FN Thomson Reuters Web of Science™ VR 1.0 PT J AU WOLSKI, RM FEO, JT AF WOLSKI, RM FEO, JT TI PROGRAM PARTITIONING FOR NUMA MULTIPROCESSOR COMPUTER-SYSTEMS SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article RP WOLSKI, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,COMP RES GRP L306,POB 808,LIVERMORE,CA 94550, USA. NR 26 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 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD NOV PY 1993 VL 19 IS 3 BP 203 EP 218 DI 10.1006/jpdc.1993.1105 PG 16 WC Computer Science, Theory & Methods SC Computer Science GA MG595 UT WOS:A1993MG59500006 ER PT J AU WANG, L DAVIDS, PS SAXENA, A BISHOP, AR AF WANG, L DAVIDS, PS SAXENA, A BISHOP, AR TI CORRELATION-EFFECTS AND ELECTRONIC-PROPERTIES OF FULLERENES AND CARBON NANOTUBES SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE FULLERENES; NANOTUBES; MEANFIELD THEORY AB We calculated analytically the quasi-particle energy spectra for various fullerenes and graphitic microtubules within a mean-field theory. Correlation effects due to the Coulomb interaction between electrons are investigated by using the self-consistent quasi-particle energy spectra for microtubules. We also found a striking paramagnetic to diamagnetic ordering transition of a two-dimensional electron ps on a microtubule in an external magnetic field. RP WANG, L (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Davids, Paul/D-1550-2010 NR 5 TC 8 Z9 8 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD NOV PY 1993 VL 54 IS 11 BP 1493 EP 1496 DI 10.1016/0022-3697(93)90341-N PG 4 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA MW488 UT WOS:A1993MW48800006 ER PT J AU HE, YD AF HE, YD TI DECREASING INELASTICITY WITH ENERGY IN PP COLLISIONS SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Review ID CHARGED-PARTICLE MULTIPLICITIES; HADRON-HADRON COLLISIONS; TOTAL CROSS-SECTION; E+ E ANNIHILATION; NON-LEADING TERMS; TRANSVERSE-MOMENTUM; COSMIC-RAYS; QCD JETS; GEV-C; FRAGMENTATION REGION AB Alpha therefore The energy dependence of inelasticity in the multiparticle production of high-energy hadronic interactions is studied. The similarity between multiparticle productions in pp (p $$($) over bar p) and e(+)e(-) collisions leads to a complete picture of a universal hadronization process. Within this framework, the data of charged mutiplicity at various collider energies are used to infer average inelasticity. The result shows that inelasticity in pp collisions decreases with increasing energy in the range of root s=5-900 GeV. Consequences of the extrapolation of such a decreasing inelasticity to energies 10(14)-10(18) eV as well as other model predictions in a series of cosmic ray experiments are also addressed. C1 LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. RP HE, YD (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 99 TC 8 Z9 8 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD NOV PY 1993 VL 19 IS 11 BP 1953 EP 1966 DI 10.1088/0954-3899/19/11/022 PG 14 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA MH236 UT WOS:A1993MH23600022 ER PT J AU SHAMU, RE YOUNG, PG AF SHAMU, RE YOUNG, PG TI COUPLED-CHANNELS OPTICAL-MODEL ANALYSIS OF N-PB-208 SCATTERING AT LOW ENERGIES SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Letter ID NEUTRON-PB-208 MEAN FIELD; PB-208; RESONANCE; NEUTRONS; STATES AB Coupled-channels (CC) analyses of n-Pb-208 scattering have been performed at 8.5, 9.0, 9.5 and 10 MeV using the CC code ECIS. Elastic and inelastic differential cross-section and total cross-section neutron data were analysed. Central potential strengths were obtained from one-channel analyses of neutron total cross sections; the remaining model parameters were published proton values. We find that all low-lying collective states of Pb-208 must be included in the CC calculations, even the low-energy octupole resonance, and that a first-order vibrational model provides a very good description of these data. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SHAMU, RE (reprint author), WESTERN MICHIGAN UNIV,KALAMAZOO,MI 49008, USA. NR 28 TC 5 Z9 5 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD NOV PY 1993 VL 19 IS 11 BP L169 EP L175 DI 10.1088/0954-3899/19/11/004 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA MH236 UT WOS:A1993MH23600004 ER PT J AU JONES, DW ONEILL, RV AF JONES, DW ONEILL, RV TI LAND-USE IN THE PRESENCE OF AN ATMOSPHERE EXTERNALITY, WITH AND WITHOUT CORRECTIVE TAXES SO JOURNAL OF REGIONAL SCIENCE LA English DT Article ID POSITIVE RENT GRADIENTS; CONGESTION EXTERNALITIES; RACIAL PREJUDICE; EQUILIBRIUM; ECONOMIES; SCALE; MODEL AB Total cleared area in a von Thunen land-use model drives an atmosphere externality which depresses agricultural productivity uniformly throughout the region. Exogenous events that encourage clearance and use of a larger cultivated area (output price or population increase) exacerbate the externality. Imposition of a simple, corrective tax on land rents does not reverse these patterns but does mitigate the increase in the externality and leaves cultivators with higher incomes than they would obtain without the tax. We examine an optimal tax on land rents, designed to maximize the social value of land rents in the region, and an output tax. 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 40 TC 6 Z9 6 U1 1 U2 4 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0022-4146 J9 J REGIONAL SCI JI J. Reg. Sci. PD NOV PY 1993 VL 33 IS 4 BP 457 EP 480 DI 10.1111/j.1467-9787.1993.tb00843.x PG 24 WC Economics; Environmental Studies; Planning & Development SC Business & Economics; Environmental Sciences & Ecology; Public Administration GA MJ701 UT WOS:A1993MJ70100001 ER PT J AU GRILLY, ER AF GRILLY, ER TI PRESSURE-VOLUME-TEMPERATURE RELATIONS IN LIQUID AND SOLID TRITIUM SO JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY LA English DT Article DE DEUTERIUM; HYDROGEN; PVT RELATIONS; TRITIUM AB PVT relations in liquid and solid T2 near the melting curve were measured over 20.5 K-22.1 K and 0 MPa-7 MPa (0 bar-70 bar) with a cell that used diaphragms for pressure and volume variation and measurement. Because of ortho-para self conversion, the melting pressure P(m) and the liquid molar volume V(lm) increased with time. The rates were consistent with a second order reaction similar to that for c the J = odd concentration: dc/dt = -k1c2+k2c(1-c), where k1 = 6-9 x 10(-2) h-1. By extrapolation, the ortho and para forms differed by DELTAP(m) approximately 6 bar and DELTAV(lm) approximately 0.5%. Measurements of the volume change on melting and the thermal expansion and compressibility for liquid T2 were consistent with those for H-2 and D2. Impurities such as H-2, HT, DT, and He-3 were removed by a technique using an adsorption column of cold activated alumina. Corrections for He-3 growth during an experiment were adequate except near the triple point. RP GRILLY, ER (reprint author), LOS ALAMOS NATL LAB, CONDENSED MATTER & THERMAL PHYS GRP, LOS ALAMOS, NM 87545 USA. NR 37 TC 1 Z9 1 U1 0 U2 2 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPERINTENDENT DOCUMENTS,, WASHINGTON, DC 20402-9325 USA SN 1044-677X J9 J RES NATL INST STAN JI J. Res. Natl. Inst. Stand. Technol. PD NOV-DEC PY 1993 VL 98 IS 6 BP 679 EP 690 DI 10.6028/jres.098.044 PG 12 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MV868 UT WOS:A1993MV86800002 PM 28053492 ER PT J AU MEI, VC CHEN, FC MATHIPRAKASAM, B HEENAN, P AF MEI, VC CHEN, FC MATHIPRAKASAM, B HEENAN, P TI STUDY OF SOLAR-ASSISTED THERMOELECTRIC TECHNOLOGY FOR AUTOMOBILE AIR-CONDITIONING SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB An analytical study was conducted to determine the feasibility of employing solar energy assisted thermoelectric (TE) cooling technology in automobile air conditioners. The study addressed two key issues-power requirements and availability of thermoelectric materials. In this paper a mathematical model was developed to predict the performance of TE air conditioners and to analyze power consumption. Results show that the power required to deliver a cooling capacity of 4 kW (13,680 Btu/h) in a 38-degrees-C (100-degrees-F) environment will be 9.5 kW electric. Current TE modules suitable for air conditioning are made of bismuth telluride. The element tellurium is expected to be in short supply if TE cooling is widely implemented for auto air conditioning; some options available in this regard were studied and presented in this paper The photovoltaic (PV) cells, assumed to cover the roof area of a compact car can only generate about 225 W However, this is more than enough to power a fan to provide air ventilation to the car interior which significantly reduces the peak cooling load when the car is parked in bright sunlight. C1 MIDWEST RES INST,KANSAS CITY,MO 64110. RP MEI, VC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 8 TC 17 Z9 20 U1 4 U2 10 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD NOV PY 1993 VL 115 IS 4 BP 200 EP 205 DI 10.1115/1.2930050 PG 6 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA MH940 UT WOS:A1993MH94000003 ER PT J AU PESARAN, AA AF PESARAN, AA TI DESICCANT DEGRADATION IN DESICCANT COOLING SYSTEMS - AN EXPERIMENTAL-STUDY SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB We conducted experiments to quantify the effects of thermal cycling and exposure to contamination on solid desiccant materials that may be used in desiccant cooling systems. The source of contamination was cigarette smoke, which is considered one of the worst pollutants in building cooling applications. We exposed five different solid desiccants to ''ambient'' and ''contaminated'' humid air: silica gel, activated alumina, activated carbon, molecular sieves, and lithium chloride. We obtained the moisture capacity of samples as a function of exposure time. Compared to virgin desiccant samples, the capacity loss caused by thermal cycling with humid ambient air was 10 percent to 30 percent for all desiccants. The capacity loss because of combined effect of thermal cycling with ''smoke-filled'' humid air was between 30 percent to 70 percent. The higher losses occurred after four months of experiment time, which is equivalent to four to eight years of field operation. Using a system model and smoke degradation data on silica gel, we predicted that, for low-temperature regeneration, the loss in performance of a ventilation-cycle desiccant cooling system would be between 10 percent to 35 percent, in about eight years, with higher value under worst conditions. RP PESARAN, AA (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 10 TC 3 Z9 3 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD NOV PY 1993 VL 115 IS 4 BP 212 EP 219 DI 10.1115/1.2930052 PG 8 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA MH940 UT WOS:A1993MH94000005 ER PT J AU PESARAN, AA AF PESARAN, AA TI DESICCANT DEGRADATION IN DESICCANT COOLING SYSTEMS - A SYSTEM STUDY SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Note AB We predicted the impact of desiccant degradation on the performance of an open-cycle desiccant cooling system in ventilation mode using the degradation data on silica gel obtained from a previous study. The degradation data were based on thermal cycling desiccant samples and exposing them to ambient or contaminated air Depending on the degree of desiccant degradation, the decrease in the thermal coefficient of performance (COP) and the cooling capacity of the system for low-temperature regeneration was 10 percent to 35 percent. The 35 percent loss occurred based on the worst-case desiccant degradation scenario. Under more realistic conditions the loss in system performance is expected to be lower RP PESARAN, AA (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 4 TC 4 Z9 4 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD NOV PY 1993 VL 115 IS 4 BP 237 EP 240 DI 10.1115/1.2930056 PG 4 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA MH940 UT WOS:A1993MH94000009 ER PT J AU CHOUEIRI, EY KELLY, AJ JAHN, RG AF CHOUEIRI, EY KELLY, AJ JAHN, RG TI MASS SAVINGS DOMAIN OF PLASMA PROPULSION FOR LEO TO GEO TRANSFER SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB A parametric model is used to study the mass savings of plasma propulsion over advanced chemical propulsion for lower-Earth-orbit to geosynchronous-Earth-orbit transfer. Such savings are characterized by stringent requirements of massive payloads [O(10) metric tons] and high-power levels [O(100) kW]. Mass savings on the order of the payload mass are possible but at the expense of longer transfer times (8-20 months). Typical of the savings domain is the case of a self-field magnetoplasmadynamic (MPD) thruster running quasisteadily, at an I(s) of 2000 s, with 600 kW of input power, raising a 50 metric ton satellite in 270 days. The initial miss at LEO will be 65 ton less than a 155 ton LO2/LH2 advanced chemical high thrust spacecraft. An optimum I(s) can only be found if the cost savings associated with mass savings are counterbalanced by the cost losses incurred by longer transfer times. A simplistic cost model that illustrates the overall trends in the optimization yielded an optimum I(s) of about 2200 s for a cost effective baseline MPD system. RP CHOUEIRI, EY (reprint author), PRINCETON UNIV,ELECT PROPULS & PLASMA DYNAM LAB,PRINCETON,NJ 08544, USA. NR 32 TC 11 Z9 11 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1993 VL 30 IS 6 BP 749 EP 754 DI 10.2514/3.26381 PG 6 WC Engineering, Aerospace SC Engineering GA MK988 UT WOS:A1993MK98800014 ER PT J AU WOLF, SG MOSSER, G DOWNING, KH AF WOLF, SG MOSSER, G DOWNING, KH TI TUBULIN CONFORMATION IN ZINC-INDUCED SHEETS AND MACROTUBES SO JOURNAL OF STRUCTURAL BIOLOGY LA English DT Article ID MICROTUBULE-ASSOCIATED PROTEINS; 3-DIMENSIONAL RECONSTRUCTION; PROTOFILAMENT NUMBERS; ELECTRON-MICROSCOPY; CATHEPSIN-D; RESOLUTION; REMOVAL; MAP AB The protein tubulin is the main constituent of microtubules. Previous studies have shown that zinc ions induce the formation of crystalline sheets and macrotubes of tubulin. Both crystal types are suitable for structural studies by electron crystallography. However, crystallographic structural analysis of tubulin has been hampered by limited crystal size and quality and the inability to control crystal polymorphism. We can obtain well-ordered crystals which are grown upon prolonged incubations (up to 24 hr). The presence of NaCl delays the degradation of the crystals, and addition of the protease inhibitor pepstatin improves crystal quality. The crystal form (sheet or macrotube) can be controlled with incubation conditions. The size of the crystals can reach up to 2 mu m in width for the sheets and up to 0.5 mu m in diameter for the macrotubes. Both crystal types can reach several micrometers in length. Comparison of the projection maps of the two crystal structures shows that adjacent protofilaments in the macrotubes are shifted by about 6 Angstrom relative to their positions in the sheets. Observable changes of monomer shape appear to allow close inter-protofilament contacts to be maintained in both crystal forms. Images of glucose-embedded specimens obtained under these conditions give structural information beyond 4 Angstrom resolution. Merging of high- and low-resolution data allows for unambiguous assignment of monomer boundaries to high-resolution features. (C) 1993 Academic Press, Inc. RP WOLF, SG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. RI WOLF, SHARON/K-1768-2012 OI WOLF, SHARON/0000-0002-5337-5063 FU NIGMS NIH HHS [GM36884, GM46033] NR 27 TC 23 Z9 23 U1 1 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1047-8477 J9 J STRUCT BIOL JI J. Struct. Biol. PD NOV-DEC PY 1993 VL 111 IS 3 BP 190 EP 199 DI 10.1006/jsbi.1993.1049 PG 10 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA NG948 UT WOS:A1993NG94800003 PM 8003380 ER PT J AU CHENG, FY MERTZ, GE SHEU, MS GER, JF AF CHENG, FY MERTZ, GE SHEU, MS GER, JF TI COMPUTED VERSUS OBSERVED INELASTIC SEISMIC LOW-RISE RC SHEAR WALLS SO JOURNAL OF STRUCTURAL ENGINEERING-ASCE LA English DT Article AB A technique of calculating inelastic deformation of low-rise shear walls having height-width ratios of 0.5 and 0.75 without boundary elements is presented with consideration of the coupling effect for bending and shear deformations as well as the deformation due to base rotation. An interaction surface of moment, shear, and curvature or moment, shear, and shear strain is developed. The deflections at crack, yield, and ultimate loadings can be calculated separately from bending and shear deformations, which are compared favorably with experimental results. The shear deformation is significant for the low-rise walls studied because the deformation due to bending deformation is about 40-60% of the total deformation after the walls have reached 20% of ultimate deformation. The hysteresis rules are developed for both bending and shear deformations on the basis of theoretical and experimental studies. Favorable comparisons between the calculated and experimental responses were observed for individual walls and a low-rise two-story building on a shaking-table test. A computer program was developed for structural system analysis subjected to seismic excitations C1 WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECH CTR,AIKEN,SC 29808. NATL CHENG KUNG UNIV,DEPT ARCH ENGN,TAINAN,TAIWAN. RP CHENG, FY (reprint author), UNIV MISSOURI,DEPT CIVIL ENGN,ROLLA,MO 65401, USA. NR 22 TC 8 Z9 8 U1 0 U2 1 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9445 J9 J STRUCT ENG-ASCE JI J. Struct. Eng.-ASCE PD NOV PY 1993 VL 119 IS 11 BP 3255 EP 3275 DI 10.1061/(ASCE)0733-9445(1993)119:11(3255) PG 21 WC Construction & Building Technology; Engineering, Civil SC Construction & Building Technology; Engineering GA MD135 UT WOS:A1993MD13500009 ER PT J AU LEWIS, MA FISCHER, DF SMITH, LJ AF LEWIS, MA FISCHER, DF SMITH, LJ TI SALT-OCCLUDED ZEOLITES AS AN IMMOBILIZATION MATRIX FOR CHLORIDE WASTE SALT SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article AB The pyrometallurgical processing of spent fuel from the integral fast reactor (IFR), an advanced reactor under development at Argonne National Laboratory, will generate a chloride salt waste containing the alkali-metal, alka-line-earth, and some of the rare-earth fission products. Salt-occluded zeolite A, formed by equilibrating simulated molten waste salt and zeolite A, has been investigated as an immobilization matrix for this salt waste. In this concept, the chloride waste salt is loaded into the zeolite cavities, and cesium and strontium from the salt are preferentially sorbed by the zeolite. Experiments showed that the salt-occluded zeolite powders are leach resistant and radiation stable. The conclusion is that the salt-occluded zeolite is a promising immobilization matrix for the IFR waste salt. RP LEWIS, MA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 24 TC 51 Z9 51 U1 0 U2 7 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD NOV PY 1993 VL 76 IS 11 BP 2826 EP 2832 DI 10.1111/j.1151-2916.1993.tb04023.x PG 7 WC Materials Science, Ceramics SC Materials Science GA MG319 UT WOS:A1993MG31900017 ER PT J AU KIM, DJ BECHER, PF HUBBARD, CR AF KIM, DJ BECHER, PF HUBBARD, CR TI EFFECT OF NB2O5 ALLOYING ON THERMAL-EXPANSION ANISOTROPY OF 2 MOL-PERCENT Y2O3-STABILIZED TETRAGONAL ZRO2 SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID MARTENSITIC-TRANSFORMATION; FRACTURE-TOUGHNESS; ZIRCONIA; TEMPERATURE AB Tetragonal ZrO2 (t-ZrO2) solid solutions were prepared with additions of 2 mol% Y2O3 plus up to 0.45 mol% Nb2O5. The thermal expansion coefficients in both the a- and c-axis lattice directions increased with Nb2O5 alloying and the thermal expansion in the c-axis direction was greater than that in the a-axis direction over the entire composition range. This anisotropic thermal expansion behavior was related to the 4-fold coordination of Nb5+ with oxygen ions in t-ZrO2, solid solutions in the system ZrO2-Y2O3-Nb2O5. The fracture toughness continuously increased with Nb2O5 alloying and suggested that the c/a axial ratio is a more significant factor than the internal stress that arises from the thermal expansion anisotropy, in the determination of the transformability of t-ZrO2 in this system. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP KIM, DJ (reprint author), KOREA INST SCI & TECHNOL,DIV CERAM,SEOUL 136791,SOUTH KOREA. NR 26 TC 10 Z9 10 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD NOV PY 1993 VL 76 IS 11 BP 2904 EP 2908 DI 10.1111/j.1151-2916.1993.tb04035.x PG 5 WC Materials Science, Ceramics SC Materials Science GA MG319 UT WOS:A1993MG31900029 ER PT J AU WERESZCZAK, AA BREDER, K FERBER, MK AF WERESZCZAK, AA BREDER, K FERBER, MK TI ROLE OF OXIDATION IN THE TIME-DEPENDENT FAILURE BEHAVIOR OF HOT ISOSTATICALLY PRESSED SILICON-NITRIDE AT 1370-DEGREES-C SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID CREEP AB Dynamic fatigue studies were conducted on a hot isostatically pressed silicon nitride in ambient air and inert (argon or nitrogen) environments using four-point flexure at 1370-degrees-C. Specimens tested in ambient air exhibited a stressing rate dependence with decreased flexure strength with decreased stressing rates. All fracture surfaces of specimens tested in ambient air possessed a sweeping stress-oxidation damage zone that originated at the tensile side of each bend bar. In addition to this stress-oxidation damage, creep damage (e.g., cavitation) was concurrently observed in the specimens tested at the slower stressing rates, which appeared to further weaken the material. However, tests conducted in argon or nitrogen revealed flexure strength to be independent of the stressing rate. Creep damage was present at the slower stressing rates, but no stress-oxidation damage was evident similar to that observed on the specimens tested in ambient air. By decoupling the effects of oxidation and creep, it was evident that the former contributed to the formation of a detrimental stress-oxidation damage zone which significantly reduced the strength of this material at 1370-degrees-C. RP WERESZCZAK, AA (reprint author), OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831, USA. RI Wereszczak, Andrew/I-7310-2016 OI Wereszczak, Andrew/0000-0002-8344-092X NR 7 TC 25 Z9 26 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD NOV PY 1993 VL 76 IS 11 BP 2919 EP 2922 DI 10.1111/j.1151-2916.1993.tb04039.x PG 4 WC Materials Science, Ceramics SC Materials Science GA MG319 UT WOS:A1993MG31900033 ER PT J AU RYE, R ARNOLD, GW RICCO, AJ AF RYE, R ARNOLD, GW RICCO, AJ TI CHARACTERIZATION OF THE COPPER-POLY(TETRAFLUOROETHYLENE) INTERFACE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID POLY(TETRAFLUOROETHYLENE); RADIATION; POLYTETRAFLUOROETHYLENE; DEPOSITION; COMPLEXES; COPPER AB Using Rutherford backscattering spectroscopy (RBS) and x-ray photoelectron spectroscopy (XPS), we have shown that strong adhesion of electrolessly deposited Cu to etched poly(tetrafluoroethylene) (PTFE) results from penetration of all species (tin oxide from the sensitization step, Pd from the nucleation step, and electrolessly deposited Cu) into the porous, carbon-rich, 3000 angstrom-deep chemically etched layer. Measurements of the deposited Cu films show a yield strength comparable to commercial Cu-clad PTFE. XPS analysis of both failure surfaces show only C(1s) and F(1s) peaks characteristic of virgin PTFE with a small amount of the C(1s) peak characteristic of etched PTFE. Near-cohesive failure occurs at a depth into the etched layer where bulk PTFE characteristics are approached but at depths greater than those shown from RBS depth profiles to be accessible to Cu penetration. Line-of -sight thermal evaporation of Cu yields Cu RBS depth profiles that are identical to those obtained from electrolessly deposited (isotropic) Cu, suggesting that the structure of the PTFE pores into which the Cu mechanically interlocks is very open, with few convolutions. RP RYE, R (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Ricco, Antonio/A-5273-2010 NR 20 TC 15 Z9 15 U1 0 U2 1 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD NOV PY 1993 VL 140 IS 11 BP 3233 EP 3239 DI 10.1149/1.2221016 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA MG873 UT WOS:A1993MG87300037 ER PT J AU PAYNE, AN AF PAYNE, AN TI EFFICIENT APPROXIMATE REPRESENTATION OF BI-OBJECTIVE TRADEOFF SETS SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article AB The problem of efficiently approximating the tradeoff (Pareto-optimal) curve or set for optimization problems with two conflicting objectives is considered. In particular, a new method is proposed for computing a relatively small number of points to define an approximate representation of the tradeoff set. The efficiency of the method is established by showing the maximum number of points required to achieve a prescribed precision of approximation. Finally, a general algorithm embodying the method is outlined and analysed. RP PAYNE, AN (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT ELECTR ENGN,LIVERMORE,CA 94550, USA. NR 5 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-0032 J9 J FRANKLIN I JI J. Frankl. Inst.-Eng. Appl. Math. PD NOV PY 1993 VL 330 IS 6 BP 1219 EP 1233 DI 10.1016/0016-0032(93)90073-4 PG 15 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA ME933 UT WOS:A1993ME93300013 ER PT J AU ROGERS, JD AF ROGERS, JD TI TESTING IN COMBINED DYNAMIC ENVIRONMENTS SO JOURNAL OF THE IES LA English DT Article DE VIBRATION; ACOUSTICS; CENTRIFUGES; TESTING; ENVIRONMENTS AB The combined dynamic environments of vibration and linear acceleration are common to a large number of spacecraft components and other devices. Testing such devices has normally been a two-step process in which independent vibration and centrifuge tests are performed. There is a concern that the combined effects from these two dynamic environments could cause unexpected operational failures that were not predicted from either analysis or independent testing. This paper describes the design and performance of a testing facility that combines vibration and centrifuge testing in a single operation. The test facility is called the Vibrafuge and utilizes Sandia National Laboratories' (SNL) 29-ft underground centrifuge with an attached electrodynamic shaker. Also addressed are activities underway at SNL on development of a combined vibration and acoustic test facility (ATF). RP ROGERS, JD (reprint author), SANDIA NATL LABS,DEPT NEW INITIAT,ALBUQUERQUE,NM, USA. NR 0 TC 1 Z9 2 U1 1 U2 1 PU INST ENVIRONMENTAL SCI PI MT PROSPECT PA 940 E NORTHWEST HIGHWAY, MT PROSPECT, IL 60056 SN 1052-2883 J9 J IES JI J. IES PD NOV-DEC PY 1993 VL 36 IS 6 BP 19 EP 25 PG 7 WC Engineering, Environmental; Environmental Sciences; Instruments & Instrumentation SC Engineering; Environmental Sciences & Ecology; Instruments & Instrumentation GA MP950 UT WOS:A1993MP95000003 ER PT J AU WORDEN, EF CARLSON, LR JOHNSON, SA PAISNER, JA SOLARZ, RW AF WORDEN, EF CARLSON, LR JOHNSON, SA PAISNER, JA SOLARZ, RW TI IONIZATION-POTENTIAL OF NEUTRAL ATOMIC PLUTONIUM DETERMINED BY LASER SPECTROSCOPY SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID DOUBLE-RESONANCE; ENERGY-LEVELS; URANIUM; PHOTOIONIZATION; LIFETIMES; ACTINIDES; IRON AB The ionization potential of the neutral plutonium atom, Pu I, has been determined by two- and three-step resonance photoionization observation of the threshold of ionization and of Rydberg series. The Rydberg series were observed by field ionization as series that converge to the first ionization limit and as autoionizing series that converge to the second and to several higher convergence limits. The threshold and Rydberg series were obtained through a number of two- and three-step pathways. The photoionization threshold value for the Pu-239 I ionization potential is 48582(30) cm-1, and the more accurate value from the Rydberg series is 48 604(1) cm-1 or 6.0262(1) eV. RP WORDEN, EF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 19 TC 17 Z9 17 U1 1 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD NOV PY 1993 VL 10 IS 11 BP 1998 EP 2005 DI 10.1364/JOSAB.10.001998 PG 8 WC Optics SC Optics GA MF959 UT WOS:A1993MF95900004 ER PT J AU HARASHINA, H SHAMOTO, S KIYOKURA, T SATO, M KAKURAI, K SHIRANE, G AF HARASHINA, H SHAMOTO, S KIYOKURA, T SATO, M KAKURAI, K SHIRANE, G TI TEMPERATURE-DEPENDENCE OF THE MAGNETIC EXCITATION-SPECTRA OF YBA2CU2.9ZN0.1O6.75 SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article DE YBA2CU3O6+Y; HIGH-TC OXIDES; IMPURITY EFFECT MAGNETIC SPECTRA; ELECTRON LOCALIZATION, SPIN GAP ID NEUTRON-SCATTERING; SPIN FLUCTUATIONS; SINGLE-CRYSTALS; YBA2CU3O6+X; SUPERCONDUCTIVITY; DYNAMICS; SYSTEM; GROWTH AB Neutron scattering measurements of magnetic excitations in YBa2Cu2.9Zn0.1O6.75 (T(c) less-than-or-equal-to 10 K) have been performed. In contrast to the corresponding pure sample with the same oxygen number (T(c) congruent-to 66 K) where no peak of the antiferromagnetic correlation was detected for excitation energies below 15 meV, we have observed clear scattering contribution in the same energy range at all temperatures studied. A detailed study of chi''(omega) at (pi, pi) in this Zn-substituted sample suggests 1) an existence of the gap-like structure at high temperatures (100 K < T < 200 K) and 2) the enhancement of the spectral weight at low energies along with the loss of the itinerant nature of the electrons at low temperatures (T < 50 K). C1 UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP HARASHINA, H (reprint author), NAGOYA UNIV, FAC SCI, DEPT PHYS, CHIKUSA KU, NAGOYA 46401, JAPAN. NR 29 TC 26 Z9 26 U1 0 U2 0 PU PHYSICAL SOC JAPAN PI TOKYO PA YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD NOV PY 1993 VL 62 IS 11 BP 4009 EP 4015 DI 10.1143/JPSJ.62.4009 PG 7 WC Physics, Multidisciplinary SC Physics GA MH621 UT WOS:A1993MH62100037 ER PT J AU CAUGHMAN, JBO HOLBER, WM AF CAUGHMAN, JBO HOLBER, WM TI EFFECTS OF SUBSTRATE BIAS FREQUENCY IN AN ELECTRON-CYCLOTRON-RESONANCE PLASMA REACTOR SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID DISCHARGES; FIELD AB The effects of varying the substrate bias frequency on both substrate and plasma parameters have been studied in an electron cyclotron resonance plasma reactor. The frequency was varied between 13.56 and 76.0 MHz. The plasma density at the substrate was in the mid-10(11)/cm3 range. It was generally found that as the frequency was increased, less rf power was coupled to the ions accelerated across the sheath to the substrate, and more rf power was coupled to the plasma bulk. Thus, more power was needed to achieve the same self-bias voltage as the bias frequency was raised. The same trend was seen as the plasma density increased-i.e., more rf power was needed to achieve the desired self-bias voltage at higher densities. These effects are analyzed in terms of a simple sheath model of the reactor. C1 IBM CORP,DIV RES,TJ WATSON RES CTR,YORKTOWN HTS,NY 10598. RP CAUGHMAN, JBO (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Caughman, John/R-4889-2016 OI Caughman, John/0000-0002-0609-1164 NR 15 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD NOV-DEC PY 1993 VL 11 IS 6 BP 2897 EP 2902 DI 10.1116/1.578665 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA MG724 UT WOS:A1993MG72400003 ER PT J AU DOMANSKY, K PETELENZ, D JANATA, J AF DOMANSKY, K PETELENZ, D JANATA, J TI LIFT-OFF PROCESS FOR NOBLE-METALS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Note AB A two-layer lift-off process using aluminum and an inorganic dielectric for patterning noble metals is described. It produces a smoothly sloped metallization pattern and is compatible with the deposition temperatures up to 350-degrees-C. The metal layers can be deposited either by evaporation or by sputtering. It is particularly useful in applications requiring thick metallization. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP DOMANSKY, K (reprint author), UNIV UTAH, HEDCO MICROFABRICAT FACIL, SALT LAKE CITY, UT 84112 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2121 EP 2122 PG 2 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200026 ER PT J AU KIM, HS YU, ML STAUFER, U MURAY, LP KERN, DP CHANG, THP AF KIM, HS YU, ML STAUFER, U MURAY, LP KERN, DP CHANG, THP TI OXYGEN PROCESSED FIELD-EMISSION TIPS FOR MICROCOLUMN APPLICATIONS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID TUNNELING MICROSCOPE-MICROLENS; SYSTEMS AB An oxygen induced sharpening process of field emitter tips, W[111], for use in a scanning tunneling microscope aligned field emission microcolumn system has been developed. The sharpening process which depends on processing temperature and oxygen pressure can be used to control tip radius accurately with reliability and reproducibility. The measured tungsten removal rate was approximately 13 angstrom/min at a processing temperature of congruent-to 1650 K and at an oxygen pressure of congruent-to 4 X 10(-5) Torr. The process is primarily intended for more accurate control of the tip radius and hence performance of newly etched tips, although damaged or blunt tips can also be resharpened in situ with this process. Favorable emission characteristics of the oxygen processed tips have been observed with microcolumn operation: (1) reasonably stable emission current, (2) low extraction voltage, (3) reproducible threefold symmetric emission patterns, and (4) small emission angle. C1 UNIV BASEL,INST PHYS,CH-4056 BASEL,SWITZERLAND. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KIM, HS (reprint author), IBM CORP,DIV RES,T J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. RI Staufer, Urs/J-6866-2016 OI Staufer, Urs/0000-0002-3519-6467 NR 18 TC 30 Z9 30 U1 0 U2 1 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2327 EP 2331 DI 10.1116/1.586981 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200069 ER PT J AU FERRERA, J WONG, VV RISHTON, S BOEGLI, V ANDERSON, EH KERN, DP SMITH, HI AF FERRERA, J WONG, VV RISHTON, S BOEGLI, V ANDERSON, EH KERN, DP SMITH, HI TI SPATIAL-PHASE-LOCKED ELECTRON-BEAM LITHOGRAPHY - INITIAL TEST-RESULTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER AB Earlier spatial-phase-locked e-beam lithography (SPLEBL) was proposed as a means of eliminating the well-known problem of feature placement precision in scanning electron-beam lithography. In SPLEBL, a grid with long-range spatial-phase coherence is created on a substrate (or on top of its resist coating) and this grid is used to feedback information on beam location to the control system. In initial tests a standard deviation (sigma) of 0.3 nm for phase-locking precision in one dimension was demonstrated, which represents the finest field stitching ever obtained with any lithographic method. In two dimensions (2D), sigma(x), sigma(y) = 0.6, 0.4 nm was obtained. Moire spatial-phase locking was also demonstrated in 2D. Two strategies for the global-fiducial grid appear feasible: plating base modulation and a thin film of holographically exposed photoresist on thin-film Al above the e-beam resist. Either would permit spatial-phase locking without exposure of resist. C1 IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP FERRERA, J (reprint author), MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139, USA. NR 9 TC 34 Z9 35 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2342 EP 2345 DI 10.1116/1.586983 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200071 ER PT J AU UNGER, P BOEGLI, V BUCHMANN, P GERMANN, R AF UNGER, P BOEGLI, V BUCHMANN, P GERMANN, R TI FABRICATION OF CURVED MIRRORS FOR VISIBLE SEMICONDUCTOR-LASERS USING ELECTRON-BEAM LITHOGRAPHY AND CHEMICALLY ASSISTED ION-BEAM ETCHING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID UNSTABLE RESONATOR AB (Al)GaInP ridge-waveguide lasers with curved dry-etched mirrors have been fabricated which operate in the visible-light regime at a wavelength of 690 nm. High-resolution electron-beam lithography is used to define the mirror shapes in a 25 nm design grid while the rest of the fabrication technology is done conventionally by optical lithography. The mirror patterns are transferred into the underlying epitaxial layers by chemically assisted ion-beam etching. The properties of the laser devices are comparable to devices with cleaved facets. Single-mode behavior is observed up to cw output power levels of 30 mW. The horizontal far-field angle of the emitted light can be influenced by varying the curvature radius of the mirror facets. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP UNGER, P (reprint author), IBM CORP,DIV RES,ZURICH RES LAB,CH-8803 RUSCHLIKON,SWITZERLAND. NR 12 TC 7 Z9 7 U1 2 U2 2 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2514 EP 2518 DI 10.1116/1.586657 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200104 ER PT J AU KRASNOPEROVA, AA XIAO, J CERRINA, F DIFABRIZIO, E LUCIANI, L FIGLIOMENI, M GENTILI, M AF KRASNOPEROVA, AA XIAO, J CERRINA, F DIFABRIZIO, E LUCIANI, L FIGLIOMENI, M GENTILI, M TI FABRICATION OF HARD X-RAY PHASE ZONE-PLATE BY X-RAY-LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER AB Fresnel phase zone plates for hard x-ray microfocusing have been fabricated. An original x-ray mask written by e-beam lithography was replicated into thick PMMA by x-ray proximity printing. The pattern was transferred into gold and nickel by electroplating. A smallest linewidth of 0.25 mum with an aspect ratio of 14 in the metal pattern has been achieved. Thickness of fabricated zone plates was dictated by a pi-phase shift requirement for focusing of the x rays at 8 and 20 keV energies. C1 CNR IESS,I-00156 ROME,ITALY. ARGONNE NATL LAB,ARGONNE,IL 60439. RP KRASNOPEROVA, AA (reprint author), UNIV WISCONSIN,CTR X-RAY LITHOG,MADISON,WI 53589, USA. NR 14 TC 23 Z9 23 U1 0 U2 3 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2588 EP 2591 DI 10.1116/1.586630 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200120 ER PT J AU WENDT, JR VAWTER, GA GOURLEY, PL BRENNAN, TM HAMMONS, BE AF WENDT, JR VAWTER, GA GOURLEY, PL BRENNAN, TM HAMMONS, BE TI NANOFABRICATION OF PHOTONIC LATTICE STRUCTURES IN GAAS/ALGAAS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID PERIODIC DIELECTRIC STRUCTURES; BAND-STRUCTURE; EXISTENCE; GAPS AB The nanofabrication of two-dimensional photonic lattice structures in GaAs/AlGaAs is reported. The nanofabrication procedure combines direct-write electron-beam lithography and reactive-ion-beam etching to achieve etched features as small as 50 nm. The lattice comprises a hexagonal array of air cylinders etched into a semiconductor surface with a refractive index contrast of 3.54. A range of air volume fractions from 14% to 84% was investigated. The lithographic, masking, and etching processes necessary to fabricate the lattice are described along with practical limitations to achieving a lattice of arbitrary air volume fraction. Initial results from optical characterization of the lattice are also presented. RP WENDT, JR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 56 Z9 58 U1 1 U2 3 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2637 EP 2640 DI 10.1116/1.586641 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200131 ER PT J AU WHEELER, DR HUTTON, S STEIN, S BAIOCCHI, F CHENG, M TAYLOR, G AF WHEELER, DR HUTTON, S STEIN, S BAIOCCHI, F CHENG, M TAYLOR, G TI NEW SILICON-RICH SILYLATING REAGENTS FOR DRY-DEVELOPED POSITIVE-TONE DEEP-ULTRAVIOLET LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID RESIST PROCESS; POLYMERS AB Disilanes are used as silylating reagents for near-surface imaging with deep ultraviolet (248 nm) light. A relatively thin imaging layer of a photocross-linking resist is spun over a thicker layer of hard-baked resist which functions as a planarizing layer and antireflective coating. Photoinduced acid generation and subsequent heating cross-links exposed areas and renders them impermeable to an aminodisilane which reacts with the unexposed regions. Subsequent O2 reactive-ion etching affords a positive-tone image in the resist. The use of disilanes introduces a higher concentration of silicon into the polymer than is possible with silicon reagents that incorporate only one silicon atom per reactive site. The higher silicon content in the silylated polymer increases etching selectivity between exposed and unexposed regions and thereby increases the contrast. We have resolved high-aspect ratio, 0.25 mum line and space patterns with 248 nm light in a stepper with a numerical aperture=0.48. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP WHEELER, DR (reprint author), SANDIA NATL LABS,DEPT 1811,ALBUQUERQUE,NM 87185, USA. NR 22 TC 11 Z9 11 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2789 EP 2793 DI 10.1116/1.586603 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200158 ER PT J AU NGUYEN, KB NGUYEN, TD AF NGUYEN, KB NGUYEN, TD TI DEFECT COVERAGE PROFILE AND PROPAGATION OF ROUGHNESS OF SPUTTER-DEPOSITED MO/SI MULTILAYER COATING FOR EXTREME-ULTRAVIOLET PROJECTION LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID ATOMIC FORCE MICROSCOPY; FILM AB The presence of defects in multilayer reflective coatings to be used as mask blanks for extreme ultraviolet projection lithography can cause significant reduction in image intensity. The extent of the reduction depends on the size and position of the defects and also on the manner in which the deposition process covers the underlying defect. If the deposited film causes lateral propagation of defect geometry and does not reduce the step height, even a hundred angstrom-sized defect might cause an observable effect. However, if the deposition process can reduce the defects' height and does not increase their effective size, the effect of defects on image would be less severe. Atomic force microscopy and transmission electron microscopy was used to study multilayer coating deposition profiles over programmed defects. It was found that the step height and edge slope is significantly reduced after film deposition with small lateral propagation of defect geometry. Roughness of the evaporated programmed defects was significantly reduced by the multilayer deposition process. A 200 nm Si buffer layer deposited before multilayer mirror deposition further smooth out the small features. However it also increases the roughness over the initially smooth wafer, resulting in lower achievable multilayer coating reflectivity. RP NGUYEN, KB (reprint author), LAWRENCE BERKELEY LAB,CTR X-RAY OPT,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720, USA. NR 13 TC 9 Z9 9 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2964 EP 2970 DI 10.1116/1.586569 PG 7 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200188 ER PT J AU SPITZER, RC KAUFFMAN, RL ORZECHOWSKI, T PHILLION, DW CERJAN, C AF SPITZER, RC KAUFFMAN, RL ORZECHOWSKI, T PHILLION, DW CERJAN, C TI SOFT-X-RAY PRODUCTION FROM LASER-PRODUCED PLASMAS FOR LITHOGRAPHY APPLICATIONS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER AB Laser-produced plasmas are investigated as a source for soft x-ray projection lithography. The dependence of conversion efficiency on target material, intensity, wavelength, and pulse width is determined using absolutely calibrated detectors. Conversion efficiency greater than 1% into a 2.2 eV bandwidth is demonstrated for Sn targets, fulfilling the system source requirements. RP SPITZER, RC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 7 TC 43 Z9 43 U1 0 U2 5 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2986 EP 2989 DI 10.1116/1.586573 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200192 ER PT J AU ZAK, J YUAN, HP HO, M WOO, LK PORTER, MD AF ZAK, J YUAN, HP HO, M WOO, LK PORTER, MD TI THIOL-DERIVATIZED METALLOPORPHYRINS - MONOMOLECULAR FILMS FOR THE ELECTROCATALYTIC REDUCTION OF DIOXYGEN AT GOLD ELECTRODES SO LANGMUIR LA English DT Letter ID SELF-ASSEMBLED MONOLAYERS; OXYGEN REDUCTION; SURFACES; SPECTROSCOPY; PORPHYRIN; COMPLEXES; MONONUCLEAR; DESORPTION; INTERFACE; SUPPORTS AB This paper describes preliminary results in the design, construction, and characterization of cobalt(II) porphyrins derivatized with alkanethiol appendages. The use of the thiol appendages leads to the formation of a chemisorbed monolayer of the corresponding thiolate at gold electrodes. Our findings suggest that this approach may serve as a beginning for fabricating electrocatalytic monolayers with a preselected architecture through the manipulation of the number and location of the appendages. Voltammetric data indicate that monolayers from both I(Co) and II(Co) catalyze the two-electron reduction of O2 to H2O2. The monolayer from I(Co), however, has a lower electrocatalytic activity. Infrared, X-ray photoelectron, and visible spectroscopic data are presented that argue the difference in reactivity arises from a difference in interfacial architecture. The results from attempts to metalate monolayers from I(H-2) and II(H-2) support this interpretation. Findings are also reported that indicate the preparation of mixed monolayers (e.g., two-component monolayers from I(Co) and CH3(CH2)3SH) may prove valuable to this area of research. C1 SILESIAN TECH UNIV,DEPT CHEM,PL-44100 GLIWICE,POLAND. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP ZAK, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 32 TC 179 Z9 185 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD NOV PY 1993 VL 9 IS 11 BP 2772 EP 2774 DI 10.1021/la00035a006 PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MH664 UT WOS:A1993MH66400006 ER PT J AU BURTON, HD AF BURTON, HD TI INFOCULTURE - THE SMITHSONIAN BOOK OF INFORMATION AGE INVENTIONS - LUBAR,S SO LIBRARY JOURNAL LA English DT Book Review RP BURTON, HD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BOWKER MAGAZINE GROUP CAHNERS MAGAZINE DIVISION PI NEW YORK PA 249 W 17TH ST, NEW YORK, NY 10011 SN 0363-0277 J9 LIBR J JI Libr. J. PD NOV 1 PY 1993 VL 118 IS 18 BP 144 EP & PG 0 WC Information Science & Library Science SC Information Science & Library Science GA ME965 UT WOS:A1993ME96500276 ER PT J AU MALO, D GROS, P BERGMANN, A TRASK, B MOHRENWEISER, HW CANFIELD, VA LEVENSON, R AF MALO, D GROS, P BERGMANN, A TRASK, B MOHRENWEISER, HW CANFIELD, VA LEVENSON, R TI GENES ENCODING THE H,K-ATPASE-ALPHA AND NA,K-ATPASE-ALPHA-3 SUBUNITS ARE LINKED ON MOUSE CHROMOSOME-7 AND HUMAN CHROMOSOME-19 SO MAMMALIAN GENOME LA English DT Article ID FLUORESCENCE INSITU HYBRIDIZATION; BETA-SUBUNIT; ALPHA-SUBUNIT; DIFFERENTIAL EXPRESSION; COSMID CONTIGS; GASTRIC (H+; K+-ATPASE; LINKAGE; FAMILY; SEQUENCE AB We have used linkage analysis and fluorescence in situ hybridization to determine the chromosomal organization and location of the mouse (Atp4a) and human (ATP4A) genes encoding the H,K-ATPase a subunit. Linkage analysis in recombinant inbred (BXD) strains of mice localized Atp4a to mouse Chromosome (Chr) 7. Segregation of restriction fragment length polymorphisms in backcross progeny of Mus musculus x Mus spretus mating confirmed this assignment and indicates that Atp4a and Atp1a3 (gene encoding the murine Na,K-ATPase alpha3 subunit) are linked and separated by a distance of approximately 2 cM. Analysis of the segregation of simple sequence repeats suggested the gene order centromere-D7Mit21-D7Mit57/ Atp1a3-D7Mit72/Atp4a. A human Chr 19-enriched cosmid library was screened with both H,K-ATPase a and Na,K-ATPase alpha3 subunit cDNA probes to isolate the corresponding human genes (ATP4A and ATP1A3, respectively). Fluorescence in situ hybridization with gene-specific cosmid clones localized ATP4A to the q13.1 region, and proximal to ATP1A3, which maps to the q13.2 region, of Chr 19. These results indicate that ATP4A and ATP1A3 are linked in both the mouse and human genomes. C1 MCGILL UNIV,DEPT BIOCHEM,MONTREAL H3G 1Y6,QUEBEC,CANADA. LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,CTR HUMAN GENOME,LIVERMORE,CA 94550. FU NCI NIH HHS [CA-38992]; NHGRI NIH HHS [HG-00256]; NHLBI NIH HHS [HL-39263] NR 32 TC 9 Z9 9 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0938-8990 J9 MAMM GENOME JI Mamm. Genome PD NOV PY 1993 VL 4 IS 11 BP 644 EP 649 DI 10.1007/BF00360901 PG 6 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA MF574 UT WOS:A1993MF57400004 PM 7904196 ER PT J AU LEE, SH MALONE, C KEMP, PF AF LEE, SH MALONE, C KEMP, PF TI USE OF MULTIPLE 16S RIBOSOMAL-RNA-TARGETED FLUORESCENT-PROBES TO INCREASE SIGNAL STRENGTH AND MEASURE CELLULAR RNA FROM NATURAL PLANKTONIC BACTERIA SO MARINE ECOLOGY PROGRESS SERIES LA English DT Note ID RIBOSOMAL-RNA; OLIGODEOXYNUCLEOTIDE PROBES; OLIGONUCLEOTIDE PROBES; PHYLOGENETIC ANALYSIS; IDENTIFICATION; CELLS; INSITU; BACTERIOPLANKTON; HYBRIDIZATION; LEVEL AB Fluorescent oligonucleotide probes can be used to identify bacterial cells by hybridizing to specific rRNA sequences that are unique to a taxon. It has been suggested that single-cell RNA content could be estimated from the resulting cell fluorescence, which is directly proportional to rRNA content. However, this possibility was never assessed quantitatively for use in field studies, where most natural bacteria, due to their small size and slow growth, do not have enough rRNA to yield sufficient fluorescence for detection. One approach for increasing the fluorescence per rRNA molecule is the use of multiple probes targeted to independent sites in the rRNA molecule. In this study, we hybridized multiple probes (3 universal and 4 bacterial) to cultured marine bacterial isolates, and to natural bacterial assemblages from coastal water. For 5 of the 7 probes (2 probes did not hybridize to some of the isolates), cell fluorescence increased linearly with the number of probes hybridized. The natural bacterial assemblages showed an asymptotic increase of the probe-labeled fraction from ca 20% (1 probe) to 75% (5 probes) of the total population. The estimated detection limit was 0.3 fg RNA cell-1 with 5 probes. RNA contents estimated from the fluorescence of probe-labeled cells agreed well to those determined separately by ethidium bromide fluorometry (differed by average 16%, n = 3). Calibration of the photometer against fluorescence standards was critical for accurate measurements and comparisons. C1 BROOKHAVEN NATL LAB, DIV OCEANOG & ATMOSPHER SCI, UPTON, NY 11973 USA. ALBERTSON COLL IDAHO, DEPT BIOL, CALDWELL, ID 83605 USA. RI Kemp, Paul/G-2291-2011 OI Kemp, Paul/0000-0001-8947-4349 NR 23 TC 120 Z9 125 U1 3 U2 12 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0171-8630 J9 MAR ECOL PROG SER JI Mar. Ecol.-Prog. Ser. PD NOV PY 1993 VL 101 IS 1-2 BP 193 EP 201 DI 10.3354/meps101193 PG 9 WC Ecology; Marine & Freshwater Biology; Oceanography SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography GA ME437 UT WOS:A1993ME43700020 ER PT J AU KAUFMAN, DY LANAGAN, MT BALLEN, TA DORRIS, SE DAWLEY, JT POEPPEL, RB AF KAUFMAN, DY LANAGAN, MT BALLEN, TA DORRIS, SE DAWLEY, JT POEPPEL, RB TI BI-RICH BI-PB-SR-CA-CU-O (2-2-2-3) SUPERCONDUCTING TAPES SO MATERIALS LETTERS LA English DT Article AB The microstructural and electrical properties of Ag clad BiyPb0.4Sr2Ca2Cu3Ox (y=1.8, 2.0 and 2.3) powder-in-tube tapes were investigated. The highest J(c) values (2000 A/cm(2) at 77 K and 0 T) were obtained for tapes of powders y=1.8 and 2.0 following a 150 h thermomechanical routine at 855 degrees C. The presence of alkaline earth second phases was not diminished by the addition of bismuth. The phase equilibria were observed to shift from 2-2-2-3+Sr14-xCaxCu24O48+SrxCa2-xCuO3 to 2-2-2-3 +SrxCa2-xCuO3+CuO as the Bi content was increased from y=1.8 to 2.0. (Sr,Ca)(2)PbO4 and 2-2-1-2 were present as by-product phases at temperatures above and below 855 degrees C. Higher Pi content (y=2.3) caused formation of the 2-2-1-2 phase as the 2-2-2-3 became Bi-saturated. RP KAUFMAN, DY (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. 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 0167-577X J9 MATER LETT JI Mater. Lett. PD NOV PY 1993 VL 18 IS 1-2 BP 1 EP 4 DI 10.1016/0167-577X(93)90045-Y PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MJ859 UT WOS:A1993MJ85900001 ER PT J AU KINGSLEY, JJ PEDERSON, LR AF KINGSLEY, JJ PEDERSON, LR TI COMBUSTION SYNTHESIS OF PEROVSKITE LNCRO(3) POWDERS USING AMMONIUM DICHROMATE SO MATERIALS LETTERS LA English DT Article ID OXIDE AB Fine-particle LnCrO(3) perovskites, where Ln=rare earths, have been prepared by the exothermic redox decomposition of ammonium dichromate, lanthanum nitrate and glycine mixtures. The self-redox decomposition of ammonium dichromate enabled LnCrO(3) to be formed by combustion synthesis using less glycine than mixtures containing chromium nitrate. Autoignition temperatures for precursor mixtures containing ammonium dichromate were lower than those containing chromium nitrate (<170 degrees C versus 180 to 210 degrees C, respectively). Ammonium dichromate-containing precursors combusted at lower temperatures and produced powders having higher surface areas than precursor solutions containing chromium nitrate. RP KINGSLEY, JJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 22 TC 82 Z9 84 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD NOV PY 1993 VL 18 IS 1-2 BP 89 EP 96 DI 10.1016/0167-577X(93)90063-4 PG 8 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MJ859 UT WOS:A1993MJ85900019 ER PT J AU HONG, SI GRAY, GT VECCHIO, KS AF HONG, SI GRAY, GT VECCHIO, KS TI QUENCHING AND THERMAL CYCLING EFFECTS IN A 1060-AL MATRIX-10VOL-PERCENT-AL2O3 PARTICULATE-REINFORCED METAL-MATRIX COMPOSITE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID STRENGTHENING MECHANISMS; SIC COMPOSITE; SHORT FIBER AB In this study, the effects of quenching and thermal cycling on a 1060-Al matrix-10vol.%Al2O3 particulate reinforced composite were investigated. A rapid increase in the flow stress with increasing quenching temperature was found to result from solution hardening of the matrix due to solutionizing of reaction products and impurities. The matrix chemistry plays an important role in the strengthening of commercially pure Al matrix composites, although the effect of impurities or alloying elements is usually considered to be insignificant in commercially pure aluminum. The cooling rate was found to have no significant influence on the density of dislocations generated by the mismatch in thermal expansion coefficient. Dislocations were observed to be more homogeneously distributed near interface regions compared with matrix regions well away from particles. The dislocations punched out from the interface are thought to be distributed rather randomly so as to screen the thermal residual stress developed by the mismatch in thermal expansion coefficient. Thermal cycling of the composite was found to promote the formation of more stable dislocation tangles and cells. C1 UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,LA JOLLA,CA 92093. RP HONG, SI (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. RI Vecchio, Kenneth/F-6300-2011 OI Vecchio, Kenneth/0000-0003-0217-6803 NR 28 TC 9 Z9 9 U1 0 U2 4 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 1 PY 1993 VL 171 IS 1-2 BP 181 EP 189 PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA ME439 UT WOS:A1993ME43900019 ER PT J AU FAULKNER, RG WAITE, NC LITTLE, EA MORGAN, TS AF FAULKNER, RG WAITE, NC LITTLE, EA MORGAN, TS TI RADIATION-INDUCED GRAIN-BOUNDARY SEGREGATION IN DILUTE ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID METALS; IRRADIATION; SURFACES AB An innovative analytical model of radiation-induced segregation (RIS) in dilute alloys is presented. The approach is based on non-equilibrium segregation theory and can be extended to cover a multiplicity of sink types in a wide variety of metallic matrices. The model circumvents the requirement for complex mathematical procedures inherent in current rate theory analyses of RIS. Calculations are made for nickel segregation to grain boundaries in alpha-Fe and gamma-Fe and for zinc segregation in silver. Adequate fits between the limited available experimental surface segregation data and the model predictions are obtained. The analysis is used to deduce trends in grain boundary segregation in austenitic and ferritic steels to provide insight into materials selection for nuclear plants to meet requirements for minimal RIS. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. HARWELL LAB,DIV MAT & CHEM,DIDCOT OX11 0RA,OXON,ENGLAND. RP FAULKNER, RG (reprint author), LOUGHBOROUGH UNIV TECHNOL,INST POLYMER TECHNOL & MAT ENGN,LOUGHBOROUGH LE11 3TU,LEICS,ENGLAND. NR 29 TC 24 Z9 24 U1 2 U2 8 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 1 PY 1993 VL 171 IS 1-2 BP 241 EP 248 DI 10.1016/0921-5093(93)90411-7 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA ME439 UT WOS:A1993ME43900025 ER PT J AU GARNER, FA GREENWOOD, LR AF GARNER, FA GREENWOOD, LR TI RECENT PROGRESS IN FUSION-REACTOR MATERIALS STUDIES - FOCUS ON TRANSMUTATION AND RADIOACTIVATION ASPECTS SO MATERIALS TRANSACTIONS JIM LA English DT Review DE NEUTRON IRRADIATION; HELIUM; SOLID TRANSMUTATION; RADIOACTIVATION; FISSION-FUSION CORRELATION; VOID SWELLING; IRRADIATION CREEP; EMBRITTLEMENT ID AUSTENITIC STAINLESS-STEELS; STRENGTHENED COPPER-ALLOYS; CR-NI ALLOYS; NEUTRON-IRRADIATION; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EXAMINATION; VANADIUM ALLOYS; HELIUM; EVOLUTION; CREEP AB A review is presented of recent progress attained in the understanding of the influence of transmutation on the development of fusion-relevant property change data. It is shown that early experiments on helium effects on void swelling, irradiation creep and tensile properties of austenitic stainless steels were often misleading, and the influence of helium is much smaller than originally expected. Similar definitive conclusions concerning the role of helium in ferritic steels, copper alloys, and vanadium alloys cannot be drawn at this time. It is also shown, however, that the formation of solid transmutants can be very important in a number of alloy systems, especially for some of those proposed as reduced radioactivation candidates. RP GARNER, FA (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Greenwood, Lawrence/H-9539-2016 OI Greenwood, Lawrence/0000-0001-6563-0650 NR 65 TC 8 Z9 8 U1 2 U2 9 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD NOV PY 1993 VL 34 IS 11 BP 985 EP 998 PG 14 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MP111 UT WOS:A1993MP11100002 ER PT J AU KOHNO, Y KOHYAMA, A GELLES, DS ASAKURA, K AF KOHNO, Y KOHYAMA, A GELLES, DS ASAKURA, K TI RADIATION-INDUCED MICROSTRUCTURAL EVOLUTION IN FERRITIC MARTENSITIC STEELS SO MATERIALS TRANSACTIONS JIM LA English DT Article DE FERRITIC/MARTENSITIC STEEL; MARTENSITIC STEEL; LOW ACTIVATION STEEL; MICROSTRUCTURAL EVOLUTION; VOID SWELLING; PHASE STABILITY; RADIATION INDUCED PRECIPITATE; FAST FLUX TEST FACILITY/MATERIALS OPEN TEST ASSEMBLY (FFTF/MOTA) ID CHARGED-PARTICLE IRRADIATION; FERRITIC STEELS AB R & D of ferritic/martensitic steels as structural materials for fusion reactor is one of the most important issues of fusion technology. The efforts to characterize microstructural evolution under irradiation in the conventional Fe-Cr-Mo steels as well as newly developed Fe-Cr-Mn or Fe-Cr-W low activation ferritic/martensitic steels have been continued. This paper provides some of the recent results of heavy irradiation effects on the microstructural evolution of ferritic/martensitic steels neutron irradiated in the FFTF/MOTA (Fast Flux Test Facility/ Materials Open Test Assembly). Materials examined are Fe-10Cr-2Mo dual phase steel (JFMS: Japanese Ferritic/Martensitic Steel), Fe-12Cr-XMn-1Mo manganese stabilized martensitic steels and Fe-8Cr-2W tungsten stabilized low activation martensitic steel (F82H). JFMS showed excellent void swelling resistance similar to 12Cr martensitic steel such as HT-9, while the manganese stabilized steels and F82H showed less void swelling resistance with small amount of void swelling at 640-700 K (F82H: 0.14% at 678 K). As for irradiation response of precipitate behavior, significant formation of intermetallic chi phase was observed in the manganese stabilized steels along grain boundaries which is thought to cause mechanical property degradation. On the other hand, precipitates identified were the same type as those in unirradiated condition in F82H with no recognition of irradiation induced precipitates, which suggested satisfactory mechanical properties of F82H after the irradiation. C1 PACIFIC NW LAB, DEPT MAT SCI, RICHLAND, WA 99352 USA. RP KOHNO, Y (reprint author), UNIV TOKYO, DEPT MAT SCI, BUNKYO KU, TOKYO, TOKYO 113, JAPAN. NR 35 TC 6 Z9 6 U1 2 U2 9 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD NOV PY 1993 VL 34 IS 11 BP 1018 EP 1026 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MP111 UT WOS:A1993MP11100006 ER PT J AU OHNUKI, S GARNER, FA TAKAHASHI, H AF OHNUKI, S GARNER, FA TAKAHASHI, H TI PHASE INSTABILITY AND VOID FORMATION IN NEUTRON-IRRADIATED FE-CR-MN-NI ALLOYS SO MATERIALS TRANSACTIONS JIM LA English DT Article DE LOW ACTIVATION; IRON-CHROMIUM-MANGANESE STEEL; VOID FORMATION; PHASE INSTABILITY; RADIATION-INDUCED SEGREGATION; SIGMA PHASE ID STEELS AB A series of Fe-13Cr-15Mn alloys with different nickel levels of 0-15% have been examined by transmission electron microscopy and X-ray microanalysis following irradiation to 17-25 dpa at 693-823 K. All specimens were found to have developed typical features of radiation damage at high temperature; voids, dislocations and second phases. Both void formation and radiation-induced phase instability were found to be strongly dependent on nickel content. The ferrite phase was observed to form at grain boundaries in alloys with zero or low nickel content. Sigma phase often formed at the boundary between the ferrite and austenite phases. With increasing nickel content, both ferrite and sigma phase formation were suppressed. The induced density change was also found to be sensitive to the nickel content. The phase instability and density change during irradiation was explained in terms of radiation-induced solute segregation and formation of lower swelling phases. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP OHNUKI, S (reprint author), HOKKAIDO UNIV, FAC ENGN, SAPPORO, HOKKAIDO 060, JAPAN. NR 16 TC 1 Z9 1 U1 2 U2 7 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD NOV PY 1993 VL 34 IS 11 BP 1031 EP 1035 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MP111 UT WOS:A1993MP11100008 ER PT J AU KIMURA, A GELLES, DS KOHYAMA, A PUIGH, RJ AF KIMURA, A GELLES, DS KOHYAMA, A PUIGH, RJ TI DIMENSIONAL CHANGES AND MICROSTRUCTURE OF IN-PILE CREPT FERRITIC-MARTENSITIC STEEL SO MATERIALS TRANSACTIONS JIM LA English DT Article DE PRESSURIZED TUBE; IRRADIATION CREEP MECHANISM; ANISOTROPY IN BURGERS VECTOR; G PHASE; FERRITIC-MARTENSITIC STEEL ID IRRADIATION; PHASES AB Pressurized tube specimens of Japanese Ferritic-Martensitic Steel (JFMS) were irradiated in Fast Flux Test Facility (FFTF) Materials Open Test Assembly (MOTA) to 37.5 dpa at 680 and 793 K. Diametral creep strain following irradiation at 680 K was 0.11% even at zero hoop stress and slightly increased with increasing the hoop stress. The creep strain following irradiation at 793 K increased from zero to 0.23% with the increase in hoop stress from zero to 86 MPa. As for the void swelling, nothing was recognized. The martensitic phase in JFMS was stable after the irradiation at 680 K, but this was not the case at 793 K where a considerable recovery of dislocation structures was found. Following irradiation at 680 K, a high density of fine spherical G phase precipitates which were accompanied by the strain fields around them were observed, while large Mo-rich Laves phase particles were observed following irradiation at 793 K. Analysis of dislocation Burgers vectors revealed that dislocations having Burgers vector of type a[100] were observed only after the irradiation at 680 K and that a large anisotropy was indicated in a[100] type of Burgers vector populations for a stressed specimen, but no significant anisotropy was observed in the Burgers vectors of a specimen irradiated without hoop stress. The average diameter of small precipitates in the specimen irradiated at 680 K under stress was significantly larger than that without stress. Finally, the observed dimensional changes were attributed to both the precipitation-induced volume expansion and the Stress-Induced Preferential Absorption (SIPA) irradiation creep for 680 K irradiation and Climb-Controlled Glide (CCG) irradiation creep at 793 K. C1 MURORAN INST TECHNOL, MURORAN, HOKKAIDO 050, JAPAN. PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV TOKYO, BUNKYO KU, TOKYO, TOKYO 113, JAPAN. WESTINGHOUSE HANFORD CO, RICHLAND, WA 99352 USA. NR 20 TC 3 Z9 3 U1 0 U2 1 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD NOV PY 1993 VL 34 IS 11 BP 1069 EP 1075 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MP111 UT WOS:A1993MP11100013 ER PT J AU ABE, K MASUYAMA, T SATOU, M HAMILTON, ML AF ABE, K MASUYAMA, T SATOU, M HAMILTON, ML TI NEUTRON-IRRADIATION DAMAGE AND VOID LATTICE FORMATION IN A MOLYBDENUM ALLOY TZM SO MATERIALS TRANSACTIONS JIM LA English DT Article DE MOLYBDENUM; FUSION REACTOR MATERIALS; HIGH HEAT FLUX MATERIALS; SWELLING; VOID LATTICE; NEUTRON IRRADIATION DAMAGE ID FLUENCE AB Molybdenum alloys are candidate materials for high heat flux components of fusion reactors. In order to study the neutron irradiation damage at high fluence levels, disks of the molybdenum alloy TZM that had been stress relieved at 1199 K for 0.9 ks were irradiated in the FFTF/MOTA at 679, 793 and 873 K to a neutron fluence of 9.6 x 10(26) n/m(2) (E(n)>0.1 MeV). Defect microstructures were observed by transmission electron microscopy. Dislocation structures consisted of isolated loops, aggregated loops (rafts) and elongated dislocations. The size of the loops increased with the irradiation temperature. The levels of void swelling were 0.68 and 1.6% at 793 and 873 K, respectively. A void lattice was developed in the body-centered-cubic (b.c.c.) structure with a lattice spacing of 28 nm. The fine grain size (0.5-2 mu m) was retained following high-temperature irradiation, indicating that the stress relief heat treatment may extend the material's resistance to irradiation damage up to high fluence levels. The relationship between the microstructure and irradiation hardening was determined. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP ABE, K (reprint author), TOHOKU UNIV, DEPT NUCL ENGN, AOBA KU, ARAMAKI AZA AOBA, SENDAI 980, JAPAN. NR 14 TC 11 Z9 11 U1 0 U2 3 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD NOV PY 1993 VL 34 IS 11 BP 1137 EP 1142 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MP111 UT WOS:A1993MP11100022 ER PT J AU ANDREWS, HW IVANOVIC, M WEBER, DA AF ANDREWS, HW IVANOVIC, M WEBER, DA TI PSEUDORADIOACTIVE EQUILIBRIUM SO MEDICAL PHYSICS LA English DT Letter C1 BROOKHAVEN NATL LAB,DIV NUCL MED,UPTON,NY 11973. NR 10 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0094-2405 J9 MED PHYS JI Med. Phys. PD NOV-DEC PY 1993 VL 20 IS 6 BP 1757 EP 1757 DI 10.1118/1.596966 PG 1 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MJ007 UT WOS:A1993MJ00700023 ER PT J AU SCHNEIBEL, JH AGNEW, SR CARMICHAEL, CA AF SCHNEIBEL, JH AGNEW, SR CARMICHAEL, CA TI SURFACE PREPARATION AND BEND-DUCTILITY OF NIAL SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Note ID BEHAVIOR; STRENGTH; TENSILE C1 CORNELL UNIV,DEPT MAT SCI & ENGN,ITHACA,NY 14853. RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 11 TC 6 Z9 6 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD NOV PY 1993 VL 24 IS 11 BP 2593 EP 2596 DI 10.1007/BF02646540 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA MF556 UT WOS:A1993MF55600025 ER PT J AU LAUF, RJ BIBLE, DW JOHNSON, AC EVERLEIGH, CA AF LAUF, RJ BIBLE, DW JOHNSON, AC EVERLEIGH, CA TI 2 TO 18 GHZ BROAD-BAND MICROWAVE-HEATING SYSTEMS SO MICROWAVE JOURNAL LA English DT Article AB A wideband microwave heating system has been developed using a high power traveling-wave tube (TWT) amplifier and a highly overmoded applicator cavity. The useful bandwidth is an octave or more with a single TWT and can be expanded by adding another TWT to cover a second band. The controlled, broadband processing techniques possible with this system result in uniformity of power distribution over areas not possible with more conventional fixed-frequency microwave heating approaches. This paper reports on a simple theoretical model of the variable frequency microwave concept and summarized the experimental results obtained to date. Applications include heat treating and sintering, polymer curing and plasma processing. C1 MICROWAVE LABS INC,RALEIGH,NC. RP LAUF, RJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 10 TC 18 Z9 18 U1 0 U2 0 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD NOV PY 1993 VL 36 IS 11 BP 24 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA MJ343 UT WOS:A1993MJ34300001 ER PT J AU CHOI, IK WEN, WW SMITH, RW AF CHOI, IK WEN, WW SMITH, RW TI THE EFFECT OF A LONG-CHAIN PHOSPHATE ON THE ADSORPTION OF COLLECTORS ON KAOLINITE SO MINERALS ENGINEERING LA English DT Note DE KAOLINITE; ADSORPTION; HEXAMETAPHOSPHATE; FLOTATION COLLECTORS AB The adsorption of an anionic surfactant, sodium dodecylsulfate, and a cationic surfactant, dodecyltrimethylammonium chloride, onto kaolinite was studied in the absence and presence of sodium hexametaphosphate at three different initial pH values. In general it was found that the presence of the long chain phosphate decreased adsorption of the anionic surfactant but increased the adsorption of the cationic surfactant. The importance of these items in a flotation system containing clays, such as kaolinite, is discussed. C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. UNIV NEVADA,MACKAY SCH MINES,DEPT CHEM & MET ENGN,RENO,NV 89557. RP CHOI, IK (reprint author), CHEM ABSTRACTS SERV INC,COLUMBUS,OH 43210, USA. NR 10 TC 18 Z9 21 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0892-6875 J9 MINER ENG JI Miner. Eng. PD NOV PY 1993 VL 6 IS 11 BP 1191 EP 1197 DI 10.1016/0892-6875(93)90096-6 PG 7 WC Engineering, Chemical; Mineralogy; Mining & Mineral Processing SC Engineering; Mineralogy; Mining & Mineral Processing GA LY608 UT WOS:A1993LY60800008 ER PT J AU GRIGGS, RC TAWIL, R STORVICK, D MENDELL, JR ALTHERR, MR AF GRIGGS, RC TAWIL, R STORVICK, D MENDELL, JR ALTHERR, MR TI GENETICS OF FACIOSCAPULOHUMERAL MUSCULAR-DYSTROPHY - NEW MUTATIONS IN SPORADIC CASES SO NEUROLOGY LA English DT Article ID LINKAGE MAP; FSHD; CHROMOSOME-4; LOCALIZATION; 4Q35; MARKERS AB A gene for facioscapulohumeral muscular dystrophy (FSHD) has been linked to chromosome 4q35 in families with the disease. We have used recently characterized p13E-11/D4S809 probes that map near or within the FSHD gene to investigate eight sporadic cases of FSHD whose parents showed no signs of disease. Probe p13E-11/D4S809 detected novel DNA fragments in seven of the eight sporadic FSHD individuals and not in the parents, substantiating the clinical diagnosis. Two sisters with FSHD whose parents were clinically normal had a novel DNA fragment suggestive of germline mosaicism. Probe p13E-11/D4S809 is potentially helpful in genetic counseling. However, because this probe may also detect a locus unlinked to chromosome 4, because of possible genetic heterogeneity in FSHD, and because of the presence of recombinants in autosomal dominantly inherited families, closer markers or gene definition will be needed for accurate genetic counseling in other situations. C1 LANL,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM. OHIO STATE UNIV,DEPT NEUROL,COLUMBUS,OH 43210. RP GRIGGS, RC (reprint author), UNIV ROCHESTER,SCH MED & DENT,DEPT NEUROL,BOX 673,ROCHESTER,NY 14642, USA. FU NCRR NIH HHS [MO1-RR00034, MO1-RR0004]; NINDS NIH HHS [NS22099] NR 32 TC 33 Z9 33 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0028-3878 J9 NEUROLOGY JI Neurology PD NOV PY 1993 VL 43 IS 11 BP 2369 EP 2372 PG 4 WC Clinical Neurology SC Neurosciences & Neurology GA MH652 UT WOS:A1993MH65200041 PM 8232958 ER PT J AU PIETTE, B RASHID, MSS ZAKRZEWSKI, WJ AF PIETTE, B RASHID, MSS ZAKRZEWSKI, WJ TI SOLITON SCATTERING IN THE CP2 MODEL SO NONLINEARITY LA English DT Article ID O(3) SIGMA-MODEL; 2+1 DIMENSIONS AB We consider solitonic properties of the static solutions of the CP2 model in (2 + 1) dimensions. We find that, as in the CP1 model, in their head-on scatterings the solitons scatter at 90 degrees and undergo a shift along their trajectories. We consider also the effects of adding a further term to the action (an analogue of the CP1 Hopf term, which in the CP2 case is not locally a total divergence and contributes to the equations of motion). C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP PIETTE, B (reprint author), UNIV DURHAM,DEPT MATH SCI,DURHAM DH1 3LE,ENGLAND. NR 10 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0951-7715 J9 NONLINEARITY JI Nonlinearity PD NOV PY 1993 VL 6 IS 6 BP 1077 EP 1090 DI 10.1088/0951-7715/6/6/015 PG 14 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA MM782 UT WOS:A1993MM78200015 ER PT J AU YADIGAROGLU, G NELSON, RA TESCHENDORFF, V MURAO, Y KELLY, J BESTION, D AF YADIGAROGLU, G NELSON, RA TESCHENDORFF, V MURAO, Y KELLY, J BESTION, D TI MODELING OF REFLOODING SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 4th OECD-CSNI Specialist Meeting on Transient Two-Phase Flow and System Thermal-Hydraulics CY APR 06-08, 1992 CL AIX EN PROVENCE, FRANCE SP ORG ECON COOPERAT & DEV, COMM SAFETY NUCL INSTALLAT ID FLOW REGIME TRANSITION; INVERTED ANNULAR-FLOW; POST-DRYOUT REGION; HOT ROD BUNDLES; HEAT-TRANSFER; PWR-LOCA; PHENOMENOLOGICAL MODEL; THERMAL-HYDRAULICS; CATHARE CODE; PHASE AB The state of the art in modeling reflooding situations, mainly with the two-fluid system analysis codes, is reviewed; certain related general code development issues are included. Our current modeling of reflooding is reasonable and can be made sufficiently conservative for safety assessments, but it is not outstanding. Fundamental understanding of the detailed two-phase flow and heat transfer mechanisms has not progressed significantly over the state already available several years ago. The better understanding of system behavior achieved by the coordinated program of large-scale experiments is summarized and its impact on the modeling work discussed. In the future, factors such as the additional accident scenaria now considered, the new and advanced reactor types being analyzed, and the geometric growth of computing capacity are likely to drive our efforts. The new requirements and challenges can be met best by building into the codes pieces of understanding of the actual physical processes at the most fundamental level practicable. The discussion focuses on the existing codes and their successes and shortcomings; both certain specialized and the more complex general-purpose system codes are considered. The aim is not to conduct an exhaustive review of all aspects of the problem, but rather to reach consensus on certain issues. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. GESELL ANLAGEN & REAKTORSICHERHEIT GRS MBH,FORSCHUNGSGELANDE,W-8046 GARCHING,GERMANY. CEN,CEA,DRN,DTP,F-38041 GRENOBLE,FRANCE. JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. RP YADIGAROGLU, G (reprint author), SWISS FED INST TECHNOL,CH-8092 ZURICH,SWITZERLAND. NR 138 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1993 VL 145 IS 1-2 BP 1 EP 35 DI 10.1016/0029-5493(93)90056-F PG 35 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ML994 UT WOS:A1993ML99400003 ER PT J AU MARCHLEUBA, J REY, JM AF MARCHLEUBA, J REY, JM TI COUPLED THERMOHYDRAULIC NEUTRONIC INSTABILITIES IN BOILING WATER NUCLEAR-REACTORS - A REVIEW OF THE STATE-OF-THE-ART SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 4th OECD-CSNI Specialist Meeting on Transient Two-Phase Flow and System Thermal-Hydraulics CY APR 06-08, 1992 CL AIX EN PROVENCE, FRANCE SP ORG ECON COOPERAT & DEV, COMM SAFETY NUCL INSTALLAT ID BWR; OSCILLATION; STABILITY AB This paper provides a review of the current state of the art on the topic of coupled neutronic-thermohydraulic instabilities in boiling water nuclear reactors (BWRs). The topic of BWR instabilities is of great current relevance since it affects the operation of a large number of commercial nuclear reactors. The recent trends towards introduction of high efficiency fuels that permit reactor operation in an extended operation domain with increased void and thereby increased void reactivity feedback and which often have thinner fuel rods and thereby decreased response times, has resulted in a decrease of the stability margin in the low-flow, high-power region of the operating map. This trend has resulted in a number of ''unexpected'' instability events. For instance, United States plants have experienced two instability events recently, one of them resulted in an automatic reactor scram; in Spain, two BWR plants have experienced unstable limit cycle oscillations that required operator action to suppress. Similar events have been experienced in other European countries. In recent years, the subject of BWR instabilities has been one of the more exciting topics of work in the area of transient thermohydraulics. As a result, significant advances in understanding the physics behind these events have occurred, and a ''new and improved'' state of the art has emerged recently. C1 CONSEJO SEGURIDAD NUCL,E-28040 MADRID,SPAIN. RP MARCHLEUBA, J (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37832, USA. NR 60 TC 78 Z9 80 U1 1 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1993 VL 145 IS 1-2 BP 97 EP 111 DI 10.1016/0029-5493(93)90061-D PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ML994 UT WOS:A1993ML99400008 ER PT J AU DAURIA, F MODRO, M ORIOLO, F TASAKA, K AF DAURIA, F MODRO, M ORIOLO, F TASAKA, K TI RELEVANT THERMALHYDRAULIC ASPECTS OF NEW-GENERATION LWRS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 4th OECD-CSNI Specialist Meeting on Transient Two-Phase Flow and System Thermal-Hydraulics CY APR 06-08, 1992 CL AIX EN PROVENCE, FRANCE SP ORG ECON COOPERAT & DEV, COMM SAFETY NUCL INSTALLAT AB The present paper deals with the evaluation of thermalhydraulic aspects retained of importance for the assessment of safety of the new generation nuclear plants. Following a survey of the reactor concepts proposed for the future, the attention will be focused toward SBWR, AP-600 and PIUS whose characteristics, under many respects, bound the features introduced in the largest part of the new reactors. Expected relevant phenomena typical of the mentioned plants-will be discussed in the paper: on this basis a critical overview of the experimental activities planned or in progress is presented and a judgement about the suitability of available computer codes is formulated. Conclusions are drawn in relation to the assessment of the new design proposals from a thermalhydraulic point of view. C1 INEL,IDAHO FALLS,ID 83415. NAGOYA UNIV,DEPT NUCL ENGN,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. RP DAURIA, F (reprint author), UNIV PISA,DEPT MECH & NUCL CONSTRUCT,VIA DIOTISALVI 2,I-56100 PISA,ITALY. NR 31 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1993 VL 145 IS 1-2 BP 241 EP 259 DI 10.1016/0029-5493(93)90070-P PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ML994 UT WOS:A1993ML99400017 ER PT J AU LEBLANC, B KAYE, SM ASAKURA, N BELL, RE DUPERREX, PA GAMMEL, GM FISHMAN, H HATCHER, RE HOLLAND, A KAITA, R KESSEL, CE KUGEL, HW LEVINTON, FM OKABAYASHI, M PAUL, SF SAUTHOFF, NR SESNIC, S TAKAHASHI, H AF LEBLANC, B KAYE, SM ASAKURA, N BELL, RE DUPERREX, PA GAMMEL, GM FISHMAN, H HATCHER, RE HOLLAND, A KAITA, R KESSEL, CE KUGEL, HW LEVINTON, FM OKABAYASHI, M PAUL, SF SAUTHOFF, NR SESNIC, S TAKAHASHI, H TI HEAT-TRANSPORT IN PBX-M HIGH BETA(P) PLASMAS SO NUCLEAR FUSION LA English DT Article ID DIVERTOR DISCHARGES; ENERGY CONFINEMENT; TOKAMAKS; PDX AB High poloidal beta discharges in PBX-M routinely enter the H mode regime: typically, a quiescent phase followed by an MHD-active phase characterize the H mode period. An analysis of the energy transport during these phases is conducted using the experimental data and the code TRANSP; effective thermal diffusivities are computed. The quiescent H phase is characterized by a decrease of the thermal ion energy transport and a flattening of the associated effective diffusivity profile. Enhanced fast ion losses are observed during the MHD-active phase; particles in the lower end of the fast-ion energy spectrum with a large perpendicular velocity component are predominantly affected. Folding these losses into the analysis permits to reproduce the measured stored energy and time evolution of the neutron production rate during the MHD-active phase. During the MHD-active phase, the ion thermal diffusivity maintained a profile (magnitude and shape) similar to that obtained at the end of the quiescent H phase, suggesting, within the uncertainty of this analysis, that the MHD activity does not affect the thermal plasma energy transport. The observed stored energy (beta) saturation results from the enhanced losses in the fast-ion population. An analysis without inclusion of enhanced fast ion losses fails to reproduce the experimental measurements. Throughout the H mode period the electron effective diffusivity remains lower than the ion effective diffusivity. An error analysis is presented. C1 JAERI,TOKAI,IBARAKI,JAPAN. LAB ARMEMENT,BERN,SWITZERLAND. GRUMMAN AEROSP CORP,BETHPAGE,NY. ARACOR,SUNNYVALE,CA. FUS PHYS & TECHNOL,TORRANCE,CA. RP LEBLANC, B (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 16 TC 3 Z9 3 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD NOV PY 1993 VL 33 IS 11 BP 1645 EP 1656 DI 10.1088/0029-5515/33/11/I06 PG 12 WC Physics, Fluids & Plasmas SC Physics GA MV487 UT WOS:A1993MV48700006 ER PT J AU HANNA, SM STEFAN, PM AF HANNA, SM STEFAN, PM TI APPLICATION OF IMPEDANCE MEASUREMENT TECHNIQUES TO ACCELERATING CAVITY MODE CHARACTERIZATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LINE AB Impedance measurements, using a central wire to simulate the electron beam, were performed on a 52 MHz accelerating cavity at the National Synchrotron Light Source (NSLS). This cavity was recently installed in the X-ray storage ring at the NSLS as a part of an upgrade of the ring. To damp higher-order modes (HOM) in this cavity, damping antennas have been installed. We implemented the impedance measurement technique to characterize the cavity modes up to 1 GHz and confirm the effectiveness of the damping antennas. Scattering parameters were measured using a network analyzer (HP 8510B) with a personal computer as a controller. Analysis based on S and T parameters for the system was used to solve for the cavity impedance, Z(omega), as a function of the measured transmission response, S-21(omega). Search techniques were used to find the shunt resistance R(sh), and Q from the calculated Z(omega) for different modes. Our results for R/Q showed good agreement with URMEL simulations. The values of Q were compared with other independent e measurement techniques. Our analytical technique offers an alternative approach for cases where full thru-reflection-line (TRL) calibration is not feasible and a more time-effective technique for obtaining R/Q, compared with the bead-pull method. RP BROOKHAVEN NATL LAB, NATL SYNCHROTRON LIGHT SOURCE, UPTON, NY 11973 USA. NR 9 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 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 1 PY 1993 VL 335 IS 3 BP 367 EP 376 DI 10.1016/0168-9002(93)91220-H PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MF889 UT WOS:A1993MF88900002 ER PT J AU HANNA, SM KEANE, J AF HANNA, SM KEANE, J TI ANALYSIS OF QUADRATURE HYBRIDS FOR ACCELERATOR APPLICATIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The operation of a quadrature hybrid as a power combiner is analyzed using four-port scattering parameters model. The analytical results are compared with data measured experimentally using a 211 MHz cavity. Graphical solutions of the measured cases for different cavity phases are in good agreement with analytical predictions. The use of the 90 degrees-hybrid as an RF circulator is also analyzed. The active operation of the harmonic cavity in the NSLS VUV-ring is used as an example for this application. This fourth-harmonic cavity is used to change the shape of the bucket potential to lengthen a stored bunch. Thus, a longer stored-beam lifetime can be achieved without compromising the high brightness of the VUV photon beam. If operated actively, the harmonic cavity would present a mismatched load to an RF generator. A circulator would allow for better operation of the RF generator. It would also minimize the generator-accelerating cavity-beam-harmonic cavity-generator coupling. In this paper, we use the harmonic cavity case as an example for the use of the 90 degrees-hybrid as a circulator. The advantages and disadvantages of the use of the 90 degrees-hybrid as a circulator are discussed. RP HANNA, SM (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 1 PY 1993 VL 335 IS 3 BP 377 EP 384 DI 10.1016/0168-9002(93)91221-8 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MF889 UT WOS:A1993MF88900003 ER PT J AU JOSHI, PK MANTICA, PF ROBINSON, SJ GILL, RL ZGANJAR, EF AF JOSHI, PK MANTICA, PF ROBINSON, SJ GILL, RL ZGANJAR, EF TI PICOSECOND LIFETIME MEASUREMENT SYSTEMS FOR LEVELS POPULATED BY ELECTRON-CAPTURE AND FOR LEVELS DECAYING BY E0 TRANSITIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID NEUTRON-RICH NUCLEI AB Two new systems, to measure lifetimes of nuclear levels in the picosecond range that decay by E0 transitions, have been developed at the UNISOR on-line isotope separator facility. These systems make use, for the first time, of fast coincidences involving characteristic X-rays. The first of the two systems involves specifically the X-rays originating from the internal conversion process, while the second involves X-rays resulting from both the internal conversion and electron capture processes. C1 ORISE,UNISOR,OAK RIDGE,TN 37831. TENNESSEE TECHNOL UNIV,DEPT PHYS,COOKEVILLE,TN 38505. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP JOSHI, PK (reprint author), LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 1 PY 1993 VL 335 IS 3 BP 461 EP 469 DI 10.1016/0168-9002(93)91231-B PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MF889 UT WOS:A1993MF88900013 ER PT J AU ROGERS, CS MACRANDER, AT AF ROGERS, CS MACRANDER, AT TI THERMAL-STRESS ANALYSIS AND DIFFRACTION SIMULATION OF A STANDARD AND INCLINED GALLIUM-COOLED HIGH-HEAT-LOAD X-RAY MONOCHROMATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CRYSTAL MONOCHROMATOR; PERFORMANCE; UNDULATOR; POWER; RADIATION; CHESS AB This paper describes the methods used to calculate the thermally induced deformations in symmetrically cut, standardly configured and inclined monochromator crystals using finite element analysis. The results of these analyses are compared to recent undulator experiments conducted at the Cornell High Energy Synchrotron Source (CHESS) using a high-performance, liquid-gallium-cooled silicon crystal. The modeling was carried out for a range of machine currents, and the calculated locking curve widths were within 10% of the experimental values. The asymmetric shape of the rocking curves at high currents was also predicted. These results lend credibility to our assertion that computer simulations can be used to reliably and accurately predict the performance of high-heat-load X-ray optics for future synchrotron sources. RP ROGERS, CS (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 23 TC 8 Z9 8 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 1 PY 1993 VL 335 IS 3 BP 561 EP 568 DI 10.1016/0168-9002(93)91244-H PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MF889 UT WOS:A1993MF88900026 ER PT J AU MUSKET, RG DALEY, RS PATTERSON, RG AF MUSKET, RG DALEY, RS PATTERSON, RG TI SPINNING-WIRE DOSIMETRY FOR ION-BEAM ANALYSIS OF MATERIALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID STOPPING POWERS; BACKSCATTERING AB A novel spinning-wire dosimetry system has been developed for the MeV ion beams normally used in ion-beam analyses of materials. The system consists of a spinning wire that crosses the beam axis before the specimen, a surface barrier detector with externally selectable collimating apertures, and a retractable Faraday cup located behind the retractable specimen holder. The surface barrier detector provides energy spectroscopy of the ions backscattered from the spinning wire as it passes through the ion-beam axis. A high-energy segment of the backscattered spectrum is counted in a single-channel analyzer and calibrated against a simultaneous measurement of the integrated beam current using the Faraday cup. For MeV He+ ions with currents of 2-200 nA, the present system has been shown to provide counts that are proportional to the integrated currents with a precision of 1%. RP MUSKET, RG (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 7 TC 13 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD NOV PY 1993 VL 83 IS 3 BP 425 EP 429 DI 10.1016/0168-583X(93)95866-4 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MJ110 UT WOS:A1993MJ11000020 ER PT J AU WILBUR, DS VESSELLA, RL STRAY, JE GOFFE, DK BLOUKE, KA ATCHER, RW AF WILBUR, DS VESSELLA, RL STRAY, JE GOFFE, DK BLOUKE, KA ATCHER, RW TI PREPARATION AND EVALUATION OF PARA-[AT-211]ASTATOBENZOYL LABELED ANTIRENAL CELL-CARCINOMA ANTIBODY A6H F(AB')2 - IN-VIVO DISTRIBUTION COMPARISON WITH PARA-[I-125]IODOBENZOYL LABELED A6H F(AB')2 SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article ID MONOCLONAL-ANTIBODIES; FAB FRAGMENT; ASTATINE-211; CANCER; ASTATINATION; PROTEINS; RADIONUCLIDES; CONJUGATE; THERAPY; DECAY AB A preliminary investigation of an At-211 labeled anti-renal cell carcinoma antibody fragment, A6H F(ab')2, was conducted. In the investigation, A6H F(ab')2 was labeled by conjugation with N-succinimidyl p-[At-211]astatobenzoate, and the in vivo biodistribution was evaluated in athymic mice bearing TK-82 renal cell carcinoma xenografts. As a control, p-[I-125]iodobenzoyl labeled A6H F(ab')2 was coinjected with the astatinated F(ab')2. The data obtained demonstrated that the two radiolabels (At-211 and I-125) had quite similar distributions, providing evidence that the At-211 remained attached to the A6H F(ab')2 in vivo. Further, the astatinated antibody attained a 2:1 tumor-to-blood ratio, and greater than 35:1 tumor-to-muscle ratio, at 4 h post-injection, suggesting that this antibody conjugate could be used to evaluate treatment of metastatic renal cell carcinoma in a mouse model. C1 UNIV WASHINGTON,DEPT RADIAT ONCOL,SEATTLE,WA 98195. UNIV WASHINGTON,DEPT UROL,SEATTLE,WA 98195. ARGONNE NATL LAB,ARGONNE,IL 60439. NR 44 TC 55 Z9 58 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2897 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD NOV PY 1993 VL 20 IS 8 BP 917 EP 927 DI 10.1016/0969-8051(93)90092-9 PG 11 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MH355 UT WOS:A1993MH35500005 PM 8298571 ER PT J AU PALMIOTTI, G CARRICO, CB LEWIS, EE AF PALMIOTTI, G CARRICO, CB LEWIS, EE TI VARIATIONAL NODAL TRANSPORT METHODS WITH ANISOTROPIC SCATTERING SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID NEUTRON-TRANSPORT; FINITE-ELEMENT AB The variational nodal method is generalized to treat within-group and group-to-group anisotropic scattering in two- and three-dimensional eigenvalue and fixed source problems. The resulting formalism is implemented as the VARIational Anisotropic Nodal Transport code (VARIANT) within the shell of the Argonne National Laboratory production code DIF3D. The code is applied to a series of Cartesian and hexagonal geometry model problems and the accuracy of the results compared fo those from TWODANT and TWOHEX and to the Monte Carlo code VIM, respectively, in two and three dimensions. VARIANT is then applied to multigroup hexagonal representations of the Experimental Breeder Reactor II, and results are obtained for three-dimensional eigenvalue and for two-dimensional neutron-gamma heating problems. C1 CEN CADARACHE,CEA,F-13108 ST PAUL DURANCE,FRANCE. ARGONNE NATL LAB,DIV REACTOR ANAL,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MECH ENGN,EVANSTON,IL 60208. RI Lewis, Elmer/B-7597-2009 NR 22 TC 9 Z9 9 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD NOV PY 1993 VL 115 IS 3 BP 233 EP 243 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ME900 UT WOS:A1993ME90000005 ER PT J AU ADAMS, BT MOREL, JE AF ADAMS, BT MOREL, JE TI A 2-GRID ACCELERATION SCHEME FOR THE MULTIGROUP S-N EQUATIONS WITH NEUTRON UPSCATTERING SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID SYNTHETIC ACCELERATION AB A two-grid acceleration scheme for the multigroup S-n equations with neutron upscattering is developed. Although it has been tested only in one-dimensional slab geometry with linear discontinuous spatial differencing, previous experience suggests that it should be applicable in any geometry with any spatial differencing scheme for which an unconditionally efficient diffusion-synthetic acceleration scheme exists. The method is derived, theoretically analyzed, and computationally tested. The results indicate that the scheme is unconditionally effective in terms of error reduction per iteration and highly efficient in terms of computational cost. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 7 TC 22 Z9 22 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD NOV PY 1993 VL 115 IS 3 BP 253 EP 264 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ME900 UT WOS:A1993ME90000007 ER PT J AU AZMY, YY AF AZMY, YY TI CELL-CENTERED IMPOSED DIFFUSION SYNTHETIC ACCELERATION FOR WEIGHTED DIFFERENCE TRANSPORT METHODS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note ID DISCRETE-ORDINATES EQUATIONS AB We compute the spectral radius for Reed's cell-centered imposed diffusion synthetic acceleration (IDSA) method applied to a fixed-weights weighted diamond-difference (WDD) scheme. We show that Reed's conclusion that IDSA is conditionally stable is strictly true only for very small magnitude spatial weights. For the zeroth-order nodal integral method, the step method (unit weights), and WDD methods with large enough weights (say larger than 0.5), a simple choice of the diffusion coefficient results in unconditionally stable, rapidly converging iterations. Moreover, the IDSA's spectral radius vanishes in the limit of infinitely thick computational cells, thereby implying immediate convergence for sufficiently thick problems. We verify all these results via model and nonmodel test problems. RP OAK RIDGE NATL LAB, DIV ENGN PHYS & MATH, POB 2008, OAK RIDGE, TN 37831 USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 0029-5639 EI 1943-748X J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD NOV PY 1993 VL 115 IS 3 BP 265 EP 272 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ME900 UT WOS:A1993ME90000008 ER PT J AU MCCONNELL, P SALZBRENNER, R WELLMAN, GW SORENSON, KB AF MCCONNELL, P SALZBRENNER, R WELLMAN, GW SORENSON, KB TI AN EVALUATION OF THE USE OF DEPLETED URANIUM AS A STRUCTURAL COMPONENT FOR TRANSPORT CASKS SO NUCLEAR TECHNOLOGY LA English DT Article DE DEPLETED URANIUM; RADIOACTIVE MATERIAL TRANSPORTATION; CONTAINMENT AB Depleted uranium (DU) alloys are currently used for gamma-ray shielding in casks and as shielding blocks. For the transport cask application, a significant weight and dimensional penalty exists when using the DU solely for shielding. If credit could be taken for the structural use of the DU for containment in a transport cask, greater payloads may be realized. Mechanical property measurements of several uranium alloys and finite element analyses of prototype transport casks assumed to be constructed, in part, from selected uranium materials were performed to evaluate the potential for the use of DU alloys for cask containment. These data and analyses support the concept of the use of DU alloys for the containment function even under hypothetical accident conditions. A conclusion is that the properties of certain DU alloys are therefore sufficient to warrant further consideration of the material for this purpose. C1 SANDIA NATL LABS,DEPT MECH & CORROS MET,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DEPT TRANSPORT SYST,ALBUQUERQUE,NM 87185. RP MCCONNELL, P (reprint author), SANDIA NATL LABS,DEPT TRANSPORT DEV,ALBUQUERQUE,NM 87185, USA. NR 10 TC 1 Z9 1 U1 2 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 NOV PY 1993 VL 104 IS 2 BP 171 EP 181 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MC088 UT WOS:A1993MC08800003 ER PT J AU CHESNUT, DA AF CHESNUT, DA TI DEMANDS PLACED ON WASTE PACKAGE PERFORMANCE TESTING AND MODELING BY SOME GENERAL RESULTS OF RELIABILITY-ANALYSIS SO NUCLEAR TECHNOLOGY LA English DT Article DE FAILURE PROBABILITIES; NUCLEAR WASTE; ENGINEERED BARRIERS AB Waste packages for a U.S. nuclear waste repository are required to provide reasonable assurance of maintaining substantially complete containment of radionuclides for 300 to 1000 yr after closure and of permitting only controlled release of radionuclides for 10 000 yr. The waiting time to failure for complex failure processes affecting engineered or manufactured systems is often found to be an exponentially distributed random variable. Assuming that this simple distribution can be used to describe the failures of hypothetical single-barrier waste packages, bounding calculations show that the mean time to failure would have to be > 10(7) yr in order to provide reasonable assurance of meeting this requirement. If such a waste package could be manufactured, it would be practically impossible to demonstrate its performance within the repository preclosure time of 40 yr. With two independent barriers, each would need to have a mean time to failure of only 10(5) yr to provide the same reliability, illustrating that the use of redundant independent barriers is the key to both achieving and demonstrating regulatory compliance. However, even this demonstration would require testing tens of thousands of two-barrier systems for several decades. As more barriers are added, the mean lifetime required of each individual barrier decreases, and the demonstration of performance becomes more feasible, although still requiring extensive testing and observation during the preclosure period for performance confirmation. In any case, the results illustrate that neither the engineered barrier system nor the geologic barrier system alone is likely to provide the required degree of assurance of repository safety. RP CHESNUT, DA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,POB 808,L-202,LIVERMORE,CA 94550, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 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 NOV PY 1993 VL 104 IS 2 BP 182 EP 192 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MC088 UT WOS:A1993MC08800004 ER PT J AU FENG, XD BATES, JK BUCK, EC BRADLEY, CR GONG, ML AF FENG, XD BATES, JK BUCK, EC BRADLEY, CR GONG, ML TI LONG-TERM COMPARISON OF DISSOLUTION BEHAVIOR BETWEEN FULLY RADIOACTIVE AND SIMULATED NUCLEAR WASTE GLASSES SO NUCLEAR TECHNOLOGY LA English DT Article DE FULLY RADIOACTIVE NUCLEAR WASTE GLASS; GLASS DISSOLUTION MECHANISM; SURFACE ALTERATION FORMATION AB The behavior of radioactive sludge-based and simulated nuclear waste glasses has been compared by long-term testing of radioactive and simulated compositions of Savannah River Laboratory 165, 131, and 200 glasses. Static tests at glass surface area-to-solution volume (SA / V) ratios of 340 and 2000 m-1 up to 720 days show little difference in reactivity between radioactive and simulated waste glasses. The same leach trends are observed for both glass types. The differences in reactivity at an SA / V of 2000 m-1 or below are not large enough to alter the order of glass durability for the different compositions nor to change the controlling glass dissolution processes. The small differences in reactivity between fully radioactive and simulated glasses can reasonably be explained if the controlling reaction process and leachate pH values are accounted for. However, at an SA / V of 20 000 m-1, the simulated nuclear waste glass, 200S, leaches faster than the corresponding radioactive glass by a factor of 40 within 1 yr. The accelerated reaction with the simulated glass 200S is associated with the formation of crystalline phases such as clinoptilolite (or K-feldspar), and a pH excursion. The radiation field generated by the fully radioactive glass reduces the solution pH, which, in turn, may retard the onset of the increased reaction rate. This result suggests that the fully radioactive nuclear waste glass 200R may be substantially more durable than the simulated 200S glass if the lower pH in the 200R leachate can be sustained. Meaningful comparison tests between radioactive and simulated nuclear waste glasses should include long-term and high SA / V tests. RP FENG, XD (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Buck, Edgar/D-4288-2009; Buck, Edgar/N-7820-2013 OI Buck, Edgar/0000-0001-5101-9084 NR 22 TC 12 Z9 14 U1 0 U2 3 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 NOV PY 1993 VL 104 IS 2 BP 193 EP 206 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MC088 UT WOS:A1993MC08800005 ER PT J AU BANGERTER, RO AF BANGERTER, RO TI THE INDUCTION APPROACH TO HEAVY-ION INERTIAL FUSION - ACCELERATOR AND TARGET CONSIDERATIONS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB Induction acceleration is one of two principal approaches for producing ion beams for heavy-ion inertial fusion. This approach was first suggested by the late Denis Keefe of Lawrence Berkeley Laboratory and is the main approach of the U.S. heavy-ion fusion program. Induction accelerators have the ability to handle high beam currents; therefore, accumulation rings or storage rings are not required. This paper reviews the target and accelerator considerations that are important for the design of induction accelerators for fusion. These considerations, including some important assumptions, have led to a standard induction accelerator concept; however, a careful examination of the assumptions and considerations shows that many of them are not truly fundamental. Through improvements in technology, changes in design, and alternate ways of focusing beams, it appears possible to circumvent or relax the constraints imposed by the standard orthodoxy. If it is possible, it will lead to induction accelerators that are more efficient and less costly than the standard concept. RP BANGERTER, RO (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, MS 47-112, BERKELEY, CA 94720 USA. NR 10 TC 27 Z9 27 U1 0 U2 2 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 NOV PY 1993 VL 106 IS 11 BP 1445 EP 1456 DI 10.1007/BF02821239 PG 12 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000002 ER PT J AU LINDL, JD AF LINDL, JD TI ICF - RECENT ACHIEVEMENTS AND PERSPECTIVES SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID LASER FUSION; GROWTH; INSTABILITIES; PLASMA AB The U.S. Office of Fusion Energy is relying on the Department of Energy's Defense Programs (DP) ICF Program to provide the target physics data base for an Inertial Fusion Energy (IFE) program. In the indirect-drive approach, the primary approach for heavy-ion beam driven fusion (HI) and for the glass-laser-based National Ignition Facility (NIF), the capsule is radiation driven, so that the implosion and burn physics requirements apply to both types of drivers. If the ion-driven hohlraums are heated to the same radiation temperature (T-r), then the requirements for hydrodynamic instability, implosion uniformity, and pulse shaping can be directly applied. In addition, at the same radiation temperature, X-ray hohlraum wall losses, radiation-driven hohlraum wall motion, and radiation transport are also directly applicable. These are the primary issues which affect coupling efficiency and hohlraum symmetry, so that the DP hohlraum physics program provides a solid base for calculating HI hohlraums. Progress on these issues on the Nova laser will be described. RP LINDL, JD (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, L-472, LIVERMORE, CA 94550 USA. NR 20 TC 21 Z9 21 U1 1 U2 2 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 NOV PY 1993 VL 106 IS 11 BP 1467 EP 1487 DI 10.1007/BF02821241 PG 21 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000004 ER PT J AU EYLON, S HENESTROZA, E CHUPP, WW YU, S AF EYLON, S HENESTROZA, E CHUPP, WW YU, S TI LOW-EMITTANCE 0.8AK(+) ION-SOURCE FOR THE LBL INDUCTION LINAC SYSTEM EXPERIMENT (ILSE) SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB A high-current injector for heavy-ion fusion presently under construction at Lawrence Berkeley Laboratory requires large sources of up to 17 cm in diameter and total potassium ion current of 790 mA with a low normalized transverse emittance of less than 0.5 mm mrad. A 1'' diameter hot alumino silicate (zeolite) source was fabricated and tested in the injector set-up of SBTE, an e;existing facility at LBL. Initial measurements showed a maximum space-charge-limited ion current of 95mk The corresponding density of 19mA/cm(2) was limited by the source diode optics and not by the source emission. The density required for the high-current injector is 4 mA/cm(2). The normalized emittance was measured to be 0.06 mm mrad, corresponding to a transverse temperature of 0.2 eV. Nondestructive life tests showed that the source can be operated under continuous operating conditions of the high-current injector for more than a month (twenty eight-hour days, with 1 mu s long pulses at 1 Hz). d.c. destructive life tests showed that similar to 30% of the total stored K can be ionized and extracted, allowing, in principle, for years of operation for the high-current injector. Furthermore, we shall describe the extension of the fabricating technique to large-diameter sources (up to 17 cm) and report on measured ion emission performance, measured surface temperature uniformity and heating power considerations. RP EYLON, S (reprint author), UNIV CALIFORNIA, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, MS 47-112, BERKELEY, CA 94720 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1509 EP 1515 DI 10.1007/BF02821244 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000007 ER PT J AU EYLON, S HENESTROZA, E RUTKOWSKI, H YU, S GROTE, D CHEN, YJ HEWETT, D AF EYLON, S HENESTROZA, E RUTKOWSKI, H YU, S GROTE, D CHEN, YJ HEWETT, D TI HEAVY-ION FUSION INJECTOR EXPERIMENTS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB We report on three experiments,performed in, connection with the 2 MV electrostatic quadrupole (ESQ) injector under construction at Lawrence Berkeley Laboratory. Scaled experiments have been conducted to study possible beam emittance growth due to beam aberrations in an ESQ injector. The experiment uses the SBTE (Single Beam Transport Experiment) accelerator system, quarter-scale ESQ set-up and a potassium ion diode source. Measured emittance growth changes significantly with variations in current and diode energy, in good agreement with theoretical predictions. In addition, beam transport experiments were performed in a 1 MV axisymmetric electrostatic aperture column using a zeolite 1'' diameter potassium ion source. Experimental measurements in good agreement with 2-1/2 D simulations showed that low-emittance beams can be produced in axisymmetric structures. Finally, ESQ breakdown voltage tests without beam were performed at up to two times the quadrupole working voltage. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP EYLON, S (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1517 EP 1523 DI 10.1007/BF02821245 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000008 ER PT J AU YU, S EYLON, S CHUPP, WW FALTENS, A FESSENDEN, T HENESTROZA, E HIPPLE, R JUDD, D PETERS, C REGINATO, L RUTKOWSKI, H STOKER, J VANECEK, D BARNARD, J CAPORASO, G CHEN, YJ DEADRICK, F FRIEDMAN, A GROTE, D HEWETT, D AF YU, S EYLON, S CHUPP, WW FALTENS, A FESSENDEN, T HENESTROZA, E HIPPLE, R JUDD, D PETERS, C REGINATO, L RUTKOWSKI, H STOKER, J VANECEK, D BARNARD, J CAPORASO, G CHEN, YJ DEADRICK, F FRIEDMAN, A GROTE, D HEWETT, D TI HIGH-CURRENT INJECTOR FOR HEAVY-ION FUSION SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB A 2 MV, 800 mA, K+ injector for heavy-ion fusion studies is under construction. This new injector is a one-beam version of the proposed 4-beam ILSE injector. A new 36-module MARX is being built to achieve a 5 mu s flat top. The high-voltage generator is stiff (<5 K Omega) to minimize effects of beam-induced transients. A large (approximate to 7'' diameters) curved hot alumine-silicate source emits a 1 mu s long beam pulse through a gridless extraction electrode, and the ions are accelerated to 1 MV in a diode configuration. Acceleration to 2 MV takes place in a set of electrostatic quadrupole (ESQ) units, arranged to simultaneously focus and accelerate the ion beam. Heavy shields and other protection devices have been built in to minimize risks of high-voltage breakdown. Beam aberration effects through the ESQ have been studied extensively with theory, simulations, and scaled experiments. The design, simulations, experiments, and engineering of the ESQ injector will be presented. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP YU, S (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1541 EP 1546 DI 10.1007/BF02821249 PG 6 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000012 ER PT J AU BARNARD, JJ BANGERTER, RO DEADRICK, F FALTENS, A FRIEDMAN, A FONG, CG GODLOVE, TF GROTE, DP JUDD, DL GRIFFITH, LV KIRBIE, HC LEE, EP NEIL, VK NEWTON, MA PAUL, AC REGINATO, LL SHARP, WM SHAY, HD YU, SS AF BARNARD, JJ BANGERTER, RO DEADRICK, F FALTENS, A FRIEDMAN, A FONG, CG GODLOVE, TF GROTE, DP JUDD, DL GRIFFITH, LV KIRBIE, HC LEE, EP NEIL, VK NEWTON, MA PAUL, AC REGINATO, LL SHARP, WM SHAY, HD YU, SS TI RECIRCULATING INDUCTION ACCELERATORS FOR HEAVY-ION FUSION SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB A two-year study of recirculating induction heavy-ion accelerators (recirculators) as low-cost drivers for inertial-fusion energy power plants has recently been completed. A summary of that study and other recent work on recirculators is presented. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. FM TECHNOL INC, FAIRFAX, VA 22302 USA. RP BARNARD, JJ (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 10 TC 4 Z9 4 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 NOV PY 1993 VL 106 IS 11 BP 1547 EP 1552 DI 10.1007/BF02821250 PG 6 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000013 ER PT J AU NEWTON, MA KIRBIE, HC AF NEWTON, MA KIRBIE, HC TI TECHNOLOGY DEVELOPMENT FOR RECIRCULATING HEAVY-ION ACCELERATORS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB The << recirculator >>, a recirculating heavy-ion accelerator, has been identified as a promising approach for an inertial-fusion driver. System studies have been conducted to evaluate the recirculator on the basis of feasibility and cost. The recirculator has been shown to have significant cost advantages over other potential driver schemes, but some of the performance requirements exceed the capabilities of present technology. The system studies identified the high-leverage areas where advances in technology will significantly impact the cost and performance of a recirculator. One of the high-leverage areas is the modulator system which generates the acceleration potentials in the induction cells. The modulator system must be capable of generating the acceleration potentials at peak repetition rates in excess of 100 kHz with variable pulse widths. LLNL is developing a modulator technology capable of driving induction cells using the latest in solid-state MOSFET technology. A small-scale modulator has been built and tested to prove the concept and the next version is presently being designed. Our objective is to demonstrate a modulator operating at 5 kV, 1 kA, with 0.2-1 pulse widths while driving an induction cell at > 100 kHz within the next year. This paper describes the recirculator, the technology requirements necessary to implement it and the modulator system development that is being pursued to meet these requirements. RP NEWTON, MA (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, L-440, LIVERMORE, CA 94550 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1575 EP 1581 DI 10.1007/BF02821254 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000017 ER PT J AU REGINATO, LL ABRAHAM, W BERNERS, D BROAD, J DUDAK, B FALTENS, A FONG, M GHIORSO, W GREENWAY, W HIPPLE, R HOUSTON, C KATAYANAGI, T LIONBERGER, C MEYER, H PEREZ, J PETERS, C PIKE, C PURTELL, T PRUYN, J RICE, J STOKER, J TIFFANY, W VANECEK, D DEADRICK, F NEWTON, M AF REGINATO, LL ABRAHAM, W BERNERS, D BROAD, J DUDAK, B FALTENS, A FONG, M GHIORSO, W GREENWAY, W HIPPLE, R HOUSTON, C KATAYANAGI, T LIONBERGER, C MEYER, H PEREZ, J PETERS, C PIKE, C PURTELL, T PRUYN, J RICE, J STOKER, J TIFFANY, W VANECEK, D DEADRICK, F NEWTON, M TI INDUCTION ACCELERATOR DEVELOPMENT FOR HEAVY-ION FUSION SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB For approximately a decade, the Heavy-Ion Fusion Accelerator Research (HIFAR) group at LBL has been exploring the use of induction accelerators with multiple beams as the driver for inertial-fusion targets. Scaled experiments have investigated the transport of space-charge-dominated beams (SBTE), and the current amplification and transverse emittance control in induction linacs (MBE-4) with very encouraging results. In order to study many of the beam manipulations required by a driver and to further developed economically competitive technology, a proposal has been made in partnership with LLNL to build a 10 MeV accelerator and to conduct a series of experiments collectively called the Induction Linac System Experiments (ILSE). The major components critical to the ILSE accelerator are currently under development. We have constructed a full-scale induction module and we have tested a number of amorphous magnetic materials developed by Allied Signal to establish an overall optimal design. The electric and magnetic quadrupoles critical to the transport and focusing of heavy-ion beams are also under development. The hardware is intended to be economically competitive for a driver without sacrificing any of the physics or performance requirements. This paper will concentrate on the recent developments and tests of the major components required by the ILSE accelerator. RP REGINATO, LL (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 3 TC 1 Z9 1 U1 0 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 NOV PY 1993 VL 106 IS 11 BP 1593 EP 1603 DI 10.1007/BF02821256 PG 11 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000019 ER PT J AU ANDERSON, OA AF ANDERSON, OA TI EMITTANCE GROWTH-RATES FOR DISPLACED BEAMS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID PARTICLE BEAMS; ENERGY AB We analyze emittance growth rates for beams initially displaced in focusing channels. If the focusing force is slightly nonlinear, there is a gradual transfer of the potential energy of beam displacement into kinetic energy associated with emittance growth. We present explicit results for the emittance growth distance as a function of the nonlinearity of the channel. These results will have practical importance for designers of accelerators and transport systems when setting realistic tolerances for initial beam alignment. These tolerances will depend on the nonlinearity and the length of the system. C1 PARTICLE BEAM CONSULTANTS, BERKELEY, CA 94705 USA. RP ANDERSON, OA (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELY LAB, BERKELEY, CA 94720 USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1605 EP 1611 DI 10.1007/BF02821257 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000020 ER PT J AU CELATA, CM BANGERTER, RO CHUPP, W EYLON, S FALTENS, A FAWLEY, WM FESSENDEN, TJ FONG, CG HAHN, K HENESTROZA, E JUDD, DL LEE, EP PETERS, C REGINATO, LL SEIDL, PA YU, S BARNARD, JJ CHEN, YJ FRIEDMAN, A GROTE, DP HEWETT, DW NEWTON, MA AF CELATA, CM BANGERTER, RO CHUPP, W EYLON, S FALTENS, A FAWLEY, WM FESSENDEN, TJ FONG, CG HAHN, K HENESTROZA, E JUDD, DL LEE, EP PETERS, C REGINATO, LL SEIDL, PA YU, S BARNARD, JJ CHEN, YJ FRIEDMAN, A GROTE, DP HEWETT, DW NEWTON, MA TI THE ILSE EXPERIMENTAL PROGRAM SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB The Heavy-Ion Fusion Accelerator Research Program at Lawrence Berkeley Laboratory has proposed building a 10 MeV induction linac systems experiment, ILSE, to investigate accelerator physics and beam manipulations which are needed or desirable for an induction linac driver. This paper describes the experiments proposed for ILSE: transverse beam combining, drift compression, bending of space-charge-dominated beams, final focus, recirculation, and some studies of beam propagation in the environment of the reactor chamber. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP CELATA, CM (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 5 TC 3 Z9 3 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 NOV PY 1993 VL 106 IS 11 BP 1631 EP 1636 DI 10.1007/BF02821260 PG 6 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000023 ER PT J AU FAWLEY, WM LASLETT, LJ CELATA, CM FALTENS, A HABER, I AF FAWLEY, WM LASLETT, LJ CELATA, CM FALTENS, A HABER, I TI SIMULATION STUDIES OF SPACE-CHARGE-DOMINATED BEAM TRANSPORT IN LARGE-APERTURE RATIO QUADRUPOLES SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB For many cases of interest in the design of heavy-ion fusion accelerators, the maximum transportable current in a magnetic-quadrupole lattice scales as (a/L)(2), where a is the useful dynamic aperture and L is the half-lattice period. There are many cost benefits in maximizing the usable aperture which must be balanced against unwanted effects such as possible emittance growth and particle loss from anharmonic fringe fields. We have used two independent simulation codes to model space-charge-dominated beam transport both in an azimuthally pure quadrupole FODO lattice design and in a more conventional design. Our results indicate that careful matching will be necessary to minimize emittance growth and that (a/L) ratios of 0.2 or larger are possible for particular parameters. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP FAWLEY, WM (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1637 EP 1642 DI 10.1007/BF02821261 PG 6 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000024 ER PT J AU FRIEDMAN, A CALLAHAN, DA GROTE, DP HABER, I LANGDON, AB LUND, SM AF FRIEDMAN, A CALLAHAN, DA GROTE, DP HABER, I LANGDON, AB LUND, SM TI WHAT WE HAVE LEARNED FROM 3D AND R, Z INTENSE-BEAM SIMULATIONS USING THE WARP CODE SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID FUSION AB A multi-dimensional discrete-particle simulation code, WARP, and its application to heavy-ion fusion beams is described. The code's 3D package combines features of an accelerator code and a particle-in-cell plasma simulation, and can efficiently track beams through many lattice elements and around bends. The code's r, z package allows one to follow beams over very long times and models the accelerating module impedances. A number of applications are presented. These have led to an improved understanding of: beam equilibria, and the approach to equilibrium; longitudinal beam dynamics and stability; electrostatic: quadrupole (ESQ) injector aberrations; bending and recirculation of space-charge-dominated beams; and the drift-compression process. The code is being used for accelerator design, as well as for theoretical investigations. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP FRIEDMAN, A (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, L-440, LIVERMORE, CA 94550 USA. NR 16 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 NOV PY 1993 VL 106 IS 11 BP 1649 EP 1655 DI 10.1007/BF02821263 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000026 ER PT J AU HAHN, K CELATA, C FALTENS, A JUDD, D SEIDL, P LEE, E AF HAHN, K CELATA, C FALTENS, A JUDD, D SEIDL, P LEE, E TI TRANSVERSE BEAM COMBINER FOR ILSE SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB Previous heavy-ion fusion driver system studies suggest that transverse beam combining significantly reduces driver cost. In a combiner, several beams are brought together to a common transport channel which accommodates the increased line charge density. Combining intense beams increases the transverse emittance mainly due to the heating of the beam by space charge forces as the non-uniform original beam configuration becomes more uniform. The combiner itself introduces additional aberrations, which are small for the present design. Those aberrations are due to the reduced available space for the focusing electrodes and reduced clearance from the beamlets to the surrounding electrodes, thereby generating field aberrations and larger image forces. These aberrations can also lead to particle loss. We have studied a particular design of the proposed induction linac system experiment (ILSE) combiner which is a first-order achromat that tolerates a rather large fractional head-to-tail momentum tilt of +/- 10%. Using a 2D particle-in-cell code we have found that similar to 7% of particles are lost in the combiner. The emittance growth after the combiner is large enough so that the emittance growth due to combiner aberrations is unimportant. The scaled projection to a driver shows the growth is small enough to be tolerated. At present, methods of improving combiner design to reduce particle loss and to minimize emittance growth are being studied. RP HAHN, K (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1665 EP 1670 DI 10.1007/BF02821265 PG 6 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000028 ER PT J AU LEE, EP AF LEE, EP TI LONGITUDINAL INSTABILITY IN HEAVY-ION FUSION INDUCTION LINACS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB An induction Linac accelerating a high-current pulse of heavy ions at subrelativistic velocities is predicted to exhibit unstable growth of current fluctuations. An overview is given of the mode character, estimates of growth rates, and their application to an IFE driver. The present and projected effort to understand and ameliorate the instability is described. This includes particle-in-cell simulations, calculation and measurements of impedance, and design of feedback controls. RP LEE, EP (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 9 TC 6 Z9 6 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 NOV PY 1993 VL 106 IS 11 BP 1679 EP 1685 DI 10.1007/BF02821267 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000030 ER PT J AU OLSON, CL HINSHELWOOD, DD HUBBARD, RF LAMPE, M NERI, JM OTTINGER, PF POUKEY, JW ROSE, DV SLINKER, SP STEPHANAKIS, SJ WELCH, DR YOUNG, FC AF OLSON, CL HINSHELWOOD, DD HUBBARD, RF LAMPE, M NERI, JM OTTINGER, PF POUKEY, JW ROSE, DV SLINKER, SP STEPHANAKIS, SJ WELCH, DR YOUNG, FC TI PHYSICS OF GAS-BREAKDOWN FOR ION-BEAM TRANSPORT IN GAS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID INTENSE AB Detailed analysis, experiments, and computer simulations are producing a new understanding of gas breakdown during intense ion beam transport in neutral gas. Charge neutralization of beam micro clumps is shown to limit the net clump potentals to a non-zero value phi(min), which can lead to divergence growth and axial energy spreading. At pressures greater than or equal to 1 Torr, plasma shielding should substantially reduce this effect. Current neutralization has been studied in experiments on the GAMBLE II accelerator. The importance of fast electrons (knock-ons and runaways) has been established in IPROP simulations, which are in agreement with the experiments. For light-ion fusion parameters with pressures greater than or equal to 1 Torr, very small net current fractions (<<1%) appear feasible, permitting ballistic transport in gas. Self-pinched transport requires higher net current fractions (greater than or equal to 2%) and preliminary IPROP code results indicate that this appears achievable for small-radius intense beams in lower-pressure gases (less than or equal to 1 Torr). Several self-pinched transport concepts look promising. The importance of these results for both light-ion fusion and heavy-ion fusion is discussed. C1 JAYCOR INC, VIENNA, VA 22182 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. MISSION RES CORP, ALBUQUERQUE, NM 87106 USA. RP OLSON, CL (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 12 TC 2 Z9 2 U1 0 U2 2 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 NOV PY 1993 VL 106 IS 11 BP 1705 EP 1711 DI 10.1007/BF02821270 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000033 ER PT J AU OSHIMA, J STEINMANN, KE CAMPISI, J SCHLEGEL, R AF OSHIMA, J STEINMANN, KE CAMPISI, J SCHLEGEL, R TI MODULATION OF CELL-GROWTH, P34(CDC2) AND CYCLIN-A LEVELS BY SV40 LARGE T-ANTIGEN SO ONCOGENE LA English DT Article ID DNA-REPLICATION; PROTEIN-KINASE; FISSION YEAST; INDEPENDENT GROWTH; HUMAN-FIBROBLASTS; SENESCENT HUMAN; C-FOS; CDC2; GENE; TEMPERATURE AB Immortalization of rat lung epithelial cells by either wild-type SV-40 T antigen, a mutant form of T antigen that cannot bind pRb, or a temperature-sensitive T antigen increased by five- to 20-fold the steady state levels of p34cdc2 and cyclin A, positive regulators of progression through the cell cycle. Increased abundance of p34cdc2 was not accompanied by equivalent increases in cdc2 mRNA, indicating that increased expression of p34cdc2 is due, at least partially, to post-transcriptional mechanisms. Levels of p34cdc2 and cyclin A protein in cells immortalized with a temperature-sensitive T antigen remained elevated at the restrictive temperature unless T antigen was reduced to levels significantly below those where proliferation ceased, indicating that these two functions can be dissociated. These results show that SV-40 T antigen can dramatically enhance the expression of certain cell cycle regulatory proteins by mechanisms that are independent of pRb binding and cell growth status. C1 HARVARD UNIV,SCH PUBL HLTH,DEPT MOLEC & CELLULAR TOXICOL,DIV BIOL SCI,665 HUNTINGTON AVE,BOSTON,MA 02115. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. FU NCI NIH HHS [NCI CA09235, NCI CA49749]; NIA NIH HHS [AG10004] NR 41 TC 39 Z9 39 U1 0 U2 1 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD NOV PY 1993 VL 8 IS 11 BP 2987 EP 2993 PG 7 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA MC093 UT WOS:A1993MC09300012 PM 8414501 ER PT J AU BURNETT, WM SILVERMAN, BG MONETTA, DJ AF BURNETT, WM SILVERMAN, BG MONETTA, DJ TI R-AND-D PROJECT APPRAISAL AT THE GAS RESEARCH-INSTITUTE .2. SO OPERATIONS RESEARCH LA English DT Article ID UNITED-STATES AB The Project Appraisal Methodology (PAM) was originally developed in 1975 and first run at the Gas Research Institute (GRI) in 1978 to help upper management select portfolios of research and development (R&D) projects to fund. Since that time, GRI has had 132 successful project commercializations and has achieved a success rate of 30% or over twice the documented industry average. GRI attributes its success to several decision making principles founded in management science. PAM is the cornerstone of GRI's R&D decision making process. In particular, GRI's projects are generating benefits for natural gas consumers and suppliers (savings plus sales increases) of $7-15 billion per year on an annual investment of about $1.6 billion and netting almost a 7 to 1 annual rate of return on their investment. Just in 1985-1989 these new technologies contributed to a savings of $70 billion ($78 billion, NPV, 1990$s) in the wellhead price of natural gas in the USA. Additionally, the application of management science at GRI has led to increases in available natural gas supplies (valued at $10-35 billion), a corresponding reduction in dependence on imports, major environmental and safety benefits, and vital changes in the position of the gas industry in the home heating, commercial cooking, and numerous other markets. C1 GEORGE WASHINGTON UNIV,INST ARTIFICIAL INTELLIGENCE,WASHINGTON,DC. US DOE,WASHINGTON,DC. RP BURNETT, WM (reprint author), GAS RES INST,RES & DEV PROGRAM,CHICAGO,IL 60631, USA. NR 31 TC 4 Z9 4 U1 1 U2 3 PU OPERATIONS RESEARCH SOC AMER PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2920 SN 0030-364X J9 OPER RES JI Oper. Res. PD NOV-DEC PY 1993 VL 41 IS 6 BP 1020 EP 1032 DI 10.1287/opre.41.6.1020 PG 13 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA MR003 UT WOS:A1993MR00300002 ER PT J AU EECKMAN, FH COLVIN, ME AXELROD, TS AF EECKMAN, FH COLVIN, ME AXELROD, TS TI COMPARISON OF 3 DIFFERENT METHODS FOR TARGET DETECTION AND TRACKING SO OPTICAL ENGINEERING LA English DT Article DE ACQUISITION; TRACKING; POINTING; RETINA; NEURAL NETWORK; SIGNAL-TO-NOISE RATIO; SEQUENTIAL HYPOTHESIS TESTING; MOTION DETECTION ID RETINA AB We introduce a biologically based method for motion detection and track initiation. The model consists of five hexagonally packed layers of single compartment neurons. The model mimics some of the processing in the retina and has localized interactions between cells in each layer. To evaluate the gain from using a biological model versus a more conventional approach we have compared the performance of three methods: simple intensity thresholding, the biologically inspired model, and an algorithm involving a truncated sequential probability ratio test. These methods were tested with a large number of real and simulated astronomical data and with a standard set of 50 images using targets at various SNRs. We discuss the importance of various aspects of the biological model for the overall performance on a target detection task. C1 SANDIA NATL LABS,DEPT 8117,LIVERMORE,CA 94551. RP EECKMAN, FH (reprint author), LAWRENCE LIVERMORE NATL LAB,COMPUTAT DIRECTORATE,INST SCI COMP RES,LIVERMORE,CA 94551, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 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 NOV PY 1993 VL 32 IS 11 BP 2741 EP 2748 DI 10.1117/12.148096 PG 8 WC Optics SC Optics GA MG773 UT WOS:A1993MG77300015 ER PT J AU BOGGAVARAPU, D JIN, R GRANTHAM, J HU, YZ DECOLSTOUN, FB LOWRY, CW KHITROVA, G KOCH, SW SARGENT, M GIBBS, HM CHOW, W AF BOGGAVARAPU, D JIN, R GRANTHAM, J HU, YZ DECOLSTOUN, FB LOWRY, CW KHITROVA, G KOCH, SW SARGENT, M GIBBS, HM CHOW, W TI INSTABILITIES OF A MICROCAVITY LASER WITH A WEAK INJECTED SIGNAL SO OPTICS LETTERS LA English DT Article ID SEMICONDUCTOR-LASER; LOCKING AB An external cw laser signal in injected into a microcavity laser, and the dynamics of the resulting coupled oscillator system are studied. By variation of the injection detuning and intensity, interesting nonlinear behavior and injection locking are experimentally observed. A theoretical model of this system based on coupled rate equations and including many-body gain effects is presented and yields good agreement with experiment. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BOGGAVARAPU, D (reprint author), UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721, USA. NR 11 TC 12 Z9 12 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 1 PY 1993 VL 18 IS 21 BP 1846 EP 1848 DI 10.1364/OL.18.001846 PG 3 WC Optics SC Optics GA MC897 UT WOS:A1993MC89700026 PM 19829424 ER PT J AU CHEN, MJ RATHKE, JW HUFFMAN, JC AF CHEN, MJ RATHKE, JW HUFFMAN, JC TI LOW-SYMMETRY IN THE CRYSTAL-STRUCTURE OF (OCTAPENTYLPHTHALOCYANINATO)(METHYL) RHODIUM(III) SO ORGANOMETALLICS LA English DT Note ID C-H BONDS AB The X-ray structure of (octa-n-pentylphth-alocyaninato)(methyl)rhodium(III) is reported. Out-of-plane twisting of only one of the four isoindole groups in the molecule combined with a saddle-shaped distortion from planarity results in an unusual structure of low symmetry. C1 INDIANA UNIV,CTR MOLEC STRUCT,BLOOMINGTON,IN 47405. RP CHEN, MJ (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 18 TC 14 Z9 15 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD NOV PY 1993 VL 12 IS 11 BP 4673 EP 4677 DI 10.1021/om00035a064 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA MH645 UT WOS:A1993MH64500064 ER PT J AU HENDRICKSON, B AF HENDRICKSON, B TI PARALLEL QR FACTORIZATION USING THE TORUS-WRAP MAPPING SO PARALLEL COMPUTING LA English DT Article DE QR FACTORIZATION; MULTIPROCESSOR COMPUTER; MESSAGE PASSING; TORUS-WRAP MAPPING; NCUBE 2; TIMING RESULTS ID LEAST-SQUARES PROBLEMS; HYPERCUBE MULTIPROCESSOR; MATRIX FACTORIZATION; ALGORITHMS; DECOMPOSITION; GIVENS; HOUSEHOLDER AB We present a parallel algorithm for the QR factorization of a dense matrix without column pivoting on a message passing multiprocessor. The algorithm combines the numerical efficiency of Householder reflections with the excellent communication properties of the torus-wrap mapping. Analytical results indicate that the communication overhead for this algorithm is less than that for other common approaches. Numerical results on an nCUBE 2 confirm the efficiency of our technique. RP HENDRICKSON, B (reprint author), SANDIA NATL LABS,DIV 1422,ALBUQUERQUE,NM 87185, USA. NR 35 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD NOV PY 1993 VL 19 IS 11 BP 1259 EP 1271 DI 10.1016/0167-8191(93)90030-O PG 13 WC Computer Science, Theory & Methods SC Computer Science GA MG806 UT WOS:A1993MG80600004 ER PT J AU ZHU, YM ZHANG, H SUENAGA, M WELCH, DO AF ZHU, YM ZHANG, H SUENAGA, M WELCH, DO TI PLANAR DEFECTS INDUCED BY HEAVY-ION IRRADIATION SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID YBA2CU3O7; SUPERCONDUCTOR; FILMS AB Irradiation of high T(c) superconductors by heavy ions generates amorphous columns. The creation of the columnar defects in YBa2CU3O7-delta often leads to the formation of wing-like planar faults attached to the columns. Such planar faults, which were characterized by electron microscopy combining nano-probe chemical analysis and high-resolution imaging and image simulation, were found to have various local structures. The majority of faults consists of one or two extra CuO planes inserted at the location of the original CuO single layer, resulting in a local structure of YBa2Cu4O8(124) or YBa2Cu5O9(125). Since these faults are chemical faults and are often bounded by sessile dislocations, the existence of such defects supports the idea that the formation of the amorphous columns involves partial epitaxial regrowth of the ion-induced molten region upon the heavy-ion irradiation. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RP ZHU, YM (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 18 TC 16 Z9 16 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD NOV PY 1993 VL 68 IS 5 BP 1079 EP 1089 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA MF591 UT WOS:A1993MF59100021 ER PT J AU LEE, WY BRISTOWE, PD GAO, Y MERKLE, KL AF LEE, WY BRISTOWE, PD GAO, Y MERKLE, KL TI THE ATOMIC-STRUCTURE OF TWIN BOUNDARIES IN RUTILE SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID RESOLUTION ELECTRON-MICROSCOPY; SIMULATION; DEFECTS; SCALE; TIO2 AB The equilibrium atomic structure of the (101) and (301) twin boundaries in rutile (TiO2) has been computed using an ionic shell model and compared with high resolution electron microscopy images of the same boundaries using image simulation. The lowest-energy (101) twin boundary structure is characterized by an in-plane translation of 1/2<111> which conserves the mirror symmetry of the metal sublattice but which imposes a displacement on the oxygen sublattice. The lowest-energy (301) twin-boundary structure involves no in-plane translation and is characterized by mirror symmetry of both the metal and the oxygen sublattices. The computed mirror symmetry of the metal sublattice for both twin boundaries is in agreement with the electron microscopy observations. A small distortion present in the simulated images is discussed in terms of the interatomic potential used in the calculations. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NEW MEXICO INST MIN & TECHNOL,DEPT MAT ENGN,SOCORRO,NM 87801. RP LEE, WY (reprint author), MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139, USA. NR 9 TC 28 Z9 28 U1 0 U2 8 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 NOV PY 1993 VL 68 IS 5 BP 309 EP 314 DI 10.1080/09500839308242908 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA MF260 UT WOS:A1993MF26000007 ER PT J AU MACINNIS, JM MCDONALD, KA SIGMAN, ME GREENBAUM, E AF MACINNIS, JM MCDONALD, KA SIGMAN, ME GREENBAUM, E TI SIMULTANEOUS MEASUREMENT OF PHOTOSYNTHETIC OXYGEN EVOLUTION AND CARBON-DIOXIDE ASSIMILATION UNDER ANAEROBIOSIS SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID ANOXIC ATMOSPHERE; QUOTIENTS; RATES; LIGHT AB Instrumentation has been developed for measuring absolute simultaneous assimilation of carbon dioxide and evolution of oxygen by photosynthetic systems in anaerobic atmospheres under flow conditions. Time-dependent photosynthetic quotients (PSQ) have been obtained. A detailed description of the instrument, including how it was constructed, calibrated and used for photosynthesis measurements, is presented. An important factor in the measurements was a clear understanding of the response time of the instrument. As with any flow system, flow rate, forward void volume and relative position of the O-2 and CO2 sensors in the gas train were crucial to performance. Response time was measured by step-function calibrations mimicking PSQ of unity. Oxygen was generated using an in-line electrolysis cell driven by a programmable constant current source. Carbon dioxide assimilation was mimicked with the use of a programmable electronic gas blending system. Simultaneous step functions of these two key photosynthetic parameters fully characterized the response time and sensitivity of the instrument. In this report, time-dependent PSQ for spinach leaf disks and the microalga Scenedesmus D-3 are reported. It is explicitly demonstrated that the transient approach to steady state is different for the two systems. Whereas the time-dependent PSQ for spinach depended on illumination history and reached a steady-state value less than 1, this was not the case for Scenedesmus. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. NR 19 TC 0 Z9 0 U1 0 U2 2 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 NOV PY 1993 VL 58 IS 5 BP 718 EP 723 DI 10.1111/j.1751-1097.1993.tb04958.x PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA ML057 UT WOS:A1993ML05700016 ER PT J AU CHUMANOV, G PICOREL, R TOON, S SEIBERT, M COTTON, TM AF CHUMANOV, G PICOREL, R TOON, S SEIBERT, M COTTON, TM TI STRUCTURAL AND FUNCTIONAL INTEGRITY OF THE PHOTOSYSTEM-II REACTION-CENTER ON SILVER ELECTRODES - FLUORESCENCE AND REDOX PROBES SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Note ID REACTION CENTER COMPLEX; SPECTROSCOPY; STABILITY; BACTERIAL; MEMBRANES; SPINACH; STATE AB Two simple and sensitive methods have been developed to assess the structural and functional integrity of isolated photosystem II reaction centers deposited on a roughened Ag electrode. Surface-enhanced resonance Raman scattering (SERRS) spectra useful for ascertaining structural information can be obtained from biological materials with this technique. The first method presented is based on observing differences in the fluorescence emission properties of reaction centers; these depend on the activity of the material. The second is based on the observation of changes in Raman bands that are sensitive to the redox state of cytochrome b(559) present in the reaction center complex. It is concluded that the conditions used here to obtain SERRS spectra do not affect the structural or functional integrity of the isolated photosystem II reaction center complex. In principle these approaches also could be used with other chromoproteins. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NATL RENEWABLE ENERGY LAB,PHOTOCONVERS BRANCH,GOLDEN,CO 80401. CSIC,ESTAC EXPTL AULA DEI,E-50080 ZARAGOZA,SPAIN. RI PICOREL, RAFAEL/K-7930-2014 OI PICOREL, RAFAEL/0000-0003-3791-129X NR 19 TC 10 Z9 10 U1 0 U2 2 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 NOV PY 1993 VL 58 IS 5 BP 757 EP 760 DI 10.1111/j.1751-1097.1993.tb04965.x PG 4 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA ML057 UT WOS:A1993ML05700023 ER PT J AU LIU, SH KLEMM, RA AF LIU, SH KLEMM, RA TI ENERGY-GAP STRUCTURE AND TUNNELING CHARACTERISTICS OF LAYERED SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID COPPER-OXIDE SUPERCONDUCTORS; ANISOTROPY; INTRALAYER; TC AB We have analyzed the energy gaps and density-of-states (DOS) of layered superconductors with two inequivalent layers in a unit cell along the c-axis. In the physically interesting parameter range where the interlayer hopping strengths of the quasiparticles are comparable to the critical temperature, the peaks in the DOS curve do not correspond to the order parameters (OP's) of each layer, but depend on the OP's and the interlayer hopping strengths in a complex manner. In contrast to a BCS superconductor, the DOS of layered systems have logarithmic singularities. Our simulated tunneling characteristics bear close resemblance to experimental results. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LIU, SH (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 15 TC 12 Z9 12 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 1 PY 1993 VL 216 IS 3-4 BP 293 EP 304 DI 10.1016/0921-4534(93)90073-Y PG 12 WC Physics, Applied SC Physics GA ME748 UT WOS:A1993ME74800008 ER PT J AU SCHLUETER, JA WELP, U WANG, HH GEISER, U WILLIAMS, JM BAUER, MJ CHO, JM SMART, JL TAHA, SA AF SCHLUETER, JA WELP, U WANG, HH GEISER, U WILLIAMS, JM BAUER, MJ CHO, JM SMART, JL TAHA, SA TI SYNTHESIS, SUPERCONDUCTIVITY AND ESR CHARACTERIZATION OF RB3C60 CRYSTALS SO PHYSICA C LA English DT Article ID ALKALI-METAL FULLERIDES; C-60; K3C60; RBXC60; STATE; C60 AB A one-step doping process of C60 crystals with three equivalents of rubidium to produce Rb3C60 crystals was developed. The T(c)'s for all Rb3C60 crystalline samples (aprproximately 30.5 K) were higher than those of the powder samples (28 to 29.6 K), but consistent with the reported four-probe resistivity result for a doped C60 crystal (transition midpoint = 30.2 K). High superconducting shielding fractions (between 60 and 90%) and sharp magnetic transition widths (DELTAT10-90 between approximately 3 K and 0.7 K) were observed for the samples doped with Rb at temperatures of 300 to 450-degrees-C. The doping process, as well as the composition, of these samples were studied with the use of an ESR spectrometer. Two major components, RbC60 and Rb3C60, were quantitatively characterized. The superconducting shielding fractions of these samples were found to be linearly correlated with the Rb3C60 content obtained from ESR measurements. Higher-temperature doping ( > 400-degrees-C) favored the formation of Rb3C60 at the expense of severe C60 crystal fragmentation. The optimal doping condition to produce Rb3C60 crystals was found to be around 300-degrees-C. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NR 33 TC 12 Z9 12 U1 1 U2 7 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 1 PY 1993 VL 216 IS 3-4 BP 305 EP 314 DI 10.1016/0921-4534(93)90074-Z PG 10 WC Physics, Applied SC Physics GA ME748 UT WOS:A1993ME74800009 ER PT J AU YEE, JH KHANAKA, GH WHITE, WT ORVIS, WJ AF YEE, JH KHANAKA, GH WHITE, WT ORVIS, WJ TI CALCULATIONS OF ENERGY-BANDS AND OPTICAL-PROPERTIES OF SOLID-STATE SUPERLATTICE MATERIALS SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article ID GASB SUPER-LATTICE; ELECTRONIC-PROPERTIES; HETEROSTRUCTURES AB The calculational results of the electronic and optical properties of some III-V semiconductor compounds obtained from the pseudopotential energy band method are compared with results obtained from other energy band calculational techniques and with experiments are compared. The calculation of real and imaginary parts of the optical refractive index of the GaAs-AlAs superlattice shows good agreement with experimental data. The calculations of the energy gap as a function of the number of atomic layers were carried out for GaAs-AlAs and GaSb InAs superlattices. The result obtained from these calculations shows that it is about 10 to 15% below the existing experimental data. However, if the band gap of experimental data is correctly normalized to the correct room temperature value, our calculations show excellent agreement with experimental data. Comparison of the results obtained from our calculations concerning the charge density and the charge confinement are carried out with the results obtained from other energy band calculation techniques. RP YEE, JH (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-156,LIVERMORE,CA 94550, USA. NR 13 TC 3 Z9 3 U1 1 U2 2 PU AKADEMIE VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD NOV PY 1993 VL 180 IS 1 BP 135 EP 145 DI 10.1002/pssb.2221800112 PG 11 WC Physics, Condensed Matter SC Physics GA MK645 UT WOS:A1993MK64500011 ER PT J AU REED, KJ CHEN, MH AF REED, KJ CHEN, MH TI RELATIVISTIC EFFECTS ON THE POLARIZATION OF LINE RADIATION EMITTED FROM HE-LIKE AND H-LIKE IONS FOLLOWING ELECTRON-IMPACT EXCITATION SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; RESONANCE TRANSITION; CROSS-SECTIONS; SUBLEVELS; BE+ AB The radiation emitted from ions excited by a directed electron beam can be strongly linearly polarized. According to Itikawa, Srivastava, and Sakimoto [Phys. Rev. A. 44, 7195 (1991)] the degree of polarization should be independent of atomic number in an isoelectronic sequence when expressed as a function of incident-electron energy in threshold units. We used a distorted-wave computer code to calculate cross sections for electron-impact excitation to specific magnetic sublevels of H- and He-like ions with Z = 13, 18, 22, 42, 56, 79, and 92. We found that the polarization of the resulting radiation is indeed independent of atomic number in the nonrelativistic limit. But when relativistic effects are properly taken into account, the polarization is markedly Z dependent. We show how the differences between the relativistic and nonrelativistic results vary with the incident-electron energy, as well as with increasing atomic number. RP REED, KJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 20 TC 66 Z9 66 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1993 VL 48 IS 5 BP 3644 EP 3651 DI 10.1103/PhysRevA.48.3644 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300036 ER PT J AU SHIMAKURA, N SUZUKI, S KIMURA, M AF SHIMAKURA, N SUZUKI, S KIMURA, M TI MOLECULAR TREATMENT OF ELECTRON-CAPTURE IN COLLISIONS OF O-5+ IONS WITH H-ATOMS AT ENERGIES FROM 6 EV/AMU TO 10 KEV/AMU - TRANSFER-EXCITATION PROCESSES SO PHYSICAL REVIEW A LA English DT Article AB Electron capture in collisions of O5+ ions with H atoms is investigated theoretically by using a semiclassical molecular-orbital method in the energy range from 6 eV/amu to 10 keV/amu. Electron translation effects are properly included (to the first order of relative velocity). The primary contributors to electron capture are O4+(2s4l) states. However, two-electron transfer-excitation processes are also important in the entire energy range studied. The contribution from these processes amounts to 50% of the total at 1 keV/amu; it remains at 27% even at studied energy as low as 6 eV/amu. The O4+(2p3p 3S) and O4+ (2p 3d 3P) states for the triplet and the O4+(2p3p 1S) state for the singlet contribute dominantly to the transfer-excitation process at low collision energies. Results of an analysis based on polarization parameters for electron capture are reported. C1 NIIGATA UNIV,FAC SCI,DEPT CHEM,NIIGATA 95021,JAPAN. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. ARGONNE NATL LAB,ARGONNE,IL 60439. RP SHIMAKURA, N (reprint author), NIIGATA UNIV,DEPT GEN EDUC,NIIGATA 95021,JAPAN. NR 15 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1993 VL 48 IS 5 BP 3652 EP 3662 DI 10.1103/PhysRevA.48.3652 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300037 ER PT J AU KELLER, N ANDERSSON, LR MILLER, RD WESTERLIND, M ELSTON, SB SELLIN, IA BIEDERMANN, C CEDERQUIST, H AF KELLER, N ANDERSSON, LR MILLER, RD WESTERLIND, M ELSTON, SB SELLIN, IA BIEDERMANN, C CEDERQUIST, H TI ANGULAR-DISTRIBUTIONS FOR DOUBLE-ELECTRON CAPTURE IN C4+-HE COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID 2-ELECTRON CAPTURE; LOW ENERGIES; C-4+; HE; SINGLE; IONS AB We have studied the angular distributions of double-electron capture in C4+ + He collisions in the 400-800-eV collision energy range. At all measured energies an interference pattern has been observed which is attributed to Stueckelberg oscillations. A comparison with calculated differential cross sections using a two-state diabatic potential matrix of Danared and Barany [J. Phys. B 19, 3109 (1986)] shows a reasonable agreement at 800 eV, while at lower energies the calculations show a shift of the peak positions towards larger angles. An alternative model by Barat et al. [J. Phys. B 23, 2811 (1990)], developed for collisions in the keV range, was also employed and was found to agree less well with our data, succinctly illustrating the increasing sensitivity to the ''exact'' potential shape with decreasing collision energy. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN. RP KELLER, N (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 14 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1993 VL 48 IS 5 BP 3684 EP 3688 DI 10.1103/PhysRevA.48.3684 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300042 ER PT J AU FINLAYSON, N BLOW, KJ BERNSTEIN, LJ DELONG, KW AF FINLAYSON, N BLOW, KJ BERNSTEIN, LJ DELONG, KW TI LOCALIZATION OF CHAOS IN THE DISCRETE NONLINEAR SCHRODINGER-EQUATION SO PHYSICAL REVIEW A LA English DT Article ID SELF-TRAPPING EQUATION; COUPLER AB We partition the perturbation phase space in the three-element discrete nonlinear Schrodinger equation into symmetric and antisymmetric subspaces. We then show that chaotic motion in the neighborhood of symmetric trajectories is confined to the antisymmetric space. Chaos occurs in the system at arbitrarily low levels of nonlinearity, in agreement with previous calculations. We call this phenomenon ''microchaos.'' C1 IDAHO STATE UNIV,DEPT MATH,POCATELLO,ID 83209. SANDIA NATL LABS,LIVERMORE,CA 94551. RP FINLAYSON, N (reprint author), BT LABS,IPSWICH IP5 7RE,ENGLAND. NR 13 TC 11 Z9 11 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 NOV PY 1993 VL 48 IS 5 BP 3863 EP 3869 DI 10.1103/PhysRevA.48.3863 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300064 ER PT J AU BOLDA, EL CHIAO, RY GARRISON, JC AF BOLDA, EL CHIAO, RY GARRISON, JC TI 2 THEOREMS FOR THE GROUP-VELOCITY IN DISPERSIVE MEDIA SO PHYSICAL REVIEW A LA English DT Article ID PROPAGATION AB Two theorems on the group velocity are presented in this paper. First a simple proof is given that for any dispersive dielectric, there must be a frequency at which the group velocity of an electromagnetic pulse becomes abnormal, i.e., greater than the vacuum speed of light, infinite. or negative, Second, at the frequency at which the attenuation (or gain) is a maximum, the group velocity must be abnormal (or normal). This second theorem is more widely applicable, e.g., to propagation in waveguides or through multilayer dielectrics. To illustrate these theorems we discuss dispersion in a medium with two resonance lines, one absorption and the other gain. We find that the group velocity is abnormal within the absorption line and in a transparent region outside the gain line. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BOLDA, EL (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 10 TC 125 Z9 125 U1 2 U2 9 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 NOV PY 1993 VL 48 IS 5 BP 3890 EP 3894 DI 10.1103/PhysRevA.48.3890 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300067 ER PT J AU BUDIL, KS SALIERES, P LHUILLIER, A DITMIRE, T PERRY, MD AF BUDIL, KS SALIERES, P LHUILLIER, A DITMIRE, T PERRY, MD TI INFLUENCE OF ELLIPTICITY ON HARMONIC-GENERATION SO PHYSICAL REVIEW A LA English DT Note AB We present results of experiments testing the influence of elliptical polarization on the production of high-order harmonics. Experiments were conducted both with a 600-nm, 1-psec dye laser and with an 825-nm, 140-fsec Cr:LiSrAlF6 (Cr:LiSAF) laser system, over a wide range of intensities and target gases (xenon, argon, and neon), using a detection system with a dynamical range of more than three orders of magnitude. The decrease of the harmonic strength with the ellipticity of the pump beam is rather slow for the low-order harmonics, and becomes much steeper for the high-order harmonics. We compare some of these data with the predictions of lowest-order perturbation theory. C1 CENS, SERV PHOTONS ATOMES & MOLEC, F-91191 GIF SUR YVETTE, FRANCE. RP BUDIL, KS (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. RI SALIERES, Pascal/L-7776-2014; L'Huillier, Anne/P-4379-2015 OI SALIERES, Pascal/0000-0001-5899-8246; L'Huillier, Anne/0000-0002-1335-4022 NR 12 TC 160 Z9 160 U1 3 U2 18 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1993 VL 48 IS 5 BP R3437 EP R3440 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300009 ER PT J AU SZABO, G WANG, JY BURGDORFER, J AF SZABO, G WANG, JY BURGDORFER, J TI ELLIPSOIDAL ANGULAR-DISTRIBUTION OF ELECTRONS EMITTED FROM RYDBERG ATOMS SO PHYSICAL REVIEW A LA English DT Note ID DIFFERENTIAL CROSS-SECTION; BORN APPROXIMATION; CONTINUUM STATES; COLLISIONS; CUSP; CAPTURE; FORM AB We investigate the energy and angular distribution of electrons emitted in fast collisions with neutral atoms from Rydberg states of the projectile into low-lying continuum states of the projectile. We find highly anisotropic, approximately ellipsoidal angular distributions for large principal quantum numbers (n congruent-to 10). The corresponding spherical multipole expansion contains contributions from high-order multipoles beta(k) at least up to k congruent-to 8 and large values of low-order multipoles 62 well beyond the limit for dipole-allowed transitions. Comparison with recent data for ion-solid collisions shows surprisingly good agreement. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SZABO, G (reprint author), ATOMKI,POB 51,H-4001 DEBRECEN,HUNGARY. NR 24 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1993 VL 48 IS 5 BP R3414 EP R3417 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF743 UT WOS:A1993MF74300003 ER PT J AU WOLF, RJ LEE, MW DAVIS, RC FAY, PJ RAY, JR AF WOLF, RJ LEE, MW DAVIS, RC FAY, PJ RAY, JR TI PRESSURE-COMPOSITION ISOTHERMS FOR PALLADIUM HYDRIDE SO PHYSICAL REVIEW B LA English DT Article ID HYDROGEN AB We present Monte Carlo calculations of the pressure-composition isotherms of palladium hydride using recently constructed embedded-atom-method potentials and a Monte Carlo method that allows for volume equilibration as the composition varies. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. RP WOLF, RJ (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29808, USA. NR 13 TC 39 Z9 39 U1 0 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 NOV 1 PY 1993 VL 48 IS 17 BP 12415 EP 12418 DI 10.1103/PhysRevB.48.12415 PG 4 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100004 ER PT J AU HERMSMEIER, BD FADLEY, CS SINKOVIC, B KRAUSE, MO JIMENEZMIER, J GERARD, P CARLSON, TA MANSON, ST BHATTACHARYA, SK AF HERMSMEIER, BD FADLEY, CS SINKOVIC, B KRAUSE, MO JIMENEZMIER, J GERARD, P CARLSON, TA MANSON, ST BHATTACHARYA, SK TI ENERGY-DEPENDENCE OF THE OUTER CORE-LEVEL MULTIPLET STRUCTURES IN ATOMIC MN AND MN-CONTAINING COMPOUNDS SO PHYSICAL REVIEW B LA English DT Article ID POLARIZED PHOTOELECTRON DIFFRACTION; PHOTOIONIZATION CROSS-SECTIONS; TRANSITION-METAL COMPOUNDS; THRESHOLD MEASUREMENTS; SYNCHROTRON RADIATION; PHOTOEMISSION-SPECTRA; MAGNETIC-ORDER; RARE-GASES; ARGON; EXCITATION AB We consider the energy dependence of the Mn 3s and 3p multiplets from gas-phase atomic Mn and crystalline MnF2 and KMnF3 over the range from x-ray photoelectron spectroscopy (XPS) energies down to energies near threshold. First comparing atomic and solid-state spectra for these multiplets permits concluding that the splittings in the compounds MnF2, MnO, and Cd0.3Mn0.7Te are highly atomic in character, with no significant effects due to extra-atomic screening. Measuring the energy dependence for atomic Mn, MnF2, and KMnF3 then shows for both the 3s and 3p multiplets that there is a decrease in the intensities of the higher-binding-energy quintet states relative to those of the corresponding septet states as the excitation energy is lowered. This effect on the quintet:septet branching ratios is also found to extend to rather high energies, with the ratios at the XPS limit of almost-equal-to 1400 eV above threshold being approximately 25-30 % greater than those at almost-equal-to 200 eV above threshold. We show that this energy-dependent final-state branching ratio is not due simply to spin-dependent dipole matrix elements as derived from single-configuration Hartree-Fock calculations. We suggest that this effect is caused by the sudden-to-adiabatic transition, which at lower energies favors the exchange-stabilized septet states that are the ground states of the ions formed. However, two prior theoretical models for such sudden-to-adiabatic intensity changes [Stohr, Jaeger, and Rehr, Phys. Rev. Lett. 51, 821 (1983) and Thomas, Phys. Rev. Lett. 54, 182 (1985)] were not found to describe our results well, particularly in the extension of the effect to higher energies. We consider qualitatively a configuration-interaction model with quintet-septet interchannel coupling that may better describe these effects and form the basis for more quantitative calculations. C1 UNIV HAWAII,DEPT CHEM,HONOLULU,HI 96822. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. GEORGIA STATE UNIV,DEPT PHYS & ASTRON,ATLANTA,GA 30303. RI Jimenez-Mier, Jose/A-5081-2009 OI Jimenez-Mier, Jose/0000-0002-5939-9568 NR 57 TC 39 Z9 39 U1 0 U2 14 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 1 PY 1993 VL 48 IS 17 BP 12425 EP 12437 DI 10.1103/PhysRevB.48.12425 PG 13 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100006 ER PT J AU KARPOV, VG AF KARPOV, VG TI QUASI-LOCALIZED SOUND EXCITATIONS IN DISORDERED-SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID SHARP DIFFRACTION PEAK; CHALCOGENIDE GLASSES; RANGE ORDER; MODES AB A theory of the low-frequency vibrational spectra in disordered systems is proposed and is based on accounting for small statistical fluctuations of the sound velocity. Long-range quasilocalized sound excitations of a circular nature are predicted. A circular excitation is localized during its lifetime inside an appropriate fluctuation that has the form of a thin tube bent into a ring. The density of states of such excitations estimated by the optimum fluctuation method depends exponentially on the frequency. The existence of a characteristic frequency is found at which the density of the quasilocalized states competes with that of phonons, providing a kind of anomaly in the total density of vibrational states. This frequency depends both on the correlation radius of the disorder and its amplitude. The theory predicts qualitatively a universal behavior of the density of vibrational states in various disordered systems possessing medium-range order. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Karpov, Victor/I-5169-2012; OI Karpov, Victor/0000-0003-2558-8368 NR 33 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 12539 EP 12549 DI 10.1103/PhysRevB.48.12539 PG 11 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100018 ER PT J AU COLLINS, GW MAIENSCHEIN, JL MAPOLES, ER TSUGAWA, RT FEARON, EM SOUERS, PC GAINES, JR FEDDERS, PA AF COLLINS, GW MAIENSCHEIN, JL MAPOLES, ER TSUGAWA, RT FEARON, EM SOUERS, PC GAINES, JR FEDDERS, PA TI ATOMIC ESR RELAXATION IN TRITIATED SOLID HYDROGEN SO PHYSICAL REVIEW B LA English DT Article ID D-T AB Electron-spin-resonance data taken at 9 GHz for hydrogen atoms in tritiated solid H-2, HD, D2, D-T, and T2 are presented. Both linewidths and longitudinal relaxation times have been measured simultaneously with J = 1 and hydrogen-atom concentrations. Data are presented to show that the line shapes can be inhomogeneous. Linewidth calculations using the weak dipolar interaction and hyperfine interaction are presented. Both predict Gaussian lines, and agreement is poor with the measured line shapes that are more often closer to Lorenzian. The Gaussian theories may be useful only for a few data points taken with high J = 1 concentration and at high temperature. A dilute-spin theory for atom-atom interactions when little J = 1 hydrogen is present, fails to work as well. The best line-shape agreement is obtained with a combination of J = 1 and atom concentrations, both to the half power. D2 fails conspicuously with every approach. The longitudinal relaxation times appear constant at 0.1-1 s except at low J = 1 concentrations, where the relaxation times increase. The electric-quadrupole mechanism is postulated for low J = 1 concentrations, but it does not show the expected J = 1 dependence. No information on ''hidden'' atoms is forthcoming from these data, but their presence is still a possibility. C1 UNIV HAWAII,DEPT PHYS,HONOLULU,HI 96822. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. RP COLLINS, GW (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 25 TC 14 Z9 14 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 1 PY 1993 VL 48 IS 17 BP 12620 EP 12627 DI 10.1103/PhysRevB.48.12620 PG 8 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100028 ER PT J AU ETCHEGOIN, P FUCHS, HD WEBER, J CARDONA, M PINTSCHOVIUS, L PYKA, N ITOH, K HALLER, EE AF ETCHEGOIN, P FUCHS, HD WEBER, J CARDONA, M PINTSCHOVIUS, L PYKA, N ITOH, K HALLER, EE TI PHONONS IN ISOTOPICALLY DISORDERED GE SO PHYSICAL REVIEW B LA English DT Article ID DIAMOND-TYPE SEMICONDUCTORS; BOND-CHARGE MODEL; TEMPERATURE-DEPENDENCE; LATTICE-DYNAMICS; BAND-GAPS; SI; CRYSTALS; EXCITATIONS; PERCOLATION; SCATTERING AB We report Raman- and neutron-scattering, infrared-transmission, and photoluminescence experiments in a series of isotopically enriched samples of Ge, including natural Ge and an alloy Ge-70(0.5) Ge-76(0.5). Emphasis is put on the study of disorder-induced effects on the phonon spectra. Results are compared to exhaustive theoretical calculations using the coherent-potential and self-consistent Born approximations. Reasonably good agreement is found between theory and experiment for the former. Data for the dependence of the energy of the E1 interband electronic gap on isotopic mass are also presented. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST NUKL FESTKORPERPHYS,W-7500 KARLSRUHE 1,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP ETCHEGOIN, P (reprint author), MAX PLANCK INST FESTKORPERFORSCH,HEISENBERGSTR 1,D-70569 STUTTGART,GERMANY. RI Itoh, Kohei/C-5738-2014 NR 54 TC 38 Z9 38 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 NOV 1 PY 1993 VL 48 IS 17 BP 12661 EP 12671 DI 10.1103/PhysRevB.48.12661 PG 11 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100033 ER PT J AU KOT, WK EDELSTEIN, NM ABRAHAM, MM BOATNER, LA AF KOT, WK EDELSTEIN, NM ABRAHAM, MM BOATNER, LA TI ZERO-FIELD SPLITTING OF CM3+ IN LUPO4 SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-PARAMAGNETIC-RES; YPO4; ZRSIO4; SCPO4 AB Electron-paramagnetic-resonance (EPR) spectroscopy has previously been employed in investigating excited levels of the ground-state manifold of the 5f7-configuration ion Cm3+ diluted in single crystals of the tetragonal-symmetry, zircon-structure hosts LUP04 and YPO4. The three intradoublet resonances that were observed in these earlier studies, however, were significantly broadened due to radiation damage arising from the use of the 18.1-yr half-life isotope Cm-244. In the present work, the isotope Cm-248 (T(1/2) = 3.4 X 10(5) yr) with a significantly lower specific activity has been incorporated in LuPO4-host single crystals in order to reduce the internal radiation-induced damage that can broaden both EPR and optical transitions. By employing these Cm-248-doped LuPO4 samples, it has been possible to observe an additional interdoublet transition for Cm3+, to perform more accurate measurements of the various intradoublet transitions at higher microwave frequencies, and to obtain optical absorption and fluorescence data for this system. These EPR and optical results have led to a more complete and accurate determination of the energy-level structure of Cm3+. Additionally, it has been possible to detect magnetic resonance transitions for the Cm3+ ion at room temperature. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP KOT, WK (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 27 TC 12 Z9 12 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 12704 EP 12712 DI 10.1103/PhysRevB.48.12704 PG 9 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100038 ER PT J AU SHAKED, H JORGENSEN, JD HUNTER, BA HITTERMAN, RL KINOSHITA, K IZUMI, F KAMIYAMA, T AF SHAKED, H JORGENSEN, JD HUNTER, BA HITTERMAN, RL KINOSHITA, K IZUMI, F KAMIYAMA, T TI DEFECT STRUCTURE AND SUPERCONDUCTING PROPERTIES OF LA1.8SRXCA1.2-XCU2O6-DELTA SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON POWDER DIFFRACTION; CRYSTAL-STRUCTURE; X-RAY; OXYGEN; LA2-XSRXCACU2O6; REFINEMENT; RIETVELD; CUPRATE; EXCESS; 60-K AB We have studied the relationship between structural defects and superconductivity in La1.8SrxCa1.2-xCu2O6-delta (0 less-than-or-equal-to x less-than-or-equal-to 0.8). The samples were prepared by synthesis under different oxygen Pressures, P(O2) = 50, 250, and 400 atm. Six of the seven samples were found to be superconducting with 22 less-than-or-equal-to T(c) less-than-or-equal-to 58 K. The structural properties were determined by neutron powder diffraction. The inter-CuO2-plane spacing, d(Cu-Cu), increases as Ca on the M(1) site between these planes is replaced by the larger Sr and La ions. The metal-site ordering is influenced by the oxygen pressure during synthesis. We have used the inter-CuO2-plane spacing, neutron-diffraction measurements of the scattering from the metal sites, and chemical constraints to determine the occupancies of La, Sr, and Ca at the M(1) site. For the same overall composition, higher oxygen pressure leads to a larger fraction of La on the M(1) site. Oxygen occupancy of the vacant O(3) site in the M(1) plane increases sharply when d(Cu-Cu) exceeds 3.5 angstrom. The superconducting transition temperature T(c) decreases systematically as the occupancy of O(3) increases for samples that would otherwise be expected to be superconducting. C1 NIPPON TELEGRAPH & TEL PUBL CORP, MUSASHINO ELECT COMMUN LAB, BASIC RES LABS, MUSASHINO, TOKYO 180, JAPAN. NATL INST RES INORGAN MAT, TSUKUBA, IBARAKI 305, JAPAN. UNIV TSUKUBA, INST MAT SCI, TSUKUBA, IBARAKI 305, JAPAN. NUCL RES CTR NEGEV, DEPT PHYS, IL-84190 BEER SHEVA, ISRAEL. BEN GURION UNIV NEGEV, DEPT PHYS, IL-84105 BEER SHEVA, ISRAEL. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 29 TC 25 Z9 25 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 12941 EP 12950 DI 10.1103/PhysRevB.48.12941 PG 10 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100067 ER PT J AU DORIN, VV KLEMM, RA VARLAMOV, AA BUZDIN, AI LIVANOV, DV AF DORIN, VV KLEMM, RA VARLAMOV, AA BUZDIN, AI LIVANOV, DV TI FLUCTUATION CONDUCTIVITY OF LAYERED SUPERCONDUCTORS IN A PERPENDICULAR MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; HIGH-TEMPERATURE SUPERCONDUCTORS; COPPER-OXIDE SUPERCONDUCTORS; CA-CU-O; RESISTIVE TRANSITION; TRANSPORT-PROPERTIES; SINGLE-CRYSTAL; MAGNETORESISTANCE; STATE; YBA2CU3O7 AB The leading contributions to the c-axis conductivity of layered superconductors arising from superconducting fluctuations of the order parameter are discussed for arbitrary intralayer scattering. The contributions from fluctuations of the normal quasiparticle density of states are shown to be opposite in sign to the Aslamazov-Larkin and Maki-Thompson contributions, leading to a peak in the overall c-axis resistivity rho(c)(T) above T(c). This peak is enhanced by a magnetic field H\\-c. With increasing H, the relative peak maximum in rho(c)(TH) increases in magnitude and is shifted to lower temperatures by an amount proportional to H-2 for weak fields and to H for strong fields. For comparison, the fluctuation conductivity parallel to the layers has been calculated including the fluctuations of the normal density of states. Our results are discussed in regard to recent experiments with YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+delta. C1 RUSSIAN ACAD SCI, INST HIGH PRESSURE PHYS, TROITSK 142092, RUSSIA. MOSCOW STEEL & ALLOYS INST, MOSCOW 117936, RUSSIA. RP ARGONNE NATL LAB, DIV MAT SCI, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Buzdin, Alexander/I-6038-2013 NR 54 TC 109 Z9 109 U1 4 U2 8 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 12951 EP 12965 DI 10.1103/PhysRevB.48.12951 PG 15 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100068 ER PT J AU NELSON, DR VINOKUR, VM AF NELSON, DR VINOKUR, VM TI BOSON LOCALIZATION AND CORRELATED PINNING OF SUPERCONDUCTING VORTEX ARRAYS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; FLUX-LINE LATTICE; SUPERFLUID-INSULATOR TRANSITION; LONGITUDINAL CRITICAL CURRENT; II SUPERCONDUCTORS; GLASS-TRANSITION; ANISOTROPIC SUPERCONDUCTORS; THERMAL FLUCTUATIONS; MELTING TRANSITION; COLUMNAR DEFECTS AB A theory of vortex pinning in high-temperature superconductors by correlated disorder in the form of twin boundaries, grain boundaries, and columnar defects is described. Mapping vortex trajectories onto boson world lines leads to a ''superfluid'' flux liquid at high temperatures, as well as low-temperature ''Bose-glass'' and ''Mott-insulator'' phases, in which the flux lines are localized. Currents perpendicular to the average vortex direction act like an electric field applied to charged bosons, while currents parallel to the field act like an imaginary magnetic field in this approach. We discuss the equilibrium and dynamic properties of these phases, and propose a scaling theory for the flux-liquid to Bose-glass transition, at which the linear resistivity vanishes. Although the Bose-glass predictions share some features with vortex-glass behavior predicted for point disorder, the response to tilting the magnetic field in the two cases differs dramatically, thus allowing the two theories to be distinguished experimentally. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP NELSON, DR (reprint author), HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138, USA. NR 98 TC 835 Z9 836 U1 7 U2 31 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 1 PY 1993 VL 48 IS 17 BP 13060 EP 13097 DI 10.1103/PhysRevB.48.13060 PG 38 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100080 ER PT J AU BRONOLD, FX SAXENA, A BISHOP, AR AF BRONOLD, FX SAXENA, A BISHOP, AR TI RADIATIVE DECAY OF POLARON-EXCITONS IN POLY(PHENYLENE VINYLENE) SO PHYSICAL REVIEW B LA English DT Note ID CONJUGATED POLYMERS; TRANS-POLYACETYLENE; SINGLET; DIODES; ORDER AB Starting from a nondegenerate-ground-state Su-Schrieffer-Heeger-like model Hamiltonian for poly(phenylene vinylene) we study the effect of electron-lattice coupling on the radiative recombination of polaron-excitons, using a lattice relaxation theory which explicitly takes into account multimode effects. We provide a detailed microscopic description of the decay process with emphasis Gn the fact that the phonon modes of the excited state-the polaron-exciton-are different from the ground-state phonon modes. We find that at zero temperature all accepting modes are within an almost dispersionless ground-state phonon branch. Therefore, as long as the polaron-exciton is in its vibrational ground state a simple, empirical, single-mode description of the recombination (photoluminescence) is feasible. However, the complicated phonon structure of the polaron-exciton-including localized as well as extended modes-renders an Einstein description of promoting modes meaningless. We thus expect that in processes where promoting modes are involved a single-mode model breaks down. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV BAUREUTH,INST PHYS,D-95440 BAYREUTH,GERMANY. RP BRONOLD, FX (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 22 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 13162 EP 13165 DI 10.1103/PhysRevB.48.13162 PG 4 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100099 ER PT J AU DARWIN, M DEAK, J HOU, L MCELFRESH, M ZELDOV, E CLEM, JR INDENBOM, M AF DARWIN, M DEAK, J HOU, L MCELFRESH, M ZELDOV, E CLEM, JR INDENBOM, M TI EFFECT OF TRANSPORT CURRENTS ON THE CRITICAL-STATE OF YBA2CU3O7-DELTA THIN-FILMS SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTORS AB After preparation of the remanent critical state, the normal component of the local time-dependent magnet field B(z) near the surface of a YBa2Cu3O7-delta thin film was measured before, during, and after the application of a transport current. The results are shown to be consistent with new calculations of B(z) for the thin film geometry. The calculated behavior in a thin film is shown to be substantially different from that of the Bean critical state in a long slab in a parallel field. In slab geometry, starting from the remanent critical state, \J(x)\ is always equal to J(c), whereas in thin films a continuous distribution of current densities J(x) is found. This feature results in a unique distribution of the magnetic field B(z) and unusual magnetic relaxation behavior in the presence of a transport current. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. MAX PLANCK INST MET RES,INST PHYS,W-7000 STUTTGART 80,GERMANY. RP DARWIN, M (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. RI Zeldov, Eli/K-1546-2012 OI Zeldov, Eli/0000-0002-8200-4974 NR 12 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 13192 EP 13195 DI 10.1103/PhysRevB.48.13192 PG 4 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100107 ER PT J AU SHAPIRO, SM SVENSSON, EC VETTIER, C HENNION, B AF SHAPIRO, SM SVENSSON, EC VETTIER, C HENNION, B TI UNIAXIAL-STRESS DEPENDENCE OF THE PHONON BEHAVIOR IN THE PREMARTENSITIC PHASE OF NI62.5AL37.5 SO PHYSICAL REVIEW B LA English DT Article ID THERMOELASTIC MARTENSITIC-TRANSFORMATION; NI-AL ALLOYS; GENERAL MECHANISM; ELECTRON-MICROSCOPY; ELASTIC-CONSTANTS; CRYSTAL-STRUCTURE; NUCLEATION; STABILITY AB Results of neutron-scattering experiments on a single crystal of Ni62.5Al37.5 as a function of uniaxial stress and temperature are reported. Emphasis is placed on the behavior of the low-energy part of the [zetazeta0]-TA2 phonon branch and its associated central peak. The dip in the phonon-dispersion curve is stress dependent and shifts from zeta=0.14 for zero stress to zeta=0.18 for an applied stress of 85 MPa at room temperature. As the temperature decreases the satellite shifts further, the phonon energy decreases considerably, and the linewidths become broad. These results are interpreted in terms of Clapp's localized soft-mode theory of nucleation in martensite. C1 AECL RES,CHALK RIVER LABS,CHALK RIVER KOJ 1J0,ON,CANADA. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. LAB L BRILLOUIN SPECTROMETRIE NEUTR,F-91190 GIF SUR YVETTE,FRANCE. RP SHAPIRO, SM (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 40 TC 26 Z9 26 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13223 EP 13229 DI 10.1103/PhysRevB.48.13223 PG 7 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300001 ER PT J AU ALTHOFF, JD ALLEN, PB WENTZCOVITCH, RM MORIARTY, JA AF ALTHOFF, JD ALLEN, PB WENTZCOVITCH, RM MORIARTY, JA TI PHASE-DIAGRAM AND THERMODYNAMIC PROPERTIES OF SOLID MAGNESIUM IN THE QUASI-HARMONIC APPROXIMATION SO PHYSICAL REVIEW B LA English DT Article ID GENERALIZED PSEUDOPOTENTIAL THEORY; DENSITY-FUNCTIONAL FORMULATION; TRANSITION; STABILITY; METALS AB Using a family of volume-dependent interatomic pair potentials derived from first principles, we calculate phonon properties and thermodynamic functions in the quasiharmonic approximation for the hcp and bcc phases of Mg over a wide range of volume and temperature. At atmospheric pressure, the calculated hcp phonon-dispersion curves and thermodynamic properties agree well with experiment. The pressure dependence of the Raman-active transverse-optical phonon mode also agrees well with very recent measurements. At high pressure, the temperature dependence of the hcp-bcc phase line is predicted, with values of the transition pressure ranging from 52 GPa at zero temperature to about 28 GPa at 1000 K. C1 SUNY STONY BROOK, DEPT PHYS, STONY BROOK, NY 11794 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RI Wentzcovitch, Renata/J-8768-2015 NR 26 TC 47 Z9 47 U1 1 U2 10 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 1 PY 1993 VL 48 IS 18 BP 13253 EP 13260 DI 10.1103/PhysRevB.48.13253 PG 8 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300005 ER PT J AU XU, CH FU, CL PEDRAZA, DF AF XU, CH FU, CL PEDRAZA, DF TI SIMULATIONS OF POINT-DEFECT PROPERTIES IN GRAPHITE BY A TIGHT-BINDING-FORCE MODEL SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; DIFFUSION AB Point-defect energetics and diffusion mechanisms in graphite are investigated using a semi-empirical tight-binding-force model. Possible diffusion processes associated with point-defect (i.e., vacancies and interstitials) and nondefect (i.e., atomic exchange) mechanisms are analyzed. It is found that self-diffusion in graphite in the direction parallel to the basal plane can be mediated by vacancies. However, since the calculated vacancy- and interstital-formation energies are nearly equal, it is argued that Frenkel pairs could exist as equilibrium defects. In this case, at high enough temperatures, self-diffusion parallel to the basal plane should occur by an interstitial mechanism because the migration energy of the interstitial is much lower. RP XU, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 18 TC 50 Z9 50 U1 1 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13273 EP 13279 DI 10.1103/PhysRevB.48.13273 PG 7 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300008 ER PT J AU SHABALOVSKAYA, S NARMONEV, A IVANOVA, O DEMENTJEV, A AF SHABALOVSKAYA, S NARMONEV, A IVANOVA, O DEMENTJEV, A TI ELECTRONIC-STRUCTURE AND STABILITY OF TI-BASED B 2 SHAPE-MEMORY COMPOUNDS - X-RAY AND ULTRAVIOLET PHOTOELECTRON-SPECTRA SO PHYSICAL REVIEW B LA English DT Article ID PHOTOIONIZATION CROSS-SECTIONS; TRANSITION-METALS; PHASE-TRANSITIONS; TITANIUM ATOMS; BAND-STRUCTURE; ALLOYS; NI; PD; ZR; CU AB The evolution of x-ray photoelectron and ultraviolet spectra and their modification at the phase transformation B2-B19(B19') of equiatomic TiM and quasibinary Ti(Ni,M) compounds, where M stands for Fe, Co, Ni, Pd, Pt, Au, and Cu, are presented. Investigation of x-ray photoemission spectroscopy includes valence bands, satellites, and core-level energy studies. As the atomic number of M increases (both within the same period and along the group), its d states become more localized, the maximum and the center of gravity of the d bands shift towards the bottom of the valence band, and the M contribution to the density of states (DOS) at the Fermi level, N(E(F)), degrades. The DOS localization is accompanied by a spatial localization of the M d electrons resulting in weakening of the d-d covalent bonds between the alloy components and, thus, destabilizing the B2 phase. While the contribution of M d electrons to the DOS at E(F) decreases, the Ti d electron portion increases to such an extent that, e.g., in TiPd and TiAu, the M contribution to N(E(F)) is almost negligible. The increase in core-level energy of all partners in compounds with respect to the elemental state is discussed in terms of covalency. The M d band localization leads to an increase of many-body interactions and, as a consequence, we managed to observe the Pd satellites without resonance enhancement. The B2-B19' phase transition is accompanied by modification of the DOS which affects the Ti d states in general. Having analyzed the electronic structure we introduce parameters controlling the B2 phase stability and suggest a phenomenological formula for the martensitic-transformation temperature which satisfactorily describes the experimental behavior. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. CENT BLACK MET RES INST,INST PRECISE ALLOYS,MOSCOW,RUSSIA. RP SHABALOVSKAYA, S (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 54 TC 31 Z9 32 U1 2 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13296 EP 13311 DI 10.1103/PhysRevB.48.13296 PG 16 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300011 ER PT J AU LIU, GK HUANG, J BEITZ, JV AF LIU, GK HUANG, J BEITZ, JV TI MICROSCOPIC NATURE OF INHOMOGENEOUS LINE BROADENING - ANALYSIS OF THE EXCITATION-LINE-NARROWING SPECTRA OF CF4+ IN CEF4 SO PHYSICAL REVIEW B LA English DT Article ID GLASSES; PHOSPHORESCENCE; CHROMOPHORES; TRANSITIONS; CRYSTALS; STATE AB Optical transitions between 5f states of tetravalent californium ion doped (1 metal-atom %) into CeF4 exhibit unusually large inhomogeneous broadening. The nature of the inhomogeneous broadening in this system has been studied by using fluorescence line narrowing and excitation line narrowing (ELN). It is shown that the energy distributions of different electronic states of Cf4+ in this system are correlated. In the ELN experiments, reduced excitation linewidth was obtained when selectively monitoring fluorescence emission. A linear relation was observed between the excitation energies of crystal-field states of the 5G4' manifold and the fluorescence wavelength monitored across the inhomogeneous profile of a 5G6'-F-7(6') transition. Analysis of these results by means of a microscopic theory proposed by Laird and Skinner [J. Chem. Phys. 90, 3880 (1989)] has provided insights into the structural properties of this disordered system. C1 UNIV WISCONSIN,DEPT PHYS & ASTRON,EAU CLAIRE,WI 54702. RP LIU, GK (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 32 TC 8 Z9 8 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 1 PY 1993 VL 48 IS 18 BP 13351 EP 13360 DI 10.1103/PhysRevB.48.13351 PG 10 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300018 ER PT J AU FIGGIS, BN REYNOLDS, PA HANSON, JC MUTIKAINEN, I AF FIGGIS, BN REYNOLDS, PA HANSON, JC MUTIKAINEN, I TI DOMAIN SEPARATION IN SINGLE-CRYSTAL (ND4)2CU(SO4)2.6D2O STUDIED BY X-RAY-DIFFRACTION AT HIGH-RESOLUTION SO PHYSICAL REVIEW B LA English DT Article ID CHARGE-DENSITY; TEMPERATURE AB Analysis of asymmetric line shapes of the synchrotron-generated x rays diffracted at 12 K from ca. 85% deuterated single-crystal copper ammonium Tutton salt, (ND4)2Cu(OD2)6(SO4)2, shows a breakdown in translational order that we interpret as regions of two monoclinic phases segregated on a scale of 100-200 unit cells in fixed relative orientation. The separation and orientation can be understood as the best epitactic fit between crystals differing very slightly in Jahn-Teller distortion at the Cu site. Previous studies have shown two distinct much larger Jahn-Teller distortions at the Cu site to be close in free energy. At 180 K more perfect order is regained, and the process is reversible. This indicates that the phase separation is a property of the macroscopically uniform single crystal, and is not caused by the crystal existing in two large as-grown parts differing in deuteration. At higher temperatures, to 320 K, linewidths again increase, but then with no asymmetry. The decrease in domain size may be connected with an approaching order-disorder transition, which is also reflected in changes in the cell constants and in the ammonium-ion librational motions. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. UNIV HELSINKI,DEPT CHEM,SF-00100 HELSINKI 10,FINLAND. RP FIGGIS, BN (reprint author), UNIV WESTERN AUSTRALIA,DEPT CHEM,NEDLANDS,WA 6009,AUSTRALIA. RI Hanson, jonathan/E-3517-2010 NR 12 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13372 EP 13377 DI 10.1103/PhysRevB.48.13372 PG 6 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300020 ER PT J AU MAITI, A FALICOV, LM AF MAITI, A FALICOV, LM TI STERN-GERLACH DYNAMICS OF MAGNETIC CLUSTERS SO PHYSICAL REVIEW B LA English DT Article ID SPIN RELAXATION; METAL-CLUSTERS AB A classical theory of the deflection of a single-domain ferromagnetic cluster in a Stern-Gerlach experiment is presented. Two cases are discussed in detail: (1) superparamagnetic relaxation, in which the thermal fluctuation of the cluster spin occurs on a time scale much smaller than the transit time of the cluster through the Stem-Gerlach apparatus; and (2) anisotropy-induced relaxation, in which the cluster is sufficiently isolated from the thermal bath during its transit through the apparatus so that its dynamics is governed by the interaction of the cluster spin with the anisotropic magnetic forces caused by the lattice and the shape of the cluster. Average spin orientation and average spin rocking during transit, as well as Stem-Gerlach intensity profiles, are presented. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP MAITI, A (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 15 TC 18 Z9 18 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 1 PY 1993 VL 48 IS 18 BP 13596 EP 13601 DI 10.1103/PhysRevB.48.13596 PG 6 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300048 ER PT J AU ZHU, XJ LOUIE, SG AF ZHU, XJ LOUIE, SG TI SPIN ORDERING OF 2-DIMENSIONAL ELECTRON LATTICES SO PHYSICAL REVIEW B LA English DT Article ID MONTE-CARLO; GROUND-STATE; SOLID HE-3; EXCHANGE AB The spin orderings of electrons interacting with the long-range 1/r Coulomb potential on various two-dimensional (2D) lattices are studied with a variational quantum Monte Carlo method. Within the trial wave functions considered, the ground state for a square electron lattice is ferromagnetic, while it is antiferromagnetic for a honeycomb lattice. On a rectangular lattice, the ground state changes from a ferromagnet to an antiferromagnet as the lattice varies from a square to a set of weakly interacting chains. These results indicate the importance of multiple-electron ring-exchange effects for the long-range Coulomb interaction on these 2D lattices. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP ZHU, XJ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 15 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 NOV 1 PY 1993 VL 48 IS 18 BP 13661 EP 13665 DI 10.1103/PhysRevB.48.13661 PG 5 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300056 ER PT J AU EMIN, D AF EMIN, D TI OPTICAL-PROPERTIES OF LARGE AND SMALL POLARONS AND BIPOLARONS SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTIVITY; TRANSITION; TRANSPORT; SOLIDS; MODEL AB In systems that are two and three dimensional electronically, a large polaron and a small polaron are distinct types of quasiparticles. The type of polaron formed depends on which electron-lattice interaction is of primary importance. A large polaron forms when the electron-lattice interaction due to the long-range Coulombic interactions between an electronic carrier and a solid's ions are of paramount importance. Competing effects then determine the radius of a large polaron. By contrast, a small polaron can form when a short-range electron-lattice interaction, such as the deformation-potential interaction, is dominant. A small polaron forms as its self-trapped carrier shrinks without limit until it is confined to a single site. Fundamental differences between large and small polarons produce optical spectra with distinguishing features. The absorption due to photoionization of a large polaron depends on products of the matrix elements for exciting a carrier from its self-trapped states to a free-carrier state and the density of these free-carrier states. These matrix elements fall sharply with increasing free-carrier wave vector k when kR > 1, where R is the large polaron's radius. A large polaron's photoionization produces a temperature-independent absorption band. This band is asymmetric with the absorption intensity on the high-energy side of the peak exceeding that on the low-energy side of the peak. By contrast, the small-polaron absorption arises as the self-trapped carrier is induced to transfer from its well-localized state to a localized state at an adjacent site. Phonon broadening of these local electronic energy levels produces the widths of these absorption bands. Small-polaron absorption bands are asymmetric with the absorption intensity below the peak energy exceeding that above the peak energy. With rising temperature the phonon broadening of the local electronic energy levels progressively broadens these absorption bands. In addition, the motion of a polaron in response to an ac field can produce a (Drude-like) free-carrier absorption. A large polaron's free-carrier absorption occurs at frequencies below the characteristic phonon frequency. By contrast, if the narrow bands that characterize small polarons did not result in their localization, their coherent motion would produce a free-carrier absorption that is restricted to frequencies far below the phonon frequency. The optical spectra of large and small bipolarons are similar to those for large and small polarons, respectively. Finally, carrier-induced absorption bands observed in semiconducting and superconducting cuprates are compared with the expectations of large- and small-polaronic absorptions. The high-frequency absorption bands are consistent with the existence of large-polaronic carriers. However, taken together, the free-carrier absorptions and the dc transport in the superconductors depart from expectations of independent polaronic carriers. It is suggested that if the carriers in the cuprates are polaronic, their transport in the superconductors' normal states is collective. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 34 TC 250 Z9 250 U1 3 U2 37 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 1 PY 1993 VL 48 IS 18 BP 13691 EP 13702 DI 10.1103/PhysRevB.48.13691 PG 12 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300060 ER PT J AU CLEM, JR HAO, ZD AF CLEM, JR HAO, ZD TI THEORY FOR THE HYSTERETIC PROPERTIES OF THE LOW-FIELD DC MAGNETIZATION IN TYPE-II SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; IRREVERSIBILITY AB We examine theoretically the following types of magnetization measurements of type-II superconductors: (1) zero-field cooled (ZFC), (2) field cooled with data collected on cooling (FCC), (3) field cooled with data collected on warming (FCW), and (4) remanent. In analyzing the irreversible behavior of the low-field dc susceptibilities, the important parameters are the critical current density, sample dimensions, and lower critical field. We point out that the irreversibility temperature is determined by the merging point of the FCC and ZFC, but not the FCW and ZFC, magnetization curves. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 26 TC 86 Z9 86 U1 3 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13774 EP 13783 DI 10.1103/PhysRevB.48.13774 PG 10 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300068 ER PT J AU BULAEVSKII, LN DAEMEN, LL MALEY, MP COULTER, JY AF BULAEVSKII, LN DAEMEN, LL MALEY, MP COULTER, JY TI LIMITS TO THE CRITICAL-CURRENT IN HIGH-T(C) SUPERCONDUCTING TAPES SO PHYSICAL REVIEW B LA English DT Article ID CRITICAL CURRENT-DENSITY; HIGH-TC SUPERCONDUCTORS; HIGH-TEMPERATURE SUPERCONDUCTORS; FLUX CREEP; MAGNETIC-FIELD; THIN-FILMS; NEUTRON-IRRADIATION; GRAIN-BOUNDARIES; SINGLE-CRYSTAL; CRITICAL-STATE AB Within the framework of the ''brick-wall'' model, we review in detail how various physical mechanisms could act to limit the critical current in high-T(c) superconducting tapes. The brick-wall model attempts to mimic in a simplified manner the complicated tape microstructure. We generalized it to take into account a distribution of grains sizes and possible different strengths of weak links between the grains and the existence of weak links associated with intergrain boundaries perpendicular to the plane of the tape. We discuss what experiments can distinguish between a situation where weak links limit the critical current, and another plausible scenario where intragranular pinning is the limiting factor. Our conclusion is that according to the available experimental data only a small, well-connected fraction of the high-J(c) tapes is effective in providing high critical current densities. For this fraction of the tape, pinning turns out to be the limiting mechanism. Finally, several possibilities for increasing the critical current of the high-T(c) superconducting tapes are discussed. RP BULAEVSKII, LN (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545, USA. RI Lujan Center, LANL/G-4896-2012 NR 66 TC 163 Z9 163 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 NOV 1 PY 1993 VL 48 IS 18 BP 13798 EP 13816 DI 10.1103/PhysRevB.48.13798 PG 19 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300071 ER PT J AU SHAMOTO, S SATO, M TRANQUADA, JM STERNLIEB, BJ SHIRANE, G AF SHAMOTO, S SATO, M TRANQUADA, JM STERNLIEB, BJ SHIRANE, G TI NEUTRON-SCATTERING STUDY OF ANTIFERROMAGNETISM IN YBA2CU3O6.15 SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC FORM-FACTOR; SPIN FLUCTUATIONS; SINGLE-CRYSTALS; PHASE-DIAGRAM; CU IONS; EXCITATIONS; DYNAMICS; LA2CUO4; ORDER; SUPERCONDUCTIVITY AB Both the static and dynamic properties of the antiferromagnetic state in YBa2Cu3O6.15 have been reinvestigated by neutron scattering. The crystal studied exhibited a Neel temperature of 410 +/- 3 K, with a continuous transition below 15 K to a magnetic structure with a doubled unit cell along the c axis. The Cu magnetic form factor has been extracted from magnetic Bragg peak intensities measured at 15 K, and it is shown to have the large anisotropy expected for a Cu 3d(x2-y2) state. The form-factor anisotropy can explain much of the Q dependence of the inelastic magnetic cross section that has been observed in superconducting YBa2Cu3O6+x. A search for the optical spin-wave modes at excitation energies up to 60 meV was unsuccessful. Analysis of acoustic spin-wave measurements yields an intralayer superexchange energy J(parallel-to) of 120 +/- 20 meV (without correction for quantum renormalization) with an anisotropy alpha(xy) = (7 +/- 1) X 10(-4), and an effective next-nearest-layer exchange J(perpendicular-to 2) of 0.04 +/- 0.01 meV. A lower limit for the intra-bilayer exchange, J(perpendicular-to 1), of 8 meV is established. Use of theoretical and experimental results for Q-integrated spin-wave intensities in the antiferromagnet, together with a crystal volume normalization based on phonon measurements, allows us to put previous measurements of spin fluctuations in superconducting YBa2Cu3O6.6 on an absolute scale. The results for the superconductor are shown to be consistent with the relaxation rates determined by nuclear magnetic resonance. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP SHAMOTO, S (reprint author), NAGOYA UNIV,DEPT PHYS,NAGOYA 46401,JAPAN. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 54 TC 155 Z9 155 U1 0 U2 15 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 1 PY 1993 VL 48 IS 18 BP 13817 EP 13825 DI 10.1103/PhysRevB.48.13817 PG 9 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300072 ER PT J AU LI, QA SUENAGA, M BULAEVSKII, LN HIKATA, T SATO, K AF LI, QA SUENAGA, M BULAEVSKII, LN HIKATA, T SATO, K TI THERMODYNAMICS OF SUPERCONDUCTING BI2SR2CA2CU3O10 IN THE CRITICAL FLUCTUATION REGION NEAR THE H(C2)(T) LINE SO PHYSICAL REVIEW B LA English DT Article ID CA-CU-O; HIGH-TEMPERATURE SUPERCONDUCTORS; MAGNETIC-FIELD; PERTURBATION-SERIES; II SUPERCONDUCTORS; SINGLE-CRYSTAL; FREE-ENERGY; HEAT; YBA2CU3O7-DELTA; TC AB We report a detailed study of the temperature and magnetic-field dependence of free energy, magnetization, and specific heat of superconducting Bi2Sr2Ca2Cu3O10 in the critical fluctuation region near H(c2)(T) line. Our approach is to apply the recently developed nonperturbative scaling theory (Tesanovic et al.) in high fields to describe the reversible magnetization data taken on a c-axis-oriented superconducting Bi2Sr2Ca2Cu3O10 thin tape. We find good agreement on some of the superconducting parameters obtained in the present study with those derived by applying the Ginzburg-Landau theory to our reversible magnetization data taken outside the critical fluctuation region. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. SUMITOMO ELECT IND LTD,OSAKA RES LABS,KONOHANA KU,OSAKA 554,JAPAN. RP LI, QA (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 26 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13865 EP 13870 DI 10.1103/PhysRevB.48.13865 PG 6 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300077 ER PT J AU KUNG, PJ MALEY, MP MCHENRY, ME WILLIS, JO MURAKAMI, M TANAKA, S AF KUNG, PJ MALEY, MP MCHENRY, ME WILLIS, JO MURAKAMI, M TANAKA, S TI FLUX-PINNING BY Y2BACUO5 PRECIPITATES AND FIELD-DRIVEN AND TEMPERATURE-DRIVEN PINNING CENTERS IN MELT-POWDER-MELT-GROWTH PROCESSED YBA2CU3O7 SO PHYSICAL REVIEW B LA English DT Article ID CRITICAL MAGNETIZATION CURRENTS; TRANSPORT CRITICAL-CURRENT; TC OXIDE SUPERCONDUCTORS; CRITICAL-CURRENT-DENSITY; CREEP ACTIVATION-ENERGY; BA-CU-O; II SUPERCONDUCTORS; SINGLE-CRYSTAL; ALIGNED YBA2CU3O7-DELTA; YBACUO SUPERCONDUCTORS AB Magnetic hysteresis, flux pinning, and flux creep in melt-powder-melt-growth processed YBa2Cu3O7 (Y 1:2:3) containing nominal 0, 25, and 40 mol% concentration Of Y2BaCuO5 (Y 2:1:1) inclusions were investigated. The strong pinning due to 2:1:1-phase precipitates in these samples allows for characterization of the hysteretic response as a function of pinning-site concentration over a large portion of magnetic-field-temperature space. We have found the following: (i) The curves of effective pinning energy U(eff) versus current density J reveal a diverging behavior of U(eff)(J) in the low-J regime. This supports the existence of a vortex-glass state, and is a signature of a vanishing resistance as the current density approaches zero. (ii) Both the U(eff) and the J values obtained from magnetic hysteresis loops were observed to increase with Y 2:1:1 concentration. The appearance of the butterfly-shaped (or ''fishtail'') hysteresis loops indicates a J(c) that is an increasing function of H (or B). Moreover, it has been demonstrated that the additional pinning leads to an increase in U(eff) in an H-T region in which the butterfly is developed. The derived effective pinning energy is fit, from the instantaneous experimental relaxation data, to the relation, U(eff)(J,T,H) = U(i)[G(T)/H(n)](J(i)/J)mu, where U(i) is the scale of the activation energy, G(T) = [1 - (T/T(x))2]m, and T(x), is close in value to T(irr) (H) (the irreversibility line of the material). This description breaks down in the vicinity of the ''butterfly'' peak. We observed two power-law regimes of J dependence of U(eff) which have mu values that agree qualitatively with the theoretical predictions (= 7/9 and 3/2) for a three-dimensional flux-line lattice. C1 INT SUPERCOND TECHNOL CTR,SUPERCONDUCT RES LAB,KOTO KU,TOKYO 135,JAPAN. CARNEGIE MELLON UNIV,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15213. RP KUNG, PJ (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,MS K763,LOS ALAMOS,NM 87545, USA. RI McHenry, Michael/B-8936-2009 NR 66 TC 96 Z9 98 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13922 EP 13938 DI 10.1103/PhysRevB.48.13922 PG 17 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300082 ER PT J AU MURANI, AP BOWDEN, ZA TAYLOR, AD OSBORN, R MARSHALL, WG AF MURANI, AP BOWDEN, ZA TAYLOR, AD OSBORN, R MARSHALL, WG TI EVIDENCE FOR LOCALIZED 4F STATES IN ALPHA-CE SO PHYSICAL REVIEW B LA English DT Note ID ELECTRON-SPECTROSCOPY; NEUTRON-SCATTERING; GAMMA TRANSITION; VOLUME COLLAPSE; CERIUM; ENERGY; PHOTOEMISSION AB Paramagnetic spectra of gamma and alpha-Ce measured at the same temperature using high-energy neutrons (approximately 2 eV) yield a 4f occupancy of approximately 0.8 in alpha-Ce. This phase of Ce also shows single-ion magnetic response but with a high Kondo energy of approximately 1800 K. In gamma-Ce we observe the F-2(5/2)-->F-2(7/2) spin-orbit (SO) excitation at approximately 260 meV. Remarkably, alpha-Ce also reveals a broad SO excitation shifted to a higher energy (approximately 450 meV). These observations reinforce the idea of localized 4f states in alpha-Ce and k-f hybridization as the driving mechanism for the gamma <----> alpha transition. C1 RUTHERFORD APPLETON LAB,ISIS FACIL,DIDCOT OX11 0QX,OXON,ENGLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HX,ENGLAND. RP MURANI, AP (reprint author), INST MAX VON LAUE PAUL LANGEVIN,156X,F-38042 GRENOBLE,FRANCE. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 23 TC 42 Z9 42 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 NOV 1 PY 1993 VL 48 IS 18 BP 13981 EP 13984 DI 10.1103/PhysRevB.48.13981 PG 4 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300090 ER PT J AU PARK, SJ KOUVEL, JS RADOUSKY, HB LIU, JZ AF PARK, SJ KOUVEL, JS RADOUSKY, HB LIU, JZ TI CROSS-FLUX EFFECT AS A VORTEX PINNING PROCESS IN YBA2CU3O7 AND Y0.8PR0.2BA2CU3O7 CRYSTALS SO PHYSICAL REVIEW B LA English DT Note AB In both crystals at 4.2 K, a trapped flux along the c axis is seen to inhibit the initial production of vortex flux by external fields (H(e)) in the a-b plane and to increase the retention of this vortex flux during subsequent cycling of H(e). Thus, the cross flux along c acts consistently as a pinning agent for the vortices aligned along a-b. The cross-flux effects in both these crystals are as pronounced as those observed in grain-oriented YBa2Cu3O7 [S. J. Park and J. S. Kouvel, Phys. Rev. B 48, 13 995 (1993)] and they persist undiminished to much larger cycling ranges of H(e) due to the stronger pinning of the cross flux itself. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP PARK, SJ (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680, USA. NR 2 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13998 EP 14000 DI 10.1103/PhysRevB.48.13998 PG 3 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300095 ER PT J AU LOONG, CK SODERHOLM, L AF LOONG, CK SODERHOLM, L TI RARE-EARTH ENERGY-LEVELS IN ND2CUO4, PR2CUO4, AND THE ELECTRON SUPERCONDUCTOR PR1.85CE0.15CUO4 SO PHYSICAL REVIEW B LA English DT Note ID CRYSTAL-FIELD EXCITATIONS; MAGNETIC-PROPERTIES; ND2-XCEXCUO4; SPLITTINGS; PRBA2CU3O7; ERBA2CU3O7; MODEL; ND AB The magnetic excitation spectra of the electron superconductor Pr1.85Ce0.15CuO4 and related parent compounds Pr2CuO4 and Nd2CuO4 have been determined by inelastic neutron scattering. We observe crystal-field transitions up to about 100 meV within the Pr3+ H-3(4) and Nd3+ I-4(9/2) Russell-Saunders ground multiplets in these materials. We find that a crystal-field treatment of the Pr3+ and Nd3+ ions can adequately explain the observed excitation spectra for both Pr2CuO4 and Nd2CuO4. The obtained crystal-field parameters are close to values estimated from a superposition-model calculation and Mossbauer data. The Pr3+ and Nd3+ wave functions are found to have significant (almost-equal-to 20%) admixture of some states belonging to higher J multiplets. The calculated contributions to the susceptibility of Pr2CuO4 and Nd2CuO4 from the crystal-field states agree well with experiments. The observed crystal-field transitions in the superconductor Pr1.85Ce0.15CuO4 shift to slightly lower energies and are broadened significantly relative to the present compound due to chemical disorder from Ce doping. RP LOONG, CK (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 28 TC 36 Z9 36 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 1 PY 1993 VL 48 IS 18 BP 14001 EP 14004 DI 10.1103/PhysRevB.48.14001 PG 4 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300096 ER PT J AU THOMPSON, JR OSSANDON, JG SUN, YR PARANTHAMAN, M BRYNESTAD, J AF THOMPSON, JR OSSANDON, JG SUN, YR PARANTHAMAN, M BRYNESTAD, J TI VORTEX FLUCTUATIONS, MAGNETIC PENETRATION DEPTH, AND HC2 IN HG-BASED AND TL-BASED HIGH-T(C) SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID OXYGEN DEFICIENCY; ANISOTROPY AB The presence of strong vortex fluctuation effects in two families of layered high-temperature superconductors (HgBa2CuO4+delta and Tl2Ca2Ba2Cu3O10+delta) is established from experimental studies of the equilibrium magnetization in the mixed state using the theory of Bulaevskii et al. Detailed information is obtained within the framework of this theory on the London penetration depth lambda(ab), upper critical field H(c2), and Ginzburg-Landau parameter kappa(ab) (With magnetic field perpendicular to the copper oxide planes) of these materials. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. UNIV TALCA,FAC NAT RESOURCES,TALCA,CHILE. RP THOMPSON, JR (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. RI Paranthaman, Mariappan/N-3866-2015; Chakoumakos, Bryan/A-5601-2016 OI Paranthaman, Mariappan/0000-0003-3009-8531; Chakoumakos, Bryan/0000-0002-7870-6543 NR 15 TC 53 Z9 53 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 NOV 1 PY 1993 VL 48 IS 18 BP 14031 EP 14034 DI 10.1103/PhysRevB.48.14031 PG 4 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300104 ER PT J AU HAIDENBAUER, J HOLINDE, K JOHNSON, MB AF HAIDENBAUER, J HOLINDE, K JOHNSON, MB TI COUPLED-CHANNEL POTENTIAL FOR NUCLEONS AND DELTAS SO PHYSICAL REVIEW C LA English DT Article ID ASYMPTOTIC D-STATE; BINDING-ENERGY; ISOBAR DEGREES; GROUND-STATE; DEUTERON; FREEDOM; FORCE AB We propose a nucleon-nucleon potential for which the NN, NDELTA, and DELTADELTA channels are coupled by energy-independent, nonlocal interactions constructed from meson-exchange interactions. The same vertex couplings that were utilized in earlier studies based on the Bonn single-channel NN potential are adopted. We arrive at our interaction by applying an extension of the folded diagram expansion to coupled channels. The coupled-channel formalism facilitates studies of the interplay between nucleon and delta degrees of freedom and bound-state properties of nuclear matter and finite nuclei. It also establishes a framework that might simplify the treatment of nucleon-nucleon scattering to energies above pion-production threshold. C1 FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5100 JULICH, GERMANY. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP GRAZ UNIV, INST THEORET PHYS, A-8010 GRAZ, AUSTRIA. NR 21 TC 39 Z9 40 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 NOV PY 1993 VL 48 IS 5 BP 2190 EP 2200 DI 10.1103/PhysRevC.48.2190 PG 11 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600014 ER PT J AU MOORE, EF LIANG, Y JANSSENS, RVF CARPENTER, MP AHMAD, I BEARDEN, IG DALY, PJ DRIGERT, MW FORNAL, B GARG, U GRABOWSKI, ZW HARRINGTON, HL HENRY, RG KHOO, TL LAURITSEN, T MAYER, RH NISIUS, D REVIOL, W SFERRAZZA, M AF MOORE, EF LIANG, Y JANSSENS, RVF CARPENTER, MP AHMAD, I BEARDEN, IG DALY, PJ DRIGERT, MW FORNAL, B GARG, U GRABOWSKI, ZW HARRINGTON, HL HENRY, RG KHOO, TL LAURITSEN, T MAYER, RH NISIUS, D REVIOL, W SFERRAZZA, M TI SPECTROSCOPY OF THE SUPERDEFORMED BAND IN PB-196 SO PHYSICAL REVIEW C LA English DT Article ID SHAPE ISOMERISM; LIFETIME MEASUREMENTS; NUCLEI; SPIN; ISOTOPES; INERTIA; HG-191; STATES; REGION AB The superdeformed band in 196Pb has been studied extensively using the reaction Er-170(Si-30,4n) at beam energies of 142, 146, and 151 MeV. New transitions have been added at the top and bottom of the previously known band. Gamma-ray directional correlations were measured for most of the transitions in the band verifying the expected stretched E2 character. The collectivity of the band has been measured using the Doppler shift attenuation method yielding an intrinsic quadrupole moment Q0 of 18.3 +/- 3.0 eb, in good agreement with theoretical predictions. The variations of the dynamic moment of inertia J(2) as a function of the rotational frequency homegaBAR have been studied and compared with cranked shell model calculations. The dependence of J(2) on mass for superdeformed bands in the Pb isotopes is also investigated. C1 TRIANGLE UNIV NUCL LAB,DURHAM,NC 27708. ARGONNE NATL LAB,ARGONNE,IL 60439. PURDUE UNIV,W LAFAYETTE,IN 47907. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV NOTRE DAME,NOTRE DAME,IN 46556. RP MOORE, EF (reprint author), N CAROLINA STATE UNIV,RALEIGH,NC 27695, USA. RI Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 42 TC 18 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP 2261 EP 2269 DI 10.1103/PhysRevC.48.2261 PG 9 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600022 ER PT J AU WHITTON, RM WELLER, HR HAYWARD, E DODGE, WR KUHN, SE AF WHITTON, RM WELLER, HR HAYWARD, E DODGE, WR KUHN, SE TI H-2(D,GAMMA)HE-4 POLARIZATION OBSERVABLES AT 20, 30, AND 50 MEV SO PHYSICAL REVIEW C LA English DT Article ID HE-4 D-STATE; ALPHA-PARTICLE; H-2(D->,GAMMA)HE-4 REACTION; ENERGIES; CAPTURE; NUCLEI AB Tensor and vector analyzing powers for the H-2(d, gamma)He-4 reaction have been obtained as a function of angle at E(d)(lab) = 20, 30, and 50 MeV. Differential cross sections were extracted at 30 and 50 MeV. Data for A(yy)(theta) and A(y)(theta) were obtained at all three energies, while T20(theta) was also measured at E(d)(lab) = 50 MeV. A direct capture calculation was performed and compared to the data. This calculation assumes point deuterons and that the reaction proceeds primarily via E2 radiation in this energy region. A value of 4% for the D-state probability arising from two-deuteron relative motion in the He-4 wave function was extracted by fitting the predictions of this model to the data. This calculation indicates that g-wave capture is significant at the energies of the present experiment, a result which is supported by a transition matrix element analysis of the data. The results of a microscopic 7-channel resonating group model (MCRGM) calculation are also compared to the data. This model takes all amplitudes having incoming angular momenta l less-than-or-equal-to 2 into account as well as the couplings to the n-He-3 and p-T channels. This microscopic calculation, which has produced reasonable agreement with the previous low energy data, predicts a value of 2.2% for the two-deuteron component of the D state in He-4. There is qualitative agreement with the present data. C1 TRIANGLE UNIV NUCL LAB, DURHAM, NC 27706 USA. DUKE UNIV, DURHAM, NC 27706 USA. NATL INST SCI & TECHNOL, GAITHERSBURG, MD 20899 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 33 TC 7 Z9 7 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP 2355 EP 2365 DI 10.1103/PhysRevC.48.2355 PG 11 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600033 ER PT J AU OSET, E STROTTMAN, D TOKI, H NAVARRO, J AF OSET, E STROTTMAN, D TOKI, H NAVARRO, J TI CORE POLARIZATION PHENOMENA IN PION-NUCLEUS CHARGE-EXCHANGE REACTIONS ABOVE THE DELTA-RESONANCE SO PHYSICAL REVIEW C LA English DT Article ID DELTA-(1232) RESONANCE; SCATTERING AB We study pion-induced single- and double-charge exchange reactions in nuclei at energies above the DELTA(3/2, 3/2) resonance using a microscopic, parameter-free Glauber approach. We introduce corrections in the amplitudes due to the medium polarization from an isospin-flip spin-nonflip source which dominates the reaction in the transitions studied and which has not previously been identified. Using an effective force derived from the study of electromagnetic transitions we obtained sizable reductions of the cross sections in both single- and double-charge exchanges, which bring the results of both reactions into close agreement with experiment. Predictions for angular distributions for both reactions on C-14 O-18, and Ca-42 targets are made which should serve as guidelines for experiments planned in this region and as further tests of the proposed isovector renormalization. C1 UNIV VALENCIA,CSIC,INST FIS CORPUSCULAR,CTR MIXTO,E-46100 BURJASSOT,SPAIN. UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. TOKYO METROPOLITAN UNIV,DEPT PHYS,TOKYO 192,JAPAN. UNIV VALENCIA,CSIC,DEPT FIS ATOM MOLEC & NUCL,CTR MIXTO,E-46100 BURJASSOT,SPAIN. RP OSET, E (reprint author), UNIV VALENCIA,CSIC,DEPT FIS TEOR,CTR MIXTO,E-46100 BURJASSOT,SPAIN. RI Toki, Hiroshi/P-8516-2015 NR 26 TC 32 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP 2395 EP 2402 DI 10.1103/PhysRevC.48.2395 PG 8 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600038 ER PT J AU DEAN, DJ UMAR, AS STRAYER, MR AF DEAN, DJ UMAR, AS STRAYER, MR TI DYNAMICAL EVOLUTION OF HADRONIC MATTER IN RELATIVISTIC COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; CHIRAL PHASE-TRANSITION; LATTICE GAUGE-THEORY; STRING-PARTON MODEL; NUMBER SUSCEPTIBILITY; SCREENING LENGTHS; QUARK PLASMA; QCD; TEMPERATURE AB We use the (3 + 1)-dimensional string-parton model to study relativistic collisions of heavy ions at CERN energies. Various inclusive hadronic observables, such as transverse energy, dE(T)/deta, and rapidity distributions, are calculated and compared with WA80 and NA35 data. We study secondary interactions that occur during the dynamical evolution, and show that these interactions tend to fill the midrapidity region. The dynamical evolution of the energy density of produced mesons and their thermodynamic properties are also studied. C1 VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. CALTECH,KELLOGG RADIAT LAB,PASADENA,CA 91125. RP DEAN, DJ (reprint author), OAK RIDGE NATL LAB,DIV PHYS,CTR COMPUTATIONALLY INTENS PHYS,OAK RIDGE,TN 37831, USA. RI Umar, Ahmet/J-4125-2013; OI Umar, Ahmet/0000-0002-9267-5253; Dean, David/0000-0002-5688-703X NR 59 TC 5 Z9 5 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP 2433 EP 2442 DI 10.1103/PhysRevC.48.2433 PG 10 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600043 ER PT J AU SCHNEDERMANN, E SOLLFRANK, J HEINZ, U AF SCHNEDERMANN, E SOLLFRANK, J HEINZ, U TI THERMAL PHENOMENOLOGY OF HADRONS FROM 200A GEV S+S COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; RELATIVISTIC NUCLEAR COLLISIONS; TRANSVERSE-MOMENTUM SPECTRA; COLLECTIVE FLOW; MULTIPARTICLE PRODUCTION; PARTICLE-PRODUCTION; SINGLE-PARTICLE; MIXED PHASE; MATTER; PROTON AB We develop a complete and consistent description for the hadron spectra from heavy ion collisions in terms of a few collective variables, in particular temperature, longitudinal, and transverse flow. To achieve a meaningful comparison with presently available data, we also include the resonance decays into our picture. To disentangle the influences of transverse flow and resonance decays in the m(T) spectra, we analyze in detail the shape of the m(T) spectra. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP SCHNEDERMANN, E (reprint author), UNIV REGENSBURG,INST THEORET PHYS,D-93040 REGENSBURG,GERMANY. NR 56 TC 579 Z9 584 U1 0 U2 6 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 NOV PY 1993 VL 48 IS 5 BP 2462 EP 2475 DI 10.1103/PhysRevC.48.2462 PG 14 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600046 ER PT J AU FONSECA, AC GIBSON, BF LEHMAN, DR AF FONSECA, AC GIBSON, BF LEHMAN, DR TI APPROXIMATE WAYS TO TREAT THE NUCLEON-NUCLEON TENSOR FORCE IN THE 4-NUCLEON BOUND-STATE SO PHYSICAL REVIEW C LA English DT Note ID HE-4 BINDING-ENERGY; EQUATIONS AB Several approximation methods are tested in the four-nucleon bound-state problem as a means to understand how the two-nucleon tensor force propagates through the underlying (2) + (2) and (3) + 1 subsystem amplitudes to yield a final four-nucleon binding energy. The aim is to show how to include as much of the nucleon-nucleon tensor force as possible in the dominant S-state component of the four-nucleon wave function for the purpose of optimizing the starting point in the iterative solution of the full problem. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV LISBON,CTR FIS NUCL,P-1699 LISBON,PORTUGAL. GEORGE WASHINGTON UNIV,DEPT PHYS,CTR NUCL STUDIES,WASHINGTON,DC 20052. RP FONSECA, AC (reprint author), DUKE UNIV,TRIANGLE UNIV NUCL LAB,BOX 90308,DURHAM,NC 27708, USA. RI Sa Fonseca, Antonio Carlos/M-3434-2013 OI Sa Fonseca, Antonio Carlos/0000-0002-5289-1162 NR 13 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 NOV PY 1993 VL 48 IS 5 BP 2528 EP 2530 DI 10.1103/PhysRevC.48.2528 PG 3 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600056 ER PT J AU BAXTER, AM BYRNE, AP DRACOULIS, GD JANSSENS, RVF BEARDEN, IG HENRY, RG NISIUS, D DAVIDS, CN KHOO, TL LAURITSEN, T PENTTILA, H HENDERSON, DJ CARPENTER, MP AF BAXTER, AM BYRNE, AP DRACOULIS, GD JANSSENS, RVF BEARDEN, IG HENRY, RG NISIUS, D DAVIDS, CN KHOO, TL LAURITSEN, T PENTTILA, H HENDERSON, DJ CARPENTER, MP TI SPECTROSCOPY OF PB-186 WITH MASS IDENTIFICATION SO PHYSICAL REVIEW C LA English DT Note ID NEUTRON-DEFICIENT; HIGH-SPIN; ISOTOPES; HG-186 AB Transitions in the very neutron-deficient isotope 186Pb have been identified in mass-gated, recoil-gamma, and recoil-gamma-gamma coincidence data obtained with a fragment mass analyzer and Compton-suppressed Ge-detector array. The results of the present work confirm and extend a band of levels tentatively proposed in earlier work done elsewhere, and provide a definitive mass assignment of the observed transitions. The band observed in 186Pb bears a very close resemblance to the yrast band in the isotone 184Hg, supporting the view that the 186Pb band is built upon a prolate structure. C1 AUSTRALIAN NATL UNIV,DEPT NUCL PHYS,RSPHYSSE,CANBERRA,ACT 0200,AUSTRALIA. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP BAXTER, AM (reprint author), AUSTRALIAN NATL UNIV,FAC SCI,DEPT PHYS & THEORET PHYS,CANBERRA,ACT 0200,AUSTRALIA. RI Dracoulis, George/A-8123-2008; 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 12 TC 58 Z9 58 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP R2140 EP R2143 PG 4 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600003 ER PT J AU HALBERT, EC NAZAREWICZ, W AF HALBERT, EC NAZAREWICZ, W TI DEFORMATION, PAIRING, AND MOMENTS OF INERTIA IN GROUND-STATE BANDS OF EVEN-EVEN RARE-EARTH NUCLEI SO PHYSICAL REVIEW C LA English DT Note ID ROTATIONAL BANDS; IDENTICAL BANDS; ALIGNMENT; ENERGIES; FIELD AB We discuss and interpret recently reported systematics of nuclide-to-nuclide variations in observed level spacings E(gamma)(4(1)+ --> 2(1)+) of even-even nuclei with 66 less-than-or-equal-to Z less-than-or-equal-to 76. We show that the reported empirical systematics can be explained theoretically by using Migdal's 1959 formula for nuclear moments of inertia. C1 OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. UNIV WARSAW,INST THEORET PHYS,PL-00681 WARSAW,POLAND. WARSAW UNIV TECHNOL,INST PHYS,PL-00661 WARSAW,POLAND. RP HALBERT, EC (reprint author), OAK RIDGE NATL LAB,DIV PHYS,POB 2008,OAK RIDGE,TN 37831, USA. NR 16 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP R2158 EP R2161 PG 4 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600008 ER PT J AU HOREN, DJ AUBLE, RL SATCHLER, GR BEENE, JR LEE, IY WU, CY CLINE, D DEVLIN, M IBBOTSON, R SIMON, MW AF HOREN, DJ AUBLE, RL SATCHLER, GR BEENE, JR LEE, IY WU, CY CLINE, D DEVLIN, M IBBOTSON, R SIMON, MW TI LIFETIME OF THE 3(1)- STATE AND OCTUPOLE COLLECTIVITY IN ZR-96 SO PHYSICAL REVIEW C LA English DT Note ID SCATTERING; NEUTRON; REGION AB The half-life of the 1897.2-keV, 3(1)- state in Zr-96 has been measured as (67.8 +/- 4.3) ps using the recoil-distance technique following inelastic excitation by 105-MeV S-32 ions. This is equivalent to a lifetime which is about 40% longer than those reported from two recent centroid-shift measurements. Our lifetime implies B(E3)up = (0.180 +/- 0.018) e2b3, i.e., (47.1 +/- 4.7) W.u., which is the most enhanced one-phonon g.s. --> 3(1)- transition strength observed in nuclei. A recent quasiparticle random-phase approximation (QRPA) calculation reproduces our result. Serious doubts are raised about an earlier conclusion that the reduced octupole transition probabilities of ''mirror'' nuclei correspond to the harmonic low for small amplitude vibrations. The enhanced B(E1:3(1)- --> 2(1)+) = (1.71 +/- 0.11) 10(-5) e2b deduced from the present work is consistent with appreciable octupole deformation. The measured B(E3)up resolves problems in the interpretation of the isospin character of the E3 transition derived from inelastic scattering data. C1 UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627. RP HOREN, DJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Devlin, Matthew/B-5089-2013 OI Devlin, Matthew/0000-0002-6948-2154 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1993 VL 48 IS 5 BP R2131 EP R2134 PG 4 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600001 ER PT J AU HUGHES, JR BECKER, JA BRINKMAN, MJ HENRY, EA HOFF, RW STOYER, MA WANG, TF CEDERWALL, B DELEPLANQUE, MA DIAMOND, RM FALLON, P LEE, IY OLIVEIRA, JRB STEPHENS, FS CIZEWSKI, JA BERNSTEIN, LA DRAPER, JE DUYAR, C RUBEL, E KELLY, WH VO, D AF HUGHES, JR BECKER, JA BRINKMAN, MJ HENRY, EA HOFF, RW STOYER, MA WANG, TF CEDERWALL, B DELEPLANQUE, MA DIAMOND, RM FALLON, P LEE, IY OLIVEIRA, JRB STEPHENS, FS CIZEWSKI, JA BERNSTEIN, LA DRAPER, JE DUYAR, C RUBEL, E KELLY, WH VO, D TI LIFETIME MEASUREMENTS IN THE REGULAR DELTA-I = 1 OBLATE BAND IN PB-197 SO PHYSICAL REVIEW C LA English DT Note ID DEFICIENT PB ISOTOPES; COLLECTIVE BANDS; MASS REGION; MOMENTS; NUCLEI; STATES AB Lifetimes of states in the regular DELTAI = 1 band in 197Pb have been measured with the Doppler-shift attenuation method. Excited states in 197Pb were populated using the Sm-154(48Ca, 5n) reaction at E(b) = 210 MeV. The target consisted of 1 mg/cm2 Sm-154 evaporated onto a 10 mg/cm2 Au backing. Discernible lineshapes for gamma rays in the energy range 300 < E(gamma) < 500 keV in the regular band were observed in a spectroscopic study with the 20 Ge-detector array, HERA. Level lifetimes were obtained from a lineshape analysis. Averaged reduced transition strengths, B(M1) approximately 1.7 W.u. and B(E2) approximately 18 W.u., are deduced and these are compared with theoretical predictions for the suggested configuration of this band. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUTGERS UNIV, NEW BRUNSWICK, NJ 08903 USA. UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. IOWA STATE UNIV SCI & TECHNOL, AMES, IA 50010 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RI Oliveira, Jose Roberto/J-3124-2012; Cederwall, Bo/M-3337-2014 OI Oliveira, Jose Roberto/0000-0003-1362-7382; Cederwall, Bo/0000-0003-1771-2656 NR 31 TC 16 Z9 17 U1 2 U2 4 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 NOV PY 1993 VL 48 IS 5 BP R2135 EP R2139 DI 10.1103/PhysRevC.48.R2135 PG 5 WC Physics, Nuclear SC Physics GA MH136 UT WOS:A1993MH13600002 ER PT J AU BAUER, DA BELCINSKI, R BERG, RC BINGHAM, HH BUCHANAN, CD CALDWELL, DO CHUN, SB CLARK, AR DAHL, OI DAOUDI, M EASTMAN, JJ EISNER, AM FAIRFIELD, KH GODFREY, G GREENBAUM, GS HAUPTMAN, JM HOFMANN, W HOLTZAPPLE, RL KHACHERYAN, S KNOPFLE, KT KOFLER, RR LAMBERT, DJ LAYTER, JG LIN, WT LOKEN, SC LU, A LYNCH, GR LYS, JE MADARAS, RJ MASEK, GE MILLER, ES NICOL, NA NYGREN, DR OYANG, JY PAAR, HP PALOUNEK, APT PELLETT, DE RONAN, MT ROSS, RR SHAPIRO, G SHEN, BC STEPHENS, RW STEVENSON, ML STRAUSS, MG SULLIVAN, MK VERNON, W WANG, EM WANG, YX WENZEL, WA YAMAMOTO, H YELLIN, SJ YOST, GP ZAPALAC, G ZEITLIN, C AF BAUER, DA BELCINSKI, R BERG, RC BINGHAM, HH BUCHANAN, CD CALDWELL, DO CHUN, SB CLARK, AR DAHL, OI DAOUDI, M EASTMAN, JJ EISNER, AM FAIRFIELD, KH GODFREY, G GREENBAUM, GS HAUPTMAN, JM HOFMANN, W HOLTZAPPLE, RL KHACHERYAN, S KNOPFLE, KT KOFLER, RR LAMBERT, DJ LAYTER, JG LIN, WT LOKEN, SC LU, A LYNCH, GR LYS, JE MADARAS, RJ MASEK, GE MILLER, ES NICOL, NA NYGREN, DR OYANG, JY PAAR, HP PALOUNEK, APT PELLETT, DE RONAN, MT ROSS, RR SHAPIRO, G SHEN, BC STEPHENS, RW STEVENSON, ML STRAUSS, MG SULLIVAN, MK VERNON, W WANG, EM WANG, YX WENZEL, WA YAMAMOTO, H YELLIN, SJ YOST, GP ZAPALAC, G ZEITLIN, C TI EVIDENCE FOR SPIN-ONE RESONANCE PRODUCTION IN THE REACTION GAMMA-GAMMA-ASTERISK-]PI+PI-PI-0-PI-0 SO PHYSICAL REVIEW D LA English DT Article ID 300 GEV/C; RADIATIVE DECAY; COLLISIONS; MESONS; STATES; THRESHOLD; SYSTEM; HYBRID AB Using data from the TPC/Two-Gamma experiment at the SLAC e+e- storage ring PEP, a C = +1 resonance has been observed in the pi+pi-pi0gamma final state resulting from the fusion on one nearly real and one quite virtual photon. The actual decay channel is probably pi+pi-pi0pi0, where one final-state photon is not detected, and the mass of the fully reconstructed state would be approximately 1525 MeV. A four-pion decay mode in turn implies that the resonance has even isospin. The nonobservation of this R (1525) when both initial-state photons are nearly real suggests a spin-1 assignment. Since the large measured value of the product of the branching ratio into pi+pi-pi0pi0 and the gammagamma coupling makes it unlikely that this state is the mostly ssBAR f1(1510), its interpretation may lie outside of conventional meson spectroscopy. There is a second, less-significant enhancement observed in the same reaction at a four-pion mass centered around 2020 MeV. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF STANFORD,INTERCAMPUS INST RES PARTICLE ACCELERATORS,STANFORD,CA 94305. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV MASSACHUSETTS,AMHERST,MA 01003. MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP BAUER, DA (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 38 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 3976 EP 3986 DI 10.1103/PhysRevD.48.3976 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000010 ER PT J AU WHITE, HB STREETS, K BOCA, G GEORGIOPOULOS, C GOLDMAN, JH HAGOPIAN, S HAGOPIAN, V JOHNSON, KF LEVINTHAL, D LOPEZ, F SAWYER, HL STREETS, J CRISLER, M LATHROP, A PORDES, S CUMMINGS, M GUSTAFSON, HR AF WHITE, HB STREETS, K BOCA, G GEORGIOPOULOS, C GOLDMAN, JH HAGOPIAN, S HAGOPIAN, V JOHNSON, KF LEVINTHAL, D LOPEZ, F SAWYER, HL STREETS, J CRISLER, M LATHROP, A PORDES, S CUMMINGS, M GUSTAFSON, HR TI MASSIVE HADRON PAIR PRODUCTION BY 800 GEV C PROTONS ON NUCLEAR TARGETS SO PHYSICAL REVIEW D LA English DT Article ID TRANSVERSE-MOMENTUM; LEPTON SCATTERING; DEPENDENCE AB We report data on proton-nucleon collisions obtained on Fermilab experiment E711, in which high transverse momentum hadrons are produced near 90-degrees in the proton-nucleon center of mass forming high mass states, using an 800 GeV/c proton beam on targets of beryllium, aluminum, iron, and tungsten. The data presented cover the mass range from 7 to 15 GeV/c2, the three dihadron charge states + + -, and - -, and parton-parton scattering angles up to costheta* = 0.50. We present the differential dihadron cross section, as well as the angular and charge dependence of the measurement. The cross section as a function of the parton-parton scattering angle for the three charge states is shown to vary linearly with the value of the atomic weight. While the angular distributions are shown to be independent of the target type, a small dependence on the charge state of the distributions is observed. The data are shown to be in good agreement with extrapolations from previous measurements and phenomenological QCD calculations. C1 FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV MICHIGAN,ANN ARBOR,MI 48109. RP WHITE, HB (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. OI Sawyer, Lee/0000-0001-8295-0605 NR 29 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 3996 EP 4006 DI 10.1103/PhysRevD.48.3996 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000012 ER PT J AU RIZZO, TG AF RIZZO, TG TI EXTRACTION OF COUPLING INFORMATION FROM Z' -] JJ SO PHYSICAL REVIEW D LA English DT Article ID FUTURE HADRON COLLIDERS; LEFT-RIGHT MODEL; GAUGE BOSONS; PARTON DISTRIBUTIONS; FERMION PRODUCTION; POLARIZATION; ORIGIN; DECAYS; MASS AB An analysis by the ATLAS Collaboration has recently shown, contrary to popular belief, that a combination of strategic cuts, excellent mass resolution, and detailed knowledge of the QCD backgrounds from direct measurements can be used to extract a signal in the Z'-->jj channel for certain classes of extended electroweak models. We explore the possibility that the data extracted from Z dijet peak will have sufficient statistical power as to supply information on the couplings of the Z' provided it is used in conjunction with complementary results from the Z'-->l+l- ''discovery'' channel. We show, for a 1 TeV Z' produced at the SSC, that this technique can provide a powerful new tool with which to identify the origin of Z'. Extensions of this analysis to the CERN LHC as well as for a more massive Z' are discussed. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 41 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 4236 EP 4242 DI 10.1103/PhysRevD.48.4236 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000037 ER PT J AU DINE, M LEIGH, R KAGAN, A AF DINE, M LEIGH, R KAGAN, A TI FLAVOR SYMMETRIES AND THE PROBLEM OF SQUARK DEGENERACY SO PHYSICAL REVIEW D LA English DT Article ID SUPERSYMMETRY BREAKING; CP-VIOLATION; SUPERGRAVITY; MODELS; UNIFICATION AB If supersymmetry exists at low energies, it is necessary to understand why the squark spectrum exhibits sufficient degeneracy to suppress flavor-changing neutral currents. In this article, we point out that gauged horizontal symmetries can yield realistic quark mass matrices, while at the same time giving just barely enough squark degeneracy to account for neutral K-meson phenomenology. This approach suggests likely patterns for squark masses, and indicates that there could be significant supersymmetric contributions to B-BBAR and D-DBAR mixing and CP violation in the K and B systems. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP DINE, M (reprint author), UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064, USA. NR 37 TC 215 Z9 215 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 1 PY 1993 VL 48 IS 9 BP 4269 EP 4274 DI 10.1103/PhysRevD.48.4269 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000040 ER PT J AU KIM, S SINCLAIR, DK AF KIM, S SINCLAIR, DK TI LIGHT HADRON SPECTRUM OF QUENCHED QCD ON A 32(3) X 64 LATTICE SO PHYSICAL REVIEW D LA English DT Article ID STAGGERED FERMIONS AB We have measured the spectrum of light hadrons (pi, rho, a1, b1, f0/a0, N, and DELTA) in the quenched approximation to lattice QCD on a 32(3) x 64 lattice at beta = 6/g2 = 6.5. For these measurements we have used staggered quark propagators from two different wall sources. The quark masses used were m(q) = 0.01, m(q) = 0.005, and m(q) = 0.025 (lattice units), allowing an m(pi)/m(rho) as low as approximately 0.4. We were able to verify the PCAC relation m(pi)2 is-proportional-to m(q), and estimate f(pi) = 93(4) MeV. RP ARGONNE NATL LAB, DIV HEP, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 28 TC 21 Z9 21 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 4408 EP 4418 DI 10.1103/PhysRevD.48.4408 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000054 ER PT J AU BERNARD, C BLUM, T DEGRAND, TA DETAR, C GOTTLIEB, S KRASNITZ, A SUGAR, RL TOUSSAINT, D AF BERNARD, C BLUM, T DEGRAND, TA DETAR, C GOTTLIEB, S KRASNITZ, A SUGAR, RL TOUSSAINT, D TI FINITE-SIZE AND QUARK MASS EFFECTS ON THE QCD SPECTRUM WITH 2 FLAVORS SO PHYSICAL REVIEW D LA English DT Article ID LATTICE GAUGE-THEORY; QUANTUM-FIELD THEORIES; STAGGERED FERMIONS; HADRON MASSES; MONTE-CARLO; NUMERICAL-SIMULATION; VOLUME DEPENDENCE; SUSSKIND FERMIONS; ENERGY-SPECTRUM; COMPLEX ZEROS AB We have carried out spectrum calculations with two flavors of dynamical Kogut-Susskind quarks on four lattice sizes from 8(3) X 24 to 16(3) X 24 at couplings that correspond to chiral symmetry restoration for a lattice with six time slices. We estimate that the linear spatial sizes of the lattices range from 1.8 to 3.6 fm. We find significant finite-size effects for all particles between the smallest and largest volume with the larger quark mass that we study, am(q) = 0.025, where a is the lattice spacing. The nucelon experiences the largest effect of about 6%. We also study a lighter quark mass, am(q) = 0.0125, on the two largest lattices. Effects of the dynamical and valence quark masses on the hadron spectrum are studied both directly, by comparing the two simulations, and by extracting mass derivatives from the correlation functions. We do not find much improvement in the nucleon to rho mass ratio as we decrease the quark mass at this lattice spacing. Finally, we report on an unsuccessful attempt to see effects of the rho-->2pi decay on the rho mass, and on studies of Wilson and Kogut-Susskind hadron masses with large valence quark masses. C1 UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. SWISS FED INST TECHNOL, INTERDISZIPLINARES PROJEKTZENTRUM SUPERCOMP, CH-8092 ZURICH, SWITZERLAND. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. OI DeTar, Carleton/0000-0002-0216-6771 NR 62 TC 31 Z9 31 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 4419 EP 4434 DI 10.1103/PhysRevD.48.4419 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000055 ER PT J AU RIZZO, TG AF RIZZO, TG TI CONSTRAINTS ON NEW PHYSICS FROM FERMILAB TEVATRON DIJET DATA SO PHYSICAL REVIEW D LA English DT Note ID LEFT-RIGHT MODEL; STANDARD MODEL; PHENOMENOLOGICAL ASPECTS; AXIGLUON PRODUCTION; PBARP COLLISIONS; GAUGE BOSONS; EP COLLIDERS; COLOR; DECAY; SEARCH AB New results from the CDF Collaboration on the invariant mass distribution of dijet events observed at the Fermilab Tevatron are used to constrain the masses and couplings of new gauge bosons (W' and Z') as well as fundamental diquarks which can occur in some extended electroweak models. In the case of new gauge bosons, these new bounds are then compared to existing limits which arise from searches for the leptonic decay modes of these particles at the Tevatron. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 45 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 4470 EP 4473 DI 10.1103/PhysRevD.48.4470 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000061 ER PT J AU SCHLUMPF, F AF SCHLUMPF, F TI MAGNETIC-MOMENTS OF THE BARYON DECUPLET IN A RELATIVISTIC QUARK-MODEL SO PHYSICAL REVIEW D LA English DT Note ID PROTON BREMSSTRAHLUNG AB The magnetic moments of the baryon decuplet are calculated in a relativistic constituent quark model using the light front formalism. Of particular interest are the magnetic moments of the OMEGA- and DELTA++ for which new recent experimental measurements are available. Our calculation for the magnetic moment ratios mu(DELTA++)/mu(p) and mu(OMEGA-)/mu(LAMBDA0) is in excellent agreement with the experimental ratios. RP SCHLUMPF, F (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 14 TC 59 Z9 59 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP 4478 EP 4480 DI 10.1103/PhysRevD.48.4478 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000063 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A 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 BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, S PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A 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 BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, S PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI SEARCH FOR 1ST-GENERATION LEPTOQUARKS IN (P)OVER-BAR-P COLLISIONS AT ROOT-S=1.8TEV SO PHYSICAL REVIEW D LA English DT Note ID SCALAR LEPTOQUARKS; HADRON COLLIDERS; Z0 DECAYS; DETECTOR; QUARK; TEV AB We present results of a search for a first-generation leptoquark S1 in ppBAR collisions at square-root s = 1.8 TeV at the Fermilab Tevatron. Using 4.05 pb-1 of data collected during the 1988-1989 CDF run, we have searched for evidence of S1S1BAR production assuming that each leptoquark decays to an electron+quark pair with a branching ratio beta. Three events with two high energy electrons and two high energy jets were found, but are consistent with Z0 decay. No events were found in the signal region. Assuming a short lived scalar leptoquark with Yukawa coupling strength lambda greater than or similar to 2 x 10(-7), we exclude sigmabeta2 > 55(4.0) pb at 95% C.L. for M(s) = 45(125) GeV/c2. Using a Monte Carlo prediction for sigma(ppBAR --> S1S1 + X), we exclude M(s) < 113(80) GeV/c2 for beta = 100(50)%. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T5,QUEBEC,CANADA. UNIV TORONTO,TORONTO M5S 1A1,ONTARIO,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,INST NAZL FIS NUCL,SEZ PADOVA,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. 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. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RI Kim, Soo-Bong/B-7061-2014; St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052 NR 19 TC 42 Z9 42 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 1 PY 1993 VL 48 IS 9 BP R3939 EP R3944 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000001 ER PT J AU BAYM, G FRIEDMAN, G HUGHES, RJ JACAK, BV AF BAYM, G FRIEDMAN, G HUGHES, RJ JACAK, BV TI PRODUCTION OF MUON-MESON ATOMS IN ULTRARELATIVISTIC HEAVY-ION COLLISIONS SO PHYSICAL REVIEW D LA English DT Note ID PROTON AB Ultrarelativistic heavy-ion collisions should produce hydrogen-atom-like Coulomb bound states of muons and mesons. Such atoms could provide a convenient way to measure the muon momentum distribution. We estimate the production rate of pion-muon atoms expected from heavy-ion colliders. C1 UNIV ILLINOIS,LOOMIS LAB PHYS,URBANA,IL 61801. RP BAYM, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1993 VL 48 IS 9 BP R3957 EP R3959 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA ME990 UT WOS:A1993ME99000005 ER PT J AU CHRISTENSEN, K OLAMI, Z AF CHRISTENSEN, K OLAMI, Z TI SANDPILE MODELS WITH AND WITHOUT AN UNDERLYING SPATIAL STRUCTURE SO PHYSICAL REVIEW E LA English DT Article ID SELF-ORGANIZED CRITICALITY; SYSTEMS; AVALANCHES; PHYSICS AB We present a simple mean-field model for the sandpile model introduced by Bak, Tang, and Wiesenfeld (BTW) [Phys. Rev. Lett. 59, 381 (1987)]. In the mean-field model we are able to pinpoint the process of self-organization as well as the emerging scale invariance displayed as a power-law distribution of avalanche sizes. We discuss the BTW sandpile model on a lattice and show that the dynamical behavior can be expressed as a transport problem. This implies that the average avalanche size scales with the system size, and additional heuristic arguments related to the transport properties more than indicate the origin of the power-law behavior. We review recent work in which scaling relations and additional constraints between the various critical exponents are addressed. We demonstrate that some of the proposed relations are inconsistent. We present a coherent ''theory'' in which the scaling relations along with additional constraints leave only one exponent unknown. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP UNIV OSLO, DEPT PHYS, POB 1048, N-0316 OSLO 3, NORWAY. NR 34 TC 88 Z9 89 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1993 VL 48 IS 5 BP 3361 EP 3372 DI 10.1103/PhysRevE.48.3361 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200027 ER PT J AU MENG, B WEINBERG, WH EVANS, JW AF MENG, B WEINBERG, WH EVANS, JW TI TRANSITIONS IN THE KINETICS AND STEADY-STATES OF IRREVERSIBLE A+BC SURFACE-REACTION MODELS SO PHYSICAL REVIEW E LA English DT Article ID DIRECTED-BOND PERCOLATION; MONTE-CARLO SIMULATION; NO-CO REACTION; PHASE-TRANSITIONS; HETEROGENEOUS CATALYSIS; POISONING TRANSITION; HEXAGONAL SURFACES; CRITICAL-BEHAVIOR; NO+CO REACTION; FIELD-THEORY AB The three-component irreversible surface-reaction model A + BC --> AC + 1/2B2 with infinite reaction rates between nearest-neighbor adspecies is studied by Monte Carlo simulations. For a square lattice the system evolves to a degenerate poisoned state exponentially in time, except for a narrow range of pressures in which a reactive quasi-steady-state exists. The latter poisons very slowly in time. For a hexagonal lattice a true reactive steady state occurs for a range of pressures bordered by continuous and discontinuous transitions to poisoned states. The latter behavior is observed by adding the reaction channel A + B --> AB on a square lattice. Some properties of these models are elucidated by analysis of appropriate exact master equations and corresponding pair approximations. Other issues addressed include ''extent of variability'' of the degenerate poisoned states, the effect of finite reaction rates, and spatial correlations. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP MENG, B (reprint author), UNIV CALIF SANTA BARBARA,DEPT CHEM & NUCL ENGN,SANTA BARBARA,CA 93106, USA. NR 34 TC 50 Z9 51 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1993 VL 48 IS 5 BP 3577 EP 3588 DI 10.1103/PhysRevE.48.3577 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200049 ER PT J AU PREISSING, N CAMPOS, DO KUNZE, HJ OSTERHELD, AL WALLING, RS AF PREISSING, N CAMPOS, DO KUNZE, HJ OSTERHELD, AL WALLING, RS TI RELATIVE INTENSITIES OF 3P-3S TRANSITIONS IN NEON-LIKE AR-IX SO PHYSICAL REVIEW E LA English DT Article ID ELECTRON-IMPACT EXCITATION; IONS; SPECTRA AB Argon was added in small amounts to theta-pinch discharges in hydrogen and deuterium, and the relative intensities of all 3p --> 3s transitions of neonlike argon were measured at the peak of the Ar IX concentration. At this time recombination was small since the ion was in an ionizing regime; effective excitation of the 3p levels was essentially due to direct collisional excitation from the ground state and cascading contributions after excitation to higher levels. The relative intensities are compared with theoretical calculations, which employed various collisional and radiative transition rates given in the literature. Very good overall agreement is obtained with a collisional-radiative model which includes all levels up to n = 5. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PREISSING, N (reprint author), RUHR UNIV,INST EXPTL PHYS,44780 BOCHUM,GERMANY. NR 17 TC 5 Z9 6 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 NOV PY 1993 VL 48 IS 5 BP 3867 EP 3870 DI 10.1103/PhysRevE.48.3867 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200077 ER PT J AU COOPER, F SHEPARD, H SODANO, P AF COOPER, F SHEPARD, H SODANO, P TI SOLITARY WAVES IN A CLASS OF GENERALIZED KORTEWEG-DEVRIES EQUATIONS SO PHYSICAL REVIEW E LA English DT Article AB We study the class of generalized Korteweg-de Vries equations derivable from the Lagrangian L(l,p) = integral [1/2phixphit - (phix)l/l(l - 1) + alpha(phixx)2] dx, where the usual fields u(x, t) of the generalized KdV equation are defined by u(x, t) = phix(x, t). This class contains compactons, which are solitary waves with compact support, and when l = p + 2, these solutions have the feature that their width is independent of the amplitude. We consider the Hamiltonian structure and integrability properties of this class of KdV equations. We show that many of the properties of the solitary waves and compactons are easily obtained using a variational method based on the principle of least action. Using a class of trial variational functions of the form u(x, t) = A(t) exp [-beta(t) \x - q(t)\2n] We find solitonlike solutions for all n, moving with fixed shape and constant velocity c. We show that the velocity, mass, and energy of the variational traveling-wave solutions are related by c = 2rEM-1, where r = (p + l + 2)/(p + 6 - l), independent of n. C1 UNIV NEW HAMPSHIRE,DEPT PHYS,DURHAM,NH 03824. UNIV PERUGIA,IST NAZL FIS NUCL,DIPARTIMENTO FIS & SEZ,I-06100 PERUGIA,ITALY. RP COOPER, F (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 7 TC 68 Z9 68 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 NOV PY 1993 VL 48 IS 5 BP 4027 EP 4032 DI 10.1103/PhysRevE.48.4027 PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200094 ER PT J AU DIMITS, AM AF DIMITS, AM TI FLUID SIMULATIONS OF TOKAMAK TURBULENCE IN QUASIBALLOONING COORDINATES SO PHYSICAL REVIEW E LA English DT Article ID TRANSPORT; SHEAR; MODES AB A set of coordinates for simulations in toroidal magnetic geometry, called quasiballooning coordinates, is proposed and implemented. Quasiballooning coordinates are straight-field-line coordinates in which one of the coordinate directions is as close as possible to that of the magnetic field consistent with the near-parallel grid lines meshing exactly (without interpolation) as they cross the boundaries of the simulation region. This allows the true periodicity conditions in the toroidal-poloidal plane to be satisfied in a straightforward and seamless way, even for sheared magnetic fields. Quasiballooning coordinates are useful in the simulation of instabilities and turbulence of interest in fusion plasmas since the number of grid cells needed to represent structures that are elongated along the magnetic field with a given resolution is greatly reduced compared with toroidal-poloidal or other nontwisting coordinates. For explicit codes, they allow shorter time steps, and it is anticipated that for particle codes, their use will naturally minimize the numerical noise. The key details necessary for the implementation of quasiballooning coordinates, both in finite-difference and pseudospectral fluid codes are presented, and a fluid code has been written. The advantages of quasiballooning coordinates are demonstrated by applying this code to turbulence driven by the v(parallel-to)' instability. RP DIMITS, AM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 19 TC 41 Z9 41 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 NOV PY 1993 VL 48 IS 5 BP 4070 EP 4079 DI 10.1103/PhysRevE.48.4070 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200100 ER PT J AU SNYDER, SC LASSAHN, GD REYNOLDS, LD AF SNYDER, SC LASSAHN, GD REYNOLDS, LD TI DIRECT EVIDENCE OF DEPARTURE FROM LOCAL THERMODYNAMIC-EQUILIBRIUM IN A FREE-BURNING ARC-DISCHARGE PLASMA SO PHYSICAL REVIEW E LA English DT Note ID SCATTERING; LASER AB Radial profiles of gas temperature, electron temperature, and electron density were measured in a free-burning atmospheric-pressure argon arc-discharge plasma using line-shape analysis of scattered laser light. This method yields gas temperature, electron temperature, and electron density directly, with no reliance on the assumption of local thermodynamic equilibrium (LTE). Our results show a significant departure from LTE in the center of the discharge, contrary to expectations. RP SNYDER, SC (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 19 TC 50 Z9 50 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 NOV PY 1993 VL 48 IS 5 BP 4124 EP 4127 DI 10.1103/PhysRevE.48.4124 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200112 ER PT J AU PACZUSKI, M BAK, P AF PACZUSKI, M BAK, P TI THEORY OF THE ONE-DIMENSIONAL FOREST-FIRE MODEL SO PHYSICAL REVIEW E LA English DT Note ID SELF-ORGANIZED CRITICALITY; TURBULENCE AB Turbulent cascade processes are studied in terms of a one-dimensional forest-fire model. A hierarchy. of steady-state equations for the forests and the holes between them is constructed and solved within a mean-field closure scheme. The exact hole distribution function is found to be N(H)(s) = 4N/[s(s + 1)(s + 2)], where N is the number of forests. RP PACZUSKI, M (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 17 TC 35 Z9 36 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1993 VL 48 IS 5 BP R3214 EP R3216 PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA MJ742 UT WOS:A1993MJ74200001 ER PT J AU NIETO, MM TRUAX, DR AF NIETO, MM TRUAX, DR TI SQUEEZED STATES FOR GENERAL SYSTEMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID COHERENT STATES; OSCILLATOR; POTENTIALS AB We propose a ladder-operator method for obtaining the squeezed states of general symmetry systems. It is a generalization of the annihilation-operator technique for obtaining the coherent states of symmetry systems. We connect this method with the minimum-uncertainty method for obtaining the squeezed and coherent states of general potential systems, and comment on the distinctions between these two methods and the displacement-operator method. C1 UNIV CALGARY,DEPT CHEM,CALGARY T2N 1N4,ALBERTA,CANADA. RP NIETO, MM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 33 TC 89 Z9 89 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 1 PY 1993 VL 71 IS 18 BP 2843 EP 2846 DI 10.1103/PhysRevLett.71.2843 PG 4 WC Physics, Multidisciplinary SC Physics GA MD948 UT WOS:A1993MD94800001 ER PT J AU MIKAELIAN, KO AF MIKAELIAN, KO TI GROWTH-RATE OF THE RICHTMYER-MESHKOV INSTABILITY AT SHOCKED INTERFACES SO PHYSICAL REVIEW LETTERS LA English DT Article ID STABILITY; FLUIDS AB We have found several cases in our numerical simulations where Richtmyer's prescription fails to give the correct growth rate for the Richtmyer-Meshkov instability in the linear regime. Another expression, due to Fraley [Phys. Fluids 29, 376 (1986)], agrees with our simulations. We discuss recent experiments and report two new types of perturbation freeze-out, single-shock and double-interface, which are quite distinct from the previously reported double-shock freeze-out. RP MIKAELIAN, KO (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 34 Z9 34 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 1 PY 1993 VL 71 IS 18 BP 2903 EP 2906 DI 10.1103/PhysRevLett.71.2903 PG 4 WC Physics, Multidisciplinary SC Physics GA MD948 UT WOS:A1993MD94800016 ER PT J AU PHILLIPS, JM ZHANG, QM LARESE, JZ AF PHILLIPS, JM ZHANG, QM LARESE, JZ TI WHY DO VERTICAL STEPS REAPPEAR IN ADSORPTION-ISOTHERMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ARGON FILMS; LAYERING TRANSITIONS; MULTILAYER GROWTH; GRAPHITE; SUBSTRATE; PHASE; AR AB On the basis of an extensive set of vapor pressure isotherm and diffraction measurements and computer simulations, we present a microscopic description of the mechanism responsible for the observations of Youn and Hess, Phys. Rev. Lett. 64, 918 (1990), relating to the (reentrant) layering properties of argon-on-graphite films. In the neighborhood of 67 K (and for films more than one layer thick) a transition region exists where the outermost solid layer becomes liquid by a coverage driven process involving layer promotion. Once formed, the liquid layer can be ''re'' solidified by further increases in argon coverage. This advancing solid-liquid interface results in (re)appearance of vertical steps in the isotherms. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP PHILLIPS, JM (reprint author), UNIV MISSOURI,DEPT PHYS,KANSAS CITY,MO 64110, USA. NR 34 TC 35 Z9 35 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 1 PY 1993 VL 71 IS 18 BP 2971 EP 2974 DI 10.1103/PhysRevLett.71.2971 PG 4 WC Physics, Multidisciplinary SC Physics GA MD948 UT WOS:A1993MD94800033 ER PT J AU SUH, BJ TORGESON, DR BORSA, F AF SUH, BJ TORGESON, DR BORSA, F TI FLUXON THERMAL MOTION DETECTED BY NUCLEAR-SPIN ECHO DECAY MEASUREMENTS - Y-89 NMR IN YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; VORTEX LATTICE; DYNAMICS; PENETRATION; ANISOTROPY AB A new NMR approach was devised to investigate thermal motion of vortices based on the observation of dephasing effects of the transverse nuclear magnetization below T(c). The effect was observed in Y-89 spin-spin relaxation time T2 measurements of YBa2Cu3O7 for two crystal orientations with respect to the applied magnetic field. The data were fitted with a simple model of diffusion of Y-89 nuclei with respect to the local magnetic field gradient generated by the moving vortices. Small values of a thermally activated effective diffusion constant of the vortices' motion well below T(c) with reasonable activation energies were derived. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DIPARTMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. RP SUH, BJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 19 TC 44 Z9 44 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 1 PY 1993 VL 71 IS 18 BP 3011 EP 3014 DI 10.1103/PhysRevLett.71.3011 PG 4 WC Physics, Multidisciplinary SC Physics GA MD948 UT WOS:A1993MD94800043 ER PT J AU YETHIRAJ, M MOOK, HA WIGNALL, GD CUBITT, R FORGAN, EM LEE, SL PAUL, DM ARMSTRONG, T AF YETHIRAJ, M MOOK, HA WIGNALL, GD CUBITT, R FORGAN, EM LEE, SL PAUL, DM ARMSTRONG, T TI ANISOTROPIC VORTEX LATTICE IN YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; SINGLE-CRYSTALS AB We report on small angle neutron scattering observations of the flux line lattice (FLL) in a single crystal of YBa2Cu3O7. To probe the mass anisotropy ratio, m3/m1, measurements were made as a function of angle, THETA, between the 8 kOe applied field and the crystallographic (001) axis for 0-degrees less-than-or-equal-to THETA less-than-or-equal-to 80-degrees. With the rotation about an a/b (or y) axis, two symmetry-related distorted hexagonal FLL domains formed. Contrary to theoretical prediction, the lattices formed are consistent with a rotation of the short basis vector, a1, from the x axis by 15-degrees, after the effects of anisotropy are removed. The mass ratio is 20 +/- 2, which is slightly lower than published values. The temperature dependence of the intensity is not conventional. C1 UNIV BIRMINGHAM,SUPERCONDUCT RES GRP,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. UNIV ZURICH,INST PHYS,CH-8001 ZURICH,SWITZERLAND. ALLIED SIGNAL RES LABS,TORRANCE,CA 90509. UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. RP YETHIRAJ, M (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI cubitt, robert/B-9408-2008; Lee, Stephen/G-9791-2016; OI Lee, Stephen/0000-0002-2020-3310; Wignall, George/0000-0002-3876-3244 NR 10 TC 35 Z9 35 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 1 PY 1993 VL 71 IS 18 BP 3019 EP 3022 DI 10.1103/PhysRevLett.71.3019 PG 4 WC Physics, Multidisciplinary SC Physics GA MD948 UT WOS:A1993MD94800045 ER PT J AU CHEN, YP DENG, YF GLIMM, J LI, G ZHANG, Q SHARP, DH AF CHEN, YP DENG, YF GLIMM, J LI, G ZHANG, Q SHARP, DH TI A RENORMALIZATION-GROUP SCALING ANALYSIS FOR COMPRESSIBLE 2-PHASE FLOW SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; GROUP FIXED-POINT AB Computational solutions to the Rayleigh-Taylor fluid mixing problem, as modeled by the two-fluid two-dimensional Euler equations, are presented. Data from these solutions are analyzed from the point of view of Reynolds averaged equations, using scaling laws derived from a renormalization group analysis. The computations, carried out with the front tracking method on an Intel iPSC/860, are highly resolved and statistical convergence of ensemble averages is achieved. The computations are consistent with the experimentally observed growth rates for nearly incompressible flows. The dynamics of the interior portion of the mixing zone is simplified by the use of scaling variables. The size of the mixing Lone suggests fixed-point behavior. The profile of statistical quantities within the mixing zone exhibit self-similarity under fixed-point scaling to a limited degree. The effect of compressibility is also examined. It is found that, for even moderate compressibility, the growth rates fail to satisfy universal scaling, and moreover, increase significantly with increasing compressibility. The growth rates predicted from a renormalization group fixed-point model are in a reasonable agreement with the results of the exact numerical simulations, even for flows outside of the incompressible limit. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP CHEN, YP (reprint author), SUNY STONY BROOK,DEPT APPL MATH & STAT,STONY BROOK,NY 11794, USA. NR 17 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD NOV PY 1993 VL 5 IS 11 BP 2929 EP 2937 DI 10.1063/1.858701 PG 9 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA MD642 UT WOS:A1993MD64200035 ER PT J AU BIGLARI, H DIAMOND, PH AF BIGLARI, H DIAMOND, PH TI A MEAN-FIELD OHM LAW FOR COLLISIONLESS PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter ID TEARING MODE TURBULENCE; MAGNETIC-FIELD; PINCH AB A mean field Ohm's law valid for collisionless plasmas is derived kinetically. It is shown that contrary to conventional thinking, the resulting hyperresistivity is significantly smaller than its fluid counterpart due to the fact that the turbulent decorrelation rate is linked to the rapid electron ballistic motion rather than the slower nonlinear mixing time. Moreover, the off-diagonal contributions to the parallel electron momentum flux are shown to result in Ohm's law renormalizations that dwarf the current diffusivity and break radial parity symmetry. C1 UNIV CALIF SAN DIEGO,DEPT PHYS 0139,LA JOLLA,CA 92093. RP BIGLARI, H (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 18 TC 7 Z9 7 U1 0 U2 2 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 NOV PY 1993 VL 5 IS 11 BP 3838 EP 3840 DI 10.1063/1.860604 PG 3 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100002 ER PT J AU SHAING, KC AF SHAING, KC TI TEST OF TOKAMAK LOW-MODE HIGH-MODE TRANSITION THEORY IN STELLARATORS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter ID EDGE ELECTRIC-FIELD; L-H TRANSITION; POLOIDAL ROTATION; TOROIDAL PLASMAS; JFT-2M TOKAMAK; PARALLEL AB The tokamak L-H (low-mode-high mode) transition theory can be tested in stellarators in a controlled manner by making use of the two or more local maxima in poloidal viscosity in these devices. Depending on the relative magnitudes of the toroidal and helical components of the magnetic-field spectrum, the local maxima, and thus transition, can occur either at a critical poloidal EXB Mach number M(p) of the order of unity, similar to that of a tokamak, or at an M(p) of the order of \m - nq\/m, similar to that of a helically symmetric torus. Here, E (B) is the electric (magnetic) field strength, m (n) is the poloidal (toroidal) mode number of the helical component of the \B\ spectrum, and q is the safety factor. Possible limitations on the test due to the effects of the charge-exchange momentum loss are discussed. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 17 TC 49 Z9 49 U1 0 U2 6 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 NOV PY 1993 VL 5 IS 11 BP 3841 EP 3843 DI 10.1063/1.860605 PG 3 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100003 ER PT J AU KROMMES, JA HU, GZ AF KROMMES, JA HU, GZ TI GENERAL-THEORY OF ONSAGER SYMMETRIES FOR PERTURBATIONS OF EQUILIBRIUM AND NONEQUILIBRIUM STEADY-STATES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID METRIC GEOMETRY; STATISTICAL DYNAMICS; TRANSPORT-EQUATIONS; TOROIDAL PLASMAS; DETAILED BALANCE; LINEAR-SYSTEMS; OPTIMUM-THEORY; THERMODYNAMICS; TURBULENCE; FLUCTUATIONS AB The theory of Onsager symmetry is reconsidered from the point of view of its application to nonequilibrium, possibly turbulent steady states. A dynamical formalism based on correlation and response functions is used; understanding of its relationship to more conventional approaches based on entropy production enables one to resolve various confusions about the proper use of the theory, even near thermal equilibrium. Previous claims that ''kinematic'' flows must be excluded from considerations of Onsager symmetry are refuted by showing that suitably defined reversible and irreversible parts of the Onsager matrix separately obey the appropriate symmetry; fluctuating hydrodynamics serves as an example. It is shown that Onsager symmetries are preserved under arbitrary covariant changes of variables; the Weinhold metric is used as a fundamental tensor. Covariance is used to render moot the controversy over the proper choice of fluxes and forces in neoclassical plasma transport theory. The fundamental distinction between the fully contravariant Onsager matrix L(ij) and its mixed representation L(j)i is emphasized and used to explain why some previous workers have failed to find Onsager symmetry around turbulent steady states. The generalized Onsager theorem of Dufty and Rubi [Phys. Rev. A 36, 222 (1987)] is reviewed. An explicitly soluble Langevin problem is shown to violate Onsager's original symmetry but to obey the generalized theorem. The physical content of the generalized Onsager symmetry is discussed from the point of view of Nose-Hoover dynamics. A set of extended Graham-Haken potential conditions are derived for Fokker-Planck models and shown to be consistent with the generalized Onsager relations. Finally, for quite general, possibly turbulent steady states it is argued that realizable Markovian statistical closures with underlying Langevin representations must also obey the generalized theorem. In the special case in which all state variables have even parity and there are no external parameters that change sip under time reversal, the steady-state energy balance fully determines the Onsager matrix, which is guaranteed to be symmetric. RP KROMMES, JA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 95 TC 27 Z9 27 U1 1 U2 6 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 NOV PY 1993 VL 5 IS 11 BP 3908 EP 3941 DI 10.1063/1.860614 PG 34 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100012 ER PT J AU TESSAROTTO, M WHITE, RB AF TESSAROTTO, M WHITE, RB TI THEORY OF RUNAWAY COLLISIONAL TRANSPORT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAK PLASMAS AB The purpose of this paper is to formulate the transport problem for a multispecies rotating toroidal magnetoplasma in the so-called runaway regime, which is defined by an appropriate ordering of relevant characteristic frequencies, in particular, the Larmor frequency, the characteristic acceleration frequency due to the applied electric field and the effective collision frequency, all evaluated at some characteristic speed v0. A suitable form of the gyrokinetic equation is obtained to describe the time-dependent, multispecies plasma response to an applied electric field, in toroidal geometry and for a strongly rotating, quiescent, and collisional plasma. Its moment equations are proven to imply the reduction of the energy equation to Joule's law, as well as consequences on the form of Ohm's law and of the Grad-Shafranov equation. To construct an approximate solution of the gyrokinetic equation and to evaluate all relevant fluxes, appearing in the moment equations, a general variational solution method is developed. C1 PRINCETON UNIV, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08544 USA. RP UNIV TRIESTE, DIPARTIMENTO SCI MATEMAT, I-34127 TRIESTE, ITALY. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 14 TC 8 Z9 8 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1993 VL 5 IS 11 BP 3942 EP 3960 DI 10.1063/1.860615 PG 19 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100013 ER PT J AU MAYO, RM HURLBURT, DJ FERNANDEZ, JC AF MAYO, RM HURLBURT, DJ FERNANDEZ, JC TI ION TEMPERATURE PROFILE DECONVOLUTION AND CORRECTIONS TO CONFINEMENT PARAMETERS IN SPHEROMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MESH FLUX CONSERVERS; ENERGY CONFINEMENT; DIFFUSION-COEFFICIENT; S-1 SPHEROMAK; RELAXATION; PLASMA; TIME AB The purpose of this work is to determine ion temperature profiles in spheromaks [Nucl. Fusion 19, 489 (1979)] for the first time. Knowledge of the ion temperature profile is necessary in the correct calculation of plasma confinement parameters. The work herein details the calculation of ion temperature profiles for the Compact Torus Experiment (CTX) [Nucl. Fusion 28, 1555 (1988)] and S-1 [Phys. Rev. Lett. 46, 188 (1981)] spheromaks. Data from single chord Doppler ion temperature measurements in these devices have been analyzed with the aid of a one-dimensional equilibrium charge state transport code. Using electron temperature and density profiles from Thomson scattering, and estimates for transport rates, a most probable position for the emission of line radiation can be determined and correlated with the measured Doppler ion temperature, thus generating an ion temperature profile. From this ion temperature profile determination, plasma confinement parameters for the small solid flux conserver CTX [Phys. Fluids B 2, 1342 (1990)] spheromak can be determined, and confinement parameters for S-1 can be reevaluated, eliminating the previous confinement calculations assumption T(i)(r) = T(e)(r). The CTX device has a calculated volume averaged beta [beta] ranging from 3% to 8% and a volume averaged energy confinement time [tau(E)] between 14 and 35 musec; while the S-1 spheromak has [beta] between 15% and 40% and [tau(E)] ranging from 30 to 70 musec. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MAYO, RM (reprint author), N CAROLINA STATE UNIV,DEPT NUCL ENGN,RALEIGH,NC 27695, USA. RI Fernandez, Juan/H-3268-2011 OI Fernandez, Juan/0000-0002-1438-1815 NR 19 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1993 VL 5 IS 11 BP 4002 EP 4010 DI 10.1063/1.860619 PG 9 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100017 ER PT J AU FU, GY CHENG, CZ WONG, KL AF FU, GY CHENG, CZ WONG, KL TI STABILITY OF THE TOROIDICITY-INDUCED ALFVEN EIGENMODE IN AXISYMMETRICAL TOROIDAL EQUILIBRIA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID FUSION ALPHA-PARTICLES; TOKAMAKS; INSTABILITIES; EXCITATION; PLASMAS; WAVES; DESTABILIZATION; SIMULATIONS; MODES; TFTR AB The stability of toroidicity-induced Alfven eigenmodes (TAE) is investigated in general tokamak equilibria with finite aspect ratio and finite plasma beta. The finite orbit width of the hot particles and the collisional damping of the trapped electrons are included. For the trapped hot particles, the finite orbit width is found to be stabilizing. For the circulating hot particles, the finite orbit width effect is stabilizing for larger values of v(h)/v(A) ( > 1) and destabilizing for smaller values of v(h)/v(A) ( < 1), where vh is the hot particle speed and v(A) is the Alfven speed. The collisional damping of the trapped electrons is found to have a much weaker dependence on the collision frequency than the previous analytic results. The contribution of the curvature term to the trapped electron collisional damping is negligible compared to that of the parallel electric field term for typical parameters. The calculated critical hot particle beta values for the TAE instability are consistent with the experimental measurements. RP FU, GY (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 30 TC 57 Z9 58 U1 1 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 NOV PY 1993 VL 5 IS 11 BP 4040 EP 4050 DI 10.1063/1.860572 PG 11 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100022 ER PT J AU ARTUN, M REYNDERS, JVW TANG, WM AF ARTUN, M REYNDERS, JVW TANG, WM TI INTEGRAL EIGENMODE ANALYSIS OF SHEAR-FLOW EFFECTS ON THE ION TEMPERATURE-GRADIENT MODE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; JFT-2M TOKAMAK; H TRANSITION; DRIVEN MODES; DIII-D; PROFILES; PHYSICS; PLASMAS AB Previous numerical and analytic kinetic studies have investigated the influence of velocity shear on the ion temperature gradient (ITG) mode. These studies relied on a differential approximation to study mode structures with k(perpendicular-to) rho(i) much less than 1. A recently developed gyrokinetic integral code is here used to explore the effects of sheared flows on the ITG mode for arbitrary values of k(perpendicular-to) rho(i) in sheared slab geometry. It is found that both the mode structure and eigenfrequencies predicted by the integral code can differ from the results obtained by the differential approach, even in the k(y)rho(i) much less than 1 limit. Although some trends predicted by the differential approximation are recovered by the integral approach, there are some significant differences. For example, the slight destabilizing effect observed for small values of the perpendicular velocity shear at k(perpendicular-to) rho(i) much less than 1 is amplified when the integral approach is applied. In dealing with the higher radial eigenmodes, which can often exhibit the largest growth rates, it is emphasized that their finer radial structure usually dictates that the integral equation analysis is required. Results from the integral code are presented together with comparisons with results from the differential approach. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ARTUN, M (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 16 TC 7 Z9 7 U1 1 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 NOV PY 1993 VL 5 IS 11 BP 4072 EP 4080 DI 10.1063/1.860575 PG 9 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100026 ER PT J AU SANFORD, TWL WELCH, DR MOCK, RC AF SANFORD, TWL WELCH, DR MOCK, RC TI DYNAMICS OF A 19 MEV, 700 KA, 25 NSEC ELECTRON-BEAM IN A LONG COLLISIONAL GAS CELL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID DIODE; 19-MEV; FLOW AB The 13 TW pulsed electron beam generated by Hermes III [J. J. Ramirez et al, Digest of Technical Papers, 6th IEEE Pulsed Power Conference (IEEE, New York, 1987), pp. 294] is transported 10.8 m in a low-pressure gas with 79 +/- 1.5 +/- [5]% energy transport efficiency. The uncertainties refer to the rms shot-to-shot variation and estimated systematic error, respectively. The high efficiency obtained is accomplished by removing the inward momentum of the beam at injection via an active magnetic lens. The reduced transverse momentum permits self-magnetic field confinement at low pressures with low inductive and collisional loss. The region of efficient transport lies between regions of instability. Consistent with experiment, the analytic and numerical models developed here predict that the m = 1 resistive hose instability degrades transport above 100 Torr and plasma return-current instabilities disrupt the beam below 1 Torr. Within this pressure ''window'' of stable propagation, the models explain the mechanisms responsible for maximum transport. C1 MISSION RES CORP,ALBUQUERQUE,NM 87106. KTECH CORP INC,ALBUQUERQUE,NM 87110. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 33 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1993 VL 5 IS 11 BP 4144 EP 4161 DI 10.1063/1.860584 PG 18 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100035 ER PT J AU KOGAN, S AF KOGAN, S TI DID PRIVILEGE BLUNT SOVIET SCIENTISTS POLITICS SO PHYSICS TODAY LA English DT Letter RP KOGAN, S (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, 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 NOV PY 1993 VL 46 IS 11 BP 112 EP 112 PG 1 WC Physics, Multidisciplinary SC Physics GA MM164 UT WOS:A1993MM16400019 ER PT J AU AVERY, HW SPOTILA, JR CONGDON, JD FISCHER, RU STANDORA, EA AVERY, SB AF AVERY, HW SPOTILA, JR CONGDON, JD FISCHER, RU STANDORA, EA AVERY, SB TI ROLES OF DIET PROTEIN AND TEMPERATURE IN THE GROWTH AND NUTRITIONAL ENERGETICS OF JUVENILE SLIDER TURTLES, TRACHEMYS-SCRIPTA SO PHYSIOLOGICAL ZOOLOGY LA English DT Article ID FRESH-WATER TURTLE; PSEUDEMYS-SCRIPTA; DIGESTIVE EFFICIENCY; FOOD AVAILABILITY; BODY-TEMPERATURE; CARETTA-CARETTA; NUCLEAR-REACTOR; SEA TURTLES; HABITAT USE; ECOLOGY AB We determined the effects of dietary protein and T-a on growth rates, food consumption rates, digestion rates, and digestive efficiencies of juvenile slider turtles (Trachemys scripta). Results from this study provide a clearer understanding of how these environmental factors interact in influencing body sizes and growth rates of individuals in wild slider turtle populations. Changes in plastron length, carapace length, and body mass were significantly greater for T. scripta eating 25% and 40% crude protein diets than for those eating 10% crude protein. Those consuming 10% crude protein showed significant decreases in body mass and plastron length over a 13-wk period. Individuals at T-a's of 15 degrees, 22 degrees, 28 degrees, or 34 degrees C had food ingestion rates (kJ wk(-1)) that increased markedly with an increase in T-a. Increasing dietary crude protein concentration increased turtle ingestion rates and influenced the positive effect of T-a. Increasing dietary crude protein concentration alone did not significantly affect turtle consumption rates bur did significantly influence the positive effect of T-a. Digestive efficiencies were very high (because of the pelleted diet). Those turtles that ate at 15 degrees C had a digestive efficiency of 99.5%, as compared with 98.3% at 22 degrees C, 94.8% at 28 degrees C, and 95.8% at 34 degrees C. Dietary protein concentration did not influence the digestive efficiencies of T. scripta. These data suggest that dietary protein is an important nutritional component to the growth of juvenile slider turtles and that elevated thermal conditions, combined with a high dietary protein availability, may explain the very high growth rates of slider turtles in some wild populations. C1 SUNY COLL BUFFALO,DEPT BIOL,BUFFALO,NY 14222. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 64 TC 70 Z9 72 U1 2 U2 20 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0031-935X J9 PHYSIOL ZOOL JI Physiol. Zool. PD NOV-DEC PY 1993 VL 66 IS 6 BP 902 EP 925 PG 24 WC Physiology; Zoology SC Physiology; Zoology GA ML387 UT WOS:A1993ML38700003 ER PT J AU SECKBACH, J IKAN, R RINGELBERG, D WHITE, D AF SECKBACH, J IKAN, R RINGELBERG, D WHITE, D TI STEROLS AND PHYLOGENY OF THE ACIDOPHILIC HOT-SPRINGS ALGAE CYANIDIUM-CALDARIUM AND GALDIERIA-SULPHURARIA SO PHYTOCHEMISTRY LA English DT Article DE CYANIDIUM-EALDARIUM; GALDIERIA-SULPHURARIA; CYANIDIOPHYCEAE; RHODOPHYTA; RED ALGAE; CYANOBACTERIA; STEROLS; PHYLOGENY; CHEMOTAXONOMY AB The sterols of Cyanidium caldarium and Galdieria sulphuraria were analysed. These unicellular blue-green eukaryotic algae are acido-thermophilic and have a wide global distribution. The following sterols were found: ergosterol, ergost-7-enol, ergosta-7,22-dienol, chondrillasterol and 22-dihydrochondrillasterol. Ergost-7-enol was the predominant compound in cells of both algae grown in air or pure carbon dioxide. In addition 24-methylcholesta-5,7,22E,24 (24') tetraen-3beta-ol was identified for the first time in algal lipids. The phylogenetic aspects of the presence of these sterols are discussed. C1 DEPT ORGAN CHEM,NAT PROD LAB,IL-91904 JERUSALEM,ISRAEL. UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. UNIV TENNESSEE,OAK RIDGE NATL LAB,KNOXVILLE,TN 37932. RP SECKBACH, J (reprint author), HEBREW UNIV JERUSALEM,SCH OVERSEAS STUDENTS,IL-91905 JERUSALEM,ISRAEL. NR 26 TC 8 Z9 8 U1 1 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0031-9422 J9 PHYTOCHEMISTRY JI Phytochemistry PD NOV PY 1993 VL 34 IS 5 BP 1345 EP 1349 DI 10.1016/0031-9422(91)80027-X PG 5 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA MK874 UT WOS:A1993MK87400025 ER PT J AU MOLDWIN, MB SCIME, EE BAME, SJ GOSLING, JT PHILLIPS, JL BALOGH, A AF MOLDWIN, MB SCIME, EE BAME, SJ GOSLING, JT PHILLIPS, JL BALOGH, A TI PLASMA ELECTRON SIGNATURES OF MAGNETIC CONNECTION TO THE JOVIAN BOW SHOCK - ULYSSES OBSERVATIONS SO PLANETARY AND SPACE SCIENCE LA English DT Article ID SOLAR-WIND ELECTRONS; VELOCITY DISTRIBUTIONS; FLUX OBSERVATIONS; UPSTREAM; WAVES; ISEE-3; ACCELERATION; TRANSPORT; FREQUENCY; JUPITER AB Ulysses plasma electron observations of bidirectional and enhanced unidirectional electron heat fluxes within 4500 R(J) (0.8 a.u. or 3 months on either side of closest approach) of Jupiter are presented as evidence for the magnetic connection of the spacecraft to the Jovian bow shock. These bursts of suprathermal electrons (>30 eV) are observed when the interplanetary magnetic field points roughly parallel or anti-parallel to the Jupiter-spacecraft line. Ninety-eight possible connection events were found over the 6 month period centered on the closest approach to Jupiter. The frequency of occurrence peaked with proximity to the bow shock, with most events occurring post-encounter. These are the first observations of backstreaming suprathermal electrons made in the vicinity of the Jovian bow shock. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP MOLDWIN, MB (reprint author), LOS ALAMOS NATL LAB,SST-7,MS D466,LOS ALAMOS,NM 87545, USA. RI Moldwin, Mark/F-8785-2011 OI Moldwin, Mark/0000-0003-0954-1770 NR 36 TC 7 Z9 7 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD NOV-DEC PY 1993 VL 41 IS 11-12 BP 799 EP 810 DI 10.1016/0032-0633(93)90087-I PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NX892 UT WOS:A1993NX89200002 ER PT J AU HAMMOND, CM PHILLIPS, JL BAME, SJ SMITH, EJ MACLENNAN, CG AF HAMMOND, CM PHILLIPS, JL BAME, SJ SMITH, EJ MACLENNAN, CG TI ULYSSES OBSERVATIONS OF THE PLANETARY DEPLETION LAYER AT JUPITER SO PLANETARY AND SPACE SCIENCE LA English DT Article ID SOLAR-WIND PLASMA; SUBSOLAR MAGNETOSHEATH; MAGNETOPAUSE; ENVIRONMENT; FLYBY AB The repeated samplings of the Jovian magnetosheath during the Ulysses encounter with Jupiter provided an opportunity to probe the planetary depletion layer. Of the 10 complete crossings of the Jovian magnetopause, only three contained clear signatures of an overlying depletion layer. All of these occurred on the flanks of the magnetosphere near the dusk terminator; crossings on the dayside were ambiguous or clearly lacked a depletion layer signature. In this paper we present a detailed analysis of the observations by the Ulysses solar wind plasma and magnetometer experiments and discuss conditions favorable and unfavorable for depletion layer observation. C1 JET PROP LAB,PASADENA,CA 91109. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP HAMMOND, CM (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD NOV-DEC PY 1993 VL 41 IS 11-12 BP 857 EP 868 DI 10.1016/0032-0633(93)90093-H PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NX892 UT WOS:A1993NX89200008 ER PT J AU PHILLIPS, JL BAME, SJ BARRACLOUGH, BL MCCOMAS, DJ FORSYTH, RJ CANU, P KELLOGG, PJ AF PHILLIPS, JL BAME, SJ BARRACLOUGH, BL MCCOMAS, DJ FORSYTH, RJ CANU, P KELLOGG, PJ TI ULYSSES PLASMA ELECTRON OBSERVATIONS IN THE JOVIAN MAGNETOSPHERE SO PLANETARY AND SPACE SCIENCE LA English DT Article ID WAVE OBSERVATIONS; JUPITER; ENVIRONMENT; FLYBY; CURRENTS; MISSION; VOYAGER AB The electron analyzer of the solar wind plasma experiment aboard the Ulysses spacecraft measured the plasma properties of the Jovian magnetosphere and surrounding regions during the February 1992 encounter with Jupiter. In addition to sampling a new region of the Jovian magnetosphere, the Ulysses electron measurements were unique in that they included fine directional sampling over nearly 4pi sr in look direction, for electron energies up to 862 eV. In this paper we present an overview of electron bulk parameters and a sampling of distribution shapes for the magnetosphere and adjacent plasma regions. The magnetopause was crossed 10 times, with each crossing characterized by a boundary layer with mixed magnetospheric and magnetosheath-like electron distributions. The spacecraft transited the dayside, prenoon, equatorial magnetosphere inbound, and the near-terminator, dusk magnetosphere at mid-latitudes outbound. The middle and inner magnetosphere contained a distinct plasma sheet, well-ordered in magnetic latitude, while the outer magnetosphere was less cleanly structured. Field-aligned electron anisotropies were observed throughout the magnetosphere. Unique electron spectra were seen in probable open-field line regions at the highest sampled magnetic latitudes in the inner magnetosphere. Azimuthal flow velocities indicated significant departures from rigid corotation, perhaps representing a combination of corotation and tailward flow. Radial plasma flows were slightly outward in the prenoon plasma sheet and strongly outward throughout the dusk terminator region, but were inward at higher latitudes on the dayside. Strong southward flows were observed in the outer magnetosphere on the dusk side. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. CNET,CTR RECH PHYS ENVIRONM,F-92131 ISSY MOULINEAUX,FRANCE. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. RP PHILLIPS, JL (reprint author), LOS ALAMOS NATL LAB,MAIL STOP D466,LOS ALAMOS,NM 87545, USA. NR 30 TC 38 Z9 38 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD NOV-DEC PY 1993 VL 41 IS 11-12 BP 877 EP 892 DI 10.1016/0032-0633(93)90095-J PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NX892 UT WOS:A1993NX89200010 ER PT J AU SCHULZ, M BLAKE, JB MAZUK, SM BALOGH, A DOUGHERTY, MK FORSYTH, RJ KEPPLER, E PHILLIPS, JL BAME, SJ AF SCHULZ, M BLAKE, JB MAZUK, SM BALOGH, A DOUGHERTY, MK FORSYTH, RJ KEPPLER, E PHILLIPS, JL BAME, SJ TI ENERGETIC PARTICLE, PLASMA AND MAGNETIC-FIELD SIGNATURES OF A POLOIDAL PULSATION IN JUPITER MAGNETOSPHERE SO PLANETARY AND SPACE SCIENCE LA English DT Article ID ULYSSES FLYBY; EPAC AB During its February 1992 inbound journey into Jupiter's magnetosphere, Ulysses made several near-encounters with (and actual traversals of) the Jovian magnetodisk. In at least one such event (investigated here) the anticipated variations in energetic particle fluxes, plasma density, magnetic field intensity, and magnetic field direction at the planetary rotation period were further modulated (strongly and quasi-periodically) at a higher frequency, as if the magnetodisk and magnetic-equatorial surface were ''flapping'' relative to the position of the spacecraft. This additional modulation occurred around 14:00-19:00 U.T. on 7 February (Day 38) 1992, with Ulysses at a nominal (dipolar) magnetic latitude almost-equal-to 11-degrees-22-degrees and at a zenocentric distance r almost-equal-to 18-22R(J). The quasi-period 27pi/omega revealed by autocorrelation analysis of the energetic-proton data (and confirmed by visual examination of plotted data from the various instruments) was about 6.8 ks (almost-equal-to 1.9 h). Oscillations in energetic particle fluxes and plasma density were typically 180-degrees out-of-phase with those in magnetic field intensity. The 6.8 ks period is consistent with oscillation of the magnetic shell of radius r almost-equal-to 21 R(J) at the second poloidal harmonic, which is the mode that would correspond to a ''flapping'' of the magnetodisk and (more generally) of the magnetic-equatorial surface. C1 AEROSP CORP,CTR SPACE & ENVIRONM TECHNOL,EL SEGUNDO,CA 90245. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. MAX PLANCK INST AERON,D-37189 KATLENBURG DUHM,GERMANY. RP SCHULZ, M (reprint author), LOCKHEED PALO ALTO RES LABS,DEPT 91-20,BLDG 255,3251 HANOVER ST,PALO ALTO,CA 94304, USA. NR 22 TC 5 Z9 5 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD NOV-DEC PY 1993 VL 41 IS 11-12 BP 967 EP 975 DI 10.1016/0032-0633(93)90101-7 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NX892 UT WOS:A1993NX89200016 ER PT J AU Vahedi, V DiPeso, G Birdsall, CK Lieberman, MA Rognlien, TD AF Vahedi, V. DiPeso, G. Birdsall, C. K. Lieberman, M. A. Rognlien, T. D. TI Capacitive RF discharges modelled by particle-in-cell Monte Carlo simulation. I: analysis of numerical techniques SO PLASMA SOURCES SCIENCE & TECHNOLOGY LA English DT Article AB Particle-in-cell Monte Carlo simulation has become a very effective tool in exploring processing plasmas and in particular capacitive RF discharges. We describe the conventional particle-in-cell (PIC) simulation and its limitations in terms of computational efficiency, review the implicit subcycling methods used to improve computational efficiency for many problems, and analyse conventional and implicit subcycling PIC simulation performances on an RF discharge model. Implementation of the implicit subcycling scheme in our bounded one-dimensional electrostatic code, PDP1, resulted in an order of magnitude reduction in the simulation run time when the accuracy conditions were satisfied. C1 [Vahedi, V.; Birdsall, C. K.; Lieberman, M. A.] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. [DiPeso, G.; Rognlien, T. D.] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Vahedi, V (reprint author), Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. FU USA Department of Energy [W-7405-ENG-48, DE-FG03-90ER54079]; National Science Foundation [ECS-891082]; Office of Naval Research [FD-N00014-90-J-1198] FX This work was performed with support in part from the Lawrence Livermore National Laboratory under USA Department of Energy Contract W-7405-ENG-48. The portion of the work performed at Berkeley was supported by the National Science Foundation under Grant ECS-8910827, USA Department of Energy Contract DE-FG03-90ER54079, and Office of Naval Research Contract FD-N00014-90-J-1198. Discussions with Dr Alex Friedman, Dr Richard Procassini, Dr Ron Cohen and Dr Dennis Hewett of Lawrence Livermore NR 45 TC 107 Z9 112 U1 1 U2 20 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0963-0252 J9 PLASMA SOURCES SCI T JI Plasma Sources Sci. Technol. PD NOV PY 1993 VL 2 IS 4 BP 261 EP 272 DI 10.1088/0963-0252/2/4/006 PG 12 WC Physics, Fluids & Plasmas SC Physics GA V10QA UT WOS:000207477300006 ER PT J AU Vahedi, V Birdsall, CK Lieberman, MA DiPeso, G Rognlien, TD AF Vahedi, V. Birdsall, C. K. Lieberman, M. A. DiPeso, G. Rognlien, T. D. TI Capacitive RF discharges modelled by particle-in-cell Monte Carlo simulation. II: comparisons with laboratory measurements of electron energy distribution functions SO PLASMA SOURCES SCIENCE & TECHNOLOGY LA English DT Article AB Bi-Maxwellian electron energy distribution functions (EEDFS) have been measured experimentally in argon RF discharges at 13.56 MHz by Godyak et al (Plasma Sources Sci. Technol. 1 36 (1992)). The observed EEDFS at low pressures had very-low-energy and high-energy components. We show particle-in-cell Monte-carlo (PIC-MCC) simulations, which produce the same EEDFS. Excellent agreement is obtained between the effective low and high electron temperatures in simulations and those measured in the laboratory. Our simulations, with the Same physical parameters as in the laboratory, obtain the same transition point in the electron heating mode, from stochastically dominated heating at low pressures to ohmically dominated heating at high pressures. C1 [Vahedi, V.; Birdsall, C. K.; Lieberman, M. A.] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. [DiPeso, G.; Rognlien, T. D.] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Vahedi, V (reprint author), Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. FU USA Department of Energy [W-7405-ENG-48, DE-FG03-90ER54079]; National Science Foundation [ECS-8910827]; Office of Naval Research [FD-N00014-90-J-1198] FX This work was performed with support in part from the Lawrence Livermore National Laboratory under USA Department of Energy Contract W-7405-ENG-48. The portion of the work performed at Berkeley was supported by the National Science Foundation under Grant ECS-8910827, USA Department of Energy Contract DE-FG03-90ER54079, and Office of Naval Research Contract FD-N00014-90-J-1198. Discussions with Dr Ron Cohen and Dr John Hiskes of Lawrence Livermore National Laboratories are gratefully acknowledged. NR 22 TC 63 Z9 64 U1 1 U2 15 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0963-0252 J9 PLASMA SOURCES SCI T JI Plasma Sources Sci. Technol. PD NOV PY 1993 VL 2 IS 4 BP 273 EP 278 DI 10.1088/0963-0252/2/4/007 PG 6 WC Physics, Fluids & Plasmas SC Physics GA V10QA UT WOS:000207477300007 ER PT J AU RAGHAVAN, D TORMA, AE AF RAGHAVAN, D TORMA, AE TI DSC AND FTIR CHARACTERIZATION OF BIODEGRADATION OF POLYETHYLENE - REPLY SO POLYMER ENGINEERING AND SCIENCE LA English DT Letter C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB BIOTECHNOL,IDAHO FALLS,ID 83415. RP RAGHAVAN, D (reprint author), UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801, USA. NR 14 TC 0 Z9 0 U1 0 U2 3 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0032-3888 J9 POLYM ENG SCI JI Polym. Eng. Sci. PD NOV PY 1993 VL 33 IS 22 BP 1509 EP 1510 DI 10.1002/pen.760332212 PG 2 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA MJ568 UT WOS:A1993MJ56800011 ER PT J AU BETHEL, CA MURUGESH, D HARRISON, MR MOHANDAS, N RUBIN, EM AF BETHEL, CA MURUGESH, D HARRISON, MR MOHANDAS, N RUBIN, EM TI SELECTIVE ERYTHROID REPLACEMENT IN MURINE BETA-THALASSEMIA USING FETAL HEMATOPOIETIC STEM-CELLS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE ERYTHROPOIESIS; TRANSPLANTATION; HEMOGLOBINOPATHIES ID MICE; DEFORMABILITY; LIVER AB We have explored the application of fetal hematopoietic stem cell (HSC) transplants for cellular replacement in a murine model of beta-thalassemia. Liver-derived HSCs from nonthalassentic syngeneic murine fetal donors were transplanted into nonirradiated neonatal beta-thalassemic recipients. Significant erythrocyte chimerism (9-27%) was demonstrated in the majority of recipients at 1 month and remained stable or increased (up to 55%) during long-term follow-up in almost all cases. Chimeras had improved phenotypes, as evidenced by decreased reticulocyte counts, increased mean erythrocyte deformability, and decreased iron deposits in comparison to controls. To investigate whether the high degree of peripheral blood chimerism was predominantly a feature of erythroid elements or was a general feature of all hematopoietic elements, chimeras were created using donor HSCs ''tagged'' with a DNA transgene. Whereas donor hemoglobin comprised >30% of total hemoglobin, nucleated tagged nonerythroid donor cells comprised <1% of peripheral blood elements. Explanations for the observed selective increase in erythroid chimerism include longer survival of normal donor red cells compared to that of thalassemic red cells and the effective maturation of the donor erythroid elements in the bone marrow in chimeric animals. The latter explanation bears consideration because it is consistent with the process of ineffective erythropoiesis, well documented to occur in thalassemia, in which the majority of thalassemic erythroid cells are destroyed during erythropoiesis prior to release from the bone marrow. Overall, these data demonstrate the potential for significant erythroid chimerism and suggest that fetal HSC transplantation may play a significant role in future treatment. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 74,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT SURG,FETAL TREATMENT PROGRAM,SAN FRANCISCO,CA 94143. FU NHLBI NIH HHS [HL-20985]; NIDDK NIH HHS [DK-26263, DK-32094] NR 22 TC 17 Z9 17 U1 0 U2 1 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 1 PY 1993 VL 90 IS 21 BP 10120 EP 10124 DI 10.1073/pnas.90.21.10120 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MF296 UT WOS:A1993MF29600078 PM 7980734 ER PT J AU CHUNG, HH BENSON, DR CORNISH, VW SCHULTZ, PG AF CHUNG, HH BENSON, DR CORNISH, VW SCHULTZ, PG TI PROBING THE ROLE OF LOOP-2 IN RAS FUNCTION WITH UNNATURAL AMINO-ACIDS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID GENE-PRODUCT; SACCHAROMYCES-CEREVISIAE; GTP HYDROLYSIS; TRIPHOSPHATE CONFORMATION; ACTIVATING PROTEIN; MOLECULAR-CLONING; CATALYTIC DOMAIN; EFFECTOR DOMAIN; BINDING DOMAIN; P21 AB The YDPT sequence motif (residues 32-35) in loop 2 (residues 32-40) of Ha-Ras p21 protein is conserved in the Ras protein family. X-ray crystal structures have revealed significant conformational differences in this region between the GTP- and GDP-bound forms. Moreover, mutations in this region block neoplastic transformation and prevent interaction with GTPase-activating protein (GAP), suggesting that this region may contribute to the effector function of Ras. To better understand the structural features required for GAP interaction and GTPase activity, the expanded repertoire of unnatural amino acid mutagenesis has been used to investigate the roles of the key residues, Pro-34, Thr-35, and Ile-36. A Pro-34 --> methanoproline mutant, in which residue 34 is locked in the trans conformation, was found to retain high levels of intrinsic and GAP-activated GTPase activity, making unlikely conformational isomerization at this position. Deletion of a single methyl group from Ile (Ile-36 --> norvaline) abolished GAP activation of Ras, revealing a remarkable specificity in this protein-protein interaction. Finally, replacement of Thr-35 with diastereomeric allo-threonine led to inactivation of Ras, demonstrating the importance of the orientation of this critical residue in Ras function. C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. FU NIGMS NIH HHS [R01 GM090126, F32 GM14165] NR 43 TC 27 Z9 27 U1 1 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 1 PY 1993 VL 90 IS 21 BP 10145 EP 10149 DI 10.1073/pnas.90.21.10145 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MF296 UT WOS:A1993MF29600083 PM 8234268 ER PT J AU DYKHUIZEN, DE POLIN, DS DUNN, JJ WILSKE, B PREACMURSIC, V DATTWYLER, RJ LUFT, BJ AF DYKHUIZEN, DE POLIN, DS DUNN, JJ WILSKE, B PREACMURSIC, V DATTWYLER, RJ LUFT, BJ TI BORRELIA-BURGDORFERI IS CLONAL - IMPLICATIONS FOR TAXONOMY AND VACCINE DEVELOPMENT SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE GENE TREES; LATERAL GENE TRANSFER; OSPA; P93; FLAGELLAR GENE ID OUTER SURFACE PROTEIN; LYME-DISEASE; SPIROCHETAL ETIOLOGY; GENE; OSPA; RECOMBINATION; HETEROGENEITY; SEQUENCE; FLA AB The chromosomal genes fla and p93 and the ospA gene from a linear plasmid were sequenced from up to 15 isolates of Borrelia burgdorferi, which causes Lyme borreliosis in man. Comparison of the gene trees provides no evidence for genetic exchange between chromosomal genes, suggesting B. burgdorferi is strictly clonal. Comparison of the chromosomal gene trees with that of the plasmid-encoded ospA reveals that plasmid transfer between clones is rare. Evidence for intragenic recombination was found in only a single ospA allele. The analysis reveals three common clones and a number of rare clones that are so highly divergent that vaccines developed against one are unlikely to provide immunity to organisms from others. Consequently, an understanding of the geographic and genetic variability of B. burgdorferi will prove essential for the development of effective vaccines and programs for control. While the major clones might be regarded as different species, the clonal population structure, the geographic localization, and the widespread incidence of Lyme disease suggest that B. burgdorferi should remain the name for the entire array of organisms. C1 SUNY STONY BROOK,HLTH SCI CTR,DEPT ECOL & EVOLUT,STONY BROOK,NY 11794. SUNY STONY BROOK,HLTH SCI CTR,DEPT MED,STONY BROOK,NY 11794. UNIV MUNICH,MAX VON PETTENKOFER INST HYG & MED MIKROBIOL,W-8000 MUNICH 2,GERMANY. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. OI Dattwyler, Raymond/0000-0002-1983-1301; Luft, Benjamin/0000-0001-9008-7004 FU NIAID NIH HHS [R01AI32454]; PHS HHS [U50/CCU206608] NR 41 TC 149 Z9 153 U1 0 U2 0 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 1 PY 1993 VL 90 IS 21 BP 10163 EP 10167 DI 10.1073/pnas.90.21.10163 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MF296 UT WOS:A1993MF29600087 PM 8234271 ER PT J AU DOBSON, JE AF DOBSON, JE TI THE GEOGRAPHIC REVOLUTION - A RETROSPECTIVE ON THE AGE OF AUTOMATED GEOGRAPHY SO PROFESSIONAL GEOGRAPHER LA English DT Note ID LAKE ACIDIFICATION RP DOBSON, JE (reprint author), OAK RIDGE NATL LAB,SENIOR RES STAFF,BOX 2008,OAK RIDGE,TN 37831, USA. RI Namikawa, Laercio/C-5559-2013; Wright, Dawn/A-4518-2011 OI Namikawa, Laercio/0000-0001-7847-1804; Wright, Dawn/0000-0002-2997-7611 NR 37 TC 27 Z9 29 U1 2 U2 3 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0033-0124 J9 PROF GEOGR JI Prof. Geogr. PD NOV PY 1993 VL 45 IS 4 BP 431 EP 439 DI 10.1111/j.0033-0124.1993.00431.x PG 9 WC Geography SC Geography GA MH164 UT WOS:A1993MH16400007 ER PT J AU PELLIN, MJ BURNETT, JW AF PELLIN, MJ BURNETT, JW TI DEPTH OF ORIGIN OF SPUTTERED ATOMS - TECHNICAL REPORT SO PURE AND APPLIED CHEMISTRY LA English DT Article; Proceedings Paper CT 18th International Symposium on Macrocyclic Chemistry CY JUN 27-JUL 02, 1993 CL ENCHEDE, NETHERLANDS SP INT UNION PURE & APPL CHEM, INORGANIC & ORGANIC CHEM, ROYAL DUTCH CHEM SOC, UNIV TWENTE ID SUBSURFACE COMPOSITIONAL MODIFICATIONS; ION-SCATTERING SPECTROSCOPY; MONTE-CARLO SIMULATION; CU-RU CATALYSTS; COMPUTER-SIMULATION; AMORPHOUS TARGETS; MASS-SPECTROSCOPY; SINGLE-CRYSTAL; SURFACE; NI AB Sputtering, the ejection of target material following bombardment by energetic ions, is an extremely important technological process. Sputtering is a particularly important technique for the surface analyst, since it is used for both quantitative analysis of impurity concentrations and determination of depth distributions of impurities. Because of the complexity of sputtering, many of its fundamental parameters are difficult to ascertain. The depth of origin of sputtered atoms is a fundamental parameter of the sputtering process which, until recently, has been the subject of considerable controversy. Fortunately, both experiments and theory have improved greatly in this area, allowing a consensus to be reached on this important parameter. This report describes and evaluates these critical experiments and theories. RP PELLIN, MJ (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 67 TC 9 Z9 9 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0033-4545 J9 PURE APPL CHEM JI Pure Appl. Chem. PD NOV PY 1993 VL 65 IS 11 BP 2361 EP 2372 DI 10.1351/pac199365112361 PG 12 WC Chemistry, Multidisciplinary SC Chemistry GA MN356 UT WOS:A1993MN35600008 ER PT J AU RENEAU, SL AF RENEAU, SL TI MANGANESE ACCUMULATION IN ROCK-VARNISH ON A DESERT PIEDMONT, MOJAVE DESERT, CALIFORNIA, AND APPLICATION TO EVALUATING VARNISH DEVELOPMENT SO QUATERNARY RESEARCH LA English DT Article ID QUATERNARY CLIMATIC CHANGES; ALLUVIAL-FAN SURFACES; CIMA VOLCANIC FIELD; BACTERIA; NEVADA; FUNGI; IRON RP RENEAU, SL (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,MS D462,LOS ALAMOS,NM 87545, USA. NR 34 TC 17 Z9 17 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0033-5894 J9 QUATERNARY RES JI Quat. Res. PD NOV PY 1993 VL 40 IS 3 BP 309 EP 317 DI 10.1006/qres.1993.1084 PG 9 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA MJ015 UT WOS:A1993MJ01500004 ER PT J AU KATAOKA, Y PERRIN, J GRDINA, DJ AF KATAOKA, Y PERRIN, J GRDINA, DJ TI INDUCTION OF HPRT MUTATIONS IN MICE AFTER EXPOSURE TO FISSION-SPECTRUM NEUTRONS OR CO-60 GAMMA-RAYS SO RADIATION RESEARCH LA English DT Note ID PHOSPHORIBOSYL TRANSFERASE LOCUS; RADIOPROTECTOR WR-2721; HUMAN-LYMPHOCYTES; MUTANT FREQUENCY; V79 CELLS; MOUSE; IRRADIATION; QUANTIFY C1 UNIV CHICAGO,MED CTR,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. RP KATAOKA, Y (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. FU NCI NIH HHS [NCI CA-37435] NR 21 TC 5 Z9 6 U1 0 U2 0 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 NOV PY 1993 VL 136 IS 2 BP 289 EP 292 DI 10.2307/3578623 PG 4 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA MJ761 UT WOS:A1993MJ76100017 PM 8248487 ER PT J AU GALE, DC SMITH, RD AF GALE, DC SMITH, RD TI SMALL-VOLUME AND LOW FLOW-RATE ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY OF AQUEOUS SAMPLES SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID ELECTROPHORESIS; POLYPEPTIDES; PRINCIPLES; PROTEINS AB A new electrospray ionization source (emitter) has been developed which allows the effective utilization of very small sample volumes at much lower flow rates than previously demonstrated. A small diameter etched-tip capillary has been incorporated into a pressure-infusion electrospray ionization source. The ability to electrospray aqueous solutions without the use of an ancillary sheath flow is demonstrated with several biopolymers. High signal intensities and stable signals are observed for this source in a comparison with a standard methanol-sheath source. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 12 TC 163 Z9 166 U1 3 U2 17 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0951-4198 J9 RAPID COMMUN MASS SP JI Rapid Commun. Mass Spectrom. PD NOV PY 1993 VL 7 IS 11 BP 1017 EP 1021 DI 10.1002/rcm.1290071111 PG 5 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA MG241 UT WOS:A1993MG24100010 ER PT J AU NICHOLS, WE CUENCA, RH SCHMUGGE, TJ WANG, JR AF NICHOLS, WE CUENCA, RH SCHMUGGE, TJ WANG, JR TI PUSHBROOM MICROWAVE RADIOMETER RESULTS FROM HAPEX-MOBILHY SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID TIME DOMAIN REFLECTOMETRY; SURFACE SOIL-MOISTURE AB The NASA C-130 remote sensing aircraft was in Toulouse, France from 25 May through 4 July 1986, for participation in the HAPEX-MOBILHY program. Spectral and radiometric data were collected by C-130-borne sensors in the visible, infrared, and microwave wavelengths. These data provided information on the spatial and temporal variations Of surface parameters such as vegetation indices, surface temperature, and surface soil moisture. The Pushbroom Microwave Radiometer (PBMR) was used to collect passive microwave brightness temperature data. This four-beam sensor operates at the 21 -cm wavelength, providing cross-track coverage approximately 1.2 times the aircraft altitude, Observed brightness temperatures for the period were high, ranging from above 240 K to about 290 K. Brightness temperature images appeared to correspond well to spatial and temporal soil moisture variation. Previous research has demonstrated that an approximately linear relationship exists between the surface emissivity and surface soil moisture. For these data, however, regression analysis did not indicate a strong linear relationship (r2 = 0. 32 and r2 = 0. 42, respectively) because of the limited range of soil moisture conditions encountered and the small number of ground measurements. When results from wetter soil conditions encountered in another experiment were included, the regression improved dramatically. Based on similar research with the PBMR and an understanding of the ground data collection program, this result was examined to produce recommendations for improvements to future passive microwave research and data collection programs. Examples Of surface soil moisture maps generated with PBMR data are presented which appear to be representative of the actual soil moisture conditions. C1 OREGON STATE UNIV, CORVALLIS, OR 97331 USA. USDA ARS, BELTSVILLE AGR RES CTR, BELTSVILLE, MD 20705 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. RP NICHOLS, WE (reprint author), PACIFIC NW LAB, DEPT GEOSCI, POB 999,MSIN K6-77, RICHLAND, WA 99352 USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD NOV PY 1993 VL 46 IS 2 BP 119 EP 128 DI 10.1016/0034-4257(93)90089-G PG 10 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA MD665 UT WOS:A1993MD66500002 ER PT J AU DENYSENKO, A ALEXANDROU, S WANG, CC BRADLEY, DK DONALDSON, WR HSIANG, TY SOBOLEWSKI, R BELL, PM AF DENYSENKO, A ALEXANDROU, S WANG, CC BRADLEY, DK DONALDSON, WR HSIANG, TY SOBOLEWSKI, R BELL, PM TI PICOSECOND ELECTRICAL CHARACTERIZATION OF X-RAY MICROCHANNEL-PLATE DETECTORS USED IN DIAGNOSING INERTIAL CONFINEMENT FUSION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID TRANSMISSION-LINES; PROPAGATION AB The-picosecond electrical pulse-propagation characteristics of microchannel-plate detectors, used in diagnosing laser-driven inertial-confinement-fusion experiments, were measured with an electro-optic sampling system. We determined propagation velocity and signal distortion of the microchannel-plate microstrip, as well as its characteristic impedance and the substrate relative dielectric permittivity. These parameters are critical for proper calibration of the detectors and serve as a guide for their improved designs. C1 UNIV ROCHESTER,LASER ENERGET LAB,ROCHESTER,NY 14623. POLISH ACAD SCI,INST PHYS,PL-02668 WARSAW,POLAND. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DENYSENKO, A (reprint author), UNIV ROCHESTER,DEPT ELECT ENGN,ROCHESTER,NY 14623, USA. RI Sobolewski, Roman/A-1979-2013 NR 9 TC 5 Z9 5 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD NOV PY 1993 VL 64 IS 11 BP 3285 EP 3288 DI 10.1063/1.1144291 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MG624 UT WOS:A1993MG62400039 ER PT J AU DOSSKEY, MG ADRIANO, DC AF DOSSKEY, MG ADRIANO, DC TI TRACE-ELEMENT TOXICITY IN VA MYCORRHIZAL CUCUMBER GROWN ON WEATHERED COAL FLY-ASH SO SOIL BIOLOGY & BIOCHEMISTRY LA English DT Article ID VESICULAR-ARBUSCULAR MYCORRHIZAE; INFECTION; FUNGI; ECOSYSTEMS; SEEDLINGS; GRASSES; ROOTS AB Mycorrhizal colonization is widely recognized as enhancing plant growth on severely disturbed sites. A greenhouse pot experiment was conducted to determine if inoculation with vesicular-arbuscular mycorrhizal (VAM) fungi will enhance vegetation establishment on abandoned coal fly ash basins. Spores of Glomus intraradices (Schenck and Smith) and Glomus etunicatum (Becker and Gerdemann) were added to weathered precipitator ash (EC = 0.91 dS m-1; pH 5.0) and to a pasteurized soil of the same pH (Grossarenic Paleudult, 92% sand, 1% organic matter). Some soil and ash were left unamended as non-mycorrhizal controls. Cucumber (Cucumis sativus L. cv. Poinsette 76) seeds were sown, watered regularly, and fertilized periodically with macro-nutrient solution. By 8 weeks old, all ash-grown plants exhibited smaller leaves with leaf margin curl and necrosis, and plant biomass was significantly less (0.75x) than soil-grown plants. Based on analysis of 18 elements in plant tissues, toxicity to B, Mn or Zn could have caused growth suppression, confirming trace element problems for plant growth on fly ash. For plants grown on fly ash, G. etunicatum was the only fungus that colonized roots (20% of root length reduced from 67% on soil) and it suppressed plant growth to 0.80x that of uninoculated ash-grown plants. Correspondingly, shoot Zn concentration in G. etunicatum-inoculated plants was 3.5 x higher than in uninoculated plants and at generally toxic levels (273 mg kg-1). Glomus etunicatum had no other significant effects on elemental concentrations. These results indicate that VAM colonization in acid, weathered fly ash suppressed plant growth by facilitating uptake of Zn to toxic levels, and implies a limitation to successful use of VAM for vegetation establishment on abandoned coal fly ash basins. RP DOSSKEY, MG (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 31 TC 16 Z9 17 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-0717 J9 SOIL BIOL BIOCHEM JI Soil Biol. Biochem. PD NOV PY 1993 VL 25 IS 11 BP 1547 EP 1552 DI 10.1016/0038-0717(93)90009-Z PG 6 WC Soil Science SC Agriculture GA ME163 UT WOS:A1993ME16300009 ER PT J AU ZACHARA, JM SMITH, SC MCKINLEY, JP RESCH, CT AF ZACHARA, JM SMITH, SC MCKINLEY, JP RESCH, CT TI CADMIUM SORPTION ON SPECIMEN AND SOIL SMECTITES IN SODIUM AND CALCIUM ELECTROLYTES SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID MAGNESIUM EXCHANGE-REACTIONS; MONTMORILLONITIC SOIL; CLAY-MINERALS; SELECTIVE DISSOLUTION; SOLUBILITY PRODUCT; SURFACE; ADSORPTION; KAOLINITE; SUSPENSIONS; CHARGE AB Although specimen smectities (e.g., SWy-1) are often used as analogues of the exchanger phase in smectitic soils, few comparisons of metal ion sorption on specimen and soil smectites have been made. In this study, the sorption of Cd was measured on SWy-1 and on clay-sized separates from two smectitic subsoils to evaluate the selectivity of specimen and soil-derived smectites for Cd. Sorption was measured in clay suspensions (approximate to 1 mmol(c) L(-1) equivalent charge concentration at pH 6.0) in Na+, Ca2+, and Na+-Ca2+ perchlorate solutions across pH 4.5 to 8.5 and at ionic strengths (I) ranging from 0.005 to 0.1. Ionic strength and electrolyte cation valence strongly influenced Cd sorption by SWy-1 and the soil smectites. Ion exchange dominated Cd sorption at low ionic strength in Na+ electrolyte (I = 0.005-0.014). Increasing Na+ concentrations to I = 0.1 or changing the electrolyte cation to Ca2+ at I = 0.003 to 0.006 suppressed ion exchange. When ion exchange was suppressed, Cd sorption to both specimen and soil smectites showed little dependence on ionic strength and increased with pH. Except at the lowest Na+ concentration (I = 0.005), eon ditional equilibrium constants (K-v) for Cd2+ exchange increased with increases in both ionic strength and pH. These increases were ascribed to Cd complexation reactions to edge sites on the layer silicates whose effects became evident only under conditions that suppressed ion exchange. At pH 6 and I = 0.05-0.01, SWy-1 did not exhibit any preference for Na+, Ca2+, or Cd2+. The smectitic soil separates, in contrast, showed (i) sorption behavior that increased sharply with pH, (ii) preference for Cd in Na+ and Ca2+ electrolytes, and (iii) variation in K-v with ionic strength, pH, and surface coverage. The contrasting sorption behavior of the soil smectites was hypothesized to result from (i) a greater edge surface area, which increased the contribution of oxide-like complexation reactions to Cd sorption, and (ii) the presence of minor associated organic material and Fe oxides that functioned as co-complexants for Cd. RP BATTELLE PACIFIC NW LAB, DEPT GEOSCI, BATTELLE BLVD, POB 999, RICHLAND, WA 99352 USA. NR 44 TC 71 Z9 73 U1 0 U2 9 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 0361-5995 EI 1435-0661 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD NOV-DEC PY 1993 VL 57 IS 6 BP 1491 EP 1501 PG 11 WC Soil Science SC Agriculture GA MR829 UT WOS:A1993MR82900017 ER PT J AU ANDERSON, MA BERTSCH, PM AF ANDERSON, MA BERTSCH, PM TI ELECTROPHORETIC MOBILITY AND PARTICLE-SIZE OF CLAYS USING LASER-DOPPLER VELOCIMETRY PHOTON-CORRELATION SPECTROSCOPY SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Note ID KAOLINITE AB Laser Doppler velocimetry-photon correlation spectroscopy (LDV-PCS) was evaluated for the characterization of clay minerals. Electrophoretic mobility and particle size of pure and mixed suspensions of KGa-2 kaolinite and SWy-1 bentonite were determined as a function of pH, ionic strength, and suspension concentration ratios. Kaolinite mobility changed from significant positive values at low pH to negative values at high pH, consistent with the variable-charge nature of kaolinite. Evidence for a contribution of positive charge originating at bentonite edges at Low pH (<4) was also found. Tonic strength also affected mobility of kaolinite and, at low pH, bentonite. Mixtures of kaolinite and bentonite at low pH yielded mobility distribution spectra intermediate to those of the component clays. The two populations were not resolved, which suggests that the kaolinite and bentonite formed mixed particle associations. Particle-size analyses supported inferences from mobility data that significant particle-particle association occurred under neutral to Low pH and moderate ionic strength conditions. C1 UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, DIV BIOGEOCHEM, AIKEN, SC 29801 USA. RP UNIV CALIF RIVERSIDE, DEPT SOIL & ENVIRONM SCI, RIVERSIDE, CA 92521 USA. NR 15 TC 9 Z9 9 U1 0 U2 1 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 0361-5995 EI 1435-0661 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD NOV-DEC PY 1993 VL 57 IS 6 BP 1641 EP 1643 PG 3 WC Soil Science SC Agriculture GA MR829 UT WOS:A1993MR82900044 ER PT J AU ALONSO, RG MASCARENHAS, A HORNER, GS SINHA, K ZHU, J FRIEDMAN, DJ BERTNESS, KA OLSON, JM AF ALONSO, RG MASCARENHAS, A HORNER, GS SINHA, K ZHU, J FRIEDMAN, DJ BERTNESS, KA OLSON, JM TI EVIDENCE FOR PYROELECTRICITY IN SINGLE VARIANT SPONTANEOUSLY ORDERED GAINP2 SO SOLID STATE COMMUNICATIONS LA English DT Article ID ALLOY SEMICONDUCTORS; TEMPERATURE AB The random alloy GaInP2 exhibits the 43mBAR point group symmetry and thus does not posses a unique polar direction. In contrast, spontaneously ordered GaInP2 exhibits the 3m point group symmetry which can give rise to pyroelectricity along the 3-fold symmetry axis or ordering direction. Due to the similarity between the Ga and In cations, any temperature variation induced polarization is expected to be very small compared with typical pyroelectrics such as hexagonal CdS. Our study yields the first experimental evidence for pyroelectricity in single variant spontaneously ordered GaInP2. The experiments involve low frequency laser heating and pyroelectric current measurement using a lock-in detection technique. RP ALONSO, RG (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 16 TC 13 Z9 13 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD NOV PY 1993 VL 88 IS 5 BP 341 EP 344 DI 10.1016/0038-1098(93)90220-H PG 4 WC Physics, Condensed Matter SC Physics GA MF905 UT WOS:A1993MF90500001 ER PT J AU SHABALOVSKAYA, S BATURIN, A AF SHABALOVSKAYA, S BATURIN, A TI ELECTRON-POSITRON ANNIHILATION IN TI BASED COMPOUNDS WITH B2 (CSCL) STRUCTURE SO SOLID STATE COMMUNICATIONS LA English DT Article ID ALLOYS AB The angle correlations of annihilation radiation (ACAR) in TiMe shape memory intermetallic compounds (where Me stands for Fe, Co, Ni, Pd, Pt, and Au) were investigated. It was established that in the sequence of compounds studied, the ACAR gradually changes from the average of the correlations corresponding to the two pure components toward those close to the pure Ti. Consideration of the conduction electrons as free electron gas allowed us to determine the valence band widths and the numbers of sp electrons. Using positron annihilation we also obtained information concerning the B2 phase stability in the studied compounds. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. TOMSK VV KUIBYSHEV STATE UNIV,VD KUZNETSOV SIBERIAN PHYS TECH INST,TOMSK 634050,RUSSIA. RP SHABALOVSKAYA, S (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 25 TC 2 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD NOV PY 1993 VL 88 IS 7 BP 497 EP 501 DI 10.1016/0038-1098(93)90036-M PG 5 WC Physics, Condensed Matter SC Physics GA MJ321 UT WOS:A1993MJ32100001 ER PT J AU KANG, JS HONG, JH JUNG, SW LEE, YP PARK, JG OLSON, CG YOUN, SJ MIN, BI AF KANG, JS HONG, JH JUNG, SW LEE, YP PARK, JG OLSON, CG YOUN, SJ MIN, BI TI ELECTRONIC-STRUCTURES OF THE HALF-METALLIC HEUSLER ALLOYS - NIMNSB AND PTMNSB SO SOLID STATE COMMUNICATIONS LA English DT Article ID PHOTOIONIZATION CROSS-SECTIONS; PHOTOEMISSION; FERROMAGNETS AB Electronic structures of the Heusler alloys of NiMnSb and PtMnSb, which have been predicted to be half-metallic ferromagnetic, are investigated by using photoemission spectroscopy (PES). The PES spectral weight distributions for the Mn 3d, Ni 3d, and Pt 5d states are extracted experimentally and compared with the angular momentum projected local density of states (PLDOS) from the local density functional band structure calculations. It is found that the Mn 3d character spreads throughout the valence band, and that the Ni 3d and Mn3d states overlap each other throughout the Ni 3d bands, suggesting substantial hybridization between Mn 3d and Ni 3d states. For NiMnSb, a Ni 3d satellite feature is observed about 6 eV below the main valence band, reflecting the correlation effects among the Ni 3d electrons. The comparison of the measured PES spectra to the calculated PLDOS shows substantial discrepancies between experiment and theory for both NiMnSb and PtMnSb. C1 IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. POHANG INST SCI & TECHNOL, DEPT PHYS, POHANG 790600, SOUTH KOREA. UNIV WISCONSIN, SYNCHROTRON RADIA CTR, MADISON, WI USA. RP RES INST IND SCI & TECHNOL, POHANG 790600, SOUTH KOREA. RI Park, Je Geun/K-8571-2013 NR 27 TC 15 Z9 15 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 EI 1879-2766 J9 SOLID STATE COMMUN JI Solid State Commun. PD NOV PY 1993 VL 88 IS 8 BP 653 EP 657 DI 10.1016/0038-1098(93)90070-4 PG 5 WC Physics, Condensed Matter SC Physics GA MK898 UT WOS:A1993MK89800018 ER PT J AU LIM, HB CARNEY, KP EDELSON, MC HOUK, RS BRENNER, IB AF LIM, HB CARNEY, KP EDELSON, MC HOUK, RS BRENNER, IB TI EXTRACTION DISCHARGE SOURCE FOR INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY - SPECTRAL LINEWIDTHS AND INTERFERENCE EFFECTS SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article ID MASS-SPECTROMETRY; INTERNAL STANDARDIZATION; TRACE ANALYSIS; SPECTROSCOPY AB A supplementary electrical discharge is generated by extracting the axial channel of an Ar inductively coupled plasma (ICP) through a circular (0.5 mm diameter) sampling orifice into a small vacuum chamber. Emission is observed from just outside the sampling orifice and from the adjacent region of the plasma upstream of the sampler. The discharge enhances the intensities of several Ca II and Sc II lines but does not broaden the lines or otherwise perturb the line shapes. The sampling orifice does not introduce any additional memory or extend the rinse-out time required to change samples. Sodium concomitant at concentrations up to 1000 mg l-1 suppresses the intensities of analyte lines by 5-30%, depending upon the particular line involved. Sodium at 5000 mg l-1 suppresses either ion lines or neutral atom lines by 40-60%. This suppression effect is more severe than that generally observed under normal operating conditions when observing emission from the ICP alone. The additional suppression is attributed to a change in the spatial distribution of emission induced by the discharge and the gas flow into the sampler. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES LAB,AMES,IA 50011. GEOL SURVEY ISRAEL,IL-95501 JERUSALEM,ISRAEL. NR 27 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 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD NOV PY 1993 VL 48 IS 13 BP 1617 EP 1623 DI 10.1016/0584-8547(93)80147-M PG 7 WC Spectroscopy SC Spectroscopy GA MM090 UT WOS:A1993MM09000005 ER PT J AU COON, SR CALAWAY, WF PELLIN, MJ BURNETT, JW WHITE, JM AF COON, SR CALAWAY, WF PELLIN, MJ BURNETT, JW WHITE, JM TI MOLECULAR PHOTOFRAGMENTATION DURING NONRESONANT MULTIPHOTON IONIZATION OF SPUTTERED SPECIES SO SURFACE AND INTERFACE ANALYSIS LA English DT Note ID ENERGY DISTRIBUTIONS; COPPER CLUSTERS; ION-BOMBARDMENT; SPECTROSCOPY; EMISSION; YIELDS; ATOMS AB To assess the quantitative analytical capabilities of laser post-ionization of sputtered neutrals, the photoionization of sputtered Cu, Al and Ru atoms and clusters was investigated. By measuring velocity distributions using both resonant and non-resonant photoionization of the atoms and one-photon and two-photon ionization of the clusters, photofragmentation of clusters was found to be significant. Atomic velocity distributions measured using nonresonant ionization peaked at the same velocity as the respective dimer distribution, indicating that the majority of the non-resonant atomic ion signal is from photofragmented dimers. The contribution to the dimer ion signal from photofragmentation of the trimer varied with the two-photon laser power density. Domination of the atomic photoion channel by molecule fragmentation appears to be a general phenomenon that must be accounted for in all gas-phase multiphoton non-resonant ionization experiments at easily achievable laser power densities (less than or equal to 10(8) W cm(-2)). To minimize photofragmentation effects, atoms should be ionized resonantly and clusters should be one-photon ionized. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. AMES LAB,AMES,IA 50011. UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 25 TC 13 Z9 13 U1 1 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD NOV PY 1993 VL 20 IS 12 BP 1007 EP 1010 DI 10.1002/sia.740201212 PG 4 WC Chemistry, Physical SC Chemistry GA ML430 UT WOS:A1993ML43000011 ER PT J AU CHAKARIAN, V SHUH, DK YARMOFF, JA HAKANSSON, MC KARLSSON, UO AF CHAKARIAN, V SHUH, DK YARMOFF, JA HAKANSSON, MC KARLSSON, UO TI THE ADSORPTION OF I2 ON SI(111)-7X7 STUDIED BY SOFT-X-RAY PHOTOEMISSION SO SURFACE SCIENCE LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; ETCHING REACTION; FLUORINE; SURFACE; SILICON; CHEMISORPTION; CHLORINE; SPECTROSCOPY; REMOVAL; SITES AB The adsorption Of I2 on Si(111)-7 x 7 at room temperature is studied with soft X-ray photoelectron spectroscopy. I2 adsorbs dissociatively, forming a mixture of SiI, SiI2 and SiI3 moieties, of which SiI dominates. The Fermi level is pinned near mid-gap, moving slightly towards the conduction band as the I coverage increases. The surface work function increases monotonically with I coverage. The I 4d core-level displays a single chemical state, which decreases in binding energy with increasing coverage. Analysis of the Si 2p core-level spectra shows that the adsorption proceeds first by attachment of I to the dangling bonds of the 7 x 7 unit cell and that, at saturation, 1.57 +/- 0.05 ML of I atoms are adsorbed in 1.10 +/- 0.02 ML of SiI(x) groups. These results indicate that substrate Si-Si bonds are broken by reaction with I2. The total I coverage is limited, however, by the availability Of surface dangling bonds that are required to initiate the dissociation Of I2 molecules. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LUND UNIV,INST PHYS,DEPT SYNCHROTRON RADIAT RES,S-22362 LUND,SWEDEN. ROYAL INST TECHNOL,DEPT PHYS,S-10044 STOCKHOLM 70,SWEDEN. RP CHAKARIAN, V (reprint author), UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521, USA. NR 26 TC 36 Z9 36 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 1 PY 1993 VL 296 IS 3 BP 383 EP 392 DI 10.1016/0039-6028(93)90032-F PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA ME333 UT WOS:A1993ME33300012 ER PT J AU WANG, GJ VOLKOW, ND FOWLER, JS WOLF, AP MACGREGOR, RR SHEA, CE SCHLYER, DJ HITZEMANN, RJ AF WANG, GJ VOLKOW, ND FOWLER, JS WOLF, AP MACGREGOR, RR SHEA, CE SCHLYER, DJ HITZEMANN, RJ TI COMPARISON OF 2 PET RADIOLIGANDS FOR IMAGING EXTRASTRIATAL DOPAMINE-RECEPTORS IN THE HUMAN BRAIN SO SYNAPSE LA English DT Note ID CLONING C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY STONY BROOK,DEPT RADIOL,STONY BROOK,NY 11794. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP WANG, GJ (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. FU NINDS NIH HHS [NS 15638] NR 10 TC 17 Z9 17 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-4476 J9 SYNAPSE JI Synapse PD NOV PY 1993 VL 15 IS 3 BP 246 EP 249 DI 10.1002/syn.890150311 PG 4 WC Neurosciences SC Neurosciences & Neurology GA MD758 UT WOS:A1993MD75800010 PM 8278901 ER PT J AU HERZENBERG, CL HOWES, RH AF HERZENBERG, CL HOWES, RH TI WOMEN OF THE MANHATTAN PROJECT SO TECHNOLOGY REVIEW LA English DT Article C1 BALL STATE UNIV,MUNCIE,IN 47306. RP HERZENBERG, CL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU MASS INST TECHNOL PI CAMBRIDGE PA CAMBRIDGE, MA 02139 SN 0040-1692 J9 TECHNOL REV JI Technol. Rev. PD NOV-DEC PY 1993 VL 96 IS 8 BP 32 EP 40 PG 9 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MD835 UT WOS:A1993MD83500017 ER PT J AU CHRISTENSEN, R BLACKWOOD, LG AF CHRISTENSEN, R BLACKWOOD, LG TI TESTS FOR PRECISION AND ACCURACY OF MULTIPLE MEASURING DEVICES SO TECHNOMETRICS LA English DT Article DE ACCURACY; GRUBBSS ESTIMATORS; INTERLABORATORY TESTING; MULTIVARIATE LINEAR MODEL; PRECISION; SIMULTANEOUS TEST ID BONFERRONI PROCEDURE AB We propose a multivariate linear model for analyzing measurement-device data that follow Grubbs's model. The multivariate model generates the well-known regression (multiple correlation) test for equality of device variances. It also yields a new simultaneous test for equality of variances and biases. The multivariate model readily permits testing of interesting sub-hypotheses involving the variances and biases. We examine the power of these tests for one-dimensional hypotheses compare them to tests proposed by Grubbs, and propose generalizations of Grubbs's tests. We also consider extensions of Grubbs's model that allow similar regression and simultaneous tests to be performed. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP CHRISTENSEN, R (reprint author), UNIV NEW MEXICO,DEPT MATH & STAT,ALBUQUERQUE,NM 87131, USA. NR 20 TC 10 Z9 10 U1 0 U2 2 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0040-1706 J9 TECHNOMETRICS JI Technometrics PD NOV PY 1993 VL 35 IS 4 BP 411 EP 420 DI 10.2307/1270274 PG 10 WC Statistics & Probability SC Mathematics GA MD224 UT WOS:A1993MD22400007 ER PT J AU ROSINSKI, ST AF ROSINSKI, ST TI NUCLEAR-REACTOR PRESSURE VESSEL-SPECIFIC FLAW DISTRIBUTION DEVELOPMENT SO THEORETICAL AND APPLIED FRACTURE MECHANICS LA English DT Article AB Vessel integrity predictions performed through fracture mechanics analysis of a pressurized thermal shock event have been shown to be significantly sensitive to the overall flaw distribution input. It has been shown that modern vessel in-ser-vice inspection (ISI) results can be used for development of vessel flaw distribution(s) that are more representative of U.S. vessels. This paper describes the development and application of a methodology to analyze ISI data for the purpose of flaw distribution determination. The resultant methodology considers detection reliability, flaw sizing accuracy and flaw detection threshold in its application. Application of the methodology was then demonstrated using four recently acquired U.S. PWR vessel inspection data sets. Throughout the program, new insight was obtained into several key inspection performance and vessel integrity prediction practice issues that will impact future vessel integrity evaluation. For example, the potential application of a vessel-specific flaw distribution now provides at least one method by which a vessel-specific reference flaw size applicable to pressure-temperature limit curves determination can be estimated. This paper will discuss also the development and application of the methodology and the impact to future vessel integrity analyses. RP ROSINSKI, ST (reprint author), SANDIA NATL LABS,ADV NUCL POWER TECHNOL,6471,ALBUQUERQUE,NM 87185, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8442 J9 THEOR APPL FRACT MEC JI Theor. Appl. Fract. Mech. PD NOV PY 1993 VL 19 IS 2 BP 133 EP 143 DI 10.1016/0167-8442(93)90015-4 PG 11 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA MJ743 UT WOS:A1993MJ74300006 ER PT J AU RENNE, RA SAGARTZ, JW BURGER, GT AF RENNE, RA SAGARTZ, JW BURGER, GT TI INTERSPECIED VARIATIONS IN THE HISTOLOGY OF TOXICOLOGICALLY IMPORTANT AREAS IN THE LARYNGES OF CRL-CD RATS AND SYRIAN GOLDEN-HAMSTERS SO TOXICOLOGIC PATHOLOGY LA English DT Article DE LARYNX; RODENT; INHALATION TOXICOLOGY; ANATOMY AB Specific regions in the rodent larynx exhibit cellular changes in response to inhaled xenobiotics. These regions include the base of the epiglottis, ventral pouch, and medial surfaces of the vocal processes of the arytenoid cartilages. There are interspecies differences among laboratory rodents in the microscopic anatomy of these sensitive areas of the laryngeal mucosa. In CRL:CD strain Sprague-Dawley rats, the mucosa covering the epiglottis differs from that of Syrian golden hamsters. The epithelium covering the base of the epiglottis is relatively thin in rats and is composed of a mixture of cell types, whereas in hamsters it is much thicker and is made up almost entirely of tall ciliated columnar cells. The cartilage supporting the ventral pouch in the larynges of hamsters is much more prominent than in rats and forms a distinct protrusion into the laryngeal lumen at the base of the epiglottis. The purpose of this paper is to describe and illustrate these and other subtle differences in rat and hamster laryngeal anatomy, which may be of toxicologic significance. RP RENNE, RA (reprint author), PACIFIC NW LAB, DEPT TOXICOL, MS K4-10,POB 999, RICHLAND, WA 99352 USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU SOC TOXICOLOGIC PATHOLOGISTS PI LAWRENCE PA 1041 NEW HAMPSHIRE ST PO BOX 368, LAWRENCE, KS 66044 SN 0192-6233 J9 TOXICOL PATHOL JI Toxicol. Pathol. PD NOV-DEC PY 1993 VL 21 IS 6 BP 542 EP 546 PG 5 WC Pathology; Toxicology SC Pathology; Toxicology GA NW995 UT WOS:A1993NW99500004 PM 8052800 ER PT J AU DIXON, KL SMITH, MC THOMAS, DL KNISEL, WG AF DIXON, KL SMITH, MC THOMAS, DL KNISEL, WG TI LEACHING CHARACTERISTICS OF BANDED AND BROADCAST INORGANIC TRACERS SO TRANSACTIONS OF THE ASAE LA English DT Article DE LEACHING; CHEMICALS; TRACERS; DISPERSION; DIFFUSION ID GROUNDWATER AB A field study was conducted on an Ocilla loamy coarse sand to determine the leaching characteristics of banded and broadcast applications of bromide and chloride. Bromide and chloride were applied in two treatments to eight plots absent of any crop. One treatment consisted of banding one tracer while broadcasting the other. For the second treatment, the banded and broadcast chemicals were reversed. Lateral and vertical movement was observed and comparisons were made between banded and broadcast tracer applications. Results indicate soil variability, dispersion, and diffusion negated potential banding effects on the solute plume below the root zone. C1 UNIV GEORGIA,DEPT BIOL & AGR ENGN,ATHENS,GA 30602. UNIV GEORGIA,COASTAL PLAIN EXPT STN,DEPT BIOL & AGR ENGN,TIFTON,GA 31793. RP DIXON, KL (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,ENVIRONM SCI SECT,AIKEN,SC 29808, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC AGRICULTURAL ENGINEERS PI ST JOSEPH PA 2950 NILES RD, ST JOSEPH, MI 49085-9659 SN 0001-2351 J9 T ASAE JI Trans. ASAE PD NOV-DEC PY 1993 VL 36 IS 6 BP 1779 EP 1788 PG 10 WC Agricultural Engineering SC Agriculture GA MV974 UT WOS:A1993MV97400034 ER PT J AU ANDERSON, CW AF ANDERSON, CW TI DNA-DAMAGE AND THE DNA-ACTIVATED PROTEIN-KINASE SO TRENDS IN BIOCHEMICAL SCIENCES LA English DT Review ID RNA POLYMERASE-II; HUMAN KU-AUTOANTIGEN; P53; DOMAIN AB DNA-activated protein kinase (DNA-PK) is a nuclear serine/threonine protein kinase that is activated in vitro by DNA fragments. The cellular targets of DNA-PK are nuclear, DNA-binding, regulatory proteins including Sp1, Fos, Jun, Myc, the tumor suppressor protein p53, and RNA polymerase II. These characteristics suggest a role for DNA-PK in coordinating nuclear processes and as a modulator of checkpoint mechanisms activated by DNA damage. RP BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. NR 32 TC 237 Z9 237 U1 0 U2 3 PU ELSEVIER SCIENCE LONDON PI LONDON PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND SN 0968-0004 J9 TRENDS BIOCHEM SCI JI Trends Biochem.Sci. PD NOV PY 1993 VL 18 IS 11 BP 433 EP 437 DI 10.1016/0968-0004(93)90144-C PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MF826 UT WOS:A1993MF82600014 PM 8291090 ER PT J AU NICHOLS, WE CUENCA, RH AF NICHOLS, WE CUENCA, RH TI EVALUATION OF THE EVAPORATIVE FRACTION FOR PARAMETERIZATION OF THE SURFACE, ENERGY-BALANCE SO WATER RESOURCES RESEARCH LA English DT Article ID HAPEX-MOBILHY DATA; SOIL-MOISTURE; MODEL; CIRCULATION AB The evaporative fraction is a ratio of latent heat flux to the sum of latent and sensible heat fluxes. It has been used to characterize the energy partition over land surfaces and has potential for inferring daily energy balance information based on midday remote sensing measurements. The HAPEX-MOBILHY program SAMER system provided surface energy balance data over a range of agricultural crops and soil types. Data from this large-scale field experiment was analyzed to study the behavior and daylight stability of the evaporative fraction in both ideal and general meteorological conditions. Strong linear relations were found to exist between the midday evaporative fraction and the daylight evaporative fraction. Statistical tests, however, rejected the hypothesis that the two quantities were equal. Relations between the evaporative fraction and surface soil moisture as well as soil moisture over the complete root zone were explored, but no correlation was identified. C1 OREGON STATE UNIV, DEPT BIORESOURCE ENGN, CORVALLIS, OR 97331 USA. RP PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, DEPT GEOSC, POB 999 MSIN K6-77, RICHLAND, WA 99352 USA. NR 33 TC 76 Z9 82 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0043-1397 EI 1944-7973 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1993 VL 29 IS 11 BP 3681 EP 3690 DI 10.1029/93WR01958 PG 10 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA MF770 UT WOS:A1993MF77000008 ER PT J AU FOURAR, M BORIES, S LENORMAND, R PERSOFF, P AF FOURAR, M BORIES, S LENORMAND, R PERSOFF, P TI 2-PHASE FLOW IN SMOOTH AND ROUGH FRACTURES - MEASUREMENT AND CORRELATION BY POROUS-MEDIUM AND PIPE-FLOW MODELS SO WATER RESOURCES RESEARCH LA English DT Article ID PRESSURE; FIELD AB Two-phase (air-water) flow experiments were conducted in horizontal artificial fractures. The fractures were between glass plates that were either smooth or artificially roughened by gluing a layer of glass beads to them. One smooth fracture with an aperture of 1 mm and three rough fractures, one with the two surfaces in contact and two without contact, were studied. For both types of fractures, the flow structures are similar to those observed in two-phase flow in a pipe, with structures (bubbles, fingering bubbles, films, and drops) depending on the gas and liquid flow rates. The pressure gradients measured for different liquid and gas velocities were interpreted by three models. First, using Darcy's law leads to relative permeability curves similar to conventional ones for porous media. However, these curves depend not only on saturation but also on flow rates. This effect is caused by inertial forces which are not included in this approach. Second, the standard approach for two-phase flow in pipes (Lockhart and Martinelli's equation) agrees with experimental results, at least for small pressure gradients. Finally, the best fit was obtained by treating the two phases as one homogeneous phase. All the properties are averaged, and the pressure drop is deduced from an empirical correlation between the two-phase Reynolds number and the friction factor. C1 INST FRANCAIS PETR,F-92506 RUEIL MALMAISON,FRANCE. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP FOURAR, M (reprint author), INST MECAN FLUIDES TOULOUSE,AVE PROFESSEUR CAMILLE SOULA,F-31400 TOULOUSE,FRANCE. NR 22 TC 76 Z9 78 U1 3 U2 20 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1993 VL 29 IS 11 BP 3699 EP 3708 DI 10.1029/93WR01529 PG 10 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA MF770 UT WOS:A1993MF77000010 ER PT J AU TOMPSON, AFB AF TOMPSON, AFB TI NUMERICAL-SIMULATION OF CHEMICAL MIGRATION IN PHYSICALLY AND CHEMICALLY HETEROGENEOUS POROUS-MEDIA SO WATER RESOURCES RESEARCH LA English DT Article ID SOLUTE TRANSPORT; LOCAL EQUILIBRIUM; REACTIVE SOLUTES; SORPTION; AQUIFER; SYSTEMS; SOIL; COEFFICIENTS; MODELS; FLOW AB A series of chemical transport simulations in saturated porous media are conducted to examine the coupled impacts on chemical mobility induced by nonuniform sorption reactions and heterogeneous flow fields. The simulations involve the calculation of fluid flow and chemical migration within highly resolved, three-dimensional cubic regions with synthetically derived material properties. Nonuniformities in subsurface materials are represented as randomly correlated hydraulic conductivity and sorption partition coefficient fields. Transport computations are based upon a random walk particle model, appropriately modified to treat equilibrium sorption reactions. Current experiments focus on four hypothetical constituents, one being inert, and the other three independently obeying linear, Freundlich, and Langmuir partitioning relationships. Results show distinct effects of the nonuniform flow and sorption processes on the overall displacement, dispersion, and partitioning/retardation and the breakthrough behavior of the constituent plumes, as well as on the sharpening fronts and skewed concentration profiles associated with nonlinear partitioning models. RP TOMPSON, AFB (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 37 TC 132 Z9 133 U1 2 U2 14 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1993 VL 29 IS 11 BP 3709 EP 3726 DI 10.1029/93WR01526 PG 18 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA MF770 UT WOS:A1993MF77000011 ER PT J AU ADENEKAN, AE PATZEK, TW PRUESS, K AF ADENEKAN, AE PATZEK, TW PRUESS, K TI MODELING OF MULTIPHASE TRANSPORT OF MULTICOMPONENT ORGANIC CONTAMINANTS AND HEAT IN THE SUBSURFACE - NUMERICAL-MODEL FORMULATION SO WATER RESOURCES RESEARCH LA English DT Article ID NONAQUEOUS PHASE LIQUIDS; POROUS-MEDIA CONTAMINATION; GROUNDWATER CONTAMINATION; IMMISCIBLE FLUIDS; UNSATURATED ZONE; STEAM INJECTION; FLOW; SIMULATION; CLEANUP; TEMPERATURE AB A numerical compositional simulator (Multiphase Multicomponent Nonisothermal Organics Transport Simulator (M2NOTS)) has been developed for modeling transient, three-dimensional, nonisothermal, and multiphase transport of multicomponent organic contaminants in the subsurface. The governing equations include (1) advection of all three phases in response to pressure, capillary, and gravity forces; (2) interphase mass transfer that allows every component to partition into each phase present; (3) diffusion; and (4) transport of sensible and latent heat energy. Two other features distinguish M2 NOTS from other simulators reported in the groundwater literature: (1) the simulator allows for any number of chemical components and every component is allowed to partition into all fluid phases present, and (2) each phase is allowed to completely disappear from, or appear in, any region of the domain during a simulation. These features are required to model realistic field problems involving transport of mixtures of nonaqueous phase liquid contaminants, and to quantify performance of existing and emerging remediation methods such as vacuum extraction and steam injection. C1 LAWRENCE BERKELEY LAB, DEPT EARTH SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. NR 73 TC 46 Z9 48 U1 0 U2 10 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0043-1397 EI 1944-7973 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1993 VL 29 IS 11 BP 3727 EP 3740 DI 10.1029/93WR01957 PG 14 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA MF770 UT WOS:A1993MF77000012 ER PT J AU MAULDON, AD KARASAKI, K MARTEL, SJ LONG, JCS LANDSFELD, M MENSCH, A VOMVORIS, S AF MAULDON, AD KARASAKI, K MARTEL, SJ LONG, JCS LANDSFELD, M MENSCH, A VOMVORIS, S TI AN INVERSE TECHNIQUE FOR DEVELOPING MODELS FOR FLUID-FLOW IN FRACTURE SYSTEMS USING SIMULATED ANNEALING SO WATER RESOURCES RESEARCH LA English DT Article AB One of the characteristics of flow and transport in fractured rock is that the flow may be largely confined to a poorly connected network of fractures. In order to represent this condition, Lawrence Berkeley Laboratory has been developing a new type of fracture hydrology model called an ''equivalent discontinuum'' model. In this model we represent the discontinuous nature of the problem through flow on a partially filled lattice. This is done through a statistical inverse technique called ''simulated annealing.'' The fracture network model is ''annealed'' by continually modifying a base model, or ''template,'' so that with each modification, the model behaves more and more like the observed system. This template is constructed using geological and geophysical data to identify the regions that possibly conduct fluid and the probable orientations of channels that conduct fluid. In order to see how the simulated annealing algorithm works, we have developed a synthetic case. In this case, the geometry of the fracture network is completely known, so that the results of annealing to steady state data can be evaluated absolutely. We also analyze field data from the Migration Experiment at the Grimsel Rock Laboratory in Switzerland. C1 HYDROGEOL NATL COOPERAT DISPOSAL NUCL WASTE,BADEN,SWITZERLAND. RP MAULDON, AD (reprint author), LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720, USA. NR 28 TC 31 Z9 32 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1993 VL 29 IS 11 BP 3775 EP 3789 DI 10.1029/93WR00664 PG 15 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA MF770 UT WOS:A1993MF77000019 ER PT J AU SUN, ZM WICKHAM, G AF SUN, ZM WICKHAM, G TI THE INVERSION OF TRANSIENT REFLECTION DATA TO DETERMINE SOLID GRAIN-STRUCTURE SO WAVE MOTION LA English DT Article ID TIME DOMAIN; SCATTERING; MEDIA AB In this paper we consider the direct and inverse scattering problem for an inhomogeneously oriented linearly elastic anisotropic material. We use the invariant imbedding method to formulate a class of one-dimensional reflection problems for the scalar case of obliquely incident horizontally polarized shear waves travelling in a transversely isotropic solid. Particular attention is given to the case when the material parameters are such that the advancing wavefront suffers total internal reflection. The implications of this phenomenon for the wave splitting formalism are discussed and the results from several example computations are presented. We also show that the field satisfies a certain temporally non-local boundary condition at the transition layer where the energy flow is reversed. This condition suggests an intuitively reasonable approximate relationship between the components of the wave splitting there. C1 UNIV MANCHESTER,DEPT MATH,MANCHESTER M13 9PL,ENGLAND. RP SUN, ZM (reprint author), IOWA STATE UNIV,US DOE,AMES LAB,AMES,IA 50011, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD NOV PY 1993 VL 18 IS 2 BP 143 EP 162 DI 10.1016/0165-2125(93)90045-H PG 20 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA MK515 UT WOS:A1993MK51500003 ER PT J AU ELMER, JW TERUYA, AT OBRIEN, DW AF ELMER, JW TERUYA, AT OBRIEN, DW TI TOMOGRAPHIC IMAGING OF NONCIRCULAR AND IRREGULAR ELECTRON-BEAM CURRENT-DENSITY DISTRIBUTIONS SO WELDING JOURNAL LA English DT Article DE TOMOGRAPHIC IMAGING; ELECTRON BEAM; POWER DENSITY DISTR; CURRENT DENSITY; NONCIRCULAR EB; BEAM SHAPE; COMPUTER TOMOGRAPHY; BEAM ORIENTATION; FILAMENT SHAPE ID PENETRATION AB A computer tomography (CT) diagnostic method is presented for high resolution imaging of the current density distribution in electron beams. This technique measures the electron beam (EB) profile by integrating the current density of the beam a long a thin slit, and CT reconstructs the current density distribution from multiple profiles taken at equally spaced angles around the beam. Computer tomography imaging allows the current density distribution of noncircular and irregular electron beams to be accurately measured in order to characterize the quality of the electron optical system and the quality of the electron beam. In this investigation, sharp focused and defocused multi-kilowatt electron beams, produced by hairpin and ribbon filaments, were examined using CT imaging to illustrate the differences that exist between the current density distributions produced by these different filament shapes. The results of this investigation further showed the influence that beam current and beam focus have on the peak power density and the power density distribution of both hairpin and ribbon filaments. When used for process control and beam diagnostics, CT imaging will assist with the accurate transfer of welding parameters to different machines, improve the understanding of electron-beam/material interactions, and help to generate tailored power density distributions for improved electron beam welding and surface treating of materials. RP ELMER, JW (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV PHYS MET CONDENSED MATTER SCI,LIVERMORE,CA 94550, USA. NR 13 TC 10 Z9 10 U1 0 U2 1 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD NOV PY 1993 VL 72 IS 11 BP S493 EP S505 PG 13 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA MF356 UT WOS:A1993MF35600011 ER PT J AU HILL, JP FENG, Q BIRGENEAU, RJ THURSTON, TR AF HILL, JP FENG, Q BIRGENEAU, RJ THURSTON, TR TI MAGNETIC-X-RAY SCATTERING STUDY OF RANDOM-FIELD EFFECTS IN MN0.75ZN0.25F2 SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID D=3 ISING SYSTEM; CRITICAL-BEHAVIOR; PHASE-TRANSITIONS; CRITICAL EXPONENTS; CRITICAL-DYNAMICS; ORDER-PARAMETER; POROUS-MEDIUM; MODEL; ANTIFERROMAGNETS; METASTABILITY AB We report a detailed synchrotron X-ray scattering study of the magnetic correlations in two samples of Mn0.75Zn0.25F2 as a function of temperature and applied field. The critical behavior of this system is believed to be isomorphic with that of the three-dimensional random field Ising model (RFIM). On cooling in an external magnetic field (FC), the first sample exhibits a transition to long range order (LRO) in the near-surface region, at a field dependent temperature, T(N)(H). In contrast, bulk neutron scattering studies show a long lived metastable domain state forming below a metastability boundary, T(M)(H). The transition temperature T(N)(H), lies below the metastability boundary, T(M)(H). The temperature difference, T(M)(H)-T(N)(H), increases with increasing field and agrees closely with the value deduced from an extrapolation from above T(M)(H) of earlier, equilibrium neutron scattering results on the spin-spin correlation length. On cooling, the order parameter exponent is found to be large, beta=0.30+/-0.05. We speculate that there is an imbalance in the random fields in the neighborhood of linear surface defects (scratches) in this sample, and that the consequent net staggered field initiates a regular random Ising transition. The second sample was cut from the first and underwent a more extensive polishing process, resulting in a smoother surface with a small density of visible defects. Interestingly, it does not attain a LRO state on cooling, but rather it forms a domain state consistent with that observed by neutron diffraction. Both samples may be prepared in a LRO state, either by cooling in zero field and subsequently applying a field (ZFC) or, at high fields, by heating from the XY phase (FHXY). We have studied the evolution of the metastable LRO state in each sample on warming. We find universal behavior in both samples at all fields studied. Specifically there is a power-law-like decay of the order parameter with exponent beta=0.20+/-0.05, and a rounded transition region which may be described by a Gaussian distribution of transition temperatures. The width of this distribution scales as H-2. A scaling plot of all the warming data as a function of the scaling variable (T-T(C)(H))/H-2 is constructed. We label this non-equilibrium pseudo-critical behavior, ''trompe l'oeil critical behaviour.'' Phenomenologically, these results enable us to explain many previous, apparently contradictory, results in the literature. C1 BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP HILL, JP (reprint author), MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. RI Hill, John/F-6549-2011 NR 63 TC 24 Z9 24 U1 0 U2 0 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 NOV PY 1993 VL 92 IS 3 BP 285 EP 305 DI 10.1007/BF01308746 PG 21 WC Physics, Condensed Matter SC Physics GA MC880 UT WOS:A1993MC88000002 ER PT J AU WHITE, AR AF WHITE, AR TI ANALYTIC MULTI-REGGE THEORY AND THE POMERON IN QCD .2. GAUGE-THEORY ANALYSIS SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Review AB The high-energy Regge behavior of gauge theories is studied via the formalism of analytic multi-Regge theory. Perturbative results for spontaneously broken theories are first organized into Reggeon diagrams. Unbroken gauge theories are studied via a Reggeon-diagram infrared analysis of symmetry restoration. Massless fermions play a crucial role and the case of QCD involves the supercritical Pomeron as an essential intermediate stage. An introductory review of the buildup of transverse-momentum diagrams and Reggeon diagrams from leading-log calculations in gauge theories is presented first. It is then shown that the results closely reproduce the general structure for multi-Regge amplitudes derived in Part I of the article, allowing the construction of general Reggeon diagrams for spontaneously broken theories. Next it is argued that, with a transverse-momentum cutoff, unbroken gauge theories can be reached through an infrared limiting process which successively decouples fundamental-representation Higgs fields. The first infrared limit studied is the restoration of SU(2) gauge symmetry. The analysis is dominated by the exponentiation of divergences imposed by Reggeon unitarity and the contribution of massless quarks to Reggeon interactions. Massless quarks also produce ''triangle anomaly'' transverse-momentum divergences which do not exponentiate but instead are absorbed into a Reggeon condensate - which can be viewed as a ''generalized winding-number condensate.'' The result is a Reggeon spectrum consistent with confinement and chiral-symmetry breaking, but there is no Pomeron. The analysis is valid when the gauge coupling does not grow in the infrared region, i.e. when a sufficient number of massless quarks is present. An analogy is drawn between the confinement produced by the Reggeon condensate and that produced by regularization of the fermion sea, in the presence of the anomaly, in the two-dimensional Schwinger model. When the analysis is extended to the case of QCD with the gauge symmetry restored to SU(2), the Reggeon condensate can be identified with the Pomeron condensate of supercritical Pomeron theory. In this case, the condensate converts an SU(2) singlet Reggeized gluon to a Pomeron Regge pole - which becomes an SU(3) singlet when the full gauge symmetry is restored. The condensate disappears as SU(3) symmetry is recovered, and in general this limit gives the critical Pomeron at a particular value of the transverse cutoff. If the maximal number of fermions consistent with asymptotic freedom is present, no transverse-momentum cutoff is required. For SU(N) gauge theory it is argued that, when the theory contains many fermions, there are N - 2 Pomeron Regge poles of alternating signature. This spectrum of Pomeron trajectories is in direct correspondence with the topological properties of transverse flux tubes characterized by the center Z(N) of the gauge group. The corresponding Reggeon-field-theory solution of s-channel unitarity should include a representation of Z(N) in the cutting rules. Finally, the implications of the results for the phenomenological study of the Pomeron as well as for the construction of QCD with a small number of flavors are discussed. Also discussed is the attractive possibility that a flavor doublet of color-sextet quarks could both produce the critical Pomeron in QCD and be responsible for electroweak dynamical-symmetry breaking. RP WHITE, AR (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 0 TC 29 Z9 29 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD OCT 30 PY 1993 VL 8 IS 27 BP 4755 EP 4895 DI 10.1142/S0217751X93001910 PG 141 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA MD478 UT WOS:A1993MD47800001 ER PT J AU DEPOLO, CM PEPPIN, WA JOHNSON, PA AF DEPOLO, CM PEPPIN, WA JOHNSON, PA TI CONTEMPORARY TECTONICS, SEISMICITY, AND POTENTIAL EARTHQUAKE SOURCES IN THE WHITE MOUNTAINS SEISMIC GAP, WEST-CENTRAL NEVADA AND EAST-CENTRAL CALIFORNIA, USA SO TECTONOPHYSICS LA English DT Review ID LONG-VALLEY-CALDERA; GREAT-BASIN BOUNDARY; FOCAL MECHANISMS; RANGE PROVINCE; UNITED-STATES; STRESS; VOLCANISM; SEQUENCE; PATTERNS; DEFORMATION AB The White Mountains seismic gap (WMSG) is a broad area between the 1872 Owens Valley earthquake and the 1932 Cedar Mountain earthquake that has a complicated tectonic setting and seismicity patterns, and is considered to have the potential for a strong or larger-magnitude earthquake in the near future. We take the Sierra Nevada block as the western boundary of the WMSG, the Pancake Range lineament and the southernmost 1932 earthquake ruptures as its approximate northern boundary, a change in structure, tectonic rates and seismicity level as the eastern boundary, and the northernmost 1872 earthquake ruptures as the southern boundary. Seismicity within the WMSG, especially in the southern part, has been at a very high level since 1978. This activity has included six events of magnitude greater than or equal to 6 and their associated aftershocks. In addition many earthquake swarms have occurred throughout the WMSG, some of which are distinctly located at the ends of fault zones or near changes in structural orientation. Focal mechanisms show a predominance of strike-slip solutions for both small and large earthquakes, with NW-trending right-lateral and NE-trending left-lateral solutions for over half of the mechanisms. These are similar to the sense of displacements and orientations of the larger faults in the WMSG. Thus seismic strain is consistent with the faulting pattern in the WMSG and is accommodating contemporary deformation through a conjugate set of strike-slip and normal-oblique-slip faults. Examination and analysis of eighteen of the larger faults in the WMSG leads to the estimation of characteristic earthquakes ranging from magnitude 6.8 to 7.4. Given the size ; of the seismic gap (100 km) and the pronounced change in structure near the middle of the seismic gap, it seems likely that it will require two or more magnitude similar to M 7 + events to ''fill'' the gap. C1 UNIV NEVADA,SEISMOL LAB,RENO,NV 89557. UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA. RP DEPOLO, CM (reprint author), UNIV NEVADA,NEVADA BUR MINES & GEOL,RENO,NV 89557, USA. NR 101 TC 13 Z9 13 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-1951 J9 TECTONOPHYSICS JI Tectonophysics PD OCT 30 PY 1993 VL 225 IS 4 BP 271 EP 299 DI 10.1016/0040-1951(93)90302-Z PG 29 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MF645 UT WOS:A1993MF64500003 ER PT J AU HERNANDEZ, R MILLER, WH AF HERNANDEZ, R MILLER, WH TI SEMICLASSICAL TRANSITION-STATE THEORY - A NEW PERSPECTIVE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID REACTION-RATES; FORMALDEHYDE; PROBABILITIES; SYSTEMS AB The semiclassical transition state theory (SCTST) introduced by Miller, Hernandez, Handy, Jayatilaka and Willetts requires the inversion of an (effectively integrable) Hamiltonian with respect to the action of the reactive coordinate. lt is shown that the inversion may be avoided in computing the thermal rate constant; the resulting expression also provides an appealing link to conventional transition state theory. This reformulation of the SCTST rate is illustrated by application to the bimolecular reaction, H+H-2-->H-2+H, and to the unimolecular dissociation. D2CO-->D2+CO. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP HERNANDEZ, R (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Hernandez, Rigoberto/A-8793-2008 OI Hernandez, Rigoberto/0000-0001-8526-7414 NR 26 TC 94 Z9 94 U1 2 U2 12 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 OCT 29 PY 1993 VL 214 IS 2 BP 129 EP 136 DI 10.1016/0009-2614(93)90071-8 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD614 UT WOS:A1993MD61400001 ER PT J AU CURTISS, LA RAGHAVACHARI, K POPLE, JA AF CURTISS, LA RAGHAVACHARI, K POPLE, JA TI THE ACCURATE DETERMINATION OF ENTHALPIES OF FORMATION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID GAUSSIAN-2 THEORY; ENERGIES AB The importance of the quadratic configuration interaction (QCISD(T)) step in Gaussian-2 (G2) theory is investigated for 125 test cases. The average deviation with experiment increases from 1.21 to 1.91 kcal/mol when this step is not included in G2 theory. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. CARNEGIE MELLON UNIV,DEPT CHEM,PITTSBURGH,PA 15213. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL MAT SCI,ARGONNE,IL 60439, USA. NR 5 TC 27 Z9 27 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 29 PY 1993 VL 214 IS 2 BP 183 EP 185 DI 10.1016/0009-2614(93)90078-F PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD614 UT WOS:A1993MD61400008 ER PT J AU WANG, XQ WANG, CZ ZHANG, BL HO, KM AF WANG, XQ WANG, CZ ZHANG, BL HO, KM TI 1ST-PRINCIPLES STUDY OF C(96) FULLERENE ISOMERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID GROUND-STATE; C-78; C-84; C84; CARBON; C-60; C76 AB Four low-energy cage structures of C96 fullerene isomers have been investigated using a combination of first-principles local-density functional approach and an efficient cage network generating scheme. Our results indicate that a low-symmetry C2 isomer is the ground-state structure, which provides useful information for experimental characterization. A detailed analysis of the structural and electronic properties of these fullerene isomers is also presented. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES LAB,AMES,IA 50011. RP WANG, XQ (reprint author), CLARK ATLANTA UNIV,CTR THEORET STUDIES PHYS SYST,ATLANTA,GA 30314, USA. NR 21 TC 16 Z9 16 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 OCT 29 PY 1993 VL 214 IS 2 BP 193 EP 196 DI 10.1016/0009-2614(93)90080-K PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD614 UT WOS:A1993MD61400010 ER PT J AU LARSEN, RG SHORE, J SCHMIDT-ROHR, K EMSLEY, L LONG, H PINES, A JANICKE, M CHMELKA, BF AF LARSEN, RG SHORE, J SCHMIDT-ROHR, K EMSLEY, L LONG, H PINES, A JANICKE, M CHMELKA, BF TI NMR-STUDY OF XENON DYNAMICS AND ENERGETICS IN NA-A ZEOLITE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; MONTE-CARLO CALCULATIONS; SPECTROSCOPY; CAVITIES; ADSORPTION; FLUIDS; XE AB For xenon atoms adsorbed in Na-A zeolite, electronic interactions cause shifts in NMR frequencies, resulting in a spectrum with discrete peaks from xenon atoms in cages with different xenon occupancies. Using two-dimensional exchange NMR, it is possible to determine the microscopic rates of intercage motion and to relate them to the adsorption and activation energies of the xenon atoms. The dependence of the adsorption energies on xenon cage occupancy reflects the importance of the intercage interactions and is directly related to the cage occupancy distribution. Variable temperature measurements yield an activation energy of about 60 kJ/mol for the transfer of a xenon from one cage to another. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF SANTA BARBARA, DEPT CHEM & NUCL ENGN, SANTA BARBARA, CA 93106 USA. RI Emsley, Lyndon/C-6108-2008; larsen, russell/H-3443-2013 OI Emsley, Lyndon/0000-0003-1360-2572; NR 22 TC 60 Z9 60 U1 1 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 29 PY 1993 VL 214 IS 2 BP 220 EP 226 DI 10.1016/0009-2614(93)90085-F PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD614 UT WOS:A1993MD61400015 ER PT J AU REMMERS, G DOMKE, M PUSCHMANN, A MANDEL, T KAINDL, G HUDSON, E SHIRLEY, DA AF REMMERS, G DOMKE, M PUSCHMANN, A MANDEL, T KAINDL, G HUDSON, E SHIRLEY, DA TI HIGH-RESOLUTION INNER-SHELL PHOTOIONIZATION OF NO SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; PHOTOABSORPTION; MOLECULES; NITROGEN; N2 AB For the open-shell molecule NO, high-resolution photoionization studies of N 1s and O 1s core excitations to antibonding pi* and nonbonding Rydberg orbitals were performed. In each case three vibrationally split 1s2(2)pi* 1s(pi*)2 transitions were observed, caused by the interactions of the pi* electrons, as well as two Rydberg series with 3PI and 1PI character. An unambiguous assignment of all observed resonances is given. A Franck-Condon analysis of some of the observed spectral profiles yields vibrational frequencies and equilibrium internuclear distances of the various core-excited states of NO. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. RP REMMERS, G (reprint author), FREE UNIV BERLIN,INST EXPTL PHYS,ARNIMALLEE 14,D-14195 BERLIN,GERMANY. NR 16 TC 27 Z9 27 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 29 PY 1993 VL 214 IS 2 BP 241 EP 249 DI 10.1016/0009-2614(93)90088-I PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD614 UT WOS:A1993MD61400018 ER PT J AU DUNLOP, JR TULLY, FP AF DUNLOP, JR TULLY, FP TI A KINETIC-STUDY OF OH RADICAL REACTIONS WITH METHANE AND PERDEUTERATED METHANE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter AB We measured absolute rate coefficients for the reactions of the hydroxyl radical with methane (k1) and methane-d4 (k2) using the laser photolysis/laser-induced fluorescence technique. We characterized k1 and k2 over the temperature range 293-800 K at pressures between 400 and 750 Torr of helium. We find excellent agreement between our results and the recent determinations of k1 at lower temperatures by Vaghjiani and Ravishankara. The measured rate coefficients, in the units cm3 Molecule-1 s-1, fit well to the three-parameter expressions k1(T) = 9.65 x 10(-20)T2.58 exp(-1082/T) and k2(T) = 8.70 X 10(-22)T3.23 exp(-1334/T). The kinetic isotope effect for abstraction of the H and D atoms varies from 6.75 at 293 K to 1.96 at 800 K. We compare our results to recently reported calculations by Melissas and Truhlar. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. NR 10 TC 54 Z9 55 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 28 PY 1993 VL 97 IS 43 BP 11148 EP 11150 DI 10.1021/j100145a003 PG 3 WC Chemistry, Physical SC Chemistry GA ME477 UT WOS:A1993ME47700003 ER PT J AU LIU, A SAUER, MC TRIFUNAC, AD AF LIU, A SAUER, MC TRIFUNAC, AD TI MULTIPHOTON PROCESSES IN CYCLOHEXANE AND TRANS-DECALIN AND THE FORMATION OF HIGH-MOBILITY CATIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-SPIN-RESONANCE; ALKANE RADICAL CATIONS; DETECTED MAGNETIC-RESONANCE; PULSE-RADIOLYSIS; PROTON-TRANSFER; LIQUID ALKANES; HYDROCARBON SOLUTIONS; CCL3F MATRICES; LINEAR ALKANES; GEMINATE IONS AB The dependence of the absolute efficiencies of production of free electrons and HM+ (positive ions with anomalously high mobility) on the intensity of 248- and 308-nm laser pulses has been measured for neat cyclohexane and trans-decalin and for solutions containing aromatic compounds. In the neat solvents, the yields of electrons and HM+ have the same intensity dependence; for ionization of these two alkanes, two photons are required at 248 nm and three photons at 308 nm. In solutions containing aromatic solutes, where the major fraction of the light absorption is by the solute, yields of both free electron and HM+ are markedly higher, and at both 248 and 308 nm the intensity dependences indicate two photons are required for ionization but that three photons are required to create HM+. This is consistent with the explanation, based on previously reported product analysis studies from this laboratory, that the aromatic solute is ionized when its excited state, created by the first photon, absorbs a second photon and the radical cation absorbs a third photon, which enables it to react with the solvent, creating HM+. Examination of previously reported results on anthracene in 2-propanol supports a similar explanation for the observed decrease in the quantum yield of the anthracene radical cation with increasing intensity. In the neat solvents the production of HM+ can be ascribed to the reaction of the radical cation of the solvent, produced by simultaneous 2- or 3-photon absorption, with a solvent molecule, which is consistent with a body of results bearing on the fate of alkyl radical cations in radiolysis. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 39 TC 18 Z9 18 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 OCT 28 PY 1993 VL 97 IS 43 BP 11265 EP 11273 DI 10.1021/j100145a025 PG 9 WC Chemistry, Physical SC Chemistry GA ME477 UT WOS:A1993ME47700025 ER PT J AU KILCREASE, DP ABDALLAH, J KEADY, JJ CLARK, REH AF KILCREASE, DP ABDALLAH, J KEADY, JJ CLARK, REH TI ATOMIC CONFIGURATION AVERAGE SIMULATIONS FOR PLASMA SPECTROSCOPY SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter ID TRANSITION-ARRAYS; ALUMINUM; OPACITY; HOT AB Configuration average atomic physics based on Hartree-Fock methods and an unresolved transition array (UTA) simulation theory are combined to provide a computationally efficient approach for calculating the spectral properties of plasmas involving complex ions. The UTA theory gives an overall representation for the many lines associated with a radiative transition from one configuration to another without calculating the fine structure in full detail. All of the atomic quantities required for synthesis of the spectrum are calculated in the same approximation and used to generate the parameters required for representation of each UTA. the populations of the various atomic states, and the oscillator strengths. We use this method to simulate the transmission of x-rays through an aluminium plasma. The results are compared to experiment and to previous detailed fine structure calculations. The present results duplicate all major structural features of the spectrum and represent a significant saving in computational time compared to detailed calculations. RP KILCREASE, DP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. OI Kilcrease, David/0000-0002-2319-5934 NR 16 TC 18 Z9 19 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 OCT 28 PY 1993 VL 26 IS 20 BP L717 EP L723 DI 10.1088/0953-4075/26/20/006 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MF205 UT WOS:A1993MF20500006 ER PT J AU NOVAKOV, T PENNER, JE AF NOVAKOV, T PENNER, JE TI LARGE CONTRIBUTION OF ORGANIC AEROSOLS TO CLOUD-CONDENSATION-NUCLEI CONCENTRATIONS SO NATURE LA English DT Article AB THE albedo and radiative properties of marine stratus clouds are determine largely by the number density of cloud condensation nuclei (CCN) over the oceans. Modelling studies have suggested that most of these nuclei are sulphate aerosols derived from both anthropogenic and natural sources1. Here we present evidence that organic aerosols also play a key role in cloud nucleation. We determine the relative contributions of sulphate and organic aerosols to CCN concentrations at a marine site known to be influenced by anthropogenic emissions, and find that organic aerosols account for the major part of both the total aerosol number concentration and the CCN fraction. Thus, in regions that are affected by anthropogenic pollutants, organic aerosols may play at least as important a role as sulphate aerosols in determining the climate effect of clouds. C1 LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,LIVERMORE,CA 94551. RP NOVAKOV, T (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Penner, Joyce/J-1719-2012 NR 16 TC 504 Z9 515 U1 10 U2 82 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 28 PY 1993 VL 365 IS 6449 BP 823 EP 826 DI 10.1038/365823a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MD951 UT WOS:A1993MD95100045 ER PT J AU SUNG, P BAILLY, V WEBER, C THOMPSON, LH PRAKASH, L PRAKASH, S AF SUNG, P BAILLY, V WEBER, C THOMPSON, LH PRAKASH, L PRAKASH, S TI HUMAN XERODERMA-PIGMENTOSUM GROUP-D GENE ENCODES A DNA HELICASE SO NATURE LA English DT Article AB XERODERMA pigmentosum (XP), a genetically heterogeneous human disease, results from a defect in nucleotide excision repair of ultraviolet-damaged DNA. XP patients are extremely sensitive to sunlight and suffer from a high incidence of skin cancers. Cell fusion studies have identified seven XP complementation groups, A-G1-3. Group D is of particular interest as mutations in this gene can also cause Cockayne's syndrome and trichothiodystrophy4. The XPD gene was initially named ERCC2 (excision repair cross complementing) as it was cloned using human DNA to complement the ultraviolet sensitivity of a rodent cell line5. We have purified the XPD protein to near homogeneity and show that it possesses single-stranded DNA-dependent ATPase and DNA helicase activities. We tested whether XPD can substitute for its yeast counterpart RAD3, which is essential for excision repair and for cell viability6. Expression of the XPD gene in Saccharomyces cerevisiae can complement the lethality defect of a mutation in the RAD3 gene6, suggesting that XPD is an essential gene in humans. C1 UNIV ROCHESTER,DEPT BIOL,ROCHESTER,NY 14627. UNIV ROCHESTER,SCH MED,DEPT BIOPHYS,ROCHESTER,NY 14642. LAWRENCE LIVERMORE NATL LAB,BIOL & TECHNOL RES PROGRAM,LIVERMORE,CA 94550. RI Prakash, Satya/C-6420-2013; Prakash, Louise/C-7891-2012 NR 17 TC 265 Z9 272 U1 0 U2 5 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 28 PY 1993 VL 365 IS 6449 BP 852 EP 855 DI 10.1038/365852a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MD951 UT WOS:A1993MD95100055 PM 8413672 ER PT J AU HOREN, DJ BEENE, JR SATCHLER, GR AF HOREN, DJ BEENE, JR SATCHLER, GR TI A CRITIQUE OF THE IMPLICIT FOLDING PROCEDURE FOR ANALYZING INELASTIC HADRON SCATTERING MEASUREMENTS SO PHYSICS LETTERS B LA English DT Article ID ISOSCALAR TRANSITION RATES; NUCLEON NUCLEUS SCATTERING; ALPHA-SCATTERING; DENSITY DEPENDENCE; PROTON-SCATTERING; MATRIX-ELEMENTS; ISOSPIN; FORCE AB The assumptions underlying the use of the ''implicit folding procedure'' are examined and found to be invalid. We advocate that explicit folding calculations be used instead. RP HOREN, DJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 29 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 28 PY 1993 VL 316 IS 4 BP 463 EP 466 DI 10.1016/0370-2693(93)91028-L PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MD457 UT WOS:A1993MD45700001 ER PT J AU CHENG, BL SCHRAMM, DN TRURAN, JW AF CHENG, BL SCHRAMM, DN TRURAN, JW TI INTERACTION RATES AT HIGH MAGNETIC-FIELD STRENGTHS AND HIGH DEGENERACY SO PHYSICS LETTERS B LA English DT Article AB In this paper, we have derived the the effects of strong magnetic fields B on nucleon and particle reaction rates of astrophysical significance. We have explored the sensitivity to the presence of arbitrary degeneracy and polarization. The possible astrophysical applications-of our results are discussed. C1 UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,CTR ASTROPHYS,BATAVIA,IL 60510. RP CHENG, BL (reprint author), UNIV ILLINOIS,DEPT ASTRON,1002 W GREEN ST,URBANA,IL 61801, USA. NR 28 TC 27 Z9 27 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 OCT 28 PY 1993 VL 316 IS 4 BP 521 EP 527 DI 10.1016/0370-2693(93)91038-O PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MD457 UT WOS:A1993MD45700011 ER PT J AU DUNIETZ, I AF DUNIETZ, I TI CP VIOLATION IN B-]D+(C(C)OVER-BAR) WITHOUT TAGGING SO PHYSICS LETTERS B LA English DT Article ID B-MESON DECAYS; NON-LEPTONIC DECAYS; ANGULAR-CORRELATIONS; SEQUENTIAL DECAYS; BRANCHING RATIOS; 6-QUARK MODEL; P-VIOLATION; V1V2 MODES; ASYMMETRIES; B->VV AB Exclusive modes of bottom-flavored hadrons that are governed by b-->d+ (ccBAR) may show CP violating effects at the few percent level. The effects arise due to the interference between the dominant spectator amplitude governed by V(cb)V(cd)* with amplitudes governed by different CKM (Cabibbo-Kobayashi-Maskawa) combinations. The amplitudes with the different CKM combinations consist of non-leptonic penguins and one-loop electroweak graphs. The contribution of the former is very difficult to assess, while that of the latter can be reliably estimated. Neither tagging nor time-dependence is required to observe the CP violating effects, in contrast to the classic B(d)-->J/psi K(S) asymmetry. Examples are B--->J/psipi-, J/psirho-, J/psia1-, B(s)-->J/psiK*0BAR(-->K-pi+), XI(b)0(=bsu)-->J/psiLAMBDA, OMEGA(b)-(=bss)-->J/psiXI-. The branching ratio for any such exclusive mode is around 5 X 10(-5). CP violation might be seen when a decay process is compared with its CP-conjugated partner. It can show up as a rate asymmetry and in a study of the other decay parameters. RP DUNIETZ, I (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,POB 500,BATAVIA,IL 60510, USA. NR 50 TC 21 Z9 21 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 OCT 28 PY 1993 VL 316 IS 4 BP 561 EP 566 DI 10.1016/0370-2693(93)91044-N PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MD457 UT WOS:A1993MD45700017 ER PT J AU ANDERSEN, E BLAES, R BROM, JM CHERNEY, M DELACRUZ, B FERNANDEZ, C GARABATOS, C GARZON, JA GEIST, WM GREINER, DE GRUHN, CR HAFIDOUNI, M HRUBEC, J JONES, PG JUDD, EG KUIPERS, JPM LADREM, M DEGUEVARA, PL LOVHOIDEN, G MACNAUGHTON, J MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G DELOSHEROS, CP PLO, M PORTH, P POWELL, B RAMIL, A ROHRINGER, H SAKREJDA, I THORSTEINSEN, TF TRAXLER, J VOLTOLINI, C WOZNIAK, K YANEZ, A ZYBERT, R AF ANDERSEN, E BLAES, R BROM, JM CHERNEY, M DELACRUZ, B FERNANDEZ, C GARABATOS, C GARZON, JA GEIST, WM GREINER, DE GRUHN, CR HAFIDOUNI, M HRUBEC, J JONES, PG JUDD, EG KUIPERS, JPM LADREM, M DEGUEVARA, PL LOVHOIDEN, G MACNAUGHTON, J MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G DELOSHEROS, CP PLO, M PORTH, P POWELL, B RAMIL, A ROHRINGER, H SAKREJDA, I THORSTEINSEN, TF TRAXLER, J VOLTOLINI, C WOZNIAK, K YANEZ, A ZYBERT, R TI MULTIPLICITY DEPENDENCE OF STRANGENESS PRODUCTION IN S+PB COLLISIONS AT 200 GEV/C PER NUCLEON SO PHYSICS LETTERS B LA English DT Article ID SULFUR AB Production of LAMBDA, LAMBDABAR, and K(s)0 has been measured for a wide range of event multiplicity in S+Pb reactions at 200 GeV/c per nucleon. The production of LAMBDA is shown to increase with multiplicity faster than expected from a superposition of p+p collisions. The effect is seen for low multiplicity (below 100 negative particles). C1 LAWRENCE BERKELEY LAB,MAILSTOP 50D,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV L PASTEUR,IN2P3,CNRS,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. CIEMAT,DIV FIS PARTICULAS,E-28040 MADRID,SPAIN. UNIV SANTIAGO,DEPT FIS PARTICULAS,E-15706 SANTIAGO,SPAIN. INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST FIZ JADROWEJ,PL-30055 KRAKOW 30,POLAND. CREIGHTON UNIV,DEPT PHYS,OMAHA,NE 68178. UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. RI de la Cruz, Begona/K-7552-2014; Plo Casasus, Maximo/M-1445-2014; Ramil, Alberto/B-4698-2008; OI Plo Casasus, Maximo/0000-0002-2289-918X; Ramil, Alberto/0000-0002-5333-9425; Perez de los Heros, Carlos/0000-0002-2084-5866 NR 21 TC 25 Z9 25 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 OCT 28 PY 1993 VL 316 IS 4 BP 603 EP 607 DI 10.1016/0370-2693(93)91050-W PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MD457 UT WOS:A1993MD45700023 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 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 CHAPKIN, M 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 CROZON, M 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 LASO, MDMD 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 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 FRUHWIRTH, R 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 GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T 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 KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KRUPINSKI, 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 MURYN, B 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 PETROVYKH, L 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 RYBICKI, K 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 SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS 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 TURALA, M 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 ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R FUNCHAL, RZ 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 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 CHAPKIN, M 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 CROZON, M 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 LASO, MDMD 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 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 FRUHWIRTH, R 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 GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T 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 KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KRUPINSKI, 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 MURYN, B 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 PETROVYKH, L 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 RYBICKI, K 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 SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS 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 TURALA, M 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 ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI LIMITS ON THE PRODUCTION OF SCALAR LEPTOQUARKS FROM Z(0) DECAYS AT LEP SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E COLLIDERS; SEARCH; SIGNATURES; PARTICLES; PHYSICS AB A search has been made for pairs and for single production of scalar leptoquarks of the first and second generations using a data sample of 392000 Z0 decays from the DELPHI detector at LEP 1. No signal was found and limits on the leptoquark mass, production cross section and branching ratio were set. A mass limit at 95% confidence level of 45.5 GeV/c2 was obtained for leptoquark pair production. The search for the production of a single leptoquark probed the mass region above this limit and its results exclude first and second generation leptoquarks D0 with masses below 65 GeV/c2 and 73 GeV/c2 respectively, at 95% confidence level, assuming that the D0lq Yukawa coupling alpha(lambda) is equal to the electromagnetic one. An upper limit is also given on the coupling alpha(lambda) as a function of the leptoquark mass m(D0). C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,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,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,IN2P3,CNRS,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,DIV HIGH ENERGY PHYS,INST PHYS FZU,CS-18040 PRAGUE 8,CZECHOSLOVAKIA. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,IN2P3,CNRS,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. 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,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,IN2P3,CNRS,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,IN2P3,CNRS,LPNHE,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 MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CS-18000 PRAGUE 8,CZECHOSLOVAKIA. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. 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 ETUD SACLAY,DSM DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST SUPER SANITA,IST NAZ FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,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,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Hallgren, Allan/A-8963-2013; 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; Zukanovich Funchal, Renata/C-5829-2013; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; 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; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Gomez Cadenas, Juan Jose/L-2003-2014; 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 OI Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Tome, Bernardo/0000-0002-7564-8392; Pimenta, Mario/0000-0002-2590-0908; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; 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; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Sannino, Mario/0000-0001-7700-8383; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; 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; NR 34 TC 40 Z9 40 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 28 PY 1993 VL 316 IS 4 BP 620 EP 630 DI 10.1016/0370-2693(93)91053-P PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MD457 UT WOS:A1993MD45700026 ER PT J AU SMITH, DP GRIFFIN, MT OLMSTEAD, MM MAESTRE, MF FISH, RH AF SMITH, DP GRIFFIN, MT OLMSTEAD, MM MAESTRE, MF FISH, RH TI BIOORGANOMETALLIC CHEMISTRY .4. THE BONDING ROLE OF CARBONYL AND AMINO FUNCTIONALITIES IN THE REACTIONS OF GUANINE NUCLEOBASE DERIVATIVES WITH (ETA(5)-PENTAMETHYLCYCLOPENTADIENYL)RHODIUM COMPLEXES IN METHANOL AND AQUEOUS-SOLUTIONS SO INORGANIC CHEMISTRY LA English DT Note ID METALLOCENE ANTITUMOR AGENTS; PENTAMETHYLCYCLOPENTADIENYL-RHODIUM; COORDINATION CHEMISTRY; IRIDIUM COMPLEXES; MECHANISTIC IMPLICATIONS; CRYSTAL-STRUCTURE; V(ETA-5-C5H5)2CL2; DICHLORIDE C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. NR 24 TC 31 Z9 31 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 OCT 27 PY 1993 VL 32 IS 22 BP 4677 EP 4678 DI 10.1021/ic00074a004 PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA ME779 UT WOS:A1993ME77900004 ER PT J AU YAMAZAKI, S ESPENSON, JH HUSTON, P AF YAMAZAKI, S ESPENSON, JH HUSTON, P TI EQUILIBRIA AND KINETICS OF THE REACTIONS BETWEEN HYDROGEN-PEROXIDE AND METHYLTRIOXORHENIUM IN AQUEOUS PERCHLORIC-ACID SOLUTIONS SO INORGANIC CHEMISTRY LA English DT Article ID MAIN-GROUP ELEMENTS; TRANSITION-METALS; MULTIPLE BONDS; CONDENSATION-REACTIONS; OXIDATION; COMPLEXES AB In aqueous solutions the colorless compounds CH3ReO3 (=MTO) and H2O2 form 1:1 and 1:2 adducts. The latter is yellow, with epsilon360 = 1.1 X 10(3) L mol-1 cm-1. Peroxide binding to MTO shows cooperativity, as shown by the inversion of the usual order of binding constants. The stepwise equilibrium constants are K1 = 7.7 L mol-1 and K2 = 145 L mol-1 at 25-degrees-C. The buildup of product, which occurs on the stopped-flow time scale at 9-680 mM H2O2, is fit by biexponential kinetics. The equilibria and rates are independent of [H3O+] in the range 10(-1)-10(-3) M. The peroxide complexes decompose more rapidly at lower [H3O+], particularly at pH > 3. Possible structures for 1:1 and 1:2 MOT-H2O2 adducts are presented and discussed. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. NR 12 TC 73 Z9 73 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 EI 1520-510X J9 INORG CHEM JI Inorg. Chem. PD OCT 27 PY 1993 VL 32 IS 22 BP 4683 EP 4687 DI 10.1021/ic00074a007 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA ME779 UT WOS:A1993ME77900007 ER PT J AU BRAMMER, L ZHAO, D BULLOCK, RM MCMULLAN, RK AF BRAMMER, L ZHAO, D BULLOCK, RM MCMULLAN, RK TI X-RAY AND NEUTRON-DIFFRACTION STUDIES OF [MOH(ETA-C5ME5)(CO)3] AT 163-K SO INORGANIC CHEMISTRY LA English DT Article ID MOLYBDENUM FORMYL COMPLEXES; M = MO; MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; PENTAMETHYLCYCLOPENTADIENYL MOLYBDENUM; CYCLO-ADDITION; REACTIVITY; BOND; ACETYLIDES; TUNGSTEN AB The structure of [MoH(eta-C5Me5)(CO)3] (1) has been determined by X-ray diffraction at 163(3) K [a = 6.969(2) angstrom, b = 12.651(2) angstrom, c = 7.954(2) angstrom, beta = 103.36(2)-degrees, monoclinic, P2(1)/m (No. 11), Z = 2] and neutron diffraction at 163.0(5) K [a = 6.968(2) angstrom, b = 12.658(3) angstrom, c = 7.953(2) angstrom, beta = 103.34(2)-degrees]. Refinements in space group P2(1)/m against both data sets improved the description of the structure obtained by refinements in P2(1) in this and an earlier study. The structure exhibits orientational disorder in the C5Me5 group, yet relatively accurate geometric parameters have been obtained, with esd's from the neutron diffraction study of 0.007 angstrom for Mo-H, 0.010 angstrom (average) for C-H, and 0.003 angstrom (average) for all other bond lengths. The molecule adopts a ''four-legged piano stool'' geometry with the hydride ligand approximately trans to one of the Cp* ring carbons [Mo-H(1) = 1.789(7) angstrom]. Comparison of the title complex with related d4 CpMo(CO)3L complexes (L = formally anionic, monodentate, eta1 ligand) suggests that the conformation of these complexes is determined primarily by steric interactions between the ligand, L, and the Cp or Cp* ring, rather than by electronic effects of either Cp/Cp* or L. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP BRAMMER, L (reprint author), UNIV MISSOURI,DEPT CHEM,8001 NAT BRIDGE RD,ST LOUIS,MO 63121, USA. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 47 TC 20 Z9 20 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD OCT 27 PY 1993 VL 32 IS 22 BP 4819 EP 4824 DI 10.1021/ic00074a027 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA ME779 UT WOS:A1993ME77900027 ER PT J AU CERF, C LIPPENS, G MUYLDERMANS, S SEGERS, A RAMAKRISHNAN, V WODAK, SJ HALLENGA, K WYNS, L AF CERF, C LIPPENS, G MUYLDERMANS, S SEGERS, A RAMAKRISHNAN, V WODAK, SJ HALLENGA, K WYNS, L TI HOMONUCLEAR AND HETERONUCLEAR 2-DIMENSIONAL NMR-STUDIES OF THE GLOBULAR DOMAIN OF HISTONE-H1 - SEQUENTIAL ASSIGNMENT AND SECONDARY STRUCTURE SO BIOCHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; CHROMATIN; PROTEINS; H-5; TRANSCRIPTION; SPECTROSCOPY; ORGANIZATION; INVOLVEMENT; NUCLEOSOME; SPECTRA AB A recombinant 75 amino acid polypeptide corresponding to the globular domain of the chicken histone H1 (GH1) has been studied by H-1 homonuclear and H-1-N-15 heteronuclear 2D NMR spectroscopy. Sequential assignment of the backbone and beta-proton resonances has enabled us to determine the secondary structure of GH1. It was found to consist of three helical regions (T7-S17, L25-Y37, E40-K56) and probably a beta-hairpin (L59-L73). This structure is similar to the structure of the globular domain of histone H5 (GH5) obtained both by NMR spectroscopy [Zarbock et al. (1986) Proc. Natl. Acad. Sci. U.S.A. 83, 7628-7632; Clore et al. (1987) EMBO J. 6, 1833-1842] and by X-ray crystallography [Ramakrishnan et al.(1993) Nature 362, 219-223]. The beta-hairpin as suggested for GH1 is also present in the X-ray structure of GH5 but has not been reported for the NMR structure of GH5. C1 VRIJE UNIV BRUSSELS,INST OPHTHALMOL,B-1640 RHODE ST GENESE,BELGIUM. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. CORVAS INT NV,UCMB,B-9000 GHENT,BELGIUM. RP CERF, C (reprint author), UNIV LIBRE BRUXELLES,UCMB,CP 160-16,AVE P HEGER,B-1050 BRUSSELS,BELGIUM. RI Muyldermans, Serge/C-6418-2016 OI Muyldermans, Serge/0000-0002-3678-3575 FU NIGMS NIH HHS [GM42796] NR 33 TC 42 Z9 43 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 OCT 26 PY 1993 VL 32 IS 42 BP 11345 EP 11351 DI 10.1021/bi00093a011 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MD710 UT WOS:A1993MD71000011 PM 8218199 ER PT J AU VARMANAIR, M WUNDERLICH, B GREBOWICZ, J BAUER, R AF VARMANAIR, M WUNDERLICH, B GREBOWICZ, J BAUER, R TI THERMAL-BEHAVIOR OF EPOXY-RESINS SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 21st North-American-Thermal-Analysis-Society Conference CY SEP 13-16, 1992 CL ATLANTA, GA SP N AMER THERMAL ANAL SOC ID SOLID LINEAR MACROMOLECULES; HEAT-CAPACITY MEASUREMENTS; VIBRATIONS; CONVERSION; POLYMERS; SCHEME; CV; CP AB A series of epoxy resins has been analyzed by measuring their heat capacities from 140 K up to decomposition using differential scanning calorimetry. The data for the solids were compared to the vibrational heat capacities computed using an approximate vibrational spectrum consisting of skeletal heat capacities (based on a Tarasov analysis) and group vibrations (obtained from IR and Raman data). The heat capacities for the liquid were used to construct an addition scheme for the molecules with similar groups in their repeating unit. The glass transition and the melting transition are discussed by analyzing the fast-cooled and well crystallized samples. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. SHELL DEV CO,WESTHOLLOW RES CTR,HOUSTON,TX 77251. NR 13 TC 0 Z9 0 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD OCT 26 PY 1993 VL 226 BP 99 EP 106 DI 10.1016/0040-6031(93)80210-2 PG 8 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA ML659 UT WOS:A1993ML65900012 ER PT J AU JIN, YM WUNDERLICH, B AF JIN, YM WUNDERLICH, B TI SINGLE-RUN HEAT-CAPACITY MEASUREMENT BY DSC - PRINCIPLE, EXPERIMENTAL AND DATA-ANALYSIS SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 21st North-American-Thermal-Analysis-Society Conference CY SEP 13-16, 1992 CL ATLANTA, GA SP N AMER THERMAL ANAL SOC ID THERMODYNAMIC PROPERTIES; LINEAR MACROMOLECULES; THERMAL-PROPERTIES; POLYMERS AB A single-run heat capacity measurement has been proposed based on standard heat-conduction-type differential scanning calorimetry (DSC) equipment. The experimental tests were in the range 130-560 K. The equipment used was the dual sample DSC and autosampler from TA Instruments, The RMS error of all measurements when compared to well-established adiabatic calorimetry is <1% above 300 K, <3% below 200 K, and <2% between 200 and 300 K. Software for data analysis has been developed with options for all necessary corrections, namely temperature lag, heating rate, asymmetric correction, non-linear temperature calibration, etc. Since the initial setup of the instrument, more than 30 different samples have been analyzed. It is shown in this paper that this technique can improve the precision and reduce the experimental time compared to the normal, triple-run DSC. For the low-temperature experiment, some important modifications of the instrument have been made which improve the baseline performance. Some hands-on experience is discussed. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. NR 31 TC 6 Z9 7 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD OCT 26 PY 1993 VL 226 BP 155 EP 161 DI 10.1016/0040-6031(93)80216-W PG 7 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA ML659 UT WOS:A1993ML65900018 ER PT J AU WUNDERLICH, B JIN, YM AF WUNDERLICH, B JIN, YM TI THE THERMAL-PROPERTIES OF 4 ALLOTROPES OF CARBON SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 21st North-American-Thermal-Analysis-Society Conference CY SEP 13-16, 1992 CL ATLANTA, GA SP N AMER THERMAL ANAL SOC ID HEAT-CAPACITY MEASUREMENTS; LINEAR MACROMOLECULES; SOLID-STATE; VIBRATIONAL FREQUENCIES; MOLECULAR-DYNAMICS; NORMAL-MODES; C-60; C60; BUCKMINSTERFULLERENE; CLUSTER AB The heat capacities of diamond, graphite, and the fullerenes C-60 and C-70, are compared and linked to their approximate vibrational spectra. Because all the allotropes have the chemical composition C, their ultimate heat capacity is the Dunlog-Petit value 3R = 24.9 J K-1 mol(-1). At low temperatures (0-50 K), the fullerenes have a much higher heat capacity than the other two allotropes. As the temperature is increased, graphite and the fullerenes approach approximately equal heat capacities. Up to 1000 K, diamond has a lower heat capacity, but then, because of its weaker C-C bonds compared to the conjugated double bonds in graphite and the fullerenes, it exceeds the heat capacities of the latter. Fullerenes have crystal to plastic-crystal transitions in the region 250-350 K with entropies in agreement with the orientational entropy increase derivable from Walden's rule. Their sublimation pressures reach atmospheric pressure at about 1500 K, and the entropies of transition, when corrected for the entropy of fusion (Richards' rule), obey Trouton's rule. Carbon is thus a textbook example for the differences in thermal behavior possible as a function of chemical bonding and structure. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP WUNDERLICH, B (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 42 TC 13 Z9 14 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD OCT 26 PY 1993 VL 226 BP 169 EP 176 DI 10.1016/0040-6031(93)80218-Y PG 8 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA ML659 UT WOS:A1993ML65900020 ER PT J AU GIBSON, JK STUMP, NA AF GIBSON, JK STUMP, NA TI SPECTROSCOPIC INVESTIGATION OF THE THERMAL-DECOMPOSITION OF EUROPIUM OXALATE SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 21st North-American-Thermal-Analysis-Society Conference CY SEP 13-16, 1992 CL ATLANTA, GA SP N AMER THERMAL ANAL SOC ID ION AB The mechanism associated with the thermal decomposition of europium oxalate remains enigmatic, despite the fact that considerable attention has been given to it. Various Eu(II) and Eu(III) intermediates have been invoked to explain experimental observations of the decomposition. We have used Raman and luminescence spectroscopies in conjunction with differential thermal analysis to pursue further the thermal decomposition of europium oxalate. Our results are consistent with the sequential formation of two trivalent, oxycarbonate intermediates; evidence for a divalent europium intermediate was not obtained. RP GIBSON, JK (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 14 TC 10 Z9 10 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD OCT 26 PY 1993 VL 226 BP 301 EP 310 DI 10.1016/0040-6031(93)80231-X PG 10 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA ML659 UT WOS:A1993ML65900033 ER PT J AU TANG, Y BRAUNSTEIN, R VONROEDERN, B AF TANG, Y BRAUNSTEIN, R VONROEDERN, B TI DETERMINATION OF DRIFT MOBILITY AND LIFETIME FOR DOMINANT CHARGE-CARRIERS IN POLYCRYSTALLINE CUINSE2 BY PHOTOMIXING SO APPLIED PHYSICS LETTERS LA English DT Article ID PHASE-SHIFT ANALYSIS; THIN-FILMS AB Drift mobility and lifetime for the dominant charge carriers in polycrystalline CuInSe2 were determined for the first time by a photomixing technique. Evidence for a continuous distribution of localized states in the band gap near the extended states was provided. The temperature dependence of the photoconductive charge transport was found to be determined by multiple trapping processes. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP TANG, Y (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 12 TC 18 Z9 19 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 OCT 25 PY 1993 VL 63 IS 17 BP 2393 EP 2395 DI 10.1063/1.110485 PG 3 WC Physics, Applied SC Physics GA MD959 UT WOS:A1993MD95900029 ER PT J AU GINLEY, DS ASHBY, CIH PLUT, TA UREA, D SIEGAL, MP MARTENS, JS AF GINLEY, DS ASHBY, CIH PLUT, TA UREA, D SIEGAL, MP MARTENS, JS TI DICARBOXYLIC-ACID-BASED AND TRICARBOXYLIC-ACID-BASED ETCHES FOR PROCESSING HIGH-TEMPERATURE SUPERCONDUCTING THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article AB The development of passive and active electronics from high temperature superconducting thin films depends on the development of process technology capable of producing appropriate feature sizes without degrading the key superconducting properties. We present a new class of chelating etches based on di- and tricarboxylic acids that are compatible with positive photoresists and can produce submicrometer feature sizes while typically producing increases the microwave surface resistance at 94 GHz by less than 10%. This simple etching process works well for both the Y-Ba-Cu-O and Tl-Ba-Ca-Cu-O systems. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. CONDUCTUS,SUNNYVALE,CA 94086. RP GINLEY, DS (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 21 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 OCT 25 PY 1993 VL 63 IS 17 BP 2429 EP 2431 DI 10.1063/1.110497 PG 3 WC Physics, Applied SC Physics GA MD959 UT WOS:A1993MD95900041 ER PT J AU CARROLL, MR SUTTON, SR RIVERS, ML WOOLUM, DS AF CARROLL, MR SUTTON, SR RIVERS, ML WOOLUM, DS TI AN EXPERIMENTAL-STUDY OF KRYPTON DIFFUSION AND SOLUBILITY IN SILICIC GLASSES SO CHEMICAL GEOLOGY LA English DT Article ID MID-ATLANTIC RIDGE; GAS-PROBE ANALYSIS; NOBLE-GASES; VITREOUS SILICA; CARBON-DIOXIDE; BASALT GLASSES; RARE-GASES; HELIUM; AR; MINERALS AB Kr diffusivity and solubility have been measured in glasses of SiO2, NaAlSi3O8, KAlSi3O8 and rhyolitic composition, under experimental conditions ranging from 700-degrees to 950-degrees-C and 215 to 3150 bar. Kr diffusion in SiO2 (Sil) and NaAlSi3O8 (Alb) glass compositions at 700-950-degrees-C can be described by the following Arrhenius relations, with D in cm2 s-1, E in cal mol-1, Tin kelvins: D(Kr,Sil) = (3.16(-2.11)+6.28).10(-7) exp[-27599(+/-2455))/RT D(Kr,Alb) = (3.46(-1.85)+3.98).10(-3) exp[-41893(+/-1671)/RT] Limited data for rhyolite suggest Kr diffusivities similar to those measured in Alb, while one experiment on orthoclasic glass (800-degrees-C) shows Kr diffusivity to be approximately 16 times faster than in Alb at the same temperature. The data on Kr diffusivity agree with trends of increasing activation energy and decreasing diffusion rates as the gas atom size increases, as observed for He, Ne and Ar in amorphous silicates. The measured Kr solubilities in Alb and Sil are independent of temperature and are an approximately linear function of pressure up to at least 415 bar and possibly to several kilobars although we have only a small number of higher-pressure experiments. The new results for Kr and published data on He, Ne and Ar solubility clearly document large solubility variations which depend both on silicate composition and gas atom size, with highest solubilities observed for the smallest gas atoms in the most silica-rich melts/glasses. There is a good correlation between Kr solubility and melt ionic porosity in ultramafic through rhyolitic melt compositions; this provides a useful tool for predicting Kr solubilities in melt compositions that have not been studied experimentally. In natural systems the changes in noble ps solubility due to melt composition differences will far exceed changes due to temperature effects on solubility. C1 CALIF STATE UNIV FULLERTON,DEPT PHYS,FULLERTON,CA 92634. UNIV CHICAGO,DEPT GEOPHYS SCI,CHICAGO,IL 60637. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP CARROLL, MR (reprint author), UNIV BRISTOL,DEPT GEOL,WILLS MEM BLDG,BRISTOL BS8 1RJ,ENGLAND. NR 65 TC 25 Z9 25 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD OCT 25 PY 1993 VL 109 IS 1-4 BP 9 EP 28 DI 10.1016/0009-2541(93)90059-R PG 20 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MP561 UT WOS:A1993MP56100002 ER PT J AU PRANGE, R ZARKA, P BALLESTER, GE LIVENGOOD, TA DENIS, L CARR, T REYES, F BAME, SJ MOOS, HW AF PRANGE, R ZARKA, P BALLESTER, GE LIVENGOOD, TA DENIS, L CARR, T REYES, F BAME, SJ MOOS, HW TI CORRELATED VARIATIONS OF UV AND RADIO EMISSIONS DURING AN OUTSTANDING JOVIAN AURORAL EVENT SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID KILOMETRIC RADIATION; SOLAR-WIND; GEOMAGNETIC-ACTIVITY; SOURCE LOCATION; ENERGY-SOURCE; MU-M; JUPITER; GENERATION; MODEL; IO AB An exceptional Jovian aurora was detected in the FUV on December 21, 1990, by means of Vilspa and Goddard Space Flight Center (GFSC) International Ultraviolet Explorer (IUE) observations. This event included intensification by a factor of three between December 20 and 21, leading to the brightest aurora identified in the IUE data analyzed, and, in the north, to a shift of the emission peak towards larger longitudes (these variations are even more dramatic once the actual source brightness distribution is retrieved from the raw data). The Jovian radio emission simultaneously recorded at decameter wavelengths in Nancay also exhibits significant changes, from a weak and short-duration emission on December 20 to a very intense one, lasting several hours, on December 21. Confirmation of this intense radio event is also found in the observations at the University of Florida on December 21. The emissions are identified as right-handed Io-independent ''A'' (or ''non Io-A'') components from the northern hemisphere. The radio source region deduced from the Nancay observations lies, for both days, close to the UV peak emission, exhibiting in particular a similar shift of the source region toward larger longitudes from one day to the next. A significant broadening of the radio source was also observed and it is shown that on both days, the extent of the radio source closely followed the longitude range for which the UV brightness exceeds a given threshold (approximately 3 kW m-1). The correlated variations, both in intensity and longitude, strongly suggest that a common cause triggered the variation of the UV and radio emissions during this exceptional event. On one hand, the variation of the UV aurora could possibly be interpreted according to the Prange and Elkhamsi (1991) model of diffuse multicomponent auroral precipitation (electron and ion): it would arise from an increase in the precipitation rate of ions together with an inward shift of their precipitation locus from L almost-equal-to 10 to L almost-equal-to 6. On the other hand, the analysis of Ulysses observations in the upstream solar wind suggests that a significant disturbance in the solar wind, involving the generation of an interplanetary shock and the presence of a CME have interacted with the Jovian magnetosphere at about the time of the auroral event. Both arguments suggest that we may have observed for the first time a magnetic storm-type interaction in an outer planet magnetosphere, affecting simultaneously several auroral processes. Conversely, the observed relationship between the level of UV auroral activity and the detection of decameter emission (DAM), if it were a typical feature, might argue in favour of a more direct and permanent association between the auroral processes leading to UV and radio aurorae. possibly related to ''discrete-arc''-like activity and electron precipitation. C1 STN RADIOASTRON NANCAY,RADIOASTRON DECAMETR GRP,F-18330 NEUVY BARANGEON,FRANCE. JOHNS HOPKINS UNIV,CTR ASTROPHYS SCI,BALTIMORE,MD 21218. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. OBSERV PARIS,ARPEGES,F-92195 MEUDON,FRANCE. INST ASTROPHYS,F-75014 PARIS,FRANCE. UNIV OXFORD,DEPT EARTH SCI,OXFORD,ENGLAND. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV FLORIDA,DEPT ASTRON,GAINESVILLE,FL 32611. RP PRANGE, R (reprint author), UNIV PARIS 11,INST ASTROPHYS SPATIALE,F-91405 ORSAY,FRANCE. RI Livengood, Timothy/C-8512-2012 NR 55 TC 37 Z9 37 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 OCT 25 PY 1993 VL 98 IS E10 BP 18779 EP 18791 DI 10.1029/93JE01802 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA ME266 UT WOS:A1993ME26600012 ER PT J AU PETROVICH, F YOON, SK THREAPLETON, MJ PHILPOTT, RJ CARR, JA DIETRICH, FS HANSEN, LF AF PETROVICH, F YOON, SK THREAPLETON, MJ PHILPOTT, RJ CARR, JA DIETRICH, FS HANSEN, LF TI CONSISTENT FOLDING MODEL DESCRIPTION OF NUCLEON ELASTIC, INELASTIC, AND CHARGE-EXCHANGE SCATTERING FROM LI-6,LI-7 AT 25-50 MEV SO NUCLEAR PHYSICS A LA English DT Article ID 2-NUCLEON EFFECTIVE INTERACTION; MICROSCOPIC OPTICAL-MODEL; PROTON-SCATTERING; DENSITY DEPENDENCE; POLARIZED PROTONS; MOMENTUM-TRANSFER; FINITE NUCLEI; LIGHT-NUCLEI; FORM-FACTORS; NEUTRON AB The results of a consistent theoretical microscopic single scattering model study of nucleon elastic, inelastic, and charge-exchange scattering from Li-6, Li-7 at E(p(n)) = 25-50 MeV are reported. A realistic effective nucleon-nucleon interaction, adopted from the work of Mahaux and collaborators and Bertsch and coworkers, has been employed in the model calculations. The density distributions needed to describe the structure of the mass 6 and 7 systems in the calculations are the same as those used in recent proton-nucleus scattering studies of these targets at E(p) = 200 MeV. The present, parameter-free model calculations provide an excellent description of the available low-energy nucleon-nucleus scattering data on Li-6, Li-7. C1 FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PETROVICH, F (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 73 TC 36 Z9 37 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD OCT 25 PY 1993 VL 563 IS 3 BP 387 EP 433 DI 10.1016/0375-9474(93)90120-M PG 47 WC Physics, Nuclear SC Physics GA ME895 UT WOS:A1993ME89500002 ER PT J AU DAI, J GUINION, JF VEGA, R AF DAI, J GUINION, JF VEGA, R TI USING B-TAGGING TO DETECT T(T)OVER-BAR-HIGGS-BOSON PRODUCTION WITH H-]B(B)OVER-BAR SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTERMEDIATE-MASS HIGGS; COLLISIONS; BOSONS; QUARKS AB We demonstrate that expected efficiencies and purities for b tagging at the detectors at the Superconducting Super Collider and the CERN Large Hadron Collider may allow detection of the standard model Higgs boson in ttHBAR production, with H --> bbBAR decay, for 80 less than or similar to m(H) less than or similar to 130 GeV, provided m(t) greater than or similar to 130 GeV. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS INST HIGH ENERGY PHYS,DAVIS,CA 95616. SO METHODIST UNIV,DEPT PHYS,DALLAS,TX 75275. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP DAI, J (reprint author), RUTGERS UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855, USA. NR 13 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 OCT 25 PY 1993 VL 71 IS 17 BP 2699 EP 2702 DI 10.1103/PhysRevLett.71.2699 PG 4 WC Physics, Multidisciplinary SC Physics GA MD947 UT WOS:A1993MD94700005 ER PT J AU HAMSTER, H SULLIVAN, A GORDON, S WHITE, W FALCONE, RW AF HAMSTER, H SULLIVAN, A GORDON, S WHITE, W FALCONE, RW TI SUBPICOSECOND, ELECTROMAGNETIC PULSES FROM INTENSE LASER-PLASMA INTERACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID GENERATION; ABSORPTION AB Laser pulses with a power of 10(12) W and a duration of 10(-13) s were focused onto both gas and solid targets. Strong emission of pulsed radiation at terahertz frequencies was observed from the resulting plasmas. The most intense radiation was detected from solid density targets and was correlated with the emission of MeV x rays and electrons. Results indicate that radiative processes in such plasmas are driven by ponderomotively induced space charge fields in excess of 10(8) V/cm. This work constitutes the first direct observation of a laser-induced wake field. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP HAMSTER, H (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 25 TC 357 Z9 370 U1 8 U2 57 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 OCT 25 PY 1993 VL 71 IS 17 BP 2725 EP 2728 DI 10.1103/PhysRevLett.71.2725 PG 4 WC Physics, Multidisciplinary SC Physics GA MD947 UT WOS:A1993MD94700012 ER PT J AU GARRISON, K CHANG, Y JOHNSON, PD AF GARRISON, K CHANG, Y JOHNSON, PD TI SPIN POLARIZATION OF QUANTUM-WELL STATES IN COPPER THIN-FILMS DEPOSITED ON A CO(001) SUBSTRATE SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXCHANGE; ENERGY; SUPERLATTICES; PHOTOEMISSION; RADIATION; ANALYZER; LAYERS AB Spin polarized photoemission is used to examine the spin polarization of the quantum well states observed in copper films grown on a fcc Co(001) substrate. The states are observed to predominantly carry minority spin polarization and this is shown through comparison with calculation to reflect a preferential hybridization in the interface. The calculation also provides evidence that the quantum well states observed in the experiments are not only sp derived but also reflect the hybridization with the more localized copper d bands. RP GARRISON, K (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 24 TC 146 Z9 146 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 25 PY 1993 VL 71 IS 17 BP 2801 EP 2804 DI 10.1103/PhysRevLett.71.2801 PG 4 WC Physics, Multidisciplinary SC Physics GA MD947 UT WOS:A1993MD94700031 ER PT J AU JELLISON, GE AF JELLISON, GE TI DATA-ANALYSIS FOR SPECTROSCOPIC ELLIPSOMETRY SO THIN SOLID FILMS LA English DT Article ID POLARIZATION MODULATION ELLIPSOMETRY; ANISOTROPIC MEDIA; MATRIX-METHOD; THIN-FILM; OPTICAL FUNCTIONS; DEPTH-PROFILE; DISPERSION; GAAS AB The modeling of spectroscopic ellipsometry data is reviewed, and is divided into three phases. The first phase involves the calculation of the Fresnel reflection coefficients for a given layer structure; it is shown that the Abeles formalism provides the most flexibility, and can be readily related. to the Berreman formalism for calculations involving anisotropic layers. The second phase is to parameterize the optical functions of each individual layer; several models are reviewed, including effective media, the Lorentz oscillator and a recent parameterization of amorphous semiconductors. The final phase involves the fitting of the spectroscopic ellipsometry data to the model, where different figures of merit of the fitting function are discussed. A proper numerical analysis technique requires that the reduced chi2 be used as the figure of merit, which will result in the proper weighting of data points, and in obtaining meaningful error limits and a measure of the goodness of fit. RP JELLISON, GE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 37 TC 203 Z9 205 U1 8 U2 54 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 OCT 25 PY 1993 VL 234 IS 1-2 BP 416 EP 422 DI 10.1016/0040-6090(93)90298-4 PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MD341 UT WOS:A1993MD34100024 ER PT J AU WITTEN, A AF WITTEN, A TI A FIELD DEMONSTRATION OF VARIABLE-DENSITY DIFFRACTION TOMOGRAPHY SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SEISMIC DATA AB Geophysical diffraction tomography (GDT) was first suggested in 1984 as a quantitative method for high-resolution subsurface imaging. In this early form, the imaged quantity is the so called ''object function'' which is linearly related to the, square of the complex refractive index. More recently, two algorithms have been proposed for separately imaging the spatial variations of the more fundamental mechanical properties of density and compressibility based on the GDT approach, acoustic measurements, and the exploitation of multiple frequencies. It was concluded in these works that these algorithms would not be sufficiently robust for the inherently noisy field applications. The postulated problems result from the existence of the density gradient appearing in the governing equation. In this study, these variable density algorithms were applied to acoustic data acquired at a site known to contain the buried skeletal remains of a dinosaur. For one of the algorithms tested, images of object function and normalized density and compressibility of a buried bone were reconstructed that exhibited image sharpness consistent with the frequencies employed. In addition, the images of this bone, that was subsequently excavated, properly render its size and location and yielded qualitatively correct density and compressibility. RP WITTEN, A (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 0 Z9 0 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 OCT 22 PY 1993 VL 20 IS 20 BP 2155 EP 2158 DI 10.1029/93GL01654 PG 4 WC Geosciences, Multidisciplinary SC Geology GA ME862 UT WOS:A1993ME86200001 ER PT J AU FARRELL, WM MACDOWALL, RJ DESCH, MD KAISER, ML STONE, RG KELLOGG, PJ LIN, N CORNILLEAUWEHRLIN, N CANU, P BAME, SJ PHILLIPS, JL AF FARRELL, WM MACDOWALL, RJ DESCH, MD KAISER, ML STONE, RG KELLOGG, PJ LIN, N CORNILLEAUWEHRLIN, N CANU, P BAME, SJ PHILLIPS, JL TI ULYSSES OBSERVATIONS OF AURORAL HISS AT HIGH JOVIAN LATITUDES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SPACELAB-2 ELECTRON-BEAM; WHISTLER-MODE RADIATION; POLAR MAGNETOSPHERE; RADIO-EMISSION; JUPITER; INJECTION; WAVES; CUSP AB During the Ulysses flyby of Jupiter, a whistler-mode emission was periodically detected by the Unified Radio and Plasma wave (URAP) experiment during intervals when the spacecraft extended to high magnetic latitudes. The signal was detected between the local electron plasma frequency and lower hybrid resonance and appears as a funnel-shaped structure on frequency-versus-time spectrograms; these characteristics are very reminiscent of whistler-mode auroral hiss observed at high latitudes at Earth. Ray tracing of the emission occurrences suggests the emission source is on magnetic field lines extending out to at least 65 R(J). This location associates the emission with the boundary between open and closed field lines - not the Io torus. The emission radiates about 10(7) W of power. Consequently, the auroral input power derived from the solar wind to drive the emission is believed to be 10(10-12) W (or about 1% of the energy associated with lo torus electrical processes). C1 CTR RECH PHYS ENVIRONNEMENT TERR & PLANETAIRE,F-92131 ISSY MOULINEAUX,FRANCE. UNIV MINNESOTA,SCH ASTRON & ASTROPHYS,MINNEAPOLIS,MN 55455. LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545. RP FARRELL, WM (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771, USA. RI MacDowall, Robert/D-2773-2012; Farrell, William/I-4865-2013 NR 23 TC 11 Z9 11 U1 0 U2 2 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 OCT 22 PY 1993 VL 20 IS 20 BP 2259 EP 2262 DI 10.1029/93GL01120 PG 4 WC Geosciences, Multidisciplinary SC Geology GA ME862 UT WOS:A1993ME86200027 ER PT J AU SARA, SJ DEVAUGES, V BIEGON, A AF SARA, SJ DEVAUGES, V BIEGON, A TI MAUDSLEY RAT STRAINS, SELECTED FOR DIFFERENCES IN EMOTIONAL RESPONSES, DIFFER IN BEHAVIORAL-RESPONSE TO CLONIDINE AND IN [I-125] CLONIDINE BINDING IN THE LOCUS-CERULEUS SO BEHAVIOURAL BRAIN RESEARCH LA English DT Note DE LOCUS-CERULEUS; ALPHA-2-ADRENOCEPTOR; CLONIDINE; QUANTITATIVE AUTORADIOGRAPHY; MAUDSLEY RAT ID NEURONS; ACTIVATION AB Maudsley rats, selectively inbred for emotionality for over sixty generations, differ in reactivity to stress, both at the peripheral level and within the central noradrenergic system. The present experiments examine to what extent these central differences might be due to differences in the inhibitory processes mediated by alpha2 autoreceptors within the locus coeruleus. Maudsley reactive rats (MRs), the strain which showed a much higher central noradrenergic response to immobilisation stress, required higher doses of the alpha2 receptor agonist, clonidine, to induce behavioral sedation than the Maudsley non-reactive rats (MNRA). Autoradiographic studies showed a significantly higher level of binding of 125iodeclonidine in the locus coeruleus of the MNRAs compared to the MRs, indicating that the former had more alpha2 receptors and/or these receptors had a greater affinity for the agonist. Thus autoinhibitory processes within the locus coeruleus are different in the the two strains, which could account for the differences in reactivity to stress seen in the biochemical and behavioral studies. C1 LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. RP SARA, SJ (reprint author), UNIV PARIS 06,INST NEUROSCI,CNRS,9 QUAI ST BERNARD,F-75230 PARIS 05,FRANCE. NR 15 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-4328 J9 BEHAV BRAIN RES JI Behav. Brain Res. PD OCT 21 PY 1993 VL 57 IS 1 BP 101 EP 104 DI 10.1016/0166-4328(93)90065-X PG 4 WC Behavioral Sciences; Neurosciences SC Behavioral Sciences; Neurosciences & Neurology GA MF869 UT WOS:A1993MF86900011 PM 8292249 ER PT J AU HALL, GE WU, M AF HALL, GE WU, M TI PHOTOFRAGMENT VECTOR CORRELATIONS MEASURED BY TRANSIENT ABSORPTION-SPECTROSCOPY - CN FRAGMENTS FROM ETHYL THIOCYANATE PHOTODISSOCIATION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID POTENTIAL-ENERGY SURFACES; ANGULAR-MOMENTUM; VELOCITY DISTRIBUTION; DIODE-LASER; 248 NM; POLARIZATION; DYNAMICS; PRODUCT; ICN; FLUORESCENCE AB The correlated angular distribution of translational and rotational motion of photofragments is probed by Doppler-broadened transient absorption line shapes. The one-photon nature of the probe process reduces the complexity of the analysis, while maintaining sensitivity to five bipolar moments of the translational and rotational angular distributions. The 193-nm photodissociation of C2H5SCN illustrates the method, with CN products detected with a titanium:sapphire ring laser probing the A2PI-X2SIGMA+ transition. The vector correlations in the high rotational states of CN indicate a direct dissociation following a transition of mixed symmetry at 193 nm: the recoil is preferentially but not exclusively parallel to a transition moment, and the perpendicular component is dominated by a rotation axis parallel to a C2H5SCN transition moment. The strong rotational excitation is generated by planar bending forces in a bent excited state. Lower rotational states are formed with a composite kinetic energy distribution, indicating an additional, slower, less highly polarized channel that partitions more energy into the unobserved C2H5S radical than does the direct channel. At 248 nm, a weaker absorption also generates CN photofragments with a preferentially parallel recoil, requiring a reassessment of the excited-state assignments in the alkyl thiocyanates. RP HALL, GE (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Hall, Gregory/D-4883-2013 OI Hall, Gregory/0000-0002-8534-9783 NR 42 TC 38 Z9 38 U1 2 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 OCT 21 PY 1993 VL 97 IS 42 BP 10911 EP 10919 DI 10.1021/j100144a003 PG 9 WC Chemistry, Physical SC Chemistry GA MD089 UT WOS:A1993MD08900003 ER PT J AU TAGUE, TJ ANDREWS, L HUNT, RD AF TAGUE, TJ ANDREWS, L HUNT, RD TI MATRIX INFRARED-SPECTRA OF THE PRODUCTS OF URANIUM-ATOM REACTIONS WITH CARBON-MONOXIDE AND CARBON-DIOXIDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article AB Uranium atoms from pulsed Nd:YAG laser ablation of a uranium metal target were codeposited with carbon monoxide and carbon dioxide in excess argon at 10 K. Infrared spectra following the U + CO reaction revealed strong new absorption bands at 804.4 and 852.6 cm-1, which are assigned to the CUO product on the basis of isotopic shifts, FG matrix calculations, and ab initio pseudopotential calculations. An absorption at 2027.5 cm-1 is attributed to the asymmetric secondary reaction product CU(O)CO. In both the U + CO and U + CO2 reactions, bands at 870.9 and 1963.8 cm-1 were observed and assigned to the association product Of UO2 and CO. Lastly, in the U + CO2 experiments, new absorption band pairs were observed at 804.4 and 1799.6 cm-1 and at 801.5 and 2011.7 cm-1. The former pair was almost destroyed on annealing and is assigned to the OUCO insertion product. The latter pair is attributed to an OCU(O)CO species. The direct reaction of U atoms with CO and CO2 requires an activation energy, which is provided by hyperthermal U atoms from pulsed laser evaporation. C1 UNIV VIRGINIA,DEPT CHEM,CHARLOTTESVILLE,VA 22901. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 25 TC 23 Z9 24 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 OCT 21 PY 1993 VL 97 IS 42 BP 10920 EP 10924 DI 10.1021/j100144a004 PG 5 WC Chemistry, Physical SC Chemistry GA MD089 UT WOS:A1993MD08900004 ER PT J AU SCHULTZ, JR VERSTUYFT, JG GONG, EL NICHOLS, AV RUBIN, EM AF SCHULTZ, JR VERSTUYFT, JG GONG, EL NICHOLS, AV RUBIN, EM TI PROTEIN-COMPOSITION DETERMINES THE ANTI-ATHEROGENIC PROPERTIES OF HDL IN TRANSGENIC MICE SO NATURE LA English DT Article ID HIGH-DENSITY-LIPOPROTEIN; APOLIPOPROTEIN-A-I; CORONARY-ARTERY DISEASE; CHOLESTEROL EFFLUX; PARTICLES; ATHEROSCLEROSIS; SIZE; SUSCEPTIBILITY; EXPRESSION; CELLS AB HIGH-DENSITY lipoprotein (HDL) contains two major proteins, apolipoprotein A-I (apoA-I) and apolipoprotein A-II (apoA-II), comprising about 70% and 20% of the total HDL protein mass, respectively. HDL exists in human plasma in two main forms, one containing apoA-I with apoA-II (AI/AII-HDL) and another containing apoA-I without apoA-II (AI-HDL). A strong inverse relationship exists between total plasma HDL concentration and atherosclerosis, but the results of studies examining the relationship between AI-HDL and AI/AII-HDL and atherosclerosis have been conflicting1-9. To determine whether these two HDL populations have different effects on atherogenesis, human apoA-I (AI) and human apoA-I and apoA-II (AI/AII) transgenic mice were produced in an atherosclerosis-susceptible strain10-12. Following an atherogenic diet, despite similar total cholesterol and HDL cholesterol concentrations, the area of atherogenic lesions in the AI/AII mice was 15-fold greater than in the AI animals. These studies show that the protein composition of HDL significantly affects its role in atherogenesis and that AI-HDL is more anti-atherogenic than AI/AII-HDL. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 30 TC 231 Z9 234 U1 1 U2 5 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 21 PY 1993 VL 365 IS 6448 BP 762 EP 764 DI 10.1038/365762a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MC812 UT WOS:A1993MC81200066 PM 8413656 ER PT J AU PRESS, OW EARY, JF APPELBAUM, FR MARTIN, PJ BADGER, CC NELP, WB GLENN, S BUTCHKO, G FISHER, D PORTER, B MATTHEWS, DC FISHER, LD BERNSTEIN, ID AF PRESS, OW EARY, JF APPELBAUM, FR MARTIN, PJ BADGER, CC NELP, WB GLENN, S BUTCHKO, G FISHER, D PORTER, B MATTHEWS, DC FISHER, LD BERNSTEIN, ID TI RADIOLABELED-ANTIBODY THERAPY OF B-CELL LYMPHOMA WITH AUTOLOGOUS BONE-MARROW SUPPORT SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Article ID NON-HODGKINS-LYMPHOMA; MONOCLONAL-ANTIBODY; ANTI-CD37 ANTIBODY; TRANSPLANTATION; DOSIMETRY; RADIOIMMUNOTHERAPY; TOXICITY; ANTIGEN; DISEASE; TARGET AB Background. Radiolabeled monoclonal antibodies recognizing B-lymphocyte surface antigens represent a potentially effective new therapy for lymphomas. We assessed the biodistribution, toxicity, and efficacy of anti-CD20 (B1 and 1F5) and anti-CD37 (MB-1) antibodies labeled with iodine-131 in 43 patients with B-cell lymphoma in relapse. Methods. Sequential biodistribution studies were performed with escalating doses of antibody (0.5, 2.5, and 10 mg per kilogram of body weight) trace-labeled with 5 to 10 mCi of I-131. The doses of radiation absorbed by tumors and normal organs were estimated by serial gamma-camera imaging and tumor biopsies. Patients whose tumors were estimated to receive greater doses of radiation than the liver, lungs, or kidneys (i.e., patients with a favorable biodistribution) were eligible for therapeutic infusion of I-131-labeled antibodies according to a phase 1 dose-escalation protocol. Results. Twenty-four patients had a favorable biodistribution, and 19 received therapeutic infusions of 234 to 777 mCi of I-131-labeled antibodies (58 to 1168 mg) followed by autologous marrow reinfusion, resulting in complete remission in 16, a partial response in 2, and a minor response (25 to 50 percent regression of tumor) in 1. Nine patients have remained in continuous complete remission for 3 to 53 months. Toxic effects included myelosuppression, nausea, infections, and two episodes of cardiopulmonary toxicity, and were moderate in patients treated with doses of I-131-labeled antibodies that delivered less than 27.25 Gy to normal organs. Conclusions. High-dose radioimmunotherapy with I-131-labeled antibodies is associated with a high response rate in patients with B-cell lymphoma in whom antibody biodistribution is favorable. C1 COULTER CORP, MIAMI, FL USA. FIRST HILL DIAGNOST RADIOL, SEATTLE, WA USA. UNIV WASHINGTON, DEPT MED, SEATTLE, WA 98195 USA. UNIV WASHINGTON, DEPT PEDIAT, SEATTLE, WA 98195 USA. UNIV WASHINGTON, DEPT RADIOL, SEATTLE, WA 98195 USA. UNIV WASHINGTON, DEPT BIOL STRUCT, SEATTLE, WA 98195 USA. UNIV WASHINGTON, DEPT BIOSTAT, SEATTLE, WA 98195 USA. FRED HUTCHINSON CANC RES CTR, SEATTLE, WA 98104 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. FU NCI NIH HHS [P01CA44991] NR 29 TC 571 Z9 574 U1 0 U2 4 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD OCT 21 PY 1993 VL 329 IS 17 BP 1219 EP 1224 DI 10.1056/NEJM199310213291702 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA MB988 UT WOS:A1993MB98800002 PM 7692295 ER PT J AU WU, X APRAHAMIAN, A CASTROERON, J BAKTASH, C AF WU, X APRAHAMIAN, A CASTROERON, J BAKTASH, C TI IDENTICAL BANDS AND MULTIPHONON VIBRATIONS SO PHYSICS LETTERS B LA English DT Article ID COLLECTIVE-COORDINATE METHOD; ANHARMONIC GAMMA-VIBRATIONS; MICROSCOPIC DESCRIPTION; NUCLEI; ALIGNMENT AB We report on the first observation of a set of identical, dynamical moments of inertia within the same nucleus corresponding to different quanta of vibrational phonons, The examples shown are those of gamma and gammagamma vibrations in the deformed rare-earth region of nuclei. It is suggested that the determination of dynamical moments of inertia may be a signature of multi-phonon vibrational bands in deformed nuclei everywhere in the chart of nuclides. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WU, X (reprint author), UNIV NOTRE DAME,NOTRE DAME,IN 46556, USA. NR 25 TC 23 Z9 23 U1 1 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 OCT 21 PY 1993 VL 316 IS 2-3 BP 235 EP 239 DI 10.1016/0370-2693(93)90319-D PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MC479 UT WOS:A1993MC47900004 ER PT J AU WILSON, WK BEEDOE, S BOUGTEB, M CAILIU, J CARROLL, J GONG, WG HALLMAN, T HEILBRONN, L HUANG, HZ IGO, G KIRK, P KREBS, G LETESSIERSELVON, A MADANSKY, L MANSO, F MATIS, HS MILLER, D MILLER, J NAUDET, C PORTER, RJ ROCHE, G SCHROEDER, LS SEIDL, P TOY, M WANG, ZF WELSH, R YEGNESWARAN, A AF WILSON, WK BEEDOE, S BOUGTEB, M CAILIU, J CARROLL, J GONG, WG HALLMAN, T HEILBRONN, L HUANG, HZ IGO, G KIRK, P KREBS, G LETESSIERSELVON, A MADANSKY, L MANSO, F MATIS, HS MILLER, D MILLER, J NAUDET, C PORTER, RJ ROCHE, G SCHROEDER, LS SEIDL, P TOY, M WANG, ZF WELSH, R YEGNESWARAN, A TI RELATIVE DIELECTRON YIELDS IN P+P AND P+D INTERACTIONS FROM E(BEAM) = 1.0-4.9 GEV SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; P-BE COLLISIONS; DILEPTON; MASS AB The beam energy and invariant mass dependence of the dielectron yield in p + d interactions relative to the yield in p + p interactions is presented for incident kinetic energies from 1.0-4.9 GeV. The ratio of the yield in p + d interactions to that in p + p interactions decreases from 10.5 +/- 1.6 at 1.0 GeV to 1.96 +/- 0.08 at 4.9 GeV for electron pairs with invariant masses greater-than-or-equal-to 0.15 GeV/c2. The large ratio at 1.0 GeV suggests that dielectron production in the p + d system is dominated by a p + n process. The beam energy dependence of the ratio indicates that this p + n contribution decreases with respect to the other dielectron sources as the incident energy is increased. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CLERMONT FERRAND,IN2P3,F-63177 CLERMONT FERRAND,FRANCE. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. NORTHWESTERN UNIV,EVANSTON,IL 60201. RP WILSON, WK (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Heilbronn, Lawrence/J-6998-2013 OI Heilbronn, Lawrence/0000-0002-8226-1057 NR 22 TC 20 Z9 20 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 OCT 21 PY 1993 VL 316 IS 2-3 BP 245 EP 249 DI 10.1016/0370-2693(93)90321-8 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MC479 UT WOS:A1993MC47900006 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T MONALDI, D NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T FREY, A GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GEORGE, S GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MORGADO, CJS OMARA, JA TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S BORZEMSKI, P CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GILKINSON, DJ GLASER, R GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KROGER, W KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T VOGEL, W WESTPHAL, D WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MATTHEWS, C MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR, I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M MINE, S NAGASAWA, Y NAGIRA, T NAKAO, M OKUNO, H SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A SACCHI, R STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y AF DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T MONALDI, D NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T FREY, A GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GEORGE, S GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MORGADO, CJS OMARA, JA TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S BORZEMSKI, P CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GILKINSON, DJ GLASER, R GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KROGER, W KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T VOGEL, W WESTPHAL, D WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MATTHEWS, C MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR, I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M MINE, S NAGASAWA, Y NAGIRA, T NAKAO, M OKUNO, H SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A SACCHI, R STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI MEASUREMENT OF THE PROTON STRUCTURE-FUNCTION F2 IN EP SCATTERING AT HERA SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; INELASTIC MUON SCATTERING; JET FRAGMENTATION; E+E-PHYSICS; MODEL; ZEUS; QCD AB This paper presents our first measurement of the F2 structure function in neutral-current, deep inelastic scattering using the ZEUS detector at HERA, the ep colliding beam facility at DESY. The data correspond to an integrated luminosity of 24.7 nb-1. Results are presented for data in a range of Q2 from 10 GeV2 to 4700 GeV2 and Bjorken x down to 3.0 x 10(-4). The F2 structure function increases rapidly as x decreases. C1 UNIV BOLOGNA, I-40126 BOLOGNA, ITALY. INFN BOLOGNA, BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. COLUMBIA UNIV, NEVIS LAB, IRVINGTON, NY USA. INST NUCL PHYS, PL-31342 KRAKOW, POLAND. STANISLAW STASZIC UNIV MIN & MET, FAC PHYS & NUCL TECH, PL-30059 KRAKOW, POLAND. JAGIELLONIAN UNIV, DEPT PHYS, PL-31007 KRAKOW, POLAND. DESY, W-2000 HAMBURG 52, GERMANY. DESY ZEUTHEN, INST HOCHENENERGIEPHYS, ZEUTHEN, GERMANY. UNIV FLORENCE, I-50121 FLORENCE, ITALY. INFN, FLORENCE, ITALY. INFN, LAB NAZL FRASCATI, FRASCATI, ITALY. UNIV FREIBURG, INST PHYS, W-7800 FREIBURG, GERMANY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HAMBURG, INST EXPTL PHYS 1, W-2000 HAMBURG 13, GERMANY. UNIV HAMBURG, INST EXPTL PHYS 2, W-2000 HAMBURG 13, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, HIGH ENERGY NUCL PHYS GRP, LONDON SW7 2AZ, ENGLAND. UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH 1, GERMANY. KOREA UNIV, SEOUL, SOUTH KOREA. LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA. UNIV AUTONOMA MADRID, DEPT FIS TEOR, MADRID 34, SPAIN. UNIV MANITOBA, DEPT PHYS, WINNIPEG R3T 2N2, MANITOBA, CANADA. MCGILL UNIV, DEPT PHYS, MONTREAL H3A 2T5, QUEBEC, CANADA. MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW, RUSSIA. NIKHEF, AMSTERDAM, NETHERLANDS. OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND. UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY. INFN, PADUA, ITALY. PENN STATE UNIV, DEPT PHYS, UNIV PK, PA 16802 USA. UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. INFN, ROME, ITALY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA. UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN 21, GERMANY. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV TOKYO, INST NUCL STUDY, TOKYO 113, JAPAN. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO 158, JAPAN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10124 TURIN, ITALY. INFN, TURIN, ITALY. TORINO UNIV, FAC SCI 2, ALESSANDRIA, ITALY. INFN, ALESSANDRIA, ITALY. UNIV TORONTO, DEPT PHYS & ASTRON, TORONTO M5S 1A1, ONTARIO, CANADA. VIRGINIA POLYTECH INST & STATE UNIV, DEPT PHYS, BLACKSBURG, VA 24061 USA. UNIV WARSAW, INST EXPTL PHYS, PL-00325 WARSAW, POLAND. INST NUCL STUDIES, WARSAW, POLAND. WEIZMANN INST SCI, DEPT NUCL PHYS, REHOVOT, ISRAEL. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. YORK UNIV, DEPT PHYS, N YORK, ON, CANADA. UNIV BRISTOL, HH WILLS PHYS LAB, BRISTOL BS8 1TL, AVON, ENGLAND. RP ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RI Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Frasconi, Franco/K-1068-2016; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Wiggers, Leo/B-5218-2015 OI Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Frasconi, Franco/0000-0003-4204-6587; Castellini, Guido/0000-0002-0177-0643; Anzivino, Giuseppina/0000-0002-5967-0952; iori, maurizio/0000-0002-6349-0380; Lancaster, Mark/0000-0002-8872-7292; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Wiggers, Leo/0000-0003-1060-0520 NR 47 TC 254 Z9 254 U1 0 U2 12 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 OCT 21 PY 1993 VL 316 IS 2-3 BP 412 EP 426 DI 10.1016/0370-2693(93)90347-K PG 15 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MC479 UT WOS:A1993MC47900032 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 BOURQIN, 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, J 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 OGANTINI, 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 BOURQIN, 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, J 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 OGANTINI, 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 SEARCH FOR LEPTON FLAVOR VIOLATION IN Z-DECAYS SO PHYSICS LETTERS B LA English DT Article ID HIGH-ENERGIES; RADIATIVE-CORRECTIONS; PHOTON CORRECTIONS; BHABHA SCATTERING; Z(0) DECAYS; MONTE-CARLO; DETECTOR; MODEL; TAU AB We have searched for lepton flavour violation in Z boson decays into lepton pairs using all data collected with the L3 detector during the 1990, 1991 and 1992 runs on an event sample corresponding to 1 500 000 Z's produced. At the 95% confidence level the upper limits on the branching ratio for Z --> emu is 0.6 x 10(-5), for Z --> etau this is 1.3 x 10(-5) and for Z-mutau this is 1.9 X 10(-5). 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. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. LAB ANNECY LE VIEUX PHYS PARTICULES, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. UNIV BUCHAREST, R-76900 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 02139 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, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. CTR INVEST ENERGETICAS MEDIOAMBIENTALES & TECHNOL, E-28040 MADRID, SPAIN. INFN, SEZ MILANO, I-20133 MILAN, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW, RUSSIA. INFN, SEZ NAPOLI, 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, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, SEZ ROMA, 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 PARTICLILAS ELENTALES, 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 HOCHENBERGIEPHYS, 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, SEZ FIRENZE, I-50125 FLORENCE, ITALY. RI van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Roth, Stefan/J-2757-2016; 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; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015 OI van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; Filthaut, Frank/0000-0003-3338-2247; 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; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532 NR 29 TC 39 Z9 39 U1 2 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 OCT 21 PY 1993 VL 316 IS 2-3 BP 427 EP 434 DI 10.1016/0370-2693(93)90348-L PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MC479 UT WOS:A1993MC47900033 ER PT J AU KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T AOKI, S FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M KOMATSU, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M OKADA, K TAJIMA, H TOSHITOU, T YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OHASHI, S OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J KEGAMI, S IKAZUNO, M KOYA, T NIU, E OGAWA, S SHIBUYA, H WATANABE, S YASUDA, N SATO, Y SESHIMO, M TEZUKA, I BAHK, SY KIM, SK AF KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T AOKI, S FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M KOMATSU, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M OKADA, K TAJIMA, H TOSHITOU, T YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OHASHI, S OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J KEGAMI, S IKAZUNO, M KOYA, T NIU, E OGAWA, S SHIBUYA, H WATANABE, S YASUDA, N SATO, Y SESHIMO, M TEZUKA, I BAHK, SY KIM, SK TI OBSERVATION OF D(+) -]RHO(770)(0)MU(+)NU SO PHYSICS LETTERS B LA English DT Article ID HEAVY MESONS; DECAYS AB We report the first observation of the Cabibbo disfavored semileptonic decay mode D+ --> rho(770)0mu+nu and measure its decay rate relative to the Cabibbo favored mode D+ --> K*BAR (892)0mu+nu to be GAMMA(D+ --> rho(770)0mu+nu/GAMMA(D+ --> K*BAR(892)0mu+nu = 0.044(+0.031/-0.025) (stat.) +/- 0.014 (syst.). The results are compared to theoretical predictions and to previous experimental upper limits. C1 UNIV CALIF DAVIS, DAVIS, CA 95616 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. CHONNAM NATL UNIV, KWANGJU 500757, SOUTH KOREA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. GIFU UNIV, GIFU 50111, JAPAN. GYEONGSANG NATL UNIV, JINJU 660300, SOUTH KOREA. KINKI UNIV, OSAKA, OSAKA 577, JAPAN. KOBE UNIV, KOBE 657, JAPAN. KOREA UNIV, SEOUL 136701, SOUTH KOREA. NAGOYA INST TECHNOL, NAGOYA, AICHI 466, JAPAN. NAGOYA UNIV, NAGOYA, AICHI 464, JAPAN. OHIO STATE UNIV, COLUMBUS, OH 43210 USA. OKAYAMA UNIV, OKAYAMA 700, JAPAN. UNIV OKLAHOMA, NORMAN, OK 73019 USA. OSAKA CITY UNIV, OSAKA 558, JAPAN. SCI EDUC INST OSAKA PREFECTURE, OSAKA 558, JAPAN. TOHO UNIV, FUNABASHI, CHIBA 274, JAPAN. UTSUNOMIYA UNIV, UTSUNOMIYA, TOCHIGI 321, JAPAN. WONKWANG UNIV, IRI 570749, SOUTH KOREA. RP AICHI UNIV EDUC, KARIYA 448, JAPAN. RI Russ, James/P-3092-2014; Aoki, Shigeki/L-6044-2015 OI Russ, James/0000-0001-9856-9155; NR 22 TC 20 Z9 20 U1 0 U2 2 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 OCT 21 PY 1993 VL 316 IS 2-3 BP 455 EP 462 DI 10.1016/0370-2693(93)90351-H PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MC479 UT WOS:A1993MC47900036 ER PT J AU LARSON, AR AF LARSON, AR TI UNSTABLE RESONATOR MODES FOR LASERS WITH CIRCULAR MIRRORS AND HIGH FRESNEL NUMBERS SO APPLIED OPTICS LA English DT Article DE UNSTABLE RESONATORS; BARE-CAVITY MODES; HIGH FRESNEL NUMBER; CIRCULAR MIRRORS ID ASYMPTOTIC THEORY AB The design of unstable resonators for large lasers with high Fresnel numbers and circular mirrors requires an ability to calculate their mode structures. Four methods for obtaining mode structure by solving the complex integral equation are analyzed. Included are a numerical method, two hybrid methods, and a virtual-source method. The hybrid-methods are basically analytical methods with a special numerical integration of analytical solutions (over the feedback mirror) to obtain improved solutions in the output annulus. The hybrid methods are designed for use with high-Fresnel-number resonators. However, their applicability extends into the low-Fresnel-number regime, where a comparison shows one of the hybrid methods agreeing exceptionally well with the numerical method. For analysis at high Fresnel numbers, the hybrid and virtual-source methods are compared with each other. The two hybrid methods are expected to differ from each other in the central core region when the Fresnel number is low, but they are expected to agree with each other when the Fresnel number is high. For the hybrid comparison at a high Fresnel number, the next to lowest loss modes show a similar structure. However, lack of agreement for the lowest loss mode shows that approximations in the development of the second hybrid method cause the selection of the wrong geometrical mode. RP LARSON, AR (reprint author), LOS ALAMOS NATL LAB, MS F607, LOS ALAMOS, NM 87545 USA. NR 19 TC 1 Z9 1 U1 2 U2 3 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 OCT 20 PY 1993 VL 32 IS 30 BP 5872 EP 5884 PG 13 WC Optics SC Optics GA MC053 UT WOS:A1993MC05300005 PM 20856409 ER PT J AU HUNT, JT MANES, KR RENARD, PA AF HUNT, JT MANES, KR RENARD, PA TI HOT IMAGES FROM OBSCURATIONS SO APPLIED OPTICS LA English DT Article AB Certain damage observed on the optics in NOVA is consistent with a phenomenon akin to holographic imaging. (NOVA is the Lawrence Livermore National Laboratory's 10-beam Nd:glass laser used for inertial confinement fusion research.) The minimization of similar damage in next-generation laser systems is sought by first identifying the sources for these holographic images, specifying glass parameters appropriately, and staging the amplifier chain to circumvent the problem. The insight gained has lead to an explanation for a 20-year-old puzzle. RP HUNT, JT (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. NR 7 TC 72 Z9 85 U1 4 U2 15 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 OCT 20 PY 1993 VL 32 IS 30 BP 5973 EP 5982 PG 10 WC Optics SC Optics GA MC053 UT WOS:A1993MC05300018 PM 20856422 ER PT J AU GAO, W WESELY, ML DOSKEY, PV AF GAO, W WESELY, ML DOSKEY, PV TI NUMERICAL MODELING OF THE TURBULENT-DIFFUSION AND CHEMISTRY OF NOX, O3, ISOPRENE, AND OTHER REACTIVE TRACE GASES IN AND ABOVE A FOREST CANOPY SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID FLUX-GRADIENT RELATIONSHIPS; ATMOSPHERIC SURFACE-LAYER; DECIDUOUS FOREST; NATURAL HYDROCARBONS; CHEMICAL MECHANISM; PLANT CANOPIES; BOUNDARY-LAYER; PROFILES; VEGETATION; EMISSIONS AB A coupled diffusion-chemistry model was developed for the turbulent transport of reactive trace gases in and above a forest canopy. The one-dimensional model was used to study daytime vertical profiles of gaseous concentrations and fluxes and the influences of vertical distributions of solar irradiation and uptake and emission at leaves and the forest floor. The upper boundary of the model was extended to the top of the atmospheric boundary layer to allow adequate coupling at the atmosphere-forest interface. To study the effects of biogenic nonmethane hydrocarbons, chemical reactions for isoprene and its atmospheric oxidation products were linked with reactions for inorganic species and the oxidation of CO and CH4. Isoprene emission rates at various heights in the canopy were calculated as a function of local radiation, temperature, and leaf density distribution. Photolysis rates for photochemical reactions were allowed to vary with height according to the change in solar irradiation in the canopy. Vertical profiles Of O3, NO, NO2, NO(x), NO(y), OH, HNO3, H2O2, and isoprene concentrations and fluxes simulated for a specified deciduous forest were examined with a single set of measured and computed daytime micrometeorological conditions. Results show that for strongly depositing gases like O3, HNO3, and H2O2, deposition velocities appear to be insensitive to chemistry and to have a profile similar to those predicted for a nonreactive case (simulation without chemistry), although the fluxes are influenced by concentration changes caused by chemistry. Simulated profiles of isoprene concentration and flux agree closely with results for the nonreactive case, largely because of the dominant effects of emission and turbulent mixing. Chemical reactions have the most important influence on profiles of NO, NO2, and NO(x) concentrations and fluxes. With a small and representative NO emission forced at the forest floor, NO concentration decreases quickly with height near the ground and falls to a minimum value near the middle of the canopy because the chemical transformation of NO is fast while photodecomposition of NO2 is weak inside the canopy. As a result, the NO2 concentration becomes higher inside the canopy than above, and an upward NO2 flux occurs near the canopy top despite NO2 deposition in the canopy. The total flux of NO(x) near the canopy top appears to be downward because of strong downward NO flux. The flux of NO(y) above the canopy is almost invariant with height as chemical interchanges create no net effect on the total nitrogen flux, although a large flux divergence caused by dry deposition occurs inside the canopy. RP GAO, W (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,BLDG 203,ROOM J152,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 48 TC 69 Z9 70 U1 2 U2 16 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD OCT 20 PY 1993 VL 98 IS D10 BP 18339 EP 18353 DI 10.1029/93JD01862 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MD722 UT WOS:A1993MD72200004 ER PT J AU PICKERING, IJ GEORGE, GN DAMERON, CT KURZ, B WINGE, DR DANCE, IG AF PICKERING, IJ GEORGE, GN DAMERON, CT KURZ, B WINGE, DR DANCE, IG TI X-RAY-ABSORPTION SPECTROSCOPY OF CUPROUS THIOLATE CLUSTERS IN PROTEINS AND MODEL SYSTEMS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID METALLOTHIONEIN GENE FAMILY; YEAST METALLOTHIONEIN; TRANSCRIPTION FACTOR; FINE-STRUCTURE; SACCHAROMYCES-CEREVISIAE; MOLECULAR-STRUCTURE; COPPER CLUSTER; CRYSTAL; EXPRESSION; CHEMISTRY AB Cuprous-thiolate multimetallic clusters exist in a range of different biological molecules for which no structural information exists from X-ray crystallography. Spectroscopic tools such as X-ray absorption spectroscopy have provided the major structural insights into this family of biological molecules. Recent nuclear magnetic resonance data on silver-substituted metallothionein, thought to be analogous with the copper proteins, have suggested the presence of digonal coordination [Narula, S. S.; Mehra, R. K.; Winge, D. R.; Armitage, 1. M. J. Am. Chem. Soc. 1991, 113, 9354-9358]. In order to test this in the copper case, we have examined a series of structurally characterized cuprous-thiolate model compounds, containing different proportions of digonal and trigonal copper sites, using copper K-edge X-ray absorption spectroscopy. The edge spectra, which have been previously used as a probe for the average copper coordination environment in proteins, show little variation between the models, indicating that these are not useful as a probe of coordination environment in the case of cuprous-thiolate clusters (as opposed to isolated metal sites). We show that systematic trends in the average Cu-S bond length from EXAFS curve-fitting analysis can be used to obtain an estimate of the fraction of digonal and trigonal copper sites. This correlation is applied to a series of different proteins containing cuprous-thiolate clusters which are found to contain significant fractions of digonal copper. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94309. UNIV UTAH,MED CTR,DEPT MED,SALT LAKE CITY,UT 84132. UNIV UTAH,MED CTR,DEPT BIOCHEM,SALT LAKE CITY,UT 84132. UNIV NEW S WALES,SCH CHEM,KENSINGTON,NSW 2033,AUSTRALIA. RI George, Graham/E-3290-2013; Pickering, Ingrid/A-4547-2013; OI Pickering, Ingrid/0000-0002-0936-2994 NR 48 TC 124 Z9 125 U1 0 U2 11 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 OCT 20 PY 1993 VL 115 IS 21 BP 9498 EP 9505 DI 10.1021/ja00074a014 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA MD069 UT WOS:A1993MD06900014 ER PT J AU ARNEY, DSJ BURNS, CJ AF ARNEY, DSJ BURNS, CJ TI SYNTHESIS AND STRUCTURE OF HIGH-VALENT ORGANOURANIUM COMPLEXES CONTAINING TERMINAL MONOOXO FUNCTIONAL-GROUPS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID X-RAY STRUCTURE; URANIUM; CHEMISTRY; DYNAMICS; BENT C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC-1,LOS ALAMOS,NM 87545. NR 24 TC 113 Z9 113 U1 2 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 OCT 20 PY 1993 VL 115 IS 21 BP 9840 EP 9841 DI 10.1021/ja00074a077 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MD069 UT WOS:A1993MD06900077 ER PT J AU RODRIGUEZ, JA AF RODRIGUEZ, JA TI METAL-METAL BONDING ON SURFACES - ELECTRONIC AND CHEMICAL-PROPERTIES OF AG ON RU(001) SO SURFACE SCIENCE LA English DT Review ID SINGLE-CRYSTAL SURFACES; ENERGY-LOSS SPECTROSCOPY; RUTHENIUM 001 SURFACE; CO CHEMISORPTION; OXYGEN-ADSORPTION; MOLECULAR-OXYGEN; CARBON-MONOXIDE; PHOTOELECTRON-SPECTROSCOPY; ACCEPTOR INTERACTIONS; ETHYLENE EPOXIDATION AB The interaction between Ag and Ru(001) has been studied using TDS, XPS and XAES. Submonolayer coverages of Ag desorbed in the temperature range from 900 to 1050 K. The desorption of the Ag monolayer followed zero-order kinetics with an activation energy of 65 kcal/mol. By comparing the desorption temperatures of Cu, Ag and Au from W(110) and Ru(001), a direct relation was found between the bulk cohesive energy of a noble metal and its adsorption energy on a transition metal. A monolayer of Ag on Ru(001) shows Ag 3d levels and Auger MW transitions that are shifted approximately 0.1 eV toward lower binding energy with respect to those of the bulk atoms in pure Ag. In CO/Ag/Ru(001) surfaces, the interaction between Ag and Ru enhances the strength of the Ag-CO bond and weakens the Ru-CO bond. The CO-desorption temperature from one monolayer of Ag supported on Ru(001) is approximately 90 K higher than that found on Ag(111). This corresponds to an increase of approximately 5 kcal/mol in the strength of the Ag-CO bond. The results of CO-TDS and O(1s)-XPS show that the presence of Ag induces a reduction in the charge transfer from Ru into the CO(2pi*) orbitals, which weakens the Ru-CO bond by approximately 6 kcal/mol and shifts the O(1s) peak position 0.4 eV toward higher binding energy. Oxygen molecules adsorbed on Ag atoms bonded to Ru(001) exhibit non-equivalent oxygen atoms (probably a ''superoxo-like'' species), a desorption temperature of 230-240 K, and a very low probability for dissociation (0.05-0.15 at T < 250 K). RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 128 TC 34 Z9 34 U1 3 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 20 PY 1993 VL 296 IS 2 BP 149 EP 163 DI 10.1016/0039-6028(93)91143-D PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MC152 UT WOS:A1993MC15200004 ER PT J AU HRBEK, J YANG, YW RODRIGUEZ, JA AF HRBEK, J YANG, YW RODRIGUEZ, JA TI OXIDATION OF CESIUM MULTILAYERS SO SURFACE SCIENCE LA English DT Article ID LEVEL BINDING-ENERGIES; CHEMICAL-SHIFTS; OXYGEN; PHOTOEMISSION; RU(001); CS; POTASSIUM; FILMS; OXIDES AB The low temperature oxidation of Cs multilayers was studied using XPS. The Cs 3d5/2 and O 1s core levels were recorded repetitively while leaking oxygen into the experimental chamber, i.e. as a function of oxygen exposure. A negative binding energy shift and an intensity increase are seen for the Cs core level of the oxidized layer. Three O 1s peaks observed on the oxygen-saturated Cs film at 526.45, 530.30 and 533.65 eV are assigned to oxide, peroxide and superoxide ions, respectively. Our results imply that the oxygen species forming first is O2- and O2(2-) followed by O2-. At the onset of superoxide formation, the oxidized film undergoes a change in the electronic properties, probably a metal-insulator transition, that shifts the Cs and O core levels toward lower binding energies by almost 1 eV. This was observed for films with thicknesses ranging from 5 to 20 layers. RP HRBEK, J (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM 555,POB 5000,UPTON,NY 11973, USA. RI Hrbek, Jan/I-1020-2013 NR 21 TC 34 Z9 34 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 20 PY 1993 VL 296 IS 2 BP 164 EP 170 DI 10.1016/0039-6028(93)91144-E PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MC152 UT WOS:A1993MC15200005 ER PT J AU POTTER, BG SINCLAIR, MB DIMOS, D AF POTTER, BG SINCLAIR, MB DIMOS, D TI ELECTROOPTICAL CHARACTERIZATION OF PB(ZR,TI)O3 THIN-FILMS BY WAVE-GUIDE REFRACTOMETRY SO APPLIED PHYSICS LETTERS LA English DT Article AB Electric field-induced changes in the extraordinary and ordinary refractive indices of a Pb(Zr0.53Ti0.47)O3 thin film were independently determined using waveguide refractometry. Under an electric field, applied normal to the film plane and corresponding to saturation of the electric polarization, the ratio of the extraordinary to ordinary refractive index change (DELTAn(e)/DELTAn(o)) is found to be -4/1, contributing to a net birefringence change [DELTA(n(e)-n(o))] of -0.021. Using this technique, both diagonal and off-diagonal elements of the electro-optic response tensor describing the macroscopic behavior of the polycrystalline film were accessed, illustrating the importance of this approach in evaluating orientation-specific electro-optic characteristics in these films. RP POTTER, BG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 34 Z9 34 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 OCT 18 PY 1993 VL 63 IS 16 BP 2180 EP 2182 DI 10.1063/1.110576 PG 3 WC Physics, Applied SC Physics GA MC050 UT WOS:A1993MC05000006 ER PT J AU CHEN, Y LILIENTALWEBER, Z WASHBURN, J KLEM, JF TSAO, JY AF CHEN, Y LILIENTALWEBER, Z WASHBURN, J KLEM, JF TSAO, JY TI NONCONSERVATIVE FORMATION OF (100) MISFIT DISLOCATION ARRAYS AT IN0.2GA0.8AS/GAAS(001) INTERFACES DURING POSTGROWTH ANNEALING SO APPLIED PHYSICS LETTERS LA English DT Article AB Transmission electron microscopy is applied to investigate the effect of annealing on misfit dislocations in an In0.2Ga0.8As/GaAs(001) heterostructure. In as-grown samples, an orthogonal array of 60-degrees dislocations along [110] directions is observed in the interface. During annealing, the 60-degrees dislocations along [110] directions are bent from [110] directions toward [100] directions. The process represents a new strain relaxation mechanism in semiconductor heterostructures. As the dislocation segments along [100] can relieve the strain more effectively than 60-degrees dislocations, we propose that the dislocations move nonconservatively in or near the interface by diffusion along the dislocation cores or in the heterointerface. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP CHEN, Y (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 9 TC 4 Z9 4 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 OCT 18 PY 1993 VL 63 IS 16 BP 2234 EP 2236 DI 10.1063/1.110537 PG 3 WC Physics, Applied SC Physics GA MC050 UT WOS:A1993MC05000024 ER PT J AU KOELLE, D MIKLICH, AH LUDWIG, F DANTSKER, E NEMETH, DT CLARKE, J AF KOELLE, D MIKLICH, AH LUDWIG, F DANTSKER, E NEMETH, DT CLARKE, J TI DC SQUID MAGNETOMETERS FROM SINGLE LAYERS OF YBA2CU3O7-X SO APPLIED PHYSICS LETTERS LA English DT Article ID FLUX TRANSFORMERS; 1/F NOISE AB We have fabricated magnetometers patterned in a single layer of YBa2Cu3O7-x involving dc superconducting quantum interference devices (SQUIDs) with bicrystalline grain boundary junctions. The magnetometers consist of either a SQUID with a large area square washer or a single turn pickup loop coupled directly to the body of a small area SQUID. We found that the transfer function falls off with increasing SQUID inductance much more rapidly than predicted; implications for magnetometer performance are discussed. When operated at 77 K with a bias reversal technique a directly coupled magnetometer had a noise of (105 +/- 10) fT Hz -1/2 at 1 kHz, increasing to (145 +/- 10) fT Hz -1/2 at 1 Hz. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Koelle, Dieter/E-5111-2011 NR 17 TC 106 Z9 106 U1 0 U2 5 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 OCT 18 PY 1993 VL 63 IS 16 BP 2271 EP 2273 DI 10.1063/1.110526 PG 3 WC Physics, Applied SC Physics GA MC050 UT WOS:A1993MC05000037 ER PT J AU BEREZHIANI, ZG RATTAZZI, R AF BEREZHIANI, ZG RATTAZZI, R TI INVERSE HIERARCHY APPROACH TO FERMION MASSES SO NUCLEAR PHYSICS B LA English DT Article ID STRONG CP-PROBLEM; UNIVERSAL SEESAW MECHANISM; GRAND UNIFIED THEORIES; BROKEN GAUGE-SYMMETRY; RADIATIVE QUARK MASS; LEPTON MASSES; ELECTRON MASS; MIXING ANGLES; SUPERSYMMETRIC MODELS; PERMUTATION SYMMETRY AB The first fermion family might play a special role in understanding the physics of flavour. This possibility is suggested by the observation that the up-down splitting within quark families increases with the family number: m(u) is similar to m(d), m(c) > m(s), m(t) >> m(b). We construct a model that realizes this feature of the spectrum in a natural way. The inter-family hierarchy is first generated by radiative phenomena in a sector of heavy isosinglet fermions and then transferred to quarks by means of a universal seesaw. A crucial role is played by left-right parity and up-down isotopic symmetry. No family symmetry is introduced. The model implies m(u)/m(d) > 0.5 and the Cabibbo angle is forced to be is similar to square-root m(d)/m(s). The top quark is naturally in the 100 GeV range, but not too heavy: m(t) < 150 GeV. Inspired by the mass matrices obtained in the model for quarks, we suggest an ansatz also including charged leptons. The differences between u-, d- and e-type fermions are simply parametrized by three complex coefficients epsilon(u), epsilon(d) and epsilon(e). Additional consistent predictions are obtained: m(s) = 100-150 MeV and m(u)/m(d) < 0.75. C1 GEORGIAN ACAD SCI,INST PHYS,TBILISI 380077,REP OF GEORGIA. LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP BEREZHIANI, ZG (reprint author), UNIV MUNICH,SEKT PHYS,W-8000 MUNICH 2,GERMANY. RI Berezhiani, Zurab/H-7221-2016 OI Berezhiani, Zurab/0000-0002-4156-1686 NR 94 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD OCT 18 PY 1993 VL 407 IS 2 BP 249 EP 270 DI 10.1016/0550-3213(93)90057-V PG 22 WC Physics, Particles & Fields SC Physics GA MC275 UT WOS:A1993MC27500001 ER PT J AU SEVRIN, A THIELEMANS, K TROOST, W AF SEVRIN, A THIELEMANS, K TROOST, W TI INDUCED AND EFFECTIVE GRAVITY THEORIES IN D=2 SO NUCLEAR PHYSICS B LA English DT Article ID CONFORMAL FIELD-THEORIES; NON-ABELIAN BOSONIZATION; WESS-ZUMINO ACTION; 2 DIMENSIONS; SUPERCONFORMAL ALGEBRAS; W3 GRAVITY; FRACTAL STRUCTURE; LIE-ALGEBRAS; GAUGE; QUANTIZATION AB As a preparation for the study of arbitrary extensions of d = 2 gravity we present a detailed investigation of SO(N) supergravity. Induced d = 2, SO(N) supergravity is constructed by gauging a chiral, nilpotent subgroup of the OSp(N\2) Wess-Zumino-Witten model. In order to get a gauge-invariant theory with the correct number of degrees of freedom, we need to introduce N free fermions. From this we derive an all-order expression for the effective action. Reality of the coupling constant imposes the usual restrictions on c for N = 0 and 1. No such restrictions appear for N greater-than-or-equal-to 2. For N = 2, 3 and 4, no renormalizations of the coupling constant beyond one-loop occur. Also, in the effective N = 4 gravity based upon a linear N = 4 superconformal algebra, there is no renormalization at all, i.e. the quantum theory is equal to the classical. These results are related to non-renormalization theorems for theories with extended supersymmetries. Arbitrary (super)extensions of d = 2 gravity are then analyzed. The induced theory is represented by a WZW model for which a chiral, solvable group is gauged. From this, we obtain the effective action. All order expressions for both the coupling constant renormalization and the wave-function renormalization are given. From this we classify all extensions of d = 2 gravity for which the coupling constant gets at most a one-loop renormalization. As an application of the general strategy, N = 4 theories based on D(2, 1, alpha) and SU(1, 1\2), all WA gravities and the N = 2 W(n) models are treated in some detail. C1 UNIV LEUVEN,INST THEORET FYS,B-3001 LOUVAIN,BELGIUM. LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP SEVRIN, A (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Sevrin, Alexander/D-5794-2017; OI Sevrin, Alexander/0000-0001-6564-9941; Thielemans, Kris/0000-0002-5514-199X NR 68 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD OCT 18 PY 1993 VL 407 IS 2 BP 459 EP 512 DI 10.1016/0550-3213(93)90067-Y PG 54 WC Physics, Particles & Fields SC Physics GA MC275 UT WOS:A1993MC27500011 ER PT J AU ALEXANDREAS, DE ALLEN, GE BERLEY, D BILLER, S BURMAN, RL CAVALLISFORZA, M CHANG, CY CHEN, ML CHUMNEY, P COYNE, D DION, C DION, GM DORFAN, D ELLSWORTH, RW GOODMAN, JA HAINES, TJ HARMON, M HOFFMAN, CM KELLEY, L KLEIN, S NAGLE, DE SCHMIDT, DM SCHNEE, R SINNIS, C SHOUP, A STARK, MJ WEEKS, DD WILLIAMS, DA WU, JP YANG, T YODH, GB ZHANG, WP AF ALEXANDREAS, DE ALLEN, GE BERLEY, D BILLER, S BURMAN, RL CAVALLISFORZA, M CHANG, CY CHEN, ML CHUMNEY, P COYNE, D DION, C DION, GM DORFAN, D ELLSWORTH, RW GOODMAN, JA HAINES, TJ HARMON, M HOFFMAN, CM KELLEY, L KLEIN, S NAGLE, DE SCHMIDT, DM SCHNEE, R SINNIS, C SHOUP, A STARK, MJ WEEKS, DD WILLIAMS, DA WU, JP YANG, T YODH, GB ZHANG, WP TI NEW LIMIT ON THE RATE-DENSITY OF EVAPORATING BLACK-HOLES SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAMMA-RAY BURSTS AB Data taken with the CYGNUS detector between 1989 September and 1993 January have been used to search for 1 s bursts of ultrahigh-energy gamma rays from point sources at arbitrary locations in the northern sky. We find no evidence for such bursts. We set a theory-dependent upper limit on the rate-density of evaporating black holes of 8.5 x 10(5) pc-3 yr-1 at the 99% C.L. When the same emission spectrum is used to recalculate previous upper limits based on direct searches, this limit is the most restrictive by nearly 2 orders of magnitude. C1 UNIV CALIF IRVINE,IRVINE,CA 92716. UNIV MARYLAND,COLL PK,MD 20740. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. GEORGE MASON UNIV,FAIRFAX,VA 22030. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92507. NATL SCI FDN,WASHINGTON,DC 20550. RI Cavalli-Sforza, Matteo/H-7102-2015 NR 14 TC 35 Z9 35 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 OCT 18 PY 1993 VL 71 IS 16 BP 2524 EP 2527 DI 10.1103/PhysRevLett.71.2524 PG 4 WC Physics, Multidisciplinary SC Physics GA MC119 UT WOS:A1993MC11900004 ER PT J AU ABE, K ABT, I ACTON, PD AGNEW, G ASH, WW ASTON, D BACCHETTA, N BAIRD, KG BALTAY, C BAND, HR BARANKO, G BARDON, O BATTISTON, R BAZARKO, AO BEAN, A BELCINSKI, RJ BENDAVID, R BENVENUTI, AC BIASINI, M BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CARR, J CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHADWICK, GB CHEN, L CHURCH, E CLAUS, R COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYLE, PA COYNE, DG DOLIVERIRA, A DAMERELL, CJS DASU, S DESANGRO, R DESIMONE, P DESIMONE, S DELLORSO, R DU, YC DUBOIS, R DUNWOODIE, W EIGEN, G EISENSTEIN, BI ELIA, R FAN, C FERO, MJ FREY, R FRIEDMAN, JI FURUNO, K GALLINARO, M GILLMAN, A GLADDING, G GONZALEZ, S HALLEWELL, GD HANSLKOZANECKA, T HART, EL HASEGAWA, K HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HITLIN, DG HONMA, A HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y IZEN, JM JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAISER, S KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KELSEY, MH KENDALL, HW KIM, HY KIM, PC KING, M KING, R KOFLER, RR KOWITT, M KRISHNA, NM KROEGER, RS KWON, Y LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MAJID, WA MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASUDA, H MAZZUCATO, E MCGOWAN, JF MCKEMEY, AK MEADOWS, BT MELLOR, DJ MESSNER, R MOCKETT, PM MOFFEIT, KC MORRISON, RJ MOURS, B MUELLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OSBORNE, LS PANVINI, RS PARK, H PAULUZZI, M PAVEL, TJ PERRIER, F PERUZZI, I PESCARA, L PETRADZA, M PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE RICHMAN, JD ROCHESTER, LS ROSENSON, L ROTHBERG, JE ROWSON, PC RUSSELL, JJ SAEZ, P SANTOCCHIA, A SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHULTZ, D SCHUMM, BA SEIDEN, A SERVOLI, L SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SIMOPOULOS, C SMITH, SR SNYDER, JA SOKOLOFF, MD STAMER, P STEINER, H STEINER, R STOCKDALE, IE STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TECCHIO, M THALER, JJ TOGE, N TORRANCE, E TURCOTTE, M TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, S WAITE, AP WATTS, SJ WEIDEMANN, AW WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WITHERELL, MS WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHOU, J ZUCCHELLI, P AF ABE, K ABT, I ACTON, PD AGNEW, G ASH, WW ASTON, D BACCHETTA, N BAIRD, KG BALTAY, C BAND, HR BARANKO, G BARDON, O BATTISTON, R BAZARKO, AO BEAN, A BELCINSKI, RJ BENDAVID, R BENVENUTI, AC BIASINI, M BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CARR, J CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHADWICK, GB CHEN, L CHURCH, E CLAUS, R COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYLE, PA COYNE, DG DOLIVERIRA, A DAMERELL, CJS DASU, S DESANGRO, R DESIMONE, P DESIMONE, S DELLORSO, R DU, YC DUBOIS, R DUNWOODIE, W EIGEN, G EISENSTEIN, BI ELIA, R FAN, C FERO, MJ FREY, R FRIEDMAN, JI FURUNO, K GALLINARO, M GILLMAN, A GLADDING, G GONZALEZ, S HALLEWELL, GD HANSLKOZANECKA, T HART, EL HASEGAWA, K HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HITLIN, DG HONMA, A HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y IZEN, JM JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAISER, S KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KELSEY, MH KENDALL, HW KIM, HY KIM, PC KING, M KING, R KOFLER, RR KOWITT, M KRISHNA, NM KROEGER, RS KWON, Y LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MAJID, WA MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASUDA, H MAZZUCATO, E MCGOWAN, JF MCKEMEY, AK MEADOWS, BT MELLOR, DJ MESSNER, R MOCKETT, PM MOFFEIT, KC MORRISON, RJ MOURS, B MUELLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OSBORNE, LS PANVINI, RS PARK, H PAULUZZI, M PAVEL, TJ PERRIER, F PERUZZI, I PESCARA, L PETRADZA, M PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE RICHMAN, JD ROCHESTER, LS ROSENSON, L ROTHBERG, JE ROWSON, PC RUSSELL, JJ SAEZ, P SANTOCCHIA, A SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHULTZ, D SCHUMM, BA SEIDEN, A SERVOLI, L SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SIMOPOULOS, C SMITH, SR SNYDER, JA SOKOLOFF, MD STAMER, P STEINER, H STEINER, R STOCKDALE, IE STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TECCHIO, M THALER, JJ TOGE, N TORRANCE, E TURCOTTE, M TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, S WAITE, AP WATTS, SJ WEIDEMANN, AW WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WITHERELL, MS WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHOU, J ZUCCHELLI, P TI MEASUREMENT OF A(S) FROM JET RATES AT THE Z(0) RESONANCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID E+E ANNIHILATION; MONTE-CARLO; ALPHA-S AB We have determined the strong coupling alpha(s) from measurements of jet rates in hadronic decays of Z0 bosons collected by the SLD experiment at SLAC. Using six collinear and infrared safe jet algorithms we compared our data with the predictions of QCD calculated up to second order in perturbation theory, and also with resummed calculations. We find alpha(s)(M(Z)2)=0.118+/-0.002(stat)+/-0.003(syst) +/-0.010 (theory), where the dominant uncertainty is from uncalculated higher order contributions. C1 TOHOKU UNIV,SENDAI,MIYAGI 980,JAPAN. BOSTON UNIV,BOSTON,MA 02215. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. CALTECH,PASADENA,CA 91125. UNIV CINCINNATI,CINCINNATI,OH 45221. COLUMBIA UNIV,NEW YORK,NY 10027. INDIANA UNIV,BLOOMINGTON,IN 47405. UNIV COLORADO,BOULDER,CO 80309. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. UNIV PADUA,I-35100 PADUA,ITALY. UNIV PISA,I-56100 PISA,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. IST NAZL FIS NUCL,I-35100 PADUA,ITALY. IST NAZL FIS NUCL,I-06100 PERUGIA,ITALY. IST NAZL FIS NUCL,I-56100 PISA,ITALY. KEK,NATL LAB,TSUKUBA,IBARAKI 305,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. NAGOYA UNIV,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. RUTGERS UNIV,PISCATAWAY,NJ 08855. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV GENOA,I-16146 GENOA,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MASSACHUSETTS,AMHERST,MA 01003. UNIV OREGON,EUGENE,OR 97403. UNIV TENNESSEE,KNOXVILLE,TN 37996. UNIV WASHINGTON,SEATTLE,WA 98195. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV VICTORIA,TRIUMF,VICTORIA V8W 3P6,BC,CANADA. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, K (reprint author), ADELPHI UNIV,GARDEN CITY,NY 11530, USA. RI Servoli, Leonello/E-6766-2012; de Sangro, Riccardo/J-2901-2012; de Simone, Patrizia/J-3549-2012; Perrier, Frederic/A-5953-2011; Cavalli-Sforza, Matteo/H-7102-2015; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016 OI Servoli, Leonello/0000-0003-1725-9185; de Sangro, Riccardo/0000-0002-3808-5455; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636 NR 23 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 18 PY 1993 VL 71 IS 16 BP 2528 EP 2532 DI 10.1103/PhysRevLett.71.2528 PG 5 WC Physics, Multidisciplinary SC Physics GA MC119 UT WOS:A1993MC11900005 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A 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 BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A 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 BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI INCLUSIVE CHI-C AND B-QUARK PRODUCTION IN (P)OVER-BAR-P COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRONIC COLLISIONS; CROSS-SECTION; HEAVY; J/PSI AB We report the full reconstruction of chi(c) mesons through the decay chain chi(c) --> J/psigamma, J/psi --> mu+mu-, using data obtained at the Collider Detector at Fermilab in 2.6 +/- 0.2 pb-1 of ppBAR collisions at square-root s = 1.8 TeV. This exclusive chi(c) sample is used to measure the chi(c)-meson production cross section times branching fractions. We obtain sigma x B = 3.2 +/- 0.4(stat)-1.1(+1.2)(syst) nb for chi(c) mesons decaying to J/psi with p(T) > 6.0 GeV/c and pseudorapidity Absolute value of eta < 0.5. From this and the inclusive J/psi cross section we calculate the inclusive b-quark cross section to be 12.0 +/- 4.5 mub for pT(b) > 8.5 GeV/c and \y(b)\ < 1. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV WISCONSIN,MADISON,WI 53706. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. TUFTS UNIV,MEDFORD,MA 02155. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T5,QUEBEC,CANADA. UNIV TORONTO,TORONTO M5S 1A1,ONTARIO,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. KEK,NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. 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. TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; 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 22 TC 122 Z9 122 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 OCT 18 PY 1993 VL 71 IS 16 BP 2537 EP 2541 DI 10.1103/PhysRevLett.71.2537 PG 5 WC Physics, Multidisciplinary SC Physics GA MC119 UT WOS:A1993MC11900007 ER PT J AU ABE, F ALBROW, M AKIMOTO, H 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 BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BROMBERG, C 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 CONWAY, J COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DENINNO, M DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ENGELS, E ELY, R ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FREIDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J 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 HIPPLE, R HOLLEBEEK, R HOLSCHER, A HONG, S HOUK, G HU, P HUSTON, J 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 KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, H 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 MAKSIMOVIC, P 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 MILLER, R 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 PROUDFOOT, J PRODUIT, N PTOHOS, F PUNZI, G 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 SINGH, P SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, S STRAHL, K 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 UKEGAWA, F UNAL, G UEMURA, N VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, Q 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, L ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AKIMOTO, H 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 BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BROMBERG, C 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 CONWAY, J COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DENINNO, M DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ENGELS, E ELY, R ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FREIDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J 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 HIPPLE, R HOLLEBEEK, R HOLSCHER, A HONG, S HOUK, G HU, P HUSTON, J 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 KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, H 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 MAKSIMOVIC, P 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 MILLER, R 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 PROUDFOOT, J PRODUIT, N PTOHOS, F PUNZI, G 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 SINGH, P SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, S STRAHL, K 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 UKEGAWA, F UNAL, G UEMURA, N VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, Q 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, L ZHANG, S ZHANG, W ZUCCHELLI, S TI SEARCH FOR QUARK COMPOSITENESS, AXIGLUONS, AND HEAVY-PARTICLES USING THE DIJET INVARIANT MASS-SPECTRUM OBSERVED IN P(P)OVER-BAR COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID = 1.8 TEV; PBARP COLLISIONS; DISTRIBUTIONS; CALORIMETER; EVENTS AB The dijet invariant mass distribution has been measured in the region between 140 and 1000 GeV/c2, in 1.8 TeV ppBAR collisions. Data collected with the Collider Detector at Fermilab show agreement with QCD calculations. A limit on quark compositeness of LAMBDA(c) > 1.3 TeV is obtained. Axigluons with masses between 240 and 640 GeV/c2 are excluded at 95% C.L. if we assume ten open decay channels. Model-independent limits on the production of heavy particles decaying into two jets are also presented. C1 PURDUE UNIV,W LAFAYETTE,IN 47907. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. ROCKEFELLER UNIV,NEW YORK,NY 10021. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RUTGERS UNIV,PISCATAWAY,NJ 08854. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27708. TEXAS A&M UNIV SYST,COLL STN,TX 77843. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WISCONSIN,MADISON,WI 53706. 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. KEK,NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. 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. SUPERCOND SUPER COLLIDER LAB,DALLAS,TX 75237. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. 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 19 TC 24 Z9 24 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 OCT 18 PY 1993 VL 71 IS 16 BP 2542 EP 2546 DI 10.1103/PhysRevLett.71.2542 PG 5 WC Physics, Multidisciplinary SC Physics GA MC119 UT WOS:A1993MC11900008 ER PT J AU KORMANYOS, CM PETERSON, RJ SHEPARD, JR WISE, JE BART, S CHRIEN, RE LEE, L CLAUSEN, BL PIEKAREWICZ, J BARAKAT, MB MICHAEL, RA KISHIMOTO, T AF KORMANYOS, CM PETERSON, RJ SHEPARD, JR WISE, JE BART, S CHRIEN, RE LEE, L CLAUSEN, BL PIEKAREWICZ, J BARAKAT, MB MICHAEL, RA KISHIMOTO, T TI K+-NUCLEUS QUASI-ELASTIC SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELASTIC ELECTRON-SCATTERING; FINITE NUCLEI AB K+-nucleus quasielastic cross sections measured for a laboratory kaon beam momentum of 705 MeV/c are presented for 3-momentum transfers of 300 and 500 MeV/c. The measured differential cross sections for C, Ca, and Pb at 500 MeV/c are used to deduce the effective number of nucleons participating in the scattering, which axe compared with estimates based on the eikonal approximation. The long mean free path expected for K+ mesons in nuclei is found. Double differential cross sections for C and Ca are compared to relativistic nuclear structure calculations. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. LOMA LINDA UNIV,LOMA LINDA,CA 92350. SUPERCOMP COMP RES INST,TALLAHASSEE,FL 32306. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. OHIO UNIV,DEPT PHYS,ATHENS,OH 45701. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. RP KORMANYOS, CM (reprint author), UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309, USA. OI Clausen, Benjamin Leroy/0000-0001-9894-7830 NR 17 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 OCT 18 PY 1993 VL 71 IS 16 BP 2571 EP 2574 DI 10.1103/PhysRevLett.71.2571 PG 4 WC Physics, Multidisciplinary SC Physics GA MC119 UT WOS:A1993MC11900015 ER PT J AU TAKIGAWA, M HULTS, WL SMITH, JL AF TAKIGAWA, M HULTS, WL SMITH, JL TI COMPARISON OF NUCLEAR-SPIN RELAXATION RATES AT Y AND O SITES IN YBA2CU3O7-Y SO PHYSICAL REVIEW LETTERS LA English DT Article ID NORMAL STATE; NEUTRON-SCATTERING; NMR; CU; TC; RESONANCE; DYNAMICS; OXIDES; MODEL; PHASE AB We report a detailed comparison of the Y-89 and the planar O-17 NMR shifts K and spin-lattice relaxation rates 1/T1 in oriented YBa2Cu3O7-y powder with y congruent-to 0 and y=0.37. For y=0.37, the ratio R of the O relaxation rate to the Y relaxation rate increases with decreasing temperature above T(c) and T1TK at Y sites is not constant, which suggests that the antiferromagnetic spin correlations between adjacent CuO2 layers grow with decreasing temperature. The magnitude of R in both y=0.37 and y congruent-to 0 is smaller than evaluated from an ionic model of the hyperfine Hamiltonian. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TAKIGAWA, M (reprint author), IBM CORP,THOMAS J WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. NR 23 TC 45 Z9 45 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 OCT 18 PY 1993 VL 71 IS 16 BP 2650 EP 2653 DI 10.1103/PhysRevLett.71.2650 PG 4 WC Physics, Multidisciplinary SC Physics GA MC119 UT WOS:A1993MC11900035 ER PT J AU BERMAN, GP BULGAKOV, EN HOLM, DD TSIFRINOVICH, VI AF BERMAN, GP BULGAKOV, EN HOLM, DD TSIFRINOVICH, VI TI VIOLATION OF THE SEMICLASSICAL APPROXIMATION AND QUANTUM CHAOS IN A PARAMAGNETIC SPIN SYSTEM SO PHYSICS LETTERS A LA English DT Article ID STATES; DYNAMICS; STOCHASTICITY; MECHANICS AB Quantum effects are considered in the dynamics of a system of N paramagnetic atoms in a resonant cavity interacting with a constant magnetic field and with a resonant external magnetic field. In the semi-classical limit (classical radiation field in the cavity) this resonantly driven system shows developed (global) chaos. Expectation-value dynamics shows however that quantum corrections cause a departure from the semi-classical chaotic dynamics on a time-scale tau(h) approximately ln N and that quantum correlation functions grow exponentially in time. The possibility of experimentally observing this effect is discussed. C1 KRASNOYARSK POLYTECH INST,KIRENSKY INST PHYS,RES & EDUC CTR NONLINEAR PROC,KRASNOYARSK 660036,RUSSIA. KRASNYARSK STATE UNIV,DEPT THEORET,KRASNOYARSK 660036,RUSSIA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BERMAN, GP (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 29 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD OCT 18 PY 1993 VL 181 IS 4 BP 296 EP 307 DI 10.1016/0375-9601(93)90611-3 PG 12 WC Physics, Multidisciplinary SC Physics GA MD799 UT WOS:A1993MD79900005 ER PT J AU MILLER, GJ LIN, JH YOUNG, V AF MILLER, GJ LIN, JH YOUNG, V TI STRUCTURE AND BONDING IN [TACL4(C5H5N)2] SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The title structure, tetrachlorobis(pyridine)tantalum, is characterized by monomeric octahedral complexes, TaCl4(py)2 (py is pyridine), with the pyridine ligands coordinated in a trans configuration. In addition to packing (steric) arguments, an electronic driving force for the observed structure is incorporated, which is evaluated using extended Huckel calculations. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP MILLER, GJ (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 14 TC 9 Z9 9 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD OCT 15 PY 1993 VL 49 BP 1770 EP 1773 DI 10.1107/S0108270193003919 PN 10 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA MF448 UT WOS:A1993MF44800025 ER PT J AU GARCIA, JG ENAS, JD FRONCZEK, FR AF GARCIA, JG ENAS, JD FRONCZEK, FR TI STRUCTURE OF A 2-ACYLINDAN-1-ONE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB 2-(1-Hydroxyethylidene)indan-1-one exists as the enol form and is nearly planar with a maximum deviation from the least-squares plane of all non-H atoms of 0.045 (2) angstrom. The molecule has a Z configuration about the enol double bond. The hydroxyl H atom forms an intramolecular hydrogen bond to the carbonyl O atom, having an O ... O distance of 2.610 (2) angstrom and an angle about the H atom of 150 (2)-degrees. The C(=O)-C=C-O torsion angle about the enol double bond has a magnitude of 1.9 (2)-degrees. The C=O and C=C distances are 1.257 (2) and 1.359 (2) angstrom, respectively. C1 LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. RP GARCIA, JG (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 8 TC 7 Z9 7 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD OCT 15 PY 1993 VL 49 BP 1823 EP 1824 DI 10.1107/S0108270193002963 PN 10 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA MF448 UT WOS:A1993MF44800048 ER PT J AU LIU, Z AF LIU, Z TI INCREASED RISK FOR BREAST-CANCER AMONG US FEMALE RADIUM DIAL PAINTERS - A PROPORTIONAL HAZARDS REGRESSION-ANALYSIS SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. NR 0 TC 1 Z9 1 U1 0 U2 1 PU JOHNS HOPKINS UNIV SCHOOL HYGIENE PUB HEALTH PI BALTIMORE PA 111 MARKET PLACE, STE 840, BALTIMORE, MD 21202-6709 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD OCT 15 PY 1993 VL 138 IS 8 BP 599 EP 599 PG 1 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA MH147 UT WOS:A1993MH14700053 ER PT J AU DUPREE, E WATKINS, J INGLE, J WALLACE, P WEST, C TANKERSLEY, W AF DUPREE, E WATKINS, J INGLE, J WALLACE, P WEST, C TANKERSLEY, W TI RISK OF LUNG-CANCER AMONG URANIUM PROCESSING WORKERS SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE INST SCI & EDUC,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV SCHOOL HYGIENE PUB HEALTH PI BALTIMORE PA 111 MARKET PLACE, STE 840, BALTIMORE, MD 21202-6709 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD OCT 15 PY 1993 VL 138 IS 8 BP 640 EP 640 PG 1 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA MH147 UT WOS:A1993MH14700199 ER PT J AU WATSON, CH WRONKA, J LAUKIEN, FH BARSHICK, CM EYLER, JR AF WATSON, CH WRONKA, J LAUKIEN, FH BARSHICK, CM EYLER, JR TI HIGH-MASS RESOLUTION GLOW-DISCHARGE MASS-SPECTROMETRY USING AN EXTERNAL ION-SOURCE FT-ICR MASS-SPECTROMETER SO ANALYTICAL CHEMISTRY LA English DT Article ID CYCLOTRON RESONANCE; SOLIDS AB A glow discharge source has been adapted for use with a commercial external ion source Fourier transform ion cyclotron resonance mass spectrometer. This combination, with improvements in detection limits and accuracy, should be analytically useful for a variety of samples. Results on National Institute of Standards and Technology stainless steel standards showed that peaks due to nominally isobaric atomic isotopes can be observed with high mass resolution (m/DELTAm1/2 greater-than-or-equal-to 290 000). Detection limits in the high parts per billion to low parts per million range were achieved for analysis of trace metals in the standards, and concentrations of the trace elements were determined with good accuracy (average error of 14%). C1 BRUKER INSTRUMENTS INC,MANNING PK,BILLERICA,MA 01821. UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 21 TC 37 Z9 38 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 OCT 15 PY 1993 VL 65 IS 20 BP 2801 EP 2804 DI 10.1021/ac00068a016 PG 4 WC Chemistry, Analytical SC Chemistry GA MC047 UT WOS:A1993MC04700018 ER PT J AU HUANG, TL TSAI, P WU, CT LEE, CS AF HUANG, TL TSAI, P WU, CT LEE, CS TI MECHANISTIC STUDIES OF ELECTROOSMOTIC CONTROL AT THE CAPILLARY SOLUTION INTERFACE SO ANALYTICAL CHEMISTRY LA English DT Article ID EXTERNAL ELECTRIC-FIELD; OXIDE-WATER INTERFACE; ZONE ELECTROPHORESIS; SURFACE-IONIZATION; DOUBLE-LAYER; COMPLEXATION AB The electrokinetic phenomena at the silica-solution interface under the influence of applied radial electric potential gradient were analyzed by a theory based on the Gouy-Chapman-Stern-Grahame (GCSG) model and the induced effect across the capillary wall. The effect of adsorbed ions at the silica-solution interface on the direct control of electroosmosis was studied with the application of lithium ions, tin(IV) ions, and dodecyltrimethylammonium bromide (DTAB). In addition,various organic coatings, including butyl phase, amino phase, and (glycidoxypropyl)trimethoxysilane-ethylene glycol diglycidyl ether (GOX-EGDE), were employed for investigating the effect of surface deactivation on the direct control of electroosmosis. The fundamental relationship between the microenvironment at the silica-solution interface and the direct control of electroosmosis obtained from our experimental and theoretical results is presented and discussed. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,CTR ANALYT INSTRUMENT,AMES,IA 50011. UNIV MARYLAND,DEPT CHEM & BIOCHEM ENGN,CATONSVILLE,MD 21228. NR 22 TC 42 Z9 43 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1993 VL 65 IS 20 BP 2887 EP 2893 DI 10.1021/ac00068a028 PG 7 WC Chemistry, Analytical SC Chemistry GA MC047 UT WOS:A1993MC04700030 ER PT J AU MARTIN, SJ FRYE, GC RICCO, AJ SENTURIA, SD AF MARTIN, SJ FRYE, GC RICCO, AJ SENTURIA, SD TI EFFECT OF SURFACE-ROUGHNESS ON THE RESPONSE OF THICKNESS-SHEAR MODE RESONATORS IN LIQUIDS SO ANALYTICAL CHEMISTRY LA English DT Article ID QUARTZ CRYSTAL MICROBALANCE; ACOUSTIC-WAVE SENSORS; PIEZOELECTRIC-CRYSTALS; PHASE; MASS; GOLD; TRANSMISSION; ELECTRODES; MONOLAYER; FREQUENCY AB The effect of surface microstructure on the response of thickness-shear mode resonators in contact with liquids has been examined. Resonators were fabricated with different degrees of random surface roughness by polishing AT-cut quartz crystals with various abrasive particle sizes and then depositing conformal Cr/Au electrodes. The electrical response of liquid-contacted resonators was measured over a range of frequencies near resonance and fit to an equivalent-circuit model. A method is described for determining the complex shear mechanical impedance (the ratio of shear stress to particle velocity at the solid/liquid interface) from the equivalent-circuit elements. This impedance is sensitive to the influence of surface microstructure on the solid/liquid interaction. The surface mechanical impedance was measured while surface roughness, contacting liquid properties, device operating frequency, and liquid contact angle were varied. Results show that, for roughness features much less than the liquid decay length, the surface may be considered hydrodynamically smooth and the responses depend only on the density-viscosity product. As features become comparable to or larger than the decay length, new mechanisms, including liquid trapping and compressional wave generation, arise for energy storage and power dissipation. Surface treatments that vary the liquid contact angle show no significant effect for liquid coupling by a smooth surface; however, the extent of liquid trapping by a rough surface appears to diminish with increasing liquid contact angle, explaining results previously attributed to the occurrence of slip at the solid/liquid interface. C1 MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. RP MARTIN, SJ (reprint author), SANDIA NATL LABS,DEPT MICROSENSOR RES & DEV,ALBUQUERQUE,NM 87185, USA. RI Ricco, Antonio/A-5273-2010; OI Ricco, Antonio/0000-0002-2355-4984 NR 48 TC 243 Z9 245 U1 2 U2 35 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1993 VL 65 IS 20 BP 2910 EP 2922 DI 10.1021/ac00068a033 PG 13 WC Chemistry, Analytical SC Chemistry GA MC047 UT WOS:A1993MC04700035 ER PT J AU XUE, YJ YEUNG, ES AF XUE, YJ YEUNG, ES TI DOUBLE-BEAM LASER INDIRECT ABSORPTION DETECTION IN CAPILLARY ELECTROPHORESIS SO ANALYTICAL CHEMISTRY LA English DT Article ID INDIRECT PHOTOMETRIC DETECTION; INDIRECT FLUORESCENCE DETECTION; ZONE ELECTROPHORESIS; INORGANIC ANIONS; DETECTION SENSITIVITY; ION ELECTROPHORESIS; OPTIMIZATION; CATIONS AB The use of a laser for optical detection in capillary electrophoresis (CE) allows efficient light coupling. By increasing the absorption path length and by reducing noise through an all-electronic noise canceller, the performance of indirect absorption detection is substantially enhanced. In 75-mum capillaries, as low as 1 X 10(-7) M pyruvate (10(-15) mol injected) can be detected. In 14-mum capillaries, 3 x 10(-6) M (1.5 x 10(-16) mol injected) can be detected. When a cationic chromophore is used, K+ at 1 x 10(-6) M injected is detectable. These represent the best performance to date, by over 1 order of magnitude, for indirect absorption detection in CE without preconcentration. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 27 TC 31 Z9 31 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1993 VL 65 IS 20 BP 2923 EP 2927 DI 10.1021/ac00068a034 PG 5 WC Chemistry, Analytical SC Chemistry GA MC047 UT WOS:A1993MC04700036 ER PT J AU TAYLOR, JA YEUNG, ES AF TAYLOR, JA YEUNG, ES TI IMAGING OF HYDRODYNAMIC AND ELECTROKINETIC FLOW PROFILES IN CAPILLARIES SO ANALYTICAL CHEMISTRY LA English DT Article ID FLUORESCENCE DETECTION; LIQUID-CHROMATOGRAPHY; ZONE ELECTROPHORESIS; VELOCIMETRY; SEPARATIONS; PARTICLES; MEDIA; FLUID AB An imaging system based on microscope optics and a charge-coupled device camera is used to form high-resolution images of the liquid core inside narrow fused-silica capillaries. This technique allows direct examination of the fluid motion inside the capillary under electrokinetic and hydrodynamic (Poiseuille) conditions. Two experiments are described. The first involves monitoring the front of the fluorescence-labeled solvent as it travels through the capillary. The second is an examination of the local velocities using submicron-sized particles as probes. The results are discussed in context of band broadening in capillary electrophoresis. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 22 TC 79 Z9 80 U1 5 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1993 VL 65 IS 20 BP 2928 EP 2932 DI 10.1021/ac00068a035 PG 5 WC Chemistry, Analytical SC Chemistry GA MC047 UT WOS:A1993MC04700037 ER PT J AU CHANG, HT YEUNG, ES AF CHANG, HT YEUNG, ES TI ON-COLUMN DIGESTION OF PROTEIN FOR PEPTIDE-MAPPING BY CAPILLARY ZONE ELECTROPHORESIS WITH LASER-INDUCED NATIVE FLUORESCENCE DETECTION SO ANALYTICAL CHEMISTRY LA English DT Note ID PERFORMANCE LIQUID-CHROMATOGRAPHY; INDIRECT FLUOROMETRIC DETECTION; TRYPTIC DIGESTS; SEPARATION; FRAGMENTS; TRYPSIN; SAMPLES; BUFFERS; ACID C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RI Chang, Huan-Tsung/C-1183-2011; OI Chang, Huan-Tsung/0000-0002-5393-1410 NR 38 TC 62 Z9 65 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1993 VL 65 IS 20 BP 2947 EP 2951 DI 10.1021/ac00068a040 PG 5 WC Chemistry, Analytical SC Chemistry GA MC047 UT WOS:A1993MC04700042 ER PT J AU CHRISTENSEN, KM BAKAC, A ESPENSON, JH AF CHRISTENSEN, KM BAKAC, A ESPENSON, JH TI QUENCHING OF THE EXCITED-STATE OF HYDRATED EUROPIUM (III) IONS BY ELECTRON-TRANSFER SO CHEMICAL PHYSICS LA English DT Article ID COMPLEXES; MECHANISM; KINETICS AB The quenching of *Eu(aq)3+ by several metal complexes and organic compounds takes place by electron transfer. The reactions are rather slow and only the most powerful reductants quench *Eu(aq)3+ effectively. The most reactive quenchers were Ru(NH3)62+, Fe(C5Me5)2, and Fe(C5H5)2. It was observed that Eu2+ and Cr2+ have similar reactivity with *Eu3+. Quenching with N,N,N',N'-tetramethyl-1,4-phenylenediamine (TMPD) and N,N'-diphenyl-1,4-phenylenediamine (DPPD) yields the strongly absorbing radicals TMPD+. and DPPD+., thus providing direct evidence for electron transfer. The slow rates of the *Eu3+ reactions imply that the electron-exchange rate constant for *Eu(aq)3+/Eu(aq)2+ is small, like that for the ground-state couple. The energy transfer quenching by metal ion complexes is also inefficient, as demonstrated by the lack of reactivity of non-reducing Mn2+ and Co(NH3)63+ complexes. Eu3+ in the ground state reacts effectively with excited state biacetyl by energy transfer to form *Eu3+. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 16 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD OCT 15 PY 1993 VL 176 IS 2-3 BP 359 EP 365 DI 10.1016/0301-0104(93)80246-6 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB797 UT WOS:A1993MB79700006 ER PT J AU CURTISS, LA NALEWAY, CA MILLER, JR AF CURTISS, LA NALEWAY, CA MILLER, JR TI SUPEREXCHANGE PATHWAY CALCULATION OF LONG-DISTANCE ELECTRONIC COUPLING IN H2C(CH2)M-2CH2 CHAINS SO CHEMICAL PHYSICS LA English DT Article ID THROUGH-BOND INTERACTION; DONOR-ACCEPTOR SYSTEMS; CHARGE-TRANSFER ABSORPTION; TRANSFER MATRIX-ELEMENTS; ORBITAL INTERACTIONS; REDOX PAIRS; DEPENDENCE; MOLECULES; BRIDGES; SPACE AB In a recent communication (C.A. Naleway, L.A. Curtiss and J.R. Miller, J. Phys. Chem. 95 (1991) 8434) we outlined a method for calculation and analysis of long-distance couplings in electron transfer reactions making use of McConnell's superexchange formalism with matrix elements from ab initio molecular orbital wave functions transformed to localized bond orbitals using Weinhold's natural bond orbital method. In this paper we present a detailed investigation into several aspects of the superexchange (SE) pathways method for calculation of anion and cation pi couplings in H2C(CH2)m-2CH2, m=4-8, trans alkyls. The convergence of the couplings calculated from this method is examined as a function of energy threshold. Good convergence is found for wave functions (neutral triplet beta, dication) for which paths through unoccupied orbitals dominate paths through occupied orbitals; convergence is not as good for wave functions (neutral triplet a, anion) for which occupied paths are dominant. Reasons for these results are explored. The couplings calculated from the SE method are in reasonable agreement with Koopman's theorem when convergence of the couplings with threshold is attained and the 3-2 1 G basis set did well compared to larger basis sets. In agreement with previous studies, pathways with hops over bonds make up the bulk of the interaction and most of these involve CC bonds or CC* antibonds. The SE pathways calculations, some of which included more than 10 million different paths, indicate that contributions from long paths tend to cancel so that the shorter paths (2-5 jumps) are largely responsible for determining the magnitude of the coupling. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 72 TC 67 Z9 67 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 OCT 15 PY 1993 VL 176 IS 2-3 BP 387 EP 405 DI 10.1016/0301-0104(93)80249-9 PG 19 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB797 UT WOS:A1993MB79700009 ER PT J AU WANG, ZY PEARLSTEIN, RM JIA, YW FLEMING, GR NORRIS, JR AF WANG, ZY PEARLSTEIN, RM JIA, YW FLEMING, GR NORRIS, JR TI INHOMOGENEOUS ELECTRON-TRANSFER KINETICS IN REACTION CENTERS OF BACTERIAL PHOTOSYNTHESIS SO CHEMICAL PHYSICS LA English DT Article ID BIOLOGICAL MOLECULES; CHARGE SEPARATION; TEMPERATURE; SPECTROSCOPY; DEPENDENCE; PROTEIN; ENERGY AB Based on the idea of conformational substates in proteins, we have analyzed the non-single exponential kinetics of an electron transfer system in terms of inhomogeneous width and thermal-energy fluctuation. A simple theoretical expression for the average lifetime for electron transfer has been derived together with the concept of ''apparent'' reorganization energy. These expressions provide insight into the efficiency of primary charge separation in the bacterial photosynthetic reaction center. C1 INDIANA UNIV PURDUE UNIV,DEPT PHYS,INDIANAPOLIS,IN 46202. UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. RP WANG, ZY (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 27 TC 53 Z9 54 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD OCT 15 PY 1993 VL 176 IS 2-3 BP 421 EP 425 DI 10.1016/0301-0104(93)80251-4 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB797 UT WOS:A1993MB79700011 ER PT J AU OGAWA, MY MOREIRA, I WISHART, JF ISIED, SS AF OGAWA, MY MOREIRA, I WISHART, JF ISIED, SS TI LONG-RANGE ELECTRON-TRANSFER IN HELICAL POLYPROLINE-II OLIGOPEPTIDES SO CHEMICAL PHYSICS LA English DT Article ID DISTANCE DEPENDENCE; POLYPEPTIDE-CHAIN; PULSE-RADIOLYSIS; TRANSFER RATES; AMINO-ACIDS; PEPTIDE FORMATION; BRIDGING LIGANDS; TRYPTOPHAN; COMPLEXES; TYROSINE AB A series of binuclear donor-acceptor complexes with helical polyproline bridges [ (bpy)2Ru(II)L-(Pro)n-apy-Ru(III)(NH3)5]5+ n=6, 7, 9, where L=4-carboxy-4'-methyl-2,2'-bipyridine, bpy=4,4'-bipyridine, and apy=4-aminopyridine, were synthesized and characterized by absorption spectra, electrochemistry and HPLC. The CD spectra of the complexes confirm that they exist in the helical polyproline II structure. Intramolecular electron transfer within these complexes was studied by generating the [ (bpy)2Ru(I)L.-(Pro)n-apy-Ru(III)(NH3)5] intermediate from the reaction of e(aq) (from pulse radiolysis) with the [ (bpy)2Ru(II)L-(Pro)n-apy-Ru(III)(NH3)5] species in aqueous solution. The driving force for this reaction is estimated to be \DELTAG0\ almost-equal-to 1.5 V. The rates (k, 25-degrees-C) and activation parameters (DELTAH(double dagger) (kcal/mol), DELTAS(double dagger) (eu) ) for the intramolecular electron transfer were found to be: 1.08 X 1O(5) s-1, 5.6, - 17; 6.40 x 1O(4) s-1, 5.1, - 19; 1.91 X 10(4) s-1, 4.0, and -26 for n=6, 7, 9 respectively. The rate (k, 25-degrees-C) and activation parameters (DELTAH(double dagger) (kcal/mol), DELTAS(double dagger) (eu)) for the intermolecular reaction between [(bpy)2Ru(I)L.] and [(NH3)5Ru(III)-apy-Pro] were found to be 2.l x 10(9) M-1 s-1, 3.3 and -5. This series extends our studies of the distance dependence of rate versus the number of helical prolines bridging a donor and acceptor ruthenium site to a metal-to-metal distance almost-equal-to 40 angstrom. The weak dependence of rate versus the number of prolines observed for n = 6, 7, and 9 is very similar to that observed earlier for [ (bpy)2Ru(II)L-(Pro)n-Co(III)(NH3)5], n=4-6. The rapid rates observed at these long distances show that long range electron transfer can be observed between an appropriate donor and acceptor directly connected to the proline bridge via peptide bonds at distances similar to the diameter of a small protein. C1 RUTGERS UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08903. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 47 TC 53 Z9 53 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD OCT 15 PY 1993 VL 176 IS 2-3 BP 589 EP 600 DI 10.1016/0301-0104(93)80263-9 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB797 UT WOS:A1993MB79700023 ER PT J AU WIEDERRECHT, GP WATANABE, S WASIELEWSKI, MR AF WIEDERRECHT, GP WATANABE, S WASIELEWSKI, MR TI SOLVENT EFFECTS ON THE ENERGETICS AND DYNAMICS OF ULTRAFAST ELECTRON-TRANSFER IN CHLOROPHYLL-PORPHYRIN-ACCEPTOR TRIADS SO CHEMICAL PHYSICS LA English DT Article ID PRIMARY CHARGE SEPARATION; RHODOPSEUDOMONAS-SPHAEROIDES R-26; PHOTOSYNTHETIC REACTION CENTER; BACTERIAL PHOTOSYNTHESIS; FEMTOSECOND SPECTROSCOPY; DIELECTRIC FRICTION; ZINC PORPHYRIN; EXCITED-STATES; ANION RADICALS; DEPENDENCE AB The photochemistry and electron transfer kinetics of two fixed distance and fixed orientation triad systems are studied. The two molecules are a zinc-chlorophyll-zinc-porphyrin-naphthoquinone (ZCZPNQ) system and a zinc-chlorophyll-zinc-por-phyrin-3,4,9,10-perylenetetracarboxydiimide (ZCZPPER) system. Optical excitation of ZC with a 190 fs pulse at 585 nm results in charge transfer and the formation of ZC+ZPNQ- (PER-). The chromophores are chosen to minimize spectral overlap of the radical ion products, so that the analysis of the kinetic data is unambiguous. The kinetics of charge transfer are monitored by ultrafast pump-probe spectroscopy, and the role that the central porphyrin plays in mediating electron transfer is discussed. We find that solvent relaxation also plays a role in determining the rates of both charge separation and recombination in polar solvents. Differing mechanisms for solvent relaxation are discussed. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 75 TC 27 Z9 27 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 EI 1873-4421 J9 CHEM PHYS JI Chem. Phys. PD OCT 15 PY 1993 VL 176 IS 2-3 BP 601 EP 614 DI 10.1016/0301-0104(93)80264-A PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB797 UT WOS:A1993MB79700024 ER PT J AU DANG, LX AF DANG, LX TI SOLVATION OF AMMONIUM ION - A MOLECULAR-DYNAMICS SIMULATION WITH NONADDITIVE POTENTIALS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID POLARIZABLE WATER AB Detailed solvation properties of an ammonium ion in polarizable water as a function of the number of water molecules are studied. Extensive molecular dynamics simulations are carried out to compute successive binding enthalpies of the ionic clusters, solvation enthalpies, and structural properties of aqueous ionic solutions. The results of these simulations indicate that water molecules in the first hydration shell are tetrahedrally coordinated to the ammonium ion. The distribution of the static orientation of water dipole moments is calculated and found to be rather broad when compared to corresponding results obtained for simulations that use spherical cations. RP DANG, LX (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 18 TC 11 Z9 11 U1 0 U2 5 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 OCT 15 PY 1993 VL 213 IS 5-6 BP 541 EP 546 DI 10.1016/0009-2614(93)89157-D PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB417 UT WOS:A1993MB41700020 ER PT J AU SEGEV, A GUNADHI, H CHANDRA, R SHANTHIKUMAR, JG AF SEGEV, A GUNADHI, H CHANDRA, R SHANTHIKUMAR, JG TI SELECTIVITY ESTIMATION OF TEMPORAL DATA MANIPULATIONS SO INFORMATION SCIENCES LA English DT Article ID LANGUAGE AB Temporal relations possess several characteristics that distinguish them from conventional snapshot relations. First, for each instance of the surrogate (entity) there is a set of time-ordered tuples. Second, surrogate instances may arrive and depart in some time-dependent manner. Third, the surrogate instance may arrive and depart more than once, thus creating gaps (null values) within its history. Lastly, the value of the temporal attribute may also be time-dependent. Conventional methods of estimation are incapable of providing good approximations of the cost of various temporal operations, even for those involving selections on a single relation. The problem is more acute in the case of join operations, because selectivities on time interval intersections have to be estimated. We propose a practical, yet theoretically sound model to characterize the changes of temporal relations. From this model, estimates of the cardinalities of various unary and binary operations are derived. Simulation results show that the proposed estimates are both robust and superior to conventional estimates. C1 LAWRENCE BERKELEY LAB,DIV INFORMAT & COMP SCI,BERKELEY,CA 94720. RP SEGEV, A (reprint author), LAWRENCE BERKELEY LAB,WALTER A HAAS SCH BUSINESS,BERKELEY,CA 94720, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0020-0255 J9 INFORM SCIENCES JI Inf. Sci. PD OCT 15 PY 1993 VL 74 IS 1-2 BP 111 EP 149 DI 10.1016/0020-0255(93)90130-E PG 39 WC Computer Science, Information Systems SC Computer Science GA LZ835 UT WOS:A1993LZ83500006 ER PT J AU REEDY, ED GUESS, TR AF REEDY, ED GUESS, TR TI COMPOSITE-TO-METAL TUBULAR LAP JOINTS - STRENGTH AND FATIGUE RESISTANCE SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article ID TORSION; OPTIMIZATION AB The axial strength and fatigue resistance of thick-walled, adhesively bonded E-glass composite-to-aluminum tubular lap joints have been measured for tensile and compressive loadings. The joint specimen bonds a 63 mm OD aluminium tube within each end of a 300 mm long, 6 mm thick E-glass/epoxy tube. Untapered, 12.5 mm thick aluminium adherends were used in all but four of the joint specimens. The aluminum adherends in the remaining four specimens were tapered to a thickness of 1 mm at the inner bond end (the bond end where the aluminum adherend terminates). For all loadings, joint failure initiates at the inner bond end as a crack grows in the adhesive adjacent to the interface. Test results for a tension-tension fatigue loading indicate that fatigue can severely degrade joint performance. Interestingly, measured tensile strength and fatigue resistance for joints with untapered adherends is substantially greater than compressive strength and fatigue resistance. The joint specimen has been analyzed in two different ways: one approach models the adhesive as an uncracked, elastic-perfectly plastic material, while the other approach uses a linear elastic fracture mechanics methodology. Results for the uncracked, elastic-plastic adhesive model indicate that observed bond failure occurs in the region of highest calculated stresses, extensive bond yielding occurs at load levels well below that required to fail the joint, and a tensile peel stress is generated by a compressive joint loading when the aluminum adherends are untapered. This latter result is consistent with the observed joint tensile-compressive strength differential. Results of the linear elastic fracture mechanics analysis of a joint with untapered aluminum adherends are also consistent with the observed differential strength effect since a mode I crack loading is predicted for a compressive joint loading. Calculations and a limited number of tests suggest that it may be possible to selectively control the differential strength effect by tapering the aluminum adherends. The effect of adherend material and thickness on fracture mechanics parameters is also investigated. The paper concludes by examining the applicability of linear elastic fracture mechanics to the joints tested. RP REEDY, ED (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 16 Z9 16 U1 0 U2 7 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 OCT 15 PY 1993 VL 63 IS 4 BP 351 EP 367 DI 10.1007/BF00013043 PG 17 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA MR903 UT WOS:A1993MR90300004 ER PT J AU WANG, CB SESSLER, AM AF WANG, CB SESSLER, AM TI AN EFFICIENT MICROWAVE-POWER SOURCE - THE FREE-ELECTRON LASER AFTERBURNER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID 2-BEAM ACCELERATOR; OPTICAL KLYSTRON; FEL AB A kind of microwave power source, called a free-electron laser (FEL) afterburner, that consists of a free-electron laser buncher and a slow-wave output structure sharing a magnetic wiggler field with the buncher is proposed. The buncher and the slow-wave structure can operate in either a traveling-wave state or a standing-wave state. In the buncher, the wiggler field together with the radiation field makes an electron beam bunched, and in the slow-wave structure the wiggler field keeps the beam bunched while the bunched beam interacts strongly with the slow-wave structure and thus produces rf power. The bunching process comes from the free-electron laser mechanism, and the generating process of rf power is in a slow-wave structure. A three-dimensional, time-dependent code is used to simulate a particular standing-wave FEL afterburner and it is shown that rf power of up to 1.4 GW at 17.12 GHz, can be obtained from a 1 kA, 5 MeV electron beam with an energy spread of less than 1 % and an emittance of less than 0.5 X 10(-3) pi rad m. C1 UNIV ELECTR SCI & TECHNOL CHINA,INST HIGH ENERGY ELECTR RES,SICHUAN 610054,PEOPLES R CHINA. RP WANG, CB (reprint author), LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720, USA. OI Wang, Changbiao/0000-0001-7891-7079 NR 16 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1993 VL 74 IS 8 BP 4840 EP 4844 DI 10.1063/1.354312 PG 5 WC Physics, Applied SC Physics GA MC030 UT WOS:A1993MC03000004 ER PT J AU MAO, XL CHAN, WT SHANNON, MA RUSSO, RE AF MAO, XL CHAN, WT SHANNON, MA RUSSO, RE TI PLASMA SHIELDING DURING PICOSECOND LASER SAMPLING OF SOLID MATERIALS BY ABLATION IN HE VERSUS AR ATMOSPHERE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDUCTIVELY COUPLED PLASMA; ATOMIC-EMISSION-SPECTROMETRY; SUPERCONDUCTING THIN-FILMS; PULSE; MICROFABRICATION; VAPORIZATION; DEPOSITION AB The influence of plasma shielding on the coupling of laser energy to a target surface during picosecond pulsed laser-material interactions is demonstrated using a He and Ar gas atmosphere. An inductively coupled plasma-atomic emission spectrometer (ICP-AES) is used to monitor the quantity of copper material removed during picosecond and nanosecond pulsed-laser sampling. The intensity of Cu I emission from the ICP-AES was found to be 16.4 times larger with He as the gas medium compared to Ar during picosecond laser sampling. It was also observed that depth of craters in the copper targets decreased as the gas pressure was increased beyond 10 Torr in Ar and 100 Torr in He. Possible mechanisms of shock waves, multiphoton ionization, and plasma shielding to explain these observations are discussed. For plasma shielding to occur in the picosecond time regime, the existence of high-energy photoelectrons emitted from a Cu sample during the leading edge of laser pulse is postulated. These electrons form a plasma in the gas above the target via an inverse bremsstrahlung process and the plasma absorbs part of laser energy. The electron density versus pressure was calculated from a simple model and found to have similar behavior as the crater-depth data. C1 LAWRENCE BERKELEY LAB,MS 90-2024,BERKELEY,CA 94720. NR 37 TC 66 Z9 66 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1993 VL 74 IS 8 BP 4915 EP 4922 DI 10.1063/1.354325 PG 8 WC Physics, Applied SC Physics GA MC030 UT WOS:A1993MC03000017 ER PT J AU MILLER, SL FLEETWOOD, DM MCWHORTER, PJ REBER, RA MURRAY, JR AF MILLER, SL FLEETWOOD, DM MCWHORTER, PJ REBER, RA MURRAY, JR TI A GENERAL CENTROID DETERMINATION METHODOLOGY, WITH APPLICATION TO MULTILAYER DIELECTRIC STRUCTURES AND THERMALLY STIMULATED CURRENT MEASUREMENTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID NONVOLATILE MEMORY TRANSISTORS; IRRADIATED MOS DEVICES; INTERFACE TRAPS; SI3N4 FILMS; THIN-FILMS; CHARGE; ELECTRON; DISTRIBUTIONS; ENVIRONMENT; INSULATORS AB A general methodology is developed to experimentally characterize the spatial distribution of occupied traps in dielectric films on a semiconductor. The effects of parasitics such as leakage, charge transport through more than one interface, and interface trap charge are quantitatively addressed. Charge transport with contributions from multiple charge species is rigorously treated. The methodology is independent of the charge transport mechanism(s), and is directly applicable to multilayer dielectric structures. The centroid capacitance, rather than the centroid itself, is introduced as the fundamental quantity that permits the generic analysis of multilayer structures. In particular, the form of many equations describing stacked dielectric structures becomes independent of the number of layers comprising the stack if they are expressed in terms of the centroid capacitance and/or the flatband voltage. The experimental methodology is illustrated with an application using thermally stimulated current (TSC) measurements. The centroid of changes (via thermal emission) in the amount of trapped charge was determined for two different samples of a triple-layer dielectric structure. A direct consequence of the TSC analyses is the rigorous proof that changes in interface trap charge can contribute, though typically not significantly, to thermally stimulated current. RP MILLER, SL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 40 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1993 VL 74 IS 8 BP 5068 EP 5077 DI 10.1063/1.354291 PG 10 WC Physics, Applied SC Physics GA MC030 UT WOS:A1993MC03000041 ER PT J AU SMITH, HJT BLACKBURN, JA GRONBECHJENSEN, N AF SMITH, HJT BLACKBURN, JA GRONBECHJENSEN, N TI DYNAMICAL PROPERTIES OF JOSEPHSON-JUNCTIONS COUPLED BY A TRANSMISSION-LINE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ARRAYS AB A system composed of two Josephson junctions connected by a transmission line has been studied by means of electronic analog simulation. Under external current bias, the resistive component of the coupling induces frequency locking between the two junctions at commensurate ratios. The resonant modes of the transmission line give rise to steps in the I-V characteristics of the system. C1 WILFRID LAURIER UNIV,DEPT PHYS & COMP,WATERLOO N2L 3C5,ONTARIO,CANADA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SMITH, HJT (reprint author), UNIV WATERLOO,DEPT PHYS,WATERLOO N2L 3G1,ONTARIO,CANADA. NR 16 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1993 VL 74 IS 8 BP 5101 EP 5107 DI 10.1063/1.354296 PG 7 WC Physics, Applied SC Physics GA MC030 UT WOS:A1993MC03000046 ER PT J AU GOLDFIELD, EM GRAY, SK HARDING, LB AF GOLDFIELD, EM GRAY, SK HARDING, LB TI QUANTUM DYNAMICS OF RENNER-TELLER VIBRONIC COUPLING - THE PREDISSOCIATION OF HCO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LASER-INDUCED FLUORESCENCE; 3-DIMENSIONAL WAVE PACKET; REACTIVE SCATTERING; MOLECULAR-DYNAMICS; TRIATOMIC-MOLECULES; VARIATIONAL METHOD; ELECTRONIC STATES; DISSOCIATION; SURFACES; PHOTOFRAGMENTATION AB A Hamiltonian model and parity-adapted wave packet representation are developed to describe a rotating triatomic system with two Renner-Teller coupled potential surfaces, and HCO predissociation is studied. New configuration interaction calculations on HCO are performed to determine its excited A(2A'') potential surface, and Bowman, Bittman. and Harding's X(2A') ground potential surface is employed. The properties of many resonances, correlating with stretch/bend excitations on the A'' surface, are determined. Resonance energies and decay constants are in good agreement with experimental results of Houston and.co-workers, but CO rotational product distributions tend to be hotter and narrower than experiment, particularly for pure bend excitations. Wave packet dynamics involves growth of amplitude on the A' surface near collinear geometries via Renner-Teller coupling, and subsequent adiabatic evolution to determine product distributions. The wave packets probe a previously untested part of the A' surface, and point to the need for improvements of this surface. C1 ARGONNE NATL LAB, DIV CHEM, THEORET CHEM GRP, ARGONNE, IL 60439 USA. UNIV COLORADO, JOINT INST LAB ASTROPHYS, BOULDER, CO 80309 USA. NATL INST STAND & TECHNOL, BOULDER, CO 80309 USA. RP GOLDFIELD, EM (reprint author), CORNELL UNIV, CORNELL THEORY CTR, ITHACA, NY 14853 USA. NR 60 TC 56 Z9 56 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1993 VL 99 IS 8 BP 5812 EP 5827 DI 10.1063/1.465933 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB564 UT WOS:A1993MB56400023 ER PT J AU TANG, J AF TANG, J TI THE EFFECTS OF QUANTUM MODES ON THE ENERGY-GAP LAW FOR ELECTRON-TRANSFER REACTIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID BIOLOGICAL MOLECULES; POLAR-SOLVENTS; DYNAMICS AB The effects of quantum modes on the free energy relationship for electron-transfer reactions formulated by the ''spin-boson'' model are examined. The modified energy gap law for exothermic electron transfer reactions with quantum modes is derived in a simple analytical form, using the method of steepest descent to avoid the usual multiple convolution integrals. RP TANG, J (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RI Tang, Jau/D-8382-2012 OI Tang, Jau/0000-0003-2078-1513 NR 21 TC 18 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1993 VL 99 IS 8 BP 5828 EP 5830 DI 10.1063/1.465934 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB564 UT WOS:A1993MB56400024 ER PT J AU PARKS, EK KLOTS, TD WINTER, BJ RILEY, SJ AF PARKS, EK KLOTS, TD WINTER, BJ RILEY, SJ TI REACTIONS OF COBALT CLUSTERS WITH WATER AND AMMONIA - IMPLICATIONS FOR CLUSTER STRUCTURE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSITION-METAL CLUSTERS; NICKEL CLUSTERS; ICOSAHEDRAL STRUCTURE; HYDROGENATED COBALT; GEOMETRIC STRUCTURE; CHEMISORPTION; CHEMISTRY; PROBES; IRON; NIN AB Reactions of cobalt clusters in the 6 to 150 atom size range with water and ammonia are used to probe cluster geometrical structure. Clusters saturated with ammonia are found in several isomeric forms in much of this size region, including a structure based on icosahedral packing for clusters having 50 to 120 atoms. The variations with cluster size of the binding energy for a single water molecule provide evidence for icosahedral structure of the bare cobalt clusters in the same size range seen for the ammoniated clusters. However, both probes suggest that in many cases the bare clusters also have multiple isomers. The evidence for icosahedral structure in the bare and ammoniated clusters disappears above approximately 120 atoms and is clearly not seen at the third icosahedral shell closing at 147 atoms. Comparison with earlier studies of hydrogenated cobalt clusters and with bare and hydrogenated nickel clusters is made. Reasons for the failure to form the closed-shell 147 atom icosahedral cluster are discussed. RP PARKS, EK (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RI Winter, Bernd/D-4657-2011 NR 31 TC 48 Z9 48 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1993 VL 99 IS 8 BP 5831 EP 5839 DI 10.1063/1.465935 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB564 UT WOS:A1993MB56400025 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI DETERMINATION OF CONSECUTIVE BOND-ENERGIES BY PHOTOIONIZATION OF SBHN(N=1-3) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID THEORETICAL THERMOCHEMISTRY; ABINITIO CALCULATIONS; IONIZATION ENERGIES; LASER SPECTROSCOPY; FUNDAMENTAL-BAND; HEATS; SPECTRA; SINGLET; NH2+; BIH AB A photoionization mass spectrometric study of SbH3 is presented. The adiabatic ionization potential (IP) of SbH3 is less-than-or-equal-to 9.40+/-0.02 eV. The lowest energy fragment ion, SbH+ (+H-2), has an appearance potential (0 K) of 9.73(0)+/-0.08 eV, while SbH2+ has an AP of 11.66+/-0.02 eV. The transient species SbH2 and SbH are generated in situ by reacting F atoms with SbH3. The IP of SbH2, forming SbH2+ (X1A1), is 8.731+/-0.012 eV. The IP of SbH (X3SIGMA-,0+) to form SbH+ (X2PI1/2) is probably 8.753+/-0.009 eV, but certainly < 8.79 eV. Autoionizing structure in the photoion yield curve of SbH + (SbH) is interpreted as Rydberg series converging to SbH+ (a 4SIGMA-), which appears to be split into 1/2 and 3/2 components, with IP's of 10.843+/-0.011 eV and 10.866+/-0.01 1 eV. The difference in IP's (Sb-SbH, SbH-SbH2) appears to conform to the extended Goddard-Harding model, when adjusted for spin-orbit splittings. The derived heats of formation are DELTAH(f0)0(SbH) = 59.1+/-0.3 kcal/mol and DELTAH(f0)0(SbH2) = 52.5+/-0.6 kcal/mol. These values lead to D0(SbH) = 56.4+/-1.0, D0(HSb-H) = 58.3+/-0.6, D0(H2Sb-H) = 67.5+/-0.5 (in kcal/mol). The differences in successive bond energies, 1.9+/-1.2 and 9.2+/-0.8 kcal/mol, depart significantly from the constant value (4.44 kcal/mol) predicted by the Goddard-Harding model. A rationalization is presented, that incorporates relativistic effects. This relativistic picture implies that for BiH(n), D0(BiH) > D0(HBi-H), a conclusion for which some experimental evidence exists. However, relativistic ab initio calculations, which agree rather well in their calculated differences in successive bond energies for SbH(n), do not predict this reversal in BiH(n). RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 36 TC 1 Z9 1 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 OCT 15 PY 1993 VL 99 IS 8 BP 5840 EP 5848 DI 10.1063/1.465937 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB564 UT WOS:A1993MB56400026 ER PT J AU PARKS, EK RILEY, SJ AF PARKS, EK RILEY, SJ TI MODELING ADSORBATE UPTAKE - COVERAGE DEPENDENCE OF THE IRON CLUSTER-AMMONIA BINDING-ENERGY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NICKEL CLUSTERS; IONIZATION-POTENTIALS; METAL-CLUSTERS; ADSORPTION; SURFACES; NI(111) AB Experimental data on the uptake of ammonia by iron clusters in the polyicosahedral series Fe19, Fe23, Fe26, Fe29, Fe32, and Fe34 have been measured at a series of temperatures. The uptake data are analyzed with a statistical model that parametrizes both molecular adsorption and desorption in terms of collision cross sections, Rice-Ramsperger-Kassel (RRK) frequency factors, and cluster-ammonia binding energies. Fits to the data give a binding energy of 0.88 +/- 0.02 eV for the first NH3 molecule on all six clusters, and a linear decrease in binding energy with increasing number pf molecules, with larger clusters showing a slower rate of decrease. When expressed as a function of coverage (the ratio of the number of molecules to the number of surface metal atoms), the binding energy is also linear and is essentially independent of cluster size. The observed behavior is discussed in terms of the probable nature of cluster-ammonia interactions. RP PARKS, EK (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 20 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1993 VL 99 IS 8 BP 5898 EP 5904 DI 10.1063/1.465942 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB564 UT WOS:A1993MB56400031 ER PT J AU MCGREGOR, DA YEUNG, ES AF MCGREGOR, DA YEUNG, ES TI OPTIMIZATION OF CAPILLARY ELECTROPHORETIC SEPARATION OF DNA FRAGMENTS BASED ON POLYMER FILLED CAPILLARIES SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 5TH International Symposium on High Performance Capillary Electrophoresis (HPCE 93) CY JAN 25-28, 1993 CL ORLANDO, FL ID GEL-ELECTROPHORESIS; RESTRICTION FRAGMENTS; ZONE ELECTROPHORESIS; AGAROSE SOLUTIONS; REACTION-PRODUCTS; SIZE SEPARATIONS; OLIGONUCLEOTIDES; RESOLUTION; LENGTH AB The separation of Phi X174RF DNA-Hae III fragments is studied in a 0.5% methycellulose polymer solution as a function of temperature and applied voltage. The migration times decreased with both increasing temperature and increasing field strength, as expected. However, the relative migration rates of the fragments (selectivity) did not change with temperature but are affected by the applied field. A clear transition from the Ogston mechanism to the reptation mechanism is observed. The use of 0.5% methyl cellulose and 202 mM berate buffer at pH 8.2 allows the separation of the 271/281 base pair fragments, even without the addition in intercalating agents. At 700 V/cm and 20 degrees C, complete separation of all fragments is achieved in less than 4 min with an average plate number of 2.5 . 