FN Thomson Reuters Web of Science™ VR 1.0 PT J AU PALLER, MH AF PALLER, MH TI RELATIONSHIPS BETWEEN FISH ASSEMBLAGE STRUCTURE AND STREAM ORDER IN SOUTH-CAROLINA COASTAL-PLAIN STREAMS SO TRANSACTIONS OF THE AMERICAN FISHERIES SOCIETY LA English DT Article ID ZONATION; PATTERNS AB Forty-seven sample sites were electrofished in 22 streams on the South Carolina coastal plain. Average species numbers adjusted to a constant stream surface area were 12.7, 17.5, 21.4, and 22.0 in first- through fourth-order streams, respectively. Species addition and replacement led to large changes in species composition among stream orders. Relatively small fishes, most of which were generalized insectivores, numerically dominated headwater (first- and second-order) streams. Relatively large fishes, many of which were piscivores or benthic insectivores, were most common in fourth-order streams. Headwater species richness was higher and longitudinal species replacement was greater than often observed in other geographic regions of the United States. A comparative assessment of long-term temperature and precipitation records suggested that high species richness at headwater sites was related to mild climate and lack of steep elevation gradients. The presence of numerous small headwater species created the potential for multiple species replacements as downstream increases in habitat volume permitted the establishment of larger fish with predatory and competitive advantages. Because they support many species uncommon in larger streams, headwater streams in the southeastern coastal plain contribute importantly to biodiversity. RP PALLER, MH (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,ENVIRONM SCI SECT,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 31 TC 69 Z9 74 U1 1 U2 15 PU AMER FISHERIES SOC PI BETHESDA PA 5410 GROSVENOR LANE SUITE 110, BETHESDA, MD 20814-2199 SN 0002-8487 J9 T AM FISH SOC JI Trans. Am. Fish. Soc. PD MAR PY 1994 VL 123 IS 2 BP 150 EP 161 DI 10.1577/1548-8659(1994)123<0150:RBFASA>2.3.CO;2 PG 12 WC Fisheries SC Fisheries GA NA850 UT WOS:A1994NA85000003 ER PT J AU DEHAAN, CE KRAFT, SL GAVIN, PR WENDLING, LR GRIEBENOW, ML AF DEHAAN, CE KRAFT, SL GAVIN, PR WENDLING, LR GRIEBENOW, ML TI NORMAL VARIATION IN SIZE OF THE LATERAL VENTRICLES OF THE LABRADOR RETRIEVER DOG AS ASSESSED BY MAGNETIC-RESONANCE-IMAGING SO VETERINARY RADIOLOGY & ULTRASOUND LA English DT Article DE CANINE BRAIN ANATOMY; VENTRICLES; VENTRICULAR SYSTEM; MAGNETIC RESONANCE IMAGING ID UNILATERAL HYDROCEPHALUS; FORAMEN; MONRO; BRAIN AB Detecting canine brain lesions on computed tomography (CT) or magnetic resonance (MR) scans can be difficult if the lesions do not enhance well following administration of intravenous contrast material. Changes in the shape and position of the ventricular system can be important in the diagnosis of such lesions. Normal variation within the canine ventricular system has not been documented. MR scans from 62 normal Labrador retriever type dogs were evaluated. Five dogs had symmetric enlargement of the ventricles, while nineteen dogs had mild to severe ventricular asymmetry. The incidence of asymmetry in normal dogs must be considered when using ventricular configuration as an indication of central nervous system abnormality. C1 WASHINGTON STATE UNIV,DEPT VET CLIN MED & SURG,PULLMAN,WA 99164. SACRED HEART MED CTR & NW IMAGING,DEPT RADIOL,SPOKANE,WA. KANSAS STATE UNIV AGR & APPL SCI,DEPT CLIN SCI,MANHATTAN,KS 66506. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83401. NR 11 TC 30 Z9 30 U1 2 U2 3 PU AMER COLL VETERINARY RADIOLOGY PI RALEIGH PA 2520 BEECHRIDGE RD, RALEIGH, NC 27608 SN 1058-8183 J9 VET RADIOL ULTRASOUN JI Vet. Radiol. Ultrasound PD MAR-APR PY 1994 VL 35 IS 2 BP 83 EP 86 PG 4 WC Veterinary Sciences SC Veterinary Sciences GA NC669 UT WOS:A1994NC66900002 ER PT J AU EARY, LE JENNE, EA VAIL, LW AF EARY, LE JENNE, EA VAIL, LW TI SIMULATING ACIDIFICATION AND RECOVERY PROCESSES IN EXPERIMENTAL CATCHMENTS WITH THE ILWAS MODEL SO WATER AIR AND SOIL POLLUTION LA English DT Article ID ACID DEPOSITION; WATERSHED ACIDIFICATION; STREAMWATER CHEMISTRY; SULFATE ADSORPTION; SURFACE WATERS; ORGANIC-CARBON; NATURAL-WATERS; FOREST SOIL; NORWAY; LAKES AB The Integrated Lake Watershed Acidification Study (ILWAS) model was used to simulate soil discharge chemistry at two neighboring experimental catchments. One catchment underwent deacidification because of the artificial application of deacidified precipitation whereas the other catchment received unaltered acidic precipitation. Simulated results reproduce the observed seasonal dynamics in the concentrations of base cations, NO3-, Al, and H4SiO40 in soil discharges for both catchments. Simulated results also indicate that the export flux of base cations was decreased by 30% at the deacidification catchment in response to the decrease in acid deposition. However, simulated SO42-concentrations show decreases that are about 40% more rapid than were observed. Simulated organic acid concentrations were also substantially lower than those observed at the deacidification catchment, indicating that organic matter decomposition processes were not correctly simulated. Acid-base budgets for both 5 and 50-yr simulations indicate that acid displacement by base cations through ion exchange is the principal process delaying recovery of runoff alkalinity, whereas SO42- desorption has a minor role. Silicate weathering is the dominant acid-consuming process at both catchments. Criteria proposed here for assessing forecast reliability include reproducing seasonal dynamics in discharge chemistry, providing numerically accurate chemical concentrations when compared to monitoring data, and correctly predicting deacidification rate and extent. The ILWAS model generally meets these criteria, indicating that the model can produce a reliable forecast of the effects of acid deposition on the acid-base chemistry of surface waters given sufficient temporal data for confident optimization of the calibrated variables in the model. RP EARY, LE (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 47 TC 1 Z9 1 U1 1 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD MAR PY 1994 VL 74 IS 1-2 BP 29 EP 63 DI 10.1007/BF01257147 PG 35 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA NK446 UT WOS:A1994NK44600003 ER PT J AU DUYAR, C DRAPER, JE RUBEL, EC DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS BECK, EM STOYER, MA AF DUYAR, C DRAPER, JE RUBEL, EC DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS BECK, EM STOYER, MA TI HIGH-SPIN TE-117(52) - ROTATIONAL BANDS - NONCOLLECTIVE OBLATE SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Note ID INTRUDER BANDS; STATES AB Te-117 has been studied via 82Se(40Ar,5n)117Te, and a new, substantially extended level scheme is proposed to 1 almost-equal-to 53/2. Our TRS calculations suggest rotational bands, but with an experimental sensitivity of almost-equal-to 2%, we see none. Our results differ from those of Sharma, et al, who report two isolated E2 bands. We find them less band-like, being joined at the top and changed in content and order. We suggest a noncollective oblate shape for a new 39/2- level. C1 ALEXANDER VONHUMBOLDT FDN,D-53173 BONN,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP DUYAR, C (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 12 TC 15 Z9 15 U1 0 U2 0 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 MAR PY 1994 VL 348 IS 1 BP 63 EP 64 DI 10.1007/BF01291656 PG 2 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA ND476 UT WOS:A1994ND47600012 ER PT J AU ADAMS, MR ADERHOLZ, M AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KADIJA, K KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, CW SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T AF ADAMS, MR ADERHOLZ, M AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KADIJA, K KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, CW SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI PRODUCTION OF NEUTRAL STRANGE PARTICLES IN MUON-NUCLEON SCATTERING AT 490 GEV SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CHARGED-CURRENT INTERACTIONS; LUND MONTE-CARLO; JET FRAGMENTATION; E+E ANNIHILATION; HIGH-ENERGY; QUARK SUPPRESSION; NU-P; PHYSICS; COLLISIONS; NUBARP AB The production of K0, LAMBDA and LAMBDABAR particles is studied in the E665 muon-nucleon experiment at Fermilab. The average multiplicities and squared transverse momenta are measured as a function of x(F) and W2. Most features of the data can be well described by the Lund model. Within this model, the data on the K0/pi+/- ratios and on the average K0 multiplicity in the forward region favor a strangeness suppression factor s/u in the fragmentation process near 0.20. Clear evidence for QCD effects is seen in the average squared transverse momentum of K0 and LAMBDA particles. C1 UNIV FREIBURG,W-7800 FREIBURG,GERMANY. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MARYLAND,COLL PK,MD 20742. ARGONNE NATL LAB,ARGONNE,IL 60439. HARVARD UNIV,CAMBRIDGE,MA 02138. MIT,CAMBRIDGE,MA 02139. NORTHWESTERN UNIV,EVANSTON,IL 60201. INST NUCL PHYS,KRAKOW,POLAND. ACAD MIN & MET,INST NUCL PHYS,KRAKOW,POLAND. MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV GESAMTHSCH WUPPERTAL,W-5600 WUPPERTAL 1,GERMANY. YALE UNIV,NEW HAVEN,CT 06520. RP ADAMS, MR (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. NR 39 TC 27 Z9 28 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 MAR PY 1994 VL 61 IS 4 BP 539 EP 549 PG 11 WC Physics, Particles & Fields SC Physics GA ND475 UT WOS:A1994ND47500001 ER PT J AU BACHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BRINKMANN, D BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FOKA, P FUCHS, M GAZDZICKI, M GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M JACOBS, PM KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, JY LJUBICIC, A MARGETIS, S MITCHELL, JT MORSE, RJ NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSA, F POSKANZER, AM PUGH, HG PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R RETYK, W ROLAND, G ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHAMBACH, J SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TINCKNELL, ML VASSILEIADIS, G VASSILIOU, M VESZTERGOMBI, G VRANIC, D WENIG, S WOSIEK, B AF BACHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BRINKMANN, D BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FOKA, P FUCHS, M GAZDZICKI, M GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M JACOBS, PM KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, JY LJUBICIC, A MARGETIS, S MITCHELL, JT MORSE, RJ NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSA, F POSKANZER, AM PUGH, HG PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R RETYK, W ROLAND, G ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHAMBACH, J SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TINCKNELL, ML VASSILEIADIS, G VASSILIOU, M VESZTERGOMBI, G VRANIC, D WENIG, S WOSIEK, B TI AN INVESTIGATION OF INTERMITTENCY IN PROTON-GOLD, OXYGEN-GOLD, SULFUR-GOLD AND SULFUR-SULFUR INTERACTIONS AT 200 GEV PER NUCLEON SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HEAVY-ION COLLISIONS; HIGH-ENERGY COLLISIONS; FACTORIAL MOMENTS; MULTIDIMENSIONAL INTERMITTENCY; MULTIPLICITY FLUCTUATIONS; MULTIPARTICLE PRODUCTION; 2-PARTICLE CORRELATIONS; 250 GEV/C; INTERFEROMETRY; DENSITIES AB The intermittency phenomenon is investigated in Proton-gold, oxygen-gold, sulphur-gold and sulphur-sulphur collisions at 200 GeV per nucleon. The data were taken with the NA35 streamer chamber detector at the CERN SPS. The data samples are carefully corrected for, double counting of tracks and for contamination from photon conversions, particle decays and secondary interactions. The analysis is carried Out in terms of factorial moments, using a new definition, and of correlation integrals. Both methods show the presence of nonstatistical fluctuations (''intermittency''). The main conclusions are: The observation of the effect for pairs of hadrons with negative charges and its near absence for pairs of opposite charges is consistent with the assumption that Bose-Einstein correlations yield the dominant contribution. The ''intermittency'' effect is not proportional to (dn/dy)-1 which would be expected in superposition models. The measured relation between the second and third factorial moment for negative hadrons indicates that genuine 3-particle correlations are small. The predictions of a Monte Carlo simulation which is based on the Lund Fritiof model with the inclusion of Bose-Einstein correlations agree with the experimental results. C1 UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. UNIV ATHENS, DEPT PHYS, GR-15771 ATHENS, GREECE. INST NUCL PHYS, PL-30055 KRAKOW, POLAND. UNIV FRANKFURT, FACHBEREICH PHYS, D-60486 FRANKFURT, GERMANY. MAX PLANCK INST PHYS & ASTROPHYS, D-80805 MUNICH, GERMANY. RUDJER BOSKOVIC INST, 41001 ZAGREB, CROATIA. UNIV WARSAW, INST EXPTL PHYS, PL-00681 WARSAW, POLAND. LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. GESELL SCHWERIONERFORSCH MBH, D-64220 DARMSTADT, GERMANY. INST NUCL STUDIES, PL-00681 WARSAW, POLAND. UNIV MARBURG, FACHBEREICH PHYS, D-35037 MARBURG, GERMANY. RP UNIV FREIBURG, FAK PHYS, D-79104 FREIBURG, GERMANY. NR 53 TC 22 Z9 22 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD MAR PY 1994 VL 61 IS 4 BP 551 EP 561 PG 11 WC Physics, Particles & Fields SC Physics GA ND475 UT WOS:A1994ND47500002 ER PT J AU BALL, J CHESNY, P COMBET, M FONTAINE, JM KUNNE, R LEMAIRE, MC SANS, JL BYSTRICKY, J LAC, CD LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L BACH, P DEMIERRE, P GAILLARD, G HESS, R RAPIN, D SORMANI, P GOUDOUR, JP BINZ, R KLETT, A PESCHINAKLETT, R ROSSLE, E SCHMITT, H BARABASH, LS JANOUT, Z KHACHATUROV, BA USOV, YA LOPIANO, D SPINKA, H AF BALL, J CHESNY, P COMBET, M FONTAINE, JM KUNNE, R LEMAIRE, MC SANS, JL BYSTRICKY, J LAC, CD LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L BACH, P DEMIERRE, P GAILLARD, G HESS, R RAPIN, D SORMANI, P GOUDOUR, JP BINZ, R KLETT, A PESCHINAKLETT, R ROSSLE, E SCHMITT, H BARABASH, LS JANOUT, Z KHACHATUROV, BA USOV, YA LOPIANO, D SPINKA, H TI MEASUREMENTS OF THE 2 AND 3 SPIN-INDEX OBSERVABLES IN NP ELASTIC-SCATTERING BETWEEN 0.80 AND 1.10 GEV SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID ANGULAR-DEPENDENCE; ANALYZING POWER; TARGET; PROTON; BEAM AB We present data of several rescattering observables measured in np elastic scattering between 0.80 and 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the Saclay polarized frozen-spin proton, target. Three different configurations of beam and target polarization directions were used: the observables D(onon) and K(onno) were measured with the normal-normal spin configuration at eight energies; N(onkk), D(os'' ok) and K(os'' ko) were determined with the longitudinal-longitudinal configuration at six energies; N(onsk), D(os'' ok) and K(os'' so) with the sideway-longitudinal configuration at six energies. Part of the data was obtained with an unpolarized CH2 target where only the two spin-index polarization transfer parameters K(os'' ko) and K(os'' so) were determined. Data are compared with phase shift analyses predictions and with the LAMPF results at 0.788 GeV. Present results are the first measurements of rescattering observables above 0.80 GeV. They provide an important contribution to any future theoretical or phenomenological analysis. C1 CE SACLAY,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. CE SACLAY,DSM,CEA,F-91191 GIF SUR YVETTE,FRANCE. UNIV GENEVA,DPNC,CH-1211 GENEVA 4,SWITZERLAND. CENB,F-33170 GRADIGNAN,FRANCE. FREIBURG UNIV,FAC PHYS,W-7800 FREIBURG,GERMANY. LNP,JINR,MOSCOW 101000,RUSSIA. ANL,HEP,ARGONNE,IL 60439. RP BALL, J (reprint author), LAB NATL SATURNE,IN2P3,CNRS,F-91191 GIF SUR YVETTE,FRANCE. NR 20 TC 7 Z9 7 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD MAR PY 1994 VL 61 IS 4 BP 579 EP 585 DI 10.1007/BF01552624 PG 7 WC Physics, Particles & Fields SC Physics GA ND475 UT WOS:A1994ND47500005 ER PT J AU YUNG, K YEE, J KOO, J RUBIN, M NEWMAN, N ROSS, J AF YUNG, K YEE, J KOO, J RUBIN, M NEWMAN, N ROSS, J TI OBSERVATION OF STIMULATED-EMISSION IN THE NEAR-ULTRAVIOLET FROM A MOLECULAR-BEAM EPITAXY-GROWN GAN FILM ON SAPPHIRE IN A VERTICAL-CAVITY, SINGLE-PASS CONFIGURATION SO APPLIED PHYSICS LETTERS LA English DT Article ID ROOM-TEMPERATURE; MOVPE AB We report the first observation of stimulated emission from a GaN film grown by ion-assisted molecular beam epitaxy. The observed near-UV optical emission power was a nonlinear function of the pump power density. The characteristics of the observed stimulated emission are similar to those observed recently from films grown with low-pressure metalorganic chemical vapor deposition techniques. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP YUNG, K (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 NR 6 TC 29 Z9 29 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 28 PY 1994 VL 64 IS 9 BP 1135 EP 1137 DI 10.1063/1.110830 PG 3 WC Physics, Applied SC Physics GA MZ337 UT WOS:A1994MZ33700027 ER PT J AU NILES, DW HOCHST, H AF NILES, DW HOCHST, H TI ATOM AND BOND CENTERED LOCALIZED VALENCE-BAND STATES IN CD0.5ZN0.5TE ALLOYS SO APPLIED PHYSICS LETTERS LA English DT Article ID II-VI SEMICONDUCTORS; SELECTION-RULES; PHOTOEMISSION; ZINC AB Angle-resolved valence-band photoemission spectroscopy is used to analyze the local electronic structure in Cd0.5Zn0.5Te(100) alloy films. Localized alloy valence-band states may be divided into two categories: (1) Atom centered states associated with Cd 4d and Zn 3d core-like states, and (2) bond centered states associated with the X6 critical point of the split-off band. While the atom centered states show distinct emission and no intermixing between Cd 4d and Zn 3d bands near the GAMMA point, bond centered X6 states are mixed but split by approximately 0.4 eV. We discuss our experimental results within the framework of Wei and Zungers structural model, and show how far experimental evidence corroborates their theory. C1 SYNCHROTRON RADIAT CTR,STOUGHTON,WI 53589. RP NILES, DW (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 18 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 28 PY 1994 VL 64 IS 9 BP 1147 EP 1149 DI 10.1063/1.110834 PG 3 WC Physics, Applied SC Physics GA MZ337 UT WOS:A1994MZ33700031 ER PT J AU KOCKS, UF AF KOCKS, UF TI MECHANISMS AND MODELS FOR LARGE-STRAIN HETEROGENEOUS PLASTICITY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT NATO Advanced Research Workshop on Polyphase Polycrystal Plasticity CY MAY 17-21, 1993 CL PALM SPRINGS, CA SP NATO, SCI AFFAIRS PROGRAM ID DEFORMATION; POLYCRYSTALS AB Two features are of predominant importance for the large-strain plastic deformation of heterogeneous materials: the connectivity of the phases, and the spread of their strengths. When the softer phase is continuous and the harder phase is not, the non-uniformity of deformation is the greater, the greater the spread of strengths. When there are many hard inclusions, the altered flow patterns are significant far away from the particles, and effective-medium models are inapplicable. In cases where ''self-consistent'' models should apply, the main problem is the derivation of the interaction stiffness for grossly non-linear materials: it controls the relative spread of stresses and strains or strain rates. Reasons are given why, for the actual form of the constitutive relations, a large spread of stresses is more tolerable in a model than a large spread of strain rates. RP KOCKS, UF (reprint author), LOS ALAMOS NATL LAB,MAIL STOP K-765,LOS ALAMOS,NM 87545, USA. RI Kocks, Fred/E-1159-2011 NR 20 TC 6 Z9 6 U1 0 U2 0 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 FEB 28 PY 1994 VL 175 IS 1-2 BP 49 EP 54 DI 10.1016/0921-5093(94)91044-8 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA MY278 UT WOS:A1994MY27800009 ER PT J AU BARBER, DJ WENK, HR HEARD, HC AF BARBER, DJ WENK, HR HEARD, HC TI THE PLASTIC-DEFORMATION OF POLYCRYSTALLINE DOLOMITE - COMPARISON OF EXPERIMENTAL RESULTS WITH THEORETICAL PREDICTIONS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT NATO Advanced Research Workshop on Polyphase Polycrystal Plasticity CY MAY 17-21, 1993 CL PALM SPRINGS, CA SP NATO, SCI AFFAIRS PROGRAM ID TEXTURE DEVELOPMENT; CALCITE POLYCRYSTALS; MODEL AB The trigonal carbonate mineral dolomite is plastically highly anisotropic with some orientations much more favored for slip over others. The plastic behaviour for polycrystalline dolomite in compression is modelled using a model of single slip, the Taylor theory of homogeneous strain and the viscoplastic self-consistent theory of Molinari et al. The theoretical results are compared with the findings of optical and TEM microstructural analyses of 175 individual grains in polycrystals of Crevola dolomite that had been deformed in the temperature range 25-900-degrees-C. There is broad agreement between experiment and theory from some viewpoints (e.g. the expected mechanisms are operative and the stress axes of grains move in the senses which are predicted), but discrepancies also exist at both the macroscopic and microscopic level. Taking into account all grains that can be analyzed, the number of plastic deformation mechanisms observed averages to 1.9 per grain, which is below the value of 4.9 (for high temperature) and 4.3 (for low temperature) predicted from a viscoplastic Taylor model, counting those systems which contribute at least 10% to the total shear in each grain. It is closer to predictions from a viscoplastic self-consistent model with an average of 1.7 and 3.1 systems respectively. The heterogeneity which is caused by such a small number of slip systems, is partly expressed by brittle and grain boundary effects. In addition it is manifest as a sub-grainscale variability of slip activity and dislocation density that is at least equally important. The deformation mechanisms operative do not always agree with predictions based on Schmid factors which is mainly due to local interaction between grains and their neighbors. C1 UNIV ESSEX,DEPT PHYS,COLCHESTER CO4 3SQ,ESSEX,ENGLAND. UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 32 TC 18 Z9 18 U1 0 U2 6 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 FEB 28 PY 1994 VL 175 IS 1-2 BP 83 EP 104 DI 10.1016/0921-5093(94)91048-0 PG 22 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA MY278 UT WOS:A1994MY27800013 ER PT J AU BOLMARO, RE BROWNING, RV GUERRA, FM ROLLETT, AD AF BOLMARO, RE BROWNING, RV GUERRA, FM ROLLETT, AD TI TEXTURE DEVELOPMENT IN AG-NI POWDER COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT NATO Advanced Research Workshop on Polyphase Polycrystal Plasticity CY MAY 17-21, 1993 CL PALM SPRINGS, CA SP NATO, SCI AFFAIRS PROGRAM ID 2ND PHASE PARTICLES; DEFORMATION; ALUMINUM; ALLOYS; RECRYSTALLIZATION; POLYCRYSTALS; COPPER AB Both theoretical and experimental studies of texture development in two-phase materials are presented. Finite-element techniques are used in order to characterize the strain and rotation sharing between the two phases. Different volume fractions of Ag-Ni powder composites were simulated in two-dimensional deformation until a von Mises equivalent strain of 1.25. Some average parameters were obtained and used to interpret texture results. 25%Ag-Ni, 50%Ag-Ni and 75%Ag-Ni powder composite samples were deformed in free compression and the texture measured every 20% strain. The texture evolution for Ag shows a saturation due to high internal rotation of this phase. The Ni texture shows a continuous strengthening until it even surpasses the strength of the Ag phase at high deformations. Also some textures for 50%Ag-50%Ni composites deformed by rolling are shown. The Ni texture strength is also shown to be higher than the Ag texture at high deformations. This phenomenon is explained by the finite-element simulations and strain path changes. The two phases deform at different paces, which is beneficial for Ag as a softer phase, but they also spin around one another with different rate, which happens to be beneficial for Ni phase strengthening its texture. C1 UNR,FAC CIENCIAS EXACTAS INGN & AGRIMENSURA,RA-2000 ROSARIO,ARGENTINA. LOS ALAMOS NATL LAB,DIV DESIGN ENGN,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,UNR,CONICET,LOS ALAMOS,NM 87545. RP BOLMARO, RE (reprint author), UNR,CONICET,INST FIS ROSARIO,BV 27 FEBRERO 210 BIS,RA-2000 ROSARIO,ARGENTINA. RI Rollett, Anthony/A-4096-2012; Bolmaro, Raul/H-6520-2016 OI Rollett, Anthony/0000-0003-4445-2191; Bolmaro, Raul/0000-0002-8218-6958 NR 43 TC 8 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD FEB 28 PY 1994 VL 175 IS 1-2 BP 113 EP 124 DI 10.1016/0921-5093(94)91050-2 PG 12 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA MY278 UT WOS:A1994MY27800015 ER PT J AU ZHU, W HUANG, Y KOURI, DJ ARNOLD, M HOFFMAN, DK AF ZHU, W HUANG, Y KOURI, DJ ARNOLD, M HOFFMAN, DK TI TIME-INDEPENDENT WAVE-PACKET FORMS OF SCHRODINGER AND LIPPMANN-SCHWINGER EQUATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID POTENTIAL-ENERGY SURFACE; REACTIVE COLLISIONS; H+H2 REACTION; SCATTERING; PROBABILITIES; ACCURATE; H-3 AB Time-independent wave-packet forms of the Schrodinger equation (TIWSE) and Lippmann-Schwinger Schwinger equation (TIWLSE) have been derived by a partial time-to-energy Fourier transform of L2 wave-packet solutions to the time-dependent Schrodinger equation. The new equations retain the initial wave packet chi(tau0) as a ''universal source'' of scattered waves, which applies for all collision energies E contained in the initial wave packet. The relationship between the solution psi(tau)0(E) of the TIWSE or TIWLSE and the scattering solution psi(+)(E) of the standard time-independent Lippmann-Schwinger or Schrodinger equation is given and the method illustrated by a computational application. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. RP ZHU, W (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 25 TC 44 Z9 44 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 28 PY 1994 VL 72 IS 9 BP 1310 EP 1313 DI 10.1103/PhysRevLett.72.1310 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600002 ER PT J AU KOWITT, MS GIDAL, G HO, PM LUK, KB PRIPSTEIN, D ISENHOWER, LD SADLER, ME SCHNATHORST, R SCHWINT, R LEDERMAN, LM SCHUB, MH BROWN, CN COOPER, WE GLASS, HD GOUNDER, KN MISHRA, CS BOISSEVAIN, J CAREY, TA JANSEN, DM JEPPESEN, RG KAPUSTINSKY, JS LANE, DW LEITCH, MJ LILLBERG, JW MCGAUGHEY, PL MOSS, JM PENG, JC KAPLAN, DM LUEBKE, WR MARTIN, VM PRESTON, RS SA, J TANIKELLA, V CHILDERS, RL DARDEN, CW WILSON, JR KIANG, GC TENG, PK CHEN, YC AF KOWITT, MS GIDAL, G HO, PM LUK, KB PRIPSTEIN, D ISENHOWER, LD SADLER, ME SCHNATHORST, R SCHWINT, R LEDERMAN, LM SCHUB, MH BROWN, CN COOPER, WE GLASS, HD GOUNDER, KN MISHRA, CS BOISSEVAIN, J CAREY, TA JANSEN, DM JEPPESEN, RG KAPUSTINSKY, JS LANE, DW LEITCH, MJ LILLBERG, JW MCGAUGHEY, PL MOSS, JM PENG, JC KAPLAN, DM LUEBKE, WR MARTIN, VM PRESTON, RS SA, J TANIKELLA, V CHILDERS, RL DARDEN, CW WILSON, JR KIANG, GC TENG, PK CHEN, YC TI PRODUCTION OF J/PSI AT LARGE X(F) IN 800 GEV/C P-COPPER AND P-BERYLLIUM COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PSI' PRODUCTION; NUCLEI; PROTON; PI+/ AB The differential cross sections dsigma/dx(F) for J/psi produced inclusively in 800 GeV/c p-Cu and p-Be collisions have been measured in the kinematic range 0.30 less-than-or-equal-to x(F) less-than-or-equal-to 0.95 through the decay mode J/psi --> mu+ mu-. They are compared with the predictions of the semilocal duality model for several sets of parton density functions. No evidence for a suggested intrinsic charm contribution to the cross section is observed. The ratio of the differential cross sections for Cu and Be targets confirms the suppression of J/psi production in heavy nuclei at large x(F). C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ABILENE CHRISTIAN UNIV,ABILENE,TX 79699. UNIV CHICAGO,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NO ILLINOIS UNIV,DE KALB,IL 60115. UNIV S CAROLINA,COLUMBIA,SC 29208. ACAD SINICA,INST PHYS,TAIPEI 115,TAIWAN. NATL CHENG KUNG UNIV,TAINAN,TAIWAN. NR 19 TC 63 Z9 64 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 FEB 28 PY 1994 VL 72 IS 9 BP 1318 EP 1321 DI 10.1103/PhysRevLett.72.1318 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600004 ER PT J AU HARTOUNI, EP JENSEN, DA KREISLER, MN URIBE, J CHURCH, MD GOTTSCHALK, EE KNAPP, BC STERN, BJ WIENCKE, LR CHRISTIAN, DC GUTIERREZ, G WEHMANN, A AVILEZ, C FORBUSH, M HUSON, FR WHITE, JT AF HARTOUNI, EP JENSEN, DA KREISLER, MN URIBE, J CHURCH, MD GOTTSCHALK, EE KNAPP, BC STERN, BJ WIENCKE, LR CHRISTIAN, DC GUTIERREZ, G WEHMANN, A AVILEZ, C FORBUSH, M HUSON, FR WHITE, JT TI PRECISE MEASUREMENT OF THE LAMBDA-0 AND LAMBDA-OVER-BAR(0) MASSES AND A TEST OF CPT INVARIANCE SO PHYSICAL REVIEW LETTERS LA English DT Article AB A precision measurement of the masses of the LAMBDA0 and LAMBDA0BAR hyperons is obtained from Gaussian fits to the invariant mass distributions for 20 138 LAMBDA0,s and 18 309 LAMBDA0BAR,s. The Gaussians have standard deviations of 0.49 and 0.51 MeV/c2 for the LAMBDA0 and LAMBDA0BAR, respectively. Systematic errors were reduced by calibrating the spectrometer with 60000 exclusive events containing a K(S)0 We find M(LAMBDA) = 1115.678 +/- 0.006 +/- 0.006 MeV/c2 and M(LAMBDA)- = 15.690 +/- 0.008 +/- 0.006 MeV/c2. The LAMBDA0-LAMBDA0BAR mass difference testing CPT invariance is -0.012 +/- 0.010 MeV/c2. C1 COLUMBIA UNIV,NEVIS LABS,IRVINGTON,NY 10533. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV GUANAJUATO,INST FIS,LEON,GUANAJUATO,MEXICO. TEXAS A&M UNIV,DEPT PHYS,COLL STN,TX 77843. RP HARTOUNI, EP (reprint author), UNIV MASSACHUSETTS,DEPT PHYS & ASTRON,AMHERST,MA 01003, USA. OI Hartouni, Edward/0000-0001-9869-4351 NR 15 TC 17 Z9 17 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 28 PY 1994 VL 72 IS 9 BP 1322 EP 1325 DI 10.1103/PhysRevLett.72.1322 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600005 ER PT J AU COOPER, F DAWSON, JF MEREDITH, D SHEPARD, H AF COOPER, F DAWSON, JF MEREDITH, D SHEPARD, H TI SEMIQUANTUM CHAOS SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM; SYSTEMS AB We consider a system in which a classical oscillator is interacting with a purely quantum mechanical oscillator, described by the Lagrangian L = 1/2x2 + 1/2A2 - 1/2(m2 + e2A2)x2, where A is a classical variable and x is a quantum operator. With [x(t)] = 0, the relevant vaxiable for the quantum oscillator is [x(t)x(t)] = G(t). The classical Hamiltonian dynamics governing the variables A(t), PI(A)(t), G(t), and PI(G)(t) is chaotic so that the results of making measurements on the quantum system at later times are sensitive to initial conditions. This system arises as the zero momentum part of the problem of pair production of charged scalar particles by a strong external electric field. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP COOPER, F (reprint author), UNIV NEW HAMPSHIRE,DEPT PHYS,DURHAM,NH 03824, USA. NR 12 TC 40 Z9 40 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 FEB 28 PY 1994 VL 72 IS 9 BP 1337 EP 1340 DI 10.1103/PhysRevLett.72.1337 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600009 ER PT J AU ALLEN, SL BROWN, MD BYERS, JA CASPER, TA COHEN, BI COHEN, RH FENSTERMACHER, ME FOOTE, JH HOOPER, EB LASNIER, CJ LOPEZ, P MAKOWSKI, MA MARINAK, MM MEYER, WH MOLLER, JM NEVINS, WM RICE, BW ROGNLIEN, TD SMITH, GR STALLARD, BW SCHARLEMANN, ET THOMASSEN, KI WOOD, RD HOSHINO, K OASA, K ODA, T ODAJIMA, K OGAWA, T OHGO, T AF ALLEN, SL BROWN, MD BYERS, JA CASPER, TA COHEN, BI COHEN, RH FENSTERMACHER, ME FOOTE, JH HOOPER, EB LASNIER, CJ LOPEZ, P MAKOWSKI, MA MARINAK, MM MEYER, WH MOLLER, JM NEVINS, WM RICE, BW ROGNLIEN, TD SMITH, GR STALLARD, BW SCHARLEMANN, ET THOMASSEN, KI WOOD, RD HOSHINO, K OASA, K ODA, T ODAJIMA, K OGAWA, T OHGO, T TI NONLINEAR ABSORPTION OF HIGH-POWER FREE-ELECTRON-LASER-GENERATED MICROWAVES AT ELECTRON-CYCLOTRON-RESONANCE HEATING FREQUENCIES IN THE MTX TOKAMAK SO PHYSICAL REVIEW LETTERS LA English DT Article ID CURRENT DRIVE; PLASMAS; WAVE; EXTRACTION; EFFICIENCY; INTENSE AB We report the first measurements of single-pass propagation of intense (>1-GW, 20-ns) microwaves through a high-density [n(e)=(0.5-2.4) x 10(20) m-3] tokamak plasma at 140 GHz, the fundamental electron cyclotron resonance frequency. Compared with low-power pulses, these free electron laser generated intense pulses were not as strongly absorbed by the plasma, in agreement with predictions of nonlinear theory. Enhanced absorption of intense pulses was achieved by increasing the gradient in the parallel index of refraction (N(parallel-to) of the microwave beam. C1 JAPAN ATOM ENERGY RES INST,NAKA,JAPAN. FUKUOKA UNIV EDUC,FUKUOKA,JAPAN. HIROSHIMA UNIV,HIROSHIMA 730,JAPAN. RP ALLEN, SL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 19 TC 16 Z9 16 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 FEB 28 PY 1994 VL 72 IS 9 BP 1348 EP 1351 DI 10.1103/PhysRevLett.72.1348 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600012 ER PT J AU NICKEL, JH MORRIS, DE AGER, JW AF NICKEL, JH MORRIS, DE AGER, JW TI SITE-SELECTIVE OXYGEN-ISOTOPE SHIFT IN YBA2CU3O7 - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID HIGH-TC SUPERCONDUCTORS; TEMPERATURE C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MORNS RES,BERKELEY,CA 94704. NR 12 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 28 PY 1994 VL 72 IS 9 BP 1389 EP 1389 DI 10.1103/PhysRevLett.72.1389 PG 1 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600023 ER PT J AU KOSHTI, N HUBER, V SMITH, P GOPALAN, AS AF KOSHTI, N HUBER, V SMITH, P GOPALAN, AS TI DESIGN AND SYNTHESIS OF ACTINIDE SPECIFIC CHELATORS - SYNTHESIS OF NEW CYCLAM TETRAHYDROXAMATE (CYTROX) AND CYCLAM TETRAACETONYLACETONE (CYTAC) CHELATORS SO TETRAHEDRON LA English DT Article ID SEQUESTERING AGENTS; METAL-IONS; LIGANDS; COMPLEXATION; ANALOGS; SIDEROPHORES; BINDING; CRYSTAL; CATIONS AB Molecular modeling shows that two new chelators, the cyclam tetrahydroxamate, 1, and the cyclam tetraacetonylaeetone derivative, 2, have potential for the binding of plutonium (IV). The synthesis of these chelators has been achieved using short sequences from readily available cyclam. Both the details of the molecular modeling and the synthetic route to these molecules are described. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NEW MEXICO STATE UNIV,DEPT CHEM & BIOCHEM,LAS CRUCES,NM 88003. NR 48 TC 11 Z9 11 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4020 J9 TETRAHEDRON JI Tetrahedron PD FEB 28 PY 1994 VL 50 IS 9 BP 2657 EP 2664 DI 10.1016/S0040-4020(01)86981-7 PG 8 WC Chemistry, Organic SC Chemistry GA MY730 UT WOS:A1994MY73000002 ER PT J AU CROMACK, KR WERST, DW BARNABAS, MV TRIFUNAC, AD AF CROMACK, KR WERST, DW BARNABAS, MV TRIFUNAC, AD TI LOW-TEMPERATURE STUDY OF RADICAL CATIONS OF QUADRICYCLANE AND NORBORNADIENE IN NA-ZSM-5 ZEOLITES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID IRRADIATED FROZEN-SOLUTIONS; ELECTRON-SPIN-RESONANCE; OLEFINS; SYSTEM; DIENES; ESR AB We have observed quadricyclane and norbornadiene radical cations in different pentasil type zeolites by EPR spectroscopy after 4 K in situ electron beam irradiation of samples in the EPR spectrometer. We report the first evidence for matrix isolation of the quadricyclane radical cation. It is stable in polar Na-ZSM-5 zeolites below 20-30 K. Formation of the bicyclo[3.2.0]-hepta-2,6-diene radical cation is observed in both quadricyclane- and norbornadiene-loaded zeolites. The onset temperature for the formation of the bicyclo[3.2.0]hepta-2,6-diene radical cation depends on the substrate concentration and zeolite polarity and was as low as 30 K in polar zeolites when the substrate concentration was high. RP CROMACK, KR (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 21 TC 20 Z9 20 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 25 PY 1994 VL 218 IS 5-6 BP 485 EP 491 DI 10.1016/0009-2614(94)00026-3 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MZ389 UT WOS:A1994MZ38900016 ER PT J AU KUSKE, CR TICKNOR, LO GUZMAN, E GURLEY, LR VALDEZ, JG THOMPSON, ME JACKSON, PJ AF KUSKE, CR TICKNOR, LO GUZMAN, E GURLEY, LR VALDEZ, JG THOMPSON, ME JACKSON, PJ TI PURIFICATION AND CHARACTERIZATION OF O-ACETYLSERINE SULFHYDRYLASE ISOENZYMES FROM DATURA-INNOXIA SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID L-SERINE SULFHYDRYLASE; CYSTEINE SYNTHASE; GLUTATHIONE; METABOLISM; CADMIUM; LEAVES; O-ACETYLSERINE(THIOL)LYASE; MECHANISM; PROTEINS; OLERACEA AB Three isoenzyme forms (designated A, B, and C) of O-acetylserine sulfhydrylase were purified from Datura innoxia suspension cultures. Isoenzyme A is the most abundant form, comprising 45-60% of the total activity. Isoenzymes C and B comprise 35-40% and 10-20% of the activity, respectively. The specific activities of the purified isoenzymes are similar (870-893 mu mol of cysteine/min/mg of protein). Molecular masses for isoenzymes A, B, and C, estimated by analytical size exclusion high performance Liquid chromatography, are 63, 86, and 63 kDa, respectively. Isoenzymes A and B are homodimers; isoenzyme C is a heterodimer. Spectral analysis indicates that these isoenzymes possess a pyridoxal 5'-phosphate cofactor that binds the O-acetylserine substrate. Binding is reversible by addition of the sulfide substrate. The O-acetylserine sulfhydrylase isoenzymes are active over a broad temperature range, with maximum activity between 42 and 58 degrees C. They are active only between pH 7 and 8, with optimal activity at pH 7.6. Kinetic analysis indicates these enzymes are allosterically regulated and exhibit positive cooperativity with respect to both substrates. They are inhibited by sulfide concentrations above 200 mu M. The kinetic analysis together with the physical and spectrophotometric characteristics indicate that the O-acetylserine sulfhydrylase enzymes have two active sites. C1 LOS ALAMOS NATL LAB, DIV ANAL & ASSESSMENT, STAT GRP, LOS ALAMOS, NM 87545 USA. RP KUSKE, CR (reprint author), LOS ALAMOS NATL LAB, DIV LIFE SCI, LOS ALAMOS, NM 87545 USA. NR 55 TC 35 Z9 35 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 EI 1083-351X J9 J BIOL CHEM JI J. Biol. Chem. PD FEB 25 PY 1994 VL 269 IS 8 BP 6223 EP 6232 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MY840 UT WOS:A1994MY84000110 PM 8119966 ER PT J AU WANG, LW ZUNGER, A AF WANG, LW ZUNGER, A TI ELECTRONIC-STRUCTURE PSEUDOPOTENTIAL CALCULATIONS OF LARGE (APPROXIMATE-TO-1000 ATOMS) SI QUANTUM DOTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID POROUS SILICON; SEMICONDUCTOR CLUSTERS; OPTICAL-PROPERTIES; CHEMISORPTION; EXCITON; SURFACE; MICROSTRUCTURE; 1ST-PRINCIPLES; HYDROGEN; SPECTRA AB The electronic structure of quantum dots containing N greater than or equal to 1000 atoms is difficult to calculate by conventional molecular methods since the effort scales as N-3. Our newly developed method allows calculation of eigenstates within a desired ''energy window'' and thus has a linear-in-N scaling. This method is applied here to Si quantum dots using a plane wave basis expansion and an empirical pseudopotential Hamiltonian. Hydrogen atoms passivate the surface dangling bonds using a realistic surface relaxation geometry. We investigate the dependences of energy gaps and radiative recombination rates on the size, shape, and orientation of the Si quantum dots. We find that (1) a unified curve exists for band gap vs size of quantum spheres, cubes, and rectangular boxes; (2) the band edge states of Si quantum dots are bulklike, not surfacelike; (3) the band gap is insensitive to the surface orientation and to the overall shape of the quantum dot as long as it is not too prolate; (4) the radiative lifetime is sensitive to the shape and orientation; and (5) effective mass and single band truncated crystal models describe inadequately the electronic structure of Si quantum dots in the size range (less than or similar to 40 Angstrom) studied here. C1 NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 56 TC 357 Z9 359 U1 3 U2 24 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 24 PY 1994 VL 98 IS 8 BP 2158 EP 2165 DI 10.1021/j100059a032 PG 8 WC Chemistry, Physical SC Chemistry GA MY355 UT WOS:A1994MY35500032 ER PT J AU CWIOK, S NAZAREWICZ, W SALADIN, JX PLOCIENNIK, W JOHNSON, A AF CWIOK, S NAZAREWICZ, W SALADIN, JX PLOCIENNIK, W JOHNSON, A TI HYPERDEFORMATIONS AND CLUSTERING IN THE ACTINIDE NUCLEI SO PHYSICS LETTERS B LA English DT Article ID HARTREE-FOCK CALCULATIONS; FISSION BARRIER; HEAVIEST ELEMENTS; CROSS-SECTION; MODEL; CONFIGURATIONS; COEXISTENCE; ENERGIES; ISOTOPES; STATES AB Hyperdeformed minima in the actinide nuclei are discussed with the shell correction approach. Calculations are carried out in a large deformation space which makes it possible to provide a realistic description of very elongated shapes up to the fission saddle point. It is shown that the density distribution at the third, hyperdeformed minimum resembles a di-nucleus consisting of a nearly-spherical nucleus around the doubly-magic nucleus 132Sn, and a well-deformed fragment from the neutron-rich A approximately 100 region. C1 ROYAL INST TECHNOL,DEPT PHYS,S-10405 STOCKHOLM,SWEDEN. UNIV PITTSBURGH,PITTSBURGH,PA 15260. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. UNIV WARSAW,INST THEORET PHYS,PL-00681 WARSAW,POLAND. RP CWIOK, S (reprint author), WARSAW UNIV TECHNOL,INST PHYS,UL KOSZYKOWA 75,PL-00662 WARSAW,POLAND. NR 52 TC 115 Z9 117 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 FEB 24 PY 1994 VL 322 IS 4 BP 304 EP 310 DI 10.1016/0370-2693(94)91157-6 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY396 UT WOS:A1994MY39600002 ER PT J AU MURAYAMA, H YANAGIDA, T AF MURAYAMA, H YANAGIDA, T TI LEPTOGENESIS IN SUPERSYMMETRIC STANDARD MODEL WITH RIGHT-HANDED NEUTRINO SO PHYSICS LETTERS B LA English DT Article ID INFLATIONARY UNIVERSE SCENARIO; BARYON ASYMMETRY; ELECTROWEAK THEORY; PHASE-TRANSITION; BARYOGENESIS; BREAKING; OSCILLATIONS; FLUCTUATIONS; GENERATION; GRAVITINOS AB We show that leptogenesis is automatic within the supersymmetric standard model if there exist right-handed neutrinos with mass less than H(inf), the expansion rate during the inflation. Its scalar component grows during the inflation due to the quantum fluctuation, oscillates coherently after the inflation, and its decay generates lepton asymmetry. The scenario is naturally embedded into SO(10) GUT without any modifications. We also discuss the case with heavier right-handed neutrino. C1 TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. RP MURAYAMA, H (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. RI Yanagida, Tsutomu/A-4394-2011; Murayama, Hitoshi/A-4286-2011 NR 43 TC 135 Z9 135 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 FEB 24 PY 1994 VL 322 IS 4 BP 349 EP 354 DI 10.1016/0370-2693(94)91164-9 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY396 UT WOS:A1994MY39600009 ER PT J AU BASTEROGIL, M PEREZMERCADER, J AF BASTEROGIL, M PEREZMERCADER, J TI INFLUENCE OF LIGHT AND HEAVY THRESHOLDS ON SUSY UNIFICATION SO PHYSICS LETTERS B LA English DT Article ID ELECTROWEAK RADIATIVE-CORRECTIONS; EFFECTIVE GAUGE-THEORIES; NO-SCALE SUPERGRAVITY; HADRONIC-Z-DECAYS; GRAND-UNIFICATION; ALPHA-S; PROTON STABILITY; MODEL; LEP; BREAKING AB In this paper we study and compare SUSY unification using two different approaches in order to take into account the effect of light particle thresholds on the evolution of gauge couplings: the step-function approximation, on the one hand, and a mass dependent procedure, which gives a more accurate description of the dependence of the results on the masses, on the other. We also include the effect of heavy thresholds, when SU(5) is chosen as the unifying group. We find that the mass-dependent procedure excludes scenarios where all SUSY masses are below 1 TeV, and favors a value Of alpha3(m(Z)) near its upper experimental bound, contrary to the results obtained with the step-function approximation. We underline the dependence of the results on the procedure chosen to deal with light thresholds. C1 CSIC,INST MATEMAT & FIS FUNDAMENTAL,E-28006 MADRID,SPAIN. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BASTEROGIL, M (reprint author), LAB ASTROFIS ESPACIAL & FIS FUNDAMENTAL,APARTADO 50727,E-28080 MADRID,SPAIN. RI Bastero-Gil, Mar/F-1405-2016 OI Bastero-Gil, Mar/0000-0001-9962-5905 NR 43 TC 12 Z9 12 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 FEB 24 PY 1994 VL 322 IS 4 BP 355 EP 362 DI 10.1016/0370-2693(94)91165-7 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY396 UT WOS:A1994MY39600010 ER PT J AU ZHANG, HZ AF ZHANG, HZ TI GLOBAL CONSTRAINTS OF GAUSS LAW AND THE SOLUTION TO THE STRONG CP PROBLEM SO PHYSICS LETTERS B LA English DT Article ID GAUGE-THEORIES; CHARGE; CONSERVATION; DYONS; MONOPOLES; VACUUM; FIELDS; COLOR AB It is shown that the global constraints of Gauss' law ensure that the vacuum angle must be quantized in pup theories in the presence of magnetic monopoles. Our quantization rule for the vacuum angle is derived as theta = 2piN/n (n not-equal 0) with integer n being the relevant topological charge [1]. of the magnetic monopoles and N is an integer which is not fixed by this method. This provides interesting new understandings and ideas for the strong CP problem and its new solution with the magnetic monopoles as originally proposed recently by the author. Therefore, we conclude [1] again that the strong CP problem can be automatically solved in the presence of magnetic monopoles, the fact that the strong CP-violation can be only so small or vanishing may be a signal for the existence of magnetic monopoles, and the universe is open. If there exists actually the axion field a(x), the value of the physical axion field a(phy) (x) will not be quantized. However, the expectation value of the CP violating density epsilon(munulambdasigma) F(munu)(a)F(lambdasigma)a will be quantized. For the special values of topological number n, it can be vanishing or very small even without using the Peccei-Quinn dynamical adjusting. C1 JACKSON STATE UNIV,POB 17660,JACKSON,MS 39217. RP ZHANG, HZ (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 33 TC 2 Z9 2 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 FEB 24 PY 1994 VL 322 IS 4 BP 382 EP 388 DI 10.1016/0370-2693(94)91169-X PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY396 UT WOS:A1994MY39600014 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DEGENER, T DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, CN PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZOU, B ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DEGENER, T DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, CN PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZOU, B ZUPANCIC, C TI OBSERVATION OF A SCALAR RESONANCE DECAYING TO PI+PI-PI-0-PI-0 IN (P)OVER-BAR-P ANNIHILATION AT REST SO PHYSICS LETTERS B LA English DT Article ID P-STATES; PROTON; SPIN; DOMINANCE; ETA AB We report an analysis of ppBAR annihilation at rest in to rho+rho-pi0 leading to the final state pi+pi-3pi0. A strong signal is observed for a scalar resonance with mass 1374 +/- 38 MeV/c2 and width 375 +/- 61 MeV/c2, decaying to rho+rho-. The resonance in rho+rho- represents 2.0 +/- 0.3% of all ppBAR annihilations at rest. It is also observed to decay into two S-wave dipions (pi+pi-)(pi0pi0). Under the assumption of isospin 0, this is probably f0(1400), seen for the first time in its 4pi decay mode. C1 QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,D-85748 MUNICH,GERMANY. UNIV MUNICH,D-85748 MUNICH,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV CALIF BERKELEY,LBL,BERKELEY,CA 94720. UNIV BOCHUM,D-44780 BOCHUM,GERMANY. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV HAMBURG,D-22761 HAMBURG,GERMANY. UNIV KARLSRUHE,D-76344 KARLSRUHE,GERMANY. RP AMSLER, C (reprint author), UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 31 TC 55 Z9 55 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD FEB 24 PY 1994 VL 322 IS 4 BP 431 EP 440 DI 10.1016/0370-2693(94)91176-2 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY396 UT WOS:A1994MY39600021 ER PT J AU BURRELL, AK BRYAN, JC KUBAS, GJ AF BURRELL, AK BRYAN, JC KUBAS, GJ TI SYNTHESIS OF THE 16-ELECTRON COMPLEX TCCL(DPPE)(2) AND ITS REACTION WITH HYDROGEN TO GIVE TRANS-TC(H-2)CL(DPPE)(2) - THE FIRST ETA(2)-DIHYDROGEN COMPLEX OF TECHNETIUM SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID DIHYDROGEN COMPLEXES; X-RAY; TRANSITION-METALS; HYDRIDE; LIGAND; RECL(H2)(PMEPH2)4; BOND; RU C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP CST3,LOS ALAMOS,NM 87545. NR 31 TC 26 Z9 26 U1 0 U2 1 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 FEB 23 PY 1994 VL 116 IS 4 BP 1575 EP 1576 DI 10.1021/ja00083a055 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MZ287 UT WOS:A1994MZ28700055 ER PT J AU DOSANJH, MK ROY, R MITRA, S SINGER, B AF DOSANJH, MK ROY, R MITRA, S SINGER, B TI 1,N-6-ETHENOADENINE IS PREFERRED OVER 3-METHYLADENINE AS SUBSTRATE BY A CLONED HUMAN N-METHYLPURINE DNA GLYCOSYLASE (3-METHYLADENINE DNA GLYCOSYLASE) SO BIOCHEMISTRY LA English DT Note ID ESCHERICHIA-COLI; TREATED DNA; HUMAN-CELLS; RELEASE; 7-METHYLGUANINE; PROTEIN; CDNA; PURIFICATION; FLUORESCENCE; OXIDATION AB A lethal DNA adduct induced by methylating agents, 3-methyladenine (m(3)A), is removed by both the constitutive (Tag) and inducible (AlkA) bacterial m(3)A-DNA glycosylases. The human 3-methyladenine-DNA glycosylase also releases m(3)A as well as other methylated bases. The rate of release of m(3)A from alkylated DNA by the purified or recombinant human m(3)A glycosylase is much higher than that of the other methylated bases. We now find that a partially purified recombinant human m(3)A-DNA glycosylase, expressed in Escherichia coli, releases at least 10-fold more 1,N-6-ethenoadenine (epsilon A) than m(3)A from DNA. epsilon A is completely unrelated to m(3)A since it is a heterocyclic adduct produced by the carcinogen vinyl chloride. The rates of release of epsilon A and m(3)A were both dependent on protein concentration and time. The differential release of epsilon A and m(3)A occurs regardless of whether DNA containing each adduct is assayed separately or is assayed in a mixed substrate containing both DNAs. This result raises the question of what structural features are involved in recognition and excision by the human m(3)A-DNA glycosylase and what may be its primary substrate. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DONNER LAB, DIV LIFE SCI, BERKELEY, CA 94720 USA. UNIV TEXAS, MED BRANCH, SEALY CTR MOLEC SCI, GALVESTON, TX 77555 USA. UNIV TEXAS, MED BRANCH, DEPT HUMAN BIOL CHEM & GENET, GALVESTON, TX 77550 USA. UNIV TEXAS, MED BRANCH, DEPT RADIAT THERAPY, GALVESTON, TX 77550 USA. FU NCI NIH HHS [CA 47723, CA 53791] NR 29 TC 90 Z9 91 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 22 PY 1994 VL 33 IS 7 BP 1624 EP 1628 DI 10.1021/bi00173a002 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MY842 UT WOS:A1994MY84200002 PM 8110764 ER PT J AU BIONTA, RM SKULINA, KM WEINBERG, J AF BIONTA, RM SKULINA, KM WEINBERG, J TI HARD X-RAY SPUTTERED-SLICED PHASE ZONE PLATES SO APPLIED PHYSICS LETTERS LA English DT Article AB Al/Cu sputtered-sliced phase zone plates, designed to operate with a focal length of 18 cm at 8.05 keV, were tested at the Stanford Synchrotron Radiation Laboratory. First-, second-, and third-order peaks are measured, along with a defocused condition. The first-order focusing efficiencies ranged from 13% to 19% for the two lenses presented here. Monte Carlo simulations are compared to the data. C1 UNIV ARIZONA,TUCSON,AZ 85726. RP BIONTA, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 5 TC 19 Z9 19 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 21 PY 1994 VL 64 IS 8 BP 945 EP 947 DI 10.1063/1.110968 PG 3 WC Physics, Applied SC Physics GA MX448 UT WOS:A1994MX44800001 ER PT J AU HAYNES, TE MORTON, R LAU, SS AF HAYNES, TE MORTON, R LAU, SS TI RELATIONSHIP BETWEEN IMPLANTATION DAMAGE AND ELECTRICAL ACTIVATION IN GALLIUM-ARSENIDE IMPLANTED WITH SI+ SO APPLIED PHYSICS LETTERS LA English DT Article ID DOSE-RATE; GAAS; TEMPERATURE; DEPENDENCE; FLUX AB The relationship between implantation damage and electrical activation has been investigated in GaAs implanted with 100-keV Si-30+ to doses of 5X10(13)/CM2 and 2X10(14)/CM2, using low and moderate beam currents at room temperature (RT) and at slightly elevated temperatures. For a given Si+ dose, the damage, measured by ion channeling immediately after implantation, was varied by more than a factor of 2 over the range of conditions studied. A strong negative correlation was established between this damage and the electrical activation obtained after high-temperature annealing, i.e., an increase in the initial damage led to a decrease in the sheet-carrier concentration. Tle results demonstrate a scheme for increasing the sheet-carrier concentration beyond that typically obtained for high-dose Si in GaAs, namely, by using a slightly elevated implant temperature (approximately 90-degrees-C for a beam current of 1 muA/cm2). In addition, the initial damage is shown to consist of two components; one that is stable at RT and another that is not. The sheet-carrier concentration was found to be affected only by that component of the damage that is stable at RT, although both components were reduced by increasing the implant temperature or by reducing the dose rate. C1 UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. RP HAYNES, TE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 8 TC 26 Z9 26 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 FEB 21 PY 1994 VL 64 IS 8 BP 991 EP 993 DI 10.1063/1.110928 PG 3 WC Physics, Applied SC Physics GA MX448 UT WOS:A1994MX44800017 ER PT J AU GORDON, JS JOHNSON, DC AF GORDON, JS JOHNSON, DC TI APPLICATION OF AN ELECTROCHEMICAL QUARTZ-CRYSTAL MICROBALANCE TO A STUDY OF WATER-ADSORPTION AT GOLD SURFACES IN ACIDIC MEDIA SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID OXYGEN-TRANSFER REACTIONS; ELECTROCATALYTIC BEHAVIOR; ELEMENTARY STEPS; ELECTRODES; OXIDATION; INSITU; AU; DEPOSITION; RESOLUTION; SILVER AB Changes in surface mass at a Au electrode during cyclic voltammetry in acidic media were monitored with an electrochemical quartz-crystal microbalance. An unexpectedly large increase in surface mass was observed during the positive potential scan in the pre-oxide region beginning ca. 0.5 V negative of the potential for onset of formation of surface oxide (AuO). This mass increase is virtually independent of the acid and is interpreted on the basis of adsorption of H2O via hydrogen bonding to the submonolayer of hydrous oxide (AuOH) generated in the pre-oxide region. The mass increase is consistent with an increase in surface hydration by about 32 H2O molecules per AuOH site. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 23 TC 87 Z9 90 U1 2 U2 14 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD FEB 21 PY 1994 VL 365 IS 1-2 BP 267 EP 274 DI 10.1016/0022-0728(94)02965-2 PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA MX377 UT WOS:A1994MX37700033 ER PT J AU SZPAK, S MOSIERBOSS, PA GABRIEL, CJ SMITH, JJ AF SZPAK, S MOSIERBOSS, PA GABRIEL, CJ SMITH, JJ TI ABSORPTION OF DEUTERIUM IN PALLADIUM RODS - MODEL VS EXPERIMENT SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID HYDROGEN AB The electrochemical charging of Pd rods by deuterium involves a complex coupling of electrochemical, interfacial and transport processes. In order to predict the overpotential, surface coverage and bulk loading of the electrode during charging, a model has been developed that incorporates the essential features of these processes and involves variables such as the electrochemical rate constants, the bulk diffusion coefficient and the charging current. Features of the computed time dependence of the bulk loading are then compared with published experimental charging curves. New microscopic observations and X-ray diffraction data provide further evidence for the details of the charging process. C1 USN,DIV E,SAN DIEGO,CA 92152. US DOE,WASHINGTON,DC 20585. RP SZPAK, S (reprint author), USN,NAVAL COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,RDT,SAN DIEGO,CA 92152, USA. NR 9 TC 14 Z9 14 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD FEB 21 PY 1994 VL 365 IS 1-2 BP 275 EP 281 DI 10.1016/0022-0728(93)03051-P PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA MX377 UT WOS:A1994MX37700034 ER PT J AU PERROT, F RASOLT, M AF PERROT, F RASOLT, M TI A NEW LISTING OF THE EFFECTIVE R(S) VALUES FOR METALS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID SURFACE-ENERGY; DENSITY; MODEL AB Using concepts from density functional theory, we provide a list of values for the effective free-electron density parameter r(s) in simple and 3d, 4d and 5d transition metals, which satisfy a necessary condition appropriate for correctly describing ground state properties of arbitrary defects in these systems. As an application, we plot the surface energy gamma of these metals versus the r(s) determined. A very clear correlation between gamma and r(s) is observed, except for the magnetic metals. This list should, therefore, replace the much more ad hoc estimate of the r(s) values used previously. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP PERROT, F (reprint author), CTR ETUD LIMEIL VALENTON,F-94195 VILLENEUVE,FRANCE. NR 11 TC 14 Z9 14 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD FEB 21 PY 1994 VL 6 IS 8 BP 1473 EP 1482 DI 10.1088/0953-8984/6/8/006 PG 10 WC Physics, Condensed Matter SC Physics GA MX815 UT WOS:A1994MX81500006 ER PT J AU BOZOKI, E SAGAN, D AF BOZOKI, E SAGAN, D TI ON THE SHAKING OF IONS IN ELECTRON STORAGE-RINGS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LONGITUDINAL MOTION AB We describe the creation and trapping of ions by an electron beam and the coherent and incoherent instabilities that the trapped ions can cause. The transverse oscillations and longitudinal motion of the ions and the different methods of beam shaking are discussed. The movement of the ions are simulated with and without shaking. We explore the effect of shaking on the stability of ions, as well as the dependence of the size of the effect on the amplitude and frequency of shaking. The effect of neglecting the longitudinal and/or horizontal motion of the ions is studied. A short review is given of experimental work by others on the effects of shaking. C1 CORNELL UNIV,NUCL STUDIES LAB,ITHACA,NY 14853. RP BOZOKI, E (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 30 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 21 PY 1994 VL 340 IS 2 BP 259 EP 271 DI 10.1016/0168-9002(94)90101-5 PG 13 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW885 UT WOS:A1994MW88500002 ER PT J AU JOB, PK PRICE, LE PROUDFOOT, J HANDLER, T GABRIEL, TA AF JOB, PK PRICE, LE PROUDFOOT, J HANDLER, T GABRIEL, TA TI SIMULATION OF THE RECONFIGURABLE-STACK TEST CALORIMETER EXPERIMENTS WITH CALOR89 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PLATE CALORIMETER AB This paper presents the simulation studies with CALOR89 for the Reconfigurable-Stack calorimeter (Hanging Files) test beam measurements conducted at Fermilab during the period of September 91 to January 92. The purpose of this study is to validate the CALOR89 code against the experimental data and to enhance its reliability and predictive power, especially for the multi-segmented SDC calorimeters. The results of the simulation are compared with the measured e/pi ratio, the electromagnetic and hadronic energy resolutions and the longitudinal shower profiles. These comparisons show that the CALOR89 can predict reasonably well the parameters for the scintillating plate calorimeters. We have also identified certain systematic effects in modeling the experimental configurations with CALOR89. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. RP JOB, PK (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 15 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 21 PY 1994 VL 340 IS 2 BP 283 EP 292 DI 10.1016/0168-9002(94)90104-X PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW885 UT WOS:A1994MW88500005 ER PT J AU REEDER, PL AF REEDER, PL TI NEUTRON DETECTION USING GSO SCINTILLATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID GSO AB The response of cerium-doped gadolinium orthosilicate (GSO) scintillator to thermal neutrons has been measured. A distinctive peak is observed in the pulse height spectrum at about 77 keV. It is associated with the de-excitation of the first excited states in Gd-156 and Gd-158 following neutron capture. Applications for thin GSO scintillators as thermal neutron detectors are proposed. RP REEDER, PL (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 10 TC 20 Z9 20 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 FEB 21 PY 1994 VL 340 IS 2 BP 371 EP 378 DI 10.1016/0168-9002(94)90114-7 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW885 UT WOS:A1994MW88500015 ER PT J AU POCANIC, D FRLEZ, E ASSAMAGAN, KA CHEN, JP KEETER, KJ MARSHALL, RM MINEHART, RC SMITH, LC DODGE, GE HANNA, SS KING, BH KNUDSON, JN AF POCANIC, D FRLEZ, E ASSAMAGAN, KA CHEN, JP KEETER, KJ MARSHALL, RM MINEHART, RC SMITH, LC DODGE, GE HANNA, SS KING, BH KNUDSON, JN TI REACTION PI(+)P-]PI(+)PI(0)P NEAR-THRESHOLD AND CHIRAL-SYMMETRY BREAKING SO PHYSICAL REVIEW LETTERS LA English DT Article ID PI-PI-SCATTERING; PERTURBATION-THEORY; CROSS-SECTIONS; QUARK; MODEL; LOOP AB We have measured total cross sections for the reaction pi+p --> pi+pi 0p at incident pion kinetic energies of 190, 200, 220, 240, and 260 MeV. We use this result to deduce a new value of the chiral symmetry breaking parameter, xi = -0.25 +/- 0.10, in a global constrained fit of the five pi pi N near-threshold amplitudes. Consequently, we report new soft pion model values for the s-wave pi pi scattering lengths. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP POCANIC, D (reprint author), UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901, USA. RI Frlez, Emil/B-6487-2013 NR 32 TC 30 Z9 30 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 FEB 21 PY 1994 VL 72 IS 8 BP 1156 EP 1159 DI 10.1103/PhysRevLett.72.1156 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300006 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 BEARDEN, IG AF CROWELL, B CHOWDHURY, P FREEMAN, SJ LISTER, CJ CARPENTER, MP HENRY, RG JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y SORAMEL, F BEARDEN, IG TI NOVEL DECAY MODES OF HIGH-K ISOMERS - TUNNELING IN A TRIAXIAL LANDSCAPE SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-SPIN ISOMERS; BARRIER PENETRATION; OS-NUCLEI; COMPETITION; STATES AB The nucleus W-176 has been studied using the reaction Nd-150(Si-30,4n), with prompt and delayed gamma-gamma coincidence techniques. A K = 14 isomer (t(1/2) approximate to 70 ns) is found to exhibit a unique decay pattern, primarily decaying to K = 0 states, in contrast to all previously studied high-K isomers. Calculations have been performed of both Coriolis mixing and tunneling through a potential barrier in the triaxial degree of freedom to understand these unusual decays. While Coriolis mixing models do not reproduce the variations in the decay patterns in neighboring nuclei, the tunneling calculations are remarkably successful. C1 YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. PURDUE UNIV,W LAFAYETTE,IN 47907. RP CROWELL, B (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Freeman, Sean/B-1280-2010; Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Freeman, Sean/0000-0001-9773-4921; Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 13 TC 34 Z9 34 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 FEB 21 PY 1994 VL 72 IS 8 BP 1164 EP 1167 DI 10.1103/PhysRevLett.72.1164 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300008 ER PT J AU TIOURIRINE, TN TURNER, L LAU, AWC AF TIOURIRINE, TN TURNER, L LAU, AWC TI MULTIPOLE TRAPS FOR NONNEUTRAL PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NONNEUTRAL PLASMA AB A multipolar generalization of the Penning trap is presented. The case of l=1 is that of standard Penning trap. For the case of a quadrupolar magnetic field, analytic solutions ate presented for cold, confined, one-species plasmas with spheroidal or spherical boundaries; for higher I values, analytic solutions are given only for spherically bounded plasmas. By virtue of the sheared Flow present for solutions with l > 1, the classical Brillouin ratio (stored rest energy of particles/stored magnetic energy) of unity is exceeded and attains a global limit of 2 at infinitely high l. RP TIOURIRINE, TN (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 12 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 21 PY 1994 VL 72 IS 8 BP 1204 EP 1207 DI 10.1103/PhysRevLett.72.1204 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300018 ER PT J AU KESSEL, C MANICKAM, J REWOLDT, G TANG, WM AF KESSEL, C MANICKAM, J REWOLDT, G TANG, WM TI IMPROVED PLASMA PERFORMANCE IN TOKAMAKS WITH NEGATIVE MAGNETIC SHEAR SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSPORT AB A tokamak plasma configuration is reported that simultaneously improves on the maximum stable plasma pressure, the bootstrap current contribution, and kinetic stability to temperature and density gradient driven modes in toroidal geometry. It is characterized by negative magnetic shear in the plasma interior and a peaked pressure profile. Stability to the ideal low-n external kink modes requires a conducting shell at 1.3 times the plasma minor radius. This novel plasma configuration is promising for improved plasma performance in advanced tokamak experiments. RP KESSEL, C (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 15 TC 331 Z9 331 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 21 PY 1994 VL 72 IS 8 BP 1212 EP 1215 DI 10.1103/PhysRevLett.72.1212 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300020 ER PT J AU WELLER, A SPONG, DA JAENICKE, R LAZAROS, A PENNINGSFELD, FP SATTLER, S AF WELLER, A SPONG, DA JAENICKE, R LAZAROS, A PENNINGSFELD, FP SATTLER, S TI NEUTRAL BEAM DRIVEN GLOBAL ALFVEN EIGENMODES IN THE WENDELSTEIN W7-AS STELLARATOR SO PHYSICAL REVIEW LETTERS LA English DT Article ID FUSION ALPHA-PARTICLES; TOKAMAK PLASMA; IGNITED TOKAMAK; TOROIDICITY; EXCITATION; SPECTRUM; WAVE; DESTABILIZATION; INSTABILITIES; MODES AB During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium beta, which is driven by the energetic beam particles. An interpretation is given in terms of marginally stable global Alfven eigenmodes (GAE), which are destabilized by Landau resonances of the fast circulating particles. Toroidicity induced gaps for toroidal Alfven eigenmodes do not occur in W7-AS, but GAE modes in gaps below the shear Alfven continua can be excited. This is investigated within a gyrofluid model, which has been used successfully for tokamak cases previously. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WELLER, A (reprint author), EURATOM,MAX PLANCK INST PLASMAPHYS,D-85740 GARCHING,GERMANY. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 26 TC 60 Z9 60 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 21 PY 1994 VL 72 IS 8 BP 1220 EP 1223 DI 10.1103/PhysRevLett.72.1220 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300022 ER PT J AU HOFFMANN, FM PERSSON, BNJ WALTER, W KING, DA HIRSCHMUGL, CJ WILLIAMS, GP AF HOFFMANN, FM PERSSON, BNJ WALTER, W KING, DA HIRSCHMUGL, CJ WILLIAMS, GP TI ANTIABSORPTION RESONANCES IN INFRARED REFLECTANCE SPECTROSCOPY OF ALKALI-CU(111) ADSORBATE SYSTEMS - IS THE GROUND-STATE A SURFACE-CHARGE DENSITY WAVE CONDENSATE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; BAND-STRUCTURE; POTASSIUM; CU(111); CU(100); COPPER; LAYER; NA AB We have observed antiabsorption resonances when alkali metals are adsorbed on Cu(111), The resonances occur at h omega(0) approximate to 0.1 eV and cannot be attributed to phonon modes. We show that the experimental data can be consistently explained by attributing the resonances to vibrations, parallel to the surface, of a pinned surface charge density wave (CDW). We estimate the CDW effective mass to be m* approximate to 500m(e) per electron in the condensate. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY. UNIV CAMBRIDGE, DEPT CHEM, CAMBRIDGE CB2 1EW, ENGLAND. BROOKHAVEN NATL LABS, UPTON, NY 11973 USA. RP HOFFMANN, FM (reprint author), EXXON RES & ENGN CO, ANNANDALE, NJ 08801 USA. RI Persson, Bo Nils Johan/I-1548-2013 OI Persson, Bo Nils Johan/0000-0003-1535-738X NR 25 TC 22 Z9 22 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 21 PY 1994 VL 72 IS 8 BP 1256 EP 1259 DI 10.1103/PhysRevLett.72.1256 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300031 ER PT J AU MCNEIL, LE GRIMSDITCH, M AF MCNEIL, LE GRIMSDITCH, M TI NEW HIGH-PRESSURE TRANSFORMATION IN ALPHA-QUARTZ - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP MCNEIL, LE (reprint author), UNIV N CAROLINA,CHAPEL HILL,NC 27599, USA. NR 3 TC 15 Z9 15 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 21 PY 1994 VL 72 IS 8 BP 1301 EP 1301 DI 10.1103/PhysRevLett.72.1301 PG 1 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300044 ER PT J AU BEITZ, JV HINAUS, BM HUANG, J AF BEITZ, JV HINAUS, BM HUANG, J TI SIMULTANEOUS ACQUISITION OF PHOTOACOUSTIC AND FLUORESCENCE-SPECTRA AT HIGH-SENSITIVITY FROM POWDERED SAMPLES AT VARIABLE-TEMPERATURE SO APPLIED OPTICS LA English DT Article DE PHOTOACOUSTIC SPECTROSCOPY; LASER-INDUCED FLUORESCENCE; RARE-EARTH OXIDE ID OPTOACOUSTIC SPECTROSCOPY; ACTINIDE OXIDES; ND2O3 AB An apparatus has been built for simultaneous high-sensitivity photoacoustic and fluorescence studies at temperatures from 4 to 295 K that uses a pulsed tunable dye laser as the excitation light source. A powdered sample, pressed into the pellet, is attached to a coiled fused-silica rod that provides thermal isolation from and good acoustic contact to an ambient temperature acoustic detector. The surface of the rod is roughened, thereby eliminating acoustic interference arising from scattered excitation light. As a test of the apparatus, the absorption spectrum of the (F9/2)-F-4 state of Nd3+ in A-phase Nd2O3 powder, dispersed in a KBr pellet, was recorded simultaneously by means of photoacoustic and fluorescence excitation spectroscopies. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. UNIV WISCONSIN EAU CLAIRE, EAU CLAIRE, WI 54702 USA. NR 22 TC 3 Z9 3 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 FEB 20 PY 1994 VL 33 IS 6 BP 921 EP 929 PG 9 WC Optics SC Optics GA NA381 UT WOS:A1994NA38100002 PM 20862091 ER PT J AU GRISCOM, DL GINGERICH, ME FRIEBELE, EJ PUTNAM, M UNRUH, W AF GRISCOM, DL GINGERICH, ME FRIEBELE, EJ PUTNAM, M UNRUH, W TI FAST-NEUTRON RADIATION EFFECTS IN A SILICA-CORE OPTICAL-FIBER STUDIED BY A CCD-CAMERA SPECTROMETER SO APPLIED OPTICS LA English DT Article DE FIBER OPTICS; RADIATION EFFECTS; FAST-NEUTRON DAMAGE; CCD-CAMERA SPECTROPHOTOMETER ID WAVEGUIDES; ABSORPTION; GLASS; CENTERS AB A simple CCD-camera spectrometer was deployed at the Los Alamos Spallation Radiation Effects Facility to characterize fast-neutron irradiation effects in several silica-based optical fibers over the wavelength range approximately 450-1100 nm. The experimental arrangement allowed optical loss spectra to be developed from remotely recovered frame grabs at various times during irradiation without it being necessary to resort to cutback methods. Data recorded for a pure-silica-core/F-doped-silica-clad fiber displayed a peculiar artifact, which is described and mathematically modeled in terms of leaky modes propagating in an optical cladding that is substantially less susceptible to radiation-induced optical attenuation than is the core. Evidence from optical time-domain reflectometry supports the postulate that mode leakage into the cladding may be a result of light scattering from the tracks of ions displaced by the 14-MeV neutrons. These results suggest that fibers with fluorine doping in the core, as well as in the cladding, would be relatively resistant to radiation-induced attenuation in the UV-visible spectral region. C1 VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP GRISCOM, DL (reprint author), USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. NR 21 TC 9 Z9 9 U1 2 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1994 VL 33 IS 6 BP 1022 EP 1028 PG 7 WC Optics SC Optics GA NA381 UT WOS:A1994NA38100021 PM 20862110 ER PT J AU GODWIN, RP AF GODWIN, RP TI FRESNEL ABSORPTION, RESONANCE-ABSORPTION, AND X-RAYS IN LASER-PRODUCED PLASMAS SO APPLIED OPTICS LA English DT Article DE LASER-PLASMA INTERACTIONS; LASER-PLASMA REFLECTANCE; FRESNEL EQUATIONS; RESONANCE ABSORPTION; X-RAY PRODUCTION ID HIGH-DENSITY PLASMA; FEMTOSECOND LASER; LIGHT-ABSORPTION; PULSES AB Assuming Fresnel absorption for s-polarized light and resonance absorption for p-polarized light provides agreement with the significant features of subpicosecond high-intensity KrF laser-produced plasma experiments. These features include the s- and p-light angular dependence and magnitude of the reflectance. Dramatic differences exist in the threshold for emission of x-ray photons above 0.5 keV, the x-ray emission intensity, and the efficiency for x-ray production by absorbed p and s light. It is shown that resonant p-light absorption occurs at the laser critical density and that the s-light absorption at a higher electron density causes more efficient x-ray production by p light than by s light. RP GODWIN, RP (reprint author), LOS ALAMOS NATL LAB, DIV APPL THEORET PHYS, HYDRODYNAM APPLICAT GRP, POB 1663, LOS ALAMOS, NM 87545 USA. NR 22 TC 10 Z9 10 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 FEB 20 PY 1994 VL 33 IS 6 BP 1063 EP 1069 PG 7 WC Optics SC Optics GA NA381 UT WOS:A1994NA38100028 PM 20862117 ER PT J AU JEDAMZIK, K FULLER, GM MATHEWS, GJ KAJINO, T AF JEDAMZIK, K FULLER, GM MATHEWS, GJ KAJINO, T TI ENHANCED HEAVY-ELEMENT FORMATION IN BARYON-INHOMOGENEOUS BIG-BANG MODELS SO ASTROPHYSICAL JOURNAL LA English DT Article DE EARLY UNIVERSE; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID HADRON PHASE-TRANSITION; PRIMORDIAL NUCLEOSYNTHESIS; EARLY UNIVERSE; NEUTRON DIFFUSION; STRANGE MATTER; NUMBER FLUCTUATIONS; BE-9; QCD; CONDENSATION; GENERATION AB We show that primordial nucleosynthesis in baryon-inhomogeneous big-bang models can lead to significant heavy-element production while still satisfying all of the light-element abundance constraints including the low lithium abundance observed in Population 11 stars. The parameters which admit this solution arise naturally from the process of neutrino-induced expansion of baryon inhomogeneities prior to the epoch of nucleosynthesis. These solutions entail a small fraction of baryons (less than or similar to 2%) in very high density regions with local baryon to photon ratio eta(h) congruent-to 10(-4), while most baryons are at a baryon-to-photon ratio which optimizes the agreement with light-element abundances. This model would imply a unique signature of baryon inhomogeneities in the early universe, evidenced by the existence of primordial material containing heavy-element products of proton and alpha-burning reactions with an abundance of [Z] approximately -6 to -4. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NATL ASTRON OBSERV,DIV THEORET ASTROPHYS,MITANA,TOKYO 118,JAPAN. RP JEDAMZIK, K (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 55 TC 33 Z9 33 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 FEB 20 PY 1994 VL 422 IS 2 BP 423 EP 429 DI 10.1086/173738 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ636 UT WOS:A1994MZ63600001 ER PT J AU STOMPOR, R GORSKI, KM AF STOMPOR, R GORSKI, KM TI COSMIC MICROWAVE BACKGROUND ANISOTROPIES IN COLD DARK-MATTER MODELS WITH COSMOLOGICAL CONSTANT - THE INTERMEDIATE VERSUS LARGE ANGULAR SCALES SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND ID RADIATION AB We obtain predictions for cosmic microwave background anisotropies at angular scales near 1-degrees in the context of cold dark matter models with a nonzero cosmological constant, normalized to the COBE-DMR detection. The results are compared to those computed in the matter-dominated models. We show that the coherence length of the CMB anisotropy is almost insensitive to cosmological parameters, and the rms amplitude of the anisotropy increases moderately with decreasing total matter density, while being most sensitive to the baryon abundance. We apply these results in the statistical analysis of the published data from the UCSB South Pole (SP) experiment (Gaier et al. 1992; Schuster et al. 1993). We reject most of the CDM-LAMBDA models at the 95% confidence level when both SP scans are simulated together (although the combined data set renders less stringent limits than the Gaier et al. data alone). However, the Schuster et al. data considered alone, as well as the results of some other recent experiments (MAX, MSAM, Saskatoon), suggest that typical temperature fluctuations on degree scales may be larger than is indicated by the Gaier et al. scan. If so, CDM-LAMBDA models may indeed provide, from the point of view of CMB anisotropies, an acceptable alternative to flat CDM models. C1 NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. RP STOMPOR, R (reprint author), LOS ALAMOS NATL LAB,THEORET ASTROPHYS GRP,T-6,MS B288,LOS ALAMOS,NM 87545, USA. NR 16 TC 9 Z9 9 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 FEB 20 PY 1994 VL 422 IS 2 BP L41 EP L44 DI 10.1086/187207 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ637 UT WOS:A1994MZ63700003 ER PT J AU SWENSON, FJ FAULKNER, J IGLESIAS, CA ROGERS, FJ ALEXANDER, DR AF SWENSON, FJ FAULKNER, J IGLESIAS, CA ROGERS, FJ ALEXANDER, DR TI THE CLASSICAL HYADES LITHIUM PROBLEM RESOLVED SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; OPEN CLUSTERS AND ASSOCIATIONS, INDIVIDUAL (HYADES); STARS, ABUNDANCES; STARS, EVOLUTION; STARS, INTERIORS ID ABUNDANCE; CLUSTER; OPACITY AB Recent observations of Hyades stars indicate an enhanced oxygen-to-iron ratio in comparison to the Sun. We show that the impact of such an oxygen enhancement on the predictions of pre-main-sequence lithium burning, via interior opacities, is quite substantial. For the first time, self-consistent predictions of the G and K dwarf (Li, T(eff)) relationship for the Hyades match the observations. Other elements which could be of importance in this regard, for any cluster, are also identified. C1 UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. WICHITA STATE UNIV,DEPT PHYS,WICHITA,KS 67208. RP SWENSON, FJ (reprint author), UNIV VICTORIA,DEPT PHYS & ASTROM,VICTORIA V8W 3P6,BC,CANADA. NR 22 TC 32 Z9 32 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 FEB 20 PY 1994 VL 422 IS 2 BP L79 EP L82 DI 10.1086/187217 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ637 UT WOS:A1994MZ63700013 ER PT J AU JEPHCOAT, AP HRILJAC, JA FINGER, LW COX, DE AF JEPHCOAT, AP HRILJAC, JA FINGER, LW COX, DE TI PRESSURE-INDUCED ORIENTATIONAL ORDER IN C60 AT 300-K SO EUROPHYSICS LETTERS LA English DT Article ID SOLID C-60; PHASE-TRANSITION; X-RAY; CRYSTAL-STRUCTURE; FULLERENES; CARBON; STATE; TEMPERATURE; DEPENDENCE AB The pressure dependence of the structure of the pure fullerene C60 has been studied by high-resolution synchrotron X-ray powder diffraction at 300 K in a diamond-anvil cell with fluid helium as a pressure-transmitting medium. Reflections corresponding to the simple cubic (s.c.) phase of C60 are identified at 2.5 GPa. The powder data agree well with calculated profiles for an ordered structure based on Pa3BAR symmetry and are consistent with a long-range orientational ordering transition under pressure identical to that occurring at 255 K and ambient pressure; the onset of the transition occurs below 0.5 GPa. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. CARNEGIE INST WASHINGTON, GEOPHYS LAB, WASHINGTON, DC 20015 USA. CARNEGIE INST WASHINGTON, CTR HIGH PRESSURE RES, WASHINGTON, DC 20015 USA. RP JEPHCOAT, AP (reprint author), UNIV OXFORD, DEPT EARTH SCI, PARKS RD, OXFORD OX1 3PR, ENGLAND. NR 33 TC 20 Z9 20 U1 0 U2 5 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD FEB 20 PY 1994 VL 25 IS 6 BP 429 EP 434 DI 10.1209/0295-5075/25/6/006 PG 6 WC Physics, Multidisciplinary SC Physics GA NA437 UT WOS:A1994NA43700006 ER PT J AU KLEINMAN, L LEE, YN SPRINGSTON, SR NUNNERMACKER, L ZHOU, XL BROWN, R HALLOCK, K KLOTZ, P LEAHY, D LEE, JH NEWMAN, L AF KLEINMAN, L LEE, YN SPRINGSTON, SR NUNNERMACKER, L ZHOU, XL BROWN, R HALLOCK, K KLOTZ, P LEAHY, D LEE, JH NEWMAN, L TI OZONE FORMATION AT A RURAL SITE IN THE SOUTHEASTERN UNITED-STATES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID AIR; HYDROCARBONS; SENSITIVITY; DEPENDENCE; ATMOSPHERE; MODEL AB Trace gas measurements pertinent to understanding the transport and photochemical formation Of O3 were made at a surface site in rural Georgia as part of the Southern Oxidant Study during the summer of 1991. It was found that there was a strong correlation between O3 and the oxidation products of NO(x): O3(ppb) = 27 + 11.4 (NO(y)(ppb) - NO(x)(ppb)), r2 = 0.78. This fit is similar to that observed at other rural sites in eastern North America and indicates a nominal background O3 level of 27 ppb; values higher than 27 ppb are due to photochemical production in the recent past, which varied from near zero to almost-equal-to 50 ppb. The origin of the O3 above background was investigated by using a free radical budget equation to calculate an in SitU O3 production rate in terms of measured concentrations of NO and free radical precursors (O3, HCHO, peroxides, and other carbonyls). A comparison of observed and predicted diurnal trends in O3 indicates significant O3 production in the afternoon at a time when O3 concentration is either steady or decreasing. The afternoon near-surface layer is thereby a source region for O3 which can be exported. In situ production accounts for approximately one half of the morning increase in O3 concentration on days with high O3; the remainder is due to entrainment of dirty air aloft by the growing convective boundary layer. Additional evidence for the role of vertical transport in controlling the hour-to-hour changes in O3 is found in the diurnal cycles Of SO2 and HNO3 which also have rapid increases in the morning. The day-to-day variability Of O3 was investigated using a back trajectory model. NO(y) concentration at the measurement site could be reasonably accounted for by considering NO(x) emission sources located within 1-day transport distance. In as much as there is a strong correlation between O3 and NO(y) the coincidence between trajectory location and NO(x) emission sources appears to be an important factor influencing midday O3 concentration. Hydrocarbon measurements are consistent with NO(x) being the limiting factor for formation Of O3. RP KLEINMAN, L (reprint author), BROOKHAVEN NATL LAB, DEPT APPL SCI, DIV ENVIRONM CHEM, UPTON, NY 11973 USA. NR 38 TC 141 Z9 145 U1 1 U2 16 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 FEB 20 PY 1994 VL 99 IS D2 BP 3469 EP 3482 DI 10.1029/93JD02991 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MY580 UT WOS:A1994MY58000004 ER PT J AU ELLIOTT, S CICERONE, RJ TURCO, RP DRDLA, K TABAZADEH, A AF ELLIOTT, S CICERONE, RJ TURCO, RP DRDLA, K TABAZADEH, A TI INFLUENCE OF THE HETEROGENEOUS REACTION HCL+HOCL ON AN OZONE HOLE MODEL WITH HYDROCARBON ADDITIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID POLAR STRATOSPHERIC CLOUDS; BALLOON-BORNE MEASUREMENTS; PEROXYACETYL NITRATE PAN; NITRIC-ACID TRIHYDRATE; ANTARCTIC OZONE; TRACE GASES; MCMURDO STATION; ATMOSPHERIC CHEMISTRY; SAM-II; NITROGEN AB Injection of ethane or propane has been suggested as a means for reducing ozone loss within the Antarctic vortex because alkanes can convert active chlorine radicals into hydrochloric acid. In kinetic models of vortex chemistry including as heterogeneous processes only the hydrolysis and HCI reactions of ClONO2 and N2O5, parts per billion by volume levels of the light alkanes counteract ozone depletion by sequestering chlorine atoms. Introduction of the surface reaction of HCl with HOCl causes ethane to deepen baseline ozone holes and generally works to impede any mitigation by hydrocarbons. The increased depletion occurs because HCl + HOCl can be driven by HO(x) radicals released during organic oxidation. Following initial hydrogen abstraction by chlorine, alkane breakdown leads to a net hydrochloric acid activation as the remaining hydrogen atoms enter the photochemical system. Lowering the rate constant for reactions of organic peroxy radicals with CIO to 10(-13) cm3 molecule-1 s-1 does not alter results, and the major conclusions are insensitive to the timing of the ethane additions. Ignoring the organic peroxy radical plus ClO reactions entirely restores remediation capabilities by allowing HO(x) removal independent of HCI. Remediation also returns if early evaporation of polar stratospheric clouds leaves hydrogen atoms trapped in aldehyde intermediates, but real ozone losses are small in such cases. C1 UNIV CALIF IRVINE, DEPT GEOSCI, IRVINE, CA 92717 USA. UNIV CALIF LOS ANGELES, DEPT ATMOSPHER SCI, LOS ANGELES, CA 90024 USA. RP ELLIOTT, S (reprint author), LOS ALAMOS NATL LAB, INST GEOPHYS & PLANETARY PHYS, LOS ALAMOS, NM 87544 USA. NR 95 TC 7 Z9 7 U1 0 U2 2 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 FEB 20 PY 1994 VL 99 IS D2 BP 3497 EP 3508 DI 10.1029/93JD03089 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MY580 UT WOS:A1994MY58000006 ER PT J AU LEE, YN ZHOU, XL AF LEE, YN ZHOU, XL TI AQUEOUS REACTION-KINETICS OF OZONE AND DIMETHYLSULFIDE AND ITS ATMOSPHERIC IMPLICATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID BIOGENIC SULFUR; NITROGEN-DIOXIDE; CLOUD ALBEDO; LIQUID WATER; MARINE AIR; SULFIDE; MECHANISM; OCEAN; PHYTOPLANKTON; OXIDATION AB In order to understand and predict the budgets and distributions of ozone (O3) and dimethylsulfide (DMS) in the marine atmosphere, it is necessary to determine the rates of aqueous reactions in clouds and surface water that may influence the lifetimes of these species. We studied the kinetics of the aqueous phase reaction Of O3 and DMS in the laboratory using a bubbler-type gas-liquid reactor at sub-parts-per-billion (ppb) gas phase concentrations. The steady state reaction rate was determined from the decrease of gas phase DMS concentration in the effluent gas as ozone was simultaneously added. The reaction stoichiometry was found to be 1:1 with respect to the two reagents. Fitting the data to a kinetics scheme appropriate for a gas-liquid reaction in the slow reaction regime where the reaction rate is governed by both chemical reaction and convective mass transfer, we determined an intrinsic second-order aqueous rate coefficient Of O3-DMS reaction of 4 x 10(8) (+/-40%) M-1 s-1 at 15.0-degrees-C. The implications of this reaction include (1) the atmospheric lifetime of DMS against in-cloud O3-DMS reaction at 30 ppb Of O3 and 1 g m-3 liquid water concentration is calculated to be approximately 3 days and is comparable to that against the gas phase reaction with OH radicals at 1 X 10(6) molecules CM-3; (2) the deposition of atmospheric O3 to the ocean surface is only slightly enhanced by the O3-DMS reaction at the highest reported surface DMS concentrations, (approximately 40 nM); and (3) the sea to air flux of DMS is not affected by this reaction at O3 Concentrations typical of the marine atmosphere. RP LEE, YN (reprint author), BROOKHAVEN NATL LAB, DEPT APPL SCI, DIV ENVIRONM CHEM, POB 5000, UPTON, NY 11973 USA. NR 43 TC 39 Z9 40 U1 0 U2 16 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 FEB 20 PY 1994 VL 99 IS D2 BP 3597 EP 3605 DI 10.1029/93JD02919 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MY580 UT WOS:A1994MY58000013 ER PT J AU AHLUWALIA, DV JOHNSON, MB GOLDMAN, T AF AHLUWALIA, DV JOHNSON, MB GOLDMAN, T TI MAJORANA-LIKE (J,0)CIRCLE-PLUS(0,J) REPRESENTATION SPACES - CONSTRUCTION AND PHYSICAL INTERPRETATION SO MODERN PHYSICS LETTERS A LA English DT Article ID DOUBLE BETA-DECAY; ARBITRARY-SPIN; ELECTROMAGNETIC PROPERTIES; KINEMATIC ACAUSALITY; ELECTRIC CHARGE; NEUTRINO; PARTICLES; QUANTIZATION; CONSTRAINTS; FORMALISM AB We present a formalism that extends the Majorana-construction to arbitrary spin (j,O) + (O,j) representation spaces. For the example case of spin-one, a wave equation satisfied by the Majorana-like (1,O) + (O,1) spinors is constructed and its physical content explored. The (j,O) + (O,j) Majorana-construct is found to possess an unusual classical and quantum field theoretic structure. Relevance of our formalism to parity violation, hadronic phenomenologies, and grand unified field theories is briefly pointed out. RP AHLUWALIA, DV (reprint author), LOS ALAMOS NATL LAB,MP-9,MS H-846,LOS ALAMOS,NM 87545, USA. NR 47 TC 15 Z9 15 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD FEB 20 PY 1994 VL 9 IS 5 BP 439 EP 450 DI 10.1142/S0217732394000460 PG 12 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA NC993 UT WOS:A1994NC99300008 ER PT J AU HUNTER, BA JORGENSEN, JD WAGNER, JL RADAELLI, PG HINKS, DG SHAKED, H HITTERMAN, RL VONDREELE, RB AF HUNTER, BA JORGENSEN, JD WAGNER, JL RADAELLI, PG HINKS, DG SHAKED, H HITTERMAN, RL VONDREELE, RB TI PRESSURE-INDUCED STRUCTURAL-CHANGES IN SUPERCONDUCTING HGBA2CAN-1CUNO2N+2+DELTA (N = 1, 2, 3) COMPOUNDS SO PHYSICA C LA English DT Article ID TRANSITION-TEMPERATURE; CHARGE-TRANSFER; OXYGEN-CONTENT; DEPENDENCE; TC; YBA2CU3O7-X; YBA2CU4O8; STATE AB The crystal structures of superconducting HgBa2CuO4+delta and HgBa2CaCu2O6+delta have been investigated with a pressure up to 0.6 GPa and HgBa2Ca2Cu3O8+delta to 9.2 GPa by neutron powder diffraction. The compressibility along the c-axis is nearly the same for the three compounds and up to two times larger than the compressibility along the a-axis. The one-layer compound, HgBa2CuO4+delta, shows the largest a-axis compressibility, while HgBa2Ca2Cu3O4+delta shows the smallest compressibility. The bond compressibilities of HgBa2CuO4+delta and HgBa2CaCu2O6+delta are significantly different from HgBa2Ca2Cu3O8+delta bond compressibilities. In the one- and two-layer compounds the largest bond compressibility was the Cu-O2 (apical) bond distance, while for the three-layer compound it was the Hg-O2 bond distance. C1 NUCL RES CTR NEGEV,DEPT PHYS,IL-84190 BEER SHEVA,ISRAEL. BEN GURION UNIV NEGEV,DEPT PHYS,IL-84105 BEER SHEVA,ISRAEL. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. RP HUNTER, BA (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 48 TC 128 Z9 128 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD FEB 20 PY 1994 VL 221 IS 1-2 BP 1 EP 10 DI 10.1016/0921-4534(94)90659-9 PG 10 WC Physics, Applied SC Physics GA MZ390 UT WOS:A1994MZ39000001 ER PT J AU SMITH, MG TAYLOR, RD NEUMEIER, JJ THOMPSON, JD AF SMITH, MG TAYLOR, RD NEUMEIER, JJ THOMPSON, JD TI DECREASE OF FE MAGNETIC-ORDERING TEMPERATURE IN YSR2CU2FEO6+X THROUGH SYNTHESIS SO PHYSICA C LA English DT Article ID FERMI-LIQUID THEORY; NORMAL-STATE; NMR EXPERIMENTS; YBA2CU3O7; SUSCEPTIBILITY; NUCLEAR; TC; SUPERCONDUCTIVITY; POWDER AB The effect of synthesis on the structural and magnetic properties of YSr2Cu2FeO6+x has been investigated. Materials were prepared by bulk solid-state oxidizing (method [O]) and reduction (method [NO]) reactions, and by sol-gel solution (method [S]) synthesis. Materials were characterized by X-ray powder diffraction, iodometric titration, magnetic susceptibility, and Fe-57 Mossbauer absorption spectroscopy. We observe a decrease in the magnetic-ordering temperature T(m) from T(m) almost-equal-to 65 K (method [O]) to T(m) almost-equal-to 61 K (method [S]) and T(m) almost-equal-to 44 K (method [NO]) even though the Fe occupancy of the Cu(2) site increases in going from method [O] to [S] and [NO]. We interpret the decrease of T(m) to be due to an increase in hole transfer from the Cu(1)O(x) planes to Cu(2)O2 sheets. The degree of hole transfer is increased by a decrease in the crystallographic a-axis and in the ratio 3a/c of the lattice parameters, and is modulated by the local Fe-oxygen coordination and oxygen disorder in the Cu(1)O(x) planes. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. RP SMITH, MG (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 22 TC 3 Z9 3 U1 1 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 FEB 20 PY 1994 VL 221 IS 1-2 BP 187 EP 194 DI 10.1016/0921-4534(94)90682-3 PG 8 WC Physics, Applied SC Physics GA MZ390 UT WOS:A1994MZ39000024 ER PT J AU MATERER, N BARBIERI, A GARDIN, D STARKE, U BATTEAS, JD VANHOVE, MA SOMORJAI, GA AF MATERER, N BARBIERI, A GARDIN, D STARKE, U BATTEAS, JD VANHOVE, MA SOMORJAI, GA TI DYNAMICAL LEED ANALYSES OF THE PT(111)-P(2X2)-NO AND THE NI(111)-C(4X2)-2NO STRUCTURES - SUBSTRATE RELAXATION AND UNEXPECTED HOLLOW-SITE ADSORPTION SO SURFACE SCIENCE LA English DT Article ID ENERGY-ELECTRON-DIFFRACTION; SURFACE-STRUCTURE; NO ADSORPTION; NITRIC-OXIDE; SPECTROSCOPY; HREELS; ABSORPTION; REACTIVITY; STATES; CO AB Dynamical LEED analyses of ordered structures of NO molecules chemisorbed on Pt(111) and on Ni(111) conclusively yield threefold-coordinated hollow-site adsorption and reasonable bond lengths. Both metal surfaces exhibit molecular induced substrate relaxations; those in Ni(111) are greater than those in Pt(111). The Pt(111)-p(2 X 2)-NO structure has NO adsorbed in a threefold fcc site with a small buckling of the first metal layer. NO of the Ni(111)-c(4 X 2)-2NO structure is adsorbed in threefold fcc and hcp sites with a 0.16 angstrom buckling of the first metal layer. The hollow-site adsorption on both metal surfaces invalidates long-standing bridge and top-site assignments based on vibrational spectroscopy measurements, calling that approach into question. The threefold hollow-site adsorption determined for these systems also contrasts with the lower coordinated bridge and top sites generally found for CO molecules on the same metal surfaces. C1 LAWRENCE BERKELEY LAB,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 50 TC 96 Z9 96 U1 1 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 20 PY 1994 VL 303 IS 3 BP 319 EP 332 DI 10.1016/0039-6028(94)90779-X PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NA606 UT WOS:A1994NA60600008 ER PT J AU RODRIGUEZ, JA AF RODRIGUEZ, JA TI METAL-METAL BONDING ON SURFACES - MOLECULAR-ORBITAL STUDY OF PD/TI(001) AND PD/RU(001) SO SURFACE SCIENCE LA English DT Review ID BINDING-ENERGY SHIFTS; ULTRATHIN PD LAYERS; TRANSITION-METAL; ELECTRONIC-STRUCTURE; CO CHEMISORPTION; INTERMETALLIC COMPOUNDS; INTERMEDIATE NEGLECT; BIMETALLIC SURFACES; THERMAL-DESORPTION; RU(0001) SURFACE AB The interaction of a Pd atom with Ti(001), Ru(001) and Pd(111) surfaces has been studied using semiempirical MO-SCF calculations (INDO/1) and cluster models. In addition, the electronic properties of the diatomic PdTi, PdRu and Pd, molecules have been examined using ab initio SCF calculations. The results of the calculations indicate that the charge transfer in the Pd-Ti and Pd-Ru bonds is small. For supported Pd monolayers, the Pd-substrate bonds can be described as mainly metallic, with a small degree of ionic character. Adsorption of Pd on an early transition metal induces a reduction in the electron population of the Pd(4d) orbitals by: (1) charge transfer from Pd to the metal substrate, and (2) rehybridization of the Pd(4d,5s,5p) levels. The magnitude of both phenomena increases when the fraction of empty orbitals in the valence band of the metal substrate rises. The Pd(4d) --> Pd(5s,5p) electron transfer plays an important role in the strength of the bimetallic bonds: the larger this rehybridization, the stronger the Pd-substrate bond. Electronic perturbations induced by Ti or Ru on Pd reduce the CO-chemisorption ability of Pd by weakening simultaneously the Pd(4d)-CO(2pi*) and Pd(5s,5p)-CO(5sigma) bonding interactions. For adsorption of CO on supported Pd, the pi back-donation and strength of the Pd-CO bond decrease when the fraction of empty states in the valence band of the support increases. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,POB 5000,UPTON,NY 11973, USA. NR 113 TC 36 Z9 36 U1 3 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 20 PY 1994 VL 303 IS 3 BP 366 EP 376 DI 10.1016/0039-6028(94)90784-6 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NA606 UT WOS:A1994NA60600013 ER PT J AU BOESE, R BLASER, D BILLUPS, WE HALEY, MM MAULITZ, AH MOHLER, DL VOLLHARDT, KPC AF BOESE, R BLASER, D BILLUPS, WE HALEY, MM MAULITZ, AH MOHLER, DL VOLLHARDT, KPC TI THE EFFECT OF FUSION OF ANGULAR STRAINED RINGS ON BENZENE - CRYSTAL-STRUCTURES OF 1,2-DIHYDROCYCLOBUTA[A]CYCLOPROPA[C]-, 1,2,3,4-TETRAHYDRODICYCLOBUTA[A,C]-, 1,2,3,4-TETRAHYDRODICYCLOBUTA[A,C]CYCLOPROPA[E]-, AND 1,2,3,4,5,6-HEXAHYDROTRICYCLOBUTA[A,C,E]BENZENE SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID DEFORMATION ELECTRON-DENSITIES; CYCLOHEXATRIENE RING; MOLECULAR-STRUCTURE; AROMATIC SYSTEMS; TRIS(BENZOCYCLOBUTADIENO)BENZENE; SPECTRA; PI C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RICE UNIV,DEPT CHEM,HOUSTON,TX 77251. UNIV GESAMTHSCH ESSEN,INST ANORGAN CHEM,D-45117 ESSEN,GERMANY. RP BOESE, R (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 40 TC 71 Z9 71 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD FEB 18 PY 1994 VL 33 IS 3 BP 313 EP 317 DI 10.1002/anie.199403131 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA MX732 UT WOS:A1994MX73200008 ER PT J AU YU, JH HSIEH, LC KOCHERSPERGER, L YONKOVICH, S STEPHANS, JC GALLOP, MA SCHULTZ, PG AF YU, JH HSIEH, LC KOCHERSPERGER, L YONKOVICH, S STEPHANS, JC GALLOP, MA SCHULTZ, PG TI PROGRESS TOWARD AN ANTIBODY GLYCOSIDASE SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID HYDROLYSIS; INHIBITION; LYSOZYME; BINDING; ASSAY C1 AFFYMAX RES INST,PALO ALTO,CA 94304. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 26 TC 31 Z9 31 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD FEB 18 PY 1994 VL 33 IS 3 BP 339 EP 341 DI 10.1002/anie.199403391 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA MX732 UT WOS:A1994MX73200019 ER PT J AU OCHSENBEIN, P AYOUGOU, K MANDON, D FISCHER, J WEISS, R AUSTIN, RN JAYARAJ, K GOLD, A TERNER, J FAJER, J AF OCHSENBEIN, P AYOUGOU, K MANDON, D FISCHER, J WEISS, R AUSTIN, RN JAYARAJ, K GOLD, A TERNER, J FAJER, J TI CONFORMATIONAL EFFECTS ON THE REDOX POTENTIALS OF TETRAARYLPORPHYRINS HALOGENATED AT THE BETA-PYRROLE POSITIONS SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID SUBSTITUENTS; PORPHYRINS C1 UNIV LOUIS PASTEUR,INST LE BEL,CRISTALLOCHIM & CHIM STRUCT LAB,UA 424,F-67070 STRASBOURG,FRANCE. UNIV N CAROLINA,DEPT ENVIRONM SCI & ENGN,CHAPEL HILL,NC 27599. VIRGINIA COMMONWEALTH UNIV,DEPT CHEM,RICHMOND,VA 23284. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NR 7 TC 112 Z9 112 U1 2 U2 3 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD FEB 18 PY 1994 VL 33 IS 3 BP 348 EP 350 DI 10.1002/anie.199403481 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA MX732 UT WOS:A1994MX73200023 ER PT J AU TERWILLIGER, TC ZABIN, HB HORVATH, MP SANDBERG, WS SCHLUNK, PM AF TERWILLIGER, TC ZABIN, HB HORVATH, MP SANDBERG, WS SCHLUNK, PM TI IN-VIVO CHARACTERIZATION OF MUTANTS OF THE BACTERIOPHAGE-F1 GENE-V PROTEIN ISOLATED BY SATURATION MUTAGENESIS SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE DNA BINDING PROTEIN; F1; M13; FD; GENE V PROTEIN ID SINGLE-STRANDED-DNA; NUCLEAR MAGNETIC-RESONANCE; AMINO-ACID SUBSTITUTIONS; BINDING-PROTEIN; 5 PROTEIN; FILAMENTOUS BACTERIOPHAGE-M13; II PROTEIN; FD; POLYNUCLEOTIDES; FLUORESCENCE C1 UNIV CHICAGO,DEPT BIOCHEM & MOLEC BIOL,CHICAGO,IL 60637. RP TERWILLIGER, TC (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,MAIL STOP M880,LOS ALAMOS,NM 87545, USA. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 NR 58 TC 43 Z9 43 U1 0 U2 2 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD FEB 18 PY 1994 VL 236 IS 2 BP 556 EP 571 DI 10.1006/jmbi.1994.1165 PG 16 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MX209 UT WOS:A1994MX20900015 PM 8107140 ER PT J AU CAHN, RN JACKSON, JD QUIGG, C AF CAHN, RN JACKSON, JD QUIGG, C TI TRUTH IN SUPER COLLIDER CRITICISM SO SCIENCE LA English DT Letter C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,BATAVIA,IL 60510. RP CAHN, RN (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720, USA. NR 3 TC 1 Z9 1 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 FEB 18 PY 1994 VL 263 IS 5149 BP 902 EP 903 DI 10.1126/science.263.5149.902 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MX165 UT WOS:A1994MX16500005 PM 17758616 ER PT J AU DURBIN, MK MALIK, A GHASKADVI, R SHIH, MC ZSCHACK, P DUTTA, P AF DURBIN, MK MALIK, A GHASKADVI, R SHIH, MC ZSCHACK, P DUTTA, P TI X-RAY-DIFFRACTION STUDY OF A RECENTLY IDENTIFIED PHASE-TRANSITION IN FATTY-ACID LANGMUIR MONOLAYERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID DIAGRAM; SURFACE; WATER AB Using Brewster angle microscopy to study fatty acid Langmuir monolayers, Overbeck and Mobius (J. Phys. Chem. 1993, 97, 7 999)have observed changes of texture indicating a new phase boundary not visible in monolayer isotherms. We have studied Langmuir monolayers of CH3(CH2)(17)COOH at 30 degrees C using X-ray diffraction. We find that the monolayer undergoes a first-order phase transition from the known L(2) phase in which molecules tilt toward a nearest neighbor to a phase with tilt toward a next-nearest neighbor. Both before and after the transition, the structures are hexagonal in the plane perpendicular to the molecules. Neither the intermolecular spacing in this plane (approximate to 4.85 Angstrom, close to that seen in the Rotator II phase) nor the tilt magnitude has an observable discontinuity at this transition; only the tilt direction changes. As a result, the isotherm area/molecule is also continuous across the transition. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544. OAK RIDGE NATL LAB,DIV CERAM,OAK RIDGE,TN 37830. NR 10 TC 58 Z9 58 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 17 PY 1994 VL 98 IS 7 BP 1753 EP 1755 DI 10.1021/j100058a005 PG 3 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400005 ER PT J AU MCCLEAN, RE SIMONS, JW OLDENBORG, RC AF MCCLEAN, RE SIMONS, JW OLDENBORG, RC TI PRODUCTION AND DECAY OF PBI(G) FROM THE 308-NM PHOTODISSOCIATION OF PBI2(G) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VAPORS AB An extensive investigation of the production and decay of ground-state PbI(g) molecules from the 308-nm XeCl excimer laser photodissociation of PbI2(g) is reported. The laser fluence dependence of the PbI yield along with energetic considerations suggests that PbI is produced by a one-photon process. PbI decay profiles as a function of argon pressure, PbI2 pressure, laser fluence, and cell temperature were determined. These results suggest that PbI and the other likely photodissociation product, I, decay back to PbI2 by a complex mechanism involving an exothermic preequilibrium. We propose a complex mechanism that includes the PbI2 catalyzed recombination of PbI and I and the dimerization of PbI molecules. The proposed mechanism also takes into account the presence of Pb formed from the two-photon photodissociation of PbI2 and is capable of reproducing the observed PbI(g) and Pb(g) decay profiles under most conditions studied when: reasonable values of rate constants for the various elementary steps are used. C1 NEW MEXICO STATE UNIV,DEPT CHEM,LAS CRUCES,NM 88003. LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. NR 9 TC 0 Z9 0 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 FEB 17 PY 1994 VL 98 IS 7 BP 1864 EP 1867 DI 10.1021/j100058a024 PG 4 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400024 ER PT J AU HUANG, YH ZHU, W KOURI, DJ HOFFMAN, DK AF HUANG, YH ZHU, W KOURI, DJ HOFFMAN, DK TI DISTRIBUTED APPROXIMATING FUNCTION-APPROACH TO ATOM-DIATOM REACTIVE SCATTERING - TIME-DEPENDENT AND TIME-INDEPENDENT WAVEPACKET TREATMENTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SCHRODINGER-EQUATION; QUANTUM SCATTERING; ACCURATE; SURFACE; SYSTEMS AB The recently developed distributed approximating function (DAF) method for evaluating the action of the kinetic energy evolution operator, and the kinetic energy portion of the Hamiltonian, is applied to treat collinear reactive scattering. The DAF approach yields highly banded representations of these operators, while permitting the relevant matrix-vector multiplications to be done by fast convolution. Both time-dependent and time-independent wavepacket propagation schemes are employed, along with the DAFs, and accurate results obtained far the standard H + H-2 collinear reactive scattering system. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV,DEPT CHEM,AMES,IA. IOWA STATE UNIV,AMES LAB,AMES,IA 50011. NR 38 TC 23 Z9 23 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 FEB 17 PY 1994 VL 98 IS 7 BP 1868 EP 1874 DI 10.1021/j100058a025 PG 7 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400025 ER PT J AU GRIFFITHS, JM BELL, AT REIMER, JA AF GRIFFITHS, JM BELL, AT REIMER, JA TI MAGNETIC-RESONANCE STUDIES OF PROPENE ADSORPTION ON ALUMINA-SUPPORTED PLATINUM SURFACES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SINGLE-CRYSTAL SURFACE; METAL-SURFACES; PT(111); CATALYSTS; NMR; SPECTROSCOPY; DECOMPOSITION; PROPYLENE; SPECTRA; DESORPTION AB Carbon-13 and deuterium magnetic resonance data for propene adsorbed on high dispersion, alumina-supported platinum surfaces were obtained after adsorption at various temperatures and thermal treatments. Propene labeled with carbon-13 in the 1-position was found to scramble to the 3-position after exposure to 5% Pt/Al2O3, suggesting the formation of a short-lived propene allyl species. This species converts to a strongly adsorbed di-sigma-bonded configuration. Upon warming to 323 K, adsorbed propene is partially converted to propylidene. Our results indicate that propylidene decomposes to dehydrogenated surface carbon at elevated temperatures; neither ethylidene nor ethylidyne forms as a consequence of this decomposition. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. OI Bell, Alexis/0000-0002-5738-4645 NR 37 TC 5 Z9 5 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 FEB 17 PY 1994 VL 98 IS 7 BP 1918 EP 1925 DI 10.1021/j100058a033 PG 8 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400033 ER PT J AU ITOH, K NINOMIYA, S NISHIKAWA, M HOLROYD, RA AF ITOH, K NINOMIYA, S NISHIKAWA, M HOLROYD, RA TI CHARGE-TRANSPORT AT HIGH-PRESSURES IN TOLUENE-N-PENTANE MIXTURES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-MOBILITY; EXCESS ELECTRON; BENZENE; LIQUIDS AB The drift mobility of negative carriers in mixtures of n-pentane and toluene under applied pressures up to 3 kbar is reported. Near 3 kbar, electrons are attached to toluene yet the observed mobility is considerably higher than that expected for ions at this pressure. The mobility decreases gradually with increasing dilution by n-pentane and increases with increasing temperature. The results are consistent with a hopping mechanism whereby the electron transfers resonantly (isoenergetically) from a toluene anion to a neighboring toluene site. C1 UNIV TOKYO,DEPT PURE & APPL SCI,TOKYO 153,JAPAN. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 12 TC 4 Z9 4 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 17 PY 1994 VL 98 IS 7 BP 1974 EP 1977 DI 10.1021/j100058a042 PG 4 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400042 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DELPAPA, C DAURIA, S FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T FELD, L FREY, A GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KATZ, UF KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GEORGE, S GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MORGADO, CJS OMARA, JA TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S BORZEMSKI, P CHWASTOWSKI, J ESKREYS, A PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DREWS, G FLASINSKI, M FLECK, I GILKINSON, DJ GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HESSLING, H HULTSCHIG, H JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KROGER, W KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSURUGAI, T VOGEL, W WESTPHAL, D WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G NUTI, M PELFER, P ANZIVINO, G DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH STAVRIANAKOU, M WILSON, AS BRUCKMANN, H DANNEMANN, A HOLM, U HORSTMANN, D KAMMERLOCHER, H KREBS, B NEUMANN, T SINKUS, R WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL LONG, KR MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIM, JN MATTHEWS, CG MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BAILEY, D BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE HARNEW, N KHATRI, T LUFFMAN, P MORAWITZ, P NASH, J ROOCROFT, NC WALCZAK, R WILSON, FF YIP, T ABBIENDI, G BERTOLIN, A BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BULMAHN, J BUTTERWORTH, JM FEILD, RG OH, BY WHITMORE, JJ CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C VANHOOK, M HUBBARD, B LOCKMAN, W SADROZINSKI, HFW SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M MINE, S NAGASAWA, Y NAGIRA, T NAKAO, M OKUNO, H SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A SACCHI, R STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB GINGRICH, DM HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS SAMPSON, CR TEUSCHER, RJ BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM TYMIENIECKA, T WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y AF DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DELPAPA, C DAURIA, S FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T FELD, L FREY, A GEERTS, M GEITZ, G HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KATZ, UF KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL SCHRAMM, D WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FOSTER, B GEORGE, S GILMORE, R HEATH, GP HEATH, HF LANCASTER, M LLEWELLYN, TJ MORGADO, CJS OMARA, JA TAPPER, RJ WILSON, SS YOSHIDA, R RAU, RR ARNEODO, M SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S BORZEMSKI, P CHWASTOWSKI, J ESKREYS, A PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK BOTTCHER, S COLDEWEY, C DREWS, G FLASINSKI, M FLECK, I GILKINSON, DJ GOTTLICHER, P GUTJAHR, B HAAS, T HAGGE, L HAIN, W HASELL, D HESSLING, H HULTSCHIG, H JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H KROGER, W KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D POSNECKER, KU ROHDE, M ROLDAN, J SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSURUGAI, T VOGEL, W WESTPHAL, D WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G NUTI, M PELFER, P ANZIVINO, G DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH STAVRIANAKOU, M WILSON, AS BRUCKMANN, H DANNEMANN, A HOLM, U HORSTMANN, D KAMMERLOCHER, H KREBS, B NEUMANN, T SINKUS, R WICK, K FURTJES, A LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W TERRON, J ZETSCHE, F BACON, TC BEUSELINCK, R BUTTERWORTH, I GALLO, E HARRIS, VL LONG, KR MILLER, DB PRINIAS, A SEDGBEER, JK VORVOLAKOS, A WHITFIELD, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D AN, SH HONG, SM KIM, CO KIM, TY NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIM, JN MATTHEWS, CG MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG STLAURENT, M ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, IH ROMANOWSKI, TA SEIDLEIN, R BAILEY, D BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE HARNEW, N KHATRI, T LUFFMAN, P MORAWITZ, P NASH, J ROOCROFT, NC WALCZAK, R WILSON, FF YIP, T ABBIENDI, G BERTOLIN, A BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BULMAHN, J BUTTERWORTH, JM FEILD, RG OH, BY WHITMORE, JJ CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C VANHOOK, M HUBBARD, B LOCKMAN, W SADROZINSKI, HFW SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M MINE, S NAGASAWA, Y NAGIRA, T NAKAO, M OKUNO, H SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A SACCHI, R STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB GINGRICH, DM HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS SAMPSON, CR TEUSCHER, RJ BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM TYMIENIECKA, T WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI OBSERVATION OF DIRECT PROCESSES IN PHOTOPRODUCTION AT HERA SO PHYSICS LETTERS B LA English DT Article ID CENTRAL TRACKING DETECTOR; LEADING-ORDER QCD; PARTON DISTRIBUTIONS; MONTE-CARLO; PHOTON; ZEUS; COLLIDER AB Jets in photoproduction events have been studied with the ZEUS detector for gammap centre-of-mass energies ranging from 130 to 2 50 GeV. The inclusive jet distributions give evidence for the dominance of resolved photon interactions. In the di-jet sample the direct processes are for the first time clearly isolated. Di-jet cross sections for the resolved and direct processes are given in a restricted kinematic range. C1 INFN, BOLOGNA, ITALY. UNIV BOLOGNA, I-40126 BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. UNIV BRISTOL, HH WILLS PHYS LAB, BRISTOL BS8 1TL, AVON, ENGLAND. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. UNIV CALABRIA, DEPT PHYS, COSENZA, ITALY. INFN, COSENZA, ITALY. COLUMBIA UNIV, NEVIS LABS, IRVINGTON, NY USA. INST NUCL PHYS, PL-31342 KRAKOW, POLAND. STANISLAW STASZIC UNIV MIN & MET, FAC PHYS & NUCL TECHNIQUES, PL-30059 KRAKOW, POLAND. JAGIELLONIAN UNIV, DEPT PHYS, PL-31007 KRAKOW, POLAND. DESY, W-2000 HAMBURG 52, GERMANY. DESY, ZEUTHEN INST HOCHENERGIEPHYS, ZEUTHEN, GERMANY. UNIV FLORENCE, I-50121 FLORENCE, ITALY. INFN, FLORENCE, ITALY. INFN, LAB NAZL FRASCATI, FRASCATI, ITALY. UNIV FREIBURG, INST PHYS, W-7800 FREIBURG, GERMANY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HAMBURG, INST EXPTL PHYS 1, W-2000 HAMBURG 13, GERMANY. UNIV HAMBURG, INST EXPTL PHYS 2, W-2000 HAMBURG 13, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, HIGH ENERGY NUCL PHYS GRP, LONDON SW7 2AZ, ENGLAND. UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH 1, GERMANY. KOREA UNIV, SEOUL, SOUTH KOREA. LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA. UNIV AUTONOMA MADRID, DEPT FIS TEOR, MADRID 34, SPAIN. UNIV MANITOBA, DEPT PHYS, WINNIPEG R3T 2N2, MANITOBA, CANADA. MCGILL UNIV, DEPT PHYS, MONTREAL H3A 2T5, QUEBEC, CANADA. MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PYS, MOSCOW, RUSSIA. NIKHEF, AMSTERDAM, NETHERLANDS. OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND. UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY. INFN, PADUA, ITALY. PENN STATE UNIV, DEPT PHYS, UNIV PK, PA 16802 USA. INFN, ROME, ITALY. UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA. UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN 21, GERMANY. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV TOKYO, INST NUCL STUDY, TOKYO 113, JAPAN. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO 158, JAPAN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10124 TURIN, ITALY. INFN, TURIN, ITALY. TORINO UNIV, FAC SCI 2, ALESSANDRIA, ITALY. INFN, ALESSANDRIA, ITALY. UNIV TORONTO, DEPT PHYS, TORONTO M5S 1A1, ONTARIO, CANADA. UNIV LONDON UNIV COLL, DEPT PHYS & ASTRON, LONDON WC1E 6BT, ENGLAND. VIRGINIA POLYTECH INST & STATE UNIV, DEPT PHYS, BLACKSBURG, VA 24061 USA. UNIV WARSAW, INST EXPTL PHYS, PL-00325 WARSAW, POLAND. INST NUCL STUDIES, WARSAW, POLAND. WEIZMANN INST SCI, DEPT NUCL PHYS, IL-76100 REHOVOT, ISRAEL. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. YORK UNIV, DEPT PHYS, N YORK, ON, CANADA. IROE, FLORENCE, ITALY. UNIV SALERNO, DIPARTIMENTO FIS, I-84100 SALERNO, ITALY. RP ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RI Wiggers, Leo/B-5218-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Frasconi, Franco/K-1068-2016; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Guida, MIchele/J-4714-2012; Katz, Uli/E-1925-2013 OI iori, maurizio/0000-0002-6349-0380; Lancaster, Mark/0000-0002-8872-7292; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Frasconi, Franco/0000-0003-4204-6587; Anzivino, Giuseppina/0000-0002-5967-0952; Castellini, Guido/0000-0002-0177-0643; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Guida, MIchele/0000-0002-1108-5391; Katz, Uli/0000-0002-7063-4418 NR 40 TC 86 Z9 86 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD FEB 17 PY 1994 VL 322 IS 3 BP 287 EP 300 DI 10.1016/0370-2693(94)91121-5 PG 14 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MW840 UT WOS:A1994MW84000020 ER PT J AU JAROSZEWICZ, T KURZEPA, PS AF JAROSZEWICZ, T KURZEPA, PS TI RANDOM-WALK REPRESENTATIONS AND 4-FERMION INTERACTIONS SO ANNALS OF PHYSICS LA English DT Article ID DYNAMICAL SYMMETRY-BREAKING; INTERSECTION LOCAL-TIMES; CLASSICAL SPIN SYSTEMS; AVOIDING RANDOM-WALK; 4 DIMENSIONS; GAUGE-THEORIES; FIELD-THEORY; CORRELATION INEQUALITIES; ANOMALOUS DIMENSIONS; QUARK CONDENSATE AB We develop a new, nonperturbative method of analysis of quantum field theories of interacting fermions. Our approach is based on the previously developed representation of fermion propagation in terms of smooth, directed random walks. This method generalizes Symanzik's ''polymer gas'' description of bosonic quantum fields. We derive and analyze the Hausdorff recurrence, and intersection properties of directed random walks, and we provide a complete description of fermion correlation functions in terms of intersection local times of these walks. We then consider the (psipsiBAR)2 interaction both in the 1/N expansion and in the N --> 0 limit. We show that, if the fermion-fermion interaction is repulsive, the renormalized theory is free above two spacetime dimensions. Attractive interactions, however, may lead to the appearance of a propagating boson in the spectrum of the theory. In that case the resultant finite-range fermion-fermion interactions modify the upper critical dimension to four. (C) 1994 Academic Press, Inc. C1 LOS ALAMOS NATL LAB, THEORET DIV T-8, LOS ALAMOS, NM 87545 USA. RP JAROSZEWICZ, T (reprint author), UNIV CALIF LOS ANGELES, DEPT PHYS, LOS ANGELES, CA 90024 USA. NR 113 TC 1 Z9 1 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD FEB 15 PY 1994 VL 230 IS 1 BP 52 EP 100 DI 10.1006/aphy.1994.1017 PG 49 WC Physics, Multidisciplinary SC Physics GA MZ144 UT WOS:A1994MZ14400003 ER PT J AU BULTMAN, SJ KLEBIG, ML MICHAUD, EJ SWEET, HO DAVISSON, MT WOYCHIK, RP AF BULTMAN, SJ KLEBIG, ML MICHAUD, EJ SWEET, HO DAVISSON, MT WOYCHIK, RP TI MOLECULAR ANALYSIS OF REVERSE MUTATIONS FROM NONAGOUTI (A) TO BLACK-AND-TAN (A(T)) AND WHITE-BELLIED AGOUTI (A(W)) REVEALS ALTERNATIVE FORMS OF AGOUTI TRANSCRIPTS SO GENES & DEVELOPMENT LA English DT Article DE AGOUTI LOCUS; A, A(T), A(W); REVERSE MUTATIONS; VL30; HOMOLOGOUS RECOMBINATION ID LONG TERMINAL REPEAT; CELL GAMMA-GENES; NUCLEOTIDE-SEQUENCE; MOUSE CELLS; 30S RNA; VIRUS; VL30; EXPRESSION; DNA; PROVIRUS AB The agouti gene regulates the differential production of eumelanin (black or brown) and phaeomelanin (yellow) pigment granules by melanocytes in the hair follicles of mice. The original nonagouti (a) allele, which confers a predominantly black coat color, has been shown to revert to two other more dominant agouti alleles, black-and-tan (a(t)) and white-bellied agouti (A(W)), with an exceptionally high frequency. The a(t) and A(W) alleles confer phenotypes in which the pigmentation is not uniformly distributed over the dorsal and ventral surfaces of the animal; in both cases the ventral surface of the animal is markedly lighter than the dorsal surface due to an increase in phaeomelanin production. To understand the unusually high reversion rate of a to a(t) or A(W), and to decipher the molecular events associated with the different pigmentation patterns associated with these three agouti alleles, we have characterized a, a(t) and A(W) at the molecular level. Here, we report that insertions of 11, 6, and 0.6 kb are present at precisely the same position in the first intron of the agouti gene in a, a(t), and A(W), respectively. The a insertion consists of a 5.5-kb VL30 element that has incorporated 5.5 kb of additional sequence internally; this internal sequence is flanked by 526 bp direct repeats. The a(t) allele contains only the VL30 element and a single, internal 526-bp repeat. The A(W) allele has only a solo VL30 LTR. Based on the comparison of the structure of the a(t) and A(W) insertions, we propose that reverse mutations occur by excision of inserted sequences in a through homologous recombination, utilizing either the 526-bp direct repeats to generate a(t) or the VL30 LTRs to generate A(W). Moreover, the analysis of these three alleles has allowed us to identify additional exons of the agouti gene that give rise to alternatively processed farms of agouti mRNA. We demonstrate that the distinct insertions in a, a(t) and A(w) cause pigmentation differences by selectively inactivating the expression of different forms of agouti transcripts. C1 OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, OAK RIDGE GRAD SCH BIOMED SCI, OAK RIDGE, TN 37831 USA. JACKSON LAB, BAR HARBOR, ME 04609 USA. FU NIEHS NIH HHS [IAG 222Y01-ES-10067] NR 38 TC 85 Z9 89 U1 0 U2 6 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 FEB 15 PY 1994 VL 8 IS 4 BP 481 EP 490 DI 10.1101/gad.8.4.481 PG 10 WC Cell Biology; Developmental Biology; Genetics & Heredity SC Cell Biology; Developmental Biology; Genetics & Heredity GA MZ288 UT WOS:A1994MZ28800008 PM 8125260 ER PT J AU VALONE, SM AF VALONE, SM TI A DIMENSIONALLY SCALED GENERALIZATION OF CONSTRAINED SEARCH ENERGY DENSITY FUNCTIONALS SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID PERTURBATION-THEORY; ELECTRON-DENSITIES; 2-ELECTRON ATOMS; FORMULATION; MATRICES; ORBITALS; STATES AB A dimensionally scaled generalization of constrained search density functional theory allows access to some simple model problems. These might be valuable for testing and perhaps improving conventional density functionals. One specific model problem is solved: When extrapolated to infinite numbers of spatial dimensions, the energy density functional for spherically symmetric, two-electron systems can be calculated to arbitrary accuracy. (C) 1994 John Wiley and Sons, Inc. RP VALONE, SM (reprint author), LOS ALAMOS NATL LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. NR 28 TC 5 Z9 5 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0020-7608 EI 1097-461X J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD FEB 15 PY 1994 VL 49 IS 5 BP 591 EP 600 DI 10.1002/qua.560490505 PG 10 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA MU698 UT WOS:A1994MU69800004 ER PT J AU LEE, SM AF LEE, SM TI MICROSTRUCTURAL STABILITY OF METASTABLE AMORPHOUS AND CRYSTALLINE GE1-XSNX ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Amorphous Ge0.75Sn0.25 films, nominally 2000 angstrom thick were produced by rf sputtering. The films were transformed to polycrystalline samples with no observable phase segregated beta-Sn. The mechanisms of formation of this phase and subsequent phases as a function of temperature were studied with differential scanning calorimetry and transmission electron microscopy. Through these measurements we were able to identify a volume in parameter space from which polycrystalline alloys could be nucleated and growth without simultaneous Sn segregation. C1 HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138. LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,H DIV,LIVERMORE,CA 94550. NR 9 TC 11 Z9 11 U1 2 U2 3 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 FEB 15 PY 1994 VL 75 IS 4 BP 1987 EP 1992 DI 10.1063/1.356323 PG 6 WC Physics, Applied SC Physics GA MX654 UT WOS:A1994MX65400022 ER PT J AU MAO, SN XI, XX LI, Q VENKATESAN, T BEESABATHINA, DP SALAMANCARIBA, L WU, XD AF MAO, SN XI, XX LI, Q VENKATESAN, T BEESABATHINA, DP SALAMANCARIBA, L WU, XD TI SUPERCONDUCTING AND STRUCTURAL-PROPERTIES OF ND2-XCEXCUO4-Y THIN-FILMS ON PEROVSKITE AND FLUORITE SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID YTTRIA-STABILIZED ZIRCONIA; YBA2CU3O7-DELTA FILMS; INSITU GROWTH; EPITAXY; DEVICE; ZRO2; MGO AB High quality epitaxial Nd2-xCeCuO4-y (NCCO) thin films were fabricated on various substrates by pulsed-laser deposition using N2O reactive gas. The similarities and dissimilarities of the superconducting and structural properties of NCCO films, on perovskite-type substrates such as LaAlO3, NdGaO3, and SrTiO3 and on a fluorite-type substrate of yttria-stabilized zirconia (YSZ), were investigated systematically as a function of film thickness by transport measurements and structural analysis. A remarkable reduction of T(c) was observed when the film was thinner than a critical thickness, which strongly depends on the substrate. The critical thicknesses for which T(c) is 80% of T(c max) are 1200, 1000, 600, and 450 angstrom for LaAlO3, NdGaO3, SrTiO3, and YSZ, respectively. YSZ turns out to be the best candidate for the growth of very thin NCCO films among the substrates studied. These results show a strong correlation between the strain and T(c) in NCCO thin films and point the way to the fabrication of n-type superconducting electric field devices using ultrathin NCCO films. C1 UNIV MARYLAND,DEPT MAT & NUCL ENGN,CTR SUPERCONDUCT RES,COLL PK,MD 20742. UNIV MARYLAND,DEPT ELECT ENGN,COLL PK,MD 20742. LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545. RP MAO, SN (reprint author), UNIV MARYLAND,DEPT PHYS,CTR SUPERCONDUCT RES,COLL PK,MD 20742, USA. RI Salamanca-Riba, Lourdes/B-3785-2009; Venkatesan, Thirumalai/E-1667-2013 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403; NR 36 TC 14 Z9 15 U1 0 U2 3 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 FEB 15 PY 1994 VL 75 IS 4 BP 2119 EP 2124 DI 10.1063/1.356318 PG 6 WC Physics, Applied SC Physics GA MX654 UT WOS:A1994MX65400044 ER PT J AU CIRILLO, M COCCIOLO, P MERLO, V GRONBECHJENSEN, N PARMENTIER, RD AF CIRILLO, M COCCIOLO, P MERLO, V GRONBECHJENSEN, N PARMENTIER, RD TI LONG JOSEPHSON-JUNCTIONS WITH UNIFORM DC AND RF DRIVING CURRENTS - GENERAL RESULTS FOR THE PHASE-LOCKED REGIMES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LOCKING; SOLITON; OSCILLATORS AB We investigate the dynamics of a long overlap Josephson junction in the presence of constant and sinusoidally time-varying currents on a finite-length spatial interval imposing open circuit boundary conditions at the ends. We scan the behavior of the system in parameter plane regions where the phase locking between the fluxon oscillations in the junction and the external time-varying field is possible. This scanning is performed for different values of the dc driving term and for lengths of the spatial interval ranging from 3.8 up to 15 and dissipation parameters ranging from 0.025 to 0.25. In spite of the complexity of the system and of the broad range of parameters investigated we find that the response to the rf excitation presents general features that can be well understood in terms of current-voltage characteristics of the junctions (and related experimental parameters). The results are compared with a recent theoretical model based on a perturbation approach of the sine-Gordon Hamiltonian. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. RP CIRILLO, M (reprint author), UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00133 ROME,ITALY. OI merlo, vittorio/0000-0002-4858-3714 NR 17 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 FEB 15 PY 1994 VL 75 IS 4 BP 2125 EP 2130 DI 10.1063/1.356298 PG 6 WC Physics, Applied SC Physics GA MX654 UT WOS:A1994MX65400045 ER PT J AU SUNIL, D SOKOLOV, J RAFAILOVICH, MH KOTYUZHANSKII, B GAFNEY, HD DUAN, X WILKENS, BJ HANSON, AL AF SUNIL, D SOKOLOV, J RAFAILOVICH, MH KOTYUZHANSKII, B GAFNEY, HD DUAN, X WILKENS, BJ HANSON, AL TI MICROSTRUCTURE OF PHOTODEPOSITED FE IN POROUS VYCOR GLASS (VOL 74, PG 3768, 1993) SO JOURNAL OF APPLIED PHYSICS LA English DT Correction, Addition C1 BELLCORE,RED BANK,NJ 07701. CUNY QUEENS COLL,DEPT CHEM,FLUSHING,NY 11367. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP SUNIL, D (reprint author), CUNY QUEENS COLL,DEPT PHYS,FLUSHING,NY 11367, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1994 VL 75 IS 4 BP 2301 EP 2301 DI 10.1063/1.357040 PG 1 WC Physics, Applied SC Physics GA MX654 UT WOS:A1994MX65400073 ER PT J AU CARMAN, HS AF CARMAN, HS TI LOW-ENERGY-ELECTRON ATTACHMENT TO CLUSTERS OF NITRIC-OXIDE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EXCITED RYDBERG ATOMS; CARBON-DIOXIDE CLUSTERS; RARE-GAS ATOMS; RATE CONSTANTS; PHOTOELECTRON-SPECTROSCOPY; UNIMOLECULAR DECOMPOSITION; VIBRATIONAL-EXCITATION; VANDERWAALS MOLECULES; TRANSFER COLLISIONS; METAL-CLUSTERS AB The attachment of low energy (9-80 meV) electrons to clusters of nitric oxide (NO) has been studied by means of Rydberg electron transfer (RET) from selected nd states of rubidium (n = 15-40). The product negative ions have stoichiometry (NO)(x)(-) (x = 2-60) and exhibit even/odd intensity alternations (odd > even) which increase in magnitude with cluster size such that only odd cluster ions are observed for x greater than or similar to 20. The experimental data are consistent with an evaporative attachment mechanism in which the production of odd cluster ions is kinetically favored due to differences in stabilities between odd and even cluster ions. These differences in stabilities are attributed to the spin pairing of valence electrons which results in extensive dimerization of NO in condensed phases. It is postulated that, for x > 3, the excess electron becomes localized to form an (NO)(3)(-) ion which is solvated by NO dimers. Interaction potentials governing the initial electron capture process are also discussed. RP CARMAN, HS (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, CHEM PHYS SECT, OAK RIDGE, TN 37831 USA. NR 91 TC 27 Z9 27 U1 1 U2 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1994 VL 100 IS 4 BP 2629 EP 2636 DI 10.1063/1.466458 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MX628 UT WOS:A1994MX62800023 ER PT J AU KRESS, JD WALKER, RB HAYES, EF PENDERGAST, P AF KRESS, JD WALKER, RB HAYES, EF PENDERGAST, P TI QUANTUM SCATTERING STUDIES OF LONG-LIVED RESONANCES FOR THE REACTION NE+H-2(+)-]NEH++H SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POTENTIAL-ENERGY SURFACE; CUMULATIVE REACTION PROBABILITIES; DISCRETE VARIABLE REPRESENTATION; COLLINEAR INELASTIC-SCATTERING; ION-MOLECULE REACTIONS; ROTATING LINEAR-MODEL; REACTION HE+H2+->HEH++H; MECHANICAL CALCULATIONS; TRIATOMIC-MOLECULES; CHEMICAL-REACTIONS AB The bending-corrected rotating linear model (BCRLM) is used to investigate the reaction of neon with H-2(+) (v=0-3) using three different fits to the ab initio potential-energy surface computed by Urban, Jaquet, and Staemmler. Numerous long-lived scattering resonances are found for each surface. The number and position of these scattering resonances are found to be sensitive to the relatively small differences among these three surfaces. These BCRLM results demonstrate how the rich resonance structure that appears in the partial cross sections is washed out in the total cross section. The integrated rates for reactivity from v=0 and 1 are nearly identical for all three potential-energy surfaces over a wide range of temperatures. However, the integrated rates from v=2 and 3 exhibit significant differences among the potential-energy surfaces. A vibrationally adiabatic hyperspherical model of the trapped resonance states provides insight into the nature and contribution of these resonances to reactive scattering. The more accurate of the three fits to the ab initio potential-energy surface (obtained using the functional form of Aguado and Paniagua) is also used to obtain converged results for total angular momentum J=0 employing the adiabatically adjusting, principal axis, hyperspherical (APH) formulation of Pack and Parker for quantum reactive scattering in three dimensions (3D). An eigenlifetime analysis of these 3D scattering results reveals numerous resonances with lifetimes of 1 ps or more. While this resonance structure is sensitive to the details of the potential energy surface, with appropriate Gaussian averaging over the total scattering energy, the cumulative reaction probabilities (CRPs) are not very sensitive to changes in the potential energy surface. Moreover, these quantum CRPs agree rather well with CRPs predicted using variational Rice-Ramsperger-Kassel-Marcus (RRKM) calculations. C1 OHIO STATE UNIV, DEPT CHEM, COLUMBUS, OH 43210 USA. RP KRESS, JD (reprint author), LOS ALAMOS NATL LAB, DIV THEORET T12 MSB268, LOS ALAMOS, NM 87545 USA. NR 55 TC 52 Z9 52 U1 0 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1994 VL 100 IS 4 BP 2728 EP 2742 DI 10.1063/1.466467 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MX628 UT WOS:A1994MX62800033 ER PT J AU WOON, DE AF WOON, DE TI BENCHMARK CALCULATIONS WITH CORRELATED MOLECULAR WAVE-FUNCTIONS .5. THE DETERMINATION OF ACCURATE AB-INITIO INTERMOLECULAR POTENTIALS FOR HE-2, NE-2, AND AR-2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ABINITIO CALCULATION; BASIS-SETS; ENERGY CURVE; NE2; DIMER; ARGON; NEON AB Dimer interactions of helium, neon, and argon have been studied using the augmented correlation consistent basis sets of Dunning and co-workers. Two correlation methods have been employed throughout; Moller-Plesset perturbation theory through fourth-order (MP4) and single and double excitation coupled-cluster theory with perturbative treatment of triple excitations [CCSD(T)]. Full configuration interaction (FCI) calculations were performed on He-2 for some basis sets. In general, only valence electrons were correlated, although some calculations which also correlated the n = 2 shell of Ar-2, were performed. Dimer potential energy curves were determined using the supermolecule method with and without the counterpoise correction. A series of additional basis sets beyond the augmented correlation consistent Sets were explored in which the diffuse region of the radial function space has been systematically saturated. In combination with the systematic expansion across angular function space which is inherent to the correlation consistent prescription, this approach guarantees very accurate atomic polarizabilities and hyperpolarizabilities and should lead to an accurate description of dispersion forces. The best counterpoise-corrected MP4 values for the well depths of the three dimers are (in microhartrees, empirical values in parentheses) He-2, 31.9 (34.6); Net, 123 (134); and Ar-2, 430 (454). The corresponding CCSD(T) values are He-2, 33.1; Ne-2, 128; and Ar-2, 417. Although these values are very good, the nearly exponential convergence of well depth as a function of basis quality afforded by using the various series of correlation consistent basis sets allows estimation of complete basis set (CBS) limiting values. The MP4 estimated CBS limits are He-2, 32.2; Ne-2, 126; and Ar-2, 447. The corresponding CCSD(T) values are He-2, 33.4; Ne-2, 130; and Ar-2, 430. Equilibrium separations are also reproduced with similar accuracy. RP WOON, DE (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 35 TC 164 Z9 165 U1 1 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1994 VL 100 IS 4 BP 2838 EP 2850 DI 10.1063/1.466478 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MX628 UT WOS:A1994MX62800044 ER PT J AU NICHOLS, JA HERYADI, D YEAGER, DL GOLAB, JT AF NICHOLS, JA HERYADI, D YEAGER, DL GOLAB, JT TI IONIZATION-POTENTIALS OF CH2 - A COMPARISON OF THE MULTICONFIGURATIONAL SPIN TENSOR ELECTRON PROPAGATOR METHOD WITH BENCHMARK FULL CONFIGURATION-INTERACTION AND LARGE-SCALE MULTIREFERENCE CONFIGURATION-INTERACTION CALCULATIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID 2ND-ORDER PERTURBATION-THEORY; OPEN-SHELL; METHYLENE; MOLECULES; AFFINITY; VALENCE; ATOMS; NH2 AB Using the same basis sets and geometries as were previously used in ''benchmark'' full configuration interaction (FCI) calculations we compare the multiconfigurational spin tensor electron propagator method (MCSTEP) with FCI for the vertical ionization potentials (IPs) in CH2 below 19.0 eV. Our results show that MCSTEP using a full valence complete active space MCSCF initial state accurately obtains the lowest several principal vertical ionization potentials. We also determine vertical and adiabatic IPs in CH2 with MCSTEP using larger bases and compare to accurate large scale multireference singles and doubles CI with quadrupole excitations estimated via a Davidson correction. C1 TEXAS A&M UNIV, DEPT CHEM, COLL STN, TX 77843 USA. AMOCO CHEM CO, NAPERVILLE, IL 60566 USA. RP NICHOLS, JA (reprint author), PACIFIC NW LAB, BATTLE BLVD, POB 999, RICHLAND, WA 99352 USA. RI Yeager, Danny/D-3679-2015; OI Yeager, Danny/0000-0001-9832-0034; Nichols, Jeffrey/0000-0001-5454-9726 NR 33 TC 22 Z9 22 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1994 VL 100 IS 4 BP 2947 EP 2952 DI 10.1063/1.466437 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MX628 UT WOS:A1994MX62800057 ER PT J AU WOON, DE DUNNING, TH AF WOON, DE DUNNING, TH TI GAUSSIAN-BASIS SETS FOR USE IN CORRELATED MOLECULAR CALCULATIONS .4. CALCULATION OF STATIC ELECTRICAL RESPONSE PROPERTIES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POLARIZATION BASIS FUNCTIONS; BODY PERTURBATION-THEORY; WAVE-FUNCTIONS; GROUND-STATE; CHLORIDE-ION; POLARIZABILITIES; NEON; HYPERPOLARIZABILITIES; AR; DISPERSION AB An accurate description of the electrical properties of atoms and molecules is critical for quantitative predictions of the nonlinear properties of molecules and of long-range atomic and molecular interactions between both neutral and charged species. We report a systematic study of the basis sets required to obtain accurate correlated values for the static dipole (alpha(1)), quadrupole (alpha(2)), and octopole (alpha(3)) polarizabilities and the hyperpolarizability (gamma) of the rare gas atoms He, Ne, and Ar. Several methods of correlation treatment were examined, including various orders of Moller-Plesset perturbation theory (MP2, MP3, MP4), coupled-cluster theory with and without perturbative treatment of triple excitations [CCSD, CCSD(T)], and singles and doubles configuration interaction (CISD). All of the basis sets considered here were constructed by adding even-tempered sets of diffuse functions to the correlation consistent basis sets of Dunning and co-workers. With multiply-augmented sets we find that the electrical properties of the rare gas atoms converge smoothly to values that are in excellent agreement with the available experimental data and/or previously computed results. As a further test of the basis sets presented here, the dipole polarizabilities of the F- and Cl-- anions and of the HCl and N-2 molecules are also reported. RP WOON, DE (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 58 TC 1743 Z9 1749 U1 5 U2 79 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 FEB 15 PY 1994 VL 100 IS 4 BP 2975 EP 2988 DI 10.1063/1.466439 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MX628 UT WOS:A1994MX62800059 ER PT J AU WALL, MA AF WALL, MA TI SPECIMEN PREPARATION OF FREESTANDING, THICK-METAL, MULTILAYERED FILMS IN CROSS-SECTION SO MICROSCOPY RESEARCH AND TECHNIQUE LA English DT Article DE THICK FILMS; LOW-ANGLE ION MILLING; DIFFERENTIAL SPUTTERING RATE ID TRANSMISSION ELECTRON-MICROSCOPY; TEM AB A new preparation method permits the production of large-area, electron-transparent, transmission electron microscopy (TEM) specimens in cross section of free-standing, thick, multilayered structures. Such production often has been difficult in the past because of large chemical differences between the component layers in the multilayer. This difference usually results in a large difference in thinning rates between the layers. A unique combination of electroplating, lapping, dimpling, and low-angle ion milling is a successful and reproducible technique for producing high-quality TEM specimens of these complex materials. Procedures and results presented here are for a 304 stainless-steel/copper multilayer having a repeat period of 20 nm and a total thickness of 20 mu m. (C) 1994 Wiley-Liss, Inc. RP WALL, MA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,POB 808 L-350,LIVERMORE,CA 94551, USA. NR 18 TC 8 Z9 8 U1 0 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1059-910X J9 MICROSC RES TECHNIQ JI Microsc. Res. Tech. PD FEB 15 PY 1994 VL 27 IS 3 BP 262 EP 267 DI 10.1002/jemt.1070270306 PG 6 WC Anatomy & Morphology; Biology; Microscopy SC Anatomy & Morphology; Life Sciences & Biomedicine - Other Topics; Microscopy GA MV923 UT WOS:A1994MV92300005 PM 8204914 ER PT J AU DODELSON, S JUBAS, JM AF DODELSON, S JUBAS, JM TI COSMOLOGICAL SIGNATURES OF DECAYING DARK-MATTER SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE ELEMENTARY PARTICLES; RADIATION MECHANISMS NONTHERMAL; INTERGALACTIC MEDIUM; COSMOLOGY OBSERVATIONS; DARK MATTER; DIFFUSE RADIATION ID LYMAN-ALPHA CLOUDS; H-I REGIONS; GALACTIC HALO; HIGH-REDSHIFT; BACKGROUND-RADIATION; ABSORPTION SYSTEMS; HYPOTHESIS; GALAXY; REIONIZATION; TELESCOPE AB The decaying dark matter (DDM) scenario is a viable way of ionizing the Universe at high redshifts. We examine the constraints on this scenario due to the diffuse ultraviolet flux and Gunn-Peterson tests. The latter require the decaying particle's lifetime to be less than approximately 10(23) S. Observations of the diffuse UV flux along with a conservative estimate of its Galactic component require the DDM particle to have mass greater than 28.5 eV. With larger estimates of the Galactic contribution to the UV flux, the limit becomes m > 34.5 Ev. We also point out a distinctive signature of DDM: a sharp drop in the infrared part of the spectrum. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. RP DODELSON, S (reprint author), NASA,FERMI NATL ACCELERATOR LAB,FERMILAB ASTROPHYS CTR,BOX 500,BATAVIA,IL 60510, USA. NR 51 TC 11 Z9 11 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD FEB 15 PY 1994 VL 266 IS 4 BP 886 EP 890 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MW545 UT WOS:A1994MW54500014 ER PT J AU CARTER, CD BARLOW, RS AF CARTER, CD BARLOW, RS TI SIMULTANEOUS MEASUREMENTS OF NO, OH, AND THE MAJOR SPECIES IN TURBULENT FLAMES SO OPTICS LETTERS LA English DT Article AB We present a method for obtaining time-resolved point measurements of the pollutant nitric oxide (NO), hydroxyl (OH), the temperature, and the major species-using a combination of laser-induced fluorescence and Rayleigh/Raman scattering-in turbulent flames. Using single-shot measurements of temperature and the major species concentrations, we calculate the mixture fraction, which characterizes the state of mixing in the gas, and the corrections for the NO and OH fluorescence. For NO the time-resolved detection limit is approximately 10 parts in 10(6). We demonstrate this facility with measurements of NO versus the mixture fraction in a turbulent nonpremixed H-2 jet flame. RP CARTER, CD (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 8 TC 39 Z9 39 U1 2 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD FEB 15 PY 1994 VL 19 IS 4 BP 299 EP 301 DI 10.1364/OL.19.000299 PG 3 WC Optics SC Optics GA MY672 UT WOS:A1994MY67200021 PM 19829623 ER PT J AU SANCHEZCASTRO, C AF SANCHEZCASTRO, C TI NEGATIVE MAGNETORESISTANCE OF CE3BI4PT3 AT LOW-TEMPERATURES SO PHYSICAL REVIEW B LA English DT Article ID FERMION AB We have calculated the field dependence of the magnetoresistance and the Hall constant for the N = 2 insulating phase of the Anderson lattice Hamiltonian using a slave-boson approach. At low temperatures, the magnetoresistance is negative and its field dependence as well as that of the Hall coefficient are in qualitative agreement with the experimental results for Ce3Bi4Pt3. At high temperatures, the magnetoresistance has a small positive quadratic field dependence. We predict an almost identical value of the transverse and longitudinal magnetoresistances for this compound at low temperatures. RP SANCHEZCASTRO, C (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 12 TC 7 Z9 7 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1994 VL 49 IS 7 BP 4421 EP 4424 DI 10.1103/PhysRevB.49.4421 PG 4 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800001 ER PT J AU KARPOV, VG TSIDILKOVSKII, EI AF KARPOV, VG TSIDILKOVSKII, EI TI BAND TAILS IN DILUTED MAGNETIC SEMICONDUCTORS SO PHYSICAL REVIEW B LA English DT Article AB Tails in the density of electron states in diluted magnetic semiconductors are examined theoretically. The exchange interaction between a charge carrier and magnetic ions makes the energy dependence of the density of states in the tails markedly different from those known for nonmagnetic solid solutions. The cases of uncorrelated and strongly correlated disorder are analyzed. In both cases the density of states in the tail turns out to be nonmonotonic. In the case of uncorrelated disorder the density of states has a gap, while it possesses a deep valley in the case of strongly correlated disorder. The thermal disorder in the spin system of the ions makes the density of states temperature dependent. Some possible experimental manifestations of these features of the tails in diluted magnetic semiconductors are discussed. C1 AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA. RP KARPOV, VG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Karpov, Victor/I-5169-2012; OI Karpov, Victor/0000-0003-2558-8368 NR 17 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1994 VL 49 IS 7 BP 4539 EP 4548 DI 10.1103/PhysRevB.49.4539 PG 10 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800017 ER PT J AU SIM, HK CHANG, YC JAMES, RB AF SIM, HK CHANG, YC JAMES, RB TI PHONON-DISPERSION IN RED MERCURIC IODIDE SO PHYSICAL REVIEW B LA English DT Article ID RAMAN-SCATTERING; OPTICAL PHONONS; HGI2; PHOTOLUMINESCENCE; SPECTROSCOPY; ABSORPTION; DETECTORS; SPECTRUM; CRYSTALS AB We present theoretical studies of phonon modes of undoped HgI2 in its red tetragonal form. A rigid-ion model including the Coulomb interaction is used which gives the best fit to the neutron scattering, infrared reflectivity, and Raman scattering data. The calculated sound velocities are also in accord with experiment. C1 SANDIA NATL LABS,DEPT PHYS SCI,LIVERMORE,CA 94550. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. NATL UNIV SINGAPORE,DEPT PHYS,SINGAPORE 0511,SINGAPORE. RP SIM, HK (reprint author), UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801, USA. NR 37 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 FEB 15 PY 1994 VL 49 IS 7 BP 4559 EP 4564 DI 10.1103/PhysRevB.49.4559 PG 6 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800019 ER PT J AU SOFO, JO MAHAN, GD AF SOFO, JO MAHAN, GD TI OPTIMUM BAND-GAP OF A THERMOELECTRIC-MATERIAL SO PHYSICAL REVIEW B LA English DT Article AB Transport properties of direct-gap semiconductors are calculated in order to find the best thermoelectrics. Previous calculations on semiconductors with indirect band gaps found that the best thermoelectrics had gaps equal to nk(B)T, where n = 6 - 10 and T is the operating temperature of the thermoelectric device. Here we report similar calculations on direct-gap materials. We find that the optimum gap is always greater than 6k(B)T, but can be much larger depending on the specific mechanism of electron scattering. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. RP SOFO, JO (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Sofo, Jorge/J-4415-2012; Sofo, Jorge/B-4344-2014 OI Sofo, Jorge/0000-0003-4513-3694; Sofo, Jorge/0000-0003-4513-3694 NR 17 TC 103 Z9 104 U1 3 U2 27 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 FEB 15 PY 1994 VL 49 IS 7 BP 4565 EP 4570 DI 10.1103/PhysRevB.49.4565 PG 6 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800020 ER PT J AU MANSON, JR RITCHIE, RH AF MANSON, JR RITCHIE, RH TI ENERGY-LOSS IN FAST-PARTICLE SURFACE SCATTERING AT GRAZING-INCIDENCE SO PHYSICAL REVIEW B LA English DT Article ID CHARGE-EXCHANGE; ATOMS; COLLISIONS AB The surface scattering of kilovolt-energy ions and atoms at glancing-incidence angles has contributed substantially to knowledge of elementary electronic excitations in the interface region. We consider the influence of inelastic exchange of mechanical energy, due to recoil of the target atoms, on the distribution of scattered projectile atoms. Although with a glancing-incident-angle geometry the relative energy loss by this mechanism is small, it can have a substantial effect on the angular distribution of the scattered particles. These conclusions are supported by numerical calculations of energy losses and scattered particle distributions. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. RP MANSON, JR (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. NR 19 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1994 VL 49 IS 7 BP 4881 EP 4885 DI 10.1103/PhysRevB.49.4881 PG 5 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800062 ER PT J AU SINGH, PP AF SINGH, PP TI RELATIVISTIC EFFECTS IN MERCURY - ATOM, CLUSTERS, AND BULK SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION; VANDERWAALS; DENSITY; MICROCLUSTERS; COVALENT AB We study the effects of relativity on the electronic structure of Hg as it evolves from an atom to a cluster, and then to the bulk. A comparison of nonrelativistic and scalar-relativistic results for bulk Hg, obtained self-consistently, clearly shows the importance of including the relativistic terms as well as treating the 5d-electrons as valencelike. Our cluster calculations show that the relativistic effects are equally important for clusters, and that the differences in many electronic properties such as the size dependence of the gap energy and the l character of Hg clusters with respect to other divalent-metal clusters, for example, Be and Mg, arise due to the relativistic terms, thus providing further insight into the electronic origins of these properties. RP SINGH, PP (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,L-268,LIVERMORE,CA 94550, USA. NR 24 TC 35 Z9 36 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 FEB 15 PY 1994 VL 49 IS 7 BP 4954 EP 4958 DI 10.1103/PhysRevB.49.4954 PG 5 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800071 ER PT J AU BLASE, X ZHU, XJ LOUIE, SG AF BLASE, X ZHU, XJ LOUIE, SG TI SELF-ENERGY EFFECTS ON THE SURFACE-STATE ENERGIES OF H-SI(111)1X1 SO PHYSICAL REVIEW B LA English DT Article ID EXCHANGE-CORRELATION POTENTIALS; TERMINATED SI(111) SURFACE; BAND-GAPS; HYDROGEN CHEMISORPTION; SEMICONDUCTORS; VIBRATION; INSULATORS; ELECTRON; PSEUDOPOTENTIALS; PHOTOEMISSION AB We have calculated the quasiparticle energy of the occupied surface states of the H-Si(111)1x1 surface. The electron self-energy operator is expanded to first order in the screened Coulomb interaction in the GW approximation. The results explain the data from recent high-resolution angle-resolved photoemission spectroscopy. Comparison of the quasiparticle surface-state energies with those from local-density-functional eigenvalues shows that the self-energy corrections are very large, typically two to three times larger than the corrections found in previous calculations on other semiconductor surface systems. We have also performed a frozen-phonon study of the stretching mode of the Si-H bond. As observed in several recent experiments and theoretical studies, a large anharmonicity is found. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP BLASE, X (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 48 TC 57 Z9 57 U1 1 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 FEB 15 PY 1994 VL 49 IS 7 BP 4973 EP 4980 DI 10.1103/PhysRevB.49.4973 PG 8 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800073 ER PT J AU JOHNSON, PD MA, YJ AF JOHNSON, PD MA, YJ TI BAND-STRUCTURE AND X-RAY RESONANT INELASTIC-SCATTERING SO PHYSICAL REVIEW B LA English DT Note ID DIAMOND AB We present the results of a tight-binding calculation of the soft-x-ray emission spectra obtained in an earlier study of resonant inelastic scattering of x rays at the carbon k edge of diamond. The close agreement between the calculated spectra and the experimental observations lends support to a picture of momentum conservation restricting the emission process to the same point in the Brillouin zone sampled by the initial excitation. We thus demonstrate qualitatively the feasibility of band-structure determinations with this technique. C1 UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP JOHNSON, PD (reprint author), BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 9 TC 45 Z9 45 U1 2 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 FEB 15 PY 1994 VL 49 IS 7 BP 5024 EP 5027 DI 10.1103/PhysRevB.49.5024 PG 4 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800080 ER PT J AU WANG, Y STOCKS, GM FAULKNER, JS AF WANG, Y STOCKS, GM FAULKNER, JS TI GENERAL-METHOD FOR EVALUATING SHAPE TRUNCATION FUNCTIONS OF VORONOI POLYHEDRA SO PHYSICAL REVIEW B LA English DT Note ID MULTIPLE-SCATTERING APPROACH; BAND-THEORY; POTENTIALS AB A general method is presented for evaluating shape-truncation functions of arbitrary Voronoi polyhedra. Unlike some other methods developed in recent years, the method described here does not demand any particular knowledge about a Voronoi polyhedron other than the position of the set of possible boundary planes. Besides its generality, the accuracy and efficiency of our method are also demonstrated. C1 FLORIDA ATLANTIC UNIV, ALLOY RES CTR, BOCA RATON, FL 33431 USA. FLORIDA ATLANTIC UNIV, DEPT PHYS, BOCA RATON, FL 33431 USA. RP OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 16 TC 11 Z9 11 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1994 VL 49 IS 7 BP 5028 EP 5031 DI 10.1103/PhysRevB.49.5028 PG 4 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800081 ER PT J AU YU, KM COHEN, ML HALLER, EE HANSEN, WL LIU, AY WU, IC AF YU, KM COHEN, ML HALLER, EE HANSEN, WL LIU, AY WU, IC TI OBSERVATION OF CRYSTALLINE C3N4 SO PHYSICAL REVIEW B LA English DT Note ID SOLIDS; FILMS AB We present strong experimental evidence suggesting that we have synthesized the beta-C3N4 phase. This is a material predicted by theory to have bulk moduli comparable to diamond. Thin films containing small crystals were deposited on Si and Ge wafers by rf diode sputtering of a pure graphite target with pure N2. The crystal structure of these phases was investigated using x-ray and electron-beam diffractometry as well as transmission electron microscopy. Our results indicate that the beta-C3N4 particles with typical dimensions of approximately 0.5 mum are embedded in a 1-mum-thick layer of a C-N polymer. These particles are believed to crystallize preferentially on Si (100) wafers. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. RP LAWRENCE BERKELEY LAB, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. RI Yu, Kin Man/J-1399-2012; Liu, Amy/E-2266-2015 OI Yu, Kin Man/0000-0003-1350-9642; Liu, Amy/0000-0002-2011-1854 NR 10 TC 511 Z9 545 U1 3 U2 67 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 FEB 15 PY 1994 VL 49 IS 7 BP 5034 EP 5037 DI 10.1103/PhysRevB.49.5034 PG 4 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800083 ER PT J AU SMITH, AP BENEDEK, R TROUW, FR YANG, LH AF SMITH, AP BENEDEK, R TROUW, FR YANG, LH TI ATOMIC POTENTIALS FOR RB-GRAPHITE AND K-GRAPHITE INTERCALATION COMPOUNDS SO PHYSICAL REVIEW B LA English DT Note ID X-RAY DETERMINATION; LIQUID; SUBSTRATE; DYNAMICS AB Intercalant-pair and corrugation potentials for stage-I and stage-2 Rb and K graphite intercalation compounds (GIC's) were calculated within the local-density-functional-theory framework. The predicted corrugation potential for the stage-2 Rb GIC is in excellent agreement with potentials derived from x-ray experiments, although some discrepancy was found for the stage-2 K GIC. The potentials for stage-2 Rb GIC were tested by molecular-dynamics simulations of the wave-vector-dependent neutron-scattering quasielastic linewidth for the Rb GIC, which is found to be in close accord with experiment. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. LAWRENCE LIVERMORE NATL LAB, DIV PHYS H, LIVERMORE, CA 94551 USA. OI Smith, Arthur/0000-0002-6035-7736 NR 29 TC 3 Z9 3 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1994 VL 49 IS 7 BP 5050 EP 5053 DI 10.1103/PhysRevB.49.5050 PG 4 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800087 ER PT J AU RUBIO, A CORKILL, JL COHEN, ML AF RUBIO, A CORKILL, JL COHEN, ML TI THEORY OF GRAPHITIC BORON-NITRIDE NANOTUBES SO PHYSICAL REVIEW B LA English DT Note ID FULLERENE TUBULES; CARBON NANOTUBES AB Based upon the similarities in properties between carbon- and BN-based (BN=boron nitride) materials, we propose that BN-based nanotubes can be stable and study their electronic structure. A simple Slater-Koster tight-binding scheme has been applied. All the BN nanotubes are found to be semiconducting materials. The band gaps are larger than 2 eV for most tubes. Depending on the helicity, the calculated band gap can be direct at GAMMA or indirect. In general, the larger the diameter of the nanotube the larger the band gap, with a saturation value corresponding to the calculated local-density-approximation band gap of hexagonal BN. The higher ionicity of BN is important in explaining the electronic differences between these tubes and similar carbon nanotubes. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP RUBIO, A (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Rubio, Angel/A-5507-2008 OI Rubio, Angel/0000-0003-2060-3151 NR 18 TC 1131 Z9 1162 U1 18 U2 159 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 FEB 15 PY 1994 VL 49 IS 7 BP 5081 EP 5084 DI 10.1103/PhysRevB.49.5081 PG 4 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800095 ER PT J AU DAVIDS, PS WANG, L SAXENA, A BISHOP, AR AF DAVIDS, PS WANG, L SAXENA, A BISHOP, AR TI COLLECTIVE LEVEL-CROSSINGS ON NANOTUBES AND MULTIPOLE EXCITATIONS ON FULLERENES SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; C-60; C60; CLUSTERS; CARBON AB A meshlike energy structure of collective intersubband excitations and damped collective energy level crossings are predicted for electrons confined on a cylindrical graphitic nanotube. Unusual Kohn anomalies, besides 2k(F), are found for nanotubes. Multipole collective excitations are obtained for C60 and related quasispherical fullerenes, and the results are in excellent agreement with available experimental measurements. RP DAVIDS, PS (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Davids, Paul/D-1550-2010 NR 18 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1994 VL 49 IS 8 BP 5682 EP 5686 DI 10.1103/PhysRevB.49.5682 PG 5 WC Physics, Condensed Matter SC Physics GA MY972 UT WOS:A1994MY97200065 ER PT J AU ABNEY, M AF ABNEY, M TI HYDRODYNAMIC DETONATION INSTABILITY IN ELECTROWEAK AND QCD PHASE-TRANSITIONS SO PHYSICAL REVIEW D LA English DT Article ID BUBBLE-GROWTH; NUCLEATION; WAVES AB The hydrodynamic stability of deflagration and detonation bubbles for a first order electroweak and QCD phase transition has been discussed recently with the suggestion that detonations are stable. We examine here the case of a detonation more carefully. We find that in front of the bubble wall perturbations do not grow with time, but behind the wall modes exist which grow exponentially. We briefly discuss the possible meaning of this instability. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP ABNEY, M (reprint author), UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637, USA. NR 19 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1994 VL 49 IS 4 BP 1777 EP 1782 DI 10.1103/PhysRevD.49.1777 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY971 UT WOS:A1994MY97100011 ER PT J AU COPELAND, EJ KOLB, EW LIDDLE, AR LIDSEY, JE AF COPELAND, EJ KOLB, EW LIDDLE, AR LIDSEY, JE TI RECONSTRUCTING THE INFLATON POTENTIAL - PERTURBATIVE RECONSTRUCTION TO 2ND-ORDER SO PHYSICAL REVIEW D LA English DT Article ID GRAVITATIONAL-WAVES; INFLATIONARY UNIVERSE; EXTENDED INFLATION; COBE; FLATNESS; SCENARIO; HORIZON AB One method to reconstruct the scalar field potential of inflation is a perturbative approach, where the values of the potential and its derivatives are calculated as an expansion in departures from the slow-roll approximation. They can then be expressed in terms of observable quantities, such as the square of the ratio of the gravitational wave amplitude to the density perturbation amplitude, the deviation of the spectral index from the Harrison-Zel'dovich value, etc. Here, we calculate complete expressions for the second-order contributions to the coefficients of the expansion by including for the first time corrections to the standard expressions for the perturbation spectra. As well as offering an improved result, these corrections indicate the expected accuracy of the reconstruction. Typically the corrections are only a few percent. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP COPELAND, EJ (reprint author), UNIV SUSSEX,SCH MATH & PHYS SCI,CTR ASTRON,BRIGHTON BN1 9QH,E SUSSEX,ENGLAND. NR 28 TC 72 Z9 72 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 FEB 15 PY 1994 VL 49 IS 4 BP 1840 EP 1844 DI 10.1103/PhysRevD.49.1840 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY971 UT WOS:A1994MY97100014 ER PT J AU GAILLARD, MK JAIN, V AF GAILLARD, MK JAIN, V TI SUPERGRAVITY COUPLED TO CHIRAL MATTER AT ONE-LOOP SO PHYSICAL REVIEW D LA English DT Article ID EFFECTIVE FIELD-THEORIES; = 1 SUPERGRAVITY; RADIATIVE-CORRECTIONS; SIGMA-MODELS; SUPERSYMMETRY BREAKING; DIMENSIONAL REDUCTION; COUPLINGS; COMPACTIFICATIONS; SUPERSTRINGS; HIERARCHY AB We extend earlier calculations of the one-loop contributions to the effective Bose Lagrangian in supergravity coupled to chiral matter. We evaluate all logarithmically divergent contributions for arbitrary background scalar fields and space-time metrics. We show that, with a judicious choice of gauge fixing and of the definition of the action expansion, much of the result can be absorbed into a redefinition of the metric and a renormalization of the Kahler potential. Most of the remaining terms depend on the curvature of the Kahler metric. Further simplification occurs in models obtained from superstrings in which the Kahler Riemann tensor is covariantly constant. C1 LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. RP GAILLARD, MK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 39 TC 51 Z9 51 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 FEB 15 PY 1994 VL 49 IS 4 BP 1951 EP 1965 DI 10.1103/PhysRevD.49.1951 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY971 UT WOS:A1994MY97100026 ER PT J AU HYER, T AF HYER, T TI INSTANTANEOUS INTERACTIONS OF HADRONS ON THE LIGHT-CONE SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM AB Hadron wave functions are most naturally defined in the framework of light-cone quantization, a Hamiltonian formulation quantized at equal light-cone ''time'' tau = t + z. One feature of the light-cone perturbation theory is the presence of instantaneous interactions, which complicate the consideration of processes involving bound states. We show that these interactions can be written in a simple and general form, parametrized by an instantaneous contribution psi to the hadronic wave function. We use the rotational invariance of Feynman diagrams to relate this instantaneous piece of the meson wave function to the propagating part, and to obtain constraints relating wave functions and quark fragmentation amplitudes. RP HYER, T (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1994 VL 49 IS 4 BP 2074 EP 2080 DI 10.1103/PhysRevD.49.2074 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY971 UT WOS:A1994MY97100038 ER PT J AU DAVIDSON, S PESKIN, M AF DAVIDSON, S PESKIN, M TI ASTROPHYSICAL BOUNDS ON MILLICHARGED PARTICLES IN MODELS WITH A PARAPHOTON SO PHYSICAL REVIEW D LA English DT Note ID PRIMORDIAL NUCLEOSYNTHESIS; MINICHARGED PARTICLES; ELECTRIC CHARGE; CONSTRAINTS AB The upper bound on the number of relativistic species present at nucleosynthesis has been used to constrain particles with electric charge epsilone (10(-8) < epsilon < 1). We correct the bound previously calculated for millicharged particles that interact with a shadow photon. We also discuss the additional constraints from the properties of red giants and of Supernova 1987A. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP DAVIDSON, S (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 15 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1994 VL 49 IS 4 BP 2114 EP 2117 DI 10.1103/PhysRevD.49.2114 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MY971 UT WOS:A1994MY97100042 ER PT J AU CONRADSON, SD BURGESS, BK NEWTON, WE DICICCO, A FILIPPONI, A WU, ZY NATOLI, CR HEDMAN, B HODGSON, KO AF CONRADSON, SD BURGESS, BK NEWTON, WE DICICCO, A FILIPPONI, A WU, ZY NATOLI, CR HEDMAN, B HODGSON, KO TI SELENOL BINDS TO IRON IN NITROGENASE IRON-MOLYBDENUM COFACTOR - AN EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDY SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE AZOTOBACTER VINELANDII; GNXAS ID AZOTOBACTER-VINELANDII NITROGENASE; SITE-DIRECTED MUTAGENESIS; F-19 CHEMICAL-SHIFTS; KLEBSIELLA-PNEUMONIAE; MOFE PROTEIN; ALPHA-SUBUNIT; FEMO-COFACTOR; EXAFS; CLUSTER; EDGE AB The biological N-2-fixation reaction is catalyzed by the enzyme nitrogenase. The metal cluster active site of this enzyme, the iron-molybdenum cofactor (FeMoco), can be studied either while bound within the MoFe protein component Of nitrogenase or after it has been extracted into N-methylformamide. The two species are similar but not identical. For example, the addition of thiophenol or selenophenol to isolated FeMoco causes its rather broad S = 3/2 electron paramagnetic resonance Signal to sharpen and more closely approach the signal exhibited by protein-bound FeMoco. The nature of this thiol/selenol binding site has been investigated by using Se-K edge extended x-ray absorption fine structure (EXAFS) to study selenophenol ligated to FeMoco, and the results are reported here. EXAFS data analysis at the ligand Se-K edge was performed with a set of software, GNXAS, that provides for direct calculation of the theoretical EXAFS signals and least-squares fits to the experimental data. Data analysis results show definitively that the selenol (and by inference thiol) binds to Fe at a distance of 2.4 Angstrom. In contrast, unacceptable fits are obtained with either Mo or S as the liganded atom (instead of Fe). These results provide quantitative details about an exchangeable thiol/selenol binding site on FeMoco in its isolated, solution state and establish an Fe atom as the site of this reaction. Furthermore, the utility of ligand-based EXAFS as a probe of coordination in polynuclear metal clusters is demonstrated. C1 UNIV CALIF IRVINE,DEPT MOLEC BIOL & BIOCHEM,IRVINE,CA 92717. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. VIRGINIA POLYTECH INST & STATE UNIV,DEPT BIOCHEM,BLACKSBURG,VA 24061. UNIV AQUILA,DIPARTIMENTO FIS,I-67010 COPPITO,ITALY. STANFORD UNIV,SLAC,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV CAMERINO,DIPARTIMENTO MATEMAT & FIS,I-63032 CAMERINO,ITALY. RI Filipponi, Adriano/P-7796-2015 OI Filipponi, Adriano/0000-0002-3870-5853 FU NCRR NIH HHS [RR01209]; NIDDK NIH HHS [DK37255]; NIGMS NIH HHS [GM43144] NR 43 TC 29 Z9 29 U1 0 U2 6 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 FEB 15 PY 1994 VL 91 IS 4 BP 1290 EP 1293 DI 10.1073/pnas.91.4.1290 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MX210 UT WOS:A1994MX21000021 PM 8108404 ER PT J AU LIU, CT LEE, EH GEORGE, EP DUNCAN, AJ AF LIU, CT LEE, EH GEORGE, EP DUNCAN, AJ TI INTERGRANULAR FRACTURE TENDENCY IN NIAL DOPED WITH BORON AND CARBON SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-BOUNDARY CHEMISTRY; TEMPERATURE; DUCTILITY; TENSILE; ALLOYS; FEAL RP LIU, CT (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI George, Easo/L-5434-2014; OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 20 TC 23 Z9 24 U1 1 U2 4 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 FEB 15 PY 1994 VL 30 IS 4 BP 387 EP 392 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MN519 UT WOS:A1994MN51900001 ER PT J AU CHAUDHURI, J ALYAN, SM JANKOWSKI, AF AF CHAUDHURI, J ALYAN, SM JANKOWSKI, AF TI ANALYSIS OF NI/TI MULTILAYERS BY X-RAY-DIFFRACTION SO THIN SOLID FILMS LA English DT Article ID FILMS AB The chemical modulation, structure and strain in Ni/Ti multilayer thin films are analyzed using X-ray diffraction theories. The repeat period of the multilayers used in this study ranges from 1.3 x 10(-9) to 12.8 x 10(-9) m. The composition modulation is obtained by using a kinematical theory of X-ray diffraction. Interplanar spacings and the strain within each atomic layer are found by iteratively fitting the experimental X-ray diffraction curves with the simulated one from a dynamical theory of X-ray diffraction. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CHAUDHURI, J (reprint author), WICHITA STATE UNIV,DEPT MECH ENGN,WICHITA,KS 67208, USA. RI Chaudhuri, Jharna/E-8863-2013 NR 21 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD FEB 15 PY 1994 VL 239 IS 1 BP 79 EP 84 DI 10.1016/0040-6090(94)90111-2 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MX289 UT WOS:A1994MX28900012 ER PT J AU DEES, C TRAVIS, C AF DEES, C TRAVIS, C TI TRICHLOROACETATE STIMULATION OF LIVER DNA-SYNTHESIS IN MALE AND FEMALE MICE SO TOXICOLOGY LETTERS LA English DT Article DE MITOSIS; CARCINOGENESIS; TRICHLOROACETATE; PHARMACOKINETIC MODELING ID MACROMOLECULAR INTERACTIONS; MOUSE-LIVER; B6C3F1 MICE; INDUCTION; TRICHLOROETHYLENE; PHARMACOKINETICS; DICHLOROACETATE; METABOLITES; ACID; RATS AB Male and female B6C3F1 mice were given trichloroacetate (TCA) by gavage for 11 days. Livers from untreated male and female mice were unremarkable by histopathologic examination. In livers from mice receiving 1000 mg/kg body weight, the centrolobular hepatic cords showed slight changes, which included increased eosinophilic staining and rare apoptosis. Areas in the intermediate zone were noted where the architecture of the liver hepatic cords was subtly changed. The changes in cord architecture seemed to define nodular areas where cellular proliferation in animals treated with TCA had occurred. No histopathologic differences were noted between the livers of treated or control, male and female animals. Mitosis and DNA synthesis were examined using incorporation of [H-3]thymidine into liver cells. [H-3]Thymidine incorporation into extracted liver DNA of animals receiving TCA was significantly increased over controls in all treatment groups. Autoradiographic examination of liver sections showed that the incorporation of label in control animals was predominantly in peri-sinusoidal cells, whereas the majority of radiolabel incorporation in TCA-treated animals was found in intermediate zone cells that appeared to be mature hepatocytes. No outstanding differences in the distribution of radiolabel in the liver sections from male or Female mice were noted. When incorporation of [H-3]thymidine was quantified by enumeration of labeled liver cells following autoradiography, incorporation of the radiolabel into hepatocytes increased with the dose of TCA given but there was no increase in radiolabeI in peri-sinusoidal cells. Increased mitotic figures in intermediate zone cells resembling mature hepatocytes were noted in all mice treated with TCA. These results suggest that increased DNA synthesis and mitosis may contribute tumorigenesis by TCA. RP DEES, C (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,POB 2008,MS-6109-4500S,OAK RIDGE,TN 37831, USA. NR 17 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD FEB 15 PY 1994 VL 70 IS 3 BP 343 EP 355 DI 10.1016/0378-4274(94)90129-5 PG 13 WC Toxicology SC Toxicology GA MU122 UT WOS:A1994MU12200010 PM 8284802 ER PT J AU KURTZ, SR BIEFELD, RM DAWSON, LR BAUCOM, KC HOWARD, AJ AF KURTZ, SR BIEFELD, RM DAWSON, LR BAUCOM, KC HOWARD, AJ TI MIDWAVE (4 MU-M) INFRARED-LASERS AND LIGHT-EMITTING-DIODES WITH BIAXIALLY COMPRESSED INASSB ACTIVE REGIONS SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; VAPOR-PHASE EPITAXY; BAND-GAPS; INAS1-XSBX; ALLOYS; PHOTOLUMINESCENCE; SUPERLATTICE; STRAIN; SI AB Heterostructures with biaxially compressed, As-rich InAsSb are being investigated as active regions for midwave infrared emitters. InAs1-xSbx/In1-xGaxAs (x approximate to 0.1) strained-layer sublattices (SLSs), nominally lattice matched to InAs, were grown using metalorganic chemical vapor deposition. An SLS light-emitting diode was demonstrated which emitted at 3.6 mu m with 0.06% efficiency at 77 K. Optically pumped laser emission at 3.9 mu m was observed in a SLS/InPSb heterostructure. The laser had a maximum operating temperature of approximately 100 K. RP KURTZ, SR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 24 TC 79 Z9 79 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 14 PY 1994 VL 64 IS 7 BP 812 EP 814 DI 10.1063/1.111022 PG 3 WC Physics, Applied SC Physics GA MW310 UT WOS:A1994MW31000002 ER PT J AU WARREN, WL DIMOS, D AF WARREN, WL DIMOS, D TI PHOTOINDUCED HYSTERESIS CHANGES AND CHARGE TRAPPING IN BATIO3 DIELECTRICS SO APPLIED PHYSICS LETTERS LA English DT Article ID PHOTOREFRACTIVE BARIUM-TITANATE; PARAMAGNETIC DEFECTS; PLZT CERAMICS AB We have been able to observe intrinsic photoinduced changes in the hysteresis response of BaTiO3 single crystals by the application of ultraviolet (UV) light in combination with an applied bias. The amount of switchable polarization can be suppressed by over 90% by this UV/bias treatment. The photoferroelectric effects are reproducible, reversible, and stable. Electron paramagnetic resonance measurements were also made to characterize the charge trapping associated with these electrical effects. We find that isolated Fe sites are trap centers in these ceramics and it appears that the Fe3+ density can be correlated to the amount of switchable polarization. These results also suggest that BaTiO3 ceramics can be used as a medium to store optical images. RP WARREN, WL (reprint author), SANDIA NATL LABS,ADV MAT LAB,ALBUQUERQUE,NM 87106, USA. NR 20 TC 42 Z9 43 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 14 PY 1994 VL 64 IS 7 BP 866 EP 868 DI 10.1063/1.110978 PG 3 WC Physics, Applied SC Physics GA MW310 UT WOS:A1994MW31000020 ER PT J AU VERGHESE, S KARADI, C MEARS, CA ORENSTEIN, J RICHARDS, PL BARFKNECHT, AT AF VERGHESE, S KARADI, C MEARS, CA ORENSTEIN, J RICHARDS, PL BARFKNECHT, AT TI BROAD-BAND RESPONSE OF THE QUASI-PARTICLE CURRENT IN A SUPERCONDUCTING TUNNEL JUNCTION SO APPLIED PHYSICS LETTERS LA English DT Article AB We have measured the linear response of the quasiparticle current in a Nb/AlOx/Nb junction from 75-200 GHz. Picosecond pulses of millimeter wave radiation were generated by illuminating a photoconductive switch with a mode-locked laser. The pulses were coupled to the junction through an impedance-mismatched, planar lithographed antenna. The broadband response of the superconductor-insulator-superconductor junction was measured by monitoring changes in the de current induced by interfering two electrical pulses at the junction as a function of the time delay between them. The data are in agreement with the linear theory of photon-assisted tunneling. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. CONDUCTUS INC,SUNNYVALE,CA 94086. RI Orenstein, Joseph/I-3451-2015 NR 9 TC 5 Z9 5 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 FEB 14 PY 1994 VL 64 IS 7 BP 915 EP 917 DI 10.1063/1.110994 PG 3 WC Physics, Applied SC Physics GA MW310 UT WOS:A1994MW31000037 ER PT J AU SHIBUTANI, K WIESMANN, HJ SABATINI, RL SUENAGA, M HAYASHI, S OGAWA, R KAWATE, Y MOTOWIDLO, L HALDAR, P AF SHIBUTANI, K WIESMANN, HJ SABATINI, RL SUENAGA, M HAYASHI, S OGAWA, R KAWATE, Y MOTOWIDLO, L HALDAR, P TI COMPARATIVE-STUDY OF J(C)/H CHARACTERISTICS FOR SILVER-SHEATHED SUPERCONDUCTING BI(2/2/1/2) AND BI(2/2/2/3) TAPES SO APPLIED PHYSICS LETTERS LA English DT Article ID VORTEX-GLASS SUPERCONDUCTIVITY; BA-CU-O; WIRES AB Critical current densities J(c) of silver sheathed Bi2Sr2CaCu2O8, and Bi2Sr2Ca2Cu3O10 composite tapes fabricated by a partial melt and a powder-in-tube process, respectively, were measured at 4.2, 27, and 64 K as a function of applied magnetic field and the angle between the tape face and the direction of applied magnetic field. These measurements indicate that (1) the fraction of the grain boundaries, which are strongly coupled, are greater in the Bi(2:2:1:2)/Ag tapes than in the Bi(2:2:2:3)/Ag tapes; (2) the alignment of the Bi cuprate platelets with the c-axis perpendicular to the tape face is significantly greater for the Bi(2:2:1:2) than for the Bi(2:2:2:3)/Ag tapes; and (3) the E-J curves for both kinds of the tapes are described well by an expression, E similar to exp[-(J(0)/J)(mu)], where mu and J(0) are constants below their transition magnetic fields H-g* C1 KOBE STEEL LTD,CTR SUPERCONDUCTING & CRYOGEN TECHNOL,KOBE 65122,JAPAN. IGC ADV SUPERCONDUSTORS INC,WATERBURY,CT 06704. INTERMAGNET GEN CORP,GUILDERLAND,NY 12084. RP SHIBUTANI, K (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 13 TC 28 Z9 28 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 14 PY 1994 VL 64 IS 7 BP 924 EP 926 DI 10.1063/1.110997 PG 3 WC Physics, Applied SC Physics GA MW310 UT WOS:A1994MW31000040 ER PT J AU SMITH, AB GUENTHER, PT AF SMITH, AB GUENTHER, PT TI FAST-NEUTRON INTERACTION WITH COLLECTIVE CADMIUM NUCLEI SO NUCLEAR PHYSICS A LA English DT Article DE CD (N, N); (N, N'); E=1.5-10MEV; MEASURED SIGMA (THETA); DEDUCED SIGMA-(E); MODEL PARAMETERS; OPTICAL-STATISTICAL; DISPERSIVE-OPTICAL; COUPLED-CHANNELS ANALYSIS ID OPTICAL-MODEL; ELASTIC-SCATTERING; ENERGY-DEPENDENCE AB Differential neutron-Scattering cross sections of elemental cadmium are measured from approximately 1.5 to 10 MeV. From approximately 1.5 to 3.0 MeV the measurements are made at approximately 100 keV incident-neutron energy intervals and at 10 scattering angles distributed between almost-equal-to 20-degrees and 160-degrees. From 3 to 4 MeV the measurements are made at approximately 200 keV intervals and 20 angles. Above 4 MeV the interval is approximately 0.5 MeV with greater-than-or-equal-to 40 differential values at each energy, distributed between approximately 18-degrees and 160-degrees. Differential cross sections for the excitation of observed ''levels'' at 0.0 (elastic), 0.589 +/- 0.047, 1.291 +/- 0.066 and 1.839 +/- 0.057 MeV are determined, with attention to the direct excitation of the yrast 2+ levels of the even isotopes, and of the 3/2+ and 5/2+ levels of the odd isotopes. Optical-statistical, dispersive-optical and coupled-channels interpretations are carried out and comparisons made with ''global'' parameters. Consideration is given to the fundamental nature of the real potential in the vicinity of the Fermi surface with implications on the equation of state and the reduced mass. C1 UNIV ARIZONA,TUCSON,AZ 85721. RP SMITH, AB (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 56 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD FEB 14 PY 1994 VL 568 IS 2 BP 221 EP 243 DI 10.1016/0375-9474(94)90199-6 PG 23 WC Physics, Nuclear SC Physics GA MZ138 UT WOS:A1994MZ13800001 ER PT J AU FUESS, TA HAFEN, ES HARIDAS, P HULSIZER, RI LAINIS, T LEVY, A PLESS, IA SUNG, TW YAMAMOTO, RK WIDGOFF, M RATTI, S ALYEA, ED DIMARCO, R JACQUES, PF KALELKAR, M PLANO, RJ STAMER, P WATTS, TL AF FUESS, TA HAFEN, ES HARIDAS, P HULSIZER, RI LAINIS, T LEVY, A PLESS, IA SUNG, TW YAMAMOTO, RK WIDGOFF, M RATTI, S ALYEA, ED DIMARCO, R JACQUES, PF KALELKAR, M PLANO, RJ STAMER, P WATTS, TL TI DIFFRACTION DISSOCIATION IN PI(+)P INTERACTIONS AT 147 GEV/C SO NUCLEAR PHYSICS B LA English DT Article AB Single diffraction dissociation cross sections of both beam and target particles. have been measured in 147 GeV/c pi+p interactions. The data were recorded by the Fermilab Hybrid 30-inch Bubble Chamber Spectrometer. The diffraction dissociation events are recognized by leading particle signals above background. The pion dissociation cross section is 1895+/-108 mub. The proton dissociation cross section is 1880+/-143 mub. The results are compared to results of a similar study using 147 GeV/c pi-p interactions. These combined results are used to study factorization of the diffraction dissociation cross section. C1 BROWN UNIV,PROVIDENCE,RI 02912. UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR,I-27100 PAVIA,ITALY. INDIANA UNIV,BLOOMINGTON,IN 47401. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. US MIL ACAD,W POINT,NY 10996. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. ARETE ASSOCIATES,ARLINGTON,VA 22215. SETON HALL UNIV,S ORANGE,NJ 07079. RP FUESS, TA (reprint author), MIT,CAMBRIDGE,MA 02139, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD FEB 14 PY 1994 VL 414 IS 1-2 BP 3 EP 24 DI 10.1016/0550-3213(94)90418-9 PG 22 WC Physics, Particles & Fields SC Physics GA NA885 UT WOS:A1994NA88500001 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 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 VITTONE, M 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 FILASETTA, JF 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 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 VITTONE, M 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 FILASETTA, JF BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI OBSERVATION OF AN EXCITED-STATE OF THE LAMBDA(+)(C) BARYON SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUARK-MODEL AB An observation of an excited Lambda(c)(+*) baryon decaying to Lambda(c)(+)pi(+)pi(-), with Lambda(c)(+) --> pK(-)pi(+), is presented. We reconstruct 39.7+/-8.7 Lambda(c)(+*) baryons with a mass of 340.4+/-0.6+/-0.3 MeV/c(2) above the Lambda(c)(+) mass. The upper limit on the resonant branching ratio is B(Lambda(c)(+*) --> Sigma(c) pi(+/-))/B(Lambda(c)(+*) --> Lambda(c)(+)pi(+)pi(-)) < 36% at the 90% confidence level. C1 IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR,I-27100 PAVIA,ITALY. IST NAZL FIS NUCL,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV S CAROLINA,COLUMBIA,SC 29208. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV N CAROLINA,ASHEVILLE,NC 28804. NO KENTUCKY UNIV,HIGHLAND HTS,KY 41076. UNIV TENNESSEE,KNOXVILLE,TN 37996. KOREA UNIV,SEOUL 136701,SOUTH KOREA. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 9 TC 36 Z9 37 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 14 PY 1994 VL 72 IS 7 BP 961 EP 964 DI 10.1103/PhysRevLett.72.961 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600004 ER PT J AU ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALVAREZ, G ALVES, GA AMOS, N ANDERSON, EW ANTIPOV, Y ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BEHNKE, T BENDICH, J BERI, SB BEZZUBOV, V BHAT, PC BHATNAGAR, V BISWAS, N BLAZEY, G BLESSING, S BOEHNLEIN, A BORCHERDING, F BORDERS, J BOZKO, N BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, V BUTLER, JM CALLOT, OH CASTILLAVALDEZ, H CHAKRABORTY, D CHEKULAEV, S CHEN, J CHEN, LP CHEN, W CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, M CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, S DHARMARATNA, W DIEHL, HT DIESBURG, M DIXON, R DRAPER, P DUCROS, Y DURSTONJOHNSON, S EARTLY, D EDMUNDS, D EFIMOV, A ELLISON, J ELVIRA, VD ENGELMANN, R EPPLEY, G EROSHIN, O EVDOKIMOV, V FAHEY, S FANOURAKIS, G FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FLATTUM, E FORDEN, GE FORTNER, M FRANZINI, P FUESS, S GAO, CS GELD, TL GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLICENSTEIN, JF GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GOOD, ML GORDON, H GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GUIDA, JA GUIDA, JM GURYN, W HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HALL, RE HANSEN, S HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERRERACORRAL, G HEURING, T HIROSKY, R HOENEISEN, B HOFTUN, JS HU, T HUBBARD, JR HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JIANG, JZY JOFFEMINOR, T JOHNS, K JOHNSON, M JONCKHEERE, A JONES, M JOSTLEIN, H JUNG, CK KAHN, S KEHOE, R KELLY, M KERNAN, A KERTH, L KHOLODENKO, A KIRYUNIN, A KISTENEV, E KLATCHKO, A KLIMA, B KLOCHKOV, B KLOPFENSTEIN, C KLYUKHIN, V KOCHETKOV, V KOHLI, JM KOLTICK, D KOTCHER, J KOTOV, I KOURLAS, J KOZELOV, A KOZLOVSKY, E KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEEFRANZINI, J LI, H LI, J LI, R LIDEMARTEAU, QZ LIMA, JGR LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOCH, P LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANGEOT, P MANNING, I MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, HJ MARTIN, MI MARTIN, PS MARX, M MAY, B MAYOROV, A MCCARTHY, R MCKIBBEN, T MCKINLEY, J MENG, XC MERRITT, KW MIETTINEN, H MILDER, A MINCER, A MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NEAL, HA NEGRET, JP NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PANG, M PARA, A PARK, CH PARTRIDGE, R PATERNO, M PERYSHKIN, A PETERS, M PI, B PIEKARZ, R PISCHALNIKOV, Y PIZZUTO, D PLUQUET, A PODSTAVKOV, V POPE, BG PROSPER, HB PROTOPOPESCU, S QUE, YK QUINTAS, PZ RAHALCALLOT, G RAJA, R RAJAGOPALAN, S RAO, MVS RASMUSSEN, L READ, AL REPOND, S REUCROFT, S RIADOVIKOV, V RIJSSENBEEK, M ROE, NA RUBINOV, P RUCHTI, R RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHMID, D SCULLI, J SHKURENKOV, A SHUPE, M SINGH, JB SIROTENKO, V SKEENS, J SMART, W SMITH, A SMITH, D SMITH, RP SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, R STEVENSON, ML STEWART, D STOCKER, F STOYANOVA, D STREETS, K STROVINK, M SUHANOV, A TAKETANI, A TARTAGLIA, M TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VISHWANATH, PR VOLKOV, A VOROBIEV, A WAHL, HD WANG, DC WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WOLF, Z WOMERSLEY, J WOOD, DR XIA, Y XIAO, D XIE, P XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YANG, MJ YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J ZEITNITZ, C ZELLER, R ZHANG, S ZHU, Q ZHU, YS ZIEMINSKA, D ZIEMINSKI, A ZINCHENKO, A ZYLBERSTEJN, A AF ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALVAREZ, G ALVES, GA AMOS, N ANDERSON, EW ANTIPOV, Y ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BEHNKE, T BENDICH, J BERI, SB BEZZUBOV, V BHAT, PC BHATNAGAR, V BISWAS, N BLAZEY, G BLESSING, S BOEHNLEIN, A BORCHERDING, F BORDERS, J BOZKO, N BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, V BUTLER, JM CALLOT, OH CASTILLAVALDEZ, H CHAKRABORTY, D CHEKULAEV, S CHEN, J CHEN, LP CHEN, W CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, M CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, S DHARMARATNA, W DIEHL, HT DIESBURG, M DIXON, R DRAPER, P DUCROS, Y DURSTONJOHNSON, S EARTLY, D EDMUNDS, D EFIMOV, A ELLISON, J ELVIRA, VD ENGELMANN, R EPPLEY, G EROSHIN, O EVDOKIMOV, V FAHEY, S FANOURAKIS, G FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FLATTUM, E FORDEN, GE FORTNER, M FRANZINI, P FUESS, S GAO, CS GELD, TL GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLICENSTEIN, JF GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GOOD, ML GORDON, H GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GUIDA, JA GUIDA, JM GURYN, W HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HALL, RE HANSEN, S HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERRERACORRAL, G HEURING, T HIROSKY, R HOENEISEN, B HOFTUN, JS HU, T HUBBARD, JR HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JIANG, JZY JOFFEMINOR, T JOHNS, K JOHNSON, M JONCKHEERE, A JONES, M JOSTLEIN, H JUNG, CK KAHN, S KEHOE, R KELLY, M KERNAN, A KERTH, L KHOLODENKO, A KIRYUNIN, A KISTENEV, E KLATCHKO, A KLIMA, B KLOCHKOV, B KLOPFENSTEIN, C KLYUKHIN, V KOCHETKOV, V KOHLI, JM KOLTICK, D KOTCHER, J KOTOV, I KOURLAS, J KOZELOV, A KOZLOVSKY, E KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEEFRANZINI, J LI, H LI, J LI, R LIDEMARTEAU, QZ LIMA, JGR LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOCH, P LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANGEOT, P MANNING, I MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, HJ MARTIN, MI MARTIN, PS MARX, M MAY, B MAYOROV, A MCCARTHY, R MCKIBBEN, T MCKINLEY, J MENG, XC MERRITT, KW MIETTINEN, H MILDER, A MINCER, A MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NEAL, HA NEGRET, JP NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PANG, M PARA, A PARK, CH PARTRIDGE, R PATERNO, M PERYSHKIN, A PETERS, M PI, B PIEKARZ, R PISCHALNIKOV, Y PIZZUTO, D PLUQUET, A PODSTAVKOV, V POPE, BG PROSPER, HB PROTOPOPESCU, S QUE, YK QUINTAS, PZ RAHALCALLOT, G RAJA, R RAJAGOPALAN, S RAO, MVS RASMUSSEN, L READ, AL REPOND, S REUCROFT, S RIADOVIKOV, V RIJSSENBEEK, M ROE, NA RUBINOV, P RUCHTI, R RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHMID, D SCULLI, J SHKURENKOV, A SHUPE, M SINGH, JB SIROTENKO, V SKEENS, J SMART, W SMITH, A SMITH, D SMITH, RP SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, R STEVENSON, ML STEWART, D STOCKER, F STOYANOVA, D STREETS, K STROVINK, M SUHANOV, A TAKETANI, A TARTAGLIA, M TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VISHWANATH, PR VOLKOV, A VOROBIEV, A WAHL, HD WANG, DC WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WOLF, Z WOMERSLEY, J WOOD, DR XIA, Y XIAO, D XIE, P XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YANG, MJ YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J ZEITNITZ, C ZELLER, R ZHANG, S ZHU, Q ZHU, YS ZIEMINSKA, D ZIEMINSKI, A ZINCHENKO, A ZYLBERSTEJN, A TI FIRST GENERATION LEPTOQUARK SEARCH IN P(P)OVER-BAR COLLISIONS AT ROOT-8=1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCALAR LEPTOQUARKS; HADRON COLLIDERS; Z0 DECAYS AB We report on a search for first generation leptoquarks with the Dnull set detector at the Fermilab Tevatron collider at root s = 1.8 TeV. This search is based on 15 pb(-1) of data. Leptoquarks are assumed to be produced in pairs and to decay into an electron + quark with branching ratio P. No leptoquark candidates were found. We obtain cross section times branching ratio limits as a function of leptoquark mass. For pair production of scalar leptoquarks, we set a leptoquark mass limit of 133 GeV for beta = 1 and 120 GeV for beta = 0.5 at 95% confidence level. C1 UNIV LOS ANDES,BOGOTA,COLOMBIA. UNIV ARIZONA,TUCSON,AZ 85721. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,RIO JANEIRO,RJ,BRAZIL. CINVESTAV IPN,MEXICO CITY,DF,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV FLORIDA,GAINESVILLE,FL 32611. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHICAGO,IL 60680. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,COLL PK,MD 20742. MICHIGAN STATE UNIV,E LANSING,MI 48824. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PANJAB,CHANDIGARH 160014,CHANDIGARH,INDIA. PROTVINO HIGH ENERGY PHYS INST,PROTVINO 142284,RUSSIA. UNIV MICHIGAN,ANN ARBOR,MI 48109. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77251. UNIV ROCHESTER,ROCHESTER,NY 14627. CTR ETUD SACLAY,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. SUNY STONY BROOK,STONY BROOK,NY 11794. SSC LAB,DALLAS,TX 75237. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLL STN,TX 77843. RP ABACHI, S (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Aihara, Hiroaki/F-3854-2010; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Chekulaev, Sergey/O-1145-2015; Taketani, Atsushi/E-1803-2017 OI Aihara, Hiroaki/0000-0002-1907-5964; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Taketani, Atsushi/0000-0002-4776-2315 NR 24 TC 42 Z9 42 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 FEB 14 PY 1994 VL 72 IS 7 BP 965 EP 969 DI 10.1103/PhysRevLett.72.965 PG 5 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600005 ER PT J AU DOBACZEWSKI, J HAMAMOTO, I NAZAREWICZ, W SHEIKH, JA AF DOBACZEWSKI, J HAMAMOTO, I NAZAREWICZ, W SHEIKH, JA TI NUCLEAR SHELL STRUCTURE AT PARTICLE DRIP LINES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MASS FORMULA AB The shell structure of exotic nuclei near proton and neutron drip lines is discussed in terms of the self-consistent mean-field theory. It is demonstrated that when approaching the neutron drip line, the neutron density becomes very diffused and the single-particle spectrum shows similarities to that of the harmonic oscillator with spin-orbit term. Interaction between bound orbitals and continuum is shown to result in quenching of shell effects in light and medium systems. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. WARSAW UNIV,INST THEORET PHYS,PL-00681 WARSAW,POLAND. LUND INST TECHNOL,DEPT MATH PHYS,S-22100 LUND,SWEDEN. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. RP DOBACZEWSKI, J (reprint author), OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,POB 2008,OAK RIDGE,TN 37831, USA. NR 23 TC 311 Z9 313 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 14 PY 1994 VL 72 IS 7 BP 981 EP 984 DI 10.1103/PhysRevLett.72.981 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600009 ER PT J AU WANG, Y SOKOL, PE AF WANG, Y SOKOL, PE TI KINETIC-ENERGY AND CONDENSATE FRACTION IN HE-3-HE-4 MIXTURES SO PHYSICAL REVIEW LETTERS LA English DT Article ID INELASTIC NEUTRON-SCATTERING; LIQUID-HE-4; HE-4 AB Deep inelastic neutron scattering measurements have been carried out to measure the kinetic energy and condensate fraction in liquid He-3-He-4 mixtures. Samples with He-3 concentration on the order of 10% were studied at 1.4 K and 2.3-2.5 K. The condensate fraction was found to be 0.18 +/- 0.03, much larger than theoretical predictions. The measured kinetic energies of the He-3 and He-4 in the mixture remain the same as their values in the pure phase, in disagreement with current theoretical predictions. C1 PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. RP WANG, Y (reprint author), ARGONNE NATL LAB,INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439, USA. NR 25 TC 32 Z9 32 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 FEB 14 PY 1994 VL 72 IS 7 BP 1040 EP 1043 DI 10.1103/PhysRevLett.72.1040 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600024 ER PT J AU EMIN, D AF EMIN, D TI PHONON-MEDIATED ATTRACTION BETWEEN LARGE BIPOLARONS - CONDENSATION TO A LIQUID SO PHYSICAL REVIEW LETTERS LA English DT Article ID TEMPERATURE; SUPERCONDUCTIVITY AB Self-trapped carriers of large bipolarons are redistributed among sites of their molecular orbitals in response to atomic motions. This effect lowers the phonon frequencies. The dependence of the zero-point energy on the spatial distribution of large bipolarons produces a phonon-mediated attraction between them. This dynamic quantum-mechanical effect fosters the condensation of large bipolarons into a liquid at sufficiently low temperatures. RP EMIN, D (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 14 PY 1994 VL 72 IS 7 BP 1052 EP 1055 DI 10.1103/PhysRevLett.72.1052 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600027 ER PT J AU KWOK, WK FENDRICH, J WELP, U FLESHLER, S DOWNEY, J CRABTREE, GW AF KWOK, WK FENDRICH, J WELP, U FLESHLER, S DOWNEY, J CRABTREE, GW TI SUPPRESSION OF THE FIRST-ORDER VORTEX MELTING TRANSITION BY INTRINSIC PINNING IN YBA2CU3O7-DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINGLE-CRYSTALS; GLASS SUPERCONDUCTIVITY; LAYERED SUPERCONDUCTORS; II SUPERCONDUCTORS; PHASE-TRANSITIONS; FLUX-LATTICE; DISORDER; FIELD AB The first order vortex melting transition in single crystal YBa2Cu3O7-delta is investigated for magnetic field direction close to H parallel to ab. For exact field alignment H parallel to ab, the ''kink'' in p(T) associated with the first order melting transition is replaced with a continuous resistive transition in the presence of intrinsic pinning, indicative of a second order transition with dynamic scaling exponent s=1.4. In addition, we demonstrate the abatement of the ''kink'' in the temperature dependence of the magnetoresistivity, associated with the first order melting transition for H parallel to c in the presence of only six twin boundaries. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RP KWOK, WK (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 27 TC 151 Z9 152 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 FEB 14 PY 1994 VL 72 IS 7 BP 1088 EP 1091 DI 10.1103/PhysRevLett.72.1088 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600036 ER PT J AU KWOK, WK FENDRICH, J FLESHLER, S WELP, U DOWNEY, J CRABTREE, GW AF KWOK, WK FENDRICH, J FLESHLER, S WELP, U DOWNEY, J CRABTREE, GW TI VORTEX LIQUID DISORDER AND THE FIRST-ORDER MELTING TRANSITION IN YBA2CU3O7-DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINGLE-CRYSTAL YBA2CU3O7; HIGH-TC SUPERCONDUCTORS; FLUX-LATTICE; RESISTIVITY; STATE AB We present transport measurements in high quality untwinned crystals of YBa2Cu3O7-delta in fields up to 8 T. We find an extremely sharp resistive transition at the first order vortex freezing transition T-m, with width much narrower than the zero field transition width. The resistive transition as a function of magnetic held is equally sharp with freezing occurring within 10 Oe in a field of about 6 T. There is dramatic asymmetric hysteresis in the field dependence of the resistivity related to the unpinned nature of the vortex liquid state. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP KWOK, WK (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 16 TC 186 Z9 186 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 14 PY 1994 VL 72 IS 7 BP 1092 EP 1095 DI 10.1103/PhysRevLett.72.1092 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600037 ER PT J AU GREVEN, M BIRGENEAU, RJ ENDOH, Y KASTNER, MA KEIMER, B MATSUDA, M SHIRANE, G THURSTON, TR AF GREVEN, M BIRGENEAU, RJ ENDOH, Y KASTNER, MA KEIMER, B MATSUDA, M SHIRANE, G THURSTON, TR TI SPIN CORRELATIONS IN THE 2D HEISENBERG-ANTIFERROMAGNET SR2CUO2CL2 - NEUTRON-SCATTERING, MONTE-CARLO SIMULATION, AND THEORY SO PHYSICAL REVIEW LETTERS LA English DT Article ID LOW-TEMPERATURES; DYNAMICS; LA2CUO4; EXCITATIONS; PURE AB We report a neutron scattering study of the spin correlations in the model 2D, S = 1/2, square-lattice Heisenberg antiferromagnet Sr2CuO2Cl2. The spin correlation lengths obtained agree quantitatively with values deduced from Monte Carlo simulations over a wide range of temperature. The combined data, which cover the length scale from 1 to 200 lattice constants, are predicted accurately with no adjustable parameters by renormalized classical theory for the quantum nonlinear sigma model. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. RP GREVEN, M (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 19 TC 112 Z9 112 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 14 PY 1994 VL 72 IS 7 BP 1096 EP 1099 DI 10.1103/PhysRevLett.72.1096 PG 4 WC Physics, Multidisciplinary SC Physics GA MW256 UT WOS:A1994MW25600038 ER PT J AU HEESEPECK, A KOVALEVA, V RAIKHEL, NV AF HEESEPECK, A KOVALEVA, V RAIKHEL, NV TI IDENTIFICATION OF PROTEINS CONTAINING N-ACETYL-GLUCOSAMINE AT THE PLANT NUCLEAR-PORE COMPLEX SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 89 EP 89 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500311 ER PT J AU KRAUSS, SW AF KRAUSS, SW TI NUCLEAR ISOFORMS OF STRUCTURAL PROTEIN-4.1 SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,DEPT CELL & MOLEC BIOL,DIV LIFE SCI,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 95 EP 95 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500334 ER PT J AU DONG, XF YAU, P BRADBURY, EM AF DONG, XF YAU, P BRADBURY, EM TI STUDIES OF LINKER HISTONE VARIANTS INDUCED DNA LINKING NUMBER CHANGE IN RECONSTITUTED MINICHROMOSOMES SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF DAVIS,DEPT BIOL CHEM,DAVIS,CA 95616. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. NR 1 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 99 EP 99 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500351 ER PT J AU STAMPFER, M ALEXANDER, D HOSODA, J PAN, CH YASWEN, P AF STAMPFER, M ALEXANDER, D HOSODA, J PAN, CH YASWEN, P TI TGP-BETA EFFECTS ON CELL-CYCLE PROGRESSION OF NORMAL AND IMMORTAL HUMAN MAMMARY EPITHELIAL-CELLS IN CULTURE SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 182 EP 182 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500645 ER PT J AU WOLOSCHAK, GE CHURCHILL, ME ZHANG, YR GEMMELL, MA AF WOLOSCHAK, GE CHURCHILL, ME ZHANG, YR GEMMELL, MA TI DETECTION OF RETINOBLASTOMA GENE DELETIONS IN RADIATION-INDUCED MOUSE LUNG ADENOCARCINOMAS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 193 EP 193 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500689 ER PT J AU REITZ, M ROBERTGUROFF, M DIMARZOVERONESE, F LOUIE, A WATKINS, B GUPTA, G LUSSO, P GALLO, RC AF REITZ, M ROBERTGUROFF, M DIMARZOVERONESE, F LOUIE, A WATKINS, B GUPTA, G LUSSO, P GALLO, RC TI CONFORMATIONAL ASPECTS OF V3 IN HIV-1 NEUTRALIZATION SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 NCI,LTCB,BETHESDA,MD 20892. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. NR 0 TC 0 Z9 0 U1 1 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 217 EP 217 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500772 ER PT J AU ROSKELLEY, C BISSELL, MJ AF ROSKELLEY, C BISSELL, MJ TI SIGNAL-TRANSDUCTION BY EXTRACELLULAR-MATRIX UTILIZES BOTH CELL SHAPE-DEPENDENT AND CELL SHAPE-INDEPENDENT PROCESSES SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 237 EP 237 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500844 ER PT J AU BAIRD, B GOLDSTEIN, B POSNER, R SUBRAMANIAN, K HASHEMI, B HOLOWKA, D AF BAIRD, B GOLDSTEIN, B POSNER, R SUBRAMANIAN, K HASHEMI, B HOLOWKA, D TI DYNAMICS OF LIGANDS BINDING TO AND CROSS-LINKING OF IMMUNO-RECEPTORS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 CORNELL UNIV,ITHACA,NY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. NO ARIZONA UNIV,FLAGSTAFF,AZ 86011. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 241 EP 241 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500855 ER PT J AU POSNER, R GOLDSTEIN, B SUBRAMANIAN, K HOLOWKA, D BAIRD, B AF POSNER, R GOLDSTEIN, B SUBRAMANIAN, K HOLOWKA, D BAIRD, B TI SIMULTANEOUS CROSS-LINKING BY 2 BIVALENT LIGANDS RESULTS IN SYNERGISTIC SIGNALING OF IGE-RECEPTOR COMPLEXES - EVIDENCE FOR THE IMPORTANCE OF CROSS-LINKING DYNAMICS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 NO ARIZONA UNIV,FLAGSTAFF,AZ 86011. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. CORNELL UNIV,ITHACA,NY. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 246 EP 246 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500873 ER PT J AU SUBRAMANIAN, K POSNER, R GOLDSTEIN, B HOLOWKA, D BAIRD, B AF SUBRAMANIAN, K POSNER, R GOLDSTEIN, B HOLOWKA, D BAIRD, B TI KINETICS OF CROSS-LINKING ANTI-DNP IGE AND ANTI-DNP FAB' IN SOLUTION BY SYMMETRICAL BIVALENT LIGAND SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 CORNELL UNIV,ITHACA,NY. NO ARIZONA UNIV,FLAGSTAFF,AZ 86011. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 246 EP 246 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500874 ER PT J AU ROSKELLEY, C BISSELL, MJ AF ROSKELLEY, C BISSELL, MJ TI SIGNAL-TRANSDUCTION BY EXTRACELLULAR-MATRIX UTILIZES BOTH CELL SHAPE-DEPENDENT AND CELL SHAPE-INDEPENDENT PROCESSES SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 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 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 267 EP 267 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500944 ER PT J AU KESHAVAMURTHY, S MILLER, WH AF KESHAVAMURTHY, S MILLER, WH TI SEMICLASSICAL CORRECTION FOR QUANTUM-MECHANICAL SCATTERING SO CHEMICAL PHYSICS LETTERS LA English DT Article ID REACTIVE SCATTERING; S-MATRIX; APPROXIMATION; DYNAMICS; BATH AB A straightforward theoretical prescription is described for combining any approximate quantum scattering calculation with a semi-classical correction. The correction involves the standard semi-classical approximation to the time evolution operator, so that only real time trajectories are needed; by transforming to an initial value representation the calculations require only an average over the phase space of initial conditions. To the extent that the semi-classical approximation is accurate, the net result for the S matrix is exact. Application to one-dimensional barrier transmission shows the semi-classical approximation to do a very good job, for energies above, near to, or far below the barrier. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP KESHAVAMURTHY, S (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 29 TC 85 Z9 85 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 11 PY 1994 VL 218 IS 3 BP 189 EP 194 DI 10.1016/0009-2614(93)E1485-Y PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MV913 UT WOS:A1994MV91300002 ER PT J AU HAGLER, TW AF HAGLER, TW TI NONPARALLEL TRANSITION DIPOLE-MOMENTS AND THE POLARIZATION DEPENDENCE OF ELECTROABSORPTION IN NONORIENTED CONJUGATED POLYMER-FILMS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID POLYACETYLENE AB We present a comprehensive analysis of the polarization dependence of the field-induced absorption in nonoriented conjugated polymer films. The results demonstrate that the polarization anisotropy of the field-induced absorption is directly related to the relative angle, Delta phi(d), between the dominant one-photon and two-photon transition dipole moments responsible for the nonlinear effect. The polarization anisotropy has a maximum value of 3: 1 for parallel transition dipole moments, and a minimum value of 1:3 for perpendicular transition dipole moments. We demonstrate that the predicted field-induced absorption anisotropy is consistent with Kleinmann symmetry for any relative orientation of the dominant transition dipole moments. RP HAGLER, TW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 4 Z9 4 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 11 PY 1994 VL 218 IS 3 BP 195 EP 199 DI 10.1016/0009-2614(93)E1486-Z PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MV913 UT WOS:A1994MV91300003 ER PT J AU OH, BH KANG, CH DEBONDT, H KIM, SH NIKAIDO, K JOSHI, AK AMES, GFL AF OH, BH KANG, CH DEBONDT, H KIM, SH NIKAIDO, K JOSHI, AK AMES, GFL TI THE BACTERIAL PERIPLASMIC HISTIDINE-BINDING PROTEIN - STRUCTURE/FUNCTION ANALYSIS OF THE LIGAND-BINDING SITE AND COMPARISON WITH RELATED PROTEINS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID ESCHERICHIA-COLI; SALMONELLA-TYPHIMURIUM; TRANSPORT-SYSTEMS; ACTIVE-TRANSPORT; RESOLUTION STRUCTURE; AGROBACTERIUM-TUMEFACIENS; MALTOSE TRANSPORT; ARGININE-BINDING; LYSINE-BINDING; X-RAY AB Bacterial periplasmic binding proteins are initial receptors in the process of active transport across cell membranes and/or chemotaxis. Among them, the histidine-binding protein (HisJ) has been extensively studied from the biochemical, physiological, and genetic points of view. The three dimensional crystal structure of the histidine binding protein complexed with histidine has been determined at 2.5-Angstrom resolution by the molecular replacement method using as a probe structure the previously solved lysine liganded structure of the lysine-, arginine-, ornithine binding protein (LAG), which shares 70% sequence identity with HisJ. The structure is bi-lobate; the two lobes, one bigger than the other, are connected by two short strands and are in contact with each other (closed) enclosing the histidine. Charged, polar, and non-polar side chains, as well as the peptide backbone, are involved in tight binding of the histidine. The bound histidine is involved in eight direct hydrogen bonds, six with the bigger lobe and two with the smaller lobe, in one potential water-mediated hydrogen bond with the bigger lobe, as well as in ionic interactions. The HisJ residues surrounding the ligand are the same as the LAO residues interacting with lysine, except for residue 52 which is leucine in HisJ and phenylalanine in LAG. The Leu-52 in HisJ makes a hydrophobic interaction with the imidazole ring of histidine. Of seven mutations affecting the ligand-binding site, five are located in the ligand-binding site, one in a con strand, and one at the domains interface. Based on comparisons among related binding proteins, the specific interactions between the ligands and the respective binding protein residues are predicted for the glutamine-binding protein and the opines-binding protein C1 LAWRENCE BERKELEY LAB, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV STRUCT BIOL, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MOLEC & CELL BIOL, BERKELEY, CA 94720 USA. RI Oh, Byung-Ha/C-2061-2011 FU NIAID NIH HHS [AI30725]; NIDDK NIH HHS [DK43747] NR 59 TC 83 Z9 84 U1 0 U2 4 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 EI 1083-351X J9 J BIOL CHEM JI J. Biol. Chem. PD FEB 11 PY 1994 VL 269 IS 6 BP 4135 EP 4143 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MW989 UT WOS:A1994MW98900039 PM 8307974 ER PT J AU XUE, QF YEUNG, ES AF XUE, QF YEUNG, ES TI INDIRECT FLUORESCENCE DETERMINATION OF LACTATE AND PYRUVATE IN SINGLE ERYTHROCYTES BY CAPILLARY ELECTROPHORESIS SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 17th International Symposium on Column Liquid Chromatography (HPLC 93) CY MAY 09-14, 1993 CL HAMBURG, GERMANY SP GESELL DEUT CHEMIKER ID TUBULAR LIQUID-CHROMATOGRAPHY; ZONE ELECTROPHORESIS; QUANTITATIVE-DETERMINATION; ELECTROCHEMICAL DETECTION; INDIVIDUAL NEURONS; NATIVE PROTEINS; CELLS; SEPARATIONS AB A scheme of using fluorescein as the fluorophore for indirect detection of anions was demonstrated. This system is quite stable at a fluorescein concentration of 100 mu M even without any other buffer components. Different injection modes affect the limit of detection (LOD). A LOD of about 20 amol was obtained for lactate under optimal conditions. Lactate and pyruvate in the intracellular fluid of erythrocytes were measured in this manner. The average amounts in a single erythrocyte for lactate and pyruvate are 1.3 and 2.1 fmol, respectively, or a ratio of 1.6 for pyruvate to lactate. Variations of the absolute amounts and the ratios are fairly large among a group of 27 cells examined. This is consistent with the difference of cells in size and composition. Although the migration times changed by up to 20% during a series of runs from the influence of concomitants in the cells, the migration time ratio was maintained around 1.072 with 3% relative standard deviation. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 31 TC 74 Z9 83 U1 1 U2 11 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 FEB 11 PY 1994 VL 661 IS 1-2 BP 287 EP 295 DI 10.1016/0021-9673(94)85196-4 PG 9 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA MW729 UT WOS:A1994MW72900036 PM 8136909 ER PT J AU CLENDENIN, J AF CLENDENIN, J TI POLARIZED ELECTRON-BEAMS FOR LINEAR COLLIDERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SPIN POLARIZATION AB Longitudinally polarized electron beams for high energy collisions provide a sensitive way to explore the electroweak process as well as an effective means to measure spin dependent properties of particles. Once created, such beams are readily accelerated by linacs without loss of polarization, although emittance damping rings present potential hazards. The essential elements of a collider necessary for the utilization of polarized electrons are described. The key element is the polarized electron source as illustrated by the SLC which now operates with P(e) approximately 80% in the 50 GeV linac. Possible improvements for future colliders are discussed. RP CLENDENIN, J (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,POB 4349,STANFORD,CA 94309, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 11 PY 1994 VL 340 IS 1 BP 1 EP 10 DI 10.1016/0168-9002(94)91275-0 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW373 UT WOS:A1994MW37300002 ER PT J AU SAMPAYAN, SE CAPORASO, GJ HOLMES, CL LAUER, EJ PROSNITZ, D TRIMBLE, DO WESTENSKOW, GA AF SAMPAYAN, SE CAPORASO, GJ HOLMES, CL LAUER, EJ PROSNITZ, D TRIMBLE, DO WESTENSKOW, GA TI EMISSION FROM FERROELECTRIC CATHODES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have recently initiated an investigation of electron emission from ferroelectric cathodes. Our experimental apparatus consisted of an electron diode and a 250 kV, 12 OMEGA, 70 ns pulsed high voltage power source. A planar triode modulator driven by a synthesized waveform generator initiates the polarization inversion and allows inversion pulse tailoring. The pulsed high voltage power source is capable of delivering two high voltage pulses within 50 mus of each other and is capable of operating at a sustained repetition rate of 5 Hz. Our initial measurements indicate that emission cur-rent densities above the Child-Langmuir space charge limit, J(CL), are possible. We explain this effect to be based on a non-zero initial energy of the emitted electrons. We also determined that this effect is strongly coupled to relative timing between the inversion pulse and application of the main anode-cathode pulse. We also have initiated brightness measurements of the emitted beam and estimate a preliminary lower bound to be on the order of 10(9) A/m2 rad2. As in our previous measurements at this Laboratory, we performed the measurement using a pepper pot technique. Beamlet profiles are recorded with a fast phosphor and gated cameras. We describe our apparatus and preliminary measurements. RP SAMPAYAN, SE (reprint author), LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 11 TC 39 Z9 42 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 FEB 11 PY 1994 VL 340 IS 1 BP 90 EP 95 DI 10.1016/0168-9002(94)91283-1 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW373 UT WOS:A1994MW37300010 ER PT J AU SCHULTZ, D ALLEY, R AOYAGI, H CLENDENIN, J FRISCH, J GARDEN, C HOYT, E KIRBY, R KLAISNER, L KULIKOV, A MULHOLLAN, G PRESCOTT, C SAEZ, P TANG, H TURNER, J WOODS, M YEREMIAN, D ZOLOTOREV, M AF SCHULTZ, D ALLEY, R AOYAGI, H CLENDENIN, J FRISCH, J GARDEN, C HOYT, E KIRBY, R KLAISNER, L KULIKOV, A MULHOLLAN, G PRESCOTT, C SAEZ, P TANG, H TURNER, J WOODS, M YEREMIAN, D ZOLOTOREV, M TI THE HIGH PEAK CURRENT POLARIZED ELECTRON SOURCE OF THE STANFORD-LINEAR-COLLIDER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The Stanford Linear Collider injector requires two 2 ns pulses of 4.5-5.5 X 10(10) electrons, separated by 61 ns at 120 Hz, from its source. Since 1992, these currents have been provided by a polarized electron source based on GaAs photocathodes. A beam polarization of 76 +/- 4% has been measured-at the end of the 50 GeV linac. At low photocathode quantum efficiencies, and for excitation near threshold, the maximum current delivered by the source is constrained, not by the space charge limit of the gun, but by a ''charge limit'' of the photocathode. The charge limited current is proportional to the pholocathode quantum efficiency, but the proportionality varies for different photocathode types. Experience with high polarization strained GaAs photocathodes on a test beamline and on the SLC is presented. C1 NAGOYA UNIV,FAC SCI,NAGOYA 46401,JAPAN. RP SCHULTZ, D (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 11 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 11 PY 1994 VL 340 IS 1 BP 127 EP 132 DI 10.1016/0168-9002(94)91290-4 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW373 UT WOS:A1994MW37300017 ER PT J AU CLENDENIN, J AOYAGI, H FRISCH, J MATSUMOTO, H NAKANISHI, T SCHULTZ, D TANG, H YEREMIAN, D YOSHIOKA, M AF CLENDENIN, J AOYAGI, H FRISCH, J MATSUMOTO, H NAKANISHI, T SCHULTZ, D TANG, H YEREMIAN, D YOSHIOKA, M TI PROSPECTS FOR GENERATING POLARIZED ELECTRON-BEAMS FOR A LINEAR COLLIDER USING AN RF GUN SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SPIN POLARIZATION; PHOTOEMISSION; LAYER AB The next generation of linear colliders - represented by the Japanese Linear Collider (JLC) and the Next Linear Collider (NLC) - will probably utilize polarized electrons generated by a photocathode gun. A photocathode gun with high polarization (P(e)) photocathodes (up to P(e) approximately 80% achieved ro date) is currently providing polarized electrons for the SLC. The SLC source requires subharmonic bunching at low energy to reduce the bunch length prior to S-band bunching and a damping ring at high energy to reduce the transverse emittance. The use of an rf gun can eliminate the former and possibly simplify the latter. However, rf guns as presently developed have serious problems with vacuum contamination, which would quickly lower the quantum efficiency (QE) of a semiconductor photocathode. In addition, the ''charge limit'' previously reported for high peak current pulses puts a limit on the laser power usable for photoexciting a low QE cathode near the bandgap threshold. These problems have so far precluded any serious attempt to design an rf gun for polarized electrons. Several technical advances that now improve the prospects for a practical polarized electron rf gun are described. Finally, new ideas for high polarization photocathodes that permit operation in a relatively poor vacuum and techniques being explored to mitigate the low QE ''charge limit'' are discussed. C1 NAGOYA UNIV,DEPT PHYS,NAGOYA,AICHI 464,JAPAN. NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 305,JAPAN. RP CLENDENIN, J (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 33 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 FEB 11 PY 1994 VL 340 IS 1 BP 133 EP 138 DI 10.1016/0168-9002(94)91291-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW373 UT WOS:A1994MW37300018 ER PT J AU SRINIVASANRAO, T FISCHER, J TSANG, T AF SRINIVASANRAO, T FISCHER, J TSANG, T TI ROLE OF OPTICAL-FIELD IN PHOTOEMISSION FROM COPPER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LASER-PULSES; ELECTRON; GOLD AB Photoemission from a diamond turned copper mirror with laser beams of intensity 10(11) W/cm2 at the photon energy of 2 eV and pulse duration of approximately 300 fs indicates that the electric field associated with the photons enhances the photoemission. At the optimum incident angle, the electron yield with p-polarized light was 75 times larger than that with s-polarized light and four times larger than that at normal incidence for a constant energy. These enhancements were underestimated by the changes in the absorption and were attributed in this paper to the optical field effect. RP SRINIVASANRAO, T (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 9 TC 4 Z9 4 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 FEB 11 PY 1994 VL 340 IS 1 BP 186 EP 189 DI 10.1016/0168-9002(94)91298-X PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW373 UT WOS:A1994MW37300025 ER PT J AU FISCHER, J SRINIVASANRAO, T TSANG, T BRANDES, G AF FISCHER, J SRINIVASANRAO, T TSANG, T BRANDES, G TI PHOTOEMISSION FROM MAGNESIUM AND FROM DIAMOND FILM USING HIGH-INTENSITY LASER-BEAMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Dependence of photoelectron emissions on the angle of incidence, polarization and laser intensity from a Mg mirror and from a boron doped multicrystalline diamond film was explored with laser beams of intensities up to several 10(11) W/cm2, 2 eV photon energy and 300 fs pulse duration. For both cathodes, the electron charge density varied as the third power of the laser intensity. At a constant laser intensity and p-polarization, the charge density was larger at 70-75-degrees than at normal incidence, by a factor of 70 for Mg and 3 for the diamond film. Similarly, the yield ratio between p- and s-polarization at this angle was about 90 for Mg and 2 for the diamond film. In Mg, the enhancements can be attributed to the corresponding changes in absorption. The low ratios for diamond were attributed in part to the uneven multicrystalline surface. In a brief test with a low intensity 5 eV, 20 ns beam from a KrF excimer laser on the diamond film, charge density increased linearly with intensity; and the efficiency was over 6 X 10(-6). The maximum measured charge densities (limited by space charge and possibly by other effects) at the cathodes, for both the Mg and the diamond film using the high intensity 2 eV beams, were over 20 nC/cm 2, indicating possible current densities of over 60 KA/cm2. Optical field effects were not observed. C1 ADV TECHNOL MAT INC,DANBURY,CT 06810. RP FISCHER, J (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 10 TC 3 Z9 3 U1 0 U2 4 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 FEB 11 PY 1994 VL 340 IS 1 BP 190 EP 194 DI 10.1016/0168-9002(94)91299-8 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW373 UT WOS:A1994MW37300026 ER PT J AU SUNDSTROM, G MOWAT, JR DANARED, H DATZ, S BROSTROM, L FILEVICH, A KALLBERG, A MANNERVIK, S RENSFELT, KG SIGRAY, P AFUGGLAS, M LARSSON, M AF SUNDSTROM, G MOWAT, JR DANARED, H DATZ, S BROSTROM, L FILEVICH, A KALLBERG, A MANNERVIK, S RENSFELT, KG SIGRAY, P AFUGGLAS, M LARSSON, M TI DESTRUCTION RATE OF H-3+ BY LOW-ENERGY ELECTRONS MEASURED IN A STORAGE-RING EXPERIMENT SO SCIENCE LA English DT Article ID RECOMBINATION RATE COEFFICIENT; DISSOCIATIVE-RECOMBINATION; H5+ IONS; MU-M; JUPITER; HCO+; H3+; AURORAE; BEAM AB Knowledge of the abundance of H-3+ is needed in interstellar and planetary atmospheric chemistry. An important destruction mechanism of H-3+ is low-energy electron impact followed by dissociation, but estimates of the reaction rate span several orders of magnitude. As an attempt to resolve this uncertainty, the cross section for dissociative recombination of vibrationally cold H-3+ has been measured with an ion storage ring down to collision energies below 1 millielectron volt. A rate coefficient of 1.15 x 10(-7) cubic centimeters per second at 300 kelvin was deduced. The cross section scaled with collision energy according to E-1.15, giving the rate a temperature dependence of T-0.65. C1 ROYAL INST TECHNOL, DEPT PHYS 1, S-10044 STOCKHOLM 70, SWEDEN. N CAROLINA STATE UNIV, DEPT PHYS, RALEIGH, NC 27695 USA. UNIV STOCKHOLM, MANNE SIEGBAHN LAB, S-10405 STOCKHOLM, SWEDEN. OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. COMIS NACL ENERGIA ATOM, DEPT PHYS, RA-1429 BUENOS AIRES, DF, ARGENTINA. NR 36 TC 128 Z9 128 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD FEB 11 PY 1994 VL 263 IS 5148 BP 785 EP 787 DI 10.1126/science.263.5148.785 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MV866 UT WOS:A1994MV86600027 PM 17770831 ER PT J AU BONCA, J BALATSKY, AV AF BONCA, J BALATSKY, AV TI COMPOSITE-OPERATORS FOR A BCS SUPERCONDUCTOR SO JETP LETTERS LA English DT Article ID MODEL AB A new form of the composite operator which generalizes the Cooper pairs for a BCS superconductor is introduced. This approach is similar to the derivation of the composite operator of the odd-frequency superconductors. Examples of the d(x2-y2), d(xy), and p-wave composite operators for a 2D t-J model are given. C1 UNIV LJUBLJANA,J STEFAN INST,61111 LJUBLJANA,SLOVENIA. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LD LANDAU THEORET PHYS INST,MOSCOW,RUSSIA. RP BONCA, J (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,DIV THEORET,T-11,LOS ALAMOS,NM 87545, USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-3640 J9 JETP LETT+ JI Jetp Lett. PD FEB 10 PY 1994 VL 59 IS 3 BP 216 EP 218 PG 3 WC Physics, Multidisciplinary SC Physics GA NC978 UT WOS:A1994NC97800014 ER PT J AU MCCALL, KR AF MCCALL, KR TI THEORETICAL-STUDY OF NONLINEAR ELASTIC-WAVE PROPAGATION SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article AB A theoretical study of the propagation of a plane wave in a material with nonlinear response is presented. We start with the wave equation for an isotropic, homogeneous, elastic solid with cubic anharmonicity in the moduli, accounting for attenuation by introducing complex linear and nonlinear moduli. A heirarchy of equations, ordered in powers of the displacement field, is developed. Using a Green function technique, we solve this set of equations systematically for the displacement field at distance x from the source. We examine the influence of propagation distance, source frequency spectrum, source displacement amplitude, attenuation, and nonlinear coefficient on the spectrum of a propagating wave. The displacement field for various source functions is calculated using parameters typical of rocks. RP MCCALL, KR (reprint author), LOS ALAMOS NATL LAB, DIV EARTH & ENVIRONM SCI, MAIL STOP D443, LOS ALAMOS, NM 87545 USA. NR 12 TC 47 Z9 50 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD FEB 10 PY 1994 VL 99 IS B2 BP 2591 EP 2600 DI 10.1029/93JB02974 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MW736 UT WOS:A1994MW73600003 ER PT J AU GOLDSTEIN, P CHOUET, B AF GOLDSTEIN, P CHOUET, B TI ARRAY MEASUREMENTS AND MODELING OF SOURCES OF SHALLOW VOLCANIC TREMOR AT KILAUEA VOLCANO, HAWAII SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID WAVE-NUMBER METHODS; IZU-OSHIMA VOLCANO; RUPTURE PROPAGATION; SEISMIC SOURCE; DENSE ARRAY; EARTHQUAKES; FIELDS; REPRESENTATION; EXPLOSIONS; MECHANISM AB We show that resonances in near-surface layers (path effects), or a combination of near-surface resonances and source resonances (source effects), could be responsible for the sharp spectral peaks found in the records of gas-piston activity and volcanic tremor recorded near Puu Oo crater on Kilauea Volcano, Hawaii. Two types of sources are found to be compatible with observations and can not be distinguished using our data. In one model, impulsive, explosion point sources are embedded in the Puu Oo structure. In the other model, impulsive, point sources of pressure excite the resonances of a fluid-filled crack embedded in that structure. Both models require shallow sources (z < 100 m) and display a strong dependence of the radiated spectrum on source depth over a depth range comparable to the overall thickness of the surficial layers. Based on these results, it may be possible to track changes in source depth through temporal changes in observed spectra, a potentially useful tool for monitoring volcanic activity at this site. We estimate the depth and spatial extent of volcanic tremor and gas-piston activity using two dense arrays with respective apertures of 800 and 120 m located near Puu Oo. Measurements of slowness (ray parameter) and azimuth as a function of time clearly indicate that the sources of volcanic tremor and gas-piston activity are located beneath or in close proximity to the Puu Oo crater at depths shallower than approximately 1 km. Based on slowness and particle motion analyses we find that the records of volcanic tremor and gas-piston events at Puu Oo consist of a complex combination of body and surface waves. C1 US GEOL SURVEY, MENLO PK, CA 94025 USA. RP GOLDSTEIN, P (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV EARTH SCI, L-205, POB 808, LIVERMORE, CA 94550 USA. NR 43 TC 78 Z9 78 U1 1 U2 3 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 FEB 10 PY 1994 VL 99 IS B2 BP 2637 EP 2652 DI 10.1029/93JB02639 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MW736 UT WOS:A1994MW73600006 ER PT J AU FERNANDEZ, J RUNDLE, JB AF FERNANDEZ, J RUNDLE, JB TI GRAVITY CHANGES AND DEFORMATION DUE TO A MAGMATIC INTRUSION IN A 2-LAYERED CRUSTAL MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID HALF-SPACE AB We develop and extend theoretical and computational methods for the calculation of the deformation, gravity and potential change due to a point source of magma injection into a multilayered, elastic-gravitational earth model. In our calculations, which are based upon the method outlined by Rundle, two distinct layers overlying a half-space may be incorporated. The source can be located in either of the layers or the half-space. The method is quite general, and can be readily adapted to calculations in which stresses in either the layers or the half-space relax by viscoelastic flow. The results obtained indicate that the use of homogeneous half-space to represent the Earth may in some cases be too simple a model and that variations in elastic moduli have a more significant effect than variation in reference density on both the surface displacements and gravity changes. As an example, we calculate the displacement and gravity changes due to a subsurface mass injection in a crust-mantle model appropriate to the volcanic island of Lanzarote, which is presently the subject of numerous geophysical experiments. Both historical and recent data indicate that Lanzarote may be subject to some risk of volcanic eruption in the future, thus our calculations may be useful in interpreting observations of preeruption phenomena, The results are discussed in terms of prediction versus measurement capabilities. C1 LAWRENCE LIVERMORE NATL LAB, DEPT EARTH SCI, LIVERMORE, CA 94550 USA. RP FERNANDEZ, J (reprint author), CIUDAD UNIV MADRID, FAC CIENCIAS MATEMAT, INST ASTRON & GEODESIA, E-28040 MADRID, SPAIN. RI Fernandez, Jose/K-1669-2014 OI Fernandez, Jose/0000-0001-5745-3527 NR 19 TC 48 Z9 48 U1 0 U2 0 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 FEB 10 PY 1994 VL 99 IS B2 BP 2737 EP 2746 DI 10.1029/93JB02449 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MW736 UT WOS:A1994MW73600012 ER PT J AU SAULT, AG PEDEN, CHF BOESPFLUG, EP AF SAULT, AG PEDEN, CHF BOESPFLUG, EP TI METAL-SUPPORT INTERACTIONS IN HYDROUS TITANIUM OXIDE-SUPPORTED NICKEL-CATALYSTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID INFRARED-SPECTROSCOPY; CARBON-MONOXIDE; CO; TEMPERATURE; ADSORPTION; NI; SURFACES AB A combination of techniques, including AES, SIMS, FTIR, and hydrogen chemisorption, has been used to investigate the activation of nickel ions supported on hydrous titanium oxide (HTO) ion-exchange materials. HTO supports allow metal ions to be loaded via ion exchange such that atomic dispersion is attained in the as-prepared material, even for high metal loadings. The results presented here support earlier work indicating that nickel forms large, 10-20-nm particles during hydrogen reduction of Ni/HTO at temperatures of 300 degrees C or greater. During reduction, these particles become covered by an amorphous film which inhibits catalytic activity. Evidence is presented which supports the theory that this film is composed of carbonaceous residue which originates from the organometallic precursors and organic solvents used to synthesize the HTO support. Reduction/oxidation cycles result in oscillations in the nickel surface concentration which are attributed to decoration of the particles by partially reduced TiOx species, in a manner similar to a strong metal-support interaction (SMSI). This SMSI occurs at temperatures as low as 300 degrees C, well below the temperatures typically required to induce SMSI on crystalline titania supports. This low onset temperature appears to be related to the amorphous nature of the HTO support, which may be more easily reduced than crystalline titania. Mild oxidation (300 degrees C) of Ni/HTO prior to reduction increases the amount of metal surface area which is formed during reduction by altering the interaction of the nickel ions with the support such that smaller nickel particles are formed. More severe oxidation treatments (>400 degrees C) lead to a decrease in active surface area by increasing the interaction of nickel ions with the support such that a smaller fraction of the nickel ions can be reduced and participate in particle formation. RP SANDIA NATL LABS, DEPT GLASS & ELECTR CERAM PROPERTIES 1845, DEPT FUEL SCI 6211, ALBUQUERQUE, NM 87185 USA. OI Peden, Charles/0000-0001-6754-9928 NR 39 TC 25 Z9 26 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 10 PY 1994 VL 98 IS 6 BP 1652 EP 1662 DI 10.1021/j100057a019 PG 11 WC Chemistry, Physical SC Chemistry GA MW678 UT WOS:A1994MW67800019 ER PT J AU ALVARENGA, AD SABOUNGI, ML CURTISS, LA GRIMSDITCH, M MCNEIL, LE AF ALVARENGA, AD SABOUNGI, ML CURTISS, LA GRIMSDITCH, M MCNEIL, LE TI STRUCTURE AND DYNAMICS OF MOLTEN ALUMINUM AND GALLIUM TRIHALIDES .2. RAMAN-SPECTROSCOPY AND AB-INITIO CALCULATIONS SO MOLECULAR PHYSICS LA English DT Article ID BASIS SET AB Results of Raman scattering experiments combined with ab initio molecular orbital calculations are presented on the structure and vibrational properties of molten GaI3, GaBr3, AlCl3, and AlBr3. It is confirmed that, to a high degree, all of these compounds have in the molten state a dimer structure, represented by M(2)X(6), consisting of two tetrahedra sharing a halide edge. It is shown that in AlCl3 the melting process leads to a drastic change in the vibrational spectrum, whereas in the remaining salts the crystalline peak positions are essentially preserved. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. UNIV N CAROLINA, DEPT PHYS & ASTRON, CHAPEL HILL, NC 27599 USA. RI Saboungi, Marie-Louise/C-5920-2013; Alvarenga, Ana Paula/M-9790-2014 OI Saboungi, Marie-Louise/0000-0002-0607-4815; NR 31 TC 23 Z9 23 U1 3 U2 8 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD FEB 10 PY 1994 VL 81 IS 2 BP 409 EP 420 DI 10.1080/00268979400100271 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MY174 UT WOS:A1994MY17400011 ER PT J AU DELEON, JM LI, GG CONRADSON, SD BISHOP, AR SUBRAMANIAN, MA RAISTRICK, ID AF DELEON, JM LI, GG CONRADSON, SD BISHOP, AR SUBRAMANIAN, MA RAISTRICK, ID TI PLANAR OXYGEN-CENTERED LATTICE INSTABILITIES IN TL-BASED HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID ABSORPTION FINE-STRUCTURE; AXIAL-OXYGEN; YBA2CU3O7; TRANSITION; TC; TL2BA2CACU2O8; LA2-XSRXCUO4 AB Analysis of the copper K-edge X-ray absorption fine structure on Tl2Ba2CuO6, Tl2Ba2CaCu2O8, and Tl2Ba1.2Sr0.8CuO6 indicates that the copper-equatorial oxygen local structure changes in the vicinity of the superconducting transition. These data also show that the radial distribution function for these bonds is complex with several oxygen positions relative to the copper, indicating that the local structure of the CuO2 planes differs significantly from the average crystal structure. These results suggest the presence of polarons in these planes, whose structure changes across the superconducting transition, and are thus coupled to the hole pairing states. C1 DUPONT CO INC,DEPT CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880. RP DELEON, JM (reprint author), LOS ALAMOS NATL LAB,ELECTR RES & CONDENSED MATTER THEORY GRP,LOS ALAMOS,NM 87545, USA. RI Mustre de Leon, Jose/B-5630-2009 OI Mustre de Leon, Jose/0000-0002-0513-2323 NR 31 TC 13 Z9 13 U1 1 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 FEB 10 PY 1994 VL 220 IS 3-4 BP 377 EP 382 DI 10.1016/0921-4534(94)90927-X PG 6 WC Physics, Applied SC Physics GA MW564 UT WOS:A1994MW56400022 ER PT J AU KUNG, PJ WAHLBECK, PG MCHENRY, ME MALEY, MP PETERSON, DE AF KUNG, PJ WAHLBECK, PG MCHENRY, ME MALEY, MP PETERSON, DE TI GRANULARITY, MICROSTRUCTURE, AND FLUX-CREEP IN TLBA2CA2CU3O9+DELTA SUPERCONDUCTING POWDER AND SILVER-SHEATHED TAPES SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID CA-CU-O; HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; MAGNETIC-FIELD; MODEL; DEPENDENCE; ANISOTROPY; VORTICES; CRYSTALS; SYSTEM AB Silver-sheathed TlBa2Ca2Cu3O9+delta (TI-1223) tapes, with a transport critical current density, J(ct), of 6200 A/cm2 at 75 K under zero magnetic field, were fabricated by the oxide-powder-in-tube (OPIT) method and characterized using an X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and superconducting quantum interference device (SQUID) magnetometer. The results of the magnetization and SEM study indicate that, in these tapes, individual grains are distributed randomly in orientation and weak links exist. However, strongly linked percolative current paths within the tape persisting in increasing fields, accompanied by strong intrinsic interplanar coupling, sustain a significant J(ct) at high fields and lead to the plateau in the J(ct)-H curve. Dislocation networks, which may act as effective pinning centers, are the common features observed in the tapes. To investigate the effects on flux pinning due to thermomechanical processing, magnetic relaxation at 1 and 2 T over 5-50 K was measured. The tape shows slightly lower normalized relaxation rates (S = - (1/M0) dM/dln t) than the cauliflower-like precursor powder. Analyses of the relaxation data obtained from the tape, after incorporating temperature dependence and field scaling, yield an expression for the effective pinning energy, U(eff)(J, T, H) = (U1/H-0.54) [1 - (T/72.5)2]4 (J/J(i))mu. This result was compared with the prediction of the collective flux-creep model, which suggests that Tl-1223 has a three-dimension-like (3D-like) vortex lattice. Presumably, a more plate-like powder morphology may result in improved texturing by the OPIT process. Tl0.5Bi0.5Sr2CaCu2O7+delta ((Tl, Bi)-1212) powder with this morphology was therefore synthesized for comparison. C1 WICHITA STATE UNIV, DEPT CHEM, WICHITA, KS 67260 USA. CARNEGIE MELLON UNIV, DEPT MAT SCI & ENGN, PITTSBURGH, PA 15213 USA. RP LOS ALAMOS NATL LAB, CTR SUPERCOND TECHNOL, LOS ALAMOS, NM 87544 USA. RI McHenry, Michael/B-8936-2009 NR 38 TC 27 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD FEB 10 PY 1994 VL 220 IS 3-4 BP 310 EP 322 DI 10.1016/0921-4534(94)90917-2 PG 13 WC Physics, Applied SC Physics GA MW564 UT WOS:A1994MW56400012 ER PT J AU EGIDO, JL ROBLEDO, LM CHASMAN, RR AF EGIDO, JL ROBLEDO, LM CHASMAN, RR TI HIGH-SPIN SHAPES IN OS-182 WITH DENSITY-DEPENDENT FORCES SO PHYSICS LETTERS B LA English DT Article ID DEFORMED-NUCLEI; SUPERDEFORMATION; ISOMERISM; ENERGIES; STATES; LESS AB The first shape-constrained high-spin Hartree-Fock-Bogoliubov calculations, using the density dependent Gogny interaction, have been carried out to investigate the energy minima in Os-182. Deep, well separated minima have been found for shapes with axis ratios of 1.5:1 and 2.2:1. Corrections for rotational zero point energies and for particle number fluctuations are taken into account. Comparisons are made with cranked Strutinsky calculations for this nucleus. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP EGIDO, JL (reprint author), UNIV AUTONOMA MADRID,DEPT FIS TEOR C-XI,E-28049 MADRID,SPAIN. RI Robledo, Luis Miguel/L-2557-2013; Egido, J. Luis/F-4921-2017 OI Robledo, Luis Miguel/0000-0002-6061-1319; Egido, J. Luis/0000-0002-8292-6127 NR 23 TC 15 Z9 15 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 FEB 10 PY 1994 VL 322 IS 1-2 BP 22 EP 26 DI 10.1016/0370-2693(94)90485-5 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MV949 UT WOS:A1994MV94900005 ER PT J AU GARCIA, S GURALNIK, GS LAWSON, J AF GARCIA, S GURALNIK, GS LAWSON, J TI A NEW APPROACH TO NUMERICAL QUANTUM-FIELD THEORY SO PHYSICS LETTERS B LA English DT Article AB In this note we present a new numerical method for solving Lattice Quantum Field Theory. This Source Galerkin Method is fundamentally different in concept and application from Monte Carlo based methods which have been the primary mode of numerical solution in Quantum Field Theory. Source Galerkin is not probabilistic and treats fermions and bosons in an equivalent manner, C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GARCIA, S (reprint author), BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD FEB 10 PY 1994 VL 322 IS 1-2 BP 119 EP 124 DI 10.1016/0370-2693(94)90499-5 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MV949 UT WOS:A1994MV94900019 ER PT J AU CHANOWITZ, MS KILGORE, W AF CHANOWITZ, MS KILGORE, W TI COMPLEMENTARITY OF RESONANT AND NONRESONANT STRONG WW SCATTERING AT THE LHC SO PHYSICS LETTERS B LA English DT Article ID STRONG W+W+ SCATTERING; EQUIVALENCE THEOREM; STRONG HIGGS; SIGNALS; BOSON; SSC; SYMMETRY; SECTOR; MASS AB We exhibit a complementary relationship between resonant WZ and nonresonant W+ W+ scattering in a chiral Lagrangian model of the electroweak symmetry breaking sector with a dominant ''rho'' meson. We use the model to estimate the minimum luminosity for the LHC to ensure a ''no-lose'' capability to observe the symmetry breaking sector. RP CHANOWITZ, MS (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 45 TC 27 Z9 27 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 FEB 10 PY 1994 VL 322 IS 1-2 BP 147 EP 153 DI 10.1016/0370-2693(94)90503-7 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MV949 UT WOS:A1994MV94900023 ER PT J AU SHUH, DK LO, CW YARMOFF, JA SANTONI, A TERMINELLO, LJ MCFEELY, FR AF SHUH, DK LO, CW YARMOFF, JA SANTONI, A TERMINELLO, LJ MCFEELY, FR TI CHLORINE CHEMISORPTION ON AND THE ONSET OF ETCHING OF CLEAVED GAAS(110) AT ROOM-TEMPERATURE SO SURFACE SCIENCE LA English DT Article ID SUPERSONIC MOLECULAR-BEAM; SURFACES; ENERGY; GAAS; CL2; ADSORPTION; SHIFTS AB Cleaved GaAs(110) surfaces are exposed to Cl2 at room temperature and then examined by surface-sensitive soft X-ray photoelectron spectroscopy of the valence, As 3d, and Ga 3d levels. The results show that AsCl, AsCl2, and GaCl all form on the surface after small exposures, while GaCl2 forms after larger exposures. A detailed analysis of the data shows that, after the initial Cl2, exposures, Ga and As atoms are anisotropically etched from the surface, with Ga being removed first. As a consequence of the etching process, a number of Ga and As atoms are stabilized in sub-surface three-fold sites. After larger exposures, the surface is considerably roughened. C1 UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. NR 34 TC 32 Z9 32 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 FEB 10 PY 1994 VL 303 IS 1-2 BP 89 EP 100 DI 10.1016/0039-6028(94)90622-X PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MW784 UT WOS:A1994MW78400013 ER PT J AU SAALFRANK, P MILLER, WH AF SAALFRANK, P MILLER, WH TI QUANTUM-MECHANICAL RATES FOR GAS-SURFACE PROCESSES SO SURFACE SCIENCE LA English DT Article ID DISCRETE VARIABLE REPRESENTATION; ABSORBING BOUNDARY-CONDITIONS; MULTIPLE-BAND THEORY; DISSOCIATIVE ADSORPTION; METAL-SURFACES; NICKEL SURFACES; SELF-DIFFUSION; H-2 DISSOCIATION; ASSOCIATIVE DESORPTION; HYDROGEN MIGRATION AB We determine exact quantum-mechanical rates for reactive scattering of hydrogen and its isotopes at and from metal surfaces. To this end, we compute cumulative reaction probabilities according to Miller, Schwartz and Tromp [J. Chem. Phys. 79 (1983) 48891, in the discrete variable representation with absorbing boundary conditions formulation of Seideman and Miller [J. Chem. Phys. 96 (1992) 4412]. In particular, canonical rates for dissociative adsorption and associative desorption of H-2 and isotopomers, as well as rates and diffusion coefficients for the diffusive motion of single hydrogen atoms on transition-metal surfaces are considered. For the adsorption/ desorption processes we use various two- and three-dimensional model potential energy surfaces, which are thought to be typical for the interaction of H-2 with first-row transition metals. First for uncorrugated and rigid surfaces, the dependence of the rates on temperature(s) and potential parameters are studied. Second, we allow for non-rigidity of the substrate using the so-called surface-mass and surface-oscillator models of Luntz and Harris [Surf. Sci. 258 (1991) 3971. Further, we find that the inclusion of surface corrugation increases desorption rates, characterized by larger Arrhenius-preexponential frequencies. In our study of rates and diffusion coefficients for the hopping motion of atoms on metal substrates we focus on hydrogen on Ni(100). One- and two-dimensional realistic potential energy surfaces are used to elucidate the role of quantum effects, isotope effects, and dimensionality. We compare our results to simple quasi-classical and classical forms of transition-state theory and to experiment. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. OI Saalfrank, Peter/0000-0002-5988-5945 NR 101 TC 11 Z9 11 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 FEB 10 PY 1994 VL 303 IS 1-2 BP 206 EP 230 DI 10.1016/0039-6028(94)90634-3 PG 25 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MW784 UT WOS:A1994MW78400025 ER PT J AU COX, DM CAMERON, SD TUINMAN, A GAKH, A ADCOCK, JL COMPTON, RN HAGAMAN, EW KNIAZ, K FISCHER, JE STRONGIN, RM CICHY, MA SMITH, AB AF COX, DM CAMERON, SD TUINMAN, A GAKH, A ADCOCK, JL COMPTON, RN HAGAMAN, EW KNIAZ, K FISCHER, JE STRONGIN, RM CICHY, MA SMITH, AB TI X-RAY PHOTOELECTRON AND NMR-STUDIES OF POLYFLUORINATED C-60 - EVIDENCE THAT C-C BONDS ARE BROKEN SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID FULLERENES AB In order to better understand the properties and composition of solids pf polyfluorinated C-60, X-ray photoelectron spectroscopy (XPS) was used to characterize several different C60Fx samples synthesized in two different laboratories. Quantitative measurements of the F-1s, C-1s and O-1s, XPS signals established the elemental stoichiometry of each sample. The F/C ratios for the different samples ranged from 28/60 to 53/60 in general agreement with previous mass spectroscopy studies of each sample. C-1s energies and shifts as well as solid-state nuclear magnetic resonance studies provided additional information about the degree of fluorination and level bf C-C bond breaking. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. UNIV PENN,DEPT MAT SCI,PHILADELPHIA,PA 19104. UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104. RP COX, DM (reprint author), EXXON RES & ENGN CO,ANNANDALE,NJ 08801, USA. RI Strongin, Robert/F-1026-2010 NR 22 TC 41 Z9 41 U1 0 U2 1 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 FEB 9 PY 1994 VL 116 IS 3 BP 1115 EP 1120 DI 10.1021/ja00082a039 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA MW990 UT WOS:A1994MW99000039 ER PT J AU GOURLEY, PL WENDT, JR VAWTER, GA BRENNAN, TM HAMMONS, BE AF GOURLEY, PL WENDT, JR VAWTER, GA BRENNAN, TM HAMMONS, BE TI OPTICAL-PROPERTIES OF 2-DIMENSIONAL PHOTONIC LATTICES FABRICATED AS HONEYCOMB NANOSTRUCTURES IN COMPOUND SEMICONDUCTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID EXISTENCE; GAP AB We have experimentally studied two-dimensional photonic lattices, honeycomb nanostructures, fabricated by electron beam lithography with (Al,Ga)As materials. Surface normal optical properties were investigated by measuring reflectance to determine the effective index of refraction and lattice stability against degradation. Also, continuous wave and time-resolved luminescence spectroscopy was used to assess electron-hole recombination. Finally, light scattering was employed to study photon coupling and propagation through the lattice. These measurements show that the structures are stable, that nonradiative surface recombination is present, and that resonant coupling of light into/out of the lattice occurs at selected wavelengths satisfying a Bragg condition. RP GOURLEY, PL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 77 Z9 77 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 FEB 7 PY 1994 VL 64 IS 6 BP 687 EP 689 DI 10.1063/1.111034 PG 3 WC Physics, Applied SC Physics GA MV501 UT WOS:A1994MV50100006 ER PT J AU WEI, SH ZUNGER, A AF WEI, SH ZUNGER, A TI STRAIN EFFECTS ON THE SPECTRA OF SPONTANEOUSLY ORDERED GAXIN1-XP SO APPLIED PHYSICS LETTERS LA English DT Article ID BAND-GAP; ALLOYS; SEMICONDUCTORS AB Spontaneous (111) CuPt-like ordering has been widely observed in GaxIn1-xP lattice matched (x=x(0)) to a GaAs(001) substrate. This leads to a band-gap reduction Delta E(g) and to a valence-band splitting Delta E(12). We explore here the consequence of the coexistence of (001) epitaxial strain (produced by selecting x not equal x(0)) and (111) chemical ordering. This leads to distinct changes in Delta E(g) and Delta E(12) which could serve as new fingerprints of ordering. RP WEI, SH (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 14 TC 24 Z9 26 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 FEB 7 PY 1994 VL 64 IS 6 BP 757 EP 759 DI 10.1063/1.111057 PG 3 WC Physics, Applied SC Physics GA MV501 UT WOS:A1994MV50100030 ER PT J AU LIEPINS, R JAHN, RK ELLIOTT, NE HUBBARD, KM AF LIEPINS, R JAHN, RK ELLIOTT, NE HUBBARD, KM TI MAGNETIC-FIELD PROCESSING OF POLYMERS .1. HYDROXYPROPYL CELLULOSE SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID MAIN-CHAIN; FLEXIBLE SPACERS; LIQUID-CRYSTALS; POLYESTERS; ORIENTATION; PHASE AB Hydroxypropyl cellulose (HPC) of degree of substitution three and average molecular weight of 100,000 was processed in a magnetic field of 1.2 T. Films of HPC were cast from water, methanol, ethyl methyl ketone, and 1,1,2,2-tetrachloroethane solutions in a magnetic field using static and dynamic casting techniques. The processed films were evaluated for tensile strength, elastic modulus, microhardness, and molecular chain alignment by wide angle x-ray diffraction and polarized infrared. The best alignment and hence the greatest improvement in properties was obtained using a combined magnetic field and flow alignment procedure. These samples showed no increase in the elastic modulus, a 106% increase in the tensile strength, a 21% increase in the microhardness, and were dichroic. (C) 1994 John Wiley & Sons, Inc.(double dagger) RP LIEPINS, R (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,MAIL STOP E549,LOS ALAMOS,NM 87545, USA. NR 39 TC 5 Z9 6 U1 1 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD FEB 7 PY 1994 VL 51 IS 6 BP 1141 EP 1149 DI 10.1002/app.1994.070510620 PG 9 WC Polymer Science SC Polymer Science GA MR268 UT WOS:A1994MR26800020 ER PT J AU ALEXANDER, FJ LEBOWITZ, JL AF ALEXANDER, FJ LEBOWITZ, JL TI ON THE DRIFT AND DIFFUSION OF A ROD IN A LATTICE FLUID SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID REVERSIBLE MARKOV-PROCESSES; PARTICULATE MATTER; SEGREGATION AB We study the dynamics of a 'rod', a large particle which occupies several lattice sites, as it moves in a fluid of monomers each of which occupies only one site. Both the rod and the monomers move by hopping to unoccupied neighbouring sites, interacting with each other through a hard-core exclusion which prevents two particles from occupying the same site. Reversible hopping rates give rise to a diffusive process for the rod which, when rescaled, converges to standard Brownian motion. We use computer simulations to determine the diffusion coefficient as a function of rod size and monomer density. Non-reversible rates bias hops in one particular direction and give rise to a driven diffusive behaviour which shows a surprising relationship between the rod's velocity and its size [1]. Here we present a detailed description of this phenomenon including the case where the rod is held stationary, forming a fixed obstacle. We show that some of the features of this driven system can be accounted for by a discretized, Burgers-like equation whose linearized continuum analogue describes the flow of ground water past an obstacle, but more work remains to be done on the continuum limit of this model. C1 RUTGERS STATE UNIV,DEPT MATH,NEW BRUNSWICK,NJ 08903. RUTGERS STATE UNIV,DEPT PHYS,NEW BRUNSWICK,NJ 08903. RP ALEXANDER, FJ (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 15 TC 17 Z9 17 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD FEB 7 PY 1994 VL 27 IS 3 BP 683 EP 696 DI 10.1088/0305-4470/27/3/014 PG 14 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA MX136 UT WOS:A1994MX13600014 ER PT J AU TIKOFSKY, AM LIBBY, SB LAUGHLIN, RB AF TIKOFSKY, AM LIBBY, SB LAUGHLIN, RB TI GAUGE-THEORY OF THE 3-DIMENSIONAL CHIRAL SPIN LIQUID SO NUCLEAR PHYSICS B LA English DT Article ID STATE; SUPERCONDUCTIVITY; FERMIONS; MODEL AB We have perturbatively evaluated the dynamics of the gauge field seen in finite-size studies of quasiparticle interactions in the 3-d chiral spin liquid [2]. The calculated dynamics agree with the near-field behavior of the gauge field seen in the previous numerical work. However, the far-field behavior of a quasiparticle's magnetic field configuration is found to be dipolar, rather than monopolar as previously claimed. We also identify a new non-rotationally invariant 3-d term in the gauge field's effective lagrangian and ascribe the observed behavior to this term. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP TIKOFSKY, AM (reprint author), STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305, USA. NR 20 TC 5 Z9 5 U1 1 U2 2 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 FEB 7 PY 1994 VL 413 IS 3 BP 579 EP 604 DI 10.1016/0550-3213(94)90002-7 PG 26 WC Physics, Particles & Fields SC Physics GA MZ284 UT WOS:A1994MZ28400002 ER PT J AU DUBBS, T ALBUQUERQUE, IF BONDAR, NF CARRIGAN, R CHEN, D COOPER, PS DAI, LS DENISOV, AS DOBROVOLSKY, AV 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 TANG, FK TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA YAN, J ZHAO, WH ZHENG, SC ZHONG, YY AF DUBBS, T ALBUQUERQUE, IF BONDAR, NF CARRIGAN, R CHEN, D COOPER, PS DAI, LS DENISOV, AS DOBROVOLSKY, AV 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 TANG, FK TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA YAN, J ZHAO, WH ZHENG, SC ZHONG, YY TI MEASUREMENT OF THE BRANCHING RATIO FOR THE XI(-)-]SIGMA(-)GAMMA-RADIATIVE DECAY SO PHYSICAL REVIEW LETTERS LA English DT Article ID WEAK RADIATIVE DECAYS; DOMINANCE AB We have measured the branching ratio for the hyperon radiative decay XI- --> SIGMA- gamma from a sample of 211 +/- 33 events obtained in the polarized 375 GeV/c charged hyperon beam at Fermilab. We find B(XI- --> SIGMA- gamma/XI- --> LAMBDA0pi-) = (1.22 +/- 0.23 +/- 0.06) X 10(-4) where the quoted errors are statistical and systematic, respectively. We have also obtained an indication that the sign of the asymmetry parameter of this decay is positive. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. PETERSBURG NUCL PHYS INST,GATCHINA,RUSSIA. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. UNIV IOWA,IOWA CITY,IA 52242. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA. SUNY ALBANY,ALBANY,NY 12222. UNIV FED PARAIBA,PARAIBA,BRAZIL. CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. CONSELHO NACL DESENVOLVIMENTO CIENT & TECHNOL,CONSELHO NACL PESQUISAS,RIO JANEIRO,BRAZIL. UNIV SAO PAULO,SAO PAULO,BRAZIL. YALE UNIV,JW GIBBS LAB,NEW HAVEN,CT 06520. 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 9 TC 14 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 7 PY 1994 VL 72 IS 6 BP 808 EP 811 DI 10.1103/PhysRevLett.72.808 PG 4 WC Physics, Multidisciplinary SC Physics GA MV430 UT WOS:A1994MV43000004 ER PT J AU ALVES, GA AMATO, S ANJOS, JC APPEL, JA ASTORGA, J BERNARD, T BRACKER, SB CREMALDI, LM DARLING, CL DIXON, RL ERREDE, D GAY, C GREEN, DR JEDICKE, R KARCHIN, PE KWAN, S LUEKING, LH NETO, JRTD METHENY, J MILBURN, RH DEMIRANDA, JM DAMOTTA, H NAPIER, A PASSMORE, D RAFATIAN, A DOSREIS, AC ROSS, WR SANTORO, AFS SHEAFF, M SOUZA, MHG SPALDING, WJ STOUGHTON, C STREETMAN, ME SUMMERS, DJ TAKACH, SF WALLACE, A WU, Z AF ALVES, GA AMATO, S ANJOS, JC APPEL, JA ASTORGA, J BERNARD, T BRACKER, SB CREMALDI, LM DARLING, CL DIXON, RL ERREDE, D GAY, C GREEN, DR JEDICKE, R KARCHIN, PE KWAN, S LUEKING, LH NETO, JRTD METHENY, J MILBURN, RH DEMIRANDA, JM DAMOTTA, H NAPIER, A PASSMORE, D RAFATIAN, A DOSREIS, AC ROSS, WR SANTORO, AFS SHEAFF, M SOUZA, MHG SPALDING, WJ STOUGHTON, C STREETMAN, ME SUMMERS, DJ TAKACH, SF WALLACE, A WU, Z TI ENHANCED LEADING PRODUCTION OF D(PLUS-OR-MINUS) AND D-ASTERISK(PLUS-OR-MINUS) IN 250-GEV PI(PLUS-OR-MINUS) NUCLEON-INTERACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRONIC COLLISIONS; CHARM PRODUCTION; DEPENDENCE AB A leading charm meson is one with longitudinal momentum fraction, x(F) > 0, whose light quark (or antiquark) is of the same type as one of the quarks in the beam particle. We report on the production asymmetry, A = [sigma(leading) - sigma(nonleading)]/[sigma(leading) + sigma(nonleading)] as a function of x(F). The data consist of 1500 fully reconstructed D+/- and D*+/- decays in Fermilab experiment E769. We find a significant asymmetry at large x(F), consistent with the recent result of CERN experiment WA82. Such an asymmetry for the production of charm quarks is not expected in perturbative quantum chromodynamics. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MISSISSIPPI,OXFORD,MS 38677. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ALVES, GA (reprint author), CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. RI Anjos, Joao/C-8335-2013; Alves, Gilvan/C-4007-2013; de Mello Neto, Joao/C-5822-2013 OI de Mello Neto, Joao/0000-0002-3234-6634 NR 11 TC 88 Z9 88 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 FEB 7 PY 1994 VL 72 IS 6 BP 812 EP 815 DI 10.1103/PhysRevLett.72.812 PG 4 WC Physics, Multidisciplinary SC Physics GA MV430 UT WOS:A1994MV43000005 ER PT J AU HUGHES, JR AHMAD, I BECKER, JA BRINKMAN, MJ CARPENTER, MP CEDERWALL, B DELEPLANQUE, MA DIAMOND, RM DRAPER, JE DUYAR, C FALLON, P HARFENIST, S HENRY, EA HENRY, RG HOFF, RW JANSSENS, RVF KHOO, TL LAURITSEN, T LEE, IY RUBEL, E STEPHENS, FS STOYER, MA AF HUGHES, JR AHMAD, I BECKER, JA BRINKMAN, MJ CARPENTER, MP CEDERWALL, B DELEPLANQUE, MA DIAMOND, RM DRAPER, JE DUYAR, C FALLON, P HARFENIST, S HENRY, EA HENRY, RG HOFF, RW JANSSENS, RVF KHOO, TL LAURITSEN, T LEE, IY RUBEL, E STEPHENS, FS STOYER, MA TI LIFETIME MEASUREMENT IN EXCITED AND YRAST SUPERDEFORMED BANDS IN HG-194 SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEI AB Nuclear level lifetimes have been measured in two superdeformed bands in Hg-194 using the Doppler-shift attenuation method. Average transition quadrupole moments derived from the life-times of an excited and yrast superdeformed bands are Q(t) = 17.6(30) and 17.2(20) eb, respectively. The Doppler shifts of the excited band relative to the yrast band indicate a slight difference in quadrupole moments [+4(5)%], assuming similar side feeding. These results imply that the second well is stable and rigid with respect to the particle excitation responsible for this excited band. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP HUGHES, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Cederwall, Bo/M-3337-2014; Carpenter, Michael/E-4287-2015 OI Cederwall, Bo/0000-0003-1771-2656; Carpenter, Michael/0000-0002-3237-5734 NR 24 TC 23 Z9 23 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 7 PY 1994 VL 72 IS 6 BP 824 EP 827 DI 10.1103/PhysRevLett.72.824 PG 4 WC Physics, Multidisciplinary SC Physics GA MV430 UT WOS:A1994MV43000008 ER PT J AU MINEEVWEINSTEIN, MB MAINIERI, R AF MINEEVWEINSTEIN, MB MAINIERI, R TI OBSERVATION OF CONSERVATION-LAWS IN-DIFFUSION LIMITED AGGREGATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLOWS AB We repeat the numerical experiments for diffusion limited aggregation (DLA) and show that there is a potentially infinite set of conserved quantities for the long time asymptotics. We connect these observations with the exact integrability of the continuum limit of the DLA (quasistatic Stefan problem). The conserved quantities of the Stefan problem (harmonic moments) when discretized are our conserved quantities. These numerical experiments show that the exact integrability of the Stefan problem may be continued beyond the formation of cusps in the moving boundary. RP MINEEVWEINSTEIN, MB (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MSB258,LOS ALAMOS,NM 87545, USA. NR 18 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 7 PY 1994 VL 72 IS 6 BP 880 EP 883 DI 10.1103/PhysRevLett.72.880 PG 4 WC Physics, Multidisciplinary SC Physics GA MV430 UT WOS:A1994MV43000022 ER PT J AU FYE, RM AF FYE, RM TI ANOMALOUS FIXED-POINT BEHAVIOR OF 2 KONDO IMPURITIES - A REEXAMINATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID LOW-TEMPERATURE PROPERTIES; MONTE-CARLO; ANDERSON MODEL; MAGNETIC-IMPURITIES; EXCITATION-SPECTRA; 2-IMPURITY AB We consider the existence of ''anomalous fixed point behavior'' for the Kondo two-impurity Hamiltonian. This ''anomalous'' behavior is predicted by calculations which use the ''energy-independent coupling constants'' (ECC) approximation. Using well-controlled quantum Monte Carlo methods without the ECC approximation, we find no evidence for ''anomalous'' behavior. We then show that the ECC approximation is, in general, either inconsistent or uninteresting. These results together strongly suggest that the predicted ''anomalous'' behavior of two Kondo impurities is simply the result of an unphysical approximation rather than an intrinsic property of the model itself. RP FYE, RM (reprint author), SANDIA NATL LABS,MS 1111,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 29 TC 40 Z9 40 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 FEB 7 PY 1994 VL 72 IS 6 BP 916 EP 919 DI 10.1103/PhysRevLett.72.916 PG 4 WC Physics, Multidisciplinary SC Physics GA MV430 UT WOS:A1994MV43000031 ER PT J AU WANG, RW MILLS, DL FULLERTON, EE MATTSON, JE BADER, SD AF WANG, RW MILLS, DL FULLERTON, EE MATTSON, JE BADER, SD TI SURFACE SPIN-FLOP TRANSITION IN FE/CR(211) SUPERLATTICES - EXPERIMENT AND THEORY SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTILAYERS AB We report experimental and theoretical studies of the magnetization curves of Fe/Cr(211) superlattices with antiferromagnetic interlayer coupling and uniaxial in-plane anisotropy. There are substantial differences between structures with an even and an odd number of Fe layers, when the magnetic field is applied along the easy axis. For even layered superlattices, the inequivalence of the terminal Fe layers gives rise to a surface spin-flop transition that evolves into a bulk spin-flop arrangement with increasing magnetic field, as originally envisioned by Keffer and Chow [Phys. Rev. Lett. 31, 1061 (1973)]. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP WANG, RW (reprint author), UNIV CALIF IRVINE,INST SURFACE & INTERFACE SCI,IRVINE,CA 92717, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 13 TC 138 Z9 140 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 7 PY 1994 VL 72 IS 6 BP 920 EP 923 DI 10.1103/PhysRevLett.72.920 PG 4 WC Physics, Multidisciplinary SC Physics GA MV430 UT WOS:A1994MV43000032 ER PT J AU XANTHEAS, SS RUEDENBERG, K AF XANTHEAS, SS RUEDENBERG, K TI POTENTIAL-ENERGY SURFACES OF CARBON-DIOXIDE SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID GROUND-STATE; SIMULTANEOUS-OPTIMIZATION; AB-INITIO; CO2; ATOMS AB Several bent valence states of CO2 are characterized by means of full-valence-space MCSCF calculations. The ground state potential energy surface exhibits a double well corresponding to a ring minimum, with C(2v)symmetry ((1)A(1)) and a 73.1 degrees OCO angle, in addition to the linear ((1) Sigma(g)(+)) global minimum. The transition state for the ring opening process, which has a barrier of 12.1 kcal/mole with respect to the ring minimum, is however found to have C-s symmetry. Double minima are also shown to exist for the (1)A(2), B-1(1) and B-1(2) excited states. However, in these cases all minima are bent. Cross sections through the ground state potential energy surface corresponding to the two collinear exchange reactions O(D-1) + CO((1) Sigma(+)) --> OC((1) Sigma(+)) + O(D-1) C(P-3) + O-2((3) Sigma(g)(-)) --> CO((1) Sigma(+)) + O(D-1) are also calculated and their energy contour maps are reported. The latter reveals the existence of a stable linear intermediate with the structure COO. (C) 1994 John Wiley and Sons, Inc. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 38 TC 19 Z9 19 U1 0 U2 6 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD FEB 5 PY 1994 VL 49 IS 4 BP 409 EP 427 DI 10.1002/qua.560490408 PG 19 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA MU696 UT WOS:A1994MU69600007 ER PT J AU CHEN, L GAVINI, N TSURUTA, H ELIEZER, D BURGESS, BK DONIACH, S HODGSON, KO AF CHEN, L GAVINI, N TSURUTA, H ELIEZER, D BURGESS, BK DONIACH, S HODGSON, KO TI MGATP-INDUCED CONFORMATIONAL-CHANGES IN THE IRON PROTEIN FROM AZOTOBACTER-VINELANDII, AS STUDIED BY SMALL-ANGLE X-RAY-SCATTERING SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID ELECTRON-PARAMAGNETIC-RESONANCE; MAGNESIUM ADENOSINE 5'-TRIPHOSPHATE; CLOSTRIDIUM-PASTEURIANUM; NITROGENASE; AZOFERREDOXIN AB Small angle x-ray scattering experiments have been carried out on the purified iron proteins of nitrogenase from wild-type Azotobacter vinelandii and from a Nif- mutant strain, A. vinelandii UW91 (which has an A157S mutation). This study was designed to investigate the influence of MgATP and MgADP binding on the protein structure in solution. For the wild-type protein, the binding of MgATP induces a significant conformational change that is observed as a decrease of about 2.0 angstrom in the radius of gyration. In contrast, the binding of MgADP to the wild-type iron protein does not detectably affect the radius of gyration. In the absence of nucleotides, the radius of gyration for the UW91 mutant is indistinguishable from that of the wild-type. However, unlike for the wild-type protein, the radius of gyration of the UW91 iron protein is unaffected by the addition of MgATP. We have previously shown that the UW91 iron protein has a normal [4Fe-4S] cluster and MgATP binding ability but that it is completely blocked for electron transfer and MgATP hydrolysis (Gavini, N., and Burgess, B. K. (1992) J. Biol. Chem. 267, 21179-21186), These x-ray scattering measurements suggest that a conformation different from that of the native state is therefore required for the iron protein to perform electron transfer to the MoFe protein. These results also support the hypothesis that Ala-157 is crucial for the iron protein to establish the electron-transfer-favored conformation induced by MgATP binding. C1 STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. UNIV CALIF IRVINE,DEPT MOLEC BIOL & BIOCHEM,IRVINE,CA 92717. FU NCRR NIH HHS [RR01209, RR-01209]; NIGMS NIH HHS [GM-43144] NR 26 TC 38 Z9 38 U1 0 U2 0 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 FEB 4 PY 1994 VL 269 IS 5 BP 3290 EP 3294 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MV631 UT WOS:A1994MV63100028 PM 8106367 ER PT J AU LLOYD, S AF LLOYD, S TI ENVISIONING A QUANTUM SUPERCOMPUTER SO SCIENCE LA English DT Article RP LLOYD, S (reprint author), LOS ALAMOS NATL LAB,T-13 COMPLEX SYST,MS-B213,LOS ALAMOS,NM 87545, USA. NR 6 TC 60 Z9 60 U1 0 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 4 PY 1994 VL 263 IS 5147 BP 695 EP 695 DI 10.1126/science.263.5147.695 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MU964 UT WOS:A1994MU96400054 PM 17747663 ER PT J AU PERSHINA, V FRICKE, B IONOVA, GV JOHNSON, E AF PERSHINA, V FRICKE, B IONOVA, GV JOHNSON, E TI THERMODYNAMIC FUNCTIONS OF ELEMENT 105 IN NEUTRAL AND IONIZED STATES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRONIC-STRUCTURE; GROUP-5 ELEMENTS; P-ELEMENT; CHEMISTRY; PHYSICS; ATOMS; CHROMATOGRAPHY; KURCHATOVIUM; LAWRENCIUM; ENERGIES AB The basic thermodynamic functions, the entropy, free energy, and enthalpy, for element 105 (hahnium) in electronic configurations d(3)s(2), d(3)sp, and d(4)s(1) and for its +5 ionized state (5f(14)) have been calculated as a function of temperature. The data are based on the results of the calculations of the corresponding electronic states of element 105 using the multiconfiguration Dirac-Fock method. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RUSSIAN ACAD SCI,INST PHYS CHEM,11795 MOSCOW,RUSSIA. RP PERSHINA, V (reprint author), UNIV KASSEL,DEPT THEORET PHYS,W-3500 KASSEL,GERMANY. NR 20 TC 6 Z9 7 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 3 PY 1994 VL 98 IS 5 BP 1482 EP 1486 DI 10.1021/j100056a019 PG 5 WC Chemistry, Physical SC Chemistry GA MV288 UT WOS:A1994MV28800019 ER PT J AU XU, MD NEMATOLLAHI, M SEXTRO, RG GADGIL, AJ NAZAROFF, WW AF XU, MD NEMATOLLAHI, M SEXTRO, RG GADGIL, AJ NAZAROFF, WW TI DEPOSITION OF TOBACCO-SMOKE PARTICLES IN A LOW VENTILATION ROOM SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID INDOOR AIR; CHEMICAL-COMPOSITION; AEROSOL DYNAMICS; STIRRED TANK; ENVIRONMENTS; CHAMBERS; MUSEUMS; RATES; GAS AB Deposition on indoor surfaces is an important removal mechanism for tobacco smoke particles. We report measurements of deposition rates of environmental tobacco smoke particles in a room-size chamber. The deposition rates were determined from the changes in measured concentrations by correcting for the effects of coagulation and ventilation. The air-flow turbulent intensity parameter was determined independently by measuring the air velocities in the chamber. Particles with diameters < 0.25 mum coagulate to form larger particles of sizes between 0.25 and 0.5 mum. The effect of coagulation on the particles > 0.5 mum was found to be negligible. Comparison between our measurements and calculations using the theory of Crump and Seinfeld (1981) showed smaller measured deposition rates for particles from 0.1 to 0.3 mum in diameter and greater measured deposition rates for particles larger than 0.6 mum at three mixing intensities. Comparison of Nazaroff and Cass' model (1989a) for natural convection flow showed good agreement with the measurements for particles > 0.1 mum in diameter, however, measured deposition rates exceeded model predictions by a factor of approximately 4 for particles in size range of 0.05-0.1 mum in diameter. These results were used to predict deposition of sidestream smoke particles on interior surfaces. Calculations predict that in 10 hours after smoking one cigarette, 22% of total sidestream particles by mass will deposit on interior surfaces at 0.03 air change per hour (ACH), 6% will deposit at 0.5 ACH, and 3% will deposit at 1 ACH. C1 UNIV CALIF BERKELEY,DEPT CIVIL ENGN,BERKELEY,CA 94720. RP XU, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,INDOOR ENVIRONM PROGRAM,BLDG 90-3058,1 CYCLOTRON RD,LIVERMORE,CA 94550, USA. RI Nazaroff, William/C-4106-2008; OI Nazaroff, William/0000-0001-5645-3357; Gadgil, Ashok/0000-0002-0357-9455 NR 31 TC 57 Z9 60 U1 2 U2 7 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD FEB PY 1994 VL 20 IS 2 BP 194 EP 206 DI 10.1080/02786829408959676 PG 13 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NF882 UT WOS:A1994NF88200006 ER PT J AU FARRINGTON, RB CLAUNCH, SD AF FARRINGTON, RB CLAUNCH, SD TI INFRARED IMAGING OF LARGE-AMPLITUDE, LOW-FREQUENCY DISTURBANCES ON A PLANAR JET SO AIAA JOURNAL LA English DT Article AB The purpose of this study is to demonstrate that periodic, large-amplitude, low-frequency disturbances on a planar jet can increase spreading and mixing of a planar jet with the surrounding fluid. This is achieved by enhancing the natural instabilities of the jet, resulting in the formation of large vortical structures in the mixing layers. The jet had a Reynolds number of about 7.2 X 10(3), an aspect ratio of 47, and Strouhal numbers, based on the nozzle width and the disturbance frequency, up to 0.324. A relatively new technique, full-field infrared imaging, was used to determine jet behavior and mixing. This technique provides a significant advantage over conventional temperature measurement techniques. Over 68,000 data points can be monitored as often as 30 times each second. Contour plots of the isotherms of the infrared images showed that the disturbances increased the spread rate of the jet and accelerated the transition of the planar jet into an axisymmetric regime. A relative mixing efficiency was defined and measured. The mixing that occurred within the thermal half-width of the jet when pulsed at Str = 0.168 was about 32% greater at seven nozzle widths than that of the natural jet. RP FARRINGTON, RB (reprint author), NATL RENEWABLE ENERGY LAB,DIV BLDG & ENERGY SYST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 13 TC 22 Z9 22 U1 1 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD FEB PY 1994 VL 32 IS 2 BP 317 EP 323 DI 10.2514/3.11987 PG 7 WC Engineering, Aerospace SC Engineering GA MV016 UT WOS:A1994MV01600012 ER PT J AU TEGROTENHUIS, WE RADKE, CJ DENN, MM AF TEGROTENHUIS, WE RADKE, CJ DENN, MM TI BROWNIAN DYNAMICS OF STERICALLY-STABILIZED COLLOIDAL SUSPENSIONS SO AICHE JOURNAL LA English DT Article ID FLUCTUATION DISSIPATION THEOREM; SELF-DIFFUSION COEFFICIENT; CONCENTRATION-DEPENDENCE; REPULSIVE FORCES; POLYMER BRUSHES; SPHERE FLUID; PARTICLES; LIQUIDS AB Using Brownian dynamics, equilibrium and dynamic properties are calculated for colloidal suspensions that are stabilized through the Milner, Witten and Cates (1988) steric potential. Results are reported for osmotic pressures, radial distribution functions, static structure factors, and self-diffusion coefficients. The sterically-stabilized systems are also approximated by equivalent hard spheres, with good agreement for osmotic pressure and long-range structure. The suitability of the potential to model the behavior of a real system is explored by comparing static structure factors calculated from Brownian dynamics simulations to those measured using SANS (Markovic et al., 1986). Finally, the effects of Hamaker and hydrodynamic forces on calculated properties are investigated. C1 LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. NR 52 TC 4 Z9 4 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0001-1541 EI 1547-5905 J9 AICHE J JI AICHE J. PD FEB PY 1994 VL 40 IS 2 BP 283 EP 293 DI 10.1002/aic.690400208 PG 11 WC Engineering, Chemical SC Engineering GA MV744 UT WOS:A1994MV74400007 ER PT J AU HACKER, BC AF HACKER, BC TI WHEN THE NATION WAS IN NEED - BLACKS IN THE WOMENS ARMY CORPS DURING WORLD-WAR-II - PUTNEY,MS 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 FEB PY 1994 VL 99 IS 1 BP 324 EP 325 DI 10.2307/2166352 PG 2 WC History SC History GA MX692 UT WOS:A1994MX69200206 ER PT J AU ETTINGER, HJ AF ETTINGER, HJ TI VOLUNTEERS - SHORT OF TIME, HIGH IN IMPORTANCE SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Editorial Material RP ETTINGER, HJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM, USA. NR 0 TC 0 Z9 0 U1 0 U2 3 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 FEB PY 1994 VL 55 IS 2 BP 101 EP 101 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA MV494 UT WOS:A1994MV49400001 ER PT J AU VOLKOW, ND WANG, GJ HITZEMANN, R FOWLER, JS OVERALL, JE BURR, G WOLF, AP AF VOLKOW, ND WANG, GJ HITZEMANN, R FOWLER, JS OVERALL, JE BURR, G WOLF, AP TI RECOVERY OF BRAIN GLUCOSE-METABOLISM IN DETOXIFIED ALCOHOLICS SO AMERICAN JOURNAL OF PSYCHIATRY LA English DT Article ID REVERSIBLE CEREBRAL ATROPHY; ABSTINENT ALCOHOLICS; TOMOGRAPHY; REPRODUCIBILITY; ETHANOL; MRI; PET AB Objective: To differentiate withdrawal-related abnormalities in brain glucose metabolism among alcoholics from abnormalities that may be irreversible or antedate alcohol use, the authors evaluated metabolic recovery during alcohol detoxification. Method: Regional brain glucose metabolism was measured with positron emission tomography and 2-deoxy-2-[F-18]fluoro-D-glucose in 10 male alcoholics at 8-15 days, 16-30 days, and 31-60 days after last use of alcohol. The alcoholics' metabolic values were compared with those of 10 age-matched male healthy volunteers. Results: Brain metabolism increased significantly during detoxification. There were significant differences in global and regional measures between the first and last time points but not between the second and third points, suggesting that recovery occurred predominantly within 16-30 days. Regional increases in metabolism were greater in the frontal regions. Whereas during the first evaluation the alcoholics showed significantly lower metabolism in various brain regions than the comparison group, at the end of detoxification the alcoholics showed significantly lower absolute and relative metabolic values in the basal ganglia and lower relative metabolic values in the parietal cortex. Among the alcoholics, but not the comparison group, metabolism in the frontal, parietal, and left temporal cortexes was negatively correlated with years of alcohol use and with age. Conclusions: This study shows significant increases in brain metabolism during alcohol withdrawal and documents persistent low metabolic levels in the basal ganglia of detoxified alcoholics. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. VET AFFAIRS HOSP,DEPT PSYCHIAT,NORTHPORT,NY. RP VOLKOW, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NINDS NIH HHS [NS-15638] NR 33 TC 125 Z9 127 U1 0 U2 1 PU AMER PSYCHIATRIC ASSOCIATION PI WASHINGTON PA 1400 K ST NW, WASHINGTON, DC 20005 SN 0002-953X J9 AM J PSYCHIAT JI Am. J. Psychiat. PD FEB PY 1994 VL 151 IS 2 BP 178 EP 183 PG 6 WC Psychiatry SC Psychiatry GA MV488 UT WOS:A1994MV48800004 PM 8296885 ER PT J AU DRUMMOND, MS ALLISON, DT WESOLOWSKI, DJ AF DRUMMOND, MS ALLISON, DT WESOLOWSKI, DJ TI IGNEOUS PETROGENESIS AND TECTONIC SETTING OF THE ELKAHATCHEE QUARTZ DIORITE, ALABAMA APPALACHIANS - IMPLICATIONS FOR PENOBSCOTIAN MAGMATISM IN THE EASTERN BLUE RIDGE SO AMERICAN JOURNAL OF SCIENCE LA English DT Review ID CAROLINA SLATE BELT; LACHLAN FOLD BELT; SOUTHERN APPALACHIANS; WESTERN IRELAND; VOLCANIC-ROCKS; NEWFOUNDLAND APPALACHIANS; SOUTHEASTERN AUSTRALIA; GEOCHEMICAL VARIATIONS; ROCKFORD GRANITE; TETAGOUCHE GROUP AB The Elkahatchee Quartz Diorite (EQD) is a pre-metamorphic (Penobscot age, 490-500 Ma) batholith and the largest intrusive complex (880 km(2)) exposed in the Blue Ridge province of the southern, Appalachians. Slightly peraluminous to metaluminous, calc-alkaline I-type tonalite-granodiorite is the principal lithology of the batholithic complex, with subordinate cumulate hornblende-biotite gabbro-diorite and biotite-epidote schistose enclaves, quartz-biotite metadacite porphyry, and felsic granitoids (granite, trondhjemite, and quartz monzonite). These lithologies display a slight normal zonation with accumulation of rare gabbro-diorite enclaves around the outer margin, followed by the dominant tonalite-granodiorite, and a concentration of felsic granitoids in the batholithic core. Schistose enclaves are scattered throughout the EQD as meter- to centimeter-size elliptical bodies. The enclaves are interpreted to represent disrupted fragments of cumulate material that formed as near-liquidus sidewall cyrstallization products. Active convection in the EQD magma chamber segmented the gabbro-diorite enclaves into discrete meter-size enclaves along the batholith's outer margin. Convective transportation of gabbro-diorite cumulate material into the interior of the evolving granitic magma chamber led to mechanical disaggregation, solid-melt reaction, and ultimately schistose enclave generation. Hornblende barometry and hornblende-plagioclase thermometry of the gabbro-diorite enclaves provide crystallization estimates of 1 to 4 kb at 710 degrees to 850 degrees C. Down-plunge structural projection of the map relationships reveals a laccolithic geometry for the EQD. Previously unreported metadacite porphyry occurrences interpreted as being a cogenetic volcanic carapace suggest that the EQD may have experienced emplacement into its own volcanic ejecta. A broad range of SiO2 (47-74 percent) is represented by the enclaves (< 60 percent SiO2) and granitoids (> 60 percent of SiO2) df the EQD. Based upon least squares mixing calculations, major and minor element covariation is best explained by crystal fractionation. A two-stage crystallization process is invoked to represent the changing proportions of crystalline phases with magma evolution. Modeling of REE, Sr, and O isotopes and other trace element parameters indicates that the parental EQD magma was derived from partial melting of a source consisting of altered MORB plus minor deep sea sediment. Mafic tonalite-granodiorite parental magmas would exist in equilibrium with a restite assemblage of 30 percent hornblend-30 percent garnet-40 percent clinopyroxene (that is, hornblende eclogite). The EQD was probably generated from a subducting slab during Penobscotian orogenesis, underwent dynamic sidewall crystallization upon ascent through mid- to upper-crustal levels, and experienced final emplacement in a subvolcanic regime. We suggest that the EQD represents continental margin magmatism associated with incipient subduction of an oceanic slab beneath Laurentia. This investigation has compiled numerous Penobscot age plutonic, tectonic (ophlolite emplacement), and metamorphic events distributed throughout the Appalachians, which are proximal to previously proposed Laurentian margins (for example, Blue-Green-Long axis and the eastern North American gravity high). We suggest that the Penobscot age orogenesis may have spanned the length of the Appalachians and is, in part, represented by continental margin magmatism, such as the EQD. C1 UNIV SO ALABAMA,DEPT GEOL & GEOG,MOBILE,AL 36688. OAK RIDGE NATL LAB,DIV CHEM,GEOCHEM GRP,OAK RIDGE,TN 37831. RP DRUMMOND, MS (reprint author), UNIV ALABAMA,DEPT GEOL,BIRMINGHAM,AL 35294, USA. NR 173 TC 15 Z9 15 U1 0 U2 5 PU KLINE GEOLOGY LABORATORY PI NEW HAVEN PA YALE UNIV, NEW HAVEN, CT 06520 SN 0002-9599 J9 AM J SCI JI Am. J. Sci. PD FEB PY 1994 VL 294 IS 2 BP 173 EP 236 PG 64 WC Geosciences, Multidisciplinary SC Geology GA MW288 UT WOS:A1994MW28800002 ER PT J AU GOERINGER, DE ASANO, KG MCLUCKEY, SA HOEKMAN, D STILLER, SW AF GOERINGER, DE ASANO, KG MCLUCKEY, SA HOEKMAN, D STILLER, SW TI FILTERED NOISE FIELD SIGNALS FOR MASS-SELECTIVE ACCUMULATION OF EXTERNALLY FORMED IONS IN A QUADRUPOLE ION-TRAP SO ANALYTICAL CHEMISTRY LA English DT Article ID LASER DESORPTION; SPECTROMETRY; IONIZATION; EXCITATION; EJECTION; RANGE AB A new wideband resonance excitation technique, termed a filtered noise field (FNF), is demonstrated for selective accumulation of externally formed ions in the rf quadrupole ion trap. Data obtained for detection of trinitrotoluene (TNT) and black powder vapors in ambient air, via atmospheric sampling glow discharge ionization (ASGDI), indicate that a notch-filtered FNF signal applied to the endcap electrodes can prevent accumulation of matrix ions without adversely affecting the ion injection efficiency of analyte species. Consequently, analyte signal enhancement can be realized via extended ion accumulation times even though unwanted ions are present in overwhelming abundance. The TNT molecular anion signal obtained following a 1-s injection period is a factor of similar to 8 greater than that seen without the FNF; S-2(-) and S-3(-) cluster anion signals, obscured without the FNF due to matrix-ion-induced space charge effects, also are isolated completely via the FNF. The subsequently of concatenated FNF waveforms to enhance detection specificity via MS/MS is also illustrated. The FNF-ion trap techniques described here should be generally applicable to many other ionization sources, whether of internal or external configuration. C1 TELEDYNE ELECTR TECHNOL,MT VIEW,CA 94039. HITACHI INSTRUMENTS INC,SAN JOSE,CA 95134. RP GOERINGER, DE (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. RI McLuckey, Scott/B-2203-2009; Asano, Keiji/L-3164-2016 OI McLuckey, Scott/0000-0002-1648-5570; Asano, Keiji/0000-0003-2254-3586 NR 37 TC 71 Z9 72 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD FEB 1 PY 1994 VL 66 IS 3 BP 313 EP 318 DI 10.1021/ac00075a001 PG 6 WC Chemistry, Analytical SC Chemistry GA MU508 UT WOS:A1994MU50800001 ER PT J AU HEISE, TW YEUNG, ES AF HEISE, TW YEUNG, ES TI SPATIAL AND TEMPORAL IMAGING OF GAS-PHASE PROTEIN AND DNA PRODUCED BY MATRIX-ASSISTED LASER-DESORPTION SO ANALYTICAL CHEMISTRY LA English DT Article ID IONIZATION MASS-SPECTROMETRY; ORGANIC-MOLECULES; IONS; DISTRIBUTIONS; PEPTIDES AB The sensitivity of a transient imaging technique based on laser-excited fluorescence is shown to be within the levels required for studying matrix-assisted laser desorption (MALD) of large biomolecules. Results show that film morphology, particularly film thickness, has a major influence on plume dynamics. Fluorescent labeling of protein and of DNA is used to allow imaging in UV-MALD-generated plumes. Evidence that intact molecules are monitored is provided. Dye molecules, proteins, and DNAs were found to behave very differently in the vaporization process. The spatial and temporal distributions are important for the design of secondary ionization schemes to enhance ion yields, for the optimization of ion collection, and for maximizing resolution in time-of-flight mass spectrometers. 