FN Thomson Reuters Web of Science™ VR 1.0 PT J AU NITAO, JJ BUSCHECK, TA CHESNUT, DA AF NITAO, JJ BUSCHECK, TA CHESNUT, DA TI IMPLICATIONS OF EPISODIC NONEQUILIBRIUM FRACTURE-MATRIX FLOW ON REPOSITORY PERFORMANCE SO NUCLEAR TECHNOLOGY LA English DT Article DE NUCLEAR WASTE REPOSITORY; UNSATURATED FRACTURE FLOW HYDROLOGY; NONISOTHERMAL VADOSE ZONE HYDROLOGY ID YUCCA MOUNTAIN; POROUS-MEDIUM; FLUID-FLOW; NEVADA AB Some of the possible water transport mechanisms through fractured rock in the unsaturated zone at Yucca Mountain are studied to analyze the performance of a high-level nuclear repository at the potential Yucca Mountain site. Analysis shows that water can flow infractures as opposed to flow through the rock matrix if the incoming flux and the fracture aperture size exceed critical values. The rock matrix does not have to be nearly saturated for fracture flow to occur because the fractures and matrix can be in capillary disequilibrium during transient episodic infiltration events. As an example, the type of flow, fracture or matrix, is calculated for vertical fractures in the hydrogeologic units at Yucca Mountain. The results affect such issues as natural and total system performance, site characterization activities, and site suitability determination. Also, the important differences between an unsaturated and a saturated site are pointed out. The traditional concepts of near-field, far-field, and disturbed zone become blurred when talking about the unsaturated zone. The heat of decay may have beneficial aspects for an unsaturated site. Current regulations containing such concepts such as ''ground-water travel time'' are not consistent with some of the physical processes inherent in an unsaturated system. RP NITAO, JJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,POB 808,LIVERMORE,CA 94550, USA. NR 36 TC 3 Z9 3 U1 0 U2 2 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 DEC PY 1993 VL 104 IS 3 BP 385 EP 402 PG 18 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MJ745 UT WOS:A1993MJ74500007 ER PT J AU BUSCHECK, TA NITAO, JJ AF BUSCHECK, TA NITAO, JJ TI REPOSITORY-HEAT-DRIVEN HYDROTHERMAL FLOW AT YUCCA MOUNTAIN .1. MODELING AND ANALYSIS SO NUCLEAR TECHNOLOGY LA English DT Article DE CONVECTIVE HEAT TRANSFER; HIGH-LEVEL NUCLEAR WASTE; MULTIPHASE POROUS MEDIA FLOW AB To safely and permanently store high-level nuclear waste, the potential Yucca Mountain repository site must mitigate the release and transport of radionuclides for tens of thousands of years. In the failure scenario of greatest concern, water would contact a waste package, accelerate its failure rate, and eventually transport radionuclides to the water table. Analyses have demonstrated that (a) the ambient hydrological system will be dominated by repository-heat-driven hydrothermal flow for tens of thousands of years and (b) the only significant source of liquid water is from nonequilibrium fracture flow, driven either by meteoric sources or by the condensation of repository-heat-driven flow of water vapor. For sub-boiling conditions, the infiltration of meteoric water and condensate drainage are controlled by the highly heterogeneous distribution of hydrological properties, while for above-boiling conditions, they are largely determined thermodynamically. In a concept called the ''extended-dry repository, '' the heat of radioactive decay generates a region of above-boiling temperatures around the repository, thereby extending the time before liquid water can contact a waste package. It is also found that the magnitude of repository-heat-driven, buoyant, liquid-phase convection in the saturated zone is more dependent on the total mass of emplaced spent nuclear fuel (SNF) than on the details of SNF emplacement, such as the areal power density (expressed in kilo watts per acre) or SNF age. RP BUSCHECK, TA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,POB 808,LIVERMORE,CA 94550, USA. NR 33 TC 33 Z9 33 U1 0 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 DEC PY 1993 VL 104 IS 3 BP 418 EP 448 PG 31 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MJ745 UT WOS:A1993MJ74500009 ER PT J AU BUSCHECK, TA NITAO, JJ WILDER, DG AF BUSCHECK, TA NITAO, JJ WILDER, DG TI REPOSITORY-HEAT-DRIVEN HYDROTHERMAL FLOW AT YUCCA MOUNTAIN .2. LARGE-SCALE IN-SITU HEATER TESTS SO NUCLEAR TECHNOLOGY LA English DT Article DE BUOYANT HEAT CONVECTION; HIGH-LEVEL NUCLEAR WASTE; NONISOTHERMAL MULTIPHASE POROUS MEDIA FLOW AB In situ heater tests are needed to provide an understanding of coupled geomechanical-hydrothermal-geochemical behavior in the engineered and natural barriers under repository thermal loadings and to support the validation of related numerical and conceptual models. Hypothesis testing can help focus characterization, modeling, and testing activities required to support model validation and build robust site suitability and licensing arguments. In situ heater tests can address the following hypotheses: (a) repository-driven heat flow is dominated by heat conduction; (b) a region of above-boiling temperatures surrounding the repository corresponds to the absence of liquid water at the waste package environment; (c) fracture density and connectivity are sufficient to promote rock dryout due to boiling and condensate shedding; (d) rewetting of the dryout zone lags significantly behind the end of the boiling period, and (e) large-scale, buoyant, gas-phase convection may eventually dominate moisture movement in the unsaturated zone. Because of limited time, some of the in situ tests will have to be accelerated relative to actual thermal loading conditions. The trade-offs between the limited test duration and generating hydrothermal conditions applicable to repository performance during the entire thermal loading cycle are examined, including heating (boiling and dryout) and cooldown (rewetting). For in situ heater tests to be applicable to actual repository conditions, a minimum heater test duration of 6 to 7 yr (including 4 yr of full-power heating) is required. The parallel use of highly accelerated, shorter duration tests may also provide timely information for the license application. RP BUSCHECK, TA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,POB 808,LIVERMORE,CA 94550, USA. NR 24 TC 11 Z9 11 U1 1 U2 1 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 DEC PY 1993 VL 104 IS 3 BP 449 EP 471 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MJ745 UT WOS:A1993MJ74500010 ER PT J AU NICHOLS, AL WESTERBERG, KW AF NICHOLS, AL WESTERBERG, KW TI MODIFICATION OF A THERMAL TRANSPORT CODE TO INCLUDE CHEMISTRY WITH THERMALLY CONTROLLED KINETICS SO NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS LA English DT Article ID FINITE-ELEMENT SIMULATION; PHASE-CHANGE AB A finite-element thermal transport code is modified to include the effects of chemistry with thermally controlled kinetics. There are two types of pathways for a chemical reaction in energy-temperature space: one resembles a phase change and the other resembles a burn. Effective heat capacity methods are robust and stable for phase-change calculations, while heat source methods give the best results for a burn. We propose an energy-conserving method that adapts to the heat release (or absorption) mechanism using either effective heat capacity or heat source ideas. The method is applied to two examples: a burn and a phase change. RP NICHOLS, AL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-282,LIVERMORE,CA 94550, USA. NR 18 TC 10 Z9 10 U1 0 U2 0 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7790 J9 NUMER HEAT TR B-FUND JI Numer Heat Tranf. B-Fundam. PD DEC PY 1993 VL 24 IS 4 BP 489 EP 509 DI 10.1080/10407799308955905 PG 21 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA MM078 UT WOS:A1993MM07800007 ER PT J AU RUGGIERO, AG AF RUGGIERO, AG TI NUCLEAR-FUSION OF PROTONS WITH IONS OF BORON SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article DE FUSION REACTORS AND THERMONUCLEAR POWER STUDIES AB This paper describes a method of extracting energy from the fusion events occurring between the collision of a beam of protons with a beam of ions of B-11. The two beams are circulating in separated and intersecting storage rings where they collide head-on in a common long-straight section. Requirements an the beam parameters in the collider are presented. Limitations due to space-charge forces are discussed; it is found necessary to provide beam-charge neutralization with electrons. The paper discusses also the effects of Coulomb scattering between particles of the same beam and in the opposing beams. Methods are proposed for controlling the electromagnetic interaction. RP RUGGIERO, AG (reprint author), BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NR 7 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 DEC PY 1993 VL 106 IS 12 BP 1959 EP 1963 DI 10.1007/BF02780602 PG 5 WC Physics, Particles & Fields SC Physics GA MW861 UT WOS:A1993MW86100028 ER PT J AU HOGAN, WJ MEIER, WR AF HOGAN, WJ MEIER, WR TI A LOWER-COST DEVELOPMENT PATH FOR HEAVY-ION FUSION SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article DE FUSION REACTORS AND THERMONUCLEAR POWER STUDIES ID DESIGN AB If two features of the inertial-fusion process are exploited successfully, they can lead to significantly lower costs for demonstrating the feasibility of commercial electric power production from this source of energy. First, fusion capsule ignition and burn physics are independent of reaction chamber size and hydrodynamically equivalent capsules can be designed to perform at small yield, exactly as they do at large yield. This means that an integrated test of all power plant components and feasibility tests of various reaction chamber concepts can be done at much smaller sizes (about 1-2 m first wall radius) and much lower powers (tens of MWs) than magnetic fusion development facilities such as ITER. Second, the driver, which is the most expensive component of currently conceived IFE development facilities, can be used to support more than one experimental target chamber/reactor (simultaneously and/or sequentially). These two factors lead to lower development facility costs, modular facilities, and the planning flexibility to spread costs over time or do several things in parallel and thus shorten the total time needed for development of inertial fusion energy (IFE). In this paper we describe the general features of heavy-ion fusion development plan that takes advantage of upgradable accelerators and the ability to test chambers and reactor systems at small scale in order to reduce development time and costs. C1 WJ SCHAFER ASSOCIATES INC, LIVERMORE, CA 94550 USA. RP HOGAN, WJ (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, LIVERMORE, CA 94550 USA. NR 8 TC 3 Z9 3 U1 1 U2 1 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 DEC PY 1993 VL 106 IS 12 BP 1971 EP 1982 DI 10.1007/BF02780604 PG 12 WC Physics, Particles & Fields SC Physics GA MW861 UT WOS:A1993MW86100030 ER PT J AU WINKELMAN, DL AHO, JM AF WINKELMAN, DL AHO, JM TI DIRECT AND INDIRECT EFFECTS OF PREDATION ON MOSQUITOFISH BEHAVIOR AND SURVIVAL SO OECOLOGIA LA English DT Article DE GAMBUSIA; ESOX; PREDATION; CANNIBALISM; INDIRECT EFFECTS ID HABITAT USE; SPECIES INTERACTIONS; CANNIBALISM; POPULATIONS; COMPETITION; PISCES; FISH; PREY AB Predation can have strong direct and indirect effects on the behavior of prey. We investigated whether predation by chain pickerel (Esox niger) caused adult eastern mosquitofish (Gambusia holbrooki) to alter their habitat use and whether pickerel predation influenced survival of adult and neonate mosquitofish. The number of adult mosquitofish using the riskier of three habitats was lowest when two predators occupied the risky habitat, intermediate in the treatment with one predator, and highest when no predators occurred there. More mosquitofish neonates survived high predation treatments than treatments lacking pickerel. We conclude that pickerel predation causes adult mosquitofish to shift to refuge habitats. The pattern of neonate survival suggests that adult habitat use may create a refuge from cannibalism for neonate mosquitofish, resulting in higher neonate survival in treatments with more pickerel. Hence, pickerel predation has a direct effect on adult mosquitofish behavior and a strong indirect effect on neonate survival. Both interspecific and intraspecific predation can effect prey populations and can interact to produce important indirect effects. C1 UNIV GEORGIA,SAVANAH RIVER ECOL LAB,ATHENS,GA 30602. RP WINKELMAN, DL (reprint author), UNIV GEORGIA,DEPT ZOOL,ATHENS,GA 30602, USA. NR 30 TC 15 Z9 15 U1 0 U2 8 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0029-8549 J9 OECOLOGIA JI Oecologia PD DEC PY 1993 VL 96 IS 3 BP 300 EP 303 DI 10.1007/BF00317497 PG 4 WC Ecology SC Environmental Sciences & Ecology GA MP012 UT WOS:A1993MP01200002 PM 28313642 ER PT J AU FUNSTEN, HO MCCOMAS, DJ BARRACLOUGH, BL AF FUNSTEN, HO MCCOMAS, DJ BARRACLOUGH, BL TI ULTRATHIN FOILS USED FOR LOW-ENERGY NEUTRAL ATOM IMAGING OF THE TERRESTRIAL MAGNETOSPHERE SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT SPIE Conference on Instrumentation for Planetary and Terrestrial Atmospheric Remote Sensing CY JUL, 1992 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; NEUTRAL ATOM DETECTION; CHARGE EXCHANGE; BEAM-FOIL INTERACTIONS ID THIN CARBON FOILS; IONS AB Magnetospheric imaging by remote detection of low-energy neutral atoms (LENAs) that are created by charge exchange between magnetospheric plasma ions and neutral geocoronal atoms has been proposed as a method to provide global information of magnetospheric dynamics. For LENA detection, carbon foils can be implemented to (1) ionize the LENAs and electrostatically remove them from the large background of solar UV scattered by the geocorona to which LENA detectors (e.g., microchannel plates) are sensitive and (2) generate secondary electrons to provide coincidence and/or LENA trajectory information. Quantification of LENA-foil interactions are crucial in defining LENA imager performance. We present equilibrium charge state and angular scatter distributions for 1- to 30-keV atomic hydrogen, helium, and oxygen transiting nominal 0.5 mug cm-2 carbon foils. Results obtained after coating the exit surface of foils with either aluminum or gold suggest that the intended alteration of the exit surface chemistry has no effect on the charge state distributions due to foil contamination from exposure to air. Angular scattering that results from the projectile-foil interaction is quantified and is shown to be independent of the charge state distribution. RP FUNSTEN, HO (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MS D466,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 22 TC 41 Z9 41 U1 0 U2 7 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD DEC PY 1993 VL 32 IS 12 BP 3090 EP 3095 DI 10.1117/12.149187 PG 6 WC Optics SC Optics GA ML621 UT WOS:A1993ML62100013 ER PT J AU HAWKINS, RJ MENYUK, CR AF HAWKINS, RJ MENYUK, CR TI EFFECT OF THE DETAILED RAMAN CROSS-SECTION ON SOLITON EVOLUTION SO OPTICS LETTERS LA English DT Article ID SELF-FREQUENCY SHIFT; OPTICAL FIBERS; PULSES AB The effect of the detailed Raman cross section on the evolution of ultrashort solitons is considered. It is shown that the gain contribution leads to the self-frequency shift, whereas the phase contribution, which is usually determined by use of the Kramers-Kronig relations, has little visible effect. This result is consistent with the hypothesis that solitons are robust in the presence of Hamiltonian deformations. C1 UNIV MARYLAND,DEPT ELECT ENGN,CATONSVILLE,MD 21228. RP HAWKINS, RJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 7 Z9 7 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD DEC 1 PY 1993 VL 18 IS 23 BP 1999 EP 2001 DI 10.1364/OL.18.001999 PG 3 WC Optics SC Optics GA MJ099 UT WOS:A1993MJ09900003 PM 19829471 ER PT J AU COMASKEY, B ALBRECHT, GF BEACH, RJ MORAN, BD SOLARZ, RW AF COMASKEY, B ALBRECHT, GF BEACH, RJ MORAN, BD SOLARZ, RW TI FLASH-LAMP-PUMPED LASER OPERATION OF ND(3+)Y2SIO5 AT 1.074-MU-M SO OPTICS LETTERS LA English DT Article ID YTTRIUM ORTHOSILICATE; NEODYMIUM AB Flash-lamp-pumped laser operation of Nd3+:Y2SiO5 by use of the Nd3+ F-4(3/2)-F-4(11/2) transition at 1.074 mum is obtained and compared with that from an identically pumped standard-doped Nd3+:YAG rod. Higher free-laser performance in Nd3+:Y2SiO5 is attributed to its higher doping. Approximately 2.5 times more energy in Q-switched pulses is generated in the Nd3+:Y2SiO5 rod than in the prelase-limited Nd:YAG rod. RP COMASKEY, B (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 10 TC 10 Z9 10 U1 0 U2 8 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD DEC 1 PY 1993 VL 18 IS 23 BP 2029 EP 2031 DI 10.1364/OL.18.002029 PG 3 WC Optics SC Optics GA MJ099 UT WOS:A1993MJ09900013 PM 19829481 ER PT J AU STREITWIESER, A BARROS, MT WANG, HK BOUSSIE, TR AF STREITWIESER, A BARROS, MT WANG, HK BOUSSIE, TR TI [1,2-BIS([8]ANNULENYLDIMETHYLSILYL)ETHANE]URANIUM, THE 1ST-BRIDGED URANOCENE SO ORGANOMETALLICS LA English DT Note AB 1,2-Bis(cyclooctatetraenyldimethylsilyl)ethane (1) was prepared and converted to the corresponding bridged uranocene (eta8:eta8-1,2-bis([8]annulen-yldimethylsilyl)ethane)uranium(IV) (2). The temperature-dependent NMR spectrum of 2 indicates a flexible molecule that twists between enantiomeric structures with a barrier of about 13 kcal mol-1. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP STREITWIESER, A (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Barros, Maria Teresa/D-7930-2013; REQUIMTE, ORG/M-4578-2013; REQUIMTE, LAQV/N-9835-2013 OI Barros, Maria Teresa/0000-0002-2307-1368; NR 14 TC 5 Z9 5 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD DEC PY 1993 VL 12 IS 12 BP 5023 EP 5024 DI 10.1021/om00036a052 PG 2 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA MM129 UT WOS:A1993MM12900052 ER PT J AU MANCHESTER, JI SHIBATA, M SETLIK, RF ORNSTEIN, RL REIN, R AF MANCHESTER, JI SHIBATA, M SETLIK, RF ORNSTEIN, RL REIN, R TI APPLICABILITY OF PM3 TO TRANSPHOSPHORYLATION REACTION-PATH - TOWARD DESIGNING A MINIMAL RIBOZYME SO ORIGINS OF LIFE AND EVOLUTION OF THE BIOSPHERE LA English DT Article ID BASE-CATALYZED-HYDROLYSIS; INTERVENING SEQUENCE; PROTEIN-SYNTHESIS; RNA; TETRAHYMENA; PHOSPHATE; ORIGIN; 5'-PHOSPHORIMIDAZOLIDE; OLIGOMERIZATION; RIBONUCLEOTIDES AB A growing body of evidence shows that RNA can catalyze many of the reactions necessary both for replication of genetic material and the possible transition into the modern protein-based world. However, contemporary ribozymes are too large to have self-assembled from a prebiotic oligonucleotide pool. Still, it is likely that the major features of the earliest ribozymes have been preserved as molecular fossils in the catalytic RNA of today. Therefore, the search for a minimal ribozyme has been aimed at finding the necessary structural features of a modern ribozyme (Beaudry and Joyce, 1990). Both a three-dimensional model and quantum chemical calculations are required to quantitatively determine the effects of structural features of the ribozyme on the reaction it catalyzes. Using this model, quantum chemical calculations must be performed to determine quantitatively the effects of structural features on catalysis. Previous studies of the reaction path have been conducted at the ab initio level, but these methods are limited to small models due to enormous computational requirements. Semiempirical methods have been applied to large systems in the past; however, the accuracy of these methods depends largely on the system under investigation. In the preent study we assess the validity of the MNDO/PM3 method on a simple model of the ribozyme-catalyzed reaction, or hydrolysis of phosphoric acid. We find that the results are qualitatively similar to ab initio results using large basis sets. Therefore, PM3 is suitable for studying the reaction path of the ribozyme-catalyzed reaction. C1 NEW YORK STATE DEPT HLTH, ROSWELL PK MEM INST, DEPT BIOPHYS, 666 ELM ST, BUFFALO, NY 14263 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 31 TC 1 Z9 1 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0169-6149 J9 ORIGINS LIFE EVOL B JI Orig. Life Evol. Biosph. PD DEC PY 1993 VL 23 IS 5-6 BP 419 EP 427 DI 10.1007/BF01582089 PG 9 WC Biology SC Life Sciences & Biomedicine - Other Topics GA MV299 UT WOS:A1993MV29900013 PM 8115165 ER PT J AU EASTMAN, JA FITZSIMMONS, MR THOMPSON, LJ AF EASTMAN, JA FITZSIMMONS, MR THOMPSON, LJ TI ANOMALOUS DEFECT BEHAVIOR RESULTING FROM THE HYDRIDING OF NANOCRYSTALLINE PALLADIUM SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID NEUTRON POWDER DIFFRACTION; PD; HYDROGEN AB X-ray diffraction measurements on a nanocrystalline Pd sample transformed in situ to PdH0.56 are described. Debye-Waller parameter measurements at several temperatures showed unexpected increases in both thermal and static atomic displacements caused by the hydriding. These increased displacements are associated either with the creation of new point defects on the Pd sublattice or with an increase in the magnitude of the strain fields of previously existing point defects. Substantial X-ray peak broadening due to the production of large numbers of dislocations is seen when coarse-grained Pd is hydrided. In contrast, measurable changes in the peak breadths were not observed for the nanocrystalline sample as a result of hydriding, indicating that dislocations with long-range displacement fields are not created when nanocrystalline Pd is hydrided. A preference to produce or modify short-range defects instead of dislocations during hydriding may occur as a result of the larger stresses required to generate dislocations when the grain size of the material is small. C1 LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. RP EASTMAN, JA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Eastman, Jeffrey/E-4380-2011; Lujan Center, LANL/G-4896-2012; OI Eastman, Jeff/0000-0002-0847-4265 NR 19 TC 9 Z9 9 U1 1 U2 2 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 DEC PY 1993 VL 68 IS 6 BP 335 EP 343 DI 10.1080/09500839308242425 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA MK355 UT WOS:A1993MK35500002 ER PT J AU DUDEK, EJ PEAK, JG ROTH, RM PEAK, MJ AF DUDEK, EJ PEAK, JG ROTH, RM PEAK, MJ TI ISOLATION OF V79 FIBROBLAST CELL-LINES CONTAINING ELEVATED METALLOTHIONEIN LEVELS THAT HAVE INCREASED RESISTANCE TO THE CYTOTOXIC EFFECTS OF ULTRAVIOLET-A RADIATION SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID CULTURED MAMMALIAN-CELLS; SINGLE-STRAND BREAKS; DNA; INDUCTION; RADIORESISTANCE; GLUTATHIONE; PROTECTION; TOXICITY; AGENTS; REPAIR AB Isolated clones of V79 Chinese hamster lung fibroblasts, selected for resistance against cadmium toxicity, were exposed to monochromatic 365 nm ultraviolet-A (UVA; 320 nm to visible light) radiation and examined for cell survival. All three of the Cd-resistant V79 clones (V79Cd) tested exhibited significant increases in survival after irradiation compared with control cultures similar to the increased survival observed in Zn acetate-induced V79 cells. Dose-modifying factors calculated for these survival experiments were all approximately 1.5. When characterized for steady-state levels of metallothionein (MT) mRNA and associated Cd-binding activity, all of the Cd-resistant V79Cd clones demonstrated elevated constitutive levels of both, implicating MT as the mechanism responsible for the observed cellular resistance to Cd and also to 365 nm WA radiation. However, whereas levels of intracellular MT protein correlated with differences in survival against Cd, MT intracellular levels did not correlate well with protection against 365 nm UVA. Increased cell survival after exposure to 365 nm UVA radiation mediated by MT appeared to reach a threshold level and MT only provided a limited degree of protection. Since UVA radiation is known to cause cell death mediated through the intracellular generation of reactive oxygen species (ROS), these results suggest that the role of MT in ameliorating cellular photooxidative damage produced by UVA is by reducing intracellular ROS. C1 ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,MOLEC PHOTOBIOL GRP,ARGONNE,IL 60439. ILLINOIS INST TECHNOL,DEPT BIOL,CHICAGO,IL 60616. FU NCI NIH HHS [R01 CA 37848, R01 CA 34492] NR 31 TC 19 Z9 20 U1 0 U2 1 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD DEC PY 1993 VL 58 IS 6 BP 836 EP 840 DI 10.1111/j.1751-1097.1993.tb04980.x PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA MQ238 UT WOS:A1993MQ23800012 PM 8310006 ER PT J AU KLEIN, MP SAUER, K YACHANDRA, VK AF KLEIN, MP SAUER, K YACHANDRA, VK TI PERSPECTIVES ON THE STRUCTURE OF THE PHOTOSYNTHETIC OXYGEN-EVOLVING MANGANESE COMPLEX AND ITS RELATION TO THE KOK CYCLE SO PHOTOSYNTHESIS RESEARCH LA English DT Review DE PHOTOSYSTEM II; OXYGEN EVOLUTION; MANGANESE ID ELECTRON-PARAMAGNETIC-RES; RAY ABSORPTION-SPECTROSCOPY; PHOTOSYSTEM-II PARTICLES; EXTENDED X-RAY; WATER OXIDATION; O-2-EVOLVING COMPLEX; O2-EVOLVING COMPLEX; S2 STATE; FINE-STRUCTURE; AMMONIA BINDS AB This review describes the progress in our understanding of the structure of the Mn complex in Photosystem II over the last two decades. Emphasis is on the research from our laboratory, especially the results from X-ray absorption spectroscopy, low temperature electron paramagnetic resonance and electron spin echo envelope modulation studies. The importance of the interplay between electron paramagnetic resonance studies and Xray absorption studies, which has led to a description of the oxidation states of manganese as the enzyme cycles through the Kok cycle, is described. Finally, the path, by which our group has utilized these two important methods to arrive at a working structural model for the manganese complex that catalyzes the oxidation of water to dioxygen in higher plants and cyanobacteria, is explained. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP KLEIN, MP (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720, USA. NR 67 TC 49 Z9 49 U1 1 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 DEC PY 1993 VL 38 IS 3 BP 265 EP 277 DI 10.1007/BF00046751 PG 13 WC Plant Sciences SC Plant Sciences GA MX417 UT WOS:A1993MX41700006 PM 24317980 ER PT J AU BOWLBY, NR ESPE, M BHATNAGAR, R WANG, J HOGANSON, C MCINTOSH, L BABCOCK, GT AF BOWLBY, NR ESPE, M BHATNAGAR, R WANG, J HOGANSON, C MCINTOSH, L BABCOCK, GT TI ANALYTICAL PROCEDURES FOR THE QUANTIFICATION OF ISOTOPIC AMINO-ACID-INCORPORATION INTO PHOTOSYNTHETIC PROTEINS OF SYNECHOCYSTIS PCC-6803 SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE AUXOTROPH; MASS SPECTROMETRY; PHOTOSYSTEM II; TYROSINE ID PHOTOSYSTEM-II; TYROSINE RADICALS; SPECTROSCOPY AB The mechanism of oxygen evolution has been an enigma for nearly two centuries. Pioneering work by Bessel Kok, Pierre Joliot, and many others during the last quarter century has provided valuable insight into this most unique and important chemical reaction. The late 1970s and early 1980s saw the introduction of biochemical techniques for the purification of photosynthetic complexes that have, in turn, stimulated the biophysical chemists and spectroscopists to apply high resolution techniques in order to resolve the structure/function relationships in these protein complexes. Valuable information about events at the atomic level can be gained through isotopic substitution of particular amino acids thought to be important in the catalytic process. The ability to generate functional auxotrophs in the photosynthetic cyanobacterium Synechocystis 6803 has been used successfully to identify the redox active components Z and D as tyrosine residues in the reaction center of Photosystem II. In this report, we present results of the application of specific isotopic labeling for high resolution spectroscopy of purified PS II particles. We have developed analytical procedures for monitoring the incorporation of both H-2 and O-17 labeled amino acids by gas chromatography-mass spectroscopic analysis. We also show that the growth curve of cells subjected to obligate auxotrophy displays two distinct stationary phases; one that corresponds to depletion of exogenous amino acids, and a second that corresponds to the normal cell density at stationary phase. Cells harvested at the second stationary phase show little or no retention of the labeled amino acid. C1 MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824. MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824. MICHIGAN STATE UNIV,NIH,MASS SPECTROMETRY FACIL,E LANSING,MI 48824. NR 11 TC 1 Z9 1 U1 0 U2 0 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 DEC PY 1993 VL 38 IS 3 BP 379 EP 386 DI 10.1007/BF00046764 PG 8 WC Plant Sciences SC Plant Sciences GA MX417 UT WOS:A1993MX41700019 PM 24317993 ER PT J AU TAOKA, S JURSINIC, PA SEIBERT, M AF TAOKA, S JURSINIC, PA SEIBERT, M TI SLOW OXYGEN RELEASE ON THE FIRST 2 FLASHES IN CHEMICALLY STRESSED PHOTOSYSTEM-II MEMBRANE-FRAGMENTS RESULTS FROM HYDROGEN-PEROXIDE OXIDATION SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE HYDROGEN PEROXIDE; HYDROXYLAMINE; KINETICS; MANGANESE; OXYGEN RELEASE; PHOTOSYNTHESIS; PHOTOSYSTEM II ID OSCILLATORIA-CHALYBEA; EVOLVING COMPLEX; O2 EVOLUTION; DONOR SIDE; SPINACH; THYLAKOIDS; MANGANESE; CHLORIDE; PROTEIN; TIME AB Flash-induced amperometric signals were measured with a Joliot-type O-2 rate electrode in spinach Photosystem II (PS II) membrane fragments exposed to very low concentrations of added hydroxylamine or hydrogen peroxide. In both cases 'anomalous O-2 signals' were observed on the first two flashes, and oscillating four-flash patterns were observed on subsequent flashes. The anomalous signals were eliminated in the presence of catalase but not EDTA. The rise times of the O-2-release kinetics associated with the anomalous signals were slow (ca. 20 ms with NH2OH and ca. 120 ms with H2O2) compared to the kinetics of O-2 release on subsequent flashes and in control membranes (3-6 ms). It is proposed that when the intact PS II O-2-evolving complex is perturbed with small concentrations of added reductant, H2O2 can gain access and bind to the complex. Bound H2O2 can then reduce lower S states in some centers leading to anomalous O-2 signals on the first two flashes. A model is presented to explain both types of anomalous O-2 production. Oxygen observed on the third and subsequent flashes is due to the normal photosynthetic O-2-evolution process arising from the S-3-state. Anomalous O-2 production could be a protective mechanism in PS II centers subjected to stress conditions. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. US AGR RES SERV,NO REG RES CTR,PEORIA,IL 61604. NR 24 TC 12 Z9 12 U1 2 U2 4 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 DEC PY 1993 VL 38 IS 3 BP 425 EP 431 DI 10.1007/BF00046770 PG 7 WC Plant Sciences SC Plant Sciences GA MX417 UT WOS:A1993MX41700025 PM 24317999 ER PT J AU PARAK, F FRAUENFELDER, H AF PARAK, F FRAUENFELDER, H TI PROTEIN DYNAMICS SO PHYSICA A LA English DT Article; Proceedings Paper CT International Workshop on Dynamics of Disordered Materials II CY MAR 22-24, 1993 CL GRENOBLE, FRANCE SP FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, INST LAUE LANGEVIN GRENOBLE ID MOSSBAUER-SPECTROSCOPY; TEMPERATURE-DEPENDENCE; METMYOGLOBIN CRYSTALS; STRUCTURAL DYNAMICS; RAYLEIGH-SCATTERING; LIGAND-BINDING; HEME-PROTEINS; MYOGLOBIN; BEHAVIOR; DISTRIBUTIONS AB Protein dynamics reveals the complexity of these biomolecules. The structural fluctuations and relaxations are determined by a rugged energy landscape where the vallies, the conformational substates, are arranged in a hierarchy of tiers. Several experimental techniques have been used to study the different aspects of protein dynamics. We discuss X-ray structure determinations and pressure tuned hole burning experiments to study structural distributions. Equilibrium fluctuations have been studied by Mossbauer spectroscopy, Rayleigh scattering of Mossbauer radiation and incoherent neutron scattering. Most results on structural relaxations have been obtained from the CO rebinding kinetics in CO ligated myoglobin after flash-photolysis. In addition some Mossbauer investigations of structural relaxation are discussed. C1 TECHN UNIV MUNCHEN,FAK PHYS E17,D-85748 GARCHING,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV ILLINOIS,URBANA,IL 61801. RP PARAK, F (reprint author), UNIV MAINZ,INST MOLEK BIOPHYS,FB 21,J WELDERWEG 26,D-55099 MAINZ,GERMANY. NR 37 TC 57 Z9 57 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD DEC 1 PY 1993 VL 201 IS 1-3 BP 332 EP 345 DI 10.1016/0378-4371(93)90431-3 PG 14 WC Physics, Multidisciplinary SC Physics GA MQ922 UT WOS:A1993MQ92200040 ER PT J AU SABOUNGI, ML FORTNER, J PRICE, DL HOWELLS, WS AF SABOUNGI, ML FORTNER, J PRICE, DL HOWELLS, WS TI REORIENTATIONS IN PLASTIC CRYSTAL PHASES OF ZINTL ALLOYS SO PHYSICA A LA English DT Article; Proceedings Paper CT International Workshop on Dynamics of Disordered Materials II CY MAR 22-24, 1993 CL GRENOBLE, FRANCE SP FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, INST LAUE LANGEVIN GRENOBLE ID METAL LEAD ALLOYS; CSPB; KPB AB Quasielastic neutron scattering measurements on the Zintl alloy NaSn show that the high-temperature solid phase discovered by Hume-Rothery is a plastic crystal characterized by rapid rotations of the Sn4{4-} Zintl ions. The reorientations are similar to those previously observed in CsPb but have a markedly different wave vector dependence, indicating a different behaviour of the alkali metal ions. C1 RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. RP SABOUNGI, ML (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Price, David Long/A-8468-2013; Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD DEC 1 PY 1993 VL 201 IS 1-3 BP 421 EP 424 DI 10.1016/0378-4371(93)90444-9 PG 4 WC Physics, Multidisciplinary SC Physics GA MQ922 UT WOS:A1993MQ92200053 ER PT J AU DALICHAOUCH, Y DEANDRADE, MC MAPLE, MB AF DALICHAOUCH, Y DEANDRADE, MC MAPLE, MB TI SYNTHESIS, TRANSPORT, AND MAGNETIC-PROPERTIES OF LN2-XCEXCUO4-Y SINGLE-CRYSTALS (LN = ND, PR, SM) SO PHYSICA C LA English DT Article ID NORMAL STATE; GROWTH; SUPERCONDUCTIVITY; ND2-XCEXCUO4-Y; SYSTEM; FIELD; PR2CUO4; ND2CUO4; OXIDES AB Single Crystals Ln2-xCexCuO4-y (Ln = Nd, Pr, Sm; 0 less-than-or-equal-to x less-than-or-equal-to 0.2) were grown in CuO flux and characterized by means of X-ray diffraction and microprobe analyses, electrical resistivity, and magnetic susceptibility. There is a large variation of the Ce content from crystal to crystal within a given batch and the distribution width decreases with increasing Ce starting composition. The temperature dependence of the normal-state electrical resistivity and the resistively determined superconducting critical temperature T(c) are very sensitive to the heat treatment. The magnetic susceptibility of Ln2-xCexCuO4-y Single crystals, MeasUred for two orientations of the crystals with respect to the applied field H, reveals a high anisotropy and indicates the presence of crystalline electric-field (CEF) effects. C1 UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP DALICHAOUCH, Y (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 26 TC 11 Z9 11 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1993 VL 218 IS 1-2 BP 309 EP 315 DI 10.1016/0921-4534(93)90296-3 PG 7 WC Physics, Applied SC Physics GA MM298 UT WOS:A1993MM29800041 ER PT J AU PINDZOLA, MS SCHULTZ, DR GRIFFIN, DC AF PINDZOLA, MS SCHULTZ, DR GRIFFIN, DC TI QUANTAL AND CLASSICAL DIFFERENTIAL-SCATTERING CALCULATIONS FOR THE ELECTRON-IMPACT EXCITATION OF ARGON IONS SO PHYSICAL REVIEW A LA English DT Article ID CROSS-SECTIONS; ATOM COLLISIONS; ENERGY-LOSS; CONTINUUM AB Electron-scattering cross sections for the 3s --> 3p dipole transition in Ar7+ are calculated in both the quantal distorted-wave approximation and the classical-trajectory Monte Carlo method. The two approaches are in substantial agreement for the angular differential cross section at 20-, 50-, and 100-eV incident electron energy. This result indicates the degree to which classical scattering influences the dipole excitation. Further distorted-wave calculations are made for the 3s --> 3d and 3s --> 4s transitions in Ar7+ and the 3s2 1S --> 3s3p P-3, P-1 transitions in Ar6+. The forward-backward asymmetry in the angular distribution of scattered electrons is examined for each transition. All transitions exhibit strong backward scattering at energies near the excitation threshold. C1 OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. ROLLINS COLL, DEPT PHYS, WINTER PK, FL 32789 USA. RP AUBURN UNIV, DEPT PHYS, AUBURN, AL 36849 USA. NR 22 TC 10 Z9 10 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1993 VL 48 IS 6 BP 4333 EP 4338 DI 10.1103/PhysRevA.48.4333 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MM347 UT WOS:A1993MM34700045 ER PT J AU BAE, YK BEUHLER, RJ CHU, YY FRIEDLANDER, G FRIEDMAN, L AF BAE, YK BEUHLER, RJ CHU, YY FRIEDLANDER, G FRIEDMAN, L TI DD-NUCLEAR-FUSION REACTIONS WITH SMALL D2O AND H2O CLUSTERS IMPACTING HEAVY ICE SO PHYSICAL REVIEW A LA English DT Article ID WATER CLUSTERS; YIELDS; SURFACES; SIMULATION; TARGETS AB The large DD-fusion-yield enhancement reported earlier by our group [Phys. Rev. Lett. 63, 1292 (1989); J. Phys. Chem. 94, 7665 (1990)] in the bombardment of deuterated targets by large heavy-water clusters was shown by postacceleration magnetic and electrostatic filtering to be due to small-ion impurities produced in the acceleration column. With the filtering arrangement in place we have carefully studied DD-fusion rates with small (D2O)(n)D+ and (H2O)(n)H+ ions (n less-than-or-equal-to 10) which produced detectable fusion rates. Formation of carbon films on the polydeuteroethylene surfaces caused the observed fusion rates to decrease rapidly with time. This problem was solved by using D2O ice targets which are ''self-cleaning.'' No enhancement was observed for the fusion rates of the small D2O clusters after the oxygen knock-on corrections were made. However, the fusion yields for knock-on processes produced by (H2O)(n)H+ clusters (4 less-than-or-equal-to n less-than-or-equal-to 10) showed approximately a twofold enhancement over the yields for H3O+ ions at the same velocity. The stopping power of clusters was measured and shown not to be responsible for this enhancement. RP BAE, YK (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 18 TC 5 Z9 5 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1993 VL 48 IS 6 BP 4461 EP 4466 DI 10.1103/PhysRevA.48.4461 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MM347 UT WOS:A1993MM34700059 ER PT J AU MEYER, FW HAVENER, CC VANEMMICHOVEN, PAZ AF MEYER, FW HAVENER, CC VANEMMICHOVEN, PAZ TI ABOVE-SURFACE NEUTRALIZATION OF SLOW N6+ IONS DURING INTERACTIONS WITH A CU(001) TARGET SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; X-RAY; ELECTRON-EMISSION; MULTICHARGED IONS; AR IONS AB Measurements are reported for projectile K-Auger-electron emission, observed at 90-degrees to the incident beam direction, during interactions of 60-keV N6+ ions with a clean Cu(001) target at grazing incidence angles in the range 0.2-degrees-20-degrees. Spectral features in the projectile K-Auger-electron spectra consistent with above-surface K-Auger-electron emission were observed at perpendicular velocities below 1.37 X 10(-2) a.u. (incidence angle psi < 1.9-degrees). At incidence angles below 0.8-degrees (nu(perpendicular-to) < 5.8 X 10(-3) a.u.) the above-surface K Auger yields were observed to saturate, reaching a maximum value of about 12% of the total K-Auger-electron production. The present results are in good agreement with earlier measurements. C1 JOINT INST HEAVY ION RES,HOLIFIELD HEAVY ION RES FACIL,OAK RIDGE,TN 37831. RP MEYER, FW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 11 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1993 VL 48 IS 6 BP 4476 EP 4478 DI 10.1103/PhysRevA.48.4476 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MM347 UT WOS:A1993MM34700061 ER PT J AU MEYER, FW FOLKERTS, L HUGHES, IG OVERBURY, SH ZEHNER, DM VANEMMICHOVEN, PAZ AF MEYER, FW FOLKERTS, L HUGHES, IG OVERBURY, SH ZEHNER, DM VANEMMICHOVEN, PAZ TI WORK-FUNCTION DEPENDENCE OF ABOVE-SURFACE NEUTRALIZATION OF MULTICHARGED IONS SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; ELECTRON-EMISSION; HOLLOW ATOMS; AR IONS; COLLISIONS; TARGET AB Measurements have been made of projectile K-Auger-electron emission during interactions of 60-keV N6+ ions grazingly incident on a Au(011) single crystal whose work function was modified by submonolayer deposits of Cs. K Auger spectra were obtained for incidence angles in the range 0.3-degrees-5-degrees, using clean, as well as cesiated, Au surfaces whose work function had been reduced by as much as 3.3 eV. For incidence angles smaller than 5-degrees, an enhancement on the above-surface K Auger component, relative to that observed for ''clean'' Au, could be discerned with decreasing surface work function, which appears to saturate below 0.7-degrees (corresponding to an inverse perpendicular velocity of about 200 a.u.-1) at approximately 30-35 %. The experimental results are compared with modeling studies of the work-function dependence of above-surface neutralization and projectile K Auger emission, using a simulation based on the classical over-the-barrier model that was modified to treat the case of a ''two-component'' surface. The simulation results agree qualitatively with the experimental results up to nu(perpendicular-to)-1 = 200. At higher inverse perpendicular velocities, the simulated enhancement continues to increase and exceeds the clean Au result by more than a factor of 2 at nu(perpendicular-to)-1 = 1000. Speculations about possible reasons for this discrepancy will be presented. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP MEYER, FW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 18 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1993 VL 48 IS 6 BP 4479 EP 4484 DI 10.1103/PhysRevA.48.4479 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MM347 UT WOS:A1993MM34700062 ER PT J AU NILSEN, J MACGOWAN, BJ DASILVA, LB MORENO, JC AF NILSEN, J MACGOWAN, BJ DASILVA, LB MORENO, JC TI PREPULSE TECHNIQUE FOR PRODUCING LOW-Z NE-LIKE X-RAY LASERS SO PHYSICAL REVIEW A LA English DT Article ID LINES; FOIL AB We report an application of the prepulse technique which uses a low-intensity prepulse before the main optical drive pulse to prepare the plasma prior to lasing in low-Z, Ne-like ions. Ne-like x-ray lasers are now available over a previously inaccessible range of wavelengths. As an illustration of this technique we report an observation of lasing in Cr14+ and Fe16+ on the Ne-like J = 0 --> 1, 3p --> 3s transitions at 285 and 255 angstrom as well as gain measurements for Ti12+. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 14 TC 211 Z9 211 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1993 VL 48 IS 6 BP 4682 EP 4685 DI 10.1103/PhysRevA.48.4682 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MM347 UT WOS:A1993MM34700086 ER PT J AU PERRY, MD CRANE, JK AF PERRY, MD CRANE, JK TI HIGH-ORDER HARMONIC EMISSION FROM MIXED FIELDS SO PHYSICAL REVIEW A LA English DT Note ID LASER FIELD; GENERATION; IONIZATION; IONS AB Production of sum-frequency radiation and ''even'' harmonics from the mixed 1omega (1053 nm) and 2omega (527 nm) field is observed and compared to measurements of the relative conversion efficiency of the independent fields. By controlling the relative polarization of the two fields, we can control the mixing efficiency and produce coherent extreme ultraviolet (XUV) radiation polarized orthogonally to the strong driving field. Extension to produce XUV radiation of arbitrary polarization is discussed. RP PERRY, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,LASER PROGRAM,POB 808,L-493,LIVERMORE,CA 94550, USA. NR 11 TC 122 Z9 122 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1993 VL 48 IS 6 BP R4051 EP R4054 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MM347 UT WOS:A1993MM34700011 ER PT J AU YOO, CS AKELLA, J MORIARTY, JA AF YOO, CS AKELLA, J MORIARTY, JA TI HIGH-PRESSURE MELTING TEMPERATURES OF URANIUM - LASER-HEATING EXPERIMENTS AND THEORETICAL CALCULATIONS SO PHYSICAL REVIEW B LA English DT Article ID GENERALIZED PSEUDOPOTENTIAL THEORY; DENSITY-FUNCTIONAL FORMULATION; INTERATOMIC POTENTIALS; PHASE-TRANSITIONS; METALS; IRON; MO AB The melting temperatures of uranium have been measured to 45 GPa with an inert Ar pressure medium in a diamond-anvil cell using a spatially resolved laser-heating system. The temperature was measured within 1.4 mum at the center of laser-heating spot using reflecting optics, and the melting was visually observed as the material flows forming a microchannel and/or by a shape change in the edge of the sample. Theoretically, the melting curve has also been calculated to 100 GPa via gamma(bcc) solid and liquid free energies derived from generalized pseudopotential theory. The calculated melting temperatures agree well with the experimental measurements. It is also found that the theoretical melting curve obeys a Lindemann scaling law for solid densities up to about 25.5 g/cm-3, corresponding to 100 GPa in pressure. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. NR 28 TC 17 Z9 20 U1 2 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 15529 EP 15534 DI 10.1103/PhysRevB.48.15529 PG 6 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100001 ER PT J AU LEE, EH HEMBREE, DM RAO, GR MANSUR, LK AF LEE, EH HEMBREE, DM RAO, GR MANSUR, LK TI RAMAN-SCATTERING FROM ION-IMPLANTED DIAMOND, GRAPHITE, AND POLYMERS SO PHYSICAL REVIEW B LA English DT Article ID AMORPHOUS-CARBON-FILMS; WEAR PROPERTIES; IRRADIATION; HARDNESS; SPECTRUM AB Raman scattering studies were carried out to investigate the effects of ion implantation on the structure of diamond, graphite, and polymers. Carbon phases produced by chemical vapor deposition (CVD diamond) and rf discharge (diamondlike carbon or DLC) were also analyzed. Two types of amorphous carbon phases were distinguished with relevance to hardness. In general, amorphous carbon phases produced by electron beam evaporation and sputtering are soft (hardness much less than 1 GPa), while DLC and some ion-beam-modified polymers are much harder. In all cases, the characteristic Raman bands of the starting material were lost upon ion implantation, and for the lowest fluences the one-phonon bands near 1360 cm-1 (D line) and 1580 cm-1 (G line) of disordered polycrystalline graphite appeared. With increasing fluence these bands coalesced into a broad, asymmetric peak with the D line shifting to higher wave number and the G line shifting to lower wave number. This trend was clearly distinguishable from the finite crystallite size effect seen in graphite, where, in addition to the appearance of the D line, the G line shifts to higher wave number with decreasing crystallite sizes. Raman scattering could not distinguish between soft and hard amorphous carbon. There was also no indication that the hardness of DLC films and ion-beam-modified polymers was due to diamondlike sp3 bonds. Instead, hardness in these materials is related to the three-dimensional interconnectivity of chemical bonds. Experimental results suggest that the amorphous carbons examined in this study are composed of random networks of distorted sp, sp2, and Sp3 bonded atoms, sometimes in a hydrogenated state. The hard carbons such as DLC films and ion beam modified polymers have long-range chemical connectivity while the soft carbons such as damaged graphite, and carbon films prepared by sputter deposition lack such connectivity. C1 MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE Y12 PLANT,OAK RIDGE,TN 37831. RP LEE, EH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37830, USA. NR 45 TC 99 Z9 100 U1 4 U2 29 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 DEC 1 PY 1993 VL 48 IS 21 BP 15540 EP 15551 DI 10.1103/PhysRevB.48.15540 PG 12 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100003 ER PT J AU MELSEN, J WILLS, JM JOHANSSON, B ERIKSSON, O AF MELSEN, J WILLS, JM JOHANSSON, B ERIKSSON, O TI PREDICTION OF A BCC STRUCTURE IN COMPRESSED YTTRIUM SO PHYSICAL REVIEW B LA English DT Article ID CRYSTAL-STRUCTURE; SYSTEMS; METALS; BAND AB Crystallographic phase transitions between close-packed structures in Y have been studied theoretically, using a full-potential, linear muffin-tin orbitals method. At the equilibrium volume the hcp structure is correctly found to have the lowest energy, and at a calculated pressure of 60 kbar the fcc phase becomes stable. It is found that the so-called omega phase is only marginally lower than the hcp and the fcc structures over a large volume range. At even higher pressures another crystal phase in yttrium is found, namely the bcc phase, which is predicted to become stable at a pressure of 2.8 Mbar. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87544. RP MELSEN, J (reprint author), UNIV UPPSALA,DEPT PHYS,CONDENSED MATTER THEORY GRP,BOX 530,S-75122 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 15 TC 13 Z9 14 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 DEC 1 PY 1993 VL 48 IS 21 BP 15574 EP 15577 DI 10.1103/PhysRevB.48.15574 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100006 ER PT J AU SHIRANE, G COWLEY, RA MATSUDA, M SHAPIRO, SM AF SHIRANE, G COWLEY, RA MATSUDA, M SHAPIRO, SM TI Q-DEPENDENCE OF THE CENTRAL PEAK IN THE INELASTIC-NEUTRON-SCATTERING SPECTRUM OF SRTIO3 SO PHYSICAL REVIEW B LA English DT Article ID R-POINT INSTABILITY; X-RAY-SCATTERING; STRUCTURAL PHASE-TRANSITIONS; CRITICAL FLUCTUATIONS; KMNF3; DYNAMICS; RBCAF3 AB The recent discovery, by high-resolution x-ray-diffraction measurements, of two length scales in SrTiO3 motivated a reinvestigation by neutron scattering of the soft phonon and associated central peak above the zone-boundary structural-phase-transition temperature (T(c) = 99.5 K). The central peak has an anisotropic q width which is determined by the anisotropy of the slopes of the dispersion curves. The correlation length derived from the energy-integrated intensities of the phonon and the central peak agree well with the short length scale measured in the x-ray studies. The sharp component, corresponding to the long length scale observed in the x-ray experiment just above T(c), is absent in the neutron-scattering measurement. Since the neutron experiment probes the total sample volume, the absence of the narrow component supports the view that it originates in the near-surface region of the crystal. C1 UNIV OXFORD,CLARENDON LAB,OXFORD OX1 3PU,ENGLAND. RP SHIRANE, G (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 29 TC 42 Z9 42 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 DEC 1 PY 1993 VL 48 IS 21 BP 15595 EP 15602 DI 10.1103/PhysRevB.48.15595 PG 8 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100009 ER PT J AU MANOSA, L ZARESTKY, J LOGRASSO, T DELANEY, DW STASSIS, C AF MANOSA, L ZARESTKY, J LOGRASSO, T DELANEY, DW STASSIS, C TI LATTICE-DYNAMICAL STUDY OF THE PREMARTENSITIC STATE OF THE CU-AL-BE ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID SHAPE-MEMORY ALLOYS; ZN-AL; MARTENSITIC-TRANSFORMATION; PHASE; RELAXATION AB Neutron-scattering techniques have been used to study the premartensitic state of a family of Cu-Al-Be alloys, which transform from the bec phase to an 18R martensitic structure. We find that the phonon modes of the TA2[110] branch have very low energies with anomalous temperature dependence. A slight anomaly at q = 2/3 was observed; this anomaly, however, does not change significantly with temperature. No elastic peaks, related to the martensite structure, were found in the premartensitic state of these alloys. The results are compared with measurements, performed under the same instrumental conditions, on two Cu-Al-Ni and a Cu-Zn-Al martensitic alloy. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP MANOSA, L (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Manosa, Lluis/D-8579-2014 OI Manosa, Lluis/0000-0002-1182-2670 NR 18 TC 27 Z9 27 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 DEC 1 PY 1993 VL 48 IS 21 BP 15708 EP 15711 DI 10.1103/PhysRevB.48.15708 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100022 ER PT J AU FULLERTON, EE CONOVER, MJ MATTSON, JE SOWERS, CH BADER, SD AF FULLERTON, EE CONOVER, MJ MATTSON, JE SOWERS, CH BADER, SD TI OSCILLATORY INTERLAYER COUPLING AND GIANT MAGNETORESISTANCE IN EPITAXIAL FE/CR(211) AND (100) SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC MULTILAYERED STRUCTURES; MOLECULAR-BEAM EPITAXY; X-RAY-DIFFRACTION; TEMPERATURE-DEPENDENCE; EXCHANGE INTERACTION; LAYERS; PERIOD; CONDUCTIVITY; SANDWICHES; CO/CU/CO AB An epitaxial orientation of Fe/Cr superlattices-Fe/Cr(211) on MgO(110)-is grown by magnetron sputtering. Its structural and magnetic characterizations are presented and compared to those for Fe/Cr(100) superlattices grown simultaneously onto MgO(100) substrates. The epitaxial orientation of the Fe/Cr(211) superlattices is Fe/Cr[011BAR] parallel-to MgO[001] and Fe/Cr[111BAR] parallel-to MgO[110BAR], while that for Fe/Cr(100) is Fe/Cr[00I] parallel-to MgO[0ll]. A uniaxial, in-plane surface anisotropy for the Fe/Cr(211) superlattices along the Fe[011BAR] of 0.06 erg/cm2 is obtained from analysis of the magnetization hysteresis loops. Four oscillations in the antiferromagnetic interlayer coupling and giant magnetoresistance (GMR) are observed with a period of 18 angstrom for both orientations. The strength, oscillation period, and phase of the magnetic coupling are identical for the two orientations. The GMR values increase by a factor of approximately 4 to 5 on cooling from room temperature to 4.2 K. At 4.2 K the maximum GMR value of the [Fe(14 angstrom)/Cr(8 angstrom)]50 superlattice is 70% for the (211) orientation and 150% for the (100) orientation. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 38 TC 177 Z9 178 U1 5 U2 17 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 DEC 1 PY 1993 VL 48 IS 21 BP 15755 EP 15763 DI 10.1103/PhysRevB.48.15755 PG 9 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100028 ER PT J AU WANG, DS WU, RQ FREEMAN, AJ AF WANG, DS WU, RQ FREEMAN, AJ TI MAGNETOCRYSTALLINE ANISOTROPY OF CO-PD INTERFACES SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-ANISOTROPY; 1ST-PRINCIPLES CALCULATION; ENERGY; MULTILAYERS; COBALT; FILMS AB The interface magnetocrystalline anisotropy (MCA) of a Pd/Co/Pd sandwich is calculated by employing the recently proposed state-tracking approach and the full-potential linearized augmented-plane-wave energy band structure. The strong positive (perpendicular) Co-Pd interface MCA arises from the hybridization between the out-of-plane Co bonding xz(yz) states with the interface Pd atom: the large d-d bonding strength and high energy of the Pd d states shifts a substantial component of these Co states (bands) above the Fermi energy. Comparisons with a previous study on the Co-Cu interface makes clear that the difference between the effects of two groups of substrates (Cu, Ag versus Pd, Au, etc.) depends on the interface bonding strength and the position of the d states of the interface atoms-as is qualitatively revealed by an analysis based on the use of an effective ligand-interaction model. C1 ACAD SINICA,INST PHYS,BEIJING 100080,PEOPLES R CHINA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WANG, DS (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Wu, Ruqian/C-1395-2013 OI Wu, Ruqian/0000-0002-6156-7874 NR 18 TC 47 Z9 49 U1 1 U2 12 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 DEC 1 PY 1993 VL 48 IS 21 BP 15886 EP 15892 DI 10.1103/PhysRevB.48.15886 PG 7 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100046 ER PT J AU WATSON, GI CANRIGHT, GS AF WATSON, GI CANRIGHT, GS TI FRUSTRATION-INDUCED DISORDER OF FLUX-LINE STRUCTURES IN LAYERED SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID MEAN-FIELD THEORY; SURFACE SEGREGATION; LATTICE STRUCTURES; VORTEX LATTICE; ISING-MODEL; PHYLLOTAXIS; TEMPERATURE; ALLOYS AB As an example of a system with competing (frustrated) interactions, we study a model of the spatial arrangement of flux lines in a layered superconductor, with the magnetic field parallel with the layers, and in the limit of strong pinning to the layers. In this approach, we approximate the energy-minimization problem by a discrete nonlinear dynamical system, in which a vortex structure is built up one layer at a time. We find a complex variety of metastable states nearly degenerate with the ground state, including lattices with unit cells of many layer spacings, and disordered structures which correspond to chaotic trajectories of the dynamical map. The latter case provides an example of (metastable) quenched disorder in a model with no intrinsic randomness. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP WATSON, GI (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 21 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 15950 EP 15956 DI 10.1103/PhysRevB.48.15950 PG 7 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100054 ER PT J AU RADTKE, RJ LEVIN, K SCHUTTLER, HB NORMAN, MR AF RADTKE, RJ LEVIN, K SCHUTTLER, HB NORMAN, MR TI ROLE OF VANHOVE SINGULARITIES AND MOMENTUM-SPACE STRUCTURE IN HIGH-TEMPERATURE SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Article ID DEPENDENT ELECTRONIC DENSITY; COPPER OXIDES; NEUTRON-SCATTERING; NORMAL-STATE; TC; YBA2CU3O6+X; APPROXIMATION; FLUCTUATIONS; EXCHANGE; SYSTEMS AB There is a great deal of interest in attributing the high critical temperatures of the cuprates to either the proximity of the Fermi level to a Van Hove singularity or to structure of the superconducting pairing potential in momentum space far from the Fermi surface- the latter is particularly important for spin-fluctuation-mediated pairing mechansims. We examine these ideas by calculating the critical temperature T(c) for model Einstein-phonon- and spin-fluctuation-mediated superconductors within both the standard, Fermi-surface-restricted Eliashberg theory and the exact Eliashberg theory, which accounts for the full momentum structure of the pairing potential and the energy dependence of the density of states. Our computations employ band structures chosen to model both the La2Sr2-xCuO4 and YBa2CU307-delta families. For our spin fluctuation calculations, we take the dynamical susceptibility to be the pairing potential and examine two models of this susceptibility in the cuprates. We compare and contrast these models with available magnetic neutron-scattering data, since these data provide the most direct constraints on the susceptibility. We conclude that a model constrained by neutron-scattering measurements will not yield the observed 90-K T(c)'s regardless of the strength of the electron-spin fluctuation coupling, even when the Van Hove singularity and momentum-space structure are accounted for; moreover, when transport constraints are applied to this type of model, we expect T(c) almost-equal-to 10 K, as was found in an earlier paper. We also find that the Van Hove singularity enhances T(c) much less effectively than weak-coupling calculations would suggest. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. UNIV GEORGIA,DEPT PHYS & ASTRON,ATHENS,GA 30602. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP RADTKE, RJ (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. RI Norman, Michael/C-3644-2013 NR 58 TC 47 Z9 47 U1 1 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 DEC 1 PY 1993 VL 48 IS 21 BP 15957 EP 15965 DI 10.1103/PhysRevB.48.15957 PG 9 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100055 ER PT J AU NIYAZ, P GUBERNATIS, JE SCALETTAR, RT FONG, CY AF NIYAZ, P GUBERNATIS, JE SCALETTAR, RT FONG, CY TI CHARGE-DENSITY-WAVE-GAP FORMATION IN THE 2-DIMENSIONAL HOLSTEIN MODEL AT HALF-FILLING SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL HUBBARD-MODEL; ELECTRON-PHONON MODEL; MAXIMUM-ENTROPY; SUPERCONDUCTIVITY AB We use a combination of quantum Monte Carlo (QMC) methods and analytic continuation techniques to study the formation of charge-density-wave (CDW) gaps at half-filling in the two-dimensional Holstein model. From QMC data for the dressed unequal-time Green's function G(tau,p) we calculate the real frequency spectral function A (omega, p) for different temperatures T, electron-phonon coupling constants g, phonon frequencies omega0, and spatial lattice sizes N. We also compute the spectral functions by approximate diagrammatic methods and find these results to be in good qualitative agreement with the QMC results. We discuss attempts to get quantitative agreement for a range of T and omega0 by using a single renormalized vertex gBAR in place of g, an approach that proved useful in previous studies of the Hubbard model. Finally, comparisons are made with previous estimates of the CDW transition temperature based on measurements of static correlation functions and susceptibilities. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP NIYAZ, P (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 27 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 16011 EP 16022 DI 10.1103/PhysRevB.48.16011 PG 12 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100062 ER PT J AU RODRIGUEZ, JP LEDERER, P AF RODRIGUEZ, JP LEDERER, P TI STRONGLY CORRELATED 2-DIMENSIONAL ELECTRONS IN THE OVERDOPED LIMIT SO PHYSICAL REVIEW B LA English DT Article ID T-J MODEL; VALENCE-BOND STATE; PHASE-TRANSITIONS; SUPERCONDUCTIVITY; RESISTIVITY; FIELDS AB A square-lattice gauge-theory model for the holon liquid existing in the unconventional metallic phases of strongly interacting two-dimensional electron liquids is introduced. The phase of the holon order parameter couples in a gauge-invariant way to a statistical gauge field, which arises from strong-interaction physics. We find that the superfluid transition that exists in the absence of statistical gaugefield excitations in the holon liquid turns into a crossover phenomenon in the presence of such fluctuations. The corresponding high-temperature phase shows a T-linear resistance, while the low-temperature phase exhibits a T2 dependence for the resistance. The crossover temperature scale T(c0) vanishes, however, in the limit of maximum statistical fluctuations. While we find that statistical gauge-field excitations are strictly gapless, the residue of the pole corresponding to such excitations becomes exponentially small at temperatures small in comparison to T(c0). C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV PARIS 11,PHYS SOLIDE LAB,F-91405 ORSAY,FRANCE. RP RODRIGUEZ, JP (reprint author), CALIF STATE UNIV LOS ANGELES,DEPT PHYS & ASTRON,LOS ANGELES,CA 90032, USA. NR 28 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 16051 EP 16055 DI 10.1103/PhysRevB.48.16051 PG 5 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100066 ER PT J AU CHOU, H SHAPIRO, SM AF CHOU, H SHAPIRO, SM TI OBSERVATION OF PREDICTED PHONON ANOMALIES IN BETA-PHASE NI50AL50 SO PHYSICAL REVIEW B LA English DT Note ID TRANSITION-METALS AB Inelastic neutron scattering was used in a detailed measure of the [zetazetazeta] transverse-acoustic (TA) and the [zeta00] longitudinal-acoustic (LA) branches in Ni50Al50 alloy. Anomalies are observed in the TA branch near zeta=0.28 and the LA branch near zeta=0.30 which are the precise wave vectors predicted by Zhao and Harmon in their calculations of the electron-phonon coupling in Ni50Al50. RP CHOU, H (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 15 TC 5 Z9 5 U1 2 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 DEC 1 PY 1993 VL 48 IS 21 BP 16088 EP 16090 DI 10.1103/PhysRevB.48.16088 PG 3 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100073 ER PT J AU LEWIS, SP COHEN, ML AF LEWIS, SP COHEN, ML TI THEORETICAL-STUDY OF HIGH-PRESSURE ORTHORHOMBIC SILICON SO PHYSICAL REVIEW B LA English DT Note ID PHASE-TRANSITIONS AB Ab initio calculations of the structural properties of a recently discovered body-centered orthorhombic phase of Si are presented. This high-pressure phase (denoted Imma after its space group) was observed at pressures between the transition pressures for the beta-Sn and simple hexagonal (sh) phases of Si. Total-energy calculations indicate that the optimal Imma structure varies with cell volume from the beta-Sn structure at large volumes to the sh structure at small volumes when all three structures are described in terms of the Imma unit cell. The energy of the Imma phase is found to be lower than or equal to the energies of the beta-Sn and sh phases for all cell volumes. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 17 TC 41 Z9 42 U1 1 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 DEC 1 PY 1993 VL 48 IS 21 BP 16144 EP 16147 DI 10.1103/PhysRevB.48.16144 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100089 ER PT J AU HUANG, XZ BISHOP, AR AF HUANG, XZ BISHOP, AR TI LATTICE-SPIN AND SPIN-POLARONIC DEFECTS IN ANTIFERROMAGNETIC HALOGEN-BRIDGED TRANSITION-METAL CHAIN COMPOUNDS SO PHYSICAL REVIEW B LA English DT Note ID CHARGE-DENSITY; FLUCTUATIONS; COMPLEXES; STATES; WAVES AB The results of many-body modeling are reported for polaronic defect excitations in the nickel-based halogen-bridged chain compounds, exemplified by NiBr. One-electron band structures and Raman scattering amplitudes, for electron and hole polarons and bipolarons, triplet excitons, negative, neutral, and positive solitons, are qualitatively described. A singlet exciton is found to be unstable with our model parameters, due to the large on-site Hubbard repulsion. Most significantly, the local defect excitations exhibit a substantial lattice distortionrelative to the undistorted antiferromagnetic spin background. The stoichiometric lattice symmetry is therefore broken locally, resulting in Paman activity, which is unexpected on the basis of the stoichiometric ground-state symmetry. RP HUANG, XZ (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 21 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 16148 EP 16151 DI 10.1103/PhysRevB.48.16148 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100090 ER PT J AU GRONBECHJENSEN, N CAI, D SAMUELSEN, MR AF GRONBECHJENSEN, N CAI, D SAMUELSEN, MR TI STABILITY OF BUNCHED FLUXONS IN MAGNETICALLY COUPLED JOSEPHSON-JUNCTIONS SO PHYSICAL REVIEW B LA English DT Note ID SOLITON OSCILLATORS; TUNNEL-JUNCTIONS; DYNAMICS; EXCITATIONS; LOCKING; SYSTEMS; ARRAYS AB The stability of bunched fluxon states in inductively coupled Josephson junctions is analyzed for fluxons of both equal and opposite polarity. We demonstrate that unipolar fluxons may form stable bunched states if the velocity is above a given threshold. The stability of these bunched states is based on the existence of two characteristic velocities in the coupled system. The result of analytical stability analysis is in excellent agreement with the results of numerical simulations. C1 TECH UNIV DENMARK,DEPT PHYS,DK-2800 LYNGBY,DENMARK. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 24 TC 45 Z9 45 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 DEC 1 PY 1993 VL 48 IS 21 BP 16160 EP 16163 DI 10.1103/PhysRevB.48.16160 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100093 ER PT J AU WANG, ZN SHI, DL AF WANG, ZN SHI, DL TI EXPRESSION FOR THE TIME-DEPENDENCE OF CURRENT-DENSITY WITH AVALANCHE DYNAMICS IN TYPE-II SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID FLUX CREEP; MAGNETIC-RELAXATION; SINGLE-CRYSTAL; IRREVERSIBILITY; BI2SR2CACU2OX; TEMPERATURE; FIELD AB Based on the concept of self-organized criticality, we have developed an expression for the current decay of type-II superconductors: j=j(c)-j(c)[kT/U0ln(l+betat/tau)]1/beta. This expression can be a general description of current decay in a wide range of j. Magnetic-relaxation experimental results in both high-T(c) superconductors (single crystals of YBa2Cu30x and Bi2Sr2CaCu2Ox) and conventional type-II superconductors (multifilamentary wire of Nb3Sn) have shown excellent agreement with our theoretical predication. Several microscopic parameters such as the characteristic energy and the characteristic time for these type-II superconductors have been extracted from the experimental data. C1 IIT,DEPT PHYS,CHICAGO,IL 60616. RP WANG, ZN (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 20 TC 15 Z9 15 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 16176 EP 16179 DI 10.1103/PhysRevB.48.16176 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100097 ER PT J AU GHIRON, K SALAMON, MB HUBBARD, MA VEAL, BW AF GHIRON, K SALAMON, MB HUBBARD, MA VEAL, BW TI UNIVERSAL TREND IN THE HEAT-CAPACITY OF YBA2CU3O7-X NEAR T(C)(X) SO PHYSICAL REVIEW B LA English DT Note ID OXYGEN DEFICIENT YBA2CU3O7-DELTA; II SUPERCONDUCTORS; CRYSTALS; DISORDER; DENSITY; TC AB The reduction in transition temperature that occurs as oxygen is removed from YBa2CU307-x is accompanied by a rapid decrease in the size of the heat-capacity anomaly at T(c). We treat the fluctuation effects in the context of XY-like behavior and demonstrate that their dependence on the transition temperature agrees in detail with a relationship between T(c) and the hole concentration proposed by Schneider and Keller. Further, we show that this empirical relationship can be understood by combining scaling arguments with the nearly antiferromagnetic Fermi-liquid model of Monthoux and Pines. C1 UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. ARGONNE NATL LAB,ARGONNE,IL 60439. RP GHIRON, K (reprint author), UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801, USA. NR 27 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 21 BP 16188 EP 16191 DI 10.1103/PhysRevB.48.16188 PG 4 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100100 ER PT J AU AHUJA, R WILLS, JM JOHANSSON, B ERIKSSON, O AF AHUJA, R WILLS, JM JOHANSSON, B ERIKSSON, O TI CRYSTAL-STRUCTURES OF TI, ZR, AND HF UNDER COMPRESSION - THEORY SO PHYSICAL REVIEW B LA English DT Article ID GROUP-IV METALS; TOTAL-ENERGY CALCULATIONS; BCC PHASE; PHONON-DISPERSION; TRANSITION-METALS; BRILLOUIN-ZONE; SPECIAL POINTS; BAND; STABILITY; PRESSURE AB We have studied the crystal structures of Ti, Zr, and Hf under pressure by means of first-principles, total-energy calculations. The three metals are shown to exhibit a crystal structure sequence hcp --> omega --> bcc, with increasing pressure. This is in good agreement with experiment for Zr and Hf, whereas the bcc structure for Ti is a prediction. The calculated transition volumes as well as transition pressures compare fairly well with experiment. Also, the computed c/a ratio for hcp Ti, Zr, and Hf is found to be in good agreement with experiment. Similarly the calculated c/a ratio for Zr in the omega structure agrees well with measurement. The chemical bonding of the omega structure is shown to be quite different from what is normally the case in the transition metals, with a large degree of covalency. A search for the omega structure in Tc and Ru was fruitless yielding a stable hcp structure. At zero temperature and zero pressure the bcc crystal structure is found to be mechanically unstable for Ti, Zr, and Hf. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP AHUJA, R (reprint author), UNIV UPPSALA,DEPT PHYS,BOX 530,S-75105 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 33 TC 155 Z9 155 U1 2 U2 20 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 DEC 1 PY 1993 VL 48 IS 22 BP 16269 EP 16279 DI 10.1103/PhysRevB.48.16269 PG 11 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000007 ER PT J AU VANEK, J STERNE, PA GONIS, A AF VANEK, J STERNE, PA GONIS, A TI PHASE-STABILITY OF PLUTONIUM SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; CRYSTAL-STRUCTURE; ACTINIDE METALS; MOMENT; STATES AB Results of electronic-structure calculations on the experimentally observed low-temperature monoclinic alpha phase of Pu are presented and compared to calculations for fcc (delta phase) and fictitious hexagonal Pu. Energy-volume curves for fcc and hexagonal phases of Pu reveal a tendency towards more open structures, primarily due to an increased occupation of the 6d band, which has a strongly itinerant character. Bonding in these structures is not dominated by the 5f band. However, in the experimental a phase, which is computed to be the most stable, the arrangement of the atoms in the unit cell is such that 5f bonding is strongly enhanced when compared with fcc and hexagonal Pu. In addition the alpha-Pu structure benefits from a substantial charge transfer from itinerant 7s states to the bonding 6d states. A relative downward shift of the 5f band reduces the width of the valence band in alpha-Pu. The predicted narrowing should be observable in photoemission experiments on alpha- and delta-Pu. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP VANEK, J (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,L-268,POB 808,LIVERMORE,CA 94551, USA. NR 23 TC 35 Z9 35 U1 2 U2 6 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 DEC 1 PY 1993 VL 48 IS 22 BP 16280 EP 16289 DI 10.1103/PhysRevB.48.16280 PG 10 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000008 ER PT J AU SCHMIEDESHOFF, GM FISK, Z SMITH, JL AF SCHMIEDESHOFF, GM FISK, Z SMITH, JL TI ANOMALOUS MAGNETIC TORQUE IN UBE13 - EVIDENCE FOR A FIELD-INDUCED MAGNETIC PHASE-TRANSITION SO PHYSICAL REVIEW B LA English DT Article ID FERMION SUPERCONDUCTOR UBE13; LOW-TEMPERATURE MAGNETORESISTIVITY; HIGH-PRESSURE; URU2SI2; ORDER; UPT3; FEATURES AB Measurements of the magnetic force and magnetic torque acting upon single-crystal and polycrystal samples of the heavy-fermion superconductor UBe13 have been made at temperatures from 60 mK to 30.0 K and in magnetic fields to 23 T using a capacitive magnetometer. The magnetic susceptibility deduced from the magnetic force is in reasonably good agreement with measurements using conventional techniques. We find that a large, anomalous contribution to the magnetic torque (AMT) appears in fields above 3-5 T at low temperature and at temperatures below about 7-12 K in high fields. The AMT coexists with the superconducting state at low temperature. We propose that the AMT reflects the existence of a field-induced magnetic phase transition. The presence of such a phase transition is consistent with specific-heat, thermopower, magnetoresistance, and Hall-effect measurements. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SCHMIEDESHOFF, GM (reprint author), OCCIDENTAL COLL,DEPT PHYS,LOS ANGELES,CA 90041, USA. NR 53 TC 13 Z9 13 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 DEC 1 PY 1993 VL 48 IS 22 BP 16417 EP 16424 DI 10.1103/PhysRevB.48.16417 PG 8 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000022 ER PT J AU MAHAN, GD AF MAHAN, GD TI ELECTRON-PHONON INTERACTION NEAR VANHOVE SINGULARITIES SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; OXIDE SUPERCONDUCTORS; CU-O; DENSITY; STATES AB The Eliashberg equations are solved in two dimensions for the transition temperature of a superconductor. The density of states has a logarithmic singularity. We show that the singularity in the density of states has only a small influence on the numerical solutions to the Eliashberg equations, apart from its contributions to the electron-phonon interaction lambda. We also consider the effects of the angular dependence of the gap around the Fermi line which occur for s-wave pairing. C1 UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. RP OAK RIDGE NATL LAB, DIV SOLID STATE, POB 2008, OAK RIDGE, TN 37831 USA. NR 35 TC 28 Z9 28 U1 1 U2 1 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 DEC 1 PY 1993 VL 48 IS 22 BP 16557 EP 16563 DI 10.1103/PhysRevB.48.16557 PG 7 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000038 ER PT J AU MARKING, G FRANZEN, HF OSTENSON, JE LING, MM FINNEMORE, DK LAABS, FC AF MARKING, G FRANZEN, HF OSTENSON, JE LING, MM FINNEMORE, DK LAABS, FC TI SUPERCONDUCTIVITY IN THE ZR9NB4S4 KAPPA-PHASE SO PHYSICAL REVIEW B LA English DT Article ID REVERSIBLE MAGNETIZATION AB Superconductivity is reported for a Zr-Nb-S kappa-phase material, a compound with highly anisotropic chemical bonding. It is composed of transition-metal icosahedral clusters that are face sharing along the c axis and give metal-metal bonding in that direction. In the a-b plane, the icosahedral clusters are joined by covalent sulfur bonds. The fundamental thermodynamic properties of these superconducting Zr9Nb4S4 compounds have been studied in order to determine whether the anisotropic chemical bonding of this structure would lead to unusual superconducting properties. The thermodynamic critical field H, roughly follows the BCS prediction with a transition temperature of 10.3 K, a value of the critical field at T = 0 of mu0H0 = 250 mT, and the Ginsburg-Landau parameter of about kappa = 30. The thermodynamic properties are very similar to transition-metal superconductors like vanadium. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP MARKING, G (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 8 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1993 VL 48 IS 22 BP 16630 EP 16633 DI 10.1103/PhysRevB.48.16630 PG 4 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000046 ER PT J AU FAINSTEIN, A BUTERA, A ZYSLER, RD TOVAR, M RETTORI, C RAO, D OSEROFF, SB FISK, Z CHEONG, SW VIER, DC SCHULTZ, S AF FAINSTEIN, A BUTERA, A ZYSLER, RD TOVAR, M RETTORI, C RAO, D OSEROFF, SB FISK, Z CHEONG, SW VIER, DC SCHULTZ, S TI FIELD-INDUCED SPIN REORIENTATION IN EU2CUO4GD STUDIED BY MAGNETIC-RESONANCE SO PHYSICAL REVIEW B LA English DT Article ID WEAK FERROMAGNETISM; R2CUO4; ND2CUO4; TB; DY; HO; ER; TM AB We report a magnetic-resonance study of Gd-doped Eu2CuO4 single crystals. Cooling the samples in a magnetic field H(FC), induces weak ferromagnetism (WF), with a strong out-of-plane anisotropy determined by the Dzyaloshinsky-Moriya (DM) interaction. In addition, there is in-plane anisotropy with an easy-axis parallel to the [110] crystal axis closest to H(FC). An intense resonance mode is observed at the X band (9.5 GHz) when H(FC) is applied parallel to one of the [110] axes and the measuring field is rotated by 90-degrees in the CuO2 plane. At the Q band (35 GHz), the in-plane resonance modes strongly depend on angle and temperature. We analyze the experimental results in terms of a phenomenological model for the magnetic free energy, which predicts a reorientation transition of the WF component of the magnetization m(WF) induced by the external field. Associated with this transition, a softening of the WF magnetic resonance mode occurs when the external field is applied perpendicular to the easy magnetization axis. The resulting angular variation of the resonance modes depends on whether the energy gap for the magnetic excitations is larger or smaller than the microwave energy. From the resonance data we have determined both the out-of-plane and in-plane anisotropy fields, H(DM)(T) and H(ax)(T), respectively. The extrapolated values for T = 0 are H(DM) (0) = 3.5(5) X 10(5) G and H(ax)(0) = 12(2) G. Both anisotropy fields decrease with increasing T, vanishing around T(N) congruent-to 243 K. The temperature dependence of the peak-to-peak linewidths, DELTAH(pp) measured at the X and Q bands is explained in terms of a temperature-independent frequency linewidth, DELTAomega1/2/gamma = 1.6(2) kG. Nonresonant absorption losses around the maxima and minima of the omega/gamma vs H curves are also described in terms of this finite width for the resonance modes. C1 COMIS NACL ENERGIA ATOM, CTR ATOM BARILOCHE, RA-8400 BARILOCHE, RIO NEGRO, ARGENTINA. COMIS NACL ENERGIA ATOM, INST BALSEIRO, RA-8400 BARILOCHE, RIO NEGRO, ARGENTINA. SAN DIEGO STATE UNIV, SAN DIEGO, CA 92182 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92037 USA. RI Rettori, Carlos/C-3966-2012 OI Rettori, Carlos/0000-0001-6692-7915 NR 29 TC 12 Z9 12 U1 0 U2 0 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 DEC 1 PY 1993 VL 48 IS 22 BP 16775 EP 16784 DI 10.1103/PhysRevB.48.16775 PG 10 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000061 ER PT J AU BATCHELDER, JC MOLTZ, DM OGNIBENE, TJ ROWE, MW TIGHE, RJ CERNY, J AF BATCHELDER, JC MOLTZ, DM OGNIBENE, TJ ROWE, MW TIGHE, RJ CERNY, J TI BETA-DELAYED PROTON DECAY OF SR-73 SO PHYSICAL REVIEW C LA English DT Article AB The T(z) = -3/2, A = 4n + 1 nuclide 73Sr produced in the Ca-40(Ar-36, 3n) reaction has been observed via beta-delayed proton emission. A single proton group at a laboratory energy of 3.75+/-0.04 MeV has been observed, corresponding to decay of the T = 3/2 isobaric analog state in 73Rb to the ground state of 72Kr. Combining this measurement with a Coulomb displacement energy calculation yields & mass excess for 73Sr of - 31.82+/-0.24 MeV based on a predicted mass for 72Kr of - 53.94+/-0.24 MeV. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BATCHELDER, JC (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 22 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1993 VL 48 IS 6 BP 2593 EP 2597 DI 10.1103/PhysRevC.48.2593 PG 5 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800006 ER PT J AU BENOFY, LP GAMMEL, JL DELANEY, RM BAKER, GA AF BENOFY, LP GAMMEL, JL DELANEY, RM BAKER, GA TI GROUND-STATE ENERGY OF A HARD-SPHERE FERMI FLUID .2. SPIN AND ISOSPIN SO PHYSICAL REVIEW C LA English DT Article ID RANGE EXPANSION PARAMETERS; SERIES AB We evaluate the fourth-order Hugenholtz diagrams from the Rayleigh-Schrodinger many-body perturbation series for a repulsive, square-well potential. We consider a system containing four different equal-mass identically interacting particle species, similar to nuclear matter when only the repulsive core is considered. We use the results of these calculations to extend the L expansion of the ground-state energy of a Fermi fluid by one more term. From this extension, we are able to provide accurate values of the ground-state energy over a density range which includes that for infinite nuclear matter. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP ST LOUIS UNIV, DEPT PHYS, ST LOUIS, MO 63103 USA. NR 29 TC 2 Z9 2 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 DEC PY 1993 VL 48 IS 6 BP 2685 EP 2696 DI 10.1103/PhysRevC.48.2685 PG 12 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800019 ER PT J AU PICKAR, MA BACHER, AD HUGI, M MEYER, HO POLLOCK, RE EMERY, GT KARWOWSKI, HJ HALL, JR FATYGA, M AF PICKAR, MA BACHER, AD HUGI, M MEYER, HO POLLOCK, RE EMERY, GT KARWOWSKI, HJ HALL, JR FATYGA, M TI NEAR-THRESHOLD PROTON-INDUCED NEUTRAL PION-PRODUCTION FROM C-12 SO PHYSICAL REVIEW C LA English DT Article ID RECOIL DETECTION; CROSS-SECTIONS; DEUTERIUM AB The total cross section and angular distributions for the differential cross section and the analyzing power of the exclusive two-body pion production reaction C-12(p -->, pi0)N-13g.s. have been measured at 147 MeV, very near the threshold energy of 145 MeV. Both the large forward-backward asymmetry in the angular distribution of the differential cross section and the large values observed for the analyzing powers indicate strong interference between the amplitude for s-wave pion emission and the amplitudes for p-wave pion emission. A phase-shift analysis performed on these new data yields significant p-wave strength at this low energy. The measurements for pi0 production from carbon are in agreement with results extracted from existing data for pi+ production from carbon, after corrections for isospin invariance and Coulomb effects. The reduced s-wave strength is found to have a simple power law dependence on the total number of nucleons in the final bound state. C1 INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405. BOWDOIN COLL,DEPT PHYS,BRUNSWICK,ME 04011. UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC 27514. UNIV NEW MEXICO,DEPT PHYS,ALBUQUERQUE,NM 87131. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP PICKAR, MA (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 24 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1993 VL 48 IS 6 BP 2763 EP 2771 DI 10.1103/PhysRevC.48.2763 PG 9 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800027 ER PT J AU RENTSCH, D METAG, V NOVOTNY, R PELTE, D SHAPIRA, D AF RENTSCH, D METAG, V NOVOTNY, R PELTE, D SHAPIRA, D TI MULTIFRAGMENT EVENTS IN THE REACTION NI-58+AL-27 AT 15.8 MEV/NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID COMPLEX-FRAGMENT EMISSION; HEAVY-ION REACTIONS; NUCLEAR FRAGMENTATION; STATISTICAL MULTIFRAGMENTATION; PARTICLE-EMISSION; BOMBARDING ENERGY; PHASE-TRANSITION; HOT NUCLEI; COLLISIONS; DECAY AB Intermediate mass fragment (IMF) production was studied in the inverse kinematics reaction Ni-58+Al-27 at 15.8 MeV/nucleon bombarding energy using the Heavy Ion Light Ion (HILI) detector. Exit channels with up to 4 IMFs have been observed. The three-body events can be ascribed to different production mechanisms: (i) incomplete momentum transfer with projectile spectator breakup, (ii) sequential fission following a deep inelastic reaction, and. (iii) fast sequential fission (i.e., with Coulomb final-state interaction) in competition with a prompt breakup out of a toroidal configuration. The identified ternary reaction mechanisms, covering an extremely wide dynamic range, could be observed simultaneously; a subgroup of events is compatible with an instantaneous breakup of a highly excited nuclear system. C1 UNIV HEIDELBERG, INST PHYS, D-69029 HEIDELBERG, GERMANY. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP UNIV GIESSEN, INST PHYS 2, D-35392 GIESSEN, GERMANY. NR 56 TC 3 Z9 3 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1993 VL 48 IS 6 BP 2789 EP 2799 DI 10.1103/PhysRevC.48.2789 PG 11 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800030 ER PT J AU JONES, MK RANSOME, RD CUPPS, VR FERGERSON, RW MORRIS, CL MCGILL, JA ZUMBRO, JD COMFORT, JR RITCHIE, BG TINSLEY, JR GUGELOT, PC MOORE, CF AF JONES, MK RANSOME, RD CUPPS, VR FERGERSON, RW MORRIS, CL MCGILL, JA ZUMBRO, JD COMFORT, JR RITCHIE, BG TINSLEY, JR GUGELOT, PC MOORE, CF TI PION ABSORPTION ABOVE THE DELTA(1232) RESONANCE SO PHYSICAL REVIEW C LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; HE-4; PI+; NUCLEI; REGION; SCATTERING; ENERGIES; CARBON; LI-6 AB Two-proton and three-proton inclusive pi+ absorption cross sections were measured for incident pion energies from 250 to 500 MeV on targets of C-12, N-58, Zr-90, Sn-118, and Pb-208 using a large solid angle bismuth germanate detector array. Pion absorption events leading to three or more protons in the final state were observed to become more significant with increasing incident pion energy and were dominant at 500 MeV. The total absorption cross sections were inferred from analyses of the data with uncertainties of approximately 25%. C1 RUTGERS UNIV,PISCATAWAY,NJ 08855. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV PENN,PHILADELPHIA,PA 19104. ARIZONA STATE UNIV,TEMPE,AZ 85287. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22901. UNIV TEXAS,AUSTIN,TX 78712. NR 38 TC 41 Z9 41 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 DEC PY 1993 VL 48 IS 6 BP 2800 EP 2817 DI 10.1103/PhysRevC.48.2800 PG 18 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800031 ER PT J AU BARRETO, JL NICOLIS, NG SARANTITES, DG CHARITY, RJ SOBOTKA, LG STRACENER, DW HENSLEY, DC BEENE, JR BAKTASH, C HALBERT, M THOENNESSEN, M AF BARRETO, JL NICOLIS, NG SARANTITES, DG CHARITY, RJ SOBOTKA, LG STRACENER, DW HENSLEY, DC BEENE, JR BAKTASH, C HALBERT, M THOENNESSEN, M TI SEARCH FOR ENTRANCE CHANNEL EFFECTS IN THE DECAY OF THE YB-164 COMPOUND NUCLEUS AT E-ASTERISK-APPROXIMATE-TO-54 MEV SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION FUSION; EVEN-EVEN NUCLIDES; ANGULAR-MOMENTUM; SUBBARRIER FUSION; NEUTRON EMISSION; CROSS-SECTIONS; RESPONSE CHARACTERISTICS; MULTIDETECTOR SYSTEM; SUPPRESSION; COLLISIONS AB The existence of entrance channel effects in the decay of 164Yb*, formed at E* almost-equal-to 54 MeV in the reactions O-16 + Sm-148 and 64Ni + Mo-100 is investigated. Evaporation residue cross sections, entry state gamma-ray fold distributions as well as energy and angular distributions of exit-channel selected charged particles were obtained for each reaction, using 4pi detection systems for both particles and gamma rays. In the 64Ni-induced reaction, the center-of-mass alpha-particle angular distributions were found to be symmetric around 90-degrees indicating emission from a fully equilibrated compound nucleus. However, the corresponding angular distributions in the O-16-induced reaction show a forward component which exclusively affects the population of the alphaxn residue channels. The gamma-ray fold distributions for the alphaxn and xn channels show differences depending on the entrance channel as reported previously for similar systems. These differences can be understood in terms, of contributions from the equilibrium decay of incompletely fused O-16 with Sm-148 and the mapping of the compound nucleus spin distributions, obtained from realistic fusion models, to the evaporation residue gamma-ray fold distributions. It is concluded that the initial population of the compound nucleus is the only reason for the observed differences in the decay of 164Yb* populated in these reactions. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP BARRETO, JL (reprint author), WASHINGTON UNIV,DEPT CHEM,ST LOUIS,MO 63130, USA. NR 43 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 DEC PY 1993 VL 48 IS 6 BP 2881 EP 2894 DI 10.1103/PhysRevC.48.2881 PG 14 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800039 ER PT J AU CHINN, CR ELSTER, C THALER, RM AF CHINN, CR ELSTER, C THALER, RM TI MICROSCOPIC FORMULATION OF MEDIUM CONTRIBUTIONS TO THE 1ST-ORDER OPTICAL-POTENTIAL SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS ELASTIC-SCATTERING; FULL-FOLDING-MODEL; INTERMEDIATE ENERGIES; PAULI PRINCIPLE; MESON-EXCHANGE; FINITE NUCLEI; PROTONS; CA-40 AB A refinement of the first-order optical potential is introduced, consistent with multiple scattering theory and the spectator expansion. A systematic formalism is presented to treat medium contributions associated with the difference between the effective NN t matrix as required by multiple scattering theory and the free NN t matrix. A mean field potential is used to represent the action of the residual (A - 1) nucleus upon the struck target nucleon (medium effects). We calculate elastic proton and neutron scattering from Ca-40, using the full Bonn interaction and two different mean field potentials taken from realistic and proven nuclear structure models. Results indicate that the medium contributions are insignificant at energies above 300 MeV and provide a significant improvement of the theoretical predictions for laboratory energies between 48 and 200 MeV. C1 OAK RIDGE NATL LAB,CTR COMPUTAT INTENS PHYS,OAK RIDGE,TN 37831. CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. RP CHINN, CR (reprint author), VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235, USA. RI Elster, Charlotte/N-9845-2015 NR 49 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1993 VL 48 IS 6 BP 2956 EP 2966 DI 10.1103/PhysRevC.48.2956 PG 11 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800047 ER PT J AU DIEBOLD, GE BASSALLECK, B BURGER, T BURGER, M CHRIEN, R ENYO, H FRANKLIN, G FRANZ, J IIJIMA, T IMAI, K LOWE, J MAGAHIZ, R MASAIKE, A MERRILL, F NELSON, JM OKADA, K PILE, PH QUINN, B ROSSLE, E RUSEK, A SAITO, N SAWAFTA, R SCHMITT, H SCHUMACHER, RA STEARNS, RL SUKATON, R SUTTER, R TAKEUTCHI, F WOLFE, DM YOKKAICHI, S ZEPS, V ZYBERT, R AF DIEBOLD, GE BASSALLECK, B BURGER, T BURGER, M CHRIEN, R ENYO, H FRANKLIN, G FRANZ, J IIJIMA, T IMAI, K LOWE, J MAGAHIZ, R MASAIKE, A MERRILL, F NELSON, JM OKADA, K PILE, PH QUINN, B ROSSLE, E RUSEK, A SAITO, N SAWAFTA, R SCHMITT, H SCHUMACHER, RA STEARNS, RL SUKATON, R SUTTER, R TAKEUTCHI, F WOLFE, DM YOKKAICHI, S ZEPS, V ZYBERT, R TI PRODUCTION OF PI-PLUS-OR-MINUS, K-PLUS-OR-MINUS, P, AND (P)BAR IN RELATIVISTIC AU+PT, SI+PT,AND P+PT COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID ANTIPROTON PRODUCTION; NUCLEAR COLLISIONS; 14.6A GEV/C AB During the recent commissioning of Au beams at the Brookhaven Alternating Gradient Synchrotron facility, experiment 886 measured production cross sections for pi+/-, K+/-, p, and pBAR in minimum bias Au + Pt collisions at 11.5A GeV/c. Invariant differential cross sections, E d3sigma/dp3, were measured at several rigidities (p/Z less-than-or-equal-to 1.8 GeV/c) using a 5.7-degrees (fixed-angle) focusing spectrometer. For comparison, particle production was measured in minimum bias Si + Pt collisions at 14.6A GeV/c using the same apparatus and in p + Pt collisions at 12.9 GeV/c using a similar spectrometer at KEK. When normalized to projectile mass, A(proj), the measured pi+/- and K+/- cross sections are nearly equal for the p + Pt and Si + Pt reactions. In contrast to this behavior, the pi- cross section measured in Au + Pt shows a significant excess beyond A(proj) scaling of the p + Pt measurement. This enhancement suggests collective phenomena contribute significantly to pi- production in the larger Au + Pt colliding system. For the Au + Pt reaction, the pi+ and K+ yields also exceed A(proj) scaling of p + Pt collisions. However, little significance can be attributed to these excesses due to larger experimental uncertainties for the positive rigidity Au beam measurements. For antiprotons, the Si + Pt and Au + Pt cross sections fall well below A(proj) scaling of the p + Pt yields indicating a substantial fraction of the nuclear projectile is ineffective for pBAR production. Comparing with p + Pt multiplicities, the Si + Pt and Au + Pt antiproton yields agree with that expected solely from ''first'' nucleon-nucleon collisions (i.e., collisions between previously unstruck nucleons). In light of expected pBAR annihilation in the colliding system, such projectile independence is unexpected without additional (projectile dependent) sources of pBAR production. In this case, the data indicate an approximate balance exists between absorption and additional sources of antiprotons. This balance is remarkable given the wide range of projectile mass spanned by these measurements. C1 KYOTO UNIV,DEPT PHYS,SAKYO KU,KYOTO 606,JAPAN. BROOKHAVEN NATL LAB,UPTON,NY 11973. CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. UNIV FREIBURG,FAK PHYS,D-79104 FREIBURG,GERMANY. UNIV NEW S WALES,KENSINGTON,NSW 2033,AUSTRALIA. KYOTO SANGYO UNIV,FAC SCI,KYOTO 603,JAPAN. VASSAR COLL,DEPT PHYS & ASTRON,POUGHKEEPSIE,NY 12601. YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06511. RP DIEBOLD, GE (reprint author), UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. RI Schumacher, Reinhard/K-6455-2013; Franklin, Gregg/N-7743-2014; Quinn, Brian/N-7343-2014; Yokkaichi, Satoshi/C-6215-2017 OI Schumacher, Reinhard/0000-0002-3860-1827; Franklin, Gregg/0000-0003-4176-1378; Quinn, Brian/0000-0003-2800-986X; NR 19 TC 24 Z9 24 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 DEC PY 1993 VL 48 IS 6 BP 2984 EP 2994 DI 10.1103/PhysRevC.48.2984 PG 11 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800050 ER PT J AU DACRUZ, MTF CHAN, Y GARCIA, A HINDI, MM KENCHIAN, G LARIMER, RM LESKO, KT NORMAN, EB STOKSTAD, RG WIETFELDT, FE ZLIMEN, I AF DACRUZ, MTF CHAN, Y GARCIA, A HINDI, MM KENCHIAN, G LARIMER, RM LESKO, KT NORMAN, EB STOKSTAD, RG WIETFELDT, FE ZLIMEN, I TI SEARCH FOR THE BETA+ DECAY OF MN-54 SO PHYSICAL REVIEW C LA English DT Note ID LIFETIME AB We have performed a search for the beta+ decay of Mn-54 by looking for back-to-back 511-keV gamma rays in two high-purity Ge detectors. No excess of events above background was observed, and a limit of 5.7 x 10(-7)% has been established for the beta+ branch. The significance of this result for the use of Mn-54 as a cosmic ray chronometer is discussed. C1 UNIV SAO PAULO,INST FIS,BR-01498 SAO PAULO,BRAZIL. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. TENNESSEE TECHNOL UNIV,DEPT PHYS,COOKEVILLE,TN 38505. RP DACRUZ, MTF (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 6 TC 8 Z9 8 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 DEC PY 1993 VL 48 IS 6 BP 3110 EP 3112 DI 10.1103/PhysRevC.48.3110 PG 3 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800060 ER PT J AU BEENE, JR HOREN, DJ SATCHLER, GR AF BEENE, JR HOREN, DJ SATCHLER, GR TI EXAMINATION OF INCONSISTENCIES BETWEEN THE DEFORMED POTENTIAL MODEL AND FOLDING MODELS FOR ANALYSIS OF INELASTIC HADRON SCATTERING SO PHYSICAL REVIEW C LA English DT Note AB It is customary to extract deformation lengths from inelastic scattering data by using a deformed optical potential. It is then assumed that this deformation length also characterizes the deformation of the underlying density distribution of the excited nucleus. This equivalence is exact for a dipole deformation, but this corresponds simply to a spurious excitation mode, namely a shift of the center of mass of the system. We show that, even when the potential is obtained by folding an effective interaction over the density distribution, the deformed potential model is not exact for other multipoles, except in the limit that the interaction has a zero range. The errors made when the interaction has a realistic finite range can be large. RP BEENE, JR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1993 VL 48 IS 6 BP 3128 EP 3130 DI 10.1103/PhysRevC.48.3128 PG 3 WC Physics, Nuclear SC Physics GA MM348 UT WOS:A1993MM34800066 ER PT J AU ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, CW SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T AF ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, CW SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI PERTURBATIVE QCD EFFECTS OBSERVED IN 490 GEV DEEP-INELASTIC MUON SCATTERING SO PHYSICAL REVIEW D LA English DT Article ID LEPTON-PROTON-SCATTERING; QUANTUM CHROMODYNAMICS; TRANSVERSE-MOMENTUM; AZIMUTHAL ASYMMETRY; HIGH-ENERGIES; LEPTOPRODUCTION; DISTRIBUTIONS AB Results on forward charged hadrons in 490 GeV deep-inelastic muon scattering are presented. The transverse momenta, azimuthal asymmetry, and energy flow of events with four or more forward charged hadrons are studied. The range of the invariant hadronic mass squared 300W(+/-)gamma+X-->l(+/-)nu gamma+X is calculated to O(alpha(s) for general CP-conserving WW gamma couplings. At the Fermilab Tevatron center-of-mass energy, the QCD corrections to W gamma production are modest, and the Born and inclusive O(alpha(s)) cross sections have similar sensitivities to the effects of anomalous couplings. At supercollider energies, the inclusive QCD corrections are large at high photon transverse momenta, reducing the sensitivity to nonstandard WW gamma couplings by up to a factor 2. The size of the QCD corrections can be reduced significantly, and a large fraction of the sensitivity lost can be regained, if a jet veto is imposed. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV DURHAM,DEPT PHYS,DURHAM DH1 3LE,ENGLAND. RP BAUR, U (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 105 TC 89 Z9 89 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 DEC 1 PY 1993 VL 48 IS 11 BP 5140 EP 5161 DI 10.1103/PhysRevD.48.5140 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MK289 UT WOS:A1993MK28900012 ER PT J AU BENLLOCH, JM WAINER, N GIELE, WT AF BENLLOCH, JM WAINER, N GIELE, WT TI SEARCH FOR THE TOP-QUARK IN THE HADRONIC DECAY CHANNEL SO PHYSICAL REVIEW D LA English DT Article ID NEUTRAL-CURRENT DECAYS; BACKWARD ASYMMETRY; CROSS-SECTION; UPPER LIMIT; B-QUARK; COLLISIONS; JET; FERMILAB; TEV AB The possibility of discovering the top quark and measuring its mass at the Fermilab Tevatron collider is studied for the pure hadronic decay channel, that is, the six jet final state. The most important aspects of a generic detector relevant for this study are included. By requiring tagging of a b-quark jet and applying cuts on the sphericity, aplanarity, and summed scalar transverse energy of the jets we obtain an acceptable signal-to-background ratio. In order to reduce the uncertainty in the measured three jet invariant mass distribution due to energy smearing, kinematical fit techniques are used. With the above methods we conclude that a top quark with a mass up to 180 GeV can be observed in the hadronic decay mode at the Tevatron with an integrated luminosity of 100 pb(-1). C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BENLLOCH, JM (reprint author), MIT,CAMBRIDGE,MA 02139, USA. OI Benlloch Baviera, Jose Maria/0000-0001-6073-1436 NR 29 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1993 VL 48 IS 11 BP 5226 EP 5232 DI 10.1103/PhysRevD.48.5226 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MK289 UT WOS:A1993MK28900022 ER PT J AU SONI, A XU, RM AF SONI, A XU, RM TI PROBING CP VIOLATION VIA HIGGS-BOSON DECAYS TO 4 LEPTONS SO PHYSICAL REVIEW D LA English DT Article ID HADRON SUPERCOLLIDERS; BARYON ASYMMETRY; BOSON; COLLIDERS; DOUBLETS; PHYSICS; PAIRS; MODEL; MASS AB Since decays to four leptons is widely considered a promising way to search for the Higgs particle, we show how the same final state can also be used to search for signals of CP nonconservation. Energy asymmetries and triple correlations are related to parameters in the underlying CP-violating effective interaction at the H-0-W-W and H-0-Z-Z vertices. It is argued that the expected size of the effects is extremely small in the standard model, and it is shown that the result also seems small to be observable in an extension of the standard model with an extra Higgs doublet. C1 SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794. RP SONI, A (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 27 TC 48 Z9 48 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 DEC 1 PY 1993 VL 48 IS 11 BP 5259 EP 5263 DI 10.1103/PhysRevD.48.5259 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MK289 UT WOS:A1993MK28900025 ER PT J AU RIZZO, TG AF RIZZO, TG TI MODEL OF UNIVERSALITY VIOLATION REEXAMINED SO PHYSICAL REVIEW D LA English DT Article AB The possibility that the interactions of the third generation of quarks and leptons may violate universality by a small amount remains an open experimental question. The model of Li and Ma, which naturally accommodates such violations, is found to be highly constrained by newly obtained, high precision electroweak and tau-lepton data once full standard model radiative corrections are incorporated into the analysis. A comparison of the predictions of this model with existing data and the expectations for future colliders is presented. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1993 VL 48 IS 11 BP 5286 EP 5292 DI 10.1103/PhysRevD.48.5286 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MK289 UT WOS:A1993MK28900029 ER PT J AU BELANGER, G GENG, CQ TURCOTTE, P AF BELANGER, G GENG, CQ TURCOTTE, P TI UPDATE ON RARE K AND B DECAYS IN THE 2-HIGGS-DOUBLET MODEL SO PHYSICAL REVIEW D LA English DT Note ID HEAVY TOP QUARK; CP-VIOLATION; MESON DECAY; 2-HIGGS-DOUBLET MODELS; QCD ENHANCEMENT; SECTOR; CONSTRAINTS; B->S-GAMMA AB The new CLEO measurement B(b-->s gamma)<5.4X10(-4) puts severe constraints on the parameters of the two-Higgs-doublet model. We find that m(H+)>320 GeV (540 GeV) for m(t) = 120 GeV (150 GeV). This new measurement implies that the planned rare kaon decay experiments will be insensitive to the charged Higgs boson. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP BELANGER, G (reprint author), UNIV MONTREAL,PHYS NUCL LAB,CP 6128,SUCC A,MONTREAL H3C 3J7,PQ,CANADA. NR 39 TC 0 Z9 0 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 DEC 1 PY 1993 VL 48 IS 11 BP 5419 EP 5421 DI 10.1103/PhysRevD.48.5419 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MK289 UT WOS:A1993MK28900043 ER PT J AU BARGER, V CHEUNG, K HAN, T ZEPPENFELD, D AF BARGER, V CHEUNG, K HAN, T ZEPPENFELD, D TI FINDING THE LEPTONIC WW DECAY MODE OF A HEAVY HIGGS-BOSON AT HADRON SUPERCOLLIDERS SO PHYSICAL REVIEW D LA English DT Note ID STRONG W+W+ SCATTERING; SSC AB We reanalyze the extraction of the heavy Higgs boson signal H --> W+W- --> <(l)over bar nu>, (l = e or mu) from the standard model background at hadron supercolliders, taking into account revised estimates of the top quark background. With new acceptance criteria the detection of the signal remains viable. Requiring a forward jet tag, a central jet veto, and a large relative transverse momentum of the two charged leptons yields S/root B > 6 for one year of running at the SSC or CERN LHC. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BARGER, V (reprint author), UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706, USA. RI Cheung, Kingman/A-8380-2008 OI Cheung, Kingman/0000-0003-2176-4053 NR 8 TC 23 Z9 23 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 DEC 1 PY 1993 VL 48 IS 11 BP 5433 EP 5436 DI 10.1103/PhysRevD.48.5433 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MK289 UT WOS:A1993MK28900047 ER PT J AU ALEXANDER, FJ HABIB, S KOVNER, A AF ALEXANDER, FJ HABIB, S KOVNER, A TI STATISTICAL-MECHANICS OF KINKS IN 1+1 DIMENSIONS - NUMERICAL SIMULATIONS AND DOUBLE-GAUSSIAN APPROXIMATION SO PHYSICAL REVIEW E LA English DT Article ID STRUCTURAL PHASE-TRANSITIONS; PAIR PRODUCTION; SINE-GORDON; EXCITATIONS; FIELDS AB We investigate the thermal equilibrium properties of kinks in a classical Phi(4) field theory in 1+1 dimensions. From large-scale Langevin simulations we identify the temperature below which a dilute-gas description of kinks is valid. The standard dilute-gas or WKB description is shown to be remarkably accurate below this temperature. At higher ''intermediate'' temperatures, where kinks still exist, this description breaks down. By introducing a double-Gaussian variational ansatz for the eigenfunctions of the statistical transfer operator for the system, we are able to study this region analytically. In particular, our predictions for the number of kinks and the correlation length are in agreement with the simulations. The double Gaussian prediction for the characteristic temperature at which the kink description ultimately breaks down is also in accord with the simulations. We also analytically calculate the internal energy and demonstrate that the peak in the specific heat near the kink characteristic temperature is indeed due to kinks. In the neighborhood of this temperature there appears to be an intricate energy-sharing mechanism operating between nonlinear phonons and kinks. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP ALEXANDER, FJ (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 24 TC 28 Z9 28 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 DEC PY 1993 VL 48 IS 6 BP 4284 EP 4296 DI 10.1103/PhysRevE.48.4284 PG 13 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400025 ER PT J AU JARZYNSKI, C AF JARZYNSKI, C TI ENERGY DIFFUSION IN A CHAOTIC ADIABATIC BILLIARD GAS SO PHYSICAL REVIEW E LA English DT Article ID INVARIANTS AB A diffusion equation is derived for the energy distribution of a gas of noninteracting point particles following chaotic trajectories inside a slowly-time-dependent container. We discuss the relevance of this problem to results concerning ergodic adiabatic Hamiltonian systems, as well as to one-body dissipation in nuclear dynamics. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP JARZYNSKI, C (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Jarzynski, Christopher/B-4490-2009 OI Jarzynski, Christopher/0000-0002-3464-2920 NR 23 TC 46 Z9 46 U1 0 U2 5 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 DEC PY 1993 VL 48 IS 6 BP 4340 EP 4350 DI 10.1103/PhysRevE.48.4340 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400031 ER PT J AU HU, YC ECKE, R AHLERS, G AF HU, YC ECKE, R AHLERS, G TI CONVECTION NEAR-THRESHOLD FOR PRANDTL NUMBERS NEAR 1 SO PHYSICAL REVIEW E LA English DT Article ID RAYLEIGH-BENARD CONVECTION; CYLINDRICAL CONTAINER; PATTERN-FORMATION; AXISYMMETRIC CONVECTION; WAVENUMBER SELECTION; DYNAMICS; TURBULENCE; FIELD; ROLLS AB Rayleigh-Benard convection in two cylindrical geometries with different sidewalls and with radius-to-height ratios Gamma=41 and 43 was studied with shadowgraph imaging and heat-transport measurements. The working fluid was CO2 at 25.3 bar with a Prandtl number sigma=0.93. For one of the cells (Gamma=43), axisymmetric convection rolls were stable above onset up to epsilon=Delta T/Delta T-c -1=0.19, where Delta T-c is the critical temperature difference. The amplitude of the center of the concentric patterns, the umbilicus, much larger near onset than that of the outlying region, grew as epsilon(beta 1), with beta(1) =O.27+/-0.04. Outside the umbilicus, the amplitude grew as epsilon(beta 2), with beta(2)=0.48+/-0.04. For Gamma=41, axisymmetric convection rolls, coexisting with an annular cross-roll state confined near the sidewall, were the preferred patterns above onset and remained stable up to an epsilon of 0.08. The umbilicus of the concentric convection pattern shifted slightly off center as epsilon was increased, but the shift never exceeded 50% of the cell depth. For epsilon > 0. 10, the patterns were unstable and evolved over many horizontal thermal diffusion times to straight-roll patterns with defects and grain boundaries. The process involved the umbilicus moving toward the sidewall, accompanied by radially traveling waves emitted by the umbilicus. While the umbilicus emitted, the crossrolls adjacent to the sidewall traveled parallel to the wan, and rolls were created and destroyed at a source and sink, respectively, presumably owing to large-scale flows generated by the off-centered position of the umbilicus. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,CTR NONLINEAR SCI,SANTA BARBARA,CA 93106. RP HU, YC (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. OI Ecke, Robert/0000-0001-7772-5876 NR 47 TC 49 Z9 49 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 DEC PY 1993 VL 48 IS 6 BP 4399 EP 4413 DI 10.1103/PhysRevE.48.4399 PG 15 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400037 ER PT J AU HUANG, H BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD CHAO, AW COLLINS, J DERENCHUK, V DUTT, S EAST, G ELLISON, M FRIESEL, D HAMILTON, B JONES, WP LEE, SY LI, D MINTY, MG NAGAITSEV, S NG, KY PEI, X RIABKO, A SLOAN, T SYPHERS, M TENG, L WANG, Y YAN, YT ZHANG, PL AF HUANG, H BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD CHAO, AW COLLINS, J DERENCHUK, V DUTT, S EAST, G ELLISON, M FRIESEL, D HAMILTON, B JONES, WP LEE, SY LI, D MINTY, MG NAGAITSEV, S NG, KY PEI, X RIABKO, A SLOAN, T SYPHERS, M TENG, L WANG, Y YAN, YT ZHANG, PL TI EXPERIMENTAL-DETERMINATION OF THE HAMILTONIAN FOR SYNCHROTRON MOTION WITH RF PHASE MODULATION SO PHYSICAL REVIEW E LA English DT Article AB Synchrotron motion with rf phase modulation was studied experimentally. Poincare maps in the resonant precessing frame were obtained from the experimental data and compared with the tori of the resonant Hamiltonian. Our experimental data revealed island structure in longitudinal phase space. Experimental results for synchrotron motion excited by phase modulation at the third harmonic of the synchrotron frequency are also reported. C1 SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. BROOKHAVEN NATL LAB,UPTON,NY 11973. ARGONNE NATL LAB,ARGONNE,IL 60439. RP HUANG, H (reprint author), INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405, USA. NR 23 TC 43 Z9 43 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 DEC PY 1993 VL 48 IS 6 BP 4678 EP 4688 DI 10.1103/PhysRevE.48.4678 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400068 ER PT J AU HEDSTROM, GW AF HEDSTROM, GW TI RAYLEIGH-WAVES FOR A DISCRETE ELASTIC PARAXIAL EQUATION SO PHYSICAL REVIEW E LA English DT Article ID BOUNDARY-VALUE-PROBLEMS; DIFFERENCE AB We investigate the effects of a free surface on the 45 degrees paraxial equation for Linear elasticity in a half space. We show that the 45 degrees equation has no Rayleigh wave and that it has an exponentially growing instability. We also examine a standard finite-difference approximation to the elastic paraxial equation. We show that the discrete equation also has an exponential instability, but this may be removed by projection. We also find that the discrete elastic paraxial equation has no Rayleigh waves when the mesh size is small, but a coarse mesh gives two Rayleigh waves. Moreover, by a proper choice of the mesh sizes, we may select a discretization so that one of these discrete Rayleigh waves has the speed of a physical Rayleigh wave, and we may project out the nonphysical discrete Rayleigh wave. RP HEDSTROM, GW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-321,LIVERMORE,CA 94550, 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1993 VL 48 IS 6 BP 4815 EP 4822 DI 10.1103/PhysRevE.48.4815 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400082 ER PT J AU SKORDOS, PA AF SKORDOS, PA TI INITIAL AND BOUNDARY-CONDITIONS FOR THE LATTICE BOLTZMANN METHOD SO PHYSICAL REVIEW E LA English DT Article ID EQUATION; FLUIDS AB An alternative approach of implementing initial and boundary conditions for the lattice Boltzmann method is presented. The basic idea is to calculate the lattice Boltzmann populations at a boundary node from the fluid variables that are specified at this node using the gradients of the fluid velocity. The numerical performance of the lattice Boltzmann method is tested on several problems with exact solutions and is also compared to an explicit finite-difference projection method. The discretization error of the lattice Boltzmann method decreases quadratically with finer resolution both in space and in time. The roundoff error of the lattice Boltzmann method creates problems unless double-precision arithmetic is used. C1 MIT,CAMBRIDGE,MA 02139. RP SKORDOS, PA (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,B258,LOS ALAMOS,NM 87545, USA. NR 21 TC 175 Z9 176 U1 2 U2 22 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 DEC PY 1993 VL 48 IS 6 BP 4823 EP 4842 DI 10.1103/PhysRevE.48.4823 PG 20 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400083 ER PT J AU KHARE, A COOPER, F AF KHARE, A COOPER, F TI ONE-PARAMETER FAMILY OF SOLITON-SOLUTIONS WITH COMPACT SUPPORT IN A CLASS OF GENERALIZED KORTEWEG-DE VRIES EQUATIONS SO PHYSICAL REVIEW E LA English DT Note AB We study the generalized Korteweg-de Vries (KdV) equations derivable from the Lagrangian L(l,p) = integral[1/2 phi(x) phi(t) - (phi x)(l)/l(l-1) + alpha(phi(x))(p)(phi(xx))(2)]dx, where the usual fields u(x, t) of the generaliaed KdV equation are defined by u(u, t) = phi(x)(x, t). For p an arbitrary continuous parameter 0 < p less than or equal to 2, l = p + 2 we find soliton solutions with compact support (compactons) to these equations which have the feature that their width is independent of the amplitude. This generalizes previous results which considered p = 1, 2. For the exact compactons we find a relation between the energy, mass, and velocity of the solitons. We show that this relationship can also be obtained using a variational method based on the principle ofIeast action. C1 SACHIVALAYA MARG,INST PHYS,BHUBANESWAR 751005,ORISSA,INDIA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP KHARE, A (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 2 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1993 VL 48 IS 6 BP 4843 EP 4844 DI 10.1103/PhysRevE.48.4843 PG 2 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MQ164 UT WOS:A1993MQ16400084 ER PT J AU SMITH, GR COOK, DR KAUFMAN, AN KRITZ, AH MCDONALD, SW AF SMITH, GR COOK, DR KAUFMAN, AN KRITZ, AH MCDONALD, SW TI SCATTERING OF ORDINARY-MODE ELECTROMAGNETIC-WAVES BY DENSITY-FLUCTUATIONS IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LOWER HYBRID WAVES; ANOMALOUS TRANSPORT; PROPAGATION; PLASMA AB Discussion and applications are presented for two approaches for estimating the effects of scattering of electromagnetic waves by turbulent density fluctuations in tokamaks. Ordinary-mode waves propagating nearly perpendicular to the equilibrium magnetic field are considered. The multiple-scattering approach provides analytic results for the angular and spatial spreading of a microwave beam by the turbulence. The single-scattering approach yields numerical results and is derived by a compact technique involving Wigner functions. Both approaches are applied to idealized tokamaks to clarify relationships between the approaches and to test limits of applicability of the multiple-scattering approach. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LEHIGH UNIV,BETHLEHEM,PA 18015. BERKELEY RES ASSOCIATES INC,BERKELEY,CA 94701. RP SMITH, GR (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 32 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1993 VL 5 IS 12 BP 4299 EP 4311 DI 10.1063/1.860547 PG 13 WC Physics, Fluids & Plasmas SC Physics GA MK541 UT WOS:A1993MK54100005 ER PT J AU CRAXTON, RS TURNER, FS HOEFEN, R DARROW, C GABL, EF BUSCH, GE AF CRAXTON, RS TURNER, FS HOEFEN, R DARROW, C GABL, EF BUSCH, GE TI CHARACTERIZATION OF LASER-PRODUCED PLASMA-DENSITY PROFILES USING GRID IMAGE REFRACTOMETRY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ELECTRON-DENSITY; REFRACTION MEASUREMENTS; RAMAN-SCATTERING; PHASE OBJECTS; INTERFEROMETRY; SCALE; DIAGNOSTICS; PROBE AB Grid image refractometry (GIR) is proposed as a technique for determining the two-dimensional density profiles of long scale-length laser-produced plasmas. Its distinctive feature is that an optical probe beam is broken up into ''rays'' by being passed through a grid before traversing the plasma. The refraction angles of the rays are measured by imaging the plasma at two or more object planes and are integrated to yield the phase front. For cylindrically symmetric plasmas the density profile is then determined using Abel inversion. The feasibility of GIR is illustrated by an experiment in which a thick CH target was irradiated with approximate to 100 J of 527 nm radiation and diagnosed with a 20 psec, 263 nm probe. The resulting density profile is substantially larger than any that have previously been reported using interferometry and compares quite closely with hydrodynamic simulations. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RUSH HENRIETTA HIGH SCH,HENRIETTA,NY 14467. WAYLAND CENT SCH,WAYLAND,NY 14572. KMS FUSION INC,ANN ARBOR,MI 48106. RP CRAXTON, RS (reprint author), UNIV ROCHESTER,LASER ENERGET LAB,250 E RIVER RD,ROCHESTER,NY 14623, USA. NR 46 TC 21 Z9 21 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1993 VL 5 IS 12 BP 4419 EP 4431 DI 10.1063/1.860558 PG 13 WC Physics, Fluids & Plasmas SC Physics GA MK541 UT WOS:A1993MK54100017 ER PT J AU POLLOCK, EL LONDON, RA AF POLLOCK, EL LONDON, RA TI ABSENCE OF DICKE NARROWING IN X-RAY LASER PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID STATISTICAL-MECHANICS AB Present x-ray laser plasmas are in the intermediate coupling regime (0.1 < Gamma < 4, Gamma = Z(2)e(2)/kTa, with a the ion sphere radius), where the binary collision based arguments of low density plasma kinetic theory can be misleading. The difficulty of modeling the spectral output from neonlike lasers at wavelengths near 200 Angstrom A has led to the suggestion, based on a low density, electron screened, plasma model, that collisional (''Dicke'') narrowing may be important. Molecular dynamics results, which include ion collisions and screening effects, are presented here. They indicate that the free-particle Doppler approximation is still quite accurate for lambda approximate to 200 Angstrom A and Gamma less than or similar to 1. Collisional narrowing will become important at somewhat stronger couplings (T approximate to 5) and at this wavelength the diffusion approximation is reasonable for T > 10. Collisional narrowing is found to be small even for the higher density (Gamma approximate to 4) nickel-like lasers operating near 45 Angstrom A. RP POLLOCK, EL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 18 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1993 VL 5 IS 12 BP 4495 EP 4498 DI 10.1063/1.860565 PG 4 WC Physics, Fluids & Plasmas SC Physics GA MK541 UT WOS:A1993MK54100024 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, JC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYBEN, O SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, JC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYBEN, O SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI RESULTS FROM THE L3 EXPERIMENT AT LEP SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID HADRONIC-Z-DECAYS; ELECTRON-POSITRON-ANNIHILATION; SQUARE-ROOT-S; FERMION PAIR PRODUCTION; NEUTRAL HEAVY-LEPTONS; LIGHT HIGGS BOSON; LUND MONTE-CARLO; CONSTANT ALPHA-S; B-MESON DECAYS; LEADING-LOGARITHMIC APPROXIMATION AB In this report we summarize the major results from the first three years of running of the L3 detector at the Large Electron Positron collider (LEP). The L3 detector was designed to measure electrons, photons and muons with high precision; it has achieved (DELTAE/E) almost-equal-to 1.4% for electrons and photons at E = 45 GeV and (DELTAp/p) almost-equal-to 2.5% for muons at p = 45 GeV. Most of the experimental results presented are based on approximately 500 000 Z events. The data provide four independent checks of the Standard Model weak neutral currents to an accuracy of almost-equal-to 1%. These are: the measurement of Z parameters; the measurement of the forward-backward charge asymmetry of lepton pairs; the measurement of asymmetry parameters from Z --> bbBAR decays; and the measurement of the tau lepton polarization asymmetry. The data also provide information on weak charged currents from measurements of b hadrons such as decay width, lifetime, and B0-B0BAR mixing, and from measurements Of tau leptons such as their lifetime and branching ratios. The large number of Z events and the resolution of the L3 detector allow precision tests of QED and QCD, including the production of pi0, eta and hard photons. Leptonic final states with hard isolated photons are analyzed and high mass photon pairs are observed. Higgs boson production has not been observed and limits are given in the context of the Standard Model and its supersymmetric extensions. We also present upper limits on rare Z decays such as Z --> gammagammagamma and on flavor violating decays such as Z --> etau, mutau. Finally, upper limits obtained in the search for various new particles and new interactions are reported. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. CNRS, IN2P3, LAPP, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, 100039 BEIJING, PEOPLES R CHINA. INFN, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. MIT, CAMBRIDGE, MA 02139 USA. 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, PEOPLES R CHINA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, IN2P3, CNRS, F-69622 VILLEURBANNE, FRANCE. CTR INVEST ENERGET MEDIOAMBIENTALES & TECHNOL, E-28040 MADRID, SPAIN. INFN, I-20133 MILAN, ITALY. MOSCOW INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92103 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, I-50125 FLORENCE, ITALY. RI 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; Berdugo, Javier/A-2858-2015; Ferguson, Thomas/O-3444-2014; Vogel, Helmut/N-8882-2014; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Arce, Pedro/L-1268-2014; Gonzalez Romero, Enrique/L-7561-2014 OI Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; Berdugo, Javier/0000-0002-7911-8532; Ferguson, Thomas/0000-0001-5822-3731; Vogel, Helmut/0000-0002-6109-3023; Filthaut, Frank/0000-0003-3338-2247; Leijtens, Xaveer/0000-0001-7794-8236; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Arce, Pedro/0000-0003-3009-0484; Gonzalez Romero, Enrique/0000-0003-2376-8920 NR 436 TC 268 Z9 268 U1 4 U2 40 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 EI 1873-6270 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD DEC PY 1993 VL 236 IS 1-2 BP 1 EP 146 PG 146 WC Physics, Multidisciplinary SC Physics GA MM258 UT WOS:A1993MM25800001 ER PT J AU HEDSTROM, G AF HEDSTROM, G TI COMPUTATIONAL PHYSICS TALKS - TELL TECHNIQUES SO PHYSICS TODAY LA English DT Letter RP HEDSTROM, G (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 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 DEC PY 1993 VL 46 IS 12 BP 68 EP 68 DI 10.1063/1.2809142 PG 1 WC Physics, Multidisciplinary SC Physics GA MT861 UT WOS:A1993MT86100019 ER PT J AU BAK, P PACZUSKI, M AF BAK, P PACZUSKI, M TI WHY NATURE IS COMPLEX SO PHYSICS WORLD LA English DT Article RP BAK, P (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 25 Z9 25 U1 1 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8585 J9 PHYS WORLD JI Phys. World PD DEC PY 1993 VL 6 IS 12 BP 39 EP 43 PG 5 WC Physics, Multidisciplinary SC Physics GA MN646 UT WOS:A1993MN64600028 ER PT J AU CONE, KC COCCIOLONE, SM BURR, FA BURR, B AF CONE, KC COCCIOLONE, SM BURR, FA BURR, B TI MAIZE ANTHOCYANIN REGULATORY GENE PL IS A DUPLICATE OF C1 THAT FUNCTIONS IN THE PLANT SO PLANT CELL LA English DT Article ID FRAGMENT LENGTH POLYMORPHISMS; NUCLEOTIDE-SEQUENCE; ZEA-MAYS; TRANSCRIPTIONAL ACTIVATORS; RECOMBINANT INBREDS; MOLECULAR ANALYSIS; B-ALLELES; CLONING; LOCUS; PROTEINS AB Genetic studies in maize have identified several regulatory genes that control the tissue-specific synthesis of purple anthocyanin pigments in the plant. c1 regulates pigmentation in the aleurone layer of the kernel, whereas pigmentation in the vegetative and floral tissues of the plant body depends on pl. c1 encodes a protein with the structural features of eukaryotic transcription factors and functions to control the accumulation of transcripts for the anthocyanin biosynthetic genes. Previous genetic and molecular observations have prompted the hypothesis that c1 and pl are functionally duplicate, in that they control the same set of anthocyanin structural genes but in distinct parts of the plant. Here, we show that this proposed functional similarity is reflected by DNA sequence homology between c1 and pl. Using a c1 DNA fragment as a hybridization probe, genomic and cDNA clones for pi were isolated. Comparison of pl and c1 cDNA sequences revealed that the genes encode proteins with 90% or more amino acid identity in the amino- and carboxyl-terminal domains that are known to be important for the regulatory function of the C1 protein. Consistent with the idea that the pl gene product also acts as a transcriptional activator is our finding that a functional pl allele is required for the transcription of at least three structural genes in the anthocyanin biosynthetic pathway. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP CONE, KC (reprint author), UNIV MISSOURI,DIV BIOL SCI,COLUMBIA,MO 65211, USA. NR 50 TC 192 Z9 211 U1 5 U2 16 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 1040-4651 J9 PLANT CELL JI Plant Cell PD DEC PY 1993 VL 5 IS 12 BP 1795 EP 1805 PG 11 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA MQ486 UT WOS:A1993MQ48600010 PM 8305872 ER PT J AU SULLIVAN, ML GREEN, PJ AF SULLIVAN, ML GREEN, PJ TI POSTTRANSCRIPTIONAL REGULATION OF NUCLEAR-ENCODED GENES IN HIGHER-PLANTS - THE ROLES OF MESSENGER-RNA STABILITY AND TRANSLATION SO PLANT MOLECULAR BIOLOGY LA English DT Review DE GENE REGULATION; MESSENGER RNA DECAY; NONSENSE-MEDIATED MESSENGER RNA DECAY; TRANSLATIONAL CONTROL ID CAULIFLOWER MOSAIC-VIRUS; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; ARABIDOPSIS-THALIANA; SMALL SUBUNIT; TRANSGENIC TOBACCO; INITIATION-FACTOR; EXPRESSION; PROTEIN; CELLS; DEGRADATION C1 MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. NR 85 TC 83 Z9 86 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD DEC PY 1993 VL 23 IS 6 BP 1091 EP 1104 DI 10.1007/BF00042344 PG 14 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA MR878 UT WOS:A1993MR87800001 PM 8292775 ER PT J AU ARCHER, EK KEEGSTRA, K AF ARCHER, EK KEEGSTRA, K TI ANALYSIS OF CHLOROPLAST TRANSIT PEPTIDE FUNCTION USING MUTATIONS IN THE CARBOXYL-TERMINAL REGION SO PLANT MOLECULAR BIOLOGY LA English DT Article DE CHLOROPLAST; PROTEIN IMPORT; TRANSIT PEPTIDE; SECONDARY STRUCTURE ID OUTER ENVELOPE MEMBRANE; AMINO-ACID-SEQUENCE; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; SMALL SUBUNIT; PROTEINS; PRECURSOR; CLEAVAGE; BINDING; TRANSLOCATION; TRANSPORT AB Protein import into chloroplasts requires a transit peptide, which interacts with the chloroplast transport apparatus and leads to translocation of the protein across the chloroplast envelope. While the amino acid sequences of many transit peptides are known, functional domains have been difficult to identify. Previous studies suggest that the carboxyl terminus of the transit peptide for ribulose bisphosphate carboxylase small subunit is important for both translocation across the chloroplast envelope and proper processing of the precursor protein. We dissected this region using in vitro mutagenesis, creating a set of mutants with small changes in primary structure predicted to cause alterations in secondary structure. The import behavior of the mutant proteins was assessed using isolated chloroplasts. Our results show that removal of a conserved arginine residue in this region results in impaired processing, but does not necessarily affect import rates. In contrast, substituting amino acids with low reverse turn or amphiphilic potential for other original residues affected import rate but not processing. C1 MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. RP ARCHER, EK (reprint author), TRINITY COLL,DEPT BIOL,HARTFORD,CT 06106, USA. NR 22 TC 27 Z9 27 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD DEC PY 1993 VL 23 IS 6 BP 1105 EP 1115 DI 10.1007/BF00042345 PG 11 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA MR878 UT WOS:A1993MR87800002 PM 8292776 ER PT J AU FINCKE, JR SWANK, WD HAGGARD, DC AF FINCKE, JR SWANK, WD HAGGARD, DC TI PLASMA SPRAYING OF ALUMINA - PLASMA AND PARTICLE FLOW-FIELDS SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE PLASMA SPRAYING; ALUMINA; PLASMA JET AND PARTICLE DIAGNOSTICS ID PROBE MEASUREMENTS; JETS; TEMPERATURE; VELOCITY; SIZE AB A comprehensive experimental examination of the interaction between a subsonic thermal plasma jet and injected alumina particles is presented. Measurements of plasma velocity, temperature, and entrained air were obtained from an enthalpy probe and mass spectrometer combination. A diffusive separation, or demixing, of the Ar and He plasma gas was observed Centerline plasma velocities and temperatures ranged from 150-1500 m/s and 2000 to 14,000 K, respectfully, in the region between the torch and a typical substrate location of 90 mm. Measurements of particle size, velocity, temperature, and local number density were obtained from a combination laser particle sizing system, Laser doppler velocimeter (LDV), and two-color pyrometer. Centerline temperatures and velocities for the nominally 30 mu m particles used weve 2400-2800 K and 150-200 m/s, respectively. RP FINCKE, JR (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 45 TC 30 Z9 31 U1 1 U2 3 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 DEC PY 1993 VL 13 IS 4 BP 579 EP 600 DI 10.1007/BF01570132 PG 22 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA MT856 UT WOS:A1993MT85600001 ER PT J AU NUHRENBERG, J MERKEL, P SCHWAB, C SCHWENN, U COOPER, A HAYASHI, T HIRSHMAN, SP JOHNSON, JL MONTICELLO, DA REIMAN, AH AF NUHRENBERG, J MERKEL, P SCHWAB, C SCHWENN, U COOPER, A HAYASHI, T HIRSHMAN, SP JOHNSON, JL MONTICELLO, DA REIMAN, AH TI MHD-THEORETICAL ASPECTS OF STELLARATORS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID MAGNETIC SURFACE BREAKING; HELIOTRON TORSATRON; EQUILIBRIA; BETA AB Development and results of the MHD description of stellarators over the past half-decade are reviewed. Major events were the acceleration of convergence of those equilibrium codes which assume nested surfaces, the advent of equilibrium codes which do not a priori assume nested surfaces, and the advent of stability codes for nonlocal modes. Major results having these developments as prerequisites were that stellarators can definitely be optimized, can have nicely nested surfaces at finite beta at least in a limited sense, and can be completely ideal-MHD stable at elevated beta values. C1 CTR RECH PHYS PLASMA, EURATOM ASSOCIAT, LAUSANNE, SWITZERLAND. NATL INST FUS SCI, NAGOYA, JAPAN. OAK RIDGE NATL LAB, OAK RIDGE, TN USA. PRINCETON PLASMA PHYS LAB, PRINCETON, NJ USA. RP NUHRENBERG, J (reprint author), MAX PLANCK INST PLASMA PHYS, EURATOM ASSOCIAT, W-8046 GARCHING, GERMANY. NR 26 TC 6 Z9 6 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 EI 1361-6587 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1993 VL 35 SU B BP B115 EP B128 DI 10.1088/0741-3335/35/SB/009 PG 14 WC Physics, Fluids & Plasmas SC Physics GA MN566 UT WOS:A1993MN56600010 ER PT J AU RAX, JM FISCH, NJ LAURENT, L AF RAX, JM FISCH, NJ LAURENT, L TI FAST PARTICLE RESONANCES IN TOKAMAKS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 20th European Conference on Controlled Fusion and Plasma Physics CY JUL 26-30, 1993 CL LISBON, PORTUGAL SP EUROPEAN PHYS SOC, PLASMA PHYS DIV ID LOWER HYBRID WAVES; ENERGETIC ALPHA-PARTICLES; RUNAWAY ELECTRONS; STOCHASTIC-INSTABILITY; CURRENT DRIVE; ABSORPTION AB Most of the recent studies on fast particles deal with the stabilization-destabilization of magnetohydrodynamics modes. Here we present another aspect of fast particle resonances in to tokamaks and review some recent results on the dynamics of energetic electrons and alpha particles. The interaction between the runaway population and the magnetic ripple is analyzed. The occurrence of an induced radiative slowing down is demonstrated and its potential is assessed. Then, the resonant channeling of alpha particle free energy, to either fast electrons or fast ions, by means of lower hybrid waves, is investigated, and the efficiency of this process is analyzed. C1 PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08540 USA. CEN CADARACHE, DRFC, SERV PHYS PLASMAS FUS, F-13108 ST PAUL LES DURANCE, FRANCE. RP RAX, JM (reprint author), CENS, DRECAM, SERV PHOTONS ATOMES & MOLEC, BAT 522, F-91190 GIF SUR YVETTE, FRANCE. OI LAURENT, LOUIS/0000-0001-6158-8790 NR 27 TC 5 Z9 5 U1 0 U2 1 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 DEC PY 1993 VL 35 SU B BP B129 EP B140 DI 10.1088/0741-3335/35/SB/010 PG 12 WC Physics, Fluids & Plasmas SC Physics GA MN566 UT WOS:A1993MN56600011 ER PT J AU DINI, J AF DINI, J TI AIPP IS AN ENVIRONMENTAL LEADER - EXPEDITING POLLUTION PREVENTION CONCEPTS IS ITS MISSION SO PLATING AND SURFACE FINISHING LA English DT Article AB From time to time, P&SF will spotlight AESF's sister societies so our members can become more familiar with their concepts and activities, and how they interact with AESF. Featured first is the American Institute for Pollution Prevention (AIPP). With members from 26 professional societies and trade associations, AIPP serves as an environmental leader for industry and government. RP DINI, J (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV MAT FABRICAT,LIVERMORE,CA 94550, 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 DEC PY 1993 VL 80 IS 12 BP 88 EP 89 PG 2 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA ML409 UT WOS:A1993ML40900015 ER PT J AU CARNES, BA OLSHANSKY, SJ AF CARNES, BA OLSHANSKY, SJ TI EVOLUTIONARY PERSPECTIVES ON HUMAN SENESCENCE SO POPULATION AND DEVELOPMENT REVIEW LA English DT Note ID LONGITUDINAL GOMPERTZIAN ANALYSIS; UNITED-STATES; LIFE EXPECTANCY; LONGER LIFE; MORTALITY; HEALTH; DYNAMICS AB Species have evolved adaptive strategies for ensuring reproductive success. Reproduction concentrated early in life suggests that extreme mortality at young ages has been a common demographic characteristic among all forms of life. Because it operates through the differential reproductive success of individuals, natural selection, the arbiter of evolution, is not effective after the reproductive period ends. Requiring survival beyond the reproductive period for senescence to be expressed suggests that senescence is not genetically programmed, but neither is there an active program for immortality. What we call senescence may simply bc the inadvertent consequence of surviving beyond reproductive period. As survival is further extended, inevitable declines in physiological function and a proliferation of fatal and nonfatal degenerative diseases that become progressively less amenable to modification would be predicted. This model of senescence can provide a theoretical framework for demographers in their development or evaluation of models of human mortality. C1 UNIV CHICAGO,CTR AGING HLTH & SOC,CHICAGO,IL 60637. UNIV CHICAGO,DEPT MED,CHICAGO,IL 60637. UNIV CHICAGO,POPULAT RES CTR,CHICAGO,IL 60637. RP CARNES, BA (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439, USA. NR 45 TC 45 Z9 45 U1 0 U2 4 PU POPULATION COUNCIL PI NEW YORK PA ONE DAG HAMMARSKJOLD PLAZA, NEW YORK, NY 10017 SN 0098-7921 J9 POPUL DEV REV JI Popul. Dev. Rev. PD DEC PY 1993 VL 19 IS 4 BP 793 EP 806 DI 10.2307/2938414 PG 14 WC Demography; Sociology SC Demography; Sociology GA MY498 UT WOS:A1993MY49800005 ER PT J AU DING, JM LYCZKOWSKI, RW SHA, WT ALTOBELLI, SA FUKUSHIMA, E AF DING, JM LYCZKOWSKI, RW SHA, WT ALTOBELLI, SA FUKUSHIMA, E TI NUMERICAL-ANALYSIS OF LIQUID-SOLIDS SUSPENSION VELOCITIES AND CONCENTRATIONS OBTAINED BY NMR IMAGING SO POWDER TECHNOLOGY LA English DT Article ID PARTICLE CLUSTERS; FLUIDIZED-BED; FLOW AB Analyses of some of the steady-state, fully developed, and isothermal carrier fluid velocity and solids concentration data of Altobelli et al. [1] and Sinton and Chow [2] obtained using three-dimensional time-of-flight nuclear magnetic (NMR) imaging techniques are presented in this paper. NMR imaging offers powerful techniques to nonintrusively determine three-dimensional time-dependent velocity and concentration fields to assist development and validation of the constitutive models and the computer programs describing concentrated suspensions. These experiments were carefully performed and probably represent the best available open literature data of their kind. COMMIX-M, a three-dimensional transient and steady-state computer program written in Cartesian and cylindrical coordinates, has been used to analyze the NMR data. This computer program is capable of analyzing multiphase flow and heat transfer and utilizes the separate phases model wherein each phase has its own mass, momentum, and energy equations. COMMIX-M contains constitutive relationships for interfacial drag, solids viscosities and stresses to describe the solids theology, and virtual mass and shear lift forces extended to a continuum from the single particle literature. Also included is a solids partial-slip boundary condition to allow nonzero tangential velocity at the tube walls. This computer program is being developed at Argonne National Laboratory for application to test various interphase interaction models and to predict design and processing of dense fluid-solids suspension systems. Comparisons of computed and measured concentration and velocity profiles provide some insights into the mechanisms governing the observed phenomena. Recommendations for model improvement are given. To the authors'knowledge, these are the first such comparisons of theory and experiment. C1 ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. LOVELACE FDN MED EDUC & RES,ALBUQUERQUE,NM 87108. OI Fukushima, Eiichi/0000-0003-1670-5884 NR 30 TC 26 Z9 26 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD DEC PY 1993 VL 77 IS 3 BP 301 EP 312 DI 10.1016/0032-5910(93)85022-2 PG 12 WC Engineering, Chemical SC Engineering GA MM839 UT WOS:A1993MM83900008 ER PT J AU KLARA, JM AF KLARA, JM TI HIPPS - BEYOND STATE-OF-THE-ART .1. SO POWER ENGINEERING LA English DT Article RP KLARA, JM (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,OFF FOSSIL ENERGY,PITTSBURGH,PA 15236, USA. NR 0 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 0032-5961 J9 POWER ENG JI Power Eng. PD DEC PY 1993 VL 97 IS 12 BP 37 EP 39 PG 3 WC Energy & Fuels; Engineering, Multidisciplinary SC Energy & Fuels; Engineering GA MN534 UT WOS:A1993MN53400009 ER PT J AU RAJA, R AF RAJA, R TI RECENT RESULTS FROM THE D0 DETECTOR SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article; Proceedings Paper CT 10th DAE Symposium on High Energy Physics CY DEC, 1992 CL BOMBAY, INDIA ID PROTON-ANTIPROTON COLLISIONS; TOP-QUARK; HEAVY QUARKS; HADRONIC COLLISIONS; SEARCH; TEV; ELECTRON+JETS; EVENTS AB The D Theta Experiment started taking data in August 1992. We present preliminary results on inclusive jet production, direct photon production, W/Z production and decays, b Physics and first searches for t $$($) over bar t production and new particles beyond the Standard Model. RP RAJA, R (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD DEC PY 1993 VL 41 SU S BP 197 EP 216 DI 10.1007/BF02908084 PG 20 WC Physics, Multidisciplinary SC Physics GA MU456 UT WOS:A1993MU45600013 ER PT J AU ROY, DP SARKAR, U RAJA, R AF ROY, DP SARKAR, U RAJA, R TI R-PARITY VIOLATING SUSY MODEL SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article; Proceedings Paper CT 10th DAE Symposium on High Energy Physics CY DEC, 1992 CL BOMBAY, INDIA ID STANDARD MODEL; SUPERSYMMETRIC MODELS; HADRON COLLIDERS; MASS LIMITS; BARYON; CONSTRAINTS; NEUTRALINO; PARTICLES; SEARCHES; PHYSICS AB This is a phenomenological review of R parity violating SUSY models, with particular emphasis on explicit R parity violation. C1 PHYS RES LAB,AHMEDABAD,GUJARAT,INDIA. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP ROY, DP (reprint author), TATA INST FUNDAMENTAL RES,BOMBAY 400005,MAHARASHTRA,INDIA. NR 32 TC 6 Z9 6 U1 0 U2 0 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD DEC PY 1993 VL 41 SU S BP 333 EP 346 DI 10.1007/BF02908093 PG 14 WC Physics, Multidisciplinary SC Physics GA MU456 UT WOS:A1993MU45600022 ER PT J AU DAS, BP RAJA, R AF DAS, BP RAJA, R TI ELECTRIC-DIPOLE MOMENT OF ATOMS DUE TO PARITY AND TIME-REVERSAL VIOLATION AND ITS IMPLICATIONS FOR PHYSICS BEYOND THE STANDARD MODEL SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article; Proceedings Paper CT 10th DAE Symposium on High Energy Physics CY DEC, 1992 CL BOMBAY, INDIA ID NUCLEON INTERACTIONS; T-ODD C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP DAS, BP (reprint author), INDIAN INST TECHNOL,BOMBAY 400076,MAHARASHTRA,INDIA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD DEC PY 1993 VL 41 SU S BP 413 EP 416 DI 10.1007/BF02908098 PG 4 WC Physics, Multidisciplinary SC Physics GA MU456 UT WOS:A1993MU45600027 ER PT J AU GREENBAUM, E AF GREENBAUM, E TI PHOTOBIOTECHNOLOGY - APPLICATION OF PHOTOSYNTHESIS TO THE PRODUCTION OF RENEWABLE FUELS AND CHEMICALS SO PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES LA English DT Article; Proceedings Paper CT 2nd International Conference on Solar Energy Storage and Applied Photochemistry CY JAN 06-11, 1993 CL AIN SHAMS UNIV, CAIRO, EGYPT HO AIN SHAMS UNIV DE PHOTOBIOTECHNOLOGY; PHOTOSYNTHESIS; HYDROGEN; OXYGEN; PLATINIZED CHLOROPLASTS; WATER SPLITTING ID PLATINIZED CHLOROPLASTS; MEMBRANE; WATER; CHLAMYDOMONAS; BIOPHOTOLYSIS; ELECTRODES; LIGHT AB Sustained hydrogen photoevolution from Chlamydomonas reinhardtii and C. moewusii was measured under an anoxic, CO2-containing atmosphere. It has been discovered that light intensity and temperature influence the partitioning of reductant between the hydrogen photoevolution pathway and the Calvin cycle. Under low incident light intensity (1-3 W m-2) or low temperature (almost-equal-to 0-degrees-C), the flow of photosynthetic reductant to the Calvin cycle was reduced, and reductant was partitioned to the hydrogen pathway as evidenced by sustained H-2 photoevolution. Under saturating light (25 W m-2) and moderate temperature (20 +/- 5-degrees-C), the Calvin cycle became the absolute sink for reductant with the exception of a burst of H2 occurring at light on. A novel photobiophysical phenomenon was observed in isolated spinach chloroplasts that were metalized by precipitating colloidal platinum onto the surface of the thylakoid membranes. A two-point irradiation and detection system was constructed in which a continuous beam helium-neon laser (lambda = 632.8 nm) was used to irradiate the platinized chloroplasts at varying perpendicular distances from a single linear platinum electrode in pressure contact with the platinized chloroplasts. No external voltage bias was applied to the system. The key objective of the experiments reported in this report was to measure the relative photoconductivity of the chloroplast-metal composite matrix. RP GREENBAUM, E (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 38 TC 0 Z9 0 U1 0 U2 2 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0253-4134 J9 P INDIAN AS-CHEM SCI JI Proc. Indian Acad. Sci.-Chem. Sci. PD DEC PY 1993 VL 105 IS 6 BP 333 EP 342 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA NJ591 UT WOS:A1993NJ59100003 ER PT J AU LEE, HI GAL, S NEWMAN, TC RAIKHEL, NV AF LEE, HI GAL, S NEWMAN, TC RAIKHEL, NV TI THE ARABIDOPSIS ENDOPLASMIC-RETICULUM RETENTION RECEPTOR FUNCTIONS IN YEAST SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE KDEL RECEPTOR; ERD2 GENE; YEAST COMPLEMENTATION; ARABIDOPSIS CDNA LIBRARY ID LUMINAL ER PROTEINS; HUMAN KDEL RECEPTOR; NUCLEOTIDE-SEQUENCE; HDEL RECEPTOR; GENE; PLANT; EXPRESSION; CELLS; CDNA; COMPARTMENT AB Soluble proteins retained in the lumen of the endoplasmic reticulum (ER) contain a carboxyl-terminal tetrapeptide sequence that functions presumably to recycle these proteins from a subsequent compartment. Biochemical and genetic evidence indicate that the ERD2 gene product is the receptor for these ER retention signals. Here we report the identification of a cDNA clone from Arabidopsis thaliana (aERD2) similar in sequence and size to members of the ERD2 gene family. Southern and Northern blot analyses indicate that Arabidopsis contains a single aERD2 gene which is expressed at different levels in various plant tissues. A functional assay demonstrates that the Arabidopsis homologue, unlike the mammalian protein, can complement the lethal phenotype of the erd2 deletion mutant of Saccharomyces cerevisiae, indicating that this protein may have a similar function in plants. As the plant protein may have a binding specificity similar to the human Erd2 protein but can function in yeast, we suggest that the plant homologue is the functional link between yeast and animals. C1 MICHIGAN STATE UNIV, US DOE, PLANT RES LAB, E LANSING, MI 48824 USA. NR 51 TC 93 Z9 95 U1 0 U2 3 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD DEC 1 PY 1993 VL 90 IS 23 BP 11433 EP 11437 DI 10.1073/pnas.90.23.11433 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MK094 UT WOS:A1993MK09400113 PM 8248265 ER PT J AU CASEY, C ESPARZA, V GRADEN, CJ REEP, PJ AF CASEY, C ESPARZA, V GRADEN, CJ REEP, PJ TI SYSTEMATIC PLANNING FOR DATA-COLLECTION SO QUALITY PROGRESS LA English DT Article RP CASEY, C (reprint author), EG&G IDAHO INC,IDAHO NATL LAB,IDAHO FALLS,ID 83401, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU AMER SOC QUALITY CONTROL-ASQC PI MILWAUKEE PA ASQC MEMBERSHIP MANAGER 611 E. WISCONSIN AVENUE, MILWAUKEE, WI 53202 SN 0033-524X J9 QUAL PROG JI Qual. Prog. PD DEC PY 1993 VL 26 IS 12 BP 55 EP 59 PG 5 WC Engineering, Multidisciplinary; Engineering, Industrial; Management; Operations Research & Management Science SC Engineering; Business & Economics; Operations Research & Management Science GA ML075 UT WOS:A1993ML07500016 ER PT J AU BURROWS, DR AF BURROWS, DR TI QUALITY ASSURANCE INVADES THE SWAMP SO QUALITY PROGRESS LA English DT Article RP BURROWS, DR (reprint author), SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC QUALITY CONTROL-ASQC PI MILWAUKEE PA ASQC MEMBERSHIP MANAGER 611 E. WISCONSIN AVENUE, MILWAUKEE, WI 53202 SN 0033-524X J9 QUAL PROG JI Qual. Prog. PD DEC PY 1993 VL 26 IS 12 BP 105 EP 107 PG 3 WC Engineering, Multidisciplinary; Engineering, Industrial; Management; Operations Research & Management Science SC Engineering; Business & Economics; Operations Research & Management Science GA ML075 UT WOS:A1993ML07500025 ER PT J AU SPEIDEL, MT HOLMQUIST, B KASSIS, AI HUMM, JL BERMAN, RM ATCHER, RW HINES, JJ MACKLIS, RM AF SPEIDEL, MT HOLMQUIST, B KASSIS, AI HUMM, JL BERMAN, RM ATCHER, RW HINES, JJ MACKLIS, RM TI MORPHOLOGICAL, BIOCHEMICAL, AND MOLECULAR-CHANGES IN ENDOTHELIAL-CELLS AFTER ALPHA-PARTICLE IRRADIATION SO RADIATION RESEARCH LA English DT Article ID ANGIOTENSIN CONVERTING ENZYME; NEUTRAL FILTER ELUTION; DOUBLE-STRAND BREAKS; RADIOIMMUNOTHERAPY; RADIATION; DOSIMETRY; ANTIBODIES; INVITRO; REPAIR; AORTA C1 BRIGHAM & WOMENS HOSP,DEPT BIOL CHEM & MOLEC PHARMACOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,DEPT RADIOL,BOSTON,MA 02115. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV BIOL,ARGONNE,IL 60439. RP SPEIDEL, MT (reprint author), BRIGHAM & WOMENS HOSP,JOINT CTR RADIAT THERAPY,BOSTON,MA 02115, USA. OI Atcher, Robert/0000-0003-4656-2247 FU NCI NIH HHS [R01CA 50886, R29 CA 49017, R01 CA 15523] NR 30 TC 9 Z9 9 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 DEC PY 1993 VL 136 IS 3 BP 373 EP 381 DI 10.2307/3578550 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA MQ741 UT WOS:A1993MQ74100010 PM 8278579 ER PT J AU ALPEN, EL POWERSRISIUS, P CURTIS, SB DEGUZMAN, R AF ALPEN, EL POWERSRISIUS, P CURTIS, SB DEGUZMAN, R TI TUMORIGENIC POTENTIAL OF HIGH-Z, HIGH-LET CHARGED-PARTICLE RADIATIONS SO RADIATION RESEARCH LA English DT Article ID FISSION-SPECTRUM NEUTRONS; HEAVY-ION RADIOBIOLOGY; MICE; INSTRUMENTATION; INACTIVATION; INDUCTION; CELLS; RAYS RP ALPEN, EL (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 30 TC 92 Z9 92 U1 1 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 DEC PY 1993 VL 136 IS 3 BP 382 EP 391 DI 10.2307/3578551 PG 10 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA MQ741 UT WOS:A1993MQ74100011 PM 8278580 ER PT J AU GILBERT, ES CRAGLE, DL WIGGS, LD AF GILBERT, ES CRAGLE, DL WIGGS, LD TI UPDATED ANALYSES OF COMBINED MORTALITY DATA FOR WORKERS AT THE HANFORD SITE, OAK-RIDGE-NATIONAL-LABORATORY, AND ROCKY FLATS WEAPONS PLANT SO RADIATION RESEARCH LA English DT Article ID OCCUPATIONAL EXPOSURE; RADIATION-WORKERS; EMPLOYEES; COHORT; TIME C1 OAK RIDGE INST SCI & EDUC, CTR EPIDEMIOL RES, OAK RIDGE, TN 37831 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM USA. RP GILBERT, ES (reprint author), PACIFIC NW LAB, DEPT EPIDEMIOL & BIOMETRY, RICHLAND, WA 99352 USA. NR 33 TC 91 Z9 95 U1 0 U2 3 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 DEC PY 1993 VL 136 IS 3 BP 408 EP 421 DI 10.2307/3578555 PG 14 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA MQ741 UT WOS:A1993MQ74100015 PM 8278584 ER PT J AU JONES, DW ONEILL, RV AF JONES, DW ONEILL, RV TI LAND-USE, NORTH-SOUTH TRADE, DEFORESTATION, AND ATMOSPHERIC CARBON INTERACTIONS SO RESOURCE AND ENERGY ECONOMICS LA English DT Article DE AGRICULTURE; CARBON DIOXIDE; DEFORESTATION; LAND USE; TRADE ID RESPONSES; DIOXIDE AB This paper develops a simple model of atmospheric carbon interactions between agricultural and industrial regions, with a focus on the consequences for land use and land clearance in the agricultural regions. We assume a single industrial region that produces only a manufactured good and a single agricultural region that produces a homogeneous agricultural good. The two regions trade, and the relative price of the agricultural and manufactured goods is determined by supply and demand. Production of the manufactured good releases carbon, which increases agricultural productivity; land clearance in the agricultural region also releases carbon but reduces precipitation as well, which retards plant productivity. We study the effects of land clearance in the agricultural region of the following changes: populations in each region, agricultural transportation costs, land clearance costs, costs of retarding carbon releases, and strength of relationship between atmospheric carbon concentration and plant productivity. As long as a higher atmospheric carbon concentration increases plant productivity, greater carbon releases per unit of manufactured good will expand the supply of the agricultural good, reduce its price relative to that of the manufactured good, reduce the wage in agriculture, and increase the land brought into agricultural production, thus exacerbating deforestation. A reduction in the cost of retarding carbon emissions would have the opposite set of effects but can alter the distribution of income away from the industrial region and toward the agricultural region. Population increases in the industrial region increase land clearance in the agricultural region, but population increases in the agricultural region reduce the area under cultivation. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP JONES, DW (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,BLDG 4500N,MS-6205,PO BOX 2008,OAK RIDGE,TN 37831, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0928-7655 J9 RESOUR ENERGY ECON JI Resour. Energy Econ. PD DEC PY 1993 VL 15 IS 4 BP 353 EP 370 PG 18 WC Economics; Energy & Fuels; Environmental Sciences; Environmental Studies SC Business & Economics; Energy & Fuels; Environmental Sciences & Ecology GA MR664 UT WOS:A1993MR66400002 ER PT J AU HU, TA CHAPPELL, EL MUNLEY, JT SHARPE, SW AF HU, TA CHAPPELL, EL MUNLEY, JT SHARPE, SW TI IMPROVED MULTIPASS OPTICS FOR DIODE-LASER SPECTROSCOPY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INFRARED-ABSORPTION; MOLECULAR-BEAM; COMPLEXES AB Feedback between optical elements can be a major source of noise when trying to attain high sensitivity in infrared absorption experiments. We find that a conventional White-cell optical arrangement introduces etaloning fringes that modulate the peak-to-peak amplitude of our signals by 1 part in 16 666, a fractional change of 6 X 10(-5). Although relatively small, this ''noise'' is systematic and adds coherently with averaging, obscuring interesting absorption features. An easily constructed multipass optical system suited for performing high-resolution infrared spectroscopy in molecular beams is described. The design is based on a variation of the White cell and has been optimized for use with lead salt diode lasers. One of the key components in the improved design is the addition of an oscillating mirror for spoiling optical feedback generated by laser scatter and/or poor mode coupling of the laser to the multipass optics. RP HU, TA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 17 TC 18 Z9 18 U1 2 U2 3 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 DEC PY 1993 VL 64 IS 12 BP 3380 EP 3383 DI 10.1063/1.1144308 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MM177 UT WOS:A1993MM17700003 ER PT J AU STEINKAMP, JA YOSHIDA, TM MARTIN, JC AF STEINKAMP, JA YOSHIDA, TM MARTIN, JC TI FLOW CYTOMETER FOR RESOLVING SIGNALS FROM HETEROGENEOUS FLUORESCENCE EMISSIONS AND QUANTIFYING LIFETIME IN FLUOROCHROME-LABELED CELLS PARTICLES BY PHASE-SENSITIVE DETECTION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID MODULATION FLUOROMETRY; LASER DIODE; FREQUENCY; RESOLUTION; SPECTRA; PROTEIN AB A phase-sensitive flow cytometer has been developed that combines flow cytometry and fluorescence lifetime spectroscopy measurement principles to provide unique capabilities for making phase-resolved measurements on fluorochrome-labeled cells and particles. Stained cells are analyzed as they intersect a high-frequency intensity-modulated (sinusoid) laser excitation beam. Fluorescence is measured orthogonally using only a single-channel optical detector. The detector output signals, which are phase shifted from a reference signal and amplitude demodulated, are processed by phase-sensitive detection electronics to resolve signals from heterogeneous fluorescence emissions and quantify single-component decay times. Results show signal phase shift and amplitude demodulation on fluorospheres; a detection limit threshold of 300-500 fluorescein molecules equivalence for excitation frequencies 1-30 MHz; a measurement precision (coefficient of variation) of 1.8% on alignment fluorospheres and 3.6% on cells stained for DNA content; the resolution of fluorescence signals from cells stained in combination with two fluorochromes, based on differences in their decay times; and the measurement of fluorescence lifetimes directly by the two-phase ratio method. RP STEINKAMP, JA (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 35 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1993 VL 64 IS 12 BP 3440 EP 3450 DI 10.1063/1.1144265 PG 11 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MM177 UT WOS:A1993MM17700010 ER PT J AU AUMAYR, F KURZ, H WINTER, HP SCHNEIDER, D BRIERE, MA MCDONALD, JW AF AUMAYR, F KURZ, H WINTER, HP SCHNEIDER, D BRIERE, MA MCDONALD, JW TI DISTINCTION BETWEEN MULTICHARGED ION SPECIES WITH EQUAL Q/M SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID CLEAN METAL-SURFACE; INDUCED ELECTRON-EMISSION; HIGHLY CHARGED IONS; HOLLOW ATOMS; STATISTICS AB We present a new technique for selective, highly sensitive, absolute detection of different multiply charged ion species with equal charge-to-mass ratios in mixed multicharged ion beams. This is achieved by exploiting the statistics of potential electron emission as induced by the ion beams on a clean metal surface. The applicability of the method is illustrated by way of different practical examples. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP AUMAYR, F (reprint author), VIENNA TECH UNIV, INST ALLGEMEINE PHYS, WIEDNER HAUPTSTR 8-10, A-1040 VIENNA, AUSTRIA. RI Aumayr, Friedrich/A-3920-2009 OI Aumayr, Friedrich/0000-0002-9788-0934 NR 41 TC 10 Z9 10 U1 0 U2 2 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 DEC PY 1993 VL 64 IS 12 BP 3499 EP 3502 DI 10.1063/1.1144274 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MM177 UT WOS:A1993MM17700020 ER PT J AU FINCKE, JR SWANK, WD SNYDER, SC HAGGARD, DC AF FINCKE, JR SWANK, WD SNYDER, SC HAGGARD, DC TI ENTHALPY PROBE PERFORMANCE IN COMPRESSIBLE THERMAL PLASMA JETS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Enthalpy probe measurements in compressible argon/helium thermal plasma jets are compared with results from high spectral resolution laser light scattering. In the laser scattering measurement the plasma temperature and velocity are determined directly from high-resolution line-shape analysis of light scattered by the plasma. The technique yields an unambiguous determination of gas or kinetic temperature without the assumption of local thermodynamic equilibrium. Velocity is determined directly from the measured Doppler shift. The enthalpy probe is a combination stagnation probe and flowing calorimeter. Gas temperatures and velocities are calculated from measured values using both frozen flow and equilibrium flow assumptions for the stagnation process. Over the Mach number range examined, the assumption of isentropic, frozen composition stagnation best matches the laser results. In the jet periphery a significant streamline displacement is caused by the presence of the probe. The displacement, which is a function of the nondimensional radial velocity gradient, distorts the velocity and temperature results in the wings of the profiles. In the core of the jets examined, probe measurements in both subsonic and supersonic compressible flows show excellent agreement with laser scattering results. RP FINCKE, JR (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 23 TC 24 Z9 25 U1 0 U2 2 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 DEC PY 1993 VL 64 IS 12 BP 3585 EP 3593 DI 10.1063/1.1144285 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MM177 UT WOS:A1993MM17700032 ER PT J AU WHITE, RK AF WHITE, RK TI ELECTRICAL AND INSTRUMENTATION SAFETY FOR CHEMICAL PROCESSES - BUSCHART,RJ SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,RISK ANAL SECT,OAK RIDGE,TN 37831, 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 DEC PY 1993 VL 13 IS 6 BP 685 EP 685 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 MN631 UT WOS:A1993MN63100010 ER PT J AU BREEDING, VP AF BREEDING, VP TI PREVENTION AND CONTROL OF ACCIDENTAL RELEASES OF HAZARDOUS GASES - FTHENAKIS,VM SO RISK ANALYSIS LA English DT Book Review C1 OAK RIDGE NATL LAB,CTR RISK MANAGEMENT,OAK RIDGE,TN. RP BREEDING, VP (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 DEC PY 1993 VL 13 IS 6 BP 687 EP 688 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA MN631 UT WOS:A1993MN63100018 ER PT J AU SASAKI, T RAPPE, AM LOUIE, SG AF SASAKI, T RAPPE, AM LOUIE, SG TI APPLICATION OF THE SOFT-CORE TYPE PSEUDOPOTENTIAL TO MAGNETIC SYSTEMS SO SCIENCE REPORTS OF THE RESEARCH INSTITUTES TOHOKU UNIVERSITY SERIES A-PHYSICS CHEMISTRY AND METALLURGY LA English DT Article DE PSEUDOPOTENTIAL; MAGNETIC SYSTEM; DENSITY-FUNCTIONAL THEORY; COHESIVE PROPERTIES ID IRON AB Structural and magnetic properties of ferromagnetic iron are computed using a plane-wave basis set and optimized pseudopotentials to study the effectiveness of these methods for magnetic systems. Although the pseudowave functions deviate significantly from the all-electron wave functions, the calculated properties are in excellent agreement with the results from all-electron and localized-orbital pseudopotential calculations. This study shows that these pseudopotentials yield accurate results for magnetic systems. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP SASAKI, T (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU INST MATERIALS RESEARCH LIBRARY PI SENDAI PA TOHOKU UNIV KATAHIRA 2-1-1, SENDAI 980, JAPAN SN 0040-8808 J9 SCI REP RES TOHOKU A JI Sci. Rep. Res. Inst. Tohoku Univ. Ser. A-Phys. Chem. Metall. PD DEC PY 1993 VL 39 IS 1 BP 37 EP 38 PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NG642 UT WOS:A1993NG64200008 ER PT J AU WOODYARD, JR SIKKA, VK AF WOODYARD, JR SIKKA, VK TI EFFECT OF ALUMINUM CONTENT ON ENVIRONMENTAL EMBRITTLEMENT IN BINARY IRON-ALUMINUM ALLOYS ACOUSTIC-EMISSION ANALYSIS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP WOODYARD, JR (reprint author), US BUR MINES,1450 QUEEN AVE SW,ALBANY,OR 97321, USA. NR 4 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1993 VL 29 IS 11 BP 1489 EP 1493 DI 10.1016/0956-716X(93)90342-P PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MB465 UT WOS:A1993MB46500020 ER PT J AU DAVIES, G LIGHTOWLERS, EC HUI, TS OZHOGIN, V ITOH, KM HANSEN, WL HALLER, EE AF DAVIES, G LIGHTOWLERS, EC HUI, TS OZHOGIN, V ITOH, KM HANSEN, WL HALLER, EE TI ISOTOPE DEPENDENCE OF THE LOWEST DIRECT ENERGY-GAP IN CRYSTALLINE GERMANIUM SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Letter ID GE AB Using optical absorption measurements we establish that the lowest direct energy gap changes with atomic mass number m at the rate dE/dm = 0.49 +/- 0.03 meV at 2 K, decreasing to 0.11 +/- 0.03 meV at 300 K, in both isotopically pure and isotopically disordered germanium. These values are broadly consistent with a simple prediction from the measured temperature dependence of the gap and the known dependence of the lattice on the isotope. We confirm, from optical absorption data, that the lowest indirect energy gap of germanium increases at the rate dE/dm = 0.36 +/- 0.01 meV, in agreement with recent photoluminescence data. C1 IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,RUSSIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP DAVIES, G (reprint author), KINGS COLL LONDON,DEPT PHYS,LONDON WC2R 2LS,ENGLAND. RI Itoh, Kohei/C-5738-2014 NR 12 TC 12 Z9 12 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD DEC PY 1993 VL 8 IS 12 BP 2201 EP 2204 DI 10.1088/0268-1242/8/12/028 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA MP127 UT WOS:A1993MP12700028 ER PT J AU EWING, RE LAZAROV, RD PASCIAK, JE VASSILEVSKI, PS AF EWING, RE LAZAROV, RD PASCIAK, JE VASSILEVSKI, PS TI DOMAIN DECOMPOSITION TYPE ITERATIVE TECHNIQUES FOR PARABOLIC PROBLEMS ON LOCALLY REFINED GRIDS SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE DISCONTINUOUS GALERKIN METHOD; LOCAL REFINEMENT; 2-LEVEL METHOD; DOMAIN DECOMPOSITION; OPTIMAL-ORDER PRECONDITIONER; GENERALIZED CONJUGATE GRADIENT METHOD; PARABOLIC PROBLEM ID POSTERIORI ERROR ESTIMATION; FINITE-ELEMENT METHOD; ELLIPTIC PROBLEMS; EQUATIONS; SUBSTRUCTURES AB Based on an extension of the discontinuous Galerkin finite element method, discretization schemes for solving parabolic problems on grids with local refinement, both in space and in time, are constructed. The stability of schemes constructed in this way is automatically ensured by the method. The construction of two-level preconditioners utilizing local timestepping and a global coarse-grid solver both on standard, rectangular, and uniform grids, is the main objective of the paper. The optimal convergence properties of such two-level preconditioners are studied. The theory is illustrated by a set of numerical examples. C1 TEXAS A&M UNIV SYST,DEPT MATH,COLL STN,TX 77843. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. RP EWING, RE (reprint author), TEXAS A&M UNIV SYST,INST SCI COMPUTAT,326 TEAGUE RES CTR,COLL STN,TX 77843, USA. RI Lazarov, Raytcho/B-8395-2015 OI Lazarov, Raytcho/0000-0002-4911-3685 NR 30 TC 8 Z9 9 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD DEC PY 1993 VL 30 IS 6 BP 1537 EP 1557 DI 10.1137/0730080 PG 21 WC Mathematics, Applied SC Mathematics GA ML187 UT WOS:A1993ML18700001 ER PT J AU WALKER, ABC DEFOREST, CE HOOVER, RB BARBEE, TW AF WALKER, ABC DEFOREST, CE HOOVER, RB BARBEE, TW TI THERMAL AND DENSITY STRUCTURE OF POLAR PLUMES .1. ANALYSIS OF EUV OBSERVATIONS WITH A MULTILAYER CASSEGRAIN TELESCOPE SO SOLAR PHYSICS LA English DT Article ID SPECTRUM AB Normal incidence multilayer coated EUV/XUV optical systems provide a powerful technique for the study of the structure of the solar corona. Such systems permit the imaging of the full solar disk and corona with high angular resolution in narrow wavelength bands that are dominated by a single line or a line multiplet excited over a well defined range of temperatures. We have photometrically analysed, and derived temperature and density information from, images of polar plumes obtained with a multilayer Cassegrain telescope operating in the wavelength interval lambda = 171 to 175 Angstrom, which is dominated by FeIx and Fex emission. This observation was obtained in October 1987, and is the first high resolution observation of an astronomical object obtained with normal incidence multilayer optics techniques. We find that photometric data taken from this observation, applied to a simple, semi-empirical model of supersonic solar wind flow, are consistent with the idea that polar plumes are a source of the solar wind. However, we are not able to uniquely trace high speed streams to polar plumes. The temperatures that we observed are typically similar to 1500 000 K for both the plumes and the interplume regions, with the plume temperatures slightly higher than those of the surrounding atmosphere. Typical electron densities of the plume and interplume regions,respectively, are 5 x 10(9) cm(-3) and 1 x 10(8) cm(-3) at the limb of the Sun. C1 STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NASA,MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. RP WALKER, ABC (reprint author), STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305, USA. NR 26 TC 44 Z9 45 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD DEC PY 1993 VL 148 IS 2 BP 239 EP 252 DI 10.1007/BF00645089 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML851 UT WOS:A1993ML85100006 ER PT J AU RUFAEL, TS KOESTNER, RJ KOLLIN, EB SALMERON, M GLAND, JL AF RUFAEL, TS KOESTNER, RJ KOLLIN, EB SALMERON, M GLAND, JL TI ADSORPTION AND THERMAL-DECOMPOSITION OF CH3SH ON THE PT(111) SURFACE SO SURFACE SCIENCE LA English DT Article ID METHANETHIOL; MO(110); MECHANISM; MOLECULES; METHANOL; NI(100); CU(111) AB Adsorption, desorption and thermal decomposition of methanethiol (CH3SH) on a clean and on a (2 x 2)-S covered Pt(111) surface have been studied using temperature programmed desorption, high resolution electron energy loss spectroscopy, and X-ray photoelectron spectroscopy as a function of temperature and coverage on the Pt(111) surface. Vibrational spectroscopy has been used to characterize the structure and bonding of surface intermediates formed during dehydrogenation of adsorbed methanethiol. The identity of surface intermediate species which form during thermal dehydrogenation is determined by both temperature and the availability of free Pt sites. Low coverages strongly favor low temperature dehydrogenation and decomposition reactions. Initial S-H bond activation does not occur at 110 K on crowded surfaces while complete decomposition of methanethiol is observed for 5% of a monolayer on a clean surface. For a saturated monolayer of methanethiol, XPS results indicate that about 60% of the carbon remains on the surface after heating to 750 K indicating that 40% of the carbon desorbs as CH4, and C2H4. The fractional yield of volatile organic products increases with increasing initial coverage of methanethiol up to monolayer coverage. The structure and geometry of the adsorbed intermediates formed by CH3SH decomposition also depends on coverage and temperature. Thermal dehydrogenation generates first CH3S, then CH2S as previously reported. In addition a new intermediate sigma-bonded SCH is identified in this work. Similar species form on the (2 x 2)-S pre-sulfided surface; however, in the pre-sulfided case the S-C bonds tend to be oriented more closely along the surface normal than they are on the clean surface. Methanethiol molecules remain intact on the pre-sulfided surface up to 180 K. C1 EXXON RES & ENGN CO,CORP RES SCI LABS,ANNANDALE,NJ 08801. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP RUFAEL, TS (reprint author), UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109, USA. NR 29 TC 34 Z9 34 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 DEC 1 PY 1993 VL 297 IS 3 BP 272 EP 285 DI 10.1016/0039-6028(93)90216-7 PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MJ594 UT WOS:A1993MJ59400013 ER PT J AU HERDT, GC CZANDERNA, AW AF HERDT, GC CZANDERNA, AW TI PENETRATION OF VACUUM-DEPOSITED SILVER INTO OCTADECANETHIOL SELF-ASSEMBLED MONOLAYERS STUDIED WITH ISS SO SURFACE SCIENCE LA English DT Letter ID 11-MERCAPTOUNDECANOIC ACID; ORGANIC-SURFACES; METAL OVERLAYERS; ADHESION; INTERFACES; GOLD AB A study of the penetration of evaporated silver overlayers into an organized molecular assembly (OMA) of octadecanethiol (ODT)-CH3(CH2)17SH self-assembled onto a gold substrate was conducted at room temperature using ISS. Spectra taken immediately after deposition show a concentration of silver at the surface of the OMA. Spectra taken after one hour after deposition of the silver show a decrease in the concentration of silver at the OMA surface. ISS spectra show no silver at the OMA surface after 16 h and a concentration of silver at the gold/thiol interface. These results not only confirm the previous work of Tarlov [Langmuir 8 (1992) 80], but also bracket the limits on the rate of penetration of the deposited silver through the ODT OMA. RP HERDT, GC (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 18 TC 19 Z9 20 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 DEC 1 PY 1993 VL 297 IS 3 BP L109 EP L112 DI 10.1016/0039-6028(93)90207-Z PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MJ594 UT WOS:A1993MJ59400004 ER PT J AU REINHARD, L MOSS, SC AF REINHARD, L MOSS, SC TI RECENT STUDIES OF SHORT-RANGE ORDER IN ALLOYS - THE COWLEY THEORY REVISITED SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT John M Cowley Symposium on Aspects of Electron Microscopy, Diffraction, Crystallography and Spectroscopy CY JAN 05-08, 1993 CL SCOTTSDALE, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV, CTR SOLID STATE SCI ID CRITICAL-TEMPERATURE; DIFFUSE-SCATTERING; ATOMIC INTERACTION; SOLID-SOLUTIONS; MONTE-CARLO; LATTICE; CU3AU AB We present comparisons of various statistical theories for effective pair interactions (EPI) in alloys. We then evaluate these EPIs using the Cowley theory, the Krivoglaz-Clapp-Moss (KCM) approximation, the gamma-expansion method (GEM) of Tokar, Masanskii and co-workers, and the exact inverse Monte Carlo (IMC) method, introduced by Gerold and Kern. Via a series of model calculations on a hypothetical bcc alloy with a single nearest-neighbor interaction we show that the Cowley theory is successful in evaluating the EPIs in more dilute alloys but tends to overestimate the magnitude of the nearest-neighbor energy at higher concentrations, whereas the KCM expression becomes increasingly inaccurate at lower concentrations. In general, however, the approximate mean-field theories are most accurate at higher concentrations and higher temperatures. Recent studies of short-range order in single crystals are discussed in which these EPIs have been evaluated using the IMC, KCM, GEM and Cowley theories. Examples include the bcc alloy Fe0.53Cr0.47 and the fee alloys Cu3Au, Cu0.69Zn0.31 and Ni0.89Cr0.11. In all cases the approximate expressions do quite well, especially the GEM. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. RP REINHARD, L (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV CONDENSED MATTER L268,LIVERMORE,CA 94550, USA. NR 35 TC 22 Z9 22 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1993 VL 52 IS 3-4 BP 223 EP 232 DI 10.1016/0304-3991(93)90028-V PG 10 WC Microscopy SC Microscopy GA MT144 UT WOS:A1993MT14400002 ER PT J AU GLAESER, RM DOWNING, KH AF GLAESER, RM DOWNING, KH TI HIGH-RESOLUTION ELECTRON CRYSTALLOGRAPHY OF PROTEIN MOLECULES SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT John M Cowley Symposium on Aspects of Electron Microscopy, Diffraction, Crystallography and Spectroscopy CY JAN 05-08, 1993 CL SCOTTSDALE, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV, CTR SOLID STATE SCI ID ATOMIC RESOLUTION; PURPLE MEMBRANE; CRYSTALS; THIN; CRYSTALLIZATION; MACROMOLECULES; ARCHITECTURE; DIFFRACTION; MICROSCOPY AB Electron diffraction data and high-resolution images can now be used to obtain accurate, three-dimensional density maps of biological macromolecules. These density maps can be interpreted by building an atomic-resolution model of the structure into the experimental density. The Cowley-Moodie formalism of dynamical diffraction theory has been used to validate the use of kinematic diffraction theory (strictly, the weak phase object approximation) in producing such 3D density maps. Further improvements in the preparation of very flat (planar) specimens and in the retention of diffraction to a resolution of 0.2 nm or better could result in electron crystallography becoming as important a technique as X-ray crystallography currently is for the field of structural molecular biology. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DONNER LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP GLAESER, RM (reprint author), UNIV CALIF BERKELEY,STANLEY DONNER ASU,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [GM36884] NR 33 TC 19 Z9 19 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1993 VL 52 IS 3-4 BP 478 EP 486 DI 10.1016/0304-3991(93)90064-5 PG 9 WC Microscopy SC Microscopy GA MT144 UT WOS:A1993MT14400038 PM 8116103 ER PT J AU WANG, ZL AF WANG, ZL TI THERMAL DIFFUSE-SCATTERING IN HIGH-RESOLUTION ELECTRON HOLOGRAPHY SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT John M Cowley Symposium on Aspects of Electron Microscopy, Diffraction, Crystallography and Spectroscopy CY JAN 05-08, 1993 CL SCOTTSDALE, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV, CTR SOLID STATE SCI ID DIFFRACTION; MICROSCOPY AB A theory for wave function simulations with inclusion of thermal diffuse scattering (TDS) in electron holography is outlined. The inelastic thermal diffuse scattered electrons do not contribute to the sidebands but introduce an absorption factor in the simulated elastic wave. The TDS absorption effects are significant in the simulated amplitude but not in the phase and become important only when the image resolution approaches atomic level (< 1.6 Angstrom). Valence, single electron and even phonon inelastically scattered electrons do not affect the sidebands of the off-axis holograms, thus the reconstructed wave function from a hologram is an essentially zero-loss, energy-filtered image of the specimen. In contrast, inelastically scattered electrons including the TDS electrons do contribute to conventional high-resolution transmission electron microscopy (HRTEM) images. This simply means that quantitative analysis of electron holograms may be easier than the analysis of HRTEM images. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 24 TC 9 Z9 9 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1993 VL 52 IS 3-4 BP 504 EP 511 DI 10.1016/0304-3991(93)90067-8 PG 8 WC Microscopy SC Microscopy GA MT144 UT WOS:A1993MT14400041 ER PT J AU ZHU, YM CAI, ZX AF ZHU, YM CAI, ZX TI DIFFUSE-SCATTERING AND IMAGE-CONTRAST OF TWEED IN SUPERCONDUCTING OXIDES - SIMULATION AND INTERPRETATION SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT John M Cowley Symposium on Aspects of Electron Microscopy, Diffraction, Crystallography and Spectroscopy CY JAN 05-08, 1993 CL SCOTTSDALE, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV, CTR SOLID STATE SCI ID STRAIN-RELATED MORPHOLOGY; NI-AL ALLOYS; BASAL-PLANE; MONTE-CARLO; OXYGEN; YBA2CU3O7-DELTA; MICROSTRUCTURES; MODULATIONS; SYSTEMS AB Monte Carlo simulations were performed with a lattice gas model to represent the interactions between oxygen atoms in the YBa2(Cu(1-x)M(x))(3)O-7+delta (M = Fe, Co or Al, 0.03 < x < 0.1) system. The amplitudes of concentration waves/displacement waves obtained from these simulations were used to calculate the intensity of the diffuse scattering of tweed seen in the electron diffraction pattern. The characteristic features of the tweed image were produced using a model based on contrast originating from structures with displacive modulation, stacking on top of each other. Both calculations agree well with the TEM observations and provide a useful basis for better insight into the origin of the tweed structure. RP ZHU, YM (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 28 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1993 VL 52 IS 3-4 BP 539 EP 548 DI 10.1016/0304-3991(93)90071-5 PG 10 WC Microscopy SC Microscopy GA MT144 UT WOS:A1993MT14400045 ER PT J AU LILIENTALWEBER, Z NAMAVAR, F CLAVERIE, A AF LILIENTALWEBER, Z NAMAVAR, F CLAVERIE, A TI ARSENIC IMPLANTATION INTO GAAS - A SOI TECHNOLOGY FOR COMPOUND SEMICONDUCTORS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT John M Cowley Symposium on Aspects of Electron Microscopy, Diffraction, Crystallography and Spectroscopy CY JAN 05-08, 1993 CL SCOTTSDALE, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV, CTR SOLID STATE SCI ID MOLECULAR-BEAM EPITAXY; LOW-TEMPERATURE; LAYERS AB Solid-phase epitaxial regrowth of As+-implanted GaAs has produced As precipitates with the same structure and orientation relationship as has been observed in annealed GaAs layers grown at low temperature by molecular-beam epitaxy. The presence of these precipitates was revealed by transmission electron microscopy. These layers appear to be semi-insulating. In order to obtain these results, implantation and annealing conditions need to be carefully selected. Annealing of implanted samples at 600 degrees C for 10, 20 and 30 min does not lead to the undulation of the sample surface. Therefore any device structures such as semiconductor-on-insulator can be grown on this regrown material. C1 SPIRE CORP,BEDFORD,MA 01730. CNRS,CEMES,F-31055 TOULOUSE,FRANCE. RP LILIENTALWEBER, Z (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 16 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1993 VL 52 IS 3-4 BP 570 EP 574 DI 10.1016/0304-3991(93)90075-9 PG 5 WC Microscopy SC Microscopy GA MT144 UT WOS:A1993MT14400049 ER PT J AU HUTTEN, A THOMAS, G AF HUTTEN, A THOMAS, G TI INVESTIGATION OF HETEROGENEOUS CU1-XCOX ALLOYS WITH GIANT MAGNETORESISTANCE SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT John M Cowley Symposium on Aspects of Electron Microscopy, Diffraction, Crystallography and Spectroscopy CY JAN 05-08, 1993 CL SCOTTSDALE, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV, CTR SOLID STATE SCI AB The decomposition kinetics of Cu1-xCox alloys have been investigated based on the theory of spinodal decomposition. Microstructural parameters such as size and concentration of compositional modulations have been predicted for as-prepared and subsequently annealed Cu81Co19 and Cu65Co35 samples. These predicted values have been compared with those determined experimentally from a combination of electron microscopy and field ion microscopy. The discussion emphasizes a possible application of a known decomposition mechanism and evaluated microstructural parameters to improve the amplitude of giant magnetoresistance in heterogeneous Cu1-xCox samples. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP HUTTEN, A (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. RI Hutten, Andreas/B-3524-2011 NR 21 TC 38 Z9 38 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1993 VL 52 IS 3-4 BP 581 EP 590 DI 10.1016/0304-3991(93)90077-B PG 10 WC Microscopy SC Microscopy GA MT144 UT WOS:A1993MT14400051 ER PT J AU YOUNG, PJ MEGONIGAL, JP SHARITZ, RR DAY, FP AF YOUNG, PJ MEGONIGAL, JP SHARITZ, RR DAY, FP TI FALSE RING FORMATION IN BALDCYPRESS (TAXODIUM-DISTICHUM) SAPLINGS UNDER 2 FLOODING REGIMES SO WETLANDS LA English DT Article DE ANNUAL RINGS; BALDCYPRESS; FALSE RINGS; FLOODING; GROWTH RESPONSE AB Baldcypress saplings were subjected to two flooding regimes of continuous and periodic inundation for three years to allow comparison of annual ring characteristics. Basal stem discs were examined for the number and nature of intra-annual response features, such as false rings. The formation of latewood was also compared for trees from each flooding regime. Radial growth was significantly greater in saplings from the continuously flooded treatments for years 2 and 3. No significant difference was found between treatments for the total number of response features present; however, periodically flooded saplings developed a significantly higher number of major false rings. Trees from this regime also consistently produced a greater number of thick-walled, latewood-type cells associated with false rings and annual rings. RP YOUNG, PJ (reprint author), SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802, USA. NR 0 TC 28 Z9 30 U1 6 U2 10 PU SOC WETLAND SCIENTISTS PI LAWRENCE PA 810 E TENTH ST, P O BOX 1897, LAWRENCE, KS 66044 SN 0277-5212 J9 WETLANDS JI Wetlands PD DEC PY 1993 VL 13 IS 4 BP 293 EP 298 PG 6 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA MP634 UT WOS:A1993MP63400007 ER PT J AU COWLEY, RA AHARONY, A BIRGENEAU, RJ PELCOVITS, RA SHIRANE, G THURSTON, TR AF COWLEY, RA AHARONY, A BIRGENEAU, RJ PELCOVITS, RA SHIRANE, G THURSTON, TR TI THE BICRITICAL PHASE-DIAGRAM OF 2-DIMENSIONAL ANTIFERROMAGNETS WITH AND WITHOUT RANDOM-FIELDS SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID DIMENSIONAL ANTI-FERROMAGNETS; + EPSILON-DIMENSIONS; ISING-MODEL; NEUTRON-SCATTERING; SPIN FLUCTUATIONS; CRITICAL-BEHAVIOR; TETRACRITICAL POINTS; MAGNETIC SYSTEMS; RANDOM-EXCHANGE; TRANSITION AB Neutron scattering measurements have been made of the phase diagrams of the nearly two-dimensional antiferromagnets Rb2MnF4 and Rb2Mn0.7Mg0.3F4 in a magnetic field applied along the c-axis. In Rb2MnF4 there is at low temperatures a spin-flop phase at fields above 5.5 T which has long range order. The observation of true long range order rather than the algebraic decay of the order characteristic of the two-dimensional XY model is presumably due to subtle anisotropy effects in the plane as well as weak three-dimensional coupling. The phase boundaries of the uniaxial and transverse phases are shown to be consistent with renormalization group predictions for two-dimensional systems. The two lines become exponentially close to each other at low temperatures. The weak three-dimensional coupling moves the bicritical point from T=0 to a non-zero temperature. The situation is more complex in Rb2Mn0.7Mg0.3F4 because of Ising random field effects. At low fields we observe typical random field metastable behavior with a sharp metastability boundary and a range of length scales which are time independent below that boundary. At higher fields there are substantial uniaxial fluctuations. The transverse phase boundary and the metastability line appear to intercept at T=0 showing that the random field fluctuations do have a large effect on the phase diagram. The theory of the phase diagrams has been extended to include the random field fluctuations and good agreement is obtained with the observed transverse phase boundary. Unfortunately, there is as yet no theory of the metastable uniaxial phase with which to compare our results. C1 BROWN UNIV, DEPT PHYS, PROVIDENCE, RI 02912 USA. UNIV OXFORD, CLARENDON LAB, OXFORD OX1 3PU, ENGLAND. TEL AVIV UNIV, SCH PHYS & ASTRON, RAYMOND & BEVERLY SACKLER FAC EXACT SCI, IL-69978 TEL AVIV, ISRAEL. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. RP COWLEY, RA (reprint author), BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NR 44 TC 28 Z9 30 U1 0 U2 3 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0722-3277 J9 Z PHYS B CON MAT JI Z. Phys. B-Condens. Mat. PD DEC PY 1993 VL 93 IS 1 BP 5 EP 19 DI 10.1007/BF01308802 PG 15 WC Physics, Condensed Matter SC Physics GA MJ942 UT WOS:A1993MJ94200002 ER PT J AU BUSHAW, BA KLUGE, HJ LANTZSCH, J SCHWALBACH, R STENNER, J STEVENS, H WENDT, K ZIMMER, K AF BUSHAW, BA KLUGE, HJ LANTZSCH, J SCHWALBACH, R STENNER, J STEVENS, H WENDT, K ZIMMER, K TI HYPERFINE-STRUCTURE IN 5S 4D D-3 - 5SNF TRANSITIONS OF SR-87 SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article ID RYDBERG STATES; LASER SPECTROSCOPY; SRI AB The hyperfine spectra of the 5s4d(3)D(1)-5s20f, 5s4d(3)D(2)-5s23f, and 5s4d(3)D(3)-5s32f transitions of Sr-87 (I= 9/2) have been measured by collinear fast beam laser spectroscopy. The structure in the upper configurations is highly perturbed by fine structure splitting that is of comparable size to the hyperfine interaction energy. These perturbations can be adequately treated with conventional matrix diagonalization methods, using the 5s-electron magnetic dipole interaction term a(5s) and the unperturbed fine structure splittings as input parameters. Additionally, hyperfine constants for the lower 5s4d(3)D configurations, including the A- and B-factors and a separation of the individual s- and d-electron contributions to these factors, are derived. C1 UNIV MAINZ, INST PHYS, D-55099 MAINZ, GERMANY. RP BUSHAW, BA (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Wendt, Klaus/D-7306-2011 OI Wendt, Klaus/0000-0002-9033-9336 NR 21 TC 9 Z9 9 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD DEC PY 1993 VL 28 IS 4 BP 275 EP 281 PG 7 WC Physics, Atomic, Molecular & Chemical SC Physics GA ML211 UT WOS:A1993ML21100002 ER PT J AU GOLDEN, BL HOFFMAN, DW RAMAKRISHNAN, V WHITE, SW AF GOLDEN, BL HOFFMAN, DW RAMAKRISHNAN, V WHITE, SW TI RIBOSOMAL PROTEIN-S17 - CHARACTERIZATION OF THE 3-DIMENSIONAL STRUCTURE BY H-1-NMR AND N-15-NMR SO BIOCHEMISTRY LA English DT Article ID SMALL NUCLEAR RIBONUCLEOPROTEIN; ESCHERICHIA-COLI RIBOSOME; RNA-BINDING DOMAIN; BACILLUS-STEAROTHERMOPHILUS; CRYSTAL-STRUCTURE; NMR-SPECTROSCOPY; CROSS-LINKING; 16S RNA; SUBUNITS; S17 AB The structure of ribosomal protein S17 from Bacillus stearothermophilus was investigated by two-dimensional homonuclear and heteronuclear magnetic resonance spectroscopy. The H-1 and N-15 chemical shift assignments are largely complete, and a preliminary structural characterization is presented. The protein consists of five beta-strands that form a single antiparallel beta-sheet with Greek-key topology. The beta-strands are connected by several extended loops, and two of these contain residue types that are frequently seen in the RNA-binding sites of proteins. Additionally, two point mutations that affect antibiotic resistance, translational fidelity, and ribosome assembly are located in these two regions of the protein. Since these potential RNA-binding sites are distributed over a large surface of the protein, it appears that the molecule may interact with several regions of 16S rRNA. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. DUKE UNIV,MED CTR,DEPT MICROBIOL,DURHAM,NC 27710. OI Golden, Barbara/0000-0002-9741-882X NR 71 TC 62 Z9 65 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 NOV 30 PY 1993 VL 32 IS 47 BP 12812 EP 12820 DI 10.1021/bi00210a033 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MJ990 UT WOS:A1993MJ99000033 PM 8251502 ER PT J AU RIDER, WJ AF RIDER, WJ TI METHODS FOR EXTENDING HIGH-RESOLUTION SCHEMES TO NONLINEAR-SYSTEMS OF HYPERBOLIC CONSERVATION-LAWS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE EULER EQUATIONS; CONSERVATIVE VARIABLES; PRIMITIVE VARIABLES; HIGH-RESOLUTION ID GODUNOV-TYPE METHODS; SHOCK-CAPTURING SCHEMES; DIFFERENCE SCHEME; EFFICIENT IMPLEMENTATION; GAS-DYNAMICS AB In extending high-resolution methods from the scalar case to systems of equations there are a number of options available. These options include working with either conservative or primitive variables, characteristic decomposition, two-step methods, or component-wise extension. In this paper, several of these options are presented and compared in terms of economy and solution accuracy. The characteristic extension with either conservative or primitive variables produces excellent results with all the problems solved. Using primitive variables, the two-step formulation produces high-quality results in a more economical manner. This method can also be extended to multiple dimensions without resorting to dimensional splitting. Proper selection of limiters is also important in non-characteristic extension to systems. RP LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 35 TC 8 Z9 10 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0271-2091 EI 1097-0363 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD NOV 30 PY 1993 VL 17 IS 10 BP 861 EP 885 DI 10.1002/fld.1650171004 PG 25 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA MG267 UT WOS:A1993MG26700003 ER PT J AU WANG, CZ ZHANG, BL HO, KM WANG, XQ AF WANG, CZ ZHANG, BL HO, KM WANG, XQ TI STRUCTURE, STABILITY, AND ELECTRONIC-PROPERTIES OF LARGE FULLERENES SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Review ID LARGE CARBON CLUSTERS; GROUND-STATE; C-60; C-84; C84; ISOMERS; C-70; BUCKMINSTERFULLERENE; SEARCH; CAGES AB The recent development in understanding the structures, relative stability, and electronic properties of large fullerenes is reviewed. We describe an efficient scheme to generate the ground-state networks for fullerene clusters. Combining this scheme with quantum-mechanical total-energy calculations, the ground-state structures of fullerenes ranging from C-20 to C-100 have been studied. Fullerenes of sizes 60, 70, and 84 are found to be energetically more stable than their neighbors. In addition to the energies, the fragmentation stability and the chemical reactivity of the clusters are shown to be important in determining the abundance of fullerene isomers. C1 IOWA STATE UNIV,DEPT PHYS,AMES,IA 50011. CLARK ATLANTA UNIV,CTR THEORET STUDIES PHYS SYST,ATLANTA,GA 30314. RP WANG, CZ (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. NR 55 TC 17 Z9 17 U1 0 U2 6 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD NOV 30 PY 1993 VL 7 IS 26 BP 4305 EP 4329 DI 10.1142/S0217979293003681 PG 25 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA ML776 UT WOS:A1993ML77600001 ER PT J AU LARACURZIO, E STERNSTEIN, SS HUBBARD, CR CAVIN, B PORTER, W AF LARACURZIO, E STERNSTEIN, SS HUBBARD, CR CAVIN, B PORTER, W TI HIGH-TEMPERATURE STRUCTURAL STABILITY OF CHEMICALLY VAPOR-DEPOSITED SILICON-CARBIDE FILAMENTS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB The structural stability of SCS-6 filament was investigated in the temperature interval 1000-1600-degrees-C by differential scanning calorimetry (DSC) and in situ X-ray diffraction techniques. It was found that this filament is composed mostly of the cubic beta polytype of SiC and of graphite, and that these phases are stable in the temperature interval studied. The lattice parameter for beta-SiC was determined between room temperature and 1600-degrees-C, and the calculated average linear thermal expansion of the lattice in this temperature interval (5.24 x 10(-6)-degrees-C-1) is in agreement with macroscopic thermal expansion measurements on single filaments. Thermal events observed by DSC occur at 1380-degrees-C on heating and at 1300-degrees-C on cooling, and are suggested as being related to the melting and solidification, respectively, of excess silicon. These results are analysed in relation to the anomalous thermal expansion behavior exhibited by this filament. C1 RENSSELAER POLYTECH INST,CTR COMPOSITE MAT & STRUCT,TROY,NY 12180. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. NR 15 TC 8 Z9 8 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD NOV 30 PY 1993 VL 172 IS 1-2 BP 167 EP 171 DI 10.1016/0921-5093(93)90437-J PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA MJ647 UT WOS:A1993MJ64700018 ER PT J AU MCCAMY, JW LOWNDES, DH AF MCCAMY, JW LOWNDES, DH TI PULSED-LASER ABLATION GROWTH OF EPITAXIAL ZNSE1-XSX FILMS AND SUPERLATTICES WITH CONTINUOUSLY VARIABLE COMPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID EPILAYERS AB We describe a new method to grow epitaxial semiconductor alloys with continuously variable composition, while using a single pulsed laser ablation target of fixed composition. Epitaxial ZnSe1-xSx films with continuously variable sulfur content, x, were grown by ablating a ZnSe target through low-pressure ambient H2S gas. The sulfur content was easily controlled in the range 0 < x < 0.18 by varying the H2S partial pressure from 0 to 45 mTorr, for films grown at 325-degrees-C. ZnSe1-xSx films differing in composition by as much as x=0.52 from the pure ZnSe target have been grown at 400-degrees-C. We have used this method to grow heteroepitaxial structures with continuously graded or periodically repeating, abrupt compositional changes (compositional superlattices). This development removes the principal barrier to pulsed-laser ablation (PLA) growth of compositionally graded semiconductor thin-film materials, namely that the film and target normally have the same composition. The method appears to have broad application for PLA growth of other compound semiconductor films and heterostuctures, as well as to dope individual layers. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MCCAMY, JW (reprint author), UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996, USA. NR 14 TC 11 Z9 11 U1 0 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 NOV 29 PY 1993 VL 63 IS 22 BP 3008 EP 3010 DI 10.1063/1.110267 PG 3 WC Physics, Applied SC Physics GA MJ819 UT WOS:A1993MJ81900008 ER PT J AU TSUNODA, Y NICKLOW, RM AF TSUNODA, Y NICKLOW, RM TI MAGNETIC-STRUCTURE OF GAMMA-FE PRECIPITATES IN CU .2. TRANSVERSE SPIN COMPONENT SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID IRON; WAVE AB The 100 magnetic diffuse peak of gamma-Fe precipitates in Cu is re-examined by means of neutron diffraction. The distribution of the diffuse scattering intensity extends along the [010] direction. A magnetic structure is proposed with transverse spin components along the c axis in addition to the coexistence of the double-Q spin structure and periodic lattice distortion on the c plane previously reported. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP TSUNODA, Y (reprint author), OSAKA UNIV,FAC SCI,TOYONAKA,OSAKA 560,JAPAN. NR 16 TC 5 Z9 5 U1 0 U2 0 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 NOV 29 PY 1993 VL 5 IS 48 BP 8999 EP 9008 DI 10.1088/0953-8984/5/48/010 PG 10 WC Physics, Condensed Matter SC Physics GA MK410 UT WOS:A1993MK41000010 ER PT J AU SOMERVILLE, CR AF SOMERVILLE, CR TI PRODUCTION OF INDUSTRIAL MATERIALS IN TRANSGENIC PLANTS SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES LA English DT Article ID CARRIER-PROTEIN DESATURASE; FOREIGN GENES; EXPRESSION; SEED; ARABIDOPSIS; TOBACCO; FATS; OILS AB Millions of tonnes of organic chemicals, or polymeric derivatives, are produced annually from agricultural plants. Genetic engineering methods can be used to modify the chemical composition of the storage compounds in many plant species. This will create opportunities to expand the uses of biomaterials as renewable and environmentally more benign alternatives to some uses of petrochemicals. Many of the most promising opportunities, in this respect, involve relatively minor modifications of the chemical composition of plant oils. The introduction of a single functional group into a fatty acid may create new industrial uses for the fatty acid and, therefore, significantly increase the value of the oil. Because different species of higher plants accumulate at least 210 different kinds of fatty acids, the genetic resources are available to support the production of a wide variety of modifications of agricultural oilseed species by genetic engineering. In addition, a large number of useful modifications may be produced by introducing genes for fatty-acid modifying enzymes, or related aspects of metabolism, from microorganisms. RP SOMERVILLE, CR (reprint author), MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824, USA. RI Somerville, Christopher/A-4048-2009 OI Somerville, Christopher/0000-0003-4647-0094 NR 32 TC 9 Z9 9 U1 1 U2 1 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8436 J9 PHILOS T ROY SOC B JI Philos. Trans. R. Soc. Lond. Ser. B-Biol. Sci. PD NOV 29 PY 1993 VL 342 IS 1301 BP 251 EP 257 DI 10.1098/rstb.1993.0154 PG 7 WC Biology SC Life Sciences & Biomedicine - Other Topics GA ML526 UT WOS:A1993ML52600010 ER PT J AU MARCIANO, WJ SIRLIN, A AF MARCIANO, WJ SIRLIN, A TI RADIATIVE-CORRECTIONS TO PI(12) DECAYS SO PHYSICAL REVIEW LETTERS LA English DT Article ID O(ALPHA) CORRECTIONS; BRANCHING RATIO; SCATTERING DATA; TAU-DECAY; LIFETIME; PION AB Radiative corrections to pi(l2) (l = e or mu) decays are examined. Higher order electroweak leading logarithms, short-distance QCD corrections, and structure dependent effects are incorporated. The results are employed to (1) test e-mu universality in GAMMA(pi --> enu(e)BAR(gamma))/GAMMA(pi --> munu(mu)BAR(gamma)), (2) extract an f(pi) which is used to check the Goldberger-Treiman relation and PCAC-anomaly prediction for GAMMA(pi0 --> gammagamma), and (3) determine the tau partial decay rate GAMMA(tau --> pinu(tau)(gamma)). C1 NYU,DEPT PHYS,NEW YORK,NY 10003. RP MARCIANO, WJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 32 TC 177 Z9 177 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 NOV 29 PY 1993 VL 71 IS 22 BP 3629 EP 3632 DI 10.1103/PhysRevLett.71.3629 PG 4 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700004 ER PT J AU OSHEA, PG BENDER, SC BYRD, DA EARLY, JW FELDMAN, DW FORTGANG, CM GOLDSTEIN, JC NEWNAM, BE SHEFFIELD, RL WARREN, RW ZAUGG, TJ AF OSHEA, PG BENDER, SC BYRD, DA EARLY, JW FELDMAN, DW FORTGANG, CM GOLDSTEIN, JC NEWNAM, BE SHEFFIELD, RL WARREN, RW ZAUGG, TJ TI ULTRAVIOLET FREE-ELECTRON LASER-DRIVEN BY A HIGH-BRIGHTNESS 45-MEV ELECTRON-BEAM SO PHYSICAL REVIEW LETTERS LA English DT Article ID FEL; PERFORMANCE; DESIGN; PHOTOINJECTOR; OPERATION; FACILITY AB We report on experimental studies of an ultraviolet (UV) free-electron laser (FEL) oscillator driven by low-energy electrons from a radio-frequency linear accelerator. Previous UV FELs have been driven by 350-800-MeV electrons from storage rings. We verify the concept of driving an UV FEL with a low-energy, but high-current, low-emittance electron beam. This and other innovations allowed the FEL to lase at wavelengths from 369 to 380 nm using 45.9-45.2-MeV electrons, and to achieve a peak optical output power of 270 kW. The experimental results are in good agreement with simulations. RP OSHEA, PG (reprint author), ARGONNE NATL LAB,APEX FREE ELECTRON LASER LAB,MS H825,ARGONNE,IL 60439, USA. NR 26 TC 22 Z9 22 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 NOV 29 PY 1993 VL 71 IS 22 BP 3661 EP 3664 DI 10.1103/PhysRevLett.71.3661 PG 4 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700012 ER PT J AU EMERY, VJ KIVELSON, SA AF EMERY, VJ KIVELSON, SA TI SOLUTION OF AN ORBITAL KONDO ARRAY SO PHYSICAL REVIEW LETTERS LA English DT Article ID XY-MODEL AB We introduce a solvable model of a one-dimensional electron gas interacting with an array of dynamical scattering centers, whose state is specified by a pseudospin variable. In the dilute limit, for frequencies omega and temperatures T below the single-center Kondo scale but above a coherence scale DELTA, the physics is governed by the fixed point of the single-impurity two-channel Kondo problem, and the physical properties are reminiscent of the normal state of the high-temperature superconductors. As omega and T --> 0, three susceptibilities are equally divergent: (I ) conventional, spin-singlet even-parity pairing, (2) composite spin-singlet odd-parity pairing, and (3) odd-parity pseudospin. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP EMERY, VJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 12 TC 59 Z9 59 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 NOV 29 PY 1993 VL 71 IS 22 BP 3701 EP 3704 DI 10.1103/PhysRevLett.71.3701 PG 4 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700022 ER PT J AU KAPER, HG LEAF, GK LEVINE, DM VINOKUR, V AF KAPER, HG LEAF, GK LEVINE, DM VINOKUR, V TI GLASSY MOTION OF AN ELASTIC STRING SO PHYSICAL REVIEW LETTERS LA English DT Article ID RANDOM-MEDIA; DYNAMICS; SUPERCONDUCTORS; TRANSITIONS; INTERFACES; CREEP; LINES AB Numerical simulations of a driven elastic string in a quenched random potential at finite temperatures support the existence of glassy motion for sufficiently weak driving forces. Avalanchelike string motion is observed in the transition region. RP KAPER, HG (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 18 TC 11 Z9 11 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 NOV 29 PY 1993 VL 71 IS 22 BP 3713 EP 3716 DI 10.1103/PhysRevLett.71.3713 PG 4 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700025 ER PT J AU GILLILAND, GD ANTONELLI, A WOLFORD, DJ BAJAJ, KK KLEM, J BRADLEY, JA AF GILLILAND, GD ANTONELLI, A WOLFORD, DJ BAJAJ, KK KLEM, J BRADLEY, JA TI DIRECT MEASUREMENT OF HEAVY-HOLE EXCITON TRANSPORT IN TYPE-II GAAS/ALAS SUPERLATTICES SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAAS-ALAS SUPERLATTICES; HETEROSTRUCTURES; SEMICONDUCTOR AB We have directly measured the transport of heavy-hole excitons in a type-II GaAs/AlAs superlattice, Our results constitute the first direct confirmation of exciton localization in type-II structures and thermal activation to more mobile states. We have also developed a quantitative model to explain our transport and kinetics results, and have obtained the nonradiative interfacial defect density. C1 IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP GILLILAND, GD (reprint author), EMORY UNIV,DEPT PHYS,ATLANTA,GA 30322, USA. RI Antonelli, Alex/D-4104-2012 OI Antonelli, Alex/0000-0002-2784-812X NR 20 TC 36 Z9 36 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 29 PY 1993 VL 71 IS 22 BP 3717 EP 3720 DI 10.1103/PhysRevLett.71.3717 PG 4 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700026 ER PT J AU MA, Y SKYTT, P WASSDAHL, N GLANS, P MANCINI, DC GUO, J NORDGREN, J AF MA, Y SKYTT, P WASSDAHL, N GLANS, P MANCINI, DC GUO, J NORDGREN, J TI CORE EXCITONS AND VIBRONIC COUPLING IN DIAMOND AND GRAPHITE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ABSORPTION FINE-STRUCTURE; SELF-TRAPPED-EXCITON; PHONON RELAXATION; RAY; SCATTERING; SPECTRA; EDGE AB The C 1s exciton in diamond is studied by soft x-ray emission excited with high resolution monochromatic photons. A strong phonon sideband of 5 eV wide is observed in the exciton recombination spectrum. With the phonon contribution, the exciton binding energy is estimated to be 1.5 eV. The excited atom is suggested to undergo Jahn-Teller relaxation similar to that of the nitrogen impurities in diamond. A similar exciton is observed at the sigma*-band threshold in graphite. These results provide new insights to the understanding of the core exciton and the donor problem in diamond and other systems. C1 UNIV UPPSALA, DEPT PHYS, S-75105 UPPSALA, SWEDEN. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP MA, Y (reprint author), UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA. NR 25 TC 160 Z9 160 U1 3 U2 15 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 NOV 29 PY 1993 VL 71 IS 22 BP 3725 EP 3728 DI 10.1103/PhysRevLett.71.3725 PG 4 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700028 ER PT J AU JESSON, DE PENNYCOOK, SJ TISCHLER, JZ BUDAI, JD BARIBEAU, JM HOUGHTON, DC AF JESSON, DE PENNYCOOK, SJ TISCHLER, JZ BUDAI, JD BARIBEAU, JM HOUGHTON, DC TI SURFACE-MORPHOLOGY AND ALLOY ORDERING IN EPITAXIAL-GROWTH OF SIGE - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID LONG-RANGE ORDER; SEGREGATION; SILICON C1 NATL RES COUNCIL CANADA,INST MICROSTRUCT SCI,OTTAWA K1A 0R6,ONTARIO,CANADA. RP JESSON, DE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Budai, John/R-9276-2016; OI Budai, John/0000-0002-7444-1306; Jesson, David/0000-0003-0897-1445 NR 13 TC 3 Z9 3 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 NOV 29 PY 1993 VL 71 IS 22 BP 3737 EP 3737 DI 10.1103/PhysRevLett.71.3737 PG 1 WC Physics, Multidisciplinary SC Physics GA MJ837 UT WOS:A1993MJ83700032 ER PT J AU LEDERMAN, LM AF LEDERMAN, LM TI WHAT CAN WE LEARN FROM THE SUPERCOLLIDERS DEMISE SO SCIENTIST LA English DT Editorial Material AB Nobel Prize-winning physicist Leon M. Lederman laments Congress' rejection of the superconducting supercollider, observing that the megaproject's termination is symptomatic, among other things, of the general public's science illiteracy. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP LEDERMAN, LM (reprint author), IIT,CHICAGO,IL 60616, USA. NR 0 TC 1 Z9 1 U1 1 U2 2 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD NOV 29 PY 1993 VL 7 IS 23 BP 12 EP 12 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA MJ269 UT WOS:A1993MJ26900008 ER PT J AU ROGERS, F AF ROGERS, F TI HOT PAPERS - ASTROPHYSICS - RADIATIVE ATOMIC ROSSELAND MEAN OPACITY TABLES BY ROGERS,F.J., IGLESIAS,C.A. SO SCIENTIST LA English DT Article AB An astrophysicist discusses his paper on the opacity of stellar matter. RP ROGERS, F (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD NOV 29 PY 1993 VL 7 IS 23 BP 16 EP 16 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA MJ269 UT WOS:A1993MJ26900014 ER PT J AU MORRISON, JC BOTTCHER, C AF MORRISON, JC BOTTCHER, C TI SPLINE COLLOCATION METHODS FOR CALCULATING ORBITAL ENERGIES SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID EQUATION; LATTICE; HELIUM AB The accuracy of the spline collocation method for solving molecular orbital equations is tested for the hydrogen atom. Two different types of grids are used that concentrate points near the nucleus. A 40 point grid defined by a polynomial transformation, which is suitable for molecular calculations, is found to produce an accuracy within a mHartree of the exact value. For many electron systems, we have previously employed an algorithm for solving Poisson's equation which uses the eigenvectors of the kinetic energy matrices as a basis. In order to ensure the accuracy of the eigenvalues and eigenvectors of the kinetic energy, a method is implemented using scaled splines that leads to kinetic energy matrices having a simple block structure. The eigenvalues of the kinetic energy matrices in this scheme are quite accurate. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP MORRISON, JC (reprint author), UNIV LOUISVILLE,DEPT PHYS,LOUISVILLE,KY 40292, USA. NR 15 TC 7 Z9 8 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 NOV 28 PY 1993 VL 26 IS 22 BP 3999 EP 4006 DI 10.1088/0953-4075/26/22/007 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MK412 UT WOS:A1993MK41200007 ER PT J AU PAPP, T CAMPBELL, JL RAMAN, S AF PAPP, T CAMPBELL, JL RAMAN, S TI EXPERIMENTAL TEST OF DIRAC-FOCK VERSUS DIRAC-HARTREE-SLATER L X-RAY-INTENSITY RATIOS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID ENERGY-DISPERSIVE MEASUREMENTS; EMISSION RATES; VALUES; PIXE AB Energy-dispersive L x-ray spectra of uranium and gadolinium were recorded in both singles and coincidence mode and fitted with attention to both detector lineshape and Lorentzian broadening. The relative line intensities in the L, L(1), L(2) and L(3) x-ray series were deduced. These results favour the predictions of the Dirac-Fock model over those of the Dirac-Hartree-Slater model. This conclusion has implications for measurements of quantities such as L subshell ionization cross sections by charged particles, because the interpretation of such measurements relies in part upon a data base of relative L x-ray line intensities. C1 HUNGARIAN ACAD SCI,INST NUCL RES,H-4001 DEBRECEN,HUNGARY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PAPP, T (reprint author), UNIV GUELPH,GUELPH WATERLOO PROGRAM GRAD WORK PHYS,GUELPH N1G 2W1,ON,CANADA. NR 23 TC 27 Z9 27 U1 0 U2 3 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 NOV 28 PY 1993 VL 26 IS 22 BP 4007 EP 4017 DI 10.1088/0953-4075/26/22/008 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MK412 UT WOS:A1993MK41200008 ER PT J AU CAO, H DICICCO, D SUCKEWER, S AF CAO, H DICICCO, D SUCKEWER, S TI QUENCHING A-COEFFICIENTS BY PHOTONS IN A SHORT DISCHARGE-TUBE SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID PLASMAS; EMISSION AB New experimental results on quenching of A-coefficients by photons in a short discharge tube are presented. Experiments with the short discharge tube have eliminated questions related to the effects of absorption in a long laser tube, and have provided good confirmation of earlier results. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP CAO, H (reprint author), PRINCETON UNIV,DEPT MECH & AEROSP ENGN,PRINCETON,NJ 08544, USA. RI Cao, Hui/F-4815-2012 NR 11 TC 2 Z9 2 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 NOV 28 PY 1993 VL 26 IS 22 BP 4057 EP 4064 DI 10.1088/0953-4075/26/22/011 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MK412 UT WOS:A1993MK41200011 ER PT J AU WOLFF, W WOLF, HE SHINPAUGH, JL WANG, J OLSON, RE FAINSTEIN, PD LENCINAS, S BECHTHOLD, U HERRMANN, R SCHMIDTBOCKING, H AF WOLFF, W WOLF, HE SHINPAUGH, JL WANG, J OLSON, RE FAINSTEIN, PD LENCINAS, S BECHTHOLD, U HERRMANN, R SCHMIDTBOCKING, H TI IONIC CHARGE DEPENDENCE OF THE ZERO DEGREE BINARY ENCOUNTER PEAK FOR PARTIALLY STRIPPED HEAVY-IONS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID EJECTED-ELECTRON SPECTRA; ATOM COLLISIONS; MULTICHARGED IONS; HE TARGETS; IONIZATION; IMPACT; PROJECTILES; EMISSION; HELIUM; INTERMEDIATE AB We report on the measurements of double differential cross sections, at zero degree, for the production of secondary electrons from the collision of 0.6 MeV amu(-1) Cu5+, I7+, Au11+, U13+, Cu19+, I23+ and Au29+ projectiles with H-2 and He. The shapes ad positions of the observed binary encounter electron peaks are compared with continuum distorted wave-eikonal initial state (CDW-EIS), impulse approximation and classical trajectory Monte Carlo calculations, as well as with predictions From an adiabatic resonant tunnelling model recently proposed by Fainstein and co-workers. The experimentally observed binary peak positions were found to be essentially determined by the projectile's ionic charge q and to be independent of the projectile's nuclear charge Z(P). Although the experimental conditions correspond to the strong perturbation regime, i.e. 1.0 less than or equal to q/V-P less than or equal to 5.9 (V-P being the projectile velocity), the CDW-EIS approach accounts well for the position and shape of the binary peak. C1 UNIV FED RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV MISSOURI,DEPT PHYS,ROLLA,MO 65401. CTR ATOM BARILOCHE,RA-8400 BARILOCHE,RIO NEGRO,ARGENTINA. INST BALSEIRO,RA-8400 BARILOCHE,RIO NEGRO,ARGENTINA. RP WOLFF, W (reprint author), UNIV FRANKFURT,INST KERNPHYS,W-6000 FRANKFURT,GERMANY. RI Wolff, Wania/O-5556-2015 NR 27 TC 7 Z9 7 U1 0 U2 2 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 NOV 28 PY 1993 VL 26 IS 22 BP 4169 EP 4180 DI 10.1088/0953-4075/26/22/022 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MK412 UT WOS:A1993MK41200022 ER PT J AU PEGG, DJ TANG, CY DELLWO, J ALTON, GD AF PEGG, DJ TANG, CY DELLWO, J ALTON, GD TI ANGULAR-DISTRIBUTION OF ELECTRONS PHOTODETACHED FROM THE EXCITED NEGATIVE-ION OF CARBON SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter AB A crossed beam technique has been used to investigate the angular distribution of electrons photodetached from the weakly-bound excited (2p(3))D-2 State of the C- ion via the (2p(2)) P-3 epsilon s,d channels. At a photon energy of 2.076 eV the asymmetry parameter was measured to be 0.38 +/- 0.05. No theoretical predictions are currently available. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP PEGG, DJ (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 8 TC 12 Z9 12 U1 1 U2 2 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 NOV 28 PY 1993 VL 26 IS 22 BP L789 EP L792 DI 10.1088/0953-4075/26/22/003 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MK412 UT WOS:A1993MK41200003 ER PT J AU KNOCHENMUSS, R HOLTOM, GR RAY, D AF KNOCHENMUSS, R HOLTOM, GR RAY, D TI PROTON-TRANSFER REACTION-RATES AS A PROBE OF SIZE-DEPENDENT PROPERTIES OF LARGE WATER CLUSTERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID GAS-PHASE CLUSTERS; SOLVATION DYNAMICS; EXCITED-STATE; STOCKMAYER FLUID; ION-PAIR; SOLVENT; 1-NAPHTHOL; PICOSECOND; ALPHA-NAPHTHOL.(NH3)N; ACETONITRILE AB Solvent-controlled excited state intermolecular proton transfer kinetics in 1-naphthol . (H2O)n (n less-than-or-equal-to 800), clusters were observed by picosecond time-resolved fluorescence in a molecular beam. Fast ( < 60 ps) and slow (0.5-1.5 ns) components of the naphtholate product fluorescence appearance were observed. The slower component decreased in rate with increasing cluster size; the time scale is much slower than for relaxation in bulk liquid water. The occurrence of the proton transfer reaction indicates liquid-like fluxionality of the water clusters in spite of their low temperature, RP KNOCHENMUSS, R (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999,K2-14, RICHLAND, WA 99352 USA. NR 36 TC 41 Z9 41 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 26 PY 1993 VL 215 IS 1-3 BP 188 EP 192 DI 10.1016/0009-2614(93)89286-Q PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MJ422 UT WOS:A1993MJ42200034 ER PT J AU AKERS, WT GROVE, M HARRISON, TM RYERSON, FJ AF AKERS, WT GROVE, M HARRISON, TM RYERSON, FJ TI THE INSTABILITY OF RHABDOPHANE AND ITS UNIMPORTANCE IN MONAZITE PARAGENESIS SO CHEMICAL GEOLOGY LA English DT Article; Proceedings Paper CT Session on Geochemistry of Accessory Minerals as part of the 3rd V M Goldschmidt Conference CY MAY 08-10, 1992 CL RESTON, VA SP GEOCHEM SOC, ASSOC EXPLORAT GEOCHEMISTS, AMER CHEM SOC, DIV GEOCHEM, EUROPEAN ASSOC GEOCHEM, GEOCHEM SOC JAPAN, INT ASSOC GEOCHEM & COSMOCHEM, SOC ENVIRONM GEOCHEM & HLTH, US GEOL SURVEY ID FELSIC MAGMAS; PB; SOLUBILITY; SHEAR; CHINA; BELT AB The high retentivity of monazite for Pb, its high U and Th concentrations, and its emergence in staurolite-zone metapelites suggests its use as a prograde thermochronometer. However, the monazite-producing reactions in pelites are as yet incompletely understood. We have investigated by experiment the suggestion that rhabdophane (LREEPO(4).nH(2)O) should be considered as an important reactant in monazite-producing reactions in pelitic compositions. Results of our combined hydrothermal and 1-bar heating experiments preclude rhabdophane from being the immediate precursor to neoformed monazite in lower amphibolite-facies metamorphic sequences and restrict rhabdophane occurrence to the uppermost portion of the crust. Dehydration of rhabdophane to form monazite appears to occur in a manner that may be analogous to the dehydration equilibria of zeolite minerals. Dry, 1-bar heating experiments indicate that La-rhabdophane persists (metastably?) to temperatures approaching 500 degrees C. XRD and visible-near-infrared spectroscopy examination of La-rhabdophane heated isothermally in air at temperatures ranging from 200 degrees to 700 degrees C indicate that structural water is largely retained up to 500 degrees C over heating intervals of up to 24 hr. Structural modifications involving H2O appear to take place between 300 degrees and 500 degrees C. Partial decomposition of La-rhabdophane to La-monazite is observed at 600 degrees C while rapid and complete reaction to La-monazite occurs at 700 degrees C. Experiments conducted under elevated water pressure (0.5-2 kbar) at temperatures between 200 degrees and 600 degrees C have not encountered conditions under which rhabdophane is stable relative to La-monazite+H2O, The low rhabdophane dehydration temperatures relative to the temperatures inferred for monazite formation in metapelites indicate that rhabdophane does not convert directly to monazite during pelite metamorphism. Rather, the ''monazite LREE component'' produced by rhabdophane breakdown must be incorporated in intermediate phases such as allanite and, perhaps more likely, LREE-oxides prior to monazite formation. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP AKERS, WT (reprint author), UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024, USA. RI Harrison, Timothy/E-7443-2012 NR 35 TC 29 Z9 29 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD NOV 25 PY 1993 VL 110 IS 1-3 BP 169 EP 176 DI 10.1016/0009-2541(93)90252-E PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MR702 UT WOS:A1993MR70200010 ER PT J AU WATSON, EB HARRISON, TM MILLER, CF RYERSON, FJ AF WATSON, EB HARRISON, TM MILLER, CF RYERSON, FJ TI SPECIAL ISSUE - GEOCHEMISTRY OF ACCESSORY MINERALS - PREFACE SO CHEMICAL GEOLOGY LA English DT Editorial Material C1 UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. VANDERBILT UNIV,DEPT GEOL,NASHVILLE,TN 37235. LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. RP WATSON, EB (reprint author), RENSSELAER POLYTECH INST,DEPT EARTH & ENVIRONM SCI,TROY,NY 12180, USA. RI Harrison, Timothy/E-7443-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD NOV 25 PY 1993 VL 110 IS 1-3 BP R6 EP R7 DI 10.1016/0009-2541(93)90243-C PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MR702 UT WOS:A1993MR70200001 ER PT J AU FELDMAN, WC BOYNTON, WV JAKOSKY, BM MELLON, MT AF FELDMAN, WC BOYNTON, WV JAKOSKY, BM MELLON, MT TI REDISTRIBUTION OF SUBSURFACE NEUTRONS CAUSED BY GROUND ICE ON MARS SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID HYDROGEN CONTENT; SPECTRA AB As part of an ongoing effort to understand data that will be returned by the Mars Observer Gamma Ray Spectrometer (MOGRS) experiment, we calculate neutron and gamma ray fluxes for simple models describing near-surface ground ice on Mars. Our goal is to determine the limits in information content of remotely sensed neutrons and gamma rays in delineating the abundance of ground ice and its distribution with depth. Such ice is expected based on simple theoretical calculations of the H2O environment of the martian surface and atmosphere. We find it produces a marked redistribution of neutrons with depth. Neutron-capture gamma ray production closely follows the flux of thermal neutrons and is likewise redistributed with depth. Calculated effects at Mars mapping orbit are sufficiently large that, if ice is present at the depths and in the quantities expected, the MOGRS should provide a robust detection of its presence. Although the information content of gamma rays and neutrons alone is not sufficient to define the many parameters needed to specify its abundance and emplacement below the surface, their combined use might allow separation of the ice abundance from its vertical distribution within the regolith. C1 UNIV COLORADO,DEPT ASTROPHYS PLANETARY & ATMOSPHER SCI,ATMOSPHER & SPACE PHYS LAB,BOULDER,CO 80309. UNIV COLORADO,DEPT GEOL SCI,ATMOSPHER & SPACE PHYS LAB,BOULDER,CO 80309. UNIV ARIZONA,DEPT PLANETARY SCI,LUNAR & PLANETARY LAB,TUCSON,AZ 85718. RP FELDMAN, WC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Mellon, Michael/C-3456-2016 NR 24 TC 33 Z9 33 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-PLANET JI J. Geophys. Res.-Planets PD NOV 25 PY 1993 VL 98 IS E11 BP 20855 EP 20870 DI 10.1029/93JE02325 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MJ713 UT WOS:A1993MJ71300004 ER PT J AU PITTMAN, RM BELL, AT AF PITTMAN, RM BELL, AT TI RAMAN STUDIES OF THE STRUCTURE OF NB2O5/TIO2 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NIOBIUM OXIDE CATALYSTS; MOLECULAR-STRUCTURES; VANADIUM-OXIDE; SILICA; DEHYDROGENATION; CHEMISTRY; SUPPORT; FILMS AB The structure of titania-supported niobia has been investigated by means of Raman spectroscopy. Well-dispersed monomeric and oligomeric species are observed at low Nb loadings corresponding to 0.13 of a theoretical Nb2O5 monolayer, whereas amorphous islands of Nb2O5 are the dominant species at Nb loadings corresponding to >0.5 of a theoretical Nb2O5 monolayer. Water vapor coordinates reversibly with Nb=O groups at the surface of the dispersed niobia, through the formation of Lewis acid-base adducts. The Nb-O-Nb bonds in the oligomeric species appear to undergo hydrolysis upon H2O exposure unlike the Nb-O-Nb bonds in the amorphous Nb2O5 islands, most of which are in the bulk of the oxide and, hence, less accessible to interaction with H2O. Calcination between 500 and 700-degrees-C does not affect the structure of the supported Nb2O5 although some of the amorphous Nb2O5 is transformed into T-Nb2O5. It is proposed that the amorphous Nb2O5 is stabilized on the surface of TiO2 by the formation of Ti-O-Nb linkages. The dispersed Nb2O5 is found to stabilize the transformation of the TiO2 support from anatase to rutile and the coincident loss in surface area of the support. Further calcination to 800 and 950-degrees-C results in the formation of TiNb2O7. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 44 TC 58 Z9 58 U1 4 U2 41 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 NOV 25 PY 1993 VL 97 IS 47 BP 12178 EP 12185 DI 10.1021/j100149a013 PG 8 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900013 ER PT J AU BAKAC, A ESPENSON, JH AF BAKAC, A ESPENSON, JH TI ELECTRON-TRANSFER AND ENERGY-TRANSFER QUENCHING OF EXCITED-STATE CHROMIUM(III) CYCLAM COMPLEXES AND REDOX REACTIONS OF THE CHROMIUM(II) PRODUCT SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TRANS-DIAMMINE(1,4,8,11-TETRAAZACYCLOTETRADECANE)CHROMIUM(III); PHOTOBEHAVIOR; PERCHLORATE; IONS AB The 2E excited states trans-[*Cr([14]aneN4)(NH3)2]3+ and trans-[*Cr([14]aneN4)(CN)2]+ oxidize methyl viologen radical cation, MV+, in D2O with rate constants k = 1.09 x 10(9) M-1 s-1 and 3.10 x 10(9) M-1 s-1, respectively, at 298 K and 0.050 M ionic strength. The initial chromium(II) products rapidly aquate to yield trans-[Cr([14]aneN4)(H2O)2]2+, which reduces MV2+ back to MV+. This reaction is strongly catalyzed by coordinating anions Cl-, Br-, and SCN-. For X = Cl and Br, the final chromium product is trans-Cr([14]aneN4)(H2O)(X)]2+. The kinetics obey a mixed third-order rate law, k(obs) = k(x)[MV2+] [trans-Cr-([14]aneN4)(H2O)22+][X-1, with k(Cl) = 4.65 x 10(5) M-2 s-1 and k(Br) = 5.22 x 10(5) M-2 s-1 at 298 K and 0.25 M ionic strength. The SCN--catalyzed reaction has a more complex rate law and yields trans-[Cr([14]aneN4)-(NCS)2]+ (NCS)2]+ as the chromium product implying trans-[Cr([14]aneN4)(NCS)2] as the sole kinetically important form of chromium(II). The quenching of trans-[*Cr([14]aneN4)(CN)2]+ by Cr(H2O)62+ (k = 5.23 x 10(7) M-1 s-1), V(H2O)62+ (k = 2.08 X 10(7)), and VO(H2O)52+ (k = 4.54 X 10(6)) takes place by energy transfer. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP BAKAC, A (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 20 TC 6 Z9 6 U1 1 U2 3 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 NOV 25 PY 1993 VL 97 IS 47 BP 12249 EP 12253 DI 10.1021/j100149a026 PG 5 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900026 ER PT J AU ZHANG, J FULTON, JL SMITH, RD AF ZHANG, J FULTON, JL SMITH, RD TI A LUMINESCENCE QUENCHING STUDY OF A PERCOLATION TRANSITION IN A PROPANE DIDODECYLDIMETHYLAMMONIUM BROMIDE WATER MICROEMULSION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID IN-OIL MICROEMULSIONS; ANGLE NEUTRON-SCATTERING; CHARGE FLUCTUATION MODEL; NEAR-CRITICAL PROPANE; REVERSE MICELLES; PHASE-BEHAVIOR; EXCITED-STATES; 3-COMPONENT MICROEMULSIONS; PHOTOPHYSICAL PROPERTIES; TEMPERATURE-DEPENDENCE AB Luminescence quenching was used to explore the interdroplet exchange processes for a propane/didodecyldimethylammonium bromide/water microemulsion at a dispersed-phase volume fraction of 0.30. This system shows a percolation type of transition in electrical conductivity as the pressure of the liquid solution is reduced from 450 to 100 bar at 26.5-degrees-C. Luminescence quenching results are consistent with a system of roughly spherical droplets, with size unaffected by the density of the continuous-phase solvent. However, the intermicellar exchange rate for the quencher is increased by a factor of 3 in the percolation regime. Only part of the increased exchange rate can be attributed to the decrease in the viscosity of the lower density propane, whereas the remainder is attributed to a clustering of the droplets resulting in more effective exchange. Lower propane density increases the strength of attractive interactions between the droplets, leading to extensive clustering and eventual electrical percolation. These results also confirm previous observations indicating that simply altering the strength of interdroplet interactions can induce electrical conductivity percolation. The observed behavior may be related to the early stages of a structural transition to a bicontinuous microemulsion that is believed to occur at higher volume fractions of the dispersed phase. These results also provide important new insights relevant to separation and reaction processes in near-critical microemulsion systems. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 83 TC 15 Z9 15 U1 0 U2 3 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 NOV 25 PY 1993 VL 97 IS 47 BP 12331 EP 12338 DI 10.1021/j100149a038 PG 8 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900038 ER PT J AU BAES, CF REARDON, EJ MOYER, BA AF BAES, CF REARDON, EJ MOYER, BA TI ION-INTERACTION MODEL APPLIED TO THE CUSO4-H2SO4-H2O SYSTEM AT 25-DEGREES-C SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID EQUILIBRIA; THERMODYNAMICS; ELECTROLYTES; CUSO4 AB The modeling of aqueous mixtures of a bivalent metal sulfate and sulfuric acid according to the treatment of Pitzer is complicated by the formation of bisulfate ion and by the need to include the effects of unsymmetrical mixing of ions of like but unequal charge. Because of the economic importance of the recovery of copper by the leaching of its ores with sulfuric acid, it is especially important to improve estimates of Pitzer parameters for the CuSO4-H2SO4-H2O system. Accordingly, we have applied the Pitzer treatment to available osmotic, solubility, and emf data for this system, with inclusion of unsymmetrical mixing effects. We employed published parameters for the H2SO4-H2O system and evaluated literature data to obtain parameters for the CuSO4-H2O system. The best fits to the data for mixtures were given by parameter sets that, in addition to beta(0)[Cu2+-HSO4-] and beta(1)[Cu2+-HSO4-], included at least one other parameter. The best choice of one was psi[Cu2+-H+HSO4-], and the best choice of two additional parameters was theta[Cu2+-H+] and psi[Cu2+-H+-HSO4-]. The resulting mean activity coefficient (gamma +/-) of CuSO4 at trace concentrations shows a dependence on sulfuric acid concentration quite similar to that found previously for FeSO4 and for NiSO4. For such solutions, predicted values of the quotient (gamma +/-2) CuSO4/(gamma +/-3)H2SO4, a measure of the extractability of copper, are in reasonably good agreement with a previous prediction based on the extraction of Cu(II) by didodecylnaphthalenesulfonic acid in toluene. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. UNIV WATERLOO,DEPT EARTH SCI,WATERLOO N2L 3G1,ONTARIO,CANADA. RI Solominow, Sonia/A-4021-2008; Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 NR 26 TC 15 Z9 15 U1 0 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 NOV 25 PY 1993 VL 97 IS 47 BP 12343 EP 12348 DI 10.1021/j100149a040 PG 6 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900040 ER PT J AU SAVIKHIN, S TAO, NG SONG, PS STRUVE, WS AF SAVIKHIN, S TAO, NG SONG, PS STRUVE, WS TI ULTRAFAST PUMP-PROBE SPECTROSCOPY OF THE PHOTORECEPTOR STENTORINS FROM THE CILIATE STENTOR-COERULEUS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HYPERICIN AB Polarized absorption difference profiles have been obtained with 3-6-ps resolution between 565 and 630 nm for the chromoproteins stentorin I and stentorin II, isolated from the protozoan ciliate Stentor coeruleus. Control experiments were performed on hypericin and on the stentorin chromophore in methanol. The isotropic decays of stentorin I and the stentorin chromophore are dominated by components with lifetimes conservatively longer than 1 ns. Stentorin I, the stentorin chromophore, and hypericin all develop, within <5 ps, an intense excited-state absorption band that is blue-shifted from and polarized essentially perpendicular to the main long-wavelength absorption band. The presence of this excited-state absorption band is signaled by the appearance of strongly wavelength-dependent initial anisotropies r(0), which assume large positive as well as negative values (>0.4 and <-0.2). To our knowledge, such anisotropies have not been reported in polarized pump-probe studies of rotational diffusion in solution or of energy-transfer kinetics in photosynthetic antennae. Hypericin itself exhibits 0.4-6-ps excited-state absorption decay kinetics, which are likely associated with intramolecular excited-state proton transfer. The corresponding proton transfers may be faster in stentorin I and in the stentorin chromophore. Stentorin II rapidly develops a unique absorption difference spectrum that lacks the excited-state absorption feature displayed by the other three systems. The ultrafast process in stentorin II (thought to be the active chromoprotein in ciliary motion) may be intermolecular proton transfer to an appropriately situated protein residue. The present experiments redefine the upper limit for the dominant lifetime component in this photoprocess to <3 ps. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. UNIV NEBRASKA, DEPT CHEM, LINCOLN, NE 68588 USA. UNIV NEBRASKA, INST CELLULAR & MOLEC BIOL, LINCOLN, NE 68588 USA. NR 19 TC 13 Z9 13 U1 1 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 NOV 25 PY 1993 VL 97 IS 47 BP 12379 EP 12386 DI 10.1021/j100149a045 PG 8 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900045 ER PT J AU BINDRA, KS RAMAYYA, AV MA, WC BABU, BRS HAMILTON, JH CHATURVEDI, L KORMICKI, J JANSSENS, RVF DAVIDS, CN AHMAD, I BEARDEN, IG CARPENTER, MP CHUNG, W HENDERSON, D HENRY, RG KHOO, TL LAURITSEN, T LIANG, Y PENTTILA, H SORAMEL, F BAKTASH, C NAZAREWICZ, W SHEIKH, JA AF BINDRA, KS RAMAYYA, AV MA, WC BABU, BRS HAMILTON, JH CHATURVEDI, L KORMICKI, J JANSSENS, RVF DAVIDS, CN AHMAD, I BEARDEN, IG CARPENTER, MP CHUNG, W HENDERSON, D HENRY, RG KHOO, TL LAURITSEN, T LIANG, Y PENTTILA, H SORAMEL, F BAKTASH, C NAZAREWICZ, W SHEIKH, JA TI IDENTIFICATION OF 183 HG - IDENTICAL BANDS IN 183,185 HG SO PHYSICS LETTERS B LA English DT Article ID EVEN-EVEN NUCLEI; SPIN AB In-beam gamma-ray transitions in 183Hg have been identified from fragment-gamma and gamma-gamma coincidence measurements using the Argonne Fragment Mass Analyzer (FMA). The gamma-ray transitions in 183Hg were placed into five bands. Two of these have been associated with the [624]9/2+ orbital and exhibit signature splitting, as expected for i13/2 excitations built on a prolate shape with moderate deformation. Two other bands which do not show signature splitting have been associated with the [514]7/2- orbital and exhibit transition energies ''identical'' to the bands with the same configuration in Hg-185. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV NOTRE DAME,S BEND,IN. UNIV MARYLAND,COLL PK,MD 20742. UNIV UDINE,DEPT PHYS,I-33100 UDINE,ITALY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. ORNL,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. RP BINDRA, KS (reprint author), VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235, USA. RI Penttila, Heikki/A-4420-2013; Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 24 TC 9 Z9 9 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 NOV 25 PY 1993 VL 318 IS 1 BP 41 EP 46 DI 10.1016/0370-2693(93)91781-H PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MH909 UT WOS:A1993MH90900009 ER PT J AU BRODSKY, SJ TANG, WK THORN, CB AF BRODSKY, SJ TANG, WK THORN, CB TI THE REGGEON TRAJECTORY IN EXCLUSIVE AND INCLUSIVE LARGE MOMENTUM-TRANSFER REACTIONS SO PHYSICS LETTERS B LA English DT Article ID QCD AB A fundamental prediction of perturbative QCD is that the Reggeon trajectories alpha(rho) (t) and alpha(A2) (t) governing charge exchange reactions at high energies s much greater than -t must monotonically approach zero at large spacelike momentum transfers. The asymptotic prediction lim-t-->infinity alpha(R)(t) = 0 reflects the fact that a weakly interacting quark-antiquark pair is exchanged in the t-channel. However, measurements of the inclusive processes pi-p --> pi0X at s congruent-to 300 GeV2 and 8 GeV2 > -t > 2 GeV2 indicate that the effective rho trajectory becomes negative at large -t. We resolve the apparent contradiction between the perturbative QCD predictions and the experimental data by showing that the hard QCD part of the trajectory is weakly coupled and that its contribution will be hidden until much higher energy. We also show that Reggeon contributions to exclusive and inclusive mesonic exchange hadron reactions can be systematically studied in perturbative QCD. In particular, the Reggeon contributions to the reaction pi-p --> pi0X and pi-p --> pi0n is discussed in detail. C1 UNIV FLORIDA,DEPT PHYS,INST FUNDAMENTAL THEORY,GAINESVILLE,FL 32611. RP BRODSKY, SJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. OI Thorn, Charles/0000-0002-2671-9799 NR 16 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 25 PY 1993 VL 318 IS 1 BP 203 EP 211 DI 10.1016/0370-2693(93)91807-Y PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MH909 UT WOS:A1993MH90900035 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DEFEZLASO, MDM DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P NEMECEK, S NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZANIN, M ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DEFEZLASO, MDM DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P NEMECEK, S NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZANIN, M ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G ZUNIGA, J TI PRODUCTION OF LAMBDA AND LAMBDA(LAMBDA)OVER-BAR CORRELATIONS IN THE HADRONIC DECAYS OF THE Z(0) SO PHYSICS LETTERS B LA English DT Article ID E+E ANNIHILATION; BARYON AB An analysis of the production of the LAMBDA baryon in the hadronic decays of the Z0 is presented, based on about 993K multihadronic events collected by the DELPHI detector at LEP during 1991 and 1992. The differential cross section of the LAMBDA and the correlations between LAMBDA and LAMBDABAR produced in the same event are compared to current models, based both on string fragmentation and on cluster decay. The predictions of the string fragmentation model are found to give satisfactory agreements with the data, clearly better than those of the cluster model. 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. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,IN2P3,PHYS CORPUSCULAIRE,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. CTR RECH NUCL,IN2P3,CNRS,ULP,F-67037 STRASBOURG,FRANCE. NCSR,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,FZU,INST PHYS,DIV HIGH ENERGY PHYS,CS-18040 PRAGUE 8,CZECHOSLOVAKIA. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,IN2P3,INST SCI NUCL,CNRS,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. DUBNA JOINT NUCL RES INST,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,IN2P3,ACCELERATEUR LINEAIRE LAB,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,IN2P3,LPNHE,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,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. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,CS-18000 PRAGUE 8,CZECHOSLOVAKIA. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1003 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OVIEDO,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. CTR ETUDE SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,VALENCIA,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 GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA,14-1-O,P-1000 LISBON,PORTUGAL. RI Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; 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; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013 OI Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Vaz, Pedro/0000-0002-7186-2359; 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; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; 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; NR 20 TC 48 Z9 48 U1 0 U2 9 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 NOV 25 PY 1993 VL 318 IS 1 BP 249 EP 262 DI 10.1016/0370-2693(93)91815-5 PG 14 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MH909 UT WOS:A1993MH90900043 ER PT J AU GAO, Y BAI, G MERKLE, KL CHANG, HLM LAM, DJ AF GAO, Y BAI, G MERKLE, KL CHANG, HLM LAM, DJ TI EFFECTS OF SUBSTRATE ORIENTATION AND COOLING RATE ON MICROSTRUCTURE OF PBTIO3 THIN-FILMS GROWN BY METAL-ORGANIC CHEMICAL-VAPOR-DEPOSITION SO THIN SOLID FILMS LA English DT Article ID MOCVD AB PbTiO3 thin films grown on (001) MgO, (110) MgO and (111)-textured Au/(001)MgO by metal-organic chemical vapor deposition have been characterized by X-ray diffraction, transmission electron microscopy and high resolution electron microSCopy. PbTiO3 films deposited on (001) MgO under optimum conditions show a bilayer structure. The top layer of the films near the free surface is c axis oriented with (001)[100]PbTiO3 parallel-to (001)[100]MgO. The bottom layer of the films near the substrate is a axis oriented with (100)[001BAR]PbTiO3 parallel-to (001)[100]MgO. 90-degrees domains (or {101} twins) were observed only in the c-axis-oriented layers. The thickness of the a-axis-oriented layers depends on the cooling rate and film thickness. It was found that the thickness of the a-axis-oriented layers near the substrate decreases with decreasing cooling rate and/or increasing film thickness. PbTiO3 films deposited on (110) MgO, however, are single-layer epitaxial thin films with (101)[001]PbTiO3 parallel-to (110)[001]MgO. Highly (001)-textured PbTiO3 thin films were obtained on (111)-oriented Au/(001) MgO. This texture appears to be due to a number of small holes (< 1 mum) formed in the Au thin films during heating to the growth temperature. These holes seem to have acted as nucleation sites for (001)PbTiO3 on (001) MgO. Since the growth rate along {100} is much faster than along other directions for PbTiO3, the resultant films are highly c axis oriented. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP GAO, Y (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801, USA. NR 20 TC 14 Z9 14 U1 4 U2 7 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 25 PY 1993 VL 235 IS 1-2 BP 86 EP 95 DI 10.1016/0040-6090(93)90248-N PG 10 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MG457 UT WOS:A1993MG45700020 ER PT J AU COSMAN, M FIALA, R HINGERTY, BE LARYEA, A LEE, HM HARVEY, RG AMIN, S GEACINTOV, NE BROYDE, S PATEL, D AF COSMAN, M FIALA, R HINGERTY, BE LARYEA, A LEE, HM HARVEY, RG AMIN, S GEACINTOV, NE BROYDE, S PATEL, D TI SOLUTION CONFORMATION OF THE (+)-TRANS-ANTI-[BPH]DA ADDUCT OPPOSITE DT IN A DNA DUPLEX - INTERCALATION OF THE COVALENTLY ATTACHED BENZO[C]PHENANTHRENE TO THE 5'-SIDE OF THE ADDUCT SITE WITHOUT DISRUPTION OF THE MODIFIED BASE-PAIR SO BIOCHEMISTRY LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; DIHYDRODIOL EPOXIDE; DIOL EPOXIDE; B-DNA; 3,4-DIOL-1,2-EPOXIDES; BENZO(C)PHENANTHRENE; SPECIFICITY; CARCINOGEN; ENANTIOMERS; DODECAMER AB Benzo[c]phenanthrene diol epoxide can covalently bind to the exocyclic amino group of deoxyadenosine to generate [BPh]dA adducts where the polycyclic aromatic hydrocarbon is attached to the major groove edge of DNA. This paper reports on NMR-energy minimization structural studies of the (+)-trans-anti-[BPh]dA adduct positioned opposite dT in the sequence context d(C5-[BPh]A6-C7).d-(G16-T17-G18) at the 11-mer duplex level. The exchangeable and nonexchangeable protons of the benzo-[c]phenanthrenyl moiety and the nucleic acid were assigned following analysis of two-dimensional NMR data sets in H2O and D2O Solution. The solution structure of the (+)-trans-anti-[BPh]dA.dT 11-mer duplex has been determined by incorporating intramolecular and intermolecular proton-proton distances defined by upper and lower bounds deduced from NOESY data sets as restraints in energy minimization computations. The covalently attached benzo[c]phenanthrene ring intercalates to the 5'-side of the [BPh]-dA6 lesion site without disruption of the flanking Watson-Crick dC5.dG18 and [BPh]dA6.dT17 base pairs. The observed buckling of the intercalation cavity reflects the selective overlap of the intercalated phenanthrenyl ring with dT17 and dG18 bases on the unmodified strand. The structure provides new insights into how a polycyclic aromatic hydrocarbon covalently attached to the major groove edge of deoxyadenosine can still unidirectionally intercalate in to the helix without disruption of the modified base pair. Our study establishes that among the contributing factors are a propeller-twisted [BPh]dA6.dT17 base pair, displacement of the carcinogen-DNA linkage bond from the plane of the dA6 base, the specific pucker adopted by the benzylic ring, and the propeller-like nonplanar geometry for the aromatic phenanthrenyl ring system. Our combined experimental-computational studies to date have now identified three structural motifs adopted by covalent polycyclic aromatic hydrocarbon-DNA adducts with their distribution determined by the chiral characteristics of individual stereoisomers and by whether the covalent adducts are generated at the minor or the major groove edge of the helix. C1 MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,1275 YORK AVE,NEW YORK,NY 10021. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. NYU,DEPT BIOL,NEW YORK,NY 10003. NYU,DEPT CHEM,NEW YORK,NY 10003. UNIV CHICAGO,BEN MAY INST,CHICAGO,IL 60637. AMER HLTH FDN,VALHALLA,NY 10595. FU NCI NIH HHS [CA-46533, CA-20851, CA-21111] NR 42 TC 97 Z9 97 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 NOV 23 PY 1993 VL 32 IS 46 BP 12488 EP 12497 DI 10.1021/bi00097a029 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MH746 UT WOS:A1993MH74600029 PM 8241140 ER PT J AU HEBNER, GA SHON, JW KUSHNER, MJ AF HEBNER, GA SHON, JW KUSHNER, MJ TI TEMPERATURE-DEPENDENT GAIN OF THE ATOMIC XENON LASER SO APPLIED PHYSICS LETTERS LA English DT Article AB Measured and calculated gain of the 1.73 mum [5d(3/2)1-6p(5/2)2] and 2.03 mum [5d(3/2)1-6p(3/2)1] atomic xenon transitions for gas temperatures between 290 and 590 K are presented. Fission-fragment excitation was used to generate the gain in Ar/Xe, He/Ar/Xe, and Ne/Ar/Xe gas mixtures at a pump power of 8 W/cm3. For constant gas density, the gain exhibits an approximate T(gas)-n dependence with n between 2 and 3. The primary reactions responsible for the temperature dependence of the gain have been identified as dimer formation, dissociative recombination, and enhanced electron collisional mixing of the laser manifold due to an increased electron density. C1 UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801. RP HEBNER, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Kushner, Mark/A-7362-2008; Kushner, Mark/D-4547-2015 NR 7 TC 8 Z9 8 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 NOV 22 PY 1993 VL 63 IS 21 BP 2872 EP 2874 DI 10.1063/1.110310 PG 3 WC Physics, Applied SC Physics GA MJ162 UT WOS:A1993MJ16200006 ER PT J AU DEVINE, RAB MATHIOT, D WARREN, WL FLEETWOOD, DM ASPAR, B AF DEVINE, RAB MATHIOT, D WARREN, WL FLEETWOOD, DM ASPAR, B TI POINT-DEFECT GENERATION DURING HIGH-TEMPERATURE ANNEALING OF THE SI-SIO2 INTERFACE SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON; SIO2; OXYGEN; DECOMPOSITION; DIFFUSIVITY; KINETICS; CENTERS AB Spectroscopic identification of the microscopic defects responsible for annealing induced degradation of the oxide in Si/SiO2/Si structures is presented. Hole injection or x irradiation reveals the presence of oxygen-vacancy centers and oxygen-vacancy center/Si interstitial complexes in the oxide following annealing. O related donors in the Si substrate are also present. These defects result from the diffusion of O from the SiO2 network into the Si; the primary driving force for O diffusion is the difference in the chemical potential of the O in the two phases. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. CEN,DTA,LETI,F-38041 GRENOBLE,FRANCE. RP DEVINE, RAB (reprint author), FRANCE TELECOM,CTR NATL ETUDES TELECOMMUN,BP 98,F-38243 MEYLAN,FRANCE. RI MATHIOT, Daniel/E-7629-2010 OI MATHIOT, Daniel/0000-0003-2845-3776 NR 15 TC 74 Z9 75 U1 2 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 NOV 22 PY 1993 VL 63 IS 21 BP 2926 EP 2928 DI 10.1063/1.110275 PG 3 WC Physics, Applied SC Physics GA MJ162 UT WOS:A1993MJ16200024 ER PT J AU MEARS, CA LABOV, SE BARFKNECHT, AT AF MEARS, CA LABOV, SE BARFKNECHT, AT TI ENERGY-RESOLVING SUPERCONDUCTING X-RAY-DETECTORS WITH CHARGE AMPLIFICATION DUE TO MULTIPLE QUASI-PARTICLE TUNNELING SO APPLIED PHYSICS LETTERS LA English DT Article ID RESOLUTION; JUNCTIONS AB Superconducting tunnel junctions coupled to superconducting absorbers may be used as high-resolution, high-efficiency x-ray spectrometers. We have tested devices with niobium x-ray absorbing layers coupled to aluminum layers that serve as quasiparticle traps. The energy resolution at 6 keV was 49 eV full width at half-maximum. We estimate that each quasiparticle tunnels an average of 19 times before recombining, increasing the total charge transferred and therefore decreasing the effects of electronic noise. C1 CONDUCTUS INC,SUNNYVALE,CA 94086. RP MEARS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,POB 808,L-401,LIVERMORE,CA 94550, USA. NR 12 TC 91 Z9 92 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 NOV 22 PY 1993 VL 63 IS 21 BP 2961 EP 2963 DI 10.1063/1.110286 PG 3 WC Physics, Applied SC Physics GA MJ162 UT WOS:A1993MJ16200036 ER PT J AU SOMORJAI, GA AF SOMORJAI, GA TI HETEROGENEOUS CATALYSIS - FUTURE OPPORTUNITIES IN A HISTORICAL-PERSPECTIVE SO CATALYSIS TODAY LA English DT Article C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP SOMORJAI, GA (reprint author), LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720, USA. NR 4 TC 3 Z9 3 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD NOV 22 PY 1993 VL 18 IS 2 BP 113 EP 123 DI 10.1016/0920-5861(93)85026-V PG 11 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA MK684 UT WOS:A1993MK68400002 ER PT J AU LIBURDY, RP CALLAHAN, DE HARLAND, J DUNHAM, E SLOMA, TR YASWEN, P AF LIBURDY, RP CALLAHAN, DE HARLAND, J DUNHAM, E SLOMA, TR YASWEN, P TI EXPERIMENTAL-EVIDENCE FOR 60-HZ MAGNETIC-FIELDS OPERATING THROUGH THE SIGNAL-TRANSDUCTION CASCADE - EFFECTS ON CALCIUM INFLUX AND C-MYC MESSENGER-RNA INDUCTION SO FEBS LETTERS LA English DT Article DE SIGNAL TRANSDUCTION; ONCOGENE; C-MYC MESSENGER RNA; CALCIUM TRANSPORT; EXTREMELY-LOW-FREQUENCY (ELF) ELECTRIC AND MAGNETIC FIELD ID BRAIN-TISSUE INVITRO; LOW-FREQUENCY; ELECTROMAGNETIC-FIELDS; BIOLOGICAL INTERACTIONS; ELECTRIC-FIELDS; LYMPHOCYTES; ACTIVATION; EXPOSURE; CELLS; SYSTEMS AB We tested the hypothesis that early alterations in calcium influx induced by an imposed 60 Hz magnetic field are propagated down the signal transduction (ST) cascade to alter c-MYC mRNA induction. To test this we measured both ST parameters in the same cells following 60 Hz magnetic field exposures in a specialized annular ring device (220 G (22 mT), 1.7 mV/cm maximal E(induced), 37-degrees-C, 60 min). Ca2+ influx is a very early ST marker that precedes the specific induction of mRNA transcripts for the proto-oncogene c-MYC, an immediate early response gene. In three experiments influx of Ca-45(2+) in the absence of mitogen was similar to that in cells treated with suboptimal levels of Con-A (1 mug/ml). However, calcium influx was elevated 1.5-fold when lymphocytes were exposed to Con-A plus magnetic fields; this co-stimulatory effect is consistent with previous reports from our laboratory [FEBS Lett. 301 (1992) 53-59; FEBS Lett. 271 (1990) 157-160; Ann. N.Y. Acad. Sci. 649 (1992) 74-95]. The level of c-MYC mRNA transcript copies in non-activated cells and in suboptimally-activated cells was also similar, which is consistent with the above calcium influx findings. Significantly, lymphocytes exposed to the combination of magnetic fields plus suboptimal Con-A responded with an approximate 3.0-fold increase in band intensity of c-MYC mRNA transcripts. Importantly, transcripts for the housekeeping gene GAPDH were not influenced by mitogen or magnetic fields. We also observed that lymphocytes that failed to exhibit increased calcium influx in response to magnetic fields plus Con-A, also failed to exhibit an increase in total copies of c-MYC mRNA. Thus, calcium influx and c-MYC mRNA expression, which are sequentially linked via the signal transduction cascade in contrast to GAPDH, were both increased by magnetic fields. These findings support the above ST hypothesis and provide experimental evidence for a general biological framework for understanding magnetic field interactions with the cell through signal transduction. In addition, these findings indicate that magnetic fields can act as a co-stimulus at suboptimal levels of mitogen; pronounced physiological changes in lymphocytes such as calcium influx and c-MYC mRNA induction were not triggered by a weak mitogenic signal unless accompanied by a magnetic field. Magnetic fields, thus, have the ability to potentiate or amplify cell signaling. RP LIBURDY, RP (reprint author), LAWRENCE BERKELEY LAB,DEPT CELL & MOLEC BIOL,DIV LIFE SCI,BERKELEY,CA 94720, USA. FU NCI NIH HHS [NCI CA53711] NR 33 TC 101 Z9 110 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD NOV 22 PY 1993 VL 334 IS 3 BP 301 EP 308 DI 10.1016/0014-5793(93)80699-U PG 8 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA MH650 UT WOS:A1993MH65000012 PM 8243637 ER PT J AU ANDREOZZI, F BRONDI, A DONOFRIO, A LARANA, G MORO, R PERILLO, E ROMANO, M TERRASI, F DAYRAS, R DUMONT, H GADI, F DELCAMPO, JG AF ANDREOZZI, F BRONDI, A DONOFRIO, A LARANA, G MORO, R PERILLO, E ROMANO, M TERRASI, F DAYRAS, R DUMONT, H GADI, F DELCAMPO, JG TI REACTION-MECHANISM EVOLUTION FOR THE SYSTEM NE-20+NI-60 AT INTERMEDIATE ENERGIES - FROM MASSIVE TRANSFER TO FRAGMENTATION SO NUCLEAR PHYSICS A LA English DT Article DE NI-60(NE-20, X); E = 1 GEV; MEASURED RESIDUE MASS; CHARGE DISTRIBUTIONS; ABSOLUTE-SIGMA; PROJECTED RANGES; ENRICHED TARGET; GEOMETRICAL MODEL CALCULATIONS ID MEV NUCLEON; C-12 IONS; TARGET RESIDUES; PROJECTILE-LIKE; 35 MEV/NUCLEON; COLLISIONS; COPPER AB Mass and charge distributions for heavy residues in the reaction Ne-20+Ni-60 at 50 MeV/nucleon were measured by in-beam and off-line gamma-ray spectrometry. The stacked foil method was used to obtain information about the distribution of the velocity component parallel to the beam direction for target-like residues. The comparison of the data to the predictions of a participant-spectator model indicates that an 8% width for the dissipated energy distribution accounts for the observed projected ranges. C1 IST NAZL FIS NUCL,I-80125 NAPLES,ITALY. CENS,DPHN BE,F-91191 GIF SUR YVETTE,FRANCE. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP ANDREOZZI, F (reprint author), UNIV FEDERICO II,DIPARTIMENTO SCI FIS,PAD 20 MOSTRA OLTREMARE,I-80125 NAPLES,ITALY. RI Gadi, Dayras/A-4646-2012 NR 28 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 22 PY 1993 VL 564 IS 3 BP 441 EP 452 DI 10.1016/0375-9474(93)90514-X PG 12 WC Physics, Nuclear SC Physics GA MJ581 UT WOS:A1993MJ58100007 ER PT J AU PHAIR, L BOWMAN, DR CARLIN, N GELBKE, CK GONG, WG KIM, YD LISA, MA LYNCH, WG PEASLEE, GF DESOUZA, RT TSANG, MB WILLIAMS, C ZHU, F COLONNA, N HANOLD, K MCMAHAN, MA WOZNIAK, GJ AF PHAIR, L BOWMAN, DR CARLIN, N GELBKE, CK GONG, WG KIM, YD LISA, MA LYNCH, WG PEASLEE, GF DESOUZA, RT TSANG, MB WILLIAMS, C ZHU, F COLONNA, N HANOLD, K MCMAHAN, MA WOZNIAK, GJ TI AZIMUTHAL CORRELATIONS AS A TEST FOR CENTRALITY IN HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article DE AU-197(AR-36,X); E=35-110 MEV NUCLEON; AU-197(XE-129,X); E=50 MEV NUCLEON; MEASURED (PARTICLE)(PARTICLE)(PHI); DEDUCED CENTRAL COLLISIONS SELECTIVITY FEATURES ID NUCLEUS-NUCLEUS COLLISIONS; E/A = 35; NONEQUILIBRIUM LIGHT PARTICLES; INTERMEDIATE-MASS FRAGMENTS; IMPACT PARAMETER; AR-36+AU-197 COLLISIONS; O-16-INDUCED REACTIONS; COLLECTIVE FLOW; REACTION PLANE; MEAN-FIELD AB Azimuthal correlations of particles emitted in collisions between Au-197 target nuclei and projectiles Ar-36 (at E/A = 35, 50, 80 and 110 MeV) and Xe-129 (at E/A = 50 MeV) have been measured with the MSU Miniball, a 4pi phoswich array with a low detection threshold. Various impact parameter filters, based on the charge-particle multiplicity, transverse energy and midrapidity charge are tested by their ability to suppress collective motion as measured by the azimuthal correlations. The usefulness of a directivity cut in selecting central collisions for these systems is evaluated. C1 MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720. RP PHAIR, L (reprint author), MICHIGAN STATE UNIV,CYCLOTRON LAB,E LANSING,MI 48824, USA. RI Carlin Filho, Nelson/C-2187-2012; Lynch, William/I-1447-2013; deSouza, Romualdo/P-5862-2015 OI Lynch, William/0000-0003-4503-176X; deSouza, Romualdo/0000-0001-5835-677X NR 36 TC 30 Z9 30 U1 1 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 NOV 22 PY 1993 VL 564 IS 3 BP 453 EP 472 DI 10.1016/0375-9474(93)90515-Y PG 20 WC Physics, Nuclear SC Physics GA MJ581 UT WOS:A1993MJ58100008 ER PT J AU MORELOS, A ALBUQUERQUE, IF BONDAR, NF CARRIGAN, RA CHEN, D COOPER, PS LISHENG, D DENISOV, AS DOBROVOLSKY, AV DUBBS, T ENDLER, AMF ESCOBAR, CO FOUCHER, M GOLOVTSOV, VL GOTTSCHALK, H GOUFFON, P GRACHEV, VT KHANZADEEV, AV KUBANTSEV, MA KUROPATKIN, NP LACH, J LANG, PF LI, CZ LI, YS LUKSYS, M MAHON, JRP MCCLIMENT, E NEWSOM, C MAIA, MCP SAMSONOV, VM SCHEGELSKY, VA SHI, HZ SMITH, VJ TANG, FK TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA YAN, J ZHAO, WH ZHENG, SC ZHONG, YY AF MORELOS, A ALBUQUERQUE, IF BONDAR, NF CARRIGAN, RA CHEN, D COOPER, PS LISHENG, D DENISOV, AS DOBROVOLSKY, AV DUBBS, T ENDLER, AMF ESCOBAR, CO FOUCHER, M GOLOVTSOV, VL GOTTSCHALK, H GOUFFON, P GRACHEV, VT KHANZADEEV, AV KUBANTSEV, MA KUROPATKIN, NP LACH, J LANG, PF LI, CZ LI, YS LUKSYS, M MAHON, JRP MCCLIMENT, E NEWSOM, C MAIA, MCP SAMSONOV, VM SCHEGELSKY, VA SHI, HZ SMITH, VJ TANG, FK TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA YAN, J ZHAO, WH ZHENG, SC ZHONG, YY TI MEASUREMENT OF THE MAGNETIC-MOMENTS OF THE SIGMA+ AND SIGMA-OVER-BAR-HYPERONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We have measured the magnetic moments of the SIGMA+ and SIGMABAR- hyperons produced by 800-GeV protons incident on a Cu target. We determine the SIGMA+ magnetic moment to be (2.4613 +/- 0.0034 +/- 0.0040)mu(N) where the uncertainties are statistical and systematic, respectively. In this first measurement we determine the magnetic moment of the SIGMABAR- to be -(2.428 +/- 0.036 +/- 0.007)mu(N). The magnetic moments of the SIGMA+ and SIGMABAR- are consistent with each other in magnitude but opposite in sign as required by CPT invariance. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. PETERSBURG NUCL PHYS INST,GATCHINA,RUSSIA. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. UNIV IOWA,IOWA CITY,IA 52242. YALE UNIV,JW GIBBS LAB,NEW HAVEN,CT 06511. INST THEORET & EXPTL PHYS,MOSCOW,RUSSIA. SUNY ALBANY,ALBANY,NY 12222. UNIV FED PARAIBA,PARAIBA,BRAZIL. CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. CONSELHO NACL PESQUISAS,CONSELHO NACL DESENVOLVIMENTO CIENT & TECNOL,BR-22290 RIO JANEIRO,RJ,BRAZIL. UNIV SAO PAULO,SAO PAULO,BRAZIL. RI Albuquerque, Ivone/H-4645-2012; Gouffon, Philippe/I-4549-2012 OI Albuquerque, Ivone/0000-0001-7328-0136; Gouffon, Philippe/0000-0001-7511-4115 NR 11 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 22 PY 1993 VL 71 IS 21 BP 3417 EP 3420 DI 10.1103/PhysRevLett.71.3417 PG 4 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500006 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ARETI, H AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BERETVAS, A BERGE, JP BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GALEOTTI, S GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J HENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, R KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LORETI, M LOW, EH LU, J LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MITSUSHIO, H MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OHL, KE OISHI, R OKUSAWA, T PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAFFAELI, F RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLESTRUP, A TONNISON, J TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ARETI, H AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BERETVAS, A BERGE, JP BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GALEOTTI, S GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J HENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, R KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LORETI, M LOW, EH LU, J LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MITSUSHIO, H MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OHL, KE OISHI, R OKUSAWA, T PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAFFAELI, F RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLESTRUP, A TONNISON, J TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF THE AVERAGE LIFETIME OF B-HADRONS PRODUCED IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID E+E ANNIHILATION; BOTTOM HADRONS; CROSS-SECTION; QUARKS; DECAYS; MESON AB The average b-hadron lifetime has been measured using a high statistics sample of B --> J/psi) X decays recorded with the Collider Detector at Fermilab. The decay vertices of 5344 inclusive J/psi --> mu+mu-candidates have been reconstructed using information from a silicon vertex detector. The measured B lifetime, which is the average over all b hadrons produced in ppBAR collisions at square-root s = 1.8 TeV weighted by their branching ratios into J/psi, is 1.46 +/- 0.06(stat) +/- 0.06(syst) ps. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27708. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. OSAKA CITY UNIV,OSAKA 588,JAPAN. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS UNIV,PISCATAWAY,NJ 08854. SUPERCOND SUPER COLLIDER LAB,DALLAS,TX 75237. TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RI Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; NR 42 TC 38 Z9 38 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 NOV 22 PY 1993 VL 71 IS 21 BP 3421 EP 3426 DI 10.1103/PhysRevLett.71.3421 PG 6 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500007 ER PT J AU GROVE, JW HOLMES, R SHARP, DH YANG, Y ZHANG, Q AF GROVE, JW HOLMES, R SHARP, DH YANG, Y ZHANG, Q TI QUANTITATIVE THEORY OF RICHTMYER-MESHKOV INSTABILITY SO PHYSICAL REVIEW LETTERS LA English DT Article ID STABILITY; FLUIDS AB The acceleration of a material interface by a shock wave generates an interface instability known as the Richtmyer-Meshkov instability. Previous attempts to model the growth rate of the instability have produced values that are almost twice that of the experimental measurements. This Letter presents numerical simulations using front tracking that for the first time are in quantitative agreement with experiments of a shocked air-SF6 interface. Moreover, the failure of the impulsive model, and the linear theory from which it is derived, to model experiments correctly is understood in terms of time limits on the validity of the linear model. C1 LOS ALAMOS NATL LAB, DIV THEORET, COMPLEX SYST GRP, LOS ALAMOS, NM 87545 USA. RP SUNY STONY BROOK, DEPT APPL MATH & STAT, STONY BROOK, NY 11794 USA. OI ZHANG, Qiang /0000-0002-8659-5396 NR 17 TC 56 Z9 59 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 22 PY 1993 VL 71 IS 21 BP 3473 EP 3476 DI 10.1103/PhysRevLett.71.3473 PG 4 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500020 ER PT J AU CLARK, NA BELLINI, T MALZBENDER, RM THOMAS, BN RAPPAPORT, AG MUZNY, CD SCHAEFER, DW HRUBESH, L AF CLARK, NA BELLINI, T MALZBENDER, RM THOMAS, BN RAPPAPORT, AG MUZNY, CD SCHAEFER, DW HRUBESH, L TI X-RAY-SCATTERING STUDY OF SMECTIC ORDERING IN A SILICA AEROGEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEMATIC PHASE-TRANSITION; CRITICAL-BEHAVIOR; A TRANSITION; OCTYLCYANOBIPHENYL 8CB; ELASTIC-CONSTANT; LIQUID-CRYSTALS; HEAT-CAPACITY; MODEL AB We have studied, via x-ray scattering, the nematic to smectic-A (NA) translational ordering of the liquid-crystal-forming compound octylcyanobiphenyl (8CB) incorporated into the pores of a silica aerogel. We find that the aerogel dramatically alters 8CB phase behavior, eliminating the NA transition found at T=T(NA)=33.7-degrees-C in bulk samples and replacing it by a short range smectic ordering having a correlation length which at T(NA) is xi is similar to 40 angstrom, much smaller than the aerogel pore and nematic domain size xi(p) is similar to 200 angstrom. As T is lowered this smectic disorder is eliminated from the pores, xi increasing continuously over a 20-degrees-C range to saturate at xi(p) for T < T(NA) -20-degrees-C. C1 UNIV PAVIA,DIPARTIMENTO ELETTR,I-27100 PAVIA,ITALY. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE LAB,LIVERMORE,CA 94551. RP CLARK, NA (reprint author), UNIV COLORADO,DEPT PHYS,CONDENSED MATTER LAB,BOULDER,CO 80309, USA. RI Clark, Noel/E-9011-2010; Bellini, Tommaso/M-5510-2014 OI Bellini, Tommaso/0000-0003-4898-4400 NR 22 TC 103 Z9 103 U1 1 U2 12 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 NOV 22 PY 1993 VL 71 IS 21 BP 3505 EP 3508 DI 10.1103/PhysRevLett.71.3505 PG 4 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500028 ER PT J AU BULAEVSKII, LN MALEY, MP AF BULAEVSKII, LN MALEY, MP TI LOW-TEMPERATURE SPECIFIC-HEAT OF THE VORTEX LATTICE IN LAYERED SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; II SUPERCONDUCTORS; PHASE-TRANSITION; MAGNETIC-FIELD; ANISOTROPY; FLUCTUATIONS; VORTICES; STATE; FILMS AB The contribution of the vortex fluctuations to the specific heat of the vortex lattice, C(v), in a highly anisotropic layered superconductor is calculated for the field B perpendicular to the layers in the interval H(c1) << B << H(c2). The model of the quantum overdamped oscillator for vortex vibrations is used to describe the dynamics of vortices at low temperatures. The specific heat C(v) (T, B) is linear in temperature at low T and increases with field, C(v) is-proportional-to ln B in the case of weak pinning and C(v) is-proportional-to B in the case of strong pinning. RP BULAEVSKII, LN (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 34 TC 30 Z9 30 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 NOV 22 PY 1993 VL 71 IS 21 BP 3541 EP 3544 DI 10.1103/PhysRevLett.71.3541 PG 4 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500037 ER PT J AU HWA, T LEDOUSSAL, P NELSON, DR VINOKUR, VM AF HWA, T LEDOUSSAL, P NELSON, DR VINOKUR, VM TI FLUX-PINNING AND FORCED VORTEX ENTANGLEMENT BY SPLAYED COLUMNAR DEFECTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSULATOR TRANSITION; BOSON LOCALIZATION; LIQUIDS; SUPERCONDUCTORS; CRYSTALS; DISORDER AB We propose controlled splay of artificial columnar defects in cuprate superconductors as a strategy to enhance transport properties in a field compared to parallel columns. The theory predicts a new ''splayed glass'' phase characterized by a reduced flux creep, an entangled ground state, and an astronomically slow response to an applied transverse field. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RUTGERS UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08855. RP HWA, T (reprint author), HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138, USA. RI Hwa, Terence/J-4012-2013 OI Hwa, Terence/0000-0003-1837-6842 NR 11 TC 163 Z9 164 U1 2 U2 9 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 NOV 22 PY 1993 VL 71 IS 21 BP 3545 EP 3548 DI 10.1103/PhysRevLett.71.3545 PG 4 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500038 ER PT J AU WU, RQ WANG, DS FREEMAN, AJ AF WU, RQ WANG, DS FREEMAN, AJ TI 1ST PRINCIPLES INVESTIGATION OF THE VALIDITY AND RANGE OF APPLICABILITY OF THE X-RAY MAGNETIC CIRCULAR-DICHROISM SUM-RULE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ABSORPTION; NICKEL; EDGES; IRON AB X-ray magnetic circular dichroism (MCD) spectra and orbital angular momentum, [L(z)], for transition metal bulk and surfaces were studied for both ground state and core hole excitations using a highly precise local density approach. For Fe(001), we predict a double peak structure in both the MCD and total absorption spectra and a strong enhancement of [L(z)]. Surprisingly, the MCD orbital sum rule is found to be valid to within (5-10)%. Finally, the results suggest possible solutions to several problems faced in applying the MCD sum rule to measure [L(z)]. C1 ACAD SINICA,INST PHYS,BEIJING 100080,PEOPLES R CHINA. ARGONNE NATL LAB,DIV MED SCI,ARGONNE,IL 60439. RP WU, RQ (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Wu, Ruqian/C-1395-2013 OI Wu, Ruqian/0000-0002-6156-7874 NR 19 TC 160 Z9 163 U1 1 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 22 PY 1993 VL 71 IS 21 BP 3581 EP 3584 DI 10.1103/PhysRevLett.71.3581 PG 4 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500047 ER PT J AU NEEDELS, M AF NEEDELS, M TI AB-INITIO TOTAL-ENERGY CALCULATIONS FOR EXTREMELY LARGE SYSTEMS - APPLICATION TO THE TAKAYANAGI RECONSTRUCTION OF SI(111) - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter RP NEEDELS, M (reprint author), UNIV CALIF LAWRENCE,LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 3 TC 6 Z9 6 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 NOV 22 PY 1993 VL 71 IS 21 BP 3612 EP 3612 DI 10.1103/PhysRevLett.71.3612 PG 1 WC Physics, Multidisciplinary SC Physics GA MH745 UT WOS:A1993MH74500058 ER PT J AU MEYER, A LYDEARD, C AF MEYER, A LYDEARD, C TI THE EVOLUTION OF COPULATORY ORGANS, INTERNAL FERTILIZATION, PLACENTAE AND VIVIPARITY IN KILLIFISHES (CYPRINODONTIFORMES) INFERRED FROM A DNA PHYLOGENY OF THE TYROSINE KINASE GENE X-SRC SO PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES LA English DT Article ID AMPLIFICATION; SEQUENCES; TESTIS; FISHES AB Cyprinodontiforms are a diverse group of approximately 900 pantropical and temperate fishes, mostly found in freshwater. Whereas the vast majority of fishes lay eggs (i.e. are oviparous), this group is unusual in that four groups of cyprinodont fishes give birth to living young (i.e. are viviparous). A molecular phylogenetic hypothesis was based on partial DNA sequences of the tyrosine kinase gene X-src. The study included the major lineages of fishes of the suborder Cyprinodontoidei, order Cyprinodontiformes. Our phylogeny agrees with some but not all of the conclusions of a previous morphological cladistic analysis (Parenti (Bull. Am. Mus. nat. Hist. 168, 335 (1981)). The differences are: (i) the Profundulidae are the sister group to the Goodeidae, not the sister group to all other cyprinodontoids; (ii) Fundulidae are the sister group to the Profundulidae and Goodeidae; (iii) Cubanichthys and the Cyprinodontinae might not be sister taxa; (iv) Cubanichthys, and not the Profundulidae, might be the most basal member of the cyprinodontoids; and (v) the Anablepinae and Poeciliinae might be sister groups. The molecular phylogeny was used to reconstruct the evolution of major life-history traits such as internal fertilization, copulatory organs, livebearing and placentas. Internal fertilization, modifications of the male's anal fin to form a copulatory organ, and viviparity probably evolved independently three times in cyprinodontiform fishes: in the subfamilies Goodeinae, Anablepinae and Poeciliinae (sensu Parenti 198 1). The evolution of bundled sperm, spermatozeugmata, is probably not a prerequisite for internal fertilization because at least one species with internal fertilization has free spermatozoa. Livebearing (viviparity), which takes the form of ovoviviparity (where embryos are nourished by their yolk sac only), evolved only in the subfamily Poeciliinae. Advanced forms of viviparity, in which the mother provides additional nourishment to the embryos through placenta-like structures, apparently evolved at least three times from egg-laying ancestors: in the subfamilies Goodeinae, Anablepinae, and more than once in the Poeciliinae. C1 UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. RP MEYER, A (reprint author), SUNY STONY BROOK, DEPT ECOL & EVOLUT, STONY BROOK, NY 11794 USA. RI Meyer, Axel/C-9826-2009 OI Meyer, Axel/0000-0002-0888-8193 NR 50 TC 67 Z9 70 U1 2 U2 11 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 0962-8452 EI 1471-2954 J9 P ROY SOC B-BIOL SCI JI Proc. R. Soc. B-Biol. Sci. PD NOV 22 PY 1993 VL 254 IS 1340 BP 153 EP 162 DI 10.1098/rspb.1993.0140 PG 10 WC Biology; Ecology; Evolutionary Biology SC Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology; Evolutionary Biology GA MJ473 UT WOS:A1993MJ47300012 PM 8290610 ER PT J AU SIEBER, M SMILANSKY, U CREAGH, SC LITTLEJOHN, RG AF SIEBER, M SMILANSKY, U CREAGH, SC LITTLEJOHN, RG TI NONGENERIC SPECTRAL STATISTICS IN THE QUANTIZED STADIUM BILLIARD SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID SYMMETRIES; ORBITS AB We consider the effect of a continuous family of neutral (bouncing ball) orbits on the energy spectrum of the quantized stadium billiard. Using a semiclassical approximation we derive analytic expressions for standard two-point spectral measures. The corrections due to the bouncing ball orbits account for some of the non-generic features observed in the analysis of the spectrum of a stadium cavity which was recently measured. Once the bouncing ball contributions are subtracted, the spectrum is shown to be well reproduced by the semi-classical trace formula based on unstable periodic orbits. We also study special patterns in the spectrum which are due to other non-generic features such as edge effects and 'whispering gallery' trajectories. C1 NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP SIEBER, M (reprint author), WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL. RI Sieber, Martin/F-1845-2010 OI Sieber, Martin/0000-0001-6725-1574 NR 17 TC 75 Z9 75 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD NOV 21 PY 1993 VL 26 IS 22 BP 6217 EP 6230 DI 10.1088/0305-4470/26/22/022 PG 14 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA MK406 UT WOS:A1993MK40600022 ER PT J AU BAU, R SCHWERDTFEGER, CJ GARLASCHELLI, L KOETZLE, TF AF BAU, R SCHWERDTFEGER, CJ GARLASCHELLI, L KOETZLE, TF TI NEUTRON-DIFFRACTION STUDY OF FAC-]IRH3(PPH2ME)3]CENTER-DOT-MEOH SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; X-RAY; SINGLE-CRYSTAL; POLYHYDRIDE COMPLEXES; IRIDIUM; DIHYDROGEN; HYDRIDE AB The structure of the methanol solvate of the facial isomer of [IrH3(PPh2Me)3] has been analysed by neutron diffraction. Data were obtained at 55 +/- 0.1 K using a single crystal of volume 17.6 mm3 and the structure refined to final agreement factors of R(F2) = 0.053 and R'(F2) = 0.064 for 1615 reflections. The Ir atom is situated on a three-fold rotation axis. Distances and angles correspond well to those expected for a complex with normal terminal H atoms: Ir-H 1.627(4). Ir-P 2.314(2) angstrom; H-Ir-H 83.4(2), P-Ir-P 98.6(l), and H-Ir-P 88.5(2). 169.1 (2)-degrees. As expected, the overall geometry of the complex is distorted octahedral, with the hydrogen ligands compressed together by the steric bulk of the phosphines, as evidenced by the H-Ir-H (< 90-degrees) and P-Ir-P (> 90-degrees) angles. The compound crystallizes in the rhombohedral space group R3, with a = 10.367(1) angstrom and alpha = 108.19(6)-degrees at T = 55 +/- 0.1 K. C1 UNIV MILAN,DIPARTIMENTO CHIM INORGAN & METALLORGAN,I-20133 MILAN,ITALY. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP BAU, R (reprint author), UNIV SO CALIF,DEPT CHEM,LOS ANGELES,CA 90089, USA. NR 38 TC 10 Z9 10 U1 0 U2 1 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0300-9246 J9 J CHEM SOC DALTON JI J. Chem. Soc.-Dalton Trans. PD NOV 21 PY 1993 IS 22 BP 3359 EP 3362 DI 10.1039/dt9930003359 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA MH691 UT WOS:A1993MH69100013 ER PT J AU BALBES, MJ BOYD, RN MATHEWS, GJ AF BALBES, MJ BOYD, RN MATHEWS, GJ TI THE PRIMORDIAL HELIUM ABUNDANCE AS DETERMINED FROM CHEMICAL EVOLUTION OF IRREGULAR GALAXIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, IRREGULAR; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID BIG-BANG NUCLEOSYNTHESIS; ELEMENTS AB In a previous study we explored the effects of Galactic chemical evolution on the determination of the primordial He-4 abundance, Y(P), from the zero metallicity intercept of the observed Y versus Z correlations. In the present paper we derive formulae in which one of the approximations made in that study is removed in the fit to the Y versus Z correlation data. We also investigate the effects on the Y(P) value of various approaches to fitting the data and find that a simultaneous fitting of all the data is the best approach to determining Y(P). We examine the recently suggested method of using N/O versus O/H as a means to determine the primary nitrogen abundance at low metallicity. As in the previous work it is found that the Y versus N/H data require a combination of primary and secondary nitrogen in all fits. We determine that Y(P) = 0.227 +/- 0.006 (1 sigma). This value is approximately 1.5 sigma below the minimum value allowed by the standard homogeneous big bang model with three light neutrino species. C1 OHIO STATE UNIV,DEPT ASTRON,COLUMBUS,OH 43210. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BALBES, MJ (reprint author), OHIO STATE UNIV,DEPT PHYS,174 W 18TH AVE,COLUMBUS,OH 43210, USA. NR 34 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1993 VL 418 IS 1 BP 229 EP 234 DI 10.1086/173384 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MF864 UT WOS:A1993MF86400021 ER PT J AU ULMER, A FENIMORE, EE EPSTEIN, RI HO, C KLEBESADEL, RW LAROS, JG DELGADO, F AF ULMER, A FENIMORE, EE EPSTEIN, RI HO, C KLEBESADEL, RW LAROS, JG DELGADO, F TI SOFT GAMMA-REPEATER 1806-20 - WEAK EVIDENCE FOR A PERIODICITY FOLLOWING THE BURSTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, BURSTS; STARS, INDIVIDUAL (SGR 1806-20); X-RAYS, STARS ID HIGH-ENERGY TRANSIENT; RAY BURST AB The study of soft gamma repeaters began with the detection of the soft gamma-ray burst of 1979 March 5 that was followed by long-lasting 8 s pulsations. Later weaker bursts were detected from the same source, although they did not exhibit detectable pulsations. Here we analyze data from the UCB/Los Alamos experiment on the International Cometary Explorer (ICE) of a different soft gamma repeater, SGR 1806-20. A search for periodicities in data following the bursts showed a signal at 2.8 s. The probability that a periodic signal of this size would occur by chance somewhere in the power spectrum is approximately 1.3%. The detected amplitude is approximately 25 times weaker than what would result if the SGR 1806-20 bursts were simply scaled-down replicas of the March 5th event. RP ULMER, A (reprint author), LOS ALAMOS NATL LAB,MS D436,LOS ALAMOS,NM 87545, USA. NR 11 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1993 VL 418 IS 1 BP 395 EP 397 DI 10.1086/173399 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MF864 UT WOS:A1993MF86400036 ER PT J AU MAYLE, RW TAVANI, M WILSON, JR AF MAYLE, RW TAVANI, M WILSON, JR TI PIONS, SUPERNOVAE, AND THE SUPRANUCLEAR MATTER DENSITY EQUATION OF STATE SO ASTROPHYSICAL JOURNAL LA English DT Article DE DENSE MATTER; ELEMENTARY PARTICLES; EQUATION OF STATE; SUPERNOVAE, GENERAL ID NUCLEAR-MATTER; COLLISIONS; ENERGY AB We discuss the general trends that result from including pions in the supranuclear matter density equation of state we use to evolve supernovae. Although we find the overall characteristics of the supernovae evolution largely unchanged, we do see in the supranuclear density region of a supernova core, the temperature and electron neutrino number density increasing by about 10% and 160%, respectively, over a similar calculation where pions are neglected. These changes increase the neutrino luminosity and thus increase the explosion energy. The explanation for this behavior, as well as a thorough discussion of pion model we use, are the main topics of this paper. C1 PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RP MAYLE, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. OI Tavani, Marco/0000-0003-2893-1459 NR 12 TC 26 Z9 26 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1993 VL 418 IS 1 BP 398 EP 404 DI 10.1086/173400 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MF864 UT WOS:A1993MF86400037 ER PT J AU KOPP, RA POLETTO, G AF KOPP, RA POLETTO, G TI CORONAL HEATING BY NANOFLARES - INDIVIDUAL EVENTS AND GLOBAL ENERGETICS SO ASTROPHYSICAL JOURNAL LA English DT Article ID TRANSITION REGION; SMM OBSERVATIONS; ALFVEN WAVES; SOLAR-FLARE; MICROFLARES; LOOPS; OSO-8; WIND; FLOW; IV AB Various mechanisms have been proposed to heat the solar corona, but none have been completely successful in accounting for its observed characteristics. Recently a further candidate has been advanced; namely, stochastic heating via a large number of tiny impulsive energy-release events, the so-called nanoflares. In this paper we develop a simple semianalytical model to describe the temporal evolution of the nanoflare plasma and to determine the response of magnetic flux tubes of different sizes to typical nanoflare energy releases. This allows us to show how the repeated occurrence of low-energy events in an originally cool loop may eventually build up a high-temperature plasma- a nanoflare-heated corona. We also calculate the average nanoflare rate of occurrence, as a function of loop size, required to keep the plasma at coronal temperatures. The collective effect of this minievent population is shown to account for the observed coronal temperature and global emission measure. The present estimates may be used as guidelines for defining the requisites of future experiments aimed at observationally testing the nanoflare heating hypothesis. C1 OSSERV ASTROFIS ARCETRI, I-50125 FLORENCE, ITALY. RP LOS ALAMOS NATL LAB, MS F645, LOS ALAMOS, NM 87545 USA. NR 33 TC 39 Z9 39 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1993 VL 418 IS 1 BP 496 EP 505 DI 10.1086/173411 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MF864 UT WOS:A1993MF86400048 ER PT J AU HOSHINO, T ZELLER, R DEDERICHS, PH WEINERT, M AF HOSHINO, T ZELLER, R DEDERICHS, PH WEINERT, M TI MAGNETIC ENERGY ANOMALIES OF 3D SYSTEMS SO EUROPHYSICS LETTERS LA English DT Article ID CU; NI AB The cohesive and surface energies of 3d metals show an anomalous behavior since they are minimal in the middle of the 3d series. We show that similar anomalies of magnetic origin also occur for many other 3d systems, e.g. for the solution energies of 3d impurities in noble metals and for their binding energies to vacancies. Based on detailed electronic-structure calculations, we demonstrate that all these anomalies arise from the same physical origin: an increased tendency for magnetism for more isolated configurations, resulting in a gain of exchange energy. