FN Thomson Reuters Web of Science™ VR 1.0 PT J AU WOLF, SF LIPSCHUTZ, ME AF WOLF, SF LIPSCHUTZ, ME TI H-CHONDRITE VOLATILE-TRACE-ELEMENT COMPOSITIONAL STRUCTURE SO METEORITICS LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. PURDUE UNIV,W LAFAYETTE,IN 47907. NR 5 TC 1 Z9 1 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD JUL PY 1994 VL 29 IS 4 BP 552 EP 552 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NW884 UT WOS:A1994NW88400232 ER PT J AU CONCUS, P FINN, R AF CONCUS, P FINN, R TI CAPILLARY SURFACES IN A WEDGE - DIFFERING CONTACT ANGLES SO MICROGRAVITY SCIENCE AND TECHNOLOGY LA English DT Article AB The possible zero-gravity equilibrium configurations of capillary surfaces u(x, y) in cylindrical containers whose sections are (wedge) domains with corners are investigated mathematically, for the case in which the contact angles on the two sides of the wedge may differ. In such a situation the behavior can depart in significant qualitative ways from that for which the contact angles on the two sides are the same. Conditions are described under which such qualitative changes must occur. Numerically computed surfaces are depicted to indicate the behavior. C1 UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. STANFORD UNIV,DEPT MATH,STANFORD,CA 94305. RP CONCUS, P (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 14 TC 28 Z9 28 U1 1 U2 1 PU CARL HANSER VERLAG PI MUNICH PA KOLBERGERSTRASSE 22, POSTFACH 860420, W-8163 MUNICH, GERMANY SN 0938-0108 J9 MICROGRAVITY SCI TEC JI Microgravity Sci. Technol. PD JUL PY 1994 VL 7 IS 2 BP 152 EP 155 PG 4 WC Engineering, Aerospace; Thermodynamics; Mechanics SC Engineering; Thermodynamics; Mechanics GA PB218 UT WOS:A1994PB21800015 ER PT J AU MENSAHBINEY, RK REID, KJ HEPWORTH, MT AF MENSAHBINEY, RK REID, KJ HEPWORTH, MT TI KINETICS OF GOLD LOADING FROM BROMIDE SOLUTION ONTO AN ANION-EXCHANGE RESIN SO MINERALS ENGINEERING LA English DT Article AB The kinetics of loading of gold from bromide solution onto an anion exchange resin, PAZ-4, was investigated in a batch stirred reactor. The initial loading rate was described mathematically by a first-order reaction rate equation. The effect of such variables as agitation speed, temperature, resin particle size, resin concentration, initial concentration of gold and bromide in solution on the rate was investigated. The model described fairly accurately the loading process in terms of the varibles investigated. The rate constant for the initial loading ranged from 0.5 to 1.3 x 10(-3) sec-1 and the half-time was 9.3 to 56 minutes. The initial rate constant increased with increasing temperature under the conditions investigated with an activation energy of 15.7 kJ/mole (3.8 kcal/mole). The rate constant was directly proportional to the concentration of the resin in solution. The subsequent reduction reaction was also modeled by the first-order rate equation and the apparent rate constant was estimated to be 3.0 x 10(-6) sec-1 with a half-time of about 44 hours. The loading kinetics involve two major processes: (i) the initial rapid loading dominated by ion exchange-type adsorption, and (ii) the slow electron exchange reduction reaction which becomes dominant only after the completion of the ion exchange process. C1 UNIV MINNESOTA,DEPT CIVIL & MINERAL ENGN,MINNEAPOLIS,MN 55455. RP MENSAHBINEY, RK (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0892-6875 J9 MINER ENG JI Miner. Eng. PD JUL PY 1994 VL 7 IS 7 BP 865 EP 887 DI 10.1016/0892-6875(94)90130-9 PG 23 WC Engineering, Chemical; Mineralogy; Mining & Mineral Processing SC Engineering; Mineralogy; Mining & Mineral Processing GA NQ878 UT WOS:A1994NQ87800003 ER PT J AU LIBERTIN, CR LINGINDECK, L PADILLA, M WOLOSCHAK, GE AF LIBERTIN, CR LINGINDECK, L PADILLA, M WOLOSCHAK, GE TI CYTOKINE AND T-CELL SUBSET ABNORMALITIES IN IMMUNODEFICIENT WASTED MICE SO MOLECULAR IMMUNOLOGY LA English DT Article DE CYTOKINES; IMMUNODEFICIENCY; T-CELL SUBSETS; RADIATION SENSITIVITY; ATAXIA TELANGIECTASIA ID ATAXIA-TELANGIECTASIA; MUTANT MOUSE; IMMUNOLOGICAL ABNORMALITIES; REPAIR-DEFICIENT; ANIMAL-MODEL; EXPRESSION; LIPOPOLYSACCHARIDE; RADIATION; VIRUS; IGA AB Wasted mice bear an autosomal recessive mutation (wst/wst) that manifests itself in neurologic abnormalities, immunologic deficiency, and faulty DNA repair evident by 21 days of age. The immunodeficiency is characterized by a reduction in the thymus-to-body weight ratio, low levels of IgA plasma cells at secretory sites, and increased sensitivity of T-cells to the killing effects of ionizing radiation. Experiments were designed to examine measures of T-cell activity in wasted mice. The initial experiments established that wst/wst mice have percentages of thymic and splenic Thy1(+) cells equivalent to those of control littermates. Further studies of T-cell subpopulations with thymocytes revealed normal percentages of CD4(+) and CD8(+) cells in wst/wst mice; however, double-labeling experiments showed that CD8(+) cells were predominantly CD4(-) in wst/wst mice, whereas in controls most CD8(+) cells also expressed CD4(+). Mesenteric lymph node T-cell subpopulations were similar in wasted and control mice. Because cytokines play a significant role in the regulation of the immune response and also interact with a variety of cellular systems, we examined the expression of different cytokine and related genes (IL1, IL2, IL2R, TNF, IL5, gamma-interferon, beta-TGF) in lymphoid tissues from wasted mice as well as from littermate and parental controls. Studies of RNA from lymphoid tissues of wasted mice using dot blot and Northern blot hybridizations revealed a deficiency of IL5 mRNA in thymus and spleen, decreased expression of IL2R in thymus (but not spleen), increased expression of IL1 in spleen (but not thymus), and increased expression of IL2, gamma-interferon, and beta-TGF in both spleen and thymus, relative to controls. Expression of TNF mRNA in lymphoid tissues was unaffected by the wasted mutation. These results suggest a role for cytokine imbalance in the pathogenesis of the immunodeficiency and other abnormalities of wasted mice. C1 LOYOLA UNIV,MED CTR,DEPT PATHOL,MAYWOOD,IL 60153. LOYOLA UNIV,MED CTR,DEPT MED,MAYWOOD,IL 60153. ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 27 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0161-5890 J9 MOL IMMUNOL JI Mol. Immunol. PD JUL PY 1994 VL 31 IS 10 BP 753 EP 759 DI 10.1016/0161-5890(94)90149-X PG 7 WC Biochemistry & Molecular Biology; Immunology SC Biochemistry & Molecular Biology; Immunology GA NZ054 UT WOS:A1994NZ05400006 PM 8035837 ER PT J AU BOSSERT, JE COTTON, WR AF BOSSERT, JE COTTON, WR TI REGIONAL-SCALE FLOWS IN MOUNTAINOUS TERRAIN .1. A NUMERICAL AND OBSERVATIONAL COMPARISON SO MONTHLY WEATHER REVIEW LA English DT Article ID MESOSCALE CONVECTIVE SYSTEM; SIMULATION; DYNAMICS; COLORADO; FRONT; MODEL AB This study uses observed data and a numerical simulation to examine the generation of thermally driven flows across the Colorado mountain barrier on meso-beta to meso-alpha scales. The observations were collected from remote surface observing systems at exposed mountaintop locations throughout the state of Colorado, over the summers of 1984-88, as part of the Rocky Mountain Peaks Experiment (ROMPEX). The data show the development of a recurrent circulation system across the Colorado mountain barrier, operating on a diurnal timescale. From the observations, the basic structure of the flow system appears as a daytime inflow toward the highest terrain, and a nocturnal outflow away from it. However, when examined in detail, the flow system exhibits more unusual behavior, especially west of the barrier crest. Here, winds in the early evening are occasionally observed to onset abruptly from an easterly direction, generally counter to the upper-level winds. Observations from ROMPEX for 26 August 1985 are used to provide comparison data for a numerical simulation with the Regional Atmospheric Modeling System (RAMS). This three-dimensional case study experiment is initialized with data from the National Meteorological Center and incorporates two-way interactive grid nesting, From the observed data and case study simulation, four distinct phases of the regional-scale circulation system have been identified. In the development phase, a deep mountain-plains solenoid is generated through terrain heating along the Front Range. This circulation system transforms in the late afternoon transition phase into a westward-propagating density current (WPDC). The third phase, called the ''density-current propagation phase,'' occurs as the WPDC moves westward across the mountains, leaving in its wake strong southeasterly flow at the mountaintop level. This current appears to be the cause of the peculiar easterly component winds found in the ROMPEX mountaintop observations along the western slope. In the final late-night adjustment phase, the WPDC dissipates near the western edge of the Colorado mountains and a steady southerly flow evolves over the high mountain terrain. This southerly flow is the steady response to the differential heating that develops between the low-lying plains and the intermountain region. C1 COLORADO STATE UNIV,DEPT ATMOSPHER SCI,FT COLLINS,CO 80523. RP BOSSERT, JE (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,MAIL STOP D401,LOS ALAMOS,NM 87544, USA. NR 46 TC 39 Z9 39 U1 0 U2 5 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD JUL PY 1994 VL 122 IS 7 BP 1449 EP 1471 DI 10.1175/1520-0493(1994)122<1449:RSFIMT>2.0.CO;2 PG 23 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NU466 UT WOS:A1994NU46600004 ER PT J AU BOSSERT, JE COTTON, WR AF BOSSERT, JE COTTON, WR TI REGIONAL-SCALE FLOWS IN MOUNTAINOUS TERRAIN .2. SIMPLIFIED NUMERICAL EXPERIMENTS SO MONTHLY WEATHER REVIEW LA English DT Article ID MESOSCALE CONVECTIVE SYSTEM; BOUNDARY-LAYER EVOLUTION; SEA BREEZE; CIRCULATIONS; SOIL AB A series of two- and three-dimensional idealized numerical experiments are conducted to examine the effects of different physical processes upon the development of the thermally driven regional-scale circulations over mountainous terrain simulated in Part I. The goal of this paper is to understand the conditions that enhance or suppress the formation of a westward-propagating density current within the mountain boundary layer. This current evolves from the Front Range mountain-plain circulation and was found in Part I to be responsible for unusual wind phenomena observed at mountaintop locations during the Rocky Mountain Peaks Experiment over western Colorado. The idealized experiments show that the westward-propagating density current is a robust feature under summertime conditions of weak ambient flow and is initiated by differential heating across the Colorado Front Range between the plains and the intermountain region. In addition, the longevity of the thermally driven circulation system induces a steady southerly flow component, which persists over the intermountain region at night after the density current propagates away. The unique topography of the Colorado Rocky Mountain barrier-which features low plains on the east, a high dividing range, and a high plateau on the west-enhances the development of the current. The westward-propagating disturbance also develops over a range of low-level ambient wind speed, direction, and shear but is suppressed with low-level westerly flow, which also weakens the development of its progenitor, the Front Range mountain-plains solenoid. Low-level stratification affects the depth and strength of the Front Range mountain-plains solenoid, which is most energetic in summertime conditions of near-neutral stability below 50 kPa. High stability in the lower troposphere suppresses the vertical development of the solenoid but increases the baroclinicity across the Front Range generated by surface heating, thereby still producing a significant density-current disturbance. Wet soil over the high terrain west of the Front Range also suppresses the formation and strength of the Front Range solenoid, while wet soil along the eastern slope of the Front Range and eastern plains with drier conditions over the high mountain terrain greatly enhances the baroclinicity within the solenoid and the subsequent density-current evolution. This couplet acts as an efficient conveyer of low-level moisture into the mountain region. C1 COLORADO STATE UNIV,DEPT ATMOSPHER SCI,FT COLLINS,CO 80523. RP BOSSERT, JE (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,MAIL STOP D401,LOS ALAMOS,NM 87545, USA. NR 22 TC 26 Z9 27 U1 0 U2 6 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD JUL PY 1994 VL 122 IS 7 BP 1472 EP 1489 DI 10.1175/1520-0493(1994)122<1472:RSFIMT>2.0.CO;2 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NU466 UT WOS:A1994NU46600005 ER PT J AU MILLER, MK SMITH, GDW AF MILLER, MK SMITH, GDW TI APPLICATIONS OF ATOM-PROBE MICROANALYSIS IN MATERIALS SCIENCE SO MRS BULLETIN LA English DT Article ID SILICON; BOUNDARIES; INTERFACES; OXIDATION; APFIM C1 UNIV OXFORD,DEPT MAT,OXFORD,ENGLAND. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37830, USA. NR 33 TC 5 Z9 5 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUL PY 1994 VL 19 IS 7 BP 27 EP 34 PG 8 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NY417 UT WOS:A1994NY41700004 ER PT J AU KELLOGG, GL TSONG, TT AF KELLOGG, GL TSONG, TT TI ATOMIC-LEVEL STUDIES OF PROCESSES ON METAL-SURFACES SO MRS BULLETIN LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; DISPLACEMENT DISTRIBUTION; EXCHANGE MECHANISM; ACTIVATION-ENERGY; PLATINUM SURFACES; IR(001) SURFACE; CO OXIDATION; IR ATOMS; DIFFUSION; BEHAVIOR C1 ACAD SINICA, INST PHYS, TAIPEI 115, TAIWAN. RP SANDIA NATL LABS, DEPT SURFACE & INTERFACE SCI, ALBUQUERQUE, NM 87185 USA. NR 45 TC 1 Z9 1 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0883-7694 EI 1938-1425 J9 MRS BULL JI MRS Bull. PD JUL PY 1994 VL 19 IS 7 BP 35 EP 40 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NY417 UT WOS:A1994NY41700005 ER PT J AU LAM, NQ OKAMOTO, PR AF LAM, NQ OKAMOTO, PR TI A UNIFIED APPROACH TO SOLID-STATE AMORPHIZATION AND MELTING SO MRS BULLETIN LA English DT Article ID RADIATION-INDUCED AMORPHIZATION; TEMPERATURE SPECIFIC-HEAT; IRRADIATION-INDUCED AMORPHIZATION; CRYSTALLINE-AMORPHOUS TRANSITION; INTERMETALLIC COMPOUNDS; ELECTRON-IRRADIATION; MOLECULAR-DYNAMICS; NI-ZR; GLASS TRANSFORMATION; BRILLOUIN-SCATTERING RP LAM, NQ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 73 TC 60 Z9 64 U1 1 U2 5 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUL PY 1994 VL 19 IS 7 BP 41 EP 46 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NY417 UT WOS:A1994NY41700006 ER PT J AU BUSCH, D GREINER, C ROSENFELD, KL FORD, R DEWIT, J HOEIJMAKERS, JHJ THOMPSON, LH AF BUSCH, D GREINER, C ROSENFELD, KL FORD, R DEWIT, J HOEIJMAKERS, JHJ THOMPSON, LH TI COMPLEMENTATION GROUP ASSIGNMENTS OF MODERATELY UV-SENSITIVE CHO MUTANTS ISOLATED BY LARGE-SCALE SCREENING (FAECB) SO MUTAGENESIS LA English DT Article ID PIGMENTOSUM GROUP-F; DNA-REPAIR; SACCHAROMYCES-CEREVISIAE; IONIZING-RADIATION; ACTIVE GENES; HUMAN-CELLS; MUTATIONS; AGENTS; IDENTIFICATION; FRAMESHIFT AB The complementation group (CG) assignment is presented for 74 moderately sensitive (similar to 2-4x sensitivity of parental line based on ratio of D(10)s) UV-sensitive mutants of Chinese hamster ovary (CHO) cells from the Facility for Automated Experiments in Cell Biology (FAECB) collection. The distribution of mutants within the first five rodent UV CGs was similar to that of previously reported highly sensitive (>4x wild-type UV sensitivity) mutants from this collection. This analysis nearly completes the identification of this large collection of over 200 mutant lines isolated after screening an estimated 3 million total colonies of mutagenized CHO cells from similar to 20 mutant hunts with up to about 400 000 colonies screened. Only eight lines with less than about 2x parental line UV sensitivity remain unassigned. One CG of UV mutants (CG6), which now has five identified representatives in the collection, has only been found among moderately UV-sensitive CHO cells. Mutant UV40, a mitomycin C (MMC)- and X-ray-sensitive line with moderate UV cross-sensitivity, is not in CGs 1-6 and apparently is not a nucleotide excision repair mutant. Also identified were new alleles of CG1 and CG4 mutants with profoundly deficient unscheduled DNA synthesis and moderate UV sensitivity but low sensitivity to MMC. The first CG5 mutant derived from MMC-sensitive MC5 cells has been identified as the second CG5 mutant in the collection. No representatives of rodent CGs 7-11 were found, suggesting that AA8 cells have a chromosomal makeup that precludes easy isolation of mutants in these CGs. The only mutagenesis treatment generating mutants in all of the CGs 1-6 as well as the MMC mutant UV40 was with the frameshift mutagen ICR170. New CGs were not found using mutagen-sensitive derivatives of AA8 (EM9, MC5) in place of wild-type cells, although these parental cell lines did allow the isolation of new double mutant genotypes. C1 ERASMUS UNIV ROTTERDAM,DEPT CELL BIOL & GENET,3015 GE ROTTERDAM,NETHERLANDS. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP BUSCH, D (reprint author), ARMED FORCES INST PATHOL,DEPT ENVIRONM & TOXICOL PATHOL,WASHINGTON,DC 20306, USA. FU NCI NIH HHS [CA04484]; NCRR NIH HHS [RR00961]; NIGMS NIH HHS [GM22021] NR 45 TC 19 Z9 19 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0267-8357 J9 MUTAGENESIS JI Mutagenesis PD JUL PY 1994 VL 9 IS 4 BP 301 EP 306 DI 10.1093/mutage/9.4.301 PG 6 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA NY271 UT WOS:A1994NY27100004 PM 7968570 ER PT J AU SHIGEMATSU, N SCHWARTZ, JL GRDINA, DJ AF SHIGEMATSU, N SCHWARTZ, JL GRDINA, DJ TI PROTECTION AGAINST RADIATION-INDUCED MUTAGENESIS AT THE HPRT LOCUS BY SPERMINE AND N,N''-(DITHIODI-2,1-ETHANEDIYL)BIS-1,3-PROPANEDIAMINE (WR-33278) SO MUTAGENESIS LA English DT Article ID PHOSPHORIBOSYL TRANSFERASE LOCUS; NEUTRON-INDUCED MUTATIONS; STRAND BREAK REPAIR; S-2-(3-AMINOPROPYLAMINO)-ETHYLPHOSPHOROTHIOIC ACID; V79 CELLS; RADIOPROTECTOR WR-2721; EQUILIBRIUM DIALYSIS; DNA; INHIBITION; TOXICITY AB The polyamine spermine and the disulfide N,N''-(dithiodi-2,1-ethanediyl)bis-1 ,3-propanediamine (WR-33278) are structurally similar agents capable of binding to DNA. WR-33278 is the disulfide moiety of the clinically studied radioprotective agent S-2-(3-aminopropylamino)ethylphosphorothioic acid (WR-2721). Because of their reported structural and functional similarities, it was of interest to compare their effects on cell survival and mutation induction at the hypoxanthine-guanine phosphoribosyl transferase (hprt) locus in Chinese hamster AA8 cells. WR-33278 and spermine (at concentrations of 0.01 and 0.001 mM) were electroporated into cells. Electroporation, 300 V and 125 mu F, was performed either 30 min prior to or 3 h following exposure of cells to 750 cGy of ionizing radiation. Electroporation alone reduced cell survival to 75% but had no effect on hprt mutation frequency. The electroporation of either spermine or WR-33278 at concentrations greater than 0.01 mM was extremely toxic. The exposure of cells to both electroporation and irradiation gave rise to enhanced cell killing and mutation induction, with the sequence of irradiation followed 3 h later by electroporation being the more toxic protocol. Cell survival was only enhanced following electroporation of 0.01 mM of spermine and WR-33278 30 min prior to irradiation. Protection against radiation-induced hprt mutations was observed for both spermine and WR-33278 under all experimental conditions tested. Spermine at exposure concentrations of 0.01 and 0.001 mM administered 30 min before or 3 h after irradiation reduced mutation frequencies by factors of 2.2, 1.2, 1.9 and 2.2, respectively. WR-33278 at concentrations of 0.01 and 0.001 mM administered 30 min or 3 h after irradiation with 750 cGy lowered mutation frequencies by factors of 1.8, 1.3, 1.4 and 2.0, respectively. These data suggest that the properties of radioprotection and chemoprevention exhibited by the phosphorothioate (WR-2721) and associated aminothiol WR-1065 and disulfide (WR-33278) metabolites may be mediated in part via endogenous spermine-like polyamine processes (i.e. chromatin stabilization). Such a mechanism would have important implications with respect to the design and development of new generation drugs for use in radioprotection and chemoprevention. C1 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. RP SHIGEMATSU, N (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Shigematsu, Naoyuki/B-9374-2014 FU NCI NIH HHS [CA-37435] NR 39 TC 35 Z9 35 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0267-8357 J9 MUTAGENESIS JI Mutagenesis PD JUL PY 1994 VL 9 IS 4 BP 355 EP 360 DI 10.1093/mutage/9.4.355 PG 6 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA NY271 UT WOS:A1994NY27100012 PM 7968578 ER PT J AU LEHMANN, AR BOOTSMA, D CLARKSON, SG CLEAVER, JE MCALPINE, PJ TANAKA, K THOMPSON, LH WOOD, RD AF LEHMANN, AR BOOTSMA, D CLARKSON, SG CLEAVER, JE MCALPINE, PJ TANAKA, K THOMPSON, LH WOOD, RD TI NOMENCLATURE OF HUMAN DNA-REPAIR GENES SO MUTATION RESEARCH LA English DT Article DE HUMAN DNA REPAIR GENES; NOMENCLATURE ID PIGMENTOSUM GROUP-G; XERODERMA-PIGMENTOSUM; EXCISION-REPAIR; COCKAYNE SYNDROME; COMPLEMENTATION; TRICHOTHIODYSTROPHY; DEFECTS C1 ERASMUS UNIV ROTTERDAM,DEPT CELL BIOL & GENET,3000 DR ROTTERDAM,NETHERLANDS. UNIV GENEVA,MED CTR,DEPT GENET & MICROBIOL,CH-1211 GENEVA 4,SWITZERLAND. UNIV CALIF SAN FRANCISCO,SCH MED,RADIOBIOL LAB,SAN FRANCISCO,CA 94143. UNIV MANITOBA,DEPT HUMAN GENET,WINNIPEG R3E 0W3,MB,CANADA. OSAKA UNIV,INST MOLEC & CELLULAR BIOL,SUITA,OSAKA 565,JAPAN. LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551. IMPERIAL CANC RES FUND,CLARE HALL LABS,POTTERS BAR EN6 3LD,HERTS,ENGLAND. RP LEHMANN, AR (reprint author), UNIV SUSSEX,MRC,CELL MUTAT UNIT,BRIGHTON BN1 9RR,E SUSSEX,ENGLAND. RI Wood, Richard/E-7855-2011 OI Wood, Richard/0000-0002-9495-6892 NR 11 TC 32 Z9 32 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD JUL PY 1994 VL 315 IS 1 BP 41 EP 42 DI 10.1016/0921-8777(94)90026-4 PG 2 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA NV700 UT WOS:A1994NV70000006 PM 7517009 ER PT J AU SMITH, SN JEFFERS, D DEVAY, JE AF SMITH, SN JEFFERS, D DEVAY, JE TI EFFECT OF GLUCOSE AND BIOTIN ON THE GROWTH AND SPORULATION OF FUSARIUM SPECIES, ESPECIALLY PATHOGENIC AND NONPATHOGENIC ISOLATES OF FUSARIUM-OXYSPORUM SO MYCOLOGIA LA English DT Article DE BIOTIN; CULTURAL TYPES; FUSARIUM SPP; GLUCOSE EFFECT; GROWTH; SPORULATION AB Fusarium spp. often initiate growth slowly on high glucose media in the absence of added biotin. Among the isolates of F. oxysporum studied, two types were apparent: low sporulating and high sporulating cultures on agar media. Saprobic isolates of F. oxysporum found in sandy soils usually grew slower than the wilt pathogens from these soils. Within the group of isolates of F. oxysporum formae speciales which cause wilt in host plants, there were two distinct cultural types that were consistently isolated from all infested field soils and from infected plants in each field observed. These two types differed in their degree of sporulation and growth on high glucose agar medium without added biotin; they also could be distinguished based on whether or not they produced a substance easily detected by its odor. RP SMITH, SN (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PLANT PATHOL,DAVIS,CA 95616, USA. NR 12 TC 3 Z9 4 U1 0 U2 1 PU NEW YORK BOTANICAL GARDEN PI BRONX PA PUBLICATIONS DEPT, BRONX, NY 10458 SN 0027-5514 J9 MYCOLOGIA JI Mycologia PD JUL-AUG PY 1994 VL 86 IS 4 BP 547 EP 554 DI 10.2307/3760748 PG 8 WC Mycology SC Mycology GA PH672 UT WOS:A1994PH67200012 ER PT J AU BIEGON, A EBERLING, JL RICHARDSON, BC ROOS, MS WONG, STS REED, BR JAGUST, WJ AF BIEGON, A EBERLING, JL RICHARDSON, BC ROOS, MS WONG, STS REED, BR JAGUST, WJ TI HUMAN CORPUS-CALLOSUM IN AGING AND ALZHEIMERS-DISEASE - A MAGNETIC-RESONANCE-IMAGING STUDY SO NEUROBIOLOGY OF AGING LA English DT Article DE QUANTITATIVE MRI; CORPUS CALLOSUM; AGING; ALZHEIMERS DISEASE; HUMAN BRAIN ID POSITRON EMISSION TOMOGRAPHY; DEMENTIA; BRAIN; SCHIZOPHRENIA AB The involvement of the corpus callosum in aging and Alzheimer's disease (AD) is not clear. We measured cross sectional areas of the entire corpus callosum (CC), as well as the front 20% (genu), middle 60% (body), and posterior 20% (splenium) of the structure from a midsagittal MRI slice in AD patients (N = 20), and young (N = 16) and old (N = 13) control subjects. We found that mean CC area in young controls was 570 +/- 107 mm(2). Aging did not significantly affect the mean area of the CC (562 +/- 98 mm(2)). A small, significant reduction was seen in AD in comparison to the young control group (480 +/- 133 mm(2)). However, AD is accompanied by a large and statistically significant reduction in the genu area in comparison to both young and old control subjects. A trend toward an age-dependent reduction in the body area is also accentuated in AD patients who showed significantly smaller callosal bodies than young controls. We conclude that selective changes within the corpus callosum accompany aging and AD pathology. C1 LAWRENCE BERKELEY LAB,CTR FUNCT IMAGING,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT NEUROL,DAVIS,CA 95616. FU NIA NIH HHS [R01 AG07793, P30AG10129] NR 25 TC 70 Z9 73 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0197-4580 J9 NEUROBIOL AGING JI Neurobiol. Aging PD JUL-AUG PY 1994 VL 15 IS 4 BP 393 EP 397 DI 10.1016/0197-4580(94)90070-1 PG 5 WC Geriatrics & Gerontology; Neurosciences SC Geriatrics & Gerontology; Neurosciences & Neurology GA NW475 UT WOS:A1994NW47500001 PM 7969715 ER PT J AU HODGE, SA PETEK, M AF HODGE, SA PETEK, M TI ASSESSMENT OF 2 BWR ACCIDENT MANAGEMENT STRATEGIES SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Candidate mitigative strategies for the management of in-vessel events during the late phase (after-core degradation has occurred) of postulated boiling water reactor (BWR) severe accidents were considered at Oak Ridge National Laboratory (ORNL) during 1990. The identification of new strategies was subject to the constraint that they should, to the maximum extent possible, make use of the existing equipment and water resources of the BWR facilities, and not require major equipment modifications or additions. As a result of this effort, two of these candidate strategies were recommended for further assessment. The first was a strategy for containment flooding to maintain the core and structural debris within the reactor vessel in the event that vessel injection cannot be restored to terminate a severe accident sequence. The second strategy pertained to the opposite case, for which vessel injection would be restored after control blade melting had begun; its purpose was to provide an injection source of borated water at the concentration necessary to preclude criticality upon recovering a damaged BWR core. Assessments of these two strategies were performed during 1991 and this paper provides a discussion of the motivation for and purpose of these strategies, and the potential for their success. RP HODGE, SA (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 32 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 JUL PY 1994 VL 148 IS 2-3 BP 185 EP 203 DI 10.1016/0029-5493(94)90109-0 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800006 ER PT J AU HANSON, DJ ARCIERI, WC WARD, LW AF HANSON, DJ ARCIERI, WC WARD, LW TI ASSESSING INFORMATION NEEDS AND INSTRUMENT AVAILABILITY FOR A PRESSURIZED-WATER REACTOR DURING SEVERE ACCIDENTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB A five-step methodology was developed to evaluate information needs for nuclear power plants under accident conditions and the availability of plant instrumentation during severe accidents. Step 1 examines the credible accidents and their relationships to plant safety functions. Step 2 determines the information that personnel involved in accident management will need to understand plant behavior. Step 3 determines the capability of the instrumentation to function properly under severe accident conditions. Step 4 determines the conditions expected during the identified severe accidents. Step 5 compares the instrument capabilities and severe accident conditions, to evaluate the availability of the instrumentation to supply needed plant information. This methodology was applied to a pressurized water reactor with a large dry containment and the results are presented. A companion article describes application of the methodology to a boiling water reactor with a Mark I containment. RP HANSON, DJ (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 11 TC 0 Z9 0 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 JUL PY 1994 VL 148 IS 2-3 BP 233 EP 252 DI 10.1016/0029-5493(94)90112-0 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800009 ER PT J AU OLANDER, DR AF OLANDER, DR TI MATERIALS CHEMISTRY AND TRANSPORT MODELING FOR SEVERE ACCIDENT ANALYSES IN LIGHT-WATER REACTORS .1. EXTERNAL CLADDING OXIDATION SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID ZIRCALOY OXIDATION; OXYGEN DIFFUSION; STEAM AB High temperature Zircaloy oxidation in the flowing steam-H, environment of a severe fuel damage accident is analysed by integral diffusion theory. This approach provides details on the state of the cladding as a function of the time and elevation, with accuracy not attainable using conventional parabolic oxidation rate laws. The method is compatible with the nodal techniques used in large accident codes, in which the system is governed by coupled ordinary differential equations. It provides the state of the cladding (i.e. all metal, all oxide, or oxide plus metal) at any combination of time and elevation. Steam depletion of the bulk gas and the concentration difference across the mass transfer boundary layer results in incomplete oxidation of the cladding in the upper part of the fuel element. The first consequence of steam starvation is dissolution of the oxide scale into the remaining metal. Steam starvation occurs readily when the steam supply rate is low and the temperature excursion is fast. When these conditions exist, the cladding reaches its melting point without an external ZrO2 scale. With high steaming rates and slow heat-up rates, steam starvation does not occur and the cladding can be entirely converted to the oxide. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP OLANDER, DR (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 24 TC 22 Z9 23 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 JUL PY 1994 VL 148 IS 2-3 BP 253 EP 271 DI 10.1016/0029-5493(94)90113-9 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800010 ER PT J AU OLANDER, DR AF OLANDER, DR TI MATERIALS CHEMISTRY AND TRANSPORT MODELING FOR SEVERE ACCIDENT ANALYSES IN LIGHT-WATER REACTORS .2. GAP PROCESSES AND HEAT RELEASE SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID HYDROGEN AB Several consequences of steam starvation of the gas filling the internals of the core of a light-water reactor in the fuel-uncovery phase of a severe accident up to cladding melting are analysed. Emphasis is placed on processes that occur in the H-2-rich gas external to the fuel rod cladding; absorption of oxygen and hydrogen by the cladding; the composition and flow rates of gas in the fuel-cladding gap; and the response of the fuel to these conditions. The transport processes and chemical reactions in the cladding, and the fuel controlled by the behavior of the gas in the gap are modeled for a simple temperature transient characteristic of a severe fuel damage accident in a light-water reactor. Cladding burst is assumed to occur at 1273 K at the midplane elevation of the fuel rod, permitting the gas in the gap to come into contact with that external to the fuel rod. The results of the analysis include the following. Steam ingress is restricted to a few centimeters from the failure site by the gettering action of the metal-water reaction on the cladding inner wall. Hydrogen moves axially into the gap only a few times further than steam by diffusion in the Xe-He mixture. The chief process restricting H-2 ingress is the backflow resulting from thermal expansion of the gas in the fuel rod as the temperature rises. When the protective ZrO2 scale on the outer surface of the cladding disappears by dissolution in the metal, hydrogen permeation through the cladding wall rapidly replaces the inert gas in the gap with H-2. Hydrogen uptake by the cladding draws gas into the core region from the upper plenum and augments the heat release by the metal-water reaction. Exposure of the fuel to this H-2-rich gas results in minor fuel reduction and accompanying cladding oxidation. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP OLANDER, DR (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 29 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUL PY 1994 VL 148 IS 2-3 BP 273 EP 292 DI 10.1016/0029-5493(94)90114-7 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800011 ER PT J AU PASAMEHMETOGLU, KO UNAL, C AF PASAMEHMETOGLU, KO UNAL, C TI HEAT-TRANSFER FROM A HIGH-TEMPERATURE SAFETY ROD PLACED IN A PERFORATED GUIDE TUBE AND SURROUNDED BY AN ARRAY OF COLD TUBES SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB In this paper, a simple natural convection heat-transfer model for a safety rod placed in a perforated guide tube is proposed. The geometry is typical of the Savannah River K reactor. The proposed model for the rod and the perforated guide-tube assembly is benchmarked against prototypical lest data obtained by Idaho National Engineering Laboratory. The results showed that the proposed model was in good agreement with the experimental data except at very high temperatures where the model slightly underpredicted the rod and tube temperatures. By evaluating the thermal conductivity of the fluid (air) at the wall temperature, the prediction of the high temperature natural convection data was further improved. RP PASAMEHMETOGLU, KO (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 1 Z9 1 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 JUL PY 1994 VL 148 IS 2-3 BP 293 EP 304 DI 10.1016/0029-5493(94)90115-5 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800012 ER PT J AU GREENE, GA CHO, DH HYDER, ML ALLISON, DK ELLISON, PG AF GREENE, GA CHO, DH HYDER, ML ALLISON, DK ELLISON, PG TI RAPID QUENCHING OF MOLTEN LITHIUM ALUMINUM JETS IN WATER SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The behavior of melted lithium-aluminum control rod material from the Savannah River K reactor, when contacted with water, was observed experimentally at a scale corresponding to hypothesized accident conditions. Although pressure pulses of up to 124 kPa were observed, and water and steam were vigorously expelled from the experimental apparatus, no steam explosion occurred. A number of experiments were performed, in which accident phenomena that might initiate a steam explosion were simulated, without effect. Some chemical reaction was observed, indicating that hydrogen was produced. These experiments were used to establish the safety of reactor operation in a recent campaign. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. WESTINGHOUSE SAVANNAH RIVER CO,AIKEN,SC. IDAHO NATL ENGN LAB,IDAHO,ID. RP GREENE, GA (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 4 TC 5 Z9 5 U1 0 U2 3 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 JUL PY 1994 VL 148 IS 2-3 BP 317 EP 326 DI 10.1016/0029-5493(94)90117-1 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800014 ER PT J AU REMPE, JL WALKER, TJ AF REMPE, JL WALKER, TJ TI OVERVIEW OF NRC SPONSORED LWR LOWER HEAD FAILURE RESEARCH-PROGRAM SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The US Nuclear Regulatory Commission (US NRC) has sponsored a research program to investigate the mode and timing of vessel lower head failure. Major objectives of the program were to identify plausible failure mechanisms and to develop a method for determining which failure mode would occur first for different light water reactor designs and accident conditions. Failure mechanisms, such as tube ejection, tube rupture, global vessel failure, and localized vessel creep rupture, were studied. Newly developed models and existing models were applied to predict which failure mechanism would occur first in various severe accident scenarios. So that a broader range of conditions could be considered simultaneously, the calculations relied heavily on models with closed-form or simplified numerical solution techniques. Finite element techniques were employed for analytical model verification and examination of more detailed phenomena. High-temperature creep and tensile data were obtained for predicting the vessel and penetration structural response. This paper summarizes major accomplishments and conclusions from research performed in the NRC sponsored lower head failure project. C1 US NUCL REGULATORY COMMISS,OFF NUCL REGULATORY RES,ACCID EVALUAT BRANCH,WASHINGTON,DC 20555. RP REMPE, JL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Rempe, Joy/0000-0001-5527-3549 NR 16 TC 1 Z9 1 U1 0 U2 3 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 JUL PY 1994 VL 148 IS 2-3 BP 327 EP 341 DI 10.1016/0029-5493(94)90118-X PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800015 ER PT J AU THINNES, GL KORTH, GE CHAVEZ, SA WALKER, TJ AF THINNES, GL KORTH, GE CHAVEZ, SA WALKER, TJ TI HIGH-TEMPERATURE CREEP AND TENSILE DATA FOR PRESSURE-VESSEL STEELS SA533B1 AND SA508-CL2 SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Steel materials, SA533B1 and SA508CL-2, are widely used in the construction of commercial reactor pressure vessel lower heads. Previously, knowledge of the high temperature structural properties of SA533B1 was limited to temperatures below 922 K. In support of severe accident condition analyses, tensile and creep tests in the temperature range 900-1473 K were performed at the Idaho National Engineering Laboratory (INEL) under the US Nuclear Regulatory Commission Lower Head Failure Analysis Program. These creep and tensile test data are discussed and compared with previously developed lower temperature data for SA533B1 material. There is also additional discussion of SA508CL-2 creep data previously developed at the INEL. C1 US NUCL REGULATORY COMMISS,OFF NUCL REGULATORY RES,WASHINGTON,DC 20555. RP THINNES, GL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 10 TC 8 Z9 11 U1 0 U2 5 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 JUL PY 1994 VL 148 IS 2-3 BP 343 EP 350 DI 10.1016/0029-5493(94)90119-8 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800016 ER PT J AU CHAVEZ, SA KORTH, GE HARPER, DM WALKER, TJ AF CHAVEZ, SA KORTH, GE HARPER, DM WALKER, TJ TI HIGH-TEMPERATURE TENSILE AND CREEP DATA FOR INCONEL-600,304 STAINLESS-STEEL AND SA106B CARBON-STEEL SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB We report results from high temperature tensile and creep tests performed on Inconel 600, 304 stainless steel and SA106B carbon steel, materials used to construct components which penetrate the lower heads of reactor vessels. Testing temperatures for the Inconel and stainless and carbon steels exceeded 1360 K, 1350 K and 1040 K, respectively. These data are applicable, but not limited, to severe accident analysis. C1 OFF NUCL REGULATORY RES,ACCID EVALUAT BRANCH,WASHINGTON,DC 20555. RP CHAVEZ, SA (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 16 TC 12 Z9 12 U1 1 U2 2 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 JUL PY 1994 VL 148 IS 2-3 BP 351 EP 363 DI 10.1016/0029-5493(94)90120-1 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800017 ER PT J AU REMPE, JL THINNES, GL CHAVEZ, SA AF REMPE, JL THINNES, GL CHAVEZ, SA TI A SIMPLER APPROACH FOR PREDICTING LWR VESSEL FAILURE DURING SEVERE ACCIDENT CONDITIONS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Using closed-form solution techniques, models were developed for assessing the thermal and structural response of light water reactor (LWR) vessels and penetrations during severe accident conditions. Results from models are displayed as failure maps, generally developed in terms of non-dimensional groups, so that a broader range of reactor design parameters and severe accident conditions can be considered. In this paper, failure maps are used to compare LWR vessel response to three accident conditions. Results discussed within this paper illustrate the importance of vessel and tube geometrical parameters and material properties for predicting which vessel failure mode occurs first. RP REMPE, JL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Rempe, Joy/0000-0001-5527-3549 NR 19 TC 0 Z9 0 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 JUL PY 1994 VL 148 IS 2-3 BP 365 EP 383 DI 10.1016/0029-5493(94)90121-X PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800018 ER PT J AU CHAVEZ, SA REMPE, JL AF CHAVEZ, SA REMPE, JL TI FINITE-ELEMENT ANALYSES OF A BWR VESSEL AND PENETRATION UNDER SEVERE ACCIDENT CONDITIONS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This study assesses the two-dimensional thermal response of a BWR vessel and drain line penetration to three types of debris bed: primarily metallic, primarily ceramic and metallic and ceramic layered, with sensitivity studies for the most severe case. Structural finite element analysis evaluates vessel elastic, plastic and creep response for two cases which bound the thermal challenge to the vessel. Thermal analysis results indicate that drain line failure does not occur for the case when metallic debris relocates to the lower head; structural analysis predicts that the vessel also remains intact for this case. In cases where ceramic debris relocates to the lower head, drain line temperatures peak near values where failure may occur within several minutes; whereas vessel failure is not predicted for 3.5 to 4.0 hours. Sensitivity studies indicate that large porosity debris or high heat removal rates from the vessel and drain line outer surfaces can preclude failure temperatures from occurring. RP CHAVEZ, SA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Rempe, Joy/0000-0001-5527-3549 NR 25 TC 5 Z9 5 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 JUL PY 1994 VL 148 IS 2-3 BP 413 EP 435 DI 10.1016/0029-5493(94)90123-6 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NY938 UT WOS:A1994NY93800020 ER PT J AU AZARM, MA AF AZARM, MA TI TAKE 5 FOR SCREENING SO NUCLEAR ENGINEERING INTERNATIONAL LA English DT Article RP AZARM, MA (reprint author), BROOKHAVEN NATL LAB,POB 5000,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU REED BUSINESS PUBLISHING LTD PI SUTTON PA QUADRANT HOUSE THE QUADRANT, SUTTON, SURREY, ENGLAND SM2 5AS SN 0029-5507 J9 NUCL ENG INT JI Nucl. Eng. Int. PD JUL PY 1994 VL 39 IS 480 BP 47 EP 47 PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NV683 UT WOS:A1994NV68300016 ER PT J AU ARUNASALAM, V GREENE, GJ YOUNG, KM AF ARUNASALAM, V GREENE, GJ YOUNG, KM TI ION-CYCLOTRON AND SPIN-FLIP EMISSIONS FROM FUSION PRODUCTS IN TOKAMAKS SO NUCLEAR FUSION LA English DT Article ID BERNSTEIN WAVES; QUASILINEAR THEORY; PLASMAS; RESONANCE; TEMPERATURE; INSTABILITY; RADIATION; FREQUENCY; JET; SCATTERING AB Power emission by fusion products (i.e. protons and/or alpha particles) of tokamak plasmas in their ion cyclotron range of frequencies (ICRF) and at their spin-flip resonance frequency is calculated for some specific model fusion product velocity space distribution functions. Single 'dressed' test particle spontaneous emission calculations are presented first and the radiation temperature for ion cyclotron emission (ICE) is analysed both for black body emission and non-equilibrium conditions. Thresholds for instability and overstability (i.e. negative radiation temperature) conditions are then examined and quasi-linear and non-linear theories of the electromagnetic ion cyclotron modes are discussed. Some numerical estimates are presented for typical tokamak parameters. Semiquantitative remarks are offered on wave accessibility, mode conversion and parametric decay instabilities as possible mechanisms for spatially localized ICE. Calculations are carried out both for k(parallel-to) = 0 and for k(parallel-to) not-equal 0. The effects of the temperature anisotropy (i.e. T(perpendicular-to) not-equal T(parallel-to)) and large drift velocities in the parallel direction are also examined. Finally, proton spin-flip resonance emission and absorption calculations are also presented both for thermal equilibrium conditions and for an 'inverted' population of states. Reasonably good agreement is obtained between theory and experiment. Distinctions between 'kinetic or causal instabilities' and 'hydrodynamic instabilities' are drawn in the Appendix. RP ARUNASALAM, V (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 113 TC 8 Z9 8 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 JUL PY 1994 VL 34 IS 7 BP 927 EP 961 DI 10.1088/0029-5515/34/7/I03 PG 35 WC Physics, Fluids & Plasmas SC Physics GA PH689 UT WOS:A1994PH68900003 ER PT J AU STRACHAN, JD AF STRACHAN, JD TI STUDIES OF GLOBAL ENERGY CONFINEMENT IN TFTR SUPERSHOTS SO NUCLEAR FUSION LA English DT Article ID PLASMAS AB The global energy confinement time, tau(E), from TFTR supershot plasmas has been correlated with the hydrogen recycling and the pressure anisotropy. An expression for the global confinement is obtained that describes its value at the time of peak neutron emission for all TFTR supershots obtained in the 1990 campaign, and simultaneously describes the time evolution of tau(E) for an extensive subset of the 1990 data. The obtained expression is probably not unique and it can be written with different variables. An analysis of the energy balance for many of these supershots indicates that the primary effect of larger tau(E) is that the central particle diffusivity is lower. RP STRACHAN, JD (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 15 TC 16 Z9 16 U1 0 U2 3 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 JUL PY 1994 VL 34 IS 7 BP 1017 EP 1038 DI 10.1088/0029-5515/34/7/I07 PG 22 WC Physics, Fluids & Plasmas SC Physics GA PH689 UT WOS:A1994PH68900007 ER PT J AU MORI, M ISHIDA, S ANDO, T ANNOH, K ASAKURA, N AZUMI, M VANBLOKLAND, AAE FRIELING, GJ FUJII, T FUJITA, T FUKUDA, T FUNAHASHI, A HATAE, T HOEK, M HONDA, M HOSOGANE, N ISEI, N ITAMI, K KAMADA, Y KAWANO, Y KIKUCHI, M KIMURA, H KIMURA, T KISHIMOTO, H KITSUNEZAKI, A KODAMA, K KOIDE, Y KONDOH, T KUBO, H KURIYAMA, M MATSUOKA, M MATSUZAKI, Y MIYA, N NAGAMI, M NAGASHIMA, A NAITO, O NAKAMURA, H NEMOTO, M NEYATANI, Y NINOMIYA, H NISHITANI, T OHGA, T OHMORI, S SAIDOH, M SAKASAI, A SATO, M SHIMADA, M SHIMIZU, K SHIRAI, H SUGIE, T TAKEUCHI, H TANI, K TOBITA, K TSUJI, S USHIGUSA, K YAMADA, M YONEKAWA, I YOSHIDA, H YOSHINO, R AF MORI, M ISHIDA, S ANDO, T ANNOH, K ASAKURA, N AZUMI, M VANBLOKLAND, AAE FRIELING, GJ FUJII, T FUJITA, T FUKUDA, T FUNAHASHI, A HATAE, T HOEK, M HONDA, M HOSOGANE, N ISEI, N ITAMI, K KAMADA, Y KAWANO, Y KIKUCHI, M KIMURA, H KIMURA, T KISHIMOTO, H KITSUNEZAKI, A KODAMA, K KOIDE, Y KONDOH, T KUBO, H KURIYAMA, M MATSUOKA, M MATSUZAKI, Y MIYA, N NAGAMI, M NAGASHIMA, A NAITO, O NAKAMURA, H NEMOTO, M NEYATANI, Y NINOMIYA, H NISHITANI, T OHGA, T OHMORI, S SAIDOH, M SAKASAI, A SATO, M SHIMADA, M SHIMIZU, K SHIRAI, H SUGIE, T TAKEUCHI, H TANI, K TOBITA, K TSUJI, S USHIGUSA, K YAMADA, M YONEKAWA, I YOSHIDA, H YOSHINO, R TI ACHIEVEMENT OF HIGH FUSION TRIPLE PRODUCT IN THE JT-60U HIGH BETA(P) H MODE SO NUCLEAR FUSION LA English DT Letter ID TOKAMAK; CONFINEMENT; REACTOR AB Improvement of an enhanced confinement state in a high poloidal beta (beta(p)) regime without sawtooth activity has been achieved in JT-60U. A confinement mode has been demonstrated where both the edge and the core confinement are improved. The attainable beta(p) was also extended to higher values in this improved mode, because of its broader pressure profile. As a result of the improvement in confinement and in attainable beta(p), the highest value of the fusion triple product has been extended by a factor of 2.5 over that achieved in the 1992 experiments; it has reached (1.1 +/- 0.3) x 10(21) m-3.s.keV with a central ion temperature of about 37 keV. The D-D neutron emission rate has also been doubled in these experiments and has reached (5.6 +/- 0.6) x 10(16) s-1. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ. RP MORI, M (reprint author), JAPAN ATOM ENERGY RES INST,NAKA FUS RES ESTAB,NAKA,IBARAKI,JAPAN. RI Yamada, Masaaki/D-7824-2015; Kikuchi, Mitsuru/O-1036-2015; ISHIDA, SHINICHI/E-7046-2017 OI Yamada, Masaaki/0000-0003-4996-1649; Kikuchi, Mitsuru/0000-0002-5485-8737; NR 20 TC 29 Z9 29 U1 2 U2 3 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 JUL PY 1994 VL 34 IS 7 BP 1045 EP 1053 DI 10.1088/0029-5515/34/7/I09 PG 9 WC Physics, Fluids & Plasmas SC Physics GA PH689 UT WOS:A1994PH68900009 ER PT J AU HERSHCOVITCH, AI ALESSI, JG KPONOU, AE AF HERSHCOVITCH, AI ALESSI, JG KPONOU, AE TI GAS LIMITATIONS ON THE PERFORMANCE OF A NEW POLARIZED NEGATIVE-ION SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID HYDROGEN BEAM; CROSS-SECTION AB A new ground state source of negative hydrogen ions with polarized nuclei (H over arrow pointing right -) has been studied at BNL. Extensive developmental research has been aimed at improving each element of H over arrow pointing right - production: cold H0 beam, spin selection and focusing magnets, and ionizer. These elements have recently been integrated into a source. The performance of each individual element was extremely encouraging. However, larger than expected gas scattering problems arose as elements were being combined. These scattering problems suggest that improvements to ground state polarized sources by cooling the atomic beam may have reached a regime of diminishing returns. RP HERSHCOVITCH, AI (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 23 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1994 VL 345 IS 3 BP 411 EP 416 DI 10.1016/0168-9002(94)90491-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100002 ER PT J AU LINCOLN, D MORROW, G KASPER, P AF LINCOLN, D MORROW, G KASPER, P TI A HIDDEN BIAS IN A COMMON CALORIMETER CALIBRATION SCHEME SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PERFORMANCE; MODULE AB In this paper, a common calorimeter calibration scheme is explored and a hidden bias found. Since this bias mimics a non-linearity in response in the calorimeter, it must be understood and removed from the calibration before true non-linearities are investigated. The effect and its removal are explored and understood through straightforward calculus and algebra. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RICE UNIV,DEPT PHYS,TW BONNER NUCL LAB,HOUSTON,TX 77251. NR 11 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1994 VL 345 IS 3 BP 449 EP 452 DI 10.1016/0168-9002(94)90497-9 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100008 ER PT J AU WUOSMAA, AH WILT, P BACK, BB BETTS, RR FREER, M GLAGOLA, BG HAPP, T HENDERSON, DJ BEARDEN, IG ZURMUHLE, RW BALAMUTH, DP BARROW, S BENTON, D LI, Q LIU, Z MIAO, Y AF WUOSMAA, AH WILT, P BACK, BB BETTS, RR FREER, M GLAGOLA, BG HAPP, T HENDERSON, DJ BEARDEN, IG ZURMUHLE, RW BALAMUTH, DP BARROW, S BENTON, D LI, Q LIU, Z MIAO, Y TI INSTRUMENTATION OF DOUBLE-SIDED SILICON STRIP DETECTORS FOR MULTIPARTICLE DETECTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CHARGED-PARTICLE; SYSTEM; ARRAY AB A compact, modular, low-cost, high-density readout system for double-sided silicon strip detectors (DSSD) has been developed. The system, composed of a customized high-density, multi-channel preamplifier unit combined with commercial CAMAC modules, provides for the individual readout of each of the 32 segments in a 16 x 16 crossed-strip DSSD. This system permits X - Y position sensitivity to be achieved for multiple-particle events, making double-sided silicon strip detectors powerful tools for the study of nuclear reactions leading to many-charged-particle final states. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP WUOSMAA, AH (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Freer, Martin/F-9379-2013; Bearden, Ian/M-4504-2014 OI Bearden, Ian/0000-0003-2784-3094 NR 13 TC 14 Z9 14 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1994 VL 345 IS 3 BP 482 EP 491 DI 10.1016/0168-9002(94)90503-7 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100013 ER PT J AU LEGROS, M SILVER, E MADDEN, N BEEMAN, J GOULDING, F LANDIS, D HALLER, E AF LEGROS, M SILVER, E MADDEN, N BEEMAN, J GOULDING, F LANDIS, D HALLER, E TI MICROCALORIMETERS FOR BROAD-BAND HIGH-RESOLUTION X-RAY SPECTRAL-ANALYSIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A large area microcalorimeter with 95% quantum efficiency at 6 keV has been developed. When fully illuminated, it produces X-ray spectra between 0.5 and 7 keV with an energy resolution of 23 eV. On a smaller, but similar detector, we measure 18 eV. The resolution is obtained at input count rates of 10-50 Hz in real-time with analog pulse processing and thermal pile-up rejection. The detector is incorporated into a compact and portable cryogenic refrigerator system that is ready for use as a tool for analytical spectroscopy. C1 LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,POB 808,LIVERMORE,CA 94550. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 6 TC 6 Z9 6 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 JUL 1 PY 1994 VL 345 IS 3 BP 492 EP 495 DI 10.1016/0168-9002(94)90504-5 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100014 ER PT J AU DAVIDS, CN AF DAVIDS, CN TI COMPUTER CONTROL OF THE FRAGMENT MASS ANALYZER AT ATLAS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A control system for the Fragment Mass Analyzer is described, running on a Macintosh computer and using CAMAC hardware interfaces. The computer is used inside a feedback loop for control of the magnetic fields, with field strengths measured by Hall probes. High-voltage conditioning of the electric dipoles is done under computer control. Targets and detectors are positioned using stepping motors controlled by the computer, and vacuum conditions are also monitored. RP DAVIDS, CN (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 7 TC 6 Z9 6 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 JUL 1 PY 1994 VL 345 IS 3 BP 528 EP 533 DI 10.1016/0168-9002(94)90511-8 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100021 ER PT J AU KOZHEVNIKOV, IV FEDORENKO, AI KONDRATENKO, VV PERSHIN, YP YULIN, SA ZUBAREV, EN PADMORE, HA CHEUNG, KC VANDORSSEN, GE ROPER, M BALAKIREVA, LL SEROV, RV VINOGRADOV, AV AF KOZHEVNIKOV, IV FEDORENKO, AI KONDRATENKO, VV PERSHIN, YP YULIN, SA ZUBAREV, EN PADMORE, HA CHEUNG, KC VANDORSSEN, GE ROPER, M BALAKIREVA, LL SEROV, RV VINOGRADOV, AV TI SYNTHESIS AND MEASUREMENT OF NORMAL INCIDENCE X-RAY MULTILAYER MIRRORS OPTIMIZED FOR A PHOTON ENERGY OF 390 EV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID OPTICS AB The problems inherent in the fabrication of short period multilayer mirrors are discussed and results of the synthesis of multilayer structures with nanometer period are presented. The shortest period observed is 13 angstrom for W-Si and W-B4C sputtered multilayers. Measurements of near normal incidence reflectivity at lambda = 31-32 angstrom are presented for W-Sc multilayers with a period approximately 16 angstrom. The measured reflectivity reaches a maximum of 3.3% and is in good agreement with theoretical modeling after the inclusion of interfacial roughness. C1 KHARKOV POLYTECH INST,KHARKOV,UKRAINE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. RP KOZHEVNIKOV, IV (reprint author), PN LEBEDEV PHYS INST,LENINSKY PROSPECT 53,MOSCOW,RUSSIA. RI Vinogradov, Alexander/M-5331-2015 NR 47 TC 24 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1994 VL 345 IS 3 BP 594 EP 603 DI 10.1016/0168-9002(94)90520-7 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100030 ER PT J AU LEE, EM MAJKRZAK, CF ELMIGER, M PASSELL, L AF LEE, EM MAJKRZAK, CF ELMIGER, M PASSELL, L TI THE BROOKHAVEN NEUTRON REFLECTION SPECTROMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID AIR-WATER-INTERFACE; SPECULAR REFLECTION; SPREAD MONOLAYERS; LAYER; SURFACTANTS; ADSORPTION AB Design of a neutron reflection spectrometer built to investigate liquid/solid, liquid/vapour, and solid/vapour interfaces is described. A brief discussion of the neutron optics relevant to reflection spectrometry is also presented. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP LEE, EM (reprint author), PHYS CHEM LAB,S PARKS RD,OXFORD OX1 3QZ,ENGLAND. NR 17 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1994 VL 93 IS 1 BP 75 EP 81 DI 10.1016/0168-583X(94)95459-3 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NX623 UT WOS:A1994NX62300011 ER PT J AU XIE, R PETKOV, M BECKER, D CANTER, K JACOBSEN, FM LYNN, KG MILLS, R ROELLIG, LO AF XIE, R PETKOV, M BECKER, D CANTER, K JACOBSEN, FM LYNN, KG MILLS, R ROELLIG, LO TI PRODUCTION OF A LOW-ENERGY POSITRON BEAM USING THE C-12(D,N)N-13 REACTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID REEMISSION MICROSCOPE AB A prototype magnetic positron beam was built in order to study the feasibility of using low energy (almost-equal-to 1-2 MeV) deuteron accelerators to produce moderate-intensity (almost-equal-to 10(7)-10(8) e+/s) monoenergetic low energy positron beams. Graphite and diamond targets were bombarded with a few muA of deuterons at energies of 0.9, 1.3 and 1.8 MeV to produce the short lived N-13 beta+ emitter. The results show that the peak beta+ activity per 1 muA of deuteron irradiation is about 1 mCi. When combined with a standard positron moderator, this method of producing low energy positrons is expected to be capable of yielding a beam of up to 10(8) e+/s. C1 BROOKHAVEN NATL LAB,DEPT APPL PHYS,UPTON,NY 11973. BRANDEIS UNIV,DEPT PHYS,WALTHAM,MA 02254. CUNY,DEPT PHYS,NEW YORK,NY 10031. NR 17 TC 15 Z9 15 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 JUL PY 1994 VL 93 IS 1 BP 98 EP 102 DI 10.1016/0168-583X(94)95463-1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NX623 UT WOS:A1994NX62300015 ER PT J AU DORADO, JJ CRAWFORD, OH FLORES, F AF DORADO, JJ CRAWFORD, OH FLORES, F TI THE NONLINEAR WAKE IN A HYDRODYNAMICAL MODEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID STOPPING POWER; Z(1)(3) CORRECTION; ENERGY-LOSS; MATTER; IONS AB A hydrodynamical model is used to calculate the non-linear wake and stopping power of a moving charge, Z, in an electron ps for intermediate and high velocities (upsilon greater-than-or-qual-to 1.5upsilon(B)). In this work, the non-linear hydrodynamic equations for the induced density in the electron ps are expanded in a perturbation series in powers of the nuclear charge, Z, and solved to second order in Z. Results for the induced second-order potential and the Z3-stopping power are given for an electron ps simulating aluminum. C1 OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831. RP DORADO, JJ (reprint author), UNIV AUTONOMA MADRID,FAC CIENCIAS,DEPT FIS MAT CONDENSADA C-XII,E-28049 MADRID,SPAIN. RI Flores, fernando/K-2362-2014 NR 21 TC 21 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1994 VL 93 IS 2 BP 175 EP 180 DI 10.1016/0168-583X(94)95684-7 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NY444 UT WOS:A1994NY44400012 ER PT J AU STEVENSON, ML AF STEVENSON, ML TI THE BERKELEY PROGRAM SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 19 EP 36 PG 18 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700004 ER PT J AU FOWLER, WB AF FOWLER, WB TI AMERICAN CHAMBERS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC AB Following the discovery of the bubble chamber by Don Glaser, there was immediate recognition by many American high energy physics research groups of the great potential for improved experimentation using bubble chambers. This paper traces the American effort, attempting to include the significant steps (leaving out the Alvarez group's contribution) that lead to the dominance of the bubble chamber technique for high energy physics research for many years. C1 FERMILAB NATL ACCELERATOR LAB,DEPT MAIN INJECTOR,BATAVIA,IL 60510. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 37 EP 58 DI 10.1016/0920-5632(94)90764-1 PG 22 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700005 ER PT J AU RAU, R KALMUS, G GLASER, D CHUVILO, I BINGHAM, H KINSON, J PALMER, R ROOS, C FIELDS, T SAMIOS, N PEYROU, C LANDER, R AF RAU, R KALMUS, G GLASER, D CHUVILO, I BINGHAM, H KINSON, J PALMER, R ROOS, C FIELDS, T SAMIOS, N PEYROU, C LANDER, R TI INVENTION AND DEVELOPMENT OF CONVENTIONAL CHAMBERS - DISCUSSION SESSION-1 SO NUCLEAR PHYSICS B LA English DT Discussion C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV CALIF BERKELEY,BERKELEY,CA 94720. ITEP,MOSCOW,RUSSIA. UNIV BIRMINGHAM,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. VANDERBILT UNIV,NASHVILLE,TN 37240. ARGONNE NATL LAB,ARGONNE,IL 60439. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV CALIF DAVIS,DAVIS,CA 95616. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 79 EP 80 PG 2 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700008 ER PT J AU SAMIOS, NP AF SAMIOS, NP TI STABLE PARTICLES SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC ID NARROW C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 44 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 83 EP 96 DI 10.1016/0920-5632(94)90768-4 PG 14 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700009 ER PT J AU PEVSNER, A DERRICK, M CHARLTON, G SCHNEPS, J FILTHUTH, H AF PEVSNER, A DERRICK, M CHARLTON, G SCHNEPS, J FILTHUTH, H TI PARTICLES, RESONANCES AND SU(3) - DISCUSSION SESSION-2 SO NUCLEAR PHYSICS B LA English DT Discussion C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. US DOE,WASHINGTON,DC. ARGONNE NATL LAB,ARGONNE,IL 60439. TUFTS UNIV,MEDFORD,MA 02155. EG&G BERTHOLD,BAD WILDBAD,GERMANY. NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 171 EP 174 PG 4 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700013 ER PT J AU DERRICK, M AF DERRICK, M TI GIANT CHAMBERS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. NR 29 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 177 EP 202 DI 10.1016/0920-5632(94)90773-0 PG 26 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700014 ER PT J AU BALLAM, J DERRICK, M SMART, W SAMIOS, N PALMER, R BIRGE, R CHARLTON, G KENNEY, P KALMUS, G STEVENSON, L ROOS, C CHUVILO, I PLESS, I FILTHUTH, H BARTKE, J SCHMITZ, N LANDER, R AF BALLAM, J DERRICK, M SMART, W SAMIOS, N PALMER, R BIRGE, R CHARLTON, G KENNEY, P KALMUS, G STEVENSON, L ROOS, C CHUVILO, I PLESS, I FILTHUTH, H BARTKE, J SCHMITZ, N LANDER, R TI TECHNICAL ADVANCES - DISCUSSION SESSION-3 SO NUCLEAR PHYSICS B LA English DT Discussion C1 STATE UNIV GHENT,B-9000 GHENT,BELGIUM. ARGONNE NATL LAB,ARGONNE,IL 60439. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. BROOKHAVEN NATL LAB,UPTON,NY 11973. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. US DOE,WASHINGTON,DC. UNIV NOTRE DAME,NOTRE DAME,IN 46556. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. VANDERBILT UNIV,NASHVILLE,TN 37240. MIT,CAMBRIDGE,MA 02139. ITEP,MOSCOW,RUSSIA. EG&G BERTHOLD,BAD WILDBAD,GERMANY. INP,KRAKOW,POLAND. MPI EXTRATERR PHYS,MUNICH,GERMANY. UNIV CALIF DAVIS,DAVIS,CA 95616. NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 263 EP 266 PG 4 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700019 ER PT J AU SAMIOS, N KINSON, J AF SAMIOS, N KINSON, J TI WEAK PROCESSES - DISCUSSION SESSION-4 SO NUCLEAR PHYSICS B LA English DT Discussion C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV BIRMINGHAM,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 293 EP 293 PG 1 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700022 ER PT J AU STEVENSON, L DERRICK, M EKSPONG, G GRAMENITSKY, I CHUVILO, I AF STEVENSON, L DERRICK, M EKSPONG, G GRAMENITSKY, I CHUVILO, I TI HIGH-ENERGY INTERACTIONS - DISCUSSION SESSION-5 SO NUCLEAR PHYSICS B LA English DT Discussion C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. JINR,DUBNA,RUSSIA. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV STOCKHOLM,S-10691 STOCKHOLM,SWEDEN. ITEP,MOSCOW,RUSSIA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 335 EP 336 PG 2 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700025 ER PT J AU PEYROU, C ROUSSET, A HAIDT, D FERBEL, T SAMIOS, N STEVENSON, L PALMER, R CUNDY, D DERRICK, M SACTON, J HAIDT, D AF PEYROU, C ROUSSET, A HAIDT, D FERBEL, T SAMIOS, N STEVENSON, L PALMER, R CUNDY, D DERRICK, M SACTON, J HAIDT, D TI QCD AND THE STANDARD MODEL IN NEUTRINO PHYSICS - DISCUSSION SESSION-6 SO NUCLEAR PHYSICS B LA English DT Discussion C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. AEROSPATIALE,PARIS,FRANCE. DESY,W-2000 HAMBURG 52,GERMANY. UNIV ROCHESTER,ROCHESTER,NY 14627. BROOKHAVEN NATL LAB,UPTON,NY 11973. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CATHOLIQUE LOUVAIN,B-1200 BRUSSELS,BELGIUM. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 415 EP 416 PG 2 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700030 ER PT J AU PEYROU, C KRIGE, J WILLIAMS, P ROUSSET, A WEISSKOPF, V HINE, M RAU, R BARTKE, J DERADO, I WALKER, W MULVEY, J STEVENSON, L AF PEYROU, C KRIGE, J WILLIAMS, P ROUSSET, A WEISSKOPF, V HINE, M RAU, R BARTKE, J DERADO, I WALKER, W MULVEY, J STEVENSON, L TI LEGACIES OF BUBBLE CHAMBERS, CONCLUSIONS - DISCUSSION SESSION-7 SO NUCLEAR PHYSICS B LA English DT Discussion C1 INP,KRAKOW,POLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. EUROPEAN UNIV INST,FLORENCE,ITALY. MPI EXTRATERR PHYS,MUNICH,GERMANY. MIT,CAMBRIDGE,MA 02139. DUKE UNIV,DURHAM,NC 27706. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV OXFORD,OXFORD,ENGLAND. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. AEROSPATIALE,PARIS,FRANCE. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 445 EP 447 PG 3 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700033 ER PT J AU STEVENSON, ML AF STEVENSON, ML TI THE DISCOVERY OF MUON CATALYSIS OF NUCLEAR-FUSION SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 3 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 465 EP 466 PG 2 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700037 ER PT J AU EKSPONG, G STEVENSON, L AF EKSPONG, G STEVENSON, L TI BUBBLES-40 - PROCEEDINGS OF THE CONFERENCE ON THE BUBBLE-CHAMBER AND ITS CONTRIBUTIONS TO PARTICLE PHYSICS (MARKING THE 40TH ANNIVERSARY OF THE BUBBLE-CHAMBER), GENEVA, SWITZERLAND, 14-16 JULY 1993 - OPEN SESSION-1 SO NUCLEAR PHYSICS B LA English DT Discussion C1 UNIV STOCKHOLM,S-10691 STOCKHOLM,SWEDEN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 483 EP 483 PG 1 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700041 ER PT J AU VOYVODIC, L AF VOYVODIC, L TI LEADING PARTICLES, BEAM AND TARGET FRAGMENTATION SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC ID PP INTERACTIONS; GEV-C; COLLISIONS C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 513 EP 516 DI 10.1016/0920-5632(94)90808-7 PG 4 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700049 ER PT J AU FIELDS, T AF FIELDS, T TI AUTOMATIC SCANNING AND MEASURING USING POLLY SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC AB Effects of incorporating a human operator as part of the POLLY scanning and measuring system are briefly described. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 521 EP 522 DI 10.1016/0920-5632(94)90810-9 PG 2 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700051 ER PT J AU FIELDS, T AF FIELDS, T TI BUBBLE-CHAMBER MEASUREMENTS OF CASCADE TIMES IN MESIC ATOMS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT Conference on the Bubble Chamber and its Contributions to Particle Physics, Marking the 40th Anniversary of the Bubble Chamber (BUBBLES 40) CY JUL 14-16, 1993 CL GENEVA, SWITZERLAND SP AMER INST PHYS, CERN, EUROPEAN LAB PARTICLE PHYS, EUROPEAN PHYS SOC AB This paper describes the pioneering role of the bubble chamber in measuring interesting atomic physics quantities such as the cascade time in mesic hydrogen and helium atoms. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 22 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 523 EP 526 DI 10.1016/0920-5632(94)90811-7 PG 4 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700052 ER PT J AU DERRICK, M FIELDS, T WEISSKOPF, V HARIGEL, G KALMUS, G AF DERRICK, M FIELDS, T WEISSKOPF, V HARIGEL, G KALMUS, G TI BUBBLES-40 - PROCEEDINGS OF THE CONFERENCE ON THE BUBBLE-CHAMBER AND ITS CONTRIBUTIONS TO PARTICLE PHYSICS (MARKING THE 40TH ANNIVERSARY OF THE BUBBLE-CHAMBER), GENEVA, SWITZERLAND, 14-16 JULY 1993 - OPEN SESSION-3 SO NUCLEAR PHYSICS B LA English DT Discussion C1 ARGONNE NATL LAB,ARGONNE,IL 60439. MIT,CAMBRIDGE,MA 02139. CERN,CH-1211 GENEVA 23,SWITZERLAND. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL PY 1994 SU 36 BP 537 EP 537 PG 1 WC Physics, Particles & Fields SC Physics GA NY967 UT WOS:A1994NY96700055 ER PT J AU KIM, SH TALEYARKHAN, RP GEORGEVICH, V AF KIM, SH TALEYARKHAN, RP GEORGEVICH, V TI CONTAINMENT PERFORMANCE ANALYSIS OF THE ADVANCED NEUTRON SOURCE REACTOR AT THE OAK-RIDGE-NATIONAL-LABORATORY SO NUCLEAR SAFETY LA English DT Article AB This article discusses salient aspects of methodology, assumptions, and modeling of various features related to the estimation of source terms from two conservatively scoped severe-accident scenarios in the Advanced Neutron Source (ANS) reactor at the Oak Ridge National Laboratory. Various containment configurations are considered for steaming-pool-type accidents and an accident involving molten-core-concrete interaction. Several design features (such as rupture disks) are examined to study containment response during postulated severe accidents. Also, thermal-hydraulic response of the containment and radionuclide transport and retention in the containment are studied. The results are described as transient variations of source terms for each scenario, which are to be used for studying off-site radiological consequences and health effects for these postulated severe accidents. Also highlighted will be a comparison of source terms estimated by two different versions of the MELCOR code. RP KIM, SH (reprint author), OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN 37831, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 205 EP 212 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800004 ER PT J AU CLETCHER, JW AF CLETCHER, JW TI REACTOR SHUTDOWN EXPERIENCE SO NUCLEAR SAFETY LA English DT Article RP CLETCHER, JW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 253 EP 255 PG 3 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800010 ER PT J AU WOLF, JR AKERS, DW NEIMARK, LA AF WOLF, JR AKERS, DW NEIMARK, LA TI RELOCATION OF MOLTEN MATERIAL TO THE TMI-2 LOWER HEAD SO NUCLEAR SAFETY LA English DT Article AB This article presents one possible scenario describing the relocation of debris to the lower head of the Three Mile Island Nuclear Station Unit 2 (TMI-2) reactor vessel and is based on available plant instrumentation records and postaccident examination results. The scenario presented here is not the only potential debris relocation scenario, bur it is consistent with information obtained from plant data, Vessel Investigation Project examinations, analysis efforts, and other TMI-2 programs. This scenario addresses debris relocation events chronologically and assesses factors that may have contributed to the end-state condition of the lower head, the damage to the structures in the lower part of the reactor vessel, and the debris on the lower head. Included is the initial movement of molten material from the core, through the reactor vessel core support assembly to the lower internals, and finally onto the lower head. C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ALPHA GAMMA HOT CELL FACIL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV ENERGY TECHNOL,IRRADIATION PERFORMANCE SECT,ARGONNE,IL 60439. RP WOLF, JR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,NUCL FUELS & MAT UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 19 TC 3 Z9 3 U1 0 U2 2 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 269 EP 279 PG 11 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800012 ER PT J AU NEIMARK, LA AF NEIMARK, LA TI INSIGHT INTO THE TMI-2 CORE MATERIAL RELOCATION THROUGH EXAMINATION OF INSTRUMENT TUBE NOZZLES SO NUCLEAR SAFETY LA English DT Article AB The examination of instrument penetration tube nozzles removed from the lower head of the Three Mile island Nuclear Station Unit 2 (TMI-2) reactor provided key information on the manner in which core debris relocated to and across the lower head. The examinations included visual inspections, gamma spectroscopy, metallography, microhardness measurements, and scanning electron microscopy. The examination results showed varying degrees of damage to the lower-head nozzles from approximate to 50% melt-off to no damage at all to nearby nozzles. The elevations at which nozzle damage occurred suggest that the lower elevations (near the lower head) were protected from molten fuel, apparently by an insulating layer of debris that had cooled and solidified when it reached the lower head. The pattern of nozzle damage suggests fuel movement toward the hot spot location in the vessel wall. Evidence was found for the existence of control assembly debris on the lower head before the massive relocation of fuel occurred. C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ALPHA GAMMA HOT CELL FACIL,ARGONNE,IL 60439. RP NEIMARK, LA (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,IRRADIAT PERFORMANCE SECT,ARGONNE,IL 60439, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 280 EP 287 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800013 ER PT J AU AKERS, DW SCHUETZ, BK AF AKERS, DW SCHUETZ, BK TI PHYSICAL AND RADIOCHEMICAL EXAMINATIONS OF DEBRIS FROM THE TMI-2 LOWER HEAD SO NUCLEAR SAFETY LA English DT Article AB As part of the Three Mile Island Nuclear Station Unit 2 (TMI-2) Vessel Investigation Project, sponsored by the Organization for Economic Cooperation and Development, physical, metallurgical, and radiochemical examinations were performed on samples of previously molten material that had relocated to the lower plenum of the TMI-2 reactor during the accident on March 28, 1979. This article presents the results of those examinations and some limited analyses of these results. Principal conclusions of the examinations are that the bulk lower-head debris is homogeneous and composed primarily of (U,Zr)O-2. This molten material reached temperatures greater than 2600 degrees C and probably reached the lower head as a liquid or slurry at temperatures below the peak temperature. A debris bed composed of particulate debris was formed above a monolithic melt that solidified on the lower head. RP AKERS, DW (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,RADIOANALYT CHEM SECT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 12 TC 7 Z9 7 U1 0 U2 1 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 288 EP 300 PG 13 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800014 ER PT J AU DIERCKS, DR KORTH, GE AF DIERCKS, DR KORTH, GE TI RESULTS OF METALLOGRAPHIC EXAMINATIONS AND MECHANICAL TESTS OF PRESSURE-VESSEL SAMPLES FROM THE TMI-2 LOWER HEAD SO NUCLEAR SAFETY LA English DT Article AB Fifteen prism-shaped steel samples were removed from the lower head of the damaged Three Mile Island Nuclear Station Unit 2 (TMI-2) reactor pressure vessel to assess the effects of approximately 19 metric tons of molten core debris that had relocated there during the 1979 loss-of-coolant accident. Metallographic examinations of the samples revealed that inside-surface temperatures of 800 to 1100 degrees C were attained during the accident in an elliptical ''hot spot'' approximately 1 x 0.8 m. Tensile, creep, and Charpy V-notch specimens were cut from the samples to assess the mechanical properties of the lower-head material at temperatures up to the peak accident temperature. These properties were used in a margin-to-failure analysis of the lower head. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP DIERCKS, DR (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,MECH MAT SECT,ARGONNE,IL 60439, USA. NR 18 TC 4 Z9 4 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 301 EP 312 PG 12 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800015 ER PT J AU REMPE, J STICKLER, L CHAVEZ, S THINNES, G WITT, R CORRADINI, M AF REMPE, J STICKLER, L CHAVEZ, S THINNES, G WITT, R CORRADINI, M TI MARGIN-TO-FAILURE CALCULATIONS FOR THE TMI-2 VESSEL SO NUCLEAR SAFETY LA English DT Article AB As part of the Three Mile Island Unit 2 (TMI-2) Vessel Investigation Project (VIP) sponsored by the Organization for Economic Cooperation and Development (OECD), margin-to-failure (MTF) calculations for mechanisms having the potential to threaten the integrity of the vessel lower head were performed to better understand events that occurred during the TMI-2 accident. Analyses considered four failure mechanisms: penetration tube rupture, penetration tube ejection, global vessel rupture, and localized vessel rupture. Calculational input was based on data from the TMI-2 VIP examinations of the vessel steel samples, penetration tube nozzles, and samples of the hard layer of debris found on the TMI-2 vessel lower head. Sensitivity studies were performed to investigate the uncertainties in key parameters for these analyses. Calculation results indicate that less margin existed for vessel failure mechanisms, rather than tube failure mechanisms, during the TMI-2 accident. In addition, calculations suggest that additional experimental data are needed to reduce uncertainties in models for predicting debris cooling and vessel failure. C1 UNIV WISCONSIN,MADISON,WI 53706. RP REMPE, J (reprint author), IDAHO NATL ENGN LAB,DEPT ADV NUCL ANAL TECHNOL,POB 1625,IDAHO FALLS,ID 83415, USA. OI Rempe, Joy/0000-0001-5527-3549 NR 25 TC 7 Z9 8 U1 0 U2 1 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 313 EP 327 PG 15 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800016 ER PT J AU VANDENHEUVEL, LN CLETCHER, JW COPINGER, DA MINARICK, JW DOLAN, BW OREILLEY, PD AF VANDENHEUVEL, LN CLETCHER, JW COPINGER, DA MINARICK, JW DOLAN, BW OREILLEY, PD TI 1993 ACCIDENT SEQUENCE PRECURSOR (ASP) PROGRAM RESULTS SO NUCLEAR SAFETY LA English DT Article C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. US NUCL REGULATORY COMMISS,WASHINGTON,DC 20555. RP VANDENHEUVEL, LN (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD JUL-DEC PY 1994 VL 35 IS 2 BP 328 EP 338 PG 11 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA QH008 UT WOS:A1994QH00800017 ER PT J AU SEVER, LE AF SEVER, LE TI CONGENITAL-MALFORMATIONS RELATED TO OCCUPATIONAL REPRODUCTIVE HAZARDS SO OCCUPATIONAL MEDICINE-STATE OF THE ART REVIEWS LA English DT Article RP SEVER, LE (reprint author), BATTELLE SEATTLE RES CTR,POB C-5359,SEATTLE,WA 98105, USA. NR 0 TC 29 Z9 29 U1 0 U2 0 PU HANLEY & BELFUS INC PI PHILADELPHIA PA 210 S 13TH ST, PHILADELPHIA, PA 19107 SN 0885-114X J9 OCCUP MED JI Occup. Med.-State Art Rev. PD JUL-SEP PY 1994 VL 9 IS 3 BP 471 EP 494 PG 24 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA PP098 UT WOS:A1994PP09800009 PM 7831593 ER PT J AU WIESENFELD, JM WEISS, S BOTKIN, D CHEMLA, DS AF WIESENFELD, JM WEISS, S BOTKIN, D CHEMLA, DS TI CARRIER TRANSPORT EFFECTS AND DYNAMICS IN MULTIPLE-QUANTUM-WELL OPTICAL AMPLIFIERS SO OPTICAL AND QUANTUM ELECTRONICS LA English DT Article ID SUBPICOSECOND GAIN DYNAMICS; GAALAS LASER-DIODES; AUGER RECOMBINATION; INTERMODULATION DISTORTION; REFRACTIVE-INDEX; WAVE-GUIDES; CAPTURE; MODULATION; BARRIER; INJECTION AB The gain recovery dynamics of multiple quantum well semiconductor optical amplifiers, following gain compression caused by ultrashort optical pulse excitation, have been studied for several devices of different structures. Fast, slow, and intermediate time constants are identified. The fast component (0.6 to 0.9 ps) corresponds to cooling of the dense, inverted electron-hole plasma. The slow component (150 to 300 ps) corresponds to replenishment of carriers from the external bias supply, with the dynamics dominated by spontaneous recombination (primarily Auger) of the electron-hole plasma. The intermediate time constant (2 to 14 ps) is caused by carrier capture by the quantum wells and is structure-dependent. For most of the devices, the capture process is dominated by diffusion-limited transport in the cladding/barrier region. The variation of carrier density and temperature also affects the refractive index profile of the devices and, hence, affects the waveguiding properties, Dynamical variation of the mode confinement factor is observed on the fast and slow timescales defined above. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP WIESENFELD, JM (reprint author), AT&T BELL LABS,CRAWFORD HILL LAB,HOLMDEL,NJ 07733, USA. RI weiss, shimon/B-4164-2009 OI weiss, shimon/0000-0002-0720-5426 NR 66 TC 10 Z9 10 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0306-8919 J9 OPT QUANT ELECTRON JI Opt. Quantum Electron. PD JUL PY 1994 VL 26 IS 7 BP S731 EP S756 DI 10.1007/BF00326659 PG 26 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA PQ291 UT WOS:A1994PQ29100008 ER PT J AU WAN, AS MORENO, JC MACGOWAN, BJ LIBBY, SB KOCH, JA NILSEN, J OSTERHELD, AL SCOFIELD, JH TREBES, JE WALLING, RS AF WAN, AS MORENO, JC MACGOWAN, BJ LIBBY, SB KOCH, JA NILSEN, J OSTERHELD, AL SCOFIELD, JH TREBES, JE WALLING, RS TI CHARACTERIZATION OF GERMANIUM STRIPE X-RAY LASERS SO OPTICAL ENGINEERING LA English DT Article DE X-RAY LASERS; ENHANCED COHERENCE; LASER-PLASMA INTERACTION ID AMPLIFIER AB One method of improving the transverse spatial coherence of x-ray lasers (XRLs) is by adaptive spatial filtering of XRL apertures using geometric shaping in the form of bowtie or wedge XRLs. However, we must maintain the desired geometric shapes in exploding foil or slab configurations during the lasing period. As a first step toward understanding lasing in such geometries, we study the behavior of simple stripe XRLs. Past experience with stripe XRLs deposited on thick plastic substrates resulted in significantly weaker laser intensities as compared to line-focused slab XRLs. Possible reasons for this intensity reduction of stripe XRLs could include mixing at the laser boundary, and changes in plasma, kinetics, and hydrodynamic properties that affect laser gains and propagation. We present experimental and theoretical characterizations of germanium line-focused slab and stripe XRLs. Key experimental parameters we are studying include images of emission profiles of the laser blowoff, angular divergences, XRL output intensities, and ionization balances as we vary XRL designs. We compare the experimental results with 2-D laser deposition and hydrodynamics simulations using LASNEX, and study the changes in ionization balances and level populations from postprocessing LASNEX results. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP WAN, AS (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. NR 19 TC 5 Z9 5 U1 2 U2 3 PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA SN 0091-3286 EI 1560-2303 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2434 EP 2441 DI 10.1117/12.172898 PG 8 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300044 ER PT J AU CHOQUETTE, KD SCHNEIDER, RP LOTT, JA AF CHOQUETTE, KD SCHNEIDER, RP LOTT, JA TI LASING CHARACTERISTICS OF VISIBLE ALGAINP/ALGAAS VERTICAL-CAVITY LASERS SO OPTICS LETTERS LA English DT Article ID SURFACE-EMITTING LASERS; DIODES AB We report the lasing characteristics of gain-guided AlGaInP/AlGaAs visible vertical-cavity surface-emitting laser diodes. At room temperature, continuous-wave operation is achieved over the wavelength range of 657-685 nm with the minimum threshold current at 670 nm. Devices with a 10-mum diameter have threshold currents as low as 1.25 mA at room temperature (297 K) and 0.8 mA at 250 K. In addition, a single predetermined linear polarization state is found, independent of the lasing mode order and operating temperature. RP CHOQUETTE, KD (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 20 Z9 20 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUL 1 PY 1994 VL 19 IS 13 BP 969 EP 971 DI 10.1364/OL.19.000969 PG 3 WC Optics SC Optics GA NU437 UT WOS:A1994NU43700015 PM 19844504 ER PT J AU PAUL, PH DEC, JE AF PAUL, PH DEC, JE TI IMAGING OF REACTION ZONES IN HYDROCARBON AIR FLAMES BY USE OF PLANAR LASER-INDUCED FLUORESCENCE OF CH SO OPTICS LETTERS LA English DT Article AB A method for imaging the reaction zones in hydrocarbon-air flames is described. The technique is based on planar laser-induced fluorescence of the CH radical by use of excitation in the A2DELTA <-- X2PI(1, 0) band and broadband detection from the overlapping (1, 1) and (0, 0) bands. This strategy is found to provide a significant improvement in image quality compared with that from previously employed CH imaging techniques. Results are presented for propane-air flames, and a comparison of possible imaging strategies is given. RP PAUL, PH (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 7 TC 24 Z9 24 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUL 1 PY 1994 VL 19 IS 13 BP 998 EP 1000 DI 10.1364/OL.19.000998 PG 3 WC Optics SC Optics GA NU437 UT WOS:A1994NU43700025 PM 19844514 ER PT J AU MA, YO BERGMAN, RG AF MA, YO BERGMAN, RG TI SYNTHESIS AND REACTIONS OF ENANTIOPURE (NEOMETHYLCYCLOPENTADIENYL)IRIDIUM(III) HALIDES WITH SILVER SALTS - A DRAMATIC STERIC EFFECT ON THE COMPETITION BETWEEN INTERMOLECULAR AND INTRAMOLECULAR C-H ACTIVATION SO ORGANOMETALLICS LA English DT Note ID ASYMMETRIC CATALYTIC-HYDROGENATION; TRANSITION-METAL COMPLEXES; HYDROCARBONS; REACTIVITY; LIGANDS; BONDS AB Reactions of enantiomerically pure (NMCp)M-(PMe3)(Me)X complexes (NMCp = neomenthylcyclopentadienyl; M = Rh, Ir) have revealed that the 16-electron (NMCp)M(Pme3)(Me)+ intermediates are achiral (planar) at the metal centers on the time average. Generation of the presumed intermediate (NMCp)Ir-(Pme3) by photolysis of (NMCp)Ir(Pme3)(H)2 in the presence of hydrocarbons results in intermolecular C-H activation. In contrast, the presumed intermediate (NMCp)M(Pme3)(Me)+ exhibits only intramolecular C-H activation involving the neomenthyl group. One of these cyclometalation products has been structurally characterized. The different outcomes of these two systems are attributed to energy differences in the transition states based on molecular mechanics calculations. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 21 TC 30 Z9 30 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUL PY 1994 VL 13 IS 7 BP 2548 EP 2550 DI 10.1021/om00019a004 PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA NW037 UT WOS:A1994NW03700004 ER PT J AU BOIS, FY TOZER, TN HAUCK, WW CHEN, ML PATNAIK, R WILLIAMS, RL AF BOIS, FY TOZER, TN HAUCK, WW CHEN, ML PATNAIK, R WILLIAMS, RL TI BIOEQUIVALENCE - PERFORMANCE OF SEVERAL MEASURES OF RATE OF ABSORPTION SO PHARMACEUTICAL RESEARCH LA English DT Article AB The highest point of the plasma concentration-time profile, C-max, is currently used by regulatory agencies to assess the rate of drug absorption after single dose administration of oral products. It is, however, quite insensitive, and a number of new measures of rate have been proposed. Using simulations, several approaches toward measuring rate were tested. A set of model scenarios for drugs with typical mean characteristics and statistical distributions was investigated. Using different kinetic models of disposition, the time course of the concentration in plasma was simulated. Intraindividual and interindividual variability and assay error were modeled using Monte Carlo techniques. The accuracy, precision, and ease of use of the various measures of rate were evaluated by simulating crossover design clinical trials and then determining the probability of declaring bioequivalence as a function of differences in rates of absorption between test and reference formulations. All of the rate measures tested showed a degree of insensitivity to changes in rate and no universally superior measure was found. Indeed, the main conclusion is that the choice of a measure should be based on simulations of the particular situation in a bioequivalence trials. C1 UNIV CALIF SAN FRANCISCO,SCH PHARM,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT EPIDEMIOL & BIOSTAT,SAN FRANCISCO,CA 94143. US FDA,CTR DRUG EVALUAT & RES,OFF GENER DRUGS,ROCKVILLE,MD 20855. RP BOIS, FY (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,MAIL STOP 90-3058,BERKELEY,CA 94720, USA. RI Bois, Frederic/E-9241-2012 OI Bois, Frederic/0000-0002-4154-0391 FU PHS HHS [224-91-3007] NR 11 TC 52 Z9 52 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0724-8741 J9 PHARMACEUT RES JI Pharm. Res. PD JUL PY 1994 VL 11 IS 7 BP 966 EP 974 DI 10.1023/A:1018970901116 PG 9 WC Chemistry, Multidisciplinary; Pharmacology & Pharmacy SC Chemistry; Pharmacology & Pharmacy GA NW467 UT WOS:A1994NW46700006 PM 7937556 ER PT J AU ALBERT, DE GRAY, GT AF ALBERT, DE GRAY, GT TI A DESCRIPTION OF DEFORMATION TWINNING IN DYNAMICALLY DEFORMED AND SHOCK-LOADED POLYCRYSTALLINE NI3AL SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID SUPERLATTICE STRUCTURES; ROOM-TEMPERATURE; ALLOYS; NICKEL; SUPERDISLOCATIONS; BEHAVIOR AB Deformation twinning has been documented by means of transmission electron microscopy (TEM) in the gamma'-phase in two nickel aluminide alloys, single-phase Ni3Al + B and two-phase Ni-20 at.% Al-30 at.% Fe. The first intermetallic was shock loaded to a stress of 14 GPa, and the second was dynamically deformed at a strain rate of 3000 s-1 to a total accumulated strain of 16%. In both materials, twins were found to form solely in grains with the L1(2) superlattice structure and were observed to extend completely across the grains. In the two-phase alloy, no twins were found to occur in grains with the B2 superlattice structure. Analysis of the twins show that the twinning plane K1 is {111} with a twinning direction eta1 of [112], such as is commonly found in disordered f.c.c. metals. It is proposed that the eta2 direction in the second undistorted plane K2 is [110], which negates the need for atomic shuffling. The twinning mechanism necessary for this twin plane and the alternate eta2 direction of [112] requiring shuffles is discussed. Extensive planar slip on {111}-type planes was also seen in both materials, and in both the B2 and the L1(2) grains in the two-phase alloy. A high density of stacking faults was observed in the shock-loaded single-phase alloy. RP ALBERT, DE (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87544, USA. NR 39 TC 10 Z9 10 U1 0 U2 2 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 JUL PY 1994 VL 70 IS 1 BP 145 EP 158 PG 14 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA NW780 UT WOS:A1994NW78000010 ER PT J AU CAI, ZX WELCH, DO AF CAI, ZX WELCH, DO TI SIMULATION STUDY OF GRAIN-GROWTH IN LAYERED MATERIALS APPLICATION TO YBA2CU3O7-DELTA CERAMICS SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID COMPUTER-SIMULATION; BOUNDARY ENERGIES AB We propose a simple lattice model which takes into account the anisotropy of grain formation energy to study the grain growth of layered materials such as polycrystalline superconducting cuprates. The anisotropic parameter in this model is estimated in the case of YBa2Cu3O7-delta via a semi-empirical theory for surface energy anisotropy. Monte Carlo simulation shows that the anisotropy of grain formation energy causes abnormal grain growth in which large elongated grains grow at the expense of fine matrix grains. The evolution with time of parameters characterizing the grain sizes and shapes have been calculated. In general, the results agree very well with experimental observation. RP CAI, ZX (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 12 TC 11 Z9 11 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JUL PY 1994 VL 70 IS 1 BP 141 EP 150 DI 10.1080/01418639408240202 PG 10 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA NW789 UT WOS:A1994NW78900013 ER PT J AU FOWLER, CM FREEMAN, BL BROOKS, JS GOETTEE, JD HULTS, WL KING, JC MUELLER, FM RICKEL, DG SMITH, JL AF FOWLER, CM FREEMAN, BL BROOKS, JS GOETTEE, JD HULTS, WL KING, JC MUELLER, FM RICKEL, DG SMITH, JL TI EXPLOSIVELY PRODUCED MEGAGAUSS FIELDS AND RECENT SOLID-STATE APPLICATIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT Todai 1993 International Symposium/4th ISSP International Symposium on Frontiers in High Magnetic Fields CY NOV 10-12, 1993 CL UNIV TOKYO, TOKYO, JAPAN SP UNIV TOKYO, INST SOLID STATE PHYS, UNIV TOKYO HO UNIV TOKYO ID MAGNETIC-FIELDS AB Large magnetic fields may be generated by compression of an initial magnetic flux generated over a large area at relatively low magnetic field into a region of smaller area. Following a discussion of flux compression principles, we discuss megagauss field systems in use at Los Alamos where chemical explosives are used to compress the flux. Their use in some solid state experiments will be discussed briefly, including a planned set of experiments on YBCO to be done jointly with a Russian team, whose aim is to determine the low temperature, critical magnetic field of YBCO. C1 BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. RP FOWLER, CM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Goettee, Jeffrey/L-4926-2015 NR 26 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL-AUG PY 1994 VL 201 BP 33 EP 39 DI 10.1016/0921-4526(94)91046-4 PG 7 WC Physics, Condensed Matter SC Physics GA PJ441 UT WOS:A1994PJ44100009 ER PT J AU BRANDT, BL CROW, JE SCHNEIDERMUNTAU, HJ PARKIN, DM SULLIVAN, NS AF BRANDT, BL CROW, JE SCHNEIDERMUNTAU, HJ PARKIN, DM SULLIVAN, NS TI THE NATIONAL HIGH MAGNETIC-FIELD LABORATORY - A NEW FACILITY IN SUPPORT OF HIGH-FIELD RESEARCH - DC FACILITY IN TALLAHASSEE SO PHYSICA B LA English DT Article; Proceedings Paper CT Todai 1993 International Symposium/4th ISSP International Symposium on Frontiers in High Magnetic Fields CY NOV 10-12, 1993 CL UNIV TOKYO, TOKYO, JAPAN SP UNIV TOKYO, INST SOLID STATE PHYS, UNIV TOKYO HO UNIV TOKYO AB The National High Magnetic Field Laboratory facility in Tallahassee, FL will offer to both national and international users magnets (superconducting magnets up to 20 T, resistive magnets up to 35/40 T, and hybrid magnets up to 45/50 T) in a variety of configurations. Additional specialized magnet systems to support NMR (720/900/1000 MHz), ion cyclotron resonance (up to 12 T, 150 mm) and electron spin resonance studies at high fields will be installed. Major subfacilities for high field research in infrared optics, visible optics, magnetic properties of solids, and low-temperature studies are being developed. C1 LOS ALAMOS NATL LAB,NATL HIGH MAGNET FIELD LAB,LOS ALAMOS,NM 87545. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL-AUG PY 1994 VL 201 BP 504 EP 506 DI 10.1016/0921-4526(94)91148-7 PG 3 WC Physics, Condensed Matter SC Physics GA PJ441 UT WOS:A1994PJ44100111 ER PT J AU CAMPBELL, LJ CROW, JE PARKIN, DM SCHNEIDERMUNTAU, HJ SULLIVAN, NS AF CAMPBELL, LJ CROW, JE PARKIN, DM SCHNEIDERMUNTAU, HJ SULLIVAN, NS TI PULSED-FIELD MAGNETS AT THE US-NHMFL SO PHYSICA B LA English DT Article; Proceedings Paper CT Todai 1993 International Symposium/4th ISSP International Symposium on Frontiers in High Magnetic Fields CY NOV 10-12, 1993 CL UNIV TOKYO, TOKYO, JAPAN SP UNIV TOKYO, INST SOLID STATE PHYS, UNIV TOKYO HO UNIV TOKYO AB The pulsed field facility of the National High Magnetic Field Laboratory (NHMFL) consists of four components. Now available are (1) explosive flux compression, (2) capacitor-driven magnets, and (3) a 20 T superconducting magnet. The fourth component, a 60 T quasi-continuous magnet, has been designed and is scheduled for installation in early 1995. All magnets have He-4 cryostats giving temperatures from room temperature (RT) to 2.2-1.5 K. Dilution refrigerators for the superconducting 20 T magnet and the 50 T pulsed magnet will be installed by early 1994. A wide range of experiments have been completed within the past year. C1 FLORIDA STATE UNIV,NHMFL,TALLAHASSEE,FL 32306. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. RP CAMPBELL, LJ (reprint author), LOS ALAMOS NATL LAB,NHMFL,MS-K765,LOS ALAMOS,NM 87545, USA. NR 9 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL-AUG PY 1994 VL 201 BP 538 EP 541 DI 10.1016/0921-4526(94)91156-8 PG 4 WC Physics, Condensed Matter SC Physics GA PJ441 UT WOS:A1994PJ44100119 ER PT J AU HOFFMANN, W BREITZKE, H BAENITZ, M HEINZE, M LUDERS, K BUNTKOWSKY, G LIMBACH, HH ANTIPOV, EV GIPPIUS, AA LOEBICH, O KHAN, HR PARANTHAMAN, M THOMPSON, JR AF HOFFMANN, W BREITZKE, H BAENITZ, M HEINZE, M LUDERS, K BUNTKOWSKY, G LIMBACH, HH ANTIPOV, EV GIPPIUS, AA LOEBICH, O KHAN, HR PARANTHAMAN, M THOMPSON, JR TI APPLICATION OF HG-199 SOLID-STATE NMR TO HG BASED HTSC SO PHYSICA C LA English DT Article ID HIGH-TC-SUPERCONDUCTOR; NQR; CU; HGBA2CACU2O6+DELTA; HGBA2CUO4+DELTA; BA2YCU3O7; SHIFTS; SALTS AB It is proposed to study Hg-oxide ceramics, which are high-temperature superconductors, with Hg-199 NMR spectroscopy. As an exemplary application of this method first room-temperature Hg-199 spectra and spin-lattice relaxation times of samples with different macrostructure are presented. A spin-lattice relaxation time of T1 = 35 ms is found. All samples exhibit similar characteristic powder spectra caused by an axially symmetric Hg-199 spin interaction. The isotropic value and the anisotropy of the tensor relative to solid HgCl2 as a standard substance is estimated. C1 FREE UNIV BERLIN,INST EXPTL PHYS,ARNIMALLEE 14,D-14195 BERLIN,GERMANY. FREE UNIV BERLIN,INST ORGAN CHEM,D-14195 BERLIN,GERMANY. MOSCOW MV LOMONOSOV STATE UNIV,119899 MOSCOW,RUSSIA. FORSCHUNGSINST EDELMET & MET CHEM,D-73525 SCHWABISCH GMUND,GERMANY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Gippius, Andrey/D-1139-2010; Buntkowsky, Gerd/B-3206-2010; Limbach, Hans-Heinrich/G-8858-2011; Paranthaman, Mariappan/N-3866-2015; Baenitz, Michael/E-4085-2016; Antipov, Evgeny/A-4138-2014 OI Buntkowsky, Gerd/0000-0003-1304-9762; Limbach, Hans-Heinrich/0000-0002-2084-6359; Paranthaman, Mariappan/0000-0003-3009-8531; Antipov, Evgeny/0000-0002-8886-8829 NR 19 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1994 VL 227 IS 3-4 BP 225 EP 229 DI 10.1016/0921-4534(94)90075-2 PG 5 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900002 ER PT J AU ZHANG, JP GROENKE, DA DABROWSKI, B POEPPELMEIER, KR MARKS, LD AF ZHANG, JP GROENKE, DA DABROWSKI, B POEPPELMEIER, KR MARKS, LD TI CA INDUCED LINE DEFECTS AND SUPERCONDUCTIVITY IN YXSR2CU2GAO7 SO PHYSICA C LA English DT Article ID CRYSTAL-STRUCTURE; COMPOUND; OXIDES; FAMILY AB The microstructure of Ca doped Y1-xCaxSr2Cu2GaO7 and Ca substituted YSr2-xCaxCu2GaO7 have been investigated by electron microscopy. A common feature found in the Y1-xCaxSr2Cu2GaO7 superconductors is the existence of line defects, which are not observed in non-superconducting YSr2-xCaxCu2GaO7. At the higher doping level, x almost-equal-to 0.35, the line defects develop into modulated structures. The transition temperature and Meissner fraction increases with the doping level as does the defect concentration, indicating that the defects and superconductivity in these materials are interrelated. The line defects are associated with an asymmetrical distortion (a(p) not-equal b(p)) of the gallium-oxygen plane which plays a similar role to the copper-oxygen chains in YBa2Cu3O7-delta. C1 NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCONDUCT,EVANSTON,IL 60208. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RI Marks, Laurence/B-7527-2009 NR 16 TC 2 Z9 2 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 JUL 1 PY 1994 VL 227 IS 3-4 BP 259 EP 266 DI 10.1016/0921-4534(94)90080-9 PG 8 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900007 ER PT J AU MITCHELL, JF HINKS, DG WAGNER, JL AF MITCHELL, JF HINKS, DG WAGNER, JL TI LOW-PRESSURE SYNTHESIS OF TETRAGONAL SR2CUO3+X FROM A SINGLE-SOURCE HYDROXOMETALLATE PRECURSOR SO PHYSICA C LA English DT Article ID COPPER AB Synthesis of the tetragonal ''high-pressure'' form of Sr2CuO3+x at 370-degrees-C in 1 atm oxygen from a copper hydroxometallate precursor, Sr2Cu(OH)6 is reponed. Results of thermogravimetric analysis, and in-situ X-ray diffraction on the thermal decomposition of the precursor are described. The as-synthesized tetragonal material is nonsuperconducting and is irreversibly convened to the orthorhombic phase by heating at 450-degrees-C in 1 atm 02. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RP MITCHELL, JF (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 10 TC 27 Z9 27 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 JUL 1 PY 1994 VL 227 IS 3-4 BP 279 EP 284 DI 10.1016/0921-4534(94)90082-5 PG 6 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900009 ER PT J AU MING, X CANFIELD, PC OSTENSON, JE FINNEMORE, DK CHO, BK WANG, ZR JOHNSTON, DC AF MING, X CANFIELD, PC OSTENSON, JE FINNEMORE, DK CHO, BK WANG, ZR JOHNSTON, DC TI SUPERCONDUCTING STATE MAGNETIZATION AND CRITICAL FIELDS OF SINGLE-CRYSTAL YNI2B2C SO PHYSICA C LA English DT Article ID REVERSIBLE MAGNETIZATION; FLUCTUATIONS AB Single crystals of YNi2B2C have been grown via high-temperature flux growth, using Ni2B as a solvent. Magnetization measurements have been carried out over a large portion of the magnetic field-temperature plane on a single crystal of YNi2B2C for field applied parallel to the c-axis in order to determine the range of thermodynamic reversibility and the critical magnetic fields. The magnetization is thermodynamically reversible within 2% of the magnetization for fields above 0.5 T and temperatures above 3 K. Near T(c), the upper critical field has a slope of -0.32 T/K. The zero-temperature Ginzburg-Landau parameter K is 13 approximately 15, the penetration depth lambda(ab) is about 150 nm, and the coherence distance lambda(ab), is about 10 nm. The irreversibility line H(irr)(T) obeys H(irr)(T)=H(irr)(0)(1-T/T(c))1.16. The magnetization data below T(c) closely follow a logarithmic dependence on applied field, in the intermediate region, as predicted by the London model. The magnetization versus temperature curves shift uniformly to lower temperature as the field increases. Based on these measurements, YNi2B2C seems more similar to conventional low-T(c) superconductors than to high-T(c) superconductors. C1 IOWA STATE UNIV SCI & TECHNOL,SCH PHYS & ASTRON,AMES,IA 50011. RP MING, X (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Canfield, Paul/H-2698-2014 NR 15 TC 7 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1994 VL 227 IS 3-4 BP 321 EP 326 PG 6 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900015 ER PT J AU JIAN, M ALMERAS, P KELLEY, RJ BERGER, H MARGARITONDO, G UMEZAWA, A COHEN, ML ONELLION, M AF JIAN, M ALMERAS, P KELLEY, RJ BERGER, H MARGARITONDO, G UMEZAWA, A COHEN, ML ONELLION, M TI EFFECT OF IODINE DOPING ON BI2SR2CA1CU2OX - CHARGE-TRANSFER OR INTERLAYER COUPLING SO PHYSICA C LA English DT Article ID SUPERCONDUCTING TRANSITION-TEMPERATURE; HIGH-TC SUPERCONDUCTORS; EPITAXIAL INTERCALATION; SINGLE-CRYSTALS; OXIDE; BI2SR2CAN-1CUNOY; BI2SR2CACU2OX AB A comparative study has been made of iodine-intercalated Bi2Sr2Ca1Cu2Ox single crystal and 1 atm O2 annealed Bi2Sr2Ca1Cu1Ox single crystal using an AC susceptibility measurement, X-ray photoemission (XPS) and angle-resolved ultraviolet photoemission spectroscopy (ARUPS). The AC susceptibility measurement indicates that O2 doped samples studied have a T(c) of 84 K, whereas T(c) of the iodine-doped samples studied are 80 K. XPS Cu 2p core-level data establish that the hole concentration in the CuO2 planes is essentially the same for these two kinds of samples. ARUPS measurements show that the electronic structure of the normal states near the Fermi level has been strongly affected by iodine intercalation. We conclude that the dominant effect of iodine doping is to alter the interlayer coupling. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV WISCONSIN,CTR APPL SUPERCONDUCT,MADISON,WI 53706. ECOLE POLYTECH FED LAUSANNE,INST PHYS APPL,CH-1015 LAUSANNE,SWITZERLAND. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Margaritondo, Giorgio/B-1367-2008 NR 22 TC 1 Z9 1 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 JUL 1 PY 1994 VL 227 IS 3-4 BP 371 EP 376 PG 6 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900022 ER PT J AU MOVSHOVICH, R HUNDLEY, MF THOMPSON, JD CANFIELD, PC CHO, BK CHUBUKOV, AV AF MOVSHOVICH, R HUNDLEY, MF THOMPSON, JD CANFIELD, PC CHO, BK CHUBUKOV, AV TI SPECIFIC-HEAT OF SINGLE-CRYSTAL YNI2B2C AND TMNI2B2C SUPERCONDUCTORS SO PHYSICA C LA English DT Article AB We have measured the specific heat of single crystals of superconducting YNi2B2C and TmNi2B2C. Analysis of YNi2B2C data in zero and 5 T magnetic fields indicates modestly strong electron-phonon coupling and a superconducting energy gap DELTA(0) = 29 K. Superconductivity coexists with antiferromagnetic order below 1.5 K in TmNi2B2C. An interpretation of very low temperature specific heat indicates substantial magnetic anisotropy, with ferromagnetic planes weakly coupled antiferromagnetically to each other. Two-dimensional ferromagnetic spin waves produce a large linear-in-temperature contribution to the specific heat. We find no compelling evidence for an unconventional pairing mechanism in these systems. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV WISCONSIN,MADISON,WI 53706. RI Canfield, Paul/H-2698-2014 NR 13 TC 121 Z9 121 U1 3 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1994 VL 227 IS 3-4 BP 381 EP 386 DI 10.1016/0921-4534(94)90097-3 PG 6 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900024 ER PT J AU SAFRONOVA, UI SAFRONOVA, MS SNYDERMAN, NJ PALCHIKOV, VG AF SAFRONOVA, UI SAFRONOVA, MS SNYDERMAN, NJ PALCHIKOV, VG TI RELATIVISTIC PERTURBATION-THEORY CALCULATION OF 2-ELECTRON DOUBLY-EXCITED STATES SO PHYSICA SCRIPTA LA English DT Article ID HYDROGEN-LIKE ATOMS; HELIUM-LIKE IONS; SELF-ENERGY; LAMB SHIFT; HE-LIKE; SYSTEMS AB Relativistic perturbation theory has been applied to the calculation of the energies of 2lj2l'j'[J] states in the range of Z = 10-100. The non-diagonal elements for non-degenerate states are discussed. Numerical results were obtained in the intermediate coupline scheme. The intermediate coupling coefficients were used for calculation of autoionization widths. The decay amplitudes for 2lj2l'j'[J] are calculated with Dirac functions. The influence of relativistic effects on the autoionization widths is discussed. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. INST PHYS TECH MEASUREMENTS,MENDELEYEVSK 141570,RUSSIA. RP SAFRONOVA, UI (reprint author), UNIV NEVADA,RENO,NV 89557, USA. NR 32 TC 3 Z9 3 U1 0 U2 0 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD JUL PY 1994 VL 50 IS 1 BP 29 EP 44 DI 10.1088/0031-8949/50/1/005 PG 16 WC Physics, Multidisciplinary SC Physics GA NX783 UT WOS:A1994NX78300005 ER PT J AU STAPP, HP AF STAPP, HP TI THEORETICAL-MODEL OF A PURPORTED EMPIRICAL VIOLATION OF THE PREDICTIONS OF QUANTUM-THEORY SO PHYSICAL REVIEW A LA English DT Article ID MECHANICS AB A generalization of Weinberg's nonlinear quantum theory is used to model a reported violation of the predictions of orthodox quantum theory. RP STAPP, HP (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 16 TC 15 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 18 EP 22 DI 10.1103/PhysRevA.50.18 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100006 ER PT J AU YUNG, KC YEE, JH AF YUNG, KC YEE, JH TI DERIVATION OF THE MODIFIED SCHORDINGER EQUATION FOR A PARTICLE WITH A SPATIALLY VARYING MASS THROUGH PATH-INTEGRALS SO PHYSICAL REVIEW A LA English DT Article ID DEPENDENT EFFECTIVE MASSES; ABRUPT HETEROJUNCTIONS; SEMICONDUCTOR THEORY; HETEROSTRUCTURES; HAMILTONIANS AB This paper describes our first-principles derivation of the Hamiltonian for the calculation of the bound states for a particle with a spatially varying mass in an arbitrary potential well. Our approach is based on the Feynman path-integral technique and results in a Hermitian form of the Schrodinger equation that conserves current at the boundary. We deduced the correct operator ordering for the Hamiltonian and found a correctional term that can be viewed as an effective potential. C1 LAWRENCE LIVERMORE NATL LAB,DIV ENGN RES,LIVERMORE,CA 94550. RP YUNG, KC (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616, USA. NR 15 TC 26 Z9 27 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 JUL PY 1994 VL 50 IS 1 BP 104 EP 106 DI 10.1103/PhysRevA.50.104 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100016 ER PT J AU BUDKER, D DEMILLE, D COMMINS, ED ZOLOTOREV, MS AF BUDKER, D DEMILLE, D COMMINS, ED ZOLOTOREV, MS TI EXPERIMENTAL INVESTIGATION OF EXCITED-STATES IN ATOMIC DYSPROSIUM SO PHYSICAL REVIEW A LA English DT Article ID RARE-EARTH ATOMS; LIFETIME MEASUREMENTS; LASER SPECTROSCOPY; NEUTRAL YTTERBIUM; SPECTRA AB A pair of closely lying states of opposite parity and the same total electronic angular momentum (J = 10) at 19797.96 cm-1 in dysprosium is experimentally investigated with the goal of evaluating parameters relevant to parity and parity-time-reversal violation experiments. An atomic beam apparatus is used. The states of interest are populated with a sequence of two laser pulses, and a third laser pulse and fluorescence detection are used to probe the state population. Their lifetimes are determined from the dependence of the fluorescence signal on the time delay between the pump and probe pulses. The lifetime of the even-parity state was also measured by a different method involving detection of cascade fluorescence. Spectroscopy of radio-frequency E1 transitions between the opposite-parity states is performed when one of the states is populated and the population of the other is probed. This determines precise energy separations between various isotope and hyperfine structure components, and allows extraction of the corresponding isotope shift and hyperfine structure parameters. Electric polarizability is determined from radio-frequency line shapes in the presence of a dc electric field. As part of the preparation of a parity violation experiment, level-crossing signals which occur when various Zeeman components of the closest hyperfine components (isotope 163, F = 10.5; initial separation 3.1 MHz) are brought together in the presence of collinear electric and magnetic fields were studied. These measurements provide an independent determination of the E1 matrix element between the opposite-parity states. In addition, lifetimes, isotope, and hyperfine structure of other dysprosium states are obtained and a number of narrow autoionization resonances (GAMMA < 10 cm-1) are observed. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP BUDKER, D (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Budker, Dmitry/F-7580-2016 OI Budker, Dmitry/0000-0002-7356-4814 NR 41 TC 36 Z9 36 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 132 EP 143 DI 10.1103/PhysRevA.50.132 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100020 ER PT J AU LIBERMAN, DA ALBRITTON, JR WILSON, BG ALLEY, WE AF LIBERMAN, DA ALBRITTON, JR WILSON, BG ALLEY, WE TI SELF-CONSISTENT-FIELD CALCULATIONS OF ATOMS AND IONS USING A MODIFIED LOCAL-DENSITY APPROXIMATION SO PHYSICAL REVIEW A LA English DT Article ID OPTICAL-RESPONSE; PROGRAM AB Local-density-approximation calculations of atomic structure are useful for the description of atoms and ions in plasmas. The large number of different atomic configurations that exist in typical plasmas leads one to consider the expression of total energies in terms of a Taylor series in the orbital occupation numbers. Two schemes for computing the second derivative Taylor-series coefficients are given; the second, and better one, uses the linear response method developed by Zangwill and Soven [Phys. Rev. A 21, 1561 (1980)] for the calculation of optical response in atoms. A defect in the local-density approximation causes some second derivatives involving Rydberg orbitals to be infinite. This is corrected by using a modified local-density approximation that had previously been proposed [Phys. Rev. B 2, 244 (1970)]. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 12 TC 10 Z9 10 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 EI 1094-1622 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 171 EP 176 DI 10.1103/PhysRevA.50.171 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100022 ER PT J AU CHENG, KT CHEN, MH JOHNSON, WR SAPIRSTEIN, J AF CHENG, KT CHEN, MH JOHNSON, WR SAPIRSTEIN, J TI RELATIVISTIC CONFIGURATION-INTERACTION CALCULATIONS FOR THE GROUND-STATE AND N = 2 SINGLET-STATES OF HELIUM-LIKE IONS SO PHYSICAL REVIEW A LA English DT Article ID MULTICONFIGURATIONAL DIRAC-FOCK; LAMB-SHIFT CALCULATIONS; ISOELECTRONIC SEQUENCE; PRECISION-MEASUREMENT; TRIPLET-STATES; HEAVY ATOMS; HYDROGENLIKE; TRANSITIONS; ENERGIES; POTENTIALS AB Term energies are determined for the ground state and n = 2 singlet states of heliumlike ions with nuclear charges in the range 4 less-than-or-equal-to Z less-than-or-equal-to 92. These calculations are based on the relativistic no-pair Hamiltonian which includes both the Coulomb interaction and the retarded Breit interaction. Single-particle wave functions are expanded in a B-spline basis constructed from Dirac-Coulomb orbitals restricted to a finite cavity. The Hamiltonian matrix is evaluated and Davidson's method is used to determine the lowest few eigenenergies and eigenfunctions for each angular symmetry. Quantum electrodynamic corrections are also calculated. We find good, but not precise, agreement between theory and experiment for the Kalpha x-ray energies. It is argued that high-precision x-ray measurements for highly charged ions are needed to further test the theory. C1 UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. RP CHENG, KT (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 39 TC 90 Z9 90 U1 1 U2 3 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 JUL PY 1994 VL 50 IS 1 BP 247 EP 255 DI 10.1103/PhysRevA.50.247 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100032 ER PT J AU BURGDORFER, J ANDERSSON, LR MCGUIRE, JH ISHIHARA, T AF BURGDORFER, J ANDERSSON, LR MCGUIRE, JH ISHIHARA, T TI INELASTIC ATOMIC SCATTERING BY HIGH-ENERGY PHOTONS AND CHARGED-PARTICLES SO PHYSICAL REVIEW A LA English DT Article ID TO-SINGLE PHOTOIONIZATION; DOUBLE-IONIZATION; SYNCHROTRON-RADIATION; HELIUM; RATIO; PROTONS; IMPACT; HE AB The first-order cross section for Compton scattering is expressed in terms of the cross section for scattering by fast charged particles in the plane-wave Born approximation as a function of the momentum, Q, transferred by the projectile to the atomic electron(s). As an example of this relationship, the high-energy photon limit for the ratio of double to single ionization by Compton scattering, R(C)(Q), is expressed in terms of the ratio, R(Z)(Q), for scattering by charged particles at large Q. Results for R(C)(Q) are presented. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. TSUKUBA UNIV,INST APPL PHYS,IBARAKI 305,JAPAN. RP BURGDORFER, J (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 30 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 349 EP 353 DI 10.1103/PhysRevA.50.349 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100043 ER PT J AU DUBOIS, RD AF DUBOIS, RD TI FORWARD ELECTRON-EMISSION IN C(Q+)-HE COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; ATOM COLLISIONS; IONIZATION; IMPACT; HELIUM; GASES; IONS AB Differential cross sections are presented for 15-degrees and 20-degrees electron emission in 100- and 150-keV/u C(q+)He collisions where the projectile charge states are 0 to 4+. Coincidences between electrons emitted at 20-degrees and projectiles which captured or lost electrons in the collisions were also measured. The coincidence and noncoincidence data are used to demonstrate how partial screening of the projectile nuclear charge and direct interactions between projectile and target electrons influence the electron emission. In addition, the relative importance of multielectron transitions associated with either electron capture or electron loss by the projectile is demonstrated. Finally, the data are used to test whether saddle-point ionization is important in these ionizing collisions, as has recently been suggested. The present data do not support this suggestion and are in disagreement with the measurements which do support it. Furthermore, it is demonstrated that dressed ion impact data are inappropriate for testing for a saddle-point ionization mechanism. RP DUBOIS, RD (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 14 TC 13 Z9 13 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 JUL PY 1994 VL 50 IS 1 BP 364 EP 370 DI 10.1103/PhysRevA.50.364 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100046 ER PT J AU COOPER, JW SOUTHWORTH, SH MACDONALD, MA LEBRUN, T AF COOPER, JW SOUTHWORTH, SH MACDONALD, MA LEBRUN, T TI CASCADE EFFECTS ON THE AR LMM AUGER SPECTRUM SO PHYSICAL REVIEW A LA English DT Article ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; ARGON; THRESHOLD; STATE; GASES AB Generally, at excitation energies well above inner-shell ionization thresholds, Auger spectra are independent of the method of excitation. A notable exception to this has been found for the Ar L2,3MM Auger spectra where different results are obtained via electron-impact ionization at 2 and 4.5 keV and photoionization below the K edge at 3.17 and 2.2 keV. The differences are explained by the variation of the contribution of L1 to L2,3 Vacancy transfers with the mode of excitation. Calculations using a simple vacancy transfer model explain the observed spectra. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. RP COOPER, JW (reprint author), UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLL PK,MD 20742, USA. NR 32 TC 23 Z9 23 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 405 EP 411 DI 10.1103/PhysRevA.50.405 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100051 ER PT J AU KELLER, N MILLER, RD WESTERLIND, M ELSTON, SB SELLIN, IA ANDERSSON, LR BIEDERMANN, C CEDERQUIST, H AF KELLER, N MILLER, RD WESTERLIND, M ELSTON, SB SELLIN, IA ANDERSSON, LR BIEDERMANN, C CEDERQUIST, H TI ANGULAR-DISTRIBUTIONS FOR SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE IN SLOW C(4+)-NE COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; LOW-ENERGY COLLISIONS; HIGHLY CHARGED IONS; 2-ELECTRON CAPTURE; C4+-HE COLLISIONS; HE; AR; ATOMS; C-4+; SPECTROSCOPY AB In an earlier experiment by H. Cederquist et al. [J. Phys. B 18, 3951 (1985)] an unusual Q-value distribution for true double-electron capture was reported for 400-eV C4+-Ne collisions: strong population of reaction channels resulting in Q values between 27 and 35 eV followed by weakly populated channels in the region 18-25 eV and then again a strong channel at Q=16 eV. The last channel is nearly degenerate in Q value with the dominant single-electron capture reaction. Here, we report measured angular distributions for scattered projectiles in single- and double-electron capture at collision energies 0.6-1.0 keV. At 0.6 keV both single- and double-electron capture exhibit strong forward peaks for Q approximately 16 eV. The intensity for the latter, but not the former, decreases drastically when the energy is raised to 1 keV. The energy dependence of the angular distribution for double-electron capture with Q > 20 eV can be qualitatively understood in simple terms; single-electron captures to 2s and 2p orbitals, however, yield unexpectedly wide and structured angular distributions. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV STOCKHOLM,S-10405 STOCKHOLM,SWEDEN. RP KELLER, N (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 25 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 462 EP 467 DI 10.1103/PhysRevA.50.462 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100058 ER PT J AU MACEK, JH OVCHINNIKOV, SY AF MACEK, JH OVCHINNIKOV, SY TI ADIABATIC THEORY OF WANNIER THRESHOLD LAWS AND IONIZATION CROSS-SECTIONS SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-ATOM IONIZATION; COLLISIONS AB Adiabatic energy eigenvalues of H-2+ are computed for complex values of the internuclear distance R. The infinite number of bound-state eigenenergies are represented by a function epsilon(R) that is single valued on a multisheeted Riemann surface. A region is found where epsilon(R) and the corresponding eigenfunctions exhibit harmonic-oscillator structure characteristic of electron motion on a potential saddle. The Schrodinger equation is solved in the adiabatic approximation along a path in the complex R plane to compute ionization cross sections. The cross section thus obtained joins the Wannier threshold region with the keV energy region, but the exponent near the ionization threshold disagrees with well-accepted values. Accepted values are obtained when a lowest-order diabatic correction is employed, indicating that adiabatic approximations do not give the correct zero velocity limit for ionization cross sections. Semiclassical eigenvalues for general top-of-barrier motion are given and the theory is applied to the ionization of atomic hydrogen by electron impact. The theory with a first diabatic correction gives the Wannier threshold law even for this case. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. AF IOFFE PHYS TECH INST,ST PETERSBURG,RUSSIA. RP MACEK, JH (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Ovchinnikov, Serguei/C-4994-2014 NR 27 TC 34 Z9 34 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 468 EP 483 DI 10.1103/PhysRevA.50.468 PG 16 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100059 ER PT J AU RAFTERY, D LONG, HW SHYKIND, D GRANDINETTI, PJ PINES, A AF RAFTERY, D LONG, HW SHYKIND, D GRANDINETTI, PJ PINES, A TI MULTIPLE-PULSE NUCLEAR-MAGNETIC-RESONANCE OF OPTICALLY PUMPED XENON IN A LOW MAGNETIC-FIELD SO PHYSICAL REVIEW A LA English DT Article ID CROSS-POLARIZATION; QUANTUM-MECHANICS; POLYMER SURFACE; NMR; XE-129; GAS; LINEARITY; ATOMS; NE-21 AB Multiple-pulse coherent averaging methods are used to increase the resolution and frequency range of optically pumped xenon NMR in nutation and point-by-point precession experiments. We observe quadrupolar splittings in Xe-131 spectra due to the macroscopic asymmetry of pumping cells similar to those reported previously, but with reduced demands on magnetic-field homogeneity. Cell treatment with hydrogen gas increases the quadrupolar splittings by a factor of 3 over bare Pyrex cells. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Grandinetti, Philip/F-1084-2010 OI Grandinetti, Philip/0000-0003-0102-316X NR 38 TC 27 Z9 27 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 567 EP 574 DI 10.1103/PhysRevA.50.567 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100070 ER PT J AU CHRZAN, DC MILLS, MJ AF CHRZAN, DC MILLS, MJ TI CRITICALITY IN THE PLASTIC-DEFORMATION OF L 1(2) INTERMETALLIC COMPOUNDS SO PHYSICAL REVIEW B LA English DT Article ID ANOMALOUS YIELD BEHAVIOR; L12 ALLOYS; WEAK-BEAM; NI3AL; DISLOCATIONS; TEMPERATURE; MOTION AB It is argued that dislocations in the L1(2) intermetallic compounds displaying the yield strength anomaly undergo a stress-driven pinning-depinning transition. The transition is from a dynamic phase in which a moving dislocation becomes immobile to a dynamic phase in which a moving dislocation, in an infinite medium, remains mobile for all time. The distribution of event times and areas, where an ''event'' is the mobilization and subsequent immobilization of a dislocation, is related to measurements of the primary creep transient. At the critical point of the proposed transition, the distribution of events becomes scale invariant. A simple scaling hypothesis connects the scaling behavior of the transition to the time dependence of the creep tests. A simplified model of dislocation motion is presented and used to study the properties of the transition. The properties so calculated are not obviously consistent with the published interpretations of experiments, but are consistent with the published data. A reinterpretation of those experiments is proposed. RP CHRZAN, DC (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 20 TC 14 Z9 14 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 JUL 1 PY 1994 VL 50 IS 1 BP 30 EP 42 DI 10.1103/PhysRevB.50.30 PG 13 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100004 ER PT J AU BUSCH, K SOUKOULIS, CM ECONOMOU, EN AF BUSCH, K SOUKOULIS, CM ECONOMOU, EN TI TRANSPORT AND SCATTERING MEAN FREE PATHS OF CLASSICAL WAVES SO PHYSICAL REVIEW B LA English DT Article ID LOCALIZATION; MEDIA AB Transport, as well as scattering, mean free paths are calculated within the weak-scattering approximation and within a recently developed extension of the well-known coherent-potential approximation for a random arrangement of dielectric spheres. The different theoretical results of the mean free paths are compared with experiments on scattering from dielectric spheres. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV KARLSRUHE,INST THEORIE KONDENSIERTEN MAT,D-76128 KARLSRUHE,GERMANY. UNIV CRETE,FORTH,RES CTR CRETE,IRAKLION,GREECE. UNIV CRETE,DEPT PHYS,IRAKLION,GREECE. RP BUSCH, K (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Economou, Eleftherios /E-6374-2010; Soukoulis, Costas/A-5295-2008 NR 13 TC 37 Z9 38 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 93 EP 98 DI 10.1103/PhysRevB.50.93 PG 6 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100011 ER PT J AU ZOU, J CARLSSON, AE AF ZOU, J CARLSSON, AE TI MEDIUM-RANGE INTERACTIONS AND STRUCTURAL COMPLEXITY IN ALUMINUM-BASED INTERMETALLIC COMPOUNDS SO PHYSICAL REVIEW B LA English DT Article ID SIMPLE MONATOMIC LIQUID; QUASI-CRYSTALS; ICOSAHEDRAL PHASE; AL-MN; QUASICRYSTALS; ALLOYS; ORDER AB Aluminum-transition-metal compounds, at the aluminum end of their phase diagrams, form a fascinating variety of complex structures. We present a microscopic theory of the chemical trends in the phase stability of these complex structures based on a remarkably strong and long-range interaction between the transition-metal atoms in an aluminum host. The mechanism described here provides a satisfactory explanation of the observed chemical trends. We also treat the effects of Cu on the transition-metal interactions. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. RP ZOU, J (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 25 TC 10 Z9 10 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 JUL 1 PY 1994 VL 50 IS 1 BP 99 EP 102 DI 10.1103/PhysRevB.50.99 PG 4 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100012 ER PT J AU KAWASHIMA, N GUBERNATIS, JE EVERTZ, HG AF KAWASHIMA, N GUBERNATIS, JE EVERTZ, HG TI LOOP ALGORITHMS FOR QUANTUM SIMULATIONS OF FERMION MODELS ON LATTICES SO PHYSICAL REVIEW B LA English DT Article ID MONTE-CARLO SIMULATIONS; SYSTEMS AB Two cluster algorithms, based on constructing and flipping loops, are presented for world-line quantum Monte Carlo simulations of fermions and are tested on the one-dimensional repulsive Hubbard model. We call these algorithms the loop-flip and loop-exchange algorithms. For these two algorithms and the standard world-line algorithm, we calculated the autocorrelation times for various physical quantities and found that the ordinary world-line algorithm, which uses only local moves, suffers from very long correlation times that makes not only the estimate of the error difficult but also the estimate of the average values themselves difficult. These difficulties are especially severe in the low-temperature, large-U regime. In contrast, we find that new algorithms, when used alone or in combinations with themselves and the standard algorithm, can have significantly smaller autocorrelation times, in some cases being smaller by three orders of magnitude. The new algorithms, which use nonlocal moves, are discussed from the point of view of a general prescription for developing cluster algorithms. The loop-flip algorithm is also shown to be ergodic and to belong to the grand canonical ensemble. Extensions to other models and higher dimensions are briefly discussed. C1 UNIV GEORGIA,DEPT PHYS,CTR SIMULAT PHYS,ATHENS,GA 30602. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. RP KAWASHIMA, N (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. RI Evertz, Hans/O-5975-2015 OI Evertz, Hans/0000-0002-2037-0725 NR 22 TC 49 Z9 49 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 JUL 1 PY 1994 VL 50 IS 1 BP 136 EP 149 DI 10.1103/PhysRevB.50.136 PG 14 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100018 ER PT J AU PADUANI, C BELANGER, DP WANG, J HAN, SJ NICKLOW, RM AF PADUANI, C BELANGER, DP WANG, J HAN, SJ NICKLOW, RM TI MAGNETIC EXCITATIONS IN THE DILUTE ANISOTROPIC ANTIFERROMAGNET FE(X)ZN(1-X)F2 SO PHYSICAL REVIEW B LA English DT Article ID ISING-CLUSTER EXCITATIONS; PERCOLATION-THRESHOLD; SPIN-WAVES; FERROMAGNETS; SCATTERING; CROSSOVER; FRACTONS; MAGNONS AB We have measured magnetic excitations in dilute crystals of the three-dimensional anisotropic antiferromagnet FexZn1-xF2 with x = 0.69, 0.59, and 0.31 using inelastic-neutron-scattering techniques. Well-defined spin excitations at the higher concentrations are not observed above the transition temperature. A magnetic excitation spectrum with significant structure is observed at low temperature. In the case of x = 0.59, we observe three nearly dispersionless intensity peaks in the energy scans. The lowest-energy peak dominates near the zone center. The three energy peaks become comparable in intensity as the zone boundary is approached. The structure in the peaks, if measured under conditions of low instrumental resolution, could appear as damping away from the zone center, consistent with the behavior reported previously for the similar but less anisotropic system Mn0.5Zn0.5F2, where the apparent damping has been identified with ''fracton'' effects. We argue that such an interpretation is, for the most part, inappropriate for FexZn1-xF2 for x greater-than-or-equal-to 0.31, where the percolation threshold is x(p) = 0.24, and highly questionable for the Mn0.5Zn0.5F2 system. C1 UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RI Paduani, Clederson/F-1233-2017 OI Paduani, Clederson/0000-0001-8034-1769 NR 28 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 193 EP 199 DI 10.1103/PhysRevB.50.193 PG 7 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100025 ER PT J AU COOKE, JF BLACKMAN, JA AF COOKE, JF BLACKMAN, JA TI MAGNETIC FORM-FACTOR FOR ITINERANT-ELECTRON SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID FERROMAGNETIC IRON; ENERGY-BANDS; NICKEL AB First-principles calculations of the itinerant-electron magnetic form factor for ferromagnets which include both the spin and orbital contributions have been completed for ferromagnetic nickel and iron. To our knowledge, these are the first calculations of this type for 3d ferromagnets. These calculations also include, by necessity, the spin-orbit interaction. Numerical results based on spin polarized bands used previously by Cooke et al. [Phys. Rev. B 21, 4118 (1980)] have been found to be in good agreement with experiment while results based on local density bands were found to be in good agreement for iron but not for nickel. In addition, it has been shown that if the energy dependence of the radial part of the wave functions can be ignored then the dominant terms in the itinerant-electron form factor can be written in a form almost identical to the atomic form factor. This provides an explanation for why fits to the atomic form factor have been so successful. C1 UNIV READING,DEPT PHYS,READING RG6 2AH,BERKS,ENGLAND. RP COOKE, JF (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 16 TC 1 Z9 1 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 226 EP 233 DI 10.1103/PhysRevB.50.226 PG 8 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100029 ER PT J AU ADROJA, DT RAINFORD, BD MALIK, SK GAILLOUX, M GSCHNEIDNER, KA AF ADROJA, DT RAINFORD, BD MALIK, SK GAILLOUX, M GSCHNEIDNER, KA TI KONDO AND CRYSTAL-FIELD EFFECTS IN THE COMPOUND YBPTGA SO PHYSICAL REVIEW B LA English DT Article ID VALENCE-FLUCTUATING SYSTEM; HEAT-CAPACITY; LATTICE; YBNISN; STATE AB The equiatomic ternary compound YbPtGa has been investigated by neutron diffraction, magnetic susceptibility, electrical resistivity, and low-temperature heat capacity measurements. A profile refinement of neutron diffraction data reveals that YbPtGa crystallizes in the orthorhombic TiNiSi-type structure. A lambda-type anomaly is observed in the heat capacity at 3.8 K, and a broad maximum in the susceptibility is seen at 4 K, suggesting magnetic ordering of the Yb moment. The temperature dependence of the magnetic scattering resistivity exhibits a behavior consistent with Kondo-type interactions in the presence of crystalline electric field effects. C1 TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP ADROJA, DT (reprint author), UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. NR 14 TC 12 Z9 12 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 JUL 1 PY 1994 VL 50 IS 1 BP 248 EP 251 DI 10.1103/PhysRevB.50.248 PG 4 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100032 ER PT J AU KOELLING, DD AF KOELLING, DD TI MAGNETIC MULTILAYERS WITH (NB,MO,CR) SPACER MATERIALS SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM-WELL STATES; MOLECULAR-BEAM EPITAXY; SPIN-DENSITY-WAVE; ELECTRONIC-STRUCTURE; INTERLAYER EXCHANGE; OSCILLATORY EXCHANGE; FERROMAGNETIC LAYERS; FE/CR SUPERLATTICES; SHORT-PERIOD; ENHANCED MAGNETORESISTANCE AB The properties of Nb, Mo, and Cr as the spacers in magnetic/nonmagnetic multilayers are examined. Utilizing the simple Ruderman-Kittel-Kasuya-Yosida-like response-function theory, one can elucidate not only which features of the bulk band structures are relevant but also discuss the implications of the spacers being inhomogeneously strained. The crucial question proves to be determining which caliper can resist all the broadening effects to appear actually as a macroscopic quantum effect. One mechanism is to minimize scattering by selecting wave functions with substantial s and p character. Another is to maximize the effective velocity and thereby minimize dephasing by the existing scattering. In Nb (110) and Mo (100), such considerations select Kohn-anomaly calipers which arise from the N-centered ellipses. Consideration of resilience to scattering effects is crucial to explaining why the Mo (100) repeat distance appears at three layers instead of at the two layers as seen in Cr. The uniform long repeat distances seen in Cr for the (100), (211), and (110) and the (110) repeat distance in Mo appear to be internally consistent in that they occur from the rim of the DELTA centered lens surfaces and involve the strong MiXing Of t2g and e(g) d states. The analysis also suggests several factors which help to understand the systematics observed for spacers across the transition series. RP KOELLING, DD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 95 TC 43 Z9 43 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 273 EP 290 DI 10.1103/PhysRevB.50.273 PG 18 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100035 ER PT J AU NIYAZ, P SCALETTAR, RT FONG, CY BATROUNI, GG AF NIYAZ, P SCALETTAR, RT FONG, CY BATROUNI, GG TI PHASE-TRANSITIONS IN AN INTERACTING BOSON MODEL WITH NEAR-NEIGHBOR REPULSION SO PHYSICAL REVIEW B LA English DT Article ID MONTE-CARLO SIMULATIONS; PATH-INTEGRAL COMPUTATION; EXTENDED HUBBARD-MODEL; INSULATOR TRANSITION; UNIVERSAL CONDUCTIVITY; SYSTEMS; LOCALIZATION; DIAGRAM; DENSITY; MOTT AB We study the order of the zero temperature quantum phase transitions at density rho = 1 in the one-dimensional extended boson Hubbard model by examining the order parameter distribution and hysteresis effects. The phase diagram of the model at rho = 1/2, a generalization of the spin-1/2 XXZ Hamiltonian, is also obtained, and the possibility of a supersolid region is discussed. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. RI Batrouni, George/A-9318-2009 NR 38 TC 43 Z9 43 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 JUL 1 PY 1994 VL 50 IS 1 BP 362 EP 373 DI 10.1103/PhysRevB.50.362 PG 12 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100046 ER PT J AU RIERA, JA DAGOTTO, E AF RIERA, JA DAGOTTO, E TI OPTICAL CONDUCTIVITY OF THE HUBBARD-MODEL AT FINITE-TEMPERATURE SO PHYSICAL REVIEW B LA English DT Article ID T-J MODELS; DYNAMIC PROPERTIES; RESISTIVITY AB The optical conductivity, sigma(omega), of the two-dimensional one-band Hubbard model is calculated at finite temperature using exact diagonalization techniques on finite clusters. The in-plane dc resistivity, rho(ab), is also evaluated. We find that at large U/t and temperature T, rho(ab) is approximately linear with temperature. We also observed that sigma(omega) displays charge excitations, a midinfrared (MIR) band, and a Drude peak. The combination of the Drude peak and the MIR oscillator strengths leads to a conductivity that decays slower than 1/omega2 at energies smaller than the insulator gap near half filling. C1 VANDERBILT UNIV, DEPT PHYS & ASTRON, NASHVILLE, TN 37235 USA. FLORIDA STATE UNIV, DEPT PHYS, NATL HIGH MAGNET FIELD LAB, TALLAHASSEE, FL 32306 USA. RP OAK RIDGE NATL LAB, DIV PHYS, CTR COMPUTAT INTENS PHYS, OAK RIDGE, TN 37831 USA. RI Riera, Jose/A-1234-2008 OI Riera, Jose/0000-0003-4546-1137 NR 21 TC 13 Z9 13 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 452 EP 456 DI 10.1103/PhysRevB.50.452 PG 5 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100055 ER PT J AU KOSHELEV, AE AF KOSHELEV, AE TI GINZBURG-LANDAU THEORY OF FLUCTUATION MAGNETIZATION OF 2-DIMENSIONAL SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID ONE-COMPONENT PLASMA; HIGH-TC SUPERCONDUCTORS; UPPER CRITICAL-FIELD; II SUPERCONDUCTORS; LAYERED SUPERCONDUCTORS; VORTEX FLUCTUATIONS; REVERSIBLE MAGNETIZATION; TYPE-2 SUPERCONDUCTORS; INDUCED DIAMAGNETISM; PERTURBATION-SERIES AB Large fluctuation-induced magnetization has been observed recently in the quasi-two-dimensional high-T(c) materials. A satisfactory theoretical description of this phenomenon is absent at the moment. We present an extensive study of the fluctuation magnetization M1 of two-dimensional superconductors within the Ginzburg-Landau theory in different regions of the phase diagram. In the normal state one has to distinguish the regions of weak/Gaussian and strong/critical fluctuations. Different kinds of scaling dependencies for M1 are predicted for these regions. An important feature of the field dependence of M1 in the weak-fluctuation regime is saturation of the magnetization at high fields. Taking into account both regular and critical contributions to M1 we obtain an expression that is valid in both regions. In the mixed state at high fields the fluctuation magnetization is completely determined by the thermal elastic fluctuations in the lattice state. Due to suppression of the elastic modulii, M1 increases mainly as 1/(H(c2)-B) as the field approaches the critical region near the upper critical field H(c2). At small fields, B << H(c2), there are two independent contributions to M1 which can be treated separately. One comes from the Gaussian excitations in the vortex cores and the other from the thermal motion of the vortices. We demonstrate that the vortex system in this limit is equivalent to the model of the one-component two-dimensional Coulomb plasma. Using Monte Carlo results for this model, we estimate M1 in the vortex-lattice as well as in the vortex-liquid state. RP KOSHELEV, AE (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Koshelev, Alexei/K-3971-2013 OI Koshelev, Alexei/0000-0002-1167-5906 NR 38 TC 80 Z9 81 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 JUL 1 PY 1994 VL 50 IS 1 BP 506 EP 516 DI 10.1103/PhysRevB.50.506 PG 11 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100063 ER PT J AU MARSH, GE AF MARSH, GE TI FLUX-FLOW AND FLUX CUTTING IN TYPE-II SUPERCONDUCTORS CARRYING A LONGITUDINAL CURRENT SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC-FIELDS; STATE AB A heuristic model of flux flow and vortex cutting that does not imply a buildup of longitudinal flux is given for type-II superconducting cylinders carrying a current in the presence of an axial magnetic field. RP MARSH, GE (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 24 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 571 EP 574 DI 10.1103/PhysRevB.50.571 PG 4 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100075 ER PT J AU BALATSKY, AV MONTHOUX, P PINES, D AF BALATSKY, AV MONTHOUX, P PINES, D TI INFLUENCE OF MAGNETIC IMPERFECTIONS ON THE LOW-TEMPERATURE PROPERTIES OF D-WAVE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID YBA2CU3O7; OXIDES; MODEL; STATE AB We consider the influence ot planar ''magnetic'' imperfections which destroy the local magnetic order, such as Zn impurities or Cu2+ vacancies, on the low-temperature properties of the cuprate superconductors. In the unitary limit, at low temperatures, for a d(x)2-y2 pairing state such imperfections produce low-energy quasiparticles with an anistropic spectrum in the vicinity of the nodes. We find that for the La2-xSrxCuO4 system, one is in the quasi-one-dimensional regime of quasiparticle scattering, discussed recently by Altshuler, Balatsky, and Rosengren, for impurity concentrations in excess of approximately 0.16% whereas Ya-Ba-Cu-O7 appears likely to be in the true two-dimensional scattering regime for Zn concentrations less than 1.6%. We show the neutron-scattering results of Mason et al. [Phys. Rev. Lett. 71, 919 (1993)] on La1.86Sr0.14CuO4 provide strong evidence for ''dirty d-wave'' superconductivity in their samples. We obtain simple expressions for the dynamic spin susceptibility and Cu-63 spin-lattice relaxation time, 63T1, in the superconducting state. C1 LANDAU INST THEORET PHYS,MOSCOW,RUSSIA. UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP BALATSKY, AV (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 25 TC 7 Z9 7 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 JUL 1 PY 1994 VL 50 IS 1 BP 582 EP 585 DI 10.1103/PhysRevB.50.582 PG 4 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100078 ER PT J AU SUH, BJ BORSA, F XU, M TORGESON, DR ZHU, WJ HUANG, YZ ZHAO, ZX AF SUH, BJ BORSA, F XU, M TORGESON, DR ZHU, WJ HUANG, YZ ZHAO, ZX TI HG-199 KNIGHT-SHIFT AND SPIN-LATTICE RELAXATION IN HGBA2 CUO4+DELTA SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC-FIELD DEPENDENCE; SUPERCONDUCTING STATE; PLANAR COPPER; CU-O; NMR; YBA2CU3O7; RATES; TC; HGBA2CUO4+DELTA; ANISOTROPY AB Hg-199 NMR spectra and T1(-1) are reported for two samples of HgBa2CuO4+delta with superconducting transitions at T(c) = 95 K and T(c) = 80 K, respectively. The spectra are characteristic powder patterns with large anisotropic shifts: 3K(ax) = - 0.43% and -0.52%, respectively, for the two samples at room temperature with negligible temperature dependence below T(c). The isotropic Knight shifts were of order K(iso) = +0.11% with respect to a Hg(NO3)2 aqueous solution. The relaxation rate is Korringa-like above T(c) while below T(c) the relaxation rate drops down exponentially without enhancement near T(c). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. ACAD SINICA,INST PHYS,NATL LAB SUPERCOND,BEIJING 100080,PEOPLES R CHINA. RP SUH, BJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 21 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 651 EP 654 DI 10.1103/PhysRevB.50.651 PG 4 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100096 ER PT J AU ALEXANDER, FJ HUSE, DA JANOWSKY, SA AF ALEXANDER, FJ HUSE, DA JANOWSKY, SA TI DYNAMICAL SCALING AND DECAY OF CORRELATIONS FOR SPINODAL DECOMPOSITION AT TC SO PHYSICAL REVIEW B LA English DT Article ID CONSERVED-ORDER-PARAMETER; GROWTH-KINETICS; RENORMALIZATION-GROUP; DOMAIN-GROWTH; MONTE-CARLO; EXPONENT; SYSTEMS; LIMIT AB We have investigated the nonequilibrium critical dynamics of a two-dimensional, spin-exchange (i.e., conserved magnetization), kinetic Ising model following quenches to T(c) from random initial states. As in the case of subcritical quenches, we observe dynamical scaling of the equal time order parameter correlation function G(r, t, t), but here the nonequilibrium correlation length grows as L(t) is similar to t1/z, where z = 15/4 is the usual dynamic critical exponent for this system. Moreover, we find dynamical scaling for correlations with the initial condition G(r, 0, t). The temporal decay of autocorrelations at T(c) yields a critical exponent lambda(c) = 1.96 +/- 0.05 for the nonequilibrium dynamics: G(r, 0, t) almost-equal-to L(-lambda(c))(t)G(r/L(t)). C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. AT&T BELL LABS,MURRAY HILL,NJ 07974. RUTGERS STATE UNIV,DEPT MATH,NEW BRUNSWICK,NJ 08903. NR 31 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 2 BP 663 EP 667 DI 10.1103/PhysRevB.50.663 PG 5 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700001 ER PT J AU BIRTCHER, RC DONNELLY, SE TEMPLIER, C AF BIRTCHER, RC DONNELLY, SE TEMPLIER, C TI EVOLUTION OF HELIUM BUBBLES IN ALUMINUM DURING HEAVY-ION IRRADIATION SO PHYSICAL REVIEW B LA English DT Article ID DENSITY AB The evolution of individual He bubbles in thin Al foils during 200-keV Xe irradiation at room-temperature has been followed with in situ transmission electron microscopy. He bubbles were produced by room-temperature implantation of 3-keV He ions into prethinned aluminum samples. During subsequent xenon irradiation, several distinct processes were observed to cause individual He bubbles to increase or decrease in size. Bubble growth was observed to take place by radiation-induced coalescence of bubbles without bubble motion. This coalescence was a result of the net displacement of Al atoms out of the volume between bubbles initially in close proximity. The resulting nonequilibrium-shaped bubble evolved towards a more energetically favorable spherical shape whose final size was determined by equilibrium bubble pressure. Bubbles were observed to disappear as the specimen surface was removed by sputtering. Bubbles unaffected by sputtering were observed to decrease in size at an average rate of 0.1 to 0.2 nm/(10(15) Xe/cm2) or 0.024 to 0.048 nm/dpa (displacements per atom). This rate of bubble shrinkage can be understood on the basis of direct displacement of He out of the bubble while the bubble remains at equilibrium pressure. He resolution occurred at a rate of 0.005 to 0.01 (He(ejected)/He)/dpa. No examples were found that would indicate complete destruction of a bubble by a single Xe ion. Bubble centers remained fixed during bubble shrinkage indicating negligible bubble motion during room-temperature irradiation. C1 UNIV SALFORD,DEPT ELECTR & ELECT ENGN,SALFORD M5 4WT,LANCS,ENGLAND. UNIV POITIERS,MET PHYS LAB,F-86022 POITIERS,FRANCE. RP BIRTCHER, RC (reprint author), ARGONNE NATL LAB,DEPT MAT SCI,ARGONNE,IL 60439, USA. OI Donnelly, Stephen/0000-0002-9749-5550 NR 15 TC 38 Z9 40 U1 0 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 2 BP 764 EP 769 DI 10.1103/PhysRevB.50.764 PG 6 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700016 ER PT J AU RUBIN, JB SCHWARZ, RB AF RUBIN, JB SCHWARZ, RB TI SHEAR MODULUS OF COEVAPORATED NI1-XZRX THIN-FILMS SO PHYSICAL REVIEW B LA English DT Article ID SHORT-RANGE ORDER; AMORPHOUS-ALLOYS; METALLIC GLASSES; THERMODYNAMIC FUNCTIONS; ASSOCIATION MODEL; ELASTIC-CONSTANTS; LIQUID ALLOYS; ZR; NI; TEMPERATURE AB Electron-beam evaporation was used to deposit Ni1-xZrx alloy thin films, 0 < x < 1.0, onto piezoelectric quartz-crystal substrates. For 0.1 < x < 0.87, the films are single-phase amorphous. Surface acoustic (Rayleigh) waves were generated and detected on the substrates using interdigital transducers predeposited on the substrate surface. The difference between the Rayleigh wave velocity before and after the deposition of the Ni1-xZrx films is used to deduce the shear modulus, mu(x), of the films through a first-order perturbation theory. For all compositions, mu(x) is lower than the weighted average of the mu values of the pure Ni and Zr films. Within the range 0.1 < x < 0.87, mu(x) has five narrow maxima indicative of chemical short-range ordering at selected compositions. C1 LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. NR 63 TC 22 Z9 22 U1 2 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 JUL 1 PY 1994 VL 50 IS 2 BP 795 EP 804 DI 10.1103/PhysRevB.50.795 PG 10 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700020 ER PT J AU MCNEIL, JA PRICE, CE AF MCNEIL, JA PRICE, CE TI AUTOCORRELATION TIMES FOR THE N-FOLD-WAY MONTE-CARLO ALGORITHM SO PHYSICAL REVIEW B LA English DT Article ID SPIN SYSTEMS AB We present calculations of the autocorrelation times for the N-fold-way Monte Carlo algorithm applied to the two-dimensional (2D) Ising model. We present a proof of microreversibility which points out an error in the configuration weight factor used in the earlier work. We test the corrected N-fold-way algorithm on the 2D Ising model and, while still suffering from critical slowing, we find significant improvement in the autocorrelation times compared with the standard Metropolis approach. C1 BROOKHAVEN NATL LAB, RELAT HEAVY ION COLLIDER, UPTON, NY 11973 USA. RP COLORADO SCH MINES, DEPT PHYS, GOLDEN, CO 80401 USA. NR 8 TC 1 Z9 1 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 2 BP 1057 EP 1060 DI 10.1103/PhysRevB.50.1057 PG 4 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700047 ER PT J AU LORENZO, JE HIROTA, K SHIRANE, G TRANQUADA, JM HASE, M UCHINOKURA, K KOJIMA, H TANAKA, I SHIBUYA, Y AF LORENZO, JE HIROTA, K SHIRANE, G TRANQUADA, JM HASE, M UCHINOKURA, K KOJIMA, H TANAKA, I SHIBUYA, Y TI SOFT LONGITUDINAL MODES IN SPIN-SINGLET CUGEO3 SO PHYSICAL REVIEW B LA English DT Note ID DYNAMICAL PHASE TRANSITION; NEUTRON-SCATTERING; PEIERLS TRANSITION; NB3SN AB We present results from a neutron-scattering study of lattice anomalies associated with the transition to the gapped spin-singlet state observed in the spin-1/2 linear-chain compound CuGeO3. Instead of the lattice dimerization along the chain direction (c axis) expected for a spin-Peierls system, we observe a remarkable softening of the longitudinal acoustic phonons in a direction (along the b axis) perpendicular to the chains. A spontaneous strain appears in the same direction below the magnetic transition temperature of 14 K. C1 UNIV TOKYO,DEPT APPL PHYS,TOKYO 113,JAPAN. YAMANASHI UNIV,INST INORGAN SYNTH,KOFU,YAMANASHI 400,JAPAN. RP LORENZO, JE (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Hirota, Kazuma/C-6797-2008; Tranquada, John/A-9832-2009; Tanaka, Isao/D-1519-2012; Hase, Masashi/B-8900-2008; OI Tranquada, John/0000-0003-4984-8857; Hase, Masashi/0000-0003-2717-461X; Tanaka, Isao/0000-0002-2736-7107 NR 17 TC 108 Z9 108 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 JUL 1 PY 1994 VL 50 IS 2 BP 1278 EP 1281 DI 10.1103/PhysRevB.50.1278 PG 4 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700077 ER PT J AU CHUNG, M KUO, YK XU, ZG DELONG, LE BRILL, JW BUDHANI, RC AF CHUNG, M KUO, YK XU, ZG DELONG, LE BRILL, JW BUDHANI, RC TI EFFECTS OF TRANSPORT CURRENT AND COLUMNAR DEFECTS ON THE RF PENETRATION DEPTH OF NBSE2 SO PHYSICAL REVIEW B LA English DT Note ID VIBRATING SUPERCONDUCTORS; FLUX; CRYSTALS; LATTICE; 2H-NBSE2; LINE; IRREVERSIBILITY; IRRADIATION; YBA2CU3O7; 2H-TASE2 AB We report on simultaneous measurements of the dc critical current and rf penetration depth of superconducting 2H-NbSe2. We observed that the large peak in the dc critical current (the ''peak effect'') occurs at the same applied magnetic field H(T) as a maximum in the rf penetration depth, indicating that the anomaly in flux-line dynamics is associated with a change in flux-line pinning strength. The anomalies in the critical current and rf penetration depth disappear in a sample with a high density of columnar defects produced by Ag-ion bombardment; both superconducting and charge-density-wave phase transitions are substantially broadened by the defects. C1 BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973. RP CHUNG, M (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 39 TC 14 Z9 14 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 JUL 1 PY 1994 VL 50 IS 2 BP 1329 EP 1332 DI 10.1103/PhysRevB.50.1329 PG 4 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700090 ER PT J AU DING, H CAMPUZANO, JC GOFRON, K GU, C LIU, R VEAL, BW JENNINGS, G AF DING, H CAMPUZANO, JC GOFRON, K GU, C LIU, R VEAL, BW JENNINGS, G TI GAP ANISOTROPY IN BI2SR2CACU2O8+DELTA BY ULTRAHIGH-RESOLUTION ANGLE-RESOLVED PHOTOEMISSION SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTING TRANSITION; STATE; PLANE AB Ultrahigh-resolution (DELTAE up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of Bi2Sr2CaCu2O8+delta (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with a value close to zero, along the GAMMA-X and GAMMA-Y symmetry directions, while a large gap (DELTA = 22 meV) is observed along the GAMMA-M (Cu-O bond) direction. However, the observation of gap anisotropy may depend on sample conditions; in a few cases the gap becomes more isotropic. A dip in the spectral weight at 65 meV below the Fermi energy is clearly observed only in samples with an anisotropic gap. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. RP DING, H (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Campuzano, Juan Carlos/G-4358-2012; OI Ding, Hong/0000-0003-4422-9248 NR 15 TC 65 Z9 65 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 JUL 1 PY 1994 VL 50 IS 2 BP 1333 EP 1336 DI 10.1103/PhysRevB.50.1333 PG 4 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700091 ER PT J AU GOLDMAN, M BURMESTER, CP WILLE, LT GRONSKY, R AF GOLDMAN, M BURMESTER, CP WILLE, LT GRONSKY, R TI DEFORMATION SUPERSTRUCTURES, TWEED, AND OXYGEN-VACANCY ORDERING ASSOCIATED WITH PHASE-TRANSFORMATIONS IN YBA2CU3OZ SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; DIFFUSE-SCATTERING; CRYSTAL; MICROSTRUCTURE; DIFFRACTION; SIMULATION; ORIGIN AB A theoretical technique is described, employing Monte Carlo simulation, which allows the investigation of strain effects associate-d with transformations in solids. The method applies a grand canonical stress ensemble in the study of elasticity during phase evolution in YBa2Cu3Oz where both oxygen occupancy and atomic positions in the basal plane, as well as total sample volume, can vary. Quenching experiments yield both metastable square-root 2a0 x square-root 2a0 superstructures from short-wavelength modulations and a tweed texture from long-period [110] modulations of the ordered z = 7.0 compound. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP GOLDMAN, M (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 30 TC 15 Z9 15 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 JUL 1 PY 1994 VL 50 IS 2 BP 1337 EP 1340 DI 10.1103/PhysRevB.50.1337 PG 4 WC Physics, Condensed Matter SC Physics GA NX637 UT WOS:A1994NX63700092 ER PT J AU FRAUENDORF, S SHEIKH, JA ROWLEY, N AF FRAUENDORF, S SHEIKH, JA ROWLEY, N TI CONSEQUENCES OF NEUTRON-PROTON INTERACTIONS ON BACKBENDING SO PHYSICAL REVIEW C LA English DT Article ID NUCLEI; REGION; MODEL; BANDS; CE AB The influence of neutron-proton correlations on backbending is investigated in a single-j-shell model. It is shown that these correlations are quenched if the neutrons and Protons fill a high-j intruder orbital asymmetrically. This is due to the repulsive neutron-Proton correlation energy in these configurations and is responsible for the observed forking of the ground state band into proton and neutron S bands. C1 OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. UNIV MANCHESTER,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. UNIV SURREY,DEPT PHYS,GUILDFORD GU2 5XH,SURREY,ENGLAND. RP FRAUENDORF, S (reprint author), ROSSENDORF INC,RES CTR,INST NUCL & HADRON PHYS,PB 510119,D-01314 DRESDEN,GERMANY. NR 16 TC 20 Z9 20 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 JUL PY 1994 VL 50 IS 1 BP 196 EP 201 DI 10.1103/PhysRevC.50.196 PG 6 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700025 ER PT J AU KEITH, CD GOULD, CR HAASE, DG ROBERSON, NR TORNOW, W HALE, GM HOFMANN, HM POSTMA, H AF KEITH, CD GOULD, CR HAASE, DG ROBERSON, NR TORNOW, W HALE, GM HOFMANN, HM POSTMA, H TI SENSITIVITY OF POLARIZED NEUTRON-POLARIZED HE-3 SCATTERING TO THE EXCITED-LEVEL STRUCTURE OF HE-4 SO PHYSICAL REVIEW C LA English DT Article ID YAKUBOVSKY AB Calculations of polarized neutron-polarized He-3 scattering are presented for the transverse and longitudinal total cross-section differences DELTAsigma(T) and DELTAsigma(L) in the energy range E(n) = 0.1 to 10 MeV. Predictions made from phase-shift analyses, R-matrix analysis, and a multichannel resonating group model calculation are compared. The predictions are in qualitative agreement and show that polarized neutron-polarized He-3 scattering is sensitive to the level structure of He-4 in the excitation energy range 20-30 MeV. C1 TRIANGLE UNIV NUCL LAB,DURHAM,NC 27708. DUKE UNIV,DURHAM,NC 27708. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV ERLANGEN NURNBERG,INST THEORET PHYS 3,D-91058 ERLANGEN,GERMANY. UNIV TECHNOL DELFT,2600 GA DELFT,NETHERLANDS. RP KEITH, CD (reprint author), N CAROLINA STATE UNIV,RALEIGH,NC 27695, USA. RI Gould, Christopher/M-7676-2013 NR 20 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1994 VL 50 IS 1 BP 237 EP 244 DI 10.1103/PhysRevC.50.237 PG 8 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700029 ER PT J AU HJORT, EL BRADY, FP ROMERO, JL DRUMMOND, JR SORENSON, DS OSBORNE, JH MCEACHERN, B HANSEN, LF AF HJORT, EL BRADY, FP ROMERO, JL DRUMMOND, JR SORENSON, DS OSBORNE, JH MCEACHERN, B HANSEN, LF TI MEASUREMENTS AND ANALYSIS OF NEUTRON ELASTIC-SCATTERING AT 65 MEV SO PHYSICAL REVIEW C LA English DT Article ID CHARGE SYMMETRY-BREAKING; OPTICAL-MODEL; NUCLEON-SCATTERING; FINITE NUCLEI; POTENTIALS; SYSTEM AB Elastic scattering cross sections for 65 MeV neutrons have been measured for natural targets of C, Si, Cd, Fe, Sn, and Pb at laboratory angles from 6-degrees to 45-degrees. A unique, compact detection system consisting of a CH2 (proton) converter and large-acceptance, wire-chamber-based, recoil-proton telescope is utilized for the measurements. The data are compared with macroscopic optical model potentials derived from proton scattering. In addition, comparisons with the microscopic optical model potentials, those of Jeukenne-Lejeune-Mahaux and Yamaguchi-Nagata-Matsuda, give a very good fit to the data. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 94550. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. RP HJORT, EL (reprint author), UNIV CALIF DAVIS,CROCKER NUCL LAB,DAVIS,CA 94550, USA. NR 36 TC 43 Z9 43 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 JUL PY 1994 VL 50 IS 1 BP 275 EP 281 DI 10.1103/PhysRevC.50.275 PG 7 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700033 ER PT J AU SATCHLER, GR AF SATCHLER, GR TI EXAMINATION OF A PROPERLY DEFORMED FOLDING POTENTIAL FOR THE ANALYSIS OF NUCLEAR INELASTIC-SCATTERING AND COMPARISON WITH TRUE FOLDED POTENTIALS SO PHYSICAL REVIEW C LA English DT Article ID ISOSCALAR TRANSITION RATES; ALPHA-SCATTERING; EXCITATION AB A series of recent papers has introduced a ''properly deformed folding potential'' an applied it to the analysis of inelastic alpha-particle scattering from nuclei. We examine this procedure and find that it is no more appropriate for the folding model than other potential deformation prescriptions. To first order in the deformation for rotors, or exactly for harmonic vibrators, the procedure is equivalent to the uniform radial strain model of Onley, Reynolds, and Wright. In common with other deformed potential models, it provides a transition potential which is not uniquely related to an underlying transition density. Transition moments extracted from measurements using deformed optical potentials are thus subject to uncontrolled uncertainty. We recommend that, instead, explicit folding be used to generate potentials. Although a choice of transition density has to be made, its relation to the transition potential, and hence to measurements, is then unambiguous. The octupole excitation of Pb-208 by a particles of 139 MeV is taken as an illustrative example. RP SATCHLER, GR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 17 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1994 VL 50 IS 1 BP 317 EP 320 DI 10.1103/PhysRevC.50.317 PG 4 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700039 ER PT J AU WADSWORTH, R ANDREWS, HR BEAUSANG, CW CLARK, RM DEGRAAF, J FOSSAN, DB GALINDOURIBARRI, A HIBBERT, IM HAUSCHILD, K HUGHES, JR JANZEN, VP LAFOSSE, DR MULLINS, SM PAUL, ES PERSSON, L PILOTTE, S RADFORD, DC SCHNARE, H VASKA, P WARD, D WILSON, JN RAGNARSSON, I AF WADSWORTH, R ANDREWS, HR BEAUSANG, CW CLARK, RM DEGRAAF, J FOSSAN, DB GALINDOURIBARRI, A HIBBERT, IM HAUSCHILD, K HUGHES, JR JANZEN, VP LAFOSSE, DR MULLINS, SM PAUL, ES PERSSON, L PILOTTE, S RADFORD, DC SCHNARE, H VASKA, P WARD, D WILSON, JN RAGNARSSON, I TI ROTATIONAL STRUCTURES IN SN-106 - A NEW FORM OF BAND TERMINATION SO PHYSICAL REVIEW C LA English DT Note ID HIGH-SPIN; ISOTOPES AB Two weakly populated rotational bands have been established in Sn-106 from the (Fe(Ni, alpha2p))-Fe-54-Ni-58 reaction at 243 MeV. One of the bands shows evidence of termination. The result is consistent with cranked Nilsson model calculations, which predict band terminations with a smooth and gradual shape change from a prolate collective to an oblate noncollective structure. C1 AECL RES,CHALK RIVER LABS,CHALK RIVER K0J 1J0,ON,CANADA. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,ENGLAND. UNIV TORONTO,DEPT PHYS,TORONTO M5S 1A7,ONTARIO,CANADA. SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON L8S 4M1,ONTARIO,CANADA. UNIV OTTAWA,DEPT PHYS,OTTAWA K1N 6N5,ONTARIO,CANADA. LUND INST TECHNOL,DEPT MATH PHYS,S-22007 LUND,SWEDEN. RI Hauschild, Karl/A-6726-2009; radford, David/A-3928-2015 NR 10 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1994 VL 50 IS 1 BP 483 EP 486 DI 10.1103/PhysRevC.50.483 PG 4 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700057 ER PT J AU BRENNER, DS ZAMFIR, NV CASTEN, RF AF BRENNER, DS ZAMFIR, NV CASTEN, RF TI EVIDENCE FOR A SPHERICAL SUBSHELL AT N=164 SO PHYSICAL REVIEW C LA English DT Note ID EVEN-EVEN NUCLEI; P-FACTOR; SATURATION; VALUES; STRENGTHS; B(E2) AB The ratio of quadrupole deformation to the pairing gap parameter, epsilon/DELTA, is compared to the P factor in the actinide region. The results provide evidence for a persistent spherical subshell gap at N = 164. C1 INST ATOM PHYS,BUCHAREST,ROMANIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BRENNER, DS (reprint author), CLARK UNIV,WORCESTER,MA 01610, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 19 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1994 VL 50 IS 1 BP 490 EP 492 DI 10.1103/PhysRevC.50.490 PG 3 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700059 ER PT J AU STADLER, A GIBSON, BF AF STADLER, A GIBSON, BF TI CAN THE SIGMA-NN SYSTEM BE BOUND SO PHYSICAL REVIEW C LA English DT Note ID HYPERON-NUCLEON-INTERACTION; EXCHANGE-POTENTIAL APPROACH; BARYON-BARYON SCATTERING; INTERACTION MODELS; HYPERNUCLEI; HE-4(SIGMA); STATES; HE-4 AB Motivated by the SIGMA-hypernuclear states reported in (K-, pi+/-) experiments, we have explored the possibility that there exists a particle-stable SIGMA-nn bound state. For the Julich A hyperon-nucleon, realistic-force model, our calculations yield little reason to expect a positive-parity bound state or resonance in either the J = 1/2 or the J = 3/2 channels. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP STADLER, A (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185, USA. RI Stadler, Alfred/C-5550-2009 OI Stadler, Alfred/0000-0002-9596-0770 NR 27 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1994 VL 50 IS 1 BP 512 EP 513 DI 10.1103/PhysRevC.50.512 PG 2 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700065 ER PT J AU TOTH, KS AF TOTH, KS TI DECAYS AND MASSES OF TA-162,TA-163 AND SOME NEIGHBORING NUCLIDES - COMMENT SO PHYSICAL REVIEW C LA English DT Letter ID LU-157; ISOTOPES; TM-155; ISOMER RP TOTH, KS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 10 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1994 VL 50 IS 1 BP 518 EP 519 DI 10.1103/PhysRevC.50.518 PG 2 WC Physics, Nuclear SC Physics GA NZ567 UT WOS:A1994NZ56700067 ER PT J AU BEDDO, M BURLESON, G FAUCETT, JA GARDINER, S KYLE, G GARNETT, R GROSNICK, D HILL, D JOHNSON, K LOPIANO, D OHASHI, Y SHIMA, T SPINKA, H STANEK, R UNDERWOOD, D YOKOSAWA, A GLASS, G KENEFICK, R NATH, S NORTHCLIFFE, L JARMER, JJ PENTTILA, S JEPPESEN, R TRIPARD, G DEVEREUX, M KROLL, P AF BEDDO, M BURLESON, G FAUCETT, JA GARDINER, S KYLE, G GARNETT, R GROSNICK, D HILL, D JOHNSON, K LOPIANO, D OHASHI, Y SHIMA, T SPINKA, H STANEK, R UNDERWOOD, D YOKOSAWA, A GLASS, G KENEFICK, R NATH, S NORTHCLIFFE, L JARMER, JJ PENTTILA, S JEPPESEN, R TRIPARD, G DEVEREUX, M KROLL, P TI MEASUREMENT OF THE LONGITUDINAL SPIN-DEPENDENT NEUTRON-PROTON TOTAL CROSS-SECTION DIFFERENCE DELTA-SIGMA-L(NP) BETWEEN 500 AND 800-MEV SO PHYSICAL REVIEW D LA English DT Article ID DELTA-SIGMA-L; NUCLEON-NUCLEON-SCATTERING; ELASTIC ANALYZING POWER; PARTIAL-WAVE ANALYSIS; NN PHASE-SHIFTS; ENERGY-RANGE; PP SCATTERING; MESON THEORY; L NP; RESONANCE AB A measurement of DELTAsigma(L)(np), the difference between neutron-proton total cross sections for pure longitudinal spin states, is described. Data were taken at LAMPF for five neutron beam kinetic energies: 484, 568, 634, 720, and 788 MeV. The statistical errors are in the range 0.64-1.35 mb. Various sources of systematic effects were investigated and are described. Overall systematic errors are estimated to be on the order of 0.5 mb and include an estimate for the uncertainty in the neutron beam polarization. The DELTAsigma(L) results are consistent with previous results from PSI and Saclay. These data, when combined with other results and fitted to a Breit-Wigner curve, are consistent with an elastic I=0 resonance with mass 2214 +/- 15 (stat) +/- 6 (syst) MeV and width 75 +/- 21 +/- 12 MeV. Because of a lack of DELTAsigma(T)(np) data between 500 and 800 MeV, it is not possible to differentiate between a singlet or coupled-triplet partial wave being responsible. C1 NEW MEXICO STATE UNIV, LAS CRUCES, NM 88003 USA. TEXAS A&M UNIV, COLLEGE STN, TX 77843 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV MONTANA, MISSOULA, MT 59812 USA. WASHINGTON STATE UNIV, PULLMAN, WA 99164 USA. UNIV GESAMTHSCH WUPPERTAL, W-5600 WUPPERTAL 1, GERMANY. EARLHAM COLL, RICHMOND, IN 47374 USA. NR 96 TC 9 Z9 9 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 JUL 1 PY 1994 VL 50 IS 1 BP 104 EP 123 DI 10.1103/PhysRevD.50.104 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NW028 UT WOS:A1994NW02800014 ER PT J AU NARDI, E RIZZO, TG AF NARDI, E RIZZO, TG TI IDENTIFYING UNCONVENTIONAL E6 MODELS AT E+E- COLLIDERS SO PHYSICAL REVIEW D LA English DT Article ID CONSTRAINTS; BOSONS; BOUNDS AB Recently it was shown that, in the framework of superstring-inspired E6 models, the presence of generation-dependent discrete symmetries allows us to construct a phenomenologically viable class of models in which the three generations of fermions do not have the same embedding within the fundamental 27-dimensional representation of E6. In this scenario these different embedding of the conventional fermions imply that the left-handed charged leptons and the right-handed d-type quarks are coupled in a nonuniversal way to the new neutral gauge bosons (Z(theta)) present in these models. It was also shown that a unique signature for this scenario would be a deviation from unity for the ratio of cross sections for the production of two different lepton species in e+e- annihilation. However, several different scenarios are possible, depending on the particular assignment chosen for e(L), mu(L), and tau(L) and for the right-handed d-type quarks, as well as on the type of Z(theta) boson. Such scenarios cannot be disentangled from one another by means of cross section measurements alone. In this paper we examine the possibility of identifying the pattern of embeddings through measurements of polarized and unpolarized asymmetries for fermion pair production at the 500 GeV e+e- Next Linear Collider. We. show that it will be possible to identify the different patterns of unconventional assignments for the left-handed leptons and for the b(R) quark, for Z(theta) masses as large as approximately 1.5 TeV. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR,STANFORD,CA 94309. RP NARDI, E (reprint author), UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. OI Nardi, Enrico/0000-0001-7165-3808 NR 18 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1994 VL 50 IS 1 BP 203 EP 209 DI 10.1103/PhysRevD.50.203 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NW028 UT WOS:A1994NW02800018 ER PT J AU RIZZO, TG AF RIZZO, TG TI MODEL DEPENDENCE OF W(R) SEARCHES AT THE FERMILAB TEVATRON SO PHYSICAL REVIEW D LA English DT Article ID GAUGE-BOSON COUPLINGS; RIGHT-HANDED CURRENTS; PARTON DISTRIBUTIONS; HADRON COLLIDERS; MASS; PARAMETERS; SCATTERING; BOUNDS; SCALE; EP AB We explore the sensitivity of the ongoing Fermilab Tevatron search for charged, right-handed gauge bosons W(R)+/- to various model dependent assumptions such as the magnitude of the SU(2)R gauge coupling, the values of the right-handed Kobayashi-Maskawa mixing matrix elements (V(R))ij, and the nature of the right-handed neutrino. These results also have important implications for DESY HERA searches for right-handed currents. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 33 TC 21 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1994 VL 50 IS 1 BP 325 EP 330 DI 10.1103/PhysRevD.50.325 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NW028 UT WOS:A1994NW02800029 ER PT J AU ALBUQUERQUE, IF BONDAR, NF CARRIGAN, R CHEN, D COOPER, PSA DAI, LH 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 MORELOS, A NEWSOM, C MAIA, MCP SAMSONOV, VM SCHEGELSKY, VA SHI, HZ SMITH, VJ FUKUN, T TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA JIE, Y ZHAO, WH ZHENG, SC ZHONG, YY AF ALBUQUERQUE, IF BONDAR, NF CARRIGAN, R CHEN, D COOPER, PSA DAI, LH 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 MORELOS, A NEWSOM, C MAIA, MCP SAMSONOV, VM SCHEGELSKY, VA SHI, HZ SMITH, VJ FUKUN, T TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA JIE, Y ZHAO, WH ZHENG, SC ZHONG, YY TI NEW UPPER LIMIT FOR THE BRANCHING RATIO OF THE OMEGA--]EQUIVALENT-TO-GAMMA RADIATIVE DECAY SO PHYSICAL REVIEW D LA English DT Note AB We have searched for the rare hyperon radiative decay OMEGA- --> XI- gamma, using the Fermilab Proton Center 375 GeV/c charged hyperon beam. our measurement of the OMEGA- beam fraction at 13.6 m from production is (4.8 +/- 0.4)X 10(-5). No signal was found and we determine a new upper limit of 4.6 X 10(-4) at 90% C.L. for the OMEGA- --> XI- gamma branching ratio. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. UNIV IOWA,IOWA CITY,IA 52242. SUNY ALBANY,ALBANY,NY 12222. CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. PETERSBURG NUCL PHYS INST,GATCHINA,RUSSIA. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA. UNIV FED PARAIBA,PARAIBA,BRAZIL. CONSELHO NACL PESQUISAS CNPQ,RIO JANEIRO,BRAZIL. YALE UNIV,J W GIBBS LAB,NEW HAVEN,CT 06511. RP ALBUQUERQUE, IF (reprint author), UNIV SAO PAULO,SAO PAULO,BRAZIL. RI Albuquerque, Ivone/H-4645-2012; Gouffon, Philippe/I-4549-2012 OI Albuquerque, Ivone/0000-0001-7328-0136; Gouffon, Philippe/0000-0001-7511-4115 NR 7 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1994 VL 50 IS 1 BP R18 EP R20 DI 10.1103/PhysRevD.50.R18 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NW028 UT WOS:A1994NW02800005 ER PT J AU BAUER, DA BELCINSKI, R BERG, RC BINGHAM, HH BLOOM, ED BUCHANAN, CD CALDWELL, DO CHUN, SB CLARK, AR DAHL, OI EASTMAN, JJ EBERHARD, PH EISNER, AM FAIRFIELD, KH GODFREY, G GREENBAUM, GS HAUPTMAN, JM HOFMANN, W HOLTZAPPLE, RL KHACHERYAN, S KNOPFLE, KT KOFLER, RR LAMBERT, DJ LOKEN, SC LU, A LYNCH, GR LYS, JE MADARAS, RJ MARSISKE, H MASEK, GE MILLER, ES NICOL, NA NYGREN, DR OYANG, YT PAAR, HP PALOUNEK, APT PELLETT, DE RONAN, MT ROSS, RR SHAPIRO, G STEPHENS, RW STEVENSON, ML STRAUSS, MG SULLIVAN, MK VERNON, W WANG, EM WANG, YX WENZEL, WA YAMAMOTO, H YELLIN, SJ YOST, GP ZAPALAC, G AF BAUER, DA BELCINSKI, R BERG, RC BINGHAM, HH BLOOM, ED BUCHANAN, CD CALDWELL, DO CHUN, SB CLARK, AR DAHL, OI EASTMAN, JJ EBERHARD, PH EISNER, AM FAIRFIELD, KH GODFREY, G GREENBAUM, GS HAUPTMAN, JM HOFMANN, W HOLTZAPPLE, RL KHACHERYAN, S KNOPFLE, KT KOFLER, RR LAMBERT, DJ LOKEN, SC LU, A LYNCH, GR LYS, JE MADARAS, RJ MARSISKE, H MASEK, GE MILLER, ES NICOL, NA NYGREN, DR OYANG, YT PAAR, HP PALOUNEK, APT PELLETT, DE RONAN, MT ROSS, RR SHAPIRO, G STEPHENS, RW STEVENSON, ML STRAUSS, MG SULLIVAN, MK VERNON, W WANG, EM WANG, YX WENZEL, WA YAMAMOTO, H YELLIN, SJ YOST, GP ZAPALAC, G TI MEASUREMENT OF THE KAON CONTENT OF 3-PRONG TAU-DECAYS SO PHYSICAL REVIEW D LA English DT Note ID LEPTONS AB We present branching fraction measurements of three-prong decays of the tau- lepton based on data from the TPC/Two-Gamma detector at SLAC PEP. The decays are classified according to the identities of the charged tracks to give simultaneous measurements of B[tau- --> nu(tau)K-pi+pi-]=0.58(-0.13)+0.15% and B[tau- --> nu(tau)K-K+pi-]=0.15+0.15(-0.07)+0.09)%, and upper limits of B[tau- --> nu(tau)pi-K+pi-]<0.25% B[tau- --> nu(tau)K-pi+K-]<0.09%, and B[tau- --> nu(tau)K-K+K-]<0.21%, where additional neutrals may be present in each case. The branching fractions are normalized to the world average three-prong topological branching fraction and there is an estimated 20% systematic error in addition to the listed statistical errors. We find the mass distributions in the K-pi+pi- decay are consistent with K1 dominance, and obtain branching fractions of B[tau- --> nu(tau)K1-(1270)]=0.41(-0.35)+0.41% and B[tau- --> nu(tau)K1-(1400)]=0.76(-0.33)+0.40% C1 UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. 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 CALIF INTERCAMPUS INST RES PARTICLE ACCELERATORS,STANFORD,CA 94305. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV MASSACHUSETTS,AMHERST,MA 01003. MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. RP BAUER, DA (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 13 TC 19 Z9 19 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1994 VL 50 IS 1 BP R13 EP R17 DI 10.1103/PhysRevD.50.R13 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NW028 UT WOS:A1994NW02800004 ER PT J AU MISHRA, CS BROWN, CN COOPER, WE GOUDNER, K KAPLAN, DM MARTIN, VM PRESTON, RS SA, J TANIKELLA, V ISENHOWER, LD SADLER, ME SCHNATHORST, R LEDERMAN, LM SCHUB, MH GIDAL, G KOWITT, MS LUK, KB CAREY, TA JEPPESEN, RE KAPUSTINSKY, JS LANE, DW LEITCH, MJ LILLBERG, JW MCGAUGHEY, PL MOSS, JM PENG, JC CHILDERS, RL DARDEN, CW TENG, PK AF MISHRA, CS BROWN, CN COOPER, WE GOUDNER, K KAPLAN, DM MARTIN, VM PRESTON, RS SA, J TANIKELLA, V ISENHOWER, LD SADLER, ME SCHNATHORST, R LEDERMAN, LM SCHUB, MH GIDAL, G KOWITT, MS LUK, KB CAREY, TA JEPPESEN, RE KAPUSTINSKY, JS LANE, DW LEITCH, MJ LILLBERG, JW MCGAUGHEY, PL MOSS, JM PENG, JC CHILDERS, RL DARDEN, CW TENG, PK TI SEARCH FOR THE DECAY D0[-MU+MU- SO PHYSICAL REVIEW D LA English DT Note ID S = 27.4; MESON PRODUCTION; NEUTRAL CURRENTS; UPPER LIMIT; 800 GEV/C; DEPENDENCE; COLLISIONS; PP AB Using a silicon-microstrip detector array to identify secondary vertices occurring downstream of a short platinum target, we have searched for the decay D0-->mu+mu-. Normalized relative to the j/psi-->mu+mu- signal observed in the same data sample, for a 3.25-mm minimum decay distance our branching-ratio sensitivity is (4.8 +/- 1.4)X 10(-6) per event, and after background subtraction we observe -4.1 +/- 4.8 events. Using the statistical approach advocated by the Particle Data Group, we obtain a limit B(D0-->mu+mu-)<3.1 X 10(-5) at 90% confidence, confirming with a different technique the limit previously obtained by Louis et al. The interpretation of the upper limit involves complex statistical issues; we present another approach which is more suitable for combining the results of different experiments. C1 NO ILLINOIS UNIV,DE KALB,IL 60115. ABILENE CHRISTIAN UNIV,ABILENE,TX 79699. UNIV CHICAGO,CHICAGO,IL 60637. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV S CAROLINA,COLUMBIA,SC 29208. ACAD SINICA,INST PHYS,TAIPEI 115,TAIWAN. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP MISHRA, CS (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 32 TC 5 Z9 6 U1 2 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 JUL 1 PY 1994 VL 50 IS 1 BP R9 EP R12 DI 10.1103/PhysRevD.50.R9 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NW028 UT WOS:A1994NW02800003 ER PT J AU SNYDER, SC REYNOLDS, LD FINCKE, JR LASSAHN, GD GRANDY, JD REPETTI, TE AF SNYDER, SC REYNOLDS, LD FINCKE, JR LASSAHN, GD GRANDY, JD REPETTI, TE TI ELECTRON-TEMPERATURE AND ELECTRON-DENSITY PROFILES IN ATMOSPHERIC-PRESSURE ARGON PLASMA-JET SO PHYSICAL REVIEW E LA English DT Article ID ARC PLASMA; LASER; SCATTERING AB Line-shape analysis of the electron feature of Thomson-scattered laser light has been used to directly determine electron-temperature and electron-density profiles of an atmospheric-pressure argon plasma jet. Measured center line values of the electron temperature are in excess of 20000 K at the torch exit, and remain essentially constant with increasing axial distance even though the plasma is recombining. These results are shown to be inconsistent with Saha equilibrium and classical electron-ion momentum transfer theory. RP SNYDER, SC (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 25 TC 34 Z9 35 U1 1 U2 8 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 JUL PY 1994 VL 50 IS 1 BP 519 EP 525 DI 10.1103/PhysRevE.50.519 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NZ084 UT WOS:A1994NZ08400067 ER PT J AU ROSENZWEIG, JB CHEN, PS AF ROSENZWEIG, JB CHEN, PS TI TRANSVERE EQUILIBRIA AND LUMINOSITY ENHANCEMENT IN LINEAR COLLIDER BEAM-BEAM COLLISIONS SO PHYSICAL REVIEW E LA English DT Article ID ELECTRON-BEAM; DYNAMICS AB It has been observed in simulations of the beam-beam interaction in linear colliders that a near-equilibrium pinched state of the colliding beams develops when the disruption parameter is large (D much greater than 1) [P. Chen and K. Yokoya, Phys. Rev. D 38, 987 (1988); in Frontiers of Particle Beams: Intensity Limitations, edited by M. Dienes, Lecture Notes in Physics Vol, 400 (Springer-Verlag, Berlin, 1992), p. 415]. In this state the beam transverse density distributions are peaked at center, with long tails. We present here an analytical model of the Maxwell-Vlasov equilibrium approached by the beams, that of a generalized Bennett pinch [W. H. Bennett, Phys. Rev. 45, 890 (1934); 98, 1584 (1955)] which develops through collisionless damping due to the strong nonlinearity of the beam-beam interaction. In order to calculate the equilibrium pinched beam size, an estimation of the rms emittance growth is made which takes into account the effects of the initial linear rise of the focusing forces, and of phase-space mismatch during the beam-beam collision. This pinched beam size is used to derive the luminosity enhancement factors whose scaling as a function of D and thermal factor A = sigma(z)/beta* is in agreement with the simulation results, and explain the previously noted cubic relationship between round and flat beam enhancement factors. The implications for calculation of differential luminosity, beamstrahlung spectra, and associated coherent beam-beam radiation effects, are discussed. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP ROSENZWEIG, JB (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,405 HILGARD AVE,LOS ANGELES,CA 90024, USA. NR 15 TC 1 Z9 1 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUL PY 1994 VL 50 IS 1 BP 526 EP 531 DI 10.1103/PhysRevE.50.526 PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NZ084 UT WOS:A1994NZ08400068 ER PT J AU MINEEVWEINSTEIN, MB DAWSON, SP AF MINEEVWEINSTEIN, MB DAWSON, SP TI CLASS OF NONSINGULAR EXACT-SOLUTIONS FOR LAPLACIAN PATTERN-FORMATION SO PHYSICAL REVIEW E LA English DT Note ID HELE-SHAW CELLS; VISCOUS-FINGERING PATTERNS; INTERFACE DYNAMICS; POROUS-MEDIA; FLOW; INSTABILITY; AGGREGATION; GROWTH AB We present a class of exact solutions for the so-called Laplacian growth equation describing the zero-surface-tension limit of a variety of two-dimensional pattern formation problems. These solutions are free of finite-time singularities (cusps) for quite general initial conditions. They reproduce various features of viscous fingering observed in experiments and numerical simulations with surface tension, such as existence of stagnation points, screening, tip splitting, and cooarsening. In certain cases the asymptotic interface consists of N separated moving Saffman-Taylor fingers. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP MINEEVWEINSTEIN, MB (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS-B258,LOS ALAMOS,NM 87545, USA. NR 31 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUL PY 1994 VL 50 IS 1 BP R24 EP R27 DI 10.1103/PhysRevE.50.R24 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NZ084 UT WOS:A1994NZ08400007 ER PT J AU CORDIER, P GRATZ, AJ DOUKHAN, JC NELLIS, WJ AF CORDIER, P GRATZ, AJ DOUKHAN, JC NELLIS, WJ TI MICROSTRUCTURES OF ALPO4 SUBJECTED TO HIGH SHOCK PRESSURES SO PHYSICS AND CHEMISTRY OF MINERALS LA English DT Article DE BERLINITE; EXPERIMENTAL SHOCK; AMORPHIZATION; TEM ID TRANSMISSION ELECTRON-MICROSCOPY; PLANAR DEFORMATION FEATURES; BERLINITE ALPO4; INDUCED AMORPHIZATION; QUARTZ; METAMORPHISM; TEMPERATURE; TRANSITION; MEMORY; SOLIDS AB Berlinite single crystal specimens were shocked to peak pressures 12 and 24 GPa. Specimens were placed in an Al capsule to minimize shock-wave reflections at interfaces between specimen and capsule. Shock pressures were achieved with a 6.5-m-long two-stage gun. The shock-induced microstructures in recovered specimens were then investigated by Transmission Electron Microscopy. In the sample shocked at 12 GPa, the prominent shock-induced defects are dislocations and basal a glide appears to be the only glide system activated. In contrast, the sample shocked at 24 GPa exhibits no dislocations. The material is partially converted into an amorphous phase occurring under the form of thin amorphous lamellae parallel to the {101nBAR} planes (n = 0, 2, 3, 4). This microstructure is very similar to the one observed in experimentally shocked quartz. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,H DIV,LIVERMORE,CA 94550. RP CORDIER, P (reprint author), UNIV LILLE 1,STRUCT & PROPRIETES ETAT SOLIDE LAB,CNRS,UA 234,F-59655 VILLENEUVE DASCQ,FRANCE. RI Cordier, Patrick/D-2357-2012 OI Cordier, Patrick/0000-0002-1883-2994 NR 26 TC 11 Z9 11 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0342-1791 J9 PHYS CHEM MINER JI Phys. Chem. Miner. PD JUL PY 1994 VL 21 IS 3 BP 133 EP 139 DI 10.1007/BF00203143 PG 7 WC Materials Science, Multidisciplinary; Mineralogy SC Materials Science; Mineralogy GA NW992 UT WOS:A1994NW99200002 ER PT J AU HULET, EK AF HULET, EK TI ROLE OF THE 2ND BARRIER UPON MASS DIVISION IN THE SPONTANEOUS FISSION OF THE HEAVIEST ELEMENTS SO PHYSICS OF ATOMIC NUCLEI LA English DT Article ID HALF-LIVES; SYSTEMATICS; ISOTOPES; NUCLEI AB In the region where theorists had earlier predicted the disappearance of the outer fission barrier or its dropping below the ground state, the mass and total kinetic-energy distributions from spontaneous fission of No-252, No-254, 256[104], and 258[104] have been measured. The results, in combination with earlier measurements for No-256, No-258, and No-262, show a sharp transition from the asymmetrical mass division in No-256 to the symmetrical mass division for No-258 and No-262. Conversely, all isotopes of element 104, including 260[104], appear to yield broadly symmetrical mass distributions. The total kinetic energies around 200 MeV for the 104 isotopes indicate the fission by the low-energy mode of bimodal fission. Based on the hypothesis that the second barrier is responsible for the asymmetrical mass distributions, and when it disappears, for symmetrical ones, these observations for the isotopes of element 104 are in agreement with the 1976 calculations of the heights of the second fission barrier relative to the ground state. Some recent calculations of static potential-energy surfaces and of barrier heights deduced from half lives for spontaneous fission indicate that the second barrier is from 0 to 2.9 MeV above the ground state for the No and 104 isotopes. However, shape degrees of freedom have been limited in these calculations; therefore, they fail to provide realistic heights for the outer fission barrier. For the few cases where higher-order asymmetrical deformations are included, this barrier height is well below the ground state and, for these nuclides, symmetric mass division only is observed. Without more extensive calculations of potential-energy surfaces for comparison with the findings, a firm conclusion about the role of the second barrier upon mass division in fission is impossible to obtain. RP HULET, EK (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 37 TC 18 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD JUL PY 1994 VL 57 IS 7 BP 1099 EP 1107 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PC296 UT WOS:A1994PC29600002 ER PT J AU KLIMAN, J POLHORSKY, V MORHAC, M TERAKOPIAN, GM OGANESSIAN, YT POPEKO, GS DANIEL, AV HAMILTON, JH BUTLERMOORE, K RAMAYYA, AV MAR, WC ZHAO, X LU, Q SHI, D DENG, JK KORMICKI, J ZHU, S COLE, JD ARYAEINEJAD, R GREENWOOD, RC HARRILL, SS LOHSTRETER, ND LEE, IY JOHNSON, NR MCGOWAN, FK AF KLIMAN, J POLHORSKY, V MORHAC, M TERAKOPIAN, GM OGANESSIAN, YT POPEKO, GS DANIEL, AV HAMILTON, JH BUTLERMOORE, K RAMAYYA, AV MAR, WC ZHAO, X LU, Q SHI, D DENG, JK KORMICKI, J ZHU, S COLE, JD ARYAEINEJAD, R GREENWOOD, RC HARRILL, SS LOHSTRETER, ND LEE, IY JOHNSON, NR MCGOWAN, FK TI CORRELATED YIELDS AND THE EMISSION OF NEUTRONS OF MO/BA FRAGMENTS FROM CF-252(SF) SO PHYSICS OF ATOMIC NUCLEI LA English DT Article AB Some preliminary results of one [1] of the four [2] experiments carried out at the Holifield Heavy-Ion Research facility with the 20-Compton suppressed Ge detector close-packed ball are presented. As a result of reduction procedures on the gamma-gamma matrices, the set of independent yields of correlated pairs of fission fragments for the charge division Z(L)/Z(H) = 42/56 (Mo/Ba) is presented. A preliminary value of the mean neutron multiplicity nu(Mo/Ba)BAR = 4.0 +/- 0.1 and a probability distribution of the neutron multiplicity up to 10 emitted prompt neutrons was also obtained for this charge division. C1 JOINT NUCL RES INST,MOSCOW,RUSSIA. TSING HUA UNIV,DEPT PHYS,BEIJING,PEOPLES R CHINA. IDAHO NATL ENGN LAB,IDAHO FALLS,ID. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37240. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KLIMAN, J (reprint author), ACAD SCI SLOVAKIA,INST PHYS,BRATISLAVA,SLOVAKIA. NR 7 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 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD JUL PY 1994 VL 57 IS 7 BP 1108 EP 1111 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PC296 UT WOS:A1994PC29600003 ER PT J AU LESTONE, JP GAVRON, A AF LESTONE, JP GAVRON, A TI NEUTRON-INDUCED FISSION OF URANIUM ISOTOPES UP TO 100 MEV SO PHYSICS OF ATOMIC NUCLEI LA English DT Article ID NUCLEI; MODEL AB The statistical-model description of the neutron-induced fission of U isotopes has been developed using densities of intrinsic states and spin cutoff parameters obtained directly from appropriate Nilsson model single-particle levels. The first-chance fission cross sections are reproduced well when the rotational contributions to the nuclear level densities are taken into account. In order to fit the U(n,f) cross sections above the threshold of second-chance fission, we must: (1) assume that the triaxial level-density enhancement is washed out at an excitation energy of approximately 7 MeV above the triaxial barriers with a width of approximately 1 MeV, implying a gamma deformation for the first barriers where 10 < gamma < 20-degrees, and (2) include preequilibrium particle emission in the calculations. Above an incoming-neutron kinetic energy of approximately 17 MeV, our statistical model U(n,f) of cross sections increasingly overestimates the experimental data. This is not surprising since, at these high energies, little data exist on the scattering of neutrons to help guide the choice of optical-model parameters. A satisfactory reproduction of all of the available U(n,f) cross sections above 17 MeV is obtained by scaling our calculated compound-nucleus formation cross sections. This scaling factor falls from 1.0 at 17 MeV to 0.82 at 100 MeV. RP LESTONE, JP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 31 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD JUL PY 1994 VL 57 IS 7 BP 1200 EP 1206 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PC296 UT WOS:A1994PC29600020 ER PT J AU ANDERSON, CR REIDER, MB AF ANDERSON, CR REIDER, MB TI INVESTIGATION OF THE USE OF PRANDTL NAVIER-STOKES EQUATION PROCEDURES FOR 2-DIMENSIONAL INCOMPRESSIBLE FLOWS SO PHYSICS OF FLUIDS LA English DT Article ID BOUNDARY-LAYER; GENERATION AB The technique of combining solutions of the Prandtl equations with solutions of the Navier-Stokes equations to compute incompressible flow around two-dimensional bodies is investigated herein. Computational evidence is presented which shows that if the ''obvious'' coupling is used to combine the solutions, then the resulting solution is not accurate. An alternate coupling procedure is described which greatly improves the accuracy of the solutions obtained with the combined equation approach. An alternate coupling that can be used to create a more accurate vortex sheet/vortex blob method is then shown. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP ANDERSON, CR (reprint author), IBM CORP,RES DIV,TJ WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JUL PY 1994 VL 6 IS 7 BP 2380 EP 2389 DI 10.1063/1.868187 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NU225 UT WOS:A1994NU22500014 ER PT J AU STEWART, DS ASAY, BW PRASAD, K AF STEWART, DS ASAY, BW PRASAD, K TI SIMPLIFIED MODELING OF TRANSITION TO DETONATION IN POROUS ENERGETIC MATERIALS SO PHYSICS OF FLUIDS LA English DT Article ID 2-PHASE DETONATION; DEFLAGRATION; COMPACTION; FLOW AB A simplified model that can predict the transitions from compaction to detonation and shock to detonation is given with the aim of describing experiments in beds of porous HMX. In the case of compaction to detonation, the energy of early impact generates a slowly moving, convective-reactive deflagration that expands near the piston face and evolves in a manner that is characteristic of confined deflagration to detonation transition. A single-phase state variable theory is adopted in contrast to a two-phase axiomatic mixture theory. The ability of the porous material to compact is treated as an endothermic process. Reaction is treated as an exothermic process. The algebraic (Rankine-Hugoniot) steady wave analysis is given for inert compaction waves and steady detonation waves in a piston supported configuration, typical of the experiments carried out in porous HMX. A structure analysis of the steady compaction wave is given. Numerical simulations of deflagration to detonation are carried out for parameters that describe an HMX-like material and compared with the experiments. The simple model predicts the high density plug that is observed in the experiments and suggests that the leading front of the plug is a secondary compaction wave. A shock to detonation transition is also numerically simulated. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. YALE UNIV,NEW HAVEN,CT 06520. RP STEWART, DS (reprint author), UNIV ILLINOIS,URBANA,IL 61801, USA. NR 26 TC 11 Z9 11 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JUL PY 1994 VL 6 IS 7 BP 2515 EP 2534 DI 10.1063/1.868140 PG 20 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NU225 UT WOS:A1994NU22500027 ER PT J AU PETRAVIC, M AF PETRAVIC, M TI SIMULATION OF ULTRAHIGH RECYCLING DIVERTORS FOR TOKAMAKS SO PHYSICS OF PLASMAS LA English DT Article ID PLASMAS AB The handling of power carried by the charged particles into the scrape-off layer of a tokamak reactor remains a major obstacle for its continuous and reliable operation. Ways of reducing this power through radiation have been studied numerically using fluid models for both the plasma and neutral gas. A new model for the combined plasma and neutral gas transport in two dimensions capable of simultaneously representing regions of fully ionized plasma, partially ionized plasma, and pure neutral gas has been assembled and implemented in the PLANET code [J. Nucl Mat. 196/198, 883 (1992)]. Divertor plasma temperatures of just below 1 eV have been achieved in a pure hydrogen plasma, resulting in an ionization-free region together with ionization and recombination fronts detached from the material walls. In this regime energy reaches the walls almost exclusively in the form of radiation which, in principle, solves the divertor heat load problems. RP PETRAVIC, M (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 17 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUL PY 1994 VL 1 IS 7 BP 2207 EP 2212 DI 10.1063/1.870620 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900014 ER PT J AU WALTZ, RE KERBEL, GD MILOVICH, J AF WALTZ, RE KERBEL, GD MILOVICH, J TI TOROIDAL GYRO-LANDAU FLUID MODEL TURBULENCE SIMULATIONS IN A NONLINEAR BALLOONING MODE REPRESENTATION WITH RADIAL MODES SO PHYSICS OF PLASMAS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; POLOIDAL FLOW GENERATION; DRIFT WAVE TURBULENCE; SHEARED FLOWS; TRANSPORT; TOKAMAK; INSTABILITY; GEOMETRY; ROTATION; PLASMA AB The method of Hammett and Perkins [Phys. Rev. Lett. 64, 3019 (1990)] to model Landau damping has been recently applied to the moments of the gyrokinetic equation with curvature drift by Waltz, Dominguez, and Hammett [Phys. Fluids B 4, 3138 (1992)]. The higher moments are truncated in terms of the lower moments (density, parallel velocity, and parallel and perpendicular pressure) by modeling the deviation from a perturbed Maxwellian to fit the kinetic response function at all values of the kinetic parameters: k\\v(th)/omega, b = (k perpendicular-to rho)2/2, and omega(D)/omega. Here the resulting gyro-Landau fluid equations are applied to the simulation of ion temperature gradient (ITG) mode turbulence in toroidal geometry using a novel three-dimensional (3-D) nonlinear ballooning mode representation. The representation is a Fourier transform of a field line following basis (k(y)',k(x)',z') with periodicity in toroidal and poloidal angles. Particular emphasis is given to the role of nonlinearly generated n = 0 (k(y)' = 0, k(x)' not-equal 0) ''radial modes'' in stabilizing the transport from the finite-n ITG ballooning modes. Detailing the parametric dependence of toroidal ITG turbulence is a key result. C1 LAWRENCE LIVERMORE NATL LAB,NERSC,LIVERMORE,CA 94550. RP WALTZ, RE (reprint author), GEN ATOM,POB 85608,SAN DIEGO,CA 92186, USA. NR 44 TC 354 Z9 356 U1 1 U2 18 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUL PY 1994 VL 1 IS 7 BP 2229 EP 2244 DI 10.1063/1.870934 PG 16 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900017 ER PT J AU TAKAHASHI, H AF TAKAHASHI, H TI THE GENERALIZED ACCESSIBILITY AND SPECTRAL GAP OF LOWER-HYBRID WAVES IN TOKAMAKS SO PHYSICS OF PLASMAS LA English DT Article ID DENSITY-FLUCTUATIONS; CURRENT-DRIVE; PROPAGATION; TEMPERATURE; SCATTERING; SIMULATION; TURBULENCE; PLASMA; LIMIT AB The generalized accessibility of lower hybrid waves, which may include shifting of the parallel refractive index (n(parallel-to)), either upward or downward, is investigated, using the cold plasma dispersion relation and various geometrical constraint (GC) relations imposed on the behavior of n(parallel-to). It is shown that n(parallel-to) upshifting is bounded and can be insufficient to bridge a large spectral gap to cause wave damping, if the GC relation does not allow the oblique resonance to occur. The traditional n(parallel-to) upshift mechanism based upon the pitch angle of magnetic field lines is shown to lead to contradictions with experimental observations. An upshift mechanism brought about by the density gradient along field lines is proposed, which is not inconsistent with experimental observations, and provides plausible explanations to some unresolved issues of lower hybrid wave theory, including generation of 'seed electrons.' RP TAKAHASHI, H (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 48 TC 17 Z9 17 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUL PY 1994 VL 1 IS 7 BP 2254 EP 2276 DI 10.1063/1.870624 PG 23 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900019 ER PT J AU HIRSHMAN, SP LEE, DK LEVINTON, FM BATHA, SH OKABAYASHI, M WIELAND, RM AF HIRSHMAN, SP LEE, DK LEVINTON, FM BATHA, SH OKABAYASHI, M WIELAND, RM TI EQUILIBRIUM RECONSTRUCTION OF THE SAFETY FACTOR PROFILE IN TOKAMAKS FROM MOTIONAL STARK-EFFECT DATA SO PHYSICS OF PLASMAS LA English DT Article ID MAGNETIC-FIELD AB The motional Stark effect (MSE) diagnostic has been used to obtain accurate measurements of the internal magnetic pitch angle tan-1(B(Z)/B(T)) in finite-pressure tokamaks. The MSE data, together with external magnetic probe data, are used to reconstruct self-consistently the equilibrium safety factor (q) profile and, hence, the plasma current density, in the Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Nucl. Fusion Res. 1, 51 (1986)] and the Princeton Beta Experiment-Modified (PBX-M) tokamak [Phys. Fluids B 2, 1271 (1990)]. An efficient computational scheme, based on an inverse coordinate representation of the magnetic field, has been developed to solve the coupled nonlinear equations describing both the magnetohydrodynamic (MHD) equilibrium and the q profile, which best match all the experimental data. C1 FUS PHYS & TECHNOL,TORRANCE,CA 90503. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP HIRSHMAN, SP (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 23 TC 41 Z9 41 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUL PY 1994 VL 1 IS 7 BP 2277 EP 2290 DI 10.1063/1.870625 PG 14 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900020 ER PT J AU LAFONTAINE, B BALDIS, HA VILLENEUVE, DM DUNN, J ENRIGHT, GD KIEFFER, JC PEPIN, H ROSEN, MD MATTHEWS, DL MAXON, S AF LAFONTAINE, B BALDIS, HA VILLENEUVE, DM DUNN, J ENRIGHT, GD KIEFFER, JC PEPIN, H ROSEN, MD MATTHEWS, DL MAXON, S TI CHARACTERIZATION OF LASER-PRODUCED PLASMAS BY ULTRAVIOLET THOMSON SCATTERING SO PHYSICS OF PLASMAS LA English DT Article ID X-RAY LASER; INVERSE BREMSSTRAHLUNG; ELECTRON; TIME; AMPLIFICATION; ACCELERATION; TEMPERATURE; FREQUENCY; WAVES; MODEL AB Space-time-resolved Thomson scattering was used to characterize the electron and ion temperatures in laser produced plasmas of various atomic numbers (Z = 6, 13, 32, 73, 92). A Nd:glass laser with intensity between 10(13) and 5 X 10(14) W/cm2 was used to produce plasmas of relevance to laser fusion and x-ray laser studies. A comparison of the electron temperature and density deduced from Thomson scattering, x-ray spectroscopy, and LASNEX hydrocode simulations is presented. C1 INST NATL RECH SCI,VARENNES J3X 1S2,PQ,CANADA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LAFONTAINE, B (reprint author), NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. RI Villeneuve, David/I-4140-2012 OI Villeneuve, David/0000-0002-2810-3648 NR 37 TC 37 Z9 37 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUL PY 1994 VL 1 IS 7 BP 2329 EP 2341 DI 10.1063/1.870630 PG 13 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900025 ER PT J AU PAIK, SH NGUYEN, HD AF PAIK, SH NGUYEN, HD TI MOMENTUM AND HEAT-TRANSFER OF A TRANSLATING LIQUID DROPLET UNDER A THERMAL PLASMA ENVIRONMENT SO PHYSICS OF PLASMAS LA English DT Article ID REYNOLDS-NUMBERS; FLOW; EVAPORATION; SPHERE AB Momentum and heat transfer associated with a translating liquid droplet with/without mass efflux from the droplet surface in a quiescent argon thermal plasma environment is studied. A Chebyshev-Legendre spectral method with a fractional time stepping method is expanded to treat the compressible nature of the thermal plasma flow as well as the internal droplet incompressible flow. Steady-state solutions for the case of plasma flow over a constant temperature solid sphere and incompressible flow over a droplet without mass efflux from the droplet are calculated and compared with previously published results. The interfacial phenomena are studied with interfacial physical properties. Transient solutions with droplet internal motion and convective heat transfer with/without mass efflux from the sphere surface are presented. Results indicate that uniform droplet internal temperature is established more quickly than that of a solid sphere in the plasma environment for no mass efflux case. Also, a symmetric interfacial velocity distribution develops along the droplet interface as Reynolds number increases. In case of mass efflux from the sphere, results show that the drag force and heat transfer rate are reduced in the presence of radial mass efflux at the droplet surface. RP PAIK, SH (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 17 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUL PY 1994 VL 1 IS 7 BP 2383 EP 2397 DI 10.1063/1.870566 PG 15 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900030 ER PT J AU BROWN, G ELLIS, P OSNES, E STROTTMAN, D AF BROWN, G ELLIS, P OSNES, E STROTTMAN, D TI REALISTIC NUCLEAR-STRUCTURE - ON THE OCCASION OF KUO,T.T.S. 60TH BIRTHDAY .1. PREFACE SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Editorial Material C1 UNIV MINNESOTA,MINNEAPOLIS,MN 55455. UNIV OSLO,OSLO 3,NORWAY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BROWN, G (reprint author), SUNY STONY BROOK,STONY BROOK,NY 11794, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1994 VL 242 IS 1-3 BP 3 EP 4 DI 10.1016/0370-1573(94)90138-4 PG 2 WC Physics, Multidisciplinary SC Physics GA NZ224 UT WOS:A1994NZ22400001 ER PT J AU WARBURTON, EK TOWNER, IS AF WARBURTON, EK TOWNER, IS TI NUCLEAR MEDIUM EFFECTS IN 1ST FORBIDDEN BETA-DECAY SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Article; Proceedings Paper CT International Conference on Realistic Nuclear Structure, to Celebrate the 60th Birthday of TTS (TOM) Kuo CY MAY 28-30, 1992 CL SUNY STONY BOOK, PHYS DEPT, STONY BROOK, NY HO SUNY STONY BOOK, PHYS DEPT ID AXIAL-CHARGE TRANSITIONS; MESON-EXCHANGE CURRENTS; LEAD REGION; MATRIX-ELEMENTS; ENHANCEMENT; LAGRANGIANS; MODEL AB Two years ago, a comparison of shell-model predictions with experimental data for first-forbidden beta decays in the lead region revealed that the weak rank-zero axial-charge matrix element is enhanced over the inpulse approximation value by approximately 100% as opposed to approximately 60% in light nuclei. This result was considerably larger than the approximately 50% enhancement that had been expected from pion-exchange processes alone and led to considerable theoretical activity. Proposed reasons for the large enhancement include (i) medium modifications of the nucleon mass and pion-decay constant from their free-space values, which can magnify the already-large pion-exchange processes, and (ii) a weakening of the tensor force in the shell-model effective interaction, which has an important role in core-polarization contributions to the beta-decay matrix element. A reanalysis of the A approximately 208 decay rates utilizing a recent evaluation of the meson-exchange process is described. Fairly good agreement with experiment is now achieved. The status of other proposed medium renormalizations is reviewed. C1 AECL RES,CHALK RIVER LABS,CHALK RIVER K0J 1J0,ON,CANADA. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 36 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1994 VL 242 IS 1-3 BP 103 EP 118 DI 10.1016/0370-1573(94)90144-9 PG 16 WC Physics, Multidisciplinary SC Physics GA NZ224 UT WOS:A1994NZ22400007 ER PT J AU HOCH, T MADLAND, D MANAKOS, P MANNEL, T NIKOLAUS, BA STROTTMAN, D AF HOCH, T MADLAND, D MANAKOS, P MANNEL, T NIKOLAUS, BA STROTTMAN, D TI RELATIVISTIC INTERACTIONS AND REALISTIC APPLICATIONS SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Article; Proceedings Paper CT Conference on Realistic Nuclear Structure, to Honour T T S Kuo at the Occasion of His 60th Birthday CY MAY 28-30, 1992 CL STONY BROOK, NY ID MODELS AB A four-fermion coupling Lagrangian (relativistic Skyrme-type) interaction has been proposed for relativistic nuclear structure calculations. This interaction which has the merit of simplicity is from the outset tailored as an effective interaction for relativistic Hartree-Fock calculations. Various extensions of such a model are discussed and compared with Walecka's meson-nucleon mean field approach. We also present results of the calculation of nuclear ground state properties with an extended (density dependent) version of the four-fermion interaction in a relativistic Hartree-Fock approximation. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP HOCH, T (reprint author), TH DARMSTADT,INST KERNPHYS,W-6100 DARMSTADT,GERMANY. NR 12 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1994 VL 242 IS 4-6 BP 253 EP 259 DI 10.1016/0370-1573(94)90161-9 PG 7 WC Physics, Multidisciplinary SC Physics GA NZ939 UT WOS:A1994NZ93900003 ER PT J AU FENG, DH WANG, RP AF FENG, DH WANG, RP TI NUCLEAR-STRUCTURE FROM THE FDSM AND ITS ASTROPHYSICAL IMPLICATIONS SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Article; Proceedings Paper CT Conference on Realistic Nuclear Structure, to Honour T T S Kuo at the Occasion of His 60th Birthday CY MAY 28-30, 1992 CL STONY BROOK, NY ID SYMMETRY MODEL; MASSES; NUCLEOSYNTHESIS AB The nuclear structure physics from the Fermion Dynamical Symmetry Model (FDSM) is discussed. Applications of this physics to the astrophysical R-path is given. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP FENG, DH (reprint author), DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1994 VL 242 IS 4-6 BP 333 EP 344 DI 10.1016/0370-1573(94)90167-8 PG 12 WC Physics, Multidisciplinary SC Physics GA NZ939 UT WOS:A1994NZ93900009 ER PT J AU WU, CL CHEN, HT FENG, DH AF WU, CL CHEN, HT FENG, DH TI OPTIMUM PAIRS - A NOVEL WAY TO PORTRAY COLLECTIVE MOTIONS WITHIN THE SHELL-MODEL SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Article; Proceedings Paper CT Conference on Realistic Nuclear Structure, to Honour T T S Kuo at the Occasion of His 60th Birthday CY MAY 28-30, 1992 CL STONY BROOK, NY ID SYMMETRIES AB A remarkable feature was found through a pair-component analysis of shell model wave functions that a many-body wave function can be expressed as a simple direct product of fermion pairs, if the structure and the spins of the pairs (known as optimum pairs) are properly chosen. Accordingly, a generalized pair field method (GPFM) is proposed for solving many-body problems in this basis. It is shown that for both vibrational (pairing interaction) and rotational (pure Q . Q interaction) limits, the GPFM gives either exactly or to an excellent approximation the exact shell model solution, at least for the single-j case. The more general cases remain to be tested. The most attractive feature of this method is that it does not require diagonalization of huge matrices, thus avoids the dimensional difficulty of the traditional shell model approach. C1 OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,DIV PHYS,OAK RIDGE,TN 37831. DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104. RP WU, CL (reprint author), CHUNG YUAN CHRISTIAN UNIV,DEPT PHYS,CHUNGLI,TAIWAN. NR 13 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1994 VL 242 IS 4-6 BP 433 EP 442 DI 10.1016/0370-1573(94)90176-7 PG 10 WC Physics, Multidisciplinary SC Physics GA NZ939 UT WOS:A1994NZ93900018 ER PT J AU WONG, CY GATOFF, G AF WONG, CY GATOFF, G TI THE TRANSVERSE PROFILE OF A COLOR FLUX TUBE SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Article; Proceedings Paper CT Conference on Realistic Nuclear Structure, to Honour T T S Kuo at the Occasion of His 60th Birthday CY MAY 28-30, 1992 CL STONY BROOK, NY ID PARTICLE-PRODUCTION; PAIR CREATION; FRAGMENTATION; STRINGS; MODEL AB The P(T) spectra of soft mesons produced in high-energy collisions contain information on the transverse motion of quarks and antiquarks which form these mesons. Using these data, we study the transverse profile of the color flux tube in the context of the Schwinger's mechanism for particle production by representing the transverse profile in terms of an effective transverse scalar potential. We find that the classical turning point for the potential is of the order of 0.6 fm. However, the potential flattens out considerably beyond that point. Consequently, the wave function decays surprisingly slowly in the transverse direction as r-3/2 and extends much beyond the radius of the flux tube. RP WONG, CY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI Wong, Cheuk-Yin/0000-0001-8223-0659 NR 18 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1994 VL 242 IS 4-6 BP 489 EP 494 DI 10.1016/0370-1573(94)90182-1 PG 6 WC Physics, Multidisciplinary SC Physics GA NZ939 UT WOS:A1994NZ93900024 ER PT J AU SHANK, CV AF SHANK, CV TI RECHARGING THE ENERGY LABORATORIES SO PHYSICS TODAY LA English DT Article RP SHANK, CV (reprint author), LAWRENCE BERKELEY LAB,DEPT ENERGY,BERKELEY,CA 94720, USA. NR 5 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1994 VL 47 IS 7 BP 42 EP 48 DI 10.1063/1.881397 PG 7 WC Physics, Multidisciplinary SC Physics GA NW462 UT WOS:A1994NW46200021 ER PT J AU GREENSPAN, MD SHACKEL, KA MATTHEWS, MA AF GREENSPAN, MD SHACKEL, KA MATTHEWS, MA TI DEVELOPMENTAL-CHANGES IN THE DIURNAL WATER-BUDGET OF THE GRAPE BERRY EXPOSED TO WATER DEFICITS SO PLANT CELL AND ENVIRONMENT LA English DT Article DE VITIS VINIFERA; BERRY; GRAPE; GROWTH; LEAF WATER POTENTIAL; PHLOEM; TRANSPIRATION; VASCULAR WATER FLOW; VITACEAE; XYLEM ID VITIS-VINIFERA L; TOMATO FRUIT; SOLUTE ACCUMULATION; TRANSPIRATION FLOWS; PERICARP CELLS; COWPEA FRUIT; DRY-MATTER; GROWTH; XYLEM; RESPONSES AB The diurnal water budget of developing grape (Vitis vinifera L.) berries was evaluated before and after the onset of fruit ripening (veraison). The diameter of individual berries of potted 'Zinfandel' and 'Cabernet Sauvignon' grapevines was measured continuously with electronic displacement transducers over 24h periods under controlled environmental conditions, and leaf water status was determined by the pressure chamber technique. For well-watered vines, daytime contraction was much less during ripening (after veraison) than before ripening. Daytime contraction was reduced by restricting berry or shoot transpiration, with the larger effect being shoot transpiration pre-veraison and berry transpiration post-veraison. The contributions of the pedicel xylem and phloem as well as berry transpiration to the net diurnal water budget of the fruit were estimated by eliminating phloem or phloem and xylem pathways. Derry transpiration was significant and comprised the bulk of water outflow for the berry both before and after veraison. A nearly exclusive role for the xylem in water transport into the berry was evident during pre-veraison development, but the phloem was clearly dominant in the post-veraison water budget. Daytime contraction was very sensitive to plant water status before veraison but was remarkably insensitive to changes in plant water status after veraison. This transition is attributed to an increased phloem inflow and a partial discontinuity in berry xylem during ripening. C1 LAWRENCE LIVERMORE NATL LAB,DEPT VITICULTURE & ENOL,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,DEPT POMOL,DAVIS,CA 95616. RI Matthews, Mark/A-5714-2010 NR 44 TC 97 Z9 103 U1 4 U2 20 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0140-7791 J9 PLANT CELL ENVIRON JI Plant Cell Environ. PD JUL PY 1994 VL 17 IS 7 BP 811 EP 820 DI 10.1111/j.1365-3040.1994.tb00175.x PG 10 WC Plant Sciences SC Plant Sciences GA NV536 UT WOS:A1994NV53600003 ER PT J AU OSORIO, JM ADASKAVEG, JE OGAWA, JM AF OSORIO, JM ADASKAVEG, JE OGAWA, JM TI INHIBITION OF MYCELIAL GROWTH OF MONILINIA SPECIES AND SUPPRESSION AND CONTROL OF BROWN-ROT BLOSSOM BLIGHT OF ALMOND WITH IPRODIONE AND E-0858 SO PLANT DISEASE LA English DT Article DE BENZIMIDAZOLES; DICARBOXIMIDES; PRUNUS DULCIS; PYRIDINES ID FRUCTICOLA; FUNGICIDES AB The fungicide iprodione and the heterocyclic anilide E-0858 were compared with benomyl for in vitro inhibition of mycelial growth of Monilinia laxa and M. fructicola, for suppression of anther infection of blossoms in the laboratory, and for control of brown rot blossom and twig blight in the field. All 100 isolates of M. laxa obtained from an orchard in Solano County, California, were sensitive to benomyl (no growth at 1.0 mu g a.i./ml), whereas all 100 isolates from an orchard in Fresno County, California, were resistant to benomyl (growth at 1.0 mu g a.i./ml). Effective concentrations (EC(50)) of benomyl in Czapek's medium for inhibition of mycelial growth of M. laxa or M. fructicola averaged 0.09 mu g/ml for sensitive isolates and 0.77 mu g/ mi for resistant isolates. Both iprodione and E-0858 were active against benomyl-sensitive and benomyl-resistant isolates of M. laxa and M. fructicola. Iprodione incorporated into PDA or Czapek's medium was inhibitory to both M. laxa and M. fructicola, with EC(50) values between 0.52 and 0.75 mu g a.i./ml. EC(50) values of E-0858 incorporated in Czapek's medium were 0.30-0.36 mu g a.i./ml for M. laxa and 0.89-0.98 mu g a.i./ml for M. fructicola, whereas EC(50) values of E-0858 in potato-dextrose agar were >450 mu g a.i./ml for inhibition of either M. laxa or M. fructicola mycelia. In laboratory studies, anther infection was suppressed when open blossoms were sprayed with E-0858 or iprodione within 24 hr after inoculation with a benomyl-sensitive isolate of M. laxa. In field studies conducted in almond orchards with benomyl-sensitive or benomyl-resistant populations of M. laxa, applications of E-0858 or iprodione at pink bud (closed blossoms) and full bloom (opened blossoms) effectively reduced brown rot twig blight. Mycelial inhibition and suppression of disease development contribute to the high efficacy of iprodione and E-0858 in control of brown rot blossom and twig blight of almond. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PLANT PATHOL,DAVIS,CA 95616. NR 22 TC 11 Z9 11 U1 0 U2 2 PU AMER PHYTOPATHOLOGICAL SOC PI ST PAUL PA 3340 PILOT KNOB ROAD, ST PAUL, MN 55121 SN 0191-2917 J9 PLANT DIS JI PLANT DIS. PD JUL PY 1994 VL 78 IS 7 BP 712 EP 716 PG 5 WC Plant Sciences SC Plant Sciences GA NU559 UT WOS:A1994NU55900015 ER PT J AU LI, HM KANEKO, Y KEEGSTRA, K AF LI, HM KANEKO, Y KEEGSTRA, K TI MOLECULAR-CLONING OF A CHLOROPLASTIC PROTEIN ASSOCIATED WITH BOTH THE ENVELOPE AND THYLAKOID MEMBRANES SO PLANT MOLECULAR BIOLOGY LA English DT Article DE CHLOROPLASTS; ENVELOPE; LOCALIZATION; PRECURSOR PROTEIN; THYLAKOID ID PRECURSOR PROTEINS; ESCHERICHIA-COLI; IMPORT RECEPTOR; OUTER-MEMBRANE; TRANSPORT; SEQUENCE; INNER; TRANSLOCATION; POLYPEPTIDE; PEPTIDES AB Chloroplasts consist of six morphologically distinct compartments. Each compartment has a specific set of polypeptides that perform distinct biochemical functions. We report here the identification of a membrane-associated protein with a novel localization. This protein was synthesized as a 37 kDa precursor and was processed to a mature protein of 30 kDa after being imported into isolated pea chloroplasts. Fractionation of chloroplasts showed that the 30 kDa mature protein was associated with both of the envelope membranes as well as with thylakoid membranes. Immunocyto-chemical localization of the 30 kDa protein revealed that the protein occurred in clusters in the vicinity of both the envelope and the thylalkoid. Possible functions of this 30 kDa protein, inferred from its novel localization pattern, are discussed. C1 MICHIGAN STATE UNIV, MSU DOE PLANT RES LAB, E LANSING, MI 48824 USA. UNIV WISCONSIN, DEPT BOT, MADISON, WI 53706 USA. SAITAMA UNIV, FAC SCI, DEPT REGULAT BIOL, URAWA, SAITAMA 338, JAPAN. RI Kaneko, Yasuko/F-9376-2015 NR 34 TC 58 Z9 60 U1 0 U2 4 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0167-4412 EI 1573-5028 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD JUL PY 1994 VL 25 IS 4 BP 619 EP 632 DI 10.1007/BF00029601 PG 14 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA PD025 UT WOS:A1994PD02500004 PM 8061316 ER PT J AU MATTOR, N COHEN, RH AF MATTOR, N COHEN, RH TI MINIMUM ENSTROPHY STATE IN THE TOKAMAK SCRAPE-OFF LAYER SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID PLASMA EDGE TURBULENCE; DRIFT WAVE TURBULENCE; 2-DIMENSIONAL TURBULENCE; CONVECTION CELLS; SHEARED FLOW; FLUCTUATIONS; INSTABILITY; GENERATION; TRANSPORT; MODEL AB A theory is presented on turbulence and transport in the scrape-off layer of a tokamak. It is argued that there is a dual cascade of energy (to long wavelengths) and enstrophy (to short wavelengths), driving an equilibrium in which enstrophy is minimized for a fixed energy. For a toroidally-limited tokamak scrape-off layer, this flow takes the form V(r) = V(a)e(-lambda(r-a)theta). The electrostatic-potential profile and the electron-temperature profile follow directly from V(r). Thus, the thermal transport problem is solved without the need for intermediate transport coefficients. The two parameters lambda and V(a) are determined from a combination of energy balance and dimensional analysis. RP MATTOR, N (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 47 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 BP 1115 EP 1140 DI 10.1088/0741-3335/36/7/003 PG 26 WC Physics, Fluids & Plasmas SC Physics GA NY139 UT WOS:A1994NY13900003 ER PT J AU BRETZ, N NAZIKIAN, R BUSH, C RIEDEL, K SIDORENKO, A AF BRETZ, N NAZIKIAN, R BUSH, C RIEDEL, K SIDORENKO, A TI DENSITY-FLUCTUATIONS ASSOCIATED WITH LIMITER H-MODES ON TFTR SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID TOKAMAK; TRANSITION AB Edge density fluctuations have been observed with microwave scattering in limiter H-mode plasmas on TFTR. The primary feature of these fluctuations is a strong average frequency shift in the electron diamagnetic drift direction corresponding to poloidal velocities of 1-3x10(6) cm/s and an inward radial electric field of 60 kV/m. The rotation begins to increase at the Halpha drop and rises to a steady state in 5 to 50 ms. well before ELMs begin. ELMS modulate the rotation feature, eliminating it for the duration of the ELM. After the ELM, the rotation feature resumes its pre-ELM value in about 0.1 ms. Short duration (0.01 ms) precursor bursts propagating in the ion diamagnetic direction are observed to precede the ELM event by approximately 0.5 ms. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. NYU,COURANT INST MATH SCI,NEW YORK,NY 10012. RP BRETZ, N (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 12 TC 4 Z9 4 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A141 EP A146 DI 10.1088/0741-3335/36/7A/018 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300019 ER PT J AU BUSH, CE BRETZ, N BUDNY, R SYNAKOWSKI, EJ BATHA, SH DURST, R EFTHIMION, PC FONCK, RJ FREDRICKSON, ED LEVINTON, FM PAUL, S TAYLOR, G AF BUSH, CE BRETZ, N BUDNY, R SYNAKOWSKI, EJ BATHA, SH DURST, R EFTHIMION, PC FONCK, RJ FREDRICKSON, ED LEVINTON, FM PAUL, S TAYLOR, G TI SUPERSHOT TO LIMITER H-MODE TRANSITIONS IN DEUTERIUM PLASMAS IN TFTR SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID TOKAMAK AB Supershot to limiter H-mode transitions have been studied on TFTR. In several cases an edge poloidal rotation was observed prior to the initial D(alpha) drop at the transition. This spin-up is consistent with formation of a radial electric field, -E(r). The delp(I) contribution to E(r) is approximately 30 kV/m and the density fluctuation level is reduced by a factor of 1 to 1.5 over a 5 cm region at the plasma edge across the transition. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. FUS PHYS & TECHNOL INC, TORRANCE, CA USA. UNIV WISCONSIN, MADISON, WI 53706 USA. RP PRINCETON PLASMA PHYS LAB, POB 451, PRINCETON, NJ 08543 USA. NR 9 TC 6 Z9 6 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 EI 1361-6587 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A153 EP A158 DI 10.1088/0741-3335/36/7A/020 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300021 ER PT J AU CARLSTROM, TN GOHIL, P WATKINS, JG BURRELL, KH CODA, S DOYLE, EJ GROEBNER, RJ KIM, J MOYER, RA RETTIG, CL AF CARLSTROM, TN GOHIL, P WATKINS, JG BURRELL, KH CODA, S DOYLE, EJ GROEBNER, RJ KIM, J MOYER, RA RETTIG, CL TI EXPERIMENTAL SURVEY OF THE L-H TRANSITION CONDITIONS IN THE DIII-D TOKAMAK SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY AB We present the global analysis of a recent survey of the H-mode power threshold in DIII-D using D-degrees --> D+ NBI after boronization of the vacuum vessel. Single parameter scans of B(T), I(P), density, and plasma shape have been carried out on the DIII-D tokamak for neutral beam heated single-null and double-null diverted plasmas. In single-null discharges, the power threshold is found to increase approximately linearly with B(T) and n. but remains independent of I(P). In double-null discharges, the power threshold is found to be approximately independent of both B(T) and n(e). Various shape parameters such as plasma-wall gaps had only a weak effect on the power threshold. Imbalancing the double null configuration resulted in a large increase in the threshold power. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. MIT,CAMBRIDGE,MA 02139. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RP CARLSTROM, TN (reprint author), GEN ATOM,POB 85608,SAN DIEGO,CA 92186, USA. NR 5 TC 17 Z9 17 U1 1 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A147 EP A152 DI 10.1088/0741-3335/36/7A/019 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300020 ER PT J AU CARRERAS, BA DIAMOND, PH LIANG, YM LEBEDEV, V NEWMAN, D AF CARRERAS, BA DIAMOND, PH LIANG, YM LEBEDEV, V NEWMAN, D TI DYNAMICS OF L-BIFURCATION TO H-BIFURCATION SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID CONFINEMENT; GENERATION; TURBULENCE; TOKAMAK; REGIME; FLOW AB A self-consistent model of the L to H transition is derived from coupled nonlinear envelope equations for the fluctuation level, radial electric field shear E(r)', and pressure gradient delP(i). These equations exhibit a bifurcation between dual L-mode and H-mode fixed points. They show that the L to H transition has similar characteristics to a phase transition of the second kind for which the order parameter is E(r)'. The transition occurs when the turbulence drive is large enough to overcome the damping of the EXB flow. This leads to a power threshold condition for the transition P(crit) almost-equal-to (munT)edge aRL(s). C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP CARRERAS, BA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 TC 20 Z9 20 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A93 EP A98 DI 10.1088/0741-3335/36/7A/010 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300011 ER PT J AU GROEBNER, RJ ALLEN, SL BAKER, DR BROOKS, NH BUCHENAUER, DA BURRELL, KH CARLSTROM, TN CHU, MS CODA, S CUTHBERTSON, J DOYLE, EJ EVANS, TE FERRON, JR FINKENTHAL, D FUTCH, AH GOHIL, P GREENFIELD, CM HILL, DN HILLIS, DL HINTON, FL HOGAN, J HSIEH, CL HYATT, AW JACKSON, GL JONG, R KIM, J KIM, YB KLEPPER, CC KONOSHIMA, S LAHAYE, RJ LAO, LL LASNIER, CJ LAZARUS, EA LEONARD, AW LIPPMANN, SI MAHDAVI, MA MAINGI, R MANDL, W MARTIN, Y MOYER, RA OSBORNE, TH PEEBLES, WA PETRIE, TW PORTER, GD RENSINK, ME RETTIG, CL RHODES, TH SCHAFFER, MJ SCHISSEL, DP SERAYDARIAN, RP SNIDER, RT STAEBLER, GM STAMBAUGH, RD STJOHN, H STRAIT, EJ TAYLOR, TS THOMAS, DM THOMPSON, SJ TURNBULL, AD WADE, MR WATKINS, JG WEST, WP WOOD, RD WROBLEWSKI, D AF GROEBNER, RJ ALLEN, SL BAKER, DR BROOKS, NH BUCHENAUER, DA BURRELL, KH CARLSTROM, TN CHU, MS CODA, S CUTHBERTSON, J DOYLE, EJ EVANS, TE FERRON, JR FINKENTHAL, D FUTCH, AH GOHIL, P GREENFIELD, CM HILL, DN HILLIS, DL HINTON, FL HOGAN, J HSIEH, CL HYATT, AW JACKSON, GL JONG, R KIM, J KIM, YB KLEPPER, CC KONOSHIMA, S LAHAYE, RJ LAO, LL LASNIER, CJ LAZARUS, EA LEONARD, AW LIPPMANN, SI MAHDAVI, MA MAINGI, R MANDL, W MARTIN, Y MOYER, RA OSBORNE, TH PEEBLES, WA PETRIE, TW PORTER, GD RENSINK, ME RETTIG, CL RHODES, TH SCHAFFER, MJ SCHISSEL, DP SERAYDARIAN, RP SNIDER, RT STAEBLER, GM STAMBAUGH, RD STJOHN, H STRAIT, EJ TAYLOR, TS THOMAS, DM THOMPSON, SJ TURNBULL, AD WADE, MR WATKINS, JG WEST, WP WOOD, RD WROBLEWSKI, D TI OVERVIEW OF H-MODE STUDIES IN DIII-D SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID ENERGY CONFINEMENT; POLOIDAL ROTATION; EDGE TURBULENCE; D TOKAMAK; TRANSITION; DISCHARGES; TRANSPORT; REDUCTION AB A major portion of the DIII-D program includes studies of the L-H transition, of the VH-mode, of particle transport and control and of the power-handling capability of a divertor. Significant progress has been made in all of these areas and the purpose of this paper is to summarize the major results obtained during the last two years. An increased understanding of the origin of improved confinement in H-mode and in VH-mode discharges has been obtained, good impurity control has been achieved in several operating scenarios, studies of helium transport provide encouraging results from the point of view of reactor design, an actively pumped divertor chamber has controlled the density in H-mode discharges and a radiative divertor is a promising technique for controlling the heat flux from the main plasma. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CALIF BERKELEY, BERKELEY, CA 94720 USA. MAX PLANCK INST PLASMA PHYS, W-8046 GARCHING, GERMANY. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. JAPAN ATOM ENERGY RES INST, IBARAKI, JAPAN. ECOLE POLYTECH FED LAUSANNE, CH-1007 LAUSANNE, SWITZERLAND. RP GEN ATOM, POB 85608, SAN DIEGO, CA 92186 USA. NR 52 TC 10 Z9 10 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 EI 1361-6587 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A13 EP A22 DI 10.1088/0741-3335/36/7A/002 PG 10 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300003 ER PT J AU HILLIS, DL WADE, MR HOGAN, JT WEST, WP BURRELL, KH MAINGI, R KLEPPER, CC MENON, MM MIODUSZEWSKI, PK MAHDAVI, MA JACKSON, GL BROOKS, NH FINKENTHAL, DF AF HILLIS, DL WADE, MR HOGAN, JT WEST, WP BURRELL, KH MAINGI, R KLEPPER, CC MENON, MM MIODUSZEWSKI, PK MAHDAVI, MA JACKSON, GL BROOKS, NH FINKENTHAL, DF TI HELIUM TRANSPORT AND EXHAUST STUDIES OF H-MODE DISCHARGES IN THE DIII-D TOKAMAK SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID CONFINEMENT; TEXTOR; PUMP AB A collaborative program has been initiated on DIII-D to study helium (He) transport and exhaust in H-mode plasmas. To simulate the presence of He ash in DIII-D, a 50 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of approximately 15%. The time dependence of the He density profiles in the plasma core is measured with charge-exchange recombination spectroscopy and the He spatial distribution on the divertor floor is studied with an impurity monitor array. The dependence of core transport diffusivities as a function of edge-localized modes(ELM) frequency has been studied and the first demonstration made of He exhaust from an ELMing H-mode plasma in a diverted tokamak. A measured value of tau(He)*/tau(E) Of 14 was obtained, which is within the acceptable range for a fusion reactor. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. GEN ATOM CO,SAN DIEGO,CA 92138. RP HILLIS, DL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 18 TC 4 Z9 4 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A171 EP A176 DI 10.1088/0741-3335/36/7A/023 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300024 ER PT J AU KAYE, SM DUNLAP, JL KUGEL, H LEBLANC, B SCHMITZ, L SESNIC, S TYNAN, G AF KAYE, SM DUNLAP, JL KUGEL, H LEBLANC, B SCHMITZ, L SESNIC, S TYNAN, G TI AN OVERVIEW OF PBX-M H-MODE RESULTS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID KINETIC BALLOONING MODES; TOKAMAKS; PARTICLES AB The PBX-M tokamak has an array of unique features that allow it to study regimes of enhanced confinement and stability. In particular, because of its divertor operation, PBX-M has proved to be a valuable contributor to identifying and understanding various features of H-mode physics. To be reported here are recent results of H-mode studies of m=1 bias induced H-modes, L- to H-transitions, including suppression of turbulent transport, ELMs and other related energy loss mechanisms, and Ion Bernstein Wave modification of H-mode discharges. C1 ORNL, OAK RIDGE, TN 37831 USA. UNIV CALIF LOS ANGELES, IPFR, LOS ANGELES, CA 90024 USA. RP KAYE, SM (reprint author), PRINCETON UNIV, PPPL, PRINCETON, NJ 08544 USA. NR 21 TC 4 Z9 4 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A51 EP A60 DI 10.1088/0741-3335/36/7A/005 PG 10 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300006 ER PT J AU KAYE, SM DUNLAP, JL HAHM, TS SESNIC, S TANG, W HARRIS, JH RONEY, P DAVIS, W AF KAYE, SM DUNLAP, JL HAHM, TS SESNIC, S TANG, W HARRIS, JH RONEY, P DAVIS, W TI ELM-RELATED FLUCTUATIONS IN PBX-M H-MODES SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID KINETIC BALLOONING MODES; EDGE-LOCALIZED MODES; DIII-D; PARTICLES; TOKAMAKS AB Edge Localized Modes have been studied in PBX-M discharges with high data sampling rate magnetic diagnostics with good spatial coverage. High frequency (greater-than-or-equal-to 250 kHz) activity appears prior to the increase in the D(alpha) emission. While this high frequency activity is global, with high coherence for all coils both on the inside and outside midplane, there is no identifiable mode structure. A very intense outward ballooning feature appears simultaneously with the increase in the D(alpha) emission, and lasts for about 5 msec. The toroidal mode structure of this feature is clearly identifiable, consisting of a series of toroidal harmonics from n=3 to 8, at frequencies given by f(n)=f0+nDELTAf, where DELTAf=20-30 kHz and f0=30-50 kHz. This feature may be caused by the kinetic ballooning mode. C1 ORNL,OAK RIDGE,TN 37831. RP KAYE, SM (reprint author), PRINCETON UNIV,PPPL,PRINCETON,NJ 08544, USA. NR 13 TC 7 Z9 7 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A135 EP A140 DI 10.1088/0741-3335/36/7A/017 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300018 ER PT J AU KIM, J BURRELL, KH GOHIL, P GROEBNER, RJ HINTON, FL KIM, YB MANDL, W SERAYDARIAN, R WADE, MR AF KIM, J BURRELL, KH GOHIL, P GROEBNER, RJ HINTON, FL KIM, YB MANDL, W SERAYDARIAN, R WADE, MR TI FUEL ION ROTATION MEASUREMENT AND ITS IMPLICATIONS ON H-MODE THEORIES SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID EDGE ELECTRIC-FIELD; DIII-D TOKAMAK; POLOIDAL ROTATION; CONFINEMENT BIFURCATION; TRANSITION; TURBULENCE; TRANSPORT; PLASMA; DISCHARGES; ASDEX AB Poloidal and toroidal rotation of the fuel ions (He-2+) and the impurity ions (C6+ and B5+) in H-mode helium plasmas have been investigated in the DIII-D tokamak by means of charge exchange recombination spectroscopy, resulting in the discovery that the fuel ion poloidal rotation is in the ion diamagnetic drift direction while the impurity ion rotation is in the electron diamagnetic drift direction. The radial electric field obtained from radial force balance analysis of the measured pressure gradients and rotation velocities is shown to be the same regardless of which ion species is used and therefore is a more fundamental parameter than the rotation flows in studying H-mode phenomena. It is shown that the three contributions to the radial electric field (diamagnetic, poloidal rotation, and toroidal rotation terms) are comparable and consequently the poloidal flow does not solely represent the E x B flow. In the high-shear edge region, the density scale length is comparable to the ion poloidal gyroradius, and thus neoclassical theory is not valid there. In view of this new discovery that the fuel and impurity ions rotate in opposite sense, L-H transition theories based on the poloidal rotation may require improvement. C1 IPP, GARCHING, GERMANY. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. RP GEN ATOM, POB 85608, SAN DIEGO, CA 92186 USA. NR 27 TC 20 Z9 20 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 EI 1361-6587 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A183 EP A188 DI 10.1088/0741-3335/36/7A/025 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300026 ER PT J AU KIM, YB HINTON, FL STJOHN, H TAYLOR, TS WROBLEWSKI, D AF KIM, YB HINTON, FL STJOHN, H TAYLOR, TS WROBLEWSKI, D TI EXTENDED THEORY OF MAIN ION AND IMPURITY ROTATION AND BOOTSTRAP CURRENT IN A SHEAR-LAYER SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY AB In this paper, standard neoclassical theory has been extended into the shear layer. Main ion and impurity ion rotation velocity and bootstrap current within shear layer in H-mode are discussed. Inside the H-mode shear layer, standard neoclassical theory is not valid since the ion poloidal gyroradius becomes comparable to pressure gradient and electric field gradient scale length. We present modified expressions of impurity flows and bootstrap current in a shear layer neglecting ion temperature gradient. Comparisons with DIII-D measurements are also discussed. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KIM, YB (reprint author), GEN ATOM,POB 85608,SAN DIEGO,CA 92186, USA. NR 4 TC 6 Z9 6 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A189 EP A193 DI 10.1088/0741-3335/36/7A/026 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300027 ER PT J AU OSBORNE, TH BURRELL, KH CARLSTROM, TN CHU, MS DEBOO, JC DOYLE, EJ FERRON, JR GOHIL, P GREENFIELD, CM GROEBNER, RJ HYATT, AW JACKSON, GL KIM, YB KONOSHIMA, S KURKISUONIO, TK LAHAYE, RJ LAZARUS, EA LAO, LL LIPPMANN, SI PETRIE, TW RETTIG, CL STAMBAUGH, RD STAEBLER, GM STJOHN, H STRAIT, EJ TAYLOR, TS THOMPSON, SJ TURNBULL, AD WROBLEWSKI, D AF OSBORNE, TH BURRELL, KH CARLSTROM, TN CHU, MS DEBOO, JC DOYLE, EJ FERRON, JR GOHIL, P GREENFIELD, CM GROEBNER, RJ HYATT, AW JACKSON, GL KIM, YB KONOSHIMA, S KURKISUONIO, TK LAHAYE, RJ LAZARUS, EA LAO, LL LIPPMANN, SI PETRIE, TW RETTIG, CL STAMBAUGH, RD STAEBLER, GM STJOHN, H STRAIT, EJ TAYLOR, TS THOMPSON, SJ TURNBULL, AD WROBLEWSKI, D TI RECENT VH-MODE RESULTS ON DIII-D SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID D TOKAMAK; CONFINEMENT; DISCHARGES; EDGE AB A regime of improved H-mode energy confinement, VH-mode, is obtained in the DIII-D tokamak with adequate vessel conditioning. The improved confinement in VH-mode is consistent with the extension of the region of high E X B velocity shear turbulence suppression sone further in from the plasma boundary. The energy confinement enhancement in VH-mode can be limited by ELMs, localized momentum transfer events, or operation at high heating power or low q. Energy confinement enhancement improves with increasing triangularity of the plasma cross section and is independent of elongation. The termination of VH-mode is associated with an edge localized kink mode which is destabilized by both the large edge pressure gradient and edge current density. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. HELSINKI UNIV TECHNOL,SF-02150 ESPOO 15,FINLAND. JAPAN ATOM ENERGY RES INST,IBARAKI,JAPAN. RP OSBORNE, TH (reprint author), GEN ATOM,POB 85608,SAN DIEGO,CA 92186, USA. NR 16 TC 23 Z9 23 U1 0 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A237 EP A242 DI 10.1088/0741-3335/36/7A/034 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300035 ER PT J AU SESNIC, S DUNLAP, J KAITA, R KAYE, SM OKABAYASHI, M AF SESNIC, S DUNLAP, J KAITA, R KAYE, SM OKABAYASHI, M TI PERIODS OF ENHANCED TRANSPORT DURING H-MODE IN PBX-M SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID HEATED DIVERTOR DISCHARGES; M TOKAMAK; CONFINEMENT AB In PBX-M, periods of enhanced transport are often observed in high beta(pol) H-mode discharges. They can reduce the energy confinement time by a factor of two. Their duration is typically between 2 to 20 ms. They are followed by periods of normal transport of a similar duration. These periods of enhanced transport consist of a series of turbulent m=even MHD events, starting several cm inside the plasma edge. They propagate into the confinement region in 600 mus, causing a progressive erosion of the profile. Each m=even event can also cause an energy loss of 1% or less, mainly from the confinement region. These m=even events are reminiscent of grassy ELMs. RP SESNIC, S (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A225 EP A230 DI 10.1088/0741-3335/36/7A/032 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300033 ER PT J AU SHAING, KC HSU, CT CHRISTENSON, PJ AF SHAING, KC HSU, CT CHRISTENSON, PJ TI L-H TRANSITION IN TOKAMAKS AND STELLARATORS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; MODE TRANSITION; SHOCK FORMATION; JFT-2M TOKAMAK; PLASMAS AB It is shown that the bifurcation dynamics in the H-mode theory based on the ion orbit loss and nonlinear viscosity is not sensitive to the radial pressure and temperature gradients after bifurcation. This allows the poloidal flow velocity to be opposite to that of the poloidal E x B velocity in the H-mode phase if the pressure gradient is steep. Here, E(B) is the electric (magnetic) field. The theory is also extended to stellarator configurations to demonstrate that the tokamak H-mode theory can be tested in a controlled manner in those devices. A set of poloidal and toroidal momentum evolution equations is derived in which the radial current density outside the last dosed flux surface is expressed in terms of the radial integral of the poloidal current density into the divertor plates. This facilitates the calculation of the radial electric field profile across the separatrix. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 17 TC 8 Z9 10 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A75 EP A80 DI 10.1088/0741-3335/36/7A/007 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300008 ER PT J AU STAMBAUGH, RD ALLEN, SL BROOKS, NH HILL, DN HILLIS, DL HYATT, AW JACKSON, GL KONOSHIMA, S LAZARUS, EA LEONARD, AW LIPPMANN, SI MAHDAVI, MA MAINGI, R MENON, MM OSBORNE, TH PETRIE, TW PORTER, GD RENSINK, ME SCHAFFER, MJ SCHISSEL, DP STAEBLER, GM WADE, MR WOOD, RD AF STAMBAUGH, RD ALLEN, SL BROOKS, NH HILL, DN HILLIS, DL HYATT, AW JACKSON, GL KONOSHIMA, S LAZARUS, EA LEONARD, AW LIPPMANN, SI MAHDAVI, MA MAINGI, R MENON, MM OSBORNE, TH PETRIE, TW PORTER, GD RENSINK, ME SCHAFFER, MJ SCHISSEL, DP STAEBLER, GM WADE, MR WOOD, RD TI DIVERTOR PUMPING AND OTHER REACTOR APPLICATION ISSUES FOR H-MODE SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY AB We summarize results from DIII-D in regard to issues for reactor application of H-mode. Recently, DIII-D has begun to operate a cryopump (D2 pumping speed = 31,000 l/s at a pressure of 2 mTorr). Initial results are very favorable for density control in H-mode. The plasma density could be reduced by 50%. Energy confinement is unchanged so the temperature rises in proportion to the density drop. Ability to access these less collisional plasmas in H-mode is favorable to current drive application. With the all-graphite wall, impurity accumulation has been eliminated. The exceedingly good confinement of VH-mode offers the possibility of retaining good confinement while radiating copious power from the plasma edge using injected noble gas impurities. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. JAPAN ATOM ENERGY RES INST,IBARAKI,JAPAN. RP STAMBAUGH, RD (reprint author), GEN ATOM,POB 85608,SAN DIEGO,CA 92186, USA. NR 14 TC 4 Z9 4 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A249 EP A254 DI 10.1088/0741-3335/36/7A/036 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300037 ER PT J AU TYNAN, GR SCHMITZ, L BLUSH, L BOEDO, JA CONN, RW DOERNER, R LEHMER, R MOYER, R KUGEL, H BELL, R KAYE, S OKABAYASHI, M SESNIC, S SUN, Y AF TYNAN, GR SCHMITZ, L BLUSH, L BOEDO, JA CONN, RW DOERNER, R LEHMER, R MOYER, R KUGEL, H BELL, R KAYE, S OKABAYASHI, M SESNIC, S SUN, Y TI THE PHYSICS OF TRANSPORT BARRIER FORMATION IN THE PBX-M H-MODE SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID ELECTRIC-FIELDS; EDGE-PLASMA; TOKAMAK; TURBULENCE; CONFINEMENT; DISCHARGES; TRANSITION AB Measurements of edge profiles, turbulence, and turbulent-driven transport were made inside the last-closed flux surface (LCFS) and in the scrape-off layer (SOL) of PBX-M L-mode and H-mode plasmas using a fast reciprocating Langmuir probe diagnostic. Direct measurements of the potential profile confirm the generation of a strong inward radial electric field (E(r) approximately -100 V/cm) just inside the LCFS in H-mode. Density and potential fluctuation levels are reduced at the L-H transition, resulting in significantly lower turbulent transport. The edge density gradient then steepens in response to the reduced cross-field transport. After a stable H-mode edge equilibrium is formed, the fluctuation amplitudes recover back to nearly L-mode values. The poloidal wavenumber spectrum is narrowed in the transport barrier, and the density and potential fluctuations are decorrelated. The reduction in turbulent transport occurs across the LCFS and SOL regions and is not localized to the region of strong radial electric field. C1 MIT,CAMBRIDGE,MA 02139. PPPL,PRINCETON,NJ. ORNL,OAK RIDGE,TN. RP TYNAN, GR (reprint author), UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024, USA. NR 15 TC 10 Z9 10 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A285 EP A290 DI 10.1088/0741-3335/36/7A/042 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300043 ER PT J AU ZUSHI, H NAGASAKI, K MIZUUCHI, T KONDO, K TAKADA, H NAKAYAMA, T SUZUKI, Y ISAYAMA, A OBIKI, T BIGELOW, T MURAKAMI, M LYON, J AF ZUSHI, H NAGASAKI, K MIZUUCHI, T KONDO, K TAKADA, H NAKAYAMA, T SUZUKI, Y ISAYAMA, A OBIKI, T BIGELOW, T MURAKAMI, M LYON, J TI A STUDY OF TRANSITION PHENOMENA ASSOCIATED WITH PARTICLE-TRANSPORT IMPROVEMENT IN ECRH PLASMAS ON HELIOTRON-E SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 4th H-Mode Workshop (IAEA Technical Committee Meeting on H-Mode Physics) CY NOV 15-17, 1993 CL NAKA, JAPAN SP INT ATOM ENERGY AGCY ID CONFINEMENT AB Particle transport in ECRH plasmas has been investigated for both cases of edge or central heating at the second harmonic cyclotron frequency. Global particle confinement is improved for both cases, and a transition phenomenon occurs for the case of edge heating. The effects of the trapped electron loss on the particle confinement improvement are discussed. C1 KYOTO UNIV,DEPT ELECT ENGN,KYOTO 606,JAPAN. KYOTO UNIV,DEPT NUCL ENGN,KYOTO 606,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP ZUSHI, H (reprint author), KYOTO UNIV,PLASMA PHYS LAB,UJI,KYOTO 611,JAPAN. NR 12 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUL PY 1994 VL 36 IS 7 SU A BP A231 EP A236 DI 10.1088/0741-3335/36/7A/033 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NY793 UT WOS:A1994NY79300034 ER PT J AU CARTER, CS ROBERTSON, LC CHADERJIAN, MR OSHORACELAYA, L NORDAHL, TE AF CARTER, CS ROBERTSON, LC CHADERJIAN, MR OSHORACELAYA, L NORDAHL, TE TI ATTENTIONAL ASYMMETRY IN SCHIZOPHRENIA - THE ROLE OF ILLNESS SUBTYPE AND SYMPTOMATOLOGY SO PROGRESS IN NEURO-PSYCHOPHARMACOLOGY & BIOLOGICAL PSYCHIATRY LA English DT Review DE ATTENTION; COVERT ORIENTING; REACTION TIME; SCHIZOPHRENIA; SYMPTOMATOLOGY ID NEGATIVE SYMPTOMS; VISUAL-ATTENTION; DISENGAGEMENT AB 1. Patients with undifferentiated and paranoid schizophrenia, and normal controls were compared using 2 versions Of the covert orienting of attention procedure which evaluate exogenous (automatic) and endogenous (controlled) cuing mechanisms. 2. For both tasks, attentional performance varied with illness subtype, but in different ways. 3. On measures of automatic orienting undifferentiated patients showed evidence consistent with a mild right visual field deficit, while paranoid showed a reduction of inhibition-of-return, a mechanism which biases against returning to previously attended locations. 4. On measures of controlled orienting only the undifferentiated group showed the asymmetry of costs which has been the emphasis of most previous studies. The pattern of cost asymmetry was similar to that previously associated with prominent negative symptoms. Additionally, the magnitude of cost asymmetry correlated positively with negative symptoms in the overall patient group. 5. These findings show that systematically considering cue type and symptomatology are critical in interpreting varying patterns of performance by different groups of patients with schizophrenia on the covert orienting procedure. The implications of these findings for understanding the psychopathology of attention in schizophrenia and its neurobiological substrates are discussed. C1 UNIV CALIF DAVIS,SACRAMENTO MED CTR,SCH MED,DEPT NEUROL,SACRAMENTO,CA 95817. VET ADM MED CTR,MARTINEZ,CA 94553. LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. RP CARTER, CS (reprint author), UNIV CALIF DAVIS,SACRAMENTO MED CTR,MED CTR,DEPT PSYCHIAT,4430 V ST,SACRAMENTO,CA 95817, USA. RI Nordahl, Thomas/J-7643-2013 OI Nordahl, Thomas/0000-0002-8627-0356 FU NIMH NIH HHS [NIMHMH 46990] NR 31 TC 32 Z9 32 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-5846 J9 PROG NEURO-PSYCHOPH JI Prog. Neuro-Psychopharmacol. Biol. Psychiatry PD JUL PY 1994 VL 18 IS 4 BP 661 EP 683 DI 10.1016/0278-5846(94)90075-2 PG 23 WC Clinical Neurology; Neurosciences; Pharmacology & Pharmacy; Psychiatry SC Neurosciences & Neurology; Pharmacology & Pharmacy; Psychiatry GA NX419 UT WOS:A1994NX41900003 PM 7938558 ER PT J AU RUDMAN, SD SAUNDERS, RW KILSBY, CG MINNETT, PJ AF RUDMAN, SD SAUNDERS, RW KILSBY, CG MINNETT, PJ TI WATER-VAPOR CONTINUUM ABSORPTION IN MIDLATITUDES - AIRCRAFT MEASUREMENTS AND MODEL COMPARISONS SO QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY LA English DT Article ID COEFFICIENTS AB Recently reported measurements by the Meteorological Research Flight C-130 aircraft over the tropical Atlantic have shown that existing models of infrared water vapour continuum absorption underestimate its magnitude by up to 30%. This paper presents additional results from more recent measurements made close to the south-west approaches of the British Isles and over the eastern Mediterranean Sea. These measurements are compared with two models: GENLN2, a line-by-line model, and the widely used band model LOWTRAN7. The measured radiances suggest a consistent underestimate in both models of the water vapour continuum absorption. The modified parametrization for the water vapour continuum absorption, inferred from the tropical results, was also used here to check its validity for lower water vapour amounts and lower temperatures. As with the tropical results, increasing the self-broadening coefficient by a constant factor, or increasing the temperature dependence, improves the agreement between the measurements and the model predictions. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP RUDMAN, SD (reprint author), METEOROL OFF,TELECOMMUN BRANCH,LONDON RD,BRACKNELL RB12 2SZ,BERKS,ENGLAND. NR 18 TC 6 Z9 6 U1 0 U2 0 PU ROYAL METEOROLOGICAL SOC PI READING PA 104 OXFORD ROAD, READING, BERKS, ENGLAND RG1 7LJ SN 0035-9009 J9 Q J ROY METEOR SOC JI Q. J. R. Meteorol. Soc. PD JUL PY 1994 VL 120 IS 518 BP 795 EP 807 DI 10.1002/qj.49712051803 PN A PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NX229 UT WOS:A1994NX22900002 ER PT J AU GLASSNER, BJ MORTIMER, RK AF GLASSNER, BJ MORTIMER, RK TI SYNERGISTIC INTERACTIONS BETWEEN RAD5, RAD16 AND RAD54, 3 PARTIALLY HOMOLOGOUS YEAST DNA-REPAIR GENES EACH IN A DIFFERENT REPAIR PATHWAY SO RADIATION RESEARCH LA English DT Article ID RADIATION-SENSITIVE MUTANT; COMPLEMENTATION GROUP-C; DOUBLE-STRAND BREAKS; SACCHAROMYCES-CEREVISIAE; PUTATIVE HELICASES; PYRIMIDINE DIMERS; ACTIVE GENES; CELL-FUSION; EXCISION; SEQUENCE AB Considerable homology has recently been noted between the proteins encoded by the RADS, RAD16 and RAD54 genes of Saccharomyces cerevisiae. These genes are members of the RAD6, RAD3 and RAD50 epistasis groups, respectively, which correspond to the three major DNA repair pathways in yeast. These proteins also share homology with other eucaryotic proteins, including those encoded by SNF2 and MOT1 of yeast, brahma and lodestar of Drosophila and the human ERCC6 gene. The homology shares features with known helicases, suggesting a newly identified helicase subfamily. We have constructed a series of congenic single-, double- and triple-deletion mutants involving RADS, RAD16 and RAD54 to examine the interactions between these genes. Each deletion mutation alone has only a moderate effect on survival after exposure to UV radiation. Each pairwise-double mutant exhibits marked synergism. The triple-deletion mutant displays further synergism. These results confirm the assignment of the RAD54 gene to the RAD50 epistasis group and suggest that the RAD16 gene plays a larger role in DNA repair after exposure to UV radiation than has been suggested previously. Additionally, the proteins encoded by RAD5, RAD16 and RAD54 may compete for the same substrate after damage induced by UV radiation, possibly at an early step in their respective pathways. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELLULAR BIOL,DIV GENET,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP GLASSNER, BJ (reprint author), HARVARD UNIV,SCH PUBL HLTH,DEPT MOLEC & CELLULAR TOXICOL,GRAD GRP BIOPHYS,665 HUNTINGTON AVE,BOSTON,MA 02115, USA. FU NIGMS NIH HHS [GM30990] NR 49 TC 13 Z9 13 U1 0 U2 2 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUL PY 1994 VL 139 IS 1 BP 24 EP 33 DI 10.2307/3578728 PG 10 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA NU848 UT WOS:A1994NU84800004 PM 8016304 ER PT J AU KLEINERMAN, RA LITTLEFIELD, LG TARONE, RE SAYER, AM COOKFAIR, DL WACTAWSKIWENDE, J INSKIP, PD BLOCK, AMW RAMESH, KH BOICE, JD AF KLEINERMAN, RA LITTLEFIELD, LG TARONE, RE SAYER, AM COOKFAIR, DL WACTAWSKIWENDE, J INSKIP, PD BLOCK, AMW RAMESH, KH BOICE, JD TI CHROMOSOME-ABERRATIONS IN LYMPHOCYTES FROM WOMEN IRRADIATED FOR BENIGN AND MALIGNANT GYNECOLOGICAL DISEASE SO RADIATION RESEARCH LA English DT Article ID PERIPHERAL-BLOOD LYMPHOCYTES; ACTIVE BONE-MARROW; CONTROL POPULATION; X-IRRADIATION; RADIATION; CANCER; RADIOTHERAPY; FREQUENCY; LEUKEMIA; CERVIX AB Excess leukemias have occurred after partial-body radiotherapy for cervical cancer and benign gynecological disease (BGD). However, the level of risk is nearly the same in both groups, about twofold, despite a tenfold difference in average dose to active bone marrow (8 Gy vs 0.7 Gy, respectively). High-dose cell killing has been postulated as one explanation for this apparent inconsistency. To examine whether chromosome aberration rates observed in lymphocytes many years after exposure might serve as population markers of cancer risk, blood samples were taken from 60 women treated for BGD (34 with radiation) and cytogenetic data compared with previous results from 96 women irradiated for cervical cancer. Remarkably, the rate of stable aberrations, which reflects nonlethal damage in surviving stem cells, was only slightly higher among the cancer patients. Thus the lower-dose regimens to treat benign disorders resulted in much higher aberration yields per unit dose than those for cervical cancer. Assuming that the fraction of cytogenetically aberrant stem cells that survive radiotherapy contributes to the leukemogenic process, these data are then consistent with the epidemiological observations of comparable overall leukemia risks seen in these two irradiated populations. Accordingly, for patient populations given partial-body radiotherapy, stable aberrations at a long time after exposure appear to serve as biomarkers of effective risk rather than as biomarkers of radiation dose received. C1 OAK RIDGE INST SCI & EDUC, DIV MED SCI, OAK RIDGE, TN 37831 USA. NCI, BIOSTAT BRANCH, BETHESDA, MD 20892 USA. UNIV BUFFALO SUNY, DEPT NEUROL, BUFFALO, NY 14222 USA. UNIV BUFFALO SUNY, DEPT SOCIAL & PREVENT MED, BUFFALO, NY 14214 USA. SUNY BUFFALO, SCH MED & BIOMED SCI, DEPT GYNECOL & OBSTET, NEW YORK, NY 14219 USA. SUNY BUFFALO, SCH MED & BIOMED SCI, DEPT SOCIAL & PREVENT MED, NEW YORK, NY 14219 USA. ROSWELL PK CANC INST, CLIN CYTOGENET LAB, BUFFALO, NY 14263 USA. RP NCI, RADIAT EPIDEMIOL BRANCH, EPN 408, BETHESDA, MD 20892 USA. OI Kleinerman, Ruth/0000-0001-7415-2478 FU NCI NIH HHS [N01-CP9-5614, Y01-CP-80505, N01-CP8-5604] NR 30 TC 23 Z9 24 U1 0 U2 1 PU RADIATION RESEARCH SOC PI LAWRENCE PA 810 E TENTH STREET, LAWRENCE, KS 66044 USA SN 0033-7587 EI 1938-5404 J9 RADIAT RES JI Radiat. Res. PD JUL PY 1994 VL 139 IS 1 BP 40 EP 46 DI 10.2307/3578730 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA NU848 UT WOS:A1994NU84800006 PM 8016306 ER PT J AU KHAN, MA CROSS, FT JOSTES, R HUI, E MORRIS, JE BROOKS, AL AF KHAN, MA CROSS, FT JOSTES, R HUI, E MORRIS, JE BROOKS, AL TI MICRONUCLEI INDUCED BY RADON AND ITS PROGENY IN DEEP-LUNG FIBROBLASTS OF RATS IN-VIVO AND IN-VITRO SO RADIATION RESEARCH LA English DT Article ID CHROMOSOMAL-ABERRATIONS; GENE-MUTATIONS; DAUGHTER DOSIMETRY; ALPHA-PARTICLES; INDUCTION; INVIVO; CELLS AB Genotoxic damage induced by radon and its progeny was investigated using the micronucleus assay in deep-lung fibroblasts to compare the response induced in vitro with that induced from inhalation of radon and its progeny in vivo. Male Wistar rats were exposed to 0, 115, 213 and 323 working-level months (WLM) of radon and its progeny by inhalation. After sacrifice, the tells were isolated and grown in culture, and the frequency of micronuclei was determined. A linear increase in the frequency of micronuclei was measured as a function of exposure [micronuclei/1000 binucleated cells = (29 +/- 9) + (0.47 +/- 0.04) WLM]. To compare exposure in WLM to dose in mGy, and to study how cell proliferation influences the way inhalation of radon and its progeny induces micronuclei, lung fibroblasts were isolated and exposed in vitro to graded doses from radon and its progeny after either 16 or 96 h in tissue culture. Cell cycle stage at the time of exposure was determined using flow cytometry. Primary lung fibroblasts exposed as either nondividing or dividing cells showed dose-dependent increases in micronuclei [micronuclei/1000 binucleated cells = (33 +/- 40) + (593 +/- 68)D and micronudei/1000 binucleated cells = (27 +/- 69) + (757 +/- 88)D, respectively, where D is dose in Gy]. Results showed no significant influence (P = 0.20) of cell proliferation at the time of exposure on the frequency of micronuclei induced by radon and its progeny. Comparing dose-response relationships for nondividing cells to the exposure response for cells exposed by inhalation of radon and its progeny, it was estimated that a 1-WLM exposure in vivo caused the same amount of cytogenetic damage as produced by 0.79 mGy in vitro. In vivo/in vitro research using the micronucleus assay in lung fibroblasts serves as a powerful tool to estimate effective dose to cells in the respiratory tract after inhalation of radon and its progeny. Such studies form the basis for understanding the relationship between exposure, dose and biological damage. C1 PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 34 TC 25 Z9 25 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 JUL PY 1994 VL 139 IS 1 BP 53 EP 59 DI 10.2307/3578732 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA NU848 UT WOS:A1994NU84800008 PM 8016308 ER PT J AU GROSS, R KOELLE, D AF GROSS, R KOELLE, D TI LOW-TEMPERATURE SCANNING ELECTRON-MICROSCOPY OF SUPERCONDUCTING THIN-FILMS AND JOSEPHSON-JUNCTIONS SO REPORTS ON PROGRESS IN PHYSICS LA English DT Review ID HIGH-TC SUPERCONDUCTORS; SPATIALLY RESOLVED OBSERVATION; CRITICAL CURRENT-DENSITY; SINGLE GRAIN-BOUNDARIES; NB/ALOX/NB TUNNEL-JUNCTIONS; ABRIKOSOV FLUX LATTICE; THERMAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; BALLISTIC PHONONS; DC-SQUIDS AB By extending scanning electron microscopy to the temperature regime of liquid helium and nitrogen a powerful technique for the imaging of the local properties of superconducting thin films and Josephson junctions is obtained. Low temperature scanning electron microscopy (LTSEM) allows one both to investigate interesting physical phenomena in superconducting thin film samples with a spatial resolution of about 1 mum and to perform a functional test of superconducting devices and circuits at their operation temperature. We discuss the technical and physical background of the LTSEM imaging technique including the electron optical and cryogenic requirements, the interaction of the electron beam with the superconducting sample, the dynamics of the electron beam induced non-equilibrium state, and the electron beam induced signal. The origin of spatial structures in superconducting thin films and Josephson junctions and their spatially resolved analysis by LTSEM is reviewed. The use of LTSEM in the functional test of both low- and high-temperature superconducting thin films, devices, and circuits is summarized. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP GROSS, R (reprint author), UNIV TUBINGEN,INST PHYS,LEHRSTUHL EXPTL PHYS 2,MORGENSTELLE 14,D-72076 TUBINGEN,GERMANY. RI Koelle, Dieter/E-5111-2011; Gross, Rudolf/A-6227-2012 OI Gross, Rudolf/0000-0003-4524-7552 NR 289 TC 108 Z9 108 U1 0 U2 7 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0034-4885 J9 REP PROG PHYS JI Rep. Prog. Phys. PD JUL PY 1994 VL 57 IS 7 BP 651 EP 741 DI 10.1088/0034-4885/57/7/001 PG 91 WC Physics, Multidisciplinary SC Physics GA NY958 UT WOS:A1994NY95800001 ER PT J AU NAGY, Z YOU, H YONCO, RM AF NAGY, Z YOU, H YONCO, RM TI CELL DESIGN FOR IN-SITU X-RAY-SCATTERING STUDIES OF METAL SOLUTION INTERFACES UNDER ELECTROCHEMICAL CONTROL SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID TRANSMISSION GEOMETRY; DIFFRACTION; ELECTRODES; REFLECTIVITY AB During the last decade, there has been an increasing use of synchrotron x-ray techniques for the in situ investigation of the structure and composition of metal/solution interfaces under electrochemical control. While a number of experimental cell designs have been utilized in the past, every one of them has exhibited some shortcomings. This paper describes the development of a wide-angle-accessible, transmission-geometry, sandwich-type, x-ray/electrochemical cell. From an x-ray physics standpoint, this cell allows uninterrupted access over a 180-degrees in-plane angle for all incident and scattering angles between 0-degrees and 75-degrees with respect to the sample surface. It is especially advantageous at small scattering angles because of the uniform and insignificant background scattering. From an electrochemical standpoint, this cell provides a uniform current distribution and continuous, precise potential control of the working-electrode surface; at the same time, it permits easy flushing of the working solution and even accommodates operating with flowing solution. Its only disadvantage is its inability to permit in situ cyclic voltammetry of only one surface of the single crystal. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. RP NAGY, Z (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 19 TC 18 Z9 18 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1994 VL 65 IS 7 BP 2199 EP 2205 DI 10.1063/1.1144727 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NW644 UT WOS:A1994NW64400006 ER PT J AU LEE, PL BENO, MA KNAPP, GS JENNINGS, G AF LEE, PL BENO, MA KNAPP, GS JENNINGS, G TI CONTINUOUS ENERGY DIFFRACTION SPECTROSCOPY - A NEW D-SPACE MATCHING TECHNIQUE FOR ENERGY-DISPERSIVE SYNCHROTRON-RADIATION DIFFRACTION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID BENT TRIANGULAR MONOCHROMATOR; ANOMALOUS-SCATTERING; X-RADIATION; VALENCE; CONTRAST; PROFILE; MODE AB In this article, a new technique, continuous energy diffraction spectroscopy (CEDS) is described, for diffraction experiments using a synchrotron energy dispersive polychromatic beamline. This type of beamline uses a curved crystal monochromator (polychromator) to focus a range of x-ray energies (bandwidth approximately 1 keV) into a narrow (100-120 mum) line image. With a sample at this image point, using an 2D detector, we are able to measure diffracted intensities for the entire energy range of the incident beam simultaneously with limited or no motion of the sample. This method allows the collection of anomalous scattering and diffraction anomalous fine structure (DAFS) data faster and more accurately than with conventional methods. Because of the speed with which these types of diffraction experiments can be done, this method creates new options for time resolved diffraction experiments and provides new data collection strategies. RP LEE, PL (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 16 TC 6 Z9 6 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 JUL PY 1994 VL 65 IS 7 BP 2206 EP 2209 DI 10.1063/1.1144728 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NW644 UT WOS:A1994NW64400007 ER PT J AU HULSE, RA AF HULSE, RA TI THE DISCOVERY OF THE BINARY PULSAR SO REVIEWS OF MODERN PHYSICS LA English DT Editorial Material RP HULSE, RA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 4 TC 64 Z9 65 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 J9 REV MOD PHYS JI Rev. Mod. Phys. PD JUL PY 1994 VL 66 IS 3 BP 699 EP 710 DI 10.1103/RevModPhys.66.699 PG 12 WC Physics, Multidisciplinary SC Physics GA PG736 UT WOS:A1994PG73600001 ER PT J AU SHEFFIELD, J AF SHEFFIELD, J TI THE PHYSICS OF MAGNETIC FUSION-REACTORS SO REVIEWS OF MODERN PHYSICS LA English DT Review ID REVERSED-FIELD-PINCH; TOROIDAL ALFVEN EIGENMODES; ALPHA-PARTICLE LOSSES; L-H TRANSITION; ISX-B TOKAMAK; THERMONUCLEAR EXPERIMENTAL REACTOR; PELLET INJECTION TECHNOLOGY; GRADIENT-DRIVEN TURBULENCE; COMPACT TORSATRON REACTORS; ION THERMAL-CONDUCTIVITY AB During the past two decades there have been substantial advances in magnetic fusion research. On the experimental front, progress has been led by the mainline tokamaks, which have achieved reactor-level values of temperature and plasma pressure. Comparable progress, when allowance is made for their smaller programs, has been made in complementary configurations such as the stellarator, reversed-field pinch and field-reversed configuration. In this paper, the status of understanding of the physics of toroidal plasmas is reviewed. It is shown how the physics performance, constrained by technological and economic realities, determines the form of reference toroidal reactors. A comparative study of example reactors is not made, because the level of confidence in projections of their performance varies widely, reflecting the vastly different levels of support which each has received. Success with the tokamak has led to the initiation of the International Thermonuclear Experimental Reactor project. It is designed to produce 1500 MW of fusion power from a deuterium-tritium plasma for pulses of 1000 s or longer and to demonstrate the integration of the plasma and nuclear technologies needed for a demonstration reactor. RP OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 521 TC 53 Z9 53 U1 5 U2 25 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 EI 1539-0756 J9 REV MOD PHYS JI Rev. Mod. Phys. PD JUL PY 1994 VL 66 IS 3 BP 1015 EP 1103 DI 10.1103/RevModPhys.66.1015 PG 89 WC Physics, Multidisciplinary SC Physics GA PG736 UT WOS:A1994PG73600009 ER PT J AU PANESSAWARREN, BJ TORTORA, GT WARREN, JB AF PANESSAWARREN, BJ TORTORA, GT WARREN, JB TI ELECTRON-MICROSCOPY OF C-SPOROGENES ENDOSPORE ATTACHMENT AND GERMINATION SO SCANNING LA English DT Article DE CLOSTRIDIUM; ENDOSPORE; SEM; MORPHOLOGY; ATTACHMENT; GERMINATION; HISTOCHEMISTRY; HIGH RESOLUTION SEM ID X-RAY-MICROANALYSIS; CALCIUM; SPORES AB The bacterial endospores of C. sporogenes ATCC 3584 are quite small (approximately 0.7-1.0 mum in length) and are difficult to examine during the attachment and germination process by conventional light microscopy methods. Although transmission electron microscopy provides high magnification and resolution, it has not been possible to date to visualize the attachment process and surface changes of intact clostridial endospores. With the advent of higher resolution conventional scanning electron microscopes (SEM), it is now possible to study these small spores attached to their nutrient substrate in their intact state and readily obtain detailed morphologic information about the attachment, germination, and outgrowth process. Spores were examined in their dormant, dehydrated state and allowed to germinate. Samples were prepared for light, transmission, and SEM under anaerobic conditions for morphologic and histochemical examination. SEM revealed that the spores developed a distinct polarity at the beginning of the germination process and that the exosporial membrane at this time produced projections that attached the spore to a substrate. These projections were altered by calcium chelation with EDTA and the presence of barium. Following colchicine and cytochalasin B treatment, the exosporial membrane projections were morphologically altered and the germination sequence was modified. Histochemical examination of the spores suggested that calcium was predominantly located in the protoplast and spore coat. C1 BROOKHAVEN NATL LAB,DIV INSTRUMENTAT,UPTON,NY 11973. RP PANESSAWARREN, BJ (reprint author), SUNY STONY BROOK UNIV HOSP,HLTH SCI CTR LMRM30,SCH HLTH TECHNOL & MANAGEMENT,DEPT MED TECHNOL,STONY BROOK,NY 11794, USA. NR 24 TC 7 Z9 7 U1 1 U2 4 PU FAMS INC PI MAHWAH PA BOX 832, MAHWAH, NJ 07430 SN 0161-0457 J9 SCANNING JI Scanning PD JUL-AUG PY 1994 VL 16 IS 4 BP 227 EP 240 PG 14 WC Instruments & Instrumentation; Microscopy SC Instruments & Instrumentation; Microscopy GA NZ277 UT WOS:A1994NZ27700007 ER PT J AU COLSON, SD DUNNING, TH AF COLSON, SD DUNNING, TH TI THE STRUCTURE OF NATURES SOLVENT - WATER SO SCIENCE LA English DT Editorial Material RP COLSON, SD (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 7 TC 42 Z9 42 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 1 PY 1994 VL 265 IS 5168 BP 43 EP 44 DI 10.1126/science.265.5168.43 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NV301 UT WOS:A1994NV30100021 PM 17774687 ER PT J AU OKADA, A KAWAGUCHI, N HAMILTON, ML HAMADA, K YOSHIIE, T ISHIDA, I HIROTA, E AF OKADA, A KAWAGUCHI, N HAMILTON, ML HAMADA, K YOSHIIE, T ISHIDA, I HIROTA, E TI MECHANICAL-PROPERTIES OF NEUTRON-IRRADIATED FE-CR AND FE-MN ALLOYS SO SCIENCE REPORTS OF THE RESEARCH INSTITUTES TOHOKU UNIVERSITY SERIES A-PHYSICS CHEMISTRY AND METALLURGY LA English DT Article DE MECHANICAL PROPERTY; NEUTRON IRRADIATION; DEFECT CLUSTER; VOIDS; DISLOCATION LOOPS; YIELD STRENGTH; STRAIN HARDENING EXPONENT AB The mechanical property change due to the evolution of defect structures by the irradiation of neutrons was investigated on several Fe-Cr and Fe-Mn alloys irradiated in the JMTR and FFTF. With increase in manganese levels, dislocation loop density increases much larger than for chromium levels in irradiation in the JMTR, while in the FFTF, dislocation density of the Fe-Cr alloys is much larger than in the Fe-Mn alloys. This reverse trend is brought about by the saturation in the development of dislocation loops. The Fe-0.1 and 0.4%Cr whose dislocation density is much lower than that of the Fe-2%Mn showed the increment in yield strength almost the same as that of the Fe-2%Cr and rather larger than that of the Fe-2%Mn, respectively, in the JMTR. Yield strength increase without significant variation in the strain hardening exponent is observed for the Fe-0.1%Cr and Fe-O.1%Mn irradiated in the FFTF and very small voids are observed in the Fe-0.1%Mn irradiated in the JMTR. These results suggest the existence of invisible defect clusters produced by irradiation. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. KYOTO UNIV, INST RES REACTOR, KUMATORI, OSAKA 59004, JAPAN. RP OKADA, A (reprint author), HOKKAIDO UNIV, FAC ENGN, DEPT PRECIS ENGN, SAPPORO, HOKKAIDO 060, JAPAN. NR 8 TC 0 Z9 0 U1 0 U2 0 PU INST MATERIALS RESEARCH LIBRARY PI SENDAI PA TOHOKU UNIV KATAHIRA 2-1-1, SENDAI 980, JAPAN SN 0040-8808 J9 SCI REP RES TOHOKU A JI Sci. Rep. Res. Inst. Tohoku Univ. Ser. A-Phys. Chem. Metall. PD JUL PY 1994 VL 40 IS 1 BP 57 EP 62 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PK787 UT WOS:A1994PK78700011 ER PT J AU ALEXANDER, JB AF ALEXANDER, JB TI PSYCHICS AND WEAPONS SO SCIENTIFIC AMERICAN LA English DT Letter RP ALEXANDER, JB (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD JUL PY 1994 VL 271 IS 1 BP 10 EP 10 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NT272 UT WOS:A1994NT27200001 ER PT J AU DUNCAN, AJ KAUFMAN, MJ SCHNEIBEL, JH AF DUNCAN, AJ KAUFMAN, MJ SCHNEIBEL, JH TI TESTING OF SOFT-ORIENTED NIAL SINGLE-CRYSTALS IN SIMPLE SHEAR SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP DUNCAN, AJ (reprint author), UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611, USA. RI Kaufman, Michael/A-7737-2012 NR 17 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 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1994 VL 31 IS 1 BP 105 EP 109 DI 10.1016/0956-716X(94)90103-1 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NH236 UT WOS:A1994NH23600020 ER PT J AU KICKERT, RN AF KICKERT, RN TI ECOLOGICAL MODELING - HOW IT COULD BE VS HOW IT IS NOW SO SIMULATION LA English DT Editorial Material RP KICKERT, RN (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SIMULATION COUNCILS INC PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92117 SN 0037-5497 J9 SIMULATION JI Simulation PD JUL PY 1994 VL 63 IS 1 BP 66 EP 68 PG 3 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering SC Computer Science GA NX946 UT WOS:A1994NX94600011 ER PT J AU FARHAR, BC AF FARHAR, BC TI ENERGY AND ENVIRONMENT - THE POLICY CHALLENGE - BYRNE,J, RICH,D SO SOCIETY & NATURAL RESOURCES LA English DT Book Review RP FARHAR, BC (reprint author), NATL RENEWABLE ENERGY LAB,WASHINGTON,DC, 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 0894-1920 J9 SOC NATUR RESOUR JI Soc. Nat. Resour. PD JUL-AUG PY 1994 VL 7 IS 4 BP 400 EP 403 PG 4 WC Environmental Studies; Planning & Development; Sociology SC Environmental Sciences & Ecology; Public Administration; Sociology GA PD845 UT WOS:A1994PD84500010 ER PT J AU SMITH, CC LOF, G JONES, R AF SMITH, CC LOF, G JONES, R TI MEASUREMENT AND ANALYSIS OF EVAPORATION FROM IN INACTIVE OUTDOOR SWIMMING POOL SO SOLAR ENERGY LA English DT Article AB Evaporation rates and total energy loads from an unoccupied, heated, outdoor pool in Fort Collins, Colorado were investigated. Pool and air temperatures, humidity, thermal radiation, wind speed, and water loss due to evaporation were measured over 21 test periods ranging from 1.1 to 16.2 hours during August and September, 1992. Data were analyzed and compared to commonly used evaporation rate equations, most notably that used in the ASHRAE Applications Handbook. Measured evaporation was 72% of the ASHRAE calculated value with near-zero wind velocity, and 82% of the ASHRAE value at 2.2 m/s wind velocity. A modified version of the ASHRAE equation was developed. Two overnight tests showed energy loss of 56% by evaporation, 26% by radiation, and 18% by convection. A correlation between radiation loss and temperatures was also found for the range of test conditions. C1 US DOE,DENVER SUPPORT OFF,GOLDEN,CO 80401. RP SMITH, CC (reprint author), COLORADO STATE UNIV,SOLAR ENERGY APPLICAT LAB,FT COLLINS,CO 80523, USA. NR 12 TC 33 Z9 34 U1 1 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-092X J9 SOL ENERGY JI Sol. Energy PD JUL PY 1994 VL 53 IS 1 BP 3 EP 7 DI 10.1016/S0038-092X(94)90597-5 PG 5 WC Energy & Fuels SC Energy & Fuels GA NR079 UT WOS:A1994NR07900002 ER PT J AU LAMPERT, CM AF LAMPERT, CM TI TOWARDS LARGE-AREA PHOTOVOLTAIC NANOCELLS - EXPERIENCES LEARNED FROM SMART WINDOW TECHNOLOGY (VOL 32, PG 307, 1994) SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Correction, Addition RP LAMPERT, CM (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BLDG TECHNOL PROGRAM,MS62-203,BERKELEY,CA 94721, USA. NR 1 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUL PY 1994 VL 33 IS 3 BP 389 EP 389 PG 1 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA PC306 UT WOS:A1994PC30600011 ER PT J AU MOSKOWITZ, PD FTHENAKIS, VM CRANDALL, RS NELSON, BP AF MOSKOWITZ, PD FTHENAKIS, VM CRANDALL, RS NELSON, BP TI ANALYZING RISKS ASSOCIATED WITH HAZARDOUS PRODUCTION MATERIALS SO SOLID STATE TECHNOLOGY LA English DT Article AB Major safety improvement efforts have been initiated at US Department of Energy national laboratories. These are supported by formal audits of the environmental, health, and safety programs. One self-appraisal was prepared by the National Renewable Energy Laboratory in Golden, CO, where toxic and hazardous gases are used to produce photovoltaic devices. This article summarizes the strategy implemented to prepare the safety analysis review and highlights the findings of the study. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NATL RENEWABLE ENERGY LAB,GOLDEN,CO. COLUMBIA UNIV,NEW YORK,NY 10027. CUNY,NEW YORK,NY 10021. RP MOSKOWITZ, PD (reprint author), BROOKHAVEN NATL LAB,CTR PHOTOVOLTA ENVIRONM HLTH & SAFETY INFORMAT,UPTON,NY 11973, USA. NR 3 TC 4 Z9 4 U1 0 U2 1 PU PENNWELL PUBL CO SOLID STATE TECHNOLOGY OFFICE PI NASHUA PA TEN TARA BLVD 5TH FLOOR, NASHUA, NH 03062-2801 SN 0038-111X J9 SOLID STATE TECHNOL JI Solid State Technol. PD JUL PY 1994 VL 37 IS 7 BP 121 EP & PG 0 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NX661 UT WOS:A1994NX66100019 ER PT J AU LAM, NQ OKAMOTO, PR AF LAM, NQ OKAMOTO, PR TI GENERALIZED MELTING CRITERION FOR BEAM-INDUCED AMORPHIZATION SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 8th International Conference on Surface Modification of Metals by Ion Beams CY SEP 13-17, 1993 CL KANAZAWA, JAPAN SP INST PHYS & CHEM RES, IND RES INST ISHIKAWA, JAPANESE SOC SURFACE LAYER MODIFICAT ION IMPLANTAT, BEAM ENGN RES SOC JAPAN, AMADA FDN MET WORK TECHNOL, KANAZAWA CONVENT BUR, JAPAN SOC APPL PHYS, CHEM SOC JAPAN, JAPAN INST MET, JAPAN SOC PRECIS ENGN, IRON & STEEL INST JAPAN, ELECTROCHEM SOC JAPAN, INST ELECT ENGINEERS JAPAN, VACUUM SOC JAPAN, SURFACE SCI SOC JAPAN, SURFACE FINISHING SOC JAPAN ID SOLID-STATE AMORPHIZATION; IRRADIATION-INDUCED AMORPHIZATION; TRANSMISSION ELECTRON-MICROSCOPY; RADIATION-INDUCED AMORPHIZATION; TEMPERATURE SPECIFIC-HEAT; INTERMETALLIC COMPOUNDS; MOLECULAR-DYNAMICS; AMORPHOUS TRANSITION; METALLIC GLASSES; SINGLE-CRYSTALS AB Recent studies have shown that the mean-square static atomic displacements provide a generic measure of the enthalpy stored in the lattice in the form of chemical and topological disorder, and that the effect of the displacements on the softening of shear elastic constants is identical to that of heating. This finding lends support to a generalized form of the Lindemann phenomenological melting criterion and leads to a natural interpretation of crystalline-to-amorphous transformations as defect-induced melting of metastable crystals driven beyond a critical state of disorder where the melting temperature falls below the glass transition temperature. Application of the generalized Lindemann criterion to both the crystalline and the amorphous phases indicates that the enthalpies of the two phases become identical when their shear moduli become equal. This thermoelastic rule provides a basis for predicting the relative susceptibility of compounds to amorphization in terms of their elastic properties as measured by Debye temperatures. The present approach can explain many of the basic findings on beam-induced amorphization of intermetallic compounds as well as amorphous phase formation associated with ion implantation, ion beam mixing and other solid state processes. RP LAM, NQ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 51 TC 11 Z9 11 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD JUL PY 1994 VL 65 IS 1-3 BP 7 EP 14 DI 10.1016/S0257-8972(94)80002-2 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NX760 UT WOS:A1994NX76000003 ER PT J AU MCHARGUE, CJ JOSLIN, DL PAWEL, JE ROMANA, L WHITE, CW AF MCHARGUE, CJ JOSLIN, DL PAWEL, JE ROMANA, L WHITE, CW TI DESIGN OF METAL SAPPHIRE INTERFACES FOR ENHANCED ADHESION SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 8th International Conference on Surface Modification of Metals by Ion Beams CY SEP 13-17, 1993 CL KANAZAWA, JAPAN SP INST PHYS & CHEM RES, IND RES INST ISHIKAWA, JAPANESE SOC SURFACE LAYER MODIFICAT ION IMPLANTAT, BEAM ENGN RES SOC JAPAN, AMADA FDN MET WORK TECHNOL, KANAZAWA CONVENT BUR, JAPAN SOC APPL PHYS, CHEM SOC JAPAN, JAPAN INST MET, JAPAN SOC PRECIS ENGN, IRON & STEEL INST JAPAN, ELECTROCHEM SOC JAPAN, INST ELECT ENGINEERS JAPAN, VACUUM SOC JAPAN, SURFACE SCI SOC JAPAN, SURFACE FINISHING SOC JAPAN ID FILMS AB The roles of defect-induced and impurity-induced changes in interfacial energy on the adhesion of metal films on sapphire substrates were studied using ion implantation. Chemical species that decrease (Cr) or increase (Ni) the interfacial free energy of iron-sapphire interfaces were implanted at the interface. Effects of irradiation-produced defects were studied by implanting iron to a similar concentration in companion iron/sapphire samples and by bombarding Cr/sapphire couples. Rutherford backscattering-channeling, Auger electron spectroscopy, and X-ray photoelectron spectroscopy indicated that only recoil mixing occurred and that the intermixed region was limited to several nanometers in thickness. Measurements using a pull test and a scratch test revealed a marked increase in adhesion for Cr implantations, a modest increase for Fe implantation, and no change for the Ni implantations. It is proposed that both chemical changes and irradiation-produced defects increase the work of adhesion by decreasing the interfacial free energy. In the Ni-implanted samples, the two effects annul each other. A role for irradiation-produced defects was confirmed by the increase in adhesion observed for ion-bombarded chromium films on sapphire. The already very low interfacial energy was further decreased by the presence of irradiation-produced defects. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MCHARGUE, CJ (reprint author), UNIV TENNESSEE,CTR MAT PROC,KNOXVILLE,TN 37996, USA. NR 15 TC 0 Z9 0 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD JUL PY 1994 VL 65 IS 1-3 BP 198 EP 202 DI 10.1016/S0257-8972(94)80032-4 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NX760 UT WOS:A1994NX76000033 ER PT J AU BATTEAS, JD BARBIERI, A STARKEY, EK VANHOVE, MA SOMORJAI, GA AF BATTEAS, JD BARBIERI, A STARKEY, EK VANHOVE, MA SOMORJAI, GA TI A TENSOR LEED ANALYSIS OF THE RH(110)-P2MG(2X1)-2CO STRUCTURE SO SURFACE SCIENCE LA English DT Article ID ENERGY-ELECTRON-DIFFRACTION; X-RAY-ABSORPTION; CARBON-MONOXIDE; PHOTOELECTRON DIFFRACTION; SURFACE CRYSTALLOGRAPHY; MOLECULAR ADSORPTION; INTENSITY ANALYSIS; SITE ASSIGNMENT; FINE-STRUCTURE; DISORDERED CO AB The structural geometries of both the clean and CO covered Rh(110) surfaces have been determined by a LEED intensity analysis. The clean surface exhibits a top layer contraction of 0.09 +/- 0.02 angstrom and a second layer expansion of 0.03 +/- 0.03 angstrom relative to the bulk interlayer spacing. Upon the adsorption of 1 ML of CO the molecules are arranged in a zig-zag fashion along the [110BAR] direction to produce the observed glide plane symmetry in the LEED pattern. The clean surface relaxations are removed and each CO bonds near a short bridge site with the CO molecular axis oriented approximately 24-degrees from the surface normal. This bonding geometry results in a Rh-C bond length of 1.97 +/- 0.09 angstrom and a C-O bond length of 1.13 +/- 0.09 angstrom. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. 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 48 TC 18 Z9 19 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 1 PY 1994 VL 313 IS 3 BP 341 EP 348 DI 10.1016/0039-6028(94)90054-X PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NV654 UT WOS:A1994NV65400014 ER PT J AU COHEN, JM VOTER, AF AF COHEN, JM VOTER, AF TI CONVERGENCE OF SURFACE-DIFFUSION PARAMETERS WITH MODEL CRYSTAL SIZE SO SURFACE SCIENCE LA English DT Article ID SELF-DIFFUSION; DYNAMICAL CORRECTIONS; SINGLE ADATOMS; FCC METALS; TEMPERATURE; ENERGY; SIMULATION; CONSTANTS; MIGRATION; PT(001) AB A study of the variation in the calculated quantities for adatom diffusion with respect to the size of the model crystal is presented. The reported quantities include surface diffusion barrier heights, pre-exponential factors, and dynamical correction factors. Embedded atom method (EAM) potentials were used throughout this effort. Both the layer size and the depth of the crystal were found to influence the values of the Arrhenius factors significantly. In particular, exchange type mechanisms required a significantly larger model than standard hopping mechanisms to determine adatom diffusion barriers of equivalent accuracy. The dynamical events that govern the corrections to transition state theory (TST) did not appear to be as sensitive to crystal depth. Suitable criteria for the convergence of the diffusion parameters with regard to the rate properties are illustrated. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP COHEN, JM (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT PHYS,SOCORRO,NM 87801, USA. NR 41 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 1 PY 1994 VL 313 IS 3 BP 439 EP 447 DI 10.1016/0039-6028(94)90063-9 PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NV654 UT WOS:A1994NV65400023 ER PT J AU ASHBY, CR EDWARDS, E WANG, RY AF ASHBY, CR EDWARDS, E WANG, RY TI ELECTROPHYSIOLOGICAL EVIDENCE FOR A FUNCTIONAL INTERACTION BETWEEN 5-HT1A AND 5-HT2A RECEPTORS IN THE RAT MEDIAL PREFRONTAL CORTEX - AN IONTOPHORETIC STUDY SO SYNAPSE LA English DT Article DE MEDIAL PREFRONTAL CORTEX; 5-HT1A RECEPTORS; 5-HT2 RECEPTORS; MICROIONTOPHORESIS; ELECTROPHYSIOLOGY ID SEROTONIN RECEPTORS; BEHAVIORAL EVIDENCE; BRAIN; LOCALIZATION; NUCLEUS; 5-HYDROXYTRYPTAMINE2; 5-HT2-RECEPTOR; RESPONSES; SUBTYPES; AGONIST AB In this study, we examined the interaction of 5-HT1A and 5-HT2A receptors in the rat medial prefrontal cortex (mPFc) using the techniques of extracellular single unit recording and microiontophoresis. The iontophoresis of the selective 5-HT1A receptor agonist (+/-)-8-hydroxy-2-(di-n-propylamino) tetralin (8-OHDPAT) produced a current-dependent suppression (2.5-20 nA) of the basal firing rate of spontaneously active mPFc cells. The iontophoretic (5-10 nA) and systemic administration (0.1-0.5 mg/kg, i.v.) of the 5-HT2A/5-HT2C receptor antagonist ritanserin and the selective 5-HT2A receptor antagonist MDL 28727 significantly potentiated and prolonged 8-OHDPAT's suppressant action. In addition, the systemic administration of another selective 5-HT2A antagonist MDL 100907, but not its less active enantiomer MDL 100009, also potentiated and prolonged 8-OHDPAT's action. The potentiating effect of the 5-HT2A receptor antagonists on the action of 8-OHDPAT is specific in that neither the iontophoresis of ritanserin nor MDL 28727 altered the suppressant action produced by the iontophoresis of the 5-HT3 receptor agonist 2-methylserotonin onto mPFc cells. Moreover, the suppressant action of 8-OHDPAT was not altered by the systemic administration of the selective 5-HT3 receptor antagonist granisetron (0.1-0.5 mg/kg, i.v.). On the other hand, the iontophoresis of a low current (0.5 nA) of the 5-HT2A,2C receptor agonist (+/-)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) potentiated the excitation induced by the iontophoresis of 1-glutamate on quiescent mPFc cells. The iontophoresis of 8-OHDPAT at a current that had no effect on the firing rate of 1-glutamate activated when administered alone significantly attenuated the excitatory action produced by the iontophoresis of DOI. Overall, these results confirm and extend the hypothesis that there is an interaction between 5-HT1A and 5-HT2A receptors in the mPFc at the neuronal level. (C) 1994 Wiley-Liss, Inc. C1 SUNY STONY BROOK,DEPT PSYCHIAT & BEHAV SCI,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. UNIV MARYLAND,BALTIMORE,MD 21201. FU NIDA NIH HHS [DA 07193] NR 30 TC 89 Z9 91 U1 0 U2 0 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 JUL PY 1994 VL 17 IS 3 BP 173 EP 181 DI 10.1002/syn.890170306 PG 9 WC Neurosciences SC Neurosciences & Neurology GA NU319 UT WOS:A1994NU31900005 PM 7974200 ER PT J AU SAA, C CROTTS, DD HSU, G VOLLHARDT, KPC AF SAA, C CROTTS, DD HSU, G VOLLHARDT, KPC TI A COBALT-CATALYZED ENTRY INTO THE ERGOT ALKALOIDS - TOTAL SYNTHESES OF +/--LYSERGENE AND +/--LSD SO SYNLETT LA English DT Note ID ACID DERIVATIVES; 2,3-DOUBLE BOND; ALKYNES; CONSTRUCTION; CYCLIZATION; CHEMISTRY; NUCLEUS AB Cocyclization of 4-ethynyl-3-indoleacetonitriles with alkynes in the presence of CpCo(CO)2 gives rise to the ergoline derivatives 6-9, two of which were transformed into racemic lysergene and LSD, respectively. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP SAA, C (reprint author), UNIV SANTIAGO COMPOSTELA,DEPT QUIM ORGAN,E-27002 LUGO,SPAIN. RI Saa, Carlos/P-9001-2014 OI Saa, Carlos/0000-0003-3213-4604 NR 33 TC 85 Z9 85 U1 1 U2 16 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0936-5214 J9 SYNLETT JI Synlett PD JUL PY 1994 IS 7 BP 487 EP 489 PG 3 WC Chemistry, Organic SC Chemistry GA NV653 UT WOS:A1994NV65300006 ER PT J AU MITCHELL, MA BENICEWICZ, BC AF MITCHELL, MA BENICEWICZ, BC TI SYNTHESIS OF DELTA(2)-1,3-OXAZOLINES AND DELTA(2)-1,3-OXAZINES USING POTASSIUM FLUORIDE ON ALUMINA SO SYNTHESIS-STUTTGART LA English DT Note ID OXAZOLINES; DELTA-2-THIAZOLINES; DELTA-2-OXAZOLINES; AMIDES AB Potassium fluoride (40 %) on alumina was used as a basic reagent for the ring closure of N-(beta- or gamma-haloalyl)amides to give Delta(2)-1,3-oxazolines and Delta(2)-1,3-oxazines, respectively. Various 2-alkyl and 2-aryl derivatives were synthesized in moderate to high yield under relatively mild conditions (KF/Al2O3, solvent, room temperature ). The procedure also facilitated simple workup and purification of the products. New compounds synthesized by this method are: 5-bromomethyl-2-phenyl-Delta(2)-1,3-oxazoline, 4,4-dimethyl-2-vinyl-Delta(2)-1,3-oxazoline, and 5-methylene-2-phenyl-Delta(2)-1,3-oxazine. The last compound represents the first authentic example of a 5-functionally substituted oxazine without substitution in the 4- or the 6-position. RP MITCHELL, MA (reprint author), LOS ALAMOS NATL LAB,POLYMERS & COATINGS GRP,POB 1663,LOS ALAMOS,NM 87545, USA. NR 25 TC 18 Z9 18 U1 0 U2 1 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0039-7881 J9 SYNTHESIS-STUTTGART JI Synthesis PD JUL PY 1994 IS 7 BP 675 EP 677 PG 3 WC Chemistry, Organic SC Chemistry GA NX337 UT WOS:A1994NX33700005 ER PT J AU HACKER, BC AF HACKER, BC TI SCIENCE WITH A VENGEANCE - HOW THE MILITARY CREATED THE UNITED-STATES SPACE SCIENCES AFTER WORLD-WAR-2 - DEVORKIN,DH SO TECHNOLOGY AND CULTURE LA English DT Book Review RP HACKER, BC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD JUL PY 1994 VL 35 IS 3 BP 628 EP 629 DI 10.2307/3106283 PG 2 WC History & Philosophy Of Science SC History & Philosophy of Science GA PP516 UT WOS:A1994PP51600020 ER PT J AU NOORISHAD, J TSANG, CF PERROCHET, P MUSY, A AF NOORISHAD, J TSANG, CF PERROCHET, P MUSY, A TI STREAMLINE UPWIND FULL GALERKIN METHOD FOR SOLUTION OF CONVECTION DOMINATED SOLUTE TRANSPORT PROBLEMS SO TRANSPORT IN POROUS MEDIA LA English DT Article DE SPACE-TIME FINITE ELEMENT METHODS; CONVECTION DOMINATED TRANSPORT; FULL PETROV GALERKIN ID EQUATION AB A new streamline method for the solution of convection-dominated transport problems is introduced. First, an analysis is made of the nature of classic streamline upwinding from the perspective of space and spacetime solution domains, as they pertain to the nature of the problems. From this analysis emerges a rigorous logic for upwinding, which can easily be implemented in the full (spacetime) Galerkin formulation of the transport equation. Comparative performance testing of this technique, in solving a number of examples, proves it to be robust and versatile. The advantage of this method resides in its applicability to a wider range of Courant numbers. C1 ECOLE POLYTECH FED LAUSANNE,INST GEN RURAL,CH-1015 LAUSANNE,SWITZERLAND. RP NOORISHAD, J (reprint author), LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720, USA. RI Perrochet, Pierre/J-1464-2014 NR 12 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0169-3913 J9 TRANSPORT POROUS MED JI Transp. Porous Media PD JUL PY 1994 VL 16 IS 1 BP 53 EP 74 DI 10.1007/BF01059776 PG 22 WC Engineering, Chemical SC Engineering GA PZ653 UT WOS:A1994PZ65300003 ER PT J AU ERDEMIR, A AF ERDEMIR, A TI CRYSTAL-CHEMISTRY AND SOLID LUBRICATING PROPERTIES OF THE MONOCHALCOGENIDES GALLIUM SELENIDE AND TIN SELENIDE SO TRIBOLOGY TRANSACTIONS LA English DT Article DE SOLID LUBRICATION; FRICTION ID MOS2 AB The interatomic array and bond structure in crystalline states of the monochalcogenides tin selenide and gallium selenide are described and correlated with their solid lubricating capacity. Friction tests assessing their solid lubricating performance were carried out on a pin-on-disk machine. Specifically, large crystalline pieces of each inorganic solid were cut and cleaved into flat squares and subsequently rubbed against sapphire balls. In another case, fine powders of gallium selenide and tin selenide were manually into the sliding interfaces of 440C pins and 440C disks. For the specific test conditions explored, friction coefficients of the sapphire/gallium selenide and sapphire/tin selenide pairs were approximately 0.23 and approximately 0.35, respectively. The friction coefficients of 440C pin/440C disk test pairs with gallium selenide and tin selenide powders were approximately 0.22 and approximately 0.38, respectively. For comparison, a number of parallel friction tests were also performed with MoS2 powders and compacts, and the results of these tests are reported. The friction data, together with the crystal-chemical knowledge and electron microscopy evidence, supported conclusion that the solid lubricating capabilities and lubrication mechanisms of these solids are closely related to their crystal chemistry and the nature of their interlayer bonding. RP ERDEMIR, A (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. NR 23 TC 3 Z9 3 U1 0 U2 5 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0569-8197 J9 TRIBOL T JI Tribol. Trans. PD JUL PY 1994 VL 37 IS 3 BP 471 EP 478 DI 10.1080/10402009408983319 PG 8 WC Engineering, Mechanical SC Engineering GA NW434 UT WOS:A1994NW43400005 ER PT J AU LUCCA, DA SEO, YW RHORER, RL AF LUCCA, DA SEO, YW RHORER, RL TI ENERGY-DISSIPATION AND TOOL WORKPIECE CONTACT IN ULTRA-PRECISION MACHINING SO TRIBOLOGY TRANSACTIONS LA English DT Article AB An experimental investigation was conducted to examine the dissipation of mechanical energy when machining at depths of cut less than several micrometers. Cutting and thrust forces which resulted in the orthogonal ultra-precision flycutting of Al 6061-T6 were measured over a range of depth of cut of 20 mum down to 0.01 mum at a cutting speed of 0.8 m.sec-1. Measurement of the tool-workpiece contact length indicated that it may become the characteristic length scale when machining at submicrometer depths of cut. Evidence suggests that the process may be viewed as transitioning from a cutting-dominant to plowing/sliding indentation-dominant process. Tool edge condition was seen to have a significant effect on the resulting forces when the depth of cut was below the tool edge radius. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LUCCA, DA (reprint author), OKLAHOMA STATE UNIV,SCH MECH & AEROSP ENGN,STILLWATER,OK 74078, USA. NR 11 TC 17 Z9 17 U1 0 U2 4 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0569-8197 J9 TRIBOL T JI Tribol. Trans. PD JUL PY 1994 VL 37 IS 3 BP 651 EP 655 DI 10.1080/10402009408983343 PG 5 WC Engineering, Mechanical SC Engineering GA NW434 UT WOS:A1994NW43400031 ER PT J AU AJAYI, OO ERDEMIR, A FENSKE, GR ERCK, RA HSIEH, JH NICHOLS, FA AF AJAYI, OO ERDEMIR, A FENSKE, GR ERCK, RA HSIEH, JH NICHOLS, FA TI EFFECT OF METALLIC-COATING PROPERTIES ON THE TRIBOLOGY OF COATED AND OIL-LUBRICATED CERAMICS SO TRIBOLOGY TRANSACTIONS LA English DT Article DE COATING; SOLID LUBRICANTS; CERAMICS; FRICTION; WEAR ID LIQUID LUBRICATION; BEHAVIOR; FILMS AB Friction and wear behavior was determined for zirconia ceramics lubricated with solid coatings (Ag, Au, and Nb) deposited by ion-beam-assisted-deposition (IBAD) techniques, and a polyol-ester-based synthetic oil. Although the use of soft Ag and Au coatings as solid lubricants in conjunction with the synthetic oil significantly reduced the friction and wear under boundary lubrication at temperatures up to 250-degrees-C, these films had poor durability. In contrast, the Nb coating was more durable in terms of chemical reactivity and adhesion during the tribo-tests than were the Ag or Au films. However, the friction and wear behavior of the Nb-coated zirconia was poorer than that of the ceramics coated with Ag or Au. RP AJAYI, OO (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. NR 10 TC 6 Z9 6 U1 2 U2 3 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0569-8197 J9 TRIBOL T JI Tribol. Trans. PD JUL PY 1994 VL 37 IS 3 BP 656 EP 660 DI 10.1080/10402009408983344 PG 5 WC Engineering, Mechanical SC Engineering GA NW434 UT WOS:A1994NW43400032 ER PT J AU HAN, BG WOLF, SG VONCK, J GLAESER, RM AF HAN, BG WOLF, SG VONCK, J GLAESER, RM TI SPECIMEN FLATNESS OF GLUCOSE-EMBEDDED BIOLOGICAL-MATERIALS FOR ELECTRON CRYSTALLOGRAPHY IS AFFECTED SIGNIFICANTLY BY THE CHOICE OF CARBON EVAPORATION STOCK SO ULTRAMICROSCOPY LA English DT Article ID LIGHT-HARVESTING COMPLEX; RESOLUTION; MICROSCOPY; CRYSTALS; THIN AB Imperfect specimen flatness can be a significant limitation in the application of electron crystallography to high-resolution structure analysis of biological macromolecules. We now report that the choice of solid carbon stock that is used to make evaporated carbon films can have a very great effect on the preparation of flat specimens of glucose-embedded purple membrane. The degree of purity of the carbon does not seem to be the controlling factor, and other likely factors such as the type of mica used as a substrate, the evaporation apparatus used (and its limiting vacuum), and the use of a continuous versus an interrupted evaporation protocol do not have a discernible influence. The physical or chemical basis for the observed differences in specimen flatness is still unknown; however, the important conclusion that we can communicate at this point is that the choice of evaporating material does have a major effect on the flatness of purple membrane, the specimen used here. The implication is that different sources of carbon stock should be tried whenever difficulty is encountered in the preparation of suitably flat specimens of biological macromolecules. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DONNER LAB,DIV LIFE SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,GRAD GRP BIOPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,STANLEY DONNER ASU,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RI Han, Bong-Gyoon/J-9120-2012; WOLF, SHARON/K-1768-2012 OI WOLF, SHARON/0000-0002-5337-5063 FU NCRR NIH HHS [RR05097]; NIGMS NIH HHS [GM 36884] NR 9 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1994 VL 55 IS 1 BP 1 EP 5 DI 10.1016/0304-3991(94)90073-6 PG 5 WC Microscopy SC Microscopy GA PE308 UT WOS:A1994PE30800001 PM 7974847 ER PT J AU HULSE, RA AF HULSE, RA TI THE DISCOVERY OF THE BINARY PULSAR SO USPEKHI FIZICHESKIKH NAUK LA Russian DT Review RP HULSE, RA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08536, USA. NR 4 TC 2 Z9 2 U1 1 U2 1 PU MEZHDUNARODNAYA KNIGA PI MOSCOW PA 39 DIMITROVA UL., 113095 MOSCOW, RUSSIA SN 0042-1294 J9 USP FIZ NAUK+ JI Uspekhi Fiz. Nauk PD JUL PY 1994 VL 164 IS 7 BP 743 EP 756 PG 14 WC Physics, Multidisciplinary SC Physics GA PL844 UT WOS:A1994PL84400004 ER PT J AU DUFF, KC GILCHRIST, PJ SAXENA, AM BRADSHAW, JP AF DUFF, KC GILCHRIST, PJ SAXENA, AM BRADSHAW, JP TI NEUTRON-DIFFRACTION REVEALS THE SITE OF AMANTADINE BLOCKADE IN THE INFLUENZA-A M2 ION-CHANNEL SO VIROLOGY LA English DT Article ID TRANSMEMBRANE DOMAIN; X-RAY; PROTEIN; FORMS; M1 AB The influenza A M2 protein forms proton channels which are blocked by the anti-influenza drug amantadine. Using the technique of neutron diffraction with both deuterium-labeled amantadine and influenza A M2 peptides, this study has directly located the position of interaction between the drug and the transmembrane domain of M2. Amantadine is found 0.5 nm from the center of the bilayer in an area between Val 27 and Ser 31, a location consistent with the formation of a steric block within the ion channel. Similar experiments with amantadine and an amantadine-resistant mutant peptide showed no such interaction. (C) 1994 Academic Press, Inc. C1 UNIV EDINBURGH,SCH MED,DEPT BIOCHEM,EDINBURGH EH8 9XD,MIDLOTHIAN,SCOTLAND. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. UNIV EDINBURGH,DEPT PRECLIN VET SCI,EDINBURGH EH9 1QH,MIDLOTHIAN,SCOTLAND. NR 18 TC 87 Z9 89 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 0042-6822 J9 VIROLOGY JI Virology PD JUL PY 1994 VL 202 IS 1 BP 287 EP 293 DI 10.1006/viro.1994.1345 PG 7 WC Virology SC Virology GA NQ858 UT WOS:A1994NQ85800030 PM 7516598 ER PT J AU PAIK, S NGUYEN, HD CHUNG, JN AF PAIK, S NGUYEN, HD CHUNG, JN TI TRANSIENT CONJUGATED HEAT-TRANSFER ANALYSIS FROM A SPHERE SO WARME UND STOFFUBERTRAGUNG-THERMO AND FLUID DYNAMICS LA English DT Article ID LOW REYNOLDS-NUMBERS; FLOW AB The phenomena of conjugate unsteady heat transfer from a solid spherical particle in a convective environment is numerically investigated for Reynolds numbers in the range from 0.1 to 100. The flow and energy equations for both dispersed and continuous phases are solved using a Chebyshev-Legendre spectral method. This work is an extension of the previous effort of simulating flow around a sphere using spectral method [2] to include heat transfer. General findings indicate that quasi-steady analysis underestimates the overall heat transfer rate significantly at very early time stages, however the extent of underprediction becomes less as time progresses. The underprediction of the quasi-steady assumption becomes larger as Reynolds number increases for a fixed Prandtl number. C1 WASHINGTON STATE UNIV,DEPT MECH & MAT ENGN,PULLMAN,WA 99164. RP PAIK, S (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,MS3880,IDAHO FALLS,ID 83415, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0042-9929 J9 WARME STOFFUBERTRAG PD JUL PY 1994 VL 29 IS 7 BP 431 EP 439 DI 10.1007/BF01584045 PG 9 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA NY182 UT WOS:A1994NY18200005 ER PT J AU HUSTON, MA FONTAINE, TA AF HUSTON, MA FONTAINE, TA TI PREDICTING TEMPORAL AND SPATIAL FLOOD DYNAMICS USING A PRECALIBRATED MODEL SO WATER RESOURCES BULLETIN LA English DT Article DE SURFACE WATER HYDROLOGY; HYDROGRAPH ANALYSIS AND MODELING; FLOODS; SIMULATION; FOREST HYDROLOGY ID 2 FORESTED WATERSHEDS; STORM EVENTS; STREAMFLOW GENERATION; WEST FORK; VARIABILITY; CATCHMENT; TRANSPORT; HILLSLOPE AB A large storm in December 1990 allowed the evaluation of flood predictions from a hydrologic model (TOPMODEL) that had been previously calibrated on the West Fork of Walker Branch Watershed, a gauged 37.5 ha catchment near Oak Ridge, Tennessee. The model predicts both hydrograph dynamics and the spatial distribution of overland flow using an index based on topography. Maximum extent of overland flow during the storm was determined from patterns of leaf litter removal from valley bottoms. Both the flood hydrograph and the extent of overland flow were accurately predicted using model parameters obtained from a three-month period of normal flow conditions during 1983. C1 S DAKOTA SCH MINES & TECHNOL,DEPT CIVIL ENGN,RAPID CITY,SD. RP HUSTON, MA (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Huston, Michael/B-1434-2009 OI Huston, Michael/0000-0001-9513-1166 NR 22 TC 1 Z9 1 U1 0 U2 1 PU AMER WATER RESOURCES ASSOC PI HERNDON PA 950 HERNDON PARKWAY SUITE 300, HERNDON, VA 20170-5531 SN 0043-1370 J9 WATER RESOUR BULL JI Water Resour. Bull. PD JUL-AUG PY 1994 VL 30 IS 4 BP 651 EP 661 PG 11 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA PG099 UT WOS:A1994PG09900010 ER PT J AU SCHEIBE, TD COLE, CR AF SCHEIBE, TD COLE, CR TI NON-GAUSSIAN PARTICLE TRACKING - APPLICATION TO SCALING OF TRANSPORT PROCESSES IN HETEROGENEOUS POROUS-MEDIA SO WATER RESOURCES RESEARCH LA English DT Article ID FICKIAN DISPERSION; GROUNDWATER-FLOW; AQUIFERS; DIFFUSION; SYSTEMS; MODELS AB Observation of scale-dependent dispersion and non-Gaussian concentration distributions under field-scale transport in heterogeneous media motivates investigation of alternatives to the classical Fickian diffusion model. A numerical model of non-Gaussian transport, employing a particle-tracking approach, is examined here. Non-Gaussian behavior is represented through modeling of the correlation between components of the random dispersive vector applied at each time step in the random walk particle-tracking algorithm. This model is applied to a number of highly detailed, synthetic hydraulic conductivity fields. By simultaneously modeling particle movement at two different scales, the impact of the small-scale heterogeneity on the correlation structure of the dispersive vectors at the larger scale can be observed directly. It is shown that accounting for the correlation structure of the dispersive vectors greatly improves prediction of arrival distributions (breakthrough curves) over the standard Fickian model. This improvement is especially evident when the model scale is not much larger than the correlation length of hydraulic conductivity but persists at relatively large transport distances. In particular, the non-Gaussian model is better able to represent the late arrival tail, which has important implications for the design and implementation of aquifer remediation methods. It is also shown that the apparent scale dependence of field dispersivity results at least in part from neglecting the correlation structure of local velocity perturbations. RP SCHEIBE, TD (reprint author), PACIFIC NW LAB, POB 999,BATTELLE BLVD, RICHLAND, WA 99352 USA. RI Scheibe, Timothy/A-8788-2008 OI Scheibe, Timothy/0000-0002-8864-5772 NR 39 TC 23 Z9 23 U1 0 U2 2 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 JUL PY 1994 VL 30 IS 7 BP 2027 EP 2039 DI 10.1029/94WR00587 PG 13 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA NV579 UT WOS:A1994NV57900007 ER PT J AU SUBIA, SR INGBER, MS MARTINEZ, MJ AF SUBIA, SR INGBER, MS MARTINEZ, MJ TI A 3-DIMENSIONAL BOUNDARY-ELEMENT METHOD FOR STEADY UNSATURATED QUASI-LINEAR FLOW IN POROUS-MEDIA SO WATER RESOURCES RESEARCH LA English DT Article ID HYDRAULIC CONDUCTIVITY; CYLINDRICAL CAVITIES; EXCLUSION PROBLEM; INFILTRATION; SEEPAGE AB A three-dimension boundary element method is developed to study unsaturated groundwater flows in heterogeneous porous media. The method is based on the Kirchhoff transformation of variables which transforms the nonlinear Richards equation into the Fokker-Planck equation. Several benchmark problems are considered involving cavity infiltration and exclusion to demonstrate the reliability of the boundary element formulation. As an example application problem, the effective conductivity of a porous medium containing randomly positioned impermeable spherical inclusions is considered. C1 SANDIA NATL LABS,DEPT COMP FLUID DYNAM,ALBUQUERQUE,NM 87185. RP SUBIA, SR (reprint author), UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131, USA. NR 22 TC 2 Z9 2 U1 0 U2 0 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 JUL PY 1994 VL 30 IS 7 BP 2097 EP 2104 DI 10.1029/94WR00753 PG 8 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA NV579 UT WOS:A1994NV57900012 ER PT J AU VIANCO, PT HOSKING, FM REJENT, JA AF VIANCO, PT HOSKING, FM REJENT, JA TI WETTABILITY OF METALLIC-GLASS ALLOYS BY 2 TIN-BASED SOLDERS SO WELDING JOURNAL LA English DT Article DE SOLDERING; TIN-BASED SOLDERS; WETTABILITY; METALLIC GLASS ALLOY; STRUCTURAL RELAXATION; ORGANIC ACID FLUX; INORGANIC ACID FLUX; CONTACT ANGLE; MORPHOLOGY; SURFACE CLEANING ID EMBRITTLEMENT AB The wettability of 95Sn-5Sb (wt-%) and 96.5Sn-3.5Ag solder alloys on rapidly solidified metal ribbons of compositions: 92Fe-3B-5Si, 81Co-4Fe-1Ni-4Mo-3B-7Si, and 82Co-5Fe-1Ni-3B-9Si was analyzed by the meniscometer/wetting balance technique. Two organic acid fluxes and an inorganic acid flux were evaluated. The substrate surfaces received only a solvent degreasing treatment. The 96.5Sn-3.5Ag and 95Sn-5Sb solders exhibited fair to good wetting with contact angles of 32 to 62 deg and 25 to 60 deg, respectively. The contact angle values were similar with the two organic acid fluxes and slightly lower with the inorganic acid solution. Although the surface morphology was different on the two faces of the ribbons, the contact angles of either surface for each ribbon were similar. The quality of the solder film remaining on the samples was largely dependent upon the particular solder-flux-substrate system with the exception of the inorganic flux for which dewetting was always observed. The solder-flux interfacial tension values depended upon the flux and solder alloy. Thermal annealing of the metallic glass caused a deterioration in wettability. Undetected changes to the thickness of the native surface oxide layer, or the thermally relaxed structure resulting from the heat treatment, were likely sources of the increased contact angle. RP VIANCO, PT (reprint author), SANDIA NATL LABS,CTR SOLDER SCI & TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 12 TC 0 Z9 0 U1 1 U2 4 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUL PY 1994 VL 73 IS 7 BP S153 EP S163 PG 11 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA NV744 UT WOS:A1994NV74400012 ER PT J AU ZACHARIA, T AF ZACHARIA, T TI DYNAMIC STRESSES IN WELD METAL HOT CRACKING SO WELDING JOURNAL LA English DT Article DE WELD METAL; HOT CRACKING; DYNAMIC STRESSES; MECHANICAL LOADING; THERMAL STRESS; EXTERNAL RESTRAINT; TYPE-316-SS; SIGMAJIG SPECIMEN; METALLURGY; MECHANICAL FACTORS ID IRON ALUMINIDES; SOLIDIFICATION; WELDABILITY; MODEL AB This paper presents the results of a study aimed at understanding the influence of dynamic stresses, induced by thermal and mechanical loading, on weld metal hot cracking. The study attempts to resolve the relationship between the dynamic stress distribution in the specimen, particularly near the trailing edge of the pool, and the observed cracking behavior in a Sigmajig test specimen. The transient stress distribution in the specimen resulting from mechanical and thermal loading was calculated for a Type 316 stainless steel specimen. The initiation and propagation of the crack during welding was visually monitored using a stroboscopic vision system. The numerical results were used to understand the initiation and propagation of weld metal hot cracks during controlled welding of a specimen subjected to external restraint. The results of this study indicate that for hot cracking to occur, there exists a dynamic relationship between the metallurgical and mechanical factors, which can be influenced by the welding conditions and mechanical restraint. RP ZACHARIA, T (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,MAT PROC MODELING GRP,OAK RIDGE,TN 37831, USA. NR 30 TC 17 Z9 17 U1 0 U2 0 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUL PY 1994 VL 73 IS 7 BP S164 EP S172 PG 9 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA NV744 UT WOS:A1994NV74400013 ER PT J AU GIAUQUE, RD AF GIAUQUE, RD TI A NOVEL METHOD TO ASCERTAIN SAMPLE MASS THICKNESS AND MATRIX EFFECTS FOR X-RAY-FLUORESCENCE ELEMENT DETERMINATIONS SO X-RAY SPECTROMETRY LA English DT Article ID RADIATION AB An x-ray fluorescence method was developed for the determination of both trace and major elements in environmental mental samples that are primarily of geochemical origin. For analysis, unweighed finely pulverized sample material is lightly compressed to a mass thickness between 0.1 and 0.4 g cm-2. The method utilizes the relative intensities of two incoherent and one coherent scattered excitation radiation to ascertain the sample mass thickness and the photoelectric cross-section of the sample for the excitation radiation. This information is employed to calculate matrix absorption and enhancement effect corrections required for the individual element determinations. The intensity of one of the incoherently scattered radiations serves as an internal standard for all of the element determinations. The capability of the method has been demonstrated with three US National Institute of Standards and Technology reference materials. The concentrations of sixteen trace elements (Mn, Ni, Cu, Zn, Ga, As, Se, Br, Rh, Sr, Y, Zr, Nb, Ba, Pb, and Th) and four major elements (K, Ca, Ti, and Fe) were determined from one x-ray spectrum which was acquired over a 1000 s counting interval. RP GIAUQUE, RD (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 14 TC 23 Z9 23 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0049-8246 J9 X-RAY SPECTROM JI X-Ray Spectrom. PD JUL-AUG PY 1994 VL 23 IS 4 BP 160 EP 168 DI 10.1002/xrs.1300230405 PG 9 WC Spectroscopy SC Spectroscopy GA NZ938 UT WOS:A1994NZ93800004 ER PT J AU SEIFERT, HL WOUTERS, JM VIEIRA, DJ WOLLNIK, H ZHOU, XG TU, XL ZHOU, ZY BUTLER, GW AF SEIFERT, HL WOUTERS, JM VIEIRA, DJ WOLLNIK, H ZHOU, XG TU, XL ZHOU, ZY BUTLER, GW TI MASS MEASUREMENT OF NEUTRON-RICH ISOTOPES FROM CA-51 TO NI-72 SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Article ID DECAY HALF-LIVES; BETA-DECAY; TOFI SPECTROMETER; NICKEL ISOTOPES; NUCLEI; NI-68; PREDICTIONS; CHLORINE; CHROMIUM; FORMULA AB The ground state masses of thirty-nine neutron-rich nuclei from 51Ca to 72Ni have been measured using the Time-of-Flight Isochronous (TOFI) spectrometer. Eight of these masses have been measured for the first time and thirty-one are remeasurements of neutron-rich nuclei previously reported. Good agreement between these results and a previous TOFI experiment was observed except for the most neutron-rich isotopes of vanadium through iron with the present results being more bound and in better agreement with theory. The low binding energy of 68Ni, as indicated by an unreasonably low two-neutron separation energy, suggests the presence of a high-lying, long-lived isomeric state in this nucleus. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UTAH STATE UNIV,LOGAN,UT 84322. RP SEIFERT, HL (reprint author), JUSTUS LIEBIG UNIV,INST PHYS 2,D-35392 GIESSEN,GERMANY. NR 44 TC 42 Z9 43 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-7922 J9 Z PHYS A-HADRON NUCL JI Z. Phys. A.-Hadrons Nuclei PD JUL PY 1994 VL 349 IS 1 BP 25 EP 32 DI 10.1007/BF01296329 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PA338 UT WOS:A1994PA33800007 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML 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 BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M 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 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 BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, 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 DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M 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 GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P 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 LINDNER, R LIPNIACKA, A 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 MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A NOVAK, M OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P 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 SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ 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, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV 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TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ 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, B 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 WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI A PRECISION-MEASUREMENT OF THE AVERAGE LIFETIME OF B HADRONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article AB The average lifetime of B hadrons was measured using data collected with the DELPHI detector at the LEP collider during 1991 and 1992. The measurement was performed using two different analyses. The first method was an improvement on a previous technique, which used charged particle impact parameter distributions. This analysis measured an average lifetime for B hadrons of tau(B) = 1.542 +/- 0.021 (stat.) +/- 0.045 (syst.) ps. (1) The second method was based on a new technique, which used inclusively reconstructed secondary vertices to measure tau(B) = 1.599 +/- 0.014 (stat.) +/- 0.035 (syst.) ps. (2) Taking into account both the statistical and systematic correlations, the results of these two methods were combined to give an average lifetime for B hadrons of tau(B) = 1.582 +/- 0.012 (stat.) +/- 0.032 (syst.) ps. (3) C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,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,CTR RECH NUCL,IN2P3,CNRS,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,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 GRENOBLE,FRANCE. UNIV HELSINKI,SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT NUCL RES INST,101000 MOSCOW,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,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. FCUL,IST,LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22362 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,NC,CS-18000 PRAGUE 8,CZECH REPUBLIC. 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. CTR ETUD SACLAY,DSM DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,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,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 FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. 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; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Verlato, Marco/J-4604-2012; Nomerotski, Andrei/A-5169-2010; Dracos, Marcos/K-2335-2012; 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; Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; 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; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; 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; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; PREST, MICHELA/0000-0003-3161-4454; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 14 TC 14 Z9 14 U1 0 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUL PY 1994 VL 63 IS 1 BP 3 EP 15 PG 13 WC Physics, Particles & Fields SC Physics GA NZ267 UT WOS:A1994NZ26700001 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML 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 BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M 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 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 BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J 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 DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M 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 GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M 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 KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A 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 MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB IRESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACCQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SEIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ 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, B 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 WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML 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 BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M 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 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 BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J 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 DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M 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 GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M 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 KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A 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 MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB IRESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACCQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SEIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ 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, B 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 WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI INVARIANT MASS DEPENDENCE OF PARTICLE CORRELATIONS IN HADRONIC FINAL-STATES FROM THE DECAY OF THE Z0 SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID BOSE-EINSTEIN CORRELATIONS; LUND MONTE-CARLO; JET FRAGMENTATION; K+P INTERACTIONS; HIGH-ENERGY; 250 GEV/C; INTERMITTENCY; Z(0); DISTRIBUTIONS; FLUCTUATIONS AB Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign pions. Strong correlations are observed only at small masses. The correlations decrease very rapidly for like-sign pions and slowly for unlike-sign pions, manifesting different particle dynamics. The like-sign correlations exhibit a power-law behaviour as a function of mass, compatible with the previously observed intermittency effect. The predictions of the parton shower model (JETSET 7.3) deviate significantly from the data. However, good agreement is obtained with the mass correlations, both for the unlike-sign and for the like-sign pairs if the production of the eta' and rho0 mesons is reduced and Bose-Einstein correlations are included in the model. The value of the Bose-Einstein correlation strength is consistent with unity for pions which are produced directly or in the decays of short-lived resonances. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. ULB,VUB,IIHB,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,CTR RECH NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,FZU,INST PHYS,DIV HIGH ENERGY PHYS,CS-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 GRENOBLE,FRANCE. UNIV HELSINKI,SEPT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT NUCL RES INST,101000 MOSCOW,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. INST 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. FCUL,IST,LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-25252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22362 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,NC,CS-18000 PRAGUE 8,CZECH REPUBLIC. NIFHEFH,1009 PB AMSTERDAM,NETHERLANDS. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. 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. CTR ETUD SACLAY,DSM DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,ITALY. J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,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 FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Andreazza, Attilio/E-5642-2011; 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; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; 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; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; OI Andreazza, Attilio/0000-0001-5161-5759; 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; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; Demaria, Natale/0000-0003-0743-9465; DE MIN, ALBERTO/0000-0002-8130-9389; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599; Smirnova, Oxana/0000-0003-2517-531X NR 39 TC 55 Z9 55 U1 0 U2 9 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUL PY 1994 VL 63 IS 1 BP 17 EP 28 PG 12 WC Physics, Particles & Fields SC Physics GA NZ267 UT WOS:A1994NZ26700002 ER PT J AU BURROWS, PN MASUDA, H AF BURROWS, PN MASUDA, H TI ON THE APPLICABILITY OF FINITE-ORDER PERTURBATIVE QCD CALCULATIONS OF JET RATES IN E+E- ANNIHILATION SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HADRONIC-Z-DECAYS; ALPHA-S; CROSS-SECTIONS; QUANTUM CHROMODYNAMICS; LEADING ORDER; RESONANCE; LEP AB We have studied the measurement of alpha(s) using exact second order QCD matrix element calculations of jet rates in e+e- ---> hadrons. We investigate the dependence of alpha(s)(M(Z)2), measured by experiments at the Z0 resonance, on the choice of renormalisation scale in terms of the functional form of the three-jet matrix element. We find that only a restricted domain of the jet resolution parameter y(c), LAMBDA(MS)BAR, and scale gives a perturbation series which is well-behaved to second order, and that this domain is different for the various jet algorithms in current use. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP BURROWS, PN (reprint author), MIT,NUCL SCI LAB,CAMBRIDGE,MA 02139, USA. NR 42 TC 7 Z9 7 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUL PY 1994 VL 63 IS 2 BP 235 EP 240 DI 10.1007/BF01411015 PG 6 WC Physics, Particles & Fields SC Physics GA PD511 UT WOS:A1994PD51100006 ER PT J AU WANG, JY WANG, J LU, JM OLSEN, K AF WANG, JY WANG, J LU, JM OLSEN, K TI ADSORPTIVE STRIPPING VOLTAMMETRY OF TRACE URANIUM - CRITICAL COMPARISON OF VARIOUS CHELATING-AGENTS SO ANALYTICA CHIMICA ACTA LA English DT Article DE ADSORPTIVE STRIPPING VOLTAMMETRY; PROPYL GALLATE; N-BENZOYL-N-PHENYLHYDROXYLAMINE; URANIUM AB A critical and systematic evaluation of four chelating agents for adsorptive stripping voltammetric measurements of trace uranium is reported. The utility of propyl gallate (PG) and N-benzoyl-N-phenylhydroxylamine (BPA) is illustrated for the first time and compared to that of previously used cupferron and oxine. All ligands offer convenient quantitation of low mu g/l uranium concentrations, following short adsorption times. The sensitivity pattern is: PG > cupferron > oxine > BPA. A large difference in the selectivity (in the presence of co-existing metals) is observed, according to the following selectivity order: PG approximate to cupferron > BPA > oxine. Applicability to rapid assays of groundwater and sediments is illustrated. Such comparison of the analytical performance of various ligands should serve as a guide for selecting the most appropriate adsorptive stripping scheme for other target metals. C1 NEW MEXICO STATE UNIV, DEPT CHEM & BIOCHEM, LAS CRUCES, NM 88003 USA. PACIFIC NW LAB, DEPT ENVIRONM SCI, GEOCHEM SECT, RICHLAND, WA 99352 USA. RI Wang, Joseph/C-6175-2011 NR 6 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD JUN 30 PY 1994 VL 292 IS 1-2 BP 91 EP 97 DI 10.1016/0003-2670(94)00067-0 PG 7 WC Chemistry, Analytical SC Chemistry GA NV042 UT WOS:A1994NV04200012 ER PT J AU BAYNE, C DONOHUE, D FIEDLER, R AF BAYNE, C DONOHUE, D FIEDLER, R TI MULTIDETECTOR CALIBRATION FOR MASS SPECTROMETERS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE MULTIDETECTOR CALIBRATION; PEAK-JUMP EXPERIMENTS; PEAK-SHIFT EXPERIMENTS; DETECTOR EFFICIENCY FACTORS AB The international Atomic Energy Agency's Safeguards Analytical Laboratory has performed calibration experiments to measure the different efficiencies among, multi-Faraday detectors for a Finnigan-MAT 261 mass spectrometer. Two types of calibration experiments were performed: (i) peak-shift experiments and (ii) peak-jump experiments. For peak-shift experiments, the ion intensities were measured for all isotopes of an element in different Faraday detectors. Repeated measurements were made by shifting the isotopes to various Faraday detectors. Two different peak-shifting schemes were used to measure plutonium (UK Pu5/92138) samples. For peak-jump experiments, ion intensities were measured in a reference Faraday detector for a single isotope and compared with those measured in the other Faraday detectors. Repeated measurements were made by switching back-and-forth between the reference Faraday detector and a selected Faraday detector. This switching procedure is repeated for all Faraday detectors. Peak-jump experiments were performed with replicate measurements of Pu-239, Re-187, and U-238. Detector efficiency factors were estimated for both peak-jump and peak-shift experiments using a flexible calibration model to statistically analyze both types of multidetector calibration experiments. Calculated detector efficiency factors were shown to depend on both the material analyzed and the experimental conditions. C1 IAEA,SAFEGUARDS ANALYT LAB,SEIBERSDORF,AUSTRIA. RP BAYNE, C (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 6 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD JUN 30 PY 1994 VL 134 IS 2-3 BP 169 EP 182 DI 10.1016/0168-1176(94)03993-3 PG 14 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA PE109 UT WOS:A1994PE10900008 ER PT J AU TAYLOR, KE PENNER, JE AF TAYLOR, KE PENNER, JE TI RESPONSE OF THE CLIMATE SYSTEM TO ATMOSPHERIC AEROSOLS AND GREENHOUSE GASES SO NATURE LA English DT Article ID CLOUD ALBEDO; POLLUTION; TRANSPORT; IMPACT; MODEL AB RECENTLY, Kiehl and Briegleb(1) evaluated the radiative forcing associated with the capacity of atmospheric sulphate aerosols to reflect solar radiation back into space, and compared this with the forcing associated with atmospheric greenhouse gases. They found that the (negative) climate forcing by the aerosols has strong regional character, with the greatest forcing over Northern Hemisphere land surfaces, whereas the (positive) forcing by greenhouse gases is distributed almost equally between the hemispheres and varies mainly as a function of latitude. Here we present simulations of the response of the climate system to these two types of forcing. We find that the global response to aerosol forcing is regionally heterogeneous, with a distribution that is different from the forcing pattern. The simulations also imply that, for equal magnitudes of forcing, the temperature response is markedly greater for carbon dioxide than for aerosol forcing. We conclude that to predict the global mean climate response to global mean forcing, it is necessary to separate out the different components of the forcing to which the climate system is sensitive. C1 LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,LIVERMORE,CA 94551. RI Taylor, Karl/F-7290-2011; Penner, Joyce/J-1719-2012 OI Taylor, Karl/0000-0002-6491-2135; NR 25 TC 237 Z9 244 U1 3 U2 17 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 30 PY 1994 VL 369 IS 6483 BP 734 EP 737 DI 10.1038/369734a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NU581 UT WOS:A1994NU58100056 ER PT J AU SAMUEL, MA LI, G AF SAMUEL, MA LI, G TI ESTIMATING PERTURBATIVE COEFFICIENTS IN QUANTUM-FIELD THEORY AND THE ORTHO-POSITRONIUM DECAY-RATE DISCREPANCY SO PHYSICS LETTERS B LA English DT Article ID PRECISION-MEASUREMENT; QCD AB A method to estimate perturbative coefficients in high energy physics, condensed matter theory and statistical physics is presented. It is shown to be accurate for a wide class of expansions. It is then applied to the ortho-positronium decay rate, where a discrepancy between theory and experiment has persisted for seven years. This difference is reduced to less than 2sigma. In the case of para-positronium, the agreement between theory and experiment persists. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP SAMUEL, MA (reprint author), OKLAHOMA STATE UNIV,DEPT PHYS,STILLWATER,OK 74078, USA. NR 17 TC 26 Z9 26 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 JUN 30 PY 1994 VL 331 IS 1-2 BP 114 EP 118 DI 10.1016/0370-2693(94)90950-4 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NX258 UT WOS:A1994NX25800017 ER PT J AU AOKI, S BOETTCHER, S GOCKSCH, A AF AOKI, S BOETTCHER, S GOCKSCH, A TI SPONTANEOUS BREAKING OF FLAVOR SYMMETRY AND PARITY IN THE NAMBU JONA-LASINIO MODEL WITH WILSON FERMIONS SO PHYSICS LETTERS B LA English DT Article ID LATTICE QCD; U(1) PROBLEM; PHASE AB We study the lattice Nambu-Jona-Lasinio model with two flavors of Wilson fermions in the large N limit, where N is the number of ''colors''. For large values of the four-fermion coupling we find a phase in which both, flavor symmetry and parity, are spontaneously broken. In accordance with general expectations there are three massless pions on the phase boundary, but only two of them remain massless inside the broken phase. This is analogous to earlier results obtained in lattice QCD, indicating that this behavior is a very general feature of the Wilson term. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP AOKI, S (reprint author), UNIV TSUKUBA,INST PHYS,TSUKUBA,IBARAKI 305,JAPAN. RI Boettcher, Stefan/G-2640-2010 OI Boettcher, Stefan/0000-0003-1273-6771 NR 19 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 30 PY 1994 VL 331 IS 1-2 BP 157 EP 164 DI 10.1016/0370-2693(94)90957-1 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NX258 UT WOS:A1994NX25800024 ER PT J AU FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S VITTONE, M BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L 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 BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY AF FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S VITTONE, M BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L 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 BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI ANALYSIS OF 3 D-]K-PI-PI DALITZ PLOTS SO PHYSICS LETTERS B LA English DT Article ID D-MESONS; RESONANT SUBSTRUCTURE; DECAYS AB Analysis of three D --> Kpipi Dalitz plots is presented using data collected by the Fermilab high energy photoproduction experiment E687. Our data are fit to a model consisting of a sum of Breit-Wigner amplitudes for the intermediate two-body resonant decay modes and a constant term for the nonresonant contribution. We extract branching fractions and relative phases and compare them to the results obtained in other experiments. Although this model qualitatively reproduces many features of our data, statistically significant discrepancies are observed in some of our fits. C1 INFN,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. INFN MILANO,I-20133 MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. NORTHWESTERN UNIV,EVANSTON,IL 60208. INFN PAVIA,I-27100 PAVIA,ITALY. UNIV N CAROLINA ASHEVILLE,ASHEVILLE,NC 28804. UNIV NOTRE DAME,NOTRE DAME,IN 46556. DIPARTIMENTO FIS TEORICA & NUCL,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV S CAROLINA,COLUMBIA,SC 29208. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV TENNESSEE,KNOXVILLE,TN 37996. KOREA UNIV,SEOUL,SOUTH KOREA. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 13 TC 77 Z9 77 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 JUN 30 PY 1994 VL 331 IS 1-2 BP 217 EP 226 DI 10.1016/0370-2693(94)90966-0 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NX258 UT WOS:A1994NX25800033 ER PT J AU ANDREWS, MA VOSS, EJ GOULD, GL KLOOSTER, WT KOETZLE, TF AF ANDREWS, MA VOSS, EJ GOULD, GL KLOOSTER, WT KOETZLE, TF TI REGIOSELECTIVE COMPLEXATION OF UNPROTECTED CARBOHYDRATES BY PLATINUM(II) - SYNTHESIS, STRUCTURE, COMPLEXATION EQUILIBRIA, AND HYDROGEN-BONDING IN CARBONATE-DERIVED BIS(PHOSPHINE)PLATINUM(II) DIOLATE AND ALDITOLATE COMPLEXES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; MAIN-GROUP ELEMENTS; TRANSITION-METALS; COUPLING-CONSTANTS; MULTIPLE BONDS; COORDINATION; DERIVATIVES; ELIMINATION; GLYCOSIDES; SUGARS AB Treatment of bis(phosphine)platinum(II) carbonate complexes (LL)Pt(CO3) (e.g., LL = 1,3-bis(diphenylphosphino)propane) with vicinal diols (i.e., HOCR(1)R(2)CR(3)R(4)OH) gives equilibrium conversion to the corresponding diolate complexes (LL)Pt(OCR(1)R(2)CR(3)R(4)O), which are readily isolated in good yield. From competition experiments, relative diol complexation constants were determined as a function of both the diol and the phosphine substituents and found to span a range of over 10(4). Corresponding triolate and alditolate complexes were similarly prepared, for which very distinct equilibrium isomeric regioselectivities are observed, favoring complexation of gamma,delta-threo diols. An X-ray structure of (dppp)Pt(D-mannitolate) shows that the mannitol is bonded to the platinum as its dianion via the oxygens on C3 and C4 to form a 2,5-dioxaplatinacyclopentane chelate ring and that three different strong intramolecular hydrogen-bonding interactions are present between the hydroxyl hydrogens and the metallacycle oxygens (O...O (av) = 2,65(2) A), forming five-, six-, and seven-membered rings. Crystal data for PtP2O6C33H38.CH2Cl2: P2(1)2(1)2(1), Z = 4, T approximate to 20 degrees C, a = 11.225(2) Angstrom, b = 15.875(3) Angstrom, c 19.964(4) Angstrom, R(F-o) = 0.058, R(w)(F-o) = 0.062. RP ANDREWS, MA (reprint author), BROOKHAVEN NATL LAB, DEPT CHEM, POB 5000, UPTON, NY 11973 USA. NR 71 TC 41 Z9 41 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 29 PY 1994 VL 116 IS 13 BP 5730 EP 5740 DI 10.1021/ja00092a025 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA NV421 UT WOS:A1994NV42100025 ER PT J AU HINES, JV LANDRY, SM VARANI, G TINOCO, I AF HINES, JV LANDRY, SM VARANI, G TINOCO, I TI CARBON-PROTON SCALAR COUPLINGS IN RNA - 3D HETERONUCLEAR AND 2D ISOTOPE-EDITED NMR OF A C-13-LABELED EXTRA-STABLE HAIRPIN SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID 3-DIMENSIONAL NMR; CONFORMATIONAL-ANALYSIS; BOND CONFORMATIONS; CONSTANTS; SPECTROSCOPY; C-13; ACID; URIDINE; SPECTRA; DNA AB Long range carbon-proton scalar couplings were measured for an RNA hairpin of 12 nucleotides using 3D and C-13-edited 2D NMR. The large one-bond carbon-proton scalar couplings ((1)J(CH)) and small n-bond couplings ((n)J(CH)) produce ECOSY type cross-peaks, thus facilitating the determination of the sign and magnitude of the smaller (2)J(CH) or (3)J(CH). The UUCG RNA hairpin (5'-rGGACUUCGGUCC-3'), whose structure has been determined by our laboratory, was uniformly C-13-labeled at 30% isotopic enrichment. The observed (n)J(CH) couplings were then correlated to the known structure. The signs of (2)J(C4'H5'), (2)J(C4'H5'), and (2)J(C5'H4') can be used for the stereospecific assignment of H5'/(pro-S)/H5'' (pro-R) protons and for determining torsion angle gamma(O5'-C5'-C4'-C3'). The sign of any one of the (2)J(C1'H2'), (2)J(C2'H3'), (2)J(C3'H2') and (2)J(C4'H3)' can be used to determine the ribose sugar conformation. Comparison of the magnitude of (3)J(C3'H5') and (3)J(C3'H5'') can also be used for the stereospecific assignment of H-5'(pro-S)/H-5''(pro-R). The utility and potential limitations of using (n)J(CH) for RNA structure determination are discussed in-depth. This new information which correlates signs and magnitudes of (n)J(CH) both to double-stranded A-form and nonhelix RNA structure forms a basis from which strategies for the structure determination of larger RNA and RNA-protein complexes can be derived. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. NR 56 TC 68 Z9 68 U1 0 U2 6 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 JUN 29 PY 1994 VL 116 IS 13 BP 5823 EP 5831 DI 10.1021/ja00092a037 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA NV421 UT WOS:A1994NV42100037 ER PT J AU GALE, DC GOODLETT, DR LIGHTWAHL, KJ SMITH, RD AF GALE, DC GOODLETT, DR LIGHTWAHL, KJ SMITH, RD TI OBSERVATION OF DUPLEX DNA-DRUG NONCOVALENT COMPLEXES BY ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CAPILLARY ZONE ELECTROPHORESIS; SEQUENCE-SPECIFIC RECOGNITION; DIEN-MICROGONOTROPEN-A; MINOR-GROOVE BINDING; STRUCTURAL CHARACTERIZATION; TRIPYRROLE PEPTIDES; DISTAMYCIN; CONFORMATION; NMR; DESIGN 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 49 TC 107 Z9 109 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 JUN 29 PY 1994 VL 116 IS 13 BP 6027 EP 6028 DI 10.1021/ja00092a087 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NV421 UT WOS:A1994NV42100087 ER PT J AU SELVIN, PR RANA, TM HEARST, JE AF SELVIN, PR RANA, TM HEARST, JE TI LUMINESCENCE RESONANCE ENERGY-TRANSFER SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID TERBIUM(III); IMMUNOASSAYS; PROBES C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 16 TC 161 Z9 162 U1 3 U2 21 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 JUN 29 PY 1994 VL 116 IS 13 BP 6029 EP 6030 DI 10.1021/ja00092a088 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NV421 UT WOS:A1994NV42100088 ER PT J AU GUAN, Y ZHANG, H KONINGS, RNH HILBERS, CW TERWILLIGER, TC WANG, AHJ AF GUAN, Y ZHANG, H KONINGS, RNH HILBERS, CW TERWILLIGER, TC WANG, AHJ TI CRYSTAL-STRUCTURES OF Y41H AND Y41F MUTANTS OF GENE V-PROTEIN FROM FF PHAGE SUGGEST POSSIBLE PROTEIN-PROTEIN INTERACTIONS IN THE GVP-SSDNA COMPLEX SO BIOCHEMISTRY LA English DT Article ID SINGLE-STRANDED-DNA; FILAMENTOUS BACTERIOPHAGE-IKE; SPIN-LABELED OLIGONUCLEOTIDE; NUCLEAR MAGNETIC-RESONANCE; BINDING-PROTEIN; ESCHERICHIA-COLI; 3-DIMENSIONAL STRUCTURE; ACID-BINDING; II PROTEIN; 5 PROTEIN AB Gene V protein (GVP) encoded by the filamentous phage Ff (M13, fl, fd) is a homodimeric protein of 87 amino acids that binds to single-stranded DNA (ssDNA) nonspecifically and cooperatively. The structure (monoclinic C2 form) of the wild-type protein has been determined and refined at 1.8-Angstrom resolution [Skinner et al. (1994) Proc. Natl. Acad. Sci. U.S.A. 91, 2071-2075]. The monomer structure consists of a somewhat distorted five-stranded beta-barrel core with three prominent loops: a DNA-binding loop, a dyad loop, and a dimer contact loop. The amino acid residue at position 41 plays an important role in the dimer-dimer interactions of the protein-ssDNA complex. Two Y41 mutant structures have been studied by X-ray crystallography. The Y41F GVP structure has been refined to an R-factor of 0.180 at 2.2-Angstrom resolution and is very similar to the wild-type (wt) structure (rmsd of all C-alpha atoms = 0.30 Angstrom). In contrast, Y41H GVP forms a new crystal lattice in the space group P2(1)2(1)2(1) with a = 77.18 Angstrom, b = 84.17 Angstrom, and c = 28.62 Angstrom. Its structure has been solved by the molecular replacement method and refined to an R-factor of 0.170 at 2.5-Angstrom resolution. The two monomers of Y41H are crystallographically independent, and their structures remain similar to wt-GVP but with significant differences, particularly in the DNA-binding hairpin region. In both crystals, the loop (residues 36-43) that contains the Y41 residue is involved in the crystal dimer packings but in a different manner. The dimer-dimer contacts found in the wt-GVP crystal may be important for GVP aggregation in the absence of DNA. In the presence of DNA, the dimer-dimer contacts may switch to the type found in the Y41H crystal, allowing the GVP-ssDNA complex to form cooperatively. A model of the complex, consistent with existing biochemical and biophysical data, has been constructed from those crystal packing data. C1 UNIV ILLINOIS, DIV BIOPHYS, URBANA, IL 61801 USA. UNIV ILLINOIS, DEPT CELL & STRUCT BIOL, URBANA, IL 61801 USA. UNIV NIJMEGEN, BIOPHYS CHEM LAB, NIJMEGEN, NETHERLANDS. UNIV NIJMEGEN, MOLEC BIOL LAB, NIJMEGEN, NETHERLANDS. LOS ALAMOS NATL LAB, DIV LIFE SCI, LOS ALAMOS, NM 87545 USA. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 FU NCI NIH HHS [CA-52054]; NIGMS NIH HHS [GM-41612] NR 49 TC 26 Z9 27 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD JUN 28 PY 1994 VL 33 IS 25 BP 7768 EP 7778 DI 10.1021/bi00191a004 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NU491 UT WOS:A1994NU49100004 PM 8011642 ER PT J AU DOLMATOV, VK AMUSIA, MY AF DOLMATOV, VK AMUSIA, MY TI RESONANT STRUCTURE OF THE 3D ELECTRONS ANGULAR-DISTRIBUTION IN A FREE MN+ ION SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter ID 3P PHOTOABSORPTION; ATOMS; CR AB The 3d-electrons angular anisotropy parameter of the free Mn+ ion is calculated using the 'spin-polarized' random phase approximation with exchange. Strong resonance structure is discovered, which is due to interference with powerful 3p --> 3d discrete excitation. The effect of the 3p --> 4s transition is also noticeable. The ordering of these respective resonances with phonon energy increase proved to be opposite in angular anisotropy parameter to that in 3d photoionization cross section. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. SV STARODUBTSEV PHYS TECH INST,700084 TASHKENT,UZBEKISTAN. AF IOFFE PHYS TECH INST,194021 ST PETERSBURG,RUSSIA. RP DOLMATOV, VK (reprint author), UNIV HAMBURG,INST EXPTL PHYS 2,D-22761 HAMBURG,GERMANY. RI Amusia, Miron/K-7726-2014; OI Dolmatov, Valeriy/0000-0001-9040-9990 NR 10 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 JUN 28 PY 1994 VL 27 IS 12 BP L281 EP L285 DI 10.1088/0953-4075/27/12/002 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NV917 UT WOS:A1994NV91700002 ER PT J AU YEH, CY ZHANG, SB ZUNGER, A AF YEH, CY ZHANG, SB ZUNGER, A TI PRESSURE-DEPENDENCE OF THE BAND-GAPS IN SI QUANTUM WIRES SO APPLIED PHYSICS LETTERS LA English DT Article ID POROUS SILICON; HYDROSTATIC-PRESSURE; OPTICAL-PROPERTIES; 1ST-PRINCIPLES AB The pressure coefficients a of interband transitions in (001) silicon wires are calculated using a plane-wave basis and carefully fitted empirical pseudopotentials. We find purely red shifts (a < 0). Their magnitudes, as well as changes with wire sizes can be interpreted in terms of the ''truncated crystal model'' which describes the wire conduction bands as linear combination of the lowest bulk conduction bands along the GAMMA-X line. RP YEH, CY (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 20 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 27 PY 1994 VL 64 IS 26 BP 3545 EP 3547 DI 10.1063/1.111219 PG 3 WC Physics, Applied SC Physics GA NU155 UT WOS:A1994NU15500007 ER PT J AU NELSON, AJ HORNER, GS SINHA, K BODE, MH AF NELSON, AJ HORNER, GS SINHA, K BODE, MH TI ORDERED VACANCY COMPOUND CUIN3SE5 ON GAAS (100) - EPITAXIAL-GROWTH AND CHARACTERIZATION SO APPLIED PHYSICS LETTERS LA English DT Article ID CDS/CUINSE2 HETEROJUNCTION; CUINSE2 AB Epitaxial growth of the ordered vacancy compound CuIn3Se5 has been achieved on GaAs (100) by molecular beam epitaxy from Cu2Se and In2Se3 sources. Electron probe microanalysis and x-ray diffraction have confirmed the composition for the 1-3-5 phase and that the films are single-crystal CuIn3Se5 (100). Transmission electron microscopy characterization of the material also showed it to be single crystalline. Structural defects in the layer consisted mainly of stacking faults. Photoluminescence measurements performed at 7.5 K indicate that the band gap is 1.28 eV Raman spectra reveal a strong polarized peak at 152 cm-1, which is believed to arise from the totally symmetric vibration of the Se atoms in the lattice. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 18 TC 56 Z9 56 U1 1 U2 7 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 JUN 27 PY 1994 VL 64 IS 26 BP 3600 EP 3601 DI 10.1063/1.111211 PG 2 WC Physics, Applied SC Physics GA NU155 UT WOS:A1994NU15500026 ER PT J AU CHISHOLM, MF BROWNING, ND PENNYCOOK, SJ JEBASINSKI, R MANTL, S AF CHISHOLM, MF BROWNING, ND PENNYCOOK, SJ JEBASINSKI, R MANTL, S TI Z-CONTRAST INVESTIGATION OF THE ORDERED ATOMIC INTERFACE OF COSI2/SI(001) LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID SCHOTTKY-BARRIER AB The atomic structure of mesotaxial CoSi2/Si(001) interfaces has been investigated by Z-contrast scanning transmission electron microscopy. The directly interpretable images reveal a 2 X 1 ordered structure at the interface, which is clearly seen to involve a doubling of the periodicity of the interfacial Co atoms. From these high-resolution images, we deduce a new structure model for the CoSi2/Si(001) interface. C1 FORSCHUNGSZENTRUM JULICH,INST SCHICHT & IONENTECH,W-5170 JULICH,GERMANY. RP CHISHOLM, MF (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Mantl, Siegfried/L-1317-2013; OI Mantl, Siegfried/0000-0002-4266-0619; Browning, Nigel/0000-0003-0491-251X NR 18 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 27 PY 1994 VL 64 IS 26 BP 3608 EP 3610 DI 10.1063/1.111214 PG 3 WC Physics, Applied SC Physics GA NU155 UT WOS:A1994NU15500029 ER PT J AU LOVEJOY, ML SIMMONS, JA HO, P MARTIN, PA AF LOVEJOY, ML SIMMONS, JA HO, P MARTIN, PA TI HYBRID SHUBNIKOV-DEHAAS PHOTOLUMINESCENCE ANALYSIS OF 2-DIMENSIONAL ELECTRON-DENSITY IN STRAINED-QUANTUM-WELL STRUCTURES WITH HEAVILY-DOPED CONTACT LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS AB A hybrid analysis technique is presented to accurately extract the two-dimensional (2D) electron density of PHEMT structures in which multiple subbands are occupied and severe parallel conduction by heavily doped contact layers occurs. Complications due to shorted Hall voltages by the parallel contact layer, which precludes simple Hall analysis, and to multiple subband occupation, which requires high magnetic-field sweeps in Shubnikov-de Haas (SdH) measurements, are eliminated by this hybrid analysis that combines SdH measurements with photoluminescence measurements to extract the total 2D density. Comparisons with other methods demonstrate the high accuracy of this new technique. C1 MARTIN MARIETTA ELECTR LAB,SYRACUSE,NY 13221. RP LOVEJOY, ML (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 27 PY 1994 VL 64 IS 26 BP 3634 EP 3636 DI 10.1063/1.111228 PG 3 WC Physics, Applied SC Physics GA NU155 UT WOS:A1994NU15500038 ER PT J AU MARRS, RE ELLIOTT, SR KNAPP, DA AF MARRS, RE ELLIOTT, SR KNAPP, DA TI PRODUCTION AND TRAPPING OF HYDROGENLIKE AND BARE URANIUM IONS IN AN ELECTRON-BEAM ION-TRAP SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGHLY CHARGED IONS; LAMB SHIFT; CROSS-SECTIONS; IMPACT IONIZATION; ELEMENTS; U89+ AB An equilibrium population of approximately 500 hydrogenlike U91+ ions and ten fully stripped U92+ ions has been produced and trapped in an electron beam ion trap at 198-keV electron energy. The equilibrium ionization balance, determined from the intensities of radiative recombination x rays, gives values of 1.55 +/- 0.27 and 2.82 +/- 0.35 b for the electron impact ionization cross sections of hydrogenlike and heliumlike uranium, respectively. These values are somewhat larger than relativistic distorted wave calculations, and much smaller than previous values inferred from stripping of accelerator beams. RP MARRS, RE (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 23 TC 179 Z9 187 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 JUN 27 PY 1994 VL 72 IS 26 BP 4082 EP 4085 DI 10.1103/PhysRevLett.72.4082 PG 4 WC Physics, Multidisciplinary SC Physics GA NU487 UT WOS:A1994NU48700007 ER PT J AU VAREKA, WA ZETTL, A AF VAREKA, WA ZETTL, A TI LINEAR TEMPERATURE-DEPENDENT RESISTIVITY AT CONSTANT VOLUME IN RB3C60 SO PHYSICAL REVIEW LETTERS LA English DT Article ID THIN-FILMS; K3C60; SUPERCONDUCTIVITY; C-60 AB The normal-state electrical resistivity p of the superconductor Rb3C60 has been measured as a function of temperature and hydrostatic pressure. Under conditions of constant sample volume we find a linear temperature dependence, rho approximately T, in sharp contrast to rho approximately T2 observed under conditions of constant sample pressure. The pressure dependence of rho at fixed temperature is exponential, with a reduction in rho by more than 50% for 8 kbar at room temperature. Implications for the normal-state scattering mechanism are discussed. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP VAREKA, WA (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 20 TC 42 Z9 42 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 27 PY 1994 VL 72 IS 26 BP 4121 EP 4124 DI 10.1103/PhysRevLett.72.4121 PG 4 WC Physics, Multidisciplinary SC Physics GA NU487 UT WOS:A1994NU48700017 ER PT J AU WURFEL, BE PIMENTEL, GC AF WURFEL, BE PIMENTEL, GC TI DETECTION OF S2 CHEMILUMINESCENCE IN SOLID AR USING A SOLID-STATE PHOTOMULTIPLIER SO CHEMICAL PHYSICS LETTERS LA English DT Article ID FREE JET; SPECTROSCOPY; IONIZATION; GENERATION; INTERFACES; EMISSION; SPECTRUM; SULFUR; MATRIX; S-2 AB We have developed a spectrometric system based on a single-photon counting solid-state photomultiplier (SSPM). The SSPM can count single photons from the visible (400 nm) into the infrared (28 mum) with a high quantum yield. We have used the visible photon counting abilities in order to develop proper amplification, electronics circuitry and optical methods for the SSPM, so that we may apply them to infrared studies in the future. Here we present a test study; we have recorded the B'' 3PI(u) --> X3SIGMA(g)- transitions of S2, created from the reactions of sulfur atoms in solid argon. C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. NR 33 TC 1 Z9 1 U1 1 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 JUN 24 PY 1994 VL 223 IS 4 BP 301 EP 304 DI 10.1016/0009-2614(94)00461-7 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NT080 UT WOS:A1994NT08000006 ER PT J AU YUN, T GUIOCHON, G AF YUN, T GUIOCHON, G TI MODELING OF RADIAL HETEROGENEITY IN CHROMATOGRAPHIC COLUMNS - COLUMNS WITH CYLINDRICAL SYMMETRY AND IDEAL MODEL SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article ID DIAMETER AB Elution band profiles are calculated for radially heterogeneous cylindrical columns, assuming an infinite rate of mass transfer kinetics and no axial dispersion. Steady-state flow-rate is assumed, with a given, cylindrical radial distribution of the. velocity. Parabolic, cuspal and cosinusoidal distributions were studied, all three with either the velocity maximum or minimum in the column center. In all cases, strong changes in the band profiles appear for velocity distributions in which the ratio of the maximum to the minimum velocity is as low as 1.05. Some of the profiles obtained appear to be similar to experimental profiles. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 18 TC 35 Z9 35 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD JUN 24 PY 1994 VL 672 IS 1-2 BP 1 EP 10 DI 10.1016/0021-9673(94)80589-X PG 10 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NV718 UT WOS:A1994NV71800001 ER PT J AU CLARK, JD DEHEINZELIN, J SCHICK, KD HART, WK WHITE, TD WOLDEGABRIEL, G WALTER, RC SUWA, G ASFAW, B VRBA, E SELASSIE, YH AF CLARK, JD DEHEINZELIN, J SCHICK, KD HART, WK WHITE, TD WOLDEGABRIEL, G WALTER, RC SUWA, G ASFAW, B VRBA, E SELASSIE, YH TI AFRICAN HOMO-ERECTUS - OLD RADIOMETRIC AGES AND YOUNG OLDOWAN ASSEMBLAGES IN THE MIDDLE-AWASH VALLEY, ETHIOPIA SO SCIENCE LA English DT Article ID SOUTHERN KENYA RIFT; OLDUVAI-GORGE; OLORGESAILIE; CALIBRATION; TANZANIA; CRANIUM; BODO AB Fossils and artifacts recovered from the middle Awash Valley of Ethiopia's Afar depression sample the Middle Pleistocene transition from Home erectus to Home sapiens. Ar/Ar ages, biostratigraphy, and tephrachronology from this area indicate that the Pleistocene Bodo hominid cranium and newer specimens are approximately 0.6 million years old. Only Oldowan chopper and flake assemblages are present in the lower stratigraphic units, but Acheulean bifacial artifacts are consistently prevalent and widespread in directly overlying deposits. This technological transition is related to a shift in sedimentary regime, supporting the hypothesis that Middle Pleistocene Oldowan assemblages represent a behavioral facies of the Acheulean industrial complex. C1 INST ROYAL SCI NAT BELGIQUE,B-1040 BRUSSELS,BELGIUM. INDIANA UNIV,DEPT ANTHROPOL,BLOOMINGTON,IN 47405. MIAMI UNIV,DEPT GEOL,OXFORD,OH 45056. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. INST HUMAN ORIGINS,CTR GEOCHRONOL,BERKELEY,CA 94709. UNIV TOKYO,FAC SCI,DEPT ANTHROPOL,TOKYO 113,JAPAN. YALE UNIV,DEPT GEOL & GEOPHYS,NEW HAVEN,CT 06511. RP CLARK, JD (reprint author), UNIV CALIF BERKELEY,DEPT ANTHROPOL,HUMAN EVOLUTIONARY STUDIES LAB,BERKELEY,CA 94720, USA. NR 30 TC 96 Z9 103 U1 0 U2 14 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 24 PY 1994 VL 264 IS 5167 BP 1907 EP 1910 DI 10.1126/science.8009220 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NT847 UT WOS:A1994NT84700037 PM 8009220 ER PT J AU PRUDENT, JR UNO, T SCHULTZ, PG AF PRUDENT, JR UNO, T SCHULTZ, PG TI EXPANDING THE SCOPE OF RNA CATALYSIS SO SCIENCE LA English DT Article ID LIGANDS; ENZYME; ANTIBODIES; EVOLUTION; LIBRARY; TETRAHYMENA; MOLECULES; SELECTION; RIBOZYME; INVITRO AB The basic notions of transition state theory have been exploited in the past to generate highly selective catalysts from the vast library of antibody molecules in the immune system. These same ideas were used to isolate an RNA molecule, from a large library of RNAs, that catalyzes the isomerization of a bridged biphenyl. The RNA-catalyzed reaction displays Michaelis-Menten kinetics with a catalytic rate constant (k(cat)) of 2.8 x 10(-5) per minute and a Michaelis constant (K-m) of 542 mu M; the reaction is competitively inhibited by the planar transition state analog with an inhibition constant (K-i) value of similar to 7 mu M. This approach may provide a general strategy for expanding the scope of RNA catalysis beyond those reactions in which the substrates are nucleic acids or nucleic acid derivatives. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM08352A] NR 32 TC 134 Z9 137 U1 3 U2 13 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 24 PY 1994 VL 264 IS 5167 BP 1924 EP 1927 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NT847 UT WOS:A1994NT84700043 PM 8009223 ER PT J AU NANCARROW, JK KREMER, E HOLMAN, K EYRE, H DOGGETT, NA LEPASLIER, D CALLEN, DF SUTHERLAND, GR RICHARDS, RI AF NANCARROW, JK KREMER, E HOLMAN, K EYRE, H DOGGETT, NA LEPASLIER, D CALLEN, DF SUTHERLAND, GR RICHARDS, RI TI IMPLICATIONS OF FRA16A STRUCTURE FOR THE MECHANISM OF CHROMOSOMAL FRAGILE SITE GENESIS SO SCIENCE LA English DT Article ID X-SYNDROME; HUNTINGTONS-DISEASE; MYOTONIC-DYSTROPHY; MENTAL-RETARDATION; MOLECULAR ANALYSIS; UNSTABLE ELEMENT; REPEAT SEQUENCE; FMR1 GENE; DNA; INSTABILITY AB Fragile sites are chemically induced nonstaining gaps in chromosomes. Different fragile sites vary in frequency in the population and in the chemistry of their induction. DNA sequences encompassing and including the rare, autosomal, folate-sensitive fragile site, FRA16A, were isolated by positional cloning. The molecular basis of FRA16A was found to be expansion of a normally polymorphic p(CCG), repeat. This repeat was adjacent to a CpG island that was methylated in fragile site-expressing individuals. The FRA16A locus in individuals who do not express the fragile site is not a site of DNA methylation (imprinting), which suggests that the methylation associated with fragile sites may be a consequence and not a cause of their genesis. C1 WOMENS & CHILDRENS HOSP,CTR GENET MED,DEPT CYTOGENET & MOLEC GENET,ADELAIDE,SA 5006,AUSTRALIA. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. CTR ETUD POLYMORPHISME HUMAIN,F-750101 PARIS,FRANCE. RI Sutherland, Grant/D-2606-2012; Callen, David/G-1975-2012; Kremer, Eric /D-3734-2013; OI Callen, David/0000-0002-6189-9991 NR 30 TC 133 Z9 134 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 24 PY 1994 VL 264 IS 5167 BP 1938 EP 1941 DI 10.1126/science.8009225 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NT847 UT WOS:A1994NT84700047 PM 8009225 ER PT J AU QUIGG, C AF QUIGG, C TI CONCEPTUAL FOUNDATIONS OF MODERN PARTICLE PHYSICS - MARSHAK,RE SO SCIENCE LA English DT Book Review RP QUIGG, C (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,BATAVIA,IL 60510, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 24 PY 1994 VL 264 IS 5167 BP 1952 EP 1952 DI 10.1126/science.264.5167.1952 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NT847 UT WOS:A1994NT84700051 PM 17794080 ER PT J AU LEBED, RF LUTY, MA AF LEBED, RF LUTY, MA TI BARYON MASSES AT 2ND-ORDER IN CHIRAL PERTURBATION-THEORY SO PHYSICS LETTERS B LA English DT Article ID QUARKS AB We analyze the octet baryon mass differences up to second order in chiral perturbation theory, including the effects of decuplet intermediate states. We show that the Coleman-Glashow relation has computable corrections of order (m(d)-m(u))m(s). These corrections are numerically small, and in agreement with the data. We also show that corrections to the SIGMA equal-spacing rule are dominated by electromagnetic contributions, and that the Gell-Mann-Okubo formula has non-analytic corrections of order m(s)2 ln m(s) which cannot be computed from known matrix elements. We also show that the baryon masses cannot be used to extract model-independent information about the current quark masses. RP LEBED, RF (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 23 TC 26 Z9 26 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 JUN 23 PY 1994 VL 329 IS 4 BP 479 EP 485 DI 10.1016/0370-2693(94)91093-6 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT945 UT WOS:A1994NT94500011 ER PT J AU GAVIN, S MULLER, B AF GAVIN, S MULLER, B TI LARGER DOMAINS OF DISORIENTED CHIRAL CONDENSATE THROUGH ANNEALING SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; BOSE-EINSTEIN CONDENSATION; FINITE-TEMPERATURE; EMULSION CHAMBERS; PHASE-TRANSITIONS; SYMMETRY-BREAKING; ENERGY; SEARCH; GROWTH; QCD AB Relativistic heavy ion collisions can generate metastable domains in which the chiral condensate is disoriented. Nucleus-sized domains can yield measurable fluctuations in the number of neutral and charged pions. We propose a scenario in which domains are ''annealed'' by a dynamically evolving effective potential in the heavy ion system. Domains of sizes exceeding 3 fm are possible in this scenario. C1 DUKE UNIV,DEPT PHYS,DURHAM,NC 27708. RP GAVIN, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,POB 5000,UPTON,NY 11973, USA. NR 41 TC 112 Z9 112 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 JUN 23 PY 1994 VL 329 IS 4 BP 486 EP 492 DI 10.1016/0370-2693(94)91094-4 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT945 UT WOS:A1994NT94500012 ER PT J AU STOLL, SL STACY, AM TORARDI, CC AF STOLL, SL STACY, AM TORARDI, CC TI SINGLE-CRYSTAL GROWTH, ALKALI-METAL ORDERING, AND SUPERCONDUCTIVITY IN LA2-XMXCUO4 (M = NA, K) SO INORGANIC CHEMISTRY LA English DT Article ID CUPRATE SUPERCONDUCTORS; COPPER OXIDES; LA2CUO4 AB Single crystals of La2-xMxCuO4, where M is Na or K, have been prepared by precipitation from molten NaOH at 320-degrees-C or from molten KOH at 450-degrees-C. The composition of several individual crystals as determined by wavelength-dispersive X-ray fluorescence analysis averaged to La1.88Na0.12CuO4 and La1.79K0.21CuO4. Iodometric titrations on polycrystalline samples with identical compositions showed that the formal oxidation states for the Cu atoms are +2.19 and +2.31, respectively. On the basis of the analysis of single-crystal X-ray diffraction data, it has been determined that the alkali metal doped lanthanum copper oxides crystallize in a new structure type that is distinct from the analogous phases containing alkaline earth metal ions. The space group is P4/nmm, and lattice parameters are a = 3.766(1) angstrom, c = 13.216(5) angstrom for the Na-doped material and a = 3.7708(7) angstrom, c = 13.321(2) angstrom for the K-doped material. In these phases, the alkali metal ions are ordered in the rock-salt blocks, and the Cu atoms are displaced out of the plane toward the alkali metal ions. Despite this distortion of the CuO2 planes, both phases exhibit superconductivity, near 26 and 6 K, respectively. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. DUPONT CO INC,CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880. NR 32 TC 22 Z9 22 U1 3 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 22 PY 1994 VL 33 IS 13 BP 2761 EP 2765 DI 10.1021/ic00091a016 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NV311 UT WOS:A1994NV31100016 ER PT J AU MISKOWSKI, VM RICE, SF GRAY, HB DALLINGER, RF MILDER, SJ HILL, MG EXSTROM, CL MANN, KR AF MISKOWSKI, VM RICE, SF GRAY, HB DALLINGER, RF MILDER, SJ HILL, MG EXSTROM, CL MANN, KR TI SPECTROSCOPY AND PHOTOPHYSICS OF RH2(DIMEN)4(2+) (DIMEN = 1,8-DIISOCYANOMENTHANE) - EXCEPTIONAL METAL-METAL BOND SHORTENING IN THE LOWEST ELECTRONIC EXCITED-STATES SO INORGANIC CHEMISTRY LA English DT Article ID RHODIUM(I) ISOCYANIDE COMPLEXES; RAY CRYSTAL-STRUCTURE; NONRADIATIVE DECAY; SPECTRA; ABSORPTION; 2,5-DIISOCYANO-2,5-DIMETHYLHEXANE; 1,8-DIISOCYANO-PARA-MENTHANE; OXIDATION; IONS; HG2 AB Rh2(dimen)4(2+) (dimen = 1,8-diisocyanomenthane) exhibits very long Rh-Rh bond distances in the solid state (varying from 4.48 angstrom for the PF6- salt to 3.861 angstrom for the B(C6H5)4-salt), but the lowest dsigma* --> psigma excitation produces an excited state with a considerably shorter Rh-Rh distance (approximately 3.2 angstrom). Several techniques (absorption, single-crystal polarized absorption, emission, polarized excitation, resonance Raman, fluorescence, phosphorescence lifetime data, and MM2 calculations) help describe the ground- and lowest excited-state potential energy surfaces of this complex. The absorption corresponding to dsigma* --> psigma singlet-singlet excitation (1A1g --> 1A2u) is markedly asymmetric, with a sharp maximum (420-440 nm) and a long tailing shoulder (approximately 480 nm). A similarly asymmetric dsigma* --> psigma singlet-triplet feature (1A1g --> 3A2u) is observed approximately 3000 cm-1 below the singlet-singlet band in the polarized single-crystal spectra of the B(C6H5)4- salt. In contrast, the corresponding emission bands (545-600 nm, fluorescence; 660-714 nm, phosphorescence) are nearly symmetric. The spectroscopic properties are interpreted in terms of ground- and excited-state potential surfaces that combine parameters derived from previous work on more conventional (Rh(I)2 systems with the results of MM2 calculations of dimen deformations. The calculated ground-state surface is very shallow, with a minimum at 4.75 angstrom, but nearly harmonic in the range of interest. The calculated excited-state surface is extremely anharmonic: after a well-defined minimum at 3.35 angstrom, it is broad and shallow at longer Rh-Rh distances. For Rh-Rh distances greater than approximately 4 angstrom, the calculations predict that the individual Rh(I) square planes of Rh2(dimen)4(2+) will be eclipsed; at shorter distances, these units are expected to twist (at a dihedral angle inversely proportional to the Rh-Rh separation) to relieve the substantial strain energy involved in distorting Rh2(dimen)4(2+) along the square planar, a2u bending coordinate. These predictions are consistent with the crystal structures of [Rh2(dimen)4][PF6]2 (Rh-Rh = 4.48 angstrom; dihedral twist angle = 0-degrees) and [Rh2(dimen)4] [B(C6H5)4]2 (Rh-Rh = 3.861 angstrom; dihedral twist angle = 16.2-degrees) and provide an explanation for the dramatic rigidochromic effect (1000-cm-1 blue shift) on the emission as the temperature is lowered through the glass transition of solutions. C1 WABASH COLL,DEPT CHEM,CRAWFORDSVILLE,IN 47933. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55455. RP MISKOWSKI, VM (reprint author), CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,PASADENA,CA 91125, USA. NR 38 TC 34 Z9 34 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 22 PY 1994 VL 33 IS 13 BP 2799 EP 2807 DI 10.1021/ic00091a021 PG 9 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NV311 UT WOS:A1994NV31100021 ER PT J AU KUBAS, GJ NELSON, JE BRYAN, JC ECKERT, J WISNIEWSKI, L ZILM, K AF KUBAS, GJ NELSON, JE BRYAN, JC ECKERT, J WISNIEWSKI, L ZILM, K TI ISOLATION OF AN EXTREMELY LABILE DIHYDROGEN COMPLEX, CR(CO)3(PPR(I)3)2(H2), CONTAINING THE SHORTEST LIGATED H-H BOND SO INORGANIC CHEMISTRY LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; M = CR; INELASTIC-NEUTRON-SCATTERING; TRANSITION-METALS; POLYHYDRIDE COMPLEXES; CONTAINING MATRICES; IRON COMPLEX; SOLID-STATE; X-RAY; LIGAND AB First-row members of the group 6 series of transition metal dihydrogen complexes Cr(CO)3(PR3)2(eta2-H-2) (R = Cy, Pr(i)) have been synthesized and examined by X-ray crystallography and NMR, infrared, and inelastic neutron scattering spectroscopies. The complexes completely dissociate H-2 insolution to give Cr(CO)3(PR3)2, which contains an agostic C-H interaction. An X-ray structure of Cr(CO)3(PPri3)2(H2) showed a side-bonded dihydrogen ligand with H-H = 0.67(5) angstrom, and proton NMR of the HD isotopomer showed a J(HD) value of 35 Hz. Solid-state H-1 NMR spectroscopy of the PCy3 complex indicated that the H-H separation is 0.85(1) angstrom, which is believed to be a more precise and accurate measure of this key parameter. The barrier to rotation of the eta2-H-2 has been recalculated to be 1.17(10) kcal/mol, as compared with 1.32(10) and 1.9(1) kcal/mol for the Mo and W analogues, based on H-H distances from solid-state NMR. Correlations of properties of the group 6 species indicate that the H-2 --> M sigma-bonding strength appears to increase as Mo < Cr approximately W but that dpi --> H-2 sigma* back-bonding increases down the group. It might be generally concluded that back-bonding is more of a factor than sigma-bonding in influencing stability, H-H distance, and possibly overall bond strengths. Crystallographic data: space group P2(1)/c, a = 13.457(3) 3) angstrom, b = 11.493(3) angstrom, c = 16.639(4) angstrom, beta = 102.25(2)degrees, Z = 4, R = 3.32%. C1 YALE UNIV,DEPT CHEM,NEW HAVEN,CT 06520. LOS ALAMOS NATL LAB,LANSCE GRP,LOS ALAMOS,NM 87545. RP KUBAS, GJ (reprint author), LOS ALAMOS NATL LAB,CST3 GRP,LOS ALAMOS,NM 87545, USA. NR 45 TC 49 Z9 49 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 22 PY 1994 VL 33 IS 13 BP 2954 EP 2960 DI 10.1021/ic00091a039 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NV311 UT WOS:A1994NV31100039 ER PT J AU HUD, NV MILANOVICH, FP BALHORN, R AF HUD, NV MILANOVICH, FP BALHORN, R TI EVIDENCE OF NOVEL SECONDARY STRUCTURE IN DNA-BOUND PROTAMINE IS REVEALED BY RAMAN-SPECTROSCOPY SO BIOCHEMISTRY LA English DT Article ID X-RAY-DIFFRACTION; NUCLEOPROTAMINE STRUCTURE; VIBRATIONAL ANALYSIS; NUCLEIC-ACIDS; GERM-CELLS; B-DNA; A-DNA; CONFORMATION; PROTEINS; COMPLEXES AB Raman spectroscopy studies of protamine-DNA complexes are reported for samples in the solid state at 98% relative humidity. Previous reports utilizing other physical techniques have indicated the presence of B-form DNA in protamine-DNA complexes. The present Raman data support the assignment of a modified B-form which is characterized by appreciable unstacking of the bases. The quality of the present spectra has made it possible, for the first time, to obtain the Raman spectrum of DNA-bound protamine by digital spectral subtraction. The difference spectrum indicates that protamine adopts an unusual secondary structure upon binding to DNA. A dominant amide I band is observed at 1683 cm(-1) which is indicative of neither an alpha-helix or beta-sheet conformation. An amide I band at this position has been associated with the 1-->3 hydrogen bond that occurs within a gamma-turn [Bandekar, J., and Krimm, S. (1985) Int. J. Pept. Protein Res. 26, 158-165]. On the basis of this assignment, as well as preliminary results obtained by computer modeling, we propose a new model for the secondary structure of DNA-bound protamine that is rich in 1-->3 hydrogen bonding. Spectral data demonstrate that this structure is absent in protamine molecules in solution. Analyses of spectra of polyarginine-DNA complexes suggest that polyarginine, although similar to protamine in primary structure, assumes a conformation when bound to DNA that is distinct from that adopted by protamine. C1 LAWRENCE LIVERMORE NATL LAB,DIV PHYS,LIVERMORE,CA 94551. RP HUD, NV (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551, USA. NR 54 TC 66 Z9 69 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD JUN 21 PY 1994 VL 33 IS 24 BP 7528 EP 7535 DI 10.1021/bi00190a005 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NU490 UT WOS:A1994NU49000005 PM 8011618 ER PT J AU EICHINGER, WE COOPER, DI ARCHULETTA, FL HOF, D HOLTKAMP, DB KARL, RR QUICK, CR TIEE, J AF EICHINGER, WE COOPER, DI ARCHULETTA, FL HOF, D HOLTKAMP, DB KARL, RR QUICK, CR TIEE, J TI DEVELOPMENT OF A SCANNING, SOLAR-BLIND, WATER RAMAN LIDAR SO APPLIED OPTICS LA English DT Article DE RAMAN LIDAR; REMOTE SENSING; WATER-VAPOR CONCENTRATION; EVAPORATIVE FLUXES; BOUNDARY LAYER; MICROMETEOROLOGY ID PLANETARY BOUNDARY-LAYER; SURFACE-LAYER; FLUX MEASUREMENTS; VAPOR; TURBULENCE; VELOCITY; WIND AB The need for an instrument capable of measuring water-vapor fluxes over mixed canopy and large areas has long been recognized. Such a device would greatly enhance the study of evapotranspiration Processes and has great practical value for water management. To address this problem, a scanning water Raman lidar has been designed and constructed. Analytical methods have also been developed to take advantage of the type of information that this lidar can generate. The lidar is able to measure the absolute water content and calculate the evaporative flux quickly over relatively large areas. This capability provides new opportunities for the study of microscale atmospheric processes. The variogram data indicate that the spatial sampling size must be of the order of 10 m if fluxes and scalars are to be properly represented. Examples of data are presented. RP EICHINGER, WE (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 20 TC 30 Z9 31 U1 0 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 JUN 20 PY 1994 VL 33 IS 18 BP 3923 EP 3932 PG 10 WC Optics SC Optics GA NU525 UT WOS:A1994NU52500021 PM 20935738 ER PT J AU MCENALLY, CS SAWYER, RF KOSHLAND, CP LUCAS, D AF MCENALLY, CS SAWYER, RF KOSHLAND, CP LUCAS, D TI SENSITIVE IN-SITU DETECTION OF CHLORINATED HYDROCARBONS IN GAS-MIXTURES SO APPLIED OPTICS LA English DT Article DE CONTINUOUS MONITORING; CHLORINATED HYDROCARBONS; LASER FRAGMENTATION LASER-INDUCED FLUORESCENCE ID LASER-INDUCED FLUORESCENCE; MULTIPHOTON DISSOCIATION; CCL; PHOTOFRAGMENTATION; PHOTOCHEMISTRY; SPECTROSCOPY AB We detect chlorinated hydrocarbons (CHC's) in gas mixtures by dissociating the CHC's with a 193-nm laser and measuring the subsequent concentration of the CCl fragmentation by means of laser-induced fluorescence. Sub-ppm detection, where ppm indicates parts in 10(6), is achieved for C2H5Cl with a 10-mm3 measurement volume and integration over 50 laser shots. Every other CHC tested is also detectable, with the same or better detection limits. The CCl forms promptly during the fragmentation laser pulse through unimolecular dissociation of the parent CHC's. The technique should be a useful diagnostic for CHC incineration systems. C1 UNIV CALIF BERKELEY, DEPT MECH ENGN, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT BIOMED & ENVIRONM HLTH SCI, BERKELEY, CA 94720 USA. RP MCENALLY, CS (reprint author), LAWRENCE BERKELEY LAB, DIV ENERGY & ENVIRONM, BERKELEY, CA 94720 USA. RI Sawyer, Robert/B-5013-2014; McEnally, Charles/N-9999-2016 OI McEnally, Charles/0000-0002-6820-921X NR 30 TC 21 Z9 21 U1 0 U2 2 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 JUN 20 PY 1994 VL 33 IS 18 BP 3977 EP 3984 PG 8 WC Optics SC Optics GA NU525 UT WOS:A1994NU52500027 PM 20935744 ER PT J AU JONES, MR CURRY, BP BREWSTER, MQ LEONG, KH AF JONES, MR CURRY, BP BREWSTER, MQ LEONG, KH TI INVERSION OF LIGHT-SCATTERING MEASUREMENTS FOR PARTICLE-SIZE AND OPTICAL-CONSTANTS - THEORETICAL-STUDY SO APPLIED OPTICS LA English DT Article DE OPTICAL PARTICLE SIZING; INVERSE PROBLEMS ID ANALYTIC EIGENFUNCTION THEORY; SINGULAR-SYSTEM-ANALYSIS; REMOTE-SENSING DATA; FRAUNHOFER-DIFFRACTION; INFORMATION-CONTENT; DISCRETE-DATA; DISTRIBUTIONS AB We invert the Fredholm equation representing the light scattered by a single spherical particle or a distribution of spherical particles to obtain the particle size distribution function and refractive index. We obtain the solution by expanding the distribution function as a linear combination of a set of orthonormal basis functions. The set of orthonormal basis functions is composed of Schmidt-Hilbert eigenfunctions and a set of supplemental basis functions, which have been orthogonalized with respect to the Schmidt-Hilbert eigenfunctions by using the Gram-Schmidt orthogonalization procedure. We use the orthogonality properties of the basis functions and of the eigenvectors of the kernel covariance matrix to obtain the solution that minimizes the residual errors subject to a trial function constraint. The inversion process is described, and results from the inversion of several simulated data sets are presented. C1 UNIV ILLINOIS, DEPT MECH & IND ENGN, URBANA, IL 61801 USA. RP JONES, MR (reprint author), ARGONNE NATL LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 27 TC 37 Z9 38 U1 0 U2 2 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 JUN 20 PY 1994 VL 33 IS 18 BP 4025 EP 4034 PG 10 WC Optics SC Optics GA NU525 UT WOS:A1994NU52500032 PM 20935749 ER PT J AU JONES, MR LEONG, KH BREWSTER, MQ CURRY, BP AF JONES, MR LEONG, KH BREWSTER, MQ CURRY, BP TI INVERSION OF LIGHT-SCATTERING MEASUREMENTS FOR PARTICLE-SIZE AND OPTICAL-CONSTANTS - EXPERIMENTAL-STUDY SO APPLIED OPTICS LA English DT Article DE OPTICAL PARTICLE SIZING; INVERSE PROBLEMS; LIGHT-SCATTERING MEASUREMENTS AB Measurements of the light scattered by a sample contain information regarding the physical properties of the sample. Laser tight-scattering measurements can be made unobtrusively in environments that are inaccessible to other types of measurements, so laser light-scattering techniques have become an important tool in aerosol research. The primary difficulty associated with using light-scattering techniques to determine aerosol particle properties is inverting the measurements or extracting the desired information from the measurements. In this study we use a 15-channel polar nephelometer to measure the light-scattering patterns of monodisperse polystyrene spheres. The light-scattering measurements are inverted, and the particle size distribution function and optical properties of the particles are retrieved. The results of these inversions are presented after a brief description of the calibration and operation of the nephelometer. C1 UNIV ILLINOIS, DEPT MECH & IND ENGN, URBANA, IL 61801 USA. RP JONES, MR (reprint author), ARGONNE NATL LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 9 TC 14 Z9 15 U1 0 U2 2 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 JUN 20 PY 1994 VL 33 IS 18 BP 4035 EP 4041 PG 7 WC Optics SC Optics GA NU525 UT WOS:A1994NU52500033 PM 20935750 ER PT J AU WARREN, WL FLEETWOOD, DM SHANEYFELT, MR SCHWANK, JR WINOKUR, PS DEVINE, RAB MATHIOT, D AF WARREN, WL FLEETWOOD, DM SHANEYFELT, MR SCHWANK, JR WINOKUR, PS DEVINE, RAB MATHIOT, D TI LINKS BETWEEN OXIDE, INTERFACE, AND BORDER TRAPS IN HIGH-TEMPERATURE ANNEALED SI SIO2 SYSTEMS SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMICONDUCTOR CAPACITORS; POINT-DEFECTS; MOS DEVICES; GENERATION; SILICON; CHARGE; TRANSISTORS; DIFFUSIVITY; CENTERS; STATES AB Evidence is provided to show that enhanced hole-, interface-, and border-trap generation in irradiated high-temperature annealed Si/SiO2/Si systems are all related either directly, or indirectly, to the presence of oxygen vacancies. We find that the calculated oxygen vacancy due to high-temperature anneals from 800 to 950-degrees-C in metal-oxide-semiconductor capacitors closely matches the radiation-induced oxide-trapped charge. This strongly suggests that oxygen vacancies (or vacancy-related complexes) are the dominant hole trapping sites in this particular case. Along with the increase in radiation-induced oxide-trap charge, we observe a concomitant increase in the interface- and border-trap densities. This suggests that in devices that receive high-temperature anneals, all these phenomena are linked to the existence of oxygen vacancies either directly, or indirectly, perhaps via hole trapping at these vacancies. C1 FRANCE TELECOM,CNET,F-38243 MEYLAN,FRANCE. RP WARREN, WL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI MATHIOT, Daniel/E-7629-2010 OI MATHIOT, Daniel/0000-0003-2845-3776 NR 25 TC 51 Z9 51 U1 3 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 20 PY 1994 VL 64 IS 25 BP 3452 EP 3454 DI 10.1063/1.111943 PG 3 WC Physics, Applied SC Physics GA NT353 UT WOS:A1994NT35300030 ER PT J AU MIKLICH, AH KOELLE, D SHAW, TJ LUDWIG, F NEMETH, DT DANTSKER, E CLARKE, J MCNALFORD, N BUTTON, TW COLCLOUGH, MS AF MIKLICH, AH KOELLE, D SHAW, TJ LUDWIG, F NEMETH, DT DANTSKER, E CLARKE, J MCNALFORD, N BUTTON, TW COLCLOUGH, MS TI LOW-FREQUENCY EXCESS NOISE IN YBA2CU3O7-X DC SUPERCONDUCTING QUANTUM INTERFACES DEVICES COOLED IN STATIC MAGNETIC-FIELDS SO APPLIED PHYSICS LETTERS LA English DT Article ID THICK-FILMS; 1/F NOISE; SQUIDS AB We have investigated the performance of YBa2Cu3O7-x dc superconducting quantum interference devices (SQUIDs) cooled in static magnetic fields, B0, of 0.01-1 mT. For fields less than the earth's ambient field, about 0.05 mT, the white noise of the devices at 77 K is not materially affected. However, at a frequency f of 1 Hz the spectral density of the 1/f noise, S(PHI) (1 Hz), at 0.05 mT increases by an order of magnitude over that for zero field. Furthermore, S(PHI) (1 Hz) scales approximately linearly with B0, suggesting strongly that the noise originates in the motion of vortices in the YBCO film. This increase in noise is likely to be an issue for SQUIDs operated in the earth's field. C1 ICI SUPERCOND TIOXIDE SPECIALISTS LTD, BILLINGHAM TS23 1PS, CLEVELAND, ENGLAND. 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; Button, Tim/I-6803-2012 NR 17 TC 49 Z9 49 U1 0 U2 1 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 JUN 20 PY 1994 VL 64 IS 25 BP 3494 EP 3496 DI 10.1063/1.111251 PG 3 WC Physics, Applied SC Physics GA NT353 UT WOS:A1994NT35300044 ER PT J AU MILLER, RS BECKERSZENDY, R BRATTON, CB BREAULT, J CASPER, D DYE, ST GAJEWSKI, W GOLDHABER, M HAINES, TJ HALVERSON, PG KIELCZEWSKA, D KROPP, WR LEARNED, JG LOSECCO, J MATSUNO, S MATTHEWS, J MCGRATH, G MCGREW, C PRICE, L REINES, F SCHULTZ, J SINCLAIR, D SOBEL, HW STONE, JL SULAK, LR SVOBODA, R VANDERVELDE, JC AF MILLER, RS BECKERSZENDY, R BRATTON, CB BREAULT, J CASPER, D DYE, ST GAJEWSKI, W GOLDHABER, M HAINES, TJ HALVERSON, PG KIELCZEWSKA, D KROPP, WR LEARNED, JG LOSECCO, J MATSUNO, S MATTHEWS, J MCGRATH, G MCGREW, C PRICE, L REINES, F SCHULTZ, J SINCLAIR, D SOBEL, HW STONE, JL SULAK, LR SVOBODA, R VANDERVELDE, JC TI A SEARCH FOR ASTROPHYSICAL SOURCES OF LOW-ENERGY NEUTRINOS USING THE IMB DETECTOR SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, COSMIC RAYS; ELEMENTARY PARTICLES; GAMMA-RAYS, BURSTS; SUPERNOVAE, GENERAL ID BURST AB The temporal structure of low-energy (20-60 MeV) neutrino interactions within the IMB-3 detector during 863 days of livetime between 1986 May and 1991 March has been analyzed. The neutrino data are consistent with expected cosmic-ray-induced neutrino interactions with no bursts evident (excluding SN 1987A). When combined with the 327 effective livedays of IMB-1 data, we place a 90% C.L. upper limit of less-than-or-equal-to 0.71 Galactic supernovae yr-1. We have also performed a temporal correlation analysis with gamma-ray bursts (GRBs) using a subset of the low-energy neutrino data. No significant correlations were observed for coincidence windows of 1 minute, 1 hour, or 1 day. C1 LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. SLAC,STANFORD,CA 94309. CLEVELAND STATE UNIV,CLEVELAND,OH 44115. UNIV CALIF IRVINE,IRVINE,CA 92717. CERN,CH-1211 GENEVA 23,SWITZERLAND. BOSTON UNIV,BOSTON,MA 02215. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV MARYLAND,COLL PK,MD 20742. UNIV WARSAW,PL-00325 WARSAW,POLAND. UNIV HAWAII,HONOLULU,HI 96822. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV MICHIGAN,ANN ARBOR,MI 48109. RI Sobel, Henry/A-4369-2011; OI Matthews, James/0000-0002-1832-4420 NR 13 TC 6 Z9 6 U1 1 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1994 VL 428 IS 2 BP 629 EP 632 DI 10.1086/174272 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NQ751 UT WOS:A1994NQ75100021 ER PT J AU HOOKER, BS SKEEN, RS PETERSEN, JN AF HOOKER, BS SKEEN, RS PETERSEN, JN TI BIOLOGICAL DESTRUCTION OF CCL4 .2. KINETIC MODELING SO BIOTECHNOLOGY AND BIOENGINEERING LA English DT Article DE KINETIC MODEL; DENITRIFY; CARBON TETRACHLORIDE; DESTRUCTION ID METHANE-OXIDIZING BACTERIA; COMPETITIVE-INHIBITION; MIXED-CULTURE; BIODEGRADATION; BIOFILM; HYDROCARBONS; TOXICITY AB A denitrifying consortium capable of transforming carbon tetrachloride (CCl4) was cultured from an aquifer soil sample from the U.S. Department of Energy's Hanford Site in southeastern Washington State. A mathematical description of the kinetics of CCl4 destruction by this microbial consortium is presented, and its predictions are compared to experimental data. The model successfully predicted the concentrations of acetate, nitrate, nitrite, biomass, and CCl4 for all 12 experiments (a total of 60 concentration-vs.-time data sets). In addition, no statistically significant interactions exist between parameter values and individual test conditions. The ability of the model to predict the results of a treatability test for CCl4 degradation in Hanford groundwater, without adjusting any model parameters, is discussed. (C) 1994 John Wiley & Sons, Inc. C1 PACIFIC NW LAB, CTR WASTE TECHNOL, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV, DEPT CHEM ENGN, PULLMAN, WA 99164 USA. TRI STATE UNIV, DEPT CHEM ENGN, ANGOLA, IN 46703 USA. RI Petersen, James/B-8924-2008 NR 20 TC 19 Z9 19 U1 3 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3592 J9 BIOTECHNOL BIOENG JI Biotechnol. Bioeng. PD JUN 20 PY 1994 VL 44 IS 2 BP 211 EP 218 DI 10.1002/bit.260440210 PG 8 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA NM626 UT WOS:A1994NM62600009 PM 18618687 ER PT J AU WEDMAN, DE AF WEDMAN, DE TI CHEMICAL CALCULATOR IS HERE SO CHEMICAL & ENGINEERING NEWS LA English DT Letter C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD JUN 20 PY 1994 VL 72 IS 25 BP 4 EP 4 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA NT355 UT WOS:A1994NT35500001 ER PT J AU DIBB, JE MEEKER, LD FINKEL, RC SOUTHON, JR CAFFEE, MW BARRIE, LA AF DIBB, JE MEEKER, LD FINKEL, RC SOUTHON, JR CAFFEE, MW BARRIE, LA TI ESTIMATION OF STRATOSPHERIC INPUT TO THE ARCTIC TROPOSPHERE - BE-7 AND BE-10 IN AEROSOLS AT ALERT, CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SURFACE AIR; WINTER; TRANSPORT; MODEL; OZONE AB Concentrations of Be-7 and Pb-210 in 2 years of weekly high-volume aerosol samples collected at Alert, Northwest Territories, Canada, showed pronounced seasonal variations. We observed a broad winter peak in Pb-210 concentration and a spring peak in Be-7. These peaks were similar in magnitude and duration to previously reported results for a number of stations in the Arctic Basin. Beryllium 10 concentrations (determined only during the first year of this study) were well correlated with those of Be-7; the atom ratio Be-10/Be-7 was nearly constant at 2.2 throughout the year. This relatively high value of Be-10/Be-7 indicates that the stratosphere must constitute an important source of both Be isotopes in the Arctic troposphere throughout the year. A simple mixing model based on the small seasonal variations of Be-10/Be-7 indicates an approximately twofold increase of stratospheric influence in the free troposphere in late summer. The spring maxima in concentrations of both Be isotopes at the surface apparently reflect vertical mixing in rather than stratospheric injections into the troposphere. We have merged the results of the Be-based mixing model with weekly O3 soundings to assess Arctic stratospheric impact on the surface O3 budget at Alert. The resulting estimates indicate that stratospheric inputs can account for a maximum of 10-15% of the O3 at the surface in spring and for less during the rest of the year. These estimates are most uncertain during the winter. The combination of Be isotopic measurements and O3 vertical profiles could allow quantification of the contributions Of O3 from the Arctic stratosphere and lower latitude regions to the O3 budget in the Arctic troposphere. Although at present the lack of a quantitative understanding of the temporal variation Of O3 lifetime in the Arctic troposphere precludes making definitive calculations, qualitative examples of the power of this approach are given, C1 ATMOSPHER ENVIRONM SERV, DOWNSVIEW, ON, CANADA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP DIBB, JE (reprint author), UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, GLACIER RES GRP, DURHAM, NH 03824 USA. RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 41 TC 73 Z9 75 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JUN 20 PY 1994 VL 99 IS D6 BP 12855 EP 12864 DI 10.1029/94JD00742 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NT337 UT WOS:A1994NT33700007 ER PT J AU WU, M SEARS, TJ AF WU, M SEARS, TJ TI STIMULATED-EMISSION PUMPING SPECTROSCOPY OF (2)SIGMA AND (2)PI VIBRONIC LEVELS IN (X)OVER-TILDE(V(1)V(2)0) (2)PI NCO SO MOLECULAR PHYSICS LA English DT Article ID FERMI-RESONANCE INTERACTIONS; EXCITED BENDING LEVELS; RENNER-TELLER; SPIN-ORBIT; TRIATOMIC-MOLECULES; LINEAR-MOLECULES; X2-PI NCO; STATE; FLUORESCENCE; NCO(X2-PI) AB We report measurements of 2SIGMA symmetry rovibronic levels in the (v1 v2, v3) = (110)/(030) Fermi-resonant polyad and the 040 mu 2PI states of NCO. The levels were detected by the technique of stimulated emission pumping spectroscopy in a supersonic free jet expansion following excitation of rotational lines in the A(100) 2SIGMA+ -X(000) 2PI transition of the radical. Combining the new measurements and previously published data we have a complete set of experimental data for 2SIGMA and 2PI vibronic levels of X(v1v20) 2PI NCO for v1 less-than-or-equal-to 2, v2 less-than-or-equal-to 4 and for the (010) 2DELTA vibronic states. A fairly complete effective Hamiltonian is described and the parameters in it are fitted to a sample representative of all these data. We successfully fit the data to close to the experimental measurement accuracy and derive a unique set of harmonic and anharmonic vibrational terms. The results are interpreted in terms of the electronic structure and vibrational potential energy surface of the radical. RP WU, M (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 32 TC 12 Z9 13 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD JUN 20 PY 1994 VL 82 IS 3 BP 503 EP 521 DI 10.1080/00268979400100374 PG 19 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NV134 UT WOS:A1994NV13400006 ER PT J AU WOZNY, CE SUMPTER, BG NOID, DW AF WOZNY, CE SUMPTER, BG NOID, DW TI DYNAMICAL ANALYSIS OF LINEAR-POLYMERS USING MODE-SPECIFIC TRAJECTORIES SO MOLECULAR PHYSICS LA English DT Article AB Recently, a new method was presented for calculating vibrational dispersion curves for linear polymers from the spectral analysis of molecular dynamics trajectories with random initial conditions. An alternative approach is to choose initial conditions for trajectories such that only one collective mode corresponding to a specific vibrational frequency and phase relationship is preferentially excited. As a result, for the first time all the standard techniques of nonlinear dynamics (Lissajous figures, surfaces of section, etc.) may be applied to the collective coordinates of a macromolecule. After demonstrating that approximate initial conditions will preferentially excite specific collective modes, improved dispersion curves for a 100 unit all-trans polyethylene chain are compared with the results of a normal coordinate analysis. The similarity of the phase space of collective modes and local modes is then shown through plots of Lissajous figures and surfaces of section for trajectories in which multiple collective modes are excited simultaneously. RP WOZNY, CE (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 19 TC 2 Z9 2 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD JUN 20 PY 1994 VL 82 IS 3 BP 597 EP 616 DI 10.1080/00268979400100434 PG 20 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NV134 UT WOS:A1994NV13400012 ER PT J AU NAKATSUKASA, T MATSUYANAGI, K HAMAMOTO, I NAZAREWICZ, W AF NAKATSUKASA, T MATSUYANAGI, K HAMAMOTO, I NAZAREWICZ, W TI LOW-ENERGY M1 AND E3 EXCITATIONS IN THE PROTON-RICH KR-ZR REGION SO NUCLEAR PHYSICS A LA English DT Article DE 76,78,80,82SR; 72,72,76,78,80KR; 80,82ZR; CALCULATED LEVELS; B(LAMBDA); QUASI-PARTICLE RPA ID SUPERDEFORMED ROTATIONAL BANDS; MAGNETIC DIPOLE STRENGTH; OCTUPOLE VIBRATIONS; PAIRING CORRELATIONS; DEFORMED-NUCLEI; DEFORMATION DEPENDENCE; MICROSCOPIC MODEL; SHAPE COEXISTENCE; KR-78; MASS AB Low-energy intrinsic K(pi) = 1+, 0-, 1-, 2-, and 3- states in the even-even proton-rich Sr, Kr, and Zr nuclei are investigated using the quasiparticle random-phase approximation. In the Z congruent-to N nuclei the lowest-lying 1+ states are found to carry unusually large B(M1) strength. It is demonstrated that, unlike in the heavier nuclei, the octupole collectivity in the light zirconium region is small and, thus, is not directly correlated with the systematics of the lowest negative-parity states. C1 OAK RIDGE NATL LAB, JOINT INST HEAVY ION RES, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. RP KYOTO UNIV, DEPT PHYS, KYOTO 60601, JAPAN. RI Nakatsukasa, Takashi/O-9995-2014 NR 53 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 20 PY 1994 VL 573 IS 3 BP 333 EP 355 DI 10.1016/0375-9474(94)90348-4 PG 23 WC Physics, Nuclear SC Physics GA NW044 UT WOS:A1994NW04400001 ER PT J AU CWIOK, S HOFMANN, S NAZAREWICZ, W AF CWIOK, S HOFMANN, S NAZAREWICZ, W TI SHELL STRUCTURE OF THE HEAVIEST ELEMENTS SO NUCLEAR PHYSICS A LA English DT Article DE Z = 95-111; N = 149-162; COMPILED; REVIEWED MASS EXCESS; EQUILIBRIUM DEFORMATIONS; SINGLE NUCLEON STATES BINDING ENERGY; Q(ALPHA) ID MULTIDIMENSIONAL DEFORMATION SPACE; NUCLEAR-MASS FORMULA; FISSION HALF-LIVES; SUPERHEAVY NUCLEI; POTENTIAL-ENERGY; ALPHA-DECAY; BARRIERS; ISOTOPES; MODEL; HEAVY AB The status of experimental and theoretical studies of the heaviest elements is reviewed. The single-particle structure of the heaviest nuclei with 95 less-than-or-equal-to Z less-than-or-equal-to 111 and 149 less-than-or-equal-to N less-than-or-equal-to 162 is investigated using the Nilsson-Strutinsky approach with an average Woods-Saxon potential and a monopole pairing residual interaction. Detailed analysis of shell effects, single-proton and -neutron states, equilibrium deformations, binding energies, and Q(alpha)-values, is given. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,DIV PHYS,OAK RIDGE,TN 37831. RP CWIOK, S (reprint author), GESELLSCH SCHWERIONENFORSCH,POB 110552,D-64220 DARMSTADT,GERMANY. NR 80 TC 154 Z9 156 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 JUN 20 PY 1994 VL 573 IS 3 BP 356 EP 394 DI 10.1016/0375-9474(94)90349-2 PG 39 WC Physics, Nuclear SC Physics GA NW044 UT WOS:A1994NW04400002 ER PT J AU CARLSON, KD KINI, AM SCHLUETER, JA WANG, HH SUTIN, JDB WILLIAMS, JM SCHIRBER, JE VENTURINI, EL BAYLESS, WR AF CARLSON, KD KINI, AM SCHLUETER, JA WANG, HH SUTIN, JDB WILLIAMS, JM SCHIRBER, JE VENTURINI, EL BAYLESS, WR TI THE ISOTOPE EFFECT FOR SUPERCONDUCTIVITY IN HIGH-T(C)BETA-ASTERISK-(ET)(2)I(3) WITH C-13 ISOTOPIC-SUBSTITUTION IN THE RING AND CENTRAL C=C ATOMS OF BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE (ET) SO PHYSICA C LA English DT Article ID ORGANIC SUPERCONDUCTOR; AMBIENT-PRESSURE; BEDT-TTF; KAPPA-(ET)2X SUPERCONDUCTORS; SYNTHETIC METALS; BETA-(BEDT-TTF)2I3; MECHANISM AB This article describes the first study of the superconducting isotope effect on T(c) for beta*-(ET)2I3 (also denoted as beta(H)-(ET)2I3), the crystallographically ordered form of beta-(ET)2I3 produced by application of a mild pressure, for C-13 substitution in both the ring and central double-bonded C=C atoms of the ET electron-donor molecule. A previous determination by others of this isotope effect for C-13 substitution only in the central C=C atoms gives DELTAT(c) = - 0.2+/-0.1 K, suggesting that the C=C stretching motions are of major importance as mediators of the superconducting pairing of charge carriers. This value of the isotope effect, if correct, would be expected to increase to -0.4 K with C-13 substitution in both the ring and central C=C atoms, giving a more decisive measure of the isotope effect. The present experiments, however, yield a zero isotope effect within an uncertainty of +/-0.1 K. This result indicates that the vibrational modes associated with the three C=C stretching motions do not provide a dominant exchange mechanism for Cooper pairing. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP CARLSON, KD (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 28 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 20 PY 1994 VL 227 IS 1-2 BP 10 EP 14 DI 10.1016/0921-4534(94)90350-6 PG 5 WC Physics, Applied SC Physics GA NV540 UT WOS:A1994NV54000002 ER PT J AU CHAKOUMAKOS, BC PARANTHAMAN, M AF CHAKOUMAKOS, BC PARANTHAMAN, M TI NEUTRON POWDER DIFFRACTION STUDY OF THE SUPERCONDUCTING QUATERNARY INTERMETALLIC COMPOUND YNI2B2C SO PHYSICA C LA English DT Article ID RAY AB The crystal structure of YNi2B2C has been refined at room temperature using powder neutron diffraction data obtained from samples prepared by arc-melting. The nominal composition YNi3B2.5C Yields a phase assemblage of principally 85 volume % YNi2B2C relative to Ni2B, and the YNi2.5B2C composition yields 93 volume % relative to 7 volume % Ni3B. YNi2B2C is apparently incongruently melting. The crystal structure is simply viewed as a ''stuffed'' derivative of the common layered ThCr2Si2- type structure, by inserting C atoms in the lanthanide (actinide) layer. Structural data for the most phase-pure title compound include: I4/mmm symmetry, a = 3.5257(1) angstrom, c = 10.5336(4) angstrom and x(B) = 0.3589(4). The atomic sites appear to be fully occupied, and there is no indication of B-Ni disorder. The arc-melted YNi3B2.5C (nominal) sample has a superconducting T(c) of 15.6 K, as defined by the onset of diamagnetism. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. 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 23 TC 33 Z9 33 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 20 PY 1994 VL 227 IS 1-2 BP 143 EP 150 DI 10.1016/0921-4534(94)90367-0 PG 8 WC Physics, Applied SC Physics GA NV540 UT WOS:A1994NV54000019 ER PT J AU BABCOCK, SE CAI, XY LARBALESTIER, DC SHIN, DH ZHANG, N ZHANG, H KAISER, DL GAO, YF AF BABCOCK, SE CAI, XY LARBALESTIER, DC SHIN, DH ZHANG, N ZHANG, H KAISER, DL GAO, YF TI A TEM-EELS STUDY OF HOLE CONCENTRATIONS NEAR STRONGLY AND WEAKLY COUPLED GRAIN-BOUNDARIES IN ELECTROMAGNETICALLY CHARACTERIZED YBA2CU3O7-DELTA BICRYSTALS SO PHYSICA C LA English DT Article ID TRANSMISSION ELECTRON-MICROSCOPE; THIN-FILMS; ATOMIC-STRUCTURE; SINGLE-CRYSTALS; OXYGEN; BEHAVIOR; SPECTROSCOPY; TRANSPORT; GROWTH AB High-spatial-resolution electron energy loss spectroscopy in a transmission electron microscope (TEM-EELS) was used to obtain hole-concentration profiles near grain boundaries in flux-grown YBa2Cu3O7-delta bicrystals with misorientation relationships of 7-degrees, 12-degrees, 28-degrees, and 31-degrees about their common [001 ] rotation axes. A key aspect of the work is that the electromagnetic properties and coupling character of each of the bicrystals also were determined explicitly. The 28-degrees and 31-degrees bicrystals showed Josephson-junction-like weak coupling and evidence for severe hole depletion at the boundary was present in the oxygen K near-edge fine structure (ELNES) of the EELS spectra obtained from them. The hole-deficient zone extended 20 to 40 nm into each crystal. In striking contrast, the 7-degrees and 12-degrees bicrystals were strongly coupled and dramatically less hole depleted at the grain boundary. These results show that the boundary region within which the electronic structure differs from that of the bulk is substantially wider than both the YBa2Cu3O7-delta coherence length and the grain-boundary structural and compositional width suggested by high-resolution TEM images and cation non-stoichiometry studies. They also suggest a continuous transition from strongly to weakly coupled character. C1 NORTHWESTERN UNIV,CTR SCI & TECHNOL,EVANSTON,IL 60208. NIST,DIV CERAM,GAITHERSBURG,MD 20899. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BABCOCK, SE (reprint author), UNIV WISCONSIN,CTR APPL SUPERCONDUCT,MADISON,WI 53706, USA. RI Larbalestier, David/B-2277-2008 OI Larbalestier, David/0000-0001-7098-7208 NR 46 TC 56 Z9 56 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 20 PY 1994 VL 227 IS 1-2 BP 183 EP 196 DI 10.1016/0921-4534(94)90372-7 PG 14 WC Physics, Applied SC Physics GA NV540 UT WOS:A1994NV54000024 ER PT J AU LEBRUN, T BERRY, HG CHENG, S DUNFORD, RW ESBENSEN, H GEMMELL, DS KANTER, EP BAUER, W AF LEBRUN, T BERRY, HG CHENG, S DUNFORD, RW ESBENSEN, H GEMMELL, DS KANTER, EP BAUER, W TI IONIZATION AND MULTIFRAGMENTATION OF C-60 BY HIGH-ENERGY, HIGHLY-CHARGED XE IONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEAR LATTICE MODEL; FRAGMENTATION REACTIONS; C-60; CARBON; PHOTOIONIZATION; CLUSTERS AB Ionization and multifragmentation have been observed in C60 molecules bombarded by Xe35+ and Xe18+ ions with energies in the range 420-625 MeV. The c.m. energies exceeded those used in previous studies by several orders of magnitude. We present the observed mass distribution of positively charged fragments together with a theoretical model indicating that the total interaction cross section contains roughly equal contributions from (a) excitation of the giant plasmon resonance, and (b) large-energy-transfer processes that lead to multiple fragmentation of the molecule C1 MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824. RP LEBRUN, T (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 22 TC 135 Z9 135 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 JUN 20 PY 1994 VL 72 IS 25 BP 3965 EP 3968 DI 10.1103/PhysRevLett.72.3965 PG 4 WC Physics, Multidisciplinary SC Physics GA NT205 UT WOS:A1994NT20500012 ER PT J AU OKAMOTO, H SESSLER, AM MOHL, D AF OKAMOTO, H SESSLER, AM MOHL, D TI 3-DIMENSIONAL LASER COOLING OF STORED AND CIRCULATING ION-BEAMS BY MEANS OF A COUPLING CAVITY SO PHYSICAL REVIEW LETTERS LA English DT Article AB It is shown theoretically that a coupling cavity (namely, an rf cavity operating in the TM210 mode) inserted into a storage ring will enhance the coupling between longitudinal and transverse degrees of freedom. As a result, the demonstrated very effective laser cooling of the longitudinal motion can now be extended to transverse motion; i.e., employed to cool a beam in all three directions. C1 CERN PS,CH-1211 GENEVA 23,SWITZERLAND. RP OKAMOTO, H (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 9 TC 51 Z9 51 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 JUN 20 PY 1994 VL 72 IS 25 BP 3977 EP 3980 DI 10.1103/PhysRevLett.72.3977 PG 4 WC Physics, Multidisciplinary SC Physics GA NT205 UT WOS:A1994NT20500015 ER PT J AU MANKO, OV YEH, LW AF MANKO, OV YEH, LW TI CORRELATED SQUEEZED STATES OF 2 COUPLED OSCILLATORS WITH DELTA-KICKED FREQUENCIES SO PHYSICS LETTERS A LA English DT Article ID QUANTUM; GENERATION AB The squeezing phenomenon due to parametric excitations in a system of two coupled harmonic oscillators with delta-kicked frequencies is investigated. The covariance matrix of the correlated squeezed states generated in this system is calculated explicitly using the phase-space approach. C1 LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP MANKO, OV (reprint author), RUSSIAN ACAD SCI,LEBEDEV PHYS INST,LENINSKY PROSPEKT 53,MOSCOW 117924,RUSSIA. RI Manko, Olga/M-4710-2015 NR 23 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD JUN 20 PY 1994 VL 189 IS 4 BP 268 EP 276 DI 10.1016/0375-9601(94)90095-7 PG 9 WC Physics, Multidisciplinary SC Physics GA NT006 UT WOS:A1994NT00600002 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI DIFFUSION BARRIER FOR A AG ADATOM ON PT(111) SO SURFACE SCIENCE LA English DT Letter ID EMBEDDED-ATOM-METHOD; SURFACES; PSEUDOPOTENTIALS; METALS AB First-principles local density functional (FP-LDF) calculations for a single Ag atom adsorbed on Pt(111) are compared to scanning tunneling microscope (STM) observations of Brune et al. and to embedded atom method (EAM) results of Blandin and Massobrio. The EAM calculations predict a small static diffusion barrier, 0.05 eV which corresponds poorly to the result of the FP-LDF calculation, 0.20 eV. The STM measurements yield a diffusion barrier of 0.16 +/- 0.01 eV. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 22 TC 33 Z9 34 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 20 PY 1994 VL 313 IS 1-2 BP L801 EP L805 DI 10.1016/0039-6028(94)91149-5 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NT053 UT WOS:A1994NT05300005 ER PT J AU CHANG, TC CHIANG, CC SMALL, GJ CHOU, SH AF CHANG, TC CHIANG, CC SMALL, GJ CHOU, SH TI THERMAL RECOVERY OF SPECTRAL HOLES OF DYE MOLECULES IN POLYMER-FILMS - SITE DISTRIBUTION IN 2-LEVEL SYSTEMS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID LOW-TEMPERATURE GLASSES; RELAXATION PROCESSES; PHOTOCHEMICAL HOLES; AMORPHOUS SYSTEMS; ORGANIC GLASSES; PHOTON-ECHO; STATE; DYNAMICS; SOLIDS AB We have measured the temperature-annealing and the temperature-cycling hole-burning spectra of 5-(and 6-)carboxy-X-rhodamine-N-hydroxy-succinimidyl ester doped in polyvinyl alcohol films. The difference of the reduction of zero-phonon hole between annealing and cycling spectra can be described by the linear electron-phonon coupling, which provides the information of site distribution of asymmetric energy. C1 NATL TAIWAN UNIV,DEPT CHEM,TAIPEI,TAIWAN. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP CHANG, TC (reprint author), ACAD SINICA,INST ATOM & MOLEC SCI,POB 23-166,TAIPEI 10764,TAIWAN. RI Chang, Ta-Chau/F-7921-2012 NR 30 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 17 PY 1994 VL 223 IS 3 BP 190 EP 196 DI 10.1016/0009-2614(94)00436-6 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NQ825 UT WOS:A1994NQ82500010 ER PT J AU MOROZOV, VE FALZON, M ANDERSON, CW KUFF, EL AF MOROZOV, VE FALZON, M ANDERSON, CW KUFF, EL TI DNA-DEPENDENT PROTEIN-KINASE IS ACTIVATED BY NICKS AND LARGER SINGLE-STRANDED GAPS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID RNA POLYMERASE-II; TERMINAL TRANSACTIVATION DOMAIN; VIRUS-40 T-ANTIGEN; KU PROTEIN; CELL-CYCLE; HUMAN P53; PHOSPHORYLATION; BINDING; AUTOANTIGEN; EBP-80 AB DNA-PK is a DNA-activated serine/threonine protein kinase capable of phosphorylating a number of nuclear DNA-binding proteins. Purified human DNA-PK has two subunits, a 350-kDa polypeptide, Prkdc, which binds ATP and is presumed to contain the catalytic site, and the Ku autoantigen which mediates DNA binding and activation. Previous studies have shown that DNA-PK is activated in vitro by linear double-stranded DNA fragments; however, the Ku subunit binds a broader range of DNA structures. Here we show that EBP-80, a protein originally isolated as a transcription factor for a retroviral long terminal repeat element and subsequently found to be similar to if not identical with Ku, also mediates kinase activation. The EBP-80-Prkdc complex is activated by nanomolar concentrations of DNA constructs containing single-to-double strand transitions, including a closed stem-loop structure and single strand gaps of 0 (nick), 6, and 30 nucleotides. Kinase activation parallels the ability of EBP-80 to bind these and other constructs. Our results extend the range of DNA configurations known to activate DNA-PK and are consistent with the participation of this enzyme complex in several nuclear functions. C1 NCI,BIOCHEM LAB,BETHESDA,MD 20892. UNIV TEXAS,DEPT PHARMACOL & TOXICOL,GALVESTON,TX 77555. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 34 TC 131 Z9 132 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 JUN 17 PY 1994 VL 269 IS 24 BP 16684 EP 16688 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NR296 UT WOS:A1994NR29600028 PM 8206988 ER PT J AU GERMANN, GJ RAKESTRAW, DJ AF GERMANN, GJ RAKESTRAW, DJ TI MULTIPLEX SPECTROSCOPY - DETERMINING THE TRANSITION MOMENTS AND ABSOLUTE CONCENTRATIONS OF MOLECULAR-SPECIES SO SCIENCE LA English DT Article ID FUNDAMENTAL BANDS; INTENSITIES; HCL; HF AB A procedure is described that uses two spectroscopic techniques, absorption and infrared degenerate four-wave mixing, in tandem (multiplex) to measure the transition dipole moments and absolute concentrations of molecular species in situ. The method is demonstrated by the measurement of the relative transition moments and concentrations of two dissimilar sample gas components, hydrogen chloride and nitrogen dioxide, but is applicable to a wide variety of molecules and, thus, can provide new information for transient molecular species. Further, difficulties in obtaining quantitative information through techniques such as laser-induced fluorescence, coherent antiStokes Raman scattering, and degenerate four-wave mixing spectroscopies can be overcome when a multiplex approach is used. RP GERMANN, GJ (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550, USA. NR 15 TC 22 Z9 22 U1 0 U2 7 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 17 PY 1994 VL 264 IS 5166 BP 1750 EP 1753 DI 10.1126/science.264.5166.1750 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NR600 UT WOS:A1994NR60000039 PM 17839910 ER PT J AU GIBSON, JK AF GIBSON, JK TI CLUSTERS FORMED DIRECTLY FROM LASER-ABLATION OF YTTERBIUM OXIDE - YB3O4+ AND YB6O8+ SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VAPORIZATION; VALENCE AB Excimer laser (X = 308 nm) ablation of solid Yb2O3 into vacuum has been found to generate polyatomic ytterbium oxide ions: Yb-2(+), Yb2O+, Yb2O2+, Yb304+, and Yb6O8+. In contrast, other Ln(2)O(3) (Ln = Sm, Eu, Gd, Dy) formed observable amounts of only the atomic and/or monoxide ions, Ln(+) and LnO(+). The stoichiometry of Yb6O8+ suggests mixed-valence Yb-II/III content. The vapor composition found for vacuum ablation of Yb2O3 differs notably from both that reported for equilibrium vaporization of Yb2O3 and that for reactive (with O-2) condensation of ablated ytterbium metal. RP GIBSON, JK (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 21 Z9 21 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 JUN 16 PY 1994 VL 98 IS 24 BP 6063 EP 6067 DI 10.1021/j100075a004 PG 5 WC Chemistry, Physical SC Chemistry GA NT180 UT WOS:A1994NT18000004 ER PT J AU JANATA, J JOSOWICZ, M DEVANEY, DM AF JANATA, J JOSOWICZ, M DEVANEY, DM TI CHEMICAL SENSORS SO ANALYTICAL CHEMISTRY LA English DT Review ID ION-SELECTIVE ELECTRODES; SURFACE-PLASMON RESONANCE; LANGMUIR-BLODGETT-FILMS; ACOUSTIC-WAVE SENSOR; FIBER OPTIC SENSOR; QUARTZ-CRYSTAL MICROBALANCE; FIELD-EFFECT TRANSISTORS; CARBON-DIOXIDE SENSOR; COMPOSITE THIN-FILMS; NICOTINAMIDE ADENINE-DINUCLEOTIDE C1 UNIV UTAH, DEPT MAT SCI & ENGN, SALT LAKE CITY, UT 84112 USA. RP JANATA, J (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, ENVIRONM & MOLEC SCI LAB GRP, RICHLAND, WA 99352 USA. NR 793 TC 212 Z9 213 U1 5 U2 34 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD JUN 15 PY 1994 VL 66 IS 12 BP R207 EP R228 PG 22 WC Chemistry, Analytical SC Chemistry GA NR444 UT WOS:A1994NR44400010 PM 8092466 ER PT J AU MARCOCCI, L MAGUIRE, JJ DROYLEFAIX, MT PACKER, L AF MARCOCCI, L MAGUIRE, JJ DROYLEFAIX, MT PACKER, L TI THE NITRIC OXIDE-SCAVENGING PROPERTIES OF GINKGO-BILOBA EXTRACT EGB-761 SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID RELAXING FACTOR; GUANYLATE-CYCLASE; SUPEROXIDE-DISMUTASE; INHIBITION; ANION; CELLS; RELAXATION; ACTIVATION; HEMOGLOBIN; OXIDATION AB Ginkgo biloba extract EGb 761 was found to be a scavenger of nitric oxide in in vitro acellular systems, under physiological conditions. EGb 761 competed with oxyhemoglobin for reaction with nitric oxide generated during the interaction Complex I of catalase. An EGb 761 dose-dependent decrease formed in the reaction of oxygen with nitric oxide produced from nitroprusside was also observed. These data implicate it as a potential therapeutic conditions of altered production of nitric oxide. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. IPSEN,F-75016 PARIS,FRANCE. NR 40 TC 377 Z9 399 U1 0 U2 15 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD JUN 15 PY 1994 VL 201 IS 2 BP 748 EP 755 DI 10.1006/bbrc.1994.1764 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NQ805 UT WOS:A1994NQ80500037 PM 8003011 ER PT J AU LEVIN, J EBBE, S AF LEVIN, J EBBE, S TI WHY ARE RECENTLY PUBLISHED PLATELET COUNTS IN NORMAL MICE SO LOW SO BLOOD LA English DT Letter ID AZIDOTHYMIDINE TREATMENT; MEGAKARYOCYTOPOIESIS; THROMBOCYTOPENIA; ERYTHROPOIETIN; VOLUME; MODEL C1 LAWRENCE BERKELEY LAB,BERKELEY,CA. RP LEVIN, J (reprint author), VET ADM MED CTR,SAN FRANCISCO,CA 94121, USA. NR 13 TC 14 Z9 15 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD JUN 15 PY 1994 VL 83 IS 12 BP 3829 EP 3830 PG 2 WC Hematology SC Hematology GA NR905 UT WOS:A1994NR90500052 PM 8204902 ER PT J AU TANG, J AF TANG, J TI SEQUENTIAL AND SUPEREXCHANGE ELECTRON-TRANSFER REACTIONS IN A 3-COMPONENT SYSTEM SO CHEMICAL PHYSICS LA English DT Article ID PRIMARY CHARGE-SEPARATION; NONSUPEREXCHANGE COHERENT MECHANISM; BACTERIAL PHOTOSYNTHESIS; REACTION CENTERS; POLAR-SOLVENTS; DIELECTRIC FRICTION; SOLVATION DYNAMICS; LIOUVILLE-SPACE; KINETICS; SPECTROSCOPY AB A theory for sequential and superexchange electron-transfer reactions at high temperature is presented for a three-component system consisting of a donor, a distant acceptor, and a bridging intermediate. Analytical expressions for these electron-transfer rate constants are derived using the stochastic Liouville equation of Zusman for a Debye solvent. Two extremes are considered: (1) the nondegenerate case where the direct vertical energy gap between the donor and the intermediate is large and three energy-level crossing points are far apart; (2) the degenerate case where the direct vertical energy gap vanishes. 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 36 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD JUN 15 PY 1994 VL 184 IS 1-3 BP 39 EP 50 DI 10.1016/0301-0104(94)00072-7 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NU731 UT WOS:A1994NU73100004 ER PT J AU PALMER, BJ AF PALMER, BJ TI A SMOOTH TRUNCATION FOR POLARIZABLE WATER SO CHEMICAL PHYSICS LA English DT Article ID TEMPERATURE MOLECULAR-DYNAMICS; LIQUID WATER; SIMULATIONS; FORMULATION; SYSTEMS AB A systematic approach to smoothly truncating the Coulomb interaction in systems containing polarizable centers is presented and applied to the revised POLI model of water. The truncation leads to energy conserving trajectories without severly distorting the properties of the original model. Equilibrium properties and the diffusion constant are reported for the truncated POL1 model. RP PACIFIC NW LAB, DEPT ANALYT SCI, RICHLAND, WA 99352 USA. NR 24 TC 3 Z9 3 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 JUN 15 PY 1994 VL 184 IS 1-3 BP 163 EP 169 DI 10.1016/0301-0104(94)00088-3 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NU731 UT WOS:A1994NU73100015 ER PT J AU WURZ, P LYKKE, KR AF WURZ, P LYKKE, KR TI KINETICS OF MULTIPHOTON EXCITATION AND FRAGMENTATION OF C-60 SO CHEMICAL PHYSICS LA English DT Article ID CARBON CLUSTER IONS; THERMIONIC EMISSION; BUCKMINSTERFULLERENE; IONIZATION; C60; DISSOCIATION; SEPARATION; PHOTODISSOCIATION; FULLERENES; RINGS AB We report experimental and theoretical results on the kinetics of multiphoton excitation and fragmentation patterns due to UV-laser excitation of C60. Multiphoton excitation of C60 is modeled including singlet and triplet states. Results show that a many-photon excitation event can have a low-order dependence on the laser fluence. In addition, we show why femtosecond excitation or nanosecond excitation with wavelengths shorter than approximately 215 nm can yield direct ionization without fragmentation or delayed ionization. The fragmentation is modeled by a total rate theory. Interpretation of the measured fragmentation data is in terms of sequential evaporation Of C2 units from the highly excited C60 and subsequent fragments. Larger C(n) units may contribute approximately 5 to 10% to the fragmentation pattern. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP WURZ, P (reprint author), UNIV BERN,INST PHYS,SIDLERSTR 5,CH-3012 BERN,SWITZERLAND. NR 37 TC 41 Z9 41 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 JUN 15 PY 1994 VL 184 IS 1-3 BP 335 EP 346 DI 10.1016/0301-0104(94)00087-5 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NU731 UT WOS:A1994NU73100029 ER PT J AU MICHAUD, EJ VANVUGT, MJ BULTMAN, SJ SWEET, HO DAVISSON, MT WOYCHIK, RP AF MICHAUD, EJ VANVUGT, MJ BULTMAN, SJ SWEET, HO DAVISSON, MT WOYCHIK, RP TI DIFFERENTIAL EXPRESSION OF A NEW DOMINANT AGOUTI ALLELE (A(IAPY)) IS CORRELATED WITH METHYLATION STATE AND IS INFLUENCED BY PARENTAL LINEAGE SO GENES & DEVELOPMENT LA English DT Article DE AGOUTI; SPONTANEOUS MUTATION; INTRACISTERNAL A-PARTICLE YELLOW (A(IAPY)); CPG METHYLATION; DIFFERENTIAL GENE EXPRESSION ID INTRACISTERNAL-A-PARTICLE; LONG TERMINAL REPEATS; DETERMINES METHYLATION; SEQUENCE-ANALYSIS; BINDING PROTEIN; HOMEOBOX GENE; MOUSE; MICE; TRANSCRIPTION; PROMOTER AB The agouti gene normally confers the wild-type coat color of mice. Dominant mutations at the agouti locus result in a pleiotropic syndrome that is characterized by excessive amounts of yellow pigment in the coat, obesity, a non-insulin-dependent diabetic-like condition, and the propensity to form a variety of tumors. Here, we describe a new dominant mutation at the agouti locus in which an intracisternal A-particle (IAP) has integrated in an antisense orientation immediately 5' of the first coding exon of the gene. This mutation, which we have named A(iapy), results in the ectopic expression of the agouti gene through the utilization of a cryptic promoter within the IAP 5' long terminal repeat (LTR). The coat color of A(iapy/)- mice ranges from solid yellow to a pigment pattern that is similar to wild type (pseudoagouti), and the expressivity of this mutant phenotype varies with parental inheritance. Those offspring with a yellow coat ectopically express agouti mRNA at high levels and exhibit marked obesity, whereas pseudoagouti mice express agouti mRNA at a very low level and their weights do not differ from wild-type littermates. Data are presented to show that the differential expressivity of the A(iapy) allele is correlated with the methylation status of the inserted IAP 5' LTR. These data further support the hypothesis that in dominant yellow mutations at the agouti locus, it is the ubiquitous expression of the wild-type agouti coding sequence that is responsible for the yellow coat color, obesity, diabetes, and tumorigenesis. C1 AGR UNIV WAGENINGEN, DEPT GENET, 6703 HA WAGENINGEN, NETHERLANDS. UNIV TENNESSEE, GRAD SCH BIOMED SCI, OAK RIDGE, TN 37831 USA. JACKSON LAB, BAR HARBOR, ME 04609 USA. RP OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. FU NIEHS NIH HHS [IAG 222Y01-ES-10067] NR 41 TC 187 Z9 189 U1 1 U2 9 PU COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT PI COLD SPRING HARBOR PA 1 BUNGTOWN RD, COLD SPRING HARBOR, NY 11724 USA SN 0890-9369 EI 1549-5477 J9 GENE DEV JI Genes Dev. PD JUN 15 PY 1994 VL 8 IS 12 BP 1463 EP 1472 DI 10.1101/gad.8.12.1463 PG 10 WC Cell Biology; Developmental Biology; Genetics & Heredity SC Cell Biology; Developmental Biology; Genetics & Heredity GA NU353 UT WOS:A1994NU35300009 PM 7926745 ER PT J AU PHILLIPS, JL BALOGH, A BAME, SJ GOLDSTEIN, BE GOSLING, JT HOEKSEMA, JT MCCOMAS, DJ NEUGEBAUER, M SHEELEY, NR WANG, YM AF PHILLIPS, JL BALOGH, A BAME, SJ GOLDSTEIN, BE GOSLING, JT HOEKSEMA, JT MCCOMAS, DJ NEUGEBAUER, M SHEELEY, NR WANG, YM TI ULYSSES AT 50-DEGREES SOUTH - CONSTANT IMMERSION IN THE HIGH-SPEED SOLAR-WIND SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID HELIOSPHERIC CURRENT SHEET; SECTOR STRUCTURE; EVOLUTION; CYCLE AB We present speed observations from the Ulysses solar wind plasma experiment through 50-degrees south latitude. The pronounced speed modulation arising from solar rotation and the tilt of the heliomagnetic current sheet has nearly disappeared. Ulysses is now observing wind speeds in the 700 to 800 km s-1 range, with a magnetic polarity indicating an origin in the large south polar coronal hole. The strong compressions, rarefactions, and shock waves previously seen have weakened or disappeared. Occasional coronal mass ejections characterized by low plasma density caused by radial expansion have been observed. The coronal configuration was simple and stable in 1993, indicating that the observed solar wind changes were caused by increasing spacecraft latitude. Trends in prevailing speed with increasing latitude support previous findings. A decrease in peak speed southward of 40-degrees latitude may indicate that the fastest solar wind comes from the equatorial extensions of the polar coronal holes. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. JET PROP LAB,PASADENA,CA 91109. STANFORD UNIV,ERL 322 CSSA,STANFORD,CA 94305. USN,RES LAB,CODE 7672,WASHINGTON,DC 20375. RP PHILLIPS, JL (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 16 TC 98 Z9 98 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 JUN 15 PY 1994 VL 21 IS 12 BP 1105 EP 1108 DI 10.1029/94GL01065 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NT217 UT WOS:A1994NT21700002 ER PT J AU GOSLING, JT BAME, SJ MCCOMAS, DJ PHILLIPS, JL GOLDSTEIN, BE NEUGEBAUER, M AF GOSLING, JT BAME, SJ MCCOMAS, DJ PHILLIPS, JL GOLDSTEIN, BE NEUGEBAUER, M TI THE SPEEDS OF CORONAL MASS EJECTIONS IN THE SOLAR-WIND AT MID HELIOGRAPHIC LATITUDES - ULYSSES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID ELECTRON EVENTS AB Six CMEs have been detected in the Ulysses plasma observations poleward of S31-degrees. The most striking aspect of these mid-latitude CMEs was their high speeds; the overall average speed of these CMEs was -740 km s-1, which was comparable to that of the rest of the solar wind at these latitudes. This average CME speed is much higher than average CME speeds observed in the solar wind in the ecliptic or in the corona close to the Sun. The evidence indicates that the CMEs were not pushed up to high speeds in interplanetary space by interaction with trailing high-speed plasma. Rather, they simply seem to have received the same basic acceleration as the rest of the solar wind at these mid-latitudes. Our results suggest that the basic acceleration process for many CMEs at all latitudes is essentially the same as for the normal solar wind. Frequently most of this acceleration must occur well beyond 6 solar radii from Sun center. C1 JET PROP LAB,PASADENA,CA 91109. RP GOSLING, JT (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 18 TC 31 Z9 31 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 JUN 15 PY 1994 VL 21 IS 12 BP 1109 EP 1112 DI 10.1029/94GL01068 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NT217 UT WOS:A1994NT21700003 ER PT J AU MCCLELLAND, MA AF MCCLELLAND, MA TI APPLICATION OF STREAMWISE DIFFUSION TO TIME-DEPENDENT FREE-CONVECTION OF LIQUID-METALS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE STREAMWISE DIFFUSION; TAYLOR GALERKIN METHOD; FINITE ELEMENT METHOD; FREE CONVECTION; LIQUID METALS ID HORIZONTAL BRIDGMAN GROWTH; NUMERICAL-SIMULATION; FLOW AB A numerical analysis is given for the application of streamwise diffusion to high-intensity flows with marginal spatial resolution. Terms are added to the momentum equation which are similar to those used in the Petrov-Galerkin, Taylor-Galerkin and balancing tensor diffusivity methods. Values for the streamwise viscosity are obtained from mesh refinement studies. An illustration is given for the time-dependent free convection of a liquid metal in a cavity with differentially heated sided walls. The spatial problem is solved with the Galerkin finite element method and the time integration is performed with the backward Euler method. Solution quality and computation time are compared for results with and without added streamwise diffusion. For the cases presented, streamwise diffusion eliminates spurious oscillations and saves computation time without compromising the solution. RP MCCLELLAND, MA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 0 Z9 0 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD JUN 15 PY 1994 VL 18 IS 11 BP 1061 EP 1071 DI 10.1002/fld.1650181104 PG 11 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA NQ030 UT WOS:A1994NQ03000003 ER PT J AU SHA, MC LI, Z BRADT, RC AF SHA, MC LI, Z BRADT, RC TI SINGLE-CRYSTAL ELASTIC-CONSTANTS OF FLUORAPTITE, CA5F (PO4)3 SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The single-crystal elastic stiffnesses of fluorapatite, Ca5F(PO4)3, have been measured by an ultrasonic technique. The values are: C-11=152.0, C-12=49.99, C-13=63.11, C33=185.7, and C44 = 42.75 GPa. These results are compared with previously published values to resolve anisotropy contradictions and differences in-magnitude. The apatite crystal structure is not very elastically anisotropic. It suggests that the elastic anisotropy of bone derives primarily from the hierarchical microstructure of that biocomposite and not from the anisotropy contribution of the apatite mineral component. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV NEVADA,MACKAY SCH MINES,RENO,NV 89557. NR 20 TC 32 Z9 33 U1 0 U2 7 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 JUN 15 PY 1994 VL 75 IS 12 BP 7784 EP 7787 DI 10.1063/1.357030 PG 4 WC Physics, Applied SC Physics GA NQ986 UT WOS:A1994NQ98600022 ER PT J AU BOWLER, JR NORTON, SJ HARRISON, DJ AF BOWLER, JR NORTON, SJ HARRISON, DJ TI EDDY-CURRENT INTERACTION WITH AN IDEAL CRACK .2. THE INVERSE PROBLEM SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Eddy-current inversion is the process whereby the geometry of a flaw in a metal is derived from electromagnetic probe measurements. An inversion scheme is described for finding the shape and size of cracks from eddy-current probe impedance measurements. The approach is based on an optimization scheme that seeks to minimize a global error function quantifying the difference between predicted and observed probe impedances. The error minimum is sought using a standard descent algorithm that requires a knowledge of the gradient of the error with respect to a variation of the flaw geometry. Computation of the gradient is based on a provisional flaw estimate, then the flaw estimate is updated in a ''direction'' that reduces the error. The process continues iteratively until a convergence criterion has been satisfied. Then the final flaw estimate should match the shape of the real defect. An equation for the gradient has been derived using an integral formulation of the ideal crack problem. Numerical estimates of the error gradient and the probe impedances have been calculated using approximations based on the moment method. Tests of the inversion scheme using single frequency probe impedance measurements have been carried out by calculating the shapes of narrow slots in aluminum alloy plates. Good agreement is found between the optimum profiles and the measured slot shapes. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. DEF RES AGCY,DEPT MAT & STRUCT,FARNBOROUGH GU14 6TD,HANTS,ENGLAND. RP BOWLER, JR (reprint author), UNIV SURREY,GUILDFORD GU2 5XH,SURREY,ENGLAND. RI Bowler, John/J-8955-2012 NR 6 TC 35 Z9 36 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1994 VL 75 IS 12 BP 8138 EP 8144 DI 10.1063/1.356512 PG 7 WC Physics, Applied SC Physics GA NQ986 UT WOS:A1994NQ98600079 ER PT J AU KIM, DH GRAY, KE HETTINGER, JD KANG, JH CHOI, SS AF KIM, DH GRAY, KE HETTINGER, JD KANG, JH CHOI, SS TI RESISTIVE MEASUREMENT OF THE TEMPERATURE-DEPENDENCE OF THE PENETRATION DEPTH OF NB IN NB/ALOX/NB JOSEPHSON-JUNCTIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MAGNETIC-FIELD PENETRATION; SUPERCONDUCTING THIN-FILMS; NIOBIUM AB The temperature dependence of the penetration depth of Nb films was determined from resistive transitions of Nb/AlO(x)/Nb Josephson junctions in a constant magnetic field applied parallel to the junction planes. Distinct resistance peaks were observed as temperature decreases and those peaks were found to appear when the total flux threading the junction equals an integral multiple of the flux quantum. From this condition, the penetration depth at those peak positions has been determined. The temperature dependence was well described by either the dirty local limit or the two-fluid model. This method can be useful for a highly fluctuating system such as high-temperature superconductors. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. WESTINGHOUSE SCI & TECHNOL CTR, PITTSBURGH, PA 15235 USA. RP KOREA INST SCI & TECHNOL, SEOUL 130650, SOUTH KOREA. NR 22 TC 3 Z9 3 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1994 VL 75 IS 12 BP 8163 EP 8167 DI 10.1063/1.356515 PG 5 WC Physics, Applied SC Physics GA NQ986 UT WOS:A1994NQ98600083 ER PT J AU NOLTE, J TEMPS, F WAGNER, HG WOLF, M SEARS, TJ AF NOLTE, J TEMPS, F WAGNER, HG WOLF, M SEARS, TJ TI FAR INFRARED-LASER MAGNETIC-RESONANCE DETECTION OF CHD ((X)OVER-TILDE (3)A'') SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ASYMMETRIC-TOP MOLECULES; ROTATIONAL SPECTRUM; LMR-SPECTROMETER; RATE-CONSTANT; SPECTROSCOPY; METHYLENE; HYDROCARBONS; KINETICS; RADICALS; FLOW AB Far infrared laser magnetic resonance (FIR-LMR) spectra of the CHD radical in its (X) over tilde(3)A'' electronic ground state were observed and assigned. The radicals were generated in the reaction of Na atoms with CHDBr2. LMR spectra were observed using seven laser lines at wavelengths around 100 to 200 mu m. The spectra were assigned to six different rotational transitions and the molecular parameters of CHD were determined by a least squares fit. A number of additional transitions, observed using a laser line at lambda=184.3 mu m but not yet assigned in detail, were attributed to a coupling between the accidentally almost degenerate N-KaKc=5(05) and 4(13) rotational levels induced by the epsilon(ab) term in the spin-rotation Hamiltonian and by the off-diagonal components of the hyperfine coupling tenser. C1 MAX PLANCK INST STROMUNGSFORSCH,D-37073 GOTTINGEN,GERMANY. BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 32 TC 6 Z9 6 U1 1 U2 3 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 JUN 15 PY 1994 VL 100 IS 12 BP 8706 EP 8712 DI 10.1063/1.466726 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NR284 UT WOS:A1994NR28400016 ER PT J AU PARR, AC DEHMER, PM DEHMER, JL UEDA, K WEST, JB SIGGEL, MRF HAYES, MA AF PARR, AC DEHMER, PM DEHMER, JL UEDA, K WEST, JB SIGGEL, MRF HAYES, MA TI SELECTIVE-POPULATION OF SPIN-ORBIT LEVELS IN THE AUTOIONIZATION OF A POLYATOMIC MOLECULE - BRANCHING RATIOS AND ASYMMETRY PARAMETERS FOR THE TANAKA-OGAWA RYDBERG SERIES IN CO2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RESOLVED PHOTOELECTRON-SPECTROSCOPY; CARBON-DIOXIDE; 2-PHOTON ABSORPTION; CROSS-SECTIONS; SYNCHROTRON RADIATION; PHOTO-IONIZATION; POLARIZATION DEPENDENCE; THRESHOLD PHOTOELECTRON; TRIATOMIC-MOLECULES; LINEAR-MOLECULES AB The spin-orbit selectivity of angle-resolved photoelectron spectra was used to provide new information on the electronic structure, symmetry, and decay dynamics of members of the autoionizing Tanaka-Ogawa Rydberg series in CO2. This represents the first time that spin-orbit selectivity has been used to obtain such information for a polyatomic molecule. The spin-orbit photoelectron branching ratios were used to show that the angular momentum quantum number lambda of the excited Rydberg electron does not change upon autoionization. Furthermore, a consideration of the present results together with previous calculations of the relative intensities of the discrete and continuum ionization channels shows that the most probable electron configuration for the Tanaka-Ogawa Rydberg series is...(pi(u))(3)(pi(g))(4)nd delta(g) and that autoionization proceeds primarily via a d delta g-->epsilon f delta(u), process for the totally symmetric vibronic components of the ion. The asymmetry parameter beta was determined for individual spin-orbit components of the various vibronic bands of the (X) over tilde (2) Pi(g) state and is discussed in terms of recent theoretical calculations. The Rydberg series appears to be well described by Omega(c) omega coupling, even for relatively low principal quantum numbers. The general utility of this technique for autoionizing Rydberg states and its extension to multiphoton ionization of Rydberg states that lie below the first ionization threshold are discussed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. TOHOKU UNIV,SCI MEASUREMENTS RES INST,SENDAI,MIYAGI 980,JAPAN. RP PARR, AC (reprint author), NIST,GAITHERSBURG,MD 20899, USA. NR 87 TC 12 Z9 12 U1 0 U2 3 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 JUN 15 PY 1994 VL 100 IS 12 BP 8768 EP 8779 DI 10.1063/1.466731 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NR284 UT WOS:A1994NR28400022 ER PT J AU DANG, LX AF DANG, LX TI POTENTIAL OF MEAN FORCE FOR THE METHANE-METHANE PAIR IN WATER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS; COMPUTER-SIMULATION; ASSOCIATION; HYDRATION; ENTROPY AB Molecular dynamics and potential of mean force techniques are used to study methane-methane association in water. The five-site, methane-methane pair potential is taken from recent work by Spellmeyer and Kollman, while the extended simple point charge model is used to model the water-water interactions. The calculated potentials of mean force at 300 and 330 K indicate that the contact wells are significantly deeper than the corresponding solvent-separated wells. The effect of the temperature on the calculated potential of mean force is found to be small. The calculated equilibrium constants suggest that the probability of contact and the solvent-separated pairs are comparable. The shape of our potential of mean force result at room temperature using the extended simple point charge model is very similar to the results of simulations reported by Belie and Wodak using a polarizable water model. It appears that further research is necessary to assess the role of nonadditive effects in modeling of hydrophobic interactions. RP DANG, LX (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 21 TC 60 Z9 61 U1 1 U2 8 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 JUN 15 PY 1994 VL 100 IS 12 BP 9032 EP 9034 DI 10.1063/1.466708 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NR284 UT WOS:A1994NR28400052 ER PT J AU JUNG, JK JHON, MS REE, FH AF JUNG, JK JHON, MS REE, FH TI AN ANALYTIC EQUATION OF STATE AND STRUCTURAL-PROPERTIES OF NONADDITIVE HARD-SPHERE MIXTURES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NON-ADDITIVE DIAMETERS; SCALED PARTICLE THEORY; NA-CS ALLOYS; INTEGRAL-EQUATION; PHASE-SEPARATION; BINARY MIXTURE; SIMPLE LIQUIDS; FLUIDS; EQUILIBRIUM; SYSTEM AB We present a new analytic fluid-phase equation of state (EOS) of binary nonadditive hard sphere mixtures having equal collision diameters (d(11)=d(22)=d) between like species, but having an unequal collision diameter (d(12)) between unlike species. For this purpose, we have generated EOS data by Monte Carlo simulations over a wide range of density, composition, and d(12) The analytic EOS produces reliable results for d(12)greater than or equal to d and d(12)d. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP JUNG, JK (reprint author), KOREA ADV INST SCI & TECHNOL,DEPT CHEM,TAEJON 305701,SOUTH KOREA. NR 42 TC 30 Z9 30 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 JUN 15 PY 1994 VL 100 IS 12 BP 9064 EP 9074 DI 10.1063/1.466712 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NR284 UT WOS:A1994NR28400056 ER PT J AU MARCUS, AH FAYER, MD CURRO, JG AF MARCUS, AH FAYER, MD CURRO, JG TI INTERMOLECULAR STRUCTURE IN A SINGLE-COMPONENT POLYMER GLASS - TOWARDS HIGH-RESOLUTION MEASUREMENTS OF THE SIDE-CHAIN PAIR CORRELATION-FUNCTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ELECTRONIC EXCITATION TRANSFER; NONRADIATIVE ENERGY-TRANSFER; TIME-RESOLVED OBSERVABLES; INTEGRAL-EQUATION THEORY; FLUORESCENCE DEPOLARIZATION; POLY(METHYL METHACRYLATE); LOCAL-STRUCTURE; MELTS; STATE; POLYSTYRENE AB Electronic excitation transport among interacting polymer molecules lightly tagged with chromophore substituents is theoretically examined as a function of tagged polymer concentration in the polymeric solid. The results are compared to experimental data obtained in a previous study [Macromolecules 26, 3041 (1993)]. The dependence of time-resolved fluorescence observables on intermolecular polymer structure is of primary interest. A theory is presented which describes excitation transport for both donor-donor (DD) and donor-trap (DT) systems. For the case of DD transport, the theory is based on a first order cumulant approximation to the transport master equation. For DT transport, the theory does not involve approximations and is an exact representation of the assumed model. Ln both cases, the model makes use of the Flory ''ideality'' postulate by depicting the intramolecular segmental distribution as a Gaussian with a second moment that scales linearly with chain size. The only adjustable parameter in the treatment is the form of the intermolecular segmental pair distribution function g(r). The model is found to be extremely sensitive to the behavior of g(r). Comparisons to experimental data indicate that g(r) is primarily made up of hard core interactions between the chromophore sites. The DT calculations display a higher sensitivity to the form of g(r) than the corresponding DD calculations. For purposes of comparison, the analysis is applied to a DT system in which every polymer chain has chromophore tags. The sensitivity of the method for 100% tagged systems to g(r) is comparable to the analysis for systems with only some of the chains tagged. C1 STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 48 TC 17 Z9 17 U1 0 U2 4 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 JUN 15 PY 1994 VL 100 IS 12 BP 9156 EP 9169 DI 10.1063/1.466670 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NR284 UT WOS:A1994NR28400066 ER PT J AU SHALZ, ML DALGLEISH, BJ TOMSIA, AP GLAESER, AM AF SHALZ, ML DALGLEISH, BJ TOMSIA, AP GLAESER, AM TI CERAMIC JOINING-II PARTIAL TRANSIENT LIQUID-PHASE BONDING OF ALUMINA VIA CU/NI-CU MULTILAYER INTERLAYERS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID INTERFACES; DIFFUSION; PLATINUM; METALS; NICKEL AB Multilayer Cu/Ni/Cu interlayers that form a thin layer of a Cu-rich transient liquid phase have been used to join alumina to alumina at 1150-degrees-C. The method and bonding conditions yield an assembly bonded by a Ni-rich (>94 at% Ni) interlayer at a temperature substantially lower than those normally required for solid-state diffusion bonding with pure Ni interlayers. Flexure strengths of as-bonded beams ranged from 61 to 267 MPa with an average of 160 MPa and a standard deviation of +/-63 MPa. The highest flexure strengths were observed in samples where failure occurred in the ceramic. Post-bonding anneals of 10 h duration in air and gettered-argon at 1000-degrees-C decreased the average room temperature strength to 138 and 74 MPa, respectively. In as-processed and annealed samples, varying degrees of interfacial spinel formation are indicated. Spinel formation may contribute to the scatter in as-processed samples, and the decrease in strength values resulting from annealing. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP SHALZ, ML (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 26 TC 36 Z9 38 U1 1 U2 6 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUN 15 PY 1994 VL 29 IS 12 BP 3200 EP 3208 DI 10.1007/BF00356663 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA NU614 UT WOS:A1994NU61400014 ER PT J AU FANG, Y DANYLUK, S LANAGAN, MT GORETTA, KC AF FANG, Y DANYLUK, S LANAGAN, MT GORETTA, KC TI EFFECT OF TEMPERATURE ON THE COEFFICIENT OF FRICTION OF BI2SR2CACU2OX/BI2SR2CACU2OX AND BI2SR2CACU2OX/AG SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID MECHANICAL-PROPERTIES; SUPERCONDUCTORS; SILICON; DENSE; WEAR C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP FANG, Y (reprint author), GEORGIA INST TECHNOL,GEORGE W WOODRUFF SCH MECH ENGN,ATLANTA,GA 30332, USA. NR 20 TC 1 Z9 2 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD JUN 15 PY 1994 VL 13 IS 12 BP 852 EP 855 DI 10.1007/BF00273228 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA NU615 UT WOS:A1994NU61500002 ER PT J AU ROBERTSON, MJ WHITE, CJ ANGELICI, RJ AF ROBERTSON, MJ WHITE, CJ ANGELICI, RJ TI SULFUR-COORDINATED THIOPHENE AND BENZOTHIOPHENE IN CP(NO)(PPH(3))RE(THIOPHENE)(+) - CONVERSION TO THIENYL AND THIENYLCARBENE COMPLEXES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID TRANSITION-METAL COMPLEXES; HYDROGEN-BOND ACTIVATION; HYDRODESULFURIZATION CATALYSTS; DEUTERIUM-EXCHANGE; BENZOTHIOPHENE BT; RHENIUM; REACTIVITY; MODEL; (ETA-THIOPHENE)RU(ETA-C5H5)+; ADSORPTION AB A series of stable sulfur-coordinated thiophene complexes Cp(NO)(PPh(3))Re(eta(1)(S)-Th)(+), Cp = eta(5)-C5H5, Th = thiophene (T), 2,5-Me(2)T, benzo[b]thiophene (BT), and 2-MeBT, are prepared by the reaction of Cp(NO)(PPh(3))Re(ClCH2Cl)(+) with thiophenes. The T and BT complexes react with bases to abstract a proton from the2-carbon of the eta(1)(S)-coordinated thiophenes to give neutral 2-thienyl (2-Tyl) or 2-benzothienyl (2-BTyl) complexes. [GRAPHICS] Reaction of the 2,5-Me(2)T complex with base results in proton abstraction at the 3-carbon to give the 3-(2,5-Me(2)Tyl) complex. The 2-Tyl and 2-BTyl complexes react with CF3SO3H to give cationic thienylcarbene and benzothienylcarbene complexes, respectively, which are isomers of the starting eta(1)(S)-coordinated thiophene complexes. This series of facile reactions demonstrates that eta(1)(S) coordination can activate thiophenes in a way that leads to the disruption of the aromaticity of the thiophene ligand upon formation of the thienylcarbene complexes. The base removal of the 2-proton from eta(1)(S)-thiophene ligands also suggests a mechanism for the exchange of these protons with deuterium during the hydrodesulfurization of thiophenes on heterogeneous catalysts. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 53 TC 39 Z9 39 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 15 PY 1994 VL 116 IS 12 BP 5190 EP 5195 DI 10.1021/ja00091a024 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA NR605 UT WOS:A1994NR60500024 ER PT J AU DEROSE, VJ MUKERJI, I LATIMER, MJ YACHANDRA, VK SAUER, K KLEIN, MP AF DEROSE, VJ MUKERJI, I LATIMER, MJ YACHANDRA, VK SAUER, K KLEIN, MP TI COMPARISON OF THE MANGANESE OXYGEN-EVOLVING COMPLEX IN PHOTOSYSTEM-II OF SPINACH AND SYNECHOCOCCUS SP WITH MULTINUCLEAR MANGANESE MODEL COMPOUNDS BY X-RAY-ABSORPTION SPECTROSCOPY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID WATER OXIDATION CENTER; FINE-STRUCTURE; PHOTOSYNTHETIC APPARATUS; O2-EVOLVING COMPLEX; MAGNETIC-PROPERTIES; EXAFS; STATE; HEMERYTHRIN; CLUSTER; EVOLUTION AB The evaluation of Mn X-ray absorption fine structure (EXAFS) studies on the oxygen-evolving complex (OEC) from photosystem II is described for preparations from both spinach and the cyanobacterium Synechococcus sp. poised in the S-1 and S-2 states. In addition to reproducing previous results suggesting the presence of bis(mu-oxo)bridged Mn centers in the OEC, a Fourier transform peak due to scatterers at an average distance of >3 Angstrom is detected in both types of preparation. In addition, subtle but reproducible changes are found in the relative amplitudes of the Fourier transform peaks due to mainly O (similar to 1.8 Angstrom) and Mn (similar to 2.7 Angstrom) neighbors upon cryogenic advance from the S-1 to the S-2 state. Analysis of the peak due to scatterers at similar to 3 Angstrom favors assignment to (per 4 Mn in the OEC) 1-2 heavy atom (Mn, Ca) scatterers at an average distance of 3.3-3.4 Angstrom. The EXAFS data of several multinuclear Mn model compounds containing such scattering interactions are analyzed and compared with the data for the OEC. Structural models for the OEC are evaluated on the basis of these results. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. NR 56 TC 122 Z9 123 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 JUN 15 PY 1994 VL 116 IS 12 BP 5239 EP 5249 DI 10.1021/ja00091a031 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA NR605 UT WOS:A1994NR60500031 ER PT J AU LIGHTWAHL, KJ SCHWARTZ, BL SMITH, RD AF LIGHTWAHL, KJ SCHWARTZ, BL SMITH, RD TI OBSERVATION OF THE NONCOVALENT QUATERNARY ASSOCIATIONS OF PROTEINS BY ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CONCANAVALIN-A; OLIGONUCLEOTIDE DUPLEX; CONFORMATIONAL-CHANGES; COMPLEX; PEPTIDE; HEMOGLOBIN; SUBSTRATE; MYOGLOBIN; SUBUNIT; FORMS AB The noncovalent tetrameric active forms of avidin, concanavalin A (Con A), and adult human hemoglobin (HbA(0)) can be observed intact in the gas phase by electrospray ionization mass spectrometry (ESI-MS). The atmosphere vacuum ESI interface conditions strongly influence the retention of these weak noncovalent solution associations into the gas phase, as well as the average extent of charging for the subunits upon dissociation. The known solution pH dependence of the dimer-tetramer equilibrium of Con A was observed by ESI-MS, and the intact heterodimeric and -tetrameric active forms of adult human HbA(0), (alpha beta) and (alpha beta)(2), with the prosthetic heme groups could also be characterized by ESI-MS. Under harsher interface conditions a species corresponding to a trimer was observed for each of the proteins, a species not known to be formed under physiological conditions. Differences in the relative stabilities of these tetrameric proteins, formed from the known solution structures, are also qualitatively consistent with the gas-phase stability observed with ESI-MS by adjusting the atmosphere-vacuum interface conditions. The hemoglobin tetramer was found to be less stable in the gas phase than either the Con A or avidin tetramer, consistent with solution dissociation constants. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 40 TC 241 Z9 241 U1 5 U2 31 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 JUN 15 PY 1994 VL 116 IS 12 BP 5271 EP 5278 DI 10.1021/ja00091a035 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA NR605 UT WOS:A1994NR60500035 ER PT J AU NICHOLAS, JB HESS, AC AF NICHOLAS, JB HESS, AC TI AB-INITIO PERIODIC HARTREE-FOCK INVESTIGATION OF A ZEOLITE ACID SITE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MOLECULAR-ORBITAL CALCULATIONS; VALENCE BASIS-SETS; HYDROXYL-GROUPS; FORCE-FIELDS; ABINITIO; MODELS; CONFORMATION; DISILOXANE; FRAMEWORK; CATALYSTS AB We have studied theoretical models of a zeolite Bronsted acid site using ab initio periodic Hartree-Fock (PHF) theory. We present results for both one and two acid sites inside a sodalite structure (beta-cage). We optimized the geometry of the bridging hydroxyl groups using the STO-3G basis set. All other reported crystal properties were evaluated using the more complete 6-21G* (in which the outermost orbital exponents were reoptimized for the solid) level of theory. The results of the periodic calculations are compared to available experimental data, similar periodic calculations of silica sodalite in which there are no acid sites, and calculations of clusters that mimic parts of the periodic structure. The optimized geometry of the single bridging hydroxyl group has internal coordinates of Si-O = 1.64 Angstrom, Al-0 = 1.72 Angstrom, O-H = 0.97 Angstrom, Si-O(H)-Al = 136.3 degrees, and Si-O-H = 110.7 degrees, and the hydrogen is bent 25.2 degrees out of the Si-O-Al plane. The optimized geometry of the bridging hydroxyl group in the two-acid site model is very similar, with Si-O = 1.65 Angstrom, Al-0 = 1.72 Angstrom, O-H = 0.97 Angstrom, Si-O(H)-Al = 135.5 degrees, Si-O-H = 112.7 degrees, and an out-of-plane angle of 21.5 degrees. We find that similar geometries can be obtained using isolated clusters that mimic the periodic lattice; however, there are significant differences. In particular, the optimized values of the internal coordinates oscillate with increasing cluster size, giving little confidence in our ability to determine the size of the cluster needed to obtain convergence. We also compare our results to a PHF calculation of the pure SiO2 lattice (devoid of the acid site) to illustrate the changes in electronic properties that occur due to the introduction of the acid site. RP NICHOLAS, JB (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 41 TC 61 Z9 61 U1 0 U2 6 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 JUN 15 PY 1994 VL 116 IS 12 BP 5428 EP 5436 DI 10.1021/ja00091a055 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA NR605 UT WOS:A1994NR60500055 ER PT J AU ZHOU, FM VANBERKEL, GJ DONOVAN, BT AF ZHOU, FM VANBERKEL, GJ DONOVAN, BT TI ELECTRON-TRANSFER REACTIONS OF C60F48 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID FLUORINATED FULLERENES; MASS-SPECTROMETRY; ION TRAP; IONIZATION; BUCKMINSTERFULLERENE; C-60 C1 UNIV N CAROLINA,DEPT CHEM,CHARLOTTE,NC 28223. RP ZHOU, FM (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 21 TC 100 Z9 101 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 15 PY 1994 VL 116 IS 12 BP 5485 EP 5486 DI 10.1021/ja00091a069 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NR605 UT WOS:A1994NR60500069 ER PT J AU KAMEDA, J RANJAN, R AF KAMEDA, J RANJAN, R TI CHARACTERIZATION OF DEFORMATION AND FRACTURE-BEHAVIOR IN AMORPHOUS AND OR CERAMIC COATINGS AND ALUMINUM-ALLOY SUBSTRATES BY SMALL PUNCH TESTING AND ACOUSTIC-EMISSION TECHNIQUES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID INTERGRANULAR EMBRITTLEMENT AB Deformation and fracture behavior in Al alloy substrates coated with and without amorphous Ni-10wt.%P (10 mum thick) and overlaying Y2O3-stabilized ZrO2 (0-1.0 mum thick) ceramics has been investigated by small punch (SP) testing and acoustic emission (AE) techniques. SP tests showed that an Ni-P coating increased the yield strength sigma(y) by 40% and slightly decreased the fracture toughness J(Ic) compared with the result of an uncoated Al alloy. All overlaying ceramic coatings except a 1.0 mum thick coating did not strongly affect sigma(y). Ceramic coatings with thicknesses of 0.25 and 1.0 mum lead to 15%-20% decreases in J(Ic) while a 0.5 mum thick coating maintained almost the same level of J(Ic) as the uncoated alloy. It was found that cracks in the Ni-P coating propagate more extensively along the radial and tangential directions under the biaxial stress condition than in the Ni-P and ceramics coatings. The measurement of cumulative AE events was capable of identifying the severity of coating cracking in the alloys coated with and without overlaying ceramics. The coating effect on J(Ic) is discussed in terms of residual stress induced during coating processing. C1 KOMAG INC,MILPITAS,CA 95035. RP KAMEDA, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 16 TC 2 Z9 2 U1 0 U2 1 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 JUN 15 PY 1994 VL 183 IS 1-2 BP 121 EP 130 DI 10.1016/0921-5093(94)90896-6 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA NT143 UT WOS:A1994NT14300013 ER PT J AU BAUMBAUGH, B ERDMAN, J GASKELL, D LU, Q MARCHANT, J RUCHTI, R WAYNE, M COOPER, C HINSON, J KOLTICK, DS SCHMITZ, CJ SHIBATA, EI CHUNG, M MARGULIES, S SOLOMON, J ATAC, M BAUMBAUGH, A BROSS, AD ELIAS, J MISHINA, M CHANEY, R HAMMACK, H ADAMS, D BIRD, F LEWIS, RA AF BAUMBAUGH, B ERDMAN, J GASKELL, D LU, Q MARCHANT, J RUCHTI, R WAYNE, M COOPER, C HINSON, J KOLTICK, DS SCHMITZ, CJ SHIBATA, EI CHUNG, M MARGULIES, S SOLOMON, J ATAC, M BAUMBAUGH, A BROSS, AD ELIAS, J MISHINA, M CHANEY, R HAMMACK, H ADAMS, D BIRD, F LEWIS, RA TI PERFORMANCE OF MULTICLAD SCINTILLATING AND CLEAR WAVE-GUIDE FIBERS READ-OUT WITH VISIBLE-LIGHT PHOTON COUNTERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID TRACKING AB Measurements have been made of the performance of scintillating fibers read out with visible light photon counters (VLPCs). The light yields of single-clad and multiclad scintillating fibers have been compared. The experiment consisted of 3 m long scintillating fibers of 830 mum diameter optically coupled to 8 m long waveguide fibers of 965 mum diameter read out with HISTE-IV VLPCs. For the case of multiclad scintillating fiber and waveguide, an average of 6.2 photoelectrons was detected from the far end of the scintillating fiber if the fiber end was unmirrored, and 10.2 photoelectrons if the fiber end was mirrored. With this substantial photoelectron yield, minimum-ionizing tracks can be easily detected in fiber arrays, and excellent performance characteristics are expected for the fiber trackers designed for the D0 experiment at the Fermilab Tevatron Collider and the SDC experiment at the SSC Laboratory. C1 UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. SUPERCOND SUPER COLLIDER LAB,DALLAS,TX 75237. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV TEXAS,DEPT PHYS,RICHARDSON,TX 75083. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. NR 18 TC 33 Z9 33 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 JUN 15 PY 1994 VL 345 IS 2 BP 271 EP 278 DI 10.1016/0168-9002(94)91001-4 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NQ032 UT WOS:A1994NQ03200008 ER PT J AU LOCK, JS BERTSON, E BOISSEVAIN, J CLARK, DJ COLLIER, W HAMMOCK, R JACAK, BV MORGAN, A ROYBAL, P SHAHEEN, S SIMONGILLO, J SULLIVAN, JP AF LOCK, JS BERTSON, E BOISSEVAIN, J CLARK, DJ COLLIER, W HAMMOCK, R JACAK, BV MORGAN, A ROYBAL, P SHAHEEN, S SIMONGILLO, J SULLIVAN, JP TI AIR COOLING OF FRONT-END ELECTRONICS FOR SILICON DETECTORS IN A COLLIDER EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have investigated the feasibility of using room temperature air to cool front-end electronics for silicon microstrip and pad detectors in a collider experiment. Advantages of air cooling include minimal material in the path of the particles and no potential of coolant spills in the silicon region. A prototype cooling system was tested with heat provided by flat resistive heaters. Heat loads from 1 to 27 mW/channel were studied, making the results applicable to various silicon detector systems. The measurements are compared to cooling system performance predictions. A set of simple equations has been identified and tested which reliably describe the lab setup. C1 LOS ALAMOS NATL LAB,DIV PHYS,MS D456,LOS ALAMOS,NM 87545. RI Shaheen, Sean/M-7893-2013 NR 4 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1994 VL 345 IS 2 BP 284 EP 288 DI 10.1016/0168-9002(94)91003-0 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NQ032 UT WOS:A1994NQ03200010 ER PT J AU OSBORNE, JH ROMERO, JL BRADY, FP HJORT, EL CASKEY, WP KINTNER, JC MAYO, DR SORENSON, DS ULLMANN, JL AF OSBORNE, JH ROMERO, JL BRADY, FP HJORT, EL CASKEY, WP KINTNER, JC MAYO, DR SORENSON, DS ULLMANN, JL TI A COMPACT SYSTEM WITH LIVE CONVERTER FOR NEUTRON-SPECTRUM MEASUREMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MULTIWIRE CHAMBER SYSTEM AB A ''live'' plastic scintillator converter has been added to our compact, neutron detector system. The latter employs a large-area, proton telescope, consisting of multiwire chambers, DELTAE and E detectors to measure the energy and angle of recoil protons. The ''live'' converter provides an increase in count rate by a factor of 6 as well as some improvement in neutron energy resolution. Neutron scattering data for a 65 MeV neutron beam at CNL and for neutron energies from 60 to 240 MeV at LAMPF have been taken with this type of system. C1 UNIV CALIF DAVIS,CROCKER NUCL LAB,DAVIS,CA 95616. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 9 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1994 VL 345 IS 2 BP 308 EP 312 DI 10.1016/0168-9002(94)91007-3 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NQ032 UT WOS:A1994NQ03200014 ER PT J AU CRAWLEY, HB MCKAY, R MEYER, WT NUTTER, S TARLE, G ROSENBERG, EI THOMAS, WD AF CRAWLEY, HB MCKAY, R MEYER, WT NUTTER, S TARLE, G ROSENBERG, EI THOMAS, WD TI CHARACTERIZATION AND RADIATION TESTING OF THE HARRIS HS9008RH FLASH ANALOG-TO-DIGITAL CONVERTER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Results from tests characterizing the performance and radiation hardness of the HS9008RH flash analog to digital convertor (FADC) are presented. These tests were performed primarily to evaluate the suitability of this device for use in the GEM Central Tracker at the SSC experiment. Basic performance characteristics and susceptibility of these characteristics to radiation were examined. Performance test results indicate that the device integral nonlinearity is sampling rate dependent and worsens rapidly above a sampling rate of 15 megasamples per second (MSPS). No degradation in performance of the device was observed after its exposure of up to 81 Mrad of 1.25 MeV gamma radiation from a Co-60 source. Exposure of the device to a reactor fast neutron fluence (E > 100 keV) of 5 x 10(14)/cm2 resulted in no significant observed performance degradation as well. C1 UNIV MICHIGAN,RANDALL LAB PHYS,DEPT PHYS,ANN ARBOR,MI 48109. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1994 VL 345 IS 2 BP 329 EP 336 DI 10.1016/0168-9002(94)91010-3 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NQ032 UT WOS:A1994NQ03200017 ER PT J AU HAILEY, CJ BIXLER, JV AF HAILEY, CJ BIXLER, JV TI A TUNABLE X-RAY SOURCE FOR CHARACTERIZATION OF X-RAY DISPERSING ELEMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have built a wavelength tunable X-ray source for calibration of X-ray dispersers. The source utilizes a double-element, constant exit-angle monochromator to select a given X-ray energy out of a beam of broad-band radiation. An example of the sources utility for select crystal calibrations is presented. RP HAILEY, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,L-401,POB 808,LIVERMORE,CA 94550, USA. NR 12 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 JUN 15 PY 1994 VL 345 IS 2 BP 393 EP 398 DI 10.1016/0168-9002(94)91018-9 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NQ032 UT WOS:A1994NQ03200025 ER PT J AU STRELI, C WOBRAUSCHEK, P LADISICH, W RIEDER, R AIGINGER, H RYON, RW PIANETTA, P AF STRELI, C WOBRAUSCHEK, P LADISICH, W RIEDER, R AIGINGER, H RYON, RW PIANETTA, P TI TOTAL-REFLECTION X-RAY-FLUORESCENCE ANALYSIS OF LIGHT-ELEMENTS USING SYNCHROTRON-RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MICROANALYSIS; SPECTROMETER; EXCITATION; MICROPROBE AB Synchrotron radiation from SSRL (Stanford Synchrotron Radiation Laboratory) Beam Line III-4 was used as excitation source for Total Reflection X-ray Fluorescence Analysis (TXRF) of light elements (Z < 14). Due to the outstanding features of synchrotron radiation this source is best suited for the photon induced excitation of light elements offering a large number of photons in the energy range of interest. The high intensity and the natural collimation of the beam is ideal for total reflection geometry. The experiments were performed with a special TXRF spectrometer using an ultrathin window Ge(HP) detector for the energy dispersive measurement of light elements. BL III-4 is equipped with a cut-off mirror (E(cut) = 3 keV) for white beam measurements, and a double multilayer monochromator can be inserted. Detection limits of some hundred femtograms have been obtained for Mg with the white beam excitation. Boron could be detected with monochromatic excitation. C1 STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP UNIV VIENNA, INST ATOM, SCHUTTELSTR 115, A-1020 VIENNA, AUSTRIA. OI Streli, Christina/0000-0002-5141-3177 NR 26 TC 28 Z9 28 U1 0 U2 3 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 JUN 15 PY 1994 VL 345 IS 2 BP 399 EP 403 DI 10.1016/0168-9002(94)91019-7 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NQ032 UT WOS:A1994NQ03200026 ER PT J AU DAWSON, SP MINEEVWEINSTEIN, M AF DAWSON, SP MINEEVWEINSTEIN, M TI LONG-TIME BEHAVIOR OF THE N-FINGER SOLUTION OF THE LAPLACIAN GROWTH EQUATION SO PHYSICA D LA English DT Article ID HELE-SHAW CELLS; DIFFUSION-LIMITED AGGREGATION; INTERFACE DYNAMICS; CRYSTAL-GROWTH; CURVES; FLOWS AB The non-singular N-finger solutions of the Laplacian Growth Equation, Im [(partial derivative f (x, t)/partial derivative t)BAR (partial derivative f (x, t)/partial derivative x] = 1, describing the motion of the interface in numerous non-equilibrium processes, such as dendritic growth, flows through porous media, electrodeposition, etc., is analyzed. The motion of the interface is described by N + 1 moving singularities (simple poles) in the upper-half of an auxiliar ''mathematical plane''. In the long-time limit these singularities tend to the real axis, following an exponential law. Meanwhile, the physical interface develops at most N separated fingers. In the case of enough separation, each of the gaps between fingers corresponds to one singularity while each finger is locally similar to the Saffman-Taylor one. The analogy with the N-soliton solutions of exactly integrable PDE's, such as Korteweg-de Vries, Nonlinear Schrodinger, and sine-Gordon equations, is discussed. Using the asymptotic properties of the N-finger solution, canonical variables of ''action-angle''-type are introduced. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP DAWSON, SP (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Ponce Dawson, Silvina/0000-0001-6550-4267 NR 34 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 15 PY 1994 VL 73 IS 4 BP 373 EP 387 DI 10.1016/0167-2789(94)90106-6 PG 15 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA NV669 UT WOS:A1994NV66900006 ER PT J AU BLYTH, RIR ANDREWS, AB ARKO, AJ JOYCE, JJ CANFIELD, PC BENNETT, BI WEINBERGER, P AF BLYTH, RIR ANDREWS, AB ARKO, AJ JOYCE, JJ CANFIELD, PC BENNETT, BI WEINBERGER, P TI VALENCE-BAND PHOTOEMISSION AND AUGER-LINE-SHAPE STUDY OF AUXPD1-X SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; SPECTRA; ALLOYS; PD; DENSITY; PALLADIUM; SILVER; STATES; AU; SPECTROSCOPY AB We report an experimental study of the electronic structure of the alloy system AuxPd1-x. Valence-band photoemission spectra were recorded using synchrotron radiation, exploiting the different photoionization cross sections of the Au and Pd d bands to identify the spectral features. We find that recent electronic-structure calculations using the Korringa-Kohn-Rostoker method with the coherent-potential approximation (KKR-CPA) give good agreement with our results, whereas earlier calculations using other methods show serious discrepancies. In addition we measured the Au N6,7VV and Pd M4,5VV Auger line shapes. We find that one-electron calculations using the KKR-CPA results give reasonable qualitative agreement for the Au line shapes across the alloy series. Similar agreement is found for the Pd Auger line shapes at high Pd concentrations, but this breaks down for low Pd concentrations. We suggest that this disagreement results from a neglect of many-body interactions rather than a problem with the KKR-CPA calculations. C1 VIENNA TECH UNIV,INST TECH ELEKTROCHEM,A-1060 VIENNA,AUSTRIA. RP BLYTH, RIR (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 36 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 JUN 15 PY 1994 VL 49 IS 23 BP 16149 EP 16155 DI 10.1103/PhysRevB.49.16149 PG 7 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500005 ER PT J AU KANG, JS HONG, JH HWANG, DW JEONG, JI CHOI, SD YANG, CJ LEE, YP OLSON, CG KANG, K MIN, BI AF KANG, JS HONG, JH HWANG, DW JEONG, JI CHOI, SD YANG, CJ LEE, YP OLSON, CG KANG, K MIN, BI TI HYBRIDIZATION AND CORRELATION-EFFECTS IN THE PHOTOEMISSION SPECTRA OF RNI2 (R=CE, PR, AND ND) SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; TRANSITION-METALS; AUGER-SPECTRA; STATES; 4F; SPECTROSCOPIES; DENSITY; MODEL; YBAL3; NI AB Electronic structures of RNi2 (R = Y, Ce, Pr, and Nd) are investigated systematically by using photoemission spectroscopy (PES) and compared with those of RCo2. Double-peak structures are observed in the R 4f PES spectra, in which the spectral weight near E(F) decreases from Ce to Pr and Nd, suggesting a decrease in the R 4f-Ni 3d hybridization from Ce to Pr and Nd. For the same R, the spectral weight near E(F) in RNi2 is smaller than that in RCO2, implying a smaller R 4f hybridization with Ni 3d electrons in RNi2 than with Co 3d electrons in RCo2. These trends are consistent with those in the calculated hybridization matrix elements for RM2 (M = Co and Ni). A pronounced Ni 3d satellite is observed, which arises from Ni 3d Coulomb correlation effects. The Ni 3d partial spectral weight distribution in RNi2 exhibits important discrepancies from the calculated Ni 3d angular momentum projected local density of states (PLDOS), such as peak positions and line shapes, indicating substantial Ni 3d correlation effects. These discrepancies are qualitatively similar to, and quantitatively larger than, those for RCo2. Quasiparticle spectral densities are calculated by using the Hubbard Hamiltonian and including Co and Ni 3d electron correlation effects, which yield a better agreement with PES spectra than the local-density approximation PLDOS's. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. POHANG UNIV SCI & TECHNOL,DEPT PHYS,POHANG 790600,SOUTH KOREA. GYEONGSANG NATL UNIV,DEPT PHYS,CHINJU 660701,SOUTH KOREA. RP KANG, JS (reprint author), RES INST IND SCI & TECHNOL,POHANG 790600,SOUTH KOREA. NR 46 TC 21 Z9 21 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 23 BP 16248 EP 16255 DI 10.1103/PhysRevB.49.16248 PG 8 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500016 ER PT J AU GULLIKSON, EM DENHAM, P MROWKA, S UNDERWOOD, JH AF GULLIKSON, EM DENHAM, P MROWKA, S UNDERWOOD, JH TI ABSOLUTE PHOTOABSORPTION MEASUREMENTS OF MG, AL, AND SI IN THE SOFT-X-RAY REGION BELOW THE L2,3 EDGES SO PHYSICAL REVIEW B LA English DT Article ID OPTICAL-CONSTANTS; PHOTOELECTRIC YIELD; SILICON; THRESHOLD; ALUMINUM; AG; AU AB Absolute measurements of the photoabsorption coefficient of Mg, Al, and Si from 25 eV up to the L3 absorption edge are presented. Transmission measurements were performed on free-standing thin films using a laser-produced plasma source. The surface oxide is corrected for by taking the ratio of the absorption for different film thicknesses. The values so obtained are, in general, lower than have been reported in the literature. Structure below the edge is observed for Al and Si. Despite the fact that the absorption below the L3 edge is due to the valence or conduction electrons, the magnitude of the absorption coefficient for the solid is much higher than is predicted by a simple Drude model and is close to that expected from calculations for the free atom. RP GULLIKSON, EM (reprint author), LAWRENCE BERKELEY LAB,CTR MAT SCI,CTR X-RAY OPT,BERKELEY,CA 94720, USA. NR 25 TC 33 Z9 34 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 23 BP 16283 EP 16288 DI 10.1103/PhysRevB.49.16283 PG 6 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500020 ER PT J AU MAYUR, AJ SCIACCA, MD UDO, MK RAMDAS, AK ITOH, K WOLK, J HALLER, EE AF MAYUR, AJ SCIACCA, MD UDO, MK RAMDAS, AK ITOH, K WOLK, J HALLER, EE TI FINE-STRUCTURE OF THE ASYMMETRIC STRETCHING VIBRATION OF DISPERSED OXYGEN IN MONOISOTOPIC GERMANIUM SO PHYSICAL REVIEW B LA English DT Article ID INTERSTITIAL OXYGEN; INFRARED-ABSORPTION; SILICON; CRYSTALS; SPECTROSCOPY; SPECTRUM; GE-70 AB Dispersed oxygen in Ge leads to the formation of Ge2O ''quasimolecules'' whose,asymmetric stretching mode (nu3), exhibits a remarkable, temperature-dependent fine structure when examined under the ultrahigh resolution of a Fourier-transform spectrometer. The large number of sharp lines observed arises from the coupling Of nu3 With the low-energy symmetric bending nu2 mode; the thermal population of the nu2 levels, together with the shifts associated with the isotopes of Ge in their natural abundances, underlie its fine structure and temperature dependence. By incorporating oxygen in monoisotopic Ge-70, Ge-73, Ge-74, or Ge-76, the excitation spectrum of the nu2 + nu3 COUPling is selectively simplified. From the temperature dependence of the intensities of the lines in the fine structure, the energies of the nu2 levels are deduced. The O-18 counterpart of the nu2 + nu3 coupling excitation has been observed and a consistent interpretation of the nu2 levels as well as the shifts of the nu2 + nu3 coupling excitations associated with any isotopic combination of oxygen and Ge is obtained by using an interaction mass m' = 23.1 amu and a Ge-0-Ge bond angle 2alpha = 111-degrees. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MAYUR, AJ (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. RI Itoh, Kohei/C-5738-2014 NR 27 TC 37 Z9 37 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 23 BP 16293 EP 16299 DI 10.1103/PhysRevB.49.16293 PG 7 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500022 ER PT J AU MILMAN, V LEE, MH PAYNE, MC AF MILMAN, V LEE, MH PAYNE, MC TI GROUND-STATE PROPERTIES OF COSI2 DETERMINED BY A TOTAL-ENERGY PSEUDOPOTENTIAL METHOD SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; 1ST-PRINCIPLES CALCULATION; MOLECULAR-DYNAMICS; CHARGE-DENSITIES; LARGE SYSTEMS; SI; GE; SILICON; NISI2 AB We calculate the lattice properties and electronic structure of cobalt disilicide using an ab initio total-energy method with optimized pseudopotentials. Special attention is paid to the development of a soft robust pseudopotential for the 3d element Co. The calculated band structure of CoSi2 agrees well with the results of all-electron studies and the equilibrium lattice constant, bulk modulus, and zone-center phonon frequencies obtained are in good agreement with experimental data. C1 UNIV CAMBRIDGE,DEPT PHYS,CAMBRIDGE CB3 0HE,ENGLAND. RP MILMAN, V (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Milman, Victor/M-6117-2015 OI Milman, Victor/0000-0003-2258-1347 NR 45 TC 26 Z9 27 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 JUN 15 PY 1994 VL 49 IS 23 BP 16300 EP 16308 DI 10.1103/PhysRevB.49.16300 PG 9 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500023 ER PT J AU REYES, AP HEFFNER, RH CANFIELD, PC THOMPSON, JD FISK, Z AF REYES, AP HEFFNER, RH CANFIELD, PC THOMPSON, JD FISK, Z TI BI-209 NMR AND NQR INVESTIGATION OF THE SMALL-GAP SEMICONDUCTOR CE3BI4PT3 SO PHYSICAL REVIEW B LA English DT Article ID ELECTRIC-FIELD GRADIENT; TEMPERATURE-DEPENDENCE; NONCUBIC METALS; HYBRIDIZATION GAP; EXCITATION; LATTICE AB We report measurements of the temperature dependence of the Bi2O9 nuclear quadrupole resonance frequency nu(Q), the Knight shift K, and the spin-lattice relaxation rate 1/T1 in the small-gap semiconductor Ce3Bi4Pt3 between 1.8 and 300 K. Corresponding measurements also are reported for the nonmagnetic metallic isomorph La3Bi4Pt3. The nu(Q) data in the Ce compound show a characteristic departure from metallic-to-insulating behavior when the sample is cooled below T(M) = 80 K, the temperature of the susceptibility maximum, attributable to a loss of low-frequency vibrational modes in the insulating state. The Knight shift has both isotropic and axial components; this anisotropy originates from the presence of Ce via a transferred hyperfine coupling between Ce 4f and conduction electrons. An s-f exchange constant greater-than-or-equal-to 0.4 eV is found, consistent with hybridization in other rare-earth intermetallic compounds. A change in the scaling between the susceptibility and both the isotropic and axial Knight shifts at temperature T(M) provides evidence that hybridization between the Ce 4f orbitals and the conduction electrons is responsible for the gap structure. The temperature dependence of the 1/T1 data is consistent with a model electronic density of states possessing a temperature-independent pp 8 of 180 K and a bandwidth of the order of 1600 K. The temperature dependence of 1/T1 can also be fit well with a temperature-dependent gap with delta(0) also almost-equal-to 180 K. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RI Canfield, Paul/H-2698-2014 NR 31 TC 29 Z9 29 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 JUN 15 PY 1994 VL 49 IS 23 BP 16321 EP 16330 DI 10.1103/PhysRevB.49.16321 PG 10 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500026 ER PT J AU CHOI, IH YU, PY AF CHOI, IH YU, PY TI RESONANT RAMAN-SCATTERING AND EXCITON-PHONON INTERACTIONS IN AGGASE2 SO PHYSICAL REVIEW B LA English DT Article ID LATTICE-DYNAMICS; SEMICONDUCTORS; LUMINESCENCE; GAP AB Enhancements in Raman-scattering cross sections of phonon modes in AgGaSe2 have been observed both at room temperature and at liquid-nitrogen temperature. At low temperature the observed enhancements can be explained by outgoing resonances of the scattered photons at the lowest-energy free exciton. At resonance, multiphonon modes involving as many as three longitudinal-optical (LO) phonons have been observed. Exciton energy and damping constant and relative strengths of exciton-LO-phonon (Frohlich) interactions in AgGaSe2 have been determined. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. CHUNG ANG UNIV,DEPT PHYS,SEOUL,SOUTH KOREA. RP CHOI, IH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 20 TC 18 Z9 18 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 JUN 15 PY 1994 VL 49 IS 23 BP 16407 EP 16414 DI 10.1103/PhysRevB.49.16407 PG 8 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500037 ER PT J AU YOON, M MOCHRIE, SGJ ZEHNER, DM WATSON, GM GIBBS, D AF YOON, M MOCHRIE, SGJ ZEHNER, DM WATSON, GM GIBBS, D TI FACETING AND THE ORIENTATIONAL PHASE-DIAGRAM OF STEPPED PT(001) SURFACES SO PHYSICAL REVIEW B LA English DT Article ID VICINAL SI(111) SURFACES; X-RAY REFLECTIVITY; HEXAGONALLY RECONSTRUCTED PT(001); EQUILIBRIUM CRYSTAL SHAPES; CRITICAL-BEHAVIOR; AU(001) SURFACE; SCATTERING; TRANSITIONS; DIFFRACTION; MORPHOLOGY AB The results of synchrotron-x-ray-scattering studies of stepped Pt(001) surfaces are reported. An orientational phase diagram is proposed for Pt surfaces between the cubic (001) orientation and orientations tilted 6-degrees away from the [001] direction towards the [110] direction, and for temperatures between 300 and 1850 K. Four distinct orientational phases are identified. At the highest temperatures, we find a one-phase region in which the surface is rough with the local surface normal equal to the macroscopic surface normal. Below T0 = 1820 K, hexagonally reconstructed (001) facets appear in coexistence with the tilted rough phase. The phase boundary of the rough phase decreases with temperature as a quadratic function of the tilt angle away from the [001] direction, consistent with simple theoretical ideas. Below T1 = 1630 K, there are two symmetry-related 2-degrees magic vicinal phases with azimuthal orientations symmetrically rotated away from the cubic [110] direction by +/- 4.8-degrees. The 2-degrees magic vicinals are reconstructed, so that the terraces between their constituent steps form a corrugated and rotated quasihexagonal structure. Remarkably, the steps are parallel to the troughs and crests of the corrugation. In addition, the tilt angle appears closely related to the period of the reconstruction, favoring an integer (3 or 4) or half integer (9/2 or 7/2) number of corrugation periods on each terrace between steps, depending on the temperature. Finally, below T2 = 1590 K, we find the 6-degrees magic vicinal phase. Its microscopic structure involves terraces upon which there is one period of the surface corrugation. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP YOON, M (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. NR 52 TC 34 Z9 34 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 23 BP 16702 EP 16720 DI 10.1103/PhysRevB.49.16702 PG 19 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500075 ER PT J AU DURR, H POLER, DB ZEHNER, DM BARRETT, JH AF DURR, H POLER, DB ZEHNER, DM BARRETT, JH TI DETERMINATION OF THE RECONSTRUCTION OF CU(100)-(2X3)-N WITH HIGH-ENERGY ION-SCATTERING SO PHYSICAL REVIEW B LA English DT Note ID CU(110)(2X3)-N STRUCTURE; SURFACE-STRUCTURE; SPECTROSCOPY; NITROGEN; SITE; LEED AB Surface yield measurements with single-alignment high-energy ion scattering, at normal incidence, are used to show that the Cu(110)-(2X3)-N surface is reconstructed according to an additional-row model, where the first-layer density of Cu atoms is increased to 4/3 monolayers. A surface-reconstruction model involving missing rows can be excluded. We also find that 2/3 of the second-and third-layer atoms are displaced laterally, from their bulklike positions, by 0.30 and 0.07 angstrom, respectively. Off-normal-incidence measurements indicate additional vertical atomic displacements in the second and third layers. C1 UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP DURR, H (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Durr, Hermann/F-6205-2012 NR 18 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 23 BP 16789 EP 16792 DI 10.1103/PhysRevB.49.16789 PG 4 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500089 ER PT J AU BOETTGER, JC AF BOETTGER, JC TI NONCONVERGENCE OF SURFACE ENERGIES OBTAINED FROM THIN-FILM CALCULATIONS SO PHYSICAL REVIEW B LA English DT Note ID CRYSTALLINE; LITHIUM; METALS AB It is demonstrated that one of the most common methods used to determine surface energies from thin-film total-energy calculations introduces a computational error that increases linearly with the thickness of the film. This linear divergence is shown to have had a major impact on a recent calculation of the Li(111) surface energy, using one- to five-layer-thick films. RP BOETTGER, JC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 13 TC 189 Z9 190 U1 3 U2 30 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 23 BP 16798 EP 16800 DI 10.1103/PhysRevB.49.16798 PG 3 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500092 ER PT J AU MANDRUS, D SARRAO, JL LACERDA, A MIGLIORI, A THOMPSON, JD FISK, Z AF MANDRUS, D SARRAO, JL LACERDA, A MIGLIORI, A THOMPSON, JD FISK, Z TI LOW-TEMPERATURE THERMAL-EXPANSION OF SMB6 - EVIDENCE FOR A SINGLE-ENERGY SCALE IN THE THERMODYNAMICS OF KONDO INSULATORS SO PHYSICAL REVIEW B LA English DT Note ID STATE; GAP AB We have measured the thermal expansion of the Kondo insulator SmB6 from 5 to 80 K using a sensitive capacitance dilatometer. There is a pronounced negative anomaly in the linear expansion coefficient alpha, of electronic origin, which achieves a local minimum of -5 x 10(-6) K-1 at 45 K. We interpret this anomaly as a Schottky-like contribution arising from transitions across a semiconducting energy gap E(g) approximately 140 K. Although there are several energy scales in the problem, a Gruneisen analysis indicates that the thermodynamics is driven by a single energy, which we identify as the gap energy. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. NATL HIGH MAGNET FIELD LAB,LOS ALAMOS,NM 87545. RP MANDRUS, D (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Mandrus, David/H-3090-2014 NR 25 TC 22 Z9 23 U1 1 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 JUN 15 PY 1994 VL 49 IS 23 BP 16809 EP 16812 DI 10.1103/PhysRevB.49.16809 PG 4 WC Physics, Condensed Matter SC Physics GA NT525 UT WOS:A1994NT52500096 ER PT J AU THOMSON, RE BURK, B ZETTL, A CLARKE, J AF THOMSON, RE BURK, B ZETTL, A CLARKE, J TI SCANNING-TUNNELING-MICROSCOPY OF THE CHARGE-DENSITY-WAVE STRUCTURE IN 1T-TAS2 SO PHYSICAL REVIEW B LA English DT Article ID ATOMIC FORCE MICROSCOPY; ELECTRON-MICROSCOPY; COMMENSURATE PHASE; X-RAY; TUNNELLING MICROSCOPY; ROOM-TEMPERATURE; DISCOMMENSURATIONS; TRANSITION; MODULATION; GRAPHITE AB Using scanning tunneling microscopy (STM), we studied 1T-TaS2 in all four of its charge-density-wave (CDW) supporting phases over the temperature range 360-143 K. Special attention was given to the search for discommensurate structures and the distinguishing of true CDW discommensurations and domains from apparent discommensurations and domains formed by interference between the CDW and the atomic lattice. In the lowest-temperature commensurate (C) phase, we find that the CDW is in the commensurate configuration as expected. We use the C phase to investigate the effects of multiple tips and find that shifts in the apparent registration of the CDW relative to the atomic lattice result. In the nearly commensurate (NC) phase, the CDW is in a true domain structure as evidenced by satellite spots in the Fourier transforms of the STM images. In the triclinic (T) phase, the STM data indicate that the CDW is in a striped domain phase, which is significantly different from the domain model previously proposed. Finally, in the high-temperature incommensurate (I) phase, we find unexpected satellite spots in the STM Fourier transforms, suggesting that a CDW modulation is also present in this phase. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 40 TC 34 Z9 34 U1 2 U2 25 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 24 BP 16899 EP 16916 DI 10.1103/PhysRevB.49.16899 PG 18 WC Physics, Condensed Matter SC Physics GA NW027 UT WOS:A1994NW02700002 ER PT J AU MILLER, LA BRICE, DK PRINJA, AK PICRAUX, ST AF MILLER, LA BRICE, DK PRINJA, AK PICRAUX, ST TI DISPLACEMENT-THRESHOLD ENERGIES IN SI CALCULATED BY MOLECULAR-DYNAMICS SO PHYSICAL REVIEW B LA English DT Article ID PHASE CRYSTAL-GROWTH; PARTICLE BOMBARDMENT; QUASIDYNAMICS SIMULATIONS; COMPUTER-SIMULATION; MICROSCOPIC THEORY; SILICON CLUSTERS; SI(100) SURFACE; DIFFUSION; SEMICONDUCTORS; INTERSTITIALS AB Molecular-dynamics calculations of simple defect production in bulk Si are reported. The Tersoff three-body potential-energy function is used to provide a realistic lattice-atom interaction potential. The displacement-threshold energy E(d) is calculated as a function of the initial primary knock-on momentum direction, and the formation energies for resulting defect structures are obtained. In addition, we determine the effect of the vacancy-interstitial separation on the anisotropy in E(d), where the criterion for stable Frenkel-pair defect formation is assumed to require a certain minimum separation. The resultant angular dependent E(d) versus (theta,phi) is compared with that proposed by Hemment and Stevens (HS) to account for the magnitude and anisotropy of the observed energetic electron-induced radiation damage in Si. The anisotropy of our E(d) surface is consistent with that of HS provided a lower limit of 4 angstrom is placed on the initial Frenkel-pair separation for the production of long-lived damage. The relatively large formation energy of 8.4 eV which we obtain for such widely separated vacancy-interstitial pairs indicates that the individual point defects are essentially isolated (i.e., noninteracting). More closely spaced vacancy-interstitial complexes are also identified, which have lower formation energies. While it is argued that these complexes are relatively short lived, they may be relevant to dynamical processes such as beam-enhanced molecular-beam epitaxy, atomic mixing at interfaces, and ''subthreshold'' damage production. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. RP MILLER, LA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 39 TC 30 Z9 30 U1 0 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1994 VL 49 IS 24 BP 16953 EP 16964 DI 10.1103/PhysRevB.49.16953 PG 12 WC Physics, Condensed Matter SC Physics GA NW027 UT WOS:A1994NW02700006 ER PT J AU FUNG, AWP WANG, ZH DRESSELHAUS, MS DRESSELHAUS, G PEKALA, RW ENDO, M AF FUNG, AWP WANG, ZH DRESSELHAUS, MS DRESSELHAUS, G PEKALA, RW ENDO, M TI COULOMB-GAP MAGNETOTRANSPORT IN GRANULAR AND POROUS CARBON STRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID METAL-INSULATOR-TRANSITION; HOPPING CONDUCTIVITY; DISORDERED-SYSTEMS; FIBERS; TRANSPORT; AEROGELS; RANGE; PHOTOCONDUCTIVITY; FILMS AB The possibility of observing a Coulomb gap due to carrier-carrier interactions in granular metallic systems is investigated, with particular emphasis on porous carbon structures such as carbon aerogels and activated carbon fibers (ACF's), both of which contain ultrafine pores and grains, the size of which can be controlled by the sample preparation procedures. The exp[-(T0/T)1/2] temperature dependence observed at low temperature in the dc electrical conductivity of both materials is characteristic of granular metallic systems. A variable-range hopping mechanism near a Coulomb gap around the Fermi level is proposed to circumvent the difficulties of previous tunneling and hopping models. The temperature dependence of the magnetoresistance in fields up to 15 T is measured for both aerogels and ACF's to further confirm the effect of the Coulomb gap. The results not only qualify porous materials as a medium for studying localization phenomena, but also shed some light on the complex problem of transport near the percolation threshold in granular metallic systems in general. C1 MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. MIT, FRANCIS BITTER NATL MAGNET LAB, CAMBRIDGE, MA 02139 USA. LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, LIVERMORE, CA 94550 USA. SHINSHU UNIV, COOPERAT RES CTR, MATSUMOTO, NAGANO 390, JAPAN. SHINSHU UNIV, FAC ENGN, MATSUMOTO, NAGANO 390, JAPAN. RP FUNG, AWP (reprint author), MIT, DEPT ELECT ENGN & COMP SCI, CAMBRIDGE, MA 02139 USA. NR 43 TC 71 Z9 72 U1 0 U2 7 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 JUN 15 PY 1994 VL 49 IS 24 BP 17325 EP 17335 DI 10.1103/PhysRevB.49.17325 PG 11 WC Physics, Condensed Matter SC Physics GA NW027 UT WOS:A1994NW02700050 ER PT J AU RUBIO, A ALONSO, JA LOPEZ, JM STOTT, MJ AF RUBIO, A ALONSO, JA LOPEZ, JM STOTT, MJ TI COLLECTIVE ELECTRONIC EXCITATIONS IN METAL-COATED C-60 SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; POTASSIUM CLUSTER IONS; FULLERENE MOLECULES; PLASMON EXCITATIONS; C-60 CLUSTERS; SURFACE; PHOTOABSORPTION; RESONANCES; PARTICLES; POLARIZABILITY AB A two-shell jellium-on-jellium model has been used to study the collective electronic excitations of C60 coated by an increasing number N of Na atoms. We predict a transition from the pi-electron polarization of the fullerene to the metallic sodium polarization as a function of increasing N. For low coverages, the Na layer produces only a broadening and fragmentation of the pi plasmon of C60. However, if the coverage is large enough, a Na surface plasmon appears. This occurs only after the electron density of the cluster clearly shows two distinct regions, the outer one having an ''average'' density similar to that in pure Na metal or Na clusters. The induced density at the collective-mode frequency shows structure corresponding to two interfaces, C60-Na and Na vacuum, the first peak becoming less pronounced as the coverage increases due to a transfer of oscillator strength to the metallic counterpart. The static polarizability per electron also shows this trend and tends slowly to the Na value from below after an initial sharp rise in the region N is similar to 13-21. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RI Lopez, Jose Manuel/I-5731-2013; Rubio, Angel/A-5507-2008; PNM, GIR/O-7902-2014; Alonso, Julio /D-5781-2016 OI Lopez, Jose Manuel/0000-0003-0995-0558; Rubio, Angel/0000-0003-2060-3151; Alonso, Julio /0000-0002-8604-8608 NR 38 TC 16 Z9 16 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 JUN 15 PY 1994 VL 49 IS 24 BP 17397 EP 17402 DI 10.1103/PhysRevB.49.17397 PG 6 WC Physics, Condensed Matter SC Physics GA NW027 UT WOS:A1994NW02700058 ER PT J AU XIU, RL AF XIU, RL TI WEAK SCALE MEASUREMENT CONSTRAINTS ON STRING MODELS SO PHYSICAL REVIEW D LA English DT Article ID GAUGE-SYMMETRY BREAKING; STANDARD-LIKE MODELS; SUPERSYMMETRY BREAKING; 4-DIMENSIONAL STRINGS; THRESHOLD CORRECTIONS; GRAND UNIFICATION; FLIPPED SU(5); ONE-LOOP; DUALITY; LEP AB The result of the modular-invariant one-loop string effective coupling constant for a large class of models is used to discuss the weak scale measurement constraints on superstring models. Superstring models with intermediate gauge symmetry breaking are proposed to account for the grand gauge unification scale M(GUT) = 10(16) GeV, which is deduced from the precision weak scale measurement in the minimal SUSY unification model. A gaugino-condensation-induced Hosotani mechanism is suggested for the intermediate gauge symmetry breaking. In this scheme, supergravity, gauge symmetry, and space-time compactification are induced by one nonperturbative dynamics: gaugino condensation. The string scale mu(s) is calculated in intermediate SU(5) string models. A relation between the intermediate gauge symmetry-breaking scale M(I) = M(GUT) and string scale is found to be mu(s)3 = M(I)m(P)2. It is argued that this relation is a general result for all the superstring models with intermediate gauge symmetry breaking. The level one minimal SUSY left-right string models are shown to be excluded by weak scale measurement. The constraints on the ratio of affine levels is worked out. It is demonstrated that string unification is more restricted by the experiments than any other unification schemes are. C1 LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. RP XIU, RL (reprint author), LAWRENCE BERKELEY LAB,DEPT PHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 37 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 JUN 15 PY 1994 VL 49 IS 12 BP 6656 EP 6662 DI 10.1103/PhysRevD.49.6656 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT526 UT WOS:A1994NT52600040 ER PT J AU WUNDERLICH, B JIN, YM BOLLER, A AF WUNDERLICH, B JIN, YM BOLLER, A TI MATHEMATICAL-DESCRIPTION OF DIFFERENTIAL SCANNING CALORIMETRY BASED ON PERIODIC TEMPERATURE MODULATION SO THERMOCHIMICA ACTA LA English DT Article ID HEAT-CAPACITY MEASUREMENTS; DSC AB The changes needed in the mathematical description of differential scanning calorimetry caused by periodical modulation of temperature are presented. Calibration procedures and possible extensions of the method are suggested, all based on the model of scanning calorimetry without temperature gradient within the sample. The basic differential equation for heat flow under modulation conditions is solved and the steady state identified. The main advantage of modulated differential thermal analysis is the elimination of nonperiodic heat losses and gains. It is suggested that the precision of heat capacity measurement may be increased by a factor of 10 using proper calibration. The thermal analysis in transition regions is discussed. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP WUNDERLICH, B (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 26 TC 374 Z9 377 U1 3 U2 31 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD JUN 15 PY 1994 VL 238 BP 277 EP 293 DI 10.1016/S0040-6031(94)85214-6 PG 17 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA PC083 UT WOS:A1994PC08300012 ER PT J AU KELSON, I LEVY, Y NIR, D HAUSTEIN, PE AF KELSON, I LEVY, Y NIR, D HAUSTEIN, PE TI A MONOENERGETIC ELECTRON SOURCE GENERATED BY NUCLEAR STIMULATED DESORPTION SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID DELAYED DESORPTION AB A series of measurements of nuclear stimulated desorption was performed for Ru-103, using thin ruthenium films irradiated by thermal neutrons. The magnitude, time dependence and electric charge state of the outgoing Rh-103m flux was investigated. The utilization of monoenergetic electrons accompanying the Rh-103m decay for thin film thickness measurement is considered. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,IL-69978 TEL AVIV,ISRAEL. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP KELSON, I (reprint author), TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD JUN 14 PY 1994 VL 27 IS 6 BP 1087 EP 1091 DI 10.1088/0022-3727/27/6/001 PG 5 WC Physics, Applied SC Physics GA NT794 UT WOS:A1994NT79400001 ER PT J AU LOUBRIEL, GM ZUTAVERN, FJ HJALMARSON, HP GALLEGOS, RR HELGESON, WD OMALLEY, MW AF LOUBRIEL, GM ZUTAVERN, FJ HJALMARSON, HP GALLEGOS, RR HELGESON, WD OMALLEY, MW TI MEASUREMENT OF THE VELOCITY OF CURRENT FILAMENTS IN OPTICALLY TRIGGERED HIGH-GAIN GAAS SWITCHES SO APPLIED PHYSICS LETTERS LA English DT Article AB Pictures are presented of the time evolution of current filaments during optically triggered, high gain switching in GaAs. Two filaments are triggered with two laser diode arrays and the time delay between them is varied. When the filament that is triggered first crosses the switch the voltage drops and the other filament ceases to grow. By varying the delay between the lasers, the tip velocity is measured to be 2 +/- 1 x 10(9) cm/s, 100 times larger than the peak drift velocity of carriers in GaAs. This observation supports switching models that rely on carrier generation at the tip of the filament. RP LOUBRIEL, GM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 21 Z9 30 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 JUN 13 PY 1994 VL 64 IS 24 BP 3323 EP 3323 DI 10.1063/1.111266 PG 1 WC Physics, Applied SC Physics GA NQ979 UT WOS:A1994NQ97900041 ER PT J AU KRUSINELBAUM, L THOMPSON, JR WHEELER, R MARWICK, AD LI, C PATEL, S SHAW, DT AF KRUSINELBAUM, L THOMPSON, JR WHEELER, R MARWICK, AD LI, C PATEL, S SHAW, DT TI ENHANCEMENT OF PERSISTENT CURRENTS IN BI2SR2CACU2O8 TAPES WITH SPLAYED COLUMNAR DEFECTS INDUCED WITH 0.8 GEV PROTONS SO APPLIED PHYSICS LETTERS LA English DT Article ID THERMAL-NEUTRON IRRADIATION; HEAVY-ION IRRADIATION; CU-O CRYSTALS; CURRENT-DENSITY; BOSON LOCALIZATION; FLUX CREEP; SUPERCONDUCTORS; IRREVERSIBILITY; YBA2CU3O7; MAGNETIZATION AB Composite tapes of the superconductor Bi2Sr2CaCu2O8 on silver were irradiated with energetic light ions (0.8 GeV protons), creating extended splayed tracks approximately 7 nm in diameter via fission of Bi nuclei. Magnetic hysteresis indicates large enhancements of persistent currents J, especially at high fields and temperatures, and substantial expansion of the irreversible regime. The technique may be suitable for large scale applications due to the long range (approximately half meter) of fast protons. C1 UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. SUNY BUFFALO, NEW YORK STATE INST SUPERCONDUCT, BUFFALO, NY 14260 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. RP KRUSINELBAUM, L (reprint author), IBM RES, YORKTOWN HTS, NY 10598 USA. NR 27 TC 124 Z9 125 U1 0 U2 2 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 JUN 13 PY 1994 VL 64 IS 24 BP 3331 EP 3333 DI 10.1063/1.111269 PG 3 WC Physics, Applied SC Physics GA NQ979 UT WOS:A1994NQ97900044 ER PT J AU WANG, SJ ZUO, W CASSING, W AF WANG, SJ ZUO, W CASSING, W TI CORRELATION DYNAMICS OF GREEN-FUNCTIONS SO NUCLEAR PHYSICS A LA English DT Article ID DENSITY-MATRIX FORMALISM; HEAVY-ION REACTIONS; TRANSPORT-THEORY; PION SPECTRA; COLLISIONS; TRUNCATION; MATTER; MODEL AB We generalize the methods used in the theory of correlation dynamics and establish a set of equations of motion for many-body correlation Green functions in the nonrelativistic case. These nonlinear and coupled equations of motion describe the dynamical evolution of correlation Green functions of different order and transparently show how many-body correlations are generated by the different interaction terms in a genuine nonperturbative framework. The nonperturbative results of the conventional Green function theory are included in the present formalism as two limiting cases (the so-called ladder-diagram summation and ring-diagram summation) as well as the familiar correlation dynamics of density matrices in the equal-time limit. We present explicit expressions for three- and four-body correlation functions that can be used to dynamically restore the trace relations for spin-symmetric Fermi systems and study numerically the relative importance of two-, three- and four-body correlations for nuclear configurations close to the ground state. C1 UNIV GIESSEN, INST THEORET PHYS, D-35392 GIESSEN, GERMANY. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP WANG, SJ (reprint author), LANZHOU UNIV, DEPT MODERN PHYS, LANZHOU, PEOPLES R CHINA. NR 44 TC 26 Z9 29 U1 0 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 JUN 13 PY 1994 VL 573 IS 2 BP 245 EP 275 DI 10.1016/0375-9474(94)90170-8 PG 31 WC Physics, Nuclear SC Physics GA NU507 UT WOS:A1994NU50700004 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML 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 BAKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M 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 BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, 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 DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P 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 LINDNER, R LIPNIACKA, A 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 MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P 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 PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y 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 SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ 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, B 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 WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML 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 BAKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M 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 BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, 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 DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P 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 LINDNER, R LIPNIACKA, A 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 MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P 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 PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y 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 SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ 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, B 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 WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI SEARCH FOR THE STANDARD MODEL HIGGS-BOSON IN Z(0) DECAYS SO NUCLEAR PHYSICS B LA English DT Note ID LOWEST ORDER CALCULATIONS; MONTE-CARLO SIMULATION; LEP; COLLISIONS AB A search for the Standard Model Higgs boson was performed in the data sample of around 1 million hadronic Z0 decays recorded in 1991 and 1992 with the DELPHI detector at LEP. The Higgs boson was searched for through its production in association with either neutrinos, electrons or muons. Four low mass events remain after the selections in the charged leptonic channels, that are likely to be due to background, especially four fermion processes. These results restrict the mass of the Standard Model Higgs boson to be larger than 55.7 GeV/c2 at the 95% confidence level. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. CAS,INST PHYS,FZU,CS-18040 PRAGUE 8,CZECH REPUBLIC. INFN,I-16146 GENOA,ITALY. DUBNA JOINT INST NUCL RES,101000 MOSCOW,RUSSIA. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SEFT,SF-00014 HELSINKI,FINLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YL,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 07,F-75221 PARIS 05,FRANCE. UNIV LYON 1,INPL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. CHARLES UNIV,MFF NC,CS-18000 PRAGUE 08,CZECH REPUBLIC. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. INFN,I-00173 ROME,ITALY. CTR ETUD SACLAY,DAPNIA,DSM,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,INFN,I-00161 ROME,ITALY. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. UNIV UDINE,INST FIS,I-33100 UDINE,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. INFN,I-40126 BOLOGNA,ITALY. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,CNRS,IN2P3,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 06,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. SERPUKOV HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. INFN,I-10125 TURIN,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV FED RIO DE JANEIRO,ILHA FDN,BR-21945970 RIO JANEIRO,BRAZIL. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), LIP,IST,FCUL,AV ELIAS GARCIA 14-10,P-1000 LISBON,PORTUGAL. RI Nomerotski, Andrei/A-5169-2010; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; 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; 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; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Yip, Kin/D-6860-2013; OI Andreazza, Attilio/0000-0001-5161-5759; 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; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; Yip, Kin/0000-0002-8576-4311; PREST, MICHELA/0000-0003-3161-4454; 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 NR 19 TC 41 Z9 41 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN 13 PY 1994 VL 421 IS 1 BP 3 EP 37 DI 10.1016/0550-3213(94)90222-4 PG 35 WC Physics, Particles & Fields SC Physics GA NW817 UT WOS:A1994NW81700001 ER PT J AU DODELSON, S GYUK, G TURNER, MS AF DODELSON, S GYUK, G TURNER, MS TI IS A MASSIVE TAU-NEUTRINO JUST WHAT COLD DARK-MATTER NEEDS SO PHYSICAL REVIEW LETTERS LA English DT Article ID LARGE-SCALE STRUCTURE; INFLATIONARY UNIVERSE; COBE; SCENARIO; HOT; ANISOTROPIES; GALAXIES; MODELS; TESTS AB The cold dark matter scenario for structure formation in the Universe has many successes; however, when its spectrum of density perturbations is normalized to the Cosmic Background Explorer anisotropy measurement the level of inhomogeneity predicted on small scales is too large. This can be remedied by a tau neutrino of mass 1-10 MeV and lifetime 0.1-100 sec whose decay products include electron neutrinos because it allows the total energy density in relativistic particles to be doubled without interfering with nucleosynthesis. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP DODELSON, S (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 38 TC 55 Z9 55 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 JUN 13 PY 1994 VL 72 IS 24 BP 3754 EP 3757 DI 10.1103/PhysRevLett.72.3754 PG 4 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000003 ER PT J AU WEAVER, M ARISAKA, K ROBERTS, D SLATER, W BRIERE, RA CHEU, E HARRIS, DA ROODMAN, A SCHWINGENHEUER, B WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA MCFARLAND, KS RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T GU, P HAAS, P HOGAN, WP KIM, SK MATTHEWS, JN MYUNG, SS SCHNETZER, S SOMALWAR, SV THOMSON, GB ZOU, Y AF WEAVER, M ARISAKA, K ROBERTS, D SLATER, W BRIERE, RA CHEU, E HARRIS, DA ROODMAN, A SCHWINGENHEUER, B WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA MCFARLAND, KS RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T GU, P HAAS, P HOGAN, WP KIM, SK MATTHEWS, JN MYUNG, SS SCHNETZER, S SOMALWAR, SV THOMSON, GB ZOU, Y TI LIMIT ON THE BRANCHING RATIO OF K(L)-]PI(0)NU(NU)OVER-BAR SO PHYSICAL REVIEW LETTERS LA English DT Article ID DECAY AB We report on a search for the decay K(L) --> pi0nunuBAR by the Fermilab E799 Collaboration. The partial width for this mode is related in a calculable way to the CP violation parameters of the standard model. In particular, the decay K(L) --> pi0nunuBAR is predicted to proceed almost entirely via a direct CP violating amplitude. No events were observed, allowing us to set an upper limit on the branching ratio of B(K(L) --> pi0nunuBAR) < 5.8 x 10(-5) at the 90% confidence level. C1 UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. UNIV COLORADO,BOULDER,CO 80309. ELMHURST COLL,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,URBANA,IL 61801. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. RUTGER STATE UNIV,PISCATAWAY,NJ 08855. RP WEAVER, M (reprint author), UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024, USA. RI Briere, Roy/N-7819-2014; Kim, Sun Kee/G-2042-2015 OI Briere, Roy/0000-0001-5229-1039; Kim, Sun Kee/0000-0002-0013-0775 NR 13 TC 23 Z9 23 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 JUN 13 PY 1994 VL 72 IS 24 BP 3758 EP 3761 DI 10.1103/PhysRevLett.72.3758 PG 4 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000004 ER PT J AU LU, ZT BOWERS, CJ FREEDMAN, SJ FUJIKAWA, BK MORTARA, JL SHANG, SQ COULTER, KP YOUNG, L AF LU, ZT BOWERS, CJ FREEDMAN, SJ FUJIKAWA, BK MORTARA, JL SHANG, SQ COULTER, KP YOUNG, L TI LASER TRAPPING OF SHORT-LIVED RADIOACTIVE ISOTOPES SO PHYSICAL REVIEW LETTERS LA English DT Article ID ATOMS; BEAM AB We describe an experiment which demonstrates the feasibility of trapping significant quantities of short-lived radioactive atoms with laser light. A thermal beam of 22.5 sec half-life Na-21 atoms was produced on-line at the LBL 88'' Cyclotron. After decelerating the beam using a Zeeman-tuned slowing technique we stored about 4 x 10(3) Na-21 atoms in a magneto-optical trap. The number of trapped atoms is large enough to be used in experimental studies of the beta decay of Na-21. The basic method can be adapted for other rare isotopes. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ARGONNE NATL LAB,ARGONNE,IL 60439. RP LU, ZT (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 11 TC 72 Z9 72 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 13 PY 1994 VL 72 IS 24 BP 3791 EP 3794 DI 10.1103/PhysRevLett.72.3791 PG 4 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000012 ER PT J AU VU, BTV SZOKE, A LANDEN, OL AF VU, BTV SZOKE, A LANDEN, OL TI TIME-RESOLVED PROBING OF ELECTRON THERMAL TRANSPORT IN PLASMA PRODUCED BY FEMTOSECOND LASER-PULSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID DENSITY PLASMA; SHIFTS; REFLECTIVITY; CONDUCTIVITY; EXPANSION; MODEL AB We present the first direct evidence for a supersonically moving steep ionization front in a solid density hot plasma. The plasma was produced by irradiating a transparent solid target with 100 fsec laser pulses at a peak intensity of 5 x 10(14) W/cm2. Time-resolved measurements of reflectivity, transmissivity, and frequency shift of a probe light, incident on the rear of the plasma, showed rapid formation of an over-dense plasma layer with a steep gradient that penetrates supersonically into the bulk target. Calculations using a simple nonlinear heat wave model, driven by electron thermal transport, show good agreement with the experimental results. C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. RP VU, BTV (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 31 TC 29 Z9 29 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 JUN 13 PY 1994 VL 72 IS 24 BP 3823 EP 3826 DI 10.1103/PhysRevLett.72.3823 PG 4 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000020 ER PT J AU BURNS, AR JENNISON, DR STECHEL, EB LI, YS AF BURNS, AR JENNISON, DR STECHEL, EB LI, YS TI INTRAMOLECULAR MOTION DURING STIMULATED SURFACE PROCESSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID LASER-INDUCED INTERACTION; DOUBLE-RESONANCE; AMMONIA; DESORPTION; ADSORPTION; STATES; NH3; PHOTODESORPTION; GAAS(100); PT(111) AB Ammonia and deuterated ammonia exhibit an anomalously large isotope effect in their relative yields and rotational spinning energy for electron-stimulated desorption from Pt(111). Quantum-resolved desorption measurements and ab initio, two-dimensional, potential energy calculations suggest that the desorbate undergoes a geometry change (molecular inversion) induced by the excited state. Inverted molecules deexcite to a repulsive hard wall potential and desorb. In general, multidimensional potential energy surfaces determine the dynamics of stimulated surface processes. C1 BIOSYM TECHNOL INC,SAN DIEGO,CA 92121. RP BURNS, AR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Stechel, Ellen/B-1253-2012 NR 24 TC 45 Z9 45 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 JUN 13 PY 1994 VL 72 IS 24 BP 3895 EP 3898 DI 10.1103/PhysRevLett.72.3895 PG 4 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000038 ER PT J AU GERMAN, KAH WEARE, CB YARMOFF, JA AF GERMAN, KAH WEARE, CB YARMOFF, JA TI INNER-SHELL ELECTRON PROMOTION IN LOW-ENERGY LI+-AL(100) COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ATOM-SURFACE COLLISIONS; CHARGE-EXCHANGE; ALKALI ADSORBATES; ION-SCATTERING; NEUTRALIZATION; HE+; LI+; SPECTROSCOPY; CU(110) AB A previously unobserved inelastic excitation mechanism is reported for alkali ions scattered from a metal surface. Li 1s holes are generated via electron Promotion during hard binary collisions with surface Al atoms. Excited Li then resonantly neutralizes to form Li*(1s 2s2). These particles autoionize above the surface and are thus detected as ions. At large scattering angles, the majority of the singly scattered Li+ ions participate in this promotion process for incident energies of approximately 3 keV and higher. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP GERMAN, KAH (reprint author), UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521, USA. NR 16 TC 28 Z9 28 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 JUN 13 PY 1994 VL 72 IS 24 BP 3899 EP 3902 DI 10.1103/PhysRevLett.72.3899 PG 4 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000039 ER PT J AU LEE, DH KIVELSON, SA WANG, Z ZHANG, SC AF LEE, DH KIVELSON, SA WANG, Z ZHANG, SC TI QUANTUM PERCOLATION AND PLATEAU TRANSITIONS IN THE QUANTUM HALL-EFFECT - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID QUASI-PARTICLE CHARGE; ACTIVATED CONDUCTANCE; LIQUID C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP LEE, DH (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. RI Zhang, Shou-Cheng/B-2794-2010 NR 9 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 13 PY 1994 VL 72 IS 24 BP 3918 EP 3918 DI 10.1103/PhysRevLett.72.3918 PG 1 WC Physics, Multidisciplinary SC Physics GA NT460 UT WOS:A1994NT46000046 ER PT J AU CALEF, B REDONDO, A AF CALEF, B REDONDO, A TI INITIAL-STAGES OF ELECTROPHILIC SUBSTITUTION STUDIED WITH QUANTUM MOLECULAR-DYNAMICS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PARAMETERS AB We report molecular dynamics simulations of the initial step of electrophilic substitution in benzene. Forces are calculated at each time step using quantum mechanical methods. Comparison of the trajectories with classical calculations shows a striking difference. Whereas the classical trajectory shows a proton with no specific bonds, the quantum calculations exhibit a clear bond to one of the carbons, leading to a cyclohexadienyl cation, as expected from standard ideas derived from electrophilic substitution reactions. The simulations demonstrate that forces calculated from quantum mechanics 'on the fly' exhibit the proper chemical behavior when bonds are formed or broken. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 22 TC 5 Z9 5 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 JUN 10 PY 1994 VL 223 IS 1-2 BP 1 EP 6 DI 10.1016/0009-2614(94)00423-4 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NQ084 UT WOS:A1994NQ08400001 ER PT J AU DEBOER, J CLUBOK, K HALPERN, MB AF DEBOER, J CLUBOK, K HALPERN, MB TI LINEARIZED FORM OF THE GENERIC AFFINE-VIRASORO ACTION SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID CONFORMAL FIELD-THEORY; 2-D QUANTUM-GRAVITY; WESS-ZUMINO MODEL; 2 DIMENSIONS; CONSTRUCTION; QUANTIZATION AB Halpern and Yamron have given a Lorentz, conformal, and Diff S2-invariant world-sheet action for the generic irrational conformal field theory, but the action is highly nonlinear. In this paper, we introduce auxiliary fields to find an equivalent linearized form of the action, which shows in a very clear way that the generic affine-Virasoro action is a Diff S2-gauged WZW model. In particular, the auxiliary fields transform under Diff S2 as local Lie g x Lie g connections, so that the linearized affine-Virasoro action bears an intriguing resemblance to the usual (Lie algebra) gauged WZW model. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP DEBOER, J (reprint author), SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794, USA. NR 30 TC 9 Z9 9 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD JUN 10 PY 1994 VL 9 IS 14 BP 2451 EP 2466 PG 16 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA NR060 UT WOS:A1994NR06000004 ER PT J AU DIMRI, GP HARA, E CAMPISI, J AF DIMRI, GP HARA, E CAMPISI, J TI REGULATION OF 2 E2F-RELATED GENES IN PRESENESCENT AND SENESCENT HUMAN FIBROBLASTS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID TRANSCRIPTION FACTOR E2F; DIHYDROFOLATE-REDUCTASE PROMOTER; CYCLE-DEPENDENT GENES; CELL-CYCLE; BINDING PROTEIN; RETINOBLASTOMA PROTEIN; DIPLOID FIBROBLASTS; MURINE FIBROBLASTS; COMPLEX-FORMATION; GROWTH-FACTOR AB Several mammalian genes expressed in late G, are positively regulated by E2F, a heterodimeric transcription factor, Genes encoding two E2F proteins, E2F-1 and DP-1, were regulated differently during the cell cycle and replicative senescence of normal human fibroblasts. In presenescent cells, E2F-1 mRNA was cell-cycle regulated, appearing a few hours before S phase. Ey contrast, DP-1 mRNA was constitutively expressed, independent of position in the cell cycle. After a finite number of divisions, normal cells enter a state of irreversible growth arrest termed senescence. Many genes remain mitogen-inducible in senescent cells; there are, however, exceptions, including several late G(1) genes potentially regulated by E2F. Senescent cells expressed DP-1 at the presenescent level, but did not express E2F-1 mRNA. Senescent cells were also markedly deficient in E2F binding activity associated with the dihydrofolate reductase promoter. E2F-1 and DP-1 expression vectors only weakly induced DNA synthesis in quiescent or senescent human cells and immortal murine NIH3T3 cells, although the E2F-1 vector stimulated DNA synthesis in immortal murine A31 cells, and transactivated E2F-responsive promoters in NIH3T3 cells. The results suggest that senescent cells may fail to express late G, genes due to repression of E2F-1, leading to a deficiency of E2F activity. Furthermore, although E2F-1 stimulates DNA synthesis in some cells, other cells, including normal human fibroblasts, require additional factors. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CELL & MOLEC BIOL,BERKELEY,CA 94720. FU NIA NIH HHS [AG09909] NR 44 TC 99 Z9 101 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 JUN 10 PY 1994 VL 269 IS 23 BP 16180 EP 16186 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NQ729 UT WOS:A1994NQ72900037 PM 8206919 ER PT J AU TANAKA, K OHTA, K FRITZ, JS MATSUSHITA, S MIYANAGA, A AF TANAKA, K OHTA, K FRITZ, JS MATSUSHITA, S MIYANAGA, A TI SIMULTANEOUS ION-EXCLUSION CHROMATOGRAPHY CATION-EXCHANGE CHROMATOGRAPHY WITH CONDUCTIMETRIC DETECTION OF ANIONS AND CATIONS IN ACID-RAIN WATERS SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 6th International Ion Chromatography Symposium CY SEP 12-15, 1993 CL BALTIMORE, MD SP DIONEX CORP, MILLIPORE, WATERS CHROMATOG DIV ID ELUENT AB A simple, selective and sensitive method was investigated for simultaneously determining anions (Cl-, NO3-, SO42-) and cations (Na+, NH4+, K+, Mg2+, Ca2+) in acid rain and related environmental waters in central Japan. The method involves simultaneous ion-exclusion-cation-exchange chromatography with conductimetric detection on a polyacrylate weakly acidic cation-exchange resin column with a weak-acid eluent. With the weak-acid eluent (tartaric acid) both anions and cations were separated simultaneously, based on ion-exclusion and cation-exchange mechanism. Owing to the presence of H+ ions in the tartaric acid eluent, the detector response was positive for the anions and negative for the cations. Using a 5 mM tartaric acid-7.5% methanol-water eluent, good simultaneous separation and detection were achieved in about 30 min. The results indicated an ionic balance of about 100% between the anions (including HCO3-) and the cations (including H+). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. TOSOH CORP,TOKYO RES CTR,AYASE,KANAGAWA 252,JAPAN. RP TANAKA, K (reprint author), NATL IND RES INST NAGOYA,KITA KU,1-1 HIRATE CHO,NAGOYA,AICHI 462,JAPAN. NR 8 TC 64 Z9 67 U1 2 U2 9 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 JUN 10 PY 1994 VL 671 IS 1-2 BP 239 EP 248 DI 10.1016/0021-9673(94)80245-9 PG 10 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NT177 UT WOS:A1994NT17700034 ER PT J AU SHI, YC FRITZ, JS AF SHI, YC FRITZ, JS TI NEW ELECTROLYTE SYSTEMS FOR THE DETERMINATION OF METAL-CATIONS BY CAPILLARY ZONE ELECTROPHORESIS SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 6th International Ion Chromatography Symposium CY SEP 12-15, 1993 CL BALTIMORE, MD SP DIONEX CORP, MILLIPORE, WATERS CHROMATOG DIV ID SEPARATION; IONS AB Many +1 and +2 metal cations can be separated efficiently by CZE using lactic acid as a complexing reagent. Addition of a crown ether, as well as lactic acid, permits the separation of K+ and NH4+ in addition to the ions previously separated. The problem of determining trace amounts of metal ions in the presence of a very high concentration of another metal ion was also addressed. For example, a large Na+ peak (1000 ppm, w/w) covers up the peaks of Ca2+, Mg2+, Sr2+ and B2+ (1 ppm each). However, addition of increasing concentrations of methanol to the electrolyte permits complete resolution of Ca2+ and Mg2+ from the Na+. Further addition of a crown ether moves Sr2+ and Ba2+ to longer migration times and permits resolution of these ions as well. Separation of metal cations with slower complexation kinetics is possible under conditions where only the free metal ions are present. Aluminum(III) and vanadium(IV), along with several other metal ions, were separated at pH 3.2 using nicotinamide as a buffer component and as a reagent for indirect detection. 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. NR 24 TC 72 Z9 74 U1 2 U2 9 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 JUN 10 PY 1994 VL 671 IS 1-2 BP 429 EP 435 DI 10.1016/0021-9673(94)80270-X PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NT177 UT WOS:A1994NT17700059 ER PT J AU BENZ, NJ FRITZ, JS AF BENZ, NJ FRITZ, JS TI STUDIES ON THE DETERMINATION OF INORGANIC ANIONS BY CAPILLARY ELECTROPHORESIS SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 6th International Ion Chromatography Symposium CY SEP 12-15, 1993 CL BALTIMORE, MD SP DIONEX CORP, MILLIPORE, WATERS CHROMATOG DIV ID ELECTROOSMOTIC FLOW-CONTROL; FUSED-SILICA CAPILLARIES; APPLIED RADIAL VOLTAGE; ZONE ELECTROPHORESIS; CONDUCTIVITY DETECTION; SEPARATION; OPTIMIZATION; SELECTIVITY; PARAMETERS; SAMPLES AB In order to separate anions effectively it is usually necessary to eliminate or reverse the direction of electroosmotic flow (EOF) resulting from attraction of cations to the negatively charged surface of a silica capillary. Previous workers have accomplished this by adding a quaternary ammonium salt (Q(+)) as an EOF ''modifier''. Under typical experimental conditions, a concentration of Q(+) > 0.25 mM is required to reverse the EOF direction. Addition of a low percentage of 1-butanol to the aqueous electrolyte was found to reduce the EOF. A combination of butanol and a very low concentration of Q(+) (typically 0.03 mM) was found to be particularly effective in controlling EOF and in giving effective separations of complex mixtures of anions. The probable mechanism of the butanol-Q(+) effect is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 28 TC 55 Z9 55 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD JUN 10 PY 1994 VL 671 IS 1-2 BP 437 EP 443 DI 10.1016/0021-9673(94)80271-8 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NT177 UT WOS:A1994NT17700060 ER PT J AU GLENN, LA GOLDSTEIN, P AF GLENN, LA GOLDSTEIN, P TI SEISMIC DECOUPLING WITH CHEMICAL AND NUCLEAR-EXPLOSIONS IN SALT SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SALMON AB An extensive series of simulations was performed of underground explosions in salt, using both chemical and nuclear explosives. In both cases, the radius of the initial emplacement cavity was varied from the fully tamped configuration to as large as 80 m/kt1/3; when not fully tamped, the cavity was assumed initially to contain air at ambient temperature and pressure. In the nuclear source case, the simulations are shown to be in good agreement with the Salmon/Sterling events conducted by the United States and with recently released Russian data on a similar pair of explosions in an Azgir salt dome. Simulation of the U.S. Cowboy series of chemical explosions in a Louisiana salt mine are also shown to be in very good agreement with the experimental data; however, the constitutive model for the salt that best explains these data is different from that derived for Salmon; both salt models are amply supported by laboratory and field data. The main result of these simulations is that cavity decoupling with chemical explosives is much less efficient than with nuclear explosives. Although maximum decoupling factors, f(max) near 200 may be attainable with either of the two sources, the cavity size required to achieve this value appears to be >40 m/kt 1/3. For cavity radii half as large, f(max), is roughly 4 times lower with nuclear explosives, and lower by another factor of 4 with chemical sources. Moreover, if the initial cavity radius is a more modest 10 m/kt1/3, f(max) < 3 even with a nuclear source. RP GLENN, LA (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV EARTH SCI, MS 200, POB 808, LIVERMORE, CA 94550 USA. NR 24 TC 8 Z9 9 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JUN 10 PY 1994 VL 99 IS B6 BP 11723 EP 11730 DI 10.1029/94JB00497 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NT168 UT WOS:A1994NT16800008 ER PT J AU ARVIDSON, R BECKER, R SHANABROOK, A LUO, W STURCHIO, N SULTAN, M LOTFY, Z MAHMOOD, AM ELALFY, Z AF ARVIDSON, R BECKER, R SHANABROOK, A LUO, W STURCHIO, N SULTAN, M LOTFY, Z MAHMOOD, AM ELALFY, Z TI CLIMATIC, EUSTATIC, AND TECTONIC CONTROLS ON QUATERNARY DEPOSITS AND LANDFORMS, RED-SEA COAST, EGYPT SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID DATED CORAL REEFS; CONVECTION; UPLIFT; RIFT; SUEZ AB The degree to which local climatic variations, eustatic sea level fluctuations, and tectonic uplift have influenced the development of Quaternary marine and fluvial landforms and deposits along the Red Sea coast, Eastern Desert, Egypt was investigated using a combination of remote sensing and field data, age determinations of corals, and numerical simulations. False color composites generated from Landsat Thematic Mapper and SPOT image data, digital elevation models derived from stereophotogrammetric analysis of SPOT data, and field observations document that a approximately 10-km-wide swath inland from the coast is covered in many places with coalescing alluvial fans of Quaternary age. Wadis cutting through the fans exhibit several pairs of fluvial terraces, and wadi walls expose alluvium interbedded with coralline limestone deposits. three distinct coral terrace are evident along the coastline. Climatic, eustatic, and tectonic uplift controls on the overall system were simulated using a cellular automata algorithm with die following characteristics: (1) uplift as a function of position and time, as defined by the elevations and ages of corals; (2) climatic variations driven by insolation changes associated with Milankovitch cycles; (3) sea level fluctuations based on U/rh ages of coral terraces and eustatic data; and (4) parameterized fluvial erosion and deposition. Results imply that the fans and coralline limestones were generated in a setting in which the tectonic uplift rate decreased over the Quaternary to negligible values at present. Coralline limestones formed during eustatic highstands when alluvium was trapped upstream and wadis filled with debris. During lowstands, wadis cut into sedimentary deposits; coupled with continuing uplift, fans were dissected, leaving remnant surfaces, and wadirelated terraces were generated by down cutting. Only landforms from the past three to four eustatic sea level cycles (i.e., approximately 300 to 400 kyr) are likely to have survived erosion and deposition associated with fluvial processes. C1 EGYPTIAN GEOL SURVEY & MIN AUTHOR, CAIRO, EGYPT. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. AIN SHAMS UNIV, DEPT BIOL & GEOL SCI, CAIRO, EGYPT. RP ARVIDSON, R (reprint author), WASHINGTON UNIV, MCDONNELL CTR SPACE SCI, DIV EARTH & PLANETARY SCI, CAMPUS BOX 1169, 1 BROOKINGS DR, ST LOUIS, MO 63130 USA. RI Becker, Richard/A-9120-2010 OI Becker, Richard/0000-0003-2514-2040 NR 30 TC 11 Z9 12 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JUN 10 PY 1994 VL 99 IS B6 BP 12175 EP 12190 DI 10.1029/94JB00037 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NT168 UT WOS:A1994NT16800042 ER PT J AU LENHART, S PROTOPOPESCU, V AF LENHART, S PROTOPOPESCU, V TI OPTIMAL-CONTROL FOR PARABOLIC-SYSTEMS WITH COMPETITIVE INTERACTIONS SO MATHEMATICAL METHODS IN THE APPLIED SCIENCES LA English DT Article ID OPTIMAL DAMPING CONTROL AB We consider a two-dimensional parabolic system with general competitive interactions as a two-player game with conflicting objectives and with controls on the inhomogeneous (source) terms. We show the existence of an optimal solution of the game as the saddle point of a suitable objective functional. C1 UNIV TENNESSEE,DEPT MATH,KNOXVILLE,TN 37996. RP LENHART, S (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831, USA. NR 24 TC 9 Z9 9 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0170-4214 J9 MATH METHOD APPL SCI JI Math. Meth. Appl. Sci. PD JUN 10 PY 1994 VL 17 IS 7 BP 509 EP 524 DI 10.1002/mma.1670170703 PG 16 WC Mathematics, Applied SC Mathematics GA NR819 UT WOS:A1994NR81900002 ER PT J AU HOFFMAN, GG PRATT, LR AF HOFFMAN, GG PRATT, LR TI COMPARISON OF ELECTRON-DENSITY FUNCTIONAL MODELS SO MOLECULAR PHYSICS LA English DT Article ID CORRELATION-ENERGY; STATISTICAL-THEORY; GAS; EXCHANGE; APPROXIMATION; SYSTEMS; PROTON; ATOMS; POTENTIALS; HYDROGEN AB Calculations are presented of the distortion of the density of an electron gas due to the electrostatic field of a proton. Several models based upon the local density approximation (LDA) of density functional theory (linear response theory, Kohn-Sham (KS), optimized Thomas-Fermi theory (OTF), and OTF plus perturbative corrections) are compared with one another. These models, in turn, are compared with available results of quantum Monte Carlo (QMC) calculations for the same system. Comparison of the KS results with the OTF results shows a very reasonable agreement that seems to be progressively improvable. This provides encouragement for the application of the OTF model to condensed phase systems. The QMC calculations of the density do not agree well with the density functional results. The reasons for this poor agreement are not clear. This particular system is expected to be an ideal one for application of the LDA and, thus, the poor agreement is of fundamental importance. The lack of detail presented in the available QMC results leads us to conclude that the QMC calculations should be attempted again. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP FLORIDA INT UNIV, DEPT CHEM, MIAMI, FL 33199 USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 47 TC 9 Z9 9 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0026-8976 EI 1362-3028 J9 MOL PHYS JI Mol. Phys. PD JUN 10 PY 1994 VL 82 IS 2 BP 245 EP 261 DI 10.1080/00268979400100184 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NR804 UT WOS:A1994NR80400002 ER PT J AU KEANE, PM HINKS, DG GEISER, U WILLIAMS, JM AF KEANE, PM HINKS, DG GEISER, U WILLIAMS, JM TI SYNTHESIS, SINGLE-CRYSTAL STRUCTURE, AND SUPERCONDUCTIVITY OF THE RUBIDIUM-SUBSTITUTED LA2CUO4 SO PHYSICA C LA English DT Article ID LOW-TEMPERATURE SYNTHESIS; DIRECT PRECIPITATION; LA2-XMXCUO4 AB The new compound La2-xRbxCuO4 (x = 0.055(3)) has been synthesized through a low-temperature (<450-degrees-C) technique employing molten hydroxide salts. For rubidium-doped La2CuO4, RbOH acts not only as a low-temperature flux but also as a reactant that contributes the alkali metal to the final product. La1.945Rb0.055CuO4 crystallizes in the tetragonal space group D4h17-I4/mmm with two formula units in a cell of dimensions a = 3.7858(6) and c = 13.276(3) angstrom (T = 298 K). The structure has been determined by single-crystal X-ray diffraction methods. Superconductivity is observed for the first time in the La2-xRbxCuO4 system with a T(c onset) almost-equal-to 22 K for x = 0.055. This molten-salts method was also employed to synthesize single crystals of sodium- and potassium-substituted La2CuO4. These compounds exhibit superconductivity with a T(c onset) of approximately 28 and 20 K, respectively. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. RP KEANE, PM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 17 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 10 PY 1994 VL 226 IS 3-4 BP 353 EP 359 DI 10.1016/0921-4534(94)90216-X PG 7 WC Physics, Applied SC Physics GA NR995 UT WOS:A1994NR99500021 ER PT J AU TAO, HS DIEBOLD, U SHINN, ND MADEY, TE AF TAO, HS DIEBOLD, U SHINN, ND MADEY, TE TI SURFACE-CHEMISTRY OF PH3, PF3 AND PCL3 ON RU(0001) SO SURFACE SCIENCE LA English DT Article ID NEGATIVE-IONS; RH(100); ADSORPTION; DESORPTION; PT(111); CO; CHEMISORPTION; PHOTOELECTRON; ABSORPTION; PHOSPHINE AB The adsorption, desorption and decomposition of PH3, PF3 and PCl3 on Ru(0001) have been studied by soft X-ray photoelectron spectroscopy (SXPS) using synchrotron radiation. Due to large chemical shifts in the P 2p core levels, different phosphorus containing surface species can be identified. We find that PF3 adsorbs molecularly on Ru(0001) at 80 and 300 K. At 80 K, PH3 saturates the surface with one layer of atomic hydrogen, elemental phosphorus, subhydride (i.e., PH(x) (0 < x < 3)) and PH3, with a total phosphorus coverage of 0.4 ML. At 300 Y, PH3 decomposes into atomic hydrogen and elemental phosphorus with a phosphorus coverage of 0.8 ML. At 80 K, PCl3 adsorbs dissociatively into atomic chlorine, elemental phosphorus, PCl and possibly PCl2 and PCl3 in the first monolayer. Formation of multilayers of PCl3 is observed at 80 K. At 300 Y, PCl3 adsorbs dissociatively as atomic chlorine and elemental phosphorus with a saturation phosphorus coverage of 0.1 ML. The variation -in total phosphorus uptake at 300 K from PX3 (X = H, F and Cl) adsorption is a result of competition between site blocking by dissociation fragments and displacement reactions. Annealing surfaces with adsorbed phosphorus to 1000 K results in formation of Ru(z)P (z = 1 or 2), which is manifested by the chemical shifts in the P2p core level, as well as the P LVV Auger transition. The recombination of adsorbed phosphorus and adsorbed X (= H, F and Cl) from decomposition is also observed, but is a minor reaction channel on the surface. Thermochemical data are used to analyze the different stabilities of PX3 at 300 K, namely, PF3 adsorbs molecularly and PH3 and PCl3 dissociate completely. First, we compare the heat of molecular adsorption and the heat of dissociative adsorption of PX3 on Ru(0001), using an enthalpy approach, and find results consistent with experimental observations. Second, we compare the total bond energy difference between molecular adsorption and complete dissociation of PX3 on Ru(0001). In particular, we apply Shustorovich's bond-order conservation-Morse potential (BOC-MP) method to estimate the heat of adsorption for PH3 and PCl3 and the bond energies of the relaxed P-X bonds of the adsorbed PX3 on the surface. The bond strength difference among the relaxed P-X bonds (i.e., the relaxed P-F bond (475 kJ/mol) is much stronger than either the relaxed P-H bond (287 kJ/mol) or the relaxed P-Cl bond (288 kJ/mol)) suggests that PF3 is more stable than PH3 and PCl3 on Ru(0001) at 300 K. These values are used to evaluate the total bond energy differences between molecular adsorption and complete dissociation for each of the PX3, and the results agree with the experimental trends. C1 RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. SANDIA NATL LABS,DEPT SURFACE & INTERFACE SCI,ALBUQUERQUE,NM 87185. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RI Diebold, Ulrike/A-3681-2010 OI Diebold, Ulrike/0000-0003-0319-5256 NR 51 TC 12 Z9 12 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 10 PY 1994 VL 312 IS 3 BP 323 EP 344 DI 10.1016/0039-6028(94)90725-0 PG 22 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NT052 UT WOS:A1994NT05200008 ER PT J AU RODRIGUEZ, JA HRBEK, J AF RODRIGUEZ, JA HRBEK, J TI SYNERGISTIC INTERACTIONS IN TRIMETALLIC BONDING - A COMPARISON OF THE ZNNM/RU(001) (NM=CU, AG OR AU) SYSTEMS SO SURFACE SCIENCE LA English DT Article ID ELECTRONIC-STRUCTURE; CHEMICAL-PROPERTIES; INTERMETALLIC COMPOUNDS; BIMETALLIC SURFACES; THERMAL-DESORPTION; TRANSITION-METALS; ZN-AU; RU(001); FILMS; OXYGEN AB The properties of Ag-Zn alloy films on Ru(001) have been examined using thermal desorption spectroscopy and photoemission. The results were compared to those previously reported for Cu-Zn and Au-Zn alloys on Ru(001). For the Zn-noble-metal alloys, the mechanism of decomposition was always the same: evolution of Zn into gas phase, with the noble metal remaining solid. In thick alloys with a low concentration of Zn, the decomposition temperature of Ag-Zn (600 K) was lower than that of Cu-Zn (640 K) or Au-Zn (670 K). Alloy formation induced only small shifts (-0.2 to -0.3 eV) in the position of the Zn 2p, 3s and 3d levels. In contrast, the core and valence levels of the noble metals showed large shifts toward higher binding energy. For small amounts of Cu, Ag and Au dissolved in Zn multilayers, the shifts in the noble-metal core levels follow the sequence: Ag(3d5/2), 0.72 eV < Cu(2p3/2), 0.85 eV < Au(4f7/2), 1.40 eV. These shifts reflect a nd --> (n + 1 p rehybridization in the valence levels of the noble metal induced by the formation of bonds with Zn. Two-dimensional (2D) alloys of Zn and a noble metal in contact with Ru(001), theta(Zn) + theta(NM) less-than-or-equal-to 1, show Zn-Ru and Zn-NM bonds more stable than the corresponding bonds in Zn/Ru(001) or thick three-dimensional (3D) alloys. This phenomenon is caused by synergistic interactions that involve the Ru-Zn, Ru-NM and Zn-NM bonds. The strength of these interactions depends on the ability of the noble metal to form strong metal-metal bonds: Ag < Cu < Au. The supported 2D alloys show noble-metal core levels shifted toward lower binding energy with respect to those of thick 3D alloys. These shifts and the large thermal stability of the supported 2D alloys can be attributed to a cooperative charge transfer from Ru to Zn to the noble metal. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,POB 5000,UPTON,NY 11973, USA. RI Hrbek, Jan/I-1020-2013 NR 59 TC 16 Z9 16 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 JUN 10 PY 1994 VL 312 IS 3 BP 345 EP 360 DI 10.1016/0039-6028(94)90726-9 PG 16 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NT052 UT WOS:A1994NT05200009 ER PT J AU DURR, H BADDORF, AP AF DURR, H BADDORF, AP TI ANHARMONICITY AND VIBRATIONAL-RELAXATION ON THE CU(110)-(2X1)-O SURFACE SO SURFACE SCIENCE LA English DT Article ID ENERGY ION-SCATTERING; METAL-SURFACES; OXYGEN-CHEMISORPTION; ADSORBED MOLECULES; DYNAMIC BEHAVIOR; COPPER 110; RECONSTRUCTION; ADSORPTION AB The temperature-dependent energy shift and broadening of surface vibrations on the Cu(110)-(2 x 1)-O reconstructed surface have been studied between 100 and 600 K using high-resolution electron energy loss spectroscopy. Atomic motions involved in the observed vibrations were extracted from phonon slab calculations. The measured energy shifts are directly related to the anharmonicity of the potentials between the vibrating atoms and can be modeled with a simple Morse oscillator. By comparing to bulk phonon measurements, we find that both the oxygen-copper and copper-copper bonds at the surface have bulk-like anharmonicity. This is in contrast to the clean Cu(110) surface where strong anharmonicity is observed. Broadening observed in the oxygen-copper surface vibration can be explained by energy relaxation due to substrate anharmonicity. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP DURR, H (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Durr, Hermann/F-6205-2012; Baddorf, Arthur/I-1308-2016 OI Baddorf, Arthur/0000-0001-7023-2382 NR 30 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 10 PY 1994 VL 312 IS 3 BP 369 EP 376 DI 10.1016/0039-6028(94)90728-5 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NT052 UT WOS:A1994NT05200011 ER PT J AU PICOREL, R CHUMANOV, G COTTON, TM MONTOYA, G TOON, S SEIBERT, M AF PICOREL, R CHUMANOV, G COTTON, TM MONTOYA, G TOON, S SEIBERT, M TI SURFACE-ENHANCED RESONANCE RAMAN-SCATTERING SPECTROSCOPY OF PHOTOSYSTEM-II PIGMENT-PROTEIN COMPLEXES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BACTERIAL PHOTOSYNTHETIC MEMBRANES; B559 COMPLEX; CYTOCHROME-B-559; PHOTOINHIBITION; SILVER; PURIFICATION; ORIENTATION; CHLOROPHYLL; TOPOGRAPHY; ELECTRODES AB Three different photosystem II (PSII) pigment-protein complexes (D1-D2-Cyt b(559)-CP47, D1-D2-Cyt b(559), and CP47) isolated from spinach were studied by surface-enhanced resonance Raman scattering (SERRS) spectroscopy. Surface-enhanced Raman scattering (SERS) is a distance sensitive (on a 5-10-Angstrom scale) spectroscopic tool that can be used to examine structural properties of large biological molecules. It is demonstrated here that SERS can also be used to determine organizational relationships between different pigment-protein complexes. Strong SERRS spectra from the above PSII complexes before and after treatment with sodium dithionite were obtained on roughened Ag electrodes and in citrate-reduced Ag colloids. The D1-D2-Cyt b(559) complex adsorbs with the Cyt b(559) heme close to the surface in the colloid, whereas the complex adsorbs differently on the Ag electrode due to the differing surface properties of the two types of substrates. An analysis of the SERRS spectra led to the following conclusions: CP47 binds next to Cyt b(559) in the D1-D2-Cyt b(559)-CP47 complex and covers the heme, the Cyt b(559) heme is located closer to one side of the complex (the stromal side in the intact thylakoid membrane), and both Chl and beta-carotene molecules ace located closer to the opposite side of the complex. Assuming a barrel-shape structure for the pigment-protein complexes, the results imply that the complexes are oriented with the central axis perpendicular to the metal surface both in the colloids and on the electrodes. C1 NATL RENEWABLE ENERGY LAB,PHOTOCONVERS RES BRANCH,GOLDEN,CO 80401. CSIC,ESTAC EXPTL AULA DEI,E-50080 ZARAGOZA,SPAIN. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RI PICOREL, RAFAEL/K-7930-2014 OI PICOREL, RAFAEL/0000-0003-3791-129X NR 37 TC 24 Z9 24 U1 0 U2 15 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 JUN 9 PY 1994 VL 98 IS 23 BP 6017 EP 6022 DI 10.1021/j100074a031 PG 6 WC Chemistry, Physical SC Chemistry GA NQ725 UT WOS:A1994NQ72500031 ER PT J AU BRODSKY, SJ SCHLUMPF, F AF BRODSKY, SJ SCHLUMPF, F TI WAVE-FUNCTION-INDEPENDENT RELATIONS BETWEEN THE NUCLEON AXIAL-COUPLING G(A) AND THE NUCLEON MAGNETIC-MOMENTS SO PHYSICS LETTERS B LA English DT Article ID CONSTITUENT-QUARK-MODEL; FORM-FACTORS; SPIN; SCATTERING; PROTON; DYNAMICS; ROTATION AB We calculate the proton's magnetic moment mu(p) and its axial-vector coupling g(A) as a function of its Dirac radius R1 using a relativisitic three-quark model formulated on the light-cone. The relationship between mu(p) and g(A) is found to be independent of the assumed form of the light-cone wavefunction. At the physical radius R1 = 0.76 fm, one obtains the experimental values for both mu(p) and g(A), and the helicity carried by the valence u and d quarks are each reduced by a factor congruent-to 0.75 relative to their non-relativistic values. At large proton radius, mu(p) and g(A) are given by the usual non-relativistic formulae. At small radius, mu(p) becomes equal to the Dirac moment, as demanded by the Drell-Hearn-Gerasimov sum rule. In addition, as R1 --> 0, the constituent quark helicities become completely disoriented and g(A) --> 0. RP BRODSKY, SJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 31 TC 81 Z9 81 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 JUN 9 PY 1994 VL 329 IS 1 BP 111 EP 116 DI 10.1016/0370-2693(94)90525-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT010 UT WOS:A1994NT01000018 ER PT J AU RUTLEDGE, JC SHOURBAJI, AG HUGHES, LA POLIFKA, JE CRUZ, YP BISHOP, JB GENEROSO, WM AF RUTLEDGE, JC SHOURBAJI, AG HUGHES, LA POLIFKA, JE CRUZ, YP BISHOP, JB GENEROSO, WM TI LIMB AND LOWER-BODY DUPLICATIONS INDUCED BY RETINOIC ACID IN MICE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE PATTERN FORMATION; PREGASTRULATION DEVELOPMENT; DEVELOPMENTAL ABNORMALITIES ID ANOMALIES; DISORGANIZATION; EXPOSURE AB The zygote and subsequent preimplantation stages of early mammalian development are susceptible to certain chemical perturbations that cause abnormal development of the conceptus. In certain cases, disruption in patterns of gene expression could be a primary event leading to abnormal development. To investigate this hypothesis, we treated pregnant mice with hans-retinoic acid, a known modulator of gene expression. Treatments were administered at various times during pregastrulation stages and the presumed onset of gastrulation. trans-Retinoic acid induced a distinctive set of malformations, as manifest by supernumerary and ectopic limbs and duplication of portions of the lower body, but only when administered during the period of 4.5-5.5 days after mating. (Other malformations were induced at different stages.) The limb and lower-body duplications suggest that exogenous trans-retinoic acid may influence not only the pattern for the hindlimbs but also that for the entire lower body. Since it appears likely that the embryos were affected in the late blastocyst and proamniotic-embryo stages, the provocative possibility arises that aspects of pattern formation of limbs and lower body actually occur prior to gastrulation. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. CHILDRENS HOSP & MED CTR,DEPT LAB MED,SEATTLE,WA 98105. UNIV WASHINGTON,SCH MED,TERATOGEN INFORMAT SYST PROJECT,SEATTLE,WA 98105. OBERLIN COLL,DEPT BIOL,OBERLIN,OH 44074. NIEHS,RES TRIANGLE PK,NC 27709. FU NIEHS NIH HHS [Y01-ES-20085] NR 14 TC 85 Z9 88 U1 1 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 JUN 7 PY 1994 VL 91 IS 12 BP 5436 EP 5440 DI 10.1073/pnas.91.12.5436 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NR275 UT WOS:A1994NR27500046 PM 8202504 ER PT J AU MAROTI, P HANSON, DK BACIOU, L SCHIFFER, M SEBBAN, P AF MAROTI, P HANSON, DK BACIOU, L SCHIFFER, M SEBBAN, P TI PROTON CONDUCTION WITHIN THE REACTION CENTERS OF RHODOBACTER-CAPSULATUS - THE ELECTROSTATIC ROLE OF THE PROTEIN SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE PHOTOCHEMICAL REACTION CENTER; PROTON TRANSFER; ELECTRON TRANSFER; SITE-SPECIFIC MUTAGENESIS ID BACTERIAL REACTION CENTERS; PHOTOSYNTHETIC REACTION-CENTER; ACCEPTOR QUINONE COMPLEX; SITE-DIRECTED MUTANTS; 2 IONIZABLE RESIDUES; QB-BINDING-SITE; RHODOPSEUDOMONAS-VIRIDIS; SECONDARY QUINONE; 2ND-SITE MUTATION; WILD-TYPE AB Light-induced charge separation in the photosynthetic reaction center results in delivery of two electrons and two protons to the terminal quinone acceptor Q(B). In this paper, we have used flash-induced absorbance spectroscopy to study three strains that share identical amino acid sequences in the Q(B) binding site, all of which lack the protonatable amino acids Glu-L212 and Asp-L213. These strains are the photosynthetically incompetent site-specific mutant Glu-L212/Asp-L213 --> Ala-L212/Ala-L213 and two different photocompetent derivatives that carry both alanine substitutions and an intergenic suppressor mutation located far from Q(B) (class 3 strain, Ala-Ala + Arg-M231 --> Leu; class 4 strain, Ala-Ala + Asn-M43 --> Asp). At pH 8 in the double mutant, we observe a concomitant decrease of nearly 4 orders of magnitude in the rate constants of second electron and proton transfer to Q(B) compared to the wild type. Surprisingly, these rates are increased to about the same extent in both types of suppressor strains but remain >2 orders of magnitude smaller than those of the wild type. In the double mutant, at pH 8, the loss of Asp-L213 and Glu-L212 leads to a substantial stabilization (greater than or equal to 60 meV) of the semiquinone energy level. Both types of compensatory mutations partially restore, to nearly the same level, the original free-energy difference for electron transfer from primary quinone Q(A) to Q(B) The pH dependence of the electron and proton transfer processes in the double-mutant sind the suppressor strains suggests that when reaction centers of the double mutant are shifted to lower pH (1.5-2 units), they function like those of the suppressor strains at physiological pH. Our data suggest that the main effect of the compensatory mutations is to partially restore the negative electrostatic environment of Q(B) and to increase an apparent ''functional'' pK of the system for efficient proton transfer to the active site. This emphasizes the role of the protein in tuning the electrostatic environment of its cofactors and highlights the possible long-range electrostatic effects. C1 CNRS,CTR GENET MOLEC,F-91198 GIF SUR YVETTE,FRANCE. ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. FU NIGMS NIH HHS [GM36598] NR 19 TC 56 Z9 56 U1 1 U2 3 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 JUN 7 PY 1994 VL 91 IS 12 BP 5617 EP 5621 DI 10.1073/pnas.91.12.5617 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NR275 UT WOS:A1994NR27500083 PM 8202536 ER PT J AU VELSKO, SP EBBERS, CA COMASKEY, B ALBRECHT, GF MITCHELL, SC AF VELSKO, SP EBBERS, CA COMASKEY, B ALBRECHT, GF MITCHELL, SC TI 100 W AVERAGE POWER AT 0.53 MU-M BY EXTERNAL FREQUENCY-CONVERSION OF AN ELECTROOPTICALLY Q-SWITCHED DIODE-PUMPED POWER OSCILLATOR SO APPLIED PHYSICS LETTERS LA English DT Article AB We have generated approximately 100 W of frequency doubled light from the output of an electro-optically Q-switched diode-pumped Nd:YAG slab laser oscillator operating at an average power of 200 W (2.5 kHz repetition rate, 80 mJ/pulse, 30 ns pulsewidth). The Q-switch was a compensated z-axis propagation LiNbO3 electro-optic modulator, and the frequency conversion crystal was a thin slab of KTP. In addition, Q-switched operation at an average power of approximately 250 W with 26 ns pulsewidths has been demonstrated. RP VELSKO, SP (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,7000 EAST AVE,LIVERMORE,CA 94550, USA. NR 9 TC 8 Z9 9 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 6 PY 1994 VL 64 IS 23 BP 3086 EP 3088 DI 10.1063/1.111355 PG 3 WC Physics, Applied SC Physics GA NP752 UT WOS:A1994NP75200008 ER PT J AU HUMMER, G SOUMPASIS, DM NEUMANN, M AF HUMMER, G SOUMPASIS, DM NEUMANN, M TI COMPUTER-SIMULATION OF AQUEOUS NA-CL ELECTROLYTES SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article; Proceedings Paper CT 2nd Liquid Matter Conference of the European-Physical-Society CY SEP 18-22, 1993 CL FLORENCE, ITALY SP EUROPEAN PHYS SOC, COMUNE FIRENZE, COMUNITA ECON EUROPEA, CNR, CONSORZIO INTERUNIV FISMAT, DB ELECTR INSTRUMENTS COHERENT, UNIV FIRENZE, DIPT FIS, CNR, GRP NAZL STRUTTURA MAT, INT SCI FDN, NEW YORK, CNR, IST ELETTR QUANTIST, FIRENZE, MERIDIANA, MINIST UNIV RIC SCI & TECNOL, REG TOSCANA, UNICOOP FIRENZE, UNIV FIRENZE ID SPC WATER MODEL; PAIR CORRELATIONS; EXTENDED RISM AB The equilibrium structure of aqueous Na-Cl electrolytes in the concentration regime between 1 and 5 mol l-1 is studied by means of a molecular dynamics computer simulation using interaction-site descriptions of water and the ionic components. The electrostatic interactions are treated both with the newly developed charged-clouds scheme and with Ewald summation. In the case of a 5 mol l-1 electrolyte, the results for pair correlations obtained by the two methods are in excellent agreement. However, the charged-clouds technique is much faster than Ewald summation and makes simulations at lower salt concentrations feasible. It is found that both ion-water and ion-ion correlation functions depend only weakly on the ionic concentration. Sodium and chloride ions exhibit only a negligible tendency to form contact pairs. In particular, no chloride ion pairs in contact are observed. C1 MAX PLANCK INST BIOPHYS CHEM,MOLEK BIOL,D-37018 GOTTINGEN,GERMANY. UNIV VIENNA,INST EXPTL PHYS,A-1090 VIENNA,AUSTRIA. RP HUMMER, G (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP T10,MS K710,LOS ALAMOS,NM 87545, USA. RI Hummer, Gerhard/A-2546-2013 OI Hummer, Gerhard/0000-0001-7768-746X NR 8 TC 94 Z9 97 U1 0 U2 12 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUN 6 PY 1994 VL 6 SU 23 BP A141 EP A144 DI 10.1088/0953-8984/6/23A/018 PG 4 WC Physics, Condensed Matter SC Physics GA NT288 UT WOS:A1994NT28800019 ER PT J AU LEE, SH KOBERSTEIN, JT QUAN, X GANCARZ, I WIGNALL, GD WILSON, FC AF LEE, SH KOBERSTEIN, JT QUAN, X GANCARZ, I WIGNALL, GD WILSON, FC TI SPATIAL-DISTRIBUTION OF A MIDBLOCK-ASSOCIATING HOMOPOLYMER BLENDED INTO A TRIBLOCK COPOLYMER SO MACROMOLECULES LA English DT Article ID BLOCK COPOLYMERS AB The spatial distribution of a midblock associating homopolymer confined within the lamellar microdomain structure of a triblock copolymer is probed with small angle neutron scattering experiments. The materials examined are poly(stryrene-b-[saturated 1,2-butadiene]-b-styrene) triblock copolymers to which a low molecular weight poly(saturated 1,2-butadiene) homopolymer has been added. The butadienes are saturated with either hydrogen, deuterium, or mixtures of the two gases in order to vary their neutron scattering contrast with respect to polystyrene. The results of contrast matching experiments demonstrate that there is a strong tendency for the homopolymer to localize at the center of the midblock microdomain. Experimental scattering profiles are modeled using one-dimensional scattering density profiles in order to obtain a quantitative description of the blend morphologies. This modeling indicates that two distinct scenarios exist for homopolymer localization in a triblock copolymer: one wherein the microdomain structure contracts and a second wherein there is an expansion of the microdomain. Possible origins of this behavior are proposed on the basis of the consideration of the configurations available to the midblock sequence, that is, tie chains that traverse the midblock domain, or loops that enter and exit the midblock microdomain through the same interface. C1 UNIV CONNECTICUT,DEPT CHEM ENGN,STORRS,CT 06269. AT&T BELL LABS,MURRAY HILL,NJ 07974. OAK RIDGE NATL LAB,NCSASR,OAK RIDGE,TN 37830. WROCLAW TECH UNIV,PL-50370 WROCLAW,POLAND. DUPONT CO INC,WILMINGTON,DE 19880. RP KOBERSTEIN, JT (reprint author), UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269, USA. OI Wignall, George/0000-0002-3876-3244 NR 13 TC 16 Z9 16 U1 3 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUN 6 PY 1994 VL 27 IS 12 BP 3199 EP 3206 DI 10.1021/ma00090a013 PG 8 WC Polymer Science SC Polymer Science GA NQ241 UT WOS:A1994NQ24100013 ER PT J AU ELLIS, RK KUNSZT, Z LEVIN, EM AF ELLIS, RK KUNSZT, Z LEVIN, EM TI THE EVOLUTION OF PARTON DISTRIBUTIONS AT SMALL-X SO NUCLEAR PHYSICS B LA English DT Article ID DEEP-INELASTIC-SCATTERING; FREE GAUGE THEORIES; LEADING ORDER; QUANTUM CHROMODYNAMICS; ANOMALOUS DIMENSIONS; QCD PREDICTIONS; DENSITIES; BEHAVIOR; ENERGIES AB We investigate parton distributions at small x using moments of the Gribov-Lipatov-Altarelli-Parisi (GLAP) evolution equation with respect to x. In this representation the kernel of the GLAP equation contains singularities in the moment variable omega at omega = 0. We show that the importance of these singularities at small x depends on the form of the starting distributions. We examine the range of x in which the GLAP equation is valid. The restrictions on the range of x depend on the form of the starting distributions. We investigate whether the GLAP equation can be used to interpolate data in the HERA region. Results are given for the structure function F2 at small x. A possible method of determining the gluon distribution from F2 is discussed. C1 SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND. RP ELLIS, RK (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. RI Kunszt, Zoltan/G-3420-2013 NR 44 TC 100 Z9 100 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN 6 PY 1994 VL 420 IS 3 BP 517 EP 549 DI 10.1016/0550-3213(94)90076-0 PG 33 WC Physics, Particles & Fields SC Physics GA NV710 UT WOS:A1994NV71000004 ER PT J AU GYULASSY, M WANG, XN AF GYULASSY, M WANG, XN TI MULTIPLE COLLISIONS AND INDUCED GLUON BREMSSTRAHLUNG IN QCD SO NUCLEAR PHYSICS B LA English DT Article ID RELATIVISTIC NUCLEAR COLLISIONS; ENERGY-LOSS; PLASMA; MODEL; SCATTERING; TEMPERATURE; DEPENDENCE AB Induced soft gluon bremsstrahlung associated with multiple collisions is calculated via perturbative QCD. We derive the non-abelian analog of the Landau-Pomeranchuk effect that suppresses induced soft radiation with formation times exceeding the mean free path. The dependence of the suppression effect on the SU(N) representation of the jet parton as well as the kinematic variables is expressed through a radiation formation factor. The soft radiation with k(perpendicular-to) < mu, where mu is the infrared screening scale in the medium, is shown to lead to an approximately constant radiative energy loss per unit length. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP GYULASSY, M (reprint author), COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027, USA. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 41 TC 537 Z9 541 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN 6 PY 1994 VL 420 IS 3 BP 583 EP 614 DI 10.1016/0550-3213(94)90079-5 PG 32 WC Physics, Particles & Fields SC Physics GA NV710 UT WOS:A1994NV71000007 ER PT J AU BURK, B CRESPI, VH ZETTL, A COHEN, ML AF BURK, B CRESPI, VH ZETTL, A COHEN, ML TI RUBIDIUM ISOTOPE EFFECT IN SUPERCONDUCTING RB3C60 SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINGLE-CRYSTAL K3C60; METAL-DOPED C60; FULLERENE SUPERCONDUCTORS; DEPENDENCE AB We have measured the resistive superconducting transition temperature in C60 single crystals intercalated with isotopically pure Rb-87 and Rb-85 and with natural abundance rubidium. We obtain a rubidium isotope effect exponent of alpha(Rb) = -0.028 +/- 0.036, a result which implies that the Rb-C60 optic phonons play at most a minor role in the pairing mechanism of Rb3C60. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP BURK, B (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016; OI Zettl, Alex/0000-0001-6330-136X; Crespi, Vincent/0000-0003-3846-3193 NR 27 TC 40 Z9 40 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 JUN 6 PY 1994 VL 72 IS 23 BP 3706 EP 3709 DI 10.1103/PhysRevLett.72.3706 PG 4 WC Physics, Multidisciplinary SC Physics GA NP958 UT WOS:A1994NP95800020 ER PT J AU CROWELL, B CHOWDHURY, P FREEMAN, SJ LISTER, CJ CARPENTER, MP HENRY, RG JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y SORAMEL, F AF CROWELL, B CHOWDHURY, P FREEMAN, SJ LISTER, CJ CARPENTER, MP HENRY, RG JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y SORAMEL, F TI NOVEL DECAY MODES OF HIGH-K ISOMERS - TUNNELING IN A TRIAXIAL LANDSCAPE - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Article C1 YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. RP CROWELL, B (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Freeman, Sean/B-1280-2010; Carpenter, Michael/E-4287-2015 OI Freeman, Sean/0000-0001-9773-4921; Carpenter, Michael/0000-0002-3237-5734 NR 6 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 6 PY 1994 VL 72 IS 23 BP 3737 EP 3737 DI 10.1103/PhysRevLett.72.3737 PG 1 WC Physics, Multidisciplinary SC Physics GA NP958 UT WOS:A1994NP95800030 ER PT J AU CARLISLE, JA MILLER, T CHIANG, TC AF CARLISLE, JA MILLER, T CHIANG, TC TI EXTENDED PHOTOEMISSION FINE-STRUCTURE ANALYSIS OF THE SI(111)-(7X7) SURFACE CORE LEVELS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Article C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. RP CARLISLE, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,POB 808 L-370,LIVERMORE,CA 94550, USA. RI Chiang, Tai/H-5528-2011 NR 3 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 6 PY 1994 VL 72 IS 23 BP 3741 EP 3741 DI 10.1103/PhysRevLett.72.3741 PG 1 WC Physics, Multidisciplinary SC Physics GA NP958 UT WOS:A1994NP95800034 ER PT J AU NORTON, GA AF NORTON, GA TI THE DETERMINATION OF QUARTZ USING DIFFERENTIAL SCANNING CALORIMETRY SO THERMOCHIMICA ACTA LA English DT Article AB Based on the results of this feasibility study, differential scanning calorimetry appears to be a promising technique for determining quartz in powdered samples. The method can avoid interferences, uses relatively inexpensive equipment compared to many of the more conventional techniques, and requires minimal operator skill. For samples containing quartz only, the method has good precision and sensitivity and exhibits a linear response for a wide range (20-10 000 mug) of quartz contents. Although as little as 20 mug of quartz could be detected, the lower limit of detection was not determined. Also, estimates of accuracy and precision for quartz in sample mixtures are still needed. It is likely that optimization of instrumental and sample mounting parameters will result in improved peak response, detection limits, and precision. RP NORTON, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 12 TC 5 Z9 5 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD JUN 6 PY 1994 VL 237 IS 2 BP 295 EP 304 DI 10.1016/0040-6031(94)80187-8 PG 10 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA NW967 UT WOS:A1994NW96700010 ER PT J AU GOLSHANSHIRAZI, S GUIOCHON, G AF GOLSHANSHIRAZI, S GUIOCHON, G TI COMPARATIVE-EVALUATION OF ADSORPTION ENERGY-DISTRIBUTION FUNCTIONS OBTAINED BY ANALYTICAL AND NUMERICAL-METHODS SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article ID HETEROGENEOUS SURFACES; ISOTHERM DATA; CHROMATOGRAPHY; EQUATION; CAEDMON AB The adsorption energy distributions derived from the Adamson and Ling (AL), and the House and Jaycock HILDA numerical methods are compared with the Sips analytical solution, which is used as a benchmark for these numerical methods. Excellent agreement between the analytical and numerical methods is achieved provided that the isotherm data are measured over a wide range of adsorbate partial pressures, extending to near the saturation capacity. While a lack of accurate low-pressure data will merely result in an inaccurate energy distribution in the high-energy range, a lack of these high-pressure data may result in an entirely wrong energy distribution. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 33 TC 6 Z9 6 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 JUN 3 PY 1994 VL 670 IS 1-2 BP 1 EP 14 DI 10.1016/0021-9673(94)80275-0 PG 14 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NR679 UT WOS:A1994NR67900001 ER PT J AU SEABORG, GT AF SEABORG, GT TI SECRECY RUNS AMOK SO SCIENCE LA English DT Editorial Material C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP SEABORG, GT (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 3 PY 1994 VL 264 IS 5164 BP 1410 EP 1411 DI 10.1126/science.264.5164.1410 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NP221 UT WOS:A1994NP22100028 PM 17838423 ER PT J AU RODRIGUEZ, JA AF RODRIGUEZ, JA TI INTERACTIONS IN BIMETALLIC BONDING - ELECTRONIC AND CHEMICAL-PROPERTIES OF PDZN SURFACES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TRANSITION-METAL ATOMS; ULTRATHIN FILMS; CO CHEMISORPTION; NOBLE-METAL; ZN-AU; PHOTOEMISSION; ADSORPTION; RU(001); GROWTH; ALLOYS AB The properties of PdZn surfaces have been examined using thermal desorption mass spectroscopy, core- and valence-level photoemission, and CO chemisorption. The formation of Pd-Zn bonds increases the binding energy of the core and valence levels of Pd and reduces the binding energy of the core and valence levels of Zn. An equiatomic PdZn alloy exhibits a large depletion of Pd(4d) states near the Fermi level and a shift of similar to+0.7 eV in the binding energy of the Pd(3d) levels. Ab initio SCF calculations for the PdZn molecule and PdnZnn (n = 2-4) clusters show a decrease in the electron population of the Pd(4d) orbitals as a consequence of Pd(4d) --> Zn(4p) charge transfer and Pd(4d) --> Pd(5s,5p) rehybridization. These electron transfers reduce electron-electron repulsion within a Pd atom, shifting its core and valence levels toward higher binding energy. The electronic perturbations induced by Zn on Pd reduce the CO-chemisorption ability of Pd by weakening the Pd(4d)-CO(2 pi) bonding interactions. PdZn surfaces that are rich in Zn show Pd-CO bonds that are 12-16 kcal/mol weaker than those seen on pure Pd surfaces. The electronic and chemical perturbations observed after bonding Pd to Zn are as large as those found for Pd bonded to early-transition metals and much bigger than those found when Pd is bonded to late-transition metals. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 70 TC 90 Z9 90 U1 1 U2 27 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 JUN 2 PY 1994 VL 98 IS 22 BP 5758 EP 5764 DI 10.1021/j100073a031 PG 7 WC Chemistry, Physical SC Chemistry GA NP301 UT WOS:A1994NP30100031 ER PT J AU COPELAND, A LENNON, G AF COPELAND, A LENNON, G TI RAPID ARRAYED FILTER PRODUCTION USING THE ORCA ROBOT SO NATURE LA English DT Article RP COPELAND, A (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,L-452,LIVERMORE,CA 94550, USA. NR 8 TC 15 Z9 16 U1 2 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 2 PY 1994 VL 369 IS 6479 BP 421 EP 422 DI 10.1038/369421a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NP174 UT WOS:A1994NP17400063 PM 8196771 ER PT J AU DAVIDSON, S MURAYAMA, H OLIVE, KA AF DAVIDSON, S MURAYAMA, H OLIVE, KA TI ON PRESERVING A B+L ASYMMETRY PRODUCED IN THE EARLY UNIVERSE SO PHYSICS LETTERS B LA English DT Article ID BOSE-EINSTEIN CONDENSATION; NUMBER NON-CONSERVATION; BARYON-NUMBER; SYMMETRY-BREAKING; SUPERSTRING MODELS; GRAND UNIFICATION; GAUGE-THEORIES; BARYOGENESIS; MECHANISM; SPHALERON AB One of the most efficient mechanisms for producing the baryon asymmetry of the Universe is the decay of scalar condensates in a SUSY GUT as was first suggested by Affleck and Dine. We show that given a large enough asymmetry, the baryon number will be preserved down to low temperatures even if B - L = 0, because the baryon number carrying scalars form Bose condensates that give the W a mass. We derive the conditions on the condensate needed to suppress electroweak sphaleron interactions which would otherwise drive the baryon asymmetry to zero when B - L = 0. C1 LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. RP DAVIDSON, S (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. RI Murayama, Hitoshi/A-4286-2011 NR 43 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 2 PY 1994 VL 328 IS 3-4 BP 354 EP 359 DI 10.1016/0370-2693(94)91490-7 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT009 UT WOS:A1994NT00900017 ER PT J AU KHOZE, VV AF KHOZE, VV TI THE VACUUM THETA-ANGLE IS ZERO IN NON-ABELIAN GAUGE-THEORIES SO PHYSICS LETTERS B LA English DT Article AB We argue that gauge transformations with arbitrary fractional winding numbers should be allowed in a non-Abelian gauge theory. This eliminates the topological distinction between large and small gauge transformations. We prove that the states which satisfy the Gauss's law constraint are strictly invariant under gauge transformations, i.e. no phase shift occurs. In other words, the vacuum theta-angle is zero. Our observation does not resolve the strong CP problem. RP KHOZE, VV (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. OI Khoze, Valentin V/0000-0003-3006-4147 NR 5 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 2 PY 1994 VL 328 IS 3-4 BP 387 EP 391 DI 10.1016/0370-2693(94)91495-8 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT009 UT WOS:A1994NT00900022 ER PT J AU KOVNER, A KURZEPA, PS AF KOVNER, A KURZEPA, PS TI BOSONIZATION OF QED(3) WITH AN INDUCED CHERN-SIMONS TERM SO PHYSICS LETTERS B LA English DT Article ID DIMENSIONS; FERMIONS AB We extend the bosonization of (2 + 1)-dimensional QED with one fermionic flavor performed previously to the case of QED with an induced Chem-Simons term. The coefficient of this term is quantized: e2n/8pi, n is-an-element-of Z. The fermion operators are constructed in terms of the bosonic fields A(i) and E(i). The construction is similar to that in the n = 0 case. The resulting bosonic theory is Lorentz invariant in the continuum limit and has Maxwell's equations as its equations of motion. The algebra of bilinears exhibits nontrivial operatorial mixing with lower dimensional operators, which is absent for n = 0. RP KOVNER, A (reprint author), LOS ALAMOS NATL LAB,DIV THEORY,T-8,MS B-285,LOS ALAMOS,NM 87545, USA. NR 12 TC 6 Z9 6 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 JUN 2 PY 1994 VL 328 IS 3-4 BP 506 EP 512 DI 10.1016/0370-2693(94)91511-3 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NT009 UT WOS:A1994NT00900038 ER PT J AU HULL, TE FAIRGRIEVE, TF TANG, PTP AF HULL, TE FAIRGRIEVE, TF TANG, PTP TI IMPLEMENTING COMPLEX ELEMENTARY-FUNCTIONS USING EXCEPTION HANDLING SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE COMPLEX ELEMENTARY FUNCTIONS; IMPLEMENTATION AB Algorithms are developed for reliable and accurate evaluations of the complex elementary functions required in FORTRAN 77 and FORTRAN 90, namely, cabs, csqrt, cexp, clog, csin, and ccos. The algorithms are presented in a pseudocode that has a convenient exception-handling facility. A tight error bound is derived for each algorithm. Corresponding FORTRAN programs for an IEEE environment have also been developed to illustrate the practicality of the algorithms, and these programs have been tested very carefully to help confirm the correctness of the algorithms and their error bounds. The results of these tests are included in the paper, but the FORTRAN programs are not; the programs are available from Fairgrieve (tff@cs.toronto.edu). C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. RP HULL, TE (reprint author), UNIV TORONTO,DEPT COMP SCI,TORONTO M5S 1A4,ONTARIO,CANADA. NR 8 TC 10 Z9 10 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0098-3500 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD JUN PY 1994 VL 20 IS 2 BP 215 EP 244 DI 10.1145/178365.178404 PG 30 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA PE561 UT WOS:A1994PE56100004 ER PT J AU LUO, CP DAHMEN, U WESTMACOTT, KH AF LUO, CP DAHMEN, U WESTMACOTT, KH TI MORPHOLOGY AND CRYSTALLOGRAPHY OF CR PRECIPITATES IN A CU-0.33 WT-PERCENT CR ALLOY SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID FCC-BCC INTERFACES; INVARIANT LINE; CU; BOUNDARIES; MODEL; COHERENT AB Lath-shaped, faceted Cr-rich precipitates in a Cu-0.33 wt% Cr alloy were investigated by transmission electron microscopy. Their orientation relationship with the matrix was identical for all precipitates observed. One set of close-packed planes in the two phases were exactly parallel, with the close packed directions enclosing an angle of 0.5-degrees, a systematic deviation of 0.5-degrees from the Kurdjumov-Sachs orientation relationship, or 5.76-degrees from Nishiyama-Wassermann. The lath axis was aligned precisely with the [561]fBAR invariant line direction, located at the intersection of the close-packed planes (111)f parallel-to (110)b with the cone of unextended lines. In agreement with previous observations the dominant interface facet was found to be (3.1 3.5.5)f or approximately 2-degrees away from (335)f. All crystallographic measurements were in excellent agreement with the predictions of an invariant line strain model assuming the Bain correspondence and a pair of parallel close packed planes, but inconsistent with the theory of martensitic transformations. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, NATL CTR ELECTRON MICROSCOPY, BERKELEY, CA 94720 USA. NR 27 TC 70 Z9 81 U1 2 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1994 VL 42 IS 6 BP 1923 EP 1932 DI 10.1016/0956-7151(94)90017-5 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NM401 UT WOS:A1994NM40100015 ER PT J AU WILSON, RD AF WILSON, RD TI EXPLORE THE POTENTIAL OF CAPACITOR-DISCHARGE WELDING SO ADVANCED MATERIALS & PROCESSES LA English DT Article RP WILSON, RD (reprint author), US BUR MINES,ALBANY RES CTR,DEPT INTERIOR,1450 QUEEN AVE SW,ALBANY,OR 97321, USA. NR 0 TC 8 Z9 9 U1 0 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD JUN PY 1994 VL 145 IS 6 BP 93 EP 94 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA PP491 UT WOS:A1994PP49100008 ER PT J AU HEFNER, LL AF HEFNER, LL TI SECRET SCIENCE - FEDERAL-CONTROL OF SCIENCE AND TECHNOLOGY - FOERSTEL,HN SO AMERICAN ARCHIVIST LA English DT Book Review RP HEFNER, LL (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SOC AMER ARCHIVISTS PI CHICAGO PA SUITE 504, 600 S FEDERAL, CHICAGO, IL 60605 SN 0360-9081 J9 AM ARCHIVIST JI Am. Arch. PD SUM PY 1994 VL 57 IS 3 BP 570 EP 572 PG 3 WC History; Information Science & Library Science SC History; Information Science & Library Science GA RA074 UT WOS:A1994RA07400017 ER PT J AU HACKER, BC AF HACKER, BC TI INSIDE NASA - HIGH-TECHNOLOGY AND ORGANIZATIONAL-CHANGE IN THE UNITED-STATES SPACE PROGRAM - MCCURDY,HE SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD JUN PY 1994 VL 99 IS 3 BP 996 EP 996 DI 10.2307/2167953 PG 1 WC History SC History GA NT912 UT WOS:A1994NT91200187 ER PT J AU CONSTANTIN, MJ PENNINGTON, LA WILLIAMSON, CR FINN, MG WEITZMAN, DJ AF CONSTANTIN, MJ PENNINGTON, LA WILLIAMSON, CR FINN, MG WEITZMAN, DJ TI STATUS OF INDUSTRIAL-HYGIENE GRADUATE-EDUCATION AT UNITED-STATES INSTITUTIONS SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article AB This article summarizes information collected from a questionnaire distributed to 112 U.S. colleges and universities regarding graduate education programs in the field of industrial hygiene. Descriptive information, such as curriculum offered, university affiliation, faculty and student characteristics, and program size, shows the diversity in programs. Current enrollment and degree data are not available from any other source. Full-and part-time enrollment in 1991 is estimated to be 1585 students at the master's level and 103 students at the doctoral level. During the 1990-1991 academic year, an estimated 438 master's degrees and 20 doctoral degrees were granted. Collection of this information will provide baseline data for an annual collection of enrollment and degree data that can be used to establish trends in this field. C1 US DOE,OFF HLTH,DIV IND HYG PROGRAMS,WASHINGTON,DC 20585. RP CONSTANTIN, MJ (reprint author), OAK RIDGE INST SCI & EDUC,POB 117,OAK RIDGE,TN 37831, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD JUN PY 1994 VL 55 IS 6 BP 537 EP 545 DI 10.1202/0002-8894(1994)055<0537:SOIHGE>2.0.CO;2 PG 9 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA NN600 UT WOS:A1994NN60000007 ER PT J AU CISPER, ME EARL, WL NOGAR, NS HEMBERGER, PH AF CISPER, ME EARL, WL NOGAR, NS HEMBERGER, PH TI SILICA-FIBER MICROEXTRACTION FOR LASER-DESORPTION ION-TRAP MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID SOLID-PHASE MICROEXTRACTION; GAS-CHROMATOGRAPHY; OPTICAL FIBERS; WATER; SENSITIVITY; EXTRACTION; SURFACES; PROBE AB We have coupled sample collection by solid-phase microextraction on disposable fused silica optical fibers with analysis by laser desorption ion trap mass spectrometry for rapid screening of organic contaminants in complex matrices. Because the silica-fiber probe serves as both the sampling medium and the sample support for laser desorption, traditional methods of sample preparation are eliminated with the expected gains in speed aad simplicity. Pyrene was the benchmark compound in these experiments but we show that the technique is also applicable to other polycyclic aromatic hydrocarbons (PAHs) and semivolatile compounds, laser dyes, pesticides, and peptides. Derivatizing the silica fiber improves the analyte collection efficiency, and firing the laser during a ring electrode rf ramp promotes dependable trapping of laser-desorbed ions. C1 LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 32 TC 21 Z9 22 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 JUN 1 PY 1994 VL 66 IS 11 BP 1897 EP 1901 DI 10.1021/ac00083a020 PG 5 WC Chemistry, Analytical SC Chemistry GA NP020 UT WOS:A1994NP02000022 ER PT J AU BALDWIN, DP ZAMZOW, DS DSILVA, AP AF BALDWIN, DP ZAMZOW, DS DSILVA, AP TI AEROSOL MASS MEASUREMENT AND SOLUTION STANDARD ADDITIONS FOR QUANTITATION IN LASER-ABLATION INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID ELEMENTAL ANALYSIS; NORMALIZATION; PLUMES AB A new approach for quantitation in laser ablation-inductively coupled plasma atomic emission spectrometry (LA-ICPAES) is presented. A portion of the laser-ablated sample aerosol is diverted to an aerosol mass monitor to measure variations in the amount of sample ablated and transported to the ICP torch. This provides a normalization for variations in laser ablation efficiency due to changes in laser power and focus at the sample and variations in material transport out of the ablation cell and into the ICP torch. During the laser ablation sampling process, solution standards are nebulized and the aerosol is added to the laser-ablated aerosol to generate a standard addition curve for the analyte being determined. The standard addition procedure corrects for potential plasma-related matrix effects in the ICP emission signal resulting from the ablated sample, The precision of this method, for triplicate analyses far the determination of 16 elements is four glass samples, and the accuracy of this method relative to the nominal glass compositions are both approximately 10%. RP BALDWIN, DP (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 19 TC 36 Z9 37 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 JUN 1 PY 1994 VL 66 IS 11 BP 1911 EP 1917 DI 10.1021/ac00083a022 PG 7 WC Chemistry, Analytical SC Chemistry GA NP020 UT WOS:A1994NP02000024 ER PT J AU MITCHELL, T SACKS, J YLVISAKER, D AF MITCHELL, T SACKS, J YLVISAKER, D TI ASYMPTOTIC BAYES CRITERIA FOR NONPARAMETRIC RESPONSE-SURFACE DESIGN SO ANNALS OF STATISTICS LA English DT Article DE BAYESIAN DESIGN; ASYMPTOTICS; D-, G- AND A-OPTIMALITY; STATIONARY PROCESSES ID LINEAR-REGRESSION; MODELS AB This paper deals with Bayesian design for response surface prediction when the prior may be finite or infinite dimensional, the design space arbitrary. In order that the resulting problems be manageable, we resort to asymptotic versions of D-, G- and A-optimality. Here the asymptotics stem from allowing the error variance to be large. The problems thus elicited have strong game-like characteristics. Examples of theoretical solutions are brought forward, especially when the priors are stationary processes on an interval, and we give numerical evidence that the asymptotics work well in the finite domain. C1 NATL INST STAT SCI,RES TRIANGLE PK,NC 27709. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. NR 16 TC 16 Z9 17 U1 1 U2 2 PU INST MATHEMATICAL STATISTICS PI HAYWARD PA IMS BUSINESS OFFICE-SUITE 6 3401 INVESTMENT BLVD, HAYWARD, CA 94545 SN 0090-5364 J9 ANN STAT JI Ann. Stat. PD JUN PY 1994 VL 22 IS 2 BP 634 EP 651 DI 10.1214/aos/1176325488 PG 18 WC Statistics & Probability SC Mathematics GA PN357 UT WOS:A1994PN35700004 ER PT J AU ENZIEN, MV PICARDAL, F HAZEN, TC ARNOLD, RG FLIERMANS, CB AF ENZIEN, MV PICARDAL, F HAZEN, TC ARNOLD, RG FLIERMANS, CB TI REDUCTIVE DECHLORINATION OF TRICHLOROETHYLENE AND TETRACHLOROETHYLENE UNDER AEROBIC CONDITIONS IN A SEDIMENT COLUMN SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Note ID METHANOGENIC CONDITIONS; INSITU BIODEGRADATION; ENRICHMENT CULTURES; CHLORINATED ETHENES; MIXED CULTURE; DEGRADATION; BIOTRANSFORMATION; STRAIN; TRANSFORMATION; MINERALIZATION AB Biodegradation of trichloroethylene and tetrachloroethylene under aerobic conditions was studied in a sediment column. Cumulative mass balances indicated 87 and 90% removal for trichloroethylene and tetrachloroethylene, respectively. These studies suggest the potential for simultaneous aerobic and anaerobic biotransformation processes under bulk aerobic conditions. C1 WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29802. UNIV ARIZONA,DEPT CIVIL ENGN,TUCSON,AZ 85721. RI Hazen, Terry/C-1076-2012 OI Hazen, Terry/0000-0002-2536-9993 NR 31 TC 46 Z9 47 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD JUN PY 1994 VL 60 IS 6 BP 2200 EP 2204 PG 5 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA NN765 UT WOS:A1994NN76500077 PM 16349308 ER PT J AU TRULSON, MO LUECK, HB FRIEDRICH, DM AF TRULSON, MO LUECK, HB FRIEDRICH, DM TI PERFORMANCE OF A SPATIAL-FILTER-EQUIPPED SINGLE MONOCHROMATOR FOR RAMAN-SPECTROSCOPY SO APPLIED SPECTROSCOPY LA English DT Article DE INSTRUMENTATION, RAMAN; OPTICS; RAMAN SPECTROSCOPY ID REJECTION AB A technique for reducing stray-light artifacts in Raman spectroscopy is described. The performance of a spatial filter at the output of a single monochromator is reported. The filter reduces both the diffuse background and the scattered-light artifacts encountered in single monochromators while maintaining high luminous throughput. Unlike other wavelength-selective methods for rejecting laser-excitation light (such as use of holographic edge or notch filters), spatial filtering of scattering artifacts may be used with any excitation wavelength. This is an advantage for Raman spectroscopy in the quartz ultraviolet region where holographic filters are not yet available. The enhanced ability to observe low-wavenumber scattering with an optical multichannel detector on a single monochromator is a particular advantage of the method. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD JUN PY 1994 VL 48 IS 6 BP 720 EP 723 DI 10.1366/000370294774368910 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA NW363 UT WOS:A1994NW36300015 ER PT J AU DAI, S COFFIELD, JE MAMANTOV, G YOUNG, JP AF DAI, S COFFIELD, JE MAMANTOV, G YOUNG, JP TI REDUCTION OF FUSED-SILICA-FIBER RAMAN BACKGROUNDS IN HIGH-TEMPERATURE FIBEROPTIC RAMAN-SPECTROSCOPY VIA THE MEASUREMENT OF ANTI-STOKES-RAMAN SPECTRA SO APPLIED SPECTROSCOPY LA English DT Note DE FIBEROPTIC REMOTE SPECTROSCOPY; ANTI-STOKES RAMAN; FIBER SILICA BACKGROUND C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 16 TC 4 Z9 5 U1 0 U2 2 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD JUN PY 1994 VL 48 IS 6 BP 766 EP 768 DI 10.1366/000370294774368938 PG 3 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA NW363 UT WOS:A1994NW36300023 ER PT J AU WU, W LANAGAN, MT POEPPEL, RB WANG, B DANYLUK, S AF WU, W LANAGAN, MT POEPPEL, RB WANG, B DANYLUK, S TI EFFECT OF RESIDUAL-STRESS ON CRITICAL-CURRENT DENSITY OF YBA2CU3O7-X THICK-FILMS SO APPLIED SUPERCONDUCTIVITY LA English DT Article AB YBa2Cu3Ox films were fabricated on 10-cm-diameter polycrystalline MgO wafers by spray pryolysis of a metal acetate solution. In-plane residual stress of the films was obtained by shadow Moire interferometry and correlated with crack formation and critical current density. High tensile stresses (0.96 GPa) were measured at the wafer center and decreased toward the edge, which corresponded with the largest number of cracks and lowest critical current density at the wafer center. A major cause of the residual stress (0.5 GPa) was caused by a tetragonal-to-orthorhombic phase transition in YBa2Cu3Ox. C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT CIVIL ENGN MECH & MET,CHICAGO,IL 60680. NR 11 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD JUN PY 1994 VL 2 IS 6 BP 387 EP 390 DI 10.1016/0964-1807(94)90085-X PG 4 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA QA534 UT WOS:A1994QA53400002 ER PT J AU JOO, J SINGH, JP WARZYNSKI, T GROW, A POEPPEL, RB AF JOO, J SINGH, JP WARZYNSKI, T GROW, A POEPPEL, RB TI ROLE OF SILVER ADDITION ON MECHANICAL AND SUPERCONDUCTING PROPERTIES OF HIGH-T-C SUPERCONDUCTORS SO APPLIED SUPERCONDUCTIVITY LA English DT Article ID NEUTRON-DIFFRACTION; YBA2CU3O7-DELTA SUPERCONDUCTORS; BI2SR2CACU2OX; TEMPERATURE; FRACTURE; OXYGEN; DENSE; (BI AB The effect of silver additions on the mechanical and superconducting properties of sintered bulk YBa2Cu3O delta (YBCO), Bi2Sr1.7CaCu2O delta (BSCCO-2212), and Bi1.8Pb0.4Sr2.2Ca2Cu3O delta (BSCCO-2223) has been evaluated. Strength and fracture toughness of YBCO and BSCCO bars increased with increasing Ag content up to 30 vol. % Ag. Addition of 30 vol. % Ag to YBCO increased strength from 87 to 136 MPa and fracture toughness from 1.82 to 3.9 MPa root m. Addition of 30 vol. % Ag to 2212 and 2223 increased strength from 58 to 107 and 41 to 90 MPa, respectively. Corresponding increases in fracture toughness were from 1.89 to 2.79 and 1.09 to 1.94 MPa root m, respectively. These improvements in strength and fracture toughness are believed to be due to the presence of Ag particles that may induce compressive stresses in the superconducting matrix and resist crack propagation by pinning the propagating cracks. The values of strength and fracture toughness of BSCCO-30 vol. % Ag specimens are comparable to those of monolithic BSCCO obtained by sinter forging, hot pressing, and hot isostatic pressing. On the other hand, the hardness of YBCO and BSCCO decreased with increasing Ag contents because of the lower hardness of Ag. Addition of Ag showed no adverse effects on superconducting properties (J(c) and T-c) of YBCO or BSCCO superconductors. C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. NR 32 TC 37 Z9 37 U1 1 U2 11 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 JUN PY 1994 VL 2 IS 6 BP 401 EP 410 DI 10.1016/0964-1807(94)90087-6 PG 10 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA QA534 UT WOS:A1994QA53400004 ER PT J AU GORETTA, KC LANAGAN, MT BRENT, TJ DORRIS, SE JOO, J PICCIOLO, JJ SHEARER, RA SINGH, JP WASYLENKO, S WINANDY, PM WANG, XW YOUNGDAHL, CA POEPPEL, RB MILLER, DJ HOLESINGER, TG KOSTIC, P CHEN, N AF GORETTA, KC LANAGAN, MT BRENT, TJ DORRIS, SE JOO, J PICCIOLO, JJ SHEARER, RA SINGH, JP WASYLENKO, S WINANDY, PM WANG, XW YOUNGDAHL, CA POEPPEL, RB MILLER, DJ HOLESINGER, TG KOSTIC, P CHEN, N TI PROCESSING AND PROPERTIES OF BULK BISRCACUO SUPERCONDUCTORS SO APPLIED SUPERCONDUCTIVITY LA English DT Article ID CU-O SUPERCONDUCTOR; SINTER-FORGED (BI; MECHANICAL-PROPERTIES; CURRENT-DENSITY; MICROSTRUCTURE; BI2SR2CACU2OX; DENSIFICATION; CERAMICS AB We fabricated bulk Bi2Sr2CaCu2Ox (2212) bars by directional solidification and bulk (Bi,Pb)(2)Sr2Ca2Cu3Ox (2223) bars by cold isostatic pressing and sintering or by sinter forging. T-c values were 92 K for the 2212 and 106-110 K for the 2223. Maximum transport J(c) values at 77 K were 450 A/cm(2) for the 2212, 1000 A/cm(2) for the pressed and sintered 2223, and 8000 A/cm(2) for the sinter-forged 2223. The 2212 bars exhibited the lowest strength and fracture toughness, and the sinter-forged 2223 the highest strength and toughness. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. ILLINOIS SUPERCONDUCTOR CORP, EVANSTON, IL 60201 USA. RP GORETTA, KC (reprint author), ARGONNE NATL LAB, DIV ENERGY TECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 35 TC 19 Z9 19 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD JUN PY 1994 VL 2 IS 6 BP 411 EP 415 DI 10.1016/0964-1807(94)90088-4 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA QA534 UT WOS:A1994QA53400005 ER PT J AU ERMEL, RW KENNY, TP WONG, A SOLOMON, A CHEN, PP ROBBINS, DL AF ERMEL, RW KENNY, TP WONG, A SOLOMON, A CHEN, PP ROBBINS, DL TI PREFERENTIAL UTILIZATION OF A NOVEL V-LAMBDA-3 GENE IN MONOCLONAL RHEUMATOID FACTORS DERIVED FROM THE SYNOVIAL-CELLS OF RHEUMATOID-ARTHRITIS PATIENTS SO ARTHRITIS AND RHEUMATISM LA English DT Article ID POLYMERASE CHAIN-REACTION; VARIABLE REGION GENES; CD5+ B-CELLS; LIGHT-CHAINS; MOLECULAR CHARACTERIZATION; SEQUENCE-ANALYSIS; HYBRIDOMA CELLS; MIXED PRIMERS; GERMLINE GENE; VH GENE AB Objective. To further our understanding about the molecular genetics of rheumatoid factor (RF) in rheumatoid arthritis (RA). Methods. The heavy and light chain variable region (V) genes of 5 new human monoclonal IgM RFs were cloned and sequenced using the polymerase chain reaction and the dideoxynucleotide termination method. Results. The results reveal the recurrent usage in two RA patients of a novel V lambda 3 germline gene, designated Humlv3c93. Specifically, in 2 of 3 RFs (C93 and D53) from one patient, the light chains in the V lambda gene-encoded region were identical to each other and to the light chain of an RF (H4) from another patient. Serologically, the light chains of these 3 RFs were classified as members of the V lambda 3b sub-subgroup. Each of the RFs was encoded by a different VH gene. Both C93 and D53 bound specifically with human and rabbit IgG, whereas H4 was monospecific for rabbit IgG. Conclusion. Since the lv3c93 gene is not homologous to any reported V lambda sequence from natural autoantibodies, it is possible that lv3c93 may represent a disease-specific RE-related V lambda gene. Moreover, the amino acid sequence CSGGSCY in the third complementarity-determining regions of 2 of the RF heavy chains is encoded by the DLR2 gene segment and has been found C1 LAWRENCE LIVERMORE NATL LAB,SCH MED,DIV RHEUMATOL ALLERGY & CLIN IMMUNOL,DAVIS,CA 95616. UNIV TENNESSEE,MED CTR,KNOXVILLE,TN. FU NCI NIH HHS [CA-10056]; NIAMS NIH HHS [AR-39831] NR 41 TC 24 Z9 24 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0004-3591 J9 ARTHRITIS RHEUM JI Arthritis Rheum. PD JUN PY 1994 VL 37 IS 6 BP 860 EP 868 DI 10.1002/art.1780370614 PG 9 WC Rheumatology SC Rheumatology GA NP654 UT WOS:A1994NP65400014 PM 8003058 ER PT J AU DEY, A VANBREUGEL, WJM AF DEY, A VANBREUGEL, WJM TI BLUE OPTICAL CONTINUUM ASSOCIATED WITH A RADIO KNOT IN 3C346 SO ASTRONOMICAL JOURNAL LA English DT Article ID PKS 0521-36; 3C 264; GALAXIES; SPECTRUM; JET; POLARIZATION; TELESCOPE; EMISSION; SAMPLE; LOBE AB We report the discovery of extremely luminous near-UV continuum emission associated with a bright radio knot in the radio galaxy 3C346 (z=0.162). Photometric measurements from U and r' band images and longslit spectra show a spectral energy distribution that steepens at higher frequencies, with radio and optical spectral indices alpha(r)=-0.37+/-0.02 and alpha(o)=-1.8-0.2, respectively. Based on a comparison of the optical properties of this knot with other known cases of optical emission associated with radio structures, we conclude that the continuum emission is optical synchrotron radiation. Our observations are consistent with the suggestion that 3C346 is a foreshortened FR-11 radio galaxy with its radio axis oriented close to the line of sight. The optical and radio emission from the knot appear to be associated with a hotspot (at the end of a jet) on the near side. Finally, our U and r' images of 3C346 provide a striking illustration that the optical morphologies of nearby radio galaxies also depend upon wavelength and that studies of these objects are relevant to the interpretation of the alignment effect seen in high redshift radio galaxies. C1 UNIV CALIF SANTA CRUZ,LICK OBSERV,MT HAMILTON,CA 95140. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. ASSOCIATED UNIV RES ASTRON INC,NATL OPT ASTRON OBSERV,KITT PEAK NATL OBSERV,TUCSON,AZ. RP DEY, A (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,601 CAMPBELL HALL,BERKELEY,CA 94720, USA. NR 48 TC 21 Z9 21 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 JUN PY 1994 VL 107 IS 6 BP 1977 EP 1983 DI 10.1086/117009 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NN596 UT WOS:A1994NN59600006 ER PT J AU COMINSKY, L ROBERTS, M JOHNSTON, S AF COMINSKY, L ROBERTS, M JOHNSTON, S TI DETECTION OF X-RAY-EMISSION FROM THE PSR-1259-63 SS-2883 BINARY-SYSTEM SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; PULSARS, INDIVIDUAL (PSR-1259-63); STARS, EMISSION-LINE, BE; STARS, MASS LOSS; X-RAYS, STARS ID TRANSIENT A0538-66; PSR 1259-63; PULSAR; STARS; PULSATIONS; PHOTOMETRY; POPULATION; RADIATION; DISCOVERY; EINSTEIN AB Nonpulsed but variable X-ray emission has been detected from the binary system containing the radio pulsar PSR 1259-63 during two pointed ROSAT observations, taken 5 months apart. This 47.7 ms radio pulsar is in a highly eccentric (epsilon approximately 0.85) binary system with the 10-15 M. Be star SS 2883. It is the first radio pulsar found to be in a binary system with a massive main-sequence companion; it is also the most highly eccentric binary system known to contain a neutron star. The level of X-ray flux detected in the ROSAT observations has increased with orbital phase by a factor of at least 10 between 1992 February and 1993 February. The X-ray flux is significantly greater than expected from the Be star's corona and seems likely to originate either from low-level stellar wind accretion onto the neutron star or from the shock between the stellar wind and the relativistic pulsar wind. The system may be the progenitor of the more slowly rotating Be X-ray binary pulsar systems. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV SYDNEY,THEORET ASTROPHYS RES CTR,SYDNEY,NSW 2006,AUSTRALIA. RP COMINSKY, L (reprint author), SONOMA STATE UNIV,DEPT PHYS & ASTRON,ROHNERT PK,CA 94928, USA. OI Roberts, Mallory/0000-0002-9396-9720 NR 32 TC 46 Z9 46 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 JUN 1 PY 1994 VL 427 IS 2 BP 978 EP 983 DI 10.1086/174204 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NN739 UT WOS:A1994NN73900042 ER PT J AU HURLEY, K LI, P SOMMER, M SMETTE, A KOUVELIOTOU, C FISHMAN, G CLINE, T BOER, M NIEL, M LAROS, J KLEBESADEL, R FENIMORE, E AF HURLEY, K LI, P SOMMER, M SMETTE, A KOUVELIOTOU, C FISHMAN, G CLINE, T BOER, M NIEL, M LAROS, J KLEBESADEL, R FENIMORE, E TI THE OPTICAL AND X-RAY CONTENT OF THE 1992 MAY 1 GAMMA-RAY BURST ERROR BOX SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTEGRAL Workshop on the Multiwavelength Approach to Gamma-Ray Astronomy CY FEB 02-05, 1993 CL LES DIABLERETS, SWITZERLAND SP INT GAMMA RAY ASTROPHYS LAB DE GAMMA-RAYS, BURSTS ID COUNTERPART AB A gamma-ray burst which occurred on 1992 May 1 was observed by three spacecraft in the third interplanetary network, and rapidly localized to a small error box. The coordinates were promptly circulated to a wide astronomical community, and radio, optical, and X-ray counterpart searches were carried out. A weak X-ray source was found in the error box, and two radio sources were discovered outside the error box, but in alignment with the X-ray source. The X-ray source position contains approximately 25 optical objects down to 23d magnitude. We discuss the prospects for identifying the burster counterpart. C1 MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. EUROPEAN SO OBSERV,W-8046 GARCHING,GERMANY. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. CTR ETUD SPATIALE RAYONNEMENTS,F-31029 TOULOUSE,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HURLEY, K (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94708, USA. OI Boer, Michel/0000-0001-9157-4349 NR 9 TC 10 Z9 10 U1 0 U2 0 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 JUN PY 1994 VL 92 IS 2 BP 655 EP 657 DI 10.1086/192035 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NM319 UT WOS:A1994NM31900064 ER PT J AU VONBALLMOOS, P SMITHER, RK AF VONBALLMOOS, P SMITHER, RK TI A POSITRON-ANNIHILATION RADIATION TELESCOPE USING LAUE DIFFRACTION IN A CRYSTAL LENS SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTEGRAL Workshop on the Multiwavelength Approach to Gamma-Ray Astronomy CY FEB 02-05, 1993 CL LES DIABLERETS, SWITZERLAND SP INT GAMMA RAY ASTROPHYS LAB DE GAMMA-RAYS, OBSERVATIONS; INSTRUMENTATION, DETECTORS; TELESCOPES ID GALACTIC-CENTER REGION; RAY; LINE AB We present a new type of gamma-ray telescope featuring a Laue diffraction lens, a detector module with a 3 X 3 germanium array, and a balloon gondola stabilized to 5'' pointing accuracy. The instrument's lens is designed to collect 51 1 keV photons on its 150 cm2 effective area and focus them onto a small detector having only approximately 14 cm3 of equivalent volume for background noise. As a result, this telescope overcomes the mass-sensitivity impasse of present detectors where the collection area is identical to the detection area. The sensitivity of our instrument is anticipated to be 3 X 10(-5) photons cm-2 s-1 at 511 keV with an angular resolution of 15'' and an energy resolution of 2 keV. These features will allow us to resolve a possible narrow 51 1 keV both energetically and spatially within a Galactic center ''microquasar'' such as 1E 1740.7-2942 or GRS 1758-258. Besides the Galactic ''microquasar,'' other prime objectives include Cygnus X-1, X-ray binaries and pulsars. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP VONBALLMOOS, P (reprint author), CTR ETUD SPATIALE RAYONNEMENTS,9 AVE COLONEL ROCHE,F-31029 TOULOUSE,FRANCE. NR 18 TC 12 Z9 12 U1 0 U2 0 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 JUN PY 1994 VL 92 IS 2 BP 663 EP 669 DI 10.1086/192037 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NM319 UT WOS:A1994NM31900066 ER PT J AU BENKOVITZ, CM AF BENKOVITZ, CM TI TRENDS OF AIR-QUALITY AND ATMOSPHERIC DEPOSITION IN TOKYO - DISCUSSION SO ATMOSPHERIC ENVIRONMENT LA English DT Discussion RP BENKOVITZ, CM (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD JUN PY 1994 VL 28 IS 10 BP 1803 EP 1803 PG 1 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NT629 UT WOS:A1994NT62900009 ER PT J AU BENKOVITZ, CM AF BENKOVITZ, CM TI TRENDS OF AIR-QUALITY AND ATMOSPHERIC DEPOSITION IN TOKYO - DISCUSSION SO ATMOSPHERIC ENVIRONMENT LA English DT Discussion RP BENKOVITZ, CM (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD JUN PY 1994 VL 28 IS 10 BP 1803 EP 1803 PG 1 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NT629 UT WOS:A1994NT62900011 ER PT J AU WOLFF, JO AF WOLFF, JO TI REPRODUCTIVE SUCCESS OF SOLITARILY AND COMMUNALLY NESTING WHITE-FOOTED MICE AND DEER MICE SO BEHAVIORAL ECOLOGY LA English DT Article DE COMMUNAL NESTING; DELAYED DISPERSAL; EXTENDED FAMILIES; LIMITED SPACE; MICE; PEROMYSCUS; REPRODUCTIVE SUCCESS; TERRITORIALITY AB To determine the fitness consequences of communal nesting in white-footed mice, Peromyscus leucopus, and deer mice, P. maniculatus, I compared the reproductive success of field populations of females nesting solitarily, in communal groups of more than one female, in extended families of successive litters, and in communal groups with extended families. Mean first litter size of weanlings and juveniles greater-than-or-equal-to 6 weeks old did not differ significantly for pups raised under the four nesting situations. Similarly, for pups born into extended families, litter sizes of pups from second litters did not differ significantly from those of first litters or from pups born to solitarily nesting females. Delayed dispersal of juvenile females did not result in resource competition or inhibition of reproduction. Thus, reproductive success of females was not significantly affected by additional members in the nest. At least 26 of 28 communally nesting females were close relatives. Solitary nesting is the common breeding pattern in Peromyscus, and extended families and communal nesting are alternative reproductive tactics in response to limited space, delayed dispersal, and local grouping among related females. RP WOLFF, JO (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 0 TC 55 Z9 57 U1 2 U2 8 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 SN 1045-2249 J9 BEHAV ECOL JI Behav. Ecol. PD SUM PY 1994 VL 5 IS 2 BP 206 EP 209 DI 10.1093/beheco/5.2.206 PG 4 WC Behavioral Sciences; Biology; Ecology; Zoology SC Behavioral Sciences; Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology; Zoology GA NJ348 UT WOS:A1994NJ34800012 ER PT J AU GUZMANNOVOA, E PAGE, RE GARY, NE AF GUZMANNOVOA, E PAGE, RE GARY, NE TI BEHAVIORAL AND LIFE-HISTORY COMPONENTS OF DIVISION-OF-LABOR IN HONEY-BEES (APIS-MELLIFERA L) SO BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY LA English DT Article DE SOCIAL INSECTS; APIS MELLIFERA; DIVISION OF LABOR; GENETICS ID GENOTYPIC VARIABILITY; GENETIC DETERMINATION; TASK SPECIALIZATION; COLONY DEFENSE; SOCIAL INSECTS; CAPENSIS ESCH; SUPER-SISTERS; OF-LABOR; HYMENOPTERA; APIDAE AB Variability exists among worker honey bees for components of division of labor. These components are of two types, those that affect foraging behavior and those that affect life-history characteristics of workers. Variable foraging behavior components are: the probability that foraging workers collect (1) pollen only; (2) nectar only; and (3) pollen and nectar on the same trip. Life history components are: (1) the age the workers initiate foraging behavior; (2) the length of the foraging life of a worker; and (3) worker length of life. We show how these components may interact to change the social organization of honey bee colonies and the lifetime foraging productivity of individual workers. Selection acting on foraging behavior components may result in changes in the proportion of workers collecting pollen and nectar. Selection acting on life-history components may affect the size of the foraging population and the distribution of workers between within nest and foraging activities. We suggest that these components define possible sociogenic ''pathways'' through which colony-level natural selection can change social organization. These pathways may be analogous to developmental pathways in the morphogenesis of individual organisms because small changes in behavioral or life history components of individual workers may lead to major changes in the organizational structure of colonies. C1 LAWRENCE LIVERMORE NATL LAB,DEPT ENTOMOL,DAVIS,CA 95616. INIFAP,CENIFMA,JURICA CAMPESTRE 76030,QUERETARO,MEXICO. NR 44 TC 34 Z9 34 U1 0 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-5443 J9 BEHAV ECOL SOCIOBIOL JI Behav. Ecol. Sociobiol. PD JUN PY 1994 VL 34 IS 6 BP 409 EP 417 DI 10.1007/s002650050057 PG 9 WC Behavioral Sciences; Ecology; Zoology SC Behavioral Sciences; Environmental Sciences & Ecology; Zoology GA NU982 UT WOS:A1994NU98200004 ER PT J AU GARCIA, AE SOUMPASIS, DM JOVIN, TM AF GARCIA, AE SOUMPASIS, DM JOVIN, TM TI DYNAMICS AND RELATIVE STABILITIES OF PARALLEL-STRANDED AND ANTIPARALLEL-STRANDED DNA DUPLEXES SO BIOPHYSICAL JOURNAL LA English DT Article ID BASE-PAIRS; NUCLEIC-ACIDS; FORCE-FIELD; OLIGODEOXYRIBONUCLEOTIDE DUPLEX; CONFORMATIONAL FLEXIBILITY; CONFIGURATIONAL ENTROPY; IONIC INTERACTIONS; 2-DIMENSIONAL H-1; DOUBLE HELIX; NMR-SPECTRA AB The dynamics and stability of four DNA duplexes are studied by means of molecular dynamics simulations. The four molecules studied are combinations of 4, 15 bases long, single-stranded oligomers, Fl, F2, F3, and F4. The sequence of these single strand oligomers are chosen such that F1-F2 and F3-F4 form parallel (ps) DNA double helices, whereas F1-F4 and F2-F3 form antiparallel-stranded (aps) DNA double helices. Simulations were done at low (100 K) and room (300 K) temperatures. At low temperatures the dynamics are quasi-harmonic and the analysis of the trajectories gives good estimates of the low frequency vibrational modes and density of states. These are used to estimate the linear (harmonic) contribution of local fluctuations to the configurational entropy of the systems. Estimates of the differences in enthalpy between ps and aps duplexes show that aps double helices are more stable than the corresponding ps duplexes, in agreement with experiments. At higher temperatures, the distribution of the fluctuations around the average structures are multimodal and estimates of the configurational entropy cannot be obtained. The multi-basin, nonlinear character of the dynamics at 300 K is established using a novel method which extracts large amplitude nonlinear motions from the molecular dynamics trajectories. Our analysis shows that both ps DNA exhibit much larger fluctuations than the two aps DNA. The large fluctuations of ps DNA are explained in terms of correlated transitions in the beta, epsilon, and zeta backbone dihedral angles. C1 MAX PLANCK INST BIOPHYS CHEM,DEPT MOLEC BIOL,D-37078 GOTTINGEN,GERMANY. RP GARCIA, AE (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,T-10,MAIL STOP K710,LOS ALAMOS,NM 87545, USA. NR 67 TC 17 Z9 17 U1 1 U2 3 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD JUN PY 1994 VL 66 IS 6 BP 1742 EP 1755 PG 14 WC Biophysics SC Biophysics GA NN129 UT WOS:A1994NN12900003 PM 8075315 ER PT J AU STEVENSON, CL JOHNSON, RW VO-DINH, T AF STEVENSON, CL JOHNSON, RW VO-DINH, T TI SYNCHRONOUS LUMINESCENCE - A NEW DETECTION TECHNIQUE FOR MULTIPLE FLUORESCENT-PROBES USED FOR DNA-SEQUENCING SO BIOTECHNIQUES LA English DT Article ID LASER-INDUCED FLUORESCENCE; CAPILLARY GEL-ELECTROPHORESIS; OLIGONUCLEOTIDES; SPECTROSCOPY; GENOME AB A method of nonradioactive DNA sequencing, which has been marketed commercially, uses four different fluorescent tags to label DNA fragments and fixed-wavelength excitation/fluorescence detection of the labels. This study presents an alternative method of detection based on synchronous luminescence (SL), in which both excitation and emission wavelengths are scanned simultaneously. This approach has proven in the past to have significant advantages over fixed-wavelength luminescence in the analysis and identification of fluorescent analytes. In this paper, the utility of synchronous excitation was investigated as a method for DNA sequencing with fluorescent tags. A laser-based SL instrument, recently developed in this laboratory, was used to resolve the spectra of a mixture of the dyes used in the fluorescence-based sequencing scheme. A preliminary limit of detection of 720 zeptomoles (10(-21) M) of fluorescein isothiocyanate dye in solution was achieved with this instrument. The results presented here suggest that the SL technique could result in an increase in sensitivity and a decrease in error rate of identification during DNA sequencing. C1 OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 19 TC 13 Z9 13 U1 0 U2 2 PU BIOTECHNIQUES OFFICE PI NEW YORK PA 52 VANDERBILT AVE, NEW YORK, NY 10017 USA SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD JUN PY 1994 VL 16 IS 6 BP 1104 EP + PG 0 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NP970 UT WOS:A1994NP97000029 PM 8074876 ER PT J AU LYNAM, EB SIMON, SI ROCHON, YP SKLAR, LA AF LYNAM, EB SIMON, SI ROCHON, YP SKLAR, LA TI LIPOPOLYSACCHARIDE ENHANCES CD11B/CD18 FUNCTION BUT INHIBITS NEUTROPHIL AGGREGATION SO BLOOD LA English DT Article ID PAROXYSMAL-NOCTURNAL HEMOGLOBINURIA; BACTERIAL LIPOPOLYSACCHARIDE; L-SELECTIN; LEUKOCYTE ADHESION; BINDING-PROTEIN; FLOW-CYTOMETRY; BLOOD; MAC-1; ACTIVATION; INTEGRINS C1 UNIV NEW MEXICO,SCH MED,DEPT CYTOMETRY,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,NATL FLOW CYTOMETRY RESOURCE,LOS ALAMOS,NM. FU NCRR NIH HHS [RR 01315]; NHLBI NIH HHS [HL 43026]; NIGMS NIH HHS [GM 37696] NR 44 TC 37 Z9 38 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD JUN 1 PY 1994 VL 83 IS 11 BP 3303 EP 3311 PG 9 WC Hematology SC Hematology GA NN988 UT WOS:A1994NN98800026 PM 7514906 ER PT J AU GOLDSMITH, JEM BISSON, SE FERRARE, RA EVANS, KD WHITEMAN, DN MELFI, SH AF GOLDSMITH, JEM BISSON, SE FERRARE, RA EVANS, KD WHITEMAN, DN MELFI, SH TI RAMAN LIDAR PROFILING OF ATMOSPHERIC WATER-VAPOR - SIMULTANEOUS MEASUREMENTS WITH 2 COLLOCATED SYSTEMS SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID MOISTURE; AEROSOLS AB Raman lidar is a leading candidate for providing the detailed space- and time-resolved measurements of water vapor needed by a variety of atmospheric studies. Simultaneous measurements of atmospheric water vapor are described using two collocated Raman lidar systems. These lidar systems, developed at the NASA/Goddard Space Flight Center and Sandia National Laboratories, acquired approximately 12 hours of simultaneous water vapor data during three nights in November 1992 while the systems were collocated at the Goddard Space Flight Center. Although these lidar systems differ substantially in their design, measured water vapor profiles agreed within 0.15 g kg-1 between altitudes of 1 and 5 km. Comparisons with coincident radiosondes showed all instruments agreed within 0.2 g kg-1 in this same altitude range. Both lidars also clearly showed the advection of water vapor in the middle troposphere and the pronounced increase in water vapor in the nocturnal boundary layer that occurred during one night. C1 NASA,GODDARD SPACE FLIGHT CTR,HUGHES STX CORP,GREENBELT,MD 20771. RP GOLDSMITH, JEM (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 17 TC 24 Z9 24 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD JUN PY 1994 VL 75 IS 6 BP 975 EP 982 DI 10.1175/1520-0477(1994)075<0975:RLPOAW>2.0.CO;2 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NU745 UT WOS:A1994NU74500002 ER PT J AU HUDNUT, KW BOCK, Y CLINE, M FANG, P FENG, Y FREYMUELLER, J GE, X GROSS, WK JACKSON, D KIM, M KING, NE LANGBEIN, J LARSEN, SC LISOWSKI, M SHEN, ZK SVARC, J ZHANG, J AF HUDNUT, KW BOCK, Y CLINE, M FANG, P FENG, Y FREYMUELLER, J GE, X GROSS, WK JACKSON, D KIM, M KING, NE LANGBEIN, J LARSEN, SC LISOWSKI, M SHEN, ZK SVARC, J ZHANG, J TI COSEISMIC DISPLACEMENTS OF THE 1992 LANDERS EARTHQUAKE SEQUENCE SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID SAN-ANDREAS FAULT; GLOBAL POSITIONING SYSTEM; CRUSTAL DEFORMATION; 2-COLOR GEODIMETER; JUNE 1992; SOUTHERN CALIFORNIA; EASTERN CALIFORNIA; INTERFEROMETRY; STRESS; FIELD AB We present co-seismic displacement vectors derived from Global Positioning System (GPS) measurements of 92 stations in southern California. These GPS results are combined with five well-determined GPS displacement vectors from continuously tracking stations of the Permanent GPS Geodetic Array, as well as line-length changes from USGS Geodolite and two-color laser trilateration observations, to determine a self-consistent set of geodetic data for the earthquake. These combined displacements are modeled by an elastic dislocation representation of the primary fault rupture planes. On average, the model residuals are about twice the estimated measurement errors. C1 STANFORD UNIV, INST GEOL SCI, STANFORD, CA 94305 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV CALIF LOS ANGELES, DEPT EARTH & SPACE SCI, LOS ANGELES, CA 90024 USA. UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, IGPP, LA JOLLA, CA 92093 USA. RP HUDNUT, KW (reprint author), US GEOL SURVEY, PASADENA, CA 91106 USA. RI Jackson, David/A-9828-2008; Hudnut, Kenneth/B-1945-2009; Hudnut, Kenneth/G-5713-2010 OI Jackson, David/0000-0001-7913-5714; Hudnut, Kenneth/0000-0002-3168-4797; NR 48 TC 85 Z9 89 U1 0 U2 4 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 USA SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD JUN PY 1994 VL 84 IS 3 BP 625 EP 645 PG 21 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NQ993 UT WOS:A1994NQ99300012 ER PT J AU FISHER, SK DALLAS, CE JAGOE, C SMITH, MH BRISBIN, IL CHESSER, RK AF FISHER, SK DALLAS, CE JAGOE, C SMITH, MH BRISBIN, IL CHESSER, RK TI SOURCES OF ERROR ASSOCIATED WITH SAMPLE COLLECTION AND PREPARATION OF NUCLEATED BLOOD-CELLS FOR FLOW CYTOMETRIC ANALYSIS SO CELL BIOLOGY AND TOXICOLOGY LA English DT Article DE DNA; FLOW CYTOMETRY; GENOTOXICOLOGY; LARGEMOUTH BASS; RED BLOOD CELLS ID DNA ANALYSIS; POPULATIONS AB Analysis of cellular DNA content by flow cytometry has been used to detect genetic changes associated with exposure to environmental contaminants. In lower vertebrates, nucleated red blood cells can be collected for analysis without harm to the animal. Because erythrocytes sampled from an individual should have identical amounts of DNA, the coefficient of variation (CV) around the G0/G1 peak should be small. Increases in CV can indicate genetic aberrations, but may also be caused by sample handling and preparation or problems with instrumentation. To increase confidence in associating increases in CV with external causes, artifactual changes in CV due to sample treatment and instrument parameters should be identified and minimized. We assessed the effects of various sampling and handling protocols on the CV of nucleated blood cells collected from largemouth bass (Micropterus salmoides). We also compared the distribution of cells among the G0/G1, S, and G2/M phases of the cell cycle to see whether these were affected by sampling or treatment protocols. Groups of 7 fish were bled on 7 consecutive days, and blood from each fish was analyzed by flow cytometry when freshly collected, and after freezing for 1 hour or 10 days. The same fish were bled again over a consecutive 7-day period, and the experiment was repeated. CV and cell cycle distribution were not affected by our freezing protocol. Repeat sampling from the same individual did not affect CV, but altered the distribution of cells in the cell cycle, suggesting increased hemopoiesis in response to blood sampling. Day-to-day variation in the CV occurred in both fresh and frozen samples, probably as the result of small variations in instrument adjustments. These results demonstrate the suitability of this freezing protocol for these blood samples, and illustrate the importance of assessing sources of variation when using flow cytometry to screen wild populations in genotoxicological studies. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC. RP FISHER, SK (reprint author), UNIV GEORGIA,COLL PHARM,DEPT PHARMACOL & TOXICOL,ATHENS,GA 30602, USA. NR 24 TC 13 Z9 13 U1 1 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0742-2091 J9 CELL BIOL TOXICOL JI Cell Biol. Toxicol. PD JUN PY 1994 VL 10 IS 3 BP 145 EP 153 DI 10.1007/BF00757557 PG 9 WC Cell Biology; Toxicology SC Cell Biology; Toxicology GA NX529 UT WOS:A1994NX52900001 PM 7994631 ER PT J AU WILKINS, FW BLAKE, DM AF WILKINS, FW BLAKE, DM TI USE SOLAR-ENERGY TO DRIVE CHEMICAL PROCESSES SO CHEMICAL ENGINEERING PROGRESS LA English DT Article ID DESTRUCTION; IRRADIANCE C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO. RP WILKINS, FW (reprint author), US DOE,WASHINGTON,DC, USA. NR 25 TC 6 Z9 6 U1 0 U2 1 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0360-7275 J9 CHEM ENG PROG JI Chem. Eng. Prog. PD JUN PY 1994 VL 90 IS 6 BP 41 EP 49 PG 9 WC Engineering, Chemical SC Engineering GA NT294 UT WOS:A1994NT29400014 ER PT J AU LI, DQ BUSCHER, CT SWANSON, BI AF LI, DQ BUSCHER, CT SWANSON, BI TI SYNTHESIS, CHARACTERIZATION, AND PROPERTIES OF COVALENTLY BOUND, SELF-ASSEMBLED PORPHYRIN MULTILAYER THIN-FILMS SO CHEMISTRY OF MATERIALS LA English DT Article ID NORMAL COORDINATE ANALYSIS; LANGMUIR-BLODGETT FILMS; 2ND-HARMONIC GENERATION; HARMONIC-GENERATION; MONOLAYER MEMBRANES; PLANAR VIBRATIONS; SURFACE; SPECTRA; BENZENE; DYE AB The synthesis and characterization of covalently bound, self-assembled, multilayer thin films of 5,10,15,20-tetra-4-pyridyl-21H,23H-porphine (TPyP) on fused quartz substrates and the native oxide of silicon [100] surfaces are described. The surface-bound multilayer thin films were grown by anchoring TPyP to a [p-(chloromethyl)phenyl]trichlorosilane coupling layer (Cp) and then assembling the sequential TPyP layers via its pyridyl ''tether'' groups with alpha,alpha'-dichloro-p-xylene linkers (Ln) to form an alternating layered structure Cp(TPyPLn)n. These self-assembled thin films consist of conjugated porphyrin macrocycle disklike structures that were analyzed by UV-visible spectroscopy, X-ray photoelectron spectroscopy, secondary ion mass spectrometry, and polarized variable-angle, internal attenuated total reflection infrared (PVAI-ATR-IR) measurements. Surface acoustic wave (SAW) mass transduction and electronic absorption spectra reveal that the surface coverage of each layer is a densely packed monolayer (Cp 6.3 X 10(-7) mmol/cm2; TPyP 2.0 x 10(-7) mmol/cm2). Both the film thickness (t = 18 angstrom for each bilayer) and the average molecular orientation angle (psi = 43-degrees) of the surface bound chromophores were measured by the PVAI-ATR-IR technique, which are in excellent agreement with polarized, variable-angle second harmonic generation measurements. RP LI, DQ (reprint author), LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545, USA. NR 49 TC 25 Z9 25 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUN PY 1994 VL 6 IS 6 BP 803 EP 810 DI 10.1021/cm00042a017 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NT063 UT WOS:A1994NT06300017 ER PT J AU LUCAS, JN STRAUME, T AF LUCAS, JN STRAUME, T TI NONCANCER RELATED CHROMOSOME-TRANSLOCATION FREQUENCY MEASURED FROM A LEUKEMIA PATIENTS BLOOD SO CHINESE MEDICAL JOURNAL LA English DT Article; Proceedings Paper CT International Symposium on Biological Effects of Low Level Exposures to Radiation and Related Agents (ISBELLES 93) CY OCT 12-16, 1993 CL CHANGCHUN, PEOPLES R CHINA SP CHINESE SOC RADIOL MED & PROTECT, CHINESE MED ASSOC ID HYBRIDIZATION; RADIATION AB A new approach used to measure pre-cancer-induced genetic damage in a patient diagnosed as early B-precursor acute lymphoblastic leukemia, by totally separating the malignant B-lymphocytes and the normal T-lymphocytes is described. The lymphocytes separation by a rosetting method and chromosome translocation analysis using chromosome painting were employed. In the case presented here, the utility of this approach is illustrated using blood lymphocytes from a nuclear dockyard worker who claims that his leukemia was induced by work-related radiation exposures. Blood lymphocytes were obtained after diagnosis of the disease, but prior to therapy, and measurements made of (1) the translocation frequency in separated normal T-lymphocytes and (2) the translocation frequency in phytohemagglutinin (PHA) stimulated lymphocytes, which include a fraction of the malignant B cells. The approach described here makes possible biodosimetry of pre-cancer exposures in these patients and may provide the dosimetric information required to establish the ''probability of causation'' for the observed cancer. RP LUCAS, JN (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU CHINESE MEDICAL ASSOCIATION PI BEIJING PA 42 DONGSI XIDAJIE, BEIJING 100710, PEOPLES R CHINA SN 0366-6999 J9 CHINESE MED J-PEKING JI Chin. Med. J. PD JUN PY 1994 VL 107 IS 6 BP 411 EP 413 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA NX373 UT WOS:A1994NX37300003 PM 7956478 ER PT J AU HANDO, JC NATH, J TUCKER, JD AF HANDO, JC NATH, J TUCKER, JD TI SEX-CHROMOSOMES, MICRONUCLEI AND AGING IN WOMEN SO CHROMOSOMA LA English DT Article ID ANEUPLOIDY-INDUCING AGENTS; X-CHROMOSOME; HUMAN-LYMPHOCYTES; IMMUNOFLUORESCENCE; ASSAY; CELLS AB Several studies on aneuploidy and aging have shown a significant increase in the loss of chromosomes in both males and females with age. Others have observed a significant increase in micronucleus formation in lymphocytes with age. The objectives of this investigation were to determine the relationship between sex chromosome loss and increased micronucleus frequencies with age, to establish sex chromosome loss frequencies unbiased by cellular survival factors or slide preparation, and to determine the effect of smoking on sex chromosome loss. Blood samples were obtained from 8 newborn females and 38 adult females ranging in age from 19 to 77. Isolated lymphocytes were cultured according to standard techniques and blocked with cytochalasin B. Two thousand binucleated cells per donor were scored using a modified micronucleus assay to determine the kinetochore status of each micronucleus. Slides were then hybridized with a 2.0 kb centromeric X chromosome-specific probe labeled with biotinylated dUTP, and detected with fluorescein-conjugated avidin. All micronucleated cells were relocated and their X chromosome status was determined. We found the X chromosome to be present in 72.2% of the micronuclei scored; additionally our results show a significant increase with age in the number of micronuclei containing an X chromosome. C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551. W VIRGINIA UNIV,COLL AGR & FORESTRY,GENET & DEV BIOL PROGRAM,MORGANTOWN,WV 26506. NR 26 TC 106 Z9 108 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0009-5915 J9 CHROMOSOMA JI Chromosoma PD JUN PY 1994 VL 103 IS 3 BP 186 EP 192 DI 10.1007/BF00368011 PG 7 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA NU295 UT WOS:A1994NU29500005 PM 7924621 ER PT J AU MOON, HS SONG, YG LEE, SY AF MOON, HS SONG, YG LEE, SY TI SUPERGENE VERMICULITIZATION OF PHLOGOPITE AND BIOTITE IN ULTRAMAFIC AND MAFIC ROCKS, CENTRAL KOREA SO CLAYS AND CLAY MINERALS LA English DT Article DE BIOTITE; INTERSTRATIFICATION; PHLOGOPITE; VERMICULITIZATION; WEATHERING ID SOILS AB An X-ray diffraction study of vermiculitized micas in ultramafic and mafic intrusive rocks from Cheongyang, Korea, shows the following weathering sequence: mica --> ordered mica/vermiculite interstratification --> vermiculite. Electron microprobe analyses show the general trends of K leaching and Ca enrichment with increased weathering. The vermiculitization of phlogopite from ultramafic rocks proceeds by means of a continuous decrease in Al-for-Si tetrahedral substitutions and a progressive increase in Al-for-(Fe2+ + Mg) octahedral substitutions in the early stage of weathering. These substitutions occur to compensate for the excess of negative charge in the mica-like layer, in agreement with currently accepted vermiculitization mechanisms. They change to a slight increase of Al-for-Si tetrahedral substitutions in the late stage of the vermiculitization of phlogopite, owing to the oxidation of Fe despite its low content. However, the behavior of Fe in the late stage of the transformation of biotite into vermiculite is significantly different; that is, Fe increases substantially. The reason for this Fe increase in the late stage remains unresolved. Recalculations of the structural formulas on the basis of several assumptions indicate that the oxidation of Fe is necessary for the vermiculite derived from biotite to form the reasonable structural formulas. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP MOON, HS (reprint author), YONSEI UNIV,DEPT GEOL,134 SHINCHON DONG,SOEDAEMUN KU,SEOUL 120749,SOUTH KOREA. NR 19 TC 9 Z9 9 U1 0 U2 2 PU CLAY MINERALS SOCIETY PI BOULDER PA PO BOX 4416, BOULDER, CO 80306 SN 0009-8604 J9 CLAY CLAY MINER JI Clay Clay Min. PD JUN PY 1994 VL 42 IS 3 BP 259 EP 268 DI 10.1346/CCMN.1994.0420304 PG 10 WC Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy; Soil Science SC Chemistry; Geology; Mineralogy; Agriculture GA PB153 UT WOS:A1994PB15300004 ER PT J AU YOSHIDA, SH VEIT, BC MANSFIELD, LE GERSHWIN, ME AF YOSHIDA, SH VEIT, BC MANSFIELD, LE GERSHWIN, ME TI THE USE OF THE CLINICAL IMMUNOLOGY LABORATORY SO CLINICAL REVIEWS IN ALLERGY LA English DT Review ID HUMAN-IMMUNODEFICIENCY-VIRUS; HUMAN MONOCLONAL-ANTIBODIES; FLOW CYTOMETRIC MEASUREMENT; CYTOPLASMIC FREE CALCIUM; T-CELL ACTIVATION; ENVELOPE GLYCOPROTEIN; HUMAN-LYMPHOCYTES; 3-COLOR IMMUNOFLUORESCENCE; TYPE-1 NEUTRALIZATION; RECOMBINANT GP160 C1 LAWRENCE LIVERMORE NATL LAB,DIV RHEUMATOL ALLERGY & CLIN IMMUNOL,DAVIS,CA 95616. WILLIAM BEAUMONT ARMY MED CTR,DEPT CLIN INVEST,EL PASO,TX 79920. TEXAS TECH UNIV,EL PASO,TX. UNIV TEXAS,EL PASO,TX 79968. NR 100 TC 1 Z9 1 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0731-8235 J9 CLIN REV ALLERG JI Clin. Rev. Allergy PD SUM PY 1994 VL 12 IS 2 BP 125 EP 149 PG 25 WC Allergy SC Allergy GA PD128 UT WOS:A1994PD12800002 PM 7954186 ER PT J AU BARLOW, RS CARTER, CD AF BARLOW, RS CARTER, CD TI RAMAN RAYLEIGH LIF MEASUREMENTS OF NITRIC-OXIDE FORMATION IN TURBULENT HYDROGEN JET FLAMES SO COMBUSTION AND FLAME LA English DT Article ID PROBABILITY DENSITY-FUNCTIONS; NONPREMIXED FLAMES; FLUORESCENCE MEASUREMENTS; NITROGEN EMISSIONS; DIFFUSION FLAMES; METHANE; COMBUSTION; SUPEREQUILIBRIUM; EXTINCTION; NO AB Simultaneous, time-resolved measurements of NO, major species, mixture fraction, temperature, and OH are obtained in nonpremixed turbulent hydrogen jet flames, using the combination of spontaneous Raman scattering, Rayleigh scattering, and laser-induced fluorescence. Results are presented for an undiluted hydrogen flame at Reynolds number 10,000 and for flames with 20 percent and 40 percent helium dilution. Scatter plots and conditional averages of NO mole fraction show gradual increases with streamwise distance. The width in mixture fraction coordinates of the zone of high NO mole fractions decreases with increasing streamwise distance. At a given mixture fraction, the fluctuation in NO mole fraction relative to the mean is greatest near the nozzle and decreases toward the flame tip. These effects are related to the streamwise evolution of turbulent flame structure from thin reaction layers near the nozzle to broad, near-equilibrium zones at the flame tip. Dilution with helium significantly reduces the measured NO levels and causes a slight shift of the curves of conditional average NO mole fraction toward the fuel-lean side of the stoichiometric mixture fraction. Favre averages and ensemble averages show significant bias, relative to conditional averages, in the relationship between NO mole fraction and mixture fraction. This suggests that the ''rich shift'' observed in some sampling-probe studies may result from the averaging process itself. RP BARLOW, RS (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 38 TC 101 Z9 103 U1 0 U2 16 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD JUN PY 1994 VL 97 IS 3-4 BP 261 EP 280 DI 10.1016/0010-2180(94)90020-5 PG 20 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA NP177 UT WOS:A1994NP17700002 ER PT J AU RAMSHAW, JD MESINA, GL AF RAMSHAW, JD MESINA, GL TI SIMPLIFIED HEURISTIC FOURIER-ANALYSIS OF ITERATION CONVERGENCE-RATES SO COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING LA English DT Article AB Chan and Elman (1989) have recently shown that heuristic Fourier analysis can be used to determine approximate convergence rates of iterative methods. Here we present a simple procedure and useful relations that facilitate the practical application of this method. The procedure is based on the fact that the mesh spacing h is typically small, so that attention may be restricted to the asymptotic behaviour of the convergence rate R for small h. We accordingly derive simple expressions for the first few coefficients in a Taylor series expansion of R in powers of h. These coefficients are expressed in terms of derivatives with respect to h of the complex Fourier growth factor xi rather than its modulus Absolute value of xi. The required derivatives can then be obtained by implicit differentiation without explicitly solving for xi, which further simplifies the analysis. The overall procedure is illustrated by applying it to the Jacobi, Gauss-Seidel and successive overrelaxation methods, for which we obtain results asymptotically equivalent to those of Chan and Elman. We also analyse the effect of second-order Richardson acceleration on the Jacobi method, for which we obtain an asymptotic convergence rate in precise agreement with classical analysis. RP RAMSHAW, JD (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1069-8299 J9 COMMUN NUMER METH EN JI Commun. Numer. Methods Eng. PD JUN PY 1994 VL 10 IS 6 BP 481 EP 487 DI 10.1002/cnm.1640100607 PG 7 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA NW752 UT WOS:A1994NW75200006 ER PT J AU ZICKER, SC VIVRETTE, S ROGERS, QR AF ZICKER, SC VIVRETTE, S ROGERS, QR TI CONCENTRATIONS OF AMINO-ACIDS IN PLASMA FROM 45-WEEK TO 47-WEEK GESTATION MARES AND FETUSES (EQUUS-CABALLUS) SO COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY LA English DT Article DE GESTATION; FETUSES; EQUUS CABALLUS ID TRANSPORT-SYSTEMS; GUINEA-PIG; FETAL; PLACENTA; PROTEIN; EQUINE; FETUS; EWE AB Concentrations of 16 of 24 amino acids in plasma of foetuses were significantly higher, while four of 24 were lower, than their concentration in maternal plasma. The higher foetal concentrations of amino acids in plasma are similar to other species, with some exceptions, and suggest that equine placenta actively transports and concentrates amino acids into the umbilical circulation. Concentrations of nine of 24 amino acids were significantly lower in plasma from the umbilical artery compared to plasma from the umbilical vein, while no significant differences were present between maternal artery and vein plasma. The umbilical venous-arterial difference in concentrations of amino acids in plasma suggests the foetus extracts amino acids from the umbilical circulation for catabolism or protein synthesis, as in other species. C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT PHYSIOL SCI,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT REPROD,DAVIS,CA 95616. NR 29 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 0305-0491 J9 COMP BIOCHEM PHYS B JI Comp. Biochem. Physiol. B-Biochem. Mol. Biol. PD JUN PY 1994 VL 108 IS 2 BP 173 EP 179 DI 10.1016/0305-0491(94)90063-9 PG 7 WC Biochemistry & Molecular Biology; Zoology SC Biochemistry & Molecular Biology; Zoology GA NT700 UT WOS:A1994NT70000003 PM 8055184 ER PT J AU SODERLUND, C BURKS, C AF SODERLUND, C BURKS, C TI GRAM AND GENFRAGII - SOLVING AND TESTING THE SINGLE-DIGEST, PARTIALLY ORDERED RESTRICTION MAP PROBLEM SO COMPUTER APPLICATIONS IN THE BIOSCIENCES LA English DT Article ID PHYSICAL MAP; STOCHASTIC RELAXATION; HUMAN-CHROMOSOMES; MAPPING DNA; ALGORITHMS; STRATEGY; GENOME AB GRAM (Genomic Restriction map AsseMbly) takes as input single-digest restriction fragments for a set of overlapping clones and outputs one or more plausible partially ordered restriction maps. For each restriction map, GRAM shows the corresponding alignment of the input clone fragments. Due to the error and uncertainty in experimental data, this problem is computationally difficult to solve; therefore, the principle objective in the design of GRAM is to facilitate man-machine collaborative problem solving. GRAM quickly approximates a solution, as follows. (i) A clustering algorithm determines a probable set of restriction fragments. (ii) An assembly algorithm permutes the set of restriction fragments such that the maximal number of clone fragments are contiguous. The output of the GRAM algorithm is displayed for the user to query and edit. This paper describes the stochastic assembly algorithm and shows how it works with the inter active graphics to support man-machine problem solving. In order to test and verify the performance of GRAM, we have developed a program called genfragII to simulate the digestion of clones and fragments, this program is described and results are presented. GRAM is also being used for a number of genome mapping projects. C1 LOS ALAMOS NATL LAB, THEORET BIOL & BIOPHYS GRP, LOS ALAMOS, NM 87545 USA. NR 22 TC 16 Z9 16 U1 0 U2 0 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0266-7061 J9 COMPUT APPL BIOSCI JI Comput. Appl. Biosci. PD JUN PY 1994 VL 10 IS 3 BP 349 EP 358 PG 10 WC Computer Science, Interdisciplinary Applications SC Computer Science GA NW129 UT WOS:A1994NW12900020 PM 7922694 ER PT J AU GAVRILOV, EM DUBOIS, DF ROSE, HA RUBENCHIK, AM AF GAVRILOV, EM DUBOIS, DF ROSE, HA RUBENCHIK, AM TI NUMERICAL-SIMULATION OF A MODEL OF RESONANCE-ABSORPTION FOR SUBPICOSECOND LASER-PULSES SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID INTENSITY AB A capacitor model which is used to simulate the interaction of a powerful, subpicosecond laser pulse with a plasma is simulated by means of 1D electrostatic particle code. We take into account the temporal profile of the laser pulse, and the growth of the electron energy by several orders of magnitude while providing adequate temporal and spatial resolution. It is shown that during the pulse the excited plasma structure evolves from a coherent to a turbulent state. The factors, which can affect this process are discussed. C1 RUSSIAN ACAD SCI,INST AUTOMAT & ELECTROMETRY,SIBERIAN BRANCH,NOVOSIBIRSK,RUSSIA. UNIV CALIF DAVIS,PLASMA PHYS RES INST,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP GAVRILOV, EM (reprint author), LOS ALAMOS NATL LAB,MS B287,LOS ALAMOS,NM 87545, USA. NR 9 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD JUN PY 1994 VL 81 IS 1-2 BP 65 EP 73 DI 10.1016/0010-4655(94)90111-2 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NV035 UT WOS:A1994NV03500004 ER PT J AU STOTLER, DP REIERSEN, WT BATEMAN, G AF STOTLER, DP REIERSEN, WT BATEMAN, G TI ASPECT - AN ADVANCED SPECIFIED-PROFILE EVALUATION CODE FOR TOKAMAKS SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID COMPACT IGNITION TOKAMAK; GLOBAL ENERGY CONFINEMENT; TRANSPORT CODE; PLASMA; PERFORMANCE; SIMULATIONS; REACTOR; LIMITS AB A specified-profile, global analysis code has been developed to evaluate the performance of fusion reactor designs. Both steady-state and time-dependent calculations are carried out; the results of the former can be used in defining the parameters of the latter, if desired. In the steady-state analysis, the performance is computed at a density and temperature chosen to be consistent with input limits (e.g. density and beta) of several varieties. The calculation can be made at either the intersection of the two limits or at the point of optimum performance as the density and temperature are varied along the limiting boundaries. Two measures of performance are available for this purpose: the ignition margin or the confinement level required to achieve a prescribed ignition margin. The time-dependent calculation can be configured to yield either the evolution of plasma energy as a function of time or, via an iteration scheme, the amount of auxiliary power required to achieve a desired final plasma energy. RP STOTLER, DP (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Stotler, Daren/J-9494-2015 OI Stotler, Daren/0000-0001-5521-8718 NR 42 TC 2 Z9 2 U1 0 U2 0 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 JUN PY 1994 VL 81 IS 1-2 BP 261 EP 291 DI 10.1016/0010-4655(94)90124-4 PG 31 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NV035 UT WOS:A1994NV03500017 ER PT J AU GARGARO, A RADA, R MOORE, J CARSON, GS DEBLASI, J EMERY, D HAYNES, C KLENSIN, J MONTANEZ, I SPAFFORD, E AF GARGARO, A RADA, R MOORE, J CARSON, GS DEBLASI, J EMERY, D HAYNES, C KLENSIN, J MONTANEZ, I SPAFFORD, E TI ACM TECHNICAL STANDARDS COMMITTEE - A NEW ADVOCACY POWER SO COMPUTER STANDARDS & INTERFACES LA English DT Article DE ACM TECHNICAL STANDARDS COMMITTEE; SPECIAL INTEREST GROUPS; DISSEMINATION; OPENNESS AB The ACM Technical Standards Committee (TSC) was created in 1992 to support the opportunities for ACM members to influence the Progress of standards. The TSC coordinates closely with the Special Interest Groups of the ACM and uses electronic mail to communicate on matters of mutual interest. The TSC is particularly interested in supporting good standards and providing constructive feedback for proposed standards. For instance, the TSC expects to comment when a proposed standard does not adequately meet the standards development process requirements for openness and adequate technical review. C1 COMP SCI CORP,MT LAUREL,NJ 08054. UNIV LIVERPOOL,DEPT COMP SCI,LIVERPOOL L69 3BX,ENGLAND. IBM CORP,FED SYST CO,GAITHERSBURG,MD 20879. GSC ASSOCIATES INC,HAWTHORNE,CA 90250. ACM,NEW YORK,NY 10036. MITRE CORP,BEDFORD,MA 01730. INDIANA UNIV,DEPT COMP SCI,BLOOMINGTON,IN 47405. BROOKHAVEN NATL LAB,UPTON,NY 11973. PURDUE UNIV,DEPT COMP SCI,W LAFAYETTE,IN 47907. RI Spafford, Eugene/Q-1244-2015 OI Spafford, Eugene/0000-0002-5555-8330 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5489 J9 COMP STAND INTER JI Comput. Stand. Interfaces PD JUN PY 1994 VL 16 IS 2 BP 139 EP 142 PG 4 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA NU665 UT WOS:A1994NU66500005 ER PT J AU HERKOMMER, MA WHITNEY, PD AF HERKOMMER, MA WHITNEY, PD TI MINIMIZING MISTIES IN SEISMIC DATA SO COMPUTERS & GEOSCIENCES LA English DT Article DE SEISMIC DATA PROCESSING; INTERSECTION ANALYSIS; MISTIE ANALYSIS; GRAPH THEORY; LEAST-SQUARES ERROR MINIMIZATION ID ADJUSTMENT AB The intersections of seismic lines and respective ''corrections'' for associated measures are an integral part of geophysical measures. The procedure to minimize errors can be accomplished through a global smoothing technique. Data are read from an input file with the ranges computed. For each seismic line intersection the mistied Z-value is computed. From this set of misties the correction vector is computed for each line in the data set. The computed correction vector is added back into the values on the lines to create a bulk shift (Z axis correction). The resulting shifted data have their errors minimized in a least-squares sense. The technique is applied easily to other types of data gathered along survey lines. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP HERKOMMER, MA (reprint author), PETROSPEC COMP CORP, 1222 E ARAPAHO RD 302, RICHARDSON, TX 75081 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0098-3004 J9 COMPUT GEOSCI JI Comput. Geosci. PD JUN PY 1994 VL 20 IS 5 BP 767 EP 795 DI 10.1016/0098-3004(94)90113-9 PG 29 WC Computer Science, Interdisciplinary Applications; Geosciences, Multidisciplinary SC Computer Science; Geology GA NU279 UT WOS:A1994NU27900006 ER PT J AU MCGRATH, G AF MCGRATH, G TI OPTIMIZING MC68882 CODE SO DR DOBBS JOURNAL LA English DT Article C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,B FACTORY,STANFORD,CA 94305. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLER FREEMAN, INC PI SAN MATEO PA 411 BOREL AVE, SAN MATEO, CA 94402-3522 SN 1044-789X J9 DR DOBBS J JI Dr. Dobbs J. PD JUN PY 1994 VL 19 IS 6 BP 58 EP & PG 0 WC Computer Science, Software Engineering SC Computer Science GA NH413 UT WOS:A1994NH41300014 ER PT J AU LOEHLE, C WEIN, G AF LOEHLE, C WEIN, G TI LANDSCAPE HABITAT DIVERSITY - A MULTISCALE INFORMATION-THEORY APPROACH SO ECOLOGICAL MODELLING LA English DT Article DE DIVERSITY; FRACTALS; LANDSCAPE; ORDINATION ID FRACTAL GEOMETRY; SELF-SIMILARITY; PATTERNS AB Biotic diversity is a topic of increasing concern, but current tools for quantifying diversity at the landscape level are inadequate. A new index is proposed. Beginning with a classified raster image of a landscape, each habitat type is assigned a value based on an ordination axis distance. The change in value from one location to the next depends on how similar the two locations are. An information measure d(I) is used to evaluate deviation from uniformity of the ordination values at different spatial scales. Different maps can be compared if habitat values are based on the same ordination scale. This new method provides a powerful tool for both displaying and calculating landscape habitat diversity. C1 MEMPHIS STATE UNIV,DEPT BIOL,MEMPHIS,TN 38152. RP LOEHLE, C (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 27 TC 38 Z9 50 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD JUN PY 1994 VL 73 IS 3-4 BP 311 EP 329 DI 10.1016/0304-3800(94)90068-X PG 19 WC Ecology SC Environmental Sciences & Ecology GA NR602 UT WOS:A1994NR60200008 ER PT J AU MEYERS, S SCHIPPER, L SALAY, J AF MEYERS, S SCHIPPER, L SALAY, J TI ENERGY USE IN POLAND - AN INTERNATIONAL COMPARISON SO ENERGY LA English DT Article AB The structure of energy use in Poland and other former centrally-planned economies historically differed considerably from that in Western countries. With the transition toward market-oriented economies underway, changes have occurred, but most of the physical stock remains in place. We compare energy use in Poland with that in Western countries in industry, transportation, and the residential and service sectors. We present data for 1988, the last full year of the centrally-planned economy, and for 1991, after reforms had begun to have an impact. We describe how differences between Poland and Western countries in sectoral energy use are shaped by variation in levels of energy-using activity, the structure of activity, and specific energy intensities. The comparison shows that Poland's comparatively high energy intensities in manufacturing and residential space heating, along with the energy-intensive structure of manufacturing, explain why energy use per capita in Poland is not much below W. European levels despite Poland's much lower GDP per capita. RP MEYERS, S (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 18 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD JUN PY 1994 VL 19 IS 6 BP 601 EP 617 DI 10.1016/0360-5442(94)90001-9 PG 17 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA NQ371 UT WOS:A1994NQ37100001 ER PT J AU SPALDING, BP AF SPALDING, BP TI VOLATILIZATION OF CESIUM-137 FROM SOIL WITH CHLORIDE AMENDMENTS DURING HEATING AND VITRIFICATION SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article AB During vitrification of soil and soil:limestone mixtures, significant volatilization (>10%) of the radioisotope Cs-137 occurred particularly in the presence of small amounts (<5%) of chloride-containing species including sodium chloride, calcium chloride, hydrochloric acid, and poly(vinyl chloride). Sodium chloride was found to be the most effective, resulting in volatilization of >99% of the Cs-137 by repeated amendment and treatment at 1000-degrees-C. Amendment with sodium borate and subsequent heating to 1200-degrees-C also stimulated significant volatilization of Cs-137. However, amendments up to 10% of other chemicals including carbonates, nitrates, phosphates, sulfates, fluorides, polystyrene, graphite, stainless steels, iron, zinc oxide, and antimony oxide did not increase Cs-137 volatilization compared to unamended samples. The majority of the chloride-induced volatilization occurred between 800 and 1000-degrees-C for sodium chloride-amended samples of both soil and soil:limestone mixtures. Thus, an effective and potentially efficient soil decontamination technique for Cs-137 has been identified. RP SPALDING, BP (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 17 TC 10 Z9 10 U1 3 U2 9 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 JUN PY 1994 VL 28 IS 6 BP 1116 EP 1123 DI 10.1021/es00055a022 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA NP277 UT WOS:A1994NP27700026 PM 22176238 ER PT J AU LEE, JH TANG, IN WEINSTEINLLOYD, JB AF LEE, JH TANG, IN WEINSTEINLLOYD, JB TI IMPROVED NONENZYMATIC METHOD FOR THE DETERMINATION OF GAS-PHASE PEROXIDES SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID AUTOMATED FLUOROMETRIC METHOD; HYDROGEN-PEROXIDE; ORGANIC PEROXIDES; SULFUR-DIOXIDE; LOW PH; H2O2; AIR; HYDROPEROXIDES; TROPOSPHERE; KINETICS AB We report an improved method for sampling and real-time determination of gaseous hydrogen peroxide, hydroxymethyl hydroperoxide (HMHP), and methyl hydroperoxide (MHP) in the atmosphere. The analytical method is based on the hydroxylation of benzoic acid by Fenton reagent [Fe(II) and H2O2] to form the fluorescent product, hydroxybenzoic acid. Fluorescence intensity is enhanced by complexation with aluminum ion. A novel sampling device with a surfaceless intake permitting collection of gas-phase peroxides without inlet line losses is described. SO2 interference in the measurements has been fully characterized, and experimental conditions have been specified for minimizing such interference. Significant concentrations of organic peroxides were observed when the improved method was fielded during the Southern Oxidant Study/Southern Oxidant Research Program on Ozone Nonattainment (SOS/SORP-ONA) in Atlanta, GA, in August 1992 and during the North Atlantic Regional Experiment (NARE) in Nova Scotia in August 1993. C1 SUNY COLL OLD WESTBURY,DEPT CHEM PHYS,OLD WESTBURY,NY 11568. RP LEE, JH (reprint author), BROOKHAVEN NATL LAB,DIV ENVIRONM CHEM,UPTON,NY 11973, USA. NR 43 TC 34 Z9 35 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 JUN PY 1994 VL 28 IS 6 BP 1180 EP 1185 DI 10.1021/es00055a032 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA NP277 UT WOS:A1994NP27700036 PM 22176248 ER PT J AU KAPLAN, DI HUNTER, DB BERTSCH, PM BAJT, S ADRIANO, DC AF KAPLAN, DI HUNTER, DB BERTSCH, PM BAJT, S ADRIANO, DC TI APPLICATION OF SYNCHROTRON X-RAY-FLUORESCENCE SPECTROSCOPY AND ENERGY-DISPERSIVE X-RAY-ANALYSIS TO IDENTIFY CONTAMINANT METALS ON GROUNDWATER COLLOIDS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Note C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DIV BIOGEOCHEM,DRAWER E,AIKEN,SC 29802. RI Bajt, Sasa/G-2228-2010 NR 12 TC 34 Z9 34 U1 1 U2 5 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 JUN PY 1994 VL 28 IS 6 BP 1186 EP 1189 DI 10.1021/es00055a033 PG 4 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA NP277 UT WOS:A1994NP27700037 PM 22176249 ER PT J AU PAPAMOSCHOU, D ROBEY, HF AF PAPAMOSCHOU, D ROBEY, HF TI OPTICAL TECHNIQUE FOR DIRECT MEASUREMENT OF POWER SPECTRA IN COMPRESSIBLE TURBULENCE SO EXPERIMENTS IN FLUIDS LA English DT Article AB We present exploratory tests of a new optical method which measures directly two components of the 3-D power spectrum of the refractive-index fluctuation. The method was applied to a Mach 2 turbulent shear layer. Length scales of 0.1 mm to 1.0 mm were resolved within a shear-layer thickness ranging from 5 mm to 10 mm. At low-to-moderate wavenumbers, the spectral behavior is roughly kappa-3, while at higher wavenumbers it is kappa-3.7. These spectral slopes are in agreement with prevailing theoretical predictions for anisotropic (low-wavenumber) and isotropic (high-wavenumber) turbulence. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PAPAMOSCHOU, D (reprint author), UNIV CALIF IRVINE,DEPT AEROSP & MECH ENGN,IRVINE,CA 92717, USA. NR 9 TC 1 Z9 1 U1 1 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD JUN PY 1994 VL 17 IS 1-2 BP 10 EP 15 DI 10.1007/BF02412798 PG 6 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA NW365 UT WOS:A1994NW36500002 ER PT J AU BOGEN, KT AF BOGEN, KT TI CANCER POTENCIES OF HETEROCYCLIC AMINES FOUND IN COOKED FOODS SO FOOD AND CHEMICAL TOXICOLOGY LA English DT Article ID ANIMAL CARCINOGENICITY DATA; FRIED GROUND-BEEF; MUTAGENIC COMPOUND; FEEDING 2-AMINO-3,4-DIMETHYLIMIDAZO<4,5-F>QUINOLINE; RODENT CARCINOGENS; MULTISTAGE MODEL; BROILED SARDINE; TUMOR DATA; F344 RATS; MICE AB Quantitative estimates of potential cancer risk associated with eating heterocyclic amines (HAs) in cooked foods and food products, known to be highly mutagenic in the Ames/Salmonella assay and to cause cancer in laboratory animals, rely on estimates of carcinogenic potency from animal bioassay data. New estimates of potential human cancer potency are presented for 10 HAs associated with potential human dietary exposure from cooked-food sources. These estimates differ from previous similar estimates in that they properly reflect the fact that most of these HAs exhibit a pronounced ability to induce tumours at multiple histologically distinct sites within each sex/species tested, and so might be expected to be multipotent carcinogens in humans as well. Thus, in addition to 82 tumour-type-specific potencies estimated for these compounds, 24 additional estimates of aggregate potency (to induce one or more tumour types) were made, using different methods to scale estimated bioassay cancer potency to humans. The currently unknown potency of an additional cooked-food HA was estimated using linear regressions of log-carcinogenic on log-mutagenic potency for the other 10 HAs, some of which were highly significant (e.g. r = 0.85, P < 0.004). The potency estimates obtained are consistent with an upper-bound cancer risk between 10(-3) and 10(-4) for an average lifetime cooked-beef intake of 3.3 g/kg/day (or approx. 0.5 lb/day). Use of these potency estimates to obtain more realistic upper-bound estimates of dietary-HA risk will require detailed HA-exposure assessments. RP BOGEN, KT (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HLTH & ECOL ASSESSMENT L-453,7000 EAST AVE,LIVERMORE,CA 94550, USA. FU NCI NIH HHS [P01 CA55861-01] NR 67 TC 34 Z9 34 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-6915 J9 FOOD CHEM TOXICOL JI Food Chem. Toxicol. PD JUN PY 1994 VL 32 IS 6 BP 505 EP 515 DI 10.1016/0278-6915(94)90106-6 PG 11 WC Food Science & Technology; Toxicology SC Food Science & Technology; Toxicology GA NZ008 UT WOS:A1994NZ00800003 PM 8045455 ER PT J AU YEH, LH KIM, YS AF YEH, LH KIM, YS TI CORRESPONDENCE BETWEEN THE CLASSICAL AND QUANTUM CANONICAL TRANSFORMATION GROUPS FROM AN OPERATOR FORMULATION OF THE WIGNER FUNCTION SO FOUNDATIONS OF PHYSICS LA English DT Article ID PHASE-SPACE METHODS; NONCOMMUTING OPERATORS; SQUEEZED STATES; PARITY OPERATOR; MECHANICS; CALCULUS; COHERENT AB An explicit expression of the ''Wigner operator'' is derived, such that the Wigner function of a quantum stale is equal to the expectation value of this operator with respect to the same stare. This Wigner operator leads to a representation-independent procedure for establishing the correspondence between the inhomogeneous symplectic group applicable to linear canonical transformations in classical mechanics and the Weyl-metaplectic group governing the symmetry of unitary transformations in quantum mechanics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. RP YEH, LH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 34 TC 4 Z9 4 U1 1 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0015-9018 J9 FOUND PHYS JI Found. Phys. PD JUN PY 1994 VL 24 IS 6 BP 873 EP 884 DI 10.1007/BF02067652 PG 12 WC Physics, Multidisciplinary SC Physics GA PE979 UT WOS:A1994PE97900003 ER PT J AU Hwang, RQ Behm, RJ AF Hwang, R. Q. Behm, R. J. TI PATTERN FORMATION IN METAL ON METAL EPITAXY SO FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY LA English DT Article AB With the application scanning tunneling microscopy to the field of metal on metal epitaxy, the precise forms of the two dimensional islands initially created can be studied in great detail. A variety of shapes have been discovered. By carefully studying the effect of growth parameters and quantitatively analyzing the resultant shapes, the details of the atomistic processes governing the pattern formation can be extracted. In the paper we review several examples of this type of study. C1 [Hwang, R. Q.; Behm, R. J.] Univ Munich, Inst Kristallog & Mineral, D-8000 Munich 2, Germany. RP Hwang, RQ (reprint author), Sandia Natl Labs, Dept 8347, Livermore, CA 94550 USA. FU Deutsche Forschungsgemeinschaft [338]; Alexander von Humboldt Foundation FX This work was supported by the Deutsche Forschungsgemeinschaft via SFB No. 338. R. Q. H. also gratefully acknowledges the support of the Alexander von Humboldt Foundation. NR 27 TC 3 Z9 3 U1 0 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-348X J9 FRACTALS JI Fractals-Complex Geom. Patterns Scaling Nat. Soc. PD JUN PY 1994 VL 2 IS 2 BP 183 EP 189 DI 10.1142/S0218348X9400017X PG 7 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V18WY UT WOS:000208036100002 ER PT J AU STEVENS, R AF STEVENS, R TI HIGH-PERFORMANCE COMPUTING AND COMMUNICATIONS SO FUTURE GENERATION COMPUTER SYSTEMS LA English DT Article; Proceedings Paper CT 1993 High Performance Computing and Networking Conference (HPCN 93) CY MAY, 1993 CL AMSTERDAM, NETHERLANDS DE HIGH-PERFORMANCE COMPUTING AND COMMUNICATIONS (HPCC) PROGRAM; COMPUTATIONAL SCIENCE; SCALABLE I/O; SP1 COMPUTER; NATIONAL INFORMATION INFRASTRUCTURE (NII) AB This paper has two parts. The first part discusses the US High-Performance Computing and Communications program - its goals, funding, progress, revisions, and research in high-performance computing systems, advanced software technology and applications, national research and education networking, information infrastructure technology, and basic research and human resources. The second part of the presentation covers specific work conducted under this program at Argonne National Laboratory, Argonne's efforts focus on computational science research, software tool development, and evaluation of experimental computer architectures. In addition, we describe collaborative activities at Argonne in high-performance computing, including an Argonne/IBM project to evaluate and test IBM's newest parallel computers and the Scalable I/O Initiative being spearheaded by the Concurrent Supercomputing Consortium. RP STEVENS, R (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-739X J9 FUTURE GENER COMP SY JI Futur. Gener. Comp. Syst. PD JUN PY 1994 VL 10 IS 2-3 BP 159 EP 167 DI 10.1016/0167-739X(94)90014-0 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA QD753 UT WOS:A1994QD75300003 ER PT J AU WILLE, LT ROGERS, JL BURMESTER, CP GRONSKY, R AF WILLE, LT ROGERS, JL BURMESTER, CP GRONSKY, R TI TOWARDS FIRST-PRINCIPLES THEORIES OF MATERIALS AND BIOLOGICAL-SYSTEMS - THE NEED FOR MASSIVE PARALLELISM SO FUTURE GENERATION COMPUTER SYSTEMS LA English DT Article; Proceedings Paper CT 1993 High Performance Computing and Networking Conference (HPCN 93) CY MAY, 1993 CL AMSTERDAM, NETHERLANDS DE MASSIVELY PARALLEL COMPUTING; SIMD COMPUTERS; MATERIALS SCIENCE; BIOPHYSICS; PARALLEL MONTE CARLO SIMULATION; CHAOS ID YBA2CU3OZ; DYNAMICS AB The first-principles paradigm, i.e. the calculation of a physical, chemical, or biological system's properties without including any fitted or adjustable parameters, is one of the most powerful in the scientist's quest to understand nature. Unfortunately most first-principles computations involve quite complicated governing equations and large system sizes, both of which have a detrimental effect on memory size and computer time requirements. Using two relatively simple yet realistic models, one in materials science and one in biophysics, it is discussed here how massive parallelism can make such studies feasible. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP WILLE, LT (reprint author), FLORIDA ATLANTIC UNIV,DEPT PHYS,BOCA RATON,FL 33431, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-739X J9 FUTURE GENER COMP SY JI Futur. Gener. Comp. Syst. PD JUN PY 1994 VL 10 IS 2-3 BP 331 EP 338 DI 10.1016/0167-739X(94)90039-6 PG 8 WC Computer Science, Theory & Methods SC Computer Science GA QD753 UT WOS:A1994QD75300028 ER PT J AU DAMLE, AS GANGWAL, SK VENKATARAMAN, VK AF DAMLE, AS GANGWAL, SK VENKATARAMAN, VK TI A SIMPLE-MODEL FOR A WATER-GAS SHIFT MEMBRANE REACTOR SO GAS SEPARATION & PURIFICATION LA English DT Article DE SHIFT REACTION; MEMBRANE REACTOR; MODELING; KNUDSEN DIFFUSION; HYDROGEN ID DEHYDROGENATION AB A simplified process model was developed to simulate a catalytic membrane water gas shift (WGS) reactor. A number of computer simulations were conducted to determine the potential of increased carbon monoxide (CO) conversion in WGS reaction due to simultaneous separation of product hydrogen (H-2) from the reactant mixture. Gas separation factors based on Knudsen diffusion were used in these simulations to assess the feasibility of inorganic and ceramic membranes in a high-temperature, high-pressure (HTHP) coal gasification environment. The simulations indicated that although the increase in CO conversion and hydrogen concentration in a single membrane reactor stage was significant, a multistage membrane separation system would be needed to increase the hydrogen product concentration above 90%. As expected, increasing the feed pressure to permeate pressure ratio was found to increase the CO conversion and the product hydrogen concentration. At low feed to permeate pressure ratios, the model predicted a much better membrane reactor performance with a countercurrent feed and permeate flow scheme when compared with a concurrent flow scheme. The membrane performance, of course, depends strongly on the gas separation factors. With gas separation factors lower than the ideal Knudsen diffusion separation factors (e.g. H-2 to CO2 separation factor of 2 instead of the ideal Knudsen value of 4.7), the model simulation predicted a much smaller increase in CO conversion and product hydrogen concentration. C1 US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507. RP DAMLE, AS (reprint author), SRI INT,333 RAVENSWOOD AVE,MENLO PK,CA 94025, USA. NR 7 TC 18 Z9 18 U1 0 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0950-4214 J9 GAS SEP PURIF JI Gas Sep. Purif. PD JUN PY 1994 VL 8 IS 2 BP 101 EP 106 DI 10.1016/0950-4214(94)80016-2 PG 6 WC Engineering, Chemical SC Engineering GA NM550 UT WOS:A1994NM55000004 ER PT J AU LOWRY, SR WILSON, K BLAZEJ, R CHIU, J RINE, J OSTRANDER, EA AF LOWRY, SR WILSON, K BLAZEJ, R CHIU, J RINE, J OSTRANDER, EA TI IDENTIFICATION, CHARACTERIZATION, AND PHYSICAL MAPPING OF 14 POLYMORPHIC SIMPLE SEQUENCE REPEAT MARKERS ON HUMAN-CHROMOSOME-21 SO GENOMICS LA English DT Note ID YEAST ARTIFICIAL CHROMOSOMES; DINUCLEOTIDE REPEAT; CLONES; GENE AB Fourteen new dinucleotide repeat polymorphisms specific for human chromosome 21 have been identified, mapped, and characterized. The average heterozygosity of all markers was 0.66. The average PIC value was 0.61. The markers were mapped by STS content mapping of YACs previously assigned to chromosome 21. The correlation of polymorphic genetic markers with substantially complete physical maps should facilitate the identification of loci of interest on chromosome 21. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,CTR HUMAN GENOME,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELLULAR BIOL,BERKELEY,CA 94720. OI Ostrander, Elaine/0000-0001-6075-9738 NR 16 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUN PY 1994 VL 21 IS 3 BP 633 EP 637 DI 10.1006/geno.1994.1324 PG 5 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA NT135 UT WOS:A1994NT13500022 PM 7959742 ER PT J AU WEIER, HUG POLIKOFF, D FAWCETT, JJ GREULICH, KM LEE, KH CRAM, S CHAPMAN, VM GRAY, JW AF WEIER, HUG POLIKOFF, D FAWCETT, JJ GREULICH, KM LEE, KH CRAM, S CHAPMAN, VM GRAY, JW TI GENERATION OF 5 HIGH-COMPLEXITY PAINTING PROBE LIBRARIES FROM FLOW-SORTED MOUSE CHROMOSOMES SO GENOMICS LA English DT Note ID INSITU HYBRIDIZATION; DNA; REGION; PCR AB Mouse metaphase chromosomes were purified by how sorting from the murine fibroblast cell line Mus spretus clone 5A. We sorted chromosomes that fell into five individual peaks based on the Hoechst 33258/chromomycin A3 DNA histogram: three peaks corresponding to the least amount of DNA and two peaks representing chromosomes with the most DNA content. This is the first example of the successful application of bivariate how karyotyping to murine chromosome sorting. We then applied primer-directed in vitro DNA amplification using the polymerase chain reaction (PCR) to generate and label larger amounts of chromosome-specific DNA. In situ hybridization showed specific binding of the PCR products to mouse chromosomes Y, 19, 18, 3, and X as well as chromosomes 1 and 2. The combination of chromosome sorting from the M. spretus cell line and PCR proved to be highly valuable for generation of pools of DNA fragments that exhibit specific binding to mouse chromosomes and can be used to identify and delineate mouse metaphase chromosomes. (C) 1994 Acaaemic Press, Inc. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. NEW YORK STATE DEPT HLTH,ROSWELL PK CANC INST,DEPT MOLEC & CELLULAR BIOL,BUFFALO,NY 14263. RP WEIER, HUG (reprint author), UNIV CALIF SAN FRANCISCO,SCH MED,DIV MOLEC CYTOMETRY,MCB 230,SAN FRANCISCO,CA 94143, USA. FU NCRR NIH HHS [RR01315] NR 13 TC 42 Z9 43 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 0888-7543 J9 GENOMICS JI Genomics PD JUN PY 1994 VL 21 IS 3 BP 641 EP 644 DI 10.1006/geno.1994.1326 PG 4 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA NT135 UT WOS:A1994NT13500024 PM 7959744 ER PT J AU OAKES, CS BODNAR, RJ SIMONSON, JM PITZER, KS AF OAKES, CS BODNAR, RJ SIMONSON, JM PITZER, KS TI CRITICAL AND SUPERCRITICAL PROPERTIES FOR 0.3 TO 3.0 MOL-CENTER-DOT-KG(-1)CACL2(AQ) SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID SYNTHETIC FLUID INCLUSIONS; TEMPERATURES; VAPOR; DENSITIES; EQUILIBRIA; PRESSURES; NACL-H2O AB Critical temperatures (T(c)) and densities (rho(c)) for aqueous CaCl2 solutions were measured using two different optical techniques. Fluid inclusions with compositions of 0.5 to 4.0 mol . kg-1 were synthesized from 600 to 820-degrees-C and at 1500 and 2500 bars in both the single and two-fluid phase fields. Critical temperatures were determined from measured homogenization temperatures and the observed mode of homogenization (i.e., to the liquid or vapor phase or by fading of the meniscus between apparent equal volumes of liquid and vapor). Critical temperatures determined by this method for 0.5, 1.0, 2.0, and 3.0 molal CaCl2(aq) solutions are 395, 406, 466, and 565-degrees-C, respectively. T(c) for 4.0 molal CaCl2(aq) was found to be in excess of 662-degrees-C. Critical pressures (P(c)) could not be accurately determined from these measurements but were estimated from another source. Measurements of T(c) were also made using sealed silica capillaries containing 0.3, 0.5, 1.0, and 2.0 molal CaCl2(aq) solutions. T(c) values from these measurements are 388, 393, 405, and 465-degrees-C, respectively. Our data are in fair agreement with previously published data at and below 1.0 mol . kg-1. Above 1 mol . kg-1, data from the two published sources of CaCl2(aq) T(c) measurements show substantially different trends, with the data from this study agreeing with the more recent of the two reports. Estimated values of rho(c) are given for the solutions examined in the capillary tube experiments. These measurements are based on estimated tube volumes, measured liquid volumes, and solution densities at ambient temperature. Critical isochores are presented with new synthetic fluid inclusion derived isochores for 1.0 and 2.0 mol . kg-1 CaCl2(aq) liquids to form a complete arrays of isochores for temperatures from approximately 100-degrees-C to those along the critical isochore and pressures to 5000 bars. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT GEOL SCI,BLACKSBURG,VA 24061. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RI Bodnar, Robert/A-1916-2009 NR 18 TC 11 Z9 11 U1 0 U2 3 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 JUN PY 1994 VL 58 IS 11 BP 2421 EP 2431 DI 10.1016/0016-7037(94)90021-3 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NR562 UT WOS:A1994NR56200002 ER PT J AU BERESNEV, IA JOHNSON, PA AF BERESNEV, IA JOHNSON, PA TI ELASTIC-WAVE STIMULATION OF OIL PRODUCTION - A REVIEW OF METHODS AND RESULTS SO GEOPHYSICS LA English DT Review ID WATER-LEVEL; EARTHQUAKES; FLUCTUATIONS; WELLS AB Numerous observations accumulated principally during the last 40 years show that seismic waves generated from earthquakes and cultural noise may alter water and oil production. In some cases wave excitation may appreciably increase the mobility of fluids. The effect of elastic waves on the permeability of saturated rock has been confirmed in numerous laboratory experiments. Two related applications have arisen from these findings. In the first application, high-power ultrasonic waves are applied for downhole cleaning of the near-wellbore in producing formations that exhibit declining production as a result of the deposition of scales and precipitants, mud penetration, etc. In many cases, ultrasound effectively removes the barriers to oil flow into the well. The ultrasonic method is reported to be successful in 40-50 percent of the cases studied. In the case of successful treatment, the effect of improved permeability may last up to several months. Whereas this method has a very local effect, a second application is used to stimulate the reservoir as a whole. Here seismic frequency waves are applied at the earth's surface by arrays of vibroseis-type sources. This method has produced promising results; however, further testing and understanding of the mechanisms are necessary. C1 LOS ALAMOS NATL LAB,GEOENGN GRP,LOS ALAMOS,NM 87545. RP BERESNEV, IA (reprint author), ACAD SINICA,INST EARTH SCI,POB 1-55 NANKANG,TAIPEI 11529,TAIWAN. NR 105 TC 141 Z9 147 U1 5 U2 15 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD JUN PY 1994 VL 59 IS 6 BP 1000 EP 1017 DI 10.1190/1.1443645 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NQ413 UT WOS:A1994NQ41300014 ER PT J AU HRMA, P KIM, D AF HRMA, P KIM, D TI SULFATE MASS-BALANCE AND FOAMING THRESHOLD IN A SODA LIME GLASS SO GLASS TECHNOLOGY LA English DT Article ID SODIUM-SULFATE DECOMPOSITION; MELTS; BATCH; MODEL AB A semiempirical equation relating the foaming temperature to sulphate concentration was established. Literature data on sulphate solubility and melt viscosity and the variation of foaming temperature with sulphate concentration obtained in a previous study were used to evaluate empirical coefficients involved in the equation. An agreement between theory and experiment was attained when bubble nucleation on undissolved silica grains and nonuniform distribution of SiO2 within the melt were considered. The results show that the rate of dissolution of solid grains in the melt and the temperature history control sulphate foam formation and retention in glass. RP HRMA, P (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 15 TC 6 Z9 6 U1 1 U2 2 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA 9 CHURCHILL WAY, SHEFFIELD S35 2PY, CHAPELTOWN, ENGLAND SN 0017-1050 J9 GLASS TECHNOL JI Glass Technol. PD JUN PY 1994 VL 35 IS 3 BP 128 EP 134 PG 7 WC Materials Science, Ceramics SC Materials Science GA NW783 UT WOS:A1994NW78300006 ER PT J AU MILLS, WA AF MILLS, WA TI HEALTH-EFFECTS AND ELECTROMAGNETIC-FIELDS SO HEALTH PHYSICS LA English DT Letter RP MILLS, WA (reprint author), OAK RIDGE ASSOCIATED UNIV, 1019 19TH ST NW, SUITE 700, WASHINGTON, DC 20036 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUN PY 1994 VL 66 IS 6 BP 708 EP 708 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA NM106 UT WOS:A1994NM10600013 PM 8181944 ER PT J AU DISANZO, F WHITE, CM AF DISANZO, F WHITE, CM TI CHROMATOGRAPHIC METHODS IN THE ANALYSIS OF FOSSIL AND SYNTHETIC FUELS .2. SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Editorial Material C1 PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA. RP DISANZO, F (reprint author), MOBIL RES & DEV CORP,PAULSBORO,NJ 08066, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD JUN PY 1994 VL 17 IS 6 BP 369 EP 369 PG 1 WC Chemistry, Analytical SC Chemistry GA NY082 UT WOS:A1994NY08200001 ER PT J AU BRONZINO, JD GOVER, J AF BRONZINO, JD GOVER, J TI MEDICAL TECHNOLOGY - A SOLUTION TO THE HEALTH-CARE COST PROBLEM SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Editorial Material C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BRONZINO, JD (reprint author), TRINITY COLL,GRAD CTR PROGRAM BIOMED ENGN,HARTFORD,CT 06106, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD JUN-JUL PY 1994 VL 13 IS 3 BP 313 EP 315 DI 10.1109/51.293995 PG 3 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA NT446 UT WOS:A1994NT44600004 ER PT J AU GUSTAFSON, J AF GUSTAFSON, J TI TERAFLOPS AND OTHER FALSE GOALS SO IEEE PARALLEL & DISTRIBUTED TECHNOLOGY LA English DT Editorial Material RP GUSTAFSON, J (reprint author), AMES LAB,SCALABLE COMP LAB,236 WILHELM,AMES,IA 50011, USA. NR 0 TC 5 Z9 5 U1 0 U2 1 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 1063-6552 J9 IEEE PARALL DISTRIB JI IEEE Parallel Distrib. Technol. PD SUM PY 1994 VL 2 IS 2 BP 5 EP 6 DI 10.1109/88.311588 PG 2 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PT788 UT WOS:A1994PT78800002 ER PT J AU HANSEN, C CROCKETT, T WHITMAN, S AF HANSEN, C CROCKETT, T WHITMAN, S TI PARALLEL RENDERING SO IEEE PARALLEL & DISTRIBUTED TECHNOLOGY LA English DT Editorial Material C1 NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23061. DAVID SARNOFF RES CTR,PRINCETON,NJ 08543. RP HANSEN, C (reprint author), LOS ALAMOS NATL LAB,ADV COMP LAB,MS B-287,LOS ALAMOS,NM 87545, USA. NR 0 TC 6 Z9 8 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 1063-6552 J9 IEEE PARALL DISTRIB JI IEEE Parallel Distrib. Technol. PD SUM PY 1994 VL 2 IS 2 BP 7 EP 7 PG 1 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PT788 UT WOS:A1994PT78800003 ER PT J AU BURKE, GJ MILLER, EK BHATTACHARYYA, AK AF BURKE, GJ MILLER, EK BHATTACHARYYA, AK TI CURRENT ON A LONG, THIN WIRE IN A CHIRAL MEDIUM SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID RADIATION; SCATTERING; ANTENNA AB The propagation of current on a thin, straight wire in an infinite chiral medium is examined by solution of the integral equation for an infinite wire and also from the moment-method solution for a long wire of finite length. The current on the infinite wire is shown to consist of three components: a discrete mode that decays exponentially and two continuous-spectrum components from branch cuts from the two chiral wavenumbers. The integral equation for a finite wire i.n the chiral medium is solved by the method of moments using a modified version of the Numerical Electromagnetics Code (NEC). The moment-method solution is shown to be in close agreement with the modal solution for the infinite wire, providing validation for the numerical treatment. C1 NEW MEXICO STATE UNIV,PHYS SCI LAB,LAS CRUCES,NM 88003. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BURKE, GJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 27 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUN PY 1994 VL 42 IS 6 BP 827 EP 832 DI 10.1109/8.301702 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NY452 UT WOS:A1994NY45200008 ER PT J AU EPP, LW STANTON, PH JORGENSEN, RE MITTRA, R AF EPP, LW STANTON, PH JORGENSEN, RE MITTRA, R TI EXPERIMENTAL-VERIFICATION OF AN INTEGRAL-EQUATION SOLUTION FOR A THIN-WALLED DICHROIC PLATE WITH CROSS-SHAPED HOLES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note ID SCATTERING AB In order to add the capability of an X-band up link onto the NASA/JPL Deep space Network (DSN) 70-m antenna, a new dichroic plate is needed to replace the Pyle-guide shaped dichroic plate currently in use. The replacement dichroic plate must exhibit an additional pass band at the new up-link frequency of 7.165 GHz, while maintaining a pass band at the existing down-link frequency of 8.425 GHz. Because of the wide frequency separation of these two pass bands, conventionally designed air-filled dichroic plates exhibit grating lobe problems. A new method of solving this problem using a dichroic plate with cross-shaped holes is presented and verified experimentally. Two checks of the integral equation solution are described here. One is the comparison to a modal analysis for the limiting cross shape of a square hole. As a final check a prototype dichroic plate with cross-shaped holes was built and measured. C1 UNIV ILLINOIS,DEPT ELECT & COMP ENGN,ELECTROMAGNET COMMUN LAB,URBANA,IL 61801. SANDIA NATL LABS,DIV 2753,ALBUQUERQUE,NM 87185. RP EPP, LW (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUN PY 1994 VL 42 IS 6 BP 878 EP 882 DI 10.1109/8.301716 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NY452 UT WOS:A1994NY45200018 ER PT J AU STOUDT, DC BRINKMANN, RP ROUSH, RA MAZZOLA, MS ZUTAVERN, FJ LOUBRIEL, GM AF STOUDT, DC BRINKMANN, RP ROUSH, RA MAZZOLA, MS ZUTAVERN, FJ LOUBRIEL, GM TI EFFECTS OF 1-MEV NEUTRON-IRRADIATION ON THE OPERATION OF A BISTABLE OPTICALLY CONTROLLED SEMICONDUCTOR SWITCH (BOSS) SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID SEMI-INSULATING GAAS; GALLIUM-ARSENIDE; ELECTRON; SPECTROSCOPY; DEFECTS AB Recent subnanosecond-opening results of the bistable optically controlled semiconductor switch (BOSS) are presented. The processes of persistent photoconductivity followed by photo-quenching have been demonstrated in copper-compensated, silicon-doped, semi-insulating gallium arsenide (GaAs:Si:Cu). These processes allow a switch to be developed that can be closed by the application of one laser pulse (lambda = 1.06 mum) and opened by the application of a second laser pulse with a wavelength equal to twice that of the first laser. The opening phase is a two-step process which relies initially on the absorption of the 2-13-mum laser and finally on the recombination of electrons in the conduction band with holes in the valance band. The second step requires a sufficient concentration of recombination centers in the material for opening to occur in the subnanosecond regime. This report discusses the effects of 1-MeV neutron irradiation on the BOSS material for the purpose of recombination center generation. Initial experiments indicated a reduction of the recombination time from several nanoseconds down to about 250 ps. Both experimental and theoretical results are presented. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. SIEMENS AG,MUNICH,GERMANY. RP STOUDT, DC (reprint author), NAVAL SURFACE WARFARE CTR,DAHLGREN DIV,PULSED POWER SYST & TECHNOL GRP,DAHLGREN,VA 22448, USA. RI Brinkmann, Ralf Peter/C-5926-2008 NR 27 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUN PY 1994 VL 41 IS 6 BP 913 EP 919 DI 10.1109/16.293301 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA NR955 UT WOS:A1994NR95500008 ER PT J AU GRIBBLE, DL HERZOG, JH AF GRIBBLE, DL HERZOG, JH TI A RISC ARCHITECTURE FOR HIGH-SPEED DATA-ACQUISITION SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article AB A RISC architecture specifically designed for selective storage of high-speed digital words is presented. A specialized instruction set is created to allow programmable control of trigger conditions and storage memory. A RISC architecture is required to execute the instruction set and maintain a 10-MHz sample rate. The utility of the RISC system is illustrated by implementing both analog and digital data acquisitions. A prototype system was designed and fabricated for evaluation. Features of this design are presented. C1 OREGON STATE UNIV, DEPT ELECT & COMP ENGN, CORVALLIS, OR 97331 USA. RP GRIBBLE, DL (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD JUN PY 1994 VL 43 IS 3 BP 457 EP 462 DI 10.1109/19.293467 PG 6 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA NV969 UT WOS:A1994NV96900014 ER PT J AU WILSON, SK DELAY, P AF WILSON, SK DELAY, P TI A METHOD TO IMPROVE CATHODE-RAY OSCILLOSCOPE ACCURACY SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Note AB Distortion in cathode ray oscilloscopes limits the achieved accuracy in spite of piecewise linear correction. Polynomial functions for static and timebase nonlinearity corrections can achieve 4 to 5 times improvement in accuracy compared to only about 2 times improvement for linear correction. For fast transient waveform recording this improvement is important in increasing dynamic range and decreasing waveform noise. C1 FRENCH COMMISARIUT ENERGIE ATOM,BRUYERES CHATEL,FRANCE. RP WILSON, SK (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 7 TC 9 Z9 9 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD JUN PY 1994 VL 43 IS 3 BP 483 EP 486 DI 10.1109/19.293473 PG 4 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA NV969 UT WOS:A1994NV96900019 ER PT J AU BIRCH Jr SIMONIS, GJ AFSAR, MN CLARKE, RN DUTTA, JM FROST, HM GERBAUX X HADNI, A HALL, WF HEIDINGER, R HO, WW JONES, CR KONIGER, F MOORE, RL MATSUO, H NAKANO, T RICHTER, W SAKAI, K STEAD, MR STUMPER, U VIGIL, RS WELLS, TB AF BIRCH, JR SIMONIS, GJ AFSAR, MN CLARKE, RN DUTTA, JM FROST, HM GERBAUX, X HADNI, A HALL, WF HEIDINGER, R HO, WW JONES, CR KONIGER, F MOORE, RL MATSUO, H NAKANO, T RICHTER, W SAKAI, K STEAD, MR STUMPER, U VIGIL, RS WELLS, TB TI AN INTERCOMPARISON OF MEASUREMENT TECHNIQUES FOR THE DETERMINATION OF THE DIELECTRIC-PROPERTIES OF SOLIDS AT NEAR MILLIMETER WAVELENGTHS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB The results of a measurement intercomparison aimed at assessing the systematic errors in near-millimetre-wavelength dielectric measurements on reasonably transparent solid specimens are presented and discussed. Various monochromatic, broad band, guided wave and free space measurement methods were intercompared in the frequency region from 30 to 900 GHz using round-robin measurements of the refractive index and absorption coefficient of 7 specimens. Typically, systematic errors of up to 1% were found in the refractive index results, while very much larger systematic errors were found in the absorption results. C1 MIT, CAMBRIDGE, MA 02139 USA. HARRY DIAMOND LABS, ADELPHI, MD 20783 USA. N CAROLINA CENT UNIV, DEPT PHYS, DURHAM, NC 27707 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. ROCKWELL INT CORP, THOUSAND OAKS, CA 91360 USA. FORSCHUNGSZENTRUM JULICH, W-5170 JULICH 1, GERMANY. OSAKA UNIV, SUITA, OSAKA 565, JAPAN. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. GEORGIA TECH RES INST, ATLANTA, GA 30332 USA. NAGOYA UNIV, NAGOYA, AICHI 464, JAPAN. PHYS TECH BUNDESANSTALT, W-3300 BRAUNSCHWEIG, GERMANY. UNIV NANCY 1, F-54506 VANDOEUVRE LES NANCY, FRANCE. RP BIRCH Jr (reprint author), NATL PHYS LAB, TEDDINGTON TW11 0LW, MIDDX, ENGLAND. RI Afsar, Mohammed/H-5930-2013 NR 15 TC 39 Z9 39 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUN PY 1994 VL 42 IS 6 BP 956 EP 965 DI 10.1109/22.293563 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA NV883 UT WOS:A1994NV88300005 ER PT J AU HIETALA, VM MARTENS, JS PLUT, TA TIGGES, CP ZIPPERIAN, TE GINLEY, DS TRUMAN, JK AF HIETALA, VM MARTENS, JS PLUT, TA TIGGES, CP ZIPPERIAN, TE GINLEY, DS TRUMAN, JK TI HIGH-TEMPERATURE SUPERCONDUCTING SLOW-WAVE COPLANAR TRANSMISSION-LINES WITH NORMAL-METAL CROSSBARS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID MICROWAVE APPLICATIONS; FILMS AB A novel super-conducting slow-wave transmission line has been prepared by overlaying a superconducting coplanar waveguide with normal metal crossbars. The crossbars increase the energy storage along the transmission line, reducing the line's group velocity allowing for shorter delay lines. Additionally, the cross-sectional dimensions of the line are smaller than typical transmission line structures, allowing for a further reduction of delay line size. Measurements show a group velocity of about 0.12 the speed of light with low dispersion, a 25 OMEGA characteristic impedance, and moderate transmission loss. Because the group velocity is largely independent of any properties of the superconductor, these transmission lines exhibit excellent temperature stability and delay reproducibility. C1 CONDUCTUS INC,SUNNYVALE,CA 94086. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. SANDIA NATL LABS,COMPOUND SEMICOND DEVICE GRP,ALBUQUERQUE,NM 87185. RP HIETALA, VM (reprint author), SANDIA NATL LABS,DEPT COMPOUND SEMICOND TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUN PY 1994 VL 42 IS 6 BP 972 EP 975 DI 10.1109/22.293565 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA NV883 UT WOS:A1994NV88300007 ER PT J AU WINOKUR, PS SHANEYFELT, MR MEISENHEIMER, TL FLEETWOOD, DM AF WINOKUR, PS SHANEYFELT, MR MEISENHEIMER, TL FLEETWOOD, DM TI ADVANCED QUALIFICATION TECHNIQUES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 2nd European Conference on Radiations and their Effects on Components and Systems (RADECS 93) CY SEP 13-16, 1993 CL ST MALO, FRANCE ID SINGLE EVENT UPSETS; HARDNESS ASSURANCE; X-RAY; MOS DEVICES; POSTIRRADIATION RESPONSE; SPACE ENVIRONMENTS; RADIATION; INTERFACE; CMOS; CO-60 AB This paper demonstrates use of the Qualified Manufacturers List (QML) methodology to qualify commercial and military microelectronics for use in space applications. QML ''builds in'' the hardness of product through statistical process control (SPC) of technology parameters relevant to the radiation response, test structure to integrated circuit (IC) correlations, and techniques for extrapolating laboratory test results to low-dose-rate space scenarios. Each of these elements is demonstrated and shown to be a cost-effective alternative to expensive end-of-line IC testing. Several examples of test structure-to-IC correlations are provided and recent work on complications arising from transistor scaling and geometry is discussed. The use of a 10-keV x-ray wafer-level test system to support SPC and establish ''process capability'' is illustrated and a comparison of 10-keV x-ray and Co-60 gamma irradiations is provided for a wide range of CMOS technologies. The x-ray tester is shown to be cost-effective and its use in lot acceptance/qualification is recommended. Finally, a comparison is provided between MIL-STD-883, Test Method 1019.4, which governs the testing of packaged semiconductor microcircuits in the DoD, and ESA/SCC Basic Specification No. 22900, Europe's Total Dose Steady-State Irradiation Test Method. Test Method 1019.4 focuses on conservative estimates of MOS hardness for space and tactical applications, while Basic Specification 22900 focuses on improved simulation of low-dose-rate space environments. RP WINOKUR, PS (reprint author), SANDIA NATL LABS,DEPT 1332,ALBUQUERQUE,NM 87185, USA. NR 42 TC 26 Z9 26 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD JUN PY 1994 VL 41 IS 3 BP 538 EP 548 DI 10.1109/23.299796 PN 1 PG 11 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA NU414 UT WOS:A1994NU41400019 ER PT J AU DERENZO, SE MOSES, WW BLANKESPOOR, SC ITO, M OBA, K AF DERENZO, SE MOSES, WW BLANKESPOOR, SC ITO, M OBA, K TI DESIGN OF A PULSED X-RAY SYSTEM FOR FLUORESCENT LIFETIME MEASUREMENTS WITH A TIMING ACCURACY OF 109 PS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID SCINTILLATORS AB We describe the design of a table-top pulsed X-ray system for measuring fluorescent lifetime and wavelength spectra of samples in both crystal and powered form. The novel element of the system is a light-excited X-ray tube with a tungsten anode at +30 kV potential. The S-20 photocathode is excited by a laser diode with a maximum rate of 10 MHz, each pulse having < 100 ps fwhm (full-width at half-maximum) and > 10(7) photons. In a collimated 2 mm x 2 mm beam spot 40 mm from the anode we expect > 1 X-ray per pulse. A sample is exposed to these X-rays and fluorescent photons are detected by a microchannel PMT with a photoelectron transit time spread of 60 ps fwhm, a sapphire window, and a bialkali photocathode (wavelength range 180-600 nm). The combined time spread of a laser diode, the X-my tube, and a microchannel tube has been measured to be 109 ps fwhm. To measure fluorescent wavelength spectra, a reflection grating monochromator is placed between the sample and the PMT. C1 HAMAMATSU PHOTON KK,HAMAMATSU,JAPAN. RP DERENZO, SE (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 33 Z9 35 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD JUN PY 1994 VL 41 IS 3 BP 629 EP 631 DI 10.1109/23.299812 PN 2 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA NU415 UT WOS:A1994NU41500001 ER PT J AU BRANNON, PJ AF BRANNON, PJ TI TRANSIENT RADIATION-INDUCED ABSORPTION AT 1061-NM IN LINBO3 AND MGO-LINBO3 SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID LITHIUM-NIOBATE; IRRADIATED LINBO3; SINGLE-CRYSTALS; DEFECTS; CENTERS AB The transient radiation-induced 1061 nm absorption in pure and MgO doped lithium niobate has been measured using Sandia National Laboratories' SPR III pulsed nuclear reactor. The samples are subjected to neutron fluences up to 10(13)/cm2 (1 MeV Si) and total doses up to 7.5 krad. By using various shields, it has been found that gamma rays are the major contributors to the induced absorption at this wavelength. A plot of the natural logarithm of the transmittance versus time is given along with the peak induced absorption coefficient versus dose. The data indicate color centers with different time dependencies. A log-log plot of the transmission loss in dB/cm versus time indicates a 1/t1/4 time dependence initially. RP SANDIA NATL LABS, DEPT 1128, POB 5800, MS 0601, ALBUQUERQUE, NM 87185 USA. NR 28 TC 2 Z9 2 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD JUN PY 1994 VL 41 IS 3 BP 641 EP 647 PN 2 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA NU415 UT WOS:A1994NU41500004 ER PT J AU PHAM, H MALON, DM AF PHAM, H MALON, DM TI OPTIMAL-DESIGN OF SYSTEMS WITH COMPETING FAILURE MODES SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE K-OUT-OF-N SYSTEM; MAJORITY SYSTEM; MEAN SYSTEM COST; SYSTEM RELIABILITY; OPTIMIZATION; OPTIMAL DESIGN; COMPETING FAILURE MODES ID SHORT-CIRCUIT RELIABILITY; 2 KINDS; SUBJECT AB Consider the problem of achieving optimal system size, n, and threshold value, k, for {k,n - k + 1}-out-of-n & majority systems with competing failure modes. Components are s-independent and identically distributed, and the two system failure modes can have different costs. We determine optimal k, given n; optimal n, given k; and optimal k,n. Optimal implies minimum mean system cost for the {k,n -k+ 1}-out-of-n or majority system. We study the behavior of the optimal k as a function of failure probabilities, and of maximizing the reliability of majority systems. Numerical examples illustrate the results. C1 ARGONNE NATL LAB,DEPT COMP & TELECOMMUN,ARGONNE,IL 60439. RP PHAM, H (reprint author), RUTGERS STATE UNIV,DEPT IND ENGN,POB 909,PISCATAWAY,NJ 08855, USA. NR 10 TC 15 Z9 15 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD JUN PY 1994 VL 43 IS 2 BP 251 EP 254 DI 10.1109/24.295001 PG 4 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NW833 UT WOS:A1994NW83300014 ER PT J AU CUNNINGHAM, GS WILLIAMS, WJ AF CUNNINGHAM, GS WILLIAMS, WJ TI KERNEL DECOMPOSITION OF TIME-FREQUENCY DISTRIBUTIONS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article ID WIGNER DISTRIBUTION; SIGNAL ANALYSIS; FOURIER-TRANSFORM; REPRESENTATIONS; TOOL; LOCALIZATION AB Bilinear time-frequency distributions (TFD's) offer improved time-frequency resolution over linear representations, but suffer from difficult interpretation, higher implementation cost, and the lack of associated low-cost signal synthesis algorithms. In this paper, we introduce some new tools for the interpretation and quantitative comparison of high-resolution TFD's. These tools are used in related work to define low-cost high-resolution TFD's and to define linear, low-cost signal synthesis algorithms associated with high-resolution TFD's. First, each real-valued TFD is associated with a self-adjoint linear operator psi. The spectral representation of psi expresses the TFD as a weighted sum of spectrograms (SP's). It is shown that the SP decomposition and Weyl correspondence do not yield useful interpretations for high-resolution TFD's due to the fact that psi is not positive. C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,ANN ARBOR,MI 48109. RP CUNNINGHAM, GS (reprint author), LOS ALAMOS NATL LAB,DX-13 HYDRODYNAM SECT,LOS ALAMOS,NM 87545, USA. RI Cunningham, Gregory/F-1017-2011 OI Cunningham, Gregory/0000-0001-8819-4345 NR 50 TC 34 Z9 35 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD JUN PY 1994 VL 42 IS 6 BP 1425 EP 1442 DI 10.1109/78.286958 PG 18 WC Engineering, Electrical & Electronic SC Engineering GA NR961 UT WOS:A1994NR96100011 ER PT J AU CUNNINGHAM, GS WILLIAMS, WJ AF CUNNINGHAM, GS WILLIAMS, WJ TI FAST IMPLEMENTATIONS OF GENERALIZED DISCRETE TIME-FREQUENCY DISTRIBUTIONS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article ID WIGNER DISTRIBUTION; SIGNAL ANALYSIS; KERNELS; TOOL; REPRESENTATIONS AB Cohen's class of time-frequency distributions (TFD's) have significant potential for the analysis of complex signals. In order to evaluate the TFD of a signal using its samples, discrete-time TFD's (DTFD's) have been defined as the Fourier transform of a smoothed discrete autocorrelation. Existing algorithms evaluate real-valued DTFD's using FFT's of the conjugate-symmetric autocorrelation. Although the computation required to smooth the autocorrelation is often greater than that for the FFT, there are no widely applicable fast algorithms for this part of the processing. Since the FFT is relatively inexpensive, downsampling is ineffective for reducing computation. If the DTFD needs only to be evaluated at a few frequencies for each time instant, the cost per time-frequency sample can be extremely high. We introduce two approaches for reducing the computation time of DTFD's. First, we define approximations to real-valued DTFD's, using spectrograms, that admit fast, space-saving evaluations. Frequency downsampling reduces the computation time of these approximations. Next, we define DTFD's that admit fast evaluations over sparse sets of time-frequency samples. A single STFT is calculated in order for DTFD time-frequency samples to be evaluated at an additional, fixed cost per sample. C1 UNIV MICHIGAN,ANN ARBOR,MI 48109. RP CUNNINGHAM, GS (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Cunningham, Gregory/F-1017-2011 OI Cunningham, Gregory/0000-0001-8819-4345 NR 31 TC 26 Z9 28 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD JUN PY 1994 VL 42 IS 6 BP 1496 EP 1508 DI 10.1109/78.286965 PG 13 WC Engineering, Electrical & Electronic SC Engineering GA NR961 UT WOS:A1994NR96100018 ER PT J AU DRAPER, JV AF DRAPER, JV TI HAND ACCELERATION IMPULSE BANDWIDTH DURING TARGET ACQUISITION - IMPLICATIONS FOR TELEOPERATOR BANDWIDTH REQUIREMENTS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Letter ID MOVEMENTS AB The purpose of this experiment was to provide data about bandwidth requirements for teleoperators. During teleoperation, user inputs are changes in forces applied to the master controller arising from changes in hand acceleration during execution of goal-directed trajectories, so human hand acceleration bandwidth sets an upper bound on teleoperator feedforward bandwidth requirements. Participants completed a set of computerized target acquisition tasks using a mouse, and the computer recorded the cursor trajectory. Movement time, positioning error, the number of acceleration-deceleration impulses, impulse bandwidth, impulse amplitude, and impulse period were calculated from the trajectory trace. As many as 6 accleration-deceleration impulses occurred during a single target acquisition, but in most trials (96.8%) there were 4 or fewer. The average acceleration-deceleration impulse bandwidth was 5.63 Hz for the first impulse and 9.20 Hz for subsequent impulses. The average period was 265 ms (3.77 Hz) for the first impulse and 218 ms (4.59 Hz) for succeeding ones. Therefore, to completely capture hand trajectories, master controllers and slave arms must have acceleration bandwidth higher than 9.20 Hz. However, it may be that only the joints closest to the end-effector need to accommodate the highest bandwidths and ''shoulder'' joints may only need to accommodate 5.63 Hz acceleration bandwidth. RP DRAPER, JV (reprint author), OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,OAK RIDGE,TN 37831, USA. NR 28 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD JUN PY 1994 VL 24 IS 6 BP 931 EP 936 DI 10.1109/21.293512 PG 6 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NV241 UT WOS:A1994NV24100009 ER PT J AU SCHRENZEL, MD WATSON, JL FERRICK, DA AF SCHRENZEL, MD WATSON, JL FERRICK, DA TI CHARACTERIZATION OF HORSE (EQUUS-CABALLUS) T-CELL RECEPTOR-BETA CHAIN GENES SO IMMUNOGENETICS LA English DT Article ID VARIABLE REGION GENES; V-BETA; ANTIGEN RECEPTOR; NUCLEOTIDE-SEQUENCE; CONSTANT-REGION; GLOBIN GENE; DIVERSITY; ORGANIZATION; ALPHA; RAT AB Genes encoding the horse (Equus caballus) T-cell receptor beta chain (TCRB) were cloned and char acterized. Of 33 cDNA clones isolated from the mesenteric lymph node, 30 had functionally rearranged gene segments, and three contained germline sequences. Sixteen unique variable segments (TCRBV), 14 joining genes (TCRBJ), and two constant region genes (TCRBC) were identified. Horse TCRBV were grouped into nine families based on similarity to human sequences. TCRBV2 and TCRBV12 were the most commonly represented horse families. Analysis of pre dieted protein structure revealed the presence of conserved regions similar to those seen in TCRB of other species. A decanucleotide promoter sequence homologous to those found in humans and mice was located in the 5' un translated region of one horse gene. Germline sequences included the 5' region of the TCRBD2 gene with flanking heptamer/nonamer recombination signals and portions of the TCRBJ2-C2 intron. Southern blot hybridizations demonstrated restriction fragment length polymorphisms at the TCRBC locus among different horse breeds. RP SCHRENZEL, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT PATHOL MICROBIOL & IMMUNOL,HARING HALL,DAVIS,CA 95616, USA. NR 50 TC 14 Z9 14 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0093-7711 J9 IMMUNOGENETICS JI Immunogenetics PD JUN PY 1994 VL 40 IS 2 BP 135 EP 144 PG 10 WC Genetics & Heredity; Immunology SC Genetics & Heredity; Immunology GA NR669 UT WOS:A1994NR66900008 PM 7913080 ER PT J AU BAUGHMAN, AV GADGIL, AJ NAZAROFF, WW AF BAUGHMAN, AV GADGIL, AJ NAZAROFF, WW TI MIXING OF A POINT-SOURCE POLLUTANT BY NATURAL-CONVECTION FLOW WITHIN A ROOM SO INDOOR AIR-INTERNATIONAL JOURNAL OF INDOOR AIR QUALITY AND CLIMATE LA English DT Article DE ENVIRONMENTAL TOBACCO SMOKE; MIXING; NATURAL CONVECTION; TRACER GAS ID INDOOR AIR AB Indoor air quality models are commonly based on the assumption of instantaneous and complete air mixing within a zone. Such an assumption is not appropriate for all circumstances, such as investigating the utility of segregating smokers to reduce nonsmoker exposure to environmental tobacco smoke. This experimental study characterizes quantitatively the rate at which smoke from a cigarette disperses within an unoccupied, 31-m3, low air-exchange rate room under natural convection flow conditions. Sidestream smoke from a smoldering cigarette was simulated with a pulsed release of a tracer gas - a neutrally buoyant mixture of sulfur hexafluoride (SF6) in helium - above an electrically heated coil. During each experimental run, sequential air samples were collected remotely, using gas-tight syringes, from 41 locations within the room. After each run, these samples were analyzed for SF6 content using a gas chromatograph with an electron-capture detector. Duplicate runs were conducted under three conditions: nearly isothermal surfaces; convection from a 500-watt heater; and convection from incoming solar radiation. Characteristic mixing times ranged from 7-10 minutes for the solar radiation case to 80-100 minutes for the nearly isothermal case. C1 UNIV CALIF BERKELEY,DEPT CIVIL ENGN,ENVIRONM ENGN PROGRAM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720. RI Nazaroff, William/C-4106-2008 OI Nazaroff, William/0000-0001-5645-3357 NR 6 TC 48 Z9 49 U1 1 U2 11 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0905-6947 J9 INDOOR AIR JI Indoor Air-Int. J. Indoor Air Qual. Clim. PD JUN PY 1994 VL 4 IS 2 BP 114 EP 122 DI 10.1111/j.1600-0668.1994.t01-2-00006.x PG 9 WC Construction & Building Technology; Engineering, Environmental; Public, Environmental & Occupational Health SC Construction & Building Technology; Engineering; Public, Environmental & Occupational Health GA NV454 UT WOS:A1994NV45400005 ER PT J AU MARKOWITZ, VM AF MARKOWITZ, VM TI SAFE REFERENTIAL INTEGRITY AND NULL CONSTRAINT STRUCTURES IN RELATIONAL DATABASES SO INFORMATION SYSTEMS LA English DT Article AB Referential integrity and null constraints are extensively used in relational databases for expressing existence dependencies between tuples and restrictions on the way nulls appear in relations, respectively. Referential integrity and null constraints can cause the following data manipulation anomalies: (i) referential integrity and null constraints may block the execution of certain data manipulations, although these manipulations would result in consistent database states, and (ii) depending on the order of enforcing the referential integrity constraints, certain data manipulations may result in different database states, thus being unpredictable. In this paper we examine these anomalies and formally develop safeness conditions for avoiding them. RP MARKOWITZ, VM (reprint author), LAWRENCE BERKELEY LAB,DEPT COMP SCI RES & DEV,DIV INFORMAT & COMP SCI,BERKELEY,CA 94720, USA. NR 15 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4379 J9 INFORM SYST JI Inf. Syst. PD JUN PY 1994 VL 19 IS 4 BP 359 EP 378 DI 10.1016/0306-4379(94)90019-1 PG 20 WC Computer Science, Information Systems SC Computer Science GA NY695 UT WOS:A1994NY69500003 ER PT J AU FORRESTAL, MJ TZOU, DY LI, J AF FORRESTAL, MJ TZOU, DY LI, J TI A COUNTERINTUITIVE REGION OF RESPONSE FOR ELASTIC-PLASTIC RINGS LOADED WITH AXISYMMETRICAL PRESSURE PULSES SO INTERNATIONAL JOURNAL OF IMPACT ENGINEERING LA English DT Article AB We modeled the elastic-plastic response of 6061-T6 aluminium rings loaded with internal, axisymmetric, short-duration pressure pulses. Our analysis used stress-strain data for specimens pulled beyond tensile yield, unloaded, and then compressed beyond compressive yield. These reverse loading data showed the classical Bauschinger effect, where compressive yield was significantly lower than tensile yield. We presented elastic-plastic response predictions for a 6 mus duration, sine-squared pressure pulse that closely approximates that in previously published data. For a range of pressure pulse amplitudes beyond that required to cause yielding, our axisymmetric response model predicted final radial displacements that were radially inward or opposite in direction to the pressure pulses. For larger pulse amplitudes, final radial displacements were radially outward or in the direction of the pressure pulses. C1 UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131. RP FORRESTAL, MJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0734-743X J9 INT J IMPACT ENG JI Int. J. Impact Eng. PD JUN PY 1994 VL 15 IS 3 BP 219 EP 223 DI 10.1016/S0734-743X(05)80014-4 PG 5 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA NR707 UT WOS:A1994NR70700003 ER PT J AU FYE, RM AF FYE, RM TI PROJECTOR APPROXIMATION AND QUANTUM MONTE-CARLO SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C-PHYSICS AND COMPUTERS LA English DT Article ID MODEL AB We derive a general approximation for performing quantum Monte Carlo simulations within a desired subspace of the full Hilbert space. We analytically determine the form of the resulting systematic error, allowing controlled extrapolation to exact results. We discuss some numerical applications, including fermion impurity and lattice models with infinite on-site Colulomb repulsion U and quantum spin systems. We demonstrate the use of the approximation in simulations with a test model. RP FYE, RM (reprint author), SANDIA NATL LABS,DEPT 1421,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0129-1831 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C-Phys. Comput. PD JUN PY 1994 VL 5 IS 3 BP 483 EP 488 DI 10.1142/S0129183194000660 PG 6 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NW874 UT WOS:A1994NW87400003 ER PT J AU GUBERNATIS, JE ZHANG, XY AF GUBERNATIS, JE ZHANG, XY TI NEGATIVE WEIGHTS IN QUANTUM MONTE-CARLO SIMULATIONS AT FINITE-TEMPERATURES USING THE AUXILIARY FIELD METHOD SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C-PHYSICS AND COMPUTERS LA English DT Review ID HUBBARD-STRATONOVICH TRANSFORMATION; FERMION SIGN PROBLEM; NUMERICAL-SIMULATION; ELECTRON SYSTEMS; MODEL; DISCRETE AB We study the conditions under which negative weights (the sign problem) can exist in the finite-temperature, auxiliary field, quantum Monte Carlo algorithm of Blankenbecler, Scalapino, and Sugar. We specifically consider whether the sign problem arises from round-off error resulting from operations involving very ill-conditioned matrices or from topological defects in the auxiliary fields mirroring the space-time patterns of the physical fields. While we demonstrate these situations can generate negative weights, the results of our numerical tests suggest that these factors are most likely not the dominant sources of the problem. We also argue that the negative weights should not be considered as just a fermion problem. If it exists for the fermion problem, it will also exist for an analogous boson problem. C1 RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08854. RP GUBERNATIS, JE (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 33 TC 4 Z9 4 U1 0 U2 4 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0129-1831 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C-Phys. Comput. PD JUN PY 1994 VL 5 IS 3 BP 599 EP 613 DI 10.1142/S0129183194000775 PG 15 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NW874 UT WOS:A1994NW87400014 ER PT J AU Joshi, PK Zganjar, EF Rupnik, D Robinson, SJ Mantica, PF Carter, HK Kormicki, J Gill, RL Walters, WB Bingham, CR Ramayya, AV Ma, WC Hamilton, JH AF Joshi, P. K. Zganjar, E. F. Rupnik, D. Robinson, S. J. Mantica, P. F. Carter, H. K. Kormicki, J. Gill, R. L. Walters, W. B. Bingham, C. R. Ramayya, A. V. Ma, W. C. Hamilton, J. H. TI LIFETIMES OF THE 0(2)(+) CONFIGURATION IN Hg-186 AND Hg-188 SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS LA English DT Article AB A new picosecond lifetime measurement system developed at UNISOR was used to determine the half-life of the well-deformed 0(2)(+) levels in Hg-188 and Hg-186. The half-life values were measured to be 204 +/- 45 ps in Hg-188 and <= 52 ps in Hg-186. The corresponding values of rho(2) (E0) X 103, obtained from the partial half-lives, were 7.7(-3.2)(+2.2): and >= 32, respectively. Additionally, the half-lives of the 2(2)(+) levels were determined to be 141 +/- 31 pa in Hg-188 and 48 +/- 27 Ps in Hg-186. C1 [Joshi, P. K.; Zganjar, E. F.; Rupnik, D.] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. [Robinson, S. J.] Tennessee Technol Univ, Dept Phys, Cookeville, TN 38505 USA. [Mantica, P. F.; Carter, H. K.; Kormicki, J.] Oak Ridge Inst Sci & Educ, UNISOR, Oak Ridge, TN 37831 USA. [Gill, R. L.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. [Walters, W. B.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA. [Bingham, C. R.] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. [Ramayya, A. V.; Ma, W. C.; Hamilton, J. H.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. RP Joshi, PK (reprint author), Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. FU U.S. Department of Energy [DE-FG05-88ER40418, DE-FG05-84ER40159, DE-AS05-76ER03346, DE-AC05-84OR21400, DR-FG05-87ER40361, DE-AC02-76CH00016, DE-FG05-88-ER40407, DE-AC05-76OR00033]; UNISOR is a consortium of 13 universities; State of Tennessee, Oak Ridge Associated Universities; Oak Ridge National Laboratory; Oak Ridge Associated Universities FX This work was supported by the U.S. Department of Energy under the contract numbers DE-FG05-88ER40418, DE-FG05-84ER40159, DE-AS05-76ER03346, DE-AC05-84OR21400, DR-FG05-87ER40361, DE-AC02-76CH00016, and DE-FG05-88-ER40407. UNISOR is a consortium of 13 universities, State of Tennessee, Oak Ridge Associated Universities, and Oak Ridge National Laboratory, and is partially supported by them and by the U.S. Department of Energy under Contract No. DE-AC05-76OR00033 with the Oak Ridge Associated Universities. We would like to acknowledge the technical assistance provided by Mark Whitley and Jim Blankenship of Oak Ridge National Laboratory in setting up the timing system. NR 19 TC 13 Z9 13 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-3013 EI 1793-6608 J9 INT J MOD PHYS E JI Int. J. Mod. Phys. E-Nucl. Phys. PD JUN PY 1994 VL 3 IS 2 BP 757 EP 767 DI 10.1142/S021830139400019X PG 11 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V37QR UT WOS:000209290800006 ER PT J AU Schauer, W Weber, M von Egidy, T Georgii, R Ott, J Schrunder, S Borner, HG Hoff, RW Faber, S Graw, G Hofer, D Kokowski, R Muller-Zanotti, E Oelmaier, W Valnion, B AF Schauer, W. Weber, M. von Egidy, T. Georgii, R. Ott, J. Schruender, S. Boeorner, H. G. Hoff, R. W. Faber, S. Graw, G. Hofer, D. Kokowski, R. Mueller-Zanotti, E. Oelmaier, W. Valnion, B. TI THE LEVEL SCHEME OF Tm-171 STUDIED BY MULTIPLE NEUTRON CAPTURE AND THE (He-3,d) REACTION SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS LA English DT Article AB The double neutron capture reaction Tm-169(n, gamma)Tm-170(n, gamma)Tm-171 and the proton transfer reaction Er-170(He-3,d)Tm-171 were used to study nudear levels in Tm-171. The level scheme up to 1 MeV was confirmed and very precise level energies were determined. The results are compared with the quasipartide-phonon model. Evidence was found, that the 1/2(-)[541) orbit has larger deformation than the other states. C1 [Schauer, W.; Weber, M.; von Egidy, T.; Georgii, R.; Ott, J.; Schruender, S.] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany. [Boeorner, H. G.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. [Hoff, R. W.] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Faber, S.; Graw, G.; Hofer, D.; Kokowski, R.; Mueller-Zanotti, E.; Oelmaier, W.; Valnion, B.] Univ Munich, Sekt Phys, D-85748 Garching, Germany. RP Schauer, W (reprint author), Tech Univ Munich, Dept Phys, D-85748 Garching, Germany. NR 14 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-3013 EI 1793-6608 J9 INT J MOD PHYS E JI Int. J. Mod. Phys. E-Nucl. Phys. PD JUN PY 1994 VL 3 IS 2 BP 793 EP 800 DI 10.1142/S021830139400022X PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V37QR UT WOS:000209290800009 ER PT J AU UNAL, C BADR, O TUZLA, K CHEN, JC NETI, S AF UNAL, C BADR, O TUZLA, K CHEN, JC NETI, S TI PRESSURE-DROP AT ROD-BUNDLE SPACERS IN THE POST-CHF DISPERSED FLOW REGIME SO INTERNATIONAL JOURNAL OF MULTIPHASE FLOW LA English DT Article DE PRESSURE DROP; GRID SPACER; ROD BUNDLE; DISPERSED FLOW AB The axial pressure drop for two-phase post-CHF dispersed flow along a rod bundle with a straight grid spacer was investigated experimentally. Thermodynamic non-equilibrium was considered in both the measurements and data analysis. The effects of Reynolds number and actual quality on the spacer pressure drop were also investigated. Experimental data on the frictional pressure drop in the unblocked section (e.g. without spacer) compared favorably with four well-known models. On the other hand, all available models substantially underpredicted the experimental pressure drop at the grid spacer. These deviations were attributed mainly to differences in flow patterns and heating conditions (diabatic vs adiabatic). Pressure drop values which are 300% higher than those predicted by Beattie's model were suggested for post-CHF dispersed flow in straight grid spacers. C1 UNITED ARAB EMIRATES UNIV, AL AIN, U ARAB EMIRATES. LEHIGH UNIV, INST THERMOFLUID ENGN & SCI, BETHLEHEM, PA 18015 USA. RP LOS ALAMOS NATL LAB, SCI APPLICAT INT CORP, MAIL STOP K555, LOS ALAMOS, NM 87545 USA. NR 21 TC 1 Z9 1 U1 2 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0301-9322 EI 1879-3533 J9 INT J MULTIPHAS FLOW JI Int. J. Multiph. Flow PD JUN PY 1994 VL 20 IS 3 BP 515 EP 522 DI 10.1016/0301-9322(94)90025-6 PG 8 WC Mechanics SC Mechanics GA NU523 UT WOS:A1994NU52300005 ER PT J AU MUSTAFI, R HEATON, D BRINKMAN, W SCHWARTZ, JL AF MUSTAFI, R HEATON, D BRINKMAN, W SCHWARTZ, JL TI ENHANCEMENT OF X-RAY TOXICITY IN SQUAMOUS-CELL CARCINOMA CELL-LINES BY DNA-POLYMERASE INHIBITORS SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID HUMAN-TUMOR-CELLS; MYELOID-LEUKEMIA CELLS; BETA-ARABINOFURANOSYLADENINE; RADIATION SENSITIVITY; ARA-A; REPAIR; 1-BETA-D-ARABINOFURANOSYLCYTOSINE; RADIOTHERAPY; GROWTH; HEAD AB The effect of the DNA polymerase inhibitors adenine 9-beta-arabinofurasonide (ara-A), cytosine 1-beta-arabinofuranoside (ara-C), and aphidicolin on X-radiation sensitivity was studied in a group of exponentially growing squamous cell carcinoma cell lines. The tumour cell lines varied in radiation sensitivity, with D-0 (radiation sensitivity) values ranging from 1.0 to 3.9 Gy. The addition of non-toxic concentrations of ara-A 30 min before irradiation and removal 30 min after irradiation potentiated cell killing in five of eight cell lines. Four of these five responsive cell lines were relatively radioresistant lines, having D-0 > 2.0 Gy. One of the cell lines was more radiosensitive (D-0 = 1.4 Gy). Ara-A was also effective in potentiating killing in the radioresistant cell lines even when added 60 min after irradiation. Pre- or post-treatment with ara-A had no effect on X-ray sensitivity of the other three relatively sensitive cell lines (D-0 ranging from 1.0 to 1.3 Gy). Both ara-C and aphidicolin were effective in potentiating X-ray sensitivity in JSQ-3, a relatively resistant cell line that was sensitized by ara-A treatment, but they had no effect on the X-ray sensitivity of SCC-61, a relatively radiosensitive cell line that was insensitive to ara-A effects on X-ray response. At the concentrations used, the polymerase inhibitors were equally effective in inhibiting DNA synthesis. C1 ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. RUSH UNIV,MED CTR,CHICAGO,IL 60612. FU NCI NIH HHS [NCI CA 42596] NR 22 TC 3 Z9 4 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD JUN PY 1994 VL 65 IS 6 BP 675 EP 681 DI 10.1080/09553009414550791 PG 7 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA NV889 UT WOS:A1994NV88900007 PM 7912717 ER PT J AU HEARST, JR LYNCH, CS AF HEARST, JR LYNCH, CS TI MEASUREMENT OF IN-SITU STRENGTH USING PROJECTILE PENETRATION SO INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS LA English DT Note C1 UNIV CALIF SANTA BARBARA,DEPT MECH ENGN,SANTA BARBARA,CA 93106. RP HEARST, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,L-221,POB 808,LIVERMORE,CA 94551, USA. RI Lynch, Christopher/A-9886-2013 OI Lynch, Christopher/0000-0001-9989-7097 NR 16 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0148-9062 J9 INT J ROCK MECH MIN JI Int. J. Rock Mech. Min. Sci. PD JUN PY 1994 VL 31 IS 3 BP 243 EP 251 DI 10.1016/0148-9062(94)90468-5 PG 9 WC Engineering, Geological; Mining & Mineral Processing SC Engineering; Mining & Mineral Processing GA NU253 UT WOS:A1994NU25300007 ER PT J AU CHANDY, M FOSTER I KENNEDY, K KOELBEL, C TSENG, CW AF CHANDY, M FOSTER, I KENNEDY, K KOELBEL, C TSENG, CW TI INTEGRATED SUPPORT FOR TASK AND DATA PARALLELISM SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article AB We present an overview of research at the Center for Research on Parallel Computation designed to provide an efficient, portable programming model for scientific applications possessing both task and data parallelism. Fortran M programs exploit task parallelism by providing language extensions for user-defined process management and typed communication channels. A combination of compiler and run-time system support ensures modularity, safety, portability, and efficiency. Fortran D and High Performance Fortran programs exploit data parallelism by providing language extensions for user-defined data decomposition specifications, parallel loops, and parallel-array operations. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RICE UNIV, CTR RES PARALLEL COMPUTAT, HOUSTON, TX 77251 USA. RP CHANDY, M (reprint author), CALTECH, CTR RES PARALLEL COMPUTAT, PASADENA, CA 91125 USA. NR 42 TC 9 Z9 9 U1 0 U2 0 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1994 VL 8 IS 2 BP 80 EP 98 DI 10.1177/109434209400800202 PG 19 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA NY494 UT WOS:A1994NY49400002 ER PT J AU CHOI, JY DONGARRA, JJ POZO, R SORENSEN, DC WALKER, DW AF CHOI, JY DONGARRA, JJ POZO, R SORENSEN, DC WALKER, DW TI CRPC RESEARCH INTO LINEAR ALGEBRA SOFTWARE FOR HIGH-PERFORMANCE COMPUTERS SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article ID SUBPROGRAMS; SET AB In this paper we look at a number of approaches being investigated in the Center for Research on Parallel computation (CRPC) to develop linear algebra software for high-performance computers. These approaches are exemplified by the LAPACK, templates, and ARPACK projects. LAPACK is a software library for performing dense and banded linear algebra computations, and was designed to run efficiently on high-performance computers. We focus on the design of the distributed-memory version of LAPACK, and on an object-oriented interface to LAPACK. C1 UNIV TENNESSEE,DEPT COMP SCI,KNOXVILLE,TN 37996. RICE UNIV,DEPT COMPUTAT & APPL MATH,HOUSTON,TX 77251. RP CHOI, JY (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831, USA. RI Walker, David/B-7978-2010; Dongarra, Jack/E-3987-2014; OI Walker, David/0000-0002-1360-6330 NR 39 TC 6 Z9 6 U1 0 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1994 VL 8 IS 2 BP 99 EP 118 DI 10.1177/109434209400800203 PG 20 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA NY494 UT WOS:A1994NY49400003 ER PT J AU SALMON, JK WARREN, MS WINCKELMANS, GS AF SALMON, JK WARREN, MS WINCKELMANS, GS TI FAST PARALLEL TREE CODES FOR GRAVITATIONAL AND FLUID DYNAMICAL N-BODY PROBLEMS SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article ID FAST MULTIPOLE METHOD; 3-D VORTEX METHOD; 3 DIMENSIONS; FLOWS; SIMULATIONS; HALOS AB We discuss two physical systems from different disciplines that make use of the same algorithmic and mathematical structures as a way of reducing the number of operations necessary to complete a realistic simulation. In the gravitational N-body problem, the acceleration of an object is given by the familiar Newtonian laws Of motion and gravitation. The computational load is reduced by treating groups of bodies as single multipole sources rather than as individual bodies. In the simulation of incompressible flows, the flow may be modeled by the dynamics of a set of N interacting vortices. Vortices are vector objects in three dimensions, but their interactions are mathematically similar to that of gravitating masses. The multipole approximation can be used to greatly reduce the time needed to compute the interactions between vortices. Both types of simulations are carried out on the Intel TouchStone Delta, a parallel MIMD computer with 512 processors. Timings are reported for systems of up to 10 million bodies, and demonstrate that the implementation scales well on massively parallel systems. The majority of the code is common to both applications, which differ only in some of the ''physics'' modules. In particular, the code for parallel-tree construction and traversal is shared. C1 CALTECH,GRAD AERONAUT LABS,PASADENA,CA 91125. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SALMON, JK (reprint author), CALTECH,DEPT PHYS,PASADENA,CA 91125, USA. OI Warren, Michael/0000-0002-1218-7904 NR 49 TC 45 Z9 45 U1 0 U2 4 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1994 VL 8 IS 2 BP 129 EP 142 DI 10.1177/109434209400800205 PG 14 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA NY494 UT WOS:A1994NY49400005 ER PT J AU AVERICK, B BISCHOF, C BIXBY, B CARLE, A DENNIS, J ELALEM, M ELBAKRY, A GRIEWANK, A JOHNSON, G LEWIS, R MORE, J TAPIA, R TORCZON, V WILLIAMSON, K AF AVERICK, B BISCHOF, C BIXBY, B CARLE, A DENNIS, J ELALEM, M ELBAKRY, A GRIEWANK, A JOHNSON, G LEWIS, R MORE, J TAPIA, R TORCZON, V WILLIAMSON, K TI NUMERICAL OPTIMIZATION AT THE CENTER-FOR-RESEARCH-ON-PARALLEL-COMPUTATION SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article AB Research in optimization at the CRPC covers a broad range of topics in linear and nonlinear Programming, parameter identification for ordinary and partial differential equations, and multidisciplinary design optimization. Common to all this research is an application-driven approach and an effort to design algorithms to be effective in realistic parallel computing environments. In addition, the optimization group is jointly involved with the CRPC compiler group in the development of an automatic differentiation tool for Fortran programs. C1 RICE UNIV,DEPT COMP SCI,HOUSTON,TX 77251. UNIV S CAROLINA,DEPT MATH,COLUMBIA,SC 29208. RICE UNIV,DEPT COMPUTAT & APPL MATH,HOUSTON,TX 77251. UNIV MINNESOTA,AHPCRC,MINNEAPOLIS,MN 55455. RP AVERICK, B (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Bischof, Christian/D-2897-2009; Dennis, John/A-6910-2008 NR 0 TC 0 Z9 0 U1 0 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1994 VL 8 IS 2 BP 143 EP 153 DI 10.1177/109434209400800206 PG 11 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA NY494 UT WOS:A1994NY49400006 ER PT J AU MOLYNEUX, JE WITTEN, A AF MOLYNEUX, JE WITTEN, A TI IMPEDANCE TOMOGRAPHY - IMAGING ALGORITHMS FOR GEOPHYSICAL APPLICATIONS SO INVERSE PROBLEMS LA English DT Article ID BOUNDARY-VALUE PROBLEM; DETERMINING CONDUCTIVITY; SURFACE MEASUREMENTS AB This paper develops inversion algorithms for use in geophysical applications of electric impedance tomography. Perturbation methods are employed to relate the Fourier transform of the measured surface voltage to the Fourier Laplace transform of the subsurface conductivity. A Tychonov regularization procedure is used to effect the (ill-posed) Laplace inverse transformation. We discuss the wavenumber information obtainable for several inversion geometries (placements of injection and monitoring electrodes), and compare the present results with those obtainable from wave-based diffraction tomography. RP MOLYNEUX, JE (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 8 Z9 8 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0266-5611 J9 INVERSE PROBL JI Inverse Probl. PD JUN PY 1994 VL 10 IS 3 BP 655 EP 667 DI 10.1088/0266-5611/10/3/010 PG 13 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA NR824 UT WOS:A1994NR82400010 ER PT J AU ZHANG, YH SELVAMANICKAM, V LEE, DF SALAMA, K AF ZHANG, YH SELVAMANICKAM, V LEE, DF SALAMA, K TI CRITICAL-CURRENT DEPENDENCE ON DEFORMATION KINETICS IN TEXTURED YBA2CU3OX SUPERCONDUCTOR SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Article DE YBA2CU3OX SUPERCONDUCTOR; HIGH TEMPERATURE DEFORMATION; MELT TEXTURING ID CURRENT-DENSITY; DISLOCATIONS; ENHANCEMENT AB The dependence of critical current on the deformation kinetics has been examined in melt-textured YBa2Cu3Oz superconductors that were subjected to uniaxial high temperature deformation. The J(c) of the deformed superconductors is found to increase with deformation time at ail magnetic field orientations with respect to the a-b plane. The rate of increase in J(c) is found to subside after 12 h of deformation. The deformation time dependence of J(c) has been analyzed within the framework of high temperature creep, and is found to be very similar to the deformation time dependence of mechanical strain. The rate of J(c) increase in the secondary creep stage is found to be significantly higher in the orientation of H//c resulting in a lower anisotropy with increasing deformation time. The J(c) characteristics suggest that an anisotropic defect structure is created after longer periods of deformation, and that the defects responsible for flux pinning are introduced by thermal activation. C1 UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP ZHANG, YH (reprint author), UNIV HOUSTON,DEPT MECH ENGN,HOUSTON,TX 77204, USA. NR 12 TC 10 Z9 10 U1 0 U2 0 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD JUN PY 1994 VL 33 IS 6A BP 3419 EP 3423 DI 10.1143/JJAP.33.3419 PG 5 WC Physics, Applied SC Physics GA PT642 UT WOS:A1994PT64200023 ER PT J AU FREAR, D AF FREAR, D TI OPTOELECTRONIC INTERCONNECTIONS AND PACKAGING - A MATERIALS CHALLENGE SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Note RP FREAR, D (reprint author), SANDIA NATL LABS,DEPT MECH & CORROS MET,ALBUQUERQUE,NM 87185, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUN PY 1994 VL 46 IS 6 BP 40 EP 40 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA NP087 UT WOS:A1994NP08700008 ER PT J AU CARSON, RF SEIGAL, PK CRAFT, DC LOVEJOY, ML AF CARSON, RF SEIGAL, PK CRAFT, DC LOVEJOY, ML TI FUTURE MANUFACTURING TECHNIQUES FOR STACKED MCM INTERCONNECTIONS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB As multichip modules (MCMs) grow in chip count and complexity, increasingly large numbers of input/output (I/O) channels will be required for connection to other MCMs or printed wiring boards. In applications such as digital signal processing, large increases in processing density (number of operations in a given volume) can be obtained in stacked MCM arrangements. The potential pin counts and required I/O densities in these stacked architectures will push beyond the limits of present interlevel coupling techniques. This problem is particularly acute if easy separation of layers is needed to meet MCM testing and yield requirements. Solutions to this problem include the use of laser-drilled, metal-filled electrical vias in the MCM substrate and also optoelectronic data channels that operate in large arrays. These arrays will emit and detect signals traveling perpendicular to the surface of the MCM. All of these approaches will require packaging and alignment that makes use of advanced MCM manufacturing techniques. RP CARSON, RF (reprint author), SANDIA NATL LABS,TECH STAFF,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUN PY 1994 VL 46 IS 6 BP 51 EP 55 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA NP087 UT WOS:A1994NP08700011 ER PT J AU BLAKE, DM AF BLAKE, DM TI NIST EPA GAS-PHASE INFRARED DATABASE SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Database Review RP BLAKE, DM (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUN PY 1994 VL 46 IS 6 BP 64 EP 64 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA NP087 UT WOS:A1994NP08700019 ER PT J AU EMSLEY, L AF EMSLEY, L TI SELECTIVE PULSES AND THEIR APPLICATIONS TO THE ATTRIBUTION OF RESONANCES AND TO STRUCTURE DETERMINATION IN NMR SO JOURNAL DE CHIMIE PHYSIQUE ET DE PHYSICO-CHIMIE BIOLOGIQUE LA French DT Article; Proceedings Paper CT 13th Germ Congress CY MAR 29-APR 03, 1994 CL GIENS, FRANCE ID UNRAVELING OVERLAPPING MULTIPLETS; NUCLEAR-MAGNETIC-RESONANCE; SPIN TOPOLOGY FILTRATION; HIGH-RESOLUTION NMR; NONINTERACTING SPINS; CORRELATION SPECTRA; GAUSSIAN PULSES; SPECTROSCOPY; EXCITATION; INVERSION AB Aspects of shaped selective pulses and their applications in assignment and structure determination by NMR are considered. Specifically, strategies for the design of selective pulses for in-phase excitation are covered. In the simplest case, 270-degrees Gaussian pulses are used to excite a multiplet with only a small residual phase dispersion. In more demanding cases, more complex analytical pulse shapes are discussed. The most succesful pulse shapes to date are described by either a sum of Gaussians, or a Fourier series. Both types of pulse can produce excitation over a very well defined region with virtually no phase dispersion. We also consider multi-dimensional techniques which use shaped pulses to assign resonances, and to derive coupling constants. The soft-COSY experiment is considered in some detail, followed by a brief description of experiments which are designed to simplify complex spectra on die basis of the topologies of networks of coupled spins. The methods are illustrated with examples from peptides and DNA fragments. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Emsley, Lyndon/C-6108-2008 OI Emsley, Lyndon/0000-0003-1360-2572 NR 33 TC 0 Z9 0 U1 0 U2 3 PU EDITIONS SCIENTIFIQUES ELSEVIER PI PARIS CEDEX 15 PA 141 RUE JAVEL, 75747 PARIS CEDEX 15, FRANCE SN 0021-7689 J9 J CHIM PHYS PCB JI J. Chim. Phys.-Chim. Biol. PD JUN PY 1994 VL 91 IS 6 BP 607 EP 624 PG 18 WC Biochemistry & Molecular Biology; Chemistry, Physical SC Biochemistry & Molecular Biology; Chemistry GA NY018 UT WOS:A1994NY01800003 ER PT J AU SASSE, AGBM GADGIL, AJ NAZAROFF, WW AF SASSE, AGBM GADGIL, AJ NAZAROFF, WW TI ON THE MEASUREMENT OF PO-218 DIFFUSIVITY USING THE 2-FILTER METHOD SO JOURNAL OF AEROSOL SCIENCE LA English DT Article ID DECAY PRODUCTS; POLONIUM-218; NEUTRALIZATION AB Determining the diffusion coefficient of Po-218 is an important application of the two-filter method (Thomas and LeClare, 1970, Hlth Phys. 18, 113). Air containing a known concentration of Rn-222 is drawn through a cylindrical tube with filters at both ends. The Po-218 activity on the downstream filter relative to the Rn-222 concentration in air is interpreted to determine the diffusivity of Po-218. Previously, the interpretation scheme was based on a theoretical analysis of Po-218 transport and production in a tube by Tan (1969, Int. J. Heat Mass Trans. 12,471), and Tan and Hsu (1970, Int. J. Heat Mass Trans. 13, 1887). Their analysis did not account for radioactive decay of airborne Po-218 within the apparatus nor for the perturbation of the fluid flow caused by the flow resistance of the downstream filter. Also, simplified analytical air flow profiles were assumed in that analysis. In this paper, the two-filter method is re-analyzed numerically, by solving the continuity equation, the Navier-Stokes equations and the species conservation equation for a tube. Full account is taken of the effects of radioactive decay of Po-218, and the flow resistance of the downstream filter. The results of the new analysis lead to a downward correction of reported diffusivities of Po-218 by about 10-20%. C1 UNIV CALIF BERKELEY,DEPT CIVIL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720. RI Nazaroff, William/C-4106-2008 OI Nazaroff, William/0000-0001-5645-3357 NR 21 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 0021-8502 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD JUN PY 1994 VL 25 IS 4 BP 689 EP 697 DI 10.1016/0021-8502(94)90010-8 PG 9 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NW865 UT WOS:A1994NW86500010 ER PT J AU CONRY, MJ AF CONRY, MJ TI COMPARATIVE EFFECT OF 6 CULTIVARS AT 4 RATES OF NITROGEN ON THE GRAIN-YIELD AND GRAIN QUALITY OF SPRING-SOWN MALTING BARLEY IN IRELAND SO JOURNAL OF AGRICULTURAL SCIENCE LA English DT Article ID GROWTH AB Nine experiments were conducted in the south-east of Ireland on three contrasting soils over a 3-year period (1988-90) to test the effect of six cultivars at four rates of nitrogen on the grain yield and quality (ex-farm) of spring-sown malting barley. Blenheim gave the greatest grain yield and lowest protein on average. Blenheim and Prisma had similar low protein values but Prisma gave significantly lower (P < 0.05) mean grain yields than Blenheim at all three sites. Corniche gave significantly lower (P < 0.05 to 0.01) grain yields than Blenheim in all nine experiments. Choice of cultivar had a considerable effect (< 16 %) on the yield and protein content of malting barley but season and soil type had a much larger effect (2-3 times greater). The application of increasing increments of fertilizer nitrogen generally increased grain protein and screenings significantly (P < 0-05 to 0.01) in all nine experiments but it did not always give increased grain yields. The levels at which nitrogen gave significant grain yield increases depended on season and soil type. Season and soil type had a much larger effect on grain yield and quality than nitrogen rate. It was not possible to relate grain yield to specific climatic factors except on the light textured soil in 1990 when severe moisture stress in the early part of the growing season reduced grain yield by 32.5 % compared with the previous 2-year average. RP CONRY, MJ (reprint author), TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. NR 18 TC 10 Z9 12 U1 1 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0021-8596 J9 J AGR SCI JI J. Agric. Sci. PD JUN PY 1994 VL 122 BP 343 EP 350 PN 3 PG 8 WC Agriculture, Multidisciplinary SC Agriculture GA NR341 UT WOS:A1994NR34100003 ER PT J AU COCKROFT, NJ AF COCKROFT, NJ TI APPLICATION OF ENERGY UP-CONVERSION SPECTROSCOPY TO NOVEL LASER AND PHOSPHOR DESIGN SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID VISIBLE UP-CONVERSION; AVALANCHE UPCONVERSION; GREEN; FIBER; BLUE AB Energy-transfer and sequential-absorption upconversion processes, normally considered detrimental to conventional laser operation, are rapidly emerging as the key to an exciting new class of optical device. Energy-upconversion processes may be designed to take advantage of strong rare earth ion emission transitions in the visible region and of valuable co-incidences with diode-laser outputs in the near-infrared to produce compact visible lasers. This paper reviews the use of sequential-absorption and energy-transfer spectroscopy to derive information that is essential to the optimization of novel device designs as well as 'conventional' laser or phosphor designs. Transfer-rate extraction using upconverted temporal transients, determination of high-lying energy levels using sequential-absorption laser spectroscopy, ion dimer identification by line-narrowing experiments and direct identification of energy storage states using dual-laser techniques are presented. The use of dimer-dominated host crystals, such as CsCdBr3, that can be used to isolate individual energy-transfer rates relevant to the optimization of many different laser types, is emphasized. RP COCKROFT, NJ (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,MAILSTOP E535,LOS ALAMOS,NM 87545, USA. NR 30 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD JUN PY 1994 VL 207 BP 33 EP 40 DI 10.1016/0925-8388(94)90172-4 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500009 ER PT J AU BEITZ, JV AF BEITZ, JV TI F-STATE LUMINESCENCE OF TRIVALENT LANTHANIDE AND ACTINIDE IONS IN SOLUTION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID LASER FLUORESCENCE SPECTROSCOPY; FLUOROZIRCONATE GLASS; SYSTEMATIC ANALYSIS; CURIUM(III) HUMATE; EU(III) COMPLEXES; AQUEOUS-SOLUTIONS; ORGANIC PHASES; EUROPIUM; AMERICIUM; SPECTRA AB Detailed studies of the luminescence of aquated Am3+ are presented in the context of prior work on lanthanide and actinide ions. The luminescing state of aquated Am3+ is confirmed to be 5D1 based on observed emission and excitation spectra. The luminescence lifetime of Am3+ in H2O solution is (22 +/- 3) ns and (155 +/- 4) ns in D2O solution at 295 K. Judd-Ofelt transition intensity theory qualitatively describes the observed Am3+ relative integrated fluorescence intensities. Recent luminescence studies on complexed trivalent f-element ions in solution are reviewed as to the similarities and differences between the lanthanide ion 4f state and the actinide ion 5f state properties. RP BEITZ, JV (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 70 TC 21 Z9 21 U1 1 U2 13 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 JUN PY 1994 VL 207 BP 41 EP 50 DI 10.1016/0925-8388(94)90173-2 PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500010 ER PT J AU LIU, GK CARNALL, WT JONES, RP CONE, RL HUANG, J AF LIU, GK CARNALL, WT JONES, RP CONE, RL HUANG, J TI ELECTRONIC-ENERGY LEVEL STRUCTURE OF TB3+ IN LIYF4 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV AB We report the experimental results and theoretical modeling for the electronic energy level structure of Tb3+ in laser crystal LiYF4. Using polarized one- and two-photon spectroscopic methods, crystal field levels of the Tb3+ ion have been obtained from the ground multiplet up to 42 000 cm-1 and unambiguously identified. The observed spectra have been analyzed using an effective operator Hamiltonian. Free-ion and crystal field parameters were determined in non-linear least-squares fitting of the calculated energy states to 165 observed levels. Excellent correlation (rms = 9.7 cm-1) was obtained between the experiments and the computed energy level structure. C1 MONTANA STATE UNIV,DEPT PHYS,BOZEMAN,MT 59717. UNIV WISCONSIN EAU CLAIRE,DEPT PHYS & ASTRON,EAU CLAIRE,WI 54702. RP LIU, GK (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 9 TC 13 Z9 13 U1 2 U2 8 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 JUN PY 1994 VL 207 BP 69 EP 73 DI 10.1016/0925-8388(94)90179-1 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500016 ER PT J AU QIAN, C WANG, B EDELSTEIN, N REDDMANN, H HAGEN, C AMBERGER, HD AF QIAN, C WANG, B EDELSTEIN, N REDDMANN, H HAGEN, C AMBERGER, HD TI THE ELECTRONIC-STRUCTURE OF ORGANOMETALLIC COMPLEXES OF THE F-ELEMENTS .36. PARAMETERIZATION OF THE CRYSTAL-FIELD SPLITTING PATTERN OF (CH3OCH2CH2C5H4)3SMIII SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID LN = LA; PR AB The absorption and luminescence spectra of (CH3OCH2CH2C5H4)3Sm(III) (Cp3'Sm) in hydrocarbon glasses and in KBr pellets have been measured at room and low temperatures. The bands were assigned assuming comparable crystal field splitting patterns for Cp3'Sm and for the previously analyzed Cp3Sm(NCCH3)2. The parameters of an empirical Hamiltonian were fitted to the energies of 42 levels to give an rms deviation of 42 cm-1. Making use of the calculated wave functions and eigenvalues, the experimentally determined low temperature magnetic susceptibility of powdered Cp3'Sm could be simulated. C1 UNIV HAMBURG,INST ANORGAN & ANGEW CHEM,MARTIN LUTHER KING PL 6,D-20146 HAMBURG,GERMANY. CHINESE ACAD SCI,SHANGHAI INST ORGAN CHEM,ORGANOMET CHEM LAB,SHANGHAI 200032,PEOPLES R CHINA. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 15 TC 11 Z9 11 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 JUN PY 1994 VL 207 BP 87 EP 89 DI 10.1016/0925-8388(94)90183-X PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500020 ER PT J AU BEITZ, JV HINAUS, BM HUANG, J AF BEITZ, JV HINAUS, BM HUANG, J TI VARIABLE-TEMPERATURE OPTOACOUSTIC STUDIES OF 4F-STATES OF NEODYMIUM IN OXIDE PHASES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID PHOTOACOUSTIC-SPECTROSCOPY; ACTINIDE OXIDES; SPECTRA AB High resolution optoacoustic studies on a wealky absorbing 4f electron manifold of Nd3+ in several samples of Nd2O3 of varying purity are reported using a tunable, pulsed laser as the excitation light source. In cases where nonlinear optoacoustic was observed, good agreement was found between the observed response and a simple nonlinear optical absorption model. To resolve differing spectral assignments for bands of Nd3+ in Nd2O3 observed by conventional and optoacoustic spectroscopy, this work was carried out at sample temperatures ranging from 4 K to 295 K in an apparatus designed for studies on air- or moisture-sensitive materials. C1 UNIV WISCONSIN EAU CLAIRE,DEPT PHYS & ASTRON,EAU CLAIRE,WI 54702. RP BEITZ, JV (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 18 TC 0 Z9 0 U1 0 U2 1 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 JUN PY 1994 VL 207 BP 115 EP 119 DI 10.1016/0925-8388(94)90190-2 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500027 ER PT J AU LOONG, CK SODERHOLM, L AF LOONG, CK SODERHOLM, L TI RARE-EARTH CRYSTAL-FIELD SPECTROSCOPY BY NEUTRON MAGNETIC SCATTERING - FROM XENOTIME TO HIGH-TC SUPERCONDUCTORS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID ELECTRONIC RAMAN-SCATTERING; 2-PHOTON ABSORPTION-LINES; ENERGY-LEVELS; TRIVALENT HOLMIUM; LANTHANIDE IONS; SPLITTINGS; SPECTRA; ERPO4; TMPO4; HOPO4 AB Optical spectroscopy is one of the traditional methods used to determine the overall splitting of the rare earth ion energy states within an f(N) configuration in either solution or solid state of transparent materials. This technique can provide data over a wide energy range with good resolution, and the parameters obtained for the empirical Hamiltonian reflect the ''best fit'' of the observed energies. Absolute intensity measurements of optical transitions and their comparison with theory, however, are difficult. Magnetic scattering of thermal neutrons arises from an interaction of the neutron magnetic moment with the convection and spin current of the scatterer. Such a weak interaction does not involve any excited intermediate states of the system and requires only a first-order perturbation treatment to calculate the scattering cross-section. However, neutron spectroscopy probes only states at energies less than approximately 1 eV. It is demonstrated that a combined treatment of neutron and optical data can provide the complementary information necessary for a proper characterization of the level splittings and wavefunctions of the rare earth ions in xenotime (RPO4, R = Tb to Yb). Next we discuss the analyses of neutron scattering data for the understanding of the rare earth energy levels and wavefunctions in various high T(c) copper oxide superconductors and related compounds. The importance of a consistent refinement of the crystal field parameters across a series of isostructural rare earth compounds and a systematic comparison of the low temperature magnetic properties with model calculations are emphasized. RP LOONG, CK (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 69 TC 9 Z9 9 U1 0 U2 5 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 JUN PY 1994 VL 207 BP 153 EP 160 DI 10.1016/0925-8388(94)90196-1 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500033 ER PT J AU XUE, JS ANTONIO, MR WHITE, WT SODERHOLM, L KAUZLARICH, SM AF XUE, JS ANTONIO, MR WHITE, WT SODERHOLM, L KAUZLARICH, SM TI THE ELECTRONIC-PROPERTIES OF CE IN CEFE4P12 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID SUPERCONDUCTING LAFE4P12 AB An investigation of the bonding behaviours of selected rare earth (R) containing filled skutterudite samples (RFe4P12) is reported. X-ray diffraction and magnetic properties of CeFe4P12 are compared with those previously published. The electronic structure and bonding properties of the R=La, Ce and Pr members of this series are probed by X-ray absorption near-edge spectroscopy (XANES), and compared with the L3 edges of selected trivalent and tetravalent standards. We find.that the Ce XANES is complex, indicating that although the Ce is primarily trivalent, there is evidence of complex electronic behaviour in CeFe4P12. A comparison of the L3 edges of LaFe4P12, and PrFe4P12, as well as CeFe4P12, with those obtained from ionic model compounds reveals some bonding between the f-ion and the -FeP- framework in all cases. C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. RP XUE, JS (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 14 TC 20 Z9 20 U1 0 U2 5 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 JUN PY 1994 VL 207 BP 161 EP 164 DI 10.1016/0925-8388(94)90197-X PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500034 ER PT J AU LOONG, CK SODERHOLM, L XUE, JS ABRAHAM, MM BOATNER, LA AF LOONG, CK SODERHOLM, L XUE, JS ABRAHAM, MM BOATNER, LA TI RARE-EARTH ENERGY-LEVELS AND MAGNETIC-PROPERTIES OF DYPO4 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID DYSPROSIUM PHOSPHATE DYPO4; ISING ANTIFERROMAGNET; RELAXATION AB The dynamic and static paramagnetic response of DyPO4 has been studied by neutron inelastic scattering and single-crystal magnetic susceptibility measurements. The observed energies and intensities of the magnetic transitions at 15 and 100 K were used to refine the parameters of the crystal field potential for Dy3+ ions in DyPO4. The derived crystal field level structure provides a basis for explaining the low temperature magnetic properties of this compound. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP LOONG, CK (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 35 TC 14 Z9 14 U1 1 U2 5 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 JUN PY 1994 VL 207 BP 165 EP 169 DI 10.1016/0925-8388(94)90198-8 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500035 ER PT J AU ELLISON, AJG LOONG, CK WAGNER, J AF ELLISON, AJG LOONG, CK WAGNER, J TI NEUTRON-SCATTERING STUDIES OF YB-BEARING SILICATE-GLASSES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID COORDINATION ENVIRONMENTS AB The static and dynamic magnetic response of the Yb3+ ions in 3Na2O.Yb2O3.6SiO2 glass and the isochemical crystalline silicate Na3YbSi3O9 has been studied by neutron diffraction, inelastic magnetic scattering, and magnetic susceptibility measurements. The rare earth sites in the glass have an average coordination number of 5.6 +/- 0.5 and give a mean rare earth-oxygen bond length of 2.23 angstrom; average Si-O and O-O coordination numbers and bond distances are comparable to those in vitreous SiO2. The magnetic excitation spectrum of the Na3YbSi3O9 material was analyzed by a crystal field model using a method of descending symmetry. The magnetic susceptibility and the excitation spectrum of the Yb glasses can be described by a distribution of ligand field effects on the Yb3+ ions that are similar to the nominal crystal field in crystalline Na3YbSi3O9. RP ELLISON, AJG (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 7 TC 3 Z9 3 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 JUN PY 1994 VL 207 BP 170 EP 173 DI 10.1016/0925-8388(94)90199-6 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500036 ER PT J AU LOONG, CK RICHARDSON, JW OZAWA, M KIMURA, M AF LOONG, CK RICHARDSON, JW OZAWA, M KIMURA, M TI CRYSTAL-STRUCTURE AND SHORT-RANGE OXYGEN DEFECTS IN LA-MODIFIED AND ND-MODIFIED ZRO2 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID X-RAY-DIFFRACTION; ZR(CA,Y)O2-X AB The crystal structure of rare earth modified zirconia and the associated oxygen defects were studied by neutron diffraction. A Rietveld analysis of the neutron powder patterns of heat-treated samples of La- and Nd-10 mol% ZrO2 revealed the composition of a major tetragonal phase (space group P4(2)/nmc) and a minor cubic phase (space group Fm3m). The short-range oxygen defects structure was examined by a Fourier filtering technique. A real-space correlation function, obtained from a Fourier transform of the filtered residual diffuse scattering, showed evidence of static, oxygen vacancy-induced atomic displacements along the [111] and other directions of the pseudocubic cell. C1 NAGOYA INST TECHNOL,TAJIMI,GIFU 507,JAPAN. TOYOTA CENT RES & DEV LABS INC,NAGAKUTE,AICHI 48011,JAPAN. RP LOONG, CK (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 13 TC 8 Z9 9 U1 0 U2 3 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 JUN PY 1994 VL 207 BP 174 EP 177 DI 10.1016/0925-8388(94)90200-3 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500037 ER PT J AU JOHNSTON, DC BORSA, F CHO, JH CHOU, FC TORGESON, DR VAKNIN, D ZARESTKY, JL ZIOLO, J JORGENSEN, JD RADAELLI, PG SCHULTZ, AJ WAGNER, JL CHEONG, SW AF JOHNSTON, DC BORSA, F CHO, JH CHOU, FC TORGESON, DR VAKNIN, D ZARESTKY, JL ZIOLO, J JORGENSEN, JD RADAELLI, PG SCHULTZ, AJ WAGNER, JL CHEONG, SW TI PHASE-DIAGRAM AND PHASE-SEPARATION IN LA2-XSRXCUO4+DELTA SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID ELECTROCHEMICALLY OXIDIZED LA2CUO4+DELTA; SUPERCONDUCTING LA2CUO4+DELTA; MAGNETIC-PROPERTIES; OXIDATION; CRYSTAL; SUSCEPTIBILITY; LA2CUO4.032; DIFFRACTION; TRANSPORT; NEUTRON AB The phase diagram of the title system is remarkably rich, exhibiting regions of long-range antiferromagnetic order, short-range (spin-glass-like) order, high temperature superconductivity, or none of these. Here, the phase diagram is reviewed, with an emphasis on our recent studies using La-139 NQR, powder and single crystal neutron diffraction, and magnetization measurements for 0 less-than-or-equal-to x less-than-or-equal-to 0.15 and 0 less-than-or-equal-to delta less than or similar 0.1. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. AT&T BELL LABS,MURRAY HILL,NJ 07974. ARGONNE NATL LAB,ARGONNE,IL 60439. RP JOHNSTON, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Radaelli, Paolo/C-2952-2011; Vaknin, David/B-3302-2009 OI Radaelli, Paolo/0000-0002-6717-035X; Vaknin, David/0000-0002-0899-9248 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD JUN PY 1994 VL 207 BP 206 EP 212 DI 10.1016/0925-8388(94)90207-0 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500044 ER PT J AU MALIK, SK TAKEYA, H GSCHNEIDNER, KA AF MALIK, SK TAKEYA, H GSCHNEIDNER, KA TI THE LOW-TEMPERATURE BEHAVIOR OF SOME LIGHT LANTHANIDE RRHSB AND RPDSB COMPOUNDS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID SYSTEM; HEAT AB The low temperature heat capacity and magnetic susceptibilities of LaRhSb, LaPdSb, PrRhSb and PrPdSb have been examined. LaRhSb is a superconductor with a T(c) of 2.1 K, while LaPdSb is normal down to 0.6 K. Both Pr compounds order magnetically. PrRhSb at 6 and 18 K. and PrPdSb at 10 K. The upper ordering temperature of PrRhSb is probably antiferromagnetic and the lower one may correspond to a spin glass state. Both Pr compounds have unusually large electronic specific heat constant values of 35 and 75 mJ mol-1 K-2 for PrRhSb and PrPdSb, respectively. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. NR 14 TC 7 Z9 7 U1 0 U2 1 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 JUN PY 1994 VL 207 BP 237 EP 240 DI 10.1016/0925-8388(94)90211-9 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500048 ER PT J AU ELLIS, TW AF ELLIS, TW TI METAL-MATRIX COMPOSITES PRODUCED FROM YTTRIUM BASED OR HIGH YTTRIUM CONTENT ALLOYS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV AB This paper surveys the author's production of metal matrix composite from yttrium or high yttrium content alloys. Composite materials have been produced by directional solidification and/or cooling in the yttrium-oxygen system. Additionally, metal-metal matrix composites were produced by deformation processing. These materials have been produced in the yttrium-titanium system and in the yttrium-niobium system are analogous to those formed in copper-niobium alloys. Here a precursor alloy is cold worked such that both phases co-deform. This produces a fine filamentary reinforcing phase within a continuous matrix phase. Both methods produce materials with interesting microstructures and possible new methods for the production of structural materials from yttrium, scandium or the other rare earth metals. RP ELLIS, TW (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 6 TC 0 Z9 0 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 JUN PY 1994 VL 207 BP 362 EP 365 DI 10.1016/0925-8388(94)90240-2 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500077 ER PT J AU GRAMSCH, SA MORSS, LR AF GRAMSCH, SA MORSS, LR TI SYNTHESIS AND CHARACTERIZATION OF CHARGE-SUBSTITUTED GARNETS YCALNGA5O12 (LN=CE, PR, TB) SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID PYROCHLORES; COMBUSTION; LI8CEO6 AB A low temperature method is described for the preparation of the new garnet compounds YCaLnGa5O12 (Ln = Ce, Pr, Tb. In this set of compounds (Ca2+ + Ln4+) replaces 2Y3+ in the parent gallium based garnet Y3Ga5O12 in order to stabilize as effectively as possible the Ln4+ species in the eight-coordinate ''A'' site of the garnet structure. Characterization of the oxides by X-ray powder diffraction and thermogravimetric analysis is discussed with regard to the structural relationship of the substituted compound to the parent material. The tetravalent ions Pr4+ and Tb4+ exhibit increased thermal stability in reducing conditions as compared to the Ln4+ states in the fluorite (LnO2) and perovskite (BaLnO3) type structures. This result is discussed with reference to the complex crystal chemistry of these systems. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP GRAMSCH, SA (reprint author), UNIV CHICAGO,DEPT CHEM,5735 S ELLIS AVE,CHICAGO,IL 60637, USA. RI Gramsch, Stephen /K-1460-2015 OI Gramsch, Stephen /0000-0003-1031-1155 NR 21 TC 6 Z9 6 U1 0 U2 2 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 JUN PY 1994 VL 207 BP 432 EP 435 DI 10.1016/0925-8388(94)90257-7 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500094 ER PT J AU ANTONIO, MR XUE, JS SODERHOLM, L AF ANTONIO, MR XUE, JS SODERHOLM, L TI THE OXIDATION-STATE OF CERIUM IN CE2MOO6 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 20th Rare Earth Research Conference CY SEP 12-17, 1993 CL MONTEREY, CA SP RARE EARTH RES CONF INC, SAN JOSE STATE UNIV ID MOLYBDENUM COMPOUNDS; ABSORPTION-EDGE; SPECTROSCOPY AB Synchrotron radiation was used to determine the oxidation state of cerium in Ce2MoO6 through Ce L-edge X-ray absorption fine structure (XAFS). The results from this direct spectroscopic investigation reveal that, to the level of sensitivity of the technique, cerium is trivalent in Ce2MoO6. Magnetic susceptibility data over the temperature range 10-300 K do not follow the Curie Law and, therefore, cannot be used to support any assignment of valence. The possible origins of the unique structure and colour of the RE = Ce analogue of the RE2MoO6 series are discussed. RP ANTONIO, MR (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 22 TC 9 Z9 9 U1 0 U2 5 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 JUN PY 1994 VL 207 BP 444 EP 448 DI 10.1016/0925-8388(94)90260-7 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500097 ER PT J AU RICHARDSON, FS MORSS, LR AF RICHARDSON, FS MORSS, LR TI PROCEEDINGS OF THE 20TH RARE-EARTH RESEARCH CONFERENCE, MONTEREY, CALIFORNIA, SEPTEMBER 12-17, 1993 - PREFACE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Editorial Material C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP RICHARDSON, FS (reprint author), UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903, USA. NR 0 TC 0 Z9 0 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 JUN PY 1994 VL 207 BP R13 EP R13 DI 10.1016/0925-8388(94)90165-1 PG 1 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NU815 UT WOS:A1994NU81500002 ER PT J AU LEE, K WEITSMAN, Y AF LEE, K WEITSMAN, Y TI OPTIMAL COOL-DOWN IN NONLINEAR THERMOVISCOELASTICITY WITH APPLICATION TO GRAPHITE PEEK (APC-2) LAMINATES SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME LA English DT Article ID AROMATIC POLYMER COMPOSITES; CRYSTALLINE MORPHOLOGY; MATRIX AB Many thermoplastic resin composite laminates, such as those made of APC-2, undergo a substantial temperature drop during their post-manufacturing cool down. This thermal excursion induces significant residual thermal stresses into the laminate due to the mutual geometric constraints among the multidirectional plies. In view of the considerable time-dependent relaxation which occurs during the cooling process, the residual thermal stresses exhibit strong dependence on the temperature history. However, in view of the high magnitudes of those stresses, the relaxation behavior is viscoelastically nonlinear. This paper demonstrates that it is possible to obtain an optimal cool-down path which minimizes the residual thermal stresses in APC-2 composites upon the termination of the cooling process. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP LEE, K (reprint author), UNIV TENNESSEE,DEPT ENGN SCI & MECH,KNOXVILLE,TN 37996, USA. NR 13 TC 11 Z9 11 U1 0 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0021-8936 J9 J APPL MECH-T ASME JI J. Appl. Mech.-Trans. ASME PD JUN PY 1994 VL 61 IS 2 BP 367 EP 374 DI 10.1115/1.2901453 PG 8 WC Mechanics SC Mechanics GA NU630 UT WOS:A1994NU63000020 ER PT J AU CHRISTENSEN, RM AF CHRISTENSEN, RM TI MATERIAL INSTABILITY FOR FIBER COMPOSITES SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME LA English DT Note RP CHRISTENSEN, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,DEPT CHEM & MAT SCI,POB 808,LIVERMORE,CA 94550, USA. NR 7 TC 7 Z9 7 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0021-8936 J9 J APPL MECH-T ASME JI J. Appl. Mech.-Trans. ASME PD JUN PY 1994 VL 61 IS 2 BP 476 EP 477 DI 10.1115/1.2901472 PG 2 WC Mechanics SC Mechanics GA NU630 UT WOS:A1994NU63000039 ER PT J AU NIWANO, M SIMONS, JK FRIGO, SP ROSENBERG, RA AF NIWANO, M SIMONS, JK FRIGO, SP ROSENBERG, RA TI SYNCHROTRON-RADIATION-INDUCED REACTIONS OF TETRAETHOXYSILANE ON SI STUDIED BY PHOTOEMISSION SPECTROSCOPY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; SIO2/SI INTERFACE; SURFACE; FILM; TEMPERATURE; SILICON; SI(111); SI(100); OXYGEN; BORON AB The synchrotron-radiation (SR)-induced chemical reactions of tetraethoxysilane Si(OC2H5)4 (TEOS) adsorbed on Si has been studied using photoemission spectroscopy. It is demonstrated that TEOS adsorbs intact on the Si surface below room temperature. SR in the vacuum ultraviolet region decomposes the TEOS molecules adsorbed on Si to form a silicon-oxide-like film on the Si surface, but some carbon remains in the film. Results of irradiation experiments on condensed layers of TEOS and water adsorbed on Si at 85 K indicate that the presence of water reduces the carbon contamination. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP NIWANO, M (reprint author), TOHOKU UNIV,ELECT COMMUN RES INST,SENDAI,MIYAGI 980,JAPAN. RI Rosenberg, Richard/K-3442-2012 NR 32 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1994 VL 75 IS 11 BP 7304 EP 7309 DI 10.1063/1.356640 PG 6 WC Physics, Applied SC Physics GA NQ267 UT WOS:A1994NQ26700019 ER PT J AU ZERKLE, DK SAPPEY, AD AF ZERKLE, DK SAPPEY, AD TI LIMITATIONS IN THE APPLICATION OF HOOK SPECTROSCOPY FOR DENSITY-MEASUREMENT IN HIGH-DENSITY-GRADIENT MEDIA SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID LASER AB Hook spectroscopy has been successfully implemented to measure ground-state Cu atom density in laser-ablated copper vapor plumes in a background gas. In 1-25 Torr of background gas, the technique has been used to measure Cu atom densities up to 4 X 10(15) cm-3. With higher background gas pressures, increasing distortion of the hook spectra is observed until they are rendered nearly uninterpretable at background gas pressures as low as 100 Torr. This effect is attributed to wavelength-dependent beam deflection caused by large gradients in copper atom density present at high background gas pressures. RP ZERKLE, DK (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 5 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1994 VL 75 IS 11 BP 7576 EP 7578 DI 10.1063/1.356587 PG 3 WC Physics, Applied SC Physics GA NQ267 UT WOS:A1994NQ26700067 ER PT J AU WOS, L AF WOS, L TI THE PROBLEM OF HYPERPARAMODULATION AND NUCLEI SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE AUTOMATED REASONING; HYPERPARAMODULATION; HYPERRESOLUTION; NUCLEI; UNSOLVED RESEARCH PROBLEM AB This article is the thirty-third of a series of articles discussing various open research problems in automated reasoning. The problem for research asks one to establish criteria for allowing certain - but not all - new clauses to become nuclei when using the inference rule hyperparamodulation or hyperresolution. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 3 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-7433 J9 J AUTOM REASONING JI J. Autom. Reasoning PD JUN PY 1994 VL 12 IS 3 BP 407 EP 409 DI 10.1007/BF00885768 PG 3 WC Computer Science, Artificial Intelligence SC Computer Science GA PX869 UT WOS:A1994PX86900006 ER PT J AU HUNTER, CN HUNDLE, BS HEARST, JE LANG, HP GARDINER, AT TAKAICHI, S COGDELL, RJ AF HUNTER, CN HUNDLE, BS HEARST, JE LANG, HP GARDINER, AT TAKAICHI, S COGDELL, RJ TI INTRODUCTION OF NEW CAROTENOIDS INTO THE BACTERIAL PHOTOSYNTHETIC APPARATUS BY COMBINING THE CAROTENOID BIOSYNTHETIC PATHWAYS OF ERWINIA-HERBICOLA AND RHODOBACTER-SPHAEROIDES SO JOURNAL OF BACTERIOLOGY LA English DT Article ID GENE-CLUSTER; RHODOPSEUDOMONAS-SPHAEROIDES; ESCHERICHIA-COLI; REACTION CENTERS; COMPLEXES; CAPSULATA; PRODUCTS; MUTANTS; LH1 AB Carotenoids have two major functions in bacterial photosynthesis, photoprotection and accessory light harvesting. The genes encoding many carotenoid biosynthetic pathways have now been mapped and cloned in several different species, and the availability of cloned genes which encode the biosynthesis of carotenoids not found in the photosynthetic genus Rhodobacter opens up the possibility of introducing a wider range of foreign carotenoids into the bacterial photosynthetic apparatus than would normally be available by producing mutants of the native biosynthetic pathway. For example, the crt genes from Erwinia herbicola, a gram-negative nonphotosynthetic bacterium which produces carotenoids in the sequence of phytoene, lycopene, beta-carotene, beta-cryptoxanthin, zeaxanthin, and zeaxanthin glucosides, are clustered within a 12.8-kb region and have been mapped and partially sequenced. In this paper, part of the E. herbicola crt cluster has been excised and expressed in various crt strains of Rhodobacter sphaeroides. This has produced light-harvesting complexes with a novel carotenoid composition, in which the foreign carotenoids such as p-carotene function successfully in light harvesting. The outcome of the combination of the crt genes in R. sphaeroides with those from E. herbicola has, in some cases, resulted in an interesting rerouting of the expected biosynthetic sequence, which has also provided insights into how the various enzymes of the carotenoid biosynthetic pathway might interact. Clearly this approach has considerable potential for studies on the control and organization of carotenoid biosynthesis, as well as providing novel pigment-protein complexes for functional studies. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. UNIV GLASGOW,DEPT BOT,GLASGOW G12 8QQ,LANARK,SCOTLAND. UNIV SHEFFIELD,DEPT MOLEC BIOL,SHEFFIELD S10 2TN,S YORKSHIRE,ENGLAND. NIPPON MED COLL,BIOL LABS,NAKAHARA KU,KAWASAKI,KANAGAWA 211,JAPAN. NR 30 TC 43 Z9 48 U1 0 U2 6 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD JUN PY 1994 VL 176 IS 12 BP 3692 EP 3697 PG 6 WC Microbiology SC Microbiology GA NQ764 UT WOS:A1994NQ76400029 PM 8206847 ER PT J AU TUNG, CS SOUMPASIS, DM HUMMER, G AF TUNG, CS SOUMPASIS, DM HUMMER, G TI AN EXTENSION OF THE RIGOROUS BASE-UNIT ORIENTED DESCRIPTION OF NUCLEIC-ACID STRUCTURES SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID CRYSTAL-STRUCTURE; B-DNA; MODEL AB Our proposed description for DNA base/base-pair structures (1), though rigorous, does not satisfy some of the requirements as established at the Cambridge Workshop (2). Here, we propose a revised description for base/base-unit structures of nucleic acids. This new description is as rigorous and satisfies all the requirements (2). Following the original approach, the moment-of-inertia frame is still the choice of the internal coordinate system for a base/base-unit. The revised description has the minimum number of parameters (i.e., six parameters per rigid body) in the set. Besides regular Watson-Crick type of helices (e.g., A-DNA, A-RNA, B-DNA, Z-DNA, etc.), the revised description also works for non-Watson-Crick, multiple stranded molecules (e.g., triplex, quadruplex, etc.) as well as parallel stranded molecules. C1 MAX PLANCK INST BIOPHYS CHEM, DEPT MOLEC BIOL, D-37018 GOTTINGEN, GERMANY. RP TUNG, CS (reprint author), LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RI Hummer, Gerhard/A-2546-2013 OI Hummer, Gerhard/0000-0001-7768-746X NR 19 TC 20 Z9 21 U1 1 U2 3 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD JUN PY 1994 VL 11 IS 6 BP 1327 EP 1344 PG 18 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PC517 UT WOS:A1994PC51700011 PM 7946077 ER PT J AU BHATIA, S ENGELKE, F PRUSKI, M GERSTEIN, BC KING, TS AF BHATIA, S ENGELKE, F PRUSKI, M GERSTEIN, BC KING, TS TI INTERACTION OF HYDROGEN WITH SUPPORTED RU CATALYSTS - HIGH-PRESSURE IN-SITU NMR-STUDIES SO JOURNAL OF CATALYSIS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; SURFACE-DIFFUSION; CHEMISORBED HYDROGEN; ELECTRON REFLECTION; H-2 CHEMISORPTION; SUBSURFACE SITES; CRYSTAL-SURFACES; ADSORPTION; RU(001); PLATINUM AB An in situ H-1 nuclear magnetic resonance (NMR) technique has been employed to study the interaction of hydrogen with silica-supported ruthenium catalysts in the temperature range 300-473 K and at pressures of 10(-5)-760 Torr. In addition to an upfield NMR peak (called a) occurring at approximately -60 ppm and observed at low pressures (P < 100 Torr), we have noted the emergence of a second peak (called beta) occurring at approximately -30 ppm at elevated pressures (P > 100 Torr). These two hydrogen populations represent adsorbed hydrogen interacting with Ru metal particles, as indicated by the observed Knight shifts. The a hydrogen species exists in the form of less mobile hydrogen species al, or a mobile hydrogen species am with heats of adsorption determined by microcalorimetry to be about 70 kJ/mol and 40 kJ/mol, respectively. The heat of adsorption of the beta species was determined to be approximately 10 kJ/mol. Hydrogen adsorption isotherms were obtained from the NMR peak intensities calibrated by a gadolinium-doped lanthanum hydride internal reference. A higher dispersion of metal particles correlated with a larger amount of the weakly adsorbed beta hydrogen species. The H/Ru(surface) ratio was observed to be in excess of 5 at elevated pressures (> 500 Torr). The high H/Ru(surface) was due to the adsorption of large amounts of beta hydrogen. (C) 1994 Academic Press, Inc C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP BHATIA, S (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011, USA. NR 52 TC 34 Z9 34 U1 1 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD JUN PY 1994 VL 147 IS 2 BP 455 EP 464 DI 10.1006/jcat.1994.1162 PG 10 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA NL655 UT WOS:A1994NL65500007 ER PT J AU JERNIGAN, GG SOMORJAI, GA AF JERNIGAN, GG SOMORJAI, GA TI CARBON-MONOXIDE OXIDATION OVER 3 DIFFERENT OXIDATION-STATES OF COPPER - METALLIC COPPER, COPPER (I) OXIDE, AND COPPER (II) OXIDE - A SURFACE SCIENCE AND KINETIC-STUDY SO JOURNAL OF CATALYSIS LA English DT Article ID GAS SHIFT REACTION; CO OXIDATION; METHANOL SYNTHESIS; SUBSURFACE OXYGEN; CATALYSTS; MECHANISM; ADSORPTION; CU(111); XPS; REDUCTION AB Reaction rates and activation energies were measured for carbon monoxide oxidation over thin films of metallic copper, copper (I) oxide, and copper (II) oxide grown on graphite. The reactions were carried out in the temperature range 200-350-degrees-C at total pressures of 100 Torr. Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) were used to characterize the growth and oxidation states of the copper films before and after catalytic reactions. The stability of a given oxidation state of copper under reaction conditions was found to be a function of the oxidizing power of the CO/02 partial pressure ratio: metallic copper, Cu2O, and CuO were stable at 97/3, 90/10, and 66/33 ratios, respectively. The rate of reaction at 300-degrees-C decreased with increasing copper oxidation state (Cu > Cu2O > CuO) and the activation energy increased with increasing copper oxidation state (Cu 9 < Cu2O 14 < CuO 17 kcal/mol). The kinetic parameters for CO oxidation over platinum foil was tested at a 66/33 CO/02 ratio for comparison. The reaction rate over platinum was approximately equal to that over metallic copper at 300-degrees-C and had a larger activation energy (20 kcal/mol) than CuO. The possible mechanisms for CO oxidation over the different oxidation states of copper are discussed. (C) 1994 Academic Press, Inc. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP JERNIGAN, GG (reprint author), LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720, USA. NR 30 TC 217 Z9 220 U1 9 U2 110 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD JUN PY 1994 VL 147 IS 2 BP 567 EP 577 DI 10.1006/jcat.1994.1173 PG 11 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA NL655 UT WOS:A1994NL65500018 ER PT J AU MA, Z LIU, K HARDING, LB KOMOTOS, M SCHATZ, GC AF MA, Z LIU, K HARDING, LB KOMOTOS, M SCHATZ, GC TI DIFFERENTIAL CROSS-SECTIONS FOR FINE-STRUCTURE TRANSITIONS IN O(P-3(2))+AR COLLISIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CORRELATED MOLECULAR CALCULATIONS; GAUSSIAN-BASIS SETS; OPEN-SHELL SYSTEMS; SCATTERING; EXCITATION; HE; ENERGY; STATES; H-2 AB We present experimental and theoretical differential cross sections for the fine structure changing process Ar + O((3)p(2))->Ar + O(P-3(jmj)) with (j,m(j))=(1,1), (1,0), and (0,0). rue measured cross sections refer to a collision energy of 3.2 kcal/mol, and were obtained from Doppler line shapes associated with (2+1) resonance-enhanced multiphoton ionization of O(P-3(jmj)) after scattering in a crossed-beam apparatus. The theoretical results are based on (3) Sigma(-) and (II)-I-3 potential curves obtained from high quality ab initio calculations, and on quantum coupled-channel calculations. The calculated differential cross sections show strong Stuckelberg oscillations, with similar magnitudes and phases for all three final states. With slight adjustment (0.03 Angstrom) of the hard wall on the (3) Sigma(-) curve, the calculated angular distributions match up well with the corresponding experimental results, much better than is found using previously derived empirical potentials. At the same time, the integral total cross sections obtained from the ab initio measurements are in satisfactory agreement with previous measurements. C1 NORTHWESTERN UNIV, DEPT CHEM, EVANSTON, IL 60208 USA. RP MA, Z (reprint author), ARGONNE NATL LAB, DIV CHEM, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Liu, Kopin/F-7929-2012 NR 27 TC 33 Z9 33 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1994 VL 100 IS 11 BP 8026 EP 8039 DI 10.1063/1.466796 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NN731 UT WOS:A1994NN73100017 ER PT J AU HSU, CW BALDWIN, DP LIAO, CL NG, CY AF HSU, CW BALDWIN, DP LIAO, CL NG, CY TI ROTATIONALLY RESOLVED NONRESONANT 2-PHOTON IONIZATION OF SH SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ENERGY PHOTOELECTRON-SPECTROSCOPY; VACUUM ULTRAVIOLET PHOTODISSOCIATION; ENHANCED MULTIPHOTON IONIZATION; 193 NM PHOTODISSOCIATION; THRESHOLD PHOTOIONIZATION; NITRIC-OXIDE; 2-PHOTON IONIZATION; GROUND-STATE; RESOLUTION; NO AB The threshold photoelectron (PE) spectrum for nascent SH formed in the ultraviolet photodissociation of H2S has been measured using the nonresonant two-photon pulsed field ionization (N2P-PFI) technique. The rotationally resolved N2P-PFI-PE spectrum of SH indicates that photoionization dynamics favor the rotational angular momentum change Delta N less than or equal to 0 with the Delta N, values up to -3, an observation similar to that found in the PFI-PE spectra of OH (OD) and NO. The ionization energy for SH(X (II3/2)-I-2) is determined to be 84 057.5 +/- 3 cm(-1) (10.4219 +/- 0.0004 eV). The spin-orbit splitting for SH(X 2II(3/2,1/2)) is 377 +/- 2 cm(-1), in agreement with the literature value. This study illustrates that the PFI-PE detection method can be a sensitive probe for the nascent internal energy distribution of photoproducts. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP HSU, CW (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 54 TC 33 Z9 34 U1 1 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 JUN 1 PY 1994 VL 100 IS 11 BP 8047 EP 8054 DI 10.1063/1.466798 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NN731 UT WOS:A1994NN73100019 ER PT J AU LIM, KH FERER, M SMITH, DH AF LIM, KH FERER, M SMITH, DH TI CRITICAL-SCALING THEORY OF BINARY EXCESS-ENTHALPIES AND ITS USE TO DETERMINE LIQUID-LIQUID EQUILIBRIUM PHASE COMPOSITIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COEXISTENCE CURVE; CRITICAL-POINTS; MIXTURES; WATER; 2-BUTOXYETHANOL; PREDICTION; SYSTEMS AB From the Widom-Kadanoff scaling theory, predictions are made for the temperature and composition dependence of excess enthalpies for binary mixtures. The predictions are tested with one- and two-phase heats of mixing (or excess enthalpies) measured by flow calorimetry for the system C4H9OC2H4OH/H2O over the entire composition range and at temperatures from the lower consolute temperature (T-c) to about 20 degrees C above T-c. Compositions of conjugate phases at each temperature are obtained by solving for points of intersection between fits of the scaling equations to single-phase data and fits of equations for straight lines to two-phase data. The compositions thus obtained are in excellent agreement with literature data. For all but the very highest amphiphile concentrations, the agreement of theory with the data is excellent when a ''new'' order parameter is used. C1 US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507. CHUNG ANG UNIV,DEPT CHEM ENGN,SEOUL 156756,SOUTH KOREA. W VIRGINIA UNIV,DEPT PHYS,MORGANTOWN,WV 26506. UNIV OKLAHOMA,INST APPL SURFACTANT RES,NORMAN,OK 73019. UNIV OKLAHOMA,SCH CHEM ENGN & MAT SCI,NORMAN,OK 73019. RP LIM, KH (reprint author), W VIRGINIA UNIV,DEPT CHEM ENGN,MORGANTOWN,WV 26506, USA. NR 34 TC 3 Z9 3 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1994 VL 100 IS 11 BP 8284 EP 8292 DI 10.1063/1.466773 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NN731 UT WOS:A1994NN73100047 ER EF