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 29 TC 21 Z9 21 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD FEB 1 PY 1994 VL 66 IS 3 BP 355 EP 361 DI 10.1021/ac00075a008 PG 7 WC Chemistry, Analytical SC Chemistry GA MU508 UT WOS:A1994MU50800008 PM 8135376 ER PT J AU GOODWIN, PH XUE, BG KUSKE, CR SEARS, MK AF GOODWIN, PH XUE, BG KUSKE, CR SEARS, MK TI AMPLIFICATION OF PLASMID DNA TO DETECT PLANT-PATHOGENIC MYCOPLASMALIKE ORGANISMS SO ANNALS OF APPLIED BIOLOGY LA English DT Article DE MYCOPLASMALIKE ORGANISMS; PLASMID; POLYMERASE CHAIN REACTION; PCR; PLANT DISEASE ID POLYMERASE CHAIN-REACTION; EXTRACHROMOSOMAL DNA; REACTION PCR; HYBRIDIZATION; IDENTIFICATION AB The polymerase chain reaction (PCR) was employed to develop a specific assay for plant pathogenic mycoplasmalike organisms (MLOs). A cloned fragment of a plasmid from a severe strain of western aster yellows (AY)-MLO was sequenced to identify oligonucleotide primers for PCR. Amplified DNA fragments of the predicted size were obtained from DNA extracted from plants and insects infected with pear decline MLO, beet leafhopper-transmitted virescence agent, elm yellows MLO-and several AY-MLO strains. No amplification occurred from healthy leafhopper or plant DNA. The PCR-based assay was over 500 times more sensitive than a hybridisation-based assay which utilised a cloned AY plasmid fragment as a probe. With the PCR-based assay, MLOs could be detected using DNA samples of leafhoppers that were only crushed and boiled in buffer. Amplification of the target DNA was confirmed by digestion of the PCR product with Mbo I which yielded predicted sized fragments for all MLO strains except Bradford AY and eastern AY. Sequencing the PCR product from elm yellows and eastern AY-MLOs revealed greater than 90% homology, and the failure to restrict the PCR product with Mbo I was due to a single base change in the restriction endonuclease site. The ability of the assay to detect a wide range of MLOs with minimal sample preparation and high sensitivity will be useful in epidemiological studies of MLO-caused diseases. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,GENOM GRP,LOS ALAMOS,NM 87545. RP GOODWIN, PH (reprint author), UNIV GUELPH,DEPT ENVIRONM BIOL,GUELPH N1G 2W1,ONTARIO,CANADA. NR 25 TC 25 Z9 25 U1 1 U2 2 PU ASSN APPLIED BIOLOGISTS PI WARWICK PA NATL VEGETABLE RES STATION WELLSBOURNE, WARWICK, ENGLAND CV35 9EF SN 0003-4746 J9 ANN APPL BIOL JI Ann. Appl. Biol. PD FEB PY 1994 VL 124 IS 1 BP 27 EP 36 DI 10.1111/j.1744-7348.1994.tb04112.x PG 10 WC Agriculture, Multidisciplinary SC Agriculture GA NC302 UT WOS:A1994NC30200004 ER PT J AU LEUNG, K STRAIN, SR DEBRUIJN, FJ BOTTOMLEY, PJ AF LEUNG, K STRAIN, SR DEBRUIJN, FJ BOTTOMLEY, PJ TI GENOTYPIC AND PHENOTYPIC COMPARISONS OF CHROMOSOMAL TYPES WITHIN AN INDIGENOUS SOIL POPULATION OF RHIZOBIUM-LEGUMINOSARUM BV TRIFOLII SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID BRADYRHIZOBIUM-JAPONICUM SEROCLUSTER-123; LINKED IMMUNOSORBENT-ASSAY; GENETIC DIVERSITY; ESCHERICHIA-COLI; NATURAL-POPULATIONS; ENZYME POLYMORPHISM; EASTERN WASHINGTON; ROOT-NODULES; STRAINS; NODULATION AB The relative genetic similarities of 200 isolates of Rhizobium leguminosarum bv. trifolii recovered from an Oregon soil were determined at 13 enzyme loci by multilocus enzyme electrophoresis (MLEE). These isolates represented 13 antigenically distinct serotypes recovered from nodules formed on various clover species. The MLEE-derived levels of relatedness among isolates of R. leguminosarum bv. trifolii were found to be in good agreement with the levels of relatedness established by using repetitive (repetitive extragenic palindromic and enterobacterial repetitive intergeneric consensus) sequences and the PCR technique and with levels of relatedness from previously published DNA reassociation studies. BIOLOG substrate utilization patterns showed that isolates within an electrophoretic type (ET) were phenotypically more similar to each other than to isolates of other ETs.The soil isolates were represented by 53 ETs which could be clustered into seven groups (groups B, E, G, H1, H2, I, and J). Evidence for multilocus structure within the population was obtained, and group B was identified as the primary creator of the disequilibrium. Of 75 isolates belonging to the nodule-dominant serotype AS6 complex, 72 were found in group B. Isolates WS2-01 and WS2-02 representing nodule-dominant serotypes recovered from subclover grown at another Oregon site were also found in group B. Isolates representing the most numerous ETs in group B (ETs 2 and 3) were either suboptimally effective or completely ineffective at fixing nitrogen on six different clover species. Another four groups of isolates (groups A, C, D, and F) were identified when 32 strains of diverse origins were analyzed by MLEE and incorporated into the cluster analysis. Group A was most dissimilar in comparisons with other groups and contained strain USDA 2124 (T24), which produces trifolitoxin and has unique symbiotic characteristics. C1 OREGON STATE UNIV,DEPT MICROBIOL,CORVALLIS,OR 97331. OREGON STATE UNIV,DEPT CROP & SOIL SCI,CORVALLIS,OR 97331. MICHIGAN STATE UNIV,DEPT MICROBIOL,MSU DOE PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,NSF CTR MICROBIAL ECOL,E LANSING,MI 48824. NR 67 TC 55 Z9 57 U1 0 U2 0 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 FEB PY 1994 VL 60 IS 2 BP 416 EP 426 PG 11 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA MU322 UT WOS:A1994MU32200006 PM 16349171 ER PT J AU MALACHOWSKY, KJ PHELPS, TJ TEBOLI, AB MINNIKIN, DE WHITE, DC AF MALACHOWSKY, KJ PHELPS, TJ TEBOLI, AB MINNIKIN, DE WHITE, DC TI AEROBIC MINERALIZATION OF TRICHLOROETHYLENE, VINYL-CHLORIDE, AND AROMATIC-COMPOUNDS BY RHODOCOCCUS SPECIES SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID CHLORINATED ALIPHATIC-HYDROCARBONS; METHYLOSINUS-TRICHOSPORIUM OB3B; POLYCHLORINATED-BIPHENYLS; OXIDIZING BACTERIUM; DEGRADATION; METABOLISM; BIODEGRADATION; CELL AB Two Rhodococcus strains which were isolated from a trichloroethylene (TCE)-degrading bacterial mixture and Rhodococcus rhodochrous ATCC 21197 mineralized vinyl chloride (VC) and TCE. Greater than 99.9% of a 1-mg/liter concentration of VC was degraded by cell suspensions. [1,2-C-14]VC was degraded by cell suspensions, with the production of greater than 66% (CO2)-C-14 and 20% C-14-aqueous phase products and incorporation of 10% of the C-14 into the biomass. Cultures that utilized propane as a substrate were able to mineralize greater than 28% of [1,2-C-14]TCE to (CO2)-C-14, with approximately 40% appearing in C-14-aqueous phase products and another 10% of C-14 incorporated into the biomass. VC degradation was oxygen dependent and occurred at a pH range of 5 to 10 and temperatures of 4 to 35 degrees C. Cell suspensions degraded up to 5 mg of TCE per liter and up to 40 mg of VC per liter. Propane competitively inhibited TCE degradation. Resting cell suspensions also degraded other chlorinated aliphatic hydrocarbons, such as chloroform, 1,1-dichloroethylene, and 1,1,1-trichloroethane. The isolates degraded a mixture of aromatic and chlorinated aliphatic solvents and utilized benzene, toluene, sodium benzoate, naphthalene, biphenyl, and n-alkanes ranging in size from propane to hexadecane as carbon and energy sources. The environmental isolates appeared more catabolically versatile than R. rhodochrous ATCC 21197. The data report that environmental isolates of Rhodococcus species and R. rhodochrous ATCC 21197 have the potential to degrade TCE and VC in addition to a variety of aromatic and chlorinated aliphatic compounds either individually or in mixtures. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. UNIV NEWCASTLE UPON TYNE,DEPT ORGAN CHEM,NEWCASTLE TYNE NE1 7RU,ENGLAND. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. RI phelps, tommy/A-5244-2011 NR 40 TC 82 Z9 84 U1 3 U2 7 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD FEB PY 1994 VL 60 IS 2 BP 542 EP 548 PG 7 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA MU322 UT WOS:A1994MU32200023 PM 16349184 ER PT J AU SANDISON, DR WEBB, WW AF SANDISON, DR WEBB, WW TI BACKGROUND REJECTION AND SIGNAL-TO-NOISE OPTIMIZATION IN CONFOCAL AND ALTERNATIVE FLUORESCENCE MICROSCOPES SO APPLIED OPTICS LA English DT Article DE CONFOCAL MICROSCOPE; SIGNAL; BACKGROUND; NOISE; NIPKOW DISK; LINE ILLUMINATION; SLIT DETECTION; FLUORESCENCE; RESOLUTION VOLUME ID APERTURE; SYSTEM; LIGHT AB In the confocal microscope, tightly focused illumination and spatially filtered detection are combined to reduce out-of-focus background and to produce high-quality images that display thin optical sections within thick fluorescent specimens. We define background as the detected light that originates outside a resolution volume and signal as the detected light that originates within the same volume. Background rejection is measured by the signal-to-background ratio (S/B) and is calculated for confocal, spinning-disk, line-illumination, slit-detection, and conventional fluorescence microscopes as a function of both the spatial filter size and the specimen thickness. Spatial filter sizes that reject background and optimize the signal-to-noise ratio (S/N) are calculated for each microscope. These calculations are normalized so that the time-averaged illumination at each point in the specimen is the same for each microscope. For thick specimens, we show that the S/B obtained with a confocal microscope can be more than 100 times greater than the S/B available with a conventional microscope, and we find that the optimal confocal S/N can be a factor of 10 greater than the S/N in the conventional microscope. C1 CORNELL UNIV, DEPT PHYS, ITHACA, NY 14853 USA. RP SANDISON, DR (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RI Webb, Watt/B-5905-2011 NR 26 TC 81 Z9 86 U1 1 U2 13 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 FEB 1 PY 1994 VL 33 IS 4 BP 603 EP 615 PG 13 WC Optics SC Optics GA MY625 UT WOS:A1994MY62500008 PM 20862055 ER PT J AU VARANASI, C SENGUPTA, S MCGINN, PJ SHI, DL AF VARANASI, C SENGUPTA, S MCGINN, PJ SHI, DL TI AN ALTERNATIVE METHOD TO INTRODUCE FINE Y2BACUO5 PRECIPITATES INTO YBA2CU3OX WITH ENHANCED FLUX-PINNING SO APPLIED SUPERCONDUCTIVITY LA English DT Article ID CRITICAL CURRENT-DENSITY; HIGH-JC; SUPERCONDUCTORS; MICROSTRUCTURE AB We have examined the effect of fine Y2BaCuO5 (211) precipitates on the flux pinning in textured YBa2Cu3Ox (123). We have used an alternative method to introduce fine Y2BaCuO5 (211) precipitates in YBa2Cu3Ox(123) without melting at high temperatures and without subsequent quenching as in the quench melt growth (QMG) process. Instead of generating the liquid by heating above 1200-degrees-C as in the QMG method, we obtain the liquid composition by a solid-state route at much lower temperatures. The microstructure achieved by using this alternative method is similar to that achieved by the quench-melt-growth process. We show that the fine 211 precipitates produced by this process can effectively enhance flux pinning. C1 UNIV NOTRE DAME,DEPT ELECT ENGN,NOTRE DAME,IN 46556. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP VARANASI, C (reprint author), UNIV NOTRE DAME,CTR MAT SCI & ENGN,NOTRE DAME,IN 46556, USA. NR 15 TC 11 Z9 11 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD FEB PY 1994 VL 2 IS 2 BP 117 EP 121 DI 10.1016/0964-1807(94)90028-0 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NP649 UT WOS:A1994NP64900005 ER PT J AU MEECHAM, WJ CHAR, DH KROLL, S CASTRO, JR BLAKELY, EA AF MEECHAM, WJ CHAR, DH KROLL, S CASTRO, JR BLAKELY, EA TI ANTERIOR SEGMENT COMPLICATIONS AFTER HELIUM ION RADIATION-THERAPY FOR UVEAL MELANOMA - RADIATION CATARACT SO ARCHIVES OF OPHTHALMOLOGY LA English DT Article ID ACCELERATED HEAVY-PARTICLES; DOSE FRACTIONATION; LENS; IRRADIATION AB Objective: To delineate the factors in the development of visually significant cataract after helium ion irradiation of eyes with uveal melanomas. Design: Retrospective analysis with multivariate analysis using life tables and Cox proportional hazard models in addition to other nonparametric techniques. Patients: All patients with a noncataractous other eye and adequate dosimetry data who were treated with helium ion irradiation. Results: Significant cataracts (grade 3+ or 4+ on a 0 to 4+ scale) developed in 129 patients (44%). The risk of cataract development peaked at 3 years (25% per person-year) and then declined to a sustained level of 7% to 9% per year after 7 years. In multivariate analysis, the percentage of lens included in the treatment port was the predominant predictive correlate with time to significant cataract (relative risk of 2.97 for a 25% increase in the percentage of lens in the treatment port). Patient age, preexisting cortical opacity, and ultrasound tumor height were also significant; ciliary body involvement and tumor dose had smaller effects. Kaplan-Meier analysis demonstrated an increased rate of cataractogenesis with each increment of the percentage of lens in the treatment port; when more than half of the lens was in the beam, the risk of cataract exceeded 90% within 7 years. Conclusions: Cataract development after helium ion irradiation is a function of the amount of the lens in the beam. Unlike neovascular glaucoma that develops mainly in the first few years after treatment, cataract continues to develop during the entire length of follow-up. C1 UNIV CALIF SAN FRANCISCO,DEPT RADIAT ONCOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,FRANCIS I PROCTOR FDN,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA. RP MEECHAM, WJ (reprint author), UNIV CALIF SAN FRANCISCO,DEPT OPHTHALMOL,OCULAR ONCOL UNIT,10 KIRKHAM ST,BOX 0730,SAN FRANCISCO,CA 94143, USA. FU NEI NIH HHS [EYO 7504] NR 37 TC 32 Z9 34 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9950 J9 ARCH OPHTHALMOL-CHIC JI Arch. Ophthalmol. PD FEB PY 1994 VL 112 IS 2 BP 197 EP 203 PG 7 WC Ophthalmology SC Ophthalmology GA MV882 UT WOS:A1994MV88200021 PM 8311772 ER PT J AU MCCALL, MR VANDENBERG, JJM KUYPERS, FA TRIBBLE, DL KRAUSS, RM KNOFF, LJ FORTE, TM AF MCCALL, MR VANDENBERG, JJM KUYPERS, FA TRIBBLE, DL KRAUSS, RM KNOFF, LJ FORTE, TM TI MODIFICATION OF LCAT ACTIVITY AND HDL STRUCTURE - NEW LINKS BETWEEN CIGARETTE-SMOKE AND CORONARY HEART-DISEASE RISK SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE LECITHIN-CHOLESTEROL ACYLTRANSFERASE; REVERSE CHOLESTEROL TRANSPORT; HDL; CIGARETTE SMOKE; CORONARY HEART DISEASE ID LECITHIN-CHOLESTEROL ACYLTRANSFERASE; HIGH-DENSITY-LIPOPROTEIN; FATTY-ACIDS; A-L; METABOLISM; TRANSPORT; PROTEINS; PHYSIOLOGY AB The mechanism(s) through which smoking influences the progression of atherosclerosis is poorly understood. Recent evidence suggests that oxidants present in the gas phase of cigarette smoke are involved. We exposed human plasma to the filtered gas phase of cigarette smoke to assess its effects on plasma components involved in the antiatherogenic reverse cholesterol transport pathway. In our model, freshly isolated plasma (24 mL) was exposed to filtered air or gasphase cigarette smoke for up to 6 hours at 37 degrees C. Lecithin-cholesterol acyltransferase (LCAT) activity was dramatically inhibited by cigarette smoke. A single 15-minute exposure to the smoke from an eighth of a cigarette was sufficient to reduce LCAT activity by 7%; additional exposures resulted in further decreases in activity. At 6 hours, only 22% of control LCAT activity remained in plasma exposed to smoke. Compared with control, gas-phase cigarette smoke-exposed plasma possessed high-density lipoprotein (HDL) with increased (16%) negative charge and with cross-linked apolipoproteins AI and AII. These data demonstrate that gas-phase cigarette smoke can inhibit a key enzyme (LCAT) and modify an integral lipid transport particle (HDL) that are essential components for the normal function of the reverse cholesterol transport pathway. Gas-phase cigarette smoke-induced modification of the reverse cholesterol transport pathway may provide a new mechanistic link between cigarette smoke and coronary heart disease risk. C1 CHILDRENS HOSP,OAKLAND RES INST,OAKLAND,CA 94609. RP MCCALL, MR (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELY LAB,DEPT MOLEC & NUCL MED,DIV LIFE SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL-18574]; NIDDK NIH HHS [DK-32094] NR 35 TC 66 Z9 68 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD FEB PY 1994 VL 14 IS 2 BP 248 EP 253 PG 6 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MV735 UT WOS:A1994MV73500010 PM 8305416 ER PT J AU LUO, XC SCHRAMM, DN AF LUO, XC SCHRAMM, DN TI THE PHENOMENOLOGICAL STATUS OF LATE-TIME PHASE-TRANSITION MODELS AFTER COSMIC BACKGROUND-RADIATION ANISOTROPY MEASUREMENTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, THEORY; LARGE-SCALE STRUCTURE OF UNIVERSE ID LARGE-SCALE STRUCTURE; DIFFERENTIAL MICROWAVE RADIOMETER; COLD DARK MATTER; INFLATIONARY UNIVERSE; PERTURBATIONS; EVOLUTION; GALAXIES; HOT AB Some relatively model-independent results for structure formation via late time phase transitions (LTPT) are discussed. In particular, generic LTPT power spectra are presented. The implication of the recent COBE detection of the cosmic background radiation (CBR) anisotropy at large angular scales (greater than or similar to 7 degrees) and the tight upper limits from small angular scales (similar to 1 degrees) to LTPT models are discussed. Special attention is focused on the observational constraints and possible non-Gaussian signatures of CBR temperature anisotropies from LTPT and other non-Gaussian models. It is shown that while LTPT have been seriously constrained by the recent data, viable models do remain which provide more power on the 100-200 Mpc scales than do more traditional primordial Gaussian density fluctuation models. Tests for such models are presented, including possible anisotropies on angular scales less than 8'. C1 NASA, FERMILAB ASTROPHYS CTR, FERMILAB, BATAVIA, IL 60510 USA. RP UNIV CHICAGO, CTR ASTRON & ASTROPHYS, 5640 S ELLIS AVE, CHICAGO, IL 60637 USA. NR 45 TC 5 Z9 5 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD FEB 1 PY 1994 VL 421 IS 2 BP 393 EP 399 DI 10.1086/173658 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU542 UT WOS:A1994MU54200001 ER PT J AU ARONS, J TAVANI, M AF ARONS, J TAVANI, M TI RELATIVISTIC PARTICLE-ACCELERATION IN PLERIONS SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT International-Astronomical-Union Colloquium 142 CY JAN 11-15, 1993 CL COLL PK, MD SP INT ASTRON UNION DE ACCELERATION OF PARTICLES; ISM, INDIVIDUAL (CRAB NEBULA); RELATIVITY; SHOCK WAVES ID ELECTRON-POSITRON PLASMAS; CRAB-NEBULA; MILLISECOND PULSAR; MAGNETOHYDRODYNAMIC MODEL; SHOCK ACCELERATION; MAGNETIC-FIELD; HIGH-ENERGY; PSR1957+20; BINARY; SOLITONS AB We discuss recent research on the structure and particle acceleration properties of relativistic shock waves in which the magnetic field is transverse to the now direction in the upstream medium, and whose composition is either pure electrons and positrons or primarily electrons and positrons with an admixture of heavy ions. Particle-in-cell simulation techniques as well as analytic theory have been used to show that such shocks in pure pair plasmas are fully thermalized-the downstream particle spectra are relativistic Maxwellians at the temperature expected from the jump conditions. On the other hand, shocks containing heavy ions which are a minority constituent by number but which carry most of the energy density in the upstream medium do put similar to 20% of the flow energy into a nonthermal population of pairs downstream, whose distribution in energy space is N(E) proportional to E(-2), where N(E)dE is the number of particles with energy between E and E + dE. The mechanism of thermalization and particle acceleration is found to be synchrotron maser activity in the shock front, stimulated by the quasi-coherent gyration of the whole particle population as the plasma flowing into the shock reflects from the magnetic field in the shock front. The synchrotron maser modes radiated by the heavy ions are absorbed by the pairs at their (relativistic) cyclotron frequencies, allowing the maximum energy achievable by the pairs to be gamma(+/-)m(+/-)c(2) = m(i)c(2) gamma(1)/Z(i), where gamma(1), is the Lorentz factor of the upstream now and Z(i) is the atomic number of the ions. The shock's spatial structure is shown to contain a series of ''overshoots'' in the magnetic field, regions where the gyrating heavy ions compress the magnetic field to levels in excess of the eventual downstream value. This shock model is applied to an interpretation of the structure of the inner regions of the Crab Nebula, in particular to the ''wisps,'' surface brightness enhancements near the pulsar. We argue that these surface brightness enhancements are the regions of magnetic overshoot, which appear brighter because the small Larmor radius pairs are compressed and radiate more efficiently in the regions of more intense magnetic field. This interpretation suggests that the structure of the shock terminating the pulsar's wind in the Crab Nebula is spatially resolved, and allows one to measure gamma(1), and a number of other properties of the pulsar's wind. We also discuss applications of the shock theory to the termination shocks of the winds from rotation-powered pulsars embedded in compact binaries. We show that this model adequately accounts for (and indeed predicted) the recently discovered X-ray flux from PSR 1957+20, and we discuss several other applications to other examples of these systems. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLASMA PHYS,LIVERMORE,CA. LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST,LIVERMORE,CA. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RP ARONS, J (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,601 CAMPBELL HALL,BERKELEY,CA 94720, USA. OI Tavani, Marco/0000-0003-2893-1459 NR 45 TC 32 Z9 33 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 FEB PY 1994 VL 90 IS 2 BP 797 EP 806 DI 10.1086/191905 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MT954 UT WOS:A1994MT95400038 ER PT J AU SYLVESTER, RJ BARLOW, MJ SKINNER, CJ AF SYLVESTER, RJ BARLOW, MJ SKINNER, CJ TI MILLIMETER PHOTOMETRY AND INFRARED-SPECTROSCOPY OF VEGA-EXCESS STARS SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 1st International Conference on Planetary Systems: Formation, Evolution, and Detection CY DEC 08-10, 1992 CL JET PROPULS LAB, PASADENA, CA SP NASA HO JET PROPULS LAB ID DISK AB JCMT millimetre-wave detections have been obtained for 11 Vega-excess stars having spectral types ranging from B9 to K5. UKIRT 10-mum spectra have been obtained for two of the sources, SAO 179815 and SAO 186777. The spectrum of SAO 179815 shows an unusually broad and diffuse silicate emission feature, whilst SAO 186777 shows the unidentified infrared (UIR) features, which are usually attributed to hydrocarbon vibrational modes. The mm photometry, along with optical, IRAS and near-IR photometry (much of the latter recently obtained by the authors), have been used to define the spectral energy distributions of the objects. A number of them show a 1-5 mum excess in addition to the longer wavelength excess. Values of the fractional excess luminosity, L(dust)/L*, have been derived from the spectral energy distributions; they exhibit a substantial range, from approximately 10(-5) up to almost 0.5, the theoretical maximum for a passive optically thick flared disc. Radiative transfer models have been constructed for several sources. One needs a well defined overall energy distribution, 10- and/or 20-mum spectra, and sub-mm and mm photometry in order to significantly constrain the model free parameters (disc density distribution, grain size power-law index, minimum and maximum grain radii). C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP SYLVESTER, RJ (reprint author), UNIV LONDON UNIV COLL,DEPT PHYS & ASTRON,LONDON WC1E 6BT,ENGLAND. RI Barlow, Michael/A-5638-2009 OI Barlow, Michael/0000-0002-3875-1171 NR 6 TC 13 Z9 13 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD FEB PY 1994 VL 212 IS 1-2 BP 261 EP 270 DI 10.1007/BF00984530 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT282 UT WOS:A1994NT28200030 ER PT J AU POLICASTRO, AJ DUNN, WE CARHART, RA AF POLICASTRO, AJ DUNN, WE CARHART, RA TI A MODEL FOR SEASONAL AND ANNUAL COOLING-TOWER IMPACTS SO ATMOSPHERIC ENVIRONMENT LA English DT Article DE ENVIRONMENTAL IMPACTS OF ENERGY GENERATION; COOLING TOWER; PLUME MODEL; DRIFT DEPOSITION; FOGGING; ICING; SHADOWING ID DISPERSION; PLUMES AB The Argonne National Laboratory/University of Illinois Seasonal/Annual Cooling Tower Impacts model provides predictions of seasonal, monthly, and annual cooling tower impacts from any number of mechanical- or natural-draft cooling towers. The model typically requires five years of hourly surface meteorological data and concurrent twice-daily mixing heights in addition to basic data on the thermal performance of the cooling tower. The model predicts average plume length, rise, drift deposition, fogging, icing, and shadowing. The model uses a category scheme in which the five years of hourly surface data are placed into about 100 categories based on a special plume-scaling relationship. With this reduced number of cases to be run for long-term impact evaluations, advanced state-of-the-art models for plume impacts are then applied. For multiple plumes, the methodology includes variation of the merging patterns and of the wake effects from tower housings for different wind directions. The main advantage to this model over previous models is its advanced theoretical development and extensive model validation with experimental data for its component submodels. From studies in the United States of America and Europe, an extensive database on cooling tower plumes and drift was accumulated and analysed to assist in the identification of superior theoretical assumptions. Other data, not used in model development, provided for independent model verification. The validation of each submodel is presented, and typical results are given for a representative natural-draft cooling tower installation and for a typical linear mechanical-draft cooling tower arrangement. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. UNIV ILLINOIS,DEPT MECH ENGN,CHAMPAIGN,IL 61820. RP POLICASTRO, AJ (reprint author), ARGONNE NATL LAB,DIV ENVIRONM ASSESSMENT & INFORMAT SCI,ARGONNE,IL 60439, USA. NR 50 TC 5 Z9 13 U1 2 U2 5 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 FEB PY 1994 VL 28 IS 3 BP 379 EP 395 DI 10.1016/1352-2310(94)90118-X PG 17 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NR213 UT WOS:A1994NR21300001 ER PT J AU ALLWINE, KJ WHITEMAN, CD AF ALLWINE, KJ WHITEMAN, CD TI SINGLE-STATION INTEGRAL MEASURES OF ATMOSPHERIC STAGNATION, RECIRCULATION AND VENTILATION SO ATMOSPHERIC ENVIRONMENT LA English DT Article DE AIR POLLUTION TRANSPORT; COMPLEX TERRAIN METEOROLOGY; AIRSHED CARRYING CAPACITY; PLUME TRAJECTORIES AB Mathematical definitions of integral quantities used to characterize the stagnation, recirculation and ventilation potential of various airsheds are proposed. These integral quantities can be calculated from wind data collected at fixed time intervals and at fixed heights in the atmosphere, and could be calculated, for example, from data from ground-based remote wind profilers. These integral quantities, since they are calculated from data at single stations, provide useful characterizations of the flow at individual measurement points, but are true measures of the transport of a plume only under idealized homogeneous wind conditions. The utility of these single-station measures for characterizing the air pollution transport potential of an airshed is illustrated using three months of hourly surface and radar profiler measurements of horizontal wind speed and direction collected at three locations in the Colorado Plateaus Basin region of Arizona during the winter of 1990. A surface station at Bullfrog Basin, located on a sheltered basin floor and exposed to diurnal wind systems, experienced stagnations 62% of the time, recirculations 34% of the time, and ventilations 8% of the time. A surface station at Desert View, located on the south rim of the Grand Canyon and exposed to synoptic-scale wind systems, experienced stagnations 8% of the time, recirculations 4% of the time, and ventilations 35% of the time. A radar profiler station at Page, Arizona, experienced stagnations about 20% of the time and recirculations about 25% of the time during the winter at heights below approximately 400 m a.g.l.; above this height, to levels near 1100 m a.g.l. (the approximate height of surrounding plateaus), the frequency of stagnations and recirculations dropped rapidly, and the frequency of ventilations ranged from 40 to 70%. RP ALLWINE, KJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 3 TC 42 Z9 46 U1 1 U2 8 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 FEB PY 1994 VL 28 IS 4 BP 713 EP 721 DI 10.1016/1352-2310(94)90048-5 PG 9 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NR214 UT WOS:A1994NR21400016 ER PT J AU MASTRANGELO, IA BEZANILLA, M HANSMA, PK HOUGH, PVC HANSMA, HG AF MASTRANGELO, IA BEZANILLA, M HANSMA, PK HOUGH, PVC HANSMA, HG TI STRUCTURES OF LARGE T-ANTIGEN AT THE ORIGIN OF SV40 DNA-REPLICATION BY ATOMIC-FORCE MICROSCOPY SO BIOPHYSICAL JOURNAL LA English DT Article ID LARGE TUMOR-ANTIGEN; VIRUS-40; BINDING; MOLECULES; HEXAMERS AB For inorganic crystals such as calcite (CaCO3), Atomic Force Microscopy (AFM) has provided surface structure at atomic resolution (Ohnesorge and Binnig, 1993). As part of a broad effort to obtain high resolution for an individual protein or protein assembly (Binnig et al., 1986; Rugar and Hansma, 1990; Radmacher et al., 1992), we applied AFM to study the ATP-dependent double hexamer of SV40 large T antigen, which assembles around the viral origin of DNA replication. Multimeric mass has been determined in two-dimensional projected images by Scanning Transmission Electron Microscopy (STEM) (Mastrangelo et al., 1989). By AFM, if the DNA-protein preparation has been stained positively by uranyl acetate, the contour at the junction between hexamers is visible as a cleft, 2-4 nm deep. The cleft, whether determined as a fraction of height by AFM or as a fraction of mass thickness by STEM, is of comparable magnitude. On either side of the cleft, hexamers attain a maximum height of 13-16 nm. Monomers found in the absence of ATP show heights of 5-7 nm. Taken together, the z coordinates provide a surface profile of complete and partial replication assemblies consistent with the spatial distribution of recognition pentanucleotides on the DNA, and they contribute direct geometrical evidence for a ring-like hexamer structure. C1 UNIV CALIFORNIA,DEPT PHYS,SANTA BARBARA,CA 93106. RP MASTRANGELO, IA (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 30 TC 29 Z9 29 U1 1 U2 2 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP 293 EP 298 PG 6 WC Biophysics SC Biophysics GA MU275 UT WOS:A1994MU27500004 PM 8161681 ER PT J AU SAXTON, MJ AF SAXTON, MJ TI ANOMALOUS DIFFUSION DUE TO OBSTACLES - A MONTE-CARLO STUDY SO BIOPHYSICAL JOURNAL LA English DT Article ID LATERAL DIFFUSION; DISORDERED MEDIA; SCALE-INVARIANCE; PERCOLATION; ARCHIPELAGO; KINETICS; MOTION; MOBILE AB In normal lateral diffusion, the mean-square displacement of the diffusing species is proportional to time. But in disordered systems anomalous diffusion may occur, in which the mean-square displacement is proportional to some other power of time. In the presence of moderate concentrations of obstacles, diffusion is anomalous over short distances and normal over long distances. Monte Carlo calculations are used to characterize anomalous diffusion for obstacle concentrations between zero and the percolation threshold. As the obstacle concentration approaches the percolation threshold, diffusion becomes more anomalous over longer distances; the anomalous diffusion exponent and the crossover length both increase. The crossover length and time show whether anomalous diffusion can be observed in a,given experiment. C1 LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. RP SAXTON, MJ (reprint author), UNIV CALIF DAVIS,INST THEORET DYNAM,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GM38133] NR 30 TC 381 Z9 386 U1 1 U2 31 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP 394 EP 401 PG 8 WC Biophysics SC Biophysics GA MU275 UT WOS:A1994MU27500017 PM 8161693 ER PT J AU ANDERSON, KK HOBBS, JD RYBA, GN MAJUMDER, SA MEDFORTH, CJ FORSYTH, IP SMITH, KM KADISH, KM SHELNUTT, JA AF ANDERSON, KK HOBBS, JD RYBA, GN MAJUMDER, SA MEDFORTH, CJ FORSYTH, IP SMITH, KM KADISH, KM SHELNUTT, JA TI PROPERTIES OF NONPLANAR HALOGENATED DODECAPHENYLPORPHYRINS EFFECTED BY ELECTRON-WITHDRAWING SUBSTITUENTS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. RI Shelnutt, John/A-9987-2009; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Smith, Kevin/0000-0002-6736-4779 NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A137 EP A137 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200790 ER PT J AU ARNOLD, GE PAULSEN, MD ORNSTEIN, RL AF ARNOLD, GE PAULSEN, MD ORNSTEIN, RL TI HYDROXYLATION PROFILE OF RACEMIC NORCAMPHOR BY CYTOCHROME P450CAM - A MOLECULAR-DYNAMICS SIMULATION PREDICTION OF REGIO PRODUCT SPECIFICITY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 MSRC,PNL,RICHLAND,WA 99352. NR 2 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A392 EP A392 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202276 ER PT J AU BARSKY, D PUTZ, B SCHULTEN, K SCHOENIGER, J HSU, E BLACKBAND, S AF BARSKY, D PUTZ, B SCHULTEN, K SCHOENIGER, J HSU, E BLACKBAND, S TI DIFFUSION OF LIQUIDS IN NMR MICROSCOPY - MECHANISMS OF CONTRAST AND TISSUE CHARACTERIZATION SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV ILLINOIS,URBANA,IL 61801. SANDIA NATL LABS,LIVERMORE,CA 94550. JOHNS HOPKINS UNIV,BALTIMORE,MD 21205. RI Schulten, Klaus/D-5561-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A278 EP A278 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201611 ER PT J AU BASH, PA AF BASH, PA TI COMPUTATIONAL ANALYSIS OF THE ENZYME REACTION IN MALATE-DEHYDROGENASE USING A HYBRID QUANTUM-CLASSICAL METHOD SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A130 EP A130 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200754 ER PT J AU BERRY, EA SHULMEISTER, VM HUANG, LS KIM, SH AF BERRY, EA SHULMEISTER, VM HUANG, LS KIM, SH TI DIFFRACTION STUDIES OF HEXAGONAL AND ORTHORHOMBIC CRYSTALS OF UBIQUINOL - CYTOCHROME-C OXIDOREDUCTASE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A364 EP A364 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202112 ER PT J AU BRITT, M AF BRITT, M TI A SHIFTING SPECIFICITY MODEL FOR ENZYME CATALYSIS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A266 EP A266 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201543 ER PT J AU CAO, H RORSCHACH, HE HAZLEWOOD, CF SHAPIRO, S THURSTON, T AF CAO, H RORSCHACH, HE HAZLEWOOD, CF SHAPIRO, S THURSTON, T TI PROTEIN DYNAMICS IN CRYSTALS AND IN SOLUTION USING THE INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING TECHNIQUE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 RICE UNIV,HOUSTON,TX 77251. BAYLOR COLL MED,HOUSTON,TX 77030. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A401 EP A401 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202332 ER PT J AU CATASTI, P BRADBURY, EM GUPTA, G AF CATASTI, P BRADBURY, EM GUPTA, G TI STRUCTURAL POLYMORPHISM OF THE HIV-MN-V3 LOOP SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LANL,DIV LIFE SCI,LOS ALAMOS,NM. NR 0 TC 0 Z9 0 U1 1 U2 1 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A135 EP A135 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200781 ER PT J AU CAUSGROVE, TP DYER, RB AF CAUSGROVE, TP DYER, RB TI PROTEIN DYNAMICS COUPLED TO CO PHOTODISSOCIATION FROM CARBONMONOXYMYOGLOBIN PROBED BY TIME-RESOLVED INFRARED-SPECTROSCOPY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A362 EP A362 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202101 ER PT J AU CHAN, SS KERGIL, D TREWHELLA, J AUSTIN, RH BRESLAUER, KJ HOGAN, ME AF CHAN, SS KERGIL, D TREWHELLA, J AUSTIN, RH BRESLAUER, KJ HOGAN, ME TI TEMPERATURE-DEPENDENT SMALL-ANGLE X-RAY-SCATTERING OF A 45-MER DUPLEX WITH A-TRACTS IN SOLUTION SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. BAYLOR COLL MED,CTR BIOTECH,HOUSTON,TX 77030. RUTGERS STATE UNIV,DEPT CHEM,PISCATAWAY,NJ 08855. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A368 EP A368 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202138 ER PT J AU DORELEIJERS, JF TUNG, CS SOUMPASIS, DM AF DORELEIJERS, JF TUNG, CS SOUMPASIS, DM TI QUANTITATIVE DESCRIPTION OF DNA SHAPE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RI Doreleijers, Jurgen/E-5113-2012 NR 2 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A231 EP A231 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201345 ER PT J AU DUNN, RC ALLEN, EV XIE, XS AF DUNN, RC ALLEN, EV XIE, XS TI FLUORESCENCE IMAGING OF SINGLE PROTEINS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A228 EP A228 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201324 ER PT J AU FERNANDEZVELASCO, JG BERRY, EA MALKIN, R AF FERNANDEZVELASCO, JG BERRY, EA MALKIN, R TI KINETIC RESOLUTION OF SPECTRALLY DISTINCT BH AND BL HEMES IN THE B6F COMPLEX OF STROMAL VESICLES FROM SPINACH-CHLOROPLASTS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,DEPT PLANT BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A227 EP A227 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201320 ER PT J AU FONTENOT, JD MARIAPPAN, SVS CATASTI, P DOMENECH, N FINN, OJ GUPTA, G AF FONTENOT, JD MARIAPPAN, SVS CATASTI, P DOMENECH, N FINN, OJ GUPTA, G TI ELONGATED STRUCTURE OF THE HUMAN MUCIN MUC-1 TANDEM REPEAT DOMAIN SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV PITTSBURGH,PITTSBURGH,PA 15216. NR 0 TC 0 Z9 0 U1 1 U2 1 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A28 EP A28 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200152 ER PT J AU FRAUENFELDER, H AF FRAUENFELDER, H TI PROTEIN DYNAMICS AND INFRARED-SPECTROSCOPY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A251 EP A251 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201459 ER PT J AU GAILEY, PC AF GAILEY, PC TI SPATIAL COHERENCE OF THERMAL ELECTRICAL NOISE AT THE GAP JUNCTION INTERFACE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A259 EP A259 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201500 ER PT J AU GARCIA, AE HUMMER, G SOUMPASIS, DM AF GARCIA, AE HUMMER, G SOUMPASIS, DM TI THEORETICAL DESCRIPTION OF PROTEIN HYDRATION - A POTENTIAL OF MEAN FORCE CALCULATION BASED ON 2 AND 3 PARTICLE CORRELATION-FUNCTIONS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. MAX PLANCK INST BIOPHYS CHEM,DEPT MOLEC BIOL,D-37018 GOTTINGEN,GERMANY. RI Hummer, Gerhard/A-2546-2013 OI Hummer, Gerhard/0000-0001-7768-746X NR 0 TC 3 Z9 3 U1 0 U2 2 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A130 EP A130 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200752 ER PT J AU GRAY, DM GRAY, CW MARK, BL POWELL, MD VAUGHAN, MR AF GRAY, DM GRAY, CW MARK, BL POWELL, MD VAUGHAN, MR TI SMALL-ANGLE X-RAY-SCATTERING OF FD GENE-5-PROTEIN - NUCLEIC-ACID COMPLEXES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV TEXAS,RICHARDSON,TX 75083. LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A35 EP A35 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200194 ER PT J AU HOBBS, JD ANDERSON, KK LUO, L QUIRKE, JME LARSEN, RW SHELNUTT, JA AF HOBBS, JD ANDERSON, KK LUO, L QUIRKE, JME LARSEN, RW SHELNUTT, JA TI A MOLECULAR MECHANICS AND RESONANCE RAMAN INVESTIGATION OF THE CONSERVED NONPLANAR HEME DISTORTION IN CYTOCHROMES-C SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. FLORIDA INT UNIV,MIAMI,FL 33199. UNIV HAWAII,HONOLULU,HI 96822. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A268 EP A268 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201553 ER PT J AU HUD, NV DOWNING, KH BALHORN, R AF HUD, NV DOWNING, KH BALHORN, R TI A MODEL FOR DNA ARRANGEMENT IN MULTIVALENT CATION TOROIDAL CONDENSATES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 1 U2 2 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A370 EP A370 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202147 ER PT J AU HUMMER, G GARCIA, AE SOUMPASIS, DM AF HUMMER, G GARCIA, AE SOUMPASIS, DM TI THE HYDRATION OF A-DNA, B-DNA, AND Z-DNA STUDIED WITH THE POTENTIALS OF MEAN FORCE APPROACH SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP T10,LOS ALAMOS,NM 87545. MAX PLANCK INST BIOPHYS CHEM,DEPT MOLEC BIOL,D-37018 GOTTINGEN,GERMANY. RI Hummer, Gerhard/A-2546-2013 OI Hummer, Gerhard/0000-0001-7768-746X NR 0 TC 4 Z9 4 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A25 EP A25 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200140 ER PT J AU KALMAN, K TSENGCRANK, J CHANDY, G MOHRENWEIZER, H BRANDRIFF, B AIYAR, J GUTMAN, GA CHANDY, KG AF KALMAN, K TSENGCRANK, J CHANDY, G MOHRENWEIZER, H BRANDRIFF, B AIYAR, J GUTMAN, GA CHANDY, KG TI MOLECULAR AND BIOPHYSICAL CHARACTERIZATION OF A NOVEL SHAKER-RELATED ISLET-CELL K+ CHANNEL GENE, KV1.7, LOCATED ON HUMAN CHROMOSOME-19Q13.3 SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UCI,DEPT PHYSIOL & BIOPHYS,IRVINE,CA 92717. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. GLAXO RES LABS,RES TRIANGLE PK,NC. NR 0 TC 0 Z9 0 U1 0 U2 2 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A109 EP A109 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200627 ER PT J AU LEE, JW OWENS, TG LAIBLE, PD GREENBAUM, E AF LEE, JW OWENS, TG LAIBLE, PD GREENBAUM, E TI THE EFFECT OF PLATINIZATION ON EXCITATION TRANSFER DYNAMICS AND P700 PHOTOOXIDATION KINETICS IN ISOLATED PHOTOSYSTEM-I SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. CORNELL UNIV,ITHACA,NY 14853. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A228 EP A228 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201328 ER PT J AU MAJUMDER, SA MIURA, M HOBBS, JD SHELNUTT, JA AF MAJUMDER, SA MIURA, M HOBBS, JD SHELNUTT, JA TI AGGREGATION AND COMPLEXATION PROPERTIES OF NONPLANAR WATER-SOLUBLE OCTAACETIC ACID-TETRAPHENYLPORPHYRIN SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A137 EP A137 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200793 ER PT J AU MAKHOV, A HANNAH, J BRENNAN, M TRUS, B KOCSIS, E CONWAY, J WINGFIELD, P SIMON, M STEVEN, A AF MAKHOV, A HANNAH, J BRENNAN, M TRUS, B KOCSIS, E CONWAY, J WINGFIELD, P SIMON, M STEVEN, A TI FILAMENTOUS HEMAGGLUTININ OF BORDETELLA-PERTUSSIS - MONOMERIC HAIRPIN MODEL OF A BACTERIAL ADHESIN SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 NIAMS,BETHESDA,MD 20892. US FDA,DBP,BETHESDA,MD 20892. NIH,DCRT,BETHESDA,MD 20892. NIH,OD,BETHESDA,MD 20892. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 1 Z9 1 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A341 EP A341 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201983 ER PT J AU MANIVANNAN, K GUDOWSKANOWAK, E MATHIAS, RT AF MANIVANNAN, K GUDOWSKANOWAK, E MATHIAS, RT TI A STOCHASTIC MARKOVIAN MODEL TO DESCRIBE COOPERATIVE BEHAVIOR IN ION-CHANNEL GATING SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SUNY STONY BROOK,DEPT PHYSIOL & BIOPHYS,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RI Gudowska-Nowak, Ewa/A-7622-2014 OI Gudowska-Nowak, Ewa/0000-0001-5604-094X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A354 EP A354 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202057 ER PT J AU OLAH, GA TREWHELLA, J AF OLAH, GA TREWHELLA, J TI THE STRUCTURE OF 4CA2+ CENTER-DOT-TROPONIN-C COMPLEXED WITH TROPONIN-I BY SMALL-ANGLE SCATTERING SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. NR 1 TC 3 Z9 4 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A311 EP A311 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201807 ER PT J AU POLEWSKI, K KRAMER, SL SUTHERLAND, JC AF POLEWSKI, K KRAMER, SL SUTHERLAND, JC TI TIME-RESOLVED FLUORESCENCE WITH SYNCHROTRON SOURCE EXCITATION - IMPROVED STABILITY OF PULSE-WIDTH USING A POWERED 4TH-HARMONIC CAVITY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. BROOKHAVEN NATL LAB,NSLS,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A161 EP A161 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200933 ER PT J AU RAY, S WOLF, SG HOWARD, J DOWNING, KH AF RAY, S WOLF, SG HOWARD, J DOWNING, KH TI KINESIN DOES NOT MOVE ALONG ZINC-MACROTUBES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV WASHINGTON,DEPT PHYSIOL & BIOPHYS,SEATTLE,WA 98195. LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RI Howard, Jonathon /D-4229-2011; Howard, Jonathon/J-7492-2016; WOLF, SHARON/K-1768-2012 OI Howard, Jonathon /0000-0003-0086-1196; Howard, Jonathon/0000-0003-0086-1196; WOLF, SHARON/0000-0002-5337-5063 NR 1 TC 2 Z9 2 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A312 EP A312 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201811 ER PT J AU SAXTON, MJ AF SAXTON, MJ TI ANOMALOUS DIFFUSION DUE TO BINDING - A MONTE-CARLO STUDY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF DAVIS,INST THEORET DYNAM,DAVIS,CA 95616. LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A61 EP A61 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200346 ER PT J AU SAXTON, MJ AF SAXTON, MJ TI SINGLE-PARTICLE TRACKING IN AN ARCHIPELAGO SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF DAVIS,INST THEORET DYNAM,DAVIS,CA 95616. LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 1 U2 1 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A18 EP A18 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200099 ER PT J AU SCHIFFER, M DENG, YL AINSWORTH, C PASCOE, FH HANSON, DK AF SCHIFFER, M DENG, YL AINSWORTH, C PASCOE, FH HANSON, DK TI EXTENSION OF STRUCTURAL-ANALYSIS OF THE BACTERIAL REACTION-CENTER BY SITE-DIRECTED AND COMPENSATORY MUTATIONS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 ARGONNE NATL LAB,CMB,ARGONNE,IL 60439. COLL ST FRANCIS,JOLIET,IL 60435. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A2 EP A2 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200006 ER PT J AU SELVIN, PR KLEIN, MP HEARST, JE AF SELVIN, PR KLEIN, MP HEARST, JE TI IMPROVED FLUORESCENCE ENERGY-TRANSFER USING LANTHANIDE CHELATES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,CALVIN LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A237 EP A237 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201380 ER PT J AU SHOWALTER, MC ERKKILA, KE SHELNUTT, JA AF SHOWALTER, MC ERKKILA, KE SHELNUTT, JA TI FLUORINATED IRON DODECAPHENYLPORPHYRINS AS ALKANE-OXIDATION CATALYSTS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A138 EP A138 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200797 ER PT J AU SONG, XZ HOBBS, JD ANDERSON, KA XU, X CESARANO, J SHELNUTT, JA AF SONG, XZ HOBBS, JD ANDERSON, KA XU, X CESARANO, J SHELNUTT, JA TI NICKEL LIPOPORPHYRIN-STEARIC ACID LANGMUIR-BLODGETT-FILMS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A262 EP A262 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201517 ER PT J AU STONE, DB SCHNEIDER, DK MENDELSON, RA AF STONE, DB SCHNEIDER, DK MENDELSON, RA TI NEUTRON-SCATTERING FROM REDUCTIVELY METHYLATED MYOSIN SUBFRAGMENT-1 SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,CARDIOVASC RES INST,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT BIOCHEM & BIOPHYS,SAN FRANCISCO,CA 94143. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 2 Z9 2 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A76 EP A76 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200435 ER PT J AU SUBBARAO, SK MIURA, M ANDERSON, KK HOBBS, JD SHELNUTT, JA AF SUBBARAO, SK MIURA, M ANDERSON, KK HOBBS, JD SHELNUTT, JA TI DNA-METALLOPORPHYRIN PI-PI-INTERACTIONS IN INTERCALATED COMPLEXES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A137 EP A137 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200795 ER PT J AU TUNG, CS CARTER, ES AF TUNG, CS CARTER, ES TI NUCLEIC-ACID MODELING TOOL (NAMOT) - AN INTERACTIVE GRAPHIC TOOL FOR MODELING NUCLEIC-ACID STRUCTURES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A154 EP A154 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46200890 ER PT J AU WOODRUFF, WH DYER, RB CALLENDER, RH PAIGE, K CAUSGROVE, T AF WOODRUFF, WH DYER, RB CALLENDER, RH PAIGE, K CAUSGROVE, T TI FAST EVENTS IN PROTEIN-FOLDING - LASER T-JUMP - TIME-RESOLVED INFRARED STUDY OF THE RIBONUCLEASE-A S-PEPTIDE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. CUNY CITY COLL,DEPT PHYS,NEW YORK,NY 10031. NR 0 TC 7 Z9 7 U1 2 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 FEB PY 1994 VL 66 IS 2 BP A397 EP A397 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202306 ER PT J AU EHRMAN, CI HIMMEL, ME AF EHRMAN, CI HIMMEL, ME TI SIMULTANEOUS SACCHARIFICATION AND FERMENTATION OF PRETREATED BIOMASS - IMPROVING MASS-BALANCE CLOSURE SO BIOTECHNOLOGY TECHNIQUES LA English DT Article AB The successful implementation of simultaneous saccharification and fermentation (SSF) technology for biomass conversion to ethanol requires competent analysis of complex biomass process streams, often obtained at extremes of pH. In this study, optimal conditions for handling biomass samples recovered from acid and alkaline pretreatments prior to traditional compositional analysis were developed. Methods for processing slurries from SSF were also determined. In both cases, a mixed wastepaper feedstock was used to test improved handling procedures and to document recommended performance. C1 NATL RENEWABLE ENERGY LAB,DIV ALTERNAT FUELS,APPL BIOL SCI BRANCH,1617 COLE BLVD,GOLDEN,CO 80401. NR 11 TC 17 Z9 17 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0951-208X J9 BIOTECHNOL TECH JI Biotechnol. Tech. PD FEB PY 1994 VL 8 IS 2 BP 99 EP 104 DI 10.1007/BF00152848 PG 6 WC Biochemical Research Methods; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA MX976 UT WOS:A1994MX97600006 ER PT J AU NASLUND, E RODEAN, HC NASSTROM, JS AF NASLUND, E RODEAN, HC NASSTROM, JS TI A COMPARISON BETWEEN 2 STOCHASTIC DIFFUSION-MODELS IN A COMPLEX 3-DIMENSIONAL FLOW SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID INHOMOGENEOUS TURBULENCE; PARTICLE TRAJECTORIES; DISPERSION; SIMULATION; EQUATION; LAYER; WAKE AB A Random Displacement Model (RDM) and a Langevin Equation Model (LEM) are used to simulate point releases in a complex flow around a building. The flow field is generated by a three-dimensional finite element model that uses the standard k-epsilon model to parameterize the turbulence. The RDM- and LEM-calculated concentration fields are compared, with particular emphasis on the structure in regions with high turbulence and/or recirculation. RDM and LEM results are similar qualitatively, but RDM tends to predict lower concentration levels. In part this is due to the higher early-time diffusion. However, the expected convergence at later times is prevented by the interaction of the diffusion with the strongly inhomogeneous mean flow. C1 EG&G,ENERGY MEASUREMENTS INC,PLEASANTON,CA 94558. NATL DEF RES ESTAB,S-90182 UMEA,SWEDEN. RP NASLUND, E (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,REG ATMOSPHER SCI DIV,LIVERMORE,CA 94550, USA. NR 28 TC 20 Z9 20 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD FEB PY 1994 VL 67 IS 4 BP 369 EP 384 DI 10.1007/BF00705439 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NB601 UT WOS:A1994NB60100003 ER PT J AU RODGERS, PW AF RODGERS, PW TI SELF-NOISE SPECTRA FOR 34 COMMON ELECTROMAGNETIC SEISMOMETER PREAMPLIFIER PAIRS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Note AB Because of a lack of such information, computed self-noise spectra are presented for a total of 34 frequently used electromagnetic-seismometer/preamplifier combinations. For convenience, most of these data are given in three sets of units. Peterson's Low Noise Model is included on each plot for comparison. The self noises of nine frequently employed electromagnetic seismometers properly matched to their operational amplifier (op-amp) preamplifiers are plotted. In terms of amplitude density spectra in (m/sec**2)/Hz**0.5, the values of the self-noise spectra at resonance range from a low of 3 x 10(-10) for the GS-13 to a high of 1.3 x 10(-8) for the HS-1. Between these two seismometers, in order of increasing noise at resonance, are the SV-1, SL-210V, S-13, SS-1, L-4C, S-6000CD, and the L-22D. To show which seismometers exhibit the lowest noise with which operational amplifier preamplifiers, the self noises of the HS-1, L-22D, L-4C, GS-13, SV-1, and SL-210V are plotted each paired with four commonly used op-amps: the LT 1 028, OP-227, OP-77, and the LT1012. For the GS-13, the LT1012 was the quietest. For the rest, the OP-227 was the best. For a given seismometer, the differences in self noise between op-amps were frequently a factor of 2 or 3, and as large as 10 in one case. The use of these op-amps in the analog front ends of five current digital seismic recorders is discussed. C1 UNIV CALIF SANTA BARBARA,INST CRUSTAL STUDIES,SANTA BARBARA,CA 93106. RP RODGERS, PW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 9 TC 8 Z9 8 U1 0 U2 0 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD FEB PY 1994 VL 84 IS 1 BP 222 EP 228 PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MZ183 UT WOS:A1994MZ18300020 ER PT J AU ROY, C PAKDEL, H ZHANG, HG ELLIOTT, DC AF ROY, C PAKDEL, H ZHANG, HG ELLIOTT, DC TI CHARACTERIZATION AND CATALYTIC GASIFICATION OF THE AQUEOUS BY-PRODUCT FROM VACUUM PYROLYSIS OF BIOMASS SO CANADIAN JOURNAL OF CHEMICAL ENGINEERING LA English DT Article DE BIOMASS; RESIDUE; VACUUM PYROLYSIS; CATALYTIC GASIFICATION; AQUEOUS PHASE; CARBOXYLIC ACID; ANALYSIS ID WOOD; REACTOR AB Spruce wood residues were treated in a vacuum pyrolysis Process Development Unit with a throughput capacity of 28 kg/h. Two aqueous phase condensate samples with COD concentration varying between 190 and 255 g/L were produced and sequentially extracted with dichloromethane and ethylacetate solvents. The soluble organic matter was composed of acidic, phenolic, alcoholic and ketonic compounds. The insoluble fraction was sequentially distilled at 100 and 110-degrees-C under atmospheric pressure. Mainly water was recovered in the first distillate, while the second distillate contained 30.4% formic and acetic acids, 69.4% water and 0.2% residual organic compounds. The distillation residue was rich in oxygen and was essentially insoluble in any organic solvent. The two aqueous phase pyroligneous samples were treated in Battelle's Thermochemical Envirornmental Energy System (TEES(R)), a registered service mark of Onsite*Ofsite, Inc. of Duarte, California, U.S.A. The results of the tests showed that similar results were obtained with either feedstock. In batch tests a COD reduction of 99% was achieved. The product gas composition was typically about 49 % methane, 5 % hydrogen, 1% ethane and 45% carbon dioxide. Tests in a continuous stirred-tank reactor produced reproducible data which can be used for process scale-up. Catalyst lifetime was identified as needing further improvement. The preliminary results demonstrated the technical feasibility of the catalytic gasification process as a useful step in the recovery of energy from the secondary condensate stream and the cleanup of the by-product water from vacuum pyrolysis of wood. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP ROY, C (reprint author), UNIV LAVAL, DEPT CHEM ENGN, ST FOY G1K 7P4, PQ, CANADA. NR 20 TC 9 Z9 9 U1 1 U2 8 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0008-4034 J9 CAN J CHEM ENG JI Can. J. Chem. Eng. PD FEB PY 1994 VL 72 IS 1 BP 98 EP 105 PG 8 WC Engineering, Chemical SC Engineering GA NA310 UT WOS:A1994NA31000014 ER PT J AU TSCHAPLINSKI, TJ TUSKAN, GA GUNDERSON, CA AF TSCHAPLINSKI, TJ TUSKAN, GA GUNDERSON, CA TI WATER-STRESS TOLERANCE OF BLACK AND EASTERN COTTONWOOD CLONES AND 4 HYBRID PROGENY .1. GROWTH, WATER RELATIONS, AND GAS-EXCHANGE SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID OSMOTIC ADJUSTMENT; DROUGHT TOLERANCE; POPULUS-DELTOIDES; OSMOREGULATION; SELECTION; RESPONSES; POPLAR; LEAVES AB Water-stress tolerance of six clones in a pedigree consisting of black cottonwood (Populus trichocarpa Torr. and Gray, female) and eastern cottonwood (Populus deltoides Bartr., male) parental clones and four hybrid progeny was investigated. Trees were grown outdoors in pots; well-watered trees were kept moist (soil water potential greater than -0.03 MPa), and stressed trees (soil water potential less than -2.0 MPa) were subjected to repeated cyclical stress of 1 or 2 days duration over the 14-week study. Male P. deltoides and the male clone 242 displayed the greatest degree of stress tolerance, as evidenced by greater osmotic adjustment at saturation (0.25 MPa) and maintenance of relative growth rate of the main stem under water stress at 100 and 69% of that of well-watered trees, respectively, compared with reductions to 50-58% for the other hybrid clones. However, differences in total plant dry weight under water stress were less obvious, with female clones allocating more carbon to branch production under well-watered conditions, which was further increased under water stress. Three of the four hybrids displayed some degree of osmotic adjustment at saturation after bud set, which was likely conferred by male P. deltoides. Screening clones of Populus for drought tolerance should take into account the segregating tendency of hybrids to allocate carbon to lateral meristems under stress. RP TSCHAPLINSKI, TJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Tuskan, Gerald/A-6225-2011; OI Tuskan, Gerald/0000-0003-0106-1289; Tschaplinski, Timothy/0000-0002-9540-6622 NR 23 TC 47 Z9 50 U1 1 U2 6 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD FEB PY 1994 VL 24 IS 2 BP 364 EP 371 DI 10.1139/x94-049 PG 8 WC Forestry SC Forestry GA ND496 UT WOS:A1994ND49600020 ER PT J AU EBERHARDT, LL BLANCHARD, BM KNIGHT, RR AF EBERHARDT, LL BLANCHARD, BM KNIGHT, RR TI POPULATION TREND OF THE YELLOWSTONE GRIZZLY BEAR AS ESTIMATED FROM REPRODUCTIVE AND SURVIVAL RATES SO CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE LA English DT Article ID DYNAMICS AB The trend of the Yellowstone grizzly bear (Ursus arctos horribilis) population was estimated using reproductive rates calculated from 22 individual females and survival rates from 400 female bear-years. The point estimate of the rate of increase was 4.6%, with 95% confidence limits of 0 and 9%. Caution in interpreting this result is advised because of possible biases in the population parameter estimates. The main prospects for improving present knowledge of the population trend appear to be further study of possible biases in the parameter estimates, and the continued use of radiotelemetry to increase the number of samples on which the estimates are based. C1 MONTANA STATE UNIV, FORESTRY SCI LAB, INTERAGENCY GRIZZLY BEAR STUDY TEAM, BOZEMAN, MT 59717 USA. RP EBERHARDT, LL (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 11 TC 68 Z9 69 U1 5 U2 14 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4301 J9 CAN J ZOOL JI Can. J. Zool.-Rev. Can. Zool. PD FEB PY 1994 VL 72 IS 2 BP 360 EP 363 DI 10.1139/z94-049 PG 4 WC Zoology SC Zoology GA NR012 UT WOS:A1994NR01200024 ER PT J AU FISHER, DR AF FISHER, DR TI RADIATION-DOSIMETRY FOR RADIOIMMUNOTHERAPY - AN OVERVIEW OF CURRENT CAPABILITIES AND LIMITATIONS SO CANCER LA English DT Article; Proceedings Paper CT 9th Conference on Radioimmunodetection and Radioimmunotherapy of Cancer CY SEP 17-19, 1992 CL PRINCETON, NJ DE DOSIMETRY; RADIOIMMUNOTHERAPY; ABSORBED DOSE; MULTI-CELLULAR DOSIMETRY; MICRODOSIMETRY; MIRD SYSTEM ID ANTIBODIES; CANCER AB Background. The two major uncertainties associated with absorbed dose calculations involve: (1) measurement errors from assessment of radioactivity in specific organs and tissues by direct counting; and (2) application of standard anthropomorphic and biokinetic models for dose assessment. Uncertainties in direct counting result from the inherent difficulty of measuring radioactivity inside the body, Although the system recommended by the Medical Internal Radiation Dose (MIRD) Committee of the Society of Nuclear Medicine provides a general framework and conceptual basis for the dosimetry of administered radiopharmaceuticals, it does not provide complete methods for assessing some of the more important quantities of interest in radioimmunotherapy, such as dose to tumors and descriptions of spatial dose distributions within tissues. Current MIRD anthropomorphic models are only crude representations of the human body. Generalized biokinetic models used in the MIRD system may vary considerably from the actual biokinetics of radiolabeled compounds in the body. This review describes limitations of the present MIRD system for radioimmunotherapy; they include assumptions used in treatment planning and the lack of specific methods for tumor dosimetry, multi-cellular dosimetry, microdosimetry, small animal dosimetry, and uncertainty analysis. Conclusions. Treatment planning for radioimmunotherapy requires patient-specific organ models and customized biokinetic parameters. Improvements are also needed in marrow dosimetry to account for the amount and distribution of red marrow relative to that found in adjacent source regions, skeletal structures, and circulating blood. Simplified assumptions with regard to the locally absorbed fraction of beta-particle energy in tissues adjacent to source regions should not be used when depth-dose profiles are needed; for example, radiation absorbed doses to intestinal walls should be calculated over the entire mass of tissue or described by absorbed-dose distributions. Additional research is needed to develop improved measurement techniques and computational methods to assess more accurately internal dose distributions within tumors and normal tissues. RP FISHER, DR (reprint author), PACIFIC NW LAB, DEPT HLTH PHYS, K3-53,POB 999, RICHLAND, WA 99352 USA. FU NCI NIH HHS [CA18105, CA44991] NR 16 TC 27 Z9 28 U1 0 U2 2 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD FEB 1 PY 1994 VL 73 IS 3 SU S BP 905 EP 911 DI 10.1002/1097-0142(19940201)73:3+<905::AID-CNCR2820731324>3.0.CO;2-K PG 7 WC Oncology SC Oncology GA MV418 UT WOS:A1994MV41800023 PM 8306278 ER PT J AU HUI, TE FISHER, DR KUHN, JA WILLIAMS, LE NOURIGAT, C BADGER, CC BEATTY, BG BEATTY, JD AF HUI, TE FISHER, DR KUHN, JA WILLIAMS, LE NOURIGAT, C BADGER, CC BEATTY, BG BEATTY, JD TI A MOUSE MODEL FOR CALCULATING CROSS-ORGAN BETA-DOSES FROM YTTRIUM-90-LABELED IMMUNOCONJUGATES SO CANCER LA English DT Article; Proceedings Paper CT 9th Conference on Radioimmunodetection and Radioimmunotherapy of Cancer CY SEP 17-19, 1992 CL PRINCETON, NJ DE Y-90; BERGERS POINT KERNEL; BETA DOSIMETRY; MEDICAL INTERNAL RADIATION DOSE DOSIMETRY; MONOCLONAL ANTIBODIES; MOUSE MODEL; NUDE MICE; RADIOIMMUNOCONJUGATES; SMALL-SCALE DOSIMETRY ID HUMAN-COLON CANCER; ANTIGEN MONOCLONAL-ANTIBODY; NUDE-MICE; TUMOR MASS; XENOGRAFTS; RADIOIMMUNOTHERAPY; BIODISTRIBUTION; CARCINOMA AB Background. The organs of laboratory mice used in radioimmunotherapy experiments are relatively small compared to the ranges of high-energy yttrium-90 (Y-90) beta particles. Current Medical Internal Radiation Dose (MIRD) dosimetry methods do not account for beta energy that escapes an organ. A dosimetry model was developed to provide more realistic dose estimates for organs in mice who received Y-90-labeled antibodies by accounting for physical and geometric factors, loss of beta dose due to small organ sizes, and cross-organ doses. Methods. The dimensions, masses, surface areas, and overlapping areas of different organs of 10 athymic nude mice, each weighing approximately 25 g, were measured to form a realistic geometric model. Major organs in this model include the liver, spleen, kidneys, lungs, heart, stomach, small intestine, large intestine, thyroid, pancreas, bone, marrow, and carcass. A subcutaneous tumor mass also was included in the model. By accounting for small organ absorbed fractions and cross-organ beta doses, the MIRD methodology was extended from humans to mice for beta dose calculations. Results. Absorbed fractions of beta energy were calculated using the Berger's point kernels and the electron transport code EGS4. Except for the tumor and carcass, the self-organ absorbed fractions ranged from 15% to 20% in smaller organs (the marrow and thyroid) to 65%-70% in larger organs (the liver and small intestine). Cross-organ absorbed fractions also were calculated from estimates of the overlapping surface areas between organs. Conclusion. The mathematic mouse model presented here provides more realistic organ dosimetry of radiolabeled monoclonal antibodies in the nude mouse, which should, in turn, contribute to a better understanding of the correlation of biodistribution study results and organ-tumor toxicity information. C1 CITY HOPE NATL MED CTR, DIV GEN & ONCOL SURG, DUARTE, CA USA. CITY HOPE NATL MED CTR, DIV RADIOL, DUARTE, CA USA. FRED HUTCHINSON CANC RES CTR, DIV CLIN RES, SEATTLE, WA 98104 USA. RP HUI, TE (reprint author), PACIFIC NW LAB, DEPT HLTH PHYS, POB 999, RICHLAND, WA 99352 USA. FU NCI NIH HHS [CA09477, CA33572, CA43904] NR 23 TC 81 Z9 85 U1 0 U2 4 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD FEB 1 PY 1994 VL 73 IS 3 SU S BP 951 EP 957 PG 7 WC Oncology SC Oncology GA MV418 UT WOS:A1994MV41800029 PM 8306284 ER PT J AU BEATTY, BG KUHN, JA HUI, TE FISHER, DR WILLIAMS, LE BEATTY, JD AF BEATTY, BG KUHN, JA HUI, TE FISHER, DR WILLIAMS, LE BEATTY, JD TI APPLICATION OF THE CROSS-ORGAN BETA-DOSE METHOD FOR TISSUE DOSIMETRY IN TUMOR-BEARING MICE TREATED WITH A Y-90 LABELED IMMUNOCONJUGATE SO CANCER LA English DT Article; Proceedings Paper CT 9th Conference on Radioimmunodetection and Radioimmunotherapy of Cancer CY SEP 17-19, 1992 CL PRINCETON, NJ DE MONOCLONAL ANTIBODIES; CARCINOEMBRYONIC ANTIGEN; Y-90; SMALL SCALE DOSIMETRY; TUMOR; NUDE MICE; RADIOIMMUNOTHERAPY ID HUMAN-COLON CANCER; I-131-LABELED MONOCLONAL-ANTIBODIES; CARCINOEMBRYONIC ANTIGEN-ANTIBODY; NUDE-MICE; RADIOIMMUNOTHERAPY; XENOGRAFTS; THERAPY AB Background. Radioimmunotherapy of nude mice bearing human tumor xenografts using Y-90-labeled monoclonal antibodies has resulted in slower tumor growth, decreased turner burden, and increased survival times. Dosimetry estimates in the murine model usually were based on biodistribution data and standard Medical Internal Radiation Dose approaches. A new dosimetric model for the mouse that takes into consideration the small dimensions, mass, and proximity of murine organs has been developed based on self-organ absorbed and cross-organ doses. Methods. Nude mice bearing carcinoembryonic antigen-expressing WiDr human colon cancer xenografts were injected with 240 mu Ci Y-90-anti-carcinoembryonic-antigen monoclonal antibodies and then killed at 12, 24, 72, 120, and 168 hours. Tumors and major organs were removed, weighed, and counted on a gamma counter. Using the resulting biodistribution data, the radiation doses to tumor and normal organs were calculated using the new dosimetric model for the mouse. Results. Three organs (the liver, kidneys, and large bowel) directly received > 50% of the total absorbed beta dose from radioactivity. Lungs, stomach, and marrow received the highest percentage (70-75%) of the total absorbed dose from adjacent organs. Tumor absorbed dose, estimated with the new dosimetric model, was three times less than that obtained with a MIRD-style calculation without correction for self-absorbed and cross-organ doses. Conclusions. The new dosimetric model, which accounts more accurately for self-organ absorbed and cross-organ beta dose fraction, allows the calculation of tumor and organ doses in the murine model. Accurate estimation of radiation doses to tumor and critical organs, such as the marrow, spleen and kidneys, is important in determining the efficacy and toxicity of radioimmunotherapy regimens in animals and in subsequent human applications. C1 CITY HOPE NATL MED CTR, DIV GEN & ONCOL SURG, DUARTE, CA USA. CITY HOPE NATL MED CTR, DIV RADIOL, DUARTE, CA USA. PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA USA. FU NCI NIH HHS [CA43904, CA09477, CA33572] NR 25 TC 20 Z9 21 U1 1 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD FEB 1 PY 1994 VL 73 IS 3 SU S BP 958 EP 965 DI 10.1002/1097-0142(19940201)73:3+<958::AID-CNCR2820731331>3.0.CO;2-E PG 8 WC Oncology SC Oncology GA MV418 UT WOS:A1994MV41800030 PM 8306285 ER PT J AU STRAND, SE IVANOVIC, M ERLANDSSON, K FRANCESCHI, D BUTTON, T SJOGREN, K WEBER, DA AF STRAND, SE IVANOVIC, M ERLANDSSON, K FRANCESCHI, D BUTTON, T SJOGREN, K WEBER, DA TI SMALL ANIMAL IMAGING WITH PINHOLE SINGLE-PHOTON EMISSION COMPUTED-TOMOGRAPHY SO CANCER LA English DT Article; Proceedings Paper CT 9th Conference on Radioimmunodetection and Radioimmunotherapy of Cancer CY SEP 17-19, 1992 CL PRINCETON, NJ DE SINGLE-PHOTON EMISSION COMPUTED TOMOGRAPHY; SCINTILLATION CAMERA; PINHOLE COLLIMATOR; CONE-BEAM TOMOGRAPHY; PINHOLE SINGLE-PHOTON EMISSION COMPUTED TOMOGRAPHY; HIGH RESOLUTION; RADIONUCLIDES; METHYLENE DIPHOSPHONATE; HEXAMETHYLPROPYLENE AMINE OXIME; MONOCLONAL ANTIBODIES ID BETA-CAMERA AB Background. High resolution spatial details of the distribution of activity in three dimensions is required to evaluate the localization and dosimetric properties of radiolabelled monoclonal antibodies in tumors and normal tissues. Planar imaging of small animals with a resolution of 5-10 mm is usually the imaging modality of choice. The authors investigated high resolution single-photon emission computed tomographic (SPECT) imaging, based on a rotating pinhole scintillation camera. Although the sensitivity of the pinhole collimator is low, several radionuclides offer suitable decay properties to perform pinhole SPECT, especially in conjunction with high activity levels used in radioimmunotherapy. Methods. Transverse, sagittal, and coronal sections were reconstructed using a three-dimensional cone-beam algorithm, which is a generalization of the two-dimensional fan-beam filtered backprojection algorithm. Before reconstruction, the pinhole projections were corrected for the decay of the radionuclide, geometric and intrinsic efficiency variations of the camera system, and center of rotation shift. Results. The spatial resolution at 50 mm from the pinhole collimator with 3.3 mm aperture was 3.4 mm, and the sensitivity 7.2 c/s/mu Ci for technetium-99m. With the 2 mm collimator the resolution was 2.2 mm, and the sensitivity was 2.6 c/s/mu Ci. To show the spatial resolution in vivo, a rat was injected with 185 MBq of technetium-99m-methylene diphosphonate or with 5 mCi technetium-99m-hexamethylpropylene amine oxime. The bone structures were well delineated in the methylene diphosphonate image, and in the hexamethylpropylene amine oxime image, the brain was nicely shown. For comparison a magnetic resonance image for the same section was done. Conclusions. High resolution SPECT imaging with the pinhole collimator provides mapping of the activity in three-dimensions, needed for more detailed biodistribution data and to perform more accurate dosimetry. C1 LUND UNIV,DEPT RADIAT PHYS,LUND,SWEDEN. BROOKHAVEN NATL LAB,DEPT MED,NEW YORK,NY. SUNY STONY BROOK,STONY BROOK,NY 11794. NR 11 TC 60 Z9 60 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD FEB 1 PY 1994 VL 73 IS 3 SU S BP 981 EP 984 DI 10.1002/1097-0142(19940201)73:3+<981::AID-CNCR2820731334>3.0.CO;2-N PG 4 WC Oncology SC Oncology GA MV418 UT WOS:A1994MV41800033 PM 8306288 ER PT J AU STARK, AA RUSSELL, JJ LANGENBACH, R PAGANO, DA ZEIGER, E HUBERMAN, E AF STARK, AA RUSSELL, JJ LANGENBACH, R PAGANO, DA ZEIGER, E HUBERMAN, E TI LOCALIZATION OF OXIDATIVE DAMAGE BY A GLUTATHIONE-GAMMA-GLUTAMYL TRANSPEPTIDASE SYSTEM IN PRENEOPLASTIC LESIONS IN SECTIONS OF LIVERS FROM CARCINOGEN-TREATED RATS SO CARCINOGENESIS LA English DT Article ID ALTERED HEPATOCYTE FOCI; RENAL-CELL CARCINOMA; TRANSFERASE TRANSPEPTIDASE; FERRIC NITRILOTRIACETATE; LIPID-PEROXIDATION; SALMONELLA-TYPHIMURIUM; PEROXISOME PROLIFERATION; NEOPLASTIC LESIONS; OXIDASE ACTIVITY; REACTIVE OXYGEN AB Previous studies from our laboratories have shown that catabolism of glutathione (GSH) by gamma-glutamyl transpeptidase (GGT) in the presence of transition metals leads to oxidative damage (OD). This damage is exemplified in vitro by GGT-dependent GSH mutagenesis which involves reactive oxygen species and by GGT-dependent accumulation of lipid peroxidation (LPO) products in systems containing polyunsaturated fatty acid and GSH. In order to test whether catabolism of GSH by membranal GGT in enzyme-altered preneoplastic hepatic lesions can induce oxidative damage in situ, and to test whether the OD is localized in these lesions, 21 day old Fischer rats were treated with 12 mg/kg diethylnitrosamine (DEN) followed by 0.1% or 0.25% phenobarbital (PB) in the diet. Cryostat sections were examined histochemically for GGT-rich hepatic lesions. Adjacent sections were incubated with GSH and iron and examined for areas staining for lipid peroxidation. Distinct LPO-positive areas were shown to correspond well with the GGT-positive hepatic lesions. Promotion with 0.25% PB led to increasing proportions of LPO-positive lesions with time among GGT-positive lesions. The visualization of LPO in GGT-rich hepatic lesions depended on the presence of GSH and iron, and was not observed following chelation of iron by diethyl triaminopentaacetic acid (DTPA), in the presence of acivicin, an inhibitor of GGT, or in the presence of the radical scavenger butylated hydroxytoluene (BHT). The factors affecting GSH-GGT-dependent LPO in the GGT-rich foci were identical to those affecting GSH-GGT-driven LPO in vitro, and were similar to those affecting oxidative GSH-mutagenesis catalyzed by GGT. The results indicate that metabolism of GSH by GGT in preneoplastic liver foci can initiate an oxidative process leading to a radical-rich environment and to oxidative damage. Such damage may contribute to the processes by which cells within such foci progress to malignancy. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. NIEHS,EXPTL CARCINOGENESIS & MUTAGENESIS BRANCH,RES TRIANGLE PK,NC 27709. RP STARK, AA (reprint author), TEL AVIV UNIV,DEPT BIOCHEM,IL-69978 TEL AVIV,ISRAEL. RI WSU, USTUR/I-1056-2013 NR 49 TC 58 Z9 59 U1 0 U2 3 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0143-3334 J9 CARCINOGENESIS JI Carcinogenesis PD FEB PY 1994 VL 15 IS 2 BP 343 EP 348 DI 10.1093/carcin/15.2.343 PG 6 WC Oncology SC Oncology GA MW782 UT WOS:A1994MW78200033 PM 7906207 ER PT J AU MARUSIC, M BAJZER, Z FREYER, JP VUKPAVLOVIC, S AF MARUSIC, M BAJZER, Z FREYER, JP VUKPAVLOVIC, S TI ANALYSIS OF GROWTH OF MULTICELLULAR TUMOR SPHEROIDS BY MATHEMATICAL-MODELS SO CELL PROLIFERATION LA English DT Article ID HETEROGENEITY; SATURATION; NECROSIS; GLUCOSE; CELLS AB We wished to determine the applicability of previously proposed deterministic mathematical models to description of growth of multicellular tumour spheroids. The models were placed into three general classes: empirical, functional and structural. From these classes, 17 models were applied systematically to growth curves of multicellular tumour spheroids used as paradigms of prevascular and microregional tumour growth. The spheroid growth curves were determined with uniquely high density of measurements and high precision. The theoretical growth curves obtained from the models were fitted by the weighted least-squares method to the 15 measured growth curves, each corresponding to a different cell line. The classical growth models such as von Bertalanffy, logistic and Gompertz were considered as nested within more general models. Our results demonstrate that most models fitted the data fairly well and that criteria other than statistical had to be used for final selection. The Gompertz, the autostimulation and the simple spheroid models were the most appropriate for spheroid growth in the empirical, functional and structural classes of models, respectively. We also showed that some models (e.g. logistic, von Bertalanffy) were clearly inadequate. Thus, contrary to the widely held belief, the sigmoid character of a three or more parameter growth function is not sufficient for adequate fits. C1 MAYO CLIN & MAYO FDN,DIV DEV ONCOL RES,ROCHESTER,MN 55905. MAYO CLIN & MAYO FDN,DEPT BIOCHEM & MOLEC BIOL,ROCHESTER,MN 55905. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM. FU NCI NIH HHS [CA45312, CA51150] NR 43 TC 117 Z9 117 U1 0 U2 16 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0960-7722 J9 CELL PROLIFERAT JI Cell Prolif. PD FEB PY 1994 VL 27 IS 2 BP 73 EP 94 DI 10.1111/j.1365-2184.1994.tb01407.x PG 22 WC Cell Biology SC Cell Biology GA MU356 UT WOS:A1994MU35600002 PM 10465028 ER PT J AU BASILEVSKY, MV CHUDINOV, GE NEWTON, MD AF BASILEVSKY, MV CHUDINOV, GE NEWTON, MD TI THE MULTI-CONFIGURATIONAL ADIABATIC ELECTRON-TRANSFER THEORY AND ITS INVARIANCE UNDER TRANSFORMATIONS OF CHARGE-DENSITY BASIS FUNCTIONS SO CHEMICAL PHYSICS LA English DT Article ID NONEQUILIBRIUM SOLVATION; POLAR-SOLVENT; CONTINUUM; SOLUTE; MODEL; POLARIZATION; FORMULATION; EQUILIBRIUM; FREQUENCY; DYNAMICS AB The continuum multi-configurational dynamical theory of electron transfer (ET) reactions in a chemical solute immersed in a polar solvent is developed. The solute wave function is represented as a CI expansion. The corresponding decomposition of the solute charge density generates a set of dynamical variables, the discrete medium coordinates. A new expression for the free energy surface in terms of these coordinates is derived. The stochastic equations of motion derived earlier are shown to be invariant under unitary transformations of orbitals used to build the CI expansion provided the latter is complete over the corresponding orbital subspace, and also under general linear transformations of the bases employed in expanding the charge density. The interrelation between the present general treatment and the reduced theory applied previously in terms of the two-level ET model is investigated. Finally, the explicit expression for the screening potential of medium electrons is derived in the electronic Born-Oppenheimer approximation (fast (slow) electronic timescale for solvent (solute)). The theory leads to a self-consistent scheme for practical calculations of rate constants for ET reactions involving complex solutes. Illustrative test calculations for two-level ET systems are presented, and the importance of proper boundary conditions for realistic molecular cavities is demonstrated. C1 LY KARPOV PHYS CHEM RES INST, MOSCOW 103064, RUSSIA. RP BASILEVSKY, MV (reprint author), BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. NR 40 TC 55 Z9 55 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 FEB 1 PY 1994 VL 179 IS 3 BP 263 EP 278 DI 10.1016/0301-0104(94)87006-3 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MV915 UT WOS:A1994MV91500002 ER PT J AU MA, NL LI, WK CHONG, DP NG, CY AF MA, NL LI, WK CHONG, DP NG, CY TI COMPARISON OF MOLECULAR-ENERGY PREDICTIONS FOR THE NEUTRAL AND IONIC (C, H-N, O N=0-4) SYSTEM BY AB-INITIO GAUSSIAN-2 AND DENSITY-FUNCTIONAL METHODS SO CHEMICAL PHYSICS LA English DT Article ID RADICAL CATION CH3OH.+; THERMOCHEMISTRY; APPROXIMATION; ABINITIO; 1ST-ROW; GAS AB The ionization energies (IEs), electron affinities (EAs), total atomization energies (Sigma D-0), and bond dissociation energies at 0 K (BDEs) for the neutral and ionic (C, H-n, O, n=0-4) system are calculated at the Gaussian-2 (G2), and two levels of density functional (DF) theories. On comparing the calculated values with known experimental data, both the G2 and DF theories are capable of predicting IEs and EAs quite accurately. However, the G2 theory is far more superior to the DF theories in predicting Sigma D-0 and BDEs. Both G2 and DF theoretical calculations indicate that CO- is unstable with respect to electron detachment by approximately 1.6 eV, contrary to the experimental EA(CO)=1.4 eV based on the endothermic ion-molecule reaction study by Refaey and Franklin [Intern. J. Mass Spectrom. Ion Phys. 20 (1976) 19]. The large deviation (3eV) between experimental and theoretical results suggests that the experimental EA(CO) should be re-examined. C1 UNIV BRITISH COLUMBIA,DEPT CHEM,VANCOUVER V6T 1Z1,BC,CANADA. IOWA STATE UNIV,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. RP MA, NL (reprint author), CHINESE UNIV HONG KONG,DEPT CHEM,SHA TIN,HONG KONG. NR 42 TC 14 Z9 14 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 FEB 1 PY 1994 VL 179 IS 3 BP 365 EP 375 DI 10.1016/0301-0104(94)87013-6 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MV915 UT WOS:A1994MV91500009 ER PT J AU GEBERT, MS PEKALA, RW AF GEBERT, MS PEKALA, RW TI FLUORESCENCE AND LIGHT-SCATTERING-STUDIES OF SOL-GEL REACTIONS SO CHEMISTRY OF MATERIALS LA English DT Article ID PHASE-TRANSITION; ORGANIC AEROGELS; SIMPLE SILICATES; FORMALDEHYDE; POLYMERIZATION; RESORCINOL; GLASSES; PROBES AB A fluorescence probe sensitive to local viscosity and local free volume has been used to study the curing behavior of several gel systems used to make aerogels. For the same systems, complementary information regarding the molecular structure (molecular weight, molecular radius, and second virial coefficient) of the sols and solutions has been determined from static light-scattering measurements. These studies reveal clear differences in both the curing behavior and molecular structure of ''polymeric'' and ''colloidal'' systems and show the importance of thermodynamic solvent quality, a parameter traditionally ignored in sol-gel processing. RP GEBERT, MS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 33 TC 7 Z9 7 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD FEB PY 1994 VL 6 IS 2 BP 220 EP 226 DI 10.1021/cm00038a021 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MX649 UT WOS:A1994MX64900021 ER PT J AU SCHRIESHEIM, A AF SCHRIESHEIM, A TI THE CHANGING-ROLE OF THE NATIONAL LABORATORIES - MAN BITES DOG SO CHEMTECH LA English DT Note RP SCHRIESHEIM, A (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2703 J9 CHEMTECH JI Chemtech PD FEB PY 1994 VL 24 IS 2 BP 33 EP 34 PG 2 WC Chemistry, Applied SC Chemistry GA MY673 UT WOS:A1994MY67300009 ER PT J AU ROTTER, JI BU, X CANTOR, R WARDEN, CH XIA, YR DEMEESTER, C TERYUA, S DANESHMAND, S BROWN, J GRAY, RJ BLANCHE, PJ KRAUSS, R LUSIS, AJ AF ROTTER, JI BU, X CANTOR, R WARDEN, CH XIA, YR DEMEESTER, C TERYUA, S DANESHMAND, S BROWN, J GRAY, RJ BLANCHE, PJ KRAUSS, R LUSIS, AJ TI MULTILOCUS GENETIC DETERMINATION OF LDL PARTICLE-SIZE IN CORONARY-ARTERY DISEASE FAMILIES SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 CEDARS SINAI MED CTR, LOS ANGELES, CA 90048 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA USA. UCB, LAWRENCE BERKELEY LAB, BERKELEY, CA USA. NR 0 TC 7 Z9 7 U1 0 U2 1 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD FEB PY 1994 VL 42 IS 1 BP A16 EP A16 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA MR214 UT WOS:A1994MR21400083 ER PT J AU OLSEN, GJ MATSUDA, H HAGSTROM, R OVERBEEK, R AF OLSEN, GJ MATSUDA, H HAGSTROM, R OVERBEEK, R TI FASTDNAML - A TOOL FOR CONSTRUCTION OF PHYLOGENETIC TREES OF DNA-SEQUENCES USING MAXIMUM-LIKELIHOOD SO COMPUTER APPLICATIONS IN THE BIOSCIENCES LA English DT Article ID EVOLUTIONARY TREES AB We have developed a new tool, called fastDNAml, for constructing phylogenetic trees from DNA sequences. The program can be run on a wide variety of computers ranging from Unix workstations to massively parallel systems, and is available from the Ribosomal Database Project (RDP) by anonymous FTP. Our program uses a maximum likelihood approach and is based on version 3.3 of Felsenstein's dnaml program. Several enhancements, including algorithmic changes, significantly improve performance and reduce memory usage, making it feasible to construct even very large trees. Trees containing 40-100 taxa have been easily generated, and phylogenetic estimates are possible even when hundreds of sequences exist. We are currently using the tool to construct a phylogenetic tree based on 473 small subunit rRNA sequences from prokaryotes. C1 ARGONNE NATL LAB, DIV MATH & COMP SCI, ARGONNE, IL 60439 USA. RP OLSEN, GJ (reprint author), UNIV ILLINOIS, DEPT MICROBIOL, URBANA, IL 61801 USA. NR 19 TC 927 Z9 932 U1 0 U2 12 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 FEB PY 1994 VL 10 IS 1 BP 41 EP 48 PG 8 WC Computer Science, Interdisciplinary Applications SC Computer Science GA MY747 UT WOS:A1994MY74700008 PM 8193955 ER PT J AU BOTTONI, M AF BOTTONI, M TI A VARIANT OF THE ADI METHOD FOR 2-PHASE FLOW CALCULATIONS SO COMPUTERS & FLUIDS LA English DT Article AB Several computer codes describing thermo-fluid-dynamic problems in two-phase flow regimes and in three-dimensional geometry solve Poisson equations for the pressure and enthalpy distributions. Numerically exact solution algorithms, based on matrix factorization or Gaussian elimination, which are expensive both in terms of core storage and computing time, can be replaced for large problems by the alternating direction implicit (ADI) method. The performance of advanced vectorizable variants of the ADI method is assessed against the classical Peaceman-Rachford scheme in the case of a two-dimensional model problem. The algorithm is then modified for applications to two-phase flow problems, taking into account the compressibility of the two phases. Three-dimensional applications, both for single- and two-phase flow, prove the applicability of the new variant of the ADI method as an alternative to the more expensive direct numerical methods. RP BOTTONI, M (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 21 TC 1 Z9 2 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7930 J9 COMPUT FLUIDS JI Comput. Fluids PD FEB PY 1994 VL 23 IS 2 BP 305 EP 321 DI 10.1016/0045-7930(94)90043-4 PG 17 WC Computer Science, Interdisciplinary Applications; Mechanics SC Computer Science; Mechanics GA MJ410 UT WOS:A1994MJ41000005 ER PT J AU RIDER, WJ AF RIDER, WJ TI A REVIEW OF APPROXIMATE RIEMANN SOLVERS WITH GODUNOV METHOD IN LAGRANGIAN COORDINATES SO COMPUTERS & FLUIDS LA English DT Article ID HYPERBOLIC CONSERVATION-LAWS; FINITE-DIFFERENCE METHODS; SHOCK-CAPTURING SCHEMES; EFFICIENT IMPLEMENTATION; FLOW; EQUATIONS; DYNAMICS; SYSTEMS AB This paper constructs several approximate Riemann solvers for use in solving the fluid flow equations in Lagrangian coordinates (the overall solution procedure used here is Eulerian with a Lagrangian step followed by a remap to the original coordinates). Results obtained with these solvers are compared with exact or converged numerical solutions to define their characteristics. The Riemann solvers developed here are useful in flow solution algorithms involving a Lagrangian-Eulerian or purely Lagrangian formulation. RP LOS ALAMOS NATL LAB, MAIL STOP B265, LOS ALAMOS, NM 87545 USA. NR 37 TC 10 Z9 10 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0045-7930 EI 1879-0747 J9 COMPUT FLUIDS JI Comput. Fluids PD FEB PY 1994 VL 23 IS 2 BP 397 EP 413 DI 10.1016/0045-7930(94)90047-7 PG 17 WC Computer Science, Interdisciplinary Applications; Mechanics SC Computer Science; Mechanics GA MJ410 UT WOS:A1994MJ41000009 ER PT J AU DUKOWICZ, JK AF DUKOWICZ, JK TI COMPUTATIONAL-EFFICIENCY OF THE HYBRID PENALTY-PSEUDOCOMPRESSIBILITY METHOD FOR INCOMPRESSIBLE-FLOW SO COMPUTERS & FLUIDS LA English DT Note ID CONJUGATE AB Ramshaw and Mesina have combined the penalty (P) and the pseudocompressibility (PC) methods for the solution of transient incompressible flow problems and have shown that the combined or hybrid method is much superior to either the P or PC method alone. The question remains, however, whether this new method is an improvement over standard (implicit) methods. The two are difficult to compare fairly because, for instance, there appears to be no way to control the error a priori with the hybrid method. For this purpose therefore, we have introduced a method of solving the hybrid method to within a specified error, and also a method of subcycling the rapidly-varying terms. This makes the hybrid method directly comparable to standard implicit methods of solving the incompressible flow equations. We find that the hybrid method is still inferior with regard to computational work to methods based on conjugate gradients, and this conclusion appears to hold independently of mesh resolution. RP DUKOWICZ, JK (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,GRP T3 B216,LOS ALAMOS,NM 87545, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7930 J9 COMPUT FLUIDS JI Comput. Fluids PD FEB PY 1994 VL 23 IS 2 BP 479 EP 486 DI 10.1016/0045-7930(94)90051-5 PG 8 WC Computer Science, Interdisciplinary Applications; Mechanics SC Computer Science; Mechanics GA MJ410 UT WOS:A1994MJ41000013 ER PT J AU PLASKACZ, EJ RAMIREZ, MR GUPTA, S AF PLASKACZ, EJ RAMIREZ, MR GUPTA, S TI NONLINEAR EXPLICIT TRANSIENT FINITE-ELEMENT ANALYSIS ON THE INTEL DELTA SO COMPUTING SYSTEMS IN ENGINEERING LA English DT Article AB Many large-scale finite element problems are intractable on current generation production supercomputers. High-performance computer architectures offer effective avenues to bridge the gap between computational needs and the power of computational hardware. The biggest challenge lies in the substitution of the key algorithms in an application program with redesigned algorithms which exploit the new architectures and use better or more appropriate numerical techniques. A methodology for implementing non-linear finite element analysis on a homogeneous distributed processing network is discussed. The method can also be extended to heterogeneous networks comprised of different machine architectures provided that they have a mutual communication interface. This unique feature has greatly facilitated the port of the code to the 8-node Intel Touchstone Gamma and then the 512-node Intel Touchstone Delta. The domain is decomposed serially in a preprocessor. Separate input files are written for each subdomain. These files are read in by local copies of the program executable operating in parallel. Communication between processors is addressed utilizing asynchronous and synchronous message passing. The basic kernel of message passing is the internal force exchange which is analogous to the computed interactions between sections of physical bodies in static stress analysis. Benchmarks for the Intel Delta arc presented. Performance exceeding 1 gigaflop was attained. Results for two large-scale finite element meshes are presented. C1 JOHNS HOPKINS UNIV,DEPT CIVIL ENGN,BALTIMORE,MD 21218. RP PLASKACZ, EJ (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 20 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 0956-0521 J9 COMPUT SYST ENG JI Comput. Syst. Eng. PD FEB PY 1994 VL 5 IS 1 BP 1 EP 17 DI 10.1016/0956-0521(94)90033-7 PG 17 WC Computer Science, Interdisciplinary Applications; Engineering, Multidisciplinary SC Computer Science; Engineering GA PD376 UT WOS:A1994PD37600001 ER PT J AU PLUMMER, MV CONGDON, JD AF PLUMMER, MV CONGDON, JD TI RADIOTELEMETRIC STUDY OF ACTIVITY AND MOVEMENTS OF RACERS (COLUBER CONSTRICTOR) ASSOCIATED WITH A CAROLINA BAY IN SOUTH-CAROLINA SO COPEIA LA English DT Article ID CROTALUS-HORRIDUS; HABITAT USE; SNAKE; POPULATIONS; SIZE AB Racers (Coluber constrictor) were monitored with radiotelemetry in an old field/forest habitat surrounding a Carolina bay in South Carolina. Racers were active on approximately 70% of days; inactive snakes usually were in ecdysis. Active racers were relocated on the ground surface (40%), above ground in shrubs and trees (35%), and underground (25%). Habitats in which racers were relocated were thickets and grassland shrubs (50%), woodland/forest (25%), and grassland (25%). Active snakes moved an average of 104 m/d within home ranges averaging 12.2 ha estimated as minimum convex polygons. The home range of each snake included at least a portion of the bay and overlapped with home ranges of other snakes. In comparison with other studies of racers in which data were collected, analyzed, and presented in the same manner as in this study, home range size and daily movement of South Carolina racers were significantly greater. Possible explanations for the greater movement include trophic level differences and a proximate response to a local drought. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 41 TC 40 Z9 41 U1 1 U2 6 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS BUSINESS OFFICE PI CARBONDALE PA SOUTHERN ILLINOIS UNIV, DEPT ZOOLOGY, CARBONDALE, IL 62901-6501 SN 0045-8511 J9 COPEIA JI Copeia PD FEB 1 PY 1994 IS 1 BP 20 EP 26 DI 10.2307/1446666 PG 7 WC Zoology SC Zoology GA MV931 UT WOS:A1994MV93100003 ER PT J AU BUCHHEIT, RG MORAN, JP STONER, GE AF BUCHHEIT, RG MORAN, JP STONER, GE TI ELECTROCHEMICAL-BEHAVIOR OF THE T-1 (AL2CULI) INTERMETALLIC COMPOUND AND ITS ROLE IN LOCALIZED CORROSION OF AL-2-PERCENT-LI-3-PERCENT-CU ALLOYS SO CORROSION LA English DT Article DE AA 2090 ALLOY; ALUMINUM ALLOYS; ARTIFICIAL AGING; CHLORIDE; COPPER; DIRECT CURRENT; GRAIN BOUNDARIES; INTERMETALLIC COMPOUNDS; LITHIUM; LOCALIZED CORROSION; MICROSTRUCTURE; PITTING; PRECIPITATES; SULFATE ID AL-LI; ZR ALLOY AB The T-1(AI(2)CuLi) intermetallic compound was synthesized in bulk form for characterization of its electrochemical behavior in chloride solutions by conventional direct current (DC) techniques. Results indicated T-1 was active with respect to its microstructural suroundings in artificially aged Aluminum Association (AA) 2090 (UNS A92090) (Al 2.1% Li-2.6% Cu) and preferential dissolution of T-1 precipitates strongly influenced localized corrosion behavior of the alloy. Subgrain boundaries in artificially aged AA 2090 were particularly susceptible to localized attack because of high concentrations of T-1. The role of T-1 in preferential subgrain boundary attack in a chloride-free sulfate solution also was investigated. C1 ALCOA,ALCOA CTR,PA 15069. UNIV VIRGINIA,DEPT MAT SCI & ENGN,CHARLOTTESVILLE,VA 22901. RP BUCHHEIT, RG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 49 TC 62 Z9 76 U1 0 U2 11 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD FEB PY 1994 VL 50 IS 2 BP 120 EP 130 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MW794 UT WOS:A1994MW79400005 ER PT J AU CHA, YS NIEMANN, RC HULL, JR AF CHA, YS NIEMANN, RC HULL, JR TI DYNAMICS OF LIQUID-HELIUM BOIL-OFF EXPERIMENTS WITH A STEP CHANGE IN PRESSURE SO CRYOGENICS LA English DT Article DE CALORIMETERS; HELIUM BOIL-OFF; THERMODYNAMICS AB The results of dynamic analysis of the effect of pressure variations during helium boil-off experiments are presented. A general solution of the diffusion equation with a time-dependent boundary condition is employed to describe the dynamic response of the liquid helium system under variable pressure conditions, and a solution is obtained for the special case when the system is subjected to a step change in pressure. The calculated temperature response of the liquid indicates that most of the experiments were not likely to have reached equilibrium as a result of the low thermal diffusivity of liquid helium. The initial rate of evaporation or condensation is large, and the rate decreases sharply with time. A method is proposed to account for the transient effect that is observed during calculation of the heat loss rate from a helium boil-off experiment. By assuming that there is no mixing at all, the present analysis provides an estimate of the upper (condensation) or lower (evaporation) bound of the heat loss rate as a result of a pressure increase or decrease in the system. A previously reported equilibrium analysis is expected to apply to situations where complete mixing occurred in the bulk liquid and provides the opposite limits. RP CHA, YS (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD FEB PY 1994 VL 34 IS 2 BP 99 EP 103 DI 10.1016/0011-2275(94)90031-0 PG 5 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA MT358 UT WOS:A1994MT35800001 ER PT J AU DRESNER, L AF DRESNER, L TI ON THE CONNECTION BETWEEN NORMAL ZONE VOLTAGE AND HOT-SPOT TEMPERATURE IN UNCOOLED MAGNETS SO CRYOGENICS LA English DT Article DE NORMAL ZONE VOLTAGE; NORMAL ZONE PROPAGATION VELOCITY; HOT SPOT; TEMPERATURE AB The propagation of normal zones in uncooled magnets has been studied. Special cases have been identified in which closed formulae for the propagation velocity can be obtained. An approximate formula is proposed for the more general case in which the matrix resistivity and the thermal conductivity obey the Wiedemann-Franz law and the specific heat depends arbitrarily on the temperature. With this formula, the connection between the normal zone voltage and the hot spot temperature can be worked out. In an example studied in detail (Ag/BSCCO conductor at 20K), the voltage appears adequate to allow detection of the normal zone before the conductor overheats. RP DRESNER, L (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD FEB PY 1994 VL 34 IS 2 BP 111 EP 118 DI 10.1016/0011-2275(94)90033-7 PG 8 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA MT358 UT WOS:A1994MT35800003 ER PT J AU RAMAKRISHNAN, V AF RAMAKRISHNAN, V TI HISTONE STRUCTURE SO CURRENT OPINION IN STRUCTURAL BIOLOGY LA English DT Article ID NUCLEOSOME CORE PARTICLE; LINKING NUMBER CHANGE; SEA-URCHIN SPERM; COOPERATIVE BINDING; GLOBULAR DOMAIN; ALPHA-HELIX; CHROMATIN; DNA; ACETYLATION; RESOLUTION AB A revised crystal structure of the histone octamer is compatible with earlier studies on both the octamer and the nucleosome core particle. The crystal structure of GH5, the globular domain of histone H5 is strikingly similar to that of the transcription factor HNF-3 gamma, and to certain other DNA-binding domains that contain a helix-turn-helix motif. Both these structures can be used as a starting point to understand the interaction of histones With DNA in the nucleosome. RP RAMAKRISHNAN, V (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. OI Ramakrishnan, V/0000-0002-4699-2194 NR 46 TC 27 Z9 27 U1 0 U2 1 PU CURRENT BIOLOGY LTD PI LONDON PA 34-42 CLEVELAND STREET, LONDON, ENGLAND W1P 6LB SN 0959-440X J9 CURR OPIN STRUC BIOL JI Curr. Opin. Struct. Biol. PD FEB PY 1994 VL 4 IS 1 BP 44 EP 50 DI 10.1016/S0959-440X(94)90058-2 PG 7 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA NF779 UT WOS:A1994NF77900007 ER PT J AU HIRONS, GT FAWCETT, JJ CRISSMAN, HA AF HIRONS, GT FAWCETT, JJ CRISSMAN, HA TI TOTO AND YOYO - NEW VERY BRIGHT FLUOROCHROMES FOR DNA CONTENT ANALYSES BY FLOW-CYTOMETRY SO CYTOMETRY LA English DT Article DE TOTO AND YOYO; DNA INTERCALATING FLUOROCHROMES; FLOW CYTOMETRY; CHROMOSOME STAINING ID ETHIDIUM HOMODIMER; FLUORESCENCE; CHROMOSOMES; CELLS AB Flow cytometric (FCM) studies were performed on nuclei, ethanol-fixed CHO cells, and isolated human GM130 chromosomes stained with two new cyanine dyes, TOTO and YOYO. These fluorochromes, which are dimers of thiazole orange and oxazole yellow, respectively, have high quantum efficiencies and exhibit specificities for both DNA and RNA. Bound to dsDNA in solution, TOTO and YOYO emit at 530 and 510 nm, respectively, when excited at 488 nm and 457 nm, wavelengths available from most lasers employed in FCM. RNase-treated CHO nuclei, stained with either TOTO or YOYO, provided DNA histograms, with low coefficients of variation, that were as good as or better than those obtained with nuclei stained with propidium iodide (PI) or mithramycin (MI). In addition, by comparison on an equimolar basis, nuclei stained with YOYO fluoresced over 1,000 times more intensely than nuclei stained with MI. Fluorescence ratio analyses of nuclei stained with both YOYO and Hoechst 33258 showed that the ratio of YOYO to Hoechst fluorescence remained relatively constant for G(1) and S phase cells, but decreased significantly for cells in G(2)/M. These results indicate that the cyanine dyes may be useful in examining specific changes in chromatin structure during G(2)/M phases of the cell cycle. Ethanol-fixed CHO cells stained with TOTO or YOYO did not yield reproducible DNA histograms of good quality, presumably because of the poor accessibility of DNA to these large fluorochromes. However, bivariate analyses of human GM130 chromosomes stained with TOTO or YOYO alone and excited sequentially with uv and visible wavelengths showed resolution of many individual chromosome peaks similar to results obtained for chromosomes stained with HO and chromomycin A(3). Collectively, these studies show potential advantages for the use of these new cyanine dyes in FCM studies that require the sensitive detection of DNA. (C) 1994 Wiley-liss, Inc. RP HIRONS, GT (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. FU NCRR NIH HHS [P41-RR01315, R24 RR06758] NR 20 TC 116 Z9 116 U1 2 U2 13 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0196-4763 J9 CYTOMETRY JI Cytometry PD FEB 1 PY 1994 VL 15 IS 2 BP 129 EP 140 DI 10.1002/cyto.990150206 PG 12 WC Biochemical Research Methods; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MU351 UT WOS:A1994MU35100004 PM 7513274 ER PT J AU FAY, SP HABBERSETT, R DOMALEWSKI, MD POSNER, RG HOUGHTON, TG PIERSON, E MUTHUKUMARASWAMY, N WHITAKER, J HAUGLAND, RP FREER, RJ SKLAR, LA AF FAY, SP HABBERSETT, R DOMALEWSKI, MD POSNER, RG HOUGHTON, TG PIERSON, E MUTHUKUMARASWAMY, N WHITAKER, J HAUGLAND, RP FREER, RJ SKLAR, LA TI MULTIPARAMETER FLOW CYTOMETRIC ANALYSIS OF A PH SENSITIVE FORMYL PEPTIDE WITH APPLICATION TO RECEPTOR STRUCTURE AND PROCESSING KINETICS SO CYTOMETRY LA English DT Article DE MULTIPARAMETER FLOW CYTOMETRY; LIGAND-RECEPTOR INTERACTION; PH SENSITIVITY; FORMYL PEPTIDE RECEPTOR ID G-PROTEIN; HUMAN-NEUTROPHILS; LIGAND; FLUORESCEIN; DYNAMICS; BINDING AB Environmentally sensitive molecules have many potential cellular applications. We have investigated the utility of a pH sensitive ligand for the formyl peptide receptor, CHO-Met-Leu-Phe-Phe-Lys (SNAFL)-OH (SNAFL-seminaphthonuorescein), because in previous studies (Fay et al.: Biochemistry 30:5066-5075, 1991) protonation has been used to explain the quenching when the fluoresceinated formyl pentapeptide ligand binds to this receptor. Moreover, acidification in intracellular compartments is a general mechanism occurring in cells during processing of ligand-receptor complexes. Because the protonated form of SNAFL is excited at 488 nm with emission at 530 nm and the unprotonated form is excited at 568 nm with emission at 650 nm, the ratio of protonated and unprotonated forms can be examined by multiparameter flow cytometry. We found that the receptor-bound Ligand is sensitive to both the extracellular and intracellular pH. There is a small increase in the pK(a) of the ligand upon binding to the receptor consistent with protonation in the binding pocket. Once internalized, spectral changes in the probe consistent with acidification and ligand dissociation from the receptor are observed. (C) 1994 Wiley-Liss, Inc. C1 LOS ALAMOS NATL LAB, NATL FLOW CYTOMETRY RESOURCES, LOS ALAMOS, NM 87545 USA. UNIV NEW MEXICO, SCH MED, DEPT CYTOMETRY, ALBUQUERQUE, NM 87131 USA. VIRGINIA COMMONWEALTH UNIV MED COLL VIRGINIA, RICHMOND, VA 23298 USA. MOLEC PROBES INC, EUGENE, OR 97402 USA. OI Gilbert, Terri/0000-0002-4986-6898 FU NCRR NIH HHS [RR01315]; NIAID NIH HHS [AI19032, AI-25832] NR 21 TC 1 Z9 1 U1 1 U2 3 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0196-4763 J9 CYTOMETRY JI Cytometry PD FEB 1 PY 1994 VL 15 IS 2 BP 148 EP 153 DI 10.1002/cyto.990150208 PG 6 WC Biochemical Research Methods; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MU351 UT WOS:A1994MU35100006 PM 8168401 ER PT J AU KIRKMAN, LK SHARITZ, RR AF KIRKMAN, LK SHARITZ, RR TI VEGETATION DISTURBANCE AND MAINTENANCE OF DIVERSITY IN INTERMITTENTLY FLOODED CAROLINA BAYS IN SOUTH-CAROLINA SO ECOLOGICAL APPLICATIONS LA English DT Article DE BIODIVERSITY; CAROLINA BAYS; DISTURBANCE; RARE PLANTS; SEASONAL WETLANDS; SEED BANK; VEGETATION DYNAMICS; WETLAND MANAGEMENT ID PRAIRIE GLACIAL MARSHES; SEED BANKS; PATTERNS; WETLAND; RECRUITMENT; PERSISTENCE; SUCCESSION; DYNAMICS; ONTARIO; HISTORY AB We manipulated the fire regime and soil disturbance in four grass-dominated Carolina bay wetlands during a prolonged drought period and examined vegetation composition and cover within dominant vegetation types prior to and after treatments. We used the seedling emergence technique to determine the role of the seed bank in the recovery process. Burning did not affect richness, evenness, or diversity (all vegetation types combined); however, soil tillage increased diversity, including both evenness and richness. Percent similarity of the vegetation before and after disturbance was greater in the burning treatment than in the tillage treatment, probably due to greater disruption of the rhizomes of the perennial vegetation by tillage. Vegetation types varied in degree of recovery, although dominance was not altered by either treatment. Several native fugitive species increased following disturbance, indicating that species coexistence in these Carolina bay wetlands depends on the life history characteristics of residual vegetation, as well as that of seed bank species. The seed bank (72 600 seedlings/m(2)) was larger and species richness (108 species) was greater than reported for most other freshwater wetlands. No differences in species richness, evenness, or diversity were detectable among the seed banks associated with different vegetation types in the bays. The floristic composition of the seed bank did not resemble the standing vegetation in patches dominated by large perennial grasses (Panicum hemitomon, Leersia hexandra, and Andropogon virginicus). In contrast, seed bank samples associated with vegetation dominated by an annual forb (Iva microcephala) or the small perennial grasses Panicum wrightianum or P. acuminatum var. unciphyllum more closely reflected the standing vegetation. Species appear to persist with recurring and multiple disturbances because of seed banks, rhizomes, morphological plasticity during inundation, sexual reproduction following inundation, and perenniality coupled with early sexual maturity. Conservation management of intermittently inundated wetlands should incorporate techniques to foster maintenance of endemic species richness and the recruitment of rare species. During periods of drought, it may be desirable to disturb the aggressive perennial vegetation to allow recruitment of less common species. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602. UNIV GEORGIA,INST ECOL,ATHENS,GA 30602. NR 58 TC 83 Z9 85 U1 2 U2 22 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD FEB PY 1994 VL 4 IS 1 BP 177 EP 188 DI 10.2307/1942127 PG 12 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA MU605 UT WOS:A1994MU60500019 ER PT J AU RUDGE, A RAISTRICK, I GOTTESFELD, S FERRARIS, JP AF RUDGE, A RAISTRICK, I GOTTESFELD, S FERRARIS, JP TI A STUDY OF THE ELECTROCHEMICAL PROPERTIES OF CONDUCTING POLYMERS FOR APPLICATION IN ELECTROCHEMICAL CAPACITORS SO ELECTROCHIMICA ACTA LA English DT Article DE ULTRACAPACITORS; SUPERCAPACITORS; N-DOPED POLYMERS; CONDUCTING POLYMERS; ELECTRIC VEHICLES; REGENERATIVE BRAKING ID POLYACETYLENE ELECTRODES; POLYPYRROLE FILMS; POLYANILINE FILMS; IMPEDANCE SPECTROSCOPY; RECHARGEABLE BATTERY; BEHAVIOR; (CH)X; POLYTHIOPHENE; OXIDATION; KINETICS AB Conducting polymers can be doped and dedoped rapidly to high charge density and as a result are potential active materials for use in electrochemical capacitors. We discuss three schemes by which conducting polymers can be utilized in electrochemical capacitors and in the third of these, which employs a conducting polymer that can be both n- and p-doped, high energy and power densities are demonstrated. Polythiophenes can be both n- and p-doped reversibly and we have tested a number of poly-3-arylthiophenes in order to achieve the best n-doping at thick polymer films. We have found that poly-3-(4-fluorophenyl)-thiophene, in a solution of 1moldm(-3) tetramethylammonium trifluoromethanesulfonate in acetonitrile, can be n- and p-doped, both reversibly and to high charge density. Such key properties for high power, energy storage devices have not been demonstrated before with conducting polymer active materials. We propose that the improvement in polymer n-dopability that results from derivitization of thiophene with aryl substituents in the 3-position, is probably achieved thanks to electron transfer from the negatively charged polythiophene backbone to the aryl substituent. This proposal is discussed in the light of modeling information and of voltammetric data. Further supporting information is provided by electron microscopy, impedance spectroscopy and electrochemical quartz crystal microbalance results. C1 UNIV TEXAS,DEPT CHEM,RICHARDSON,TX 75080. RP RUDGE, A (reprint author), LOS ALAMOS NATL LAB,ELECTR RES GRP,LOS ALAMOS,NM 87545, USA. NR 99 TC 315 Z9 319 U1 13 U2 123 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD FEB PY 1994 VL 39 IS 2 BP 273 EP 287 DI 10.1016/0013-4686(94)80063-4 PG 15 WC Electrochemistry SC Electrochemistry GA MP692 UT WOS:A1994MP69200013 ER PT J AU MINEHART, DL MEIER, AK AF MINEHART, DL MEIER, AK TI USING SYNTHETIC DATA TO EXPLORE THE USEFULNESS OF PRISMS PARAMETERS AT INFERRING CAUSES OF CHANGES IN NORMALIZED ANNUAL CONSUMPTION SO ENERGY LA English DT Article AB PRISM's linear regression of energy per day vs heating degree days (HDD) per day is widely used for the weather normalization of energy use in buildings. While Normalized Annual Consumption (NAC) is PRISM's most robust result, changes in the regression parameters intercept, slope, and reference temperature are often cited to infer the physical changes in the buildings under consideration. Using DOE-2 simulations of energy use, we show that such use of parameters other than NAC is inadvisable in a mild climate, due to significant nonlinearity in the relation between energy use and heating degree days. PRISM's unique feature is its adjustment of the reference temperature for HDD calculations to maximize the linearity of energy/day vs HDD/day, so that each house or group of houses under examination has its own reference temperature. This method of reference temperature adjustment, in a mild climate such as San Francisco's, results in significant misstatement of the actual reference temperature, base-level consumption, and heat part parameters. The distortions are not consistently biased. Further, the standard errors of the parameter estimates sometimes provide insufficient warning of the problems attendant on the use of changes in these parameters to explain physical changes in the building. C1 LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720. RP MINEHART, DL (reprint author), UNIV CALIF BERKELEY,ENERGY & RESOURCES GRP,BLDG 74,ROOM 100,BERKELEY,CA 94720, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 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 FEB PY 1994 VL 19 IS 2 BP 135 EP 148 DI 10.1016/0360-5442(94)90055-8 PG 14 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA MY428 UT WOS:A1994MY42800001 ER PT J AU VINE, EL AF VINE, EL TI THE HUMAN DIMENSION OF PROGRAM-EVALUATION SO ENERGY LA English DT Article ID ENERGY AB This paper provides an overview of the human dimension of program evaluation and focuses on key evaluation issues in demand-side management which will require the use of social science research for addressing these issues. As new techniques are developed and perfected, as the results of impact evaluations become more abundant, and as the gap between technical energy savings potential and realized savings becomes more visible, research regarding the human dimension of program evaluation will be crucial. RP VINE, EL (reprint author), LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 39 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD FEB PY 1994 VL 19 IS 2 BP 165 EP 178 DI 10.1016/0360-5442(94)90057-4 PG 14 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA MY428 UT WOS:A1994MY42800003 ER PT J AU CHEN, DT CHATURVEDI, SK MOHIELDIN, TO AF CHEN, DT CHATURVEDI, SK MOHIELDIN, TO TI AN APPROXIMATE METHOD FOR CALCULATING LAMINAR NATURAL CONVECTIVE MOTION IN A TROMBE-WALL CHANNEL SO ENERGY LA English DT Article ID HEATED VERTICAL PLATES; FLOW; CONDUCTION AB Laminar natural convective motion in a channel formed by differentially heated vertical plates is analyzed. The proposed model combines the momentum-integral equation with the Oseen approximation for convective terms in the energy equation to predict the volumetric flow rate as a function of channel height. A second-order ordinary differential equation for pressure defect in the channel is derived by approximating the axial velocity profile with a fourth-order polynomial. Results obtained from the present model are in good agreement with previously reported results. Consideration of a second-order axial velocity profile in the momentum-integral model leads to closed form solutions that are in good agreement with previously reported results only in the mid to high flowrate regime. In the low flow-rate regime, the second-order model gives results that deviate significantly from results obtained for other models. Neglect of inertia terms in the momentum-integral model leads to a first-order differential equation for the pressure and a closed form solution of the problem. However, this approximation yields results that are good only in the mid to high flowrate regime, while showing deviations from other models in the low flowrate regime. Finally, the present model is also shown to be capable of application to fluids with widely ranging Prandtl numbers. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. OLD DOMINION UNIV,DEPT ENGN TECHNOL,NORFOLK,VA 23529. NR 19 TC 13 Z9 14 U1 0 U2 1 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 FEB PY 1994 VL 19 IS 2 BP 259 EP 268 DI 10.1016/0360-5442(94)90065-5 PG 10 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA MY428 UT WOS:A1994MY42800011 ER PT J AU GADGIL, AJ SASTRY, MA AF GADGIL, AJ SASTRY, MA TI STALLED ON THE ROAD TO THE MARKET - LESSONS FROM A PROJECT PROMOTING LIGHTING EFFICIENCY IN INDIA SO ENERGY POLICY LA English DT Article DE LIGHTING EFFICIENCY; INSTITUTIONAL BARRIERS; DEVELOPING COUNTRIES ID ENERGY EFFICIENCY AB Despite the apparent benefits of energy efficiency as an answer to problems in both environment and development arenas, the diffusion of highly efficient appliances in the developing countries has been limited. This paper describes a field experiment in Bombay designed to overcome barriers to increased energy efficiency through a programme in which high efficiency lamps were to be leased to households where their use would reduce peak evening demand. An examination of the practical progress of the project suggests several issues that proved critical to its success and are likely to be relevant in other attempts to improve energy efficiency in developing countries. C1 MIT,ALFRED P SLOAN SCH MANAGEMENT,CAMBRIDGE,MA 02139. RP GADGIL, AJ (reprint author), LAWRENCE BERKELEY LAB,CTR BLDG SCI,90-3058,BERKELEY,CA 94720, USA. OI Gadgil, Ashok/0000-0002-0357-9455 NR 20 TC 5 Z9 5 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD FEB PY 1994 VL 22 IS 2 BP 151 EP 162 DI 10.1016/0301-4215(94)90132-5 PG 12 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA NE654 UT WOS:A1994NE65400008 ER PT J AU SATHAYE, J FRIEDMANN, R MEYERS, S DEBUEN, O GADGIL, A VARGAS, E SAUCEDO, R AF SATHAYE, J FRIEDMANN, R MEYERS, S DEBUEN, O GADGIL, A VARGAS, E SAUCEDO, R TI ECONOMIC-ANALYSIS OF ILUMEX - A PROJECT TO PROMOTE ENERGY-EFFICIENT RESIDENTIAL LIGHTING IN MEXICO SO ENERGY POLICY LA English DT Article DE LIGHTING; EFFICIENCY; MEXICO AB A higher penetration of compact fluorescent lamps (CFLs) for household lighting can reduce growth in peak electricity demand, reduce sales of subsidized electricity, and lessen environmental impacts. This paper describes an economic analysis of a project designed to promote high penetration rates of CFLs in two cities in Mexico. Our analysis indicates that the project will bring substantial net economic benefits to Mexico, the utility, and the average customer. In the absence of any subsidy to CFLs, most customers will see a payback period longer than two years. By sharing some of the anticipated net benefit, CFE, the utility company, can reduce the payback period to a maximum of two years for all customers. CFE's role is thus crucial to the successful implementation of the project. Expanding the Ilumex project to a Mexico-wide programme would make a significant contribution towards meeting the planned addition of generation capacity by the year 2000. C1 FED ELECTRICIDAD,SUBGERENCIA EVALUAC,MEXICO CITY,MEXICO. RP SATHAYE, J (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,MS 90-4000,BERKELEY,CA 94720, USA. OI Gadgil, Ashok/0000-0002-0357-9455 NR 15 TC 7 Z9 7 U1 0 U2 5 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD FEB PY 1994 VL 22 IS 2 BP 163 EP 171 DI 10.1016/0301-4215(94)90133-3 PG 9 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA NE654 UT WOS:A1994NE65400009 ER PT J AU FELTON, JS AF FELTON, JS TI HETEROCYCLIC AMINE-INDUCED CANCER AND MYOCARDIAL LESIONS IN NONHUMAN-PRIMATES SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Letter RP FELTON, JS (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD FEB PY 1994 VL 102 IS 2 BP 138 EP 139 DI 10.2307/3431598 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA NC418 UT WOS:A1994NC41800004 PM 8033833 ER PT J AU FENDORF, SE LAMBLE, GM STAPLETON, MG KELLEY, MJ SPARKS, DL AF FENDORF, SE LAMBLE, GM STAPLETON, MG KELLEY, MJ SPARKS, DL TI MECHANISMS OF CHROMIUM(III) SORPTION ON SILICA .1. CR(III) SURFACE-STRUCTURE DERIVED BY EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE SPECTROSCOPY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID OXIDE-WATER INTERFACE; SOLID-SOLUTION INTERFACE; ELECTRICAL DOUBLE-LAYER; ADSORPTION; MODEL; PRECIPITATION; (HYDR)OXIDES; HYDROLYSIS; COMPLEXES; HYDROXIDE AB Metal ion reactions at the solid/solution interface are important in an array of disciplines and are of environmental significance as such reactions can greatly affect the risk imposed by metals. The structural environment of metals at the solid/water interface determines their potential for remobilization to the aqueous environment and the physical/chemical modifications of the sorbent. In this study, extended X-ray absorption fine structure (EXAFS) spectroscopy was used to discern the local structural environment of Cr(III) sorbed on silica. Chromium(III) formed a monodentate surface complex on silica, with a Cr-Si distance of 3.39 angstrom. At the surface coverages investigated, a polynuclear chromium hydroxide surface phase occurred with Cr-Cr distances of 2.99 angstrom, indicative of edge-sharing Cr octahedra. Crystallographic parameters resulting from the measured atomic distances dictate that the surface phase was most likely of the gamma-CrOOH-type local structure. Environmental considerations of Cr(III) remobilization must therefore consider the chemical/physical properties of the monodentate surface-complexed Cr(III) and surface-nucleated chromium hydroxide. C1 UNIV DELAWARE,DEPT PLANT & SOIL SCI,NEWARK,DE. BROOKHAVEN NATL LAB,UPTON,NY 11973. DUPONT CO INC,ENGN TECHNOL LAB,WILMINGTON,DE 19880. RP FENDORF, SE (reprint author), UNIV IDAHO,DIV SOIL SCI,MOSCOW,ID 83844, USA. NR 31 TC 133 Z9 137 U1 3 U2 26 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 FEB PY 1994 VL 28 IS 2 BP 284 EP 289 DI 10.1021/es00051a015 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA MV347 UT WOS:A1994MV34700019 PM 22176174 ER PT J AU LIN, TF LITTLE, JC NAZAROFF, WW AF LIN, TF LITTLE, JC NAZAROFF, WW TI TRANSPORT AND SORPTION OF VOLATILE ORGANIC-COMPOUNDS AND WATER-VAPOR WITHIN DRY SOIL GRAINS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID LONG-TERM SORPTION; AQUIFER MATERIAL; DIFFUSION; SEDIMENTS; 1,2-DIBROMOETHANE; EQUILIBRIUM; DESORPTION; CHEMICALS; MECHANISM; SURFACES AB Mechanisms governing the rates of adsorption and desorption of benzene, trichloroethylene, and water vapor by dry soil grains are investigated. For three different test soils, determinations are made of organic carbon content, specific surface area, grain density, grain porosity, and pore size distribution. Experimental measurements of the rates of adsorption and desorption show that periods of hours are required to achieve equilibrium. In addition, adsorption is observed to be much faster than desorption. A porous sphere model accounting for internal diffusion in spherical grains coupled with a nonlinear Freundlich isotherm is used to interpret the sorption rate data. The model follows both adsorption and desorption trends reasonably well using a single fitted parameter, the effective diffusivity. The model also provides good resolution of the substantial asymmetry in the rates of uptake and release. In a refinement, a parallel pore model is used to account more fully for effects of the experimentally measured pore size distribution. C1 UNIV CALIF BERKELEY,DEPT CIVIL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RI Lin, Tsair-Fuh/C-4056-2008; Little, John/B-4154-2009; Lucas, Elizabeth/E-2733-2010; Nazaroff, William/C-4106-2008 OI Lin, Tsair-Fuh/0000-0002-2439-9090; Nazaroff, William/0000-0001-5645-3357 NR 36 TC 46 Z9 46 U1 0 U2 7 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 FEB PY 1994 VL 28 IS 2 BP 322 EP 330 DI 10.1021/es00051a020 PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA MV347 UT WOS:A1994MV34700024 PM 22176179 ER PT J AU ZAMZOW, DS BALDWIN, DP WEEKS, SJ BAJIC, SJ DSILVA, AP AF ZAMZOW, DS BALDWIN, DP WEEKS, SJ BAJIC, SJ DSILVA, AP TI IN-SITU DETERMINATION OF URANIUM IN SOIL BY LASER ABLATION-INDUCTIVELY COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ELEMENTAL ANALYSIS; VAPORIZATION; SPECTROSCOPY; TRANSMISSION; SAMPLES; FIBERS AB The concentration of uranium in soil has been determined for 80 sites in an area suspected to have uranium contamination by in situ laser ablation-inductively coupled plasma atomic emission spectrometry (LA-ICPAES), utilizing a field-deployable mobile analytical laboratory. For 15 of the 80 sites analyzed, soil samples were collected so that the field LA-ICPAES results could be compared to laboratory-determined values. Uranium concentrations determined in the field by LA-ICPAES for these 15 sites range from <20 parts per million (ppm) by weight to 285 ppm. The uncertainty in the values determined, however, is large relative to the uranium concentrations encountered at this site. The 95% confidence interval (CI) values are approximately 85 ppm. The uranium concentrations determined by laboratory LA-ICPAES analysis range from <20 to 102 ppm (95% CI of approximately 50 ppm); microwave dissolution and subsequent standard addition determination of uranium by solution nebulization ICPAES using an ultrasonic nebulizer yields 19-124 ppm uranium (95% CI of approximately 10 ppm). For 11 of the 15 samples, the field- and laboratory-determined uranium concentrations agree, within the uncertainty of the determined values. C1 US DOE,AMES LAB,AMES,IA 50011. NR 19 TC 9 Z9 9 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 FEB PY 1994 VL 28 IS 2 BP 352 EP 358 DI 10.1021/es00051a024 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA MV347 UT WOS:A1994MV34700028 PM 22176183 ER PT J AU MAHANEY, PA AF MAHANEY, PA TI EFFECTS OF FRESH-WATER PETROLEUM CONTAMINATION ON AMPHIBIAN HATCHING AND METAMORPHOSIS SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE AMPHIBIAN; CRANKCASE OIL; HYLA CINERA; METAMORPHOSIS; PETROLEUM CONTAMINATION ID COMPLEX LIFE-CYCLES; HYDROCARBONS; PREDATION; RUNOFF AB This study examined the effects of freshwater petroleum contamination on amphibian reproduction. The primary objectives were to assess the potential environmental and physiological impacts of runoff petroleum products on amphibians, using the green treefrog (Hyla cinerea) as a target species and engine crankcase oil as a contaminant. Egg hatching success, tadpole growth, and successful metamorphosis were measured in four concentrations of oil. The effects of oil on food source was also studied. Hatching success was not measurably influenced by the presence of oil. Tadpole and alga growth were negatively associated with the presence of oil. No tadpoles from the high concentration of oil treatments successfully metamorphosed. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP MAHANEY, PA (reprint author), UNIV GEORGIA,DEPT ZOOL,DRAWER E,AIKEN,SC 29802, USA. NR 41 TC 26 Z9 28 U1 1 U2 17 PU SETAC PRESS PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3370 SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD FEB PY 1994 VL 13 IS 2 BP 259 EP 265 DI 10.1897/1552-8618(1994)13[259:EOFPCO]2.0.CO;2 PG 7 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA MV349 UT WOS:A1994MV34900010 ER PT J AU AHMED, FE ANDERSON, RD AF AHMED, FE ANDERSON, RD TI FISHERY RESOURCES, CONSUMPTION AND IMPORT TRENDS, AND BIOTECHNOLOGY DEVELOPMENTS IN THE USA SO FISHERIES RESEARCH LA English DT Article AB Consumption of seafood in the USA has increased over the last decade and this trend is expected to continue. The 1989 National Marine Fisheries Service consumption figure was 15.9 lb of edible meat per person per year. Total commercial landings were a record 8.5 X 10(9) lb in 1989, and imported edible products totaled 3.2 x 10(9) lb. The majority of the seafood supply in the USA was taken from wild populations. The aquaculture portion of this supply is also expected to increase. A substantial amount of seafood (600 X 10(6) lb of finfish and 300 x 10(6) lb of shellfish) is caught recreationally. About 70% of commercially produced seafood in the USA is sold fresh or frozen. Canned seafood constitutes approximately 25%, and smoked/cured products 5%, of the seafood consumed. The USA exported 1.4 x 10(9) lb of edible domestic fishery products in 1989. Landings by the seafood industry are fragmented, diversified, seasonal, complex, and difficult to manage. Studies are needed to monitor changing consumption trends and patterns. The processing, distribution, and merchandising of finfish and shellfish will require more emphasis to reduce cross-contamination. Over 20% of seafood consumed in the USA is derived from recreational or subsistence fishing. Attention should be given to: (1) aquaculture, to produce high-quality, consistently available species; (2) landing, handling, distribution, and preparation of recreationally caught fish, to ensure consumer safety; (3) educating the industry and the consumer about safe handling practices, to reduce potential food-handling problems; (4) advances in biotechnology to insure adequate supply of exhaustable fishery resources; (5) developing international agreements to harmonize regulations and insure equivalence between domestic and imported products. RP AHMED, FE (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-7836 J9 FISH RES JI Fish Res. PD FEB PY 1994 VL 19 IS 1-2 BP 1 EP 15 DI 10.1016/0165-7836(94)90011-6 PG 15 WC Fisheries SC Fisheries GA MY252 UT WOS:A1994MY25200001 ER PT J AU STEINMAN, AD AF STEINMAN, AD TI THE INFLUENCE OF PHOSPHORUS ENRICHMENT ON LOTIC BRYOPHYTES SO FRESHWATER BIOLOGY LA English DT Article ID AQUATIC BRYOPHYTES; STREAM ECOSYSTEM; WOODLAND STREAM; PERIPHYTON; COMMUNITY; MACROPHYTES; GROWTH; MOSS; PHOTOSYNTHESIS; DISTURBANCE AB 1. Phosphorus enrichments of 5 weeks' duration were performed in two woodland streams in eastern Tennessee, U.S.A. to determine their effect on the dominant stream bryophyte, Porella pinnata. 2. In a second-order reach of Walker Branch, which had an N:P ratio (by atoms) of 3.5:1 in the stream water, the P:C ratio of Porella was not significantly affected by enrichment, but the P:N ratio did increase significantly. In Sludge Creek, which had an N:P ratio of 21.6:1 in the stream water, both P:C and P:N ratios of Porella increased significantly following phosphorus addition. Increased phosphorus ratios may have resulted from either assimilation or adsorption. 3. Absolute phosphorus concentrations in Porella tissue were significantly greater prior to enrichment in the control reach of Walker Branch, confounding the effect of phosphorus enrichment. In Sludge Creek, absolute phosphorus content in Porella tissue increased significantly in the treated reach and showed no significant difference in the control reach. 4. Although mean primary production increased by approximately 15% following enrichment, the increase was not significantly different from that prior to enrichment. 5. Epiphyte structure and abundance were not significantly influenced by enrichment in either stream. It is suggested that grazing pressure by snails may have masked any potential epiphyte response to enrichment. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. OI Steinman, Alan/0000-0002-4886-4305 NR 40 TC 9 Z9 9 U1 1 U2 6 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0046-5070 J9 FRESHWATER BIOL JI Freshw. Biol. PD FEB PY 1994 VL 31 IS 1 BP 53 EP 63 DI 10.1111/j.1365-2427.1994.tb00838.x PG 11 WC Marine & Freshwater Biology SC Marine & Freshwater Biology GA MV701 UT WOS:A1994MV70100005 ER PT J AU BOOHER, HB MARTELLO, DV TAMILIA, JP IRDI, GA AF BOOHER, HB MARTELLO, DV TAMILIA, JP IRDI, GA TI MICROSCOPIC STUDY OF SPHERES AND MICROSPHERES IN FLY-ASH SO FUEL LA English DT Article DE FLY ASH; SPHERICAL PARTICULATES; MICROSCOPY ID ELECTRON-MICROSCOPY; COMBUSTION AB Spherical particulates in fly ash from two bituminous coals, two subbituminous coals and one lignite have been studied by interference contrast polarized light microscopy (ICT-PLM) and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS). Most of the glassy spheres were between 8 and 50 mu m in diameter. Second phase material was seen on many of the solid sphere surfaces. Microspheres attached to the surfaces of larger spheres were found to have different compositions from that of the host sphere. Microparticulate capture by the larger spheres is a phenomenon that needs more study before the capture mechanism and its efficiency can be understood. RP BOOHER, HB (reprint author), PITTSBURGH ENERGY TECHNOL CTR,DIV INDIRECT LIQUEFACT,POB 10940,PITTSBURGH,PA 15263, USA. NR 15 TC 14 Z9 14 U1 1 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD FEB PY 1994 VL 73 IS 2 BP 205 EP 213 DI 10.1016/0016-2361(94)90115-5 PG 9 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MT333 UT WOS:A1994MT33300008 ER PT J AU BALTRUS, JP DIEHL, JR AF BALTRUS, JP DIEHL, JR TI AN INVESTIGATION OF THE WEATHERING BEHAVIOR OF COAL-DERIVED PYRITE SURFACES BY X-RAY PHOTOELECTRON-SPECTROSCOPY SO FUEL LA English DT Article DE WEATHERING; COAL-DERIVED PYRITE SURFACES; X-RAY ID OXIDATION; AIR AB The effects of relative humidity and oxygen partial pressure on the relative rates of surface oxidation of pyrites derived from various coal seams have been measured using X-ray photoelectron spectroscopy (XPS). The surface oxidation rate of the coal-derived pyrites was influenced to a greater extent by relative huumidity than by oxygen partial pressure. Pyrites derived from separate coal seams were found to oxidize at different rates and ultimately to different extents under the same weathering conditions. The observed differences in oxidation rates may partly be related to the level of impurities in the pyrites. RP BALTRUS, JP (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 18 TC 4 Z9 4 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD FEB PY 1994 VL 73 IS 2 BP 229 EP 235 DI 10.1016/0016-2361(94)90118-X PG 7 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA MT333 UT WOS:A1994MT33300011 ER PT J AU SHADLE, LJ SESHADRI, KS WEBB, DL AF SHADLE, LJ SESHADRI, KS WEBB, DL TI CHARACTERIZATION OF SHALE OILS .1. ANALYSIS OF FISCHER ASSAY OILS AND THEIR AROMATIC FRACTIONS USING ADVANCED ANALYTICAL TECHNIQUES SO FUEL PROCESSING TECHNOLOGY LA English DT Article ID COAL-DERIVED LIQUIDS; FT-IR SPECTROSCOPY; GAS-CHROMATOGRAPHY; C-13 NMR; SRC-II; SPECTROMETRY; DISTILLATES; SEPARATION AB High-temperature, short-contact-time pyrolysis of oil shales was investigated in our laboratory to gain a better understanding of the reaction mechanisms of kerogen decomposition. In order to accomplish this goal, the chemical composition of condensable materials and compositional differences between these materials and oils produced by low-temperature slow-heating processes were obtained. Analytical techniques that can analyze samples in microgram quantities, such as high performance liquid chromatography (HPLC), proton nuclear magnetic resonance (NMR) spectroscopy, field ionization mass spectroscopy (FIMS), and synchronous fluorescence (SF) spectroscopy were chosen for product characterization. Liquid chromatography was used in this work to separate shale oils into class types as well as in product characterization. Our work was in two phases. The first phase was on conventional oils. Here, HPLC as a tool for the separation of the aromatic fraction into subfractions according to the ring sizes and the possibility of using FIMS for a detailed compositional analysis of aromatic fraction of a fuel were investigated. The results were encouraging. The subfractions of the aromatic fraction were also analyzed using SF. The results of SF validated the HPLC separation procedure. In any case, the thrust of this research was to combine the results of several techniques to obtain meaningful and reliable characterization of oil shale pyrolysis products. This report covers the results obtained for oils produced by low-temperature slow-heating processes. C1 EG&G,WASHINGTON ANALYT SERV CTR,MORGANTOWN OPERAT,MORGANTOWN,WV 26507. WINSTON SALEM UNIV,DEPT NAT SCI,WINSTON SALEM,NC 27110. RP SHADLE, LJ (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,POB 880,MORGANTOWN,WV 26507, USA. OI Shadle, Lawrence/0000-0002-6283-3628 NR 21 TC 11 Z9 11 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3820 J9 FUEL PROCESS TECHNOL JI Fuel Process. Technol. PD FEB PY 1994 VL 37 IS 2 BP 101 EP 120 DI 10.1016/0378-3820(94)90010-8 PG 20 WC Chemistry, Applied; Energy & Fuels; Engineering, Chemical SC Chemistry; Energy & Fuels; Engineering GA MY998 UT WOS:A1994MY99800001 ER PT J AU SHADLE, LJ SESHADRI, KS WANG, YHC AF SHADLE, LJ SESHADRI, KS WANG, YHC TI CHARACTERIZATION OF SHALE OILS .2. ANALYSIS OF THE FLASH PYROLYSIS PRODUCTS OF OIL-SHALE IN THE GREEN RIVER FORMATION SO FUEL PROCESSING TECHNOLOGY LA English DT Article ID COAL AB The results of experiments to rapidly pyrolyze oil shale from the Green River Formation using a xenon flash lamp reactor are presented. A variety of analytical tools were used to determine the composition of the liquid products and to compare the rapid pyrolysis products with those from conventional retorting processes. The tools included infrared, proton nuclear magnetic resonance, high performance liquid chromatography and field ionization mass spectroscopy. The reaction mechanisms of rapid pyrolysis were found to be different from those of slow-heating rate processes. Thermal fragmentations were non-selective, resulting in a broad range of high molecular weight components that contained more heteroaromatic functionality than in the products of conventional retorting. Other reactions that were found to differ in slow versus rapid pyrolysis were dehydrogenation of hydroaromatic compounds and formation of condensed and noncondensed aromatic compounds. As the input energy to oil shale is increased, even though the oil shale was heated to high temperatures, the liquid products still contained significant amounts of alkanes and olefins. Based on these results, the high conversion of kerogen by rapid pyrolysis produces a low quality fuel which would require upgrading before utilization. C1 EG&G,WASHINGTON ANALYT SERV CTR,MORGANTOWN OPERAT,MORGANTOWN,WV 26507. RP SHADLE, LJ (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,POB 880,MORGANTOWN,WV 26507, USA. OI Shadle, Lawrence/0000-0002-6283-3628 NR 31 TC 9 Z9 9 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3820 J9 FUEL PROCESS TECHNOL JI Fuel Process. Technol. PD FEB PY 1994 VL 37 IS 2 BP 121 EP 142 DI 10.1016/0378-3820(94)90011-6 PG 22 WC Chemistry, Applied; Energy & Fuels; Engineering, Chemical SC Chemistry; Energy & Fuels; Engineering GA MY998 UT WOS:A1994MY99800002 ER PT J AU BAITY, FW GOULDING, RH HOFFMAN, DJ RYAN, PM DEGRASSIE, JS PETTY, CC PINSKER, RI AF BAITY, FW GOULDING, RH HOFFMAN, DJ RYAN, PM DEGRASSIE, JS PETTY, CC PINSKER, RI TI THE TECHNOLOGY OF FAST-WAVE CURRENT DRIVE ANTENNAS SO FUSION ENGINEERING AND DESIGN LA English DT Article ID JFT-2M TOKAMAK; ICRF ANTENNAS; JET; ABSORPTION; TEXTOR; ARRAY AB The design of antenna arrays for fast wave current drive (FWCD) involves several issues and trade-offs in addition to the usual considerations in the design of fast wave antennas for plasma heating. One feature of a well-designed FWCD antenna is that it will function efficiently for plasma heating when phased symmetrically. Most of the antennas in use today on major fusion experiments were designed solely for heating and are generally not suitable for current drive. New RF systems capable of addressing FWCD are being installed on a number of machines, including DIII-D and the Joint European Torus (JET). C1 GEN ATOM CO,SAN DIEGO,CA 92138. RP BAITY, FW (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 34 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP 91 EP 102 DI 10.1016/0920-3796(94)90040-X PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900008 ER PT J AU GOULDING, RH BAITY, FW HOFFMAN, DJ RYAN, PM MAYBERRY, MJ PINSKER, RI PETTY, CC AF GOULDING, RH BAITY, FW HOFFMAN, DJ RYAN, PM MAYBERRY, MJ PINSKER, RI PETTY, CC TI PHASED OPERATION OF THE DIII-D FWCD ANTENNA-ARRAY WITH A SINGLE POWER SOURCE SO FUSION ENGINEERING AND DESIGN LA English DT Article ID JFT-2M TOKAMAK; ABSORPTION AB A phasing and matching system has been designed and implemented for the four-element fast wave current drive (FWCD) antenna array on DIII-D, This system permits phased operation using a single transmitter. Coupled power levels of 1.1 Mw have been reached with relative phasing of +/-pi/2 and equal magnitudes of current and voltage on all four lines. Use of a single power source requires the achievement of amplitude and phase control at high power, without feedback control of these quantities. The system uses only standard components consisting of transmission lines, unmatched tees, and manually controlled phase shifters and stubs. Phasing, matching, and amplitude control for all four current straps are done using a total of five tuning elements. This simplification is achieved through the use of two resonant loops, each connecting a pair of straps. A tuning algorithm developed for the system produces accurate matching, phasing, and amplitude balance within a small number of shots (less than or equal to 5) in cases where the loading is sufficiently high, that is, when the resonant series load resistance (RSLR) > 2 Omega, at values of k rho approaching 1. A coupled transmission line model of the antenna array and resonant loops has been created and used to determine changes in resistive and reactive loading, as well as changes in coupling between array elements during plasma shots. The design and modeling of this system and the operating experience are reviewed. C1 GEN ATOM CO,SAN DIEGO,CA 92138. RP GOULDING, RH (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. RI Goulding, Richard/C-5982-2016 OI Goulding, Richard/0000-0002-1776-7983 NR 24 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP 103 EP 133 DI 10.1016/0920-3796(94)90041-8 PG 31 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900009 ER PT J AU RYAN, PM BAITY, FW GOULDING, RH HASTE, GR HOFFMAN, DJ ROTHE, KE WHEALTON, JH AF RYAN, PM BAITY, FW GOULDING, RH HASTE, GR HOFFMAN, DJ ROTHE, KE WHEALTON, JH TI METHODS OF CALCULATING SELECTED GEOMETRICAL EFFECTS IN THE DESIGN OF ICRH ANTENNAS SO FUSION ENGINEERING AND DESIGN LA English DT Article ID ION-CYCLOTRON RANGE; FARADAY SHIELDS; FAST WAVES; DIII-D; PLASMA; FREQUENCIES; FIELDS; JET AB This paper discusses the effects of realistic antenna geometry on the design and performance of ion cyclotron resonance heating (ICRH) antennas and presents methods to calculate these effects and to modify performance predictions that are based on idealized antenna geometry. It emphasizes the engineering aspects of antenna design, such as the electrical characterization of the antenna for inclusion into the power distribution network, as well as detailed analysis of the Faraday shield structure. The analysis of the Faraday shield includes the calculation of the shield's power transmission and dissipation properties (rf load), its effect on the strap phase velocity and characteristic impedance, and the rf heat distribution for the purpose of thermal analysis. The finite antenna length and its interaction with the recessed cavity and reduced phase velocity are presented in terms of an effective antenna length. Calculation of interstrap coupling with slotted septa separating the straps is presented, including a discussion of the basic trade-offs between directionality, loading, and circuit stability in the case of directional phased arrays for fast wave current drive at ICRH frequencies. RP RYAN, PM (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Goulding, Richard/C-5982-2016 OI Goulding, Richard/0000-0002-1776-7983 NR 31 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP 135 EP 157 DI 10.1016/0920-3796(94)90042-6 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900010 ER PT J AU SWAIN, DW YUGO, JJ WILLIAMSON, DE RIEMER, BW AF SWAIN, DW YUGO, JJ WILLIAMSON, DE RIEMER, BW TI ION-CYCLOTRON HEATING-SYSTEM DESIGN FOR BPX SO FUSION ENGINEERING AND DESIGN LA English DT Article ID DISRUPTIONS; PHYSICS AB The ion cyclotron heating system for the Burning Plasma Experiment (BPX) is required to deliver at least 20 MW of rf power to the plasma for pulse lengths of up to 15 s over a range of plasma operating conditions (e.g., average plasma densities from 0.5 x 10(20) to 4.5 X 10(20) m(-3), toroidal fields from 5 to 8 T). Because of the high, reactor-like energy density in the fusion plasma, the antenna and first wall will be exposed to significantly higher thermal loads and disruption forces than present-generation antennas. The increased loads have a major influence on the design choices that are made. Calculations indicate that the antenna for BPX would survive the anticipated environment, but only with proper choice of materials and design. RP SWAIN, DW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI Riemer, Bernard/0000-0002-6922-3056 NR 18 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP 173 EP 189 DI 10.1016/0920-3796(94)90044-2 PG 17 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900012 ER PT J AU HASTE, GR BAITY, FW BARBER, GC BIGELOW, TS CARTER, MD GARDNER, WL GOULDING, RH HOFFMAN, DJ RYAN, PM SHEPARD, TD AF HASTE, GR BAITY, FW BARBER, GC BIGELOW, TS CARTER, MD GARDNER, WL GOULDING, RH HOFFMAN, DJ RYAN, PM SHEPARD, TD TI THE FOLDED WAVE-GUIDE - A HIGH-FREQUENCY RF LAUNCHER SO FUSION ENGINEERING AND DESIGN LA English DT Article ID WAVE-GUIDE; ICRF AB The folded waveguide, an alternative to loop antennas for launching power in the ion cyclotron range of frequencies (ICRF) into plasma devices, operates as a cavity with apertures for coupling RF power to the plasma. The RF field pattern is similar to that of a loop antenna, but with a lower ratio of electric to magnetic field. Power enters from a coaxial line via a sliding contact, whose position matches impedances between the coaxial line and the folded waveguide. The folded waveguide has operated at 1 MW and promises high power density. Calculations indicate a factor of 4 increase in power handling capability over a comparable loop antenna. The possible use of the folded waveguide on several tokamaks is discussed. RP HASTE, GR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 14 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP 191 EP 204 DI 10.1016/0920-3796(94)90045-0 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900013 ER PT J AU MAU, TK EHST, DA HOFFMAN, DJ AF MAU, TK EHST, DA HOFFMAN, DJ TI THE RADIOFREQUENCY CURRENT-DRIVE SYSTEM FOR THE ARIES-I TOKAMAK POWER-REACTOR SO FUSION ENGINEERING AND DESIGN LA English DT Article ID BOOTSTRAP CURRENT; FAST WAVES; DIII-D; PLASMAS; EFFICIENCY; INJECTION; COUPLER; RANGE AB Fast waves in the ion cyclotron range of frequencies are proposed as the reference current driver for the ARIES-I conceptual tokamak power reactor. An RF power of 100 MW at 141 MHz is launched from above the plasma outboard midplane to drive the required 3.3 MA seed current in the core. Folded waveguides are used as wave launchers because of their observed higher power-handling capability compared to loops, and compact and robust structure. The wave guide will be made of silicon-carbide matrix composite material embedded with copper near the surface, in order to take advantage of its favorable safety and environmental features. The entire coupler system is compact, consisting of two poloidally stacked 12-waveguide toroidal arrays with a directivity of less than or equal to 95% and a coupling efficiency of similar to 97%. The RF current-drive system uses primarily technologies that require a reasonably modest development program to reach its projected efficiency of 71% in 30-40 years. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MAU, TK (reprint author), UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024, USA. NR 55 TC 4 Z9 4 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP 205 EP 227 DI 10.1016/0920-3796(94)90046-9 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900014 ER PT J AU BAKER, CC HOFFMAN, DJ AF BAKER, CC HOFFMAN, DJ TI TOPICAL ISSUE ON THE ION-CYCLOTRON RADIOFREQUENCY (ICRF) TECHNOLOGY - INTRODUCTION SO FUSION ENGINEERING AND DESIGN LA English DT Editorial Material RP BAKER, CC (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,POB 2009,OAK RIDGE,TN 37831, 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD FEB PY 1994 VL 24 IS 1-2 BP U5 EP U5 PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NF579 UT WOS:A1994NF57900001 ER PT J AU SEITZ, JC BLENCOE, JG JOYCE, DB BODNAR, RJ AF SEITZ, JC BLENCOE, JG JOYCE, DB BODNAR, RJ TI VOLUMETRIC PROPERTIES OF CO2-CH4-N2 FLUIDS AT 200-DEGREES-C AND 1000 BARS - A COMPARISON OF EQUATIONS OF STATE AND EXPERIMENTAL-DATA SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 4th Biennial Pan-American Conference on Research on Fluid Inclusions (Pacrofi IV) CY MAY 22-24, 1992 CL LAKE ARROWHEAD, CA ID THERMODYNAMIC PROPERTIES; CH4-CO2-H2O SYSTEM; PHASE-EQUILIBRIA; CARBON-DIOXIDE; TERNARY-SYSTEM; HIGH-PRESSURE; INCLUSIONS; 1000-DEGREES-C; 50-DEGREES-C; TEMPERATURE AB Predictions of molar volume, excess molar volume, and isochoric P-T trajectories from thirteen published equations of state are compared with one another and with preliminary volumetric data for CO2-CH4-N2 fluids at 200-degrees-C and 1000 bars. The equations of state investigated represent a wide variety of empirical and semi-empirical approaches to the modeling of fluids. The experimental data indicate that excess volumes of CO2-CH4-N, mixtures are small (<3% of the total volume of the mixture, except near the critical point Of CO2). The NIST software package DDMIX yields volumetric properties that are most consistent with our experimental results. Differences in the calculated volumetric properties of mixtures from the different equations of state are significant. For example, estimates of the equilibrium trapping temperature of a fluid inclusion (2000 bars, 60% CO2-20% CH4-20% N2 mixture, V = 59.10 cm3/mol) calculated from various equations of state range from 462-570-degrees-C. The major source of error in calculated volumetric properties of fluid mixtures is the inability of equations of state to accurately predict the volumetric properties of the pure components. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT GEOL SCI,BLACKSBURG,VA 24061. RP SEITZ, JC (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,BLDG 4500S,OAK RIDGE,TN 37831, USA. RI Bodnar, Robert/A-1916-2009 NR 28 TC 15 Z9 16 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 FEB PY 1994 VL 58 IS 3 BP 1065 EP 1071 DI 10.1016/0016-7037(94)90572-X PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MZ242 UT WOS:A1994MZ24200003 ER PT J AU NORMAN, DI MUSGRAVE, JA AF NORMAN, DI MUSGRAVE, JA TI N2-AR-HE COMPOSITIONS IN FLUID INCLUSIONS - INDICATORS OF FLUID SOURCE SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 4th Biennial Pan-American Conference on Research on Fluid Inclusions (Pacrofi IV) CY MAY 22-24, 1992 CL LAKE ARROWHEAD, CA ID ORE-FORMING SOLUTIONS; NEW-MEXICO; VALLES CALDERA; NOBLE-GASES; VOLCANIC GASES; ISOTOPIC COMPOSITION; HELIUM ACCUMULATION; FRESNILLO DISTRICT; GEOTHERMAL SYSTEM; UNITED-STATES AB A quadrupole mass spectrometer was used to measure bulk samples of conservative gas species N2, Ar, and He in fluid inclusions from a variety of hydrothermal systems. Analyses of these tracer elements help determine (1) if gases extracted by bulk inclusion analyses can provide accurate measurement of N2-Ar-He in active and fossil geothermal systems, (2) if hydrothermal fluids associated with paleogeothermal systems in a continental setting follow N2-Ar-He systematics similar to' those in the western Pacific Rim active geothermal systems, specifically New Zealand, and (3) whether different deposit types systematically vary with regard to N2-Ar-He. The N2-Ar-He ratios of fluid inclusion volatiles released from recently deposited minerals from the Valles system are similar to those of present day Valles thermal waters. Those inclusion samples from deep within the Valles system, below a regional aquitard, increase in N2. Compositions for inclusions from the Questa and Copper Flat-porphyry deposits are N2-rich, similar to those of arc-related volcanic gases, whereas those from Taylor Creek Sn deposit appear to be mixtures of magmatic and crustal components. N2-Ar-He ratios of the Precambrian Tribag deposit suggest a basalt source, but significant levels of self-generated He from U and Th in the inclusion fluids are also possible. Inclusions from two epithermal deposits with low-salinity inclusions have N2-Ar-He ratios trending towards air-saturated meteoric waters (ASW), and those inclusions with higher salinities indicate minor to no ASW component. The N2-Ar-He ratios in Fresnillo and Cochiti inclusions, which have magmatic helium isotopic ratios, indicate additions of magmatic gases to meteoric fluids. Inclusions from sediment-hosted deposits that contain hydrocarbon-bearing brines are He-rich, as are meteoric waters with a long residence time in the crust. At relevant pressure-temperature-composition conditions, Henry's Law constants of N2, Ar. and He are similar. and thus, the relative amounts of these species trapped under boiling conditions will not vary appreciably from solubility-controlled amounts in coexisting liquid. Furthermore, there is no evidence of He loss or gain in inclusions by diffusion process. Data from the various systems that were examined indicate that fluid inclusion N2-Ar-He compositions may be related to magmatic fluid, sedimentary brine, deep circulating meteoric fluid, and shallow circulating meteoric fluid sources, which we modified from those proposed by GIGGENBACH (1986). Relationships between the N2-Ar-He tracer gases and other measurable quantities in fluid inclusions are indicated to be helpful in understanding fluid mixing processes in paleogeothermal systems. C1 LOS ALAMOS NATL LAB,INC-9,LOS ALAMOS,NM 87545. RP NORMAN, DI (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT GEOSCI,SOCORRO,NM 87801, USA. NR 86 TC 50 Z9 71 U1 3 U2 18 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 FEB PY 1994 VL 58 IS 3 BP 1119 EP 1131 DI 10.1016/0016-7037(94)90576-2 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MZ242 UT WOS:A1994MZ24200007 ER PT J AU BRADY, PV AF BRADY, PV TI ALUMINA SURFACE-CHEMISTRY AT 25, 40, AND 60-DEGREES-C SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID OXIDE-WATER INTERFACE; TEMPERATURE-DEPENDENCE; HYDROUS GAMMA-AL2O3; DISSOLUTION RATES; ZERO CHARGE; ADSORPTION; 25-DEGREES-C; COMPLEXATION; SUSPENSIONS; SILICA AB Potentiometric titrations and metal adsorption measurements on gamma-Al2O3 at 25, 40, and 60-degrees-C indicate that alumina surface chemistry is temperature sensitive. The pH(zpc) of gamma-Al2O3 decreases slightly, if at all, from pH 6.45 at 25-degrees-C to 6.32 at 60-degrees-C. Metal binding constants for Cd++ and Pb++, calculated with a constant capacitance model. increase up to 1.5 orders of magnitude between 25-degrees-C and 60-degrees-C. Enthalpies of unidentate Pb and Cd binding are 21.3 and 8 1.8 kj/mol, respectively; these are similar in sign and magnitude to the enthalpies of metal hydrolysis. Because temperature favors the latter, surface coordination is favored by increasing temperature (i.e., and increasing depth in the crust). RP BRADY, PV (reprint author), SANDIA NATL LABS,ORG 6118,ALBUQUERQUE,NM 87185, USA. NR 36 TC 38 Z9 38 U1 0 U2 2 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 FEB PY 1994 VL 58 IS 3 BP 1213 EP 1217 DI 10.1016/0016-7037(94)90586-X PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MZ242 UT WOS:A1994MZ24200014 ER PT J AU SEDWICK, PN MCMURTRY, GM HILTON, DR GOFF, F AF SEDWICK, PN MCMURTRY, GM HILTON, DR GOFF, F TI CARBON-DIOXIDE AND HELIUM IN HYDROTHERMAL FLUIDS FROM LOIHI SEAMOUNT, HAWAII, USA - TEMPORAL VARIABILITY AND IMPLICATIONS FOR THE RELEASE OF MANTLE VOLATILES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID DE-FUCA RIDGE; ISOTOPE SYSTEMATICS; KILAUEA VOLCANO; NOBLE-GASES; MAUNA-LOA; BASALTS; CONSTRAINTS; GLASSES; RATIOS; CHEMISTRY AB Dissolved CO2, deltaC-13, He, and He-3/He-4 were determined in warm (<30-degrees-C) hydrothermal fluids from Pele's Vents on the summit of Loihi Seamount, Hawaii, collected during DSRV Pisces V dives in August and September 1992. Total dissolved CO2 and He are highly enriched over ambient seawater, with maximum measured concentrations of 190 mmol/kg CT and 0.193 mumol/kg He, and correlate linearly with dissolved Si concentration and sample temperature. Carbon dioxide deltaC-13 values range from -5.5 to -1.7 parts per thousand (PDB) and corrected He-3/He-4 ratios range from 21.7 to 27.0R(a), indicating a primary magmatic source for both gases. The high concentrations of these volatiles in the vent waters relative to reported bulk concentrations in Loihi basalts suggest that both gases are most likely introduced into the fluids by direct degassing from a magma body, rather than hydrothermal extraction from the summit lavas. Comparison of the He-3/He-4 ratios of the vent waters with reported values for Loihi basalts suggests that the mantle-derived volatiles in the fluids are variably contaminated by radiogenic He, probably due to assimilation of basement rock by the source magma. Such a mechanism could also be responsible for the range of He-3/He-4 ratios observed in lavas from Loihi. The data demonstrate remarkable temporal variation in the volatile content of the vent fluids: relative to fluid temperature, dissolved CO2 has decreased by approximately 30% compared to samples collected in 1987, whereas dissolved He concentrations are roughly one-twentieth the 1987 values; the CO2/He-3 ratios of the 1992 samples are approximately 17-27 X 10(9), an order of magnitude greater than the value of 2.3 X 10(9) reported for 1987 samples. We suggest that these temporal changes reflect progressive degassing from a magmatic intrusion with significant fractionation Of CO2 and He, a process which may also account for the range in C/He ratios of Loihi lavas. C1 UNIV HAWAII,SCH OCEAN & EARTH SCI & TECHNOL,DEPT OCEANOG,HONOLULU,HI 96822. FREE UNIV BERLIN,ER GEOCHEM,INST MINERAL,D-14195 BERLIN,GERMANY. LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. RI Hilton, David/B-7611-2008 NR 54 TC 35 Z9 35 U1 0 U2 7 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 FEB PY 1994 VL 58 IS 3 BP 1219 EP 1227 DI 10.1016/0016-7037(94)90587-8 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MZ242 UT WOS:A1994MZ24200015 ER PT J AU RICIPUTI, LR MCSWEEN, HY JOHNSON, CA PRINZ, M AF RICIPUTI, LR MCSWEEN, HY JOHNSON, CA PRINZ, M TI MINOR AND TRACE-ELEMENT CONCENTRATIONS IN CARBONATES OF CARBONACEOUS CHONDRITES, AND IMPLICATIONS FOR THE COMPOSITIONS OF COEXISTING FLUIDS SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID AQUEOUS ALTERATION; ION-MICROPROBE; MINERALOGY; MURCHISON; CALCITE; MATRIX; WATER AB Abundances of Fe, Mg, Mn, Sr, Na, B, and Ba in meteoritic calcites and dolomites have been determined using the ion microprobe. The compositions of these carbonates are consistent with their precipitation from, or recrystallization in equilibrium with, aqueous solutions at low temperatures. Coexisting calcites and dolomites in CM chondrites are not in equilibrium and presumably formed in distinct events. Calculated molar element/Ca ratios for fluids in equilibrium with these carbonates suggest that dolomites in CM and Cl chondrites formed from compositionally similar brines. Calcite solutions were also saline but lower in Mg, Fe, and Mn; calculations suggest that these solutions became more like dolomite solutions with increasing alteration of the host CM meteorite, reflecting progressive evolution of solution compositions. Asteroid brines may have formed by membrane filtration after the formation of compacted phyllosilicates lowered permeability, by addition of components to fluids during phyllosilicate-forming reactions, or through low-pressure boiling. Occurrences of vein-filling calcite, followed by dolomite and later by sulfates, in carbonaceous chondrites represent the final stages of a protracted aqueous alteration sequence. C1 UNIV TENNESSEE,DEPT GEOL SCI,KNOXVILLE,TN 37996. AMER MUSEUM NAT HIST,DEPT MINERAL SCI,NEW YORK,NY 10024. RP RICIPUTI, LR (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 35 TC 31 Z9 31 U1 0 U2 12 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 FEB PY 1994 VL 58 IS 4 BP 1343 EP 1351 DI 10.1016/0016-7037(94)90386-7 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NA419 UT WOS:A1994NA41900010 ER PT J AU LAUGHLIN, AW POTHS, J HEALEY, HA RENEAU, S WOLDEGABRIEL, G AF LAUGHLIN, AW POTHS, J HEALEY, HA RENEAU, S WOLDEGABRIEL, G TI DATING OF QUATERNARY BASALTS USING THE COSMOGENIC HE-3 AND C-14 METHODS WITH IMPLICATIONS FOR EXCESS AR-40 SO GEOLOGY LA English DT Article ID SUMMIT LAVAS; HELIUM; SURFACES; MAUI; NEON AB Concordant radiocarbon and cosmogenic He-3 dates of 3 and 11 ha on basalt flows and associated scoria deposits from the Zuni-Bandera volcanic field in New Mexico further substantiate published production rates and latitudinal and altitudinal corrections for He-3. Identical He-3 concentrations in coexisting olivine and clinopyroxene confirm that these two minerals have very similar production rates. A cosmogenic He-3 date of 57 ha on another flow is concordant with a U-series date and is younger than two K-Ar dates, suggesting that this flow contains excess Ar-40. This excess Ar-40 is also evident in gases released by vacuum crushing of olivine-clinopyroxene fractions from all three flows. RP LAUGHLIN, AW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 26 TC 58 Z9 58 U1 0 U2 3 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD FEB PY 1994 VL 22 IS 2 BP 135 EP 138 DI 10.1130/0091-7613(1994)022<0135:DOQBUT>2.3.CO;2 PG 4 WC Geology SC Geology GA MV539 UT WOS:A1994MV53900010 ER PT J AU PARMENTIER, EM SOTIN, C TRAVIS, BJ AF PARMENTIER, EM SOTIN, C TRAVIS, BJ TI TURBULENT 3-D THERMAL-CONVECTION IN AN INFINITE PRANDTL NUMBER, VOLUMETRICALLY HEATED FLUID - IMPLICATIONS FOR MANTLE DYNAMICS SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE FLUID DYNAMICS; MANTLE CONVECTION; TECTONICS ID 3-DIMENSIONAL CONVECTION; PACIFIC-OCEAN; EARTHS MANTLE; ALGORITHMS; PLANFORMS; TRANSITION; DEPENDENCE; RAYLEIGH; PLUMES; MODEL AB The structure and time dependence of 3-D thermal convection in a volumetrically heated, infinite Prandtl number fluid is examined for high values of the Rayleigh number. The methods employed allow the numerical experiments to proceed for long-enough times to derive good estimates of mean and fluctuating parts of the structure. An iterative multirigid method to solve for the buoyant, incompressible viscous flow at each time step of the energy equation is a novel aspect of the methodology. A simple explicit time step of the energy equation is utilized that vectorizes well on serial computers and which is ideally suited to massively parallel computers. Numerical experiments were carried out for Rayleigh numbers from 3 x 10(6) to 3 x 10(7) in a cartesian region with a prescribed temperature at the top boundary and an adiabatic bottom boundary. Over this complete range of Rayleigh number, the flow structure consists dominantly of cold, nearly axisymmetric plumes that migrate horizontally sweeping off the cold thermal-boundary layer that forms at the top of the convecting fluid. Plumes disappear by coalescing with other plumes; new plumes are created by thermal-boundary-layer instability. Sheet plumes form only occasionally and do not penetrate to significant depths in the fluid. Plumes have sizes comparable to the thickness of the thermal-boundary layer and an average spacing comparable to the fluid depth. No persistent large-scale motion in the fluid can be identified. Its absence may reflect the large subadiabatic stratification that develops beneath the thermal-boundary layer as cold plumes penetrate to the bottom boundary without thermally equilibrating with surrounding fluid. We consider the possible implications for convection in planetary mantles and for the existence of plate tectonics. C1 UNIV PARIS 11,PHYS TERRE & PLANETES LAB,F-91405 ORSAY,FRANCE. LOS ALAMOS NATL LAB,DIV EARTH & SPACE SCI,LOS ALAMOS,NM 87545. RP PARMENTIER, EM (reprint author), BROWN UNIV,DEPT GEOL SCI,PROVIDENCE,RI 02906, USA. NR 47 TC 52 Z9 53 U1 0 U2 4 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD FEB PY 1994 VL 116 IS 2 BP 241 EP 251 DI 10.1111/j.1365-246X.1994.tb01795.x PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MV542 UT WOS:A1994MV54200001 ER PT J AU JOHNSON, PA MCCALL, KR AF JOHNSON, PA MCCALL, KR TI OBSERVATION AND IMPLICATIONS OF NONLINEAR ELASTIC-WAVE RESPONSE IN ROCK SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Experiments in rock show a large nonlinear elastic wave response, far greater than that of gases, liquids and most other solids. The large response is attributed to structural discontinuities in rock such as microcracks and grain boundaries. The magnitude of the harmonics created by nonlinear interactions grows linearly with propagation distance in one-dimensional systems. In the earth, a large nonlinear response may be responsible for significant spectral alteration of a seismic wave at amplitudes and distances currently considered to be within the linear elastic regime. We argue, based on observations at ultrasonic frequencies, that the effect of nonlinear elasticity on seismic wave propagation may be large, and should be considered in modelling. RP JOHNSON, PA (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,MS D443,LOS ALAMOS,NM 87545, USA. NR 19 TC 38 Z9 42 U1 0 U2 4 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 FEB 1 PY 1994 VL 21 IS 3 BP 165 EP 168 DI 10.1029/93GL03162 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900002 ER PT J AU GOSLING, JT BAME, SJ MCCOMAS, DJ PHILLIPS, JL SCIME, EE PIZZO, VJ GOLDSTEIN, BE BALOGH, A AF GOSLING, JT BAME, SJ MCCOMAS, DJ PHILLIPS, JL SCIME, EE PIZZO, VJ GOLDSTEIN, BE BALOGH, A TI A FORWARD-REVERSE SHOCK PAIR IN THE SOLAR-WIND DRIVEN BY OVER-EXPANSION OF A CORONAL MASS EJECTION - ULYSSES OBSERVATIONS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PIONEER-10; LOOP; 1-AU AB A previously unidentified type of solar wind forward-reverse shock pair has been observed by Ulysses at 4.64 AU and S32.5-degrees. In contrast to most solar wind forward-reverse shock pairs, which are driven by the speed difference between fast solar wind plasma and slower plasma ahead, this particular shock pair was driven purely by the over-expansion of a coronal mass ejection, CME, in transit from the Sun. A simple numerical simulation indicates that the overexpansion was a result of a high initial internal plasma and magnetic field pressure within the CME. The CME observed at 4.64 AU had the internal field structure of a magnetic flux rope. This event was associated with a solar disturbance in which new magnetic loops formed in the corona almost directly beneath Ulysses approximately 11 days earlier. This association suggests that the flux rope was created as a result of reconnection between the ''legs'' of neighboring magnetic loops within the rising CME. C1 NOAA,SEL,BOULDER,CO 80303. SAN JUAN INST,SAN JUAN CAPISTRANO,CA. JET PROP LAB,PASADENA,CA 91109. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP GOSLING, JT (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 20 TC 72 Z9 72 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD FEB 1 PY 1994 VL 21 IS 3 BP 237 EP 240 DI 10.1029/94GL00001 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900020 ER PT J AU LAI, CH BODVARSSON, GS TRUESDELL, AH AF LAI, CH BODVARSSON, GS TRUESDELL, AH TI MODELING STUDIES OF HEAT-TRANSFER AND PHASE DISTRIBUTION IN 2-PHASE GEOTHERMAL-RESERVOIRS SO GEOTHERMICS LA English DT Article DE GEOTHERMAL RESERVOIRS; 2-PHASE GEOTHERMAL SYSTEMS; MODELING ID POROUS-MEDIA; STABILITY; SYSTEMS AB Phase distribution as well as mass flow and heat transfer behavior in two-phase geothermal systems have been studied by numerical modeling. A two-dimensional porous-slab model was used with a non-uniform heat flux boundary condition at the bottom. Steady-state solutions are obtained for the phase distribution and heat transfer behavior for cases with different mass of fluid (gas saturation) in place, permeabilities, and capillary pressures. The results obtained show very efficient heat transfer in the vapor-dominated zone due to the development of heat pipes and near-uniform saturations. The phase distribution below the vapor-dominated zone depends on permeability. For relatively high-permeability systems, single-phase liquid zones prevail, with convection providing the energy throughput. For lower permeability systems, a two-phase liquid-dominated zone develops, because single-phase liquid convection is not sufficient to dissipate heat released from the source. These results are consistent with observations from the field, where most high-temperature liquid-dominated two-phase systems have relatively low permeabilities (e.g. Krafla, Iceland; Olkaria, Kenya, Baca, New Mexico). The numerical results obtained also show that for high heat flow a high-temperature single-phase vapor zone can develop below a typical (240-degrees-C) vapor-dominated zone, as has recently been found at The Geysers, California, and Larderello, Italy. RP LAWRENCE BERKELEY LAB, DIV EARTH SCI, BERKELEY, CA 94720 USA. NR 26 TC 10 Z9 10 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0375-6505 EI 1879-3576 J9 GEOTHERMICS JI Geothermics PD FEB PY 1994 VL 23 IS 1 BP 3 EP 20 DI 10.1016/0375-6505(94)90042-6 PG 18 WC Energy & Fuels; Geosciences, Multidisciplinary SC Energy & Fuels; Geology GA PD734 UT WOS:A1994PD73400001 ER PT J AU GUTHRIE, G AF GUTHRIE, G TI MINERAL-COMPOSITION AND STRUCTURE SO GEOTIMES LA English DT Editorial Material RP GUTHRIE, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER GEOLOGICAL INST PI ALEXANDRIA PA 4220 KING ST, ALEXANDRIA, VA 22302-1507 SN 0016-8556 J9 GEOTIMES JI Geotimes PD FEB PY 1994 VL 39 IS 2 BP 26 EP 27 PG 2 WC Geosciences, Multidisciplinary SC Geology GA MU616 UT WOS:A1994MU61600031 ER PT J AU SWANSON, WP AF SWANSON, WP TI APPLICATION OF THE MOYER METHOD TO TRANSVERSE SHIELDING OF A LINEAR BREMSSTRAHLUNG SOURCE SO HEALTH PHYSICS LA English DT Article DE SHIELDING; ACCELERATORS; BREMSSTRAHLUNG; ELECTRONS AB The Moyer method is applied to the design of transverse shielding for an electron linear accelerator, assuming uniform beam power loss along the accelerator structure. The limitations of the method with respect to primary beam energy are discussed. Only the component of the radiation field due to bremsstrahlung is considered in this paper. Parameters for this application are given and sample calculations are shown. For a beam power loss uniformly distributed with distance along a straight line of 0.5 W m(-1), it is predicted that 1.2 m of concrete are needed to reduce the dose equivalent rate to 50 mu Sv h(-1) (1.39 x 10(-8) Sv s(-1)), at a transverse distance of3.5 m from the source. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV ENVIRONM HLTH & SAFETY, BERKELEY, CA 94720 USA. NR 12 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 FEB PY 1994 VL 66 IS 2 BP 155 EP 158 DI 10.1097/00004032-199402000-00004 PG 4 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 MT152 UT WOS:A1994MT15200004 PM 8282555 ER PT J AU KERR, GD AF KERR, GD TI MISSING DOSE FROM MORTALITY STUDIES OF RADIATION EFFECTS AMONG WORKERS AT OAK-RIDGE-NATIONAL-LABORATORY SO HEALTH PHYSICS LA English DT Note DE DOSE; HEALTH EFFECTS; EXPOSURE, OCCUPATIONAL; DOSIMETRY, PERSONNEL ID RISK AB Missing dose is a problem that has not been adequately addressed in the mortality studies of radiation effects among workers at Oak Ridge National Laboratory. The missing dose is a result of recording a zero for below-detectable doses, especially for frequent (weekly) film badge readings. To make the thorough dosimetry assessment needed in the current Oak Ridge National Laboratory worker studies, it will probably be necessary to consider all data at hand including personnel dose records, daily pocket meter readings used to supplement weekly and quarterly readings from other dosimeters, and monitoring results from both building surveys and fixed stations. The fixed-station data should be extremely useful in developing a better understanding of the unusual temporal variation of the external radiation doses to Oak Ridge National Laboratory workers during the high exposure-rate periods of the 1950s and early 1960s. RP KERR, GD (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, OAK RIDGE, TN 37831 USA. NR 13 TC 9 Z9 9 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 FEB PY 1994 VL 66 IS 2 BP 206 EP 208 DI 10.1097/00004032-199402000-00012 PG 3 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 MT152 UT WOS:A1994MT15200012 PM 8282563 ER PT J AU DAGLE, JE AF DAGLE, JE TI SMES BENEFIT ANALYSIS USING A PRODUCTION COST MODEL FOR PUGET-SOUND APPLICATION SO IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE LA English DT Article AB Superconducting magnetic energy storage (SMES) is an emerging technology that is expected to provide a means of storing electrical energy for use during peak demand periods. Pacific Northwest Laboratory (PNL) has estimated benefits and costs associated with the use of SMES technology and has provided insight into the overall future potential of SMES in the service area of the Bonneville Power Administration (BPA) and on systems that connect and exchange power with BPA. RP DAGLE, JE (reprint author), PACIFIC NW LAB, DEPT ENERGY SCI, 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 0885-8985 J9 IEEE AERO EL SYS MAG JI IEEE Aerosp. Electron. Syst. Mag. PD FEB PY 1994 VL 9 IS 2 BP 36 EP 39 DI 10.1109/62.260042 PG 4 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA MZ788 UT WOS:A1994MZ78800007 ER PT J AU FRITZ, IJ OLSEN, JA HOWARD, AJ BRENNAN, TM HAMMONS, BE VAWTER, GA AF FRITZ, IJ OLSEN, JA HOWARD, AJ BRENNAN, TM HAMMONS, BE VAWTER, GA TI STRAINED-LAYER-SUPERLATTICE TECHNOLOGY FOR VERTICAL-CAVITY OPTOELECTRONIC MODULATORS AT NEAR-INFRARED WAVELENGTHS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID QUANTUM-WELL STRUCTURES; REFRACTIVE-INDEX; EPITAXY; GAAS AB We present recent results on vertical Fabry-Perot cavity reflectance modulators grown using strained-layer epitaxy in the (InAlGa)As material system. Using molecular-beam epitaxy, we have successfully developed devices operating at wavelengths between 1.0 and 13 mum. Our approach employs a novel combination of strained and unstrained multilayers grown in a mechanically stable configuration to reach wavelengths longer than possible with lattice-matched (AlGa)As materials. The key to successful device operation is the growth of high-quality strain-relaxed buffer layers to provide an appropriate lattice constant for subsequent growth of the active device structure. For devices operating at 1.3 mum, we use buffer compositions graded to a final mismatch to the GaAs substrates of 2.4%. We discuss the optimization of surface smoothness of these relaxed buffers with respect to composition and growth temperature. We also investigate the dependence on growth temperature of the quality of the devices' mirror stacks and superlattice active regions. An optimized modulator structure has an rms surface roughness of 8.2 nm, corresponding to a calculated degradation in specular reflectance of only 0.4%. This device, which has a one-wavelength-thick cavity region, was designed for free-space communications applications. It has a 4 : 1 contrast ratio, exhibits a 4-dB insertion loss, and operates at a 5.5-V applied bias. RP FRITZ, IJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 20 TC 9 Z9 9 U1 2 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD FEB PY 1994 VL 30 IS 2 BP 452 EP 458 DI 10.1109/3.283793 PG 7 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NL693 UT WOS:A1994NL69300031 ER PT J AU FORTI, F WRIGHT, ME AF FORTI, F WRIGHT, ME TI MEASUREMENT OF MOS CURRENT MISMATCH IN THE WEAK INVERSION REGION SO IEEE JOURNAL OF SOLID-STATE CIRCUITS LA English DT Note ID TRANSISTORS; CAPACITORS AB We have measured the current matching properties of MOS transistors operated in the weak inversion region. We measured a total of about 1400 PMOS and NMOS transistors produced in four different processes and report here the results in terms of mismatch dependence on current density, device dimensions, and substrate voltage, without using any specific model for the transistor. C1 LAWRENCE BERKELEY LAB, DEPT ENGN, BERKELEY, CA 94720 USA. RP FORTI, F (reprint author), IST NAZL FIS NUCL, I-56010 PISA, ITALY. RI Forti, Francesco/H-3035-2011 OI Forti, Francesco/0000-0001-6535-7965 NR 6 TC 49 Z9 49 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9200 EI 1558-173X J9 IEEE J SOLID-ST CIRC JI IEEE J. Solid-State Circuit PD FEB PY 1994 VL 29 IS 2 BP 138 EP 142 DI 10.1109/4.272119 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA ND298 UT WOS:A1994ND29800009 ER PT J AU LU, B LU, YC CHENG, J LEIBENGUTH, RE ADAMS, AC ZILKO, JL ZOLPER, JC LEAR, KL CHALMERS, SA VAWTER, GA AF LU, B LU, YC CHENG, J LEIBENGUTH, RE ADAMS, AC ZILKO, JL ZOLPER, JC LEAR, KL CHALMERS, SA VAWTER, GA TI RECONFIGURABLE BINARY OPTICAL ROUTING SWITCHES WITH FAN-OUT BASED ON THE INTEGRATION OF GAAS/ALGAAS SURFACE-EMITTING LASERS AND HETEROJUNCTION PHOTOTRANSISTORS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID NETWORK AB The design, fabrication, and experimental demonstration of dynamically reconfigurable binary optical switches based on the integration of GaAs/AlGaAs vertical-cavity surface-emitting lasers and heterojunction phototransistors are reported. These new monolithic optical switches can perform spatial routing and optical amplification functions on input optical data with a fan-out of two, and can be programmed using simple voltage control. The 1 x 2 and 2 x 2 devices provide the basis for a high performance, two-dimensional optical switching fabric with electrical interfaces for optical switching and interconnection networks. C1 AT&T BELL LABS,BREMIGSVILLE,PA 18031. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP LU, B (reprint author), UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131, USA. NR 8 TC 12 Z9 12 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 1994 VL 6 IS 2 BP 222 EP 226 DI 10.1109/68.275433 PG 5 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ND865 UT WOS:A1994ND86500030 ER PT J AU DERI, RJ KALLMAN, JS DIJAILI, SP AF DERI, RJ KALLMAN, JS DIJAILI, SP TI QUANTITATIVE-ANALYSIS OF INTEGRATED-OPTIC WAVE-GUIDE SPECTROMETERS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID WAVE-GUIDES; SPECTROGRAPH; MODE AB We show how scalar diffraction theory can be used to quantitatively evaluate insertion losses in integrated optic spectrometers based on planar waveguide and etched grating technologies. This approach is applied to optimize the loss-limited spectral operating range of these devices. We also show how limitations in the photolithographic process used for grating definition can result in appreciable spectrometer insertion losses. RP DERI, RJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 14 TC 16 Z9 16 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 1994 VL 6 IS 2 BP 242 EP 244 DI 10.1109/68.275438 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ND865 UT WOS:A1994ND86500035 ER PT J AU FUERSCHBACH, PW CIESLAK, MJ AF FUERSCHBACH, PW CIESLAK, MJ TI RESTRAINT EFFECTS IN LASER-WELDING OF AN ALUMINUM MMC SO IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY PART B-ADVANCED PACKAGING LA English DT Article DE METAL MATRIX COMPOSITE; JOINT DESIGN; MICROWELDING; WELDABILITY; POROSITY; WELD CRACKING; ELECTRONIC PACKAGING AB Laser beam welding (LBW) of an aluminum metal matrix composite (alloy A40) with a low coefficient of thermal expansion has been investigated. It was found that the cracking propensity of this alloy when laser welded is affected considerably by the restraint conditions at the weld joint. A low restraint joint geometry was chosen that resulted in the completion of crack free alloy A40 welds using the pulsed Nd:YAG LBW process. In contrast, similarly processed welds made in a high restraint weld joint were found to be cracked after welding. The cracks were determined to be solid state cracks and no solidification cracking was indicated. High restraint weld joints between alloy A40 and aluminum alloys 6061 and 1100 were welded crack free. The absence of cracking here was attributed to the high ductility of these alloys which can better accommodate the weld induced shrinkage strains than alloy A40 by itself. It was found that alloy A40 has good absorptivity with the low continuous power CO2 LBW process, and that unlike pulsed laser welds in a high restraint joint geometry, that continuous power welds are crack free. RP FUERSCHBACH, PW (reprint author), SANDIA NATL LABS,DEPT PHYS & JOINING MET,ALBUQUERQUE,NM 87185, USA. NR 13 TC 2 Z9 2 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1070-9894 J9 IEEE T COMPON PACK B JI IEEE Trans. Compon. Packag. Manuf. Technol. Part B-Adv. Packag. PD FEB PY 1994 VL 17 IS 1 BP 108 EP 114 DI 10.1109/96.296438 PG 7 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA NZ219 UT WOS:A1994NZ21900018 ER PT J AU FASCHING, GE LOUDIN, WJ SMITH, NS AF FASCHING, GE LOUDIN, WJ SMITH, NS TI CAPACITIVE SYSTEM FOR 3-DIMENSIONAL IMAGING OF FLUIDIZED-BED DENSITY SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article AB The U.S. Department of Energy's Morgantown Energy Technology Center has been developing a capacitance imaging system (CIS) to support its fluidized-bed research programs. A second-generation system for capacitively imaging a cold, laboratory-scale, 15.24-cm diameter fluidized bed is described. The CIS acquires interelectrode, bed-crossing displacement current data to provide 193-pixel density values at four 2.54-cm vertically spaced levels and presents a three-dimensional density display at a rate of 30 maps per second in real time. The CIS also stores displacement current data at a rate of 60 density maps per level per second for post-run analysis. Different means of data processing are described that produce one method for real-time display and two methods for post-run analysis of data. The results of calibration and fluidization tests are presented, together with the errors associated with each of the methods for the known pixel densities in the calibration tests. Improvement in the calibration procedure to reduce these errors is proposed. Test results indicate the CIS would be a useful tool for research and monitoring operations in two-phase systems. RP FASCHING, GE (reprint author), MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507, USA. NR 11 TC 9 Z9 11 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 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD FEB PY 1994 VL 43 IS 1 BP 56 EP 62 DI 10.1109/19.286355 PG 7 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA NQ128 UT WOS:A1994NQ12800011 ER PT J AU FRICKEY, DA AF FRICKEY, DA TI CONVERSIONS BETWEEN S, Z, Y, H, ABCD, AND T PARAMETERS WHICH ARE VALID FOR COMPLEX SOURCE AND LOAD IMPEDANCES SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB This paper provides tables which contain the conversion between the various common two-port parameters, Z, Y, h, ABCD, S, and T. The conversion are valid for complex normalizing impedances. An example is provided which verifies the conversions to and from S parameters. RP FRICKEY, DA (reprint author), EG&G IDAHO INC,IDAHO FALLS,ID 83415, USA. NR 16 TC 143 Z9 150 U1 3 U2 13 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 FEB PY 1994 VL 42 IS 2 BP 205 EP 211 DI 10.1109/22.275248 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA NE460 UT WOS:A1994NE46000007 ER PT J AU WARNE, LK AF WARNE, LK TI EDDY-CURRENT POWER DISSIPATION AT SHARP CORNERS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB This paper develops corrections to the impedance per unit length when the conductor cross section includes sharp corners. The case of a right internal angle is treated in detail. Corrections are given for all real positive values of the ratio of internal to external magnetic permeabilities. Both the real and imaginary parts of the corrections are determined. Application of the results to a conductor of square cross section is given. Higher order terms are developed and compared to a numerical solution. These higher order terms are generalized to the conductor of rectangular cross section. RP WARNE, LK (reprint author), SANDIA NATL LABS,DEPT ELECTROMAGNET ANAL & TEST,ALBUQUERQUE,NM 87185, USA. NR 9 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 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD FEB PY 1994 VL 42 IS 2 BP 283 EP 290 DI 10.1109/22.275259 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA NE460 UT WOS:A1994NE46000018 ER PT J AU ASHKTORAB, K LEVINE, MJ SCHEETZ, RA AF ASHKTORAB, K LEVINE, MJ SCHEETZ, RA TI DATA-ACQUISITION SYSTEM FOR EXPERIMENT E866 AT THE BROOKHAVEN AGS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID DISTRIBUTED DATA ACQUISITION AB Experiment E866 consists of two spectrometers and related detectors for investigations of collisions of relativistic beams of Au ions with fixed targets at the Brookhaven AGS. The data acquisition system, consisting of 11 CPUs in a single VME crate, gathers data from 8 CAMAC crates and 6 FASTBUS crates. RP ASHKTORAB, K (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 5 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 13 EP 17 DI 10.1109/23.281449 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000003 ER PT J AU OLEYNIK, G ANDERSON, J APPLETON, L BERG, D BLACK, D ENGELFRIED, J FORSTER, B FRANZEN, J KENT, S KWARCIANY, R MEADOWS, J MOORE, C PORDES, R SLIMMER, D STREETS, J TREVIZO, O UDUMULA, L VITTONE, M VOTAVA, M WHITE, V GUSS, C MAJEWSKI, A ZIOULAS, G AF OLEYNIK, G ANDERSON, J APPLETON, L BERG, D BLACK, D ENGELFRIED, J FORSTER, B FRANZEN, J KENT, S KWARCIANY, R MEADOWS, J MOORE, C PORDES, R SLIMMER, D STREETS, J TREVIZO, O UDUMULA, L VITTONE, M VOTAVA, M WHITE, V GUSS, C MAJEWSKI, A ZIOULAS, G TI DART - DATA-ACQUISITION FOR THE NEXT-GENERATION OF FERMILAB FIXED TARGET EXPERIMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB DART is the name of the data acquisition effort for Fermilab experiments taking data in the '94-'95 time frame and beyond. Its charge is to provide a common system of hardware and software, which can be easily configured and extended to meet the wide range of data acquisition requirements of the experiments. Its strategy is to provide incrementally functional data acquisition systems to the experiments at frequent intervals to support the ongoing DA activities of the experiments. DART is a collaborative development effort between the experimenters and the Fermilab Computing Division. Experiments collaborating in DART cover a range of requirements from 400 Kbytes/sec event readout using a single DA processor, to 200 Mbytes/sec event readout involving 10 parallel readout streams, 10 VME event building planes and greater than 1000 MIPs of event filter processing. We describe the requirements, architecture, and plans for the project and report on its current status. C1 CORNELL UNIV,ITHACA,NY 14853. PENN STATE UNIV,UNIVERSITY PK,PA 16802. UNIV CALIF IRVINE,IRVINE,CA 92717. RP OLEYNIK, G (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 21 TC 8 Z9 8 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 45 EP 51 DI 10.1109/23.281454 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000008 ER PT J AU ENGBERG, D GLANZMAN, T AF ENGBERG, D GLANZMAN, T TI A SMALL UNIX-BASED DATA-ACQUISITION SYSTEM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB The proposed SLAC B Factory detector plans to use Unix-based machines for all aspects of computing, including real-time data acquisition and experimental control[1][2][3]. A R&D program has been established to investigate the use of Unix in the various aspects of experimental computation. Earlier R&D work[4] investigated the basic real-time aspects of the IBM RS/6000 workstation running AIX, which claims to be a real-time operating system. The next step in this R&D is the construction of a prototype data acquisition system which attempts to exercise many of the features needed in the final on-line system in a realistic situation. For this project, we have combined efforts with a team studying the use of novel cell designs and gas mixtures in a new prototype drift chamber[5]. RP ENGBERG, D (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 6 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 77 EP 79 DI 10.1109/23.281460 PN 1 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000014 ER PT J AU MACKINNON, B BERMAN, E CONSTANTAFANOURAKIS, P NICINSKI, T PETRAVICK, D PLUQUET, C PORDES, R RECHENMACHER, R SERGEY, G WILCER, N KENT, S MCKAY, T AF MACKINNON, B BERMAN, E CONSTANTAFANOURAKIS, P NICINSKI, T PETRAVICK, D PLUQUET, C PORDES, R RECHENMACHER, R SERGEY, G WILCER, N KENT, S MCKAY, T TI DEVELOPMENT OF THE SLOAN DIGITAL SKY SURVEY ONLINE SYSTEMS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB The Sloan Digital Sky Survey (SDSS)1 is an astrophysics project to produce a three dimensional map of a quarter of the Universe. We present a description of the SDSS prototype, the Drift Scan Camera (DSC) online system,2 WhiCh is operational and currently being deployed. We also present the status of the development of the SDSS online system. The hardware and software architectures for both systems are provided C1 FERMILAB NATL ACCELERATOR LAB,EXPTL ASTROPHYS GRP,BATAVIA,IL 60510. FERMILAB NATL ACCELERATOR LAB,DIV COMP,BATAVIA,IL 60510. RP MACKINNON, B (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT ONLINE SUPPORT,BATAVIA,IL 60510, USA. RI McKay, Timothy/C-1501-2009 OI McKay, Timothy/0000-0001-9036-6150 NR 12 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 105 EP 110 DI 10.1109/23.281468 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000022 ER PT J AU BURKE, M FELAWKA, L POUTISSOU, R ADLER, S HAGGERTY, J STRZELINSKI, R WITZIG, C AF BURKE, M FELAWKA, L POUTISSOU, R ADLER, S HAGGERTY, J STRZELINSKI, R WITZIG, C TI E787 DATA-ACQUISITION SOFTWARE ARCHITECTURE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB Brookhaven National Laboratory (BNL) Experiment 787's second generation Unix-based data aquisition system is comprised of several independent programs, each of which controls a specific aspect of the experiment. These programs include packages for reading events from the hardware systems, analyzing and reducing the data, distributing the results to various data consumers, and logging the data to tape or disk. Most of these can be run in stand-alone mode, for ease of development and testing. There are also a number of daemon processes for writing special data records to the data streams, and several monitor programs for evaluating and controlling the progress of the whole. Coordination of these processes is achieved through a combination of pipes, signals, shared memory, and FIFOs, overseen by the user through a Motif graphical user interface. The system runs on a Silicon Graphics 4D/320, interfaced to a Fastbus system through the BNL Fastbus/VME interface (BBFC), and runs under Irix and Motif/X-windows. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BURKE, M (reprint author), TRIUMF,4004 WESBROOK MALL,VANCOUVER V6T 2A2,BC,CANADA. NR 5 TC 2 Z9 2 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 131 EP 134 DI 10.1109/23.281473 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000027 ER PT J AU KOUZES, RT LOWRY, MM AF KOUZES, RT LOWRY, MM TI ACQUIRE - A DATA-ACQUISITION SYSTEM FOR CAMAC ON SUN WORKSTATIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB The data acquisition software package ACQUIRE has been used for many years by the Princeton University Cyclotron Laboratory for nuclear physics research applications. This code has been ported to the SUN Sparc workstation and is fully functional, including block data transfers using an in crate Event Handler. A SCSI interface to CAMAC is utilized, and the device handling software has been developed in such a way that little modification was needed in the ACQUIRE code for the SUN implementation. The Higz X windows graphics package from CERN is used for data display. ACQUIRE will be used for test and development of CAMAC based systems within the Molecular Science Research Center at Pacific Northwest Labortatory. C1 PRINCETON UNIV, PRINCETON, NJ 08544 USA. RP KOUZES, RT (reprint author), PACIFIC NW LAB, MSKI-87, POB 999, RICHLAND, WA 99352 USA. OI Lusiani, Alberto/0000-0002-6876-3288 NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 142 EP 144 DI 10.1109/23.281476 PN 1 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000030 ER PT J AU OLEYNIK, G APPLETON, L MACKINNON, B MOORE, C SERGEY, G UDUMULA, L GOERANSSON, G AF OLEYNIK, G APPLETON, L MACKINNON, B MOORE, C SERGEY, G UDUMULA, L GOERANSSON, G TI MURMUR - A MESSAGE GENERATOR AND REPORTER FOR UNIX, VMS, AND VX WORKS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB Murmur is a Unix based message generation, reporting, display and logging system that we have developed for use in data acquisition systems at Fermilab. Murmur is a tool for the Production and management of message reporting. Its usefulness ranges from software product development and maintenance to system level shakedown and diagnostics. Murmur provides a VMS MESSAGE-like function code generation utility, a client routine package for sending these codes over the network to a central server, and a server which translates the codes into meaningful visual information, writes the information to a logfile, and displays it on B&W or color X windows. Because Murmur stores message information in keyed access files, it can provide advanced features such as popping up help when a displayed message is clicked on by the mouse and executing ''action'' shell scripts when selected messages are received by the server. We describe Murmur [1] and some recent additions to its functionality. RP OLEYNIK, G (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT ONLINE SUPPORT,POB 500,BATAVIA,IL 60510, USA. NR 5 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 157 EP 160 DI 10.1109/23.281479 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000033 ER PT J AU VOTAVA, M KENT, S OLEYNIK, G PORDES, R PANGBURN, J PATRICK, J HEYES, G WATSON, WA AF VOTAVA, M KENT, S OLEYNIK, G PORDES, R PANGBURN, J PATRICK, J HEYES, G WATSON, WA TI FASTBUS STANDARD ROUTINES IMPLEMENTATION FOR FERMILAB EMBEDDED PROCESSOR BOARDS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB In collaboration with CEBAF, Fermilab has produced a new C implementation of the IEEE FASTBUS Standard Routines[1]1. This implementation runs under the VxWorks2 operating system and has been ported to the PC-4 revision of the FASTBUS Smart Crate Controller (FSCC)[2] and the FASTBUS Readout Controller (FRC)[3]. Both of these boards are used in fixed target and collider HEP experiments. Features of this implementation include: optional generation of high-speed in-line code, built-in RPC (remote producedure call) support, and a TCL(tool command language) [4]command line interpreter interface. We describe this software with recent extensions to support RPC. C1 FERMILAB NATL ACCELERATOR LAB,COLLIDER DETECTOR FACIL,BATAVIA,IL 60510. CEBAF,NEWPORT NEWS,VA 23606. RP VOTAVA, M (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT ONLINE SUPPORT,DIV COMP,POB 500,BATAVIA,IL 60510, USA. NR 5 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 1994 VL 41 IS 1 BP 165 EP 168 DI 10.1109/23.281481 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND860 UT WOS:A1994ND86000035 ER PT J AU BRITTON, CL ALLEY, GT SIMPSON, ML WINTENBERG, AL YAREMA, RJ ZIMMERMAN, T BOISSEVAIN, J COLLIER, W JACAK, BV SIMONGILLO, J SONDHEIM, W SULLIVAN, JP LOCKYER, N AF BRITTON, CL ALLEY, GT SIMPSON, ML WINTENBERG, AL YAREMA, RJ ZIMMERMAN, T BOISSEVAIN, J COLLIER, W JACAK, BV SIMONGILLO, J SONDHEIM, W SULLIVAN, JP LOCKYER, N TI DESIGN AND CHARACTERIZATION OF THE BVX - AN 8-CHANNEL CMOS PREAMPLIFIER-SHAPER FOR SILICON STRIPS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB This paper presents the design and characterization of an 8-channel preamplifier-shaper intended for use with silicon strip detectors ranging in capacitance from 1 to 20 pF. The nominal peaking time of the circuit is 200 ns with an adjustment range of +/-50 ns. The circuit has a pitch (width) of 85 mum/channel with a power dissipation of 1.2 mW/channel and has been fabricated in 2 mum p-wells CMOS. The 0 pF noise is 330 e with a noise slope of 64 e/pF. The design approach is presented as well as both test bench and strip detector measurements. C1 FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. RP BRITTON, CL (reprint author), OAK RIDGE NATL LAB, POB 2008, OAK RIDGE, TN 37831 USA. RI Simpson, Michael/A-8410-2011 OI Simpson, Michael/0000-0002-3933-3457 NR 5 TC 8 Z9 9 U1 0 U2 1 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 FEB PY 1994 VL 41 IS 1 BP 352 EP 355 DI 10.1109/23.281522 PN 2 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA ND862 UT WOS:A1994ND86200012 ER PT J AU NEAU, EL AF NEAU, EL TI ENVIRONMENTAL AND INDUSTRIAL APPLICATIONS OF PULSED-POWER SYSTEMS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT Annual International Conference on Plasma Science (ICOPS) CY JUN 07-09, 1993 CL VANCOUVER, CANADA ID FLUE-GAS TREATMENT; RADIATION TECHNOLOGY; IRRADIATION; PLANT AB The technology base formed by the development of high peak power simulators, laser drivers, free electron lasers, and Inertial Confinement Fusion drivers from the early 60's through the late 80's is being extended to high average power short-pulse machines with the capabilities of performing new roles in environmental cleanup applications and in supporting new types of industrial manufacturing processes. Processes requiring high volume throughput and moderate dose levels, such as flue gas cleanup and food pasteurization plants, will require very high average beam power levels of hundreds of kilowatts to perhaps several megawatts. Proposed processes requiring high dose levels, such as chemical waste mitigation, may also require several hundred kilowatt to megawatt beams. In this paper we briefly discuss a new class of short-pulse high average power accelerators, now operating in laboratory environments, using semiconductor and magnetic switches to achieve megavolt electron and ion beams with 10's of kiloamperes of current and average power levels in excess of 100 kW. The technology is modular, robust in concept, and appears to be suitable for extension to the megawatt power level. The modularity allows the same technology to accelerate electron and ion beams with pulses a few 10's of nanoseconds wide with potentials of one to 10's of MeV's and, by using fewer compression stages, also to drive applications requiring pulse widths of 100 nanoseconds to microseconds at accelerating potentials of 250 keV or more. The longer pulse applications, such as drivers for pulsed corona reactors for flue gas cleanup, require high average power and also benefit from the long life, high efficiency pulse compression technology. After a brief introduction to the technology, the paper then concentrates on specific application areas that are being explored because of the availability of the high specific energies and high average powers attainable with this new family of short-pulse machines. RP NEAU, EL (reprint author), SANDIA NATL LABS,DEPT PULSED POWER TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 58 TC 56 Z9 62 U1 0 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1994 VL 22 IS 1 BP 2 EP 10 DI 10.1109/27.281544 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NE108 UT WOS:A1994NE10800002 ER PT J AU BUNEMAN, R BARKER, RJ PERATT, AL BRECHT, SH LANGDON, AB LEWIS, HR AF BUNEMAN, R BARKER, RJ PERATT, AL BRECHT, SH LANGDON, AB LEWIS, HR TI A TRIBUTE TO BUNEMAN,OSCAR - PIONEER OF PLASMA SIMULATION SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT Annual International Conference on Plasma Science (ICOPS) CY JUN 07-09, 1993 CL VANCOUVER, CANADA ID 3 DIMENSIONS AB Highlights are presented from among the many contributions made by Oscar Buneman to the science, engineering, and mathematics communities. Emphasis is placed not only on ''what'' this pioneer of computational plasma physics contributed but, of equal importance, on ''how'' he made his contributions. Therein lies the difference between technical competence and scientific greatness. The picture which emerges illustrates the open-mindedness, enthusiasm, intellectual/physical stamina, imagination, intellectual integrity, interdisciplinary curiosity, and deep humanity that made this individual unique. As a gentleman and a scholar, he had mastered the art of making cold technical facts ''come to life.'' Oscar Buneman died peacefully at his home near Stanford University on Sunday, January 24th, 1993. The profound influence he has had on so many of his colleagues guarantees his immortality. C1 USAF,OFF SCI RES,DIRECTORATE PHYS & ELECTR,WASHINGTON,DC 20332. BERKELEY RES ASSOCIATES INC,BERKELEY,CA 94701. LOS ALAMOS NATL LAB,GRP P-15,LOS ALAMOS,NM 87545. LAWRENCE LIVERMORE NATL LAB,DIV X,LIVERMORE,CA 94550. DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755. NR 31 TC 2 Z9 2 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1994 VL 22 IS 1 BP 22 EP 30 DI 10.1109/27.281546 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NE108 UT WOS:A1994NE10800004 ER PT J AU TRUDNOWSKI, DJ AF TRUDNOWSKI, DJ TI ORDER REDUCTION OF LARGE-SCALE LINEAR OSCILLATORY SYSTEM MODELS SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article; Proceedings Paper CT IEEE/PES 1993 Winter Meeting CY JAN 31-FEB 05, 1993 CL COLUMBUS, OH SP IEEE, POWER ENGN SOC DE MODEL ORDER REDUCTION; OSCILLATORY SYSTEM MODELS; EIGENANALYSIS; PRONY ANALYSIS ID PRONY AB Eigenanalysis and signal analysis techniques of deriving representations of power system oscillatory dynamics result in very high-order linear models. In order to apply many modem control design methods, the models must be reduced to a more manageable order while preserving essential characteristics. Presented in this paper is a model reduction method well suited for large-scale power systems. The method searches for the optimal subset of the high-order model that best represents the system. An Akaike information criterion is used to define the optimal reduced model. The method is first presented, and then examples of applying it to Prony analysis and eigenanalysis models of power systems are given. RP TRUDNOWSKI, DJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 23 TC 45 Z9 47 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 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD FEB PY 1994 VL 9 IS 1 BP 451 EP 457 DI 10.1109/59.317578 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA NL152 UT WOS:A1994NL15200132 ER PT J AU TRUDNOWSKI, DJ AF TRUDNOWSKI, DJ TI ORDER REDUCTION OF LARGE-SCALE LINEAR OSCILLATORY SYSTEM MODELS - REPLY SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Discussion RP TRUDNOWSKI, DJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 1 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 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD FEB PY 1994 VL 9 IS 1 BP 458 EP 458 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA NL152 UT WOS:A1994NL15200134 ER PT J AU PIN, FG CULIOLI, JC REISTER, DB AF PIN, FG CULIOLI, JC REISTER, DB TI USING MINIMAX APPROACHES TO PLAN OPTIMAL TASK COMMUTATION CONFIGURATIONS FOR COMBINED MOBILE PLATFORM-MANIPULATOR SYSTEMS SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Article ID OBSTACLE AVOIDANCE; ROBOTS AB An important characteristics of mobile manipulators is their particular kinematic redundancy created by the addition of the degrees of freedom of the platform and those of the manipulator. This kinematic redundancy is very desirable since it allows mobile manipulators to operate under many modes of motion and to perform a wide variety of tasks. On the other hand, it also significantly complicates the problem of planning a series of sequential tasks, in particular for the critical times at which the system needs to ''switch'' from one task to the other (task commutation), with changes in mode of motion, task requirement, and task constraints. This paper focuses on the problem of planning the positions and configurations in which the system needs to be at task commutation in order to assure that it can properly initiate the next task to be performed. The concept of and need for ''commutation configurations'' in sequences of mobile manipulator tasks is introduced, and an optimization approach is proposed for their calculation during the task sequence planning phase. A variety of optimization criteria were previously investigated to optimize the task commutation configurations of the system when task requirements involve obstacle avoidance, reach, maneuverability, and optimization of strength. In this paper, we show that a ''minimax'' approach is particularly adapted for most of these requirements. We develop the corresponding criteria and discuss solution algorithms to solve the ''minimax'' optimization problems. An implementation of the algorithms of our HERMIES-III mobile manipulator is then described and sample results are presented and discussed. C1 ECOLE NATL SUPER MINES,PARIS,FRANCE. ECOLE NATL STAT & ADM ECON,MALAKOFF,FRANCE. ENSMP,AUTOMAT LAB,F-77305 FONTAINEBLEAU,FRANCE. OAK RIDGE NATL LAB,AUTONOMOUS ROBOT SYST GRP,OAK RIDGE,TN 37831. RP PIN, FG (reprint author), OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,OAK RIDGE,TN 37831, USA. NR 41 TC 22 Z9 22 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 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD FEB PY 1994 VL 10 IS 1 BP 44 EP 54 DI 10.1109/70.285584 PG 11 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA NE806 UT WOS:A1994NE80600005 ER PT J AU RAO, NSV OBLOW, EM GLOVER, CW LIEPINS, GE AF RAO, NSV OBLOW, EM GLOVER, CW LIEPINS, GE TI N-LEARNERS PROBLEM - FUSION OF CONCEPTS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Letter AB Given N learners each capable of learning concepts (subsets) in the sense of Valiant, we are interested in combining them using a single fuser. We consider two cases. In open fusion the fuser is given the sample and the hypotheses of the individual learners; we show that a fusion rule can be obtained by formulating this problem as another learning problem. We show sufficiency conditions that ensure the composite system to be better than the best of the individual. Second, in closed fusion the fuser does not have an access to either the training sample or the hypotheses of the individual learners. By using a linear threshold fusion function (of the outputs of individual learners) we show that the composite system can be made better than the best of the statistically independent learners. RP RAO, NSV (reprint author), OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,OAK RIDGE,TN 37831, USA. OI Rao, Nageswara/0000-0002-3408-5941 NR 31 TC 10 Z9 10 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD FEB PY 1994 VL 24 IS 2 BP 319 EP 327 DI 10.1109/21.281430 PG 9 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA ND334 UT WOS:A1994ND33400013 ER PT J AU FENOUIL, LA TOWLER, GP LYNN, S AF FENOUIL, LA TOWLER, GP LYNN, S TI REMOVAL OF H2S FROM COAL-GAS USING LIMESTONE - KINETIC CONSIDERATIONS SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID CALCIUM-OXIDE; PARTICLES; SULFATION; DIOXIDE; SULFUR AB The calcium carbonate contained in limestone becomes thermodynamically capable of sorbing hydrogen sulfide from high-pressure coal gas at temperatures above 600-degrees-C, typically well below the calcination temperature. Limestone can be used more effectively as a sorbent for hydrogen sulfide in high-temperature gas-cleaning applications if it is prevented from undergoing calcination since calcium oxide may sinter rapidly. For large (millimeter) sized particles typically used in gas cleaning, sintering of uncalcined limestone was found to be insignificant in the temperature range 750-900-degrees-C. Poor conversion of the solid upon reaction with H2S is caused by sintering of the CaS product layer, which can be seen from scanning electron microscopy photographs. Sintering of CaS is rapid in an atmosphere that contains CO2, but is slow under N2 or H-2. The kinetics of CaS sintering under CO2 was determined for the temperature range 750-900-degrees-C. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 21 TC 32 Z9 35 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD FEB PY 1994 VL 33 IS 2 BP 265 EP 272 DI 10.1021/ie00026a014 PG 8 WC Engineering, Chemical SC Engineering GA MX339 UT WOS:A1994MX33900014 ER PT J AU BRAY, M AF BRAY, M TI PRACTICAL ALARM FILTERING SO INTECH LA English DT Article RP BRAY, M (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU INSTRUMENT SOC AMER PI RES TRIANGLE PK PA 67 ALEXANDER DRIVE, RES TRIANGLE PK, NC 27709 SN 0192-303X J9 INTECH JI Intech PD FEB PY 1994 VL 41 IS 2 BP 34 EP 36 PG 3 WC Engineering, Multidisciplinary; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA MY970 UT WOS:A1994MY97000004 ER PT J AU STEVENS, RG GRAUBARD, BI MICOZZI, MS NERIISHI, K BLUMBERG, BS AF STEVENS, RG GRAUBARD, BI MICOZZI, MS NERIISHI, K BLUMBERG, BS TI MODERATE ELEVATION OF BODY IRON LEVEL AND INCREASED RISK OF CANCER OCCURRENCE AND DEATH SO INTERNATIONAL JOURNAL OF CANCER LA English DT Article ID SERUM FERRITIN; STOMACH-CANCER; BLOOD-DONORS; HEMOCHROMATOSIS; PROLIFERATION; DEFICIENCY; MORTALITY; CELLS; MICE; CARCINOGENESIS AB The purpose of the study was to address the hypothesis that elevated body iron increases the risk of cancer occurrence and death, and to determine the dose response. Subjects were 3,287 men and 5,269 women participating in the first National Health and Nutrition Examination Survey who had a transferrin saturation determination at enrollment (1971-1975), who remained alive and cancer-free for at least 4 years, and who were followed to 1988 for cancer outcome. Among 379 men who developed cancer over the study period, the mean transferrin saturation at enrollment was 32.1% whereas among 2,908 who remained cancer-free it was 30.7%; the difference for mortality was 32.3% among 233 deaths vs. 30.8% among 3,054 men not dying of cancer. The mean differences among women were not significant. The mean differences in TIBC and serum iron among men were consistent with the findings for transferrin saturation, and all 3 differences were stable over time when examined by years since blood test. Men and women were divided into 5 groups on the basis of baseline transferrin saturation: 0 to 30%, 30-40%, 40-50%, 50-60%, and 60% and higher. Nineteen percent of men had a baseline transferrin saturation above 40% (the last 3 groups), whereas only 10 percent of women had transferrin saturation above 40%. For men and women combined, risk of cancer occurrence in each group relative to the first was 1.0, 0.95, 1.16, 1.38 and 1.81; for mortality the relative risks were 1.0, 0.96, 1.22, 1.29 and 1.73. There is evidence, in this cohort, of elevated cancer risk in those with moderately elevated iron level. This pattern was seen in women as well as in men. (C) 1994 Wiley-Liss, Inc. C1 NCI, DIV CANC ETIOL, BIOMETRY BRANCH, BETHESDA, MD 20892 USA. NATL MUSEUM HLTH & MED, ARMED FORCES INST PATHOL, WASHINGTON, DC 20306 USA. RADIAT EFFECTS RES FDN, HIROSHIMA, JAPAN. FOX CHASE CANC CTR, PHILADELPHIA, PA USA. UNIV OXFORD BALLIOL COLL, OXFORD OX1 3BJ, ENGLAND. RP STEVENS, RG (reprint author), PACIFIC NW LAB, CTR LIFE SCI, RICHLAND, WA 99352 USA. FU NCI NIH HHS [CA-40737, CA-06927]; NCRR NIH HHS [RR-05895] NR 46 TC 196 Z9 199 U1 1 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7136 J9 INT J CANCER JI Int. J. Cancer PD FEB 1 PY 1994 VL 56 IS 3 BP 364 EP 369 DI 10.1002/ijc.2910560312 PG 6 WC Oncology SC Oncology GA MU556 UT WOS:A1994MU55600011 PM 8314323 ER PT J AU VERRIJK, R HUISKAMP, R BEGG, AC WHEELER, FJ WATKINS, PRD AF VERRIJK, R HUISKAMP, R BEGG, AC WHEELER, FJ WATKINS, PRD TI A COMPREHENSIVE PC-BASED COMPUTER-MODEL FOR MICRODOSIMETRY OF BNCT SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID NEUTRON-CAPTURE THERAPY; RELATIVE BIOLOGICAL EFFECTIVENESS; B-16 MELANOMA-CELLS; B-10(N,ALPHA)LI-7 REACTION; CULTURED-CELLS; LI REACTION; BORON; RADIATION; SKIN; ANTIBODIES AB A computer model is described that performs microdosimetric calculations of the radiation dose delivered to tumour and normal tissue in boron neutron capture therapy (BNCT) by simulating capture reactions in a predefined three-dimensional space. The role of intracellular boron distributions and cellular dimensions on the radiation dose in clinical and experimental BNCT has been studied using a PC-based computer model. In order to calculate the radiation dose to low boron uptake cells, the extent of irradiation by boron containing adjacent cells (cross fire) is also dealt with. Radiation doses from boron and nitrogen neutron capture are converted to a biological effect by means of relative individual ion track segment efficacies, based on linear energy transfer along the particle track. A good correlation was found after comparing predicted values with previously published experimental data. A number of examples is given to illustrate the program's features. C1 NETHERLANDS CANC INST,DIV EXPTL THERAPY,1066 CX AMSTERDAM,NETHERLANDS. NETHERLANDS ENERGY RES FDN,ECN,1755 ZG PETTEN,NETHERLANDS. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. JOINT RES CTR,1755 ZG PETTEN,NETHERLANDS. NR 48 TC 17 Z9 18 U1 1 U2 1 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 FEB PY 1994 VL 65 IS 2 BP 241 EP 253 DI 10.1080/09553009414550271 PG 13 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 NE759 UT WOS:A1994NE75900010 PM 7907121 ER PT J AU SAND, JR FISCHER, SK JONES, JA AF SAND, JR FISCHER, SK JONES, JA TI CARNAHAN-STARLING-DESANTIS AND LEE-KESLER-PLOCKER INTERACTION COEFFICIENTS FOR SEVERAL BINARY-MIXTURES OF OZONE-SAFE REFRIGERANTS SO INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID LA English DT Article DE CFC ALTERNATIVES; BINARY INTERACTION COEFFICIENTS; EQUATIONS OF STATE; OZONE DEPLETION AB Interaction coefficients (ICs) which characterize the non-ideal behaviour of refrigerant mixtures are an important parameters for predicting or modelling the thermodynamic performance of these mixtures in air-conditioning and refrigeration cycles. Experimental data which permit calculation of these parameters for many combinations of the newer, more environmentally acceptable refrigerants are scarce. Saturated vapour pressure data for 70 known mixtures of 8 different refrigerants in 18 binary combinations were analysed to find the interaction coefficients from the best correlation between vapour pressures calculated from the Carnahan-Starling-DeSantis (CSD) and Lee-Kesler-Plocker (LKP) refrigerant property routines and experimental data. Nine of the experimentally measured ICs were not previously given for the CSD routines in the current version of REFPROP(R) from the National Institute of Standards and Technology. Fifteen new LKP ICs are reported. Comparisons are made with both published values and those estimated using algorithms unique to each system of subroutines. Agreement between the ICs reported in this work and published or estimated values is reasonably good in most cases given the simplicity of the test apparatus and experimental procedures. Very good agreement was seen between the ICs calculated in this work and the literature values for R12/R152a, R134a/R134 and R22/F152a, but poor agreement was seen for R22/R142b. Comparisons of published to estimated ICs and reported to estimated ICs suggest that estimation techniques should be improved. C1 JET PROP LAB,PASADENA,CA 91109. RP SAND, JR (reprint author), OAK RIDGE NATL LAB,POB 2008,BLDG 3147,MAIL STOP 6070,OAK RIDGE,TN 37831, USA. NR 17 TC 8 Z9 11 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0140-7007 J9 INT J REFRIG JI Int. J. Refrig.-Rev. Int. Froid PD FEB PY 1994 VL 17 IS 2 BP 123 EP 129 DI 10.1016/0140-7007(94)90053-1 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA ML571 UT WOS:A1994ML57100006 ER PT J AU REISTER, DB PIN, FG AF REISTER, DB PIN, FG TI TIME-OPTIMAL TRAJECTORIES FOR MOBILE ROBOTS WITH 2 INDEPENDENTLY DRIVEN WHEELS SO INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH LA English DT Article ID MANIPULATORS AB This article addresses the problem of time-optimal motions for a mobile platform in a planar environment. The platform has two nonsteerable, independently driven wheels. The overall mission of the robot is expressed in terms of a sequence of via points at which the platform must be at rest in a given configuration (position and orientation). The objective is to plan time-optimal trajectories between these configurations, assuming an unobstructed environment. Using Pontryagin's maximum principle (PMP), we formally demonstrate that all time-optimal motions of the platform for this problem occur for bang-bang controls on the wheels (at each instant, the acceleration on each wheel is at either its upper or its lower limit). The PMP, however provides only the conditions necessary for time optimality. To find the time-optimal robot trajectories we first parameterize the bang-bang trajectories using the switch times on the wheels (the times at which the wheel accelerations change sign). With this param eterization, we can fully search the robot trajectory space and find the switch times that will produce particular paths to a desired final configuration of the platform. We show numerically that robot trajectories with three switch times (two on one wheel and one on the other) can reach any position, while trajectories with four switch times can reach any configuration. By numerical comparison with other trajectories involving similar or greater numbers of switch times, we then identify the sets of time-optimal trajectories. These are uniquely defined using ranges of the parameters and consist of subsets of trajectories with three switch times Vbr the problem when the final orientation of the robot is not specified) or four switch limes (when a full final configuration is specified). We conclude with a description of the use of the method for trajectory planning for one of our robots and discuss some comparisons of sample time-optimal paths with minimum length paths. RP OAK RIDGE NATL LAB, CTR ENGN SYST ADV RES, OAK RIDGE, TN 37831 USA. NR 28 TC 46 Z9 48 U1 0 U2 3 PU SAGE PUBLICATIONS LTD PI LONDON PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND SN 0278-3649 EI 1741-3176 J9 INT J ROBOT RES JI Int. J. Robot. Res. PD FEB PY 1994 VL 13 IS 1 BP 38 EP 54 DI 10.1177/027836499401300103 PG 17 WC Robotics SC Robotics GA MT529 UT WOS:A1994MT52900003 ER PT J AU HANSEN, NR SCHREYER, HL AF HANSEN, NR SCHREYER, HL TI A THERMODYNAMICALLY CONSISTENT FRAMEWORK FOR THEORIES OF ELASTOPLASTICITY COUPLED WITH DAMAGE SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article ID ANISOTROPIC THEORY; MECHANICS; PLASTICITY; CONCRETE; MODEL AB A unified framework for coupled elastoplastic and damage theories is developed. A rigorous thermodynamic procedure is followed that is sufficiently general to include anisotropic plasticity and anisotropic damage formulations. The concept of effective stress is the critical mechanism for coupling these theories, Yield and damage functions, constructed of homogeneous functions of degree one, are shown to satisfy thermodynamic restrictions. The principle of maximum entropy provides the evolutionary relations, the loading and unloading conditions, and the convexity of the undamaging elastic domain. The plastic and damage variables evolve normal to their respective surfaces which for plasticity corresponds to an associative flow for plastic strain. This general framework is shown to be sufficiently general lo encompass several popular theories for plasticity and damage. Limitations of some existing damage theories are discussed. The performance of two specific coupled formulations are illustrated by replicating the experimental behavior of an aluminum alloy. C1 UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131. RP HANSEN, NR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87115, USA. NR 25 TC 206 Z9 213 U1 3 U2 18 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD FEB PY 1994 VL 31 IS 3 BP 359 EP 389 DI 10.1016/0020-7683(94)90112-0 PG 31 WC Mechanics SC Mechanics GA MU750 UT WOS:A1994MU75000006 ER PT J AU JODY, BJ DANIELS, EJ BONSIGNORE, PV BROCKMEIER, NF AF JODY, BJ DANIELS, EJ BONSIGNORE, PV BROCKMEIER, NF TI RECOVERING RECYCLABLE MATERIALS FROM SHREDDER RESIDUE SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Each year, about 11 million tons of metals are recovered in the United States from about 10 million discarded automobiles. The recovered metals account for about 75 percent of the total weight of the discarded vehicles. The balance of the material, known as shredder residue, amounts to about three million tons annually and is currently landfilled. The residue contains a diversity of potentially recyclable materials, including polyurethane foams, iron oxides, and certain thermoplastics. This article discusses a process under development at Argonne National Laboratory to separate and recover the recyclable materials from this waste stream. The process consists essentially of two stages. First, a physical separation is used to recover the foams and the metal oxides, followed by a chemical process to extract certain thermoplastics. The status of the technology and the process economics are reviewed here. RP JODY, BJ (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439, USA. NR 17 TC 10 Z9 10 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 FEB PY 1994 VL 46 IS 2 BP 40 EP 43 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA MW273 UT WOS:A1994MW27300006 ER PT J AU BHATTACHARYA, T BILLOIRE, A LACAZE, R JOLICOEUR, T AF BHATTACHARYA, T BILLOIRE, A LACAZE, R JOLICOEUR, T TI CRITICAL-BEHAVIOR OF THE ANTIFERROMAGNETIC HEISENBERG-MODEL ON A STACKED TRIANGULAR LATTICE SO JOURNAL DE PHYSIQUE I LA English DT Note ID PHASE-TRANSITIONS; MONTE-CARLO; SYSTEMS; XY AB We estimate, using a large-scale Monte Carlo simulation, the critical exponents of the antiferromagnetic Heisenberg model on a stacked triangular lattice. We obtain the following estimates: gamma/upsilon = 2.011 +/- 0.014, upsilon = 0.585 +/- 0.009. These results contradict a perturbative 2 + epsilon Renormalization Group calculation that points to Wilson-Fisher O(4) behaviour. While these results may be coherent with 4 - epsilon results from Landau-Ginzburg analysis, they show the existence of an unexpectedly rich structure of the Renormalization Group how as a function of the dimensionality and the number of components of the order parameter. C1 CEA,DIRECT SCI MATIERE LAB,SERV PHYS THEOR SACLAY,F-91191 GIF SUR YVETTE,FRANCE. RP BHATTACHARYA, T (reprint author), LOS ALAMOS NATL LAB,GRP T-8,MS B285,LOS ALAMOS,NM 87544, USA. RI Bhattacharya, Tanmoy/J-8956-2013 OI Bhattacharya, Tanmoy/0000-0002-1060-652X NR 19 TC 23 Z9 23 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4304 J9 J PHYS I JI J. Phys. I PD FEB PY 1994 VL 4 IS 2 BP 181 EP 186 PG 6 WC Physics, Multidisciplinary SC Physics GA MV011 UT WOS:A1994MV01100003 ER PT J AU NORTON, LJ KRAMER, EJ JONES, RAL BATES, FS BROWN, HR FELCHER, GP KLEB, R AF NORTON, LJ KRAMER, EJ JONES, RAL BATES, FS BROWN, HR FELCHER, GP KLEB, R TI RESONANTLY ENHANCED NEUTRON INTENSITY IN A SURFACE SEGREGATED POLYMER BLEND SO JOURNAL DE PHYSIQUE II LA English DT Article ID REFLECTIVITY; PROFILES; LAYERS AB We have formed a resonant cavity for a massive particle, the neutron, in an attractive potential between a surface segregated polymer film and its substrate. Standing waves occur when incident waves interfere with the waves reflected from the substrate. Multiple internal reflections lead to an enhanced intensity at resonant wave vectors below the wave vector for total reflection. At these resonant wave vectors the enhanced neutron intensity incoherently scatters from the hydrogen containing polymer of the potential well causing a marked decrease in the reflectivity. The position of the resonant dips provides an aid to fitting the reflectivity data by restricting the possible scattering length density profiles. This phenomena may find application in the study of in-plane correlations by enhancing off-specular scattering. C1 CORNELL UNIV,CTR MAT SCI,ITHACA,NY 14853. CAVENDISH LAB,CAMBRIDGE CB3 0HE,CAMBS,ENGLAND. UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455. IBM CORP,ARC,SAN JOSE,CA 95120. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP NORTON, LJ (reprint author), CORNELL UNIV,DEPT MAT SCI & ENGN,ITHACA,NY 14853, USA. NR 26 TC 18 Z9 18 U1 0 U2 2 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4312 J9 J PHYS II JI J. Phys. II PD FEB PY 1994 VL 4 IS 2 BP 367 EP 376 PG 10 WC Mechanics; Physics, Atomic, Molecular & Chemical SC Mechanics; Physics GA MV817 UT WOS:A1994MV81700013 ER PT J AU DOMINGUEZRODRIGUEZ, A JIMENEZMELENDO, M CHEN, N GORETTA, KC ROTHMAN, SJ ROUTBORT, JL AF DOMINGUEZRODRIGUEZ, A JIMENEZMELENDO, M CHEN, N GORETTA, KC ROTHMAN, SJ ROUTBORT, JL TI CREEP AND DIFFUSION IN HIGH-T(C) SUPERCONDUCTORS SO JOURNAL DE PHYSIQUE III LA English DT Article ID TRACER DIFFUSION; COMPRESSIVE CREEP; SINGLE-CRYSTALS; YBA2CU3O7-DELTA; OXYGEN; BI2SR2CACU2OX; DEFORMATION AB Data from steady-state creep and tracer diffusion tests are presented for the high-T(c) superconductors YBa2Cu3Ox and Bi2Sr1.7CaCu2Oy. Both compounds exhibit oxygen nonstoichiometry and possess orthorhombic, layered perovskite crystal structures in which Cu occupies the B sites and the other cations occupy the A sites. For each, the A-site cations diffuse most slowly. For every species that has been measured, diffusion is much faster in the ab-plane than in the c-direction. At low stresses, both superconductors deform by diffusional creep with the rate-controlling species being a A-site cation in YBa2Cu3Ox. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP DOMINGUEZRODRIGUEZ, A (reprint author), UNIV SEVILLE,DEPT FIS MAT CONDENSADA,SEVILLE,SPAIN. NR 18 TC 7 Z9 7 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4320 J9 J PHYS III JI J. Phys. III PD FEB PY 1994 VL 4 IS 2 BP 253 EP 260 PG 8 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Fluids & Plasmas SC Materials Science; Physics GA MY021 UT WOS:A1994MY02100004 ER PT J AU BAMBERGER, CE HAVERLOCK, TJ SHOUP, SS KOPP, OC STUMP, NA AF BAMBERGER, CE HAVERLOCK, TJ SHOUP, SS KOPP, OC STUMP, NA TI COMPOUNDS OF CERIUM, TITANIUM AND OXYGEN SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID SOLID-SOLUTIONS AB The solubility of Ce2Ti2O7 in Ln2Ti2O7 (Ln = Gd, Er and Lu) was determined experimentally. It was found that the solubility increases as the ionic radius of the host lanthanide element decreases. The lattice parameters of Ce2O3.4TiO2 have been measured. The solubility of TiO2-m in Ce2O3.3TiO2-m (m almost-equal-to 0.11) was determined and the resulting solutions were investigated; the results indicate that an additional 2.5 TiO2-m can be dissolved without significantly changing the lattice parameters. Limits for the solubility of Ce4+ in compounds such as Ce2O3.nTiO2 in which n = 2 or 4 were also estimated. C1 UNIV TENNESSEE,ORNL,DIV MET & CERAM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT GEOL SCI,KNOXVILLE,TN 37996. RP BAMBERGER, CE (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 23 TC 20 Z9 20 U1 2 U2 12 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 FEB PY 1994 VL 204 IS 1-2 BP 101 EP 107 DI 10.1016/0925-8388(94)90078-7 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NB569 UT WOS:A1994NB56900024 ER PT J AU MACKAY, R MILLER, GJ FRANZEN, HF AF MACKAY, R MILLER, GJ FRANZEN, HF TI NEW OXIDES OF THE FILLED-TI2NI TYPE-STRUCTURE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article AB The metal atom ordering and oxygen occupancy of four compounds of the filled-Ti2Ni type structure have been determined by single-crystal X-ray diffraction studies. Three additional phases have been identified and indexed from powder X-ray diffraction data. All the phases crystallize in space group Fd3mBAR with the following compositions: Zr4Ni2O (a = 12.1970(9) angstrom), Zr6Ni4Ti2O0.6 (a = 12.0299(9) angstrom), Nb6Ni6O (a = 11.2117(5) angstrom), and Nb6Ni4Ta2O2 (a = 11.5813(3) angstrom). Phases identified using powder data are Nb4Ni2O (a = 11.5933(3) angstrom), Zr4Cu2O (a = 12.2659(7) angstrom), and Zr6Co4Ti2O (a=11.8649(9) angstrom). A comparison of the structures and oxygen occupancies is presented, as well as tentative explanations based on results of extended Huckel calculations. The role of interstitial oxygen as an electron acceptor and its effect on metal-metal bonding are considered. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP MACKAY, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 36 TC 42 Z9 43 U1 0 U2 16 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 FEB PY 1994 VL 204 IS 1-2 BP 109 EP 118 DI 10.1016/0925-8388(94)90079-5 PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NB569 UT WOS:A1994NB56900025 ER PT J AU MARKING, GA FRANZEN, HF AF MARKING, GA FRANZEN, HF TI ZRNBP AND HFNBP, NEW PHASES WITH THE CO2SI STRUCTURE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Letter ID POWDER DIFFRACTION PHOTOGRAPHS; DENSITOMETER C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP MARKING, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 17 TC 13 Z9 13 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 FEB PY 1994 VL 204 IS 1-2 BP L17 EP L20 DI 10.1016/0925-8388(94)90059-0 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NB569 UT WOS:A1994NB56900005 ER PT J AU SCHEWEMILLER, IM LI, F COLUMBIA, M SCHRADER, GL FRANZEN, HF AF SCHEWEMILLER, IM LI, F COLUMBIA, M SCHRADER, GL FRANZEN, HF TI CRYSTALLIZATION OF PBMO6S8 IN AMORPHOUS THIN-FILMS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Letter ID CHEVREL PHASE-COMPOUNDS; MOLYBDENUM SULFIDES; HYDRODESULFURIZATION C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP SCHEWEMILLER, IM (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 13 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 FEB PY 1994 VL 204 IS 1-2 BP L13 EP L15 DI 10.1016/0925-8388(94)90058-2 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NB569 UT WOS:A1994NB56900004 ER PT J AU BARSHICK, CM SMITH, DH WADE, JW BAYNE, CK AF BARSHICK, CM SMITH, DH WADE, JW BAYNE, CK TI ISOTOPE-DILUTION GLOW-DISCHARGE MASS-SPECTROMETRY AS APPLIED TO THE ANALYSIS OF LEAD IN WASTE OIL SAMPLES SO JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY LA English DT Article DE GLOW DISCHARGE MASS SPECTROMETRY; SOLUTION RESIDUE ANALYSIS; ISOTOPE DILUTION; INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY AB The application of isotope dilution (ID) to glow discharge mass spectrometry (GDMS) has been evaluated. Initial work with the analysis of solution residues has been modified to accommodate introduction of an isotopic spike. In evaluating ID-GDMS, elemental lead concentrations were determined in oil leachate samples. After equilibration of the sample and spike, a few hundred microliter volume of solution was mixed with a conducting host matrix. This slurry was then dried, homogenized and pressed into a GD cathode; after electrode formation, routine GDMS analysis (isotopic) was performed. Internal precision (within sample variation) was estimated to be better than 5% relative standard deviation (RSD) (1sigma) through the use of a computer model of the ID equation. External precision (between-sample variation) was better than 2% RSD (1sigma), a substantial improvement over most conventional GDMS analyses. For comparison purposes (i.e., where multiple isotopic spikes are impractical), a calibration curve was applied to the same data and gave external precision of better than 15% RSD. Both calibration curve and ID results compare well with those obtained by inductively coupled plasma atomic emission spectrometry. C1 OAK RIDGE NATL LAB,DIV COMP & TELECOMMUN,OAK RIDGE,TN 37831. RP BARSHICK, CM (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 17 TC 10 Z9 11 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0267-9477 J9 J ANAL ATOM SPECTROM JI J. Anal. At. Spectrom. PD FEB PY 1994 VL 9 IS 2 BP 83 EP 87 DI 10.1039/ja9940900083 PG 5 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA NB132 UT WOS:A1994NB13200006 ER PT J AU VITT, JE JOHNSON, DC AF VITT, JE JOHNSON, DC TI OXIDATION OF IODIDE TO IODATE CONCURRENTLY WITH EVOLUTION OF OXYGEN AT KELGRAF COMPOSITE ELECTRODES SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article ID BETA-LEAD DIOXIDE; LIQUID-CHROMATOGRAPHY; ELECTROCHEMICAL DETECTION; CARBAMATE PESTICIDES; ELECTROCATALYSIS; VOLTAMMETRY; HCIO4; WATER AB The oxidation of I- to IO3- in acidic media occurs at numerous electrode materials at potential values corresponding to the anodic discharge of H2O With simultaneous evolution of oxygen. In the study reported here the anodic current density for IO3- production was measured by difference voltammetry at rotated disc electrodes (r.d.e.'s) constucted from pure glassy carbon (GC) and Kelgraf (graphite plus Kel-F) composite materials. These signal values (S) were normalized relative to the background current (B) for oxygen evolution measured at 1.75 V vs SCE, a potential corresponding to the transport-limited production of IO3- at GC. Despite a small positive shift in E1/2 with decreasing fractional active area, the signal-to-background ratio (S/B) at the Kelgraf electrodes was enhanced relative to that for the GC electrode. For example, S/B at a 2% Kelgraf r.d.e. was nine times larger than at a GC r.d.e. This corresponds to an increase in current efficiency (S/(S + B)) for IO3- production from about 50% at the GC r.d.e. to about 90% at 2% Kelgraf r.d.e. This is explained on the basis of (i) a significant decrease in total background current as a result of the decreased fraction of the Kelgraf surface that corresponds to carbon, and (ii) a larger flux density of I- at the carbon microelectrodes in the Kelgraf r.d.e., as compared to the GC r.d.e., as a result of radial diffusion, i.e. the so-called 'edge effect'. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP VITT, JE (reprint author), UNIV S DAKOTA,DEPT CHEM,VERMILLION,SD 57069, USA. NR 27 TC 7 Z9 7 U1 0 U2 5 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD FEB PY 1994 VL 24 IS 2 BP 107 EP 113 PG 7 WC Electrochemistry SC Electrochemistry GA MW003 UT WOS:A1994MW00300002 ER PT J AU GRANSTAFF, VE MARTIN, SJ AF GRANSTAFF, VE MARTIN, SJ TI CHARACTERIZATION OF A THICKNESS-SHEAR MODE QUARTZ RESONATOR WITH MULTIPLE NONPIEZOELECTRIC LAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CRYSTAL MICROBALANCE; MASS SENSITIVITY; LIQUID; DEPOSITION; ELECTRODES AB This paper describes a one-dimensional analysis of a piezoelectric resonator with multiple nonpiezoelectric layers of arbitrary thickness and complex shear modulus. This analysis shows under what conditions the simple Butterworth-Van Dyke (BVD) lumped-element equivalent circuit can be used to extract the properties of these layers, and provides a theoretical basis for doing so under these conditions, The method presented here is based on the physics of wave propagation, but uses transmission line techniques to transform the equations and boundary conditions into a simple string of 2 X 2 matrix multiplications, which easily accommodate any number of layers. An analysis of the AT-cut quartz/polymer/liquid composite resonator is presented in detail because of its importance in sensor and electrochemical quartz crystal microbalance applications. The analysis shows that adding the polymer and liquid impedances in the motional arm of a BVD circuit is not valid near the polymer film resonance, but is appropriate for a thin, rigid polymer film in contact with a liquid. RP GRANSTAFF, VE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 32 TC 181 Z9 181 U1 2 U2 28 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 FEB 1 PY 1994 VL 75 IS 3 BP 1319 EP 1329 DI 10.1063/1.356410 PG 11 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200010 ER PT J AU PARISE, JB YEGANEHHAERI, A WEIDNER, DJ JORGENSEN, JD SALTZBERG, MA AF PARISE, JB YEGANEHHAERI, A WEIDNER, DJ JORGENSEN, JD SALTZBERG, MA TI PRESSURE-INDUCED PHASE-TRANSITION AND PRESSURE-DEPENDENCE OF CRYSTAL-STRUCTURE IN LOW (ALPHA) AND CA/AL-DOPED CRISTOBALITE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BETA-CRISTOBALITE; TEMPERATURE; SIO2; DIFFRACTION; BEHAVIOR AB The phase stability and atomic-level compression mechanisms for both SiO2 cristobalite, and for cristobalite partially stabilized by Ca/Al doping (Ca-x/2 Si2-xAlxO4), have been investigated. A phase transition to a lower symmetry phase, observed with in situ high-pressure energy-dispersive x-ray diffraction, occurs at about 1.2 GPa. Structure models of the low-pressure phase were obtained by Rietveld analysis of neutron powder-diffraction data from powdered samples contained in a gas pressure apparatus. These data were collected at pressures up to 0.6 GPa and at 298 and 60 K. The results suggest collapse of the corner-connected framework from rotations of the rigid SiO4 tetrahedra at high pressures and low temperatures as the dominant mechanism for the densification of both materials. Compared to pure SiO2 cristobalite at the same pressure and temperature, the Ca/Al-doped material has a larger unit-cell volume. It also has a larger Si-O-Si bending angle and a more expanded framework as evidenced by the smaller rotations of the rigid SiO4 tetrahedra. The rate of change of these parameters as a function of pressure and temperature is the same for both pure and Ca/Al-doped cristobalite. These observations are consistent with Ca occupying positions within the cavities formed by the (Si, Al)-O framework and bracing it against collapse. C1 SUNY STONY BROOK,DEPT EARTH & SPACE SCI,STONY BROOK,NY 11794. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. DUPONT CO INC,CENT RES & DEV,WILMINGTON,DE 19880. RP PARISE, JB (reprint author), SUNY STONY BROOK,CHIPR,STONY BROOK,NY 11794, USA. NR 23 TC 36 Z9 36 U1 1 U2 14 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 FEB 1 PY 1994 VL 75 IS 3 BP 1361 EP 1367 DI 10.1063/1.356415 PG 7 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200015 ER PT J AU YU, KM AGER, JW BOURRET, ED WALKER, J WALUKIEWICZ, W AF YU, KM AGER, JW BOURRET, ED WALKER, J WALUKIEWICZ, W TI HIGH-DOSE CL IMPLANTATION IN ZNSE - IMPURITY INCORPORATION AND RADIATION-DAMAGE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; ELECTRICAL-ACTIVITY; ION-IMPLANTATION; GROWTH; LAYERS; MOCVD; GAAS AB The structural characteristics of ZnSe thin films grown by organometallic vapor phase epitaxy and implanted heavily with Cl ions (5X10(15) and 1X10(16)/cm(2)) were investigated using ion beam techniques, x-ray diffraction, and Raman spectroscopy. We have found that although the as-implanted ZnSe layers were severely damaged, no amorphous layer was formed with an implant dose as high as 1X10(16) Cl ions/cm(2). Crystalline damage in the ZnSe layers was not fully removed even after annealing at 700 degrees C for 10 s. Ion channeling reveals that after annealing over 50% of the Cl atoms sit substitutionally in the lattice and they are preferentially located in the Se site. However, a significant fraction of the substitutional Cl are found to be slightly displaced from the normal Se sites. The projected displacement was found to be approximate to 0.2 Angstrom. Electrical measurements and Raman spectroscopy results suggest that a large concentration of Zn vacancies (V-Zn) are present in the annealed samples. We believe that the Cl displacement and the low conductivity in these samples are due to the formation of (Cl-Se - V-Zn) complexes. RP YU, KM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012; OI Yu, Kin Man/0000-0003-1350-9642; Ager, Joel/0000-0001-9334-9751 NR 30 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 1994 VL 75 IS 3 BP 1378 EP 1383 DI 10.1063/1.356417 PG 6 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200018 ER PT J AU SHANNON, MA RUBINSKY, B RUSSO, RE AF SHANNON, MA RUBINSKY, B RUSSO, RE TI DETECTING LASER-INDUCED PHASE-CHANGE AT THE SURFACE OF SOLIDS VIA LATENT-HEAT OF MELTING WITH A PHOTOTHERMAL DEFLECTION TECHNIQUE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BEAM DEFLECTION; SPECTROSCOPY AB The detection of laser-induced melt at the surface of a solid in real time is demonstrated using a photothermal deflection (PTD) technique. Experimental results for indium and tin show that a local maximum and minimum pair can occur in the temporal profile of the PTD signal when melt occurs. A local minimum does not occur without phase change. Analytical work is presented which explicitly shows the effect of the latent heat of melting, thermal properties, and probe-beam size and offset on the shape of a PTD signal. Results are presented which demonstrate that the observed change in shape will not occur with planar heating, with or without phase transition. However, results derived for point-source heating show that it is possible for the maximum/minimum pair to occur when melting with a focused laser beam. The ratio of the sensible heat to the latent heat, and the ratio of the thermal diffusivities of the target and deflecting medium are the key factors which govern the deflection response. Computations for a general class of materials are given to show when the effect of latent heat can be observed at a surface. Results are also given which consider the probe-beam size and offset on the observations. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Rubinsky, Boris/B-4439-2010 OI Rubinsky, Boris/0000-0002-2794-1543 NR 20 TC 12 Z9 12 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 1994 VL 75 IS 3 BP 1473 EP 1485 DI 10.1063/1.356382 PG 13 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200032 ER PT J AU SIEGAL, MF MARTINEZMIRANDA, LJ SANTIAGOAVILES, JJ GRAHAM, WR SIEGAL, MP AF SIEGAL, MF MARTINEZMIRANDA, LJ SANTIAGOAVILES, JJ GRAHAM, WR SIEGAL, MP TI A STUDY OF STRAIN IN THIN EPITAXIAL-FILMS OF YTTRIUM SILICIDE ON SI(111) SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SCHOTTKY-BARRIER HEIGHT; 111 SILICON; GROWTH AB We present the results of an x-ray diffraction analysis of epitaxial yttrium silicide films grown on Si(111), with thicknesses ranging from 14 to 100 Angstrom A. The macroscopic strain along the out-of-plane direction for films containing pits or pinholes follows the trend observed previously in films of thicknesses up to 510 Angstrom A. The out-of-plane lattice parameter decreases linearly with film thickness. We show preliminary evidence that pinhole-free films do not follow the above trend, and that strain in these films has the opposite sign than in films with pinholes. Finally, our results also indicate that the mode of growth, coupled to the interfacial thermal properties of the films, affects the observed value for the strain in the films. C1 UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. UNIV PENN,DEPT ELECT ENGN,PHILADELPHIA,PA 19104. SANDIA NATL LABS,ALBUQUERQUE,NM 87111. NR 11 TC 9 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 1994 VL 75 IS 3 BP 1517 EP 1520 DI 10.1063/1.356387 PG 4 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200037 ER PT J AU NELSON, AJ FRIGO, SP ROSENBERG, RA AF NELSON, AJ FRIGO, SP ROSENBERG, RA TI CHEMISTRY AND ELECTRONIC-STRUCTURE OF THE H-2 PLASMA PASSIVATED SURFACE OF CDTE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CYCLOTRON RESONANCE DISCHARGES; HYDROGEN PASSIVATION; III-V; PHOTOLUMINESCENCE; PHOTOEMISSION; SEMICONDUCTORS; ACCEPTOR; STATES AB The effects of low energy H-2 plasma exposure on the surface defect chemistry and the electronic structure of CdTe were studied by synchrotron radiation soft x-ray photoemission spectroscopy and optical emission spectroscopy as a function of substrate temperature. The low energy H-2 plasma was generated with a commercial electron cyclotron resonance plasma source using pure H-2 with the plasma exposure being performed at ambient temperature, 100 degrees C, and 200 degrees C. Plasma species were identified with optical emission spectroscopy. In situ photoemission measurements were acquired after each plasma exposure in order to observe changes in the valence band electronic structure as well as changes in the Cd 4d and Te 4d core lines. The results were correlated in order to relate the plasma species and characteristics to changes in surface defect chemistry and electronic structure. These measurements indicate that the H-2 plasma exposure type converts the CdTe(100) surface from p- to n-type and passivates defect states. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Rosenberg, Richard/K-3442-2012 NR 20 TC 5 Z9 5 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 FEB 1 PY 1994 VL 75 IS 3 BP 1632 EP 1637 DI 10.1063/1.356376 PG 6 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200055 ER PT J AU GRUEN, DM LIU, SZ KRAUSS, AR PAN, XZ AF GRUEN, DM LIU, SZ KRAUSS, AR PAN, XZ TI BUCKYBALL MICROWAVE PLASMAS - FRAGMENTATION AND DIAMOND-FILM GROWTH SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CARBON CLUSTER IONS; UNIMOLECULAR DECAY; COVALENT CLUSTERS; SMALL PARTICLES; GAS-PHASE; C60; EVAPORATION; IONIZATION; EMISSION; C-60 AB Microwave discharges (2.45 GHz) have been generated in C-60-containing Ar. The gas mixtures were produced by flowing Ar over fullerene-containing soot at a variety of temperatures. Optical spectroscopy shows that the spectrum is dominated by the d(3) Pi(g)-a (3) Pi(u) Swan bands of C-2 and particularly the Delta v = -2, -1, 0, +1, and +2 sequences. These results give direct evidence that C-2 is in fact one of the products of C-60 fragmentation brought about, at least in part, by collisionally induced dissociation. C-60 has been used as a precursor in a plasma-enhanced chemical vapor deposition experiment to grow diamond-thin films. The films, grown in an Ar/H-2 gas mixture (0.14% carbon content, 100 Torr, 20 seem Ar, 4 seem H-2, 1500 W, 850 degrees C substrate temperature) were characterized with scanning electron microscopy, x-ray diffraction, and Raman spectroscopy. The growth rate was found to be similar to 0.6 mu m/h. Assuming a linear dependence on carbon concentration, a growth rate at least six times higher than commonly observed using methane as a precursor would be predicted at a carbon content of 1% based on C-60. Energetic and mechanistic arguments are advanced to rationalize this result based on C-2 as the growth species. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP GRUEN, DM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 59 TC 140 Z9 144 U1 5 U2 30 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 FEB 1 PY 1994 VL 75 IS 3 BP 1758 EP 1763 DI 10.1063/1.356367 PG 6 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200074 ER PT J AU KURZEJA, RJ AF KURZEJA, RJ TI COMPARISON OF A DOPPLER SODAR WITH BIVANES AND CUP ANEMOMETERS SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Note AB A commercial Doppler sodar was operated near a 300-m tower instrumented with bivanes and cup anemometers. Sodar measurements of wind speed and direction and a turbulence variable (sigma(w)) were compared with tower measurements at 90, 180, and 300 m. A total of 2084 15-min periods of data were compared during one year. The bias and precision of the sodar data were calculated with respect to the bivanes and anemometers. It was found that, with the exception of the azimuth bias, the sodar measurements exhibited a somewhat greater bias and higher (worse) precision than found in previous studies. The azimuth bias of the sodar with respect to the bivanes was much less than reported in previous studies. Reasons for the differences between the sodar and the tower instruments are discussed. Inspection of tower and sodar data indicated that with experience the sodar data could be quality assured reasonably well without the need for direct comparison with a tower. The study underscores the value of manual data inspection at a new installation to assess the effects of the local environment on the data quality. RP KURZEJA, RJ (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,SAVANNAH RIVER TECHNOL CTR,BLDG 773-A,AIKEN,SC 29808, USA. NR 0 TC 4 Z9 4 U1 1 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD FEB PY 1994 VL 11 IS 1 BP 192 EP 199 DI 10.1175/1520-0426(1994)011<0192:COADSW>2.0.CO;2 PN 2 PG 8 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA MV461 UT WOS:A1994MV46100010 ER PT J AU BARTON, RC SCHERER, S AF BARTON, RC SCHERER, S TI INDUCED CHROMOSOME REARRANGEMENTS AND MORPHOLOGIC VARIATION IN CANDIDA-ALBICANS SO JOURNAL OF BACTERIOLOGY LA English DT Article ID WHITE-OPAQUE TRANSITION; ELECTROPHORETIC KARYOTYPES; COLONY MORPHOLOGY; GENE DISRUPTION; YEAST; MUTANTS; STELLATOIDEA AB We have isolated a mutant of Candida albicans that switches between colony morphologies at high frequencies in a strain with several genetic markers. This strain, 1183, has an altered karyotype with two extra chromosomes. The 1183 karyotype is unstable upon passage. Using DNA transformation with the URA3 gene flanked by sequences from the C. albicans repeat sequence 27A, we have marked individual chromosomes of 1183 and 1161, a related smooth, stable strain. Many transformants contained one or more extra chromosomes, ranging in size from 150 kb to 2.1 Mb. Most were less than 800 kb and appeared to be fragments of a single chromosome. All fragments tested derive from one of the two smallest chromosomes. Six of 13 fragments contained the URA3 gene. In some cases, URA3 was located at the end of a fragment,vith adjacent telomere repeats. The integrated copy of URA3 was unstable in some 1183 transformants. Our results suggest that 1183 has a mutation affecting genomic stability. A connection between karyotypic changes and morphologic variation has been suggested from studies of several C. albicans strains; however, we find that gross karyotypic and morphological changes are separable processes. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, CTR HUMAN GENOME, BERKELEY, CA 94720 USA. FU NIAID NIH HHS [AI23850] NR 33 TC 31 Z9 32 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0021-9193 EI 1098-5530 J9 J BACTERIOL JI J. Bacteriol. PD FEB PY 1994 VL 176 IS 3 BP 756 EP 763 PG 8 WC Microbiology SC Microbiology GA MU151 UT WOS:A1994MU15100025 PM 8300529 ER PT J AU MUROPASTOR, AM KURITZ, T FLORES, E HERRERO, A WOLK, CP AF MUROPASTOR, AM KURITZ, T FLORES, E HERRERO, A WOLK, CP TI TRANSFER OF A GENETIC-MARKER FROM A MEGAPLASMID OF ANABAENA SP STRAIN PCC-7120 TO A MEGAPLASMID OF A DIFFERENT ANABAENA STRAIN SO JOURNAL OF BACTERIOLOGY LA English DT Article ID FILAMENTOUS CYANOBACTERIA; GEL-ELECTROPHORESIS; NUCLEOTIDE-SEQUENCE; PLASMID PDU1; IDENTIFICATION; PCC-7120; REPLICATION; NUCLEASE; REGION; M-131 AB The 410-kb alpha megaplasmid of the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 was found to bear the nucA gene that encodes a sugar-nonspecific nuclease. That gene was mutated by insertion of a cassette that confers resistance to neomycin. The resulting strain, AMP2, was mated with a streptomycin-resistant derivative of Anabaena sp. strain PCC 7118, a strain that does not form heterocysts. Cells resistant to both neomycin and streptomycin that were derived from such matings were found to bear the neomycin resistance cassette of the donor strain in a larger megaplasmid characteristic of the recipient strain and did not form heterocysts. This is the first example of transfer of a genetic marker directly between strains of cyanobacteria in which incontrovertible physical evidence of transfer has been obtained. DNA sequences homologous to the nucA gene were present in 13 heterocyst-forming cyanobacteria that were tested but in none of six diverse unicellular strains that were examined. C1 UNIV SEVILLA,CSIC,FAC BIOL,INST BIOQUIM VEGETAL & FOTOSINTESIS,E-41080 SEVILLE,SPAIN. MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,CTR MICROBIAL ECOL,E LANSING,MI 48824. RI Muro-Pastor, Alicia/A-4445-2015; Herrero, Antonia/B-7246-2015; Flores, Enrique/L-2007-2014 OI Muro-Pastor, Alicia/0000-0003-2503-6336; Herrero, Antonia/0000-0003-1071-6590; Flores, Enrique/0000-0001-7605-7343 NR 31 TC 27 Z9 29 U1 0 U2 0 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 FEB PY 1994 VL 176 IS 4 BP 1093 EP 1098 PG 6 WC Microbiology SC Microbiology GA MX267 UT WOS:A1994MX26700020 PM 8106321 ER PT J AU ERMLER, U MICHEL, H SCHIFFER, M AF ERMLER, U MICHEL, H SCHIFFER, M TI STRUCTURE AND FUNCTION OF THE PHOTOSYNTHETIC REACTION-CENTER FROM RHODOBACTER-SPHAEROIDES SO JOURNAL OF BIOENERGETICS AND BIOMEMBRANES LA English DT Article DE PHOTOSYNTHETIC REACTION CENTER; RHODOBACTER-SPHAEROIDES; X-RAY CRYSTALLOGRAPHY; PROTEIN STRUCTURE; MEMBRANE PROTEIN ELECTRON TRANSPORT; PROTON TRANSPORT ID BACTERIUM RHODOPSEUDOMONAS-VIRIDIS; AMINO-ACID SEQUENCE; SITE-DIRECTED MUTANTS; X-RAY-DIFFRACTION; ELECTRON-TRANSFER; L-SUBUNIT; CHLOROFLEXUS-AURANTIACUS; MACROMOLECULAR STRUCTURES; PROTEIN SUBUNITS; PROTON-TRANSFER AB The three-dimensional structure of the photosynthetic reaction center from Rhodobacter sphaeroides is described. The reaction center is a transmembrane protein that converts light into chemical energy. The protein has three subunits: L, M, and H. The mostly helical L and M subunits provide the scaffolding and the finely tuned environment in which the chromophores carry out electron transfer. The details of the protein-chromophore interactions are from studies of a trigonal crystal form that diffracted to 2.65-angstrom resolution. Functional studies of the multi-subunit complex by site-specific replacement of key amino acid residues are summarized in the context of the molecular structure. C1 ARGONNE NATL LAB,CTR MECHAN BIOL & BIOTECHNOL,ARGONNE,IL 60439. RP ERMLER, U (reprint author), MAX PLANCK INST BIOPHYS,MOLEK MEMBRANBIOL ABT,HEINRICH HOFFMANN STR 7,W-6000 FRANKFURT 71,GERMANY. FU NIGMS NIH HHS [GM36598] NR 57 TC 70 Z9 71 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0145-479X J9 J BIOENERG BIOMEMBR JI J. Bioenerg. Biomembr. PD FEB PY 1994 VL 26 IS 1 BP 5 EP 15 DI 10.1007/BF00763216 PG 11 WC Biophysics; Cell Biology SC Biophysics; Cell Biology GA NB987 UT WOS:A1994NB98700002 PM 8027023 ER PT J AU WRAY, WO BEST, ED CHENG, LY AF WRAY, WO BEST, ED CHENG, LY TI A MECHANICAL MODEL FOR RADIAL KERATOTOMY - TOWARD A PREDICTIVE CAPABILITY SO JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB A detailed three-dimensional finite element model for radial keratotomy has been developed. The model includes the full load-bearing tunic of the eye and employs realistic geometry. Incisions are modeled explicitly, and material parameters are obtained from in vivo data. Calculated results obtained with the model are compared with data from two independent medical studies on radial keratotomy. C1 FAILURE ANAL ASSOC INC,MENLO PK,CA 94025. RP WRAY, WO (reprint author), LOS ALAMOS NATL LAB,ADV ENGN TECHNOL,MEE 13 GRP,LOS ALAMOS,NM 87545, USA. NR 18 TC 13 Z9 13 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0148-0731 J9 J BIOMECH ENG-T ASME JI J. Biomech. Eng.-Trans. ASME PD FEB PY 1994 VL 116 IS 1 BP 56 EP 61 DI 10.1115/1.2895705 PG 6 WC Biophysics; Engineering, Biomedical SC Biophysics; Engineering GA MZ750 UT WOS:A1994MZ75000008 PM 8189715 ER PT J AU CHANDRASEKARAN, R RADHA, A RATLIFF, RL AF CHANDRASEKARAN, R RADHA, A RATLIFF, RL TI SEQUENCE-DEPENDENT CONFORMATIONAL VARIATIONS IN THE B-DNA DOUBLE-HELIX OF POLY-D(AATT)CENTER-DOT-POLY-D(AATT) SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID CRYSTAL-STRUCTURE; MINOR-GROOVE; C-G; DODECAMER; RECOGNITION; RESOLUTION; COMPLEX; BINDING; HOECHST-33258; REFINEMENT AB X-ray diffraction data from well oriented and polycrystalline fibers of the lithium salt of poly d(AATT).poly d(AATT? are isomorphous with those from B-DNA. The double-helix consists of conformationally identical antiparallel strands and the molecular symmetry is 2 5(2); the asymmetric unit is a tetranucleotide, AATT, and 5 tetranucleotides span two turns per strand. Two double helices pass through a monoclinic unit cell of dimensions a = 31.05, b = 22.62, c = 33.85 Angstrom (fiber axis) and gamma = 90 degrees. In each repeating motif, the four nucleotides have distinct conformations, TpA displays an axial P-O bond and there is shortening of minor groove in the central region. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,GENET GRP,LOS ALAMOS,NM 87545. RP CHANDRASEKARAN, R (reprint author), PURDUE UNIV,WHISTLER CTR CARBOHYDRATE RES,SMITH HALL,W LAFAYETTE,IN 47907, USA. NR 38 TC 10 Z9 10 U1 0 U2 0 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD FEB PY 1994 VL 11 IS 4 BP 741 EP 766 PG 26 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA MZ784 UT WOS:A1994MZ78400004 PM 8204212 ER PT J AU SRINIVASAN, S DATYE, AK SMITH, MH PEDEN, CHF AF SRINIVASAN, S DATYE, AK SMITH, MH PEDEN, CHF TI INTERACTION OF TITANIUM ISOPROPOXIDE WITH SURFACE HYDROXYLS ON SILICA SO JOURNAL OF CATALYSIS LA English DT Article ID OXIDE; REDUCTION; MONOLAYER; AEROSIL C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,DIV 1846,ALBUQUERQUE,NM 87185. OI Peden, Charles/0000-0001-6754-9928; Datye, Abhaya/0000-0002-7126-8659 NR 27 TC 57 Z9 58 U1 1 U2 9 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 FEB PY 1994 VL 145 IS 2 BP 565 EP 573 DI 10.1006/jcat.1994.1068 PG 9 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA MT818 UT WOS:A1994MT81800037 ER PT J AU POOJARY, DM ZHANG, YP COX, DE RUDOLF, PR CHENG, SF CLEARFIELD, A AF POOJARY, DM ZHANG, YP COX, DE RUDOLF, PR CHENG, SF CLEARFIELD, A TI SYNTHESIS AND CRYSTAL-STRUCTURES OF ALUMINUM AND IRON PHOSPHITES SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY LA English DT Article ID RAY-POWDER DIFFRACTION; ACID PHOSPHITE AB The hydrated forms of aluminum and iron phosphite were prepared and their structure was solved using X-ray powder diffraction data. The diffraction data for the aluminum phosphite powder sample was collected using synchrotron radiation (lambda = 1.3087 angstrom) while that for iron phosphite was obtained from a rotating anode X-ray source. Both compounds crystallize in the monoclinic space group, P2(1). Unit cell parameters for the Al compound: a = 8.0941(1), b = 9.9137(1), c = 7.6254(1) angstrom, beta = 111.95-degrees; Fe compound: a = 8.2548(1), b = 10.1814(1), c = 7.7964(1) (angstrom), beta = 111.94(1)degrees. The Rietveld refined formula is M2(PO3H)3.4H2O (M=Al, Fe). There are two independent metal atoms in the structure and both are six-coordinated. One of them is coordinated by two water molecules and four phosphite oxygens. The other atom is surrounded by one water molecule and five phosphite oxygens. All the phosphite oxygens are involved in bridging the Al atoms. The geometry about Al, Fe, and P atoms is normal and they display expected bond parameters. The Lattice water is located in the cavity and is hydrogen bonded to phosphite oxygen and water molecules. C1 TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843. DOW CHEM CO USA,ANALYT SCI,MIDLAND,MI 48667. BROOKHAVEN NATL LAB,UPTON,NY 11973. NATL TAIWAN UNIV,TAIPEI,TAIWAN. RI G, Neela/H-3016-2014; Clearfield, Abraham/D-4184-2015; OI Clearfield, Abraham/0000-0001-8318-8122; Cheng, Soofin/0000-0002-9568-3742 NR 16 TC 18 Z9 19 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1074-1542 J9 J CHEM CRYSTALLOGR JI J. Chem. Crystallogr. PD FEB PY 1994 VL 24 IS 2 BP 155 EP 163 DI 10.1007/BF01833673 PG 9 WC Crystallography; Spectroscopy SC Crystallography; Spectroscopy GA NM311 UT WOS:A1994NM31100010 ER PT J AU ARNOLD, CC NEUMARK, DM AF ARNOLD, CC NEUMARK, DM TI THRESHOLD PHOTODETACHMENT ZERO-ELECTRON KINETIC-ENERGY SPECTROSCOPY OF SI-3(-) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SMALL SILICON CLUSTERS; LASER-EXCITED FLUORESCENCE; CAS SCF/CI CALCULATIONS; COOLED COPPER TRIMER; PHOTOELECTRON-SPECTROSCOPY; NEGATIVE-IONS; GROUND-STATE; SI3; RESOLUTION; SPECTRA AB The threshold photodetachment zero-electron kinetic energy (ZEKE) spectrum of Si-3(-) is presented and discussed. The spectrum shows well-resolved vibrational structure. A comparison with several ab initio calculations shows that the spectrum is due to transitions to the (3)A(2)' (D-3h) state of Si-3. The symmetric stretch and degenerate e' frequencies for the Si-3 (3)A(2)' State are determined to be 501+/-10 and 337+/-10 cm(-1), respectively. Additional structure observed in the spectrum suggests that the negative ion is a fluxional, Jahn-Teller distorted species; The ZEKE spectrum shows no evidence for transitions to the (1)A(1) state of the neutral, which is predicted to lie very close to the (3)A(2)' state. A comparison of the ZEKE and previously obtained photoelectron spectrum of Si-3(-) suggests that these two states are close in energy, but that transitions to the singlet state are very weak in the ZEKE spectrum. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP ARNOLD, CC (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 59 TC 93 Z9 93 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1994 VL 100 IS 3 BP 1797 EP 1804 DI 10.1063/1.466532 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MU316 UT WOS:A1994MU31600002 ER PT J AU MONKS, PS STIEF, LJ KRAUSS, M KUO, SC KLEMM, RB AF MONKS, PS STIEF, LJ KRAUSS, M KUO, SC KLEMM, RB TI A DISCHARGE FLOW-PHOTOIONIZATION MASS-SPECTROMETRIC STUDY OF HOBR(X (1)A') - PHOTOION YIELD SPECTRUM, IONIZATION-ENERGY, AND THERMOCHEMISTRY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COMPACT EFFECTIVE POTENTIALS; EXPONENT BASIS-SETS; ABSORPTION-SPECTRUM; BROMINE; EFFICIENT; RADICALS; KINETICS; ATOMS AB The photoion yield spectrum of HOBr was measured over the wavelength range lambda= 108-121 nm; by using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. HOBr was generated by the reaction of OH with molecular bromine. A value of(10.62+/-0.04) eV was obtained for the adiabatic ionization energy (I.E.) of HOBr from photoion thresholds, corresponding to the HOBr+((2)A'') <--HOBr((1)A') transition. The structure observed in the spectrum is discussed in terms of the available states for HOBr+, which have been determined using multiconfiguration-self-consistent field calculations. A new value for Delta H-f(0) (298)(HOBr) of-9 kcal mel(-1) is derived from I.E.(HOBr) and estimates of Delta H-f(HOBr+). C1 NIST,CTR ADV RES BIOTECHNOL,ROCKVILLE,MD 20850. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP MONKS, PS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771, USA. RI Monks, Paul/H-6468-2016 OI Monks, Paul/0000-0001-9984-4390 NR 30 TC 32 Z9 32 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 FEB 1 PY 1994 VL 100 IS 3 BP 1902 EP 1907 DI 10.1063/1.466543 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MU316 UT WOS:A1994MU31600014 ER PT J AU FAY, PJ RAY, JR WOLF, RJ AF FAY, PJ RAY, JR WOLF, RJ TI DETAILED BALANCE METHOD FOR CHEMICAL-POTENTIAL DETERMINATION IN MONTE-CARLO AND MOLECULAR-DYNAMICS SIMULATIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ENSEMBLE; METALS; FLUID AB We present a new, nondestructive, method for determining chemical potentials in Monte Carlo and molecular dynamics simulations. The method estimates a value for the chemical potential such that one has a balance between fictitious successful creation and destruction trials in which the Monte Carlo method is used to determine success or failure of the creation/destruction attempts; we thus call the method a detailed balance method. The method allows one to obtain estimates of the chemical potential for a given species in any closed ensemble simulation; the closed ensemble is paired with a ''natural'' open ensemble for the purpose of obtaining creation and destruction probabilities. We present results for the Lennard-Jones system and also for an embedded atom model of liquid palladium, and compare to previous results in the literature for these two systems. We are able to obtain an accurate estimate of the chemical potential for the Lennard-Jones system at higher densities than reported in the literature. C1 WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29808. RP FAY, PJ (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,KINARD LAB PHYS,CLEMSON,SC 29634, USA. NR 21 TC 7 Z9 7 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1994 VL 100 IS 3 BP 2154 EP 2160 DI 10.1063/1.466512 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MU316 UT WOS:A1994MU31600037 ER PT J AU KNICKELBEIN, MB AF KNICKELBEIN, MB TI THE COPPER TRIMER AND ITS ARGON VAN-DER-WAALS COMPLEX - AN ANOMALOUS SHIFT IN THE (A)OVER-TILDE[-(X)OVER-TILDE PHOTODISSOCIATION SPECTRUM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Letter ID FLUORESCENCE EXCITATION SPECTRUM; ELECTRONIC SPECTROSCOPY; GROUND-STATE; VANDERWAALS COMPLEX; GAS COMPLEXES; CLUSTERS; SURFACE; JET; ASSIGNMENT; ENERGIES AB The photodissociation spectra of Cu-3 and Cu3Ar have been recorded from 500 nm to 550 nm. The spectrum of Cu-3 shows a number of resolved vibronic bands in 522-538 nm range, in accord with the previous observations of Morse et al. [J. Chem. Phys. 79, 5316 (1983)]. By contrast, the spectrum of Cu3Ar shows no resolved vibronic structure and is displaced over 20 nm to the blue of the Cu-3 (A) over tilde <-- (X) over tilde origin at 539.8 nm. In addition, the oscillator strength of the Cu3Ar absorption band is a factor of six times larger than that of CU3. These results are discussed in light of the known photophysical and spectroscopic properties of CU3. RP KNICKELBEIN, MB (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 28 TC 8 Z9 8 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 FEB 1 PY 1994 VL 100 IS 3 BP 2388 EP 2390 DI 10.1063/1.466484 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MU316 UT WOS:A1994MU31600062 ER PT J AU WANG, LW ZUNGER, A AF WANG, LW ZUNGER, A TI SOLVING SCHRODINGERS EQUATION AROUND A DESIRED ENERGY - APPLICATION TO SILICON QUANTUM DOTS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Letter ID SEMICONDUCTOR CLUSTERS; ELECTRONIC-STRUCTURE; SURFACE; SI; RECONSTRUCTION; CHEMISORPTION; HYDROGEN AB We present a simple, linear-in-size method that enables calculation of the eigensolutions of a Schrodinger equation in a desired energy window. We illustrate this method by studying the near-gap electronic structure of Si quantum dots with size up to Si1315H460(approximate to 37 Angstrom in diameter) using a plane wave pseudopotential representation. RP WANG, LW (reprint author), NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. NR 29 TC 368 Z9 369 U1 3 U2 22 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1994 VL 100 IS 3 BP 2394 EP 2397 DI 10.1063/1.466486 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MU316 UT WOS:A1994MU31600064 ER PT J AU BARCELLOSHOFF, MH DERYNCK, R TSANG, MLS WEATHERBEE, JA AF BARCELLOSHOFF, MH DERYNCK, R TSANG, MLS WEATHERBEE, JA TI TRANSFORMING GROWTH-FACTOR-BETA ACTIVATION IN IRRADIATED MARINE MAMMARY-GLAND SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Note DE IONIZING RADIATION; TRANSFORMING GROWTH FACTOR-BETA; MAMMARY GLAND; IMMUNOHISTOCHEMISTRY; EXTRACELLULAR MATRIX ID MOLECULAR-WEIGHT COMPLEX; PLASMINOGEN-ACTIVATOR; EXTRACELLULAR-MATRIX; ENDOTHELIAL-CELLS; HUMAN-PLATELETS; FACTOR-BETA-1; EXPRESSION; LOCALIZATION; PRECURSOR; INDUCTION AB The biological activity of TGF-beta, an important modulator of cell proliferation and extracellular matrix formation, is governed by dissociation of mature TGF-beta from an inactive, latent TGF-beta complex in a process that is critical to its role in vivo. So far, it has not been possible to monitor activation in vivo since conventional immunohistochemical detection does not accurately discriminate latent versus active TGF-beta, nor have events associated with activation been defined well enough to serve as in situ markers of this process. We describe here a modified immunodetection method using differential antibody staining that allows the specific detection of active versus latent TGF-beta. Under these conditions, we report that an antibody raised to latency-associated peptide detects latent TGF-beta, and we demonstrate that LC(1-30) antibodies specifically recognize active TGF-beta 1 in tumor xenografts overproducing active TGF-beta 1, without cross-reactivity in tumors expressing similar levels of latent TGF-beta 1. We previously reported that TGF-beta immunoreactivity increases in murine mammary gland after whole-body Co-60-gamma radiation exposure. Using differential antibody staining we now show that radiation exposure specifically generates active TGF-beta 1. While latent TGF-beta 1 was widely distributed in unirradiated tissue, active TGF-beta 1 distribution was restricted. Active TGF-beta 1 increased significantly within 1 h of irradiation concomitant with decreased latent TGF-beta immunoreactivity. This rapid shift in immunoreactivity provides the first evidence for activation of TGF-beta in situ. This reciprocal pattern of expression persisted for 3 d and was accompanied by decreased recovery of latent TGF-beta 1 from irradiated tissue. Radiation-induced activation of TGF-beta may have profound implications for understanding tissue effects caused by radiation therapy. C1 UNIV CALIF SAN FRANCISCO,DEPT ANAT,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT GROWTH & DEV,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,PROGRAM CELL BIOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,PROGRAM DEV BIOL,SAN FRANCISCO,CA 94143. R&D SYST,MINNEAPOLIS,MN 55413. RP BARCELLOSHOFF, MH (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 74-159,BERKELEY,CA 94720, USA. NR 25 TC 279 Z9 289 U1 0 U2 1 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD FEB PY 1994 VL 93 IS 2 BP 892 EP 899 DI 10.1172/JCI117045 PG 8 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA MY296 UT WOS:A1994MY29600056 PM 8113421 ER PT J AU SMITH, DH COVATCH, GL AF SMITH, DH COVATCH, GL TI MEASUREMENT OF BOUNDARIES BETWEEN 2-PHASE AND 3-PHASE REGIONS IN EMULSIFIED SYSTEMS BY TITRATION CALORIMETRY .2. DETERMINATION OF PHASE COMPOSITIONS IN 3-PHASE SYSTEMS SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID WATER; OIL; MICROEMULSION; MORPHOLOGIES; EMULSIONS C1 UNIV OKLAHOMA,INST APPL SURFACTANT RES,NORMAN,OK 73019. UNIV OKLAHOMA,SCH CHEM ENGN & MAT SCI,NORMAN,OK 73019. RP SMITH, DH (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507, USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD FEB PY 1994 VL 162 IS 2 BP 372 EP 380 DI 10.1006/jcis.1994.1051 PG 9 WC Chemistry, Physical SC Chemistry GA MU063 UT WOS:A1994MU06300013 ER PT J AU CRUTCHFIELD, WY BELL, JB AF CRUTCHFIELD, WY BELL, JB TI INSTABILITIES OF THE SKYRME MODEL SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article AB Previous efforts to apply finite difference methods to the Skyrme model to simulate time evolution have discovered apparent numerical instabilities. As a result, previous authors have been forced to take unusually small time-steps and introduce artificial viscosity to maintain stability. This paper analyzes finite difference schemes for. the Skyrme model, demonstrates two mechanisms for the instability, and derives a corrective measure. A stable finite difference scheme in three dimensions which uses a factor of eight less memory than previous schemes is described. (C) 1994 Academic Press, Inc. RP CRUTCHFIELD, WY (reprint author), LAWRENCE LIVERMORE NATL LAB, APPL MATH GRP, LIVERMORE, CA 94550 USA. NR 16 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD FEB PY 1994 VL 110 IS 2 BP 234 EP 241 DI 10.1006/jcph.1994.1021 PG 8 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA ND185 UT WOS:A1994ND18500004 ER PT J AU AMBROSIANO, JJ BRANDON, ST LOHNER, R DEVORE, CR AF AMBROSIANO, JJ BRANDON, ST LOHNER, R DEVORE, CR TI ELECTROMAGNETICS VIA THE TAYLOR-GALERKIN FINITE-ELEMENT METHOD ON UNSTRUCTURED GRIDS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FLUX-CORRECTED TRANSPORT; TIME DOMAIN; TRANSIENT PROBLEMS; MAXWELL EQUATIONS; SCATTERING; ALGORITHMS; FCT AB Traditional techniques for computing electromagnetic solutions in the time domain rely on finite differences. These so-called FDTD (finite-difference time-domain) methods are usually defined only on regular lattices of points and can be too restrictive for geometrically demanding problems. Great geometric flexibility can be achieved by abandoning the regular latticework of sample points and adopting an unstructured grid. An unstructured grid allows one to place the grid points anywhere one chooses, so that curved boundaries can be fit with ease and local regions in which the field gradients are steep can be selectively resolved with a fine mesh. In this paper we present a technique for solving Maxwell's equations on an unstructured grid based on the Taylor-Galerkin finite-element method. We present several numerical examples which reveal the fundamental accuracy and adaptability of the method. Although our examples are in two dimensions, the techniques and results generalize readily to 3D. (C) 1994 Academic Press, Inc. C1 GEORGE WASHINGTON UNIV, SCH ENGN & APPL SCI, CMEE, WASHINGTON, DC 20052 USA. USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, WASHINGTON, DC 20375 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. RI DeVore, C/A-6067-2015 OI DeVore, C/0000-0002-4668-591X NR 34 TC 12 Z9 13 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD FEB PY 1994 VL 110 IS 2 BP 310 EP 319 DI 10.1006/jcph.1994.1028 PG 10 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA ND185 UT WOS:A1994ND18500011 ER PT J AU BIEFELD, RM BAUCOM, KC AF BIEFELD, RM BAUCOM, KC TI SUBSTRATE ORIENTATION AND SURFACE-MORPHOLOGY IMPROVEMENTS FOR INSB GROWN BY METALORGANIC CHEMICAL-VAPOR-DEPOSITION SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID EPITAXIAL-GROWTH; PHASE EPITAXY; MOCVD; GAAS; TERTIARYBUTYLDIMETHYLANTIMONY; TRIISOPROPYLANTIMONY AB Misoriented InSb substrates were used for the growth of InSb with two new organometallic Sb sources, tris(dimethylamino)antimony (TDMASb), and tertiarybutyldimethylantimony (TBDMSb). The surface morphology of InSb grown using either TDMASb or TBDMSb was very rough for growth temperatures less-than-or-equal-to 425-degrees-C. This surface roughness is associated with low temperature and excess Sb or high V/III ratios. Smoother surfaces were generally found when using off-axis substrates. The details of the defects observed on the surfaces were dependent on the type of misorientation and can be related to the atomic structure of the surface steps. The smoothest surfaces were obtained for growth on InSb substrates misoriented 5-degrees towards the [111]In planes. Both n-and p-type InSb were grown using TBDMSb or TDMASb and TMIn with mobilities up to 68,990 and 7773 cm2/V . s, respectively, at 77 K. The mobility for InSb using either TDMASb or TBDMSb was improved by going to lower temperatures (400-degrees-C), pressures (215 Torr) and V/III ratios (2-4). The surface morphology improved with higher temperature (475-degrees-C), and lower pressure (215 Torr), with little or no correlation to the V/III ratio. The growth of high mobility InSb with smooth surfaces at temperatures less-than-or-equal-to 425-degrees-C was not achieved with TDMASb or TBDMSb and TMIn under the conditions investigated in this work. RP BIEFELD, RM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Schaff, William/B-5839-2009 NR 23 TC 3 Z9 3 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD FEB PY 1994 VL 135 IS 3-4 BP 401 EP 408 DI 10.1016/0022-0248(94)90128-7 PG 8 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA MZ054 UT WOS:A1994MZ05400003 ER PT J AU VERNON, SM SANFACON, MM AHRENKIEL, RK AF VERNON, SM SANFACON, MM AHRENKIEL, RK TI GROWTH OF (GAAS)1-X(GE2)X BY METALORGANIC CHEMICAL-VAPOR-DEPOSITION SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 6th Biennial Workshop on Organometallic Vapor Phase Epitaxy CY MAR 21-25, 1993 CL PALM SPRINGS, CA DE III-V-IV2 COMPOUND; GALLIUM ARSENIDE-GERMANIUM ALLOY; METALORGANIC CHEMICAL VAPOR DEPOSITION ID SOLID-SOLUTIONS; ALLOYS AB We report deposition of (GaAs)1-x(Ge2)x on GaAs substrates over the entire alloy range. Growth was performed by metalorganic chemical vapor deposition at temperatures of 675 to 750-degrees-C, at 50 and 760 Torr, using trimethylgallium, arsine, and germane at rates of 2-10 mum/h. Extrinsic doping was achieved using silane and dimethylzinc in hydrogen. Characterization methods include double-crystal x-ray rocking curve analysis, Auger electron spectroscopy, 5K photoluminescence, optical transmission spectra, Hall-effect, and Polaron profiling. Results achieved include an x-ray rocking curve full-width at half maximum as narrow as 12 arc-s, Auger compositions spanning the alloy range from x = 0.03 to x = 0.94, specular surface morphologies, and 5K photoluminescence to wavelengths as long as 1620 nm. Undoped films are n type, with n = 1 x 10(17) cm-3. Extrinsic doping with silane and dimethylzinc have resulted in films which are n type (10(17) to 10(18) cm-3) or p type (5 x 10(18) to 1 x 10(20) cm-3). Mobilities are generally almost-equal-to 50 cm2/V-s and 500 cm2/V-s, for p and n films, respectively. C1 NREL,GOLDEN,CO 80401. RP VERNON, SM (reprint author), SPIRE CORP,BEDFORD,MA 01730, USA. RI Schaff, William/B-5839-2009 NR 10 TC 2 Z9 2 U1 3 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD FEB PY 1994 VL 23 IS 2 BP 147 EP 151 DI 10.1007/BF02655261 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MX217 UT WOS:A1994MX21700015 ER PT J AU KILLEEN, KP BREILAND, WG AF KILLEEN, KP BREILAND, WG TI IN-SITU SPECTRAL REFLECTANCE MONITORING OF III-V EPITAXY SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 6th Biennial Workshop on Organometallic Vapor Phase Epitaxy CY MAR 21-25, 1993 CL PALM SPRINGS, CA DE ALAS/ALGAAS IN-SITU REFLECTANCE MONITORING; METALORGANIC CHEMICAL VAPOR DEPOSITION (MOCVD) ID MOLECULAR-BEAM EPITAXY; CHEMICAL VAPOR-DEPOSITION; GROWTH-RATE MEASUREMENTS; NE-LASER SYSTEM; OPTICAL REFLECTIVITY; ALXGA1-XAS; ALGAAS; GAAS; ALAS; SILICON AB Near normal incidence spectral reflectance was used to monitor the growth of AlAs, GaAs, and AlGaAs films by metalorganic chemical vapor deposition in real time. The simultaneous acquisition of reflectance data over a wide spectral bandwidth allows compositional discrimination between layers and greater thickness sensitivity than single wavelength measurements. The potential of this technique for application to device structures was demonstrated by monitoring the fabrication of AlAs/AlGaAs visible distributed Bragg reflectors. RP KILLEEN, KP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 37 Z9 37 U1 1 U2 14 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD FEB PY 1994 VL 23 IS 2 BP 179 EP 183 DI 10.1007/BF02655266 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MX217 UT WOS:A1994MX21700020 ER PT J AU BERTNESS, KA KRAMER, C OLSON, JM MORELAND, J AF BERTNESS, KA KRAMER, C OLSON, JM MORELAND, J TI IN-SITU OBSERVATION OF SURFACE-MORPHOLOGY IN INP GROWN ON SINGULAR AND VICINAL (001) SUBSTRATES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 6th Biennial Workshop on Organometallic Vapor Phase Epitaxy CY MAR 21-25, 1993 CL PALM SPRINGS, CA DE INDIUM PHOSPHIDE; ORGANOMETALLIC VAPOR PHASE EPITAXY (OMVPE); SUBSTRATE ORIENTATION; SURFACE MORPHOLOGY ID CHEMICAL VAPOR-DEPOSITION; MOLECULAR-BEAM EPITAXY; GAAS; REFLECTANCE; SCATTERING AB Surface morphology of InP layers is monitored during organometallic vapor phase epitaxy using an in situ diffuse laser light scattering technique. Changes in the diffuse scatter signal are noted for several substrate orientations near the (001) plane and at various growth temperatures. The diffuse scatter signal is shown to be a semi-quantitative indicator of surface roughness through post-growth examination of the samples with phase contrast optical microscopy and atomic force microscopy. Singular substrates consistently have almost featureless surfaces and very little diffuse scattering during growth. Vicinal substrates display a more complicated morphological evolution which cannot be deduced from the diffuse scattering alone but which does produce characteristic changes in diffuse scattering. C1 NATL INST STAND & TECHNOL,DIV ELECTROMAGNET,BOULDER,CO 80303. RP BERTNESS, KA (reprint author), NATL RENEWAL ENERGY LAB,DIV BASIC SCI,GOLDEN,CO 80401, USA. RI Schaff, William/B-5839-2009 NR 17 TC 3 Z9 3 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD FEB PY 1994 VL 23 IS 2 BP 195 EP 200 DI 10.1007/BF02655269 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MX217 UT WOS:A1994MX21700023 ER PT J AU NEUGEBAUER, M GOLDSTEIN, BE BAME, SJ FELDMAN, WC AF NEUGEBAUER, M GOLDSTEIN, BE BAME, SJ FELDMAN, WC TI ULYSSES NEAR-ECLIPTIC OBSERVATIONS OF DIFFERENTIAL FLOW BETWEEN PROTONS AND ALPHAS IN THE SOLAR-WIND SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HELIUM; HYDROGEN; 1-AU AB The evolution of differential streaming between protons and alpha particles in the solar wind was observed with the solar wind plasma experiment on the Ulysses spacecraft over the solar range of 1.15 to 5.40 AU between November 18, 1990, and May 5, 1992. The correlation of the difference in ion speeds, Delta V=\V-alpha\-\V-p\, with the proton speed V-p observed by other spacecraft at solar distances less than or equal to 1 AU disappeared at similar to 2 AU. At solar distances greater than or equal to 2.85 AU, the largest values of both V-alpha p=\V-alpha p\=\V-alpha-VP\ and \Delta V\ were found in the interaction regions on the leading edges of high-speed streams. The differential; streaming was typically enhanced just downstream of strong forward and reverse shocks, and large negative values of Delta V were frequently encountered in the interaction regions. A correlation between V-alpha p and the ratio tau(c)/tau(e) of Coulomb collision time to expansion time was observed at all distances,but it is suggested that at the larger values of tau(c)/tau(e) the observed correlation may arise from enhanced production of differential streaming by processes that also increase the entropy of the solar wind protons. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP NEUGEBAUER, M (reprint author), CALTECH,JET PROP LAB,4800 OAK GROVE DR,MS 169-506,PASADENA,CA 91109, USA. NR 23 TC 33 Z9 33 U1 2 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1994 VL 99 IS A2 BP 2505 EP 2511 DI 10.1029/93JA02615 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600037 ER PT J AU TAN, MJ CHO, DH CHEUNG, FB AF TAN, MJ CHO, DH CHEUNG, FB TI THERMAL-ANALYSIS OF HEAT-GENERATING POOLS BOUNDED FROM BELOW BY CURVED SURFACES SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE COMPUTER CODES; NATURAL CONVECTION; TRANSIENT AND UNSTEADY HEAT TRANSFER AB A computer code that features the use of a directional effective thermal conductivity in modeling natural convection in heat-generating pools has been developed to analyze heat transfer in such pools, which are bounded from below by curved surfaces. Illustrative calculations pertaining to two published experimental studies on convective heat transfer in water pools with uniformly distributed volumetric energy sources are carried out using the code. The water pools used in the two studies under consideration were cooled either from the top or from the bottom, but not from both. The utility as well as the limitations of the effective thermal conductivity approach in the context of addressing the issue of melt-pool coolability is demonstrated by comparisons of calculated results with the experimental data. C1 PENN STATE UNIV,DEPT MECH ENGN,UNIV PK,PA 16802. RP TAN, MJ (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,ARGONNE,IL 60439, USA. NR 12 TC 2 Z9 2 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1994 VL 116 IS 1 BP 127 EP 135 DI 10.1115/1.2910846 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MY986 UT WOS:A1994MY98600018 ER PT J AU PASAMEHMETOGLU, KO AF PASAMEHMETOGLU, KO TI TURBULENT NATURAL-CONVECTION HEAT-TRANSFER TO GASES AT HIGH WALL TEMPERATURES SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Note DE HIGH-TEMPERATURE PHENOMENA; MODELING AND SCALING; NATURAL CONVECTION ID VARIABLE PROPERTIES RP PASAMEHMETOGLU, KO (reprint author), LOS ALAMOS NATL LAB,DIV NUCL TECHNOL & ENGN,LOS ALAMOS,NM 87545, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1994 VL 116 IS 1 BP 246 EP 247 DI 10.1115/1.2910867 PG 2 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MY986 UT WOS:A1994MY98600038 ER PT J AU MOSES, WW DERENZO, SE WEBER, MJ RAYCHAUDHURI, AK CERRINA, F AF MOSES, WW DERENZO, SE WEBER, MJ RAYCHAUDHURI, AK CERRINA, F TI SCINTILLATION MECHANISMS IN CERIUM FLUORIDE SO JOURNAL OF LUMINESCENCE LA English DT Article ID ALKALI-HALIDES; CRYSTALS; LAF3; TRIFLUORIDES; EXCITATION; LANTHANUM AB Ultraviolet photoelectron spectroscopy, optical transmission, fluorescence excitation spectroscopy and time-resolved fluorescence spectroscopy are used to investigate the scintillation mechanisms of cerium fluoride (CeF3) and of lanthanum fluoride doped with cerium in concentrations between 0.01 and 50mol% cerium. In LaF3:Ce, the absorption of either optical or ionizing radiation directly or indirectly results in excitation of the Ce3+ 4f electron to the lowest 5d level followed by 5d --> 4f fluorescence at 284-300 nm. Whereas for optical excitation the fluorescence has a 20 ns decay time, for ionizing radiation there is an additional faster (2-10 ns) initial decay component. As the cerium concentration increases, another band appears that partially absorbs the 284 300 nm emission and re-radiates it in a broad band peaking at 340 nm and having a longer (approximately 30 ns) decay time. In the limit of 100% CeF3, radiation trapping is very pronounced. The additional absorption and emission bands present at large Ce concentrations are attributed to Ce3+ ions in perturbed sites. The relative efficiency for excitation of unperturbed and perturbed cerium sites via the Ce3+ 5d and 6s bands, the F- 2p valence band, and the Ce3+ or La3+ 5p core levels are determined from fluorescence excitation spectra. C1 UNIV WISCONSIN,MADISON,WI 53706. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MOSES, WW (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 32 TC 63 Z9 64 U1 2 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD FEB PY 1994 VL 59 IS 1-2 BP 89 EP 100 DI 10.1016/0022-2313(94)90026-4 PG 12 WC Optics SC Optics GA NH278 UT WOS:A1994NH27800012 ER PT J AU LUO, JS LEE, HG SINHA, SN AF LUO, JS LEE, HG SINHA, SN TI MICROSTRUCTURE AND SUPERCONDUCTING PROPERTIES OF ATTRITION-MILLED BI2SR2CACU2OX SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID TRANSFORMATION; TEMPERATURE; CERAMICS; CRYSTAL; PHASES; SYSTEM AB The microstructure and superconducting properties of Bi2Sr2CaCu2Ox (Bi-2212) during high-energy attrition milling were investigated in detail by a combination of x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and magnetization techniques. The starting superconducting powder was milled in a standard laboratory attritor using yttria-stabilized ZrO2 balls and a stainless steel tank. After selected time increments, the milling was interrupted and a small quantity of milled powder was removed for further analysis. It was found that the deformation process rapidly refines Bi-2212 into nanometer-size crystallites, increases atomic-level strains, and changes the plate-like morphology of Bi-2212 to granular submicron clusters. At short milling times, the deformation seems localized at weakly linked Bi-O double layers, leading to twist/cleavage fractures along the {001} planes. The Bi-2212 phase decomposes into several bismuth-based oxides and an amorphous phase after excessive deformation. The superconducting transition is depressed by about 10 K in the early stages of milling and completely vanishes upon prolonged deformation. A deformation mechanism is proposed and correlated with the evolution of superconducting properties. The practical implications of these results are presented and discussed. C1 UNIV ILLINOIS,CHICAGO,IL 60680. RP LUO, JS (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 28 TC 9 Z9 9 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 297 EP 304 DI 10.1557/JMR.1994.0297 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200009 ER PT J AU VENKATRAMAN, R BESSER, PR BRAVMAN, JC BRENNAN, S AF VENKATRAMAN, R BESSER, PR BRAVMAN, JC BRENNAN, S TI ELASTIC STRAIN GRADIENTS AND X-RAY-LINE BROADENING EFFECTS AS A FUNCTION OF TEMPERATURE IN ALUMINUM THIN-FILMS ON SILICON SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID STRESS-RELAXATION; DIFFRACTION; SCATTERING; REFLECTION; INTERFACE; SUBSTRATE; GROWTH; SI AB Grazing incidence x-ray scattering (GIXS) with a synchrotron source was used to measure elastic strain gradients as a function of temperature in aluminum and aluminum alloy thin films of different thicknesses on silicon. The stresses in the films are induced as a result of the difference in thermal expansion coefficient between film and substrate. Disregarding minor deviations at the surface, it is shown that there are no gross strain gradients in these films in the range of temperatures (between room temperature and 400 degrees C) considered. Significant x-ray line broadening effects were observed, suggesting an accumulation of dislocations on cooling the films and their annealing out as the films were being reheated. The variation of the dislocation density during thermal cycling compares well in nature with that of the concurrent variation in film stress, indicating that large strain hardening effects contribute toward the film flow stress. C1 STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP VENKATRAMAN, R (reprint author), IBM CORP,1701 NORTH ST,ENDICOTT,NY 13760, USA. NR 35 TC 18 Z9 18 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 328 EP 335 DI 10.1557/JMR.1994.0328 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200013 ER PT J AU SUITS, BH MENG, M SIEGEL, RW LIAO, YX AF SUITS, BH MENG, M SIEGEL, RW LIAO, YX TI STUDY OF CLUSTER-ASSEMBLED NANOPHASE COPPER USING NMR SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID DIFFUSION; PD AB Cu NMR spectra from cluster-assembled nanophase copper with an average grain size between 5 and 10 nm show a broadened peak, at the normal Knight-shifted frequency for copper metal, which arises from only the central 1/2 to -1/2 transition. The broadening of the central line is associated with a distribution of Knight shifts. A very broad background is observed on either side of that peak, associated with broadening due to internal electric field gradients. Pulsed NMR measurements of the central peak show that virtually all the copper signals are significantly broadened and have a spin-spin relaxation time longer than larger-grained copper samples. The strain within the grains is estimated to be 0.7%. Line shape measurements as a function of spin echo delay time show there are a number of copper sites with longer relaxation times which have a significantly larger broadening. Those sites are tentatively identified as being at or near a grain boundary or free surface. A small orientation effect is observed indicating an anisotropy within the samples. An isochronal anneal of one sample showed significant line narrowing after an anneal at 450 degrees C consistent with other nanophase metals which show grain growth above 40-50% of the absolute melting temperature. The dependence of NMR linewidth on average grain diameter is estimated. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SUITS, BH (reprint author), MICHIGAN TECHNOL UNIV,DEPT PHYS,HOUGHTON,MI 49931, USA. NR 20 TC 9 Z9 9 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 336 EP 342 DI 10.1557/JMR.1994.0336 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200014 ER PT J AU SHIELD, JE KRAMER, MJ MCCALLUM, RW AF SHIELD, JE KRAMER, MJ MCCALLUM, RW TI PLASTIC-DEFORMATION IN ICOSAHEDRAL AL-PD-MN ALLOYS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID DISLOCATIONS; QUASICRYSTALS; CRYSTAL AB The deformation characteristics of icosahedral Al70Pd21.5Mn8.5 have been investigated by high temperature creep experiments, and the resultant microstructures have been examined by transmission electron microscopy (TEM). From 730 to 780 degrees C, microstructural analysis revealed that the deformation is controlled by dislocation glide, with an activation energy of 210 +/- 30 kJ/mole and a stress exponent of 1.2 +/- 0.2. From 780 to 810 degrees C, microstructures were characteristic of deformation controlled by dislocation glide and climb. The activation energy and stress exponent were determined to be 1700 +/- 80 kJ/mole and 2.9 +/- 0.3, respectively. Hardness measurements also reflected an increase in dislocation density, as the hardness of the deformed samples was approximately 10% higher than the as-cast sample. C1 IOWA STATE UNIV,US DOE,AMES LAB,AMES,IA 50011. NR 16 TC 30 Z9 30 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 343 EP 347 DI 10.1557/JMR.1994.0343 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200015 ER PT J AU METIN, S KAUFMAN, JH SAPERSTEIN, DD SCOTT, JC HEYMAN, J HALLER, EE AF METIN, S KAUFMAN, JH SAPERSTEIN, DD SCOTT, JC HEYMAN, J HALLER, EE TI AMORPHOUS-CARBON ANTIREFLECTIVE COATINGS IN THE 10 TO 50 MU-M REGION OF THE FAR-IR SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID OPTICAL-PROPERTIES; HARD CARBON; FILMS; DIAMOND; LAYERS; GROWTH AB The efficiency of far-IR germanium photoconductive detectors can be markedly improved by antireflective coatings. Recently, there has been an effort to develop several micrometer thick, low stress, amorphous carbon films for this purpose. To date, films of no more than 1 to 2 mu m have been reported in the literature. In this paper we report the deposition of low stress carbon films which are over 5 mu m thick and are effective antireflective coatings at wavelengths of up to lambda = 43 mu m. Minimal stress, a requirement for good adhesion, was achieved with a chemical vapor deposition process (CVD) by controlling the hydrocarbon partial pressure (2.2 mTorr) and by doping the carbon film with nitrogen. C1 IBM CORP,ADSTAR,SAN JOSE,CA 95193. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP METIN, S (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERALS ENGN,BERKELEY,CA 94720, USA. NR 18 TC 18 Z9 18 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 396 EP 400 DI 10.1557/JMR.1994.0396 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200022 ER PT J AU KODAMA, T KATO, H CHANG, SG HASEGAWA, N TSUJI, M TAMAURA, Y AF KODAMA, T KATO, H CHANG, SG HASEGAWA, N TSUJI, M TAMAURA, Y TI DECOMPOSITION OF CO2 TO CARBON BY H-2-REDUCED NI(II)- AND CO(II)-BEARING FERRITES AT 300-DEGREES-C SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID AIR OXIDATION; FE(OH)2 SUSPENSIONS; HYDROGENATION; DIOXIDE; FE3O4 AB Ni(II)- and Co(II)-bearing ferrites with different levels of metal substitution have been studied for CO2 decomposition. Ni2+ and Co2+ have been substituted for Fe2+ or Fe3+ in magnetite with the spinel type of crystal structure up to 14% and 26% for the mole ratio of Ni2+ and Co2+ to the total Fe contents, respectively. The metal substitution was corroborated by Mossbauer spectroscopy and XRD studies. They were activated in a flow of HZ gas to form oxygen-deficient ferrites with the spinel structure retained. The oxygen-deficient M(II)-bearing ferrites have been found to show high reactivity toward CO2 decomposition to carbon at 300 degrees C. The reactivity increased with the level of metal substitution and activation. The oxygens of CO2 were incorporated into the spinel structure and carbon was deposited on the surface of the ferrites. The deposited carbon was visible on dissolution of the ferrites used. The rate of decomposition on H-2-activated Ni(II)-bearing ferrite with the mole ratio of 14% was 30 times as high as that of H-2-activated magnetite. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KODAMA, T (reprint author), TOKYO INST TECHNOL,DEPT CHEM,CARBON RECYCLING & UTILIZAT RES CTR,MEGURO KU,2-12-1 OOKAYAMA,TOKYO 152,JAPAN. NR 20 TC 20 Z9 20 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 462 EP 467 DI 10.1557/JMR.1994.0462 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200031 ER PT J AU SILLS, JA MARTIN, SW TORGESON, DR AF SILLS, JA MARTIN, SW TORGESON, DR TI B-11 NMR-STUDIES OF THE SHORT-RANGE ORDER IN WIDE COMPOSITION RANGE XNA2S+(1-X)B2S3 GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; CHALCOGENIDE GLASSES; BORATE GLASSES; MAS-NMR; SYSTEM; ALKALI; RELAXATION; SPECTRA; SODIUM; OXIDE AB The B-11 NMR spectra of high purity (low oxygen contamination) xNa(2)S + (1 - x)B2S3 glasses with O less than or equal to x less than or equal to 0.80 are reported. Glasses were prepared in both the low alkali (0 less than or equal to x less than or equal to 0.30) and high alkali (0.60 less than or equal to x less than or equal to 0.80) ming ranges. These two glass-forming ranges are similar in composition to the two glass-forming ranges in the analogous xNa(2)O + (1 -x)B2O3 system. As in this latter system, the B-11 NMR spectrum of vitreous B2S3 (v-B2S3) consists of a quadrupolar broadened single line and confirms the short range order (SRO) of trigonally coordinated borons. As Na2S is added, again in similarity to the oxide system, a single narrow line grows at the resonance frequency and confirms the SRO of the highly symmetric tetrahedral boron group. By contrast with the oxides, however, the fractions of tetrahedral borons that are created by the addition of Na2S to B2S3 are a factor of three to four times greater at any given composition. Here, rather than forming two tetrahedral borons for each added S-= anion, the rate is likely to be six or eight tetrahedral borons per added S-= anion. A structural model incorporating this feature of the sulfide glasses has been developed. After this initial large increase in the fraction of tetrahedral borons in the low alkali glass-forming region, the fraction begins to decrease, and by 75 mol% Na2S is approximately zero. This decrease in the tetrahedral boron fraction is associated with the formation of the trigonal, totally depolymerized orthothioborate group, Na3BS3. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. NR 34 TC 23 Z9 23 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD FEB PY 1994 VL 168 IS 1-2 BP 86 EP 96 DI 10.1016/0022-3093(94)90123-6 PG 11 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA MV892 UT WOS:A1994MV89200010 ER PT J AU DAVIS, PJ DESHPANDE, R SMITH, DM BRINKER, CJ ASSINK, RA AF DAVIS, PJ DESHPANDE, R SMITH, DM BRINKER, CJ ASSINK, RA TI PORE STRUCTURE EVOLUTION IN SILICA-GEL DURING AGING/DRYING .4. VARYING PORE FLUID PH SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID PRECIPITATION AB In an effort to understand the various phenomena which occur during aging of silica gels at different pH, silica particles prepared by three routes distinguished principally by their silicon coordination (Q(n) distributions) (Stober silica spheres, Ludox and Cab-O-Sil) were employed. In situ techniques were used including proton spin-lattice relaxation, SAXS and zeta potential for the wet state and Si-29 MAS-NMR, SEM, TEM and N-2 sorption for dry samples. In solution, the surface area increased in the following order after aging at pH 10 as compared with that at pH 7 and the initial dry surface area: Cab-O-Sil < Ludox << Stober which is inversely proportional to the degree of silicon coordination. This same trend was observed for the surface charge measurements. Surface areas calculated from Si-29 MAS-NMR for four different Stober sphere sizes were of order 1000 m(2)/g as compared with nitrogen/BET surface areas which varied from 9 to 370 m(2)/g, indicating significant internal surface which is inaccessible to nitrogen. The Si-29 NMR results for the Stober spheres were consistent with a close packed aggregate of similar to 3 nm primary particles. In addition to particulate silica, aging at varying pH of a two-step acid/base-catalyzed silica gel was studied. At all pH values, the surface area was higher in the wet gel as compared with the xerogel. Aging at higher pH was found to yield lower surface area, larger pore volume and a narrower pore size distribution depending upon the pH, aging time and surface tension of the final pore fluid. C1 UNIV NEW MEXICO,NSF,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,DIV 1846,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DIV 1812,ALBUQUERQUE,NM 87185. NR 19 TC 40 Z9 40 U1 3 U2 25 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD FEB PY 1994 VL 167 IS 3 BP 295 EP 306 DI 10.1016/0022-3093(94)90252-6 PG 12 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA MU683 UT WOS:A1994MU68300009 ER PT J AU SOM, P OSTER, ZH AF SOM, P OSTER, ZH TI THROMBUS-SPECIFIC IMAGING - APPROACHING THE ELUSIVE GOAL SO JOURNAL OF NUCLEAR MEDICINE LA English DT Editorial Material ID DEEP-VEIN THROMBOSIS; MONOCLONAL-ANTIBODY; VENOUS THROMBOSIS; ANTIFIBRIN ANTIBODY; PLATELETS; FIBRIN; IMMUNOSCINTIGRAPHY; PLASMINOGEN; PEPTIDE; AGENT C1 SUNY STONY BROOK,STONY BROOK,NY. RP SOM, P (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. NR 41 TC 8 Z9 8 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD FEB PY 1994 VL 35 IS 2 BP 202 EP 203 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MX196 UT WOS:A1994MX19600006 ER PT J AU SUSSKIND, H AF SUSSKIND, H TI TECHNETIUM-99M-DTPA AEROSOL TO MEASURE ALVEOLAR-CAPILLARY MEMBRANE-PERMEABILITY SO JOURNAL OF NUCLEAR MEDICINE LA English DT Editorial Material ID PULMONARY EPITHELIAL PERMEABILITY; BRONCHOALVEOLAR LAVAGE; SYSTEMIC-SCLEROSIS; CLEARANCE; LUNGS; ACID; TC-99M-DTPA; DISEASE RP SUSSKIND, H (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 22 TC 23 Z9 23 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD FEB PY 1994 VL 35 IS 2 BP 207 EP 209 PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MX196 UT WOS:A1994MX19600008 PM 8294986 ER PT J AU BADGER, CC FISHER, DR AF BADGER, CC FISHER, DR TI THE IMPORTANCE OF ACCURATE RADIATION-DOSIMETRY IN RADIOIMMUNOTHERAPY OF CANCER SO JOURNAL OF NUCLEAR MEDICINE LA English DT Editorial Material C1 PACIFIC NW LAB, DOSIMET MODELLING GRP, RICHLAND, WA 99352 USA. APPL RECOGNIT TECHNOL INC, KINGSTON, WA USA. NR 12 TC 8 Z9 8 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD FEB PY 1994 VL 35 IS 2 BP 300 EP 302 PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MX196 UT WOS:A1994MX19600026 PM 8295003 ER PT J AU WEBER, DA IVANOVIC, M FRANCESCHI, D STRAND, SE ERLANDSSON, K FRANCESCHI, M ATKINS, HL CODERRE, JA SUSSKIND, H BUTTON, T LJUNGGREN, K AF WEBER, DA IVANOVIC, M FRANCESCHI, D STRAND, SE ERLANDSSON, K FRANCESCHI, M ATKINS, HL CODERRE, JA SUSSKIND, H BUTTON, T LJUNGGREN, K TI PINHOLE SPECT - AN APPROACH TO IN-VIVO HIGH-RESOLUTION SPECT IMAGING IN SMALL LABORATORY-ANIMALS SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE PINHOLE SPECT; TUMOR IMAGING; TECHNETIUM-99M-DTPA; TECHNETIUM-99M-MIBI; TECHNETIUM-99M-HMPAO; THALLIUM-201-CHLORIDE AB The performance of pinhole SPECT and the application of this technology to investigate the localization properties of radiopharmaceuticals in vivo in small laboratory animals are presented. Methods: System sensitivity and spatial resolution measurements of a rotating scintillation camera system are made for a low-energy pinhole collimator equipped with 1.0-, 2.0- and 3.3-mm aperture pinhole inserts. The spatial detail offered by pinhole SPECT for in vivo imaging was investigated in studies of the brain and heart in Fisher 344 rats by administering (TICI)-T-201, Tc-99m-HMPAO, (TC)-T-99m-DTPA and Tc-99m-MIBI. Image acquisition is performed using a rotating scintillation camera equipped with a pinhole collimator; projection data are acquired in conventional step-and-shoot mode as the camera is rotated 360 degrees around the subject. Pinhole SPECT images are reconstructed using a modified cone-beam algorithm developed from a two-dimensional fanbeam filtered backprojection algorithm. Results: The reconstructed transaxial resolution of 2.8 mm FWHM and system sensitivity of 0.086 c/s/kBq with the 2.0-mm pinhole collimator aperture provide excellent spatial detail and adequate sensitivity for imaging the regional uptake of the radiopharmaceuticals in tumor, organs and other tissues in small laboratory animals. Conclusion: The resolution properties of pinhole SPECT are superior to those which have been achieved thus far with conventional SPECT or PET imaging technologies. Pinhole SPECT provides an important approach for investigating localization properties of radiopharmaceuticals in vivo. C1 LUND UNIV,DEPT RADIAT PHYS,S-22101 LUND,SWEDEN. UNIV ZAGREB,HOSP SESTRE MILOSRDNICE,ZAGREB,CROATIA. SUNY STONY BROOK,HLTH SCI CTR,DEPT RADIOL,STONY BROOK,NY 11794. RP WEBER, DA (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 13 TC 184 Z9 186 U1 1 U2 7 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD FEB PY 1994 VL 35 IS 2 BP 342 EP 348 PG 7 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MX196 UT WOS:A1994MX19600031 PM 8295008 ER PT J AU LIU, LC AF LIU, LC TI AN INTEGRAL-EQUATION FOR REACTION AMPLITUDES SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article AB It is shown that the meson-nucleus inelastic transition or reaction amplitude can be calculated by means of solving a single integral equation. This integral-equation method represents a useful alternative to solving coupled equations in the usual multichannel formalism. The method can be implemented easily for meson-nucleus reactions leading to two-body final states, eliminating the need to use the distorted-wave Born approximation. With the aid of this integral equation, the quality of the extensively employed distorted-wave Born approximation is assessed quantitatively through an example. RP LIU, LC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-2,LOS ALAMOS,NM 87545, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD FEB PY 1994 VL 20 IS 2 BP 275 EP 285 DI 10.1088/0954-3899/20/2/007 PG 11 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA MX828 UT WOS:A1994MX82800007 ER PT J AU TIMMERS, H SIMPSON, J RILEY, MA BENGTSSON, T BENTLEY, MA HANNA, F MULLINS, SM SHARPEYSCHAFER, JF WYSS, R AF TIMMERS, H SIMPSON, J RILEY, MA BENGTSSON, T BENTLEY, MA HANNA, F MULLINS, SM SHARPEYSCHAFER, JF WYSS, R TI HIGH-SPIN GAMMA-RAY SPECTROSCOPY OF XE-122 SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article DE ZR-96(SI-30,4N),E(SI-30)=135MEV; 50-ELEMENT BGO CALORIMETER, 16 ESCAPE-SUPPRESSED SPECTROMETERS (GE AND BGO); GAMMA-GAMMA COINCIDENCE, E(GAMMA), INT(GAMMA), ANGULAR CORRELATION RATIOS; LEVEL SCHEME, E(X), I(PI); COMPARED WITH MHO AND WS CSM, TRS, PES; BAND CROSSINGS, QP AND SP CONFIGURATIONS, SHAPE COMPETITION, BAND TERMINATION ID SHAPE COEXISTENCE; NEUTRON ALIGNMENT; BAND TERMINATION; MASS REGION; NUCLEI; PROTON; STATES; BA-124; I-121 AB High-spin states were populated in Xe-122(54)68 using the fusion evaporation reaction Zr-96(Si-30,4n) at a beam energy of 135MeV. The level scheme of 122Xe has been extended up to spin approximately 30HBAR. The rotational bands and band crossings in 122Xe are assigned within the framework of the cranked shell model. Three bands are found to lose their rotational character or to branch above spin approximately 20HBAR. This is interpreted as the collective rotation of a prolate nucleus being replaced by a regime of non-collective single-particle states at high spin. Single-particle configurations are suggested for the high-spin non-collective states using modified oscillator and Woods-Saxon potentials. The development of the nuclear shape is analysed employing potential energy and total Routhian surface calculations. C1 UNIV LIVERPOOL, OLIVER LODGE LAB, LIVERPOOL L69 3BX, ENGLAND. SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. MANNE SIEGBAHN INST PHYS, S-10405 STOCKHOLM, SWEDEN. LUND INST TECHNOL, DEPT MATH PHYS, S-22100 LUND, SWEDEN. OAK RIDGE NATL LAB, JOINT INST HEAVY ION RES, OAK RIDGE, TN 37831 USA. NR 35 TC 21 Z9 21 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 EI 1361-6471 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD FEB PY 1994 VL 20 IS 2 BP 287 EP 305 DI 10.1088/0954-3899/20/2/008 PG 19 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA MX828 UT WOS:A1994MX82800008 ER PT J AU CHANG, SJ AF CHANG, SJ TI PROBABILITY OF FRACTURE FOR HFIR PRESSURE-VESSEL CAUSED BY RANDOM CRACK SIZE OR BY RANDOM TOUGHNESS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB The probability of fracture (or the fracture fragility) for a range of internal pressure-pulses for the HFIR pressure vessel is obtained. The fracture is assumed to be caused by randomly distributed cracks and by fracture toughness of variable magnitudes. The probability curve is applied to estimate the vessel fracture strength against the pressure-pulses of hypothetical accident. Both the crack population and the fracture toughness are assumed to be random variables of given distribution functions. Possible hoop stress is based on the numerical solution of the vessel response after a point pressure-pulse is applied at the center of the reactor vessel. The fluid-structure interaction and radiation embrittlement are both considered in the analysis. Only elastic fracture mechanics is used. The probability of vessel fracture for a single crack caused by either a variable crack depth or a variable toughness is first derived. Then the probability of fracture with multiple number of cracks is obtained. The probability of fracture is further extended to include different levels of confidence and variability. RP CHANG, SJ (reprint author), OAK RIDGE NATL LAB,DIV RES REACTORS,OAK RIDGE,TN 37831, USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD FEB PY 1994 VL 116 IS 1 BP 24 EP 29 DI 10.1115/1.2929554 PG 6 WC Engineering, Mechanical SC Engineering GA MZ521 UT WOS:A1994MZ52100003 ER PT J AU ALAM, SL SATTERLEE, JD EDMONDS, CG AF ALAM, SL SATTERLEE, JD EDMONDS, CG TI COMPLETE AMINO-ACID-SEQUENCE OF THE GLYCERA-DIBRANCHIATA MONOMER HEMOGLOBIN COMPONENT-IV - STRUCTURAL IMPLICATIONS SO JOURNAL OF PROTEIN CHEMISTRY LA English DT Article DE HEMOGLOBIN; AMINO ACID SEQUENCE; MASS SPECTROMETRY; MOLECULAR MODELING ID SLOW CYANIDE BINDING; INTRACELLULAR HEMOGLOBIN; ELECTROSPRAY IONIZATION; OXYGEN BINDING; SPERM WHALE; HETEROGENEITY; RESOLUTION; FRACTION; MYOGLOBIN; PURITY AB The globin derived from the monomer Component IV hemoglobin of the marine annelid, Glycera dibranchiata, has been completely sequenced, and the resulting information has been used to create a structural model of the protein. The most important result is that the consensus sequence of Component IV differs by 3 amino acids from a cDNA-predicted amino acid sequence thought earlier to encode the Component IV hemoglobin. This work reveals that the histidine (E7), typical of most heme-containing globins, is replaced by leucine in Component IV. Also significant is that this sequence is not identical to any of the previously reported Glycera dibranchiata monomer hemoglobin sequences, including the sequence from a previously reported crystal structure, but has high identity to all. A three-dimensional structual model for monomer Component IV hemoglobin was constructed using the published 1.5 Angstrom crystal structure of a monomer hemoglobin from Glycera dibranchiata as a template. The model shows several interesting features: (1) a Phe31 (B10) that is positioned in the active site; (2) a His39 occurs in an interhelical region occupied by Pro in 98.2% of reported globin sequences; and (3) a Met41 is found at a position that emerges from this work as a previously unrecognized heme contact. C1 WASHINGTON STATE UNIV, DEPT CHEM, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, DEPT BIOCHEM BIOPHYS, PULLMAN, WA 99164 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. FU NIGMS NIH HHS [GM57523] NR 38 TC 10 Z9 11 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0277-8033 J9 J PROTEIN CHEM JI J. Protein Chem. PD FEB PY 1994 VL 13 IS 2 BP 151 EP 164 DI 10.1007/BF01891974 PG 14 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NJ061 UT WOS:A1994NJ06100002 PM 8060489 ER PT J AU SKOCYPEC, RD HOGAN, RE AF SKOCYPEC, RD HOGAN, RE TI INVESTIGATION OF A DIRECT CATALYTIC ABSORPTION REACTOR FOR HAZARDOUS-WASTE DESTRUCTION SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB Direct Calatytic Absorption Reactors (DCARs) use a porous solid matrix to volumetrically absorb solar energy. This energy is used to promote heterogeneous chemistry on the catalytic surface of the absorber with fluid-phase reactant species. Experimental efforts at Sandia National Laboratories (SNL) are using a DCAR to destroy hazardous chemical waste. A numerical model, previously developed to analyze solar volumetric air-heating receivers and methane-reforming reactors, is extended in this work to include the destruction of a chlorinated hydrocarbon chemical waste, 1,1,1-trichloroethane (TCA). The model includes solar and infrared radiation, heterogeneous chemistry, conduction in the solid absorber, and convection between the fluid and solid absorber. The predicted thermal and chemical conditions for typical operating conditions at the SNL solar furnace suggest that TCA can be destroyed in a DCAR. The temperature predictions agree well with currently available thermocouple data for heating carbon dioxide gas in the DCAR. Feasibility and scoping calculations show trichloroethane destruction efficiencies up to 99.9997 percent at a trichloroethane flow rate of 1.7 kg/hr may be obtainable with typical SNL solar furnace fluxes. Greater destruction efficiencies and greater destruction rates should be possible with higher solar fluxes. Improvements in reactor performance can be achieved by tailoring the absorber to alter the radial mass flux distribution in the absorber with the radial solar flux distribution. RP SKOCYPEC, RD (reprint author), SANDIA NATL LABS,DEPT THERMAL & FLUID ENGN,ALBUQUERQUE,NM 87185, USA. NR 10 TC 3 Z9 3 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD FEB PY 1994 VL 116 IS 1 BP 14 EP 18 DI 10.1115/1.2930058 PG 5 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA MZ250 UT WOS:A1994MZ25000003 ER PT J AU DABROWSKI, B ZHANGMACCOY, V WANG, Z HANNON, R JORGENSEN, JD HUNTER, BA HINKS, DG WAGNER, JL HITTERMAN, RL AF DABROWSKI, B ZHANGMACCOY, V WANG, Z HANNON, R JORGENSEN, JD HUNTER, BA HINKS, DG WAGNER, JL HITTERMAN, RL TI HIGH OXYGEN-PRESSURE SYNTHESIS OF NEW COPPER-OXIDE SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE LA2CUO4; HIGH PRESSURE; LA-CA-CU-O; Y-SR-LA-CU-O; OXYGEN PRESSURE AB The unique coordination of the copper ions in +1, +2, and +3 oxidation states, which are stable in a range of oxygen partial pressure, 10(-6) < P(O2) < 10(3) atm, makes possible the formation of a wide variety of distinct structures. By controlling the oxygen pressure during the synthesis and annealing, the distribution of metal and oxygen ions can be modified on an atomic scale to optimize the structural and electronic properties. We present several examples of compounds for which the critical structural elements for superconductivity, i.e., the perfectly ordered CuO2 planes, have been obtained and doped with holes by means of high oxygen pressure, P(O2) > 1 atm. These materials, La2CuO4+delta, La2-xCaxCuO4, and YSr2-xLaxCu3O7+delta, offer a unique opportunity to study the relationship between superconductivity and structural, magnetic, and chemical properties. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DABROWSKI, B (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 45 EP 48 DI 10.1007/BF00730366 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800009 ER PT J AU MAPLE, MB ALMASAN, CC SEAMAN, CL HAN, SH YOSHIARA, K BUCHGEISTER, M PAULIUS, LM LEE, BW GAJEWSKI, DA JARDIM, RF FINCHER, CR BLANCHET, GB GUERTIN, RP AF MAPLE, MB ALMASAN, CC SEAMAN, CL HAN, SH YOSHIARA, K BUCHGEISTER, M PAULIUS, LM LEE, BW GAJEWSKI, DA JARDIM, RF FINCHER, CR BLANCHET, GB GUERTIN, RP TI EXTRAORDINARY BEHAVIOR OF THE Y1-XPRXBA2CU3O7-DELTA SYSTEM SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE Y1-XPRXBA2CU3O7-DELTA; Y1-XMXBA2CU3O7-DELTA; HALL EFFECT; MAGNETORESISTANCE ID UPPER CRITICAL-FIELD; DOPED SUPERCONDUCTOR SM1.85CE0.15CUO4-Y; SINGLE-CRYSTAL YBA2CU3O7-X; APPLIED MAGNETIC-FIELDS; IRREVERSIBILITY LINE; PRESSURE-DEPENDENCE; TRANSITION-TEMPERATURE; PAIR BREAKING; TC; HALL AB Investigations of Y1-xMxBa2Cu3O7-delta (M = Ce, Th) c-axis oriented thin film specimens show that the rate of depression of T(c) with x is larger for M = Th, than for M = Ce and Pr, and suggest that Ce, like Th, is tetravalent in this compound. Hall effect measurements on Y1-xPrxBa2Cu3O7-delta single crystals reveal a T2 dependence of the cotangent of the Hall angle in the normal state and a ''negative Hall anomaly'' below T(c) in the superconducting state, in agreement with recent reports. Our research shows that the depth, DELTA, of the negative Hall signal scales with T/T(c) and that the maximum value of DELTA decreases linearly with x and vanishes at x almost-equal-to 0.24. Magnetoresistance measurements on Y1-xPrBa2Cu3O7-delta single crystals indicate that the irreversibility line H(T*) obeys a universal scaling relation characterized by an m = 3/2 power law near T(c), with a crossover to a more rapid temperature dependence of below T/T(c) almost-equal-to 0.6, similar to that observed for polycrystalline specimens. C1 UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87544. DUPONT CO INC,CENT RES DEPT,WILMINGTON,DE 19880. TUFTS UNIV,DEPT PHYS,MEDFORD,MA 02155. MITSUBISHI ELECTR CORP,SAGAMIHARA,KANAGAWA,JAPAN. UNIV SAO PAULO,INST FIS,BR-20516 SAO PAULO,BRAZIL. RP MAPLE, MB (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. RI Jardim, Renato/J-8068-2014 OI Jardim, Renato/0000-0002-2000-0257 NR 56 TC 32 Z9 32 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 97 EP 106 DI 10.1007/BF00730377 PG 10 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800020 ER PT J AU JORGENSEN, JD RADAELLI, PG SHAKED, H WAGNER, JL HUNTER, BA MITCHELL, JF HITTERMAN, RL HINKS, DG AF JORGENSEN, JD RADAELLI, PG SHAKED, H WAGNER, JL HUNTER, BA MITCHELL, JF HITTERMAN, RL HINKS, DG TI ROLES OF OXYGEN DEFECTS IN COPPER-OXIDE SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE OXYGEN DEFECTS; INTERSTITIAL OXYGEN; DOPING; NEUTRON DIFFRACTION; OXYGEN VACANCY ID MAGNETIC-PROPERTIES; LA2CUO4+DELTA; PHASE AB Oxygen vacancy and interstitial defects can have a profound effect on the superconducting properties of copper oxide compounds. Recent work on compounds such as La2CuO4+x and HgBa2CuO4+x has provided new insight into the role of interstitial oxygen defects as a doping mechanism. The number of carriers created by each interstitial defect depends on the local defect structure. Studies of (La, Sr, Ca)3Cu2O6+x with various metal compositions and metal-site ordering show that interstitial oxygen defects that form between the CuO2 layers in this structure systematically lower T(c) and eventually destroy superconductivity. Conversely, oxygen vacancies in the CuO2 planes have surprisingly little effect at concentrations below 3%. The infinite-layer compounds, ACuO2, where A = La, Sr, Ca, Nd, etc., in solid-solution combinations, could offer a similar environment for the formation of interstitial oxygen defects between the CuO2 planes, allowing interstitial oxygen defects to contribute to the doping of these compounds. However, neutron diffraction experiments on Sr0.9La0.1CuO2 (T(c) = 42 K) have not found any interstitial oxygen. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,ARGONNE,IL 60439. RP JORGENSEN, JD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 17 TC 5 Z9 5 U1 2 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 145 EP 149 DI 10.1007/BF00730385 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800028 ER PT J AU WELP, U GRIMSDITCH, M FLESHLER, S NESSLER, W VEAL, B CRABTREE, GW AF WELP, U GRIMSDITCH, M FLESHLER, S NESSLER, W VEAL, B CRABTREE, GW TI ANISOTROPIC UNIAXIAL PRESSURE EFFECTS IN YBA2CU3O7-DELTA SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE UNIAXIAL PRESSURE DEPENDENCE; YBA2CU3O7-DELTA; RESISTIVITY ID OXYGEN-DEFICIENT YBA2CU3O7-DELTA; SINGLE-CRYSTALS; CHARGE-TRANSFER; TC; DIFFRACTION; DEPENDENCE; STRESS AB We present measurements of the uniaxial pressure dependence of T(c) of untwinned YBa2Cu3O7-delta crystals with various oxygen stoichiometries. For all samples investigated, T(c) decreases for pressure along a, increases for pressure along b, and, in oxygen deficient samples, increases strongly for pressure along c. These results are compared to the behavior found in the La2-xSrCuO4 and YBa2Cu4O8 systems. Neither the model of pressure-induced charge transfer nor coupling to orthorhombic distortions can explain all the data. However, the presence of singularities in the electronic density of states close to the Fermi energy is a possible origin of the observed behavior. Our preliminary data on the pressure dependence of the c-axis and in-plane resistivities in twinned crystals are consistent with this view. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,ARGONNE,IL 60439. RP WELP, U (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 30 TC 29 Z9 29 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 159 EP 164 DI 10.1007/BF00730387 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800030 ER PT J AU HOWELL, RH STERNE, PA FLUSS, MJ KAISER, JH KITAZAWA, K KOJIMA, H AF HOWELL, RH STERNE, PA FLUSS, MJ KAISER, JH KITAZAWA, K KOJIMA, H TI INFLUENCE OF DOPING ON THE ELECTRONIC-STRUCTURE OF (LA,SR)2CUO4 SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE LA2-XSRXCUO4; POSITRON ANNIHILATION; ACAR; FERMI SURFACE; SR DOPING; ELECTRONIC STRUCTURE ID FERMI-SURFACE; YBA2CU3O7-DELTA AB High-statistics (>4 x 10(8) counts), room-temperature measurements of the electron-positron momentum density of La2-xSrxCuO4 have been performed for samples with Sr concentrations of x = 0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV TEXAS,ARLINGTON,TX 76019. UNIV TOKYO,TOKYO 113,JAPAN. YAMANASHI UNIV,KOFU,YAMANASHI 400,JAPAN. RP HOWELL, RH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 169 EP 173 DI 10.1007/BF00730389 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800032 ER PT J AU BOZOVIC, I ECKSTEIN, JN VIRSHUP, GF CHAIKEN, A WALL, M HOWELL, R FLUSS, M AF BOZOVIC, I ECKSTEIN, JN VIRSHUP, GF CHAIKEN, A WALL, M HOWELL, R FLUSS, M TI ATOMIC-LAYER ENGINEERING OF CUPRATE SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE THIN FILMS; BISRCACUO; ATOMIC-LAYER GROWTH; TRILAYER JOSEPHSON JUNCTIONS ID MOLECULAR-BEAM EPITAXY; SINGLE-CRYSTAL FILMS; THIN-FILMS; OXIDE SUPERCONDUCTORS; GROWTH; SUPERLATTICES AB A technique for atomic layer-by-layer synthesis of cuprate superconductors and other complex oxides has been developed. Thin films with excellent transport properties and atomically flat surfaces and interfaces are obtained. The samples are engineered by stacking molecular layers of different compounds to assemble multilayers and superlattices, by adding or omitting atomic monolayers to create novel compounds, and by doping within specified atomic monolayers to fabricate, for the first time, intra-cell barriers. Apart from manufacturing trilayer Josephson junctions with I(c)R(n) > 5 mV, this technique enables one to customize both the materials and the devices according to the needs of a specific experiment. A number of fundamental issues, such as the dimensionality of the HTSC state, existence of long-range proximity effects, occurrence of resonant tunneling with a specified number of hops, etc., have been addressed in this way. Synthesis of the first ''artificial'' metastable HTSC compounds is also reported. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BOZOVIC, I (reprint author), VARIAN ASSOCIATES INC,EL GINZTON RES CTR,PALO ALTO,CA 94303, USA. NR 29 TC 56 Z9 56 U1 2 U2 12 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 187 EP 195 DI 10.1007/BF00730392 PG 9 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800035 ER PT J AU REEVES, ME KRESIN, VZ WOLF, SA AF REEVES, ME KRESIN, VZ WOLF, SA TI THERMODYNAMIC DETERMINATION OF THE ELECTRON-PHONON COUPLING STRENGTH IN YBA2CU3O7-DELTA SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE CU-O PLANES; CU-O CHAINS; ELECTRON-PHONON COUPLING; SPECIFIC HEAT ID UPPER CRITICAL-FIELD; SUPERCONDUCTORS; TEMPERATURE; TC; PARAMETERS; HEAT AB The relative enthalpy of YBa2Cu3O7-delta has been measured between the temperatures 273 and 700 K. From these data, we find that the electronic contribution to the specific heat is linear in temperature with a Sommerfeld constant of 25 +/- 3 mJ/mole . K2. We analyze the data to show that the normal state of YBa2Cu3O7-delta is described by two conduction bands and strong electron-phonon coupling. The electron-phonon coupling is, in fact, sufficient to account for the high T(c) in YBa2CuO7-delta. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP REEVES, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 29 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 257 EP 259 DI 10.1007/BF00730407 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800050 ER PT J AU RULAND, RE AF RULAND, RE TI SURVEY AND ALIGNMENT OF PARTICLE ACCELERATORS AND TRANSPORT LINES SO JOURNAL OF SURVEYING ENGINEERING-ASCE LA English DT Article AB The present paper summarizes the survey and alignment processes of accelerators and transport lines and discusses the propagation of errors associated with these processes. The major geodetic principles governing the survey and alignment measurement space are revisited and their relationship to a lattice coordinate system shown. The paper continues with a broad overview about the activities involved in the step by step sequence from initial absolute alignment to final smoothing. Emphasis is given to the relative alignment of components, in particular to the importance of incorporating methods to remove residual systematic effects in surveying and alignment operations. RP RULAND, RE (reprint author), STANFORD LINEAR ACCELERATOR CTR,MAIL STOP 21,SLAC POB 4349,STANFORD,CA 94309, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9453 J9 J SURV ENG-ASCE JI J. Surv. Eng.-ASCE PD FEB PY 1994 VL 120 IS 1 BP 11 EP 24 DI 10.1061/(ASCE)0733-9453(1994)120:1(11) PG 14 WC Engineering, Civil SC Engineering GA MT448 UT WOS:A1994MT44800003 ER PT J AU HANDWERKER, CA CANNON, RM FRENCH, RH AF HANDWERKER, CA CANNON, RM FRENCH, RH TI COBLE,ROBERT,L - A RETROSPECTIVE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Item About an Individual C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. DUPONT CO INC,CENT RES,WILMINGTON,DE 19880. RP HANDWERKER, CA (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. RI French, Roger/E-1986-2011 OI French, Roger/0000-0002-6162-0532 NR 0 TC 2 Z9 2 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD FEB PY 1994 VL 77 IS 2 BP 293 EP 297 DI 10.1111/j.1151-2916.1994.tb06995.x PG 5 WC Materials Science, Ceramics SC Materials Science GA MW701 UT WOS:A1994MW70100002 ER PT J AU LAGERLOF, KPD HEUER, AH CASTAING, J RIVIERE, JP MITCHELL, TE AF LAGERLOF, KPD HEUER, AH CASTAING, J RIVIERE, JP MITCHELL, TE TI SLIP AND TWINNING IN SAPPHIRE (ALPHA-AL2O3) SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article; Proceedings Paper CT International Workshop on the Science of Alumina CY MAR 15-19, 1993 CL SCHLOSS RINGBERG, GERMANY SP MAX PLANCK INST METALLFORSCH ID PLASTIC-DEFORMATION; DISLOCATION; DIFFUSION AB The plastic deformation of sapphire (alpha-Al2O3) has been studied under hydrostatic confining pressure at temperatures below the ambient pressure brittle-to-ductile transition temperature. Samples oriented for prism plane slip (Type I samples) were deformed via dislocation slip at temperatures as low as 200 degrees C. Samples oriented for basal slip (Type II samples) could be plastically deformed at temperatures as low as 400 degrees C but showed more complicated deformation behavior, inasmuch as the sample orientation also allowed for the activation of basal twinning and two of the three rhombohedral twin systems. The temperature dependence of the critical resolved shear stress tau(crss), In tau(crss) = In tau(O) - B.T for basal slip was significantly greater than that for prism plane slip (B-basal > B-prism plane ), causing the latter system to be the easy slip system below approximate to 600 degrees C (basal slip is the easy slip system at elevated temperatures). Type II samples deformed primarily by basal twinning in preference to both rhombohedral twinning and basal slip. The different temperature dependence of tau(crss) for basal and prism plane slip is attributed to details of the dislocation core structure; prism plane dislocations, having a large Burgers vector (\bpp\ = 0.822 nm), can dissociate into three collinear partials (\bp\ = 0.274 nm) separated by relatively low-energy stacking faults, whereas the comparable dissociation of basal dislocations(\b(B)\ = 0.476 nm) produces two noncollinear partials separated by a relatively high energy stacking fault. Thus, dissociation of basal dislocations is most likely restricted to the dislocation core, which is manifested in a higher Peierls stress at low temperatures for basal slip compared to prism plane slip. C1 LAB PHYS MAT,CNRS BELLEVUE,F-92195 MEUDON,FRANCE. LOS ALAMOS NATL LAB,CTR MAT RES,LOS ALAMOS,NM 87545. RP LAGERLOF, KPD (reprint author), CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106, USA. NR 48 TC 126 Z9 127 U1 2 U2 29 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD FEB PY 1994 VL 77 IS 2 BP 385 EP 397 DI 10.1111/j.1151-2916.1994.tb07006.x PG 13 WC Materials Science, Ceramics SC Materials Science GA MW701 UT WOS:A1994MW70100013 ER PT J AU ELLIS, DE GUO, J LAM, DJ AF ELLIS, DE GUO, J LAM, DJ TI CLUSTER-MODELS OF BULK, SURFACE, AND IMPURITY STRUCTURE IN ALPHA-ALUMINA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID DENSITY-FUNCTIONAL THEORY; ELECTRONIC-STRUCTURE; CHARGE-DISTRIBUTIONS; MOLECULAR-DYNAMICS; DEFECT STRUCTURE; SAPPHIRE; COPPER; ENERGY; ALPHA-AL2O3; RUBY AB Self-consistent field embedded cluster models have been used to study the electronic structure of bulk, surface, and impurity regions of alpha-alumina, Al2O3. First principles local density (LD) theory is used to make an expansion of one-electron wave functions in a linear combination of atomic orbitals which permits direct interpretation of bonding and effective atomic configurations. The clusters are embedded self-consistently in the host lattice, so that all long-range potential effects are properly included. The LD calculations give a reasonably good account of bulk cohesion and bond length; relative energies of several cleavage faces are predicted. The nature of surface states for different terminating surfaces is examined, and results of partial relaxation ''experiments'' are reported. Local densities of state of Ti, Cr, and Fe substitutional impurities are discussed. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP NORTHWESTERN UNIV, DEPT PHYS & ASTRON, EVANSTON, IL 60208 USA. NR 34 TC 23 Z9 23 U1 0 U2 3 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0002-7820 EI 1551-2916 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD FEB PY 1994 VL 77 IS 2 BP 398 EP 403 DI 10.1111/j.1151-2916.1994.tb07007.x PG 6 WC Materials Science, Ceramics SC Materials Science GA MW701 UT WOS:A1994MW70100014 ER PT J AU LIU, AC VERSTUYFT, JG RUBIN, EM LAWN, RM AF LIU, AC VERSTUYFT, JG RUBIN, EM LAWN, RM TI INHIBITION OF ATHEROGENESIS IN APOLIPOPROTEIN(A) MICE BY THE ADDITION OF APOLIPOPROTEIN AL TRANSGENE SO JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY LA English DT Meeting Abstract C1 DIV CARDIOVASC MED,STANFORD,CA. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0735-1097 J9 J AM COLL CARDIOL JI J. Am. Coll. Cardiol. PD FEB PY 1994 SI SI BP A216 EP A216 PG 1 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA PP518 UT WOS:A1994PP51800851 ER PT J AU BOGGESS, B COOK, KD AF BOGGESS, B COOK, KD TI DETERMINATION OF FLUX FROM A SADDLE FIELD FAST-ATOM-BOMBARDMENT GUN SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID ION MASS-SPECTROMETRY; REDUCTION PROCESSES; METHYLENE-BLUE; ORGANIC-DYES; SPECTRA; MATRIX; FAB; GLYCEROL; SIMS AB The flux or beam density (equivalent current/area) of xenon atoms striking the sample target from a saddle field fast-atom bombardment (FAB) gun has been compared with that from a cesium ion gun mounted on the same instrument. A shielded Faraday cup mounted on the end of a solids probe was used to measure directly the flux of the Cs+ beam. Samples of methylene blue in glycerol solution were then exposed to the ion beam at different fluxes and the extents of reduction were measured. The extent of reduction varied linearly with flux up to a value of about 1.16 X 10(13) particles s-1 cm-2 (1.85 muA cm-2); above this level, the reduction effect appeared to saturate. FAB spectra were obtained from the same dye solution by using varying settings of the FAB gun. By comparing the extents of reduction of the dye from the two guns, the flux from the atom gun could be estimated. Observation of luminescence from a CsI-coated target allowed estimation of the area of the atom beam. The atom beam ''equivalent current'' could then be calculated by multiplying the flux times the area. It was noted that for given settings, the flux from the atom gun depended on the physical condition of the gun electrodes. With new electrodes, a flux greater-than-or-equal-to 1.16 X 10(13) particles s-1 cm-2 was obtained with nominal gun emission currents of 0.60-1.0 mA. Electrodes used extensively, but freshly cleaned, provided a flux of approximately 8 X 10(12) particles s-1 cm-2 at nominal emission currents of 0.40-1.0 mA. With dirty electrodes this flux could only be achieved at the highest (1.0 mA) emission current. This decline in performance occurs over a matter of months as a result of contamination and erosion of the electrodes during use. Such behavior can adversely affect spectral reproducibility even when nominal FAB gun voltage and emission current are carefully reproduced. C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,DEPT CHEM,OAK RIDGE,TN 37830. OI Cook, Kelsey/0000-0003-2053-3309 NR 27 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD FEB PY 1994 VL 5 IS 2 BP 100 EP 105 DI 10.1016/1044-0305(94)85041-0 PG 6 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA MX063 UT WOS:A1994MX06300006 PM 24222520 ER PT J AU VIECELLI, JA AF VIECELLI, JA TI PERSISTENCE OF LAGRANGIAN TRAJECTORIES IN ROTATING 2-DIMENSIONAL TURBULENCE SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID 2-DIMENSIONAL TURBULENCE; DYNAMICS AB The normal temperature two-dimensional turbulent flow associated with the inviscid advection of a set of vortices of like sign and strength consists of random clusters of vorticity that orbit about a common center of rotation along random tracks. This flow has similarities with the extratropical atmospheric circulation, including an omega(-3) spectral region, enhanced scale-dependent diffusion, and a time-averaged azimuthal velocity variation with distance from the rotation axis similar to that of the zonal wind field. Power-law correlations between the fluctuations in the individual vortex orbit radii are present; specifically, the orbit radii spectrum has an omega(-1/3) low-frequency asymptote, and an autocorrelation function with a t(-2/3) tail. The slow asymptotic decay of the tail implies long-time memory and the feasibility of extended range statistical forecasting based on causal autoregression methods. Test forecasts of the fluctuations in the vortex orbit radii are in agreement with the expectations of autoregression theory. RP VIECELLI, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,MAIL STOP L-294,LIVERMORE,CA 94550, USA. NR 40 TC 4 Z9 4 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD FEB 1 PY 1994 VL 51 IS 3 BP 337 EP 352 DI 10.1175/1520-0469(1994)051<0337:POLTIR>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MV876 UT WOS:A1994MV87600001 ER PT J AU GHEORGHITA, L COCIVERA, M NELSON, AJ SWARTZLANDER, AB AF GHEORGHITA, L COCIVERA, M NELSON, AJ SWARTZLANDER, AB TI FORMATION OF A SILVER-RICH SURFACE-LAYER ON ELECTRODEPOSITED CDTE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID CDS/CDTE SOLAR-CELLS; PHOTOVOLTAIC PROPERTIES; TELLURIDE; PHASE; HGCDTE AB CdTe thin films were electrodeposited using a nonaqueous solution of propylene carbonate at elevated temperatures (i.e., 95 to 105-degrees-C) and treated with solutions of silver trifluoromethanesulfonate. The silver content of films treated electrochemically with silver salt solution exhibited very little dependence on the applied current density or the silver ion concentration when a constant current was applied for 5 min. Furthermore, if the film was immersed in the silver salt solution for the same length of time with no current applied, the silver content in the film was very nearly the same as that for the electrochemically treated films. These results indicate that the electrochemical treatment has a minimal effect on the incorporation of silver into the film. The silver content in the film reached saturation after a 5 min treatment. The location of the silver in the film as determined by Auger spectroscopy compositional depth profile indicated that the silver was incorporated mainly at the surface of the film in the form of AgxCd(1-x)Te although a small amount of silver penetrated deeply into the film. X-ray photoelectron spectroscopy data supported these conclusions. Hall and resistivity data revealed that the carrier transport properties changed markedly when the silver-rich AgxCd(1-x)Te layer coated the surface. A change in the sign of the Hall coefficient as a function of temperature was observed and was explained in terms of the small bandgap of silver telluride and the different temperature dependence of the electron and hole mobilities. C1 NATL RENEWABLE ENERGY LABS,GOLDEN,CO 80401. RP GHEORGHITA, L (reprint author), UNIV GUELPH,GUELPH WATERLOO CTR GRAD WORK CHEM,GUELPH N1G 2W1,ONTARIO,CANADA. NR 22 TC 6 Z9 6 U1 0 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD FEB PY 1994 VL 141 IS 2 BP 529 EP 535 DI 10.1149/1.2054760 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NA654 UT WOS:A1994NA65400041 ER PT J AU MAX, CE AVICOLA, K BRASE, JM FRIEDMAN, HW BISSINGER, HD DUFF, J GAVEL, DT HORTON, JA KIEFER, R MORRIS, JR OLIVIER, SS PRESTA, RW RAPP, DA SALMON, JT WALTJEN, KE AF MAX, CE AVICOLA, K BRASE, JM FRIEDMAN, HW BISSINGER, HD DUFF, J GAVEL, DT HORTON, JA KIEFER, R MORRIS, JR OLIVIER, SS PRESTA, RW RAPP, DA SALMON, JT WALTJEN, KE TI DESIGN, LAYOUT, AND EARLY RESULTS OF A FEASIBILITY EXPERIMENT FOR SODIUM-LAYER LASER-GUIDE-STAR ADAPTIVE OPTICS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SYNTHETIC BEACON; LIDAR AB We describe the design and the early results of a feasibility experiment for sodium-layer laser-guide-star adaptive optics. Copper-vapor-laser-pumped dye lasers from Lawrence Livermore National Laboratory's Atomic Vapor Laser Isotope Separation program are used to create the guide star. The laser beam is projected upward from a beam director that is located similar to 5 m from a 0.5-m telescope and forms an irradiance spot similar to 2 m in diameter at the atmospheric-sodium layer (at an altitude of 95 km). The laser guide star is approximately fifth magnitude and is visible to the naked eye at the top of the Rayleigh-scattered laser beam. To date, we have made photometric measurements and open-loop wave-front-sensor measurements of the laser guide star. We give an overview of the experiment's design and the laser systems, describe the experimental setup, show preliminary photometric and open-loop wave-front-sensor data on the guide star, and present predictions of closed-loop adaptive-optics performance based on these experimental data. The long-term goal of this effort is to develop laser guide stars and adaptive optics for use with large astronomical telescopes. RP MAX, CE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. OI Max, Claire/0000-0003-0682-5436 NR 30 TC 23 Z9 23 U1 1 U2 9 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 813 EP 824 DI 10.1364/JOSAA.11.000813 PG 12 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100041 ER PT J AU AVICOLA, K BRASE, JM MORRIS, JR BISSINGER, HD DUFF, JM FRIEDMAN, HW GAVEL, DT MAX, CE OLIVIER, SS PRESTA, RW RAPP, DA SALMON, JT WALTJEN, KE AF AVICOLA, K BRASE, JM MORRIS, JR BISSINGER, HD DUFF, JM FRIEDMAN, HW GAVEL, DT MAX, CE OLIVIER, SS PRESTA, RW RAPP, DA SALMON, JT WALTJEN, KE TI SODIUM-LAYER LASER-GUIDE-STAR EXPERIMENTAL RESULTS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article AB We describe a series of experiments to characterize the sodium-layer guide star that was formed with the high-power laser developed for the Lawrence Livermore National Laboratory Atomic Vapor Laser Isotope Separation program. An emission spot size of 3.0 m was measured, with an implied laser irradiance spot diameter of 2.0 m. The rms spot motion at the higher laser powers, with active beam-pointing control, was less than 0.5 arcsec and had little effect on the observed spot size under these conditions. We measured the resonant backscatter from the sodium layer as a function of laser power to obtain a saturation curve. With a transmitted power of 1100 W and an atmospheric transmission of 0.6, the irradiance from the guide star at the ground was 10 (photons/cm(2))/ms, corresponding to a visual magnitude of 5.1. The implications for the performance of wave-front sensors with a laser guide star of this magnitude and resulting closed-loop adaptive-optics performance are discussed. RP AVICOLA, K (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. OI Max, Claire/0000-0003-0682-5436 NR 13 TC 26 Z9 28 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 825 EP 831 DI 10.1364/JOSAA.11.000825 PG 7 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100042 ER PT J AU MORRIS, JR AF MORRIS, JR TI EFFICIENT EXCITATION OF A MESOSPHERIC SODIUM LASER GUIDE STAR BY INTERMEDIATE-DURATION PULSES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID ADAPTIVE OPTICS; SYNTHETIC BEACON; 2-LEVEL ATOM; LIDAR; TELESCOPE; LAYER; COMPENSATION; PERFORMANCE; ASTRONOMY; ILLINOIS AB Calculations of backscatter emission of mesospheric sodium atoms in a laser guide star that is excited by pulses ranging from 30-ns to 0.9-mu s duration are described. The efficient use of such pulses at saturating irradiance values is shown to require similar to 3 GHz of spectral broadening to provide access to the full absorption spectrum of the D-2 line. The broadening is provided by frequency modulation. A set of density matrices was used to account for all 24 hyperfine states and inhomogeneous Doppler broadening. At the broadband (3-GHz) saturation irradiance of 4 W/cm(2), both linearly and circularly polarized laser beams are shown to produce emission rates exceeding 60% of the maximum possible rate-equation rate for the 0.9-mu s pulses. As expected, circular polarization produced more backscatter than did linear polarization, but the enhancement never exceeded 1/3 in the calculations that are reported. A brief estimate of state precession in the Earth's magnetic field suggests that achieving even this enhancement will require that the time scale for optical pumping be held to less than 1 mu s, which will require the use of irradiances greater than 0.7 W/cm(2) and spectral coverage of the full 3-GHz hyperfine-plus-Doppler absorption profile, at least until most of the population is pumped out of the F = 1 ground states. RP MORRIS, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 43 TC 45 Z9 48 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 832 EP 845 DI 10.1364/JOSAA.11.000832 PG 14 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100043 ER PT J AU GAVEL, DT MORRIS, JR VERNON, RG AF GAVEL, DT MORRIS, JR VERNON, RG TI SYSTEMATIC DESIGN AND ANALYSIS OF LASER-GUIDE-STAR ADAPTIVE-OPTICS SYSTEMS FOR LARGE TELESCOPES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID FRANCE-HAWAII TELESCOPE; PERFORMANCE ANALYSIS; IMAGE-STABILIZATION; ANISOPLANATISM AB We discuss the design of laser-guided adaptive-optics systems for the large, 8-10-m-class telescopes. Through proper choice of system components and optimized system design, the laser power that is needed at the astronomical site can be kept to a minimum. C1 SCI APPLICAT INT CORP,PALM BEACH GARDENS,FL 33410. RP GAVEL, DT (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 37 TC 12 Z9 14 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 914 EP 924 DI 10.1364/JOSAA.11.000914 PG 11 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100051 ER PT J AU DELOACH, LD PAYNE, SA SMITH, LK KWAY, WL KRUPKE, WF AF DELOACH, LD PAYNE, SA SMITH, LK KWAY, WL KRUPKE, WF TI LASER AND SPECTROSCOPIC PROPERTIES OF SR-5(PO4)(3)F-YB SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article AB Sr-5(PO4)(3)F (S-FAP) has been investigated as a new Yb-doped laser crystal belonging to the apatite structural family. The spectroscopy of the Yb3+ ion and the laser properties of the medium have been investigated. The maximum absorption cross section of Yb in S-FAP is 8.6 x 10(-20) cm(2), and the maximum emission cross section is 7.3 x 10(-20) cm(2). The measured emission lifetime of Yb3+ is 1.26 ms. An Yb:S-FAP laser has been demonstrated with a Ti:sapphire laser pump operating at 899 nn. The Yb:S-FAP laser was measured to have slope efficiencies as high as 71%. The spectroscopy and laser studies are reported, as well as certain thermal, mechanical, and optical properties. RP DELOACH, LD (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 23 TC 147 Z9 150 U1 3 U2 15 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD FEB PY 1994 VL 11 IS 2 BP 269 EP 276 DI 10.1364/JOSAB.11.000269 PG 8 WC Optics SC Optics GA MX451 UT WOS:A1994MX45100001 ER PT J AU HERLEY, PJ WANG, CS VARSI, G LEVY, PW AF HERLEY, PJ WANG, CS VARSI, G LEVY, PW TI THE EFFECTS OF FAST-NEUTRON, GAMMA-RAY AND COMBINED RADIATIONS ON THE THERMAL-DECOMPOSITION OF AMMONIUM-PERCHLORATE POWDER ALUMINUM PARTICLE MIXTURES SO JOURNAL OF THERMAL ANALYSIS LA English DT Article DE AMMONIUM PERCHLORATE; KINETICS; RADIATION EFFECTS AB The thermal decomposition kinetics of irradiated and unirradiated ammonium perchlorate and ammonium perchlorate powder - aluminum particle mixtures has been studied by determining decomposition gas pressure vs. heating time with samples at a controlled temperature. Qualitatively the radiation induced changes are similar to those obtained in previous studies on 'pure' ammonium perchlorate. The induction period is shortened and the acceleratory and decay period rate constants are increased. The data have been analyzed using Avrami-Erofeev kinetics. The results for pure unirradiated material are in accord with published results. The activation energies for the induction, acceleratory and decay periods for pure pellets were found to be 133.5+/-6.7, 131.8+/-6.7 and 127.2+/-6.7 kJ.mol, respectively. Samples were exposed to either a single gamma-ray irradiation, fission neutron irradiation followed by a gamma-ray irradiation, or to a proton irradiation. When compared on an equal energy deposited basis, the fast neutron induced changes are appreciably larger than the gamma-ray changes. However, the proton induced changes are comparable or slightly more than the gamma-ray effects. Some, or all, of the fast neutron effects can be attributable to the concentrated radiation damage 'spikes' along the path of lattice atom recoils. It is likely that these become thermal decomposition sites when the crystals are heated. Protons create fewer spikes than fast neutrons. Overall, the results indicate that any ammonium perchlorate - aluminum propellant mixtures that may be exposed to radiation environments, such as used in this study, should be subjected to a thorough radiation effects analysis if reliable performance is required. C1 SUNY STONY BROOK,STONY BROOK,NY 11794. JET PROPULS LAB,PASADENA,CA 91103. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 16 TC 1 Z9 1 U1 1 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0368-4466 J9 J THERM ANAL JI J. Therm. Anal. PD FEB-MAR PY 1994 VL 41 IS 2-3 BP 435 EP 448 DI 10.1007/BF02549325 PG 14 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA NG203 UT WOS:A1994NG20300012 ER PT J AU HJELLE, B JENISON, S TORREZMARTINEZ, N YAMADA, T NOLTE, K ZUMWALT, R MACINNES, K MYERS, G AF HJELLE, B JENISON, S TORREZMARTINEZ, N YAMADA, T NOLTE, K ZUMWALT, R MACINNES, K MYERS, G TI A NOVEL HANTAVIRUS ASSOCIATED WITH AN OUTBREAK OF FATAL RESPIRATORY-DISEASE IN THE SOUTHWESTERN UNITED-STATES - EVOLUTIONARY RELATIONSHIPS TO KNOWN HANTAVIRUSES SO JOURNAL OF VIROLOGY LA English DT Article ID NEPHROPATHIA-EPIDEMICA AB Four Corners hantavirus (FCV) is the tentative name of the suspected etiologic agent of the newly identified hantavirus-associated respiratory distress syndrome (HARDS). The identification in HARDS patients of serum immunoglobulin M and immunoglobulin G antibodies that cross-reacted with Hantaan, Seoul, and Puumala virus antigens first suggested that FCV is a hantavirus. Limited nucleotide sequence data from the FCV glycoprotein-2 (G2) confirmed that FCV is a hantavirus and showed that it is most closely related to Prospect Hill and Puumala viruses. We have molecularly cloned approximately 95% of the sequences of the M and S segments of the FCV genome encoding the envelope glycoproteins and nucleocapsid protein N from the lungs of a patient with HARDS. The nucleotide sequence has been determined for 2,632 bases. The nucleotide sequence data show that FCV is a new member of the Puumala virus and Prospect Hill virus division of the hantavirus genus. Phylogenetic tree analyses indicate that the M and S segments have evolved in parallel. Therefore, the novel pathogenic activity of FCV is not likely to be the result of recent reassortment of segments from less pathogenic viruses. C1 UNIV NEW MEXICO,SCH MED,DEPT MED,ALBUQUERQUE,NM 87131. UNITED BLOOD SERV,ALBUQUERQUE,NM. OFF MED INVESTIGATOR,ALBUQUERQUE,NM. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM. RP HJELLE, B (reprint author), UNIV NEW MEXICO,SCH MED,DEPT PATHOL 337BRF,ALBUQUERQUE,NM 87131, USA. NR 18 TC 137 Z9 141 U1 1 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD FEB PY 1994 VL 68 IS 2 BP 592 EP 596 PG 5 WC Virology SC Virology GA MW252 UT WOS:A1994MW25200002 PM 8289363 ER PT J AU BRYUNETKIN, BA DYAKIN, VM NILSEN, J SKOBELEV, IY FAENOV, AY KHAKHALIN, SY AF BRYUNETKIN, BA DYAKIN, VM NILSEN, J SKOBELEV, IY FAENOV, AY KHAKHALIN, SY TI UTILIZATION OF LASER-PLASMA TO MEASURE THE RESONANCE DEFECT OF LY(ALPHA-1,2) LINES OF MG-XII AND 2S-3P LINES OF GE-XXIII SO KVANTOVAYA ELEKTRONIKA LA Russian DT Article ID SPECTROSCOPY; WAVELENGTHS; SPECTRA; IONS AB The wavelengths of satellites of the resonance line of a hydrogen-like MgXII ion have been precisely measured, as well as of some transitions in a neon-like GeXXIII ion and their satellites in plasma produced by a Nd-glass laser. A high-resolution large-aperture spectrograph with a mica crystal whose spherical surface had a curvature of radius R = 100 mm was used in measurements. The wavelength of the 2s(2)2p6 S-1(0) - 2s2p(6)3p P-3(1) transition in GeXXIII was measured to be equal to lambda = 842.08 +/- 0.09 pm. It was demonstrated that the shortwave component of the Lyman doublet in Mg XII (lambda = 841.92 pm) can be used for photopumping of a shortwave laser utilizing the transitions in a Ge XXIII ion. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. PN LEBEDEV PHYS INST,MOSCOW,RUSSIA. RP BRYUNETKIN, BA (reprint author), ALL RUSSIAN PHYSICOTECH & RADIOENGN MEASUREMENTS RES INST,MENDELEYEVSK,RUSSIA. NR 12 TC 4 Z9 4 U1 0 U2 0 PU LEBEDEV PHYSICAL INST KVANTOVAYA ELEKTRONIKA JOURNAL PI MOSCOW GSP-1 PA LENINSKII PROSPEKT 53, 117924 MOSCOW GSP-1, RUSSIA SN 0368-7147 J9 KVANTOVAYA ELEKTRON+ JI Kvantovaya Elektron. PD FEB PY 1994 VL 21 IS 2 BP 142 EP 146 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA NC529 UT WOS:A1994NC52900010 ER PT J AU VOGEL, P WEIGLER, BJ KERR, H HENDRICKX, AG BARRY, PA AF VOGEL, P WEIGLER, BJ KERR, H HENDRICKX, AG BARRY, PA TI SEROEPIDEMIOLOGIC STUDIES OF CYTOMEGALOVIRUS-INFECTION IN A BREEDING POPULATION OF RHESUS MACAQUES SO LABORATORY ANIMAL SCIENCE LA English DT Article ID IMMUNOGLOBULIN-M ANTIBODIES; LINKED IMMUNOSORBENT-ASSAY; VIRUS INFECTION; IMMUNODEFICIENCY; RADIOIMMUNOASSAY; DIAGNOSIS; MONKEYS; WOMEN; IGM AB A protein immunoblot (western blot) assay was developed for detection of IgG and IgM antibodies to cytomegalovirus (CMV) in banked serum and was used to study the epidemiology of infection in a breeding population of rhesus macaques. Ah juveniles and adults were antibody-positive to CMV. Repeated samples from 1990-born infants (n = 28) over a 12-month period allowed retrospective assessment of CMV seroconversion. Most infants (23 of 25 seroconversions) were apparently exposed to CMV during their first year of life. The IgM testing permitted identification of seroconversion time points in eight infants. Risk factors that significantly affected seroconversion probabilities in the study population were not found. Cytomegalovirus-free rhesus macaques are potentially valuable for viral teratology and pathogenesis research projects; however, present epidemiologic findings suggest that establishment of CMV-free colonies will be difficult in conventional settings. C1 N CAROLINA STATE UNIV,COLL VET MED,DEPT COMPAN ANIM & SPECIAL SPECIES MED,RALEIGH,NC 27606. LAWRENCE LIVERMORE NATL LAB,DEPT MED PATHOL,DAVIS,CA 95616. RP VOGEL, P (reprint author), CALIFORNIA REG PRIMATE RES CTR,DAVIS,CA 95616, USA. FU NCRR NIH HHS [RR00169] NR 28 TC 62 Z9 63 U1 0 U2 2 PU AMER ASSOC LABORATORY ANIMAL SCIENCE PI CORDOVA PA 70 TIMBERCREEK DR, SUITE 5, CORDOVA, TN 38018 SN 0023-6764 J9 LAB ANIM SCI JI Lab. Anim. Sci. PD FEB PY 1994 VL 44 IS 1 BP 25 EP 30 PG 6 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA NB052 UT WOS:A1994NB05200004 PM 8007656 ER PT J AU RHODES, OE CHESSER, RK AF RHODES, OE CHESSER, RK TI GENETIC CONCEPTS FOR HABITAT CONSERVATION - THE TRANSFER AND MAINTENANCE OF GENETIC-VARIATION SO LANDSCAPE AND URBAN PLANNING LA English DT Article; Proceedings Paper CT Management-Institutes 58th North-American Wildlife and Natural Resources Conference CY MAR 19-24, 1993 CL WASHINGTON, DC SP MANAGEMENT INST ID EFFECTIVE POPULATION-SIZE; CAPTIVE DROSOPHILA POPULATIONS; INBREEDING FINITE POPULATIONS; OVERLAPPING GENERATIONS; METAPOPULATION DYNAMICS; MODELING PROBLEMS; FRAGMENTATION; CONSEQUENCES; DIVERSITY AB The urgent need to integrate evolutionary theory into applied habitat management and land-use planning endeavors has become a focus for much conservation and biodiversity related research. Only recently have scientists begun to incorporate a holistic ecosystem approach, focusing on relationships among plant and animal resources rather than on individual species, into their management philosophies. Swept up in these emerging efforts to sustain biological diversity and functional ecosystems, genetic concepts have been incorporated into habitat management with an alarming mixture of excellence, generalization, and unfortunately even misconception. This does not imply that evolutionary theory has no bearing on the applied sciences but rather that more attention must be given to the interface between theoretical and applied research. The need to integrate genetic theory into ongoing conservation and management efforts is clear; however, much controversy remains as to how this integration may be accomplished for individual management situations. For vertebrates, the transfer of genetic information between generations or within and among various breeding components of populations is inextricably linked to the ecosystem in which they exist. Changes in the structure of an ecosystem can and must influence the ecology of its component species to some extent. However, genetic consequences resulting from changes in the ecology of species or species complexes are not clearly understood. Undoubtedly, alterations in the transfer and conservation of genetic information occur concomitantly with large-scale changes in the landscape. It is likely that these small undetected changes at the genetic level impact species to a similar extent as larger more obvious landscape level factors. In this work we will discuss concepts that are integral to the long-term existence of organisms in managed landscapes and to maintenance of gene diversity in general. Specifically, we will focus on the concept of effective population size, confusion associated with this concept, and its applicability to the maintenance of biologically diverse and sustainable landscapes. RP RHODES, OE (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 56 TC 6 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-2046 J9 LANDSCAPE URBAN PLAN JI Landsc. Urban Plan. PD FEB PY 1994 VL 28 IS 1 BP 55 EP 62 DI 10.1016/0169-2046(94)90043-4 PG 8 WC Ecology; Environmental Studies; Geography; Geography, Physical; Urban Studies SC Environmental Sciences & Ecology; Geography; Physical Geography; Urban Studies GA NA386 UT WOS:A1994NA38600006 ER PT J AU LIU, GY SALMERON, MB AF LIU, GY SALMERON, MB TI REVERSIBLE DISPLACEMENT OF CHEMISORBED N-ALKANETHIOL MOLECULES ON AU(111) SURFACE - AN ATOMIC-FORCE MICROSCOPY STUDY SO LANGMUIR LA English DT Letter ID GOLD SURFACES; DIFFRACTION; MONOLAYERS; FILMS AB Atomic force microscopy has been used to study the structure and the stability of CH3(CH2)9SH and CH3(CH2)17SH molecules self-assembled on a Au(111) surface as a function of the load applied by the tip. Atomic resolution images taken during a loading and unloading cycle have revealed two sudden transitions corresponding to changes of the periodicity from a (square-root 3 x square-root 3)R30-degrees (due to thiol layers) to a (1 x 1) (due to Au(111)), and back to the (square-root 3 x square-root 3)R30-degrees of thiol layers. These results represent the first observation that under high load, self-assembled n-alkanethiol molecules on Au(111) can be reversibly displaced on the substrate surface by a sharp tip during the scan. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 16 TC 138 Z9 141 U1 0 U2 18 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD FEB PY 1994 VL 10 IS 2 BP 367 EP 370 DI 10.1021/la00014a006 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MY212 UT WOS:A1994MY21200006 ER PT J AU BURTON, HD AF BURTON, HD TI A MATTER OF CHOICES - MEMOIRS OF A FEMALE PHYSICIST - AJZENBERGSELOVE,F SO LIBRARY JOURNAL LA English DT Book Review RP BURTON, HD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BOWKER MAGAZINE GROUP CAHNERS MAGAZINE DIVISION PI NEW YORK PA 249 W 17TH ST, NEW YORK, NY 10011 SN 0363-0277 J9 LIBR J JI Libr. J. PD FEB 1 PY 1994 VL 119 IS 2 BP 86 EP 86 PG 1 WC Information Science & Library Science SC Information Science & Library Science GA MU635 UT WOS:A1994MU63500078 ER PT J AU FU, YG BUSING, WR JIN, YM AFFHOLTER, KA WUNDERLICH, B AF FU, YG BUSING, WR JIN, YM AFFHOLTER, KA WUNDERLICH, B TI STRUCTURE-ANALYSIS OF THE NONCRYSTALLINE MATERIAL IN POLY(ETHYLENE-TEREPHTHALATE) FIBERS SO MACROMOLECULAR CHEMISTRY AND PHYSICS LA English DT Article ID X-RAY-DIFFRACTION; POLY(ETHYLENE-TEREPHTHALATE) FIBERS; AMORPHOUS PHASE; POLYETHYLENE; CRYSTALLINE; POLYMERS; SCATTERING; DISORDER; DRAWN; STATE AB The structures of the noncrystalline material of four poly(ethylene terephthalate) fiber samples have been studied by analyzing the X-ray scattering patterns. The noncrystalline scattering Patterns of the three semicrystalline fibers are revealed by removal of the crystalline contribution from the diffraction patterns. The crystalline phase diffraction is calculated from a structure model determined by a full-pattern X-ray fiber diffraction analysis. The noncrystalline material is further divided into an amorphous and an oriented, intermediate phase. The azimuthal scattering pattern of the former is isotropic, the latter anisotropic. The intermediate phase does not only show parallel chains along the fiber direction, but a crystal-like correlation is also possible, primarily in the material between the oriented, fibrillar crystallites. The growth of the crystalline phase in fibers is intimately coupled to this intermediate phase. Both amount and detailed structure of the intermediate phase depend on the thermal and mechanical history of the fiber. A first discussion is given of the correlation between the three phases derived by X-ray diffraction and three phases identified earlier by thermal analysis (crystalline, mobile amorphous and rigid amorphous). The mechanical properties of the fibers are seemingly more dependent on the intermediate phase than on the crystalline or amorphous phases. C1 UNIV TENNESSEE, DEPT CHEM, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV CHEM, OAK RIDGE, TN 37831 USA. OAK RIDGE NATL LAB, DIV CHEM TECHNOL, OAK RIDGE, TN 37831 USA. NR 47 TC 49 Z9 50 U1 0 U2 9 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 101161, 69451 WEINHEIM, GERMANY SN 1022-1352 EI 1521-3935 J9 MACROMOL CHEM PHYS JI Macromol. Chem. Phys. PD FEB PY 1994 VL 195 IS 2 BP 803 EP 822 DI 10.1002/macp.1994.021950236 PG 20 WC Polymer Science SC Polymer Science GA MX644 UT WOS:A1994MX64400036 ER PT J AU PAUNESKU, T GEMMELL, MA CRKVENJAKOV, R WOLOSCHAK, GE AF PAUNESKU, T GEMMELL, MA CRKVENJAKOV, R WOLOSCHAK, GE TI A PRESUMED B6 STRAIN-SPECIFIC P53 POLYMORPHISM IS CONFINED TO A B6 CELL-LINE AND IS LIKELY TO REPRESENT A FACILITATING MUTATION SO MAMMALIAN GENOME LA English DT Note ID GENE C1 ARGONNE NATL LAB,CTR MECH BIOL & BIOTECHNOL,ARGONNE,IL 60439. RI Paunesku, Tatjana/A-3488-2017; Woloschak, Gayle/A-3799-2017 OI Paunesku, Tatjana/0000-0001-8698-2938; Woloschak, Gayle/0000-0001-9209-8954 NR 5 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0938-8990 J9 MAMM GENOME JI Mamm. Genome PD FEB PY 1994 VL 5 IS 2 BP 106 EP 107 DI 10.1007/BF00292336 PG 2 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA MU085 UT WOS:A1994MU08500005 PM 8180468 ER PT J AU KATZEL, LI BUSBYWHITEHEAD, J ROGUS, EM KRAUSS, RM GOLDBERG, AP AF KATZEL, LI BUSBYWHITEHEAD, J ROGUS, EM KRAUSS, RM GOLDBERG, AP TI REDUCED ADIPOSE-TISSUE LIPOPROTEIN-LIPASE RESPONSES, POSTPRANDIAL LIPEMIA, AND LOW HIGH-DENSITY LIPOPROTEIN-2 SUBSPECIES LEVELS IN OLDER ATHLETES WITH SILENT-MYOCARDIAL-ISCHEMIA SO METABOLISM-CLINICAL AND EXPERIMENTAL LA English DT Article ID CORONARY-ARTERY DISEASE; HEPATIC LIPASE; PLASMA-LIPOPROTEIN; WEIGHT-LOSS; TRIGLYCERIDE-METABOLISM; CHOLESTEROL; OBESITY; FAT; MEN; DETERMINANTS C1 UNIV MARYLAND,SCH MED,DEPT MED,DIV GERONTOL,BALTIMORE,MD 21201. JOHNS HOPKINS UNIV,SCH MED,DIV GERONTOL & GERIATR MED,BALTIMORE,MD. FRANCIS SCOTT KEY MED CTR,BALTIMORE,MD 21224. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA. RP KATZEL, LI (reprint author), BALTIMORE VA MED CTR,GERIATR SERV 18,10 N GREENE ST,BALTIMORE,MD 21201, USA. FU NIA NIH HHS [NIA 5-KO8-AG00497, P01 AG4402-05, NIA 5-KO8-AG00383-05] NR 49 TC 21 Z9 22 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0026-0495 J9 METABOLISM JI Metab.-Clin. Exp. PD FEB PY 1994 VL 43 IS 2 BP 190 EP 198 DI 10.1016/0026-0495(94)90244-5 PG 9 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA MY293 UT WOS:A1994MY29300012 PM 8121301 ER PT J AU RAWERS, JC DOAN, RC AF RAWERS, JC DOAN, RC TI MECHANICAL PROCESSING OF IRON POWDERS IN REACTIVE AND NONREACTIVE GAS ATMOSPHERES SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID TITANIUM; NI AB Mechanical alloying, usually the blending together of elemental metal powders, has been used successfully to produce nonequilibrium microstructures. In this Bureau of Mines study, the effect of mechanical processing on powders in reactive (nitrogen) and nonreactive (argon) gas atmospheres was investigated and compared to results for similar powders that had nitrogen diffused into them. Infusion of nitrogen into powder by mechanical processing resulted in a nitrogen concentration exceeding 1 wt pct, 20 times the as-cast solubility in pure iron. Even at these high concentration levels, no nitrides formed. The nitrogen remained in solution even after consolidation by hot isostatic pressing (''hipping''). The presence of nitrogen retarded grain growth during consolidation. RP RAWERS, JC (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 21 TC 30 Z9 30 U1 2 U2 6 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD FEB PY 1994 VL 25 IS 2 BP 381 EP 388 DI 10.1007/BF02647983 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NE734 UT WOS:A1994NE73400015 ER PT J AU GITTLEMAN, CS BELL, AT RADKE, CJ AF GITTLEMAN, CS BELL, AT RADKE, CJ TI ROLE OF TETRAPROPYLAMMONIUM CATIONS IN GEL-PHASE SILICALITE SYNTHESIS SO MICROPOROUS MATERIALS LA English DT Article DE SILICALITE SYNTHESIS; TETRAPROPYLAMMONIUM; HYDROGEL SOLID TRANSFORMATION; ZEOLITE NUCLEATION; ZEOLITE CRYSTAL GROWTH ID ZSM-5 TYPE ZEOLITES; NMR-SPECTROSCOPY; MOLECULAR-SIEVE; CRYSTALLIZATION; POSITION; KINETICS; TEMPLATE AB Silicalite synthesis from tetrapropylammonium (TPA+) sodium silicate gels was studied by X-ray diffraction, elemental analysis, ion exchange, Si-29 magic angle spinning nuclear magnetic resonance spectroscopy, and scanning electron microscopy. Based on this information we confirm a hydrogel-solid transformation mechanism for silicalite crystallization. The initial synthesis gel is a highly articulated silicate network containing pockets of water with solvated Na+ and TPA+ cations. As the silica condenses and becomes more hydrophobic, water and solvated cations are expelled. The condensed silicate gel then encapsulates the hydrophobic TPA+ cations in cages resembling the channel intersections of silicalite before X-ray crystalline silicalite is observed. Crystallization occurs within the gel via rearrangement of the TPA+-occluded silicate cages by the breaking and reformation of siloxane bonds into the more stable silicalite structure. Rates of nucleation and crystallization both increase with increasing TPA+ gel content. The amount of silicalite which forms is limited by the amount of TPA+ which must be present in the ratio of one TPA+ per channel intersection. C1 LAWRENCE BERKELEY LAB, DIV CHIM, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 29 TC 12 Z9 12 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-6513 J9 MICROPOROUS MATER JI Microporous Mater. PD FEB PY 1994 VL 2 IS 2 BP 145 EP 158 DI 10.1016/0927-6513(93)E0047-K PG 14 WC Chemistry, Applied; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MX689 UT WOS:A1994MX68900007 ER PT J AU SYLVESTER, RJ BARLOW, MJ SKINNER, CJ AF SYLVESTER, RJ BARLOW, MJ SKINNER, CJ TI UIR-BAND EMISSION FROM M-SUPERGIANTS SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE MOLECULAR PROCESSES; CIRCUMSTELLAR MATTER; SUPERGIANTS; DUST, EXTINCTION; INFRARED, STARS ID INTER-STELLAR DUST; SILICATE GRAINS; COMET P/HALLEY; SUPER-GIANTS; FEATURES; SHELLS; CARBON; IDENTIFICATION; OLIVINE; STARS AB We have obtained 10-mu m spectra of 16 M supergiants, 15 of them in the h and chi Per association. Ah of the stars exhibit silicate emission features, but in addition seven of the stars show narrow UIR (unidentified infrared) band emission features, at 11.3 mu m, 8.65 mu m and other wavelengths, which are normally associated with carbon-rich media Not only are these the coolest objects to have been found to exhibit UIR-band emission, but the outflows from these classical oxygen-rich stars should form only O-rich particles according to equilibrium condensation theory. We interpret our results in terms of the non-equilibrium chemistry model by Beck et al., whereby chromospheric UV radiation can liberate some atomic carbon via the photodissociation of CO molecules, enabling the formation of carbon-rich species as well as silicates. Such a chromospheric UV radiation held could also provide the photons needed to excite the observed UIR-band emission. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP SYLVESTER, RJ (reprint author), UNIV COLL LONDON,DEPT PHYS & ASTRON,GOWER ST,LONDON WC1E 6BT,ENGLAND. RI Barlow, Michael/A-5638-2009 OI Barlow, Michael/0000-0002-3875-1171 NR 35 TC 27 Z9 27 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD FEB 1 PY 1994 VL 266 IS 3 BP 640 EP 648 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV150 UT WOS:A1994MV15000012 ER PT J AU YAMAGISHI, K AF YAMAGISHI, K TI SPONTANEOUS SYMMETRY-BREAKING AND THE FORMATION OF COLUMNAR STRUCTURES IN THE PRIMARY VISUAL-CORTEX SO NETWORK-COMPUTATION IN NEURAL SYSTEMS LA English DT Article ID BASIC NETWORK PRINCIPLES; SELECTIVE CORTICAL-CELLS; MACAQUE STRIATE CORTEX; NEURAL ARCHITECTURE; OCULAR DOMINANCE; FUNCTIONAL ARCHITECTURE; SELF-ORGANIZATION; FEATURE MAPS; EMERGENCE; ANATOMY AB We present a simple model in which the formation of ocular dominance columns in striate cortex emerges spontaneously. The model generalizes Kohonen's original self-organizing model while incorporating a continuous variable corresponding to ocularity. We demonstrate in this model that the column formation is a sort of phase transition due to (local) spontaneous-breaking of left-right ocular symmetry in the distribution of nerve cells in the cortex observed at early stage. In particular, we derive an exactly (locally) periodic columnar structure with the hyper column width given by approximately 4 square-root 3sigma where sigma is the lateral correlation length of the model. This result does not depend on the details of our generalization of Kohonen's model. Generalization to formations of another columnar structure is straightforward. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. NR 35 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-898X J9 NETWORK-COMP NEURAL JI Netw.-Comput. Neural Syst. PD FEB PY 1994 VL 5 IS 1 BP 61 EP 73 DI 10.1088/0954-898X/5/1/004 PG 13 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Neurosciences SC Computer Science; Engineering; Neurosciences & Neurology GA NA012 UT WOS:A1994NA01200004 ER PT J AU FITZNER, RE EBERHARDT, LE RICKARD, WH GRAY, RH AF FITZNER, RE EBERHARDT, LE RICKARD, WH GRAY, RH TI GREAT-BASIN CANADA GOOSE NESTING ON THE MID-COLUMBIA RIVER, WASHINGTON - AN HISTORICAL-PERSPECTIVE AND UPDATE, 1981-1990 SO NORTHWEST SCIENCE LA English DT Article AB Nesting of Great Basin Canada geese, Branta canadensis moffiti, on 20 islands in the Hanford Reach of the mid-Columbia River has been surveyed since 1953. Nest counts declined from over 300 in 1958 to a low of 108 in 1975. Since then, nest counts increased to a peak of 274 in 1989. The decline in 1960-1975 is attributed to the complete loss of Locke Island as a nesting habitat caused by persistent coyote, Canis latrans, predation. In the early years, Locke Island alone accounted for 30 to 50% of the nests in the Hanford Reach. The increase in nest counts after 1975 reflects increasing nest density on islands downriver from Locke Island. Downriver islands were historically relatively free from coyotes. In 1989 and 1990, 70% of the nests were on five downriver islands near the city of Richland. The average annual nest count for 1981-1990 was 215. Eighty percent of the nests were successfully hatched. The occurrence of unsuccessful nests was attributed to depredation 8.4%, nest abandonment 7.7%, flooding 2.6%, and 0.5% of the successful nests had infertile eggs. These observations document year-to-year changes in the island nesting population of Canada geese along the last remaining unimpounded section of the Columbia River in the United States. Population changes are related to the changing environment, including coyote predation, in eastern Washington. These studies demonstrate the value of long-term monitoring in assessing environmental change. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 3 Z9 3 U1 1 U2 3 PU WASHINGTON STATE UNIV PI PULLMAN PA PO BOX 645910, PULLMAN, WA 99164-5910 SN 0029-344X J9 NORTHWEST SCI JI Northwest Sci. PD FEB PY 1994 VL 68 IS 1 BP 37 EP 42 PG 6 WC Ecology SC Environmental Sciences & Ecology GA NC044 UT WOS:A1994NC04400006 ER PT J AU CICCARELLI, G FROST, DL AF CICCARELLI, G FROST, DL TI FRAGMENTATION MECHANISMS BASED ON SINGLE DROP STEAM EXPLOSION EXPERIMENTS USING FLASH X-RAY RADIOGRAPHY SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 5th International Topical Meeting on Nuclear Reactor Thermal Hydraulics: Toward the Next Generation of Nuclear Power Reactors CY SEP 21-24, 1992 CL SALT LAKE CITY, UT ID MODEL AB Flash X-ray and high-speed regular photography were used to investigate the fragmentation processes during the vapor explosion of single drops of molten metal immersed in water. For relatively low ambient flow velocities (< 5 m/s), a comparison of the breakup of hot and cold drops shows that whereas cold drops breakup due to the stripping of fragments by the relative flow, the fragmentation of a hot drop is dominated by the growth and collapse of a vapor bubble. X-ray radiographs show during the growth of the bubble, that fine filaments of metal protrude from the drop and the drop surface becomes highly convoluted. Using a simple model for the bubble dynamics, an estimate of the energy budget shows that the majority (about 80%) of the thermal energy transfer occurs during bubble collapse. For hot drops at higher flow velocities (> 45 m/s), vapor bubble growth is diminished and high-speed motion of vapor within the bubble leads to an enhanced fragmentation rate. C1 MCGILL UNIV,DEPT MECH ENGN,MONTREAL H3A 2K6,QUEBEC,CANADA. RP CICCARELLI, G (reprint author), BROOKHAVEN NATL LAB,DEPT ADV TECHNOL,BLDG 197D,UPTON,NY 11973, USA. NR 24 TC 28 Z9 30 U1 1 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD FEB PY 1994 VL 146 IS 1-3 BP 109 EP 132 DI 10.1016/0029-5493(94)90324-7 PG 24 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NJ170 UT WOS:A1994NJ17000011 ER PT J AU GABOR, JD PURVIANCE, RT CASSULO, JC SPENCER, BW AF GABOR, JD PURVIANCE, RT CASSULO, JC SPENCER, BW TI MOLTEN ALUMINUM-ALLOY FUEL FRAGMENTATION EXPERIMENTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 5th International Topical Meeting on Nuclear Reactor Thermal Hydraulics: Toward the Next Generation of Nuclear Power Reactors CY SEP 21-24, 1992 CL SALT LAKE CITY, UT AB Experiments were conducted in which streams of molten aluminum alloys were injected into a 1.2 m deep pool of water. The parameters varied were (i) injectant material (8001 aluminum alloy and 12.3 wt% U-87.7 wt% Al), (ii) melt superheat (0 to 50 K), (iii) water temperature (313, 343 and 373 K) and (iv) size and geometry of the pour stream (5, 10 and 20 mm diameter circular and 57 mm annular). The pour stream fragmentation was dominated by surface tension with large particles (approximately 30 mm) being formed from varicose wave breakup of the 10-mm circular pours and from the annular flow off a 57 mm diameter tube. The fragments produced by the 5 mm circular jet were smaller (approximately 10 mm), and the 20 mm jet which underwent sinuous wave breakup produced approximately 100 mm fragments. The fragments froze in 313 K water to form large solid particles with high voidage which would be readily coolable. However, in water greater-than-or-equal-to 343 K the melt fragments did not freeze during their transit through 1.2 m of water and agglomerated into a melt pool at the bottom of the vessel. RP GABOR, JD (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,9700 S CASE AVE,ARGONNE,IL 60439, USA. NR 7 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 FEB PY 1994 VL 146 IS 1-3 BP 195 EP 206 DI 10.1016/0029-5493(94)90329-8 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NJ170 UT WOS:A1994NJ17000016 ER PT J AU MCELIGOT, DM OBRIEN, JE STOOTS, CM LARSON, TK CHRISTENSON, WA MECHAM, DC LUSSIE, WG AF MCELIGOT, DM OBRIEN, JE STOOTS, CM LARSON, TK CHRISTENSON, WA MECHAM, DC LUSSIE, WG TI NATURAL-CONVECTION BETWEEN A VERTICAL CYLINDER AND A SURROUNDING ARRAY SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 5th International Topical Meeting on Nuclear Reactor Thermal Hydraulics: Toward the Next Generation of Nuclear Power Reactors CY SEP 21-24, 1992 CL SALT LAKE CITY, UT AB The generic situation considered is natural convection between a single heated, vertical cylinder and a surrounding array of cooler vertical cylinders in a triangular pattern. The ratio of the test section temperature to the cooling tube temperature was varied up to 2.6 by adjusting the electrical power. The Rayleigh number, based on test section diameter and air properties evaluated at cooling tube temperature, ranged from 2.9 X 10(4) to 4.6 X 10(5). Results indicate that the convective heat transfer data could be approximated as Nu(D)(T(ts)/T(ct))0.14 = 0.156 Ra(D)1/3 in the apparent turbulent region for Ra(L) > 1.2 X 10(11). RP MCELIGOT, DM (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 23 TC 1 Z9 1 U1 1 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 FEB PY 1994 VL 146 IS 1-3 BP 267 EP 276 DI 10.1016/0029-5493(94)90334-4 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NJ170 UT WOS:A1994NJ17000021 ER PT J AU BEELMAN, RJ FLETCHER, CD MODRO, SM AF BEELMAN, RJ FLETCHER, CD MODRO, SM TI ISSUES AFFECTING ADVANCED PASSIVE LIGHT-WATER REACTOR SAFETY ANALYSIS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 5th International Topical Meeting on Nuclear Reactor Thermal Hydraulics: Toward the Next Generation of Nuclear Power Reactors CY SEP 21-24, 1992 CL SALT LAKE CITY, UT AB Next generation commercial reactor designs emphasize enhanced safety by means of improved safety system reliability and performance. These objectives are achieved via safety system simplification and reliance on immutable natural forces for system operation. Simulating the performance of these safety systems will be central to analytical safety evaluation of advanced passive reactor designs. Yet, the characteristically small driving forces of these safety systems pose challenging computational problems to current thermal-hydraulic systems analysis codes. Additionally, the safety systems generally interact closely with one another, requiring accurate, integrated simulation of the nuclear steam supply system, engineered safeguards and containment. Furthermore, numerical safety analysis of these advanced passive reactor designs will necessitate simulation of long-duration, slowly-developing transients compared with current reactor designs. The composite effects of small computational inaccuracies on induced system interactions and perturbations over long periods may well lead to predicted results which are significantly different than would otherwise be expected or might actually occur. Comparisons between the engineered safety features of competing U.S. advanced light water reactor designs and analogous present day reactor designs arc examined relative to the adequacy of existing thermal-hydraulic safety codes in predicting the mechanisms of passive safety. Areas where existing codes may require modification, extension or assessment relative to passive safety designs are identified. Conclusions concerning the applicability of these codes to advanced passive light water reactor safety analysis are presented. RP BEELMAN, RJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 1 TC 2 Z9 4 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 FEB PY 1994 VL 146 IS 1-3 BP 289 EP 299 DI 10.1016/0029-5493(94)90336-0 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NJ170 UT WOS:A1994NJ17000023 ER PT J AU SIEFKEN, LJ OLSEN, MV AF SIEFKEN, LJ OLSEN, MV TI A MODEL FOR THE EFFECT OF INCONEL GRID SPACERS ON PROGRESSION OF DAMAGE IN-REACTOR CORE SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 5th International Topical Meeting on Nuclear Reactor Thermal Hydraulics: Toward the Next Generation of Nuclear Power Reactors CY SEP 21-24, 1992 CL SALT LAKE CITY, UT AB The chemical reaction between Inconel and Zircaloy influences the meltdown of the reactor core in the vicinity of Inconel grid spacers. A model for the influence on meltdown was developed taking into account experimental results that correlate the rate of chemical reaction between Inconel and Zircaloy with temperature and the extent of oxidation of the cladding. The model also represents the capability of grid spacers to trap slumping core material and cause a blockage of coolant flow. The calculations of the model indicate that for a typical TMLB' accident a length of cladding varying from 0.03 m to 0.06 m may be liquefied at the location of an Inconel grid spacer when the temperature at that location exceeds 1600 K. RP SIEFKEN, LJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 12 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 FEB PY 1994 VL 146 IS 1-3 BP 427 EP 437 DI 10.1016/0029-5493(94)90348-4 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NJ170 UT WOS:A1994NJ17000035 ER PT J AU WOODRUFF, SB AF WOODRUFF, SB TI SOME COMPUTATIONAL CHALLENGES OF DEVELOPING EFFICIENT PARALLEL ALGORITHMS FOR DATA-DEPENDENT COMPUTATIONS IN THERMAL-HYDRAULICS SUPERCOMPUTER APPLICATIONS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 5th International Topical Meeting on Nuclear Reactor Thermal Hydraulics: Toward the Next Generation of Nuclear Power Reactors CY SEP 21-24, 1992 CL SALT LAKE CITY, UT AB The Transient Reactor Analysis Code (TRAC), which features a two-fluid treatment of thermal-hydraulics, is designed to model transients in water reactors and related facilities. One of the major computational costs associated with TRAC and similar codes is calculating constitutive coefficients. Although the formulations for these coefficients are local, the costs are flow-regime- or data-dependent; i.e., the computations needed for a given spatial node often vary widely as a function of time. Consequently, a fixed, uniform assignment of nodes to parallel processors will result in degraded computational efficiency due to the poor load balancing. A standard method for treating data-dependent models on vector architectures has been to use gather operations (or indirect addressing) to sort the nodes into subsets that (temporarily) share a common computational model. However, this method is not effective on distributed memory data parallel architectures, where indirect addressing involves expensive communication overhead. Another serious problem with this method involves software engineering challenges in the areas of maintainability and extensibility. For example, an implementation that was hand-tuned to achieve good computational efficiency would have to be rewritten whenever the decision tree governing the sorting was modified. Using an example based on the calculation of the wall-to-liquid and wall-to-vapor heat-transfer coefficients for three nonboiling flow regimes, we describe how the use of the Fortran 90 WHERE construct and automatic inlining of functions can be used to ameliorate this problem while improving both efficiency and software engineering. Unfortunately, a general automatic solution to the load-balancing problem associated with data-dependent computations is not yet available for massively parallel architectures. We discuss why developers should either wait for such solutions or consider alternative numerical algorithms, such as a neural network representation, that do not exhibit load-balancing problems. RP WOODRUFF, SB (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 13 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 FEB PY 1994 VL 146 IS 1-3 BP 463 EP 471 DI 10.1016/0029-5493(94)90351-4 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NJ170 UT WOS:A1994NJ17000038 ER PT J AU WHITFIELD, RP AF WHITFIELD, RP TI UNITED-STATES CLEANUP PROGRAM YIELDS CONCRETE RESULTS SO NUCLEAR ENGINEERING INTERNATIONAL LA English DT Article RP WHITFIELD, RP (reprint author), US DOE,OFF ENVIRONM RESTORAT,WASHINGTON,DC 20585, 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 FEB PY 1994 VL 39 IS 475 BP 20 EP 21 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MX734 UT WOS:A1994MX73400002 ER PT J AU CESARIO, R HERMANN, H ONO, M PAOLETTI, F SCHMITZ, L AF CESARIO, R HERMANN, H ONO, M PAOLETTI, F SCHMITZ, L TI STUDY OF PARAMETRIC-INSTABILITIES DURING THE ION BERNSTEIN WAVE HEATING EXPERIMENT ON PBX-M SO NUCLEAR FUSION LA English DT Article ID FREQUENCY-RANGE; TOKAMAK; SOUND AB Parametric instabilities during the ion Bernstein wave (IBW) plasma heating experiment on PBX-M are investigated both theoretically and experimentally. The theoretical work shows that the RF power threshold of the instabilities is very low when the plasma density near the antenna satisfies the condition 2omega(pi) < omega0 << omega(pe). The threshold becomes very high, >> 1 MW, and is determined by convective losses due to plasma inhomogeneity when the plasma density near the antenna is sufficiently high that 0.5 < omega(pi)/omega0 < 1. According to the theory, the parametric instability activity should increase as the plasma is moved away from the antenna, creating a low density electron plasma wave 'gap' region. To test this hypothesis on PBX-M, the plasma position was deliberately varied while monitoring this activity. Under normal IBW operating conditions, very little parametric instability activity was observed less-than-or-equal-to 50 dB below the pump wave (omega = omega(RF)). However, when the plasma edge was moved away from the antenna by about 2 cm, the parametric instability activity increased greatly, exceeding 20 dB of the pump wave. This result shows that the observed parametric instability activity can be explained in terms of the plasma inhomogeneity convective model. It was also demonstrated that, by controlling the plasma position with respect to the antenna, parametric instability activity can be controlled at a low level. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. MIT,CAMBRIDGE,MA 02139. UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024. EURATOM ENEA FUSIONE,CRE,ROME,ITALY. RP CESARIO, R (reprint author), EURATOM ENEA FUSIONE,CRE,FRASCATI,ITALY. NR 20 TC 11 Z9 11 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 FEB PY 1994 VL 34 IS 2 BP 261 EP 269 DI 10.1088/0029-5515/34/2/I08 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NN903 UT WOS:A1994NN90300008 ER PT J AU BELL, RE BERNABEI, S GREENOUGH, N LAGIN, L LEBLANC, B OKABAYASHI, M TAKAHASHI, H SCHMITZ, L BLUSH, L DOERNER, RP TYNAN, GR CONN, RW LUCKHARDT, SC AF BELL, RE BERNABEI, S GREENOUGH, N LAGIN, L LEBLANC, B OKABAYASHI, M TAKAHASHI, H SCHMITZ, L BLUSH, L DOERNER, RP TYNAN, GR CONN, RW LUCKHARDT, SC TI LOWER-HYBRID WAVE COUPLING IN PBX-M SO NUCLEAR FUSION LA English DT Letter ID CURRENT DRIVE; TOKAMAK; ASDEX AB The coupling of the waves launched from a 4.6 GHz lower hybrid (LH) system into PBX-M plasmas has been studied for both L mode and H mode plasmas. The characteristics of the plasma in front of the LH coupler have been measured with a fast Langmuir probe. The reflected power of the coupler has been measured across the transition to the H mode as a function of phase and the distance between the coupler and the separatrix. A transient rise in the LH reflection coefficient was observed near the L-H transition under some conditions. Coupling depends primarily on the electron density in the vicinity of the coupler, and proper positioning of the coupler can compensate for changes in the plasma edge due to H mode transitions. Good coupling can be maintained throughout the H mode. C1 UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024. MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP BELL, RE (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 8 TC 7 Z9 7 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD FEB PY 1994 VL 34 IS 2 BP 271 EP 275 DI 10.1088/0029-5515/34/2/I09 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NN903 UT WOS:A1994NN90300009 ER PT J AU MAINGI, R HOGAN, JT OWEN, LW MIODUSZEWSKI, PK RENSINK, ME GILLIGAN, JG HANKINS, OE WERLEY, KA AF MAINGI, R HOGAN, JT OWEN, LW MIODUSZEWSKI, PK RENSINK, ME GILLIGAN, JG HANKINS, OE WERLEY, KA TI COMPARISON OF A SIMPLE RECYCLING MODEL AND A COMPLEX RECYCLING MODEL IN EDGE PLASMA TRANSPORT CALCULATIONS SO NUCLEAR FUSION LA English DT Letter ID DIVERTOR AB The results of a significantly more efficient model (molecular model) for computing particle and energy sources from recycling in edge plasma transport codes, such as b2, are compared with results from more detailed calculations using the b2 code coupled with the neutral transport code, DEGAS. The molecular model considers the reflux both of cold molecules and of energetic backscattered atomic neutrals from the divertor target plates and has been implemented to function internally within the b2 code. The molecular model calculations are shown to be in reasonable agreement with more detailed calculations done with the coupled b2/DEGAS codes for seven cases typical of conditions in the scrape-off layer of the Doublet III (DIII-D) tokamak. Because the molecular model is a far less expensive computational tool, it represents a significant improvement over the existing (coupled) edge transport recycling model. Thus, it may find wider application in design studies for future devices, such as the International Thermonuclear Experimental Reactor (ITER). C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. N CAROLINA STATE UNIV,RALEIGH,NC 27695. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP MAINGI, R (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 21 TC 15 Z9 15 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 FEB PY 1994 VL 34 IS 2 BP 283 EP 287 DI 10.1088/0029-5515/34/2/I11 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NN903 UT WOS:A1994NN90300011 ER PT J AU UCKAN, T ISLER, RC JERNIGAN, TC LYON, JF MIODUSZEWSKI, PK MURAKAMI, M RASMUSSEN, DA WILGEN, JB ACETO, SC ZIELINSKI, JJ AF UCKAN, T ISLER, RC JERNIGAN, TC LYON, JF MIODUSZEWSKI, PK MURAKAMI, M RASMUSSEN, DA WILGEN, JB ACETO, SC ZIELINSKI, JJ TI BIASED LIMITER EXPERIMENTS ON THE ADVANCED TOROIDAL FACILITY (ATF) TORSATRON SO NUCLEAR FUSION LA English DT Letter ID EDGE TURBULENCE AB The Advanced Toroidal Facility (ATF) torsatron incorporates two rail limiters that can be positioned by external controls. The influence on the plasma parameters of biasing these limiters both positively and negatively with respect to the walls has been investigated. Experiments have been carried out in the electron cyclotron heated plasmas at 200 kW with a typical density of 5 X 10(12) cm-3 and a central electron temperature of approximately 900 eV. Negative biasing produces only small changes in the plasma parameters, but positive biasing increases the particle confinement by about a factor of 5, although the plasma stored energy does fall at the higher voltages. In addition, positive biasing produces the following effects compared with floating limiter discharges: the core density profiles become peaked rather than hollow, the electric field at the edge becomes more negative (pointing radially inward), the magnitudes of the edge fluctuations and the fluctuation induced transport are reduced, the fluctuation wavelengths become longer and their propagation direction reverses from the electron to the ion diamagnetic direction. Neither polarity of biasing appears to affect the impurity content or transport. C1 RENSSELAER POLYTECH INST,TROY,NY 12181. RP UCKAN, T (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830, USA. OI Isler, Ralph/0000-0002-5368-7200 NR 11 TC 4 Z9 4 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD FEB PY 1994 VL 34 IS 2 BP 295 EP 299 DI 10.1088/0029-5515/34/2/I13 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NN903 UT WOS:A1994NN90300013 ER PT J AU ABBOTT, B HOWELL, BL KOLTICK, D MCILWAIN, RL SCHMITZ, CJ SHIBATA, EI ZHOU, Z BAUMBAUGH, B IVANCIC, M JAQUES, J KEHOE, R KELLEY, M MAHONEY, M MARCHANT, J RUCHTI, R WAYNE, M ATAC, M BAUMBAUGH, A ELIAS, JE ROMERO, A CHRISMAN, D PARK, J ADAMS, MR CHUNG, M GOLDBERG, H MARGULIES, S SOLOMON, J CHANEY, R ORGERON, J ARMSTRONG, T LEWIS, RA MITCHELL, GS MOORE, RS PASSANEAU, J SMITH, GA CORCORAN, M ADAMS, D BIRD, F FENKER, H REGAN, T THOMAS, J AF ABBOTT, B HOWELL, BL KOLTICK, D MCILWAIN, RL SCHMITZ, CJ SHIBATA, EI ZHOU, Z BAUMBAUGH, B IVANCIC, M JAQUES, J KEHOE, R KELLEY, M MAHONEY, M MARCHANT, J RUCHTI, R WAYNE, M ATAC, M BAUMBAUGH, A ELIAS, JE ROMERO, A CHRISMAN, D PARK, J ADAMS, MR CHUNG, M GOLDBERG, H MARGULIES, S SOLOMON, J CHANEY, R ORGERON, J ARMSTRONG, T LEWIS, RA MITCHELL, GS MOORE, RS PASSANEAU, J SMITH, GA CORCORAN, M ADAMS, D BIRD, F FENKER, H REGAN, T THOMAS, J TI BEAM TEST OF A 12-LAYER SCINTILLATING-FIBER CHARGED-PARTICLE TRACKING SYSTEM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A 96-channel, 3-superlayer, scintillating-fiber tracking system has been tested in a 5 GeV/c pi(-) beam. The scintillating fibers were 830 mu m in diameter, spaced 850 mu m apart, and 4.3 m in length. They were coupled to 6 m long, clear fiber waveguides and finally to visible light photon counters. A spatial resolution of similar to 150 mu m for a double-layered ribbon was achieved with this tracking system. This first prototype of a charged-particle tracking system configured for the Solenoidal Detector Collaboration at the Superconducting Super Collider is a benchmark in verifying the expected number of photoelectrons from the fibers. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. UNIV TEXAS,DEPT PHYS,RICHARDSON,TX 75083. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. NR 5 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 1 PY 1994 VL 339 IS 3 BP 439 EP 448 DI 10.1016/0168-9002(94)90180-5 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW200 UT WOS:A1994MW20000005 ER PT J AU SMITH, DL AF SMITH, DL TI CONCEPT AND SIGNIFICANCE OF A DIMENSIONLESS SENSITIVITY MATRIX IN APPLICATIONS OF GENERALIZED LEAST-SQUARES ANALYSIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter AB The concept of a dimensionless sensitivity matrix is introduced. It is shown how this matrix can be used effectively to select specific measurements which will impact most significantly on the refinement, by generalized least-squares analysis, of prior knowledge of physical parameters employed in representing measurable quantities. Examples are presented to illustrate this approach. RP SMITH, DL (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 1 PY 1994 VL 339 IS 3 BP 626 EP 629 DI 10.1016/0168-9002(94)90203-8 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MW200 UT WOS:A1994MW20000028 ER PT J AU DEVINE, RAB WARREN, WL SHANEYFELT, MR FLEETWOOD, DM ASPER, B AF DEVINE, RAB WARREN, WL SHANEYFELT, MR FLEETWOOD, DM ASPER, B TI OXIDE MODIFICATION DUE TO HIGH-TEMPERATURE PROCESSING OF SI/SIO2/SI STRUCTURES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT Symposium on Materials Aspects of Ion Beam Synthesis: Phase Formation and Modification, at the Spring Meeting of the European-Materials-Society CY MAY 04-07, 1993 CL STRASBOURG, FRANCE SP EUROPEAN MAT SOC ID ACTIVE DEFECTS; SIMOX AB Si/SiO2/Si structures have been subjected to 6 h anneals at 1320 degrees C and defects generated by the annealing process revealed by ultra-violet and X ray irradiation and by hole injection. Two types of oxygen-vacancy related defects have been detected in the oxide by electron spin resonance, one involving Si interstitials. They are both observed to be located within 100 nm of each of the Si/SiO2 interfaces. It is reasoned that the high temperature annealing process getters oxygen from the oxide into the over and underlying Si. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. CEN G,DMEL,CEA TECHNOL AVANCEE,F-38041 GRENOBLE,FRANCE. RP DEVINE, RAB (reprint author), FRANCE TELECOM,CNET,BP 98,F-38243 MEYLAN,FRANCE. NR 11 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD FEB PY 1994 VL 84 IS 2 BP 254 EP 257 DI 10.1016/0168-583X(94)95765-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MX515 UT WOS:A1994MX51500027 ER PT J AU SPECHT, ED WALKO, DA ZINKLE, SJ AF SPECHT, ED WALKO, DA ZINKLE, SJ TI AMORPHIZATION OF AL2O3 BY ION-INDUCED DENSITY REDUCTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID RADIATION-DAMAGE; RESIDUAL-STRESS; IMPLANTATION; SILICON; SAPPHIRE; CERAMICS; TEMPERATURE; DEPENDENCE; SURFACES; OXIDES AB Al2O3 at room temperature amorphizes at an anomalously high ion implantation dose, corresponding to hundreds of displacements per atom (dpa). We have performed X-ray reflectometry and Monte Carlo simulations, which show that amorphization near the. surface is preceded by a progressive reduction in density caused by high-energy-transfer elastic collisions which knock Al and O atoms deeper into the crystal. Electron microscopy shows that the reduction in density is at least partially accommodated by void formation. We propose that the accumulation of these and other low-density defects such as vacancy clusters and nuclei of amorphous and lower-density crystalline phases of Al2O3 may serve as a mechanism for high-dose amorphization. RP SPECHT, ED (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009; OI Specht, Eliot/0000-0002-3191-2163; Zinkle, Steven/0000-0003-2890-6915 NR 29 TC 10 Z9 10 U1 0 U2 7 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 FEB PY 1994 VL 84 IS 3 BP 323 EP 330 DI 10.1016/0168-583X(94)95724-X PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MZ153 UT WOS:A1994MZ15300007 ER PT J AU DRAKE, DM DROSG, M BYRD, RC REEDY, RC CLARK, DA ENGLERT, PAJ DEMPSEY, JF BOBIAS, SG HARRIS, L AF DRAKE, DM DROSG, M BYRD, RC REEDY, RC CLARK, DA ENGLERT, PAJ DEMPSEY, JF BOBIAS, SG HARRIS, L TI EXPERIMENTAL AND NUMERICAL-SIMULATION OF MARTIAN NEUTRON DISTRIBUTIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID GAMMA-RAY SPECTROSCOPY; SOLAR-SYSTEM MATTER; COSMOGENIC NUCLIDES; HYDROGEN CONTENT; LEAKAGE SPECTRA; PROTONS; TARGET; METEORITES; RECORD AB Measurements of the gamma-ray and neutron distributions produced by cosmic-ray bombardment of planetary surfaces can provide important information about water content and near-surface elemental compositions. Accurate interpretation of such measurements depends heavily on comparisons with radiation-transport calculations, which involve not only the soil composition but also assumptions about (1) particle types and energy distributions of cosmic rays, (2) interaction mechanisms for high-energy protons and neutrons, (3) neutron transport at low energies, and (4) production of prompt gamma rays and radionuclides in proton- and neutron-induced reactions. The present experiment simulates the planetary situation by directing a beam of 800 MeV protons onto a large container of Martian-like sand. Measurements were made of (1) the spatial distributions for protons and neutrons inside the container via activation foils and (2) the energy spectrum for neutron leakage out of the container via time of flight. Several configurations of the target were used to represent different Martian surfaces. The measured neutron-energy spectra are in good agreement with calculations made using a computer code that couples medium-energy neutron production to low-energy neutron transport, and the measured spatial distributions match those predicted using calculated fluxes and known cross sections for radionuclide production. The analyses include discussions of soil water content, finite-size effects, and the implications for data from possible planetary missions. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SAN JOSE STATE UNIV,SAN JOSE,CA 95192. OI Reedy, Robert/0000-0002-2189-1303 NR 46 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD FEB PY 1994 VL 84 IS 3 BP 337 EP 356 DI 10.1016/0168-583X(94)95726-6 PG 20 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MZ153 UT WOS:A1994MZ15300009 ER PT J AU WANG, GJ SOM, P OSTER, ZH VOLKOW, ND KNAPP, FF SACKER, DF AF WANG, GJ SOM, P OSTER, ZH VOLKOW, ND KNAPP, FF SACKER, DF TI QUANTITATIVE AUTORADIOGRAPHIC MEASUREMENT OF COCAINE-INDUCED REGIONAL MYOCARDIAL METABOLIC CHANGES IN HYPERTENSIVE RATS SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article ID INFARCTION; ABUSE; ISCHEMIA; ACID AB A rat model of hypertensive cardiomyopathy was studied to evaluate the acute effects of cocaine on the myocardium. Using autoradiographic microimaging techniques, myocardial perfusion (Tl-201) and energy substrate utilization (glucose: [C-14]2-fluoro-2-deoxy-D-glucose-[C-14]2DG and fatty acid (15-[p-iodophenyl])-3-R,S-methyl pentadecanoic acid-[I-131]BMIPP) were studied in Dahl strain salt-sensitive normotensive and hypertensive rats with and without intravenous cocaine. The right ventricle, septum, endocardium and epicardium of the left ventricle were analyzed. Increased perfusion (18%) was seen in the myocardium of the hypertensive rats as compared to the normotensive rats. There was higher [C-14]2DG (254%) and lower fatty acid (13.2%) uptake in the hypertensive rats, indicative of a shift from aerobic to anaerobic substrate utilization. In cocaine-treated normotensive rats, a generalized decrease in myocardial perfusion (30%) and increased glucose metabolism (89%) was seen. In cocaine-treated hypertensive rats, the increased myocardial perfusion (16%) was heterogeneous and was more pronounced in septum and epicardium. The endocardium and epicardium in the hypertensive rats showed an overall increase (23%) in glucose utilization after cocaine which was not as dramatic as was seen in the normotensive heart and a slight increase in fatty acid utilization. These results are consistent with prior observations that under pressure overload the myocardium responds non-uniformly. It may well be that the hypertensive cardiomyopathic heart is unable to respond to the challenge of cocaine by further increasing glucose utilization. These data obtained in an animal model of hypertension seem to indicate that hypertension may increase the risk of cardiac complications related to cocaine. C1 SUNY STONY BROOK,DEPT RADIOL,STONY BROOK,NY 11794. OAK RIDGE NATL LAB,NUCL MED GRP,OAK RIDGE,TN 37831. RP WANG, GJ (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 34 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2897 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD FEB PY 1994 VL 21 IS 2 BP 245 EP 250 DI 10.1016/0969-8051(94)90015-9 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MY366 UT WOS:A1994MY36600015 PM 9234289 ER PT J AU MOREL, JE MCGHEE, JM AF MOREL, JE MCGHEE, JM TI A FISSION-SOURCE ACCELERATION TECHNIQUE FOR TIME-DEPENDENT EVEN-PARITY SN CALCULATIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID SYNTHETIC ACCELERATION; EQUATIONS; SCHEME AB A synthetic scheme for accelerating the convergence of the fission source in time-dependent multigroup even-parity S(n) calculations with downscatter is described. The low-order operator associated with this scheme is a one-group diffusion operator. Thus, this scheme can be thought of as a variant of diffusion synthetic acceleration. A Fourier analysis of this scheme is performed, which indicates that it is unconditionally effective for a spatially infinite model problem. Computational results are presented that show excellent performance of the method in three-dimensional calculations. Although this method is derived for the even-parity S(n) equations, it can easily be generalized for application to the standard first-order S(n) equations. The accelerated iteration equations for both the even-parity and first-order S(n) equations are given, but only the even-parity algorithm is computationally tested. RP MOREL, JE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 10 Z9 10 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD FEB PY 1994 VL 116 IS 2 BP 73 EP 85 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MZ564 UT WOS:A1994MZ56400001 ER PT J AU BOOTH, TE AF BOOTH, TE TI A MONTE-CARLO VARIANCE REDUCTION APPROACH FOR NON-BOLTZMANN TALLIES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Quantities that depend on the collective effects of groups of particles cannot be obtained from the standard Boltzmann transport equation. Monte Carlo estimates of these quantities are called non-Boltzmann tallies and have become increasingly important recently. Standard Monte Carlo variance reduction techniques were designed for tallies based on individual particles rather than groups of particles. Experience with non-Boltzmann tallies and analog Monte Carlo has demonstrated the severe limitations of analog Monte Carlo for many non-Boltzmann tallies. In fact, many calculations absolutely require variance reduction methods to achieve practical computation times. A description is given of how variance reduction techniques can be applied when non-Boltzmann estimates are desired. RP BOOTH, TE (reprint author), LOS ALAMOS NATL LAB,POB 1663,X-6 MS B226,LOS ALAMOS,NM 87545, USA. NR 5 TC 9 Z9 9 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD FEB PY 1994 VL 116 IS 2 BP 113 EP 124 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MZ564 UT WOS:A1994MZ56400004 ER PT J AU ABREFAH, J DEABREU, HFG TEHRANIAN, F KIM, YS OLANDER, DR AF ABREFAH, J DEABREU, HFG TEHRANIAN, F KIM, YS OLANDER, DR TI INTERACTION OF IODINE WITH PREOXIDIZED STAINLESS-STEEL SO NUCLEAR TECHNOLOGY LA English DT Article DE PREFILMED STEEL; INTERACTIONS; SATURATION AB The kinetics of the reaction of molecular iodine with preoxidized Type 304 stainless steel was studied by mass spectrometric and gravimetric techniques. The temperature range was 438 to 803 K, and the iodine partial pressures in the 1-atm total pressure water vapor-hydrogen gas ranged from 1.33 to 133 Pa. Examination of the reacted surface by electronic spectroscopies showed localized attack in the form of highly fractured crystalline deposits that contained significant iodine concentrations. The mass spectrometric results revealed no HI in the gas despite favorable thermodynamics for formation of this species. The gravimetric results showed an initial rapid increase in weight followed by a slow, long-term weight change that did not appear to approach saturation. The saturation iodine concentration on the surface due to the initial deposition process was greatest at 573 K. The kinetics of the initial uptake was analyzed by a first-order kinetics model. The characteristic times of attainment of saturation were on the order of 1 h and showed a very small activation energy. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP ABREFAH, J (reprint author), UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720, USA. NR 17 TC 1 Z9 1 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD FEB PY 1994 VL 105 IS 2 BP 137 EP 144 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MT965 UT WOS:A1994MT96500001 ER PT J AU JAHSHAN, S ANGHAIE, S AF JAHSHAN, S ANGHAIE, S TI EVALUATION OF THE REACTIVITY EXPANSION DEFECT FOR SMALL SOLID-CORE REACTORS AND COMPONENTS SO NUCLEAR TECHNOLOGY LA English DT Note DE REACTIVITY DEFECT; EXPANSION; NONADDITIVE C1 UNIV FLORIDA,DEPT NUCL ENGN SCI,GAINESVILLE,FL 32611. RP JAHSHAN, S (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD FEB PY 1994 VL 105 IS 2 BP 291 EP 292 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MT965 UT WOS:A1994MT96500012 ER PT J AU GOLLEY, FB PINDER, JE SMALLIDGE, PJ LAMBERT, NJ AF GOLLEY, FB PINDER, JE SMALLIDGE, PJ LAMBERT, NJ TI LIMITED INVASION AND REPRODUCTION OF LOBLOLLY PINES IN A LARGE SOUTH-CAROLINA OLD FIELD SO OIKOS LA English DT Review ID TREE ESTABLISHMENT; SUCCESSION; GROWTH; SURVIVAL; COLONIZATION; COMPETITION; MECHANISMS; SOILS AB The invasion and subsequent reproduction of loblolly pines (Pious taeda) in a large (142 ha) old field in Aiken County, South Carolina, USA has occurred more slowly than expected based on successional studies performed in the 1930s and 1940s. Although the field was abandoned in 1951, only 57 pines invaded a centrally-located 26.7-ha study plot. Pines are normally expected to completely occupy an abandoned field within 25 years. Most of the trees in the center of the field were established between 1955 and 1965 and have shown limited reproduction and dispersal of offspring. The median number of offspring per parent tree is 13, and 90% of the offspring are located within 20 m of the parent. The limited pine invasion map be due to the large size of the abandoned field. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP GOLLEY, FB (reprint author), UNIV GEORGIA,INST ECOL,ATHENS,GA 30602, USA. NR 46 TC 10 Z9 11 U1 0 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0030-1299 J9 OIKOS JI Oikos PD FEB PY 1994 VL 69 IS 1 BP 21 EP 27 DI 10.2307/3545279 PG 7 WC Ecology SC Environmental Sciences & Ecology GA MR887 UT WOS:A1994MR88700002 ER PT J AU MCCOMAS, DJ FUNSTEN, HO GOSLING, JT MOORE, KR SCIME, EE THOMSEN, MF AF MCCOMAS, DJ FUNSTEN, HO GOSLING, JT MOORE, KR SCIME, EE THOMSEN, MF TI FUNDAMENTALS OF LOW-ENERGY NEUTRAL ATOM IMAGING SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT SPIE Conference on Instrumentation for Magnetospheric Imagery CY JUL 21-22, 1992 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; SPACE PHYSICS; SPACE PLASMA; NEUTRAL IMAGING; ENERGETIC NEUTRAL ATOMS; LOW-ENERGY NEUTRAL ATOMS AB Imaging of the space plasma environment via low-energy neutral atoms (LENAs) promises to revolutionize the way in which large-scale space plasma phenomena are viewed and understood. LENAs are produced by charge exchange between plasma ions (less than tens of kilo-electron-volts) and cold geocoronal neutrals; these LENAs radiate outward in all directions from their points of origin. Previously developed methods for imaging higher energy neutrals are not suitable for observing the majority of the terrestrial magnetosphere, which is comprised primarily of lower energy plasma populations. This paper briefly describes both the direct and indirect techniques that have been suggested for imaging LENAs to date. We then examine in more detail the most advanced of these techniques appropriate for magnetospheric imaging, indirect detection based on ionization of LENAs as they transit ultrathin foils. Such a LENA imager consists of four basic components: (1) a biased collimator to remove the ambient charged particles and set the azimuthal field of view; (2) an ultrathin foil, which ionizes a portion of the incident LENAs; (3) an electrostatic analyzer to reject UV light and set the energy passband; and (4) a coincidence position detector to measure converted LENAs while rejecting noise and penetrating radiation. RP MCCOMAS, DJ (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MAIL STOP D466,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 18 TC 12 Z9 12 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 335 EP 341 DI 10.1117/12.155921 PG 7 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200003 ER PT J AU MOORE, KR SCIME, EE FUNSTEN, HO MCCOMAS, DJ THOMSEN, MF AF MOORE, KR SCIME, EE FUNSTEN, HO MCCOMAS, DJ THOMSEN, MF TI LOW-ENERGY NEUTRAL ATOM EMISSION FROM THE EARTHS MAGNETOSPHERE SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT SPIE Conference on Instrumentation for Magnetospheric Imagery CY JUL 21-22, 1992 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; NEUTRAL ATOM DETECTION; MASSIVELY PARALLEL COMPUTING ID RING CURRENT AB Imaging of the terrestrial magnetosphere is possible through the detection of low-energy neutral atoms (LENAs) produced by charge exchange between magnetospheric plasma ions and neutral atoms of the Earth's geocorona. We present calculations of both hydrogen and oxygen line-of-sight LENA fluxes expected on orbit for various plasma regimes as predicted by the Rice University Magnetospheric Specification Model. To decrease the required computation time, we are in the process of adapting our code for massively parallel computers. The speed gains achieved from parallel algorithms are substantial, and we present results from computational runs on the Connection Machine CM-2 data parallel supercomputer. We also estimate expected image count rates and image quality based on realistic instrument geometric factors, energy passbands, neutral atom scattering in the instrument, and image accumulation intervals. The results indicate that LENA imaging instruments will need a geometric factor (G) on the order of 0.1 cm(2) sr eV/eV to be capable of imaging storm time ring currents, and a G of 1.0 cm(2) sr eV/eV in order to image the quiet time ring current fluxes, ion injections from the tail, and subsequent ion drifts toward the dayside magnetopause. RP MOORE, KR (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,SST-7,MS D466,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 18 TC 11 Z9 11 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 342 EP 348 DI 10.1117/12.155924 PG 7 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200004 ER PT J AU FUNSTEN, HO MCCOMAS, DJ SCIME, EE AF FUNSTEN, HO MCCOMAS, DJ SCIME, EE TI COMPARATIVE-STUDY OF LOW-ENERGY NEUTRAL ATOM IMAGING TECHNIQUES SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; SPACE PHYSICS; NEUTRAL ATOM DETECTION ID CESIATED TUNGSTEN SURFACES; INDUCED ELECTRON-EMISSION; HYDROGEN-ION-BEAM; THIN CARBON FOILS; CHARGE FRACTIONS; CLEAN METALS; SCATTERING; PARTICLES; SOLIDS; DEPENDENCE AB Low-energy neutral atom (LENA) imaging promises to be a revolutionary tool for global imaging of space plasmas. The technical challenges of LENA detection include separating them from the intense ambient UV without losing information about their incident trajectories, quantifying their trajectories, and obtaining high-sensitivity measurements. Two techniques that have been proposed for this purpose are based on fundamentally different atomic interaction mechanisms between LENAs and a solid: LENA transmission through an ultrathin foil and LENA reflection from a solid surface. Both of these methods provide LENA ionization (for subsequent removal from the UV by electrostatic deflection) and secondary electron emission (for time-of-flight start pulse generation and/or coincidence). We present a comparative study of the transmission and reflection techniques based on differences in atomic interactions with solids and surfaces. Transmission methods are shown to be superior for secondary electron emission rather than reflection methods. Furthermore, transmission methods are shown to be sufficient for LENA imaging at LENA energies of approximately 1 keV to greater than 30 keV. A hybrid instrument using reflection from a tow work function surface for LENA ionization and transmission for secondary electron emission is optimal for imaging of LENAs with energies less than approximately 1 keV. RP FUNSTEN, HO (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MS D466,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 72 TC 6 Z9 6 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 349 EP 356 DI 10.1117/12.155918 PG 8 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200005 ER PT J AU SCIME, EE FUNSTEN, HO MCCOMAS, DJ MOORE, KR GRUNTMAN, MA AF SCIME, EE FUNSTEN, HO MCCOMAS, DJ MOORE, KR GRUNTMAN, MA TI NOVEL LOW-ENERGY NEUTRAL ATOM IMAGING TECHNIQUE SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; TRANSMISSION GRATINGS; NEUTRAL ATOM DETECTION; ULTRAVIOLET POLARIZERS AB Recently proposed low-energy neutral atom (LENA) imaging techniques rely on collisional processes to convert LENAs into ions to separate the neutrals from the intense UV radiation background. At low energies, these collisional processes have poor conversion efficiencies and limit the angular resolution of these devices. However, if the intense UV light background can be suppressed, direct LENA detection is possible. We present results from a series of experiments designed to develop a novel filtering structure based on free-standing gold transmission gratings. If the grating period is sufficiently small, the gratings can substantially polarize UV light in the wavelength range 300 to 1500 Angstrom. If a second grating is placed behind the first grating with its axis of polarization oriented perpendicular to that of the first, considerable attenuation of the UV radiation is achievable. The neutrals pass through the remaining open area of two gratings and are directly detected. We have obtained nominal 2000-Angstrom-period (1000-Angstrom bars with 1000-Angstrom, slits) gratings and measured their UV and atomic transmission characteristics. The geometric factor of a LENA imager based on this technology is comparable to that of other proposed LENA imagers, with a significantly better angular resolution. C1 UNIV SO CALIF,CTR SPACE SCI,LOS ANGELES,CA 90089. RP SCIME, EE (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,SST-7,MS D466,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 18 TC 13 Z9 13 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 357 EP 361 DI 10.1117/12.155919 PG 5 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200006 ER PT J AU FRANK, LA SIGWARTH, JB WILLIAMS, DJ ROELOF, EC MITCHELL, DG GOLD, RE KEATH, EP MAUK, BH MENG, CI CARPENTER, DL HULTQVIST, BK LUNDIN, RN SISCOE, GL WOLF, RA GORNEY, DJ SCHULZ, M MCCOMAS, DJ FUNSTEN, HO MOORE, KR SMITH, BW CRAVEN, JD CHIU, YT MEIER, RR SEELY, JF AF FRANK, LA SIGWARTH, JB WILLIAMS, DJ ROELOF, EC MITCHELL, DG GOLD, RE KEATH, EP MAUK, BH MENG, CI CARPENTER, DL HULTQVIST, BK LUNDIN, RN SISCOE, GL WOLF, RA GORNEY, DJ SCHULZ, M MCCOMAS, DJ FUNSTEN, HO MOORE, KR SMITH, BW CRAVEN, JD CHIU, YT MEIER, RR SEELY, JF TI IMAGERS FOR THE MAGNETOSPHERE, AURORA, AND PLASMASPHERE SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING ID ENERGETIC NEUTRAL ATOMS; RING CURRENT; ATMOSPHERE; RADIATION; DENSITY; ION AB We present a small Explorer mission, Imagers for the Magnetosphere, Aurora, and Plasmasphere (IMAP), to provide the first global magnetospheric images that will allow a systematic study of major regions of the magnetosphere, their dynamics, and their interactions. The mission objective is to obtain simultaneous images of the inner magnetosphere (ring current and trapped particles), the plasmasphere, the aurora, and auroral upflowing ions. The instruments are (1) a Low Energy Neutral Particle Imager for imaging H and O atoms, separately, in the energy range of similar to 1 to 30 keV, in several energy passbands; (2) an Energetic Neutral Particle Imager for imaging H atoms in the energy range similar to 15 to 200 keV and, separately, O atoms in the energy range similar to 60 to 200 keV, each in several energy passbands; (3) an Extreme-Ultraviolet Imager to obtain images of the plasmasphere (the distribution of cold He+) by means of He+ (30.4 nm) emissions; and (4) a Far-Ultraviolet Imaging Monochromator to provide images of the aurora and the geocorona. All images will be obtained with time and spatial resolutions appropriate to the global and macroscale structures to be observed. IMAP promises new quantitative analyses that will provide great advances in insight and knowledge of global and macroscale magnetospheric parameters. The results expected from IMAP will provide the first large-scale visualization of the ring current, the trapped ion populations, the plasmasphere, and the upflowing auroral ion population. Such images, coupled with simultaneously obtained auroral images, will also provide the initial opportunity to globally interconnect these major magnetospheric regions. The time sequencing of IMAP images will also provide the initial large-scale visualization of magnetospheric dynamics, both in space and time. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. STANFORD UNIV,DEPT STARLAB ELECT ENGN,STANFORD,CA 94305. SWEDISH INST SPACE PHYS,S-98128 KIRUNA,SWEDEN. BOSTON UNIV,CTR SPACE PHYS,BOSTON,MA 02215. RICE UNIV,DEPT SPACE PHYS & ASTRON,HOUSTON,TX 77251. AEROSP CORP,CTR SPACE & ENVIRONM TECHNOL,LOS ANGELES,CA 90009. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV ALASKA,INST GEOPHYS,FAIRBANKS,AK 99775. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP FRANK, LA (reprint author), UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242, USA. RI Meier, Robert/G-4749-2014; Funsten, Herbert/A-5702-2015; Mauk, Barry/E-8420-2017 OI Meier, Robert/0000-0001-8497-7115; Funsten, Herbert/0000-0002-6817-1039; Mauk, Barry/0000-0001-9789-3797 NR 55 TC 7 Z9 7 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 391 EP 408 DI 10.1117/12.155986 PG 18 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200010 ER PT J AU ANDERSON, KB AF ANDERSON, KB TI THE NATURE AND FATE OF NATURAL RESINS IN THE GEOSPHERE .4. MIDDLE AND UPPER CRETACEOUS AMBER FROM THE TAIMYR PENINSULA, SIBERIA - EVIDENCE FOR A NEW FORM OF POLYLABDANOID OF RESINITE AND REVISION OF THE CLASSIFICATION OF CLASS-I RESINITES SO ORGANIC GEOCHEMISTRY LA English DT Note DE RESINITE; AMBER; CLASSIFICATION; BIFORMENE; COMMUNAL; POLYLABDANOID; PY-GC-MS AB Analysis of three amber (resinite) samples collected from Middle and Upper Cretaceous sediments in the Taimyr Peninsula, Siberia, indicates that these materials are based on copolymers of biformene (1) and communol (11). These resinites represent a previously undescribed form of Class I (polylabdanoid) resinite. Definitions of the sub-classes of Class I resinites have been revised (generalized) to recognize the general relation between these samples and other Class lb resinites, and to facilitate classification of polylabdanoid resinites which do not necessarily incorporate communic (or ozic) acids. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 9 TC 45 Z9 46 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6380 J9 ORG GEOCHEM JI Org. Geochem. PD FEB PY 1994 VL 21 IS 2 BP 209 EP 212 DI 10.1016/0146-6380(94)90155-4 PG 4 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MZ895 UT WOS:A1994MZ89500008 ER PT J AU BEAZLEY, DM LOMDAHL, PS AF BEAZLEY, DM LOMDAHL, PS TI MESSAGE-PASSING MULTICELL MOLECULAR-DYNAMICS ON THE CONNECTION MACHINE 5 SO PARALLEL COMPUTING LA English DT Article DE MOLECULAR DYNAMICS SIMULATION; DISTRIBUTED MEMORY MULTICOMPUTER; CONNECTION MACHINE-5 (CM-5); TIMING RESULTS; MESSAGE-PASSING MODEL; SCALING MODEL ID SIMULATIONS AB We present a new scalable algorithm for short-range molecular dynamics simulations on distributed memory MIMD multicomputers based on a message-passing multi-cell approach. We have implemented the algorithm on the Connection Machine 5 (CM-5) and demonstrate that meso-scale molecular dynamics with more than 10(8) particles is now possible on massively parallel MIMD computers. Typical runs show single particle update-times of 0.15 mus in 2 dimensions (2D) and approximately 1 mus in 3 dimensions (3D) on a 1024 node CM-5 without vector units, corresponding to more than 1.8 Gflops overall performance. We also present a scaling equation which agrees well with actually observed timings. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,ADV COMP LAB,LOS ALAMOS,NM 87545. NR 16 TC 65 Z9 68 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD FEB PY 1994 VL 20 IS 2 BP 173 EP 195 DI 10.1016/0167-8191(94)90080-9 PG 23 WC Computer Science, Theory & Methods SC Computer Science GA NA584 UT WOS:A1994NA58400002 ER PT J AU ROMAY, FJ PUI, DYH LIU, BYH GOLES, RW AF ROMAY, FJ PUI, DYH LIU, BYH GOLES, RW TI CALIBRATION OF THE ELECTRICAL AEROSOL ANALYZER AT SUBAMBIENT PRESSURES SO PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION LA English DT Article ID SIZE AB A commercial Electrical Aerosol Analyzer (EAA, TSI Inc. model 3030) was calibrated experimentally at three subambient pressures (i.e., 0.901, 0.878, and 0.853 atm). Each calibration resulted in a 19 x 11 response matrix and a size dependent sensitivity curve (pA/#/cm3). The results of the calibration were incorporated into a data reduction computer program for size distribution inversion. The accuracy of the calibration was tested by measuring the size distribution of a NaCl polydisperse aerosol at the three subambient pressures. All the tests gave good agreement in the inverted mean geometric diameter and geometric standard deviation of the aerosol number size distribution. C1 UNIV MINNESOTA, DEPT MECH ENGN, PARTICLE TECHNOL LAB, 111 CHURCH ST SE, MINNEAPOLIS, MN 55455 USA. FIM, ESPOL, GUZYAGWIL, ECUADOR. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 10 TC 0 Z9 0 U1 1 U2 2 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0934-0866 J9 PART PART SYST CHAR JI Part. Part. Syst. Charact. PD FEB PY 1994 VL 11 IS 2 BP 159 EP 165 DI 10.1002/ppsc.19940110209 PG 7 WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary SC Chemistry; Science & Technology - Other Topics; Materials Science GA NR168 UT WOS:A1994NR16800008 ER PT J AU BRISSON, JG KOTSUBO, V SWIFT, GW AF BRISSON, JG KOTSUBO, V SWIFT, GW TI THE SUPERFLUID STIRLING REFRIGERATOR, A NEW METHOD FOR COOLING BELOW 0.5-K SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB A new sub-Kelvin refrigerator, the superfluid Stirling cycle refrigerator, uses a working fluid of He-3-He-4 mixture in a Stirling cycle. The thermodynamically active components of the mixture are the He-3, which behaves like a Boltzmann gas, and the phonon-roton gas in the He-4. The superfluid component of the liquid is inert. Two refrigerators have been built, and temperatures of 340 mK have been achieved. RP BRISSON, JG (reprint author), LOS ALAMOS NATL LAB,CONDENSED MATTER & THERMAL PHYS GRP,LOS ALAMOS,NM 87545, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 45 EP 46 DI 10.1016/0921-4526(94)90352-2 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900026 ER PT J AU VERGHESE, S KARADI, C MEARS, CA ORENSTEIN, JO RICHARDS, PL BARFKNECHT, AT AF VERGHESE, S KARADI, C MEARS, CA ORENSTEIN, JO RICHARDS, PL BARFKNECHT, AT TI PICOSECOND RESPONSE OF THE QUASI-PARTICLE CURRENT IN SUPERCONDUCTING TUNNEL-JUNCTIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB We have investigated the response of the quasiparticle tunneling currents in superconductor-insulator-superconductor (SIS) junctions to picosecond electrical pulses. C1 LAWRENCE BERKELEY LAB,CTR MAT SCI,BERKELEY,CA 94720. CONDUCTUS INC,SUNNYVALE,CA 94086. RP VERGHESE, S (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Orenstein, Joseph/I-3451-2015 NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 133 EP 134 DI 10.1016/0921-4526(94)90396-4 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900070 ER PT J AU GAVILANO, JL HUNZIKER, J BUCHI, S FISK, Z OTT, HR AF GAVILANO, JL HUNZIKER, J BUCHI, S FISK, Z OTT, HR TI AL-27 NUCLEAR-MAGNETIC-RESONANCE SPECTRA OF CE3AL11 AT LOW-TEMPERATURES SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB We have measured the Al-27 nuclear magnetic resonance, NMR, spectra oriented powder of the intermetallic compound Ce3Al11 at temperatures between 0.03 K and 20 K, and frequencies of 2.815 MHz, 3.925 MHz, 9.208 MHz and 74.81 MHz. In the paramagnetic state the NMR spectra show the quadrupolar-split contribution of the four inequivalent Al-sites with strongly temperature-dependent Knigth shifts. The NMR spectra indicate the onset of a ferromagnetic phase below 6.2 K transforming into a sinusoidally modulated antiferromagnetic state below 3.3 K. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GAVILANO, JL (reprint author), SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND. RI Gavilano, Jorge/H-4910-2012 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 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 197 EP 198 DI 10.1016/0921-4526(94)90428-6 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900102 ER PT J AU JIN, C LEE, DM POLLACK, L SMITH, EN MARKERT, JT MAPLE, MB HINKS, DG AF JIN, C LEE, DM POLLACK, L SMITH, EN MARKERT, JT MAPLE, MB HINKS, DG TI AC SUSCEPTIBILITY AND NQR MEASUREMENTS ON CECU6 BELOW 5-MK SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB We have measured the zero field ac magnetic susceptibility of single and polycrystalline CeCu6 samples down to 100 muK. For the single crystal sample, the susceptibility shows pronounced anisotropic behavior with respect to the crystal orientation. At approximately 3 mK the susceptibility along two different crystal orientations shows a broad peak, and at 500 muK the susceptibility shows a second peak along one orientation and a plateau along the other. The susceptibility of the polycrystalline sample has a similar peak at 3 mK. NQR measurements are under way to study the Cu nuclear spin system in this compound in order to gain additional information about the nature of the peaks. C1 UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. CORNELL UNIV,CORNELL MICROKELVIN LAB,ITHACA,NY 14853. ARGONNE NATL LAB,ARGONNE,IL 60439. RP JIN, C (reprint author), CORNELL UNIV,CTR MAT SCI,ITHACA,NY 14853, USA. NR 3 TC 9 Z9 9 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 FEB PY 1994 VL 194 BP 207 EP 208 DI 10.1016/0921-4526(94)90433-2 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900107 ER PT J AU SCHMIEDESHOFF, GM FISK, Z SMITH, JL AF SCHMIEDESHOFF, GM FISK, Z SMITH, JL TI ANOMALOUS MAGNETIC TORQUE IN THE HEAVY-FERMION SUPERCONDUCTOR UBE13 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID FIELDS AB Measurements of the magnetic torque acting upon a single crystal of the heavy-fermion superconductor UBe13 have been made at temperatures from 0.5 K to 30.0 K and in magnetic fields to 23 T using a capacitive magnetometer. We find that a large, anomalous contribution to the magnetic torque appears in at low temperatures and in high fields. The anomalous torque coexists with the superconducting state at low temperature. We propose that the anomalous torque reflects the existence of a field-induced magnetic phase transition. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SCHMIEDESHOFF, GM (reprint author), OCCIDENTAL COLL,DEPT PHYS,LOS ANGELES,CA 90041, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 245 EP 246 DI 10.1016/0921-4526(94)90452-9 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900126 ER PT J AU EMERSON, JP FISHER, RA WRIGHT, DA PHILLIPS, NE GORDON, JE MCCARRON, EM AF EMERSON, JP FISHER, RA WRIGHT, DA PHILLIPS, NE GORDON, JE MCCARRON, EM TI QUENCHING AND ANNEALING EFFECTS ON THE SPECIFIC-HEAT OF YBA2CU3O7-DELTA SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB The effect of heat treatments and quenching with no change in oxygen content was studied for a polycrystalline sample of YBCO. Quenching the sample changes the properties drastically, as seen in the specific heat and the resistivity. This study shows that non-superconducting regions, some of which are not associated with Cu2+ moments, can be created in YBCO by heat treatment alone. C1 DUPONT CO INC,WILMINGTON,DE 19880. AMHERST COLL,DEPT PHYS,AMHERST,MA 01002. RP EMERSON, JP (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 2 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 457 EP 458 DI 10.1016/0921-4526(94)90558-4 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900232 ER PT J AU FISHER, RA EMERSON, JP CASPARY, R PHILLIPS, NE STEGLICH, F AF FISHER, RA EMERSON, JP CASPARY, R PHILLIPS, NE STEGLICH, F TI THE LOW-TEMPERATURE SPECIFIC-HEAT OF CECU2GE2 AT 0-KBAR AND 9.5-KBAR SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID PRESSURE; SUPERCONDUCTIVITY; CECU2SI2 AB CeCu2Ge2 orders antiferromagnetically, T(N)approximately4K, and gamma(T) approximately 200 mJ/K2 mole near 0.5K and P=0. A pressure of 9.5 kbar has no measurable effect on T(N); reduces slightly the specific-heat anomaly at T(N); and reduces slightly gamma(T) below 0.7K. These effects of pressure are in striking contrast to the much stronger effects on other heavy-fermion compounds, e.g., CeAl3, URu2Si2 and CeCu2Si2. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. TH DARMSTADT,INST FESTKORPERPHYS,W-6100 DARMSTADT,GERMANY. RP FISHER, RA (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 6 TC 5 Z9 5 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 459 EP 460 DI 10.1016/0921-4526(94)90559-2 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900233 ER PT J AU WRIGHT, DA FISHER, RA PHILLIPS, NE CRAWFORD, MK MCCARRON, EM AF WRIGHT, DA FISHER, RA PHILLIPS, NE CRAWFORD, MK MCCARRON, EM TI SPECIFIC-HEAT OF LA1.875-XNDXSR0.125CUO4 - MAGNETIC AND STRUCTURAL TRANSITIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERCONDUCTIVITY AB Near 70K (La,Ba)2CuO4 undergoes a structural transition from orthorhombic to tetragonal symmetry (LTO-->LTT). Partial substitution of La by Nd produces an additional transition that has been observed in structural studies. The specific heats of La1.475Nd0.4Sr0.125CuO4 and La1.275Nd0.6Sr0.125CuO4 samples exhibit anomalies near 75K, which are associated with these structural transitions, and additional smaller anomalies near 30K, which may be associated with a magnetic transition detected by muSR. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. DUPONT CO INC,WILMINGTON,DE 19808. RP WRIGHT, DA (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 6 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 FEB PY 1994 VL 194 BP 469 EP 470 DI 10.1016/0921-4526(94)90564-9 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900238 ER PT J AU ISRAELSSON, UE STRAYER, DM CHUI, TCP LARSON, M DUNCAN, RV AF ISRAELSSON, UE STRAYER, DM CHUI, TCP LARSON, M DUNCAN, RV TI DYNAMIC MEASUREMENTS NEAR THE LAMBDA-POINT IN A LOW-GRAVITY SIMULATOR ON THE GROUND SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERFLUID TRANSITION; DEPRESSION; HELIUM; HE-4 AB The properties of liquid helium very near the lambda-transition in the presence of a heat current has received recent theoretical and experimental attention. In this regime, gravity induced pressure effects place severe constraints on the types of experiments that can be performed. A new experiment is described which largely overcomes these difficulties by magnetostrictively cancelling gravity influences in the helium sample with a suitable magnetic coil. Design limitations of the technique and a discussion of proposed experiments is presented. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ISRAELSSON, UE (reprint author), JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 4 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 593 EP 594 DI 10.1016/0921-4526(94)90626-2 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900300 ER PT J AU DUNCAN, R AKAU, R GIANOULAKIS, S ISRAELSSON, U CHUI, T AF DUNCAN, R AKAU, R GIANOULAKIS, S ISRAELSSON, U CHUI, T TI SIDEWALL THERMOMETRY PERTURBATIONS TO NONLINEAR HEAT-TRANSPORT NEAR THE LAMBDA-TRANSITION IN HE-4 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERFLUID TRANSITION AB The effect of a sidewall thermometry probe on heat transport measurements in liquid He-4 very close to the superfluid transition is simulated numerically. The effective thermal position of the probe changes with closeness of approach to the superfluid transition. The radial heat flux induced by the sidewall probe is calculated for specific probe designs. C1 JET PROP LAB,PASADENA,CA 91109. RP DUNCAN, R (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 4 TC 5 Z9 5 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 FEB PY 1994 VL 194 BP 603 EP 604 DI 10.1016/0921-4526(94)90631-9 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900305 ER PT J AU CHEONG, SW HWANG, HY BATLOGG, B COOPER, AS CANFIELD, PC AF CHEONG, SW HWANG, HY BATLOGG, B COOPER, AS CANFIELD, PC TI ELECTRON-HOLE DOPING OF THE METAL-INSULATOR-TRANSITION COMPOUND RENIO3 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID ND AB We have studied the effects of electron and hole doping on the electronic properties of Nd(Pr)NiO3, charge-transfer compounds undergoing a metal-insulator transition. Electron-hole asymmetry associated with the suppression of the metal-insulator transition was observed. In addition, the Hall coefficient was found to vanish at the transition temperature. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP CHEONG, SW (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Hwang, Harold/I-6943-2012; Canfield, Paul/H-2698-2014 NR 4 TC 19 Z9 19 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1087 EP 1088 DI 10.1016/0921-4526(94)90873-7 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900547 ER PT J AU SHUTT, T AUBOURG, E AKERIB, D BARNES, PD CUMMINGS, A DASILVA, A EMES, J HALLER, EE LANGE, AE ROSS, RR SADOULET, B SMITH, G STOCKWELL, W WHITE, S YOUNG, BA AF SHUTT, T AUBOURG, E AKERIB, D BARNES, PD CUMMINGS, A DASILVA, A EMES, J HALLER, EE LANGE, AE ROSS, RR SADOULET, B SMITH, G STOCKWELL, W WHITE, S YOUNG, BA TI SIMULTANEOUS MEASUREMENT OF PHONONS AND IONIZATION PRODUCED BY PHOTONS IN A 60-G GERMANIUM CRYSTAL AT 25MK - A NEW METHOD FOR STUDYING IMPURITY SITES IN SEMICONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID GE AB We report on the simultaneous measurement of charges and phonons created by particle interactions in a semiconductor at 20 mK. We find that the phonon energy is correlated to the number of charges collected, an effect we model in terms of capture of charges by impurities. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. RP SHUTT, T (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 5 TC 0 Z9 0 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 FEB PY 1994 VL 194 BP 1201 EP 1202 DI 10.1016/0921-4526(94)90930-X PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900604 ER PT J AU KLEMM, RA AF KLEMM, RA TI DIMENSIONAL CROSSOVER IN THE TORQUE IN A LAYERED SUPERCONDUCTOR SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID CRITICAL-FIELD; VORTICES AB The procedure of Bulaevskii, Ledvij, and Kogan for evaluating the line energy of a single, straight vortex in the Lawrence-Doniach model in the linearized phase-only approximation is modified to take accurate account of the vortex core cross-sections. Dimensional crossover effects are found to be pronounced, with oscillations in the angular dependence of the torque for theta congruent-to pi/2 and T almost-equal-to T* < T(c). RP KLEMM, RA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 8 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 FEB PY 1994 VL 194 BP 1367 EP 1368 DI 10.1016/0921-4526(94)91183-5 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500008 ER PT J AU MONTAMBAUX, G DUPUIS, N DEMELO, CARS AF MONTAMBAUX, G DUPUIS, N DEMELO, CARS TI QUASI-ONE-DIMENSIONAL SUPERCONDUCTORS IN STRONG MAGNETIC-FIELD SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB We determine the phase diagram of a quasi-one-dimensional conductor (weakly coupled chains system with an open Fermi surface) in a magnetic field. The superconducting state evolves from an Abrikosov vortex lattice in weak field to a Josephson vortex lattice in very strong field, with a reentrance of the superconducting phase. Between these two limits, there is a cascade of first order transitions between different superconducting phases due to commensurability effects between the crystalline lattice and the order parameter. In these phases, the order parameter has a laminar structure. C1 ARGONNE NATL LAB,CTR SCI & TECHNOL SUPERCONDUCTIV,ARGONNE,IL 60439. RP MONTAMBAUX, G (reprint author), UNIV PARIS 11,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1383 EP 1384 DI 10.1016/0921-4526(94)91191-6 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500016 ER PT J AU TRIVEDI, N MAKIVIC, M AF TRIVEDI, N MAKIVIC, M TI BOSONS IN A RANDOM POTENTIAL - EVIDENCE FOR NEW LOW-ENERGY EXCITATIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERCONDUCTOR-INSULATOR TRANSITION; FILMS AB We study the T = 0 critical properties of the superfluid-insulator transition in 2D hard core bose systems with disorder. Using quantum Monte Carlo simulations and finite size scaling on up to 64x64 size lattices we find the dynamical exponent z = 0.5 +/- 0.05 and the compressibility kappa is finite at the transition. These conclusion differ from the existing scaling theory that argues for z = 2 based on a finite kappa at the transition. We also find that in the presence of disorder, the boson model and the quantum rotor model are in different universality classes. Our results are suggestive of new low lying collective excitations in the disordered system that are modified from usual phonons. Such a conjecture is further supported by the anomalous temperature dependence of the specific heat deep within the superfluid phase which deviates from the expected C(upsilon) approximately T2 behavior for phonons. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RP TRIVEDI, N (reprint author), ARGONNE NATL LAB,DIV MAT SCI,BLDG 223,9700 S CASS AVE,ARGONNE,IL 60439, USA. 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 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1391 EP 1392 DI 10.1016/0921-4526(94)91195-9 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500020 ER PT J AU RANDERIA, M DEMELO, CARS ENGELBRECHT, JR AF RANDERIA, M DEMELO, CARS ENGELBRECHT, JR TI CROSSOVER FROM BCS TO BOSE SUPERCONDUCTIVITY - A FUNCTIONAL INTEGRAL APPROACH SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID CONDENSATION; GAS AB We use a functional integral formulation to study the crossover from cooperative Cooper pairing to the formation and condensation of tightly bound pairs in a 3D continuum model of fermions with attractive interactions. The inadequacy of a saddle point approximation with increasing coupling is pointed out, and the importance of temporal (quantum) fluctuations for normal state properties at intermediate and strong coupling is emphasized. In addition to recovering the Nozieres-Schmitt-Rink interpolation scheme for T(c), and the Leggett variational results for T = 0, we also present results for evolution of the time-dependent Ginzburg-Landau equation and collective mode spectrum as a function of the coupling. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP RANDERIA, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 7 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1409 EP 1410 DI 10.1016/0921-4526(94)91204-1 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500029 ER PT J AU QIANG, L SHIBUTANI, K SUENAGA, M SHIGAKI, I OGAWA, R AF QIANG, L SHIBUTANI, K SUENAGA, M SHIGAKI, I OGAWA, R TI REVERSIBLE MAGNETIZATION OF BI2SR2CACU2O8 SINGLE-CRYSTALS AT 30-K-LESS-THAN-OR-EQUAL-TO-T-LESS-THAN-TC SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID HIGH-TC SUPERCONDUCTORS; FLUCTUATIONS AB We report magnetization measurements on high-quality Bi2Sr2CaCu2O8 single crystals in H // the c-axis. Our reversible magnetization data at 30 K less-than-or-equal-to T < T(c) show strong deviations from the linear dependence of M on ln(H) in the intermediate-field region. The Ginzburg-Landau parameter kappa, obtained by using the Hao-Clem variational model, was found to vary significantly with the field range for the data fitting. This unusual behavior can not be explained by the thermal fluctuations of the vortices in layered superconductors. C1 KOBE STEEL LTD,CTR SUPERCONDUCTING & CRYOGEN TECHNOL,NISHI KU,KOBE 65122,JAPAN. RP QIANG, L (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. 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 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1501 EP 1502 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500075 ER PT J AU KIM, YC JANG, MS HAN, SK THOMPSON, JR CHRISTEN, DK AF KIM, YC JANG, MS HAN, SK THOMPSON, JR CHRISTEN, DK TI ANISOTROPIC LOWER CRITICAL FIELDS OF ALIGNED HIGH-TC SUPERCONDUCTING Y1BA2(CU1-XFEX)3OZ POWDER COMPOSITES SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID TEMPERATURE-DEPENDENCE; SURFACE BARRIERS; CRYSTAL AB Uniaxially-aligned powder composites of Y1Ba2(Cu1-xFex)3Oz for x less-than-or-equal-to 0.1 are formed by magnetic alignment of particles suspended in epoxy. The anisotropic lower critical field H(c1) was determined from a procedure based on the Bean's critical state model to pick up the onset of flux penetration in magnetization curves. For both field orientations H\\c and H\\ab at 4.2 K, H(c1) decrease linearly with increasing Fe content from H(c1) = 298 Oe to 32 Oe and from 101 Oe to 3 Oe, respectively. The temperature dependencies of H(c1) for both H\\c and H\\ab are such that it tends to decrease linearly with increasing temperature. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP KIM, YC (reprint author), PUSAN NATL UNIV,DEPT PHYS,PUSAN 609735,SOUTH KOREA. NR 4 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1547 EP 1548 DI 10.1016/0921-4526(94)91273-4 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500098 ER PT J AU THOMPSON, JR CHRISTEN, DK OSSANDON, JG AF THOMPSON, JR CHRISTEN, DK OSSANDON, JG TI EQUILIBRIUM MAGNETIZATION OF THE HIGH-TC SUPERCONDUCTOR TL2CA2BA2CU3O10+DELTA AND FLUCTUATION EFFECTS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID REVERSIBLE MAGNETIZATION AB The mixed state, static magnetization of the high temperature superconductor Tl2Ca2Ba2Cu3O10+delta is strongly affected by fluctuation effects. The experimental magnetization was studied with magnetic field applied parallel to the crystalline c-axes and analyzed using the recent theory of Kogan et al. [Phys. Rev. Lett. 70, 1870 (1993)]. In general, the experiments are well described by this theory. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. UNIV TALCA,FAC NAT RESOURCES,TALCA,CHILE. RP THOMPSON, JR (reprint author), OAK RIDGE NATL LAB,BLDG 3115,OAK RIDGE,TN 37831, USA. NR 5 TC 5 Z9 5 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 FEB PY 1994 VL 194 BP 1557 EP 1558 DI 10.1016/0921-4526(94)91278-5 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500103 ER PT J AU YAGASAKI, K GSCHNEIDNER, KA DELONG, LE AF YAGASAKI, K GSCHNEIDNER, KA DELONG, LE TI MAGNETIC-BEHAVIOR OF U6CO IN THE SUPERCONDUCTING STATE SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID U6FE; U6MN; U6NI AB Two superconducting transitions were observed in U6Co by magnetic measurements, T(cH)=2.69K and T(cL)=2.24K. The behaviors of the T(c)'s are different above and below H=1T. The effect of field cooling (FC) at 1.92T on H(c2) positive, i.e. FC increases the transition temperature. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV KENTUCKY,LEXINGTON,KY 40506. RP YAGASAKI, K (reprint author), UNIV RYUKYUS,COLL SCI,OKINAWA 90301,JAPAN. NR 8 TC 0 Z9 0 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1559 EP 1560 DI 10.1016/0921-4526(94)91279-3 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500104 ER PT J AU YAGASAKI, K GSCHNEIDNER, KA DELONG, LE AF YAGASAKI, K GSCHNEIDNER, KA DELONG, LE TI THE LOWER CRITICAL-FIELD OF U6FE SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID U6CO; SUPERCONDUCTORS; U6MN AB The magnetization curves of U6Fe were measured at several constant temperatures by a SQUID magnetometer. The lower critical field H(c1) was determined on the basis of Bean's model. H(c1) follows a 1-(T/T(C))4 dependence and its extrapolated value at T=0 is 92 Gauss. H(c1) is three orders of magnitude smaller than H(c2). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV KENTUCKY,LEXINGTON,KY 40506. RP YAGASAKI, K (reprint author), UNIV RYUKYUS,COLL SCI,OKINAWA 90301,JAPAN. NR 8 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1561 EP 1562 DI 10.1016/0921-4526(94)91280-7 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500105 ER PT J AU LEE, JY LEMBERGER, TR FOLTYN, S WU, XD AF LEE, JY LEMBERGER, TR FOLTYN, S WU, XD TI MEASUREMENT OF PENETRATION DEPTH-LAMBDA(T) IN YBA2CU3O7-DELTA THIN-FILM SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID TEMPERATURE-DEPENDENCE; DEPTH; SUPERCONDUCTORS AB We present the magnetic penetration depth lambda(T) in two laser ablated YBa2Cu3O7-delta thin films, determined by the two-coil method. The slope of 1/lambda2(T) near T(c), the only exactly measurable quantity, extrapolates to 930 angstrom at T = 0, which compares well with 830 angstrom in the high quality single crystal recently reported by Hardy et al., and which exhibited a linear T dependence at low T. For T < 30K, we find lambda(T)/lambda(0)-1 = a(T/T(c))2 where a=0.5. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LEE, JY (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. NR 11 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1587 EP 1588 DI 10.1016/0921-4526(94)91293-9 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500118 ER PT J AU GOETTEE, JD BROOKS, JS SKOCPOL, WJ SMITH, JL RICKEL, DG FREEMAN, BL FOWLER, CM MANKIEWICH, PM DEOBALDIA, EI OMALLEY, ML AF GOETTEE, JD BROOKS, JS SKOCPOL, WJ SMITH, JL RICKEL, DG FREEMAN, BL FOWLER, CM MANKIEWICH, PM DEOBALDIA, EI OMALLEY, ML TI MEGAGAUSS EXPLORATION OF H-C2 AND VORTEX DYNAMICS IN YBA2CU3O7-X THIN-FILMS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SINGLE-CRYSTAL YBA2CU3OX; UPPER CRITICAL-FIELD AB New measurements of the dc resistivity rho(TH) of YBa2Cu3O7-x (YBCO) below 20K and in magnetic fields >100T (>1 Megagauss) show H(c2) parallel-to c-axis is near 140T at low temperature. The onset of hydrodynamic vortex flow is also clearly seen and is in agreement with existing data. We have employed a linear fit of sample voltage vs. dB/dt at low fields to systematically remove inductive coupling from the signal voltage and extract rho(T,H). C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. AT&T BELL LABS,HOLMDEL,NJ 07728. MIT,LINCOLN LAB,LEXINGTON,MA 02173. RP GOETTEE, JD (reprint author), BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215, USA. RI Goettee, Jeffrey/L-4926-2015 NR 9 TC 11 Z9 11 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1805 EP 1806 DI 10.1016/0921-4526(94)91402-8 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500227 ER PT J AU BURLACHKOV, L VINOKUR, VM AF BURLACHKOV, L VINOKUR, VM TI SURFACE EFFECT ON TRANSPORT-PROPERTIES IN HTSC SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERCONDUCTORS; BARRIERS; CRYSTALS AB The critical transport current due to surface barriers is found for high-temperature superconductors and shown to decrease as 1/H for large magnetic fields. A self-consistent problem of the current distribution between the flux ''entry'' and ''exit'' surfaces is solved. The surface contribution is proved to be not affected by thermal fluctuations of vortex lines. Thus the surface effects on the transport properties are especially important at high-temperatures where the bulk pinning is reduced by temperature. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BURLACHKOV, L (reprint author), BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. NR 6 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1819 EP 1820 DI 10.1016/0921-4526(94)91409-5 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500234 ER PT J AU CHRISTEN, DK ZHU, S KLABUNDE, CE KERCHNER, HR THOMPSON, JR FEENSTRA, R CIVALE, L PHILLIPS, JM AF CHRISTEN, DK ZHU, S KLABUNDE, CE KERCHNER, HR THOMPSON, JR FEENSTRA, R CIVALE, L PHILLIPS, JM TI EFFECTS OF COLUMNAR DEFECTS ON THE SUPERCONDUCTING PROPERTIES OF Y1BA2CU3O7-DELTA - LIMITS TO THE IRREVERSIBILITY LINE SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID VORTEX-LATTICE; SINGLE-CRYSTALS; YBA2CU3O7-DELTA; IRRADIATION AB A series of YBa2Cu3O7-delta(YBCO) epitaxial films and crystals were irradiated with energetic heavy ions (Sn30+ or Ag29+ at energy 0.58 GeV) to produce columnar defects of highly disordered material. The irreversibility lines, B*(T), show enhancement due to the increased pinning. However, while B* does not exceed that observed in the highest-J(c) as-grown epitaxial thin films, the values approach the proposed vortex melting line determined by a number of experiments on nearly defect-free single crystals. These results are interpreted in terms of the predicted upper limit of pinning energies in anisotropic superconductors, and the thermally-induced decoupling of vortex segments. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP CHRISTEN, DK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 12 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1825 EP 1826 DI 10.1016/0921-4526(94)91412-5 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500237 ER PT J AU KERCHNER, HR THOMPSON, JR SUNS, YR CHRISTEN, DK THOMSON, JO SALES, BC CHAKOUMAKOS, B CIVALE, L MARWICK, AD AF KERCHNER, HR THOMPSON, JR SUNS, YR CHRISTEN, DK THOMSON, JO SALES, BC CHAKOUMAKOS, B CIVALE, L MARWICK, AD TI ENHANCED VORTEX-PINNING STRENGTH AND MAGNETIC-IRREVERSIBILITY VIA COLUMNAR DEFECTS IN SINGLE-CRYSTAL BI2SR2CACU2O8 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERCONDUCTORS; IRRADIATION AB To enhance vortex pinning in the high-T(c) superconductor Bi2Sr2CaCu2O8, single crystals were irradiated with energetic heavy ions to create columnar defects. Irradiations were made at various angles from the c-axis. The Pinning energy U0 was investigated by ac magnetometry near B(T(irr)), the limit of quasistatic magnetic irreversibility. Irradiation increased U0 by a factor of approximately 3, relatively independent of the ion-beam exposure, which increased both J(c) and the irreversible B-T regime. Independence of J(c) and U0 from the magnetic-field orientation suggests the predominance of strong pins interacting with 2-D pancake vortices. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP KERCHNER, HR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 7 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1903 EP 1904 DI 10.1016/0921-4526(94)91451-6 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500276 ER PT J AU XU, M FINNEMORE, DK CRABTREE, GW VINOKUR, VM ZHANG, K DABROWSKI, B HINKS, DG AF XU, M FINNEMORE, DK CRABTREE, GW VINOKUR, VM ZHANG, K DABROWSKI, B HINKS, DG TI RELAXATION OF HYSTERESIS LOOP IN A SINGLE-CRYSTAL OF YBA2CU4O8 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID FLUX AB Magnetic relaxation has been studied for Y1Ba2Cu4O8 in order to look for changes in the relaxation rates that arise because different pinning mechanisms dominate in different magnetic field regimes. In the low field regime where the Bean-Livingston surface barrier dominates, the vortices exit on a field decreasing branch with a relaxation rate about ten times faster than they enter on a corresponding field increasing branch. In high magnetic fields where bulk pinning dominates, the relaxation rates for field increasing and field decreasing are essentially the same. C1 UNIV CHICAGO,CHICAGO,IL 60637. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP XU, M (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. 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 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1915 EP 1916 DI 10.1016/0921-4526(94)91457-5 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500282 ER PT J AU WOSNITZA, J CRABTREE, GW CARLSON, KD WANG, HH WILLIAMS, JM AF WOSNITZA, J CRABTREE, GW CARLSON, KD WANG, HH WILLIAMS, JM TI FERMIOLOGY AND DE-HAAS-VAN-ALPHEN EFFECT OF BETA(ET)2IBR2 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB The Fermi surface of the organic superconductor beta-(ET)2IBr2 investigated by measurements of the de Haas - van Alphen (dHvA) effect has been found to have the typical two-dimensional cylindrical form. A small amount of corrugation could be quantitatively determined by the distinctive angular dependence of beating nodes. The existence of up to four almost identical frequencies in the dHvA signal may be explained by magnetic interaction effects within the samples. Due to the 1/cos(THETA)-behavior of the effective mass spin-splitting zeros could be detected. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,DIV MAT SCI & CHEM,ARGONNE,IL 60439. RP WOSNITZA, J (reprint author), UNIV KARLSRUHE,INST PHYS,ENGESSERSTR 7,W-7500 KARLSRUHE,GERMANY. NR 9 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 2007 EP 2008 DI 10.1016/0921-4526(94)91503-2 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500328 ER PT J AU GLOOS, K DULLMANN, D WEIS, M CANFIELD, PC SPARN, G STEGLICH, F AF GLOOS, K DULLMANN, D WEIS, M CANFIELD, PC SPARN, G STEGLICH, F TI MICROCONTACTS OF HEAVY-FERMION CECU2GE2 WITH SIMPLE METALS AT 0.1K-LESS-THAN-T-LESS-THAN-5K SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB The differential microcontact resistance between monocrystalline CeCu2Ge2 and simple metals as well as the thermal expansion of CeCu2Ge2 has been investigated. We observed spectra with smooth maxima around +/-3mV, indicating the destruction of AF magnetic order in CeCu2Ge2 and spectra with additional structures that vanish around 0.6K, 1.1K, or 2.6K. The shape of these anomalies and the respective temperatures point to CeCu2Ge2 becoming locally superconducting below these temperatures because of the high pressure exerted by the counter electrodes. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GLOOS, K (reprint author), TH DARMSTADT,INST FESTKORPERPHYS,D-64289 DARMSTADT,GERMANY. RI Sparn, Guenter/F-5120-2013; Canfield, Paul/H-2698-2014 NR 7 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 2019 EP 2020 DI 10.1016/0921-4526(94)91509-1 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500334 ER PT J AU LIN, SW JIN, C ZHANG, H KETTERSON, JB LEE, DM HINKS, DG LEVY, M SARMA, BK AF LIN, SW JIN, C ZHANG, H KETTERSON, JB LEE, DM HINKS, DG LEVY, M SARMA, BK TI SUPERCONDUCTING PHASE-DIAGRAM OF UPT3 FOR FIELD ALONG NONSYMMETRICAL ORIENTATION FROM ULTRASONIC MEASUREMENTS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID ORDER-PARAMETER AB A new H-T superconducting phase diagram for UPt3 with the field at 45-degrees to the c-axis from ultrasonic velocity measurements is presented. The H(FL)(T) transition line is found to merge with the H(c2)(T) line and the T(c*)(H) line appears to terminate in the H(FL)(T) line at a different point. C1 CORNELL UNIV,ATOM & SOLID STATE PHYS LAB,ITHACA,NY 14853. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LIN, SW (reprint author), UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53201, USA. RI Ketterson, John/B-7234-2009 NR 9 TC 1 Z9 1 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 FEB PY 1994 VL 194 BP 2023 EP 2024 DI 10.1016/0921-4526(94)91511-3 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500336 ER PT J AU SHIVARAM, BS BOUKHNY, M BULLOCK, GL HINKS, DG AF SHIVARAM, BS BOUKHNY, M BULLOCK, GL HINKS, DG TI THE SUPERCONDUCTING PHASES OF UPT3 UNDER UNIAXIAL-STRESS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID DEPENDENCE AB Using a continuous wave ultrasonic technique we have studied the superconducting phases of UPt3 under both uniaxial stress, sigma, and magnetic field, H, parallel to the c-axis. We observe the tetracritical point in the H-T plane shift to lower magnetic fields and higher temperatures with increasing stress, until it vanishes at approximately 2.5 kbar. Further increase of stress has two effects on the lower transition that survives - it continues to separate increasingly from the upper critical field but with the property: the magnitude of the sound velocity jump at the transition decreases with increasing temperature. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SHIVARAM, BS (reprint author), UNIV VIRGINIA,JESSE BEAMS LAB PHYS,CHARLOTTESVILLE,VA 22901, USA. NR 7 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 FEB PY 1994 VL 194 BP 2027 EP 2028 DI 10.1016/0921-4526(94)91513-X PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500338 ER PT J AU WACENOVSKY, M SAUERZOPF, FM SCHALK, RM WEBER, HW MURAKAMI, M BARAN, M FINNEMORE, DK AF WACENOVSKY, M SAUERZOPF, FM SCHALK, RM WEBER, HW MURAKAMI, M BARAN, M FINNEMORE, DK TI A COMPARISON OF EXPERIMENTAL-TECHNIQUES TO DETERMINE IRREVERSIBILITY LINES AND CRITICAL-CURRENT DENSITIES IN MELT-PROCESSED YBCO SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID FLUX AB We report on a comparison of methods (SQUID, ac) commonly employed to derive irreversibility lines (IL) and critical current densities of melt processed YBCO matarials. As expected from thermal activation theory, the results for J(c) as well as for the position of the IL in the H-T-diagram are clearly dependent on the characteristic time scale of the measuring technique. C1 INT SUPERCONDUCT TECHNOL CTR,SUPERCOND RES LAB,TOKYO 135,JAPAN. POLISH ACAD SCI,INST PHYS,PL-02668 WARSAW,POLAND. POLISH ACAD SCI,INST PHYS,PL-02668 WARSAW,POLAND. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP WACENOVSKY, M (reprint author), UNIV VIENNA,ATOMINST,A-1020 VIENNA,AUSTRIA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 2139 EP 2140 DI 10.1016/0921-4526(94)91569-5 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500394 ER PT J AU FABREGA, L CRUSELLAS, MA FONTCUBERTA, J OBRADORS, X PINOL, S WELP, U CRABTREE, GW AF FABREGA, L CRUSELLAS, MA FONTCUBERTA, J OBRADORS, X PINOL, S WELP, U CRABTREE, GW TI MAGNETIC-FIELD-INDUCED SUPERCONDUCTING FLUCTUATIONS IN L2-XCEXCUO4-Y SINGLE-CRYSTALS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SCALING BEHAVIOR; TRANSPORT; LOCALIZATION; TRANSITION AB Magnetization and electrical transport measurements under magnetic field H parallel-to c are reported for L2-xCexCuO4 single crystals. Close to the upper critical field line a broad region is found were field induced fluctuations dominate the reversible electromagnetic response of the crystals. Excellent scalings of 2D nature are found for enhanced diamagnetism and excess conductivity, which in addition allow to extract a linear H(c2)(T) dose to T(c). C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP FABREGA, L (reprint author), CSIC,INST CIENCIA MAT,CAMPUS UAB,E-08193 BARCELONA,SPAIN. RI Obradors, Xavier/A-8146-2012; Fontcuberta, Josep /A-7114-2013; Fabrega, Lourdes/L-5090-2014; OI Fabrega, Lourdes/0000-0002-2611-8037; Fontcuberta, Josep/0000-0002-7955-2320 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 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 2253 EP 2254 DI 10.1016/0921-4526(94)91626-8 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500451 ER PT J AU LIU, SH KLEMM, RA AF LIU, SH KLEMM, RA TI DENSITY-OF-STATES AND TUNNELING CHARACTERISTICS OF LAYERED SUPERCONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID COPPER-OXIDE SUPERCONDUCTORS; GAP ANISOTROPY AB We have studied the structure of the density-of-states (DOS) curves and tunneling characteristics of layered superconductors with two distinct layers in a unit cell. In general, the peaks of the DOS curves do not correspond to energy gaps of each layer, but depend on the gaps and the interlayer hopping strengths in a complex manner. This makes the interpretation of tunneling data of layered superconductors much less straightforward than isotropic superconductors. Our simulated tunneling characteristics bear certain resemblance to experimental results. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LIU, SH (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 9 TC 0 Z9 0 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 FEB PY 1994 VL 194 BP 2417 EP 2418 DI 10.1016/0921-4526(94)91708-6 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500533 ER PT J AU BUZDIN, A FEINBERG, D AF BUZDIN, A FEINBERG, D TI ANISOTROPIC SUPERCONDUCTING FLUCTUATIONS IN A MAGNETIC-FIELD - SPECIFIC-HEAT, MAGNETIZATION AND ANGULAR-DEPENDENCE SO PHYSICA C LA English DT Article ID SINGLE-CRYSTAL; SUSCEPTIBILITY; TRANSITION; STATE AB The Gaussian theory of superconducting fluctuations in an uniform magnetic field is presented above the H-c2 line, for an anisotropic superconductor. The situation of an arbitrary orientation of the field is investigated by means of a scaling transformation. The specific heat and the diamagnetic susceptibility are calculated. In particular the fluctuation torque is compared to the mean-field one just below H-c2 and in the London regime. A comparison is made with existing experiments on specific heat and torque in high-T-c compounds. C1 UNIV JOSEPH FOURIER,CNRS,ETUD PROPERIETES ELECTR SOLIDES LAB,BP 166,F-38042 GRENOBLE 9,FRANCE. RP BUZDIN, A (reprint author), ARGONNE NATL LAB,S CASS AVE,ARGONNE,IL 60439, USA. RI Buzdin, Alexander/I-6038-2013 NR 15 TC 18 Z9 18 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 FEB 1 PY 1994 VL 220 IS 1-2 BP 74 EP 80 DI 10.1016/0921-4534(94)90886-9 PG 7 WC Physics, Applied SC Physics GA MW368 UT WOS:A1994MW36800010 ER PT J AU PAPP, T CAMPBELL, JL RAMAN, S AF PAPP, T CAMPBELL, JL RAMAN, S TI LINE-SHAPE EFFECTS ON THE DETERMINATION OF COSTER-KRONIG PROBABILITIES USING SI(LI) X-RAY-DETECTORS SO PHYSICAL REVIEW A LA English DT Article ID TRANSITION-PROBABILITY; FLUORESCENCE YIELDS; INTENSITY AB The great majority of measured values of the Coster-Kronig probability f(23) derive from x-ray coincidence experiments using radionuclide sources or from synchrotron-radiation excitation of thin foils. Very little attention has been paid in published work to the role of line-shape effects and satellites in the x-ray spectra that are obtained. It is shown that this neglect can influence f(23) values derived from such measurements. This may explain in part the well-established trends for measured f(23) values to fall below the theoretical predictions for elements with atomic number Z < 90 and to fall above when Z > 92. In elemental analysis techniques based upon x-ray emission spectroscopy, where a database of atomic parameters such as Coster-Kronig probabilities is used, the same approximations are made in treating the spectra. Until a more sophisticated approach to spectrum reduction is developed, it may be preferable in this context to use ''nominal'' Coster-Kronig probabilities derived from experiment in preference to theoretical values. C1 HUNGARIAN ACAD SCI, ATOMKI, INST NUCL RES, H-4001 DEBRECEN, HUNGARY. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP PAPP, T (reprint author), UNIV GUELPH, GUELPH WATERLOO PROGRAM GRAD WORK PHYS, GUELPH N1G 2W1, ON, CANADA. NR 26 TC 18 Z9 18 U1 0 U2 1 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 FEB PY 1994 VL 49 IS 2 BP 729 EP 736 DI 10.1103/PhysRevA.49.729 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA MW352 UT WOS:A1994MW35200018 ER PT J AU PAPP, T CAMPBELL, JL RAMAN, S AF PAPP, T CAMPBELL, JL RAMAN, S TI ANGULAR-CORRELATION OF K-L X-RAY CASCADES IN GADOLINIUM SO PHYSICAL REVIEW A LA English DT Article ID COSTER-KRONIG; FLUORESCENCE YIELDS AB Angular correlation parameters (A(22)) between the K alpha(1) and L(3) x rays were measured for gadolinium in the electron-capture decay of the isotope Tb-157. The results are A(22)(K alpha(1)-Ll)=0.272+/-0.042, A(22)(K alpha(1)-L alpha)=0.032+/-0.015, A(22)(K alpha 1-L beta(2,15))=0.061(+/-)0.018. These values are in very good agreement with the theoretical calculations of Scofield [Lawrence Livermore Laboratory Report No. UCRL 51231, 1972 (unpublished)]; however, they differ from the earlier experimental data for the K alpha(1)-Ll cascade in the 60 2, the transition is second order near die triple point but first order at lower temperatures. C1 N DAKOTA STATE UNIV,DEPT PHYS,FARGO,ND 58105. RP FISHMAN, RS (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Fishman, Randy/C-8639-2013 NR 19 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1994 VL 49 IS 5 BP 3308 EP 3316 DI 10.1103/PhysRevB.49.3308 PG 9 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900041 ER PT J AU DAGOTTO, E RIERA, J CHEN, YC MOREO, A NAZARENKO, A ALCARAZ, F ORTOLANI, F AF DAGOTTO, E RIERA, J CHEN, YC MOREO, A NAZARENKO, A ALCARAZ, F ORTOLANI, F TI SUPERCONDUCTIVITY NEAR PHASE-SEPARATION IN MODELS OF CORRELATED ELECTRONS SO PHYSICAL REVIEW B LA English DT Article ID T-J MODEL; 2-DIMENSIONAL HUBBARD-MODEL; LATTICE GAUGE-THEORY; CHARGE-TRANSFER; EXACT-DIAGONALIZATION; OPTICAL CONDUCTIVITY; PAIRING CORRELATIONS; DYNAMIC PROPERTIES; SPIN FLUCTUATIONS; LA-139 NMR AB Numerical and analytical studies of several models of correlated electrons are discussed. Based on exact diagonalization and variational Monte Carlo techniques, we have found indications that the two-dimensional t-J model superconducts near phase separation in the regime of quarter-filling density, in agreement with previous results reported by Dagotto and Riera [Phys. Rev. Lett. 70, 682 (1993)]. At this density the dominant channel is d(x2-y2), but a transition to s-wave superconductivity is observed decreasing the electronic density. In addition, the one-band t-U-V model has also been studied using a mean-field approximation. An interesting region of d(x2-y2), superconductivity near phase separation is observed in the phase diagram, and its implications for recent self-consistent studies of d-wave condensates in the context of the high-T-c cuprates are briefly discussed. Finally, the two-band Hubbard model on a chain is also analyzed. Superconducting correlations near phase separation exist in this model, as it occurs in the t-J model. Based on these nontrivial examples it is conjectured that electronic models tend to have superconducting phases in the vicinity of phase separation, and this regime of parameter space should be explored first when a new model for superconductivity is proposed. Reciprocally, if it is established that a model does not phase separate, even in an extended parameter space, then we believe that its chances of presenting a superconducting phase are considerably reduced. C1 FLORIDA STATE UNIV, MARTECH, TALLAHASSEE, FL 32306 USA. OAK RIDGE NATL LAB, CTR COMPUTAT INTENS PHYS, DIV PHYS, OAK RIDGE, TN 37831 USA. VANDERBILT UNIV, DEPT PHYS & ASTRON, NASHVILLE, TN 37235 USA. NATL TSING HUA UNIV, DEPT PHYS, HSINCHU 30043, TAIWAN. UNIV FED SAO CARLOS, DEPT FIS, SAO CARLOS, SP, BRAZIL. UNIV BOLOGNA, INST NAZL FIS NUCL, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY. RP FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, DEPT PHYS, TALLAHASSEE, FL 32306 USA. RI Riera, Jose/A-1234-2008 OI Riera, Jose/0000-0003-4546-1137 NR 85 TC 107 Z9 107 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1994 VL 49 IS 5 BP 3548 EP 3565 DI 10.1103/PhysRevB.49.3548 PG 18 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900072 ER EF