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP HOSHINO, T (reprint author), SHIZUOKA UNIV, COLL ENGN, DEPT GEN EDUC, HAMAMATSU, SHIZUOKA 432, JAPAN. RI Zeller, Rudolf/K-7094-2013 OI Zeller, Rudolf/0000-0002-9462-2649 NR 8 TC 23 Z9 23 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 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD NOV 20 PY 1993 VL 24 IS 6 BP 495 EP 500 DI 10.1209/0295-5075/24/6/012 PG 6 WC Physics, Multidisciplinary SC Physics GA MK663 UT WOS:A1993MK66300012 ER PT J AU SOMOZA, JR JIANG, F TONG, L KANG, CH CHO, JM KIM, SH AF SOMOZA, JR JIANG, F TONG, L KANG, CH CHO, JM KIM, SH TI 2 CRYSTAL-STRUCTURES OF A POTENTLY SWEET PROTEIN - NATURAL MONELLIN AT 2-CENTER-DOT-75 ANGSTROM RESOLUTION AND SINGLE-CHAIN MONELLIN AT 1-CENTER-DOT-7 ANGSTROM RESOLUTION SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE MONELLIN; SINGLE-CHAIN MONELLIN; SWEET PROTEIN; X-RAY CRYSTAL STRUCTURE; PROTEIN ENGINEERING ID SOLID-PHASE SYNTHESIS; DIOSCOREOPHYLLUM-CUMMINSII; MACROMOLECULAR STRUCTURES; SECONDARY STRUCTURE; TASTING PROTEINS; DIFFRACTION DATA; THAUMATIN-I; REFINEMENT; PRINCIPLE; PURIFICATION C1 UNIV CALIF BERKELEY,GRAD GRP BIOPHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LUCKY BIOTECH,EMERYVILLE,CA 94608. FU NIDCD NIH HHS [DC00145] NR 52 TC 73 Z9 77 U1 0 U2 2 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 NOV 20 PY 1993 VL 234 IS 2 BP 390 EP 404 DI 10.1006/jmbi.1993.1594 PG 15 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MG892 UT WOS:A1993MG89200013 PM 8230222 ER PT J AU CAREY, J COMBATTI, N LEWIS, DEA LAWSON, CL AF CAREY, J COMBATTI, N LEWIS, DEA LAWSON, CL TI COCRYSTALS OF ESCHERICHIA-COLI TRP REPRESSOR BOUND TO AN ALTERNATIVE OPERATOR DNA-SEQUENCE SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Note DE DNA-PROTEIN COCRYSTALLIZATION; BIASED RANDOM SEARCH; COOPERATIVITY; DNA SEQUENCE CONTEXT ID COMPLEX; TARGET C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP CAREY, J (reprint author), PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544, USA. FU NIGMS NIH HHS [GM13650] NR 12 TC 6 Z9 6 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 NOV 20 PY 1993 VL 234 IS 2 BP 496 EP 498 DI 10.1006/jmbi.1993.1602 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MG892 UT WOS:A1993MG89200021 PM 8230229 ER PT J AU BOOTHROYD, AT DOYLE, SM OSBORN, R AF BOOTHROYD, AT DOYLE, SM OSBORN, R TI THE MAGNETIC STATE OF PR IN PRBA2CU3O7 SO PHYSICA C LA English DT Article ID CRYSTAL-FIELD EXCITATIONS; ELECTRONIC-PROPERTIES; NEUTRON-SCATTERING; SUPERCONDUCTIVITY; Y1-XPRXBA2CU3O7-DELTA; SUPPRESSION; NDBA2CU3O7; YBA2CU3O7; VALENCE; IONS AB We present the results of a detailed theoretical analysis of neutron inelastic scattering measurements of the crystal-field excitations in PrBa2Cu3O7. Using a scaling procedure we estimate the crystal-field parameters for Pr3+ from those of Ho3+ determined from neutron spectra of HoBa2Cu3O7. With the scaled parameters as a starting point and guide we refine a model which is able to account for the main features of the crystal-field spectra of PrBa2Cu3O7, including the position of a peak in the neutron spectrum near 280 meV, presented here for the first time, arising from H-3(4) to H-3(5) intermultiplet transitions. The analysis leads us to propose the sequence Gamma(4)-Gamma(2)-Gamma(1) for the symmetries of the levels within the crystal-field-split quasi-triplet ground state, and we show that this level scheme is consistent with the observed magnetic anisotropy. We predict the excitation spectrum of Pr4+ by scaling the Pr3+ parameters, and use it to estimate an upper limit of 10% for the concentration of stable Pr4+ ions on the yttrium site. The prevalence of Pr3+ is consistent with a magnetic interaction, rather than hole-filling, as the major factor responsible for the absence of superconductivity in PrBa2Cu3O7. C1 UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BOOTHROYD, AT (reprint author), UNIV OXFORD,CLARENDON LAB,DEPT PHYS,PARKS RD,OXFORD OX1 3PU,OXON,ENGLAND. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 39 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 NOV 20 PY 1993 VL 217 IS 3-4 BP 425 EP 438 PG 14 WC Physics, Applied SC Physics GA MJ736 UT WOS:A1993MJ73600020 ER PT J AU DABROWSKI, B WANG, Z JORGENSEN, JD HITTERMAN, RL WAGNER, JL HUNTER, BA HINKS, DG AF DABROWSKI, B WANG, Z JORGENSEN, JD HITTERMAN, RL WAGNER, JL HUNTER, BA HINKS, DG TI SUPPRESSION OF SUPERCONDUCTING TRANSITION-TEMPERATURE IN ORTHORHOMBIC LA2-XCAXCUO4 SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; DISAPPEARANCE; LA2-XSRXCUO4; LA2-XBAXCUO4 AB The calcium solid-solubility limit in La2-xCaxCuO4 has been extended from x similar to 0.10 for air-synthesized material to x=0.2 using synthesis at an oxygen pressure of 600 atm and 1110 degrees C. The tetragonal-to-orthorhombic transition occurs at higher temperatures, or larger doping levels, than for the isostructural Sr-substituted material. The superconducting transition temperature increases with doping to 34 K at x=0.15 and is suppressed for x>0.15, similar to the Sr-substituted material. Comparison of structural and superconducting properties for Ca- and Sr-substituted materials indicated that: (1) both orthorhombic and tetragonal structures are superconducting; (2) at a fixed doping level, the optimum superconducting properties (the highest T-c) are found for a perfectly flat and square CuO2 plane; (3) T-c is suppressed by the distortions of the CuO2 plane or by overdoping resulting in a maximum of T-c found at x=0.15 under ambient conditions. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DABROWSKI, B (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 16 TC 24 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 20 PY 1993 VL 217 IS 3-4 BP 455 EP 460 DI 10.1016/0921-4534(93)90349-U PG 6 WC Physics, Applied SC Physics GA MJ736 UT WOS:A1993MJ73600023 ER PT J AU PULKKINEN, TI BAKER, DN OWEN, CJ GOSLING, JT MURPHY, N AF PULKKINEN, TI BAKER, DN OWEN, CJ GOSLING, JT MURPHY, N TI THIN CURRENT SHEETS IN THE DEEP GEOMAGNETIC TAIL SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SUBSTORM GROWTH-PHASE; DISTANT MAGNETOTAIL; PLASMA SHEET; ISEE-C; AVERAGE AB The ISEE-3 magnetic field and plasma electron data from Jan - March 1983 have been searched to study thin current sheets in the deep tail region. 33 events were selected where the spacecraft crossed through the current sheet from lobe to lobe within 15 minutes. The average thickness of the observed current sheets was 2.45R(E), and in 24 cases the current sheet was thinner than 3.OR(E); 6 very thin current sheets (thickness lambda < 0.5R(E)) were found. The electron data show that the very thin current sheets are associated with considerable temperature anisotropy. On average, the electron gradient current was approximately 17% of the total current, whereas the current arising from the electron temperature anisotropy varied between 8 - 45% of the total current determined from the lobe field magnitude. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. JET PROP LAB,PASADENA,CA 91109. RP PULKKINEN, TI (reprint author), FINNISH METEOROL INST,POB 503,SF-00101 HELSINKI,FINLAND. RI Owen, Christopher/C-2999-2008; Pulkkinen, Tuija/D-8403-2012 OI Owen, Christopher/0000-0002-5982-4667; Pulkkinen, Tuija/0000-0002-6317-381X NR 17 TC 41 Z9 41 U1 0 U2 0 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 NOV 19 PY 1993 VL 20 IS 22 BP 2427 EP 2430 DI 10.1029/93GL01590 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MJ641 UT WOS:A1993MJ64100004 ER PT J AU COWLEY, SC PERKINS, FW VALEO, EJ AF COWLEY, SC PERKINS, FW VALEO, EJ TI GENERATION OF HIGH-INTENSITY RF PULSES IN THE IONOSPHERE BY MEANS OF IN-SITU COMPRESSION SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID STRONG LANGMUIR TURBULENCE AB We demonstrate, using a simple model, that high intensity pulses can be generated, by making use of the dispersive properties of the ionosphere, from a modifier of much lower intensity whose frequency is a parabolic function of time. We show that such a frequency-chirped pulse can be constructed so that its various components overtake each other at a prescribed height, resulting in large (up to one hundred times) transient intensity enhancements as compared to those achievable from a steady modifier operating at the same power. We examine briefly one possible application: the enhancement of plasma wave amplitudes which occurs as a result of the interaction of such a compressed pulse with pre-generated turbulence. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. NR 10 TC 1 Z9 1 U1 0 U2 1 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 NOV 19 PY 1993 VL 20 IS 22 BP 2431 EP 2434 DI 10.1029/93GL02842 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MJ641 UT WOS:A1993MJ64100005 ER PT J AU HUNTER, DE SCHWARTZ, SE WAGENER, R BENKOVITZ, CM AF HUNTER, DE SCHWARTZ, SE WAGENER, R BENKOVITZ, CM TI SEASONAL, LATITUDINAL, AND SECULAR VARIATIONS IN TEMPERATURE TREND - EVIDENCE FOR INFLUENCE OF ANTHROPOGENIC SULFATE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID EMISSIONS; CLIMATE; ATMOSPHERE; MODEL AB Tropospheric aerosols increase the shortwave reflectivity of the Earth-atmosphere system both by scattering light directly, in the absence of clouds, and by enhancing cloud reflectivity. The radiative forcing of climate exerted by anthropogenic sulfate aerosols, derived mainly from SO2 emitted from fossil fuel combustion, is opposite that due to anthropogenic greenhouse gases and is estimated to be of comparable average magnitude in Northern Hemisphere midlatitudes. However, persuasive evidence of climate response to this forcing has thus far been lacking. Here we examine patterns of seasonal and latitudinal variations in temperature anomaly trend for evidence of such a response. Pronounced minima in the rate of temperature increase in summer months in Northern Hemisphere midlatitudes are consistent with the latitudinal distribution of anthropogenic sulfate and changes in the rate of SO2 emissions over the industrial era. C1 BROOKHAVEN NATL LAB,DIV ENVIRONM CHEM,UPTON,NY 11973. RI Wagener, Richard/B-5445-2008; Schwartz, Stephen/C-2729-2008 OI Wagener, Richard/0000-0003-3892-1182; Schwartz, Stephen/0000-0001-6288-310X NR 33 TC 26 Z9 27 U1 0 U2 1 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 NOV 19 PY 1993 VL 20 IS 22 BP 2455 EP 2458 DI 10.1029/93GL02808 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MJ641 UT WOS:A1993MJ64100011 ER PT J AU EBERLY, JH KULANDER, KC AF EBERLY, JH KULANDER, KC TI ATOMIC STABILIZATION BY SUPERINTENSE LASERS SO SCIENCE LA English DT Article ID MULTIPHOTON IONIZATION; HIGH-FREQUENCY; SUPERINTENSE FIELDS; ELECTRON-SPECTRA; HYDROGEN-ATOM; RARE-GASES; RADIATION; SUPPRESSION; DICHOTOMY; STATES AB Supercomputer simulations predict the creation of an unexpectedly stable form of atomic matter when ordinary atoms are irradiated by very intense, high-frequency laser pulses. In the rising edge of a very intense pulse of ionizing radiation, the atom's wave function distorts adiabatically into a distribution with two well-separated peaks. As the intensity increases, the peak spacing increases so that the atomic electron spends more time far from the nucleus and the ionization rate decreases. This leads to the surprising and counter-intuitive result that the atom becomes more stable as the ionizing radiation gets stronger. C1 LAWRENCE LIVERMORE NATL LAB,PHYS DIRECTORATE,THEORET ATOM & MOLEC PHYS GRP,LIVERMORE,CA 94550. RP EBERLY, JH (reprint author), UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627, USA. NR 34 TC 107 Z9 107 U1 1 U2 9 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 19 PY 1993 VL 262 IS 5137 BP 1229 EP 1233 DI 10.1126/science.262.5137.1229 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MH324 UT WOS:A1993MH32400029 PM 17772644 ER PT J AU CESS, RD ZHANG, MH POTTER, GL BARKER, HW COLMAN, RA DAZLICH, DA DELGENIO, AD ESCH, M FRASER, JR GALIN, V GATES, WL HACK, JJ INGRAM, WJ KIEHL, JT LACIS, AA LETREUT, H LI, ZX LIANG, XZ MAHFOUF, JF MCAVANEY, BJ MELESHKO, VP MORCRETTE, JJ RANDALL, DA ROECKNER, E ROYER, JF SOKOLOV, AP SPORYSHEV, PV TAYLOR, KE WANG, WC WETHERALD, RT AF CESS, RD ZHANG, MH POTTER, GL BARKER, HW COLMAN, RA DAZLICH, DA DELGENIO, AD ESCH, M FRASER, JR GALIN, V GATES, WL HACK, JJ INGRAM, WJ KIEHL, JT LACIS, AA LETREUT, H LI, ZX LIANG, XZ MAHFOUF, JF MCAVANEY, BJ MELESHKO, VP MORCRETTE, JJ RANDALL, DA ROECKNER, E ROYER, JF SOKOLOV, AP SPORYSHEV, PV TAYLOR, KE WANG, WC WETHERALD, RT TI UNCERTAINTIES IN CARBON-DIOXIDE RADIATIVE FORCING IN ATMOSPHERIC GENERAL-CIRCULATION MODELS SO SCIENCE LA English DT Article ID SURFACE-TEMPERATURE; CLIMATE FEEDBACK; CO2 AB Global warming, caused by an increase in the concentrations of greenhouse gases, is the direct result of greenhouse gas-induced radiative forcing. When a doubling of atmospheric carbon dioxide is considered, this forcing differed substantially among 15 atmospheric general circulation models. Although there are several potential causes, the largest contributor was the carbon dioxide radiation parameterizations of the models. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CANADIAN CLIMATE CTR,DOWNSVIEW M3H 5T4,ON,CANADA. BUR METEOROL RES CTR,MELBOURNE,VIC 3001,AUSTRALIA. COLORADO STATE UNIV,FT COLLINS,CO 80523. NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. MAX PLANCK INST METEOROL,W-2000 HAMBURG 13,GERMANY. RUSSIAN ACAD SCI,DEPT NUMER MATH,MOSCOW 117334,RUSSIA. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. METEOROL OFF,HADLEY CTR CLIMATE PREDICT & RES,BRACKNELL RG12 2SY,BERKS,ENGLAND. LAB METEOROL DYNAM,F-75231 PARIS 05,FRANCE. SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12205. CTR NATL RECH METEOROL,DIRECT METEOROL NATL,F-31057 TOULOUSE,FRANCE. VOEIKOV MAIN GEOPHYS OBSERV,ST PETERSBURG 194018,RUSSIA. EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS,READING RG2 9AX,BERKS,ENGLAND. PRINCETON UNIV,NOAA,GEOPHYS FLUID DYNAM LAB,PRINCETON,NJ 08544. RP CESS, RD (reprint author), SUNY STONY BROOK,MARINE SCI RES CTR,INST TERR & PLANETARY ATMOSPHERES,STONY BROOK,NY 11794, USA. RI Taylor, Karl/F-7290-2011; Lacis, Andrew/D-4658-2012; Del Genio, Anthony/D-4663-2012; Randall, David/E-6113-2011; Sporyshev, Petr/P-7323-2015; OI Taylor, Karl/0000-0002-6491-2135; Del Genio, Anthony/0000-0001-7450-1359; Randall, David/0000-0001-6935-4112; Sporyshev, Petr/0000-0002-4047-8178; Li, Laurent/0000-0002-3855-3976 NR 11 TC 64 Z9 66 U1 1 U2 11 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 19 PY 1993 VL 262 IS 5137 BP 1252 EP 1255 DI 10.1126/science.262.5137.1252 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MH324 UT WOS:A1993MH32400035 PM 17772648 ER PT J AU XU, Y BAE, YK BEUHLER, RJ FRIEDMAN, L AF XU, Y BAE, YK BEUHLER, RJ FRIEDMAN, L TI SECONDARY-ELECTRON ANALYSIS OF POLYMERIC IONS GENERATED BY AN ELECTROSPRAY ION-SOURCE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MASS-SPECTROMETRY AB Electrospray mass spectra of biopolymeric ions can be used to determine ion masses using secondary electron pulse spectra. Secondary electron yields reflect electronic excitation deposited in a solid target, which is related to the electron density and velocity of projectile ions. Secondary electron pulse spectra provide a fingerprint which measures masses of ions of known velocity. Ions with masses from 411 (tetraheptylammonium ion) to 480 000 (apoferritin) amu give secondary electron yields that fall on a single curve of secondary electrons/amu plotted as a function of ion velocity. Secondary electron analysis revealed decomposition of larger polyethylene glycol ions (m > 10 000 amu). C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 5 TC 17 Z9 17 U1 0 U2 3 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 NOV 18 PY 1993 VL 97 IS 46 BP 11883 EP 11886 DI 10.1021/j100148a008 PG 4 WC Chemistry, Physical SC Chemistry GA MH563 UT WOS:A1993MH56300008 ER PT J AU RAJH, T MICIC, OI NOZIK, AJ AF RAJH, T MICIC, OI NOZIK, AJ TI SYNTHESIS AND CHARACTERIZATION OF SURFACE-MODIFIED COLLOIDAL CDTE QUANTUM DOTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-TRANSFER REACTIONS; FLAT-BAND POTENTIALS; SEMICONDUCTOR CLUSTERS; PULSE-RADIOLYSIS; OPTICAL NONLINEARITY; SIZE QUANTIZATION; CDSE COLLOIDS; CRYSTALLITES; CADMIUM; METAL AB The controlled synthesis of quantized colloidal CdTe nanocrystals (in aqueous solutions) with narrow size distributions and stabilized against rapid oxidation was achieved by capping the quantum dot particles with 3-mercapto-1,2-propanediol. Nanocrystals (i.e., quantum dots) with mean diameters of 20, 25, 35, and 40 Angstrom were produced. Optical absorption spectra showed strong excitonic peaks at the smallest size; the absorption coefficient was shown to follow an inverse cube dependence on particle diameter, while the extinction coefficient per particle remained constant. The quantum yield for photoluminescence increased with decreasing particle size and reached 20% at 20 Angstrom. The valence band edges of the CdTe quantum dots were determined by pulse radiolysis experiments (hole injection from oxidizing radicals); the bandgaps were estimated from pulse radiolysis data (redox potentials of hole and electron injecting radicals) and from the optical spectra. The dependence of the CdTe bandgap on quantum dot size was found to be much weaker than predicted by the effective mass approximation; this result is consistent with recently published theoretical calculations by several groups. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. VINCA,INST NUCL SCI,YU-11001 BELGRADE,YUGOSLAVIA. NR 57 TC 304 Z9 318 U1 9 U2 144 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 NOV 18 PY 1993 VL 97 IS 46 BP 11999 EP 12003 DI 10.1021/j100148a026 PG 5 WC Chemistry, Physical SC Chemistry GA MH563 UT WOS:A1993MH56300026 ER PT J AU MULLINS, DR LYMAN, PF AF MULLINS, DR LYMAN, PF TI ADSORPTION AND REACTION OF METHANETHIOL ON RU(0001) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID DECOMPOSITION; SULFUR; SURFACES; NI(110); NI(100); CH3SH; H-2; DESORPTION; MECHANISM; THIOPHENE AB Methanethiol (CH3SH) adsorbs dissociatively on Ru(0001) at 100 K forming two molecular intermediates. These species have been identified by S 2p soft X-ray photoelectron spectroscopy (SXPS) as methylthiolate moieties adsorbed in different bonding sites. At low coverages only a high coordination adsorption site is occupied. The high coordination site is saturated at about 0.20 monolayer of CH3SH, and then a low coordination site is populated. Upon heating, the thiolates totally decompose into atomic C, S, and gaseous H-2 with a competing pathway producing atomic S and gaseous CH4 at high coverage. The methylthiolate in the low coordination site decomposes more readily than the methylthiolate in the high coordination site. Some surface hydrocarbon fragments are formed following C-S bond scission which totally decompose at higher temperatures. Isotopic labeling indicates that the desorption of the sulfhydryl hydrogen precedes the decomposition of the thiolate at high coverage and that there is exchange of hydrogen between the surface and the methyl group. RP MULLINS, DR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 32 TC 33 Z9 33 U1 0 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 NOV 18 PY 1993 VL 97 IS 46 BP 12008 EP 12013 DI 10.1021/j100148a028 PG 6 WC Chemistry, Physical SC Chemistry GA MH563 UT WOS:A1993MH56300028 ER PT J AU GASTEIGER, HA MARKOVIC, N ROSS, PN CAIRNS, EJ AF GASTEIGER, HA MARKOVIC, N ROSS, PN CAIRNS, EJ TI METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RN ALLOYS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SMALL ORGANIC-MOLECULES; RU BIMETALLIC CLUSTERS; ELECTROCATALYTIC OXIDATION; PLATINUM-ELECTRODE; RUTHENIUM ELECTRODES; OXYGEN EVOLUTION; FORMIC-ACID; SURFACE; DECOMPOSITION; CO AB The catalytic activity of single-phase polycrystalline Pt-Ru bulk alloys toward the electrooxidation of methanal in sulfuric acid electrolyte at room temperature was measured for the first time on well-characterized alloy surfaces, in terms of surface composition and true surface area. Sputter-cleaned and annealed alloys were prepared in ultrahigh vacuum (UHV) and the surface composition of oxygen-free surfaces was assessed via low-energy ion scattering (LEIS). Pt-Ru alloy surfaces annealed in UHV were strongly enriched in Pt, whereas the surface composition of sputter-cleaned alloys was essentially identical to their bulk composition. It was shown that the sputter-cleaned alloy with a Ru surface of approximate to 10 atomic % gave the highest catalytic enhancement (over pure Pt) for the steady-state electrooxidation of methanal at 25 degrees C and 0.5 V, viz., by a factor of 12 in 5.0 mM CH3OH solution and by a factor of 30 in 0.5 M CH3OH. It was found that the balance between the rate of methanol adsorption and the rate of the oxidative removal of dehydrogenated fragments determines the activities of Pt-Ru alloys with different Ru surface compositions. On the basis of this study we concluded that the high catalytic activity of Pt-Ru alloys in the electrooxidation of methanal derives from the bifunctional character of the alloy surface: the adsorption of methanal on Pt ensembles and the oxidative removal of methanal dehydrogenation fragments by oxygen-like species adsorbed onto adjacent Ru atoms. A statistical model is presented which predicts rather precisely the optimum alloy composition of approximate to 10 atomic percent. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP GASTEIGER, HA (reprint author), LAWRENCE BERKELEY LAB,MAIL STOP 2-100,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Cairns, Elton/E-8873-2012 OI Cairns, Elton/0000-0002-1179-7591 NR 51 TC 754 Z9 763 U1 16 U2 143 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 NOV 18 PY 1993 VL 97 IS 46 BP 12020 EP 12029 DI 10.1021/j100148a030 PG 10 WC Chemistry, Physical SC Chemistry GA MH563 UT WOS:A1993MH56300030 ER PT J AU SCHOENLEIN, RW PETEANU, LA WANG, Q MATHIES, RA SHANK, CV AF SCHOENLEIN, RW PETEANU, LA WANG, Q MATHIES, RA SHANK, CV TI FEMTOSECOND DYNAMICS OF CIS-TRANS ISOMERIZATION IN A VISUAL PIGMENT ANALOG - ISORHODOPSIN SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PICOSECOND LASER PHOTOLYSIS; ROOM-TEMPERATURE; RETINAL CHROMOPHORE; ABSORPTION-SPECTRA; ENERGY-STORAGE; 1ST STEP; RHODOPSIN; BACTERIORHODOPSIN; BATHORHODOPSIN; SPECTROSCOPY AB The photochemical cis-trans isomerization of the visual pigment analog isorhodopsin is investigated using femtosecond pump-probe techniques. The 9-cis-retinal protonated Schiff base chromophore in isorhodopsin is excited with a 40-fs pump pulse at 500 nm, and the transient changes in absorption are measured from 450 to 570 nm using a 10-fs probe pulse centered at 500 nm and from 570 to 670 nm using a 10-fs probe pulse centered at 620 nm. Immediately following the pump pulse we observe a strong excited-state absorption with a maximum at approximate to 530 nm and a stimulated emission feature extending from 590 to 670 nm. Both of these features persist for 100-150 fs, indicating that the excited-state torsional dynamics of 9-cis isorhodopsin are significantly slower than those of the 11-cis chromophore in rhodopsin. An absorption feature between 525 and 670 nm fully develops in approximate to 600 fs, indicating the formation of photoproduct on this time scale. The isomerization time in isorhodopsin is significantly slower than that of rhodopsin (200 fs). The slower isomerization time and the slower excited-state dynamics in isorhodopsin are consistent with the idea that the photochemical quantum yield in these pigments (Phi(iso) = 0.22, Phi(rho) = 0.67) depends on the dynamics of the excited-state torsional wave packet, according to a Landau-Zener potential-surface crossing mechanism. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP SCHOENLEIN, RW (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 32 TC 76 Z9 77 U1 0 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 NOV 18 PY 1993 VL 97 IS 46 BP 12087 EP 12092 DI 10.1021/j100148a040 PG 6 WC Chemistry, Physical SC Chemistry GA MH563 UT WOS:A1993MH56300040 ER PT J AU CASEY, WH WESTRICH, HR BANFIELD, JF FERRUZZI, G ARNOLD, GW AF CASEY, WH WESTRICH, HR BANFIELD, JF FERRUZZI, G ARNOLD, GW TI LEACHING AND RECONSTRUCTION AT THE SURFACES OF DISSOLVING CHAIN-SILICATE MINERALS SO NATURE LA English DT Article ID DISSOLUTION KINETICS; REACTION-RATES; FELDSPAR; WOLLASTONITE; HYDROLYSIS; CHRYSOTILE; MECHANISM; PYROXENE AB THE pathways by which silicate minerals transform to solutes, clays and amorphous solids are relevant to a wide range of natural, industrial and even medical concerns. For example, weathered layers on silicate may have a high sorptive capacity, affecting nutrient and contamination retention in soils; less obviously, such layers on inhaled silicate grains might affect their interaction with lung tissue. Here we report the observation, in dissolution experiments on a range of chain-silicate minerals, of the formation of a near-surface amorphous region enriched in silicon and hydrogen, and depleted in other metals. Raman spectroscopy and ion-beam elemental analysis show that portions of the polymeric silicate anion in this region spontaneously reconstruct to form a network that contains four-member silicate rings and areas of incipient crystallization. If hydrolysable metals interact with the silicate anion during this reconstruction, clays and amorphous products may form directly. This process complements traditional dissolution-precipitation pathways of mineral diagenesis1, as the silicon does not have to be present in solution before being incorporated into a growing secondary phase. C1 UNIV CALIF DAVIS,DEPT GEOL,DAVIS,CA 95616. SANDIA NATL LABS,GEOCHEM RES,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DIV ION SOLID & INTERACT,ALBUQUERQUE,NM 87185. UNIV WISCONSIN,DEPT GEOL,MADISON,WI 53706. RP CASEY, WH (reprint author), UNIV CALIF DAVIS,DEPT LAND AIR & WATER RESOURCES,DAVIS,CA 95616, USA. NR 28 TC 141 Z9 141 U1 7 U2 55 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 18 PY 1993 VL 366 IS 6452 BP 253 EP 256 DI 10.1038/366253a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MH325 UT WOS:A1993MH32500059 ER PT J AU WHITE, TD SUWA, G HART, WK WALTER, RC WOLDEGABRIEL, G DEHEINZELIN, J CLARK, JD ASFAW, B VRBA, E AF WHITE, TD SUWA, G HART, WK WALTER, RC WOLDEGABRIEL, G DEHEINZELIN, J CLARK, JD ASFAW, B VRBA, E TI NEW DISCOVERIES OF AUSTRALOPITHECUS AT MAKA IN ETHIOPIA SO NATURE LA English DT Article ID MIDDLE AWASH VALLEY; AFARENSIS; MORPHOLOGY; EVOLUTION; STRATIGRAPHY; HOMINIDS; AGE AB THE taxonomy of Australopithecus afarensis, the oldest known hominid species, has been a matter of debate since its description in 1978 (ref. 1). Some authorities regard all specimens assigned to A. afarensis as belonging to a single taxon2-4 whereas others regard the Tanzanian and Ethiopian specimens as each representing a different species5,6. Further controversy surrounds the issues of sexual dimorphism and locomotion among these hominids. Resolution of these problems would shed light on hominid phylogeny in general and on the ancestry of later Australopithecus and Homo. Fossils discovered in the Afar of Ethiopia in 1990 constitute the first major addition to the 3-4 million year (Myr) hominid record since the 1970s. We report here the discovery of new fossils from Maka, dated to 3.4 Myr ago, which provide powerful support for the interpretation of A. afarensis as a single, ecologically diverse, sexually dimorphic, bipedal Pliocene primate species whose known range encompassed Ethiopia and Tanzania. C1 UNIV TOKYO,DEPT ANTHROPOL,BUNKYO KU,TOKYO 113,JAPAN. MIAMI UNIV,DEPT GEOL,OXFORD,OH 45056. INST HUMAN ORIGINS,CTR GEOCHRONOL,BERKELEY,CA 94709. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. INST ROYAL SCI NAT BELGIQUE,B-1040 BRUSSELS,BELGIUM. UNIV CALIF BERKELEY,DEPT ANTHROPOL,BERKELEY,CA 94720. PALEOANTHROPOL LAB,ADDIS ABABA,ETHIOPIA. YALE UNIV,DEPT GEOL & GEOPHYS,NEW HAVEN,CT 06511. RP WHITE, TD (reprint author), UNIV CALIF BERKELEY,DEPT ANTHROPOL,HUMAN EVOLUT STUDIES LAB,BERKELEY,CA 94720, USA. NR 43 TC 110 Z9 111 U1 0 U2 8 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 18 PY 1993 VL 366 IS 6452 BP 261 EP 265 DI 10.1038/366261a0 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MH325 UT WOS:A1993MH32500062 PM 8232584 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COTOROBAI, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COTOROBAI, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI INCLUSIVE SEARCH FOR THE CHARMLESS RADIATIVE DECAY OF THE B-QUARK (B-]S-GAMMA) SO PHYSICS LETTERS B LA English DT Article ID MONTE-CARLO; QCD ENHANCEMENT; TOP QUARK; SUPERSYMMETRY; EMISSION; PHYSICS; MESONS AB We report on the search for the electromagnetic penguin decay b --> sgamma at square-root s almost-equal-to m(Z). We find no evidence for a signal and place an upper limit on the decay rate Br(b --> sgamma) < 1.2 x 10(-3) at 90% C.L. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CNRS, IN2P3, LAPP, F-74941 ANNECY LE VIEUX, FRANCE. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. INST HIGH ENERGY PHYS, 100039 BEIJING, PEOPLES R CHINA. INFN, I-40126 BOLOGNA, ITALY. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. BOSTON UNIV, BOSTON, MA 02215 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. UNIV BUCHAREST, BUCHAREST, ROMANIA. INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV FLORENCE, I-50125 FLORENCE, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. INFN, I-20133 MILAN, ITALY. ITEP, MOSCOW, RUSSIA. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, 6500 HB NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CALTECH, PASADENA, CA 91125 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. INFN, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, 305701 TAEJON, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV LYON 1, CNRS, IN2P3, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. MIT, CAMBRIDGE, MA 02139 USA. RP ADRIANI, O (reprint author), INFN, I-50125 FLORENCE, ITALY. RI van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Tsaregorodtsev, Andrei/E-3873-2016; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; Fiandrini, Emanuele/C-4549-2008; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Josa, Isabel/K-5184-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014 OI Diemoz, Marcella/0000-0002-3810-8530; Filthaut, Frank/0000-0003-3338-2247; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023 NR 46 TC 8 Z9 8 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. Lett. B PD NOV 18 PY 1993 VL 317 IS 4 BP 637 EP 646 DI 10.1016/0370-2693(93)91384-Y PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MH093 UT WOS:A1993MH09300026 ER PT J AU LEUNG, WC QUINTAS, PZ MISHRA, SR SCIULLI, F ARROYO, C BACHMANN, KT BLAIR, RE FOUDAS, C KING, BJ LEFMANN, WC OLTMAN, E RABINOWITZ, SA SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK SANDLER, PH SMITH, WH AF LEUNG, WC QUINTAS, PZ MISHRA, SR SCIULLI, F ARROYO, C BACHMANN, KT BLAIR, RE FOUDAS, C KING, BJ LEFMANN, WC OLTMAN, E RABINOWITZ, SA SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK SANDLER, PH SMITH, WH TI A MEASUREMENT OF THE GROSS-LLEWELLYN SMITH SUM-RULE FROM THE CCFR XF(3) STRUCTURE-FUNCTION SO PHYSICS LETTERS B LA English DT Article ID NUCLEON STRUCTURE FUNCTIONS; ENERGY NEUTRINO INTERACTIONS; CURRENT CROSS-SECTION; ANTINEUTRINO SCATTERING; L/SIGMA-T; DEUTERIUM; PROTON AB We report a measurement of the Gross-Llewellyn Smith sum rule: integral(1/x)dx xF3(x, Q2 = 3 GeV2) = 2.50 +/- 0.018 (stat.) +/- 0.078(syst.). C1 COLUMBIA UNIV,NEW YORK,NY 10027. UNIV CHICAGO,CHICAGO,IL 60637. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV WISCONSIN,MADISON,WI 53706. RP LEUNG, WC (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 29 TC 74 Z9 74 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 NOV 18 PY 1993 VL 317 IS 4 BP 655 EP 659 DI 10.1016/0370-2693(93)91386-2 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MH093 UT WOS:A1993MH09300028 ER PT J AU GURBIEL, RJ FANN, YC SURERUS, KK WERST, MM MUSSER, SM DOAN, PE CHAN, SI FEE, JA HOFFMAN, BM AF GURBIEL, RJ FANN, YC SURERUS, KK WERST, MM MUSSER, SM DOAN, PE CHAN, SI FEE, JA HOFFMAN, BM TI DETECTION OF 2 HISTIDYL LIGANDS TO CU-A OF CYTOCHROME-OXIDASE BY 35-GHZ ENDOR - N-14,15 AND CU-63,65 ENDOR STUDIES OF THE CU-A SITE IN BOVINE HEART CYTOCHROME-AA(3) AND CYTOCHROME-CAA(3) AND CYTOCHROME-BA(3) FROM THERMUS-THERMOPHILUS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID NUCLEAR DOUBLE-RESONANCE; RESPIRATORY PROTEINS; TERMINAL OXIDASE; COPPER PROTEINS; SINGLE-CRYSTALS; GENERAL-THEORY; SPECTRA; SPECTROSCOPY; PATTERNS; HB8 AB To study the ligation of the Cu(A) site of heme-copper terminal oxidases, we have performed ENDOR measurements at X-band (9-GHz) and 35-GHz microwave frequencies on the three titled enzymes. The 35-GHz measurements provide complete spectral separation of the H-1 and N-14 resonances and permit analysis of the field dependence of the N-14 ENDOR for each enzyme. The results indicate that two nitrogenous ligands were quite unequal hyperfine couplings are ligated to Cu(A) in each of the enzymes studied. We have also examined cytochrome caa3 isolated from His- Thermus cells grown in the presence of D,L-[delta,epsilon-N-15(2)]histidine. The 35-GHz Cu(A) ENDOR spectrum of this protein includes N-15 ENDOR resonances whose frequencies confirm the presence of two nitrogenous ligands; comparison with the N-14 ENDOR spectra further shows that the ligand with the larger hyperfine coupling (N1) displays well-resolved N-14 quadrupole splitting. The theory for simulating frozen-solution ENDOR spectra as refined here permits a determination of both hyperfine and quadrupole tensors for N1 of all three enzymes. These indicate that the bonding parameters and geometry of Cu(A) are well conserved. These measurements demonstrate unequivocally that two histidylimidazole N atoms are coordinated to Cu(A) in the oxidized form of the enzyme and provide a first indication of the site geometry. On the basis of the previously established sequence homology among these heme-copper oxidases, it is likely that the two histidine residues conserved in all subunit II and subunit IIc sequences form part of the Cu(A) binding site. The Cu(A) sites in the three enzymes are further compared through Cu-63, Cu-65 ENDOR. C1 NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. JAGIELLONIAN UNIV,INST MOLEC BIOL,PL-31120 KRAKOW,POLAND. CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,PASADENA,CA 91125. UNIV CALIF SAN DIEGO,DEPT BIOL,LA JOLLA,CA 92093. RI Surerus, Kristene/I-1716-2016 NR 58 TC 58 Z9 58 U1 1 U2 7 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 NOV 17 PY 1993 VL 115 IS 23 BP 10888 EP 10894 DI 10.1021/ja00076a053 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA MH752 UT WOS:A1993MH75200053 ER PT J AU GLENDENING, ED FAUST, R STREITWIESER, A VOLLHARDT, KPC WEINHOLD, F AF GLENDENING, ED FAUST, R STREITWIESER, A VOLLHARDT, KPC WEINHOLD, F TI THE ROLE OF DELOCALIZATION IN BENZENE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID DRIVING FORCE; ELECTRONIC DELOCALIZATION; PI-ELECTRON; SIGMA; RESONANCE; CHEMISTRY; ABINITIO; HETEROANNULENES; CYCLOBUTADIENE; AROMATICITY AB The influence of pi delocalization on the geometry of benzene is examined at the ab initio SCF level of theory. We find that benzene favors a bond alternating geometry when its canonical pi MOs are replaced by three localized ethylenic orbitals, revealing that delocalization is in part responsible for the equilibrium symmetric structure. In apparent contrast, a sigma-pi energy partitioning analysis suggests that the benzene sigma framework is responsible for the symmetric structure, the pi system preferring a distorted geometry. Shaik et al. have therefore concluded that delocalization in not an important symmetrizing force in this molecule. We show, however, that the pi energy component contains a sizable and strongly geometry dependent contribution from the localized (Kekule) wave function. Thus, it appears to be misleading to judge the nature of delocalization based on a sigma-pi partition. We conclude that delocalization effects act to strongly stabilize symmetric benzene in essential accord with the concepts of classical resonance theory. C1 UNIV WISCONSIN, INST THEORET CHEM, MADISON, WI 53706 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. UNIV WISCONSIN, DEPT CHEM, MADISON, WI 53706 USA. RI Faust, Rudiger/K-4891-2014; OI Faust, Rudiger/0000-0002-9231-591X; Weinhold, Frank/0000-0002-9580-054X NR 43 TC 106 Z9 106 U1 0 U2 5 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 NOV 17 PY 1993 VL 115 IS 23 BP 10952 EP 10957 DI 10.1021/ja00076a061 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA MH752 UT WOS:A1993MH75200061 ER PT J AU SCHOONOVER, JR GORDON, KC ARGAZZI, R WOODRUFF, WH PETERSON, KA BIGNOZZI, CA DYER, RB MEYER, TJ AF SCHOONOVER, JR GORDON, KC ARGAZZI, R WOODRUFF, WH PETERSON, KA BIGNOZZI, CA DYER, RB MEYER, TJ TI APPLICATION OF TRANSIENT INFRARED-SPECTROSCOPY TO INTRAMOLECULAR ENERGY-TRANSFER IN [(PHEN)(CO)3RE(I)(NC)RU(II)(CN)(BPY)2]+ SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID RESOLVED RESONANCE RAMAN; TRANSITION-METAL COMPLEXES; EXCITED-STATES; ELECTRON-TRANSFER; POLYPYRIDYL COMPLEXES; CHARGE-TRANSFER; RUTHENIUM(II) COMPLEXES; VIBRATIONAL-SPECTRA; TRIS(BIPYRIDINE)RUTHENIUM(II); IR C1 UNIV FERRARA, DIPARTIMENTO CHIM, I-44100 FERRARA, ITALY. LOS ALAMOS NATL LAB, DIV CHEM & LASER SCI, PHOTOCHEM GRP, LOS ALAMOS, NM 87545 USA. RP SCHOONOVER, JR (reprint author), UNIV N CAROLINA, DEPT CHEM, CHAPEL HILL, NC 27599 USA. RI Gordon, Keith/B-7149-2008; Argazzi, Roberto/C-4819-2015; OI Argazzi, Roberto/0000-0002-2619-6860; Bignozzi, Carlo Alberto/0000-0002-7882-3694; Gordon, Keith/0000-0003-2833-6166 NR 41 TC 76 Z9 76 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 17 PY 1993 VL 115 IS 23 BP 10996 EP 10997 DI 10.1021/ja00076a070 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MH752 UT WOS:A1993MH75200070 ER PT J AU ECKERT, J JENSEN, CM JONES, G CLOT, E EISENSTEIN, O AF ECKERT, J JENSEN, CM JONES, G CLOT, E EISENSTEIN, O TI AN EXTREMELY LOW BARRIER TO ROTATION OF DIHYDROGEN IN THE COMPLEX IRCLH2(ETA(2)-H2)(P(I)PR3)2 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID MOLECULAR-HYDROGEN; SOLID-STATE; DYNAMICS C1 UNIV HAWAII MANOA,DEPT CHEM,HONOLULU,HI 96822. UNIV PARIS 11,CHIM THEOR LAB,ICMO,URA 506,F-91405 ORSAY,FRANCE. RP ECKERT, J (reprint author), LOS ALAMOS NATL LAB,LANSCE,MS H805,LOS ALAMOS,NM 87545, USA. RI Clot, Eric/P-9585-2015; Eisenstein, Odile/I-1704-2016 OI Clot, Eric/0000-0001-8332-5545; Eisenstein, Odile/0000-0001-5056-0311 NR 15 TC 21 Z9 21 U1 0 U2 2 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 NOV 17 PY 1993 VL 115 IS 23 BP 11056 EP 11057 DI 10.1021/ja00076a100 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MH752 UT WOS:A1993MH75200100 ER PT J AU LEMON, DD CALHOUN, MW GENNIS, RB WOODRUFF, WH AF LEMON, DD CALHOUN, MW GENNIS, RB WOODRUFF, WH TI THE GATEWAY TO THE ACTIVE-SITE OF HEME COPPER OXIDASES SO BIOCHEMISTRY LA English DT Note ID CYTOCHROME-C-OXIDASE; TRANSFORM INFRARED-SPECTROSCOPY; SPERM WHALE MYOGLOBIN; O UBIQUINOL OXIDASE; ESCHERICHIA-COLI; LIGAND-BINDING; DIRECTED MUTAGENESIS; COMPLEX; PHOTODISSOCIATION; TEMPERATURE AB The spectroscopy and dynamics of CO binding were measured for wild-type and mutant cytochromes bo, members of the superfamily of heme-copper oxidases. The results suggest that access of ligands, including substrate O2, to the binuclear Fe-Cu active site is controlled at two levels. CO recombination to the wild-type ubiquinol oxidase exhibited saturation kinetics (k(max) = 190 s-1, K(m) = 2.4 mM), indicative of the existence of an intermediate in the ligand-binding pathway. FTIR spectroscopy and TRIR spectroscopy were used to demonstrate conclusively that this intermediate was a Cu(B)-CO complex. Two mutant oxidases (His333Leu, His334Leu) which lack Cu(B) showed no evidence of saturation of CO rebinding, even up to 21 mM CO. Also, the absolute rates of CO binding to the mutant oxidases were much greater than for wild type, even at CO concentrations well below the apparent K(m) for wild-type enzyme. These results clearly indicate that the copper ion at the binuclear site acts as an obligatory way station, or gate, severely limiting the approach of ligands to the heme active site. Further, an analysis of the rate constants for CO binding to Cu(B) suggests that the protein structure external to the binuclear site regulates ligand entry into this site. We propose that these control mechanisms for substrate binding are operative throughout this general class of enzymes. C1 LOS ALAMOS NATL LAB,INC-14,MAIL STOP C345,LOS ALAMOS,NM 87545. UNIV ILLINOIS,SCH CHEM SCI,URBANA,IL 61801. FU NIDDK NIH HHS [DK36263] NR 27 TC 70 Z9 71 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 16 PY 1993 VL 32 IS 45 BP 11953 EP 11956 DI 10.1021/bi00096a002 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MG893 UT WOS:A1993MG89300002 PM 8218269 ER PT J AU CAUSGROVE, TP DYER, RB AF CAUSGROVE, TP DYER, RB TI PROTEIN RESPONSE TO PHOTODISSOCIATION OF CO FROM CARBONMONOXYMYOGLOBIN PROBED BY TIME-RESOLVED INFRARED-SPECTROSCOPY OF THE AMIDE-I BAND SO BIOCHEMISTRY LA English DT Article ID SECONDARY STRUCTURE; CARBON-MONOXIDE; LIGAND-BINDING; SPERM WHALE; CONFORMATIONAL-CHANGES; MYOGLOBIN; DYNAMICS; HEMOGLOBIN; SPECTRA; ABSORPTION AB Protein conformational changes coupled to the ligation reactions of carbon monoxide in myoglobin (Mb) are detected by time-resolved infrared spectroscopy. An apparatus based on a tunable diode laser operating in the region of 1650 cm-1 is used to probe changes in the amide I absorption band of the protein in response to photodissociation and subsequent rebinding of CO. The time course of changes in the amide I band is shown to follow the recombination of photolyzed CO with Mb. A time-resolved difference spectrum in the amide I region is generated by tuning the diode laser probe source. The features in the IR difference spectrum are assigned to the motions of the polypeptide backbone associated with the global relaxation of the protein from the ligated to the deoxy conformation. A static difference spectrum generated by subtracting FTIR spectra of carbonmonoxy-Mb and deoxy-Mb is essentially identical to the transient spectrum, indicating that the protein relaxation is complete with the 100-ns time resolution of the experiment. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,MAIL STOP J567,LOS ALAMOS,NM 87545. FU NIGMS NIH HHS [GM 45807] NR 39 TC 30 Z9 30 U1 1 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 NOV 16 PY 1993 VL 32 IS 45 BP 11985 EP 11991 DI 10.1021/bi00096a007 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MG893 UT WOS:A1993MG89300007 PM 8218274 ER PT J AU EINARSDOTTIR, O DYER, RB LEMON, DD KILLOUGH, PM HUBIG, SM ATHERTON, SJ LOPEZGARRIGA, JJ PALMER, G WOODRUFF, WH AF EINARSDOTTIR, O DYER, RB LEMON, DD KILLOUGH, PM HUBIG, SM ATHERTON, SJ LOPEZGARRIGA, JJ PALMER, G WOODRUFF, WH TI PHOTODISSOCIATION AND RECOMBINATION OF CARBONMONOXYCYTOCHROME OXIDASE - DYNAMICS FROM PICOSECONDS TO KILOSECONDS SO BIOCHEMISTRY LA English DT Article ID TRANSFORM INFRARED-SPECTROSCOPY; C-OXIDASE; MONOXIDE BINDING; LIGAND-BINDING; OXYGEN; TEMPERATURE; DIOXYGEN; COMPLEX; COPPER; SITE AB The kinetics of the flash-induced photodissociation and rebinding of carbon monoxide in cytochrome aa3-CO have been studied by time-resolved infrared (TRIR) and transient ultraviolet-visible (UV-vis) spectroscopy at room temperature and by Fourier transform infrared (FTIR) spectroscopy at low temperature. The binding of photodissociated CO to Cu(B+) at room temperature is conclusively established by the TRIR absorption at 2061 cm-1 due to the C-O stretching mode of the Cu(B+)-CO complex. These measurements yield a first-order rate constant of (4.7 +/- 0.6) X 10(5) s-1 (t1/2 = 1.5 +/- 0.2 mus) for the dissociation of CO from the Cu(B+)-CO complex into solution. The rate of rebinding of flash-photodissociated CO to cytochrome a3(2+) exhibits saturation kinetics at [CO] > 1 mM due to a preequilibrium between CO in solution and the Cu(B+)-CO complex (K1 = 87 M-1), followed by transfer of CO to cytochrome a3(2+) (k2 = 1030 s-1). The CO transfer from Cu(B) to Fe(a3) was followed by CO-FTIR between 158 and 179 K and by UV-vis at room temperature. The activation parameters over the temperature range 140-300 K are DELTAH(double dagger) = 10.0 kcal mol-1 and DELTAS(double dagger) = -12.0 cal mol-1 K-1. The value of DELTAH(double dagger) is temperature independent over this range; i.e., DELTAC(p)double dagger = 0 for CO transfer. Rapid events following photodissociation and preceding rebinding of CO to cytochrome a3(2+) were observed. An increase in the alpha-band of cytochrome a3 near 615 nm (t1/2 ca. 6 ps) follows the initial femtosecond time-scale events accompanying photodissociation. Subsequently, a decrease is observed in the alpha-band absorbance (t1/2 approximately 1 mus) to a value typical of unliganded cytochrome a3. This latter absorbance change appears to occur simultaneously with the loss of CO by Cu(B+). We ascribe these observations to structural changes at the cytochrome a3 induced by the formation and dissociation of the Cu(B+)-CO complex. We suggest that the picosecond binding of photodissociated CO to Cu(B) triggers the release of a ligand L from Cu(B). We infer that L then binds to cytochrome a3 on the distal side and that this process is directly responsible for the observed alpha-band absorbance changes. We have previously suggested that the transfer of L produces a transient five-coordinate high-spin cytochrome a3 species where the proximal histidine has been replaced by L. When CO binds to the enzyme from solution, these processes are reversed. The dissociation of L from the heme is suggested to be the rate-determining step for transfer of CO from its preequilibrium binding site on Cu(B) to its thermodynamically stable binding site on the heme iron. These findings suggest an additional feature of the ''ligand shuttle'' role that we previously proposed for Cu(B) in the functional dynamics of cytochrome oxidase. We suggest that the ligand shuttle may occur during the binding of other small molecules, most notably O2, at the active site and that these ligand-exchange processes may represent a control and coupling mechanism for the electron-transfer and proton-translocation reactions of the enzyme. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV TEXAS,CTR FAST KINET RES,AUSTIN,TX 78712. RICE UNIV,DEPT BIOCHEM & CELL BIOL,HOUSTON,TX 77251. RP EINARSDOTTIR, O (reprint author), UNIV CALIF SANTA CRUZ,DEPT CHEM,SANTA CRUZ,CA 95064, USA. FU NCRR NIH HHS [RR 00886]; NIDDK NIH HHS [DK 36263]; NIGMS NIH HHS [GM 21337] NR 50 TC 111 Z9 112 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 16 PY 1993 VL 32 IS 45 BP 12013 EP 12024 DI 10.1021/bi00096a011 PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MG893 UT WOS:A1993MG89300011 PM 8218278 ER PT J AU JANSSENS, K VINCZE, L ADAMS, F JONES, KW AF JANSSENS, K VINCZE, L ADAMS, F JONES, KW TI SYNCHROTRON-RADIATION-INDUCED X-RAY-MICROANALYSIS SO ANALYTICA CHIMICA ACTA LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL SYMPOSIUM ON MICROCHEMICAL TECHNIQUES ( ISM 92 ) CY SEP 07-12, 1992 CL CORDOBA, SPAIN DE X-RAY FLUORESCENCE SPECTROMETRY; SYNCHROTRON RADIATION ID MICROPROBE; EMISSION AB The qualities and limitations of synchrotron radiation-induced x-ray microfluorescence (SRXRF) spectrometry are discussed in comparison with those of more conventional microchemical techniques such as secondary ion microscopy and electron probe microanalysis. Examples of the analysis of particulates and the two-dimensional mapping of elemental species are given. Two new developments in connection with SRXRF are discussed: the use of microscopic x-ray absorption spectrometry and the predicted performance of SRXRF spectrometers installed with third-generation synchrotron sources. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP JANSSENS, K (reprint author), UNIV INSTELLING ANTWERP,DEPT CHEM,UNIVERSITEITSPLEIN 1,B-2610 WILRIJK,BELGIUM. RI Janssens, Koen/B-8049-2011 OI Janssens, Koen/0000-0002-6752-6408 NR 34 TC 19 Z9 19 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD NOV 15 PY 1993 VL 283 IS 1 BP 98 EP 110 DI 10.1016/0003-2670(93)85213-4 PG 13 WC Chemistry, Analytical SC Chemistry GA MK028 UT WOS:A1993MK02800009 ER PT J AU GUIOCHON, GA AF GUIOCHON, GA TI CHROMATOGRAPHY, TODAY AND TOMORROW SO ANALYTICA CHIMICA ACTA LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL SYMPOSIUM ON MICROCHEMICAL TECHNIQUES ( ISM 92 ) CY SEP 07-12, 1992 CL CORDOBA, SPAIN DE CHROMATOGRAPHY; HISTORY OF CHROMATOGRAPHY ID PHASES AB The history of chromatography is briefly reviewed. Current trends are documented, pointing to the advanced degree of maturation of the method. Its future as a research area results from its unique position as an extremely powerful technique of investigation of the thermodynamics and kinetics of phase equilibria, in the same time as it is the most powerful method of separation available in the life sciences. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN. RP GUIOCHON, GA (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 28 TC 8 Z9 8 U1 5 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD NOV 15 PY 1993 VL 283 IS 1 BP 309 EP 319 DI 10.1016/0003-2670(93)85237-E PG 11 WC Chemistry, Analytical SC Chemistry GA MK028 UT WOS:A1993MK02800034 ER PT J AU GRATE, JW MARTIN, SJ WHITE, RM AF GRATE, JW MARTIN, SJ WHITE, RM TI ACOUSTIC-WAVE MICROSENSORS .2. SO ANALYTICAL CHEMISTRY LA English DT Article ID QUARTZ-CRYSTAL MICROBALANCE; LIQUID-PHASE; PATTERN-RECOGNITION; CHEMICAL SENSORS; VAPOR SENSORS; GAS SENSOR; DEVICES; MASS; RESPONSES; ARRAY C1 SANDIA NATL LABS, DEPT MICROSENSOR RES & DEV, ALBUQUERQUE, NM 87185 USA. UNIV CALIF BERKELEY, BERKELEY SENSOR & ACTUATOR CTR, DEPT ELECT ENGN & COMP SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, ELECTR RES LAB, BERKELEY, CA 94720 USA. RP PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 72 TC 111 Z9 113 U1 2 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1993 VL 65 IS 22 BP A987 EP A996 DI 10.1021/ac00070a002 PG 10 WC Chemistry, Analytical SC Chemistry GA MG545 UT WOS:A1993MG54500003 ER PT J AU WOLK, JA AGER, JW DUXSTAD, KJ HALLER, EE TASKAR, NR DORMAN, DR OLEGO, DJ AF WOLK, JA AGER, JW DUXSTAD, KJ HALLER, EE TASKAR, NR DORMAN, DR OLEGO, DJ TI LOCAL VIBRATIONAL-MODE SPECTROSCOPY OF NITROGEN-HYDROGEN COMPLEX IN ZNSE SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMICONDUCTORS; DEFECTS; EPITAXY; GROWTH AB Using infrared and Raman spectroscopy, we have observed two local vibrational modes related to H bonded to N accepters in ZnSe samples grown by metalorganic vapor phase epitaxy. We assign the new mode seen at 3194 cm(-1) to a N-H stretching vibrational mode and tentatively assign the mode found at 783 cm(-1) to a N-H wagging vibrational mode. Polarized Raman spectroscopy was used to determine that the symmetry of the defect complex is C-3 v, which implies that the H atom is in either a bonding or antibonding position. C1 UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. PHILIPS LABS, BRIARCLIFF MANOR, NY 10510 USA. RP LAWRENCE BERKELEY LAB, BERKELEY, CA USA. OI Ager, Joel/0000-0001-9334-9751 NR 15 TC 75 Z9 75 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 15 PY 1993 VL 63 IS 20 BP 2756 EP 2758 DI 10.1063/1.110325 PG 3 WC Physics, Applied SC Physics GA MG674 UT WOS:A1993MG67400014 ER PT J AU STRANE, JW STEIN, HJ LEE, SR DOYLE, BL PICRAUX, ST MAYER, JW AF STRANE, JW STEIN, HJ LEE, SR DOYLE, BL PICRAUX, ST MAYER, JW TI METASTABLE SIGEC FORMATION BY SOLID-PHASE EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID ALLOYS AB We report the synthesis and detailed structural characterization of SiGeC metastable alloys formed by solid phase epitaxial regrowth. Epitaxial layers with 0.7 and 1.4 at. % C are formed by 700 degrees C regrowth of multiple energy carbon implants into preamorphized Si0.86Ge0.14 layers on Si substrates. Transmission electron microscopy and Rutherford backscattering spectrometry show heteroepitaxial regrowth of Si1-x-yGexCy layers into the metastable diamond cubic phase. Fourier transform infrared spectroscopy verifies that the carbon occupies substitutional lattice sites. Double crystal x-ray diffraction measurements of Si1-x-yGexCy and Si1-yCy reference layers quantify the C-induced tensile strain component. This strain compensates for the compressive strain in the SiGe layers, and indicates a change in lattice constant per atomic fraction C in agreement with Vegard's law. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. ARIZONA STATE UNIV,CSSS,TEMPE,AZ 85287. RP STRANE, JW (reprint author), CORNELL UNIV,DEPT MS&E,ITHACA,NY 14850, USA. NR 14 TC 103 Z9 103 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 NOV 15 PY 1993 VL 63 IS 20 BP 2786 EP 2788 DI 10.1063/1.110334 PG 3 WC Physics, Applied SC Physics GA MG674 UT WOS:A1993MG67400024 ER PT J AU ZAKHAROV, ND LILIENTALWEBER, Z SWIDER, W BROWN, AS METZGER, R AF ZAKHAROV, ND LILIENTALWEBER, Z SWIDER, W BROWN, AS METZGER, R TI STRUCTURE OF GA0.47IN0.53AS EPITAXIAL LAYERS GROWN ON INP SUBSTRATES AT DIFFERENT TEMPERATURES SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; SEGREGATION AB The evolution of defect structures and surface reconstruction of Ga0.47In0.53As epitaxial layers grown by molecular beam epitaxy on InP substrate have been investigated by TEM and RHEED over a wide growth temperature range (150 degrees C less than or equal to T-g less than or equal to 450 degrees C) before and after annealing. In the growth temperature range 400 degrees C less than or equal to T-g less than or equal to 450 degrees C, extensive segregation of In near the layer surface takes place. The maximum of In concentration was found to lie under the layer surface. The kinetic of surface pit formation after annealing was explained in terms of surface reconstruction and As clustering. Extensive As clustering was observed after annealing for the growth temperature range 175 degrees C less than or equal to T-g less than or equal to 300 degrees C. Analysis of diffuse scattering and dark-field images made it possible to propose an atomic model of cluster structure. Precipitate formation close to the interface was observed only for the samples grown at 150 degrees C and annealed at 500 degrees C. Differences in electrical properties between LT-grown GaAs and Ga0.47In0.53As are explained in terms of the structural defects. C1 HUGHES RES LABS,MALIBU,CA 90265. RP ZAKHAROV, ND (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,62-203,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 12 TC 10 Z9 10 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 NOV 15 PY 1993 VL 63 IS 20 BP 2809 EP 2811 DI 10.1063/1.110294 PG 3 WC Physics, Applied SC Physics GA MG674 UT WOS:A1993MG67400032 ER PT J AU MCKEE, RA WALKER, FJ CONNER, JR RAJ, R AF MCKEE, RA WALKER, FJ CONNER, JR RAJ, R TI BASI2 AND THIN-FILM ALKALINE-EARTH SILICIDES ON SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID GROWTH; SI AB The epitaxial structural development and surface reactions of the alkaline earth metals with silicon have been studied as a function of surface coverage. The barium reaction has been characterized in detail from submonolayer structures to the thick film orthorhombic phase, BaSi2. From 0 to 1 monolayer a series of ordered surface structures develops that suggests a cubic Ba-Si compound. We have also shown that strontium, calcium, and magnesium develop these highly ordered submonolayer silicides. These submonolayer structures are the templates for the heteroepitaxial transition to alkaline earth containing oxides on silicon. C1 CORNELL UNIV,DEPT MAT SCI & ENGN,ITHACA,NY 14853. UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RP MCKEE, RA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI Walker, Frederick/0000-0002-8094-249X NR 13 TC 78 Z9 82 U1 2 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 NOV 15 PY 1993 VL 63 IS 20 BP 2818 EP 2820 DI 10.1063/1.110297 PG 3 WC Physics, Applied SC Physics GA MG674 UT WOS:A1993MG67400035 ER PT J AU ALJURF, M NARLA, M FUCHAROEN, S BUNYARATVEJ, A SCHRIER, SL AF ALJURF, M NARLA, M FUCHAROEN, S BUNYARATVEJ, A SCHRIER, SL TI VOLUME AND CELLULAR MATERIAL PROPERTIES OF HB-CONSTANT SPRING (CS) SO BLOOD LA English DT Meeting Abstract C1 SIRIRAJ HOSP,CTR THALASSEMIA,BANGKOK 7,THAILAND. RAMATHIBODI HOSP,DEPT PATHOL,BANGKOK 4,THAILAND. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. STANFORD UNIV,DIV HEMATOL,STANFORD,CA 94305. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A223 EP A223 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200876 ER PT J AU BALLAS, SK SORETTE, M GREENBAUM, A MOHANDAS, N AF BALLAS, SK SORETTE, M GREENBAUM, A MOHANDAS, N TI OBJECTIVE EVALUATION OF SICKLING-INDUCED FRAGMENTATION IN-VIVO SO BLOOD LA English DT Meeting Abstract C1 CARDEZA FDN,PHILADELPHIA,PA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A353 EP A353 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201394 ER PT J AU BARTON, JC PATTON, MA EDWARDS, CO GRIFFEN, LM KUSHNER, JP MEEKS, RG LEGGETT, RW AF BARTON, JC PATTON, MA EDWARDS, CO GRIFFEN, LM KUSHNER, JP MEEKS, RG LEGGETT, RW TI BLOOD LEAD CONCENTRATIONS IN HEMOCHROMATOSIS SO BLOOD LA English DT Meeting Abstract C1 UNIV ALABAMA,BIRMINGHAM,AL 35233. VET ADM MED CTR,BIRMINGHAM,AL 35233. LATTER DAY ST HOSP,SALT LAKE CITY,UT 84143. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A95 EP A95 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200366 ER PT J AU BOOKCHIN, RM ETZION, Z SORETTE, MP MOHANDAS, N LEW, VL AF BOOKCHIN, RM ETZION, Z SORETTE, MP MOHANDAS, N LEW, VL TI HETEROGENEITY OF ION-TRANSPORT IN SICKLE-CELL-ANEMIA RETICULOCYTES (SS RETICS) REVEALED BY PATTERNS OF ACID-INDUCED DEHYDRATION SO BLOOD LA English DT Meeting Abstract C1 YESHIVA UNIV ALBERT EINSTEIN COLL MED,BRONX,NY 10461. MILES INC,TARRYTOWN,NY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PHYSIOL LAB,CAMBRIDGE CB2 3EG,ENGLAND. NR 1 TC 4 Z9 4 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A350 EP A350 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201383 ER PT J AU CHASIS, JA MCGEE, S ANSTEE, D MOHANDAS, N AF CHASIS, JA MCGEE, S ANSTEE, D MOHANDAS, N TI DIFFERENT TRANSMEMBRANE SIGNALING MECHANISMS MEDIATED BY BAND-3 AND GLYCOPHORIN-A SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. INT BLOOD GRP REFERENCE LAB,BRISTOL,ENGLAND. NR 0 TC 1 Z9 1 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A174 EP A174 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200682 ER PT J AU DISCHER, D KNOWLES, D MCGEE, S CHASIS, J PARRA, M CONBOY, J MOHANDAS, N AF DISCHER, D KNOWLES, D MCGEE, S CHASIS, J PARRA, M CONBOY, J MOHANDAS, N TI MECHANICAL LINKAGE BETWEEN RED-CELL SKELETON AND PLASMA-MEMBRANE IS NOT A DEMONSTRATED FUNCTION OF PROTEIN-4.1 SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. NR 1 TC 2 Z9 2 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A309 EP A309 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201218 ER PT J AU DISCHER, D EVANS, EA LEUNG, A MOHANDAS, N AF DISCHER, D EVANS, EA LEUNG, A MOHANDAS, N TI MOLECULAR MAPPING OF MEMBRANE REORGANIZATION DURING RED-CELL DEFORMATION SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV BRITISH COLUMBIA,VANCOUVER V6T 1W5,BC,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A3 EP A3 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200002 ER PT J AU DISCHER, D PARRA, M CONBOY, J MOHANDAS, N AF DISCHER, D PARRA, M CONBOY, J MOHANDAS, N TI IDENTIFICATION OF THE MINIMAL DOMAIN OF PROTEIN-4.1 INVOLVED IN SKELETAL INTERACTIONS SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A4 EP A4 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200003 ER PT J AU FABRY, ME SENGUPTA, A SUZUKA, SM COSTANTINI, F RUBIN, EM NAGEL, RL AF FABRY, ME SENGUPTA, A SUZUKA, SM COSTANTINI, F RUBIN, EM NAGEL, RL TI 2ND-GENERATION SICKLE TRANSGENIC MOUSE - THE EXPRESSION OF BOTH BETA-S AND BETA-S-ANTILLES IS MORE SEVERE THAN EITHER ALONE SO BLOOD LA English DT Meeting Abstract C1 YESHIVA UNIV ALBERT EINSTEIN COLL MED,DIV HEMATOL,BRONX,NY 10461. COLUMBIA UNIV,DEPT GENET & DEV,NEW YORK,NY 10027. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A178 EP A178 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200696 ER PT J AU GEE, SL MILLER, EJ AOYAGI, K CONBOY, JG AF GEE, SL MILLER, EJ AOYAGI, K CONBOY, JG TI MAMMALIAN ERYTHROID CDNAS HOMOLOGOUS TO YEAST RNA SPLICING FACTORS OF THE PUTATIVE RNA HELICASE DEAH BOX FAMILY SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A105 EP A105 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200405 ER PT J AU MOHANDAS, N CREMINS, J LANGLEY, R DOVER, G BALLAS, SK AF MOHANDAS, N CREMINS, J LANGLEY, R DOVER, G BALLAS, SK TI FETAL HEMOGLOBIN CONTENT IS AN IMPORTANT DETERMINANT OF THE STATE OF HYDRATION OF INDIVIDUAL SICKLE RED-CELLS SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MILES INC,TARRYTOWN,NY. JOHNS HOPKINS UNIV,SCH MED,BALTIMORE,MD 21205. CARDEZA FDN,PHILADELPHIA,PA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A178 EP A178 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200698 ER PT J AU TCHERNIA, G CYNOBER, T MIELOT, F PALAYSI, N CROISILIE, L MOHANDAS, N AF TCHERNIA, G CYNOBER, T MIELOT, F PALAYSI, N CROISILIE, L MOHANDAS, N TI HETEROGENEITY IN PATHOBIOLOGY OF RED-CELLS IN HEREDITARY SPHEROCYTOSIS - RELEVANCE TO VARIABLE CLINICAL EXPRESSION SO BLOOD LA English DT Meeting Abstract C1 DEPT HEMATOL BICETRE,LE KREMLIN BICETR,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A88 EP A88 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200335 ER PT J AU WINARDI, R DISCHER, D AOYAGI, K ZON, L MOHANDAS, N CONBOY, J AF WINARDI, R DISCHER, D AOYAGI, K ZON, L MOHANDAS, N CONBOY, J TI PROTEIN-4.1 GENE-EXPRESSION IN ERYTHROID AND NONERYTHROID TISSUES OF THE FROG XENOPUS-LAEVIS SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CHILDRENS HOSP BOSTON,BOSTON,MA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A309 EP A309 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201220 ER PT J AU CHEN, WYC AF CHEN, WYC TI THE THEORY OF COMPOSITIONALS SO DISCRETE MATHEMATICS LA English DT Article ID COMBINATORIAL THEORY; COALGEBRAS; VARIABLES; ANTIPODES; CALCULUS; ALGEBRA AB By introducing the notion of compositionals we obtain a combinatorial interpretation of plethysm of formal power series in infinitely many variables. The following related problems are studied: Polya's theorem on the plethysm of cycle indices, plethystic inverse, the inverse of a sequence of delta series, the plethystic analog of the partition lattice, the reduced incidence algebra of the plethystic lattice, and the plethystic Hopf algebra. We also introduce plethystic trees, enriched plethystic trees and plethystic Schroder trees. An involution for plethystic Schroder trees is devised, which leads to a combinatorial expansion for the plethystic inverse of a series f(x1, x2, ...) containing the factor x1. RP CHEN, WYC (reprint author), LOS ALAMOS NATL LAB,MAIL STOP B265,LOS ALAMOS,NM 87545, USA. NR 43 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-365X J9 DISCRETE MATH JI Discret. Math. PD NOV 15 PY 1993 VL 122 IS 1-3 BP 59 EP 87 DI 10.1016/0012-365X(93)90287-4 PG 29 WC Mathematics SC Mathematics GA MH017 UT WOS:A1993MH01700006 ER PT J AU QUEMERAIS, P CAMPBELL, DK RAIMBAULT, JL AUBRY, S AF QUEMERAIS, P CAMPBELL, DK RAIMBAULT, JL AUBRY, S TI QUANTUM TUNNELING EFFECTS IN THE SSH MODEL OF ELECTRON-PHONON INTERACTIONS SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article ID FRENKEL-KONTOROVA MODEL; SCHRIEFFER-HEEGER MODEL; DEVILS STAIRCASE; POLYACETYLENE; SUPERCONDUCTIVITY; TRANSITION; SYSTEMS; FLUCTUATIONS; ANALYTICITY; BREAKING AB We examine the Su-Schrieffer-Heeger (SSH) model of electron-phonon (e-p) interactions as an example of a theory in which commensurate and incommensurate bond-order wave (BOW) ground states are generated (in the quasi-one-dimensional (quasi 1-D) case) by an intersite e-p coupling. We focus primarily on the two-fold commensurate situation, in view of its applicability to the important quasi 1-D conducting polymer trans-polyacetylene (trans - (CH)x). Using a coherent state formalism to model the quantum fluctuation corrections to the adiabatic ground state, we study the quantum tunneling of the SSH ''solitons'' (viewed as discommensurations created in the two-fold commensurate ground state) and show that, as a result of this tunneling, the energy of the discommensurations can become negative for e-p couplings below a certain critical coupling. We argue that this negative defect energy is an indication of the instability of the underlying adiabatic commensurate BOW state. The critical e-p coupling for this transition depends on the phonon frequency and, for general commensurability, on the commensurability ratio. Thus, in real trans - (CH)x chains where the e-p coupling and the bare phonon frequency are fixed, the transition we describe can occur as a function of doping (which can change the effective commensurability) and may explain the BOW-to-quasimetal transition in doped (CH)x. For quasi-1-D systems, we also estimate the critical e-p couplings for the three-fold commensurate and incommensurate cases. We conclude by mentioning possible extensions of our approach and results to the new family of ''fullerenes'', C(n)(n greater-than-or-equal-to 60). C1 CNRS,F-38042 GRENOBLE 03,FRANCE. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. LOS ALAMOS NATL LAB,CNLS,COMP FACIL,LOS ALAMOS,NM 87544. LOS ALAMOS NATL LAB,ACL,COMP FACIL,LOS ALAMOS,NM 87544. RP QUEMERAIS, P (reprint author), INST LAUE LANGEVIN,AVE MARTYRS,BP 156,F-38042 GRENOBLE 03,FRANCE. RI Aubry, Serge/E-9379-2012 NR 39 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 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD NOV 15 PY 1993 VL 7 IS 25 BP 4289 EP 4303 DI 10.1142/S021797929300367X PG 15 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA MK090 UT WOS:A1993MK09000007 ER PT J AU JIANG, DT COULTHARD, I SHAM, TK LORIMER, JW FRIGO, SP FENG, XH ROSENBERG, RA AF JIANG, DT COULTHARD, I SHAM, TK LORIMER, JW FRIGO, SP FENG, XH ROSENBERG, RA TI OBSERVATIONS ON THE SURFACE AND BULK LUMINESCENCE OF POROUS SILICON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID X-RAY ABSORPTION; EMISSION; SPECTRA AB Using the x-ray excited optical luminescence technique, we have investigated the soft x-ray induced photoluminescence of porous silicon in the optical region (200-900 nm) and the Si K-edge x-ray absorption fine structures of porous silicon in the near edge region. It is found that while porous silicon prepared at low current density (20 mA/cm2 for 20 min) exhibits a single broad luminescence band, porous silicon prepared at high current density (200 mA/cm2 for 20 min) exhibits three optical luminescence channels; i.e., in addition to the broad peak characteristic of all porous silicon, there are at least two additional optical luminescence channels at shorter wavelengths, one with modest intensity at approximately 460 nm and the other a weak and very broad peak at approximately 350 nm. These optical channels have been used to monitor the Si K-edge absorption of porous silicon in the near edge structure region. Analysis of the data shows that while the band at approximately 627.5 nm corresponds to the bulk emission, the other channels are of a surface origin. These observations and their implications are discussed. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,CANADIAN SYNCHROTRON RADIAT FACIL,STOUGHTON,WI 53589. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP JIANG, DT (reprint author), UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. RI Rosenberg, Richard/K-3442-2012 NR 22 TC 46 Z9 47 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1993 VL 74 IS 10 BP 6335 EP 6340 DI 10.1063/1.355156 PG 6 WC Physics, Applied SC Physics GA MF840 UT WOS:A1993MF84000066 ER PT J AU GRONBECHJENSEN, N BLACKBURN, JA AF GRONBECHJENSEN, N BLACKBURN, JA TI HYPERRADIANCE FROM SOLITON OSCILLATORS SYNCHRONIZED BY CAPACITIVE OR INDUCTIVE COUPLING SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID SINE-GORDON SYSTEMS; JOSEPHSON-JUNCTIONS; PHASE-LOCKING; DYNAMICS AB The output power from coupled Josephson oscillators is investigated when the junctions are operated in their single fluxon mode. We demonstrate that both inductive and capacitive coupling mechanisms can give rise to hyperradiance when the power is coupled out through a boundary resistor. Analytical expressions are derived from adiabatic perturbation theory and excellent agreement is found between the analytical expression and numerical simulations. C1 WILFRID LAURIER UNIV,DEPT PHYS & COMP,WATERLOO N2L 3C5,ONTARIO,CANADA. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1993 VL 74 IS 10 BP 6432 EP 6434 PG 3 WC Physics, Applied SC Physics GA MF840 UT WOS:A1993MF84000084 ER PT J AU CHANG, YJ CASTNER, EW AF CHANG, YJ CASTNER, EW TI FAST RESPONSES FROM SLOWLY RELAXING LIQUIDS - A COMPARATIVE-STUDY OF THE FEMTOSECOND DYNAMICS OF TRIACETIN, ETHYLENE-GLYCOL, AND WATER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IMPULSIVE STIMULATED SCATTERING; ELECTRON-TRANSFER; MOLECULAR-DYNAMICS; AQUEOUS-SOLUTIONS; RAMAN-SCATTERING; FREQUENCY; SOLVATION; SPECTROSCOPY; ULTRAFAST; SOLVENTS AB We have measured the ultrafast solvent relaxation of liquid ethylene glycol, triacetin, and water by means of femtosecond polarization spectroscopy, using optical-heterodyne-detected Raman-induced Kerr-effect spectroscopy. In the viscous liquids triacetin and ethylene glycol, femtosecond relaxation processes were resolved. Not surprisingly, the femtosecond nonlinear optical response of ethylene glycol is quite similar to that of water. Using the theory of Maroncelli, Kumar, and Papazyan, we transform the pure-nuclear solvent response into a dipolar-solvation correlation function for comparison with ultrafast electron-transfer reaction rates. RP CHANG, YJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,BLDG 555A,UPTON,NY 11973, USA. NR 48 TC 199 Z9 201 U1 1 U2 15 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 NOV 15 PY 1993 VL 99 IS 10 BP 7289 EP 7299 DI 10.1063/1.465710 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MH744 UT WOS:A1993MH74400001 ER PT J AU KING, JC ZHANG, JZ SCHWARTZ, BJ HARRIS, CB AF KING, JC ZHANG, JZ SCHWARTZ, BJ HARRIS, CB TI VIBRATIONAL-RELAXATION OF M(CO)6 (M=CR, MO, W) - EFFECT OF METAL MASS ON VIBRATIONAL COOLING DYNAMICS AND NON-BOLTZMANN INTERNAL ENERGY-DISTRIBUTIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PHOTOGENERATED CR(CO)5(ROH); INFRARED-SPECTROSCOPY; TRANSIENT ABSORPTION; FLASH-PHOTOLYSIS; CONDENSED PHASE; CR(CO)6; ULTRAFAST; PHOTODISSOCIATION; PHOTOCHEMISTRY; RECOMBINATION AB The vibrational relaxation dynamics following the dissociation of C=O from M(CO)6 (M=Cr, Mo, W) have been studied with picosecond transient absorption spectroscopy. After dissociation of C=O, the pentacarbonyl species forms a complex with a solvent molecule. The cooling of these solvated pentacarbonyl complexes was monitored from 1 ps to 1 ns and different rates for vibrational relaxation were found for each of these three compounds. The W (CO)5 . (S=cyclohexane) vibrationally relaxes in 35 ps, whereas Mo (CO)5 . S relaxes twice as quickly, 18 ps. This result is surprising because the higher density of states in W (CO)5 . S would be expected to lead to faster cooling of the hot solvated complex. The primary cooling of Cr (CO)5 . S is completed in 18 ps just as in Mo (CO)5 . S, but a slower cooling of approximately 150 ps is also present. This component is assigned to vibrational relaxation of the C=O stretching mode. From comparisons with other studies, it appears that the existence of this slower cooling component is present only in first row transition metal carbonyls. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP KING, JC (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. OI Schwartz, Benjamin/0000-0003-3257-9152 NR 25 TC 50 Z9 50 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 NOV 15 PY 1993 VL 99 IS 10 BP 7595 EP 7601 DI 10.1063/1.465689 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MH744 UT WOS:A1993MH74400032 ER PT J AU KAPLAN, T AZIZ, MJ GRAY, LJ AF KAPLAN, T AZIZ, MJ GRAY, LJ TI RESTRICTED APPLICABILITY OF ONSAGER RECIPROCITY RELATIONS TO MODELS OF INTERFACE MOTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DIFFUSIONLESS SOLIDIFICATION; SOLUTE-DRAG; TRANSITION; ALLOYS; SEGREGATION; EQUILIBRIUM; SILICON; GROWTH AB Onsager's reciprocity relations have been applied to the motion of a planar interface in a phase transformation in a two-component system, in order to provide a test of kinetic models of alloy solidification. Although applicable to such models in general, Onsager's relations yield no information for a subclass of models in which the thermodynamic driving forces are linearly dependent to first order, as is the case for several models of alloy solidification including the continuous growth model (CGM) of Aziz and Kaplan. As a consequence, experimental tests will likely be required to distinguish between these models. If the CGM is generalized to include diffusion in the growing phase, Onsager's relations are applicable under some circumstances. C1 HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. RP KAPLAN, T (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 27 TC 12 Z9 12 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 NOV 15 PY 1993 VL 99 IS 10 BP 8031 EP 8037 DI 10.1063/1.465628 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MH744 UT WOS:A1993MH74400077 ER PT J AU WANNINKHOF, R ASHER, W WEPPERNIG, R CHEN, H SCHLOSSER, P LANGDON, C SAMBROTTO, R AF WANNINKHOF, R ASHER, W WEPPERNIG, R CHEN, H SCHLOSSER, P LANGDON, C SAMBROTTO, R TI GAS TRANSFER EXPERIMENT ON GEORGES BANK USING 2 VOLATILE DELIBERATE TRACERS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID AIR-WATER-INTERFACE; SULFUR-HEXAFLUORIDE; SOLUBLE GASES; EXCHANGE; FLUX; BUBBLES AB A gas exchange experiment was performed on Georges Bank using deliberate tracers sulfur hexafluoride (SF6) and helium 3(He-3). The concentrations of the tracers were measured in the water column over a period of 10 days. During this time the patch grew from an 8-km-long injection streak to an area of about 500 km2. The ps transfer velocity was determined from the change in the ratio of the tracers over time scaled to the ratio of their Schmidt numbers. A near-linear relationship between gas exchange and wind speed was observed based on four experimental points covering a wind speed range from 3 to 11 m/s. The results fall in the upper part of the range of gas transfer-wind speed relationships developed to date. Wind speeds during the experiment obtained from anemometers on the ship, on a free floating drifter, and on a fixed mooring showed significant differences. With the ability to measure gas transfer velocities over the ocean on timescales of several days, accurate wind speed/stress measurements are imperative to obtain a robust relationship between gas transfer and wind speed. C1 COLUMBIA UNIV, LAMONT DOHERTY GEOL OBSERV, PALISADES, NY 10964 USA. PACIFIC NW LAB, MARINE SCI LAB, SEQUIM, WA USA. RI Schlosser, Peter/C-6416-2012; Chen, Hua/B-7664-2014 OI Schlosser, Peter/0000-0002-6514-4203; Chen, Hua/0000-0002-9493-6939 NR 37 TC 80 Z9 81 U1 0 U2 12 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 NOV 15 PY 1993 VL 98 IS C11 BP 20237 EP 20248 DI 10.1029/93JC01844 PG 12 WC Oceanography SC Oceanography GA MH750 UT WOS:A1993MH75000013 ER PT J AU BERNSTEIN, A BIENZ, T CALDWELL, A CHEN, L DERRICK, M GIALAS, I HAMRI, A IMLAY, R KARTIK, S KIM, HJ KINNEL, T KREUTZMANN, H LI, CG LIM, JN LOVELESS, R LU, B MALLIK, U MCLEAN, KW MCNEIL, R METCALF, W MUSGRAVE, B OH, BY PARK, S PARSONS, JA REEDER, D REPOND, J RITZ, S ROCO, MTP SANDLER, PH SCIULLI, F SMITH, WH TALAGA, RL TZANAKOS, G WAI, L WANG, MZ WHITMORE, J WU, J YANG, S AF BERNSTEIN, A BIENZ, T CALDWELL, A CHEN, L DERRICK, M GIALAS, I HAMRI, A IMLAY, R KARTIK, S KIM, HJ KINNEL, T KREUTZMANN, H LI, CG LIM, JN LOVELESS, R LU, B MALLIK, U MCLEAN, KW MCNEIL, R METCALF, W MUSGRAVE, B OH, BY PARK, S PARSONS, JA REEDER, D REPOND, J RITZ, S ROCO, MTP SANDLER, PH SCIULLI, F SMITH, WH TALAGA, RL TZANAKOS, G WAI, L WANG, MZ WHITMORE, J WU, J YANG, S TI BEAM TESTS OF THE ZEUS BARREL CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CONSTRUCTION; DESIGN AB A fully compensating uranium-scintillator calorimeter was constructed for the ZEUS detector at HERA. Several of the barrel calorimeter modules were subjected to beam tests at Fermilab before shipping them to DESY for installation. The calibrations of the modules used beams of electrons and hadrons, measuring the uniformity of the response, and checking the resolution. The runs also provided opportunity to test a large fraction of the actual ZEUS calorimeter readout system in an integrated beam environment more than one year before HERA turn on. The experiment utilized two computer controlled mechanical structures. one of which was capable of holding up to four modules in order to study shower containment, and a magnetic spectrometer with a high resolution beam tracking system. During two running periods, beams of 6 to 110 GeV containing e, mu, pi, and pBAR were used. The results show energy resolutions of 35%/square-root E for hadrons and 19%/square-root E for electrons, uniformities at the 1% level, energy nonlinearity less than 1%, and equal response for electrons and hadrons. C1 NEVIS LABS,IRVINGTON,NY. COLUMBIA UNIV,NEW YORK,NY 10027. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV WISCONSIN,MADISON,WI 53706. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. OHIO STATE UNIV,COLUMBUS,OH 43210. PENN STATE UNIV,UNIV PK,PA 16802. RP BERNSTEIN, A (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 24 TC 217 Z9 217 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 23 EP 52 DI 10.1016/0168-9002(93)91078-2 PG 30 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600005 ER PT J AU KAPLAN, DM APOLINSKI, M LUEBKE, W KWAN, SWL AF KAPLAN, DM APOLINSKI, M LUEBKE, W KWAN, SWL TI A SIMPLE DRIFT-TUBE TELESCOPE FOR DETECTOR TESTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have constructed and operated a telescope consisting of eight drift tubes with 60-degrees stereo covering an aperture of 6.5 cm2. The telescope provides position resolution of almost-equal-to 100 mum rms and angular resolution of almost-equal-to 1/3 mrad. The small amount of electronics required and the relative simplicity of calibration make this an attractive approach for instrumenting detector tests when good positional and angular resolution are needed. C1 FERMILAB NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510. RP KAPLAN, DM (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 116 EP 121 DI 10.1016/0168-9002(93)91085-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600012 ER PT J AU ALSMILLER, RG ALSMILLER, FS AF ALSMILLER, RG ALSMILLER, FS TI LOW-ENERGY PARTICLE-PRODUCTION AND TRANSPORT FOR 200 GEV/C HADRONS IN LEAD AND COMPARISONS WITH EXPERIMENTAL-DATA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Calculated results for 200 GeV/c hadrons incident on a large lead target are presented and compared with experimental data. The calculations were carried out using the hadron transport code HETC88. Calculated results carried out with the hadron transport code FLUKA92 by Fasso et al., are also presented for comparison purposes. The quantities that are compared are the production per unit volume of F-18 and Na-24 in aluminum, P-32 in sulphur, and In-115m indium as a function of depth and radius in the target. The production of Na-24, P-32, and In-115m are due primarily to low energy ( < 20 MeV) neutrons and thus the comparisons here test the capabilities of HETC88 and FLUKA92 for producing and transporting these low energy neutrons. The calculated results from both HETC88 and FLUKA92 are in fair agreement with the experimental data for F-18, Na-24, and P-32, but do not agree well with the experimental data for the production of In-115m. The two sets of calculated results are in good agreement with each other at most depths and radii and exhibit approximately the same overall agreement with the experimental data. RP ALSMILLER, RG (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 132 EP 135 DI 10.1016/0168-9002(93)91088-5 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600015 ER PT J AU METLAY, MP SALADIN, JX LEE, IY DIETZSCH, O AF METLAY, MP SALADIN, JX LEE, IY DIETZSCH, O TI THE ICEBALL - A MULTIPLE ELEMENT ARRAY FOR IN-BEAM INTERNAL-CONVERSION ELECTRON-SPECTROSCOPY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID GAMMA-RAY AB The construction and testing of a multiple-element mini-orange spectrometer array, the Pitt ICEBall, is described. The performance of the array in tests with sources and in in-beam studies is discussed, and the questions of gamma-ray, delta-ray and secondary electron background are addressed. The ICEBall has a maximum efficiency of 18% of 4pi, in a compact package capable of inclusion within large gamma-detector arrays such as the Oak Ridge Spin Spectrometer. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV SAO PAULO,INST FIS,SAO PAULO,BRAZIL. RP METLAY, MP (reprint author), UNIV PITTSBURGH,DEPT PHYS & ASTRON,PITTSBURGH,PA 15260, USA. NR 10 TC 17 Z9 17 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 NOV 15 PY 1993 VL 336 IS 1-2 BP 162 EP 170 DI 10.1016/0168-9002(93)91092-2 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600019 ER PT J AU WENDER, SA BALESTRINI, S BROWN, A HAIGHT, RC LAYMON, CM LEE, TM LISOWSKI, PW MCCORKLE, W NELSON, RO PARKER, W HILL, NW AF WENDER, SA BALESTRINI, S BROWN, A HAIGHT, RC LAYMON, CM LEE, TM LISOWSKI, PW MCCORKLE, W NELSON, RO PARKER, W HILL, NW TI A FISSION IONIZATION DETECTOR FOR NEUTRON-FLUX MEASUREMENTS AT A SPALLATION SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The construction of a neutron flux monitor that can measure absolute neutron intensities in the neutron energy range from below 1 MeV to over 500 MeV is described. The detector consists of an ionization chamber with several thin deposits of fissionable material. The ionization chamber is thin enough that it does not significantly affect the neutron beam and may be left in the neutron flight path during experimental measurements to continuously monitor the beam flux. The use of this monitor at the continuous-energy spallation neutron source at the WNR target area at LAMPF is described. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP WENDER, SA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 5 TC 118 Z9 118 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 226 EP 231 DI 10.1016/0168-9002(93)91102-S PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600029 ER PT J AU GAVRON, A AF GAVRON, A TI MULTIPLE-SCATTERING CALCULATIONS IN PARTICLE-TRANSPORT CODES USING TRUNCATED RUTHERFORD SCATTERING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Multiple Coulomb scattering is incorporated into numerous particle transport codes using various approximation techniques. We present a new technique that incorporates the Rutherford scattering process directly into the transport code as an additional interaction process. We avoid divergent values of the cross section by introducing a cutoff angle, and examine the effect of its value on the results we obtain. RP GAVRON, A (reprint author), LOS ALAMOS NATL LAB,NEUTRON & NUCL SCI GRP,LOS ALAMOS,NM 87545, USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 269 EP 272 DI 10.1016/0168-9002(93)91108-Y PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600035 ER PT J AU SUORTTI, P THOMLINSON, W CHAPMAN, D GMUR, N SIDDONS, DP SCHULZE, C AF SUORTTI, P THOMLINSON, W CHAPMAN, D GMUR, N SIDDONS, DP SCHULZE, C TI A SINGLE-CRYSTAL BENT LAUE MONOCHROMATOR FOR CORONARY ANGIOGRAPHY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SYNCHROTRON RADIATION; SYSTEM AB A new monochromator has been developed for the human coronary angiography Project at the National Synchrotron Light Source. it is a single bent crystal of silicon in the Laue transmission geometry. The design, testing and use of this monochromator in a human imaging procedure will be discussed. C1 BROOKHAVEN NATL LAB,NSLS,UPTON,NY 11973. RP SUORTTI, P (reprint author), ESRF,BP 220,F-38043 GRENOBLE,FRANCE. RI Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 NR 18 TC 45 Z9 47 U1 0 U2 11 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 NOV 15 PY 1993 VL 336 IS 1-2 BP 304 EP 309 DI 10.1016/0168-9002(93)91114-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600041 ER PT J AU TATCHYN, R AF TATCHYN, R TI SIMPLE APPROXIMATIONS TO TRANSVERSE WIGGLER SPECTRA INTEGRATED OVER FINITE APERTURES IN THE WIGGLE PLANE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Simple approximations to conventional transverse wiggler spectra integrated over finite apertures in the wiggle plane are derived. Account is taken of the departure of the wiggler's on-axis field profile from an idealized sinusoidal shape. By introducing a generalization of the conventional K parameter, it is shown that the approximations can be formulated from a Fourier decomposition of the wiggler's dominant field profile in the direction of particle motion without explicit reference to the particle beam trajectory. Use of the generalized K parameter for estimating the first harmonic output energies of undulators and the critical energies of wigglers is examined. RP TATCHYN, R (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 5 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 361 EP 367 DI 10.1016/0168-9002(93)91121-3 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600048 ER PT J AU BLATTER, G FEIGELMAN, MV GESHKENBEIN, VB LARKIN, AI VINOKUR, VM AF BLATTER, G FEIGELMAN, MV GESHKENBEIN, VB LARKIN, AI VINOKUR, VM TI VORTICES IN HIGH-TEMPERATURE SUPERCONDUCTORS - THE STATISTICAL-MECHANICS AND DYNAMICS OF STRINGS SO PHYSICA A LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL BAR-ILAN CONFERENCE ON FRONTIERS IN CONDENSED MATTER PHYSICS CY MAR 15-18, 1993 CL BAR-ILAN UNIV, DEPT PHYS, RAMAT GAN, ISRAEL SP JACK & PEARL RESNICK INST ADV TECHNOL HO BAR-ILAN UNIV, DEPT PHYS ID HIGH-TC SUPERCONDUCTORS; DISTORTED VORTEX LATTICE; II SUPERCONDUCTORS; MAGNETIC-FIELD; THERMAL FLUCTUATIONS; SCALING APPROACH; ORDER PARAMETER; FLUX LINES; CREEP; PHASE AB We briefly discuss a selection of the most pertinent features in the phenomenology of high temperature superconductors. We concentrate on the continuous anisotropic case with results appropriate for YBCO. C1 LD LANDAU THEORET PHYS INST,MOSCOW 117940,RUSSIA. WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. ARGONNE NATL LAB,ARGONNE,IL 60439. RP BLATTER, G (reprint author), SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND. RI Feigelman, Mikhail/M-4113-2013 NR 27 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 341 EP 350 DI 10.1016/0378-4371(93)90533-A PG 10 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800036 ER PT J AU VINOKUR, VM AF VINOKUR, VM TI VORTEX DYNAMICS AND CORRELATED DISORDER IN HIGH-T(C) SUPERCONDUCTORS SO PHYSICA A LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL BAR-ILAN CONFERENCE ON FRONTIERS IN CONDENSED MATTER PHYSICS CY MAR 15-18, 1993 CL BAR-ILAN UNIV, DEPT PHYS, RAMAT GAN, ISRAEL SP JACK & PEARL RESNICK INST ADV TECHNOL HO BAR-ILAN UNIV, DEPT PHYS ID COLUMNAR DEFECTS; CRYSTALS; IRRADIATION AB We develop a theory for the vortex motion in the presence of correlated disorder in the form of twin boundaries and columnar defects. Mapping vortex trajectories onto boson world lines enables us to establish the duality of the vortex transport in systems with correlated disorder and the hopping conductivity of charged particles in 2D systems. A glassy-like dynamics of the vortex lines with zero linear resistivity and strongly nonlinear current-voltage behavior as V is-proportional-to exp(-const/J(mu)) in a Bose glass state is predicted. RP VINOKUR, VM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 17 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 384 EP 394 DI 10.1016/0378-4371(93)90538-F PG 11 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800041 ER PT J AU THOMPSON, JR SUN, YR CHRISTEN, DK CIVALE, L MARWICK, AD HOLTZBERG, F AF THOMPSON, JR SUN, YR CHRISTEN, DK CIVALE, L MARWICK, AD HOLTZBERG, F TI VORTEX DYNAMICS IN YBACUO SINGLE-CRYSTALS WITH POINT-LIKE AND LINE-LIKE DEFECTS - FLUX-CREEP STUDIES SO PHYSICA A LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL BAR-ILAN CONFERENCE ON FRONTIERS IN CONDENSED MATTER PHYSICS CY MAR 15-18, 1993 CL BAR-ILAN UNIV, DEPT PHYS, RAMAT GAN, ISRAEL SP JACK & PEARL RESNICK INST ADV TECHNOL HO BAR-ILAN UNIV, DEPT PHYS ID HIGH-TEMPERATURE SUPERCONDUCTORS; II SUPERCONDUCTORS; COLUMNAR DEFECTS; CURRENT-DENSITY; IRREVERSIBILITY; IRRADIATION; DEPENDENCE AB Studies of vortex dynamics and pinning were conducted in irradiated Y1Ba2Cu3O7 single crystals by observing the decay of supercurrents with time. The materials contained either point-like defects from proton irradiation or line-like defects from irradiation with energetic heavy ions. Analysis of the first case gives clear support for collective creep theory. With linear defects, the experiments give evidence for thermal smearing of the vortex pinning potential at higher temperatures, as predicted theoretically. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP THOMPSON, JR (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 16 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 395 EP 402 DI 10.1016/0378-4371(93)90539-G PG 8 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800042 ER PT J AU WANG, J WATSON, GM OCKO, BM AF WANG, J WATSON, GM OCKO, BM TI UNIAXIAL INCOMMENSURATE PHASES AT THE AU(111) ELECTRODE SO PHYSICA A LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL BAR-ILAN CONFERENCE ON FRONTIERS IN CONDENSED MATTER PHYSICS CY MAR 15-18, 1993 CL BAR-ILAN UNIV, DEPT PHYS, RAMAT GAN, ISRAEL SP JACK & PEARL RESNICK INST ADV TECHNOL HO BAR-ILAN UNIV, DEPT PHYS ID SCANNING TUNNELING MICROSCOPY; RAY-SCATTERING MEASUREMENTS; UNDERPOTENTIAL DEPOSITION; ELECTROCHEMICAL-CELL; IODIDE ADSORPTION; DIFFRACTION; SURFACE; GOLD; RECONSTRUCTION; COMPRESSIBILITY AB The structure of the Au(111) electrode has been investigated using surface X-ray scattering (SXS) in a variety of electrolytes. Although the underlying gold layers have hexagonal symmetry, the top most gold layer forms a rectangular, uniaxial incommensurate (p x square-root 3) structure in the absence of specific adsorption. The (p x square-root 3) structure is also observed for bismuth and iodine adlayers, where p continuously changes with potential (electrocompressibility). RP WANG, J (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Wang, Jia/B-6346-2011 NR 24 TC 17 Z9 17 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 679 EP 687 DI 10.1016/0378-4371(93)90575-O PG 9 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800078 ER PT J AU WU, XZ OCKO, BM SIROTA, EB SINHA, SK DEUTSCH, M AF WU, XZ OCKO, BM SIROTA, EB SINHA, SK DEUTSCH, M TI A NEW SURFACE PHASE IN LIQUID NORMAL-ALKANES SO PHYSICA A LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL BAR-ILAN CONFERENCE ON FRONTIERS IN CONDENSED MATTER PHYSICS CY MAR 15-18, 1993 CL BAR-ILAN UNIV, DEPT PHYS, RAMAT GAN, ISRAEL SP JACK & PEARL RESNICK INST ADV TECHNOL HO BAR-ILAN UNIV, DEPT PHYS ID ORDER-DISORDER TRANSITIONS; CRYSTAL FILMS; LAYER GROWTH; MONOLAYERS AB A new surface phase is found in liquid normal-alkanes. X-ray and surface tension measurements show the formation of a crystalline monolayer on the surface of the liquid at temperatures up to 3-degrees-C above the bulk solidification temperature, T(f). The molecules in the monolayer are hexagonally packed and oriented normal to the surface. A single solid monolayer persists down to T(f), thus exhibiting a very limited partial wetting. The new surface phase is obtained only for chain lengths 14 < n less-than-or-equal-to 50. Its vanishing for n less-than-or-equal-to 14 is interpreted as a possible transition from surface freezing to surface melting behaviour. The measurements are satisfactorily accounted for within a simple theory based on surface energy considerations. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. RP WU, XZ (reprint author), EXXON RES & ENGN CO,CORP RES SCI LAB,ROUTE 22,ANNANDALE,NJ 08801, USA. RI Sirota, Eric/A-7633-2009 NR 16 TC 31 Z9 31 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 751 EP 758 DI 10.1016/0378-4371(93)90583-P PG 8 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800086 ER PT J AU CLEM, JR AF CLEM, JR TI EFFECTS OF ANISOTROPY AND LAYERING IN THE HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; LOWER CRITICAL-FIELD; II SUPERCONDUCTORS; MODEL; DEFECTS; STATE AB The key building blocks of the high-temperature copper-oxide superconductors are the CuO2 layers, on which superconductivity tends to be localized and along which the normal-state electrical conductivity is highest. Separating these layers (or bilayers, trilayers, etc.) are locally nonsuperconducting layers, which can be modeled as proximity junctions or tunnel junctions. In this paper I summarize some consequences of a theoretical model for strongly anisotropic high-temperature superconductors in which the interlayer regions are treated as Josephson junctions. In such a model, the vortex lines threading through the structure are best visualized as stacks of two-dimensional pancake vortices connected by Josephson strings. The two-dimensional pancake vortices are centered on the layers and have Abrikosov cores, while the Josephson strings are confined to the junctions and have Josephson cores. Outside the cores, the field and current distributions can be calculated from the anisotropic Ginzburg-Landau (or London) theory. Various features of the flux-pinning anisotropy can be explained using these approaches. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. RP IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. NR 19 TC 11 Z9 11 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 EI 1873-2119 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 118 EP 126 DI 10.1016/0378-4371(93)90510-B PG 9 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800013 ER PT J AU SIGALAS, M SOUKOULIS, CM ECONOMOU, EN CHAN, CT HO, KM AF SIGALAS, M SOUKOULIS, CM ECONOMOU, EN CHAN, CT HO, KM TI PHOTONIC BAND-GAPS AND DEFECTS IN 2 DIMENSIONS - STUDIES OF THE TRANSMISSION COEFFICIENT SO PHYSICAL REVIEW B LA English DT Article ID PERIODIC DIELECTRIC STRUCTURES; 2-DIMENSIONAL SQUARE; DISORDERED-SYSTEMS; LOCALIZATION; LATTICES; STATES; EXISTENCE; SOLIDS AB Using the transfer-matrix technique for the propagation of electromagnetic waves in dielectric structures, we calculate the transmission coefficient versus the frequency of the incident wave for different polarizations in two-dimensional periodic and/or random arrangements of dielectric cylinders. This technique has been applied to cases where the plane-wave method fails or becomes too time consuming, such as when the dielectric constant is frequency dependent or has a nonzero imaginary part, and when defects are present in an otherwise periodic system. For all the cases studied, the results compared well with experiment. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV CRETE,RES CTR CRETE FORTH,IRAKLION,GREECE. UNIV CRETE,DEPT PHYS,IRAKLION,GREECE. RP SIGALAS, M (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Economou, Eleftherios /E-6374-2010; Soukoulis, Costas/A-5295-2008 NR 26 TC 150 Z9 159 U1 0 U2 7 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 NOV 15 PY 1993 VL 48 IS 19 BP 14121 EP 14126 DI 10.1103/PhysRevB.48.14121 PG 6 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500010 ER PT J AU FAUL, J NEUHOLD, G LEY, L FRAXEDAS, J ZOLLNER, S RILEY, JD LECKEY, RCG AF FAUL, J NEUHOLD, G LEY, L FRAXEDAS, J ZOLLNER, S RILEY, JD LECKEY, RCG TI CONDUCTION-BAND STATES IN GASB(110) AND GAP(110) AT THE BRILLOUIN-ZONE CENTER SO PHYSICAL REVIEW B LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; SURFACE-STATE; PHOTOELECTRON-SPECTROSCOPY; CRITICAL-POINTS; SEMICONDUCTORS; GAP; DISPERSIONS; SHIFTS; INAS; INSB AB Angle-resolved constant-initial-state spectroscopy (ARCIS) from the valence-band maximum (VBM) as initial state was used to determine conduction-band energies at the GAMMA point up to 66 eV above the VBM for GaSb and GaP. With the help of nonlocal-empirical-pseudopotential (EPM) calculations, structure in the ARCIS spectra up to 17 eV can be assigned to particular interband transitions. The experimental results are discussed in light of our previous work on the conduction-band states of GaAs, InP, and InAs. Above 40 eV there appears to be no correspondence between conduction-band states as calculated in the EPM framework and structure in the spectra. Autoionizing resonances due to surface core excitons have been observed in both materials. From their energies a surface core-exciton binding energy of 0.6 eV for GaSb and 1.4 eV for GaP has been determined. C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. LA TROBE UNIV,DEPT PHYS,BUNDOORA,VIC 3083,AUSTRALIA. RP FAUL, J (reprint author), UNIV ERLANGEN NURNBERG,INST TECH PHYS,D-91058 ERLANGEN,GERMANY. RI Zollner, Stefan/B-4858-2012; Fraxedas, Jordi/G-3135-2013; Register, CMSS/G-7191-2015 OI Zollner, Stefan/0000-0001-7752-7941; Fraxedas, Jordi/0000-0002-2821-4831; NR 31 TC 3 Z9 3 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 NOV 15 PY 1993 VL 48 IS 19 BP 14301 EP 14308 DI 10.1103/PhysRevB.48.14301 PG 8 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500032 ER PT J AU SPRUNGER, PT PLUMMER, EW AF SPRUNGER, PT PLUMMER, EW TI INTERACTION OF HYDROGEN WITH THE AG(110) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID METAL-SURFACES; INDUCED RECONSTRUCTION; DESORPTION-KINETICS; ADSORPTION; CU(110); ENERGY; CHEMISORPTION; H-2; RELAXATIONS; ACTIVATION AB The interaction of atomic and molecular hydrogen with the (110) surface of silver has been studied using electron-energy-loss spectroscopy, thermal desorption spectroscopy, low-energy electron diffraction (LEED), and work-function measurements. No evidence for associative or dissociative chemisorption of H2 is observed at the substrate temperatures investigated (greater-than-or-equal-to 90 K). However, at 100 K, atomic hydrogen bonds in the [110BAR] troughs of the surface in tilted-trigonal sites. As a function of concentration, a sequence of lattice-gas superstructures is observed with LEED including (1 X 4), (1 X 3), (2 X 6), and (2 X 2) patterns. At saturation coverage, the work function increases by 0.22 eV. However, this phase is metastable; upon annealing, hydrogen desorption is accompanied by an irreversible transition to a new bonding geometry in which LEED shows a dim (1 X 2) superstructure. The desorption of molecular hydrogen is characterized by two overlapping peaks centered at approximately 155 K [6.9 kJ/mol] and approximately 180 K [9.9 kJ/mol] which obey first- and second-order kinetics, respectively. Various structural models and hydrogen site assignments are discussed in comparison with data for similar systems. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SPRUNGER, PT (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. NR 58 TC 28 Z9 28 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 NOV 15 PY 1993 VL 48 IS 19 BP 14436 EP 14446 DI 10.1103/PhysRevB.48.14436 PG 11 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500048 ER PT J AU XIA, B RUCKMAN, MW STRONGIN, M AF XIA, B RUCKMAN, MW STRONGIN, M TI PHOTOELECTRON STUDY OF YB/C-60 BILAYERS AND THE YB FULLERIDES FORMED AT THE INTERFACES SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; SOLID C60; PHOTOEMISSION; FULLERENES; STATES AB Photoelectron measurements were obtained for Yb-C60 and the results are compared to those reported for alkali-metal fullerides and Yb isolated in xenon or solid NH3. The valence photoelectron spectra for Yb deposited on C60 and C60 on Yb show changes in the Yb 4f peaks, and in the C60 valence states and a metal-induced state just above the Yb 4f bands. The position of this valence feature is near to that found for an analogous feature in the nonsuperconducting K6C60 fulleride. Similar features also appear when Yb is solvated in condensed ammonia. The appearance and binding energy of the Yb 4f levels argue that the Yb is largely divalent but has a small trivalent component. A comparison of the data for Yb-C60 with that for Yb clusters in xenon shows that the changes in the electronic state of the Yb are not those found for small Yb particles in a nonreactive matrix. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP XIA, B (reprint author), CUNY QUEENS COLL,DEPT PHYS,FLUSHING,NY 11367, USA. NR 25 TC 15 Z9 15 U1 1 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 NOV 15 PY 1993 VL 48 IS 19 BP 14623 EP 14628 DI 10.1103/PhysRevB.48.14623 PG 6 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500069 ER PT J AU ROSENWAKS, Y HANNA, MC LEVI, DH SZMYD, DM AHRENKIEL, RK NOZIK, AJ AF ROSENWAKS, Y HANNA, MC LEVI, DH SZMYD, DM AHRENKIEL, RK NOZIK, AJ TI HOT-CARRIER COOLING IN GAAS - QUANTUM-WELLS VERSUS BULK SO PHYSICAL REVIEW B LA English DT Note ID ENERGY-LOSS RATES; TIME-RESOLVED PHOTOLUMINESCENCE; MATCHED SUPERLATTICE ELECTRODES; PICOSECOND RELAXATION; STRAINED-LAYER; INJECTION; PHONONS; HETEROSTRUCTURES; SEMICONDUCTORS; RECOMBINATION AB Hot-electron cooling dynamics in photoexcited bulk and quantum-well GaAs Structures were determined using time-correlated single-photon counting of photoluminescence (PL) decay. Hot-electron cooling curves were generated from analyses of the time-resolved PL spectra. The time constant characterizing the hot-electron energy-loss rate, tau(avg), was then determined, taking into account electron degeneracy and the time dependence of the quasi-Fermi-level. This analysis was also applied to earlier data obtained by Pelouch et al. with the same samples, but based on PL up-conversion experiments with < 80 fs temporal resolution. Both sets of experiments and analyses show that the hot-electron cooling rate can be much slower in GaAs quantum wells compared (at the same photogenerated carrier density) to bulk GaAs when this density is above a critical value. This critical density was found to range from high 10(17) to low 10(18) cm-3, depending upon the experimental technique; at the highest carrier densities, values of tau(avg) for quantum wells were found to be many hundreds of ps. RP ROSENWAKS, Y (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 42 TC 102 Z9 104 U1 6 U2 36 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 NOV 15 PY 1993 VL 48 IS 19 BP 14675 EP 14678 DI 10.1103/PhysRevB.48.14675 PG 4 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500081 ER PT J AU DATTA, S CHAN, CT HO, KM SOUKOULIS, CM AF DATTA, S CHAN, CT HO, KM SOUKOULIS, CM TI EFFECTIVE DIELECTRIC-CONSTANT OF PERIODIC COMPOSITE STRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID PHOTONIC BAND STRUCTURES; PLANE-WAVE METHOD; MEDIA; CONDUCTIVITY AB Using a plane-wave-expansion method, we obtained expressions for the effective dielectric constants-of composite periodic dielectric materials as the long-wavelength limit of the photonic-band-structure problem. The effective dielectric constants of several classes of photonic-band-gap structures are computed and we found that in the long-wavelength limit, they can be isotropic, uniaxial, or biaxial, depending on the symmetry of the structure under consideration. We also found that the scalar wave approximation gives poor results for effective dielectric constants while the Maxwell-Garnett theory offers very good approximations in the low-filling-ratio regimes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP DATTA, S (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008 NR 22 TC 143 Z9 145 U1 0 U2 13 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 NOV 15 PY 1993 VL 48 IS 20 BP 14936 EP 14943 DI 10.1103/PhysRevB.48.14936 PG 8 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000015 ER PT J AU LI, QM PHILLIPS, P AF LI, QM PHILLIPS, P TI EFFECT OF QUANTUM HOPPING ON THE COULOMB GAP OF LOCALIZED-ELECTRONS IN DISORDERED-SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID LOW-TEMPERATURE TRANSPORT; GLASS AB In this paper, we use the coherent potential approximation to study the role quantum hopping plays on the Coulomb gap of insulating strongly correlated d = 2 and d = 3 dimensional systems. We find that substantial increase in the density of states at the Coulomb gap occurs only. when the ratio between the hopping integral t and the gap width B exceeds a critical value. We estimate that the hopping integral corresponding to the experimental condition n < n(c)/3 satisfies t/B < 0.05. For such values of t/B, quantum hopping brings about little change in the single particle density of states. The classical Coulomb gap therefore remains intact in both three and two dimensional systems, in contrast to a previous claim that the gap disappears for d = 2 systems. The implication of these results on experiments on doped semiconductors is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP LI, QM (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 20 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1993 VL 48 IS 20 BP 15035 EP 15039 DI 10.1103/PhysRevB.48.15035 PG 5 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000025 ER PT J AU PRICE, DL WILLS, JM COOPER, BR AF PRICE, DL WILLS, JM COOPER, BR TI LINEAR-MUFFIN-TIN-ORBITAL CALCULATION OF TAC(001) SURFACE RELAXATION SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; RIPPLED RELAXATION; NIAL(110) SURFACE; LATTICE-RELAXATION; METAL-SURFACES; CARBIDE; ENERGY; MGO; SYSTEMS; CRYSTAL AB Recent experimental work on the (001) surface of tantalum carbide has shown that this material is among the class of compounds which exhibit a marked rippling relaxation. We report here on a total-energy calculation of the relaxation of TaC(001), using a full-potential, linear-combination-of-muffin-tin-orbitals electronic-structure method. We obtain good agreement between calculated and experimental values for the degree of relaxation, and a detailed analysis of the physical mechanisms involved leads us to conclude that the nature of the rippled relaxation is determined primarily by the electrostatics associated with the bulk charge density. We also discuss other properties of the TaC(001) surface, including surface core-level shifts. C1 W VIRGINIA UNIV, DEPT PHYS, MORGANTOWN, WV 26506 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP MEMPHIS STATE UNIV, DEPT PHYS, MEMPHIS, TN 38152 USA. NR 31 TC 40 Z9 40 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1993 VL 48 IS 20 BP 15301 EP 15310 DI 10.1103/PhysRevB.48.15301 PG 10 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000058 ER PT J AU PRICE, DL COOPER, BR WILLS, JM AF PRICE, DL COOPER, BR WILLS, JM TI EFFECT OF CARBON VACANCIES ON CARBIDE WORK-FUNCTIONS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; SURFACE; TACX; WC AB The transition-metal carbides are commonly formed with a substantial density of carbon vacancies. Here we examine the effect of carbon vacancies on the surface properties, primarily the work functions, of HfC and TaC. The method used is a full-potential linear-muffin-tin-orbital formulation, with a super-cell approach for obtaining variations in the vacancy distribution. We find that the differing signs of the vacancy-induced changes in the work functions of HfC and TaC are essentially determined by the differing effect of vacancies on the relative position of the Fermi energies in the two materials. C1 W VIRGINIA UNIV,DEPT PHYS,MORGANTOWN,WV 26506. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP PRICE, DL (reprint author), MEMPHIS STATE UNIV,DEPT PHYS,MEMPHIS,TN 38152, USA. NR 13 TC 15 Z9 15 U1 1 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 NOV 15 PY 1993 VL 48 IS 20 BP 15311 EP 15315 DI 10.1103/PhysRevB.48.15311 PG 5 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000059 ER PT J AU HELGESEN, G GIBBS, D BADDORF, AP ZEHNER, DM MOCHRIE, SGJ AF HELGESEN, G GIBBS, D BADDORF, AP ZEHNER, DM MOCHRIE, SGJ TI X-RAY REFLECTIVITY OF THE CU(11O) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; COPPER 110 SURFACE; ROUGHENING TRANSITION; ION-SCATTERING; ENHANCED ANHARMONICITY; OSCILLATORY RELAXATION; COMPUTER-SIMULATION; DISORDER; AG(110) AB The specular reflectivity from the (110) surface of a Cu single crystal has been measured for temperatures between 300 and 1100 K. At lower temperatures, the reflectivity is well described by a model which yields a contraction of the spacing between the first and the second surface layers by 8% relative to the bulk layer separation. The fits also show large surface-normal vibrational amplitudes within the first few atomic layers. The line shape of the scattering transverse to the specular direction has two components below 1000 K, and evolves with increasing temperature. However, our data do not preclude the existence of a surface-roughening transition. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. MASSACHUSETTS INST TECHNOL,DEPT PHYS,CAMBRIDGE,MA 02139. RP HELGESEN, G (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Baddorf, Arthur/I-1308-2016 OI Baddorf, Arthur/0000-0001-7023-2382 NR 35 TC 30 Z9 30 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 NOV 15 PY 1993 VL 48 IS 20 BP 15320 EP 15325 DI 10.1103/PhysRevB.48.15320 PG 6 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000061 ER PT J AU RUCKMAN, MW XIA, B QIU, SL AF RUCKMAN, MW XIA, B QIU, SL TI ADSORPTION OF C-60 ON TA(11O) - PHOTOEMISSION AND C-K-EDGE STUDIES SO PHYSICAL REVIEW B LA English DT Note ID ELECTRONIC-STRUCTURE; STATES; METAL; TRANSITION; ENERGY AB Photoelectron and near-edge spectroscopies are used to characterize a C-60 film on a Ta(110) surface. Like similar studies of C-60 on a variety of metal surfaces, the valence band, C 1s core level, and photoelectron-derived work-function measurements show that C-60 molecular states are aligned with the Fermi level and the charge is transferred from the metal to the fullerene. The photoelectron and near edge spectra of the C-60 peaks closest to the Fermi level show significant changes in intensity identifying those pi-like states as interacting with the substrate. A careful examination of the C 1s and Ta 4f core levels suggests that some fraction of the fullerene overlayer decomposes on the clean metal surface leading to or resulting in, a thin layer of carbon between the assembled film and the metal substrate. C1 FLORIDA ATLANTIC UNIV,DEPT PHYS,BOCA RATON,FL 33431. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 16 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1993 VL 48 IS 20 BP 15457 EP 15460 DI 10.1103/PhysRevB.48.15457 PG 4 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000080 ER PT J AU VADAS, SL AF VADAS, SL TI NUMERICAL EVOLUTION OF GENERAL-RELATIVISTIC VOIDS SO PHYSICAL REVIEW D LA English DT Article ID BIG-BUBBLE PROBLEM; EXTENDED INFLATION; EXPANDING UNIVERSE; 1ST-ORDER INFLATION; DOMINATED UNIVERSE; THIN SHELL; EXPANSION; RADIATION AB In this paper, we study the evolution of a superhorizon-sized void embedded in a radiation-dominated Friedmann-Robertson-Walker universe. We numerically solve the spherically symmetric general relativistic equations in comoving, synchronous coordinates. Initially, the fluid inside the void is taken to be homogeneous and nonexpanding. When the fluid inside the void is relativistic, we find that radiation diffuses into the void at approximately the speed of light as a strong shock-the void collapses in general. We also find the surprising result that the cosmic collapse time (the first-crossing time) for a relativistic or nonrelativistic void is much smaller than previously thought, because it depends not only on the initial void radius, but also on the ratio of the temperature inside the void (or the particle mass if the void is nonrelativistic) to the temperature outside. Under certain conditions (e.g., if the void is empty enough), the collapse occurs in less than the Hubble time outside the void. This quick collapse time revises the current picture of superhorizon-sized void evolution after first-order inflation. In addition, it introduces the possibility that superhorizon-sized voids may thermalize and homogenize relatively quickly. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. RP VADAS, SL (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. NR 44 TC 8 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 15 PY 1993 VL 48 IS 10 BP 4562 EP 4594 DI 10.1103/PhysRevD.48.4562 PG 33 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MJ061 UT WOS:A1993MJ06100009 ER PT J AU TURNER, MS WHITE, M LIDSEY, JE AF TURNER, MS WHITE, M LIDSEY, JE TI TENSOR PERTURBATIONS IN INFLATIONARY MODELS AS A PROBE OF COSMOLOGY SO PHYSICAL REVIEW D LA English DT Article ID MICROWAVE-BACKGROUND ANISOTROPY; COLD DARK MATTER; GRAVITATIONAL-WAVES; EXTENDED INFLATION; SCALE ANISOTROPIES; GRAND UNIFICATION; UNIVERSE; RADIATION; COBE; CONSTRAINTS AB In principle, the tensor metric (gravity-wave) perturbations that arise in inflationary models can, beyond probing the underlying inflationary model, provide information about the Universe: ionization history, presence of a cosmological constant, and epoch of matter-radiation equality. Because tensor perturbations give rise to the anisotropy of the cosmic background radiation (CBR) solely through the Sachs-Wolfe effect we are able to calculate analytically their contribution to the variance of the multipole moments of the CBR temperature anisotropy. In so doing, we carefully take account of the effect of tensor perturbations that entered the Hubble radius during both the matter-dominated and radiation-dominated epochs by means of a transfer function. (Previously, only those modes that entered during the matter era were properly taken into account.) The striking feature in the spectrum of multipole amplitudes is a dramatic falloff for 1 greater than or similar to square-root 1 + z(LSS), where z(LSS) is the redshift of the last-scattering surface, which depends upon the ionization history of the Universe. Finally, using our transfer function we provide a more precise formula for the energy density in stochastic gravitational waves from inflation, and, using the Cosmic Background Explorer Differential Microwave Radiometer (COBE DMR) quadrupole normalization, we express this energy density in terms of the ''tilt'' of the spectrum of tensor perturbations alone and show that it is unlikely that the stochastic background of gravity waves can be detected directly in the foreseeable future. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. RP TURNER, MS (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. RI White, Martin/I-3880-2015 OI White, Martin/0000-0001-9912-5070 NR 47 TC 113 Z9 113 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 15 PY 1993 VL 48 IS 10 BP 4613 EP 4622 DI 10.1103/PhysRevD.48.4613 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MJ061 UT WOS:A1993MJ06100013 ER PT J AU CALDWELL, RR AF CALDWELL, RR TI GREEN-FUNCTIONS FOR GRAVITATIONAL-WAVES IN FRW SPACETIMES SO PHYSICAL REVIEW D LA English DT Article AB A method for calculating the retarded Green's function for the gravitational wave equation in Friedmann-Robertson-Walker spacetimes within the formalism of linearized Einstein gravity is developed. Hadamard's general solution to Cauchy's problem for second-order, linear partial differential equations is applied to the FRW gravitational wave equation. The retarded Green's function may be calculated for any FRW spacetime, with curved or flat spatial sections, for which the functional form of the Ricci scalar curvature R is known. The retarded Green's function for gravitational waves propagating through a cosmological fluid composed of both radiation and dust is calculated analytically for the first time. It is also shown that for all FRW spacetimes in which the Ricci scalar curvatures does not vanish, R not-equal 0, the Green's function violates Huygens' principle; the Green's function has support inside the light cone due to the scattering of gravitational waves off the background curvature. RP CALDWELL, RR (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,POB 500,BATAVIA,IL 60510, USA. OI Caldwell, Robert/0000-0001-7490-7463 NR 27 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 15 PY 1993 VL 48 IS 10 BP 4688 EP 4692 DI 10.1103/PhysRevD.48.4688 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MJ061 UT WOS:A1993MJ06100022 ER PT J AU PAZ, JP MAHLER, G AF PAZ, JP MAHLER, G TI PROPOSED TEST FOR TEMPORAL BELL INEQUALITIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM-MECHANICS; MAGNETIC-FLUX; REALISM AB Temporal Bell inequalities can be violated for sequences of events (histories) for which probabilities satisfying consistent sum rules cannot be defined. We discuss possible experiments in which such violations, never observed so far, may indeed be seen. The basic scheme, which uses three optically driven and mutually interacting two-level systems, could be implemented in a variety of nanostructures. It could even be mapped onto the dynamics of a single electron four-level system thus allowing for a realization in atomic physics. C1 SANTA FE INST,SANTA FE,NM 87501. UNIV STUTTGART,INST THEORET PHYS & SYNERGET,W-7000 STUTTGART 80,GERMANY. RP PAZ, JP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Paz, Juan/C-5947-2008 NR 21 TC 38 Z9 38 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 NOV 15 PY 1993 VL 71 IS 20 BP 3235 EP 3239 DI 10.1103/PhysRevLett.71.3235 PG 5 WC Physics, Multidisciplinary SC Physics GA MG669 UT WOS:A1993MG66900001 ER PT J AU GONG, Y XUE, Q DAI, Z SLOUGH, CG COLEMAN, RV FALICOV, LM AF GONG, Y XUE, Q DAI, Z SLOUGH, CG COLEMAN, RV FALICOV, LM TI MODULATION OF THE CRYSTAL-STRUCTURE IN QUASI-ONE-DIMENSIONAL SOLIDS INDUCED BY IMPURITIES - AN ATOMIC-FORCE MICROSCOPE STUDY SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHARGE-DENSITY-WAVE; NBSE3 AB An atomic-force microscope study of interstitial impurities in the quasi-one-dimensional charge-density-wave system NbSe3 at room temperature (in the normal phase) exhibits long-range periodic lattice modulations. The amplitudes and wavelengths are strong functions of the impurity concentration, and in the case-of vanadium successive wavelengths of 6b0, 4b0, and 3b0 are observed. The drastic changes in the long-range structure of the system caused by small changes in the impurity concentration are an indication of the complex electric susceptibility of a system on the verge of becoming unstable against charge-density-wave formation. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP GONG, Y (reprint author), UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901, USA. NR 10 TC 11 Z9 11 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 15 PY 1993 VL 71 IS 20 BP 3303 EP 3306 DI 10.1103/PhysRevLett.71.3303 PG 4 WC Physics, Multidisciplinary SC Physics GA MG669 UT WOS:A1993MG66900018 ER PT J AU TANGYUNYONG, P THOMAS, RC HOUSTON, JE MICHALSKE, TA CROOKS, RM HOWARD, AJ AF TANGYUNYONG, P THOMAS, RC HOUSTON, JE MICHALSKE, TA CROOKS, RM HOWARD, AJ TI NANOMETER-SCALE MECHANICS OF GOLD-FILMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID THIN-FILMS AB We have used interfacial force microscopy (IFM) to monitor the mechanical deformation of single nanometer-size grains in Au thin films. Our results show that protruding grains, which represent early-stage delamination, display multiple deformation mechanisms including grain boundary sliding and intragranular plasticity. The unprecedented load-displacement control capability of the IFM provides data that are used for the first time to quantitatively distinguish and evaluate individual deformation processes. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87185. RP TANGYUNYONG, P (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 56 Z9 57 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 NOV 15 PY 1993 VL 71 IS 20 BP 3319 EP 3322 DI 10.1103/PhysRevLett.71.3319 PG 4 WC Physics, Multidisciplinary SC Physics GA MG669 UT WOS:A1993MG66900022 ER PT J AU NORMAN, MR AF NORMAN, MR TI EXISTENCE OF THE FFLO STATE IN SUPERCONDUCTING UPD2AL3 SO PHYSICAL REVIEW LETTERS LA English DT Editorial Material RP NORMAN, MR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Norman, Michael/C-3644-2013 NR 5 TC 47 Z9 47 U1 3 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 NOV 15 PY 1993 VL 71 IS 20 BP 3391 EP 3391 DI 10.1103/PhysRevLett.71.3391 PG 1 WC Physics, Multidisciplinary SC Physics GA MG669 UT WOS:A1993MG66900040 ER PT J AU LEADON, SA COOPER, PK AF LEADON, SA COOPER, PK TI PREFERENTIAL REPAIR OF IONIZING RADIATION-INDUCED DAMAGE IN THE TRANSCRIBED STRAND OF AN ACTIVE HUMAN GENE IS DEFECTIVE IN COCKAYNE-SYNDROME SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE STRAND-SELECTIVE DNA REPAIR; UV DAMAGE; XERODERMA-PIGMENTOSUM; HUMAN REPAIR DISORDERS ID HUMAN METALLOTHIONEIN GENES; DIHYDROFOLATE-REDUCTASE GENE; RNA POLYMERASE-II; DNA DAMAGE; XERODERMA-PIGMENTOSUM; COMPLEMENTATION GROUPS; ADDUCTS; SENSITIVITY; HELICASES; STRAINS AB Cells from patients with Cockayne syndrome (CS), which are sensitive to killing by UV although overall damage removal appears normal, are specifically defective in repair of UV damage in actively transcribed genes. Because several CS strains display cross-sensitivity to killing by ionizing radiation, we examined whether ionizing radiation-induced damage in active genes is preferentially repaired by normal cells and whether the radiosensitivity of CS cells can be explained by a defect in this process. We found that ionizing radiation-induced damage was repaired more rapidly in the transcriptionally active metallothionein IIA (MTIIA) gene than in the inactive MTIIB gene or in the genome overall in normal cells as a result of faster repair on the transcribed strand of MTIIA. Cells of the radiosensitive CS strain CS1AN are completely defective in this strand-selective repair of ionizing radiation-induced damage, although their overall repair rate appears normal. CS3BE cells, which are intermediate in radiosensitivity, do exhibit more rapid repair of the transcribed strand but at a reduced rate compared to normal cells. Xeroderma pigmentosum complementation group A cells, which are hypersensitive to UV light because of a defect in the nucleotide excision repair pathway but do not show increased sensitivity to ionizing radiation, preferentially repair ionizing radiation-induced damage on the transcribed strand of MTIIA. Thus, the ability to rapidly repair ionizing radiation-induced damage in actively transcribing genes correlates with cell survival. Our results extend the generality of preferential repair in active genes to include damage other than bulky lesions. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP LEADON, SA (reprint author), UNIV N CAROLINA,DEPT RADIAT ONCOL,CHAPEL HILL,NC 27599, USA. FU NCI NIH HHS [CA40453] NR 34 TC 195 Z9 199 U1 0 U2 2 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 NOV 15 PY 1993 VL 90 IS 22 BP 10499 EP 10503 DI 10.1073/pnas.90.22.10499 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MH322 UT WOS:A1993MH32200019 PM 8248136 ER PT J AU HUANG, YH ZHU, W KOURI, DJ HOFFMAN, DK AF HUANG, YH ZHU, W KOURI, DJ HOFFMAN, DK TI ANALYTIC CONTINUATION OF THE POLYNOMIAL REPRESENTATION OF THE FULL, INTERACTING TIME-INDEPENDENT GREEN-FUNCTION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SYSTEMS AB We present an analytic continuation of a polynomial representation of the full, interacting time-independent Green function, thereby enabling the use of negative, imaginary absorbing potentials to shorten the grid necessary to treat scattering problems. The approach retains the clean separation of the energy and Hamiltonian dependences characteristic of our earlier orthogonal polynomial representation of the operator (E-H+i0+)-1. This treatment, combined with our time-independent wavepacket Lippmann-Schwinger equation method, leads to a computational approach in which all of the energy dependence resides in known analytical expansion coefficients. The Hamiltonian operator appears as the argument of other orthogonal polynomials. These act solely on an initial wavepacket which provides a ''universal source'' of scattered waves, independent of the particular energies of interest. This energy independence, combined with highly truncated grids, results in an extremely efficient procedure for scattering calculations. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT ENERGY,AMES LAB,AMES,IA 50011. RP HUANG, YH (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 16 TC 39 Z9 39 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 NOV 12 PY 1993 VL 214 IS 5 BP 451 EP 455 DI 10.1016/0009-2614(93)85665-B PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MF362 UT WOS:A1993MF36200005 ER PT J AU BATCHELOR, SN MCLAUCHLAN, KA SHKROB, IA AF BATCHELOR, SN MCLAUCHLAN, KA SHKROB, IA TI SPIN-SELECTIVE RECOMBINATION IN GEMINATE RADICAL PAIRS INVOLVING ELECTRONICALLY EXCITED RADICALS STUDIED BY MFE AND CIDEP SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MAGNETIC-FIELD; CARBONYL-COMPOUNDS; RESONANCE; MICELLES; SPECTROSCOPY; BIRADICALS; DYNAMICS; EPR AB Magnetic field effects are reported from radical combination reactions involving electronically excited diphenylmethyl and para-substituted benzyl radicals created, along with a ground-state radical, by laser flash photolysis of micellized ketones. A parallel CIDEP study of ground-state radicals displayed inverse behaviour. The results are thought to shed light on the diffusional processes occurring in micellar solutions. C1 UNIV OXFORD,PHYS CHEM LAB,S PARKS RD,OXFORD OX1 3QZ,ENGLAND. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 31 TC 5 Z9 5 U1 1 U2 3 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 NOV 12 PY 1993 VL 214 IS 5 BP 507 EP 512 DI 10.1016/0009-2614(93)85674-D PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MF362 UT WOS:A1993MF36200014 ER PT J AU BLEIER, A AF BLEIER, A TI PARTICLE-SIZE AND SOLVENT EFFECTS IN THE PROCESSING OF SILICON SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article DE CRITICAL PARTICLE SIZE; DIELECTRIC MATCHING; DISPERSIBILITY; NONAQUEOUS STABILITY; SILICON SUSPENSIONS ID FORCES; HETEROCOAGULATION; SUSPENSIONS; DISPERSION; COMPOSITES; SURFACES; POWDER; WATER AB A dispersibility model previously developed for silicon powder that does not possess surface charge in non-aqueous media is extended to predict the behavior when surface charge exists, for instance as a result of surface oxidation. The role of particle size is also examined. In the absence of surface charge, a critical particle size exists below which silicon susPensions are colloidally stable and above which they are not. This value depends on the dielectric permittivity of the liquid medium and becomes infinite if it matches that of silicon. In the presence of surface charge, the critical size also depends on the electrostatic potential at the particle-liquid interface. Steric dispersants that stabilize suspensions may affect the critical size also. Diagrams which show the transitions between conditions that lead to useful, stable suspensions and those that promote extensive agglomeration of silicon are developed. RP BLEIER, A (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 72 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD NOV 12 PY 1993 VL 79 IS 2-3 BP 275 EP 292 DI 10.1016/0927-7757(93)80181-D PG 18 WC Chemistry, Physical SC Chemistry GA MK915 UT WOS:A1993MK91500014 ER PT J AU GAMCSIK, MP LUDEMAN, SM SHULMANROSKES, EM MCLENNAN, IJ COLVIN, ME COLVIN, OM AF GAMCSIK, MP LUDEMAN, SM SHULMANROSKES, EM MCLENNAN, IJ COLVIN, ME COLVIN, OM TI PROTONATION OF PHOSPHORAMIDE MUSTARD AND OTHER PHOSPHORAMIDES SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID MAGNETIC-RESONANCE SPECTROSCOPY; NMR SPECTRAL PROPERTIES; O-17 NMR; AQUEOUS-SOLUTION; ADENINE-NUCLEOTIDES; FREE-ENERGIES; SOLVATION; HYDROLYSIS; N-15; THIOPHOSPHATE AB The chemistry of the bifunctional alkylating agent phosphoramide mustard and model phosphoramides was probed by multinuclear NMR spectroscopy as a function of pH. Between pH 1 and 11, both the P-31 and N-15 resonances for phosphoramide mustard displayed a single monobasic titration curve with a pK(a) of 4.9. The protonation below pH 4.9 correlates with the loss in reactivity of the mustard. The O-17 NMR spectrum of O-17-enriched phosphoramide mustard shows little change with pH. The data on the mustard was compared to N-15 and P-31 NMR data on N-15-enriched phosphoramidic acid, phosphorodiamidic acid, and phosphoric triamide. Contrary to the conclusions of previous studies, our combined P-31, N-15, and O-17 NMR results are more consistent with N-protonation of phosphoramide mustard rather than an O-protonation. Theoretical calculations on the phosphoramidic acid, phosphorodiamidic acid, and phosphoric triamide show O-protonation to be more stable in the gas phase. For the latter two compounds, the calculations suggest that N-protonation may be the most stable protonated form in the aqueous phase. These findings influence our understanding of the structure-activity relationships of phosphoramide mustards. C1 JOHNS HOPKINS UNIV,SCH MED,DEPT RADIOL,BALTIMORE,MD 21205. JOHNS HOPKINS UNIV,SCH MED,CTR ONCOL,BALTIMORE,MD 21205. DALHOUSIE UNIV,DEPT CHEM,HALIFAX B3H 4J3,NS,CANADA. SANDIA NATL LABS,CTR COMPUTAT ENGN,LIVERMORE,CA 94551. FU NCI NIH HHS [CA09243-14, CA16783, CA51229] NR 50 TC 22 Z9 22 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD NOV 12 PY 1993 VL 36 IS 23 BP 3636 EP 3645 DI 10.1021/jm00075a019 PG 10 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA MH599 UT WOS:A1993MH59900019 PM 8246232 ER PT J AU FRANK, CW AF FRANK, CW TI SUPPORT FOR RUSSIAN SCIENCE SO SCIENCE LA English DT Letter RP FRANK, CW (reprint author), US DOE,WASHINGTON,DC 20585, 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 NOV 12 PY 1993 VL 262 IS 5136 BP 975 EP 975 DI 10.1126/science.262.5136.975 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MG187 UT WOS:A1993MG18700006 PM 17782034 ER PT J AU REDONDO, A HAY, PJ AF REDONDO, A HAY, PJ TI QUANTUM-CHEMICAL STUDIES OF ACID SITES IN ZEOLITE ZSM-5 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID STOICHIOMETRIC ADSORPTION COMPLEXES; SEMIEMPIRICAL METHODS; FRAMEWORK; ALUMINUM; PARAMETERS; ABINITIO; H-ZSM-5; OPTIMIZATION; DEPENDENCE; MOLECULES AB Semiempirical quantum chemical calculations have been performed using cluster models for the acid sides of zeolite ZSM-5. The effects of lattice relaxation and oxygen protonation at T sites where Al has been substituted for Si have been treated using 12 clusters containing about 100 atoms to represent the 12 distinct T sites. The calculations show a wide range (1.2 eV) in the (Al,H)/Si substitution energies, but nearly every site gives rise to at least one acid site whose energy is less than 0.2 eV from that of the lowest-energy T9 site. The calculations also show that there exists a direct correlation between the substitution energy and the proton affinity of a given site-those sites that exhibit the largest proton affinity are the ones for which the aluminum is most stable. From comparing the most favorable location for a proton at each of the 12 T sites in ZSM-5, the proton affinities are found to vary by 0.3 eV (29/kJ/mol). In addition, both the (Al,H)/Si substitution energy and the proton affinity depend on the geometric parameters, such as bond lengths and angles, of the optimum configurations for the acid sites. The most stable sites for protons correspond to ''pore'' sites where the proton is oriented into the major pores of the zeolite lattice. The most important conclusion from this study is that there is a direct relationship between the experimental T-O-T angle and the proton affinity. This suggests that the T-O-T angle can be used as a measure of the acidity of the site. This conclusion, although obtained for the 48 sites of zeolite ZSM-5, would be expected to be transferable to other zeolites. RP REDONDO, A (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 25 TC 134 Z9 136 U1 2 U2 17 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 NOV 11 PY 1993 VL 97 IS 45 BP 11754 EP 11761 DI 10.1021/j100147a031 PG 8 WC Chemistry, Physical SC Chemistry GA MG299 UT WOS:A1993MG29900031 ER PT J AU BROWNING, ND CHISHOLM, MF PENNYCOOK, SJ AF BROWNING, ND CHISHOLM, MF PENNYCOOK, SJ TI ATOMIC-RESOLUTION CHEMICAL-ANALYSIS USING A SCANNING-TRANSMISSION ELECTRON-MICROSCOPE SO NATURE LA English DT Article ID INTERFACE; CRYSTALS; SCATTERING AB THE high angle elastic scattering of electrons in scanning transmission electron microscopy depends strongly on the atomic number Z, of the sample atoms, through the Z2 dependence of the Rutherford scattering cross-section1. The detection of scattered electrons at high angles and over a large angular range (75-150 milliradians) removes the coherent effects of diffraction, and the resulting incoherent image provides a compositional map of the sample with high atomic-number contrast1. If a fine electron probe is used, and the sample is a crystalline material oriented along one of its principal axes, individual columns of atoms can be imaged in this way2. Electrons scattered at low angles are not used in this detection scheme, and are thus available for simultaneous electron energy-loss spectroscopy3; in principle, this combination of techniques should allow the direct chemical analysis of single atomic columns in crystalline materials. Here we present electron energy-loss spectra from expitaxial interfaces between cobalt silicide and silicon, which confirm that atomic resolution can be achieved by this approach. The ability to correlate structure and chemistry with atomic resolution holds great promise for the detailed study of defects and interfaces. RP BROWNING, ND (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. OI Browning, Nigel/0000-0003-0491-251X NR 20 TC 375 Z9 378 U1 10 U2 102 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 11 PY 1993 VL 366 IS 6451 BP 143 EP 146 DI 10.1038/366143a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MG216 UT WOS:A1993MG21600052 ER PT J AU LAWSON, CL AF LAWSON, CL TI TANDEM BINDING IN CRYSTALS OF A TRP REPRESSOR-OPERATOR HALF-SITE COMPLEX SO NATURE LA English DT Article ID ESCHERICHIA-COLI; DNA; CRYSTALLOGRAPHY; DETECTOR AB THE crystal structure of trp repressor tandemly bound in a 2:1 complex to a 16-base-pair palindromic DNA containing a central trp operator half-site has been determined and refined to 2.4 angstrom resolution. Despite dramatically different DNA sequence contexts and crystallization conditions, the protein/DNA interface is essentially identical to that seen in the original trp repressor/operator complex structure1. Water-mediated sequence recognition by trp repressor is likely to be related to the unusual end-on approach of the recognition helix (E), which allows sharing of the major groove by tandem dimers. The tandem complex model accounts for the mutational sensitivity of all trp operator base pairs. The structure also provides the first detailed view of the tandem interaction, revealing a key role for the amino-terminal arms. C1 PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544. RP LAWSON, CL (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 29 TC 148 Z9 150 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 11 PY 1993 VL 366 IS 6451 BP 178 EP 182 DI 10.1038/366178a0 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MG216 UT WOS:A1993MG21600064 PM 8232559 ER PT J AU BERGER, EL SRIDHAR, K AF BERGER, EL SRIDHAR, K TI QCD CALCULATION OF J/PSI+GAMMA MASS DISTRIBUTIONS SO PHYSICS LETTERS B LA English DT Article ID UNITARY AB We compute the J/psi+gamma invariant-mass distribution from the QCD subprocess g+g-->J/psi+gamma. At large masses, this subprocess is the dominant mechanism for J/psi+gamma production, and data could provide a good test of QCD. The mass distribution peaks at relatively small masses (3.4-4.0 GeV) and the subprocess could, therefore, represent a significant QCD background to J/psi+gamma decay of heavier charmonia. We also analyze the J/psi angular distribution in the J/psi+gamma rest frame. C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP BERGER, EL (reprint author), CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. NR 14 TC 4 Z9 4 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 NOV 11 PY 1993 VL 317 IS 3 BP 443 EP 448 DI 10.1016/0370-2693(93)91022-F PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF932 UT WOS:A1993MF93200031 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZAITSEV, N ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZAITSEV, N ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI CHI(C)-PRODUCTION IN HADRONIC Z-DECAYS SO PHYSICS LETTERS B LA English DT Article ID B-MESONS AB We report on inclusive chi(c) production in Z decays reconstructed via the decay mode chi(c) --> J + gamma. This analysis is based on 1.1 million hadronic Z events. Interpreting the observed signal as chi(c1), we obtain a branching ratio Br(Z --> chi(c1) + X) = (7.5 +/- 2.9(stat.) +/- 0.6(sys.)) x 10(-3). Assuming all events are produced in b decays we obtain Br(b --> chi(c1) + X) = (2.4 +/- 0.9(stat.) +/- 0.2(sys.)) x 10(-2). We also present an improved measurement of the branching ratio Br(Z --> J + X) = (3.6 +/- 0.5(stat.) +/- 0.4(sys.)) x 10(-3), obtained from dileptonic J decays. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. IN2P3, CNRS, LAB ANNECY LE VIEUX PHYS PARTICULES, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. INFN, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, 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. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. FBLJA PROJECT, WORLD LAB, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, IN2P3, CNRS, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. INFN, I-20133 MILAN, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW, RUSSIA. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. CATHOLIC 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. CALTECH, PASADENA, CA 91125 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, I-50125 FLORENCE, ITALY. RI D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Cerrada, Marcos/J-6934-2014; Fiandrini, Emanuele/C-4549-2008; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; van der Zwaan, Bob/F-4070-2015; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012 OI D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Filthaut, Frank/0000-0003-3338-2247; Cerrada, Marcos/0000-0003-0112-1691; Ludovici, Lucio/0000-0003-1970-9960; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; van der Zwaan, Bob/0000-0001-5871-7643; Servoli, Leonello/0000-0003-1725-9185; NR 16 TC 18 Z9 18 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 11 PY 1993 VL 317 IS 3 BP 467 EP 473 DI 10.1016/0370-2693(93)91026-J PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF932 UT WOS:A1993MF93200035 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A 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LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZAITSEV, N ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZAITSEV, N ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI MEASUREMENT OF THE AVERAGE LIFETIME OF B-HADRONS SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; BOTTOM HADRONS; Z(0) DECAYS; E+E-PHYSICS; QUARK; MESON AB The average lifetime of b hadrons has been measured using the L3 detector at LEP, running at square-root s almost-equal-to M(Z). A b-enriched sample was obtained from 432 538 hadronic Z events collected in 1990 and 1991 by tagging electrons and muons from semileptonic b hadron decays. From maximum likelihood fits to the electron and muon impact parameter distributions, the average b hadron lifetime was measured to be tau(b) = (1535 +/- 35 +/- 28) fs, where the first error is statistical and the second includes both the experimental and the theoretical systematic uncertainties. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. IN2P3, CNRS, LAB ANNECY LE VIEUX PHYS PARTICULES, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. INFN, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, 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. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. FBLJA PROJECT, WORLD LAB, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, IN2P3, CNRS, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. INFN, I-20133 MILAN, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW, RUSSIA. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. CATHOLIC 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. CALTECH, PASADENA, CA 91125 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, I-50125 FLORENCE, ITALY. RI Tsaregorodtsev, Andrei/E-3873-2016; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; Fiandrini, Emanuele/C-4549-2008; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Josa, Isabel/K-5184-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014 OI Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023 NR 37 TC 20 Z9 20 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 11 PY 1993 VL 317 IS 3 BP 474 EP 484 DI 10.1016/0370-2693(93)91027-K PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF932 UT WOS:A1993MF93200036 ER PT J AU BERNACKI, BE MANSURIPUR, M AF BERNACKI, BE MANSURIPUR, M TI INVESTIGATION OF SUBSTRATE BIREFRINGENCE EFFECTS ON OPTICAL-DISK PERFORMANCE SO APPLIED OPTICS LA English DT Article DE DISK SUBSTRATE BIREFRINGENCE; BIREFRINGENCE; OPTICAL DATA RECORDING AB Substrates for magneto-optical disks are produced economically and efficiently by injection molding of polycarbonate plastics. Unfortunately, most plastics are birefringent, with different refractive indices in the plane of the disk (lateral birefringence) and perpendicular to the plane of the disk (vertical birefringence). One manifestation of media birefringence is the existence of a focus offset between the two distinct best-focus positions for data detection and tracking. This focus offset degrades overall system performance as the compromise focus position between the two best-focus points reduces the operating margin of the individual data and tracking channels. We present detailed numerical modeling results on the role of substrate birefringence in causing this focus offset. C1 UNIV ARIZONA, CTR OPT SCI, TUCSON, AZ 85721 USA. RP BERNACKI, BE (reprint author), OAK RIDGE NATL LAB, DIV INSTRUMENTAT & CONTROLS, OAK RIDGE, TN 37831 USA. NR 15 TC 39 Z9 39 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 10 PY 1993 VL 32 IS 32 BP 6547 EP 6555 PG 9 WC Optics SC Optics GA MG301 UT WOS:A1993MG30100019 PM 20856497 ER PT J AU HOWARD, WM GORIELY, S RAYET, M ARNOULD, M AF HOWARD, WM GORIELY, S RAYET, M ARNOULD, M TI NEUTRON-RICH ALPHA-RICH FREEZE-OUT AND THE R-PROCESS IN THE HIGH-ENTROPY NEUTRINO-ENERGIZED SUPERNOVA BUBBLE SO ASTROPHYSICAL JOURNAL LA English DT Article ID NUCLEAR-MASS FORMULA; THOMAS-FERMI APPROACH; PROCESS NUCLEOSYNTHESIS; MODEL AB The high-entropy alpha-rich freeze-out of neutron-rich nuclei suggested by Woosley and Hoffman and the subsequent formation of r-nuclides are studied in the framework of a recent supernova model. The calculations are performed with the help of a single reaction network that is able to describe the establishment of the nuclear statistical equilibrium, the charged-particle reaction freeze-out, and the subsequent neutron captures and beta-decays that produce the r-nuclides. We analyze the effect of using various models for the nuclear binding energies, and in particular the new Extended Thomas-Fermi plus Strutinsky Integral method and the finite-range droplet model. These nuclear mass models are also used to calculate the beta-decay rates with the gross theory. We delineate the range of entropies necessary to produce a solar-system-like distribution of the r-nuclides. We also discuss in detail how the freeze-out affects the final r-process abundance distribution. C1 UNIV LIBRE BRUXELLES,INST ASTRON & ASTROPHYS,B-1050 BRUSSELS,BELGIUM. RP HOWARD, WM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 38 TC 54 Z9 54 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 NOV 10 PY 1993 VL 417 IS 2 BP 713 EP 724 DI 10.1086/173350 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MD971 UT WOS:A1993MD97100031 ER PT J AU KIMURA, M DALGARNO, A CHANTRANUPONG, L LI, Y HIRSCH, G BUENKER, RJ AF KIMURA, M DALGARNO, A CHANTRANUPONG, L LI, Y HIRSCH, G BUENKER, RJ TI RATE COEFFICIENTS FOR CHARGE-TRANSFER OF HE+ WITH C SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES ID ENERGY; SN-1987A AB Rate coefficients for nonradiative charge transfer in collisions of He+ with C are calculated for temperatures up to 10,000 K. The rate coefficients increase from 2.8 x 10(-15) cm3 s-1 at 100 K to 6.8 x 10(-13) cm2 s-1 at 10,000 K. C1 BERG UNIV GESAMTHSCH WUPPERTAL,GESAMTH SCH,WUPPERTAL,W-5600 WUPPERTAL 1,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP KIMURA, M (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,60 GARDEN ST,CAMBRIDGE,MA 02138, USA. NR 9 TC 15 Z9 15 U1 1 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1993 VL 417 IS 2 BP 812 EP 814 DI 10.1086/173361 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MD971 UT WOS:A1993MD97100042 ER PT J AU WANG, WD BAKAC, A ESPENSON, JH AF WANG, WD BAKAC, A ESPENSON, JH TI KINETICS AND MECHANISMS OF THE REDOX REACTIONS OF THE HYDROPEROXOCHROMIUM(III) ION SO INORGANIC CHEMISTRY LA English DT Article ID TRANSITION-METAL COMPLEXES; COORDINATED SULFENIC ACIDS; HYDROGEN-PEROXIDE; SUPEROXOCHROMIUM(III) ION; MOLECULAR-OXYGEN; OXIDATION; HYDROPEROXIDES; COBALT(III); HOMOLYSIS; CATALYSIS AB The reactions of the hydroperoxochromium(III) ion, (H2O)5CrO2H2+ (CrO2H2+), with Fe2+, VO2+, V2+, Cu+, Ti3+, Co([14]aneN4)2+, Co(Me6[14]aneN4)2+, Co(tim)2+, and [Ru(NH3)6]2+ have been studied in acidic aqueous solution. The reactions are accompanied by large negative entropies of activation, -110 J mol-1 K-1 for Fe2+ and -85 J mol-1 K-1 for Ti3+. All the reactions studied follow an isokinetic relationship in that DELTAH(double dagger) is a linear function of DELTAS(double dagger). The same is true for the analogous reactions of H2O2. It is proposed that the reactions of CrO2H2+ take place by an inner-sphere, Fenton-type process yielding pentaaquaoxochromium(IV), (H2O)5CrO2+ (CrO2+), as an intermediate. The reactivity of CrO2H2+ as an oxygen transfer reagent is about 20 times greater than that of H2O2. For example, the reactions with (en)2CoSCH2CH2NH22+ to yield (en)2CoS(O)CH2CH2NH2(2+) have rate constants 20.5 +/- 0.4 M-1 s-1 (CrO2H2+) and 1.36 M-1 s-1 (H2O2), both in 0.1 M HClO4 at 25-degrees-C. The chromyl ion, CrO2+, oxidizes CrO2H2+ to CrO22+ with a rate constant of (1.34 +/- 0.06) X 10(3) M-1 s-1 in 0.10 M HClO4 in H2O and 266 +/- 10 M-1 s-1 in D2O. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 48 TC 24 Z9 24 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 10 PY 1993 VL 32 IS 23 BP 5034 EP 5039 DI 10.1021/ic00075a015 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA MG613 UT WOS:A1993MG61300015 ER PT J AU ATAGI, LM HOFFMAN, DM SMITH, DC AF ATAGI, LM HOFFMAN, DM SMITH, DC TI SYNTHESES AND CHARACTERIZATIONS OF A NEW BULKY DISILAZANE AND 2 LITHIUM DISILAZIDES SO INORGANIC CHEMISTRY LA English DT Article ID RAY CRYSTAL-STRUCTURE; ELECTRON-DIFFRACTION; MOLECULAR-STRUCTURES; AMIDES; HEXAMETHYLDISILAZIDE; DERIVATIVES; COMPLEXES AB Reaction of dimethylamine with Cl3SiN(H)SiMe3 in hexane solution at 25-degrees-C gave the bulky disilazane [(Me2N)3Si]N(H)SiMe3 in 73% yield. Reaction of [(Me2N)3Si]N(H)SiMe3 with n-butyllithium in benzene at 0-degrees-C produced the lithium complex [(Me2N)3Si]N(Li)SiMe3 in 82% yield. LiN[Si(NMe2)3]2 was prepared in 92% yield from the reaction of HN(SiCl3)2 and 7 equiv of LiNMe2 in hexane. LiN[Si(NMe2)3]2 is converted to the amine (83% yield) by reaction with [H2NMe2]Cl in THF. The new compounds were characterized spectroscopically, and the X-ray crystal structures of [(Me2N)3Si]N(Li)SiMe3 and LiN[Si(NMe2)3]2 were determined. [(Me2N)3Si]N(Li)SiMe3 and LiN[Si(NMe2)3]2 are dimeric in the solid state, forming four-membered Li2N2 rings. In both cases dimethylamido groups bridge between silicon and lithium, giving three-coordinate lithium in {[(Me2N)3Si]N(Li)SiMe3}2 and four-coordinate lithium in {LiN[Si(NMe2)3]2}2. Crystal data at -50-degrees-C (Mo Kalpha radiation, lambda = 0.710 73 angstrom): {[Me2N)3-Si]N(Li)SiMe3}2, C18H54N8Li2Si4, a = 8.594(2) angstrom, b = 17.185(3) angstrom, c = 22.045(4) angstrom, beta = 95.29(2)degrees, monoclinic, space group C2/c, Z = 4, R = 0.045; {LiN[Si(NMe2)3]2}2, C24H72N14Li2Si4, a = 16.634(4) angstrom, b = 21.169(7) angstrom, c = 23.924(8) angstrom, orthorhombic, space group Pbca, Z = 8, R = 0.044. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 29 TC 7 Z9 7 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 10 PY 1993 VL 32 IS 23 BP 5084 EP 5087 DI 10.1021/ic00075a023 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA MG613 UT WOS:A1993MG61300023 ER PT J AU COTTON, FA DUNBAR, KR HONG, B JAMES, CA MATONIC, JH THOMAS, JLC AF COTTON, FA DUNBAR, KR HONG, B JAMES, CA MATONIC, JH THOMAS, JLC TI COMPLEXES CONTAINING HETERONUCLEAR AND HOMONUCLEAR QUADRUPLE BONDS - PREPARATION AND CHARACTERIZATION OF MOWCL4(DMPM)2 AND MO2X4(DMPM)2 (X = BR, I) SO INORGANIC CHEMISTRY LA English DT Article ID STRUCTURAL CHARACTERIZATION AB The quadruply bonded heterobimetallic complex MoWCl4(dmpm)2 (1) and the homobimetallic complexes Mo2X4-(dmpm)2 (X = Br (2),I, (3)) were synthesized and their structures determined. The crystals of compound 1 exhibit the typical disorder for heteronuclear systems, namely, the random orientation of the M-M' vector, with each metal atom appearing as 50% Mo and 50% W. The structural refinement in the space group P4 resulted in lower residuals, with R = 0.048 and R(w) = 0.067, than in the space group P4/m. For complexes 2 and 3, crystals obtained from THF solutions are monoclinic, with space groups P2(1)/c and P2(1)/n for 2 and 3, respectively. The quadruple bond distances are 2.193(2), 2.1271 (8), and 2.132(2) angstrom for 1, 2, and 3, respectively. In addition, each complex has been characterized using UV-visible, P-31{H-1} NMR, and H-1 NMR spectroscopies. The average magnetic anisotropy of the Mo-Mo quadruple bond in complexes 2 and 3 has been calculated from H-1 NMR data as -4450 x 10(-36) m3 molecule-1. The crystal structures of complexes 1-3 are fully described, and their crystallographic data are as follows: (1) space group P4 with a = b = 9.083 (2) angstrom, c = 8.092(2) angstrom, V = 667.5(5) angstrom3, and Z = 2; (2) space group P2(1)/n with a = 8.694(1) angstrom, b = 8.695(2) angstrom, c = 15.369(2) angstrom, beta = 100.70(1)degrees, V = 1141.6(6) angstrom3, and Z = 2; (3) space group P2(1)/c with a = 9.076(2) angstrom, b = 16.813(7) angstrom, c = 16.654(5) angstrom, beta = 102.4(1)degrees, V = 2481(4) angstrom3, and Z = 4. C1 MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824. TEXAS A&M UNIV SYST,MOLEC STRUCT & BONDING LAB,COLL STN,TX 77843. LOS ALAMOS NATL LAB,DEPT CHEM,LOS ALAMOS,NM 87545. RP COTTON, FA (reprint author), TEXAS A&M UNIV SYST,DEPT CHEM,COLL STN,TX 77843, USA. RI Dunbar, Kim/B-6488-2015; OI Dunbar, Kim/0000-0001-5728-7805; Matonic, John/0000-0002-6059-1514 NR 17 TC 9 Z9 9 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 NOV 10 PY 1993 VL 32 IS 23 BP 5183 EP 5187 DI 10.1021/ic00075a040 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA MG613 UT WOS:A1993MG61300040 ER PT J AU SHERMAN, DM AF SHERMAN, DM TI EQUATION OF STATE, ELASTIC PROPERTIES, AND STABILITY OF CASIO3 PEROVSKITE - 1ST PRINCIPLES (PERIODIC HARTREE-FOCK) RESULTS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID MOLECULAR-ORBITAL METHODS; VALENCE BASIS-SETS; HIGH-PRESSURE; STISHOVITE; COMPRESSION; MGSIO3; POLYMORPH; ELEMENTS; GARNETS; MANTLE AB The cubic CaSiO3 perovskite phase is possibly the third most abundant mineral in the lower mantle. In addition to its geochemical significance, CaSiO3 Perovskite provides a useful system with which to test the application of quantum chemistry to mantle silicates. Here, the electronic structure, equation of state, and elastic properties of cubic CaSiO3 perovskite are calculated using the periodic Hartree-Fock formalism. Cubic CaSiO3 is found to be stable relative to an orthorhombic structure to at least 106 GPa. Calculations using a moderately extended basis set give an equation of state for CaSiO3 in close agreement with experiment (V0 = 44.96 angstrom3, K0 = 300 GPa, and K0' = 4). The aggregate shear modulus of CaSiO3 perovskite is found to be 209 GPa which is comparable to that of MgSiO3 perovskite. The high seismic velocities of CaSiO3 perovskite means it will act as a seismic complement to magnesiowustite in the lower mantle. The free energy, as a function of pressure, of stishovite and B2-CaO have also been calculated at the same level of theory. From those results, it is found that cubic CaSiO3 perovskite is stable relative to the free oxides at pressures up to 130 GPa (the core-mantle boundary). RP SHERMAN, DM (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. RI Sherman, David/A-7538-2008 OI Sherman, David/0000-0003-1835-6470 NR 40 TC 27 Z9 29 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD NOV 10 PY 1993 VL 98 IS B11 BP 19795 EP 19805 DI 10.1029/93JB02175 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MG708 UT WOS:A1993MG70800020 ER PT J AU ROMERO, AE MCEVILLY, TV MAJER, EL MICHELINI, A AF ROMERO, AE MCEVILLY, TV MAJER, EL MICHELINI, A TI VELOCITY STRUCTURE OF THE LONG VALLEY CALDERA FROM THE INVERSION OF LOCAL EARTHQUAKE P-TRAVEL AND S-TRAVEL TIMES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SATURATED CRACKED SOLIDS; COMPRESSIONAL-WAVE; MAGMA CHAMBER; CALIFORNIA; ROCKS; HYPOCENTERS; BENEATH; REFLECTION; GEYSERS; AREA AB A high-resolution tomographic study of the Long Valley region began in 1989 with the installation of a special fan array of eight three-component borehole (80-160 m depths) receivers on the northwestern rim of the caldera to provide the data necessary for a joint inversion for hypocenters and the three-dimensional P and S wave velocity structure in and below the caldera. The experiment specifically targeted the subsurface location of the previously inferred magma chamber beneath the Resurgent Dome. Additional coverage was provided by existing U.S. Geological Survey and University of Nevada, Reno seismographic networks. We employed the progressive inversion scheme of Thurber (1983), with cubic spline interpolation after Michelini and McEvilly (1991). The final model is based on data from 280 well-distributed local earthquakes. Some 6900 arrival times were used, including about 700 S wave times from the three-component stations. The resulting velocity structure reflects the known geology, defining the low-velocity caldera fill to 2 km depth, contrasting markedly with the surrounding higher-velocity Sierran block and highland terrane. No isolated distinct low-velocity anomalies are revealed beneath the caldera floor, although a diffuse zone of reduced velocity persists to a depth of about 8 km. These lower velocities may be related to hydrothermal alteration and/or extensive fractures. The Vp/Vs structure contains significant lateral variation within and beneath the caldera to about 8 km depth, and these variations can be related to accepted models of the active geothermal system. The lack of a significant S wave velocity anomaly, along with the normal or low values of the Vp/Vs ratio, argues against the presence of a sizable and distinct magma body at shallow to midcrustal depth beneath Long Valley caldera, although a very low percentage of partial melt cannot be precluded. C1 CNR,INST TALASSOGRAFICO SPERIMENTALE,I-34110 TRIESTE,ITALY. RP ROMERO, AE (reprint author), LAWRENCE BERKELEY LAB,CTR COMPUTAT SEISMOL,DIV EARTH SCI,MS 50E,BERKELEY,CA 94720, USA. NR 36 TC 16 Z9 16 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD NOV 10 PY 1993 VL 98 IS B11 BP 19869 EP 19879 DI 10.1029/93JB01553 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MG708 UT WOS:A1993MG70800025 ER PT J AU KATANO, S YAMAYA, K FERNANDEZBACA, JA FUNAHASHI, S AF KATANO, S YAMAYA, K FERNANDEZBACA, JA FUNAHASHI, S TI CRYSTAL-STRUCTURE OF THE TETRAGONAL SUPERCONDUCTOR CALABACU3OX (6.69-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-6.94) SO PHYSICA C LA English DT Article ID OXYGEN AB The room-temperature crystalline structure of CaLaBaCu3Ox has been studied by high-resolution neutron powder diffraction. The profile analysis on specimens with oxygen contents x ranging from 6.94 (80 K superconductor) to 6.69 (non-superconductor) indicates that these compounds are isostructural with the non-superconducting tetragonal YBa2Cu3Oy (y < 6.4, space group P4/mmm), and that Ca and La atoms occupy the Y and Ba sites of the YBCO structure almost randomly. The changes in bond lengths with x are essentially the same as those of YBa2Cu3Oy. The superconductivity of the system can be understood in terms of the charge transfer between the superconducting CuO2 plane and the basal CuO plane, which would explain the variation of T(c) with the change in oxygen content. The similarities and differences between this system and YBa2Cu3Oy are discussed. C1 HOKKAIDO UNIV,DEPT NUCL ENGN,SAPPORO,HOKKAIDO 060,JAPAN. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP KATANO, S (reprint author), JAPAN ATOM ENERGY RES INST,DEPT MAT SCI & ENGN,TOKAI,IBARAKI 31911,JAPAN. RI Fernandez-Baca, Jaime/C-3984-2014 OI Fernandez-Baca, Jaime/0000-0001-9080-5096 NR 13 TC 7 Z9 7 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 NOV 10 PY 1993 VL 217 IS 1-2 BP 73 EP 78 DI 10.1016/0921-4534(93)90795-R PG 6 WC Physics, Applied SC Physics GA MG793 UT WOS:A1993MG79300010 ER PT J AU HOLESINGER, TG MILLER, DJ CHUMBLEY, LS AF HOLESINGER, TG MILLER, DJ CHUMBLEY, LS TI SOLID-SOLUTION REGION OF THE BI2SR2CACU2OY SUPERCONDUCTOR SO PHYSICA C LA English DT Article ID CA-CU-O; PHASE-EQUILIBRIA; SYSTEM; OXYGEN; TC AB Measurements were made of the compositional range of the Bi2Sr2CaCu2Ox superconductor in which the effects of intergrowths and grain-boundary phases were eliminated. At 800-degrees-C, the solid solution extends from Bi2.06Sr2.09Ca0.83Cu2.01Oy to Bi2.09Sr1.13Ca1.79Cu1.99Oy. Most of the cation interchange occurs between Sr and Ca while only a small variation in the Cu content was observed. In addition, substitution of Bi for Sr and/or Ca extends the range of compositions, although the reverse substitution of Sr or Ca for Bi does not seem to occur. The degree of interchange between Sr and Ca was found to decrease slowly with increasing temperatures in pure oxygen. In low oxygen partial pressures (0.1% O2), a significant portion of the Ca-rich solid solution region was found to be unstable. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,ARGONNE,IL 60439. AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP HOLESINGER, TG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 20 TC 49 Z9 49 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 NOV 10 PY 1993 VL 217 IS 1-2 BP 85 EP 96 DI 10.1016/0921-4534(93)90797-T PG 12 WC Physics, Applied SC Physics GA MG793 UT WOS:A1993MG79300012 ER PT J AU NORTON, DP CHAKOUMAKOS, BC JONES, EC CHRISTEN, DK LOWNDES, DH AF NORTON, DP CHAKOUMAKOS, BC JONES, EC CHRISTEN, DK LOWNDES, DH TI ANOMALOUS TRANSPORT AND STRUCTURAL-PROPERTIES OF SR1-XCUO2-DELTA THIN-FILMS SO PHYSICA C LA English DT Article ID PULSED-LASER DEPOSITION; MOLECULAR-BEAM EPITAXY; INFINITE LAYER PHASE; CU-O SYSTEM; SUPERCONDUCTIVITY; GROWTH; SR AB Transport and structural properties of Sr1-xCuO2-delta thin films grown by pulsed laser deposition support the contention that the tetragonal phase is capable of accommodating a significant density of alkaline-earth deficiencies up to x less-than-or-equal-to 0.3. Resistivity measurements indicate a significant change in the carrier density of the CuO2 planes as Sr vacancies are introduced. In addition, an enigmatic anomaly in the resistivity at 185 K is observed for Sr0.85CuO2-delta thin films. Magnetic measurements on these samples indicate that, although a significant drop in resistivity at 185 K is observed, it is not due to a superconducting transition. Hall measurements, as well as changes in the resistivity with film growth conditions, suggest that the majority carriers in these Sr1-xCuO2-delta thin films are electrons even with the Sr-vacancies present. RP NORTON, DP (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 26 TC 22 Z9 22 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 10 PY 1993 VL 217 IS 1-2 BP 146 EP 150 DI 10.1016/0921-4534(93)90804-Y PG 5 WC Physics, Applied SC Physics GA MG793 UT WOS:A1993MG79300019 ER PT J AU BATTEAS, JD GARDIN, DE VANHOVE, MA SOMORJAI, GA AF BATTEAS, JD GARDIN, DE VANHOVE, MA SOMORJAI, GA TI A LEED, TDS, AND HREELS STUDY OF CO ADSORBED ON THE RH(311) STEPPED SURFACE SO SURFACE SCIENCE LA English DT Article ID CARBON-MONOXIDE; VIBRATIONAL-SPECTRA; ADSORPTION; RHODIUM; RECONSTRUCTION; CHEMISORPTION; HYDROGEN; RH(111); RH(100); TEMPERATURE AB The bonding of CO on the stepped Rh(311) surface has been investigated by high resolution electron energy loss spectroscopy (HREELS), low-energy electron diffraction (LEED), and thermal desorption spectroscopy (TDS). At saturation coverage (estimated to be 1 monolayer) an ordered (2 x 2) surface structure is formed in the range of 120 to 270 K. Thermal desorption spectroscopy measurements (23 K s-1) show first order desorption with a shift in peak temperature from 528 K at low coverage to 503 K at high coverage, accompanied by an additional peak at 388 K. The heat of desorption at low coverage is found to be 31.1 kcal/mol which is nearly identical to the heat of desorption of CO from Rh(110), (100), and (111) showing that CO bonding at low coverages is structure insensitive. From the HREELS spectra both the Rh-C and CO stretching frequencies are observed to shift from 524 to 443 cm-1 and 1935 to 2056 cm-1 respectively as a function of CO coverage. HREELS spectra of the (2 x 2) structure find a CO stretch at a frequency of 2056 cm-1 and a Rh-C stretch at 443 cm-1, which indicates that the CO molecule is bonded to the top site of the step edges. Based on these results a structural model with CO top site adsorption is proposed. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP BATTEAS, JD (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Van Hove, Michel/A-9862-2008; Batteas, James/D-4144-2015 OI Van Hove, Michel/0000-0002-8898-6921; Batteas, James/0000-0002-6244-5000 NR 27 TC 24 Z9 24 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 10 PY 1993 VL 297 IS 1 BP 11 EP 18 DI 10.1016/0039-6028(93)90010-H PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MF343 UT WOS:A1993MF34300009 ER PT J AU SPRUNGER, PT POHL, K DAVIS, HL PLUMMER, EW AF SPRUNGER, PT POHL, K DAVIS, HL PLUMMER, EW TI MULTILAYER RELAXATION OF THE MG(0001) SURFACE SO SURFACE SCIENCE LA English DT Letter ID LATTICE-RELAXATION; METAL-SURFACES; DENSITY; MONOLAYERS; BERYLLIUM; AL(111); ENERGY; LEED AB We have investigated the interplanar relaxation of the clean (0001)-(1 x 1) surface of magnesium at 100 K using a dynamical LEED I-V analysis. In contrast to almost all other metal surfaces, an expansion has been observed for the first interlayer spacing of this clean surface. Using an extended database, the results indicate that the first three interlayer spacings are relaxed from the bulk value by: DELTAd12 = +1.9 +/- 0.3%, DELTAd23 = +0.8 +/- 0.4%, and DELTAd34 = -0.4 +/- 0.5%. A comparison of this observed multilayer relaxation with experimental and theoretical results for similar free-electron closepacked metal surfaces, e.g. Al(111), suggests that a surface expansion is a normal property of high electron density simple metals. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP SPRUNGER, PT (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. NR 34 TC 43 Z9 43 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 NOV 10 PY 1993 VL 297 IS 1 BP L48 EP L54 DI 10.1016/0039-6028(93)90004-4 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MF343 UT WOS:A1993MF34300003 ER PT J AU IM, S WASHBURN, J GRONSKY, R CHEUNG, NW YU, KM AGER, JW AF IM, S WASHBURN, J GRONSKY, R CHEUNG, NW YU, KM AGER, JW TI OPTIMIZATION OF GE/C RATIO FOR COMPENSATION OF MISFIT STRAIN IN SOLID-PHASE EPITAXIAL-GROWTH OF SIGE LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID SI1-XGEX AB In order to study the strain-compensation effect by C atoms in solid phase epitaxial (SPE) growth of SiGe alloy layers, C sequential implantation was performed in [100] oriented Si substrates with various doses after high dose (5 x 10(16)/cm2) Ge implantation. When the nominal peak concentration of implanted C was over 0.55 at. % in the present sample series, misfit dislocation generation in the epitaxial layer was considerably suppressed. A SiGe alloy layer with 0.9 at. % C peak concentration under a 12 at. % Ge peak shows the greatest improved crystallinity compared to layers with smaller C peak concentrations. The experimental results, combined with a simple model calculation, indicate that the optimum Ge/C ratio for strain compensation is between 11 and 22. C1 UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720. RP IM, S (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & ENGN,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012; OI Yu, Kin Man/0000-0003-1350-9642; Ager, Joel/0000-0001-9334-9751 NR 9 TC 24 Z9 24 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 NOV 8 PY 1993 VL 63 IS 19 BP 2682 EP 2684 DI 10.1063/1.110419 PG 3 WC Physics, Applied SC Physics GA MF860 UT WOS:A1993MF86000032 ER PT J AU WARREN, WL ROBERTSON, J KANICKI, J AF WARREN, WL ROBERTSON, J KANICKI, J TI SI AND N DANGLING BOND CREATION IN SILICON-NITRIDE THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; CORRELATION-ENERGY; POINT-DEFECTS; STATES AB We observe the simultaneous creation of paramagnetic Si and N dangling bonds when N-rich silicon nitride thin films are optically illuminated at low temperatures (110 K). Generally, only the Si dangling bond is observed if the illumination is performed at room temperature. In contrast, the N dangling bond is metastable, and has previously only been observed after a high temperature post-deposition anneal and followed by illumination. We propose that the low temperature illumination causes two processes: (1) Charge conversion of N3=Si+ and N3=Si-sites to give two N3=Si . dangling bonds, and (2) charge transfer between Si2=N- and N3=Si+ sites to form Si2=N . and N3=Si . dangling bonds. C1 NATL POWER LABS,LEATHERHEAD KT22 7SE,SURREY,ENGLAND. IBM CORP,DIV RES,TJ WATSON RES CTR,YORKTOWN HTS,NY 10598. RP WARREN, WL (reprint author), SANDIA NATL LABS,ADV MAT LAB,ALBUQUERQUE,NM 87106, USA. RI Kanicki, Jerzy/E-2753-2016 OI Kanicki, Jerzy/0000-0002-3649-8360 NR 20 TC 50 Z9 50 U1 0 U2 5 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 NOV 8 PY 1993 VL 63 IS 19 BP 2685 EP 2687 DI 10.1063/1.110420 PG 3 WC Physics, Applied SC Physics GA MF860 UT WOS:A1993MF86000033 ER PT J AU KUMAR, SS FARTASH, A GRIMSDITCH, M SCHULLER, IK KUMAR, RS AF KUMAR, SS FARTASH, A GRIMSDITCH, M SCHULLER, IK KUMAR, RS TI ELASTIC PROPERTIES OF POLYMER-FILMS .1. ELASTIC-CONSTANTS OF A POLYIMIDE FILM DETERMINED BY BRILLOUIN-SCATTERING AND MECHANICAL TECHNIQUES SO MACROMOLECULES LA English DT Article ID METALLIC-FILMS AB We discuss here the complete determination of the elastic properties of polymeric film using two experimental techniques. One technique employs the polymer film as a vibrating membrane and allows a direct determination of the ''macroscopic'' biaxial modulus, which serves as a figure of merit of polymer performance in applications such as packaging. Brillouin scattering, which measures the elastic properties on a approximately 100-mum scale, allows for a complete characterization of the elastic behavior. Both techniques have been applied to polyimide films. The results obtained by the two techniques are in agreement within the reported error bars. C1 AMOCO CHEM CO,AMOCO RES CTR,NEW PROD RES & DEV,NAPERVILLE,IL 60566. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. NR 13 TC 6 Z9 6 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 8 PY 1993 VL 26 IS 23 BP 6184 EP 6189 DI 10.1021/ma00075a008 PG 6 WC Polymer Science SC Polymer Science GA MF859 UT WOS:A1993MF85900008 ER PT J AU MELENKEVITZ, J SCHWEIZER, KS CURRO, JG AF MELENKEVITZ, J SCHWEIZER, KS CURRO, JG TI SELF-CONSISTENT INTEGRAL-EQUATION THEORY FOR THE EQUILIBRIUM PROPERTIES OF POLYMER-SOLUTIONS SO MACROMOLECULES LA English DT Article ID MONTE-CARLO SIMULATIONS; MOLECULAR LIQUIDS; EXCESS ELECTRONS; COPOLYMER MELTS; SIMPLE FLUIDS; SOLVENT; BLENDS; TRANSITION; MODEL; THERMODYNAMICS AB Self-consistent RISM integral equation theory of polymeric liquids is used to investigate the equilibrium properties of polymer solutions and melts. Density functional formalism is employed to derive the effective medium-induced potential between two sites on a polymer chain. The resulting expression leads to a coupling between the interchain and intrachain pair correlation functions. An approximate method for the calculation of the effective intrachain pair correlations is examined. The method employs Monte Carlo computer simulations of a single polymer chain interacting via local chemical interactions, long-range excluded volume, and the self-consistently determined medium-induced potential in the condensed phase to compute the intrachain pair correlations which are consistent with the interchain packing. Results for solutions of tangent hard-sphere chains are compared to recent off-lattice Monte Carlo simulations for various chain lengths and densities. In particular, it was found that the theory slightly overestimates the average size of the polymers in solution, while the density dependence of the average size of the chains is in good agreement with the Monte Carlo simulations. The inclusion of the self-consistent determination of the intrachain correlations is found to significantly alter the interchain pair correlation function at low and intermediate densities. C1 UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801. RP MELENKEVITZ, J (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 46 TC 70 Z9 70 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 8 PY 1993 VL 26 IS 23 BP 6190 EP 6196 DI 10.1021/ma00075a009 PG 7 WC Polymer Science SC Polymer Science GA MF859 UT WOS:A1993MF85900009 ER PT J AU KOLB, EW TKACHEV, II AF KOLB, EW TKACHEV, II TI AXION MINICLUSTERS AND BOSE STARS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INFLATION AB Evolution of inhomogeneities in the axion field around the QCD epoch is studied numerically, including for the first time important nonlinear effects. It is found that perturbations on scales corresponding to causally disconnected regions at T approximately 1 GeV can lead to very dense axion clumps, with present density rho(a) greater than or similar to 10(-8) g cm-3. This is high enough for the collisional 2a --> 2a process to lead to Bose-Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars. C1 RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW 117312,RUSSIA. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP KOLB, EW (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 16 TC 74 Z9 75 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 NOV 8 PY 1993 VL 71 IS 19 BP 3051 EP 3054 DI 10.1103/PhysRevLett.71.3051 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400003 ER PT J AU ARUNASALAM, V GREENE, GJ AF ARUNASALAM, V GREENE, GJ TI THERMALLY EXCITED PROTON SPIN-FLIP LASER-EMISSION IN TOKAMAKS SO PHYSICAL REVIEW LETTERS LA English DT Article AB Based on statistical thermodynamic fluctuation arguments, it is shown here for the first time that thermally excited spin-flip laser emission from the fusion product protons can occur in large tokamak devices that are entering the reactor regime of operation. Existing experimental data from TFTR support this conjecture, in the sense that these measurements are in complete agreement with the predictions of the quasilinear theory of the spin-flip laser. RP PRINCETON UNIV, PLASMA PHYS LAB, POB 451, PRINCETON, NJ 08543 USA. NR 19 TC 5 Z9 5 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 8 PY 1993 VL 71 IS 19 BP 3119 EP 3122 DI 10.1103/PhysRevLett.71.3119 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400020 ER PT J AU HIDALGO, C SANCHEZ, E ESTRADA, T BRANAS, B RITZ, CP UCKAN, T HARRIS, J WOOTTON, AJ AF HIDALGO, C SANCHEZ, E ESTRADA, T BRANAS, B RITZ, CP UCKAN, T HARRIS, J WOOTTON, AJ TI EXPERIMENTAL-EVIDENCE OF 3-WAVE COUPLING ON PLASMA TURBULENCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ATF TORSATRON; FLUCTUATIONS AB Experimental evidence of the nonlinear nature of the broadband edge fluctuations has been obtained in edge turbulence in the Advanced Toroidal Facility torsatron. Whereas little nonlinear wave interaction is found in the scrape-off layer region, three-wave coupling is enhanced in the plasma edge region (r < a(shear)). The degree of three-wave coupling strongly depends on the plasma conditions; it decreases in the temperature range (T(e) almost-equal-to 10 eV) where the ionization rates depend strongly on T(e) suggesting a link between ionization source and turbulence. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37931. UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712. RP HIDALGO, C (reprint author), ASOCIAC EURATOM CIEMAT,E-28040 MADRID,SPAIN. RI Sanchez, Edilberto/D-4620-2009; Estrada, Teresa/N-9048-2016 OI Sanchez, Edilberto/0000-0003-1062-7870; Estrada, Teresa/0000-0001-6205-2656 NR 13 TC 37 Z9 37 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 NOV 8 PY 1993 VL 71 IS 19 BP 3127 EP 3130 DI 10.1103/PhysRevLett.71.3127 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400022 ER PT J AU DURST, RD FONCK, RJ KIM, JS PAUL, SF BRETZ, N BUSH, C CHANG, Z HULSE, R AF DURST, RD FONCK, RJ KIM, JS PAUL, SF BRETZ, N BUSH, C CHANG, Z HULSE, R TI OBSERVATION OF A LOCALIZED TRANSITION FROM EDGE TO CORE DENSITY TURBULENCE IN THE TFTR TOKAMAK SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLUCTUATION MEASUREMENTS; TRANSPORT AB A localized transition zone is observed between turbulent, long-wavelength density fluctuations (k(perpendicular-to) < 2 cm-1) in the core and edge of beam-heated discharges in TFTR. The core turbulence is unimodal while the edge has two counterpropagating modes, both of which are spectrally distinct from the core fluctuations. The fluctuation amplitude in the core scales with the global energy confinement time while in the edge it does not. These observations suggest that distinct modes are responsible for turbulence in the two regions and that only the core mode is directly related to global confinement. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP DURST, RD (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706, USA. NR 15 TC 49 Z9 49 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 NOV 8 PY 1993 VL 71 IS 19 BP 3135 EP 3138 DI 10.1103/PhysRevLett.71.3135 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400024 ER PT J AU POLIAN, A GRIMSDITCH, M PHILIPPOT, E AF POLIAN, A GRIMSDITCH, M PHILIPPOT, E TI MEMORY EFFECTS IN PRESSURE-INDUCED AMORPHOUS ALPO4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID SIO2 ALPHA-QUARTZ; INDUCED AMORPHIZATION; TRANSITION; STATE; PHASE; RAMAN; SCATTERING; GLASS; SNI4 AB A Brillouin scattering study of the pressure dependence of the elastic properties of AlPO4 single crystals is presented. On increasing the pressure there is clear evidence of a phase transformation at 15 GPa; this is consistent with previous Raman and x-ray measurements which report an amorphous phase at high pressures. On decreasing the pressure the sample not only recrystallizes at almost-equal-to 7 GPa but it reverts to a single crystal with the initial crystallographic orientation. This surprising behavior confirms the claims, based on birefringence measurements, of Kruger and Jeanloz [Science 249, 647 (1990)]. Our results also indicate that, even in the amorphous phase, AlPO4 remains elastically anisotropic. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV MONTPELLIER 2,PHYSICOCHIM MAT SOLIDES LAB,F-34095 MONTPELLIER 05,FRANCE. RP POLIAN, A (reprint author), UNIV PARIS 06,B 77,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE. RI Polian, Alain/E-1555-2017 OI Polian, Alain/0000-0003-2261-9114 NR 31 TC 29 Z9 29 U1 0 U2 6 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 NOV 8 PY 1993 VL 71 IS 19 BP 3143 EP 3145 DI 10.1103/PhysRevLett.71.3143 PG 3 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400026 ER PT J AU WATSON, GM GIBBS, D ZEHNER, DM YOON, M MOCHRIE, SGJ AF WATSON, GM GIBBS, D ZEHNER, DM YOON, M MOCHRIE, SGJ TI FACETING TRANSFORMATIONS OF THE STEPPED PT(001) SURFACE SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEXAGONALLY RECONSTRUCTED PT(001); VICINAL SI(111); ORIENTATIONAL EPITAXY; PHASE-SEPARATION AB We describe x-ray scattering studies of the structure and morphology of a stepped Pt(001) surface between 300 and 1850 K. Two distinct faceting transformations are observed. Above 1820 K, we find an unreconstructed, stepped surface. Between 1820 and 1620 K, there is coexistence among hexagonally reconstructed, step-free domains and unreconstructed, stepped domains. The tilt angle of the unreconstructed domains exhibits a one-half power-law dependence on reduced temperature. At 1620 K, there is a second morphological transformation at which the unreconstructed domains are replaced by magic vicinals. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. RP WATSON, GM (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 14 TC 54 Z9 54 U1 0 U2 9 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 NOV 8 PY 1993 VL 71 IS 19 BP 3166 EP 3169 DI 10.1103/PhysRevLett.71.3166 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400032 ER PT J AU DEMELO, CARS RANDERIA, M ENGELBRECHT, JR AF DEMELO, CARS RANDERIA, M ENGELBRECHT, JR TI CROSSOVER FROM BCS TO BOSE SUPERCONDUCTIVITY - TRANSITION-TEMPERATURE AND TIME-DEPENDENT GINZBURG-LANDAU THEORY SO PHYSICAL REVIEW LETTERS LA English DT Article ID 2 DIMENSIONS; CONDENSATION; STATE; GAS AB We use functional integral formulation to study the finite temperature crossover from cooperative Cooper pairing to independent bound state formation and condensation, We show the inadequacy of mean field results for normal state properties obtained at the saddle point level as the coupling increases. The importance of quantum (temporal) fluctuations is pointed out and an interpolation scheme for T(c) is derived from this point of view. The time-dependent Ginzburg-Landau (TDGL) equation near T(c) is shown to describe a damped mode in the BCS limit, and a propagating one in the Bose limit. A singular point is identified at intermediate coupling where a simple TDGL description fails. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP DEMELO, CARS (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. NR 17 TC 561 Z9 561 U1 1 U2 30 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 NOV 8 PY 1993 VL 71 IS 19 BP 3202 EP 3205 DI 10.1103/PhysRevLett.71.3202 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400041 ER PT J AU BOYACK, KW TIESZEN, SR STAMPS, DW AF BOYACK, KW TIESZEN, SR STAMPS, DW TI INTERNAL-PRESSURE LOADS DUE TO GASEOUS DETONATIONS SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB The internal loading of structures and confinements by gaseous detonation is studied using a multidimensional strong-shock physics code. Hydrogen-air-steam mixtures are used in calculations to show phenomena that apply qualitatively to any detonable gaseous fuel-oxidant-diluent mixture. Several variables are considered with respect to loading: (a) inert layers of various thicknesses; (b) deflagration-to-detonation transition (DDT) location as compared with direct initiation; and (c) some variations in geometry or confinement. Relatively thin inert layers are shown to increase the peak reflected shock pressure over that which would occur if the inert layer were not there. Inert layers may also increase impulse under some circumstanceS. DDT increases peak reflected pressures over those seen for direct initiation because of precompression of unburned gases. DDT may also increase impulses. Peak reflected pressures and impulses are greater in edges and corners than on flat surfaces. Internal obstruction tends to randomize the energy in a detonation wave, decreasing the impulse on structures, and allowing the pressure to equilibrate more rapidly than if there were no obstruction. RP BOYACK, KW (reprint author), SANDIA NATL LABS,DEPT INNOVAT TECHNOL APPLICAT 6515,ALBUQUERQUE,NM 87185, USA. NR 24 TC 5 Z9 5 U1 1 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD NOV 8 PY 1993 VL 443 IS 1918 BP 343 EP 366 DI 10.1098/rspa.1993.0150 PG 24 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MG245 UT WOS:A1993MG24500006 ER PT J AU BARR, ME SMITH, PH ANTHOLINE, WE SPENCER, B AF BARR, ME SMITH, PH ANTHOLINE, WE SPENCER, B TI CRYSTALLOGRAPHIC, SPECTROSCOPIC AND THEORETICAL-STUDIES OF AN ELECTRON-DELOCALIZED CU(1.5)-CU(1.5) COMPLEX SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID LIGAND AB The mixed-valence complex [Cu2L]3+ 1 (L = {N[CH2CH2N(H)CH2CH2N(H)CH2CH2]3N]} has been shown from EPR, visible spectroscopic, and single-crystal X-ray diffraction measurements to possess an unpaired electron delocalized over a short Cu(1.5)-Cu(1.5) bond in both the hydrated nitrate [2.364(2) angstrom] and acetate [2.415(2) angstrom] salts: Fenske-Hall MO analysis reveals direct sigma-bonding interactions between the copper centres. C1 BELOIT COLL,DEPT CHEM,BELOIT,WI 53511. MED COLL WISCONSIN,NATL BIOMED ESR CTR,MILWAUKEE,WI 53226. RP BARR, ME (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 19 TC 85 Z9 85 U1 0 U2 6 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD NOV 7 PY 1993 IS 21 BP 1649 EP 1652 DI 10.1039/c39930001649 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA MG965 UT WOS:A1993MG96500033 ER PT J AU BAME, SJ GOLDSTEIN, BE GOSLING, JT HARVEY, JW MCCOMAS, DJ NEUGEBAUER, M PHILLIPS, JL AF BAME, SJ GOLDSTEIN, BE GOSLING, JT HARVEY, JW MCCOMAS, DJ NEUGEBAUER, M PHILLIPS, JL TI ULYSSES OBSERVATIONS OF A RECURRENT HIGH-SPEED SOLAR-WIND STREAM AND THE HELIOMAGNETIC STREAMER BELT SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CORONAL STREAMERS AB Near-ecliptic solar wind observations by Ulysses on its way to the polar regions of the Sun, compared with those from IMP 8 at 1 AU, showed that high-speed streams decay and broaden with heliocentric distance from IMP 8 to Ulysses, as expected. In July 1992 while travelling south at approximately 13-degrees-S and 5.3 AU, Ulysses encountered a recurrent high-speed stream, that may also have been observed at IMP 8. The stream has been observed a total of 14 times, once in each solar rotation through June 1993 at approximately 34-degrees-S. The source of the high-speed stream is an equatorward extension of the south polar coronal hole. From July 1992 through June 1993, averages of solar wind peak speed increased while density decreased with heliographic latitude. Both the stream and a low-speed, high-density flow, presumably associated with the heliomagnetic (coronal) streamer belt encircling the heliomagnetic equator, crossed Ulysses with the solar rotation period until April 1993 when the spacecraft was at approximately 29-degrees-S heliographic latitude. After this time, as the spacecraft climbed to higher latitudes, the central portion of the streamer belt with lowest speed and highest density disappeared. Therefore, at its maximum inclination, the belt was tilted at approximately 29-degrees to the heliographic equator at this point in the solar cycle. C1 NATL OPT ASTRON OBSERV,NATL SOLAR OBSERV,TUCSON,AZ 85726. JET PROP LAB,PASADENA,CA 91109. RP BAME, SJ (reprint author), LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,MS D466,LOS ALAMOS,NM 87545, USA. NR 11 TC 150 Z9 150 U1 0 U2 1 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 NOV 5 PY 1993 VL 20 IS 21 BP 2323 EP 2326 DI 10.1029/93GL02630 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MF829 UT WOS:A1993MF82900002 ER PT J AU SMITH, EJ NEUGEBAUER, M BALOGH, A BAME, SJ ERDOS, G FORSYTH, RJ GOLDSTEIN, BE PHILLIPS, JL TSURUTANI, BT AF SMITH, EJ NEUGEBAUER, M BALOGH, A BAME, SJ ERDOS, G FORSYTH, RJ GOLDSTEIN, BE PHILLIPS, JL TSURUTANI, BT TI DISAPPEARANCE OF THE HELIOSPHERIC SECTOR STRUCTURE AT ULYSSES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CURRENT SHEET AB In May, 1993, the heliospheric current sheet (HCS) ceased to be seen by the Ulysses spacecraft at a heliocentric latitude of approximately 30-degrees-S and distance of 4.7 AU. The disappearance of the HCS coincided with the solar wind speed remaining >560 km/s and with the disappearance of one of four interaction regions previously seen on each solar rotation. The heliographic latitude of the disappearance of die HCS at Ulysses was 11-degrees equatorward of the latitude of the magnetic neutral sheet computed at the source surface at 2.5 solar radii, and it occurred a half year earlier than predicted on the basis of the persistence of the time profile of the neutral sheet tilt from one solar cycle to the next. C1 LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,LOS ALAMOS,NM 87545. UNIV LONDON IMPERIAL COLL SCI & TECHNOL,BLACKETT LAB,LONDON SW7 2B7,ENGLAND. RP SMITH, EJ (reprint author), JET PROP LAB,MS 169-506,PASADENA,CA 91109, USA. NR 16 TC 104 Z9 104 U1 0 U2 0 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 NOV 5 PY 1993 VL 20 IS 21 BP 2327 EP 2330 DI 10.1029/93GL02632 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MF829 UT WOS:A1993MF82900003 ER PT J AU GOSLING, JT BAME, SJ FELDMAN, WC MCCOMAS, DJ PHILLIPS, JL GOLDSTEIN, BE AF GOSLING, JT BAME, SJ FELDMAN, WC MCCOMAS, DJ PHILLIPS, JL GOLDSTEIN, BE TI COUNTERSTREAMING SUPRATHERMAL ELECTRON EVENTS UPSTREAM OF COROTATING SHOCKS IN THE SOLAR-WIND BEYOND SIMILAR-TO-2AU-ULYSSES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID EARTHS BOW SHOCK; FLUX; AU AB Enhanced fluxes of suprathermal electrons are commonly observed upstream of corotating forward and reverse shocks in the solar wind at heliocentric distances beyond approximately 2 AU by the Los Alamos plasma experiment on Ulysses. The average duration of these events, which are most intense immediately upstream from the shocks and which fade with increasing distance from them, is approximately 2.4 days near 5 AU. These events are caused by the leakage of shock-heated electrons into the upstream region. The upstream regions of these shocks face back toward the Sun along the interplanetary magnetic field, so these leaked electrons commonly counterstream relative to the normal solar wind electron heat flux. The observations suggest that conservation of magnetic moment and scattering typically limit the sunward propagation of these electrons as beams to field-aligned distances of approximately 15 AU. Although it seems unlikely that these shock-associated events are an important source of counterstreaming events near 1 AU, remnants of the backstreaming beams may contribute importantly to the diffuse solar wind halo electron population there. C1 JET PROP LAB,PASADENA,CA 91109. RP GOSLING, JT (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 13 TC 64 Z9 64 U1 0 U2 1 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 NOV 5 PY 1993 VL 20 IS 21 BP 2335 EP 2338 DI 10.1029/93GL02489 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MF829 UT WOS:A1993MF82900005 ER PT J AU WRAGG, JL CHAMBERLAIN, JE CHANN, L WHITE, HW SUGAMA, T MANALIS, S AF WRAGG, JL CHAMBERLAIN, JE CHANN, L WHITE, HW SUGAMA, T MANALIS, S TI CHARACTERIZATION OF POLYACRYLIC-ACID MODIFIED ZINC PHOSPHATE CRYSTAL CONVERSION COATINGS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article AB Raman spectroscopy and atomic force microscopy have been used to investigate the composition and surface structure of polyacrylic acid modified zinc phosphate crystal conversion coatings on steel. Zinc phosphate coatings are used extensively to provide corrosion protection and to improve adherence of topcoatings to steel. Within the last few years it has been demonstrated that addition of high molecular weight polyacrylic acid (PAA) to the phosphating bath can significantly improve both resistance to corrosion and topcoat adherence. It has been reported that the addition of PAA reduces the size of crystallites, which leads to greater film ductility, and therefore to fewer sites for corrosive attack, and that organic molecular segments from the PAA are incorporated into the surface structure and provide additional adhesive bonding with polymeric topcoats. In this work Raman spectra show the compositions of both unmodified and PAA modified films to be zinc phosphate dihydrate, Zn3(PO4)2.2H2O. Atomic force microscopy (AFM) was used to measure the morphologies of single crystallite surfaces. Morphologies of the unmodified and modified films obtained by AFM are in general quite similar, but subtle differences are apparent. (C) 1993 John Wiley & Sons, Inc. C1 UNIV MISSOURI,DEPT PHYS & ASTRON,COLUMBIA,MO 65211. DIGITAL INSTRUMENTS INC,SANTA BARBARA,CA 93117. BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973. NR 5 TC 5 Z9 5 U1 2 U2 4 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 NOV 5 PY 1993 VL 50 IS 5 BP 917 EP 928 DI 10.1002/app.1993.070500520 PG 12 WC Polymer Science SC Polymer Science GA MC015 UT WOS:A1993MC01500020 ER PT J AU TURNER, MS AF TURNER, MS TI WHY IS THE TEMPERATURE OF THE UNIVERSE 2.726-KELVIN SO SCIENCE LA English DT Article ID GRAND-UNIFIED THEORIES; LARGE-SCALE STRUCTURE; COLD DARK MATTER; MICROWAVE BACKGROUND-RADIATION; MINIMAL ISOCURVATURE MODEL; PECULIAR VELOCITY-FIELD; INFLATIONARY UNIVERSE; INVISIBLE AXION; ANISOTROPY; FLATNESS AB The Cosmic Background Explorer satellite has recently made the most accurate measurement of the temperature of the universe, determining it to be 2.726 +/- 0.01 kelvin. In trying to understand why the temperature has this value, one is led to discover the most fundamental features of the universe-an early, radiation-dominated epoch, enormous entropy per nucleon, synthesis of the light elements around 3 minutes after the bang, and a small excess of matter over antimatter-as well as some of the most pressing issues in cosmology today-the development of structure in the universe and the identification of the nature of the ubiquitous dark matter. C1 UNIV CHICAGO, ENRICO FERMI INST, DEPT ASTRON & ASTROPHYS, CHICAGO, IL 60637 USA. FERMILAB NATL ACCELERATOR LAB, DEPT THEORET ASTROPHYS, BATAVIA, IL 60510 USA. RP TURNER, MS (reprint author), UNIV CHICAGO, ENRICO FERMI INST, DEPT PHYS, CHICAGO, IL 60637 USA. NR 80 TC 18 Z9 19 U1 1 U2 2 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 NOV 5 PY 1993 VL 262 IS 5135 BP 861 EP 867 DI 10.1126/science.262.5135.861 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MF438 UT WOS:A1993MF43800025 PM 17757353 ER PT J AU SEVOV, SC CORBETT, JD AF SEVOV, SC CORBETT, JD TI CARBON-FREE FULLERENES - CONDENSED AND STUFFED ANIONIC EXAMPLES IN INDIUM SYSTEMS SO SCIENCE LA English DT Article ID INTERMETALLIC COMPOUNDS; CLUSTERS AB Condensed, well-ordered analogs of the fullerenes occur in the hexagonal phases Na96In97Z2 (Z = nickel, palladium, or platinum). Large cages of In74 (D3h) and M60 (= In48Na12, D3d) share pentagonal faces to generate a double-hexagonal close-packed analog of NiAs. All these polyhedra are centered by partially disordered In10Z clusters within deltahedra of sodium atoms that cap all inner faces of the cages, namely, Z@In10@Na39@In74 and Z@In10@Na32@Na12In48 ''onions.'' The highest filled bands in these compounds apparently involve localized electron pairs on surface features on In74-based layers. Structural and electronic relations between diamond and NaIn (stuffed diamond structure) parallel those between certain fullerenes and Na96In97Z2 and, presumably, other valence-driven intermetallic phases. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 27 TC 68 Z9 68 U1 3 U2 11 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 5 PY 1993 VL 262 IS 5135 BP 880 EP 883 DI 10.1126/science.262.5135.880 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MF438 UT WOS:A1993MF43800029 PM 17757355 ER PT J AU GAKH, AA TUINMAN, AA ADCOCK, JL COMPTON, RN AF GAKH, AA TUINMAN, AA ADCOCK, JL COMPTON, RN TI HIGHLY FLUORINATED FULLERENES AS OXIDIZERS AND FLUORINATING AGENTS SO TETRAHEDRON LETTERS LA English DT Article ID N-FLUOROPYRIDINIUM SALTS; NUCLEOPHILIC-SUBSTITUTION; ELECTROPHILIC FLUORINATIONS; C-60 AB Contrary to the chemistry of ''standard'' fluorocarbons, highly fluorinated fullerenes (C60F44 - C60F46) display distinct oxidizing and fluorinating properties. They liberate iodine from NaI solutions, oxidize isopropanol to acetone, and fluorinate aromatic compounds in the presence of acid catalysts such as BF3.Et2O. Fluoroaromatic products are also generated in the reaction of these fluorofullerenes with organolithium reagents. Even the relatively unreactive heterocycle pyridine is fluorinated by the higher fluorofullerenes. Reaction mechanisms are proposed to explain these observations. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 14 TC 30 Z9 31 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD NOV 5 PY 1993 VL 34 IS 45 BP 7167 EP 7170 DI 10.1016/S0040-4039(00)79278-1 PG 4 WC Chemistry, Organic SC Chemistry GA MF216 UT WOS:A1993MF21600004 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI HEAT OF FORMATION OF CH2OH AND D0(H-CH2OH) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BOND-DISSOCIATION ENERGIES; HYDROXYMETHYL; METHANOL; CH3O AB The appearance potential (AP) of CH2OH+ from CH3OH has been reexamined by photoionization mass spectrometry, using higher resolution, better statistics, and a more extensive analysis. The result, AP(CH2-OH+/CH3OH) = 11.649 +/- 0.003 eV, when combined with IP(CH2OH) = 7.549 +/- 0.006 eV, yields D0(H-CH2OH) = 395.6 +/- 0.6 kJ/mol. Other quantities which can be derived from this value include D298, DELTAH(f)-degrees (CH2OH) at 0 and 298 K and the proton affinity of CH2O. A prior thermochemically deduced value for DELTAH(f)degrees 298 (CH2OH) is corrected, utilizing a hindered rotor in calculating S-degrees298(CH2OH). The revised value, DELTAH(f)degrees 298 (CH2OH) = -12.2 +/- 1.7 kJ/mol, still differs from the present value, -16.6 +/- 0.9 kJ/mol, but a recent high-quality ab initio calculation is in good agreement with the present result. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 27 TC 58 Z9 58 U1 0 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 NOV 4 PY 1993 VL 97 IS 44 BP 11451 EP 11455 DI 10.1021/j100146a018 PG 5 WC Chemistry, Physical SC Chemistry GA MF523 UT WOS:A1993MF52300018 ER PT J AU OGAWA, MY WISHART, JF YOUNG, ZY MILLER, JR ISIED, SS AF OGAWA, MY WISHART, JF YOUNG, ZY MILLER, JR ISIED, SS TI DISTANCE DEPENDENCE OF INTRAMOLECULAR ELECTRON-TRANSFER ACROSS OLIGOPROLINES IN [(BPY)2RUIIL-(PRO)N-COIII(NH3)5]3+, N = 1-6 - DIFFERENT EFFECTS FOR HELICAL AND NONHELICAL POLYPROLINE-II STRUCTURES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HEART CYTOCHROME-C; PULSE-RADIOLYSIS; POLYPEPTIDE-CHAIN; TRANSFER RATES; AMINO-ACIDS; CIRCULAR-DICHROISM; PEPTIDE FORMATION; BRIDGING LIGANDS; TUNNELING PATHS; PROTEINS AB A series of complexes of the type [(bpy)2RuIIL-(Pro)n-CoIII(NH3)5]4+, n = 1-6, where L = 4-carboxy-4'-methyl-2,2'-bipyridine, bpy = 4,4'-bipyridine, and Pro = l-proline, have been synthesized from the corresponding [(bpy)2RuIIL] and [(NH3)5CoIII(Pro)n] components. The compounds were characterized by metal analyses, electrochemical measurements, and absorption spectroscopy. For n = 4-6 prolines, the CD spectra of the complexes show a polyproline II helical structure. Intramolecular electron transfer within these complexes was studied by generating the [(bpy)2RuIIL.-(Pro)n-CoIII(NH3)5] intermediate by the reaction of e(aq) (generated by pulse radiolysis) with the [(bpy)2RuIIL-(Pro)n-CoIII(NH3)5] molecules. The driving force for this reaction is estimated to be \DELTAG-degrees\ approximately -1.1 V. The intramolecular electron transfer rates (k) and activation parameters (DELTAH(double dagger) (kcal/mol), DELTAS(double dagger) (eu)) found for these studies were (1.6 +/- 0.1) X 10(7) s-1, 6.0 +/- 0.6, -6 +/- 2; (2.3 +/- 0.2) x 10(5) s-1, 9.2 +/- 0.4, -3 +/- 1; (5.1 +/- 0.4) X 10(4) s-1, 9.4 +/- 0.2, -5.5 +/- 0.8; (1.8 +/- 0.1) x 10(4) S-1, 9.0 +/- 0.4, -9 +/- 1; and (8.9 +/- 0.6) X 10(3) S-1, 8.8 +/- 0.4, -11 +/- 1 for n = 2-6, respectively. For n = 1 proline, k is >5 X 10(8) s-1 and no temperature dependence could be determined. The rates of intramolecular electron transfer decrease rapidly with distance for n = 1-3 prolines but show a surprisingly weak decrease with distance for the n = 4, 5, and 6 prolines, which exhibit the polyproline II helical structure. The electron-transfer pathways within these molecules and the relationship of the electron-transfer rates to the helical polyproline II structure are discussed. C1 RUTGERS UNIV,DEPT CHEM,PISCATAWAY,NJ 08855. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. ARGONNE NATL LAB,DEPT CHEM,ARGONNE,IL 60439. RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 75 TC 73 Z9 73 U1 0 U2 12 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 NOV 4 PY 1993 VL 97 IS 44 BP 11456 EP 11463 DI 10.1021/j100146a019 PG 8 WC Chemistry, Physical SC Chemistry GA MF523 UT WOS:A1993MF52300019 ER PT J AU PARMETER, JE AF PARMETER, JE TI COPPER CVD CHEMISTRY ON A REACTIVE SUBSTRATE - CU(HFAC)2 AND HFACH ON PT(111) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; CHEMISORPTION; FILMS; HEXAFLUOROACETYLACETONATE; SPECTROSCOPY; ADSORPTION; CO AB The chemistry of the copper CVD precursor Cu(hfaC)2 and of the related hfacH molecule on the Pt(111) surface has been investigated using vibrational (FTIR) spectroscopy, thermal desorption measurements, and Auger spectroscopy. At high coverages, Cu(hfac)2 adsorption leads to the formation of a 'standing-up'' hfac [OC(CF3)CHC(CF3)O], adsorbed with its OCCCO skeleton essentially perpendicular to the surface. In the case of hfacH adsorption, and also for lower coverages of Cu(hfac)2, a different surface species is formed that is tentatively identified as ''lying-down'' hfac, i.e., hfac adsorbed with the OCCCO plane essentially parallel to the surface. The hfac species begin to decompose below 300 K. In the case of a saturated layer of hfacH, a large mass 69 (CF3+) thermal desorption signal is observed centered near 295 K, accompanied by the formation on the surface of both carbon monoxide and fluorine containing fragments. The carbon monoxide desorbs near 430 K, with nearly simultaneous HF desorption. Above this temperature, only two fluorocarbon species are present on the surface in significant concentration. The first (unidentified) fragment is characterized by an intense CF stretch near 1250 cm-1. Between 450 and 750 K it converts to adsorbed CF2, which desorbs or decomposes below 850 K. Decomposition of the ''standing-up'' hfac formed from Cu(hfac)2 is similar in most respects. These results are compared to those obtained on copper surfaces, and the implications for the CVD of copper onto more reactive substrates are discussed. RP PARMETER, JE (reprint author), SANDIA NATL LABS, DEPT 1126, ALBUQUERQUE, NM 87185 USA. NR 34 TC 38 Z9 38 U1 1 U2 5 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 NOV 4 PY 1993 VL 97 IS 44 BP 11530 EP 11541 DI 10.1021/j100146a030 PG 12 WC Chemistry, Physical SC Chemistry GA MF523 UT WOS:A1993MF52300030 ER PT J AU FENIMORE, EE EPSTEIN, RI HO, C KLEBESADEL, RW LACEY, C LAROS, JG MEIER, M STROHMAYER, T PENDLETON, G FISHMAN, G KOUVELIOTOU, C MEEGAN, C AF FENIMORE, EE EPSTEIN, RI HO, C KLEBESADEL, RW LACEY, C LAROS, JG MEIER, M STROHMAYER, T PENDLETON, G FISHMAN, G KOUVELIOTOU, C MEEGAN, C TI THE INTRINSIC LUMINOSITY OF GAMMA-RAY BURSTS AND THEIR HOST GALAXIES SO NATURE LA English DT Article ID EVOLUTION; MODELS AB THE Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory has shown that, although gamma-ray bursts are distributed isotropically on the sky, there is an apparent dearth of weak events compared to those expected from a homogeneous distribution of sources1,2. This suggests that the bursts originate either in an extended galactic halo3 (that is, locally) or at cosmological distances4,5. The intensity distribution of the bursts can be used to constrain their source properties and spatial distribution, and here we address this question by considering the BATSE data with those from the Pioneer Venus Orbiter, correcting for the different reponse of the two instruments. We show that the composite intensity distribution can after all be fitted by a simple, homogeneous model of gamma-ray burst sources with identical intrinsic luminosities where the faintest BATSE events are at a redshift of z approximately 0.80+/-0.05. We obtain an upper limit of about -18 on the absolute magnitude of the host galaxies by assigning model-derived distances to the brightest extragalactic objects found15 within the error boxes of eight well localized gamma-ray bursts. All but the faintest active galaxies are excluded as the source of the bursts. The bursts may instead be associated with normal galaxies, but only if the host-galaxy magnitudes are close to our upper limit. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. RP FENIMORE, EE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 22 TC 151 Z9 152 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 4 PY 1993 VL 366 IS 6450 BP 40 EP 42 DI 10.1038/366040a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MF007 UT WOS:A1993MF00700046 ER PT J AU REHM, KE ESBENSEN, H GEHRING, J GLAGOLA, B HENDERSON, D KUTSCHERA, W PAUL, M SORAMEL, F WUOSMAA, AH AF REHM, KE ESBENSEN, H GEHRING, J GLAGOLA, B HENDERSON, D KUTSCHERA, W PAUL, M SORAMEL, F WUOSMAA, AH TI SUBBARRIER FUSION CROSS-SECTIONS IN NI-58,64+MO-92,100 STUDIED WITH THE GAS-FILLED MAGNET TECHNIQUE SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION FUSION; SUBBARRIER FUSION; COULOMB BARRIER; ELASTIC-SCATTERING; NECK FORMATION; DISTRIBUTIONS; SYSTEMS AB Cross sections for evaporation residue formation in the systems Ni-58, Ni-64 + Mo-92, Mo-100 have been measured over a large range of energies using the gas-filled magnet technique for the separation of projectiles and evaporation residues. Contrary to the results of previous studies, good agreement between the experimental data and coupled-channel calculations is observed for both, excitation functions and spin distributions for Ni-64 + Mo-100. C1 HEBREW UNIV JERUSALEM,JERUSALEM,ISRAEL. UNIV PADUA,PADUA,ITALY. RP REHM, KE (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 27 TC 14 Z9 14 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 NOV 4 PY 1993 VL 317 IS 1-2 BP 31 EP 35 DI 10.1016/0370-2693(93)91565-5 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF132 UT WOS:A1993MF13200006 ER PT J AU MAYLE, R SCHRAMM, DN TURNER, MS WILSON, JR AF MAYLE, R SCHRAMM, DN TURNER, MS WILSON, JR TI CONSTRAINTS ON DIRAC NEUTRINOS FROM SN-1987A SO PHYSICS LETTERS B LA English DT Article ID SUPERNOVA 1987A; NUCLEAR-MATTER; SN1987A; CONDENSATION; MASSES; AXIONS; BURST AB The Livermore Supernova Explosion Code was used to calculate the effect of a massive Dirac neutrino on neutrino emission from SN 1987A in a self-consistent manner. Spin-flip interactions involving neutrino-nucleon, nucleon-nucleon and pion-nucleon collisions lead to the copious emission of sterile, right-handed neutrinos and cool the core faster than the observed neutrino emission time for Dirac masses exceeding about 3 keV. These limits are compared with the previous limits of Burrows et al. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP MAYLE, R (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 32 TC 17 Z9 17 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 NOV 4 PY 1993 VL 317 IS 1-2 BP 119 EP 124 DI 10.1016/0370-2693(93)91580-G PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF132 UT WOS:A1993MF13200021 ER PT J AU BERNARD, C SHEN, Y SONI, A AF BERNARD, C SHEN, Y SONI, A TI A LATTICE CALCULATION OF THE ISGUR-WISE FUNCTION SO PHYSICS LETTERS B LA English DT Article ID MESON DECAY CONSTANTS; SEMILEPTONIC DECAYS; FORM-FACTORS; EXTRACTION; OPERATORS; VCB AB We calculate the Isgur-Wise function (xi0) by measuring the heavy-heavy meson transition matrix element on the lattice in the quenched approximation. The standard Wilson action is used for both the heavy and the light quarks. Our numerical results are compared with various model calculations and experimental data. In particular, using a linear fit, we find rho2 = 1.24 +/- 0.26 +/- 0.33 (The slope of xi0 at the zero-recoil point is -rho2). Using instead the parametrization of xi0 suggested by Neubert and Rieckert and fitting the lattice data up to nu . nu' - 1.2, we find rho(NR)2 = 1.41 +/- 0.19 +/- 0.38. C1 BOSTON UNIV, DEPT PHYS, BOSTON, MA 02215 USA. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. NR 33 TC 39 Z9 39 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 4 PY 1993 VL 317 IS 1-2 BP 164 EP 172 DI 10.1016/0370-2693(93)91587-D PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF132 UT WOS:A1993MF13200028 ER PT J AU CARLSON, CE LASSILA, KE AF CARLSON, CE LASSILA, KE TI NEUTRINO PROBES TO COMPARE 6-QUARK AND 2-NUCLEON STATES SO PHYSICS LETTERS B LA English DT Article ID DIQUARK FRAGMENTATION; NUCLEI; QUARK; SCATTERING; PROTONS; LEPTON AB An interesting QCD object is the color-singlet six-quark system which can exist in nuclei but must be distinguished from the two-nucleon correlations. We discuss measurements which can discriminate six-quark systems from two-nucleon correlations and illustrate expectations for neutrinos and antineutrinos incident on deuterons and neon. C1 IOWA STATE UNIV SCI & TECHNOL, DOE, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. UNIV WARSAW, SOLTAN INST NUCL PHYS, PL-00681 WARSAW, POLAND. RP CARLSON, CE (reprint author), COLL WILLIAM & MARY, DEPT PHYS, WILLIAMSBURG, VA 23187 USA. 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 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 4 PY 1993 VL 317 IS 1-2 BP 205 EP 212 DI 10.1016/0370-2693(93)91594-D PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF132 UT WOS:A1993MF13200035 ER PT J AU KOSTELECKY, VA NIETO, MM AF KOSTELECKY, VA NIETO, MM TI BOUNDING THE PHOTON MASS WITH SOLAR PROBES SO PHYSICS LETTERS B LA English DT Article ID MAGNETIC-FIELD; LIMIT AB Proposed close-encounter solar probes (Vulcan and Solar Probe) are planned to have highly eccentric orbits, with a perihelion of about 4R(S) and an inclination close to 90-degrees out of the plane of the ecliptic. We show this could allow at least an order-of-magnitude improvement in the present directly measured limit on the photon mass. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP KOSTELECKY, VA (reprint author), INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405, USA. NR 23 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 NOV 4 PY 1993 VL 317 IS 1-2 BP 223 EP 226 DI 10.1016/0370-2693(93)91597-G PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MF132 UT WOS:A1993MF13200038 ER PT J AU BLANK, ML SMITH, ZL SNYDER, F AF BLANK, ML SMITH, ZL SNYDER, F TI ARACHIDONATE-CONTAINING TRIACYLGLYCEROLS - BIOSYNTHESIS AND A LIPOLYTIC MECHANISM FOR THE RELEASE AND TRANSFER OF ARACHIDONATE TO PHOSPHOLIPIDS IN HL-60 CELLS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE TRIACYLGLYCEROL; TRIARACHIDONOYLGLYCEROL; TRIACYLGLYCEROL BIOSYNTHESIS; ARACHIDONIC ACID; PHOSPHOLIPID; LIPOLYSIS; TRIACYLGLYCEROL LIPASE ID PLATELET-ACTIVATING-FACTOR; HUMAN-NEUTROPHILS; FATTY-ACIDS; PAF-ACETHER; METABOLISM; DIFFERENTIATION; PHOSPHOGLYCERIDES; ETHANOLAMINE; CHOLINE AB When HL-60 cells are incubated in media containing 10 muM [H-3]arachidonic acid the label is immediately incorporated into both triacylglycerols and phospholipids. About one-half of the cellular tritium was associated with triacylglycerols after 2 h of incubation and this [H-3]arachidonate was then transferred to phospholipids as soon as the labeled cells were placed in arachidonate-free media. A technique was devised to analyze the stereospecific distribution of [H-3]arachidonate at the three sn-positions of glycerol in order to identify the mechanism(s) responsible for the biosynthesis of the labeled triacylglycerols. [H-3]Arachidonate was found to be distributed in nearly equal amounts among all three glycerol positions of the triacylglycerols. In addition, analysis of intact triacylglycerols containing [H-3]arachidonate revealed that 24% of the tritium eluted from reverse-phase HPLC with triarachidonoylglycerol. Both of these findings would be expected if a significant portion of the arachidonate-containing triacylglycerols were synthesized de novo. Homogenates prepared from [H-3]arachidonate prelabeled HL-60 cells were capable of hydrolyzing the endogenous [H-3]arachidonate-containing triacylglycerols to produce mainly free fatty acids and smaller amounts of monoacylglycerols. The relatively small amount of monoacyl- and diacylglycerols produced by the lipolytic activity of the homogenates indicated that [H-3]arachidonate was hydrolyzed from all three sn-positions of the [H-3]triacylglycerols. This lipase activity had a pH optimum of 4.5 and was associated to a greater extent with the soluble fraction than in the total membrane fraction. Although it is not known whether this lipolytic activity is the same as that expressed in the intact cells, the activity of the cell-free triacylglycerol lipase was of sufficient magnitude to have easily accounted for the decrease in [H-3]triacylglycerols that was observed after transfer of the intact HL-60 cells (prelabeled with [H-3]arachidonate) to fresh media. The data suggest that transfer of arachidonate from triacylglycerols to phospholipids probably occurs through an acyltransferase utilizing a lysophospholipid and arachidonoyl-CoA. C1 OAK RIDGE INST SCI & EDUC,DIV MED SCI,POB 117,OAK RIDGE,TN 37831. FU NHLBI NIH HHS [HL35495-06A1, HL27109-12A1]; NIDDK NIH HHS [R01 DK42804-02A1] NR 27 TC 23 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD NOV 3 PY 1993 VL 1170 IS 3 BP 275 EP 282 DI 10.1016/0005-2760(93)90010-7 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA MF890 UT WOS:A1993MF89000008 PM 8218346 ER PT J AU WASIELEWSKI, MR GAINES, GL WIEDERRECHT, GP SVEC, WA NIEMCZYK, MP AF WASIELEWSKI, MR GAINES, GL WIEDERRECHT, GP SVEC, WA NIEMCZYK, MP TI BIOMIMETIC MODELING OF PHOTOSYNTHETIC REACTION-CENTER FUNCTION - LONG-LIVED, SPIN-POLARIZED RADICAL-ION PAIR FORMATION IN CHLOROPHYLL-PORPHYRIN-QUINONE TRIADS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID COVALENTLY LINKED PORPHYRIN; TIME-RESOLVED EPR; ELECTRON-TRANSFER; PHOTOCHEMISTRY; TEMPERATURE; PICOSECOND; DEPENDENCE; MOLECULES; RESONANCE; ENERGY RP WASIELEWSKI, MR (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 25 TC 63 Z9 63 U1 0 U2 8 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 NOV 3 PY 1993 VL 115 IS 22 BP 10442 EP 10443 DI 10.1021/ja00075a103 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MF517 UT WOS:A1993MF51700103 ER PT J AU BURGER, P BERGMAN, RG AF BURGER, P BERGMAN, RG TI FACILE INTERMOLECULAR ACTIVATION OF C-H BONDS IN METHANE AND OTHER HYDROCARBONS AND SI-H BONDS IN SILANES WITH THE IR(III) COMPLEX CP-ASTERISK-(PME3)IR(CH3)(OTF) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID AROMATIC METALATION; UNUSUAL REACTIVITY; IRIDIUM; RHODIUM; PERMETHYLSCANDOCENE; IODOBENZENE; DERIVATIVES; CHEMISTRY; ALKYL C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 23 TC 229 Z9 229 U1 1 U2 15 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 NOV 3 PY 1993 VL 115 IS 22 BP 10462 EP 10463 DI 10.1021/ja00075a113 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MF517 UT WOS:A1993MF51700113 ER PT J AU KING, JA VOLLHARDT, KPC AF KING, JA VOLLHARDT, KPC TI THE THERMALLY-INDUCED PROTOTROPIC ISOMERIZATION OF ETA-4-1,3-DIALKENES, ETA-4-1,4-DIALKENES, ETA-4-1,5-DIALKENES COMPLEXED TO (ETA-5-CYCLOPENTADIENYL)COBALT SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID TRANSITION-METALS; DIENE COMPLEXES; CHEMISTRY; MECHANISM; HYDROGEN; HYDRIDE; OLEFINS; 1,3-BUTADIENE; ACTIVATION; FEATURES AB This study reports a series of facile, thermally-induced, prototropic isomerizations of eta4-1,4- and eta4-1,5-dienes of (eta5-cyclopentadienyl)cobalt to their corresponding eta4-1,3-complexes. The data indicate the E-isomers to be thermodynamically favored over the Z-isomers. Furthermore, in the case of eta4-hexadiene complexes, the eta4-2,4-EE-isomer is observed to be thermodynamically preferred relative to either the eta4-2,4-E,Z- or eta4-1,3-E-isomers. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 39 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD NOV 2 PY 1993 VL 460 IS 1 BP 91 EP 96 DI 10.1016/0022-328X(93)80363-G PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA ME911 UT WOS:A1993ME91100014 ER PT J AU SZOKE, A AF SZOKE, A TI HOLOGRAPHIC METHODS IN X-RAY CRYSTALLOGRAPHY .2. DETAILED THEORY AND CONNECTION TO OTHER METHODS OF CRYSTALLOGRAPHY SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID SAMPLING THEOREM; LOW-RESOLUTION; PHASE PROBLEM; PROTEIN; CONFORMATION; DIFFRACTION; REFINEMENT; PREDICTION AB Equations are derived for finding an unknown part of the electron density in the unit cell of a crystal when part of the structure of its contents is already known. These equations are based on the similarity of the X-ray diffraction pattern to a hologram. The X-ray field scattered by the known part of the structure is identified as the holographic reference beam. It interferes with the waves scattered from the unknown part of the structure. The interference pattern contains phase information that can be exploited to recover fully the unknown part of the structure. This paper discusses mathematical properties of the resulting equations and some methods for their solution. A strong similarity to inverse problems of image processing is pointed out and connections to other known methods of X-ray crystallography are established. In paper III [Maalouf, Hoch, Stern, Szoke & Szoke (1993). Acta Cryst. A49, 866-871], some modest numerical simulations are presented. RP SZOKE, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 54 TC 43 Z9 43 U1 0 U2 1 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 NOV 1 PY 1993 VL 49 BP 853 EP 866 DI 10.1107/S0108767393004076 PN 6 PG 14 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA MJ512 UT WOS:A1993MJ51200007 ER PT J AU DOHRMANN, CR BUSBY, HR AF DOHRMANN, CR BUSBY, HR TI SPIN STABILITY OF UNDAMPED FLEXIBLE STRUCTURES ROTATING ABOUT THE MINOR AXIS SO AIAA JOURNAL LA English DT Article AB A method is presented for determining the nonlinear stability of undamped flexible structures spinning about the axis of minimum moment of inertia. Equations of motion are developed for structures that are free of applied forces and moments. The development makes use of a floating reference frame which follows the overall rigid body motion. Within this frame, elastic deformations are assumed to be given functions of n generalized coordinates. A transformation of variables is devised which shows the equivalence of the equations of motion to a Hamiltonian system with n + 1 degrees of freedom. Using this equivalence, stability criteria are developed based on the normal form of the Hamiltonian. It is shown that a motion which is spin stable in the linear approximation may be unstable when nonlinear terms are included. A stability analysis of a simple flexible structure is provided to demonstrate the application of the stability criteria. Results from numerical integration of the equations of motion are shown to be consistent with the predictions of the stability analysis. C1 OHIO STATE UNIV,DEPT MECH ENGN,COLUMBUS,OH 43210. RP DOHRMANN, CR (reprint author), SANDIA NATL LABS,DEPT STRUCT DYNAM,DEPT 1434,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 16 TC 2 Z9 3 U1 0 U2 0 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 NOV PY 1993 VL 31 IS 11 BP 2154 EP 2162 DI 10.2514/3.11904 PG 9 WC Engineering, Aerospace SC Engineering GA MF793 UT WOS:A1993MF79300026 ER PT J AU SCHIERENBECK, KA MARSHALL, JD AF SCHIERENBECK, KA MARSHALL, JD TI SEASONAL AND DIURNAL PATTERNS OF PHOTOSYNTHETIC GAS-EXCHANGE FOR LONICERA-SEMPERVIRENS AND L-JAPONICA (CAPRIFOLIACEAE) SO AMERICAN JOURNAL OF BOTANY LA English DT Article ID SOUTHERN WISCONSIN; PUERARIA-LOBATA; WATER RELATIONS; NATIVE SHRUBS; CARBON GAIN; GROWTH; FOREST; FIELD; VINES; ECOPHYSIOLOGY AB Photosynthesis, stomatal conductance, and water use efficiency were compared between Lonicera japonica (Japanese honeysuckle), an invasive species in the southeastern United States, and its native congener, Lonicera sempervirens (coral honeysuckle), to determine the role of seasonal patterns of water loss and carbon gain in the invasive ability of the exotic. Diurnal measurements were taken monthly for 1 year under a closed forest canopy and in an open field. There were few significant differences in photosynthetic rates between the two species in either environment. However, at both sites, Lonicera japonica retained its old leaves over winter while old leaves of L. sempervirens senesced. Also, new leaves of L. japonica had significantly higher photosynthetic rates than the emerging leaves of L. sempervirens (6.2 vs. 4.4 mumol M-2 sec-1 under the canopy; 4.4 vs. 3.0 mumol m-2 sec-1 in the open). Although differences in conductance and water use efficiency between species were seldom significant, L. japonica tended to have higher maximum values than L. sempervirens. Retention of old leaves by L. japonica during new leaf formation (January-March) as well as higher photosynthetic rates in new leaves contribute to greater annual carbon gain and help explain the invasive ability of Japanese honeysuckle. C1 WASHINGTON STATE UNIV,DEPT BOT,PULLMAN,WA 99163. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29202. UNIV IDAHO,DEPT FORESTRY,MOSCOW,ID 83843. NR 50 TC 27 Z9 29 U1 0 U2 16 PU BOTANICAL SOC AMER INC PI COLUMBUS PA OHIO STATE UNIV-DEPT BOTANY 1735 NEIL AVE, COLUMBUS, OH 43210 SN 0002-9122 J9 AM J BOT JI Am. J. Bot. PD NOV PY 1993 VL 80 IS 11 BP 1292 EP 1299 DI 10.2307/2445713 PG 8 WC Plant Sciences SC Plant Sciences GA MH154 UT WOS:A1993MH15400008 ER PT J AU WEBER, JL WANG, ZY HANSEN, K STEPHENSON, M KAPPEL, C SALZMAN, S WILKIE, PJ KEATS, B DRACOPOLI, NC BRANDRIFF, BF OLSEN, AS AF WEBER, JL WANG, ZY HANSEN, K STEPHENSON, M KAPPEL, C SALZMAN, S WILKIE, PJ KEATS, B DRACOPOLI, NC BRANDRIFF, BF OLSEN, AS TI EVIDENCE FOR HUMAN MEIOTIC RECOMBINATION INTERFERENCE OBTAINED THROUGH CONSTRUCTION OF A SHORT TANDEM REPEAT-POLYMORPHISM LINKAGE MAP OF CHROMOSOME-19 SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID HIGH-RESOLUTION; DNA POLYMORPHISMS; GENE CONVERSIONS; COSMID CONTIGS; RYR1 LOCUS; CEA-GENE; MOUSE; LOCALIZATION; REGION; EXCLUSION AB An improved linkage map for human chromosome 19 containing 35 short tandem repeat polymorphisms (STRPs) and one VNTR (D19S20) was constructed. The map included 12 new (GATA)n tetranucleotide STRPs. Although total lengths of the male (114 cM) and female (128 cM) maps were similar, at both ends of the chromosome male recombination exceeded female recombination, while in the interior portion of the map female recombination was in excess. Cosmid clones containing the STRP sequences were identified and were positioned along the chromosome by fluorescent in situ hybridization. Four rounds of careful checking and removal of genotyping errors allowed biologically relevant conclusions to be made concerning the numbers and distributions of recombination events on chromosome 19. The average numbers of recombinations per chromosome matched closely the lengths of the genetic maps computed by using the program CRIMAP. Significant numbers of chromosomes with zero, one, two, or three recombinations were detected as products of both female and male meioses. On the basis of the total number of observed pairs of recombination events in which only a single informative marker was situated between the two recombinations, a maximal estimate for the rate of meiotic STRP ''gene'' conversion without recombination was calculated as 3 X 10(-4)/meiosis. For distances up to 30 cM between recombinations, many fewer chromosomes which had undergone exactly two recombinations were observed than were expected on the basis of the assumption of independent recombination locations. This strong new evidence for human meiotic interference will help to improve the accuracy of interpretation of clinical DNA test results involving polymorphisms flanking a genetic abnormality. C1 LOUISIANA STATE UNIV,MED CTR,DEPT BIOMETRY & GENET,NEW ORLEANS,LA 70112. MIT,CTR GENOME RES,DEPT BIOL,CAMBRIDGE,MA 02139. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. RP WEBER, JL (reprint author), MARSHFIELD MED RES FDN,CTR MED GENET,1000 N OAK AVE,MARSHFIELD,WI 54449, USA. FU NHGRI NIH HHS [HG00395, HG00248, HG00835] NR 60 TC 90 Z9 93 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD NOV PY 1993 VL 53 IS 5 BP 1079 EP 1095 PG 17 WC Genetics & Heredity SC Genetics & Heredity GA MC333 UT WOS:A1993MC33300012 PM 8213834 ER PT J AU WESTRICH, HR CYGAN, RT CASEY, WH ZEMITIS, C ARNOLD, GW AF WESTRICH, HR CYGAN, RT CASEY, WH ZEMITIS, C ARNOLD, GW TI THE DISSOLUTION KINETICS OF MIXED-CATION ORTHOSILICATE MINERALS SO AMERICAN JOURNAL OF SCIENCE LA English DT Article ID PH = 2; COORDINATION CHEMISTRY; SURFACE-CHEMISTRY; LABRADORITE FELDSPAR; SOLUTION INTERFACE; AQUEOUS-SOLUTIONS; RATES; MECHANISM; OLIVINE; OXIDE AB Proton-promoted dissolution rates of orthosilicate minerals of the olivine and willemite structural classes were examined as a function of composition, pH, and temperature. The dissolution rates far from equilibrium vary by many orders of magnitude but exhibit a similar dependence on pH and temperature. The dissolution rates correlate well with the rates of solvent exchange around the corresponding hydrated, divalent cation. This correlation suggests that the silicate tetrahedra are released intact from the reacting surfaces after protonation and hydration of bonds between divalent metals and structural oxygens. Surprisingly, the correlation remains sound even for minerals with dissimilar divalent cations in the structure. Rates for intermediate compounds in a binary series vary approximately exponentially between the dissolution rates for the endmembers, which greatly simplifies prediction of the reactivities. The similar variation in Arrhenius activation energies with pH for all minerals suggests that the experimental activation energies include large contributions of enthalpy from equilibrium acid-base reactions. The acid-base properties are not particularly sensitive to homovalent substitutions df cations in the mineral structure, even though such substitutions dramatically affect the mineral reactivity and mineral lattice energies. C1 UNIV CALIF DAVIS, DEPT GEOL, DAVIS, CA 95616 USA. SANDIA NATL LABS, DEPT ION SOLIDS INTERACT, ALBUQUERQUE, NM 87185 USA. RP WESTRICH, HR (reprint author), SANDIA NATL LABS, DEPT GEOCHEM, ALBUQUERQUE, NM 87185 USA. NR 51 TC 71 Z9 71 U1 3 U2 15 PU AMER JOURNAL SCIENCE PI NEW HAVEN PA YALE UNIV, PO BOX 208109, NEW HAVEN, CT 06520-8109 USA SN 0002-9599 EI 1945-452X J9 AM J SCI JI Am. J. Sci. PD NOV PY 1993 VL 293 IS 9 BP 869 EP 893 PG 25 WC Geosciences, Multidisciplinary SC Geology GA MG727 UT WOS:A1993MG72700001 ER PT J AU SHUM, SCK HOUK, RS AF SHUM, SCK HOUK, RS TI ELEMENTAL SPECIATION BY ANION-EXCHANGE AND SIZE-EXCLUSION CHROMATOGRAPHY WITH DETECTION BY INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY WITH DIRECT-INJECTION NEBULIZATION SO ANALYTICAL CHEMISTRY LA English DT Article ID PERFORMANCE LIQUID-CHROMATOGRAPHY; RARE-EARTH ELEMENTS; ION CHROMATOGRAPHY; ARSENIC SPECIATION; TRACE-ELEMENTS; LEAD; METALS; IDENTIFICATION; METABOLITES; SEPARATION AB A direct injection nebulizer (DIN) is used with packed microcolumns for anion chromatography (AC) and size exclusion chromatography (SEC). Two Se species (SeO32- and SeO42-) are separated by AC with detection limits of 15 pg of Se. The isotope ratio Se-74/Se-78 can be measured with a relative standard deviation of 0.5 % on 25 ng of each Se species during the actual chromatographic separation. Proteins in human serum are separated by SEC without sample pretreatment. The metals present in each molecular weight fraction are determined by ICP-MS with detection limits of 0.5-3 pg of metal. These absolute detection limits are 1-2 orders of magnitude better than those obtained with conventional nebulizers. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,US DOE,AMES LAB,AMES,IA 50011. NR 56 TC 113 Z9 115 U1 2 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 1 PY 1993 VL 65 IS 21 BP 2972 EP 2976 DI 10.1021/ac00069a006 PG 5 WC Chemistry, Analytical SC Chemistry GA ME469 UT WOS:A1993ME46900007 ER PT J AU DAVIES, JP BLACKWOOD, LG DAVIS, SG GOODRICH, LD LARSON, RA AF DAVIES, JP BLACKWOOD, LG DAVIS, SG GOODRICH, LD LARSON, RA TI DESIGN AND CALIBRATION OF PULSED VAPOR GENERATORS FOR 2,4,6-TRINITROTOLUENE, CYCLO-1,3,5-TRIMETHYLENE-2,4,6-TRINITRAMINE, AND PENTAERYTHRITIOL TETRANITRATE SO ANALYTICAL CHEMISTRY LA English DT Article AB Computer-controlled pulsed explosive vapor generators for 2,4,6-trinitrotoluene (TNT), cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX), and pentaerythritol (PETN) were built and calibrated to support an independent validation and verification facility for explosive detection systems for the Federal Aviation Administration at the Idaho National Engineering Laboratory. The explosive vapor generators will be used as quantitative vapor standards to establish the lower limits of detection of explosive detection systems. The generators were constructed using pure explosive suspended on quartz beads which were then loaded into a stainless steel tube. The tube was coiled and placed into a temperature-controlled chamber. A carrier gas (ultrapure air) was passed through the coil to carry the explosive molecules. The generators are capable of delivering a pulse of varying explosive mass through the control of coil temperature, airflow rate, and pulse width. Preliminary calibrations have been completed in the picogram to nanogram range using an ion mobility spectrometer as the calibrating instrument. RP DAVIES, JP (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 8 TC 28 Z9 28 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 1 PY 1993 VL 65 IS 21 BP 3004 EP 3009 DI 10.1021/ac00069a012 PG 6 WC Chemistry, Analytical SC Chemistry GA ME469 UT WOS:A1993ME46900013 ER PT J AU DSILVA, AP BAJIC, SJ ZAMZOW, D AF DSILVA, AP BAJIC, SJ ZAMZOW, D TI REMOTE ACID GAS-PHASE DISSOLUTION FOR THE DETERMINATION OF URANIUM IN SOIL MATRICES SO ANALYTICAL CHEMISTRY LA English DT Note RP DSILVA, AP (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 3 TC 3 Z9 4 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 1 PY 1993 VL 65 IS 21 BP 3174 EP 3175 DI 10.1021/ac00069a039 PG 2 WC Chemistry, Analytical SC Chemistry GA ME469 UT WOS:A1993ME46900040 ER PT J AU GRATE, JW MARTIN, SJ WHITE, RM AF GRATE, JW MARTIN, SJ WHITE, RM TI ACOUSTIC-WAVE MICROSENSORS .1. SO ANALYTICAL CHEMISTRY LA English DT Article ID QUARTZ-CRYSTAL MICROBALANCE; THICKNESS-SHEAR-MODE; LIQUID-PHASE; GRAVIMETRIC SENSORS; CHEMICAL-ANALYSIS; VAPOR SENSORS; DEVICES; MASS; DESIGN; MICROINSTRUMENTATION C1 SANDIA NATL LABS, DEPT MICROSENSOR RES & DEV, ALBUQUERQUE, NM 87185 USA. UNIV CALIF BERKELEY, DEPT ELECT ENGN & COMP SCI, BERKELEY SENSOR & ACTUATOR CTR, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, ELECTR RES LAB, BERKELEY, CA 94720 USA. RP GRATE, JW (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, BATTELLE BLVD, RICHLAND, WA 99352 USA. NR 65 TC 151 Z9 153 U1 2 U2 11 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 NOV 1 PY 1993 VL 65 IS 21 BP A940 EP A948 DI 10.1021/ac00069a002 PG 9 WC Chemistry, Analytical SC Chemistry GA ME469 UT WOS:A1993ME46900003 ER PT J AU CHEN, J CHRISTIANSEN, J CAMPOBASSO, N BOLIN, JT TITTSWORTH, BC HALES, BJ REHR, JJ CRAMER, SP AF CHEN, J CHRISTIANSEN, J CAMPOBASSO, N BOLIN, JT TITTSWORTH, BC HALES, BJ REHR, JJ CRAMER, SP TI REFINEMENT OF A MODEL FOR THE NITROGENASE MO-FE CLUSTER USING SINGLE-CRYSTAL MO AND FE EXAFS SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID RAY ABSORPTION-SPECTROSCOPY; IRON-MOLYBDENUM COFACTOR; SITE C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. PURDUE UNIV,DEPT BIOL,W LAFAYETTE,IN 47907. LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. NR 22 TC 36 Z9 36 U1 0 U2 1 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 NOV PY 1993 VL 32 IS 11 BP 1592 EP 1594 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA MK230 UT WOS:A1993MK23000009 ER PT J AU ABDALLA, MA PEREZ, RB AF ABDALLA, MA PEREZ, RB TI A LAGRANGIAN-BASED NONLINEAR CLOSED-LOOP CONTROL ALGORITHM - APPLICATION TO THE ADVANCED LIQUID-METAL REACTOR SO ANNALS OF NUCLEAR ENERGY LA English DT Article AB A closed-loop nonlinear control algorithm for the on-line control of nuclear power plants is presented. The algorithm is based on the Lagrangian version of Pontryagin's maximum principle (PMP). The two-point boundary value problem associated with the PMP formalism has been converted into an initial value problem. This conversion, valid only when a demand is prescribed, allows the on-line operation of the control algorithm. The current Lagrangian-based control algorithm can perform on-line load following, plant state estimation and treat unmeasurable plant parameters as uncertain parts in the controller model. The control algorithm has been proven to be stable in the small, robust against large perturbations and, once tuned, can handle a wide range of transients. The usefulness of the new control algorithm has been demonstrated by the development of a set of real-time advanced controllers for the multimodular advanced liquid metal reactor. C1 OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831. RP ABDALLA, MA (reprint author), OAK RIDGE ASSOCIATED UNIV,POB 117,OAK RIDGE,TN 37831, USA. NR 14 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD NOV PY 1993 VL 20 IS 11 BP 721 EP 732 DI 10.1016/0306-4549(93)90093-5 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MA973 UT WOS:A1993MA97300001 ER PT J AU BOOTH, TE BURN, KW AF BOOTH, TE BURN, KW TI SOME SAMPLE PROBLEM COMPARISONS BETWEEN THE DSA CELL MODEL AND THE QUASI-DETERMINISTIC METHOD SO ANNALS OF NUCLEAR ENERGY LA English DT Article AB Variance reduction methods have become increasingly more automated with respect to the selection of parameters required by the methods. Each automatic or semi-automatic procedure is typically published showing the variance reduction achieved by the procedure on a different set of test problems from every other procedure. This makes it extremely difficult to understand the relative strengths and weaknesses of the different procedures. This paper compares the DSA cell model and the quasi-deterministic methods (implemented in modified versions of MCNP) for obtaining splitting and Russian Roulette parameters on the same test problems. C1 ENEA,DIPARTIMENTO REATTORI INNOVATIVI,I-40129 BOLOGNA,ITALY. RP BOOTH, TE (reprint author), LOS ALAMOS NATL LAB,MS B226,LOS ALAMOS,NM 87545, USA. NR 9 TC 6 Z9 6 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD NOV PY 1993 VL 20 IS 11 BP 733 EP 765 DI 10.1016/0306-4549(93)90094-6 PG 33 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MA973 UT WOS:A1993MA97300002 ER PT J AU ARRAGE, AA PHELPS, TJ BENOIT, RE WHITE, DC AF ARRAGE, AA PHELPS, TJ BENOIT, RE WHITE, DC TI SURVIVAL OF SUBSURFACE MICROORGANISMS EXPOSED TO UV-RADIATION AND HYDROGEN-PEROXIDE SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID ESCHERICHIA-COLI; BACTERIA; SUSCEPTIBILITY; MICROBIOLOGY; MUTAGENESIS; SEDIMENTS; AQUIFERS; REPAIR AB Aerobic and microaerophilic subsurface bacteria were screened for resistance to UV light. Contrary to the hypothesis that subsurface bacteria should be sensitive to UV light, the organisms studied exhibited resistance levels as efficient as those of surface bacteria. A total of 31% of the aerobic subsurface isolates were UV resistant, compared with 26% of the surface soil bacteria that were tested. Several aerobic, gram-positive, pigmented, subsurface isolates exhibited greater resistance to UV light than all of the reference bacterial strains tested except Deinococcus radiodurans. None of the microaerophilic, gram-negative, nonpigmented, subsurface isolates were UV resistant; however, these isolates exhibited levels of sensitivity similar to those of the gram-negative reference bacteria Escherichia coli B and Pseudomonas fluorescens. Photoreactivation activity was detected in three subsurface isolates, and strain UV3 exhibited a more efficient mechanism than E. coli B. The peroxide resistance of four subsurface isolates was also examined. The aerobic subsurface bacteria resistant to UV light tolerated higher levels of H2O2 than the microaerophilic organisms. The conservation of DNA repair pathways in subsurface-microorganisms may be important in maintaining DNA integrity and in protecting the organisms against chemical insults, such as oxygen radicals, during periods of slow growth. C1 UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,10515 RES DR,KNOXVILLE,TN 37932. VIRGINIA POLYTECH INST & STATE UNIV,DEPT BIOL,BLACKSBURG,VA 24061. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI phelps, tommy/A-5244-2011 NR 35 TC 51 Z9 54 U1 1 U2 7 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 NOV PY 1993 VL 59 IS 11 BP 3545 EP 3550 PG 6 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA ME660 UT WOS:A1993ME66000004 PM 8285661 ER PT J AU MATTHEIJ, RMM WRIGHT, SJ AF MATTHEIJ, RMM WRIGHT, SJ TI PARALLEL STABLE COMPACTIFICATION FOR ODES WITH PARAMETERS AND MULTIPOINT CONDITIONS SO APPLIED NUMERICAL MATHEMATICS LA English DT Article ID BOUNDARY-VALUE-PROBLEMS AB Many algorithms for solving ordinary differential equations with parameters and multipoint side conditions give rise to systems of linear algebraic equations in which the coefficient matrices have a bordered block diagonal structure. In this paper, we show how these problems can be solved by using parallel algorithms based on stabilized compactification. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. RP MATTHEIJ, RMM (reprint author), EINDHOVEN UNIV TECHNOL,DEPT MATH & COMP SCI,POB 513,5600 MB EINDHOVEN,NETHERLANDS. NR 13 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 J9 APPL NUMER MATH JI Appl. Numer. Math. PD NOV PY 1993 VL 13 IS 4 BP 305 EP 333 DI 10.1016/0168-9274(93)90004-B PG 29 WC Mathematics, Applied SC Mathematics GA MJ508 UT WOS:A1993MJ50800004 ER PT J AU PENNYCOOK, SJ BROWNING, ND JESSON, DE CHISHOLM, MF MCGIBBON, AJ AF PENNYCOOK, SJ BROWNING, ND JESSON, DE CHISHOLM, MF MCGIBBON, AJ TI ATOMIC-RESOLUTION IMAGING AND SPECTROSCOPY OF SEMICONDUCTOR INTERFACES SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID TRANSMISSION ELECTRON-MICROSCOPY; CONTRAST; CRYSTALS; STEM AB Incoherent Z-contrast imaging uses a high-angle annular detector to collect only highly local, incoherently generated scattering with the result that images become dependent on intensities, not phases. No model structures are required for a first-order structure determination, and the images remain intuitively interpretable even at interfaces. Under suitable conditions, incoherently generated inelastic scattering may be collected simultaneously with a large-aperture axial spectrometer, and, by using the Z-contrast image to locate the scanning transmission electron microscope (STEM) probe over selected atomic columns, can provide an atomic-resolution chemical analysis. This is demonstrated with reference to an epitaxial CoSi2/Si(100) interface, achieving a 2.7 angstrom spatial resolution. Recent insights into the growth and relaxation of strained Si-Ge epitaxial films are described, highlighting the role of stress concentrations, and contrasting the case of a free surface with that of a surface constrained by an oxide layer. RP PENNYCOOK, SJ (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. OI Browning, Nigel/0000-0003-0491-251X; Jesson, David/0000-0003-0897-1445 NR 32 TC 9 Z9 9 U1 0 U2 7 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 NOV PY 1993 VL 57 IS 5 BP 385 EP 391 DI 10.1007/BF00331776 PG 7 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MJ853 UT WOS:A1993MJ85300003 ER PT J AU NILSEN, J MORENO, JC MACGOWAN, BJ KOCH, JA AF NILSEN, J MORENO, JC MACGOWAN, BJ KOCH, JA TI 1ST OBSERVATION OF LASING AT 231-ANGSTROM IN NEON-LIKE NICKEL USING THE PREPULSE TECHNIQUE SO APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY LA English DT Article ID X-RAY LASER; FOIL AB We report lasing for the first time in nickel on the neon-like J = 0 --> 1, 3p --> 3s transition at 231 angstrom as well as several weaker transitions including the J = 2 --> 1 lines at 298 angstrom and 304 angstrom. Amplification is seen only when the prepulse technique of using a low intensity prepulse before the main optical drive pulse is used to illuminate the nickel target. The prepulse technique is also shown to produce lasing in copper and dramatically improve the output of the germanium laser. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP NILSEN, J (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 9 TC 58 Z9 58 U1 0 U2 3 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0721-7269 J9 APPL PHYS B-PHOTO PD NOV PY 1993 VL 57 IS 5 BP 309 EP 311 DI 10.1007/BF00332454 PG 3 WC Physics, Applied SC Physics GA MJ854 UT WOS:A1993MJ85400003 ER PT J AU LOBODA, PA LYKOV, VA POLITOV, VY NILSEN, J AF LOBODA, PA LYKOV, VA POLITOV, VY NILSEN, J TI TI-PUMPED MO X-RAY LASER AT 24-ANGSTROM SO APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY LA English DT Article ID POPULATION-INVERSION; RESONANT PHOTOEXCITATION; IONS; RADIATION; PLASMAS; GAIN AB We propose using the Ti XXI He-alpha emission line to resonantly photo-pump Li-like Mo (Z=42) and produce lasing on several n = 5 --> n = 4 transitions near 24 angstrom. The continuum emission from Ti photoionizes the Mo to the Li-like isoelectronic sequence. Gains of 1-2 cm-1 are calculated on these lines before the inclusion of Stark broadening which lowers the gain by as much as a factor of two. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LOBODA, PA (reprint author), NATL INST TECH PHYS,POB 245,CHELYABINSK 454070,RUSSIA. NR 28 TC 5 Z9 5 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0721-7269 J9 APPL PHYS B-PHOTO PD NOV PY 1993 VL 57 IS 5 BP 325 EP 329 DI 10.1007/BF00332457 PG 5 WC Physics, Applied SC Physics GA MJ854 UT WOS:A1993MJ85400006 ER PT J AU HOHIMER, JP VAWTER, GA AF HOHIMER, JP VAWTER, GA TI UNIDIRECTIONAL SEMICONDUCTOR RING LASERS WITH RACETRACK CAVITIES SO APPLIED PHYSICS LETTERS LA English DT Article AB We report the development of racetrack-cavity semiconductor ring lasers that operate unidirectionally by means of an active crossover waveguide. These racetrack-cavity lasers show improved performance over previous circular-cavity unidirectional ring lasers with continuous-wave single-frequency output powers of greater-than-or-equal-to 10 mW, and with up to 99% of the lasing output emitted from the preferred ring direction. RP HOHIMER, JP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 29 Z9 31 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 NOV 1 PY 1993 VL 63 IS 18 BP 2457 EP 2459 DI 10.1063/1.110474 PG 3 WC Physics, Applied SC Physics GA MD960 UT WOS:A1993MD96000002 ER PT J AU ZOLLNER, S AF ZOLLNER, S TI MODEL DIELECTRIC FUNCTIONS FOR NATIVE OXIDES ON COMPOUND SEMICONDUCTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID GROWN ANODIC OXIDE; OPTICAL-PROPERTIES; SPECTROSCOPIC ELLIPSOMETRY; GAAS; INSB; GASB; INAS; GAP; INP AB Analytical models with eight parameters have been found which describe the dielectric functions of native or electrochemically grown oxide layers on the compound semiconductors GaP, GaAs, GaSb, InP, InAs, and InSb in the 1.6 to 5.6 eV photon energy range. These model functions agree with the experimental optical constants to within the accuracy of the measurements. They will be useful for the design and analysis of semiconductor laser structures, solar cells, and other electro-optical devices. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZOLLNER, S (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Zollner, Stefan/B-4858-2012 OI Zollner, Stefan/0000-0001-7752-7941 NR 16 TC 92 Z9 93 U1 1 U2 6 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 NOV 1 PY 1993 VL 63 IS 18 BP 2523 EP 2524 DI 10.1063/1.110469 PG 2 WC Physics, Applied SC Physics GA MD960 UT WOS:A1993MD96000024 ER PT J AU WEI, SH ZUNGER, A AF WEI, SH ZUNGER, A TI BAND OFFSETS AT THE CDS/CUINSE2 HETEROJUNCTION SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; SOLAR-CELL; CUINSE2; CUGASE2 AB The traditional explanation for the successful electron-hole separation in CdS/CuInSe2 solar cells rests on the assumption of a type-II band lineup: The conduction-band minimum is assumed to be on the CdS window while the valence-band maximum is assumed to be localized on the CuInSe2 absorber. This picture of negative conduction-band offset DELTAE(c) < 0 was supported by the electron affinity rule, but was sharply contradicted by the more recent photoemission experiments of Nelson et al. for CdS/CuInSe2 yielding DELTAE(c) = +1.08 eV. Our first principles calculations yield for CdS/CuInSe2 DELTAE(c) = +0.31 eV, hence, a type-I band alignment. We challenge the published experimental value as being in error and point to the need of revising current solar cell device models that assume DELTAE(c) < 0. RP WEI, SH (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 18 TC 60 Z9 60 U1 1 U2 18 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 NOV 1 PY 1993 VL 63 IS 18 BP 2549 EP 2551 DI 10.1063/1.110429 PG 3 WC Physics, Applied SC Physics GA MD960 UT WOS:A1993MD96000033 ER PT J AU WEISS, S OGLETREE, DF BOTKIN, D SALMERON, M CHEMLA, DS AF WEISS, S OGLETREE, DF BOTKIN, D SALMERON, M CHEMLA, DS TI ULTRAFAST SCANNING PROBE MICROSCOPY SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSMISSION-LINES AB We have measured the response of the tunneling gap of a scanning tunneling microscope to excitation by a subpicosecond electrical pulse. Combining ultrashort laser pulses techniques with scanning tunneling microscopy (STM), we have obtained simultaneous 2-ps time resolution and 50-angstrom spatial resolution. This is a 9 orders of magnitude improvement in the time resolution currently attainable with STM. The potential of this powerful technique for studying ultrafast dynamical phenomena on surfaces with atomic resolution and mesoscopic electronic device physics is discussed. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP WEISS, S (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,MS 2-300,BERKELEY,CA 94720, USA. RI weiss, shimon/B-4164-2009; Ogletree, D Frank/D-9833-2016 OI weiss, shimon/0000-0002-0720-5426; Ogletree, D Frank/0000-0002-8159-0182 NR 12 TC 85 Z9 86 U1 1 U2 21 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 NOV 1 PY 1993 VL 63 IS 18 BP 2567 EP 2569 DI 10.1063/1.110435 PG 3 WC Physics, Applied SC Physics GA MD960 UT WOS:A1993MD96000039 ER PT J AU WEBB, JD DUNLAVY, DJ CISZEK, T AHRENKIEL, RK WANLASS, MW NOUFI, R VERNON, SM AF WEBB, JD DUNLAVY, DJ CISZEK, T AHRENKIEL, RK WANLASS, MW NOUFI, R VERNON, SM TI ROOM-TEMPERATURE MEASUREMENT OF PHOTOLUMINESCENCE SPECTRA OF SEMICONDUCTORS USING AN FT-RAMAN SPECTROPHOTOMETER SO APPLIED SPECTROSCOPY LA English DT Article DE FT-IR PL SPECTROSCOPY; FT-RAMAN SPECTROSCOPY; PHOTOVOLTAIC MATERIALS; ELECTROOPTIC MATERIALS; SILICON; GALLIUM INDIUM ARSENIDE PHOSPHIDE; COPPER INDIUM DISELENIDE; GALLIUM-ARSENIDE GERMANIUM-ALLOY ID LIFETIME; SILICON AB This paper demonstrates the utility of an FT-Raman accessory for an FT-IR spectrophotometer in obtaining the room-temperature photoluminescence (PL) spectra of semiconductors used in photovoltaic and electro-optical devices. Sample types analyzed by FT-IR/PL spectroscopy included bulk silicon and films of gallium indium arsenide phosphide (GaInAsP), copper indium diselenide (CuInSe2), and gallium arsenide-germanium alloy on various substrates. The FT-IR/PL technique exhibits advantages in speed, sensitivity, and freedom from stray light over conventional dispersive methods, and can be used in some cases to characterize complete semiconductor devices as well as component materials at room temperature. Some suggestions for improving the spectral range of the technique and removing instrumental spectral artifacts are presented. C1 SPIRE CORP,BEDFORD,MA 01730. RP WEBB, JD (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 23 TC 4 Z9 4 U1 0 U2 6 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD NOV PY 1993 VL 47 IS 11 BP 1814 EP 1819 DI 10.1366/0003702934066019 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA MH157 UT WOS:A1993MH15700018 ER PT J AU STUMP, NA CHEN, G HAIRE, RG PETERSON, JR AF STUMP, NA CHEN, G HAIRE, RG PETERSON, JR TI LANTHANIDE LUMINESCENCE SPECTROSCOPY AS A MONITOR OF CRYSTAL-STRUCTURE SO APPLIED SPECTROSCOPY LA English DT Note DE EU3+ ION LUMINESCENCE; OPTICAL PROBE OF STRUCTURE; LANTHANIDE SESQUIOXIDES ID PRESSURE C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. NR 9 TC 4 Z9 4 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 NOV PY 1993 VL 47 IS 11 BP 1951 EP 1952 DI 10.1366/0003702934065902 PG 2 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA MH157 UT WOS:A1993MH15700036 ER PT J AU KINNEY, JH BALOOCH, M MARSHALL, GW MARSHALL, SJ AF KINNEY, JH BALOOCH, M MARSHALL, GW MARSHALL, SJ TI ATOMIC-FORCE MICROSCOPIC STUDY OF DIMENSIONAL CHANGES IN HUMAN DENTIN DURING DRYING SO ARCHIVES OF ORAL BIOLOGY LA English DT Article DE DENTIN; DRYING; SHRINKAGE; ATOMIC FORCE MICROSCOPY AB Six 1-mm thick sections of human dentine, three parallel to the occlusal surface and three perpendicular to the buccal surface, were prepared from non-carious third molars. The enamel was ground off, and the sections were polished with alumina powder to remove the smear layer. Each section was imaged by atomic-force microscopy with 20 nm horizontal and 0.1 nm vertical resolutions, initially while the samples were immersed in deionized water and then periodically during drying at room temperature. No dimensional changes over microscopic fields of view (scanned areas smaller than 50 x 50 mum) could be detected within the precision of the measurements (< 0.5%). Across the entire sample, however, vertical displacements of 10-20 mum were measured. Elasticity (Bernoulli beam) theory was used to calculate the engineering strain required to produce these displacements. The magnitude of the strain was 0.04% (SD = 0.01) in the buccal sections in the direction of the tubule axis and 0.09% (SD = 0.02) in the direction normal to the tubule axis. Also, the strain alternated between tension and compression across the samples. It was concluded that, as determined by using microscopic techniques, drying-induced strain is too small to require corrections for tubule size and tubule density. C1 UNIV CALIF SAN FRANCISCO,DEPT RESTORAT DENT,SAN FRANCISCO,CA 94143. RP KINNEY, JH (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551, USA. FU NIDCR NIH HHS [P01 DE09859] NR 9 TC 40 Z9 41 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0003-9969 J9 ARCH ORAL BIOL JI Arch. Oral Biol. PD NOV PY 1993 VL 38 IS 11 BP 1003 EP 1007 DI 10.1016/0003-9969(93)90114-2 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA ML097 UT WOS:A1993ML09700011 PM 8297253 ER PT J AU WILLIAMS, PT VRANIZAN, KM AUSTIN, MA KRAUSS, RM AF WILLIAMS, PT VRANIZAN, KM AUSTIN, MA KRAUSS, RM TI ASSOCIATIONS OF AGE, ADIPOSITY, ALCOHOL INTAKE, MENSTRUAL STATUS, AND ESTROGEN THERAPY WITH HIGH-DENSITY-LIPOPROTEIN SUBCLASSES SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE GRADIENT GEL ELECTROPHORESIS; HDL; AGE; MENOPAUSE; MENSTRUAL; PUBERTY; ALCOHOL; ADIPOSITY; HDL(2); HDL(3); APOLIPOPROTEIN-A-I; ESTROGEN ID APOLIPOPROTEIN-A-I; GRADIENT GEL-ELECTROPHORESIS; PARTICLE-SIZE DISTRIBUTION; SERUM-LIPOPROTEINS; SUBFRACTIONS; WOMEN; MEN; PRECIPITATION; QUANTITATION; POPULATION AB We used nondenaturing polyacrylamide gradient gel electrophoresis to examine the associations of age, adiposity, alcohol intake, and exogenous estrogen with high-density lipoprotein (HDL) subclasses in 427 members of 51 principally Mormon kindreds. The absorbency of protein stain was used as an index of mass concentrations at intervals of 0.01 nm within five HDL subclasses: HDL3c (7.2 to 7.8 nm), HDL3b (7.8 to 8.2 nm), HDL3a (8.2 to 8.8 nm), HDL2a (8.8 to 9.7 nm), and HDL2b (9.7 to 12 nm). Age and alcohol intake were obtained from questionnaires, and body mass index was computed from clinic measurements as weight (kg)/height (m)2. The results suggest that HDL3b concentrations were higher after menopause than before. Adult men (greater-than-or-equal-to 18 years old) had significantly higher HDL3c and HDL3b and significantly lower HDL2b and HDL2a levels than younger boys. Compared with the women, adult men had higher levels of HDL3c and HDL3b and lower levels of HDL2b, HDL2a, and larger-diameter HDL3a particles. There were no significant differences between the HDL profiles of women and younger boys, suggesting that the divergence in HDL occurs during puberty. Eighty-eight percent of the increase in HDL associated with estrogen replacement in postmenopausal women occurred within HDL3a and HDL2a. Reported alcohol intake in adult men correlated with two HDL regions: one within the HDL2b region and a second within the HDL3a/2a region, whereas in women the positive correlation between alcohol and HDL levels was within the HDL2b region only. In both men and premenopausal adult women, increasing levels of body mass index were associated with higher levels of HDL3b and lower levels of HDL2b. Statistical adjustment for HDL cholesterol levels eliminated the significant relations of alcohol with HDL subclasses in both men and women. The adjustment did not eliminate the significant relations of age and body mass index to HDL3c and HDL3b. Thus, gradient gel electrophoresis of HDL subclasses appears to identify important physiological relations that are independent of HDL cholesterol levels. C1 UNIV WASHINGTON,SCH PUBL HLTH & COMMUNITY MED,DEPT EPIDEMIOL,SEATTLE,WA 98195. RP WILLIAMS, PT (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 934,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL-02183, HL-18574, HL-24462] NR 32 TC 44 Z9 44 U1 1 U2 2 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD NOV PY 1993 VL 13 IS 11 BP 1654 EP 1661 PG 8 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MF625 UT WOS:A1993MF62500015 PM 8218107 ER PT J AU SCHLIESING, JS ONEILL, PJ HALVERSON, MA BRAMBLEY, MR AF SCHLIESING, JS ONEILL, PJ HALVERSON, MA BRAMBLEY, MR TI BUILDING OPERATION - OPPORTUNITIES FOR IMPROVEMENT SO ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS LA English DT Article RP SCHLIESING, JS (reprint author), PACIFIC NW LAB, DEPT ENERGY SCI, RICHLAND, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC HEAT REFRIG AIR- CONDITIONING ENG INC PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 SN 0001-2491 J9 ASHRAE J JI ASHRAE J.-Am. Soc. Heat Refrig. Air-Cond. Eng. PD NOV PY 1993 VL 35 IS 11 BP 38 EP 43 PG 6 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA MG752 UT WOS:A1993MG75200003 ER PT J AU STROHMAYER, TE AF STROHMAYER, TE TI DENSITY DISCONTINUITIES AND THE G-MODE OSCILLATION SPECTRA OF NEUTRON-STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, NEUTRON; STARS, OSCILLATIONS AB Density discontinuities resulting from sudden composition variations, as we as smooth variations in entropy, both provide sources of buoyancy which together determine the global g-mode oscillation spectra of neutron stars. Previous calculations by Finn and McDermott investigated the g-modes induced by density discontinuities at zero temperature. That is, they neglected the contributions to buoyancy due to smooth variations in entropy at finite temperature. They also investigated only purely fluid models. We have extended these previous calculations by computing the quadrupole, spheroidal oscillation spectra, both with and without a single density discontinuity of two finite-temperature, three-component (core, crust, ocean) neutron star models. We have inserted in each model a single density discontinuity associated with the Fe-56 to Ni-62 transition predicted by the BPS equation of state (Baym, Pethick, & Sutherland). For one model this discontinuity occurs in the solid crust of the star, while for the other, hotter (younger) model it resides in the fluid ocean overlying the crust. When the discontinuity resides in the solid crust we find no significant differences between the low-order, spheroidal oscillation spectra computed with and without the discontinuity. However, when the discontinuity lies in the fluid ocean the surface g-mode spectrum is substantially altered. In particular, for a 5% density jump, the period of the fundamental surface g-mode of this model drops from about 50 ms to 37 ms. The periods of the higher overtones are also perturbed away from their values without a discontinuity. RP STROHMAYER, TE (reprint author), LOS ALAMOS NATL LAB,MS D436,LOS ALAMOS,NM 87545, USA. NR 18 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1993 VL 417 IS 1 BP 273 EP 278 DI 10.1086/173309 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MD103 UT WOS:A1993MD10300024 ER PT J AU HANSEN, ADA KAPUSTIN, VN KOPEIKIN, VM GILLETTE, DA BODHAINE, BA AF HANSEN, ADA KAPUSTIN, VN KOPEIKIN, VM GILLETTE, DA BODHAINE, BA TI OPTICAL-ABSORPTION BY AEROSOL BLACK CARBON AND DUST IN A DESERT REGION OF CENTRAL-ASIA SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article ID PARTICLES AB In September 1989 a joint U.S.S.R.-U.S. study of the causes and effects of desert dust on the environment was conducted in the Tadzhik S.S.R. in Soviet Central Asia. The objectives of the study included measurements of optical absorption by suspended material, both windblown dust and aerosol ''black'' carbon. This latter material is a combustion effluent, prevalent in emissions from poorly controlled burning, with a long atmospheric lifetime and a large cross-section for the absorption of visible radiation. The measurements obtained from the analysis of filter samples indicate that only during periods of active dust production was there a significant contribution of dust to total absorption. At other times, the presence of black carbon from local and regional sources accounted for approximately 90 degrees of the total aerosol optical absorption. The conclusions are that fuel combustion may produce a greater optical impact on the atmosphere in less-developed areas of the world than that arising from the effects of desert dust production. C1 RUSSIAN ACAD SCI,INST ATMOSPHER PHYS,MOSCOW,RUSSIA. NOAA,ARL,RE ARX1,BOULDER,CO. NOAA,CDML,GMCC,RE CG1,BOULDER,CO. RP HANSEN, ADA (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 13 TC 37 Z9 44 U1 3 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD NOV PY 1993 VL 27 IS 16 BP 2527 EP 2531 DI 10.1016/0960-1686(93)90025-T PG 5 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA MJ816 UT WOS:A1993MJ81600009 ER PT J AU JANEV, RK PHANEUF, RA TAWARA, H SHIRAI, T AF JANEV, RK PHANEUF, RA TAWARA, H SHIRAI, T TI RECOMMENDED CROSS-SECTIONS FOR STATE-SELECTIVE ELECTRON-CAPTURE IN COLLISIONS OF C6+ AND O8+ IONS WITH ATOMIC-HYDROGEN SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID PERTURBED STATIONARY STATES; SLOW; H-2 C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. NATL INST FUS SCI,NAGOYA 46401,JAPAN. JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI,JAPAN. RP JANEV, RK (reprint author), INT ATOM ENERGY AGCY,POB 100,A-1400 VIENNA,AUSTRIA. NR 24 TC 17 Z9 17 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 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD NOV PY 1993 VL 55 IS 2 BP 201 EP 232 DI 10.1006/adnd.1993.1021 PG 32 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA MR225 UT WOS:A1993MR22500001 ER PT J AU HENKE, BL GULLIKSON, EM DAVIS, JC AF HENKE, BL GULLIKSON, EM DAVIS, JC TI X-RAY INTERACTIONS - PHOTOABSORPTION, SCATTERING, TRANSMISSION AND REFLECTION AT E=50-30,000 EV, Z=1-92 (VOL 54, PG 181, 1993) SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Correction, Addition C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. NR 1 TC 24 Z9 24 U1 3 U2 45 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 NOV PY 1993 VL 55 IS 2 BP 349 EP 349 PG 1 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA MR225 UT WOS:A1993MR22500005 ER PT J AU GOLDSTEIN, AH ROGERS, RD MEAD, G AF GOLDSTEIN, AH ROGERS, RD MEAD, G TI MINING BY MICROBE SO BIO-TECHNOLOGY LA English DT Article ID PYRROLOQUINOLINE QUINONE; GLUCOSE-DEHYDROGENASE; NUCLEOTIDE-SEQUENCE; ERWINIA-HERBICOLA; SOLUBILIZATION; ACINETOBACTER; BIOSYNTHESIS; CLONING; GENE C1 IDAHO NATL ENGN LAB, IDAHO FALLS, ID 83415 USA. JR SIMPLOT INC, POCATELLO, ID 83204 USA. RP GOLDSTEIN, AH (reprint author), CALIF STATE UNIV LOS ANGELES, DEPT BIOL, LOS ANGELES, CA 90032 USA. NR 17 TC 63 Z9 72 U1 0 U2 4 PU NATURE PUBLISHING GROUP PI NEW YORK PA 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA SN 0733-222X J9 BIO-TECHNOL JI Bio-Technology PD NOV PY 1993 VL 11 IS 11 BP 1250 EP 1254 PG 5 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA MF872 UT WOS:A1993MF87200022 ER PT J AU LOSCHE, M PIEPENSTOCK, M DIEDERICH, A GRUNEWALD, T KJAER, K VAKNIN, D AF LOSCHE, M PIEPENSTOCK, M DIEDERICH, A GRUNEWALD, T KJAER, K VAKNIN, D TI INFLUENCE OF SURFACE-CHEMISTRY ON THE STRUCTURAL ORGANIZATION OF MONOMOLECULAR PROTEIN LAYERS ADSORBED TO FUNCTIONALIZED AQUEOUS INTERFACES SO BIOPHYSICAL JOURNAL LA English DT Article ID AIR-WATER-INTERFACE; TWO-DIMENSIONAL CRYSTALS; TOXIN B-SUBUNIT; X-RAY; CHOLERA-TOXIN; PHOSPHOLIPID MONOLAYERS; FLUORESCENCE MICROSCOPY; RECOGNITION PROCESSES; MONOCLONAL-ANTIBODY; NEUTRON-DIFFRACTION AB The molecular organization of streptavidin (SA) bound to aqueous surface monolayers of biotin-functionalized lipids and binary lipid mixtures has been investigated with neutron reflectivity and electron and fluorescence microscopy. The substitution of deuterons (H-2) for protons (H-1), both in subphase water molecules and in the alkyl chains of the lipid surface monolayer, was utilized to determine the interface structure on the molecular length scale. In all cases studied, the protein forms monomolecular layers underneath the interface with thickness values of approximately 40 angstrom. A systematic dependence of the structural properties of such self-assembled SA monolayers on the surface chemistry was observed: the lateral protein density depends on the length of the spacer connecting the biotin moiety and its hydrophobic anchor. The hydration of the lipid head groups in the protein-bound state depends on the dipole moment density at the interface. C1 RISO NATL LAB, DEPT PHYS, DK-4000 ROSKILDE, DENMARK. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES LAB, AMES, IA 50011 USA. RP LOSCHE, M (reprint author), JOHANNES GUTENBERG UNIV, INST PHYS CHEM, D-55099 MAINZ, GERMANY. RI Losche, Mathias/J-2986-2013; Vaknin, David/B-3302-2009 OI Losche, Mathias/0000-0001-6666-916X; Vaknin, David/0000-0002-0899-9248 NR 54 TC 36 Z9 37 U1 0 U2 2 PU CELL PRESS PI CAMBRIDGE PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD NOV PY 1993 VL 65 IS 5 BP 2160 EP 2177 PG 18 WC Biophysics SC Biophysics GA MF321 UT WOS:A1993MF32100045 PM 8298041 ER PT J AU SABATH, DE SPANGLER, EA RUBIN, EM STAMATOYANNOPOULOS, G AF SABATH, DE SPANGLER, EA RUBIN, EM STAMATOYANNOPOULOS, G TI ANALYSIS OF THE HUMAN ZETA-GLOBIN GENE PROMOTER IN TRANSGENIC MICE SO BLOOD LA English DT Article ID DOMINANT CONTROL REGION; LOCUS-CONTROL REGION; ERYTHROID-SPECIFIC EXPRESSION; I HYPERSENSITIVE SITE; HIGH-LEVEL EXPRESSION; DEVELOPMENTAL REGULATION; GAMMA-GLOBIN; UPSTREAM; BINDING; TRANSCRIPTION C1 UNIV WASHINGTON,DEPT MED,DIV MED GENET,SEATTLE,WA 98195. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV RES MED,BERKELEY,CA 94720. RP SABATH, DE (reprint author), UNIV WASHINGTON,DEPT LAB MED,SB-10,1959 NE PACIFIC ST,SEATTLE,WA 98195, USA. FU NHLBI NIH HHS [HL20899, HL20985]; NIDDK NIH HHS [DK31232] NR 40 TC 21 Z9 22 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 1 PY 1993 VL 82 IS 9 BP 2899 EP 2905 PG 7 WC Hematology SC Hematology GA ME657 UT WOS:A1993ME65700036 PM 8219238 ER PT J AU PARKER, MJ RAMAN, S AF PARKER, MJ RAMAN, S TI A CASE-STUDY OF THE NOCTURNAL BOUNDARY-LAYER OVER A COMPLEX TERRAIN SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID TURBULENCE AB A case study of the structure of the nocturnal boundary layer (NBL) over complex terrain is presented. Observations were made during the third night of Project STABLE (Weber and Kurzeja, 1991), whose main goal was to study turbulence and diffusion over the complex terrain of the Savannah River Site (SRS) near Augusta, Georgia. The passage of a mesoscale phenomenon, defined as a turbulent meso-flow (TMF) with an explanation of the nomenclature used, and a composite structure of the lowest few hundred meters over complex terrain are presented. The spatial extent of the TMF was at least 30-50 km, but the forcing is not well understood. The TMF occurred without the presence of a synoptic-scale cold front, under clear conditions, and with no discernible discontinuity in a microbarograph pressure trace. The structure of the NBL over the complex terrain at SRS differed from the expected homogeneous terrain NBL. The vertical structure exhibited dual low level wind maxima, dual inversions. and a persistent elevated turbulent layer. The persistent elevated turbulent layer, with a spatial extent of at least 30 km, was observed for the entire night. The persistent adiabatic layer may have resulted from turbulence induced by shear instability. RP PARKER, MJ (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,ENVIRONM TECHNOL SECT,AIKEN,SC 29808, USA. NR 10 TC 10 Z9 10 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD NOV PY 1993 VL 66 IS 3 BP 303 EP 324 DI 10.1007/BF00705480 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MB096 UT WOS:A1993MB09600006 ER PT J AU ANDERSON, RW NEUMANN, AU PERELSON, AS AF ANDERSON, RW NEUMANN, AU PERELSON, AS TI A CAYLEY TREE IMMUNE NETWORK MODEL WITH ANTIBODY DYNAMICS SO BULLETIN OF MATHEMATICAL BIOLOGY LA English DT Article ID NATURAL ANTIBODIES; POPULATION-DYNAMICS; IDIOTYPIC NETWORKS; COMPUTER-MODEL; SYSTEM; CONNECTIVITY; MICE; ESTABLISHMENT; REPERTOIRE; ANTIGEN AB A Cayley tree model of idiotypic networks that includes both B cell and antibody dynamics is formulated and analysed. As in models with B cells only, localized states exist in the network with limited numbers of activated clones surrounded by virgin or near-virgin clones. The existence and stability of these localized network states are explored as a function of model parameters. As in previous models that have included antibody, the stability of immune and tolerant localized states are shown to depend on the ratio of antibody to B cell lifetimes as well as the rate of antibody complex removal. As model parameters are varied, localized steady-states can break down via two routes: dynamically, into chaotic attractors, or structurally into percolation attractors. For a given set of parameters percolation and chaotic attractors can coexist with localized attractors, and thus there do not exist clear cut boundaries in parameter space that separate regions of localized attractors from regions of percolation and chaotic attractors. Stable limit cycles, which are frequent in the two-clone antibody B cell (AB) model, are only observed in highly connected networks. Also found in highly connected networks are localized chaotic attractors. As in experiments by Lundkvist et al. (1989. Proc. natn. Acad. Sci. U.S.A. 86, 5074-5078), injection of Ab1 antibodies into a system operating in the chaotic regime can cause a cessation of fluctuations of Ab1 and Ab2 antibodies, a phenomenon already observed in the two-clone AB model. Interestingly, chaotic fluctuations continue at higher levels of the tree, a phenomenon observed by Lundkvist et al. but not accounted for previously. C1 SANTA FE INST,SANTA FE,NM 87501. RP ANDERSON, RW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. FU FIC NIH HHS [F05-TW04809]; NCRR NIH HHS [RR06555] NR 56 TC 23 Z9 23 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0092-8240 J9 B MATH BIOL JI Bull. Math. Biol. PD NOV PY 1993 VL 55 IS 6 BP 1091 EP 1131 DI 10.1007/BF02460701 PG 41 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA MJ583 UT WOS:A1993MJ58300004 PM 8281129 ER PT J AU BEVELHIMER, MS ADAMS, SM AF BEVELHIMER, MS ADAMS, SM TI A BIOENERGETICS ANALYSIS OF DIEL VERTICAL MIGRATION BY KOKANEE SALMON, ONCORHYNCHUS-NERKA SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID JUVENILE SOCKEYE-SALMON; LAKE-MICHIGAN; TEMPERATURE; BEHAVIOR; ECOLOGY; MODEL; RATES; FOOD; FISH; CONSUMPTION AB Diel vertical migration of fishes is probably a result of the combined effects of several selective forces, including predator avoidance, foraging efficiency, and bioenergetic efficiency. We considered both foraging efficiency and energetic efficiency as a combined effect which we called growth maximization. The importance of growth maximization as a selective force was evaluated with a bioenergetics-based model to estimate growth rates of various migration scenarios of kokanee salmon, Oncorhychus nerka. Environmental parameters (temperature and zooplankton distributions) in the model were obtained from a North Carolina reservoir with an established population of kokanee. The simulations demonstrated that vertical migrations can be energetically advantageous when kokanee and their prey are thermally segregated and that ontogenetic and seasonal differences in the optimal migration strategy should be expected. The general rule for vertical migration as determined from the simulations is to feed where net energy intake is maximized and then reside when not feeding where energetic costs are minimized and food is digested to the point that consumption during the next feeding period is not limited by the amount of undigested food remaining in the stomach. Data obtained from vertical gill nets and hydroacoustics were compared with model predictions. C1 UNIV TENNESSEE,GRAD PROGRAM ECOL,KNOXVILLE,TN 37996. RP BEVELHIMER, MS (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 41 TC 12 Z9 13 U1 1 U2 11 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD NOV PY 1993 VL 50 IS 11 BP 2236 EP 2349 PG 114 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA MZ456 UT WOS:A1993MZ45600006 ER PT J AU KEELAND, BD SHARITZ, RR AF KEELAND, BD SHARITZ, RR TI ACCURACY OF TREE GROWTH MEASUREMENTS USING DENDROMETER BANDS SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Note ID SWAMP AB Dendrometer bands are commonly used to make repeated measurements of tree circumference despite their tendency to underestimate first-year growth. Underestimates of growth are generally attributed to slack remaining in the bands after installation. To test for first-year measurement errors, 60 trees were fitted with a second dendrometer band 2 years after installation of the first band. The new bands consistently showed significantly less growth than the old bands (old-band measurements were assumed to represent true growth). Regression equations were developed to relate new-band estimates to true growth. There were no significant differences in regression intercepts for the three tree species tested, but significant differences in regression slopes were detected. Comparisons between canopy and subcanopy trees and between angiosperm species (Nyssa aquatica L. and Nyssa sylvatica var. biflora (Waiter) Sargent) and a gymnosperm (Taxodium distichum (L.) Rich.) explained 95.7% of the variance in regression slopes for the individual species. It appears that in addition to band slack, part of the first-year error in dendrometer band data may result from species differences that are related to bark and stem characteristics. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 19 TC 48 Z9 50 U1 1 U2 13 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD NOV PY 1993 VL 23 IS 11 BP 2454 EP 2457 DI 10.1139/x93-304 PG 4 WC Forestry SC Forestry GA MQ183 UT WOS:A1993MQ18300018 ER PT J AU SMITH, GR BALLINGER, RE CONGDON, JD AF SMITH, GR BALLINGER, RE CONGDON, JD TI THERMAL ECOLOGY OF THE HIGH-ALTITUDE BUNCH GRASS LIZARD, SCELOPORUS-SCALARIS SO CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE LA English DT Article ID LIVE-BEARING LIZARD; THERMOREGULATORY BEHAVIOR; VIVIPAROUS LIZARD; NULL HYPOTHESES; ANOLIS LIZARDS; GROWTH-RATE; TEMPERATURE; SENSITIVITY; POPULATIONS; PERFORMANCE AB The thermal ecology of a high-altitude lizard, Sceloporus scalar's, was investigated in the Chiricahua Mountains of southeastern Arizona, where the lizards are active on sunny days throughout the year. Mean body temperature was 32.6 degrees C (range 12.6-39 degrees C) and mean air temperature was 20.2 degrees C (range 5.2-36.4 degrees C). The slope of the body temperature versus air temperature regression was 0.23. Monthly differences in body temperature were observed, with the highest body temperatures observed in early summer. Lizards at three study sites with differing slope and vegetative cover had different mean body temperatures. Males had higher body temperatures than both nongravid and gravid females. Maintenance of elevated body temperatures even during winter lengthens the activity and growing season, permitting early maturity with potentially important life-history consequences. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP SMITH, GR (reprint author), UNIV NEBRASKA,SCH BIOL SCI,348 MANTER HALL,LINCOLN,NE 68588, USA. NR 37 TC 17 Z9 20 U1 0 U2 2 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4301 J9 CAN J ZOOL JI Can. J. Zool.-Rev. Can. Zool. PD NOV PY 1993 VL 71 IS 11 BP 2152 EP 2155 DI 10.1139/z93-302 PG 4 WC Zoology SC Zoology GA MQ719 UT WOS:A1993MQ71900003 ER PT J AU RHODES, OE SMITH, LM CHESSER, RK AF RHODES, OE SMITH, LM CHESSER, RK TI TEMPORAL COMPONENTS OF GENETIC-VARIATION IN MIGRATING AND WINTERING AMERICAN WIGEON SO CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE LA English DT Article ID POPULATIONS; DIVERSITY; DIFFERENTIATION; FREQUENCIES; PHILOPATRY; GEESE; FLOW AB Data from allele frequencies of wintering American wigeon (Anas americana) from the Southern High Plains (SHP) of Texas were used to monitor changes in genetic characteristics of the wintering population through time, and to estimate the average proportion of total genetic variation partitioned among parent breeding populations. Wigeon were surveyed electrophoretically for genetic variation at 25 biochemical loci. Changes in total gene diversity were observed throughout the study period (5 October 1988 to 15 March 1989) at numerous loci. Significant temporal changes in the genetic composition of the wintering population were detected, and a minimum of 7% of the total genetic variation in these wigeon was thought to be partitioned among the breeding populations represented on the SHP. A new influx of migrating wigeon, weather-related movements of wigeon, or spatial subdivision of breeding populations on the SHP may be responsible for shifts observed in the genetic characteristics of the wintering population. Significant heterozygote deficiencies in the sample of wintering wigeon suggest that this species maintains some degree of genetic structure on the breeding grounds. Genetic data collected from wintering waterfowl may provide minimum expectations of the degree of genetic subdivision among breeding populations and may help waterfowl biologists to detect changes in the composition of wintering waterfowl populations through time. C1 TEXAS TECH UNIV,DEPT RANGE & WILDLIFE MANAGEMENT,LUBBOCK,TX 79408. RP RHODES, OE (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 36 TC 16 Z9 16 U1 0 U2 1 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4301 J9 CAN J ZOOL JI Can. J. Zool.-Rev. Can. Zool. PD NOV PY 1993 VL 71 IS 11 BP 2229 EP 2235 DI 10.1139/z93-313 PG 7 WC Zoology SC Zoology GA MQ719 UT WOS:A1993MQ71900014 ER PT J AU SUGAMA, T CARCIELLO, NR AF SUGAMA, T CARCIELLO, NR TI CARBONATION OF CALCIUM-PHOSPHATE CEMENTS AFTER LONG-TERM EXPOSURE TO NA2CO3-LADEN WATER AT 250-DEGREES-C SO CEMENT AND CONCRETE RESEARCH LA English DT Article ID ALUMINATE CEMENTS AB The rates of Na2CO3-induced carbonation of calcium phosphate cements (CPC) at 250-degrees-C derived from various calcium aluminate cement (CAC) reactants, depended primarily on the amount of non-reactive CAC reactants remaining in the CPC material after it was autoclaved. Secar 41 CAC, consisting of monocalcium aluminate (CA) and gehlenite (C2AS), had a high reactivity with the NH4H2PO4-based fertilizer (Poly-N) forming a CPC matrix, thereby resulting in rapid setting. Such behavior reflected the formation of hydroxyapatite (HOAp) and boehmite which play an important role in minimizing the carbonation rate at a hydrothermal temperature of 250-degrees-G. In contrast, Secar 80, having monocalcium dialuminate (CA2) as its major component, retarded the reaction between CAC and Poly-N, so that a large amount of non-reactive CAC remained in the 250-degrees-C-autoclaved CPC specimens. Thus, the high susceptibility of the remaining CAC reactant to carbonation resulted in a yield of almost-equal-to 1.7 % CaCO3 after exposure for 120,days. The loss of strength for all CPC specimens depended on the degree of crystallinity of the HOAp and gamma-AlOOH phases growing in the amorphous phases, but was independent of its rate of carbonation. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 5 TC 8 Z9 8 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0008-8846 J9 CEMENT CONCRETE RES JI Cem. Concr. Res. PD NOV PY 1993 VL 23 IS 6 BP 1409 EP 1417 DI 10.1016/0008-8846(93)90078-N PG 9 WC Construction & Building Technology; Materials Science, Multidisciplinary SC Construction & Building Technology; Materials Science GA MD823 UT WOS:A1993MD82300018 ER PT J AU YANG, DL YU, T LIN, MC MELIUS, CF AF YANG, DL YU, T LIN, MC MELIUS, CF TI THE REACTION OF CN WITH CH-4 AND CD4 - AN EXPERIMENTAL AND THEORETICAL-STUDY SO CHEMICAL PHYSICS LA English DT Article ID DIODE-LASER ABSORPTION; RADICAL REACTIONS; RATE CONSTANTS; H BONDS; KINETICS; TEMPERATURE; MOLECULES; SECONDARY; HYDROGEN; CYANOGEN AB The kinetics of the CN reaction with CH4 and CD4 were studied by laser induced fluorescence in the temperature range of 183 to 740 K. The measured rates may effectively be expressed, in units of cm3/s, by k(CH4) = 5.15 X 10(-16) T1.53 exp(-504/T) and k(CD4) = 8.51 x 10(-19) T2.38 exp(-403/T). Both reactions increased monotonically with temperature and exhibited a significant isotope effect. Variational TST calculations were performed for these reactions in which the energies of the transition state were calculated at several points along the reaction coordinate using the BAC-MP4 method. It was determined that as the temperature was increased, the position of the transition state moved towards smaller values of the NC:HCH3(DCD3) reaction coordinates for both CH4 and CD4 reactions. This affected both the zero-point energies and entropies of reactions. Good agreement was found between the calculated and experimental activation energies of the reactions. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322. NR 23 TC 20 Z9 20 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD NOV 1 PY 1993 VL 177 IS 1 BP 271 EP 280 DI 10.1016/0301-0104(93)80195-F PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ME037 UT WOS:A1993ME03700026 ER PT J AU HOLLINGSHEAD, JA TYSZKIEWICZ, MT MCCARLEY, RE AF HOLLINGSHEAD, JA TYSZKIEWICZ, MT MCCARLEY, RE TI SOL-GEL APPROACH TO SYNTHESIS OF MO2O3 - MOO(OH) AND OTHER INTERMEDIATES FROM HYDROLYSIS OF MOLYBDENUM(III) ALKOXIDES AND MO2(NME2)6 SO CHEMISTRY OF MATERIALS LA English DT Article ID PRECURSORS; ZIRCONIUM; CLUSTERS; OXIDES; MO AB The products of hydrolysis of Mo2(NMe2)6, Mo4(OEt)12, Mo2(O-i-Pr)6, and Mo2(O-t-Bu)6 in hydrocarbon solvents have been studied. The latter two result in extensive oxidation of the molybdenum and cannot be used for preparation of Mo(III) compounds. Hydrolysis of Mo2(NMe2)6 provides a black crystalline precipitate that yields an amorphous red-brown material, Mo3(OH)9(NMe2).1/2HNMe2, upon filtration and drying. A brown compound of Mo(III), Mo2(OH)5(OEt), is obtained upon hydrolysis of Mo4(OEt)12. Thermolysis of Mo3(OH)9(NMe2).1/2HNMe2 ultimately yields a material that retains nitrogen tenaciously. Thermolysis of Mo2(OH)5(OEt) in vacuo at 240-degrees-C leads to evolution of ethene and ethane as major gaseous products and oxidation of the molybdenum from an average oxidation state 3.0 to 3.4. Upon reaction of Mo2(OH)5(OEt) with H2 at 250-degrees-C, the new compound MoO(OH) is produced. Conversion of the latter to Mo2O3 was not successful, giving the material Mo3O5 instead. The reactive MoO(OH) converted cleanly to the crystalline layered compound LiMoO2 upon reaction with Li2CO3 at 600-degrees-C in vacuo. Magnetic susceptibilities and Mo 3d XPS data are reported for Mo2(OH)5(OEt) and MoO(OH). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. NR 20 TC 5 Z9 5 U1 2 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD NOV PY 1993 VL 5 IS 11 BP 1600 EP 1604 DI 10.1021/cm00035a004 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MJ090 UT WOS:A1993MJ09000004 ER PT J AU ROBERTS, GL KAUZLARICH, SM GLASS, RS ESTILL, JC AF ROBERTS, GL KAUZLARICH, SM GLASS, RS ESTILL, JC TI INVESTIGATION OF THE MECHANISM OF ELECTROSYNTHESIS OF THE SUPERCONDUCTOR BA1-XKXBIO3 SO CHEMISTRY OF MATERIALS LA English DT Article ID ELECTROCHEMICAL SYNTHESIS; SINGLE-CRYSTALS; MOLTEN-SALT; BA0.6K0.4BIO3; PEROVSKITE; ELECTRODEPOSITION; GROWTH; SYSTEM; OXIDES; COPPER AB Cyclic voltammetry has been used to investigate the electrodeposition of the superconducting material, Ba1-xKxBiO3. Reactions occurring at a Pt substrate electrode over a wide potential range have been assigned. Evidence has been found for time-dependent (cycle number) electrochemical behavior. High-quality superconducting crystals can be obtained only when the potential of the electrode is held in the region of predominantly kinetic control. The Bi(III) to Bi(V) oxidation appears as two peaks during the anodic scan. Reproducible cyclic voltammograms were obtained only after the KOH flux containing Ba(OH)2 and Bi2O3 Was equilibrated for 24 h under a water-saturated argon atmosphere. High-quality superconductive crystals are obtained only when the deposition potential is on the rising portion of the Bi(III) to Bi(IV) oxidation peak. C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RI Kauzlarich, Susan/H-1439-2011 NR 48 TC 6 Z9 6 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD NOV PY 1993 VL 5 IS 11 BP 1645 EP 1650 DI 10.1021/cm00035a011 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MJ090 UT WOS:A1993MJ09000011 ER PT J AU BRENEMAN, JW RAMSEY, MJ LEE, DA EVELETH, GG MINKLER, JL TUCKER, JD AF BRENEMAN, JW RAMSEY, MJ LEE, DA EVELETH, GG MINKLER, JL TUCKER, JD TI THE DEVELOPMENT OF CHROMOSOME-SPECIFIC COMPOSITE DNA PROBES FOR THE MOUSE AND THEIR APPLICATION TO CHROMOSOME PAINTING SO CHROMOSOMA LA English DT Article ID FLUORESCENCE INSITU HYBRIDIZATION; INDUCED CELL DEATH; PERIPHERAL LYMPHOCYTES; IONIZING-RADIATION; SATELLITE DNA; X-CHROMOSOME; ABERRATIONS; TRANSLOCATIONS; LIBRARIES; FREQUENCY AB The speed and ease of human cytogenetic analysis has been greatly enhanced by the technique of fluorescence in situ hybridization (FISH). Non-radioactive fluorescently tagged complex DNA probes specific for individual chromosomes can be hybridized to conventionally obtained metaphase chromosome spreads. Several chromosomes may be ''painted'' concurrently by using combinations of different labeled probes. Surveys of chromosome breakage and rearrangement may be performed very quickly by avoiding the time consuming process of GTG-banding. The application of FISH to mouse cytogenetics would allow large scale molecular toxicology studies to be conducted on the effects of such environmental insults as potential carcinogens, mutagens and radiation. Progress has been hampered, however, as the Mus musculus karyotype consists of 40 acrocentric chromosomes of approximately the same size, making the recognition and separation of individual chromosomes very difficult. We now describe the successful production and application of chromosome-specific composite DNA probes for M. musculus chromosomes 2 and 8. Stable Robertsonian translocated chromosomes were isolated on a flow sorter and their DNA subsequently amplified by degenerate oligonucleotide primer (DOP) PCR. Small pools (300 copies) of each chromosome were denatured at 94-degrees-C then annealed with the primer at 30-degrees-C for 15 cycles. This was followed by 20 cycles at an annealing temperature of 62-degrees-C. Additional amplification was performed at an annealing temperature of 62-degrees-C. The chromosome-specific DNA was labeled with biotin 11-dUTP by nick translation and used for FISH. The usefulness of the technique for translocation detection is demonstrated by analyzing chromosome exchanges induced in mice irradiated with Cs-132 gamma rays. C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,POB 808,L-452,LIVERMORE,CA 94550. FU NCI NIH HHS [CA55861-01] NR 40 TC 54 Z9 54 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0009-5915 J9 CHROMOSOMA JI Chromosoma PD NOV PY 1993 VL 102 IS 9 BP 591 EP 598 DI 10.1007/BF00352306 PG 8 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA MJ892 UT WOS:A1993MJ89200001 PM 7508363 ER PT J AU ALLEN, MJ LEE, C LEE, JD POGANY, GC BALOOCH, M SIEKHAUS, WJ BALHORN, R AF ALLEN, MJ LEE, C LEE, JD POGANY, GC BALOOCH, M SIEKHAUS, WJ BALHORN, R TI ATOMIC-FORCE MICROSCOPY OF MAMMALIAN SPERM CHROMATIN SO CHROMOSOMA LA English DT Article ID SCANNING TUNNELING MICROSCOPY; DNA-MOLECULES; MOUSE SPERM; PROTEIN; CELLS; ULTRASTRUCTURE; SPERMATOZOA; DISSECTION; BACTERIA; NUCLEAR AB We have used the atomic force microscope (AFM) to image the surfaces of intact bull, mouse and rat sperm chromatin and partially decondensed mouse sperm chromatin attached to coverglass. High resolution AFM imaging was performed in air and saline using uncoated, unfixed and unstained chromatin. Images of the surfaces of intact chromatin from all three species and of an AFM-dissected bull sperm nucleus have revealed that the DNA is organized into large nodular subunits, which vary in diameter between 50 and 100 nm. Other images of partially decondensed mouse sperm chromatin show that the nodules are arranged along thick fibers that loop out away from the nucleus upon decondensation. These fibers appear to stretch or unravel, generating narrow smooth fibers with thicknesses equivalent to a single DNA-protamine complex. High resolution AFM images of the nodular subunits suggest that they are discrete, ellipsoid-shaped DNA packaging units possibly only one level of packaging above the protamine-DNA complex. C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. NO ARIZONA UNIV,DEPT BIOL SCI,FLAGSTAFF,AZ 86011. NR 50 TC 58 Z9 59 U1 1 U2 8 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0009-5915 J9 CHROMOSOMA JI Chromosoma PD NOV PY 1993 VL 102 IS 9 BP 623 EP 630 DI 10.1007/BF00352310 PG 8 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA MJ892 UT WOS:A1993MJ89200005 PM 8306824 ER PT J AU LUTZ, ED GRAY, LJ AF LUTZ, ED GRAY, LJ TI ANALYTIC EVALUATION OF SINGULAR BOUNDARY INTEGRALS WITHOUT CPV SO COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING LA English DT Article ID ELEMENT METHOD AB Boundary integral equations are generally derived by employing a Cauchy Principal Value definition for the singular integral involving the derivative of the Green function. As a consequence, evaluation of this integral requires special attention, and computing the associated 'solid angle coefficient' can often pose difficulties. As discussed herein, these problems can be avoided by defining the integral directly, in terms of a limit to the boundary. This approach leads to a straightforward evaluation procedure. C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. NR 17 TC 22 Z9 22 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1069-8299 J9 COMMUN NUMER METH EN JI Commun. Numer. Methods Eng. PD NOV PY 1993 VL 9 IS 11 BP 909 EP 915 DI 10.1002/cnm.1640091107 PG 7 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA MH912 UT WOS:A1993MH91200006 ER PT J AU DVINSKY, AS DUKOWICZ, JK AF DVINSKY, AS DUKOWICZ, JK TI NULL-SPACE-FREE METHODS FOR THE INCOMPRESSIBLE NAVIER-STOKES EQUATIONS ON NON-STAGGERED CURVILINEAR GRIDS SO COMPUTERS & FLUIDS LA English DT Article ID FLOW AB The discrete Poisson equation used to enforce incompressibility in the projection method of Chorin has a null space. The null space often manifests itself in producing solutions with checkerboard pressure fields. The staggering of variables by Harlow and Welch effectively eliminates the null space; however, when it is used in the context of curvilinear coordinates its consistent implementation is complicated because it requires the use of contravariant velocity components and variable coordinate base vectors. In this paper we present and analyze a null-space-free approximate projection method, which is based on cartesian vector components and non-staggered grids. The approximate projection method has been implemented in the computer code HEMO. Several examples of two- and three-dimensional flows using HEMO are presented. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DVINSKY, AS (reprint author), DAAT RES CORP,17 MONTVIEW DR,LYME,NH 03768, USA. NR 22 TC 7 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7930 J9 COMPUT FLUIDS JI Comput. Fluids PD NOV PY 1993 VL 22 IS 6 BP 685 EP 696 DI 10.1016/0045-7930(93)90033-6 PG 12 WC Computer Science, Interdisciplinary Applications; Mechanics SC Computer Science; Mechanics GA LQ566 UT WOS:A1993LQ56600001 ER PT J AU PAWEL, SJ AF PAWEL, SJ TI CORROSION OF NICKEL-BASED ALLOYS IN ACIDIFIED LITHIUM-CHLORIDE SOLUTIONS SO CORROSION LA English DT Article DE ALLOY 20MO6; ALLOY B-2; ALLOY C-22; ALLOY C-276; ALLOY G-30; HYDROCHLORIC ACID; IMMERSION; LITHIUM CHLORIDE; NICKEL-BASED ALLOYS; PH; TEMPERATURE AB Immersion tests were performed on nickel (Ni)-based alloys in acidified 2 M lithium chloride (LiCl) solutions as a function of temperature and pH. Results indicated alloy C-22 (UNS N06022) and alloy C-276 (UNS N10276) were very resistant to corrosion in this environment to pH 1 at 95-degrees-C. Other alloys revealed extreme corrosion at low pH (alloy G-30 [UNS N06030] and alloy 20Mo6 [UNS N08026]) or accelerated corrosion due to solution aeration (alloy B-2 [UNS N10665]) and were not recommended for the process described. Failures of C-276 in similar service environments were attributed to poor control of process pH, with values less-than-or-equal-to 0.5 leading to extreme general corrosion. RP PAWEL, SJ (reprint author), OAK RIDGE Y-12 PLANT,DIV DEV,POB 2009,OAK RIDGE,TN 37831, USA. NR 6 TC 4 Z9 4 U1 1 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD NOV PY 1993 VL 49 IS 11 BP 929 EP 933 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MH540 UT WOS:A1993MH54000008 ER PT J AU PANOFF, JM AF PANOFF, JM TI CONTROL OF A LOCUS THAT IS REQUIRED FOR GROWTH OF ANABAENA PCC7120 AT LOW-TEMPERATURE SO CURRENT MICROBIOLOGY LA English DT Article ID SYNECHOCYSTIS SP PCC-6803; HEAT-SHOCK PROTEINS; ESCHERICHIA-COLI; FATTY-ACIDS; CYANOBACTERIUM; DESATURATION; IDENTIFICATION; THERMOMETER; PCC6803; GENE AB Mutant TLT2, obtained by insertion of a lux-bearing transposon in Anabaena sp. strain PCC7120, increases in luminescent intensity when transferred from 30-degrees to 20-degrees-C. The addition of different types of antibiotics to the culture medium showed that some of those known to have the ribosome as target led to an increase of luminescence of TLT2 at 30-degrees-C, in accord with the idea that ribosomes may, be sensors of cold shock. Furthermore, rifampicin, which destabilized luminescence at 20-degrees-C, decreased the rate of loss of luminescence upon transfer of TLT2 from 20-degrees to 30-degrees-C; this suggests that luminescence of TLT2 is transcriptionally controlled by a repressor at 30-degrees-C. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 25 TC 6 Z9 6 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0343-8651 J9 CURR MICROBIOL JI Curr. Microbiol. PD NOV PY 1993 VL 27 IS 5 BP 273 EP 276 DI 10.1007/BF01575991 PG 4 WC Microbiology SC Microbiology GA MB538 UT WOS:A1993MB53800005 ER PT J AU ALLMEN, M DYER, CR AF ALLMEN, M DYER, CR TI COMPUTING SPATIOTEMPORAL RELATIONS FOR DYNAMIC PERCEPTUAL ORGANIZATION SO CVGIP-IMAGE UNDERSTANDING LA English DT Article ID VISUAL-PERCEPTION; COMPUTATION; MOTION C1 UNIV WISCONSIN,DEPT COMP SCI,MADISON,WI 53706. RP ALLMEN, M (reprint author), SANDIA NATL LABS,POB 969,ORG 8117,LIVERMORE,CA 94551, USA. NR 38 TC 9 Z9 9 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 1049-9660 J9 CVGIP-IMAG UNDERSTAN PD NOV PY 1993 VL 58 IS 3 BP 338 EP 351 DI 10.1006/cviu.1993.1048 PG 14 WC Computer Science, Software Engineering SC Computer Science GA MF915 UT WOS:A1993MF91500005 ER PT J AU BRESHEARS, DD WHICKER, FW HAKONSON, TE AF BRESHEARS, DD WHICKER, FW HAKONSON, TE TI ORCHESTRATING ENVIRONMENTAL-RESEARCH AND ASSESSMENT FOR REMEDIATION SO ECOLOGICAL APPLICATIONS LA English DT Letter ID NAPAP; SCIENCE; RISK C1 COLORADO STATE UNIV,DEPT RADIOL HLTH SCI,FT COLLINS,CO 80523. SAVANNAH RIVER ECOL LAB,AIKEN,SC. RP BRESHEARS, DD (reprint author), LOS ALAMOS NATL LAB,ENVIRONM SCI GRP,MAIL STOP J495,LOS ALAMOS,NM 87545, USA. RI Breshears, David/B-9318-2009 OI Breshears, David/0000-0001-6601-0058 NR 30 TC 5 Z9 5 U1 0 U2 0 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD NOV PY 1993 VL 3 IS 4 BP 590 EP 594 PG 5 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA MF070 UT WOS:A1993MF07000020 PM 27759302 ER PT J AU HIRST, E BLANK, E AF HIRST, E BLANK, E TI QUANTIFYING REGULATORY DISINCENTIVES TO UTILITY DSM PROGRAMS SO ENERGY LA English DT Article AB In principle, current regulation of investor-owned electric utilities is simple: the more electricity a utility sells, the more money it makes for its stockholders. This link between sales and earnings encourages utilities to sell more electricity, whether or not such increased sales benefit customers. For the same reason, utilities often find it difficult to conduct even the most cost-effective energy-efficiency programs: these programs reduce sales, and reduced sales cut earnings. Although the theoretical underpinnings of this problem have been carefully explained, little quantitative analysis exists to identify the magnitude of the problem. This paper provides that quantitative analysis for a Rocky Mountain utility. It shows that a utility that runs modest energy-efficiency programs will find its return on equity cut by almost 100 basis points. Sensitivity analyses confirm that this earnings loss will occur under a wide range of sizes and load factors of energy-efficiency programs, retail price levels and structures, and short-run marginal costs. Shareholder losses are greatest for utilities that run ambitious programs and for which the difference between retail electricity price and average fuel cost is high. This erosion of earnings occurs even though utility customers may receive substantial benefits from these energy-efficiency programs because rapid load growth accelerates the need to build new and often expensive generating capacity. C1 LAND & WATER FUND ROCKIES,BOULDER,CO 80302. RP HIRST, E (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD NOV PY 1993 VL 18 IS 11 BP 1091 EP 1105 DI 10.1016/0360-5442(93)90081-N PG 15 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA MJ403 UT WOS:A1993MJ40300001 ER PT J AU STOCK, LM MUNTEAN, JV AF STOCK, LM MUNTEAN, JV TI CHEMICAL CONSTITUTION OF POCAHONTAS NO-3 COAL SO ENERGY & FUELS LA English DT Article; Proceedings Paper CT 7TH ANNUAL TECHNICAL CONFERENCE OF THE ADVANCED COMBUSTION ENGINEERING CENTER CY MAR 03-04, 1993 CL PARK CITY, UT SP BRIGHAM YOUNG UNIV, UNIV UTAH ID ARGONNE PREMIUM COALS; SOLID-STATE NMR; MAGNETIC-RESONANCE; SAMPLE PROGRAM; SPECTROSCOPY; SULFUR; FORMS; RANK AB The available structural information about Pocahontas No. 3 coal, APCSP 5, is assembled and critically evaluated. A chemical structure is presented that portrays this highly aromatic coal with its abundant methyl groups and bridging biaryl and heterocyclic groups. RP STOCK, LM (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 45 TC 28 Z9 29 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 1993 VL 7 IS 6 BP 704 EP 709 DI 10.1021/ef00042a003 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MJ578 UT WOS:A1993MJ57800003 ER PT J AU HURT, RH AF HURT, RH TI REACTIVITY DISTRIBUTIONS AND EXTINCTION PHENOMENA IN COAL CHAR COMBUSTION SO ENERGY & FUELS LA English DT Article; Proceedings Paper CT 7TH ANNUAL TECHNICAL CONFERENCE OF THE ADVANCED COMBUSTION ENGINEERING CENTER CY MAR 03-04, 1993 CL PARK CITY, UT SP BRIGHAM YOUNG UNIV, UNIV UTAH ID TEMPERATURE AB Based on in situ optical measurements and off-line analyses for four coals, the basic features of single-particle pulverized coal char combustion have been elucidated as a function of carbon conversion. Two regimes can be clearly defined: one at low carbon conversion, where the reacting particle populations have properties that are nearly time invariant and a second regime at higher carbon conversion where the distribution properties change dramatically. At low carbon conversion, there is a broad distribution of single-particle combustion rates, reflecting the heterogeneity in the parent fuel. Particle-to-particle reactivity differences are shown to be the primary cause of the broad temperature distribution for Pocahontas coal char. At high carbon conversion, carbon-rich particles can be distinguished statistically from inorganic-rich particles by in situ measurement of their spectral emissive factors at 800 nm. In each case where char carbon conversion proceeds past 50-60%, many particles are observed to undergo large temperature decreases resulting from a loss of reactivity, referred to as near-extinction events. Near-extinction is generally observed to occur before large changes are observed in the particle optical properties, suggesting that deactivation occurs when the particles are still carbon-rich. Plots of particle temperature vs emissive factor conveniently illustrate and summarize the process of char particle combustion to high conversion. These plots reveal two distinct stages in the combustion lifetime of a char particle: (1) a rapid combustion stage at low carbon conversion, followed by (2) a deactivation and near-extinction at roughly constant optical properties, initiating a final burnout stage that occurs slowly and at low temperatures. The two-stage nature of the char combustion process significantly lengthens the time required to achieve high carbon conversion, and the existence of two stages cannot be predicted by conversion-independent kinetic models. More realistic char oxidation models are needed that account for fuel heterogeneity and conversion-dependence effects. RP HURT, RH (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550, USA. NR 18 TC 21 Z9 21 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 1993 VL 7 IS 6 BP 721 EP 733 DI 10.1021/ef00042a005 PG 13 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MJ578 UT WOS:A1993MJ57800005 ER PT J AU BAXTER, LL RICHARDS, GH OTTESEN, DK HARB, JN AF BAXTER, LL RICHARDS, GH OTTESEN, DK HARB, JN TI IN-SITU, REAL-TIME CHARACTERIZATION OF COAL ASH DEPOSITS USING FOURIER-TRANSFORM INFRARED-EMISSION SPECTROSCOPY SO ENERGY & FUELS LA English DT Article; Proceedings Paper CT 7TH ANNUAL TECHNICAL CONFERENCE OF THE ADVANCED COMBUSTION ENGINEERING CENTER CY MAR 03-04, 1993 CL PARK CITY, UT SP BRIGHAM YOUNG UNIV, UNIV UTAH ID MINERALS AB In situ Fourier transform infrared (FTIR) emission spectroscopy is used to identify the presence of silica, sulfates, and silicates as a function of time in coal ash deposits generated in Sandia's multifuel combustor, a pilot-scale reactor. Ash deposits are formed on a cylindrical tube in cross flow under experimental conditions which correspond to convection pass (fouling) regions of a commercial coal-fired boiler. The gas temperature, gas composition, particle loading, and extent of particle reaction in the combustor are typical of commercial boiler operation. The major classes of inorganic species deposited on the tube, including silicates and sulfates, are identified using the FTIR emission spectroscopy technique. Post mortem X-ray diffraction and conventional infrared absorption and reflectance analyses on the same deposits are used to corroborate the in situ FTIR emission data. The deposit composition from a western coal changes significantly as a function of both deposition time and combustion conditions. The observed changes include formation of sulfates and silicates. Such changes have implications for deposit properties such as tenacity and strength; the FTIR emission diagnostic shows promise as a method for monitoring such changes in practical systems. C1 BRIGHAM YOUNG UNIV,ADV COMBUST ENGN RES CTR,PROVO,UT 84602. RP BAXTER, LL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. RI Baxter, Larry/C-8567-2009 OI Baxter, Larry/0000-0002-0453-2659 NR 18 TC 16 Z9 17 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 1993 VL 7 IS 6 BP 755 EP 760 DI 10.1021/ef00042a009 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MJ578 UT WOS:A1993MJ57800009 ER PT J AU MCMURTRY, PA MENON, S KERSTEIN, AR AF MCMURTRY, PA MENON, S KERSTEIN, AR TI LINEAR EDDY MODELING OF TURBULENT COMBUSTION SO ENERGY & FUELS LA English DT Article; Proceedings Paper CT 7TH ANNUAL TECHNICAL CONFERENCE OF THE ADVANCED COMBUSTION ENGINEERING CENTER CY MAR 03-04, 1993 CL PARK CITY, UT SP BRIGHAM YOUNG UNIV, UNIV UTAH ID TRANSPORT; FLAMES AB The use of the linear eddy mixing model in application to reacting flows is discussed for several different combustion geometries. The unique feature of this model is the explicit distinction made among the various physical processes (convection, diffusion, and reaction) at all scales of the flow. This is achieved by resolving all relevant scales of motion through a reduced, one-dimensional statistical description of the scalar field in a linear domain. The advantages of this modeling approach over other conventional modeling approaches are pointed out. Applications to both ''stand-alone' formulations and subgrid formulations for use in large eddy simulation (LES) are discussed. C1 GEORGIA INST TECHNOL,DEPT AEROSP ENGN,ATLANTA,GA 30332. SANDIA NATL LABS,LIVERMORE,CA 94551. RP MCMURTRY, PA (reprint author), UNIV UTAH,DEPT MECH ENGN,SALT LAKE CITY,UT 84112, USA. NR 21 TC 29 Z9 30 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 1993 VL 7 IS 6 BP 817 EP 826 DI 10.1021/ef00042a018 PG 10 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MJ578 UT WOS:A1993MJ57800018 ER PT J AU FAULON, JL CARLSON, GA HATCHER, PG AF FAULON, JL CARLSON, GA HATCHER, PG TI STATISTICAL-MODELS FOR BITUMINOUS COAL - A 3-DIMENSIONAL EVALUATION OF STRUCTURAL AND PHYSICAL-PROPERTIES BASED ON COMPUTER-GENERATED STRUCTURES SO ENERGY & FUELS LA English DT Article ID STRUCTURE ELUCIDATION; MACROMOLECULES AB Any coal structural model is at best an average representation. Even within a single maceral and rank there are numerous possible models. We have recently developed a computer technique which determines the number of different models which can be constructed from a set of analytical structural data. In the present work, the technique is applied to vitrinite from high-volatile C (HvC) bituminous coal. The number of possible vitrinite models is too large to build all of them and too large to select one as representative of all the possibilities. However, we use sampling theory to define an optimal set of models (a sample) which is an accurate representation of the entire population of possible models. Physical characteristics such as the potential energy, the helium density, and the microporosity are then calculated for the sample of vitrinite models, extrapolated to the whole population, and compared with the corresponding experimentally-determined data. C1 SANDIA NATL LABS,DEPT FUEL SCI,ALBUQUERQUE,NM 87185. RP FAULON, JL (reprint author), PENN STATE UNIV,FUEL SCI PROGRAM,UNIV PK,PA 16802, USA. NR 39 TC 31 Z9 34 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 1993 VL 7 IS 6 BP 1062 EP 1072 DI 10.1021/ef00042a052 PG 11 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MJ578 UT WOS:A1993MJ57800052 ER PT J AU MITRAKIRTLEY, S MULLINS, OC BRANTHAVER, JF CRAMER, SP AF MITRAKIRTLEY, S MULLINS, OC BRANTHAVER, JF CRAMER, SP TI NITROGEN CHEMISTRY OF KEROGENS AND BITUMENS FROM X-RAY-ABSORPTION NEAR-EDGE STRUCTURE SPECTROSCOPY SO ENERGY & FUELS LA English DT Article ID PETROLEUM ASPHALTENES; MOLECULAR-STRUCTURE; ORGANIC SULFUR; COAL; FORMS AB X-ray absorption near-edge structure (XANES) spectroscopy studies have been conducted on several different kerogens and bitumens to identify all the different nitrogen chemical structures present. Virtually all of the nitrogen is present in aromatic forms; pyrroles are the most dominant type, followed by pyridines, pyridones, and aromatic amines. A considerable amount of porphyrinic nitrogen, characterized by significant spectral effects, is found in one of the bitumens. The pyridone fraction in the kerogens and bitumens is much larger than in petroleum asphaltenes, suggesting that petroleum generation is accompanied by the loss of pyridone, possibly by conversion to pyridines. Differences are found between the kerogens and bitumens from the same source rock, indicating that bitumen analysis cannot substitute for kerogen analysis at least for nitrogen chemistry. There is no qualitative difference in the types of nitrogen compounds between kerogens produced by HCl or HF digestion. C1 SCHLUMBERGER DOLL RES CTR,RIDGEFIELD,CT 06877. ROSE HULMAN INST TECHNOL,TERRE HAUTE,IN 47803. WESTERN RES INST,LARAMIE,WY 82071. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 23 TC 26 Z9 27 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 1993 VL 7 IS 6 BP 1128 EP 1134 DI 10.1021/ef00042a062 PG 7 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MJ578 UT WOS:A1993MJ57800062 ER PT J AU MEYERS, S GOLDMAN, N MARTIN, N FRIEDMAN, R AF MEYERS, S GOLDMAN, N MARTIN, N FRIEDMAN, R TI PROSPECTS FOR THE POWER SECTOR IN 9 DEVELOPING-COUNTRIES SO ENERGY POLICY LA English DT Article DE ENERGY; ELECTRICITY; DEVELOPING COUNTRIES AB Based on information drawn primarily from official planning documents issued by national governments and/or utilities, this article examines the outlook for the power sector in the year 2000 in nine countries: China, India, Indonesia, Thailand, the Philippines, South Korea, Taiwan, Argentina and Mexico. This study found that the implicit rates of average annual growth of installed electric power capacity between 1991 and 2001 range from a low of 3.3% per year in Argentina to a high of 13.2% per year in Indonesia. In absolute terms, China and India account for the vast majority of the growth. The plan calls for a shift in the generating mix towards coat in six of the countries, and continued strong reliance on coal in China and India. The use of natural gas is expected to increase substantially in a number of the countries. The historic movement away from oil continues, although some countries are maintaining dual fuel capabilities. Plans call for considerable growth of nuclear power in South Korea and China and modest increases in India and Taiwan. The feasibility of the official plans varies among the countries. Lack of public capital is leading towards greater reliance on private sector participation in power projects in many Of the countries. Environmental issues are becoming a more significant constraint than in the past, particularly in the case of large-scale hydropower projects. The financial and environmental constraints are leading to a rising interest in methods of improving the efficiency of electricity supply and end use. The scale of such activities is growing in most of the study countries. RP MEYERS, S (reprint author), LAWRENCE BERKELEY LAB,INT ENERGY STUDIES GRP,ENERGY ANAL PROGRAM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 16 TC 10 Z9 10 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD NOV PY 1993 VL 21 IS 11 BP 1123 EP 1132 DI 10.1016/0301-4215(93)90262-E PG 10 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA MJ236 UT WOS:A1993MJ23600007 ER PT J AU JONES, DW ONEILL, RV AF JONES, DW ONEILL, RV TI A MODEL OF NEOTROPICAL LAND-USE WITH ENDOGENOUS MALARIA AND PREVENTIVE ECOLOGICAL MEASURES SO ENVIRONMENT AND PLANNING A LA English DT Article AB Malaria is a serious problem limiting agricultural colonization in the neotropics, especially in the Brazilian Amazon. We analyze a model that links the disease with deforestation and ecological measures to control the mosquito. In the model the probability of contracting malaria increases with population density, which is a principal endogenous variable in land-use decisions. A higher incidence of malaria reduces labor productivity. Farmers maximize profit by allocating labor between cultivation and health activities that reduce the incidence and severity of malaria. Commodity price changes, transportation improvements, and land clearance costs all affect the prevalence of malaria, and health and labor productivity. A reduction in land clearance costs will improve health and labor productivity but will exacerbate deforestation. An increase in the commodity price and a reduction in transportation costs exacerbate deforestation but reduce the prevalence of malaria, although the resultant change in the equilibrium levels of health and labor productivity is ambiguous. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP JONES, DW (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 17 TC 2 Z9 2 U1 0 U2 1 PU PION LTD PI LONDON PA 207 BRONDESBURY PARK, LONDON, ENGLAND NW2 5JN SN 0308-518X J9 ENVIRON PLANN A JI Environ. Plan. A PD NOV PY 1993 VL 25 IS 11 BP 1677 EP 1687 DI 10.1068/a251677 PG 11 WC Environmental Studies; Geography SC Environmental Sciences & Ecology; Geography GA MK374 UT WOS:A1993MK37400010 ER PT J AU KORTE, N KEARL, P AF KORTE, N KEARL, P TI SHOULD RESTORATION OF SMALL WESTERN WATERSHEDS BE PUBLIC-POLICY IN THE UNITED-STATES SO ENVIRONMENTAL MANAGEMENT LA English DT Article DE WATERSHED RESTORATION; ECONOMIC AND POLICY ANALYSIS ID COLORADO RIVER BASIN; ECONOMIC VALUE; RIPARIAN; BENEFITS; QUALITY; CHANNEL; FLOW AB Additional research is needed to determine whether restoration of degraded watersheds in the western United States should become large-scale public policy. Numerous small projects have demonstrated that vegetation can be restored, sediment losses halted, and, in some cases, formerly ephemeral streams made perennial. But if all watersheds in a basin were restored, what would be the overall effects both ecologically and economically? For example, if large-scale restoration of small watersheds were conducted in a western river basin, what would be the effects on water yield and quality for the basin as a whole? Would implementing basin-wide watershed restoration be cost-effective? A means of examining this question is to monitor a watershed prior to and during the restoration process and to compare the results to a control watershed. The watersheds would be instrumented such that the ecological processes and water balance could be monitored both instream and within the associated groundwater system. Overall effects would then be subjected to economic and policy analysis, and modeling would be used to extrapolate the new information over the entire basin. These results would then be available to political leaders and government agencies for determining whether large-scale watershed restoration should be public policy. RP KORTE, N (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,GRAND JUNCT OFF,GRAND JCT,CO 81503, USA. NR 32 TC 2 Z9 2 U1 1 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0364-152X J9 ENVIRON MANAGE JI Environ. Manage. PD NOV-DEC PY 1993 VL 17 IS 6 BP 729 EP 734 DI 10.1007/BF02393893 PG 6 WC Environmental Sciences SC Environmental Sciences & Ecology GA MA405 UT WOS:A1993MA40500002 ER PT J AU MARLEY, NA GAFFNEY, JS ORLANDINI, KA CUNNINGHAM, MM AF MARLEY, NA GAFFNEY, JS ORLANDINI, KA CUNNINGHAM, MM TI EVIDENCE FOR RADIONUCLIDE TRANSPORT AND MOBILIZATION IN A SHALLOW, SANDY AQUIFER SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID HUMIC-ACID; BEHAVIOR AB Evidence is reported for the movement of plutonium, americium, thorium, and radium in a shallow, sandy aquifer after the forced injection of colloidal and macromolecular natural organic materials (humic and fulvic acids). Ultrafiltration was used to size-fractionate the materials smaller than 0.45 mum in the injection water. Characterization of these organic materials showed the most mobile to be primarily fulvic acids with a high carboxylate content. Fallout-derived plutonium and americium in the injected materials were transported in the aquifer with the smaller organic fractions. Americium was shown to move from the less mobile colloidal materials to the smaller more mobile fulvics during transport. Thorium, uranium, and radium levels all increased upon injection of the organics into the aquifer, demonstrating the ability of low molecular weight, high carboxylic content fulvic acids to dissolve and mobilize radionuclides from the aquifer's mineral matrices. This effect also increased with decreasing flow rate in the aquifer. The implications of these observations for the interactions of low-level radioactive waste with natural organics are discussed. RP MARLEY, NA (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,BLDG 203,ARGONNE,IL 60439, USA. NR 31 TC 53 Z9 54 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD NOV PY 1993 VL 27 IS 12 BP 2456 EP 2461 DI 10.1021/es00048a022 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA ME578 UT WOS:A1993ME57800036 ER PT J AU SIMONEIT, BRT ROGGE, WF MAZUREK, MA STANDLEY, LJ HILDEMANN, LM CASS, GR AF SIMONEIT, BRT ROGGE, WF MAZUREK, MA STANDLEY, LJ HILDEMANN, LM CASS, GR TI LIGNIN PYROLYSIS PRODUCTS, LIGNANS, AND RESIN ACIDS AS SPECIFIC TRACERS OF PLANT CLASSES IN EMISSIONS FROM BIOMASS COMBUSTION SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID RESOLUTION GAS-CHROMATOGRAPHY; POLYCYCLIC AROMATIC-HYDROCARBONS; WESTERN UNITED-STATES; FINE ORGANIC AEROSOL; WOOD SMOKE; MASS-SPECTROMETRY; MOLECULAR MARKER; METHOXYLATED PHENOLS; URBAN SOURCES; MATTER AB Biomass smoke aerosols contain thermally unaltered and partially altered biomarker compounds from major vegetation taxa. These compounds range from C-8 to C31 and include phytosterols, lignans, phenolic products from lignin, and diterpenoids from resins. Certain of the higher molecular weight biomarkers are vaporized from the parent plant material and subsequently condense unaltered into the particle phase. Other compounds undergo pyrolytic alteration and possibly dimerization. In both cases it is possible to assign many of these compounds to the plant taxa of the unburned fuel. The diterpenoids are good indicators for smoke from burning of gymnosperm wood. The relative distribution of the OH/OCH3 substituent patterns on the phenolic products indicates the plant class of the biomass that was burned. Application of these relationships to the interpretation of ambient smoke aerosols may permit further evaluation of the sources that contribute to regional biomass burning. C1 CALTECH,DEPT ENVIRONM ENGN SCI,PASADENA,CA 91125. CALTECH,ENVIRONM QUAL LAB,PASADENA,CA 91125. BROOKHAVEN NATL LAB,DIV ENVIRONM CHEM,UPTON,NY 11973. ACAD NAT SCI,STROUD WATER RES CTR,AVONDALE,PA 19311. STANFORD UNIV,DEPT CIVIL ENGN,STANFORD,CA 94305. RP SIMONEIT, BRT (reprint author), OREGON STATE UNIV,COLL OCEAN & ATMOSPHER SCI,ENVIRONM GEOCHEM GRP,CORVALLIS,OR 97331, USA. RI SIMONEIT, BERND/A-2008-2013 NR 79 TC 241 Z9 245 U1 3 U2 66 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD NOV PY 1993 VL 27 IS 12 BP 2533 EP 2541 DI 10.1021/es00048a034 PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA ME578 UT WOS:A1993ME57800048 ER PT J AU VOGT, T SCHMAHL, WW AF VOGT, T SCHMAHL, WW TI THE HIGH-TEMPERATURE PHASE-TRANSITION IN PEROVSKITE SO EUROPHYSICS LETTERS LA English DT Article ID MGSIO3 PEROVSKITE; NEUTRON-DIFFRACTION; CRYSTAL-CHEMISTRY; LOWER MANTLE; DYNAMICS AB Perovskite (CaTiO3) is a model compound for the Earth's most abundant mineral, the perovskite (Mg, Fe)SiO3. High-temperature structural investigations using neutron powder diffraction reveal a phase transition to a highly disordered cubic phase. As one approaches this transition, the TiO6 octahedra become less distorted and their rotational disorder is reflected by the large atomic-displacement parameters of the oxygens in the (a, b)-plane, suggesting that the high-temperature transition to the cubic phase could be triggered by the onset of mobility in the oxygen sublattice. This would account for the fact that no intermediate tetragonal phase is observed. C1 TH DARMSTADT,FACHBEREICH MAT WISSENSCH,W-6100 DARMSTADT,GERMANY. RP VOGT, T (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Vogt, Thomas /A-1562-2011; Schmahl, Wolfgang/J-7571-2012 OI Vogt, Thomas /0000-0002-4731-2787; Schmahl, Wolfgang/0000-0002-0165-5952 NR 27 TC 35 Z9 36 U1 2 U2 10 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 NOV 1 PY 1993 VL 24 IS 4 BP 281 EP 285 DI 10.1209/0295-5075/24/4/008 PG 5 WC Physics, Multidisciplinary SC Physics GA MF951 UT WOS:A1993MF95100008 ER PT J AU HENRY, MA NOILES, EE GAO, DY MAZUR, P CRITSER, JK AF HENRY, MA NOILES, EE GAO, DY MAZUR, P CRITSER, JK TI CRYOPRESERVATION OF HUMAN SPERMATOZOA .4. THE EFFECTS OF COOLING RATE AND WARMING RATE ON THE MAINTENANCE OF MOTILITY, PLASMA-MEMBRANE INTEGRITY, AND MITOCHONDRIAL-FUNCTION SO FERTILITY AND STERILITY LA English DT Article DE HUMAN SPERMATOZOA; CRYOPRESERVATION; COOLING; WARMING ID INTRACELLULAR ICE FORMATION; MOUSE EMBRYOS; FROZEN; VIABILITY; SURVIVAL; CELLS; OVA AB Objective: To test the hypotheses that there is a two-factor aspect of cellular damage during cryopreservation that occurs in human sperm (osmotic effects versus intracellular ice formation) and that there is a cooling rate by warming rate interaction related to this damage. Design: Ejaculates from healthy men were cooled at 0.1, 1.0, 10, 175, or 800-degrees-C/min to -80-degrees-C in a solution of 0.85 M glycerol and plunged into liquid nitrogen. Samples were warmed at 400-degrees-C/min (experiment 1) or either 1-degrees-C or 400-degrees-C/min (experiment 2). After warming, sperm were assessed for survival using motility as the endpoint in experiment 1 and motility, plasma membrane integrity, and mitochondrial function in experiment 2. Results: In experiment 1, over the various cooling rates with a standard 400-degrees-C/min warming rate, a plot of motility versus cooling rate produced a classical inverted U-shaped curve (n = 6) with maximum motility at the 10-degrees-C/min cooling rate. In experiment 2, over the various cooling rates, both 1 and 400-degrees-C/min warming rates produced similar but shifted plots of motility, plasma membrane integrity, and mitochondrial function versus cooling rate, which also produced inverted-U-shaped patterns (n = 11). Maximal survival for each of the three endpoints occurred at 10-degrees-C/min cooling rate for the rapidly warmed sperm and at 1-degrees-C/min for the slowly warmed sperm. Conclusions: These data support the hypotheses that a two-factor hypothesis of cryodamage applies to human spermatozoa and that an interaction exists between cooling rate and warming rate. These data also suggest that motility, plasma membrane integrity, and mitochondrial function are not differently affected by cooling and warming during cryopreservation. C1 METHODIST HOSP INDIANA INC,CRYOBIOL RES INST,1701 N SENATE BLVD,INDIANAPOLIS,IN 46206. METHODIST HOSP INDIANA,DEPT OBSTET & GYNECOL,INDIANAPOLIS,IN 46202. INDIANA UNIV,SCH MED,DEPT PHYSIOL & BIOPHYS,INDIANAPOLIS,IN 46202. INDIANA UNIV,SCH MED,DEPT OBSTET & GYNECOL,INDIANAPOLIS,IN 46202. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. FU NICHD NIH HHS [K04-HD00980, R01-HD25949] NR 25 TC 96 Z9 100 U1 0 U2 8 PU AMER SOC REPRODUCTIVE MEDICINE PI BIRMINGHAM PA 1209 MONTGOMERY HIGHWAY, BIRMINGHAM, AL 35216-2809 SN 0015-0282 J9 FERTIL STERIL JI Fertil. Steril. PD NOV PY 1993 VL 60 IS 5 BP 911 EP 918 PG 8 WC Obstetrics & Gynecology; Reproductive Biology SC Obstetrics & Gynecology; Reproductive Biology GA ME311 UT WOS:A1993ME31100029 PM 8224279 ER PT J AU VANDENBERG, JJM LANSBERG, MG COOK, NE TRIBBLE, DL AF VANDENBERG, JJM LANSBERG, MG COOK, NE TRIBBLE, DL TI LDL LIPID OXIDATION AND PHOSPHOLIPASE-A(2) ACTIVITY IN ATHEROGENESIS - NOVEL ANALYTICAL APPROACHES SO FREE RADICAL BIOLOGY AND MEDICINE LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CHILDRENS HOSP OAKLAND,RES INST,OAKLAND,CA 94609. NR 0 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 0891-5849 J9 FREE RADICAL BIO MED JI Free Radic. Biol. Med. PD NOV PY 1993 VL 15 IS 5 BP 484 EP 484 DI 10.1016/0891-5849(93)90237-O PG 1 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA MD267 UT WOS:A1993MD26700052 ER PT J AU MAGUIRE, JJ MARCOCCI, L ALLEN, D HUNT, T PACKER, L RYDER, M AF MAGUIRE, JJ MARCOCCI, L ALLEN, D HUNT, T PACKER, L RYDER, M TI NITRIC-OXIDE SYNTHETASE-ACTIVITY IN RAT AND HUMAN NEUTROPHILS SO FREE RADICAL BIOLOGY AND MEDICINE LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DEPT MOLEC & CELLULAR BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT SURG,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DIV PERIODONTOL,SAN FRANCISCO,CA 94143. NR 0 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 0891-5849 J9 FREE RADICAL BIO MED JI Free Radic. Biol. Med. PD NOV PY 1993 VL 15 IS 5 BP 498 EP 498 DI 10.1016/0891-5849(93)90288-6 PG 1 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA MD267 UT WOS:A1993MD26700104 ER PT J AU TRIBBLE, DL LANSBERG, MG KRAUSS, RM KUYPERS, FA VANDENBERG, JJM AF TRIBBLE, DL LANSBERG, MG KRAUSS, RM KUYPERS, FA VANDENBERG, JJM TI COMPARTMENTALIZATION OF OXIDATIVE INJURY IN LOW-DENSITY LIPOPROTEINS (LDL) - EVIDENCE FOR 2 KINETIC POOLS CORRESPONDING TO THE LDL SURFACE MONOLAYER AND HYDROPHOBIC CORE SO FREE RADICAL BIOLOGY AND MEDICINE LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DEPT MOLEC & NUCL MED,BERKELEY,CA 94720. CHILDRENS HOSP OAKLAND,RES INST,OAKLAND,CA 94609. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0891-5849 J9 FREE RADICAL BIO MED JI Free Radic. Biol. Med. PD NOV PY 1993 VL 15 IS 5 BP 540 EP 540 DI 10.1016/0891-5849(93)90445-Z PG 1 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA MD267 UT WOS:A1993MD26700261 ER PT J AU ALLEN, DB MARCOCCI, L SCHEUENSTUHL, H MAHDAVIAN, M PACKER, L MAGUIRE, JJ HUNT, TK AF ALLEN, DB MARCOCCI, L SCHEUENSTUHL, H MAHDAVIAN, M PACKER, L MAGUIRE, JJ HUNT, TK TI CHARACTERISTICS OF THE RESPIRATORY BURST OF HUMAN NEUTROPHILS AT LOW-OXYGEN TENSIONS SO FREE RADICAL BIOLOGY AND MEDICINE LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,DEPT SURG,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,DEPT MOLEC & CELLULAR BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0891-5849 J9 FREE RADICAL BIO MED JI Free Radic. Biol. Med. PD NOV PY 1993 VL 15 IS 5 BP 553 EP 553 DI 10.1016/0891-5849(93)90493-E PG 1 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA MD267 UT WOS:A1993MD26700308 ER PT J AU NORTON, GA PETERS, RE AF NORTON, GA PETERS, RE TI ELIMINATION OF THE PRECIPITATE DIGESTION STEP IN THE GRAVIMETRIC-DETERMINATION OF SULFATE SULFUR IN COAL SO FUEL LA English DT Letter RP NORTON, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD NOV PY 1993 VL 72 IS 11 BP 1573 EP 1574 DI 10.1016/0016-2361(93)90019-X PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MD305 UT WOS:A1993MD30500019 ER PT J AU FARNUM, EH AF FARNUM, EH TI SUMMARY OF UNITED-STATES-JAPAN WORKSHOP ON DYNAMIC EFFECTS OF IRRADIATION IN CERAMICS, SANTA-FE, NEW-MEXICO, NOVEMBER 11-14, 1992 SO FUSION TECHNOLOGY LA English DT Editorial Material RP FARNUM, EH (reprint author), LOS ALAMOS NATL LAB,MS E546,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1993 VL 24 IS 3 BP 340 EP 341 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ME115 UT WOS:A1993ME11500013 ER PT J AU SMOOT, GF STEINHARDT, PJ AF SMOOT, GF STEINHARDT, PJ TI GRAVITY RAINBOW SO GENERAL RELATIVITY AND GRAVITATION LA English DT Article ID INFLATIONARY UNIVERSE SCENARIO; DENSITY PERTURBATIONS; BACKGROUND ANISOTROPY; GRAVITATIONAL-WAVES; EXTENDED INFLATION; COBE; FLATNESS; HORIZON AB The temperature anisotropy of the cosmic microwave background may be partially the imprint left by gravitational waves. Measuring the gravitational wave component and spectral shape of the anisotropy is a critical test of inflationary cosmology and theories of large-scale structure formation. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP SMOOT, GF (reprint author), LAWRENCE BERKELEY LAB,SPACE SCI LAB,BERKELEY,CA 94720, USA. NR 23 TC 10 Z9 10 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0001-7701 J9 GEN RELAT GRAVIT JI Gen. Relativ. Gravit. PD NOV PY 1993 VL 25 IS 11 BP 1095 EP 1100 DI 10.1007/BF00763752 PG 6 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME586 UT WOS:A1993ME58600001 ER PT J AU ZHU, YW CANTOR, CR SMITH, CL AF ZHU, YW CANTOR, CR SMITH, CL TI DNA-SEQUENCE ANALYSIS OF HUMAN-CHROMOSOME-21 NOTI LINKING CLONES SO GENOMICS LA English DT Article ID HUMAN GENOME; CPG ISLANDS; GENE MARKERS; PROMOTER; IDENTIFICATION; CONSTRUCTION; LIBRARY; YEAST C1 LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 FU NCI NIH HHS [CA39782] NR 36 TC 9 Z9 9 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 NOV PY 1993 VL 18 IS 2 BP 199 EP 205 DI 10.1006/geno.1993.1455 PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA MG993 UT WOS:A1993MG99300004 PM 8288220 ER PT J AU LYN, D DEAVEN, LL ISTOCK, NL SMULSON, M AF LYN, D DEAVEN, LL ISTOCK, NL SMULSON, M TI THE POLYMORPHIC ADP-RIBOSYLTRANSFERASE (NAD(+)) PSEUDOGENE-1 IN HUMANS INTERRUPTS AN ENDOGENOUS POL-LIKE ELEMENT ON 13Q34 SO GENOMICS LA English DT Article ID ALU FAMILY; POLY(ADP-RIBOSE) POLYMERASE; NUCLEOTIDE-SEQUENCE; HUMAN DNA; GENE; IDENTIFICATION; RETROVIRUSES C1 GEORGETOWN UNIV,SCH MED,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,DIV LIFE SCI,LOS ALAMOS,NM 87545. FU NCI NIH HHS [CA 13195] NR 27 TC 10 Z9 10 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 NOV PY 1993 VL 18 IS 2 BP 206 EP 211 DI 10.1006/geno.1993.1456 PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA MG993 UT WOS:A1993MG99300005 PM 7904581 ER PT J AU FALTA, RW PRUESS, K CHESNUT, DA AF FALTA, RW PRUESS, K CHESNUT, DA TI MODELING ADVECTIVE CONTAMINANT TRANSPORT DURING SOIL VAPOR EXTRACTION SO GROUND WATER LA English DT Article ID DENSE ORGANIC VAPORS; UNSATURATED ZONE; DISPERSIVE TRANSPORT; FLOW; GAS; HYDROCARBONS; SUBSURFACE; DESIGN AB A general semianalytical method for modeling the advective transport of a volatile organic compound (VOC) to a soil vapor extraction well has been developed. Assuming that the VOC is not present in the form of a nonaqueous phase liquid (NAPL), this technique is applicable to cases in which the VOC is partitioned in the unsaturated zone between the gas, aqueous, and solid phases. The VOC may have a one-, two-, or three-dimensional initial distribution. The method may be applied to problems having a one- or two-dimensional steady-state gas flow field in which the gas streamfunction and gas travel time distributions are known. Examples are included to show the application of the method to radial and two-dimensional cylindrical gas flow fields with different VOC distributions and characteristics. C1 LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP FALTA, RW (reprint author), CLEMSON UNIV,DEPT EARTH SCI,CLEMSON,SC 29634, USA. NR 27 TC 14 Z9 18 U1 0 U2 2 PU GROUND WATER PUBLISHING CO PI WESTERVILLE PA 601 DEMPSEY RD, WESTERVILLE, OH 43081 SN 0017-467X J9 GROUND WATER JI Ground Water PD NOV-DEC PY 1993 VL 31 IS 6 BP 1011 EP 1020 DI 10.1111/j.1745-6584.1993.tb00875.x PG 10 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA MF850 UT WOS:A1993MF85000017 ER PT J AU ROWLAND, RE AF ROWLAND, RE TI LOW-LEVEL RADIUM RETENTION BY THE HUMAN-BODY - A MODIFICATION OF THE ICRP PUBLICATION-20 RETENTION EQUATION SO HEALTH PHYSICS LA English DT Article DE RADIUM; DOSE, INTERNAL; DOSIMETRY; RADIATION EFFECTS AB Recently published rates of elimination of radium (in percentage of contemporary body content per year) demonstrated that human radium cases with low body contents lost radium more rapidly than predicted by the ICRP Publication 20 retention equation. In ICRP Publication 20, the apposition and resorption rate in compact bone is defined as 2.5% y-1, but in the derivation of the retention equation for radium a value of only 1.5% y-1 was used. In the present work, the retention equation was reevaluated by using the rate of 2.5% y-1. The revised equation was a good fit to the data for measured values of the body content of radium from environmental levels of radium in food and water. The equation also described the observed rate of loss of radium at long times after deposition for radium cases with low measured body burdens. RP ROWLAND, RE (reprint author), ARGONNE NATL LAB, DIV ENVIRONM RES, ARGONNE, IL 60439 USA. NR 15 TC 13 Z9 13 U1 0 U2 2 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1993 VL 65 IS 5 BP 507 EP 513 DI 10.1097/00004032-199311000-00006 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA ME861 UT WOS:A1993ME86100011 PM 8225987 ER PT J AU BIHL, DE BUSCHBOM, RL SULA, MJ AF BIHL, DE BUSCHBOM, RL SULA, MJ TI EXPERIENCE WITH A ROUTINE FECAL SAMPLING PROGRAM FOR PLUTONIUM WORKERS SO HEALTH PHYSICS LA English DT Article DE DOSIMETRY, INTERNAL; BIOASSAY; PLUTONIUM; EXCRETION, FECAL AB A quarterly fecal sampling program was conducted at the U. S. Department of Energy's Hanford site for congruent-to 100 workers at risk for an intake of plutonium oxide and other forms of plutonium. To our surprise, we discovered that essentially all of the workers were excreting detectable activities of plutonium. Further investigation showed that the source was frequent, intermittent intakes at levels below detectability by normal workplace monitoring, indicating the extraordinary sensitivity of fecal sampling. However, the experience of this study also indicated that the increased sensitivity of routine fecal sampling relative to more common bioassay methods is offset by many problems. These include poor worker cooperation; difficulty in distinguishing low-level chronic intakes from a more significant, acute intake; difficulty in eliminating interference from ingested plutonium; and difficulty in interpreting what a single void means in terms of 24-h excretion. Recommendations for a routine fecal program include providing good communication to workers and management about reasons and logistics of fecal sampling prior to starting, using annual (instead of quarterly) fecal sampling for class Y plutonium, collecting samples after workers have been away from plutonium exposure for a least 3 d, and giving serious consideration to improving urinalysis sensitivity rather than going to routine fecal sampling. RP BIHL, DE (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1993 VL 65 IS 5 BP 550 EP 555 DI 10.1097/00004032-199311000-00015 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA ME861 UT WOS:A1993ME86100020 PM 8225996 ER PT J AU HAALAND, CM AF HAALAND, CM TI DECAY OF GAMMA-RADIATION IN FALLOUT FOLLOWING A NUCLEAR-WAR SO HEALTH PHYSICS LA English DT Letter RP HAALAND, CM (reprint author), OAK RIDGE NATL LAB, DIV ENGN PHYS & MATH, OAK RIDGE, TN 37831 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1993 VL 65 IS 5 BP 561 EP 562 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA ME861 UT WOS:A1993ME86100023 PM 8225999 ER PT J AU SHAPIRO, CS HARVEY, T AF SHAPIRO, CS HARVEY, T TI DECAY OF GAMMA-RADIATION IN FALLOUT FOLLOWING A NUCLEAR-WAR - RESPONSE SO HEALTH PHYSICS LA English DT Letter C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RP SHAPIRO, CS (reprint author), SAN FRANCISCO STATE UNIV, LIVERMORE, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1993 VL 65 IS 5 BP 562 EP 562 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA ME861 UT WOS:A1993ME86100024 ER PT J AU ZHAO, J WANG, A TAOUK, M WENHAM, SR GREEN, MA KING, DL AF ZHAO, J WANG, A TAOUK, M WENHAM, SR GREEN, MA KING, DL TI 20-PERCENT EFFICIENT PHOTOVOLTAIC MODULE SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID SOLAR-CELLS AB This paper describes the first 20% efficient flat-plate photovoltaic module ever reported. The 743-cm2 module is based on large-area PERL silicon cells (passivated emitter rear locally diffused) of average unencapsulated efficiency of 21.3%, giving an independently confirmed module energy conversion efficiency of 20.6% under standard test conditions. The module also shows a very low temperature coefficient of performance increasing its performance advantage over standard silicon modules at increased temperature. Also reported is an independently confirmed efficiency of 21.6% for a 46 cm2 cell of the type used in the module, the highest efficiency ever reported for a cell of this size. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ZHAO, J (reprint author), UNIV NEW S WALES,CTR PHOTOVOLTA DEVICES & SYST,KENSINGTON,NSW 2033,AUSTRALIA. NR 14 TC 9 Z9 9 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD NOV PY 1993 VL 14 IS 11 BP 539 EP 541 DI 10.1109/55.258008 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA MF783 UT WOS:A1993MF78300011 ER PT J AU PAXTON, AH SCHAUS, CF SRINIVASAN, ST AF PAXTON, AH SCHAUS, CF SRINIVASAN, ST TI SEMICONDUCTOR-LASER WITH REGROWN-LENS-TRAIN UNSTABLE RESONATOR - THEORY AND DESIGN SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID REFRACTIVE-INDEX; HIGH-POWER; OPERATION AB We derive the geometrical optical properties of the fundamental mode of the unstable resonator consisting of a train of weak cylindrical lenses and obtain expressions for the effective distributed loss and the increase in threshold current due to the beam expansion. These properties are the same as for the continuous unstable resonator with a quadratic lateral variation of the index of refraction, to a very good approximation. The wave aberration introduced by passage through the lenses and through the output facet is not severe for stripe widths up to 170 mu m. We discuss our rationale for selecting a specific transverse structure for the regrown-lens-train (RLT) laser and present the results of calculations of the waveguide modes and values of the effective index of refraction. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. EYEON CORP,TUALATIN,OR 97072. UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. RP PAXTON, AH (reprint author), USAF,PHILLIPS LAB,KIRTLAND AFB,NM 87117, USA. NR 27 TC 12 Z9 12 U1 2 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD NOV PY 1993 VL 29 IS 11 BP 2784 EP 2792 DI 10.1109/3.248937 PG 9 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MQ441 UT WOS:A1993MQ44100010 ER PT J AU SCHEPS, R MYERS, JF PAYNE, SA AF SCHEPS, R MYERS, JF PAYNE, SA TI END-PUMPED YB-DOPED FLUORAPATITE LASER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB An ytterbium:fluorapatite (Yb:FAP) laser crystal is longitudinally prumped using a Ti:sapphire laser emitting at 905 nn. The highest slope efficiency obtained was 60.5%, and the maximum output power was 214 mW with a pump power of 438 mW. Repetitive Q-switching ass demonstrated for the first time. The Q-switched average power was identical to the continuous wave (CW) power at repetition rates exceeding 20 kHz, as is consistent with the 1.08-ms emission lifetime. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SCHEPS, R (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,SAN DIEGO,CA 92152, USA. NR 8 TC 9 Z9 9 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD NOV PY 1993 VL 5 IS 11 BP 1285 EP 1288 DI 10.1109/68.250045 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MN042 UT WOS:A1993MN04200009 ER PT J AU RAMBO, PW DENAVIT, J AF RAMBO, PW DENAVIT, J TI TIME STABILITY OF MONTE-CARLO DEVICE SIMULATION SO IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS LA English DT Article ID TRANSPORT AB An important numerical constraint on self consistent Monte Carlo device simulation is the stability limit on the time step imposed by plasma oscillations. The widely quoted stability limit for the time step between Poisson field solutions, DELTAt < 2/omega(p) where omega(p) is the plasma frequency, is specific to the leapfrog particle advance used in collisionless plasma simulation and does not apply to typical particle advance schemes used for device simulation. We derive a stability criterion applicable to several algorithms in use for solid state modeling; this criterion is verified with numerical simulation. This work clarifies the time step limitation due to plasma oscillations and provides a useful guide for the efficient choice of time step size in Monte Carlo simulation. RP RAMBO, PW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 12 TC 21 Z9 21 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0278-0070 J9 IEEE T COMPUT AID D JI IEEE Trans. Comput-Aided Des. Integr. Circuits Syst. PD NOV PY 1993 VL 12 IS 11 BP 1734 EP 1741 DI 10.1109/43.248084 PG 8 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA ML089 UT WOS:A1993ML08900012 ER PT J AU LOTT, JA SCHNEIDER, RP MOLLY, KJ AF LOTT, JA SCHNEIDER, RP MOLLY, KJ TI VISIBLE (639 NM LESS-THAN-OR-EQUAL-TO-LAMBDA-LESS-THAN-OR-EQUAL-TO-661 NM) VERTICAL-CAVITY SURFACE-EMITTING LASER-DIODES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Meeting Abstract C1 SANDIA NATL LABS,COMPOUND SEMICOND RES LAB,ALBUQUERQUE,NM 87185. NR 2 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD NOV PY 1993 VL 40 IS 11 BP 2115 EP 2116 DI 10.1109/16.239763 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA ME783 UT WOS:A1993ME78300062 ER PT J AU LEAR, KS CHALMERS, SA AF LEAR, KS CHALMERS, SA TI HIGH WALLPLUG EFFICIENCY VERTICAL-CAVITY TOP-SURFACE-EMITTING LASER-DIODES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Meeting Abstract C1 SANDIA NATL LABS,PHOTON RES DEPT,ALBUQUERQUE,NM 87185. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD NOV PY 1993 VL 40 IS 11 BP 2116 EP 2116 DI 10.1109/16.239788 PG 1 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA ME783 UT WOS:A1993ME78300063 ER PT J AU CHOQUETTE, KD LEAR, KL LEIBENGUTH, RE ASOM, MT AF CHOQUETTE, KD LEAR, KL LEIBENGUTH, RE ASOM, MT TI VERTICAL-CAVITY LASER-DIODE POLARIZATION SWITCHING AND CONTROL SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Meeting Abstract ID GAAS C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD NOV PY 1993 VL 40 IS 11 BP 2117 EP 2118 DI 10.1109/16.239791 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA ME783 UT WOS:A1993ME78300066 ER PT J AU CHEN, ZJ JILES, DC AF CHEN, ZJ JILES, DC TI MODELING OF REVERSIBLE DOMAIN-WALL MOTION UNDER THE ACTION OF MAGNETIC-FIELD AND LOCALIZED DEFECTS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC AB This paper presents a simple physical model of the action of point defects on domain wall bowing in the low field region. A relationship between initial permeability and defect density is derived. Experimental results on the relation between initial permeability and carbon content in spheroidised iron carbon specimens are presented and the results are discussed in connection with this model. RP CHEN, ZJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 5 TC 4 Z9 4 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 2554 EP 2556 DI 10.1109/20.280956 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ945 UT WOS:A1993MQ94500066 ER PT J AU MULCAHY, TM HE, JL ROTE, DM ROSSING, TD AF MULCAHY, TM HE, JL ROTE, DM ROSSING, TD TI FORCES ON A MAGNET MOVING PAST FIGURE-8 COILS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC AB The lift, drag, and guidance forces acting on a permanent magnet are measured as different arrays of figure-eight (null-flux) coils pass under the magnet. The experimental results are in good agreement with the predictions of dynamic circuit theory, which can be used to investigate other coll arrays. C1 ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP MULCAHY, TM (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 2947 EP 2949 DI 10.1109/20.280908 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ945 UT WOS:A1993MQ94500189 ER PT J AU HE, JL ROTE, DM AF HE, JL ROTE, DM TI DOUBLE-ROW LOOP-COIL CONFIGURATION FOR EDS MAGLEV SUSPENSION, GUIDANCE, AND ELECTROMAGNETIC GUIDEWAY DIRECTIONAL SWITCHING SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC AB This paper discusses a new suspension and guidance configuration for a high-speed, electrodynamic suspension (EDS) maglev system. The configuration can also be used to develop an electromagnetic guideway directional switch. The performance of the system is predicted using the dynamic circuit model. General expressions of the magnetic forces based on the harmonic approximation are obtained. The principle of the electromagnetic guideway directional switch for the EDS maglev system is discussed. RP HE, JL (reprint author), ARGONNE NATL LAB,CTR TRANSPORTAT RES,DIV ENERGY SYST,9700 CASS AVE,ARGONNE,IL 60439, USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 2956 EP 2958 DI 10.1109/20.280905 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ945 UT WOS:A1993MQ94500192 ER PT J AU CHEN, ZJ STROM, A JILES, DC AF CHEN, ZJ STROM, A JILES, DC TI MICROMAGNETIC SURFACE MEASUREMENTS FOR EVALUATION OF SURFACE MODIFICATIONS DUE TO CYCLIC STRESS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC ID MAGNETIC-PROPERTIES AB Results of inspection fatigue damage by two magnetic non-destructive methods are presented. The magnetic hysteresis method can detect fatigue damage in the later stages of fatigue fife. Magnetic Barkhausen signals, being highly sensitive to the surface condition of a material, show a continuous change during the whole fatigue process. Barkhausen effect measurement, aided by signal processing techniques, is therefore capable of monitoring surface modifications due to cyclic stress. C1 IOWA STATE UNIV SCI & TECHNOL,CTR NDE,AMES,IA 50011. RP CHEN, ZJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 9 TC 8 Z9 8 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 3031 EP 3033 DI 10.1109/20.281109 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ945 UT WOS:A1993MQ94500217 ER PT J AU JILES, DC AF JILES, DC TI FREQUENCY-DEPENDENCE OF HYSTERESIS CURVES IN NONCONDUCTING MAGNETIC-MATERIALS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC AB The problem of modelling the frequency dependence of hysteresis in magnetic materials is approached in a new way. The de magnetization curve, or hysteresis loop, is assumed to be the equilibrium position for the bulk magnetization. All microscopic processes which occur under the action of a time-varying field can be averaged to give a time dependent displacement from equilibrium, Delta M. In this paper, we examine the case where eddy current effects do not play a significant role, that is to say the model applies to ''non-conducting'' media. It is shown that Delta M obeys a damped simple harmonic motion equation. This means that the time dependence of the displacement magnetization Delta M is the Laplace transform of the field waveform. This enables the time dependence of the magnetization to be modelled, once the de hysteresis carve is known, with only two additional materials parameters of relaxation time and natural frequency. The model emerges as a natural extension of the theory of hysteresis. RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 8 TC 47 Z9 49 U1 0 U2 15 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 3490 EP 3492 DI 10.1109/20.281206 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ946 UT WOS:A1993MQ94600058 ER PT J AU HE, JL ROTE, DM COFFEY, HT AF HE, JL ROTE, DM COFFEY, HT TI APPLICATIONS OF THE DYNAMIC CIRCUIT-THEORY TO MAGLEV SUSPENSION SYSTEMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article ID LAUNCHERS AB This paper discusses the applications of dynamic circuit theory to electrodynamic suspension EDS systems. In particular, the paper focuses on the loop-shaped coil and the figure-eight-shaped null-flux coil suspension systems. Mathematical models, including very general force expressions that can be used for the development of computer codes, are provided for each of these suspension systems. General applications and advantages of the dynamic circuit model are summarized. The paper emphasizes the transient and dynamic analysis and computer simulation of maglev systems. In general, the method discussed here can be applied to many EDS maglev design concepts. It is also suited for the computation of the performance of maglev propulsion systems. Numerical examples are presented in the paper to demonstrate the capability of the model. RP HE, JL (reprint author), ARGONNE NATL LAB,CTR TRANSPORTAT RES,DIV ENERGY SYST,ARGONNE,IL 60439, USA. NR 18 TC 15 Z9 16 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 4153 EP 4164 PN 3 PG 12 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MR902 UT WOS:A1993MR90200003 ER PT J AU BALDICK, R KAHN, E AF BALDICK, R KAHN, E TI TRANSMISSION PLANNING ISSUES IN A COMPETITIVE ECONOMIC-ENVIRONMENT SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article; Proceedings Paper CT IEEE/PES 1993 Winter Meeting CY JAN 31-FEB 05, 1993 CL COLUMBUS, OH SP IEEE, POWER ENGN SOC DE TRANSMISSION PLANNING; COMPETITION; ECONOMIES OF SCALE ID IMPACT AB In the increasingly competitive electric utility industry, there is an emerging need for the diverse parties using the transmission system to understand transmission planning. In this pager, we discuss features of transmission planning that are problematic in such an environment. Reference is made to a number of recent transmission system expansion and access disputes. Transmission software models are also discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,UTIL POLICY & PLANNING GRP,BERKELEY,CA 94720. NR 17 TC 29 Z9 31 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD NOV PY 1993 VL 8 IS 4 BP 1497 EP 1503 DI 10.1109/59.260951 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA ML448 UT WOS:A1993ML44800015 ER PT J AU SILVA, LJ BRAY, LA MATSON, DW AF SILVA, LJ BRAY, LA MATSON, DW TI CATALYZED ELECTROCHEMICAL DISSOLUTION FOR SPENT CATALYST RECOVERY SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID METALS AB Increasing concern for pollution prevention and waste disposal has created a need for clean alternatives for spent catalyst recovery or disposal. A new technique uses catalyzed electrochemical dissolution to oxidize and subsequently dissolve typical catalyst metals and metal contaminants so that they may be isolated and reclaimed. Hydrocarbons and carbonaceous materials adhered to the catalyst surface are oxidized to carbon dioxide and water at moderate temperatures and ambient pressure. Sulfides are converted to aqueous sulfur species. Supercritical fluid extraction is an optional pretreatment step to remove hydrocarbons adhered to the catalyst. The technique described here offers advantages over conventional spent catalyst reclamation processes. In this paper, recovery of a spent hydrodesulfurization catalyst is described. RP SILVA, LJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 9 TC 9 Z9 9 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD NOV PY 1993 VL 32 IS 11 BP 2485 EP 2489 DI 10.1021/ie00023a007 PG 5 WC Engineering, Chemical SC Engineering GA MF917 UT WOS:A1993MF91700007 ER PT J AU SOLOMON, AD ALEXIADES, V JACOBS, GK AF SOLOMON, AD ALEXIADES, V JACOBS, GK TI HEAT-TRANSFER ANALYSIS OF A FIELD-SCALE MELTING EXPERIMENT SO INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER LA English DT Article AB Heat transfer analysis was used to evaluate conceptual models of processes associated with In Situ Vitrification (ISV). ISV is a phase-change process used to melt contaminated soil sites into more stable configurations for environmental restoration. Using data from a field-scale ISV test we develop relations that allow us to estimate the temperature of the melt from voltage and amperage measurements. The calculated temperatures are in excellent agreement with measured values. A global heat balance calculation is used to account for heats of several processes that occur as soil is heated up and melted during ISV. This analysis yields an efficiency of 33% for the ISV process. Most of the heat is lost from the surface of the melt, and heat transfer concepts confirm that radiative heat transfer is the dominant process. C1 UNIV TENNESSEE,DEPT MATH,KNOXVILLE,TN 37996. RP SOLOMON, AD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0735-1933 J9 INT COMMUN HEAT MASS JI Int. Commun. Heat Mass Transf. PD NOV-DEC PY 1993 VL 20 IS 6 BP 793 EP 801 DI 10.1016/0735-1933(93)90033-R PG 9 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA MH390 UT WOS:A1993MH39000004 ER PT J AU MEI, Z MORRIS, JW AF MEI, Z MORRIS, JW TI STRESS-CONCENTRATION DUE TO A HEMISPHERICAL SURFACE INCLUSION SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article AB Fatigue cracks often initiate at surface inclusions, and sometimes appear at inclusions within the bulk. To clarify the relative efficiency of these crack sources, an approximate solution for the elastic stress of a hemispherical surface inclusion is provided and compared with the existing result of a spherical interior inclusion. The approximate solution is obtained from the Eshelby solution for the elastic field of an ellipsoid inclusion by introducing the Green's function of an elastic half-space. The numerical calculated results indicate that the stress concentration of a surface inclusion is higher when the inclusion is harder than the matrix, while that of an embedded inclusion is higher when the inclusion is softer than the matrix. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP MEI, Z (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 8 TC 4 Z9 4 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0376-9429 J9 INT J FRACTURE JI Int. J. Fract. PD NOV 1 PY 1993 VL 64 IS 1 BP 43 EP 61 DI 10.1007/BF00019624 PG 19 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA MV197 UT WOS:A1993MV19700003 ER PT J AU BAUER, TH AF BAUER, TH TI A GENERAL ANALYTICAL APPROACH TOWARD THE THERMAL-CONDUCTIVITY OF POROUS-MEDIA SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article AB A general analytical approach to the thermal conductivity of porous media is developed which leads to theoretically sound expressions having a wide range of applicability and easily fitted to available empirical data. Specifically, practical expressions are derived for pore distributions of any concentration, randomly oriented pores of arbitrary shape, pores of any conductivity, radiant heal transfer within pores, and fibrous media. Most results transfer freely to electrical conductivity or any other general area where Laplace's equation applies. Fundamental limitations of the approach restrict its use to random pore distributions and heat transfer through the continuous medium by conduction. Examples are chosen from selected problem areas of current interest, spanning a wide range of pore types, volume fractions, and conductivities. RP BAUER, TH (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 14 TC 114 Z9 121 U1 0 U2 18 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD NOV PY 1993 VL 36 IS 17 BP 4181 EP 4191 DI 10.1016/0017-9310(93)90080-P PG 11 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA ME614 UT WOS:A1993ME61400012 ER PT J AU MILLER, GK AF MILLER, GK TI CALCULATION OF IMPACT LOADS FOR HIGH-ENERGY DROPS OF CYLINDRICAL CONTAINERS SO INTERNATIONAL JOURNAL OF IMPACT ENGINEERING LA English DT Article AB The regulatory criteria for containers that are used to transport radioactive materials require that the container maintain structural integrity for an accidental drop of up to 30 ft onto a non-yielding surface. Storage containers for radioactive materials are also designed for accidental drops, usually of lesser heights. The design of these containers generally requires a determination of the peak magnitude of the impact force acting on the container. This paper presents an analytical solution that can be used to estimate the primary impact forces for cylindrical containers. Equations are derived for essentially all drop orientations. RP MILLER, GK (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83401, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0734-743X J9 INT J IMPACT ENG JI Int. J. Impact Eng. PD NOV PY 1993 VL 13 IS 4 BP 511 EP 526 DI 10.1016/0734-743X(93)90083-J PG 16 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA LK919 UT WOS:A1993LK91900001 ER PT J AU CHAKRABARTI, S DEMAREST, KR MILLER, EK AF CHAKRABARTI, S DEMAREST, KR MILLER, EK TI AN EXTENDED FREQUENCY-DOMAIN PRONY METHOD FOR TRANSFER-FUNCTION PARAMETER-ESTIMATION SO INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS LA English DT Article ID TARGET DISCRIMINATION; EXTRACTION; POLE AB The estimation of transfer-function parameters, such as poles and zeros, is useful for characterizing and identifying electromagnetic scatterers. The conventional frequency-domain Prony's technique can estimate these parameters from sampled, frequency-domain data. However, it fails to estimate the true parameters when the sampled data contains contributions from out-of-band poles. In this paper, an extended frequency-domain Prony's technique is developed that circumvents this problem by adding polynomial terms to the standard, Prony pole series. This new technique is shown to be very effective for estimating the poles of transfer functions over very wide bandwidths, without the need for large numbers of simultaneous equations, even when the data are corrupted by noise. C1 LOS ALAMOS NATL LAB,INSTRUMENTAT GRP,LOS ALAMOS,NM 87545. RP CHAKRABARTI, S (reprint author), UNIV KANSAS,DEPT ELECT & COMP ENGN,1013 LEARNED HALL,LAWRENCE,KS 66045, USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0894-3370 J9 INT J NUMER MODEL EL JI Int. J. Numer. Model.-Electron. Netw. Device Fields PD NOV PY 1993 VL 6 IS 4 BP 269 EP 281 DI 10.1002/jnm.1660060404 PG 13 WC Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA MZ279 UT WOS:A1993MZ27900003 ER PT J AU FISCHER, SK AF FISCHER, SK TI TOTAL EQUIVALENT WARMING IMPACT - A MEASURE OF THE GLOBAL WARMING IMPACT OF CFC ALTERNATIVES IN REFRIGERATING EQUIPMENT SO INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID LA English DT Article DE SUBSTITUTE; GREENHOUSE EFFECT; MEASUREMENT AB Chlorofluorocarbons (CFCs) are important components of refrigeration equipment, plastic for insulation for buildings and appliances, and solvent cleaning processes. The Montreal Protocol to Protect Stratospheric Ozone Layer and recent revisions to the protocol require a rapid phase-out of the production and use of CFCs and a transition to alternative materials and technologies. It is important that the alternative technologies selected do not exacerbate the global warming problem while attempting to preserve stratospheric ozone. A study was conducted to evaluate the total global warming impact of proposed alternatives to CFCs and this paper focuses on the aspects of that study relevant to refrigeration and air-conditioning. The concept of total equivalent warming impact (TEWI) is developed as a measure of the combined global warming impacts of the refrigerant losses to the atmosphere and the CO2 emissions from fossil fuels to generate power to run the refrigeration and air-conditioning systems. Equipment using alternatives to CFCs has lower TEWIs than current systems in almost all cases, with dramatic reductions possible in some applications. RP FISCHER, SK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 6 TC 10 Z9 10 U1 2 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0140-7007 J9 INT J REFRIG JI Int. J. Refrig.-Rev. Int. Froid PD NOV PY 1993 VL 16 IS 6 BP 423 EP 428 DI 10.1016/0140-7007(93)90059-H PG 6 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MD016 UT WOS:A1993MD01600005 ER PT J AU AMUSIA, MY AF AMUSIA, MY TI REACTIONS (GAMMA,2E) AND (E,3E) AS PROBES OF ELECTRONIC CORRELATIONS IN ATOMS SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT International Symposium on (e, 2e) Collisions, Double Photoionization and Related Processes - (e, 2e) 93, Official Satellite of the 18th ICPEAC CY JUL 15-17, 1993 CL PARIS, FRANCE SP EUROPEAN PHYS SOC ID DOUBLE-PHOTOIONIZATION; HELIUM; IONIZATION; THRESHOLD; ENERGIES; SINGLE AB Cross sections of the (gamma,2e) and (e,3e) reactions carry information on two vacancy energy spectrum and on electron pair correlations in initial and final states of the target atom. Physical pictures of these processes are presented for two- and many-electron atoms. Simplest mechanisms of them are discussed, demonstrating some features which are waiting for experimental confirmation. Attention is given to high photon energy and even to relativistic energy region of these reactions. The energy distribution of outgoing relativistic electrons is qualitatively different from what it is for the nonrelativistic case. Origin and types of corrections to the simplest mechanisms and possible means of their detection are discussed. Role of different resonances: shape, giant, autoionizational, and Feschbach-type are considered. Results of calculations are compared with experimental data, mainly on double photoionization cross sections. Different possible objects as targets for the reactions are mentioned, including negative ions, excited atoms, molecules and clusters. Modification of the type of these reactions due to rather probable emission of the photon is discussed. Future of the domain is outlined. C1 AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA. RP AMUSIA, MY (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Amusia, Miron/K-7726-2014 NR 27 TC 2 Z9 2 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD NOV PY 1993 VL 3 IS C6 BP 91 EP 106 DI 10.1051/jp4:1993609 PG 16 WC Physics, Multidisciplinary SC Physics GA MR571 UT WOS:A1993MR57100010 ER PT J AU BERRAH, N HEISER, F WEHLITZ, R LEVIN, J WHITFIELD, SB VIEFHAUS, J SELLIN, IA BECKER, U AF BERRAH, N HEISER, F WEHLITZ, R LEVIN, J WHITFIELD, SB VIEFHAUS, J SELLIN, IA BECKER, U TI ENERGY-DEPENDENCE OF DOUBLE PHOTOIONIZATION IN HE SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT International Symposium on (e, 2e) Collisions, Double Photoionization and Related Processes - (e, 2e) 93, Official Satellite of the 18th ICPEAC CY JUL 15-17, 1993 CL PARIS, FRANCE SP EUROPEAN PHYS SOC ID DOUBLE-IONIZATION; RARE-GASES; HELIUM; THRESHOLD; IMPACT; NE AB The ratio of double-to-single ionization of He has been measured between 280 eV and 1210 eV to investigate its energy dependence in the intermediate region. The new intermediate energy measurement, compared with the most recent theories of Pan and Kelly and of Hino and Hino et al., show the importance of including not only ground state but also final state correlations. They also appear to indicate the importance of including higher-order effects in the theory. The previously reported [11, 22] high energy measurements between 2-12 keV give a ratio of 1.5 (2)% in good agreement with older shake calculations of Byron and Joachain and of Aberg, as well as with recent many-body perturbation theory of Ishihara et al., calculations of Dalgarno and Sadeghpour, and of Andersson and Burgdorfer. In contrast to the intermediate energy behavior, consideration of final state correlations proves inessential as discussed by Dalgarno and Sadeghpour. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. W MICHIGAN UNIV,DEPT PHYS,KALAMAZOO,MI 49009. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37891. RP BERRAH, N (reprint author), MAX PLANCK GESELL,FRITZ HABER INST,BERLIN,GERMANY. RI Becker, Uwe/A-6604-2013 NR 28 TC 1 Z9 1 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD NOV PY 1993 VL 3 IS C6 BP 197 EP 205 DI 10.1051/jp4:1993619 PG 9 WC Physics, Multidisciplinary SC Physics GA MR571 UT WOS:A1993MR57100020 ER PT J AU TOMSIA, AP AF TOMSIA, AP TI CERAMIC/METAL JOINING FOR STRUCTURES AND MATERIALS SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd European Conference on Advanced Materials and Processes CY JUN 08-10, 1993 CL PARIS, FRANCE SP ASSOC AERONAUT & ASTRONAUT FRANCE, ASSOC MAT COMPOSITES, SOC FRANCAISE PHYS, SOC FRANCAISE MICROSCOPIC ELECTR, GRP FRANCAISE CERAM, GRP FRANCAISE POLYM, EUROPEAN ASSOC COMPOSITE MAT, EUROPEAN CERAM SOC, EUROPEAN POLYM FEDERAT, SOC FRANCAISE MET & MAT, FEDERAT EUROPEAN MAT SOC ID THEORETICAL-MODEL; NITRIDE AB The paper presents a discussion of the various types of ceramic joining within a conceptual framework based on the fundamentals of wetting, adhesion, and the thermodynamics of interfacial reactions. Examples are given of solid state diffusion bonding of Pt to alumina and brazing of ALN. Most ceramic-metal bonding is conducted at high temperatures, where chemical reaction is to be expected. The way in which bond strength is affected by chemical reaction at ceramic-metal interfaces is also discussed. RP TOMSIA, AP (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,MS 62-203,BERKELEY,CA 94720, USA. NR 30 TC 20 Z9 20 U1 1 U2 5 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD NOV PY 1993 VL 3 IS C7 BP 1317 EP 1326 DI 10.1051/jp4:19937203 PN 2 PG 10 WC Physics, Multidisciplinary SC Physics GA PF703 UT WOS:A1993PF70300076 ER PT J AU BELMONTE, M SANCHEZHERENCIA, AJ MORENO, R MIRANZO, P MOYA, JS TOMSIA, AP AF BELMONTE, M SANCHEZHERENCIA, AJ MORENO, R MIRANZO, P MOYA, JS TOMSIA, AP TI IN-SITU FORMATION OF CA(6) PLATELETS IN AL2O3 AND AL2O3/ZRO2 MATRICES SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd European Conference on Advanced Materials and Processes CY JUN 08-10, 1993 CL PARIS, FRANCE SP ASSOC AERONAUT & ASTRONAUT FRANCE, ASSOC MAT COMPOSITES, SOC FRANCAISE PHYS, SOC FRANCAISE MICROSCOPIC ELECTR, GRP FRANCAISE CERAM, GRP FRANCAISE POLYM, EUROPEAN ASSOC COMPOSITE MAT, EUROPEAN CERAM SOC, EUROPEAN POLYM FEDERAT, SOC FRANCAISE MET & MAT, FEDERAT EUROPEAN MAT SOC ID ALUMINA AB Al2O3 and Al2O3/ZrO2 compacts containing CaO as a dopant have been sintered under different conditions and atmospheres: air, high vacuum (> 10(.6)torr). SEM observations have been made on the polished surfaces of sintered and also of annealed samples. Only after the annealing treatment in air at temperatures ranging from 1400 degrees to 1500 degrees C, a massive formation of CA(6) platelets was detected in samples sintered in low oxygen partial pressure atmospheres. In order to clarify the mechanism of formation of this secondary phase at the grain boundaries, CaO has been introduced in the form of either plaster of Paris (to reproduce a possible contamination provided by the molds in slip casting) or CaCO3. The obtained results indicate the important role of the firing atmosphere on the precipitation of secondary phases at grain boundary. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BELMONTE, M (reprint author), CSIC,INST CERAM & VIDRIO,PLAZA MURILLO 2,MADRID,SPAIN. RI Moya, Jose/I-5841-2013; Sanchez-Herencia, Antonio Javier/D-1518-2011; Sanchez-Herencia, Antonio Javier/I-2110-2015; Miranzo, Pilar/H-1282-2015 OI Sanchez-Herencia, Antonio Javier/0000-0002-9982-4127; Sanchez-Herencia, Antonio Javier/0000-0003-2874-6640; NR 5 TC 1 Z9 1 U1 0 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD NOV PY 1993 VL 3 IS C7 BP 1443 EP 1447 DI 10.1051/jp4:19937224 PN 2 PG 5 WC Physics, Multidisciplinary SC Physics GA PF703 UT WOS:A1993PF70300097 ER PT J AU WHITEMAN, CD DORAN, JC AF WHITEMAN, CD DORAN, JC TI THE RELATIONSHIP BETWEEN OVERLYING SYNOPTIC-SCALE FLOWS AND WINDS WITHIN A VALLEY SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article AB The relationship between winds above and within the Tennessee Valley is investigated climatologically and with an atmospheric numerical model. For the climatological analyses, winds above the valley were determined by interpolation from four surrounding rawinsonde stations, while winds within the valley were measured on four 100-m towers. Tennessee Valley winds are generally weak and bidirectional, oriented along the valley's axis. The valley wind direction depends strongly on the component of the synoptic-scale pressure gradient that is superimposed along the valley's axis at ridge-top level, with winds blowing along the valley's axis from high toward low pressure. This relationship between winds above and within the valley can result in countercurrents similar to those observed in the Rhine Valley. While winds in the Tennessee Valley are driven primarily by this pressure-driven channeling mechanism, downward momentum transport can cause afternoon winds within the valley to approach the wind directions aloft when winds at ridge-top level are strong. and thermally driven valley circulations can appear at night when winds at ridge-top level are weak. A hydrostatic numerical model was used to provide additional insight into the physical processes governing the near-surface winds in the Tennessee Valley. The results support the identification of pressure-driven channeling, downward momentum transport, and thermal forcing as the principal mechanisms determining valley wind directions. They also illustrate the importance of topographical features in producing deviations from simple pressure-driven channeling. The relative importance of thermally driven and pressure-driven winds is examined, and guidelines are presented for estimating when one or the other process will dominate. m RP WHITEMAN, CD (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 13 TC 111 Z9 118 U1 0 U2 4 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD NOV PY 1993 VL 32 IS 11 BP 1669 EP 1682 DI 10.1175/1520-0450(1993)032<1669:TRBOSS>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MD727 UT WOS:A1993MD72700001 ER PT J AU GAO, W LI, BL AF GAO, W LI, BL TI WAVELET ANALYSIS OF COHERENT STRUCTURES AT THE ATMOSPHERE FOREST INTERFACE SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID TURBULENT BOUNDARY-LAYER; DECIDUOUS FOREST; FLOW; CANOPY; TEMPERATURE; VEGETATION; SMOOTH; MODEL; WALL AB Wavelet analysis was applied to turbulence data for temperature and vertical velocity within and above a deciduous forest. This method appears to provide an objective technique for examining thermal and flow fields associated with coherent structures occurring near the forest. The two-dimensional unfolding in time and scale by the wavelet transform illustrates discrete warm and cool centers associated with organized updrafts and downdrafts, which have similar patterns but different magnitudes at different heights. Wavelet variances computed for temperature and velocity at different heights appear to have local maximum values corresponding to certain time scales, which are self-consistent and useful for objective determination of the principal time scale of the structures. Within the canopy, the principal time scales of the structures determined by this technique are 56-60 s and 40-44 s for the temperature and vertical velocity fields, respectively. These time scales are close to those determined by the multilevel detection scheme used in a previous analysis. The temperature structures above the canopy have a shorter duration, but the rate of the decrease in the time scale with increasing height appears to be proportional to the increase in mean wind speed. The horizontal size of the structure determined by the product of local wind speed and the detected principal time scales is in the range of 83-112 m. The time scale of the structures identified in vertical velocity appears to be consistently smaller than that in the thermal field. The canopy structures show a smooth connection in the scale change with circulations of lower frequency (about 5-7 min) and merge into updrafts and downdrafts of these larger-scale circulations. C1 TEXAS A&M UNIV SYST,DEPT IND ENGN,CTR BIOSYST MODELLING,COLL STN,TX 77843. RP GAO, W (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,BLDG 203,RM J152,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 37 TC 109 Z9 121 U1 2 U2 8 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD NOV PY 1993 VL 32 IS 11 BP 1717 EP 1725 DI 10.1175/1520-0450(1993)032<1717:WAOCSA>2.0.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MD727 UT WOS:A1993MD72700005 ER PT J AU WISE, J KADYK, JA HESS, DW AF WISE, J KADYK, JA HESS, DW TI CHEMICAL-MODEL FOR WIRE CHAMBER AGING IN CF4/IC4H10 GASES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PLASMA POLYMERIZATION; CF4; CHEMISTRY; MIXTURES; HYDROCARBONS; DISCHARGES; METHANE; SILICON; TESTS; TUBES AB Aging of proportional counters in CF4/iC4H10 mixtures is studied as a function of gas composition. Anode surfaces are analyzed by Auger electron spectroscopy. Anode-wire deposits are formed from 95/5 and 90/10 mixtures of CF4/iC4H10; etching of deposits occurs in 50/50 and 80/20 mixtures of CF4/iC4H10 and in pure CF4. Gold-plated wires are resistant to aging resulting from chemical attack by CF4, but non-gold-plated wires are too reactive for use in CF4-containing gases. An apparent cathode aging process resulting in loss of gain rather than in a self-sustained discharge current is observed in CF4 and CF4-rich gases. Principles of low-pressure rf plasma chemistry are used to interpret the plasma chemistry in avalanches (greater-than-or-equal-to 1 atm, dc). To understand anode aging in CF4/iC4H10 gases, a four-part model is developed considering: (i) plasma polymerization of iC4H10; (ii) etching of wire deposits by CF4; (iii) deposition that occurs as a result of radical scavenging in strongly etching environments; and (iv) reactivity of the wire surface. Practical guidelines suggested by the model and application of the model to other fluorine-containing gases are discussed. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LEHIGH UNIV,DEPT CHEM ENGN,BETHLEHEM,PA 18015. NR 49 TC 9 Z9 10 U1 0 U2 0 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 NOV 1 PY 1993 VL 74 IS 9 BP 5327 EP 5340 DI 10.1063/1.354234 PG 14 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700006 ER PT J AU EVANS, D ROSOCHA, LA ANDERSON, GK COOGAN, JJ KUSHNER, MJ AF EVANS, D ROSOCHA, LA ANDERSON, GK COOGAN, JJ KUSHNER, MJ TI PLASMA REMEDIATION OF TRICHLOROETHYLENE IN SILENT DISCHARGE PLASMAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIELECTRIC-BARRIER DISCHARGES; FLUE-GAS; SO2; OXIDATION; MECHANISM; REMOVAL; LASERS AB Plasma destruction of toxins, and volatile organic compounds in particular, from gas streams is receiving increased attention as an energy efficient means to remediate those compounds. In this regard, remediation of trichloroethylene (TCE) in silent discharge plasmas has been experimentally and theoretically investigated. We found that TCE can be removed from Ar/O2 gas streams at atmospheric pressure with an energy efficiency of 15-20 ppm/(mJ/cm3), or 2-3 kW h kg-1. The majority of the Cl from TCE is converted to HCl, Cl2, and COCl2, which can be removed from the gas stream by a water bubbler. The destruction efficiency of TCE is smaller in humid mixtures compared to dry mixtures due to interception of reactive intermediates by OH radicals. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801. RI Kushner, Mark/A-7362-2008; Kushner, Mark/D-4547-2015 NR 23 TC 134 Z9 136 U1 2 U2 13 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 NOV 1 PY 1993 VL 74 IS 9 BP 5378 EP 5386 DI 10.1063/1.354241 PG 9 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700013 ER PT J AU NELSON, AJ SWARTZLANDER, AB TUTTLE, JR NOUFI, R PATEL, R HOCHST, H AF NELSON, AJ SWARTZLANDER, AB TUTTLE, JR NOUFI, R PATEL, R HOCHST, H TI PHOTOEMISSION INVESTIGATION OF THE ELECTRONIC-STRUCTURE AT POLYCRYSTALLINE CUINSE2 THIN-FILM INTERFACES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PHOTOVOLTAGE AB The surface versus bulk composition and electronic structure of polycrystalline CuInSe2 thin-film interfaces were studied by synchrotron radiation soft-x-ray photoemission spectroscopy. An n-type In2Se3/CuIn3Se5 surface layer forms on enhanced-grain polycrystalline thin-film p-type CuInSe2 during fabrication. Enhanced-grain CuInSe2 films were sputter etched (500 V Ar) and analyzed in situ to determine core-level binding energies and Fermi-level positions for the n-type surface and the p-type CuInSe2 bulk within +/- 0.1 eV. The transition between the n-type surface and the p-type bulk was experimentally observed by noting the change in the position of the valence-band maximum relative to the Fermi level E(F). From these measurements, the valence-band offset DELTAE(v) between the layers was determined to be 0.50 eV. Measurement of the work functions phi was also completed and reveals phi = 4.75 eV for the In2Se3 (CuIn3Se5) surface layer and phi = 4.04 eV for the bulk CuInSe2. Combining these results allows construction of a surface band diagram for this device configuration as well as determination of the relationship between composition, electronic structure, and device performance. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 11 TC 37 Z9 37 U1 1 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 NOV 1 PY 1993 VL 74 IS 9 BP 5757 EP 5760 DI 10.1063/1.354195 PG 4 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700072 ER PT J AU COLTRIN, ME DANDY, DS AF COLTRIN, ME DANDY, DS TI ANALYSIS OF DIAMOND GROWTH IN SUBATMOSPHERIC DC PLASMA-GUN REACTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; MONTE-CARLO SIMULATION; EPITAXIAL-GROWTH; DISCHARGE PLASMA; ACETYLENE TORCH; ROTATING-DISK; LOW-PRESSURE; FILM GROWTH; MECHANISM; SURFACE AB The growth of diamond in a subatmospheric dc-arc plasma-jet reactor has been studied theoretically. Full transport equations for this geometry, including gas-phase and surface chemistry, have been solved numerically. The surface-reaction mechanism includes pathways for the incorporation of CH3, C2H2, and C from the gas phase, as well as growth of graphite. The surface mechanism includes full reversibility for all reactions, based on estimates of the thermochemistry. Results are presented for degrees of dissociation of H2 in the plasma gun ranging from 2.6% to 90%, and inlet levels of CH4 spanning 0.1-5.0 mol %. It is seen that CH3 is the predominant growth species when there is little H-2 dissociation within the plasma gun, but C becomes the dominant species at higher dissociation levels. The third growth species, C2H2, does not play a role in diamond growth under these conditions when there is less than 1% CH4 in the feed; but, at higher CH4 levels both C and CH3 addition rates drop to 50 times greater than C2H2. C1 COLORADO STATE UNIV,DEPT CHEM ENGN,FT COLLINS,CO 80523. RP COLTRIN, ME (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Dandy, David/G-6984-2012 OI Dandy, David/0000-0003-3254-0717 NR 95 TC 129 Z9 130 U1 0 U2 16 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 NOV 1 PY 1993 VL 74 IS 9 BP 5803 EP 5820 DI 10.1063/1.354201 PG 18 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700079 ER PT J AU LAPIANOSMITH, DA HIMPSEL, FJ TERMINELLO, LJ AF LAPIANOSMITH, DA HIMPSEL, FJ TERMINELLO, LJ TI THE CHEMISORPTION AND REACTION OF DIETHYLSILANE ON SILICON-(100) AND SILICON-(111) SURFACES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ATOMIC LAYER EPITAXY; CHEMICAL VAPOR-DEPOSITION; CORE-LEVEL SPECTROSCOPY; SI(100); CARBIDE; DIAMOND; GROWTH; XPS; DECOMPOSITION; PHOTOEMISSION AB Soft x-ray photoemission has been utilized to investigate the chemisorption and subsequent reaction of diethylsilane on Si(111) and (100) surfaces. We show that diethylsilane chemisorbs dissociatively to form Si-CH2CH3 surface species on Si(111) and Si(100) at room temperature. These species are identified by two very sharp peaks observed in the valence band spectra of both surfaces, positioned at 17.9 and 14.3 eV binding energy. Si 2p and C 1s core level spectra were measured following exposures of Si(100) and (111) substrates as a function of surface temperature. C 1s data show that carbon, in some form, exists on the Si surface following exposures at every temperature from room temperature to about 600-degrees-C. While only -CH2CH3 ethyl groups are observed on the surface at room temperature, these species appear to partially dehydrogenate above 300-degrees-C producing a mixture of -CH2CH3 groups and other intermediate carbonaceous species. At a growth temperature of about 400-degrees-C for the technologically important (100) surface, the intermixing of elemental carbon with Si begins. At higher temperatures, we observe the continued degradation of diethylsilane to produce a Si + C alloy on the surface at 600-degrees-C. Our results indicate that diethylsilane has potential as a candidate for SiC formation by chemical vapor deposition techniques. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LAPIANOSMITH, DA (reprint author), IBM CORP,THOMAS J WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. NR 30 TC 13 Z9 13 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 NOV 1 PY 1993 VL 74 IS 9 BP 5842 EP 5849 DI 10.1063/1.354176 PG 8 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700083 ER PT J AU SANDOVAL, MJ BELL, AT AF SANDOVAL, MJ BELL, AT TI TEMPERATURE-PROGRAMMED DESORPTION STUDIES OF THE INTERACTIONS OF H2, CO, AND CO2 WITH CU/SIO2 SO JOURNAL OF CATALYSIS LA English DT Article ID SUPPORTED COPPER-CATALYSTS; CARBON-MONOXIDE; DISSOCIATIVE ADSORPTION; METHANOL SYNTHESIS; HYDROGEN ADSORPTION; METAL-SURFACES; CU(110); CU(100); CU; SPECTROSCOPY C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP SANDOVAL, MJ (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. OI Bell, Alexis/0000-0002-5738-4645 NR 67 TC 37 Z9 37 U1 0 U2 11 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD NOV PY 1993 VL 144 IS 1 BP 227 EP 237 DI 10.1006/jcat.1993.1326 PG 11 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA MC297 UT WOS:A1993MC29700019 ER PT J AU PRATT, ST DEHMER, PM DEHMER, JL AF PRATT, ST DEHMER, PM DEHMER, JL TI ZERO-KINETIC-ENERGY PHOTOELECTRON-SPECTROSCOPY FROM THE A(OVER-TILDE)(1)A(U) STATE OF ACETYLENE - RENNER-TELLER INTERACTIONS IN THE TRANS-BENDING VIBRATION OF C2H2+ X(OVER-TILDE) (2)PI(U) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID X BAND SYSTEM; MULTIPHOTON IONIZATION; RESONANCE SPECTROSCOPY; ROTATION CONSTANTS; DIATOMIC-MOLECULES; ELECTRONIC STATES; WAVELENGTH BANDS; SELECTION-RULES; UV SPECTRUM; PHOTOIONIZATION AB Double-resonance excitation via the A 1A(u) state is used to record zero-kinetic-energy photoelectron spectra of acetylene. The analysis of these spectra leads to an improved value of 91 952 +/- 2 cm-1 for the adiabatic ionization potential to the C2H2+ X 2PI(u) ionic ground state. Because the A 1A(u) intermediate state has a trans-bent geometry, transitions from it readily populate the trans-bending vibration of the ground state ion, leading to new information about this mode and its Renner-Teller interactions. The relative intensities of the Renner-Teller components and of the rotational structure within each component also provide information on the dynamics of the photoionization process. RP PRATT, ST (reprint author), ARGONNE NATL LAB, ARGONNE, IL 60439 USA. NR 49 TC 77 Z9 77 U1 2 U2 16 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 NOV 1 PY 1993 VL 99 IS 9 BP 6233 EP 6244 DI 10.1063/1.465888 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100001 ER PT J AU BONANG, CC ANDERSON, DJ CAMERON, SM KELLY, PB GETTY, JD AF BONANG, CC ANDERSON, DJ CAMERON, SM KELLY, PB GETTY, JD TI ULTRAVIOLET RAMAN-SCATTERING FROM SIMPLE ALCOHOLS AND A RELATED DIOL AS A STUDY OF LOW-LYING RYDBERG-VALENCE STATE CHARACTERISTICS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RESONANCE RAMAN; DEPENDENCE; WAVELENGTH; METHANOL; WATER; H2O+ AB Relative Raman scattering cross sections of totally symmetric vibrational modes of liquid methanol, ethanol, and ethylene glycol are measured as a function of excitation wavelength in the preresonant spectral region 37 593-47 393 cm-1. Raman spectra are also obtained with 50043 and 54 198 cm-1 excitation, the latter energy being directly resonant with the first excited state of the alcohols. The data indicate that the first three excited electronic states (with transition energies of approximately 54 600, 62 500, and 66 000 cm-1, respectively) make no significant contribution to the Raman scattered intensities and are nearly entirely Rydberg in character. The low-lying electronic structure of ethylene glycol appears to be primarily Rydberg in character as well. The dominant C-H and O-H stretching modes gain intensity largely from valence state(s) with transition energies near 70 000 cm-1, while the C-O stretching and CH2,3 bending modes gain intensity from even higher energy states (approximately 85 000 cm-1). C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. RP BONANG, CC (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 34 TC 14 Z9 15 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 NOV 1 PY 1993 VL 99 IS 9 BP 6245 EP 6252 DI 10.1063/1.465889 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100002 ER PT J AU BRADFORTH, SE ARNOLD, DW NEUMARK, DM MANOLOPOULOS, DE AF BRADFORTH, SE ARNOLD, DW NEUMARK, DM MANOLOPOULOS, DE TI EXPERIMENTAL AND THEORETICAL-STUDIES OF THE F+H-2 TRANSITION-STATE REGION VIA PHOTOELECTRON-SPECTROSCOPY OF FH2- SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POTENTIAL-ENERGY SURFACE; QUANTUM REACTIVE SCATTERING; THRESHOLD PHOTODETACHMENT SPECTROSCOPY; MECHANICAL REACTION PROBABILITIES; INCLUDING ELECTRON CORRELATION; HYDROGEN ABSTRACTION REACTIONS; F + D2; MOLECULAR-BEAM; CROSS-SECTIONS; TEMPERATURE-DEPENDENCE AB The transition state region of the F + H-2 reaction is studied by photoelectron spectroscopy of FH2-. The photoelectron spectra consist of overlapping electronic bands with different angular distributions. The ground state band shows partially resolved features which differ depending on whether the anion is made from normal or para hydrogen. This dependence on the anion nuclear spin statistics implies that these features are due to progressions in bending levels of the neutral FH2 complex. In order to confirm this, and to determine the sensitivity of the photoelectron spectrum to the bend potential near the F + H-2 transition state. three-dimensional simulations of the FH2- photoelectron spectrum were performed assuming various potential energy surfaces for the F + H-2 reaction. We found that the London-Eyring Polanyi-Sato surface proposed by Takayanagi and Sato gave better agreement than either the T5a or 5SEC surfaces. From the higher energy band, we can extract information on the F + H-2 excited electronic states, and several approximate simulations on model surfaces for these states are presented. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. UNIV NOTTINGHAM, DEPT CHEM, NOTTINGHAM NG7 2RD, ENGLAND. RI Bradforth, Stephen/B-5186-2008; Neumark, Daniel/B-9551-2009 OI Bradforth, Stephen/0000-0002-6164-3347; Neumark, Daniel/0000-0002-3762-9473 NR 92 TC 123 Z9 124 U1 1 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 NOV 1 PY 1993 VL 99 IS 9 BP 6345 EP 6359 DI 10.1063/1.465873 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100013 ER PT J AU MA, ZX LIAO, CL NG, CY MA, NL LI, WK AF MA, ZX LIAO, CL NG, CY MA, NL LI, WK TI ADIABATIC IONIZATION-ENERGY AND ELECTRON-AFFINITY OF CH2BR SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-ENERGIES; 2ND-ROW COMPOUNDS; PHOTOIONIZATION; RADICALS; CH3S+ AB The photoionization efficiency spectrum of supersonically cooled CH2Br has been measured near its ionization threshold. The adiabatic ionization energy (IE) of CH2Br is determined to be 8.61 +/- 0.01 eV, in excellent agreement with the value obtained previously using the He I photoelectron spectroscopic method. We have also performed Gaussian-2 (G2) calculations on CH2Br+, CH2Br, and CH2Br- which yield values of 8.47 and 0.97 eV for the IE and electron affinity of CH2Br, respectively. The G2 electron affinity is in accord with the literature value of 1.0 +/- 0.3 eV calculated from the acidity of CH3Br. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. CHINESE UNIV HONG KONG,DEPT CHEM,SHA TIN,HONG KONG. RP MA, ZX (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 26 TC 32 Z9 35 U1 1 U2 5 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 NOV 1 PY 1993 VL 99 IS 9 BP 6470 EP 6473 DI 10.1063/1.465864 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100027 ER PT J AU LUCAS, DJ CURTISS, LA POPLE, JA AF LUCAS, DJ CURTISS, LA POPLE, JA TI THEORETICAL-STUDY OF THE SILICON OXYGEN HYDRIDES SIOH(N) (N=0-4) AND SIOH(N)+ (N=0-5) - DISSOCIATION-ENERGIES, IONIZATION ENERGIES, ENTHALPIES OF FORMATION, AND PROTON AFFINITIES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID REIONIZATION MASS-SPECTROMETRY; CHEMICAL VAPOR-DEPOSITION; SILAFORMYL RADICAL HSIO; SINGLY BONDED SILICON; GAS-PHASE GENERATION; REACTION ERGODOGRAPHY; ABINITIO CALCULATION; MOLECULAR-STRUCTURE; AMORPHOUS-SILICON; GAUSSIAN-2 THEORY AB The energies of silicon-oxygen hydrides SiOH(n) (n = 0-4) and their cations SiOH(n)+ (n = 0.5) have been studied using Gaussian-2 (G2) theory. Atomization energies, enthalpies of formation, bond dissociation energies and ionization energies have been evaluated. There is little experimental thermochemical data available for these species, although many of them have i been detected. In silanol, the O-H bond dissociation energy is 119.3 kcal/mol and the first Si-H bond dissociation energy is 92.6 kcal/mol. The O-H bond is significantly stronger than the same bond in methanol (105.0 kcal/mol) and the S-H bond in methylmercapton (86.0 kcal/mol). The silicon-oxygen systems tend to show a preference for isomers containing O-H bonds as opposed to H-Si bonds because of the strong O-H bond. The G2 proton affinity of SiO (191.1 kcal/mol at 298 K) is in good agreement with a recently measured value (189.3 +/- 2.6 kcal/mol at 295 K). The G2 ionization energy of SiO is 11.58 eV, in agreement with the observed value (11.61 eV). from the vacuum ultraviolet photoelectron spectrum. C1 CARNEGIE MELLON UNIV,DEPT CHEM,PITTSBURGH,PA 15213. RP LUCAS, DJ (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 74 TC 43 Z9 43 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 NOV 1 PY 1993 VL 99 IS 9 BP 6697 EP 6703 DI 10.1063/1.465837 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100051 ER PT J AU DANG, LX SMITH, DE AF DANG, LX SMITH, DE TI MOLECULAR-DYNAMICS SIMULATIONS OF AQUEOUS IONIC CLUSTERS USING POLARIZABLE WATER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NEGATIVE-IONS; PHOTOELECTRON-SPECTROSCOPY; GAS-PHASE; SOLVATION; ANION; HYDRATION AB The solvation properties of a chlorine ion in small water clusters are investigated using state-of-the-art statistical mechanics. The simulations employ the polarizable water model developed recently by Dang [J. Chem. Phys. 97, 2659 (1992)]. The ion-water interaction potentials are defined such that the successive binding energies for the ionic clusters, and the solvation enthalpy, bulk vertical binding energy, and structural properties of the aqueous solution agree with the best available results obtained from experiments. Simulated vertical electron binding energies of the ionic clusters Cl-(H2O)n, (n = 1-6) are found to be in modest agreement with data from recent photoelectron spectroscopy experiments. Minimum energy configurations for the clusters as a function of ion polarizability are compared with the recent quantum chemical calculations of Combariza, Kestner, and Jortner [Chem. Phys. Lett. 203, 423 (1993)]. Equilibrium cluster configurations at 200 K are described in terms of surface and interior solvation states for the ion, and are found to be dependent on the magnitude of the Cl- polarizability assumed in the simulations. RP DANG, LX (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 32 TC 162 Z9 164 U1 2 U2 13 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 NOV 1 PY 1993 VL 99 IS 9 BP 6950 EP 6956 DI 10.1063/1.465441 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100079 ER PT J AU SILLER, L PALMER, RE WENDELKEN, JF AF SILLER, L PALMER, RE WENDELKEN, JF TI RESONANT EXCITATION OF LOW-FREQUENCY MODES IN ELECTRON-SCATTERING BY PHYSISORBED O2 ON PT(111) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ADSORBED MOLECULES; VIBRATIONAL-MODES; CO; ENERGY; SURFACES; NI(111) AB The lineshape of the v=0-1 vibrational mode in the high resolution electron energy loss spectrum of physisorbed O2 on Pt (111) shows discrete loss peaks attributed to a low frequency molecule-surface vibration and its overtones. The energy and angular dependence of these vibrations is consistent with the molecular negative ion resonance mechanism predicted by Gadzuk. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SILLER, L (reprint author), UNIV CAMBRIDGE,CAVENDISH LAB,MADINGLEY RD,CAMBRIDGE CB3 0HE,ENGLAND. RI Palmer, Richard/A-5366-2008 OI Palmer, Richard/0000-0001-8728-8083 NR 21 TC 7 Z9 7 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 NOV 1 PY 1993 VL 99 IS 9 BP 7175 EP 7178 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100099 ER PT J AU DATSKOS, PG CHRISTOPHOROU, LG CARTER, JG AF DATSKOS, PG CHRISTOPHOROU, LG CARTER, JG TI TEMPERATURE-ENHANCED ELECTRON DETACHMENT FROM C6F6- NEGATIVE-IONS (VOL 98, PG 7875, 1993) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Correction, Addition RP DATSKOS, PG (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,ATOM MOLEC & HIGH VOLTAGE PHYS GRP,POB 2008,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 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 NOV 1 PY 1993 VL 99 IS 9 BP 7279 EP 7279 DI 10.1063/1.466240 PG 1 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100114 ER PT J AU SUGAMA, T FAIR, JR REED, AP AF SUGAMA, T FAIR, JR REED, AP TI POLYMETALLOSILOXANE COATINGS DERIVED FROM 2-STEP, ACID-BASE CATALYZED SOL PRECURSORS FOR CORROSION PROTECTION OF ALUMINUM SUBSTRATES SO JOURNAL OF COATINGS TECHNOLOGY LA English DT Article ID INFRARED-SPECTRA; GLASSES; PYROLYSIS AB Fractal polymetallosiloxane (PMS) cluster films were fabricated on aluminum (Al) substrates by the hydrolysis-polycondensation-pyrolysis route of two-step, acid-base-catalyzed sol precursors consisting of N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole, metal alkoxides, water, and methyl alcohol. Thin PMS coating films prepared by dipping Al into sol solution provided significant protection for Al against NaCl-induced corrosion. The important factors governing a good protective performance of PMS were as follows: (1) an increase in metal-O-Si linkages with increased treatment temperature; (2) a low degree of water wettability and spreadability; and (3) a specific microstructure geometry, in which the cluster units consisting of symmetrically grown fractal polymer branches were linked together. The third factor contributed to a decrease in stress generated by the shrinkage of films, thereby eliminating crazing and peeling of the film. C1 RICE UNIV,DEPT CHEM,HOUSTON,TX 77252. LAS VEGAS HIGH SCH,LAS VEGAS,NV 89154. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 18 TC 10 Z9 10 U1 0 U2 2 PU FEDERATION SOC COATING TECH PI BLUE BELL PA 492 NORRISTOWN ROAD, BLUE BELL, PA 19422 SN 0361-8773 J9 J COATING TECHNOL JI J. Coat. Technol. PD NOV PY 1993 VL 65 IS 826 BP 27 EP 36 PG 10 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA MG323 UT WOS:A1993MG32300002 ER PT J AU CHEN, WYC AF CHEN, WYC TI COMPOSITIONAL CALCULUS SO JOURNAL OF COMBINATORIAL THEORY SERIES A LA English DT Article ID UMBRAL CALCULUS; LAGRANGE INVERSION; COMBINATORICS; VARIABLES; ALGEBRA; SERIES RP CHEN, WYC (reprint author), LOS ALAMOS NATL LAB,C-3,MAIL STOP B265,LOS ALAMOS,NM 87545, USA. NR 35 TC 6 Z9 6 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0097-3165 J9 J COMB THEORY A JI J. Comb. Theory Ser. A PD NOV PY 1993 VL 64 IS 2 BP 149 EP 188 DI 10.1016/0097-3165(93)90094-O PG 40 WC Mathematics SC Mathematics GA MG924 UT WOS:A1993MG92400001 ER PT J AU HANSMANN, UHE OKAMOTO, Y AF HANSMANN, UHE OKAMOTO, Y TI PREDICTION OF PEPTIDE CONFORMATION BY MULTICANONICAL ALGORITHM - NEW APPROACH TO THE MULTIPLE-MINIMA PROBLEM SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID SIMULATED ANNEALING METHOD; HYDROGEN-BOND INTERACTIONS; OCCURRING AMINO-ACIDS; ISOLATED C-PEPTIDE; PHASE-TRANSITIONS; CRYSTALLOGRAPHIC REFINEMENT; NONBONDED INTERACTIONS; ENERGY PARAMETERS; PROTEIN; POLYPEPTIDES AB We apply a recently developed method, the multicanonical algorithm, to the problem of tertiary structure prediction of peptides and proteins. As a simple example to test the effectiveness of the algorithm, metenkephalin is studied and the ergodicity problem, or multiple-minima problem, is shown to be overcome by this algorithm. The lowest-energy conformation obtained agrees with that determined by other efficient methods such as Monte Carlo simulated annealing. The superiority of the present method to simulated annealing lies in the fact that the relationship to the canonical ensemble remains exactly controlled. Once the multicanonical parameters are determined, only one simulation run is necessary to. obtain the lowest-energy conformation and further the results of this one run can be used to calculate various thermodynamic quantities at any temperature. The latter point is demonstrated by the calculation of the average potential energy and specific heat as functions of temperature. (C) 1993 by John Wiley & Sons, Inc. C1 FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP HANSMANN, UHE (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 42 TC 339 Z9 342 U1 0 U2 16 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD NOV PY 1993 VL 14 IS 11 BP 1333 EP 1338 DI 10.1002/jcc.540141110 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA MC646 UT WOS:A1993MC64600009 ER PT J AU MCGARRAH, DB JUDSON, RS AF MCGARRAH, DB JUDSON, RS TI ANALYSIS OF THE GENETIC ALGORITHM METHOD OF MOLECULAR-CONFORMATION DETERMINATION SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID CYCLIC-PEPTIDES; DYNAMICS; OPTIMIZATION; SIMULATION AB Many important problems in chemistry require knowledge of the 3-D conformation of a molecule. A commonly used computational approach is to search for a variety of low-energy conformations. Here, we study the behavior of the genetic algorithm (GA) method as a global search technique for finding these low-energy conformations. Our test molecule is cyclic hexaglycine. The goal of this study is to determine how to best utilize GAs to find low-energy populations of conformations given a fixed amount of CPU time. Two measures are presented that help monitor the improvement in the GA populations and their loss of diversity. Different hybrid methods that combine coarse GA global search with local gradient minimization are evaluated. We present several specific recommendations about trade-offs when choosing GA parameters such as population size, number of generations, rate of interaction between subpopulations, and combinations of GA and gradient minimization. In particular, our results illustrate why approaches that emphasize convergence of the GA can actually decrease its effectiveness as a global conformation search method. (C) 1993 by John Wiley & Sons, Inc. C1 SANDIA NATL LABS,CTR COMPUTAT ENGN 8117,LIVERMORE,CA 94551. OI Judson, Richard/0000-0002-2348-9633 NR 36 TC 76 Z9 77 U1 2 U2 5 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD NOV PY 1993 VL 14 IS 11 BP 1385 EP 1395 DI 10.1002/jcc.540141115 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA MC646 UT WOS:A1993MC64600014 ER PT J AU GARCIA, AE STILLER, L AF GARCIA, AE STILLER, L TI COMPUTATION OF THE MEAN RESIDENCE TIME OF WATER IN THE HYDRATION SHELLS OF BIOMOLECULES SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID NEUTRON-DIFFRACTION ANALYSIS; HYDROPHOBIC PROTEIN; AQUEOUS-SOLUTION; DYNAMICS; CRAMBIN; MOLECULES; CRYSTALS; LYSOZYME; SOLVENT; DNA AB An algorithm is presented within the context of the calculation of the time-relaxation behavior of the hydration shells around atomic sites in biomolecules. We report a calculation of the time-relaxation behavior of the first and second hydration shells of polar, hydrophobic, and charged groups in a protein, crambin. The water mean residence times around protein groups are obtained from averages over configurations sampled during a 325-ps molecular dynamics simulation of crambin in solution. A convolution arising in the calculation of the mean relaxation time is implemented using a parallel prefix operator. A new characterization is given of the parallel prefix operator as a linear transformation, and this formulation enables us to derive efficient factorization of the convolution as a product of two parallel prefix operations. The parallel prefix operations are implemented in logarithmic time. (C) 1993 by John Wiley & Sons, Inc. C1 JOHNS HOPKINS UNIV,DEPT COMP SCI,BALTIMORE,MD 21218. RP GARCIA, AE (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,T-10,MS K710,LOS ALAMOS,NM 87545, USA. NR 55 TC 119 Z9 119 U1 0 U2 10 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD NOV PY 1993 VL 14 IS 11 BP 1396 EP 1406 DI 10.1002/jcc.540141116 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA MC646 UT WOS:A1993MC64600015 ER PT J AU JUDSON, RS JAEGER, EP TREASURYWALA, AM PETERSON, ML AF JUDSON, RS JAEGER, EP TREASURYWALA, AM PETERSON, ML TI CONFORMATIONAL SEARCHING METHODS FOR SMALL MOLECULES .2. GENETIC ALGORITHM APPROACH SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID DYNAMICS; SEQUENCE; DESIGN AB We demonstrate the use of a genetic algorithm (GA) search procedure for finding low-energy conformations of small to medium organic molecules (1-12 rotatable bonds). GAs are in a class of biologically motivated optimization methods that evolve a population of individuals where individuals who are more ''fit'' have a higher probability of surviving into subsequent generations. Here, an individual is a conformation of a given molecule and the fitness is the molecule's conformational energy. In the course of a simulated evolution, the population produces conformations having increasingly lower energy. We test the GA method on a suite of 72 molecules and compare the performance against the CSEARCH algorithm in Sybyl. For molecules with more than eight rotatable bonds, the GA method is more efficient computationally and as the number of rotatable bonds increases the relative efficiency of the GA method grows. The GA method also found energies equal to or lower than the energy of the relaxed crystal structure in the large majority of cases. (C) 1993 by John Wiley & Sons, Inc. C1 STERLING WINTHROP INC,COLLEGEVILLE,PA 19426. RP JUDSON, RS (reprint author), SANDIA NATL LABS,CTR COMPUTAT ENGN,LIVERMORE,CA 94551, USA. OI Judson, Richard/0000-0002-2348-9633 NR 39 TC 76 Z9 77 U1 0 U2 7 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD NOV PY 1993 VL 14 IS 11 BP 1407 EP 1414 DI 10.1002/jcc.540141117 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA MC646 UT WOS:A1993MC64600016 ER PT J AU OROURKE, PJ BRACKBILL, JU LARROUTUROU, B AF OROURKE, PJ BRACKBILL, JU LARROUTUROU, B TI ON PARTICLE GRID INTERPOLATION AND CALCULATING CHEMISTRY IN PARTICLE-IN-CELL METHODS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FLAME PROPAGATION; DYNAMICS; MODEL; FLIP C1 INRIA, CERMICS, F-06560 VALBONNE, FRANCE. RP OROURKE, PJ (reprint author), LOS ALAMOS NATL LAB, GRP T-3, LOS ALAMOS, NM 87545 USA. NR 19 TC 17 Z9 17 U1 1 U2 1 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD NOV PY 1993 VL 109 IS 1 BP 37 EP 52 DI 10.1006/jcph.1993.1197 PG 16 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA MD724 UT WOS:A1993MD72400004 ER PT J AU LANGNAU, A BRODSKY, SJ AF LANGNAU, A BRODSKY, SJ TI PERTURBATION-THEORY IN LIGHT-CONE QUANTIZATION SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID INFINITE-MOMENTUM FRAME; ANOMALOUS MAGNETIC-MOMENT; QUANTUM ELECTRODYNAMICS; FIELD-THEORY; RENORMALIZATION; SCATTERING; QCD RP LANGNAU, A (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 27 TC 5 Z9 5 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD NOV PY 1993 VL 109 IS 1 BP 84 EP 92 DI 10.1006/jcph.1993.1201 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA MD724 UT WOS:A1993MD72400008 ER PT J AU NEWMAN, ME ELZERMAN, AW LOONEY, BB AF NEWMAN, ME ELZERMAN, AW LOONEY, BB TI FACILITATED TRANSPORT OF SELECTED METALS IN AQUIFER MATERIAL PACKED-COLUMNS SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID SOLUTE TRANSPORT; SOIL; EQUILIBRIUM; SORPTION; SYSTEMS; CADMIUM; COMPLEXATION; ADSORPTION; SIMULATION; MOBILITY AB Several factors may enhance the mobility of metals in an aquifer. Metals in such systems may associate with inorganic or organic ligands that affect retardation or with mobile colloids which may provide a faster transport mechanism. Complexation and/or sorption of a fraction of the metal may result in mobility in excess of that predicted using a single equilibrium based distribution coefficient which was derived from a more simple system. Failure to predict enhanced contaminant mobility may result in false predictions of arrival times and concentrations, and underestimation of human exposure to a contaminant. In this paper the results of a series of laboratory column studies designed to investigate factors influencing enhanced mobility of metals (Cd, Cu, Cr and Pb) in an aquifer are presented. The first of two peaks in effluent metal concentration resulting from a pulse input of metal waste to an aquifer material packed column was observed to coincide with a peak in effluent turbidity. SEM/EDX analysis showed metals to be sorbed to the surface of the turbidity causing colloids. These observations indicated association with mobile colloids may facilitate the transport of metals through soil packed columns. The mobilization and/or transport of colloids was apparently influenced by alterations in eluent chemistry, such as pH and ionic strength. The results also indicated complexation can enhance Pb mobility. Greater sensitivity of mobility to alterations in groundwater chemistry was observed for Pb and Cr than for Cd and Cu. C1 WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29808. RP NEWMAN, ME (reprint author), CLEMSON UNIV,CLEMSON,SC 29634, USA. NR 41 TC 30 Z9 31 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD NOV PY 1993 VL 14 IS 3-4 BP 233 EP 246 DI 10.1016/0169-7722(93)90026-O PG 14 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA MR014 UT WOS:A1993MR01400004 ER PT J AU ZAKHAROV, ND WERNER, P CHEN, Y SWIDER, W LILIENTALWEBER, Z WASHBURN, J KLEM, JF TSAO, JY AF ZAKHAROV, ND WERNER, P CHEN, Y SWIDER, W LILIENTALWEBER, Z WASHBURN, J KLEM, JF TSAO, JY TI COMPOSITIONAL NONUNIFORMITIES AND STRAIN RELAXATION AT MISORIENTED INXGA1-XAS GAAS INTERFACES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE INGAAS GAAS; MISFIT DISLOCATIONS; STRAIN RELAXATION AB Compositional nonuniforimities and misfit dislocations are observed near misoriented In0.2Ga0.8As/GaAs interfaces. The compositional nonuniformities result from In interdiffusion at the interface over a distance of 3 nm and formation of InAs platelet precipitates. The misfit dislocations are of pure edge and 60-degrees types. The core of pure edge misfit dislocations generally consists of two 60-degrees dislocations separated by approximately 2.5 nm. One of these 60-degrees dislocations is usually split into partials and decorated by platelets of InAs. The interface and surface morphologies are strongly influenced by the substrate tilt away from exact [001] crystallographic orientation. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ZAKHAROV, ND (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Schaff, William/B-5839-2009; Liliental-Weber, Zuzanna/H-8006-2012 NR 7 TC 1 Z9 1 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1993 VL 22 IS 11 BP 1341 EP 1344 DI 10.1007/BF02817697 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MF819 UT WOS:A1993MF81900006 ER PT J AU WARD, TE BRUHN, DF SHEAN, ML WATKINS, CS BULMER, D WINSTON, V AF WARD, TE BRUHN, DF SHEAN, ML WATKINS, CS BULMER, D WINSTON, V TI CHARACTERIZATION OF A NEW BACTERIOPHAGE WHICH INFECTS BACTERIA OF THE GENUS ACIDIPHILIUM SO JOURNAL OF GENERAL VIROLOGY LA English DT Article ID ACIDOPHILIC THERMOPHILIC BACTERIA; LIPID-CONTAINING PHAGE; HETEROTROPHIC BACTERIA; SP-NOV; DNA AB A novel bacteriophage, termed phiAc1, that infects strains of the genus Acidiphilium (acidophilic, heterotrophic, aerobic, Gram-negative eubacteria) most commonly isolated from acidic mine drainage environments, has been discovered and several of its properties have been determined. This is the first report of a bacteriophage infecting such cells. The virion has a lambdoid morphology and is larger than lambda, as shown by electron microscopy and sucrose gradient centrifugation. The sedimentation coefficient of the virion is approximately 615S. The nucleic acid of phiAc1 is dsDNA, approximately 102 kb in length. Several experimental results show that phiAc1 is a temperate phage. The plaques are turbid, and most cells isolated from plaques produced on sensitive cells by filter-sterilized phage preparations contain the phage and are resistant to further phage infection. Southern blot analysis shows that phiAc1 prophage DNA is integrated into the bacterial genome during the temperate growth phase. C1 IDAHO STATE UNIV,DEPT BIOL SCI,POCATELLO,ID 83201. RP WARD, TE (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 29 TC 3 Z9 4 U1 0 U2 2 PU SOC GENERAL MICROBIOLOGY PI READING PA HARVEST HOUSE 62 LONDON ROAD, READING, BERKS, ENGLAND RG1 5AS SN 0022-1317 J9 J GEN VIROL JI J. Gen. Virol. PD NOV PY 1993 VL 74 BP 2419 EP 2425 DI 10.1099/0022-1317-74-11-2419 PN 11 PG 7 WC Biotechnology & Applied Microbiology; Virology SC Biotechnology & Applied Microbiology; Virology GA MF244 UT WOS:A1993MF24400014 PM 8245857 ER PT J AU GOSLING, JT AF GOSLING, JT TI THE SOLAR-FLARE MYTH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID CORONAL MASS EJECTIONS; ENERGETIC PARTICLE EVENTS; INTERPLANETARY SHOCKS; GEOMAGNETIC-ACTIVITY; MAGNETIC STORMS; RAY EVENTS; ACCELERATION; FIELDS; IONS; DST AB Many years of research have demonstrated that large, nonrecurrent geomagnetic storms, shock wave disturbances in the solar wind, and energetic particle events in interplanetary space often occur in close association with large solar flares. This result has led to a paradigm of cause and effect - that large solar flares are the fundamental cause of these events in the near-Earth space environment. This paradigm, which I call ''the solar flare myth,'' dominates the popular perception of the relationship between solar activity and interplanetary and geomagnetic events and has provided much of the pragmatic rationale for the study of the solar flare phenomenon. Yet there is good evidence that this paradigm is wrong and that flares do not generally play a centfal role in producing major transient disturbances in the near-Earth space environment. In this paper I outline a different paradigm of cause and effect that removes solar flares from their central position in the chain of events leading from the Sun to near-Earth space. Instead, this central role is given to events known as coronal mass ejections. RP LOS ALAMOS NATL LAB, MS D466, LOS ALAMOS, NM 87545 USA. NR 84 TC 506 Z9 519 U1 4 U2 25 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9380 EI 2169-9402 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD NOV 1 PY 1993 VL 98 IS A11 BP 18937 EP 18949 DI 10.1029/93JA01896 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MG097 UT WOS:A1993MG09700007 ER PT J AU MILLER, RH RASMUSSEN, CE GOMBOSI, TI KHAZANOV, GV WINSKE, D AF MILLER, RH RASMUSSEN, CE GOMBOSI, TI KHAZANOV, GV WINSKE, D TI KINETIC SIMULATION OF PLASMA FLOWS IN THE INNER MAGNETOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID SEMIKINETIC MODEL; ELECTRIC-FIELD; IONOSPHERE AB A one-dimensional hybrid panicle code is used to study the interactions between upflowing thermal ions from conjugate ionospheres. The simulation model allows for multiple species, convection of plasmaspheric flux tubes, and Coulomb self-collisions which conserve momentum and energy locally. The model incorporates a variable-flux boundary condition where the flux, at the boundaries, approaches zero as the plasmasphere fills and equilibrium conditions are reached. The effects of two important processes on plasmaspheric refilling have been considered. The first includes convection of the plasmaspheric flux tube. The second is the interaction of ionospheric thermal plasma and panicle injection from an external source. Particle injection seems to play an important role in the evolution of the total particle distribution on the early timescales (t < 1 hour); however, for late timescales (t > 8 days) the thermal plasma from the ionosphere dominates the particle distribution. C1 LOS ALAMOS NATL LAB, DIV APPL THEORET PHYS, LOS ALAMOS, NM 87545 USA. RP UNIV MICHIGAN, DEPT ATMOSPHER OCEAN & SPACE SCI, SPACE PHYS RES LAB, ANN ARBOR, MI 48109 USA. RI Gombosi, Tamas/G-4238-2011 OI Gombosi, Tamas/0000-0001-9360-4951 NR 38 TC 24 Z9 24 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9380 EI 2169-9402 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD NOV 1 PY 1993 VL 98 IS A11 BP 19301 EP 19313 DI 10.1029/93JA01292 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MG097 UT WOS:A1993MG09700038 ER PT J AU MCELIGOT, DM STOOTS, CM CHRISTENSON, WA MECHAM, DC LUSSIE, WG AF MCELIGOT, DM STOOTS, CM CHRISTENSON, WA MECHAM, DC LUSSIE, WG TI TURBULENT NATURAL-CONVECTION FROM A VERTICAL CYLINDER TO AN ARRAY OF COOLED TUBES SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE ENCLOSURE FLOWS; NATURAL CONVECTION; TURBULENCE ID CONSTANT HEAT-FLUX; INNER WALL; ANNULUS AB In order to determine whether available correlations are adequate to treat a complicated, turbulent natural convection problem encountered in industrial practice, experiments were conducted by resistively heating a slender, vertical cylinder centered inside a concentric perforated tube, which was, in turn, surrounded by an array of three larger-diameter cooled tubes. The ratio of the test section temperature to the cooling tube temperature was varied up to 2.6; and the Rayleigh number, based on tube diameter and properties evaluated at the cooling tube temperature, ranged from 2.9 x 10(4) to 9.2 x 10(5). Results indicate that the convective heat transfer parameters for the perforated tube are about 15 percent higher than for the smooth bare tube centered in the same position relative to the array. The Nusselt number for convective heat transfer across the annulus between the heated test section and the perforated tube corresponded approximately to parallel laminar flow (i. e., Nu(s) almost-equal-to 1). C1 UNIV ARIZONA,DEPT AEROSP MECH ENGN,TUCSON,AZ 85721. UNIV IDAHO,IDAHO FALLS,ID 83415. RP MCELIGOT, DM (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 46 TC 2 Z9 2 U1 1 U2 4 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD NOV PY 1993 VL 115 IS 4 BP 928 EP 937 DI 10.1115/1.2911389 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MK983 UT WOS:A1993MK98300014 ER PT J AU WAMBSGANSS, MW FRANCE, DM JENDRZEJCZYK, JA TRAN, TN AF WAMBSGANSS, MW FRANCE, DM JENDRZEJCZYK, JA TRAN, TN TI BOILING HEAT-TRANSFER IN A HORIZONTAL SMALL-DIAMETER TUBE SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE BOILING; EVAPORATION; MULTIPHASE FLOWS ID GENERAL CORRELATION; VERTICAL TUBES; FLOW AB Results of a study on boiling heat transfer of refrigerant R-113 in a small-diameter (2.92 mm) tube are reported. Local heat transfer coefficients are measured for a range of heat flux (8.8-90.75 kW/m2), mass flux (50-300 kg/m2s), and equilibrium mass quality (0-0.9). The measured coefficients are used to evaluate 10 different heat transfer correlations, some of which have been developed specifically for refrigerants. High heat fluxes and low mass fluxes are inherent in small channels, and this combination results in high boiling numbers. In addition, based on a flow pattern map developed from adiabatic experiments with air-water mixtures, it has been shown that small-diameter channels produce a slug flow pattern over a large range of parameters when compared with larger-diameter channels. The effects of high boiling number and slug flow pattern lead to domination by a nucleation mechanism. As a result, the two-phase correlations that predicted this dominance also predicted the data the best when they properly modeled the physical parameters. The correlation of Lazarek and Black (1982) predicted the data very well. It is also shown that a simple form, suggested by Stephan and Abdelsalam (1980) for nucleate pool boiling, correlates the data equally well; both correlations are within a mean deviation of less than 13 percent. Results are applicable to boiling in compact heat exchangers. C1 UNIV ILLINOIS,DEPT MECH ENGN,CHICAGO,IL 60680. RP WAMBSGANSS, MW (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENT,ARGONNE,IL 60439, USA. NR 28 TC 160 Z9 165 U1 0 U2 27 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD NOV PY 1993 VL 115 IS 4 BP 963 EP 972 DI 10.1115/1.2911393 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MK983 UT WOS:A1993MK98300018 ER PT J AU DUIGNAN, MR GREENE, GA IRVINE, TF AF DUIGNAN, MR GREENE, GA IRVINE, TF TI THE EFFECT OF SURFACE GAS INJECTION ON FILM BOILING HEAT-TRANSFER SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE AUGMENTATION AND ENHANCEMENT; BOILING; MULTIPHASE FLOWS ID HORIZONTAL PLATE AB A database was developed for heat transfer from a horizontal plate with film boiling and gas jetting occurring simultaneously, in a pool of water maintained at its saturation temperature. The effect of passing nitrogen through established film boiling is to increase the heat transfer from that surface. At the highest measured superficial gas velocity, approximately 8.5 cm/s, and for a constant surface temperature, the heat transfer increases by a factor of two over the heat transfer with no enhancement by gas flux. Further, as the superficial gas velocity approaches zero, the data approach the stable film boiling asymptote. A model was developed to correlate the database. The result is an equation that represents better than 90 percent of all the measured data within +/- 15 percent bounds. C1 BROOKHAVEN NATL LAB, DEPT NUCL ENERGY, UPTON, NY 11973 USA. SUNY STONY BROOK, DEPT MECH ENGN, STONY BROOK, NY 11794 USA. RP WESTINGHOUSE SAVANNAH RIVER CO, SAVANNAH RIVER TECHNOL CTR, AIKEN, SC 29802 USA. NR 21 TC 1 Z9 1 U1 0 U2 0 PU ASME PI NEW YORK PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA SN 0022-1481 EI 1528-8943 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD NOV PY 1993 VL 115 IS 4 BP 986 EP 992 DI 10.1115/1.2911395 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MK983 UT WOS:A1993MK98300020 ER PT J AU CHU, TY AF CHU, TY TI A CORRELATIONAL APPROACH TO TURBULENT SATURATED FILM BOILING SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE BOILING ID HEAT-TRANSFER AB A correlation method for saturated film boiling is proposed. The correlation is based on the analogy between film boiling and natural convection. As in the case of natural convection, the turbulent film boiling correlation takes the form of a Nusselt number versus the Rayleigh number power law, Nu(B) is-proportional-to Ra(B)1/3. The proposed correlation shows very good agreement with current data for film boiling of water from vertical surfaces. The general applicability of the correlation is established by comparisons with film boiling data from R-113 and cryogenic fluids. RP SANDIA NATL LABS, DEPT SEVERE ACCID PHENOMENOL, ALBUQUERQUE, NM 87185 USA. NR 25 TC 4 Z9 4 U1 0 U2 2 PU ASME PI NEW YORK PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA SN 0022-1481 EI 1528-8943 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD NOV PY 1993 VL 115 IS 4 BP 993 EP 997 DI 10.1115/1.2911396 PG 5 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MK983 UT WOS:A1993MK98300021 ER PT J AU HAVSTAD, MA MCLEAN, W SELF, SA AF HAVSTAD, MA MCLEAN, W SELF, SA TI MEASUREMENTS OF THE THERMAL RADIATIVE PROPERTIES OF LIQUID URANIUM SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE LIQUID METALS; RADIATION; THERMOPHYSICAL PROPERTIES AB Measurements of the thermal radiative properties of liquid uranium have been made using an instrument with two optical systems, one for measuring the complex index of refraction by ellipsometry, the other for measuring the normal spectral emissivity by direct comparison to an integral blackbody cavity. The measurements cover the wavelength range 0.4-10 mum with sample temperatures between 1410 and 1630 K. Two 5-KeV ion sputter guns and an Auger spectrometer produce and verify, in situ, atomically pure sample surfaces. Good agreement between the two methods is observed for the normal spectral emissivity, which varies with wavelength in a manner typical of transition metals. The two components of the complex index of refraction-the index of refraction and the extinction coefficient-increase with wavelength, from approximately 3 at 0.4 mum to approximately 20 at 9.5 mum. Both components of polarized reflectivity are shown for visible to infrared wavelengths. C1 STANFORD UNIV,STANFORD,CA 94305. RP HAVSTAD, MA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 3 Z9 3 U1 0 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD NOV PY 1993 VL 115 IS 4 BP 1013 EP 1020 DI 10.1115/1.2911355 PG 8 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MK983 UT WOS:A1993MK98300024 ER PT J AU SELBY, PB BOLCH, SN MIERZEJEWSKI, VS MCKINLEY, TW RAYMER, GD AF SELBY, PB BOLCH, SN MIERZEJEWSKI, VS MCKINLEY, TW RAYMER, GD TI SYNERGISTIC INTERACTIONS BETWEEN 2 SKELETAL MUTATIONS IN MICE - INDIVIDUAL AND COMBINED EFFECTS OF THE SEMIDOMINANTS CLEIDOCRANIAL DYSPLASIA (CCD) AND SHORT DIGITS (DSH) SO JOURNAL OF HEREDITY LA English DT Article ID INDUCED DOMINANT MUTATIONS; ABNORMALITIES AB Heterozygotes for cleidocranial dysplasia (Ccd) and short digits (Dsh) were crossed to test whether synergistic interactions occur between different dominant mutations whose individual pleiotropic phenotypic effects exhibit a common feature. These unlinked mutations are homozygous lethal, and they are congenic on the C57BL/10 background. Each mutation caused more than 10 different anomalies and showed variable expressivity. Each mutation produced several malformations that were present in every heterozygote. Seven different synergistic interactions were found, including one that yielded an entirely new abnormality not predicted from any abnormalities found in either of the single heterozygotes. Although synergistic interactions between dominant mutations have not, to our knowledge, been described in humans, these findings in mice increase the probability that they occur in humans. Under certain circumstances in human populations, the segregation of mutations causing synergistic interactions of the type demonstrated might be confused with recessive inheritance. It will be important to learn whether synergistic interactions can occur between other mutations. If they can, it will probably become important to take synergistic interactions into account when estimating the genetic hazards to humans from mutagens. Three antagonistic interactions were also found. C1 TEXAS A&M UNIV SYST,COLL VET MED,TEXAS VET MED CTR,COLL STN,TX 77843. RP SELBY, PB (reprint author), OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831, USA. NR 19 TC 5 Z9 5 U1 0 U2 0 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 SN 0022-1503 J9 J HERED JI J. Hered. PD NOV-DEC PY 1993 VL 84 IS 6 BP 466 EP 474 PG 9 WC Evolutionary Biology; Genetics & Heredity SC Evolutionary Biology; Genetics & Heredity GA MM565 UT WOS:A1993MM56500007 PM 8270769 ER PT J AU MULHOLLAND, PJ AF MULHOLLAND, PJ TI HYDROMETRIC AND STREAM CHEMISTRY EVIDENCE OF 3 STORM FLOWPATHS IN WALKER-BRANCH WATERSHED SO JOURNAL OF HYDROLOGY LA English DT Article ID CONTROLLING SUBSURFACE TRANSPORT; 2 FORESTED WATERSHEDS; SOLUTE TRANSPORT; UPPER SUBCATCHMENT; NEW-ZEALAND; FLOW; RUNOFF; SOIL; HILLSLOPE; EVENTS AB Hydrometric and stream chemistry measurements were made across a network of sites to identify the dominant flowpaths producing storm runoff in Walker Branch Watershed, a small forested catchment with deep soils overlying dolomitic bedrock in eastern Tennessee. Recession analysis of storm hydrographs and an end-member mixing analysis using Ca and SO4 concentrations suggested that three subsurface flowpaths were important in streamflow generation during a storm in March 1991. The chemical end-member mixing analysis indicated that vadose zone, saturated soil zone, and bedrock zone flowpaths contributed to streamflow, but the contribution of each varied over space and time. Bedrock zone flow, with high concentrations of Ca and low concentrations of SO4, dominated during baseflow prior to the storm, and was more important at a lower stream site than an upper stream site. Vadose zone water, with low concentrations of Ca and high concentrations of SO4, dominated the stormflow response at both stream sites, but was more important at the upper site than the lower site. Water level observations from shallow and deep hillslope and ridgetop wells showed the development of transient, perched groundwater tables within the top several meters of soil. Large increases in streamflow generated via vadose zone and saturated soil zone flowpaths appeared to be dependent on development of these zones of perched saturation in the upper soil profile and the initiation oflateraI and vertical preferential flow. RP MULHOLLAND, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Mulholland, Patrick/C-3142-2012 NR 42 TC 105 Z9 109 U1 2 U2 22 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1694 J9 J HYDROL JI J. Hydrol. PD NOV PY 1993 VL 151 IS 2-4 BP 291 EP 316 DI 10.1016/0022-1694(93)90240-A PG 26 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA MP972 UT WOS:A1993MP97200010 ER PT J AU HAWKINS, RJ KALLMAN, JS AF HAWKINS, RJ KALLMAN, JS TI LINEAR ELECTRONIC DISPERSION AND FINITE-DIFFERENCE TIME-DOMAIN CALCULATIONS - A SIMPLE APPROACH SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article AB We show how the novel application of a simple causality argument simplifies significantly the incorporation of linear electronic dispersion into the finite-difference time-domain equations of motion. In particular, linear dispersion adds a single simple recursive term to the standard Yee equations. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 9 TC 8 Z9 9 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD NOV PY 1993 VL 11 IS 11 BP 1872 EP 1874 DI 10.1109/50.251186 PG 3 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA MN057 UT WOS:A1993MN05700021 ER PT J AU LABOY, SE YOUNG, BA AF LABOY, SE YOUNG, BA TI THE 5TH INTERNATIONAL WORKSHOP ON LOW-TEMPERATURE DETECTORS - PREFACE SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Editorial Material C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. RP LABOY, SE (reprint author), LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,LIVERMORE,CA 94550, USA. NR 0 TC 11 Z9 11 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 185 EP 187 DI 10.1007/BF00693418 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200001 ER PT J AU MEIER, J EGELHOF, P FISCHER, C HIMMLER, A KIRCHNER, G VONKIENLIN, A KRAUS, G HENNING, W SHEPARD, KW AF MEIER, J EGELHOF, P FISCHER, C HIMMLER, A KIRCHNER, G VONKIENLIN, A KRAUS, G HENNING, W SHEPARD, KW TI ENERGY SENSITIVE DETECTION OF HEAVY-IONS WITH TRANSITION EDGE CALORIMETERS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY AB Status and results of a research project are reported, which aims at developing calorimetric low temperature detectors for heavy ions. The special conditions for the detection of energetic heavy ions are discussed. The response of an aluminium transition edge calorimeter, operated at about 1.5K, to the impact of heavy ions was investigated. The observed energy resolutions DELTAE/E = 3.9 x 10(-3) for 5.9MeV/u Pb-208-ions, DELTAE/E = 1.6 x 10(-3) for 4.8 MeV/u Ni-58-ions and DELTAE/E = 4.3 x 10(-3) for 100 MeV/u Ne-20-ions are most probably not yet limited by the intrinsic detector resolution. The present results already represent an improvement over conventional solid state detectors and ionization chambers. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP MEIER, J (reprint author), GESSELLS SCHWERIONENFORSCH,D-64220 DARMSTADT,GERMANY. NR 5 TC 9 Z9 9 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 231 EP 238 DI 10.1007/BF00693425 PG 8 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200008 ER PT J AU AUBOURG, E CUMMINGS, A SHUTT, T STOCKWELL, W BARNES, PD DASILVA, A EMES, J HALLER, EE LANGE, AE ROSS, RR SADOULET, B SMITH, G WANG, N WHITE, S YOUNG, BA YVON, D AF AUBOURG, E CUMMINGS, A SHUTT, T STOCKWELL, W BARNES, PD DASILVA, A EMES, J HALLER, EE LANGE, AE ROSS, RR SADOULET, B SMITH, G WANG, N WHITE, S YOUNG, BA YVON, D TI MEASUREMENT OF ELECTRON-PHONON DECOUPLING TIME IN NEUTRON-TRANSMUTATION DOPED GERMANIUM AT 20-MK SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY AB We have studied the electron-phonon decoupling in Neutron-Transmutation Doped (NTD) Germanium thermistors below 50 mK, and measured a characteristic time constant of this phenomenon. We will discuss how our decoupling model accounts for observed non-linearities in I-V characteristics of NTD Ge and for the time structure of phonon pulses detected in a Ge crystal operated at 20 mK. C1 CENS,DAPNIA SPP,F-91191 GIF SUR YVETTE,FRANCE. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. CALTECH,PASADENA,CA 91107. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT SOIL CONSERVAT,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP AUBOURG, E (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. RI Yvon, Dominique/D-2280-2015 NR 5 TC 19 Z9 19 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 289 EP 294 DI 10.1007/BF00693435 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200018 ER PT J AU ITOH, KM HANSEN, WL BEEMAN, JW HALLER, EE FARMER, JW OZHOGIN, VI AF ITOH, KM HANSEN, WL BEEMAN, JW HALLER, EE FARMER, JW OZHOGIN, VI TI LOW-TEMPERATURE HOPPING CONDUCTION IN NEUTRON TRANSMUTATION DOPED ISOTOPICALLY ENRICHED GE-70 - GA SINGLE-CRYSTALS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID 25 MK; IONIZATION; GERMANIUM AB The temperature dependence of variable range hopping resistivity rho in neutron transmutation doped (NTD) isotopically enriched Ge-70:Ga samples is reported. Five samples with compensation ratios K less than 0.001 and Ga concentrations between 3x10(16) and 1.77x10(17) cm-3 were studied. All samples investigated show the in rho is-proportional-to T-1/2 dependence in the temperature range below 1.5K. As thermistor materials NTD Ge-70:Ga samples are found to have more than factor of two higher sensitivity than commonly used natural NTD Ge in the temperature range between 0.2K and 1K. Our results are compared with theoretical predictions for variable range hopping conduction. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MISSOURI,COLUMBIA,MO 65211. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,RUSSIA. RP ITOH, KM (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. RI Itoh, Kohei/C-5738-2014 NR 14 TC 6 Z9 6 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 307 EP 312 DI 10.1007/BF00693438 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200021 ER PT J AU KNOWLTON, WB ITOH, KM BEEMAN, JW EMES, JH LORETTO, D HALLER, EE AF KNOWLTON, WB ITOH, KM BEEMAN, JW EMES, JH LORETTO, D HALLER, EE TI GE-AU EUTECTIC BONDING OF GE (100) SINGLE-CRYSTALS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID PHONON AB We present preliminary results on the eutectic bonding between two {100} Ge single crystal surfaces using thin films of Au ranging from 900 angstrom/surface to 300angstrom/surface and Pd (10% the thickness of Au). Following bonding, plan view optical microscopy (OM) of the cleaved interface of samples with Au thicknesses less-than-or-equal-to 500 angstrom/surface show a eutectic morphology more conducive to phonon transmission through the bond interface. High resolution transmission electron microscopy (HRTEM) cross sectional interface studies of a 300 angstrom/surface Au sample show [100] epitaxial growth of Ge. In sections of the bond, lattice continuity of the Ge is apparent through the interface. TEM studies also reveal [110] heteroepitaxial growth of Au with a Au-Ge lattice mismatch of less than 2%. Eutectic bonds with 200 angstrom/surface Au have been attained with characterization pending. An optical polishing technique for Ge has been optimized to insure intimate contact between the Ge surfaces prior to bonding. Interferometry analysis of the optically polished Ge surface shows that surface height fluctuations lie within +/-150 angstrom across an interval of 1 mm. Characterization of phonon transmission through the interface is discussed with respect to low temperature detection of ballistic phonons. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP KNOWLTON, WB (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Itoh, Kohei/C-5738-2014 NR 11 TC 2 Z9 2 U1 0 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 343 EP 348 DI 10.1007/BF00693444 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200027 ER PT J AU YOUNG, BA SHUTT, T AKERIB, D AUBOURG, E BARNES, PD CUMMINGS, A DASILVA, A EMES, J HALLER, EE MARGULIES, S ROSS, RR SADOULET, B SMITH, G STOCKWELL, W WHITE, S AF YOUNG, BA SHUTT, T AKERIB, D AUBOURG, E BARNES, PD CUMMINGS, A DASILVA, A EMES, J HALLER, EE MARGULIES, S ROSS, RR SADOULET, B SMITH, G STOCKWELL, W WHITE, S TI A STUDY OF INCOMPLETE CHARGE COLLECTION IN CRYOGENIC DETECTORS USING A SEGMENTED 60 GRAM GERMANIUM PHONON AND IONIZATION DETECTOR SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID 25 MK; CRYSTAL AB We have tested a new 60 gram germanium phonon and ionization detector to study incomplete charge collection effects in cryogenic detectors. An understanding of such effects is necessary to further improve the nuclear vs. electronic recoil discrimination capability of cryogenic detectors. The detector is operated at almost-equal-to 20 mK. If has three concentric ionization channels, and four electric field shaping structures on its sides. Phonons are sensed using NTD Ge thermistors. First results obtained using this device and moveable radioactive sources of Am-241 and Co-57 will be presented C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CENS,DAPNIA,SPP,F-91191 GIF SUR YVETTE,FRANCE. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. RP YOUNG, BA (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 8 TC 7 Z9 7 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 393 EP 398 DI 10.1007/BF00693450 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200033 ER PT J AU MEARS, CA LABOV, SE BARFKNECHT, AT AF MEARS, CA LABOV, SE BARFKNECHT, AT TI HIGH-RESOLUTION SUPERCONDUCTING X-RAY-DETECTORS WITH 2 ALUMINUM TRAPPING LAYERS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID JUNCTIONS AB Superconducting tunnel junctions coupled to superconducting absorbers may be used as high-resolution, high-efficiency x-ray spectrometers. We have tested three detectors with niobium x-ray absorbing layers coupled to aluminum layers that serve as quasiparticle traps. Two detectors differed only in barrier thickness. A third detector includes an extra absorbing layer. Here we present a comparison of detector performance. The best energy resolution measured was 36 eV full width at half maximum at 6 keV. C1 CONDUCTUS INC,SUNNYVALE,CA 94086. RP MEARS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,POB 808,L-401,LIVERMORE,CA 94550, USA. NR 13 TC 41 Z9 41 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 561 EP 566 DI 10.1007/BF00693476 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200059 ER PT J AU PFAFMAN, TE LEGROS, M SILVER, E BEEMAN, J MADDEN, N GOULDING, F LANDIS, D AF PFAFMAN, TE LEGROS, M SILVER, E BEEMAN, J MADDEN, N GOULDING, F LANDIS, D TI PYROELECTRIC MICROCALORIMETRY SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID FILMS AB We have been measuring the bulk electrical and thermal properties of the quantum ferroelectric KTa0.992Nb0.008O3 (KTN) in the interest of making a thermal sensor for a pyroelectric microcatorimeter. The pyroelectric coefficient and specific heat of KTN as a function of temperature and electric field are given. The measurements indicate that a thin film detector with the same pyroelectric coefficient as that found in our sample would in principle be able to operate in a phonon noise limited regime over a wide bandwidth. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,LIVERMORE,CA 94550. RP PFAFMAN, TE (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 9 TC 3 Z9 3 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 721 EP 726 DI 10.1007/BF00693502 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200085 ER PT J AU STOCKWELL, W YVON, D AUBOURG, E BARNES, PD CUMMINGS, A DASILVA, A ELLMAN, B ROSS, RR SADOULET, B SHUTT, T SMITH, G STUBBS, C WANG, N WHITE, S YOUNG, BA AF STOCKWELL, W YVON, D AUBOURG, E BARNES, PD CUMMINGS, A DASILVA, A ELLMAN, B ROSS, RR SADOULET, B SHUTT, T SMITH, G STUBBS, C WANG, N WHITE, S YOUNG, BA TI LOW-NOISE FRONT-END ELECTRONICS FOR DILUTION REFRIGERATOR EXPERIMENTS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY AB We have developed low noise voltage and low noise charge sensitive preamplifiers for use in dilution refrigerator experiments. The amplifiers use a JFET at 140K as the front end. Each JFET dissipates about 7 mW on the 4K heat sink. The flat noise of the voltage amplifier is 0.9 nV/Hz1/2, with the 1/f knee below 100 Hz. The charge amplifier noise is 500 eV with a total input capacitance of approximately 90 pF. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. CALTECH,DEPT PHYS,PASADENA,CA 91125. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. CENS,SPP,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. RP STOCKWELL, W (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. RI Stubbs, Christopher/C-2829-2012; Yvon, Dominique/D-2280-2015 OI Stubbs, Christopher/0000-0003-0347-1724; NR 3 TC 3 Z9 3 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 755 EP 760 DI 10.1007/BF00693508 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200091 ER PT J AU BARNES, PD DASILVA, A AUBOURG, E AKERIB, DS BAUER, D BORDEN, D CABRERA, B CALDWELL, DO CHUGG, B CUMMINGS, A DOUGHERTY, BL EMES, J GRAY, M HALE, D HALLER, EE IRWIN, KD LANGE, AE LU, A MARGULIES, S PENN, MJ POMANSKY, AA PRITYCHENKO, BV ROSS, RR SADOULET, B SHUTT, T SMITH, A SMITH, G STOCKWELL, W TAYLOR, J WHITE, S WITHERELL, M WOLGAST, RC YELLIN, S YOUNG, BA AF BARNES, PD DASILVA, A AUBOURG, E AKERIB, DS BAUER, D BORDEN, D CABRERA, B CALDWELL, DO CHUGG, B CUMMINGS, A DOUGHERTY, BL EMES, J GRAY, M HALE, D HALLER, EE IRWIN, KD LANGE, AE LU, A MARGULIES, S PENN, MJ POMANSKY, AA PRITYCHENKO, BV ROSS, RR SADOULET, B SHUTT, T SMITH, A SMITH, G STOCKWELL, W TAYLOR, J WHITE, S WITHERELL, M WOLGAST, RC YELLIN, S YOUNG, BA TI THE 1ST CRYOGENIC DARK-MATTER EXPERIMENT SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID UNIVERSE; LIMITS AB An experimental search for dark matter particle candidates using cryogenic detectors requires a low radioactive background environment. We discuss the status of a cryogenic dark matter experiment to be performed in the Stanford Underground Facility. The detectors will be cooled in a specially designed cryostat connected to a modified side access Oxford 400 dilution refrigerator. Details of the cryostat design and its operating performance are presented. The effectiveness of the multi-level shield surrounding the cryostat, as well as the background levels we expect to achieve in the pilot experiment are discussed. Finally, we examine the limits which can be set on dark matter candidates with such an experiment. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1W5,BC,CANADA. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RUSSIAN ACAD SCI,INST NUCL RES,BAKSAN NEUTRINO OBSERV,MOSCOW,RUSSIA. RP BARNES, PD (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 18 TC 11 Z9 11 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 791 EP 796 DI 10.1007/BF00693514 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200097 ER PT J AU SADOULET, B AF SADOULET, B TI LOW-TEMPERATURE DETECTORS - AN ASSESSMENT SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID CALORIMETRIC IONIZATION DETECTOR C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SADOULET, B (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 18 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD NOV PY 1993 VL 93 IS 3-4 BP 821 EP 836 DI 10.1007/BF00693519 PG 16 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200102 ER PT J AU TSUNODA, Y NISHIOKA, Y NICKLOW, RM AF TSUNODA, Y NISHIOKA, Y NICKLOW, RM TI SPIN FLUCTUATIONS IN SMALL GAMMA-FE PRECIPITATES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID DENSITY-WAVE; CU-MN; GLASS AB Spin dynamics of an incommensurate spin-density wave (SDW) in small gamma-Fe precipitates in Cu was studied by neutron inelastic scattering. Strong spin fluctuations were observed around the broad SDW satellite peak positions even above the Neel temperature. This is not the magnon excitation because no such inelastic scattering is observed at the well defined SDW satellite peak positions for large gamma-FeCo precipitates. Similarities to the SDW clusters in CuMn spin-glass alloys are discussed. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP TSUNODA, Y (reprint author), OSAKA UNIV,FAC SCI,TOYONAKA,OSAKA 560,JAPAN. NR 13 TC 46 Z9 46 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD NOV PY 1993 VL 128 IS 1-2 BP 133 EP 137 DI 10.1016/0304-8853(93)90867-2 PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA MH733 UT WOS:A1993MH73300022 ER PT J AU ROBINSON, RA LAWSON, AC GOLDSTONE, JA BUSCHOW, KHJ AF ROBINSON, RA LAWSON, AC GOLDSTONE, JA BUSCHOW, KHJ TI MAGNETOSTRUCTURAL DISTORTIONS IN THE NONCOLLINEAR HEXAGONAL ANTIFERROMAGNET UPDSN SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article AB The intermetallic compound UPdSn has been studied by means of high-resolution neutron powder diffraction at low temperature, and both orthorhombic and monoclinic structural distortions have been observed. In addition to confirming the previously published noncollinear antiferromagnetic structures with these symmetries, full Rietveld refinements including the magnetic cross sections have been made on the new data, jointly with older low-resolution data. The structure is monoclinic below 25 K with space group P2(1) and magnetic symmetry P(C)2(1), orthorhombic between 25 and 40 K with structural space group Cmc2(1) and magnetic space group P(C)m'c2(1), and paramagnetic above 40 K with space group P6(3)mc. The temperature variations of the orthorhombicity (b/square-root 3 - a) and monoclinicity (gamma - 90) parameters have been extracted and the monoclinicity is linearly coupled to the x-component of the uranium magnetic moment mu(x), the 'magnetic monoclinicity' order parameter. In contrast, the orthorhombicity seems to be coupled to the total uranium magnetic moment. The sign of the coupling between mu(x) and gamma-90 has also been determined. It is positive, that is the projected moments prefer to point across the shorter diagonal of the monoclinic basal plane, rather than the longer diagonal. C1 PHILIPS RES LABS,5600 JA EINDHOVEN,NETHERLANDS. RP ROBINSON, RA (reprint author), LOS ALAMOS NATL LAB,LANSCE,MAIL STOP H805,LOS ALAMOS,NM 87545, USA. NR 11 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD NOV PY 1993 VL 128 IS 1-2 BP 143 EP 150 DI 10.1016/0304-8853(93)90869-4 PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA MH733 UT WOS:A1993MH73300024 ER PT J AU SCRIBNER, KT CHESSER, RK AF SCRIBNER, KT CHESSER, RK TI ENVIRONMENTAL AND DEMOGRAPHIC CORRELATES OF SPATIAL AND SEASONAL GENETIC-STRUCTURE IN THE EASTERN COTTONTAIL (SYLVILAGUS-FLORIDANUS) SO JOURNAL OF MAMMALOGY LA English DT Article DE SYLVILAGUS-FLORIDANUS; DEMOGRAPHY; GENETIC STRUCTURE; HABITAT; MATRIX CORRELATION; PLAYA BASIN; REPRODUCTION; SPATIAL VARIATION; TEMPORAL VARIATION ID TAILED PRAIRIE DOG; BIOCHEMICAL GENETICS; NATURAL-POPULATIONS; PLAYA BASINS; AUTOCORRELATION; HETEROGENEITY; VARIABILITY; FREQUENCIES; DIVERSITY; MAMMALS AB Elucidation of the complex interactions of forces that affect genetic structure within and among populations is important in the assessment of short-term viability and evolution of natural populations. We examined spatial and temporal changes in genetic, demographic, and ecologic characteristics of the eastern cottontail (Sylvilagus floridanus; n = 543) within two isolated populations inhabiting playa lake basins in the Texas Panhandle. Spatial autocorrelation and contiguous clustering analyses documented nonrandom dispersion of genotypes within both populations, during each of four consecutive seasons. Considerable seasonal variation in genotypic autocorrelative patterns and size, position, and genotypic composition of significant contiguous clusters also was observed. Genotypic structuring within playa basins was particularly evident during spring, summer, and autumn; greater randomization of genetic distributions occurred in the winter, prereproductive season. Presence of spatial associations of genotypes and changes in their position and composition over seasons were influenced by episodic exchange of individuals from genetically different populations, subsequent random mating and restoration of Hardy-Weinberg genotypic proportions in resulting offspring, and patchy distribution of habitat types within playa basins. Mantel matrix regressions, which were used to test relationships among demographic, habitat, and genotypic variables show that the relative importance of each factor changes seasonally. Differences in habitat use among individuals were significantly correlated with genotypic cluster affiliation during the prereproductive period, whereas age structure became increasingly important in explaining spatial arrangement of genotypes during later periods. Although populations from different playa basins differ in gene frequency, seasonal changes in genetic structure within each population were correlated. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. UNIV GEORGIA,DEPT GENET,ATHENS,GA 30602. UNIV GEORGIA,FAC ECOL,ATHENS,GA 30602. RP SCRIBNER, KT (reprint author), UNIV GEORGIA,DEPT ZOOL,ATHENS,GA 30602, USA. NR 38 TC 22 Z9 23 U1 0 U2 14 PU AMER SOC MAMMALOGISTS PI PROVO PA BRIGHAM YOUNG UNIV, DEPT OF ZOOLOGY, PROVO, UT 84602 SN 0022-2372 J9 J MAMMAL JI J. Mammal. PD NOV PY 1993 VL 74 IS 4 BP 1026 EP 1044 DI 10.2307/1382442 PG 19 WC Zoology SC Zoology GA MK171 UT WOS:A1993MK17100024 ER PT J AU SKOFRONICK, GL CARIM, AH FOLTYN, SR MUENCHAUSEN, RE AF SKOFRONICK, GL CARIM, AH FOLTYN, SR MUENCHAUSEN, RE TI INTERFACIAL REACTION-PRODUCTS AND FILM ORIENTATION IN YBA2CU3O7-X ON ZIRCONIA SUBSTRATES WITH AND WITHOUT CEO2 BUFFER LAYERS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID YTTRIA-STABILIZED ZIRCONIA; THIN-FILMS; SUPERCONDUCTOR; MICROSTRUCTURE; TEMPERATURE; GROWTH; YBCO; TEM AB Thick film (1.2 mum) YBCO superconductors grown by pulsed laser deposition on unbuffered and CeO2-buffered single crystal (001)-oriented yttria-stabilized zirconia (YSZ) substrates have been investigated. YBCO and YSZ react to form BaZrO3 (BZO), whereas YBCO and CeO2 react to form BaCeO3. Reaction phases were examined by theta-2theta and four-circle x-ray diffraction and high resolution electron microscopy. Three orientation relationships identified for the unbuffered films were (i) (001)YBCO parallel-to (011)BZO parallel-to (001)YSZ with [110]YBCO parallel-to [100]BZO parallel-to [100]YSZ, (ii) (001)YBCO parallel-to (001)BZO parallel-to (001)YSZ with [110]YBCO parallel-to [100]BZO parallel-to [100]YZS, and (iii) (001)YBCO parallel-to (001)BZO parallel-to (001)YSZ with [100]YBCO parallel-to [100]BZO parallel-to [100]YSZ. The results suggest that for films grown at typical deposition temperatures, YBCO epitaxy is established before the interfacial reaction occurs. The presence of BaCeO3 in buffered films grown at high temperatures (790-degrees-C) was confirmed by theta-2theta scans and selected area diffraction patterns. C1 LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545. RP SKOFRONICK, GL (reprint author), PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIV PK,PA 16802, USA. NR 21 TC 57 Z9 57 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD NOV PY 1993 VL 8 IS 11 BP 2785 EP 2798 DI 10.1557/JMR.1993.2785 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA MD714 UT WOS:A1993MD71400008 ER PT J AU LOBODA, MJ FERBER, MK AF LOBODA, MJ FERBER, MK TI CHARACTERIZATION OF THE MECHANICAL-PROPERTIES OF A-SICH FILMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ELASTIC-PLASTIC INDENTATION; THIN-FILMS; ADHESION; HARDNESS; FRICTION; COATINGS; CERAMICS AB Amorphous hydrogenated silicon carbide (a-SiC: H) thin films (t < 1 mum) were grown from two different precursor gases, a methane/silane-mixture and silacyclobutane (SiC3H8). Plasma enhanced chemical vapor deposition was used to deposit a-SiC: H thin films on silicon substrates at temperatures of 175-degrees-C and 600-degrees-C. These a-SiC: H films were characterized using the mechanical properties microprobe (nanoindenter) and by scratch testing. Data and mechanical properties information collected from these measurements have been correlated with film process conditions and materials characteristics. A simplified approach was used to calculate the average nanoindentation hardness from shallow indentations. Using this technique, results for a silicon wafer are in good agreement with that previously reported. Analysis of the substrate influence on the thin film nanoindentation data implies that the measured hardness is relatively unaffected by the substrate, while the measured elastic properties are somewhat influenced by the substrate. The a-SiC: H film hardness is shown to depend on the precursor gas and molecular bonding, while the elastic properties vary with precursor gas, composition, and density, as influenced by the plasma source deposition power. The MPM data and scratch test data show similar correlations to plasma source power, film structure, and film composition. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP LOBODA, MJ (reprint author), DOW CORNING CORP,MIDLAND,MI 48686, USA. NR 20 TC 23 Z9 23 U1 1 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD NOV PY 1993 VL 8 IS 11 BP 2908 EP 2915 DI 10.1557/JMR.1993.2908 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA MD714 UT WOS:A1993MD71400022 ER PT J AU VOLLATH, D SICKAFUS, KE AF VOLLATH, D SICKAFUS, KE TI SYNTHESIS OF CERAMIC OXIDE POWDERS IN A MICROWAVE PLASMA-DEVICE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ULTRAFINE AB Synthesizing oxide ceramic powders by application of a microwave plasma is a great advantage. There are two ways the microwave plasma can be used: The first is as a source of heat for the pyrolysis of solutions and the second is to excite gas reactions to obtain nanosized powders. Both applications are superior to standard methods. A microwave cavity well suited for these experiments and its operating characteristics are described. Using a microwave plasma as a source of heat for pyrolytic decomposition of nitrates in aqueous solutions leads to a fine-grained product with particle sizes from 100 to 1000 nm. Crystallite sizes in those particles are in most cases less than 10 nn. This is demonstrated with zirconia-based ceramics, such as ZrO2 - 3 mol % Y2O3 -20 Mol % Al2O3. Depending on the conditions during pyrolysis, it is possible to obtain a product in which alumina is either dissolved in zirconia or the onset of the phase separation is observed. The energy efficiency of this process is better than 80%. If the reactants are gaseous, e.g., ZrCl4, ft is possible to produce powders with mean particle sizes of about 4 nm. In the case of zirconia, these particles are monocrystalline with a cubic structure. This structure is not in equilibrium under the experimental conditions. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VOLLATH, D (reprint author), KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST MAT FORSCH,POB 3640,D-76021 KARLSRUHE,GERMANY. NR 23 TC 21 Z9 21 U1 1 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD NOV PY 1993 VL 8 IS 11 BP 2978 EP 2984 DI 10.1557/JMR.1993.2978 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA MD714 UT WOS:A1993MD71400030 ER PT J AU STRZEPA, P ZAMIROWSKI, EJ KUPPERMAN, JB GORETTA, KC ROUTBORT, JL AF STRZEPA, P ZAMIROWSKI, EJ KUPPERMAN, JB GORETTA, KC ROUTBORT, JL TI INDENTATION, EROSION, AND STRENGTH DEGRADATION OF SILICON-ALLOYED PYROLYTIC CARBON SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID GLASS; DAMAGE; CRACKS AB The effect of sharp particle erosion on the strength and wear of silicon-alloyed pyrolytic carbon was studied. Contact damage at Vickers and Knoop indentations was also examined for comparison with damage at single-particle impact sites. It was found that pyrolytic carbon behaves much differently from most other brittle materials in that even at indentation loads up to 445 N, radial and lateral cracks were not produced. Single-particle impact sites showed a similar lack of radial and lateral crack formation, but did exhibit surface pit formation due to microfracture within, and spalling of, the contact zone. The steady-state erosion rate was similar to that of other polycrystalline ceramic materials. Post-erosion strength and strength variability decreased with increasing particle kinetic energy. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP STRZEPA, P (reprint author), CARBOMED INC,AUSTIN,TX 78752, USA. NR 21 TC 7 Z9 7 U1 1 U2 3 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 1 PY 1993 VL 28 IS 21 BP 5917 EP 5921 DI 10.1007/BF00365201 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA MG124 UT WOS:A1993MG12400037 ER PT J AU VOLLATH, D SICKAFUS, KE AF VOLLATH, D SICKAFUS, KE TI SYNTHESIS OF CERAMIC OXIDE POWDERS BY MICROWAVE PLASMA PYROLYSIS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB Ceramic powders prepared pyrolytically exhibit homogeneity and, in most cases, small grain sizes. The energy efficiency of electrically heated systems performing the pyrolysis in a stream of carrier gas is poor. Similar considerations concerning energy demand are valid for spray drying of suspensions. This situation can be improved using a microwave plasma as a source for thermal energy. The process described in this paper works with any aqueous solution of salts used as starting material in ceramics. The process was demonstrated by the synthesis of alumina, zirconia, and zirconia-based ceramic powders; where an energy efficiency of more than 80% was found. For the powder synthesis, aqueous solutions of the nitrates were used as starting materials. Through proper selection of conditions for synthesis, it is possible to obtain nanocrystalline powders, as demonstrated by electron microscopy. Because of the extreme conditions associated with plasma during synthesis, it is possible to prepare non-equilibrium structures and solid solutions in systems in which nearly no equilibrium solubility exists. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VOLLATH, D (reprint author), KERNFORSCHUNGSZENTRUM KARLSRUHE,POB 3640,D-76021 KARLSRUHE,GERMANY. NR 13 TC 10 Z9 11 U1 1 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 1 PY 1993 VL 28 IS 21 BP 5943 EP 5948 DI 10.1007/BF00365205 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA MG124 UT WOS:A1993MG12400041 ER PT J AU MAGRUDER, RH WITTIG, JE ZUHR, RA AF MAGRUDER, RH WITTIG, JE ZUHR, RA TI WAVELENGTH TUNABILITY OF THE SURFACE-PLASMON RESONANCE OF NANOSIZE METAL COLLOIDS IN GLASS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID PARTICLES AB It is demonstrated that the wavelength of the surface plasmon resonance of nanosize metal colloids embedded in silica can be changed by the alloying of metal ions using sequential implantation of different metal elements. Cu and Ag ions were sequentially implanted in silica to doses of 6 and 12 x 10(16) ions/cm2. Both Ag- and Cu-rich metal alloy colloids approximately 20 nm in diameter were formed in the silica matrix. The position of the surface plasmon resonance frequency was shifted to a frequency that depends on the elements implanted and their relative concentrations. These results have implications for the tunability of non-linear optical waveguide devices and switches. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MAGRUDER, RH (reprint author), VANDERBILT UNIV,DEPT MAT SCI & ENGN,BOX 1593-B,NASHVILLE,TN 37235, USA. NR 16 TC 68 Z9 69 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1993 VL 163 IS 2 BP 162 EP 168 DI 10.1016/0022-3093(93)90764-O PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA MF823 UT WOS:A1993MF82300006 ER PT J AU MILLER, GK BENNETT, RG AF MILLER, GK BENNETT, RG TI ANALYTICAL SOLUTION FOR STRESSES IN TRISO-COATED PARTICLES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB A closed form solution is presented for stresses in a three-layer spherical pressure vessel representative of the TRISO-coated particles in a New Production Modular High Temperature Gas-Cooled Reactor. The inner and outer layers are pyrolytic carbons that undergo creep and anisotropic swelling behavior during neutron irradiation of the particle, while the central layer is a silicon carbide that is modeled as an isotropic elastic medium. The three-layer pressure vessel is loaded by an internal fission gas pressure that builds up during irradiation and by a constant external ambient pressure. The three-layer solution is also adapted to two-layer shells where either the inner or outer pyrolytic carbon layer is absent. The closed form solution is well suited to determining particle failure probabilities using the Monte Carlo method because of its ease of programming and speed of execution versus finite difference or finite element method solutions. RP MILLER, GK (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 18 TC 24 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 1 BP 35 EP 49 DI 10.1016/0022-3115(93)90230-V PG 15 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MF314 UT WOS:A1993MF31400003 ER PT J AU KESTERNICH, W SCHEUERMANN, F ZINKLE, SJ AF KESTERNICH, W SCHEUERMANN, F ZINKLE, SJ TI RADIATION-INDUCED ELECTRICAL DEGRADATION OF CERAMIC MATERIALS - AN ARTIFACT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter ID CONDUCTIVITY; INSULATORS C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RP KESTERNICH, W (reprint author), FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, POSTFACH 1913, D-52425 JULICH, GERMANY. OI Zinkle, Steven/0000-0003-2890-6915 NR 5 TC 36 Z9 36 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 1 BP 68 EP 71 DI 10.1016/0022-3115(93)90233-O PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MF314 UT WOS:A1993MF31400006 ER PT J AU WRIGHT, RN VANSICLEN, CD AF WRIGHT, RN VANSICLEN, CD TI IN-SITU TEM OBSERVATIONS OF HELIUM BUBBLE INTERACTIONS WITH DISLOCATIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter ID ALUMINUM; GROWTH; IMPLANTATION; DIFFUSION; MOTION; GOLD RP WRIGHT, RN (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 21 TC 4 Z9 4 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 1 BP 87 EP 93 DI 10.1016/0022-3115(93)90237-S PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MF314 UT WOS:A1993MF31400010 ER PT J AU BROOKS, WS MEYER, E DONNELLY, SE VISHNYAKOV, V VALIZADEH, R TEMPLIER, C BIRTCHER, R AF BROOKS, WS MEYER, E DONNELLY, SE VISHNYAKOV, V VALIZADEH, R TEMPLIER, C BIRTCHER, R TI AN STM STUDY OF COPPER SURFACES IRRADIATED WITH LOW-ENERGY HELIUM-IONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter ID SCANNING TUNNELING MICROSCOPY C1 UNIV POITIERS,MET PHYS LAB,POITIERS,FRANCE. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BROOKS, WS (reprint author), UNIV SALFORD,DEPT ELECTR & ELECT ENGN,MANCHESTER M5 4WT,LANCS,ENGLAND. OI Donnelly, Stephen/0000-0002-9749-5550; Vishnyakov, Vladimir/0000-0003-3045-3134 NR 16 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 1 BP 107 EP 110 DI 10.1016/0022-3115(93)90241-P PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MF314 UT WOS:A1993MF31400014 ER PT J AU WILLIAMSON, MA KLEINSCHMIDT, PD AF WILLIAMSON, MA KLEINSCHMIDT, PD TI FREE-ENERGY OF FORMATION OF CS3PUCL6 AND CSPU2CL7 (VOL 201, PG 115, 1993) SO JOURNAL OF NUCLEAR MATERIALS LA English DT Correction, Addition RP WILLIAMSON, MA (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 1 BP 111 EP 111 DI 10.1016/0022-3115(93)90242-Q PG 1 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MF314 UT WOS:A1993MF31400015 ER PT J AU WIEDERSICH, H AF WIEDERSICH, H TI GENERAL INTRODUCTION TO MICROSTRUCTURAL EVOLUTION UNDER CASCADE DAMAGE CONDITIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID FREELY MIGRATING DEFECTS; DISPLACEMENT CASCADES; MOLECULAR-DYNAMICS; PRODUCTION BIAS; LOOP FORMATION; IRRADIATION; METALS; ION; CU AB A short overview of the processes that affect the evolution of the microstructure during irradiation is given. The processes include defect production with an emphasis on the effects of the dynamic cascade events, defect clustering, irradiation-enhanced diffusion, radiation-induced segregation, phase decompositions and phase transformations. A simple model for the description of the development of the defect microstructure in a pure metal during cascade producing irradiation is also outlined which can provide, in principle, defect fluxes required for the description of other microstructural processes such as phase decomposition and irradiation-induced precipitation. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 52 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 121 EP 128 DI 10.1016/0022-3115(93)90119-J PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800003 ER PT J AU SINGH, BN ZINKLE, SJ AF SINGH, BN ZINKLE, SJ TI DEFECT ACCUMULATION IN PURE FCC METALS IN THE TRANSIENT REGIME - A REVIEW SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT WORKSHOP ON TIME DEPENDENCE OF RADIATION DAMAGE ACCUMULATION AND ITS IMPACT ON MATERIALS PROPERTIES CY OCT 14-20, 1992 CL MONTREUX, SWITZERLAND SP RISO NATL LAB, PAUL SCHERRER INST, COMMISS EUROPEAN COMMUNITIES, DANISH TECH RES COUNCIL ID MEV PROTON IRRADIATION; 14-MEV NEUTRON-IRRADIATION; CASCADE DAMAGE CONDITIONS; PRODUCTION BIAS; COPPER-ALLOYS; MICROSTRUCTURAL EVOLUTION; HELIUM; ALUMINUM; FISSION; NUCLEATION AB Over the years, a considerable amount of experimental results have been reported on defect accumulation in low-dose neutron irradiated pure fcc metals. In an effort to further the understanding of the processes involved in the defect accumulation in the transient regime, the experimental results are compiled and the salient features of these results are pointed out. Experimental results in pure aluminium, copper and nickel are chosen for this review. The dose dependence of the experimentally measured parameters makes it abundantly clear that the rate of build-up of cluster density, cavity density and the void swelling reaches a maximum at very low doses (less-than-or-equal-to 0.1 dpa). There is no experimental evidence for the formation of a well defined dislocation network during irradiation of pure metals at temperatures in the void swelling regime up to a dose level of approximately 1 dpa. The experimental results allow us to identify three significant aspects of the defect accumulation behaviour under cascade damage conditions: (a) evolution of cavity microstructure in a spatially heterogeneous and segregated fashion, (b) high swelling rates at very low doses when the dislocation density is negligibly low and (c) enhanced vacancy accumulation in the vicinity of grain or subgrain boundaries. It is pointed out that these features cannot be rationalized in terms of conventional mean-field approach using chemical rate equations and dislocation bias as the only driving force. These features can be explained, however, by taking into considerations the specific nature of the cascade damage, namely, the intracascade recombination and clustering of interstitials and vacancies during the cooling down phase of a multidisplacement cascade. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP SINGH, BN (reprint author), RISO NATL LAB,DEPT MAT,POB 49,DK-4000 ROSKILDE,DENMARK. OI Zinkle, Steven/0000-0003-2890-6915 NR 108 TC 173 Z9 174 U1 9 U2 61 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 212 EP 229 DI 10.1016/0022-3115(93)90125-I PG 18 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800009 ER PT J AU GARNER, FA TOLOCZKO, MB AF GARNER, FA TOLOCZKO, MB TI HIGH-DOSE EFFECTS IN NEUTRON-IRRADIATED FACE-CENTERED-CUBIC METALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT WORKSHOP ON TIME DEPENDENCE OF RADIATION DAMAGE ACCUMULATION AND ITS IMPACT ON MATERIALS PROPERTIES CY OCT 14-20, 1992 CL MONTREUX, SWITZERLAND SP RISO NATL LAB, PAUL SCHERRER INST, COMMISS EUROPEAN COMMUNITIES, DANISH TECH RES COUNCIL ID STAINLESS-STEEL; CREEP; ALLOYS; SATURATION AB During neutron irradiation, most face-centered cubic metals and alloys develop saturation or quasi-steady state microstructures. This, in turn, leads to saturation levels or plateaus in mechanical properties and quasi-steady state rates of swelling and creep deformation. Swelling initially plays only a small role in determining these saturation states, but as swelling rises to higher levels, it exerts strong feedback on the microstructure and its response to environmental variables. The influence of swelling, either directly or indirectly via second-order mechanisms, such as elemental segregation to void surfaces, eventually causes major changes, not only in irradiation creep and mechanical properties, but also in swelling itself. The feedback effects of swelling on irradiation creep are particularly complex and lead to problems in applying creep data derived from highly pressurized creep tubes to low stress situations, such as fuel pins in liquid metal reactors. C1 UNIV CALIF SANTA BARBARA, SANTA BARBARA, CA 93106 USA. RP GARNER, FA (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 54 TC 16 Z9 16 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 230 EP 248 DI 10.1016/0022-3115(93)90126-J PG 19 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800010 ER PT J AU ZINKLE, SJ MAZIASZ, PJ STOLLER, RE AF ZINKLE, SJ MAZIASZ, PJ STOLLER, RE TI DOSE DEPENDENCE OF THE MICROSTRUCTURAL EVOLUTION IN NEUTRON-IRRADIATED AUSTENITIC STAINLESS-STEEL SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT WORKSHOP ON TIME DEPENDENCE OF RADIATION DAMAGE ACCUMULATION AND ITS IMPACT ON MATERIALS PROPERTIES CY OCT 14-20, 1992 CL MONTREUX, SWITZERLAND SP RISO NATL LAB, PAUL SCHERRER INST, COMMISS EUROPEAN COMMUNITIES, DANISH TECH RES COUNCIL ID RADIATION-INDUCED SEGREGATION; COMPOSITIONAL FLUCTUATIONS; MECHANICAL-PROPERTIES; SWELLING RESISTANCE; HFIR IRRADIATION; FUSION-REACTORS; PHASE-STABILITY; ALLOYS; HELIUM; METALS AB Microstructural data on the evolution of the dislocation loop, cavity, and precipitate populations in neutron-irradiated austenitic stainless steels are reviewed in order to estimate the displacement damage levels needed to achieve the ''steady state'' condition. The microstructural data can be conveniently divided into two temperature regimes. In the low temperature regime (below about 300-degrees-C) the microstructure of austenitic stainless steels is dominated by ''black spot'' defect clusters and faulted interstitial dislocation loops. The dose needed to approach saturation of the loop and defect cluster densities is generally on the order of 1 displacement per atom (dpa) in this regime. In the high temperature regime (approximately 300 to 700-degrees-C), cavities, precipitates, loops and network dislocations are all produced during iffadiation; doses in excess of 10 dpa are generally required to approach a ''steady state'' microstructural condition. Due to complex interactions between the various microstructural components that form during iffadiation, a secondary transient regime is typically observed in commercial stainless steels during irradiation at elevated temperatures. This slowly evolving secondary transient may extend to damage levels in excess of 50 dpa in typical 300-series stainless steels, and to > 100 dpa in radiation-resistant developmental steels. The detailed evolution of any given microstructural component in the high-temperature regime is sensitive to slight variations in numerous experimental variables, including heat-to-heat composition changes and neutron spectrum. RP ZINKLE, SJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Stoller, Roger/H-4454-2011; OI Maziasz, Philip/0000-0001-8207-334X; Zinkle, Steven/0000-0003-2890-6915 NR 106 TC 158 Z9 160 U1 7 U2 61 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 266 EP 286 DI 10.1016/0022-3115(93)90128-L PG 21 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800012 ER PT J AU MANSUR, LK AF MANSUR, LK TI THEORY OF TRANSITIONS IN DOSE DEPENDENCE OF RADIATION EFFECTS IN STRUCTURAL ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID AUSTENITIC STAINLESS-STEELS; FIELD-ION MICROSCOPY; CR-NI ALLOYS; IRRADIATED METALS; VOID GROWTH; HELIUM; MECHANISMS; KINETICS; BEHAVIOR AB During irradiation of structural materials many processes take place simultaneously. These range from the elementary production of point defects, point defect clusters, and transmutation products to more complex processes of large scale cavity and precipitate formation, and alterations in macroscopic properties. Behavior that can be defined as transient or steady-state with respect to iffadiation dose can often be recognized within each process. Transitions from one type of dose dependence to another can be particularly important. These transitions may signal changes in governing physical processes or they may result in changes in the performance of the material in technological applications. Transitions in dose dependence of point defect concentrations, helium buildup and related transient phenomena in swelling, irradiation creep, and embrittlement are discussed, with particular reference to austenitic Fe-Ni-Cr alloys. Special attention is given to the concept, derivation, and usefulness of irradiation variable shifts based on a requirement of invariance in point defect absorption. It is found that the doses at which transitions in dose dependence take place for swelling and creep for example, can vary by many orders of magnitude, depending upon irradiation conditions and material. Transitions for different phenomena can also be widely separated in dose. Under certain conditions, transient behavior can be the dominant feature in microstructure and property changes. RP OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. NR 50 TC 33 Z9 33 U1 2 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 306 EP 323 DI 10.1016/0022-3115(93)90130-Q PG 18 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800014 ER PT J AU CLINARD, FW FARNUM, EH AF CLINARD, FW FARNUM, EH TI IRRADIATION EFFECTS IN CERAMICS - TRANSITION FROM LOW TO HIGH-DOSE BEHAVIOR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT WORKSHOP ON TIME DEPENDENCE OF RADIATION DAMAGE ACCUMULATION AND ITS IMPACT ON MATERIALS PROPERTIES CY OCT 14-20, 1992 CL MONTREUX, SWITZERLAND SP RISO NATL LAB, PAUL SCHERRER INST, COMMISS EUROPEAN COMMUNITIES, DANISH TECH RES COUNCIL ID NEUTRON-IRRADIATION; DAMAGE; AL2O3; ZIRCONOLITE AB Ceramics subjected to irradiation show a wide variety of damage responses, depending on composition, nature of bonding, crystal structure, starting microstructure, and type of bombarding particles. As doses reach high damage levels (a condition that varies in magnitude from one material to another), major changes in physical properties can occur, and atomic arrangements may change from crystalline to disordered. However, some ceramics show marked resistance to damage, and some properties may improve. More work is needed to fully understand these phenomena, but it is currently possible in many cases to predict at least qualitatively both microstructural damage response and observed property changes. RP CLINARD, FW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 2 Z9 2 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 353 EP 359 DI 10.1016/0022-3115(93)90134-K PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800018 ER PT J AU BACON, DJ GAVILLET, D HORSEWELL, A ISHINO, S MANSUR, LK SINGH, BN TRINKAUS, H ULLMAIER, H VICTORIA, M AF BACON, DJ GAVILLET, D HORSEWELL, A ISHINO, S MANSUR, LK SINGH, BN TRINKAUS, H ULLMAIER, H VICTORIA, M TI SUMMARY OF MONTREUX WORKSHOP ON TIME-DEPENDENCE OF RADIATION-DAMAGE ACCUMULATION AND ITS IMPACT ON MATERIALS PROPERTIES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT WORKSHOP ON TIME DEPENDENCE OF RADIATION DAMAGE ACCUMULATION AND ITS IMPACT ON MATERIALS PROPERTIES CY OCT 14-20, 1992 CL MONTREUX, SWITZERLAND SP RISO NATL LAB, PAUL SCHERRER INST, COMMISS EUROPEAN COMMUNITIES, DANISH TECH RES COUNCIL C1 PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RISO NATL LAB,DEPT MAT,DK-4000 ROSKILDE,DENMARK. UNIV TOKYO,NUCL ENGN,BUNKYO KU,TOKYO 113,JAPAN. OAK RIDGE NATL LAB,DEPT MET & CERAM,OAK RIDGE,TN 37831. FORSCHUNGSZENTRUM JULICH,IFF,D-52425 JULICH,GERMANY. RP BACON, DJ (reprint author), UNIV LIVERPOOL,DEPT MAT SCI & ENGN,LIVERPOOL L69 3BX,ENGLAND. OI Horsewell, Andy/0000-0003-4297-2564 NR 0 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1993 VL 206 IS 2-3 BP 368 EP 371 DI 10.1016/0022-3115(93)90137-N PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA MH548 UT WOS:A1993MH54800021 ER PT J AU MOZLEY, PD STUBBS, JB KUNG, HF SELIKSON, MH STABIN, MG ALAVI, A AF MOZLEY, PD STUBBS, JB KUNG, HF SELIKSON, MH STABIN, MG ALAVI, A TI BIODISTRIBUTION AND DOSIMETRY OF IODINE-123-IBF - A POTENT RADIOLIGAND FOR IMAGING THE D2 DOPAMINE-RECEPTOR SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID POSITRON EMISSION TOMOGRAPHY; BRAIN DOPAMINE; I-123 IBZM; WILSONS-DISEASE; DYNAMIC SPECT; RAT-BRAIN; BINDING; INVITRO; AGENT; PET AB Iodine-123-labeled iodo-benzofuran (IBF) is a potent D2 dopamine receptor antagonist that has been developed as a potential SPECT imaging agent. This report documents its biodistribution and radiation dosimetry in seven healthy humans. Approximately 100 MBq of IBF were administered to each volunteer. Urine was collected to measure the fraction of the activity that was voided by the renal system. Conjugate images were serially acquired over 24 hr to determine the fraction of activity in the other organs. Standard image analysis techniques were used to measure the geometric mean count rates in the brain, GI tract, heart, liver, lungs and thyroid at each time point. Corrections for attenuation were made with I-123 transmission scans. Multicompartmental modeling was used to simulate and predict the biokinetic behavior of I-123-IBF in the rest of the body. The absorbed doses for 24 organs were then estimated with the MIRD formalism. Rapid biological washout minimized the absorbed dose to most tissues. The excretory organs were exposed to the most radiation. The lower large intestine received about 0.13 mGy/MBq (0.48 rad/mCi), and the urinary bladder received 0.11 mGy/MBq. This low radiation burden will allow more than 370 MBq (10 mCi) to be administered to healthy research subjects during each study of the D2 receptor. Since high quality images of the brain can be obtained with half this amount, the findings suggest that I-123-labeled IBF has a large margin of radiation safety in humans. Its stability in vivo and its high target-to-background contrast ratio in the human brain may make it a useful SPECT imaging agent. C1 UNIV PENN,DIV NUCL MED,PHILADELPHIA,PA 19104. UNIV PENN,DEPT RADIOL,PHILADELPHIA,PA 19104. OAK RIDGE INST SCI & EDUC,CTR RADIAT INTERNAL DOSE INFORMAT,OAK RIDGE,TN. FU NIMH NIH HHS [NIMH MH-43880]; NINDS NIH HHS [NS-24538] NR 42 TC 18 Z9 18 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD NOV PY 1993 VL 34 IS 11 BP 1910 EP 1917 PG 8 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA ME930 UT WOS:A1993ME93000017 PM 8229233 ER PT J AU RUSINEK, H TSUI, WH LEVY, AV NOZ, ME DELEON, MJ AF RUSINEK, H TSUI, WH LEVY, AV NOZ, ME DELEON, MJ TI PRINCIPAL AXES AND SURFACE FITTING METHODS FOR 3-DIMENSIONAL IMAGE REGISTRATION SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID PET IMAGES; BRAIN; MR; CT AB We evaluated the effect of the image acquisition parameters on the accuracy of the principal axes and surface-fitting techniques for three-dimensional image registration. Using two types of phantom objects, MR brain image and a mathematically defined ellipsoid, we simulated pairs of scans with known acquisition parameters, including longitudinal coverage, magnitude of misregistration, number of sections and section thickness. Both methods are sensitive to the systematic deformation of contours. The principal axes method is also sensitive to incomplete scan coverage and to the x-axis and y-axis misangulation. Both methods are insensitive to the number of sections, section thickness and the number of points per section. Surface fitting performed well without user supervision. There is no need for routine inclusion of the scaling factors as search parameters. The results confirm the feasibility of three-dimensional multimodality registration of brain scans with accuracy 1-2 mm, with surface fitting being the method of choice. C1 NYU MED CTR,DEPT PSYCHIAT,NEW YORK,NY 10016. NATHAN S KLINE INST PSYCHIAT RES,ORANGEBURG,NY. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP RUSINEK, H (reprint author), NYU MED CTR,DEPT RADIOL,BELLEVUE C BLDG,RM D120,NEW YORK,NY 10016, USA. FU NIMH NIH HHS [NIMH 44833, 2RO1MH43965-04]; SAMHSA HHS [3P3OAGOH051-0451] NR 13 TC 45 Z9 45 U1 0 U2 1 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD NOV PY 1993 VL 34 IS 11 BP 2019 EP 2024 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA ME930 UT WOS:A1993ME93000037 PM 8229253 ER EF