10(6)/m. C1 IOWA STATE UNIV,AMES LAB,US DOE,AMES,IA 50011. IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. NR 23 TC 44 Z9 44 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD OCT 15 PY 1993 VL 652 IS 1 BP 67 EP 73 DI 10.1016/0021-9673(93)80646-P PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA MW219 UT WOS:A1993MW21900009 ER PT J AU DOSE, EV GUIOCHON, G AF DOSE, EV GUIOCHON, G TI TIMESCALES OF TRANSIENT PROCESSES IN CAPILLARY ELECTROPHORESIS SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 5TH International Symposium on High Performance Capillary Electrophoresis (HPCE 93) CY JAN 25-28, 1993 CL ORLANDO, FL ID ANALYTE VELOCITY MODULATION; OPEN-TUBULAR CAPILLARY; UNSTEADY HEAT-TRANSFER; ZONE ELECTROPHORESIS; TEMPERATURE-GRADIENTS; ELECTROKINETIC CHROMATOGRAPHY; LIQUID-CHROMATOGRAPHY; ELECTROOSMOTIC FLOW; COLUMN TEMPERATURE; THERMAL THEORY AB We apply numerical simulation based on fundamental physical properties to the study of the development of electroosmotic flow and thermal gradient formation that occur immediately after a potential is applied to a capillary filled with electrolyte. Electroosmotic flow requires a few hundred microseconds to develop. We confirm others' findings that radial thermal gradients are generally too small to dominate zone dispersion for capillaries with lumen diameters smaller than about 100 mu m. The radial thermal gradient within the capillary lumen requires a few milliseconds to develop, but the general, whole-capillary temperature rise requires ten to a thousand times longer. We combine on one scale the major time-dependent processes that occur when an axial potential gradient is applied, and we demonstrate the theoretical feasibility of using modulated driving potentials to suppress thermal zone broadening. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 43 TC 37 Z9 39 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD OCT 15 PY 1993 VL 652 IS 1 BP 263 EP 275 DI 10.1016/0021-9673(93)80668-X PG 13 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA MW219 UT WOS:A1993MW21900031 ER PT J AU MACLEOD, CA RADKE, CJ AF MACLEOD, CA RADKE, CJ TI A GROWING DROP TECHNIQUE FOR MEASURING DYNAMIC INTERFACIAL-TENSION SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID BUBBLE-PRESSURE METHOD; SURFACE-TENSION; NONIONIC SURFACTANTS; ADSORPTION-KINETICS C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. NR 46 TC 119 Z9 121 U1 2 U2 10 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD OCT 15 PY 1993 VL 160 IS 2 BP 435 EP 448 DI 10.1006/jcis.1993.1415 PG 14 WC Chemistry, Physical SC Chemistry GA MA314 UT WOS:A1993MA31400020 ER PT J AU MCBREEN, J AF MCBREEN, J TI EXAFS STUDIES OF ADSORBED COPPER ON CARBON-SUPPORTED PLATINUM SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID X-RAY-ABSORPTION; DEPOSITED COPPER; SPECTROSCOPY; ADSORPTION; ELECTRODES; MONOLAYER; IONS AB In situ extended X-ray absorption fine structure (EXAFS) studies were done on adsorbed copper on carbon-supported platinum in 0.5 M H2SO4 + 2 x 10(-3) M Cu++ at 0.05 V SCE. Data analysis of the nearest coordination shells around the copper is consistent with Cu adsorption on Pt on the on-top position with a Cu-Pt bond length of 2.67 angstrom. The results indicate that copper is also coordinated with three oxygens at a distance of 2.06 angstrom and one sulfur at a distance of 2.37 angstrom. This indicates co-adsorption of bisulfate ions. The bisulfate is probably adsorbed on top of the copper where it facilitates charge transfer from the copper to the platinum and yields the adsorbed Cu+ species that have been observed in X-ray absorption near-edge spectroscopy studies. RP MCBREEN, J (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 23 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 15 PY 1993 VL 357 IS 1-2 BP 373 EP 386 DI 10.1016/0022-0728(93)80392-U PG 14 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA MC269 UT WOS:A1993MC26900021 ER PT J AU ASSINK, RA DESHPANDE, R SMITH, DM AF ASSINK, RA DESHPANDE, R SMITH, DM TI THE EFFECT OF MOLECULAR-OXYGEN ON THE SPIN-LATTICE RELAXATION OF SILICON IN CONDENSED SOL-GELS SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Article C1 UNIV NEW MEXICO,NSF,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. RP ASSINK, RA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 2 Z9 2 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 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD OCT 15 PY 1993 VL 105 IS 1 BP 19 EP 24 DI 10.1006/jmra.1993.1243 PG 6 WC Physics, Atomic, Molecular & Chemical SC Physics GA MF841 UT WOS:A1993MF84100004 ER PT J AU WOELK, K RATHKE, JW KLINGLER, RJ AF WOELK, K RATHKE, JW KLINGLER, RJ TI ROTATING-FRAME NMR MICROSCOPY USING TOROID CAVITY DETECTORS SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Note ID SURFACE COILS; SPECTROSCOPY C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439. NR 19 TC 22 Z9 22 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD OCT 15 PY 1993 VL 105 IS 1 BP 113 EP 116 DI 10.1006/jmra.1993.1259 PG 4 WC Physics, Atomic, Molecular & Chemical SC Physics GA MF841 UT WOS:A1993MF84100020 ER PT J AU DUNN, AM LAFLAMME, R AF DUNN, AM LAFLAMME, R TI THE LEAST ACTION PRINCIPLE AND THE SPIN OF GALAXIES IN THE LOCAL GROUP SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE CELESTIAL MECHANICS, STELLAR DYNAMICS; GALAXY, KINEMATICS AND DYNAMICS; GALAXIES, INDIVIDUAL, M31; GALAXIES, INTERACTIONS; GALAXIES, KINEMATICS AND DYNAMICS; LOCAL GROUP ID ANGULAR-MOMENTUM; TORQUES AB Using Peebles's least action principle, we determine trajectories for the galaxies in the Local Group and the more massive galaxies in the local neighbourhood. We deduce the resulting angular momentum for the whole of the Local Group, and study the tidal force acting on the Local Group and its galaxies. Although the Andromeda nebula and the Milky Way dominate the tidal force acting on each other during the present epoch, we show that there is a transition time at z almost-equal-to 1, before which the tidal force is dominated by galaxies outside the Local Group in each case. This shows that the Local Group cannot be considered as an isolated system as far as the tidal forces are concerned. We integrate the tidal torques acting on the Milky Way and the Andromeda nebula and derive their spin angular momenta, obtaining results that are comparable with observation. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DUNN, AM (reprint author), UNIV CAMBRIDGE,INST ASTRON,MADINGLEY RD,CAMBRIDGE CB3 0HA,ENGLAND. NR 14 TC 30 Z9 30 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD OCT 15 PY 1993 VL 264 IS 4 BP 865 EP 874 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MB908 UT WOS:A1993MB90800013 ER PT J AU RAUBENHEIMER, TO EGAWA, K KIKUCHI, M KUBO, K KURODA, S OIDE, K SAKANAKA, S TERUNUMA, N URAKAWA, J AF RAUBENHEIMER, TO EGAWA, K KIKUCHI, M KUBO, K KURODA, S OIDE, K SAKANAKA, S TERUNUMA, N URAKAWA, J TI THE VERTICAL EMITTANCE IN THE ATF DAMPING RING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The results of calculations and simulations of the vertical emittance in the KEK Accelerator Test Facility damping ring are described. Both systematic and random alignment tolerances and a skew correction scheme are presented which limit the normalized vertical emittance to gammaepsilon(y) < 4.8 x 10(-8) m rad. The effect of intrabeam scattering on the vertical emittance is calculated. C1 KEK,NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RP RAUBENHEIMER, TO (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1993 VL 335 IS 1-2 BP 1 EP 10 DI 10.1016/0168-9002(93)90250-L PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MB434 UT WOS:A1993MB43400001 ER PT J AU GARCZYNSKI, V AF GARCZYNSKI, V TI CONSTRUCTION OF THE COURANT-SNYDER INVARIANTS FOR THE NONLINEAR EQUATIONS OF MOTION AND CRITERION FOR THE LONG-TERM STABILITY OF THE BEAM IN A STORAGE-RING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The Courant-Snyder invariants become Lyapunov functions when the beta-functions admit non-zero lower and finite upper bounds. The long-term stability of motion then follows. This alternative criterion for the long-term stability of motion can be generalized to the nonlinear case. A single particle subjected to an arbitrary static magnetic field is considered in some detail as an example. RP GARCZYNSKI, V (reprint author), BROOKHAVEN NATL LAB,ALTERNATING GRADIENT SYNCHROTRON,UPTON,NY 11973, USA. NR 24 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1993 VL 335 IS 1-2 BP 11 EP 16 DI 10.1016/0168-9002(93)90251-C PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MB434 UT WOS:A1993MB43400002 ER PT J AU LEBRUN, P LINDENMEYER, C STUTTE, L CEASE, H CHISSUS, D AF LEBRUN, P LINDENMEYER, C STUTTE, L CEASE, H CHISSUS, D TI A 1ST APPROACH TO MECHANICAL CONSTRUCTION AND COOLING OF A COMPOSITE 3D SILICON VERTEX DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB This paper presents first results on mechanical and cooling studies for a 3D silicon vertex detector designed for B physics at a hadron collider. Prototype modules were built from raw silicon wafers. One module was instrumented with resistors to simulate readout electronics. Both module movement and temperature variations were recorded. A cooling method utilizing simple air/helium flow was investigated, but proved inadequate because of too large temperature anisotropies. RP LEBRUN, P (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 14 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 OCT 15 PY 1993 VL 335 IS 1-2 BP 59 EP 68 DI 10.1016/0168-9002(93)90256-H PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MB434 UT WOS:A1993MB43400007 ER PT J AU MARTIN, C WALKER, T ANDERSON, LW SWENSON, DR AF MARTIN, C WALKER, T ANDERSON, LW SWENSON, DR TI LASER OPTICAL-PUMPING OF POTASSIUM IN A HIGH MAGNETIC-FIELD USING LINEARLY POLARIZED-LIGHT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID EXCHANGE AB It is shown experimentally that in a high magnetic field a potassium vapor can be optically pumped to a high electron spin polarization by light polarized parallel to the magnetic field and incident normal to the magnetic field. The polarization of the K vapor is measured both by observing the fluorescence and by the Faraday effect. This method of optical pumping may be useful for spin polarized targets, C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MARTIN, C (reprint author), UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706, USA. RI Walker, Thad/N-5590-2014 OI Walker, Thad/0000-0002-0996-3351 NR 10 TC 6 Z9 6 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 OCT 15 PY 1993 VL 335 IS 1-2 BP 233 EP 238 DI 10.1016/0168-9002(93)90275-M PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MB434 UT WOS:A1993MB43400026 ER PT J AU DENBY, B LINDBLAD, T LINDSEY, CS SZEKELY, G MOLNAR, J EIDE, A AMENDOLIA, SR SPAZIANI, A AF DENBY, B LINDBLAD, T LINDSEY, CS SZEKELY, G MOLNAR, J EIDE, A AMENDOLIA, SR SPAZIANI, A TI INVESTIGATION OF A VLSI NEURAL-NETWORK CHIP AS PART OF A SECONDARY VERTEX TRIGGER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID TRACK AB An analog VLSI neural network chip (ETANN) has been trained to detect secondary vertices in simulated data for a fixed target heavy flavour production experiment. The detector response and associative memory track finding were modelled by a simulation, but the vertex detection was performed in hardware by the neural network chip and requires only a few microseconds per event. The chip correctly tags 30% of the heavy flavour events while rejecting 99% of the background, and is thus well adapted for secondary vertex triggering applications. A general purpose VME module for interfacing the ETANN to experiments, equipped with ADC/DAC circuits and a 68070 CPU, is also presented. C1 MANNE SIEGBAHN INST,STOCKHOLM,SWEDEN. INST NUCL RES,DEBRECEN,HUNGARY. OSTFOLD COLL,HALDEN,NORWAY. UNIV SASSARI,I-07100 SASSARI,ITALY. IST NAZL FIS NUCL,PISA,ITALY. RP DENBY, B (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 16 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1993 VL 335 IS 1-2 BP 296 EP 304 DI 10.1016/0168-9002(93)90284-O PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MB434 UT WOS:A1993MB43400035 ER PT J AU RADAELLI, PG WAGNER, JL HUNTER, BA BENO, MA KNAPP, GS JORGENSEN, JD HINKS, DG AF RADAELLI, PG WAGNER, JL HUNTER, BA BENO, MA KNAPP, GS JORGENSEN, JD HINKS, DG TI STRUCTURE, DOPING AND SUPERCONDUCTIVITY IN HGBA2CACU2O6+DELTA (TC-LESS-THAN-OR-EQUAL-TO-128-K) SO PHYSICA C LA English DT Article ID NEUTRON AB We have studied the defect structure and superconducting properties of HgBa2CaCu2O6+delta by neutron powder diffraction, AC susceptibility and DC resistivity. An as-synthesized sample has an onset T(c) of 128 K, the highest vet reported for this material. The critical temperature decreases slightly (126 K) after oxygenation, and drops to 92 K after reduction in flowing argon. Neutron diffraction data give evidence that the primary doping mechanism in this material is provided by oxygen atoms in an interstitial position, similar to the case of the one-layer compound HgBa2CuO4+delta. The occupancy of this site varies from 0.08(1) for the argon-reduced sample to 0.22(1) for the oxygenated sample. Unlike the case of the one-layer compound. no evidence of an additional defect site was found in these samples. HgBa2CaCu2O6+delta has remarkably long copper-apical oxygen distances and almost perfectly flat CuO2 planes. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP RADAELLI, PG (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 24 TC 150 Z9 151 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 15 PY 1993 VL 216 IS 1-2 BP 29 EP 35 DI 10.1016/0921-4534(93)90630-9 PG 7 WC Physics, Applied SC Physics GA MD161 UT WOS:A1993MD16100006 ER PT J AU CHOU, FC JOHNSTON, DC CHEONG, SW CANFIELD, PC AF CHOU, FC JOHNSTON, DC CHEONG, SW CANFIELD, PC TI PREPARATION, MAGNETIZATION AND ELECTRICAL-RESISTIVITY OF ELECTROCHEMICALLY OXIDIZED LA2CUO4+DELTA SINGLE-CRYSTALS SO PHYSICA C LA English DT Article ID PHASE-SEPARATION; SUPERCONDUCTORS; OXIDATION; FLUX; SUSCEPTIBILITY; ANISOTROPY; TRANSPORT; MODEL AB We report that oxygen can be intercalated at room temperature into single crystal La2CuO4 through slow electrochemical oxidation in aqueous base. Magnetic susceptibility chi(T) measurements indicate that homogeneous La2CuO4+delta crystals can be obtained with T(c) almost-equal-to 40 K. With increasing delta, two distinct superconducting phases are observed with T(c) almost-qual-to 32 and 40 K, respectively; the latter is lower than the maximum T(c) almost-equal-to 45 K of the corresponding polycrystalline samples, whereas the former is very similar. The resistivity anisotropy rho(c)/rho(ab) increases from approximately 100 at 290 K to approximately 300 at 50 K. The susceptibility anisotropy, chi(c)-chi(ab), is significantly larger than in the La2CuO4 parent crystals. The magnetically determined critical current density J(c)(H) of a La2CuO4+delta crystal with T(c)=40 K decreases exponentially with magnetic field H, with J(c)(0) approximately 5 x 10(4) and 9 X 10(4) A/cm2 for H\\c and H\\ab, respectively. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP CHOU, FC (reprint author), IOWA STATE UNIV SCI & TECHNOL,USDOE,AMES LAB,AMES,IA 50011, USA. RI Canfield, Paul/H-2698-2014 NR 31 TC 55 Z9 55 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 OCT 15 PY 1993 VL 216 IS 1-2 BP 66 EP 76 DI 10.1016/0921-4534(93)90634-3 PG 11 WC Physics, Applied SC Physics GA MD161 UT WOS:A1993MD16100010 ER PT J AU LINDEMER, TB SPECHT, ED MACDOUGALL, CS TAYLOR, GM PYE, SL AF LINDEMER, TB SPECHT, ED MACDOUGALL, CS TAYLOR, GM PYE, SL TI NONSTOICHIOMETRY AND DECOMPOSITION OF LA1+ZBA2-ZCU3OY AND LA4BACU5O13-W SO PHYSICA C LA English DT Article ID BA-CU-O; OXYGEN DEFICIENCY; PHASE; SUPERCONDUCTIVITY; SYSTEM; LABA2CU3OY; 90-K; ATMOSPHERE AB The temperature (T, K) and oxygen pressure (p(O2), Pa) dependence of oxygen content in La1+zBa2-zCu3Oy (123) and La4BaCu5O13-w (415) were determined over the ranges 10 Pa to 0.1 MPa O2, 0.0 less-than-or-equal-to z less-than-or-equal-to 0.7 and 523 less-than-or-equal-to T less-than-or-equal-to 1223 K. The data for each phase were correlated with chemical thermodynamic representations. For La1+zBa2-zCu3Oy, the T-z-y-p(O2) behavior was modeled as a solution of LaBa2Cu3O7-x and 415. The experimental data demonstrated 7-x values < 6 at high temperatures, while they exceeded 6.99 only at temperatures approaching ambient at 0.1 MPa O2. These two characteristics are not known to occur in the other lanthanide and Y analogues. The T-z-p(O2) dependence of high-temperature decomposition was determined and, in conjunction with X-ray analysis, permitted construction of the phase diagram lying between LaBa2Cu3O7-x and 415. Effects of residual carbonate content were also determined. RP LINDEMER, TB (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009 OI Specht, Eliot/0000-0002-3191-2163 NR 31 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 15 PY 1993 VL 216 IS 1-2 BP 99 EP 110 DI 10.1016/0921-4534(93)90639-8 PG 12 WC Physics, Applied SC Physics GA MD161 UT WOS:A1993MD16100015 ER PT J AU COOPER, F SHEPARD, H LUCHERONI, C SODANO, P AF COOPER, F SHEPARD, H LUCHERONI, C SODANO, P TI POST-GAUSSIAN VARIATIONAL METHOD FOR THE NONLINEAR SCHRODINGER-EQUATION - SOLITON BEHAVIOR AND BLOWUP SO PHYSICA D LA English DT Article AB We use Dirac's time-dependent variational principle to discuss several features of the general nonlinear Schrodinger equation i(partial derivative psi/partial derivative t) + del2psi + \psi*psi\(kappa)psi = 0 in d spatial dimensions for arbitrary nonlinearity parameter kappa. We employ a family of trial variational wave functions, more general than Gaussians, which can be treated analytically and which preserve the canonical structure (and hence the conservation laws) of the exact system. As examples, we derive an approximation to the one-dimensional soliton solution and demonstrate the ''universality'' of the critical exponent for blowup in the supercritical case, kappad > 2. For the critical case kappad = 2, we find that one gets an excellent estimate for the critical mass necessary for blowup when we minimize the blowup mass with respect to the non-Gaussian variational parameter. C1 UNIV PERUGIA,DIPARTIMENTO FIS,I-06100 PERUGIA,ITALY. UNIV PERUGIA,SEZ INFU,I-06100 PERUGIA,ITALY. UNIV NEW HAMPSHIRE,DEPT PHYS,DURHAM,NH 03824. RP COOPER, F (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 12 TC 12 Z9 12 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD OCT 15 PY 1993 VL 68 IS 3-4 BP 344 EP 350 DI 10.1016/0167-2789(93)90129-O PG 7 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA MC779 UT WOS:A1993MC77900004 ER PT J AU MA, SK SHUNG, KWK AF MA, SK SHUNG, KWK TI AC RESPONSE OF AN ELECTRON-GAS UNDER A STRONG ELECTRIC-FIELD BIAS SO PHYSICAL REVIEW B LA English DT Article ID TRANSPORT AB A linear ac response theory of an electron gas under a strong, static electric field (E) is presented, and applied to doped GaAs for a detailed calculation. This is a generalization of the force-balance transport equation developed by Ting et al., with which the nonlinear conductivity under a strong field can be studied. The dynamic screening effect is included in the theory and studied analytically. The result is expressed by a modified Drude formula, with an effective lifetime which is a function of the frequency and also of E-both its magnitude and its direction. The calculated optical reflectivity and absorption rate show anomalous structure at frequencies close to the plasmon oscillation, when the nonlinear dc effect due to a strong E is important. The anomaly is expected to be experimentally measurable. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MA, SK (reprint author), NATL TSING HUA UNIV,DEPT PHYS,HSINCHU 30043,TAIWAN. NR 9 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 15 BP 10751 EP 10757 DI 10.1103/PhysRevB.48.10751 PG 7 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500009 ER PT J AU ZHANG, SB YEH, CY ZUNGER, A AF ZHANG, SB YEH, CY ZUNGER, A TI ELECTRONIC-STRUCTURE OF SEMICONDUCTOR QUANTUM FILMS SO PHYSICAL REVIEW B LA English DT Article ID PSEUDOPOTENTIAL CALCULATIONS; SUPERLATTICES; CLUSTERS; PHOTOEMISSION; SURFACE; GAAS; HETEROJUNCTIONS; MODEL AB The electronic structure of thin (less-than-or-equal-to 30 angstrom) free-standing ideal films of Si(001), Si(110), and GaAs(110) is calculated using a plane-wave pseudopotential description. Unlike the expectation based on the simple effective-mass model, we find the following. (i) The band gaps of (001) quantum films exhibit even-odd oscillation as a function of the number N of monolayers. (ii) In addition to sine-type envelope functions which vanish at the film boundaries, some states have cosine envelope functions with extrema at boundaries. (iii) Even-layer Si(001) films exhibit at the valence-band maximum a state whose energy does not vary with the film thickness. Such zero confinement states have constant envelope throughout the film. (iv) Optical transitions in films exhibit boundary-imposed selection rules. Furthermore, oscillator strengths for pseudodirect transitions in the vicinity of forbidden direct transitions can be enhanced by several orders of magnitude. These findings, obtained in direct supercell calculations, can be explained in terms of a truncated crystal (TC) analysis. In this approach the film's wave functions are expanded in terms of pairs of bulk wave functions exhibiting a destructive interference at the boundaries. This maps the eigenvalue spectra of a film onto the bulk band structure evaluated at special k points which satisfy the boundary conditions. We find that the TC representation reproduces accurately the above-mentioned results of direct diagonalization of the film's Hamiltonian. This provides a simple alternative to the effective-mass model and relates the properties of quantum structures to those of the bulk material. RP ZHANG, SB (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013; Krausnick, Jennifer/D-6291-2013; Zhang, Shengbai/D-4885-2013 OI Zhang, Shengbai/0000-0003-0833-5860 NR 27 TC 74 Z9 76 U1 1 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 OCT 15 PY 1993 VL 48 IS 15 BP 11204 EP 11219 DI 10.1103/PhysRevB.48.11204 PG 16 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500064 ER PT J AU BILALBEGOVIC, G TOSATTI, E AF BILALBEGOVIC, G TOSATTI, E TI INCOMPLETE MELTING OF THE AU(100) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID SCANNING TUNNELING MICROSCOPY; GE(111) SURFACE; AU(001) SURFACE; PHASE-TRANSITION; AU(111) SURFACE; RECONSTRUCTION; DIFFRACTION; SIMULATION; FLUCTUATIONS; DISORDER AB We study the high-temperature disordering of the reconstructed Au(100) surface by molecular-dynamics simulation using a many-body interatomic potential. We find that the surface deconstructs at 0.8 T(m), where T(m) is the bulk melting temperature, in good agreement with experimental data, but proper surface melting does not occur close to the bulk melting point. Instead, there is an in-plane disordering of the two topmost layers. The thickness of the disordered region remains constant with increasing temperature, indicating blocked, or incomplete, melting of the (100) crystalline substrate. An analysis of the structure reveals that crystalline and disordered islands coexist on the first two surface layers for temperatures between those for deconstruction and bulk melting. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. SCUOLA INT SUPER STUDI AVANZATI, I-34014 TRIESTE, ITALY. INT CTR THEORET PHYS, I-34014 TRIESTE, ITALY. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 46 TC 39 Z9 39 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 15 BP 11240 EP 11248 DI 10.1103/PhysRevB.48.11240 PG 9 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500068 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI STRUCTURE OF H-COVERED BE(0001) SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; HYDROGEN ADSORPTION; SURFACE; PSEUDOPOTENTIALS; BERYLLIUM AB In accord with the inverse bond-order-bond-length correlation expected for group-II elements, linearized augmented-plane-wave (LAPW) calculations show that a 1 x 1 monolayer of H, adsorbed on Be(0001), should cause the outer Be layers' separation to be close to ideal, i.e., to be contracted relative to the substantial expansion seen for clean Be(0001). However, the LAPW work functions, and also the H-induced surface-state and resonance positions calculated for 1 x 1 H overlayers, are in poor agreement with experiment. Based on the known accuracy of LAPW calculations, these disagreements indicate that at monolayer coverage, adsorbed H does not all reside above the outer Be layer. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,DEPT SURFACE & INTERFACE SCI,ALBUQUERQUE,NM 87185, USA. NR 24 TC 12 Z9 12 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 OCT 15 PY 1993 VL 48 IS 15 BP 11270 EP 11276 DI 10.1103/PhysRevB.48.11270 PG 7 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500073 ER PT J AU ROELOFS, LD FOILES, SM AF ROELOFS, LD FOILES, SM TI MO(001) 7TH-ORDER RECONSTRUCTION - GROUND-STATE STRUCTURE AND RECONSTRUCTION MECHANISM SO PHYSICAL REVIEW B LA English DT Article ID W(001) SURFACE; TRANSITION AB Using a tight-binding-based atomistic analysis of total energies including angular-dependent forces with a parametrization suitable for Mo, we have examined candidate structures for the Mo(001) surface reconstruction. We find that some structures of (N square-root 2 x square-root 2)R45-degrees symmetry, N an odd integer, are favorable relative both to the unreconstructed surface and to the (square-root 2 x square-root 2)R45-degrees structure like that found on the W(001). This is consistent with recent diffraction studies which have revealed a commensurate reconstruction of c (7 square-root 2 x square-root 2)R45-degrees symmetry, although there is a discrepancy in the value of N. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP ROELOFS, LD (reprint author), HAVERFORD COLL,DEPT PHYS,HAVERFORD,PA 19041, USA. NR 15 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 15 BP 11287 EP 11290 DI 10.1103/PhysRevB.48.11287 PG 4 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500075 ER PT J AU KELLOGG, GL AF KELLOGG, GL TI DIFFUSION OF INDIVIDUAL PT ATOMS ON SINGLE-CRYSTAL SURFACES OF RHODIUM SO PHYSICAL REVIEW B LA English DT Article ID SELF-DIFFUSION; EXCHANGE MECHANISM; METAL-SURFACES; ADATOM; PT(001); NI; PD; REPLACEMENT; IRIDIUM; W(211) AB The diffusion of individual Pt atoms on five low-index crystal planes of Rh has been investigated by field-ion microscopy. The activation energy of surface diffusion is found to depend strongly on the crystal plane and to increase in the order of (111) < (311) < (110) < (331) < (100). It ranges from below 0.22 eV on Rh(111) to 0.92 eV on Rh (100). The diffusion mechanism on all surfaces is site-to-site hopping, with the exception of Rh(110), where convincing evidence for exchange displacements is obtained. The reflection barrier against migration off the plane edge also exhibits a strong structure sensitivity, from a large reflection on Rh(311) to essentially none on Rh(100) and Rh(331). The results are compared with previous field-ion-microscope studies of self-diffusion on Rh and Pt. RP KELLOGG, GL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87112, USA. NR 33 TC 9 Z9 9 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 OCT 15 PY 1993 VL 48 IS 15 BP 11305 EP 11312 DI 10.1103/PhysRevB.48.11305 PG 8 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500078 ER PT J AU ZHANG, BL WANG, CZ CHAN, CT HO, KM AF ZHANG, BL WANG, CZ CHAN, CT HO, KM TI THERMAL DISINTEGRATION OF CARBON FULLERENES SO PHYSICAL REVIEW B LA English DT Article ID 1ST-PRINCIPLES MOLECULAR-DYNAMICS; ENERGY AB The process of thermal disintegration of carbon fullerenes is simulated by molecular dynamics using a tight-binding-force model. The most commonly observed fragments after the disintegration of carbon fullerenes are dimers, rings, and multiple rings. The fragmentation temperatures are obtained for fullerenes ranging from C20 to C90. The fragmentation temperature increases almost linearly with the cluster size for small cages (n less-than-or-equal-to 58), but becomes almost constant for larger fullerenes (n = 60 and n greater-than-or-equal-to 70). The effects of electronic entropy on the fragmentation temperature of fullerene are also discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZHANG, BL (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 14 TC 49 Z9 49 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 OCT 15 PY 1993 VL 48 IS 15 BP 11381 EP 11384 DI 10.1103/PhysRevB.48.11381 PG 4 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500088 ER PT J AU PRICE, R ZHU, XJ PLATZMAN, PM AF PRICE, R ZHU, XJ PLATZMAN, PM TI FREEZING OF THE QUANTUM HALL LIQUID AT V = 1/7 AND 1/9 SO PHYSICAL REVIEW B LA English DT Note ID STRONG MAGNETIC-FIELD; WIGNER CRYSTAL; ACTIVATION-ENERGIES; PHASE AB We compare the free energy computed from the ground-state energy and low-lying excitations of the two-dimensional Wigner solid and the fractional quantum Hall liquid, at magnetic filling factors nu = 1/7 and 1/9. We find that the Wigner solid melts into the fractional quantum Hall liquid at roughly the same temperature as that of some recent luminescence experiments, while it remains a solid at the lower temperatures characteristic of the transport experiments. We propose this melting as a consistent interpretation of both sets of experiments. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP PRICE, R (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 19 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 15 BP 11473 EP 11476 DI 10.1103/PhysRevB.48.11473 PG 4 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500112 ER PT J AU JOHNSON, DD PINSKI, FJ AF JOHNSON, DD PINSKI, FJ TI INCLUSION OF CHARGE CORRELATIONS IN CALCULATIONS OF THE ENERGETICS AND ELECTRONIC-STRUCTURE FOR RANDOM SUBSTITUTIONAL ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID TOTAL-ENERGY; TRANSITION; IMPURITIES; NICKEL AB Currently, the coherent-potential approximation (CPA) implemented via the multiple-scattering theory of Korringa, Kohn, and Rostoker (KKR) gives the best first-principles description of the electronic structure for random substitutional alloys. However, the total energy has an important component of electrostatic energy missing, namely, that arising from the correlation of charges with varying atomic environments. We develop a ''charge-correlated'' CPA method (cc-CPA) which includes (some) local environmental charge correlations within the KKR-CPA method. We investigate the cc-CPA energetics for several alloys and show that the formation energies are in better agreement with experimental results. These calculations show that the excess charge on a species is almost completely screened by the first-neighbor shell. We then derive a simplified scheme to include the vast majority of the omitted electrostatic energy from charge correlations which requires only a species-dependent shift of the potentials within the original KKR-CPA method. We also discuss the ramifications on the electronic structure. C1 UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221. RP JOHNSON, DD (reprint author), SANDIA NATL LABS,DIV 8341,LIVERMORE,CA 94551, USA. OI Johnson, Duane/0000-0003-0794-7283 NR 23 TC 111 Z9 111 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 OCT 15 PY 1993 VL 48 IS 16 BP 11553 EP 11560 DI 10.1103/PhysRevB.48.11553 PG 8 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100002 ER PT J AU ASELAGE, TL EMIN, D SAMARA, GA TALLANT, DR VANDEUSEN, SB EATOUGH, MO TARDY, HL VENTURINI, EL JOHNSON, SM AF ASELAGE, TL EMIN, D SAMARA, GA TALLANT, DR VANDEUSEN, SB EATOUGH, MO TARDY, HL VENTURINI, EL JOHNSON, SM TI PHOSPHORUS DOPING OF BORON CARBIDES SO PHYSICAL REVIEW B LA English DT Article ID CONDUCTIVITY AB Substitution of an electron donor such as phosphorus for a carbon or boron atom in p-type semiconducting boron carbides is expected to reduce the hole concentration. Phosphorus-doped boron carbide samples have been prepared by hot isostatic pressing with homogeneous dopant levels of up to one phosphorus atom per ten unit cells. Raman spectroscopy and x-ray diffraction confirm the presence of phosphorus within two-atom intericosahedral chains. The high-temperature dc conductivities of doped samples were substantially lower than those of undoped boron carbides. This effect was due to a combination of reduced carrier concentrations and increased hopping activation energies. The low-temperature ac conductivity of doped samples is also smaller than that of undoped samples. However, the number of carriers participating in the ac conduction is a very small fraction (< 0.1%) of the total carrier density. C1 SRI INT,MENLO PK,CA 94025. RP ASELAGE, TL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 30 TC 17 Z9 17 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 16 BP 11759 EP 11766 DI 10.1103/PhysRevB.48.11759 PG 8 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100023 ER PT J AU RUBIO, A CORKILL, JL COHEN, ML SHIRLEY, EL LOUIE, SG AF RUBIO, A CORKILL, JL COHEN, ML SHIRLEY, EL LOUIE, SG TI QUASI-PARTICLE BAND-STRUCTURE OF ALN AND GAN SO PHYSICAL REVIEW B LA English DT Article ID EXCHANGE-CORRELATION POTENTIALS; QUASI-PARTICLE ENERGIES; ROCK-SALT-TYPE; GALLIUM NITRIDE; HIGH-PRESSURE; ALUMINUM NITRIDE; SURFACE-STATES; SEMICONDUCTORS; PSEUDOPOTENTIALS; PHASE AB The ab initio pseudopotential method within the local-density approximation and the quasiparticle approach have been used to investigate the electronic properties. of AlN and GaN in the wurtzite and zinc-blende structures. The quasiparticle band-structure energies are calculated using a model dielectric matrix for the evaluation of the electron self-energy. For this calculation, good agreement with the experimental results for the minimum band gaps in the wurtzite structure is obtained. In the zinc-blonde structure we predict that AlN will be an indirect (GAMMA to X) wide band-gap semiconductor (4.9 eV) and that GaN will have a direct gap of 3.1 eV at F in good agreement with recent absorption experiments on cubic GaN (3.2-3.3 eV). A discussion of the direct versus indirect gap as well as other differences in electronic structure between the wurtzite and zinc-blende phases is presented. Other properties of quasiparticle excitations are predicted in this work and remain to be confirmed by experiment. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Rubio, Angel/A-5507-2008 OI Rubio, Angel/0000-0003-2060-3151 NR 54 TC 322 Z9 325 U1 4 U2 36 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 OCT 15 PY 1993 VL 48 IS 16 BP 11810 EP 11816 DI 10.1103/PhysRevB.48.11810 PG 7 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100030 ER PT J AU ALONSO, RG MASCARENHAS, A HORNER, GS BERTNESS, KA KURTZ, SR OLSON, JM AF ALONSO, RG MASCARENHAS, A HORNER, GS BERTNESS, KA KURTZ, SR OLSON, JM TI SPONTANEOUS ORDERING IN GAINP2 - A POLARIZED-PIEZOMODULATED-REFLECTIVITY STUDY SO PHYSICAL REVIEW B LA English DT Article ID VAPOR-PHASE EPITAXY; SEMICONDUCTOR ALLOYS; PHOTOLUMINESCENCE; TEMPERATURE; GA0.52IN0.48P; SPECTROSCOPY; DEPENDENCE AB Piezomodulated reflectivity is used to probe the electronic structure of GaInP2 epilayers grown by organometallic chemical-vapor epitaxy on misoriented [001] GaAs substrates. The epilayers, grown at different growth temperatures using 2-degrees and 6-degrees misoriented substrates, exhibit various degrees of ordering. Our study provides information on the fundamental gap, crystal-field splitting, and spin-orbit splitting for temperatures ranging from 6 to 250 K. RP ALONSO, RG (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 27 TC 55 Z9 55 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 16 BP 11833 EP 11837 DI 10.1103/PhysRevB.48.11833 PG 5 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100033 ER PT J AU SU, C SHI, X TANG, D HESKETT, D TSUEI, KD AF SU, C SHI, X TANG, D HESKETT, D TSUEI, KD TI CORE-LEVEL PHOTOEMISSION AND WORK-FUNCTION INVESTIGATION OF NA ON CU(110) SO PHYSICAL REVIEW B LA English DT Article ID ALKALI-METAL ADSORPTION; FCC 110 SURFACES; INDUCED RECONSTRUCTION; AL(111); CHEMISORPTION; OVERLAYERS; MECHANISM; GEOMETRY; AG(110) AB Cor-level photoemission, low-energy electron diffraction (LEED), and work-function change measurements have been carried out to study the coverage dependence of Na/Cu(110) at room temperature. The results of LEED and work-function measurements are qualitatively similar to most other investigations of alkali-metal adsorption on fcc(110) metal surfaces. With LEED, we observed an alkali-metal-induced (1 X 2) reconstruction at intermediate coverage. We have performed a simple calculation to account for the work-function differences between Na/fcc(110) and Na/fcc(111) metal surfaces. The comparison of coverage-dependent core-level binding-energy shifts between Na/Cu(110) and Na/Cu(111) reveals that a low-coverage plateau in the curve of binding energy vs Na coverage for Na/Cu(110) is associated with the Na-induced reconstruction, and can be accounted for within a localized picture of the reconstruction. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP SU, C (reprint author), UNIV RHODE ISL, DEPT PHYS, KINGSTON, RI 02881 USA. NR 33 TC 12 Z9 12 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 16 BP 12146 EP 12150 DI 10.1103/PhysRevB.48.12146 PG 5 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100076 ER PT J AU GU, C OLSON, CG LYNCH, DW AF GU, C OLSON, CG LYNCH, DW TI PHOTOEMISSION-STUDY OF CE-CATALYZED OXIDATION OF W(110) AND W(111) SO PHYSICAL REVIEW B LA English DT Article ID CORE-LEVEL SHIFTS; CERIUM OVERLAYERS; OXIDE SURFACES; OXYGEN; ADSORPTION; TANTALUM; TA; ENHANCEMENT; ALUMINUM; NIOBIUM AB Different catalytic oxidation effects of Ce on W(110) and W(111) were observed with photoemission spectroscopy. On Ce-covered W(110), the top W layer is quickly oxidized to a surface monoxide at room temperature. Oxidation is almost halted after the completion of one monolayer of WO. On Ce/W(111), instead of Wo, WO3 grows on the surface under the same conditions. The monolayer suboxide formation found on Ce/W(110) and Ce/Ta(110) (as reported earlier) is a direct consequence of the most densely packed structure of the bcc (110) surfaces. The more effective oxidation promotion on the W(111) surface is attributed to its open structure. The mechanism of Ce-catalyzed oxidation is further tested in this study. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. NR 36 TC 11 Z9 11 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 OCT 15 PY 1993 VL 48 IS 16 BP 12178 EP 12182 DI 10.1103/PhysRevB.48.12178 PG 5 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100080 ER PT J AU TURNER, MS AF TURNER, MS TI PRODUCTION OF SCALAR AND TENSOR PERTURBATIONS IN INFLATIONARY MODELS SO PHYSICAL REVIEW D LA English DT Article ID ISOTHERMAL DENSITY PERTURBATIONS; MICROWAVE BACKGROUND ANISOTROPY; GRAVITATIONAL-WAVES; EXTENDED INFLATION; FLUCTUATION SPECTRA; UNIVERSE SCENARIO; GRAND UNIFICATION; DARK MATTER; COSMOLOGY; COBE AB Scalar (density) and tensor (gravity-wave) perturbations provide the basis for the fundamental observable consequences of inflation, including CBR anisotropy and the formation of structure in the Universe. These perturbations are nearly scale invariant (Harrison-Zel'dovich spectrum), though a slight deviation from scale invariance (''tilt'') can have significant consequences for both CBR anisotropy and structure formation. In particular, a slightly tilted spectrum of scalar perturbations may improve the agreement of the cold dark matter scenario with the observational data. The amplitude and spectrum of the scalar and tensor perturbations depend upon the shape of the inflationary potential in the small interval where the scalar field responsible for inflation was between about 46 and 54 e-folds before the end of inflation. By expanding the inflationary potential in a Taylor series over this interval we show that the amplitudes of the perturbations and the power-law slopes of their spectra can be expressed in terms of the value of the potential 50 e-folds before the end of inflation, V50, its steepness x 50 = m(pl)V'50/V50, and the rate of change of its steepness, x'50 (a prime denotes a derivative with respect to the scalar field). In addition, the power-law index of the cosmic-scale factor at this time is q50 = [dlnR/dlnt]50 cogruent-to 16pi/X(50)2. (Formally, our results for the perturbation amplitudes and spectral indices are accurate to lowest order in the deviation from scale invariance.) In general, the deviation from scale invariance is such to enhance fluctuations on large scales, and is only significant for steep potentials, large x50, or potentials with rapidly changing steepness, large x'50. In the latter case, only the spectrum of scalar perturbations is significantly tilted. Steep potentials are characterized by a large tensor-mode contribution to the quadrupole CBR temperature anisotropy, a similar tilt in both scalar and tensor perturbations, and a slower expansion rate, i.e., smaller q50. Measurements of the amplitude and tilt of the scalar and tensor perturbations overdetermine V50, x50, and x'50, and r-an in principle be used to infer these quantities as well as for testing the inflationary hypothesis. Our formalism has its limitations; it is not applicable to potentials with unusual features in the region that affects astrophysical scales. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP TURNER, MS (reprint author), UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637, USA. NR 62 TC 62 Z9 62 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 OCT 15 PY 1993 VL 48 IS 8 BP 3502 EP 3512 DI 10.1103/PhysRevD.48.3502 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MG847 UT WOS:A1993MG84700012 ER PT J AU GRASSO, D KOLB, EW AF GRASSO, D KOLB, EW TI PLASMON DECAY TO V(V)OVER-BAR IN A RELATIVISTIC PLASMA SO PHYSICAL REVIEW D LA English DT Article ID NEUTRINO MAGNETIC-MOMENTS; NUCLEOSYNTHESIS; CONSTRAINTS AB The plasmon decay rate to neutrino-antineutrino pairs is calculated assuming a nonvanishing magnetic moment for the neutrino. Since we are interested in the ultrarelativistic regime (T > m(e)c2), an appropriate covariant formalism is introduced to treat collective plasma excitations. We show that this process could result in an important contribution to the production of wrong-helicity neutrinos in the early Universe. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. IST NAZL FIS NUCL,SEZIONE ROMA,ROME,ITALY. RP GRASSO, D (reprint author), UNIV ROMA LA SAPIENZA,SCUOLA DOTTORATO RICERCA,DIPARTIMENTO FIS,I-00185 ROME,ITALY. RI Grasso, Dario/I-2440-2012 OI Grasso, Dario/0000-0001-7761-7242 NR 23 TC 6 Z9 6 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 OCT 15 PY 1993 VL 48 IS 8 BP 3522 EP 3526 DI 10.1103/PhysRevD.48.3522 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MG847 UT WOS:A1993MG84700015 ER PT J AU KURKISUONIO, H LAGUNA, P MATZNER, RA AF KURKISUONIO, H LAGUNA, P MATZNER, RA TI INHOMOGENEOUS INFLATION - NUMERICAL EVOLUTION SO PHYSICAL REVIEW D LA English DT Article ID COSMOLOGICAL PERTURBATIONS; UNIVERSE MODELS AB We describe our three-dimensional numerical relativity code for the evolution of inhomogeneous cosmologies. During the evolution, the constraint equations are monitored but not solved. The code has been tested against perturbation theory with good results. We present some runs of inhomogeneous inflation with strongly inhomogeneous initial data. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,UNIV PK,PA 16802. UNIV TEXAS,CTR RELAT,AUSTIN,TX 78712. RP KURKISUONIO, H (reprint author), UNIV HELSINKI,DEPT THEORET PHYS,SF-00014 HELSINKI,FINLAND. RI Kurki-Suonio, Hannu/B-8502-2016 OI Kurki-Suonio, Hannu/0000-0002-4618-3063 NR 18 TC 26 Z9 26 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1993 VL 48 IS 8 BP 3611 EP 3624 DI 10.1103/PhysRevD.48.3611 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MG847 UT WOS:A1993MG84700027 ER PT J AU BARBERO, JF PEREZMERCADER, J AF BARBERO, JF PEREZMERCADER, J TI SUPERSPACE DEPENDENCE OF THE VILKOVISKY-DEWITT EFFECTIVE ACTION FOR QUANTUM-GRAVITY SO PHYSICAL REVIEW D LA English DT Article ID UNIQUE EFFECTIVE ACTION; DE-SITTER SPACE; FIELD THEORY; COSMOLOGICAL CONSTANT; DARK MATTER AB The definition of the Vilkovisky-DeWitt effective action for gravity theories permits the introduction of a metric in the field space that depends on a parameter lambda. We study the consequences in the quantum theory of keeping this parameter free in ordinary and in higher derivative gravity. We do this by computing the renormalization group equations for an arbitrary lambda. In both cases we see that it is possible to have a decay mechanism for the cosmological constant while maintaining a phenomenologically interesting behavior for Newton's constant. C1 LAB ASTROFIS ESPACIAL & FIS FUNDAMENTAL,E-28080 MADRID,SPAIN. CSIC,INST MATH & FIS FUNDAMENTAL,E-28006 MADRID,SPAIN. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BARBERO, JF (reprint author), SYRACUSE UNIV,DEPT PHYS,SYRACUSE,NY 13244, USA. NR 28 TC 3 Z9 3 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 OCT 15 PY 1993 VL 48 IS 8 BP 3663 EP 3671 DI 10.1103/PhysRevD.48.3663 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MG847 UT WOS:A1993MG84700032 ER PT J AU ALBRECHT, A AF ALBRECHT, A TI FOLLOWING A COLLAPSING WAVE-FUNCTION SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM BROWNIAN-MOTION; LOGICAL REFORMULATION; MECHANICS; ENVIRONMENT; DECOHERENCE; PACKET AB I study the quantum mechanics of a spin interacting with an ''apparatus.'' Although the evolution of the whole system is unitary, the spin evolution is not. The system is chosen so that the spin exhibits loss of quantum coherence, or ''wave function collapse,'' of the sort usually associated with a quantum measurement. The system is analyzed from the point of view of the spin density matrix (or ''Schmidt paths''), and also using the consistent histories approach. These two points of view are contrasted with each other. Connections between the results and the form of the Hamiltonian discussed in detail. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP ALBRECHT, A (reprint author), NASA,FERMILAB,CTR ASTROPHYS,POB 500,BATAVIA,IL 60510, USA. NR 35 TC 29 Z9 29 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 OCT 15 PY 1993 VL 48 IS 8 BP 3768 EP 3778 DI 10.1103/PhysRevD.48.3768 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MG847 UT WOS:A1993MG84700043 ER PT J AU PRISNER, TF MCDERMOTT, AE UN, S NORRIS, JR THURNAUER, MC GRIFFIN, RG AF PRISNER, TF MCDERMOTT, AE UN, S NORRIS, JR THURNAUER, MC GRIFFIN, RG TI MEASUREMENT OF THE G-TENSOR OF THE P700+CENTER-DOT SIGNAL FROM DEUTERATED CYANOBACTERIAL PHOTOSYSTEM-I PARTICLES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID ELECTRON-SPIN-RESONANCE; RHODOPSEUDOMONAS-SPHAEROIDES; REACTION CENTERS; CHLOROPLASTS; PHOTOSYNTHESIS; SPECTROSCOPY; ABSORPTION; VIRIDIS; SPECTRA AB We report high-field continuous wave EPR spectra of P700+. in preparations obtained from deuterated cyanobacteria (Synechococcus lividus). Measurements were performed with photosystem I (PS-I) preparations, whole cells from cyanobacteria grown in (H2O)-H-2, and photosystem II (PS-H) preparations, as well as with protonated PS-I preparations. Because of the significantly improved resolution of our 140-GHz spectrometer (as compared with X- or Q-band EPR) the principal values of the g-tensor of the primary donor P700+. could be resolved and measured with high accuracy as g11 = 2.00304, g22 = 2.00262, and g33 = 2.00232. Other signals arising from Mn2+ and a dark signal from PS-IL at g almost-equal-to 2.00266 are distinguished from the P700+. g-tensor powder pattern. The measured g values are compared with those of several bacterial reaction center donors. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. FREE UNIV BERLIN,FACHBEREICH PHYS,W-1000 BERLIN 33,GERMANY. MIT,DEPT CHEM,CAMBRIDGE,MA 02139. RP PRISNER, TF (reprint author), MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139, USA. FU NCRR NIH HHS [RR-00995]; NIGMS NIH HHS [GM-13318, GM-38352] NR 30 TC 51 Z9 53 U1 0 U2 4 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 OCT 15 PY 1993 VL 90 IS 20 BP 9485 EP 9488 DI 10.1073/pnas.90.20.9485 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MC570 UT WOS:A1993MC57000053 PM 8415727 ER PT J AU VANELP, J GEORGE, SJ CHEN, J PENG, G CHEN, CT TJENG, LH MEIGS, G LIN, HJ ZHOU, ZH ADAMS, MWW SEARLE, BG CRAMER, SP AF VANELP, J GEORGE, SJ CHEN, J PENG, G CHEN, CT TJENG, LH MEIGS, G LIN, HJ ZHOU, ZH ADAMS, MWW SEARLE, BG CRAMER, SP TI SOFT-X-RAY MAGNETIC CIRCULAR-DICHROISM - A PROBE FOR STUDYING PARAMAGNETIC BIOINORGANIC SYSTEMS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE X-RAY ABSORPTION SPECTROSCOPY; PYROCOCCUS-FURIOSUS ID PYROCOCCUS-FURIOSUS; ABSORPTION-SPECTRA; ULTRATHIN FILMS; NICKEL; MONOCHROMATORS; SPECTROSCOPY; RUBREDOXIN; IRON AB Soft x-ray magnetic circular dichroism was used to study a paramagnetic bioinorganic system. We measured the Fe L edges of Pyrococcus furiosus rubredoxin, using circularly polarized synchrotron radiation, a split-coil superconducting magnet, low sample temperatures, and fluorescence detection. The observed dichroism effect is strong (30%) and in general agreement with the calculation. The method is element- and oxidation state-specific, and the data can be interpreted by established theoretical procedures. Soft x-ray magnetic circular dichroism demonstrates enormous potential as a probe for studying paramagnetic systems in biology, chemistry, and material science. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. UNIV GEORGIA,CTR METALLOENZYME STUDIES,ATHENS,GA 30602. UNIV GRONINGEN,CTR MAT SCI,DEPT APPL & SOLID STATE PHYS,9747 AG GRONINGEN,NETHERLANDS. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. UNIV GEORGIA,DEPT BIOCHEM,ATHENS,GA 30602. FU NIGMS NIH HHS [GM-44380] NR 24 TC 24 Z9 24 U1 0 U2 5 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 OCT 15 PY 1993 VL 90 IS 20 BP 9664 EP 9667 DI 10.1073/pnas.90.20.9664 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MC570 UT WOS:A1993MC57000090 PM 8415759 ER PT J AU PORTER, WD MAZIASZ, PJ AF PORTER, WD MAZIASZ, PJ TI THERMAL-EXPANSION DATA ON SEVERAL IRON-ALUMINIDE AND NICKEL-ALUMINIDE ALLOYS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP PORTER, WD (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. OI Maziasz, Philip/0000-0001-8207-334X NR 14 TC 27 Z9 27 U1 0 U2 6 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 OCT 15 PY 1993 VL 29 IS 8 BP 1043 EP 1048 DI 10.1016/0956-716X(93)90175-R PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LV343 UT WOS:A1993LV34300008 ER PT J AU CHAN, DK JANG, H SEIDMAN, DN MERKLE, KL AF CHAN, DK JANG, H SEIDMAN, DN MERKLE, KL TI INITIAL RESULTS ON THE AG/CDO (222) INTERFACE - ATOMIC-SCALE INTERFACIAL CHEMISTRY AND SEQUENCING OF ORDERED CADMIUM/OXYGEN PLANES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID RESOLUTION ELECTRON-MICROSCOPY; METAL CERAMIC INTERFACES; INTERNAL OXIDATION; SILVER ALLOYS; MGO; AG C1 NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP CHAN, DK (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Seidman, David/B-6697-2009 NR 35 TC 5 Z9 5 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 OCT 15 PY 1993 VL 29 IS 8 BP 1119 EP 1124 DI 10.1016/0956-716X(93)90188-X PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LV343 UT WOS:A1993LV34300021 ER PT J AU MACADAM, SS STRINGER, J AF MACADAM, SS STRINGER, J TI SOME EFFECTS OF BED PARTICLE PROPERTIES ON WEAR IN FLUIDIZED-BED COMBUSTORS SO WEAR LA English DT Article ID REINFORCED ALUMINUM-ALLOY AB Serious wear of in-bed heat exchanger tubes in bubbling fluidized-bed combustors often occurs as the result of periodic energetic impacts by large aggregates of bed particles on the underside of tubes. The resulting ''hammering'' effect is simulated in a specially designed laboratory wear rig by quickly driving a specimen rod downward within a bed of fluidized particles. In this study, some of the ways in which.bed particle properties influence wear in this environment are examined. Bed particles of three different compositions were used in separate wear tests on aluminum rods at room temperature. The wear rates and wastage distribution about the rod circumference were strongly influenced by the type of bed particles used. The dependence of wear on impact energy also differed markedly with the composition of the bed. The differences were primarily attributable to the nature and degree of the fine bed particle debris formed through comminution and how it is incorporated into the surface of the wearing rod. C1 ELECT POWER RES INST,PALO ALTO,CA 94304. RP MACADAM, SS (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 15 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD OCT 15 PY 1993 VL 169 IS 2 BP 141 EP 152 DI 10.1016/0043-1648(93)90291-S PG 12 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA ME379 UT WOS:A1993ME37900003 ER PT J AU LAVERNE, JA YOSHIDA, H AF LAVERNE, JA YOSHIDA, H TI PRODUCTION OF THE HYDRATED ELECTRON IN THE RADIOLYSIS OF WATER WITH HELIUM-IONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PULSE-RADIOLYSIS; AQUEOUS-SOLUTIONS; RADICALS; YIELDS; PICOSECONDS; PROTON; DECAY AB The scavenged yield of the hydrated electron has been determined in the radiolysis of water with 2-22-MeV helium ions by measuring the production of ammonia from glycylglycine. Glycylglycine concentrations were 1, 0.1, 0.01, and O.001 M, which correspond to hydrated electron lifetimes of 3 ns to 3 mus, respectively. Differential hydrated electron yields were obtained from the observed energy dependencies, and for 1 M glycylglycine they ranged from 1.76 to 3.09 molecules/100 eV for 5-20-MeV helium ions, respectively. These values are slightly larger than the corresponding integral yields of 1.51-2.20 molecules/100 eV, respectively, but smaller than the yield of 3.81 found with fast electrons. In 0.001 M glycylglycine solutions the integral scavenged yield of the hydrated electron varies less than 1% per MeV of helium ion energy. At this concentration it was found that for 5-MeV helium ions the differential hydrated electron yield was 0.145 and the integral yield was 0.098 molecules/100 eV. These values are substantially less than the value of 2.47 molecules/100 eV found with fast electrons indicating the importance of intratrack reactions with helium ions in the nanosecond to microsecond time scale. It appears that the scavenged yields of hydrated electrons approach constant values with decreasing glycylglycine concentration for all helium ion energies studied. These lower limits are considerably less than the scavenged yields of hydroxyl radicals previously determined in formic acid solutions of comparable scavenging capacity. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37830. RP LAVERNE, JA (reprint author), UNIV NOTRE DAME,RADIAT LAB,NOTRE DAME,IN 46556, USA. NR 33 TC 35 Z9 35 U1 1 U2 9 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 OCT 14 PY 1993 VL 97 IS 41 BP 10720 EP 10724 DI 10.1021/j100143a033 PG 5 WC Chemistry, Physical SC Chemistry GA MC031 UT WOS:A1993MC03100033 ER PT J AU BONHAM, RA INOKUTI, M BARBIERI, RS AF BONHAM, RA INOKUTI, M BARBIERI, RS TI ON THE SLOPE OF THE GENERALIZED OSCILLATOR STRENGTH IN THE LIMIT OF ZERO MOMENTUM-TRANSFER SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID ELECTRON-IMPACT; MOLECULES; NITROGEN; STATE AB The slope of the generalized oscillator strength in the limit as the momentum transfer, K, approaches zero contains information concerning the probability of certain nondipole transitions in atoms and molecules. Sum rules and bounds are explored in an attempt to interpret experimentally derived slopes in terms of the underlying physical processes. We also discuss the slope and related quantities calculated for atomic hydrogen, C1 INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. RP BONHAM, RA (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 25 TC 4 Z9 4 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 OCT 14 PY 1993 VL 26 IS 19 BP 3363 EP 3378 DI 10.1088/0953-4075/26/19/024 PG 16 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MC979 UT WOS:A1993MC97900024 ER PT J AU REINHOLD, CO MELLES, M SHAO, H BURGDORFER, J AF REINHOLD, CO MELLES, M SHAO, H BURGDORFER, J TI IONIZATION OF RYDBERG ATOMS BY HALF-CYCLE PULSES SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter ID QUANTUM-THEORY; COLLISIONS; HYDROGEN; CAPTURE; IONS AB We study the ionization of Rydberg atoms by half-cycle electromagnetic pulses as a function of the duration of the pulses covering a broad range of time intervals connecting the adiabatic and sudden regimes. We show that the threshold fields for ionization lie on a universal classical scaling invariant curve. We present quantum mechanical results which agree well with the universal curve. The n-2 threshold field scaling recently found experimentally is a linear approximation to the universal curve by the tangent in the region where the pulse duration is of the order of the orbital period of the atom. We predict the existence of an ultrashort pulse limit in which the threshold field scales as n-1. Effects due to non-hydrogenic core are shown to be negligible. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP REINHOLD, CO (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 19 TC 87 Z9 87 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 OCT 14 PY 1993 VL 26 IS 19 BP L659 EP L664 DI 10.1088/0953-4075/26/19/005 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MC979 UT WOS:A1993MC97900005 ER PT J AU ALCOCK, C AKERLOF, CW ALLSMAN, RA AXELROD, TS BENNETT, DP CHAN, S COOK, KH FREEMAN, KC GRIEST, K MARSHALL, SL PARK, HS PERLMUTTER, S PETERSON, BA PRATT, MR QUINN, PJ RODGERS, AW STUBBS, CW SUTHERLAND, W AF ALCOCK, C AKERLOF, CW ALLSMAN, RA AXELROD, TS BENNETT, DP CHAN, S COOK, KH FREEMAN, KC GRIEST, K MARSHALL, SL PARK, HS PERLMUTTER, S PETERSON, BA PRATT, MR QUINN, PJ RODGERS, AW STUBBS, CW SUTHERLAND, W TI POSSIBLE GRAVITATIONAL MICROLENSING OF A STAR IN THE LARGE MAGELLANIC CLOUD SO NATURE LA English DT Article ID DARK MATTER; GALAXY; MASS; HALO AB THERE is now abundant evidence for the presence of large quantities of unseen matter surrounding normal galaxies, including our own1,2. The nature of this 'dark matter' is unknown, except that it cannot be made of normal stars, dust or gas, as they would be easily detected. Exotic particles such as axions, massive neutrinos or other weakly interacting massive particles (collectively known as WIMPs) have been proposed3,4, but have yet to be detected. A less exotic alternative is normal matter in the form of bodies with masses ranging from that of a large planet to a few solar masses. Such objects, known collectively as massive compact halo objects5 (MACHOs), might be brown dwarfs or 'jupiters' (bodies too small to produce their own energy by fusion), neutron stars, old white dwarfs or black holes. Paczynski6 suggested that MACHOs might act as gravitational microlenses, temporarily amplifying the apparent brightness of background stars in nearby galaxies. We are conducting a microlensing experiment to determine whether the dark matter halo of our Galaxy is made up of MACHOs. Here we report a candidate for such a microlensing event, detected by monitoring the light curves of 1.8 million stars in the Large Magellanic Cloud for one year. The light curve shows no variation for most of the year of data taking, and an upward excursion lasting over 1 month, with a maximum increase of approximately 2 mag. The most probable lens mass, inferred from the duration of the candidate lensing event, is approximately 0.1 solar mass. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WESTON,ACT 2611,AUSTRALIA. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. RP ALCOCK, C (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Stubbs, Christopher/C-2829-2012; Perlmutter, Saul/I-3505-2015; OI Stubbs, Christopher/0000-0003-0347-1724; Perlmutter, Saul/0000-0002-4436-4661; Sutherland, William/0000-0002-6498-0437 NR 14 TC 631 Z9 637 U1 5 U2 14 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 14 PY 1993 VL 365 IS 6447 BP 621 EP 623 DI 10.1038/365621a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MB846 UT WOS:A1993MB84600049 ER PT J AU AHLUWALIA, DV JOHNSON, MB GOLDMAN, T AF AHLUWALIA, DV JOHNSON, MB GOLDMAN, T TI A BARGMANN-WIGHTMAN-WIGNER-TYPE QUANTUM-FIELD THEORY SO PHYSICS LETTERS B LA English DT Article ID KINEMATIC ACAUSALITY; ARBITRARY-SPIN; EQUATIONS AB We show that the (j, 0) + (0, j) representation space associated with massive particles is a concrete realisation of a quantum field theory, envisaged many years ago by Bargmann, Wightman and Wigner, in which bosons and antibosons have opposite relative intrinsic parities. Demonstration of the result requires a careful ab initio study of the (j, 0) + (0, j) representation space for massive particles, introducing a wave equation with well defined transformation properties under C, P and T, and addressing the issue of nonlocality required of such a theory by the work of Lee and Wick. C1 LOS ALAMOS NATL LAB, MED ENERGY PHYS THEORY GRP, LOS ALAMOS, NM 87545 USA. RP LOS ALAMOS NATL LAB, NUCL & PARTICLE PHYS RES GRP, MP-9, MS H-846, LOS ALAMOS, NM 87545 USA. NR 24 TC 65 Z9 65 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 OCT 14 PY 1993 VL 316 IS 1 BP 102 EP 108 DI 10.1016/0370-2693(93)90664-4 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MB279 UT WOS:A1993MB27900018 ER PT J AU KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS SMETANKA, JJ ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M TAJIMA, H YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M IKEGAMI, I KAZUNO, M NIU, E SHIBUYA, H WATANABE, S SATO, Y SESHIMO, M TEZUKA, I BAHK, SY KIM, SK AF KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS SMETANKA, JJ ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M TAJIMA, H YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M IKEGAMI, I KAZUNO, M NIU, E SHIBUYA, H WATANABE, S SATO, Y SESHIMO, M TEZUKA, I BAHK, SY KIM, SK TI SEARCH FOR DIFFRACTIVE CHARM PRODUCTION IN 800-GEV/C PROTON SILICON INTERACTIONS SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; EMULSION INTERACTIONS; ELASTIC-SCATTERING; JET FRAGMENTATION; MESON PRODUCTION; INTRINSIC CHARM; E+E-PHYSICS; STATES AB A search for charm production in the coherent diffractive dissociation reaction pSi-->XSi was carried out for the modes D0-->K-pi+, D0-->K-pi+pi+pi-, and D+-->K-pi+pi+. No charm signals were observed, and the 90% confidence level upper limit for coherent charm pair production was determined to be 26 mub per silicon nucleus. The results are interpreted as an upper limit of 0.2% on the amount of intrinsic charm in the proton. C1 UNIV CALIF DAVIS, DAVIS, CA 95616 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. CHONNAM NATL UNIV, KWANGJU 500757, SOUTH KOREA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. GIFU UNIV, GIFU 50111, JAPAN. GYEONGSANG NATL UNIV, JINJU 660300, SOUTH KOREA. KINKI UNIV, OSAKA, OSAKA 577, JAPAN. KOBE UNIV, KOBE 657, JAPAN. KOREA UNIV, SEOUL 136701, SOUTH KOREA. NAGOYA INST TECHNOL, NAGOYA, AICHI 466, JAPAN. NAGOYA UNIV, NAGOYA, AICHI 464, JAPAN. OHIO STATE UNIV, COLUMBUS, OH 43210 USA. OKAYAMA UNIV, OKAYAMA 700, JAPAN. UNIV OKLAHOMA, NORMAN, OK 73019 USA. OSAKA CITY UNIV, OSAKA 558, JAPAN. SCI EDUC INST OSAKA PREFECTURE, OSAKA 558, JAPAN. TOHO UNIV, FUNABASHI, CHIBA 274, JAPAN. UTSUNOMIYA UNIV, UTSUNOMIYA, TOCHIGI 321, JAPAN. WONKWANG UNIV, IRI 570749, SOUTH KOREA. RP KODAMA, K (reprint author), AICHI UNIV EDUC, KARIYA 448, JAPAN. RI Russ, James/P-3092-2014; Aoki, Shigeki/L-6044-2015 OI Russ, James/0000-0001-9856-9155; NR 34 TC 7 Z9 7 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 OCT 14 PY 1993 VL 316 IS 1 BP 188 EP 196 DI 10.1016/0370-2693(93)90678-B PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MB279 UT WOS:A1993MB27900032 ER PT J AU FRABETTI, PL PAOLONE, VS YAGER, PM BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP BUTLER, JN DAVENPORT, F GAINES, I GARBINCIUS, PH GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H BIANCO, S ENORINI, M FABBRI, FL SPALLONE, A ZALLO, A CULBERTSON, R JAROSS, G LINGEL, K SHELDON, PD WILSON, JR WISS, J ALIMONTI, G BELLINI, G DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CASTOLDI, C CLAES, D GOBBI, B OREILLY, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD GARDNER, RW KENNEDY, CJ MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD ZANABRIA, ME BOCA, G RATTI, SP VITULO, P LOPEZ, A AF FRABETTI, PL PAOLONE, VS YAGER, PM BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP BUTLER, JN DAVENPORT, F GAINES, I GARBINCIUS, PH GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H BIANCO, S ENORINI, M FABBRI, FL SPALLONE, A ZALLO, A CULBERTSON, R JAROSS, G LINGEL, K SHELDON, PD WILSON, JR WISS, J ALIMONTI, G BELLINI, G DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CASTOLDI, C CLAES, D GOBBI, B OREILLY, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD GARDNER, RW KENNEDY, CJ MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD ZANABRIA, ME BOCA, G RATTI, SP VITULO, P LOPEZ, A TI A MEASUREMENT OF ELASTIC J/PSI PHOTOPRODUCTION CROSS-SECTION AT FERMILAB-E687 SO PHYSICS LETTERS B LA English DT Article ID ENERGY; NEUTRINO AB Measurements of elastic photoproduction cross sections for the J/psi meson from 100 GeV to 37 5 GeV are presented. The results indicate that the cross section increases slowly in this range. The shape of the energy dependence agrees well with the photon-gluon fusion model prediction. C1 INFN,I-40126 BOLOGNA,ITALY. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. INFN,NAZL FRASCATI LAB,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR,I-27100 PAVIA,ITALY. INFN,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 24 TC 36 Z9 36 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 OCT 14 PY 1993 VL 316 IS 1 BP 197 EP 206 DI 10.1016/0370-2693(93)90679-C PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MB279 UT WOS:A1993MB27900033 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DABBOUS, H DESCH, K DIEKMANN, B DOEKER, T GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M BARILLARI, T SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L BEDNAREK, B BORZEMSKI, P ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GLASER, R GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A KROGER, W POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR, I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y AF DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DABBOUS, H DESCH, K DIEKMANN, B DOEKER, T GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M BARILLARI, T SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L BEDNAREK, B BORZEMSKI, P ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GLASER, R GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A KROGER, W POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR, I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI SEARCH FOR EXCITED ELECTRONS USING THE ZEUS DETECTOR SO PHYSICS LETTERS B LA English DT Article ID CENTRAL TRACKING DETECTOR; LUND MONTE-CARLO; JET FRAGMENTATION; LEPTON PRODUCTION; E+E-PHYSICS; Z0 DECAY; LIMITS; MUONS; E+E-->GAMMA-GAMMA; CALORIMETER AB This paper reports a search for excited electrons at the HERA electron-proton collider. In a sample corresponding to an integrated luminosity of 26 nb-1, no evidence was found for any resonant state decaying into e-gamma, nuW- or e-Z0. Limits on the coupling strength of an excited electron have been determined for masses between 45 and 225 GeV. This study also reports the observation of the wide-angle egamma Compton scattering process. C1 INFN,BOLOGNA,ITALY. UNIV BOLOGNA,I-40126 BOLOGNA,ITALY. IROE,FLORENCE,ITALY. UNIV BONN,INST PHYS,W-5300 BONN,GERMANY. UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALABRIA,DEPT PHYS,COSENZA,ITALY. INFN,COSENZA,ITALY. COLUMBIA UNIV,NEVIS LABS,IRVINGTON HUDSON,NY. INST NUCL PHYS,KRAKOW,POLAND. ACAD MINING & MET,FAC PHYS & NUCL TECHN,KRAKOW,POLAND. DESY,W-2000 HAMBURG 52,GERMANY. DESY ZEUTHEN,INST HOCHENERGIEPHYS,ZEUTHEN,GERMANY. INFN,FLORENCE,ITALY. UNIV FLORENCE,I-50121 FLORENCE,ITALY. INFN,NAZL FRASCATI LAB,FRASCATI,ITALY. UNIV FREIBURG,INST PHYS,W-7800 FREIBURG,GERMANY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HAMBURG,INST EXPTL PHYS 1,W-2000 HAMBURG 13,GERMANY. UNIV HAMBURG,INST EXPTL PHYS 2,W-2000 HAMBURG 13,GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,HIGH ENERGY NUCL PHYS GRP,LONDON SW7 2AZ,ENGLAND. UNIV IOWA HOSP & CLIN,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. FORSCHUNGSZENTRUM JULICH,INST KERNPHYS,JULICH,GERMANY. KOREA UNIV,SEOUL,SOUTH KOREA. LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803. UNIV AUTONOMA MADRID,DEPT FIS TEOR,MADRID 34,SPAIN. UNIV MANITOBA,DEPT PHYS,WINNIPEG R3T 2N2,MANITOBA,CANADA. MCGILL UNIV,DEPT PHYS,MONTREAL H3A 2T5,QUEBEC,CANADA. MOSCOW MV LOMONOSOV STATE UNIV,INST NUCL PHYS,MOSCOW,RUSSIA. NIKHEF,AMSTERDAM,NETHERLANDS. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. UNIV OXFORD,DEPT PHYS,OXFORD,ENGLAND. INFN,PADUA,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35100 PADUA,ITALY. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. INFN,ROME,ITALY. UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS,I-00185 ROME,ITALY. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV GESAMTHSCH SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN 21,GERMANY. TEL AVIV UNIV,SCH PHYS,IL-69978 TEL AVIV,ISRAEL. UNIV TOKYO,INST NUCL STUDY,TOKYO 113,JAPAN. TOKYO METROPOLITAN UNIV,DEPT PHYS,TOKYO 158,JAPAN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10124 TURIN,ITALY. INFN,TURIN,ITALY. UNIV TORINO,FAC SCI,ALESSANDRIA,ITALY. INFN,TURIN,ITALY. UNIV TORONTO,DEPT PHYS,TORONTO M5S 1A1,ONTARIO,CANADA. UNIV COLL HOSP LONDON,DEPT PHYS & ASTRON,WC1 LONDON,ENGLAND. VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. UNIV WARSAW,INST EXPTL PHYS,PL-00325 WARSAW,POLAND. INST NUCL RES,PL-00681 WARSAW 91,POLAND. WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. YORK UNIV,DEPT PHYS,N YORK M3J 1P3,ONTARIO,CANADA. RP DERRICK, M (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Guida, MIchele/J-4714-2012; Wiggers, Leo/B-5218-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008 OI Brook, Nicholas/0000-0002-1818-0113; Levi, Giuseppe/0000-0003-1714-6359; Doyle, Anthony/0000-0001-6322-6195; Guida, MIchele/0000-0002-1108-5391; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Castellini, Guido/0000-0002-0177-0643; Anzivino, Giuseppina/0000-0002-5967-0952; iori, maurizio/0000-0002-6349-0380; Lancaster, Mark/0000-0002-8872-7292; Chwastowski, Janusz/0000-0002-6190-8376; De Pasquale, Salvatore/0000-0001-9236-0748; NR 67 TC 14 Z9 14 U1 0 U2 3 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 OCT 14 PY 1993 VL 316 IS 1 BP 207 EP 218 DI 10.1016/0370-2693(93)90680-G PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MB279 UT WOS:A1993MB27900034 ER PT J AU HUSTON, P ESPENSON, JH BAKAC, A AF HUSTON, P ESPENSON, JH BAKAC, A TI METHYLTRIOXORHENIUM-CATALYZED OXIDATION OF A (THIOLATO)COBALT(III) COMPLEX BY HYDROGEN-PEROXIDE SO INORGANIC CHEMISTRY LA English DT Article ID MAIN-GROUP ELEMENTS; COORDINATED SULFENIC ACIDS; TRANSITION-METALS; MULTIPLE BONDS; MECHANISM; KINETICS; BIS(ETHYLENEDIAMINE)COBALT(III); MOLYBDENUM(VI); THIOETHER AB The oxidation of (en)2Co(SCH2CH2NH2)2+ by H2O2 is catalyzed by CH3ReO3. Studies of the kinetics and mechanism were carried out in aqueous solutions of dilute perchloric acid. The (thiolato)cobalt(III) complex is oxidized first to a sulfenato complex, (en)2Co(S(O)CH2CH2NH2)2+, which is in turn more slowly oxidized to the sulfinato complex, (en)2Co(S(O)2CH2CH2NH2)2+. The two steps are well resolved in time, the second being some 1500 times slower than the first. Both steps fit the same kinetic pattern, which is consistent with a Michaelis-Menten scheme in which there are two substrates. This scheme involves the reversible formation of a 1:1 H2O2/CH3ReO3 adduct (A). The reversible formation of a 2:1 H2O2/CH3ReO3 adduct (B) also occurs, but it appears to be a dead-end process, in that B, if involved at all, is much less reactive than A. Rate constants were determined at 25-degrees-C, mu = 0.10 M (HClO4), for the formation of the 1:1 H2O2/CH3ReO3 adduct A (k1 = 77 +/- 1 L mol-1 s-1) and its dissociation (k-1 = 9.0 +/- 0.5 s-1) and for the oxidation by A of the thiolato complex, (4.2 +/- 0.3) X 10(5) L mol-1 s-1, and of the sulfenato complex, 265 +/- 7 L mol-1 s-1. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 25 TC 67 Z9 67 U1 0 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 OCT 13 PY 1993 VL 32 IS 21 BP 4517 EP 4523 DI 10.1021/ic00073a009 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA MC686 UT WOS:A1993MC68600009 ER PT J AU DOWELL, DH DAVIS, KJ FRIDDELL, KD TYSON, EL LANCASTER, CA MILLIMAN, L RODENBURG, RE AAS, T BEMES, M BETHEL, SZ JOHNSON, PE MURPHY, K WHELEN, C BUSCH, GE REMELIUS, DK AF DOWELL, DH DAVIS, KJ FRIDDELL, KD TYSON, EL LANCASTER, CA MILLIMAN, L RODENBURG, RE AAS, T BEMES, M BETHEL, SZ JOHNSON, PE MURPHY, K WHELEN, C BUSCH, GE REMELIUS, DK TI 1ST OPERATION OF A PHOTOCATHODE RADIO-FREQUENCY GUN INJECTOR AT HIGH DUTY FACTOR SO APPLIED PHYSICS LETTERS LA English DT Article ID FREE-ELECTRON LASER; PHOTOINJECTOR; SIMULATION AB Tests of the electron beam injector for the Boeing/Los Alamos Average Power Laser Experiment have demonstrated first time operation of a photocathode radio frequency gun accelerator at 25% duty factor, exceeding previous photocathode operating parameters by three orders of magnitude. The macropulse format was 30 Hz and 8.3 ms with a micropulse frequency of 27 MHz. Average beam currents of up to 32 mA have been accelerated to 5 MeV for an average beam power of 160 kW. The macropulse peak current was 128 mA. The 32 mA average beam current exceeds previous cathode performance by a factor of 1000. Emittance measurements demonstrate excellent electron beam quality. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DOWELL, DH (reprint author), BOEING DEF & SPACE GRP,SEATTLE,WA 98124, USA. NR 15 TC 43 Z9 44 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 OCT 11 PY 1993 VL 63 IS 15 BP 2035 EP 2037 DI 10.1063/1.110583 PG 3 WC Physics, Applied SC Physics GA MA977 UT WOS:A1993MA97700008 ER PT J AU CHAIKEN, A TERMINELLO, LJ WONG, J DOLL, GL TAYLOR, CA AF CHAIKEN, A TERMINELLO, LJ WONG, J DOLL, GL TAYLOR, CA TI ELECTRONIC AND ATOMIC-STRUCTURE OF METASTABLE PHASES OF BORON-NITRIDE USING CORE-LEVEL PHOTOABSORPTION SO APPLIED PHYSICS LETTERS LA English DT Article ID FILMS; BN; DEPOSITION AB Soft x-ray core-level photoabsorption has been measured from three forms of boron nitride, namely the hexagonal (hBN), cubic (cBN), and incoherent (iBN) phases. The B 1s and N 1s photoabsorption spectra of the hBN sample show evidence of both sigma*- and pi*-empty states, indicative of sp2 bonding, while the cBN absorption spectra exhibits only sp3 bonding in absorption features characteristic of the zincblende structure. The incoherent phase of BN in the form of a thin film on a Si substrate possesses sigma* and pi* states similar to hBN. The B 1s pi* absorption features of the iBN film show an angular dependence which suggests that the microstructure consists of hexagonal-phase layer planes oriented normal to the BN/Si interface. C1 GM CORP,RES LAB,DEPT PHYS,WARREN,MI 48090. RP CHAIKEN, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 10 TC 33 Z9 34 U1 1 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 OCT 11 PY 1993 VL 63 IS 15 BP 2112 EP 2114 DI 10.1063/1.110556 PG 3 WC Physics, Applied SC Physics GA MA977 UT WOS:A1993MA97700034 ER PT J AU THUNDAT, T ZHENG, XY CHEN, GY SHARP, SL WARMACK, RJ SCHOWALTER, LJ AF THUNDAT, T ZHENG, XY CHEN, GY SHARP, SL WARMACK, RJ SCHOWALTER, LJ TI CHARACTERIZATION OF ATOMIC-FORCE MICROSCOPE TIPS BY ADHESION FORCE MEASUREMENTS SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULES; CRYSTALS AB The resolution limit in an atomic force microscope image usually is attributed to the finite radius of the contacting probe. Here, it is shown that this assumption is valid only when adhesion forces are minimal. Relative to the tip-imposed geometrical limit, the resolution and contrast in AFM images can be degraded by increasing adhesion forces. The large adhesion forces observed for some tips at low humidity conditions are shown to be due to tip contamination or poorly formed tip apexes. Methods to determine and to reduce the extent of tip contamination are described. Cleaning carried out using UV-ozone or oxygen-plasma etching were found to significantly reduce the minimum adhesion force. C1 RENSSELAER POLYTECH INST,CTR INTEGRATED ELECTR,TROY,NY 12180. RENSSELAER POLYTECH INST,DEPT PHYS,TROY,NY 12180. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 20 TC 69 Z9 69 U1 1 U2 9 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 OCT 11 PY 1993 VL 63 IS 15 BP 2150 EP 2152 DI 10.1063/1.110569 PG 3 WC Physics, Applied SC Physics GA MA977 UT WOS:A1993MA97700047 ER PT J AU PANG, Y IJADIMAGHSOODI, S BARTON, TJ AF PANG, Y IJADIMAGHSOODI, S BARTON, TJ TI CATALYTIC SYNTHESIS OF SILYLENE VINYLENE PRECERAMIC POLYMERS FROM ETHYNYLSILANES SO MACROMOLECULES LA English DT Article ID POLYCARBOSILANE MODELS AB Catalytic hydrosilylation of diorganoethynylsilanes, R2HSiC=CH, with H2PtCl6 cleanly affords soluble poly(silylenevinylenes), -(R2SiCH=CH)n-, which were characterized by H-1 NMR, C-13 NMR, Si-29 NMR, FT-IR, GPC, and TGA. Bulk pyrolysis of these polymers under an inert atmosphere at temperatures above 1100-degrees-C resulted in the formation of silicon carbide powders as characterized by X-ray diffraction spectra. Melt-spun fibers from these polymers were surface cross-linked and then thermally converted to SiC fibers with a dense surface microstructure. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. NR 26 TC 73 Z9 76 U1 1 U2 24 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD OCT 11 PY 1993 VL 26 IS 21 BP 5671 EP 5675 DI 10.1021/ma00073a021 PG 5 WC Polymer Science SC Polymer Science GA MC071 UT WOS:A1993MC07100021 ER PT J AU MOODY, KJ LOUGHEED, RW WILD, JF DOUGAN, RJ HULET, EK HOFF, RW HENDERSON, CM DUPZYK, RJ HAHN, RL SUMMERER, K OKELLEY, GD BETHUNE, GR AF MOODY, KJ LOUGHEED, RW WILD, JF DOUGAN, RJ HULET, EK HOFF, RW HENDERSON, CM DUPZYK, RJ HAHN, RL SUMMERER, K OKELLEY, GD BETHUNE, GR TI DECAY PROPERTIES OF HEAVY MENDELEVIUM ISOTOPES SO NUCLEAR PHYSICS A LA English DT Review ID FISSION HALF-LIVES; EXCITATION-FUNCTIONS; CROSS-SECTIONS; ALPHA-DECAY; ACTINIDES; CM-248; MD-260; FM-258; NUCLEI; ES-254 AB We investigated the nuclear properties of several mendelevium isotopes produced in the reactions of heavy ions with Es-254(g). We measured the alpha particles, spontaneous fissions (SF), and photons emitted by counting samples resulting from chemical and/or mass separations. The Md-256 half-life is (78.1 +/- 1.8) min; it decays primarily by electron capture (EC), but also by alpha emission (11 +/- 3)% of the time. The Md-256 ground state has J less-than-or-equal-to 2 (probably J(pi) = 1-), and a mass ''cess of (87.611 +/- 0.053) MeV. The Md-257 half-life is (5.523 +/- 0.050) h; it decays primarily by EC, but also by alpha emission (15.2 +/- 2.6)% of the time and by SF less than 1% of the time. The Md-257 mass excess is (88.989 +/- 0.003) MeV. The Md-258(g) (j(pi) = 8-) half-life is (51.50 +/- 0.29) d. It decays by alpha emission; the sum of SF, EC, and beta- decay branches is less than 3 x 10(-3) %. The alpha decay of Md-258(g) populates Es-254(m) (0.60 +/- 0.08)% of the time. The Md-(258) mass excess is (91.691 +/- 0.007) MeV. The half-life of J(pi) = 1- Md-258(m) is (57.0 +/- 0.9) min. It decays by EC; the branch for decay by alpha emission is less than 1.2%. The sum of SF and beta- decay branches is less than 30%. The half-life of Md-259 is (1.60 +/- 0.06) h; it decays primarily by SF. The alpha decay branch of Md-259 is less than 1.3%. From the Md-259 half-life we calculated a SF hindrance factor associated with the 7/2-[514] proton configuration of 3.6 x 10(6). From our data we proposed partial level schemes for Es-252, Es-253, and Es-254. RP MOODY, KJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 129 TC 20 Z9 20 U1 2 U2 3 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 OCT 11 PY 1993 VL 563 IS 1 BP 21 EP 73 DI 10.1016/0375-9474(93)90010-U PG 53 WC Physics, Nuclear SC Physics GA MC669 UT WOS:A1993MC66900002 ER PT J AU BATKO, G RANDRUP, J AF BATKO, G RANDRUP, J TI BUU DYNAMICS OF UNBOUND SPHERICAL NUCLEI SO NUCLEAR PHYSICS A LA English DT Article ID HARTREE-FOCK APPROXIMATION; HEAVY-ION COLLISIONS; STATISTICAL MULTIFRAGMENTATION; EXCITED NUCLEI; MODEL; FRAGMENTATION; EVOLUTION; HOT; INSTABILITIES; FLUCTUATIONS AB Within the nuclear Boltzmann-Uhling-Uhlenbeck model, we investigate the dynamical evolution of spherical calcium and gold nuclei that have been agitated into unbound configurations by either compression or heating. Using a modified pseudo-particle method that preserves the spherical symmetry, we find that the conversion of the compressional energy into radial motion is only weakly dissipative and, remarkably, for a range of initial compressions between density doubling and tripling the nucleus expands to a quasi-stationary unstable bubble-like configuration. The same processes are also studied with the standard method of solution in which perfect symmetry is absent and it is shown that while the bubbles then cluserize into bound fragments, the qualitative character of the outcome is different and sensitive to the employed number of pseudo-particles per nucleon, a purely numerical parameter. Our studies suggest that for suitable initial compressions there exists a specific nuclear multifragmentation process in which the decompression leads to an unstable hollow configuration that subsequently clusterizes into massive fragments. C1 LAWRENCE BERKELEY LAB, DIV MED BIOPHYS, 70A-3307, BERKELEY, CA 94720 USA. GESELL SCHWERIONENFORSCH MBH, W-6100 DARMSTADT 11, GERMANY. NR 27 TC 21 Z9 21 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 OCT 11 PY 1993 VL 563 IS 1 BP 97 EP 128 DI 10.1016/0375-9474(93)90012-M PG 32 WC Physics, Nuclear SC Physics GA MC669 UT WOS:A1993MC66900004 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A 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 BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A 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 BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF BOTTOM QUARK PRODUCTION IN 1.8 TEV P(P)OVER-BAR COLLISIONS USING MUONS FROM B-QUARK DECAYS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRONIC COLLISIONS; CROSS-SECTION; BEAUTY PRODUCTION; PBARP COLLISIONS; E+E ANNIHILATION; HEAVY; COLLIDER; MASS; QCD AB We present a measurement of the b-quark cross section in 1.8 TeV p-pBAR collisions recorded with the Collider Detector at Fermilab using muonic b-quark decays. In the central rapidity region (\y(b)\ < 1.0), the cross section is 295 +/- 21 +/- 75 nb (59 +/- 14 +/- 15 nb) for p(T)b > 21 GeV/c (29 GeV/c). Comparisons are made to previous measurements and next-to-leading order QCD calculations. C1 UNIV PENN,PHILADELPHIA,PA 19104. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. DUKE UNIV,DURHAM,NC 27706. UNIV TORONTO,TORONTO M5S 1A1,ONTARIO,CANADA. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T5,QUEBEC,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. MIT,CAMBRIDGE,MA 02139. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV PITTSBURGH,PITTSBURGH,PA 15260. ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. ROCKEFELLER UNIV,NEW YORK,NY 10021. UNIV ROCHESTER,ROCHESTER,NY 14627. RUTGERS UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV WISCONSIN,MADISON,WI 53706. TUFTS UNIV,MEDFORD,MA 02155. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RI St.Denis, Richard/C-8997-2012; 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 24 TC 85 Z9 85 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 OCT 11 PY 1993 VL 71 IS 15 BP 2396 EP 2400 DI 10.1103/PhysRevLett.71.2396 PG 5 WC Physics, Multidisciplinary SC Physics GA MA962 UT WOS:A1993MA96200012 ER PT J AU CHUMAKOV, AI SMIRNOV, GV BARON, AQR ARTHUR, J BROWN, DE RUBY, SL BROWN, GS SALASHCHENKO, NN AF CHUMAKOV, AI SMIRNOV, GV BARON, AQR ARTHUR, J BROWN, DE RUBY, SL BROWN, GS SALASHCHENKO, NN TI RESONANT DIFFRACTION OF SYNCHROTRON-RADIATION BY A NUCLEAR MULTILAYER SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM BEATS; FILMS AB We report the observation of nuclear resonant diffraction of synchrotron radiation by a synthetic multilayer. The nuclear period of the [Fe-57(22 angstrom)/Sc(11 angstrom)/Fe(22 angstrom)/Sc(11 angstrom)] x 25 multilayer was chosen to be twice the electronic period to obtain a pure nuclear.Bragg reflection. Strong enhancement of the radiative scattering channel provided a fast time response for the Fe-57 resonant scattering at the Bragg peak, with a decay time of 4 ns. The nuclear multilayer will be useful as a narrow bandpass monochromator for synchrotron radiation. C1 STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RAS,INST APPL PHYS,NIZHNII NOVGOROD 603600,RUSSIA. UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064. RP CHUMAKOV, AI (reprint author), IV KURCHATOV INST,RUSSIAN RES CTR,MOSCOW 123182,RUSSIA. NR 25 TC 57 Z9 58 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 OCT 11 PY 1993 VL 71 IS 15 BP 2489 EP 2492 DI 10.1103/PhysRevLett.71.2489 PG 4 WC Physics, Multidisciplinary SC Physics GA MA962 UT WOS:A1993MA96200035 ER PT J AU DURHAM, WB KIRBY, SH STERN, LA AF DURHAM, WB KIRBY, SH STERN, LA TI FLOW OF ICES IN THE AMMONIA-WATER SYSTEM SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID PLANETOLOGICAL APPLICATIONS; SATELLITES; LITHOSPHERE; VOLCANISM; ENCELADUS; MIRANDA; LIQUID; STATE AB We have fabricated in the laboratory and subsequently deformed crystalline hydrates and partial melts of the water-rich end of the NH3-H2O system, with the aim of improving our understanding of physical processes occurring in icy moons of the outer solar system. Deformation experiments were carried out at constant strain rate. The range of experimental variables was strain rate 3.5 x 10(-7) < epsilon < 3.5 x 10(-4) s-1, temperature 132 < T < 220 K, pressure 50 less-than-or-equal-to P less-than-or-equal-to 100 MPa, and mole fraction NH3 0 less-than-or-equal-to X(NH3) less-than-or-equal-to 0.295. Phase relationships in the NH3-H2O system indicate that water ice and ammonia dihydrate, NH3 . 2H2O, are the stable phases under our experimental conditions. X ray diffraction of our samples usually revealed these as the dominant phases, but we have also observed an amorphous phase (in unpressurized samples only) and occasionally significant ammonia monohydrate, NH3 . H2O. The onset of partial melting at the peritectic temperature at about 176 K appeared as a sharp transition in strength observed in samples Of X(NH3) = 0.15 and 0.295. In samples Of x(NH3) = 0.05 and 0.01, the effect of melt was less pronounced. For any given water ice + dihydrate alloy in 'the subsolidus region, we observed one rheological law over the entire temperature range from 176 K to about 140 K. Below 140 K, a shear instability similar to that occurring in pure water ice under the same conditions limited our ability to measure ductile flow. The rheological laws for the several alloys vary systematically from that of pure ice to that of dihydrate. Pure dihydrate is about 4 orders of magnitude less viscous than water ice just below the peritectic temperature, but because of a very pronounced temperature dependence in dihydrate (100 kJ/mol versus 43 kJ/mol for water ice) the viscosity of dihydrate equals or exceeds that of water ice at T < 140 K. The large variation in viscosity of dihydrate with relatively small changes in temperature may be helpful in explaining the rich variety of tectonic and volcanic features seen on the surfaces of icy moons in the outer solar system. C1 US GEOL SURVEY,MENLO PK,CA 94025. RP DURHAM, WB (reprint author), LAWRENCE LIVERMORE NATL LAB,L-201,BOX 808,LIVERMORE,CA 94550, USA. NR 31 TC 43 Z9 44 U1 1 U2 7 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 OCT 10 PY 1993 VL 98 IS B10 BP 17667 EP 17682 DI 10.1029/93JB01564 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MC439 UT WOS:A1993MC43900004 ER PT J AU FOXALL, W MICHELINI, A MCEVILLY, TV AF FOXALL, W MICHELINI, A MCEVILLY, TV TI EARTHQUAKE TRAVEL-TIME TOMOGRAPHY OF THE SOUTHERN SANTA-CRUZ MOUNTAINS - CONTROL OF FAULT RUPTURE BY LITHOLOGICAL HETEROGENEITY OF THE SAN-ANDREAS FAULT ZONE SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Review ID 1989 LOMA-PRIETA; 3-DIMENSIONAL VELOCITY STRUCTURE; CALIFORNIA COAST-RANGES; STRIKE-SLIP FAULTS; CRUSTAL STRUCTURE; SUBDUCTION-ZONE; ASPERITY INDENTATION; THRUST EARTHQUAKES; WAVE VELOCITIES; ROCK FRICTION AB The 1989 Loma Prieta earthquake occurred along the stretch of the San Andreas fault zone within the southern Santa Cruz Mountains that last failed as a major earthquake in 1906. The southeastern end of the 1989 rupture marks the transition from stable, aseismic slip on the central creeping section of the San Andreas fault to unstable failure on the locked 1906 segment. We investigate this transition and the rupture characteristics of the 1989 earthquake using a three-dimensional P wave velocity model of the southern Santa Cruz Mountains section of the fault zone. The velocity model was determined by joint progressive inversion of 5422 P wave arrival times from 173 earthquakes, which included aftershocks of the 1989 earthquake and premainshock ''background'' events, recorded by the U.S. Geological Survey central California network. This velocity model was used to relocate 424 background earthquakes, the Loma Prieta mainshock, and 292 aftershocks. The velocity model is calibrated in terms of lithology using laboratory data for California Coast Ranges rock types and available seismic refraction profiles and is shown to be in good agreement with the surface geology. The model images a large anomalous high-velocity body at midcrustal depths within the rupture zone of the 1989 earthquake that the available evidence suggests might have gabbroic or other mafic composition. On the basis of the relationship of the lithological features interpreted from the velocity model to the seismicity and surface creep we propose a model in which the high-velocity body is primarily responsible for the transition from stable to unstable fault slip at Pajaro Gap. The active plane of the San Andreas fault cuts throughout the body. The fault system attempts to circumvent this barrier by transferring slip to secondary faults, including splay faults that have propagated along the frictionally favorable contact between the high-velocity rock mass and Franciscan country rocks. However, the near arrest of stable sliding causes stress to concentrate within the body, and the high-strength, unstable contact within it evolves from a barrier to the asperity that failed in the 1989 earthquake. The general features of the 1989 rupture predicted by this asperity model agree with several rupture histories computed for the earthquake. The model implies that as proposed by other workers, the Loma Prieta earthquake did not involve a repeat of the 1906 slip, which has an important bearing on earthquake recurrence estimates for the Santa Cruz Mountains segment of the fault. C1 UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,SEISMOG STN,BERKELEY,CA 94720. RP FOXALL, W (reprint author), LAWRENCE BERKELEY LAB,CTR COMPUTAT SEIMOL,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 110 TC 39 Z9 39 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 OCT 10 PY 1993 VL 98 IS B10 BP 17691 EP 17710 DI 10.1029/93JB01424 PG 20 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MC439 UT WOS:A1993MC43900006 ER PT J AU GARDIN, DE BATTEAS, JD VANHOVE, MA SOMORJAI, GA AF GARDIN, DE BATTEAS, JD VANHOVE, MA SOMORJAI, GA TI CARBON, NITROGEN, AND SULFUR ON NI(111) - FORMATION OF COMPLEX STRUCTURES AND CONSEQUENCES FOR MOLECULAR DECOMPOSITION SO SURFACE SCIENCE LA English DT Article ID SURFACE; NICKEL; RECONSTRUCTION; CHEMISORPTION; NI(100); LEED AB The decomposition of simple amines on Ni(III) produces a c(5 square-root 3 x 9)rect LEED pattern similar to the one reported earlier after reaction of H2S, C2H4, CO, NO and CH3CN on a Ni(111) surface. We have measured LEED IV curves of the structure obtained after deposition of carbon and nitrogen on a Ni(111) surface. The similarity between these IV curves shows that carbon and nitrogen have similar local geometries. The most intense spots of the c(5 square-root 3 x 9)rect LEED pattern are explained by the formation of a (100) orientation nickel monolayer, with the carbon or nitrogen atoms in the 4-fold hollow sites. This is supported by the qualitative similarity of the IV curves with those of the Ni(100)-(2 x 2)-2C structure. We have also produced a (2 x 6) nitrogen induced structure on Ni(111) and compared it to the very similar (5 square-root 3 x 2)rect structure obtained by adsorption of sulfur on Ni(111) that has also been interpreted as due to a (100) reconstruction of the Ni(111) crystal surface. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP GARDIN, DE (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 21 TC 42 Z9 42 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 10 PY 1993 VL 296 IS 1 BP 25 EP 35 DI 10.1016/0039-6028(93)90138-A PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MA842 UT WOS:A1993MA84200007 ER PT J AU RODACH, T BOHNEN, KP HO, KM AF RODACH, T BOHNEN, KP HO, KM TI 1ST PRINCIPLES CALCULATIONS OF SURFACE PHONONS FOR CU(110) SO SURFACE SCIENCE LA English DT Article ID AL(110) SURFACE; SCATTERING; MODES; CRYSTAL AB Using first principles total energy calculations, surface inter- and intraplaner force constants could be determined for a number of high symmetry points in the surface Brillouin zone. These force constants allowed for the parameterfree determination of the eigenmodes and frequencies of surface phonons at X, Y and S points. Results are in good agreement with available data. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. RP KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH, INST NUKL FESTKORPERPHYS, POSTFACH 3640, D-76021 KARLSRUHE, GERMANY. NR 29 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD OCT 10 PY 1993 VL 296 IS 1 BP 123 EP 129 DI 10.1016/0039-6028(93)90146-B PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MA842 UT WOS:A1993MA84200015 ER PT J AU MA, ZX LIAO, CL YIN, HM NG, CY CHIU, SW MA, NL LI, WK AF MA, ZX LIAO, CL YIN, HM NG, CY CHIU, SW MA, NL LI, WK TI EXPERIMENTAL AND THEORETICAL-STUDIES OF ISOMERIC C2H5S AND C2H5S+ SO CHEMICAL PHYSICS LETTERS LA English DT Article ID VACUUM ULTRAVIOLET PHOTODISSOCIATION; 193 NM PHOTODISSOCIATION; PHOTOIONIZATION; ENERGIES; CH3S; CH2SH+ AB By combining photoionization and photodissociation measurements with ab initio Gaussian-2 (G2) calculations on the C2H5S and C2H5S+ system, we have concluded that CH3CH2S is the dominant primary product formed in the 193 nm photodissociation of (CH3CH2)2S, while CH3CHSH+ is the product ion formed at the photoionization onset of C2H5S+ from (CH3CH2)2S. The G2 predictions for the heats of formation at 0 K (DELTAH(f0)) for the isomers of C2H5S and C2H5S+ (CH3CH2S: DELTAH(f0)(G2) = 27.5 kcal/mol; CH3SCH2: DELTA(Hf0)(G2) = 37.3 kcal/mol; CH3CH2S+: DELTAH(f0)(G2) = 236.5 kcal/mol; CH3CHSH+: DELTAH(f0)(G2) = 192.6 kcal/mol; and CH3SCH2+: DELTAH(f0)(G2) = 195.3 kcal/mol) are in agreement with available experimental DELTAH(f0) values (CH3CH2S: DELTAH(f0)(exp) = 31.4+/-2 kcal/mol; CH3SCH2: DELTAH(f0)/(exp) = 34.8+/-2.5 kcal/mol; CH3CH2S+: DELTAH(f0)(exp) = 238.3+/-2 kcal/mol; CH3CHSH+: DELTAH(f0)(exp) = 189.6+/-1.0 kcal/mol; and CH3SCH2+: DELTAH(f0)(exp) = 195.1 kcal/mol). The G2 calculation also yields a value of 35.3 kcal/mol for DELTAH(f0)(CH3CHSH). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. UNIV ILLINOIS,CTR BIOTECHNOL,URBANA,IL 61801. UNIV ILLINOIS,NATL CTR SUPERCOMP APPL,CHAMPAIGN,IL 61820. CHINESE UNIV HONG KONG,DEPT CHEM,SHA TIN,HONG KONG. DALIAN INST CHEM PHYS,DALIAN,PEOPLES R CHINA. RP MA, ZX (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 22 TC 47 Z9 47 U1 0 U2 0 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 OCT 8 PY 1993 VL 213 IS 3-4 BP 250 EP 256 DI 10.1016/0009-2614(93)85128-B PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MA390 UT WOS:A1993MA39000007 ER PT J AU MA, ZL LIU, KP AF MA, ZL LIU, KP TI COLLISION-INDUCED FINE-STRUCTURE TRANSITION OF O(P-3(2))-]O(P-3(1,0)) BY HE AND H-2 - EXCITATION-FUNCTION AND BRANCHING RATIO SO CHEMICAL PHYSICS LETTERS LA English DT Article ID OPEN-SHELL SYSTEMS; QUANTUM-MECHANICAL TREATMENT; INTEGRAL CROSS-SECTIONS; STATE ATOM COLLISIONS; INELASTIC-SCATTERING; WEAK-INTERACTIONS; MOLECULAR-BEAM; DEPENDENCE AB The intramultiplet mixing processes of the electronic ground state of oxygen atoms with He and H-2 have been studied experimentally at the state-to-state integral cross section level of detail. Excellent agreement with the recent quantum-mechanical close-coupling calculations based on the ab initio potential curves was found, both in terms of excitation functions and branching ratios. The result also gives strong indication for the validity of OMEGA-conserving approximation in the theoretical treatment of these two systems. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Liu, Kopin/F-7929-2012 NR 16 TC 15 Z9 15 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 OCT 8 PY 1993 VL 213 IS 3-4 BP 269 EP 274 DI 10.1016/0009-2614(93)85131-7 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MA390 UT WOS:A1993MA39000010 ER PT J AU SCHAPHORST, SJ CALDWELL, CD KRAUSE, MO JIMENEZMIER, J AF SCHAPHORST, SJ CALDWELL, CD KRAUSE, MO JIMENEZMIER, J TI EVIDENCE FOR ATOMIC FEATURES IN THE DECAY OF RESONANTLY EXCITED MOLECULAR-OXYGEN SO CHEMICAL PHYSICS LETTERS LA English DT Article ID HIGH-RESOLUTION; PHOTOELECTRON-SPECTROSCOPY; ELECTRON-IMPACT; AUGER-ELECTRON; O2; SPECTRA; CHANNELS; O-2; CO; STATES AB Resonance K auger spectra of molecular oxygen are presented at photon energies corresponding to 1simga --> 1pi(g)(pi*), 3sigma(u)(sigma*), and Rydberg excitations. Atomic-like Auger lines observed in the 3sigma(u)(sigma*) decay spectrum are compared with the pure atomic 1s --> 2p resonance Auger spectrum, and evidence for very fast neutral dissociation is found. The energy shifts of''spectator'' lines in the spectra measured at different excitation energies are discussed and compared with the normal O2 K Auger spectrum. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NATL AUTONOMOUS UNIV MEXICO,INST CIENCIAS NUCL,MEXICO CITY 04510,DF,MEXICO. RP SCHAPHORST, SJ (reprint author), UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816, USA. RI Jimenez-Mier, Jose/A-5081-2009 OI Jimenez-Mier, Jose/0000-0002-5939-9568 NR 30 TC 43 Z9 43 U1 2 U2 6 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 OCT 8 PY 1993 VL 213 IS 3-4 BP 315 EP 320 DI 10.1016/0009-2614(93)85138-E PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MA390 UT WOS:A1993MA39000017 ER PT J AU HENDERSON, CC ROHLFING, CM CAHILL, PA AF HENDERSON, CC ROHLFING, CM CAHILL, PA TI THEORETICAL-STUDIES OF SELECTED C60H2 AND C70H2 ISOMERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SEMIEMPIRICAL CALCULATIONS AB Semi-empirical MNDO methods predict that 2 of 23 structurally distinct C60H2 isomers and 4 of 143 C70H2 isomers have particularly low heats of formation. These isomers represent either 1,2-addition across a 6:6-ring fusion or 1,4-addition across a 6-ring, with both hydrogens externally bound. Fully optimized ab initio structures are computed for these low-lying isomers at the Hartree-Fock level using 3-2 1 G and 6-3 1 G* basis sets. For C60H2, all three methods agree on the isomer ordering, and the lowest energy structure is also the only one that has been observed experimentally. The energy separations among the lowest four C70H2 isomers are found to be quite small, but only the ab initio ordering is consistent with experimental results. C1 SANDIA NATL LABS,DEPT COMBUST CHEM,LIVERMORE,CA 94551. RP HENDERSON, CC (reprint author), SANDIA NATL LABS,DEPT CHEM ORGAN MAT,ALBUQUERQUE,NM 87185, USA. NR 16 TC 84 Z9 84 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 8 PY 1993 VL 213 IS 3-4 BP 383 EP 388 DI 10.1016/0009-2614(93)85150-M PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MA390 UT WOS:A1993MA39000029 ER PT J AU PETERSEN, BL TERMINELLO, LJ BARTON, JJ SHIRLEY, DA AF PETERSEN, BL TERMINELLO, LJ BARTON, JJ SHIRLEY, DA TI PHOTOELECTRON HOLOGRAPHY OF PT(111) AT 351 EV SO CHEMICAL PHYSICS LETTERS LA English DT Article ID EXTENDED-FINE-STRUCTURE; SCATTERING DIFFRACTION PATTERNS; PHOTOEMISSION HOLOGRAPHY; ATOMIC-RESOLUTION; ELECTRON; SURFACE; IMAGES; RECONSTRUCTION; ACCURACY; ENERGY AB A 351 eV photoelectron hologram of a Pt(111) surface was collected by detection of photoelectrons from the 4f5/2 subshell in a display analyzer, and was Fourier-analyzed. The real space image showed sensitivity to the fourth atomic layer, excellent reproduction of the fcc lattice, and sixteen source-atom neighbors. Transverse atomic positions were located to 0.1 angstrom. Photoelectron holography is thus shown to be capable of imaging lattices and interfaces, using low-energy electrons. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. RP PETERSEN, BL (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 30 TC 9 Z9 9 U1 0 U2 0 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 OCT 8 PY 1993 VL 213 IS 3-4 BP 412 EP 421 DI 10.1016/0009-2614(93)85155-H PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MA390 UT WOS:A1993MA39000034 ER PT J AU BRACKBILL, JU VU, HX AF BRACKBILL, JU VU, HX TI ELECTRON KINETIC EFFECTS IN SWITCH-OFF SLOW SHOCKS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CYCLOTRON INSTABILITY; MODE SHOCKS AB Numerical simulations of the slow-mode switch-off shock with kinetic electrons give significantly different results from hybrid simulations with fluid electrons. With appropriate downstream boundary conditions there results a more coherent and more strongly damped trailing magnetic wave with fewer back-streaming ions than with the hybrid model under the same conditions. Evidently, kinetic effects cause a more equal sharing of shock-induced entropy increases between ions and electrons, which results in lower ion temperatures downstream and greater electron energy transport from downstream to upstream. RP BRACKBILL, JU (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 14 Z9 14 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 OCT 8 PY 1993 VL 20 IS 19 BP 2015 EP 2018 DI 10.1029/93GL02243 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MB580 UT WOS:A1993MB58000002 ER PT J AU WANAMAKER, BJ DUBA, AG AF WANAMAKER, BJ DUBA, AG TI ELECTRICAL-CONDUCTIVITY OF POLYCRYSTALLINE OLIVINE CONTAINING A SILICATE GLASS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID UPPER MANTLE; PARTIAL MELT; INVERSION AB The complex impedance of a polycrystalline sample of San Carlos olivine including 5 vol% of a synthetic silicate glass containing sodium, magnesium, and iron has been measured as a function of temperature under controlled oxygen fugacity at a.c. frequencies of 10(2), 10(3), and 10(4) Hz. Below approximately 800-degrees-C, the conductivity of the sample is at least 5 to 10 times higher than that of single crystal and polycrystalline San Carlos olivine, respectively, and has an activation energy half that of the single crystal. The sample conductivity increases dramatically as a function of the measurement frequency. Hysteresis and time-dependent changes in sample conductivity are observed above the liquidus of the glass (approximately 900-degrees-C). The data suggest that the electrical conductivity of partially molten samples is characterized by parallel conduction of the solid and melt phases and is a sensitive indicator of melt distribution as well as the kinetics of melt re-equilibration. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WANAMAKER, BJ (reprint author), UNIV MINNESOTA,DEPT GEOL & GEOPHYS,310 PILLSBURY DR SE,MINNEAPOLIS,MN 55455, USA. NR 20 TC 7 Z9 8 U1 0 U2 5 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 OCT 8 PY 1993 VL 20 IS 19 BP 2107 EP 2110 DI 10.1029/93GL01886 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MB580 UT WOS:A1993MB58000025 ER PT J AU HOLCOMB, DJ AF HOLCOMB, DJ TI OBSERVATIONS OF THE KAISER EFFECT UNDER MULTIAXIAL STRESS STATES - IMPLICATIONS FOR ITS USE IN DETERMINING IN-SITU STRESS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID GRANITE AB Experimental tests of the Kaiser effect, the stress-history dependence of acoustic emission production, show that interactions between principal stresses cannot be ignored as is commonly done when trying to use the Kaiser effect to determine in situ stress. Experimental results obtained under multiaxial stress states are explained in terms of a qualitative model. The results show that the commonly-used technique of loading uniaxially along various directions to determine stress history must be reevaluated as it cannot be justified in terms of the laboratory experiments. One possible resolution of the conflict between laboratory and field results is that the Kaiser effect phenomenon observed in cores retrieved from the earth is not the same phenomenon as is observed in rock loaded under laboratory conditions. RP HOLCOMB, DJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 20 TC 17 Z9 18 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 OCT 8 PY 1993 VL 20 IS 19 BP 2119 EP 2122 DI 10.1029/93GL01270 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MB580 UT WOS:A1993MB58000028 ER PT J AU FUGER, J HAIRE, RG PETERSON, JR AF FUGER, J HAIRE, RG PETERSON, JR TI MOLAR ENTHALPIES OF FORMATION OF BACMO3 AND BACFO3 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID STANDARD ENTHALPY; PEROVSKITE; METAL AB The enthalpies of solution of BaCmO3 and BaCfO3 in 1.00 mol dm-3 HClO4 were measured at 298.15+/-0.05 K and p-degrees = 101.325 kPa as -(345.3+/-4.7) and -(347.2+/-1.9) kJ mol-1, respectively. The resulting standard molar enthalpies of formation, DELTA(f)H(m)degrees(BaCmO3, cr) = -(1517.8+/-7.1) kJ mol-1 and DELTA(f)H(m)degrees(BaCfO3, cr) -(1477.9+/-5.6) kJ mol-1, together with other corresponding experimental values for several lanthanide, actinide and transition metal complex oxides with barium and strontium, are used to estimate the molar enthalpies of formation of a number of homologous actinide compounds. The present results also provide additional information on the standard molar enthalpy of formation of CfO2 and on the Cf4+/Cf3+ standard potential. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST TRANSURANIUM ELEMENTS,D-76125 KARLSRUHE,GERMANY. RP FUGER, J (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 30 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT 8 PY 1993 VL 200 BP 181 EP 185 DI 10.1016/0925-8388(93)90491-5 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA MC272 UT WOS:A1993MC27200032 ER PT J AU JACKSON, WE DELEON, JM BROWN, GE WAYCHUNAS, GA CONRADSON, SD COMBES, JM AF JACKSON, WE DELEON, JM BROWN, GE WAYCHUNAS, GA CONRADSON, SD COMBES, JM TI HIGH-TEMPERATURE XAS STUDY OF FE2SIO4 LIQUID - REDUCED COORDINATION OF FERROUS IRON SO SCIENCE LA English DT Article ID MOLTEN FEO-SIO2 SYSTEM; X-RAY-ABSORPTION; SILICATE MELTS; GLASSES; MINERALS; DENSITY; FAYALITE; SPECTRA; OLIVINE; IONS AB X-ray absorption spectroscopy (XAS) of Fe2+ in Fe2SiO4 liquid at 1575 kelvin and 10(-4) gigapascal (1 bar) shows that the Fe2+-O bond length is 1.98 +/- 0.02 angstroms compared with almost-equal-to 2.22 angstroms in crystalline Fe2SiO4 (fayalite) at the melting point (1478 kelvin), which indicates a decrease in average Fe2+ coordination number from six in fayalite to four in the liquid. Anharmonicity in the liquid was accounted for using a data analysis procedure. This reduction in coordination number is similar to that observed on the melting of certain ionic salts. These results are used to develop a model of the medium-range structural environment of Fe2+ in olivine-composition melts, which helps explain some of the properties of Fe2SiO4 liquid, including density, viscosity, and the partitioning of iron and nickel between silicate melts and crystalline olivines. Some of the implications of this model for silicate melts in the Earth's crust and mantle are discussed. C1 STANFORD UNIV, DEPT GEOL & ENVIRONM SCI, STANFORD, CA 94305 USA. STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA 94305 USA. ST GOBAIN INC RECH, F-93304 AUBERVILLIERS, FRANCE. LOS ALAMOS NATL LAB, ELECTR RES GRP, LOS ALAMOS, NM 87545 USA. STANFORD UNIV, CTR MAT RES, STANFORD, CA 94305 USA. NR 53 TC 54 Z9 54 U1 7 U2 25 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD OCT 8 PY 1993 VL 262 IS 5131 BP 229 EP 233 DI 10.1126/science.262.5131.229 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MA665 UT WOS:A1993MA66500031 PM 17841870 ER PT J AU PRATT, LR KELLER, RA AF PRATT, LR KELLER, RA TI ESTIMATE OF THE PROBABILITY OF DIFFUSIONAL MISORDERING IN HIGH-SPEED DNA-SEQUENCING SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter AB The issue of diffusional misordering of sequentially cleaved pairs of nucleic acid bases, in high-s sequencing is studied by extracting the expected fraction of misordered pairs from solutions of diffusion-flow equations. These results are used to determine cutting rates, flow velocities, and distances to detectors that correspond to target fractions of misordered pairs. RP PRATT, LR (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 5 TC 8 Z9 8 U1 0 U2 0 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 OCT 7 PY 1993 VL 97 IS 40 BP 10254 EP 10255 DI 10.1021/j100142a002 PG 2 WC Chemistry, Physical SC Chemistry GA MA741 UT WOS:A1993MA74100002 ER PT J AU FISHER, ER HO, P BREILAND, WG BUSS, RJ AF FISHER, ER HO, P BREILAND, WG BUSS, RJ TI TEMPERATURE-DEPENDENCE OF THE REACTIVITY OF OH(X(2)PI) WITH OXIDIZED SILICON-NITRIDE AND PMMA FILM SURFACES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LASER-INDUCED FLUORESCENCE; HYDROXYL RADICAL DESORPTION; OH RADICALS; SINGLE-CRYSTAL; RATE CONSTANTS; POLYCRYSTALLINE; KINETICS; DYNAMICS; PT(111); STATES AB The reactivity of OH(X2PI) with the surface of both an oxidized silicon nitride film and a poly(methyl methacrylate) (PMMA) film is measured to be 0.60 +/- 0.05 at room temperature. The reactivity of OH with oxidized Si3N4 substrates displays an inverse dependence on substrate temperature, decreasing to approximately 0 at temperatures above 500 K. The reactivity is determined directly using spatially resolved laser-induced fluorescence of OH in a plasma-generated molecular beam incident on the surface. The desorbed OH has a cosine angular distribution. No evidence for a dependence of reactivity on rotational state of the OH was observed. The reactivity of OH with a PMMA film is also explored using different gas compositions in the plasma beam source. Exposure of the PMMA surface to O2 and O2/CF4 plasmas results in the generation and desorption of OH. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 54 TC 18 Z9 18 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 7 PY 1993 VL 97 IS 40 BP 10287 EP 10294 DI 10.1021/j100142a006 PG 8 WC Chemistry, Physical SC Chemistry GA MA741 UT WOS:A1993MA74100006 ER PT J AU ROSENWAKS, Y THACKER, BR NOZIK, AJ SHAPIRA, Y HUPPERT, D AF ROSENWAKS, Y THACKER, BR NOZIK, AJ SHAPIRA, Y HUPPERT, D TI RECOMBINATION DYNAMICS AT INP LIQUID INTERFACES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TIME-RESOLVED LUMINESCENCE; INDIUM-PHOSPHIDE; CHARGE-TRANSFER; SURFACE; VELOCITY; GAAS; SEMICONDUCTORS; EXCITATION; JUNCTIONS; PULSE AB The relaxation dynamics of photoexcited charge carriers at the interface between InP and several metal ion solutions has been studied using picosecond time-resolved photoluminescence and electrochemical techniques. The results show that for p-InP, the controlling recombination process follows the nonradiative Shockley-Read-Hall (SRH) mechanism, while on the other hand, radiative bulk recombination is the controlling process in n-type crystals. The surface recombination velocities (SRV) of both conductivity types were found to be strongly dependent (varying over the range of 500 to 2 x 10(5) cm/s) on the ionic solution composition and concentration. The SRV of the etched n-InP surface is retained and remains low when it is in contact with nonoxidizing ions like Zn2+ or Cr3+. On the other hand, for n-InP, the SRV increases sharply when the crystal is dipped into stronger oxidizing species like Ag+ (SRV = 1.4 x 10(5) cm/s) or Cu2+ (SRV = 3.4 x 10(4) cm/s). The electrochemical measurements provided firm evidence for chemisorbed-induced surface states in the case of the more strongly oxidizing solutions. The distribution of the surface states was extracted from a frequency dispersion analysis of the electrodes' impedance and was found to correlate with the SRVs. We discuss the SRV dependence on the redox potentials of the various solutions and the similarity of the results to those obtained in the past for CdS and CdSe. C1 TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. RP ROSENWAKS, Y (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 36 TC 27 Z9 27 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 7 PY 1993 VL 97 IS 40 BP 10421 EP 10429 DI 10.1021/j100142a026 PG 9 WC Chemistry, Physical SC Chemistry GA MA741 UT WOS:A1993MA74100026 ER PT J AU FAUST, R VOLLHARDT, KPC AF FAUST, R VOLLHARDT, KPC TI SEMIBUCKMINSTERFULLERENE - MNDO STUDY OF A HEMISPHERICAL TRIINDENOTRIPHENYLENE SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID CORANNULENE; FULLERENES; MOLECULES AB Semiempirical geometry optimization of triindenotriphenylene predicts a rigid cup-shaped structure with strain-induced bond alternation in the central benzenoid ring; model studies of the corresponding Li complex suggest that metal coordination occurs preferentially from the convex side of the bowl. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Faust, Rudiger/K-4891-2014 OI Faust, Rudiger/0000-0002-9231-591X NR 17 TC 35 Z9 35 U1 0 U2 4 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 OCT 7 PY 1993 IS 19 BP 1471 EP 1473 DI 10.1039/c39930001471 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA MB937 UT WOS:A1993MB93700005 ER PT J AU TAKAHASHI, S SABOUNGI, ML KLINGLER, RJ CHEN, MJ RATHKE, JW AF TAKAHASHI, S SABOUNGI, ML KLINGLER, RJ CHEN, MJ RATHKE, JW TI DYNAMICS OF ROOM-TEMPERATURE MELTS - NUCLEAR-MAGNETIC-RESONANCE MEASUREMENTS OF DIALKYLIMIDAZOLIUM HALOALUMINATES SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID CHLORIDE IONIC LIQUIDS; CHLOROALUMINATE MELTS; AL-27; SPECTROSCOPY; ELECTRODE; MOLTEN AB The room-temperature molten salts formed by combining AlCl3 with 1-ethyl-3-methylimidazolium chloride (EMIC) have been investigated by Al-27 and Cl-35 NMR spectroscopy at temperatures from 25 to 100-degrees-C. The initial AlCl3 loading was varied from 50 mol%, where AlCl4- is the major complex ion, to 67 mol%, where Al2Cl7- is the predominant aluminium-containing species. The Al-27 NMR spectra for the melts all exhibit a single major resonance line with minimal variation in the chemical shift, 103.3-103.4 ppm. However, it is possible to distinguish the AlCl4- and Al2Cl7- complexes by their characteristic linewidths. Thus, the Al-27 linewidth for the symmetrically substituted AlCl4- complex is two orders of magnitude smaller than the linewidth for Al2Cl7- (full peak width at half height, 22.8 vs. 2624 Hz). In addition, a third minor species was observed at 97 ppm in the Al-27 NMR spectra for melts with initial AlCl3 loadings of 55-64 mol%. This third species (which earlier work attributed to the AlCl4- ion) was normally present at trace concentration levels, 0.3 mol%, and was found to increase with the addition of water to the melt. For melt compositions with the initial AlCl3 loadings intermediate between 50 and 67 mol%, the apparent Al-27 NMR linewidth varies with the pre-acquisition delay time, consistent with a mixture of the AlCl4- and Al2Cl7-complexes. The resulting non-Lorentzian NMR lineshapes were analysed on the basis of a standard two-site exchange process between AlCl4- and Al2Cl7-. Qualitatively, the exchange between the aluminium centres in AlCl4- and Al2Cl7- is fast on the Al-27 NMR timescale. Thus, the lifetime of an aluminium centre in the AlCl4- complex varies from roughly 30 mus at 25-degrees-C to 70 mus at 100-degrees-C and exhibits an activation energy of ca. 2 kcal mol-1. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. RP TAKAHASHI, S (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 20 TC 22 Z9 24 U1 0 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD OCT 7 PY 1993 VL 89 IS 19 BP 3591 EP 3595 DI 10.1039/ft9938903591 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB669 UT WOS:A1993MB66900012 ER PT J AU SEVRIN, A TROOST, W AF SEVRIN, A TROOST, W TI EXTENSIONS OF THE VIRASORO ALGEBRA AND GAUGED WZW MODELS SO PHYSICS LETTERS B LA English DT Article ID W3 GRAVITY; QUANTIZATION AB To any non-trivial embedding of sl(2) in a (super) Lie algebra, one can associate an extension of the Virasoro algebra. We realize the extended Virasoro algebra in terms of a WZW model in which a chiral, solvable group is gauged, the gauge group being determined by the sl(2) embedding. The resulting BRST cohomology is computed and the field content of the extended Virasoro algebra is determined. The closure of the extended Virasoro algebra is shown. Applications such as the quantum Miura transformation and the effective action of the associated extended gravity theory are discussed. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV LEUVEN,INST THEORET FYS,B-3001 LOUVAIN,BELGIUM. RI Sevrin, Alexander/D-5794-2017 OI Sevrin, Alexander/0000-0001-6564-9941 NR 33 TC 18 Z9 18 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 OCT 7 PY 1993 VL 315 IS 3-4 BP 304 EP 310 DI 10.1016/0370-2693(93)91617-V PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MA234 UT WOS:A1993MA23400016 ER PT J AU BARNETT, RM GUNION, JF HABER, HE AF BARNETT, RM GUNION, JF HABER, HE TI DISCOVERING SUPERSYMMETRY WITH LIKE-SIGN DILEPTONS SO PHYSICS LETTERS B LA English DT Article ID GLUINO; SEARCH; SIGNATURES; COLLISIONS; PARTICLES; COLLIDER; DECAYS AB Supersymmetry may be discovered at hadron colliders by searching for events similar to the top quark signal of two isolated leptons. In the case of gluino production, the most distinguishing feature is that in half the events the two leading leptons have the same sign. We demonstrate the remarkable sensitivity of this gluino signature at both the Fermilab Tevatron Collider and at the Superconducting Super Collider. Techniques for approximately determining the gluino mass are discussed. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. RP BARNETT, RM (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720, USA. NR 23 TC 84 Z9 84 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 7 PY 1993 VL 315 IS 3-4 BP 349 EP 354 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MA234 UT WOS:A1993MA23400022 ER PT J AU DAI, J GUNION, JF VEGA, R AF DAI, J GUNION, JF VEGA, R TI GUARANTEED DETECTION OF A MINIMAL SUPERSYMMETRIC MODEL HIGGS-BOSON AT HADRON SUPERCOLLIDERS SO PHYSICS LETTERS B LA English DT Article ID DECAYS AB We demonstrate that expected efficiencies and purities for b-tagging at SSC/LHC detectors should allow detection of at least one of the Higgs bosons of the Minimal Supersymmetric Model in ttBAR Higgs production, with Higgs --> bbBAR decay, over a substantial range of supersymmetric parameter space. In particular, with the addition of this mode to those previously considered, there is no region of supersymmetric parameter space for which none of the Higgs bosons of the model can be seen at the SSC/LHC. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS INST HIGH ENERGY PHYS,DAVIS,CA 95616. SO METHODIST UNIV,DEPT PHYS,DALLAS,TX 75275. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP DAI, J (reprint author), RUTGERS UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855, USA. NR 13 TC 31 Z9 31 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 OCT 7 PY 1993 VL 315 IS 3-4 BP 355 EP 359 DI 10.1016/0370-2693(93)91624-V PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MA234 UT WOS:A1993MA23400023 ER PT J AU RIZZO, TG AF RIZZO, TG TI CONSTRAINTS ON ANOMALOUS GAUGE BOSON COUPLINGS FROM B-]S-GAMMA SO PHYSICS LETTERS B LA English DT Article ID MAGNETIC-MOMENT; SELF-COUPLINGS; VECTOR BOSONS; E+E-->W+W; DECAY; VIOLATION; COLLIDER; SECTOR; TESTS; PROBE AB The recent results of the CLEO Collaboration on both inclusive and exclusive radiative B decays are combined with those of the UA2 Collaboration on Wgamma production to highly constrain the anomalous trilinear gauge couplings of the W. The theoretical analysis of the b --> sgamma process employs next-to-leading order operator coefficient evolution as well as QCD bremsstrahlung and appropriate phase space corrections. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 46 TC 23 Z9 23 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 OCT 7 PY 1993 VL 315 IS 3-4 BP 471 EP 476 DI 10.1016/0370-2693(93)91643-2 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MA234 UT WOS:A1993MA23400042 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T FREY, A GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S BORZEMSKI, P CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK I GLASER, R GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KROGER, W KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES Jr JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH I GALLO, E HARRIS, VL MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M MINE, S NAGASAWA, Y NAGIRA, T NAKAO, M OKUNO, H SUZUKI I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y AF DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T FREY, A GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S BORZEMSKI, P CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GLASER, R GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KROGER, W KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR, I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M MINE, S NAGASAWA, Y NAGIRA, T NAKAO, M OKUNO, H SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI OBSERVATION OF EVENTS WITH A LARGE RAPIDITY GAP IN DEEP-INELASTIC SCATTERING AT HERA SO PHYSICS LETTERS B LA English DT Article ID POMERON STRUCTURE-FUNCTION; LUND MONTE-CARLO; JET FRAGMENTATION; ELASTIC-SCATTERING; E+E ANNIHILATION; QCD; DIFFRACTION; COHERENCE; DYNAMICS; PHYSICS AB In deep inelastic, neutral current scattering of electrons and protons at square-root s = 296 GeV, we observe in the ZEUS detector events with a large rapidity gap in the hadronic final state. They occur in the region of small Bjorken x and are observed up to Q2 of 100 GeV2. They account for about 5% of the events with Q2 greater-than-or-equal-to 10 GeV2. Their general properties are inconsistent with the dominant mechanism of deep inelastic scattering, where color is transferred between the scattered quark and the proton remnant, and suggest that the underlying production mechanism is the diffractive dissociation of the virtual photon. C1 INFN BOLOGNA, BOLOGNA, ITALY. UNIV BOLOGNA, I-40126 BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. UNIV BRISTOL, HH WILLS PHYS LAB, BRISTOL BS8 1TL, AVON, ENGLAND. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. INFN, COSENZA, ITALY. UNIV CALABRIA, DEPT PHYS, COSENZA, ITALY. COLUMBIA UNIV, NEVIS LABS, IRVINGTON ON HUDSON, NY USA. INST NUCL PHYS, PL-31342 KRAKOW, POLAND. STANISLAW STASZIC UNIV MIN & MET, FAC PHYS & NUCL TECHN, PL-30059 KRAKOW, POLAND. JAGIELLONIAN UNIV, DEPT PHYS, PL-31007 KRAKOW, POLAND. DESY, W-2000 HAMBURG 52, GERMANY. DESY ZEUTHEN, INST HOCHENERGIEPHYS, ZEUTHEN, GERMANY. UNIV FLORENCE, I-50121 FLORENCE, ITALY. INFN, FLORENCE, ITALY. UNIV FREIBURG, INST PHYS, W-7800 FREIBURG, GERMANY. INFN, LAB NAZL FRASCATI, FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HAMBURG, INST EXPTL PHYS 1, W-2000 HAMBURG 13, GERMANY. UNIV HAMBURG, INST EXPTL PHYS 2, W-2000 HAMBURG 13, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, HIGH ENERGY NUCL PHYS GRP, LONDON SW7 2AZ, ENGLAND. UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH 1, GERMANY. KOREA UNIV, SEOUL, SOUTH KOREA. LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA. UNIV AUTONOMA MADRID, DEPT FIS TEOR, MADRID 34, SPAIN. UNIV MANITOBA, DEPT PHYS, WINNIPEG R3T 2N2, MANITOBA, CANADA. MCGILL UNIV, DEPT PHYS, MONTREAL H3A 2T5, QUEBEC, CANADA. MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW, RUSSIA. NIKHEF AMSTERDAM, AMSTERDAM, NETHERLANDS. OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND. INFN, PADUA, ITALY. UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY. PENN STATE UNIV, DEPT PHYS, UNIV PK, PA 16802 USA. INFN, ROME, ITALY. UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA. UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN 21, GERMANY. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV TOKYO, INST NUCL STUDY, TOKYO 113, JAPAN. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO 158, JAPAN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10124 TURIN, ITALY. INFN, TURIN, ITALY. UNIV TORONTO, DEPT PHYS, TORONTO M5S 1A1, ONTARIO, CANADA. UNIV LONDON UNIV COLL, DEPT PHYS & ASTRON, LONDON WC1E 6BT, ENGLAND. VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA. UNIV WARSAW, INST EXPTL PHYS, PL-00325 WARSAW, POLAND. INST NUCL STUDIES, WARSAW, POLAND. WEIZMANN INST SCI, DEPT NUCL PHYS, REHOVOT, ISRAEL. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. YORK UNIV, DEPT PHYS, N YORK, ON, CANADA. UNIV SALERNO, DIPARTIMENTO FIS, I-84100 SALERNO, ITALY. RP DERRICK, M (reprint author), ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RI Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Guida, MIchele/J-4714-2012; Wiggers, Leo/B-5218-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Frasconi, Franco/K-1068-2016; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008 OI Doyle, Anthony/0000-0001-6322-6195; Guida, MIchele/0000-0002-1108-5391; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Frasconi, Franco/0000-0003-4204-6587; Castellini, Guido/0000-0002-0177-0643; Anzivino, Giuseppina/0000-0002-5967-0952; iori, maurizio/0000-0002-6349-0380; Lancaster, Mark/0000-0002-8872-7292; De Pasquale, Salvatore/0000-0001-9236-0748; NR 40 TC 302 Z9 302 U1 1 U2 17 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 OCT 7 PY 1993 VL 315 IS 3-4 BP 481 EP 493 DI 10.1016/0370-2693(93)91645-4 PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MA234 UT WOS:A1993MA23400044 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 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 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 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 AN S-MATRIX ANALYSIS OF THE Z-RESONANCE SO PHYSICS LETTERS B LA English DT Article ID FERMION PAIR PRODUCTION; Z-LINE-SHAPE; E+E ANNIHILATION; QED CORRECTIONS; Z-PEAK; ASYMMETRIES AB The S matrix ansatz is a rigorously model independent approach to describe the cross-sections and asymmetries in e+ e- annihilation. Using the cross-sections and asymmetries measured with the L3 detector during the 1990 and 1991 running period, we determine the mass and the width of the Z boson, the contributions of the Z exchange and of the gammaZ interference. Including the polarization of the tau lepton in the analysis, the leptonic helicity amplitudes of the scattering process are determined assuming lepton universality. The results are compared with other model independent ansatzes as realized in ZFITTER. A systematic bias of the Z mass due to the gammaZ interference term is detected, which leads to an underestimation of the error on m(Z) for model independent determinations. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. IN2P3, ANNECY VIEUX PHYS PARTICULES LAB, LAPP, CNRS, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. UNIV BUCHAREST, R-76900 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 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. USTC, 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, INST PHYS NUCL LYON, CNRS, F-69622 VILLEURBANNE, FRANCE. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. INFN, SEZ MILANO, I-20133 MILAN, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW, RUSSIA. INFN, SEZ NAPOLI, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, CYPRUS, GREECE. 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, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, SEZ ROMA, 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, 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. ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. RP ADRIANI, O (reprint author), RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. 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; Tsaregorodtsev, Andrei/E-3873-2016; 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; van der Zwaan, Bob/F-4070-2015; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014 OI Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; 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; Diemoz, Marcella/0000-0002-3810-8530; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; van der Zwaan, Bob/0000-0001-5871-7643; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731 NR 23 TC 21 Z9 21 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 OCT 7 PY 1993 VL 315 IS 3-4 BP 494 EP 502 DI 10.1016/0370-2693(93)91646-5 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MA234 UT WOS:A1993MA23400045 ER PT J AU FRANCE, LL KIELECZAWA, J DUNN, JJ LUFT, BJ HIND, G SUTHERLAND, JC AF FRANCE, LL KIELECZAWA, J DUNN, JJ LUFT, BJ HIND, G SUTHERLAND, JC TI EVIDENCE FOR AN ALPHA-HELICAL EPITOPE ON OUTER SURFACE PROTEIN-A FROM THE LYME-DISEASE SPIROCHETE, BORRELIA-BURGDORFERI - AN APPLICATION OF STEADY-STATE AND TIME-RESOLVED FLUORESCENCE QUENCHING TECHNIQUES SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE TRYPTOPHAN FLUORESCENCE; TIME-RESOLVED FLUORESCENCE; FLUORESCENCE QUENCHING; LYME DISEASE; OUTER SURFACE PROTEIN-A; ALPHA-HELIX ID FLUOROMETER; RESIDUES; DECAY; OSPA AB Outer surface protein A (OspA) is a major antigen of Borrelia burgdorferi, the etiological agent of Lyme disease. A recombinant form of OspA (OspA-257) from R burgdorferi, strain B31, contains 257 amino acids and a single tryptophan residue at position 216 (Trp-216). Mapping studies indicate that Trp-216 is involved in the epitope for the agglutinating monoclonal antibody 105.5. However, the fluorescence emission maximum of the native protein is 330 nm, indicating that Trp-216 is not solvent-exposed. Primary structure analysis suggests an alpha-helical conformation for residues approx. 204-217, which, if located on the protein surface, would allow Trp-216 to be buried, while leaving hydrophilic residues on the opposite side of the helix exposed. This helix would place Lys-212 within approx. 6 angstrom of Trp-216; the presence of such a positively-charged residue can, in principle, be ascertained from fluorescence quenching studies. Stern-Volmer plots confirm that Trp-216 is indeed buried in the native protein, but is readily accessible to the small polar quencher, acrylamide. Furthermore, the dominant component of the fluorescence emission shows only weak dynamic quenching by the positively-charged quencher, Cs+, while the minor component undergoes static quenching by I-, indicating the proximity of a positively-charged residue. These data are consistent with the existence of an alpha-helix from residues 204-217 in the predicted orientation at the protein surface, hence indicating the structure of the antigentic determinant. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. SUNY,DEPT MED,STONY BROOK,NY 11794. FU NIAID NIH HHS [1 R01 AI32454-01]; NIGMS NIH HHS [GM34662] NR 25 TC 9 Z9 9 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 OCT 6 PY 1993 VL 1202 IS 2 BP 287 EP 296 DI 10.1016/0167-4838(93)90018-M PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA MB652 UT WOS:A1993MB65200017 PM 7691186 ER PT J AU SEVOV, SC CORBETT, JD AF SEVOV, SC CORBETT, JD TI K10IN10Z (Z = NI, PD, OR PT) - ZINTL PHASES CONTAINING ISOLATED DECAINDIUM CLUSTERS CENTERED BY TRANSITION-ELEMENTS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SOLID-STATE; ANIONS AB The isostructural title compounds are obtained by high yield by slowly cooling the appropriate fused mixture in welded Ta. They occur in the orthorhombic space group Pnma, Z = 12, with a = 15.948(6), 16.043(6), 16.056(3) angstrom, b = 32.565(6), 32.73(1), 32.692(1) angstrom, and c = 18.822(3), 18.895(5), 18.896(3) angstrom for the Ni, Pd, and Pt derivatives, respectively. The structure of the Ni phase was refined by single crystal means (R, R(w) = 2.9, 3.3%) and shown to be constructed from close-packed layers of Ni-centered In10 clusters that are separated by potassium ions both within and between the cluster layers. The compounds have large resistivities at room temperature by two-probe methods and are diamagnetic, with no moments on the transition metals. The geometry of the clusters can be derived from an ideal tetracapped trigonal prism (C3v) of In centered by Z through axial compression along the 3-fold axis and opening of the capped triangular face so as to yield substantially equal Ni-In distances. The clusters are also related to Sb7(3-) etc. Charge-consistent extended-Huckel MO calculations show that the Ni-centered cluster has a closed shell with 2n = 20 skeletal electrons, only the s and p orbitals on the interstitial mixing with appropriate cluster orbitals. The d orbitals on Ni do not appear to participate significantly, presumably because they are fully reduced (lie too low) relative to In p (d(In-Ni) is similar to 2.8 angstrom). This means that Ni, Pd, and Pt behave as quasi-main-group elements. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 22 TC 50 Z9 50 U1 0 U2 3 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 OCT 6 PY 1993 VL 115 IS 20 BP 9089 EP 9094 DI 10.1021/ja00073a026 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA MC277 UT WOS:A1993MC27700026 ER PT J AU DEMING, TJ NOVAK, BM AF DEMING, TJ NOVAK, BM TI MECHANISTIC STUDIES ON THE NICKEL-CATALYZED POLYMERIZATION OF ISOCYANIDES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ELECTROLYTE SURFACTANT COMPLEXES; LIVING POLYMERIZATION; ACHIRAL ISOCYANIDES; HELICAL POLYMERS; POLYISOCYANIDES; POLY(IMINOMETHYLENES); CHANNEL; INSERTION; MULTIPLE AB All mechanistic aspects of nickel-mediated isocyanide polymerizations have been examined experimentally. Chain initiation has been studied by C-13{H-1} NMR at low temperature using a living polymerization system. Chain propagation has been examined by cyclic voltammetry, ESR spectroscopy, magnetic susceptibility measurements, temperature dependent kinetic studies, and substituent effect analysis. The chain-propagation studies were performed on both living and classical heterogeneous systems and were found to be invariant with respect to the type of nickel initiator used. Finally, chain-transfer reactions were studied by NMR, kinetic studies, substituent effect analyses, and chemical studies. Comprehensive mechanistic schemes have been derived from the experimental data and are presented as the most probable reaction pathways. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. RI Deming, Timothy/I-5411-2013; OI Deming, Timothy/0000-0002-0594-5025 NR 68 TC 75 Z9 75 U1 0 U2 10 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 OCT 6 PY 1993 VL 115 IS 20 BP 9101 EP 9111 DI 10.1021/ja00073a028 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA MC277 UT WOS:A1993MC27700028 ER PT J AU ELIEZER, D FRANK, P GILLIS, N NEWTON, WE DONIACH, S HODGSON, KO AF ELIEZER, D FRANK, P GILLIS, N NEWTON, WE DONIACH, S HODGSON, KO TI SMALL-ANGLE X-RAY-SCATTERING STUDIES OF THE IRON-MOLYBDENUM COFACTOR FROM AZOTOBACTER-VINELANDII NITROGENASE SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID CUBANE CLUSTER COMPLEXES; PROTEIN-ALPHA-SUBUNIT; KLEBSIELLA-PNEUMONIAE; FEMO-COFACTOR; MOFE PROTEIN; STRUCTURAL INSIGHTS; ABSORPTION; EDGE; SPECTROSCOPY; COORDINATION AB The nitrogenase enzyme complex, consisting of the molybdenum-iron protein and the iron protein, plays a critical role in the biological reduction of dinitrogen to ammonia (nitrogen fixation). The nitrogen-fixing site within the molybdenum-iron protein is an iron-molybdenum-sulfur cofactor (FeMoco) of roughly 1000-2000 Dalton mass. Structural aspects of FeMoco have been determined by spectroscopic and more recently by crystallographic studies. In order to determine the radius of gyration (R(g)) of isolated FeMoco, we have performed small-angle x-ray scattering studies of FeMoco in N-methylformamide solution, in the absence of the molybdenum-iron protein. Model compounds of known structure have also been examined in similar solvents, N,N-dimethylformamide and acetonitrile, as controls and for calibration purposes. The R(g) values obtained for the models are in good agreement with calculations based upon their respective crystal structures. However, the R(g) obtained for FeMoco clearly indicates that the cofactor is not monomeric in solution, but rather aggregated and possibly polydisperse. Further, R(g) values were also measured after addition of thiol, dithionite, and thiol and dithionite, to the FeMoco samples. The results indicate, surprisingly, that oxidation state and putative thiol coordination have no detectable effect on the aggregation behavior of FeMoco in solution, as determined by these measurements. C1 STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. VIRGINIA POLYTECH INST & STATE UNIV,DEPT BIOCHEM & NUTR,BLACKSBURG,VA 24061. FU NCRR NIH HHS [RR01209]; NIDDK NIH HHS [DK37255] NR 32 TC 7 Z9 7 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD OCT 5 PY 1993 VL 268 IS 28 BP 20953 EP 20957 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MA288 UT WOS:A1993MA28800050 PM 8407930 ER PT J AU LIU, SH MA, JT YUEH, AY LEESMILLER, SP ANDERSON, CW NG, SY AF LIU, SH MA, JT YUEH, AY LEESMILLER, SP ANDERSON, CW NG, SY TI THE CARBOXYL-TERMINAL TRANSACTIVATION DOMAIN OF HUMAN SERUM RESPONSE FACTOR CONTAINS DNA-ACTIVATED PROTEIN-KINASE PHOSPHORYLATION SITES SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID GLUTATHIONE-S-TRANSFERASE; TERNARY COMPLEX-FORMATION; VIRUS-40 T-ANTIGEN; RNA POLYMERASE-II; C-FOS PROMOTER; TRANSCRIPTION FACTOR; MAMMALIAN-CELLS; ESCHERICHIA-COLI; BINDING ACTIVITY; KU-AUTOANTIGEN AB The serum response factor (SRF) is a 67-kDa phosphoprotein that, together with auxiliary factors, modulates transcription of immediate early genes containing serum response elements in their promoters. Here we show that the carboxyl-terminal domain of human SRF is phosphorylated in vivo and is recognized in vitro by the double-stranded DNA-activated serine/threonine-specific protein kinase, DNA-PK. SRF phosphorylation by DNA-PK was stimulated by its cognate binding site. Protein microsequence analysis of a 22-amino acid synthetic SRF peptide and phosphopeptide analysis of genetically altered glutathione S-transferase-SRF fusion proteins identified Ser-435 and Ser-446 of human SRF as sites phosphorylated by DNA-PK. Both serines are followed by glutamine. Changing Gln-436 and Gln-447 to other residues reduced or eliminated phosphorylation by DNA-PK, confirming that these glutamines are important determinants for kinase recognition. The carboxyl-terminal transcription activation domain was mapped within a 71-amino acid region that contains both DNA-PK phosphorylation sites. Amino acid substitutions that interfered with phosphorylation by DNA-PK at Ser-435/446 in GAL4-SRF fusion proteins were reduced in transactivation potency. From these data we suggest that DNA-PK phosphorylation may modulate SRF activity in vivo. C1 ACAD SINICA,INST MOLEC BIOL,TAIPEI 11529,TAIWAN. NATL TSING HUA UNIV,INST LIFE SCI,HSINCHU 30043,TAIWAN. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Yueh, Andrew/D-2079-2010 NR 56 TC 54 Z9 57 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD OCT 5 PY 1993 VL 268 IS 28 BP 21147 EP 21154 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MA288 UT WOS:A1993MA28800076 PM 8407951 ER PT J AU WONG, CW WONG, CY AF WONG, CW WONG, CY TI SOLUTIONS OF THE DEHNEN-SHAHIN RELATIVISTIC-EQUATIONS FOR POSITRONIUM SO NUCLEAR PHYSICS A LA English DT Article ID STATE QUANTUM ELECTRODYNAMICS; 2-BODY DIRAC EQUATIONS; NARROW RESONANCES; SCATTERING RESONANCES; COLLISION SYSTEMS; BHABHA SCATTERING; TH COLLISIONS; LOW-ENERGY; U-U; ELECTRON AB A pole singularity is found in the Kemmer-Fermi-Yang relativistic equation for positronium-like systems under favorable conditions. We show that its presence in the S-1(0) state for the positronium interaction used by Dehnen and Shahin does not give rise to any resonance. Resonances of zero width appear only if the electromagnetic interaction strength is increased 160-fold or more. However, the same singularity, even in a weak potential, shows an unacceptable infrared pathology in which a number of spurious bound states appear near zero energy. Examination of the phase shifts confirms the absence of resonances in the Dehnen-Shahin equation in both S-1(0) and P-3(0) states. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WONG, CW (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 58 TC 6 Z9 6 U1 0 U2 2 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 OCT 4 PY 1993 VL 562 IS 4 BP 598 EP 616 PG 19 WC Physics, Nuclear SC Physics GA MC329 UT WOS:A1993MC32900005 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 POLARIZATION OF SIGMA+ AND (SIGMA)BAR-HYPERONS PRODUCED BY 800-GEV/C PROTONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MAGNETIC-MOMENT; HYPERON POLARIZATION; QUARK POLARIZATION; INCLUSIVE-LAMBDA; 300-GEV PROTONS; 400-GEV PROTONS; HIGH-ENERGIES; ASYMMETRY; PARTICLES AB We have measured the polarization of 375-GeV/c SIGMA+ and SIGMABAR- hyperons produced by 800-GeV/c protons incident on a Cu target. We find that the SIGMA+ polarization rises with increasing p(t) to a maximum of 16% at p(t) = 1.0 GeV/c and then decreases to 10% at p(t) = 1.8 GeV/c. We compare this SIGMA+ polarization with data at lower energies. The SIGMABAR- polarization has been measured for the first time. It has the same sign as the SIGMA+ but smaller magnitude in a similar kinematical region. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. PETERSBEURG NUCL PHYS INST,GATCHINA,PEOPLES R CHINA. 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. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA. SUNY,ALBANY,NY 12222. UNIV FED PARAIBA,PARAIBA,BRAZIL. CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. CONSELHO NACL PESQUISAS,BR-22290 RIO JANEIRO,RJ,BRAZIL. UNIV SAO PAULO,SAO PAULO,BRAZIL. YALE UNIV,JW GIBBS LAB,NEW HAVEN,CT 06511. 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 35 TC 54 Z9 54 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 OCT 4 PY 1993 VL 71 IS 14 BP 2172 EP 2175 DI 10.1103/PhysRevLett.71.2172 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700002 ER PT J AU JOYCE, MJ SHARPEYSCHAFER, JF TWIN, PJ BEAUSANG, CW CULLEN, DM RILEY, MA CLARK, RM DAGNALL, PJ DELONCLE, I DUPRAT, J FALLON, P FORSYTH, PD FOTIADES, N GALE, SJ GALL, B HANNACHI, F HARISSOPULOS, S HAUSCHILD, K JONES, PM KALFAS, CA KORICHI, A LECOZ, Y MEYER, M PAUL, ES PORQUET, MG REDON, N SCHUCK, C SIMPSON, J VLASTOU, R WADSWORTH, R AF JOYCE, MJ SHARPEYSCHAFER, JF TWIN, PJ BEAUSANG, CW CULLEN, DM RILEY, MA CLARK, RM DAGNALL, PJ DELONCLE, I DUPRAT, J FALLON, P FORSYTH, PD FOTIADES, N GALE, SJ GALL, B HANNACHI, F HARISSOPULOS, S HAUSCHILD, K JONES, PM KALFAS, CA KORICHI, A LECOZ, Y MEYER, M PAUL, ES PORQUET, MG REDON, N SCHUCK, C SIMPSON, J VLASTOU, R WADSWORTH, R TI 1ST MEASUREMENT OF MAGNETIC-PROPERTIES IN A SUPERDEFORMED NUCLEUS - HG-193 SO PHYSICAL REVIEW LETTERS LA English DT Article ID BANDS; STATES; MOMENTS; EUROGAM; DY-152; ARRAY AB Dipole transitions linking signature partner superdeformed bands in 193Hg have been observed. Measurements of the photon decay branching ratios, taken together with the average superdeformed quadrupole moment measured in neighboring nuclei, enable the absolute M 1 strengths to be determined. From these data, using the strong coupling model, we find (g(K)-g(R))K/Q0=-0.14+/-0.01 (eb)-1, g(K)=-0.65+/-0.14 with OMEGA=2.8+/-0.8. These data are consistent with the superdeformed neutron orbital being [512]5/2- as predicted by cranked Woods-Saxon calculations. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,CTR SPECT NUCL & SPECTROMETRIE MASSE,F-91405 ORSAY,FRANCE. INST PHYS NUCL LYON,F-91406 ORSAY,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. DEMOCRITOS NUCL RES CTR,AGHIA PARASKEVI,ATHENS,GREECE. SERC,DARESBURY LAB,NUCL STRUCT FACIL,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. UNIV LYON 1,INST PHYS NUCL,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,F-69622 VILLEURBANNE,FRANCE. RP JOYCE, MJ (reprint author), UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,ENGLAND. RI Hauschild, Karl/A-6726-2009; Harissopulos, Sotirios/G-9541-2011 OI Harissopulos, Sotirios/0000-0003-4022-7595 NR 24 TC 59 Z9 59 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 4 PY 1993 VL 71 IS 14 BP 2176 EP 2179 DI 10.1103/PhysRevLett.71.2176 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700003 ER PT J AU WARGELIN, BJ BEIERSDORFER, P KAHN, SM AF WARGELIN, BJ BEIERSDORFER, P KAHN, SM TI RADIATIVE LIFETIME OF THE LONG-LIVED 1S2S(3)S(1) STATE IN HELIUM-LIKE NEON BY ELECTRON-BEAM EXCITATION OF TRAPPED IONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGHLY CHARGED IONS; CROSS-SECTIONS; 23S1 STATE; EMISSION; NICKEL; DECAY; LEVEL; LINE AB We report a technique for measuring the lifetimes of long-lived excited levels in highly charged ions that fall into the range from 10(-2) to 10(-7) sec, inaccessible to existing methods. Employing a fast-switching electron beam to produce and excite electrostatically trapped ions, lifetimes are determined by observing the fluorescent decay of metastable levels. A value of 90.5 +/- 1.5 musec is obtained for the 1s2s S-3(1) --> 1s2 S-1(0) transition in heliumlike neon, in good agreement with theoretical predictions of 91.1 and 92.0 musec. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 33 TC 63 Z9 63 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 4 PY 1993 VL 71 IS 14 BP 2196 EP 2199 DI 10.1103/PhysRevLett.71.2196 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700008 ER PT J AU NING, L HU, Y ECKE, RE AHLERS, G AF NING, L HU, Y ECKE, RE AHLERS, G TI SPATIAL AND TEMPORAL AVERAGES IN CHAOTIC PATTERNS SO PHYSICAL REVIEW LETTERS LA English DT Article ID RAYLEIGH-BENARD CONVECTION; TRANSITION AB We show that spatiotemporally complex patterns in the presence of a symmetry imposed by the container geometry can have ordered spatial and temporal averages. The system studied was the Kuppers-Lortz unstable state in rotating thermal convection. As the control parameter DELTAT was increased above onset, fluctuations about the ordered averaged state increased and the correlation of individual patterns with the averaged state decreased. The pattern fluctuations about the averaged state were highly correlated with the instantaneous heat transport fluctuations. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP NING, L (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. OI Ecke, Robert/0000-0001-7772-5876 NR 15 TC 44 Z9 44 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 4 PY 1993 VL 71 IS 14 BP 2216 EP 2219 DI 10.1103/PhysRevLett.71.2216 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700013 ER PT J AU NORTHRUP, JE FROYEN, S AF NORTHRUP, JE FROYEN, S TI ENERGETICS OF GAAS(100)-(2X4) AND GAAS(100)-(4X2) RECONSTRUCTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; NORM-CONSERVING PSEUDOPOTENTIALS; SURFACE; GAAS(001); STOICHIOMETRY; SPECTROSCOPY; ENERGY; SI AB Formation energies for a variety of GaAs(100) surface structures have been calculated as a function of the atomic chemical potentials using the first-principles pseudopotential density-functional approach. We find that the surface transforms through four phases as the chemical potential varies across its accessible range. As the Ga chemical potential increases the surface transforms from an As-rich c(4x4) through two distinct (2x4) structures and finally to a Ga-rich (4x2) phase. The predicted structures account for most scanning tunneling microscopy observations for the c(4x4), (2x4), and (4x2) phases. C1 NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RP XEROX CORP, PALO ALTO RES CTR, 3333 COYOTE HILL RD, PALO ALTO, CA 94304 USA. NR 21 TC 199 Z9 199 U1 1 U2 6 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 OCT 4 PY 1993 VL 71 IS 14 BP 2276 EP 2279 DI 10.1103/PhysRevLett.71.2276 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700028 ER PT J AU MAKIVIC, M TRIVEDI, N ULLAH, S AF MAKIVIC, M TRIVEDI, N ULLAH, S TI DISORDERED BOSONS - CRITICAL PHENOMENA AND EVIDENCE FOR NEW LOW-ENERGY EXCITATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERCONDUCTOR-INSULATOR TRANSITION; VORTEX-GLASS SUPERCONDUCTIVITY; REAL-SPACE RENORMALIZATION; UNIVERSAL CONDUCTIVITY; 2-DIMENSIONAL FILMS; TEMPERATURE PHASE; MAGNETIC-FIELD; DIRTY BOSONS; LOCALIZATION; SYSTEMS AB We study the T = 0 critical properties of the superfluid-insulator transition in 2D hard core Bose systems with disorder. Using quantum Monte Carlo simulations and finite size scaling on 64x64 lattices we find the dynamical exponent z = 0.5 +/- 0.1 and the correlation length exponent nu = 2.2 +/- 0.2. At the transition, the system is metallic with a conductivity sigma(c) = (1.2 +/- 0.2)(e*) 2/h and a compressibility kappa not-equal 0. These conclusions differ from the existing scaling theory as well as from simulations on simplified models argued to be in the same universality class. Our results are suggestive of new low lying collective excitations (modified from usual phonons) in the disordered system. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. JAMES FRANCK INST,CHICAGO,IL 60637. RP MAKIVIC, M (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. NR 41 TC 88 Z9 88 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 OCT 4 PY 1993 VL 71 IS 14 BP 2307 EP 2310 DI 10.1103/PhysRevLett.71.2307 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700036 ER PT J AU CHOU, FC BORSA, F CHO, JH JOHNSTON, DC LASCIALFARI, A TORGESON, DR ZIOLO, J AF CHOU, FC BORSA, F CHO, JH JOHNSTON, DC LASCIALFARI, A TORGESON, DR ZIOLO, J TI MAGNETIC PHASE-DIAGRAM OF LIGHTLY DOPED LA2-XSRXCUO4 FROM LA-139 NUCLEAR-QUADRUPOLE RESONANCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON-SCATTERING; SPIN; RELAXATION; LA2CUO4; TRANSITION; PURE; NQR; NMR AB The magnetic phase diagram of La2-xSrxCuO4 in the antiferromagnetic regime (x less-than-or-equal-to 0.02) has been derived from La-139 nuclear quadrupole resonance studies from 4 to 250 K. The data demonstrate freezing of the doped holes' effective spin degrees of freedom below T(f) almost-equal-to (815 K)x into a spin-glass-like state which is superimposed on the antiferromagnetic background. These and previous results allow a detailed magnetic phase diagram to be constructed for x less-than-or-equal-to 0.05 and reveal a distinct crossover at x almost-equal-to 0.02 in the nature of the spin-glass transition. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. RP CHOU, FC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 25 TC 140 Z9 140 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 OCT 4 PY 1993 VL 71 IS 14 BP 2323 EP 2326 DI 10.1103/PhysRevLett.71.2323 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700040 ER PT J AU BERNSTEIN, LJ DELONG, KW FINLAYSON, N AF BERNSTEIN, LJ DELONG, KW FINLAYSON, N TI SELF-TRAPPING TRANSITIONS IN A DISCRETE NLS MODEL WITH LOCALIZED INITIAL CONDITIONS SO PHYSICS LETTERS A LA English DT Article ID NONLINEAR SCHRODINGER-EQUATION; DIRECTIONAL COUPLER; MOLECULAR CHAINS; SOLITON; CHAOS AB We present a simple formula for estimating the location of a self-trapping transition for a discrete nonlinear Schrodinger equation. We test our formula numerically and against results from past analytical and numerical investigations of related models. The effects of boundary conditions on self-trapping efficiency are also discussed. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. BT LABS,IPSWICH IP5 7RE,ENGLAND. RP BERNSTEIN, LJ (reprint author), IDAHO STATE UNIV,DEPT MATH,POCATELLO,ID 83209, USA. NR 29 TC 10 Z9 10 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD OCT 4 PY 1993 VL 181 IS 2 BP 135 EP 141 DI 10.1016/0375-9601(93)90910-R PG 7 WC Physics, Multidisciplinary SC Physics GA MB418 UT WOS:A1993MB41800008 ER PT J AU ANDREEV, V KHARCHEV, S SHMAKOVA, M AF ANDREEV, V KHARCHEV, S SHMAKOVA, M TI CLOSED CHAINS OF SUPERSYMMETRICAL HAMILTONIANS SO PHYSICS LETTERS A LA English DT Article ID QUANTUM-MECHANICS AB We consider systems for which closed chains of supersymmetrical Hamiltonians can be constructed. Applications of this theory for quantum optics, one-dimensional quantum mechanics and the theory of factorization of differential operators are presented. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP ANDREEV, V (reprint author), PN LEBEDEV PHYS INST,MOSCOW 117924,RUSSIA. RI Andreev, Vladimir/M-7036-2015; Andreev, Vladimir/B-7861-2017 NR 13 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD OCT 4 PY 1993 VL 181 IS 2 BP 142 EP 148 DI 10.1016/0375-9601(93)90911-I PG 7 WC Physics, Multidisciplinary SC Physics GA MB418 UT WOS:A1993MB41800009 ER PT J AU LIU, LC AF LIU, LC TI ETA-NUCLEON INTERACTION AND NUCLEAR PRODUCTION OF ETA MESONS SO ACTA PHYSICA POLONICA B LA English DT Article; Proceedings Paper CT International Conference on Meson-Nucleus Interactions CY MAY 14-19, 1992 CL KRAKOW, POLAND SP INST NUCL PHYS, JAGELLONIAN UNIV, INST KERNHYS, FORSCHUNGSZENTRUM JULICH ID MESIC NUCLEUS; THRESHOLD AB Eta-nucleon interaction and eta-nucleus dynamics are discussed. The possibility of using eta to probe unnatural-parity nuclear states and to study spin-isospin correlations between two nucleons are demonstrated. RP LIU, LC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-2,LOS ALAMOS,NM 87545, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD OCT-NOV PY 1993 VL 24 IS 10-11 BP 1545 EP 1554 PG 10 WC Physics, Multidisciplinary SC Physics GA MN781 UT WOS:A1993MN78100003 ER PT J AU PLENDL, HS NAIR, R GAVATHAS, EP LIU, LC ESTEP, RJ DROPESKY, BJ BOWMAN, JD KNUDSON, JN LIEB, BJ STRONACH, CE FUNSTEN, HO MCKENZIE, J AF PLENDL, HS NAIR, R GAVATHAS, EP LIU, LC ESTEP, RJ DROPESKY, BJ BOWMAN, JD KNUDSON, JN LIEB, BJ STRONACH, CE FUNSTEN, HO MCKENZIE, J TI SINGLE CHARGE-EXCHANGE FOLLOWING PI-CAPTURE SO ACTA PHYSICA POLONICA B LA English DT Article; Proceedings Paper CT International Conference on Meson-Nucleus Interactions CY MAY 14-19, 1992 CL KRAKOW, POLAND SP INST NUCL PHYS, JAGELLONIAN UNIV, INST KERNHYS, FORSCHUNGSZENTRUM JULICH AB To complement planned experiments in which deeply bound pionic atom states are to be produced, the reaction (pi-, pi0) was examined close to threshold. Branching ratios for that reaction on CH2, Al-27, P-31, S-32, Sc-45, and In-115 were determined experimentally. The results were compared with previous experimental work and with a calculation based on the Panofsky ratio. The results can be understood in terms of the shell structure of the target nuclei. C1 FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. GEORGE MASON UNIV,FAIRFAX,VA 22030. VIRGINIA STATE UNIV,PETERSBURG,VA 23803. COLL WILLIAM & MARY,WILLIAMSBURG,VA 23186. NR 14 TC 0 Z9 0 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD OCT-NOV PY 1993 VL 24 IS 10-11 BP 1649 EP 1657 PG 9 WC Physics, Multidisciplinary SC Physics GA MN781 UT WOS:A1993MN78100013 ER PT J AU MORRIS, CL ODONNELL, JM ZUMBRO, JD AF MORRIS, CL ODONNELL, JM ZUMBRO, JD TI PION-SCATTERING AT ENERGIES ABOVE THE DELTA-RESONANCE SO ACTA PHYSICA POLONICA B LA English DT Article; Proceedings Paper CT International Conference on Meson-Nucleus Interactions CY MAY 14-19, 1992 CL KRAKOW, POLAND SP INST NUCL PHYS, JAGELLONIAN UNIV, INST KERNHYS, FORSCHUNGSZENTRUM JULICH ID NUCLEI; EXCITATION AB The DELTA(1232) resonance dominates pion-nucleon scattering at energies below 300 MeV, the region in which pion-nucleus scattering has been well studied using spectrometers at the meson factories. Above this energy region few pion-nucleus scattering data exist. Recently, spectrometers at Brookhaven, LAMPF, KEK, and DUBNA have been used to obtain initial data for pion-nucleus scattering in this energy region. In this talk, we review some data that have been obtained using the LAS spectrometer at LAMPF. RP MORRIS, CL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD OCT-NOV PY 1993 VL 24 IS 10-11 BP 1659 EP 1671 PG 13 WC Physics, Multidisciplinary SC Physics GA MN781 UT WOS:A1993MN78100014 ER PT J AU LIANG, GL NOID, DW SUMPTER, BG WUNDERLICH, B AF LIANG, GL NOID, DW SUMPTER, BG WUNDERLICH, B TI ATOMISTIC DETAILS OF DISORDERING PROCESSES IN SUPERHEATED POLYMETHYLENE CRYSTALS SO ACTA POLYMERICA LA English DT Article ID MOLECULAR-DYNAMICS CALCULATIONS; COMPUTER-SIMULATION; CONFORMATIONAL DISORDER; NORMAL-ALKANES; POLYETHYLENE; MOTIONS; CHAINS; PHASE AB Atomistic details of disordering in superheated polymethylene crystals have been studied using molecular dynamics simulations. Superheating causes a quick development of large-scale disorder throughout the crystal, including reorientation, translation, and the destruction of crystal symmetry, followed ultimately by surface melting. Crystallization-centers with hexagonal packing are found in the superheated, unconstrained crystals. On cooling during the simulation, a recrystallization process competes with the disordering resulting in a reorientation of the molecular chains and reorganization of the crystal. ''The submitted manuscript has been authored by a contractor of the U.S. Government under contract No. DE-AC05-84OR-21400. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes.'' C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP LIANG, GL (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 49 TC 15 Z9 15 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0323-7648 J9 ACTA POLYM JI Acta Polym. PD OCT PY 1993 VL 44 IS 5 BP 219 EP 224 DI 10.1002/actp.1993.010440502 PG 6 WC Polymer Science SC Polymer Science GA MD346 UT WOS:A1993MD34600002 ER PT J AU SUSZCYNSKY, DM BOROVSKY, JE GOERTZ, CK AF SUSZCYNSKY, DM BOROVSKY, JE GOERTZ, CK TI SECONDARY-ELECTRON YIELDS OF SOLAR-SYSTEM ICES SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article ID DUSTY PLASMAS; PARTICLES; EMISSION; GRAINS AB The charging dynamics of ice particles in plasmas (e.g. for planetary ring dynamics) is highly dependent upon the secondary-electron yields of the ices. To this end, the secondary-electron yields of H2O, CO2, NH3 (ammonia) and CH3OH (methanol) ices have been measured in a scanning electron microscope as a function of the electron-beam energy in the 2 30 keV energy range. Estimates are given for the maximum secondary-electron yield Y(max) of each ice and the energy E(max) at which this maximum yield occurs and the implications of these estimates are discussed in terms of solar system ices. Based on these results and a general literature review of Y(max) values for nonconducting materials, it is suggested that a typical range to quote for the secondary-electron yield of ices should be about 1-10. This is much lower than the range of 1-30 that is presently quoted in the space physics community. C1 UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA. RP LOS ALAMOS NATL LAB, SPACE PLASMA PHYS GRP, LOS ALAMOS, NM 87545 USA. NR 29 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD OCT PY 1993 VL 13 IS 10 BP 183 EP 187 PG 5 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA ML874 UT WOS:A1993ML87400024 ER PT J AU GEORGE, AC AF GEORGE, AC TI RADON PROGENY PARTICLE GROWTH IN THE SIMULATED ENVIRONMENT OF THE RESPIRATORY-TRACT SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID RELATIVE-HUMIDITY; DEPOSITION; AEROSOLS; TEMPERATURE; AIRWAYS AB To determine the magnitude of induced particle growth of radon progeny, a simulator was constructed to create and maintain conditions similar to those prevailing in the respiratory tract. During testing, the conditioned metal simulator was connected to a radon chamber in which different test aerosols were mixed with radon progeny. The exhaust rate from the radon chamber and through the simulator test chamber ranged from 0.1 to 0.15 m3/min. The residence time of the radon progeny attached to the test aerosol in the air space of the simulator ranged from 1.0 to 1.5 min. To measure particle growth, alternate tests were made in the simulator and in a second test chamber identical to the simulator but without the water. Particle size was measured with diffusion batteries and growth was determined from the difference in the activity median diameters of the radon progeny measured in the two test chambers. The results from tests using different aerosols showed average particle growth factors of 1.5 for room air, 1.8 when an electrical heater is operating, 1.7 when a methane gas burner is on, 2.0 while a kerosene lamp is lit, 1.6 while a candle is burning, 1.2 during cigar smoking, 2.8 when a NaCl generator is on, 1.0 in the presence of wax aerosol, and 1.05 in the presence of very young radon progeny from freshly filtered radon gas. This study shows that, as a result of particle growth, deposition in the tracheobronchial region of the respiratory tract and the radiation dose from radon progeny attached to ordinary room air aerosol is reduced by an average value of 25%. RP GEORGE, AC (reprint author), US DOE,ENVIRONM MEASURES LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 21 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD OCT PY 1993 VL 19 IS 3 BP 351 EP 361 DI 10.1080/02786829308959642 PG 11 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA MA046 UT WOS:A1993MA04600012 ER PT J AU PERONA, JJ AF PERONA, JJ TI MODEL FOR SR-CS-CA-MG-NA ION-EXCHANGE EQUILIBRIA ON CHABAZITE SO AICHE JOURNAL LA English DT Article AB Chabazite zeolites are used at Oak Ridge National Laboratory to decontaminate wastewaters containing Sr-90 and Cs-137. Treatability studies show that chabazite can remove trace amounts of these nuclides from wastewaters containing much higher concentrations of calcium and magnesium. The design of ion-exchange columns for multicomponent systems requires a method for predicting multicomponent equilibria from binary, ternary and quaternary experiments, since the number of experiments required for an empirical equilibrium model is not generally feasible. Binary interaction parameters for the Wilson equation are used to predict solid-phase activity coefficients for the five-component system. The sum of squares of deviations between experimental and predicted solution concentrations for the data points available is calculated. The average deviation per data point for the five-component system is lower than for some of the ternary- and four-component data sets containing calcium or magnesium. RP PERONA, JJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 5 TC 19 Z9 19 U1 0 U2 1 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD OCT PY 1993 VL 39 IS 10 BP 1716 EP 1720 DI 10.1002/aic.690391015 PG 5 WC Engineering, Chemical SC Engineering GA MA180 UT WOS:A1993MA18000014 ER PT J AU MURPHY, E KORBER, B GEORGESCOURBOT, MC YOU, B PINTER, A COOK, D KIENY, MP GEORGES, A MATHIOT, C BARRESINOUSSI, F GIRARD, M AF MURPHY, E KORBER, B GEORGESCOURBOT, MC YOU, B PINTER, A COOK, D KIENY, MP GEORGES, A MATHIOT, C BARRESINOUSSI, F GIRARD, M TI DIVERSITY OF V3 REGION SEQUENCES OF HUMAN IMMUNODEFICIENCY VIRUSES TYPE-1 FROM THE CENTRAL-AFRICAN-REPUBLIC SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Article ID PRINCIPAL NEUTRALIZING DETERMINANT; HUMAN MONOCLONAL-ANTIBODIES; MACROPHAGE TROPISM; ENVELOPE SEQUENCE; MONONUCLEAR-CELLS; HIV-1; GP120; DOMAIN; LOOP; CHIMPANZEES AB Nucleotide sequences of the central portion of gp120, including the third hypervariable (V3) loop, were obtained from lymphocytes cocultivated with SupT1 cells from 29 AIDS patients in Bangui, Central African Republic. These sequences displayed significantly greater diversity (average distance, 23%) than has been previously observed in isolates from comparably restricted geographical areas. Isolates belonging to four major subtypes of HIV-1 were found; the only subtype not represented was the North American/European subtype B. Unlike the situation in Zaire and Uganda, where subtypes A and D account equally for virtually all isolates of HIV-1, the predominant subtypes in the Central African Republic, accounting for two-thirds of the isolates, were subtypes A (10 isolates) and E (9 isolates). Subtype E represents a group of variants that have previously been found only in Thailand. Only one isolate belonging to subtype D was found. Also recovered were two isolates of subtype C, a subtype associated with southern African and Indian isolates but not previously detected in central Africa. These isolates, although clearly clustering with subtype C, formed a distinct subset, differing from one another by 8.8% and from the Indian and South African subtype C isolates by an average of 22.5%. High interpatient, intrasubtype variation was also seen among the CAR subtype A (average pairwise difference, 19.3%) and subtype E (10.9%) isolates. The diversity of V3 sequences in this set has implications for immunization protocols that rely on the recognition of V3. This study underscores the necessity of basing intervention strategies on knowledge of the particular sequences present in the target population or geographical area. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SANTA FE INST,SANTA FE,NM 87501. RP MURPHY, E (reprint author), PUBL HLTH RES INST CITY NEW YORK INC,455 1ST AVE,NEW YORK,NY 10016, USA. RI Barre-Sinoussi, Francoise/G-8355-2011; OI Korber, Bette/0000-0002-2026-5757 FU NIAID NIH HHS [AI23884, AI27742] NR 53 TC 119 Z9 123 U1 0 U2 5 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD OCT PY 1993 VL 9 IS 10 BP 997 EP 1006 DI 10.1089/aid.1993.9.997 PG 10 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA MF842 UT WOS:A1993MF84200009 PM 8280481 ER PT J AU KORBER, B GIFFORD, A MYERS, G AF KORBER, B GIFFORD, A MYERS, G TI PATTERNS OF VARIATION AMONG INTERNATIONAL ISOLATES IN THE HIGHLY IMMUNOGENIC V3 REGION OF THE HIV-1 ENVELOPE PROTEIN SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 0 TC 5 Z9 5 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD OCT PY 1993 VL 9 SU 1 BP S98 EP S98 PG 1 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA ME188 UT WOS:A1993ME18800078 ER PT J AU WINOKUR, ST SCHUTTE, B WEIFFENBACH, B WASHINGTON, SS MCELLIGOTT, D CHAKRAVARTI, A WASMUTH, JH ALTHERR, MR AF WINOKUR, ST SCHUTTE, B WEIFFENBACH, B WASHINGTON, SS MCELLIGOTT, D CHAKRAVARTI, A WASMUTH, JH ALTHERR, MR TI A RADIATION HYBRID MAP OF 15-LOCI ON THE DISTAL LONG ARM OF CHROMOSOME-4, THE REGION CONTAINING THE GENE RESPONSIBLE FOR FACIOSCAPULOHUMERAL MUSCULAR-DYSTROPHY (FSHD) SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID HUNTINGTON DISEASE GENE; DNA-SEQUENCE; LINKAGE; MARKERS; LOCI; 4Q35; TRANSLOCATION; 4Q35-QTER AB A physical map of 4q35 was constructed through radiation hybrid analysis of 134 clones generated from the cell line HHW416, a chromosome 4-only human-hamster somatic cell hybrid. This subtelomeric region contains the as-yet-unidentified gene responsible for facioscapulohumeral muscular dystrophy. The most likely order of 15 loci within 4q35 was determined. The loci ordered on this radiation hybrid map include both genes and polymorphic loci, as well as monomorphic loci which cannot be placed on a genetic linkage map. The physical distance spanning these loci was estimated to be approximately 4.5 Mb, by using a kilobase/centiray conversion factor derived from 4p16.3 marker analysis through the same set of radiation hybrids. The comparison of this physical map to establish genetic maps suggests that this region is smaller than initially estimated and that recombination rates are increased near the telomere. C1 LOS ALAMOS NATL LAB,GENOM & STRUCT BIOL GRP,TA43 HRL1 LS2,MAIL STOP M880,LOS ALAMOS,NM 87545. UNIV CALIF IRVINE,DEPT BIOL CHEM,IRVINE,CA 92717. UNIV IOWA,DEPT PEDIAT,IOWA CITY,IA 52242. COLL ABORAT RES,WALTHAM,MA. UNIV PITTSBURGH,DEPT HUMAN GENET & PSYCHIAT,PITTSBURGH,PA 15260. SALK INST BIOL STUDIES,MOLEC BIOL LAB,LA JOLLA,CA 92037. FU NICHD NIH HHS [HD28088]; NIGMS NIH HHS [GM07311-18] NR 36 TC 27 Z9 27 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 OCT PY 1993 VL 53 IS 4 BP 874 EP 880 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA LY627 UT WOS:A1993LY62700011 PM 8213815 ER PT J AU WILLIAMS, R VESA, J JARVELA, I MCKAY, T MITCHISON, H HELLSTEN, E THOMPSON, A CALLEN, D SUTHERLAND, G LUNABATTADANO, D STALLINGS, R PELTONEN, L GARDINER, M AF WILLIAMS, R VESA, J JARVELA, I MCKAY, T MITCHISON, H HELLSTEN, E THOMPSON, A CALLEN, D SUTHERLAND, G LUNABATTADANO, D STALLINGS, R PELTONEN, L GARDINER, M TI GENETIC-HETEROGENEITY IN NEURONAL CEROID-LIPOFUSCINOSIS (NCL) - EVIDENCE THAT THE LATE-INFANTILE SUBTYPE (JANSKY-BIELSCHOWSKY DISEASE CLN2) IS NOT AN ALLELIC FORM OF THE JUVENILE OR INFANTILE SUBTYPES SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID BATTEN DISEASE; HUMAN CHROMOSOME-16; LINKAGE; VARIANT; LOCUS; MAPS AB The neuronal ceroid lipofuscinoses (NCLs) are a group of inherited neurodegenerative disorders characterized by the accumulation of autofluorescent lipopigment in neurons and other cell types. Inheritance is autosomal recessive. Three main childhood subtypes are recognized: infantile (Haltia-Santavuori disease; MIM 256743), late infantile (Jansky-Bielschowsky disease; MIM 204500), and juvenile (Spielmeyer-Sjogren-Vogt, or Batten, disease; MIM 204200). The gene loci for the juvenile (CLN3) and infantile (CLN1) types have been mapped to human chromosomes 16p and lp, respectively, by linkage analysis. Linkage analysis of 25 families segregating for late-infantile NCL has excluded these regions as the site of this disease locus (CLN2). The three childhood subtypes of NCL therefore arise from mutations at distinct loci. C1 UNIV LONDON UNIV COLL,SCH MED,RAYNE INST,DEPT PAEDIAT,UNIV ST,LONDON WC1E 6JJ,ENGLAND. NATL PUBL HLTH INST,DEPT HUMAN MOLEC GENET,SF-00280 HELSINKI 28,FINLAND. WOMEN & CHILDRENS HOSP,DEPT CYTOGENET & MOLEC GENET,CTR MED GENET,ADELAIDE,AUSTRALIA. HOSP NACL NINOS DR CARLOS SAENZ HERRERA,CAJA COSTARRICENSE SEGURO SOCIAL,SAN JOSE,COSTA RICA. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87544. RI Mitchison, Hannah/C-1891-2008; Sutherland, Grant/D-2606-2012; Callen, David/G-1975-2012; Stallings, Raymond/A-7213-2008; Jarvela, Irma/L-5836-2013 NR 17 TC 23 Z9 23 U1 1 U2 2 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 OCT PY 1993 VL 53 IS 4 BP 931 EP 935 PG 5 WC Genetics & Heredity SC Genetics & Heredity GA LY627 UT WOS:A1993LY62700018 PM 8213822 ER PT J AU CHEN, WYC AF CHEN, WYC TI RESTRICTED BLOCK-WALKING SO AMERICAN MATHEMATICAL MONTHLY LA English DT Letter RP CHEN, WYC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATHEMATICAL ASSOC AMER PI WASHINGTON PA 1529 18TH STREET NW, WASHINGTON, DC 20036 SN 0002-9890 J9 AM MATH MON JI Am. Math. Mon. PD OCT PY 1993 VL 100 IS 8 BP 800 EP 800 PG 1 WC Mathematics SC Mathematics GA LZ496 UT WOS:A1993LZ49600014 ER PT J AU FRAZER, NB GREENE, JL GIBBONS, JW AF FRAZER, NB GREENE, JL GIBBONS, JW TI TEMPORAL VARIATION IN GROWTH-RATE AND AGE AT MATURITY OF MALE PAINTED TURTLES, CHRYSEMYS-PICTA SO AMERICAN MIDLAND NATURALIST LA English DT Article ID LIFE-HISTORY TRAITS; PHENOTYPIC PLASTICITY; ORDER TESTUDINES; NESTING ECOLOGY; MUD TURTLE; EVOLUTIONARY; SIZE; DEMOGRAPHY; REPRODUCTION; SURVIVORSHIP AB Growth rates of juveniles and age at maturity of males were examined in a population of painted turtles, Chrysemys picta, inhabiting a marsh in southwestern Michigan (approximately 42 degrees 24'N, 85 degrees 24'W) to compare temporal variation in these two important life history traits within a decade. Elongation of the third right foreclaw was used as an indicator of incipient sexual maturity of males. Males in the late 1980s reached maturity at least a year earlier than did those in the early 1980s. Analysis of climatological data revealed that growing seasons in the late 1980s were typically warmer and longer than in the early years of the decade. The observed changes in juvenile growth rates and age at maturity of male C. picta are in accord with recent field and laboratory studies of emydid turtles. They also support predictions of life history theory, and may serve as working hypotheses that can be tested with data from other long-term projects. If substantiated, these patterns may indicate how some freshwater turtle populations in temperate latitudes might respond to predicted global warming trends. RP FRAZER, NB (reprint author), SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29802, USA. NR 52 TC 29 Z9 29 U1 0 U2 11 PU AMER MIDLAND NATURALIST PI NOTRE DAME PA UNIV NOTRE DAME, BOX 369, ROOM 295 GLSC, NOTRE DAME, IN 46556 SN 0003-0031 J9 AM MIDL NAT JI Am. Midl. Nat. PD OCT PY 1993 VL 130 IS 2 BP 314 EP 324 DI 10.2307/2426130 PG 11 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA ME264 UT WOS:A1993ME26400009 ER PT J AU DEBIASE, AE TAYLOR, BE AF DEBIASE, AE TAYLOR, BE TI NEW OCCURRENCES OF EURYTEMORA-AFFINIS AND EPISCHURA-FLUVIATILIS, FRESH-WATER CALANOID COPEPOD SPECIES OF THE FAMILY TEMORIDAE, IN SOUTH-CAROLINA SO AMERICAN MIDLAND NATURALIST LA English DT Article ID POPPE AB In a 1990 survey of calanoid copepods of the Savannah River Site on the upper coastal plain of South Carolina, two members of the family Temoridae, Eurytemora affinis and Epischura fluviatilis, were collected from large (>65 ha) reservoirs. Neither species occurred in small (<5 ha) man-made ponds nor in Carolina bays and other natural wetland ponds. Neither species was reported from extensive studies on the large reservoirs in the mid-1980s, although Eurytemora affinis appeared in 1987 in a 2-yr-old reservoir. Eurytemora affinis is a widely distributed coastal species. Epischura fluviatilis has rarely been reported, and its distribution is poorly known. The appearance of these two species on the Savannah River Site, and perhaps in inland South Carolina more generally, may be associated with the construction of reservoirs, which provide a kind of aquatic habitat that did not exist in this region before the mid-20th century. RP DEBIASE, AE (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 30 TC 6 Z9 6 U1 0 U2 0 PU AMER MIDLAND NATURALIST PI NOTRE DAME PA UNIV NOTRE DAME, BOX 369, ROOM 295 GLSC, NOTRE DAME, IN 46556 SN 0003-0031 J9 AM MIDL NAT JI Am. Midl. Nat. PD OCT PY 1993 VL 130 IS 2 BP 386 EP 392 DI 10.2307/2426136 PG 7 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA ME264 UT WOS:A1993ME26400015 ER PT J AU WINEMILLER, KO ROSE, KA AF WINEMILLER, KO ROSE, KA TI WHY DO MOST FISH PRODUCE SO MANY TINY OFFSPRING SO AMERICAN NATURALIST LA English DT Article ID HADDOCK MELANOGRAMMUS-AEGLEFINUS; VARIABLE ENVIRONMENTS; EGG SIZE; MARINE FISHES; PARENTAL CARE; LARVAL SIZE; EARLY LIFE; ZOOPLANKTON; STRATEGIES; NUMBER AB A simulation model containing size-based rules for foraging. growth, and probability of survival was created to track the fates of pelagic larval fish. The relative success of cohorts comprised of equivalent initial biomass but containing different numbers and sizes of first-feeding larvae was compared in environments having different levels of patchiness and densities of food resources. In environments containing randomly distributed prey, the rate of growth and probability of survival were always greater, and duration of the larval stage was shorter for larger larvae due to the size-based rules. Broods comprised of fewer but larger first-feeding larvae resulted in the greatest number of survivors in low-prey-density environments. In prey-rich environments, broods containing the same initial biomass divided into greater numbers of small first-feeding larvae resulted in more survivors. This result occurred despite the fact that. on a per-individual basis, survival rate was much lower initially in larger broods. We used a negative binomial algorithm to generate encounter probabilities with patchily distributed prey on small spatial scales in which the previous day's experiences had no relationship to current probabilities for encounter. In prey-poor environments, the strategy of producing fewer large larvae was superior at all levels of small-scale prey patchiness. In prey-rich environments, broods containing larger numbers of smaller larvae resulted in more survivors in simulations for randomly distributed and moderately clumped prey. With greater clumping of prey, the greatest number of survivors resulted from the strategy of producing fewer but larger larvae. To examine the effect of large-scale prey patchiness, we solved for the percentage of a larval cohort that would have to settle and remain within a prey-rich patch, in order for a strategy of producing many small larvae to yield more survivors than a strategy of producing fewer larger larvae under the same conditions. When prey patches contained 200 prey/L (compared with 50 prey/L outside) and as few as 1% of the brood settled into the prey-rich patches, large broods comprised of 3-mm larvae yielded more survivors than small broods comprised of 10-mm larvae. Our simulations indicate that the superior evolutionary strategy is the investment in larger numbers of smaller eggs when resources are patchy on a relatively large spatial scale. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI Langerhans, R./A-7205-2009; OI Winemiller, Kirk/0000-0003-0236-5129 NR 63 TC 93 Z9 99 U1 0 U2 24 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0003-0147 J9 AM NAT JI Am. Nat. PD OCT PY 1993 VL 142 IS 4 BP 585 EP 603 DI 10.1086/285559 PG 19 WC Ecology; Evolutionary Biology SC Environmental Sciences & Ecology; Evolutionary Biology GA ME494 UT WOS:A1993ME49400002 PM 19425962 ER PT J AU DEANGELIS, DL ROSE, KA CROWDER, LB MARSCHALL, EA LIKA, D AF DEANGELIS, DL ROSE, KA CROWDER, LB MARSCHALL, EA LIKA, D TI FISH COHORT DYNAMICS - APPLICATION OF COMPLEMENTARY MODELING APPROACHES SO AMERICAN NATURALIST LA English DT Article ID SIZE DISTRIBUTIONS; MECHANISMS; SURVIVAL; BLOATER; GROWTH; RATES AB The recruitment to the adult stock of a fish population is a function of both environmental conditions and the dynamics of juvenile fish cohorts. These dynamics can be quite complicated and involve the size structure of the cohort. Two types of models, i-state distribution models (e.g., partial differential equations) and i-state configuration models (computer simulation models following many individuals simultaneously), have been developed to study this type of question. However, these two model types have not to our knowledge previously been compared in detail. Analytical solutions are obtained for three partial differential equation models of early life-history fish cohorts. Equivalent individual-by-individual computer simulation models are also used. These two approaches can produce similar results, which suggests that one may be able to use the approaches interchangeably under many circumstances. Simple uncorrelated stochasticity in daily growth is added to the individual-by-individual models, and it is shown that this produces no significant difference from purely deterministic situations. However, when the stochasticity was temporally correlated such that a fish growing faster than the mean 1 d has a tendency to grow faster than the mean the next day, there can be great differences in the outcomes of the simulations. C1 N CAROLINA STATE UNIV,DEPT ZOOL,RALEIGH,NC 27695. UNIV TENNESSEE,DEPT MATH,KNOXVILLE,TN 37996. RP DEANGELIS, DL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Marschall, Elizabeth/A-1608-2014 OI Marschall, Elizabeth/0000-0002-8026-4203 NR 28 TC 75 Z9 77 U1 2 U2 7 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0003-0147 J9 AM NAT JI Am. Nat. PD OCT PY 1993 VL 142 IS 4 BP 604 EP 622 DI 10.1086/285560 PG 19 WC Ecology; Evolutionary Biology SC Environmental Sciences & Ecology; Evolutionary Biology GA ME494 UT WOS:A1993ME49400003 ER PT J AU MASON, PB ZHANG, LM CARNAHAN, JW WINANS, RE AF MASON, PB ZHANG, LM CARNAHAN, JW WINANS, RE TI HELIUM MICROWAVE-INDUCED PLASMA-ATOMIC EMISSION DETECTION FOR LIQUID-CHROMATOGRAPHY UTILIZING A MOVING BAND INTERFACE SO ANALYTICAL CHEMISTRY LA English DT Article ID GAS-CHROMATOGRAPHY AB A moving band interface is used to separate HPLC solvent from analyte before introduction into a microwave-induced plasma atomic emission detector. Spectral scans indicate that all detectable solvent is removed prior to analyte introduction. Analyte memory effects are not detectable. Chlorine element selective detection limits are 140,410, 220, and 770 pg/s for 9-chlorofluorene, p-chlorobiphenyl, 4-chlorobenzophenone, and alpha,alpha-dichloro-o-oxylene, respectively. If the vaporization region is heated significantly, chlorine selective response is dependent upon the boiling point of the compound due to analyte volatilization before it reaches the detector. C1 NO ILLINOIS UNIV,DEPT CHEM,DE KALB,IL 60115. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 18 TC 10 Z9 10 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 OCT 1 PY 1993 VL 65 IS 19 BP 2596 EP 2600 DI 10.1021/ac00067a009 PG 5 WC Chemistry, Analytical SC Chemistry GA LZ670 UT WOS:A1993LZ67000012 ER PT J AU JACOBSON, AR ERICKSON, WC AF JACOBSON, AR ERICKSON, WC TI OBSERVATIONS OF ELECTRON-DENSITY IRREGULARITIES IN THE PLASMASPHERE USING THE VLA RADIO INTERFEROMETER SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Article ID LARGE ARRAY; RADIOTELESCOPE; SATELLITE; WAVES AB Transverse irregularities in the line-of-sight total electron content have been studied with the Very Large Array radio-interferometer. Unresolved cosmic radio sources are used to back-illuminate the geoplasma. The baseline-differenced electrical phase time series are Fourier analyzed and then used to fit the constants (amplitude and trace wavevector) for a planewave model at each frequency. At frequencies >0.003 Hz, i.e. above the spectral region dominated by atmospheric gravity waves, the VLA database reveals a distinct class of irregularities with apparent propagation azimuths within +/-15-degrees of magnetic cast and with trace propagation speeds in the range 0.1-1.5 km s-1. It is shown that these magnetic eastward directed (MED) irregularities cannot be explained as any perturbation generated by compressional waves at ionospheric heights. An alternative model is proposed, wherein they are geomagnetically-aligned irregularities essentially ''frozen'' in the plasmasphere, corotating with the Earth. The relative motion of the radio lines-of-sight past the corotating irregularities produces exactly the class of ''high-frequency'' disturbances seen at > 0.003 Hz. The frequency, and the trace speed, are artifacts of the relative motion of the line-of-sight. The trace speed can be used to infer where, along the line-of-sight, the irregularity occurs. This tool allows statistics of the location, shape, and incidence of the irregularities to be studied in some detail. C1 UNIV TASMANIA,DEPT PHYS,HOBART,TAS 7001,AUSTRALIA. RP JACOBSON, AR (reprint author), LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,SPACE & ATMOSPHER SCI GRP,MAIL STOP D466,LOS ALAMOS,NM 87545, USA. NR 17 TC 27 Z9 27 U1 0 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD OCT PY 1993 VL 11 IS 10 BP 869 EP 888 PG 20 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA MC072 UT WOS:A1993MC07200001 ER PT J AU BUSH, BW NIX, JR AF BUSH, BW NIX, JR TI CLASSICAL HADRODYNAMICS - FOUNDATIONS OF THE THEORY SO ANNALS OF PHYSICS LA English DT Article ID ELECTROMAGNETIC-FIELD MOMENTUM; RADIATION REACTION; ELECTRODYNAMICS; DEFINITION; ELECTRON; MODEL RP BUSH, BW (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Bush, Brian/0000-0003-2864-7028 NR 81 TC 5 Z9 5 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 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD OCT PY 1993 VL 227 IS 1 BP 97 EP 150 DI 10.1006/aphy.1993.1077 PG 54 WC Physics, Multidisciplinary SC Physics GA MC604 UT WOS:A1993MC60400003 ER PT J AU TOPP, E HANSON, RS RINGELBERG, DB WHITE, DC WHEATCROFT, R AF TOPP, E HANSON, RS RINGELBERG, DB WHITE, DC WHEATCROFT, R TI ISOLATION AND CHARACTERIZATION OF AN N-METHYLCARBAMATE INSECTICIDE-DEGRADING METHYLOTROPHIC BACTERIUM SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID GRAM-NEGATIVE BACTERIA; INSERTION-SEQUENCE ISRM1; HYDROXY FATTY-ACIDS; RHIZOBIUM-MELILOTI; ENHANCED BIODEGRADATION; CARBOFURAN HYDROLASE; MICROBIAL-GROWTH; IDENTIFICATION; METABOLISM; PSEUDOMONAS AB A gram-negative bacterium which hydrolyzed aryl N-methylcarbamate insecticides was isolated from an agricultural soil which quickly degraded these pesticides. This organism, designated strain ER2, grew on carbofuran as a sole source of carbon and nitrogen with a doubling time of 3 h in a mineral salts medium. The aromatic nucleus of the molecule was not metabolized, and carbofuran 7-phenol accumulated as the end product of metabolism. The insecticides carbaryl, bendiocarb, and propoxur were similarly hydrolyzed, with each yielding the corresponding phenol. Strain ER2 contained two plasmids (120 and 130 kb). A probe cloned from the pDL11 plasmid of Achromobacter sp. strain WM111, which encodes the carbofuran hydrolase (mcd) gene (P. H. Tomasek and J. S. Karns, J. Bacteriol. 171:4038-4044, 1989), hybridized to the 120-kb plasmid. Restriction fragment profiles of PDL11 and strain ER2 plasmid DNAs suggested that the 120-kb plasmid of strain ER2 is very similar to pDL11. On the basis of the results of biochemical tests, 16S rRNA sequence analysis, and membrane lipid analyses, strain ER2 was found to be a phylogenetically unique type II methylotroph. The constitutive carbofuran hydrolase activity in glucose-grown cells increased sevenfold when strain ER2 was grown in the presence of 100 mg of carbofuran per liter as the sole source of carbon and nitrogen or as the sole nitrogen source in the presence of glucose. Growth on carbofuran resulted in the induction of enzymes required for methylamine-dependent respiration and the serine pathway of formaldehyde assimilation. These results indicate that the carbofuran hydrolase mcd gene is conserved on a plasmid found in organisms from different geographic areas and that the specific activity of carbofuran degradation may increase in response to carbofuran treatment. C1 AGR CANADA,RES BRANCH,PLANT RES CTR,CENT EXPTL FARM,OTTAWA K1A 0C6,ONTARIO,CANADA. UNIV TENNESSEE,OAK RIDGE NATL LAB,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. UNIV MINNESOTA,GRAY FRESHWATER BIOL INST,NAVARRE,MN 55392. RP TOPP, E (reprint author), AGR CANADA,CTR LAND & BIOL RESOURCES RES,CENT EXPTL FARM,OTTAWA K1A 0C6,ONTARIO,CANADA. OI Topp, Ed/0000-0002-8273-9372 NR 60 TC 41 Z9 44 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 OCT PY 1993 VL 59 IS 10 BP 3339 EP 3349 PG 11 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA MA353 UT WOS:A1993MA35300026 PM 7504430 ER PT J AU CHOW, R FALABELLA, S LOOMIS, GE RAINER, F STOLZ, CJ KOZLOWSKI, MR AF CHOW, R FALABELLA, S LOOMIS, GE RAINER, F STOLZ, CJ KOZLOWSKI, MR TI REACTIVE EVAPORATION OF LOW-DEFECT DENSITY HAFNIA SO APPLIED OPTICS LA English DT Article DE OPTICAL THIN FILMS; ABSORPTION; LASER DAMAGE THRESHOLD; ACTIVATED OXYGEN ID FILMS; TIO2 AB Motivation for this work includes observations at Lawrence Livermore National Laboratory of a correlation between laser damage thresholds and both the absorption and the nodular-defect density of coatings. Activated oxygen is used to increase the metal-oxidation kinetics at the coated surface during electron-beam deposition. A series of hafnia layers are made with various conditions: two mu-wave configuations, two sources (hafnium and hafnia), and two reactive oxygen pressures. Laser damage thresholds (1064-nm, 10-ns pulses), absorption (at 511 nm), and nodular-defect densities from these coatings are reported. The damage thresholds are observed to increase as the absorption of the coatings decreases. However, no significant increase in damage thresholds are observed with the coatings made from a low nodular-defect density source material (hafnium). Hafnia coatings can be made from hafnium sources that have lower nodular-defect densities, lower absorption, and damage thresholds that are comparable with coatings made from a conventional hafnia source. RP CHOW, R (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. NR 16 TC 100 Z9 114 U1 1 U2 8 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 OCT 1 PY 1993 VL 32 IS 28 BP 5567 EP 5574 PG 8 WC Optics SC Optics GA LZ497 UT WOS:A1993LZ49700021 PM 20856370 ER PT J AU STOLZ, CJ TAYLOR, JR EICKELBERG, WK LINDH, JD AF STOLZ, CJ TAYLOR, JR EICKELBERG, WK LINDH, JD TI EFFECTS OF VACUUM EXPOSURE ON STRESS AND SPECTRAL SHIFT OF HIGH REFLECTIVE COATINGS SO APPLIED OPTICS LA English DT Article ID ION-ASSISTED DEPOSITION; THIN-FILMS; OPTICAL COATINGS AB Coating stress and spectral shift are affected by changing from ambient to vacuum environments. This change can affect optical systems that are aligned in air and used m a vacuum or m a dry environment. Spectral shifts up to 3% and reflected wave-front changes up to 0.35 waves peak to valley are reported for conventional electron-beam deposition and ion-assisted deposition. Alternatively, ion-beam sputtered coatings have virtually no changes between different pressure environments. RP STOLZ, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB, L-463, POB 808, LIVERMORE, CA 94550 USA. NR 30 TC 22 Z9 24 U1 2 U2 5 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 OCT 1 PY 1993 VL 32 IS 28 BP 5666 EP 5672 PG 7 WC Optics SC Optics GA LZ497 UT WOS:A1993LZ49700035 PM 20856384 ER PT J AU DANEHY, PM FRIEDMANHILL, EJ LUCHT, RP FARROW, RL AF DANEHY, PM FRIEDMANHILL, EJ LUCHT, RP FARROW, RL TI THE EFFECTS OF COLLISIONAL QUENCHING ON DEGENERATE 4-WAVE-MIXING SO APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY LA English DT Article ID OH; FLAME; TEMPERATURE; BAND; FLUORESCENCE; DEPENDENCE AB We report a theoretical and experimental investigation of the effects of collisional quenching on resonant degenerate four-wave mixing (DFWM). Using single-mode laser radiation, peak signal intensity measurements were performed on an isolated line in the A-X transition of NO. By using appropriate mixtures of N2 and CO2 as buffer gases, we varied the collisional quenching rate over several orders of magnitude while maintaining a fixed total collisional dephasing rate. The mixtures had approximately 100 Torr total pressure and were at room temperature. For I/I(sat) approximately equal to 0.02, DFWM intensities were found to be less affected by variations in quench rate than were laser-induced fluorescence (LIF) intensities (I and I(sat) are the pump laser and one-photon saturation intensities, respectively). Moreover, for I/I(sat) roughly equal to 0.5, DFWM intensities were observed to be nearly independent of quench rate. The results are compared to two theoretical predictions, with good agreement observed. Both theories indicate that the minimum sensitivity of DFWM to quenching occurs near I/I(sat) almost-equal-to 1. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. RP DANEHY, PM (reprint author), STANFORD UNIV,HIGH TEMP GASDYNAM LAB,STANFORD,CA 94305, USA. NR 26 TC 59 Z9 59 U1 0 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0721-7269 J9 APPL PHYS B-PHOTO PD OCT PY 1993 VL 57 IS 4 BP 243 EP 248 DI 10.1007/BF00325202 PG 6 WC Physics, Applied SC Physics GA MC815 UT WOS:A1993MC81500001 ER PT J AU PAUL, PH GRAY, JA DURANT, JL THOMAN, JW AF PAUL, PH GRAY, JA DURANT, JL THOMAN, JW TI A MODEL FOR TEMPERATURE-DEPENDENT COLLISIONAL QUENCHING OF NO A(2)SIGMA+ SO APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY LA English DT Article ID LASER-INDUCED FLUORESCENCE; ELECTRON-AFFINITY; ROTATIONAL LEVELS; ENERGY-TRANSFER; RYDBERG STATES; NITRIC-OXIDE; OH; A2-SIGMA+; PHOTODETACHMENT; RELAXATION AB A model for the temperature-dependent electronic quenching of NO A2 SIGMA+ is presented. The model is appropriate for collision partners having stable negative ions, which are predicted to have large quenching cross-sections. Colliders with relatively large negative electron affinities are predicted to have cross-sections that are near-zero at room temperature and can increase dramatically at very high temperatures. A negligibly small electronic quenching cross-section is predicted for collision partners having negative ions that are unstable on a collisional timescale. Results of the model are compared to experimentally measured cross-sections for a number of species of interest in combustion and aerothermodynamic applications. C1 WILLIAMS COLL,DEPT CHEM,WILLIAMSTOWN,MA 01267. RP PAUL, PH (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550, USA. NR 66 TC 75 Z9 75 U1 1 U2 7 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0721-7269 J9 APPL PHYS B-PHOTO PD OCT PY 1993 VL 57 IS 4 BP 249 EP 259 DI 10.1007/BF00325203 PG 11 WC Physics, Applied SC Physics GA MC815 UT WOS:A1993MC81500002 ER PT J AU CULLEN, DE PERKINS, ST SELTZER, SM AF CULLEN, DE PERKINS, ST SELTZER, SM TI PHOTON AND ELECTRON DATA-BASES AND THEIR USE IN RADIATION TRANSPORT CALCULATIONS SO APPLIED RADIATION AND ISOTOPES LA English DT Article; Proceedings Paper CT 2ND TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS CY SEP 08-11, 1992 CL RALEIGH, NC SP AMER NUCL SOC, ISOTOPES & RADIAT DIV, AMER NUCL SOC, E CAROLINAS SECT, N CAROLINA STATE UNIV, CTR ENGN APPLICAT RADIOISOTOPES, TROXLER ELECTR LABS, TELEDYNE CORP, INT BUSINESS MACHINES, REUTER STOKES, SCHLUMBERGER DOLL RES AB The ENDF/B-VI photon interaction library includes data to describe the interaction of photons with the elements Z = 1-100 over the energy range 10 eV-100 MeV. This library has been designed to meet the traditional needs of users to model the interaction and transport of primary photons. However, this library contains additional information which, used in a combination with our other data libraries, can be used to perform much more detailed calculations, e.g. emission of secondary fluorescence photons. This paper describes both traditional and more detailed uses of this library. C1 NATL INST STAND & TECHNOL,CTR RADIAT RES,DIV IONIZING RADIAT,GAITHERSBURG,MD 20899. RP CULLEN, DE (reprint author), LAWRENCE LIVERMORE NATL LAB,L298,POB 808,LIVERMORE,CA 94550, USA. NR 4 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD OCT-NOV PY 1993 VL 44 IS 10-11 BP 1343 EP 1347 PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LZ642 UT WOS:A1993LZ64200011 ER PT J AU SPEAR, JD SILVA, RJ KLUNDER, GL RUSSO, RE AF SPEAR, JD SILVA, RJ KLUNDER, GL RUSSO, RE TI COLLINEAR PHOTOTHERMAL DEFLECTION SPECTROSCOPY OF LIQUID SAMPLES AT VARYING TEMPERATURE SO APPLIED SPECTROSCOPY LA English DT Article DE INSTRUMENTATION, PDS; PHOTOTHERMAL DEFLECTION SPECTROSCOPY; SPECTROSCOPIC TECHNIQUES AB The method of photothermal beam deflection was demonstrated for measuring the absorption spectrum of an aqueous Nd3+ solution at temperatures between 25-degrees-C and 90-degrees-C. Changes in the magnitude of the observed deflection can be correlated with the temperature dependence of both the absorptivity of the Nd3+ ions and the physical properties of the solvent, most notably the thermo-optic coefficient dn/dT. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 12 TC 9 Z9 9 U1 1 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1993 VL 47 IS 10 BP 1580 EP 1584 DI 10.1366/0003702934334561 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA MC317 UT WOS:A1993MC31700009 ER PT J AU HAALAND, DM THOMAS, EV BLAIR, DS AF HAALAND, DM THOMAS, EV BLAIR, DS TI IMPROVEMENTS IN METHODS FOR SPECTRAL COMBINATION OF GAS-CHROMATOGRAPHY FOURIER-TRANSFORM INFRARED SPECTROSCOPIC DATA SO APPLIED SPECTROSCOPY LA English DT Article DE GC FT-IR; CLASSICAL LEAST-SQUARES; S/N IMPROVEMENT AB Coaddition of spectra in a single-component peak of a gas chromatograph (GC) obtained with a Fourier transform infrared spectrometer is the method generally used to improve the signal-to-noise ratio (S/N) of the spectrum of the eluted analyte. It is commonly thought that coaddition of spectra to a relative intensity level of 40% of the GC peak will lead to the optimal improvement in S/N of the resulting composite spectrum. We have shown that this is not generally the case for either simulated Gaussian-shaped or experimentally obtained asymmetric GC bands. The optimal intensity level for coaddition is found to be a function of the shape of the GC band and the ratio of the number of background to sample scans used in generating the individual IR spectra. We have also introduced the use of classical least-squares (CLS) techniques as a superior method to improve the S/N of the composite analyte spectrum. With the use of CLS methods, spectra included in generating the composite spectrum can be a small fraction of the maximum intensity in the GC peak while still resulting in S/N improvements. The theoretical S/N of the composite spectrum with the use of CLS methods is shown to be always as good as or better than that achieved with the coaddition method. The improvements achieved in S/N when CLS methods are used can be more than a factor of two greater than results for the traditional coaddition method for the cases considered in this paper. Furthermore, it is shown that increasing the number of background to sample scans is a very convenient method to improve the S/N of the composite spectrum obtained by either method. The results presented here for GC/FT-IR are also generally applicable to LC/FT-IR, SFC/FT-IR, and TGA/FT-IR for bands that contain a single analyte. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 0003-7028 EI 1943-3530 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1993 VL 47 IS 10 BP 1612 EP 1619 DI 10.1366/0003702934334660 PG 8 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA MC317 UT WOS:A1993MC31700015 ER PT J AU VO-DINH, T STOKES, DL AF VO-DINH, T STOKES, DL TI SURFACE-ENHANCED RAMAN VAPOR DOSIMETER SO APPLIED SPECTROSCOPY LA English DT Article DE RAMAN SPECTROSCOPY; SURFACE-ENHANCED RAMAN SCATTERING; DOSIMETER; VAPOR MONITOR; BENZOIC ACID ID FLOW-INJECTION ANALYSIS; SILVER ELECTRODE; SCATTERING ANALYSIS; SPECTROSCOPY; SUBSTRATE; MONITORS; PYRIDINE; SPECTRA AB This paper describes a new direct-reading personal dosimeter designed to detect vapors of organic chemicals. The device employs the surface-enhanced Raman scattering (SERS) technique for direct measurement of the amount of analyte collected on the dosimeter, requiring no sample desorption or wet-chemical extraction procedure. The time-weighted average exposure to the chemical vapors can be determined on the dosimeter substrate. The results with benzoic acid used as the model compound illustrate the usefulness of this SERS-based dosimeter. RP OAK RIDGE NATL LAB, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 19 TC 16 Z9 16 U1 1 U2 6 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 0003-7028 EI 1943-3530 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1993 VL 47 IS 10 BP 1728 EP 1732 DI 10.1366/0003702934334679 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA MC317 UT WOS:A1993MC31700035 ER PT J AU DOU, SX LIU, HK GUO, YC JIN, XJ HU, QY SHI, DL SALEMSUGUI, S WANG, Z AF DOU, SX LIU, HK GUO, YC JIN, XJ HU, QY SHI, DL SALEMSUGUI, S WANG, Z TI CRITICAL-CURRENT DENSITY AND IRREVERSIBILITY BEHAVIOR IN AG-SHEATHED BI-BASED SUPERCONDUCTING WIRES FABRICATED USING A CONTROLLED MELT PROCEDURE SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT WORLD CONGRESS ON SUPERCONDUCTIVITY CY SEP 15-18, 1992 CL MUNICH, GERMANY ID MAGNETIC-RELAXATION; SINGLE-CRYSTALS; FLUX CREEP; TAPES AB A phase formation-decomposition-recovery(PFDR) has been developed for fabrication of Ag/(Bi,Pb)2Sr2Ca2Cu3Oy(2223) wires which exhibit a significant enhancement of the J(c). The irreversibility lines were determined using both AC susceptibility measurements under DC fields and magnetisation measurements. It was found that flux pinning was enhanced in the PFDR processed samples over the normal processed samples, in particular at temperatures above 77 K. The PFDR process results in high mass density, grain alignment, uniform distribution of impurity precipitates and high density of defects. The irreversibility temperatures scaled with the applied field according to the H-1/3, which is in contrast to H-2/3 law for YBa2Cu3O7-x and conventional superconductors. The irreversibility lines for PFDR processed tapes showed a crossover with those for normal processed tapes at temperatures below T(c) of the (Bi,Pb)2Sr2CaCu2O8+x (2212) phase, suggesting that at temperatures above T(c) of the 2212 phase, the 2212 as nonsuperconducting region, may serve as effective pinning sites for fluxoids. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DOU, SX (reprint author), UNIV NEW S WALES,SCH MAT SCI & ENGN,POB 1,KENSINGTON,NSW 2033,AUSTRALIA. RI Dou, Shi Xue/D-5179-2012; Liu, Hua/G-1349-2012 OI Dou, Shi Xue/0000-0003-3824-7693; Liu, Hua/0000-0002-0253-647X NR 19 TC 14 Z9 14 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD OCT-DEC PY 1993 VL 1 IS 10-12 BP 1515 EP 1522 DI 10.1016/0964-1807(93)90301-H PG 8 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LR723 UT WOS:A1993LR72300005 ER PT J AU CARTER, WL RILEY, GN LUO, JS MERCHANT, N MARONI, VA AF CARTER, WL RILEY, GN LUO, JS MERCHANT, N MARONI, VA TI STABILITY AND GROWTH OF THE (BI,PB)2SR2CA2CU3OX PHASE IN A SILVER SHEATH SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT WORLD CONGRESS ON SUPERCONDUCTIVITY CY SEP 15-18, 1992 CL MUNICH, GERMANY AB The chemical stability and growth kinetics of the (Bi,Pb)2Sr2Ca2Cu3Ox (2223) phase have been investigated as a function of temperature and composition using x-ray diffraction, scanning electron microscopy and wavelength dispersive x-ray spectroscopy. Silver tubes were filled with precursor 2223 powders and processed into tapes using conventional deformation techniques. The tapes were processed at temperatures ranging from 810 to 830-degrees-C for times ranging from 10 to 12,000 minutes in an oxygen partial pressure of 0.075 atm. The 2223 phase shows limited non-stoichiometry of Cu, (Ca+Sr), and (Bi+Pb), but relatively broad solid solubility within the alkaline earths and heavy metals. The kinetics of transformation from Bi2Sr2Ca1Cu2Ox to the 2223 phase appear to be controlled by a two-dimensional diffusion process. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP CARTER, WL (reprint author), AMER SUPERCONDUCTOR CORP,WATERTOWN,MA 02172, USA. NR 17 TC 19 Z9 19 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD OCT-DEC PY 1993 VL 1 IS 10-12 BP 1523 EP 1534 DI 10.1016/0964-1807(93)90302-I PG 12 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LR723 UT WOS:A1993LR72300006 ER PT J AU XU, M POLONKA, J GOLDMAN, AI FINNEMORE, DK MCKERNAN, S AF XU, M POLONKA, J GOLDMAN, AI FINNEMORE, DK MCKERNAN, S TI GROWTH OF PRECIPITATES IN BI2SR2CA1CU2O8 SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT WORLD CONGRESS ON SUPERCONDUCTIVITY CY SEP 15-18, 1992 CL MUNICH, GERMANY AB In the formation of Bi2Sr2Ca1Cu2O8 from a Ca and Cu rich melt, the partial pressure of oxygen is a central factor controlling the phases that form as precipitates in the host superconductor. At a high oxygen pressure, a sample with a stoichiometry of Bi2Sr2Ca2Cu3O10 will form (Sr,Ca)2Cu1O3 as the dominant precipitate coexisting with the liquid from which Bi2Sr2Ca1Cu2O8 forms. During the crystallization of Bi2Sr2Ca1Cu2O8 from this liquid, part of the (Sr,Ca)2Cu1O3 phase is consumed. By contrast, at low oxygen partial pressure a sample with the same stoichiometry will form CaO as the dominant precipitate co-existing with the liquid from which Bi2Sr2Ca1Cu2O8 forms. In this case, some of the CaO is consumed and a Ca rich (Sr,Ca)2Cu1O3 phase forms during the Bi2Sr2Ca1Cu2O8 crystallization. Oxygen partial pressure is a key factor controlling the sequence of precipitates tha.t form in the host superconductor. C1 UNIV MINNESOTA,CTR HIGH RESOLUT MICROSCOPY,MINNEAPOLIS,MN 55455. RP XU, M (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD OCT-DEC PY 1993 VL 1 IS 10-12 BP 1547 EP 1554 DI 10.1016/0964-1807(93)90304-K PG 8 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LR723 UT WOS:A1993LR72300008 ER PT J AU CRANE, P STIAVELLI, M KING, IR DEHARVENG, JM ALBRECHT, R BARBIERI, C BLADES, JC BOKSENBERG, A DISNEY, MJ JAKOBSEN, P KAMPERMAN, TM MACHETTO, F MACKAY, CD PARESCE, F WEIGELT, G BAXTER, D GREENFIELD, P JEDRZEJEWSKI, R NOTA, A SPARKS, WB AF CRANE, P STIAVELLI, M KING, IR DEHARVENG, JM ALBRECHT, R BARBIERI, C BLADES, JC BOKSENBERG, A DISNEY, MJ JAKOBSEN, P KAMPERMAN, TM MACHETTO, F MACKAY, CD PARESCE, F WEIGELT, G BAXTER, D GREENFIELD, P JEDRZEJEWSKI, R NOTA, A SPARKS, WB TI HIGH-RESOLUTION IMAGING OF GALAXY CORES SO ASTRONOMICAL JOURNAL LA English DT Article ID PLANETARY CAMERA OBSERVATIONS; ELLIPTICAL GALAXIES; SURFACE PHOTOMETRY; BLACK-HOLES; BRIGHTNESS PROFILES; SUPERMASSIVE OBJECT; SPIRAL GALAXIES; M31; NUCLEUS; EVOLUTION AB Surface photometry data obtained with the Faint Object Camera of the Hubble Space Telescope in the cores of ten galaxies is presented. The major results are: (i) none of the galaxies show truly ''isothermal'' cores, (ii) galaxies with nuclear activity show very similar light profiles, (iii) all objects show central mass densities > 10(3) M . pc-3, (iv) four of the galaxies (M87, NGC 3862, NGC 4594, NGC 6251) show evidence for exceptional nuclear mass concentrations. C1 LAWRENCE BERKELEY LAB,DEPT ASTRON,BERKELEY,CA 94720. CNRS,ASTRON SPATIALE LAB,F-13012 MARSEILLE,FRANCE. OSSERV ASTRON PADOVA,I-35122 PADUA,ITALY. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. ROYAL GREENWICH OBSERV,CAMBRIDGE CB3 0EZ,ENGLAND. UNIV WALES COLL CARDIFF,DEPT PHYS,CARDIFF CF1 3TH,WALES. ESTEC,ESA,DEPT SPACE SCI,DIV ASTROPHYS,2210 AG NOORDWIJK,NETHERLANDS. UTRECHT SPACE RES INST,SPACE RES LAB,3527 MS UTRECHT,NETHERLANDS. INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND. MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP CRANE, P (reprint author), EUROPEAN SO OBSERV,KARL SCHWARZSCHILD STR 2,W-8046 GARCHING,GERMANY. NR 62 TC 160 Z9 161 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1993 VL 106 IS 4 BP 1371 EP 1393 DI 10.1086/116733 PG 23 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LZ183 UT WOS:A1993LZ18300010 ER PT J AU CHARLOT, S FALL, SM AF CHARLOT, S FALL, SM TI LYMAN-ALPHA EMISSION FROM GALAXIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; GALAXIES, EVOLUTION; GALAXIES, ISM; GALAXIES, STELLAR CONTENT; ULTRAVIOLET, GALAXIES ID STAR-FORMING GALAXIES; PRIMEVAL GALAXIES; HIGH-REDSHIFT; OBSERVATIONAL TESTS; ENERGY-DISTRIBUTION; ABSORPTION SYSTEMS; METAL ENRICHMENT; DUST; ABSORBER; EVOLUTION AB We use new models of stellar population synthesis to compute the Lyalpha emission from galaxies with different star formation histories and initial mass functions. The models include all phases of stellar evolution and recent advances in the theories of stellar interiors and atmospheres. We find that dust-free galaxies would have Lyalpha equivalent widths of 50-200 angstrom, i.e., significantly higher than previous estimates, except from a few times 10(7) to 10(9) yr after a burst of star formation. We also consider several other factors that can affect the observed Lyalpha emission: the contributions by supernova remnants and active galactic nuclei, the orientation of a galaxy, and absorption by dust. We then use this framework to interpret the observations of and searches for Lyalpha emission from nearby star-forming galaxies, damped Lyalpha systems, blank sky, and the companions of quasars and damped Lyalpha systems. We suggest that, when Lyalpha emission is weak or absent, as is the case in most star-forming galaxies at low redshifts and in damped Lyalpha systems at high redshifts, the observed abundance of dust is sufficient to absorb most of the Lyalpha photons. On the other hand, when Lyalpha emission is strong, the presence of highly ionized species such as C IV and He II, large velocity widths, or nearby quasars indicate that much of the ionizing radiation may be supplied by active galactic nuclei. The null results of the many searches for Lyalpha emission from primeval galaxies are probably a consequence of the relatively brief periods in which galaxies are nearly dust-free and hence Lyalpha-bright. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP CHARLOT, S (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. NR 82 TC 251 Z9 251 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 OCT 1 PY 1993 VL 415 IS 2 BP 580 EP 588 DI 10.1086/173187 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LY327 UT WOS:A1993LY32700013 ER PT J AU WOODEN, DH RANK, DM BREGMAN, JD WITTEBORN, FC TIELENS, AGGM COHEN, M PINTO, PA AXELROD, TS AF WOODEN, DH RANK, DM BREGMAN, JD WITTEBORN, FC TIELENS, AGGM COHEN, M PINTO, PA AXELROD, TS TI AIRBORNE SPECTROPHOTOMETRY OF SN-1987A FROM 1.7 TO 12.6 MICRONS - TIME HISTORY OF THE DUST CONTINUUM AND LINE EMISSION SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Review DE DUST, EXTINCTION; INFRARED, STARS; SUPERNOVAE, INDIVIDUAL (SN-1987A) ID SPECTRAL IRRADIANCE CALIBRATION; BOLOMETRIC LIGHT-CURVE; LARGE MAGELLANIC CLOUD; SUPERNOVA 1987A; SN 1987A; INFRARED SPECTROPHOTOMETRY; PHOTOMETRIC-OBSERVATIONS; ABSOLUTE FLUXES; HYDROGENIC IONS; CARBON-MONOXIDE AB Spectrophotometric observations (1.7-12.6 mum) of SN 1987A from the Kuiper Airborne Observatory are presented for five epochs at 60, 260, 415, 615, and 775 days after the explosion. A variety of emission lines is seen, including members of the hydrogen Humphreys, Pfund, Brackett, and Paschen series, fine-structure lines of metals (including [Ni II] 6.634 mum, [Ni I] 7.507 mum, [Ar II] 6.985 mum, and [Co II] 10.521 mum), and CO and SiO molecular bands. The temporal evolution of the seven strongest H lines follows case C recombination theory and yields large values Of tau(Halpha) at 260 and 415 days. A mass of approximately 2 x 10(-3) M. is derived for stable nickel, and the ratio of the [Ni I] 7.507 mum and [Ni II] 6.634 mum line intensities yields a high ionization fraction of 0.9 in the nickel zone. Dust condensation is clearly detected at 615 days for the first time in a Type II supernova. At no time is there a 9.7 mum emission feature characteristic of interstellar astronomical silicates in the spectra of SN 1987A, nor are the 6.2 or 7.7 mum emission features attributed to polycyclic aromatic hydrocarbons seen. These airbome data are combined with other airbome and ground-based measurements taken at (or near) the same time to form five composite spectra of SN 1987A with wavelength coverage from approximately 3200 angstrom to 100 mum. The IR continuum emission between approximately 2 and 100 mum is compared with a three-component model-(1) hot photospheric continuum, (2) free-free and free-bound H emission, and (3) dust continuum-with the best fit determined using a nonlinear chi2 method. The dust continuum component is well characterized by a single-temperature graybody emission spectrum, i.e., by the radiation from gray grains or dust in optically thick clumps. At early times (less than 400 days after core collapse), the dust emission tracks the bolometric luminosity at about the 2% level. By 615 days, the fraction of the total luminosity contributed by the IR dust continuum increases dramatically to 0.45, and then to 0.83 at 775 days. We suggest that this dichotomy in the temporal evolution of the dust emission arises from dust with different origins. Circumstellar dust present before the supernova and then heated by it may account for the early emission. Newly condensed dust in the ejecta accounts for the later emission. A lower limit to the dust mass at 775 days is approximately 10(-4) M., but much more dust could be present. Since the emission is well fitted by a graybody, no information on the dust composition can be directly discerned from our data. C1 UNIV CALIF SANTA CRUZ OBSERV,LICK OBSERV,SANTA CRUZ,CA 95064. UNIV CALIF BERKELEY,RADIO ASTRON LAB,BERKELEY,CA 94720. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP WOODEN, DH (reprint author), NASA,AMES RES CTR,MAIL STOP 245-6,MOFFETT FIELD,CA 94035, USA. NR 109 TC 153 Z9 154 U1 0 U2 8 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD OCT PY 1993 VL 88 IS 2 BP 477 EP 507 DI 10.1086/191830 PG 31 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LY026 UT WOS:A1993LY02600006 ER PT J AU SPENCE, JW LIPFERT, FW KATZ, S AF SPENCE, JW LIPFERT, FW KATZ, S TI THE EFFECT OF SPECIMEN SIZE, SHAPE, AND ORIENTATION ON DRY DEPOSITION TO GALVANIZED STEEL SURFACES SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE DRY DEPOSITION; RUN-OFF CHEMISTRY; GALVANIZED STEEL; SO2; HNO3; HCL; CORROSION; SURFACE BOUNDARY LAYER ID CORROSION; IMPACT; NOX AB Galvanized steel specimens varying in size, shape, orientation angle and previous exposure history (weathered specimens) were exposed at Research Triangle Park, NC, in the absence of natural precipitation. The soluble corrosion products were assumed to represent the effects of dry deposition of airborne substances. The statistical analysis of their variability in relation to atmospheric conditions suggested that these substances included sulfur dioxide, nitric acid, hydrochloric acid, and calcium (presumably from coarse particles). The specimen characteristic most influencing inferred dry deposition was previous exposure history. Deposition of gases depended on surface condition (wetness), wind speed, temperature, and to a lesser extent, orientation angle. Deposition of particles depended on orientation angle. Loss of soluble zinc from specimens varied with specimen size to the -0.2 power, even though Reynolds numbers based on average wind speeds and specimen length were well below those classically expected to produce turbulent flow. C1 ENVIRONM CONSULTANT,NORTHPORT,NY. SUNY BUFFALO,BUFFALO,NY 14260. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP SPENCE, JW (reprint author), US EPA,RES TRIANGLE PK,NC 27711, USA. NR 18 TC 3 Z9 4 U1 1 U2 2 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 OCT PY 1993 VL 27 IS 15 BP 2327 EP 2336 DI 10.1016/0960-1686(93)90401-J PG 10 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA MG296 UT WOS:A1993MG29600006 ER PT J AU ROBINSON, NJ TOMMEY, AM KUSKE, C JACKSON, PJ AF ROBINSON, NJ TOMMEY, AM KUSKE, C JACKSON, PJ TI PLANT METALLOTHIONEINS SO BIOCHEMICAL JOURNAL LA English DT Review ID CADMIUM-BINDING PEPTIDES; NEUROSPORA-CRASSA METALLOTHIONEIN; GERM-EC-PROTEIN; ESCHERICHIA-COLI; SCHIZOSACCHAROMYCES-POMBE; SACCHAROMYCES-CEREVISIAE; DATURA-INNOXIA; FISSION YEAST; DNA-BINDING; PROKARYOTIC METALLOTHIONEIN C1 LOS ALAMOS NATL LAB,GENOM & STRUCT BIOL GRP,LOS ALAMOS,NM 87545. RP ROBINSON, NJ (reprint author), UNIV DURHAM,DEPT BIOL SCI,DURHAM DH1 3LE,ENGLAND. RI Robinson, Nigel/J-6363-2012 OI Robinson, Nigel/0000-0001-5586-1092 NR 112 TC 301 Z9 336 U1 1 U2 14 PU PORTLAND PRESS PI LONDON PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ SN 0264-6021 J9 BIOCHEM J JI Biochem. J. PD OCT 1 PY 1993 VL 295 BP 1 EP 10 PN 1 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MA996 UT WOS:A1993MA99600001 PM 8216201 ER PT J AU FALKOWSKI, PG DUBINSKY, Z MUSCATINE, L MCCLOSKEY, L AF FALKOWSKI, PG DUBINSKY, Z MUSCATINE, L MCCLOSKEY, L TI POPULATION-CONTROL IN SYMBIOTIC CORALS SO BIOSCIENCE LA English DT Article ID EXTERNAL NUTRIENT RESOURCES; STYLOPHORA-PISTILLATA; REEF CORALS; INVERTEBRATE SYMBIOSES; NATURAL-POPULATIONS; NITROGEN LIMITATION; ZOOXANTHELLAE; AMMONIUM; MICROADRIATICUM; ASSIMILATION C1 WALLA WALLA COLL,DEPT BIOL SCI,COLL PL,WA 99324. BAR ILAN UNIV,DEPT LIFE SCI,IL-52100 RAMAT GAN,ISRAEL. UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024. RP FALKOWSKI, PG (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. NR 32 TC 208 Z9 210 U1 3 U2 44 PU AMER INST BIOLOGICAL SCI PI WASHINGTON PA 1444 EYE ST, NW, STE 200, WASHINGTON, DC 20005 SN 0006-3568 J9 BIOSCIENCE JI Bioscience PD OCT PY 1993 VL 43 IS 9 BP 606 EP 611 DI 10.2307/1312147 PG 6 WC Biology SC Life Sciences & Biomedicine - Other Topics GA LY642 UT WOS:A1993LY64200011 ER PT J AU KONG, SH JOHNSTONE, DL YONGE, DR PETERSEN, JN BROUNS, TM AF KONG, SH JOHNSTONE, DL YONGE, DR PETERSEN, JN BROUNS, TM TI REMOBILIZATION OF CHROMIUM FROM STARVED AND FRESH SUBSURFACE BACTERIAL CONSORTIUM SO BIOTECHNOLOGY LETTERS LA English DT Article AB Remobilization of chromium was studied using three types of cells in different physiological states. Cell age was not a factor in chromium remobilization processes. Both fresh and 50 day starved cells showed a similar pattern (rate) of chromium remobilization. Cells exposed to chromium for 50 days (to simulate groundwater conditions) released the most chromium during a 32 day remobilization period. C1 WASHINGTON STATE UNIV, DEPT CHEM ENGN, PULLMAN, WA 99164 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP KONG, SH (reprint author), WASHINGTON STATE UNIV, DEPT CIVIL & ENVIRONM ENGN, PULLMAN, WA 99164 USA. RI Petersen, James/B-8924-2008 NR 5 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0141-5492 EI 1573-6776 J9 BIOTECHNOL LETT JI Biotechnol. Lett. PD OCT PY 1993 VL 15 IS 10 BP 1081 EP 1084 DI 10.1007/BF00129942 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA MF264 UT WOS:A1993MF26400020 ER PT J AU GERGS, U HAGEMANN, K ZEEVAART, JAD WEILER, EW AF GERGS, U HAGEMANN, K ZEEVAART, JAD WEILER, EW TI THE DETERMINATION OF PHASEIC ACID BY MONOCLONAL ANTIBODY-BASED ENZYME-IMMUNOASSAY SO BOTANICA ACTA LA English DT Article DE PHASEOLUS VULGARIS; ABSCISIC ACID; ENZYME IMMUNOASSAY (PHASEIC ACID); MONOCLONAL ANTIBODY (PHASEIC ACID); PHASEIC ACID ID ABSCISIC-ACID; DIHYDROPHASEIC ACID; PHASEOLUS-VULGARIS; WATER-STRESS; METABOLISM; LEAVES AB A monoclonal antibody PA3-2-B3, IgG(1) (lambda) is described which specifically recognizes phaseic acid and shows very little cross-reactivity (0.14 %) with abscisic acid or dihydrophaseic acid (0.88 %). Based on this antibody, an enzyme immunoassay was developed which displays a linearity range from 15 pg to 3 ng of phaseic acid. Results obtained with this assay agree with those obtained by gas chromatography-electron capture detection. Using the novel enzyme immunoassay, as well as an established immunoassay for abscisic acid, levels of these two compounds in leaves of Phaseolus vulgaris were determined as a function of plant age, water stress, recovery from stress, and feeding of abscisic acid through the transpiration stream. The production of phaseic acid in a microsomal system from bean leaves was demonstrated. The results show a regulation of the plant's capacity to metabolize abscisic acid to phaseic acid as a function of water stress. C1 RUHR UNIV BOCHUM,LEHRSTUHL PFLANZENPHYSIOL,D-44780 BOCHUM,GERMANY. MICHIGAN STATE UNIV,MSU DOE,PLANT RES LAB,E LANSING,MI. NR 21 TC 11 Z9 11 U1 0 U2 1 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0932-8629 J9 BOT ACTA JI Bot. Acta PD OCT PY 1993 VL 106 IS 5 BP 404 EP 410 PG 7 WC Plant Sciences SC Plant Sciences GA MM812 UT WOS:A1993MM81200006 ER PT J AU ANDERSON, KK NICHOLSON, WL AF ANDERSON, KK NICHOLSON, WL TI A RELATIVE MAGNITUDE MODEL FOR MEASUREMENTS OF SOVIET UNDERGROUND NUCLEAR-EXPLOSIONS FROM REGIONAL STATIONS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article AB Recent research has shown the stability of root-mean-square Lg measurements for the accurate estimation of yields of Soviet underground nuclear explosions. Hansen, Ringdal, and Richards (1990) presented log-rms Lg data for 16 well-recorded Soviet underground nuclear explosions from eight seismic stations in Norway, the USSR, and China and a worldwide m(b) measurement for the same events. These data were analyzed using a relative magnitude model in which the parameters represent relative or normalized versions of the station intercepts, slopes and log-yields from the usual seismic magnitude/yield relationship. These normalized parameters are estimable without yield data and are simple transformations of the actual station intercepts, station slopes, and log-yields. Relative magnitude modeling permits comparisons of the seismic magnitude/yield relationships of the individual stations and the worldwide m(b) measurements without yield data. The slope at the China Digital Seismograph Network station Hallar was found to be significantly different from that of the other stations in the study. The residual analysis estimated the precision of the log-rms Lg measurements of well-recorded explosions to be 0.0279 in magnitude units, which is in agreement with the findings of Hansen, Ringdal, and Richards (1990). RP ANDERSON, KK (reprint author), PACIFIC NW LAB, MSIN K7-34, POB 999, RICHLAND, WA 99352 USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD OCT PY 1993 VL 83 IS 5 BP 1563 EP 1573 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LY944 UT WOS:A1993LY94400013 ER PT J AU MEFFE, GK SNELSON, FF AF MEFFE, GK SNELSON, FF TI LIPID DYNAMICS DURING REPRODUCTION IN 2 LIVEBEARING FISHES, GAMBUSIA-HOLBROOKI AND POECILIA-LATIPINNA SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID OFFSPRING SIZE; MOSQUITOFISH AB In animals, strategies of energy allocation among growth, maintenance and reproduction can be significantly altered by lipid storage. Poeciliid (livebearing) fishes store energy in late summer and fall for overwintering and first reproduction in spring, but derails of energy use in reproduction are lacking. We conducted a laboratory experiment on the eastern mosquitofish (Gambusia holbrooki) and the sailfin molly (Poecilia latipinna) to document changes in lipid content in both the ovary and soma during development of a brood. In females of both species, ovarian lipid content was highest early in embryogeny and then declined; adult somatic lipids increased (were replenished) during embryonic development in mosquitofish, but declined in mollies. Larger clutches sequestered a larger share of body lipids in both species, possibly indicating energetic limits to reproduction. Finally, growth rate was positively correlated with somatic lipid content in both species, indicating among-individual differences in metabolic efficiency or feeding efficiency rather than a trade-off between growth and energy storage. C1 UNIV CENT FLORIDA,DEPT BIOL,ORLANDO,FL 32816. RP MEFFE, GK (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 18 TC 22 Z9 22 U1 1 U2 6 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 OCT PY 1993 VL 50 IS 10 BP 2185 EP 2191 DI 10.1139/f93-245 PG 7 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA MU352 UT WOS:A1993MU35200017 ER PT J AU SEED, TM MEYERS, SM AF SEED, TM MEYERS, SM TI CHRONIC RADIATION-INDUCED ALTERATION IN HEMATOPOIETIC REPAIR DURING PRECLINICAL PHASES OF APLASTIC-ANEMIA AND MYELOPROLIFERATIVE DISEASE - ASSESSING UNSCHEDULED DNA-SYNTHESIS RESPONSES SO CANCER RESEARCH LA English DT Article ID IONIZING-RADIATION; GAMMA-IRRADIATION; DAMAGING AGENTS; LEUKEMIA; CELL; LYMPHOCYTES; BETA; LEUKEMOGENESIS; PROGENITORS; POLYMERASES AB Protracted, low-daily-dose gamma-ray exposure (3.8-7.5 cGy/day) segregates canines into separate survival- and pathology-based subgroups by the early elicitation of distinct, repair-mediated hemopathological response pathways. In this study, we verified the blood and marrow responses of two major subgroups prone to either aplastic anemia or myeloproliferative disease, along with two variants, and extended our analyses of hematopoietic repair to include studies of DNA repair in bone marrow blasts using an autoradiographically based unscheduled DNA synthesis (UDS) assay. The myeloproliferative disease-prone subgroup exhibited extended survival (>200 days), related to partial, gradual restoration of blood leukocyte, platelet, and marrow progenitor levels following an initial phase of acute suppression. Marrow blasts taken during the restoration phase showed expanded and qualitatively modified UDS relative to marrow blasts of age-matched control animals. The amount of UDS per blast (signal strength) increased significantly, as did the number of UDS-positive cells and their sensitivities to high-dose UV induction and 1-beta-D-arabinofuranosylcytosine chemical inhibition. A nonevolving myeloproliferative disease-prone variant having prolonged survival (>200 days) and restored blood cells and marrow progenitor levels also had marrow blasts with expanded UDS responses, but these were uniquely evoked by low (but not high) doses of UV inducer. The aplastic anemia-prone subgroup was characterized by short survival (<200 days), progressive decline (without restoration) in all measured blood and marrow compartments, and largely nonsignificant changes in UDS responses of marrow blasts. A variant of this aplastic anemia-prone subgroup (with comparable short survival due to markedly ineffective hematopoiesis, but expressing select preleukemic features) exhibited reduced numbers (relative to age-matched controls) of highly responsive, UDS-positive marrow blasts (in terms of UDS signal strength and increased sensitivity to 1-beta-D-arabinofuranosylcytosine-induced UDS inhibition). From these observations we conclude that: (a) the UDS response of marrow blasts, a correlate of hematopoietic progenitorial repair, is altered differentially within selected subgroups of animals under chronic radiation exposure; and (b) the nature of altered UDS repair response patterns appears to be largely related to the preclinical status/predisposition of the individual animal and thus may provide prognostically useful information in the clinical monitoring of chronically irradiated individuals with minimal but evolving hematological disease. RP SEED, TM (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,RADIAT HEMATOL GRP,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 42 TC 9 Z9 10 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD OCT 1 PY 1993 VL 53 IS 19 BP 4518 EP 4527 PG 10 WC Oncology SC Oncology GA LZ637 UT WOS:A1993LZ63700017 PM 8402623 ER PT J AU LEOPOLD, LB COLLINS, JN COLLINS, LM AF LEOPOLD, LB COLLINS, JN COLLINS, LM TI HYDROLOGY OF SOME TIDAL CHANNELS IN ESTUARINE MARSHLAND NEAR SAN-FRANCISCO SO CATENA LA English DT Article AB Measurements of velocity, depth, discharge, and slope were simultaneously made at ten gages along a natural estuarine channel 19,000 feet in length in Petaluma Marsh, California. Along the study reach the channel decreases from a width of 47 feet at its mouth to nearly zero at its headward extent, with accompanying decrease in depth. Though gage height varies with time in a smooth sinusoidal manner at all stations, this is not true for velocity, discharge, or slope. Velocity is rather constant for long periods in the ebb cycle and differs but little along the length of the channel. It is somewhat higher on ebb than on flood tide. At most gage sites, velocity continues one-half to one hour after the gage height has reached its maximum or minimum value and reversed. In this channel water surface slope is considerably greater in the midreach of channel than in either the mouthward or headward reaches. Slopes vary from less than .0001 to about .0005 through much of a tidal cycle. At some stages of both ebb and flood, the upper end of the channel has a positive slope while the lower end a negative or adverse slope. At those times the longitudinal profile of water surface is bow shaped or V shaped. C1 UNIV CALIF BERKELEY,DEPT GEOG,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP LEOPOLD, LB (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. NR 5 TC 43 Z9 44 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0341-8162 J9 CATENA JI Catena PD OCT PY 1993 VL 20 IS 5 BP 469 EP 493 DI 10.1016/0341-8162(93)90043-O PG 25 WC Geosciences, Multidisciplinary; Soil Science; Water Resources SC Geology; Agriculture; Water Resources GA LW810 UT WOS:A1993LW81000003 ER PT J AU OLINS, AL OLINS, DE AF OLINS, AL OLINS, DE TI STEREO-ELECTRON MICROSCOPY OF DNA-STAINED MITOTIC CHROMOSOMES FROM DICTYOSTELIUM-DISCOIDEUM SO CELL BIOLOGY INTERNATIONAL LA English DT Article RP OLINS, AL (reprint author), UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,DIV BIOL,OAK RIDGE NATL LAB,BOX 2009,OAK RIDGE,TN 37831, USA. FU NIGMS NIH HHS [GM 45725] NR 8 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 1065-6995 J9 CELL BIOL INT JI Cell Biol. Int. PD OCT PY 1993 VL 17 IS 10 BP 941 EP 944 DI 10.1006/cbir.1993.1016 PG 4 WC Cell Biology SC Cell Biology GA MG791 UT WOS:A1993MG79100004 PM 7506960 ER PT J AU Theiler, J Eubank, S AF Theiler, James Eubank, Stephen TI Don't bleach chaotic data SO CHAOS LA English DT Article DE SPECTRAL ANALYSIS; AUTOCORRELATIONS; CHAOTIC SYSTEMS; SIGNAL PROCESSING; POWER SPECTRA AB A common first step in time series signal analysis involves digitally filtering the data to remove linear correlations. The residual data is spectrally white (it is ''bleached''), but in principle retains the nonlinear structure of the original time series. It is well known that simple linear autocorrelation can give rise to spurious results in algorithms for estimating nonlinear invariants, such as fractal dimension and Lyapunov exponents. In theory, bleached data avoids these pitfalls. But in practice, bleaching obscures the underlying deterministic structure of a low-dimensional chaotic process. This appears to be a property of the chaos itself, since nonchaotic data are not similarly affected. The adverse effects of bleaching are demonstrated in a series of numerical experiments on known chaotic data. Some theoretical aspects are also discussed. C1 [Theiler, James; Eubank, Stephen] Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. [Theiler, James; Eubank, Stephen] Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. [Theiler, James; Eubank, Stephen] Santa Fe Inst, Santa Fe, NM 87501 USA. [Eubank, Stephen] Prediction Co, Santa Fe, NM 87501 USA. RP Theiler, J (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RI Eubank, Stephen/D-7497-2011 OI Eubank, Stephen/0000-0002-7177-309X FU National Institute for Mental Health [1-R01-MH47184]; U.S. Department of Energy FX We are pleased to acknowledge Bryan Galdrikian, Andre Longtin, and Doyne Farmer, who collaborated with us in developing the method of surrogate data. We are also grateful to Blake LeBaron, William Brock, Tim Sauer, and Lou Pecora for many useful discussions. This work was partially supported by the National Institute for Mental Health under Grant No. 1-R01-MH47184, and performed under the auspices of the U.S. Department of Energy. NR 57 TC 64 Z9 65 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1054-1500 J9 CHAOS JI Chaos PD OCT PY 1993 VL 3 IS 4 BP 771 EP 782 DI 10.1063/1.165936 PG 12 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA V22XU UT WOS:000208308700031 ER PT J AU WURZ, P LYKKE, KR AF WURZ, P LYKKE, KR TI PHOTODETACHMENT FROM LASER-DESORBED C-2(-) SO CHEMICAL PHYSICS LA English DT Article ID CARBON CLUSTER IONS; MASS-SPECTROMETRY; ELECTRON-EMISSION; DYE-LASER; DESORPTION; IONIZATION; GRAPHITE; ENERGIES; SURFACE; C2 AB We report on C2- desorption from graphite by pulsed laser light at 532 nm wavelength. The threshold fluence for laser desorption of C2- is 10 muJ/mm2. For the first time, rotational analysis of a laser-desorbed negative molecular ion is performed. A rotational temperature of 1500 K is obtained by using two-photon resonance-enhanced detachment via the Herzberg-Lagerqvist band of C2-. This is in good agreement with our theoretical calculations for the surface heating during laser irradiation of graphite. Thermal desorption is identified as the responsible mechanism for particle removal at the low laser fluences probed in this study. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 38 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD OCT 1 PY 1993 VL 176 IS 1 BP 185 EP 193 DI 10.1016/0301-0104(93)85016-2 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LZ716 UT WOS:A1993LZ71600014 ER PT J AU PARK, CH WELLS, BO DICARLO, J SHEN, ZX SALEM, JR BETHUNE, DS YANNONI, CS JOHNSON, RD DEVRIES, MS BOOTH, C BRIDGES, F PIANETTA, P AF PARK, CH WELLS, BO DICARLO, J SHEN, ZX SALEM, JR BETHUNE, DS YANNONI, CS JOHNSON, RD DEVRIES, MS BOOTH, C BRIDGES, F PIANETTA, P TI STRUCTURAL INFORMATION ON Y-IONS IN C82 FROM EXAFS EXPERIMENTS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SPHEROIDAL CARBON SHELLS; SOLID-STATE; MOLECULAR-DYNAMICS; C-60; FULLERENES; COMPLEXES; YTTRIUM; YC82; C60 AB EXAFS experiments on a fullerene sample containing both YC82 and Y2C82 are reported, performed both at 10 K and at room temperature, to probe the structural environment of the yttrium atoms. The results are similar at both temperatures. The data can be fit with a model with two shells of 6 carbon atoms each, at 2.4 and 2.9 angstrom, respectively. This result supports the hypothesis that the metal atoms are trapped inside the fullerene cage, consistent with recent calculations on possible metallofullerene structures. C1 STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064. RP PARK, CH (reprint author), STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305, USA. RI Booth, Corwin/A-7877-2008 NR 29 TC 56 Z9 57 U1 3 U2 7 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 OCT 1 PY 1993 VL 213 IS 1-2 BP 196 EP 201 DI 10.1016/0009-2614(93)85440-Y PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LZ692 UT WOS:A1993LZ69200032 ER PT J AU BARTRAM, ME MICHALSKE, TA ROGERS, JW PAINE, RT AF BARTRAM, ME MICHALSKE, TA ROGERS, JW PAINE, RT TI NUCLEATION AND GROWTH OF AIN - SELF-LIMITING REACTIONS AND THE REGENERATION OF ACTIVE-SITES USING SEQUENTIAL EXPOSURES OF TRIMETHYLALUMINUM AND AMMONIA ON SILICA AT 600 K SO CHEMISTRY OF MATERIALS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; NITRIDE THIN-FILMS; ALUMINUM NITRIDE; DEHYDROXYLATED SILICA; OXIDE SURFACES; CHEMISORPTION; PRECURSORS; ALN; ADSORPTION; MECHANISM AB The sequential reactions of trimethylaluminum (TMA) and ammonia have been studied in the 1-Torr pressure regime at 600 K with FTIR (Fourier transform infrared spectroscopy) and XPS (X-ray photoelectron spectroscopy). Transmission FTIR spectra acquired through a silica substrate reveal that extended ammonia exposure can overcome the desorption of ammonia from the methylaluminum:ammonia surface adduct identified previously. This increases the number of reactions between methyl groups and ammonia on adjacent adducts and thereby maximizes the population of bridging amino groups on the surface (Al-NH2-Al). The resulting NH2 species can then react with TMA from an additional exposure to produce a new layer of methylaluminum species. Repetitions of these sequential reactions demonstrate that the respective TMA and ammonia reactions are self-limiting, regenerating active sites suitable for promoting chemisorption of the next precursor for the layer-by-layer growth of aluminum nitride. These studies suggest that in addition to providing transport for the source elements, functional groups that remain chemisorbed on the surface may also be used to enhance the uptake of the next precursor and influence bond directionality during film growth at low temperatures. Although the crystallinity of the aluminum nitride film is expected to be limited by the amorphous nature of the silica substrate, the results from a simple conformational analysis suggest a general rule that can be applied to any substrate; if a concerted reaction between dissimilar functional groups is the only mechanism available for growth, then this mechanism will ultimately limit long-range order in the resulting film. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. RP BARTRAM, ME (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 35 TC 19 Z9 19 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD OCT PY 1993 VL 5 IS 10 BP 1424 EP 1430 DI 10.1021/cm00034a010 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MC690 UT WOS:A1993MC69000010 ER PT J AU STODOLSKY, F SANTINI, DJ AF STODOLSKY, F SANTINI, DJ TI FUELING UP WITH NATURAL-GAS SO CHEMTECH LA English DT Article RP STODOLSKY, F (reprint author), ARGONNE NATL LAB,CTR TRANSPORTATION,ENVIRONM & ECON ANAL SECT,955 LENFANT PLAZA N SW,SUITE 6000,WASHINGTON,DC 20024, USA. NR 14 TC 3 Z9 3 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2703 J9 CHEMTECH JI Chemtech PD OCT PY 1993 VL 23 IS 10 BP 54 EP 59 PG 6 WC Chemistry, Applied SC Chemistry GA ME527 UT WOS:A1993ME52700015 ER PT J AU BYRNE, CD SCHWARTZ, K CHENG, JF LAWN, RM AF BYRNE, CD SCHWARTZ, K CHENG, JF LAWN, RM TI IDENTIFICATION OF A NOVEL APO(A)-LIKE GENE AND YAC MAPPING OF 6 APO(A) RELATED GENES SO CIRCULATION LA English DT Meeting Abstract C1 STANFORD UNIV,DIV CARDIOVASC MED,STANFORD,CA 94305. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 271 EP 271 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68201490 ER PT J AU ARNOLD, KS INNERARITY, TL BLANCH, PJ KRAUSS, RM AF ARNOLD, KS INNERARITY, TL BLANCH, PJ KRAUSS, RM TI LOW-DENSITY LIPOPROTEINS FROM NORMOLIPIDEMIC-E2/2 HOMOZYGOTES HAVE REDUCED BINDING-AFFINITY TO LDL RECEPTORS ON NORMAL HUMAN FIBROBLASTS SO CIRCULATION LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,GLADSTONE INST CARDIOVASC DIS,SAN FRANCISCO,CA 94143. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 321 EP 321 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68201757 ER PT J AU MILLER, BD KRAUSS, RM CASHINHEMPHILL, L BLANKENHORN, DH AF MILLER, BD KRAUSS, RM CASHINHEMPHILL, L BLANKENHORN, DH TI BASE-LINE TRIGLYCERIDE LEVELS PREDICT ANGIOGRAPHIC BENEFIT OF COLESTIPOL PLUS NIACIN THERAPY IN THE CHOLESTEROL-LOWERING ATHEROSCLEROSIS STUDY (CLAS) SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV SO CALIF,LOS ANGELES,CA 90089. NR 0 TC 19 Z9 19 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 363 EP 363 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68201984 ER PT J AU SUPERKO, HR WILLIAMS, PT ALDERMAN, EL AF SUPERKO, HR WILLIAMS, PT ALDERMAN, EL TI DIFFERENTIAL EFFECT ON HDL OF NIACIN AND RESIN IN LDL SUBCLASS PATTERN-A AND PATTERN-B SUBJECTS SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. STANFORD UNIV,STANFORD,CA 94305. NR 0 TC 4 Z9 4 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 386 EP 386 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68202110 ER PT J AU STOLTZFUS, LJ GONG, EL NICHOLS, AV BRION, CM RUBIN, EM AF STOLTZFUS, LJ GONG, EL NICHOLS, AV BRION, CM RUBIN, EM TI APOAIMILANO AND APOAISEATTLE - DOMINANT HDL LOWERING MUTATIONS STUDIED IN TRANSGENIC MICE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 421 EP 421 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68202299 ER PT J AU CAMPOS, H DREON, DM KRAUSS, RM AF CAMPOS, H DREON, DM KRAUSS, RM TI ASSOCIATIONS OF HEPATIC AND LIPOPROTEIN-LIPASE ACTIVITIES WITH CHANGES IN DIETARY-COMPOSITION AND LIPOPROTEIN SUBCLASSES SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 456 EP 456 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68202486 ER PT J AU WILLIAMS, PT STEFANICK, ML VRANIZAN, KM WOOD, PD AF WILLIAMS, PT STEFANICK, ML VRANIZAN, KM WOOD, PD TI EFFECTS OF WEIGHT-LOSS BY EXERCISE OR BY DIETING ON HIGH-DENSITY-LIPOPROTEIN LEVELS IN MEN WITH LOW, INTERMEDIATE AND NORMAL-TO-HIGH HIGH-DENSITY LIPOPROTEIN-CHOLESTEROL AT BASE-LINE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 511 EP 511 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68202785 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 DIFFERING OXIDATIVE SUSCEPTIBILITY AND ANTIOXIDANT PROTECTION OF SURFACE AND CORE LIPIDS IN LOW-DENSITY-LIPOPROTEIN SUBFRACTIONS SO CIRCULATION LA English DT Meeting Abstract C1 CHILDRENS HOSP OAKLAND RES INST,OAKLAND,CA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 561 EP 561 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68203049 ER PT J AU REAVEN, PD TRIBBLE, D AF REAVEN, PD TRIBBLE, D TI EFFECTS OF VITAMIN-E AND OLEIC ACID-RICH DIETS ON THE SUSCEPTIBILITY OF LDL SUBFRACTIONS TO OXIDATION SO CIRCULATION LA English DT Meeting Abstract C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 564 EP 564 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68203066 ER PT J AU GLECKLER, PJ TAYLOR, KE AF GLECKLER, PJ TAYLOR, KE TI THE EFFECT OF HORIZONTAL RESOLUTION ON OCEAN SURFACE HEAT FLUXES IN THE ECMWF MODEL SO CLIMATE DYNAMICS LA English DT Article ID CLIMATE; ATMOSPHERE; TRANSPORTS; RADIATION AB Annual mean ocean surface heat fluxes have been studied as a function of horizontal resolution in the ECMWF model (cycle 33) and compared with Oberhuber's COADS (1959-1979) based empirical estimates. The model has been run at resolutions of T21, T42, T63 and T106 for 15 months with prescribed monthly varying climatological SST and sea ice. The T42 simulation was extended to 2 years, which enabled us to determine that many differences between the resolution runs were significant and could not be explained by the fact that individual realizations of an ensemble of years can be expected to give different estimates of the annual mean climate state. In addition to systematic differences between the modeled and the observed fluxes, the simulated fields of surface shortwave and longwave radiation showed much more spatial variability than the observed estimates. In the case of the longwave radiation this may be attributable more to deficiencies in the observations than to errors in the model. The modeled latent and sensible heat fields were in better agreement with observations. The primary conclusion concerning the dependence of ocean surface fluxes on resolution is that the T21 simulation differed significantly from the higher resolution runs, especially in the tropics. Although the differences among the three higher resolution simulations were generally small over most of the world ocean, there were local areas with large differences. It appears, therefore, that in relation to ocean surface heat fluxes, a resolution greater than T42 may not be justified for climate model simulations, although the locally large differences found between the higher resolution runs suggest that convergence has not been achieved everywhere even at T106. RP GLECKLER, PJ (reprint author), LAWRENCE LIVERMORE NATL LAB,PROGRAM CLIMATE MODEL DIAG & INTERCOMPARISON,LIVERMORE,CA 94550, USA. RI Taylor, Karl/F-7290-2011; Gleckler, Peter/H-4762-2012 OI Taylor, Karl/0000-0002-6491-2135; Gleckler, Peter/0000-0003-2816-6224 NR 29 TC 12 Z9 12 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0930-7575 J9 CLIM DYNAM JI Clim. Dyn. PD OCT PY 1993 VL 9 IS 1 BP 17 EP 32 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MD824 UT WOS:A1993MD82400002 ER PT J AU SCHUPP, P WATTS, P ZUMINO, B AF SCHUPP, P WATTS, P ZUMINO, B TI BICOVARIANT QUANTUM ALGEBRAS AND QUANTUM LIE-ALGEBRAS SO COMMUNICATIONS IN MATHEMATICAL PHYSICS LA English DT Article ID COMPACT MATRIX PSEUDOGROUPS; VECTOR-FIELDS; DIFFERENTIAL-CALCULUS AB A bicovariant calculus of differential operators on a quantum group is constructed in a natural way, using invariant maps from Fun (O(q)) to U(q)g, given by elements of the pure braid group. These operators - the ''reflection matrix'' Y= L+SL- being a special case - generate algebras that linearly close under adjoint actions, i.e. they form generalized Lie algebras. We establish the connection between the Hopf algebra formulation of the calculus and a formulation in compact matrix form which is quite powerful for actual computations and as applications we find the quantum determinant and an orthogonality relation for Y in SO(q)(N). C1 LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. RP SCHUPP, P (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 20 TC 47 Z9 47 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0010-3616 J9 COMMUN MATH PHYS JI Commun. Math. Phys. PD OCT PY 1993 VL 157 IS 2 BP 305 EP 329 DI 10.1007/BF02099762 PG 25 WC Physics, Mathematical SC Physics GA MC673 UT WOS:A1993MC67300005 ER PT J AU BAILEY, KC AF BAILEY, KC TI CRUISE MISSILE PROLIFERATION IN THE 1990S - CARUS,S SO COMPARATIVE STRATEGY LA English DT Book Review RP BAILEY, KC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0149-5933 J9 COMP STRATEGY PD OCT-DEC PY 1993 VL 12 IS 4 BP 477 EP 480 PG 4 WC International Relations; Political Science SC International Relations; Government & Law GA MJ082 UT WOS:A1993MJ08200009 ER PT J AU RANDRUP, J AF RANDRUP, J TI WIX - STATISTICAL NUCLEAR MULTIFRAGMENTATION WITH COLLECTIVE EXPANSION AND COULOMB FORCES SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID COLLISIONS; SIMULATION; EVENTS; MODEL AB By suitable augmentation of the event generator FREESCO, a code WIX has been constructed with which it is possible to simulate the statistical multifragmentation of a specified nuclear source, which may be both hollow and deformed, in the presence of a collective expansion and with the interfragment Coulomb forces included. C1 GESELL SCHWERIONENFORSCH MBH,W-6100 DARMSTADT 11,GERMANY. RP RANDRUP, J (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 15 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD OCT PY 1993 VL 77 IS 2 BP 153 EP 166 DI 10.1016/0010-4655(93)90001-S PG 14 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA MB226 UT WOS:A1993MB22600001 ER PT J AU ANDERSON, DM SHANKLE, SA SCOTT, MJ NEITZEL, DA CHATTERS, JC AF ANDERSON, DM SHANKLE, SA SCOTT, MJ NEITZEL, DA CHATTERS, JC TI VALUING EFFECTS OF CLIMATE-CHANGE AND FISHERY ENHANCEMENT ON CHINOOK SALMON SO CONTEMPORARY POLICY ISSUES LA English DT Article; Proceedings Paper CT 67TH ANNUAL CONF OF THE WESTERN ECONOMIC ASSOC INTERNATIONAL CY JUL 11, 1992 CL SAN FRANCISCO, CA SP W ECON ASSOC INT AB This paper represents a continuing multidisciplinary analysis of species preservation and global change. It explores the economic cost of a potential regional warming's effect on the spring chinook salmon (Oncorhynchus tshcawytscha). Climate change and planned habitat improvements impact the production and economic value of spring chinook salmon in the Yakima River tributary of the Columbia River in eastern Washington. A chinook salmon's total economic value includes the summation of the existence, commercial, recreational, and capital values. The analysis here applies currently available data on these four components of value to estimated changes in chinook salmon population resulting from regional warming. Results show that the estimated change in economic value per fish associated with reducing one fish run is significant. RP ANDERSON, DM (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Anderson, David/G-6824-2011 NR 30 TC 2 Z9 2 U1 1 U2 6 PU WESTERN ECONOMIC ASSOC INT PI HUNTINGTON BEACH PA 7400 CENTER AVE SUITE 109, HUNTINGTON BEACH, CA 92647-3039 SN 0735-0007 J9 CONTEMP POLICY ISSUE PD OCT PY 1993 VL 11 IS 4 BP 82 EP 94 PG 13 WC Economics; Public Administration SC Business & Economics; Public Administration GA MD391 UT WOS:A1993MD39100008 ER PT J AU DRESNER, L AF DRESNER, L TI REDUCING QUENCH PRESSURE BY PERFORATING THE JACKET OF A CABLE-IN-CONDUIT SUPERCONDUCTOR SO CRYOGENICS LA English DT Article DE CABLE-IN-CONDUIT SUPERCONDUCTORS; QUENCH PRESSURE; JACKET PERFORATION AB The pressure in a quenching cable-in-conduit conductor can be reduced by perforating its jacket. By adapting the method used by Miller et al. to study the peak quench pressure in unperforated conductors, we determine the pressure reduction caused by perforations as a function of their diameter and spacing. RP DRESNER, L (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 1 TC 6 Z9 6 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD OCT PY 1993 VL 33 IS 10 BP 958 EP 961 DI 10.1016/0011-2275(93)90224-C PG 4 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA LY801 UT WOS:A1993LY80100007 ER PT J AU DRESNER, L AF DRESNER, L TI ERROR SOURCE IN FLOWMETERING IN CABLE-IN-CONDUIT CONDUCTORS BY TIME-OF-FLIGHT SO CRYOGENICS LA English DT Article DE CABLE-IN-CONDUIT SUPERCONDUCTORS; FLOW RATE; TIME OF FLIGHT METHOD AB Measurement of the flow velocity of helium above the lambda point by the time of flight method suffers from inaccuracies caused by retardation of the heat pulse with respect to the flowing helium and by the progressive change in the shape of the pulse. The cause of these effects is the engulfing of cold metal by the heated slug of helium as it progresses downstream. Because the magnitude of these effects depends on the specific heat of the metal, the error in the velocity is small for low temperatures (almost-equal-to 1% in the case of NbTi/Cu at 4.0 K) but rises rapidly with increasing temperature (about a factor of 3 in the case of Ag/BSCCO at 20 K). RP DRESNER, L (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD OCT PY 1993 VL 33 IS 10 BP 962 EP 965 DI 10.1016/0011-2275(93)90225-D PG 4 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA LY801 UT WOS:A1993LY80100008 ER PT J AU SEOL, SY HULL, JR AF SEOL, SY HULL, JR TI TRANSIENT ANALYSIS AND BURNOUT OF HIGH-TEMPERATURE SUPERCONDUCTING CURRENT LEADS SO CRYOGENICS LA English DT Article DE HIGH T(C)SUPERCONDUCTORS; CURRENT LEADS; BURNOUT ID CRYOGENIC DEVICES; OPTIMIZATION; DESIGN AB The transient behaviour of high-temperature superconductor (HTS) current leads operated between liquid helium and liquid nitrogen temperatures is analysed for burnout conditions upon transition of the HTS into the normal state. Leads composed of HTS only and of HTS sheathed by pure silver or silver alloy are investigated numerically for temperature-dependent properties and analytically for temperature-independent properties. For lower values of shape factor (current density times length), the lead can be operated indefinitely without burnout. At higher values of shape factor, the lead reaches burnout in a finite time. With high current densities, the leads heat adiabatically. For a fixed shape factor, low current densities are desired to achieve long burnout times. To achieve a low helium boil-off rate in the superconducting state without danger of burnout, there is a preferred temperature dependence for thermal conductivity, and silver alloy sheaths are preferred to pure silver sheaths. However, for a given current density, pure silver sheaths take longer to burn out. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. NR 17 TC 16 Z9 16 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD OCT PY 1993 VL 33 IS 10 BP 966 EP 975 DI 10.1016/0011-2275(93)90226-E PG 10 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA LY801 UT WOS:A1993LY80100009 ER PT J AU GEORGE, GN AF GEORGE, GN TI X-RAY-ABSORPTION SPECTROSCOPY OF LIGHT-ELEMENTS IN BIOLOGICAL-SYSTEMS SO CURRENT OPINION IN STRUCTURAL BIOLOGY LA English DT Article ID L-EDGE SPECTROSCOPY; SULFUR-K AB Soft X-ray absorption spectroscopy of light elements has, until recently, fallen almost exclusively within the purview of materials science. Recent developments in techniques now allow access to this spectral range by biological scientists. This review discusses some of the recent work on X-ray absorption spectroscopy of light elements in biological systems and discusses some of the possibilities for future work. RP GEORGE, GN (reprint author), STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94305, USA. RI George, Graham/E-3290-2013 NR 22 TC 14 Z9 14 U1 2 U2 4 PU CURRENT BIOLOGY LTD PI LONDON PA 34-42 CLEVELAND STREET, LONDON, ENGLAND W1P 6LB SN 0959-440X J9 CURR OPIN STRUC BIOL JI Curr. Opin. Struct. Biol. PD OCT PY 1993 VL 3 IS 5 BP 780 EP 784 DI 10.1016/0959-440X(93)90064-R PG 5 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MB536 UT WOS:A1993MB53600018 ER PT J AU ELLINGEN, DC AF ELLINGEN, DC TI INMAGIC PLUS-PLUS IMAGES SO DATABASE LA English DT Article RP ELLINGEN, DC (reprint author), LAWRENCE LIVERMORE NATL LAB,7000 E AVE,POB 808,MAIL STOP,L542,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ONLINE INC PI WILTON PA 462 DANBURY RD, WILTON, CT 06897-2126 SN 0162-4105 J9 DATABASE JI Database PD OCT PY 1993 VL 16 IS 5 BP 56 EP 59 PG 4 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA LY538 UT WOS:A1993LY53800009 ER PT J AU TURNER, MG WU, YG ROMME, WH WALLACE, LL AF TURNER, MG WU, YG ROMME, WH WALLACE, LL TI A LANDSCAPE SIMULATION-MODEL OF WINTER FORAGING BY LARGE UNGULATES SO ECOLOGICAL MODELLING LA English DT Article ID MULE DEER; HABITAT; SURVIVAL; PATTERNS; DYNAMICS; GEORGIA; ELK AB Ungulate winter grazing was simulated on simple random and actual landscape patterns using an individual-based modeling approach to explore the effect of landscape heterogeneity on foraging dynamics. The landscape was represented as a 100 x 100 grid with each cell considered to be either a resource or nonresource site. Random maps were generated by specifying the proportion, p, of the landscape occupied by resource sites. Actual landscape maps were obtained from the spatial arrangement of sagebrush-grassland habitats in subsections of northern Yellowstone National Park, Wyoming. Each resource site was assigned an initial forage abundance, and a specified number of ungulates were distributed randomly across the landscape on resource sites. Three alternative search-and-movement rules, which incorporated different movement scales and assumptions about ungulates' knowledge of the landscape, were compared. Grazing was simulated as a recipient-determined, donor-controlled flow with a nonlinear feedback. Daily energy balances were computed for each ungulate by subtracting energy cost from energy gain, and ungulates were assumed to die when they reached 70% of their lean body weight. Simulation results suggested that when resources were abundant across the landscape (i.e., high p), the search-and-movement rule selected to simulate foraging was not important. That is, a variety of strategies should suffice under high-resource conditions, and there was no benefit to having a more efficient rule. However, when resources were scarce (e.g., low p or high ungulate densities), then the ability to discern resource abundances and to move over greater distances resulted in lower mortality. For a given p, the difference between a fragmented (i.e., random) and aggregated (i.e., real) arrangement of resource sites was only pronounced when the ability of the animals to move was very limited. In these situations, survival was always greater in the real landscapes. Individual-based spatial models developed for specific landscapes and species could be quite valuable in enhancing our understanding of landscape dynamics and large herbivores. C1 FT LEWIS COLL,DEPT BIOL,DURANGO,CO 81301. UNIV OKLAHOMA,DEPT BOT & MICROBIOL,NORMAN,OK 73019. RP TURNER, MG (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Turner, Monica/B-2099-2010; Romme, William/C-7317-2016 NR 53 TC 85 Z9 87 U1 2 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD OCT PY 1993 VL 69 IS 3-4 BP 163 EP 184 DI 10.1016/0304-3800(93)90026-O PG 22 WC Ecology SC Environmental Sciences & Ecology GA MA867 UT WOS:A1993MA86700001 ER PT J AU HEPP, GR KENNAMER, RA AF HEPP, GR KENNAMER, RA TI EFFECTS OF AGE AND EXPERIENCE ON REPRODUCTIVE-PERFORMANCE OF WOOD DUCKS SO ECOLOGY LA English DT Article DE AGE-SPECIFIC REPRODUCTIVE SUCCESS; AIX-SPONSA; ANATIDAE; BODY MASS; BREEDING EXPERIENCE; PREDATION RISK; TIME OF BREEDING; WOOD DUCK ID SHEARWATERS PUFFINUS-TENUIROSTRIS; CAERULESCENS-CAERULESCENS; BREEDING EXPERIENCE; WILLOW PTARMIGAN; NATAL PHILOPATRY; LIFE-HISTORY; 2ND BROODS; BODY-MASS; EGG SIZE; SURVIVAL AB Data from a long-term study of Wood Ducks (Aix sponsa) breeding in South Carolina were used to test whether reproductive performance was age specific and to evaluate several hypotheses proposed for age-specific variation. We used known-aged females from 1 through 5 yr of age. Yearling females initiated nests 11-19 d later than older females; heavier females, independent of age, nested earlier than lighter females. One-way analyses of covariance using female body mass and nesting date as covariates indicated that clutch size, mean egg mass, number of ducklings per nest, and the percentage of eggs hatching (hatching success) were independent of female age. Probability of nests producing at least one duckling (nest success) also was not related to female age. We separately tested effects of breeding experience and female age class (yearling vs. adult) on reproductive performance. In the context of this study, females were considered as experienced if they previously were captured using nest boxes and inexperienced if there was no record of nest box use. Adult females with previous breeding experience initiated nests an average of 26 d earlier than adults without previous experience; body mass of experienced adults was greater than that of inexperienced adults. Adult females designated as ''inexperienced'' may have nested previously in natural cavities and were simply changing to nest boxes. Nest-site fidelity is known to affect nesting date, so we also compared nesting dates of inexperienced adults with a subset of experienced females that changed nest sites. Inexperienced adults nested 12 d later than experienced adults that switched nest sites and were nesting on different wetlands from the previous year. Next, we controlled nesting experience and tested specifically for age effects by comparing inexperienced adults with yearlings. Nesting date of inexperienced adults and yearling females did not differ, but body mass of these adults was greater than that of yearlings. There was no evidence that differential survival of heavy, early-nesting yearling females explained age-related patterns in nesting date and female body mass. In fact, late-nesting yearlings survived better than yearling females that initiated nests early. Furthermore, Jolly-Seber estimates of annual survival did not decline with female age, suggesting that older females were able to compensate for any increase in reproductive effort associated with early initiation of nests. Binary regression analyses showed that later nesting females were less likely to initiate second nests and more likely to have nests destroyed by predators. Female Wood Ducks nesting early produced larger clutches, hatched more young from successful nests, were at less risk from predators, and improved their chances of initiating second nests. Adult females at southern latitudes, therefore, should begin nesting as early as possible. Yearling females survive better if they begin nesting later in their 1 st yr. C1 AUBURN UNIV,ALABAMA AGR EXPT STN,AUBURN,AL 36849. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP HEPP, GR (reprint author), AUBURN UNIV,DEPT ZOOL & WILDLIFE SCI,AUBURN,AL 36849, USA. NR 59 TC 42 Z9 43 U1 0 U2 12 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD OCT PY 1993 VL 74 IS 7 BP 2027 EP 2036 DI 10.2307/1940848 PG 10 WC Ecology SC Environmental Sciences & Ecology GA LY549 UT WOS:A1993LY54900014 ER PT J AU GARTEN, CT AF GARTEN, CT TI VARIATION IN FOLIAR N-15 ABUNDANCE AND THE AVAILABILITY OF SOIL-NITROGEN ON WALKER BRANCH WATERSHED SO ECOLOGY LA English DT Article DE FIELD STUDIES; ISOTOPIC INDICATORS; NITRIFICATION; N-15; NITROGEN; NITROGEN AVAILABILITY; N-CYCLING; NITROGEN MINERALIZATION; SITE NITROGEN STATUS; STABLE ISOTOPES; TOPOGRAPHY; WATERSHED ID INFRARED REFLECTANCE SPECTROSCOPY; ISOTOPE FRACTIONATION; NATURAL ABUNDANCE; DECIDUOUS FOREST; RED MAPLE; WHITE OAK; NITRIFICATION; NITRATE; PLANTS; AMMONIUM AB Spatial patterns in natural N-15 abundance (deltaN-15) in soil, soil solutions, and non-N2-fixing plants were studied in the deciduous forest on Walker Branch Watershed near Oak Ridge, Tennessee. This study was undertaken to test the hypothesis that foliar deltaN15 values are related to the availability of inorganic nitrogen in mineral soil. Soils collected in or near valley bottoms on the watershed had higher levels of net nitrogen mineralization and net nitrification potential than those sampled from ridges and slopes. More positive foliar deltaN-15 values occurred in valley bottoms, which, relative to other positions on the watershed, were characterized by greater availability of soil nitrogen and lower C-to-N ratios in the O(i)-horizon, in the surface mineral soil, and in autumn leaf fall. Although leaf nitrogen concentrations changed significantly over the course of the growing season, there was little seasonal variation in foliar deltaN-15 values. A hypothesis about the relative importance of different sources of nitrogen to the forest and how nitrogen cycling varies with topography in this nitrogen-deficient ecosystem was derived, in part, from spatial patterns in natural N-15 abundance. There appear to be two processes affecting the topographic patterns in foliar N-15 abundance on this watershed: (1) greater uptake from isotopically heavy pools of inorganic soil nitrogen by plants in valley bottoms, and (2) uptake of isotopically light ammonium-N in atmospheric deposition by plants on ridges and slopes (where the availability of inorganic soil nitrogen to plant roots is more limited). Results from this study indicate that foliar deltaN-15 values are positively correlated with net nitrification potential in surface soil. RP GARTEN, CT (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,MS 6038,OAK RIDGE,TN 37830, USA. NR 39 TC 192 Z9 201 U1 2 U2 35 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD OCT PY 1993 VL 74 IS 7 BP 2098 EP 2113 DI 10.2307/1940855 PG 16 WC Ecology SC Environmental Sciences & Ecology GA LY549 UT WOS:A1993LY54900021 ER PT J AU LI, J PETELENZ, D JANATA, J AF LI, J PETELENZ, D JANATA, J TI SUSPENDED GATE FIELD-EFFECT TRANSISTOR SENSITIVE TO GASEOUS-HYDROGEN CYANIDE SO ELECTROANALYSIS LA English DT Article DE FIELD-EFFECT TRANSISTOR; HYDROGEN CYANIDE ID WORK FUNCTION AB The optimization, characterization, and analytical performance of a suspended gate field-effect transistor (SGFET), with a selective polyaniline/mercury layer, for monitoring low levels of hydrogen cyanide in air are described. Reversible and reproducible detection is reported. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. UNIV UTAH, DEPT MAT SCI & ENGN, SALT LAKE CITY, UT 84112 USA. NR 14 TC 23 Z9 23 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 1040-0397 J9 ELECTROANAL JI Electroanalysis PD OCT-NOV PY 1993 VL 5 IS 9-10 BP 791 EP 794 DI 10.1002/elan.1140050912 PG 4 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA MC727 UT WOS:A1993MC72700012 ER PT J AU WANG, JC AF WANG, JC TI MODEL FOR IMPEDANCE OF A SOLID IONIC CONDUCTOR SANDWICHED BETWEEN BLOCKING ELECTRODES SO ELECTROCHIMICA ACTA LA English DT Article DE EQUIVALENT CIRCUIT; BLOCKING ELECTRODE; CONSTANT-PHASE-ANGLE ELEMENT; NON-DEBYE DIELECTRIC RESPONSE; ZIRCONIA ID DIELECTRIC RESPONSE; ACTIVATION-ENERGIES; AC RESPONSE; DISTRIBUTIONS; ADMITTANCE; RELAXATION; INTERFACE; SYSTEMS AB The simplest model for the impedance of an ionic conductor sandwiched between two blocking electrodes is a resistor in series with a capacitor (rc pair) representing the bulk material and the conductor-electrode interface, respectively, and a second capacitor parallel to the rc pair representing the electronic dielectric response of the system. In practice, to describe the experimental data satisfactorily, one needs to replace the interface capacitor with a constant-phase-angle (CPA) element and to add a non-Debye dielectric element parallel to the resistor to represent the local ionic movement. In this paper, some of the existing physical models for the CPA and non-Debye dielectric elements are discussed, and an example is presented for analyzing the impedance data using the resultant circuit model. RP WANG, JC (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,APPL PHYS SCI GRP,OAK RIDGE,TN 37831, USA. NR 31 TC 11 Z9 11 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD OCT PY 1993 VL 38 IS 14 BP 2111 EP 2114 DI 10.1016/0013-4686(93)80348-4 PG 4 WC Electrochemistry SC Electrochemistry GA LX860 UT WOS:A1993LX86000049 ER PT J AU HARVEY, DP TERRELL, JB SUDARSHAN, TS LOUTHAN, MR AF HARVEY, DP TERRELL, JB SUDARSHAN, TS LOUTHAN, MR TI PARTICIPATION OF HYDROGEN IN THE IMPACT BEHAVIOR OF 304L STAINLESS-STEEL SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID DUCTILE FRACTURE; ASSISTED CRACKING; EMBRITTLEMENT; NICKEL; IRON AB Charpy V-notched impact test studies on 304L austenitic stainless steel at 293 and 77 K demonstrated that hydrogen charging promoted the formation of wider and shallower microvoids at 293 K, promoted microvoid nucleation at 77 K and reduced the energy absorbed by the material at both temperatures. These observations suggest that the role of hydrogen in the impact behavior of this material is to enhance whatever damage mechanisms are operating at a given temperature. Further, the observation that embrittlement exists even at liquid nitrogen temperatures indicates that little or no localized rearrangement of hydrogen during the test is required or that relatively high strain rate effects on hydrogen embrittlement need not necessarily be attributed to enhanced transport of hydrogen atmospheres by mobile dislocations. The data presented in this paper are consistent with a model in which the mechanism of hydrogen embrittlement is affected by the extent of plastic deformation. C1 REYNOLDS MET CO,RICHMOND,VA 23221. MAT MODIFICAT INC,FAIRFAX,VA 22031. DUPONT CO INC,SAVANNAH RIVER LAB,AIKEN,SC 29801. RP HARVEY, DP (reprint author), USN,RES LAB,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 42 TC 8 Z9 8 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD OCT PY 1993 VL 46 IS 3 BP 455 EP 464 DI 10.1016/0013-7944(93)90237-M PG 10 WC Mechanics SC Mechanics GA MD159 UT WOS:A1993MD15900009 ER PT J AU NILSSON, L SWISHER, J SCHIPPER, L WILHITE, H AF NILSSON, L SWISHER, J SCHIPPER, L WILHITE, H TI ENERGY-CONSERVATION IN SWEDEN SO ENVIRONMENT LA English DT Editorial Material C1 LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720. UNIV OSLO,NORD COUNCIL RESOURCE STUDIES,OSLO 3,NORWAY. RP NILSSON, L (reprint author), LUND UNIV,DEPT ENERGY & ENVIRONM SYST,S-22101 LUND,SWEDEN. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0013-9157 J9 ENVIRONMENT JI Environment PD OCT PY 1993 VL 35 IS 8 BP 4 EP 5 PG 2 WC Environmental Sciences; Environmental Studies SC Environmental Sciences & Ecology GA LZ600 UT WOS:A1993LZ60000005 ER PT J AU FLEXSER, S WOLLENBERG, HA SMITH, AR AF FLEXSER, S WOLLENBERG, HA SMITH, AR TI DISTRIBUTION OF RADON SOURCES AND EFFECTS ON RADON EMANATION IN GRANITIC SOIL AT BEN-LOMOND, CALIFORNIA SO ENVIRONMENTAL GEOLOGY LA English DT Article DE RADON; GRANITIC SOIL; URANIUM RADIOGRAPHY ID URANIUM; SORPTION; MINERALS; PLUTON; ROCKS AB The abundance and distribution of radioelements on bulk and microscopic scales were investigated in residual granitic-derived soil at a facility for investigating the movement of radon into structures. In bulk soil samples, Ra concentrations range from 0.6 to 1.3 pCi/g, and variations in Ra, Th, and K appear to be controlled mainly by heterogeneities inherited from the parent granitic rock, which contains abundant dikes and inclusions. U in soil and parent rock is concentrated in primary minerals (mainly zircon and sphene), and in secondary sites that are of greater importance for Rn emanation. The main U-bearing secondary sites are weathered sphene, grain boundary coatings, weathered biotite and plagioclase, as well as dense Fe-rich coatings and a REE-phosphate mineral present in near-vertical fracture zones in saprolite underlying shallow loam. Elevated U in these sites generally correlates with high Ti, Al, Fe, and/or P. Preferential distribution of U and Ra on grain boundaries and porous weathered minerals is reflected in relatively high Rn emanation rates in the soil. Highest emanation occurs between 1.3 and 2.3 m depth, where fine pedogenic phases-gibbsite and amorphous silica and Fe-OOH-are most abundant; it is related to fixation of Ra by these phases, which precipitate close to the surface and accumulate at these depths by illuviation. Separation of Ra from U may occur locally, given remobilization of U-series elements from secondary sites, and large differences between Ra and U sorption capabilities of several phases present in the soil. Concentration of U along permeable fracture zones in saprolite suggests that contribution of soil-gas Rn from depth (> 2 m) could be significant to Rn availability near the surface. RP FLEXSER, S (reprint author), LAWRENCE BERKELEY LAB,DIV EARTH SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 15 TC 16 Z9 17 U1 1 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0177-5146 J9 ENVIRON GEOL JI Environ. Geol. PD OCT PY 1993 VL 22 IS 2 BP 162 EP 177 PG 16 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA MG697 UT WOS:A1993MG69700008 ER PT J AU WOLFF, S AFZAL, V JOSTES, RF WIENCKE, JK AF WOLFF, S AFZAL, V JOSTES, RF WIENCKE, JK TI INDICATIONS OF REPAIR OF RADON-INDUCED CHROMOSOME-DAMAGE IN HUMAN-LYMPHOCYTES - AN ADAPTIVE RESPONSE INDUCED BY LOW-DOSES OF X-RAYS SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article ID NEUROSPORA ENDONUCLEASE; ABERRATION PRODUCTION; CELL-CYCLE; RADIATION; THYMIDINE; INDUCTION; EXPOSURE; INVITRO AB Naturally occurring radon is a relatively ubiquitous environmental carcinogen to which large numbers of people can be exposed over their lifetimes. The accumulation of radon in homes, therefore, has led to a large program to determine the effects of the densely ionizing alpha particles that are produced when radon decays. In human lymphocytes, low doses of X-rays can decrease the number of chromatid deletions induced by subsequent high doses of clastogens. This has been attributed to the induction of a repair mechanism by the low-dose exposures. Historically, chromosome aberrations induced by radon have been considered to be relatively irreparable. The present experiments, however, show that if human peripheral blood lymphocytes are irradiated with low doses of X-rays (2 cGy) at 48 hr of culture, before being exposed to radon at 72 hr of culture, the yield of chromatid deletions induced by radon is decreased by a factor of two. Furthermore, the numbers of aberrations per cell do not follow a Poisson distribution but are overdispersed, as might be expected because high-linear energy transfer (high LET) alpha particles have a high relative biological effectiveness compared to low-LET radiations such as X-rays or gamma rays. Pretreatment with a low dose of X-rays decreases the overdispersion and leads to a greater proportion of the cells having no aberrations, or lower numbers of aberrations, than is the case in cells exposed to radon alone. It therefore appears that the putative chromosomal repair mechanism induced by low doses of sparsely ionizing radiation is also effective in reducing cytogenetic damage induced by alpha particles, which hitherto had been thought to be relatively immune to repair processes. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV CALIF SAN FRANCISCO, DEPT EPIDEMIOL & BIOSTAT, SAN FRANCISCO, CA 94143 USA. RP WOLFF, S (reprint author), UNIV CALIF SAN FRANCISCO, RADIOBIOL & ENVIRONM HLTH LAB, BOX 0750, ROOM LR102, SAN FRANCISCO, CA 94143 USA. NR 23 TC 6 Z9 7 U1 0 U2 0 PU US DEPT HEALTH HUMAN SCIENCES PUBLIC HEALTH SCIENCE PI RES TRIANGLE PK PA NATL INST HEALTH, NATL INST ENVIRONMENTAL HEALTH SCIENCES, PO BOX 12233, RES TRIANGLE PK, NC 27709-2233 USA SN 0091-6765 EI 1552-9924 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD OCT PY 1993 VL 101 SU 3 BP 73 EP 77 DI 10.2307/3431703 PG 5 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA MN668 UT WOS:A1993MN66800014 PM 8143650 ER PT J AU HSIE, AW XU, Z YU, Y AN, J MELTZ, ML SCHWARTZ, JL HRELIA, P AF HSIE, AW XU, Z YU, Y AN, J MELTZ, ML SCHWARTZ, JL HRELIA, P TI QUANTITATIVE AND MOLECULAR ANALYSES OF GENETIC RISK - A STUDY WITH IONIZING-RADIATION SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article ID HAMSTER OVARY CELLS; PHOSPHORIBOSYL TRANSFERASE LOCUS; CHO-HGPRT SYSTEM; AS52 CELLS; MUTATION-INDUCTION; MAMMALIAN-CELLS; CHEMICALS; ASSAY AB Mammalian cells in culture have been used to study the genetic effects of physical and chemical agents. We have used Chinese hamster ovary (CHO) cells, clone K1-BH4, to quantify mutations at the X-linked, large (35 kb) hypoxanthine-guanine phosphoribosyltransferase (hprt) locus (the CHO/HPRT assay) induced by environmental agents. By transfecting an hprt-deletion mutant CHO cell line with the plasmid vector pSV2gpt, we isolated a transformant, AS52. AS52 cells carry a single functional copy of an autosomal, small (456 bp) xanthine-guanine phosphoribosyltransferase (gpt) gene (the bacterial equivalent of the mammalian hprt gene; AS52/GPT assay). We found that ionizing radiations such as X-rays and neutrons and oxidative genotoxic chemicals such as Adriamycin, bleomycin, hydrogen peroxide, and potassium superoxide are much more mutagenic to the gpt gene in AS52 cells than to the hprt locus in KI-BH4 cells. The hypermutability of the gpt gene probably results from a higher recovery of multilocus deletion mutants in AS52 cells than in K1-BH4 cells, rather than a higher yield of induced mutants. These results demonstrate that the use of the hprt locus alone could lead to an underestimate of the genetic risk of these agents. Analyses of the mutation spectrum using polymerase chain reaction-based deletion screening and DNA sequencing procedure showed that a high proportion of HPRT and GPT mutants induced by X-rays carry deletion mutations. ThuS, both the mutant frequency and mutation spectrum need to be considered in assessing the genetic risk of ionizing radiation and oxidative genotoxic chemicals. C1 UNIV TEXAS,HLTH SCI CTR,DEPT RADIOL,SAN ANTONIO,TX 78284. ARGONNE NATL LAB,DIV BIOL & MED,ARGONNE,IL 60439. UNIV BOLOGNA,INST PHARMACOL,I-40126 BOLOGNA,ITALY. RP HSIE, AW (reprint author), UNIV TEXAS,MED BRANCH,DEPT PREVENT MED & COMMUNITY HLTH,GALVESTON,TX 77555, USA. NR 22 TC 11 Z9 11 U1 0 U2 0 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD OCT PY 1993 VL 101 SU 3 BP 213 EP 218 DI 10.2307/3431728 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA MN668 UT WOS:A1993MN66800039 PM 8143620 ER PT J AU AHMED, FE HATTIS, D WOLKE, RE STEINMAN, D AF AHMED, FE HATTIS, D WOLKE, RE STEINMAN, D TI HUMAN HEALTH RISKS DUE TO CONSUMPTION OF CHEMICALLY CONTAMINATED FISHERY PRODUCTS SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article AB A small proportion of fishery products contaminated with appreciable amounts of potentially hazardous inorganic and organic contaminants from natural and environmental sources seem to pose the greatest potential for toxicity to consumers of fishery products in the United States. Health risks due to chemicals (e.g, modest changes in the overall risk of cancer, subtle deficits of neurological development in fetuses and children) are difficult to measure directly in people exposed to low levels. Immunocompetence may increase cancer risk. Inferences about the potential magnitude of these problems must be based on the levels of specific chemical present, observations of human populations and experimental animals exposed to relatively high doses, and theories about the likely mechanisms of action of specific intoxicants and the population distribution of sensitivity of human exposure. Lognormal distributions were found to provide good descriptions of the pattern of variation of contaminant concentrations among different species and geographic areas; this variability offers a solution for reduction of exposure through restricting harvest of aquatic animals from certain sites and by excluding certain species. Available information suggest that risks are not generally of high magnitude; nevertheless, their control will significantly improve public health. The following recommendations will help to reduce risk to humans: existing state and Federal regulations and environmental monitoring must be strengthened and enforced to improve the quality of the environment; a program of shared responsibility where Federal agencies develop a set of monitoring and inspection practices and state governments are responsible for site closures and issuing advisories should be established; research and public education by government agencies and health professionals should be expanded; mandatory labeling should be considered for specific contaminants; and a better system requiring international agreements should be developed to identify country of origin of imported fishery products and to harmonize product safety and quality. C1 ARIZONA REPUBL NEWSPAPER,LOS ANGELES,CA 90065. NATL ACAD SCI,INST MED,WASHINGTON,DC 20418. CLARK UNIV,CTR TECHNOL ENVIRONM & DEV,WORCESTER,MA 01610. UNIV RHODE ISL,COMPARAT AQUAT PATHOL LAB,KINGSTON,RI 02881. RP AHMED, FE (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 28 TC 3 Z9 3 U1 0 U2 2 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD OCT PY 1993 VL 101 SU 3 BP 297 EP 302 DI 10.2307/3431742 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA MN668 UT WOS:A1993MN66800053 PM 8143635 ER PT J AU HARDING, AK HOLDREN, GR AF HARDING, AK HOLDREN, GR TI ENVIRONMENTAL EQUITY AND THE ENVIRONMENTAL PROFESSIONAL SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article C1 PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, RES STAFF, RICHLAND, WA 99352 USA. RP HARDING, AK (reprint author), OREGON STATE UNIV, DEPT PUBL HLTH, CORVALLIS, OR 97331 USA. NR 20 TC 7 Z9 7 U1 0 U2 0 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 OCT PY 1993 VL 27 IS 10 BP 1990 EP 1993 DI 10.1021/es00047a602 PG 4 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA LZ749 UT WOS:A1993LZ74900009 ER PT J AU GUNDEL, LA DAISEY, JM DECARVALHO, LRF KADO, NY SCHUETZLE, D AF GUNDEL, LA DAISEY, JM DECARVALHO, LRF KADO, NY SCHUETZLE, D TI POLAR ORGANIC-MATTER IN AIRBORNE PARTICLES - CHEMICAL CHARACTERIZATION AND MUTAGENIC ACTIVITY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID BIOASSAY-DIRECTED FRACTIONATION; PARTICULATE EXTRACTS; MUTAGENICITY; GENOTOXICITY; SYSTEM AB Polar organic matter (extracted from inhalable particles collected in Elizabeth, NJ, and from National Institute of Standards and Technology Standard Reference Material SRM 1649) has been characterized by determining elemental and ionic composition, chemical classes, and mutagenic activity. The acetone extracts of SRM 1649 and Elizabeth, NJ, samples were 46 and 40 % carbon, respectively. When compared to the NJ extract, the SRM extract was enriched in aldehydes and ketones and deficient in carboxylic acids. Significant amounts of organic nitrogen were found in both extracts. Infrared spectra and class tests suggested the presence of nitro compounds, organic nitrates or nitrites, amines, and amides. Fluorescence suggested the presence of polycyclic aromatic species. For SRM 1649 the acetone extracts accounted for 36 % (-S9) and 40 % (+S9) of the mutagenic activity in the Ames assay with TA98 (specific mutagenic activity). The acetone extract of SRM 1649 had about four times greater mutagenic activity than that from the NJ particles. Both extracts showed substantial decreases in mutagenic activity when tested with nitroreductase-deficient strains of TA98. A simple resolubilization of the NJ extract concentrated the most mutagenic components into the least polar of the three fractions. C1 UNIV SAO PAULO,INST QUIM,SAO PAULO,BRAZIL. UNIV CALIF DAVIS,DEPT ENVIRONM TOXICOL,DAVIS,CA 95616. CALIF AIR RESOURCES BOARD,DIV RES,SACRAMENTO,CA 95812. FORD MOTOR CO,SCI RES LAB,DEARBORN,MI 48121. RP GUNDEL, LA (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720, USA. RI Carvalho, Lilian/H-8562-2012; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 NR 29 TC 37 Z9 40 U1 0 U2 3 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 OCT PY 1993 VL 27 IS 10 BP 2112 EP 2119 DI 10.1021/es00047a017 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA LZ749 UT WOS:A1993LZ74900024 ER PT J AU LITTLEJOHN, D WANG, YZ CHANG, SG AF LITTLEJOHN, D WANG, YZ CHANG, SG TI OXIDATION OF AQUEOUS SULFITE ION BY NITROGEN-DIOXIDE SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID HYDROGEN-PEROXIDE; SULFUR-DIOXIDE; FLUE-GAS; LOW PH; DENITRIFICATION SYSTEM; KINETICS; RADICALS; SO2; DESULFURIZATION; SPECTROSCOPY AB The reaction of nitrogen dioxide with aqueous sulfite solutions, in the presence and in the absence of oxygen, has been studied using Raman spectroscopy to determine product concentrations. The products observed include nitrite, sulfate, and dithionate ions. The reaction appears to initially produce nitrite ion and sulfite radical: NO2 + SO32- --> NO2- + SO3.-. The sulfite radical can undergo either recombination or reaction with oxygen to form SO5.-. In the absence of oxygen, we obtain a ratio of [SO42-]/[S2O62-] = 1.8 +/- 0.3, reflecting the branching of the recombination of sulfite radical: SO3.- + SO3.- --> S2O62- or SO3.- + SO3.- --> SO32- + SO3. The production Of SO3.- and SO5.- radicals from the nitrogen dioxide-sulfite ion reaction suggests that this reaction could contribute significantly to S(IV) oxidation in atmospheric aerosols under suitable conditions. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. NR 36 TC 59 Z9 66 U1 5 U2 22 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 OCT PY 1993 VL 27 IS 10 BP 2162 EP 2167 DI 10.1021/es00047a024 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA LZ749 UT WOS:A1993LZ74900031 ER PT J AU SCRIBNER, KT CONGDON, JD CHESSER, RK SMITH, MH AF SCRIBNER, KT CONGDON, JD CHESSER, RK SMITH, MH TI ANNUAL DIFFERENCES IN FEMALE REPRODUCTIVE SUCCESS AFFECT SPATIAL AND COHORT-SPECIFIC GENOTYPIC HETEROGENEITY IN PAINTED TURTLES SO EVOLUTION LA English DT Article DE BREEDING STRUCTURE; CHRYSEMYS; GENE CORRELATIONS; GENETIC VARIANCE; HETEROZYGOSITY; RECRUITMENT; TURTLES ID PSEUDEMYS-SCRIPTA; GENE DIVERSITY; CHRYSEMYS-PICTA; F-STATISTICS; BODY SIZE; POPULATIONS; FREQUENCIES; DEMOGRAPHY AB Long-term ecological data were used to evaluate the relative importance of movements, breeding structure, and reproductive ecological factors to the degree of spatial and age-specific variation in genetic characteristics of painted turtles (Chrysemys picta) on the E. S. George Reserve in southeastern Michigan. Estimates of the degree of spatial genetic structuring were based on the proportion of total genotypic variance partitioned within and between subpopulations (inferred from hierarchical F-statistics based on variation at 18 protein loci), and in terms of gene correlations (co-ancestry among individuals derived from reproductive data on full-sib families of females nesting at specific nesting areas). Little variation in allele frequency was observed among turtles from different marshes (F-mt = 0.003), though significant variation was observed among turtles from different nesting areas associated with each marsh (F-nm = 0.046). Gene correlations among individuals within nesting areas varied greatly over years (0.032-0.171; mean = 0.069) and were negatively correlated to the proportion of females that successfully nested during each year. General concordance between independent estimates of genotypic correlations (i.e., F-nm derived from protein electrophoretic variation vs. mean co-ancestry) suggests that allozyme data, when collected over spatial scales consistent with species behavioral characteristics and reproductive ecology, may accurately reflect the apportionment of gene diversity within and among subpopulations. The magnitude and patterning of allelic variation among nesting areas and individuals appears to be primarily a function of gametic correlations among members of full-sib families, irrespective of the degree of gene flow or female nesting-site fidelity. Comparisons of genetic characteristics among 11 cohorts (1974-1984) revealed that heterozygosity (H) and inbreeding coefficients (F) varied greatly. Cohort estimates of H and F were correlated to female nesting success and to estimates of co-ancestry for the same years. Results clearly reflect the concomitant importance of ecological factors (principally the proportion of the female population that successfully produce offspring during each year) in determining the magnitude and patterning of gene correlations within and among groups, and to the genotypic composition of offspring born during each year. C1 UNIV GEORGIA,DEPT ZOOL,ATHENS,GA 30602. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. NR 38 TC 32 Z9 33 U1 1 U2 10 PU SOC STUDY EVOLUTION PI LAWRENCE PA 810 E 10TH STREET, LAWRENCE, KS 66044 SN 0014-3820 J9 EVOLUTION JI Evolution PD OCT PY 1993 VL 47 IS 5 BP 1360 EP 1373 DI 10.2307/2410153 PG 14 WC Ecology; Evolutionary Biology; Genetics & Heredity SC Environmental Sciences & Ecology; Evolutionary Biology; Genetics & Heredity GA NM707 UT WOS:A1993NM70700006 ER PT J AU DYONLAURENT, C ROMAND, S BIEGON, A SARA, S AF DYONLAURENT, C ROMAND, S BIEGON, A SARA, S TI FUNCTIONAL REORGANIZATION OF THE NORADRENERGIC SYSTEM AFTER PARTIAL FORNIX SECTION - A BEHAVIORAL AND AUTORADIOGRAPHIC STUDY SO EXPERIMENTAL BRAIN RESEARCH LA English DT Article DE FORNIX LESION; SPATIAL LEARNING; BETA-RECEPTORS; ALPHA(2)-RECEPTORS; LOCUS-CERULEUS; RAT ID BETA-ADRENERGIC RECEPTORS; HIPPOCAMPAL SYMPATHETIC INGROWTH; BINDING-SITES; RAT-BRAIN; LOCUS COERULEUS; SEPTAL-LESIONS; HYPERACTIVITY; LOCALIZATION; PERFORMANCE; TRANSPLANTS AB Previous experiments revealed that the cholinergic deficit in rats with a partial fornix section was accompanied by an increase in turnover of noradrenaline (NE) in the hippocampus. This noradrenergic hyperactivity contributed to the cognitive deficit in lesioned rats, probably by interaction with the cholinergic system. The present experiment examines the reorganization of the noradrenergic system after the damage induced by partial fornix section and attempts to determine if the increase in NE turnover is of locus coeruleus (LC) origin, or if it is a result of local regulation at the noradrenergic terminals. Rats were submitted to knife-cut section of the fornix, resulting in a decrease in choline acetyltransferase activity in the hippocampus, correlated with a significant behavioral deficit in a spatial memory task. Lesioned rats learned a nonspatial memory task normally. Sections of brains of these rats were submitted to quantitative autoradiography. [I-125]Iodopindolol binding was assessed in the dorsal and ventral hippocampus to determine availability of beta receptors. This was found to be significantly lower in lesioned rats. [I-125]Iodoclonidine was used to determine alpha2 receptors binding in dorsal and ventral hippocampus and in LC. There was no difference in alpha2 receptors in LC, a significant decrease in dorsal regions of the hippocampus, and a significant increase in ventral regions. Muscarinic M1 receptors in the hippocampus showed no changes after the lesion. C1 UNIV PARIS 06,INST NEUROSCI,9 QUAI ST BERNARD,F-75230 PARIS 05,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 36 TC 9 Z9 9 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0014-4819 J9 EXP BRAIN RES JI Exp. Brain Res. PD OCT PY 1993 VL 96 IS 2 BP 203 EP 211 PG 9 WC Neurosciences SC Neurosciences & Neurology GA MC860 UT WOS:A1993MC86000003 PM 8270017 ER PT J AU RITCHIE, B AF RITCHIE, B TI RADIATION REACTION .2. SO FOUNDATIONS OF PHYSICS LETTERS LA English DT Article DE ATOM; DECAY; GROUND STATE AB Regularized classical field theory [B. Ritchie, Found. Phys. Lett. 4, 375 (1991)] is used to derive a new model for the Coulomb problem of an electron bound to an infinitely heavy nucleus. The model is solved numerically and interesting results are obtained, including the prediction of a stable ground state. RP RITCHIE, B (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0894-9875 J9 FOUND PHYS LETT JI Found. Phys. Lett. PD OCT PY 1993 VL 6 IS 5 BP 451 EP 468 DI 10.1007/BF00682792 PG 18 WC Physics, Multidisciplinary SC Physics GA MH177 UT WOS:A1993MH17700003 ER PT J AU BAXTER, LL DESOLLAR, RW AF BAXTER, LL DESOLLAR, RW TI A MECHANISTIC DESCRIPTION OF ASH DEPOSITION DURING PULVERIZED COAL COMBUSTION - PREDICTIONS COMPARED WITH OBSERVATIONS SO FUEL LA English DT Article DE ASH; DEPOSITION; COMBUSTION ID LAMINAR BOUNDARY-LAYERS; RATES; TRANSPORT; PARTICLES; SYSTEMS; WALLS AB A mechanistic model of ash deposition is based on the transformations of mineral species in coal during transport of particles through an arbitrary combustion environment. Quantitative predictions include the elemental composition of boiler ash deposits as a function of location, operating conditions and coal type. Qualitative predictions relating to practical aspects of boiler operation are also included. Model predictions are compared with experimental results at pilot and utility scales. A three-week test burn of a Wyoming coal in a power plant boiler designed for midwestern and eastern coal is described. Data reported include deposit accumulation rate, strength, morphology, removability, emissivity and elemental composition. Similar data are also reported for the Sandia multifuel combustor, a pilot-scale facility. Deposits from the Wyoming coal accumulated at about the same rate as those from the fuel used previously. The deposits from the Wyoming coal were granular and friable. They were easily removed from boiler heat transfer surfaces by normal soot blowing practices. They were light-coloured and highly reflective. All these qualitative trends are consistent with model predictions. The measured elemental composition of the ash deposits from the Wyoming coal is within approximately 5% (absolute) of the predicted composition. C1 CENT ILLINOIS PUBL SERV CO,SPRINGFIELD,IL 62701. RP BAXTER, LL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550, USA. RI Baxter, Larry/C-8567-2009 OI Baxter, Larry/0000-0002-0453-2659 NR 38 TC 46 Z9 51 U1 0 U2 9 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 OCT PY 1993 VL 72 IS 10 BP 1411 EP 1418 DI 10.1016/0016-2361(93)90417-Z PG 8 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA LY819 UT WOS:A1993LY81900005 ER PT J AU BOYLE, J RUSSELL, A YAO, SC ZHOU, Q EKMANN, J FU, Y MATHUR, M AF BOYLE, J RUSSELL, A YAO, SC ZHOU, Q EKMANN, J FU, Y MATHUR, M TI REDUCTION OF NITROGEN-OXIDES FROM POSTCOMBUSTION GASES UTILIZING MOLECULAR RADICAL SPECIES SO FUEL LA English DT Article DE NITROGEN; COMBUSTION; KINETICS ID INJECTION; AMMONIA AB Plasma induced radicals from ammonia, methane and hydrogen have been injected into NO laden post-combustion gases to reduce pollutant concentrations. Results of chemical kinetics modelling indicate that radicals from ammonia, which are formed by interaction with an argon plasma stream, introduced into the post-combustion gases, will provide nearly complete NO removal. Laboratory investigations have shown that molecular radical reduction is capable of providing up to 94 mol% NO reduction. Streams of ammonia or combined ammonia/methane, which provide this reduction, utilize a minimum input energy and yield no substantial ammonia discharge. C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. RP BOYLE, J (reprint author), CARNEGIE MELLON UNIV,DEPT MECH ENGN,PITTSBURGH,PA 15213, USA. RI Yao, Shi-chune/D-6006-2013 NR 14 TC 14 Z9 15 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 OCT PY 1993 VL 72 IS 10 BP 1419 EP 1427 DI 10.1016/0016-2361(93)90418-2 PG 9 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA LY819 UT WOS:A1993LY81900006 ER PT J AU TAYLOR, BE GABRIEL, W AF TAYLOR, BE GABRIEL, W TI OPTIMAL ADULT GROWTH OF DAPHNIA IN A SEASONAL ENVIRONMENT SO FUNCTIONAL ECOLOGY LA English DT Article DE LIFE HISTORY; PREDATION; RESOURCE ALLOCATION; VARIABLE SEASON AB 1. The cladoceran Daphnia serves as an example of an iteroparous organism, with overlapping generations, that is capable of substantial adult growth. The life history of Daphnia was modelled as the consequence of a series of decisions about allocation of energetic resources to growth and reproduction. 2. We used numerical methods to find resource allocation patterns that maximized fitness of Daphnia in a temporally variable environment. Temporal variation was modelled as alternating active and dormant seasons; length of the active season was uniformly distributed. Fitness was measured by the geometric mean of resting eggs produced at the end of the active season. We examined effects of mean and range of the active season on the optimal life history; we also examined effects of increasing (invertebrate predation), constant (non-selective) and decreasing (fish) size-specific survival rates. For comparison, we found resource allocation patterns that maximized fitness in a constant environment, where fitness was measured by the intrinsic rate of increase r. 3. Life histories optimized for seasonal environments generally showed earlier maturity and greater adult growth than those optimized for constant environments. Adult growth occurred with non-selective predation, and even with fish predation, conditions under which it does not occur in the optimal life histories for constant environments. 4. Greatest size at maturity and adult growth occurred in life histories optimized to invertebrate predation in seasonal environments. Smallest size at maturity and least adult growth occurred in life histories optimized to fish predation. 5. In the optimal life histories, size at maturity generally increased with mean length of the active season. Adult growth reached a maximum for mean seasons of length equal to about one-half to one life span of Daphnia. 6. Increasing the variation in season length decreased adult growth in the optimal life history, but had little effect on size at maturity. 7. We expect that life histories are adapted to the long-term average of season length and its variation. If the animals can detect the type of predator, selection could favour phenotypic variation in resource allocation. RP TAYLOR, BE (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 0 TC 28 Z9 29 U1 4 U2 11 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0269-8463 J9 FUNCT ECOL JI Funct. Ecol. PD OCT PY 1993 VL 7 IS 5 BP 513 EP 521 DI 10.2307/2390126 PG 9 WC Ecology SC Environmental Sciences & Ecology GA MF042 UT WOS:A1993MF04200001 ER PT J AU MORGAN, DL MAHLER, JF DILL, JA PRICE, HC OCONNOR, RW ADKINS, B AF MORGAN, DL MAHLER, JF DILL, JA PRICE, HC OCONNOR, RW ADKINS, B TI STYRENE INHALATION TOXICITY STUDIES IN MICE .2. SEX-DIFFERENCES IN SUSCEPTIBILITY OF B6C3F1 MICE SO FUNDAMENTAL AND APPLIED TOXICOLOGY LA English DT Article ID GLUTATHIONE; METABOLISM; RAT; OXIDE; MOUSE; LIVER C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. MANTECH ENVIRONM TECHNOL INC, RES TRIANGLE PK, NC 27709 USA. RP MORGAN, DL (reprint author), NIEHS, MD IF-00, RES TRIANGLE PK, NC 27709 USA. NR 30 TC 27 Z9 27 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 0272-0590 J9 FUND APPL TOXICOL JI Fundam. Appl. Toxicol. PD OCT PY 1993 VL 21 IS 3 BP 317 EP 325 DI 10.1006/faat.1993.1104 PG 9 WC Toxicology SC Toxicology GA MC193 UT WOS:A1993MC19300007 PM 8258385 ER PT J AU MORGAN, DL MAHLER, JF DILL, JA PRICE, HC OCONNOR, RW ADKINS, B AF MORGAN, DL MAHLER, JF DILL, JA PRICE, HC OCONNOR, RW ADKINS, B TI STYRENE INHALATION TOXICITY STUDIES IN MICE .3. STRAIN DIFFERENCES IN SUSCEPTIBILITY SO FUNDAMENTAL AND APPLIED TOXICOLOGY LA English DT Article ID STYRENE-7,8-OXIDE C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. MANTECH ENVIRONM TECHNOL INC, RES TRIANGLE PK, NC 27709 USA. RP MORGAN, DL (reprint author), NIEHS, MD IF-00, RES TRIANGLE PK, NC 27709 USA. NR 19 TC 33 Z9 33 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 0272-0590 J9 FUND APPL TOXICOL JI Fundam. Appl. Toxicol. PD OCT PY 1993 VL 21 IS 3 BP 326 EP 333 DI 10.1006/faat.1993.1105 PG 8 WC Toxicology SC Toxicology GA MC193 UT WOS:A1993MC19300008 PM 8258386 ER PT J AU FERNAU, ME MAKOFSKE, WJ SOUTH, DW AF FERNAU, ME MAKOFSKE, WJ SOUTH, DW TI REVIEW AND IMPACTS OF CLIMATE-CHANGE UNCERTAINTIES SO FUTURES LA English DT Article ID GENERAL-CIRCULATION MODELS; RADIATION BUDGET EXPERIMENT; GLOBAL CLIMATE; CARBON-DIOXIDE; GREENHOUSE GASES; ATMOSPHERIC CO2; FOSSIL-FUEL; SEA-LEVEL; ICE-SHEET; CLOUD AB This article examines the status of the scientific uncertainties in predicting and verifying global climate change that hinder aggressive policy making. More and better measurements and statistical techniques are needed to detect and confirm the existence of greenhouse-gas-induced climate change, which currently cannot be distinguished from natural climate variability in the historical record. Uncertainties about the amount and rate of change of greenhouse gas emissions also make prediction of the magnitude and timing of climate change difficult. Because of inadequacies in the knowledge and depiction of physical processes and limited computer technology, predictions from existing computer models vary widely, particularly on a regional basis, and are not accurate enough yet for use in policy decisions. The extent of all these uncertainties is such that moving beyond no-regrets measures such as conservation will take political courage and may be delayed until scientific uncertainties are reduced. C1 RAMAPO COLL,MAHWAH,NJ 07430. RP FERNAU, ME (reprint author), ARGONNE NATL LAB,DIV ENVIRONM ASSESSMENT & INFORMAT SCI,ARGONNE,IL 60439, USA. NR 93 TC 3 Z9 3 U1 0 U2 4 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-3287 J9 FUTURES JI Futures PD OCT PY 1993 VL 25 IS 8 BP 850 EP 863 DI 10.1016/0016-3287(93)90034-Q PG 14 WC Economics; Planning & Development SC Business & Economics; Public Administration GA MF051 UT WOS:A1993MF05100002 ER PT J AU CHERNIAK, DJ RYERSON, FJ AF CHERNIAK, DJ RYERSON, FJ TI A STUDY OF STRONTIUM DIFFUSION IN APATITE USING RUTHERFORD BACKSCATTERING SPECTROSCOPY AND ION-IMPLANTATION SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID OXYGEN DIFFUSION; LEAD DIFFUSION; ANORTHITE; MINERALS; HYDROGEN; KINETICS; PRESSURE; MAGMAS AB Strontium diffusion in Durango fluorapatite has been measured under anhydrous conditions using a combination of techniques. Diffusants were introduced into the apatite by two methods: (1) ion implantation of Sr, and (2) immersion in a strontium oxide reservoir. Resulting diffusion profiles were measured by Rutherford Backscattering Spectrometry (RBS) and fit to the appropriate solutions of the diffusion equation to obtain diffusion coefficients. Previous determinations of Sr diffusion in apatite obtained under hydrous conditions (FARVER and GILETTI, 1989) indicate that a decrease in activation energy occurs at approximately 1000-degrees-C. In contrast, diffusivities obtained in the present work may be described by a simple Arrhenius relationship: D = 2.7 X 10(-3) exp (-65000 +/- 2200 cal/mol/RT) cm2 sec-1 for diffusion perpendicular to c over the temperature range 700-1050-degrees-C. Similar results are obtained for transport parallel to c. As in the case of Pb diffusion in apatite (CHERNIAK et al., 199 1 ), the results of the present study lie on the down-temperature extrapolation of diffusion coefficients determined under dry conditions at higher temperatures (WATSON et al., 1985). Radiation damage induced by ion implantation may, in some cases, enhance or otherwise affect diffusion parameters. To assess the significance of such effects in apatite, the Sr results obtained by ion implantation were compared with those from a set of experiments in which Sr was introduced by immersion of the crystals in strontium oxide powder. Excellent agreement of diffusion coefficients from the two data sets indicates that radiation damage does not adversely affect these measurements of Sr diffusion in apatite made under anhydrous conditions. The measured diffusivities suggest that strontium isotope ratios in the cores of apatite crystals entrained in felsic magmas or residual to crustal anatexis may be unaffected by the Strontium isotopic compositions of their surroundings for the temperatures and durations typical of these events. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP CHERNIAK, DJ (reprint author), RENSSELAER POLYTECH INST,DEPT EARTH & ENVIRONM SCI,TROY,NY 12180, USA. NR 38 TC 74 Z9 75 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1993 VL 57 IS 19 BP 4653 EP 4662 DI 10.1016/0016-7037(93)90190-8 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MD265 UT WOS:A1993MD26500010 ER PT J AU HORITA, J COLE, DR WESOLOWSKI, DJ AF HORITA, J COLE, DR WESOLOWSKI, DJ TI THE ACTIVITY-COMPOSITION RELATIONSHIP OF OXYGEN AND HYDROGEN ISOTOPES IN AQUEOUS SALT-SOLUTIONS .2. VAPOR-LIQUID WATER EQUILIBRATION OF MIXED SALT-SOLUTIONS FROM 50 TO 100-DEGREES-C AND GEOCHEMICAL IMPLICATIONS SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID STABLE ISOTOPE; DEUTERIUM FRACTIONATION; DEAD-SEA; BRINES; SYSTEM AB The difference between oxygen and hydrogen isotope activity and composition ratios of water in mixed salt solutions in the system Na-K-Mg-Ca-Cl-SO4-H2O was determined by means of a vapor-liquid water equilibration method over the temperature range of 50 to 100-degrees-C. The observed isotope salt effects in complex mixed salt solutions to very high ionic strengths agree quantitatively with calculations based on the assumption of a simple additive property of the isotope salt effects of the individual salts in the solutions. SOFER and GAT (1972, 1975) and HORITA and GAT ( 1 989) also observed that this simple mixing rule applies to synthetic and natural chloride-mixed salt solutions at room temperature. Equations to convert between the isotope activity and composition scales for brines and fractionation factors between brines and other substances are presented. For most geochemical interactions between brines and other phases (vapor, gases, minerals) such as evaporation/boiling, mineral precipitation, and mineral/rock alteration, the isotope activity scale should be used. The isotope composition scale, on the other hand, is most useful for studies of mixing of different brines and formation of brines by mineral dissolution. Misusage of the two isotopic scales of brines will, and probably in the literature has, lead to incorrect conclusions in many isotopic studies of brine-dominated systems (origin of brines, temperature of mineral formation, isotope ratios of fossil fluids). RP HORITA, J (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,MS 6110,OAK RIDGE,TN 37831, USA. NR 27 TC 61 Z9 63 U1 6 U2 13 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1993 VL 57 IS 19 BP 4703 EP 4711 DI 10.1016/0016-7037(93)90194-2 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MD265 UT WOS:A1993MD26500014 ER PT J AU ANDERKO, A PITZER, KS AF ANDERKO, A PITZER, KS TI PHASE-EQUILIBRIA AND VOLUMETRIC PROPERTIES OF THE SYSTEMS KCL-H(2)0 AND NACL-KCL-H2O ABOVE 573-K - EQUATION OF STATE REPRESENTATION SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID SYNTHETIC FLUID INCLUSIONS; THERMODYNAMIC-PTX ANALYSIS; SOLID-LIQUID EQUILIBRIA; HIGH-TEMPERATURES; HARD SPHERES; MIXTURES; PRESSURES; KCL-H2O AB A comprehensive equation of state has been developed for the system KCl-H2O at high temperatures and pressures. The equation is based on a theoretical model developed earlier for the system NaCl-H2O. Experimental vapor-liquid equilibrium solid-liquid equilibrium, and density data have been critically evaluated and used to fit the adjustable parameters of the model. The equation of state reproduces these properties within experimental uncertainty. It is valid for temperatures between 573 K and 973 K and pressures up to 5 kbar. Graphs are presented to provide recommended values of phase compositions and volumetric properties. Furthermore, the equations for NaCl-H2O and KCl-H2O have been combined to yield an equation for the ternary system NaCl-KCl-H2O. The equation reproduces solid-liquid equilibrium data for the ternary system and agrees with the available semiquantitative information about the relative concentration of Na and K in the vapor phase. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. OI Anderko, Andrzej/0000-0002-1522-4889 NR 22 TC 72 Z9 75 U1 5 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1993 VL 57 IS 20 BP 4885 EP 4897 DI 10.1016/0016-7037(93)90127-I PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MJ386 UT WOS:A1993MJ38600002 ER PT J AU TURA, MAC JOHNSON, LR AF TURA, MAC JOHNSON, LR TI A STABLE METHOD FOR LINEARIZED INVERSION OF ELASTIC PARAMETERS SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE ELASTIC WAVE THEORY; INVERSE PROBLEM ID DIFFRACTION TOMOGRAPHY; SCATTERING; REFLECTION; DENSITY; WAVES; BORN AB An inversion method that stabilizes the multiparameter inverse problem for a constant background elastic isotropic medium is developed. The inverse problem is formulated in the wavenumber domain and the operators acting on the individual elastic parameters are displayed and analysed. From here it is noticed that for certain scattering angles some parameters produce no scattering. This scattering angle dependence is combined with the frequency dependence of the parameters to reduce the multiparameter inverse problem to a single parameter inversion problem, which is known to yield stable results. The method developed here is an extension of an acoustical medical imaging method by Norton (1983) to the 'elastic seismic imaging problem which inherits limited view constraints. This method is compared to the elastic extension of a multiparameter acoustic inversion method developed by Devaney (1985) and the resulting improvements in stability are demonstrated on synthetic examples. From the theory it is observed that a fixed 90-degrees scattering angle can be used with multiple frequencies to achieve highly stable inversion results of all elastic parameters provided specific elastic parameters are extracted from specific scattering modes. The attempt to extract all elastic parameters from the P-to-P scattering mode using multiple scattering angles is seen to be very ill-conditioned and not recommended. For the 90-degrees scattering angle we find that surface reflection profiling (SRP) and cross-hole geometries have the same wavenumber domain coverage and the multi-offset vertical seismic profiling (MVSP) geometries give a better coverage than only a SRP or cross-hole geometry. C1 UNIV CALIF BERKELEY, DEPT GEOL & GEOPHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP TURA, MAC (reprint author), TUBITAK, DEPT EARTH SCI, PK 21, TR-41470 GEBZE, TURKEY. NR 25 TC 5 Z9 5 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD OCT PY 1993 VL 115 IS 1 BP 1 EP 13 DI 10.1111/j.1365-246X.1993.tb05585.x PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LZ782 UT WOS:A1993LZ78200001 ER PT J AU POIRIER, JP SHANKLAND, TJ AF POIRIER, JP SHANKLAND, TJ TI DISLOCATION MELTING OF IRON AND THE TEMPERATURE OF THE INNER-CORE BOUNDARY, REVISITED SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE DISLOCATION; EARTHS CORE; IRON; MELTING ID EARTHS CORE; HIGH-PRESSURE; PHASE-TRANSITIONS; MANTLE; MODEL; CURVE AB The melting point T(m) of iron at conditions of the Earth's inner core boundary (ICB) has been calculated from the dislocation theory of melting in metals. These calculations take into account the effects of pressure at ICB conditions and of possible freezing point depression resulting from dilution of pure iron in the outer core. Monte Carlo calculations have been used to estimate the uncertainties introduced by uncertainty in the geophysical parameters that are used in the calculations. With this approach T(m) of pure epsilon-Fe at a pressure of 330 GPa and without freezing point depression is 6160+/-250K, and 6110K for a 1000K freezing-point depression, T(m) of pure gamma-Fe is not significantly different; these values agree well with shock-wave determinations of T(m). The estimated temperature of the ICB is lower by the freezing point depression, perhaps by 500-1000K. C1 LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87544. RP POIRIER, JP (reprint author), INST PHYS GLOBE,DEPT GEOMAT,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE. NR 25 TC 26 Z9 26 U1 0 U2 3 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD OCT PY 1993 VL 115 IS 1 BP 147 EP 151 DI 10.1111/j.1365-246X.1993.tb05594.x PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LZ782 UT WOS:A1993LZ78200010 ER EF