; (4) a number of high-temperature processing steps can be performed simultaneously; and (5) combined quantum and thermal effects may benefit overall cell performance. We conclude that HFSF processing of silicon solar cells has the potential to improve cell efficiency, reduce cell fabrication costs, and also be an environmentally friendly manufacturing method. We have also demonstrated that the HFSF can be used to achieve solid-phase crystallization of a-Si:H at very high speed. C1 ENEA,CTR RIC FOTOVOLTAICHE,I-80055 PORTICI,ITALY. RP Tsuo, YS (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 27 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 41 EP 51 DI 10.1016/0927-0248(95)00099-2 PG 11 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200005 ER PT J AU Ciszek, TF Wang, TH Burrows, RW Bekkedahl, T Symko, MI Webb, JD AF Ciszek, TF Wang, TH Burrows, RW Bekkedahl, T Symko, MI Webb, JD TI Effect of nitrogen doping on microdefects and minority charge carrier lifetime of high-purity, dislocation-free and multicrystalline silicon SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB We studied the effects of Si growth in atmospheres containing N-2 on minority charge carrier lifetime tau using a high-purity, induction-heated, neat-zone (FZ) crystal growth method. Ingots were grown with purge gases that ranged from pure argon (99.9995%) to pure N-2 (99.999%). tau was measured as a function of position along the ingots using the ASTM F28-75 photoconductive decay (PCD) method. We found that Ga-doped, multicrystalline silicon ingot growth in a partial or total nitrogen ambient has a negligible effect on minority charge carrier lifetime and no significant grain boundary passivation effect. Values of 40 mu s < tau < 100 mu s were typical regardless of ambient. For dislocation-free (DF) growth, the degradation of tau is minimal and tau values above 1000 mu s are obtained if the amount of N-2 in the purge gas is below the level at which nitride compounds form in the melt and disrupt DF growth. RP Ciszek, TF (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 5 TC 7 Z9 7 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 61 EP 70 DI 10.1016/0927-0248(95)00129-8 PG 10 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200007 ER PT J AU Schubert, WK King, DL Hund, TD Gee, JM AF Schubert, WK King, DL Hund, TD Gee, JM TI 15%-efficient multicrystalline-silicon photovoltaic modules: Cell processing and characterization SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID SOLAR-CELLS AB A relatively simple single-photomask process was used to produce high-efficiency large-area solar cells on commercially available heat-exchanger-method (HEM) multicrystalline silicon (mc-Si). Large-area cell efficiencies up to 16.4% were achieved before lamination. These cells were built into two prototype one-sun modules whose performance has set a new standard for mc-Si photovoltaic modules (15% at standard reporting conditions). These results demonstrate that significant performance gains can be achieved in commercial mc-Si modules with currently available substrates through improved processing. Continued evolutionary developments in substrate and cell manufacturing promise to maintain, and likely improve mc-Si's PV market position. RP Schubert, WK (reprint author), SANDIA NATL LABS,PHOTOVOLTAIC SYST COMPONENTS DEPT,ALBUQUERQUE,NM 87185, USA. NR 27 TC 2 Z9 2 U1 3 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 137 EP 158 DI 10.1016/0927-0248(95)00133-6 PG 22 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200013 ER PT J AU Sopori, BL Deng, X Benner, JP Rohatgi, A Sana, P Estreicher, SK Park, YK Roberson, MA AF Sopori, BL Deng, X Benner, JP Rohatgi, A Sana, P Estreicher, SK Park, YK Roberson, MA TI Hydrogen in silicon: A discussion of diffusion and passivation mechanisms SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; SOLAR-CELLS AB A model for H diffusion and passivation is described that explains the experimental results from solar cell passivation, such as variations in the degree of passivation in substrates from different vendors, passivation due to forming gas anneals following Al alloying, and the effects of plasma enhanced chemical vapor deposition (PECVD) nitridation. Two major features of the model are inclusion of (i) a new H diffusion mechanism involving hydrogen-vacancy complex (V-H) formation, and (ii) surface damage that causes high solubity of H at the Si surface and dissociation of molecular H at low temperatures. The theoretical analysis, based on static potential energy surfaces at the ab-initio Hartree-Fock level, identifies some details of diffusion mechanisms. C1 GEORGIA INST TECHNOL,ATLANTA,GA 30332. TEXAS TECH UNIV,LUBBOCK,TX 79409. RP Sopori, BL (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 26 TC 104 Z9 106 U1 3 U2 25 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 159 EP 169 DI 10.1016/0927-0248(95)00098-4 PG 11 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200014 ER PT J AU Ahrenkiel, RK Levi, D Arch, J AF Ahrenkiel, RK Levi, D Arch, J TI Recombination lifetime studies of silicon spheres SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID CIRCUIT VOLTAGE DECAY; DEVICES AB The fabrication and properties of solar cells made from silicon spheres recently have been described in the literature. Using inexpensive material as feed stock, single crystal 1-mm-diameter spheres are grown by melting silicon particles. Here we will describe the minority-carrier properties of spheres made from both metallurgical grade silicon (MGS) and electronic grade silicon (EGS). Repeated melting and recrystallization of spheres getters impurities at the surface. The surface region is chemically or mechanically etched following each of these melting operations. Here we applied a radio-frequency photoconductive decay technique (RFPCD) for measurement of the minority-carrier lifetime in spheres after each purification step. This is a non-invasive, contactless technique with sensitivity such that the sample size varied from a single sphere to about 100 spheres. The injection level was varied from low-level to high-level injection using a Q-switched YAG laser as the excitation source. The RFPCD decay consisted of a ''fast'' component in all cases, with a lifetime that varied from about 20 ns to 1 or 2 mu s. The latter was attributed to electron-hole recombination. In addition, some spheres had a ''slow'' component that was attributed to shallow traps. The electrical performance of solar cells made from a given sample set correlated with recombination lifetimes of the component spheres, as might be expected. The measurements are a fast and convenient method of characterizing the various materials used in sphere fabrication. C1 TEXAS INSTRUMENTS INC,DALLAS,TX. RP Ahrenkiel, RK (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 14 TC 5 Z9 5 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 171 EP 181 DI 10.1016/0927-0248(95)00130-1 PG 11 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200015 ER PT J AU Catalano, A AF Catalano, A TI Polycrystalline thin-film technologies: Status and prospects SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID CUINSE2 AB The recent progress towards high-efficiency thin-film polycrystalline solar cells is examined in this paper together with a brief history of their development. We focus on the three materials of contemporary interest for such devices: polycrystalline Si, CuInSe2 and its alloys, and CdTe. Although there has often been an implicit assumption that thin-film devices required a compromise of lower efficiency than their single, or bulk polycrystalline competitors, we now see for the first time that polycrystalline thin-film solar cells can rival these devices. In dispelling this myth, we examine the elements that have contributed to the progress in each area. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. NR 40 TC 33 Z9 33 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 EI 1879-3398 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 205 EP 217 DI 10.1016/0927-0248(95)00144-1 PG 13 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200018 ER PT J AU Contreras, MA Tuttle, J Gabor, A Tennant, A Ramanathan, K Asher, S Franz, A Keane, J Wang, L Noufi, R AF Contreras, MA Tuttle, J Gabor, A Tennant, A Ramanathan, K Asher, S Franz, A Keane, J Wang, L Noufi, R TI High efficiency graded bandgap thin-film polycrystalline Cu(In,Ga)Se-2-based solar cells SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Our effort towards the attainment of high performance devices has yielded several devices with total-area conversion efficiencies above 16%, the highest measuring 16.8% under standard reporting conditions (ASTM E892-87, Global 1000 W/m(2)). The first attempts to translate this development to larger areas resulted in an efficiency of 12.5% for a 16.8-cm(2) monolithically interconnected submodule test structure, and 15.3% for a 4.85-cm(2) single cell. Achievement of a 17.2% device efficiency fabricated for operation under concentration (22-sun) is also reported. All high efficiency devices reported here were made from compositional graded absorbers. The compositional Ga/(In + Ga) variations result in absorbers with graded bandgaps and graded carrier concentrations. Two types of bandgap gradings have been fabricated and characterized. We discuss their background for PV action enhancement along with the experimental concepts to grow such structures via coevaporation methods. RP Contreras, MA (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 19 TC 81 Z9 85 U1 1 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 231 EP 246 DI 10.1016/0927-0248(95)00145-X PG 16 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200020 ER PT J AU Gabor, AM Tuttle, JR Bode, MH Franz, A Tennant, AL Contreras, MA Noufi, R Jensen, DG Hermann, AM AF Gabor, AM Tuttle, JR Bode, MH Franz, A Tennant, AL Contreras, MA Noufi, R Jensen, DG Hermann, AM TI Band-gap engineering in Cu(In,Ga)Se-2 thin films grown from (In,Ga)(2)Se-3 precursors SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID CUINSE2 AB A three-stage process starting with the deposition of (In,Ga)(2)Se-3 precursor films has been successful in the fabrication of graded band-gap Cu(In,Ga)Se-2 thin films. In this work we examine (1) the reaction of Cu + Se with (In,Ga)(2)Se-3, which leads to a spontaneous grading in the Ga content as a function of depth through the film, and (2) modification of the Ga content in the surface region of the film through a final deposition of In + Ga + Se. We show how band-gap grading can be enhanced by the formation of non-uniform precursors, how counterdiffusion limits the degree of grading possible in the surface region, and how the CuxSe secondary phase acts to homogenize the film composition. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 90305. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. RP Gabor, AM (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 26 TC 125 Z9 127 U1 1 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 247 EP 260 DI 10.1016/0927-0248(95)00122-0 PG 14 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200021 ER PT J AU Nelson, AJ Gabor, AM Contreras, MA Mason, A AF Nelson, AJ Gabor, AM Contreras, MA Mason, A TI Relation of polycrystalline Cu(In,Ga)Se-2 device efficiency with junction depth and interfacial structure SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID CDS/CUINSE2 HETEROJUNCTION; PHOTOEMISSION; CUINSE2; DEFECTS; FILMS AB The surface versus bulk composition, electronic and physical structure of polycrystalline Cu(In,Ga)Se-2 thin-film interfaces have been characterized using X-ray photoemission spectroscopy (XPS) and positron annihilation spectroscopy (PAS). Angle-resolved high resolution photoemission measurements on the valence band electronic structure and Cu 2p, In 3d, Ga 2p and Se 3d core lines were used to evaluate the surface and near surface chemistry of CuInSe2 and Cu(In,Ga)Se-2 device grade thin films. XPS compositional depth profiles were also acquired from the near surface region. PAS was used as a nondestructive, depth-sensitive probe for open-volume-type defects. Device efficiencies are correlated with these results to show the effects of compositional variations and defect concentrations in the near surface region on device performance. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP Nelson, AJ (reprint author), COLORADO SCH MINES,GOLDEN,CO 80401, USA. NR 24 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 315 EP 323 DI 10.1016/0927-0248(95)00104-2 PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200027 ER PT J AU Menezes, S Kessler, J Schmid, D Schock, HW Matson, RJ AF Menezes, S Kessler, J Schmid, D Schock, HW Matson, RJ TI Use of n-type (Cu2Se)(x)(In2Se3)(1-x) ordered defect chalcopyrite films for solar cell absorber layers SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID CUINSE2; CONVERSION; CUIN3SE5; SYSTEM; GROWTH AB The special attributes of CuIn3Se5 and related In-rich compounds from the (Cu2Se)(x)(In2Se3)(1-x) pseudobinary system are exploited for an absorber layer in a new thin-film photovoltaic cell. Single phase CuIn3Se5 films are synthesized by co-evaporation. Bi-layered n-type films from the (Cu2Se)(x)(In2Se3)(1-x) pseudobinary system with Cu-rich surfaces and 0.5 greater than or equal to x greater than or equal to 0.1, are synthesized by sequential deposition. An electrochemical approach, first developed for CuInSe2, is employed to construct n-(Cu2Se)(x)(In2Se3)(1-x)/p-CuISe3 heterojunctions. This approach leads to a remarkably uniform, clean np-heterointerface and a rough outer surface conducive to light trapping. EPMA, SIMS profiles and XRD analysis examine the (Cu2Se)(x)(In2Se3)(1-x) films and the CuISe3 overlayer. EBIC and I-V analyses investigate the formation of an electrically active n-CuIn3Se5/p-CuISe3 junction. C1 SOLAREX CORP,NEWTOWN,PA 18940. UNIV STUTTGART,INST PHYS ELEKTR,D-7000 STUTTGART 80,GERMANY. NATL RENEWABLE ENERGY LABS,GOLDEN,CO 80401. RP Menezes, S (reprint author), INTERPHASES RES,POB 1532,THOUSAND OAKS,CA, USA. NR 10 TC 3 Z9 3 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 325 EP 334 DI 10.1016/0927-0248(95)00109-3 PG 10 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200028 ER PT J AU Levi, DH Moutinho, HR Hasoon, FS Keyes, BM Ahrenkiel, RK AlJassim, M Kazmerski, LL Birkmire, RW AF Levi, DH Moutinho, HR Hasoon, FS Keyes, BM Ahrenkiel, RK AlJassim, M Kazmerski, LL Birkmire, RW TI Micro through nanostructure investigations of polycrystalline CdTe: Correlations with processing and electronic structures SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; SOLAR-CELLS; GAAS(110) SURFACE; SPECTROSCOPY; HETEROJUNCTIONS; JUNCTIONS AB This paper provides first-time correlations of the nanoscale physical structure with the macroscale electronic and optical properties of CdTe/CdS thin films for several standard deposition techniques. Atomic force microscopy (AFM) was used to determine the micro and nanostructures of polycrystalline CdTe thin films used in photovoltaic (PV) cell fabrication. Photoluminescence (PL) was used to determine band gap, relative defect density, and photoexcited carrier lifetime. Cross-sectional scanning tunneling microscopy (STM) was used to determine the nanoscale electronic properties. Nanostructural features (nanograins), beyond the spatial resolution of conventional scanning electron microscopy (SEM), were observed and characterized in as-deposited CdTe. The correlations of the proximal probe measurements of the physical and electronic structure with the optically determined electronic properties were used to show the effects of the chemical and heat processing, directly and conclusively. A particularly striking effect with important implications for PV applications is the diffusion of sulfur across the CdTe/CdS interface during heat treatment. C1 UNIV DELAWARE, INST ENERGY CONVERS, NEWARK, DE 19716 USA. RP NATL RENEWABLE ENERGY LAB, 1617 COLE BLVD, GOLDEN, CO 80401 USA. NR 29 TC 25 Z9 26 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 EI 1879-3398 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 381 EP 393 DI 10.1016/0927-0248(95)00110-7 PG 13 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200033 ER PT J AU Wanlass, MW Ward, JS Emery, KA AlJassim, MM Jones, KM Coutts, TJ AF Wanlass, MW Ward, JS Emery, KA AlJassim, MM Jones, KM Coutts, TJ TI GaxIn1-xAs thermophotovoltaic converters SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Preliminary research into the development of single-junction GaxIn1-xAs thermophotovoltaic (TPV) power converters is reviewed. The devices structures are grown epitaxially on single-crystal InP substrates. Converter band gaps of 0.50-0.74 eV have been considered in accordance with modeling calculations. A 1-sun, AMO efficiency of 12.8% is reported for a lattice-matched, 0.74-eV converter. Converters with lower band gaps are fabricated using lattice-mismatched, compositionally graded structures. Functional TPV converters with good performance characteristics have been demonstrated for band gaps as low as 0.5 eV. RP Wanlass, MW (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 4 TC 44 Z9 44 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 405 EP 417 DI 10.1016/0927-0248(95)00124-7 PG 13 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200035 ER PT J AU McMahon, TJ Bennett, MS AF McMahon, TJ Bennett, MS TI Metastable shunt paths in a-Si solar cells SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB We have studied the time/voltage dependence of current transients in several different a-Si solar cell structures and have found they reveal more about the basic shunt mechanism. In single-junction cells, we see stepwise current changes that increase in size and number with reverse bias and can be removed with forward bias. This stepwise, on and off switching suggests a discrete shunt path conduction mechanism. The kinetics of these metastable shunt paths show that both the ''on-state'' and ''off-state'' possess memory. Cells without the Al doped ZnO layer (Al)ZnO between the cell and the back contact metal show no metastable switching. We associate the stepwise features with the textured substrate and the switching metastability with contact to (Al)ZnO. Switching in triple-junction cells occurs with hundreds of oscillations at each step. C1 SOLAREX CORP,DIV THIN FILM,NEWTOWN,PA 18940. RP McMahon, TJ (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 10 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 465 EP 473 DI 10.1016/0927-0248(95)00138-7 PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200040 ER PT J AU Burdick, J Pruett, J Beck, E AF Burdick, J Pruett, J Beck, E TI Qualification testing of thin-film and crystalline photovoltaic modules SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB The results of the first complete module qualification testing performed on the photovoltaic (PV) modules of several different manufacturers and a variety of technologies are presented here. Both thin-film and crystalline PV modules are being evaluated. The National Renewable Energy Laboratory (NREL) now has the capability to perform all the tests in the proposed IEEE PV module qualification test sequence. Each test performed will be discussed. In addition, we have developed new test methods and improved techniques as well as engineering solutions to problems encountered with some of the present test procedures. This work not only demonstrates MEL's continuing commitment to work and interact with PV manufacturers to improve their modules from both a performance and a reliability standpoint, but also shows the ongoing effort to validate ASTM test methods and IEEE qualification testing procedures. Finally, this kind of research is needed before further studies of the correlation between indoor, accelerated testing and outdoor, real-world exposure can be made, with the hope of eventually predicting long-term PV module service lifetimes in the field. RP Burdick, J (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 9 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 575 EP 586 DI 10.1016/0927-0248(95)00118-2 PG 12 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200049 ER PT J AU Pern, FJ AF Pern, FJ TI Factors that affect the EVA encapsulant discoloration rate upon accelerated exposure SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID WEATHERING DEGRADATION; FLUORESCENCE ANALYSIS; PHOTODEGRADATION; POLYOLEFINS AB Several factors that affect the discoloration rate of the ethylene-vinyl acetate (EVA) copolymer encapsulants used in crystalline-Si photovoltaic (PV) modules upon accelerated exposure have been investigated primarily by employing UV-visible spectrophotometry, spectrocolorimetry, and fluorescence analysis. A variety of film samples including the two typical (unprimed) EVA formulations, A9918 and 15295, were studied. The films were laminated, cured, and exposed to either a concentrated 1-kW Xe or an enhanced-UV light source. The results indicate that the extent of EVA discoloration can be affected by factors of two general categories: chemical and physical. In the chemical category, the degradative factors include (1) EVA formulation, (2) presence and concentration of curing-generated, UV-excitable chromophores that depend on the type of curing agent used, (3) loss rate of the UV absorber, Cyasorb UV 531(TM), (4) curing agent and curing conditions, and (5) photobleaching reactions due to diffusion of air into the laminated films. In the physical category, the factors involve (6) UV light intensity, (7) UV-filtering effect of glass superstrates, (8) gas permeability of polymeric superstrates, (9) film thickness, and (10) lamination-delamination (maybe chemical and/or mechanical effect, too). Photodecomposition of the Cyasorb was first verified in cyclohexane solutions and then in Elvax 150(TM) (EVX) films (the copolymer without any additives and curing agent). Cyasorb decomposition rates in cyclohexane solutions are exponentially proportional to the light intensity, but can be greatly reduced by a free-radical scavenger, Tinuvin 770(TM), and furthermore by an antioxidant, Naugard P-TM. The discoloration rate of EVA increases with Increasing loss of Cyasorb UV 531 and is faster for the EVA A9918 films that have a greater concentration of UV-excitable chromophores generated from a slower curing than for the EVA 15295 films that are fast cured. In general, the loss rate of the UV absorber and the rate of discoloration from light yellow to brown follow a sigmoidal pattern. A reasonably good correlation for changes in transmittance at 420 nm, yellowness index, and fluorescence peak area (or intensity ratio) is obtained as the extent of EVA discoloration progresses. No discoloration was observed for the laminated EVX films that contain no stabilizers and curing-generated chromophores. The discoloration rate of both types of EVA can be largely reduced by UV-filtering glass superstrates that remove UV < 320 mn. Photobleaching reactions are responsible for the non-discoloration of unlaminated EVA, the visually clear perimeter around the edges of laminated samples, and the EVA films laminated with gas-permeable polymer film superstrates. Delamination of EVA films from the top glass superstrate was observed after prolonged UV exposure. RP Pern, FJ (reprint author), NATL RENEWABLE ENERGY LAB,MEASUREMENTS & CHARACTERIZAT BRANCH,PHOTOVOLTA DIV,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 35 TC 36 Z9 38 U1 2 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 587 EP 615 DI 10.1016/0927-0248(95)00128-X PG 29 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200050 ER PT J AU Strand, T Mrig, L Hansen, R Emery, K AF Strand, T Mrig, L Hansen, R Emery, K TI Technical evaluation of a dual-junction same-band-gap amorphous silicon photovoltaic system SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Monitoring of a 1.8-kW(ac) utility-interconnect photovoltaic (PV) system employing amorphous silicon (a-Si) modules was initiated on December 7, 1992, at our outdoor PV test site. This system was deployed to conduct an in-situ technical evaluation of the PV array (in a high voltage configuration), and system performance and reliability in a utility-interconnect application. The system is unique because construction-grade insulation was added to the back of each PV module. Insulation was added in an attempt to levelize the annual array power output by elevating the operating temperature of the modules (thus enhancing thermal annealing). Array and system performance data are presented and the effects of individual losses as well as seasonal changes on PV array and system performance are quantified. In agreement with past results we show that the seasonal variations in array peak power largely result from changes in current that are well-correlated with temperature and inversely correlated with air mass. Thermally-induced annealing and light-induced degradation are shown to be prominent influences on dual-junction a-Si PV array performance. We also show that fill factor is relatively stable. This is attributed to the opposing influences of thermal and spectral effects, causing a reduction in the seasonal variation in fill factor. RP Strand, T (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 5 TC 15 Z9 15 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 617 EP 628 DI 10.1016/0927-0248(95)00132-8 PG 12 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200051 ER PT J AU Osterwald, CR Hammond, R Zerlaut, G DAiello, R AF Osterwald, CR Hammond, R Zerlaut, G DAiello, R TI Photovoltaic module certification and laboratory accreditation criteria development SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB This paper presents an overview of a model product certification and test laboratory accreditation program for photovoltaic (PV) modules that was recently developed by the National Renewable Energy Laboratory and Arizona State University. The specific objective of this project was to produce a document that details the equipment, facilities, quality assurance procedures, and technical expertise an accredited laboratory needs for performance and qualification testing of PV modules, along with the specific tests needed for a module design to be certified. The document was developed in conjunction with a criteria development committee consisting of representatives from 30 US PV manufacturers, end users, standards and codes organizations, and testing laboratories. The intent is to lay the groundwork for a future US PV certification and accreditation program that will be beneficial to the PV industry as a whole. C1 ARIZONA STATE UNIV,TEMPE,AZ. SC INT,PHOENIX,AZ. RD ASSOCIATES,TEMPE,AZ. RP Osterwald, CR (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 629 EP 636 DI 10.1016/0927-0248(95)00121-2 PG 8 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200052 ER PT J AU Eberspacher, C Charles, FG Moskowitz, PD AF Eberspacher, C Charles, FG Moskowitz, PD TI Strategies for enhancing the commercial viability of CdTe-based photovoltaics SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Environmental, health and safety (EH&S) issues related to the handling and disposal of end-of-life thin-film cadmium telluride (CdTe) photovoltaic (PV) modules were examined to determine their potential impacts on the commercialization of this new product. An assessment of existing EH&S data on CdTe PV products revealed the need for additional testing, the need for quantitative surveys of existing customer opinions, the value of appropriate positive comparisons, and the potential advantages of collection and recycling programs. A survey of the PV industry and selected customers indicated that prospective users were not overly concerned about EH&S issues; that they identified Cd content as a key issue when explaining any concerns they did have; and, that they are willing to purchase CdTe PV modules if the price and performance are competitive, if CdTe PV technology is endorsed by users like themselves, and, if there exists a convenient method of handling end-of-life modules. An analysis of public acceptance strategies of industries facing comparable EH&S issues revealed that public relations, regulations, and/or commercial necessity may justify collection and recycling programs for end-of-life CdTe modules. Estimates of the economics of reclaiming CdTe PV modules indicated costs of $0.15-0.25/Wp due, in large part, to the collection and processing expenses. Key strategy recommendations include additional testing to clearly establish EH&S hazards for CdTe-based compounds, programs to educate customers and the public on the nature of these compounds, and further exploration of alternative end-of-life module collection and recycling options. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,BIOMED & ENVIRONM ASSESSMENT GRP,UPTON,NY 11973. RP Eberspacher, C (reprint author), UNISUN,NEWBURY PARK,CA 91320, USA. NR 19 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1996 VL 41-2 BP 637 EP 653 DI 10.1016/0927-0248(95)00120-4 PG 17 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA UY852 UT WOS:A1996UY85200053 ER PT J AU Oparin, AB Quinn, JJ AF Oparin, AB Quinn, JJ TI Magnetic field dependence of the carrier concentration in a modulation doped dilute magnetic semiconductor quantum well structure SO SOLID STATE COMMUNICATIONS LA English DT Article DE magnetic films and multilayers; quantum wells; semiconductors AB The subband structure of a dilute magnetic semiconductor (DMS) quantum well embedded in a modulation doped non-magnetic host is evaluated as a function of applied magnetic field. Because of the large effective g-value of carriers in the DMS layer, the application of a de magnetic field can lead to a strong spin polarization of the electron gas in the quantum well. For a quantum well containing few carriers at zero magnetic field, a substantial increase in carrier concentration can result from the application of a de magnetic field. Copyright (C) 1996 Published by Elsevier Science Ltd. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Oparin, AB (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 5 TC 14 Z9 14 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUN PY 1996 VL 98 IS 9 BP 791 EP 794 DI 10.1016/0038-1098(96)00203-7 PG 4 WC Physics, Condensed Matter SC Physics GA UM381 UT WOS:A1996UM38100005 ER PT J AU Neue, G Dybowski, C Smith, ML Hepp, MA Perry, DL AF Neue, G Dybowski, C Smith, ML Hepp, MA Perry, DL TI Determination of Pb-207(2+) chemical shift tensors from precise powder lineshape analysis SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article DE chemical shift tensor; NMR; Pb-207; referencing; solid state ID NMR; LEAD AB Pb-207 Solid State NMR powder spectra at 296 K are presented for PbSO4, PbMoO4, PbCrO4, PbCO3, PbTiO3, PbZrO3, Pb(NO3)(2), Pb(SCN)(2), and PbS. Analysis for principal values of the anisotropic chemical shift tensors of the generally very broad spectra included the frequency dependent excitation of the pulse sequence used. Commonly used solid and liquid secondary shift standards for lead were studied with high precision as a function of temperature between 295 K and 315 K to establish a clean Pb-207 shift scale. Errors in the existing literature are discussed. C1 UNIV DELAWARE,DEPT CHEM & BIOCHEM,NEWARK,DE 19716. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP Neue, G (reprint author), UNIV DORTMUND,D-44221 DORTMUND,GERMANY. NR 34 TC 68 Z9 70 U1 0 U2 29 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD JUN PY 1996 VL 6 IS 3 BP 241 EP 250 DI 10.1016/0926-2040(95)01225-7 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA VD365 UT WOS:A1996VD36500005 PM 8863378 ER PT J AU Scherer, JJ Paul, JB Collier, CP OKeefe, A Rakestraw, DJ Saykally, RJ AF Scherer, JJ Paul, JB Collier, CP OKeefe, A Rakestraw, DJ Saykally, RJ TI Cavity ringdown laser spectroscopy: A new ultrasensitive absorption technique SO SPECTROSCOPY LA English DT Article ID FLIGHT MASS-SPECTROSCOPY; FAST ION-BEAMS; DOWN SPECTROSCOPY; SILICIDES; KINETICS; BANDS AB A simple and powerful new spectroscopic technique for performing direct absorption measurements is described. Commercial pulsed laser systems can achieve absorption sensitivities >1 ppm at measurement times of 10(-5) s with high spatial and spectral resolution. Applications for spectroscopy, kinetics, in situ flame studies, and trace-gas analysis are described. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LOS GATOS RES,MT VIEW,CA 94043. RI Collier, Charles/C-9206-2016 OI Collier, Charles/0000-0002-8198-793X NR 20 TC 18 Z9 18 U1 0 U2 7 PU ADVANSTAR COMMUNICATIONS PI DULUTH PA 131 W FIRST ST, DULUTH, MN 55802 SN 0887-6703 J9 SPECTROSCOPY JI Spectroscopy PD JUN PY 1996 VL 11 IS 5 BP 46 EP 50 PG 5 WC Spectroscopy SC Spectroscopy GA VJ165 UT WOS:A1996VJ16500005 ER PT J AU Nicolussi, GK Pellin, MJ Lykke, KR Trevor, JL Mencer, DE Davis, AM AF Nicolussi, GK Pellin, MJ Lykke, KR Trevor, JL Mencer, DE Davis, AM TI Surface analysis by SNMS: Femtosecond laser postionization of sputtered and laser desorbed atoms SO SURFACE AND INTERFACE ANALYSIS LA English DT Article ID NONRESONANT MULTIPHOTON IONIZATION; KINETIC-ENERGY DISTRIBUTIONS; RESONANCE IONIZATION; MASS-SPECTROMETRY; CLUSTERS; GENERATION; VELOCITY; YIELDS; PULSES AB The photoionization efficiency of secondary neutral atoms from metal surfaces has been investigated by very intense (similar to 10(14) W cm(-2)) and short-pulsed (similar to 200 fs) 248 nm laser radiation, Surface erosion of the samples was performed by Ar+ ion sputtering and by laser desorption (LD) from an N-2 gas laser. Five polycrystalline samples (Al, Cu, Zr, In and Au) have been analyzed with respect to their ionization efficiency and LD yields. In order to estimate the desorption yield, we determined the useful yield of our time-of-flight (ToF) mass spectrometer by ion sputtering, followed by laser postionization with 193 nm radiation from an ArF excimer laser, The applied femto-second pulse, high-intensity 248 nm laser radiation has been found to be an excellent source of non-selective photoionization, For each material in this study a large fraction of doubly ionized atoms was observed; the measurements on Au have also shown triply ionized atoms, For some spectra, the number of doubly ionized atoms was even higher than for singly ionized atoms. We have estimated that the useful yields for LD are significantly higher than the values observed in ion sputtering. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT CHEM,CHICAGO,IL 60607. AURORA UNIV,DEPT CHEM,AURORA,IL 60506. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. RP Nicolussi, GK (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,BLDG 200,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008; OI Pellin, Michael/0000-0002-8149-9768; Davis, Andrew/0000-0001-7955-6236 NR 34 TC 30 Z9 30 U1 0 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JUN PY 1996 VL 24 IS 6 BP 363 EP 370 DI 10.1002/(SICI)1096-9918(199606)24:6<363::AID-SIA129>3.0.CO;2-U PG 8 WC Chemistry, Physical SC Chemistry GA UT976 UT WOS:A1996UT97600001 ER PT J AU Tobin, JG Waddill, GD Tamura, E Sterne, P Bedrossian, PJ Pappas, DP Guo, X Tong, SY AF Tobin, JG Waddill, GD Tamura, E Sterne, P Bedrossian, PJ Pappas, DP Guo, X Tong, SY TI Magnetic x-ray circular dichroism in photoelectron spectroscopy and diffraction SO SURFACE REVIEW AND LETTERS LA English DT Article ID CORE-LEVEL PHOTOEMISSION; FCC FE FILMS; SPIN-POLARIZATION; ANGULAR-DISTRIBUTION; ULTRATHIN FILMS; SELF-ENERGY; SCATTERING; CU(100); FE/CU(001); NI AB In this paper, we discuss a series of photoelectron-spectroscopy (PS) and photoelectron-diffraction (PD) studies utilizing magnetic x-ray circular dichroism and fully spin-specific, multiple-scattering calculations for analysis of the experimental results. The test system used was perpendicularly magnetized, ferromagnetic monolayer Fe/Cu(001), prepared and probed at low temperature. Two sets of states were used: the Fe2p at binding energies of over 700 eV (large spin-orbit and small exchange splittings) and the Fe3p at a binding energy of near 53 eV (spin-orbit and exchange splittings approximately equal). The PS and PD measurements made were angularly resolving and compared to calculational results which were similarly angularly dependent. Both ''exchange shifts'' and intensity variations of spectral structure were observed. The impact of ''j-state mixing'' was seen in both the Fe2p and 3p spectra. Our results indicate a ferromagnetically ordered FCC Fe with a lattice parameter near that of bulk Cu. Nevertheless, the sensitivity of the multiple-scattering calculations of both the Fe2p and Fe3p simulations to local order has been used to show that the overlayer structure posseses some level of imperfection or disorder as well. C1 UNIV MISSOURI, ROLLA, MO 65401 USA. UNIV CALIF DAVIS, DAVIS, CA 95616 USA. VIRGINIA COMMONWEALTH UNIV, RICHMOND, VA 23284 USA. UNIV WISCONSIN, MILWAUKEE, WI 53201 USA. RP Tobin, JG (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RI Tobin, James/O-6953-2015 NR 69 TC 7 Z9 7 U1 1 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-625X J9 SURF REV LETT JI Surf. Rev. Lett. PD JUN PY 1996 VL 3 IS 3 BP 1429 EP 1448 DI 10.1142/S0218625X9600245X PG 20 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA VK335 UT WOS:A1996VK33500013 ER PT J AU Zhang, ZY Wu, F Lagally, MG AF Zhang, ZY Wu, F Lagally, MG TI Kinetics, dynamics and mutual interactions of defects on Si(001) SO SURFACE REVIEW AND LETTERS LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; SI(100) SURFACE; SI DEPOSITION; DIMER-VACANCY; HOMOEPITAXIAL GROWTH; DIFFUSION-BARRIERS; EPITAXIAL-GROWTH; VICINAL SI(001); MISSING-DIMER; SINGLE-LAYER AB This article gives a critical review of the recent progress in the understanding of the physical properties of defects on Si(001). Mainly two classes of defects will be considered: point defects, including adatoms, ad-dimers, atom vacancies and dimer vacancies; and line defects, including steps, dimer strings, antiphase boundaries and vacancy lines. The focus will be on the kinetic and dynamic properties of the defects. Also discussed are their mutual interactions. A combination of extensive theoretical and experimental studies has provided clear answers to several fundamental questions about defect energetics and dynamics, and in some other cases has resulted in plausible solutions. In surveying some open or controversial issues, likely future directions will be discussed as well. C1 UNIV WISCONSIN,MADISON,WI 53706. RP Zhang, ZY (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. NR 73 TC 14 Z9 15 U1 1 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-625X J9 SURF REV LETT JI Surf. Rev. Lett. PD JUN PY 1996 VL 3 IS 3 BP 1449 EP 1462 DI 10.1142/S0218625X96002461 PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA VK335 UT WOS:A1996VK33500014 ER PT J AU Kuhn, M Rodriguez, JA AF Kuhn, M Rodriguez, JA TI Photoemission studies of S/Co/Mo(110) and S/Ni/Mo(110) surfaces: Co- and Ni-promoted sulfidation of Mo(110) SO SURFACE SCIENCE LA English DT Article DE ab initio quantum chemical methods and calculations; catalysis; cobalt; molybdenum; nickel; photoelectron spectroscopy; sulphides; surface chemical reaction ID X-RAY PHOTOELECTRON; MOSSBAUER EMISSION-SPECTROSCOPY; HYDRODESULFURIZATION CATALYSTS; ELECTRONIC-PROPERTIES; METAL SULFIDES; FILMS; COBALT; SULFUR; ADSORPTION; ADSORBATES AB The properties of a series of X/Mo(110) and S/X/Mo(110) surfaces (X=Co or Ni) have been examined using photoemission, thermal desorption spectroscopy and ab initio SCF calculations. The bimetallic bonds in the Co/Mo(110) and Ni/Mo(110) systems are complex, involving Co(3d,4s)-->Mo(5s,5p) and Ni(3d,4s)-->Mo(5s,5p) electron transfers and a Mo(4d)-->Mo(5s,5p) rehybridization. These redistributions of charge lead to positive core-level shifts for all the metals. The exposure of Mo(110) to large amounts of S-2 gas produces only a chemisorbed layer of sulfur, without forming molybdenum sulfides. The sulfidation of Mo occurs after exposing Co/Mo(110) and Ni/Mo(110) surfaces to S-2. Co and Ni promote the formation of molybdenum sulfides by transferring charge to Mo (favoring in this way an electrophilic attack of S on Mo), and by changing the structure of the surface (making it easier for the penetration of S into the bulk of the sample). Co and Ni exhibit a unique ability to enhance the Mo<->S interactions. A comparison of the behavior of several admetals on S/Mo(110) surfaces indicates that the ''promotional effect'' of an admetal on the sulfidation of Mo increases in the following order: Ag approximate to ZnS interactions. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 76 TC 33 Z9 33 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP 85 EP 99 DI 10.1016/0039-6028(96)00005-2 PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200035 ER PT J AU Parks, EK Nieman, GC Riley, SJ AF Parks, EK Nieman, GC Riley, SJ TI Binding of deuterium to icosahedral nickel and cobalt clusters SO SURFACE SCIENCE LA English DT Article DE chemisorption; clusters; cobalt; hydrides; nickel ID IRON CLUSTERS; HYDROGEN; AMMONIA; SURFACES; CHEMISORPTION; DEPENDENCE; ADSORPTION; COVERAGE; NI(111); NI(100) AB The binding of deuterium atoms to icosahedral nickel and cobalt clusters in the 55 to 147 atom size region is studied at near room temperature conditions. The icosahedral clusters have closed shells at 55 and 147 atoms and closed subshells at many intermediate sizes. Deuterium saturation levels are determined for many of the closed shell and subshell clusters in this size region. From the series of saturation levels a set of binding rules (appropriate to room temperature conditions) have been determined that allow a prediction of the observed coverages for the entire series of closed shell and subshell clusters. The configurations of D-atom binding sites for clusters containing 55, 71, 83, 92, 101, 116, and 147 atoms are given, In general, the ratio of D atoms to surface metal atoms is near unity. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. MONMOUTH COLL, DEPT CHEM, MONMOUTH, IL 61642 USA. NR 34 TC 15 Z9 15 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP 127 EP 139 DI 10.1016/0039-6028(95)01364-4 PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200039 ER PT J AU Henderson, MA AF Henderson, MA TI An HREELS and TPD study of water on TiO2(110): The extent of molecular versus dissociative adsorption SO SURFACE SCIENCE LA English DT Article DE electron energy loss spectroscopy; low index single crystal surfaces; solid-gas interfaces; surface chemical reaction; thermal desorption; thermal desorption spectroscopy; titanium oxide; vibrations of adsorbed molecules; water ID ENERGY-LOSS SPECTROSCOPY; OXIDE SURFACES; INFRA-RED; RUTILE SURFACES; LOSS SPECTRUM; TIO2; H2O; RESONANCES; DESORPTION; MGO(100) AB The interaction of water with the (110) crystal face of TiO2 (rutile) was examined with high resolution electron energy loss spectroscopy (HREELS) and temperature programmed desorption (TPD). Water desorption occurred in three sequential TPD features as a function of exposure at 270, 175 and 155 K, ascribed to monolayer, second layer and multilayer states, respectively. Estimation of the extent to which water molecularly versus dissociatively adsorbed on the TiO2(110) surface was attempted by comparing HREELS and TPD data. Very low water exposures (below 7x10(13) molecules/cm(2)) dissociatively adsorbed at 135 K to surface hydroxyl groups (nu(OH)=3690 cm(-1)), but molecular adsorption (nu(OH)=3420-3505 cm(-1) and delta(HOH)=1625 cm(-1)) resulted from additional water exposure. The appearance of molecular water in HREELS coincided with a red-shift in the O-H stretching frequency of the hydroxyl, presumably due to the formation of hydrogen-bonding interactions with the adsorbed water molecules. Little or no additional water dissociation occurred during heating of the monolayer as inferred from HREELS. Second layer water on TiO2(110) was evident in HREELS by O-H stretching intensity below 3400 cm(-1) indicative of hydrogen-bonding. However, the O-H stretching mode of monolayer water molecules was not red-shifted by the presence of second layer water suggesting that protons on monolayer water molecules were nor involved in hydrogen-bonding second layer water molecules. The influence of second layer water on subsequent layers was evident in both HREELS and TPD. RP Henderson, MA (reprint author), PACIFIC NW LAB, ENVIRONM MOL SCI LAB, MAT & INTERFACES GRP, POB 999, RICHLAND, WA 99352 USA. NR 49 TC 375 Z9 379 U1 11 U2 133 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP 151 EP 166 DI 10.1016/0039-6028(95)01357-1 PG 16 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200041 ER PT J AU Hjortstam, O Trygg, J Wills, JM Johansson, B Eriksson, O AF Hjortstam, O Trygg, J Wills, JM Johansson, B Eriksson, O TI Surface layer relaxation for Be(10(1)over-bar0): Theory SO SURFACE SCIENCE LA English DT Article DE beryllium; density functional calculational; surface electronic phenomena; surface relaxation and reconstruction ID 4D TRANSITION-METALS; ELECTRONIC-STRUCTURE; MULTILAYER RELAXATION; ENERGY; IMPURITIES; BE(0001); NOBLE AB We predict an inwards surface relaxation of the (<10(1)over bar 0>) surface of Be. The surface layer relaxes inwards with 25% of the inter planar distance, a rather large value. However, the corresponding change of nearest-neighbour interatomic distances is smaller, of the order 2-6%. We show that the relaxation is correlated with a pronounced surface state in the vicinity of the Fermi level. By following the inward relaxation of the surface layer, we show that the total energy is lowered mainly due to the one-particle energy. The most preferable termination of the Be(<10(1)over bar 0>) surface is shown to be the so-called A termination. Also, the termination of the Be(0001) is investigated and we conclude that the hcp termination is preferable compared to the fee termination. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP Hjortstam, O (reprint author), UNIV UPPSALA,DEPT PHYS,CONDENSED MATTER THEORY GRP,S-75121 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 39 TC 2 Z9 2 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 JUN 1 PY 1996 VL 355 IS 1-3 BP 214 EP 220 DI 10.1016/0039-6028(96)01374-X PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200045 ER PT J AU Hu, J Xiao, XD Ogletree, DF Salmeron, M AF Hu, J Xiao, XD Ogletree, DF Salmeron, M TI The structure of molecularly thin films of water on mica in humid environments (vol 344, pg 221, 1995) SO SURFACE SCIENCE LA English DT Correction, Addition C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. ACAD SINICA,SHANGHAI INST NUCL RES,SHANGHAI 201800,PEOPLES R CHINA. NR 1 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP 255 EP 255 DI 10.1016/0039-6028(96)00614-0 PG 1 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200050 ER PT J AU Doll, R VanHove, MA AF Doll, R VanHove, MA TI Global optimization in LEED structure determination using genetic algorithms SO SURFACE SCIENCE LA English DT Letter DE electron-solid diffraction; iridium; low energy electron diffraction (LEED); low index single crystal surfaces; surface structure ID ENERGY-ELECTRON-DIFFRACTION; SURFACE-STRUCTURE DETERMINATION; TENSOR LEED; CRYSTALLOGRAPHY AB By application of search algorithms, low energy electron diffraction (LEED) structure determination is now capable of solving relatively complicated systems. However, since LEED is a diffraction technique, the danger remains in identifying an incorrect structure because a local rather than a global minimum in the R-factor hypersurface was found. Recently it has been suggested that simulated annealing could be employed to circumvent this potential problem. In this Letter, using the Ir(110)-(1 x 2) missing row structure as an example, we demonstrate that genetic algorithms can also be used for a full structural analysis. Our results indicate that a rough global search using a genetic algorithm, followed by structural refinement using conventional steepest descent methods, should yield the correct structure within a typically tractable timescale. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 25 TC 33 Z9 34 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L393 EP L398 DI 10.1016/0039-6028(96)00608-5 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200027 ER PT J AU Herdt, GC Czanderna, AW King, DE AF Herdt, GC Czanderna, AW King, DE TI Adsorption of water onto mercaptohexadecanoic acid self-assembled monolayers using a quartz crystal microbalance SO SURFACE SCIENCE LA English DT Letter ID ORGANIC-SURFACES AB A vacuum quartz crystal microbalance (QCM) apparatus was used to measure water adsorption isotherms on mercaptohexadecanoic acid (HS(CH2)(15)COOH-MHA) self assembled monolayers (SAMs) on Au coated quartz crystals. Isotherms measured over a temperature range of 20-45 degrees C are consistent with a strong interaction between adsorbed water and the COOH terminated surface of the SAM. From comparison of our data with calculated BET isotherms we estimate the isosteric heat of adsorption for this system to be ca. 12 kcal/mol. RP Herdt, GC (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 14 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L371 EP L374 DI 10.1016/0039-6028(96)00312-3 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200023 ER PT J AU Hofmann, P Stumpf, R Silkin, VM Chulkov, EV Plummer, EW AF Hofmann, P Stumpf, R Silkin, VM Chulkov, EV Plummer, EW TI The electronic structure of Be(10(1)over-bar-0) SO SURFACE SCIENCE LA English DT Letter DE alkaline earth metals; angle resolved photoemission; density functional calculations; low index single crystal surfaces; surface electronic phenomena ID SURFACE; BE(0001) AB We measured the surface state dispersions on Be(<10(1)over bar 0>) by angle-resolved photoemission (ARUPS) and calculated the electronic structure for both possible terminations of the bulk crystal from first principles. The experimental data agrees only viith the prediction for the termination with the shorter first interlayer spacing. This is also supported by a comparison between our calculation of the surface core-level shift spectrum with the experimental data from Johansson et al. However, in contrast to their interpretation, our calculation predicts a larger surface core level shift for second-layer Be atoms than for first-layer atoms. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RUSSIAN ACAD SCI, INST STRENGTH PHYS & MAT SCI, TOMSK 634021, RUSSIA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. UNIV BASQUE COUNTRY, FAC QUIM, DPTO FIS MAT, E-20080 SAN SEBASTIAN, SPAIN. RP Hofmann, P (reprint author), UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. RI Hofmann, Philip/B-5938-2008; Silkin, Vyacheslav/G-5446-2011 OI Hofmann, Philip/0000-0002-7367-5821; Silkin, Vyacheslav/0000-0002-7840-3868 NR 19 TC 27 Z9 27 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L278 EP L282 DI 10.1016/0039-6028(96)80065-3 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200006 ER PT J AU Roos, KR Tringides, MC AF Roos, KR Tringides, MC TI Finite size effects in nucleation processes SO SURFACE SCIENCE LA English DT Letter DE computer simulations; molecular beam epitaxy; nucleation; surface diffusion AB We have used Monte Carlo simulations to study the scaling relations describing submonolayer nucleation N proportional to F-y/D-x theta(z) as a function of system size L (where N is the nucleated island density, D the diffusion coefficient, F the flux rate, a the coverage). For island size distributions that obey scaling, the island density N can be easily related to the step density, S-D. A simple model of critical size cluster i(c)=1 is used. For a given system size L there is a minimum (D/F)(min) ratio where scaling breaks down with x=y=0. These considerations are relevant to systems with low terrace diffusion barrier or small substrate terraces. C1 BRADLEY UNIV, DEPT PHYS, PEORIA, IL USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. NR 5 TC 8 Z9 8 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L259 EP L263 DI 10.1016/0039-6028(96)00610-3 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200003 ER PT J AU Simpson, WC Yarmoff, JA Hung, WH McFeely, FR AF Simpson, WC Yarmoff, JA Hung, WH McFeely, FR TI Remote inductive effects in the Si 2p spectra of halogenated silicon SO SURFACE SCIENCE LA English DT Letter DE halogens; low index single crystal surfaces; photoelectron emission; silicon; soft X-ray photoelectron spectroscopy ID PHOTON-STIMULATED DESORPTION; X-RAY PHOTOEMISSION; ELECTRONIC-STRUCTURE; FLUORINE-ATOMS; SURFACES; CHLORINE; XEF2; CHEMISORPTION; ADSORPTION; SI(111)7X7 AB Si 2p spectra collected from fluorinated Si(111)-7 x 7 are analyzed to determine whether chemical shifts induced by remote F atoms are discernible. Although the traditional interpretation adequately accounts for the observed chemical shifts without considering remotely induced shifts, recent experimental evidence indicates that such shifts may occur for highly electronegative adsorbates. Thus, an extended scheme is outlined that is consistent with all known data, but which includes remotely induced shifts. It is found that, although they differ quantitatively, both approaches yield the same qualitative results for fluorinated Si. C1 UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. IBM CORP,DIV RES,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. NR 27 TC 3 Z9 3 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L283 EP L288 DI 10.1016/0039-6028(96)00517-1 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200007 ER PT J AU Staley, M Papageorgopoulos, C Roos, KR Tringides, MC AF Staley, M Papageorgopoulos, C Roos, KR Tringides, MC TI RHEED studies of interlayer diffusion in the submonolayer growth regime on Ag/Ag(111) SO SURFACE SCIENCE LA English DT Letter DE molecular beam epitaxy; nucleation; reflection high-energy electron diffraction; (RHEED); silver; surface diffusion ID BY-LAYER GROWTH; AG; AG(111) AB We have used reflection high-energy electron diffraction (RHEED) to study the growth of Ag/Ag(111) as a function of temperature T=150-315 K and flux rate F=1/125-1/4800 ML/s by monitoring the decay of the specular beam intensity. No oscillations are observed, which is consistent with a 3D growth mode and the existence of a step edge barrier. The intensity decay is independent of flux rate but depends on temperature. This can be understood in terms of the high diffusion rate on the finite substrate terraces(similar to 500 Angstrom), which results in breakdown of the scaling conditions for nucleation and interlayer diffusion from higher to lower terraces. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. UNIV IOANNINA, DEPT PHYS, GR-45110 IOANNINA, GREECE. BRADLEY UNIV, DEPT PHYS, PEORIA, IL 61625 USA. NR 17 TC 10 Z9 10 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L264 EP L270 DI 10.1016/0039-6028(96)00611-5 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200004 ER PT J AU Weitering, HH AF Weitering, HH TI New barium-induced surface reconstructions on Si(111) SO SURFACE SCIENCE LA English DT Letter DE alkaline-earth metals; Auger electron spectroscopy; growth; metal-semiconductor interfaces; oxidation; silicon; surface relaxation and reconstruction; workfunction measurements ID BA/SI(100)-2X1 INTERFACE; SI(100) SURFACE; BA; PHOTOEMISSION; ADSORPTION; SILICIDE; SEMICONDUCTOR; INSULATOR; XPS; YB AB The growth of Ba on Si(111)7 x 7 at room temperature proceeds in a layer-by-layer fashion up to at least two full layers. Upon subsequent annealing, four new sub-monolayer surface reconstructions can be identified. The (3 x 1), (5 x 1) and (2 x 8) reconstructions are formed at absolute coverages not larger than 0.35, 0.50 and 0.65 monolayer (ML), respectively. A (root 3 x root 3)R30 degrees reconstruction co-exists with each of these phases and possibly comprises a pseudo-centered orthorhombic BaSi2(100) layer. Epitaxial BaSi2 is formed under supersaturation conditions at substrate temperatures near 600 degrees C. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP Weitering, HH (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 33 TC 47 Z9 47 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1996 VL 355 IS 1-3 BP L271 EP L277 DI 10.1016/0039-6028(95)01348-2 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV662 UT WOS:A1996UV66200005 ER PT J AU Frederick, WJ Iisa, K Lundy, JR OConnor, WK Reis, K Scott, AT Sinquefield, SA Sricharoenchaikul, V VanVooren, CA AF Frederick, WJ Iisa, K Lundy, JR OConnor, WK Reis, K Scott, AT Sinquefield, SA Sricharoenchaikul, V VanVooren, CA TI Energy and materials recovery from recycled paper sludge SO TAPPI JOURNAL LA English DT Article AB The authors studied the pyrolysis, gasification characteristics, and the properties of the ash produced from primary sludge in a recycled fiber plant. The heating value of the sludge was 8.38 MJ/kg. The pyrolysis gases contained primarily acetaldehyde, CO, CO2, methane, and ethylene. Evaluation of ash from a large-scale gasification test as a mineral admixture for Portland cement concrete showed it was unsatisfactory as is. Selection of better process conditions for gasification may resolve this. This authors developed a process for converting recycled fiber sludge to a low to medium heating value fuel gas with a total thermal efficiency of 70%. C1 OREGON STATE UNIV,DEPT CIVIL ENGN,CORVALLIS,OR 97330. US BUR MINES,ALBANY RES CTR,US DEPT INTERIOR,ALBANY,OR 97321. RP Frederick, WJ (reprint author), OREGON STATE UNIV,DEPT CHEM ENGN,GLEESON 103,CORVALLIS,OR 97330, USA. NR 11 TC 10 Z9 10 U1 0 U2 2 PU TECH ASSN PULP PAPER IND INC PI NORCROSS PA 15 TECHNOLOGY PARK SOUTH, NORCROSS, GA 30092 SN 0734-1415 J9 TAPPI J JI TAPPI J. PD JUN PY 1996 VL 79 IS 6 BP 123 EP 131 PG 9 WC Materials Science, Paper & Wood SC Materials Science GA UP836 UT WOS:A1996UP83600019 ER PT J AU Wong, AT Harrison, RJ Rendell, AP AF Wong, AT Harrison, RJ Rendell, AP TI Parallel direct four-index transformations SO THEORETICA CHIMICA ACTA LA English DT Article DE parallel; four-index transformation; Moller-Plesset ID 4-INDEX TRANSFORMATION; MP2 ENERGY; ALGORITHMS AB Two parallel direct integral transformation algorithms are presented, Specific attention is directed to producing transformed integrals containing at least two ''active orbital'' indices. The number of active orbitals is typically much less than the total number of molecular orbitals reflecting the requirements of a wide range of correlated electronic structure methods. Sample direct second-order Moller-Plesset theory calculations are reported. For situations where multipassing of the integrals is required, superlinear speedup is obtained by exploiting the increase in global memory. As a consequence, for morphine in a 6-31G basis, a speedup of over 25 is observed in scaling from 32 to 512 processors. C1 SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. RP Wong, AT (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Rendell, Alistair/A-4883-2008 OI Rendell, Alistair/0000-0002-9445-0146 NR 21 TC 27 Z9 27 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0040-5744 J9 THEOR CHIM ACTA JI Theor. Chim. Acta PD JUN PY 1996 VL 93 IS 6 BP 317 EP 331 DI 10.1007/s002140050156 PG 15 WC Chemistry, Physical SC Chemistry GA UT564 UT WOS:A1996UT56400001 ER PT J AU Edwards, NT Hanson, PJ AF Edwards, NT Hanson, PJ TI Stem respiration in a closed-canopy upland oak forest (vol 16, pg 433, 1996) SO TREE PHYSIOLOGY LA English DT Correction, Addition RP Edwards, NT (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Hanson, Paul J./D-8069-2011 OI Hanson, Paul J./0000-0001-7293-3561 NR 1 TC 0 Z9 0 U1 2 U2 6 PU HERON PUBLISHING PI VICTORIA PA BOX 5579 STATION B, VICTORIA BC V8R 6S4, CANADA SN 0829-318X J9 TREE PHYSIOL JI Tree Physiol. PD JUN PY 1996 VL 16 IS 6 BP 595 EP 595 PG 1 WC Forestry SC Forestry GA UP035 UT WOS:A1996UP03500009 ER PT J AU Jones, JB Holmes, RM AF Jones, JB Holmes, RM TI Surface-subsurface interactions in stream ecosystems SO TRENDS IN ECOLOGY & EVOLUTION LA English DT Review ID DISSOLVED ORGANIC-MATTER; HYPORHEIC ZONE; EXCHANGE; WATER; TRANSPORT; CARBON AB Stream ecologists have recently recognized that sediments below streams play an important role in lotic ecosystems. Water flows not only across the surface of stream channels, but also through sediment interstices; consequently, surface and subsurface biogeochemical processes are linked. Recent attempts to understand the influence of subsurface processes on stream ecosystems have tried to resolve the surface-subsurface hydrologic interactions, and to gain knowledge of the ecology of subsurface organisms. C1 MARINE BIOL LAB,CTR ECOSYST,WOODS HOLE,MA 02543. RP Jones, JB (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,BLDG 1506,OAK RIDGE,TN 37831, USA. NR 32 TC 140 Z9 144 U1 6 U2 29 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0169-5347 J9 TRENDS ECOL EVOL JI Trends Ecol. Evol. PD JUN PY 1996 VL 11 IS 6 BP 239 EP 242 DI 10.1016/0169-5347(96)10013-6 PG 4 WC Ecology; Evolutionary Biology; Genetics & Heredity SC Environmental Sciences & Ecology; Evolutionary Biology; Genetics & Heredity GA UL788 UT WOS:A1996UL78800006 PM 21237825 ER PT J AU Migliori, A Darling, TW AF Migliori, A Darling, TW TI Resonant ultrasound spectroscopy for materials studies and non-destructive testing SO ULTRASONICS LA English DT Article; Proceedings Paper CT Ultrasonics International 1995 (UI 95) CY JUL 05-07, 1995 CL EDINBURGH, SCOTLAND SP Elsevier Sci DE ultrasonics; elastic moduli; resonant ultrasound; non-destructive testing ID SOLIDS AB The use of mechanical resonances to test properties of materials is older than the industrial revolution. Early documented cases of British railroad engineers tapping the wheels of a train and using the sound to detect cracks perhaps marks the first real use of resonances to test the integrity of high-performance alloys. Attempts were made in the following years to understand the resonances of solids mathematically, based on shape and composition. But Nobel Laureate Lord Rayleigh best summarized the state of affairs in 1894, stating 'the problem has, for the most part, resisted attack'. More recently, modern computers and electronics have enabled Anderson and co-workers, with their work on minerals, and our work at Los Alamos on new materials and manufactured components, to advance the use of resonances to a precision non-destructive testing tool that makes anisotropic modulus measurements, defect detection and geometry error detection routine. The result is that resonances can achieve the highest absolute accuracy for any routine dynamic modulus measurement technique, can be used on the smallest samples, and can also enable detection of errors in certain classes of precision manufactured components faster and more accurately than any other technique. RP Migliori, A (reprint author), LOS ALAMOS NATL LAB,MS K764,LOS ALAMOS,NM 87545, USA. RI CHEN, Jiangang/A-1549-2011 NR 7 TC 30 Z9 31 U1 0 U2 8 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0041-624X J9 ULTRASONICS JI Ultrasonics PD JUN PY 1996 VL 34 IS 2-5 BP 473 EP 476 DI 10.1016/0041-624X(95)00120-R PG 4 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA UZ889 UT WOS:A1996UZ88900077 ER PT J AU Welch, KM AF Welch, KM TI Acquisition of reliable vacuum hardware for large accelerator systems SO VACUUM LA English DT Article; Proceedings Paper CT 13th International Vacuum Congress/9th International Conference on Solid Surfaces (IVC-13/ICSS-9) CY SEP 25-29, 1995 CL YOKOHAMA, JAPAN AB Credible and effective communications prove to be the major challenge in the acquisition of reliable vacuum hardware. Technical competence is necessary but not sufficient We must effectively communicate with management, sponsoring agencies, project organizations, service groups, staff and with vendors. Most of Deming's 14 quality assurance tenants relate to creating an enlightened environment of good communications. All projects progress along six distinct, closely coupled, dynamic phases; all six phases are in a state of perpetual change. These phases and their elements are discussed, with emphasis given to the acquisition phase and its related vocabulary Large projects require great clarity and rigor as poor communications Can be costly. For rigor to be cost effective, it cannot be pedantic. Clarity thrives best in a low-risk, team environment. Copyright (C) 1996 Elsevier Science Ltd. RP Welch, KM (reprint author), BROOKHAVEN NATL LAB,RELATIVIST HEAVY ION COLLIDER PROJECT,UPTON,NY 11973, 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, ENGLAND OX5 1GB SN 0042-207X J9 VACUUM JI Vacuum PD JUN-AUG PY 1996 VL 47 IS 6-8 BP 485 EP 492 DI 10.1016/0042-207X(96)00005-X PG 8 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA UV262 UT WOS:A1996UV26200004 ER PT J AU Spokas, KA Bogner, JE AF Spokas, KA Bogner, JE TI Field system for continuous measurement of landfill gas pressures and temperatures SO WASTE MANAGEMENT & RESEARCH LA English DT Article DE landfill; data acquisition; pressure; temperature; monitoring system; network; continuous measurement; landfill gas ID DATA ACQUISITION-SYSTEM; INSTRUMENTATION; COMPUTER AB The driving forces for gas movement in the subsurface include both concentration gradients (diffusion) and pressure gradients (convection). Near the top of the landfill, small soil gas pressure differences with respect to atmospheric pressure have been typically disregarded but may be important to considerations of gas flux into and out of landfill cover materials. The authors have developed a portable, inexpensive system using off-the-shelf components to sensitively monitor pressures, temperatures and meteorological variables on a continuous basis. Previous experience has indicated that continuous monitoring of pressure changes is necessary to understand the dynamics of convection in the shallow subsurface. This application relies on a distributed network of commercially available Z-180 microprocessor-based integrated controllers to condition signals from electronic pressure transducers, meteorological sensors, and various temperature-sensing devices: thermocouples, thermistors and resistance temperature detectors (RTDs). Output is recorded continuously over an Appletalk(TM) network. The sensitivity of the authors' current system exceeds 4 Pa for pressure and 0.01 degrees C for temperature (thermistor sensors). This paper will describe the basic system components. The various choices for both temperature and pressure sensors will be discussed with respect to their sensitivity, adaptability and resolution. In addition, sample data output will be presented to illustrate the dynamics of shallow subsurface pressure and temperature changes. (C) 1996 ISWA. RP Spokas, KA (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Spokas, Kurt/F-4839-2016 OI Spokas, Kurt/0000-0002-5049-5959 NR 10 TC 1 Z9 1 U1 1 U2 8 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0734-242X J9 WASTE MANAGE RES JI Waste Manage. Res. PD JUN PY 1996 VL 14 IS 3 BP 233 EP 242 PG 10 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA UP564 UT WOS:A1996UP56400002 ER PT J AU Tyler, SW Chapman, JB Conrad, SH Hammermeister, DP Blout, DO Miller, JJ Sully, MJ Ginanni, JM AF Tyler, SW Chapman, JB Conrad, SH Hammermeister, DP Blout, DO Miller, JJ Sully, MJ Ginanni, JM TI Soil-water flux in the southern Great Basin, United States: Temporal and spatial variations over the last 120,000 years SO WATER RESOURCES RESEARCH LA English DT Article ID DESERT SOILS; UNSATURATED ZONE; STABLE ISOTOPE; VEIN CALCITE; NEVADA; CHLORIDE; RECHARGE; MOVEMENT; TRITIUM; PRECIPITATION AB The disposal of hazardous and radioactive waste in arid regions requires a thorough understanding of the occurrence of soil-water flux and recharge. Soil-water chemistry and isotopic data are presented from three deep vadose zone boreholes (>230 m) at the Nevada Test Site, located in the Great Basin geographic province of the southwestern United States, to quantify soil-water flux and its relation to climate. The low water contents found in the soils significantly reduce the mixing of tracers in the subsurface and provide a unique opportunity to examine the role of climate variation on recharge in arid climate. Tracing techniques and core data are examined in this work to reconstruct the paleohydrologic conditions existing in the vadose zone well beyond the timescales typically investigated, Stable chloride and chlorine 36 profiles indicate that the soil waters deep in the vadose zone range in age from approximately 20,000 to 120,000 years. Secondary chloride bulges that are present in two of the three profiles support the concept of recharge occurring at or near the last two glacial maxima, when the climate of the area was considerably wetter and cooler. The stable isotopic composition of the soil water in the profiles is significantly more depleted in heavy isotopes than is modern precipitation, suggesting that recharge under the current climate is not occurring at this arid site. Past and present recharge appears to have been strongly controlled by surface topography, with increased incidence of recharge where runoff from the surrounding mountains may have been concentrated. The data obtained from this detailed drilling and sampling program shed new light on the behavior of water in thick vadose zones and, in particular, show the sensitivity of arid regions to the extreme variations in climate experienced by the region over the last two glacial maxima. C1 DESERT RES INST,WATER RESOURCES CTR,LAS VEGAS,NV 89132. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV NEVADA,DEPT ENVIRONM & RESOURCE SCI,RENO,NV 89557. RP Tyler, SW (reprint author), UNIV NEVADA,DESERT RES INST,WATER RESOURCES CTR,POB 60220,RENO,NV 89506, USA. NR 66 TC 95 Z9 101 U1 2 U2 15 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUN PY 1996 VL 32 IS 6 BP 1481 EP 1499 DI 10.1029/96WR00564 PG 19 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA UN704 UT WOS:A1996UN70400001 ER PT J AU Cook, PG Solomon, DK Sanford, WE Busenberg, E Plummer, LN Poreda, RJ AF Cook, PG Solomon, DK Sanford, WE Busenberg, E Plummer, LN Poreda, RJ TI Inferring shallow groundwater flow in saprolite and fractured rock using environmental tracers SO WATER RESOURCES RESEARCH LA English DT Article ID CONTAMINANT TRANSPORT; CHLOROFLUOROCARBON-11; CCL2F2; SYSTEM; SOLUTE; CCL3F; MEDIA; WATER; TILL AB The Ridge and Valley Province of eastern Tennessee is characterized by (1) substantial topographic relief, (2) folded and highly fractured rocks of various lithologies that have low primary permeability and porosity, and (3) a shallow residuum of medium permeability and high total porosity. Conceptual models of shallow groundwater flow and solute transport in this system have been developed but are difficult to evaluate using physical characterization or short-term tracer methods due to extreme spatial variability in hydraulic properties. In this paper we describe how chlorofluorocarbon 12, H-3, and He-3 were used to infer groundwater flow and solute transport in saprolite and fractured rock near Oak Ridge, Tennessee. In the shallow residuum, fracture spacings are <0.05 m, suggesting that concentrations of these tracers in fractures and in the matrix have time to diffusionally equilibrate. The relatively smooth nature of tracer concentrations with depth in the residuum is consistent with this model and quantitatively suggests recharge fluxes of 0.2 to 0.4 m yr(-1). In contrast, groundwater flow within the unweathered rock appears to be controlled by fractures with spacings of the order of 2 to 5 m, and diffusional equilibration of fractures and matrix has not occurred. For this reason, vertical fluid fluxes in the unweathered rock cannot be estimated from the tracer data. C1 US GEOL SURVEY,RESTON,VA 22092. UNIV ROCHESTER,DEPT GEOL SCI,ROCHESTER,NY 14627. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI Cook, Peter/H-3606-2011; Sanford, William/F-7380-2016; Solomon, Douglas/C-7951-2016; OI Sanford, William/0000-0001-9085-1367; Solomon, Douglas/0000-0001-6370-7124; Plummer, L. Niel/0000-0002-4020-1013 NR 43 TC 55 Z9 55 U1 4 U2 22 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUN PY 1996 VL 32 IS 6 BP 1501 EP 1509 DI 10.1029/96WR00354 PG 9 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA UN704 UT WOS:A1996UN70400002 ER PT J AU Sanford, WE Shropshire, RG Solomon, DK AF Sanford, WE Shropshire, RG Solomon, DK TI Dissolved gas tracers in groundwater: Simplified injection, sampling, and analysis SO WATER RESOURCES RESEARCH LA English DT Article ID WATER; SOLUBILITY; SEAWATER; MEDIA AB Simplified injection, sampling, and analytical procedures using dissolved gases as groundwater tracers are presented for use in saturated conditions at both the laboratory and field scales. The injection of gases into the groundwater is accomplished by allowing the gas to diffuse through semipermeable tubing, minimizing the formation of bubbles that could modify the hydraulic properties around the well. We have simplified the collection of dissolved gases by developing a passive in situ headspace-sampler the employs a semipermeable membrane and copper tubing equipped with a schrader valve. The headspace within the sampler equilibrates with the dissolved gases in the groundwater in around 24 hours, and no groundwater is collected, which is of great advantage for use in contaminated sites. The design parameters and the time to equilibrium of the headspace sampler can be adjusted for investigation requirements using the analytical equation presented. The analysis of the gases for tracer content is performed by using a common gas chromatograph fitted with a thermal conductivity detector. Examples of the use of these methods at both the laboratory and field scales are presented. C1 UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES,WATERLOO,ON N2L 3G1,CANADA. UNIV UTAH,DEPT GEOL & GEOPHYS,SCH MINES,SALT LAKE CITY,UT 84112. UNIV TENNESSEE,DEPT CIVIL & ENVIRONM ENGN,KNOXVILLE,TN. RP Sanford, WE (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,MAIL STOP 6400,OAK RIDGE,TN 37831, USA. RI Sanford, William/F-7380-2016; Solomon, Douglas/C-7951-2016 OI Sanford, William/0000-0001-9085-1367; Solomon, Douglas/0000-0001-6370-7124 NR 28 TC 66 Z9 66 U1 3 U2 14 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUN PY 1996 VL 32 IS 6 BP 1635 EP 1642 DI 10.1029/96WR00599 PG 8 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA UN704 UT WOS:A1996UN70400013 ER PT J AU Jang, DY Watkins, TR Kozaczek, KJ Hubbard, CR Cavin, OB AF Jang, DY Watkins, TR Kozaczek, KJ Hubbard, CR Cavin, OB TI Surface residual stresses in machined austenitic stainless steel SO WEAR LA English DT Article DE stainless steel; machining; residual stress; X-ray diffraction; surface; machinability AB Surface residual stresses due ro turning operations in AISI 304 type stainless steel were studied as a function of machining speed, feed rate, depth of cut, and tool geometry and coating. Residual stress tensors were determined using X-ray diffraction technique, The: effects of turning conditions and tool on the residual stresses were discussed in terms of mechanically and thermally induced non-homogeneous plastic deformation of thr surface layers of the workplace. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP Jang, DY (reprint author), UNIV MISSOURI,DEPT MECH & AEROSP ENGN,COLUMBIA,MO 65211, USA. RI Watkins, Thomas/D-8750-2016 OI Watkins, Thomas/0000-0002-2646-1329 NR 16 TC 61 Z9 64 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD JUN PY 1996 VL 194 IS 1-2 BP 168 EP 173 DI 10.1016/0043-1648(95)06838-4 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA UQ986 UT WOS:A1996UQ98600022 ER PT J AU Abreu, P Adam, W Adye, T Agasi, E Ajinenko, I Aleksan, R Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, ML Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barate, R Barbi, M Barbiellini, G Bardin, DY Baroncelli, A Barring, O Barrio, JA Bartl, W Bates, MJ Battaglia, M Baubillier, M Baudot, J Becks, KH Begalli, M Beilliere, P Belokopytov, Y Benvenuti, AC Berggren, M Bertrand, D Bianchi, F Bigi, M Bilenky, MS Billoir, P Bloch, D Blume, M Blyth, S Bolognese, T Bonesini, M Bonivento, W Booth, PSL Borisov, G Bosio, C Bosworth, S Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Bozzo, M Branchini, P Brand, KD Brenke, T Brenner, RA Bricman, C Brillault, L Brown, RCA Bruckman, P Brunet, JM Bugge, L Buran, T Burgsmueller, T Buschmann, P Buys, A Cabrera, S Caccia, M Calvi, M Rozas, AJC Camporesi, T Canale, V Canepa, M Cankocak, K Cao, F Carena, F Carroll, L Caso, C Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Chabaud, V Chapkin, M Charpentier, P Chaussard, L Chauveau, J Checchia, P Chelkov, GA Chen, M Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudova, J Cindro, V Collins, P Contreras, JL Contri, R Cortina, E Cosme, G Cossutti, B Crawley, HB Crennell, D Crosetti, G Maestro, JC Czellar, S DahlJensen, E Dahm, J Dalmagne, B Dam, M Damgaard, G Dauncey, PD Davenport, M DaSilva, W Defoix, C Deghorain, A DellaRicca, G Delpierre, P Demaria, N DeAngelis, A DeBoer, W DeBrabandere, S DeClercq, C DeLaVaissiere, C DeLotto, B DeMin, A DePaula, L DeSaintJean, C Dijkstra, H DiCiaccio, L Djama, F Dolbeau, J Donszelmann, M Doroba, K Dracos, M Drees, J Drees, KA Dris, M Edsall, D Ehret, R Eigen, G Ekelof, T Ekspong, G Elsing, M Engel, JP Ershaidat, N Erzen, B Santo, ME Falk, E Fassouliotis, D Feindt, M Fenyuk, A Ferrer, A Filippas, TA Firestone, A Fischer, PA Foeth, H Fokitis, E Fontanelli, F Formenti, F Franek, B Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R FuldaQuenzer, F Fuster, J Galloni, A Gamba, D Gandelman, M Garcia, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gibbs, M Gokieli, R Golob, B Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Graziani, E Grosdidier, G Grzelak, K Gumenyuk, S Gunnarsson, P Gunther, M Guy, J Hahn, F Hahn, S Hajduk, Z Hallgren, A Hamacher, K Hao, W Harris, FJ Hedberg, V Henriques, R Hernandez, JJ Herquet, P Herr, H Hessing, TL Higon, E Hilke, HJ Hill, TS Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P JeanMarie, B Johansson, EK Jonsson, L Jonsson, P Joram, C Juillot, P Kaiser, M Kapusta, F Karafasoulis, K Karlsson, M Karvelas, E Katsanevas, S Katsoufis, EC Keranen, R Khomenko, BA Khovanski, NN King, B Kjaer, NJ Klein, H Klovning, A Kluit, P Koene, B Kokkinias, P Koratzinos, M Korcyl, K Kostioukhine, V Kourkoumelis, C Kouznetsov, O Kramer, PH Krammer, M Kreuter, C Kronkvist, I Krumstein, Z Krupinski, W Kubinec, P Kucewicz, W Kurvinen, K Lacasta, C Laktineh, I Lamblot, S Lamsa, JW Lanceri, L Lane, DW Langefeld, P Lapin, V Last, I Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Legan, CK Leitner, R Lemoigne, Y Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Liko, D Lindner, R Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J Maehlum, G Maio, A Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Maron, T MartinezRivero, C MartinezVidal, F Garcia, SMI Masik, J Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R McNulty, R Medbo, J Merk, M Meroni, C Meyer, S Meyer, WT Michelotto, M Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Mundim, LM Murray, WJ Muryn, B Myatt, G Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Neumann, W Neumeister, N Nicolaidou, R Nielsen, BS Nieuwenhuizen, M Nikolaenko, V Niss, P Nomerotski, A Normand, A Novak, M OberschulteBeckmann, W Obraztsov, V Olshevski, AG Onofre, A Orava, R Ostankov, A Osterberg, K Ouraou, A Paganini, P Paganoni, M Pages, P Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Passeri, A Pegoraro, M Pernegger, H Pernicka, M Perrotta, A Petridou, C Petrolini, A Petrovyck, M Phillips, HT Piana, G Pierre, F Pimenta, M Pindo, M Plaszczynski, S Podobrin, O Pol, ME Polok, G Poropat, P Pozdniakov, V Prest, M Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H 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D Trischuk, W Tristram, G Trombini, A Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tyndel, M Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E VanderVelde, C VanApeldoorn, GW VanDam, P VanDoninck, WK VanEldik, J Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Vilanova, D Vincent, P Vitale, L Vlasov, E Vodopyanov, AS Vrba, V Wahlen, H Walck, C Weierstall, M Weilhammer, P Weiser, C Wetherell, AM Wicke, D Wickens, JH Wielers, M Wilkinson, GR Williams, WSC Winter, M Witek, M Woschnagg, K Yip, K Zach, F Zaitsev, A Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zito, M Zontar, D Zuberi, R Zucchelli, GC Zumerle, G AF Abreu, P Adam, W Adye, T Agasi, E Ajinenko, I Aleksan, R Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, ML Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barate, R Barbi, M Barbiellini, G Bardin, DY Baroncelli, A 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S DahlJensen, E Dahm, J Dalmagne, B Dam, M Damgaard, G Dauncey, PD Davenport, M DaSilva, W Defoix, C Deghorain, A DellaRicca, G Delpierre, P Demaria, N DeAngelis, A DeBoer, W DeBrabandere, S DeClercq, C DeLaVaissiere, C DeLotto, B DeMin, A DePaula, L DeSaintJean, C Dijkstra, H DiCiaccio, L Djama, F Dolbeau, J Donszelmann, M Doroba, K Dracos, M Drees, J Drees, KA Dris, M Edsall, D Ehret, R Eigen, G Ekelof, T Ekspong, G Elsing, M Engel, JP Ershaidat, N Erzen, B Santo, ME Falk, E Fassouliotis, D Feindt, M Fenyuk, A Ferrer, A Filippas, TA Firestone, A Fischer, PA Foeth, H Fokitis, E Fontanelli, F Formenti, F Franek, B Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R FuldaQuenzer, F Fuster, J Galloni, A Gamba, D Gandelman, M Garcia, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gibbs, M Gokieli, R Golob, B Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Graziani, E Grosdidier, G Grzelak, K Gumenyuk, S Gunnarsson, P Gunther, M Guy, J Hahn, F Hahn, S Hajduk, Z Hallgren, A Hamacher, K Hao, W Harris, FJ Hedberg, V Henriques, R Hernandez, JJ Herquet, P Herr, H Hessing, TL Higon, E Hilke, HJ Hill, TS Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P JeanMarie, B Johansson, EK Jonsson, L Jonsson, P Joram, C Juillot, P Kaiser, M Kapusta, F Karafasoulis, K Karlsson, M Karvelas, E Katsanevas, S Katsoufis, EC Keranen, R Khomenko, BA Khovanski, NN King, B Kjaer, NJ Klein, H Klovning, A Kluit, P Koene, B Kokkinias, P Koratzinos, M Korcyl, K Kostioukhine, V Kourkoumelis, C Kouznetsov, O Kramer, PH Krammer, M Kreuter, C Kronkvist, I Krumstein, Z Krupinski, W Kubinec, P Kucewicz, W Kurvinen, K Lacasta, C Laktineh, I Lamblot, S Lamsa, JW Lanceri, L Lane, DW Langefeld, P Lapin, V Last, I Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Legan, CK Leitner, R Lemoigne, Y Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Liko, D Lindner, R Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J Maehlum, G Maio, A Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Maron, T MartinezRivero, C MartinezVidal, F Garcia, SMI Masik, J Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R McNulty, R Medbo, J Merk, M Meroni, C Meyer, S Meyer, WT Michelotto, M Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Mundim, LM Murray, WJ Muryn, B Myatt, G Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Neumann, W Neumeister, N Nicolaidou, R Nielsen, BS Nieuwenhuizen, M Nikolaenko, V Niss, P Nomerotski, A Normand, A Novak, M OberschulteBeckmann, W Obraztsov, V Olshevski, AG Onofre, A Orava, R Ostankov, A Osterberg, K Ouraou, A Paganini, P Paganoni, M Pages, P Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Passeri, A Pegoraro, M Pernegger, H Pernicka, M Perrotta, A Petridou, C Petrolini, A Petrovyck, M Phillips, HT Piana, G Pierre, F Pimenta, M Pindo, M Plaszczynski, S Podobrin, O Pol, ME Polok, G Poropat, P Pozdniakov, V Prest, M Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Ratoff, PN Read, AL Reale, M Rebecchi, P Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, J Ridky, J Rinaudo, G Ripp, I Romero, A Roncagliolo, I Ronchese, P Ross, L Rosenberg, EI Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W RuhlmannKleider, V Ruiz, A Rybicki, K Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sanchez, J Sannino, M Schimmelpfennig, M Schneider, H Schwickerath, U Schyns, MAE Sciolla, G Scuri, F Seager, P Sedykh, Y Segar, AM Seitz, A Sekulin, R Shellard, RC Siccama, I Siegrist, P Simonetti, S Simonetto, F Sisakian, AN Sitar, B Skaali, TB Smadja, G Smirnov, N Smirnova, O Smith, GR Sosnowski, R SouzaSantos, D Spassov, T Spiriti, E Sponholz, P Squarcia, S Stanescu, C Stapnes, S Stavitski, I Stichelbaut, F Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Tavernet, JP Tchikilev, O Tilquin, A Timmermans, J Tkatchev, LG Todorov, T Todorova, S Toet, DZ Tomaradze, A Tome, B Tonazzo, A Tortora, L Transtromer, G Treille, D Trischuk, W Tristram, G Trombini, A Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tyndel, M Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E VanderVelde, C VanApeldoorn, GW VanDam, P VanDoninck, WK VanEldik, J Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Vilanova, D Vincent, P Vitale, L Vlasov, E Vodopyanov, AS Vrba, V Wahlen, H Walck, C Weierstall, M Weilhammer, P Weiser, C Wetherell, AM Wicke, D Wickens, JH Wielers, M Wilkinson, GR Williams, WSC Winter, M Witek, M Woschnagg, K Yip, K Zach, F Zaitsev, A Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zito, M Zontar, D Zuberi, R Zucchelli, GC Zumerle, G TI Mean lifetime of the B-s(0) meson SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; Z(0) DECAYS; E+E; ASYMMETRY; PHYSICS; DELPHI; C+ AB This paper presents an update of the measurement of the mean lifetime of the B-s(0) meson. Combining D-s - l, D-s - h, phi - l and inclusive D-s final states from the 3.2 million hadronic Z decays collected by DELPHI between 1991 and 1994, the B-s(0) mean lifetime was measured to be: tau(B-s(0)) = 1.67 +/- 0.14 ps. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,SK-84215 BRATISLAVA,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. DEMOKRITOS NATL CTR SCI RES,INST PHYS NUCL,GR-15310 ATHENS,GREECE. FZU,CAS,INST PHYS,DIV HIGH ENERGY PHYS,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DEPT PHYS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 ST MARTIN DHERES,FRANCE. SEFT,FIN-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,PL-30055 KRAKOW,POLAND. UNIV MIN & MET KRAKOW,PL-30055 KRAKOW,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,INPL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,NC,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UC,CSIC,INST FIS CANTABRIA,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,MOSCOW REGION,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,SI-61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,SI-61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,ILHA FDN,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,VALENCIA CSIC,IFIC,E-46100 BURJASSOT,VALENCIA,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,VALENCIA,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL,GERMANY. RP Abreu, P (reprint author), LIP,IST,FCUL,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; de Paula, Leandro/I-9278-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Cabrera Urban, Susana/H-1376-2015; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Michelotto, Michele/A-9571-2013; Mundim, Luiz/A-1291-2012; Yip, Kin/D-6860-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Navas, Sergio/N-4649-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI Lacasta, Carlos/0000-0002-2623-6252; Demaria, Natale/0000-0003-0743-9465; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; de Paula, Leandro/0000-0002-4984-7734; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Ragazzi, Stefano/0000-0001-8219-2074; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Dracos, Marcos/0000-0003-0514-193X; Michelotto, Michele/0000-0001-6644-987X; Mundim, Luiz/0000-0001-9964-7805; Yip, Kin/0000-0002-8576-4311; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Navas, Sergio/0000-0003-1688-5758; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389 NR 42 TC 11 Z9 11 U1 0 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1996 VL 71 IS 1 BP 11 EP 30 DI 10.1007/s002880050144 PG 20 WC Physics, Particles & Fields SC Physics GA UV838 UT WOS:A1996UV83800002 ER PT J AU Adiasevich, BP Antonenko, VG Averichev, SA Azhgirey, LS Ball, J Bazhanov, NA Benda, B Borisov, NS Borzunov, YT Bunyatova, EI Burinov, VF Chernykh, EV Dolgii, SA Durand, G Dzyubak, AP Fedorov, AN Fimushkin, VV Fontaine, JM Glagolev, VV Golovanov, LB Grosnick, DP Gurevich, GM Hill, DA Karpunin, AV Kasprzyk, TE Khachaturov, BA Kirillov, AD Kochelev, NI Kovalenko, AD Kovalev, AI Kulikov, MV Ladygin, VP Lazarev, AB Lehar, F deLesquen, A Liburg, MY Lopiano, D Lukhanin, AA Maniakov, PK Matafonov, VN Matyushevsky, EA Mgebrishvili, G Mironov, SV Neganov, AB Nikolaevsky, GP Nomofilov, AA Pilipenko, YK Pisarev, IL Piskunov, NM Plis, YA Polunin, YP Polyakov, VV Prokofiev, AN Ronzhin, DA Rukoyatkin, PA Sans, JL Sharov, VI Shilov, SN Shishov, YA Shutov, VB Sorokin, PV Spinka, HM Starikov, AY Stoletov, GD Strokovsky, EA Strunov, LN Svetov, AL Teterin, VV Topalov, SV Trautman, VY Tsvinev, AP Usov, YA Vikhrov, VV Volkov, VI Yershov, AA Yershov, VP Zaporozhets, SA Zhdanov, AA AF Adiasevich, BP Antonenko, VG Averichev, SA Azhgirey, LS Ball, J Bazhanov, NA Benda, B Borisov, NS Borzunov, YT Bunyatova, EI Burinov, VF Chernykh, EV Dolgii, SA Durand, G Dzyubak, AP Fedorov, AN Fimushkin, VV Fontaine, JM Glagolev, VV Golovanov, LB Grosnick, DP Gurevich, GM Hill, DA Karpunin, AV Kasprzyk, TE Khachaturov, BA Kirillov, AD Kochelev, NI Kovalenko, AD Kovalev, AI Kulikov, MV Ladygin, VP Lazarev, AB Lehar, F deLesquen, A Liburg, MY Lopiano, D Lukhanin, AA Maniakov, PK Matafonov, VN Matyushevsky, EA Mgebrishvili, G Mironov, SV Neganov, AB Nikolaevsky, GP Nomofilov, AA Pilipenko, YK Pisarev, IL Piskunov, NM Plis, YA Polunin, YP Polyakov, VV Prokofiev, AN Ronzhin, DA Rukoyatkin, PA Sans, JL Sharov, VI Shilov, SN Shishov, YA Shutov, VB Sorokin, PV Spinka, HM Starikov, AY Stoletov, GD Strokovsky, EA Strunov, LN Svetov, AL Teterin, VV Topalov, SV Trautman, VY Tsvinev, AP Usov, YA Vikhrov, VV Volkov, VI Yershov, AA Yershov, VP Zaporozhets, SA Zhdanov, AA TI Measurement of the total cross section difference Delta sigma(L) in np transmission at 1.19, 2.49 and 3.65 GeV SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID DELTA-SIGMA-L; ISOVECTOR DIBARYON RESONANCE; NUCLEON ELASTIC-SCATTERING; STRONG ENERGY-DEPENDENCE; PP->D-PI+ REACTION; BEAM POLARIZATION; ANALYZING POWERS; SPIN; PREDICTIONS; QUESTION AB Results of the total cross section difference Delta sigma(L) in a np transmission experiment at 1.19, 2.49 and 3.65 GeV incident neutron beam kinetic energies are presented. Measurements were performed at the Synchrophasotron of the Laboratory of High Energies of the Joint Institute for Nuclear Research in Dubna. Results were obtained with a polarized beam of free quasi-monochromatic neutrons passing through the new Dubna frozen spin proton target. The beam and target polarizations were oriented longitudinally. The present results were obtained at the highest energies of free polarized neutrons that can be reached at present. They extend the energy range of existing results from PSI, LAMPF and Saclay measured between 0.066 and 1.10 GeV. The new results are compared with Delta sigma(L)(pn) data determined as a difference between Delta sigma(L)(pd) and Delta sigma L(L)(pp) ANL-ZGS measurements. The values of Delta sigma(L) for the isospin state I = 0 were deduced using known pp data. C1 JOINT INST NUCL RES,LAB HIGH ENERGIES,DUBNA 141980,RUSSIA. JOINT INST NUCL RES,LAB NUCL PROBLEMS,DUBNA 141980,RUSSIA. CTR ETUD SACLAY,CEA,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,CEA,DSM,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,LAB NATL SATURNE,CNRS,IN2P3,F-91191 GIF SUR YVETTE,FRANCE. PETERSBURG NUCL PHYS INST,GATCHINA 188350,RUSSIA. KHARKOV PHYS & TECHNOL INST,KHARKOV 310108,UKRAINE. JOINT INST NUCL RES,LAB PARTICLE PHYS,DUBNA 141980,RUSSIA. ARGONNE NATL LAB,HEP,ARGONNE,IL 60439. RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW 117312,RUSSIA. JOINT INST NUCL RES,THEORET PHYS LAB,DUBNA 141980,RUSSIA. MOSCOW MV LOMONOSOV STATE UNIV,INST NUCL PHYS,MOSCOW 119899,RUSSIA. RP Adiasevich, BP (reprint author), IV KURCHATOV ATOM ENERGY INST,KURCHATOVA STR 46,MOSCOW 123182,RUSSIA. NR 51 TC 29 Z9 30 U1 0 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1996 VL 71 IS 1 BP 65 EP 74 DI 10.1007/s002880050148 PG 10 WC Physics, Particles & Fields SC Physics GA UV838 UT WOS:A1996UV83800006 ER PT J AU Chu, CS Ho, PM Steinacker, H AF Chu, CS Ho, PM Steinacker, H TI q-Deformed Dirac monopole with arbitrary charge SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID COMPACT MATRIX PSEUDOGROUPS; DIFFERENTIAL-CALCULUS; QUANTUM AB We construct the deformed Dirac monopoles on the quantum sphere by giving a global description for arbitrary integer charge n and alternatively by glueing trivial bundles for even n, and show that they are quantum principal bundles in the sense of Brzezinski and Majid. We also give connections and calculate the analog of Chern numbers by integrating the curvature over S-q(2). C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP Chu, CS (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Chu, chong-sun/J-8842-2012; OI Steinacker, Harold/0000-0002-3440-8827; Ho, Pei-Ming/0000-0002-0466-0351 NR 10 TC 1 Z9 1 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1996 VL 71 IS 1 BP 171 EP 177 DI 10.1007/s002880050161 PG 7 WC Physics, Particles & Fields SC Physics GA UV838 UT WOS:A1996UV83800019 ER PT J AU Sorge, H AF Sorge, H TI Mass dependence of hadron distributions in ultrarelativistic nucleus-nucleus collisions (vol C 67, pg 479, 1995) SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Correction, Addition C1 UNIV FRANKFURT,D-60054 FRANKFURT,GERMANY. RP Sorge, H (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1996 VL 71 IS 1 BP 178 EP 178 DI 10.1007/s002880050162 PG 1 WC Physics, Particles & Fields SC Physics GA UV838 UT WOS:A1996UV83800020 ER PT J AU Abreu, P Adam, W Adye, T Agasi, E Ajinenko, I Aleksan, R Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, ML Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barate, R Barbi, M Bardin, DY Baroncelli, A Barring, O Barrio, JA Bartl, W Bates, MJ Battaglia, M Baubillier, M Baudot, J Becks, KH Begalli, M Beilliere, P Belokopytov, Y Belous, K Benvenuti, AC Berggren, M Bertrand, D Bianchi, F Bigi, M Bilenky, MS Billoir, P Bloch, D Blume, M Blyth, S Bolognese, T Bonesini, M Bonivento, W Booth, PSL Borisov, G Bosio, C Bosworth, S Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Bozzo, M Branchini, P Brand, KD Brenke, T Brenner, RA Bricman, C Brillault, L Brown, RCA Bruckman, P Brunet, JM Bugge, L Buran, T Burgsmueller, T Buschmann, P Buys, A Cabrera, S Caccia, M Calvi, M Rozas, AJC Camporesi, T Canale, V Canepa, M Cankocak, K Cao, F Carena, F Carroll, L Caso, C Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Chabaud, V Chapkin, M Charpentier, P Chaussard, L Chauveau, J Checchia, P Chelkov, GA Chen, M Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudoba, J Cindro, V Collins, P Contreras, JL Contri, R Cortina, E Cosme, G Cossutti, F Crawley, HB Crennell, D Crosetti, G Maestro, JC Czellar, S DahlJensen, E Dahm, J Dalmagne, B Dam, M Damgaard, G Dauncey, PD Davenport, M DaSilva, W Defoix, C Deghorain, A DellaRicca, G Delpierre, P Demaria, N DeAngelis, A DeBoer, W DeBrabandere, S DeClercq, C DeLaVaissiere, C DeLotto, B DeMin, A DePaula, L DeSaintJean, C Dijkstra, H DiCiaccio, L Djama, F Dolbeau, J Donszelmann, M Doroba, K Dracos, M Drees, J Drees, KA Dris, M Dufour, Y Edsall, D Ehret, R Eigen, G Ekelof, T Ekspong, G Elsing, M Engel, JP Ershaidat, N Erzen, B Falk, E Fassouliotis, D Feindt, M Ferrer, A Filippas, TA Firestone, A Fischer, PA Foeth, H Fokitis, E Fontanelli, F Formenti, F Franek, B Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R FuldaQuenzer, F Fuster, J Galloni, A Gamba, D Gandelman, M Garcia, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gerdyukov, L Gibbs, M Gokieli, R Golob, B Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Graziani, E Grosdidier, G Grzelak, K Gumenyuk, S Gunnarsson, P Gunther, M Guy, J Hahn, F Hahn, S Hajduk, Z Hallgren, A Hamacher, K Hao, W Harris, FJ Hedberg, V Henriques, R Hernandez, JJ Herquet, P Herr, H Hessing, TL Higon, E Hilke, HJ Hill, TS Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Hrubec, J Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P JeanMarie, B Johansson, EK Jonsson, L Jonsson, P Joram, C Juillot, P Kaiser, M Kapusta, F Karafasoulis, K Karlsson, M Karvelas, E Katsanevas, S Katsoufis, EC Keranen, R Khokhlov, Y Khomenko, BA Khovanski, NN King, B Kjaer, NJ Klein, H Klovning, A Kluit, P Koene, B Kokkinias, P Koratzinos, M Korcyl, K Kourkoumelis, C Kouznetsov, O Kramer, PH Krammer, M Kreuter, C Kronkvist, I Krumstein, Z Krupinski, W Kubinec, P Kucewicz, W Kurvinen, K Lacasta, C Laktineh, I Lamblot, S Lamsa, JW Lanceri, L Lane, DW Langefeld, P Last, I Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Legan, CK Leitner, R Lemoigne, Y Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Liko, D Lindner, R Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J Maehlum, G Maio, A Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Maron, T MartinezRivero, C MartinezVidal, F Garcia, SMI Masik, J Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R McNulty, R Medbo, J Merk, M Meroni, C Meyer, S Meyer, WT Michelotto, M Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Mundim, LM Murray, WJ Muryn, B Myatt, G Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Nemecek, S Neumann, W Neumeister, N Nicolaidou, R Nielsen, BS Nieuwenhuizen, M Nikolaenko, V Niss, P Nomerotski, A Normand, A OberschulteBeckmann, W Obraztsov, V Olshevski, AG Onofre, A Orava, R Osterberg, K Ouraou, A Paganini, P Paganoni, M Pages, P Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Passeri, A Pegoraro, M Peralta, L Pernegger, H Perrotta, A Petridou, C Petrolini, A Petrovyck, M Phillips, HT Piana, G Pierre, F Pimenta, M Pindo, M Plaszczynski, S Podobrin, O Pol, ME Polok, G Poropat, P Pozdniakov, V Prest, M Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Ratoff, PN Read, AL Reale, M Rebecchi, P Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, J Ridky, J Rinaudo, G Ripp, I Romero, A Roncagliolo, I Ronchese, P Roos, L Rosenberg, EI Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W RuhlmannKleider, V Ruiz, A Rybicki, K Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sanchez, J Sannino, M Schimmelpfennig, M Schneider, H Schwickerath, U Schyns, MAE Sciolla, G Scuri, F Seager, P Sedykh, Y Segar, AM Seitz, A Sekulin, R Shellard, RC Siccama, I Siegrist, P Simonetti, S Simonetto, F Sisakian, AN Sitar, B Skaali, TB Smadja, G Smirnov, N Smirnova, O Smith, GR Solovianov, O Sosnowski, R SouzaSantos, D Spassov, T Spiriti, E Sponholz, P Squarcia, S Stanescu, C Stapnes, S Stavitski, I Stichelbaut, F Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Tavernet, JP Tchikilev, O Tilquin, A Timmermans, J Tkatchev, LG Todorov, T Toet, DZ Tomaradze, A Tome, B Tonazzo, A Tortora, L Transtromer, G Treille, D Trischuk, W Tristram, G Trombini, A Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tyndel, M Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E VanderVelde, C VanApeldoorn, GW VanDam, P VanDoninck, WK VanEldik, J Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Vilanova, D Vincent, P Vitale, L Vlasov, E Vodopyanov, AS Vrba, V Wahlen, H Walck, C Waldner, F Weierstall, M Weilhammer, P Weiser, C Wetherell, AM Wicke, D Wickens, JH Wielers, M Wilkinson, GR Williams, WSC Winter, M Witek, M Woschnagg, K Yip, K Yushchenko, O Zach, F Zaitsev, A Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zito, M Zontar, D Zuberi, R Zucchelli, GC Zumerle, G AF Abreu, P Adam, W Adye, T Agasi, E Ajinenko, I Aleksan, R Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, ML Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barate, R Barbi, M Bardin, DY Baroncelli, A Barring, O Barrio, JA Bartl, W Bates, MJ Battaglia, M Baubillier, M Baudot, J Becks, KH Begalli, M Beilliere, P Belokopytov, Y Belous, K Benvenuti, AC Berggren, M Bertrand, D Bianchi, F Bigi, M Bilenky, MS Billoir, P Bloch, D Blume, M Blyth, S Bolognese, T Bonesini, M Bonivento, W Booth, PSL Borisov, G Bosio, C Bosworth, S Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Bozzo, M Branchini, P Brand, KD Brenke, T Brenner, RA Bricman, C Brillault, L Brown, RCA Bruckman, P Brunet, JM Bugge, L Buran, T Burgsmueller, T Buschmann, P Buys, A Cabrera, S Caccia, M Calvi, M Rozas, AJC Camporesi, T Canale, V Canepa, M Cankocak, K Cao, F Carena, F Carroll, L Caso, C Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Chabaud, V Chapkin, M Charpentier, P Chaussard, L Chauveau, J Checchia, P Chelkov, GA Chen, M Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudoba, J Cindro, V Collins, P Contreras, JL Contri, R Cortina, E Cosme, G Cossutti, F Crawley, HB Crennell, D Crosetti, G Maestro, JC Czellar, S DahlJensen, E Dahm, J Dalmagne, B Dam, M Damgaard, G Dauncey, PD Davenport, M DaSilva, W Defoix, C Deghorain, A DellaRicca, G Delpierre, P Demaria, N DeAngelis, A DeBoer, W DeBrabandere, S DeClercq, C DeLaVaissiere, C DeLotto, B DeMin, A DePaula, L DeSaintJean, C Dijkstra, H DiCiaccio, L Djama, F Dolbeau, J Donszelmann, M Doroba, K Dracos, M Drees, J Drees, KA Dris, M Dufour, Y Edsall, D Ehret, R Eigen, G Ekelof, T Ekspong, G Elsing, M Engel, JP Ershaidat, N Erzen, B Falk, E Fassouliotis, D Feindt, M Ferrer, A Filippas, TA Firestone, A Fischer, PA Foeth, H Fokitis, E Fontanelli, F Formenti, F Franek, B Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R FuldaQuenzer, F Fuster, J Galloni, A Gamba, D Gandelman, M Garcia, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gerdyukov, L Gibbs, M Gokieli, R Golob, B Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Graziani, E Grosdidier, G Grzelak, K Gumenyuk, S Gunnarsson, P Gunther, M Guy, J Hahn, F Hahn, S Hajduk, Z Hallgren, A Hamacher, K Hao, W Harris, FJ Hedberg, V Henriques, R Hernandez, JJ Herquet, P Herr, H Hessing, TL Higon, E Hilke, HJ Hill, TS Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Hrubec, J Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P JeanMarie, B Johansson, EK Jonsson, L Jonsson, P Joram, C Juillot, P Kaiser, M Kapusta, F Karafasoulis, K Karlsson, M Karvelas, E Katsanevas, S Katsoufis, EC Keranen, R Khokhlov, Y Khomenko, BA Khovanski, NN King, B Kjaer, NJ Klein, H Klovning, A Kluit, P Koene, B Kokkinias, P Koratzinos, M Korcyl, K Kourkoumelis, C Kouznetsov, O Kramer, PH Krammer, M Kreuter, C Kronkvist, I Krumstein, Z Krupinski, W Kubinec, P Kucewicz, W Kurvinen, K Lacasta, C Laktineh, I Lamblot, S Lamsa, JW Lanceri, L Lane, DW Langefeld, P Last, I Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Legan, CK Leitner, R Lemoigne, Y Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Liko, D Lindner, R Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J Maehlum, G Maio, A Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Maron, T MartinezRivero, C MartinezVidal, F Garcia, SMI Masik, J Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R McNulty, R Medbo, J Merk, M Meroni, C Meyer, S Meyer, WT Michelotto, M Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Mundim, LM Murray, WJ Muryn, B Myatt, G Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Nemecek, S Neumann, W Neumeister, N Nicolaidou, R Nielsen, BS Nieuwenhuizen, M Nikolaenko, V Niss, P Nomerotski, A Normand, A OberschulteBeckmann, W Obraztsov, V Olshevski, AG Onofre, A Orava, R Osterberg, K Ouraou, A Paganini, P Paganoni, M Pages, P Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Passeri, A Pegoraro, M Peralta, L Pernegger, H Perrotta, A Petridou, C Petrolini, A Petrovyck, M Phillips, HT Piana, G Pierre, F Pimenta, M Pindo, M Plaszczynski, S Podobrin, O Pol, ME Polok, G Poropat, P Pozdniakov, V Prest, M Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Ratoff, PN Read, AL Reale, M Rebecchi, P Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, J Ridky, J Rinaudo, G Ripp, I Romero, A Roncagliolo, I Ronchese, P Roos, L Rosenberg, EI Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W RuhlmannKleider, V Ruiz, A Rybicki, K Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sanchez, J Sannino, M Schimmelpfennig, M Schneider, H Schwickerath, U Schyns, MAE Sciolla, G Scuri, F Seager, P Sedykh, Y Segar, AM Seitz, A Sekulin, R Shellard, RC Siccama, I Siegrist, P Simonetti, S Simonetto, F Sisakian, AN Sitar, B Skaali, TB Smadja, G Smirnov, N Smirnova, O Smith, GR Solovianov, O Sosnowski, R SouzaSantos, D Spassov, T Spiriti, E Sponholz, P Squarcia, S Stanescu, C Stapnes, S Stavitski, I Stichelbaut, F Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Tavernet, JP Tchikilev, O Tilquin, A Timmermans, J Tkatchev, LG Todorov, T Toet, DZ Tomaradze, A Tome, B Tonazzo, A Tortora, L Transtromer, G Treille, D Trischuk, W Tristram, G Trombini, A Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tyndel, M Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E VanderVelde, C VanApeldoorn, GW VanDam, P VanDoninck, WK VanEldik, J Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Vilanova, D Vincent, P Vitale, L Vlasov, E Vodopyanov, AS Vrba, V Wahlen, H Walck, C Waldner, F Weierstall, M Weilhammer, P Weiser, C Wetherell, AM Wicke, D Wickens, JH Wielers, M Wilkinson, GR Williams, WSC Winter, M Witek, M Woschnagg, K Yip, K Yushchenko, O Zach, F Zaitsev, A Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zito, M Zontar, D Zuberi, R Zucchelli, GC Zumerle, G TI Determination of the average lifetime of b-baryons SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; HEAVY MESONS; E+E-PHYSICS; LAMBDA-B; Z-DECAYS; LEP AB The average lifetime of b-baryons has been studied using 3 x 10(6) hadronic Z(0) decays collected by the DELPHI detector at LEP. Three methods have been used, based on the measurement of different observables: the proper decay time distribution of 206 vertices reconstructed with a Lambda, a lepton and an oppositely charged pion; the impact parameter distribution of 441 muons with high transverse momentum accompanied by a Lambda in the same jet; and the proper decay time distribution of 125 Lambda(c)-lepton decay vertices with the Lambda(c) exclusively reconstructed through its pK pi, pK(0) and Lambda 3 pi decay modes. The combined result is: [GRAPHICS] where the first systematic error is due to experimental uncertainties and the second to the uncertainties in the modelling of the b-baryon production and semi-leptonic decay, Including the measurement recently published by DELPHI based on a sample of proton-muon vertices, the average b-baryon lifetime is: [GRAPHICS] [GRAPHICS] C1 IOWA STATE UNIV,AMES LAB,AMES,IA 50011. IOWA STATE UNIV,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VUB,IIHE,ULB,B-1050 BRUSSELS,BELGIUM. UNIV MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,RJ-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,RJ-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,SK-84215 BRATISLAVA,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA,SWITZERLAND. CTR RECH NUCL,IN2P3,CNRS,ULP,F-67037 STRASBOURG,FRANCE. NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. FZU,CAS,DIV HIGH ENERGY PHYS,INST PHYS,PRAGUE 18040,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 GRENOBLE,FRANCE. RES INST HIGH ENERGY PHYS,FIN-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV MIN & MET,INST NUCL PHYS,D-76128 KARLSRUHE,GERMANY. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV COPENHAGEN,NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NC,NUCL CTR MFF,PRAGUE 18000,CZECH REPUBLIC. NIKHEF H,NL-1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,OVIEDO 33006,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UC,CSIC,INST FIS CANTABRIA,SANTANDER 39006,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. JOZEF STEFAN INST,SL-61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,SL-61000 LJUBLJANA,SLOVENIA. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL,GERMANY. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. RP Abreu, P (reprint author), LIP,IST,FCUL,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Michelotto, Michele/A-9571-2013; Mundim, Luiz/A-1291-2012; Yip, Kin/D-6860-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Chudoba, Jiri/G-7737-2014; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; de Paula, Leandro/I-9278-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Navas, Sergio/N-4649-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; gandelman, miriam/N-3739-2014; Cabrera Urban, Susana/H-1376-2015; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; OI Dracos, Marcos/0000-0003-0514-193X; Michelotto, Michele/0000-0001-6644-987X; Mundim, Luiz/0000-0001-9964-7805; Yip, Kin/0000-0002-8576-4311; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Demaria, Natale/0000-0003-0743-9465; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; de Paula, Leandro/0000-0002-4984-7734; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Navas, Sergio/0000-0003-1688-5758; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Tome, Bernardo/0000-0002-7564-8392; Pimenta, Mario/0000-0002-2590-0908; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Lacasta, Carlos/0000-0002-2623-6252 NR 30 TC 8 Z9 8 U1 0 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1996 VL 71 IS 2 BP 199 EP 210 DI 10.1007/s002880050164 PG 12 WC Physics, Particles & Fields SC Physics GA UY761 UT WOS:A1996UY76100002 ER PT J AU Adomeit, J Amsler, C Armstrong, DS Baker, CA Barnett, BM Batty, CJ Benayoun, M Berdoz, A Beuchert, K Bischoff, S Blum, P Braune, K Brose, J Bugg, DV Case, T Cooper, AR Cramer, O Crowe, KM Degener, T Dietz, HP Djaoshvili, N vonDombrowski, S Doser, M Dunnweber, W Engelhardt, D Englert, M Faessler, MA Giaritta, P Hackmann, R Haddock, RP Heinsius, FH Herz, M Hessey, NP Hidas, P Holtzhaussen, C Illinger, P Jamnik, D Kalinowsky, H Kalteyer, B Kammle, B Kammel, P Kiel, T Kisiel, J Klempt, E Koch, H Kolo, C Kunze, M Lakata, M Landua, R Ludemann, J Matthay, H McCrady, R Meier, J Merlo, JP Meyer, CA Montanet, L Noble, A Ouared, R OuldSaada, F Peters, K Pinder, CN Pinter, G Ravndal, S Regenfus, C Reissmann, J Resag, S Roethel, W Schafer, E Schmidt, P Scott, I Seibert, R Spanier, S Stock, H Strassburger, C Strohbusch, U Suffert, M Thoma, U Tischhaser, M Urner, D Volcker, C Walter, F Walther, D Wiedner, U Zou, BS Zupancic, C AF Adomeit, J Amsler, C Armstrong, DS Baker, CA Barnett, BM Batty, CJ Benayoun, M Berdoz, A Beuchert, K Bischoff, S Blum, P Braune, K Brose, J Bugg, DV Case, T Cooper, AR Cramer, O Crowe, KM Degener, T Dietz, HP Djaoshvili, N vonDombrowski, S Doser, M Dunnweber, W Engelhardt, D Englert, M Faessler, MA Giaritta, P Hackmann, R Haddock, RP Heinsius, FH Herz, M Hessey, NP Hidas, P Holtzhaussen, C Illinger, P Jamnik, D Kalinowsky, H Kalteyer, B Kammle, B Kammel, P Kiel, T Kisiel, J Klempt, E Koch, H Kolo, C Kunze, M Lakata, M Landua, R Ludemann, J Matthay, H McCrady, R Meier, J Merlo, JP Meyer, CA Montanet, L Noble, A Ouared, R OuldSaada, F Peters, K Pinder, CN Pinter, G Ravndal, S Regenfus, C Reissmann, J Resag, S Roethel, W Schafer, E Schmidt, P Scott, I Seibert, R Spanier, S Stock, H Strassburger, C Strohbusch, U Suffert, M Thoma, U Tischhaser, M Urner, D Volcker, C Walter, F Walther, D Wiedner, U Zou, BS Zupancic, C TI Evidence for two isospin zero J(PC)=2(-+) mesons at 1645 and 1875 MeV SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID ETA-ETA; ANNIHILATION; RESONANCE AB Data on (p) over bar p --> eta pi(0) pi(0) pi(0) taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for two I = 0 J(PC) = 2(-+) resonances in eta pi pi. The first, at 1645 +/- 14(stat.) +/- 15(syst.) MeV with width 180 (+40)(-21) +/- 25 MeV, decays to a(2)(1320)pi with L = 0. It may be interpreted as the q (q) over bar D-1(2) partner of pi(2)(1670). A strong signal is also observed just above threshold in f(2)(1270)eta with L = 0. It is 11-22 times stronger than is expected for the high mass tail of the 1645 MeV resonance. It can be fitted as a second 2(-+) resonance at 1875 +/- 20 +/- 35 MeV with width 200 +/- 25 +/- 45 MeV. A third resonance having J(PC) = 2(++) is observed at 2135 +/- 20 +/- 45 MeV with Gamma = 250 +/- 25 +/- 45 MeV, decaying to both a(2)(1320)pi and f(2)(1270)eta with L = 1. There is no evidence for resonances with decays to a(0)(980)pi, sigma eta or f(0)(980)eta. C1 UNIV CALIF BERKELEY,LBL,BERKELEY,CA 94720. COLL WILLIAM & MARY,WILLIAMSBURG,VA. RUHR UNIV BOCHUM,D-44780 BOCHUM,GERMANY. UNIV BONN,D-53115 BONN,GERMANY. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV KARLSRUHE,D-76021 KARLSRUHE,GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,D-55099 MAINZ,GERMANY. UNIV MUNICH,D-80799 MUNICH,GERMANY. UNIV PARIS 06,LPNHE,F-75252 PARIS,FRANCE. UNIV PARIS 07,LPNHE,F-75252 PARIS,FRANCE. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV ZURICH,CH-8057 ZURICH,SWITZERLAND. UNIV LJUBLJANA,LJUBLJANA,SLOVENIA. SILESIAN UNIV,KATOWICE,POLAND. RP Adomeit, J (reprint author), UNIV HAMBURG,MARTINISTR 52,D-22761 HAMBURG,GERMANY. NR 21 TC 44 Z9 45 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1996 VL 71 IS 2 BP 227 EP 238 DI 10.1007/s002880050166 PG 12 WC Physics, Particles & Fields SC Physics GA UY761 UT WOS:A1996UY76100004 ER PT J AU Kang, HS Hines, JV Tinoco, I AF Kang, HS Hines, JV Tinoco, I TI Conformation of a non-frameshifting RNA pseudoknot from mouse mammary tumor virus SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE pseudoknot; RNA; frameshifts; NMR; translational control ID NUCLEAR-MAGNETIC-RESONANCE; POLYMERASE-III HOLOENZYME; NMR-SPECTROSCOPY; GENE-EXPRESSION; TRANSLATIONAL SUPPRESSION; COUPLING-CONSTANTS; FUSION PROTEIN; GAMMA-SUBUNIT; DNA; SEQUENCE AB The solution conformation of an RNA pseudoknot, which is a mutant of the pseudoknot required for ribosomal frameshifting in mouse mammary tumor virus, has been determined by NMR. The 32-nucleotide RNA pseudoknot does not promote efficient frameshifting, although its sequence is very similar to the efficient frameshifting pseudoknot whose structure was recently determined by our group. C-13-labeling of the RNA and C-13-edited NMR techniques were used to facilitate spectral assignment. The three-dimensional structure of the RNA pseudoknot was determined by restrained molecular dynamics based on NMR-derived interproton distances and torsion angle constraints. The conformation is very different from that previously determined for the efficient-frameshifting pseudoknot. Two unpaired nucleotides are stacked between stem 1 and stem 2, in contrast to the one unpaired nucleotide at the same junction region as found previously. The two stems of the pseudoknot are not coaxial, they are twisted and bent relative to each other. Loop 2 does not cross the shallow minor groove of stem 1, in contrast to the pseudoknots with one or no intervening nucleotides between the stems. The fact that a specific conformation is required for efficient frameshifting implies a specific interaction of the pseudoknot with the ribosome. (C) 1996 Academic Press Limited. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, STRUCT BIOL DIV, BERKELEY, CA 94720 USA. FU NIGMS NIH HHS [GM10840] NR 52 TC 44 Z9 46 U1 0 U2 5 PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 EI 1089-8638 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 31 PY 1996 VL 259 IS 1 BP 135 EP 147 DI 10.1006/jmbi.1996.0308 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UM405 UT WOS:A1996UM40500013 PM 8648641 ER PT J AU Zhang, H Skinner, MM Sandberg, WS Wang, AHJ Terwilliger, TC AF Zhang, H Skinner, MM Sandberg, WS Wang, AHJ Terwilliger, TC TI Context dependence of mutational effects in a protein: The crystal structures of the V351, 147V and V351/147V gene V protein core mutants SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE X-ray crystallography; gene V protein; site-specific mutants; protein stability; filamentous phage ID CAVITY-CREATING MUTATIONS; HYDROPHOBIC CORE; STAPHYLOCOCCAL NUCLEASE; PACKING ARRANGEMENTS; STABILITY; LYSOZYME; BACTERIOPHAGE-T4; CONSEQUENCES; T4-LYSOZYME; ENERGETICS AB The basis for the context dependence of the effects of core mutations on protein stability was investigated by comparing the structures of three gene V protein mutants with that of the wild-type protein. We previously examined a ''swapped'' mutant in which core residues Va135 and Ile47 were simply reserved so that the mutant had no hydrophobicity change from the native protein. The swapped mutant was destabilized by 3 kcal/mol per gene V protein dimer relative to the wild-type protein, demonstrating that factors other than hydrophobicity must make substantial contributions to the effects of mutations on the stability of the protein. Here we have determined the structure of this swapped mutant (V35I/147V) as well as those of the two constituent mutants (V35I and 147V). We find that the structures of the mutant proteins are very similar to that of the wild-type protein except for the necessary addition or deletion of methylene groups and for slight positional shifts of atoms around each mutated residue. The structure of the double mutant is a composite of the structures of the two single mutants. In the mutant structures, the V35I mutation fills a cavity that exists in the wild-type protein and the 147V mutation creates a new cavity. The structures oi the mutants indicate further that the reason the V35I and 147V mutations do not have opposite effects on stability is that the cavity in the wild-type protein filled by the V35I mutation is not optimally shaped for accommodating the additional methylene group of the isoleucine. These results support the concepts that the details of core packing have substantial influence on the effects of core mutations on protein stability and that these packing effects are major determinants of the context dependence of core mutation effects on stability. (C) 1996 Academic Press Limited. C1 UNIV ILLINOIS,DIV BIOPHYS,URBANA,IL 61801. UNIV ILLINOIS,DEPT CELL & STRUCT BIOL,URBANA,IL 61801. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. MASSACHUSETTS GEN HOSP,DEPT ANAESTHESIA,BOSTON,MA 02114. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 FU NIGMS NIH HHS [GM-38714, GM-41612] NR 52 TC 20 Z9 21 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 31 PY 1996 VL 259 IS 1 BP 148 EP 159 DI 10.1006/jmbi.1996.0309 PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UM405 UT WOS:A1996UM40500014 PM 8648642 ER PT J AU Wang, GJ Volkow, ND Fowler, JS Logan, J Gur, R Netusil, N Hitzemann, RJ Pappas, NS AF Wang, GJ Volkow, ND Fowler, JS Logan, J Gur, R Netusil, N Hitzemann, RJ Pappas, NS TI Age associated decrements in dopamine D-2 receptors in thalamus and in temporal insula of human subjects SO LIFE SCIENCES LA English DT Letter DE aging; extrastriatal dopamine receptors; [C-11]raclopride; positron emission tomography ID HUMAN-BRAIN; POSITRON TOMOGRAPHY; C-11 RACLOPRIDE; BINDING-SITES; PET AB This study evaluates the effects of age on DA D-2 receptors in extrastriatal regions. DA D-2 receptor availability was evaluated in 42 healthy male subjects (mean age 41 +/- 16, range 21 - 86 year old) with positron emission tomography (PET) and [C-11]raclopride. Estimates of B-max/K-d were obtained using the ratio of the distribution volume in the region of interest (caudate, putamen, thalamus, frontal, occipital cortices, temporal insula, cingulate and orbitofrontal gyri) to that in cerebellum. Correlations between age and D-2 receptors were significant in putamen (r = -0.58, p less than or equal to 0.0001), caudate (r = -0.54, p less than or equal to 0.0002), thalamus (r = -0.33, p less than or equal to 0.03) and temporal insula (r = -0.39, p less than or equal to 0.01) but not in any of the frontal regions. The decrease in DA D-2 receptor availability was 6.6% per decade in caudate, 8.2% in putamen, 7.6% in thalamus and 13% in temporal insula. This study indicates that D2 losses with age are not limited to striatum and involve also thalamic as well as temporal cortical regions. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY STONY BROOK,DEPT RADIOL,STONY BROOK,NY 11794. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. UNIV PENN,DEPT PSYCHIAT,PHILADELPHIA,PA 19119. RP Wang, GJ (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. FU NIDA NIH HHS [R01-DA06891] NR 23 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0024-3205 J9 LIFE SCI JI Life Sci. PD MAY 31 PY 1996 VL 59 IS 1 BP PL31 EP PL35 DI 10.1016/0024-3205(96)00262-7 PG 5 WC Medicine, Research & Experimental; Pharmacology & Pharmacy SC Research & Experimental Medicine; Pharmacology & Pharmacy GA UN740 UT WOS:A1996UN74000012 PM 8684263 ER PT J AU Volkow, ND Wang, GJ Fowler, JS Logan, J Gatley, SJ MacGregor, RR Schlyer, DJ Hitzemann, R Wolf, AP AF Volkow, ND Wang, GJ Fowler, JS Logan, J Gatley, SJ MacGregor, RR Schlyer, DJ Hitzemann, R Wolf, AP TI Measuring age-related changes in dopamine D-2 receptors with C-11-raclopride and F-18-N-methylspiroperidol SO PSYCHIATRY RESEARCH-NEUROIMAGING LA English DT Article DE aging; positron emission tomography; striatum; neurodegeneration ID HUMAN-BRAIN; BINDING-SITES; POSITRON TOMOGRAPHY; SEROTONIN RECEPTORS; C-11 RACLOPRIDE; D4 RECEPTORS; PET; SCHIZOPHRENIA; DENSITY AB This study investigates the rate of age-related dopamine D-2 receptor loss as determined by positron emission tomography (PET) and C-11-raclopride and compares it with D-2 loss previously estimated with F-18-N-methylspiroperidol (NMS). Dopamine D-2 receptors were measured with C-11-raclopride in 24 healthy volunteers (24-73 years of age) using the ratio of the distribution volume in striatum to that in cerebellum (B-max/K-d + 1). The results were compared with those obtained in 20 healthy male volunteers (20-49 years of age) in whom D-2 receptors were measured with NMS using the ratio index (slope of the striatum-to-cerebellum ratio as a function of time). Findings of correlational analysis between age and dopamine D-2 receptor availability were significant for both ligands. Estimates of dopamine D-2 receptor loss per decade corresponded to 7.9% for the C-11-raclopride study and 7.8% for the NMS study. Both ligands documented significant age-related decreases in dopamine D-2 receptors that occurred relatively early in life (40 years of age). C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP Volkow, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NIDA NIH HHS [5RO1-DA06891] NR 30 TC 102 Z9 104 U1 0 U2 2 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0925-4927 J9 PSYCHIAT RES-NEUROIM JI Psychiatry Res. Neuroimaging PD MAY 31 PY 1996 VL 67 IS 1 BP 11 EP 16 DI 10.1016/0925-4927(96)02809-0 PG 6 WC Clinical Neurology; Neuroimaging; Psychiatry SC Neurosciences & Neurology; Psychiatry GA UR220 UT WOS:A1996UR22000002 PM 8797238 ER PT J AU Volkow, ND Gillespie, H Mullani, N Tancredi, L Grant, C Valentine, A Hollister, L AF Volkow, ND Gillespie, H Mullani, N Tancredi, L Grant, C Valentine, A Hollister, L TI Brain glucose metabolism in chronic marijuana users at baseline and during marijuana intoxication SO PSYCHIATRY RESEARCH-NEUROIMAGING LA English DT Article DE positron emission tomography; delta-9-tetrahydrocannabinol; cerebellum; orbitofrontal cortex; basal ganglia; substance abuse ID POSITRON EMISSION TOMOGRAPHY; CEREBRAL BLOOD-FLOW; CANNABIS; MEMORY; DELTA-9-TETRAHYDROCANNABINOL; CEREBELLUM; ETHANOL AB Despite the widespread abuse of marijuana, knowledge about its effects in the human brain is limited. Brain glucose metabolism with and without Delta(9)tetrahydrocannabinol (THC) (main psychoactive component of marijuana) was evaluated in eight normal subjects and eight chronic marijuana abusers with positron emission tomography. At baseline, marijuana abusers showed lower relative cerebellar metabolism than normal subjects. THC increased relative cerebellar metabolism in all subjects, but only abusers showed increases in orbitofrontal cortex, prefrontal cortex, and basal ganglia, Cerebellar metabolism during THC intoxication was significantly correlated with the subjective sense of intoxication. The decreased cerebellar metabolism in marijuana abusers at baseline could account for the motor deficits previously reported in these subjects, The activation of orbitofrontal cortex and basal ganglia by THC in the abusers but not in the normal subjects could underlie one of the mechanisms leading to the drive and the compulsion to self-administer the drug observed in addicted individuals. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. UNIV TEXAS,DEPT PSYCHIAT,HOUSTON,TX. UNIV TEXAS,DEPT INTERNAL MED,HOUSTON,TX. RP Volkow, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NIDA NIH HHS [5RO1-DA-06278] NR 45 TC 133 Z9 138 U1 1 U2 3 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0925-4927 J9 PSYCHIAT RES-NEUROIM JI Psychiatry Res. Neuroimaging PD MAY 31 PY 1996 VL 67 IS 1 BP 29 EP 38 DI 10.1016/0925-4927(96)02817-X PG 10 WC Clinical Neurology; Neuroimaging; Psychiatry SC Neurosciences & Neurology; Psychiatry GA UR220 UT WOS:A1996UR22000004 PM 8797240 ER PT J AU ChristensenDalsgaard, J Dappen, W Ajukov, SV Anderson, ER Antia, HM Basu, S Baturin, VA Berthomieu, G Chaboyer, B Chitre, SM Cox, AN Demarque, P Donatowicz, J Dziembowski, WA Gabriel, M Gough, DO Guenther, DB Guzik, JA Harvey, JW Hill, F Houdek, G Iglesias, CA Kosovichev, AG Leibacher, JW Morel, P Proffitt, CR Provost, J Reiter, J Rhodes, EJ Rogers, FJ Roxburgh, IW Thompson, MJ Ulrich, RK AF ChristensenDalsgaard, J Dappen, W Ajukov, SV Anderson, ER Antia, HM Basu, S Baturin, VA Berthomieu, G Chaboyer, B Chitre, SM Cox, AN Demarque, P Donatowicz, J Dziembowski, WA Gabriel, M Gough, DO Guenther, DB Guzik, JA Harvey, JW Hill, F Houdek, G Iglesias, CA Kosovichev, AG Leibacher, JW Morel, P Proffitt, CR Provost, J Reiter, J Rhodes, EJ Rogers, FJ Roxburgh, IW Thompson, MJ Ulrich, RK TI The current state of solar modeling SO SCIENCE LA English DT Review ID ROSSELAND OPACITY TABLES; STELLAR ENVELOPES; CONVECTION ZONE; OSCILLATION FREQUENCIES; PULSATIONAL STABILITY; EVOLUTIONARY MODELS; HELIUM ABUNDANCE; NEUTRINO PROBLEM; EQUATION; SUN AB Data from the Global Oscillation Network Group (GONG) project and other helioseismic experiments provide a test for models of stellar interiors and for the thermodynamic and radiative properties, on which the models depend, of matter under the extreme conditions found in the sun. Current models are in agreement with the helioseismic inferences, which suggests, for example, that the disagreement between the predicted and observed fluxes of neutrinos from the sun is not caused by errors in the models. However, the GONG data reveal subtle errors in the models, such as an excess In sound speed just beneath the convection zone. These discrepancies indicate effects that have so far not been correctly accounted for; for example, it is plausible that the sound-speed differences reflect weak mixing in stellar interiors, of potential importance to the overall evolution of stars and ultimately to estimates of the age of the galaxy based on stellar evolution calculations. C1 AARHUS UNIV, INST PHYS & ASTRON, DK-8000 AARHUS C, DENMARK. UNIV SO CALIF, DEPT PHYS & ASTRON, LOS ANGELES, CA 90089 USA. MOSCOW MV LOMONOSOV STATE UNIV, STERNBERG ASTRON INST, Moscow, RUSSIA. NATL OPT ASTRON OBSERV, NATL SOLAR OBSERV, TUCSON, AZ 85726 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. UNIV LONDON QUEEN MARY & WESTFIELD COLL, ASTRON UNIT, LONDON E1 4NS, ENGLAND. OBSERV COTE AZUR, F-06003 NICE, FRANCE. UNIV TORONTO, CANADIAN INST THEORET ASTROPHYS, TORONTO, ON M5S 1A1, CANADA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. YALE UNIV, DEPT ASTRON, NEW HAVEN, CT 06520 USA. UNIV VIENNA, INST ASTRON, A-1180 VIENNA, AUSTRIA. COPERNICUS CTR, WARSAW, POLAND. UNIV LIEGE, INST ASTROPHYS, B-4000 LIEGE, BELGIUM. UNIV CAMBRIDGE, INST ASTRON, CAMBRIDGE, ENGLAND. ST MARYS UNIV, DEPT PHYS & ASTRON, HALIFAX, NS B3H 3C3, CANADA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. STANFORD UNIV, CTR SPACE SCI & ASTROPHYS, STANFORD, CA 94305 USA. NASA, GODDARD SPACE FLIGHT CTR, COMP SCI CORP, GREENBELT, MD 20771 USA. TECH UNIV MUNICH, INST MATH, W-8000 MUNICH, GERMANY. UNIV CALIF LOS ANGELES, DEPT PHYS & ASTRON, LOS ANGELES, CA 90095 USA. RP ChristensenDalsgaard, J (reprint author), AARHUS UNIV, THEORET ASTROPHYS CTR, DK-8000 AARHUS C, DENMARK. RI Basu, Sarbani/B-8015-2014; OI Basu, Sarbani/0000-0002-6163-3472; Chaboyer, Brian/0000-0003-3096-4161 NR 115 TC 709 Z9 712 U1 4 U2 26 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 MAY 31 PY 1996 VL 272 IS 5266 BP 1286 EP 1292 DI 10.1126/science.272.5266.1286 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UN472 UT WOS:A1996UN47200032 ER PT J AU Gough, DO Kosovichev, AG Toomre, J Anderson, E Antia, HM Basu, S Chaboyer, B Chitre, SM ChristensenDalsgaard, J Dziembowski, WA EffDarwich, A Elliott, JR Giles, PM Goode, PR Guzik, JA Harvey, JW Hill, F Leibacher, JW Monteiro, MJPFG Richard, O Sekii, T Shibahashi, T Takata, M Thompson, MJ Vauclair, S Vorontsov, SV AF Gough, DO Kosovichev, AG Toomre, J Anderson, E Antia, HM Basu, S Chaboyer, B Chitre, SM ChristensenDalsgaard, J Dziembowski, WA EffDarwich, A Elliott, JR Giles, PM Goode, PR Guzik, JA Harvey, JW Hill, F Leibacher, JW Monteiro, MJPFG Richard, O Sekii, T Shibahashi, T Takata, M Thompson, MJ Vauclair, S Vorontsov, SV TI The seismic structure of the sun SO SCIENCE LA English DT Article ID INVERTING HELIOSEISMIC DATA; SOLAR AB Global Oscillation Network Group data reveal that the internal structure of the sun can be well represented by a calibrated standard model. However, immediately beneath the convection zone and at the edge of the energy-generating core, the sound-speed variation is somewhat smoother in the sun than it is in the model. This could be a consequence of chemical inhomogeneity that is too severe in the model, perhaps owing to inaccurate modeling of gravitational settling or to neglected macroscopic motion that may be present in the sun. Accurate knowledge of the sun's structure enables inferences to be made about the physics that controls the sun; for example, through the opacity, the equation of state, or wave motion. Those inferences can then be used elsewhere in astrophysics. C1 STANFORD UNIV, HEPL, STANFORD, CA USA. UNIV COLORADO, JOINT INST LAB ASTROPHYS, BOULDER, CO 80309 USA. NATL OPT ASTRON OBSERV, NATL SOLAR OBSERV, TUCSON, AZ 85726 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. AARHUS UNIV, THEORET ASTROPHYS CTR, AARHUS, DENMARK. CANADIAN INST THEORET ASTROPHYS, TORONTO, ON M5S 1A1, CANADA. COPERNICUS ASTRON CTR, WARSAW, POLAND. NEW JERSEY INST TECHNOL, NEWARK, NJ 07102 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM USA. UNIV PORTO, OPORTO, PORTUGAL. OBSERV MIDI PYRENEES, F-31400 TOULOUSE, FRANCE. UNIV TOKYO, DEPT ASTRON, TOKYO 113, JAPAN. INST ASTROFIS CANARIAS, TENERIFE, TENERIFE, SPAIN. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. RP Gough, DO (reprint author), UNIV CAMBRIDGE, INST ASTRON, MADINGLEY RD, CAMBRIDGE CB3 0HA, ENGLAND. RI Richard, Olivier/B-9301-2012; Monteiro, Mario J.P.F.G./B-4715-2008; Basu, Sarbani/B-8015-2014; OI Richard, Olivier/0000-0002-0342-5093; Monteiro, Mario J.P.F.G./0000-0003-0513-8116; Basu, Sarbani/0000-0002-6163-3472; Chaboyer, Brian/0000-0003-3096-4161 NR 44 TC 179 Z9 179 U1 1 U2 6 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 MAY 31 PY 1996 VL 272 IS 5266 BP 1296 EP 1300 DI 10.1126/science.272.5266.1296 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UN472 UT WOS:A1996UN47200034 ER PT J AU Sales, BC Mandrus, D Williams, RK AF Sales, BC Mandrus, D Williams, RK TI Filled skutterudite antimonides: A new class of thermoelectric materials SO SCIENCE LA English DT Article ID THERMAL-CONDUCTIVITY; LAFE4P12 AB A class of thermoelectric materials has been synthesized with a thermoelectric figure of merit ZT(where T is temperature and Z is a function of thermopower, electrical resistivity, and thermal conductivity) near 1 at 800 kelvin. Although these materials have not been optimized, this Value is comparable to the best ZT values obtained for any previously studied thermoelectric material. Calculations indicate that the optimized material should have ZT values of 1.4. These ternary semiconductors have the general formula RM(4)X(12) (where R is lanthanum, cerium, praseodymium, neodymium, or europium; M is iron, ruthenium, or osmium; and X is phosphorus, arsenic, or antimony) and represent a new approach to creating improved thermoelectric materials. Several alloys in the compositionrange CeFe4-xCoxSb12 or LaFe4-xCoxSb12 (0 < x < 4) have large values of ZT. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP Sales, BC (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Mandrus, David/H-3090-2014 NR 27 TC 1278 Z9 1326 U1 40 U2 366 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 31 PY 1996 VL 272 IS 5266 BP 1325 EP 1328 DI 10.1126/science.272.5266.1325 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UN472 UT WOS:A1996UN47200042 ER PT J AU Schreyer, HL Neilsen, MK AF Schreyer, HL Neilsen, MK TI Analytical and numerical tests for loss of material stability SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE material stability; loss of ellipticity; discontinuous bifurcation; numerical solution ID PLANE-STRAIN; LOCALIZATION; BIFURCATIONS; DEFORMATION AB Material instability occurs when ellipticity is lost for symmetric constitutive equations. Prior to loss-of ellipticity it is possible that the second-order work of Hill or Drucker becomes negative. There are implications in the literature that numerical solutions cease to be meaningful when a material strain softens and the second-order work is not positive. The instant that the second-order work is zero or negative simultaneously with the additional restriction that the strain increments satisfy compatibility is equivalent to the loss of the ellipticity criterion for symmetric constitutive relations, The loss of ellipticity criterion is the appropriate one for identifying when numerical solutions cease to show convergence and may also be a suitable criterion for identifying the instant at which material failure is initiated. An analytical development is provided for loss of ellipticity together with an explicit expression for the normal to the bifurcation plane. Numerical solutions are given for several sample problems. For all cases, the numerical solutions based on the finite element method conform to the theoretical expectations that unique numerical solutions exist prior to the point at which ellipticity is lost. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP Schreyer, HL (reprint author), UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131, USA. NR 28 TC 25 Z9 25 U1 1 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD MAY 30 PY 1996 VL 39 IS 10 BP 1721 EP & DI 10.1002/(SICI)1097-0207(19960530)39:10<1721::AID-NME924>3.0.CO;2-X PG 23 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA UJ903 UT WOS:A1996UJ90300006 ER PT J AU Wen, SJ Richardson, TJ Ghantous, DI Striebel, KA Ross, PN Cairns, EJ AF Wen, SJ Richardson, TJ Ghantous, DI Striebel, KA Ross, PN Cairns, EJ TI FTIR characterization of PEO+LiN(CF3SO2)(2) electrolytes SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE FTIR; thin films; polyethylene oxide; lithium trifluoromethanesulfonimide ID POLY(ETHYLENE OXIDE); IONIC ASSOCIATION; CONDUCTIVITY BEHAVIOR; POLYMER ELECTROLYTES; PHASE-DIAGRAMS; METAL SALTS; COMPLEXES; SPECTROSCOPY; MORPHOLOGY; TRIFLATE AB FTIR transmission spectra of thin films of polyethylene oxide (PEO) + lithium trifluoromethanesulfonimide (LiN(CF3SO2)(2), LiTFSI) mixtures have been obtained for ethylene oxide/Li ratios from 64: 1 to 2: 1. The phase information from these spectra is compared with the reported phase diagrams based on thermal measurements. The infrared spectrum of LiTFSI is assigned by analogy with those of related compounds. Using the spectral subtraction technique, the effects of Li+ solvation on the PEO matrix and of ion pairing and aggregate formation on the TFSI anion are revealed. An explanation is offered for the variation in ionic conductivity for compositions within the ''crystallinity gap''. C1 UNIV CALIF BERKELEY,ERNEST ORLANDO LAWRENCE BERKELEY NATL LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,ERNEST ORLANDO LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RI Cairns, Elton/E-8873-2012 OI Cairns, Elton/0000-0002-1179-7591 NR 33 TC 91 Z9 91 U1 6 U2 29 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAY 30 PY 1996 VL 408 IS 1-2 BP 113 EP 118 DI 10.1016/0022-0728(96)04536-6 PG 6 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA UY747 UT WOS:A1996UY74700014 ER PT J AU DiCamillo, BA Hettich, RL Guiochon, G Compton, RN Saunders, M JimenezVazquez, HA Khong, A Cross, RJ AF DiCamillo, BA Hettich, RL Guiochon, G Compton, RN Saunders, M JimenezVazquez, HA Khong, A Cross, RJ TI Enrichment and characterization of a noble gas fullerene: Ar@C-60 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID TRANSFORM MASS-SPECTROMETRY; CLUSTERS; HELIUM AB AT@C-60, synthesized by heating primarily C-60 (with trace amounts of C-70) under a high pressure of argon gas, was purified by high-performance liquid chromatography (HPLC) and examined by Fourier transform mass spectrometry (FTMS). The sample, which consisted of 0.1% Ar@C-60, was dissolved in toluene and separated with HPLC using a COSMOSIL, 5PYE column as the stationary phase and toluene as the eluent (UV detection). AT@C-60 was enriched by a factor of about 400 relative to the starting material. AT@C-60 was also examined by X-ray photoelectron spectroscopy (XPS) but was found to be sensitive to radiation damage and subsequent depletion. Low-energy collisional dissociation of Ar@C-60(+) in the FTMS yields primarily C-58(+), generated by loss of the argon atom and C-2. The ionization potential of Ar@C-60 was bracketed by charge-exchange reactions and was found to be between 7.53 and 7.8 eV, which is indistinguishable from that of C-60 (7.65 eV). C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV CALIF LOS ANGELES,DEPT CHEM,LOS ANGELES,CA 90024. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. YALE UNIV,DEPT CHEM,NEW HAVEN,CT 06520. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 24 TC 50 Z9 50 U1 2 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 30 PY 1996 VL 100 IS 22 BP 9197 EP 9201 DI 10.1021/jp960049k PG 5 WC Chemistry, Physical SC Chemistry GA UN397 UT WOS:A1996UN39700001 ER PT J AU Pimblott, SM LaVerne, JA Bartels, DM Jonah, CD AF Pimblott, SM LaVerne, JA Bartels, DM Jonah, CD TI Reconciliation of transient absorption and chemically scavenged yields of the hydrated electron in radiolysis SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LAPLACE TRANSFORM RELATIONSHIP; RADIATION-CHEMISTRY; STOCHASTIC-MODELS; AQUEOUS-SOLUTIONS; PULSE-RADIOLYSIS; WATER; KINETICS; PICOSECONDS; DEPENDENCES; RADICALS AB The lung-standing discrepancy between the kinetics of the hydrated electron measured in pulse radiolysis experiments and the time dependent decay inferred from the inverse Laplace transform of scavenger data is resolved by the incorporation of all improved measurement of the rate coefficient for the CH3Cl + e(aq)(-) reaction used in the inverse Laplace transform treatment. The revised analysis of both data types leads to the conclusion that the spatial distribution of secondary electrons produced in the energetic electron radiolysis of water is nearly twice as wide as suggested by previous studies. C1 UNIV NOTRE DAME,RADIAT LAB,NOTRE DAME,IN 46556. RP Pimblott, SM (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 38 TC 41 Z9 41 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 30 PY 1996 VL 100 IS 22 BP 9412 EP 9415 DI 10.1021/jp960816f PG 4 WC Chemistry, Physical SC Chemistry GA UN397 UT WOS:A1996UN39700034 ER PT J AU Sun, YF Chen, ZH Cavenaugh, KL Sachleben, RA Moyer, BA AF Sun, YF Chen, ZH Cavenaugh, KL Sachleben, RA Moyer, BA TI Equilibria and speciation in the solvent extraction of lithium chloride by nonamethyl-14-crown-4 ether in 1-octanol SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID 14-CROWN-4 DERIVATIVES; COMPLEXATION; SELECTIVITY; ION; DIBENZO-14-CROWN-4; SUBSTITUENTS; COEFFICIENTS; 16-CROWN-4; IONOPHORES; ACID AB The equilibria and speciation in the solvent extraction of LiCl by nonamethyl-14-crown-4 ether in 1-octanol have been determined by use of ion chromatography (IC) and inductively coupled plasma (ICP) analyses, equilibrium modeling with the program SXLSQI, and Li-7 NMR measurements, SXLSQI modeling of the extraction data indicates the formation of a 1:1 metal:crown complex in the organic phase, The complex apparently exists as an ion-pair Li(crown)Cl, which partially dissociates to the complex cation Li(crown)(+) and free chloride anion Cl-. Extraction of LiCl by 1-octanol to give the organic-phase ion-pair LiCl and its dissociated ions Li+ and Cl- must be included in the data analysis. Li-7 NMR measurements verify the existence of free and crown-complexed lithium species in 1-octanol, and the measurements quantitatively agree with results from the SXLSQI model. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Solominow, Sonia/A-4021-2008; Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 NR 41 TC 10 Z9 10 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 30 PY 1996 VL 100 IS 22 BP 9500 EP 9505 DI 10.1021/jp9533537 PG 6 WC Chemistry, Physical SC Chemistry GA UN397 UT WOS:A1996UN39700047 ER PT J AU Carpinelli, JM Weitering, HH Plummer, EW Stumpf, R AF Carpinelli, JM Weitering, HH Plummer, EW Stumpf, R TI Direct observation of a surface charge density wave SO NATURE LA English DT Article ID GE(111); PB; W(001); TRANSITION; PHASE; MO(001); PHONONS AB A CHARGE density wave (CDW) is a periodic symmetry-lowering redistribution of charge within a material, accompanied by a rearrangement of electronic bands (such that the total electronic energy is decreased) and usually a small periodic lattice distortion(1,2). This phenomenon is most commonly observed in crystals of reduced symmetry, such as quasi-two-dimensional(3) or quasi-one-dimensional(4) materials. In principle, the reduction of symmetry associated with surfaces and interfaces might also facilitate the formation of CDWs; although there is some indirect evidence for surface charge density waves(5-12,14), none has been observed directly., Here we report the observation and characterization of a reversible, temperature-induced CDW localized at the lead-coated (111) surface of a germanium crystal. The formation of this new phase is accompanied by significant periodic valence charge redistribution, a pronounced lattice distortion and a metal-nonmetal transition, Theoretical calculations confirm that electron-phonon coupling drives the transition to the CDW, but it appears that some other factor-probably electron-electron correlations-is responsible for the ground-state stability of this phase. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP Carpinelli, JM (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 30 TC 275 Z9 275 U1 12 U2 66 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAY 30 PY 1996 VL 381 IS 6581 BP 398 EP 400 DI 10.1038/381398a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UN479 UT WOS:A1996UN47900043 ER PT J AU Kamal, B Contogouris, AP Merebashvili, Z AF Kamal, B Contogouris, AP Merebashvili, Z TI Soffer's inequality in the QCD parton model SO PHYSICS LETTERS B LA English DT Article AB Higher-order corrections (HOC) to Soffer's inequality between the various parton distributions are determined within the QCD parton model. The resulting inequality gives an upper bound to the transversity distributions determined in the (M) over bar (S) over bar scheme; this bound may be used in any process where transversity distributions enter. For the u- and d-quarks, the HOC are negative and moderate in magnitude. For the sea quarks, the HOC are somewhat larger and also negative. C1 UNIV ATHENS,GR-15771 ATHENS,GREECE. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP Kamal, B (reprint author), MCGILL UNIV,DEPT PHYS,3600 UNIV ST,MONTREAL,PQ H3A 2T8,CANADA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 30 PY 1996 VL 376 IS 4 BP 290 EP 294 DI 10.1016/0370-2693(96)00320-6 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UR276 UT WOS:A1996UR27600006 ER PT J AU AbuOmar, MM Hansen, PJ Espenson, JH AF AbuOmar, MM Hansen, PJ Espenson, JH TI Deactivation of methylrhenium trioxide-peroxide catalysts by diverse and competing pathways SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MAIN-GROUP ELEMENTS; MULTIPLE BONDS; TRANSITION-METALS; HYDROGEN-PEROXIDE; CRYSTAL-STRUCTURE; MOLECULAR-OXYGEN; METHYLTRIOXORHENIUM; OXIDATION; COMPLEX; BASES AB The peroxides from methylrhenium trioxide (MTO) and hydrogen peroxide, CH3ReO2(eta(2)-O-2), A, and CH3Re(O)(eta(2)-O-2)(2)(H2O), B, have been fully characterized in both organic and aqueous media by spectroscopic means (NMR and UV-vis). In aqueous solution, the equilibrium constants for their formation are K-1 = 16.1 +/- 0.2 L mol(-1) and K-2 = 132 +/- 2 L mol(-1) at pH 0, mu = 2.0 M, and 25 degrees C. In the presence of hydrogen peroxide the catalyst decomposes to methanol and perrhenate ions with a rate that is dependent on [H2O2] and [H3O+]. The complex peroxide and pH dependences could be explained by one of two possible pathways: attack of either hydroxide on A or HO2- on MTO. The respective second-order rate constants for these reactions which were deduced from comprehensive kinetic treatments are k(A) = (6.2 +/- 0.3) x 10(9) and k(MTo) = (4.1 +/- 0.2) x 10(8) L mol(-1) s(-1) at mu = 0.01 M and 25 degrees C. The plot of log ky: versus pH for the decomposition reaction is linear with a unit slope in the pH range 1.77-6.50. The diperoxide B decomposes much more slowly to yield O-2 and CH3ReO3. This is a minor pathway, however, amounting to <1% of the methanol and perrhenate ions produced from the irreversible deactivation at any given pH. Within the limited precision for this rate constant, it appears to vary linearly with [OH-] with k = 3 x 10(-4) s(-1) at pH 3.21, mu = 0.10 M, and 25 degrees C. Without peroxide, CH3ReO3 is stable below pH 7, but decomposes in alkaline aqueous solution to yield CH4 and ReO4-. As a consequence, the decomposition rate rises sharply with [H2O2], peaking at the concentration at which [A] is a maximum, and then falling to a much smaller value. Variable-temperature H-1 NMR experiments revealed the presence of a labile coordinated water in B, but supported the anhydride form for A. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 28 TC 114 Z9 115 U1 1 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 29 PY 1996 VL 118 IS 21 BP 4966 EP 4974 DI 10.1021/ja952305x PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA UN396 UT WOS:A1996UN39600006 ER PT J AU Chen, H Ogo, S Fish, RH AF Chen, H Ogo, S Fish, RH TI Bioorganometallic chemistry .8. The molecular recognition of aromatic and aliphatic amino acids and substituted aromatic and aliphatic carboxylic acid guests with supramolecular (eta(5)-pentamethylcyclopentadienyl)rhodium-nucleobase, nucleoside, and nucleotide cyclic trimer hosts via non-covalent pi-pi and hydrophobic interactions in water: Steric, electronic, and conformational parameters SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ADENOSINE-MONOPHOSPHATE; AQUA COMPLEX; COORDINATION; NUCLEOBASE; RECEPTOR AB Molecular recognition, via non-covalent processes such as hydrogen bonding, pi-pi, and hydrophobic interactions, is an important biological phenomenon for guests, such as drugs, proteins, and other important biological molecules with, for example, host DNA/RNA. We have studied a novel molecular recognition process using guests that encompass aromatic and aliphatic amino acids [L-alanine, L-glutamine (L-Gln), L-histidine, L-isoleucine (L-Ile), L-leucine (L-Leu), L-phenylalanine (L-Phe), L-proline, L-tryptophan (L-Trp), L-valine (L-Val)], substituted aromatic carboxylic acids [o-, m-, p-aminobenzoic acids (G1-3), benzoic acid (G4), phenylacetic acid (G5), p-methoxyphenylacetic acid (G6), o-methyoxybenzoic acid (G9), o-nitrobenzoic acid (G10)], and aliphatic carboxylic acids [cyclohexylacetic acid (G7), 1-adamantanecarboxylic acid (G8)] with supramolecular, bioorganometallic hosts, (eta(5)-pentamethylcyclopentadienyl)rhodium (Cp*Rh)-nucleobase, nucleoside, and nudeotide cyclic trimer complexes, [Cp*Rh(9-methyladenine)](3)(OTf)(3) (1) (OTf = trifluoromethanesulfonate), [Cp*Rh(adenosine)](3)(OTf)(3) (2), [Cp*Rh-(2'-deoxyadenosine)](3) (OTf)3 (3), [Cp*Rh(2',3'-dideoxyadenosine)](3)(OTf)(3) (4), and [Cp*Rh(Me-5'-AMP)](3) (5), in aqueous solution at pH 7, utilizing H-1 NMR, NOE, and molecular modeling techniques, and, as well, determining association constants (K-a) and free energies of complexation (Delta G(degrees)). The host-guest complexation occurs predominantly via non-covalent pi-pi, hydrophobic, and possible subtle H-bonding interactions, with steric, electronic, and molecular conformational parameters as important criteria. Moreover, we note that both the pi-pi and hydrophobic interactions seem to be equally important when competing aromatic and aliphatic carboxylic acid guests, G5 and G7, for host 3. The solvophobic effects in H2O also control the extent of host-guest interaction and will be discussed. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 34 TC 108 Z9 108 U1 0 U2 8 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 MAY 29 PY 1996 VL 118 IS 21 BP 4993 EP 5001 DI 10.1021/ja954040s PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA UN396 UT WOS:A1996UN39600009 ER PT J AU Wang, LQ Liu, J Exarhos, GJ Bunker, BC AF Wang, LQ Liu, J Exarhos, GJ Bunker, BC TI Investigation of the structure and dynamics of surfactant molecules in mesophase silicates using solid-state C-13 NMR SO LANGMUIR LA English DT Article ID LIQUID-CRYSTAL TEMPLATE; X-RAY; WATER AB The structure and dynamics of surfactant molecule reorganization in mesophase silicates have been investigated using variable-temperature C-13 solid-state nuclear magnetic resonance (NMR) spectroscopy. Functional groups and side groups of the surfactant CTAC (cetyltrimethylammonium chloride) were identified from high-resolution C-13 MAS (magic angle spinning) NMR spectra obtained using high-power H-1 decoupling. We also obtained information on surfactant organization and relaxation in mesophase silicates using a combination of NMR line-shape and relaxation-time analyses with variable-temperature NMR. The behavior of the surfactant in the ordered mesophase silicate was compared with that of the surfactant solution (CTAC-water) and that of the surfactant in the disordered silicate, which was precipitated in solution during an early stage of the reaction. The electrostatic binding between the electropositive end of the surfactant and the silicate substrate causes a similar to 1 ppm downfield shift for the NMR resonance associated with the methyl groups next to the head group and substantial broadening for the peak corresponding to the methylene group adjacent to the head group. The splitting of the resonance associated with the N-methyl groups suggests that the methyl groups next to the head group lose their stereochemical symmetry due to the intermolecular interaction in the ordered mesophase silicates. Each segment of the surfactant associated with an ordered silicate is less mobile than the corresponding segment associated with a disordered silicate precursor. For both ordered and disordered silicates, the methylene group adjacent to the head group exhibits a marked lack of motion relative to other segments of the surfactant. Variable-temperature NMR studies show motional narrowing as temperature increases. The NMR results obtained from this study provide insight into the formation mechanism of mesophase materials. RP Wang, LQ (reprint author), PACIFIC NW NATL LAB,DEPT MAT SCI,RICHLAND,WA 99352, USA. NR 17 TC 62 Z9 64 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAY 29 PY 1996 VL 12 IS 11 BP 2663 EP 2669 DI 10.1021/la951515k PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA UP041 UT WOS:A1996UP04100009 ER PT J AU Vaidya, R Simonson, RJ Cesarano, J Dimos, D Lopez, GP AF Vaidya, R Simonson, RJ Cesarano, J Dimos, D Lopez, GP TI Formation and stability of self-assembled monolayers on thin films of lead zirconate titanate (PZT) SO LANGMUIR LA English DT Article ID PENETRATION-CONTROLLED REACTIONS; ORGANIZED MOLECULAR ASSEMBLIES; LONG-CHAIN SURFACTANTS; AQUEOUS PERMANGANATE INTERACTION; RAY PHOTOELECTRON-SPECTROSCOPY; OXIDIZED ALUMINUM SURFACE; NORMAL-ALKANOIC ACIDS; ELECTROCHEMICAL PROPERTIES; INFRARED-SPECTROSCOPY; FERROELECTRIC MEMORY AB Self-assembled monolayers (SAMs) of alkylsiloxanes were formed from hexyltrichlorosilane (HTS) and octadecyltrichlorosilane (OTS) on surfaces of thin films of a complex oxide, lead zirconate titanate (PZT). X-ray photoelectron spectroscopy (XPS) and contact angle measurements confirmed the formation of a thin, uniform organic layer on the surface of the PZT, consistent with the hypothesis that a densely packed organic monolayer is formed on the PZT. Angle-resolved high-resolution XPS suggested that the surface of the PZT thin film includes a top layer deficient in titanium and consisting mainly of oxides of lead and zirconium, along with hydroxylated zirconium that may react with alkyltrichlorosilanes to form the SAMs. The effect on these SAMs of exposure to acidic media was probed by wettability measurements, XPS, and scanning electron microscopy(SEM). Contact angle measurements with water and hexadecane indicated that the SAMs formed from the longer alkylsilane, OTS, were stable in HCl over long periods of time (at least 3 days), while the SAMs formed from the short-chain alkylsilane, HTS, degraded after 12 h. The XPS spectra of SAMs formed from OTS and exposed to HCl solution were similar to those obtained for similar SAMs not exposed to HCl. SEM also confirmed that the SAMs formed from OTS can act as protective barriers for PZT against etching by HCl. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ADV MAT LAB,ALBUQUERQUE,NM 87106. NR 66 TC 18 Z9 18 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAY 29 PY 1996 VL 12 IS 11 BP 2830 EP 2836 DI 10.1021/la951072k PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA UP041 UT WOS:A1996UP04100033 ER PT J AU Krstic, PS Schultz, DR Janev, RK AF Krstic, PS Schultz, DR Janev, RK TI Inelastic processes in slow collisions of antiprotons with hydrogenic ions SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID IONIZATION; EXCITATION; PROTONS; ELECTRONS; HELIUM AB We present a comprehensive theoretical study of the physical processes which govern inelastic transitions in slow collisions of antiprotons with hydrogenic ions. Two-centre-one-electron mechanisms are highlighted. Various channels for ionization and excitation are identified utilizing the theory of hidden crossings. New features of the quasimolecular potentials, caused by the negative charge of the antiproton, are described in detail, with particular attention to the topology of the electronic eigenenergy surface in the plane of complex internuclear distance. The ionization and excitation cross sections are calculated and compared with the results of other theories and recent experiments. C1 INT ATOM ENERGY AGCY,A-1400 VIENNA,AUSTRIA. RP Krstic, PS (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 34 TC 39 Z9 39 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAY 28 PY 1996 VL 29 IS 10 BP 1941 EP 1968 DI 10.1088/0953-4075/29/10/007 PG 28 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA UP445 UT WOS:A1996UP44500007 ER PT J AU Brundermann, E Linhart, AM Reichertz, L Roser, HP Dubon, OD Hansen, WL Sirmain, G Haller, EE AF Brundermann, E Linhart, AM Reichertz, L Roser, HP Dubon, OD Hansen, WL Sirmain, G Haller, EE TI Double acceptor doped Ge: A new medium for inter-valence-band lasers SO APPLIED PHYSICS LETTERS LA English DT Article ID STIMULATED-EMISSION; P-GE; TRANSITIONS; GERMANIUM; STATES AB We report on intervalence-band laser emission from Be- and Zn-doped germanium crystals. The duty cycle of 10(-3) at a repetition rate of 1 kHz is one order of magnitude larger than the highest duty cycle reported for p-Ge lasers doped by group II accepters. This improvement is due to the much larger hole binding energy of double accepters Be and Zn which results in a strong reduction of the internal absorption of the generated far-infrared radiation. Laser action has been achieved with crystal volumes as small as 0.04 cm(-3), and a laser pulse length df 25 mu s has been reached. Germanium crystals doped with these accepters may offer an opportunity for achieving the ultimate goal of continuous wave operation. (C) 1996 American Institute of Physics. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720. RP Brundermann, E (reprint author), DLR,INST SPACE SENSOR TECHNOL,D-12489 BERLIN,GERMANY. RI Bruendermann, Erik/J-7186-2016 OI Bruendermann, Erik/0000-0003-4119-3489 NR 14 TC 24 Z9 24 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1996 VL 68 IS 22 BP 3075 EP 3077 PG 3 WC Physics, Applied SC Physics GA UM643 UT WOS:A1996UM64300005 ER PT J AU Gea, LA Boatner, LA AF Gea, LA Boatner, LA TI Optical switching of coherent VO2 precipitates formed in sapphire by ion implantation and annealing SO APPLIED PHYSICS LETTERS LA English DT Article ID PHASE-TRANSITION; FILMS AB Coherent precipitates of vanadium dioxide have been formed in the near-surface region of sapphire by the stoichiometric coimplantation of vanadium and oxygen combined with subsequent thermal processing at temperatures ranging from 700 to 1000 degrees C. The embedded VO2 precipitates, which are three-dimensionally oriented with respect to the Al2O3 host lattice, undergo a first-order monoclinic-to-tetragonal (and also semiconducting-to-metallic) phase transition at similar to 77 degrees C. This transformation is accompanied by a significant,variation in the optical transmission of the implanted region and results in the formation of an optically active, thermally ''switchable'' surface region on Al2O3. (C) 1996 American Institute of Physics. RP Gea, LA (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 15 TC 43 Z9 43 U1 2 U2 12 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1996 VL 68 IS 22 BP 3081 EP 3083 DI 10.1063/1.116429 PG 3 WC Physics, Applied SC Physics GA UM643 UT WOS:A1996UM64300007 ER PT J AU Blum, O Geib, KM Hafich, MJ Klem, JF Ashby, CIH AF Blum, O Geib, KM Hafich, MJ Klem, JF Ashby, CIH TI Wet thermal oxidation of AlAsSb lattice matched to InP for optoelectronic applications SO APPLIED PHYSICS LETTERS LA English DT Article ID NATIVE-OXIDE; HETEROSTRUCTURE LASER; GAAS AB We demonstrate wet thermal oxidation of an AlAsSb layer lattice matched to an InP substrate. Oxidation in an TnGaAs/AlAsSb/InGaAs structure proceeds in a lateral direction, producing an oxide layer embedded between two layers of InGaAs. Auger analysis and Raman spectroscopy indicate conversion of the AlAsSb into an aluminum oxide with an elemental antimony layer at the top oxide-InGaAs interface. Scanning electron microscope cross-sectional views of partially and fully oxidized samples are also presented. RP Blum, O (reprint author), SANDIA NATL LABS,POB 5800,MS0603,ALBUQUERQUE,NM 87185, USA. NR 21 TC 27 Z9 27 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1996 VL 68 IS 22 BP 3129 EP 3131 DI 10.1063/1.115800 PG 3 WC Physics, Applied SC Physics GA UM643 UT WOS:A1996UM64300023 ER PT J AU Micic, OI Sprague, J Lu, ZH Nozik, AJ AF Micic, OI Sprague, J Lu, ZH Nozik, AJ TI Highly efficient band-edge emission from InP quantum dots SO APPLIED PHYSICS LETTERS LA English DT Article ID LUMINESCENCE PROPERTIES; WELL WIRES; ELECTRON; PHOTOLUMINESCENCE; ABSORPTION; SYSTEMS; TRAPS; CDS AB High quality InP quantum dots with diameters ranging from 25 to 45 Angstrom, have been prepared; these quantum dots (QDs) show high quantum yields for band-edge photoluminescence (lowest energy HOMO-LUMO transition). The wavelength of the blue-shifted band-edge emission ranges from about 575 to 730 nm depending on QD size. The quantum yield for photoluminescence is 30% at 300 K and 60% at 10 K; the multiexponential decay of this emission exhibits lifetimes ranging from 5 to 50 ns. Deep red-shifted emission due to trapping of carriers in defect states on the QD surface which exhibits lifetimes above 500 ns, has been eliminated by treating the QDs with a dilute solution of HF or NH4F. (C) 1996 American Institute of Physics. RP Micic, OI (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 21 TC 163 Z9 163 U1 1 U2 30 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1996 VL 68 IS 22 BP 3150 EP 3152 PG 3 WC Physics, Applied SC Physics GA UM643 UT WOS:A1996UM64300030 ER PT J AU Lee, H Jones, ED AF Lee, H Jones, ED TI Dielectric function of biaxially strained silicon layer SO APPLIED PHYSICS LETTERS LA English DT Article ID ALLOYS AB Dielectric functions of strained silicon layers grown on very thick, relaxed Si1-xGex (x=0.115, 0.3, and 0.37) layers are presented. The effect of tetragonal biaxial strain to the dielectric function is observed to be large near the E(1) gap region. We compare the strain-induced change in the dielectric function of silicon layers with that of SiGe layers and the elasto-optical (or piezo-optical) constants of silicon which were measured from bulk Si under uniaxial compressive Stress. (C) 1996 American Institute of Physics. C1 KYUNG HEE UNIV,DEPT PHYS,SUWON 449701,SOUTH KOREA. RP Lee, H (reprint author), SANDIA NATL LABS,DEPT 1113,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 16 TC 11 Z9 11 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1996 VL 68 IS 22 BP 3153 EP 3155 DI 10.1063/1.115808 PG 3 WC Physics, Applied SC Physics GA UM643 UT WOS:A1996UM64300031 ER PT J AU Cess, RD Zhang, MH Ingram, WJ Potter, GL Alskseev, V Barker, HW Cohen-Solal, E Colman, RA Dazlich, DA Del Genio, AD Dix, MR Dymnikov, V Esch, M Fowler, LD Fraser, JR Galin, V Gates, WL Hack, JJ Kiehl, JT Le Treut, H Lo, KKW McAvaney, BJ Meleshko, VP Morcrette, JJ Randall, DA Roeckner, E Royer, JF Schlesinger, ME Sporyshev, PV Timbal, B Volodin, EM Taylor, KE Wang, W Wetherald, RT AF Cess, RD Zhang, MH Ingram, WJ Potter, GL Alskseev, V Barker, HW Cohen-Solal, E Colman, RA Dazlich, DA Del Genio, AD Dix, MR Dymnikov, V Esch, M Fowler, LD Fraser, JR Galin, V Gates, WL Hack, JJ Kiehl, JT Le Treut, H Lo, KKW McAvaney, BJ Meleshko, VP Morcrette, JJ Randall, DA Roeckner, E Royer, JF Schlesinger, ME Sporyshev, PV Timbal, B Volodin, EM Taylor, KE Wang, W Wetherald, RT TI Cloud feedback in atmospheric general circulation models: An update SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID RADIATION BUDGET EXPERIMENT; CLIMATE FEEDBACK AB Six years ago, we compared the climate sensitivity of 19 atmospheric general circulation models and found a roughly threefold variation among the models; most of this variation was attributed to differences in the models' depictions of cloud feedback. In an update of this comparison, current models showed considerably smaller differences in net cloud feedback, with most producing modest values. There are, however, substantial differences in the feedback components, indicating that the models still have physical disagreements. C1 SUNY STONY BROOK, MARINE SCI RES CTR, INST TERR & PLANETARY ATMOSPHERES, STONY BROOK, NY 11794 USA. RUSSIAN ACAD SCI, DEPT NUMER MATH, MOSCOW 117334, RUSSIA. CANADIAN CLIMATE CTR, DOWNSVIEW, ON M3H 5T4, CANADA. METEOROL DYNAM LAB, F-75231 PARIS 05, FRANCE. BUR METEOROL, RES CTR, MELBOURNE, VIC 3001, AUSTRALIA. COLORADO STATE UNIV, FT COLLINS, CO 80523 USA. NASA, GODDARD INST SPACE STUDIES, NEW YORK, NY 10025 USA. CSIRO, DIV ATMOSPHER RES, MORDIALLOC, VIC 3195, AUSTRALIA. MAX PLANCK INST METEOROL, D-20146 HAMBURG, GERMANY. LAWRENCE LIVERMORE NATL LAB, PROGRAM CLIMATE MODEL DIAGNOSIS & INTERCOMPARISON, LIVERMORE, CA 94550 USA. NATL CTR ATMOSPHER RES, BOULDER, CO 80307 USA. METEOROL OFF, HADLEY CTR CLIMATE PREDICT & RES, BRACKNELL RG12 2SY, BERKS, ENGLAND. METEO FRANCE, CTR NATL RECH METEOROL, F-31057 TOULOUSE, FRANCE. VOEIKOV MAIN GEOPHYS OBSERV, ST PETERSBURG 194018, RUSSIA. EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS, READING RG2 9AX, BERKS, ENGLAND. UNIV ILLINOIS, DEPT ATMOSPHER SCI, URBANA, IL 61801 USA. PRINCETON UNIV, NOAA, GEOPHYS FLUID DYNAM LAB, PRINCETON, NJ 08540 USA. RI alexeev, vladimir/B-2234-2010; Taylor, Karl/F-7290-2011; Del Genio, Anthony/D-4663-2012; Dix, Martin/A-2334-2012; Meleshko, Valentin/D-2157-2016; Randall, David/E-6113-2011; Sporyshev, Petr/P-7323-2015 OI alexeev, vladimir/0000-0003-3519-2797; Taylor, Karl/0000-0002-6491-2135; Del Genio, Anthony/0000-0001-7450-1359; Dix, Martin/0000-0002-7534-0654; Randall, David/0000-0001-6935-4112; Sporyshev, Petr/0000-0002-4047-8178 NR 8 TC 216 Z9 223 U1 2 U2 24 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAY 27 PY 1996 VL 101 IS D8 BP 12791 EP 12794 DI 10.1029/96JD00822 PG 4 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA UN379 UT WOS:A1996UN37900001 ER PT J AU Leung, LR Wigmosta, MS Ghan, SJ Epstein, DJ Vail, LW AF Leung, LR Wigmosta, MS Ghan, SJ Epstein, DJ Vail, LW TI Application of a subgrid orographic precipitation surface hydrology scheme to a mountain watershed SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID PARAMETERIZATION; SENSITIVITY; MODELS AB A regional climate model including a physically based parameterization of the subgrid effects of topography on clouds and precipitation is driven by observed meteorology on its lateral boundaries for a period of 12 months. The meteorology simulated by the model for each subgrid elevation class is distributed across a mountain watershed according to the surface elevation within the watershed. The simulated meteorology is used to drive a detailed model of hydrology-vegetation dynamics at the topographic scale described by digital elevation data, 180 m. The watershed model, which includes a two-layer canopy model for evapotranspiration, an energy-balance model for snow accumulation and melt, a two-layer rooting zone model, and a quasi-three-dimensional saturated subsurface flow model, is used to simulate the seasonal cycle of the accumulation and melt of snow and the accumulation and discharge of surface water within a mountain watershed in northwestern Montana. Comparisons between. the simulated and the recorded snow cover and river discharge at the base of the watershed indicate comparable if not better agreement than between the recorded fields and those simulated by the watershed model driven by meteorology observed at two stations within the watershed. The agreement with the recorded discharge, precipitation, and snow water equivalent is also clearly superior to simulations driven by the regional climate model run without the subgrid parameterization but with one-third the grid size of the simulation with the subgrid parameterization. RP Leung, LR (reprint author), PACIFIC NW NATL LAB, POB 999, K9-30, RICHLAND, WA 99352 USA. RI Ghan, Steven/H-4301-2011 OI Ghan, Steven/0000-0001-8355-8699 NR 24 TC 47 Z9 52 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAY 27 PY 1996 VL 101 IS D8 BP 12803 EP 12817 DI 10.1029/96JD00441 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA UN379 UT WOS:A1996UN37900003 ER PT J AU Langanke, K Dean, DJ Radha, PB Koonin, SE AF Langanke, K Dean, DJ Radha, PB Koonin, SE TI Temperature dependence of pair correlations in nuclei in the iron region SO NUCLEAR PHYSICS A LA English DT Article ID SHELL-MODEL; HOT NUCLEI; DEFORMATION; STRENGTH AB We use the shell-model Monte Carlo approach to study thermal properties and pair correlations in Fe-54,Fe-56,Fe-58 and in Cr-56, The calculations are performed with the modified Kuo-Brown interaction in the complete 1p0f model space. We find generally that the proton-proton and neutron-neutron J = 0 pairing correlations, which dominate the ground-state properties of even-even nuclei, vanish at temperatures around 1 MeV, This pairing phase transition is accompanied by a rapid increase in the moment of inertia and a partial unquenching of the M1 strength, We find that the M1 strength totally unquenches at higher temperatures, related to the vanishing of isoscalar proton-neutron correlations, which persist to higher temperatures than the pairing between like nucleons. The Gamow-Teller strength is also correlated to the isoscalar proton-neutron pairing and hence also unquenches at a temperature larger than that of the pairing phase transition. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP Langanke, K (reprint author), CALTECH,WK KELLOGG RADIAT LAB,106-38,PASADENA,CA 91125, USA. OI Dean, David/0000-0002-5688-703X NR 27 TC 26 Z9 26 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 MAY 27 PY 1996 VL 602 IS 2 BP 244 EP 262 DI 10.1016/0375-9474(96)00139-X PG 19 WC Physics, Nuclear SC Physics GA UX603 UT WOS:A1996UX60300007 ER PT J AU Coriano, C White, AR AF Coriano, C White, AR TI Gauge theory high-energy behavior from j-plane unitarity SO NUCLEAR PHYSICS B LA English DT Article ID POMERANCHUK SINGULARITY; S APPROXIMATION; QCD; POMERON AB In a non-abelian gauge theory the t-channel multiparticle unitarity equations continued in the complex j-plane can be systematically expanded around j = 1 and t = 0. The combination of Ward identity constraints with unitarity is sufficient to produce directly many of the results obtained by Regge limit leading-log and next-to-leading log momentum-space calculations. The O(g(2)) BFKL kernel is completely determined. O(g(4)) infrared contributions to this kernel are also obtained, including the leading contribution of a new partial-wave amplitude-previously identified as a separate forward component with a holomorphically factorizable spectrum. For this amplitude the only scale ambiguity is the overall normalization and it is anticipated to be a new conformally invariant kernel. While scale-dependent non-leading reggeon interactions can not be derived by the techniques developed, it is conjectured that all conformally invariant interactions may be determined by t-channel unitarity. C1 UNIV FLORIDA,DEPT PHYS,INST FUNDAMENTAL THEORY,GAINESVILLE,FL 32611. RP Coriano, C (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. OI Coriano', Claudio/0000-0003-0479-8075 NR 43 TC 9 Z9 9 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 MAY 27 PY 1996 VL 468 IS 1-2 BP 175 EP 218 DI 10.1016/0550-3213(95)00129-8 PG 44 WC Physics, Particles & Fields SC Physics GA UU662 UT WOS:A1996UU66200009 ER PT J AU Coriano, C Parwani, RR White, AR AF Coriano, C Parwani, RR White, AR TI Scale-invariant O(g(4)) Lipatov kernels at non-zero momentum transfer SO NUCLEAR PHYSICS B LA English DT Article AB We summarize recent work on the evaluation of the scale-invariant next-to-leading order Lipatov kernel, constructed via transverse momentum diagrams. At zero momentum transfer the square of the leading-order kernel appears together with an additional component, now identified as a new partial-wave amplitude, having a separate, holomorphically factorizable, spectrum. We present a simplified expression for the full kernel at non-zero momentum transfer and give a complete analysis of its infrared properties. We also construct a non-forward extension of the new amplitude which is infrared finite and satisfies Ward identity constraints. We conjecture that this new kernel has the conformal invariance properties corresponding to the holomorphic factorization of the forward spectrum. C1 UNIV FLORIDA,DEPT PHYS,INST FUNDAMENTAL THEORY,GAINESVILLE,FL 32611. INST PHYS,BHUBANESWAR 751005,ORISSA,INDIA. RP Coriano, C (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. OI Coriano', Claudio/0000-0003-0479-8075 NR 12 TC 2 Z9 2 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 MAY 27 PY 1996 VL 468 IS 1-2 BP 219 EP 240 DI 10.1016/0550-3213(96)00111-3 PG 22 WC Physics, Particles & Fields SC Physics GA UU662 UT WOS:A1996UU66200010 ER PT J AU Bartelt, J Csorna, SE Jain, V Marka, S Freyberger, A Gibaut, D Kinoshita, K Pomianowski, P Schrenk, S Cinabro, D Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Athanas, M Bliss, DW Brower, WS Masek, G Paar, HP Gronberg, J Korte, CM Kutschke, R Menary, S Morrison, RJ Nakanishi, S Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Tajima, H Witherell, MS Balest, R Cho, K Ford, WT Lohner, M Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Dumas, DJ Ehrlich, R Elia, R Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Jones, CD Jones, SL Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Avery, P Prescott, C Yang, S Yelton, J Brandenburg, G Briere, RA Liu, T Saulnier, M Wilson, R Yamamoto, H Browder, TE Li, F Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Palmer, M Selen, M Thaler, JJ Edwards, KW McLean, KW Ogg, M Bellerive, A Britton, DI Janicek, R MacFarlane, DB Patel, PM Spaan, B Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Copty, N Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Nelson, JK Patton, S Poling, R Riehle, T Savinov, V Alam, MS Kim, IJ Ling, Z Mahmood, AH ONeill, JJ Severini, H Sun, CR Timm, S Wappler, F Duboscq, JE Fulton, R Fujino, D Gan, KK Honscheid, K Kagan, H Kass, R Lee, J Sung, M Undrus, A White, C Wanke, R Wolf, A Zoeller, MM Fu, X Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Miao, T Miller, DH Modesitt, M Shibata, EI Shipsey, IPJ Wang, PN Yurko, M Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Wang, R Coan, TE Dominick, J Fadeyev, V Korolkov, I Lambrecht, M Sanghera, S Shelkov, V Stroynowski, R Volobouev, I Wei, G Artuso, M Efimov, A Gao, M Goldberg, M Greene, R He, D Horwitz, N Kopp, S Moneti, GC Mountain, R Mukhin, Y Playfer, S Skwarnicki, T Stone, S Xing, X AF Bartelt, J Csorna, SE Jain, V Marka, S Freyberger, A Gibaut, D Kinoshita, K Pomianowski, P Schrenk, S Cinabro, D Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Athanas, M Bliss, DW Brower, WS Masek, G Paar, HP Gronberg, J Korte, CM Kutschke, R Menary, S Morrison, RJ Nakanishi, S Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Tajima, H Witherell, MS Balest, R Cho, K Ford, WT Lohner, M Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Dumas, DJ Ehrlich, R Elia, R Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Jones, CD Jones, SL Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Avery, P Prescott, C Yang, S Yelton, J Brandenburg, G Briere, RA Liu, T Saulnier, M Wilson, R Yamamoto, H Browder, TE Li, F Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Palmer, M Selen, M Thaler, JJ Edwards, KW McLean, KW Ogg, M Bellerive, A Britton, DI Janicek, R MacFarlane, DB Patel, PM Spaan, B Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Copty, N Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Nelson, JK Patton, S Poling, R Riehle, T Savinov, V Alam, MS Kim, IJ Ling, Z Mahmood, AH ONeill, JJ Severini, H Sun, CR Timm, S Wappler, F Duboscq, JE Fulton, R Fujino, D Gan, KK Honscheid, K Kagan, H Kass, R Lee, J Sung, M Undrus, A White, C Wanke, R Wolf, A Zoeller, MM Fu, X Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Miao, T Miller, DH Modesitt, M Shibata, EI Shipsey, IPJ Wang, PN Yurko, M Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Wang, R Coan, TE Dominick, J Fadeyev, V Korolkov, I Lambrecht, M Sanghera, S Shelkov, V Stroynowski, R Volobouev, I Wei, G Artuso, M Efimov, A Gao, M Goldberg, M Greene, R He, D Horwitz, N Kopp, S Moneti, GC Mountain, R Mukhin, Y Playfer, S Skwarnicki, T Stone, S Xing, X TI First observation of the decay tau(-)->K-eta nu(tau) SO PHYSICAL REVIEW LETTERS LA English DT Article ID MONTE-CARLO; TAU-DECAYS; LIBRARY; MASS AB The decay tau(-) --> K- eta nu(tau), has been observed with the CLEO II detector. The eta meson is reconstructed using two decay channels, eta --> gamma gamma and pi(+)pi(-)pi(0). The measured branching fraction is B(tau(-) --> K- eta nu(tau)) = (2.6 +/- 0.5 +/- 0.4) x 10(-4), somewhat higher than theoretical estimates. An improved upper limit for the second-class-current decay tau(-) --> pi(-) eta nu(tau) is set, B(tau(-) --> pi(-) eta nu(tau)) < 1.4 x 10(-4) at 95% C.L., consistent with theoretical expectations. C1 VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. WAYNE STATE UNIV,DETROIT,MI 48202. CALTECH,PASADENA,CA 91125. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV COLORADO,BOULDER,CO 80309. CORNELL UNIV,ITHACA,NY 14853. UNIV FLORIDA,GAINESVILLE,FL 32611. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV HAWAII MANOA,HONOLULU,HI 96822. UNIV ILLINOIS,URBANA,IL 61801. CARLETON UNIV,OTTAWA,ON K1S 5B6,CANADA. INST PARTICLE PHYS,MONTREAL,PQ,CANADA. MCGILL UNIV,MONTREAL,PQ H3A 2T8,CANADA. ITHACA COLL,ITHACA,NY 14850. UNIV KANSAS,LAWRENCE,KS 66045. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. SUNY ALBANY,ALBANY,NY 12222. OHIO STATE UNIV,COLUMBUS,OH 43210. UNIV OKLAHOMA,NORMAN,OK 73019. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. SO METHODIST UNIV,DALLAS,TX 75275. SYRACUSE UNIV,SYRACUSE,NY 13244. RP Bartelt, J (reprint author), VANDERBILT UNIV,NASHVILLE,TN 37235, USA. RI Schaffner, Stephen/D-1189-2011; Britton, David/F-2602-2010; Briere, Roy/N-7819-2014 OI Britton, David/0000-0001-9998-4342; Briere, Roy/0000-0001-5229-1039 NR 14 TC 44 Z9 45 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1996 VL 76 IS 22 BP 4119 EP 4123 DI 10.1103/PhysRevLett.76.4119 PG 5 WC Physics, Multidisciplinary SC Physics GA UM245 UT WOS:A1996UM24500005 ER PT J AU Lihn, HC Kung, P Settakorn, C Wiedemann, H Bocek, D Hernandez, M AF Lihn, HC Kung, P Settakorn, C Wiedemann, H Bocek, D Hernandez, M TI Observation of stimulated transition radiation SO PHYSICAL REVIEW LETTERS LA English DT Article ID COHERENT AB Stimulated, coherent transition radiation (STR) has been observed at the Stanford SUNSHINE facility. Far-infrared light pulses of coherent transition radiation emitted from femtosecond electron bunches are recycled in a special cavity to arrive back at the radiator coincident with subsequent incoming electron bunches. This overlap enables the electrons to do work on the electromagnetic field, thus stimulating the emission of more radiated energy than would be possible without this external held. The experimental setup to observe STR via cavity detuning measurements and experimental results is discussed. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94309. RP Lihn, HC (reprint author), STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94309, USA. NR 8 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1996 VL 76 IS 22 BP 4163 EP 4166 DI 10.1103/PhysRevLett.76.4163 PG 4 WC Physics, Multidisciplinary SC Physics GA UM245 UT WOS:A1996UM24500016 ER PT J AU Mauri, F Louie, SG AF Mauri, F Louie, SG TI Magnetic susceptibility of insulators from first principles SO PHYSICAL REVIEW LETTERS LA English DT Article ID TETRAHEDRAL SEMICONDUCTORS AB We present an ab initio approach for the computation of the magnetic susceptibility chi of insulators. The approach is applied to compute chi in diamond and in solid neon using density functional theory in the local density approximation, obtaining good agreement with experimental data. In solid neon, we predict an observable dependence of chi upon pressure. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP Mauri, F (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI mauri, francesco/K-5726-2012 OI mauri, francesco/0000-0002-6666-4710 NR 14 TC 46 Z9 46 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 MAY 27 PY 1996 VL 76 IS 22 BP 4246 EP 4249 DI 10.1103/PhysRevLett.76.4246 PG 4 WC Physics, Multidisciplinary SC Physics GA UM245 UT WOS:A1996UM24500037 ER PT J AU Jacobsen, FM Lynn, KG AF Jacobsen, FM Lynn, KG TI Positron quantum reflection in thin metal films and efficient generation of high brightness low energy positron beams at 4.2 K SO PHYSICAL REVIEW LETTERS LA English DT Article ID REEMISSION MICROSCOPE; SURFACES; RESOLUTION AB High energy positrons implanted into a metal having a negative positron affinity, phi(+), can be reemitted into vacuum with an energy equal to -phi(+) smeared by the thermal energy. Reduction of the temperature to 4.2 K to increase the brightness of the reemitted positrons is normally offset by a loss of emission efficiency due to the quantum mechanical reflection at the metal-vacuum interface, approaching unity as the temperature is reduced to zero. By using a thin moderator (0.1 mu m), the quantum reflection is compensated by multiple encounters with the surface, resulting in on efficient high brightness low energy positron moderator. Our results show that efficient accumulation of positrons at 4.2 K necessary for the formation of antihydrogen can be done if a thin metal film is used to moderate the positrons. RP Jacobsen, FM (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 19 TC 2 Z9 2 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 MAY 27 PY 1996 VL 76 IS 22 BP 4262 EP 4264 DI 10.1103/PhysRevLett.76.4262 PG 3 WC Physics, Multidisciplinary SC Physics GA UM245 UT WOS:A1996UM24500041 ER PT J AU Olson, CG Benning, PJ Schmidt, M Lynch, DW Canfield, PC Wieliczka, DM AF Olson, CG Benning, PJ Schmidt, M Lynch, DW Canfield, PC Wieliczka, DM TI Valence-band dispersion in angle-resolved resonant photoemission from LaSb SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHOTOABSORPTION AB Angle-resolved photoemission spectra taken on single crystals of LaSb at the La 4d --> 4f resonance show dispersion of resonantly emitted valence-band electrons. This is the first direct demonstration that the Bloch component of valence states participates in resonant photoemission. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. UNIV MISSOURI, DEPT PHYS, KANSAS CITY, MO 64110 USA. RP Olson, CG (reprint author), IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. RI Canfield, Paul/H-2698-2014 NR 23 TC 34 Z9 34 U1 3 U2 7 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 MAY 27 PY 1996 VL 76 IS 22 BP 4265 EP 4268 DI 10.1103/PhysRevLett.76.4265 PG 4 WC Physics, Multidisciplinary SC Physics GA UM245 UT WOS:A1996UM24500042 ER PT J AU Johnson, MB Satchler, GR AF Johnson, MB Satchler, GR TI Characteristics of local pion-nucleus potentials that are equivalent to Kisslinger-type potentials SO ANNALS OF PHYSICS LA English DT Article ID CHARGE-EXCHANGE SCATTERING; LOW-ENERGY PIONS; ELASTIC-SCATTERING; RESONANCE REGION; UNIFIED ANALYSIS; SINGLE; DEPENDENCE AB The Krell-Ericson transformation provides a local potential that is exactly equivalent to the nonlocal Kisslinger-type potential. The associated scattering wave functions are related by a Perey factor. We examine the properties of examples of these local potentials, based upon low-order multiple scattering theory, at energies ranging from 20 to 291 MeV. The radial shapes of the potentials may display considerable structure in the nuclear surface. The general characteristics of the local real potentials reproduce the live features identified by Friedman from his model-independent analysis of pion scattering data The Perey factors show a simple, mostly monotonic, behavior. (C) 1996 Academic Press, Inc. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP Johnson, MB (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 37 TC 28 Z9 28 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD MAY 25 PY 1996 VL 248 IS 1 BP 134 EP 169 DI 10.1006/aphy.1996.0054 PG 36 WC Physics, Multidisciplinary SC Physics GA UU128 UT WOS:A1996UU12800007 ER PT J AU Chang, J Brown, NJ AF Chang, J Brown, NJ TI Sensitivity of the product vibrational distribution of the F+H-2 reaction to the T5A potential energy surface SO CHEMICAL PHYSICS LETTERS LA English DT Article ID KOHN VARIATIONAL PRINCIPLE; INTEGRAL CROSS-SECTIONS; TRANSITION-STATE THEORY; LOG DERIVATIVE VERSION; CONVERGED QUANTUM; SCATTERING; F+H-2->HF+H; EXPANSION AB Sensitivities for the transition probability of the F + H-2 (upsilon = 0, j = 0) -->, HF (upsilon')+ H reaction are calculated for total angular momentum J = 0 to determine how the T5A potential energy surface (PES) can be modified to correct its theoretical product vibrational branching ratio. Several modifications of the T5A PES are suggested and compared with the actual PES modifications that have led to the newer 5SEC and 6SEC surfaces. It is seen that the 6SEC surface is substantially better than 5SEC which, in rum, is better than T5A with respect to the suggested PES modifications. The match is not perfect and one can contemplate using the sensitivities for other PES refinements that would lead to even better agreement with experiment. RP Chang, J (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 36 TC 4 Z9 4 U1 1 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 MAY 24 PY 1996 VL 254 IS 3-4 BP 147 EP 157 DI 10.1016/0009-2614(96)00286-2 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UN722 UT WOS:A1996UN72200002 ER PT J AU Cahill, PA AF Cahill, PA TI Ab initio computational study of selected C60H6 isomers SO CHEMICAL PHYSICS LETTERS LA English DT Article AB The relative energies of 18 isomers of C60H6 have been determined through geometry-optimized ab initio calculations. HF/6-31G* computations on the two lowest energy structures determined at the HF/3-21G level indicate that 1,2,4,11,15,30-C60H6 (18, with a C60Br6-like structure) lies only 0.4 kcal/mol higher in energy than 1,2,3,4,9,10-C60H6 (4). This remarkably close energy spacing was unexpected because, unlike in 4 in which addition occurs exclusively to 6,6 ring fusions, H-2 addition in 18 occurs both 1,2 to a 6,6 ring fusion and 1,4 across 6-rings so as to place two double bonds into 6,5 ring fusions. RP Cahill, PA (reprint author), SANDIA NATL LABS,CHEM ORGAN MAT,ALBUQUERQUE,NM 87185, USA. NR 10 TC 24 Z9 24 U1 0 U2 1 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 MAY 24 PY 1996 VL 254 IS 3-4 BP 257 EP 262 DI 10.1016/0009-2614(96)00294-1 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UN722 UT WOS:A1996UN72200016 ER PT J AU Staerk, DU Shitangkoon, A Winchester, E Vigh, G Felinger, A Guiochon, G AF Staerk, DU Shitangkoon, A Winchester, E Vigh, G Felinger, A Guiochon, G TI Use of the equilibrium-dispersive model of nonlinear gas chromatography for the modelling of the elution band profiles in the preparative-scale gas chromatographic separation of enantiomers SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE enantiomer separation; preparative chromatography; equilibrium dispersive model; band profiles; adsorption isotherms; nonlinear chromatography; methyl chloropropionate AB The equilibrium-dispersive model of chromatography is applied to the study of enantioselective separations of methyl 2-chloropropionate in gas chromatography. The single-component and competitive bi-Langmuir isotherm equations that describe the sorption behavior of single enantiomers and racemates, respectively, are utilized by the equilibrium-dispersive model to predict the elution band profiles of single-component and binary mixture samples. The measured and the calculated band profiles are compared both for the analytical open tubular column used to acquire the isotherm data and for the 1 mX22.5 mm I.D. preparative packed column, followed by the comparison of the enantiomeric purity vs. production curves for both the measured and the simulated systems. C1 TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Felinger, Attila/A-1595-2008 OI Felinger, Attila/0000-0001-7130-1968 NR 17 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAY 24 PY 1996 VL 734 IS 2 BP 289 EP 296 DI 10.1016/0021-9673(96)00058-1 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UU612 UT WOS:A1996UU61200008 ER PT J AU Zhang, LL Yeung, ES AF Zhang, LL Yeung, ES TI Postcolumn reactor in capillary electrophoresis for laser-induced fluorescence detection SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE postcolumn reactor; laser-induced fluorescence detection; erythrocytes; derivatization, electrophoresis; detection, electrophoresis; amines; amino acids; proteins ID ZONE ELECTROPHORESIS; ORTHO-PHTHALDIALDEHYDE; NATIVE PROTEINS AB The construction and utility of a postcolumn reactor in capillary electrophoresis using o-phthaldialdehyde/2-mercaptoethanol (OPA/2-ME) as the fluorescent labeling reagent and laser-induced fluorescence detection are described. The reactor is based on a coaxial design consisting of two narrow-bore capillaries. The reagent is electroosmotically pumped into the reaction capillary and the flow is controlled independently by a separate high-voltage power supply. The response is linear over at least two orders of magnitude. Mass limits of detection are in the low attomole range for various amines, amino acids and proteins. The suitability of the system for single-cell studies is demonstrated with human erythrocytes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 40 TC 46 Z9 49 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAY 24 PY 1996 VL 734 IS 2 BP 331 EP 337 DI 10.1016/0021-9673(95)01305-9 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UU612 UT WOS:A1996UU61200013 ER PT J AU Cruz, SL Villarreal, JE Volkow, ND AF Cruz, SL Villarreal, JE Volkow, ND TI Further evidence that naloxone acts as an inverse opiate agonist: Implications for drug dependence and withdrawal SO LIFE SCIENCES LA English DT Letter DE opioids; naloxone; inverse agonist; dependence; withdrawal; abstinence; H7; H8 ID GUINEA-PIG ILEUM; ABSTINENCE RESPONSES; RECEPTOR; BINDING; INVITRO; NAIVE AB To test if naloxone behaved as an inverse agonist rather than as an antagonist we evaluated its responses in guinea-pig ilea with and without morphine (480 nM, 24 h). In control ilea, naloxone (100 nM) had no effect. In morphine-treated ilea, naloxone as a bolus, but not as an infusion, elicited an abstinence response. Preadministration of naloxone blocked the response to subsequent administrations. Similarly, naloxone failed to produce an abstinence response in ilea pretreated with kappa compounds (bremazocine, U50488 or xorphanol 100 nM) or with kinase inhibitors (H7 or H8 30 mu M). These findings can be interpreted in the light of the two-state receptor model if naloxone behaves as an inverse agonist: Incubation with morphine increased the active state of receptors making them susceptible to the inverse agonist (naloxone); exposure to naloxone favored the inactive conformation making them insensitive to further administration of naloxone; kappa compounds behaved as antagonists preventing the response to naloxone; and kinase inhibitors interfered with the active conformation making the system insensitive to naloxone. According to this model, dependence can be viewed as an overexpression of the active receptors and withdrawal as an abrupt change from the active to the inactive state. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP Cruz, SL (reprint author), IPN,CINVESTAV,SECC TERAPEUT EXPTL,APARTADO POSTAL 22026,MEXICO CITY 14000,DF,MEXICO. NR 26 TC 12 Z9 13 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0024-3205 J9 LIFE SCI JI Life Sci. PD MAY 24 PY 1996 VL 58 IS 26 BP PL381 EP PL389 PG 9 WC Medicine, Research & Experimental; Pharmacology & Pharmacy SC Research & Experimental Medicine; Pharmacology & Pharmacy GA UN027 UT WOS:A1996UN02700011 ER PT J AU Schwartz, SE Andreae, MO AF Schwartz, SE Andreae, MO TI Uncertainty in climate change caused by aerosols SO SCIENCE LA English DT Editorial Material ID FEEDBACK C1 MAX PLANCK INST CHEM, DEPT BIOGEOCHEM, D-55020 MAINZ, GERMANY. RP Schwartz, SE (reprint author), BROOKHAVEN NATL LAB, ENVIRONM CHEM DIV, UPTON, NY 11973 USA. RI Schwartz, Stephen/C-2729-2008; Andreae, Meinrat/B-1068-2008 OI Schwartz, Stephen/0000-0001-6288-310X; Andreae, Meinrat/0000-0003-1968-7925 NR 13 TC 103 Z9 116 U1 2 U2 13 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 MAY 24 PY 1996 VL 272 IS 5265 BP 1121 EP 1122 DI 10.1126/science.272.5265.1121 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UM889 UT WOS:A1996UM88900033 ER PT J AU Wang, LS Wu, HB Desai, SR Fan, JW Colson, SD AF Wang, LS Wu, HB Desai, SR Fan, JW Colson, SD TI A photoelectron spectroscopic study of small silicon oxide clusters: SiO2, Si2O3, and Si2O4 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ABINITIO SCF-CALCULATIONS; MOLECULES; IONS AB We present an anion photoelectron spectroscopic study of SiO2, Si2O3, and Si2O4. We obtained the photoelectron spectra of these small silicon oxide anion clusters at 4.66 eV photon energy. All the spectra show broad photodetachment features, suggesting that there is considerable geometry change between the anion and the neutral. The vertical detachment energies are determined to be 2.76 (0.10), 2.75 (0.10), and 3.63 (0.1) eV for SiO2-, Si2O3-, and Si2O4-, respectively. The spectrum of Si2O3- shows a weak feature at lower binding energy, suggesting existence of another isomer. The spectra of GeO2- and Ge2O3- are also obtained and are compared to the silicon analogs. They are similar to the silicon oxide species, but both have higher detachment energies, 2.93 (0.07) eV for GeO2- and 3.01 (0.07) eV for Ge2O3-. The Ge2O3- spectrum is consistent with only one isomer. The structure and bonding of these small oxide clusters are discussed. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. RP Wang, LS (reprint author), WASHINGTON STATE UNIV, DEPT PHYS, RICHLAND, WA 99352 USA. NR 29 TC 56 Z9 58 U1 0 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 23 PY 1996 VL 100 IS 21 BP 8697 EP 8700 DI 10.1021/jp9602538 PG 4 WC Chemistry, Physical SC Chemistry GA UM677 UT WOS:A1996UM67700013 ER PT J AU Zachariah, MR Westmoreland, PR Burgess, DR Tsang, W AF Zachariah, MR Westmoreland, PR Burgess, DR Tsang, W TI BAC-MP4 predictions of thermochemical data for C-1 and C-2 stable and radical hydrofluorocarbons and oxidized hydrofluorocarbons SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BOND-DISSOCIATION ENERGIES; VIBRATIONAL FREQUENCIES; THERMODYNAMIC FUNCTIONS; ATMOSPHERIC CHEMISTRY; ABINITIO; COMBUSTION; BARRIERS; ROTATION; HEAT AB An ab initio bond additivity corrected quantum chemistry procedure has been applied to the development of a data base for thermochemistry of C/H/F/O species. This information has been used to construct a chemical kinetic mechanism for the prediction of the behavior of fluorocarbons as flame suppressants, with clear applications to plasma and atmospheric chemistry as well. Bond additivity corrected (BAC) Moller-Plesset fourth-order perturbation theory (MP4) calculations have been performed to obtain a large body of thermochemical data on about 100 closed and open shelled fluorocarbon species, For about 70 of these species, literature values for enthalpies of formation were available for comparison to the calculated values. The average difference between the calculated and literature values was about 9 kJ/mol. The results indicate that the BAC-MP4 procedure can provide energies that are comparable in accuracy to most experimentally derived values, at lower computational costs relative to other more computationally expensive nb Initio molecular orbital methods, This work provides a substantial data base of thermochemical data for fluorinated hydrocarbons constructed in a self-consistent manner. C1 UNIV MASSACHUSETTS,AMHERST,MA 01003. SANDIA NATL LABS,LIVERMORE,CA. RP Zachariah, MR (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 45 TC 119 Z9 123 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 23 PY 1996 VL 100 IS 21 BP 8737 EP 8747 DI 10.1021/jp952467f PG 11 WC Chemistry, Physical SC Chemistry GA UM677 UT WOS:A1996UM67700018 ER PT J AU Baranyai, A Cummings, PT AF Baranyai, A Cummings, PT TI Extremum behavior of fluctuation amplitudes close to equilibrium SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article AB In a previous paper (Phys. Rev. E 1995, 52, 2198) we proposed that the fluctuation amplitudes of equilibrium systems are minimal relative to nearby dissipative nonequilibrium states. This behavior was found in nonequilibrium molecular dynamics calculations at fixed density and kinetic temperature. In this paper we examined this rule at fixed internal energy (microcanonical ensemble) and also for two-dimensional systems. We find that the extremum behavior remains valid despite the change in boundary conditions and system dimensionality. C1 OAK RIDGE NATL LAB, DIV CHEM TECHNOL, OAK RIDGE, TN 37831 USA. EOTVOS LORAND UNIV, LAB THEORET CHEM, H-1518 BUDAPEST 112, HUNGARY. RP Baranyai, A (reprint author), UNIV TENNESSEE, DEPT CHEM ENGN, 419 DOUGHERTY ENGN BLDG, KNOXVILLE, TN 37996 USA. RI Cummings, Peter/B-8762-2013 OI Cummings, Peter/0000-0002-9766-2216 NR 9 TC 1 Z9 1 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 23 PY 1996 VL 100 IS 21 BP 9149 EP 9151 DI 10.1021/jp953724j PG 3 WC Chemistry, Physical SC Chemistry GA UM677 UT WOS:A1996UM67700075 ER PT J AU Milanovich, N Suh, M Jankowiak, R Small, GJ Hayes, JM AF Milanovich, N Suh, M Jankowiak, R Small, GJ Hayes, JM TI Binding of TO-PRO-3 and TOTO-3 to DNA: Fluorescence and hole-burning studies SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SOLUTION CONFORMATION; POLYVINYL-ALCOHOL; ADDUCT STRUCTURE; DIOL EPOXIDE; BENZOPYRENE; INTERCALATION; COMPLEXES; MECHANISM AB The thiazole orange derivative, TO-PRO-3, and its dimeric analogue, TOTO-3, bind strongly to both double- and single-stranded DNA. Both the bound and the free dye undergo efficient nonphotochemical hole burning. From the structure of the hole burned and the fluorescence line-narrowed spectra, it is concluded that there are multiple modes of binding of the dyes to DNA. burned vibronic band structure are similar to those of the free dye. It is proposed that the molecules in this mode are externally bound to the DNA chain. Molecules in the other binding mode are characterized by a strong interaction with DNA. These are proposed to be molecules in intercalated or base-stacked configurations. C1 IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV,AMES LAB,AMES,IA 50011. NR 30 TC 29 Z9 29 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 23 PY 1996 VL 100 IS 21 BP 9181 EP 9186 DI 10.1021/jp9600625 PG 6 WC Chemistry, Physical SC Chemistry GA UM677 UT WOS:A1996UM67700080 ER PT J AU Hooft, RWW Vriend, G Sander, C Abola, EE AF Hooft, RWW Vriend, G Sander, C Abola, EE TI Errors in protein structures SO NATURE LA English DT Letter C1 EMBL EBI,CAMBRIDGE CB10 1RQ,ENGLAND. BROOKHAVEN NATL LAB,DEPT BIOL,PROT DATA BANK,UPTON,NY 11973. RP Hooft, RWW (reprint author), EUROPEAN MOLEC BIOL LAB,MEYERHOFSTR 1,D-69117 HEIDELBERG,GERMANY. RI Hooft, Rob/A-2906-2010; Vriend, Gert/D-6730-2011; sander, chris/H-1452-2011; Vriend, G./H-8112-2014 OI Hooft, Rob/0000-0001-6825-9439; NR 4 TC 1519 Z9 1545 U1 3 U2 26 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAY 23 PY 1996 VL 381 IS 6580 BP 272 EP 272 DI 10.1038/381272a0 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UM403 UT WOS:A1996UM40300022 PM 8692262 ER PT J AU Bucurescu, D Zamfir, NV CataDanil, G Ivascu, M Stroe, L Ur, CA Casten, RF AF Bucurescu, D Zamfir, NV CataDanil, G Ivascu, M Stroe, L Ur, CA Casten, RF TI Global correlations of unique parity structures in odd-A nuclei SO PHYSICS LETTERS B LA English DT Article DE unique parity orbitals; spectra classification; signature splitting AB All known unique parity structures in precollective odd-A nuclei (having cores with E(4(1)(+))/E(2(1)(+)) < 2.0) are shown to behave similarly to the yrast quasibands in the neighboring even-even nuclei. This is interpreted in terms of a pair addition mode. With previous results on collective nuclei, this gives a tripartite classification of the evolution of the unique parity quasibands in odd-A nuclei. A simple index for signature splitting is also developed which avoids the need for complex analysis of Routhian structures. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CLARK UNIV,WORCESTER,MA 01610. YALE UNIV,WNSL,NEW HAVEN,CT 06520. RP Bucurescu, D (reprint author), INST ATOM PHYS,BUCHAREST,ROMANIA. RI Zamfir, Nicolae Victor/F-2544-2011; Stroe, Lucian/A-3290-2009 OI Stroe, Lucian/0000-0002-9306-3937 NR 10 TC 2 Z9 2 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 MAY 23 PY 1996 VL 376 IS 1-3 BP 1 EP 6 DI 10.1016/0370-2693(96)00264-X PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UP619 UT WOS:A1996UP61900001 ER PT J AU Schlei, BR Ornik, U Plumer, M Strottman, D Weiner, RM AF Schlei, BR Ornik, U Plumer, M Strottman, D Weiner, RM TI Hydrodynamical analysis of single inclusive spectra and Bose-Einstein correlations for Pb+Pb at 160 AGeV SO PHYSICS LETTERS B LA English DT Article ID HIGH-ENERGY COLLISIONS; RELATIVISTIC HYDRODYNAMICS; INTERFEROMETRY; EXPANSION AB We present the first analysis of preliminary data for Ph + Ph at 160 AGeV using 3 + I-dimensional relativistic hydrodynamics. We find excellent agreement with the rapidity spectra of negative hadrons and protons and the correlation measurements. The data indicate a large amount of stopping; 65% of the invariant energy of the collision is thermalized and 73% of the baryons are contained in the central fireball, Within our model this implies that a quark-gluon-plasma of lifetime 3.4 fm/c was formed. C1 GSI DARMSTADT,W-6100 DARMSTADT,GERMANY. UNIV MARBURG,DEPT PHYS,W-3550 MARBURG,GERMANY. RP Schlei, BR (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 25 TC 37 Z9 37 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 23 PY 1996 VL 376 IS 1-3 BP 212 EP 219 DI 10.1016/0370-2693(96)00202-X PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UP619 UT WOS:A1996UP61900032 ER PT J AU Dong, ZC Corbett, JD AF Dong, ZC Corbett, JD TI Na23K9Tl153: An unusual zintl compound containing apparent Tl-5(7-), Tl-4(8-), Tl-3(7-), and Tl5- anions SO INORGANIC CHEMISTRY LA English DT Article ID TRANSITION-ELEMENTS; CLUSTERS; PHASES AB Reaction of the neat elements in tantalum containers at 400 degrees C and then 150 degrees C gives the pure title phase. X-ray crystallography shows that the hexagonal structure (P6(3)/mmc, Z = 2, a = 11.235(1) Angstrom, b = 30.133(5) Angstrom) contains relatively high symmetry clusters Tl-5(7-) (D-3h), Tl-4(8-) (C-3v, similar to T-d), and the new Tl-3(7-) (D-infinity h) plus Tl5-, the last two disordered over the same elongated site in 1:2 proportions. Cation solvation of these anions is tight and specific, providing good Coulombic trapping of weakly bound electrons on the isolated cluster anions. The observed disorder makes the compound structurally a Zintl phase with a closed shell electron count. EHMO calculations on the novel Tl-3(7-) reveal some bonding similarities with the isoelectronic CO2, with two good sigma(s,p) bonding and two weakly bonding pi MO's. The Tl-Tl bond lengths therein (3.14 Angstrom) are evidently consistent with multiple bonding. The weak temperature-independent paramagnetism and metallic conductivity (rho(293) similar to 90 mu Omega . cm) of the phase are discussed. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 36 TC 23 Z9 23 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 22 PY 1996 VL 35 IS 11 BP 3107 EP 3112 DI 10.1021/ic960014z PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA UM693 UT WOS:A1996UM69300008 ER PT J AU Sun, HZ Mezei, M Fye, R Benham, C AF Sun, HZ Mezei, M Fye, R Benham, C TI Monte Carlo analysis of conformational transitions in superhelical DNA (vol 103, pg 8653, 1995) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Correction, Addition C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP Sun, HZ (reprint author), CUNY MT SINAI SCH MED,DEPT BIOMATH SCI,NEW YORK,NY 10029, USA. RI Benham, Craig/G-1512-2013 NR 1 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 22 PY 1996 VL 104 IS 20 BP 8173 EP 8173 DI 10.1063/1.471828 PG 1 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UL125 UT WOS:A1996UL12500044 ER PT J AU Kuziemko, GM Stroh, M Stevens, RC AF Kuziemko, GM Stroh, M Stevens, RC TI Cholera toxin binding affinity and specificity for gangliosides determined by surface plasmon resonance SO BIOCHEMISTRY LA English DT Article ID MEMBRANE-RECEPTORS; ESCHERICHIA-COLI; GM1 GANGLIOSIDE; ENTERO-TOXIN; OLIGOSACCHARIDE; DERIVATIVES; SYSTEM AB The present study determines the affinity of cholera toxin for the ganglioside series GM1, GM2, GM3, GD1A, GD1B, GT1B, asialo GM1, globotriosyl ceramide, and lactosyl ceramide using real time biospecific interaction analysis (surface plasmon resonance, SPR). SPR shows that cholera toxin preferably binds to gangliosides in the following sequence: GM1 > GM2 > GD1A > GM3 > GT1B > GD1B > asialo-GM1. The measured binding affinity of cholera toxin for the ganglioside sequence ranges from 4.61 x 10(-12) M for GM1 to 1.88 x 10(-10) M for asialo GM1. The picomolar values obtained by surface plasmon resonance are similar to K-d values determined with whole-cell binding assays. Both whole-cell assays and SPR measurements on synthetic membranes are higher than free solution measurements by several orders of magnitude. This difference may be caused by the effects of avidity and charged lipid head-groups, which may play a major role in the binding between cholera toxin, the receptor, and the membrane surface. The primary difference between free solution binding studies and surface plasmon resonance studies is that the latter technique is performed on surfaces resembling the cell membrane. Surface plasmon resonance has the further advantage of measuring apparent kinetic association and dissociation rates in real time, providing direct information about binding events at the membrane surface. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. RI Stevens, Raymond/K-7272-2015 OI Stevens, Raymond/0000-0002-4522-8725 NR 34 TC 221 Z9 226 U1 2 U2 23 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 21 PY 1996 VL 35 IS 20 BP 6375 EP 6384 DI 10.1021/bi952314i PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UM512 UT WOS:A1996UM51200027 PM 8639583 ER PT J AU Wu, RL Hernandez, G Odom, JD Dunlap, RB Silks, LA AF Wu, RL Hernandez, G Odom, JD Dunlap, RB Silks, LA TI Simple enantiomeric excess determination of amines using chiral selones: Unusual N-H Se bonding detected by HMQC H-1/Se-77 NMR spectroscopy SO CHEMICAL COMMUNICATIONS LA English DT Article ID MAGNETIC-RESONANCE SPECTROSCOPY; SE-77; ACID AB One-pot coupling of a chiral selone derivatizing agent to a series of chiral and racemic amines mediated with triphosgene gives adducts in yields ranging from 80-99%; Se-77 NMR spectroscopy evaluation of the diastereoisomeric adduct conveniently allows the determination of the enantiomeric excesses of the parent chiral amines. C1 LOS ALAMOS NATL LAB,BIOSCI & BIOTECHNOL SECT,LOS ALAMOS,NM 87545. UNIV S CAROLINA,DEPT CHEM & BIOCHEM,COLUMBIA,SC 29208. NR 19 TC 18 Z9 18 U1 1 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 1359-7345 J9 CHEM COMMUN JI Chem. Commun. PD MAY 21 PY 1996 IS 10 BP 1125 EP 1126 DI 10.1039/cc9960001125 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA UN969 UT WOS:A1996UN96900018 ER PT J AU Nicholls, T Hajduk, L Janczur, W Rybicki, K Claxton, B Dowdell, J Deckers, H Deckers, T Dirkmann, M Hutte, M Hutter, M Kolanoski, H Poschl, R Schuhmacher, A Wacker, K Walther, A Wegener, D Wenk, T Cozzika, G Laforge, B Laporte, JF Perez, E Royon, C Villet, G Appuhn, RD Arndt, C Barschke, R Buchholz, R Georlach, U Korbel, V Lehner, F Meyer, A Muller, G Steiner, H Weber, M Ferencei, J Janoth, J Meier, K Schleif, S Stiewe, J Zuber, K Dau, WD Bruncko, D Krivan, F Maracek, R Murin, P Spalek, J Eisenhandler, E Landon, M Jonsson, L Chechelnitski, S Efremenko, V Fominykh, B Gorelov, I Nagovizin, V Ozerov, D Rostovtsev, A Shekelyan, V Semenov, A Solochenko, V Tchernyshov, V Zhokin, A Eliseev, AN Gorbov, LA Smirnov, PA Lamarche, F Migliori, A Moreau, F Sirois, Y Spielmann, S VanDenPlas, D Barrelet, E Bassler, U DagoretCampagne, S Deschamps, F Lacour, D Cvach, J Herynek, I Hladky, J Valkar, S Zacek, J AF Nicholls, T Hajduk, L Janczur, W Rybicki, K Claxton, B Dowdell, J Deckers, H Deckers, T Dirkmann, M Hutte, M Hutter, M Kolanoski, H Poschl, R Schuhmacher, A Wacker, K Walther, A Wegener, D Wenk, T Cozzika, G Laforge, B Laporte, JF Perez, E Royon, C Villet, G Appuhn, RD Arndt, C Barschke, R Buchholz, R Georlach, U Korbel, V Lehner, F Meyer, A Muller, G Steiner, H Weber, M Ferencei, J Janoth, J Meier, K Schleif, S Stiewe, J Zuber, K Dau, WD Bruncko, D Krivan, F Maracek, R Murin, P Spalek, J Eisenhandler, E Landon, M Jonsson, L Chechelnitski, S Efremenko, V Fominykh, B Gorelov, I Nagovizin, V Ozerov, D Rostovtsev, A Shekelyan, V Semenov, A Solochenko, V Tchernyshov, V Zhokin, A Eliseev, AN Gorbov, LA Smirnov, PA Lamarche, F Migliori, A Moreau, F Sirois, Y Spielmann, S VanDenPlas, D Barrelet, E Bassler, U DagoretCampagne, S Deschamps, F Lacour, D Cvach, J Herynek, I Hladky, J Valkar, S Zacek, J TI Performance of an electromagnetic lead/scintillating-fibre calorimeter for the H1 detector SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The properties of final modules of a high resolution lead/scintillating-fibre calorimeter to upgrade the backward region of the H1 detector were studied with electrons in the energy range from 2-60 GeV. The electromagnetic calorimeter consists of scintillating fibres with a diameter of 0.5 mm embedded in a lead matrix. This small fibre radius, in combination with a lead-to-fibre ratio of 2.27:1, ensures excellent energy resolution which has been measured to be sigma/E=7.1%/root E/GeV+1.0%. The spatial resolution as a function of energy for impact points at the center of a cell is given by 4.4 mm/root E/GeV+1.0 mm. The time resolution was found to be better than 0.4 ns. C1 DESY,FHIK,D-22603 HAMBURG,GERMANY. UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. INST NUCL PHYS,KRAKOW,POLAND. RUTHERFORD APPLETON LAB,DIV ELECT,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV DORTMUND,INST PHYS,W-4600 DORTMUND,GERMANY. CENS,CEA,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. CHRISTIAN ALBRECHTS UNIV KIEL,INST REINE & ANGEW KERNPHYS,W-2300 KIEL,GERMANY. SLOVAK ACAD SCI,INST EXPTL PHYS,KOSICE 04353,SLOVAKIA. UNIV LONDON QUEEN MARY & WESTFIELD COLL,DEPT PHYS,LONDON E1 4NS,ENGLAND. INST THEORET & EXPTL PHYS,MOSCOW 117259,RUSSIA. PN LEBEDEV PHYS INST,MOSCOW 117924,RUSSIA. ECOLE POLYTECH,IN2P3,LPNHE,CNRS,PALAISEAU,FRANCE. UNIV PARIS 06,LPNHE,F-75252 PARIS,FRANCE. UNIV PARIS 07,IN2P3,CNRS,F-75221 PARIS,FRANCE. ACAD SCI CZECH REPUBL,INST PHYS,PRAGUE,CZECH REPUBLIC. CHARLES UNIV,NUCL CTR,PRAGUE,CZECH REPUBLIC. LUND UNIV,DEPT PHYS,S-22100 LUND,SWEDEN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Eliseev, Alexandr/N-2090-2015; Gorelov, Igor/J-9010-2015; Ozerov, Dmitry/E-9139-2016; Cvach, Jaroslav/G-6269-2014 OI Gorelov, Igor/0000-0001-5570-0133; NR 17 TC 59 Z9 60 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 MAY 21 PY 1996 VL 374 IS 2 BP 149 EP 156 DI 10.1016/0168-9002(95)01443-8 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA UR255 UT WOS:A1996UR25500003 ER PT J AU Boese, R Braunlich, G Gotteland, JP Hwang, JT Troll, C Vollhardt, KPC AF Boese, R Braunlich, G Gotteland, JP Hwang, JT Troll, C Vollhardt, KPC TI Metalated tetra- and penta(cyclopentadienyl)-cyclopentadienyl compounds: Syntheses by multiple Pd-catalyzed cyclopentadienylations SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID COUPLING REACTIONS; PALLADIUM; COMPLEXES C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV ESSEN GESAMTHSCH,INST ANORGAN CHEM,D-45117 ESSEN,GERMANY. RI Troll, Carsten/B-5072-2017 OI Troll, Carsten/0000-0002-7552-3135 NR 57 TC 18 Z9 18 U1 0 U2 4 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD MAY 20 PY 1996 VL 35 IS 9 BP 995 EP 998 DI 10.1002/anie.199609951 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA UP335 UT WOS:A1996UP33500013 ER PT J AU Dong, ZC Corbett, JD AF Dong, ZC Corbett, JD TI Na(14)K(6)Tl(18)M (M=Mg, Zn, Cd, Hg) and Na13.5Sm0.5K6Tl18Na: Novel octahedral and centered icosahedral cluster phases related to the Mg2Zn11-type structure SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 22 TC 37 Z9 37 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD MAY 20 PY 1996 VL 35 IS 9 BP 1006 EP 1009 DI 10.1002/anie.199610061 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA UP335 UT WOS:A1996UP33500018 ER PT J AU Warren, WL Vanheusden, K Schwank, JR Fleetwood, DM Winokur, PS Devine, RAB AF Warren, WL Vanheusden, K Schwank, JR Fleetwood, DM Winokur, PS Devine, RAB TI Mechanism for anneal-induced interfacial charging in SiO2 thin films on Si SO APPLIED PHYSICS LETTERS LA English DT Article ID SI-SIO2 INTERFACE; BURIED SIO2; HYDROGEN; STATES; SILICON; DEFECT; CENTERS; TRAP AB H-induced positive charging is observed at both the top Si/SiO2 and bottom SiO2/Si interfaces in Si/SiO2/Si structures. The response of the H Induced positive charge to thermal annealing and electron injection is very different from that of simple oxygen vacancy hole traps in SiO2. To explain this H-induced positive charging, we propose a scheme in which H reacts to form positively charged over-coordinated oxygen centers in close proximity to both top and bottom interfaces. The annealing-induced entity may also provide a natural explanation for the origin of the fixed oxide charge that forms during oxidation of Si. (C) 1996 American Institute of Physics. C1 SANDIA NATL LABS,F-38243 MEYLAN,FRANCE. FRANCE TELECOM,CTR NATL ETUD TELECOMMUN,F-38243 MEYLAN,FRANCE. RP Warren, WL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 25 TC 38 Z9 38 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 20 PY 1996 VL 68 IS 21 BP 2993 EP 2995 DI 10.1063/1.116674 PG 3 WC Physics, Applied SC Physics GA UL632 UT WOS:A1996UL63200026 ER PT J AU Han, S Wagner, RS AF Han, S Wagner, RS TI Grain boundary effects on carrier transport in undoped polycrystalline chemical-vapor-deposited diamond SO APPLIED PHYSICS LETTERS LA English DT Article AB A quantitative measure of grain-boundary effects on the carrier transport properties in polycrystalline chemical-vapor-deposited diamond has been obtained using a 10-ns hard x-ray excitation source. Two device geometries were used to gain insight into the extent of grain-boundary effects: one having the applied electric field normal and the other parallel to the grain orientation. The applied electric field intensity was varied to adjust the mean-free carrier drift distance. The degradation in the carrier transport properties at an electric field intensity of 10 kV/cm by the grain-boundary appears to be approximately a factor of two in comparison to the intragrain carrier transport. RP Han, S (reprint author), LOS ALAMOS NATL LAB,D429,LOS ALAMOS,NM 87545, USA. NR 10 TC 29 Z9 29 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 20 PY 1996 VL 68 IS 21 BP 3016 EP 3018 DI 10.1063/1.116682 PG 3 WC Physics, Applied SC Physics GA UL632 UT WOS:A1996UL63200034 ER PT J AU Buchholz, DB Lei, JS Mahajan, S Markworth, PR Chang, RPH Hinds, B Marks, TJ Schindler, JL Kannewurf, CR Huang, Y Merkle, KL AF Buchholz, DB Lei, JS Mahajan, S Markworth, PR Chang, RPH Hinds, B Marks, TJ Schindler, JL Kannewurf, CR Huang, Y Merkle, KL TI In-plane orientation control of (001)YBa2Cu3O7-delta grown on (001)MgO by pulsed organometallic beam epitaxy SO APPLIED PHYSICS LETTERS LA English DT Article ID GRAIN-BOUNDARY JUNCTIONS; YBA2CU3O7 THIN-FILMS; MGO; SURFACES; BA AB Thin films of (001) YBCO are grown on epitaxially polished (001) MgO by pulsed organometallic beam epitaxy. The in-plane orientation of the film is controlled by the thickness of a BaO layer, grown in situ, prior to the YBCO growth-Eor thin BaO layers(< approximate to 7 x 10(14) Ba/cm(2)) the films grown [11O]YBCO\\[100]MgO. For thick BaO layers (> approximate to 11 x 10(14) Ba/cm(2)) the films grow [100]YBCO\\[100]MgO. A mechanism that relates the change in YBCO in-plane orientation to a change in the structure of the initial BaO layers with BaO thickness is described. (C) 1996 American Institute of Physics. C1 NORTHWESTERN UNIV, DEPT CHEM, EVANSTON, IL 60208 USA. NORTHWESTERN UNIV, DEPT ELECT ENGN, EVANSTON, IL 60208 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. RI Chang, R.P.H/B-7505-2009 NR 15 TC 10 Z9 10 U1 0 U2 0 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 MAY 20 PY 1996 VL 68 IS 21 BP 3037 EP 3039 DI 10.1063/1.115569 PG 3 WC Physics, Applied SC Physics GA UL632 UT WOS:A1996UL63200041 ER PT J AU Shaw, TM Laibowitz, RB Beach, D Duncombe, PR AF Shaw, TM Laibowitz, RB Beach, D Duncombe, PR TI The capacitance of Pt/Pb0.65La0.28Ti0.96O3/Pt structures SO APPLIED PHYSICS LETTERS LA English DT Article ID TITANATE THIN-FILMS; ELECTRICAL-PROPERTIES AB The capacitance/voltage characteristics of thin paraelectric lead lanthanum titanate films are measured using platinum electrodes. The films have a maximum capacitance when either a small positive or negative bias voltage is applied. This characteristic is consistent with the electrode interfaces acting as Schottky-like barriers. The voltage at which the capacitance maxima occur increases linearly with film thickness indicating that the film is highly resistive. On the basis of the high apparent film resistance it is proposed that the voltage dependence of the capacitance of the electrode interfaces arises from the ionization of deep level traps within the film and not from depletion layers associated with shallow donor or acceptor states. Application of voltages larger than about 2-3 V results in the disappearance of the capacitance maxima indicating that irreversible changes in the electrode interfaces occur at higher electric fields. (C) 1995 American Institute of Physics. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RP Shaw, TM (reprint author), IBM CORP,DIV RES,TJ WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 20 PY 1996 VL 68 IS 21 BP 3043 EP 3045 DI 10.1063/1.115571 PG 3 WC Physics, Applied SC Physics GA UL632 UT WOS:A1996UL63200043 ER PT J AU Kelson, DD Illingworth, GD Freedman, WF Graham, JA Hill, R Madore, BF Saha, A Stetson, PB Kennicutt, RC Mould, JR Hughes, SM Ferrarese, L Phelps, R Turner, A Cook, KH Ford, H Hoessel, JG Huchra, J AF Kelson, DD Illingworth, GD Freedman, WF Graham, JA Hill, R Madore, BF Saha, A Stetson, PB Kennicutt, RC Mould, JR Hughes, SM Ferrarese, L Phelps, R Turner, A Cook, KH Ford, H Hoessel, JG Huchra, J TI The Extragalactic Distance Scale Key Project .3. The discovery of cepheids and a new distance to M101 using the Hubble Space Telescope SO ASTROPHYSICAL JOURNAL LA English DT Article DE Cepheids; distance scale; galaxies, distances and redshifts; galaxies, individual (M101) ID FIELD PLANETARY CAMERA; BVRI CCD PHOTOMETRY; NEARBY GALAXIES; MAGELLANIC CLOUDS; CONSTANT; STARS; NGC-2403; STEPS AB We report on the discovery of 29 Cepheid variables in the galaxy M101 using the original Wide Field Camera (WFC) and the new Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope. We observed a field in M101 at 17 independent epochs in V (F555W), five epochs in I (F785LP/F814W), and one epoch in B (F439W), with a time interval baseline of 381 days. We have found Cepheids with periods ranging from 10 to 60 days. The data have been calibrated using WFPC2 observations with zero points derived from omega Cen, Pal 4, and NGC 2419 observations. This calibration has been verified by using the Medium Deep Survey (MDS) WFC photometric zero points, and groundbased secondary standards in V and I. The V calibrations agree to +/-0.06 mag, and the I calibrations agree to +/-0.04 mag. We have constructed V and I period-luminosity (PL) relations and have derived apparent distance moduli based on a distance modulus for the Large Magellanic Cloud (LMC) of 18.50 mag and a reddening of E(B-V) = 0.10 mag to the LMC Cepheids. Period-residual minimization was used to minimize the effects of Malmquist bias on the period-luminosity relation fitting process. Using a Galactic extinction law and the apparent V and I distance moduli, we have found a mean reddening for the M101 sample of E(B-V) = 0.03 mag and a true distance modulus to M101 of 29.34 +/- 0.17 mag, corresponding to a distance of 7.4 +/- 0.6 Mpc. The sources of error have been rigorously tracked through an error budget; systematic and random errors contribute roughly equally to the quoted error. The mean gas-phase metal abundances in the LMC and in the M101 outer field are similar so we expect metallicity effects to be minimal. These Cepheids will be used in conjunction with results from a Key Project search for Cepheids in an inner field, where the metallicity is larger by a factor of 5, to probe the effects of abundance on the Cepheid period-luminosity relation. C1 CARNEGIE INST WASHINGTON OBSERV,PASADENA,CA 91101. CARNEGIE INST WASHINGTON,DEPT TERR MAGNETISM,WASHINGTON,DC 20015. CALTECH,JET PROP LAB,NASA,INFRARED PROC & ANAL CTR,IPAC EXTRAGALACT DATABAS,PASADENA,CA 91125. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. DOMINION ASTROPHYS OBSERV,NATL RES COUNCIL,VICTORIA,BC V8X 4M6,CANADA. UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WESTON,ACT 2611,AUSTRALIA. JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. ROYAL GREENWICH OBSERV,CAMBRIDGE CB3 0EZ,ENGLAND. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP Kelson, DD (reprint author), UNIV CALIF SANTA CRUZ,LICK OBSERV,UCO,SANTA CRUZ,CA 95064, USA. OI SAHA, ABHIJIT/0000-0002-6839-4881 NR 66 TC 104 Z9 104 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 20 PY 1996 VL 463 IS 1 BP 26 EP & DI 10.1086/177221 PN 1 PG 41 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA UL339 UT WOS:A1996UL33900004 ER PT J AU Staub, U Soderholm, L Skanthakumar, S Rosenkranz, S Ritter, C Kagunya, W AF Staub, U Soderholm, L Skanthakumar, S Rosenkranz, S Ritter, C Kagunya, W TI Tb spin correlations in Pb2Sr3Tb0.5Ca0.5Cu3O8 SO EUROPHYSICS LETTERS LA English DT Article AB High-resolution neutron spectroscopy and neutron diffraction results on the magnetic properties of Tb in the high-T-c superconductor Pb2Sr2Tb0.5Ca0.5Cu3O8 are presented. The lowest-lying crystalline-electric-field transition, expected at 7 mu eV, is not observed, indicating that the system can still be described in the mean-field approximation at 20 K, well above T-N (4 K). The inelastic neutron spectra can be decomposed into an elastic and a quasi-elastic part, indicating that a single Lorentzian does not describe well the magnetic-response function and/or that Tb 2D short-range correlations persist up to temperatures above 100 K. C1 PAUL SCHERRER INST,SWISS LIGHT SOURCE PROJECT,CH-5232 VILLIGEN,SWITZERLAND. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. RP Staub, U (reprint author), ETH & PSI,NEUTRON SCATTERING LAB,CH-5232 VILLIGEN,SWITZERLAND. RI Rosenkranz, Stephan/E-4672-2011; Staub, Urs/C-4914-2015 OI Rosenkranz, Stephan/0000-0002-5659-0383; NR 12 TC 10 Z9 10 U1 0 U2 1 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAY 20 PY 1996 VL 34 IS 6 BP 447 EP 452 DI 10.1209/epl/i1996-00477-3 PG 6 WC Physics, Multidisciplinary SC Physics GA UP423 UT WOS:A1996UP42300009 ER PT J AU Paolasini, L Lander, GH Shapiro, SM Caciuffo, R Lebech, B Regnault, LP Roessli, B Fournier, JM AF Paolasini, L Lander, GH Shapiro, SM Caciuffo, R Lebech, B Regnault, LP Roessli, B Fournier, JM TI Enhanced exchange in the itinerant ferromagnet UFe2 SO EUROPHYSICS LETTERS LA English DT Article ID MAGNETIC-PROPERTIES; INTERMETALLICS AB Neutron inelastic-scattering experiments on the itinerant ferromagnet UFe2 have shown that the strong hybridization between the U 5 (f) under bar and Fe 3 (d) under bar electrons results in a number of major changes compared to the physics of the isostructural RFe(2) (R = Tb, Ho, and Er) compounds. We have observed that the Fe-Fe exchange interaction in this compound is actually greater at low temperature than it is in pure iron. This situation is not found in the RFe(2) compounds. Excitations involving the U moments are heavily damped. We conclude with remarks on the possibility of synthesizing compounds with high Curie temperatures containing uranium. C1 CEA GRENOBLE,DEPT RECH FONDAMENTALE MAT CONDENSEE,SPSM MDN,F-38054 GRENOBLE 9,FRANCE. BROOKHAVEN NATL LAB LONG ISL,DEPT PHYS,UPTON,NY 11973. UNIV ANCONA,DIPARTIMENTO SCI MAT & TERRA,I-60131 ANCONA,ITALY. IST NAZL FIS MAT,I-60131 ANCONA,ITALY. RISO NATL LAB,DEPT PHYS,DK-4000 ROSKILDE,DENMARK. UNIV GRENOBLE 1,F-38000 GRENOBLE,FRANCE. RP Paolasini, L (reprint author), COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST TRANSURANIUM ELEMENTS,POSTFACH 2340,D-76125 KARLSRUHE,GERMANY. RI Lebech, Bente/A-9629-2016; OI Lebech, Bente/0000-0002-6403-4141; Caciuffo, Roberto G. M./0000-0002-8708-6219 NR 17 TC 4 Z9 4 U1 1 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAY 20 PY 1996 VL 34 IS 6 BP 459 EP 464 DI 10.1209/epl/i1996-00479-1 PG 6 WC Physics, Multidisciplinary SC Physics GA UP423 UT WOS:A1996UP42300011 ER PT J AU Beretvas, A AF Beretvas, A TI Kinematics of the t(t)over-bar events in W+ jets at CDF SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Review ID HADRON AB We compare the CDF W + n greater than or equal to 3 jets data with predictions using the standard model. Herwig is used to simulate production and VECBOS is used to simulate QCD W+n greater than or equal to 3 jets. We look at four different data sets with tt content varying from 20% to 75%, and examine several kinematic variables. We conclude that the data are consistent with the standard model. RP Beretvas, A (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD MAY 20 PY 1996 VL 11 IS 13 BP 2233 EP 2252 DI 10.1142/S0217751X96001115 PG 20 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA UK986 UT WOS:A1996UK98600001 ER PT J AU Verbist, G Weaire, D Kraynik, AM AF Verbist, G Weaire, D Kraynik, AM TI The foam drainage equation SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Review ID EMULSIONS AB The drainage of liquid in a foam may be described in terms of a nonlinear partial differential equation for the foam density as a function of time and vertical position. We review the history and recent development of this theory, analysing various exact and approximate solutions and relating them to each other. C1 TRINITY COLL DUBLIN, DEPT PHYS, DUBLIN, IRELAND. SANDIA NATL LABS, ENGN SCI CTR, ALBUQUERQUE, NM 87185 USA. RP SHELL INT OIL PROD BV, SHELL RES & TECHNOL CTR, POB 38000, 1030 BN AMSTERDAM, NETHERLANDS. NR 18 TC 178 Z9 180 U1 3 U2 23 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 EI 1361-648X J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAY 20 PY 1996 VL 8 IS 21 BP 3715 EP 3731 DI 10.1088/0953-8984/8/21/002 PG 17 WC Physics, Condensed Matter SC Physics GA UM843 UT WOS:A1996UM84300002 ER PT J AU Frixione, S Kunszt, Z Signer, A AF Frixione, S Kunszt, Z Signer, A TI Three-jet cross sections to next-to-leading order SO NUCLEAR PHYSICS B LA English DT Article ID QCD RADIATIVE-CORRECTIONS; PARTON-PARTON SCATTERING; HADRON-COLLISIONS; CLUSTERING-ALGORITHM; PBARP COLLISIONS; GLUON SCATTERING; E+E ANNIHILATION; GAUGE-THEORIES; 3-JET EVENTS; O(ALPHA-S3) AB One- and two-jet inclusive quantities in hadron collisions have already been calculated to next-to-leading order accuracy, using both the subtraction and the slicing method. Since the one-loop corrections have recently been obtained for all five-parton amplitudes, three-jet inclusive quantities can also be predicted to next-to-leading order. The subtraction method presented in the literature is based on a systematic use of boost-invariant kinematical variables, and therefore its application to three-jet production is quite cumbersome. In this paper we re-analyze the subtraction method and point out the advantage of using angle and energy variables. This leads to simpler results and has complete generality, extending its validity to n-jet production. The formalism is also applicable to n-jet production in e(+)e(-) annihilation and in photon-hadron collisions. All the analytical results necessary to construct an efficient numerical program for next-to-leading order three-jet inclusive quantities in hadroproduction are given explicitly. As a new analytical result, we also report the collinear limits of all the two-to-four processes. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP Frixione, S (reprint author), ETH ZURICH,ZURICH,SWITZERLAND. RI Kunszt, Zoltan/G-3420-2013 NR 64 TC 400 Z9 400 U1 0 U2 1 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 MAY 20 PY 1996 VL 467 IS 3 BP 399 EP 442 DI 10.1016/0550-3213(96)00110-1 PG 44 WC Physics, Particles & Fields SC Physics GA UR256 UT WOS:A1996UR25600003 ER PT J AU Benzing, WM Shook, GM AF Benzing, WM Shook, GM TI Study advances view of geopressure seals SO OIL & GAS JOURNAL LA English DT Article ID GENERATION RP Benzing, WM (reprint author), IDAHO NATL ENGN LAB,INTEGRATED EARTH SCI GRP,IDAHO FALLS,ID 83415, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0030-1388 J9 OIL GAS J JI Oil Gas J. PD MAY 20 PY 1996 VL 94 IS 21 BP 62 EP & PG 4 WC Energy & Fuels; Engineering, Petroleum SC Energy & Fuels; Engineering GA UL725 UT WOS:A1996UL72500021 ER PT J AU Canfield, PC Budko, SL Cho, BK AF Canfield, PC Budko, SL Cho, BK TI Possible co-existence of superconductivity and weak ferromagnetism in ErNi2B2C SO PHYSICA C LA English DT Article AB Detailed measurements of the field H and temperature T dependent, anisotropic magnetization M(T, H) on single crystal ErNi2B2C indicate that there is a phase transition to a magnetically ordered ground state that has a weak ferromagnetic component of 0.33 mu(B)/Er for T < 2.3 K. This ordering is similar to the transition to weak ferromagnetism seen in TbNi2B2C, but, unlike TbNi2B2C, the ferromagnetic component exists in ErNi2B2C for temperatures and fields that are well below the T-c and H-c2. Therefore, in ErNi2B2C there appears to be the coexistence of superconductivity and weak ferromagnetism for T < 2.3 K and H < 12 kG. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP Canfield, PC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Canfield, Paul/H-2698-2014 NR 18 TC 118 Z9 119 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 20 PY 1996 VL 262 IS 3-4 BP 249 EP 254 DI 10.1016/0921-4534(96)00221-3 PG 6 WC Physics, Applied SC Physics GA UV450 UT WOS:A1996UV45000016 ER PT J AU Duncan, A Eichten, E Thacker, H AF Duncan, A Eichten, E Thacker, H TI Electromagnetic splittings and light quark masses in lattice QCD SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHIRAL PERTURBATION-THEORY AB A method for computing electromagnetic properties of hadrons in lattice QCD is described and preliminary numerical results are presented. The electromagnetic field is introduced dynamically, using a noncompact formulation. Employing enhanced electric charges, the dependence of the pseudoscalar meson mass on the (anti)quark charges and masses can be accurately calculated. At beta = 5.7 with Wilson action, the pi(+)-pi(0) splitting is found to be 4.9(3) MeV. Using the measured K-0-K+ splitting, we also find m(u)/m(d) = 0.512(6). Systematic errors are discussed. C1 FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. UNIV VIRGINIA, DEPT PHYS, CHARLOTTESVILLE, VA 22901 USA. RP UNIV PITTSBURGH, DEPT PHYS & ASTRON, PITTSBURGH, PA 15260 USA. NR 19 TC 69 Z9 69 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1996 VL 76 IS 21 BP 3894 EP 3897 DI 10.1103/PhysRevLett.76.3894 PG 4 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700004 ER PT J AU Duboscq, JE Fulton, R Fujino, D Gan, KK Honscheid, K Kagan, H Kass, R Lee, J Sung, M White, C Wanke, R Wolf, A Zoeller, MM Fu, X Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Miao, T Miller, DH Modesitt, M Shibata, EI Shipsey, IPJ Wang, PN Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Wang, R Coan, TE Dominick, J Fadeyev, V Korolkov, I Lambrecht, M Sanghera, S Shelkov, V Stroynowski, R Volobouev, I Wei, G Artuso, M Efimov, A Gao, M Goldberg, M He, D Horwitz, N Kopp, S Moneti, GC Mountain, R Mukhin, Y Playfer, S Skwarnicki, T Stone, S Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Gibaut, D Kinoshita, K Pomianowski, P Schrenk, S Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Athanas, M Bliss, DW Brewer, WS Masek, G Paar, HP Gronberg, J Korte, CM Kutschke, R Menary, S Morrison, RJ Nakanishi, S Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Tajima, H Witherell, MS Balest, R Cho, K Ford, WT Lohner, M Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Dumas, DJ Ehrlich, R Elia, R Gaidarev, P Gittelman, B Gray, SW Hartill, DL Heltsley, BK Jones, CD Jones, SL Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Norberg, E Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Avery, P Freyberger, A Prescott, C Yang, S Yelton, J Brandenburg, G Briere, RA Cinabro, D Liu, T Saulnier, M Wilson, R Yamamoto, H Browder, TE Li, F Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Palmer, M Selen, M Thaler, JJ Edwards, KW McLean, KW Ogg, H Bellerive, A Britton, DI Janicek, R MacFarlane, DB Patel, PM Spaan, B Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Copty, N Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Kubota, Y Lattery, M Nelson, JK Patton, S Poling, R Riehle, T Savinov, V Alam, MS Kim, IJ Ling, Z Mahmood, AH ONeill, JJ Severini, H Sun, CR Timm, S Wappler, F AF Duboscq, JE Fulton, R Fujino, D Gan, KK Honscheid, K Kagan, H Kass, R Lee, J Sung, M White, C Wanke, R Wolf, A Zoeller, MM Fu, X Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Miao, T Miller, DH Modesitt, M Shibata, EI Shipsey, IPJ Wang, PN Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Wang, R Coan, TE Dominick, J Fadeyev, V Korolkov, I Lambrecht, M Sanghera, S Shelkov, V Stroynowski, R Volobouev, I Wei, G Artuso, M Efimov, A Gao, M Goldberg, M He, D Horwitz, N Kopp, S Moneti, GC Mountain, R Mukhin, Y Playfer, S Skwarnicki, T Stone, S Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Gibaut, D Kinoshita, K Pomianowski, P Schrenk, S Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Athanas, M Bliss, DW Brewer, WS Masek, G Paar, HP Gronberg, J Korte, CM Kutschke, R Menary, S Morrison, RJ Nakanishi, S Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Tajima, H Witherell, MS Balest, R Cho, K Ford, WT Lohner, M Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Dumas, DJ Ehrlich, R Elia, R Gaidarev, P Gittelman, B Gray, SW Hartill, DL Heltsley, BK Jones, CD Jones, SL Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Norberg, E Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Avery, P Freyberger, A Prescott, C Yang, S Yelton, J Brandenburg, G Briere, RA Cinabro, D Liu, T Saulnier, M Wilson, R Yamamoto, H Browder, TE Li, F Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Palmer, M Selen, M Thaler, JJ Edwards, KW McLean, KW Ogg, H Bellerive, A Britton, DI Janicek, R MacFarlane, DB Patel, PM Spaan, B Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Copty, N Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Kubota, Y Lattery, M Nelson, JK Patton, S Poling, R Riehle, T Savinov, V Alam, MS Kim, IJ Ling, Z Mahmood, AH ONeill, JJ Severini, H Sun, CR Timm, S Wappler, F TI Measurement of the form factors for (B)over-bar(0)->D*(+)l(-)(nu)over-bar SO PHYSICAL REVIEW LETTERS LA English DT Article ID ISGUR-WISE FUNCTION; HEAVY MESONS; DECAYS AB Using a sample of 2.6 x 10(6) Upsilon(4S) --> B (B) over bar events collected with the CLE (O) over right arrow II detector at the Cornell Electron Storage Ring, we have measured the form factors for (B) over bar(0) --> D*(+)l(-)<(nu)over bar>. We perform a three-parameter fit with the joint distribution of four kinematic variables to obtain the form-factor ratios R(1) = 1.18 +/- 0.30 +/- 0.12 and R(2) = 0.71 +/- 0.22 +/- 0.07, and the form-factor slope rho(A1)(2) = 0.91 +/- 0.15 +/- 0.06, which is closely related to the slope of the Isgur-Wise function. The form-factor ratios are consistent with predicted corrections to the heavy-quark symmetry limit R(1) = R(2) = 1. C1 UNIV OKLAHOMA,NORMAN,OK 73019. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. SO METHODIST UNIV,DALLAS,TX 75275. SYRACUSE UNIV,SYRACUSE,NY 13244. VANDERBILT UNIV,NASHVILLE,TN 37235. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. CALTECH,PASADENA,CA 91125. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV COLORADO,BOULDER,CO 80309. CORNELL UNIV,ITHACA,NY 14853. UNIV FLORIDA,GAINESVILLE,FL 32611. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHAMPAIGN,IL 61801. CARLETON UNIV,OTTAWA,ON K1S 5B6,CANADA. MCGILL UNIV,MONTREAL,PQ H3A 2T8,CANADA. INST PARTICLE PHYS,MONTREAL,PQ,CANADA. ITHACA COLL,ITHACA,NY 14850. UNIV KANSAS,LAWRENCE,KS 66045. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. SUNY ALBANY,ALBANY,NY 12222. RP Duboscq, JE (reprint author), OHIO STATE UNIV,COLUMBUS,OH 43210, USA. RI Schaffner, Stephen/D-1189-2011; Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 21 TC 87 Z9 87 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1996 VL 76 IS 21 BP 3898 EP 3902 DI 10.1103/PhysRevLett.76.3898 PG 5 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700005 ER PT J AU Wang, S Lisa, MA Albergo, S Bieser, F Brady, FP Caccia, Z Cebra, DA Chacon, AD Chance, JL Choi, Y Costa, S Elliott, JB Gilkes, ML Hauger, JA Hirsch, AS Hjort, EL Insolia, A Justice, M Keane, D Kintner, J Lindenstruth, V Liu, H Matis, HS McMahan, M McParland, C Olson, DL Partlan, MD Porile, NT Potenza, R Rai, G Rasmussen, J Ritter, HG Romanski, J Romero, JL Russo, GV Scharenberg, RP Scott, A Shao, Y Srivastava, BK Symons, TJM Tincknell, ML Tuve, C Warren, PG Weerasundara, D Wieman, HH Wolf, KL AF Wang, S Lisa, MA Albergo, S Bieser, F Brady, FP Caccia, Z Cebra, DA Chacon, AD Chance, JL Choi, Y Costa, S Elliott, JB Gilkes, ML Hauger, JA Hirsch, AS Hjort, EL Insolia, A Justice, M Keane, D Kintner, J Lindenstruth, V Liu, H Matis, HS McMahan, M McParland, C Olson, DL Partlan, MD Porile, NT Potenza, R Rai, G Rasmussen, J Ritter, HG Romanski, J Romero, JL Russo, GV Scharenberg, RP Scott, A Shao, Y Srivastava, BK Symons, TJM Tincknell, ML Tuve, C Warren, PG Weerasundara, D Wieman, HH Wolf, KL TI In-plane retardation of collective expansion in Au+Au collisions SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; RELATIVISTIC NUCLEAR COLLISIONS; FLOW; MATTER; ENERGY; EQUATION; BLAST; STATE AB Using charged-particle-exclusive measurements of Au + Au collisions in the Bevalac's EOS time projection chamber, we demonstrate the advantages of an alternative representation of the squeeze-out phenomenon where the speed of collective expansion is slowest in the plane of the reaction, and is modulated sinusoidally according to fragment azimuth relative to this plane. This simpler representation facilitates a highly comprehensive description of light fragment spectra and the three main categories of collective motion: sideward flow, squeeze-out, and radial expansion. C1 KENT STATE UNIV,KENT,OH 44242. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV CALIF DAVIS,DAVIS,CA 95616. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV CATANIA,I-95129 CATANIA,ITALY. IST NAZL FIS NUCL,I-95129 CATANIA,ITALY. RP Wang, S (reprint author), LAWRENCE BERKLEY NATL LAB,BERKELEY,CA 94720, USA. RI Insolia, Antonio/M-3447-2015; TUVE', Cristina/P-3933-2015 OI Insolia, Antonio/0000-0002-9040-1566; TUVE', Cristina/0000-0003-0739-3153 NR 34 TC 35 Z9 35 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 MAY 20 PY 1996 VL 76 IS 21 BP 3911 EP 3914 DI 10.1103/PhysRevLett.76.3911 PG 4 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700008 ER PT J AU Diehl, S Cubaynes, D Bizau, JM Journel, L Rouvellou, B Al Moussalami, S Wuilleumier, FJ Kennedy, ET Berrah, N Blancard, C Morgan, TJ Bozek, J Schlachter, AS VoKy, L Faucher, P Hibbert, A AF Diehl, S Cubaynes, D Bizau, JM Journel, L Rouvellou, B Al Moussalami, S Wuilleumier, FJ Kennedy, ET Berrah, N Blancard, C Morgan, TJ Bozek, J Schlachter, AS VoKy, L Faucher, P Hibbert, A TI High resolution measurements of partial photoionization cross sections in hollow lithium: A critical comparison with advanced many-body calculations SO PHYSICAL REVIEW LETTERS LA English DT Article ID LI-I; AUTOIONIZATION; TRANSITIONS; STATES; IONS AB Photoelectron data for hollow lithium states obtained with unprecedented high spectral resolution and sensitivity are presented. A critical comparison is made with the most recent theoretical results. Partial cross sections are measured providing the first definitive test of advanced ab initio calculations for this highly excited four-body atomic system. C1 DUBLIN CITY UNIV, DUBLIN 9, IRELAND. WESTERN MICHIGAN UNIV, KALAMAZOO, MI 49008 USA. CEA, CTR ETUD NUCL LIMEIL VALENTON, F-94195 VILLENEUVE, FRANCE. WESLEYAN UNIV, MIDDLETOWN, CT 06459 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, ADV LIGHT SOURCE, BERKELEY, CA 94720 USA. OBSERV COTE AZUR, F-06304 NICE, FRANCE. QUEENS UNIV BELFAST, BELFAST, ANTRIM, NORTH IRELAND. RP Diehl, S (reprint author), UNIV PARIS 11, LAB PHYS ATOM & ION, B 350, F-91405 ORSAY, FRANCE. RI Bozek, John/E-4689-2010; Bozek, John/E-9260-2010 OI Bozek, John/0000-0001-7486-7238 NR 21 TC 73 Z9 73 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 MAY 20 PY 1996 VL 76 IS 21 BP 3915 EP 3918 DI 10.1103/PhysRevLett.76.3915 PG 4 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700009 ER PT J AU Barnes, MD Kung, CY Whitten, WB Ramsey, JM Arnold, S Holler, S AF Barnes, MD Kung, CY Whitten, WB Ramsey, JM Arnold, S Holler, S TI Fluorescence of oriented molecules in a microcavity SO PHYSICAL REVIEW LETTERS LA English DT Article ID SPONTANEOUS-EMISSION RATES; OPTICAL CAVITY; QUANTUM ELECTRODYNAMICS; DIELECTRIC PARTICLES; ENERGY-TRANSFER AB Fluorescence decay rate modification has been observed for molecules in liquid microspheres (3.5 to 25 mu m in diameter) where the molecular position and transition moment orientation are well defined. For small sizes (<6 mu m), the decay rates scale roughly as r(-1) and agree quantitatively with semiclassical calculations. For larger sizes (>15 mu m) where the cavity storage time and fluorescence lifetime are roughly equal, an anomalous decrease in the decay rate of approximate to 30% is observed which is interpreted as a consequence of intermediate molecule-cavity coupling. C1 POLYTECH INST NEW YORK,MICROPARTICLE PHOTOPHYS LAB,BROOKLYN,NY 11021. RP Barnes, MD (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 20 TC 73 Z9 75 U1 1 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 MAY 20 PY 1996 VL 76 IS 21 BP 3931 EP 3934 DI 10.1103/PhysRevLett.76.3931 PG 4 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700013 ER PT J AU Jia, JJ Callcott, TA Shirley, EL Carlisle, JA Terminello, LJ Asfaw, A Ederer, DL Himpsel, FJ Perera, RCC AF Jia, JJ Callcott, TA Shirley, EL Carlisle, JA Terminello, LJ Asfaw, A Ederer, DL Himpsel, FJ Perera, RCC TI Resonant inelastic x-ray scattering in hexagonal boron nitride observed by soft-x-ray fluorescence spectroscopy SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXCITATION-ENERGY DEPENDENCE; RAMAN-SCATTERING; EMISSION-SPECTRA; BAND-STRUCTURE; RADIATION; ELECTRON; SI AB Photon-excited B K fluorescence spectra were measured for hexagonal boron nitride using tunable synchrotron radiation below and above the B K edge. We report Raman-like resonant inelastic scattering of soft x rays involving excitation of delocalized valence-band electrons. The inelastic scattering features track with the excitation energy below threshold, go through a resonance as the excitation is tuned to the B(1s) core-exciton energy, and evolve into incoherent fluorescence as the excitation is raised further. The energy loss is identified as equivalent to an electronic transition of valence sigma electrons to pi* conduction-band states. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. TULANE UNIV,NEW ORLEANS,LA 70118. UNIV WISCONSIN,MADISON,WI 53706. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP Jia, JJ (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 22 TC 66 Z9 66 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 MAY 20 PY 1996 VL 76 IS 21 BP 4054 EP 4057 DI 10.1103/PhysRevLett.76.4054 PG 4 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700044 ER PT J AU Klots, CE Compton, RN AF Klots, CE Compton, RN TI Direct observation of transition from delayed ionization to direct ionization for free C-60 and C-70: Thermionic emission? Comment SO PHYSICAL REVIEW LETTERS LA English DT Article RP Klots, CE (reprint author), OAK RIDGE NATL LAB,CHEM & BIOL PHYS SECT,OAK RIDGE,TN 37831, USA. NR 15 TC 15 Z9 15 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 MAY 20 PY 1996 VL 76 IS 21 BP 4092 EP 4092 DI 10.1103/PhysRevLett.76.4092 PG 1 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700057 ER PT J AU Baker, GA Kawashima, N AF Baker, GA Kawashima, N TI Renormalized coupling constant for the three-dimensional Ising model - Reply (vol 76, pg 2403, 1996) SO PHYSICAL REVIEW LETTERS LA English DT Correction, Addition C1 UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. RP Baker, GA (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 8 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1996 VL 76 IS 21 BP 4100 EP 4101 DI 10.1103/PhysRevLett.76.4100 PG 2 WC Physics, Multidisciplinary SC Physics GA UL247 UT WOS:A1996UL24700065 ER PT J AU Holzscheiter, MH Feng, X Goldman, T King, NSP Lewis, RA Nieto, MM Smith, GA AF Holzscheiter, MH Feng, X Goldman, T King, NSP Lewis, RA Nieto, MM Smith, GA TI Are antiprotons forever? SO PHYSICS LETTERS A LA English DT Article AB Up to more than one million antiprotons from a single LEAR spill have been captured in a large Penning trap. Surprisingly, when the antiprotons are cooled to energies significantly below 1 eV, the annihilation rate falls below the background. Thus, very long storage times for antiprotons have been demonstrated in the trap, even at the compromised vacuum conditions imposed by the experimental setup. The significance for future ultra-low-energy experiments is discussed. C1 AARHUS UNIV,INST PHYS & ASTRON,DK-8000 AARHUS C,DENMARK. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. PENN STATE UNIV,UNIVERSITY PK,PA 16802. UNIV ULM,ABT QUANTENPHYS,D-89069 ULM,GERMANY. RP Holzscheiter, MH (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 25 TC 54 Z9 54 U1 0 U2 2 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 MAY 20 PY 1996 VL 214 IS 5-6 BP 279 EP 284 DI 10.1016/0375-9601(96)00189-2 PG 6 WC Physics, Multidisciplinary SC Physics GA UP403 UT WOS:A1996UP40300012 ER PT J AU Tang, J Lin, SH AF Tang, J Lin, SH TI Oscillations and non-exponential decays in electron-transfer reactions SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; ENERGY-GAP LAW; FRICTION; DYNAMICS; SPECTROSCOPY; MOLECULES; COHERENCE; PROTEIN; MOTION AB Mechanisms for oscillations and non-exponential population decays in electron-transfer reactions are discussed. A non-Markovian equation with time-retarded rate kernels is derived using the spin-boson model. Three kinds of spectral distributions for the heat bath are considered: the Debye model with an optical phonon mode centered at zero frequency, the low frequency classical modes, and the high frequency quantum modes. Results of numerical simulation are illustrated to demonstrate the usual exponential decays as well as the non-exponential decays and the rare behavior with damped sinusoidal oscillations in electron-transfer reactions. C1 ACAD SINICA, INST ATOM & MOLEC SCI, TAIPEI, TAIWAN. RP Tang, J (reprint author), ARGONNE NATL LAB, DIV CHEM, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Tang, Jau/D-8382-2012 OI Tang, Jau/0000-0003-2078-1513 NR 29 TC 17 Z9 17 U1 0 U2 3 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 MAY 17 PY 1996 VL 254 IS 1-2 BP 6 EP 12 DI 10.1016/0009-2614(96)00282-5 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UM799 UT WOS:A1996UM79900002 ER PT J AU Shirazi, SG Guiochon, G AF Shirazi, SG Guiochon, G TI On non-linear waves in chromatography SO JOURNAL OF CHROMATOGRAPHY A LA English DT Editorial Material DE nonlinear waves; hodograph transform; coherence theory; distance-time diagram; composition paths; characteristics; preparative chromatography ID MULTICOMPONENT; OPTIMIZATION; ADSORPTION C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. AAI,WILMINGTON,NC 28405. OAK RIDGE NATL LAB,DEPT CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 24 TC 1 Z9 1 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAY 17 PY 1996 VL 734 IS 1 BP 3 EP 5 DI 10.1016/0021-9673(96)00092-1 PG 3 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500002 ER PT J AU Guan, H Broyles, BS Guiochon, G AF Guan, H Broyles, BS Guiochon, G TI Modeling of the influence of the experimental conditions on the separation of the components of a binary mixture in isocratic overloaded elution preparative chromatography SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT Symposium on Preparative Chromatography (PREP 95) CY JUN 11-14, 1995 CL GEORGETOWN UNIV CONF CTR, WASHINGTON, DC SP Washington Chromatogr Discuss Grp HO GEORGETOWN UNIV CONF CTR DE preparative chromatography; optimization; elution profiles; computer simulation; thermodynamic parameters AB The elution band profiles of the components of a binary mixture were calculated for systematic variations of the experimental conditions. Three values of the separation factor were used, 1.8, 1.3 and 1.1. The column efficiency was 3000 theoretical plates, except for alpha = 1.1, in which case efficiencies of both 3000 and 5000 plates were used, The relative compositions of 3:1, 1:1, and 1:3 were selected. The values of the loading factor were chosen to illustrate the increasing degrees of interference and band interaction which take place with increasing column loading. In each case, the cutting volumes for the production of each component at a 98% purity were calculated and tabulated. The influence of the experimental conditions on the recovery yield is discussed. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 16 TC 3 Z9 3 U1 0 U2 0 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 MAY 17 PY 1996 VL 734 IS 1 BP 49 EP 62 DI 10.1016/0021-9673(95)01003-3 PG 14 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500004 ER PT J AU Zhong, GM Fornstedt, T Guiochon, G AF Zhong, GM Fornstedt, T Guiochon, G TI Profiles of large-size system peaks and vacancy bands in liquid chromatography .1. Analytical solution of the ideal model SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT Symposium on Preparative Chromatography (PREP 95) CY JUN 11-14, 1995 CL GEORGETOWN UNIV CONF CTR, WASHINGTON, DC SP Washington Chromatogr Discuss Grp HO GEORGETOWN UNIV CONF CTR DE system peaks; vacancy bands; preparative chromatography; band profiles ID PAIR ADSORPTION CHROMATOGRAPHY; ELUTION PROFILES; BINARY ELUENT; MOBILE-PHASE; RESPONSE MODELS; COMPRESSION; RETENTION; IONS AB Often in chromatography, a compound which participates in the retention mechanism is added to the mobile phase, This permits control of the retention factors of the analytes and allows their indirect detection. Injection of large volumes of solutions having a composition different from that of the mobile phase causes perturbation of the equilibrium between the two phases of the chromatographic system, and may result in large positive or negative system peaks when the additive signal is monitored, If the equilibrium behavior is accounted for by competitive Langmuir isotherms, the positive bands, which contain an excess of the additive, are Langmuirian-shaped as in the classical elution case, while the large vacancy bands have an anti-Langmuirian profile. An explicit analytical solution is derived within the framework of the ideal model for the profiles of large-size pulses and vacancies. This solution permits the easy calculation of the retention times of the different parts of the bands, i.e., of its shocks and diffuse boundaries. This solution provides also a more profound explanation of the formation of the large system peaks than available so far and of their distinctive properties as compared to those of large-size bands in classical elution. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 37 TC 12 Z9 13 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAY 17 PY 1996 VL 734 IS 1 BP 63 EP 74 DI 10.1016/0021-9673(95)00983-3 PG 12 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500005 ER PT J AU Sajonz, P Yun, T Hong, GM Fornstedt, T Guiochon, G AF Sajonz, P Yun, T Hong, GM Fornstedt, T Guiochon, G TI Profiles of large-size system peaks and vacancy bands in liquid chromatography .2. Comparison of experimental and calculated profiles SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT Symposium on Preparative Chromatography (PREP 95) CY JUN 11-14, 1995 CL GEORGETOWN UNIV CONF CTR, WASHINGTON, DC SP Washington Chromatogr Discuss Grp HO GEORGETOWN UNIV CONF CTR DE system peaks; vacancy bands; preparative chromatography; band profiles AB The profiles of large-size system peaks and vacancies have been studied and compared. A reversed-phase system was used with an analytical-size column packed with ZORBAX C-18 spherical particles and methanol-water as the mobile phase. The analyte was 3-phenyl-1-propanol. The equilibrium-dispersive model of chromatography was used to calculate band profiles using the measured isotherm data and the column efficiency. The isotherm data were determined using frontal analysis and could be fitted to a simple Langmuir equation. Excellent agreement was found between experimental and calculated results. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 9 TC 15 Z9 15 U1 0 U2 2 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 MAY 17 PY 1996 VL 734 IS 1 BP 75 EP 81 DI 10.1016/0021-9673(95)00982-5 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500006 ER PT J AU Quinones, I Guiochon, G AF Quinones, I Guiochon, G TI Application of different isotherm models to the description of single-component and competitive adsorption SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT Symposium on Preparative Chromatography (PREP 95) CY JUN 11-14, 1995 CL GEORGETOWN UNIV CONF CTR, WASHINGTON, DC SP Washington Chromatogr Discuss Grp HO GEORGETOWN UNIV CONF CTR DE mobile-phase composition; preparative chromatography; adsorption isotherm; retention model; 2-phenylethanol; 3-phenylpropanol ID LIQUID-CHROMATOGRAPHIC SORBENTS; FRONTAL CHROMATOGRAPHY; BAND PROFILES; ENANTIOMERS; BINARY; SILICA; PREDICTION; SEPARATION; CELLULOSE; BEHAVIOR AB Previously reported competitive adsorption data of 2-phenylethanol and 3-phenylpropanol on ODS-silica with methanol-water mobile phase were fitted to the Langmuir isotherm, the generalized version of the Langmuir model suggested by statistical mechanics, and the Jovanovic competitive isotherm equations. The best results were obtained with the 11-parameter quadratic isotherm defined by the ratio of two second-degree polynomials, which takes into account all molecular interactions in both the solution and the sorbed monolayer. The Jovanovic model was used to derive a relationship widely applied to predict reversed-phase chromatography retention data as a function of aqueous binary mobile phases. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. CTR QUIM FARMACEUT,DEPT TECNOL,HAVANA 11600,CUBA. NR 34 TC 20 Z9 20 U1 0 U2 5 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 MAY 17 PY 1996 VL 734 IS 1 BP 83 EP 96 DI 10.1016/0021-9673(95)01162-5 PG 14 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500007 ER PT J AU Yun, T Guiochon, G AF Yun, T Guiochon, G TI Modeling of radial heterogeneity in chromatographic columns .2. Separation of a two-component mixture on a column with cylindrical symmetry SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT Symposium on Preparative Chromatography (PREP 95) CY JUN 11-14, 1995 CL GEORGETOWN UNIV CONF CTR, WASHINGTON, DC SP Washington Chromatogr Discuss Grp HO GEORGETOWN UNIV CONF CTR DE elution band profiles; band profiles; cylindrical symmetry; columns, radially heterogeneous cylindrical ID DIAMETER AB The elution band profiles of two partially separated components were calculated for a radially heterogeneous cylindrical column, using a modified equilibrium-dispersive model, assuming no radial dispersion. Steady-state flow-rate is assumed with a given cylindrical radial distribution of the velocity. The results show a marked degradation of the column performance when the ratio of the mobile-phase velocities at the column center and at the wall differs from unity by more than a few percent. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 11 TC 23 Z9 23 U1 0 U2 0 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 MAY 17 PY 1996 VL 734 IS 1 BP 97 EP 103 DI 10.1016/0021-9673(95)01102-1 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500008 ER PT J AU Staerk, DU Shitangkoon, A Winchester, E Vigh, G Felinger, A Guiochon, G AF Staerk, DU Shitangkoon, A Winchester, E Vigh, G Felinger, A Guiochon, G TI Determination of the gas-liquid partition isotherms of the enantiomers of methyl 2-chloropropionate on trichloroacetyl pentyl beta-cyclodextrin using the elution by characteristic points method SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT Symposium on Preparative Chromatography (PREP 95) CY JUN 11-14, 1995 CL GEORGETOWN UNIV CONF CTR, WASHINGTON, DC SP Washington Chromatogr Discuss Grp HO GEORGETOWN UNIV CONF CTR DE preparative chromatography; partition isotherms; elution by characteristic points method; enantiomer separation; methyl 2-chloropropionate ID ADSORPTION-ISOTHERM; ENERGY-DISTRIBUTION; CHROMATOGRAPHY AB The gas-liquid partition isotherms of the enantiomers of methyl 2-chloropropionate on a trichloroacetyl pentyl beta-cyclodextrin stationary phase were determined at three different temperatures using the elution by characteristic points method. The isotherms were described using the single-component and competitive bi-Langmuir isotherm equations. The measured and calculated isotherms as well as the retention factor and separation selectivity data agree, indicating that these isotherms might be suitable for the modeling of the preparative-scale gas chromatographic separation of the enantiomers. C1 TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Felinger, Attila/A-1595-2008 OI Felinger, Attila/0000-0001-7130-1968 NR 22 TC 10 Z9 10 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 MAY 17 PY 1996 VL 734 IS 1 BP 155 EP 162 DI 10.1016/0021-9673(95)01130-7 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UQ855 UT WOS:A1996UQ85500013 ER PT J AU Spevak, W Dasgupta, F Hobbs, CJ Nagy, JO AF Spevak, W Dasgupta, F Hobbs, CJ Nagy, JO TI An efficient synthesis of N-allylglycosylamides from unprotected carbohydrates SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID OLIGOSACCHARIDES; GLYCOSYLAMINES; GLYCOSIDES AB Synthetic, multivalent, carbohydrate assemblies are important tools in studying the avidity of many naturally occuring lectins for their ligands. This report details a simple, high-yielding three-step procedure to convert unprotected carbohydrates into N-allylglycosides. This method compliments the reductive amination procedure but allows the reducing-end pyranose ring to remain intact. No carbohydrate protecting groups are needed, and the resulting N-allylglycosylamide can be easily linked to other molecules. Two examples of analogs of silyl Lewis(x) and sulfo Lewis(x) have been derivatized by this process. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. GLYCOMED INC,ALAMEDA,CA 94501. NR 34 TC 20 Z9 20 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAY 17 PY 1996 VL 61 IS 10 BP 3417 EP 3422 DI 10.1021/jo9522522 PG 6 WC Chemistry, Organic SC Chemistry GA UL943 UT WOS:A1996UL94300032 ER PT J AU Bowman, CD AF Bowman, CD TI What happened at Chernobyl? SO SCIENCE LA English DT Letter RP Bowman, CD (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 17 PY 1996 VL 272 IS 5264 BP 936 EP 936 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UL619 UT WOS:A1996UL61900005 ER PT J AU Fischer, RU Congdon, JD Brock, M AF Fischer, RU Congdon, JD Brock, M TI Total body electrical conductivity (TOBEC): A tool to estimate lean mass and nonpolar lipids of an aquatic organism? SO COPEIA LA English DT Article ID BIRDS; FAT C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. DUKE UNIV,DEPT BIOL,DURHAM,NC 27706. RP Fischer, RU (reprint author), EASTERN ILLINOIS UNIV,DEPT ZOOL,CHARLESTON,IL 61920, USA. NR 10 TC 14 Z9 15 U1 0 U2 0 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS BUSINESS OFFICE PI CARBONDALE PA SOUTHERN ILLINOIS UNIV, DEPT ZOOLOGY, CARBONDALE, IL 62901-6501 SN 0045-8511 J9 COPEIA JI Copeia PD MAY 16 PY 1996 IS 2 BP 459 EP 462 DI 10.2307/1446865 PG 4 WC Zoology SC Zoology GA UM949 UT WOS:A1996UM94900024 ER PT J AU KunzSchughart, LA Groebe, K MuellerKlieser, W AF KunzSchughart, LA Groebe, K MuellerKlieser, W TI Three-dimensional cell culture induces novel proliferative and metabolic alterations associated with oncogenic transformation SO INTERNATIONAL JOURNAL OF CANCER LA English DT Article ID MULTICELLULAR SPHEROIDS; RAS ONCOGENES; EMBRYO FIBROBLASTS; GROWTH SATURATION; OXYGEN; MYC; RESISTANCE; NECROSIS; CANCER; TUMORS AB To date, cell biological characteristics of oncogene-transfected cells have been investigated either in relatively homogeneous monolayer cultures or in heterogeneous tumors in vivo. To evaluate the emergence of cellular heterogeneity during tumor formation, we have established a multicellular spheroid system from an oncogene-dependent, genetically determined 2-stage carcinogenesis model for 3-dimensional growth under well-defined conditions. the effect of T24Ha-ras transfection on cellular growth, proliferation, cell viability and oxygenation was investigated using spontaneously immortalized (Rat1) and c-myc-transfected (M1) Fisher 344 rat embryo fibroblasts and a tumorigenic T24Ha-ras-transfected clone of each (Rat1-T1 and MRI). Spheroid volume growth curves and [H-3]thymidine autoradiographs clearly demonstrated that spheroids better reflect the degree of tumorigenicity in vivo as opposed to monolayer cultures. Studies on Rat1 and M1 aggregates showed that the potential for tumor formation of Rat1 cells might be manifested in vitro as an increased capability of the cells to survive in 3D culture. pO(2) measurements confirmed that neither cell quiescence nor cell death in the pseudo-normal cell aggregate types is due to an oxygen deficiency. In contrast, depletion of oxygen coincided with necrotic cell death in Rat1-T1 spheroids and proliferation arrest in MR1 cultures. Cell-line-specific attributes in 3D culture that were not specifically related to ros transfection of the cells included histological structure, development of necrosis and thickness of viable cell rim. However, growth behavior, proliferation characteristics and their association with the oxygen supply might be correlated with the extent of transformation. (C) 1996 Wiley-Liss, Inc. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. UNIV MAINZ,INST PHYSIOL & PATHOPHYSIOL,D-55128 MAINZ,GERMANY. NR 30 TC 43 Z9 44 U1 1 U2 9 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7136 J9 INT J CANCER JI Int. J. Cancer PD MAY 16 PY 1996 VL 66 IS 4 BP 578 EP 586 DI 10.1002/(SICI)1097-0215(19960516)66:4<578::AID-IJC25>3.0.CO;2-2 PG 9 WC Oncology SC Oncology GA UL260 UT WOS:A1996UL26000025 PM 8635877 ER PT J AU Tardy, DC Kuo, SC Zhang, ZY Klemm, RB AF Tardy, DC Kuo, SC Zhang, ZY Klemm, RB TI Ionization energy of tert-butyl-d(9) alcohol and the appearance energy of protonated acetone: A nonequilibrium dissociation SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VIBRATIONAL-ENERGY; PHOTOIONIZATION; IONS; FLOW; DYNAMICS; RADICALS; HEATS AB In the present photoionization study of tert-butyl alcohol, the parent ion of the deuterated isotopomer [(CD3)(3)-COH] was observed and an ionization energy (IE) of 9.82 +/- 0.02 eV was derived from a step-function threshold at 126.25 nm. The appearance energies (AE's) of (CD3)(2)COH+ and (CH3)(2)COH+ were also determined (at 298 K) to be 9.84 +/- 0.02 and 9.86 +/- 0.02 eV, respectively. From these results, the IE of undeuterated tert-butyl alcohol (which was not observed) was estimated to be 9.84 +/- 0.03 eV. The difference between the IE and the derived AE(0) (AE = 10.01 +/- 0.03 eV at 0 K) implies an upper limit of 0.17 +/- 0.04 eV for the barrier to dissociation of (CH3)(3)COH+. A recent evaluation of the proton affinity of acetone was employed to derive a value of 5.40 +/- 0.10 eV for Delta(f)H degrees(0)[(CH3)(2)COH+] and, thence, the enthalpy of reaction, Delta(f)H degrees(0) = 9.87 +/- 0.11 eV; and from this, an upper limit of 0.14 +/- 0.11 eV for the reverse barrier of the dissociation was obtained. RRKM calculations were performed by using the energies derived from the experimental (and estimated) values. For excitation energies greater than or equal to 0.2 eV above threshold, RRKM calculations yield large rate coefficients for dissociation. Also, the kinetic energy release (KER) was calculated for various models of the dissociation complex. The calculated KER's are consistent with experimental values when it is assumed that only 5 of the 38 vibrational modes of the transition state are active in the randomization of internal energy. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP Tardy, DC (reprint author), UNIV IOWA,DEPT CHEM,IOWA CITY,IA 52242, USA. NR 34 TC 2 Z9 2 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1996 VL 100 IS 20 BP 8144 EP 8150 DI 10.1021/jp953219m PG 7 WC Chemistry, Physical SC Chemistry GA UL282 UT WOS:A1996UL28200018 ER PT J AU Shin, YK Brunschwig, BS Creutz, C Sutin, N AF Shin, YK Brunschwig, BS Creutz, C Sutin, N TI Electroabsorption spectroscopy of charge-transfer states of transition-metal complexes .2. Metal-to-ligand and ligand-to-metal charge-transfer excited states of pentaammineruthenium complexes SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID DIPOLE-MOMENTS; AMMINE COMPLEXES; SINGLET-STATE; RUTHENIUM(II); CONDUCTIVITY; BEHAVIOR; SPECTRA AB The absorption spectra of Ru-II(NH3)(5)L and Ru-III(NH3)(5)L (L is an aromatic N-heterocycle or nitrile) complexes in 50:50 glycerol-water glasses at 77 K (D-s = 3.9) are a function of the applied field in the 10(6)-10(7) V/m range. Analysis of the spectra in terms of the Liptay equations yields ground-excited state dipole-moment differences ranging from 4 to 37 D, depending upon the nature of L. The measured dipole moment differences, particularly those for the MLCT transitions, are much smaller than the values estimated from a simple consideration of the electron-transfer distances. The discrepancy between the observed and naive dipole-moment estimates arises mainly from the multielectron nature of the response to excitation. Good agreement is obtained with the predictions of a model which includes refinement of the effective electron-transfer distance, the shift in the valence electron distribution in the excited state, and the effects of electron delocalization (pi-backbonding for Ru(II) and pi-bonding for the Ru(III) complexes). Other contributions, namely the dipole moment induced by the NH3 ligands and by the surrounding solvent molecules, are also considered. C1 BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. RI Brunschwig, Bruce/G-4249-2011 NR 48 TC 132 Z9 132 U1 2 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1996 VL 100 IS 20 BP 8157 EP 8169 DI 10.1021/jp953395v PG 13 WC Chemistry, Physical SC Chemistry GA UL282 UT WOS:A1996UL28200020 ER PT J AU Martin, MZ Desai, SR Feigerle, CS Miller, JC AF Martin, MZ Desai, SR Feigerle, CS Miller, JC TI Chemistry in clusters: Synthesis of NO+(N2O3)(n) and NO2+(N2O3)(n) species SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MULTIPHOTON IONIZATION; VANDERWAALS CLUSTERS; NITRIC-OXIDE; SPECTROSCOPY; MOLECULES; NO AB Mixed clusters were produced by expansion of an NO/CH4/Ar/H2O mixture (5%, 5%, 90%, trace) in a supersonic jet. Ionization of the clusters with 30 ps, 266 nm laser pulses resulted in the virtually 100% conversion to NO+ (N2O3)(n) and NO2+(N2O3)(n) cluster ions subsequently detected in a time-of-flight mass spectrometer. Some incomplete conversion was evidenced by the detection of (NO)(m)(+)(N2O3)(n) ions with m > 1. The identity of the product ions was confirmed by the use of isotopically substituted nitric oxide and the role of the water was investigated using O-18-substituted H2O. Possible photochemical mechanisms are discussed. C1 OAK RIDGE NATL LAB, CHEM & BIOL PHYS SECT, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT CHEM, KNOXVILLE, TN 37996 USA. RI Martin, Madhavi/A-5268-2011 NR 34 TC 14 Z9 14 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1996 VL 100 IS 20 BP 8170 EP 8174 DI 10.1021/jp953337+ PG 5 WC Chemistry, Physical SC Chemistry GA UL282 UT WOS:A1996UL28200021 ER PT J AU Piocos, EA Werst, DW Trifunac, AD Eriksson, LA AF Piocos, EA Werst, DW Trifunac, AD Eriksson, LA TI Radical ions of acetylene in ZSM5 zeolites: An EPR and theoretical study SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VINYLIDENE REARRANGEMENT; MATRIX-ISOLATION; EXCHANGE-ENERGY; H-MORDENITE; CATIONS; BENZENE; ESR; APPROXIMATION; METHYLACETYLENE; CYCLOBUTADIENE AB The cis-bent form of the acetylene radical anion (a(iso)(H) = 65 G) was observed following radiolysis of acetylene-loaded HZSM5 but not NaZSM5. The acetylene radical cation is not trapped by the matrix at 77 K and undergoes ion-molecule reactions to form multimer ions, including the benzene cation. Benzene is also formed by acid-catalyzed polymerization of acetylene on HZSM5. The evidence that acetylene (IP = 11.4 eV) is ionized places a new lower limit on the range of ionizable species in the radiolyzed zeolite. The energies, geometries, and hyperfine coupling constants were calculated for the acetylene, vinylidene, cyclobutadiene and butatriene radical anions and radical cations, and the benzene radical cation, using different levels of theory, including gradient-corrected density functional theory. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV STOCKHOLM,DEPT PHYS,S-11385 STOCKHOLM,SWEDEN. RI Eriksson, Leif/D-1226-2012 NR 70 TC 31 Z9 31 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1996 VL 100 IS 20 BP 8408 EP 8417 DI 10.1021/jp953294x PG 10 WC Chemistry, Physical SC Chemistry GA UL282 UT WOS:A1996UL28200056 ER PT J AU Williams, PT AF Williams, PT TI High-density lipoprotein cholesterol and other risk factors for coronary heart disease in female runners SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Article ID PHYSICAL-ACTIVITY; CARDIOVASCULAR-DISEASE; DISTANCE RUNNERS; ALCOHOL INTAKE; UNITED-STATES; FOLLOW-UP; WOMEN; EXERCISE; PREMENOPAUSAL; SUBFRACTIONS AB Background. Official guidelines from the Centers for Disease Control and Prevention assert that the majority of health benefits from physical activity are obtained by walking 2 miles (3.2 km) briskly most days of the week (the energy equivalent of running 8 to 12 km per week). The objective of our study was to examine the dose-response relation in women between risk factors for coronary heart disease, particularly the concentration of high-density lipoprotein (HDL) cholesterol, and vigorous exercise at levels that exceed the official guidelines. Methods. The number of kilometers run per week reported by 1837 female recreational runners in a national cross-sectional survey was compared with medical data provided by the women's physicians. Results. In these cross-sectional data, plasma HDL cholesterol concentrations were higher by an average (+/-SE) of 0.133+/-0.020 mg per deciliter (0.003+/-0.0005 mmol per liter) for every additional kilometer run per week, an amount nearly identical with that previously reported for men (0.136+/-0.006 mg per deciliter [0.004+/-0.0002 mmol per liter] per kilometer per week). Among women who ran less than 48 km per week, mean plasma HDL concentrations were significantly higher with each 16-km increment in distance. Women who ran more than 64 km per week had significantly higher mean concentrations of HDL cholesterol than did women who ran less than 48 km per week. They were also significantly more likely to have HDL cholesterol concentrations greater than 100, 90, or 80 mg per deciliter (2.6, 2.3, or 2.1 mmol per liter) than were women running less than 64 km per week. HDL cholesterol concentrations increased significantly in relation to the number of kilometers run per week in premenopausal women who were not using oral contraceptives and in postmenopausal women, whether they were receiving estrogen-replacement therapy or not. Conclusions. Substantial increases in HDL cholesterol concentrations were found in women who exercised at levels exceeding current guidelines; higher HDL cholesterol concentrations could provide added health benefits to these women. RP Williams, PT (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 934,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL-45652, HL-55640] NR 41 TC 123 Z9 124 U1 0 U2 1 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD MAY 16 PY 1996 VL 334 IS 20 BP 1298 EP 1303 DI 10.1056/NEJM199605163342004 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA UK880 UT WOS:A1996UK88000004 PM 8609947 ER PT J AU Bartels, J Forshaw, JR Lotter, H Wusthoff, M AF Bartels, J Forshaw, JR Lotter, H Wusthoff, M TI Diffractive production of vector mesons at large t SO PHYSICS LETTERS B LA English DT Article ID ELASTIC-SCATTERING; QCD; PP AB The cross section for elastic vector meson production in photon-proton interactions at large t is considered using the exact analytic solution of the BFKL equation in the azimuthally symmetric n = 0 limit. We use a non-relativistic model for the vector meson production and find a small shrinkage in the t-distribution with increasing energy. C1 UNIV MANCHESTER,MANCHESTER M13 9PL,LANCS,ENGLAND. ARGONNE NATL LAB,HIGH ENERGY PHYS DIV,ARGONNE,IL. RP Bartels, J (reprint author), UNIV HAMBURG,INST THEORET PHYS,W-2000 HAMBURG,GERMANY. NR 11 TC 70 Z9 70 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 MAY 16 PY 1996 VL 375 IS 1-4 BP 301 EP 309 DI 10.1016/0370-2693(96)00203-1 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UP263 UT WOS:A1996UP26300045 ER PT J AU Phillips, MS Fujii, J Khanna, VK DeLeon, S Yokobata, K deJong, PJ MacLennan, DH AF Phillips, MS Fujii, J Khanna, VK DeLeon, S Yokobata, K deJong, PJ MacLennan, DH TI The structural organization of the human skeletal muscle ryanodine receptor (RYR1) gene SO GENOMICS LA English DT Article ID HUMAN-MALIGNANT HYPERTHERMIA; PROBABLE CAUSAL MUTATION; SARCOPLASMIC-RETICULUM; GENOMIC ORGANIZATION; SEQUENCE STATISTICS; SPLICE JUNCTIONS; CALCIUM-CHANNEL; DYSTROPHIN GENE; CA-2+ RELEASE; PORCINE AB The RYR1 gene encoding the Ca2+ release channel of human skeletal muscle sarcoplasmic reticulum has been cloned and exon/intron boundaries have been determined, together with a minimum of 30 bp of intron sequence flanking each splice junction. The gene contains 106 exons, of which two are alternatively spliced. The length of the gene, determined by the alignment of 16 genomic phage clones, a cosmid. clone, and several long polymerase chain reaction products, is approximately 160 kb. Exons range from 15 to 813 bp, while introns range from 85 to about 16,000 bp, Analysis of the gene has confirmed published errors in the human RYR1 cDNA and confirmed the structure of two alternatively spliced exons. The numbering of the nucleotides comprising the RYR1 cDNA and the numbering of amino acids encoded by them were corrected to account for these earlier errors and omissions. Analysis of 2.4 kb of the 5' upstream sequence indicated the presence of a CCAAT box and several Spl binding sites between nucleotides -200 and -60 br,, flanking the proposed transcription start site at -130 bp. Several other potential transcription factor binding sites were identified throughout the 5' sequence. Knowledge of the structure of the RYR1 gene will provide an invaluable resource for the discovery of mutations in the gene that are causal of human malignant hyperthermia and central core disease. (C) 1990 Academic Press, Inc. C1 UNIV TORONTO,CHARLES H BEST INST,BANTING & BEST DEPT MED RES,TORONTO,ON M5G 1L6,CANADA. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL PROGRAM,LIVERMORE,CA 94550. NR 58 TC 115 Z9 116 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD MAY 15 PY 1996 VL 34 IS 1 BP 24 EP 41 DI 10.1006/geno.1996.0238 PG 18 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA UM824 UT WOS:A1996UM82400004 PM 8661021 ER PT J AU Iyer, GS Krahe, R Goodwin, LA Doggett, NA Siciliano, MJ Funanage, VL Proujansky, R AF Iyer, GS Krahe, R Goodwin, LA Doggett, NA Siciliano, MJ Funanage, VL Proujansky, R TI Identification of a testis-expressed creatine transporter gene at 16p11.2 and confirmation of the X-linked locus to Xq28 SO GENOMICS LA English DT Article ID PHOSPHATE AB Creatine and creatine phosphate act as a buffer system for the regeneration of ATP in tissues with fluctuating energy demands. Following reports of the cloning of a creatine transporter in rat, rabbit, and human, we cloned and sequenced a creatine transporter from a human intestinal cDNA library. PCR amplification of genomic DNAs from somatic cell hybrid panels localized two creatine transporter (CT) genes: CTI to Xq26-q28 and CT2 to 16p11.2. Refinement of CT1 to Xq28 was confirmed by FISH, Identification of CT2 sequences in YACs and cosmid contigs that had been ordered on human chromosome 16 enabled its assignment to the proximal end of 16p11.2. Sequencing of the CT2 gene identified sequence differences between CTI and CT2 transcripts that were utilized to determine that CT2 is expressed in testis only. CT2 is the most proximally identified gene on chromosome 16p to date, The existence of an autosomal, testis-specific form of the human creatine transporter gene suggests that creatine transporter activity is critical for normal function of spermatazoa following meiosis. (C) 1996 Academic Press, Inc. C1 ALFRED I DUPONT INST,DIV GASTROENTEROL & NUTR,DEPT CLIN SCI,NEMOURS RES PROGRAMS,WILMINGTON,DE 19899. THOMAS JEFFERSON UNIV,JEFFERSON MED COLL,DEPT PEDIAT,PHILADELPHIA,PA 19107. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM. UNIV TEXAS,MD ANDERSON CANCER CTR,DEPT MOLEC GENET,HOUSTON,TX 77030. FU NCI NIH HHS [CA34936] NR 17 TC 45 Z9 46 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD MAY 15 PY 1996 VL 34 IS 1 BP 143 EP 146 DI 10.1006/geno.1996.0254 PG 4 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA UM824 UT WOS:A1996UM82400020 PM 8661037 ER PT J AU Zandt, G Beck, SL Ruppert, SR Ammon, CJ Rock, D Minaya, E Wallace, TC Silver, PG AF Zandt, G Beck, SL Ruppert, SR Ammon, CJ Rock, D Minaya, E Wallace, TC Silver, PG TI Anomalous crust of the Bolivian Altiplano, central Andes: Constraints from broadband regional seismic waveforms SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID WAVES AB A one-year deployment of broadband seismographs in the Bolivian Altiplano recorded numerous intermediate-depth earthquakes at near-regional distances. We modeled the associated broadband waveforms of two earthquakes to estimate an average crustal structure for the Altiplano. The resulting model is characterized by an anomalously low mean P velocity of 6.0 km/s, a low Poisson's ratio of 0.25, and a crustal thickness of 65 km. The combination of the low mean velocity and low Poisson's ratio can be explained only by a predominantly quartz-rich, felsic bulk composition. This constraint precludes significant volumes of magmatic addition from the mantle contributing to the great thickness of the Altiplano crust, but is consistent with thickening by compressive shortening concentrated in a weak felsic layer. C1 ST LOUIS UNIV,DEPT EARTH & ATMOSPHER SCI,ST LOUIS,MO 63103. OBSERV SAN CALIXTO,LA PAZ,BOLIVIA. LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. CARNEGIE INST WASHINGTON,DEPT TERR MAGNETISM,WASHINGTON,DC 20015. RP Zandt, G (reprint author), UNIV ARIZONA,DEPT GEOSCI,TUCSON,AZ 85721, USA. NR 25 TC 51 Z9 52 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAY 15 PY 1996 VL 23 IS 10 BP 1159 EP 1162 DI 10.1029/96GL00967 PG 4 WC Geosciences, Multidisciplinary SC Geology GA UM113 UT WOS:A1996UM11300025 ER PT J AU Cass, RJ Benzley, SE Meyers, RJ Blacker, TD AF Cass, RJ Benzley, SE Meyers, RJ Blacker, TD TI Generalized 3-D paving: An automated quadrilateral surface mesh generation algorithm SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE meshing; three-dimensional; surfaces; quadrilateral; finite element AB This paper discusses the extension of the paving algorithm for all quadrilateral mesh generation to arbitrary three-dimensional trimmed surfaces. Methods of calculating angles, projecting elements, and detecting collisions between paving boundaries, for general surfaces are presented. Extensions of the smoothing algorithms for three dimensions are set forth. Advances in the use of scalar sizing functions are presented. These functions can be used to better approximate internal mesh density from boundary densities and surface characteristics. C1 SANDIA NATL LABS,COMPUTAT MECH & VISUALIZAT DEPT,ALBUQUERQUE,NM 87185. RP Cass, RJ (reprint author), BRIGHAM YOUNG UNIV,DEPT CIVIL ENGN,368 CB PROVO,PROVO,UT 84602, USA. NR 17 TC 62 Z9 71 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD MAY 15 PY 1996 VL 39 IS 9 BP 1475 EP 1489 DI 10.1002/(SICI)1097-0207(19960515)39:9<1475::AID-NME913>3.3.CO;2-N PG 15 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA UG996 UT WOS:A1996UG99600003 ER PT J AU Antonell, MJ Jones, KS Haynes, TE AF Antonell, MJ Jones, KS Haynes, TE TI Carbon incorporation for strain compensation during solid phase epitaxial recrystallization of SiGe on Si at 500-600 degrees C SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HETEROJUNCTION BIPOLAR-TRANSISTORS; HETEROSTRUCTURES; KINETICS; SILICON; GROWTH; IMPLANTATION; SI1-XGEX; GESI/SI AB Transmission electron microscopy has been combined with time-resolved reflectivity and ion channeling to study the effects of carbon doping on solid-phase epitaxial regrowth (SPER) of strained 2000 Angstrom, Si0.88Ge0.12Si alloy layers grown by molecular-beam epitaxy (MBE). Relative to the undoped layers, carbon incorporation in the MBE grown SiGe layers prior to regrowth at moderate temperatures (500-700 degrees C) has three main effects on SPER. These include a reduction in SPER rate, a delay in the onset of strain-relieving defect formation, and a sharpening of the amorphous/crystalline (a/c) interface, i.e., promotion of a two-dimensional (planar) growth front. These results suggest that C incorporated during SPER reduces the lattice-mismatch strain. (C) 1996 American Institute of Physics. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP Antonell, MJ (reprint author), UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611, USA. RI Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 24 TC 4 Z9 4 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7646 EP 7651 DI 10.1063/1.362428 PG 6 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600027 ER PT J AU Roth, J Graupner, H Withrow, SP Zehner, D Zuhr, RA AF Roth, J Graupner, H Withrow, SP Zehner, D Zuhr, RA TI Chemical interaction of Si, Ti, and Mo with graphite surfaces SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; SILICON-CARBIDE POWDERS; PYROLYTIC-GRAPHITE; D+ IRRADIATION; FE FILMS; XPS; TEMPERATURE; GROWTH; PHASE AB The interaction of Si, Ti, and Mo atoms with pyrolytic graphite substrates has been studied for evaporated layers of about 100 nm and implanted ions with mean ranges between 2 and 4 nm. In the temperature range from room temperature to 1800 K the thermal diffusion of carbon into the evaporated layers has been studied by Rutherford backscattering spectroscopy while the temperature dependence of the carbide formation has been studied by x-ray photoelectron spectroscopy. For all three systems stable carbidic phases are predicted by equilibrium phase diagrams. For Ti the formation of TiC is already observed after room temperature implantation, while for Mo annealing to 1200 K is necessary for Mo2C formation. In the case of Si oxygen contamination due to the air transfer after implantation resulted in a mixed SiOxCy phase which only transformed into a SiC phase at temperatures above 900 K, where the oxygen was released. The temperature range of stability of the carbidic layers was found to be correlated to the melting temperature of the metal-carbide eutectic. Above this temperature the metal atoms rapidly dissolve in the graphite lattice. (C) 1996 American Institute of Physics. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP Roth, J (reprint author), MAX PLANCK INST PLASMA PHYS,EURATOM ASSOC,POB 1533,D-85740 GARCHING,GERMANY. NR 35 TC 12 Z9 12 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7695 EP 7702 DI 10.1063/1.362673 PG 8 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600035 ER PT J AU Albrecht, JD Cong, L Ruden, PP Nathan, MI Smith, DL AF Albrecht, JD Cong, L Ruden, PP Nathan, MI Smith, DL TI Resonant tunneling in (001)- and (111)-oriented III-V double-barrier heterostructures under transverse and longitudinal stresses SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BAND-STRUCTURE; GAAS; ALAS AB Calculations of the effects of external stress on the current-voltage characteristics of double-barrier (001)- and (111)-oriented resonant tunneling devices are presented. Crystal strains arising from the application of external pressure and, in pseudomorphic structures, lattice mismatch cause shifts in the conduction and valence bands of the well and barrier layers with respect to the unstrained alignment. For certain stress orientations piezoelectric effects give rise to internal electric fields parallel to the current direction. The combined piezoelectric and band-structure effects modulate the transmission resonances which control the shape of the current versus voltage characteristics of the structures. (C) 1996 American Institute of Physics. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Albrecht, JD (reprint author), UNIV MINNESOTA,DEPT ELECT ENGN,MINNEAPOLIS,MN 55455, USA. NR 23 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7763 EP 7769 DI 10.1063/1.362381 PG 7 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600046 ER PT J AU Weitering, HH Sullivan, JP Carolissen, RJ PerezSandoz, R Graham, WR Tung, RT AF Weitering, HH Sullivan, JP Carolissen, RJ PerezSandoz, R Graham, WR Tung, RT TI Inhomogeneous Schottky barriers at Ag/Si(111) and Ag/Si(100) interfaces SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID METAL-SEMICONDUCTOR INTERFACES; EPITAXIAL PB/SI(111) INTERFACES; 1ST-PRINCIPLES CALCULATIONS; ELECTRONIC-STRUCTURE; GAP STATES; SURFACE; SI(111); CONTACTS; SILICON; HEIGHT AB We have measured current-voltage and capacitance-voltage characteristics of epitaxial Si(111)7x7-Ag, Si(111)(root 3x root 3)R30 degrees-Ag, Si(100)2x1-Ag, and polycrystalline Ag/Si interfaces, using different doping levels for both n- and p-type silicon wafers. Our data strongly suggest that the Schottky barrier heights (SBHs) are spatially nonuniform. The distribution of local effective SBHs at the epitaxial interfaces is modeled by a summation of a single Gaussian, representing the spread in SBH for the majority of the contact, and two half-Gaussians which represent the high- and low-barrier tails of the full distribution. Despite the fact that the average SBHs of the epitaxial interfaces are hardly structure dependent, the SBH distributions are very broad and markedly different for each interface. The polycrystalline interfaces are characterized by a narrower SBH distribution centered at a substantially smaller mean. We argue that the electrical inhomogeneity is related to structural inhomogeneity at the interface which is a direct consequence of the kinetics and mode of growth of Ag on Si. (C) 1996 American Institute of Physics. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. UNIV PENN, DEPT MAT SCI & ENGN, PHILADELPHIA, PA 19104 USA. AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. RP UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. NR 59 TC 35 Z9 37 U1 1 U2 10 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7820 EP 7829 DI 10.1063/1.362390 PG 10 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600055 ER PT J AU Zasadzinski, R Vandervoort, KG Crabtree, GW AF Zasadzinski, R Vandervoort, KG Crabtree, GW TI Study of the proximity effect in Nb/Au, Bi2Sr2CaCu2O8+y/Au, and HgBa2CuO4/Ag using a scanning tunneling microscope SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SPECTROSCOPY; GAP; NB AB Proximity effect gaps were observed consistently in Nb/Au, Bi2Sr2CaCu2O8+y/Au, and HgBa2CuO4/Ag bilayers using a low temperature scanning tunneling microscope. The Nb/Au conductance curves [dl(V)/dV vs V] were fit by the Arnold model, using the accepted energy gap value of Nb, 1.55 meV. The application of gold and silver overlayers allowed vacuum tunneling and topographic images of BSCCO single crystals and the HgBa2CuO4 polycrystalline sample. Cleavage steps of varying sizes (up to 1500 Angstrom) in the BSCCO/Au sample were observed, and gaplike features were found on such steps. Consistent, reproducible energy gaps were also found in the Hg-compound sample. (C) 1996 American Institute of Physics. C1 IIT, CHICAGO, IL 60160 USA. RP ARGONNE NATL LAB, DIV MAT SCI, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 20 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7843 EP 7848 DI 10.1063/1.362373 PG 6 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600058 ER PT J AU Maya, L Paranthaman, M Thompson, JR Thundat, T Stevenson, RJ AF Maya, L Paranthaman, M Thompson, JR Thundat, T Stevenson, RJ TI Ferromagnetic nanocomposite films of cobalt in a ceramic matrix formed by thermal decomposition of cobalt nitride, CoN, precursor SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MAGNETIC-PROPERTIES; N FILMS; PARTICLES; FE; NICKEL; METALS AB Cobalt nitride films, CoN, in a pure form and also as a nanocomposite in boron nitride or silicon nitride were generated by reactive sputtering of cobalt metal, cobalt boride, or cobalt silicide as targets, respectively, in a nitrogen plasma. Cobalt nitride decomposes into the elements by heating under vacuum at 500 degrees C. The nanostructure of the composites was preserved in the heating treatment thus creating a fine dispersion (<10 nm) of cobalt particles, in a ceramic matrix. The magnetic properties of the nanocomposites were established. The precursor cobalt nitride is paramagnetic while the cobalt dispersions, having dimensions smaller than single magnetic domain, show characteristics typical of those systems such as superparamagnetism and, at temperatures lower than the blocking temperature, marked hysteresis. The coercive fields at 5 K for the BN and Si3N4 nanocomposites are 3250 and 850 Oe, respectively. These films are of interest as data recording media. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,HLTH SCI RES DIV,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,TECH DIV,OAK RIDGE,TN 37831. RP Maya, L (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI Paranthaman, Mariappan/N-3866-2015 OI Paranthaman, Mariappan/0000-0003-3009-8531 NR 26 TC 26 Z9 26 U1 5 U2 22 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7905 EP 7910 DI 10.1063/1.362402 PG 6 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600069 ER PT J AU Vanheusden, K Warren, WL Seager, CH Tallant, DR Voigt, JA Gnade, BE AF Vanheusden, K Warren, WL Seager, CH Tallant, DR Voigt, JA Gnade, BE TI Mechanisms behind green photoluminescence in ZnO phosphor powders SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PHOTO-ESR INVESTIGATIONS; CERAMICS; DEFECTS AB We explore the interrelationships between the green 510 nm emission, the free-carrier concentration, and the paramagnetic oxygen-vacancy density in commercial ZnO phosphors by combining photoluminescence, optical-absorption, and electron-paramagnetic-resonance spectroscopies. We find that the green emission intensity is strongly influenced by free-carrier depletion at the particle surface, particularly for small particles and/or low doping. Our data suggest that the singly ionized oxygen vacancy is responsible for the green emission in ZnO; this emission results from the recombination of a photogenerated hole with the singly ionized charge state of this defect. (C) 1996 American Institute of Physics. C1 TEXAS INSTRUMENTS INC,DALLAS,TX 75234. RP Vanheusden, K (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. RI Gnade, Bruce/C-2327-2008 NR 19 TC 2923 Z9 3036 U1 49 U2 460 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1996 VL 79 IS 10 BP 7983 EP 7990 DI 10.1063/1.362349 PG 8 WC Physics, Applied SC Physics GA UK226 UT WOS:A1996UK22600081 ER PT J AU Kendrick, B Pack, RT AF Kendrick, B Pack, RT TI Geometric phase effects in H+O-2 scattering .1. Surface function solutions in the presence of a conical intersection SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID DISCRETE VARIABLE REPRESENTATION; QUANTUM REACTIVE SCATTERING; POTENTIAL-ENERGY SURFACES; INTEGRAL CROSS-SECTIONS; THEORETICAL CHARACTERIZATION; TRIATOMIC-MOLECULES; WAVE-FUNCTIONS; ADIABATIC APPROXIMATION; ROVIBRATIONAL STATES; VIBRATIONAL LEVELS AB The general vector potential (gauge theory) approach for including geometric phase effects in accurate 3D quantum scattering calculations in hyperspherical coordinates is presented. A hybrid numerical technique utilizing both the DVR (discrete variable representation) and the FBR (finite basis representation) is developed. This method overcomes the singular behavior of the vector potential terms giving accurate surface function solutions to the complex Hermitian nuclear Schrodinger equation. The hybrid DVR/FBR technique is applied explicitly to HO2 for zero total angular momentum. The resulting complex surface functions include the geometric phase effects due to the C-2v conical intersection. The O-2 permutation symmetry is implemented to give real double-valued surface functions which exhibit both even and odd symmetry. The surface function eigenvalues are compared to calculations without the geometric phase. The results indicate that geometric phase effects should be significant for H+O-2 scattering even at low energies. (C) 1996 American Institute of Physics. RP LOS ALAMOS NATL LAB, DIV THEORET, T-12, MS-B268, LOS ALAMOS, NM 87545 USA. NR 117 TC 87 Z9 87 U1 0 U2 8 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 MAY 15 PY 1996 VL 104 IS 19 BP 7475 EP 7501 DI 10.1063/1.471460 PG 27 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UK935 UT WOS:A1996UK93500011 ER PT J AU Kendrick, B Pack, RT AF Kendrick, B Pack, RT TI Geometric phase effects in H+O-2 scattering .2. Recombination resonances and state-to-state transition probabilities at thermal energies SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID QUANTUM REACTIVE SCATTERING; THEORETICAL CHARACTERIZATION; 3 PARTICLES; TIME DELAYS; DYNAMICS; SURFACE; MATRIX; HO2 AB The general vector potential (gauge theory) approach for including geometric phase effects in accurate 3D quantum scattering calculations in hyperspherical coordinates is applied to low-energy (thermal) H+O-2 collisions. The hybrid DVR/FBR (discrete variable representation/finite basis representation) numerical technique is used to obtain accurate surface function solutions which include geometric phase effects due to the C-2v conical intersection in HO2. The relevant potential coupling and overlap matrices are constructed and a log-derivative matrix of solutions to the coupled-channel radial equations is propagated and transformed to obtain the scattering matrix S. The results for zero total angular momentum (J=0) show significant shifts in the resonance energies and lifetimes. Significant changes in the state-to-state transition probabilities are also observed. The results indicate that geometric phase effects must be included for H+O-2 scattering even at low energies. (C) 1996 American Institute of Physics. RP Kendrick, B (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-12,MS-B268,LOS ALAMOS,NM 87545, USA. NR 32 TC 75 Z9 75 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1996 VL 104 IS 19 BP 7502 EP 7514 DI 10.1063/1.471461 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UK935 UT WOS:A1996UK93500012 ER PT J AU Mosesson, MW Siebenlist, KR Hainfeld, JF Wall, JS Soria, J Soria, C Caen, JP AF Mosesson, MW Siebenlist, KR Hainfeld, JF Wall, JS Soria, J Soria, C Caen, JP TI The relationship between the fibrinogen D domain self-association/cross-linking site (gamma XL) and the fibrinogen Dusart abnormality (A alpha R554C-albumin). Clues to thrombophilia in the ''Dusart Syndrome'' SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Article DE fibrinogen; fibrin; factor XIII; plasminogen; thrombophilia ID ELECTRON-MICROSCOPY; BINDING-SITE; POLYMERIZATION; DERIVATIVES; HETEROGENEITIES; IDENTIFICATION; FRAGMENTS; CHAINS; BLOOD AB Cross-linking of fibrinogen at its COOH-terminal gamma chain cross-linking site occurs in the presence of factor XIIIa due to self-association at a constitutive D domain site (''gamma XL''). We investigated the contribution of COOH-terminal regions of fibrinogen Act chains to the gamma XL site by comparing the gamma chain cross-linking rate of intact fibrinogen (fraction I-2) with that of plasma fraction I-9, plasmic fraction I-9D, and plasmic fragment D-1, which lack COOH-terminal A alpha chain regions comprising similar to 100, similar to 390, and 413 residues, respectively, The cross-linking rates were I-2 > I-9 > I-9D = D-1, and indicated that the terminal 100 or more ACL chain residues enhance gamma XL site association. Fibrinogen Dusart, whose structural abnormality is in the COOH-terminal ''alpha C'' region of its A alpha chain (A alpha R554C-albumin), is associated with thrombophilia (''Dusart Syndrome''), and is characterized functionally by defective fibrin polymerization and clot structure, and reduced plasminogen binding and tPA-induced fibrinolysis, In the presence of XIIIa, the Dusart fibrinogen gamma chain cross-linking rate was about twice that of normal, but was normalized in proteolytic fibrinogen derivatives lacking the A alpha chain abnormality, as was reduced plasminogen binding. Electron microscopy showed that albumin-bound Dusart fibrinogen ''alpha C'' regions were located in the vicinity of D domains, rather than at their expected tethered location near the fibrinogen E domain, In addition, there was considerable fibrinogen aggregation that was attributable to increased intermolecular COOH-terminal A alpha chain associations promoted by untethered Dusart fibrinogen aC domains. We conclude that enhanced Dusart fibrinogen self-assembly is mediated through its abnormal alpha C domains, leads to increased gamma XL self-association and gamma chain cross-linking potential, and contributes to the thrombophilia that characterizes the ''Dusart Syndrome.'' (J. Clin. Invest. 1996. 97:2342-2350.) C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. HOP LARIBOISIERE,INSERM U353,F-75475 PARIS,FRANCE. HOP HOTEL DIEU,F-75181 PARIS,FRANCE. INST VAISSEAUX & SANG,PARIS,FRANCE. RP Mosesson, MW (reprint author), UNIV WISCONSIN,SCH MED,SINAI SAMARITAN MED CTR,945 N 12TH ST,MILWAUKEE CLIN CAMPUS,MILWAUKEE,WI 53233, USA. FU NCRR NIH HHS [RR-01777]; NHLBI NIH HHS [HL-47000] NR 46 TC 33 Z9 35 U1 0 U2 1 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD MAY 15 PY 1996 VL 97 IS 10 BP 2342 EP 2350 DI 10.1172/JCI118677 PG 9 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA UM574 UT WOS:A1996UM57400024 PM 8636415 ER PT J AU Asher, WE Karle, LM Higgins, BJ Farley, PJ Monahan, EC Leifer, IS AF Asher, WE Karle, LM Higgins, BJ Farley, PJ Monahan, EC Leifer, IS TI The influence of bubble plumes on air-seawater gas transfer velocities SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID CO2 UPTAKE; EXCHANGE; OCEAN; WATER; SURFACE; MARINE; INTERFACE; WAVES; MODEL; FLUX AB Laboratory results have demonstrated that bubble plumes are a very efficient air-water gas transfer mechanism. Because breaking waves generate bubble plumes, it could be possible to correlate the air-sea gas transport velocity k(L) with whitecap coverage. This correlation would then allow k(L) to be predicted from measurements of apparent microwave brightness temperature through the increase in sea surface microwave emissivity associated with breaking waves. In order to develop this remote-sensing-based method for predicting air-sea gas fluxes, a whitecap simulation tank was used to measure evasive and invasive k(L) values for air-seawater transfer of carbon dioxide, oxygen, helium, sulfur hexafluoride, and dimethyl sulfide at cleaned and surfactant-influenced water surfaces. An empirical model has been developed that can predict k(L) from bubble plume coverage, diffusivity, and solubility. The observed dependence of k(L) on molecular diffusivity and aqueous-phase solubility agrees with the predictions of modeling studies of bubble-driven air-water gas transfer. It has also been shown that soluble surfactants can decrease k(L) even in the presence of breaking waves. C1 PACIFIC NW NATL LAB, MARINE SCI LAB, SEQUIM, WA 98382 USA. GEORGIA INST TECHNOL, SCH EARTH & ATMOSPHER SCI, ATLANTA, GA 30332 USA. UNIV CONNECTICUT, INST MARINE SCI, GROTON, CT 06340 USA. NR 43 TC 77 Z9 78 U1 1 U2 10 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1996 VL 101 IS C5 BP 12027 EP 12041 DI 10.1029/96JC00121 PG 15 WC Oceanography SC Oceanography GA UL258 UT WOS:A1996UL25800012 ER PT J AU Knauf, JA Pendergrass, SH Marrone, BL Strniste, GF MacInnes, MA Park, MS AF Knauf, JA Pendergrass, SH Marrone, BL Strniste, GF MacInnes, MA Park, MS TI Multiple nuclear localization signals in XPG nuclease SO MUTATION RESEARCH-DNA REPAIR LA English DT Article DE Xeroderma pigmentosum G; nucleotide excision repair; nuclear localization signal ID B TRANSCRIPTION FACTOR; SACCHAROMYCES-CEREVISIAE; SUBCELLULAR-LOCALIZATION; EXCISION-REPAIR; DNA-BINDING; KAPPA-B; LARGE-T; PROTEINS; DOMAINS; COMPLEMENTATION AB We report here evidence for the mechanism of nuclear localization of XPG nuclease in human cells, Several candidate nuclear localization signal (NLS) peptides have been proposed for XPG protein. We have identified XPG peptides containing functional NLS and a potential nuclear retention signal (NRS) using in situ immune-fluorescence localization of transiently expressed beta-galactosidase fusion proteins. Two XPG regions with putative NLS [amino acid (AA) coordinates: NLS-B (AA 1057-1074) and NLS-C (AA 1171-1185)] were each shown to independently localize the beta-gal extensively (> 80%) to the nucleus of HeLa cells. The C-terminus peptide containing NLS-C, all NLS conserved evolutionarily between yeasts and humans, also directed sub-localization of beta-galactosidase to intranuclear foci reminiscent of native XPG protein, as well as to peri-nucleolar regions. Peptides in the putative XPG 'NLS domain' (AA similar to 1051-1185) apparently function in concert for nuclear localization and also for retention of XPG in nuclear matrix-associated foci. Evidence presented elsewhere (Park et al., 1995) indicates that the peptide containing NLS-C (AA 1146-1185) also regulates the dynamic localization of XPG in the nucleus following UV-irradiation. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. NR 36 TC 21 Z9 21 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8777 J9 MUTAT RES-DNA REPAIR JI Mutat. Res.-DNA Repair PD MAY 15 PY 1996 VL 363 IS 1 BP 67 EP 75 DI 10.1016/0921-8777(95)00062-3 PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology SC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology GA UK437 UT WOS:A1996UK43700007 PM 8632779 ER PT J AU Lobrich, M Rydberg, B Cooper, PK AF Lobrich, M Rydberg, B Cooper, PK TI Random-breakage mapping method applied to human DNA sequences SO NUCLEIC ACIDS RESEARCH LA English DT Article ID FIELD GEL-ELECTROPHORESIS; HUMAN CHROMOSOME-21; LONG ARM; RESTRICTION MAP; CLONES; GENE; RADIATION; YEAST; MODEL; HYBRIDIZATION AB The random-breakage mapping method [Game et al, (1990) Nucleic Acids Res., 18, 4453-4461] was applied to DNA sequences in human fibroblasts, The methodology involves Nod restriction endonuclease digestion of DNA from irradiated cells, followed by pulsed-field gel electrophoresis, Southern blotting and hybridization with DNA probes recognizing the single copy sequences of interest. The Southern blots show a band for the unbroken restriction fragments and a smear below this band due to radiation induced random breaks, This smear pattern contains two discontinuities in intensity at positions that correspond to the distance of the hybridization site to each end of the restriction fragment, By analyzing the positions of those discontinuities we confirmed the previously mapped position of the probe DXS1327 within a Nod fragment on the X chromosome, thus demonstrating the validity of the technique, We were also able to position the probes D21S1 and D21S15 with respect to the ends of their corresponding Nod fragments on chromosome 21, A third chromosome 21 probe, D21S11, has previously been reported to be close to D21S1, although an uncertainty about a second possible location existed, Since both probes D21S1 and D21S11 hybridized to a single Nod fragment and yielded a similar smear pattern, this uncertainty is removed by the random-breakage mapping method. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 37 TC 4 Z9 4 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 15 PY 1996 VL 24 IS 10 BP 1802 EP 1808 DI 10.1093/nar/24.10.1802 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UN986 UT WOS:A1996UN98600003 PM 8657558 ER PT J AU James, DFV Agarwal, GS AF James, DFV Agarwal, GS TI The generalized Fresnel transform and its application to optics SO OPTICS COMMUNICATIONS LA English DT Article ID FRACTIONAL FOURIER-TRANSFORMS; WIGNER DISTRIBUTION FUNCTION; SYSTEMS AB We consider the mathematical properties of a class of linear transforms, which we call the generalized Fresnel transforms, and which have wide applications to several areas of optics. Well-known transforms, such as the fractional Fourier transform and the Fresnel transform, can be seen to be special cases of this general transform. By use of an analogy with a quantum harmonic oscillator, we derive mathematical expressions for functions which remain invariant under such transforms, a result which has important applications in the theory of laser resonator modes. C1 PHYS RES LAB,AHMEDABAD 380009,GUJARAT,INDIA. RP James, DFV (reprint author), LOS ALAMOS NATL LAB,THEORET DIV T4,MAIL STOP K-723,LOS ALAMOS,NM 87545, USA. RI James, Daniel/B-9805-2009 OI James, Daniel/0000-0003-3981-4602 NR 30 TC 113 Z9 118 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD MAY 15 PY 1996 VL 126 IS 4-6 BP 207 EP 212 DI 10.1016/0030-4018(95)00708-3 PG 6 WC Optics SC Optics GA UN699 UT WOS:A1996UN69900005 ER PT J AU Lawrence, JM Graf, T Hundley, MF Mandrus, D Thompson, JD Lacerda, A Torikachvili, MS Sarrao, JL Fisk, Z AF Lawrence, JM Graf, T Hundley, MF Mandrus, D Thompson, JD Lacerda, A Torikachvili, MS Sarrao, JL Fisk, Z TI Kondo hole behavior in Ce0.97La0.03Pd3 SO PHYSICAL REVIEW B LA English DT Article ID CEPD3; MODEL AB We present results for the resistivity, the magnetoresistance, and the specific heat of Ce0.97La0.03Pd3 and CePd3. The impurity contributions to these measurements follow the :predictions of the single-impurity Kondo model for a Kondo temperature T-L approximate to 65 K, assuming that the impurity behaves as a crystal-field split (Gamma(7)) doubler. Assuming a J=5/2 impurity, the value of T-L needed to fit these experiments varies from 65 to 125 K. The contribution to the susceptibility may be too small to be explained by the model. These results address whether the nonmagnetic impurity behaves asa Kondo hole. C1 NATL HIGH MAGNET FIELD LAB,PULSE FACIL,LOS ALAMOS,NM 87545. FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306. UNIV CALIF IRVINE,DEPT PHYS & ASTRON,IRVINE,CA 92717. UNIV AUTONOMA MADRID,DEPT FIS,MADRID,SPAIN. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. SAN DIEGO STATE UNIV,DEPT PHYS,SAN DIEGO,CA 92182. RP Lawrence, JM (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. RI Mandrus, David/H-3090-2014 NR 14 TC 26 Z9 26 U1 2 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 12559 EP 12562 DI 10.1103/PhysRevB.53.12559 PG 4 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800007 ER PT J AU Corkill, JL Chelikowsky, JR AF Corkill, JL Chelikowsky, JR TI Adatom-adatom and adatom-surface interactions: Islands and chains of Cl on GaAs(110) SO PHYSICAL REVIEW B LA English DT Article AB Calculations are presented that quantify the adatom-surface and adatom-adatom interactions for Cl adsorption on GaAs(110). Expanding on a previous study of uniform Cl adatom islands, the present work investigates the surface relaxation energy in response to uniform Cl coverage. Compared to the bare (110) surface relaxation, a Cl adatom adsorbed near the surface Ga atom (the A site) causes relaxation back toward the zincblende atomic positions, which lowers the cell energy by about 1 eV, while a Cl adatom adsorbed on top of a surface As (the B site) has very little effect on the surface geometry. Additionally, the stability of linear chains of adatoms, similar to chains seen experimentally, and their effect on the surface GaAs geometry is investigated. We find an attractive Cl-Cl pair interaction, which is approximately 1.25 eV per Cl(A)-Cl(B) pair in the linear chain geometry. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV MINNESOTA,MINNESOTA SUPERCOMP INST,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455. RP Corkill, JL (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 10 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 12605 EP 12608 DI 10.1103/PhysRevB.53.12605 PG 4 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800019 ER PT J AU Dixon, D Kouwenhoven, LP McEuen, PL Nagamune, Y Motohisa, J Sakaki, H AF Dixon, D Kouwenhoven, LP McEuen, PL Nagamune, Y Motohisa, J Sakaki, H TI Influence of energy level alignment on tunneling between coupled quantum dots SO PHYSICAL REVIEW B LA English DT Article ID TRANSPORT AB We have measured the nonlinear transport properties of two GaAs/AlxGa1-xAs quantum dots connected in series. At high source-drain bias the Coulomb oscillations develop a sharp overstructure. The behavior of this overstructure is studied as a function of the electrostatic potentials of the dots. The structure is shown to arise from the modulation of interdot tunneling that occurs as the quantum levels in the two dots are aligned and dealigned. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV TOKYO,ADV SCI & TECHNOL RES CTR,MEGURO KU,TOKYO 153,JAPAN. RP Dixon, D (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,MAIL STOP 2-200,BERKELEY,CA 94720, USA. RI Motohisa, Junichi/D-6174-2012 NR 21 TC 37 Z9 37 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 12625 EP 12628 DI 10.1103/PhysRevB.53.12625 PG 4 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800024 ER PT J AU Carpinelli, JM Weitering, HH AF Carpinelli, JM Weitering, HH TI Low-temperature reconstruction pathway to the Si(111)(root 3x root 3)R30 degrees-Ag interface SO PHYSICAL REVIEW B LA English DT Article ID (ROOT(3)X-ROOT(3)R30-DEGREES AG/SI(111) SURFACE; SCANNING TUNNELING MICROSCOPE; ELECTRONIC-STRUCTURE; 1ST-PRINCIPLES CALCULATIONS; SI(111) SURFACE AB Using the spectroscopic capabilities of a scanning tunneling microscope, we identified and investigated a low-temperature reconstruction pathway for forming Si(111)(root 3 x root 3)R30 degrees-Ag from the Si(111)3 x 1-Ag interface. A metastable intermediate phase consisting of one-dimensional atom chains atop the Si(111)3 x 1-Ag reconstruction stabilizes locally. The density of states at the chains indicates a Ag-Si bonding configuration similar to that of the (root 3 x root 3)R30 degrees reconstruction. We propose a mechanism for the (3 x 1) to (root 3 x root 3)R30 degrees phase transformation at low temperature. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP Carpinelli, JM (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 26 TC 19 Z9 19 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 12651 EP 12654 DI 10.1103/PhysRevB.53.12651 PG 4 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800031 ER PT J AU Voter, AF Kress, JD Silver, RN AF Voter, AF Kress, JD Silver, RN TI Linear-scaling tight binding from a truncated-moment approach SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE CALCULATIONS; SYSTEM-SIZE; DENSITY-MATRIX; SILICON; MODEL AB We present an approximation to the total-energy light-binding (TR) method based on use of the kernel polynomial method within a truncated subspace. Chebyshev polynomial moments of the Hamiltonian matrix are generated in a stable and efficient manner through recursive matrix-vector multiples. To compute the energy, either the electronic density of states (DOS) or the zero-temperature Fermi function is smeared by convolution with the kernel polynomial, with Jackson damping to minimize Gibbs oscillations while maintaining the positivity of the DOS. These are shown to give approximate lower and upper bounds, respectively, on the exact TB energy, and are averaged to obtain an improved energy estimate. The scaling of the computational work is made linear in the number of atoms by truncating the moment computation at a certain range about each atom. Energy derivatives necessary for molecular dynamics are obtained via a matrix-polynomial derivative relation. The method converges to exact TB as the number of moments and the truncation range are increased. We demonstrate the convergence properties and viability of the method for materials simulations in an examination of defects in silicon. We also discuss the relative importance of truncation range versus number of moments. RP Voter, AF (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Voter, Arthur/0000-0001-9788-7194 NR 28 TC 72 Z9 72 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 12733 EP 12741 DI 10.1103/PhysRevB.53.12733 PG 9 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800041 ER PT J AU Morelli, DT Canfield, PC Drymiotis, P AF Morelli, DT Canfield, PC Drymiotis, P TI Low-temperature transport properties of NdBiPt SO PHYSICAL REVIEW B LA English DT Article ID FERMI LEVEL; GAAS; MAGNETOTRANSPORT; MAGNETISM; ELECTRON; GAP AB NdBiPt is a member of a new class of ternary intermetallic semiconductors and semimetals. These materials are covalently bonded crystals with band gaps expected to be in the range of 0-1 eV. Longitudinal resistivity, Hall resistivity, and thermoelectric power measurements reveal that in NdBiPt the ''gap'' is an overlap that gives rise to a semimetallic behavior exhibiting high hole and electron mobilities. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP Morelli, DT (reprint author), GM CORP,DEPT PHYS,CTR RES & DEV,WARREN,MI 48090, USA. RI Canfield, Paul/H-2698-2014 NR 24 TC 11 Z9 11 U1 2 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 12896 EP 12901 DI 10.1103/PhysRevB.53.12896 PG 6 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800059 ER PT J AU Boettger, JC AF Boettger, JC TI Persistent quantum-size effect in aluminum films up to twelve atoms thick SO PHYSICAL REVIEW B LA English DT Article ID METAL-FILMS; ELECTRON-DENSITY; WORK FUNCTION; AL(111); NA AB Total energies and work functions have been calculated for unrelaxed, free-standing Al(111) films, 1-12 layers thick, using the all-electron, full-potential linear combination of Gaussian-type orbitals-fitting-function technique. The work function exhibits a significant quantum-size effect (at least 0.1 eV) over the entire range of thickness considered. This result contradicts an old prediction that the work function of an Al(111) N-layer film will converge to within a few hundredths of an eV by N=6. The present result, which is consistent with earlier jellium calculations, demonstrates the risk of mistaking an accidental coincidence of work functions for two films, differing in thickness by one layer,for a true convergence with respect to thickness. The implications for thin-film calculations of surface properties are discussed. A linear fit to the film binding energy vs thickness is used to extract the Al(111) surface energy (0.45 eV) and the binding energy of bulk Al (4.06 eV). RP Boettger, JC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 23 TC 61 Z9 61 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 19 BP 13133 EP 13137 DI 10.1103/PhysRevB.53.13133 PG 5 WC Physics, Condensed Matter SC Physics GA UM478 UT WOS:A1996UM47800089 ER PT J AU Mews, A Kadavanich, AV Banin, U Alivisatos, AP AF Mews, A Kadavanich, AV Banin, U Alivisatos, AP TI Structural and spectroscopic investigations of CdS/HgS/CdS quantum-dot quantum wells SO PHYSICAL REVIEW B LA English DT Article ID NANOCRYSTALS; CLUSTERS; RAMAN AB Epitaxial growth in a CdS/HgS heterostructure of nanometer dimensions, prepared by methods of wet chemistry, is demonstrated. High-resolution transmission-electron microscopy is used to determine the shape and crystallinity of this system consisting of a quantum well in a quantum dot. The homogeneous absorption and fluorescence spectra are investigated by transient hole burning and fluorescence line-narrowing spectroscopy. The photophysical measurements provide evidence for charge-carrier localization within the HgS well. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP Mews, A (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 25 TC 229 Z9 237 U1 0 U2 18 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13242 EP 13245 PG 4 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900006 ER PT J AU Crespi, VH Benedict, LX Cohen, ML Louie, SG AF Crespi, VH Benedict, LX Cohen, ML Louie, SG TI Prediction of a pure-carbon planar covalent metal SO PHYSICAL REVIEW B LA English DT Article AB Carbon is well-known as an insulator, a semimetal, a molecular solid, and a one-dimensional semiconductor or low-density-of-states metal. We propose a pure-carbon planar structure composed of pentagons and heptagons that is metallic with a density of states at the Fermi level of similar to 0.1 state per eV per atom. This structure, planar carbon pentaheptite, is metastable with a total energy per carbon atom comparable to that of C-60. The structure can be rolled into tubes in a manner similar to graphite. Possible synthetic pathways are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP Crespi, VH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 9 TC 135 Z9 135 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13303 EP 13305 PG 3 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900022 ER PT J AU Bronold, FX Bishop, AR AF Bronold, FX Bishop, AR TI Nonlinear optics of conjugated polymers: A coupled exciton-phonon-gas approach SO PHYSICAL REVIEW B LA English DT Article ID RANDOM-PHASE-APPROXIMATION; INTERBAND QUANTUM KINETICS; BOSON-EXPANSION; SEMICONDUCTORS; POLYACETYLENE; SCATTERING; RESONANCE; COHERENT; LIGHT; WELLS AB Conjugated polymers are modeled as a system of one-dimensional pi electrons interacting via a short-range Coulomb interaction and coupled to an underlying harmonic lattice, i.e., as an extended Peierls-Hubbard model. A perturbative bosonization procedure is employed to map the original Hamiltonian onto an effective one describing a coupled, one-dimensional exciton-phonon gas (EPG), which should be especially useful in discussing nonlinear optics. This approach treats excitons as ideal Bose (quasi)particles subject to effective interactions, which in turn are the microscopic origin of the nonlinear optics response of the material. In particular, we derive effective interaction vertices for (i) exciton-exciton scattering, (ii) exciton-phonon coupling, and (iii) (nonlinear) exciton-light coupling within a semiclassical approximation. As an application of the EPG model to nonlinear optics of conjugated polymers, we study, in the collisionless regime, the steady state response of a coherently pumped EPG with respect to a spectrally broad test laser. The EPG approach discusses this particular four-wave-mixing experiment in terms of an externally driven, interacting two-component Bose gas. It explains optical Stark effects and inverse Raman scattering as due to composite excitations whose electronic and phononic degrees of freedom depend upon pump frequency and pump intensity. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. NR 59 TC 11 Z9 11 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13456 EP 13476 DI 10.1103/PhysRevB.53.13456 PG 21 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900040 ER PT J AU Greenham, NC Shinar, J Partee, J Lane, PA Amir, O Lu, F Friend, RH AF Greenham, NC Shinar, J Partee, J Lane, PA Amir, O Lu, F Friend, RH TI Optically detected magnetic resonance study of efficient two-layer conjugated polymer light-emitting diodes SO PHYSICAL REVIEW B LA English DT Article ID ALPHA-SI-H; POLY(PARAPHENYLENEVINYLENE); POLYACETYLENE; RECOMBINATION; VINYLENE); EXCITONS; POLARONS; FILMS AB We report the results of electroluminescence-detected magnetic resonance (ELDMR) measurements on efficient two-layer polymer light-emitting diodes (LED's) comprising a hole-transporting layer of poly(p-phenylenevinylene) (PPV) and an emissive layer of a cyano-substituted PPV derivative (CN-PPV). By comparing the ELDMR and conductivity-detected magnetic resonance (CDMR) results with photoluminescence-detected magnetic resonance on films of the polymers making up the LED, we are able to identify the components of the ELDMR and CDMR signals with processes occurring in either the PPV or the CN-PPV layers. We are, thus, able to establish the presence of triplet excitons in the CN-PPV layer. We also reveal the importance of bipolaron formation in the PPV layer, and discuss the assignment of the other ELDMR and CDMR features. C1 IOWA STATE UNIV,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV,DEPT PHYS & ASTRON,AMES,IA 50011. RP Greenham, NC (reprint author), UNIV CAMBRIDGE,CAVENDISH LAB,MADINGLEY RD,CAMBRIDGE CB3 0HE,ENGLAND. NR 35 TC 63 Z9 64 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13528 EP 13533 DI 10.1103/PhysRevB.53.13528 PG 6 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900048 ER PT J AU Hofmann, P Pohl, K Stumpf, R Plummer, EW AF Hofmann, P Pohl, K Stumpf, R Plummer, EW TI Geometric structure of Be(10(1)over-bar-0) SO PHYSICAL REVIEW B LA English DT Article ID MULTILAYER RELAXATION; ELECTRONIC-STRUCTURE; SURFACE RELAXATIONS; CO(1010) SURFACE; K(110) SURFACE; DENSITY; LEED; 1ST-PRINCIPLES; MG(0001); BE(0001) AB The structure of clean Be(<10(1)over bar 0>) was determined by low-energy electron-diffraction (LEED) I(V) analysis and the result compared to first-principles calculations. Both theory and experiment indicate that from the two possible terminations of the truncated bulk, the one with the shorter first-interlayer spacing is realized. The values for the multilayer relaxations obtained by LEED essentially coincide with the theoretical prediction. Although the magnitude of the first- to second-layer relaxation fits well into the trend observed on other simple metal surfaces, the driving force is probably different for beryllium. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP Hofmann, P (reprint author), UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. RI Hofmann, Philip/B-5938-2008 OI Hofmann, Philip/0000-0002-7367-5821 NR 54 TC 28 Z9 28 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13715 EP 13719 DI 10.1103/PhysRevB.53.13715 PG 5 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900072 ER PT J AU Feibelman, PJ AF Feibelman, PJ TI Relaxation of hcp(0001) surfaces: A chemical view SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; METAL-SURFACES; LATTICE-RELAXATION; 0001 SURFACE; BAND SYSTEM; DENSITY; POTENTIALS; BERYLLIUM; BE(0001); MG(0001) AB First-principles calculations predict 7.8% and 6.3% contractions of the outermost layer spacings of Ti(0001) and Zr(0001). Charge smoothing, slight at close-packed metal surfaces, cannot explain such large relaxations. Bond-order bond-length correlation is a more promising concept. Bonds to undercoordinated Ti or Zr should be unusually short, given the small ratio, similar to 0.7, of dimer bond length to nearest-neighbor distance for these elements. RP Feibelman, PJ (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 57 TC 97 Z9 98 U1 3 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13740 EP 13746 DI 10.1103/PhysRevB.53.13740 PG 7 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900076 ER PT J AU Chang, SL Wen, JM Thiel, PA Gunther, S Meyer, JA Behm, RJ AF Chang, SL Wen, JM Thiel, PA Gunther, S Meyer, JA Behm, RJ TI Initial stages of metal encapsulation during epitaxial growth studied by STM: Rh/Ag(100) SO PHYSICAL REVIEW B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; THIN-FILMS; CU(100); SURFACES; FE; AU; NUCLEATION; MAGNETISM; DYNAMICS; AG(111) AB We present results of a scanning tunneling microscope (STM) study of Rh/Ag(100) epitaxy, which shows how the surface rearranges toward the more stable encapsulated structure known to form at higher temperatures. At room temperature, Rh growth proceeds via two competing pathways: (i) thermally activated exchange with Ag surface atoms, which leads to increased coordination of the higher surface free-energy metal Rh by Ag atoms, and (ii) nucleation and growth of mixed Rh/Ag adislands. The Ag-Rh interaction also reduces the surface mobility of Ag, e.g., by local pinning of step edges, accompanied by complex step and surface erosion processes. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,GILMAN HALL,AMES,IA 50011. UNIV ULM,ABT OBERFLACHENCHEM & KATALYSE,D-89069 ULM,GERMANY. NR 26 TC 46 Z9 46 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13747 EP 13752 DI 10.1103/PhysRevB.53.13747 PG 6 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900077 ER PT J AU Yamamoto, M Chan, CT Ho, KM Kurahashi, M Naito, S AF Yamamoto, M Chan, CT Ho, KM Kurahashi, M Naito, S TI First-principles calculation of the longitudinal phonon in the surface-normal direction of a zirconium(0001) slab: Localization mode at the subsurface SO PHYSICAL REVIEW B LA English DT Article ID AL(110) SURFACE; TEMPERATURE; RESONANCES; DYNAMICS; TI AB The energies and amplitudes of the longitudinal vibrational mode in the surface-normal [0001] direction of the fully relaxed zirconium slab with a (0001) surface are calculated with force constants determined from first-principles total-energy and force calculations. A subsurface vibrational mode with frequency above the bulk continuum is found. We attribute the origin of this mode to the hardness of the force constant between the surface and the second layer. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS & ASTRON,AMES,IA 50011. HONG KONG UNIV SCI & TECHNOL,DEPT PHYS,KOWLOON,HONG KONG. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT ENGN,AMES,IA 50011. RP Yamamoto, M (reprint author), KYOTO UNIV,INST ATOM ENERGY,UJI,KYOTO 611,JAPAN. NR 26 TC 5 Z9 5 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1996 VL 53 IS 20 BP 13772 EP 13776 DI 10.1103/PhysRevB.53.13772 PG 5 WC Physics, Condensed Matter SC Physics GA UN909 UT WOS:A1996UN90900081 ER PT J AU Turner, MS Wang, Y AF Turner, MS Wang, Y TI Fast and accurate algorithm for computing tensor CBR anisotropy SO PHYSICAL REVIEW D LA English DT Article ID INFLATIONARY UNIVERSE; PERTURBATIONS; SCALE; COSMOLOGY; MODELS AB Inflation gives rise to a nearly scale-invariant spectrum of tensor perturbations (gravitational waves); their contribution to the cosmic background radiation (CBR) anisotropy depends upon the present cosmological parameters as well as inflationary parameters. The analysis of a sampling-variance-limited CBR map offers the most promising means of detecting tensor perturbations, but will require evaluation of the predicted multipole spectrum for a very large number of cosmological parameter sets. We present accurate polynomial formulas for computing the predicted variance of the multipole moments in terms of the cosmological parameters Omega(Lambda), Omega(o)h(2), Omega(B)h(2), N-v, and the power-law index n(T) Which are accurate to about 1% for l less than or equal to 50 and to better than 3% for 50], azimuth. Since the state is independent of the termination of the initial surface, and since iodine bonds primarily to the outermost element, the state must result from delocalization of the electron states in the overlayer, and is not related to bonding with the substrate. C1 ROYAL INST TECHNOL,DEPT PHYS,S-10044 STOCKHOLM,SWEDEN. LUND UNIV,INST PHYS,DEPT SYNCHROTRON RADIAT RES,S-22362 LUND,SWEDEN. CHALMERS UNIV TECHNOL,DEPT PHYS,S-41296 GOTHENBURG,SWEDEN. POLISH ACAD SCI,INST PHYS,PL-02668 WARSAW,POLAND. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Kowalski, Bogdan/A-2259-2015 OI Kowalski, Bogdan/0000-0003-4821-5265 NR 13 TC 6 Z9 6 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 15 PY 1996 VL 352 BP 387 EP 390 DI 10.1016/0039-6028(95)01166-8 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV254 UT WOS:A1996UV25400074 ER PT J AU Kendelewicz, T Liu, P Brown, GE Nelson, EJ Pianetta, P AF Kendelewicz, T Liu, P Brown, GE Nelson, EJ Pianetta, P TI Photoemission study of Na and Cs adsorption on MgO(100)1 x 1 SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 15th European Conference on Surface Science CY SEP 04-08, 1995 CL LILLE, FRANCE SP Conseil Reg Nord Pas Calais, Conseil Gen Nord, Ville Lille, Commiss European Communities, Delegat Reg Rech & Technol, Direct Rech & Technol, France Telecom, CNRS, Inst Super Electr Nord, Inst Electr & Microelectr Nord ID SURFACE AB Adsorption of Na and Cs on vacuum-cleaved MgO(100)1 X 1 surfaces has been studied with core and valence band photoemission spectroscopy. We conclude that both Na and Cs interact weakly with the surface except for small quantities of the initially adsorbed metals, Only trace amounts (less than or equal to 0.04 monolayers (ML)) of Cs could be found on the surface after doses that exposed the surface to many monolayers of Cs. Although larger amounts of Na (less than or equal to 1 ML) could be condensed on the surface, most of the Na is weakly physisorbed and easily desorbs at room temperature. However, a small fraction (0.02-0.045 ML) of both Na and Cs dosed onto MgO(100) appears to chemisorb on defect sites as indicated by an inability to desorb this fraction, The photoemission spectra for MgO(100) exposed to Na and Cs are unaffected by their presence except at high Na doses, where small changes are observed on the low kinetic energy side of the valence band and the high kinetic energy side of the Mg 2p feature. C1 STANFORD UNIV,DEPT GEOL & ENVIRONM SCI,STANFORD,CA 94305. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP Kendelewicz, T (reprint author), STANFORD UNIV,DEPT ELECT ENGN,STANFORD,CA 94305, USA. NR 6 TC 16 Z9 16 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 15 PY 1996 VL 352 BP 451 EP 456 DI 10.1016/0039-6028(95)01329-6 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV254 UT WOS:A1996UV25400087 ER PT J AU Bartos, I vanHove, MA Altman, MS AF Bartos, I vanHove, MA Altman, MS TI Cu(111) electron band structure and channeling by VLEED SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 15th European Conference on Surface Science CY SEP 04-08, 1995 CL LILLE, FRANCE SP Conseil Reg Nord Pas Calais, Conseil Gen Nord, Ville Lille, Commiss European Communities, Delegat Reg Rech & Technol, Direct Rech & Technol, France Telecom, CNRS, Inst Super Electr Nord, Inst Electr & Microelectr Nord DE copper; electron-solid interactions; scattering; diffraction; low energy electron diffraction (leed); low energy electron microscopy; low index single crystal surfaces; metallic surfaces AB Very-low-energy electron diffraction (VLEED) intensities from dean Cu(111) surface have been measured in derail in the energy range 15-35 eV by low energy electron microscope. Corresponding theoretical I-V curves are obtained in good agreement with experimental data when the anisotropy of the electron attenuation is taken into account. Coincidence of peaks in the I-V curves at normal incidence with two kinds of energy gaps of the electron band structure of the copper crystal (E(k parallel to=0)) is interpreted. The small width of the resonance peak in the I-V curve at normal incidence is explained in terms of electron surface channeling. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. HONG KONG UNIV SCI & TECHNOL,DEPT PHYS,KOWLOON,HONG KONG. RP Bartos, I (reprint author), ACAD SCI CZECH REPUBL,INST PHYS,PRAGUE,CZECH REPUBLIC. RI Van Hove, Michel/A-9862-2008; Bartos, Igor/G-5780-2014 OI Van Hove, Michel/0000-0002-8898-6921; NR 17 TC 19 Z9 19 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 15 PY 1996 VL 352 BP 660 EP 664 DI 10.1016/0039-6028(95)01204-4 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA UV254 UT WOS:A1996UV25400126 ER PT J AU Lee, YH Ogata, C Pflugrath, JW Levitt, DG Sarma, R Banaszak, LJ Pilkis, SJ AF Lee, YH Ogata, C Pflugrath, JW Levitt, DG Sarma, R Banaszak, LJ Pilkis, SJ TI Crystal structure of the rat liver fructose-2,6-bisphosphatase based on selenomethionine multiwavelength anomalous dispersion phases SO BIOCHEMISTRY LA English DT Article ID HEPATIC 6-PHOSPHOFRUCTO-2-KINASE FRUCTOSE-2,6-BISPHOSPHATASE; PHOSPHO GROUP; DOMAIN; BINDING; DIFFRACTION; MAPS AB The crystal structure of the recombinant fructose-2,6-bisphosphatase domain, which covers the residues between 251 and 440 of the rat liver bifunctional enzyme, 6-phosphofructo-2-kinase/fructose2,6-bisphosphatase, was determined by multiwavelength anomalous dispersion phasing and refined at 2.5 Angstrom resolution. The selenomethionine-substituted protein was induced in the methionine auxotroph, Escherichia coli DL41DE3, purified, and crystallized in a manner similar to that of the native protein. Phase information was calculated using the multiwavelength anomalous dispersion data collected at the X-ray wavelengths near the absorption edge of the K-shell alpha electrons of selenium. The fructose-2,6-bisphosphatase domain has a core alpha/beta structure which consists of six stacked beta-strands, four parallel and two antiparallel. The core beta-sheet is surrounded by nine alpha-helices. The catalytic site, as defined by a bound phosphate ion, is positioned near the C-terminal end of the beta-sheet and close to the N-terminal end of an alpha-helix. The active site pocket is funnel-shaped. The narrow opening of the funnel is wide enough for a water molecule to pass, The key catalytic residues, including His7, His141, and Glu76, are near each other at the active site and probably function as general acids and/or bases during a catalytic cycle. The inorganic phosphate molecule is bound to an anion trap formed by Arg6, His7, Arg56, and Hisl41. The core structure of the Fru-2,6-P(2)ase is similar to that of the yeast phosphoglycerate mutase and the rat prostatic acid phosphatase. However, the structure of one of the loops near the active site is completely different from the other family members, perhaps reflecting functional differences and the nanomolar range affinity of Fru-2,6-P(2)ase for its substrate. The imidazole rings of the two key catalytic residues, His7 and Hisl41, are not parallel as in the yeast phosphoglycerate mutase. The crystal structure is used to interpret the existing chemical data already available for the bisphosphatase domain. In addition, the crystal structure is compared with two other proteins that belong to the histidine phosphatase family. C1 UNIV MINNESOTA,DEPT BIOCHEM,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,DEPT PHYSIOL,MINNEAPOLIS,MN 55455. BROOKHAVEN NATL LAB,HOWARD HUGHES MED INST,UPTON,NY 11973. MOL STRUCT CORP,THE WOODLANDS,TX 77381. SUNY STONY BROOK,DEPT BIOCHEM,STONY BROOK,NY 11794. FU NIDDK NIH HHS [R37-DK38354] NR 29 TC 53 Z9 54 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 14 PY 1996 VL 35 IS 19 BP 6010 EP 6019 DI 10.1021/bi9600613 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UK926 UT WOS:A1996UK92600008 PM 8634242 ER PT J AU Cai, ZP Tinoco, I AF Cai, ZP Tinoco, I TI Solution structure of loop a from the hairpin ribozyme from tobacco ringspot virus satellite SO BIOCHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; RNA; NMR; SEQUENCES; SELECTION; CLEAVAGE; BINDING; H-1 AB The solution structure of loop A from the hairpin ribozyme found in the minus strand of tobacco ringspot virus satellite has been determined by NMR spectroscopy. The ribozyme consists of two internal loops flanked by short helices: loop A and helices I and II include the substrate and substrate binding site; loop B and helices III and IV are the catalytic domain. Loop A is a symmetric internal loop of eight nucleotides that contains the cleavage site. The 2-amino group of the guanine immediately 3' to the cleavage site is essential for catalysis. NMR results show that this guanine forms a sheared G . A base pair. The cytosine residue immediately 5' to the cleavage site forms an AH(+). C base pair with an adenine whose pK(a) is shifted to 6.2 to allow partial protonation near neutral pH. Although the residues flanking the cleavage site are stacked in an A-form pattern, the phosphodiester backbone next to the cleavage site on the 3' side is splayed apart. This places the following base-a uracil-in the expanded major groove, The conformational flexibility and the lack of steric hindrance of the uracil as well as the unoccupied Watson-Crick positions on the sheared G . A base pair can allow loop A to specifically interact with the catalytic domain (loop B) without drastically changing its own conformation. The three-dimensional structure of loop A provides explanations for previously published mutation and structural mapping results. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY NATL LAB,STRUCT BIOL DIV,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM 10840] NR 38 TC 177 Z9 180 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 14 PY 1996 VL 35 IS 19 BP 6026 EP 6036 DI 10.1021/bi952985g PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UK926 UT WOS:A1996UK92600010 PM 8634244 ER PT J AU Bullock, RM Song, JS Szalda, DJ AF Bullock, RM Song, JS Szalda, DJ TI Protonation of metal hydrides by strong acids. Formation of an equilibrium mixture of dihydride and dihydrogen complexes from protonation of Cp*Os(CO)(2)H. Structural characterization of [CpW(CO)(2)(PMe(3))(PMe(3))(H)(2)](+)OTf(-) SO ORGANOMETALLICS LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; NEUTRON-DIFFRACTION DATA; RAY CRYSTAL-STRUCTURE; M = RU; C-H...O; TRANSITION-METALS; COORDINATED DIHYDROGEN; POLYHYDRIDE COMPLEXES; LOW-TEMPERATURE; OXYGEN BASES AB Cp*Os(CO)(2)H is protonated by triflic acid (HOTf) in CD2Cl2 solution to give an equilibrium mixture (87:13) of the dihydride [Cp*Os(CO)(2)(H)(2)](+)OTf(-) and the dihydrogen complex [Cp*Os(CO)(2)(eta(2)-H-2)](+)OTf(-). The acidity of these protonated species is roughly comparable to HOTf, since only partial protonation was observed, e.g., 36% protonation with 1.2 equiv of HOTf. In the absence of acid, the T-1 of the hydride ligand of Cp*Os(CO)(2)H is 5.9 s at -80 degrees C. When all of the Cp*Os(CO)(2)H is protonated by excess HOTf, the T-1 (-80 degrees C) of the terminal hydride ligands of [Cp*Os(CO)(2)(H)(2)](+)OTf(-) is 2.8 s, while the T-1 of the dihydrogen ligand of [Cp*Os(CO)(2)(eta(2)-H-2)](+)OTf(-) is 19 ms (-80 degrees C). The observed T-1 values of the Os-H resonance of Cp*Os(CO)(2)H decreased significantly under conditions of partial protonation, indicating intermolecular proton transfer among [Cp*Os(CO)(2)(eta(2)-H-2)](+)OTf(-), [Cp*Os(CO)(2)(H)(2)](+)OTf(-), Cp*Os(CO)(2)H, and HOTf. IR spectra indicate that the two CO ligands of [Cp*Os(CO)(2)(H)(2)](+) (and hence the hydrides as well) are trans to each other in the four-legged piano stool geometry. Two resonances for HOTf are observed in the NMR spectra and are assigned as [HOTf](n) (hydrogen bonded to itself) and TfOH ... OTf(-) in which HOTf is hydrogen bonded to an OTf(-) counterion. [CpW(CO)(3)(H)(2)](+)OTf(-) and [Cp*W(CO)(3)(H)(2)](+)OTf(-) were formed by protonation of CpW(CO)(3)H and Cp*W(CO)(3)H. Protonation of the phosphine-substituted tungsten hydrides CpW(CO)(2)(PR(3))H (R = Me, Cy, Ph) by HOTf or [H(Et(2)O)(2)](+) BAr'(-)(4) (Ar' = 3,5-bis(trifluoromethyl)phenyl) gives dihydrides [CpW(CO)(2)(PR(3))(H)(2)](+) which were isolated and fully characterized. The structure of [CpW(CO)(2)(PMe(3))(H)(2)](+)OTf(-) was determined by single-crystal X-ray diffraction and reveals weak hydrogen bonds between one hydride on W and two of the fluorines on the triflate anion. C1 BARUCH COLL,DEPT NAT SCI,NEW YORK,NY 10010. RP Bullock, RM (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 83 TC 79 Z9 79 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAY 14 PY 1996 VL 15 IS 10 BP 2504 EP 2516 DI 10.1021/om950976y PG 13 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA UL321 UT WOS:A1996UL32100017 ER PT J AU Yershov, G Barsky, V Belgovskiy, A Kirillov, E Kreindlin, E Ivanov, I Parinov, S Guschin, D Drobishev, A Dubiley, S Mirzabekov, A AF Yershov, G Barsky, V Belgovskiy, A Kirillov, E Kreindlin, E Ivanov, I Parinov, S Guschin, D Drobishev, A Dubiley, S Mirzabekov, A TI DNA analysis and diagnostics on oligonucleotide microchips SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE sequencing by hybridization; hybridization pattern ID BETA-THALASSEMIA; HYBRIDIZATION; PROBES; MUTATIONS; SEQUENCE AB We present a further development in the technology of sequencing by hybridization to oligonucleotide microchips (SHOM) and its application to diagnostics for genetic diseases. A robot has been constructed to manufacture sequencing ''microchips.'' The microchip is an array of oligonucleotides immobilized into gel elements fixed on a glass plate. Hybridization of the microchip with fluorescently labeled DNA was monitored in real time simultaneously for all microchip elements with a two-wavelength fluorescent microscope equipped with a charge-coupled device camera. SHOM has been used to detect beta-thalassemia mutations in patients by hybridizing PCR-amplified DNA with the microchips. A contiguous stacking hybridization technique has been applied for the detection of mutations; it can simplify medical diagnostics and enhance its reliability. The use of multicolor monitoring of contiguous stacking hybridization is suggested for large-scale diagnostics and gene polymorphism studies. Other applications of the SHOM technology are discussed. C1 ARGONNE NATL LAB,CTR MECH BIOL & BIOTECHNOL,ARGONNE,IL 60439. VA ENGELHARDT MOLEC BIOL INST,JOINT HUMAN GENOME PROGRAM,MOSCOW 117984,RUSSIA. NR 31 TC 325 Z9 348 U1 4 U2 22 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD MAY 14 PY 1996 VL 93 IS 10 BP 4913 EP 4918 DI 10.1073/pnas.93.10.4913 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UL255 UT WOS:A1996UL25500072 PM 8643503 ER PT J AU Chen, GD Smith, M Lin, JY Jiang, HX Wei, SH Khan, MA Sun, CJ AF Chen, GD Smith, M Lin, JY Jiang, HX Wei, SH Khan, MA Sun, CJ TI Fundamental optical transitions in GaN SO APPLIED PHYSICS LETTERS LA English DT Article AB A coherent picture for the band structure near the Gamma point and the associated fundamental optical transitions in wurtzite (WZ) GaN, including the electron and hole effective masses and the binding energies of the free excitons associated with different valence bands, has been derived from time-resolved photoluminescence measurements and a theoretical calculation based on the local density approximation. We also determine the radiative recombination lifetimes of the free excitons and neutral impurity (donor and acceptor) bound excitons in WZ GaN and compare ratios of the radiative lifetimes with calculated values of the ratios obtained with existing theories of free and bound excitons. (C) 1996 American Institute of Physics. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. APA OPT INC,BLAINE,MN 55449. XIAN JIAOTONG UNIV,DEPT APPL PHYS,XIAN,PEOPLES R CHINA. RP Chen, GD (reprint author), KANSAS STATE UNIV,DEPT PHYS,CARDWELL HALL,MANHATTAN,KS 66506, USA. RI Chen, Guangde/D-4373-2011; Lin, Jingyu/A-7276-2011; Jiang, Hongxing/F-3635-2011; chen, guangde/I-4260-2014 OI Lin, Jingyu/0000-0003-1705-2635; Jiang, Hongxing/0000-0001-9892-4292; NR 16 TC 158 Z9 160 U1 2 U2 37 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1996 VL 68 IS 20 BP 2784 EP 2786 DI 10.1063/1.116606 PG 3 WC Physics, Applied SC Physics GA UK569 UT WOS:A1996UK56900004 ER PT J AU Jimenez, I Jankowski, A Terminello, LJ Carlisle, JA Sutherland, DGJ Doll, GL Mantese, JV Tong, WM Shuh, DK Himpsel, FJ AF Jimenez, I Jankowski, A Terminello, LJ Carlisle, JA Sutherland, DGJ Doll, GL Mantese, JV Tong, WM Shuh, DK Himpsel, FJ TI Near-edge x-ray absorption fine structure study of bonding modifications in BN thin films by ion implantation SO APPLIED PHYSICS LETTERS LA English DT Article ID BORON-NITRIDE; SYNCHROTRON-RADIATION; DEPOSITION AB Near-edge x-ray absorption fine structure (NEXAFS) has been used to study the defect content and the bonding modifications induced in BN thin films by ion implantation. The initial films were hexagonal-like BN grown on Si(100) by pulsed laser deposition. Subsequent ion implantation with N-2(+) at 180 keV induces the formation of a significant proportion of sp(2) bonding (cubic-like), and the formation of nitrogen void defects in the remaining sp(2) BN. These modifications in the bonding of a film lacking long range order can only be distinguished with a local order technique like NEXAFS. (C) 1995 American Institute of Physics. C1 GM RES LAB,WARREN,MI 48090. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. RP Jimenez, I (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. RI Jimenez, Ignacio/F-7422-2010; Tong, William/D-2564-2010 OI Jimenez, Ignacio/0000-0001-5605-3185; NR 16 TC 71 Z9 72 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1996 VL 68 IS 20 BP 2816 EP 2818 PG 3 WC Physics, Applied SC Physics GA UK569 UT WOS:A1996UK56900015 ER PT J AU Froyen, S Zunger, A Mascarenhas, A AF Froyen, S Zunger, A Mascarenhas, A TI Polarization fields and band offsets in GaInP/GaAs and ordered/disordered GaInP superlattices SO APPLIED PHYSICS LETTERS LA English DT Article ID OPTICAL-PROPERTIES; LAYER SUPERLATTICES; PHOTOLUMINESCENCE; SEMICONDUCTORS; GA0.5IN0.5P; ALLOYS; GROWTH AB Using the first-principles pseudopotential method we have calculated band offsets between ordered and disordered Ga0.5In0.5P and between ordered GaInP2 and GaAs. We find valence band offsets of 0.10 and 0.27 eV for the two interfaces with the valence band maximum on ordered GaInP2 and GaAs, respectively. Using experimental band gaps these offsets indicate that the ordered/disordered Ga0.5In0.5P interface has type I band alignment and that the ordered GaInP2/GaAs interface has type II alignment. Assuming transitivity of the band offsets, these results suggest a type I alignment between disordered Ga0.5In0.5P and GaAs and a transition from type I to type Il as the GaInP side becomes more ordered. Our calculations also show that ordered GaInP2 has a strong macroscopic electric polarization. This polarization will generate electric fields in inhomogeneous samples, strongly affecting the electronic properties of the material. (C) 1996 American Institute of Physics. RP Froyen, S (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 25 TC 111 Z9 111 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1996 VL 68 IS 20 BP 2852 EP 2854 DI 10.1063/1.116346 PG 3 WC Physics, Applied SC Physics GA UK569 UT WOS:A1996UK56900027 ER PT J AU Espy, MA Dehnhard, D Edwards, CM Palarczyk, M Langenbrunner, JL Davis, B Burleson, GR Blanchard, S Gibbs, WR Lail, B Nelson, B Park, BK Zhao, Q Cummings, WJ Delheij, PPJ Jennings, BK Henderson, R Hausser, O Thiessen, D Brash, E Jones, MK Larson, B Brinkmoller, B Maeda, K Morris, CL ODonnell, JM Penttila, S Swenson, D Tupa, D Bennhold, C Kamalov, SS AF Espy, MA Dehnhard, D Edwards, CM Palarczyk, M Langenbrunner, JL Davis, B Burleson, GR Blanchard, S Gibbs, WR Lail, B Nelson, B Park, BK Zhao, Q Cummings, WJ Delheij, PPJ Jennings, BK Henderson, R Hausser, O Thiessen, D Brash, E Jones, MK Larson, B Brinkmoller, B Maeda, K Morris, CL ODonnell, JM Penttila, S Swenson, D Tupa, D Bennhold, C Kamalov, SS TI Asymmetries for elastic scattering of pi(+) from polarized He-3 and the Delta-neutron spin-spin interaction SO PHYSICAL REVIEW LETTERS LA English DT Article ID PION-SCATTERING; TRINUCLEON; RESONANCE; FORCES; REGION AB Asymmetries for pi(+) elastic scattering from polarized He-3 were measured across the Delta(1232) pi-nucleon resonance region at incident energies T-pi = 142, 180, and 256 MeV. Large discrepancies were found between the data and calculations that use the multiple scattering formalism and Faddeev wave functions. Inclusion of a Delta-neutron spin-spin interaction term in the calculations gives a greatly improved representation of the data. C1 NEW MEXICO STATE UNIV, DEPT PHYS, LAS CRUCES, NM 88003 USA. TRIUMF, VANCOUVER, BC V6T 2A3, CANADA. RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA. OHIO UNIV, DEPT PHYS & ASTRON, ATHENS, OH 45701 USA. UNIV KARLSRUHE, INST PHYS, KARLSRUHE, GERMANY. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. GEORGE WASHINGTON UNIV, DEPT PHYS, CTR NUCL STUDIES, WASHINGTON, DC 20052 USA. JOINT INST NUCL RES DUBNA, MOSCOW, RUSSIA. RP Espy, MA (reprint author), UNIV MINNESOTA, SCH PHYS & ASTRON, MINNEAPOLIS, MN 55455 USA. RI Lail, Brian/L-6382-2015 OI Lail, Brian/0000-0001-6039-3385 NR 28 TC 9 Z9 9 U1 0 U2 2 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 MAY 13 PY 1996 VL 76 IS 20 BP 3667 EP 3670 DI 10.1103/PhysRevLett.76.3667 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000002 ER PT J AU Blumenfeld, R AF Blumenfeld, R TI Nonequilibrium brittle fracture propagation: Steady state, oscillations, and intermittency SO PHYSICAL REVIEW LETTERS LA English DT Article ID DYNAMIC FRACTURE; INSTABILITY; ARREST AB A minimal model is constructed for two-dimensional fracture propagation. The heterogeneous process zone is presumed to suppress stress relaxation rate, leading to non-quasistatic behavior. Using the Yoffe solution, I construct and solve a dynamical equation for the tip stress. I discuss a generic tip-velocity response to local stress and find that noise-free propagation is either at steady state or oscillatory, depending only on one material parameter. Noise gives rise to intermittency and quasiperiodicity. The theory explains the velocity oscillations and the complicated behavior seen in polymeric and amorphous brittle materials. I suggest experimental verifications and new connections between velocity measurements and material properties. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 30 TC 8 Z9 8 U1 2 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 MAY 13 PY 1996 VL 76 IS 20 BP 3703 EP 3706 DI 10.1103/PhysRevLett.76.3703 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000011 ER PT J AU Cao, NZ Chen, SY She, ZS AF Cao, NZ Chen, SY She, ZS TI Scalings and relative scalings in the Navier-Stokes turbulence SO PHYSICAL REVIEW LETTERS LA English DT Article ID HOMOGENEOUS TURBULENCE; VELOCITY INCREMENTS; LYAPUNOV SPECTRUM; DISSIPATION; MODEL AB High-resolution direct numerical simulations of 3D Navier-Stokes turbulence with normal viscosity and hyperviscosity are carried out. It is found that the inertial-range statistics, both the scalings and the probability density functions, are independent of the dissipation mechanism, while the near-dissipation-range fluctuations show significant structural differences. Nevertheless, the relative scalings expressing the dependence of the moments at different orders are universal, and show unambiguous departure from the Kolmogorov 1941 description, including the 2/3 law for the kinetic energy. Implications for numerical modeling of turbulence are discussed. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV ARIZONA,DEPT MATH,TUCSON,AZ 85721. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90095. RP Cao, NZ (reprint author), IBM CORP,DIV RES,TJ WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. RI Chen, Shiyi/A-3234-2010; 佘, 振苏/C-1447-2010; She, Zhen-Su/H-9722-2014 NR 28 TC 58 Z9 63 U1 3 U2 8 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 MAY 13 PY 1996 VL 76 IS 20 BP 3711 EP 3714 DI 10.1103/PhysRevLett.76.3711 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000013 ER PT J AU Stupakov, GV Chen, P AF Stupakov, GV Chen, P TI Plasma suppression of beam-beam interaction in circular colliders SO PHYSICAL REVIEW LETTERS LA English DT Article AB A possibility to suppress the beam-beam interaction in a circular collider by means of introducing a plasma at the interaction point of the colliding beams is considered. It is shown that for TeV proton and muon colliders, the overdense plasma can easily suppress the beam-beam tune-shift parameter several times without degrading the beam lifetimes. RP Stupakov, GV (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 14 TC 7 Z9 7 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 MAY 13 PY 1996 VL 76 IS 20 BP 3715 EP 3718 DI 10.1103/PhysRevLett.76.3715 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000014 ER PT J AU Qiu, X Batchelor, K BenZvi, I Wang, XJ AF Qiu, X Batchelor, K BenZvi, I Wang, XJ TI Demonstration of emittance compensation through the measurement of the slice emittance of a 10-ps electron bunch SO PHYSICAL REVIEW LETTERS LA English DT Article ID ACCELERATOR AB The beam matrix of a picosecond long slice of an electron bunch was measured. A short slice is selected out of an energy chirped beam by a slit in a dispersive region. The emittance is measured using the quadrupole scan technique. We observe the process of emittance compensation of the beam by repeating the measurement for various values of the compensating solenoid and for several slices. RP Qiu, X (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE DEPT,UPTON,NY 11973, USA. NR 6 TC 47 Z9 47 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 MAY 13 PY 1996 VL 76 IS 20 BP 3723 EP 3726 DI 10.1103/PhysRevLett.76.3723 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000016 ER PT J AU Labaune, C Baldis, HA Schifano, E Bauer, BS Michard, A Renard, N Seka, W Moody, JD Estabrook, KG AF Labaune, C Baldis, HA Schifano, E Bauer, BS Michard, A Renard, N Seka, W Moody, JD Estabrook, KG TI Location of ion-acoustic waves from back and side stimulated brillouin scattering SO PHYSICAL REVIEW LETTERS LA English DT Article ID LASER-PRODUCED PLASMAS; MU-M LASER; LIGHT; WAVELENGTH AB Direct observation of the location of ion-acoustic waves (IAWs) explains for the first time the stimulated Brillouin scattering (SBS) spectra in backward and side directions. The regions of SBS activity are limited and smaller than the scale length of the plasma. front part of the plasma, resulting in blue Doppler shift of the scattered electromagnetic wave, and the distance from the summit changes with the SBS angle. C1 UNIV ROCHESTER,LASER ENERGET LAB,ROCHESTER,NY 14627. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP Labaune, C (reprint author), ECOLE POLYTECH,LAB UTILISAT LASERS INTENSES,F-91128 PALAISEAU,FRANCE. NR 26 TC 27 Z9 27 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 MAY 13 PY 1996 VL 76 IS 20 BP 3727 EP 3730 DI 10.1103/PhysRevLett.76.3727 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000017 ER PT J AU Argyriou, DN Mitchell, JF Potter, CD Hinks, DG Jorgensen, JD Bader, SD AF Argyriou, DN Mitchell, JF Potter, CD Hinks, DG Jorgensen, JD Bader, SD TI Lattice effects and magnetic order in the canted ferromagnetic insulator La(0.87)5Sr(0.125)MnO(3+delta) SO PHYSICAL REVIEW LETTERS LA English DT Article AB The structural, magnetic, and transport behavior of orthorhombic, insulating La0.875Sr0.125MnO3+delta were studied as a function of temperature from 20 to 300 g. Upon cooling from room temperature, we observe the rapid development of a large breathing-mode distortion coincident with large positive and negative thermal expansions for the c and b axes. respectively. The onset of canted ferromagnetic ordering at 220 K is correlated with the relaxation of this distortion, which reaches values similar to those at room temperature when the magnetic ordering saturates. We observe no first-order-type discontinuity in the volume at the ferromagnetic transition. These results demonstrate a strong coupling between magnetic ordering and crystal structure even though there is no metal-insulator transition associated with the magnetic transition. RP Argyriou, DN (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 17 TC 102 Z9 102 U1 0 U2 8 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 MAY 13 PY 1996 VL 76 IS 20 BP 3826 EP 3829 DI 10.1103/PhysRevLett.76.3826 PG 4 WC Physics, Multidisciplinary SC Physics GA UK560 UT WOS:A1996UK56000042 ER PT J AU Lee, Y Perkins, LT Gough, RA Hoffmann, M Kunkel, WB Leung, KN Sarstedt, M Vujic, J Weber, M Williams, MD AF Lee, Y Perkins, LT Gough, RA Hoffmann, M Kunkel, WB Leung, KN Sarstedt, M Vujic, J Weber, M Williams, MD TI Production of low energy spread ion beams with multicusp sources SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The use of multicusp sources to generate ion beams with narrow energy spread has been investigated. It is found that the presence of a magnetic filter can reduce the longitudinal energy spread significantly. This is achieved by creating a uniform plasma potential distribution in the discharge chamber region, eliminating ion production in the extraction chamber and in the sheath of the exit aperture and by minimizing the probability of charge exchange processes in the extraction chamber. An energy spread as low as 1 eV has been measured. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 6 TC 23 Z9 23 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 MAY 11 PY 1996 VL 374 IS 1 BP 1 EP 6 DI 10.1016/0168-9002(96)00095-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA UP826 UT WOS:A1996UP82600001 ER PT J AU Lehnert, MD Heckman, TM AF Lehnert, MD Heckman, TM TI Ionized gas in the halos of edge-on starburst galaxies: Evidence for supernova-driven superwinds SO ASTROPHYSICAL JOURNAL LA English DT Article DE galaxies, halos; galaxies, ISM; galaxies, starburst; infrared, galaxies; shock waves; supernovae, general ID TURBULENT MIXING LAYERS; FAR-INFRARED GALAXIES; INTERSTELLAR-MEDIUM; IRAS OBSERVATIONS; NGC 253; SAMPLE; M82; EXPLOSIONS; NUCLEUS; SPECTRA AB Supernova-driven galactic winds (''superwinds'') have been invoked to explain many aspects of galaxy formation and evolution. Such winds should arise when the supernova rate is high enough to create a cavity of very hot shock-heated gas within a galaxy. This gas can then expand outward as a high-speed wind that can accelerate and heat ambient interstellar or circum-galactic gas causing it to emit optical line radiation and/or thermal X-rays. Theory suggests that such winds should be common in starburst galaxies and that the nature of the winds should depend on the star formation rate and distribution. In order to systematize our observational understanding of superwinds (determine their incidence rate and the dependence of their properties on the star formation that drives them) and to make quantitative comparisons with the theory of superwinds, we have analyzed data from an optical spectroscopic and narrow-band imaging survey of an infrared flux-limited (S-60 mu m greater than or equal to 5.4 Jy) sample of about 50 IR-warm (S-60 mu m/S-100 mu m > 0.4), starburst galaxies whose stellar disks are viewed nearly edge-on (b/a greater than or equal to 2). This sample contains galaxies with infrared luminosities from x 10(10)-10(12) L. and allows us to determine the properties of superwinds over a wide range of star formation rates. We have found that extraplanar emission-line gas is a very common feature of these edge-on, IR-bright galaxies and the properties of the extended emission-line gas are qualitatively and quantitatively consistent with the superwind theory. We can summarize these properties as morphological, ionization, dynamical, and physical. 1. Morphological properties.-Extraplanar filamentary and shell-like emission-line morphologies on scales of hundreds of parsecs to 10 kpc are common, there is a general ''excess'' of line emission along the minor axis, the minor axis emission-line ''excess'' correlates with ''IR activity,'' and the minor axis emission-line ''excess'' also correlates with the relative compactness of the Ha emission. 2. Ionization properties.-line ratios become more ''shocklike'' (high ratios of [IN II] lambda 6583/H alpha, CS Ill lambda lambda 6716, 6731/H alpha, and [OI] lambda 6300/H alpha) at more extreme IR properties, the most ''shocklike'' line ratios occur far out along the minor axis, ''shocklike'' line ratios corresponds to broad emission lines, and the most extreme line ratios correspond to the most extreme IR properties, especially for the emission-line gas farthest out along the minor axis. 3. Dynamical properties.-Lines are broader along the minor axis than along the major axis, line widths correlate with the ''IR activity,'' line widths correlate with line ratios, line widths do not correlate with rotation speed, minor axis shear (a measure of the systematic velocity change along the minor axis) correlates with ''IR activity,'' minor axis shear correlates with axial ratio and implies that a face-on galaxy would have an outflow/inflow speed of 170(-80)(+150) km s(-1), and the starbursts show statistically blueward line profile asymmetries. 4. Physical properties.-Pressures in the nuclei of these galaxies are 3 orders of magnitude higher than the ambient pressure in the interstellar medium of our galaxy, and the pressure falls systematically with radius. While none of these results are in themselves proof of the superwind model, we believe that when the results are taken as a whole, the superwind hypothesis is very successful in explaining what we have observed. In addition, these results have implications for galaxy evolution and the nature of the intergalactic medium. Those galaxies with the best evidence for driving superwinds are those with large IR luminosities (L(IR) X 10(44) ergs s(-1)), large IR excesses (L(IR)/L(OPT) greater than or similar to 2), and warm far-IR colors (S-60 mu m/S-100 mu m greater than or similar to 0.5). Integrating over the local far-IR luminosity function for galaxies meeting the above criteria, multiplying by the age of the universe, and then dividing by the local space density of galaxies implies that superwinds have carried out approximate to 5 x 10(8) M. in metals and 10(59) ergs in kinetic plus thermal energy per average (Schecter L*) galaxy over the history of the universe. We note that these two quantities are approximately equal to the mass of metals contained inside an average galaxy and the gravitational binding energy of an average galaxy, respectively. Even with the conservative assumptions of this calculation (we have neglected that star formation rates were presumably higher in the early universe), it is obvious that superwinds may have a major impact on the evolution of indiviual galaxies and the intergalactic medium by injecting mass, metals, and kinetic energy into the galactic halo and potentially the intergalactic medium. C1 LAWRENCE LIVERMORE NATL LAB, INST GEOPHYS & PLANETARY PHYS, LIVERMORE, CA 94550 USA. RP Lehnert, MD (reprint author), JOHNS HOPKINS UNIV, HENRY A ROWLAND DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA. NR 34 TC 228 Z9 228 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 10 PY 1996 VL 462 IS 2 BP 651 EP + DI 10.1086/177180 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA UH187 UT WOS:A1996UH18700008 ER PT J AU Scully, ST Casse, M Olive, KA Schramm, DN Truran, J VangioniFlam, E AF Scully, ST Casse, M Olive, KA Schramm, DN Truran, J VangioniFlam, E TI The local abundance of He-3: A confrontation between theory and observation SO ASTROPHYSICAL JOURNAL LA English DT Article DE Galaxy, abundances; Galaxy, evolution; nuclear reactions, nucleosynthesis, abundances; Sun, abundances ID BIMODAL STAR FORMATION; INTER-STELLAR MEDIUM; CHEMICAL EVOLUTION; INTERSTELLAR-MEDIUM; GALACTIC DISK; NUCLEOSYNTHESIS; MODELS; DEUTERIUM; GALAXIES; METEORITES AB Determinations of the He-3 concentrations in Galactic matter serve to impose interesting and important constraints both on cosmological models and on models of Galactic chemical evolution. At present, observations of He-3 in the solar system and in the interstellar medium today suggest that the He-3 abundance has not increased significantly over the history of the Galaxy, while theoretical models of Galactic chemical evolution (utilizing current nucleosynthesis yields from stellar evolution and supernova models) predict a rather substantial increase in He-3. We consider the possibility that the solar( )3He abundance may have been affected by stellar processing in the solar neighborhood prior to the formation of the solar system. Such a discrepancy between solar abundances and average Galactic abundances by as much as a factor of 2 may be evidenced by several isotopic anomalies. Local destruction of He-3 by a similar amount could serve to help reconcile the expected increase in the He-3 abundance predicted by models of Galactic chemical evolution. We find, however, that the production of heavier elements, such as oxygen, places a strong constraint on the degree of He-3 destruction. We also explore the implications of both alternative models of Galactic chemical evolution and the stellar yields for He-3 in low-mass stars, which can explain the history of the He-3 concentration in the Galaxy. C1 CEA, DAPNIA, DSM, SERV ASTROPHYS, GIF SUR YVETTE, FRANCE. UNIV CHICAGO, ENRICO FERMI INST, DEPT ASTRON & ASTROPHYS, CHICAGO, IL 60637 USA. FERMILAB NATL ACCELERATOR LAB, NASA, FERMILAB ASTROPHYS CTR, BATAVIA, IL 60510 USA. INST ASTROPHYS, F-75014 PARIS, FRANCE. RP Scully, ST (reprint author), UNIV MINNESOTA, SCH PHYS & ASTRON, MINNEAPOLIS, MN 55455 USA. NR 88 TC 35 Z9 35 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 10 PY 1996 VL 462 IS 2 BP 960 EP 968 DI 10.1086/177209 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA UH187 UT WOS:A1996UH18700037 ER PT J AU Murin, Y Blann, M Gross, DHE Jakobsson, B AF Murin, Y Blann, M Gross, DHE Jakobsson, B TI On a possibility to distinguish between sequential and prompt multifragmentation in experiments SO EUROPHYSICS LETTERS LA English DT Article ID INTERMEDIATE-MASS FRAGMENTS; HOT NUCLEI; EMISSION; DECAY; COLLISIONS; YIELDS AB Predictions on ratios between the yield of light isotopes (Li, Be, B and C) from Sn-112 and Sn-124 nuclei from a microcanonical multifragmentation model and a sequential evaporation model are compared at excitation 175-800 MeV. Secondary decay does not affect these ratios significantly, which make them useful to estimate the excitation energy at the instant of fragmentation. The excitation energy dependence agrees well except for a local minimum near the onset of multifragmentation predicted only by the microcanonical model due to coupling between exit channels. This offers a way to distinguish between the models by measuring the relative yields of fragments from target residues differing significantly only in their neutron numbers. C1 VG KHLOPIN RADIUM INST,SU-197022 ST PETERSBURG,RUSSIA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HAHN MEITNER INST BERLIN GMBH,BEREICH PHYS,D-1000 BERLIN,GERMANY. RP Murin, Y (reprint author), LUND UNIV,DEPT PHYS,SOLVEGATAN 14,S-22362 LUND,SWEDEN. NR 35 TC 4 Z9 4 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAY 10 PY 1996 VL 34 IS 5 BP 337 EP 342 DI 10.1209/epl/i1996-00461-5 PG 6 WC Physics, Multidisciplinary SC Physics GA UM199 UT WOS:A1996UM19900004 ER PT J AU Beretvas, A AF Beretvas, A TI CDF results on top SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Review ID PROTON-ANTIPROTON COLLISIONS; = 1.8 TEV; QUARK MASS; SEARCH; ELECTRON+JETS; EVENTS; LIMIT AB CDF has established the existence of the top quark. Results from p (p) over bar collisions at root s = 1.8 TeV are presented. In the dilepton final state we find seven events with a background of 1.3 +/- 0.3. In the e, mu + nu + jets channel with a b identified via a secondary vertex detector (SVX), we find 21 events with a background of 5.5 +/- 1.8. We measure the top quark mass to be 176 +/- 8 (stat) +/-10 (syst) GeV/c(2), and the t (t) over bar production cross section to be 7.6(-2.0)(+2.4) pb. The integrated luminosity for the results presented in this paper is 67 pb(-1). The CDF detector needs to be upgraded for our next run. The integrated luminosity for the next run is expected to be more than 1000 pb(-1). RP Beretvas, A (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD MAY 10 PY 1996 VL 11 IS 12 BP 2045 EP 2064 DI 10.1142/S0217751X96001036 PG 20 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA UK675 UT WOS:A1996UK67500001 ER PT J AU Clubok, K Halpern, MB AF Clubok, K Halpern, MB TI The WZW model as a dynamical system on affine Lie groups SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID WESS-ZUMINO MODEL; CURRENT-ALGEBRA; 2 DIMENSIONS AB Working directly on affine Lie groups, we construct several new formulations of the WZW model. In one formulation WZW is expressed as a one-dimensional mechanical system whose variables are coordinates on the affine Lie group. When written in terms of the affine group element, this formulation exhibits a two-dimensional WZW term. In another formulation WZW is written as a two-dimensional field theory, with a three-dimensional WZW term, whose fields are coordinates on the affine group. On the basis of these equivalent formulations, we develop a translation dictionary in which the new formulations on the affine Lie group are understood as mode formulations of the conventional WZW formulation on the Lie group. Using this dictionary, we also express WZW as a three-dimensional field theory on the Lie group with a four-dimensional WZW term. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP Clubok, K (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD MAY 10 PY 1996 VL 11 IS 12 BP 2167 EP 2212 DI 10.1142/S0217751X96001097 PG 46 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA UK675 UT WOS:A1996UK67500007 ER PT J AU Cohen, D Patzek, TW Radke, CJ AF Cohen, D Patzek, TW Radke, CJ TI Two-dimensional network simulation of diffusion-driven coarsening of foam inside a porous medium SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article DE foam; porous media; diffusion; network simulation ID STABILITY AB In order to use foams in subsurface applications, it is necessary to understand their stability in porous media. Diffusion-driven coarsening of a stationary or nonflowing foam in a porous medium results in changing gas pressures and a coarsening of the foam texture. A two-dimensional network simulation has been created that predicts the behavior of foam in a porous medium by physically specifying the locations of all the lamellae in the system and by solving the complete set of Young-Laplace and diffusion equations. An hourglass approximates the shape of the pores, and the pore walls are considered to be highly water wet. A singularity arises in the system of differential algebraic equations due to the curvature of the pore walls. This singularity is a signal that the system must undergo oscillations or sudden lamellar rearrangements before the diffusion process can continue. Newton-Raphson iteration is used along with Keller's method of are-length continuation and a new jump resolution technique to locate and resolve bifurcations in the system of coupled lamellae. Gas bubbles in pore throats are regions of encapsulated pressure. As gas is released from these bubbles during diffusion, the pressure of the bubbles in the pore bodies increases. When the pressure increase is scaled by the characteristic Young-Laplace pressure, the equilibrium time for the diffusion process is scaled by the ratio of the square of the characteristic length to the gas diffusivity and two dimensionless groups. One describes the ease with which gas can diffuse through a lamella, and the second represents the amount of gas encapsulated within the pore throats initially. Given this scaling, the resulting plots of pressure versus time and normalized lamellae positions versus time are universal for all system sizes and characteristics. This is true as long as the initial lamella distribution is the same in each case. (C) 1996 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. NR 20 TC 9 Z9 9 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD MAY 10 PY 1996 VL 179 IS 2 BP 357 EP 373 DI 10.1006/jcis.1996.0227 PG 17 WC Chemistry, Physical SC Chemistry GA UM257 UT WOS:A1996UM25700005 ER PT J AU Faguy, PW Marinkovic, NS Adzic, RR AF Faguy, PW Marinkovic, NS Adzic, RR TI Infrared spectroscopic analysis of anions adsorbed from bisulfate-containing solutions on Pt(111) electrodes SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE IR spectroscopy; anions; bisulfate; Pt(111) electrode ID REFLECTION ABSORPTION-SPECTROSCOPY; PLATINUM STEPPED SURFACES; SINGLE-CRYSTAL ELECTRODES; SULFURIC-ACID; SULFATE ADSORPTION; VIBRATIONAL SPECTROSCOPY; POLYCRYSTALLINE PLATINUM; HYDROGEN ADSORPTION; PT(100) ELECTRODES; IR SPECTROSCOPY AB In situ FTIR spectroscopy has been used to study the potential dependent changes in anion structure and composition at the surface of Pt(111) electrodes in HSO4--containing solutions. From the infrared differential normalized relative reflectance data, the maximum rate of intensity changes for three infrared bands can be obtained. Two modes associated with the adsorbed anion and one mode assigned to solution-phase bisulfate all have extrema coinciding with the spike in the anomalous region of the cyclic voltammetry. The adsorbed species is not adequately described as either sulfate or bisulfate; the data are more consistent with an adsorbed H3O+-SO42- ion pair, possibly with the three unprotonated sulfate oxygens interacting with Pt sites. A weak band at 940 cm(-1) correlates with the 1200-1250 cm(-1) band and is assigned to the S-O(H3O+) stretch of the ion pair. A band at 1040 cm(-1), which disappears with increasingly more positive sample potentials, is assigned to the symmetric stretching mode for solution-phase bisulfate ions. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV CHEM SCI,UPTON,NY 11973. RP Faguy, PW (reprint author), UNIV LOUISVILLE,DEPT CHEM,LOUISVILLE,KY 40292, USA. RI Marinkovic, Nebojsa/A-1137-2016 OI Marinkovic, Nebojsa/0000-0003-3579-3453 NR 53 TC 61 Z9 61 U1 3 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAY 10 PY 1996 VL 407 IS 1-2 BP 209 EP 218 DI 10.1016/0022-0728(95)04494-9 PG 10 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA UY431 UT WOS:A1996UY43100026 ER PT J AU Mayeda, K Walter, WR AF Mayeda, K Walter, WR TI Moment, energy, stress drop, and source spectra of western United States earthquakes from regional coda envelopes SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID 1989 LOMA-PRIETA; SOURCE PARAMETERS; WAVE ENERGY; MAGNITUDE RELATIONS; TECTONIC STRESS; SINGLE STATION; CALIFORNIA; SCATTERING; RELEASE; ATTENUATION AB We present a new method to estimate stable seismic source parameters, such as energy, moment, and Orowan stress drop, using regional coda envelopes from as few as one broadband station. We use the method to compute path- and site-corrected seismic moment-rate spectra for 117 recent western United States earthquakes. Empirical Green's function corrections were applied to our surface- and body-wave coda envelope measurements to generate S-wave source spectra. These source spectra provide stable, single-station estimates of radiated seismic energy E(s) and seismic moment M(o) that for common events are in excellent agreement with network-averaged estimates obtained using local and regional data. Teleseismic moment estimates are compatible with our regional results, but teleseismic energy estimates appear to be nearly an order of magnitude low. We estimated the seismic moment of events ranging between M(w) 2.2 and 7.3, and energy estimates for which we had measured at least 70% of the total energy, generally events above M(w) 3.3. We use these estimates to examine the behavior of derived parameters such as the Orowan stress drop (Delta sigma = 2 mu E(s)/M(o)). While the earthquakes we studied have a small range in Orowan stress drop, generally between 0.1 and 20 MPa, they show a strong tendency for Orowan stress drop to increase with moment, approximately as M(o)(0.25) We believe this is a source effect and is not due to inadequate bandwidth or attenuation correction, and note that this trend appears to continue for microearthquakes as described in a recent deep borehole study in southern California. Many of the large high stress drop earthquakes show complexity in their moment-rate spectra near the corner frequency and cannot be fit by a simple omega-square model. Instead, above the first corner frequency, the spectral decay ranges between f(-1.0) and f(-1.5). This leads to larger estimates of radiated energy than predicted with a simple omega-square model and has implications for seismic hazard estimation. Coda envelopes have three main advantages over direct arrivals for estimating seismic moment and energy: (1) Coda amplitudes vary little with geology and source-radiation anisotropy and allow accurate single-station applications; (2) path-corrected coda amplitude measurements can be applied to very large regions, allowing a comparison of source parameters throughout the western United States using a common methodology and stations; (3) because long-period coda can last for hours for large local and regional events, it allows the analysis of seismograms with clipped early arrivals. RP LAWRENCE LIVERMORE NATL LAB, GEOPHYS & GLOBAL SECUR DIV, CTBT PROGRAMS, L-205, PB 808, LIVERMORE, CA 94550 USA. RI Walter, William/C-2351-2013 OI Walter, William/0000-0002-0331-0616 NR 59 TC 183 Z9 193 U1 1 U2 8 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 MAY 10 PY 1996 VL 101 IS B5 BP 11195 EP 11208 DI 10.1029/96JB00112 PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA UL090 UT WOS:A1996UL09000003 ER PT J AU Johnson, PA Zinszner, B Rasolofosaon, PNJ AF Johnson, PA Zinszner, B Rasolofosaon, PNJ TI Resonance and elastic nonlinear phenomena in rock SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID WAVE; GENERATION; SANDSTONE AB In a great variety of laboratory experiments over large intervals in stress, strain, and frequency, rocks display pronounced nonlinear elastic behavior. Here we describe nonlinear response in rock from resonance experiments. Two important features of nonlinear resonant behavior are a shift in resonant frequency away from the linear resonant frequency as the amplitude of the disturbance is increased and the harmonics in the time signal that accompany this shift. We have conducted Young's mode resonance experiments using bars of a variety of rock types (limestone, sandstone, marble, chalk) and of varying diameters and lengths. Typically, samples with resonant frequencies of approximately 0.5-1.5 kHz display resonant frequency shifts of 10% or more, over strain intervals of 10(-7) to 10(-6) and under a variety of saturation conditions and ambient pressure conditions. Correspondingly rich harmonic spectra measured from the time signal progressively develop with increasing drive level. In our experiments to date, the resonant peak is observed to always shift downward (if indeed the peak shifts), indicating a net softening of the modulus with drive level. This observation is in agreement with our pulse mode and static test observations, and those of other researchers. Resonant peak shift is not always observed, even at large drive levels; however, harmonics are always observed even in the absence of peak shift when detected strain levels exceed 10(-7) or so. This is an unexpected result. Important implications for the classical perturbation model approach to resonance results from this work. Observations imply that stress-strain hysteresis and discrete memory may play an important role in dynamic measurements and should be included in modeling. This work also illustrates that measurement of linear modulus and Q must be undertaken with great caution when using resonance. C1 INST FRANCAIS PETR, F-92506 RUEIL MALMAISON, FRANCE. UNIV PARIS 06, LAB ACOUST PHYS, PARIS, FRANCE. RP Johnson, PA (reprint author), LOS ALAMOS NATL LAB, EES-4, MS D443, LOS ALAMOS, NM 87545 USA. NR 29 TC 119 Z9 127 U1 1 U2 8 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 MAY 10 PY 1996 VL 101 IS B5 BP 11553 EP 11564 DI 10.1029/96JB00647 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA UL090 UT WOS:A1996UL09000031 ER PT J AU Thomas, DM Paillet, FL Conrad, ME AF Thomas, DM Paillet, FL Conrad, ME TI Hydrogeology of the Hawaii scientific drilling project borehole KP-1 .2. Groundwater geochemistry and regional flow patterns SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID RADIOCARBON TIME SCALE; NORTH PACIFIC-OCEAN; C-14 DATA; CALIBRATION; BC; CARBON AB A series of downhole and surface water samples were taken from the I-km-deep KP-1 borehole located on the eastern flank of the island of Hawaii. Early samples from depths of more than 700 m showed salinities nearly equivalent to seawater but having anomalous cation concentrations that are attributed to ion exchange between formation fluids and residual drilling mud clays. Later deep samples found only minor variations from seawater cation chemistry that are consistent with low-temperature weathering of basalts; delta(18)O values are equivalent to seawater values and are consistent with this interpretation. Carbon 14 activities of dissolved inorganic carbonate indicate a water age ranging from 5890 to 7170 years B.P. and fluid transport rates of 1.8 to 2.2 m/yr. Fluid samples from perforations at 310 m in the borehole demonstrate that a freshwater aquifer is present at the Mauna Kea/Mauna Loa interface; borehole resistivity logs indicate that it is similar to 200 m thick. Although it has not yet been possible to obtain samples of the freshwater zone without contamination from the deep saline fluids, the chloride concentrations of the low-salinity zone are estimated using a mixing enthalpy calculation to be less than 100 mg/L. Light stable isotope data indicate that the fresh water at 320 m is derived from recharge entering the island at an average elevation of 2000 m. Inferred C-14 activities of the dissolved bicarbonate in the freshwater zone indicate an average calibrated age of 2200 years B.P. and an average fluid velocity of at least 14 m/yr. A regional water flow model is proposed that suggests that the fresh water found at the 320-m depth is derived from rainfall recharge from the middle elevations of Mauna Kea volcano. This rainfall is channeled beneath the Mauna Loa lavas by the thick soil layer separating the two volcanoes. A second shallow fresh-to-brackish water zone, derived from Mauna Loa recharge, is also inferred to exist below the carbonate formation that underlies the shallow basal lens. The results of our preliminary study of the groundwater system below the KP-1 drill site demonstrate that intervolcano and interflow aquicludes can have a substantial impact on water circulation and discharge from young island volcanoes. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. US GEOL SURVEY, DENVER, CO 80225 USA. RP Thomas, DM (reprint author), UNIV HAWAII MANOA, HAWAII INST GEOPHYS & PLANETOL, SOEST, 2525 CORREA RD, HONOLULU, HI 96822 USA. RI Conrad, Mark/G-2767-2010 NR 35 TC 14 Z9 14 U1 1 U2 5 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 MAY 10 PY 1996 VL 101 IS B5 BP 11683 EP 11694 DI 10.1029/95JB03845 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA UL090 UT WOS:A1996UL09000045 ER PT J AU Gao, JM Cheng, XH Chen, RD Sigal, GB Bruce, JE Schwartz, BL Hofstadler, SA Anderson, GA Smith, RD Whitesides, GM AF Gao, JM Cheng, XH Chen, RD Sigal, GB Bruce, JE Schwartz, BL Hofstadler, SA Anderson, GA Smith, RD Whitesides, GM TI Screening derivatized peptide libraries for tight binding inhibitors to carbonic anhydrase II by electrospray ionization mass spectrometry SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID BIOMOLECULES AB This paper describes the use of electrospray ionization-mass spectrometry (ESI-MS) to screen two libraries of soluble compounds to search for tight binding inhibitors for carbonic anhydrase II (EC 4.2.1.1). The two libraries, H2NO2SC6H4C(O)NH-AA(1)-AA(2)-C(O)NHCH2CH2CO2H (1), where AA(1) and AA(2) are L-amino acids (library size: 289 compounds) or D-amino acids (256 compounds), were constructed by attaching tripeptides to the carboxyl group of 4-carboxybenzenesulfonamide. Screening of both libraries yielded, as the tightest binding inhibitor, compound 1 (AA(1) = AA(2) = L-Leu; binding constant K-b = 1.4 X 10(8) M(-1)). The ability of ESI-MS to estimate simultaneously the relative binding affinities of a protein to soluble ligands in a library, if general, should be useful in drug development. C1 HARVARD UNIV, DEPT CHEM, CAMBRIDGE, MA 02138 USA. PACIFIC NW NATL LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NIGMS NIH HHS [GM 30367] NR 21 TC 140 Z9 142 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-2623 EI 1520-4804 J9 J MED CHEM JI J. Med. Chem. PD MAY 10 PY 1996 VL 39 IS 10 BP 1949 EP 1955 DI 10.1021/jm960013g PG 7 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA UM248 UT WOS:A1996UM24800006 PM 8642553 ER PT J AU Gatley, SJ Meehan, SM Chen, R Pan, DF Schechter, MD Dewey, SL AF Gatley, SJ Meehan, SM Chen, R Pan, DF Schechter, MD Dewey, SL TI Place preference and microdialysis studies with two derivatives of methylphenidate SO LIFE SCIENCES LA English DT Letter DE place preference; microdialysis studies; methylphenidate ID COCAINE; DOPAMINE; BINDING; TRANSPORTERS; PHARMACOLOGY; DEPENDENCE; AFFINITY; ABUSE AB Conditioned place preference studies with derivatives of dl-threo-methylphenidate (Ritalin) which bear a bromine atom or a methoxy group on the pam position of the phenyl ring are reported. Both derivatives, as well as methylphenidate itself, induced a significant increase in place preference when administered i/p to rats at 10 mg/Kg, compared with saline conditioned controls. The change for p-bromomethylphenidate was slightly greater than that seen for methylphenidate or p-methoxymethylphenidate. Extracellular dopamine in the striatum, and locomotor activity, were also increased by i/p administration of p-methoxymethyiphenidate (20 mg/Kg) to a similar extent to the increases seen with this dose of methylphenidate or p-bromomethylphenidate in an earlier study (Pan et al. fur. J. Pharmacol. 264: 177-182, 1994). Administration of p-methoxymethylphenidate failed to abolish increases in extracellular dopamine and locomotor activity induced by subsequent administration of cocaine (20 mg/Kg). It is concluded that the methylphenidate derivatives share the general pharmacological properties of other psychostimulant drugs. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NE OHIO UNIV,COLL MED,DEPT PHARMACOL,ROOTSTOWN,OH 44272. RP Gatley, SJ (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 32 TC 16 Z9 16 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0024-3205 J9 LIFE SCI JI Life Sci. PD MAY 10 PY 1996 VL 58 IS 24 BP PL345 EP PL352 PG 8 WC Medicine, Research & Experimental; Pharmacology & Pharmacy SC Research & Experimental Medicine; Pharmacology & Pharmacy GA UK527 UT WOS:A1996UK52700010 ER PT J AU Han, T Huang, Z Hung, PQ AF Han, T Huang, Z Hung, PQ TI A model of low-lying states in strongly interacting electroweak symmetry-breaking sector SO MODERN PHYSICS LETTERS A LA English DT Article ID WEAK INTERACTIONS; HIGGS SECTOR; VECTOR AB It is proposed that, in a strongly-interacting electroweak sector, besides the Goldstone bosons, the coexistence of a scalar state (H) and vector resonances such as A(1) [I-G(J(P)) = 1-(1(+))], V [1+(1(-))] and omega(H) [0(-)(1(-))] is required by the proper Regge behavior of the forward scattering amplitudes. This is a consequence of the following well-motivated assumptions: (a) Adler-Weisberger-type sum rules and the superconvergence relations for scattering amplitudes hold in this strongly interacting sector; (b) the sum rules at t = 0 are saturated by a minimal set of low-lying states with appropriate quantum numbers. It therefore suggests that a complete description should include all these resonances. These states may lead to distinctive experimental signatures at future colliders. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. RP Han, T (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 30 TC 3 Z9 3 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD MAY 10 PY 1996 VL 11 IS 14 BP 1131 EP 1137 DI 10.1142/S0217732396001168 PG 7 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA UN830 UT WOS:A1996UN83000003 ER PT J AU Stevens, T McKinley, J AF Stevens, T McKinley, J TI Hydrogen-based microbial ecosystems in the Earth - Reply SO SCIENCE LA English DT Article ID BIOSPHERE; DEEP RP Stevens, T (reprint author), PACIFIC NW NATL LAB,EARTH SYST SCI DEPT,RICHLAND,WA 99352, USA. NR 7 TC 6 Z9 6 U1 1 U2 3 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 10 PY 1996 VL 272 IS 5263 BP 896 EP 897 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UK757 UT WOS:A1996UK75700067 ER PT J AU Newell, JA Edie, DD Fuller, EL AF Newell, JA Edie, DD Fuller, EL TI Kinetics of carbonization and graphitization of PBO fiber SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID PITCHES AB PBO [poly(p-phenylenebenzobisoxazole)] fiber has been shown to convert to an ordered carbon fiber without the need for stabilization. This article presents the first detailed analysis of the carbonization and graphitization behavior of this unique material. The carbonization process was modeled as a series of free-radical reactions, and thermogravimetric analysis was used to determine an activation energy of 76 +/- 6 kcal/mol for the thermal initiation of free radicals. The initiation reaction data then were applied to determine the temperature dependence of the termination reaction. Additionally, the development of long-range order in the graphitizing fiber was examined. The spacing between graphene planes was shown to decrease with increasing treatment temperature and soak duration. Carbonized PBO fibers developed more long-range order than carbon fibers produced from other polymers, which may partially explain why these PBO-based fibers display excellent lattice-dependent properties. Finally, an Arrhenius analysis found the activation energy for graphitization to be 120 +/- 17 kcal/mol. (C) 1996 John Wiley & Sons, Inc. C1 CLEMSON UNIV,DEPT CHEM ENGN,CLEMSON,SC 29634. CLEMSON UNIV,CTR ADV ENGN FIBERS,CLEMSON,SC 29634. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP Newell, JA (reprint author), UNIV N DAKOTA,DEPT CHEM ENGN,GRAND FORKS,ND 58202, USA. NR 21 TC 22 Z9 24 U1 2 U2 9 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD MAY 9 PY 1996 VL 60 IS 6 BP 825 EP 832 DI 10.1002/(SICI)1097-4628(19960509)60:6<825::AID-APP5>3.0.CO;2-L PG 8 WC Polymer Science SC Polymer Science GA UF014 UT WOS:A1996UF01400005 ER PT J AU Tarrant, DH Getty, JD Liu, XM Kelly, PB AF Tarrant, DH Getty, JD Liu, XM Kelly, PB TI Resonance Raman spectroscopy of the 1-methylallyl radical SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ALLYL CHLORIDE; VIBRATIONS; 1-BUTENE; SPECTRUM; DYNAMICS; CATION; IONS AB The first vibrational spectrum of the 1-methylallyl radical is detected using resonance Raman spectroscopy with excitation from 237 to 232 nm. The vibrational frequencies of five symmetric fundamentals, the H3C-CCC bend, the CCC bend, the H3C-C stretch, the C-H in plane bend, and the CH2 scissors, of the 1-methylallyl radical are reported. The even overtones of the CH3 torsion, the C-H out of plane bend, the H3C-CCC bend, and the CCC bend are identified. The vibrational assignments of the resonance Raman spectra are based upon comparison with calculated vibrational frequencies generated by UHF method using a 6-31G* basis set and experimental values for the allyl radical, the beta-methylallyl radical, and similar molecules. Excitation at 236.05 and 234.95 nm yields significant resonance enhancement of overtone and combination bands associated with the H3C-CCC bend and CCC bend, respectively. The variation of intensities in the Raman spectra with excitation wavelength yields excited state vibrational frequencies for the H3C-CCC bend and CCC symmetric bend of 305 and 502 cm(-1), respectively. Examination of the observed intensity patterns in the resonance Raman spectra indicates that the initial excited state dynamics of the 1-methylallyl radical are dominated by bending motions of the carbon chain. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM,DAVIS,CA 95616. NR 35 TC 6 Z9 6 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 9 PY 1996 VL 100 IS 19 BP 7772 EP 7777 DI 10.1021/jp9526253 PG 6 WC Chemistry, Physical SC Chemistry GA UK169 UT WOS:A1996UK16900005 ER PT J AU Kouri, DJ Huang, YH Hoffman, DK AF Kouri, DJ Huang, YH Hoffman, DK TI Direct approach to density functional theory: Heaviside-Fermi level operator using a pseudopotential treatment SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID APPROXIMATING FUNCTION-THEORY; ELECTRONIC-STRUCTURE; MOLECULAR-DYNAMICS; DIATOMIC-MOLECULES; TOTAL-ENERGY; SYSTEMS; FORMALISM; MATRIX; ENERGETICS; SCATTERING AB A new method is presented for calculating electron densities in nonperiodic, polyatomic systems using Cartesian coordinates in three dimensions. The method blends a direct approach to spin-density-functional theory and uses (1) the ''Heaviside-Fermi level operator'' h(E(F) - (H) over cap) rather than solving Schrodinger eigenvalue problems, (2) the distributed approximating functional for discretization and interpolation, (3) a multigrid iteration procedure for accelerating the convergence, (4) a separable, nonlocal form of pseudopotential, and (5) a fast method for solving Poisson's equation in nonperiodic systems. Example calculations of the electronic structure for the Ne atom and the C-2 and O-2 dimers are presented. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP Kouri, DJ (reprint author), UNIV HOUSTON,DEPT CHEM,UNIV PK,HOUSTON,TX 77204, USA. NR 52 TC 6 Z9 6 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 9 PY 1996 VL 100 IS 19 BP 7903 EP 7910 DI 10.1021/jp953339u PG 8 WC Chemistry, Physical SC Chemistry GA UK169 UT WOS:A1996UK16900019 ER PT J AU Kwei, GH Morosin, B AF Kwei, GH Morosin, B TI Structures of the boron-rich boron carbides from neutron powder diffraction: Implications for the nature of the inter-icosahedral chains SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article AB Results from structure refinement using neutron powder diffraction data for boron carbide samples with 10, 13, 16, and 20 at. % carbon are reviewed. Those obtained for ceramic powder samples show an apparent large vacancy concentration (as high as 25%) at the central atom position of the linear three-membered chains. A model deduced from the previous X-ray structure of the boron-rich end member, B9C, suggests the shift of sufficient scattering density from the central chain position into adjacent voids to account for the observed vacancies. On the other hand, neutron powder diffraction from ground, Cu-melt-grown single crystals gives a structure which shows no such vacancies. This, together with results from sequential runs with the same ceramic sample, suggests that the vacancies in the ceramic materials are intrinsic to their synthesis and do not result from radiation damage, as has been suggested. Our results support the more recent interpretation of other experimental results concerning the nature of the three-membered C-B-C chains in the boron carbides, i.e., that the bonding to the central atom is very weak. Further, low-temperature structural studies of the ground single crystals suggest that even at the nominal B4C composition, there is site disorder at the chain-end ''C'' site. It is most likely that this disorder arises from the presence of boron (or C-B-B) chains. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP Kwei, GH (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 39 TC 92 Z9 93 U1 4 U2 25 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 9 PY 1996 VL 100 IS 19 BP 8031 EP 8039 DI 10.1021/jp953235j PG 9 WC Chemistry, Physical SC Chemistry GA UK169 UT WOS:A1996UK16900037 ER PT J AU Harder, A Lieb, KP Cunningham, R Gelletly, W Gross, CJ Hannachi, F Kabadiyski, MK Roth, HA Rudolph, D Simpson, J Skeppstedt, O Varley, BJ Warner, DD AF Harder, A Lieb, KP Cunningham, R Gelletly, W Gross, CJ Hannachi, F Kabadiyski, MK Roth, HA Rudolph, D Simpson, J Skeppstedt, O Varley, BJ Warner, DD TI A new type of band crossing at large deformation SO PHYSICS LETTERS B LA English DT Article ID PROTON; NUCLEI; RB-77 AB A detailed study of the positive parity yrast and yrare rotational bands in Rb-77 is presented. Using the reaction Ca-40(Ca-40,3p) and the EUROGAM I spectrometer, gamma gamma gamma coincidences enabled us to follow both bands over a large spin range and to measure many E2 strengths. The moments of inertia and transition quadrupole moments indicate that a more deformed band (epsilon(2) approximate to 0.38) is crossed by a less deformed one (epsilon(2) approximate to 0.29), Since the yrare band starts at the extremely low spin value of I = 9/2, the conventional band crossing mechanism of two aligning high-j quasiparticles is excluded. The frequency-dependent equilibrium shapes were calculated with Nilsson-Strutinsky type calculations using a diabatic tracing of configurations near the neutron Fermi level, This is the first observation of such a band crossing. C1 ROSSENDORF INC,FORSCHUNGSZENTRUM ROSSENDORF EV,D-01314 DRESDEN,GERMANY. CCLRC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. UNIV SURREY,DEPT PHYS,GUILDFORD GU2 5XH,SURREY,ENGLAND. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. CHALMERS UNIV TECHNOL,DEPT PHYS,S-41296 GOTHENBURG,SWEDEN. UNIV MANCHESTER,SCHUSTER LAB,MANCHESTER M13 9PL,LANCS,ENGLAND. RP Harder, A (reprint author), UNIV GOTTINGEN,INST PHYS 2,D-37073 GOTTINGEN,GERMANY. RI Rudolph, Dirk/D-4259-2009 OI Rudolph, Dirk/0000-0003-1199-3055 NR 19 TC 12 Z9 12 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 MAY 9 PY 1996 VL 374 IS 4 BP 277 EP 282 DI 10.1016/0370-2693(96)00184-0 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UM345 UT WOS:A1996UM34500001 ER PT J AU Acciarri, M Adam, A Adriani, O AguilarBenitez, M Ahlen, S Alpat, B Alcaraz, J Alemanni, G Allaby, J Aloisio, A Alverson, G Alviggi, MG Ambrosi, G Anderhub, H Andreev, VP Angelescu, T Antreasyan, D Arefiev, A Azemoon, T Aziz, T Bagnaia, P Baksay, L Ball, RC Banerjee, S Banicz, K Barillere, R Barone, L Bartalini, P Baschirotto, A Basile, M Battiston, R Bay, A Becattini, F Becker, U Behner, F Berdugo, J Berges, P Bertucci, B Betev, BL Biasini, M Biland, A Bilei, GM Blaising, JJ Blyth, SC Bobbink, GJ Bock, R Bohm, A Borgia, B Boucham, A Bourilkov, D Bourquin, M Boutigny, D Brambilla, E Branson, JG Brigljevic, V Brock, IC Buijs, A Bujak, A Burger, JD Burger, WJ Busenitz, J Buytenhuijs, A Cai, XD Campanelli, M Capell, M Romeo, GC Caria, M Carlino, G Cartacci, AM Casaus, J Castellini, G Castello, R Cavallari, F Cavallo, N Cecchi, C Cerrada, M Cesaroni, F Chamizo, M Chan, A Chang, YH Chaturvedi, UK Chemarin, M Chen, A Chen, C Chen, G Chen, GM Chen, HF Chen, HS Chen, M Chiefari, G Chien, CY Choi, MT Cifarelli, L Cindolo, F Civinini, C Clare, I Clare, R Cohn, HO Coignet, G Colijn, AP Colino, N Commichau, V Costantini, S Cotorobai, F delaCruz, B Dai, TS DAlessandro, R deAsmundis, R DeBoeck, H Degre, A Deiters, K Denes, P DeNotaristefani, F DiBitonto, D Diemoz, M vanDierendonck, D DiLodovico, F Dionisi, C Dittmar, M Dominguez, A Doria, A Dorne, I Dova, MT Drago, E Duchesneau, D Duinker, P Duran, I Dutta, S Easo, S Efremenko, Y ElMamouni, H Engler, A Eppling, FJ Erne, FC Ernenwein, JP Extermann, P Fabre, M Faccini, R Falciano, S Favara, A Fay, J Felcini, M Ferguson, T Fernandez, D Ferroni, F Fesefeldt, H Fiandrini, E Field, JH Filthaut, F Fisher, PH Forconi, G Fredj, L Freudenreich, K Galaktionov, Y Ganguli, SN Gau, SS Gentile, S Gerald, J Gheordanescu, N Giagu, S Goldfarb, S Goldstein, J Gong, ZF Gougas, A Gratta, G Gruenewald, MW Gupta, VK Gurtu, A Gutay, LJ Hangarter, K Hartmann, B Hasan, A He, JT Hebbeker, T Herve, A vanHoek, WC Hofer, H Hoorani, H Hou, SR Hu, G Ilyas, MM Innocente, V Janssen, H Jin, BN Jones, LW deJong, P JosaMutuberria, I Kasser, A Khan, RA Kamyshkov, Y Kapinos, P Kapustinsky, JS Karyotakis, Y Kaur, RA KienzleFocacci, MN Kim, D Kim, JK Kim, SC Kim, YG Kinnison, WW Kirkby, A Kirkby, D Kirkby, J Kittel, W Klimentov, A Konig, AC Kongeter, A Korolko, I Koutsenko, V Koulbardis, A Kraemer, RW Kramer, T Krenz, W Kuijten, H Kunin, A deGuevara, PL Landi, G Lapoint, C LassilaPerini, K Lebeau, M Lebedev, A Lebrun, P Lecomte, P Lecoq, P LeCoultre, P Lee, JS Lee, KY Leggett, C LeGoff, JM Leiste, R Lenti, M Leonardi, E Levtchenko, P Li, C Lieb, E Lin, WT Linde, FL Lindemann, B Lista, L Liu, ZA Lohmann, W Longo, E Lu, W Lu, YS Lubelsmeyer, K Luci, C Luckey, D Ludovici, L Luminari, L Lustermann, W Ma, WG Macchiolo, A Maity, M Majumder, G Malgeri, L Malinin, A Mana, C Mangla, S Marchesini, P Marin, A Martin, JP Marzano, F Massaro, GGG Mazumdar, K McNally, D Mele, S Merola, L Meschini, M Metzger, WJ vonderMey, M Mi, Y Mihul, A vanMil, AJW Mirabelli, G Mnich, J Moller, M Monteleoni, B Moore, R Morganti, S Mount, R Muller, S Muheim, F Nagy, E Nahn, S Napolitano, M NessiTedaldi, E Newman, H Nippe, A Nowak, H Organtini, G Ostonen, R Pandoulas, D Paoletti, S Paolucci, P Park, HK Pascale, G Passaleva, G Particelli, D Paul, T Pauluzzi, P Paus, C Pauss, F Peach, D Pei, YJ Pensotti, S PerretGallix, D Petrak, S Pevsner, A Piccolo, D Pieri, M Pinto, JC Piroue, PA Pistolesi, E Plyaskin, V Pohl, M Pojidaev, V Postema, H Produit, N Raghavan, R RahalCallot, G Rancoita, PG Rattaggi, M Raven, G Razis, P Read, K Redaelli, M Ren, D Rescigno, M Reucroft, S Ricker, A Riemann, S Riemers, BC Riles, K Rind, O Ro, S Robohm, A Rodin, J Rodriguez, FJ Roe, BP Rohner, S Romero, L RosierLees, S Rosselet, P vanRossum, W Roth, S Rubio, JA Rykaczewski, H Salicio, J Sanchez, E Santocchia, A Sarakinos, ME Sarkar, S Sassowsky, M Sauvage, G Schafer, C Schegelsky, V SchmidtKaerst, S Schmitz, D Schmitz, P Schneegans, M Schoeneich, B Scholz, N Schopper, H Schotanus, DJ Schulte, R Schultze, K Schwenke, J Schwering, G Sciacca, C Sciarrino, D Sens, JC Servoli, L Shevchenko, S Shivarov, N Shoutko, V Shukla, J Shumilov, E Siedenburg, T Son, D Sopczak, A Soulimov, V Smith, B Spillantini, P Steuer, M Stickland, DP Sticozzi, F Stone, H Stoyanov, B Straessner, A Strauch, K Sudhakar, K Sultanov, G Sun, LZ Susinno, GF Suter, H Swain, JD Tang, XW Tauscher, L Taylor, L Ting, SCC Ting, SM Toker, O Tonisch, F Tonutti, M Tonwar, SC Toth, J Tsaregorodtsev, A Tully, C Tuchscherer, H Tung, KL Ulbricht, J Uwer, U Valente, E VandeWalle, RT Vetlitsky, I Viertel, C Vivargent, M Volkert, R Vogel, H Vogt, H Vorobiev, I Vorobyov, AA Vorobyov, AA Vorvolakos, A Wadhwa, M Wallraff, W Wang, JC Wang, XL Wang, YF Wang, ZM Weber, A Wittgenstein, F Wu, SX Wynhoff, S Xu, J Xu, ZZ Yang, BZ Yang, CG Yao, XY Ye, JB Yeh, SC You, JM Zaccardelli, C Zalite, A Zemp, P Zeng, JY Zeng, Y Zhang, Z Zhou, B Zhou, GJ Zhou, Y Zhu, GY Zhu, RY Zichichi, A AF Acciarri, M Adam, A Adriani, O AguilarBenitez, M Ahlen, S Alpat, B Alcaraz, J Alemanni, G Allaby, J Aloisio, A Alverson, G Alviggi, MG Ambrosi, G Anderhub, H Andreev, VP Angelescu, T Antreasyan, D Arefiev, A Azemoon, T Aziz, T Bagnaia, P Baksay, L Ball, RC Banerjee, S Banicz, K Barillere, R Barone, L Bartalini, P Baschirotto, A Basile, M Battiston, R Bay, A Becattini, F Becker, U Behner, F Berdugo, J Berges, P Bertucci, B Betev, BL Biasini, M Biland, A Bilei, GM Blaising, JJ Blyth, SC Bobbink, GJ Bock, R Bohm, A Borgia, B Boucham, A Bourilkov, D Bourquin, M Boutigny, D Brambilla, E Branson, JG Brigljevic, V Brock, IC Buijs, A Bujak, A Burger, JD Burger, WJ Busenitz, J Buytenhuijs, A Cai, XD Campanelli, M Capell, M Romeo, GC Caria, M Carlino, G Cartacci, AM Casaus, J Castellini, G Castello, R Cavallari, F Cavallo, N Cecchi, C Cerrada, M Cesaroni, F Chamizo, M Chan, A Chang, YH Chaturvedi, UK Chemarin, M Chen, A Chen, C Chen, G Chen, GM Chen, HF Chen, HS Chen, M Chiefari, G Chien, CY Choi, MT Cifarelli, L Cindolo, F Civinini, C Clare, I Clare, R Cohn, HO Coignet, G Colijn, AP Colino, N Commichau, V Costantini, S Cotorobai, F delaCruz, B Dai, TS DAlessandro, R deAsmundis, R DeBoeck, H Degre, A Deiters, K Denes, P DeNotaristefani, F DiBitonto, D Diemoz, M vanDierendonck, D DiLodovico, F Dionisi, C Dittmar, M Dominguez, A Doria, A Dorne, I Dova, MT Drago, E Duchesneau, D Duinker, P Duran, I Dutta, S Easo, S Efremenko, Y ElMamouni, H Engler, A Eppling, FJ Erne, FC Ernenwein, JP Extermann, P Fabre, M Faccini, R Falciano, S Favara, A Fay, J Felcini, M Ferguson, T Fernandez, D Ferroni, F Fesefeldt, H Fiandrini, E Field, JH Filthaut, F Fisher, PH Forconi, G Fredj, L Freudenreich, K Galaktionov, Y Ganguli, SN Gau, SS Gentile, S Gerald, J Gheordanescu, N Giagu, S Goldfarb, S Goldstein, J Gong, ZF Gougas, A Gratta, G Gruenewald, MW Gupta, VK Gurtu, A Gutay, LJ Hangarter, K Hartmann, B Hasan, A He, JT Hebbeker, T Herve, A vanHoek, WC Hofer, H Hoorani, H Hou, SR Hu, G Ilyas, MM Innocente, V Janssen, H Jin, BN Jones, LW deJong, P JosaMutuberria, I Kasser, A Khan, RA Kamyshkov, Y Kapinos, P Kapustinsky, JS Karyotakis, Y Kaur, RA KienzleFocacci, MN Kim, D Kim, JK Kim, SC Kim, YG Kinnison, WW Kirkby, A Kirkby, D Kirkby, J Kittel, W Klimentov, A Konig, AC Kongeter, A Korolko, I Koutsenko, V Koulbardis, A Kraemer, RW Kramer, T Krenz, W Kuijten, H Kunin, A deGuevara, PL Landi, G Lapoint, C LassilaPerini, K Lebeau, M Lebedev, A Lebrun, P Lecomte, P Lecoq, P LeCoultre, P Lee, JS Lee, KY Leggett, C LeGoff, JM Leiste, R Lenti, M Leonardi, E Levtchenko, P Li, C Lieb, E Lin, WT Linde, FL Lindemann, B Lista, L Liu, ZA Lohmann, W Longo, E Lu, W Lu, YS Lubelsmeyer, K Luci, C Luckey, D Ludovici, L Luminari, L Lustermann, W Ma, WG Macchiolo, A Maity, M Majumder, G Malgeri, L Malinin, A Mana, C Mangla, S Marchesini, P Marin, A Martin, JP Marzano, F Massaro, GGG Mazumdar, K McNally, D Mele, S Merola, L Meschini, M Metzger, WJ vonderMey, M Mi, Y Mihul, A vanMil, AJW Mirabelli, G Mnich, J Moller, M Monteleoni, B Moore, R Morganti, S Mount, R Muller, S Muheim, F Nagy, E Nahn, S Napolitano, M NessiTedaldi, E Newman, H Nippe, A Nowak, H Organtini, G Ostonen, R Pandoulas, D Paoletti, S Paolucci, P Park, HK Pascale, G Passaleva, G Particelli, D Paul, T Pauluzzi, P Paus, C Pauss, F Peach, D Pei, YJ Pensotti, S PerretGallix, D Petrak, S Pevsner, A Piccolo, D Pieri, M Pinto, JC Piroue, PA Pistolesi, E Plyaskin, V Pohl, M Pojidaev, V Postema, H Produit, N Raghavan, R RahalCallot, G Rancoita, PG Rattaggi, M Raven, G Razis, P Read, K Redaelli, M Ren, D Rescigno, M Reucroft, S Ricker, A Riemann, S Riemers, BC Riles, K Rind, O Ro, S Robohm, A Rodin, J Rodriguez, FJ Roe, BP Rohner, S Romero, L RosierLees, S Rosselet, P vanRossum, W Roth, S Rubio, JA Rykaczewski, H Salicio, J Sanchez, E Santocchia, A Sarakinos, ME Sarkar, S Sassowsky, M Sauvage, G Schafer, C Schegelsky, V SchmidtKaerst, S Schmitz, D Schmitz, P Schneegans, M Schoeneich, B Scholz, N Schopper, H Schotanus, DJ Schulte, R Schultze, K Schwenke, J Schwering, G Sciacca, C Sciarrino, D Sens, JC Servoli, L Shevchenko, S Shivarov, N Shoutko, V Shukla, J Shumilov, E Siedenburg, T Son, D Sopczak, A Soulimov, V Smith, B Spillantini, P Steuer, M Stickland, DP Sticozzi, F Stone, H Stoyanov, B Straessner, A Strauch, K Sudhakar, K Sultanov, G Sun, LZ Susinno, GF Suter, H Swain, JD Tang, XW Tauscher, L Taylor, L Ting, SCC Ting, SM Toker, O Tonisch, F Tonutti, M Tonwar, SC Toth, J Tsaregorodtsev, A Tully, C Tuchscherer, H Tung, KL Ulbricht, J Uwer, U Valente, E VandeWalle, RT Vetlitsky, I Viertel, C Vivargent, M Volkert, R Vogel, H Vogt, H Vorobiev, I Vorobyov, AA Vorobyov, AA Vorvolakos, A Wadhwa, M Wallraff, W Wang, JC Wang, XL Wang, YF Wang, ZM Weber, A Wittgenstein, F Wu, SX Wynhoff, S Xu, J Xu, ZZ Yang, BZ Yang, CG Yao, XY Ye, JB Yeh, SC You, JM Zaccardelli, C Zalite, A Zemp, P Zeng, JY Zeng, Y Zhang, Z Zhou, B Zhou, GJ Zhou, Y Zhu, GY Zhu, RY Zichichi, A TI Measurement of muon-pair production at 50GeVMU+MU; ASYMMETRY; ENERGIES AB Using the data recorded with the L3 detector at LEP, we study the process e(+)e(-) --> mu(+)mu(-)(gamma) for events with hard initial-slate photon radiation. The effective centre-of-mass energies of the muons range from 50 GeV to 86 GeV. The data sample corresponds to an integrated luminosity of 103.5 pb(-1) and yields 293 muon-pair events with a hard photon along the beam direction. The events are used to determine the cross sections and the forward-backward charge asymmetries at centre-of-mass energies below the Z resonance. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY. NATL INST NUCL & HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV AMSTERDAM, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. LAB ANNECY LE VIEUX PHYS PARTICULES, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV BASEL, INST PHYS, CH-4056 BASEL, SWITZERLAND. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY. IST NAZL FIS NUCL, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA. UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, USTC, HEFEI 230029, ANHUI, PEOPLES R CHINA. RES INST HIGH ENERGY PHYS, SF-00014 HELSINKI, FINLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. IST NAZL FIS NUCL, SEZ LECCE, I-73100 LECCE, ITALY. UNIV LECCE, I-73100 LECCE, ITALY. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, CNRS, IN2P3, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. IST NAZL FIS NUCL, SEZ MILANO, I-20133 MILAN, ITALY. INST THEORET & EXPTL PHYS, MOSCOW 117259, RUSSIA. IST NAZL FIS NUCL, SEZ NAPOLI, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. IST NAZL FIS NUCL, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. IST NAZL FIS NUCL, SEZ ROMA, I-00185 ROME, ITALY. INST PHYS NUCL, ST PETERSBURG, RUSSIA. UNIV SALERNO, I-84100 SALERNO, ITALY. IST NAZL FIS NUCL, I-84100 SALERNO, ITALY. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO DE COMPOSTELA, SPAIN. BULGARIAN ACAD SCI, CENT LAB MECHATRON & INSTRUMENTAT, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. UNIV UTRECHT, 3584 CB UTRECHT, NETHERLANDS. NIKHEF, 3584 CB UTRECHT, NETHERLANDS. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, D-15738 ZEUTHEN, GERMANY. ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. RP Acciarri, M (reprint author), RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY. RI Sanchez, Eusebio/H-5228-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Roth, Stefan/J-2757-2016; Kamyshkov, Yuri/J-7999-2016; Fiandrini, Emanuele/C-4549-2008; Cerrada, Marcos/J-6934-2014; de la Cruz, Begona/K-7552-2014; Josa, Isabel/K-5184-2014; Berdugo, Javier/A-2858-2015; D'Alessandro, Raffaello/F-5897-2015; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012; alpat, ali behcet/G-6290-2013; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012 OI Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; Kamyshkov, Yuri/0000-0002-3789-7152; Cerrada, Marcos/0000-0003-0112-1691; Berdugo, Javier/0000-0002-7911-8532; D'Alessandro, Raffaello/0000-0001-7997-0306; Ludovici, Lucio/0000-0003-1970-9960; Kirkby, Jasper/0000-0003-2341-9069; Servoli, Leonello/0000-0003-1725-9185; alpat, ali behcet/0000-0002-0116-1506; NR 29 TC 10 Z9 10 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. 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B PD MAY 9 PY 1996 VL 374 IS 4 BP 331 EP 340 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UM345 UT WOS:A1996UM34500008 ER PT J AU Abreu, P Adam, W Adye, T Agasi, E Ajinenko, I Aleksan, R Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, ML Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, A Bambade, P Barao, F Barate, R Barbi, M Bardin, DY Baroncelli, A Barring, O Barrio, JA Bartl, W Bates, MJ Battaglia, M Baubillier, M Baudot, J Becks, KH Begalli, M Beilliere, P Belokopytov, Y Benvenuti, AC Berggren, M Bertrand, D Bianchi, F Bigi, M Bilenky, MS Billoir, P Bloch, D Blume, M Blyth, S Bolognese, T Bonesini, M Bonivento, W Booth, PSL Borisov, G Bosio, C Bosworth, S Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Bozzo, M Branchini, P Brand, KD Brenke, T Brenner, RA Bricman, C Brillault, L Brown, RCA Bruckman, P Brunet, JM Bugge, L Buran, T Burgsmueller, T Buschmann, P Buys, A Cabrera, S Caccia, M Calvi, M Rozas, AJC Camporesi, T Canale, V Canepa, M Cankocak, K Cao, F Carena, F Carroll, L Caso, C Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Chabaud, V Chapkin, M Charpentier, P Chaussard, L Chauveau, J Checchia, P Chelkov, GA Chen, M Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudoba, J Cindro, V Collins, P Contreras, JL Contri, R Cortina, E Cosme, G Cossutti, F Crawley, HB Crennell, D Crosetti, G Maestro, JC Czellar, S DahlJensen, E Dahm, J Dalmagne, B Dam, M Damgaard, G Dauncey, PD Davenport, M DaSilva, W Defoix, C Deghorain, A DellaRicca, G Delpierre, P Demaria, N DeAngelis, A DeBoer, W DeBrabandere, S DeClercq, C DeLaVaissiere, C DeLotto, B DeMin, A DePaula, L DeSaintJean, C Dijkstra, H DiCiaccio, L Djama, F Dolbeau, J Donszelmann, M Doroba, K Dracos, M Drees, J Drees, KA Dris, M Dufour, Y Edsall, D Ehret, R Eigen, G Ekelof, T Ekspong, G Elsing, M Engel, JP Ershaidat, N Erzen, B Santo, ME Falk, E Fassouliotis, D Feindt, M Fenyuk, A Ferrer, A Filippas, TA Firestone, A Fischer, PA Foeth, H Fokitis, E Fontanelli, F Formenti, F Franek, B Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R FuldaQuenzer, F Fuster, J Galloni, A Gamba, D Gandelman, M Garcia, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gibbs, M Gokieli, R Golob, B Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Graziani, E Grosdidier, G Grzelak, K Gumenyuk, S Gunnarsson, P Gunther, M Guy, J Hahn, F Hahn, S Hajduk, Z Hallgren, A Hamacher, K Hao, W Harris, FJ Hedberg, V Henriques, R Hernandez, JJ Herquet, P Herr, H Hessing, TL Higon, E Hilke, HJ Hill, TS Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Hrubec, J Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P JeanMarie, B Johansson, EK Jonsson, L Jonsson, P Joram, C Juillot, P Kaiser, M Kapusta, F Karafasoulis, K Karlsson, M Karvelas, E Katsanevas, S Katsoufis, EC Keranen, R Khokhlov, Y Khomenko, BA Khovanski, NN King, B Kjaer, NJ Klein, H Klovning, A Kluit, P Koene, B Kokkinias, P Koratzinos, M Korcyl, K Kourkoumelis, C Kouznetsov, O Kramer, PH Kreuter, C Kronkvist, I Krumstein, Z Krupinski, W Kubinec, P Kucewicz, W Kurvinen, K Lacasta, C Laktineh, I Lamblot, S Lamsa, JW Lanceri, L Lane, DW Langefeld, P Last, I Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Legan, CK Leitner, R Lemoigne, Y Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Liko, D Lindner, R Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J Maehlum, G Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Maron, T MartinezRivero, C MartinezVidal, F Garcia, SMI Masik, J Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R McNulty, R Medbo, J Merk, M Meroni, C Meyer, S Meyer, WT Michelotto, M Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Mundim, LM Murray, WJ Muryn, B Myatt, G Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Neumann, W Neumeister, N Nicolaidou, R Nielsen, BS Nieuwenhuizen, M Nikolaenko, V Niss, P Nomerotski, A Normand, A Novak, M OberschulteBeckmann, W Obraztsov, V Olshevski, AG Orava, R Osterberg, K Ouraou, A Paganini, P Paganoni, M Pages, P Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Passeri, A Pegoraro, M Peralta, L Pernegger, H Pernicka, M Perrotta, A Petridou, C Petrolini, A Petrovyck, M Phillips, HT Piana, G Pierre, F Pimenta, M Pindo, M Plaszczynski, S Podobrin, O Pol, ME Polok, G Poropat, P Pozdniakov, V Prest, M Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Ratoff, PN Read, AL Reale, M Rebecchi, P Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, J Ridky, J Rinaudo, G Ripp, I Romero, A Roncagliolo, I Ronchese, P Roos, L Rosenberg, EI Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W RuhlmannKleider, V Ruiz, A Rybicki, K Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sanchez, J Sannino, M Schimmelpfennig, M Schneider, H Schwickerath, U Schyns, MAE Sciolla, G Scuri, F Seager, P Sedykh, Y Segar, AM Seitz, A Sekulin, R Shellard, RC Siccama, I Siegrist, P Simonetti, S Simonetto, F Sisakian, AN Sitar, B Skaali, TB Smadja, G Smirnov, N Smirnova, O Smith, GR Solovianov, O Sosnowski, R SouzaSantos, D Spassov, T Spiriti, E Sponholz, P Squarcia, S Stanescu, C Stapnes, S Stavitski, I Stichelbaut, F Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Tavernet, JP Tchikilev, O Tilquin, A Timmermans, J Tkatchev, LG Todorov, T Toet, DZ Tomaradze, A Tome, B Tonazzo, A Tortora, L Transtromer, G Treille, D Trischuk, W Tristram, G Trombini, A Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tyndel, M Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E VanderVelde, C VanApeldoorn, GW VanDam, P VanDoninck, WK VanEldik, J Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Vilanova, D Vincent, P Vitale, L Vlasov, E Vodopyanov, AS Vrba, V Wahlen, H Walck, C Waldner, F Weierstall, M Weilhammer, P Weiser, C Wetherell, AM Wicke, D Wickens, JH Wielers, M Wilkinson, GR Williams, WSC Winter, M Witek, M Woschnagg, K Yip, K Yushchenko, O Zach, F Zaitsev, A Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zito, M Zontar, D Zuberi, R Zucchelli, GC Zumerle, G AF Abreu, P Adam, W Adye, T Agasi, E Ajinenko, I Aleksan, R Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, ML Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, A Bambade, P Barao, F Barate, R Barbi, M Bardin, DY Baroncelli, A Barring, O Barrio, JA Bartl, W Bates, MJ Battaglia, M Baubillier, M Baudot, J Becks, KH Begalli, M Beilliere, P Belokopytov, Y Benvenuti, AC Berggren, M Bertrand, D Bianchi, F Bigi, M Bilenky, MS Billoir, P Bloch, D Blume, M Blyth, S Bolognese, T Bonesini, M Bonivento, W Booth, PSL Borisov, G Bosio, C Bosworth, S Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Bozzo, M Branchini, P Brand, KD Brenke, T Brenner, RA Bricman, C Brillault, L Brown, RCA Bruckman, P Brunet, JM Bugge, L Buran, T Burgsmueller, T Buschmann, P Buys, A Cabrera, S Caccia, M Calvi, M Rozas, AJC Camporesi, T Canale, V Canepa, M Cankocak, K Cao, F Carena, F Carroll, L Caso, C Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Chabaud, V Chapkin, M Charpentier, P Chaussard, L Chauveau, J Checchia, P Chelkov, GA Chen, M Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudoba, J Cindro, V Collins, P Contreras, JL Contri, R Cortina, E Cosme, G Cossutti, F Crawley, HB Crennell, D Crosetti, G Maestro, JC Czellar, S DahlJensen, E Dahm, J Dalmagne, B Dam, M Damgaard, G Dauncey, PD Davenport, M DaSilva, W Defoix, C Deghorain, A DellaRicca, G Delpierre, P Demaria, N DeAngelis, A DeBoer, W DeBrabandere, S DeClercq, C DeLaVaissiere, C DeLotto, B DeMin, A DePaula, L DeSaintJean, C Dijkstra, H DiCiaccio, L Djama, F Dolbeau, J Donszelmann, M Doroba, K Dracos, M Drees, J Drees, KA Dris, M Dufour, Y Edsall, D Ehret, R Eigen, G Ekelof, T Ekspong, G Elsing, M Engel, JP Ershaidat, N Erzen, B Santo, ME Falk, E Fassouliotis, D Feindt, M Fenyuk, A Ferrer, A Filippas, TA Firestone, A Fischer, PA Foeth, H Fokitis, E Fontanelli, F Formenti, F Franek, B Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R FuldaQuenzer, F Fuster, J Galloni, A Gamba, D Gandelman, M Garcia, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gibbs, M Gokieli, R Golob, B Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Graziani, E Grosdidier, G Grzelak, K Gumenyuk, S Gunnarsson, P Gunther, M Guy, J Hahn, F Hahn, S Hajduk, Z Hallgren, A Hamacher, K Hao, W Harris, FJ Hedberg, V Henriques, R Hernandez, JJ Herquet, P Herr, H Hessing, TL Higon, E Hilke, HJ Hill, TS Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Hrubec, J Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P JeanMarie, B Johansson, EK Jonsson, L Jonsson, P Joram, C Juillot, P Kaiser, M Kapusta, F Karafasoulis, K Karlsson, M Karvelas, E Katsanevas, S Katsoufis, EC Keranen, R Khokhlov, Y Khomenko, BA Khovanski, NN King, B Kjaer, NJ Klein, H Klovning, A Kluit, P Koene, B Kokkinias, P Koratzinos, M Korcyl, K Kourkoumelis, C Kouznetsov, O Kramer, PH Kreuter, C Kronkvist, I Krumstein, Z Krupinski, W Kubinec, P Kucewicz, W Kurvinen, K Lacasta, C Laktineh, I Lamblot, S Lamsa, JW Lanceri, L Lane, DW Langefeld, P Last, I Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Legan, CK Leitner, R Lemoigne, Y Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Liko, D Lindner, R Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J Maehlum, G Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Maron, T MartinezRivero, C MartinezVidal, F Garcia, SMI Masik, J Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R McNulty, R Medbo, J Merk, M Meroni, C Meyer, S Meyer, WT Michelotto, M Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Mundim, LM Murray, WJ Muryn, B Myatt, G Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Neumann, W Neumeister, N Nicolaidou, R Nielsen, BS Nieuwenhuizen, M Nikolaenko, V Niss, P Nomerotski, A Normand, A Novak, M OberschulteBeckmann, W Obraztsov, V Olshevski, AG Orava, R Osterberg, K Ouraou, A Paganini, P Paganoni, M Pages, P Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Passeri, A Pegoraro, M Peralta, L Pernegger, H Pernicka, M Perrotta, A Petridou, C Petrolini, A Petrovyck, M Phillips, HT Piana, G Pierre, F Pimenta, M Pindo, M Plaszczynski, S Podobrin, O Pol, ME Polok, G Poropat, P Pozdniakov, V Prest, M Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Ratoff, PN Read, AL Reale, M Rebecchi, P Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, J Ridky, J Rinaudo, G Ripp, I Romero, A Roncagliolo, I Ronchese, P Roos, L Rosenberg, EI Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W RuhlmannKleider, V Ruiz, A Rybicki, K Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sanchez, J Sannino, M Schimmelpfennig, M Schneider, H Schwickerath, U Schyns, MAE Sciolla, G Scuri, F Seager, P Sedykh, Y Segar, AM Seitz, A Sekulin, R Shellard, RC Siccama, I Siegrist, P Simonetti, S Simonetto, F Sisakian, AN Sitar, B Skaali, TB Smadja, G Smirnov, N Smirnova, O Smith, GR Solovianov, O Sosnowski, R SouzaSantos, D Spassov, T Spiriti, E Sponholz, P Squarcia, S Stanescu, C Stapnes, S Stavitski, I Stichelbaut, F Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Tavernet, JP Tchikilev, O Tilquin, A Timmermans, J Tkatchev, LG Todorov, T Toet, DZ Tomaradze, A Tome, B Tonazzo, A Tortora, L Transtromer, G Treille, D Trischuk, W Tristram, G Trombini, A Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tyndel, M Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E VanderVelde, C VanApeldoorn, GW VanDam, P VanDoninck, WK VanEldik, J Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Vilanova, D Vincent, P Vitale, L Vlasov, E Vodopyanov, AS Vrba, V Wahlen, H Walck, C Waldner, F Weierstall, M Weilhammer, P Weiser, C Wetherell, AM Wicke, D Wickens, JH Wielers, M Wilkinson, GR Williams, WSC Winter, M Witek, M Woschnagg, K Yip, K Yushchenko, O Zach, F Zaitsev, A Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zito, M Zontar, D Zuberi, R Zucchelli, GC Zumerle, G TI Search for exclusive decays of the Lambda(b) baryon and measurement of its mass SO PHYSICS LETTERS B LA English DT Article AB A search for fully reconstructed Lambda(b)(0) beauty baryons is performed using about 3 million Z decays collected with the DELPHI detector at LEP. The analysis relies on the combined use of the accurate tracking and of the hadron identification capabilities of DELPHI. A total of four events has been found, three in the Lambda(c)(+)pi(-) channel and one in the Lambda(c)(+)a(1)(-) channel over a small background. The Lambda(b)(0) beauty baryon mass is measured to be (5668 +/- 16 (stat.) +/-8 (syst.)) MeV/c(2). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VUB,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,SK-84215 BRATISLAVA,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV STRASBOURG 1,CTR RECH NUCL,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. ACAD SCI CZECH REPUBL,INST PHYS,DIV HIGH ENERGY PHYS,FZU,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 ST MARTIN DHERES,FRANCE. RES INST HIGH ENERGY PHYS,FIN-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,PL-30055 KRAKOW,POLAND. UNIV MIN & MET KRAKOW,PL-30055 KRAKOW,POLAND. UNIV PARIS 11,LAB ACCELERATEUR LINEAIRE,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22362 LUND,SWEDEN. UNIV LYON 1,CNRS,IPNL,IN2P3,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,NC,AREA MFF,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,INST FIS CANTABRIA,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,MOSCOW REG,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,SI-61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,SI-61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,FYKIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,VALENCIA,SPAIN. VALENCIA CSIC,IFIC,E-46100 BURJASSOT,VALENCIA,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP Abreu, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Barao, Fernando/O-2357-2016; Navas, Sergio/N-4649-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Cabrera Urban, Susana/H-1376-2015; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Botner, Olga/A-9110-2013; Hallgren, Allan/A-8963-2013; Mundim, Luiz/A-1291-2012; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Chudoba, Jiri/G-7737-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Michelotto, Michele/A-9571-2013; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; De Saint Jean, Cyrille/E-8853-2011 OI Barao, Fernando/0000-0002-8346-9941; Navas, Sergio/0000-0003-1688-5758; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Ragazzi, Stefano/0000-0001-8219-2074; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Mundim, Luiz/0000-0001-9964-7805; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Michelotto, Michele/0000-0001-6644-987X; Ruiz, Alberto/0000-0002-3639-0368; NR 19 TC 28 Z9 28 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 9 PY 1996 VL 374 IS 4 BP 351 EP 361 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UM345 UT WOS:A1996UM34500010 ER PT J AU Xie, XB McCarley, RE AF Xie, XB McCarley, RE TI The first hexanuclear tungsten telluride clusters [W(6)Te(8)L(6)](n-) as amine complexes with L equals piperidine (n=0) and L equals pyridine (n=1) SO INORGANIC CHEMISTRY LA English DT Article ID SUPERCONDUCTING CHEVREL PHASES; MOLECULAR-MODEL; HYDRODESULFURIZATION C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 21 TC 22 Z9 22 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 8 PY 1996 VL 35 IS 10 BP 2713 EP 2714 DI 10.1021/ic951656+ PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA UK293 UT WOS:A1996UK29300003 ER PT J AU Allen, PG Veirs, DK Conradson, SD Smith, CA Marsh, SF AF Allen, PG Veirs, DK Conradson, SD Smith, CA Marsh, SF TI Characterization of aqueous plutonium(IV) nitrate complexes by extended x-ray absorption fine structure spectroscopy SO INORGANIC CHEMISTRY LA English DT Article ID ACTINIDE AB The structures of the aqueous nitrate complexes of Pu(IV) have been studied by extended X-ray absorption finestructure (EXAFS) at nitric acid concentrations of 3, 8, and 13 M. Systematic changes in the EXAFS spectra demonstrate the trends of increasing nitrate ligation and decreasing water ligation as a function of increasing nitric acid concentration. The coordination numbers of the nitrogens and noncoordinating oxygens are consistent with previous studies in which the principal species were found to be the di-, tetra-, and hexanitrato complexes in these solutions, The Pu(TV) nitrate complexes in nitric acid appear to have similar actinide-nitrate structures as seen in the solid state structures of analogous thorium and neptunium nitrate compounds in which the nitrate ligands are planar and bidentate, and the central actinide atom is in the plane of the nitrates. The nitrates are distorted with respect to free nitrate in that the nitrogen-oxygen bond length of the noncoordinating oxygen is significantly shorter than the nitrogen-oxygen bond lengths of the coordinated oxygens. The plutonium in these complexes is highly coordinated with coordination numbers of 11-12 for the first shell of oxygen nearest neighbors. The average plutonium-oxygen (nitrate) bond length is 2.49 Angstrom, and the average plutonium-oxygen (water) bond length is estimated to be 2.38 Angstrom. C1 LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. LAWRENCE LIVERMORE NATL LAB,GLENN T SEABORG INST TRANSACTINIUM SCI,LIVERMORE,CA 94551. NR 24 TC 51 Z9 51 U1 2 U2 34 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 8 PY 1996 VL 35 IS 10 BP 2841 EP 2845 DI 10.1021/ic9511231 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA UK293 UT WOS:A1996UK29300025 ER PT J AU Pak, YS Woods, RC Peterson, KA AF Pak, YS Woods, RC Peterson, KA TI A coupled cluster study of the spectroscopic properties and electric dipole moment functions of nitrous sulfide SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CORRELATED MOLECULAR CALCULATIONS; RO-VIBRATIONAL SPECTRA; GAUSSIAN-BASIS SETS; DINITROGEN SULFIDE; INFRARED-SPECTRUM; CARBONYL SULFIDE; N2S; PROGRAMS; ARGON AB Three-dimensional near-equilibrium potential energy surfaces and dipole moment functions have been calculated for the ground state of nitrous sulfide (NNS), using a large basis set and the coupled cluster method with single and double substitutions, augmented by a perturbative estimate of triple excitations [CCSD(T)]. The CCSD(T) equilibrium bond lengths with a correlation consistent polarized valence quadruple zeta (cc-pVQZ) basis set are r(e)(NN)=1.1284 Angstrom and R(e)(NS)=1.5904 Angstrom, which have been corrected to 1.126 and 1.581 Angstrom, respectively, based on the results of the corresponding calculations on the NN and NS diatomics. Rotational-vibrational energy levels and the corresponding infrared intensities for NNS have been determined using variational methods with the CCSD(T)/cc-pVQZ potential energy and dipole moment functions. The calculated band origins (cm(-1)) nu(1), nu(2), and nu(3) and their intensities (km/mol) at the CCSD(T)/cc-pVQZ level are 740.7/38.6, 463.1/0.01, and 2061.4/385.8, respectively. A complete set of second-order spectroscopic constants have been obtained from the ab initio potential energy surface using both the standard perturbation theory formulas and the variationally determined rovibrational energies. Comparison of the theoretical vibration-rotation interaction constants (alpha(i)) with those obtained from the published high resolution Fourier transform infrared (FTIR) spectra clearly demonstrate that the rotational quantum number (J) assignments must be revised in al the observed hot bands. A new set of spectroscopic constants for NNS, derived from a reanalysis of the published FTIR frequencies, is presented. These are in excellent agreement with our CCSD(T) predictions. Values of the quadrupole coupling constants at each nucleus are predicted using multireference configuration interaction (MRCI) with the same cc-pVQZ basis. (C) 1996 American Institute of Physics. C1 WASHINGTON STATE UNIV, DEPT CHEM, RICHLAND, WA USA. PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. RP Pak, YS (reprint author), UNIV WISCONSIN, DEPT CHEM, MADISON, WI 53706 USA. NR 35 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 8 PY 1996 VL 104 IS 18 BP 7073 EP 7080 DI 10.1063/1.471425 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UJ114 UT WOS:A1996UJ11400019 ER PT J AU Gray, SK Manolopoulos, DE AF Gray, SK Manolopoulos, DE TI Symplectic integrators tailored to the time-dependent Schrodinger equation SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID QUANTUM-MECHANICS; SEMICLASSICAL IMPLICATIONS; HAMILTONIAN-FORMULATION; MOLECULAR-DYNAMICS; SCATTERING; RESONANCES; EVOLUTION AB We discuss and illustrate how symplectic integrators can be tailored to solve the time-dependent Schrodinger equation, yielding a large new family of wave packet propagation methods. These methods are interesting because of their algorithmic simplicity and minimal storage requirements. A variety of such methods are obtained. Calculations and comparisons with various other methods are presented for a one-dimensional Morse oscillator and a three-dimensional unimolecular dissociation problem. (C) 1996 American Institute of Physics. C1 UNIV NOTTINGHAM,DEPT CHEM,NOTTINGHAM NG7 2RD,ENGLAND. RP Gray, SK (reprint author), ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439, USA. NR 51 TC 106 Z9 109 U1 3 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 8 PY 1996 VL 104 IS 18 BP 7099 EP 7112 DI 10.1063/1.471428 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UJ114 UT WOS:A1996UJ11400022 ER PT J AU Perng, BC Newton, MD Raineri, FO Friedman, HL AF Perng, BC Newton, MD Raineri, FO Friedman, HL TI Energetics of charge transfer reactions in solvents of dipolar and higher order multipolar character .1. Theory SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID ELECTRON-TRANSFER REACTIONS; TIME-DEPENDENT FLUORESCENCE; MONTE-CARLO SIMULATION; POLAR-SOLVENTS; POLARIZABLE FLUIDS; ENERGY-GAP; NONEQUILIBRIUM SOLVATION; REORGANIZATION ENERGY; COMPUTER-SIMULATION; MOLECULAR-DYNAMICS AB We extend a recent molecular theory of solvation dynamics to accommodate static solvent effects on the energetics of charge transfer (CT) processes. Our theory is based on a simple renormalized linear response development which incorporates nonlinear aspects of equilibrium solvation. It can accommodate polarizable solvent molecules as well as the limiting case represented by electronically rigid interaction site model (ISM) solvent molecules. We focus on the diabatic free energy profiles governing CT processes in solute donor-acceptor systems of chemical interest. By studying CT in ISM solution models we naturally cover both the short range and long range solute-solvent interactions, thereby enabling applications to CT in solvents of higher multipolar as well as dipolar character. We derive expressions for the key energetic parameters of a CT process; the solvent reorganization energy, the solvent contribution to the change in thermodynamic free energy, and the optical absorption and fluorescence frequencies. (C) 1996 American Institute of Physics. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP Perng, BC (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 111 TC 89 Z9 89 U1 0 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 8 PY 1996 VL 104 IS 18 BP 7153 EP 7176 DI 10.1063/1.471431 PG 24 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UJ114 UT WOS:A1996UJ11400026 ER PT J AU Perng, BC Newton, MD Raineri, FO Friedman, HL AF Perng, BC Newton, MD Raineri, FO Friedman, HL TI Energetics of charge transfer reactions in solvents of dipolar and higher order multipolar character .2. Results SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MONTE-CARLO SIMULATIONS; OPLS POTENTIAL FUNCTIONS; FREE-ENERGY CALCULATIONS; EXTENDED RISM EQUATION; ELECTRON-TRANSFER; MOLECULAR FLUIDS; SUBSTITUTED BENZENES; ION-PAIR; MODEL; SOLVATION AB We apply the theories developed in the preceding paper (paper I) to calculate various energy quantities of charge transfer (CT) reactions in nine solvents that cover a wide range of polarity, and for which interaction site models (ISM's) may be found in the Literature. Besides the two surrogate Hamiltonian theories developed in paper I, the renormalized site-density theory (RST) and the renormalized dielectric theory (RDT), we also investigate a simple harmonic approximation (HXA) for the diabatic free energy profiles, whose characteristic parameters are calculated taking specific advantage of the expression given by the extended reference interaction site method (XRISM) for the free energy of solvation. For each CT process we analyze (a) the solvent reorganization energy lambda, (b) the shift of the absorption transition energy due to the solvatochromic effect, and (c) the solvent contribution to the free energy change Delta A. In addition, for a few selected examples, we also report the detailed diabatic free energy profiles. The calculations reported rely on solute-solvent and solvent-solvent pair correlation functions obtained with the XRISM integral equation method applied to nonpolarizable (with fixed mean partial charges) ISM representations of the solute and solvent molecules. To rectify the omission of the solvent electronic degrees of freedom, we correct the dielectric part of the solvent reorganization energy with an additive term designed to compensate for the use of fixed charge ISM models. Contact with theories in which the solvent is represented as a dielectric continuum medium (with or without spatial dispersion) and the solute as a set of charges inside spherical cavities carved out of the dielectric is made straightforwardly within the RDT theory by considering a particularly simple form of the solute-solvent RISM site-site direct correlation functions. Using simple ISM models for several solute species, including Reichardt's betaine-30 dye and a porphyrin-quinone (PQ) ''dyad'' recently studied by Mataga and co-workers, we examine the ability of the molecular theories to explain the dependence of charge-transfer energetics on dipolar and nondipolar solvents, We find that the solvatochromic effect on the absorption energy of betaine-30, which forms the basis of the E(T)(30) empirical solvent polarity scale, is reproduced reasonably well by the RST, RDT, and HXA theories for solvents ranging from carbon tetrachloride to water. In the case of the PQ dyad, we find that the calculated values of lambda in dipolar and nondipolar solvents are in good agreement with experimental estimates. Our results indicate that the molecular theories of solvation discussed in this paper can explain the observation that a solvent with vanishing molecular dipole moment, like benzene, can show unmistakable ''polarity,'' as reflected by its influence on the energetics of CT reactions. We also present calculations that corroborate the suggestion (Sec, VII of paper I) that, compared with the behavior in dipolar solvents, in nonipolar solvents the dependence of lambda with the donor-acceptor separation distance is practically negligible. (C) 1996 American Institute of Physics. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP Perng, BC (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 72 TC 84 Z9 84 U1 0 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 8 PY 1996 VL 104 IS 18 BP 7177 EP 7204 DI 10.1063/1.471432 PG 28 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UJ114 UT WOS:A1996UJ11400027 ER PT J AU Vonck, J AF Vonck, J TI A three-dimensional difference map of the N intermediate in the bacteriorhodopsin photocycle: Part of the F helix tilts in the M to N transition SO BIOCHEMISTRY LA English DT Article ID ELECTRON-DIFFRACTION PATTERNS; DRIVEN PROTON PUMP; X-RAY-DIFFRACTION; SCHIFF-BASE; VIBRATIONAL SPECTROSCOPY; MUTANT TYR-185->PHE; STRUCTURAL-CHANGES; CONFORMATIONAL CHANGE; ASPARTIC ACID-96; ROOM-TEMPERATURE AB The N intermediate of the bacteriorhodopsin photocycle was trapped for electron diffraction studies in glucose-embedded specimens of the site-directed mutant Phe219-->Leu. At neutral pH, the N-bR difference Fourier transform infrared spectrum of this mutant is indistinguishable from published difference spectra obtained for wild-type bacteriorhodopsin at alkaline pH. An electron diffraction difference map of the N intermediate in projection shows large differences near the F and the G helix, which are very similar to the features seen in the M intermediates of the Asp96-->Gly mutant [Subramaniam et al, (1993) EMBO J. 12, 1-8]. This similarity was anticipated on the basis of Fourier transform infrared data, which have shown that the M intermediate trapped in Asp96 mutants already has the protein structure of the N intermediate [Sasaki et al. (1992) J. Biol. Chem. 267, 20782-20786]. A preliminary three-dimensional difference map of the N intermediate, calculated from electron diffraction data of samples tilted at 25 degrees, clearly shows that the change on the F helix consists of an outward movement of the cytoplasmic end of the helix. In addition, the cytoplasmic side of the G helix moves or becomes more ordered, Comparison with published difference maps of the M intermediate indicates that the F helix tilt occurs in the M to N transition, but the G helix change represents an earlier step in the photocycle. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DONNER LAB,DIV LIFE SCI,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM51487] NR 59 TC 109 Z9 110 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 7 PY 1996 VL 35 IS 18 BP 5870 EP 5878 DI 10.1021/bi952663c PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UK015 UT WOS:A1996UK01500031 PM 8639548 ER PT J AU Bartlett, N Chambers, RD Roche, AJ Spinks, RCH Chacon, L Whalen, JM AF Bartlett, N Chambers, RD Roche, AJ Spinks, RCH Chacon, L Whalen, JM TI New fluorination of organic compounds using thermodynamically unstable nickel fluorides SO CHEMICAL COMMUNICATIONS LA English DT Article ID FREE-RADICAL CHEMISTRY; ETHERS AB Replacement of hydrogen by fluorine in a variety of organic compounds is accomplished with high efficiency in liquid hydrogen fluoride (aHF), at or below 20 degrees C, using the thermodynamically unstable fluorides RNiF(3) and NiF4, the latter prepared in situ from K2NiF6 with BF3. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP Bartlett, N (reprint author), UNIV DURHAM,SCI LABS,DEPT CHEM,SOUTH RD,DURHAM DH1 3LE,ENGLAND. NR 13 TC 13 Z9 13 U1 1 U2 5 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 1359-7345 J9 CHEM COMMUN JI Chem. Commun. PD MAY 7 PY 1996 IS 9 BP 1049 EP 1050 DI 10.1039/cc9960001049 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA UL466 UT WOS:A1996UL46600024 ER PT J AU Seager, CH McIntyre, DC Warren, WL Tuttle, BA AF Seager, CH McIntyre, DC Warren, WL Tuttle, BA TI Charge trapping and device behavior in ferroelectric memories SO APPLIED PHYSICS LETTERS LA English DT Article AB The electric field emanating from the surface of a poled ferroelectric (FE) can control the conduction properties of an overlying semiconducting (SC) film; this combination of materials can thus serve as a nondestructive readout (NDRO), nonvolatile memory device. We have characterized prototypes of these devices which utilize semiconducting In2O3 deposited on thin film lead zirconate titanate and bulk BaTiO3 FEs. The remanent state SC resistance in thin film FE NDRO devices is often opposite to that predicted from the known direction of FE polarization. In these cases charge injected from the SC him into the FE and trapped near the interface appears to control the electric field at the SC/FE interface. By contrast, the response of SC films on bulk FEs is largely controlled by just the FE remanent polarization. The measured SC resistance values in the ''up'' and ''down'' polarization states can be fairly accurately predicted by calculating the accumulation and depletion charge densities from the measured carrier concentrations, mobilities, and FE hysteresis behavior. We also observe a correlation between charge trapping in bulk and thin film of NDRO memory devices and the presence or absence of temperature-bias-stress-induced voltage shifts (imprint) of the FE hysteresis curves. We suggest that the presence of near-interfacial traps in the FE controls both imprint and NDRO memory response. (C) 1996 American Institute of Physics. RP Seager, CH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 38 Z9 38 U1 1 U2 15 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 6 PY 1996 VL 68 IS 19 BP 2660 EP 2662 DI 10.1063/1.116273 PG 3 WC Physics, Applied SC Physics GA UJ089 UT WOS:A1996UJ08900020 ER PT J AU Chan, JS Cheung, NW Schloss, L Jones, E Wong, WS Newman, N Liu, X Weber, ER Gassman, A Rubin, MD AF Chan, JS Cheung, NW Schloss, L Jones, E Wong, WS Newman, N Liu, X Weber, ER Gassman, A Rubin, MD TI Thermal annealing characteristics of Si and Mg-implanted GaN thin films SO APPLIED PHYSICS LETTERS LA English DT Article ID DIODES AB In this letter, we report the results of ion implantation of GaN using Si-28 and Mg-24 species. Structural and electrical characterizations of the GaN thin films after thermal annealing show that native defects in the GaN films dominate over implant doping effects. The formation energies of the annealing induced defects are estimated to range from 1.4 to 3.6 eV. A 40 keV 10(14) cm(-2) Mg implant results in the decrease of the free-carrier concentration by three orders of magnitude compared to unimplanted GaN up to an annealing temperature of 690 degrees C. Furthermore, we have observed the correlation between these annealing-induced defects to both improved optical and electrical properties. (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT ELECT ENGN & COMP SCI, BERKELEY, CA 94720 USA. RI Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 NR 20 TC 34 Z9 35 U1 0 U2 4 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 MAY 6 PY 1996 VL 68 IS 19 BP 2702 EP 2704 DI 10.1063/1.116314 PG 3 WC Physics, Applied SC Physics GA UJ089 UT WOS:A1996UJ08900034 ER PT J AU McCalmont, JS Sigalas, MM Tuttle, G Ho, KM Soukolis, CM AF McCalmont, JS Sigalas, MM Tuttle, G Ho, KM Soukolis, CM TI A layer-by-layer metallic photonic band-gap structure SO APPLIED PHYSICS LETTERS LA English DT Article ID FREQUENCY-SELECTIVE SURFACES AB A new photonic band-gap structure has been developed using a periodic array of metallic rods. Structures have been designed and built that operate in the 75-110 GHz frequency range. A periodic structure shows a high-pass transmission characteristic, while the addition of a defect to the structure adds a bandpass response. Measured responses show good agreement with theoretical simulations. A defect mode operated in the reflection mode showed a quality factor Q of 461. This new metallic structure is considerably smaller than comparable dielectric photonic band-gap structures, and should be useful for building compact, inexpensive filters with operating frequencies ranging from 1 GHz to 1 THz. (C) 1996 American Institute of Physics. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,US DEPT ENERGY,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,MICROELECTR RES CTR,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN & COMP ENGN,AMES,IA 50011. RI Soukoulis, Costas/A-5295-2008 NR 19 TC 62 Z9 63 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 6 PY 1996 VL 68 IS 19 BP 2759 EP 2761 DI 10.1063/1.115589 PG 3 WC Physics, Applied SC Physics GA UJ089 UT WOS:A1996UJ08900053 ER PT J AU Somorjai, GA AF Somorjai, GA TI The flexible surface: New techniques for molecular level studies of time dependent changes in metal surface structure and adsorbate structure during catalytic reactions SO JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL LA English DT Article; Proceedings Paper CT 8th International Symposium on Relations between Homogeneous and Heterogeneous Catalysis (8th SHHC) CY SEP 10-14, 1995 CL BALATONFURED, HUNGARY SP Hungarian Chem Soc, Hungarian Acad Sci, Chem Sect DE chemisorption; flexible surface; surface structure; metal surface; adsorbate structure ID SINGLE-CRYSTAL SURFACES; SCANNING TUNNELING MICROSCOPE; ETHYLENE HYDROGENATION; INDUCED RECONSTRUCTION; SUBSTRATE RELAXATION; AMMONIA-SYNTHESIS; ETHYLIDYNE; PLATINUM; LEED; CHEMISORPTION AB The new model that emerges from the results of recent surface science studies is one of a dynamic, flexible surface that undergoes rapid adsorbate-induced restructuring on the time scale of chemisorption, or at times, slower restructuring on the time scale of catalytic surface reactions, atom diffusion-controlled faceting, or solid state reactions. Many of the unique chemical properties of the surface can be associated with its ability to restructure rapidly as adsorbate bonds form or break, Surface specific vibrational spectroscopy by sum frequency generation (SFG) and high pressure/high temperature scanning tunneling microscopy (STM) are two independent but complimentary techniques which permit molecular level studies of surfaces under dynamic conditions at high pressures. The application of these techniques allows in situ analysis of reactive surfaces during catalytic conditions. These techniques have been used to study ethylene and propylene hydrogenation on platinum surfaces. The investigations provide definitive evidence for physisorbed intermediates, stagnant chemisorbed species, and an unreconstructed surface during catalysis. The role of carbon-containing overlayers covering the surface during reactions has been identified. A detailed molecular mechanism for these two reactions can be proposed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,DIV SCI MAT,BERKELEY,CA 94720. RP Somorjai, GA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,DEPT CHEM,BERKELEY,CA 94720, USA. NR 46 TC 49 Z9 49 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-1169 J9 J MOL CATAL A-CHEM JI J. Mol. Catal. A-Chem. PD MAY 6 PY 1996 VL 107 IS 1-3 BP 39 EP 53 DI 10.1016/1381-1169(95)00227-8 PG 15 WC Chemistry, Physical SC Chemistry GA UR981 UT WOS:A1996UR98100005 ER PT J AU King, RB Bhattacharyya, NK Smith, HD Wiemers, KD AF King, RB Bhattacharyya, NK Smith, HD Wiemers, KD TI Noble metal-catalyzed homogeneous and heterogeneous processes in treating simulated nuclear waste media with formic acid SO JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL LA English DT Article; Proceedings Paper CT 8th International Symposium on Relations between Homogeneous and Heterogeneous Catalysis (8th SHHC) CY SEP 10-14, 1995 CL BALATONFURED, HUNGARY SP Hungarian Chem Soc, Hungarian Acad Sci, Chem Sect DE nuclear waste; noble metals; rhodium; hydrogen; ammonia; reduction ID GLASS; MELTERS AB Simulants for the Hanford Waste Vitrification Plant feed containing the major non-radioactive components Al, Cd, Fe, Mn, Nd, Ni, Si, Zr, Na, CO32-, NO3-, and NO2- were used to study reactions of formic acid at 90 degrees C catalyzed by the noble metals Ru, Ph, and/or Pd found in significant quantities in uranium fission products. Such reactions were monitored using gas chromatography to analyze the CO2, H-2, NO, and N2O in the gas phase and a microammonia electrode to analyze the NH4+/NH3 in the liquid phase as a function of time. The following reactions have been studied in these systems since they are undesirable side reactions in nuclear waste processing: (1) Decomposition of formic acid to CO2+H-2 is undesirable because of the potential fire and explosion hazard of H-2. Rhodium, which was introduced as soluble RhCl3 . 3H(2)O, was found to be the most active catalyst for H-2 generation from formic acid above similar to 80 degrees C in the presence of nitrite ion. The H-2 production rate has an approximate pseudo first-order dependence on the Ph concentration. (2) Generation of NH3 from the formic acid reduction of nitrate and/or nitrite is undesirable because of a possible explosion hazard from NH4NO3 accumulation in a waste processing plant off-gas system, The Rh-catalyzed reduction of nitrogen-oxygen compounds to ammonia by formic acid was found to exhibit the following features: (a) Nitrate rather than nitrite is the principal source of NH3. (b) Ammonia production occurs at the expense of hydrogen production. (c) Supported rhodium metal catalysts are more active than rhodium in any other form, suggesting that ammonia production involves heterogeneous rather than homogeneous catalysis. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP King, RB (reprint author), UNIV GEORGIA, DEPT CHEM, ATLANTA, GA 30602 USA. NR 20 TC 3 Z9 3 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-1169 J9 J MOL CATAL A-CHEM JI J. Mol. Catal. A-Chem. PD MAY 6 PY 1996 VL 107 IS 1-3 BP 145 EP 152 DI 10.1016/1381-1169(95)00170-0 PG 8 WC Chemistry, Physical SC Chemistry GA UR981 UT WOS:A1996UR98100015 ER PT J AU Pajda, M Ahuja, R Johansson, B Wills, JM Figiel, H Paja, A Eriksson, O AF Pajda, M Ahuja, R Johansson, B Wills, JM Figiel, H Paja, A Eriksson, O TI First-principles calculations of the magnetic properties of YMn2 and its hydrides SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ELECTRONIC-STRUCTURE; HYDROGEN ABSORPTION; BRILLOUIN-ZONE; SPECIAL POINTS; MN AB Self-consistent, general potential, electronic structure calculations have been performed for the Laves phase compound YMn2 and its hydrides YMn2Hx (x = 0.5 and 1.0). The parent material, YMn2, is found to be an itinerant antiferromagnet with a magnetic moment of 2.6 mu(B) per Mn atom whereas for the hydrides an additional ferrimagnetic component appears. This is in good agreement with experiment. The dependence of the calculated atom-projected magnetic moments and hyperfine fields on the Mn-H interaction is analysed. We have also calculated the total energy for three different H positions and established that the lowest energy is found for the experimentally observed position. C1 UPPSALA UNIV,DEPT PHYS,CONDENSED MATTER THEORY GRP,S-75121 UPPSALA,SWEDEN. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87544. RP Pajda, M (reprint author), STANISLAW STASZIC UNIV MIN & MET,FAC PHYS & NUCL TECH,ALICA MICKIEWICZA 30,PL-30059 KRAKOW,POLAND. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 20 TC 14 Z9 14 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAY 6 PY 1996 VL 8 IS 19 BP 3373 EP 3384 DI 10.1088/0953-8984/8/19/012 PG 12 WC Physics, Condensed Matter SC Physics GA UL615 UT WOS:A1996UL61500012 ER PT J AU Myers, WD Swiatecki, WJ AF Myers, WD Swiatecki, WJ TI Nuclear properties according to the Thomas-Fermi model SO NUCLEAR PHYSICS A LA English DT Article DE nuclear masses; Thomas-Fermi; fission barriers; congruence energy; neutron matter ID MASS FORMULA; FISSION-BARRIERS; FINITE TEMPERATURE; CURVATURE ENERGY; DEFORMED-NUCLEI; FORCE AB In order to formulate a statistical model of nuclear properties we combine the Thomas-Fermi assumption of two fermions per h(3) of phase space with an effective interaction between nucleons that contains seven adjustable parameters. After allowing for shell effects, an even-odd correction and a congruence energy (''Wigner Term''), six of the seven parameters were fitted to 1654 ground state masses of nuclei with N, Z greater than or equal to 8, together with a constraint that ensures agreement with measured values of the nuclear surface diffuseness. The RMS deviation in the fit to masses was 0.655 MeV, and the calculated values exhibit no drastic discrepancies even for A = 3. Calculated sizes of nuclear charge distributions agree closely with measurements. Calculated fission barriers were compared with 40 measured values down to Br-75. For Z greater than or equal to 88 the agreement is almost perfect. For Z < 88 the trend of the measurements seems to confirm the expectation that the congruence energy should double its magnitude for strongly necked-in saddle-point shapes. A seventh (density-dependence) parameter in the effective interaction can be adjusted to ensure fair agreement with the measured energy-dependence of the optical model potential in the range from -70 MeV to 180 MeV. The model is used to predict properties of nuclear and neutron matter (including their compressibilities). A table of some 9000 calculated ground state masses of nuclei up to Z = 135 has been prepared. RP Myers, WD (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 53 TC 488 Z9 492 U1 1 U2 12 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 MAY 6 PY 1996 VL 601 IS 2 BP 141 EP 167 DI 10.1016/0375-9474(95)00509-9 PG 27 WC Physics, Nuclear SC Physics GA UN295 UT WOS:A1996UN29500002 ER PT J AU Dimopoulos, S Dine, M Raby, S Thomas, S AF Dimopoulos, S Dine, M Raby, S Thomas, S TI Experimental signatures of low energy gauge-mediated supersymmetry breaking SO PHYSICAL REVIEW LETTERS LA English DT Article ID TECHNICOLOR AB The experimental signatures for low energy gauge-mediated supersymmetry breaking are distinctive since the gravitino is naturally the lightest supersymmetric particle. The nest lightest supersymmetric particle (NLSP) can be a gaugino, Higgsino, or right handed slepton. For a significant range of parameters, decay of the NLSP to its partner plus the gravitino can he measured as a displaced vertex or kink in a charged particle track. In the case that the NLSP is mostly gaugino, we identify the discovery modes as e(+)e(-) --> gamma gamma + is not an element of, and <(p)over bar p> --> l(+)l(-)gamma gamma + is not an element of(T). If the NLSP is a right-handed slepton, the discovery modes are e(+)e(-) --> l(+)l(-) + is not an element of and <(p)over bar p> --> l(+)l(-) + is not an element of(T). A NLSP which is mostly Higgsino is also considered. C1 CERN,DIV THEORET PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP Dimopoulos, S (reprint author), STANFORD UNIV,DEPT PHYS,STANFORD,CA 94309, USA. NR 30 TC 256 Z9 256 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 MAY 6 PY 1996 VL 76 IS 19 BP 3494 EP 3497 DI 10.1103/PhysRevLett.76.3494 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000007 ER PT J AU Ambrosanio, S Kane, GL Kribs, GD Martin, SP Mrenna, S AF Ambrosanio, S Kane, GL Kribs, GD Martin, SP Mrenna, S TI Supersymmetric analysis and predictions based on the Collider Detector at Fermilab ee gamma gamma plus missing energy event SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERLIGHT GRAVITINO; E+E ANNIHILATION; DECAY; NEUTRALINO; COLLISIONS; PHYSICS; SEARCH; MODEL; MASS AB We have analyzed the Collider Detector at Fermilab ee gamma gamma + missing energy event. Its kinematics and expected rate are consistent with selectron pair production. We consider two classes of general low-energy supersymmetric theories where the lightest neutralino or the gravitino is the lightest supersymmetric particle. The supersymmetric Lagrangian is tightly constrained by the production and decay of the selectron and other data. We discuss other processes at the Fermilab Tevatron and at LEP that could confirm or exclude a supersymmetric explanation of the event. C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP Ambrosanio, S (reprint author), UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. NR 27 TC 160 Z9 160 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 MAY 6 PY 1996 VL 76 IS 19 BP 3498 EP 3501 DI 10.1103/PhysRevLett.76.3498 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000008 ER PT J AU Albrecht, R Antonenko, V Awes, TC Barlag, C Berger, F Bloomer, M Blume, C Bock, D Bock, R Bohne, EM Bucher, D Claesson, G Claussen, A Clewing, G Debbe, R Dragon, L Dubovik, Y Eklund, A Fokin, S Franz, A Garpman, S Glasow, R Gustafsson, HA Gutbrod, HH Hansen, O Holker, G Idh, J Ippolitov, M Jacobs, P Kampert, KH Karadjev, K Kolb, BW Lebedev, A Lohner, H Lund, I Manko, V Moskowitz, B Nikolaev, S Nystrand, J Obenshain, FE Oskarsson, A Otterlund, I Peitzmann, T Plasil, F Poskanzer, AM Purschke, M Ritter, HG Roters, B Saini, S Santo, R Schlagheck, H Schmidt, HR Soderstrom, K Sorensen, SP Stankus, PW Steffens, K Steinhaeuser, P Stenlund, E Stuken, D Vinogradov, A Wegner, H Young, GR AF Albrecht, R Antonenko, V Awes, TC Barlag, C Berger, F Bloomer, M Blume, C Bock, D Bock, R Bohne, EM Bucher, D Claesson, G Claussen, A Clewing, G Debbe, R Dragon, L Dubovik, Y Eklund, A Fokin, S Franz, A Garpman, S Glasow, R Gustafsson, HA Gutbrod, HH Hansen, O Holker, G Idh, J Ippolitov, M Jacobs, P Kampert, KH Karadjev, K Kolb, BW Lebedev, A Lohner, H Lund, I Manko, V Moskowitz, B Nikolaev, S Nystrand, J Obenshain, FE Oskarsson, A Otterlund, I Peitzmann, T Plasil, F Poskanzer, AM Purschke, M Ritter, HG Roters, B Saini, S Santo, R Schlagheck, H Schmidt, HR Soderstrom, K Sorensen, SP Stankus, PW Steffens, K Steinhaeuser, P Stenlund, E Stuken, D Vinogradov, A Wegner, H Young, GR TI Limits on the production of direct photons in 200A GeV S-32+Au collisions SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEAR COLLISIONS AB A search for the production of direct photons in S + An collisions at 200A GeV has been carried out in the CERN-WA80 experiment. For central collisions the measured photon excess at each pr, averaged over the range 0.5 less than or equal to p(T) less than or equal to less than or equal to 2.5 GeV/c, corresponded to 5.0% of the total inclusive photon yield with a statistical error of sigma(stat) = 0.8% and a systematic error of sigma(syst) = 5.8%. Upper limits on the invariant yield for direct photon production at the 90% C.L. are presented. Possible implications for the dynamics of high-energy heavy-ion collisions are discussed. C1 IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,RUSSIA. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV MUNSTER,D-48149 MUNSTER,GERMANY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LUND UNIV,S-22362 LUND,SWEDEN. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV TENNESSEE,KNOXVILLE,TN 37996. UNIV GRONINGEN,KERNFYS VERSNELLER INST,NL-9747 AA GRONINGEN,NETHERLANDS. RP Albrecht, R (reprint author), GESELL SCHWERIONENFORSCH MBH,D-64291 DARMSTADT,GERMANY. RI Peitzmann, Thomas/K-2206-2012; Lohner, Herbert/B-2397-2014 OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X NR 17 TC 94 Z9 97 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 MAY 6 PY 1996 VL 76 IS 19 BP 3506 EP 3509 DI 10.1103/PhysRevLett.76.3506 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000010 ER PT J AU Clark, RM Lee, IY Fallon, P Joss, DT Asztalos, SJ Becker, JA Bernstein, L Cederwall, B Deleplanque, MA Diamond, RM Farris, LP Hauschild, K Kelly, WH Macchiavelli, AO Nolan, PJ OBrien, N Semple, AT Stephens, FS Wadsworth, R AF Clark, RM Lee, IY Fallon, P Joss, DT Asztalos, SJ Becker, JA Bernstein, L Cederwall, B Deleplanque, MA Diamond, RM Farris, LP Hauschild, K Kelly, WH Macchiavelli, AO Nolan, PJ OBrien, N Semple, AT Stephens, FS Wadsworth, R TI Relative deformations of superdeformed bands in Ce-131,Ce-132 SO PHYSICAL REVIEW LETTERS LA English DT Article ID LIFETIME MEASUREMENTS; CE-131 AB The quadrupole moments Q(0) of five superdeformed bands in Ce-131,Ce-132 have been established using the Doppler-shift attenuation method; for the first time, we can compare relative deformations of yrast and excited bands in different nuclei to an accuracy of similar or equal to(5-7)%. Four of the five bands have very similar deformations, while the excited band in Ce-131 has a somewhat larger quadrupole moment. Important new information is presented on the shape-driving force of the vi(13/2) orbital, the stability of the second minimum with respect to particle excitations, the relative deformations of identical bands, the nature of the sidefeeding, and the time scale of the decay process. C1 UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP Clark, RM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Hauschild, Karl/A-6726-2009; Cederwall, Bo/M-3337-2014 OI Cederwall, Bo/0000-0003-1771-2656 NR 17 TC 55 Z9 55 U1 1 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 MAY 6 PY 1996 VL 76 IS 19 BP 3510 EP 3513 DI 10.1103/PhysRevLett.76.3510 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000011 ER PT J AU Anthony, PL BeckerSzendy, R Bosted, PE CavalliSforza, M Keller, LP Kelley, LA Klein, SR Niemi, G Perl, ML Rochester, LS White, JL AF Anthony, PL BeckerSzendy, R Bosted, PE CavalliSforza, M Keller, LP Kelley, LA Klein, SR Niemi, G Perl, ML Rochester, LS White, JL TI Measurement of dielectric suppression of bremsstrahlung SO PHYSICAL REVIEW LETTERS LA English DT Article AB In 1953, Ter-Mikaelian predicted that low energy bremsstrahlung from relativistic electrons moving through a medium is suppressed, because of interactions between the emitted photon and the electrons in the medium. This suppression occurs because the emission takes place on a long distance scale, allowing for destructive interference between different instantaneous photon emission amplitudes. We present measurements of bremsstrahlung cross sections of 200 keV to 20 MeV photons produced by 8 and 25 GeV electrons in carbon and gold targets. Our data show-that dielectric suppression occurs at the predicted level, reducing the measured cross section up to 75%. C1 AMERICAN UNIV, WASHINGTON, DC 20016 USA. UNIV CALIF SANTA CRUZ, SANTA CRUZ INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP Anthony, PL (reprint author), STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. RI Cavalli-Sforza, Matteo/H-7102-2015 NR 15 TC 38 Z9 38 U1 1 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 MAY 6 PY 1996 VL 76 IS 19 BP 3550 EP 3553 DI 10.1103/PhysRevLett.76.3550 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000021 ER PT J AU Kalantar, DH Key, MH DaSilva, LB Glendinning, SG Knauer, JP Remington, BA Weber, F Weber, SV AF Kalantar, DH Key, MH DaSilva, LB Glendinning, SG Knauer, JP Remington, BA Weber, F Weber, SV TI Measurement of 0.35 mu m laser imprint in a thin Si foil using an x-ray laser backlighter SO PHYSICAL REVIEW LETTERS LA English DT Article ID OPACITY; BEAM AB Imprinted modulations in optical depth of a thin Si foil due to 0.35 mu m laser irradiation at about 3 x 10(12) W/cm(2) have been measured at shock breakout, These measurements were made by high resolution face-on radiography using a gain saturated yttrium x-ray laser backlighter operating at a wavelength of 15.5 nm with a multilayer optics imaging system. The imprinted modulation due to a static speckle pattern and a 0.29 and a 0.33 THz spectral dispersion smoothed speckle pattern were studied. Comparison of the imprinted modulation is made with simulations. C1 RUTHERFORD APPLETON LAB,CHILTON,ENGLAND. UNIV OXFORD,OXFORD,ENGLAND. UNIV ROCHESTER,LASER ENERGET LAB,ROCHESTER,NY 14627. RP Kalantar, DH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 22 TC 66 Z9 68 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 MAY 6 PY 1996 VL 76 IS 19 BP 3574 EP 3577 DI 10.1103/PhysRevLett.76.3574 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000027 ER PT J AU Wang, WZ Gammel, JT Bishop, AR Salkola, MI AF Wang, WZ Gammel, JT Bishop, AR Salkola, MI TI Quantum breathers in a nonlinear lattice SO PHYSICAL REVIEW LETTERS LA English DT Article AB We study nonlinear phonon excitations in a one-dimensional quantum nonlinear lattice model using numerical exact diagonalization. We find that multiphonon bound states exist as eigenstates which are natural counterparts of breather solutions of classical nonlinear systems. in a translationally invariant system, these quantum breather states form particlelike bands and are characterized by a finite correlation length. The dynamic structure factor has significant intensity for the breather states, with a corresponding quenching of the neighboring bands of multiphonon extended states. C1 MCMASTER UNIV, DEPT PHYS & ASTRON, HAMILTON, ON L8S 4M1, CANADA. RP Wang, WZ (reprint author), LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 19 TC 83 Z9 84 U1 0 U2 3 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 MAY 6 PY 1996 VL 76 IS 19 BP 3598 EP 3601 DI 10.1103/PhysRevLett.76.3598 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000033 ER PT J AU Zambetaki, I Li, QM Economou, EN Soukoulis, CM AF Zambetaki, I Li, QM Economou, EN Soukoulis, CM TI Localization in highly anisotropic systems SO PHYSICAL REVIEW LETTERS LA English DT Article ID ANDERSON LOCALIZATION; MODEL; TRANSPORT; METALS AB The localization behavior of the Anderson model with anisotropic hopping integral t for weakly coupled planes and weakly coupled chains is investigated both numerically with the transfer-matrix method and analytically within the self-consistent theory of localization. It is found that the mobility edge is independent of the propagating direction. However, the correlation (localization) length in the extended (localized) side of the transition can be very different for the two directions. The critical disorder W-c is found to vary from t(1/4) for weakly coupled giants to t(1/2) for weakly coupled chains. C1 DEPT PHYS,GR-71110 IRAKLION,CRETE,GREECE. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP Zambetaki, I (reprint author), RES CTR CRETE,POB 1527,GR-71110 IRAKLION,CRETE,GREECE. RI Economou, Eleftherios /E-6374-2010; Soukoulis, Costas/A-5295-2008 NR 30 TC 43 Z9 43 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 MAY 6 PY 1996 VL 76 IS 19 BP 3614 EP 3617 DI 10.1103/PhysRevLett.76.3614 PG 4 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000037 ER PT J AU Baddorf, AP Swan, AK Wendelken, JF AF Baddorf, AP Swan, AK Wendelken, JF TI In-plane lattice reconstruction of Cn(100) - Comment SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE RP Baddorf, AP (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Baddorf, Arthur/I-1308-2016 OI Baddorf, Arthur/0000-0001-7023-2382 NR 7 TC 9 Z9 9 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 MAY 6 PY 1996 VL 76 IS 19 BP 3658 EP 3658 DI 10.1103/PhysRevLett.76.3658 PG 1 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000051 ER PT J AU Robinson, IK Moritz, W Jona, F VanHove, MA AF Robinson, IK Moritz, W Jona, F VanHove, MA TI In-plane lattice reconstruction of Cn(100) - Comment SO PHYSICAL REVIEW LETTERS LA English DT Article C1 UNIV MUNICH,INST KRISTALLOG & MINERAL,D-8000 MUNICH,GERMANY. SUNY STONY BROOK,DEPT MAT SCI,STONY BROOK,NY 11794. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP Robinson, IK (reprint author), UNIV ILLINOIS,DEPT PHYS,1110 W GREEN ST,URBANA,IL 61801, USA. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 5 TC 10 Z9 10 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 MAY 6 PY 1996 VL 76 IS 19 BP 3659 EP 3659 DI 10.1103/PhysRevLett.76.3659 PG 1 WC Physics, Multidisciplinary SC Physics GA UW490 UT WOS:A1996UW49000052 ER PT J AU Yoo, CS Soderlind, P Moriarty, JA Cambell, AJ AF Yoo, CS Soderlind, P Moriarty, JA Cambell, AJ TI dhcp as a possible new epsilon' phase of iron at high pressures and temperatures SO PHYSICS LETTERS A LA English DT Article ID EARTH CORE CONDITIONS; DIAGRAM; SYSTEMS AB Using in-situ X-ray diffraction and ab initio theoretical calculations, we have identified a possible new phase of iron, epsilon'-Fe, in the stability field of what was previously known for epsilon(hcp)- and gamma(fcc)-Fe, The crystal structure of epsilon'-Fe is indexed to a dhcp structure with an ABAC stacking sequence. The epsilon'-phase exists at temperatures lower than the gamma-phase and at pressures between 15 and 40 GPa, which differs from the stability field previously suggested for beta-Fe above 40 GPa. C1 CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. RP Yoo, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 22 TC 31 Z9 31 U1 1 U2 4 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 MAY 6 PY 1996 VL 214 IS 1-2 BP 65 EP 70 DI 10.1016/0375-9601(96)00160-0 PG 6 WC Physics, Multidisciplinary SC Physics GA UK262 UT WOS:A1996UK26200010 ER PT J AU Tang, J Bondeson, S Thurnauer, MC AF Tang, J Bondeson, S Thurnauer, MC TI Effects of sequential electron transfer on electron spin polarized transient EPR spectra at high fields SO CHEMICAL PHYSICS LETTERS LA English DT Article ID RHODOBACTER-SPHAEROIDES R-26; REACTION CENTERS; RADICAL PAIRS; SPECTROSCOPY; TEMPERATURE AB Effects of sequential electron transfer on electron spin polarized transient EPR spectra at high magnetic fields are investigated. Unlike the ordinary correlated radical pair model which neglects the effects of an intermediate radical pair, the sequential transfer mechanism becomes increasingly important at higher fields because of stronger singlet-triplet mixing due to a difference in the Zeeman interactions between the donor and the acceptor. Even if the intermediary radical pair has a lifetime of about 300 ps and is not directly detectable by EPR, noticeable changes in the polarized spectrum (at 95 and 250 GHz) of the subsequent radical pair are demonstrated. C1 UNIV WISCONSIN,DEPT CHEM,STEVENS POINT,WI 54481. RP Tang, J (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Tang, Jau/D-8382-2012 OI Tang, Jau/0000-0003-2078-1513 NR 34 TC 19 Z9 20 U1 0 U2 1 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 MAY 3 PY 1996 VL 253 IS 3-4 BP 293 EP 298 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA UL219 UT WOS:A1996UL21900015 ER PT J AU Quang, C Petersen, SL Ducatte, GR Ballou, NE AF Quang, C Petersen, SL Ducatte, GR Ballou, NE TI Characterization and separation of inorganic fine particles by capillary electrophoresis with an indifferent electrolyte system SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE particles, inorganic; metal oxides ID ZONE ELECTROPHORESIS; COLLOIDAL SEMICONDUCTORS; PHOTOELECTROPHORESIS AB The feasibility of using capillary electrophoresis to characterize and separate submicrometer- and micrometer-size metal bil oxide particles (e.g., TiO2, Al2O3, and Fe2O3) was investigated. The use of indifferent electrolyte solutions such as sodium nitrate solutions leads to an electrolyte system without specific surface adsorption of ions but with essentially only electrostatic interactions between electrolyte ions and the surface of metal oxide particles. This system permitted development of a two-site dissociation model that was then applied to a description of the electrophoretic mobility of metal oxide particles as a function of the pH of the indifferent electrolyte solution. The use of unbuffered solutions, along with the tendency of metal oxide particles to form aggregates, prohibits the accurate determination of the electrophoretic mobility. Therefore, only a general agreement between the predicted electrophoretic mobilities and the measured values was obtained using the model. Also, general agreement was achieved between the estimated isoelectric points for the metal oxides and the values reported in the literature. Furthermore, the optimum conditions for separating mixtures of metal oxide particles in indifferent electrolyte solutions were identified. Successful separations of different kinds of metal oxide particles and of metal oxide particles with different polymorphic forms were achieved. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. NR 23 TC 45 Z9 49 U1 1 U2 6 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 MAY 3 PY 1996 VL 732 IS 2 BP 377 EP 384 DI 10.1016/0021-9673(95)01260-5 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA UL386 UT WOS:A1996UL38600022 ER PT J AU Cerritelli, ME Studier, FW AF Cerritelli, ME Studier, FW TI Assembly of T7 capsids from independently expressed and purified head protein and scaffolding protein SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE bacteriophage T7; capsids; assembly from purified proteins ID RNA-POLYMERASE; CLONED GENES; BACTERIOPHAGE-T7; DNA; INVITRO; VERTEX AB Prohead-like capsid shells containing the scaffolding and head proteins of bacteriophage T7 were isolated after both proteins were expressed from the cloned genes in the same cell. When the head-tail connector protein was also expressed, the isolated capsids contained neither connector nor scaffolding protein and resembled mature phage capsids rather than proheads. However, only a small fraction of the head protein was converted to stable capsid structures in either case. Purified scaffolding protein (expressed individually from the cloned gene) appeared to be a monomer in solution; purified head protein appeared to be a tetramer. The purified proteins reacted in the presence of polyethylene glycol or dextran to produce prohead-like capsid shells and also polycapsids consisting primarily of head protein, similar to the polycapsids observed after infection by T7 mutants lacking connector or core proteins. Neither capsids nor polycapsids were produced in the absence of scaffolding protein. Polycapsids were usually the predominant product even when scaffolding protein was in excess, and a small fraction of scaffolding protein catalyzed the conversion of an excess of head protein to polycapsids. Our results suggest that the first step in the natural pathway to prohead formation is the assembly of incomplete prohead shells, which are normally closed by insertion of a connector-core complex. In the absence of a functional connector-core complex, incomplete capsid shells apparently react further to form polycapsids or completely closed capsid shells. (C) 1996 Academic Press Limited C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM21872] NR 33 TC 38 Z9 40 U1 0 U2 5 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 3 PY 1996 VL 258 IS 2 BP 286 EP 298 DI 10.1006/jmbi.1996.0250 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UH330 UT WOS:A1996UH33000007 PM 8627626 ER PT J AU Cerritelli, ME Studier, FW AF Cerritelli, ME Studier, FW TI Purification and characterization of T7 head-tail connectors expressed from the cloned gene SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE bacteriophage T7; head-tail connector; portal protein; purification; DNA binding ID PORTAL PROTEIN; DNA; BACTERIOPHAGE-T7; SYMMETRY AB Cloned gene 8, which specifies the protein of the head-tail connector of bacteriophage T7, was expressed in Escherichia coli. Extracts prepared in a low-salt buffer gave rise to free monomers, assembled connectors, and various complexes and aggregates. Connectors isolated as single peaks from DEAE-Sepharose and phosphocellulose chromatography gave separate peaks of monomers and stable connectors upon hydroxylapatite chromatography, perhaps because of dissociation of monomer-connector complexes or disassembly of unstable connectors. Electron microscopy showed that the connectors readily formed ordered arrays after hydroxylapatite chromatography, but not before. Addition of 100 mM NaCl to the buffer used to prepare extracts eliminated most complexes and aggregates and gave rise almost entirely to monomers and stable connectors that formed arrays even before hydroxylapatite chromatograpy. The distribution of masses determined by scanning transmission electron microscopy would be consistent with a mixed population of stable connectors containing 12 or 13 monomers, and the same preparation gave two bands upon agarose gel electrophoresis. Connectors bound linear, circular and supercoiled DNA, whereas monomers did not, as determined by a gel-shift assay. No ATPase activity was detected in either monomer or connector preparations in the absence or presence of DNA. (C) 1996 Academic Press Limited C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM21872] NR 31 TC 19 Z9 19 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 3 PY 1996 VL 258 IS 2 BP 299 EP 307 DI 10.1006/jmbi.1996.0251 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UH330 UT WOS:A1996UH33000008 PM 8627627 ER PT J AU Pagoria, PF Mitchell, AR Schmidt, RD AF Pagoria, PF Mitchell, AR Schmidt, RD TI 1,1,1-trimethylhydrazinium iodide: A novel, highly reactive reagent for aromatic amination via vicarious nucleophilic substitution of hydrogen SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article RP Pagoria, PF (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,MAIL STOP L-282,LIVERMORE,CA 94551, USA. NR 11 TC 66 Z9 72 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAY 3 PY 1996 VL 61 IS 9 BP 2934 EP 2935 DI 10.1021/jo952257z PG 2 WC Chemistry, Organic SC Chemistry GA UJ094 UT WOS:A1996UJ09400010 ER PT J AU Berry, RJ Burgess, DRF Nyden, MR Zachariah, MR Melius, CF Schwartz, M AF Berry, RJ Burgess, DRF Nyden, MR Zachariah, MR Melius, CF Schwartz, M TI Halon thermochemistry: Calculated enthalpies of formation of chlorofluoromethanes SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SET CORRELATION ENERGIES; VALENCE BOND MODEL; ELECTRONIC-STRUCTURE; GAUSSIAN-2 THEORY; CHEMISTRY; 1ST-ROW; ATOM AB The ab initio G2, G2(MP2), CBS-4, CBS-Q, and BAC-MP4 methods have been used to calculate the enthalpies of formation of the series of four chloromethanes and six chlorofluoromethanes [CHxFyCl4-x-y, x = 0-3, y = 0-3]. Calculated values of Delta(f)H degrees using the first four ab initio methods exhibit comparatively large systematic negative errors compared with experimental values, up to -50 kJ/mol, which are nearly linearly dependent upon the number of C-F and C-Cl bonds in the molecule. It is found for the chlorofluoromethanes that the application of bond additivity corrections (BAC's) to the ab initio enthalpies effectively removes systematic errors in the calculations and yields values that are in close agreement with experimentally derived heats. The rms deviations of the corrected calculated enthalpies from the experimental values are 2.4, 2.6, 3.4, 4.7, and 3.8 kJ/mol for the G2(MP2), G2, CBS-Q, CBS-4, and BAC MP4 methods, respectively. These deviations are lower than the rms errors (6.9 kJ/mol) in the experimental enthalpies. Therefore, it is concluded that any of these calculational procedures, together with bond additivity corrections to remove systematic error, may profitably be used to obtain accurate enthalpies of formation in chlorofluorocarbon species. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. SANDIA NATL LABS,LIVERMORE,CA 94551. UNIV N TEXAS,DEPT CHEM,DENTON,TX 76203. USAF,WRIGHT LAB,MAT DIRECTORATE,WRIGHT PATTERSON AFB,OH 45433. NR 41 TC 43 Z9 43 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 2 PY 1996 VL 100 IS 18 BP 7405 EP 7410 DI 10.1021/jp953427e PG 6 WC Chemistry, Physical SC Chemistry GA UJ117 UT WOS:A1996UJ11700015 ER PT J AU Kumaran, SS Su, MC Lim, KP Michael, JV Wagner, AF AF Kumaran, SS Su, MC Lim, KP Michael, JV Wagner, AF TI Thermal decomposition of CFCl3 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID COLLISION RATE CONSTANTS; BOND-DISSOCIATION ENERGIES; MULTI-PHOTON DISSOCIATION; NEGATIVE-ION FORMATION; SHOCK TUBE TECHNIQUE; FALL-OFF RANGE; UNIMOLECULAR REACTIONS; LOW-PRESSURES; PHOTOLYSIS; INCINERATION AB The thermal decomposition of CFCl3 (CFC-11) has been studied in reflected shock waves using the Cl-atom atomic resonance absorption spectroscopy (ARAS) detection technique. The first thermal rate measurements for CFCl3 (+M) --> CFCl2 + Cl (+M) are reported. The experimental Cl-atom concentration profiles show two distinct rates of formation. The initial fast process gives a Cl-atom yield of 2, and this is followed by slow secondary processes that are density and temperature dependent. The final Cl-atom yield is greater than 2[CFCl3](0). This behavior confirms that C-Cl bond scission is the dominant dissociation pathway for both CFCl3 and the product radical, CFCl2, as observed in an earlier study from this laboratory on the related CF2Cl2 decomposition. Profile fits require the fast subsequent dissociation of CFCl2, and therefore, the short-time kinetics can be best explained as being due to C-Cl bond breaking in the parent, CFCl3. The temperature and density dependences of the later time Cl-atom profiles suggest that the slow secondary rate can be ascribed to reactions involving the carbene diradical, CFCl. The Cl-atom data were analyzed with detailed kinetics modeling calculations. Experiments were performed with varying [CFCl3](0) (15.23, 7.877, 5.159, and 2.496 ppm) in Kr diluent at three (3.1 x 10(1)8, 2.1 x 10(18), and 1.2 x 10(18) cm(-3)) post-shock densities. An Arrhenius fit to the experimental CFCl3 dissociation rates over the T-range 1279-1950 K gives k = (2.82 +/- 1.22) x 10(-8) exp(-26420 +/- 674 K/T) cm(3) molecule(-1) s(-1), with +/-36% error at the one standard deviation level. Comparing this expression to earlier results from this laboratory on CF3Cl, CF2Cl2, and CCl4 suggests that the C-Cl bond strength in CFCl3 should be between those for CF2Cl2 and CCl4. The temperature and pressure dependence of the rate constants, i.e., the falloff from the low-pressure limit, have been characterized with Rice-Ramsperger-Kassel-Marcus (RRKM) calculations using E(0) = (76.5 +/- 0.5) kcal mol(-1) with [Delta E](down) = (800 +/- 215) cm(-1). This E(0) implies Delta(f)H(0,CFCl2)degrees = -20.3 kcal mol(-1), and subsequently Delta H-0 degrees = (58 +/- 2) kcal mol(-1) for CFCl2 --> CFCl + Cl. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Michael, Joe/E-3907-2010 NR 48 TC 19 Z9 19 U1 2 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 2 PY 1996 VL 100 IS 18 BP 7533 EP 7540 DI 10.1021/jp960023t PG 8 WC Chemistry, Physical SC Chemistry GA UJ117 UT WOS:A1996UJ11700032 ER PT J AU Kumaran, SS Su, MC Lim, KP Michael, JV Wagner, AF Harding, LB Dixon, DA AF Kumaran, SS Su, MC Lim, KP Michael, JV Wagner, AF Harding, LB Dixon, DA TI Ab initio calculations and three different applications of unimolecular rate theory for the dissociations of CCl4, CFCl3, CF2Cl2, and CF3Cl SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID COLLISION RATE CONSTANTS; CORRELATED MOLECULAR CALCULATIONS; GAUSSIAN-BASIS SETS; FALL-OFF RANGE; THERMAL-DECOMPOSITION; SHOCK-TUBE; ABINITIO; KINETICS AB Previously measured Cl dissociation rate constants for CCl4 and CFCl3 were analyzed with three different kinetics modeling calculations. The three models differ in detail but primarily are distinguished by the manner in which the high-pressure limiting rate constant is determined: model 1 involves a calibration to transport properties of the dissociated fragments, model 2 uses a Gorin model with a hindrance parameter, and model 3 requires variational transition state theory on an ab initio reaction path where all low-frequency motion off the path is presumed to be a free rotation. All three models have two adjustable parameters: the dissociation energy E(0) and the average energy transferred to the buffer gas [Delta E](down). All three models are found to give comparable fits to the experiment and produce quite similar values for the adjustable parameters. For CCl4 the values are E(0) = (68.2 +/- 1.2) kcal mol(-1) and [Delta E](down) = (750 +/- 125) cm(-1). For CFCl3, the values are E(0) = (76.5 +/- 0.5) kcal mol(-1) with [Delta E](down) = (800 +/- 215) cm(-1). These values are compared to those obtained in similar studies for CF2Cl2 and CF3Cl. The results indicate a substantial and consistent decrease in the C-Cl bond energy with each additional chlorine substitution in the chlorofluoromethanes. Isodesmic electronic structure calculations at the MP2 level confirm this effect but find it to be a little smaller than the experimental results indicate. Extended electronic structure calculations provide heats of formation for all nine CHxFyClz methyl radicals. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. DUPONT CO INC, CENT RES & DEV, EXPTL STN, WILMINGTON, DE 19880 USA. RI Michael, Joe/E-3907-2010 NR 49 TC 44 Z9 45 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 2 PY 1996 VL 100 IS 18 BP 7541 EP 7549 DI 10.1021/jp9600470 PG 9 WC Chemistry, Physical SC Chemistry GA UJ117 UT WOS:A1996UJ11700033 ER PT J AU ChaconTaylor, MR McCarthy, MI AF ChaconTaylor, MR McCarthy, MI TI Ab initio based classical electrostatic potentials for the interaction between molecules and surfaces SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HARTREE-FOCK CALCULATIONS; MAGNESIUM-OXIDE AB Molecular dynamics simulations and free energy calculations based on interactions described by hybrid quantum-classical methods are a logical approach to the study of solvent-molecule and solvent-surface interfaces. These techniques exploit the classical nature of long-range interactions to provide a computationally tractable description of complex interfacial systems. The present work develops and tests the performance of a classical electrostatic potential for describing adsorbate/surface interactions. The electrostatic potential is constructed from a numerical representation of the electric potential, field, and field gradients of the bare surface, as a function of position above the surface, combined with the electric multipolar moments of the adsorbate molecules. The former is obtained from periodic Hartree-Fock calculations on the bare surface; the latter is from molecular Hartree-Fock calculations on the isolated molecules. An empirical, short-range repulsive term is added to the classical ''long-range'' expression for the interaction. The resulting potential is then tested by comparison to periodic Hartree-Fock calculations on the combined adsorbate-surface system. This allows the accuracy of the classical approximation to be evaluated independent of the level of theory used to compute the electronic charge densities. Results are presented for H2O, HCl, and NH3 adsorbates on the (001) surface of MgO. C1 PACIFIC NW NATL LAB,ENVIROMN MOL SCI LAB,RICHLAND,WA 99352. NR 26 TC 37 Z9 37 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 2 PY 1996 VL 100 IS 18 BP 7610 EP 7616 DI 10.1021/jp953513e PG 7 WC Chemistry, Physical SC Chemistry GA UJ117 UT WOS:A1996UJ11700042 ER PT J AU Maldonado, E Shiekhattar, R Sheldon, M Cho, H Drapkin, R Rickert, P Lees, E Anderson, CW Linn, S Reinberg, D AF Maldonado, E Shiekhattar, R Sheldon, M Cho, H Drapkin, R Rickert, P Lees, E Anderson, CW Linn, S Reinberg, D TI A human RNA polymerase II complex associated with SRB and DNA-repair proteins SO NATURE LA English DT Article ID SACCHAROMYCES-CEREVISIAE; TRANSCRIPTION; GENE AB WE report here the isolation of a human RNA polymerase II complex containing a subset of the basal transcription factors and the human homologues of the yeast SRB (for suppressors of RNA polymerase B) proteins(1-3). The complex contains transcriptional coactivators and increases the activation of transcription, In addition, some components of the RNA polymerase II complex participate in DNA repair. C1 UNIV MED & DENT NEW JERSEY,ROBERT WOOD JOHNSON MED SCH,DEPT BIOCHEM,HOWARD HUGHES MED INST,PISCATAWAY,NJ 08854. STANFORD UNIV,DNAX RES INST MOLEC & CELLULAR BIOL INC,DEPT CHEM,PALO ALTO,CA 94304. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. UNIV CALIF BERKELEY,DEPT BIOCHEM,BERKELEY,CA 94720. RI Drapkin, Ronny/E-9944-2016 OI Drapkin, Ronny/0000-0002-6912-6977 NR 31 TC 293 Z9 297 U1 1 U2 6 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAY 2 PY 1996 VL 381 IS 6577 BP 86 EP 89 DI 10.1038/381086a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UJ053 UT WOS:A1996UJ05300063 PM 8609996 ER PT J AU Mok, SC Chan, WY Wong, KK Muto, MG Berkowitz, RS AF Mok, SC Chan, WY Wong, KK Muto, MG Berkowitz, RS TI SPARC, an extracellular matrix protein with tumor-suppressing activity in human ovarian epithelial cells SO ONCOGENE LA English DT Article DE ovarian cancer; SPARC; tumor suppressor; RNA fingerprinting ID MESSENGER-RNA; INSITU HYBRIDIZATION; ENDOTHELIAL-CELLS; OSTEONECTIN; EXPRESSION; GLYCOPROTEIN; GENE; SEQUENCES; SECRETION; TISSUES AB SPARC, also termed osteonectin, BM-40 and 43K protein, is an acidic, cysteine-rich component of the extracellular matrix that has been shown to be directly regulated by progesterone and dexamethasone and indirectly by cytokines. By RNA fingerprinting technique, we cloned a SPARC homolog from the normal human ovarian surface epithelial (HOSE) cells and demonstrated that it is expressed at high levels in the normal HOSE cells but at much lower levels in ovarian carcinoma cells in vitro and in vivo. Subsequently, we transfected the full length SPARC cDNA into an ovarian carcinoma cell line SKOV3 and showed that it reduced the growth rate of the cancer cell line in culture and reduced the cell's ability to induce tumours in nude mice. These results suggest that SPARC may play an important role in growth and and differentiation of the HOSE cells and support the hypothesis that SPARC functions as a tumor suppressor. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. CHINESE UNIV HONG KONG, DEPT ANAT, SHA TIN, HONG KONG. RP Mok, SC (reprint author), HARVARD UNIV, BRIGHAM & WOMENS HOSP, SCH MED, LAB GYNECOL ONCOL, DEPT OBSTET GYNECOL & REPROD BIOL, BOSTON, MA 02115 USA. OI Wong, Kwong-Kwok/0000-0002-0375-6669 FU NCI NIH HHS [CA63381] NR 31 TC 116 Z9 120 U1 0 U2 3 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD MAY 2 PY 1996 VL 12 IS 9 BP 1895 EP 1901 PG 7 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA UK498 UT WOS:A1996UK49800008 PM 8649850 ER PT J AU Eskola, KJ Muller, B Wang, XN AF Eskola, KJ Muller, B Wang, XN TI Screening of initial parton production in ultrarelativistic heavy-ion collisions SO PHYSICS LETTERS B LA English DT Article ID INCLUSIVE CROSS-SECTION; PARTICLE-PRODUCTION; NUCLEAR COLLISIONS; HADRON-COLLISIONS; GLUONS; MODEL; TEMPERATURE AB Screening of initial parton production due to the presence of on-shell partons in high-energy heavy-ion collisions is discussed. It is shown that the divergent cross sections in the calculation of parton production can be regulated self-consistently without an ad hoc cut-off, and that the resultant parton production and transverse energy production rate are finite. C1 THEORET PHYS RES INST,FIN-00014 HELSINKI,FINLAND. DUKE UNIV,DEPT PHYS,DURHAM,NC 27708. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP Eskola, KJ (reprint author), HIGH ENERGY PHYS LAB,POB 9,FIN-00014 HELSINKI,FINLAND. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 26 TC 84 Z9 84 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 MAY 2 PY 1996 VL 374 IS 1-3 BP 20 EP 24 DI 10.1016/0370-2693(96)00186-4 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UL508 UT WOS:A1996UL50800004 ER PT J AU Alexopoulos, T Antoniazzi, L Arenton, M Ballagh, HC Bingham, H Blankman, A Block, M Boden, A Bonomi, G Borodin, SV Budagov, J Cao, ZL Cataldi, G Chen, TY Clark, K Cline, D Conetti, S Cooper, M Corti, G Cox, B Creti, P Dukes, C Durandet, C Elia, V Erwin, AR Evangelista, E Fortney, L Golovatyuk, V Gorini, E Grancagnolo, F HaganIngram, K Haire, M Hanlet, P He, M Introzzi, G Jenkins, M Jennings, J Judd, D Kononenko, W Kowald, W Lau, K Lawry, T Ledovskoy, A Liguori, G Lys, J Mazur, PO McManus, AP Misawa, S Mo, GH Murphy, CT Nelson, K Panareo, M Pogosyan, V Ramachandran, S Recagni, M Rhoades, J Segal, J Selove, W Smith, RP Spiegel, L Sun, JG Tokar, S Torre, P Trischuk, J Turnbull, L Tzamouranis, I Wagoner, DE Wang, CR Wei, C Yang, W Yao, N Zhang, NJ Zhang, SN Zou, BT AF Alexopoulos, T Antoniazzi, L Arenton, M Ballagh, HC Bingham, H Blankman, A Block, M Boden, A Bonomi, G Borodin, SV Budagov, J Cao, ZL Cataldi, G Chen, TY Clark, K Cline, D Conetti, S Cooper, M Corti, G Cox, B Creti, P Dukes, C Durandet, C Elia, V Erwin, AR Evangelista, E Fortney, L Golovatyuk, V Gorini, E Grancagnolo, F HaganIngram, K Haire, M Hanlet, P He, M Introzzi, G Jenkins, M Jennings, J Judd, D Kononenko, W Kowald, W Lau, K Lawry, T Ledovskoy, A Liguori, G Lys, J Mazur, PO McManus, AP Misawa, S Mo, GH Murphy, CT Nelson, K Panareo, M Pogosyan, V Ramachandran, S Recagni, M Rhoades, J Segal, J Selove, W Smith, RP Spiegel, L Sun, JG Tokar, S Torre, P Trischuk, J Turnbull, L Tzamouranis, I Wagoner, DE Wang, CR Wei, C Yang, W Yao, N Zhang, NJ Zhang, SN Zou, BT TI Production of J/psi, psi' and Upsilon in 800 GeV/c proton-silicon interactions SO PHYSICS LETTERS B LA English DT Article ID DEPENDENCE AB We report on the analysis of Charmonium and Bottomium states produced in p-Si interactions at root s = 38.7 GeV. The data have been collected with the open geometry spectrometer of the E771 Experiment at the FNAL High Intensity Lab. J/psi psi' and Y total cross sections as well as the ratio B(psi' --> mu mu)sigma(psi)/(B(J/psi, --> mu mu)sigma(J/psi)) have been measured. Results are compared with theoretical predictions and with results at other energies. C1 UNIV PAVIA,I-27100 PAVIA,ITALY. IST NAZL FIS NUCL,I-27100 PAVIA,ITALY. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22901. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV PENN,PHILADELPHIA,PA 19104. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. JINR,DUBNA,RUSSIA. UNIV LECCE,LECCE,ITALY. IST NAZL FIS NUCL,I-73100 LECCE,ITALY. NANJING UNIV,NANJING 210008,PEOPLES R CHINA. UNIV S ALABAMA,MOBILE,AL 36688. VANIER COLL,MONTREAL,PQ,CANADA. DUKE UNIV,DURHAM,NC 27706. PRAIRIE VIEW A&M,PRAIRIE VIEW,TX 77446. SHANDONG UNIV,JINAN 250100,SHANDONG,PEOPLES R CHINA. UNIV HOUSTON,HOUSTON,TX 77204. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60506. COMENIUS UNIV BRATISLAVA,BRATISLAVA,SLOVAKIA. MCGILL UNIV,MONTREAL,PQ,CANADA. RP Alexopoulos, T (reprint author), UNIV WISCONSIN,MADISON,WI 53706, USA. RI Bonomi, Germano/G-4236-2010; Introzzi, Gianluca/K-2497-2015; Elia, Valerio/N-4584-2015; Panareo, Marco/Q-4563-2016 OI Bonomi, Germano/0000-0003-1618-9648; Introzzi, Gianluca/0000-0002-1314-2580; Elia, Valerio/0000-0002-0208-5947; Panareo, Marco/0000-0002-7757-5553 NR 19 TC 34 Z9 34 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 MAY 2 PY 1996 VL 374 IS 1-3 BP 271 EP 276 DI 10.1016/0370-2693(96)00256-0 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA UL508 UT WOS:A1996UL50800043 ER PT J AU Papoular, RJ Vekhter, Y Coppens, P AF Papoular, RJ Vekhter, Y Coppens, P TI The two-channel maximum-entropy method applied to the charge density of a molecular crystal: alpha-glycine SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID NEUTRON-DIFFRACTION DATA; ELECTRON-DENSITY; IMAGE-RECONSTRUCTION; HYDROGEN-BOND AB A two-channel maximum-entropy method (MEM), first used to enhance magnetization densities from phased polarized neutron data by Papoular & Gillon [(1990). Europhys. Lett. 13, 429-434], has been applied to the electron deformation density. The resulting entropic densities are compared with standard deformation densities and with dynamic and static deformation maps obtained from multipole refinements. The procedure is illustrated with simulated and real single-crystal X-ray data sets on the molecular crystal of alpha-glycine. Both a uniform prior and a prior equal to the MEM-enhanced dynamic model deformation density are used in the MEM procedure, the result of which does not depend on the starting density. The method is judged by the appearance of the resulting maps and the values of the molecular dipole moment before and after the MEM. Compared with the conventional deformation density, the MEM procedure sharpens the peaks in the bond but flattens the weaker features, especially when a uniform prior is used. The dipole-moment criterion shows the non-uniform prior to be preferable to the uniform prior in reproducing electrostatic properties. The usefulness of the MEM in charge-density analysis remains open to discussion. C1 CTR ETUD SACLAY, LAB LEON BRILLOUIN, F-91191 GIF SUR YVETTE, FRANCE. SUNY BUFFALO, DEPT CHEM, BUFFALO, NY 14260 USA. RP Papoular, RJ (reprint author), BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 28 TC 30 Z9 30 U1 0 U2 2 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD MAY 1 PY 1996 VL 52 BP 397 EP 407 DI 10.1107/S0108767395017132 PN 3 PG 11 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA UL811 UT WOS:A1996UL81100010 ER PT J AU Stojanoff, V Siddons, DP AF Stojanoff, V Siddons, DP TI X-ray topography of a lysozyme crystal SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID DIFFRACTION TOPOGRAPHY; SYNCHROTRON RADIATION AB X-ray topography methods were employed to identify defects in lysozyme crystals. White-beam and monochromatic topographs of lysozyme crystals obtained at the National Synchrotron Light Source are presented. RP Stojanoff, V (reprint author), BROOKHAVEN NATL LAB,NSLS,UPTON,NY 11973, USA. RI stojanoff, vivian /I-7290-2012 OI stojanoff, vivian /0000-0002-6650-512X NR 10 TC 41 Z9 41 U1 0 U2 2 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD MAY 1 PY 1996 VL 52 BP 498 EP 499 DI 10.1107/S0108767395014553 PN 3 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA UL811 UT WOS:A1996UL81100023 ER PT J AU Anderson, DH Weiss, MS Eisenberg, D AF Anderson, DH Weiss, MS Eisenberg, D TI A challenging case for protein crystal structure determination: The mating pheromone Er-1 from Euplotes raikovi SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID REFINEMENT AB Four different phasing methods have been applied to the determination of the crystal structure of the 40 amino-acid mating pheromone of the unicellular ciliated protozoan Euplotes raikovi. The difficulties, failures and successes in attempts to solve the structure by: (1) molecular replacement, (2) direct phasing using the 'Shake and Bake' algorithm, (3) isomorphous replacement, and (4) multiple-wavelength anomalous dispersion are described. The structure was first solved by molecular replacement, and then was the first successful structure determination by 'Shake and Bake' without the direct involvement of its authors. A description of the current status of the high-resolution refinement of the structure is also given. The model is refined against 1 Angstrom resolution data to an R factor of 12.9%, and includes H atoms and discretely disordered side chains. C1 UNIV CALIF LOS ANGELES,INST MOLEC BIOL,LOS ANGELES,CA 90095. RP Anderson, DH (reprint author), UNIV CALIF LOS ANGELES,US DOE,LAB STRUCT BIOL & MOL MED,BOX 951570,LOS ANGELES,CA 90095, USA. RI Weiss, Manfred/B-6857-2013 NR 31 TC 41 Z9 41 U1 0 U2 3 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0907-4449 J9 ACTA CRYSTALLOGR D JI Acta Crystallogr. Sect. D-Biol. Crystallogr. PD MAY 1 PY 1996 VL 52 BP 469 EP 480 DI 10.1107/S0907444995014235 PN 3 PG 12 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA UP941 UT WOS:A1996UP94100007 PM 15299668 ER PT J AU Baker, EN Blundell, TL Vijayan, M Dodson, E Dodson, G Gilliland, GL Sussman, JL AF Baker, EN Blundell, TL Vijayan, M Dodson, E Dodson, G Gilliland, GL Sussman, JL TI Deposition of macromolecular data SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Letter C1 UNIV LONDON BIRKBECK COLL,DEPT CRYSTALLOG,IMPERIAL CANC RES FUND,STRUCT MOLEC BIOL UNIT,LONDON WC1E 7HX,ENGLAND. INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. UNIV YORK,DEPT CHEM,YORK YO1 5DD,N YORKSHIRE,ENGLAND. CTR ADV RES BIOTECHNOL,ROCKVILLE,MD 20850. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. WEIZMANN INST SCI,DEPT BIOL STRUCT,IL-76100 REHOVOT,ISRAEL. RP Baker, EN (reprint author), MASSEY UNIV,DEPT CHEM & BIOCHEM,PALMERSTON NORTH,NEW ZEALAND. NR 0 TC 4 Z9 4 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0907-4449 J9 ACTA CRYSTALLOGR D JI Acta Crystallogr. Sect. D-Biol. Crystallogr. PD MAY 1 PY 1996 VL 52 BP 609 EP 609 DI 10.1107/S0907444996000388 PN 3 PG 1 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA UP941 UT WOS:A1996UP94100034 PM 15299695 ER PT J AU Maloy, SA Gray, GT AF Maloy, SA Gray, GT TI High strain rate deformation of Ti-48Al-2Nb-2Cr SO ACTA MATERIALIA LA English DT Article ID POSITIVE TEMPERATURE-DEPENDENCE; YIELD STRESS; ELEVATED-TEMPERATURES; SINGLE-CRYSTALS; COMPOUND; DISSOCIATION; MECHANISMS; ANOMALIES; FRACTURE; MODELS AB The compressive deformation behavior of Ti-48Al-2Nb-2Cr in the duplex microstructural morphology has been studied at strain rates of 0.001 and 2000 s(-1) over the temperature range from -196 to 1100 degrees C. The yield stress for the duplex microstructure is strain rate sensitive at 25 degrees C and increases with temperature from 500 to 1100 degrees C at a strain rate of 2000 s(-1). TEM investigations revealed that deformation occurs in gamma-TiAl by means of {111}[112] twinning, 1/2[110] slip and [101] superdislocations under all conditions depending on the orientation of the grain with respect to the deformation axis. Optical metallography revealed that twinning increases with increasing strain rate. The flow stress anomaly is discussed in reference to the dislocation substructure in gamma-TiAl. RP Maloy, SA (reprint author), LOS ALAMOS NATL LAB,MST-5,MS-G755,LOS ALAMOS,NM 87545, USA. RI Maloy, Stuart/A-8672-2009 OI Maloy, Stuart/0000-0001-8037-1319 NR 32 TC 49 Z9 51 U1 1 U2 27 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6454 J9 ACTA MATER JI Acta Mater. PD MAY PY 1996 VL 44 IS 5 BP 1741 EP 1756 DI 10.1016/1359-6454(95)00329-0 PG 16 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA UF046 UT WOS:A1996UF04600003 ER PT J AU George, EP Liu, CT Pope, DP AF George, EP Liu, CT Pope, DP TI Mechanical behavior of Ni3Al: Effects of environment, strain rate, temperature and boron doping SO ACTA MATERIALIA LA English DT Article ID INTERMETALLIC COMPOUND NI3AL; GRAIN-BOUNDARY FRACTURE; DOPED NI3AL; MAJOR CAUSE; EMBRITTLEMENT; DUCTILITY; FEAL AB The mechanical behavior of polycrystalline Ni3Al was studied as functions of environment, strain rate, temperature and boron doping. We find that the ductility of boron-free Ni3Al increases with increasing strain rate, increasing (or decreasing) temperature from room temperature, and decreasing amounts of water vapor in the test environment. The present results are consistent with our earlier conclusion that moisture-induced environmental embrittlement is a major cause of the room-temperature brittleness of Ni3Al. We also find in the present study that boron suppresses environmental embrittlement in Ni3Al; however, its efficacy depends on the amount added. Al a level of 100 wppm, it quite effectively suppresses environmental embrittlement, with ductility remaining high and insensitive to strain rate in both air and water. At a level of 50 wppm, however, boron alleviates environmental embrittlement only in air-in water the ductility is strongly strain-rate sensitive. Boron also affects the fracture mode, tending in general to promote transgranular fracture if present in sufficient quantity. C1 UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. RP George, EP (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI George, Easo/L-5434-2014; OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 24 TC 75 Z9 78 U1 0 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6454 J9 ACTA MATER JI Acta Mater. PD MAY PY 1996 VL 44 IS 5 BP 1757 EP 1763 DI 10.1016/1359-6454(95)00331-2 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA UF046 UT WOS:A1996UF04600004 ER PT J AU Biner, SB AF Biner, SB TI An analysis of grain boundary sliding and grain boundary cavitation in discontinuously reinforced composites SO ACTA MATERIALIA LA English DT Article ID POWER-LAW CREEP; DIFFUSIVE CAVITATION; RUPTURE; POLYCRYSTALS; DEFORMATION; BEHAVIOR; FACETS; GROWTH; CRACKS; DAMAGE AB In this study, the creep cavitation and rupture characteristics of polycrystalline matrix material and discontinuously reinforced composites are investigated including grain boundary sliding behavior, reinforcement aspect ratio and interfacial behavior between the reinforcement and surrounding matrix grains. Free sliding of the grain boundaries, a continuous nucleation of the grain boundary cavities, their diffusional growth and coalescence to form grain boundary facet cracks are fully accounted for in the analyses. The results indicate that, with sliding grain boundaries, the stress enhancement factor for the composites is much higher than the one observed for the matrix material and its value increases with increasing reinforcement aspect ratio, reduction in the matrix grain size and sliding interfacial behavior between the reinforcement and the matrix. For the composites, the influence of grain boundary sliding on the creep life is reduced by the stress concentration effect that is seen at the end of the reinforcements. In contrast with the behavior of polycrystalline matrix material in composites after the formation of the first facet crack, resulting from the coalescence of the cavities, a significant time is required for the formation of the other grain boundary facet cracks across the ligament to cause final rupture. The results also show that experimentally observed higher creep exponents or stress dependent creep exponent values in discontinuously reinforced composites can occur as a result of creep damage evolution behavior. RP Biner, SB (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. NR 46 TC 13 Z9 14 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6454 J9 ACTA MATER JI Acta Mater. PD MAY PY 1996 VL 44 IS 5 BP 1813 EP 1829 DI 10.1016/1359-6454(95)00322-3 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA UF046 UT WOS:A1996UF04600009 ER PT J AU Zettl, A AF Zettl, A TI Non-carbon nanotubes SO ADVANCED MATERIALS LA English DT Editorial Material ID MICROTUBULES; C-60; FORM AB Nanotube formation is not limited to carbon, and in fact seems to be a general feature of layered materials. The classes of new nanotubes that have been synthesized, e.g., boron-nitride-containing compounds and transition-metal dichalcogenides, are briefly reviewed. Theoretical predictions, such as the type II BC2N nanocoil, the smallest possible solenoid, point to enticing research and application opportunities, for example miniature transformers and magnetic storage or on-nanotube devices (pn junctions, etc.). C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP Zettl, A (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 18 TC 46 Z9 49 U1 1 U2 18 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD MAY PY 1996 VL 8 IS 5 BP 443 EP & DI 10.1002/adma.19960080516 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 UN676 UT WOS:A1996UN67600014 ER PT J AU Finnan, JM Jones, MB Burke, JI AF Finnan, JM Jones, MB Burke, JI TI A time-concentration study on the effects of ozone on spring wheat (Triticum aestivum L) .1. Effects on yield SO AGRICULTURE ECOSYSTEMS & ENVIRONMENT LA English DT Article DE ozone; spring wheat; Triticum aestivum L; time-concentration study; yield ID TOP FIELD CHAMBERS; WINTER-WHEAT; GRAIN QUALITY; STIMULATION; AMBIENT; IMPACT; GROWTH; BEANS AB Spring-sown wheat (Triticum aestivum L., cv. 'Promessa') was grown in open-top chambers and ambient-air plots at a site in the southeast of Ireland, and exposed to different concentrations of ozone in a 3-year study carried out from 1991 to 1993. The treatments used in the study were charcoal-filtered air, non-filtered air and non-filtered air to which extra ozone was added. Additional ozone was added to the treatments either as short-term high-concentration exposures or as long-term low-concentration exposures, Air filtration had no significant effect on grain yield, indicating that ambient levels of ozone over the experimental period in the study area did not have the potential to decrease the yield of spring wheat crops. Additional ozone exposures with higher peak concentrations had the most detrimental effect on grain yield. Short-term fumigation with ambient ozone plus 50 parts per billion (p.p.b.) in 1991 resulted in a 53% reduction in grain yield. In 1992 a similar cumulative exposure but with ambient ozone plus 25 p.p.b. applied over a longer time interval increased grain yield by 17%. In 1993 these observations were confirmed when an ozone exposure with higher peak concentrations significantly reduced grain yield, while an identical exposure with lower peak concentrations had no effect. Changes in grain yield were primarily the result of changes in grain filling. They were accompanied by changes in protein percentage as well as in the percentage of small, improperly filled grains, The results suggest that increased emphasis should be given to peak concentrations in the assessment of ozone effects on vegetation. C1 UNIV DUBLIN TRINITY COLL,DEPT BOT,DUBLIN 2,IRELAND. RP Finnan, JM (reprint author), TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. RI Finnan, John/D-1326-2016 NR 24 TC 28 Z9 34 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8809 J9 AGR ECOSYST ENVIRON JI Agric. Ecosyst. Environ. PD MAY PY 1996 VL 57 IS 2-3 BP 159 EP 167 DI 10.1016/0167-8809(95)01003-3 PG 9 WC Agriculture, Multidisciplinary; Ecology; Environmental Sciences SC Agriculture; Environmental Sciences & Ecology GA UV525 UT WOS:A1996UV52500007 ER PT J AU Finnan, JM Jones, MB Burke, JI AF Finnan, JM Jones, MB Burke, JI TI A time-concentration study on the effects of ozone on spring wheat (Triticum aestivum L) .2. A comparison of indices SO AGRICULTURE ECOSYSTEMS & ENVIRONMENT LA English DT Article DE ozone; spring wheat; Triticum aestivum L; time-concentration study; indices ID YIELD; EXPOSURE; INDEXES; IMPACT; O-3 AB Several indices to describe the relationship between time-concentration of ozone and the resulting changes in grain yield were evaluated. In addition, hourly ozone concentrations were weighted with simultaneous sunshine hour values in an attempt to incorporate a measure of absorbed dose into current indices. Sunshine hour values were chosen as an environmental variable which would approximately reflect stomatal conductance at the time of exposure. Index performance was evaluated by fitting a polynomial model to the exposure-response data. Treatment effects on grain yield were unrelated to characterisations of ozone exposure obtained using either mean values or cumulative totals. Progressively better fits of the data were obtained, however, when cumulative totals were calculated above progressively increasing threshold concentrations. Good fits were obtained when indices which summed concentrations above thresholds of 50, 60 and 70 ppb were used. Cumulation of radiation weighted ozone concentrations above progressively increasing threshold concentrations also resulted in improving fits. However, those indices which used hourly ozone concentrations weighted with sunshine hour values did not perform as well as those which only used hourly ozone concentrations. Testing of the relationship on more extensive data is recommended. C1 TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. RP Finnan, JM (reprint author), UNIV DUBLIN TRINITY COLL,DEPT BOT,DUBLIN 2,IRELAND. RI Finnan, John/D-1326-2016 NR 29 TC 4 Z9 4 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8809 J9 AGR ECOSYST ENVIRON JI Agric. Ecosyst. Environ. PD MAY PY 1996 VL 57 IS 2-3 BP 169 EP 177 DI 10.1016/0167-8809(95)01004-1 PG 9 WC Agriculture, Multidisciplinary; Ecology; Environmental Sciences SC Agriculture; Environmental Sciences & Ecology GA UV525 UT WOS:A1996UV52500008 ER PT J AU Knoll, DA McHugh, PR Keyes, DE AF Knoll, DA McHugh, PR Keyes, DE TI Newton-Krylov methods for low-Mach-number compressible combustion SO AIAA JOURNAL LA English DT Article ID ITERATIVE SOLUTION; LINEAR-SYSTEMS; EQUATIONS; MATRIX; FLOWS AB Fully coupled numerical techniques are used to compute steady-state solutions to a combusting, low-Mach-number compressible flow through a channel. The nonlinear governing equations are discretized on a staggered mesh via integration over discrete finite volumes. The resulting nonlinear algebraic equations are linearized with Newton's method and solved with a preconditioned Krylov algorithm. The selected Krylov solver is the generalized minimum residual algorithm. A matrix-free Newton-Krylov method and a modified Newton-Krylov method are employed as a means of reducing the required number of expensive Jacobian evaluations. The matrix-free implementation is shown to be superior to the modified Newton-Krylov method when starting from a poor initial guess. The technique of mesh sequencing is shown to provide significant CPU savings for fine grid calculations. Additionally, the domain-based multiplicative Schwarz preconditioning strategy was found to be more effective than incomplete lower-upper factorization type preconditioning at lower Mach numbers. C1 OLD DOMINION UNIV,DEPT COMP SCI,NORFOLK,VA 23529. NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23681. RP Knoll, DA (reprint author), IDAHO NATL ENGN LAB,ENGN ANAL DEPT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 25 TC 22 Z9 22 U1 0 U2 4 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD MAY PY 1996 VL 34 IS 5 BP 961 EP 967 DI 10.2514/3.13174 PG 7 WC Engineering, Aerospace SC Engineering GA UH935 UT WOS:A1996UH93500012 ER PT J AU Nelson, ME Fiatarone, MA Layne, JE Trice, I Economos, CD Fielding, RA Ma, RM Pierson, RN Evans, WJ AF Nelson, ME Fiatarone, MA Layne, JE Trice, I Economos, CD Fielding, RA Ma, RM Pierson, RN Evans, WJ TI Analysis of body-composition techniques and models for detecting change in soft tissue with strength training SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Article DE soft tissue; muscle mass; fat-free mass; total body water; strength training; aging; postmenopausal status; exercise ID MUSCLE HYPERTROPHY; SKELETAL-MUSCLE; WOMEN; MORPHOLOGY; MEN AB The purpose of this study was to compare the ability of various body-composition assessment techniques to detect changes in soft tissue in older, weight-stable women (50-70 y of age) completing a 1-y randomized, controlled trial of progressive resistance training. The intervention group (n = 20) performed high-intensity strength-training 2 d/wk with five different exercises; the control group (n = 19) was untreated. Hydrostatic weighing, 24-h urinary creatinine, computed tomography of thigh sections, total body potassium, and tritium dilution techniques were used to measure increases in total fat-free mass (FFM) and the muscle and water components of FFM. A decrease in fat mass (by hydrostatic weighing) was seen in the strength-trained women compared with the control subjects (P = 0.01-0.0001). Anthropometry, bioelectric impedance, dual-energy X-ray absorptiometry, and total body nitrogen and carbon did not measure any significant change in soft tissue. The choice of a body-composition technique is important when designing a study expected to affect soft tissue, because not all techniques available are precise enough to detect small changes. C1 HARVARD UNIV,SCH MED,DIV AGING,BOSTON,MA 02115. BOSTON UNIV,SARGENT COLL ALLIED HLTH PROFESS,DEPT HLTH SCI,BOSTON,MA 02215. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. COLUMBIA UNIV,ST LUKES ROOSEVELT HOSP CTR,CTR RES CLIN NUTR,NEW YORK,NY. PENN STATE UNIV,NOLL PHYSIOL RES CTR,UNIVERSITY PK,PA 16802. RP Nelson, ME (reprint author), TUFTS UNIV,USDA,HUMAN NUTR RES CTR AGING,HUMAN PHYSIOL LAB,711 WASHINGTON ST,BOSTON,MA 02111, USA. FU NIDDK NIH HHS [P01-DK42618] NR 18 TC 64 Z9 65 U1 0 U2 6 PU AMER SOC CLIN NUTRITION INC PI BETHESDA PA 9650 ROCKVILLE PIKE SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD MAY PY 1996 VL 63 IS 5 BP 678 EP 686 PG 9 WC Nutrition & Dietetics SC Nutrition & Dietetics GA UG919 UT WOS:A1996UG91900003 PM 8615349 ER PT J AU Schiffer, M AF Schiffer, M TI Molecular anatomy and the pathological expression of antibody light chains SO AMERICAN JOURNAL OF PATHOLOGY LA English DT Article ID IMMUNOGLOBULIN DEPOSITION DISEASE; MONOCLONAL KAPPA-CHAIN; BENCE-JONES PROTEINS; AMYLOIDOSIS; RESOLUTION; STABILITY; SUBGROUP; MYELOMA RP Schiffer, M (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECH,BLDG 202,ROOM A145,9700 S CASS AVE,ARGONNE,IL 60439, USA. FU NIDDK NIH HHS [DK43757] NR 31 TC 19 Z9 21 U1 0 U2 0 PU AMER SOC INVESTIGATIVE PATHOLOGY, INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3993 USA SN 0002-9440 J9 AM J PATHOL JI Am. J. Pathol. PD MAY PY 1996 VL 148 IS 5 BP 1339 EP 1344 PG 6 WC Pathology SC Pathology GA UJ473 UT WOS:A1996UJ47300003 PM 8623904 ER PT J AU Gallo, G Goni, F Boctor, F Vidal, R Kumar, A Stevens, FJ Frangione, B Ghiso, J AF Gallo, G Goni, F Boctor, F Vidal, R Kumar, A Stevens, FJ Frangione, B Ghiso, J TI Light chain cardiomyopathy - Structural analysis of the light chain tissue deposits SO AMERICAN JOURNAL OF PATHOLOGY LA English DT Article ID GLOMERULAR BASEMENT-MEMBRANE; MONOCLONAL KAPPA-CHAIN; VARIABLE REGION; DISEASE; LOCALIZATION; PROTEINS; SUBGROUP; MYELOMA; IMMUNOGLOBULINS; AMYLOIDOSIS AB Cardiomyopathy due to monoclonal light chain deposits is a complication of plasma cell disorders. The deposits may be either fibrillar as in light chain amyloid or nonfibrillar as in light chain deposition disease. The reasons for these structural differences are still unknown. We characterized the myocardial deposits by immunohistochemical examination analysis of the tissue deposits in a patient (MCM) who died of myeloma and systemic light chain deposition disease. Amino acid sequence analyses of the extracted nonfibrillar MCM kappa-light chain reveals that it belongs to the L12a germline subset of the kappa(1) protein and contains five distinctive amino acid substitutions (three in the framework region III and two in the complementarity-determining region III) that have not bee reported previously in the same positions in other kappa(1) light chains. The theoretically determined isoelectric point (pI 8.21) of the MCM light chain is high compared with the low isoelectric point of other Bence Jones proteins from subjects without light chain deposition disease. The diffuse binding to basement membranes and the high isoelectric point of the MCM kappa-light chain suggest electrostatic interaction as a possible mechanism of tissue deposition. The spatial locations of the five distinctive residues and sixth rare substitution of the MCM protein modeled on the backbone structure of REI, a kappa(1)-soluble Bence Jones light chain of known three-dimensional structure, may be responsible for protein destabilization, partial unfolding, and aggregation leading to tissue deposition. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP Gallo, G (reprint author), NYU,MED CTR,DEPT PATHOL,560 1ST AVE,NEW YORK,NY 10016, USA. FU NIAMS NIH HHS [AR02594]; NIDDK NIH HHS [DK43757] NR 40 TC 48 Z9 50 U1 0 U2 1 PU AMER SOC INVESTIGATIVE PATHOLOGY, INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3993 USA SN 0002-9440 J9 AM J PATHOL JI Am. J. Pathol. PD MAY PY 1996 VL 148 IS 5 BP 1397 EP 1406 PG 10 WC Pathology SC Pathology GA UJ473 UT WOS:A1996UJ47300011 PM 8623912 ER PT J AU Crawford, FS AF Crawford, FS TI Rolling and slipping down Galileo's inclined plane: Rhythms of the spheres SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB In ''Two New Sciences'' (TNS) Galileo presents a number of theorems and propositions for smooth solid spheres released from rest and rolling a distance d in time t down an incline of height H and length L. We collect and summarize his results in a single grand proportionality P: d(1)/d(2) = (t(1)(2)/t(2)(2))(H/L)(1)/(H/L)(2). (P) From what he writes in TNS it is clear that what we call P is assumed by Galileo to hold for all inclinations including vertical free fall with H/L = 1. But in TNS he describes only experiments with gentle inclinations H/L < 1/2. Indeed he cannot have performed the vertical free fall (H = L) experiment, because we (moderns) know that as we increase H/L, P starts to break down when H/L exceeds about 0.5, because the sphere, which rolls without slipping for small H/L, starts to slip, whence d starts to exceed the predictions of P, becoming too large by a factor of 7/5 for vertical free fall at H/L = 1. In 1973 Drake and in 1975 Drake and MacLachlan published their analysis of a previously unpublished experiment that Galileo performed that (without his realizing it) directly compared rolling without slipping to free fall. In the experiment, a sphere that has gained speed upsilon(1) while rolling down a gentle incline is deflected so as to be launched horizontally with speed upsilon 1 into a free fall orbit discovered by Galileo to be a parabola. The measured horizontal distance X(2) traveled in this parabolic orbit (for a given vertical distance fallen to the floor) was smaller than he expected, by a factor 0.84. But that is exactly what we (moderns) expect, since we know that Galileo did not appreciate the difference between rolling without slipping, and slipping on a frictionless surface. We therefore expect him to predict X(2) too large by a factor (7/5)(1/2) = 1/0.84. He must have been puzzled. Easy ''home experiments'' with simple apparatus available to Galileo (no frictionless air tracks, strobe lamps, or electronic rimers!) allow the student to use his/her musical ear (for rhythm and tempo) to study vertical free fall as well as balls rolling down steep or gentle inclines, with or without slipping, and perhaps appreciate Galileo's dilemma. (C) 1996 American Association of Physics Teachers. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP Crawford, FS (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 12 TC 6 Z9 6 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD MAY PY 1996 VL 64 IS 5 BP 541 EP 546 DI 10.1119/1.18151 PG 6 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA UJ491 UT WOS:A1996UJ49100018 ER PT J AU Stockwell, HG Brooks, BG Holmes, HH Durst, MJ Shim, YK Heinig, PE AF Stockwell, HG Brooks, BG Holmes, HH Durst, MJ Shim, YK Heinig, PE TI The department of energy's comprehensive epidemiologic data resource: A public-use database on radiation exposure SO AMERICAN JOURNAL OF PUBLIC HEALTH LA English DT Letter ID A-BOMB SURVIVORS; MORTALITY; DS86 C1 US DOE,OFF INFORMAT MANAGEMENT,GERMANTOWN,MD 20874. LAWRENCE BERKELEY LAB,BERKELEY,CA. RP Stockwell, HG (reprint author), US DOE,OFF EPIDEMIOL STUDIES,EH-62,270CC,19901 GERMANTOWN RD,GERMANTOWN,MD 20874, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU AMER PUBLIC HEALTH ASSN INC PI WASHINGTON PA 1015 FIFTEENTH ST NW, WASHINGTON, DC 20005 SN 0090-0036 J9 AM J PUBLIC HEALTH JI Am. J. Public Health PD MAY PY 1996 VL 86 IS 5 BP 747 EP 748 DI 10.2105/AJPH.86.5.747 PG 2 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA UK290 UT WOS:A1996UK29000032 PM 8629735 ER PT J AU Fulkerson, B AF Fulkerson, B TI Fertility and balance SO AMERICAN SCIENTIST LA English DT Letter RP Fulkerson, B (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIGMA XI-SCI RES SOC PI RES TRIANGLE PK PA PO BOX 13975, RES TRIANGLE PK, NC 27709 SN 0003-0996 J9 AM SCI JI Am. Scientist PD MAY-JUN PY 1996 VL 84 IS 3 BP 204 EP 204 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UF392 UT WOS:A1996UF39200002 ER PT J AU Goldman, AI Anderegg, JW Besser, MF Chang, SL Delaney, DW Jenks, CJ Kramer, MJ Lograsso, TA Lynch, DW McCallum, RW Shield, JE Sordelet, DJ Thiel, PA AF Goldman, AI Anderegg, JW Besser, MF Chang, SL Delaney, DW Jenks, CJ Kramer, MJ Lograsso, TA Lynch, DW McCallum, RW Shield, JE Sordelet, DJ Thiel, PA TI Quasicrystalline materials SO AMERICAN SCIENTIST LA English DT Article ID QUASI-CRYSTALS C1 FSI INT,CHASKA,MN. UNIV UTAH,SALT LAKE CITY,UT 84112. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,MAT CHEM DIV,AMES,IA 50011. RP Goldman, AI (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011, USA. NR 8 TC 14 Z9 14 U1 1 U2 2 PU SIGMA XI-SCI RES SOC PI RES TRIANGLE PK PA PO BOX 13975, RES TRIANGLE PK, NC 27709 SN 0003-0996 J9 AM SCI JI Am. Scientist PD MAY-JUN PY 1996 VL 84 IS 3 BP 230 EP 241 PG 12 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA UF392 UT WOS:A1996UF39200016 ER PT J AU Beckman, RJ AF Beckman, RJ TI Plotting p(k) factorial or p(n-k) fractional factorial data SO AMERICAN STATISTICIAN LA English DT Article DE analysis of variance; computer code; graphics; interactions AB This article gives a plotting algorithm for viewing the data from p(k) factorial or p(n-k) fractional factorial experiments, The raw data are displayed in a tree structure where the order of the tree is determined by increasing sums of squares from an analysis of variance model. For small factorial experiments this display allows the experimenter to identify outlying points, see the design structure for fractional factorials, and get a feel for the main effects and interactions present. A computer code written is S that produces the factorial data plot is available from the author. RP Beckman, RJ (reprint author), LOS ALAMOS NATL LAB,STAT GRP,LOS ALAMOS,NM 87545, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU AMER STATIST ASSN PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0003-1305 J9 AM STAT JI Am. Stat. PD MAY PY 1996 VL 50 IS 2 BP 170 EP 174 DI 10.2307/2684433 PG 5 WC Statistics & Probability SC Mathematics GA VV329 UT WOS:A1996VV32900014 ER PT J AU Campiglia, AD Alarie, JP Vo-Dinh, T AF Campiglia, AD Alarie, JP Vo-Dinh, T TI Development of a room temperature phosphorescence fiber-optic sensor SO ANALYTICAL CHEMISTRY LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; LASER-INDUCED FLUORESCENCE; PHOSPHORIMETRY; OXYGEN; PAPER AB The design of a new fiber-optic sensor based on solid-surface room-temperature phosphorimetry is presented for the analyses of polycyclic aromatic hydrocarbons in water samples. Analytical figures of merit are given for several compounds of environmental importance. Limits of detection at the nanograms per milliliter level were estimated for pyrene, benzo[e]pyrene, benzo[ghi]perylene, 1,2:3,4-dibenzanthracene, coronene, and 2,3-benzofluorene. The linearity of response of the phosphorescence sensor was evaluated, showing a fairly linear behavior for quantitative analysis. Finally, the feasibility of monitoring polycyclic aromatic hydrocarbons in aqueous media was illustrated by identifying pyrene in a contaminated ground-water sample. C1 OAK RIDGE NATL LAB, HLTH SCI RES DIV, ADV MONITORING DEV GRP, OAK RIDGE, TN 37830 USA. UNIV BRASILIA, DEPT QUIM, BR-70910900 BRASILIA, DF, BRAZIL. NR 33 TC 26 Z9 26 U1 1 U2 7 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 MAY 1 PY 1996 VL 68 IS 9 BP 1599 EP 1604 DI 10.1021/ac951035y PG 6 WC Chemistry, Analytical SC Chemistry GA UJ085 UT WOS:A1996UJ08500028 PM 21619126 ER PT J AU Wise, MG McArthur, JV Wheat, C Shimkets, LJ AF Wise, MG McArthur, JV Wheat, C Shimkets, LJ TI Temporal variation in genetic diversity and structure of a lotic population of Burkholderia (Pseudomonas) cepacia SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID NATURAL-POPULATIONS; LINKAGE DISEQUILIBRIUM; ESCHERICHIA-COLI; DEGRADATION; TRICHLOROETHYLENE; BACTERIA; SOIL AB The genetic structure and temporal patterns of genetic diversity in a population of Burkholderia (Pseudomonas) cepacia, isolated from a southeastern blackwater stream, were investigated by multilocus enzyme electrophoresis. Allelic variation in seven structural gene loci was monitored at a single stream location at 0, 6, 12, and 21 h and at 2, 4, 8, 16, and 32 days, Over the length of the study, 217 isolates were collected, from which 65 unique electrophoretic types (ETs) were identified. Most of these ETs were present at only one or two time periods and were considered transients; however, one resident ET was particularly abundant (64 of the 217 isolates [29.4%]) and was found at all time points except day 32. The mean genetic diversity of the entire population was 0.520, and the index of association (a measure of multilocus linkage disequilibrium) was 1.33, These results, taken in conjunction with a previous study focusing on spatial patterns of genetic diversity in lotic B. cepacia, show that these bacterial populations exhibit greater variability among sites than within a site over time, suggesting relative stability over short time periods. C1 UNIV GEORGIA,DEPT MICROBIOL,ATHENS,GA 30602. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 31 TC 25 Z9 26 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD MAY PY 1996 VL 62 IS 5 BP 1558 EP 1562 PG 5 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA UJ228 UT WOS:A1996UJ22800011 PM 16535308 ER PT J AU Millard, CS Chao, YP Liao, JC Donnelly, MI AF Millard, CS Chao, YP Liao, JC Donnelly, MI TI Enhanced production of succinic acid by overexpression of phosphoenolpyruvate carboxylase in Escherichia coli SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID ANAEROBIOSPIRILLUM-SUCCINICIPRODUCENS; CARBOXYKINASE; GROWTH; SEQUENCE; ENZYME; GENE AB Fermentative production of succinic acid from glucose by Escherichia coli was significantly increased by overexpression of phosphoenolpyruvate carboxylase. In contrast, overexpression of phosphoenolpyruvate carboxykinase had no effect. Under optimized conditions, induction of the carboxylase resulted in a 3.5-fold increase in the concentration of succinic acid, mailing succinic acid the major fermentation product by weight. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. TEXAS A&M UNIV,DEPT CHEM ENGN,COLLEGE STN,TX 77843. RI Hsing-Yen, Su/G-9552-2014 NR 22 TC 148 Z9 169 U1 2 U2 15 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD MAY PY 1996 VL 62 IS 5 BP 1808 EP 1810 PG 3 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA UJ228 UT WOS:A1996UJ22800053 PM 8633880 ER PT J AU Sturchio, NC Arehart, GB Sultan, M Sano, Y AboKamar, Y Sayed, M AF Sturchio, NC Arehart, GB Sultan, M Sano, Y AboKamar, Y Sayed, M TI Composition and origin of thermal waters in the Gulf of Suez area, Egypt SO APPLIED GEOCHEMISTRY LA English DT Article ID SULFATE AB Thermal waters with discharge temperatures ranging from 32 to 70 degrees C are being discharged along the Gulf of Suez (Egypt) from springs and shallow artesian wells. A comprehensive chemical and isotopic study of these waters supports previous suggestions that the waters are paleometeoric waters from the Nubian sandstone aquifer. The chemical and isotopic compositions of solutes indicate possible contributions from Tertiary sedimentary aquifer rocks and windblown deposits (marine aerosols and/or evaporite dust) in the recharge area. There is no chemical or isotopic evidence for mixing with Red Sea water. Gas effervescence from the Hammam Faraoun thermal water contains about 4% CH4 (delta(13)C = -32.6 parts per thousand) and 0.03% He having an isotopic ratio consistent with a mixture of crustal and magmatic He (He-3/He-4 = 0.26 R(n)). Geothermometers for the thermal waters indicate maximum equilibration temperatures near 100 degrees C. The waters could have been heated by percolation to a depth of several km along the regional geothermal gradient. Copyright (C) 1996 Published by Elsevier Science Ltd. C1 WASHINGTON UNIV,ST LOUIS,MO 63130. HIROSHIMA UNIV,HIROSHIMA 730,JAPAN. EGYPTIAN GEOL SURVEY & MIN AUTHOR,ABBASIYA,CAIRO,EGYPT. RP Sturchio, NC (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 39 TC 20 Z9 21 U1 2 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2927 J9 APPL GEOCHEM JI Appl. Geochem. PD MAY PY 1996 VL 11 IS 3 BP 471 EP 479 DI 10.1016/0883-2927(96)00025-X PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA VB162 UT WOS:A1996VB16200008 ER PT J AU Yang, L Osborne, DH Haglund, RF Magruder, RH White, CW Zuhr, RA Hosono, H AF Yang, L Osborne, DH Haglund, RF Magruder, RH White, CW Zuhr, RA Hosono, H TI Probing interface properties of nanocomposites by third-order nonlinear optics SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID SMALL METALLIC PARTICLES; ION-IMPLANTATION; SURFACE; SILICA; SEMICONDUCTOR; ABSORPTION; TRANSITION; COMPOSITE; COLLOIDS; AG AB We describe the exploitation of third-order nonlinear optical response - particularly nonlinear absorption and the nonlinear index of refraction - to probe interface dynamics, modifications and relaxation processes in granular materials consisting of metal quantum dots embedded in such dielectrics as fused silica and sapphire. Many features of these materials can be interpreted in terms of the quantum-mechanical model of the ''particle-in-a-box''. Electronic and thermal relaxation processes in these novel nanocomposites are dominated by interactions of conduction-band electrons at the boundary between the quantum dot and its surrounding host material. Experimental examples presented include measurements of thermal and electronic relaxation rates, dephasing due to electron collisions at the nanocluster surface, effects of local structural order, changes in the saturation parameter due to chemical modification of the substrate, and one-and two-dimensional heat-transfer effects. C1 VANDERBILT UNIV,FREE ELECTRON LASER CTR BIOMED & MAT RES,NASHVILLE,TN 37235. VANDERBILT UNIV,DEPT APPL & ENGN SCI,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,DIV SOLID STATE PHYS,OAK RIDGE,TN 37831. TOKYO INST TECHNOL,ENGN MAT RES LAB,YOKOHAMA,KANAGAWA,JAPAN. RP Yang, L (reprint author), VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235, USA. RI Hosono, Hideo/J-3489-2013 OI Hosono, Hideo/0000-0001-9260-6728 NR 37 TC 69 Z9 71 U1 1 U2 12 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD MAY PY 1996 VL 62 IS 5 BP 403 EP 415 DI 10.1007/BF01567111 PG 13 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA UH923 UT WOS:A1996UH92300002 ER PT J AU Worden, EF AF Worden, EF TI John George Conway: May 16, 1922, to September 26, 1995 - Obituary SO APPLIED SPECTROSCOPY LA English DT Item About an Individual RP Worden, EF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD MAY PY 1996 VL 50 IS 5 BP 693 EP 693 PG 1 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA UM065 UT WOS:A1996UM06500025 ER PT J AU Seol, SY Askew, TR Cha, YS AF Seol, SY Askew, TR Cha, YS TI Experimental and analytical investigation of dissipation and heating in a YBCO filament SO APPLIED SUPERCONDUCTIVITY LA English DT Article ID CRITICAL CURRENTS; SUPERCONDUCTORS AB We measured the onset of heating in a YBCO filament between 64 and 92 K with a current pulsing system. The experimental data show that the current at the onset of heating is greater by a factor of at least two than the measured critical current defined by the 1 mu V/cm criteria. We show analytically that the voltage drop in the flux-flow regime depends not only on the current but also on d rho(ff)/dT and dJ(c)/dT, where rho(ff) is the flux-flow resistivity and J(c) is the critical current density of the superconductor. A model of current density distribution is incorporated in the numerical solution of the heat conduction equation to predict the onset of heating in the flux-flow regime. The numerical model is capable of predicting the trend of the experimental data from 64 to 85 K. Above 85 K, the experimental data indicate that the superconductor is in a transition state between the flux-flow state and the normal state. The relevance of the issue of onset of heating in practical applications is discussed. Published by Elsevier Science Ltd. C1 KALAMAZOO COLL,DEPT PHYS,KALAMAZOO,MI 49006. ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP Seol, SY (reprint author), CHONNAM NATL UNIV,DEPT MECH ENGN,KWANGJU 500757,SOUTH KOREA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD MAY-JUN PY 1996 VL 4 IS 5-6 BP 231 EP 240 DI 10.1016/S0964-1807(97)00006-9 PG 10 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA XP029 UT WOS:A1996XP02900003 ER PT J AU Ponnusamy, D Coulter, Y Daugherty, M RaviChandar, K Salama, K AF Ponnusamy, D Coulter, Y Daugherty, M RaviChandar, K Salama, K TI Processing of BSCCO superconducting rods for current leads SO APPLIED SUPERCONDUCTIVITY LA English DT Article ID PHASE AB Current leads made of ceramic superconductors promise to be one of the first applications of these materials. The high critical temperature and low thermal conductivity of ceramic superconductors make them suitable for current leads in low T-c devices. Rods and tubes of BSCCO were fabricated using Cold Isostatic Pressing (CIP). The platelet morphology of BSCCO was utilized to process rods with a high degree of preferred orientation using suitably designed cans for cold isostatic pressing. The effect of starting powder, processing parameters, and loading configuration were studied and an optimum processing cycle was developed. Rods with consistent current capacities of several hundred amperes over 15 cm have been fabricated using this technique. In addition, the critical currents of these rods were measured at various temperatures and magnetic fields and found to be very satisfactory for current lead applications. (C) 1997 Elsevier Science Ltd. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Ponnusamy, D (reprint author), UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204, USA. RI Ravi-Chandar, Krishnaswamy/D-9246-2011 NR 7 TC 2 Z9 2 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD MAY-JUN PY 1996 VL 4 IS 5-6 BP 247 EP 252 DI 10.1016/S0964-1807(97)00001-X PG 6 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA XP029 UT WOS:A1996XP02900005 ER PT J AU Mack, WJ Krauss, RM Hodis, HN AF Mack, WJ Krauss, RM Hodis, HN TI Lipoprotein subclasses in the monitored atherosclerosis regression study (MARS) - Treatment effects and relation to coronary angiographic progression SO ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY LA English DT Article DE triglyceride-rich lipoproteins; coronary angiography; angiographic trials; lipoprotein subclasses; coronary artery disease ID INTERMEDIATE-DENSITY LIPOPROTEINS; ARTERY DISEASE; MYOCARDIAL-INFARCTION; MORPHOMETRIC ANALYSIS; CHOLESTEROL; THERAPY; RISK; MEN; SUBFRACTIONS; ASSOCIATION AB Accumulating evidence suggests that triglyceride-rich lipoproteins contribute to coronary artery disease. Using data from the Monitored Atherosclerosis Regression Study, an angiographic trial of middle-aged men and women randomized to lovastatin or placebo, we investigated relationships between lipoprotein subclasses and progression of coronary artery atherosclerosis. Coronary artery lesion progression was determined by quantitative coronary angiography in low-grade (<50% diameter stenosis), high-grade (greater than or equal to 50% diameter stenosis), and all coronary artery lesions in 220 baseline/2-year angiogram pairs. Analytical ultracentrifugation was used to measure lipoprotein masses that were statistically evaluated for treatment group differences and relationships to progression of coronary artery atherosclerosis. All low density lipoprotein (LDL), intermediate density lipoprotein (IDL). and very low density lipoprotein (VLDL) masses were significantly lowered and all high density lipoprotein (HDL) masses were significantly raised with lovastatin therapy. The mass of smallest LDL (Svedberg flotation rate [S-f] 0 to 3), IDL (S-f, 12 to 20), all VLDL subclasses (S-f 20 to 60, S-f 60 to 100, and S-f 100 to 400), and peak LDL flotation rate were significantly related to the progression of coronary artery lesions, specifically low-grade lesions. Greater baseline levels of HDL(3), were related to a lower likelihood of coronary artery lesion progression. In multivariate analyses, small VLDL (S-f 20 to 60) and HDL(3) mass were the most important correlates of coronary artery lesion progresssion. These results provide further evidence for the importance of triglyceride-rich lipoproteins in the progression of coronary artery disease. In addition, these results present new evidence for the possible protective role of HDL(3) in the progression of coronary artery lesions. More specific information coronary artery lesion progression may be obtained through the study of specific apolipoprotein B-containing lipoproteins. C1 UNIV SO CALIF,SCH MED,DEPT MED,DIV CARDIOL,ATHEROSCLEROSIS RES UNIT,LOS ANGELES,CA 90033. UNIV SO CALIF,SCH MED,STAT CONSULTAT & RES CTR,DEPT PREVENT MED,LOS ANGELES,CA 90033. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. FU NHLBI NIH HHS [NHLBI-RO1-HL-49885, HL-18574] NR 31 TC 145 Z9 148 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1079-5642 J9 ARTERIOSCL THROM VAS JI Arterioscler. Thromb. Vasc. Biol. PD MAY PY 1996 VL 16 IS 5 BP 697 EP 704 PG 8 WC Hematology; Peripheral Vascular Disease SC Hematology; Cardiovascular System & Cardiology GA UK782 UT WOS:A1996UK78200012 PM 8963728 ER PT J AU Breger, M Handler, G Serkowitsch, E Reegen, P Provencal, J Wood, MA Clemens, JC OBrien, MS Winget, DE Nather, RE Kleinman, SJ Kanaan, A Watson, TK Montgomery, MH Bradley, PA Sullivan, DJ Leibowitz, E Mendelson, H Krzesinski, J Pajdosz, G Moskalik, P Solheim, JE AF Breger, M Handler, G Serkowitsch, E Reegen, P Provencal, J Wood, MA Clemens, JC OBrien, MS Winget, DE Nather, RE Kleinman, SJ Kanaan, A Watson, TK Montgomery, MH Bradley, PA Sullivan, DJ Leibowitz, E Mendelson, H Krzesinski, J Pajdosz, G Moskalik, P Solheim, JE TI The delta Scuti star FG Virginis .2. A search for high pulsation frequencies SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE stars, delta Scuti; stars, oscillations; stars, individual, HD 106384 = FG Vir AB Although the delta Scuti and roAp variables occupy similar positions on and near the main sequence, delta Scuti variables pulsate with lower radial and nonradial overtones and lower frequencies. To test whether high frequencies (as found in the roAp stars) are also present in delta Scuti stars, a multisite campaign with the Whole Earth Telescope (WET) was carried out for the star FG Vir. The 96.7 hours of WET photometry were supplemented by measurements made with the Delta Scuti Network (DSN), because the DSN technique includes regular measurements of comparison stars and is better suited to monitoring the low frequencies (less than or equal to 500 mu Hz). This made possible the correction for low-frequency variability (10 pulsation frequencies from 106 to 395 mu Hz and amplitudes from 0.001 to 0.02) in order to prevent spectral leakage into the high-frequency domain. It is shown that such a correction is essential. In the 1 - 10 mHz region of interest (corresponding to periods between 17 and 1.7 minutes) no significant stellar variability could be detected. The highest peaks in the amplitude spectra ranged from 0.00023 (near 1 mHz) to 0.00012 near 10 mHz, where the amplitudes are expressed in units of fractional intensity. Statistical tests show that these peaks are caused by noise. These results indicate that for FG Vir the multimode pulsations in the low-frequency region (with individual amplitudes up to 0.02) are not accompanied by photometrically detectable high overtone pulsation at high frequencies. This result is consistent with the hypothesis that high-order p-mode pulsations in the millimag range require a large magnetic field, as detected in the roAp stars. C1 UNIV DELAWARE, DEPT PHYS & ASTRON, NEWARK, DE 19716 USA. FLORIDA INST TECHNOL, DEPT PHYS & SPACE SCI, MELBOURNE, FL 32901 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50211 USA. UNIV TEXAS, DEPT ASTRON, AUSTIN, TX 78712 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. VICTORIA UNIV WELLINGTON, DEPT PHYS, WELLINGTON, NEW ZEALAND. TEL AVIV UNIV, SACKLER FAC EXACT SCI, WISE OBSERV, IL-69978 TEL AVIV, ISRAEL. CRACOW PEDAGOG UNIV, MT SUHORA OBSERV, PL-30083 KRAKOW, POLAND. COPERNICUS ASTRON CTR, PL-00716 WARSAW, POLAND. UNIV TROMSO, AURORAL OBSERV, INST MATH & PHYS SCI, N-9037 TROMSO, NORWAY. RP Breger, M (reprint author), UNIV VIENNA, INST ASTRON, TURKENSCHANZSTR 17, A-1180 VIENNA, AUSTRIA. NR 11 TC 14 Z9 14 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD MAY PY 1996 VL 309 IS 1 BP 197 EP 202 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA UK343 UT WOS:A1996UK34300028 ER PT J AU Justtanont, K Barlow, MJ Skinner, CJ Roche, PF Aitken, DK Smith, CH AF Justtanont, K Barlow, MJ Skinner, CJ Roche, PF Aitken, DK Smith, CH TI Mid-infrared spectroscopy of carbon-rich post-AGB objects and detection of the PAH molecule chrysene SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE stars, post-AGB; circumstellar matter; dust; molecular data ID PROTO-PLANETARY-NEBULAE; M STELLAR SPECTROPHOTOMETRY; EMISSION FEATURES; CIRCUMSTELLAR SHELLS; IRAS SOURCES; STARS; SPECTRA; DUST; BANDS; SUPERGIANTS AB We present 10 and 20-mu m spectroscopic observations of a sample of F- and C-type carbon-rich post-AGE objects, three of which were known to exhibit the unidentified emission feature at 21 mu m. We also find the F3I post-AGE object SAO 163075 to exhibit a (weak) 21-mu m emission feature. We additionally obtained a 10-mu m spectrum of IRAS 05341+0852, which has been reported to have a possible 21-mu m emission band in its IRAS LRS spectrum, and obtained new 10 and 20-mu m spectra of the carbon-rich bipolar post-AGE sources GL 2688 and GL 618, the extreme carbon star GL 3068, and the planetary nebulae IRAS 21282+5050 and He 2-447, in order to study the evolution of C-rich dust from the early post-AGE through to the planetary nebula (PN) phases. The 7.5-13-mu m spectra of the 21-mu m band objects exhibit broad plateau emission, shortwards of 9 mu m and from 10-13 mu m, superposed upon which, in addition to the well-known UIR-band at 11.3 mu m, are several new features, at 7.9, 8.2, 10.6, 11.5 and 12.2 mu m, differing from those observed in standard UIR-band spectra. An excellent match is found between the wavelengths of these new features and those of bands in the spectrum of chrysene (C18H12), one of the simplest PAH molecules. The absence of the new features in the spectra of earlier spectral-type post-AGE objects and PN is consistent with the expected complete dehydrogenation of any PAH molecules having less than 20-25 carbon atoms when exposed to the ultraviolet radiation fields of stars with spectral types earlier than F. Chrysene is not responsible for the 21-mu m emission bands observed in the spectra of the cool post-AGE objects. Possible identifications for the 21-mu m band in terms of highly hydrogenated 2-dimensional PAH molecules or 3-dimensional fulleranes (hydrogenated fullerenes) are discussed, The mid-infrared spectrum of GL 2688 is largely featureless, apart from two broad weak emission features between 9.5-10.5 and 10.5-12.2 mu m. The profiles of the broad 10-13-mu m absorption features in the spectra of the extreme carbon star GL 3068 and the C-rich bipolar post-AGE object GL 618 are compared. For GL 3068 the profile shape and the wavelength of peak absorption, near 11 mu m, are consistent with absorption by silicon carbide particles. However, the absorption observed towards GL 618 is considerably broader and peaks at 12 mu m. Its profile is very similar to that of the 10-13-mu m emission plateau observed in the spectra of the 21-mu m band objects, suggesting that it arises from absorption by a large column of highly-hydrogenated PAH-type species. C1 UCL, DEPT PHYS & ASTRON, LONDON WC1E 6BT, ENGLAND. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. INST ASTROPHYS PARIS, F-75014 PARIS, FRANCE. LAWRENCE LIVERMORE NATL LAB, INST GEOPHYS & PLANETARY PHYS, LIVERMORE, CA 94581 USA. UNIV OXFORD, DEPT PHYS, OXFORD OX1 3RH, ENGLAND. UNIV COLL, ADFA, DEPT PHYS, CAMPBELL, ACT 2600, AUSTRALIA. RI Barlow, Michael/A-5638-2009; OI Barlow, Michael/0000-0002-3875-1171; Roche, Patrick/0000-0002-8524-8413; /0000-0003-1689-9201 NR 67 TC 67 Z9 68 U1 0 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 1432-0746 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD MAY PY 1996 VL 309 IS 2 BP 612 EP 628 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA UK956 UT WOS:A1996UK95600031 ER PT J AU Larsson, M Lepp, S Dalgarno, A Stromholm, C Sundstrom, G Zengin, V Danared, H Kallberg, A afUgglas, M Datz, S AF Larsson, M Lepp, S Dalgarno, A Stromholm, C Sundstrom, G Zengin, V Danared, H Kallberg, A afUgglas, M Datz, S TI Dissociative recombination of H2D+ and the cosmic abundance of deuterium SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE atomic data; ISM, abundances; ISM, molecules ID INTERSTELLAR CLOUDS; FRACTIONATION; LINE AB Deuterated molecules in interstellar clouds constitute a unique source of information on three interstellar parameters: the deuterium/hydrogen abundance ratio [D]/[H], the fractional ionization in dense clouds, and the galactic ionizing flux (Dalgarno & Lepp 1984, Millar 1990). The molecular ion H2D+ plays a key role in the formation of deuterated molecules. Dissociative recombination with electrons is a major loss channel and a potential source of deuterium atoms. An ion storage ring has been used to obtain the total recombination rate coefficient, and the probabilities for decay into H+H+D, HD+H and H-2+D. Using them in a model of the cloud L1529 we derive from observational data on HCO+ and DCO+ an upper limit to the fractional ionization of 2 x 10(-6), a [D]/[H] ratio of 1.7 x 10(-5) and an atomic D/H ratio of 2.7 x 10(-3). C1 UNIV NEVADA, DEPT PHYS, LAS VEGAS, NV 89154 USA. HARVARD SMITHSONIAN CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA. UNIV STOCKHOLM, MANNE SIEGBAHN LAB, S-10405 STOCKHOLM, SWEDEN. OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. RP Larsson, M (reprint author), ROYAL INST TECHNOL, DEPT PHYS 1, S-10044 STOCKHOLM, SWEDEN. NR 18 TC 44 Z9 44 U1 0 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD MAY PY 1996 VL 309 IS 1 BP L1 EP L3 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA UK343 UT WOS:A1996UK34300001 ER PT J AU Atherton, CS Grotch, S Parrish, DD Penner, JE Walton, JJ AF Atherton, CS Grotch, S Parrish, DD Penner, JE Walton, JJ TI The role of anthropogenic emissions of NOx on tropospheric ozone over the North Atlantic Ocean: A three-dimensional, global model study SO ATMOSPHERIC ENVIRONMENT LA English DT Article; Proceedings Paper CT Joint 8th CACGP/2nd IGAC Conference on Global Atmospheric Chemistry CY SEP 05-09, 1994 CL FUJI, JAPAN SP Int Global Atmospher Chem Project, Commiss Atmospher Chem & Global Pollut DE Ozone; tropospheric chemistry; North Atlantic Ocean; nitrogen oxides; fossil fuel ID OBSERVATORY PHOTOCHEMISTRY EXPERIMENT; STRATOSPHERIC OZONE; BOUNDARY-LAYER; CLIMATE CHANGE; UNITED-STATES; ATMOSPHERE; NITRATE; EXPORT; BUDGET; IMPACT AB A three-dimensional, global tropospheric model is used to simulate the concentration of ozone over the North Atlantic Ocean over an annual cycle. Two scenarios, a baseline and one in which North American fossil fuel NOx emissions are reduced 50% are simulated. The largest decreases in O-3 are found in the summer months closest to the east coast of North America, presumably because of strong photochemical production and transport from the southwest due to the Bermuda High. Ozone decreases are also predicted for other North Atlantic Ocean sites and occur throughout the year, but tend to be smaller than those off North America. The total tropospheric mass of O-3 over a region from (2.2S, 82.5W) to (68.8N, 0) decreases by 1.8 Tg O-3 from 41.3 to 39.5 Tg O-3 when North American NOx fossil fuel emissions are reduced, or roughly 4.4%. Given recent estimates of the export of North American O-3 to the global atmosphere, the 50% fossil fuel NOx reduction corresponds to a 30% reduction in the total mass of tropospheric O-3 exported from North America to the North Atlantic Ocean. Nonlinearities may be due to the fact that ozone production potential per unit NOx increases as NOx concentrations decrease. RP Atherton, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,GLOBAL CLIMATE RES DIV,L-262,LIVERMORE,CA 94550, USA. RI Parrish, David/E-8957-2010; Penner, Joyce/J-1719-2012 OI Parrish, David/0000-0001-6312-2724; NR 61 TC 8 Z9 8 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD MAY PY 1996 VL 30 IS 10-11 BP 1739 EP 1749 DI 10.1016/1352-2310(95)00391-6 PG 11 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA UH179 UT WOS:A1996UH17900022 ER PT J AU Fabian, P Borchers, R Leifer, R Subbaraya, BH Lal, S Boy, M AF Fabian, P Borchers, R Leifer, R Subbaraya, BH Lal, S Boy, M TI Global stratospheric distribution of halocarbons SO ATMOSPHERIC ENVIRONMENT LA English DT Article; Proceedings Paper CT Joint 8th CACGP/2nd IGAC Conference on Global Atmospheric Chemistry CY SEP 05-09, 1994 CL FUJI, JAPAN SP Int Global Atmospher Chem Project, Commiss Atmospher Chem & Global Pollut DE halocarbons; stratosphere; cryogenics ID GROWTH-RATES; DECREASE AB A 16 yr database of stratospheric halocarbon profiles obtained by cryogenic whole air sampling and subsequent trace gas analyses is presented. Twenty-eight balloon ascents of cryogenic samplers were carried out at 44 degrees N, supplemented by 2 balloon flights at 17.5 degrees N and 3 flights at 69 degrees N, between 1977 and 1993. The resultant vertical profiles of CCl4, CCl3F, CCl2F2, CClF3, CF4, CCl2FCClF2, CClF2CClF2, CClF2CF3, CF3CF3, CH3Cl, CHClF2, CH3CCl3, CBrClF2 and CBrF3 were averaged using relative values with respect to tropospheric mixing ratios, yielding reference profiles for middle, low and high northern latitudes. In addition, latitude-altitude cross-sections of CCl3F, CCl2F2, and CH3CCl3 derived from the balloon data and additional aircraft data are shown for the northern hemisphere. C1 MAX PLANCK INST AERON,D-37191 KATLENBURG DUHM,GERMANY. US DOE,ENVIRONM MEASUREMENTS LAB,NEW YORK,NY 10014. PHYS RES LAB,AHMEDABAD 380009,GUJARAT,INDIA. RP Fabian, P (reprint author), UNIV MUNICH,LEHRSTUHL BIOKLIMATOL & IMMISS FORSCH,HOHENBACHERNSTR 22,D-85354 FREISING,GERMANY. RI Boy, Michael/C-2920-2015 OI Boy, Michael/0000-0002-8107-4524 NR 21 TC 26 Z9 26 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD MAY PY 1996 VL 30 IS 10-11 BP 1787 EP 1796 DI 10.1016/1352-2310(95)00387-8 PG 10 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA UH179 UT WOS:A1996UH17900027 ER PT J AU Han, XL Wu, CL AF Han, XL Wu, CL TI Nuclear superdeformation data tables SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID SPIN ALIGNMENT; LINKING TRANSITIONS; IDENTICAL BANDS; HG NUCLEI; INERTIA; STATES; SYMMETRY; MOMENTS; MODEL AB This paper updates our earlier compilation of nuclear superdeformation data published in ATOMIC DATA AND NUCLEAR DATA TABLES 52, 43 (1992). The present tables list the measured gamma-transition energies E(gamma) of 131 nuclear superdeformed bands for 51 nuclei found in the mass-80, -130, -140, -150, and -190 regions. Data were collected up to July, 1995. The corresponding rotational frequencies omega, dynamical moments of inertia J((2)), tentatively suggested spin assignments I, associated static moments of inertia J((1)), and available transition quadrupole moments Q(t) (or average moments Q(o)), M1 or E1 interband transition energies, and g-factors are also tabulated. For the user's convenience, a plot of J((1)) and J((2)) versus rotational frequency omega is given with the data table for each superdeformed band. (C) 1996 Academic Press, Inc. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. RP Han, XL (reprint author), CHUNG YUAN CHRISTIAN UNIV,DEPT PHYS,CHUNGLI 32023,TAIWAN. NR 29 TC 41 Z9 44 U1 1 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD MAY PY 1996 VL 63 IS 1 BP 117 EP 186 DI 10.1006/adnd.1996.0011 PG 70 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA UJ493 UT WOS:A1996UJ49300004 ER PT J AU Carstensen, HH Rehbein, C Wagner, HG AF Carstensen, HH Rehbein, C Wagner, HG TI The reactions of (CH2)-C-1((a)over-tilde(1)A(1)) with C2HxF4-x (x=0,2,3,4) and 1,1-C2HF2Cl SO BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article DE chemical kinetics; elementary reactions; photochemistry; radicals ID REMOVAL RATES; HYDROCARBONS; CH2(A1A1) AB The rate constants of the reactions of (CH2)-C-1 with C2H4, CH2=CF2, CHF=CHF, CF2=CHF, C2F4, and CF2=CHCl were investigated with a laser photolysis/laser induced fluorescence apparatus at room temperature 2 under quasistationary conditions. (CH2)-C-1 was produced via photolysis of ketene. The obtained rate constants show a regular dependence on the amount of fluorine substitution: an increasing fluorine part leads to a decrease of the overall rate constant. This also holds for CF2=CHCl, which shows nearly the same reactivity towards (CH2)-C-1 as CF2=CHF does. Some of the investigated reactions were measured for both (CH2)-C-1(v=0) and (CH2)-C-1(v=1). The obtained rate constants are very similar. In the reactions of (CH2)-C-1 with CH2=CF2, CF2=CHF and C2F4 the radical (CF2)-C-1 could be detected as a reaction product. In the (CH2)-C-1 reactions with CHF=CHF and CF2=CHF the radical (CHF)-C-1 could be observed. These results underline the importance of the addition channel for this kind of reactions. C1 SANDIA NATL LABS, LIVERMORE, CA 94551 USA. RP Carstensen, HH (reprint author), MAX PLANCK INST STROMUNGSFORSCH, BUNSENSTR 10, D-37073 GOTTINGEN, GERMANY. NR 19 TC 2 Z9 2 U1 0 U2 0 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY SN 0005-9021 J9 BER BUNSEN PHYS CHEM JI Ber. Bunsen-Ges. Phys. Chem. Chem. Phys. PD MAY PY 1996 VL 100 IS 5 BP 521 EP 527 PG 7 WC Chemistry, Physical SC Chemistry GA UP013 UT WOS:A1996UP01300001 ER PT J AU Holmes, RM Jones, JB Fisher, SG Grimm, NB AF Holmes, RM Jones, JB Fisher, SG Grimm, NB TI Denitrification in a nitrogen-limited stream ecosystem SO BIOGEOCHEMISTRY LA English DT Article DE denitrification; stream ecology; nutrient dynamics; nitrification; hyporheic zone; parafluvial zone ID HYPORHEIC ZONE; SEASONAL-VARIATION; NITRATE; EXCHANGE; METABOLISM; PARAMETERS; INHIBITION; ACETYLENE; REDUCTION; LOSSES AB Denitrification was measured in hyporheic, parafluvial, and bank sediments of Sycamore Creek, Arizona, a nitrogen-limited Sonoran Desert stream. We used three variations of the acetylene block technique to estimate denitrification rates, and compared these estimates to rates of nitrate production through nitrification. Subsurface sediments of Sycamore Creek are typically well-oxygenated, relatively low in nitrate, and low in organic carbon, and therefore are seemingly unlikely sites of denitrification. However, we found that denitrification potential (C & N amended, anaerobic incubations) was substantial, and even by our conservative estimates (unamended, oxic incubations and field chamber nitrous oxide accumulation), denitrification consumed 5-40% of nitrate produced by nitrification. We expected that denitrification would increase along hyporheic and parafluvial flowpaths as dissolved oxygen declined and nitrate increased. To the contrary, we found that denitrification was generally highest at the upstream ends of subsurface flowpaths where surface water had just entered the subsurface zone. This suggests that denitrifiers may be dependent on the import of surface-derived organic matter, resulting in highest denitrification rate at locations of surface-subsurface hydrologic exchange. Laboratory experiments showed that denitrification in Sycamore Creek sediments was primarily nitrogen limited and secondarily carbon limited, and was temperature dependent. Overall, the quantity of nitrate removed from the Sycamore Creek ecosystem via denitrification is significant given the nitrogen-limited status of this stream. C1 MARINE BIOL LAB,CTR ECOSYST,WOODS HOLE,MA 02543. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI Grimm, Nancy/D-2840-2009 OI Grimm, Nancy/0000-0001-9374-660X NR 53 TC 143 Z9 148 U1 4 U2 40 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-2563 J9 BIOGEOCHEMISTRY JI Biogeochemistry PD MAY PY 1996 VL 33 IS 2 BP 125 EP 146 DI 10.1007/BF02181035 PG 22 WC Environmental Sciences; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Geology GA UT832 UT WOS:A1996UT83200003 ER PT J AU Dimri, GP Testori, A Acosta, M Campisi, J AF Dimri, GP Testori, A Acosta, M Campisi, J TI Replicative senescence, aging and growth-regulatory transcription factors SO BIOLOGICAL SIGNALS LA English DT Article DE senescent cells; cell proliferation; AP-1; c-jun; QM; Id proteins; helix-loop-helix proteins, basic E2F; retinoblastoma proteins ID CELL-CYCLE CONTROL; HUMAN-FIBROBLASTS; TUMOR-SUPPRESSOR; GENE-EXPRESSION; PROTEIN; DNA; JUN; PROGRESSION; CULTURE; COMPLEX AB Normal somatic cells invariably enter a state of permanent growth arrest and altered function after a finite number of divisions. This phenomenon is termed cellular or replicative senescence Replicative senescence is thought to be a tumor-suppressive mechanism, and a contributing factor In aging. Three features distinguish senescent from presenescent cells. an irreversible block to cell proliferation, increased resistance to apoptotic death. and chances in differentiated functions. Senescence entails an altered pattern of gene expression, much of which is due to altered transcription. At least three growth regulatory transcriptional modulators are repressed in senescent cells: the c-fos component of the AP1 transcription factor, the Id1 and Id2 helix-loop-helix (HLH) proteins that negatively regulate basic HLH transcription Factors, and the E2F-1 component of the E2F transcription factor. Failure to express any one of these modulators is very likely sufficient to arrest cell proliferation. Loss of these modulators may also explain many of the functional changes shown by senescent cells. In the case of c-fos repression, the resulting decline in AP-1 activity may be exacerbated by an altered ratio of AP-1 components to a protein known as QM or Jif. QM interacts with the c-jun component of AP-1 and suppresses AP-1 activity. We cloned QM from a senescent fibroblast cDNA library, and found that it was neither cell cycle- nor senescence-regulated. However, QM suppressed the growth of murine and human fibroblasts when overexpressed. Thus, an altered balance between positive factors (e.g., AP-1 components) and negative factors (e.g., QM) may lead to the growth arrest, as well as the changes in differentiated gene expression, that are a hallmark of senescent cells. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CANC BIOL,BERKELEY,CA 94720. FU NIA NIH HHS [AG11658] NR 35 TC 50 Z9 55 U1 0 U2 0 PU KARGER PI BASEL PA ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND SN 1016-0922 J9 BIOL SIGNAL JI Biol. Signals PD MAY-JUN PY 1996 VL 5 IS 3 BP 154 EP 162 PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA VE292 UT WOS:A1996VE29200004 PM 8864060 ER PT J AU Costa, V Boopathy, R Manning, J AF Costa, V Boopathy, R Manning, J TI Isolation and characterization of a sulfate-reducing bacterium that removed TNT (2,4,6-trinitrotoluene) under sulfate- and nitrate-reducing conditions SO BIORESOURCE TECHNOLOGY LA English DT Article DE sulfate-reducing bacteria; bioremediation; electron acceptor; TNT; metabolites; butyric acid ID SP B-STRAIN; DESULFOVIBRIO SP; MICROBIAL TRANSFORMATION; NITROAROMATIC COMPOUNDS; METHANOGENIC BACTERIA; GROWTH; METABOLISM; REDUCTION AB A sulfate-reducing bacterium isolated from a creek sediment and capable of metabolizing TNT (2,4,6-trinitrotoluene) using sulfate and nitrate as electron accepters was tentatively characterized as Desulfovibrio desulfuricans strain A. The isolate was unable to use TNT as the sole source of carbon. TNT degradation was accomplished by a co-metabolic process using pyruvate as the main substrate. Two different metabolic steps were employed by this isolate under different electron-accepting conditions. Under sulfate-reducing conditions, TNT was reduced to 4-amino-2,6-dinitrotoluene, 2-amino-4,6-dinitrotoluene and 2,4-diamino-6-nitrotoluene. In contrast, under nitrate-reducing conditions, these amino compounds were not produced, instead butyric acid was identified as the major metabolite of TNT metabolism. This organism also used a wide variety of other carbon sources, including ethanol lactate, succinate, formate and malate. The isolate contained the electron-carrier desulfoviridin and used sulfate, nitrate, and thiosulfate as electron acceptors. The isolate had an optimal temperature of 25 degrees C and an optimal pH of 6.8 and used ammonium chloride, nitrate and glutamate as nitrogen sources. The characteristic features of the sulfate-reducing bacterium closely resembled those of Desulfovibrio desulfuricans. Copyright (C) 1996 Elsevier Science Ltd. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. NR 20 TC 12 Z9 12 U1 1 U2 4 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0960-8524 J9 BIORESOURCE TECHNOL JI Bioresour. Technol. PD MAY-JUN PY 1996 VL 56 IS 2-3 BP 273 EP 278 DI 10.1016/0960-8524(96)00046-6 PG 6 WC Agricultural Engineering; Biotechnology & Applied Microbiology; Energy & Fuels SC Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels GA VG117 UT WOS:A1996VG11700019 ER PT J AU Vulliet, R AF Vulliet, R TI Improved technique for the preparation of water-in-oil emulsions containing protein antigens SO BIOTECHNIQUES LA English DT Article ID TYROSINE-HYDROXYLASE RP Vulliet, R (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT MOL BIOSCI,DAVIS,CA 95616, USA. FU NINDS NIH HHS [NS 28765] NR 5 TC 10 Z9 11 U1 0 U2 0 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD MAY PY 1996 VL 20 IS 5 BP 797 EP & PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UJ638 UT WOS:A1996UJ63800014 PM 8723921 ER PT J AU Klasson, KT Barton, JW Evans, BS Reeves, ME AF Klasson, KT Barton, JW Evans, BS Reeves, ME TI Reductive microbial dechlorination of indigenous polychlorinated biphenyls in soil using a sediment-free inoculum SO BIOTECHNOLOGY PROGRESS LA English DT Article ID ANAEROBIC MICROORGANISMS AB In laboratory experiments, unagitated soil slurry bioreactors inoculated with micro-organisms extracted from polychlorinated biphenyl-contaminated (PCBs) sediments from the Hudson River were used to anaerobically dechlorinate PCBs. The onset of dechlorination activity was accelerated by the addition of certain organic acids (pyruvate and maleate) and single congeners (2,3,6-trichlorobiphenyl). Dechlorination was observed under several working conditions after 19 weeks of incubation with PCB-contaminated soil and nutrient solution. Best results showed a drop in average chlorine content from 4.3 to 3.6 chlorines per biphenyl due to a lass of m-chlorines. Soil used for these experiments was obtained from a PCB-contaminated (weathered Aroclor 1248) site at an electric power substation. Dechlorination was observed with no sediment particles or other matrix being added. RP Klasson, KT (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831, USA. OI Klasson, K. Thomas/0000-0003-3358-3081 NR 17 TC 17 Z9 19 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 8756-7938 J9 BIOTECHNOL PROGR JI Biotechnol. Prog. PD MAY-JUN PY 1996 VL 12 IS 3 BP 310 EP 315 DI 10.1021/bp960019z PG 6 WC Biotechnology & Applied Microbiology; Food Science & Technology SC Biotechnology & Applied Microbiology; Food Science & Technology GA UP645 UT WOS:A1996UP64500004 PM 8652118 ER PT J AU GuanSajonz, H Sajonz, P Zhong, GM Guiochon, G AF GuanSajonz, H Sajonz, P Zhong, GM Guiochon, G TI Study of the mass transfer kinetics of BSA on a TSK-GEL DEAE-5PW anion exchanger in a wide concentration range SO BIOTECHNOLOGY PROGRESS LA English DT Article ID PERFORMANCE LIQUID-CHROMATOGRAPHY; CONCENTRATION-DEPENDENCE; ADSORPTION BEHAVIOR; LIGHT-SCATTERING; BAND PROFILES; PROTEINS; SEPARATION; DIFFUSION AB The adsorption isotherms of bovine serum albumin (BSA) on TOSOHAAS TSK-GEL DEAE-5PW were determined in a pH = 7.5 buffer for a 1.0 mL/min flow rate and at pH 6.0 for 1.0, 2.0, and 3.0 mL/min flow rates. The isotherm data were derived from the breakthrough curves obtained by step series frontal analysis (FA) method. The sample concentrations ranged from ca. 0.2 to 3 mg/mL. From the Scatchard plots, it was found that the bi-langmuir isotherm model fits the adsorption isotherm data better than the single Langmuir isotherm model at both pH = 7.5 and 6.0, for flow rates up to 2.0 mL/min. The rate of the mass transfer kinetics was determined for each breakthrough curve by using a lumped kinetic model. An average rate coefficient of mass transfer kinetics was derived. This rate coefficient depends linearly on the average sample concentration. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. UNIV SAARLAND,D-66123 SAARBRUCKEN,GERMANY. NR 25 TC 41 Z9 41 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 8756-7938 J9 BIOTECHNOL PROGR JI Biotechnol. Prog. PD MAY-JUN PY 1996 VL 12 IS 3 BP 380 EP 386 DI 10.1021/bp960025v PG 7 WC Biotechnology & Applied Microbiology; Food Science & Technology SC Biotechnology & Applied Microbiology; Food Science & Technology GA UP645 UT WOS:A1996UP64500013 ER PT J AU Rose, KA Tyler, JA Chambers, RC KleinMacPhee, G Danila, DJ AF Rose, KA Tyler, JA Chambers, RC KleinMacPhee, G Danila, DJ TI Simulating winter flounder population dynamics using coupled individual-based young-of-the-year and age-structured adult models SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID EARLY-LIFE STAGES; PLEURONECTES-PLATESSA POPULATION; BLUEGILL LEPOMIS-MACROCHIRUS; WESTERN WADDEN SEA; PSEUDOPLEURONECTES-AMERICANUS; STRIPED BASS; NARRAGANSETT BAY; MARINE FISHES; LARVAL FISH; REPRODUCTIVE SUCCESS AB Population dynamics of winter flounder (Pleuronectes americanus) are simulated using a detailed individual-based model for young-of-the-year coupled to an age-structured matrix model for adults. When run alone, the young-of-the-year model is initiated with user-specified female spawners. When coupled to the adult model, multiple-year simulations are performed with young-of-the-year survivors inputted to the adult model and the adult model is used to generate the female spawners each year. Model predictions of young-of-the-year densities, growth rates, and mortality rates were within the range observed for the Niantic River population. Model predictions and Niantic River data both showed recruitment (survivors to age 1) to level off at high numbers of spawners. Predicted recruitment at high numbers of spawners was two to three times that for the same conditions under density independence. Analysis of a 200-year simulation indicated that recruitment was largely set by metamorphosis, with density-dependent growth and survival rates operating during the larval and juvenile life stages. The relationship of our modelling approach to previous approaches, the implications of our results to understanding winter flounder population dynamics, and possible further elaborations of the model are discussed. C1 HUNSTMAN MARINE CTR, ST ANDREWS, NB E0G 2X0, CANADA. UNIV RHODE ISL, GRAD SCH OCEANOG, NARRAGANSETT, RI 02882 USA. NE UTIL ENVIRONM LAB, WATERFORD, CT 06385 USA. RP Rose, KA (reprint author), OAK RIDGE NATL LAB, DIV ENVIRONM SCI, POB 2008, MS-2036, OAK RIDGE, TN 37831 USA. NR 96 TC 37 Z9 38 U1 1 U2 2 PU CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS PI OTTAWA PA 65 AURIGA DR, SUITE 203, OTTAWA, ON K2E 7W6, CANADA SN 0706-652X EI 1205-7533 J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD MAY PY 1996 VL 53 IS 5 BP 1071 EP 1091 DI 10.1139/cjfas-53-5-1071 PG 21 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA VM910 UT WOS:A1996VM91000013 ER EF