FN Thomson Reuters Web of Science™ VR 1.0 PT J AU RICHTER, FM ROWLEY, DB DEPAOLO, DJ AF RICHTER, FM ROWLEY, DB DEPAOLO, DJ TI SR ISOTOPE EVOLUTION OF SEAWATER - THE ROLE OF TECTONICS SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article ID INDIA-ASIA COLLISION; SEA-WATER; PHANEROZOIC TIME; STRONTIUM ISOTOPES; GEOCHEMICAL CYCLES; STRATIGRAPHY; OCEAN; HIMALAYA; UPLIFT; RATIO AB We use a high-resolution seawater Sr isotopic evolution curve for the last 100 m.y. in conjunction with modern riverine Sr flux measurements, and also geologic, tectonic and geochronological data, to make the case for a close relationship between seawater Sr isotopic composition and the India-Asia continental collision. Using a simple seawater Sr budget model we begin by showing that the Sr flux associated with alteration of seafloor basalts is too small and does not have the right time evolution to account for much of the seawater Sr isotopic curve of the last 100 m.y. The flux of dissolved Sr carried by rivers originating in the Himalaya-Tibet region on the other hand is presently a significant fraction of the global Sr budget. We calculate how this riverine flux would have had to change with time in order to match the observed seawater Sr isotopic curve and find that the riverine flux remains relatively constant prior to the collision of India with Asia but then increases very significantly after collision. We note that the period of most rapid change in seawater Sr isotopic ratio, from 20 Ma to 15 Ma, is also a period of exceptionally high erosion in parts of the Himalayas and the Tibetan Plateau. As further evidence that Sr derived from the collision of India with Asia plays a major role in the Sr isotopic evolution of seawater we show that the total amount erosion of the Himalaya-Tibetan Plateau since collision, which we calculate separately, represents a total amount of Sr that is very nearly the same as the cumulative amount required by the Sr isotopic change of seawater since collision. The relationship between erosion and riverine Sr flux allows us to use the Sr isotopic evolution of seawater to reconstruct a history of erosion since collision, and we find that the erosion rate accelerates with time since collision, with the present having the largest rate. When we apply the Sr budget model to the entire Phanerozoic using a new compilation of deformed continental area versus time we find that we can account for the large-scale structure of the seawater Sr isotopic curve, but fail to reproduce several local maxima and minima, especially in the period 100-300 Ma. The present high Sr-87/Sr-86 of seawater and similar highs in the Devonian and Cambrian do correlate with extensive deformation on the continents. C1 UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY CTR ISOTOPE GEOCHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP RICHTER, FM (reprint author), UNIV CHICAGO,DEPT GEOPHYS SCI,CHICAGO,IL 60637, USA. OI Rowley, David/0000-0001-9767-9029 NR 32 TC 309 Z9 343 U1 8 U2 78 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD MAR PY 1992 VL 109 IS 1-2 BP 11 EP 23 DI 10.1016/0012-821X(92)90070-C PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HN989 UT WOS:A1992HN98900002 ER PT J AU GOLDSTEIN, SJ MURRELL, MT JANECKY, DR DELANEY, JR CLAGUE, DA AF GOLDSTEIN, SJ MURRELL, MT JANECKY, DR DELANEY, JR CLAGUE, DA TI GEOCHRONOLOGY AND PETROGENESIS OF MORB FROM THE JUAN-DE-FUCA AND GORDA RIDGES BY U-238 TH-230 DISEQUILIBRIUM SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article ID EAST PACIFIC RISE; SPREADING CENTERS; GABBROIC XENOLITHS; ND ISOTOPES; HALF-LIFE; BASALTS; SYSTEMATICS; SR; GEOCHEMISTRY; CONSTRAINTS AB A highly precise mass spectrometric method of analysis was used to determine U-238-U-234-Th-230-Th-232 in axial and off-axis basalt glasses from Juan de Fuca (JDF) and Gorda ridges. Inital Th-230 activity excesses in the axial samples range from 3 to 38%, but generally lie within a narrow range of 12 to 15%. Secondary alteration effects were evaluated using delta-U-234 and appear to be negligible; hence the Th-230 excesses are magmatic in origin. Direct dating of MORB was accomplished by measuring the decrease in excess Th-230 in off-axis samples. U-238-Th-230 ages progressively increase with distance from axis. Uncertainties in age range from 10 to 25 ka for U-Th ages of 50 to 200 ka. The full spreading rate based on U-Th ages for Endeavour segment of JDF is 5.9 +/- 1.2 cm/yr, with asymmetry in spreading between the Pacific (4.0 +/- 0.6 cm/yr) and JDF (1.9 +/- 0.6 cm/yr) plates. For northern Gorda ridge, the half spreading rate for the JDF plate is found to be 3.0 +/- 0.4 cm/yr. These rates are in agreement with paleomagnetic spreading rates and topographic constaints. This suggests that assumptions used to determine ages, including constancy of initial Th-230/Th-232 ratio over time, are generally valid for the areas studied. Samples located near the axis of spreading are typically younger than predicted by these spreading rates, which most likely reflects recent volcanism within a 1-3 km wide zone of crustal accretion. Initial Th-230/Th-232 ratios and Th-230 activity excesses were also used to examine the recent Th/U evolution and extent of melting of mantle sources beneath these ridges. A negative anomaly in Th-230/Th-232 for Axial seamount lavas provides the first geochemical evidence of a mantle plume source for Axial seamount and the Cobb-Eicklberg seamount chain and indicates recent depletion of other JDF segment sources. Large Th-230 activity excesses for lavas from northern Gorda ridge and Endeavour segment indicate formation from a lower degree of partial melting than other segments. An inverse correlation between Th-230 excess and Th-230/Th-232 for each ridge indicates that these lower degree melts formed from slightly less depleted sources than higher degree melts. Uniformity in Th-230 excess for other segments suggests similarity in processes of melt formation and mixing beneath most of the JDF-Gorda ridge area. The average initial Th-230/Th-232 activity ratio of 1.31 for the JDF-Gorda ridge area is in agreement with the predicted value of 1.32 from the Th-Sr isotope mantle array. C1 UNIV WASHINGTON,SCH OCEANOG,SEATTLE,WA 98195. US GEOL SURVEY,MENLO PK,CA 94025. RP GOLDSTEIN, SJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,GRP INC-7,LOS ALAMOS,NM 87545, USA. NR 42 TC 50 Z9 55 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD MAR PY 1992 VL 109 IS 1-2 BP 255 EP 272 DI 10.1016/0012-821X(92)90088-D PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HN989 UT WOS:A1992HN98900020 ER PT J AU MILLER, NL AF MILLER, NL TI STABILITY ANALYSIS OF TOXIC-SUBSTANCES WITHIN AQUATIC ECOSYSTEMS AND THEIR EFFECT ON AQUATIC POPULATIONS SO ECOLOGICAL MODELLING LA English DT Article AB A stability analysis is presented for toxic substances introduced to aquatic ecosystems and their intercompartmental relationships to aquatic populations. A specific toxin, vinyl chloride, was used in this study because an aquatic ecosystem model that includes vinyl chloride is available. The system and compartmental stability are dependent on the magnitudes and rates of transfer of vinyl chloride into, out of, and within each compartment. An 11 compartment model is presented and set up for the system eigenvalues. Compartments whose eigenvalues equal zero are the least stable because they accumulate vinyl chloride. Intercompartmental transports of vinyl chloride into and out of the filter-feeding fish compartment is incorporated into a logistic population model. This model is analyzed for growth stability as a function of vinyl chloride in the aquatic system. It is found that the population collapses when the vinyl chloride decay rate terms are greater than the growth rate term. These techniques apply to the analysis of any aquatic population where a toxic substance is present. RP MILLER, NL (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. RI Miller, Norman/E-6897-2010 NR 6 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD MAR PY 1992 VL 60 IS 2 BP 151 EP 165 DI 10.1016/0304-3800(92)90044-F PG 15 WC Ecology SC Environmental Sciences & Ecology GA HP839 UT WOS:A1992HP83900004 ER PT J AU ARICO, AS ALDERUCCI, V ANTONUCCI, V FERRARA, S RECUPERO, V GIORDANO, N KINOSHITA, K AF ARICO, AS ALDERUCCI, V ANTONUCCI, V FERRARA, S RECUPERO, V GIORDANO, N KINOSHITA, K TI AC IMPEDANCE SPECTROSCOPY OF POROUS GAS-DIFFUSION ELECTRODE IN SULFURIC-ACID SO ELECTROCHIMICA ACTA LA English DT Article DE IMPEDANCE; PLATINUM ELECTROCATALYST; GAS-DIFFUSION ELECTRODE; OXYGEN REDUCTION; REACTION MECHANISM ID OXYGEN REDUCTION; STABILITY CONDITIONS; PLATINUM PARTICLES; PLANE DISPLAYS; STEADY-STATE; LAYER AB The ac impedance response of a porous fuel cell electrode was investigated in 0.5 M H2SO4 to obtain information on the kinetics of oxygen reduction on platinum supported on carbon and the influence of electrode structure. Reaction parameters such as charge transfer resistance, Warburg impedance and double layer capacitance were evaluated by simple equivalent circuits to model the electrochemical response of the porous electrode. It was observed that oxygen reduction follows different reaction pathways depending on the applied electrode potential. In the activation controlled region of the polarization curve, adsorbed intermediates appear to be involved in the rate-determining step. C1 CNR,INST TRANSFORMAT & STORAGE ENERGY,VIA SALITA S LUCIA SOPRA CONTESSE 39,I-98126 PISTUNINA,ITALY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. OI Arico', Antonino Salvatore/0000-0001-8975-6215 NR 24 TC 31 Z9 31 U1 1 U2 5 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 MAR PY 1992 VL 37 IS 3 BP 523 EP 529 DI 10.1016/0013-4686(92)87045-2 PG 7 WC Electrochemistry SC Electrochemistry GA GY646 UT WOS:A1992GY64600022 ER PT J AU TAYLOR, J GIOMETTI, CS AF TAYLOR, J GIOMETTI, CS TI USE OF PRINCIPAL COMPONENTS-ANALYSIS FOR MUTATION DETECTION WITH 2-DIMENSIONAL ELECTROPHORESIS PROTEIN SEPARATIONS SO ELECTROPHORESIS LA English DT Article ID TWO-DIMENSIONAL ELECTROPHORESIS; EXPRESSION AB The application of two-dimensional electrophoresis (2-DE) to mutation detection requires the capability to monitor each protein in a 2-DE pattern for significant changes in abundance indicative of a mutation event. Previously, mutation searches were done using a univariate outlier detection method in which each protein spot was considered independently in a classical outlier search. An alternative approach to analysis of 2-DE patterns for quantitative changes is a multivariate procedure which takes advantage of the observation that protein spots in a 2-DE pattern often represent correlated rather than independent measurements. We have compared the efficiency of univariate and multivariate procedures for mutation detection using data from the Argonne National Laboratory 2-DE database of mouse liver proteins. Analyses involving a total of over 1500 gels were performed to compare the performance of a multivariate method based on principal components analysis (PCA) with the univariate method. Up to 279 spots from each pattern were used for PCA. First, a simulation was performed to assess the detection efficiency of PCA for single protein spots decreased in abundance by 50%. Then, the ability to detect actual mutations was tested using eight confirmed mutations. Results show that, compared to a univariate approach to analysis of data from the mouse model system, the multivariate method increases the number of protein spots on each 2-DE pattern that can be monitored for quantitative changes indicative of mutations by compensating for variables that contribute to the background quantitative variability of protein spots. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,BLDG 202,ROOM A121,9700 S CASS AVE,ARGONNE,IL 60439. NR 20 TC 19 Z9 19 U1 0 U2 2 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD MAR PY 1992 VL 13 IS 3 BP 162 EP 168 DI 10.1002/elps.1150130133 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA HQ640 UT WOS:A1992HQ64000010 PM 1592047 ER PT J AU LEDERER, H SCHATZ, O MAY, R CRESPI, H DARLIX, JL LEGRICE, SFJ HEUMANN, H AF LEDERER, H SCHATZ, O MAY, R CRESPI, H DARLIX, JL LEGRICE, SFJ HEUMANN, H TI DOMAIN-STRUCTURE OF THE HUMAN-IMMUNODEFICIENCY-VIRUS REVERSE-TRANSCRIPTASE SO EMBO JOURNAL LA English DT Article DE HIV-1; NEUTRON SCATTERING; RECONSTITUTION; REVERSE TRANSCRIPTASE; STRUCTURE ID SMALL-ANGLE SCATTERING; DEPENDENT RNA-POLYMERASE; ESCHERICHIA-COLI; HIV-1 REPLICATION; RIBONUCLEASE H; NEUTRON; ENDONUCLEASE; PROTEINS; DNA; EXPRESSION AB The spatial arrangement of subunits p51 and p66 of the HIV-1 reverse transcriptase and the position of the RNase H containing domain, p15, have been determined by means of neutron small-angle scattering. The reverse transcriptase (p66/p51) is a flat molecule, which can be approximated by an ellipsoid with the half axes of 5.2 nm, 4.8 nm and 1.4 nm. The two subunits p51 and p66 having a centre-to-centre distance of 3.3 +/- 0.3 nm are attached at their flat sides, slightly shifted sideways. The p15 domain is located at the long axis of the ellipsoidal reverse transcriptase having a distance of 5.0 +/- 0.5 nm to the centre of the p51d domain, which is part of the p66 subunit, and a distance of 5.3 +/- 1.2 nm to the centre of the neighbouring p51s subunit. C1 MAX PLANCK INST BIOCHEM,W-8033 MARTINSRIED,GERMANY. F HOFFMANN LA ROCHE & CO LTD,CENT RES UNIT,CH-4002 BASEL,SWITZERLAND. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. ARGONNE NATL LAB,ARGONNE,IL 60439. ECOLE NORM SUPER,BIOL LAB,F-69367 LYONS 07,FRANCE. CASE WESTERN RESERVE UNIV,SCH MED,DIV INFECT DIS,CLEVELAND,OH 44106. FU NIAID NIH HHS [R01 AI/GM 31147-01] NR 41 TC 21 Z9 21 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0261-4189 J9 EMBO J JI Embo J. PD MAR PY 1992 VL 11 IS 3 BP 1131 EP 1139 PG 9 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA HH082 UT WOS:A1992HH08200038 PM 1372248 ER PT J AU SCHIPPER, L HOWARTH, R CARLASSARE, E AF SCHIPPER, L HOWARTH, R CARLASSARE, E TI ENERGY INTENSITY, SECTORAL ACTIVITY, AND STRUCTURAL-CHANGE IN THE NORWEGIAN ECONOMY SO ENERGY LA English DT Article AB We analyze energy-use patterns since 1950 in the residential, service, manufacturing, and transportation sectors of the Norwegian economy, concentrating on changes in energy intensity, sectoral activity, and sectoral structure between 1973 and 1987. In most sectors, energy intensity has increased since the 1973 oil shock, even though the total energy-to-GDP ratio has decreased over the same period. Energy efficiency has not improved as much in Norway as in the other OECD countries. There are several reasons for this. First, electricity has been inexpensive and Norway is a net oil exporter. The income from oil development in Norway, in response to the oil shocks of the 1970s, resulted in energy-use increases while other nations responded by reducing energy utilization. A more subtle factor is that the use of energy in Norway is reaching maturity in most sectors as the ownership of principal energy-using equipment saturates. If changes in energy policy were put into place to increase the price of electricity in Norway, the energy efficiency of the economy could improve dramatically in the future. RP SCHIPPER, L (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. OI Howarth, Richard/0000-0003-3182-7345 NR 10 TC 14 Z9 14 U1 0 U2 2 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 MAR PY 1992 VL 17 IS 3 BP 215 EP 233 DI 10.1016/0360-5442(92)90050-A PG 19 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA HD402 UT WOS:A1992HD40200002 ER PT J AU SUTER, GW LOAR, JM AF SUTER, GW LOAR, JM TI WEIGHING THE ECOLOGICAL RISK OF HAZARDOUS-WASTE SITES SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID FISH RP SUTER, GW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 20 TC 20 Z9 20 U1 0 U2 1 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 MAR PY 1992 VL 26 IS 3 BP 432 EP 438 DI 10.1021/es00027a001 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HG158 UT WOS:A1992HG15800006 ER PT J AU NIMLOS, MR MILNE, TA AF NIMLOS, MR MILNE, TA TI DIRECT MASS-SPECTROMETRIC STUDIES OF THE DESTRUCTION OF HAZARDOUS WASTES .1. CATALYTIC STEAM RE-FORMING OF CHLORINATED HYDROCARBONS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID MOLECULAR CHARACTERIZATION; METHYL-CHLORIDE; PYROLYSIS; INCINERATION; BIOMASS AB Catalytic steam re-forming behavior was studied for a number of chlorinated and nonchlorinated organic species using the direct sampling capabilities of the molecular beam mass spectrometer (MBMS). Steam re-forming is an often used chemical process that can convert hydrocarbons into largely CO and H2. These screening studies investigated the possibility of using a catalytic steam re-forming environment to destroy hazardous waste by measuring destruction efficiencies and qualitatively comparing product slates with straight pyrolysis. For the steam re-forming, a rhodium catalyst on a reticulated alumina support was used and these observations were made. (1) Catalytic steam re-forming significantly enhanced the destruction of the compounds studied compared to destruction by pyrolysis. (2) Products of incomplete destruction are also significantly reduced, even for those species that are thermally stable. (3) Aromatics and acetonitrile are more difficult to steam re-form than aliphatic species. (4) A wide variety of species are susceptible to steam re-forming (including chlorine-containing species and acetonitrile) without any indication of catalyst deactivation over several 10-min periods. Two exceptions identified so far are the sulfur-containing species 3-methylthiophene and the phosphorus-containing species dimethyl methylphosphonate. Temperatures of the Rh catalyst must be maintained at 800-degrees-C or above to keep the catalyst active, at 50% steam in helium, for many compounds. RP NIMLOS, MR (reprint author), NATL RENEWABLE ENERGY LAB,CHEM CONVERS RES BRANCH,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 38 TC 12 Z9 12 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 MAR PY 1992 VL 26 IS 3 BP 545 EP 552 DI 10.1021/es00027a016 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HG158 UT WOS:A1992HG15800023 ER PT J AU MCDOWELLBOYER, LM AF MCDOWELLBOYER, LM TI CHEMICAL MOBILIZATION OF MICRON-SIZED PARTICLES IN SATURATED POROUS-MEDIA UNDER STEADY FLOW CONDITIONS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID BROWNIAN PARTICLES; FILTRATION; DEPOSITION; SURFACES; FORCES; SUSPENSIONS AB Many waterborne contaminants are particulate in nature or are associated with small particles or colloids. Thus, consideration of the mobility of colloids in porous media is necessary for an understanding of contaminant transport in groundwater. Immobilization of colloids in porous media has been studied extensively for water filtration applications, but the reverse process of mobilization is seldom considered. This study addresses the latter process. Theoretical treatment of the mobilization process in steady flow situations generally involves consideration of London-van der Waals attractive forces and electrical double-layer attractive or repulsive forces at the point of contact between media and particle surface. Laboratory sand columns were used to test the suitability of this approach with respect to observed mobilization under changing chemical conditions. Colloids deposited on the porous media surface were mobilized when exposed to lower ionic strength solution without disturbing the flow rate. Although results did not contradict theory qualitatively, further theoretical development is necessary to consider a broader range of surface forces likely to affect mobilization behavior. Flow rate dependence of mobilization is indicated and must be investigated further in order to understand its basis. RP MCDOWELLBOYER, LM (reprint author), OAK RIDGE NATL LAB,HLTH & SAFETY RES DIV,POLLUTANT ASSESSMENTS GRP,POB 2567,GRAND JCT,CO 81502, USA. NR 26 TC 103 Z9 107 U1 2 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAR PY 1992 VL 26 IS 3 BP 586 EP 593 DI 10.1021/es00027a023 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HG158 UT WOS:A1992HG15800030 ER PT J AU GUIDOTTI, CV MAZZOLI, C SASSI, FP BLENCOE, JG AF GUIDOTTI, CV MAZZOLI, C SASSI, FP BLENCOE, JG TI COMPOSITIONAL CONTROLS ON THE CELL DIMENSIONS OF 2M1 MUSCOVITE AND PARAGONITE SO EUROPEAN JOURNAL OF MINERALOGY LA English DT Article DE MUSCOVITE 2M1; PARAGONITE 2M1; CELL PARAMETERS; COMPOSITION ID AQUEOUS (NA,K)CL FLUID; K EXCHANGE-REACTION; CRYSTALLINE SOLUTIONS; EXPERIMENTAL REVERSAL; LOW-GRADE; MICAS; ROCKS AB Multivariant, second order regression equations have been developed to quantify the effects of Na* [= 100 Na/(Na + K)] and Fm [= (Fe(T) + Mg + Mn)] on the a, b, 1/2 c.sin beta, and V cell parameters of muscovite (143 specimens) and paragonite (22 specimens). Na* substitutions occur on the XII sites of these micas, and it is assumed that all Fm substitutions occur on the VI sites. The Na* substitution has a strong effect on 1/2 c.sin beta and V and only a small effect on a and b. Fm substitution is largely restricted to muscovite and causes the a and b dimensions to increase. However, the associated increase of the a and b dimensions of the octahedral sheet necessitates rotations in the associated tetrahedral sheet such that the 1/2 c.sin beta dimension decreases concomitantly. The net effect of Fm substitution on cell volume is thus only a small increase. Our regression equations for cell volume indicate that DELTA-V(mix) is positive for Na-bearing muscovites, but is either zero or slightly negative for K-bearing paragonites. A crystallochemical model is proposed to explain the latter behavior. These results may provide some insights on the effects of pressure on the solvus limbs, and a possible explanation of the low sodium-contents typical of phengitic muscovites, and the low phengite-contents typical of paragonites. These interrelations provide evidence which should enable formulation of better activity models for both paragonite and muscovite. Previous attempts to use the muscovite-paragonite solvus as a geothermometer have yielded only semi-quantitative estimates of final equilibration temperatures. Applying the results obtained in this report should make it possible to significantly improve the accuracy of these temperature estimates. C1 UNIV PADUA,DIPARTIMENTO MINERAL & PETROL,I-35100 PADUA,ITALY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP GUIDOTTI, CV (reprint author), UNIV MAINE,DEPT GEOL SCI,ORONO,ME 04469, USA. RI Mazzoli, Claudio/H-9651-2015 OI Mazzoli, Claudio/0000-0002-0374-8415 NR 39 TC 45 Z9 45 U1 0 U2 3 PU E SCHWEIZERBART'SCHE VERLAGS PI STUTTGART PA NAEGELE U OBERMILLER JOHANNESSTRASSE 3A, D 70176 STUTTGART, GERMANY SN 0935-1221 J9 EUR J MINERAL JI Eur. J. Mineral. PD MAR-APR PY 1992 VL 4 IS 2 BP 283 EP 297 PG 15 WC Mineralogy SC Mineralogy GA HM502 UT WOS:A1992HM50200006 ER PT J AU SMYTH, MJ WHARTON, W AF SMYTH, MJ WHARTON, W TI DIFFERENTIATION OF A31T6 PROADIPOCYTES TO ADIPOCYTES - A FLOW CYTOMETRIC ANALYSIS SO EXPERIMENTAL CELL RESEARCH LA English DT Article ID ADIPOSE CELL LINE; GROWTH ARREST; NILE RED; PREADIPOSE CELLS; 3T3 CELLS; G1 PHASE; CONVERSION; FIBROBLASTS; CULTURE; INSULIN RP SMYTH, MJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,CELLULAR & MOLEC BIOL GRP,LOS ALAMOS,NM 87545, USA. FU NCRR NIH HHS [P41-RR01315] NR 42 TC 36 Z9 37 U1 1 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0014-4827 J9 EXP CELL RES JI Exp. Cell Res. PD MAR PY 1992 VL 199 IS 1 BP 29 EP 38 DI 10.1016/0014-4827(92)90458-K PG 10 WC Oncology; Cell Biology SC Oncology; Cell Biology GA HE278 UT WOS:A1992HE27800004 PM 1735459 ER PT J AU DUNCAN, BW HARRISON, MR CROMBLEHOLME, TM CLEMONS, G TAVASSOLI, M ZANJANI, ED AF DUNCAN, BW HARRISON, MR CROMBLEHOLME, TM CLEMONS, G TAVASSOLI, M ZANJANI, ED TI EFFECT OF ERYTHROPOIETIC STRESS ON DONOR HEMATOPOIETIC-CELL EXPRESSION IN CHIMERIC RHESUS-MONKEYS TRANSPLANTED INUTERO SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE INUTERO TRANSPLANTATION; HEMATOPOIESIS; CHIMERISM ID BONE-MARROW TRANSPLANTATION AB We have previously reported the successful development of hematopoietic chimerism after the in utero transplantation of fetal hematopoietic stem cells (HSC) in rhesus monkeys (Macaca mulatta). These animals exhibit sustained engraftment without immunosuppression or graft-versus-host disease (GVHD). To assess the functional response of the donor-derived erythropoietic population, we assayed the relative expression of donor and recipient hematopoietic progenitors in chimeric monkeys before and after anemic stress. Anemia in our chimeric animals resulted in increased erythropoietin (EPO) production comparable to controls. This was accompanied by changes in erythroid progenitor profiles, again similar to controls. Chimeric animals demonstrated normal reticulocytosis and reconstituted their hematocrit after hemorrhage at the same rate as controls. The donor-derived erythropoietic population exhibited normal responses to recipient regulatory signals and did not seem to expand at the expense of other hematopoietic lineages. Thus the proportions of engraftment for the myeloid and erythroid precursors in bone marrow and for blood lymphocytes remained stable. Our results demonstrate that the in utero transplantation of fetal HSC results in stable engraftment of donor erythropoietic progenitors, which appear to be fully integrated within the recipient's regulatory system. The abnormalities reported in the postnatal transplantation setting can then be attributed to immunologic reactions requiring conditioning myeloablative regimens. Fetal transplantation bypasses all these factors. C1 DEPT VET AFFAIRS MED CTR,RENO,NV. DEPT VET AFFAIRS MED CTR,JACKSON,MS. UNIV CALIF SAN FRANCISCO,DEPT SURG,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL46556, HL39875, HL40722] NR 17 TC 3 Z9 3 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD MAR PY 1992 VL 20 IS 3 BP 350 EP 353 PG 4 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA HF746 UT WOS:A1992HF74600012 PM 1348981 ER PT J AU KOSKI, JA DEMPSEY, JF MCGRATH, RT AF KOSKI, JA DEMPSEY, JF MCGRATH, RT TI CONTOURING OF AN INERTIALLY COOLED PUMP LIMITER FOR TORE SUPRA SO FUSION ENGINEERING AND DESIGN LA English DT Article AB The paper describes the methods used to calculate, optimize and machine the surface contours of a pyrolytic graphite limiter head for the Tore Supra tokamak. The main objective of the effort was to produce an inertially cooled limiter head that would sustain at least a 5 s plasma pulse with 2 MW of total incident power while maximizing particle pumping. First, the paper discusses calculation and optimization of the contours, and describes the plasma edge model used in the analysis. Techniques and algorithms used for optimization are described, and the sequence leading to optimized limiter surface contours detailed. Techniques used to transfer the design from the computer-aided design model to programs for numerical control machining of the contours are then discussed. The use of computer aided analyses and contour transfer not only minimized the risk of error in the final contours, but also permitted consideration of more complex shapes. C1 EG&G SPECIAL PROJECTS INC,ALBUQUERQUE,NM 87185. RP KOSKI, JA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 19 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD MAR PY 1992 VL 15 IS 3 BP 263 EP 277 DI 10.1016/0920-3796(92)90045-6 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HP676 UT WOS:A1992HP67600007 ER PT J AU CRAWFORD, OH AF CRAWFORD, OH TI EXAMINATION OF A PROPOSED PHONON-COUPLING MECHANISM FOR COLD FUSION SO FUSION TECHNOLOGY LA English DT Note DE PHONON-COUPLING MECHANISM; PROTON-DEUTERON FUSION; THEORY AB The proposed nuclear energy in an atomic lattice (NEAL) mechanism for nuclear fusion in a cathode during electrolysis of D2O is examined. In this mechanism, coupled harmonic motion of deuterons is supposed to lead to a reduction in the width of the Coulomb barrier for proton-deuteron (p-d) fusion in palladium, thereby substantially increasing the fusion rate. Instead, it is argued that deuteron-deutron coupling does not have an important effect and that interaction with phonons does not enhance the p-d fusion rate. RP CRAWFORD, OH (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 161 EP 162 PN 1 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HD570 UT WOS:A1992HD57000006 ER PT J AU ANDERSON, JL AF ANDERSON, JL TI TRITIUM TECHNOLOGY PROGRAMS IN THE UNITED-STATES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID OPERATING EXPERIENCE; SYSTEMS AB Tritium technology in the United States has advanced considerably since the 1988 Tritium Conference in Toronto. This advance has come in facilities, processing, and safety related technologies and in an ever increasing commitment to compliance related issues. The major laboratories in the U. S. tritium programs continue to be (Westinghouse) Savannah River Site, EG&G Mound, Lawrence Livermore National Laboratory, Sandia National Laboratory and the Los Alamos National Laboratory. Each of these Laboratories have made some significant changes in their programs and/or facilities in the past four years. RP ANDERSON, JL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,TRITIUM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545, USA. NR 14 TC 4 Z9 4 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 226 EP 231 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700007 ER PT J AU MOTYKA, T AF MOTYKA, T TI THE REPLACEMENT TRITIUM FACILITY SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Tritium processing operations have been performed at the Savannah River Site (SRS) since 1955. During this time, tritium handling and processing operations have been continually improving. In 1987 construction began on a new tritium handling facility, the Replacement Tritium Facility. This new facility, which is scheduled for startup in 1992, makes use of the latest technology to enhance operational safety, ensure material safeguards and security, and avoid tritium losses to the environment. One of the new technologies incorporated into the Replacement Tritium Facility is the application of metal hydrides to store, separate, purify, pump, and compress hydrogen isotopes. This paper will provide an overview of the new Replacement Tritium Facility, and in addition will review the role and impact of metal hydride technology in present and future tritium processing operations at SRS. RP MOTYKA, T (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 5 TC 11 Z9 11 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 247 EP 252 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700010 ER PT J AU MORIMOTO, H WILLIAMS, PG AF MORIMOTO, H WILLIAMS, PG TI DESIGN AND OPERATIONS AT THE NATIONAL TRITIUM LABELING FACILITY SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The National Tritium Labelling Facility (NTLF) is a multipurpose facility engaged in tritium labelling research.1 It offers to the biomedical research community a fully equipped laboratory for the synthesis and analysis of tritium labelled compounds. The design of the tritiation system, its operations and some labelling techniques are presented. RP MORIMOTO, H (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,NATL TRITIUM LABELLING FACIL,BERKELEY,CA 94720, USA. NR 11 TC 11 Z9 11 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 256 EP 261 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700012 ER PT J AU BARNES, JW ANDERSON, JL BARTLIT, JR CARLSON, RV KONISHI, S INOUE, M NARUSE, Y AF BARNES, JW ANDERSON, JL BARTLIT, JR CARLSON, RV KONISHI, S INOUE, M NARUSE, Y TI EXPERIENCES WITH A JAPANESE-AMERICAN FUSION FUEL PROCESSING HARDWARE PROJECT SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The United States Department of Energy (USDOE) and the Japan Atomic Energy Research Institute (JAERI) have installed a full-scale fuel cleanup system (JFCU) for testing at Los Alamos. The JFCU was designed by JAERI and built by Mitsubishi Heavy Industries (MHI) in Kobe, Japan. Experience gained by Japanese working at Los Alamos facilitated development of a system consistent with Los Alamos operations and standards. US or equivalent Japanese standards were generally used for design resulting in minor problems at electrical interfaces. Frequent written interchanges were essential to project success, as spoken communications can be misunderstood. Differing work styles required detailed pre-planning, separation of responsibilities, and daily scheduling meetings. Safety and operational documentation drafted by JAERI personnel was revised at Los Alamos to assure conformance with USDOE and Los Alamos standards. The project was successful because both Japanese and American participants worked hard to overcome potential problems. These experiences will be valuable in conducting future international fusion projects. C1 JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. RP BARNES, JW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MAIL STOP C348,LOS ALAMOS,NM 87545, USA. NR 1 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 262 EP 265 PN 2 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700013 ER PT J AU MAIENSCHEIN, JL HUDSON, RS TSUGAWA, RT FEARON, EM SOUERS, PC COLLINS, GW AF MAIENSCHEIN, JL HUDSON, RS TSUGAWA, RT FEARON, EM SOUERS, PC COLLINS, GW TI PRODUCTION OF ULTRAPURE D-T GAS BY REMOVAL OF MOLECULAR TRITIUM BY SELECTIVE ADSORPTION SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Production of molecular deuterium-tritium (D-T) with very low molecular tritium (T2) is necessary for application as a nuclear spin polarized fuel. Selective adsorption of hydrogen isotopes on zeolites or alumina can provide the separation needed to produce D-T with very low T2. Use of an adsorption column at 20-25 K offers low inventory, compact size, and rapid operation, in comparison with conventional separation techniques such as cryogenic distillation or thermal diffusion. We discuss principles of adsorption, and describe a calculational model of the adsorption column and operational implications revealed by it. We show experimental proof-of-principle data for removal of T2 from D-T with an adsorption column operated at 23 K. RP MAIENSCHEIN, JL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 13 TC 0 Z9 0 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 269 EP 275 PN 2 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700014 ER PT J AU HOREN, AS LEE, MW AF HOREN, AS LEE, MW TI METAL HYDRIDE BASED ISOTOPE-SEPARATION - LARGE-SCALE OPERATIONS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB A program to develop a metal hydride based hydrogen isotope separation process began at the Savannah River Laboratory in 1980. This semi-continuous gas chromatographic separation process will be used in new tritium facilities at the Savannah River Site. A tritium production unit is scheduled to start operation in 1992. An experimental, large-scale unit is currently being tested using protium and deuterium. Operation of the large-scale unit has demonstrated separation of mixed hydrogen isotopes (55% protium and 45% deuterium), resulting in protium and deuterium product streams with purities better than 99.5%. RP HOREN, AS (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,POB 616,AIKEN,SC 29808, USA. NR 4 TC 29 Z9 31 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 282 EP 286 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700016 ER PT J AU INOUE, M KONISHI, S YAMANISHI, T OHIRA, S WATANABE, T OKUNO, K NARUSE, Y SHERMAN, RH BARNES, JW BARTLIT, JR ANDERSON, JL AF INOUE, M KONISHI, S YAMANISHI, T OHIRA, S WATANABE, T OKUNO, K NARUSE, Y SHERMAN, RH BARNES, JW BARTLIT, JR ANDERSON, JL TI ISOTOPE-SEPARATION SYSTEM EXPERIMENTS AT THE TSTA SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID DISTILLATION AB The recent results of the Isotope Separation System (ISS) operations at the Tritium Systems Test Assembly (TSTA) with 100 g of tritium indicate that the system generally satisfies design goals, while system stability problems remain to be solved. We configured the ISS system for the three column mode, which is one of the promising cascade configurations in a fusion fuel cycle, to eliminate such instability and operated it for six days. Fluctuations in flows and liquid levels were improved. Column separation characteristics obtained were satisfactory and agreed with the numerical analysis. The amount of discharged tritium was an acceptable effluent level. This means that the existing ISS system can be used as a three column system and possibly be applied to numerous fuel concepts. Presently, a new laser Raman spectroscopic gas analyzer has been installed at the ISS. This on-line system enables studies of the ISS dynamic behavior for further stability and performance data. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,TRITIUM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545. RP INOUE, M (reprint author), JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. NR 11 TC 2 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 293 EP 298 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700018 ER PT J AU PENG, CT SOUERS, PC AF PENG, CT SOUERS, PC TI AN EVALUATION OF DIFFERENT METHODS FOR TRITIUM LABELING SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Tritium incorporation by synthetic and non-synthetic methods shares the common mechanism of labeling, requiring the activation of tritium gas. Activation can be by catalysts, hot tungsten wire, microwave discharge, etc. and results in the formation of tritium atoms and ions. The tritium atoms and ions may form free or sorbed onto a surface to react with substrate yielding different isotopomers and by-products. A third mechanism of labeling is tunneling. Tunneling is significant at near absolute zero temperature with liquid and solid tritium and is also significant when high pressures of tritium gas are used for labeling. Other parameters relating to supports, catalysts, purity of tritium gas, chemical nature of substrates, can also affect labeling. Tritium NMR spectroscopy can determine the tritium distribution in a molecule to aid in interpreting the labeling mechanism. The non-synthetic methods have the potential of labeling complex molecules of biomedical interest that are inaccessible by synthetic methods. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551. RP PENG, CT (reprint author), UNIV CALIF SAN FRANCISCO,SCH PHARM,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143, USA. NR 29 TC 0 Z9 0 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 307 EP 311 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700020 ER PT J AU SALJOUGHIAN, M MORIMOTO, H WILLIAMS, PG AF SALJOUGHIAN, M MORIMOTO, H WILLIAMS, PG TI SYNTHESIS OF HIGH SPECIFIC ACTIVITY [1-H-3] - FARNESYL PYROPHOSPHATE SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID ISOPRENOID PYROPHOSPHATES; PENTALENENE BIOSYNTHESIS; ENZYMATIC CYCLIZATION AB The synthesis of tritiated farnesyl pyrophosphate with high specific activity is reported. E,E-Farnesol was oxidized to the corresponding aldehyde followed by reduction with lithium aluminium tritide (5% H-3) to give [1-H-3]-E,E-farnesol. The specific radioactivity of the alcohol was determined from its triphenylsilane derivative, prepared under very mild conditions. The tritiated alcohol was phosphorylated by initial conversion to an allylic halide, and subsequent treatment of the halide with tris(tetra-n-butyl) ammonium hydrogen pyrophosphate. The hydride procedure followed in this work has advantages over existing methods for the synthesis of tritiated farnesyl pyrophosphate, giving a much higher radiochemical yield and offering the possibility of achieving theoretical specific activity levels when fully tritiated LiAlT4 is employed. RP SALJOUGHIAN, M (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,NATL TRITIUM LABELLING FACIL,BERKELEY,CA 94720, USA. NR 10 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 318 EP 324 PN 2 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700022 ER PT J AU GILL, JT HAWKINS, DB RENSCHLER, CL AF GILL, JT HAWKINS, DB RENSCHLER, CL TI SOLID-STATE RADIOLUMINESCENT SOURCES USING TRITIUM-LOADED ZEOLITES, AND THEIR PROPOSED USE AS PROCESS MONITORS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Zeolite-based tritium lamps are a possible alternative to traditional tritium gas tube light sources. Rare earth luminescing centers may be ion-exchanged into zeolite matrices. Close proximity of tritium atoms to the rare earths can be provided by highly tritiated water sorbed within the pore structure of the zeolite aluminosilicate matrix. Zeolites are optically clear and radiation stable. Light outputs up to 2 W/cm2, with good stability, are shown here for tritiated water-loaded zeolites. Procedures for obtaining light sources are presented and results are discussed. The possible use of these luminescent materials as process monitors for the tritium content of zeolite absorption columns is also proposed. C1 UNIV ALASKA,FAIRBANKS,AK 99775. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP GILL, JT (reprint author), EG&G MOUND APPL TECHNOL,MIAMISBURG,OH 45343, USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 325 EP 329 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700023 ER PT J AU SIMPSON, JD HOFFER, JK FOREMAN, LR AF SIMPSON, JD HOFFER, JK FOREMAN, LR TI BETA-LAYERING OF SOLID DEUTERIUM-TRITIUM IN A SPHERICAL POLYCARBONATE SHELL SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID RADIOACTIVELY INDUCED SUBLIMATION; FUEL AB We have examined two of the variables that affect the beta-layering process in which nonuniform layers of solid deuterium-tritium (DT) are driven toward uniformity by beta-decay induced sublimation. For these experiments, a 9 mm diameter polycarbonate sphere was partially filled with a 50-50 mix of DT liquid, frozen, and then held at 17 K. We measured the equilibration time constant tau as functions of solid layer thickness, He-4 exchange gas pressure, and age. Solid layer thicknesses ranged from 200-mu-m to 650-mu-m, exchange gas pressures from 0 to 600 torr, and age from 0 to 104 days. Results show a significant final solid layer anisotropy with exchange gas pressures above 5 torr, and tau values that increased with age by 0.01 min/day for 200-mu-m-thick layers, and by 0.5 min/day for 650-mu-m-thick layers. The time constant is shown to be a weak function of exchange gas pressure. RP SIMPSON, JD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 6 TC 7 Z9 7 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 330 EP 333 PN 2 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700024 ER PT J AU FINN, PA WEBB, JP AF FINN, PA WEBB, JP TI MODIFICATION OF A SHIELDED CELL TO HANDLE TRITIUM SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Irradiated tritium targets may be handled in the Main Cell of the Hot Fuel Examination Facility (HFEF) to support transient safety tests for the New Production Reactor (NPR). To support this activity, the systems at HFEF were examined with the goal of minimizing tritium contamination of HFEF while achieving the requirements of the transient tests. Conceptual design descriptions are provided for required experimental systems and tritium recovery systems. C1 ARGONNE NATL LAB,IDAHO FALLS,ID 83403. RP FINN, PA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 371 EP 376 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700031 ER PT J AU FINN, PA AF FINN, PA TI SEALING SYSTEMS FOR A HEAVY-WATER REACTOR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB This article summarizes a review of the technology of seal systems for four categories - flanges, elastomers, valves, and pumps was done to develop a data base for the design of the coolant components for a Heavy Water Reactor (HWR). The data base was derived from operating experience and seal development work for reactors in the United States, Canada, and Europe. RP FINN, PA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 377 EP 382 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700032 ER PT J AU MAIENSCHEIN, JL GARCIA, F GARZA, RG KANNA, RL MAYHUGH, SR TAYLOR, DT AF MAIENSCHEIN, JL GARCIA, F GARZA, RG KANNA, RL MAYHUGH, SR TAYLOR, DT TI EXPERIENCES WITH DECONTAMINATING TRITIUM HANDLING APPARATUS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Tritium-handling apparatus has been decontaminated as part of the downsizing of the LLNL Tritium Facility. Two stainless-steel gloveboxes that had been used to process lithium deuteridetritide (LiDT) salt were decontaminated using the Portable Cleanup System so that they could be flushed with room air through the facility ventilation system. Further surface decontamination was performed by scrubbing the interior with paper towels and ethyl alcohol or Swish(TM). The surface contamination, as shown by swipe surveys, was reduced from 7 x 10(6) - 2 x 10(8) Bq/m2 (4 x 10(4) - 10(6) disintegrations per minute per square cm, or dpm/cm2) to 3 x 10(4) - 7 x 10(6) Bq/m2 (2 x 10(2) - 4 x 10(4) dpm/cm2). Details on the decontamination operation are provided. A series of metal (palladium and vanadium) hydride storage beds have been drained of tritium and flushed with deuterium, in order to remove as much tritium as possible. The bed draining and flushing procedure is described, and a calculational method is presented which allows estimation of the tritium remaining in a bed after it has been drained and flushed. Data on specific bed draining and flushing are given. RP MAIENSCHEIN, JL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 383 EP 388 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700033 ER PT J AU KLEIN, JE MALLORY, MK NOBILE, A AF KLEIN, JE MALLORY, MK NOBILE, A TI TRITIUM MEASUREMENT TECHNIQUE USING IN-BED CALORIMETRY SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB One of the new technologies that has been introduced to the Savannah River Site (SRS) is the production scale use of metal hydride technology to store, pump, and compress hydrogen isotopes. For tritium stored in metal hydride storage beds, a unique relationship does not exist between the amount of tritium in the bed and the pressure-volume-temperature properties of the hydride material. Determining the amount of tritium in a hydride bed after desorbing the contents of the bed to a tank and performing pressure, volume, temperature, and composition (PVTC) measurements is not practical due to long desorption/absorption times and the inability to remove tritium "heels" from the metal hydride materials under normal processing conditions. To eliminate the need to remove tritium from hydride storage beds for measurement purposes, an "in-bed" tritium calorimetric measurement technique has been developed. The steady-state temperature rise of a gas stream flowing through a jacketed metal hydride storage bed is measured and correlated with power input to electric heaters used to simulate the radiolytic power generated by the decay of tritium to He-3. Temperature rise results for prototype metal hydride storage beds and the effects of using different gases in the bed are shown. Linear regression results shows that for 95% confidence intervals, temperature rise measurements can be obtained in 14 hours and have an accuracy of +/- 1.6% of a tritium filled hydride storage bed. RP KLEIN, JE (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 4 TC 11 Z9 11 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 401 EP 405 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700036 ER PT J AU DUNN, DL AF DUNN, DL TI EFFLUENT TREATMENT FACILITY TRITIUM EMISSIONS MONITORING SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB An Environmental Protection Agency (EPA) approved sampling and analysis protocol was developed and executed to verify atmospheric emissions compliance for the new Savannah River Site (SRS) F/H are Effluent Treatment Facility. Sampling equipment was fabricated, installed, and tested at stack monitoring points for filtrable particulate radionuclides, radioactive iodine, and tritium. The only detectable anthropogenic radionuclides released from Effluent Treatment Facility stacks during monitoring were iodine-129 and tritium oxide. This paper only examines the collection and analysis of tritium oxide. RP DUNN, DL (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29808, 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 442 EP 445 PN 2 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700043 ER PT J AU HOFSTETTER, KJ WILSON, HT AF HOFSTETTER, KJ WILSON, HT TI AQUEOUS EFFLUENT TRITIUM MONITOR DEVELOPMENT SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The development of a low-level tritium monitor for aqueous effluents has explored several potential techniques. In one method, a water-immiscible liquid scintillation cocktail was ultrasonically mixed with an aqueous sample to form a water-cocktail dispersion for analysis by liquid scintillation spectrometry. The organic cocktail could then be reused after phase separation. Of the cocktails tested, a toluene-based cocktail showed the highest tritium detection efficiency (7%). In another technique, the sensitivity of various solid scintillators (plastic beads, crushed inorganic salts, etc.) to tritium in aqueous solutions was measured. The most efficient solid scintillator had a 2% tritium detection efficiency. In a third method, a large surface area detector was constructed from thin fibers of plastic scintillator. This detector had a 0.1% intrinsic tritium detection efficiency. While sensitivities of -25 kBq/L of tritium for a short count have been attained using several of these techniques, none can yet reach the environmental level of < 1 kBq/L in aqueous solutions. RP HOFSTETTER, KJ (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29808, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 446 EP 451 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700044 ER PT J AU SHERMAN, RH TAYLOR, DJ BARTLIT, JR ANDERSON, JL OHIRA, S NAKAMURA, H KONISHI, S OKUNO, K NARUSE, Y AF SHERMAN, RH TAYLOR, DJ BARTLIT, JR ANDERSON, JL OHIRA, S NAKAMURA, H KONISHI, S OKUNO, K NARUSE, Y TI RADIOCHEMICAL REACTION STUDIES OF TRITIUM MIXED GASES BY LASER RAMAN-SPECTROSCOPY AT TSTA SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB This paper reports the preliminary results of studies of the kinetics of the reactions of T2 with H-2, D2, and CH4. The gas phase reactions were studied using laser Raman spectroscopy for the real-time analysis of species concentration. A novel flow cell which has low volume (ca. 4 cm3) and minimizes dead volumes is described. First order rate constants are in the range 1.4 - 2.7 days for reaction with H-2 and D2, and 5 days for the reaction with CH4. C1 JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. RP SHERMAN, RH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,TRITIUM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545, USA. NR 8 TC 4 Z9 5 U1 1 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 457 EP 461 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700046 ER PT J AU OHIRA, S NAKAMURA, H KONISHI, S HAYASHI, T OKUNO, K NARUSE, Y SHERMAN, RH TAYLOR, DJ KING, MA BARTLIT, JR ANDERSON, JL AF OHIRA, S NAKAMURA, H KONISHI, S HAYASHI, T OKUNO, K NARUSE, Y SHERMAN, RH TAYLOR, DJ KING, MA BARTLIT, JR ANDERSON, JL TI ONLINE TRITIUM PROCESS GAS-ANALYSIS BY LASER RAMAN-SPECTROSCOPY AT TSTA SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID ISOTOPES; HYDROGEN AB Laser Raman spectroscopy has been applied to the on-line analysis of the operation of the cryogenic Isotope Separation System (ISS) at the Tritium Systems Test Assembly (TSTA). A flow-through cell was employed to permit near real-time observation of the dynamic response of the 3-column ISS. Accurate analysis of hydrogen isotopic mixtures may be made in less than 2 minutes. Full response to a change in the sampling point is achieved in approximately one minute. Response measurements are shown as well as static column profiles and dynamic response to induced parameter changes. Cross check of analysis was performed with radio-gas chromatography. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,TRITIUM SCI TECHNOL GRP,LOS ALAMOS,NM 87545. RP OHIRA, S (reprint author), JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. NR 11 TC 16 Z9 16 U1 2 U2 3 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 465 EP 470 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700048 ER PT J AU CADWALLADER, LC GAVETT, MAS QUINTANA, L AF CADWALLADER, LC GAVETT, MAS QUINTANA, L TI ESTIMATED FAILURE RATES FOR SOME SELECTED TRITIUM SYSTEM COMPONENTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Fusion facility safety and reliability/availability analyses require accurate component failure rate information to provide meaningful results. While fission reactor operating experience data may be adequate for some types of components, there are some data needs that are fusion-specific, such as tritium fueling and handling system information. This paper summarizes the results of a failure data analysis task on several components at Los Alamos National Laboratory's Tritium Systems Test Assembly (TSTA). We took the failure reports and component operating information from the TSTA Failure/Maintenance Data Base. Calculated failure rates are on the same order of magnitude as screening fusion failure rate data, although a few failure rates were slightly higher. These new data should be of interest to fusion safety analysts and tritium systems designers. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP CADWALLADER, LC (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. RI Cadwallader, Lee/F-6933-2014 NR 13 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 518 EP 522 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700057 ER PT J AU HEUNG, LK GIBSON, GW ORTMAN, MS AF HEUNG, LK GIBSON, GW ORTMAN, MS TI TRITIUM STRIPPING BY A CATALYTIC EXCHANGE STRIPPER SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID WATER DEUTERIUM-EXCHANGE; VIII NOBLE-METALS AB A catalytic exchange process for stripping elemental tritium from gas streams has been demonstrated. The process uses a catalyzed isotopic exchange reaction between tritium in the gas phase and protium or deuterium in the solid phase on alumina. The reaction is catalyzed by platinum deposited on the alumina. The process has been tested with both tritium and deuterium. Decontamination factors (ratio of inlet and outlet tritium concentrations) as high as 1,000 have been achieved, depending on inlet concentration. The test results and some demonstrated applications are presented. RP HEUNG, LK (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 588 EP 593 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700069 ER PT J AU HEUNG, LK OWEN, JH HSU, RH HASHINGER, RF WARD, DE BANDOLA, PE AF HEUNG, LK OWEN, JH HSU, RH HASHINGER, RF WARD, DE BANDOLA, PE TI TRITIUM CONFINEMENT IN A NEW TRITIUM PROCESSING FACILITY AT THE SAVANNAH RIVER SITE SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB A new tritium processing facility, named the Replacement Tritium Facility (RTF), is nearing completion and is being prepared for startup at the Savannah River Site (SRS). The RTF has the capability to load and unload tritium from gas containers and to recover, purify and separate hydrogen isotopes. A multilayered confinement system is designed to reduce tritium losses to the environment. This confinement system is expected to confine and recover any tritium that might escape the process equipment, and to maintain the tritium concentration in the nitrogen glovebox atmosphere to less than 10(-1)-mu-Ci/cc tritium during normal operation. RP HEUNG, LK (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 6 TC 4 Z9 4 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 594 EP 598 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700070 ER PT J AU HEDLEY, WH ADAMS, FS GIBBS, GE MING, DR MYERS, KJ WELLS, JE AF HEDLEY, WH ADAMS, FS GIBBS, GE MING, DR MYERS, KJ WELLS, JE TI A PROBABILISTIC RISK ASSESSMENT OF MOUNDS TRITIUM EMISSIONS REDUCTION FACILITY (TERF) SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB A probabilistic risk assessment was made on the TERF process in order to establish its expected degree of reliability and to locate places in the system which could be improved by revision of the equipment or the operating procedures. The equipment design of the TERF was evaluated using a fault tree study. The probability of human failures was then evaluated by adding their probabilistic effects to the fault tree and then reevaluating it. It was found that 1) the TERF system is expected to be very reliable, with an annual expected downtime of only 2.35 hours, 2) the expected downtime comes almost entirely from process equipment failure rather than human errors, and 3) that certain equipment changes could be made that increased the system reliability. These equipment changes included 1) making provision for blocking off certain automatic control valves with more reliable manual valves to facilitate their repair and 2) making the two sources of power to the TERF totally independent of each other. C1 UNIV DAYTON,DEPT CHEM ENGN,DAYTON,OH 45469. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP HEDLEY, WH (reprint author), EG&G MOUND APPL TECHNOL,MIAMISBURG,OH 45343, USA. NR 6 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 678 EP 682 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700083 ER PT J AU MAIENSCHEIN, JL WILSON, SW GARCIA, F AF MAIENSCHEIN, JL WILSON, SW GARCIA, F TI DESIGN AND OPERATIONAL EXPERIENCE WITH A PORTABLE TRITIUM CLEANUP SYSTEM SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB We built a portable tritium cleanup system to scavenge tritium from contaminated gases in any tritium-containing system in the LLNL Tritium Facility. The cleanup system uses standard catalytic oxidation of tritium to water followed by water removal with a molecular sieve dryer. The cleanup unit, complete with instrumentation, is contained in a portable cart that is rolled into place and connected to the apparatus to be cleaned. The cleanup system is effective, low-tech, simple, and reliable. The nominal flow rate of the system is 30 liters/minute, and the decontamination factor is > 1000. In this paper we will show design information on our portable cleanup system, and will discuss our operational experience with it over the past several years. RP MAIENSCHEIN, JL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 4 TC 2 Z9 3 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 691 EP 695 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700085 ER PT J AU AMANO, H GARTEN, CT AF AMANO, H GARTEN, CT TI SEASONAL TRENDS IN ENVIRONMENTAL TRITIUM CONCENTRATIONS IN A SMALL FOREST ADJACENT TO A RADIOACTIVE-WASTE STORAGE AREA SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID NUCLEAR-FACILITIES; WATER AB Tritium (HTO) concentrations were studied for an entire year in a floodplain forest adjacent to a low-level radioactive solid waste storage area (SWSA No.5) at Oak Ridge National Laboratory (ORNL) near Oak Ridge, Tennessee, USA. Tritium in soil was the principal source of HTO to the deciduous forest. Evaporation from the surface soil along with transpiration from tree leaves both contributed to HTO in the forest atmosphere. During the growing season, transpiration was the principal contributor of HTO to the forest atmosphere, while during the dormant season, the main source of atmospheric HTO was evaporation from the surface soil. Seasonal changes and the characteristics of vegetation will influence the relative importance of evaporation and transpiration as sources of atmospheric HTO near the ground in temperate deciduous forests. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP AMANO, H (reprint author), JAPAN ATOM ENERGY RES INST,DEPT ENVIRONM SAFETY RES,TOKAI,IBARAKI 31911,JAPAN. NR 9 TC 4 Z9 4 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 700 EP 705 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700087 ER PT J AU GILBERT, ER ALLEN, RP BALDWIN, DL BELL, RD BRIMHALL, JL CLEMMER, RG MARSCHMAN, SC MCKINNON, MA PAGE, RE POWERS, HG CHALK, SG AF GILBERT, ER ALLEN, RP BALDWIN, DL BELL, RD BRIMHALL, JL CLEMMER, RG MARSCHMAN, SC MCKINNON, MA PAGE, RE POWERS, HG CHALK, SG TI TRITIUM PERMEATION AND RELATED STUDIES ON BARRIER TREATED 316 STAINLESS-STEEL SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB To verify the performance of permeation-resistant cladding for tritium targets designed for a New Production Reactor Light-Water Reactor, a tritium test facility was designed, developed, fabricated, and certified. Testing is ongoing to verify the performance of reference-designed targets. Accurate measurements were taken of tritium permeating from barrier-coated cladding specimens immersed in high-temperature autoclaves configured to simulate reactor coolant conditions. The tritium test pressure is controlled by heating a zirconium-alloy getter, previously charged with tritium, to a temperature that corresponds to a specified test pressure. The apparatus for testing deuterium permeation was developed to calibrate nondestructive testing procedures for evaluating barrier quality and to screen defective industrial cladding. These permeation testing facilities perform parametric tests to evaluate the sensitivity of permeation to temperature, time, pressure, fabrication variables, barrier disparities, corrosion, and other factors. The experimental activities characterize the performance and material properties of target rod components as well as validate new nondestructive examination methods that measure target rod quality. The target rod components are 1) barrier-coated stainless steel cladding, 2) lithium aluminate pellets, 3) nickel-plated Zircaloy-4 getters, and 4) zirconium liners. In addition, data generated from statistical testing provide increased confidence in current analytical models that predict target rod performance during both steady state and calculated transient conditions. The test results indicate that the tritium release from a full core of NPR-LWR targets will satisfy design requirements for release of no more than 20,000 Ci of tritium to the reactor coolant, even with four failed target rods that release up to 50% of their inventory. C1 US DOE, WASHINGTON, DC USA. RP GILBERT, ER (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Marschman, Steven/E-5193-2017 OI Marschman, Steven/0000-0002-3335-4695 NR 2 TC 7 Z9 8 U1 0 U2 7 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 739 EP 744 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700094 ER PT J AU ANDERL, RA HOLLAND, DF LONGHURST, GR PAWELKO, RJ TRYBUS, CL SELLERS, CH AF ANDERL, RA HOLLAND, DF LONGHURST, GR PAWELKO, RJ TRYBUS, CL SELLERS, CH TI DEUTERIUM TRANSPORT AND TRAPPING IN POLYCRYSTALLINE TUNGSTEN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID HYDROGEN; HE AB Deuterium permeation studies for polycrystalline tungsten foil have been conducted to provide data for estimating tritium transport and trapping in tungsten-clad divertors proposed for advanced fusion-reactor concepts. Based on a detailed transmission electron microscopy (TEM) microstructural characterization of the specimen material and on analyses of permeation data measured at temperatures ranging from 610 to 823 K for unannealed and annealed tungsten foil (25-mu-m thick), we note the following key results: (1) deuterium transport in tungsten foil is dominated by extensive trapping that varies inversely with prior anneal temperatures of the foil material, (2) the reduction in the trapped fraction correlates with a corresponding elimination of a high density of dislocations in cell-wall structures introduced during the foil fabrication process, (3) trapping behavior in these foils can be modelled using trap energies between 1.3 eV and 1.5 eV and trap densities ranging from 1 x 10(-5) to 7 x 10(-5) atom fraction. RP ANDERL, RA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 14 TC 97 Z9 97 U1 4 U2 14 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 745 EP 752 PN 2 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700095 ER PT J AU NOBILE, A WERMER, JR WALTERS, RT AF NOBILE, A WERMER, JR WALTERS, RT TI AGING EFFECTS IN PALLADIUM AND LANI4.25AL0.75 TRITIDES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID HELIUM AB Palladium and LaNi5-xAlx (x = 0.30, 0.75, 0.85), which form reversible hydrides, are used for tritium processing and storage in the Savannah River Site (SRS) tritium facilities. As part of a program to develop technology based on the use of reversible metal hydrides for tritium processing and storage, the effects of aging on the thermodynamic behavior of palladium and LaNi4.25Al0.75 tritides are under investigation. During aging, the He-3 tritium decay product remains in the tritide lattice and changes the thermodynamics of the tritium-metal tritide system. Aging effects in 755-day-aged palladium and 1423-day-aged LaNi4.25Al0.75 tritides will be reported. Changes in the thermodynamics were determined by measuring tritium desorption isotherms on aging samples. In palladium, aging decreases the desorption isotherm plateau pressure and changes the alpha-phase portion of the isotherm. Aging-induced changes in desorption isotherms are more drastic in LaNi4.25Al0.75. Among the changes noted are: (1) decreased isotherm plateau pressure, (2) increased isotherm plateau slope, and (3) appearance of deeptrapped tritium, removable only by exchange with protium or deuterium. Various processes occurring in the tritide lattice which might be responsible for the observed aging effects in palladium and LaNi4.25Al0.75 tritides will be discussed. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP NOBILE, A (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,AIKEN,SC 29808, USA. NR 13 TC 16 Z9 26 U1 2 U2 4 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 769 EP 774 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700099 ER PT J AU FISHER, PW AF FISHER, PW TI PROPERTIES OF TRITIUM INFERRED FROM PELLET INJECTOR EXPERIMENTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The tritium proof-of-principle (TPOP) experiment was designed and built by Oak Ridge National Laboratory (ORNL) to demonstrate the formation and acceleration of the world's first tritium pellets for fueling of future fusion reactors. Many parameters measured during the course of the experiment have been used to evaluate the physical properties of solid tritium. Pellet size was measured as a function of equilibrium fill pressure. A model was developed to predict this information from values of thermal conductivity, vapor pressure, and density reported in the literature. Good agreement between theory and experiment was found for both deuterium and tritium pellets. Evaluation of breakaway pressure data for deuterium pellets indicates that the shear strength of deuterium is about equal to its ultimate tensile strength. Tritium shear strength appears to be about twice that of deuterium at temperatures around 8 K. The reduction in pellet diameter due to barrel erosion for deuterium was about twice that for tritium pellets at a given velocity. This was also indicative of the greater strength of tritium relative to deuterium. RP FISHER, PW (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 794 EP 799 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700103 ER PT J AU MIYAKE, H MATSUYAMA, M WATANABE, K COWGILL, DF AF MIYAKE, H MATSUYAMA, M WATANABE, K COWGILL, DF TI SIMPLE SYSTEM FOR MEASURING TRITIUM AD ABSORPTION USING A 2-PI COUNTER AND THERMAL-DESORPTION SPECTROMETER SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB We developed a simple system using tritium tracer and thermal desorption techniques to measure the tritium adsorption and/or absorption on/in a material having typical surface conditions: namely, not cleaned surface. The tritium counting devices used were a 2-pi counter and conventional proportional counter. With this system, the amounts of ad/absorption could be measured without exposing the samples to air after exposing them to tritium gas. The overall efficiency (F) of the 2-pi counter was described as F = exp(-2.64h), where h is the distance from the sample to the detector. Ad/absorption measurements were carried out for several materials used for fabricating conventional vacuum systems. The results were, in the order of decreasing amounts of ad/absorption, as [fiber reinforced plastics(FRP)] > [nickel(Ni), molybdenum disulfide(MoS2)] > [stainless steel (SS304), iron(Fe), aluminum alloy(A2219)] > [boron nitride(h-BN), silicon carbide(SiC), SS304 passivated by anodic oxidation layers(ASS) and that by boron nitride segregation layers(BSS)]. The relative amounts were about 100 for Ni and 0.1 for ASS and BSS, being normalized to Fe = 1. It was found that the passivation of SS304 with anodic oxidation layers and/or BN segregation layers should be quite valid to decresase the tritium inventory on/in the material walls of tritium handling systems. In addition, it was estimated that this system would be capable of detecting the tritium adsorption of the order of 10(-6) in the surface coverage. C1 SANDIA NATL LABS,TRITIUM RES LAB,LIVERMORE,CA 94550. RP MIYAKE, H (reprint author), TOYAMA UNIV,HYDROGEN ISOTOPE RES CTR,GOFUKU 3190,TOYAMA 930,JAPAN. NR 13 TC 0 Z9 0 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 812 EP 817 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700106 ER PT J AU ROBINSON, SL YANG, NYC AF ROBINSON, SL YANG, NYC TI THE ORIGINS OF TRITIUM AND HELIUM EFFECTS ON THE TENSILE PROPERTIES OF METALS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB ID STAINLESS-STEEL; HYDROGEN AB The effects of internal tritium and helium on the tensile properties of two austenitic stainless steels and an iron-based superalloy have been studied. The materials tested were, forged 21Cr-6Ni-9Mn and 304L (tested in the annealed condition and two forged conditions), and a modified A-286 alloy. The accumulation of He-3 from the radioactive decay of tritium caused an increase in the yield strength and a continuous decrease in the ductility in almost all materials tested. Increased He-3 concentrations also caused a change in fracture mode from ductile rupture to predominantly intergranular fracture. The property changes resulted from He-3 bubble-induced strengthening, which produced a change in deformation mode from long-range dislocation activity to deformation twinning. In the deformation-twinning mode, the He-3-accelerated fracture initiated at the intersections of deformation twins with grain boundaries. High-strength forged 304L was most resistant to He-3 effects, owing to the redistribution of He-3 on dislocations. C1 SANDIA NATL LABS,DIV 8314,LIVERMORE,CA 94551. RP ROBINSON, SL (reprint author), SANDIA NATL LABS,DIV 8312,LIVERMORE,CA 94551, USA. NR 10 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 856 EP 860 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700114 ER PT J AU SWANSIGER, WA AF SWANSIGER, WA TI TRITIUM, DEUTERIUM, AND HELIUM PERMEATION THROUGH EPDM O-RINGS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Tritium permeabilities were determined at room temperature, 1.0 MPa (150 psia) tritium for three 23.4 cm diameter EPDM (ethylene-propylene-diene monomer) O-rings using a full-scale mock-up of the AL-SX shipping container seal geometry. The AL-SX container is being developed by Sandia National Laboratories for shipping tritium reservoirs. To determine the tritium permeation rate as a function of temperature, a 50.8 mm diameter EPDM O-ring was tested from room temperature to 150-degrees-C at a pressure of 1.0 MPa. Additional permeation measurements were made under the following test conditions: (1) deuterium and helium-4 at room temperature and a pressure of 1.0 MPa using the full-scale AL-SX fixture, (2) tritium from 0.1 MPa to 1.0 MPa at 142-degrees-C using the 50.8 mm fixture, and (3) deuterium from room temperature to 150-degrees-C at a pressure of 1.0 MPa using the 50.8 mm fixture. Multiple permeation runs using the three full-scale O-rings showed the average room temperature, 1.0 MPa steady state tritium permeation rate to be about 1 x 10(-2) Pa-liter/sec (7.6 x 10(-5) torr-liter/sec or 1 x 10(-4) std cc/sec), well within the allowable limit of 7.1 x 10(-2) Pa-liter/sec for tritium release from the AL-SX container. Based on the temperature dependence derived from tests on the 50.8 mm fixture, the permeation rate through the large O-ring at 1.0 MPa tritium, 150-degrees-C would be about 60% of the allowable limit. The tritium permeability was found to vary linearly with pressure within the range explored. RP SWANSIGER, WA (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 7 TC 2 Z9 2 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 861 EP 866 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700115 ER PT J AU WALTHERS, CR JENKINS, EM NARUSE, Y MAYAUX, C OBERT, W AF WALTHERS, CR JENKINS, EM NARUSE, Y MAYAUX, C OBERT, W TI TRITIUM RETENTION IN JET CRYOPANEL SAMPLES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The possibility that tritium might exchange with water trapped in aluminum anodize cryopanels in JET prompted a test program at the Tritium Systems Test Assembly, TSTA, Los Alamos, New Mexico. JET furnished two test pieces of cryopanel which were exposed to tritium at approximately liquid nitrogen temperature and 25 torr pressure for nearly two weeks. One specimen was removed and the retained tritium was measured. The second specimen was subjected to several increasing temperature vacuum bakeouts and the effectiveness of the bakeouts were inferred from the pressure history of the chamber. When the retained tritium in the second specimen was measured, it was found that nearly 95% of the tritium, as measured in the first specimen, had been removed during the vacuum bakeouts. If the tritium retained in the cryopanel without bakeout were scaled to JET conditions according to a linear pressure-time relationship, the tritium expected to become trapped in the JET cryopanels would be approximately 0.6 gram. Testing is currently underway at TSTA which will determine the tritium retention to be expected under more realistic JET operating conditions and which will assess the effectiveness of various bake or purge schemes in removing the trapped tritium. C1 JET JOINT UNDERTAKING,OXFORD,ENGLAND. JAPAN ATOM ENERGY RES INST,DEPT THERMONUCL FUS RES,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. RP WALTHERS, CR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,TRITIUM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545, USA. NR 2 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 883 EP 885 PN 2 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700119 ER PT J AU BRERETON, SJ AF BRERETON, SJ TI DEVELOPMENT OF A FUSION FUEL-CYCLE SYSTEMS CODE SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The tritium inventory in a D-T fusion experiment, like ITER, may be the major hazard onsite. This tritium is distributed throughout various systems and components. A major thrust of safety work has been aimed at reducing these tritium inventories, or at least at minimizing the amount of tritium that could be mobilized. I have developed models for a time-dependent fuel cycle systems code, which will aid in directing designers towards safer, lower inventory designs. The code will provide a self-consistent picture of system interactions and system interdependencies, and provide a better understanding of how tritium inventories are influenced. A "systems" approach is valuable in that a wide range of parameters can be studied, and more promising regions of parameter space can be identified. Ultimately, designers can use this information to specify a machine with minimum tritium inventory, given various constraints. Here, I discuss the models that describe tritium inventory in various components as a function of system parameters, and the unique capabilities of a code that will implement them. The models are time dependent and reflect a level of detail consistent with a systems type of analysis. The models support both a stand-alone Tritium Systems Code, and a module for the SUPERCODE, a time-dependent tokamak systems code. Through both versions, we should gain a better understanding of the interactions among the various components of the fuel cycle systems. RP BRERETON, SJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L644,POB 5511,LIVERMORE,CA 94550, USA. NR 20 TC 2 Z9 2 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 926 EP 931 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700127 ER PT J AU YAMANISHI, T OKUNO, K ENOEDA, M AMANO, J HAYASHI, T NARUSE, Y SHERMAN, RH AF YAMANISHI, T OKUNO, K ENOEDA, M AMANO, J HAYASHI, T NARUSE, Y SHERMAN, RH TI EXPERIMENTAL-STUDY FOR DYNAMIC BEHAVIOR OF CRYOGENIC DISTILLATION-COLUMNS SEPARATING H-D-T SYSTEM SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB Dynamic behavior of cryogenic distillation columns has been studied with an H-D-T system (1.5 g of tritium) under single column and two-column cascade operation modes. The columns used were different in inner diameters (1 cm and 2 cm) and in size packings (3 mm Dixon rings for the larger column and 1.5 mm Dixon rings for the smaller column). For both of the columns, the experimental observations for composition distribution at the steady-state was in close agreement with calculated results for all the components. The HETP values measured were in the range from 3 to 6 cm. The dynamic variations of compositions in bottom product streams experimentally observed were well predicted by computer-aided simulation. For top product streams, the variations were significantly slow in comparison with those of the calculated results using an assumption that liquid holdups in condensers were negligible. These results indicate that the columns have appreciable liquid holdups at the condensers. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP YAMANISHI, T (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 7 TC 3 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 948 EP 953 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700131 ER PT J AU SZE, DK SAWAN, M HERRING, S AF SZE, DK SAWAN, M HERRING, S TI TRITIUM PRODUCTION, MANAGEMENT AND ITS IMPACT ON SAFETY FOR A D-3HE FUSION-REACTOR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB About three percent of the fusion energy produced by a D-He-3 reactor is in the form of neutrons. Those neutrons are generated by D-D and D-T reactions, with the tritium produced by the D-D fusion. The neutrons will react with structural steel, deuterium, He-3 and shielding material to produce tritium. About half of the tritium generated by the D-D reaction will not burn in the plasma and will exit as a part of the plasma exhaust. Thus, there is enough tritium produced in a D-He-3 reactor and careful management will be required. The tritium produced in the shield and plasma can be managed with an acceptable effect on cost and safety. C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV WISCONSIN,MADISON,WI 53706. RP SZE, DK (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 994 EP 998 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700139 ER PT J AU KONISHI, S HAYASHI, T INOUE, M OKUNO, K NARUSE, Y SATO, H FUKUI, H NEMOTO, K KUROKAWA, M BARNES, JW ANDERSON, JL AF KONISHI, S HAYASHI, T INOUE, M OKUNO, K NARUSE, Y SATO, H FUKUI, H NEMOTO, K KUROKAWA, M BARNES, JW ANDERSON, JL TI FABRICATION AND INSTALLATION OF THE JAERI FUEL CLEANUP SYSTEM SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB The Japan Atomic Energy Research Institute (JAERI) has developed a full scale Fuel Cleanup System (JFCU) that processes a simulated plasma exhaust at the Tritium Systems Test Assembly (TSTA) in the Los Alamos National Laboratory (LANL). The JFCU was designed by the Tritium Process Laboratory (TPL) of the JAERI based on the component studies performed under previous TSTA-TPL collaboration and the pilot scale experiment using grams of tritium at the TPL. The JFCU accepts a simulated fusion reactor exhaust, a mixture of hydrogen isotopes with an impurity level of up to 15% at a throughput of 4.2 x 10(-3) mol/s continuously and produces pure hydrogen isotopes while exhausting tritium-free waste gas. Some newly developed components, such as the Ceramic Electrolysis Cell and the large Zirconium-Cobalt bed, required special attention during fabrication and assembly. The apparatus was fabricated by Mitsubishi Heavy Industries (MHI) and installed at the TSTA in early 1990. Interfacing with the existing TSTA facility also required careful interaction between TSTA and JAERI. C1 MITSUBISHI HEAVY IND CO LTD,HYOGO KU,KOBE 652,JAPAN. UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,TRITIUM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545. RP KONISHI, S (reprint author), JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 999 EP 1004 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700140 ER PT J AU MCKILLIP, ST BANNISTER, CE CLARK, EA AF MCKILLIP, ST BANNISTER, CE CLARK, EA TI STRESS-ANALYSIS OF HYDRIDE BED VESSELS USED FOR TRITIUM STORAGE SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB A prototype hydride storage bed was fitted with strain gages to measure strains occurring in the stainless steel bed vessel caused by expansion of the storage powder upon uptake of hydrogen. The strain remained low in the bed as hydrogen was added, up to a bed loading of about 0.5 hydrogen to metal atom ratio. The strain then increased with increasing hydrogen loading, up to the maximum loading ratio of approximately 0.8. Different locations exhibited greatly differnet levels of maximum strain, suggesting that the powder does not flow as a fluid would be equalized the pressure. In no case was the design stress of the vessel exceeded. RP MCKILLIP, ST (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,BLDG 773-A,POB 616,AIKEN,SC 29802, USA. NR 2 TC 16 Z9 16 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 1011 EP 1016 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700142 ER PT J AU LONGHURST, GR HEICS, AG SHMAYDA, WT ROSSMASSLER, RL AF LONGHURST, GR HEICS, AG SHMAYDA, WT ROSSMASSLER, RL TI EXPERIMENTAL EVALUATION OF THE CONSEQUENCES OF URANIUM BED AIR-INGRESS ACCIDENTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS CY SEP 29-OCT 04, 1991 CL ALBUQUERQUE, NM SP LOS ALAMOS NATL LAB AB To help resolve unknowns regarding consequences of air-ingress accidents in uranium beds, a series of experiments was conducted at Ontario Hydro Research Division with the participation of Princeton Plasma Physics Laboratory and the Idaho National Engineering Laboratory. These experiments involved exposure of uranium beds of various sizes to air, oxygen in helium, argon and Nitrogen. Beds of 5-gram to 3-kg uranium capacity were tested. Starting temperatures ranged from 294 K to 824 K. Results of these experiments showed that in every test the reaction was restrained with modest temperature excursions. Either surface films or gas blanketing may be responsible for quenching the reaction with air. In these tests the reaction appears to be stopped by a diffusive barrier film of reaction products that grows on the surface of the uranium grains. The only tritium emissions appeared to be due to thermal oscillation-driven gas expansion. Our conclusion is that the hazard associated with an air-ingress accident involving a uranium bed is smaller than we thought initially. With proper bed design, the energy release will be modest and should not result in damage to the bed structure. Tritium release can be minimized or prevented by keeping the bed only partially loaded. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. ONTARIO HYDRO,DIV RES,TORONTO M8Z 5S4,ONTARIO,CANADA. RP LONGHURST, GR (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID, USA. NR 8 TC 6 Z9 7 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP 1017 EP 1023 PN 2 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700143 ER PT J AU ANDERSON, J BARTLIT, J AF ANDERSON, J BARTLIT, J TI 4TH NATIONAL TOPICAL MEETING ON TRITIUM TECHNOLOGY IN FISSION, FUSION, AND ISOTOPIC APPLICATIONS - PREFACE SO FUSION TECHNOLOGY LA English DT Editorial Material RP ANDERSON, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1992 VL 21 IS 2 BP R13 EP R13 PN 2 PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HM357 UT WOS:A1992HM35700002 ER PT J AU PETERSON, SR DVIR, A ANDERSON, CW DYNAN, WS AF PETERSON, SR DVIR, A ANDERSON, CW DYNAN, WS TI DNA-BINDING PROVIDES A SIGNAL FOR PHOSPHORYLATION OF THE RNA POLYMERASE-II HEPTAPEPTIDE REPEATS SO GENES & DEVELOPMENT LA English DT Article DE RNA POLYMERASE-II; PHOSPHORYLATION; DNA-DEPENDENT PROTEIN KINASE; HEPTAPEPTIDE REPEATS; TRANSCRIPTION ID ACTIVATED PROTEIN-KINASE; CARBOXYL-TERMINAL DOMAIN; HEAT-SHOCK PROTEIN; LARGEST SUBUNIT; TRANSCRIPTION INITIATION; SACCHAROMYCES-CEREVISIAE; WHEAT-GERM; INVITRO; COMPLEXES; PROMOTER AB Isolated transcription complexes contain a protein kinase that phosphorylates the heptapeptide repeats of the carboxy-terminal domain (CTD) of the RNA polymerase II (RNAP II) large subunit in an apparently promoter-dependent manner. We now show that the essential features of this reaction can be reproduced in a reconstituted system containing three macromolecular components: a fusion protein consisting of the CTD of RNAP II fused to a heterologous DNA-binding domain, an activating DNA fragment containing the recognition sequence for the fusion protein, and a protein kinase that binds nonspecifically to DNA. This kinase closely resembles a previously known DNA-dependent protein kinase. Evidently, the association of the CTD with DNA provides a key signal for phosphorylation. There appears to be no absolute requirement for specific contacts with other DNA-bound transcription factors. C1 UNIV COLORADO, DEPT CHEM & BIOCHEM, BOULDER, CO 80309 USA. BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. FU NIGMS NIH HHS [GM 35866] NR 55 TC 132 Z9 134 U1 0 U2 0 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 MAR PY 1992 VL 6 IS 3 BP 426 EP 438 DI 10.1101/gad.6.3.426 PG 13 WC Cell Biology; Developmental Biology; Genetics & Heredity SC Cell Biology; Developmental Biology; Genetics & Heredity GA HM444 UT WOS:A1992HM44400009 PM 1547941 ER PT J AU WESOLOWSKI, DJ AF WESOLOWSKI, DJ TI ALUMINUM SPECIATION AND EQUILIBRIA IN AQUEOUS-SOLUTION .1. THE SOLUBILITY OF GIBBSITE IN THE SYSTEM NA-K-CL-OH-AL(OH)4 FROM 0-DEGREES TO 100-DEGREES-C SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID MOLAR HEAT-CAPACITY; CONCENTRATED ELECTROLYTE MIXTURES; ACID ASSOCIATION QUOTIENTS; MINERAL SOLUBILITIES; THERMODYNAMIC PROPERTIES; OSMOTIC COEFFICIENTS; HYDROXIDE SOLUBILITY; RELATIVE ENTHALPY; HIGH-TEMPERATURES; NATURAL-WATERS AB The solubility of gibbsite, Al(OH)3, has been measured in a large number of solutions in the system Na-K-Cl-OH-Al(OH)4 from 6.4 to 80-degrees-C and 0.01 to 5.0 molal ionic strength. These results have been coupled with selected literature data and modeled using the Pitzer ion interaction treatment. An eight-parameter expression is derived for the molal concentration quotient of the reaction Al(OH)4- reversible Al(OH)3 + OH- in this system from which the equilibrium constant at infinite dilution, log K4, and the stoichiometric molal activity coefficient ratio, log (gamma-OH-/gamma-Al(OH)4-), can be evaluated over the range 0-100-degrees-C and 0-12 molal ionic strength at 1 bar with a precision of approximately +/- 0.02 log units. Standard thermodynamic properties of the reaction at 25-degrees-C and 1 bar are log K4 = 1.143 +/- 0.006, DELTA-H-degrees = -22.5 +/- 0.3 kJ/mol, DELTA-S-degrees = -54 +/- 1 J/K/mol, and DELTA-C(p)0 = -148 +/- 6 J/K/mol. From these quantities and the standard thermodynamic properties of gibbsite, the values of DELTA-G(f)0, DELTA-H(f)0, and S0 of [Al(OH)4-](aq) at 25-degrees-C and 1 bar are computed to be -1305.6 +/- 1.2 kJ/mol, -1500.6 +/- 1.5 kJ/mol, and 111.4 J/K/mol, respectively. Approximate values of the pure electrolyte parameters beta(0), beta(1), and C(phi) for NaAl(OH)4 and KAl(OH)4 as well as the mixing parameters for aluminate ion with OH-, OH- + Na+, and OH- + K+ are also obtained. RP WESOLOWSKI, DJ (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 53 TC 106 Z9 110 U1 3 U2 17 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 MAR PY 1992 VL 56 IS 3 BP 1065 EP 1091 DI 10.1016/0016-7037(92)90047-M PG 27 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HJ963 UT WOS:A1992HJ96300016 ER PT J AU PALMER, DA WESOLOWSKI, DJ AF PALMER, DA WESOLOWSKI, DJ TI ALUMINUM SPECIATION AND EQUILIBRIA IN AQUEOUS-SOLUTION .2. THE SOLUBILITY OF GIBBSITE IN ACIDIC SODIUM-CHLORIDE SOLUTIONS FROM 30-DEGREES-C TO 70-DEGREES-C SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT TAYLOR COLLOQUIUM ON ORIGIN AND EVOLUTION OF PLANETARY CRUSTS, CELEBRATING STUART ROSS TAYLORS 65TH BIRTHDAY AND HIS RETIREMENT FROM THE RESEARCH SCHOOL OF EARTH SCIENCE CY OCT 01-02, 1990 CL CANBERRA, AUSTRALIA SP INT UNION GEOL SCI, GEOCHEM SOC, ACAD SCI AUSTR, RES SCH EARTH SCI ID STANDARD STATE CONDITIONS; MOLAR HEAT-CAPACITIES; THERMODYNAMIC PROPERTIES; HIGH-TEMPERATURES; REVISED VALUES; FREE-ENERGY; ELECTROLYTES; BOEHMITE; HYDROLYSIS; COMPLEXES AB The solubility of gibbsite in aqueous solutions was measured at ten ionic strengths made up of NaCl, HCl, and AlCl3 at 30, 50, and 70-degrees-C with the initial acidity controlled by addition of HCl. The aluminum concentration was determined by ion chromatography, while the final equilibrium pH was measured at temperature. The equilibrium quotients for the reaction Al(OH)3 + 3H+ reversible Al3+ + 3H2O were modeled using both an empirical equation including the Debye-Huckel term and the Pitzer ion interaction treatment which incorporated the relevant single electrolyte and mixing interaction parameters currently available in the literature. In the latter treatment only four independent variables, including theta(AlNa, psi(AlNaCl), and two terms describing the equilibrium constant at infinite dilution, were needed to fit the data well within the projected experimental error. In general, these new equilibrium quotients differ markedly from results of all but the most recently published solubility studies. The thermodynamic parameters at infinite dilution are compared with those calculated from the individual components of the reaction available in the literature. These calculations lead to recommended thermodynamic values for the Gibbs energy of reaction at 25-degrees-C of -44.2 +/- 0.3 kJ mol-1, a DELTA-G(f)0 (Al3+, aq) of -487.7 +/- 1.5 kJ mol-1, and a DELTA-H(f)0 (Al3+, aq) of -540.9 kJ mol-1. No evidence for aluminum chloride complexation was found by comparing solubility experiments in the presence of varying concentrations of sodium trifluoromethanesulfonate and sodium chloride at 50-degrees-C and ca. 5 molal ionic strength. RP PALMER, DA (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 64 TC 111 Z9 111 U1 4 U2 19 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 MAR PY 1992 VL 56 IS 3 BP 1093 EP 1111 DI 10.1016/0016-7037(92)90048-N PG 19 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HJ963 UT WOS:A1992HJ96300017 ER PT J AU REAGAN, MK VOLPE, AM CASHMAN, KV AF REAGAN, MK VOLPE, AM CASHMAN, KV TI U-238 SERIES AND TH-232-SERIES CHRONOLOGY OF PHONOLITE FRACTIONATION AT MOUNT EREBUS, ANTARCTICA SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID TH-230-U-238 DISEQUILIBRIUM SYSTEMATICS; SIZE DISTRIBUTION CSD; YOUNG VOLCANIC-ROCKS; KILAUEA VOLCANO; ROSS ISLAND; TH; CRYSTALLIZATION; HAWAII; EARTH; MAGMA AB Uranium, thorium, radium, and barium abundances and U-234/U-238 and Th-230/Th-232 isotopic ratios determined by thermal ionization mass spectrometry and (Th-228)/(Th-232) activity ratios determined by alpha spectrometry are used to date anorthoclase growth and infer magma chamber residence times of phonolites erupted in 1984 and 1988 from Mount Erebus, Antarctica. The 1984 and 1988 glasses have slightly different (Th-230)/(Th-232) ratios but both have a 10% excess of (Th-230) over (U-238) and equilibrium (Th-228) values. By comparing these data and Pb-isotopic data reported in SUN and HANSON (1975) to similar data for oceanic basalts, the duration of differentiation from basanite to phonolite is limited to less than 150,000 years. The anorthoclase separates have (Th-230)/(U-238) ratios exceeding those of the associated glasses but have (Th-230)/(Th-232) ratios like those glasses. Both glasses are depleted in Ra-226 with respect to Th-230 by about 25%, whereas associated anorthoclase separates have extreme excesses of Ra-226 over Th-230 and (Th-228)/(Th-232) = 2.2. On a plot of (Ra-226)/Ba vs. (Th-230)/Ba, the glass-anorthoclase pairs produce isochrons averaging 2380 y, which represents the average age of anorthoclase growth in the shallow magma system at Erebus. The implied residence time of phonolite magmas in the shallow magma chamber system of Erebus is about 3000 y. Final crystal growth occurred after intrusion into the convecting lava lake less than decades before eruption. C1 UNIV CALIF LOS ALAMOS SCI LAB,INC 7,LOS ALAMOS,NM 87545. PRINCETON UNIV,DEPT GEOL & GEOPHYS SCI,PRINCETON,NJ 08544. RP REAGAN, MK (reprint author), UNIV IOWA,DEPT GEOL,IOWA CITY,IA 52242, USA. NR 35 TC 58 Z9 59 U1 3 U2 5 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 MAR PY 1992 VL 56 IS 3 BP 1401 EP 1407 DI 10.1016/0016-7037(92)90071-P PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HJ963 UT WOS:A1992HJ96300040 ER PT J AU MURRAY, RW JONES, DL TENBRINK, MRB AF MURRAY, RW JONES, DL TENBRINK, MRB TI DIAGENETIC FORMATION OF BEDDED CHERT - EVIDENCE FROM CHEMISTRY OF THE CHERT-SHALE COUPLET SO GEOLOGY LA English DT Article AB Theories concerning the formation of bedded chert traditionally have emphasized either depositional or diagenetic processes. Major and rare earth element data from Franciscan assemblage (Mesozoic) and Claremont Formation (Miocene) bedded chert sequences, along with physical observations such as the presence of rare and highly corroded radiolarians in shale interbeds, are most consistent with a dominantly diagenetic origin of chert-shale couplets and are incompatible with many depositional theories. Chemical distributions between Franciscan and Claremont bedded chert-shale closely match chemical fractionations recorded by Monterey Formation and Deep Sea Drilling Project-sampled cherts formed by diagenetic SiO2 dissolution, transport, and reprecipitation, suggesting that diagenetic migration of SiO2 from proto-shale to proto-chert is also largely responsible for chert-shale couplets. Identical Ce anomalies (Ce/Ce*) found in immediately adjacent chert-shale layers indicate that turbidites or other transport mechanisms are not responsible for the alternating beds. Neither the chemistry of the chert-shale couplet nor the overall stratigraphy of the sequences is consistent with couplet formation being caused by productivity fluctuations. Chemical mass balance calculations reconstructing the total bulk sediment composition suggest that modem siliceous sequences do not contain enough labile biogenic SiO2 to form entire stratigraphies of bedded chert. C1 UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. NR 18 TC 65 Z9 100 U1 0 U2 20 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD MAR PY 1992 VL 20 IS 3 BP 271 EP 274 DI 10.1130/0091-7613(1992)020<0271:DFOBCE>2.3.CO;2 PG 4 WC Geology SC Geology GA HG520 UT WOS:A1992HG52000020 ER PT J AU FEHLER, M HOSHIBA, M SATO, H OBARA, K AF FEHLER, M HOSHIBA, M SATO, H OBARA, K TI SEPARATION OF SCATTERING AND INTRINSIC ATTENUATION FOR THE KANTO-TOKAI REGION, JAPAN, USING MEASUREMENTS OF S-WAVE ENERGY VERSUS HYPOCENTRAL DISTANCE SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE ATTENUATION; JAPAN; SCATTERING ID RANDOMLY INHOMOGENEOUS LITHOSPHERE; LOCAL EARTHQUAKES; SHEAR-WAVES; CODA WAVES AB Determining the relative amount of attenuation caused by scattering and intrinsic absorption is important to the understanding of wave propagation and attenuation in the heterogeneous lithosphere. A recently developed model based on radiative transfer theory provides a method for quantifying the ratio of scattering loss to total attenuation, which is called seismic albedo. The basic assumption of this model is that the medium is composed of a uniform distribution of isotropic scatterers. The method is based on a theoretical result showing that the variation with source-receiver distance in the seismic energy integrated over time is directly related to albedo and total attenuation, Q(t)-1. We introduce an improvement in the previously used method which results in more reliable estimates of seismic albedo and Q(t)-1, which can be used to calculate the losses due to scattering and intrinsic absorption. We call our new method multiple lapse-time window analysis. The improvement is based on the observation that the relationship between integrated energy and distance is strongly dependent on the time duration over which energy is integrated. We show that parameters describing media attenuation can be estimated from measurements of two ratios from the integrated energy versus distance relations compiled using two time windows for integration. One ratio is the energy integrated from 0 to 15 s after the S-wave arrival observed at 50 km source-receiver distance divided by the energy in the same time interval observed at 150 km distance. The second ratio, is the energy integrated from 0 to 15 s observed at 150 km divided by that from 30 to 100 s observed at the same source-receiver distance. Integrated energy calculated for many source-receiver pairs may be corrected for relative site amplification and relative source amplitude determined using the coda-wave method. These corrections allow us to use data from many source-receiver pairs to find a well-constrained energy versus distance relation. Site amplifications relative to a reference station are calculated for three frequency bands by determining the ratio of the spectral amplitude in each band at one station for a 10 s time window to that at the reference station in the same 10 s time window. Ratios are calculated for many 10 s time windows for each of 10 events. For each station, we found little scatter in the ratios among the windows and events used. The average of all the ratios obtained for each station was taken to be the site amplification relative to the reference station. We applied the multiple lapse-time window analysis method and source-site correction procedures to data from the Kanto-Tokai region of Japan and found that intrinsic attenuation Q(i)-1 is larger than scattering attenuation Q(s)-1 over three frequency bands; 1-2, 2-4, and 4-8 Hz. We found that estimates of coda-wave attenuation Q(c)-1 made using the coda-wave decay method, are similar to the intrinsic attenuation Q(i)-1 for the frequency range of 2-8 Hz. We were unable to fit data for a third integration time window for the lowest frequency band studied. Our inability to fit all the data might be due to the assumptions that scattering is isotropic, that scatterers are uniformly distributed, and that only body waves are observed. We found that the site amplifications and seismic albedos determined for vertical and north-south components of motion are similar. C1 METEOROL RES INST,TSUKUBA,IBARAKI 305,JAPAN. NATL RES INST EARTH SCI & DISASTER PREVENT,TSUKUBA,IBARAKI 305,JAPAN. TOHOKU UNIV,FAC SCI,INST GEOPHYS,AOBA KU,SENDAI,MIYAGI 980,JAPAN. RP FEHLER, M (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,GEOL ENGN GRP,MAIL STOP D443,LOS ALAMOS,NM 87545, USA. NR 28 TC 188 Z9 191 U1 0 U2 6 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 MAR PY 1992 VL 108 IS 3 BP 787 EP 800 DI 10.1111/j.1365-246X.1992.tb03470.x PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HG621 UT WOS:A1992HG62100008 ER PT J AU FELDMAN, DL AF FELDMAN, DL TI INSTITUTIONS FOR MANAGING GLOBAL CLIMATE CHANGE - COMPLIANCE, FAIRNESS, AND UNIVERSAL PARTICIPATION SO GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS LA English DT Article AB Ensuring that treaties designed to manage global climate change are 'implementable' is an important negotiating challenge. Implementable agreements have a reasonable chance of being ratified by nation states that are the greatest contributors to the problem; are acceptable to parties with the resources to do something about it; and induce voluntary compliance. This article contends that, aside from domestic political characteristics, other factors contributing to effective implementation of international agreements are their structure, requirements, and expectations. Factors that optimize implementable agreements include: a sufficient number of relevant participants in negotiations to enhance their legitimacy; reliance on confidence-building to deter non-compliance; stating precisely the signatory obligations; and designing treaties to be renegotiable in the face of changing scientific, political, and economic conditions. Global environmental agreements most likely to obtain signatory compliance will avoid overly stringent standards; allow variable compliance and discretion in implementation; consult domestic interests at each stage of agreement 'design' and execution; permit transfers of resources and technology; and rely on 'functional integration' to build confidence. RP FELDMAN, DL (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,BLDG 4500-N,MAIL STOP 6206,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 2 Z9 2 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0959-3780 J9 GLOBAL ENVIRON CHANG JI Glob. Environ. Change-Human Policy Dimens. PD MAR PY 1992 VL 2 IS 1 BP 43 EP 58 DI 10.1016/0959-3780(92)90035-6 PG 16 WC Environmental Sciences; Environmental Studies; Geography SC Environmental Sciences & Ecology; Geography GA HM405 UT WOS:A1992HM40500006 ER PT J AU KEARL, PM KORTE, NE CRONK, TA AF KEARL, PM KORTE, NE CRONK, TA TI SUGGESTED MODIFICATIONS TO GROUND-WATER SAMPLING PROCEDURES BASED ON OBSERVATIONS FROM THE COLLOIDAL BORESCOPE SO GROUND WATER MONITORING AND REMEDIATION LA English DT Article AB Observations of colloidal movement under natural conditions and during pumping were conducted at several field sites. Results indicate that several modifications to present sampling protocols may improve the representativeness and cost effectiveness of obtaining ground water samples for assessing the total mobile contaminant load. These modifications include the installation of dedicated sampling devices, limited purging of the well prior to sampling, sampling at a flow rate of 100 mL/min, and no filtering of samples. This sampling approach can result in significant cost savings while providing the best possible water samples. RP KEARL, PM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,GRAND JUNCT OFF,GRAND JCT,CO 81502, USA. NR 0 TC 27 Z9 28 U1 0 U2 2 PU GROUND WATER PUBLISHING CO PI WESTERVILLE PA 601 DEMPSEY RD, WESTERVILLE, OH 43081 SN 1069-3629 J9 GROUND WATER MONIT R JI Ground Water Monit. Remediat. PD SPR PY 1992 VL 12 IS 2 BP 155 EP 161 DI 10.1111/j.1745-6592.1992.tb00046.x PG 7 WC Water Resources SC Water Resources GA HQ361 UT WOS:A1992HQ36100012 ER PT J AU PETERS, RW MONTEMAGNO, CD SHEM, L LEWIS, BA AF PETERS, RW MONTEMAGNO, CD SHEM, L LEWIS, BA TI SURFACTANT SCREENING OF DIESEL-CONTAMINATED SOIL SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB At one installation in California, approximately 60,000 gal of No. 2 diesel fuel leaked into the subsurface environment, resulting in contamination at depths from 6 to 34 m below the surface. Argonne National Laboratory was contracted to perform treatability studies for site remediation. This paper summarizes a surfactant screening/surfactant flooding research program in which 22 surfactants were screened for their effectiveness in mobilizing the organics from the contaminated soil prior to bioremediation. Anionic surfactants resulted in the greatest degree of diesel mobilization. The most promising surfactants will be employed on contaminated soil samples obtained from the site. RP PETERS, RW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Lewis, Barbara-Ann/B-7027-2009 NR 0 TC 29 Z9 29 U1 1 U2 3 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0882-5696 J9 HAZARD WASTE HAZARD JI Hazard. Waste Hazard. Mater. PD SPR PY 1992 VL 9 IS 2 BP 113 EP 136 DI 10.1089/hwm.1992.9.113 PG 24 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JE999 UT WOS:A1992JE99900001 ER PT J AU LARSEN, IL LEE, SY BOSTON, HL STETAR, EA AF LARSEN, IL LEE, SY BOSTON, HL STETAR, EA TI DISCOVERY OF A CS-137 HOT PARTICLE IN MUNICIPAL WASTE-WATER TREATMENT SLUDGE SO HEALTH PHYSICS LA English DT Article DE CS-137; RADIATION, GAMMA; BREMSSTRAHLUNG; WATER TREATMENT AB Analysis of primary treatment sludge from a municipal wastewater treatment plant revealed elevated Cs-137 concentrations in one sample. This elevated activity was associated with a radioactive particle that, when isolated and quantified, was found to contain 1.82 kBq of Cs-137. Additional analysis indicated an absence of alpha activity, and energetic beta radiation, if present, was less than the Cs-137 activity. The particle was approximately 50-mu-m in diameter, appeared not to be an aggregate, and was nonmetallic. C1 COLORADO STATE UNIV, DEPT RADIOL HLTH SCI, FT COLLINS, CO 80523 USA. RP LARSEN, IL (reprint author), OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. NR 4 TC 1 Z9 1 U1 0 U2 1 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 MAR PY 1992 VL 62 IS 3 BP 235 EP 238 DI 10.1097/00004032-199203000-00004 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 HE210 UT WOS:A1992HE21000004 PM 1735643 ER PT J AU GILBERT, ES AF GILBERT, ES TI MORTALITY OF WORKERS AT THE OAK-RIDGE-NATIONAL-LABORATORY SO HEALTH PHYSICS LA English DT Letter RP GILBERT, ES (reprint author), PACIFIC NW LAB, CTR LIFE SCI, POB 999, RICHLAND, WA 99352 USA. NR 4 TC 7 Z9 7 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 MAR PY 1992 VL 62 IS 3 BP 260 EP 261 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HE210 UT WOS:A1992HE21000010 PM 1735649 ER PT J AU WING, S SHY, CM WOOD, JL WOLF, S CRAGLE, DL FROME, EL AF WING, S SHY, CM WOOD, JL WOLF, S CRAGLE, DL FROME, EL TI MORTALITY OF WORKERS AT THE OAK-RIDGE-NATIONAL-LABORATORY - REPLY SO HEALTH PHYSICS LA English DT Letter ID HANFORD SITE; SMOKING; RADIATION; RISK C1 OAK RIDGE ASSOCIATED UNIV, CTR EPIDEMIOL RES, OAK RIDGE, TN 37830 USA. OAK RIDGE NATL LAB, MATH SCI SECT, OAK RIDGE, TN 37830 USA. RP WING, S (reprint author), UNIV N CAROLINA, SCH PUBL HLTH, DEPT EPIDEMIOL, CHAPEL HILL, NC 27599 USA. NR 11 TC 6 Z9 6 U1 1 U2 1 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 MAR PY 1992 VL 62 IS 3 BP 261 EP 264 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 HE210 UT WOS:A1992HE21000011 ER PT J AU VARGO, GJ AF VARGO, GJ TI GRAPH, VERSION-3.02 SO HEALTH PHYSICS LA English DT Software Review RP VARGO, GJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD MAR PY 1992 VL 62 IS 3 BP 267 EP 267 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HE210 UT WOS:A1992HE21000014 ER PT J AU BUCKNER, MA AF BUCKNER, MA TI JAVA, VERSION-1.40 SO HEALTH PHYSICS LA English DT Software Review RP BUCKNER, MA (reprint author), OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, POB 2008, OAK RIDGE, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD MAR PY 1992 VL 62 IS 3 BP 268 EP 269 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HE210 UT WOS:A1992HE21000015 ER PT J AU KAWABATA, C TAKEUCHI, M BISHOP, AR AF KAWABATA, C TAKEUCHI, M BISHOP, AR TI VORTEX AND DOMAIN-WALL DYNAMICS OF 2D-XY MODEL WITH INPLANE MAGNETIC-FIELD SO HELVETICA PHYSICA ACTA LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON PHYSICS IN 2 DIMENSIONS CY AUG 19-23, 1991 CL NEUCHATEL, SWITZERLAND SP ASEA BROWN BOVERI BADEN, CABLES CORTAILLOD, CITY NEUCHATEL, CRYOPHYSICS, ELECTRICITE, ETH ZURICH, IBM ZURICH, RES LAB, IBM SWITZERLAND, PAUL SCHERRER INST, SWISS BANK AB Using a combined Monte Carlo-spin dynamics technique, we have studied vortex and domain wall excitations on square 30 x 30 and 60 x 60 lattices for the classical XY model with an in-plane magnetic field. We have isolated and followed the dynamics of vortices and domain walls. We have obtained the density of free vortices and the dynamical structure factor S(q,w) at various temperatures. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KAWABATA, C (reprint author), OKAYAMA UNIV,CTR COMP,OKAYAMA 700,JAPAN. NR 6 TC 1 Z9 1 U1 0 U2 0 PU BIRKHAUSER VERLAG AG PI BASEL PA PO BOX 133 KLOSTERBERG 23, CH-4010 BASEL, SWITZERLAND SN 0018-0238 J9 HELV PHYS ACTA JI Helv. Phys. Acta PD MAR PY 1992 VL 65 IS 2-3 BP 467 EP 468 PG 2 WC Physics, Multidisciplinary SC Physics GA HR053 UT WOS:A1992HR05300098 ER PT J AU HACKER, BC AF HACKER, BC TI MILITARY INSTITUTIONS AND WORLD-HISTORY SO HISTORIAN LA English DT Article; Proceedings Paper CT 1991 ANNUAL MEETING OF THE SOC FOR MILITARY HISTORY CY MAR, 1991 CL DUKE UNIV, NC SP SOC MIL HIST HO DUKE UNIV RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 92 TC 0 Z9 0 U1 0 U2 0 PU PHI ALPHA THETA PI ALLENTOWN PA THE HISTORIAN 50 COLLEGE DR, ALLENTOWN, PA 18104-6100 SN 0018-2370 J9 HISTORIAN JI Historian PD SPR PY 1992 VL 54 IS 3 BP 425 EP 440 DI 10.1111/j.1540-6563.1992.tb00860.x PG 16 WC History SC History GA HX326 UT WOS:A1992HX32600002 ER PT J AU PERRY, BA MOHRENWEISER, HW AF PERRY, BA MOHRENWEISER, HW TI HUMAN TRIOSEPHOSPHATE ISOMERASE - SUBSTITUTION OF ARG FOR GLY AT POSITION 122 IN A THERMOLABILE ELECTROMORPH VARIANT, TPI-MANCHESTER SO HUMAN GENETICS LA English DT Article ID PROLIFERATION SPECIFIC ISOZYME; NUCLEOTIDE-SEQUENCE; ALTERED ENZYME; GENOMIC DNA; ACTIVE-SITE; DEFICIENCY; GENE; EXPRESSION; THERMOSTABILITY; MUTAGENESIS AB Denaturing gradient gel electrophoreses of polymerase chain reaction amplified DNA products and subsequent direct sequencing identified a G-to-A transition causing a replacement of Gly 122 with Arg in an electrophoretic mobility variant of human triosephosphate isomerase, TPI-Manchester. This was the only TPI electromorph variant detected in screening of > 3,400 humans in an Ann Arbor, Mich. population. This substitution is at the amino terminus or solvent interaction end of the fifth beta-sheet of the alpha/beta-barrel structure. The TPI-Manchester variant is a thermolabile enzyme, but the stability of the variant enzyme is not sensitive to other denaturants. This amino acid substitution does not involve residues of the active site and does not detectably alter the kinetic properties of the enzyme. The data provide additional insight into the amino acid residues that are important for the maintenance of the structural characteristics of this very evolutionary constrained protein. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,L-452,LIVERMORE,CA 94550. NR 36 TC 17 Z9 19 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-6717 J9 HUM GENET JI Hum. Genet. PD MAR PY 1992 VL 88 IS 6 BP 634 EP 638 DI 10.1007/BF02265287 PG 5 WC Genetics & Heredity SC Genetics & Heredity GA HL488 UT WOS:A1992HL48800006 PM 1339398 ER PT J AU CURTIS, SA AF CURTIS, SA TI CULTURAL RELATIVISM AND RISK-ASSESSMENT STRATEGIES FOR FEDERAL PROJECTS SO HUMAN ORGANIZATION LA English DT Article DE RISK-ASSESSMENT; NATIVE AMERICANS; TRANSPORTATION OF HAZARDOUS RADIOLOGICAL WASTE; LAND USE IMPACTS; CULTURAL RELATIVISM AB Risk analysts must incorporate the principles of cultural relativism into their studies. Sensitive sociocultural groups must be identified, particularly those populations that have strong ties to their land and that may not be adequately represented in standard demographic data bases or easily investigated through an analysis of secondary literature. This paper explores the types of risk impacts that may be perceived by one special population, Native American tribes, and the current issues that influence these perceptions. RP CURTIS, SA (reprint author), ARGONNE NATL LAB,DIV ENVIRONM ASSESSMENT & INFORMAT SCI,SYST SCI GRP,ARGONNE,IL 60439, USA. NR 35 TC 13 Z9 13 U1 1 U2 3 PU SOC APPLIED ANTHROPOLOGY PI OKLAHOMA CITY PA BUSINESS OFFICE BOX 24083, OKLAHOMA CITY, OK 73124 SN 0018-7259 J9 HUM ORGAN JI Hum. Organ. PD SPR PY 1992 VL 51 IS 1 BP 65 EP 70 PG 6 WC Anthropology; Social Sciences, Interdisciplinary SC Anthropology; Social Sciences - Other Topics GA HG134 UT WOS:A1992HG13400007 ER PT J AU LAMPERT, CM AF LAMPERT, CM TI SMART WINDOWS SWITCH ON THE LIGHT SO IEEE CIRCUITS AND DEVICES MAGAZINE LA English DT Article RP LAMPERT, CM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 7 Z9 7 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 8755-3996 J9 IEEE CIRCUIT DEVIC JI IEEE Circuit Devices Mag. PD MAR PY 1992 VL 8 IS 2 BP 19 EP 26 DI 10.1109/101.127309 PG 8 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA HK991 UT WOS:A1992HK99100005 ER PT J AU HETHERINGTON, DL KLEM, JF WEAVER, HT AF HETHERINGTON, DL KLEM, JF WEAVER, HT TI A GAAS MEMORY DEVICE UTILIZING A BURIED JFET CHANNEL FOR NONDESTRUCTIVE CHARGE SENSING SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID THERMIONIC EMISSION; CAPACITORS AB A new GaAs memory cell consists of a monolithic element in which a P-i-N-i-P epitaxial structure stores charge and a buried p-channel FET senses charge. Measured storage times up to 40 s were observed at 300 K with minimal effects on charge decay for applied drain voltages of V(DS) = +/- 1.5 V. Electrical write and erase techniques are demonstrated and discussed. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HETHERINGTON, DL (reprint author), UNIV ARIZONA,TUCSON,AZ 85721, USA. NR 12 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD MAR PY 1992 VL 13 IS 3 BP 146 EP 148 DI 10.1109/55.144992 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HE796 UT WOS:A1992HE79600004 ER PT J AU GERSTL, SAW BOREL, CC AF GERSTL, SAW BOREL, CC TI PRINCIPLES OF THE RADIOSITY METHOD VERSUS RADIATIVE-TRANSFER FOR CANOPY REFLECTANCE MODELING SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article AB The radiosity method is introduced to plant canopy reflectance modeling. We review the physics principles of the radiosity method which originates in thermal radiative transfer analysis when hot and cold surfaces are considered within a given enclosure. The radiosity equation, which is an energy balance equation for discrete surfaces, is described and contrasted with the radiative transfer equation, which is a volumetric energy balance equation. Comparing the strengths and weaknesses of the radiosity formulation with those of the radiative transfer formulation for canopy reflectance modeling, we conclude that both methods are complementary to each other. Results of a sample calculation are given for a simplified canopy model with 4000 leaves. RP GERSTL, SAW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV SPACE SCI & TECHNOL,REMOTE SENSING SCI PROGRAM,LOS ALAMOS,NM 87545, USA. RI Borel, Christoph/P-2528-2014 NR 24 TC 22 Z9 24 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAR PY 1992 VL 30 IS 2 BP 271 EP 275 DI 10.1109/36.134077 PG 5 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA HP272 UT WOS:A1992HP27200008 ER PT J AU CASPI, S HELM, M LASLETT, LJ AF CASPI, S HELM, M LASLETT, LJ TI THE USE OF A RELAXATION METHOD TO CALCULATE THE 3D MAGNETIC-FIELD CONTRIBUTION OF AN IRON YOKE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT CONF ON THE COMPUTATION OF ELECTROMAGNETIC FIELDS ( COMPUMAG ) CY JUL 07-11, 1991 CL SORRENTO, ITALY SP INST ELECT ENGINEERS, IEEE, MAGNET SOC JAPAN, MINIST AFFAIRES ESTERI ITALY, MINIST UNIV RICH SCI & TECHNOL ITALY, SOC ELECTRICIENS & ELECTRONICIENS, ASSOC ELETTROTECN ITALINA, CNR, EUROPEAN PHYS SOC AB A computational procedure has been developed for calculating the three-dimensional field produced by an axisymmetric iron yoke of high permeability in the presence of a system of conductors. The procedure is particularly applicable to the end regions of multipole magnets of the sort used in particle accelerators. The field produced by the conductors is calculated using the Biot-Savart law. We speak of the field contribution of the yoke as an "image field", although it is associated with a distinctly diffuse distribution of image currents or magnetic moments. At every point on the boundary of the yoke the total scalar potential is constant, so V(i) = -V(d) where i = image and d = direct contribution from the conductors. If we describe both potentials as a series of "harmonic components" with respect to azimuthal dependence, then the nature of the boundary condition is such that a de-coupling of one harmonic component from another is preserved and therefore it is also true that V(i)(n) = -V(d)(n) at the iron interface, where n is a harmonic number. If we solve the appropriate individual differential equations for the scalar potential functions V(i)(n) throughout the iron-free region, with the proper applied boundary condition for the scalar potential of each harmonic number, we shall achieve upon summation the appropriate potential function to describe the field contribution of the surrounding high-permeability iron. RP CASPI, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BLDG 46-161,BERKELEY,CA 94720, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1992 VL 28 IS 2 BP 1096 EP 1098 DI 10.1109/20.123873 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HH317 UT WOS:A1992HH31700024 ER PT J AU KETTUNEN, L TURNER, LR AF KETTUNEN, L TURNER, LR TI A VOLUME INTEGRAL FORMULATION FOR NONLINEAR MAGNETOSTATICS AND EDDY CURRENTS USING EDGE ELEMENTS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article AB The properties of Whitney elements provide the basis of a new integral formulation for solving three-dimensional (3-D) magnetostatics and eddy-current problems. Using a tree structure reduces the number of unknowns to a few less than the number of nodes for the static case, a significant saving over earlier integral formulations. Interface conditions are satisfied exactly, but the material constitutive relations, only approximately. The resulting magnetostatics code, GFUNET, is attractive in terms of convenience, CPU time utilization and accuracy. It realizes much of the speedup promised by parallel computing. Results for an accelerator sextupole magnet and for TEAM Workshop problem #13 are presented. RP KETTUNEN, L (reprint author), ARGONNE NATL LAB, DIV ADV PHOTON SOURCE ACCELERATOR SYST, ARGONNE, IL 60439 USA. NR 8 TC 17 Z9 17 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9464 EI 1941-0069 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1992 VL 28 IS 2 BP 1639 EP 1642 DI 10.1109/20.124015 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HH317 UT WOS:A1992HH31700161 ER PT J AU SCHIFFER, M KABAT, EA WU, TT AF SCHIFFER, M KABAT, EA WU, TT TI SUBGROUPS OF TCR ALPHA-CHAINS AND CORRELATION WITH T-CELL FUNCTION SO IMMUNOGENETICS LA English DT Article ID VARIABLE REGION GENES; RECEPTOR BETA-CHAINS; ANTIGEN-RECEPTOR; V-ALPHA; CHROMOSOME-14 INVERSION; ALLELIC EXCLUSION; MYELOMA PROTEINS; GERMLINE GENE; LYMPHOCYTES-T; LIGHT-CHAINS AB T-cell receptor (Tcr) alpha-chains are classified into four subgroups (I, II, III, and miscellaneous) based on the amino acid residues at positions 61 and 62. Subgroup I has Gly Phe at these positions, subgroup II has Arg Phe, subgroup III has Arg Leu, and subgroup miscellaneous has several other combinations. Variability plots for subgroups I, II, and III sequences show higher values around positions 93-103, 105, 108, 111, 113, and 115, suggesting that these positions may interact with the processed antigen molecules. Smaller peaks are present at various other regions which may bind the major histocompatibility complex class I or II molecules. The patterns of variability within one subgroup are similar for all species, for human alone, and for mouse alone. These subgroup patterns appear much less complicated than patterns for sequences in all subgroups taken together, implying that subgroups may be related to Tcr functions. Among 83 mouse chains, 15 are from cytotoxic cells and 40 from helper cells. Of the 15 from cytotoxic cells, 11, 2, 0, and 2 are in subgroups I, II, III, and miscellaneous; and of the 40 from helper cells, 9, 16, 12, and 3 are in subgroups I, II, III, and miscellaneous, respectively. Thus, a correlation between sequence and function of Tcr Tcr-alpha-chains seems possible. C1 COLUMBIA UNIV,DEPT MICROBIOL,NEW YORK,NY 10032. COLUMBIA UNIV,DEPT GENET & DEV,NEW YORK,NY 10032. COLUMBIA UNIV,DEPT NEUROL,NEW YORK,NY 10032. COLUMBIA UNIV,INST CANC RES,NEW YORK,NY 10032. NIH,OFF DIRECTOR,BETHESDA,MD 20892. NORTHWESTERN UNIV,DEPT APPL MATH,EVANSTON,IL 60201. NORTHWESTERN UNIV,DEPT BIOMED ENGN,EVANSTON,IL 60201. NORTHWESTERN UNIV,DEPT BIOCHEM,EVANSTON,IL 60201. NORTHWESTERN UNIV,DEPT MOLEC BIOL,EVANSTON,IL 60201. NORTHWESTERN UNIV,DEPT CELL BIOL,EVANSTON,IL 60201. RP SCHIFFER, M (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439, USA. RI Wu, Tai/B-7638-2009 FU NIAID NIH HHS [5R01-AI25616-03, 2R01-AI19042-07A2, 5R01-AI127508-03] NR 81 TC 15 Z9 15 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0093-7711 J9 IMMUNOGENETICS JI Immunogenetics PD MAR PY 1992 VL 35 IS 4 BP 224 EP 234 DI 10.1007/BF00166827 PG 11 WC Genetics & Heredity; Immunology SC Genetics & Heredity; Immunology GA HJ373 UT WOS:A1992HJ37300002 PM 1531805 ER PT J AU HAAS, PA AF HAAS, PA TI FORMATION OF UNIFORM LIQUID-DROPS BY APPLICATION OF VIBRATION TO LAMINAR JETS SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article AB Gel-sphere processes require the formation of liquid drops of controlled and uniform diameter with production rates of 10(3)-10(7) drops/min. In this report, procedures and equipment are described that apply vibration to give a controlled breakup of laminar liquid jet streams into uniform drops. Criteria are also given for the selection of jet diameters, jet velocities, and vibrational frequencies and for the configuration of the apparatus to produce drops of 500-5000-mu-m diameters. In this work, the standard deviations of product sphere diameters (based on the log-normal size distributions) were 1.01-1.05. RP HAAS, PA (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,BLDG 4500N,OAK RIDGE,TN 37931, USA. NR 8 TC 15 Z9 17 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD MAR PY 1992 VL 31 IS 3 BP 959 EP 967 DI 10.1021/ie00003a043 PG 9 WC Engineering, Chemical SC Engineering GA HH512 UT WOS:A1992HH51200044 ER PT J AU ROBERTS, JM BERTMAN, SB AF ROBERTS, JM BERTMAN, SB TI THE THERMAL-DECOMPOSITION OF PEROXYACETIC NITRIC ANHYDRIDE (PAN) AND PEROXYMETHACRYLIC NITRIC ANHYDRIDE (MPAN) SO INTERNATIONAL JOURNAL OF CHEMICAL KINETICS LA English DT Article ID ATMOSPHERIC CHEMISTRY; PEROXYBENZOYL NITRATE; NITROGEN-OXIDES; GAS-PHASE; TROPOSPHERE; HYDROCARBONS; GENERATION; STABILITY; MECHANISM; RADICALS AB The rate coefficients of thermal decomposition of peroxyacetic nitric anhydride (PAN) and peroxymethacrylic nitric anhydride (MPAN) were measured over the temperature range 302-323 K. The resulting Arrhenius expressions were k = 10(17.4 +/- 0.4) exp(-28.5 +/- 0.5/RT) for PAN, and k = 10(16.2 +/- 0.7) exp(-26.8 +/- 1.0/RT) for MPAN, where the activation energy is in Kcal/mol. These results are in good agreement with previous studies of PAN and other PAN-type compounds, and imply that energies of RC(O)OO-NO2 bonds are relatively independent of the nature of R. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973. RI Roberts, James/A-1082-2009 OI Roberts, James/0000-0002-8485-8172 NR 33 TC 80 Z9 81 U1 2 U2 13 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0538-8066 J9 INT J CHEM KINET JI Int. J. Chem. Kinet. PD MAR PY 1992 VL 24 IS 3 BP 297 EP 307 DI 10.1002/kin.550240307 PG 11 WC Chemistry, Physical SC Chemistry GA HE024 UT WOS:A1992HE02400006 ER PT J AU MOLLER, KD SCARDINO, D SEARS, T CARLSON, D HIRSCHMUGL, CJ WILLIAMS, GP CHANG, E LIU, HT AF MOLLER, KD SCARDINO, D SEARS, T CARLSON, D HIRSCHMUGL, CJ WILLIAMS, GP CHANG, E LIU, HT TI HIGH-RESOLUTION FOURIER-TRANSFORM SPECTROSCOPY USING INFRARED SYNCHROTRON RADIATION .1. INSTRUMENTATION SO INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES LA English DT Article DE HIGH RESOLUTION MACH-ZENDER INTERFEROMETER; FOLDED BEAM FOURIER TRANSFORM SPECTROSCOPY AB A compact high resolution (.002 cm-1) vacuum Fourier transform spectrometer for use with far infrared synchrotron radiation was constructed at the National Synchrotron Light Source at Brookhaven National Laboratory. The spectrometer may be operated using a gas cell of path length of 2 m and a He cooled bolometer with NEP of 10(-13). The pure rotational spectrum of Ammonia was used to test the spectrometer. C1 NEW JERSEY INST TECHNOL,NEWARK,NJ 07102. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV MASSACHUSETTS,AMHERST,MA 01003. UNIV SCI & TECHNOL CHINA,HEFEI,PEOPLES R CHINA. RP MOLLER, KD (reprint author), FAIRLEIGH DICKINSON UNIV,TEANECK,NJ 07666, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 3 TC 1 Z9 1 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-9271 J9 INT J INFRARED MILLI JI Int. J. Infrared Millimeter Waves PD MAR PY 1992 VL 13 IS 3 BP 275 EP 287 DI 10.1007/BF01010664 PG 13 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HF309 UT WOS:A1992HF30900002 ER PT J AU PROTOPOPESCU, V YAGER, R DOCKERY, J AF PROTOPOPESCU, V YAGER, R DOCKERY, J TI COMBAT MODELING WITH IMPRECISE DATA SO INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS LA English DT Article ID FUZZY DIFFERENTIAL-CALCULUS; INTEGRATION AB We apply the fuzzy description to some analytic models of combat, based on ordinary differential equations. The extension to a more involved partial differential equations model is briefly mentioned. The merits of the fuzzy description versus the deterministic or probabilistic descriptions are discussed. C1 IONA COLL,INST MACHINE INTELLIGENCE,NEW ROCHELLE,NY 10801. ORG JOINT CHIEFS STAFF,WASHINGTON,DC 20301. RP PROTOPOPESCU, V (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0884-8173 J9 INT J INTELL SYST JI Int. J. Intell. Syst. PD MAR PY 1992 VL 7 IS 3 BP 277 EP 291 DI 10.1002/int.4550070304 PG 15 WC Computer Science, Artificial Intelligence SC Computer Science GA HE415 UT WOS:A1992HE41500003 ER PT J AU BALATSKY, A AF BALATSKY, A TI SPIN SINGLET QUANTUM HALL-EFFECT AND NONABELIAN LANDAU-GINZBURG THEORY SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT ADRIATICO RESEARCH CONF AND MINIWORKSHOP ON STRONGLY CORRELATED ELECTRON SYSTEMS III CY JUL 08-AUG 02, 1991 CL TRIESTE, ITALY SP INT CTR THEORET PHYS, CNR, SCUOLA INT SUPER STUDI AVANZATI AB In this paper we present a theory of Singlet Quantum Hall Effect (SQHE). We show that the Halperin-Haldane SQHE wave function can be written in the form of a product of a wave function for charged semions in a magnetic field and a wave function for the Chiral Spin Liquid of neutral spin-1/2 semions. We introduce field-theoretic model in which the electron operators are factorized in terms of charged spinless semions (holons) and neutral spin-1/2 semions (spinons). Broken time reversal symmetry and short ranged spin correlations lead to SU(2)k = 1 Chern-Simons term in Landau-Ginzburg action for SQHE phase. We construct appropriate coherent states for SQHE phase and show the existence of SU(2) valued gauge potential. This potential appears as a result of "spin rigidity" of the ground state against any displacements of nodes of wave function from positions of the particles and reflects the nontrivial monodromy in the presence of these displacements. We argue that topological structure of SU(2)k = 1 Chern-Simons theory unambiguously dictates semion statistics of spinons. RP BALATSKY, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,MS B262,LOS ALAMOS,NM 87544, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD MAR PY 1992 VL 6 IS 5-6 BP 765 EP 788 DI 10.1142/S0217979292000463 PG 24 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA HN620 UT WOS:A1992HN62000022 ER PT J AU KATAOKA, Y BASIC, I PERRIN, J GRDINA, DJ AF KATAOKA, Y BASIC, I PERRIN, J GRDINA, DJ TI ANTIMUTAGENIC EFFECTS OF RADIOPROTECTOR WR-2721 AGAINST FISSION-SPECTRUM NEUTRONS AND CO-60 GAMMA-RAYS IN MICE SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID WHOLE-BODY EXPOSURE; V79 CELLS; S-2-(3-AMINOPROPYLAMINO)-ETHYLPHOSPHOROTHIOIC ACID; CHEMICAL PROTECTION; IONIZING-RADIATION; INDUCED MUTATIONS; MUTANT FREQUENCY; LYMPHOCYTES; WR1065; 2-<(AMINOPROPYL)AMINO>ETHANETHIOL AB The antimutagenic effects of the radiation protective agent, S-2-(3-aminopropylamino)ethylphosphorothioic acid (WR-2721), were studied against fission-spectrum-neutron- and Co-60-gamma-ray-induced mutagenesis in mice. Mutagenesis at the hypoxanthine-guanine phosphoribosyl transferase (hprt) locus was measured 56 days following whole-body irradiation with JANUS neutrons (single doses, 50-150 cGy) or Co-60 photons (single doses, 250-750 cGy). Splenic T lymphocytes from B6CF1 mice were grown in round-bottomed 96-microwell culture plates with or without the selective agent 6-thioguanine (6-TG). The mutant frequency, as a result of exposure to neutrons or Co-60 photons, increased 100-fold with dose. Doses of 150 cGy neutrons and 750 cGy Co-60 photons were equally mutagenic. When animals were injected with WR-2721 at a dose of 400 mg/kg body weight, i.p., 30 min before whole-body irradiation with JANUS neutrons or Co-60 photons, mutant frequencies were significantly reduced at all radiation doses (i.e. protection factors of 1.4 and 2.4, respectively). Thus, the aminothiols are effective antimutagens. A novel clinical application of these compounds could be in their use to protect against radiation- and/or chemotherapy-induced genotoxic damage to normal cells. C1 ARGONNE NATL LAB,DIV SOLID STATE PHYS,9700 S CASS AVE,ARGONNE,IL 60439. UNIV ZAGREB,DEPT ANIM PHYSIOL,YU-41000 ZAGREB,YUGOSLAVIA. UNIV CHICAGO,MED CTR,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. FU NCI NIH HHS [CA 37435] NR 27 TC 41 Z9 41 U1 0 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 MAR PY 1992 VL 61 IS 3 BP 387 EP 392 DI 10.1080/09553009214551081 PG 6 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 HH194 UT WOS:A1992HH19400013 PM 1347072 ER PT J AU PANCAKE, CM BAILEY, R BARKAI, D SMITH, B BRANDENBURG, J DONGARRA, J KALOS, M SNIR, M GELERNTER, D AF PANCAKE, CM BAILEY, R BARKAI, D SMITH, B BRANDENBURG, J DONGARRA, J KALOS, M SNIR, M GELERNTER, D TI WHAT SHOULD WE EXPECT FROM PARALLEL LANGUAGE STANDARDS SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Discussion C1 CORNELL UNIV,CTR THEORY,ITHACA,NY 14853. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. INTEL CORP,SUPERCOMP SYST,SANTA CLARA,CA 95051. UNIV TENNESSEE,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN. YALE UNIV,DEPT COMP SCI,NEW HAVEN,CT 06520. CORNELL UNIV,CTR THEORY & SIMULAT SCI & ENGN,ITHACA,NY 14853. IBM CORP,THOMAS J WATSON RES CTR,PARALLEL SYST ORG,YORKTOWN HTS,NY 10598. RP PANCAKE, CM (reprint author), AUBURN UNIV,FAC COMP ENGN,DEPT COMP SCI & ENGN,AUBURN,AL 36849, USA. RI Snir, Marc/B-1050-2009 OI Snir, Marc/0000-0002-3504-2468 NR 10 TC 1 Z9 1 U1 0 U2 0 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SPR PY 1992 VL 6 IS 1 BP 112 EP 117 PG 6 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA HR667 UT WOS:A1992HR66700006 ER PT J AU PHAM, H AF PHAM, H TI OPTIMAL-DESIGN OF MAJORITY REDUNDANT-SYSTEMS SO INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE LA English DT Article AB In many critical applications of digital systems, fault tolerance has been an essential architectural attribute for achieving high reliability. This paper considers the problem of determining the optimal threshold level for majority systems so as to minimize the average system cost. Some numerical examples are given to illustrate the results. RP PHAM, H (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7721 J9 INT J SYST SCI JI Int. J. Syst. Sci. PD MAR PY 1992 VL 23 IS 3 BP 443 EP 448 DI 10.1080/00207729208949220 PG 6 WC Automation & Control Systems; Computer Science, Theory & Methods; Operations Research & Management Science SC Automation & Control Systems; Computer Science; Operations Research & Management Science GA HH995 UT WOS:A1992HH99500013 ER PT J AU PHAM, H AF PHAM, H TI OPTIMAL NUMBER OF COMPONENTS FOR A PARALLEL SYSTEM WITH COMPETING FAILURE MODES SO INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE LA English DT Article ID RELIABILITY AB The problem is treated of achieving optimal system size for a parallel redundant system assuming that failure may take either of two forms. We assume that components are statistically independently distributed and the two kinds of system failures can have different costs. The probabilities are given of component failure in open and short modes, q0 and q(s), respectively. We determine the optimal system size n which minimizes the average system cost. A numerical example is given to illustrate the results. RP PHAM, H (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 6 TC 2 Z9 2 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7721 J9 INT J SYST SCI JI Int. J. Syst. Sci. PD MAR PY 1992 VL 23 IS 3 BP 449 EP 455 DI 10.1080/00207729208949221 PG 7 WC Automation & Control Systems; Computer Science, Theory & Methods; Operations Research & Management Science SC Automation & Control Systems; Computer Science; Operations Research & Management Science GA HH995 UT WOS:A1992HH99500014 ER PT J AU GATHERS, GR AF GATHERS, GR TI MONTE-CARLO STUDIES OF MULTIWAVELENGTH PYROMETRY USING LINEARIZED EQUATIONS SO INTERNATIONAL JOURNAL OF THERMOPHYSICS LA English DT Article DE HIGH TEMPERATURES; MULTIWAVELENGTH PYROMETRY; PYROMETR, TEMPERATURE MEASUREMENTS AB Multiwavelength pyrometry has been advertised as giving significant improvement in precision by overdetermining the solution with extra wavelengths and using least squares methods. Hiernaut et al. [1] have described a six-wavelength pyrometer for measurements in the range 2000 to 5000 K. They use the Wien approximation and model the logarithm of the emissivity as a linear function of wavelength in order to produce linear equations. The present work examines the measurement errors associated with their technique. RP GATHERS, GR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 5 TC 15 Z9 15 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-928X J9 INT J THERMOPHYS JI Int. J. Thermophys. PD MAR PY 1992 VL 13 IS 2 BP 361 EP 382 DI 10.1007/BF00504443 PG 22 WC Thermodynamics; Chemistry, Physical; Mechanics; Physics, Applied SC Thermodynamics; Chemistry; Mechanics; Physics GA HE407 UT WOS:A1992HE40700012 ER PT J AU SEIDEL, RW AF SEIDEL, RW TI GERMAN NATIONAL SOCIALISM AND THE QUEST FOR NUCLEAR-POWER, 1939-1949 - WALKER,M SO ISIS LA English DT Book Review RP SEIDEL, RW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0021-1753 J9 ISIS JI Isis PD MAR PY 1992 VL 83 IS 1 BP 170 EP 170 DI 10.1086/356093 PG 1 WC History & Philosophy Of Science SC History & Philosophy of Science GA HL978 UT WOS:A1992HL97800079 ER PT J AU NEVINS, WM AF NEVINS, WM TI DONT DROP FUSION SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Letter RP NEVINS, WM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,ITER DESIGN,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD SPR PY 1992 VL 8 IS 3 BP 24 EP 26 PG 3 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA HN595 UT WOS:A1992HN59500031 ER PT J AU HAPPER, W AF HAPPER, W TI DONT DROP FUSION SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Letter RP HAPPER, W (reprint author), US DOE,OFF ENERGY RES,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD SPR PY 1992 VL 8 IS 3 BP 26 EP 26 PG 1 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA HN595 UT WOS:A1992HN59500032 ER PT J AU DRELL, SD AF DRELL, SD TI ABOLISHING LONG-RANGE NUCLEAR MISSILES SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Editorial Material RP DRELL, SD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD SPR PY 1992 VL 8 IS 3 BP 34 EP 35 PG 2 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA HN595 UT WOS:A1992HN59500037 ER PT J AU DOEFF, MM VISCO, SJ DEJONGHE, LC AF DOEFF, MM VISCO, SJ DEJONGHE, LC TI THE USE OF REDOX POLYMERIZATION ELECTRODES IN LITHIUM BATTERIES WITH LIQUID ELECTROLYTES SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Note RP DOEFF, MM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Doeff, Marca/G-6722-2013 OI Doeff, Marca/0000-0002-2148-8047 NR 3 TC 14 Z9 14 U1 0 U2 2 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 MAR PY 1992 VL 22 IS 3 BP 307 EP 309 DI 10.1007/BF01030194 PG 3 WC Electrochemistry SC Electrochemistry GA HE542 UT WOS:A1992HE54200019 ER PT J AU RADWAY, JC WEISSMAN, JC WILDE, EW BENEMANN, JR AF RADWAY, JC WEISSMAN, JC WILDE, EW BENEMANN, JR TI EXPOSURE OF FISCHERELLA [MASTIGOCLADUS] TO HIGH AND LOW-TEMPERATURE EXTREMES - STRAIN EVALUATION FOR A THERMAL MITIGATION PROCESS SO JOURNAL OF APPLIED PHYCOLOGY LA English DT Article DE FISCHERELLA; MASTIGOCLADUS; THERMOPHILIC CYANOBACTERIA; TEMPERATURE TOLERANCE; THERMAL MITIGATION ID CULTURE; GROWTH AB In conjunction with a proposed algal cultivation scheme utilizing thermal effluent, twelve Fischerella strains were tested for tolerance to temperatures above and below their growth range. Exposure to 65-degrees-C or 70-degrees-C for 30 min caused bleaching and death of most or all cells. Effects of 60-degrees-C exposure for periods of up to 2 h ranged from undetectable to severe for the various strains. Chlorophyll a content typically decreased 21-22% immediately following 60-degrees-C or 65-degrees-C (1 h) exposure. However, the 60-degrees-C-shocked cultures regained normal Chl a content after 24 h at 45-degrees-C, whereas Chl a in 65-degrees-C-shocked cultures immediately lost visible autofluorescence and was later degraded. Exposure to 15-degrees-C virtually stopped growth of all strains during a 48 h exposure period. Most strains grew as rapidly as 45-degrees-C controls when restored to 45-degrees-C, while a few strains recovered more slowly. Comparison with dark-incubated controls indicated that photooxidative damage did not occur during cold shock. Certain strains exhibited relatively rapid recovery from both heat and cold exposure, thus meeting the temperature tolerance criteria for the proposed algal cultivation process. C1 MICROBIAL PROD INC,VERO BEACH,FL 32962. SAVANNAH RIVER CO,AIKEN,SC 29808. RP RADWAY, JC (reprint author), MICROBIAL PROD INC,PAR POND LAB,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 19 TC 7 Z9 7 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0921-8971 J9 J APPL PHYCOL JI J. Appl. Phycol. PD MAR PY 1992 VL 4 IS 1 BP 67 EP 77 DI 10.1007/BF00003962 PG 11 WC Biotechnology & Applied Microbiology; Marine & Freshwater Biology SC Biotechnology & Applied Microbiology; Marine & Freshwater Biology GA HP387 UT WOS:A1992HP38700009 ER PT J AU HESS, NJ SCHIFERL, D AF HESS, NJ SCHIFERL, D TI COMPARISON OF THE PRESSURE-INDUCED FREQUENCY-SHIFT OF SM-YAG TO THE RUBY AND NITROGEN VIBRON PRESSURE SCALES FROM 6-K TO 820-K AND 0 TO 25 GPA AND SUGGESTIONS FOR USE AS A HIGH-TEMPERATURE PRESSURE CALIBRANT SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RAMAN-SPECTROSCOPY; FLUORESCENCE AB The pressure-induced frequency shift of the Sm:YAG Y1 peak at elevated temperature is calibrated against the temperature-corrected Raman shift of the nitrogen vibron and, at temperatures less than 673 K, the R1 shift of ruby. The results presented here indicate that pressure can be determined from the Y1 and Y2 peak frequencies, without temperature correction, from 6 to 820 K and from 1 bar to 25 GPa by using the equations: P(GPa) = -0.12204 (omega(obs)Y1 -16187.2) and P(GPa) = -0.15188 omega(obs)Y2 -16232.2). However, pressure determinations based on Y2 are less accurate, especially at high temperature. At elevated temperature, the Sm:YAG Y1 and Y2 peak frequencies are most accurately determined by curve fitting a spectral window at least 400 cm-1 wide. The spectral range was chosen in order to include the decay of the intensity of the Lorentzian Y1 peak to a background value and incorporate a third peak at 16360 cm-1. C1 UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. RP HESS, NJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. OI Hess, Nancy/0000-0002-8930-9500 NR 10 TC 46 Z9 46 U1 1 U2 10 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 MAR 1 PY 1992 VL 71 IS 5 BP 2082 EP 2086 DI 10.1063/1.351158 PG 5 WC Physics, Applied SC Physics GA HF690 UT WOS:A1992HF69000002 ER PT J AU CHO, NH VEIRS, DK AGER, JW RUBIN, MD HOPPER, CB BOGY, DB AF CHO, NH VEIRS, DK AGER, JW RUBIN, MD HOPPER, CB BOGY, DB TI EFFECTS OF SUBSTRATE-TEMPERATURE ON CHEMICAL-STRUCTURE OF AMORPHOUS-CARBON FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; ENERGY-LOSS SPECTROSCOPY; RAMAN-SCATTERING; ATOMIC-STRUCTURE; GRAPHITE; DIAMOND; SURFACE; OVERCOATS; MEDIA AB Amorphous carbon thin films were prepared at 30, 200, and 450-degrees-C by magnetron sputtering of a graphite target. The surface structure and chemical bonding (sp2/sp3) of the carbon films were characterized by scanning tunneling microscopy (STM) and Raman spectroscopy. STM images show that graphite microcrystallites of 20-40 angstrom in size are present at the surfaces of all the films and the number of the microcrystallites increases with increasing substrate temperature. The microcrystallites often contain structural defects. Raman measurements show that increasing the substrate temperature results in an increase in the sp2-bonded fraction of carbon atoms and a decrease in the microstructural defects. These results indicate that the microstructural changes are correlated with changes in the chemical bonding ratio (sp3/sp3) and no diamond microcrystallites are present in the amorphous carbon. A three-dimensional atomic structure of the graphite microcrystallites is discussed in terms of turbostratic graphite. C1 UNIV CALIF BERKELEY,DEPT MECH ENGN,COMP MECH LAB,BERKELEY,CA 94720. RP CHO, NH (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. OI Ager, Joel/0000-0001-9334-9751 NR 33 TC 108 Z9 109 U1 3 U2 19 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 MAR 1 PY 1992 VL 71 IS 5 BP 2243 EP 2248 DI 10.1063/1.351122 PG 6 WC Physics, Applied SC Physics GA HF690 UT WOS:A1992HF69000023 ER PT J AU JOO, J SINGH, JP POEPPEL, RB GANGOPADHYAY, AK MASON, TO AF JOO, J SINGH, JP POEPPEL, RB GANGOPADHYAY, AK MASON, TO TI EFFECT OF SILVER SOLUBILITY ON MICROSTRUCTURE AND SUPERCONDUCTING PROPERTIES OF YBA2CU3-XAGXO7-DELTA SUPERCONDUCTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BA-CU-O; TC; SYSTEM; YBA2CU3O7-X; PEROVSKITE AB The effect of silver (Ag) solubility on microstructure and superconducting properties of YBa2Cu3-xAgxO7-delta (0 less-than-or-equal-to x less-than-or-equal-to 0.5) superconductors has been evaluated. The solubility limit of Ag for copper sites in YBCO at ambient conditions (room temperature, atmospheric pressure) was evaluated to be x congruent-to 0.06. Analysis revealed the Ag content (x) of YBCO grains to be lower than the nominal Ag content (x(n)) used for fabrication, probably due to processing-related problems. Part of the Ag used for fabrication segregates on the YBCO grain boundaries. The segregated Ag particles are believed to pin YBCO grains, resulting in fine-grain microstructures. For low nominal Ag content, x(n) < 0.2, critical current density (J(c)) increased from 98 to 160 A/cm2 as a function of increasing Ag content. These improvements are believed to be due to the increased oxygen content and associated microstructural changes in the YBCO. For higher nominal Ag content, x(n) > 0.2, however, J(c) decreased rapidly with the increasing Ag content due to the precipitation of nonsuperconducting phases. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RP JOO, J (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. RI Mason, Thomas/B-7528-2009 NR 29 TC 43 Z9 43 U1 1 U2 5 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 MAR 1 PY 1992 VL 71 IS 5 BP 2351 EP 2355 DI 10.1063/1.351088 PG 5 WC Physics, Applied SC Physics GA HF690 UT WOS:A1992HF69000040 ER PT J AU DIAZ, A PONS, ME LACKS, SA LOPEZ, P AF DIAZ, A PONS, ME LACKS, SA LOPEZ, P TI STREPTOCOCCUS-PNEUMONIAE DNA-POLYMERASE-I LACKS 3'-TO-5' EXONUCLEASE ACTIVITY - LOCALIZATION OF THE 5'-TO-3' EXONUCLEOLYTIC DOMAIN SO JOURNAL OF BACTERIOLOGY LA English DT Article ID POLYACRYLAMIDE GEL-ELECTROPHORESIS; COLI POLA GENE; ESCHERICHIA-COLI; BACILLUS-SUBTILIS; PLASMID DNA; DIPLOCOCCUS-PNEUMONIAE; THERMUS-AQUATICUS; KLENOW FRAGMENT; RNA-POLYMERASE; EXPRESSION AB The Streptococcus pneumoniae polA gene was altered at various positions by deletions and insertions. The polypeptides encoded by these mutant polA genes were identified in S. pneumoniae. Three of them were enzymatically active. One was a fused protein containing the first 11 amino acid residues of gene 10 from coliphage T7 and the carboxyl-terminal two-thirds of pneumococcal DNA polymerase I; it possessed only polymerase activity. The other two enzymatically active proteins, which contained 620 and 351 amino acid residues from the amino terminus, respectively, lacked polymerase activity and showed only exonuclease activity. These two polymerase-deficient proteins and the wild-type protein were hyperproduced in Escherichia coli and purified. In contrast to the DNA polymerase I of Escherichia coli but similar to the corresponding enzyme of Thermus aquaticus, the pneumococcal enzyme appeared to lack 3'-to-5' exonuclease activity. The 5'-to-3' exonuclease domain was located in the amino-terminal region of the wild-type pneumococcal protein. This exonuclease activity excised deoxyribonucleoside 5'-monophosphate from both double- and single-stranded DNAs. It degraded oligonucleotide substrates to a decameric final product. C1 CSIC,CTR INVEST BIOL,VELAZQUEZ 144,E-28006 MADRID,SPAIN. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Lopez Garcia, Paloma/L-1583-2014 OI Lopez Garcia, Paloma/0000-0001-8755-8952 FU NIAID NIH HHS [AI14885]; NIGMS NIH HHS [GM29721] NR 42 TC 16 Z9 16 U1 0 U2 1 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 MAR PY 1992 VL 174 IS 6 BP 2014 EP 2024 PG 11 WC Microbiology SC Microbiology GA HJ502 UT WOS:A1992HJ50200039 PM 1548239 ER PT J AU KIM, CM SOMORJAI, GA AF KIM, CM SOMORJAI, GA TI THE EFFECTS OF RHENIUM AND SULFUR ON THE REACTIVITY AND SELECTIVITY OF PT SINGLE-CRYSTAL CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID HYDROCARBON-CONVERSION CATALYSTS; CURRENT ION-SOURCE; SURFACES; PLATINUM; HYDROGENOLYSIS; AU-PT(111) C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP KIM, CM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 29 TC 28 Z9 29 U1 0 U2 4 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 MAR PY 1992 VL 134 IS 1 BP 179 EP 185 DI 10.1016/0021-9517(92)90220-C PG 7 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA HE421 UT WOS:A1992HE42100017 ER PT J AU MARTINSGREEN, M AOTAKIKEEN, A HJELMELAND, LM BISSELL, MJ AF MARTINSGREEN, M AOTAKIKEEN, A HJELMELAND, LM BISSELL, MJ TI THE 9E3 PROTEIN - IMMUNOLOCALIZATION INVIVO AND EVIDENCE FOR MULTIPLE FORMS IN CULTURE SO JOURNAL OF CELL SCIENCE LA English DT Article DE IMMUNOPRECIPITATION; 9E3-PROTEIN; GRO GENES; CYTOKINES ID GROWTH-STIMULATORY ACTIVITY; PLATELET PROTEIN; CELLS; GENE; EXPRESSION; INTERLEUKIN-8; FIBROBLASTS; TUMORS AB The avian gene 9E3/CEF4 belongs to a group of genes whose products are highly conserved and are homologous to inflammatory mediators. These genes, sometimes referred to as the gro family, are also expressed upon wounding or serum-stimulation of quiescent cells, suggesting that they may be important in aspects of growth and/or wound healing. We have used an antibody to the product of the 9E3 gene to show for the first time the distribution in vivo of the protein of one of these genes. The polyclonal antibody was produced against a synthetic peptide, [Cys76], 9E3, (77-103), located at the carboxy end of the molecule. The specificity of the antibody was determined by transfection of the 9E3 cDNA into Cos 7 cells, which do not express this gene. Moreover, despite the high homology between 9E3 and IL-8, the antibody did not crossreact with this molecule. The antibody was used to immunoprecipitate the protein from cultured normal and RSV-transformed chick embryo fibroblasts (CEFs) and to determine its distribution in tissues of newly hatched chicks. The staining was abundant in the cells and extracellular matrix (ECM) of connective tissue and other tissues of mesenchymal origin, such as bone and tendon. Most cells in the granulation tissue of wounds stained, some more intensely than others; the ECM also stained, expecially in areas of scar tissue where collagen is abundant. In RSV-induced tumors, the protein was absent except in necrotic areas where a few cells - potentially macrophages - stained. In general, as expected, the protein was present in the cells and tissues that expressed the mRNA, but there were exceptions. In the smooth muscle layer of arteries and the epidermis of the skin, where the levels of mRNA were too low to be detected by in situ hybridization with a radioactivity labeled probe, the protein was present. The antibody immunoprecipated a 14 kDa molecule from the cell extracts of normal and transformed CEFs, and two forms (9 kDa and 6 kDa) from the supernatant of RSV-transformed CEFs. The results presented here suggest that this protein could play a role in tissue remodeling and wound healing. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT OPHTHALMOL,DAVIS,CA 95616. FU NEI NIH HHS [EYO 6473, R01 EY006473-10, R01 EY006473] NR 30 TC 17 Z9 18 U1 0 U2 0 PU COMPANY OF BIOLOGISTS LTD PI CAMBRIDGE PA BIDDER BUILDING CAMBRIDGE COMMERCIAL PARK COWLEY RD, CAMBRIDGE, CAMBS, ENGLAND CB4 4DL SN 0021-9533 J9 J CELL SCI JI J. Cell Sci. PD MAR PY 1992 VL 101 BP 701 EP 707 PN 3 PG 7 WC Cell Biology SC Cell Biology GA HM872 UT WOS:A1992HM87200021 PM 1325984 ER PT J AU CHANG, J BROWN, NJ DMELLO, M WYATT, RE RABITZ, H AF CHANG, J BROWN, NJ DMELLO, M WYATT, RE RABITZ, H TI QUANTUM FUNCTIONAL SENSITIVITY ANALYSIS FOR THE COLLINEAR H+H-2 REACTION-RATE COEFFICIENT SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID KOHN VARIATIONAL PRINCIPLE; MECHANICAL REACTION PROBABILITIES; POTENTIAL-ENERGY SURFACE; INTEGRAL CROSS-SECTIONS; TRANSITION-STATE THEORY; LOG DERIVATIVE VERSION; S-MATRIX VERSION; 3 DIMENSIONS; H2 REACTION; SCATTERING AB The effects of features in the potential energy surface on the collinear H + H-2 reaction rate coefficient are investigated by the method of quantum functional sensitivity analysis (QFSA). The calculations use QFSA to connect features in the microscopic realm, with their response upon macroscopic quantities of chemical interest, via the intermediary sensitivities of the reactive transition probabilities. While the sensitivities of the individual transition probabilities show considerable structure, there is an attendant loss of structure in the rate coefficient sensitivities because of the thermal averaging. For the range of temperatures used in our study (200-2400 K), the most important region of the potential energy surface is found to be not at the top of the barrier, but rather at the lower energy shoulders of the barrier. There are also regions near the barrier where an increase in the potential surface actually increases the reaction rate! The effects of using different underlying potentials [the Porter-Karplus (PK2), Liu-Siegbahn-Truhlar-Horowitz (LSTH), and double many-body expansion (DMBE) surfaces] on the nature of the results were also compared. The absolute sensitivity magnitudes on the PK2 surface vary considerably from the other two, but the relative change in the rate coefficient is about the same on all three surfaces. Furthermore, the identified regions of importance on the potential surfaces remain essentially the same. The reactive scattering calculations were performed with the log-derivative version of the Kohn variational principle. C1 UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. UNIV TEXAS,INST THEORET CHEM,AUSTIN,TX 78712. PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544. RP CHANG, J (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720, USA. NR 49 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 1 PY 1992 VL 96 IS 5 BP 3523 EP 3530 DI 10.1063/1.461906 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HG953 UT WOS:A1992HG95300020 ER PT J AU TONKYN, RG WIEDMANN, RT WHITE, MG AF TONKYN, RG WIEDMANN, RT WHITE, MG TI ANOMALOUS BRANCH INTENSITIES IN THE THRESHOLD PHOTOIONIZATION OF HCL SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID INDUCED ROTATIONAL AUTOIONIZATION; PHOTOELECTRON-SPECTROSCOPY; IONIZATION-ENERGY; DEPENDENCE; RULES; FIELD; HBR+ AB The rotationally resolved threshold photoionization spectrum of HCl has been observed for ionization into both spin-orbit components of the ground electronic state of HCl+. The data indicate an extreme asymmetry in the apportioning of angular momentum between the escaping photoelectron and the ion core. Observed transitions in which the core rotation decreases are found to be heavily favored compared to those where the core rotation increases by an equal amount. A mechanism of increased negative branch intensity due to field- or dipole-induced mixing of Rydberg series converging to higher ion rotational levels is proposed as a possible explanation. Direct observation of the transition HCl (X (1)SIGMA+,J" = 0) --> HCl+ (X approximately (2)PI(3/2),J+ = 3/2) yields an ionization potential of 102 802.8 +/- 2 cm-1 for HCl. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 32 TC 54 Z9 54 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 MAR 1 PY 1992 VL 96 IS 5 BP 3696 EP 3701 DI 10.1063/1.461923 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HG953 UT WOS:A1992HG95300039 ER PT J AU MARINO, MM ERMLER, WC KERN, CW BONDYBEY, VE AF MARINO, MM ERMLER, WC KERN, CW BONDYBEY, VE TI SPIN-ORBIT CONFIGURATION-INTERACTION STUDY OF VALENCE AND RYDBERG STATES OF LIBE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EFFECTIVE CORE POTENTIALS; MOLECULES; SPECTRUM AB Ab initio spin-orbit full configuration-interaction calculations in the context of relativistic effective core potentials are reported for the weakly bound metal dimer LiBe, a three-valence-electron system. The effects of basis set on the energies of valence and Rydberg states of the cluster are discussed, as are the effects of configuration space selection on the energy of the latter states. Results at the dissociative limit are compared to the experimental atomic spectra. Potential-energy curves and spectroscopic constants are presented for the ground state and fourteen excited states, which includes the Li and Be 2p valence states, the Li 3s, 3p, 3d, and 4s Rydberg states, as well as three low-lying states of the molecular cation. C1 TECH UNIV MUNICH, INST PHYS CHEM, W-8046 GARCHING, GERMANY. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP MARINO, MM (reprint author), OHIO STATE UNIV, DEPT CHEM, COLUMBUS, OH 43210 USA. RI Ermler, Walter/B-6876-2011 NR 23 TC 13 Z9 13 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 MAR 1 PY 1992 VL 96 IS 5 BP 3756 EP 3766 DI 10.1063/1.461880 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HG953 UT WOS:A1992HG95300048 ER PT J AU DANG, LX PETTITT, BM ROSSKY, PJ AF DANG, LX PETTITT, BM ROSSKY, PJ TI ON THE CORRELATION BETWEEN LIKE ION-PAIRS IN WATER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID MOLECULAR-DYNAMICS; MEAN FORCE; SPHERE C1 UNIV HOUSTON, DEPT CHEM, HOUSTON, TX 77204 USA. UNIV TEXAS, DEPT CHEM, AUSTIN, TX 78712 USA. RP DANG, LX (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 24 TC 71 Z9 71 U1 0 U2 7 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 MAR 1 PY 1992 VL 96 IS 5 BP 4046 EP 4047 DI 10.1063/1.461859 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HG953 UT WOS:A1992HG95300081 ER PT J AU HOLMES, HF MESMER, RE AF HOLMES, HF MESMER, RE TI ISOPIESTIC STUDIES OF H2SO4(AQ) AT ELEVATED-TEMPERATURES - THERMODYNAMIC PROPERTIES SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID SODIUM-CHLORIDE SOLUTIONS; AQUEOUS-SOLUTIONS; SULFURIC-ACID; DISSOCIATION-CONSTANT; OSMOTIC COEFFICIENTS; 250-DEGREES-C; ELECTROLYTES; KCL RP HOLMES, HF (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 23 TC 25 Z9 26 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD MAR PY 1992 VL 24 IS 3 BP 317 EP 328 DI 10.1016/S0021-9614(05)80072-2 PG 12 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA HG538 UT WOS:A1992HG53800009 ER PT J AU DUKOWICZ, JK MELTZ, BJA AF DUKOWICZ, JK MELTZ, BJA TI VORTICITY ERRORS IN MULTIDIMENSIONAL LAGRANGIAN CODES SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FLUID C1 CTR ETUD LIMEIL VALENTON,DEPT MATH APPL,F-94195 VILLENEUVE ST GEO,FRANCE. RP DUKOWICZ, JK (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,GRP T3,LOS ALAMOS,NM 87545, USA. NR 13 TC 87 Z9 94 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD MAR PY 1992 VL 99 IS 1 BP 115 EP 134 DI 10.1016/0021-9991(92)90280-C PG 20 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA HK014 UT WOS:A1992HK01400011 ER PT J AU CANFIELD, EH VIECELLI, JA AF CANFIELD, EH VIECELLI, JA TI RANDOM-ACCESS TO A RANDOM NUMBER SEQUENCE SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Note RP CANFIELD, EH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD MAR PY 1992 VL 99 IS 1 BP 176 EP 178 DI 10.1016/0021-9991(92)90285-7 PG 3 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA HK014 UT WOS:A1992HK01400016 ER PT J AU LENHARD, RJ AF LENHARD, RJ TI MEASUREMENT AND MODELING OF 3-PHASE SATURATION PRESSURE HYSTERESIS SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID GOVERNING MULTIPHASE FLOW; SOILS AB A published hysteretic saturation-pressure (S-P) model, which predicts fluid distributions before and after subsurface contamination by a nonaqueous phase liquid (NAPL), is tested. To accomplish this, two-phase air-water and three-phase air-NAPL-water S-P measurements are conducted in two dissimilar porous media using a specially designed apparatus. Experimental boundary conditions are imposed to investigate hysteretic S-P scanning path behavior. Analysis of the data shows that fluid contents are not a unique function of capillary pressures; they are also a function of saturation path history (i.e. history-dependent movement of fluid interfaces through porous media). Close agreement is found between the experimental measurements and those calculated when the model was calibrated to the data. These results suggest that employing nonhysteretic S-P relations in computer codes to predict subsurface fluid distributions are likely to be inaccurate. In this paper the first version of the S-P model and a later amendment are outlined and consolidated. RP LENHARD, RJ (reprint author), PACIFIC NW LAB, POB 999,BATTELLE BLVD, RICHLAND, WA 99352 USA. NR 22 TC 62 Z9 62 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD MAR PY 1992 VL 9 IS 3 BP 243 EP 269 DI 10.1016/0169-7722(92)90007-2 PG 27 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA HP814 UT WOS:A1992HP81400002 ER PT J AU TORAN, L PALUMBO, AV AF TORAN, L PALUMBO, AV TI COLLOID TRANSPORT THROUGH FRACTURED AND UNFRACTURED LABORATORY SAND COLUMNS SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID POROUS-MEDIA; BACTERIAL TRANSPORT; PARTICLE-TRANSPORT; ESCHERICHIA-COLI; SOIL COLUMNS; MICROORGANISMS; MICROSPHERES; GROUNDWATER; MOVEMENT; ROCK AB We examined the effects of artificial fractures on colloidal transport in laboratory sand columns. Fractures were simulated by inserting small (0.2- or 1-mm-diam) tubes of controlled length and density into a sand column with dimensions 5-cm-diam by 65-cm-length. We injected 1-mu-m-diam fluorescent microspheres, bacteria, and colloidal organic matter into columns with tubes and columns without tubes. Breakthrough curves were analyzed using an equilibrium transport model to obtain values for percent retention, retardation, and dispersivity. Fractures significantly increased the amount of microsphere transport; 80-99% of the spheres were retained in experiments with tubes inserted compared to 99-100% without tubes. Bacteria used in this particular experiment had a lower percent retention (increased transport), 73% with tubes and 93% retention without tubes. Colloidal organic matter had 34% retention with tubes and 55% retention without tubes. Microspheres travelled faster than a conservative salt tracer (retardation factor < 1), probably caused by exclusion of travel at slower velocities in the matrix. This effect was enhanced when tubes were present. In some experiments, the tubes created multiple flow paths manifest in irregular rather than smooth breakthrough curves. There was no measurable difference in dispersion for the "fractured" versus the "unfractured" system. The retention coefficient was determined by sectioning the column at the end of the experiment and counting the number of microspheres retained in sections along the column. The exponential retention rate for spheres was on the order of 0.1 cm-1, with no measurable variation between sand columns with and without tubes. This retention coefficient is needed for models to predict colloid transport. In addition to providing parameter values for models, these observations have implications for monitoring colloid transport in natural systems. It is necessary to consider the possibility of travel faster than a conservative tracer, irregular breakthrough curves, and irreversible retention when sampling for colloids. RP TORAN, L (reprint author), US DOE,OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Palumbo, Anthony/A-4764-2011 OI Palumbo, Anthony/0000-0002-1102-3975 NR 32 TC 67 Z9 68 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD MAR PY 1992 VL 9 IS 3 BP 289 EP 303 DI 10.1016/0169-7722(92)90009-4 PG 15 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA HP814 UT WOS:A1992HP81400004 ER PT J AU KRAUSE, MO WHITFIELD, SB CALDWELL, CD WU, JZ VANDERMEULEN, P DELANGE, CA HANSEN, RWC AF KRAUSE, MO WHITFIELD, SB CALDWELL, CD WU, JZ VANDERMEULEN, P DELANGE, CA HANSEN, RWC TI OUTER NS,NP CORRELATION SATELLITES IN THE RARE-GASES - A PHOTOELECTRON SPECTROMETRY STUDY WITH AN UNDULATOR PHOTON SOURCE SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID PHOTOIONIZATION CROSS-SECTION; SYNCHROTRON RADIATION; ANGULAR-DISTRIBUTION; VALENCE SATELLITES; HIGH-RESOLUTION; ARGON; SPECTRUM; THRESHOLD; XENON; NEON AB High-resolution photoelectron spectra of the outer ns,np correlation satellites of neon, argon, krypton and xenon are presented for low excitation energies of about 65 eV. Relative cross-sections and photoelectron angular distribution parameters are given, and differential cross-sections at angles parallel and perpendicular to the polarization vector are included for comparison. Energy dependence of satellite features are given for neon and argon in the range 55 less-than-or-equal-to h-nu less-than-or-equal-to 130 eV. Results generally confirm the predictions taken from the latest theoretical interpretations, and conclusions drawn from lower-resolution data. Finally, undulator beam line characteristics have been determined and are described in some detail. C1 UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816. UNIV AMSTERDAM,PHYS CHEM LAB,1018 WS AMSTERDAM,NETHERLANDS. UNIV WISCONSIN,CTR SYNCHROTRON,STOUGHTON,WI 53589. RP KRAUSE, MO (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 59 TC 65 Z9 65 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD MAR PY 1992 VL 58 IS 1-2 BP 79 EP 104 DI 10.1016/0368-2048(92)80009-W PG 26 WC Spectroscopy SC Spectroscopy GA HJ617 UT WOS:A1992HJ61700009 ER PT J AU VERNON, SM TOBIN, SP SANFACON, MM MASTROVITO, AL KARAM, NH ALJASSIM, MM AF VERNON, SM TOBIN, SP SANFACON, MM MASTROVITO, AL KARAM, NH ALJASSIM, MM TI GROWTH AND CHARACTERIZATION OF ALXGA1-XAS BRAGG REFLECTORS BY LP-MOCVD SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE BRAGG REFLECTOR; ALGAAS; SOLAR CELL; SILICON SUBSTRATE ID CHEMICAL VAPOR-DEPOSITION; QUANTUM-WELL; ALGAAS-GAAS; REFLECTIVITY; SUPERLATTICES; MIRRORS; EPITAXY; LASERS; SI AB Using a moderate-sized LP-MOCVD production reactor, we have demonstrated the growth of Bragg reflector structures that reflect nearly 100% of the light at the design wave-length of 850 nm. The designs studied consist of alternating layers of Al0.10Ga0.90As and Al0.85Ga0.15As, with up to 30 periods. Characterization data show the structures to be highly reproducible and uniform, with good agreement between data obtained by double-crystal x-ray rocking curve analysis, cross-sectional transmission electron microscopy, and optical-reflectance spectroscopy. GaAs solar cells utilizing Bragg reflectors have been fabricated and characterized. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP VERNON, SM (reprint author), SPIRE CORP,BEDFORD,MA 01730, USA. NR 18 TC 4 Z9 4 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD MAR PY 1992 VL 21 IS 3 BP 335 EP 340 DI 10.1007/BF02660463 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA HJ059 UT WOS:A1992HJ05900015 ER PT J AU DOSS, ED ROY, GD AF DOSS, ED ROY, GD TI FLOW DEVELOPMENT AND ANALYSIS OF MHD GENERATORS AND SEAWATER THRUSTERS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID 3-DIMENSIONAL FLOW AB The flow characteristics inside magnetohydrodynamic (MHD) plasma generators and seawater thrusters are analyzed and are compared using a three-dimensional computer model that solves the governing partial differential equations for fluid flow and electrical fields. Calculations have been performed for a Faraday plasma generator and for a continuous electrode seawater thruster. The results of the calculations show that the effects caused by the interaction of the MHD forces with the fluid flow are strongly manifested in the case of the MHD generator as compared to the flow development in the MHD thruster. The existence of velocity overshoots over the sidewalls confirm previously published results for MHD generators with strong MHD interaction. For MHD thrusters, the velocity profile is found to be slightly flatter over the sidewall as compared to that over the electrode wall. As a result, distinct enhancement of the skin friction exists over the sidewalls of MHD generators in comparison to that of MHD thrusters. Plots of velocity profiles and skin friction distributions are presented to illustrate and compare the flow development in MHD generators and thrusters. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP DOSS, ED (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 14 TC 2 Z9 2 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD MAR PY 1992 VL 114 IS 1 BP 68 EP 72 DI 10.1115/1.2910002 PG 5 WC Engineering, Mechanical SC Engineering GA HP713 UT WOS:A1992HP71300011 ER PT J AU DRISCOLL, DI SCHMITT, RL STEVENSON, WH AF DRISCOLL, DI SCHMITT, RL STEVENSON, WH TI THIN FLOWING LIQUID-FILM THICKNESS MEASUREMENT BY LASER-INDUCED FLUORESCENCE SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB An optical technique is described for determining, in a physically nondisturbing manner, the thickness of a thin flowing liquid film. The technique is based on measurement of the fluorescent emission induced in the liquid film by absorption of a focused laser beam. Although the technique was developed for measuring liquid film thicknesses on the prefilming surface of an airblast fuel atomizer, it is not limited to this application. C1 SANDIA NATL LABS,COMBUST RES FAC,TECH STAFF,LIVERMORE,CA 94550. RP DRISCOLL, DI (reprint author), PURDUE UNIV,SCH MECH ENGN,W LAFAYETTE,IN 47907, USA. NR 11 TC 12 Z9 13 U1 0 U2 4 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD MAR PY 1992 VL 114 IS 1 BP 107 EP 112 DI 10.1115/1.2909984 PG 6 WC Engineering, Mechanical SC Engineering GA HP713 UT WOS:A1992HP71300017 ER PT J AU LE, G RUSSELL, CT THOMSEN, MF GOSLING, JT AF LE, G RUSSELL, CT THOMSEN, MF GOSLING, JT TI OBSERVATIONS OF A NEW CLASS OF UPSTREAM WAVES WITH PERIODS NEAR 3 SECONDS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID BOW SHOCK; SOLAR-WIND; HYDROMAGNETIC-WAVES; ISEE-2 OBSERVATIONS; POPULATIONS; ASSOCIATION; IONS AB We have found a new class of ULF waves with periods near 3 s in the Earth's upstream region by examining the high time resolution magnetic field data from the ISEE spacecraft. These waves are observed in the part of the upstream region which is magnetically connected to the bow shock, but only when the solar wind plasma beta is high (greater than 1). The waves are always right-handed, nearly circularly polarized in the spacecraft frame. The directions of the wave vectors are in the general direction of the average magnetic field, and the waves are convected downstream in the spacecraft frame. Our study of these waves has shown that they appear to be intrinsically left-handed ion cyclotron waves in the plasma rest frame. C1 UNIV CALIF,LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87543. UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. RP LE, G (reprint author), UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024, USA. RI Le, Guan/C-9524-2012 OI Le, Guan/0000-0002-9504-5214 NR 21 TC 25 Z9 26 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD MAR 1 PY 1992 VL 97 IS A3 BP 2917 EP 2925 DI 10.1029/91JA02707 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HG749 UT WOS:A1992HG74900008 ER PT J AU GARY, SP WINSKE, D AF GARY, SP WINSKE, D TI CORRELATION-FUNCTION RATIOS AND THE IDENTIFICATION OF SPACE PLASMA INSTABILITIES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ION-BEAM INSTABILITIES; SLOW-MODE SHOCKS; EARTHS BOW SHOCK; LOW-FREQUENCY; MIRROR WAVES; LOW-BETA; TURBULENCE; UPSTREAM; MAGNETOSHEATH; FLUCTUATIONS AB Wave-particle transport in a collisionless plasma is due to particle scattering by enhanced fluctuations associated with the growth of instabilities. In particular, relatively short wave-length kinetic instabilities are frequently invoked to explain many different types of plasma transport in space. Although there is an extensive theoretical and simulation literature describing the potential applications of many such instabilities, there are only a few cases of clear-cut identification of kinetic modes in space. The research described in this paper uses linear Vlasov dispersion theory to study correlation functions and dimensionless correlation function ratios for fluctuations or instabilities in three space plasma regimes. This research shows that both the compressibility and the parallel compressibility are likely to be useful in distinguishing modes in the magnetosheath as well as in the plasma sheet boundary layer and that helicity remains a useful identifier of electromagnetic ion/ion instabilities in the foreshock. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. RP GARY, SP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV SPACE SCI & TECHNOL,MAIL STOP D438,LOS ALAMOS,NM 87545, USA. NR 39 TC 48 Z9 49 U1 0 U2 3 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 MAR 1 PY 1992 VL 97 IS A3 BP 3103 EP 3111 DI 10.1029/91JA02752 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HG749 UT WOS:A1992HG74900023 ER PT J AU SCHULZEBERGE, S COWLEY, S CHEN, L AF SCHULZEBERGE, S COWLEY, S CHEN, L TI THEORY OF FIELD LINE RESONANCES OF STANDING SHEAR ALFVEN WAVES IN 3-DIMENSIONAL INHOMOGENEOUS PLASMAS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PULSATIONS AB We have analyzed field line resonances of Alfven waves in a rectangular box model with a straight uniform magnetic field but three-dimensionally varying density. Field line resonances are shown to exist even with this three-dimensional nonuniformity. For a given wave frequency we can construct the surface on which the resonance occurs and derive the local form of the singular solution. Magnetic perturbations are found to lie predominantly in the resonant surface. In the presence of azimuthal inhomogeneities the present theory could explain why some satellite measurements show geomagnetic pulsations of comparable magnitude in radial and azimuthal components. C1 PRINCETON UNIV,DEPT ASTROPHYS SCI,PRINCETON,NJ 08543. RP SCHULZEBERGE, S (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,JAMES FORRESTAL CAMPUS,POB 451,PRINCETON,NJ 08543, USA. RI chen, liu/I-2297-2013 NR 5 TC 9 Z9 9 U1 0 U2 1 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 MAR 1 PY 1992 VL 97 IS A3 BP 3219 EP 3222 DI 10.1029/91JA02804 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HG749 UT WOS:A1992HG74900034 ER PT J AU METWALLY, SAM GATLEY, SJ WOLF, AP YU, DW AF METWALLY, SAM GATLEY, SJ WOLF, AP YU, DW TI SYNTHESIS AND BINDING TO STRIATAL MEMBRANES OF NO CARRIER ADDED I-123 LABELED 4'-IODOCOCAINE SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE COCAINE; DOPAMINE; RADIOIODINATION; IODODESTANNYLATION; 4'-[I-123]IODOCOCAINE ID COCAINE BINDING; DOPAMINE; RECEPTORS; TRANSPORTERS; SITES; BRAIN AB An I-123 labeled cocaine analog, 4'-[I-123]iodococaine, has been prepared by oxidative destannylation of the tributyltin analog and shown to interact with cocaine binding sites in rat brain striatal membranes. It may thus be a suitable SPECT radiotracer for studies of the dopamine reuptake site in neurodegenerative diseases. RP METWALLY, SAM (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0362-4803 J9 J LABELLED COMPD RAD JI J. Label. Compd. Radiopharm. PD MAR PY 1992 VL 31 IS 3 BP 219 EP 225 DI 10.1002/jlcr.2580310307 PG 7 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical; Pharmacology & Pharmacy SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA HH065 UT WOS:A1992HH06500006 ER PT J AU KAGAN, VE SERBINOVA, EA FORTE, T SCITA, G PACKER, L AF KAGAN, VE SERBINOVA, EA FORTE, T SCITA, G PACKER, L TI RECYCLING OF VITAMIN-E IN HUMAN LOW-DENSITY LIPOPROTEINS SO JOURNAL OF LIPID RESEARCH LA English DT Article DE TOCOPHEROL; TOCOTRIENOL; CHROMANOXYL RADICAL; LIPOXYGENASE; UV IRRADIATION; ASCORBATE; DIHYDROLIPOIC ACID; BETA-CAROTENE ID MICROSOMAL LIPID-PEROXIDATION; UNSATURATED FATTY-ACIDS; ELECTRON-SPIN-RESONANCE; OXIDATIVE MODIFICATION; ANTIOXIDANT ACTIVITY; ALPHA-TOCOPHEROL; LIPOIC ACID; LIPOXYGENASE; ASCORBATE; CELL AB Oxidative modification of low density lipoproteins (LDL) and their unrestricted scavenger receptor-dependent uptake is believed to account for cholesterol deposition in macrophage-derived foam cells. It has been suggested that vitamin E that is transported by LDL plays a critical role in protecting against LDL oxidation. We hypothesize that the maintenance of sufficiently high vitamin E concentrations in LDL can be achieved by reducing its chromanoxyl radicals, i.e., by vitamin E recycling. In this study we demonstrate that: i) chromanoxyl radicals of endogenous vitamin E and of exogenously added alpha-tocotrienol, alpha-tocopherol or its synthetic homologue with a 6-carbon side-chain, chromanol-alpha-C6, can be directly generated in human LDL by ultraviolet (UV) light, or by interaction with peroxyl radicals produced either by an enzymic oxidation system (lipoxygenase + linolenic acid) or by an azo-initiator, 2,2'-azo-bis(2,4-dimethylvaleronitrile) (AMVN); ii) ascorbate can recycle endogenous vitamin E and exogenously added chromanols by direct reduction of chromanoxyl radicals in LDL; iii) dihydrolipoic acid is not efficient in direct reduction of chromanoxyl radicals but recycles vitamin E by synergistically interacting with ascorbate (reduces dehydroascorbate thus maintaining the steady-state concentration of ascorbate); and iv) beta-carotene is not active in vitamin E recycling but may itself be protected against oxidative destruction by the reductants of chromanoxyl radicals. We suggest that the recycling of vitamin E and other phenolic antioxidants by plasma reductants may be an important mechanism for the enhanced antioxidant protection of LDL. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT NUTR,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. RP KAGAN, VE (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT MOLEC & CELL BIOL,251 LSA,BERKELEY,CA 94720, USA. RI Scita, GIORGIO/J-9670-2012; OI Scita, Giorgio/0000-0001-7984-1889 FU NCI NIH HHS [CA-47597]; NHLBI NIH HHS [HL-18574] NR 52 TC 258 Z9 260 U1 2 U2 4 PU LIPID RESEARCH INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0022-2275 J9 J LIPID RES JI J. Lipid Res. PD MAR PY 1992 VL 33 IS 3 BP 385 EP 397 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HK057 UT WOS:A1992HK05700010 PM 1314881 ER PT J AU BOYD, STP SWIFT, GW AF BOYD, STP SWIFT, GW TI FAST GROWTH OF HE-3-B INTO SUPERCOOLED HE-3-A SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID SUPERFLUID HE-3; HYPERCOOLED HE-3-A; PHASE; CURRENTS AB We report results of an investigation of the growth of He-3-B into supercooled, magnetized He-3-A. The B-phase growth was observed magnetically, with the difference between A- and B-phase susceptibilities generating signals in SQUID magnetometers. The form of the magnetization signal associated with the moving interface evolved radically with increased supercooling, indicating that the rapidly moving interface is no longer a simple boundary between equilibrium B phase and metastable equilibrated A phase. Magnetization changes were observed to travel through the superfluid as fast as 800 cm/s. Several features of the measurements can be explained by a model based on magnetization transport by a critical-velocity-limited spin supercurrent. Other features of the data remain unexplained. C1 UNIV CALIF LOS ALAMOS SCI LAB,CONDENSED MATTER & THERMAL PHYS GRP,LOS ALAMOS,NM 87544. NR 26 TC 12 Z9 12 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD MAR PY 1992 VL 86 IS 5-6 BP 325 EP 347 DI 10.1007/BF00121502 PG 23 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HK694 UT WOS:A1992HK69400003 ER PT J AU SHINN, MD TESAR, AA AF SHINN, MD TESAR, AA TI OBSERVATION OF TEMPERATURE-DEPENDENT CR-3+ ND-3+ SENSITIZATION IN FLUORIDE GLASSES SO JOURNAL OF LUMINESCENCE LA English DT Article ID TRANSITION-METAL IONS; OPTICAL-PROPERTIES; CHROMIUM III; LASER AB Absorption and excitation spectra of two fluoride glasses doped with Cr3+ and Nd3+ ions were used to determine the Cr-Nd sensitization efficiency. The efficiency was found to be strongly temperature dependent, with a room temperature value of zero. A nonradiative mechanism based on changes in the local environment, which occurs when the Cr3+ ions is in the excited state, is suggested to be the cause of the low efficiency. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 24 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD MAR PY 1992 VL 51 IS 4 BP 189 EP 195 DI 10.1016/0022-2313(92)90053-C PG 7 WC Optics SC Optics GA HL787 UT WOS:A1992HL78700005 ER PT J AU MATTSON, JE BADER, SD BRODSKY, MB KETTERSON, JB AF MATTSON, JE BADER, SD BRODSKY, MB KETTERSON, JB TI ENHANCED MAGNETORESISTANCE BELOW THE SPIN-FLIP TRANSITION OF CR(001) THIN-FILMS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID MULTILAYERS; CHROMIUM AB Magnetoresistance measurements are used to identify the spin-flip transition temperature T(sf) in 500 and 3000 angstrom thick Cr(001) films grown epitaxially on LiF(001). T(sf) is suppressed to a lower temperature in the 500 angstrom film compared to the bulk value of 123 K. The shift in T(sf) with film thickness follows a similar stress dependence as that reported previously for bulk Cr crystals. The magnetoresistance is 50% at 4.2 K in a field of 5 T and still shows no sign of approaching saturation. C1 NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60201. RP MATTSON, JE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Ketterson, John/B-7234-2009; Bader, Samuel/A-2995-2013 NR 32 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD MAR PY 1992 VL 109 IS 2-3 BP 179 EP 184 DI 10.1016/0304-8853(92)91747-H PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HP060 UT WOS:A1992HP06000009 ER PT J AU MALIK, SK TANG, J GSCHNEIDNER, KA AF MALIK, SK TANG, J GSCHNEIDNER, KA TI CRYSTALLINE ELECTRIC-FIELD EFFECTS IN CECD11 AND PRCD11 SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID MAGNETIC-PROPERTIES AB A simultaneous analysis of the low temperature heat capacity, electrical resistivity and magnetic susceptibility of CeCd11 has been carried out on the basis of crystalline electric fields (CEF) acting on the Ce3+ ion. The ground multiplet level (F-2(5/2)) of the Ce3+ ion splits into three doublets under the influence of a CEF of tetragonal symmetry. Detailed analysis yields an overall splitting of almost-equal-to 70 K with the intermediate doublet lying at an energy separation of almost-equal-to 16 K from the ground doublet. Two sets of CEF parameters are obtained from this analysis which equally fit all the experimental observations in the low temperature range investigated. Experimental results on the heat capacity and magnetic susceptibility of PrCd11 are also presented and analyzed in the same manner using CEF parameters derived from those of CeCd11. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CARDIOTHORAC SURG,AMES,IA 50011. RP MALIK, SK (reprint author), TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. NR 9 TC 4 Z9 4 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD MAR PY 1992 VL 109 IS 2-3 BP 316 EP 322 DI 10.1016/0304-8853(92)91768-O PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HP060 UT WOS:A1992HP06000030 ER PT J AU WU, XD LUO, L MUENCHAUSEN, RE FOLTYN, SR AF WU, XD LUO, L MUENCHAUSEN, RE FOLTYN, SR TI THERMAL REGROWTH OF ION-DAMAGED YBA2CU3O7-DELTA SUPERCONDUCTING THIN-FILMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Note AB Regrowth of ion-damaged YBa2Cu3O7-delta thin films on LaAlO3 was studied using the ion beam channeling technique. The damaged films can be regrown at a temperature as low as 650-degrees-C, and are stable up to 1000-degrees-C. The regrowth process was found to be thermally activated with a single activation energy of 0.46 eV, contrary to two energies found in a previous study on the films on MgO [J. A. Martinez et al, Appl. Phys. Lett. 57, 189 (1990)]. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP WU, XD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. NR 5 TC 4 Z9 4 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 MAR PY 1992 VL 7 IS 3 BP 531 EP 534 DI 10.1557/JMR.1992.0531 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA HH520 UT WOS:A1992HH52000001 ER PT J AU GILMAN, JJ AF GILMAN, JJ TI INSULATOR-METAL TRANSITIONS AT MICROINDENTATIONS SO JOURNAL OF MATERIALS RESEARCH LA English DT Note ID PRESSURE AB For all tetrahedrally bonded semiconductors (five group IV plus nine III-V compounds and nine II-VI compounds), it is shown that the critical pressure needed to transform the semiconductor into the metallic state correlates with the microindentation hardness number. The same is done for five alkaline earth oxides. The critical transition pressures have been estimated from Herzfeld's theory - that is, from the compression at which the dielectric constant diverges to infinity. Experimental transition pressures also correlate with hardness numbers, and they correlate with the activation energies for dislocation motion. Since these transitions are electronic they can be influenced by photons, doping (donors enhance while acceptors inhibit them), currents, surface states, etc. Microindentation also provides a simple experimental tool for observing pressure and/or shear induced transformations. RP GILMAN, JJ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 12 TC 67 Z9 68 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 MAR PY 1992 VL 7 IS 3 BP 535 EP 538 DI 10.1557/JMR.1992.0535 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA HH520 UT WOS:A1992HH52000002 ER PT J AU HEIDELBACH, F WENK, HR MUENCHAUSEN, RE FOLTYN, S NOGAR, N ROLLETT, AD AF HEIDELBACH, F WENK, HR MUENCHAUSEN, RE FOLTYN, S NOGAR, N ROLLETT, AD TI TEXTURES OF LASER ABLATED SUPERCONDUCTING THIN-FILMS OF YBA2CU3O7-DELTA AS A FUNCTION OF DEPOSITION TEMPERATURE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB The preferred orientation of a series of laser deposited superconducting thin films of YBa2Cu3O7-delta on LaAlO3 substrate has been examined. X-ray measurements (pole figures, chi-scans, omega-scans, rocking curves) reveal an increasingly strong preferred orientation of the polycrystalline material with c-axes perpendicular to the substrate surface as deposition temperature increases. At low temperatures c-axes are predominantly parallel to the substrate surface. Characteristic parameters of the texture types were derived from those measurements. With higher temperatures twinning on (110) was observed. The different texture types are interpreted in terms of a layered film structure. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP HEIDELBACH, F (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 16 TC 15 Z9 15 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 MAR PY 1992 VL 7 IS 3 BP 549 EP 557 DI 10.1557/JMR.1992.0549 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA HH520 UT WOS:A1992HH52000006 ER PT J AU PHARR, GM OLIVER, WC BROTZEN, FR AF PHARR, GM OLIVER, WC BROTZEN, FR TI ON THE GENERALITY OF THE RELATIONSHIP AMONG CONTACT STIFFNESS, CONTACT AREA, AND ELASTIC-MODULUS DURING INDENTATION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID HARDNESS AB Results of Sneddon's analysis for the elastic contact between a rigid, axisymmetric punch and an elastic half space are used to show that a simple relationship exists among the contact stiffness, the contact area, and the elastic modulus that is not dependent on the geometry of the punch. The generality of the relationship has important implications for the measurement of mechanical properties using load and depth sensing indentation techniques and in the measurement of small contact areas such as those encountered in atomic force microscopy. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP PHARR, GM (reprint author), RICE UNIV,DEPT MAT SCI,POB 1982,HOUSTON,TX 77251, USA. NR 15 TC 876 Z9 910 U1 11 U2 158 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 MAR PY 1992 VL 7 IS 3 BP 613 EP 617 DI 10.1557/JMR.1992.0613 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA HH520 UT WOS:A1992HH52000014 ER PT J AU RANKIN, J MCCALLUM, JC BOATNER, LA AF RANKIN, J MCCALLUM, JC BOATNER, LA TI THE EFFECT OF ANNEALING ENVIRONMENTS ON THE EPITAXIAL RECRYSTALLIZATION OF ION-BEAM-AMORPHIZED SRTIO3 SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID DIFFUSION; GROWTH AB Time-resolved reflectivity and Rutherford backscattering spectroscopy were used to investigate the effects of regrowth environments on the thermally induced solid phase epitaxial (SPE) regrowth of amorphous near-surface layers produced by ion implantation of single-crystal SrTiO3. Water vapor in the regrowth atmosphere was found to alter both the apparent rate and activation energy of the SPE regrowth. For relatively dry atmospheres, a single constant regrowth rate is observed at any given temperature, and the activation energy is 1.2 +/- 0.1 eV. When the concentration of H2O vapor in the atmosphere is increased, however, the regrowth activation energy effectively decreases to approximately 0.95 eV. When regrown in atmospheres containing H2O vapor, the SrTiO3 amorphous layer exhibits two distinct stages of SPE regrowth as compared to the single rate found for dry anneals. This two-stage process apparently results from the diffusion of H/OH from the regrowth atmosphere at the surface of the crystal through the amorphous layer to the regrowing crystalline/amorphous interface. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 24 TC 21 Z9 21 U1 3 U2 6 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 MAR PY 1992 VL 7 IS 3 BP 717 EP 724 DI 10.1557/JMR.1992.0717 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA HH520 UT WOS:A1992HH52000025 ER PT J AU TRUNNELL, M TORGESON, DR MARTIN, SW BORSA, F AF TRUNNELL, M TORGESON, DR MARTIN, SW BORSA, F TI LI-7 AND B-11 NUCLEAR-SPIN-LATTICE RELAXATION IN B2O3 + 0.7LI2O + XLICL GLASSY FAST IONIC CONDUCTORS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID MAGNETIC-RESONANCE; WILLIAMS-WATTS; GLASSES; NMR AB Nuclear spin-lattice relaxation rates, R1, are reported for lithium chloro-borate glassy fast ionic conductors for both the mobile Li-7 nuclei and the stationary B-11 nuclei, as functions of temperature and NMR resonance frequency. The Li-7 relaxation is driven by the lithium diffusion via quadrupole interactions. The data for all frequencies can be fitted by assuming a single correlation function of the form exp(-(t/tau(c)*)beta). In the fit a thermally activated correlation time, tau(c)*, is assumed with an effective activation energy E(a)* = 7400 K, higher than the one deduced from dc conductivity measurements. It is argued that the correlation function (CF) which determines the conductivity and the CF which determines the NMR relaxation may differ in the presence of collective effects in the lithium diffusion. The B-11 data indicate that the nuclear relaxation proceeds via a Raman two phonon process involving internal vibrational modes of the BO4 units heavily damped by reorientational motion. The data are fitted by an expression for R1 derived from an extension of the Van Kranendonk two phonon relaxation mechanism in insulators. The activation energy for the damping frequency is compared with E(a) = beta-E(a)* which should represent the 'single particle' energy barrier for the lithium motion. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. UNIV PAVIA,DIPARTIMENTO FIS,I-27100 PAVIA,ITALY. RP TRUNNELL, M (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 41 TC 39 Z9 39 U1 0 U2 3 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 MAR PY 1992 VL 139 IS 3 BP 257 EP 267 DI 10.1016/S0022-3093(05)80833-6 PG 11 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HK047 UT WOS:A1992HK04700009 ER PT J AU FEDERICI, G WU, CH RAFFRAY, AR BILLONE, MC AF FEDERICI, G WU, CH RAFFRAY, AR BILLONE, MC TI MODELING OF TRITIUM RELEASE FROM CERAMIC BREEDERS - STATUS AND SOME IMPLICATIONS FOR NEXT-STEP DEVICES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Review ID LITHIUM-BASE CERAMICS; COMPREHENSIVE MODEL; FUSION-REACTORS; CHEMICAL-STATES; LI2O; BEHAVIOR; THERMODYNAMICS; BLANKETS; SYSTEM; OXIDE AB As the International Thermonuclear Experimental Reactor (ITER) joint activities are approaching the phase of detailed engineering design, it is crucial to survey the status of development of theoretical models and computational methodologies for tritium transport in, and release from, fusion ceramic breeders anticipated to be irradiated in the next-step device. This paper reviews the tritium modeling area and summarizes recent progress made in the development of more accurate predictive capabilities. The areas upon which attention is focused include: identification of mechanisms and rate-limiting steps; material data-base status and needs; model validation and comparison with experimental results; parameter ranges of applicability; areas of latest advance and remaining crucial issues which require additional effort. Current model applications such as analysis of experimental results available from small-scale in-pile experiments, and tritium inventory calculations for fusion blankets of conceptual designs are discussed. Areas of future applications are identified and emphasis is placed upon the growing need to improve on existing predictive capabilities to interpret tritium behavior and release results from solid breeder test components under pulsed conditions in ITER as well as to estimate more rigorously blanket tritium inventories. C1 UNIV CALIF LOS ANGELES,DEPT MECH AEROSPACE & NUCL ENGN,LOS ANGELES,CA 90024. ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. RP FEDERICI, G (reprint author), MAX PLANCK INST PLASMA PHYS,NET TEAM,BOLTZMANNSTR 2,W-8046 GARCHING,GERMANY. NR 108 TC 20 Z9 21 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD MAR PY 1992 VL 187 IS 1 BP 1 EP 31 DI 10.1016/0022-3115(92)90314-B PG 31 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA HH526 UT WOS:A1992HH52600001 ER PT J AU KLUEH, RL MAZIASZ, PJ AF KLUEH, RL MAZIASZ, PJ TI EFFECT OF IRRADIATION IN HFIR ON TENSILE PROPERTIES OF CR-MO STEELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID FERRITIC STEELS AB Tensile specimens of tempered martensitic 9Cr-1MoVNb and 12Cr-1MoVW steels with and without additions of 2% Ni were irradiated in the High Flux Isotope Reactor (HFIR) at 400 and 600-degrees-C to displacement-damage levels of up to 72 dpa. Nickel was added to the steels to produce transmutation helium, and up to 700 appm He was produced in the steels with 2% Ni. Irradiation at 400-degrees-C caused an increase in strength and a decrease in ductility, while irradiation at 600-degrees-C caused a decrease in strength and an increase in ductility. Results at 400-degrees-C were similar to data from previous tests on steel irradiated to approximately 11 dpa (up to 110 appm He), where it was concluded that helium caused a strength increase in addition to the hardening caused by displacement damage alone. The present results indicate that the helium-enhanced strengthening at 400-degrees-C saturates with increasing helium concentration, similar to the saturation (at a lower strength level) with displacement-damage dose found in the absence of helium. RP KLUEH, RL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. OI Maziasz, Philip/0000-0001-8207-334X NR 17 TC 28 Z9 29 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD MAR PY 1992 VL 187 IS 1 BP 43 EP 54 DI 10.1016/0022-3115(92)90317-E PG 12 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA HH526 UT WOS:A1992HH52600004 ER PT J AU KLUEH, RL ALEXANDER, DJ AF KLUEH, RL ALEXANDER, DJ TI EMBRITTLEMENT OF 9CR-1MOVNB AND 12CR-1MOVW STEELS IRRADIATED IN HFIR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID IMPACT PROPERTIES; FERRITIC STEELS; NICKEL CONTENT; TEMPERATURES AB Charpy impact specimens of 9Cr-1MoVNb and 12Cr-1MoVW steels and these steels with 2% Ni (9Cr-1MoVNb-2Ni and 12Cr-1MoVW-2Ni) were irradiated in the High Flux Isotope Reactor (HFIR) at 300-degrees-C up to 34 dpa and at 400-degrees-C to 42 dpa. Nickel was added to study the simultaneous effect of displacement damage and transmutation helium on toughness. Displacement damage is produced by fast neutrons and helium is produced by the reaction of Ni-58 with thermal neutrons in the mixed spectrum of HFIR. Irradiation caused large increases in the ductile-brittle transition temperature (DBTT) of all four steels. The saturation in the shift in DBTT with fluence that has been observed in such steels irradiated in fast reactors does not apply to specimens irradiated in HFIR. Shifts in DBTT of over 300-degrees-C were observed at 400-degrees-C for 9CR-1MoVW-2Ni and 12Cr-1MoVW-2Ni; shifts of over 200-degrees-C were observed for the standard steels. The shifts are the largest ever recorded for this type of steel and are attributed to the high helium concentrations (up to 400 appm). RP KLUEH, RL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 27 TC 43 Z9 43 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD MAR PY 1992 VL 187 IS 1 BP 60 EP 69 DI 10.1016/0022-3115(92)90319-G PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA HH526 UT WOS:A1992HH52600006 ER PT J AU PARK, K OLANDER, DR AF PARK, K OLANDER, DR TI DEFECT MODELS FOR THE OXYGEN POTENTIALS OF GADOLINIUM-DOPED AND EUROPIUM-DOPED URANIA SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID TEMPERATURE-RANGE 1000-1500-DEGREES-C; OXIDE REACTOR-FUELS; SOLID-SOLUTIONS; THERMODYNAMICS; DIOXIDE; UO2+X AB A defect model for the thermochemistry of the mixed rare-earth uranium oxides has been developed. The parameters of the model were determined by fitting the theory to experimental oxygen potential data. The basic defects and associated equilibria found previously for pure urania were used in the mixed oxide defect model. In addition, the model prohibits oxygen interstitial occupancy of six to ten sites neighboring a trivalent dopant ion and assumes vacancy-dopant clusters in an excess of oxygen vacancies. Successful modeling of the oxygen potential as a function of temperature and oxide composition was achieved by assuming gadolinium to be present as isolated ions in the lattice, but europium modeling required complexes consisting of six Eu3+ and one anion vacancy. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP PARK, K (reprint author), KYUNGHEE UNIV,DEPT NUCL ENGN,SEOUL,SOUTH KOREA. NR 16 TC 32 Z9 32 U1 4 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD MAR PY 1992 VL 187 IS 1 BP 89 EP 96 DI 10.1016/0022-3115(92)90323-D PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA HH526 UT WOS:A1992HH52600010 ER PT J AU MEZA, JC SYMES, WW AF MEZA, JC SYMES, WW TI CONJUGATE RESIDUAL METHODS FOR ALMOST SYMMETRICAL LINEAR-SYSTEMS SO JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS LA English DT Article DE ITERATIVE METHODS; KRYLOV SUBSPACES; CONJUGATE GRADIENT METHODS; SPARSE MATRICES ID ITERATIVE METHODS; CONVERGENCE AB This paper concerns the use of conjugate residual methods for the solution of nonsymmetric linear systems arising in applications to differential equations. We focus on an application derived from a seismic inverse problem. The linear system is a small perturbation to a symmetric positive-definite system, the nonsymmetries arising from discretization errors in the solution of certain boundary-value problems. We state and prove a new error bound for a class of generalized conjugate residual methods; we show that, in some cases, the perturbed symmetric problem can be solved with an error bound similar to the one for the conjugate residual method applied to the symmetric problem. We also discuss several applications for special distributions of eigenvalues. C1 RICE UNIV,DEPT MATH SCI,HOUSTON,TX 77251. RP MEZA, JC (reprint author), SANDIA NATL LABS,TECH STAFF,LIVERMORE,CA 94550, USA. RI Meza, Juan/B-5601-2012; OI Meza, Juan/0000-0003-4543-0349 NR 20 TC 0 Z9 2 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-3239 J9 J OPTIMIZ THEORY APP JI J. Optim. Theory Appl. PD MAR PY 1992 VL 72 IS 3 BP 415 EP 440 DI 10.1007/BF00939835 PG 26 WC Operations Research & Management Science; Mathematics, Applied SC Operations Research & Management Science; Mathematics GA HE261 UT WOS:A1992HE26100001 ER PT J AU MEZA, JC SYMES, WW AF MEZA, JC SYMES, WW TI DEFLATED KRYLOV SUBSPACE METHODS FOR NEARLY SINGULAR LINEAR-SYSTEMS SO JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS LA English DT Article DE ITERATIVE METHODS; KRYLOV SUBSPACES; CONJUGATE GRADIENT METHODS; NONSYMMETRIC MATRICES; DEFLATED DECOMPOSITIONS; SPARSE MATRICES ID EQUATIONS; POINTS AB This paper concerns the use of Krylov subspace methods for the solution of nearly singular nonsymmetric linear systems. We show that the incomplete orthogonalization methods (IOM) in conjunction with certain deflation techniques of Stewart, Chan, and Saad can be used to solve large nonsymmetric linear systems which are nearly singular. C1 RHODES UNIV,DEPT MATH SCI,GRAHAMSTOWN 6140,SOUTH AFRICA. RP MEZA, JC (reprint author), SANDIA NATL LABS,TECH STAFF,LIVERMORE,CA 94550, USA. RI Meza, Juan/B-5601-2012; OI Meza, Juan/0000-0003-4543-0349 NR 19 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-3239 J9 J OPTIMIZ THEORY APP JI J. Optim. Theory Appl. PD MAR PY 1992 VL 72 IS 3 BP 441 EP 457 DI 10.1007/BF00939836 PG 17 WC Operations Research & Management Science; Mathematics, Applied SC Operations Research & Management Science; Mathematics GA HE261 UT WOS:A1992HE26100002 ER PT J AU CONSTANT, KP MASON, TO ROTHMAN, SJ ROUTBORT, JL AF CONSTANT, KP MASON, TO ROTHMAN, SJ ROUTBORT, JL TI NONSTOICHIOMETRY, ELECTRICAL-PROPERTIES, AND CATION DIFFUSION IN HIGHLY NONSTOICHIOMETRIC CO1-XO .1. EXPERIMENTAL SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE COBALT MONOXIDE; POINT DEFECTS; ELECTRICAL CONDUCTIVITY; THERMOELECTRIC POWER; NONSTOICHIOMETRY; DIFFUSION; SMALL POLARON ID DEFECT STRUCTURE; COBALTOUS OXIDE; HIGH-TEMPERATURE; SINGLE-CRYSTALS; SELF-DIFFUSION; COO; NONSTOICHIOMETRY; TRANSPORT AB Non-stoichiometry and mass and electrical transport properties were measured in pure, single crystal Co1-xO with 0.003 less-than-or-equal-to x less-than-or-equal-to 0.044. Electrical conductivity and thermopower were measured at temperatures from 1000-degrees-C to 1200-degrees-C in a range of oxygen partial pressures, P(O2), of 0.21 to 32 atm. The cation tracer diffusion coefficient was measured at 1200-degrees-C in the same pressure range, and at 3.7 atm from 1064-degrees-C to 1200-degrees-C. Electrical properties were used to locate the Co1-xO/Co3O4 phase boundary. All properties show a stronger P(O2) dependence than predicted by a point defect theory based on ideal solutions. Analysis of the temperature dependence of hole mobility produced an activation energy for small polaron hopping of 0.37 +/- 0.04 eV. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Mason, Thomas/B-7528-2009; Constant, Kristen/C-3673-2014 OI Constant, Kristen/0000-0001-7138-9365 NR 29 TC 17 Z9 17 U1 1 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD MAR PY 1992 VL 53 IS 3 BP 405 EP 411 PG 7 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA HG189 UT WOS:A1992HG18900010 ER PT J AU CONSTANT, KP MASON, TO ROUTBORT, JL AF CONSTANT, KP MASON, TO ROUTBORT, JL TI NONSTOICHIOMETRY, ELECTRICAL-PROPERTIES, AND CATION DIFFUSION IN HIGHLY NONSTOICHIOMETRIC CO1-XO .2. MODELING THE DEFECT STRUCTURE SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE CO1-XO, DEFECT MODELING; DEBYE HUCKEL THEORY; DEFECT CLUSTERING ID HIGH-TEMPERATURE; COO AB The defect structure of highly non-stoichometric Co1-x is examined by fitting non-stoichiometry, electrical proper-ties and cation diffusion data with various models. The ideal point defect model, the generalized cluster model and Debye-Huckel theory model for isolated vacancies are all shown to be inadequate in describing the properties dependence on oxygen partial pressure. A model is developed which considers non-interacting isolated vacancies, V' and V", and 4: 1"' lusters with Debye-Huckel interactions. All properties were accurately fit from 10(-6) less-than-or-equal-to P(O2) less-than-or-equal-to 35 atm at 1200-degrees-C using this non-unique model. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP CONSTANT, KP (reprint author), MIT,CAMBRIDGE,MA 02139, USA. RI Mason, Thomas/B-7528-2009; Constant, Kristen/C-3673-2014 OI Constant, Kristen/0000-0001-7138-9365 NR 22 TC 14 Z9 14 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD MAR PY 1992 VL 53 IS 3 BP 413 EP 418 PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA HG189 UT WOS:A1992HG18900011 ER PT J AU NILSEN, J AF NILSEN, J TI RESONANTLY PHOTOPUMPED NA-LIKE X-RAY LASERS SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID POPULATION-INVERSION; PHOTOEXCITATION; PLASMAS; GAIN; LINE; TITANIUM; IX AB We examine the possibility of achieving X-ray lasing in Na-like ions by utilizing Ly-alpha or He-alpha radiation to resonantly photo-pump an electron from the n = 3 state of the Na-like ion to the n = 5 or 6 state with subsequent lasing between the n = 6 --> n = 5, n = 6 --> n = 4, or n = 5 --> n = 4 states of the Na-like ion. To identify potential resonances, we calculate all of the n = 3 --> n = 5 and 6 transitions in Na-like ions which look favorable for pumping and identify the resonances which are possible with Ly-alpha or He-alpha-radiation. Many promising laser candidates are identified, as well as an interesting near resonance, which runs across the periodic chart, between the He-alpha-line and the 3d --> 6f Na-like transition. RP NILSEN, J (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-59,LIVERMORE,CA 94550, USA. NR 30 TC 11 Z9 13 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD MAR PY 1992 VL 47 IS 3 BP 171 EP 177 DI 10.1016/0022-4073(92)90026-Z PG 7 WC Optics; Spectroscopy SC Optics; Spectroscopy GA HJ005 UT WOS:A1992HJ00500002 ER PT J AU GRAY, JW LUCAS, JN PINKEL, D AWA, A AF GRAY, JW LUCAS, JN PINKEL, D AWA, A TI STRUCTURAL CHROMOSOME ANALYSIS BY WHOLE CHROMOSOME PAINTING FOR ASSESSMENT OF RADIATION-INDUCED GENETIC-DAMAGE SO JOURNAL OF RADIATION RESEARCH LA English DT Article ID INSITU HYBRIDIZATION; HUMAN-LYMPHOCYTES; ABERRATIONS; DNA C1 UNIV CALIF SAN FRANCISCO,DEPT LAB MED,DIV MOLEC CYTOMETRY,SAN FRANCISCO,CA 94143. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RADIAT EFFECTS RES FDN,HIROSHIMA 730,JAPAN. NR 19 TC 22 Z9 22 U1 0 U2 1 PU JAPAN RADIATION RESEARCH SOC PI CHIBA PA C/O NAT INST RADIOLOGICAL SCI 9-1 ANAGAWA-4-CHOME INAGE-KU, CHIBA 263, JAPAN SN 0449-3060 J9 J RADIAT RES JI J. Radiat. Res. PD MAR PY 1992 VL 33 SU S BP 80 EP 86 DI 10.1269/jrr.33.SUPPLEMENT_80 PG 7 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA JD400 UT WOS:A1992JD40000012 PM 1380556 ER PT J AU AWA, AA NAKANO, M OHTAKI, K KODAMA, Y LUCAS, J GRAY, J AF AWA, AA NAKANO, M OHTAKI, K KODAMA, Y LUCAS, J GRAY, J TI FACTORS THAT DETERMINE THE INVIVO DOSE-RESPONSE RELATIONSHIP FOR STABLE CHROMOSOME-ABERRATIONS IN A-BOMB SURVIVORS SO JOURNAL OF RADIATION RESEARCH LA English DT Article DE STABLE CHROMOSOME ABERRATIONS; TRANSLOCATIONS; DOSE-RESPONSE RELATIONSHIP; ABERRATION FREQUENCIES; A-BOMB SURVIVORS AB An overview is given of the dose-response relationship for stable chromosome aberrations (i.e., translocations and inversions) in the peripheral blood lymphocytes of A-bomb survivors in Hiroshima. Special emphasis is placed on (i) the overdispersion of survivor cases with either unexpectedly high or low aberration frequencies relative to the estimated DS86 kerma values assigned to individual survivors, termed "cytogenetic outliers", and (ii) the correlation of chromosome aberration frequencies with other biological endpoints, such as acute radiation symptoms (severe epilation). A new molecular biological technique, known as fluorescence in situ hybridization (FISH) with composite, whole-chromosome probes to paint differentially the target chromosomes, has facilitated rapid, efficient, and extensive scoring of translocation-type chromosome aberrations in which the target chromosomes are involved. Using this methodology, the observed findings on translocation frequencies in A-bomb survivors have shown that the frequency of stable chromosome aberrations, which have persisted for years without change in frequency in irradiated persons, is indeed useful as an indicator for biological dosimetry. C1 RADIAT EFFECTS RES FDN,DEPT GENET,HIROSHIMA 732,JAPAN. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,DIV MOLEC CYTOMETRY,SAN FRANCISCO,CA 94943. NR 13 TC 17 Z9 17 U1 0 U2 0 PU JAPAN RADIATION RESEARCH SOC PI CHIBA PA C/O NAT INST RADIOLOGICAL SCI 9-1 ANAGAWA-4-CHOME INAGE-KU, CHIBA 263, JAPAN SN 0449-3060 J9 J RADIAT RES JI J. Radiat. Res. PD MAR PY 1992 VL 33 SU S BP 206 EP 214 DI 10.1269/jrr.33.SUPPLEMENT_206 PG 9 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA JD400 UT WOS:A1992JD40000022 PM 1507170 ER PT J AU PIETRELLI, L MAUSNER, LF KOLSKY, KL AF PIETRELLI, L MAUSNER, LF KOLSKY, KL TI SEPARATION OF CARRIER-FREE SC-47 FROM TITANIUM TARGETS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article AB The radiochemical separation of no-carrier-added (NCA) Sc-47 from (nat)Ti targets has been studied. Scandium-47, a medium-energy beta-emitter, is intended for use with labelled tumor associated monoclonal antibodies for radiotherapy. Several radiochemical methods for the separation of NCA Sc-47 from macroquantities of titanium and other impurities were tested. Four different procedures based on ion exchange, solvent extraction and extraction chromatography are reported. For each method, parameters such as the distribution coefficient, kinetics and recoveries are reported. The selective separation can be performed rapidly by all methods. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RP PIETRELLI, L (reprint author), CTR RIC ENERGIA CASACCIA,ENTE NAZL ENERGIA ATOM,MEPIS,DRI,VIA ANGUILLARESE 302,I-00060 ROME,ITALY. OI Pietrelli, Loris/0000-0002-3825-1468 NR 14 TC 13 Z9 13 U1 1 U2 5 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD MAR PY 1992 VL 157 IS 2 BP 335 EP 345 DI 10.1007/BF02047448 PG 11 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA HH997 UT WOS:A1992HH99700012 ER PT J AU LIN, WJ HARBOTTLE, G AF LIN, WJ HARBOTTLE, G TI GAMMA-RAY EMISSION INTENSITIES OF THE TH-232 CHAIN IN SECULAR EQUILIBRIUM, OF U-235 AND THE PROGENY OF U-238 SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article AB A Th-232 source of known disintegration rate and in secular equilibrium was measured to determine the absolute gamma-ray emission intensities of members of its decay chain. Similar measurements were made on sources of highly-enriched U-235 and of normal uranium metal. The results are compared with values from the literature. RP LIN, WJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 14 TC 15 Z9 15 U1 0 U2 0 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD MAR PY 1992 VL 157 IS 2 BP 367 EP 372 DI 10.1007/BF02047451 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA HH997 UT WOS:A1992HH99700015 ER PT J AU TARDIF, SD ZIEGLER, TE AF TARDIF, SD ZIEGLER, TE TI FEATURES OF FEMALE REPRODUCTIVE SENESCENCE IN TAMARINS (SAGUINUS SPP), A NEW-WORLD PRIMATE SO JOURNAL OF REPRODUCTION AND FERTILITY LA English DT Article DE AGING; OVARY; TAMARINS ID URINARY ESTROGEN EXCRETION; OEDIPUS-OEDIPUS; RHESUS-MONKEYS; SOCIAL INFLUENCES; OVARIAN-FUNCTION; GONADOTROPIN; MENOPAUSE; MODEL AB Cyclical changes in concentration of plasma progesterone, urinary oestrone-conjugates and urinary luteinizing hormone (LH) were compared in young and older cotton-top tamarins (Saguinus oedipus) and saddle-backed tamarins (S. fuscicollis). A group of six young adult tamarin females (4-5 years of age) was sampled over eight periods of 6-8 weeks and six older (14-20 years of age) females were sampled over thirteen periods. There was hormonal evidence of ovulation in all of the sampling periods for young females, in five of thirteen periods, older females displayed no evidence of ovulation. Of the six older females, two were anovulatory in one sampling period, while one female displayed no evidence of ovulation in any of three sampling periods. Generally, females over 17 years of age either did not ovulate or displayed abnormally long periods of moderate concentrations of progesterone and oestrone conjugates. Basal concentrations of LH differed in individuals, but were not always higher in older females. In contrast to patterns of reproductive senescence in other primates, older, anovulatory tamarins displayed moderate concentrations of urinary oestrone conjugates (5-50-mu-g/mg creatinine) and plasma progesterone (8-19 ng/ml), both of which are hormones of probable luteal origin in these species. This result suggests continued production of steroids by the luteal cells of the prominent interstitial gland in reproductively senescent tamarins. This suggestion was reinforced by histological examination of the ovaries of four older, anovulatory females; few primary follicles were found. Three females had not normal antral follicles, but all females had large luteal masses. The presence of functional luteal cells in the older ovaries, which do not experience regular follicular development, may distinguish ovarian ageing in New World primates from that of Old World primates. C1 UNIV WISCONSIN,DEPT PSYCHOL,MADISON,WI 53706. RP TARDIF, SD (reprint author), OAK RIDGE ASSOCIATED UNIV,MARMOSET RES CTR,OAK RIDGE,TN 37830, USA. FU NCRR NIH HHS [RR02022, RR-00167]; NIMH NIH HHS [MH 35-215] NR 33 TC 35 Z9 36 U1 0 U2 4 PU J REPROD FERTIL INC PI CAMBRIDGE PA 22 NEWMARKET RD, CAMBRIDGE, ENGLAND CB5 8DT SN 0022-4251 J9 J REPROD FERTIL JI J. Reprod. Fertil. PD MAR PY 1992 VL 94 IS 2 BP 411 EP 421 PG 11 WC Reproductive Biology SC Reproductive Biology GA HR770 UT WOS:A1992HR77000015 PM 1317448 ER PT J AU CHRISTENSEN, B DROTNING, W THUNBORG, S AF CHRISTENSEN, B DROTNING, W THUNBORG, S TI MODEL-BASED, SENSOR-DIRECTED REMEDIATION OF UNDERGROUND-STORAGE TANKS SO JOURNAL OF ROBOTIC SYSTEMS LA English DT Article AB Sensor-rich, intelligent robots that function with respect to models of their environment have significant potential to reduce the time and cost for the cleanup of hazardous waste while increasing operator safety. Sandia National Laboratories is performing experimental investigations into the application of intelligent robot control technology to the problem of removing waste stored in tanks. This article describes the experimental environment employed at Sandia with particular attention to the computing and software control environment. Intelligent system control is achieved through the integration of extensive geometric and kinematic world models with real-time sensor-based control. All operator interactions with the system are through fully animated, graphical representations that validate all operator commands before execution to provide for safe operation. Sensing is used to add information to the robot system's world model and to allow sensor-based servo control during selected operations. The results of a first critical features test are reported and the potential for applying advanced intelligent control concepts to the removal of waste in storage tanks is discussed. RP CHRISTENSEN, B (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 4 TC 5 Z9 5 U1 4 U2 5 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0741-2223 J9 J ROBOTIC SYST JI J. Robot. Syst. PD MAR PY 1992 VL 9 IS 2 BP 145 EP 159 DI 10.1002/rob.4620090203 PG 15 WC Robotics SC Robotics GA HG030 UT WOS:A1992HG03000002 ER PT J AU HOLLEN, RM AF HOLLEN, RM TI NUCLEAR SAMPLE MANAGEMENT USING A PLUTONIUM DISSOLUTION ROBOTIC SYSTEM SO JOURNAL OF ROBOTIC SYSTEMS LA English DT Article AB At Los Alamos National Laboratory, a unique sample management robotic system has been developed that automates plutonium metal acid dissolutions, the aliquoting of resulting solutions to be analyzed using several analytical chemistry methods, and automates the barcode labeling of the solution containment vial providing positive solution identification. This system is based upon a commercial laboratory robot from Zymark, Inc. that has been enhanced by the addition of custom robotic workstations engineered and fabricated at our facility. This system will significantly reduce personnel radiation exposure and eliminate the redundancy of each analytical area producing separate dissolved plutonium solutions, which are used in chemical analyses. RP HOLLEN, RM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0741-2223 J9 J ROBOTIC SYST JI J. Robot. Syst. PD MAR PY 1992 VL 9 IS 2 BP 161 EP 168 DI 10.1002/rob.4620090204 PG 8 WC Robotics SC Robotics GA HG030 UT WOS:A1992HG03000003 ER PT J AU ROWE, JC BUTLER, PL GLASSELL, RL HERNDON, JN AF ROWE, JC BUTLER, PL GLASSELL, RL HERNDON, JN TI NASA LABORATORY TELEROBOTIC MANIPULATOR CONTROL-SYSTEM ARCHITECTURE SO JOURNAL OF ROBOTIC SYSTEMS LA English DT Article AB In support of the National Aeronautics and Space Administration (NASA) goals to increase the utilization of dexterous robotic systems in space, the Oak Ridge National Laboratory (ORNL) has developed the Laboratory Telerobotic Manipulator (LTM) system. It is a dexterous, dual-arm, force-reflecting teleoperator system with robotic features for NASA ground-based research. This article describes the overall control system architecture, including both hardware and software. The control system is a distributed, modular, and hierarchical design with flexible expansion capabilities for future enhancements of both hardware and software. RP ROWE, JC (reprint author), OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,OAK RIDGE,TN 37831, USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0741-2223 J9 J ROBOTIC SYST JI J. Robot. Syst. PD MAR PY 1992 VL 9 IS 2 BP 291 EP 300 DI 10.1002/rob.4620090212 PG 10 WC Robotics SC Robotics GA HG030 UT WOS:A1992HG03000011 ER PT J AU RAJU, PS TEOTIA, APS AF RAJU, PS TEOTIA, APS TI FORECASTING MARKET DEMAND WITH THE DISCRETE-CHOICE MODEL - AN APPLICATION TO ELECTRIC HEAT-PUMPS SO JOURNAL OF SCIENTIFIC & INDUSTRIAL RESEARCH LA English DT Article AB Discrete-choice models are used to characterize situations in which the dependent variable assumes only discrete values. As a forecasting tool, this is perhaps one of the lesser-known methodologies to marketers. This paper illustrates how the discrete-choice model can be used to forecast market penetration and demand for a new technology. A binary-choice model using a logit formulation is applied to the case of electric heat pump using data from the US Department of Energy Residential Energy Consumption Surveys. The parameters of this nonlinear model are estimated by the Maximum Likelihood Method, which provides strongly consistent estimators. C1 ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439. UNIV LOUISVILLE,DEPT MARKETING,LOUISVILLE,KY 40292. NR 23 TC 0 Z9 0 U1 0 U2 2 PU COUNCIL SCIENTIFIC INDUSTRIAL RESEARCH PI NEW DELHI PA PUBL & INFO DIRECTORATE, NEW DELHI 110012, INDIA SN 0022-4456 J9 J SCI IND RES INDIA JI J. Sci. Ind. Res. PD MAR PY 1992 VL 51 IS 3 BP 296 EP 306 PG 11 WC Engineering, Multidisciplinary SC Engineering GA JE841 UT WOS:A1992JE84100019 ER PT J AU TELLER, RG BLUM, P KOSTINER, E HRILJAC, JA AF TELLER, RG BLUM, P KOSTINER, E HRILJAC, JA TI DETERMINATION OF THE STRUCTURE OF (VO)3(PO4)2.9H2O BY POWDER X-RAY-DIFFRACTION ANALYSIS SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE; VO(HPO4).0.5H2O; REFINEMENT; OXIDATION C1 UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06268. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP TELLER, RG (reprint author), BP RES INT,4440 WARRENSVILLE CTR RD,CLEVELAND,OH 44128, USA. NR 19 TC 9 Z9 9 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD MAR PY 1992 VL 97 IS 1 BP 10 EP 18 DI 10.1016/0022-4596(92)90003-E PG 9 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA HF999 UT WOS:A1992HF99900002 ER PT J AU GRANT, PM ROBOUCH, P TORRES, RA BAISDEN, PA SILVA, RJ AF GRANT, PM ROBOUCH, P TORRES, RA BAISDEN, PA SILVA, RJ TI SOLUTION THERMODYNAMICS AT HIGH-TEMPERATURE .1. PR-DIGLYCOLATE STABILITY-CONSTANTS FROM 23 TO 95-DEGREES-C SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE PRASEODYMIUM; DIGLYCOLATE; COMPLEXATION; FREE ENERGY; HIGH TEMPERATURE; SPECTROSCOPY; FIBEROPTICS ID NIR SPECTROSCOPY; WASTE AB Instrumentation has been developed to perform liquid-phase optical absorption spectroscopy at elevated temperature within the restricted enclosure of a high-level radioactivity glovebox. Absorbance measurements of the praseodymium-diglycolate complex allowed the determination of thermodynamic stability constants for two or three metal-ligand complexes at temperatures of 23, 50, 65, 80, and 95-degrees-C and an ionic strength of 1M (NaClO4). Agreement of these results with prior literature values at 25 and 50-degrees-C is very good and demonstrates the validity of the present technique. Over the temperature range of 5 to 95-degrees-C, the variation of the free energy of complexation is adequately described by functions linear with temperature for all three complexes. Reaction enthalpies and entropies were calculated from the data via the van't Hoff equation. RP GRANT, PM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,L-234,LIVERMORE,CA 94550, USA. NR 25 TC 4 Z9 4 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD MAR PY 1992 VL 21 IS 3 BP 213 EP 227 DI 10.1007/BF00647018 PG 15 WC Chemistry, Physical SC Chemistry GA HL150 UT WOS:A1992HL15000001 ER PT J AU REDA, DC AESCHLIMAN, DP AF REDA, DC AESCHLIMAN, DP TI LIQUID-CRYSTAL COATINGS FOR SURFACE SHEAR-STRESS VISUALIZATION IN HYPERSONIC FLOWS SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB Experiments were conducted to test the surface shear-stress visualization capabilities of shear-stress-sensitive/temperature-insensitive liquid crystal compounds in hypersonic flow. Liquid crystal coatings were applied to the surface of a conical model, which was then exposed to a high unit Reynolds number (2.3 x 10(7)/m) Mach 5 flow. The coating was illuminated by white light, and its response to the various flow situations was monitored and recorded with standard video and high-speed movie cameras. Abrupt changes in surface shear stress (e.g., a transition front) are made visible by an abrupt change in the color of the liquid crystal coating. The dynamic location of such a color change front as a function of model angle of attack (for sharp and blunt cones, with and without boundary-layer trips) was recorded, and observations were found to be consistent with established (published) trends for transition-front movement on conical bodies exposed to hypersonic flows. The highly transient flow over the model during tunnel shutdown was recorded (at 400 frames/s), and the liquid crystal coating was observed to respond to an event reasoned to be normal shock passage in a time interval less than or equal to the time between sequential movie frame exposures (less-than-or-equal-to 0.0025 s). The liquid crystal technique has thus been demonstrated as a viable diagnostic tool for use in transient/compressible flows. C1 SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DIV EXPTL AERODYNAM,ALBUQUERQUE,NM 87185. NR 21 TC 10 Z9 10 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD MAR-APR PY 1992 VL 29 IS 2 BP 155 EP 158 DI 10.2514/3.26329 PG 4 WC Engineering, Aerospace SC Engineering GA HM954 UT WOS:A1992HM95400002 ER PT J AU SINHA, UP LEVINSON, DW AF SINHA, UP LEVINSON, DW TI TENSILE-STRESS RELAXATION IN HIGH-STRENGTH SPRING STEEL WIRE SO JOURNAL OF TESTING AND EVALUATION LA English DT Article DE STRESS RELAXATION; RESIDUAL STRESS; RESONANT FREQUENCY; FREQUENCY TEST METHOD; LOOP TEST METHOD; OSCILLATOR AB Stress relaxation data were obtained in tension tests using the vibrating string technique (measuring the resonance frequency) in spring steel wire of ASTM Grade A 228 (also known as music wire). The steel wire of 0.56 mm diameter had a 0.20% offset tensile yield strength of 1689 MPa. Tests were conducted at low temperatures in the range of 23 to 140-degrees-C, and at initial stress levels of up to 75% of the 0.20% offset yield strength of the wire. The test duration was to 4000 h at 23-degrees-C and to 100 h at temperatures to 140-degrees-C. The test results indicate a faster rate of stress relaxation during the early stage of stress relaxation, and subsequently a slower rate of stress relaxation rate with increasing time, as is usually observed. An empirical equation has been determined that fits the experimental data very well under the given test conditions. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV ILLINOIS,DEPT MET,CHICAGO,IL 60648. NR 32 TC 0 Z9 0 U1 1 U2 4 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0090-3973 J9 J TEST EVAL JI J. Test. Eval. PD MAR PY 1992 VL 20 IS 2 BP 114 EP 120 PG 7 WC Materials Science, Characterization & Testing SC Materials Science GA JY511 UT WOS:A1992JY51100003 ER PT J AU LI, Y THOMPSON, RB AF LI, Y THOMPSON, RB TI EFFECTS OF DISPERSION ON THE INFERENCE OF METAL TEXTURE FROM S0 PLATE MODE MEASUREMENTS .1. EVALUATION OF DISPERSION CORRECTION METHODS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID STRESS AB Ultrasonic S0 waves (fundamental symmetric Lamb modes) are being considered in several laboratories for the nondestructive characterization of the texture (preferred grain orientation) and formability of metal sheets and plates. In a typical experimental setup, the velocities of the S0 waves are measured as a function of wave propagation angle with respect to the rolling direction of the plate. However, the S0 waves are known to be dispersive, and that dispersion must be considered in order to isolate the small, texture-induced shifts in the S0 wave velocity. Currently, there are two approximate dispersion correction methods, one proposed by Thompson et al. [Met. Trans. A 20, 2431 (1989)] and the other introduced by Hirao and Fukuoka [J. Acoust. Soc. Am. 85, 2311 (1989)]. In this paper, these two methods will be evaluated using an exact theory for wave propagation in orthotropic plates. Through the evaluation, the limits of the current texture measurement techniques are established. It is found that when plate thickness to wavelength ratio is less than 0.15, both Thompson's and Hirao's methods work satisfactorily. When the thickness to wavelength ratio exceeds 0.3, neither Thompson's nor Hirao's dispersion correction method provides adequate corrections for the current texture measurement techniques. Within the range of 0.15-0.3, Thompson's method is recommended for weakly anisotropic sheets and plates and Hirao's method may be more appropriate for some strongly anisotropic cases. RP LI, Y (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 26 TC 12 Z9 12 U1 3 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1992 VL 91 IS 3 BP 1298 EP 1309 DI 10.1121/1.402512 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500009 PM 1564187 ER PT J AU HODGSON, AT GARBESI, K SEXTRO, RG DAISEY, JM AF HODGSON, AT GARBESI, K SEXTRO, RG DAISEY, JM TI SOIL-GAS CONTAMINATION AND ENTRY OF VOLATILE ORGANIC-COMPOUNDS INTO A HOUSE NEAR A LANDFILL SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID RADON TRANSPORT; PRESSURE; BASEMENTS; AIR AB Toxic volatile organic compounds (VOC) are commonly found in landfills, including those accepting only municipal waste. These VOC can migrate away from the site through the soil and result in contaminated off-site soil gas. This contaminated soil gas can enter houses built near landfills and is a potential source of human exposure to VOC. This study investigated soil-gas contamination and the mechanisms of entry of VOC into a house with a basement sited adjacent to a municipal landfill. The VOC were identified and quantified in the soil gas and in indoor and outdoor air. Pressure coupling between the basement and the surrounding soil was measured. Using soil-gas tracers, the pressure-driven advective entry of soil gas was quantified as a function of basement depressurization. From the measurements, estimates were made for the diffusive and advective entry rates of VOC into the house. A comparison of the chlorinated hydrocarbons found in soil gas at the site and in the landfill suggests that the landfill is the source of the halogenated compounds in the vicinity of the house. At the conditions of the study, the diffusive and advective entry rates of VOC from soil into the basement were estimated to be low and of similar magnitude. Advective entry of soil gas into the house was limited by the low soil air permeability and the low below-grade leakage area of the basement. For this reason, high indoor concentrations due to the intrusion of VOC from soil gas are unlikely at this house, even under conditions that would produce relatively large underpressures in the basement. RP HODGSON, AT (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720, USA. NR 18 TC 33 Z9 33 U1 1 U2 4 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA PO BOX 2861, PITTSBURGH, PA 15230 SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD MAR PY 1992 VL 42 IS 3 BP 277 EP 283 PG 7 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA HK431 UT WOS:A1992HK43100012 ER PT J AU BECHER, PF SWAIN, MV AF BECHER, PF SWAIN, MV TI GRAIN-SIZE-DEPENDENT TRANSFORMATION BEHAVIOR IN POLYCRYSTALLINE TETRAGONAL ZIRCONIA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID MARTENSITIC TRANSFORMATIONS; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; FRACTURE-TOUGHNESS; TOUGHENED CERAMICS; BRITTLE SOLIDS; STRESS-FIELD; ZRO2; THERMODYNAMICS; DEFORMATION AB Experimental observations of the tetragonal phase transformation behavior in polycrystalline zirconias and the related toughening contribution are presented. An analysis which considers transformation thermodynamics and residual stresses is developed to describe the influence of grain size on tetragonal-to-monoclinic transformation temperature. The model is based on the promotion of the transformation by local internal tensile stress concentrations whose effects scale with grain size. The analysis is supported by observations of the martensite start temperature-grain size behavior in polycrystalline tetragonal zirconia containing 12 mol% ceria (12CeTZP). Next, the analysis considers the grain-size-dependent behavior of the transformation-toughening contribution, DELTA-K(T), and the transformation zone size, r(T). The tetragonal-to-monoclinic (t-to-m) formation temperature, M(s), increases with increase in tetragonal grain size, d. Experimental results for zirconia-12 mol% ceria (12CeTZP) and 2YTZP ceramics illustrate the predicted forms of the grain size dependencies for DELTA-K(T) and r(T). The analytical model also describes the temperature dependence of the transformation-toughening contribution DELTA-K(T) observed in 2 mol% yttria-doped polycrystalline tetragonal zirconias (2YTZP). C1 UNIV SYDNEY,DEPT MECH ENGN,SYDNEY,NSW 2006,AUSTRALIA. RP BECHER, PF (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 47 TC 140 Z9 141 U1 3 U2 34 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 MAR PY 1992 VL 75 IS 3 BP 493 EP 502 DI 10.1111/j.1151-2916.1992.tb07832.x PG 10 WC Materials Science, Ceramics SC Materials Science GA HJ063 UT WOS:A1992HJ06300003 ER PT J AU HARBOUR, JR AF HARBOUR, JR TI VOLATILITY OF SIMULATED HIGH-LEVEL NUCLEAR WASTE GLASS BY THERMOGRAVIMETRIC ANALYSIS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID BOROSILICATE GLASSES; VAPORIZATION; SODIUM; CANISTER; CESIUM AB The volatilities of simulated, high-level nuclear waste glasses have been measured using thermogravimetric analysis (TGA). These volatilities were measured in the region of the glass transition temperature (T(g)) of the waste glasses, which is between 450-degrees and 500-degrees-C. These data were obtained because the Waste Acceptance Preliminary Specifications require that no foreign materials be released into the canistered waste form upon heating of the canister to this glass transition temperature. In fact, all of the waste glass samples studied actually exhibited a net weight gain upon heating. This weight gain was shown to be due to oxygen uptake through oxidation of FEO. Powdered glass samples did show a small weight loss which was smaller in magnitude than the weight gain and was associated with water desorption. No true volatility was detected to the level of sensitivity (0.01 wt%) of the TGA instrument. This converts to a sensitivity of 330-mu-g/m2 of glass surface and a corresponding minimum value of 41 mg of volatiles for each Defense Waste Processing Facility canistered waste form. TGA experiments carried out at higher temperatures (800-degrees-C) revealed that organic concentrations in the waste glasses are less than 0.01 wt%. Thus, these results demonstrate that the Defense Waste Processing Facility will be able to comply with the Waste Acceptance Preliminary Specifications on the exclusion of foreign materials from the canistered waste forms, after exposure to T(g). RP WESTINGHOUSE SAVANNAH RIVER CO, SAVANNAH RIVER SITE, AIKEN, SC 29808 USA. NR 23 TC 2 Z9 2 U1 1 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 MAR PY 1992 VL 75 IS 3 BP 507 EP 513 DI 10.1111/j.1151-2916.1992.tb07834.x PG 7 WC Materials Science, Ceramics SC Materials Science GA HJ063 UT WOS:A1992HJ06300005 ER PT J AU GARINO, T AF GARINO, T TI HETEROCOAGULATION AS AN INCLUSION COATING TECHNIQUE FOR CERAMIC COMPOSITE PROCESSING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID POSITIVE PARTICLES; NEGATIVE PARTICLES; SILICON; SUSPENSIONS; ADSORPTION; WHISKERS; POLYMER; SURFACE; POWDERS AB Colloidal heterocoagulation in aqueous media was used to form coatings of alumina or polystyrene latex particles on alumina spheres and of alumina or latex particles on silicon carbide whiskers. The polyelectrolyte dispersants poly-(ammonium methacrylate) and poly(ethylenimine) were used to alter the inherent surface potentials of the materials to increase the applicability of this technique. In most cases, the coatings formed were partial monolayers, although thicker coatings of alumina were formed on the SiC due to aggregation of the alumina. The oxide coatings were relatively well adhered while the latex coatings were easily removed in aqueous media. The adherence of the latex coatings was improved by adding low alcohols to the heterocoagulating suspension. RP GARINO, T (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 43 TC 35 Z9 38 U1 0 U2 7 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD MAR PY 1992 VL 75 IS 3 BP 514 EP 518 DI 10.1111/j.1151-2916.1992.tb07835.x PG 5 WC Materials Science, Ceramics SC Materials Science GA HJ063 UT WOS:A1992HJ06300006 ER PT J AU MYERS, BF AF MYERS, BF TI EFFECT OF WATER-VAPOR ON THE RELEASE OF FISSION GASES FROM URANIUM OXYCARBIDE IN HIGH-TEMPERATURE, GAS-COOLED REACTOR COATED FUEL-PARTICLES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article AB The hydrolysis of uranium oxycarbide (UCO) was studied by injecting water vapor into a fuel element containing a known number of high-temperature, gas-cooled reactor (HTGR) coated particles with exposed fuel kernels. The experiments were conducted in the High Flux Isotope Reactor (HFIR) at temperatures between 700-degrees and 1000-degrees-C, a system pressure of 200 kPa, and partial pressures of water vapor between 21 and 199 Pa. The general sequential response of the exposed fuel kernels to water vapor addition consisted of (1) a rapid release of stored fission gas with a concomitant increase in the steady-state release and (2) a period of constant steady-state release. Upon cessation of the addition of water vapor, a decline in the release to prehydrolysis values generally occurred. The release of stored fission gas was dependent on the square of the partial pressure of water vapor. The ratio of the constant steady-state release to the pre-hydrolysis value was independent of the partial pressure of water vapor. The time constant for the decline in the release was the same in all of the hydrolysis tests. RP MYERS, BF (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 6 TC 1 Z9 1 U1 1 U2 2 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 MAR PY 1992 VL 75 IS 3 BP 686 EP 693 DI 10.1111/j.1151-2916.1992.tb07859.x PG 8 WC Materials Science, Ceramics SC Materials Science GA HJ063 UT WOS:A1992HJ06300030 ER PT J AU VANBERKEL, GJ MCLUCKEY, SA GLISH, GL AF VANBERKEL, GJ MCLUCKEY, SA GLISH, GL TI UNIMOLECULAR AND COLLISION-INDUCED REACTIONS OF DOUBLY CHARGED PORPHYRINS SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID IONS AB Results from a tandem mass spectrometry (MS/MS) study, obtained with a reverse-geometry mass spectrometer, of the unimolecular and collision-induced reactions of doubly charged free-base and metal containing alkyl-substituted porphyrins formed by electron ionization are reported. These doubly charged porphyrin ions dissociate to yield both singly and doubly charged product ions via a number of reactions. This article classifies the major reactions observed, illustrating each with the appropriate spectra. Supplementary data from the same porphyrins, acquired with a tandem quadrupole MS/MS instrument, are also presented. The potential utility of some of these reactions as new methods for porphyrin analysis is discussed. RP VANBERKEL, GJ (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 17 TC 17 Z9 17 U1 0 U2 5 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 MAR PY 1992 VL 3 IS 3 BP 235 EP 242 PG 8 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA HM604 UT WOS:A1992HM60400007 PM 24242946 ER PT J AU FARMER, JC WANG, FT HAWLEYFEDDER, RA LEWIS, PR SUMMERS, LJ FOILES, L AF FARMER, JC WANG, FT HAWLEYFEDDER, RA LEWIS, PR SUMMERS, LJ FOILES, L TI ELECTROCHEMICAL TREATMENT OF MIXED AND HAZARDOUS WASTES - OXIDATION OF ETHYLENE-GLYCOL AND BENZENE BY SILVER (II) SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ORGANIC-COMPOUNDS; ANODE NITRATION; CONCURRENT NITRATION; AROMATIC NITRATION; NITRIC-ACID; KINETICS; MEDIA; MECHANISMS; AG(II) AB In the future, mediated electrochemical oxidation (MEO) may be used for the ambient temperature destruction of hazardous waste and for the conversion of mixed waste to low-level radioactive waste. We have studied the MEO of ethylene glycol and benzene, two model compounds, in an electrochemical reactor. The reactor had a rotating-cylinder anode that was operated well below the limiting current for Ag(II) generation. Rates of CO2 generation were measured and used to calculate both destruction and current efficiencies for the process. Gas chromatography with mass spectrometry (GC/MS) was used to identify several reaction intermediates. A simple model was developed to predict the time dependence of CO2 evolution. RP FARMER, JC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 35 TC 94 Z9 94 U1 0 U2 9 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 MAR PY 1992 VL 139 IS 3 BP 654 EP 662 DI 10.1149/1.2069280 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HH077 UT WOS:A1992HH07700005 ER PT J AU URIBE, FA SPRINGER, TE GOTTESFELD, S AF URIBE, FA SPRINGER, TE GOTTESFELD, S TI A MICROELECTRODE STUDY OF OXYGEN REDUCTION AT THE PLATINUM/RECAST-NAFION FILM INTERFACE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID GAS PERMEATION; FUEL-CELLS; SPE METHOD; KINETICS; ELECTROLYTE; VOLTAMMETRY; ACID AB We describe a study of the oxygen reduction kinetics at the Pt/recast Nafion(R) interface employing a minicell based on a filmed microelectrode. The experimental conditions are identical to those in polymer-electrolyte fuel cells in that the recast ionomer electrolyte is exposed only to water vapor. We find that the interfacial rate of oxygen reduction near 0.9 V is similar for the Pt/recast ionomer interface and for Pt immersed in dilute aqueous acid solutions. A significant loss of oxygen reduction activity occurs when the recast ionomer electrolyte loses water. We discuss a possible evaluation of catalyst utilization in polymer electrolyte fuel cells. RP URIBE, FA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,ELECTR RES GRP,LOS ALAMOS,NM 87545, USA. RI Bueno, Ligia/P-1359-2014 NR 27 TC 98 Z9 102 U1 1 U2 14 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 MAR PY 1992 VL 139 IS 3 BP 765 EP 773 DI 10.1149/1.2069299 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HH077 UT WOS:A1992HH07700024 ER PT J AU VITT, JE JOHNSON, DC AF VITT, JE JOHNSON, DC TI THE IMPORTANCE OF ANODIC DISCHARGE OF H2O IN ANODIC OXYGEN-TRANSFER REACTIONS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID LEAD DIOXIDE; ELECTROCATALYSIS; ELECTRODES; HCIO4 AB Difference voltammetry at rotated disk electrodes was applied to a study of several anodic. O-transfer reactions that appear to occur concurrently with O2 evolution. This voltammetric technique was useful for extracting the rotation-dependent component of the total current from the large, virtually rotation-independent current for O2 evolution. Data for oxidation of I- at Pt, Au, Pd, Ir, and glassy carbon electrodes show that the E1/2 for IO3- production is correlated with the overpotential for O2 evolution at these electrode materials. Data obtained at an Ir electrode for various reactions with widely varying E(o) values reveal uniform E1/2 values closely correlated with the potential for onset of O2 evolution in both alkaline and acidic solutions. The results support the conclusion that the anodic discharge of H2O is a prerequisite of these anodic O-transfer mechanisms. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP VITT, JE (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 18 TC 76 Z9 78 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 MAR PY 1992 VL 139 IS 3 BP 774 EP 778 DI 10.1149/1.2069300 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HH077 UT WOS:A1992HH07700025 ER PT J AU WARREN, WL POINDEXTER, EH OFFENBERG, M MULLERWARMUTH, W AF WARREN, WL POINDEXTER, EH OFFENBERG, M MULLERWARMUTH, W TI PARAMAGNETIC POINT-DEFECTS IN AMORPHOUS-SILICON DIOXIDE AND AMORPHOUS-SILICON NITRIDE THIN-FILMS .1. A-SIO2 SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTRON-SPIN-RESONANCE; SI-29 HYPERFINE-STRUCTURE; HIGH-PURITY SILICA; E' CENTERS; VITREOUS-SILICA; CRYSTALLINE QUARTZ; SI/SIO2 INTERFACE; OXYGEN VACANCY; FUSED-SILICA; GLASSY SIO2 AB In this paper we review and examine paramagnetic point defects in thin film amorphous silicon dioxide (a-SiO2), which is an important insulating material in modern electronic devices. Findings unique to thin films are compared with results from bulk materials to yield a picture of the structural, physical, chemical, and electronic nature of the defect centers. The most important defect in a-SiO2 is emphasized, the trivalent silicon moiety termed the E' center. We examine the types of E' centers observed in radiation or injection damaged thermal oxides, ion sputtered oxides, plasma enhanced chemical vapor deposited oxides, ion implanted thermal oxides, plastically densified silica, fused silicas, and high surface area sol-gel oxides. The nature of the precursor moieties, and their electrical charging phenomena are discussed. The different varieties of E' centers are categorized, and the reliability of their distinct existence and classification is assessed. C1 USA,ELECTR TECHNOL & DEVICES LAB,FT MONMOUTH,NJ 07703. RHEIN WESTFAL TH AACHEN,INST SEMICOND ELECTR,W-5100 AACHEN,GERMANY. UNIV MUNSTER,INST PHYS CHEM,W-4400 MUNSTER,GERMANY. RP WARREN, WL (reprint author), SANDIA NATL LABS,DIV ELECTR CERAM,ALBUQUERQUE,NM 87185, USA. NR 81 TC 99 Z9 99 U1 0 U2 12 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 MAR PY 1992 VL 139 IS 3 BP 872 EP 880 DI 10.1149/1.2069318 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HH077 UT WOS:A1992HH07700043 ER PT J AU WARREN, WL KANICKI, J RONG, FC POINDEXTER, EH AF WARREN, WL KANICKI, J RONG, FC POINDEXTER, EH TI PARAMAGNETIC POINT-DEFECTS IN AMORPHOUS-SILICON DIOXIDE AND AMORPHOUS-SILICON NITRIDE THIN-FILMS .2. A-SINX-H SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DANGLING-BOND CENTERS; SI-29 HYPERFINE-STRUCTURE; PLASMA-DEPOSITED FILMS; LESS-THAN 1.2; ELECTRONIC-PROPERTIES; CORRELATION-ENERGY; CRYSTALLINE SIO2; 1ST OBSERVATION; MEMORY TRAPS; E' CENTER AB In this paper we review paramagnetic point defects in amorphous silicon nitride thin films. We will discuss two intrinsic paramagnetic defects: a trivalent silicon center, named the K-center, and the recently observed nitrogen dangling-bond center. We examine the structural identification, and the electronic properties of the K-center, as well as consider why a-SiNx:H is generally a very effective charge trapping dielectric. In addition, this paper compares and contrasts special features of the structure and electronic role of the paramagnetic point defects in both silicon dioxide and silicon nitride thin films; this may provide insight for further studies on the physics and chemistry of these dangling-bond centers in both materials. C1 IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. USA,ELECTR TECHNOL & DEVICES LAB,FT MONMOUTH,NJ 07703. RP WARREN, WL (reprint author), SANDIA NATL LABS,DIV ELECTR CERAM,ALBUQUERQUE,NM 87185, USA. NR 70 TC 79 Z9 79 U1 0 U2 6 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 MAR PY 1992 VL 139 IS 3 BP 880 EP 889 DI 10.1149/1.2069319 PG 10 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HH077 UT WOS:A1992HH07700044 ER PT J AU FALABELLA, S SANDERS, DM AF FALABELLA, S SANDERS, DM TI COMPARISON OF 2 FILTERED CATHODIC ARC SOURCES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A LA English DT Article ID TOROIDAL PLASMA GUIDE; FLUX MOTION; VACUUM ARCS; SPOTS AB Cathodic arcs produce a highly ionized metal vapor which has proven useful in the production of dense, adherent coatings. For many applications, the macroparticles normally produced by the cathodic arc are unacceptable and must be filtered out. We have developed two filtered cathodic arc sources which have distinctly different operational characteristics. One of these makes use of so-called "steered arc" magnetic control of the arc trajectory, while the other employs a different form of arc control. The ion transmission efficiencies of these sources were improved by carrying a portion of the arc electron current through the filter. RP UNIV CALIF LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. NR 16 TC 41 Z9 43 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0734-2101 EI 1520-8559 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A PD MAR-APR PY 1992 VL 10 IS 2 BP 394 EP 397 DI 10.1116/1.578062 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HK010 UT WOS:A1992HK01000022 ER PT J AU ZHU, XY WHITE, JM CREIGHTON, JR AF ZHU, XY WHITE, JM CREIGHTON, JR TI A HIGH-RESOLUTION ELECTRON-ENERGY LOSS SPECTROSCOPY STUDY OF TRIMETHYLGALLIUM DECOMPOSITION ON GALLIUM RICH GAAS(100) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID ATOMIC LAYER EPITAXY; GAAS; TRIETHYLGALLIUM; CHEMISORPTION; SURFACE AB The adsorption and decomposition of trimethylgallium (TMGa) on the gallium rich (4 x 6) and (1 x 6) GaAs(100) surfaces have been studied by high resolution electron energy loss spectroscopy (HREELS), in conjunction with temperature-programmed desorption, x-ray photoelectron spectroscopy, and low energy electron diffraction. TMGa adsorbs molecularly at 108 K and dissociates above 200 K to form monomethylgallium (MMGa) and, possibly, some dimethylgallium surface species. Above 400 K, MMGa dominates. Surface MMGa remains stable until 650 K, above which temperature methyl radicals desorb. HREELS results showed unambiguously that methyl groups remain intact throughout the thermal decomposition of TMGa on GaAs(100). The effect of UV photons on both surface TMGa and MMGa has also been investigated, but no photochemistry was observed at wavelengths longer than 230 nm. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ZHU, XY (reprint author), UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712, USA. NR 14 TC 27 Z9 27 U1 2 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAR-APR PY 1992 VL 10 IS 2 BP 316 EP 320 DI 10.1116/1.578083 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HK010 UT WOS:A1992HK01000010 ER PT J AU GALUSKA, AA AF GALUSKA, AA TI CU/PI AND CU/PET ADHESION - INFLUENCE OF SI+ ION MIXING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID NI FILMS; KR-84+ IMPLANTATION; SI-28+ IMPLANTATION; ENHANCEMENT; POLYESTER; ESCA AB The adhesion and interfacial chemistry of 50 nm Cu films on poly[N,N- (p,p'-oxydiphenylene) pyromellitimide] (PI) and poly(ethylene terephthalate) (PET) substrates were examined as a function of Si-28+ implantation through the interfaces. The implantation was performed with 70 keV Si-28+ to doses between 1 and 10 x 10(16) Si/cm2, while the substrate temperature was kept between 50 and 80-degrees-C. The implantation induced extensive interfacial mixing and interfacial chemistry changes in both the Cu/PI and Cu/PET specimens. X-ray photoelectron spectroscopy analysis of the ion-induced Cu/PI interfacial chemistry indicated that the implanted Si-28+ had reacted with both the film substrate species to form Cu-Si, Si-O, and Si-C bonding, which suggested the formation of interfacial complexes, such as Cu-Si-C and Cu-Si-O-C. Similar interfacial chemistry was produced in the Cu/PET specimens by the implantation. However, additional Cu 2p3/2 and O 1s peaks associated with Cu-O-Si bonding were observed, suggesting the formation of Cu-O-Si-C interfacial complexes. Despite these changes in interfacial chemistry, only small (factor of 2) changes in adhesion were observed upon scratch testing. The absence of larger adhesion increases was attributed to the rather weak bonding between Cu and Si. RP GALUSKA, AA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 23 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAR-APR PY 1992 VL 10 IS 2 BP 381 EP 387 DI 10.1116/1.578060 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HK010 UT WOS:A1992HK01000020 ER PT J AU FLYNNSANDERS, DK CHANG, SL THIEL, PA IMBIHL, R AF FLYNNSANDERS, DK CHANG, SL THIEL, PA IMBIHL, R TI METHOD FOR RECOATING PHOSPHOR ON COMMERCIAL LOW-ENERGY ELECTRON-DIFFRACTION OPTICS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Note AB We describe a method for applying a new coat of phosphor to a commercial low-energy electron diffraction screen. The method is based on sedimentation of a phosphor suspension onto the screen. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. MAX PLANCK GESELL,FRITZ HABER INST,W-1000 BERLIN 33,GERMANY. NR 5 TC 3 Z9 3 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAR-APR PY 1992 VL 10 IS 2 BP 413 EP 415 DI 10.1116/1.578068 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HK010 UT WOS:A1992HK01000028 ER PT J AU SILVESTRE, P HAFICH, MJ VOGT, T NANDA, A ROBINSON, GY DUDLEY, JJ BOWERS, JE JONES, KM ALJASSIM, MM AF SILVESTRE, P HAFICH, MJ VOGT, T NANDA, A ROBINSON, GY DUDLEY, JJ BOWERS, JE JONES, KM ALJASSIM, MM TI GAS-SOURCE MOLECULAR-BEAM EPITAXIAL-GROWTH OF INGAASP FOR 1.3-MU-M DISTRIBUTED BRAGG REFLECTORS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON MOLECULAR-BEAM EPITAXY CY SEP 16-18, 1991 CL UNIV TEXAS AUSTIN, AUSTIN, TX SP AMER VACUUM SOC HO UNIV TEXAS AUSTIN AB High-quality InGaAsP films were grown on (100) InP substrates by gas-source molecular-beam epitaxy for use in distributed Bragg reflectors (DBR) operating at the wavelengths of 1.1-1.4-mu-m. By adjusting the inlet pressures of the feedstock gases AsH3 and PH3, precise control of the InGaAsP film composition was reproductively obtained, as evidenced by lattice mismatch of less-than-or-equal-to 5 x 10(-4) and band-gap wavelength variation of less-than-or-equal-to 10 nm. The InGaAsP films exhibited x-ray diffraction peak widths as small as 21 arcsec and a low-temperature photoluminescence peak width of 4.6 meV. Using 35.5 periods of alternating quarter wavelength layers of InGaAsP (1.15-mu-m composition) and InP, a DBR with a maximum reflectivity of 96 +/- 2% at the wavelength of 1.31-mu-m is demonstrated. C1 COLORADO STATE UNIV,CTR OPTOELECTR COMP SYST,FT COLLINS,CO 80523. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP SILVESTRE, P (reprint author), COLORADO STATE UNIV,DEPT ELECT ENGN,FT COLLINS,CO 80523, USA. RI Bowers, John/B-3486-2012 OI Bowers, John/0000-0003-4270-8296 NR 10 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1992 VL 10 IS 2 BP 956 EP 958 DI 10.1116/1.586099 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HN270 UT WOS:A1992HN27000088 ER PT J AU KRAJCSI, P TOLLEFSON, AE ANDERSON, CW WOLD, WSM AF KRAJCSI, P TOLLEFSON, AE ANDERSON, CW WOLD, WSM TI THE ADENOVIRUS-E3 14.5-KILODALTON PROTEIN, WHICH IS REQUIRED FOR DOWN-REGULATION OF THE EPIDERMAL GROWTH-FACTOR RECEPTOR AND PREVENTION OF TUMOR-NECROSIS-FACTOR CYTOLYSIS, IS AN INTEGRAL MEMBRANE-PROTEIN ORIENTED WITH ITS C-TERMINUS IN THE CYTOPLASM SO JOURNAL OF VIROLOGY LA English DT Article ID E3 TRANSCRIPTION UNIT; REGION E3; ENDOPLASMIC-RETICULUM; SIGNAL SEQUENCE; MESSENGER-RNA; INFECTED-CELLS; E3/19K PROTEIN; LYMPHOCYTES-T; MW PROTEIN; IDENTIFICATION AB We previously reported that the adenovirus type 5 E3 14.5-kilodalton protein (14.5K) forms a complex with E3 10.4K and that both proteins are required to down-regulate the epidermal growth factor receptor in adenovirus-infected human cells. Both proteins are also required to prevent cytolysis by tumor necrosis factor of most mouse cell lines infected by adenovirus mutants that lack E3 14.7K. The E3 14.5K amino acid sequence suggests that 14.5K is an integral membrane protein with an N-terminal signal sequence for membrane insertion. Here we show that 14.5K was found exclusively in cytoplasmic membrane fractions. Radiochemical sequencing of 14.5K indicated that the N-terminal signal sequence is cleaved predominantly between Cys-18 and Ser-19. With a mutant that does not express 10.4K, cleavage occurs predominantly between Phe-17 and Cys-18, indicating that the presence or absence of 10.4K affects the signal cleavage site. 14.5K was extracted into the detergent phase with Triton X-114, it remained associated with membranes after extraction with Na2CO3 at pH 11.5, and it was partially protected by membranes from proteinase K digestion; these observations indicate that 14.5K is an integral membrane protein. Proteinase K digestion followed by immunoprecipitation with antipeptide antisera directed against the N or C terminus of mature 14.5K indicated that 14.5K is oriented in the membrane with its N terminus in the lumen and its C terminus in the cytoplasm. Thus, 14.5K is a type I bitopic membrane protein. Previous studies indicated that 10.4K is also an integral membrane protein oriented with its C terminus in the cytoplasm. Altogether, these findings suggest that cytoplasmic membranes are the site of action when 10.4K and 14.5K down-regulate the epidermal growth factor receptor and prevent tumor necrosis factor cytolysis. C1 ST LOUIS UNIV,SCH MED,INST MOLEC VIROL,3681 PK AVE,ST LOUIS,MO 63110. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NCI NIH HHS [CA48219, CA24710] NR 47 TC 26 Z9 28 U1 0 U2 0 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 MAR PY 1992 VL 66 IS 3 BP 1665 EP 1673 PG 9 WC Virology SC Virology GA HD265 UT WOS:A1992HD26500045 PM 1531370 ER PT J AU LIDICKER, WZ WOLFF, JO LIDICKER, LN SMITH, MH AF LIDICKER, WZ WOLFF, JO LIDICKER, LN SMITH, MH TI UTILIZATION OF A HABITAT MOSAIC BY COTTON RATS DURING A POPULATION DECLINE SO LANDSCAPE ECOLOGY LA English DT Article DE SIGMOON-HISPIDUS; HABITAT MOSAIC; SEX-AGE COHORTS; SURVIVORSHIP; DENSITY DECLINE; LANDSCAPE; POPULATION DYNAMICS; ELECTROMORPHS AB This study describes the demographic features of a population of Sigmodon hispidus utilizing the habitat mosaic provided by a Carolina Bay on the Atlantic coastal plain of South Carolina. A total of 71 cotton rats were captured 160 times on a 4 ha grid during a winter decline from 25/ha to less that 1/ha. Body weights of adults declined until early February and then increased; those of subadults grew very slowly until February followed by a spurt in growth. Weight gain did not differ between survivors and non-survivors for males, but female survivors gained 1.5 g per week more than non-survivors. Female subadults exhibited higher mortality early in the decline and males later. Adult females were randomly distributed across 8 microhabitats, whereas adult males were almost exclusively confined to heavy Rubus cover. Subadult males used wet sites more than any other cohort; subadult females were widely distributed urising drier sites most frequently. By the end of the decline, all survivors were localized in Rubus-dominated patches. No statistically significant changes in electromorph genotypes or allele frequencies were detected, but survivors had a higher frequency of the F-allele at the adenylate kinase locus than did non-survivors (42.3% vs. 16.7%). Our findings affirm the importance of a landscape perspective in understanding the population dynamics of cotton rats, and show how a habitat mosaic influences survival differentially among sex-age cohorts. C1 UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. RP LIDICKER, WZ (reprint author), UNIV CALIF BERKELEY, MUSEUM VERTEBRATE ZOOL, BERKELEY, CA 94720 USA. NR 0 TC 15 Z9 16 U1 0 U2 3 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0921-2973 J9 LANDSCAPE ECOL JI Landsc. Ecol. PD MAR PY 1992 VL 6 IS 4 BP 259 EP 268 DI 10.1007/BF00129704 PG 10 WC Ecology; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA HK278 UT WOS:A1992HK27800005 ER PT J AU ANNIS, BK NOID, DW SUMPTER, BG REFFNER, JR WUNDERLICH, B AF ANNIS, BK NOID, DW SUMPTER, BG REFFNER, JR WUNDERLICH, B TI APPLICATION OF ATOMIC FORCE MICROSCOPY (AFM) TO A BLOCK COPOLYMER AND AN EXTENDED CHAIN POLYETHYLENE SO MAKROMOLEKULARE CHEMIE-RAPID COMMUNICATIONS LA English DT Article C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP ANNIS, BK (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 3 TC 14 Z9 14 U1 0 U2 1 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4, CH-4052 BASEL, SWITZERLAND SN 0173-2803 J9 MAKROMOL CHEM-RAPID PD MAR PY 1992 VL 13 IS 3 BP 169 EP 172 PG 4 WC Polymer Science SC Polymer Science GA HL026 UT WOS:A1992HL02600006 ER PT J AU COWGILL, MG AF COWGILL, MG TI INTRODUCING THE AUTHORS AND THE SPECIAL FEATURE ON SURFACE-COATINGS SO MATERIALS CHARACTERIZATION LA English DT Editorial Material RP COWGILL, MG (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD MAR PY 1992 VL 28 IS 2 BP 87 EP 88 DI 10.1016/1044-5803(92)90031-C PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA HK748 UT WOS:A1992HK74800001 ER PT J AU THOMAS, LE EINZIGER, RE AF THOMAS, LE EINZIGER, RE TI GRAIN-BOUNDARY OXIDATION OF PRESSURIZED-WATER REACTOR SPENT FUEL IN AIR SO MATERIALS CHARACTERIZATION LA English DT Article AB The grain boundary oxidation of pressurized-water reactor spent fuel in a dry air atmosphere at 195-degrees-C was investigated by light optical and scanning electron microscopy (SEM). The oxidation occurred by U4O9 formation along the grain boundaries and was visible by anomalous electron backscattering in the SEM. Image analysis of samples oxidized to a bulk oxygen-to-uranium ratio of 2.16 indicated U4O9 penetration into the prior UO2 grains at a rate of 4.7 nm/hour. RP THOMAS, LE (reprint author), PACIFIC NW LAB, MAIL STOP P7-14,POB 999, RICHLAND, WA 99352 USA. NR 16 TC 14 Z9 14 U1 1 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD MAR PY 1992 VL 28 IS 2 BP 149 EP 156 DI 10.1016/1044-5803(92)90038-J PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA HK748 UT WOS:A1992HK74800008 ER PT J AU GORETTA, KC WU, W WU, CT XU, D YOUNGDAHL, CA SHI, D SINGH, JP PICCIOLO, JJ LANAGAN, MT HULL, JR DUSEK, JT DORRIS, SE CHEN, N BIONDO, AC BALACHANDRAN, U POEPPEL, RB AF GORETTA, KC WU, W WU, CT XU, D YOUNGDAHL, CA SHI, D SINGH, JP PICCIOLO, JJ LANAGAN, MT HULL, JR DUSEK, JT DORRIS, SE CHEN, N BIONDO, AC BALACHANDRAN, U POEPPEL, RB TI HIGH-TC SUPERCONDUCTORS - FABRICATING TECHNOLOGIES AND FUTURE PERSPECTIVES SO MATERIALS CHEMISTRY AND PHYSICS LA English DT Article; Proceedings Paper CT 2ND WORKSHOP ON THE BASIC AND APPLIED ASPECTS OF RARE EARTHS CY MAY 09-10, 1992 CL VENICE, ITALY SP EUROPEAN RARE EARTH & ACTINIDE SOC, ENTE NAZL ENERGIA NUCL & ENERGIE ALTERNAT, CNR ID CRITICAL CURRENT-DENSITY; CU-O SUPERCONDUCTORS; MELT-GROWTH-PROCESS; YBA2CU3OX; WIRES; FILAMENT; SILVER AB Processing methods for production of bulk high-T(c) superconductors are reviewed. Conductors made by conventional forming and sintering methods can generally carry only small current densities. Melting and powder-in-tube methods yield superior conductors, but further improvements are necessary before these superconductors can be employed in most large-scale applications. RP GORETTA, KC (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 36 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 0254-0584 J9 MATER CHEM PHYS JI Mater. Chem. Phys. PD MAR-APR PY 1992 VL 31 IS 1-2 BP 73 EP 78 DI 10.1016/0254-0584(92)90155-2 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA HQ962 UT WOS:A1992HQ96200013 ER PT J AU SCHILDBACH, MA TENCH, RJ BALOOCH, M SIEKHAUS, WJ AF SCHILDBACH, MA TENCH, RJ BALOOCH, M SIEKHAUS, WJ TI SCANNING TUNNELING MICROSCOPE OBSERVATIONS OF PULSED LASER MODIFICATION OF THE BASAL-PLANE OF GRAPHITE SO MATERIALS LETTERS LA English DT Article AB Scanning tunneling microscopy has been used to investigate changes in the morphology of the basal plane of graphite after exposure to 7 ns, 1064 nm laser pulses in air. Damage appears first on step edges and consists of exfoliation of graphite layers. Results indicate that a process other than oxidation is responsible. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV CONDENSED MATTER & ANALYT SCI,LIVERMORE,CA 94550. RP SCHILDBACH, MA (reprint author), UNIV CALIF DAVIS LIVERMORE,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 15 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD MAR PY 1992 VL 13 IS 2-3 BP 169 EP 173 DI 10.1016/0167-577X(92)90132-4 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HN039 UT WOS:A1992HN03900022 ER PT J AU KHACHATURYAN, AG SHAPIRO, SM SEMENOVSKAYA, S AF KHACHATURYAN, AG SHAPIRO, SM SEMENOVSKAYA, S TI ADAPTIVE PHASE IN MARTENSITIC-TRANSFORMATION SO MATERIALS TRANSACTIONS JIM LA English DT Article DE MARTENSITE; HABIT PLANE; ACCOMMODATION STRAIN; NUCLEATION; STACKING FAULTS; INCOMMENSURATE STRUCTURES ID CRYSTAL-STRUCTURE; ALLOY AB It is shown that an adaptive transient phase can be formed along the martensitic transformation path to overcome thermodynamic and nucleation barriers caused by the transformation strain. A possible role of the adaptive phase in the thermal nucleation of the martensite is discussed. The structure of the adaptive phase is predicted from the strain accommodation condition. An example of the cubic --> tetragonal transformation is considered. The crystal lattice parameters of the adaptive phase are expressed through those of the parent cubic phase and tetragonal normal martensite. It is shown that the 7R martensite in beta'NiAl alloys is an example of the adaptive martensite. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KHACHATURYAN, AG (reprint author), RUTGERS STATE UNIV,DEPT MECH & MAT SCI,POB 909,PISCATAWAY,NJ 08855, USA. NR 15 TC 10 Z9 10 U1 0 U2 6 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD MAR PY 1992 VL 33 IS 3 BP 278 EP 281 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HT327 UT WOS:A1992HT32700018 ER PT J AU WIENKE, BR AF WIENKE, BR TI MODELING PHASE VOLUME CONSTRAINTS UNDER REPETITIVE DECOMPRESSION SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article ID GAS CAVITATION NUCLEI; AIR AB Extending the critical volume (separated phase) hypothesis in time integral form to repetitive decompressions, we show that reduced gradients following repetitive exposures are necessary in time, in any model, to maintain the separated nitrogen in tissue (bubbles) below a limit point. A realistic bubble model is then discussed, systematized, and applied to some marginal decompression profiles. The focus is permissible bubble excess, not dissolved gas per se, though reductions affect all compartments, fast and slow, requiring a systematic lowering of repetitive tensions. Deep repetitive and shallower multi-day exposures are impacted by the procedure. Within nucleation theory, deeper-than-first exposures are also treated. A set of exposure fractions, xi, accounting for micronuclei excitation and regeneration, reduced bubble elimination in repetitive activity and coupled effects on tissue tension is discussed, with xi representing a set of multiplicative factors (less than one) reducing critical parameters controlling exposures. These factors penalize repetitive activity between short time spans, deeper-than-previous and continuous multi-day activities, compared to standard algorithms using a fixed slow compartment. Within the approach, fast compartments, controlling deeper exposures, are impacted the most, but slow compartments are also affected. RP WIENKE, BR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 27 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD MAR PY 1992 VL 16 IS 3 BP 109 EP 120 DI 10.1016/0895-7177(92)90052-M PG 12 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA HJ530 UT WOS:A1992HJ53000011 ER PT J AU MASSOUDI, M RAMEZAN, M AF MASSOUDI, M RAMEZAN, M TI HEAT-TRANSFER ANALYSIS OF A VISCOELASTIC FLUID AT A STAGNATION POINT SO MECHANICS RESEARCH COMMUNICATIONS LA English DT Article ID NON-NEWTONIAN FLUID; 2ND-ORDER FLUID; CREEPING FLOW C1 BURNS & ROE SERV CORP,PITTSBURGH,PA 15236. RP MASSOUDI, M (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 18 TC 18 Z9 18 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0093-6413 J9 MECH RES COMMUN JI Mech. Res. Commun. PD MAR-APR PY 1992 VL 19 IS 2 BP 129 EP 134 DI 10.1016/0093-6413(92)90037-B PG 6 WC Mechanics SC Mechanics GA HB577 UT WOS:A1992HB57700006 ER PT J AU ANDERSON, JP CHEN, H EPPERSON, JE AF ANDERSON, JP CHEN, H EPPERSON, JE TI THE SHORT-RANGE ORDER STRUCTURE OF A WATER-QUENCHED NI-12.5 AT PCT SI ALLOY - A SYNCHROTRON X-RAY DIFFUSE-SCATTERING STUDY SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID SUPERSATURATED SOLID-SOLUTION; PERCENT-AL-ALLOY; PHASE-SEPARATION; NONORTHOGONAL PROBLEMS; RIDGE REGRESSION; PRECIPITATION; DIFFRACTION; KINETICS AB A wide-angle X-ray diffuse scattering measurement of a water-quenched Ni-12.5 at. pct Si alloy single crystal was performed using synchrotron radiation. The Cowley-Warren short-range order (SRO) parameters and static displacement terms between atom pairs were obtained. The first seven SRO parameters were fitted in an 8000-atom model, from which it was deduced that no ordered gamma' domains existed in the water-quenched structure, but an enhancement of the C16 and C17 nearest-neighbor configurations did occur as compared to a completely random model. The C16 configuration is the basic structural unit of the L1(2) ordered structure, and the C17 may be thought of as a faulted variant thereof. These results were confirmed by performing equivalent SRO modeling in a 140,608-atom model. Silicon-silicon nearest neighbors show a repulsive strain of approximately 12 pct, while Ni-Ni pairs contract by less than 1 pct. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ANDERSON, JP (reprint author), UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801, USA. NR 38 TC 8 Z9 8 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 769 EP 777 DI 10.1007/BF02675554 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400005 ER PT J AU HAMILTON, JC YANG, NYC CLIFT, WM BOEHME, DR MCCARTY, KF FRANKLIN, JE AF HAMILTON, JC YANG, NYC CLIFT, WM BOEHME, DR MCCARTY, KF FRANKLIN, JE TI DIFFUSION MECHANISMS IN CHEMICAL VAPOR-DEPOSITED IRIDIUM COATED ON CHEMICAL VAPOR-DEPOSITED RHENIUM SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article AB Materials used for radiation-cooled rocket thrusters must be capable of surviving under extreme conditions of high temperatures and oxidizing environments. While combustion efficiency is maximized at high temperature, many refractory metals are unsuitable for thruster service due to rapid materials loss caused by volatile oxides. The Aerojet Propulsion Division has developed thruster chambers using chemical vapor-deposited (CVD) Re coated with CVD Ir on the inside surface which is exposed to hot combustion gases. Iridium serves as an oxidation barrier protecting the Re which maintains structural integrity at high temperatures. In order to predict and extend the performance limits of these Ir-coated Re thrusters, we are studying the diffusion kinetics of CVD materials at temperature. Thruster end ring sections were examined using electron microprobe analysis both before and after exposure to high-temperature vacuum environments. The resulting elemental maps for Re, Ir, and Mo in the near-surface region allow identification of diffusion mechanisms operating at these temperatures. Line scans for Ir and Re were fit using a diffusion model to extract relevant diffusion constants. The fastest diffusion process is seen to be grain-boundary diffusion, with Re diffusing down grain boundaries in the Ir overlayer. The measured dependence of the diffusion rate on temperature will allow prediction of operating lifetimes for these thrusters. C1 AEROJET PROP DIV,SACRAMENTO,CA. RP HAMILTON, JC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 3 TC 34 Z9 36 U1 0 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 851 EP 855 DI 10.1007/BF02675562 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400013 ER PT J AU MEI, Z SUNWOO, AJ MORRIS, JW AF MEI, Z SUNWOO, AJ MORRIS, JW TI ANALYSIS OF LOW-TEMPERATURE INTERMETALLIC GROWTH IN COPPER-TIN DIFFUSION COUPLES SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID COMPOUND GROWTH; SOLDERABILITY AB A multiphase diffusion model was constructed and used to analyze the growth of the epsilon- and eta-phase intermetallic layers at a plane Cu-Sn interface in a semi-infinite diffusion couple. Experimental measurements of intermetallic layer growth were used to compute the interdiffusivities in the epsilon and eta phases and the positions of the interfaces as a function of time. The results suggest that interdiffusion in the epsilon phase (D(epsilon) approximately) is well fit by an Arrhenius expression with D0 = 5.48 x 10(-9) m2/s and Q = 61.9 kJ/mole, while that in the eta phase (D(eta) approximately) has D0 = 1.84 x 10(-9) m2/s and Q = 53.9 kJ/mole. These values are in reasonable numerical agreement with previous results. The higher interdiffusivity in the eta phase has the consequence that the eta phase predominates in the intermetallic bilayer. However, the lower activation energy for interdiffusion in the eta phase has the result that the epsilon phase fills an increasing fraction of the intermetallic layer at higher temperature: at 20-degrees-C, the predicted epsilon-phase thickness is almost-equal-to 10 pct of that of eta, while at 200-degrees-C, its thickness is 66 pct of that of eta. In the absence of a strong Kirkendall effect, the original Cu-Sn interface is located within the eta-phase layer after diffusion. It lies near the midpoint of the eta-phase layer at higher temperature (220-degrees-C) and, hence, appears to shift toward the Sn side of the couple. The results are compared to experimental observations on intermetallic growth at solder-Cu interfaces. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MEI, Z (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 38 TC 180 Z9 182 U1 0 U2 31 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 857 EP 864 DI 10.1007/BF02675563 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400014 ER PT J AU HENSHALL, GA KASSNER, ME MCQUEEN, HJ AF HENSHALL, GA KASSNER, ME MCQUEEN, HJ TI DYNAMIC RESTORATION MECHANISMS IN AL-5.8 AT PCT MG DEFORMED TO LARGE STRAINS IN THE SOLUTE DRAG REGIME SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID ELEVATED-TEMPERATURES; SOLID-SOLUTION; STEADY-STATE; ALUMINUM; CREEP; DEFORMATION; ALLOYS; STRESS; MICROSTRUCTURE; EVOLUTION AB An Al-5.8 at. pct Mg (5.2 wt pct Mg) alloy was deformed in torsion within the solute drag regime to various strains, up to the failure strain of 10.8. Optical microscopy (OM) and transmission electron microscopy (TEM) were used to analyze the evolution of the microstructure and to determine the dynamic restoration mechanism. Transmission electron microscopy revealed that subgrain formation is sluggish but that subgrains eventually (epsilonBAR almost-equal-to 1) fill the grains. The "steady-state" subgrain size (lambda almost-equal-to 6-mu-m) and misorientation angle (THETA almost-equal-to 1.6 deg) are reached by epsilonBAR almost-equal-to 2. These observations confirm that subgrains eventually form during deformation in the solute drag regime, though they do not appear to significantly influence the strength. At low strains, nearly all of the boundaries form by dislocation reaction and are low angle (THETA < 10 deg). At a strain of 10.8, however, the boundary misorientation histogram is bimodal, with nearly 25 pct of the boundaries having high angles due to their ancestry in the original grain boundaries. This is consistent with OM observations of the elongation and thinning of the original grains as they spiral around the torsion axis. No evidence was found for discontinuous dynamic recrystallization, a repeating process in which strain-free grains nucleate, grow, deform, and give rise to new nuclei. It is concluded that dynamic recovery in the solute drag regime gives rise to geometric dynamic recrystallization in a manner very similar to that already established for pure aluminum, suggesting that geometric dynamic recrystallization may occur generally in materials with a high stacking-fault energy (SFE) deformed to large strains. C1 OREGON STATE UNIV,DEPT MECH ENGN,CORVALLIS,OR 97331. CONCORDIA UNIV,DEPT MECH ENGN,MONTREAL H3G 1M8,QUEBEC,CANADA. RP HENSHALL, GA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 34 TC 87 Z9 87 U1 0 U2 8 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 881 EP 889 DI 10.1007/BF02675565 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400016 ER PT J AU LOVATO, ML STOUT, MG AF LOVATO, ML STOUT, MG TI COMPRESSION TESTING TECHNIQUES TO DETERMINE THE STRESS-STRAIN BEHAVIOR OF METALS SUBJECT TO FINITE DEFORMATION SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article AB We have investigated techniques to conduct a valid single-increment compression experiment to large strains, epsilon almost-equal-to 1.0. Our investigation included experiments with many different lubricants, specimen-end geometries, five different materials, and temperatures of 22-degrees-C, 315-degrees-C, and 600-degrees-C. We found that for materials with a work-hardening exponent greater than 0.15 and a slightly positive strain-rate sensitivity, the best technique was to cut concentric grooves into the ends of the compression sample and to use polished platens and a molybdenum-disulfide grease-base lubricant. This technique gave valid stress/strain data and uniform displacement fields (as determined by metallography of the deformed specimen cross sections). At all temperatures, satisfactory results were also obtained using a MOLYKOTE spray lubricant. We investigated both well-lubricated experimental conditions (the concentric specimen grooves and Molygrease lubrication and TEFLON sheet lubrication) as well as poor lubrication conditions. The poorest lubrication was achieved by using a set of platens which had grooves cut in them to prevent any expansion by the ends of the specimen during deformation. Up to a compressive strain of 0.5, the load/displacement data from all of these lubrication conditions were almost identical. This was the case for materials with a work-hardening exponent > 0.15. Despite the similarity of the "average" stress/strain data to epsilon = 0.5 for all lubrication conditions, metallographic cross sections showed that the deformation was nonuniform for the poorly lubricated experiments. The results of the experiments show that a single increment compression test can be used to obtain accurate constitutive behavior of many materials to large deformations, epsilon almost-equal-to 1.0. In addition, we have found that the compression test is relatively insensitive to lubrication conditions for many materials through moderate deformations, epsilon almost-equal-to 0.5. RP LOVATO, ML (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 25 Z9 25 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 935 EP 951 DI 10.1007/BF02675569 PG 17 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400020 ER PT J AU GORDON, JA HIRTH, JP KUMAR, AM MOODY, NE AF GORDON, JA HIRTH, JP KUMAR, AM MOODY, NE TI EFFECTS OF HYDROGEN ON THE MIXED-MODE I/III TOUGHNESS OF A HIGH-PURITY ROTOR STEEL SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID ASSISTED DUCTILE FRACTURE; PLASTIC SOLIDS; CARBON-STEELS; III FRACTURE; PLANE-STRAIN; 1090 STEEL; SHEAR; CRYSTALS; CRACKS AB J integral tests, both pure mode I and mixed mode I/III in character, were performed on a high-purity Ni-Cr-Mo-V rotor steel. The steel was tested in the uncharged condition and after gaseous charging with hydrogen to a level of 2 at. ppm. Hydrogen degraded the J integral toughness incrementally by approximately 30 pct with the degree of degradation increasing mode III loading component. The results are discussed in terms of a model in which, augmenting the effect of the mode III loading, hydrogen further increases the tendency for plastic instability in the form of shear bands. C1 WASHINGTON STATE UNIV,DEPT MECH & MAT ENGN,PULLMAN,WA 99164. SANDIA NATL LABS,TECH STAFF,LIVERMORE,CA 94550. RP GORDON, JA (reprint author), ADV SILICON MAT INC,MOSES LAKE,WA 98837, USA. NR 33 TC 58 Z9 58 U1 0 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 1013 EP 1020 DI 10.1007/BF02675576 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400027 ER PT J AU GOODS, SH YANG, NYC AF GOODS, SH YANG, NYC TI MICROSTRUCTURAL DAMAGE AND RESIDUAL MECHANICAL-PROPERTIES IN HELIUM-BEARING GAS METAL ARC WELDMENTS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID INTERGRANULAR CAVITY GROWTH; GRAIN-BOUNDARY CAVITIES; POWER-LAW CREEP; DIFFUSIVE CAVITATION; FRACTURE; TEMPERATURE; NUCLEATION AB The influence of entrapped helium on microstructural damage and residual mechanical properties subsequent to applying low-penetration gas metal arc (GMA) weld overlays was examined for an AISI Type 304 stainless steel. Two helium levels were examined: 22.5 and 85.0 atomic parts per million (appm) He. Detailed scanning electron microscopy (SEM) revealed the presence of intergranular cracks in the weld heat-affected zone (HAZ). The crack surfaces exhibited a dimple structure that was characteristic of a gas bubble embrittled material. Transmission electron microscopy (TEM) revealed that the size and spacing of the grain boundary helium gas bubbles remained virtually unchanged (relative to that established by the charging and aging procedure) at distances greater than 1 mm from the fusion line. Within this first millimeter, the diameter of the bubbles increased rapidly, and the bubble spacing increased to the characteristic spacing of the dimples that decorated weld-induced cracks. Mechanical testing revealed a loss in strain-to-fracture and ultimate tensile strength (UTS) at the higher helium level. While the majority of the fracture occurred in a transgranular, ductile manner, some deformation-induced intergranular cracking was observed. This cracking occurred over a very narrow region localized to the HAZ of the weldment. At the lower helium level, ductility and strength were unaffected compared to helium-free specimens. RP GOODS, SH (reprint author), SANDIA NATL LABS,DIV ENGN MAT,LIVERMORE,CA 94551, USA. NR 27 TC 13 Z9 13 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD MAR PY 1992 VL 23 IS 3 BP 1021 EP 1032 DI 10.1007/BF02675577 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA HG834 UT WOS:A1992HG83400028 ER PT J AU PHAM, HA TWIGG, DW AF PHAM, HA TWIGG, DW TI A NOTE ON THE VENN AND BEN DIAGRAMS SO MICROELECTRONICS AND RELIABILITY LA English DT Article AB Yellman introduced an alternative to the Venn diagram for mapping experiment state spaces, which he calls a Ben diagram. In this paper. Ben and Venn diagrams are generated and compared for two applications, a Hamming error correcting code and a set identity. C1 BOEING CO,SEATTLE,WA 98124. RP PHAM, HA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 4 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 0026-2714 J9 MICROELECTRON RELIAB JI Microelectron. Reliab. PD MAR PY 1992 VL 32 IS 3 BP 433 EP 437 DI 10.1016/0026-2714(92)90073-T PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GY717 UT WOS:A1992GY71700017 ER PT J AU DALE, TC KRNACIK, MJ SCHMIDHAUSER, C YANG, CLQ BISSELL, MJ ROSEN, JM AF DALE, TC KRNACIK, MJ SCHMIDHAUSER, C YANG, CLQ BISSELL, MJ ROSEN, JM TI HIGH-LEVEL EXPRESSION OF THE RAT WHEY ACIDIC PROTEIN GENE IS MEDIATED BY ELEMENTS IN THE PROMOTER AND 3' UNTRANSLATED REGION SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Article ID TISSUE-SPECIFIC EXPRESSION; TRANSGENIC MICE; GLOBIN GENE; CASEIN GENE; FUNCTIONAL-DIFFERENTIATION; BASEMENT-MEMBRANE; MOUSE; MILK; MORPHOGENESIS; SEQUENCES AB The high-level expression of the rat whey acidic protein (WAP) gene in transgenic mice depends on the interaction of 5'-flanking promoter sequences and intragenic sequences. Constructs containing 949 bp of promoter sequences and only 70 bp of 3'-flanking DNA were expressed at uniformly high levels, comparable to or higher than that of the endogenous gene. Although this WAP transgene was developmentally regulated, it was expressed earlier during pregnancy than was the endogenous WAP gene. Replacement of 3' sequences, including the WAP poly(A) addition site, with simian virus 40 late poly(A) sequences resulted in an approximately 20-fold reduction in the expression of WAP mRNA in the mammary gland during lactation. Nevertheless, position-independent expression of the transgene was still observed. Further deletion of 91 bp of conserved WAP 3' untranslated region (UTR) led to integration site-dependent expression. Position independence was restored following reinsertion of the WAP 3' UTR into the deleted construct at the same location, but only when the insertion was in the sense orientation. The marked differences observed between the expression levels of the 3'-end deletion constructs in transgenic mice were not seen in transfected CID 9 mammary epithelial cells. In these cells, expression of the endogenous WAP gene was dependent on the interaction of these cells with a complex extracellular matrix. In contrast, the transfected WAP constructs were not dependent on extracellular matrix for expression. Thus, both the abnormal expression of WAP in cells cultured on plastic and the precocious developmental expression of WAP in transgenic mice may reflect the absence of a negative control element(s) within these recombinant constructs. C1 BAYLOR COLL MED,DEPT CELL BIOL,HOUSTON,TX 77030. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. RI Dale, Trevor/D-3749-2009 OI Dale, Trevor/0000-0002-4880-9963 FU NCI NIH HHS [CA 16303] NR 38 TC 66 Z9 70 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0270-7306 J9 MOL CELL BIOL JI Mol. Cell. Biol. PD MAR PY 1992 VL 12 IS 3 BP 905 EP 914 PG 10 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA HE838 UT WOS:A1992HE83800001 PM 1545822 ER PT J AU WANG, Y KATO, T AYAKI, H ISHIZAKI, K TANO, K MITRA, S IKENAGA, M AF WANG, Y KATO, T AYAKI, H ISHIZAKI, K TANO, K MITRA, S IKENAGA, M TI CORRELATION BETWEEN DNA METHYLATION AND EXPRESSION OF O6-METHYLGUANINE-DNA METHYLTRANSFERASE GENE IN CULTURED HUMAN TUMOR-CELLS SO MUTATION RESEARCH LA English DT Article DE O6-METHYLGUANINE-DNA METHYLTRANSFERASE (MGMT); EXPRESSION OF MGMT GENE; DNA METHYLATION; HUMAN TUMOR CELL STRAINS; MER- PHENOTYPE ID O-6-ALKYLGUANINE-DNA ALKYLTRANSFERASE ACTIVITY; HUMAN O-6-METHYLGUANINE-DNA METHYLTRANSFERASE; ALKYLATING-AGENTS; ESCHERICHIA-COLI; HUMAN-BRAIN; REPAIR; STRAINS; SENSITIVITY; XENOGRAFTS; LINES AB Approximately 20% of human tumor cell strains are deficient in a DNA repair protein, O6-methylguanine-DNA methyltransferase (MGMT), and are called Mer- strains. In an attempt to determine the molecular basis for the extinction of MGMT expression in Mer- human cells, the distribution of DNA methylation sites in and around the exon sequences of the repair gene was compared in 6 Mer+ (repair-proficient) and 12 Mer- cell lines. Southern blot analysis of the genomic DNA digested with isoschizomeric restriction endonucleases MspI and HpaII to detect 5-methylcytosine in CCGG sequences indicated that the DNA of all the Mer+ cells but of none of the Mer- cells is heavily methylated in the exon-containing regions. The methylation pattern contradicts the general belief that inactive genes are hypermethylated compared to hypomethylation of transcriptionally active genes. It appears that the regulation of the MGMT gene in human cells is much more complex than simply dictated by its methylation level. C1 KYOTO UNIV,CTR RADIAT BIOL,YOSHIDAKONOE CHO,SAKYO KU,KYOTO 606,JAPAN. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. FU NCI NIH HHS [CA 31721] NR 35 TC 37 Z9 40 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD MAR PY 1992 VL 273 IS 2 BP 221 EP 230 DI 10.1016/0921-8777(92)90083-F PG 10 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA HH866 UT WOS:A1992HH86600013 PM 1372105 ER PT J AU LOHMAN, PHM MENDELSOHN, ML MOORE, DH WATERS, MD BRUSICK, DJ ASHBY, J LOHMAN, WJA AF LOHMAN, PHM MENDELSOHN, ML MOORE, DH WATERS, MD BRUSICK, DJ ASHBY, J LOHMAN, WJA TI A METHOD FOR COMPARING AND COMBINING SHORT-TERM GENOTOXICITY TEST DATA - THE BASIC SYSTEM SO MUTATION RESEARCH LA English DT Article DE SHORT-TERM GENOTOXICITY TEST DATA; WEIGHT-OF-EVIDENCE ANALYSIS; TESTING PARAMETERS, COMPARING; BRUSICK SCORING SYSTEM C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. US EPA,RES TRIANGLE PK,NC 27711. HAZELTON LABS AMER INC,VIENNA,VA 22180. ICI PLC,CENT TOXICOL LAB,MACCLESFIELD SK10 4TG,CHESHIRE,ENGLAND. RP LOHMAN, PHM (reprint author), LEIDEN UNIV,RADIAT GENET & CHEM MUTAGENESIS LAB,MGC,WASSENAARSEWEG 72,2333 AA LEIDEN,NETHERLANDS. NR 11 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD MAR PY 1992 VL 266 IS 1 BP 7 EP 25 DI 10.1016/0027-5107(92)90218-Q PG 19 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA HL059 UT WOS:A1992HL05900002 PM 1372964 ER PT J AU MOORE, DH MENDELSOHN, ML LOHMAN, PHM AF MOORE, DH MENDELSOHN, ML LOHMAN, PHM TI A METHOD FOR COMPARING AND COMBINING SHORT-TERM GENOTOXICITY TEST DATA - THE OPTIMAL USE OF DOSE INFORMATION SO MUTATION RESEARCH LA English DT Article DE SHORT-TERM GENOTOXICITY TEST DATA, COMPARING AND COMBINING; DOSE INFORMATION, OPTIMAL USE OF C1 LEIDEN UNIV,RADIAT GENET & CHEM MUTAGENESIS LAB,MGC,2300 RA LEIDEN,NETHERLANDS. RP MOORE, DH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 5507,LIVERMORE,CA 94550, USA. NR 4 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD MAR PY 1992 VL 266 IS 1 BP 27 EP 42 DI 10.1016/0027-5107(92)90219-R PG 16 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA HL059 UT WOS:A1992HL05900003 PM 1372962 ER PT J AU MENDELSOHN, ML MOORE, DH LOHMAN, PHM AF MENDELSOHN, ML MOORE, DH LOHMAN, PHM TI A METHOD FOR COMPARING AND COMBINING SHORT-TERM GENOTOXICITY TEST DATA - RESULTS AND INTERPRETATION SO MUTATION RESEARCH LA English DT Article DE SHORT-TERM GENOTOXICITY TEST DATA, COMPARING AND COMBINING; TEST DATA, GENOTOXICITY; COMPOSITE SCORING SYSTEM C1 LEIDEN UNIV,RADIAT GENET & CHEM MUTAGENESIS LAB,MGC,2300 RA LEIDEN,NETHERLANDS. RP MENDELSOHN, ML (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 5507,LIVERMORE,CA 94550, USA. NR 4 TC 33 Z9 33 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD MAR PY 1992 VL 266 IS 1 BP 43 EP 60 DI 10.1016/0027-5107(92)90220-V PG 18 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA HL059 UT WOS:A1992HL05900004 PM 1372963 ER PT J AU TAKAC, P AF TAKAC, P TI INVARIANT 2-TORI IN THE TIME-DEPENDENT GINZBURG-LANDAU EQUATION SO NONLINEARITY LA English DT Article ID PARTIAL-DIFFERENTIAL EQUATION; PERIODIC-SOLUTIONS; INSTABILITIES; CHAOS; BIFURCATION; ECKHAUS AB Numerical evidence shows the existence of 2- and 3-tori in the time-dependent complex Ginzburg-Landau equation (CGL) in one spatial dimension with periodic boundary conditions. We employ standard bifurcation methods, such as the Lyapunov-Schmidt reduction, to prove the existence of 2-tori by rigorous analytical tools. Bifurcations involve multi-dimensional (real or complex) eigenspaces. Our procedure enables us to obtain a unique smooth bifurcating manifold the dimension of which equals the dimension of the eigenspace. In particular, primary bifurcations from the zero solution yield periodic orbits, and secondary ones from rotating waves yield 2-tori. Their stability is discussed by means of centre manifold theory. While the rotating waves are represented by a wavefunction with temporally and spatially constant modulus, the bifurcating 2-tori have a wavefunction the modulus of which is a travelling wave. In superconductivity the square modulus of the wavefunction is proportional to the density of superconducting electrons. C1 ARGONNE NATL LAB, DIV MATH & COMP SCI, ARGONNE, IL 60439 USA. RP TAKAC, P (reprint author), VANDERBILT UNIV, DEPT MATH, NASHVILLE, TN 37240 USA. NR 38 TC 22 Z9 22 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0951-7715 EI 1361-6544 J9 NONLINEARITY JI Nonlinearity PD MAR PY 1992 VL 5 IS 2 BP 289 EP 321 DI 10.1088/0951-7715/5/2/002 PG 33 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA HR658 UT WOS:A1992HR65800002 ER PT J AU PEYRARD, M PIETTE, B ZAKRZEWSKI, WJ AF PEYRARD, M PIETTE, B ZAKRZEWSKI, WJ TI SOLITON SCATTERING IN THE SKYRME MODEL IN (2+1) DIMENSIONS .1. SOLITON SOLITON CASE SO NONLINEARITY LA English DT Article AB We consider instanton and anti-instanton solutions of the O(3) sigma-model in two Euclidean dimensions modified by the addition of an appropriate potential and Skyrme-like terms as static solitons (and antisolitons) of the same model in (2 + 1) dimensions. We study various scattering properties of these structures, which we call skyrmions. Most of the work is numerical and uses two formulations of the model; the well-known formulation in terms of a real vector field phi (with three components restricted to phi.phi = 1) and the formulation involving one complex field. We compare our results with similar results obtained in the pure O(3) sigma-model. We find that the potential and Skyrme terms which stabilize the skyrmions have relatively little effect on their scattering properties. In the scattering process initiated at low relative velocities the skyrmions bounce back while at velocities larger than some critical value they scatter at right angles. The value of this critical velocity depends on the values of the parameters of the potential and skyrme terms. The scattering is quasi-elastic and the skyrmions preserve their shape after the collision. We also analyse the scattering properties of rotating skyrmions and present their trajectories for some values of their rotation for several values of the parameters of the additional terms. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV DURHAM,DEPT MATH SCI,DURHAM DH1 3LE,ENGLAND. RP PEYRARD, M (reprint author), FAC SCI DIJON,6 BLVD GABRIEL,F-21000 DIJON,FRANCE. RI PEYRARD, Michel/C-8494-2014 NR 10 TC 26 Z9 27 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0951-7715 J9 NONLINEARITY JI Nonlinearity PD MAR PY 1992 VL 5 IS 2 BP 563 EP 583 DI 10.1088/0951-7715/5/2/012 PG 21 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA HR658 UT WOS:A1992HR65800012 ER PT J AU PEYRARD, M PIETTE, B ZAKRZEWSKI, WJ AF PEYRARD, M PIETTE, B ZAKRZEWSKI, WJ TI SOLITON SCATTERING IN THE SKYRME MODEL IN (2+1) DIMENSIONS .2. MORE GENERAL SYSTEMS SO NONLINEARITY LA English DT Article AB In this second paper in the series we continue our investigations of the instanton and anti-instanton solutions of the O(3) sigma-model in two Euclidean dimensions (modified by the addition of an apropriate potential and Skyrme-like terms) treated as static solitons (skyrmions) and antiskyrmions of the same model in (2 + 1) dimensions. We study various scattering properties of a system consisting of skyrmions and antiskyrmions and also of a system consisting of a skyrmion and a pure wave. Most of the work is numerical and uses two formulations of the model; the well-known formulation in terms of a real vector field phi (with three components restricted to phi.phi = 1) and the formulation involving one complex field. We find that the skyrmions and antiskyrmions attract each other and annihilate into pure radiation. We also find some interesting results on the scattering of pure radiation waves with skyrmions. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV DURHAM,DEPT MATH SCI,DURHAM DH1 3LE,ENGLAND. RP PEYRARD, M (reprint author), FAC SCI DIJON,6 BLVD GABRIEL,F-21000 DIJON,FRANCE. RI PEYRARD, Michel/C-8494-2014 NR 5 TC 14 Z9 14 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0951-7715 J9 NONLINEARITY JI Nonlinearity PD MAR PY 1992 VL 5 IS 2 BP 585 EP 600 DI 10.1088/0951-7715/5/2/013 PG 16 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA HR658 UT WOS:A1992HR65800013 ER PT J AU KELLY, JM AF KELLY, JM TI TRANSPORT OF NONNATIVE ORGANISMS IN BALLAST SEDIMENTS - AN INVESTIGATION OF WOODCHIP SHIPS ENTERING WASHINGTON-STATE WATERS SO NORTHWEST ENVIRONMENTAL JOURNAL LA English DT Note RP KELLY, JM (reprint author), BATTELLE MARINE SCI LAB,439 W SEQUIM BAY RD,SEQUIM,WA 98382, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU INST ENVIRON STUD PI SEATTLE PA UNIV WASHINGTON ENGINEERING ANNEX FM-12, SEATTLE, WA 98195 SN 0749-7962 J9 NORTHWEST ENVIRON J PD SPR-SUM PY 1992 VL 8 IS 1 BP 159 EP 160 PG 2 WC Ecology; Environmental Sciences; Forestry SC Environmental Sciences & Ecology; Forestry GA KK327 UT WOS:A1992KK32700018 ER PT J AU DALE, VH AF DALE, VH TI EXOTIC SEEDS REDUCE BIODIVERSITY ON THE MOUNT ST-HELENS DEBRIS AVALANCHE SO NORTHWEST ENVIRONMENTAL JOURNAL LA English DT Note RP DALE, VH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Dale, Virginia/B-6023-2009 NR 0 TC 0 Z9 0 U1 0 U2 1 PU INST ENVIRON STUD PI SEATTLE PA UNIV WASHINGTON ENGINEERING ANNEX FM-12, SEATTLE, WA 98195 SN 0749-7962 J9 NORTHWEST ENVIRON J PD SPR-SUM PY 1992 VL 8 IS 1 BP 183 EP 185 PG 3 WC Ecology; Environmental Sciences; Forestry SC Environmental Sciences & Ecology; Forestry GA KK327 UT WOS:A1992KK32700033 ER PT J AU DALE, VH AF DALE, VH TI DIVERSITY IMPACT AND RECOVERY AT MOUNT ST-HELENS - A FUNCTION OF DISTURBANCE SO NORTHWEST ENVIRONMENTAL JOURNAL LA English DT Note RP DALE, VH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Dale, Virginia/B-6023-2009 NR 0 TC 0 Z9 0 U1 0 U2 1 PU INST ENVIRON STUD PI SEATTLE PA UNIV WASHINGTON ENGINEERING ANNEX FM-12, SEATTLE, WA 98195 SN 0749-7962 J9 NORTHWEST ENVIRON J PD SPR-SUM PY 1992 VL 8 IS 1 BP 185 EP 187 PG 3 WC Ecology; Environmental Sciences; Forestry SC Environmental Sciences & Ecology; Forestry GA KK327 UT WOS:A1992KK32700034 ER PT J AU BUDNY, RV BELL, MG BIGLARI, H BITTER, M BUSH, CE CHENG, CZ FREDRICKSON, ED GREK, B HILL, KW HSUAN, H JANOS, AC JASSBY, DL JOHNSON, DW JOHNSON, LC LEBLANC, B MCCUNE, DC MIKKELSEN, DR PARK, HK RAMSEY, AT SABBAGH, SA SCOTT, SD SCHIVELL, JF STRACHAN, JD STRATTON, BC SYNAKOWSKI, EJ TAYLOR, G ZARNSTORFF, MC ZWEBEN, SJ AF BUDNY, RV BELL, MG BIGLARI, H BITTER, M BUSH, CE CHENG, CZ FREDRICKSON, ED GREK, B HILL, KW HSUAN, H JANOS, AC JASSBY, DL JOHNSON, DW JOHNSON, LC LEBLANC, B MCCUNE, DC MIKKELSEN, DR PARK, HK RAMSEY, AT SABBAGH, SA SCOTT, SD SCHIVELL, JF STRACHAN, JD STRATTON, BC SYNAKOWSKI, EJ TAYLOR, G ZARNSTORFF, MC ZWEBEN, SJ TI SIMULATIONS OF DEUTERIUM TRITIUM EXPERIMENTS IN TFTR SO NUCLEAR FUSION LA English DT Article ID FUSION TEST REACTOR; TOKAMAK; TEMPERATURE; SPECTROMETER; EMISSION; SYSTEMS AB A transport code (TRANSP) is used to simulate future deuterium-tritium (DT) experiments in TFTR. The simulations are derived from 14 TFTR DD discharges, and the modelling of one supershot is discussed in detail to indicate the degree of accuracy of the TRANSP modelling. Fusion energy yields and alpha-particle parameters are calculated, including profiles of the alpha-slowing down time, the alpha-average energy, and the Alfven speed and frequency. Two types of simulation are discussed. The main emphasis is on the DT equivalent, where an equal mix of D and T is substituted for the D in the initial target plasma, and for the D0 in the neutral beam injection, but the other measured beam and plasma parameters are unchanged. This simulation does not assume that alpha-heating will enhance the plasma parameters or that confinement will increase with the addition of tritium. The maximum relative fusion yield calculated for these simulations is Q(DT) approximately 0.3, and the maximum alpha-contribution to the central toroidal beta is beta(alpha)(0) approximately 0.5%. The stability of toroidicity induced Alfven eigenmodes (TAE) and kinetic ballooning modes (KBM) is discussed. The TAE mode is predicted to become unstable for some of the simulations, particularly after the termination of neutral beam injection. In the second type of simulation, empirical supershot scaling relations are used to project the performance at the maximum expected beam power. The MHD stability of the simulations is discussed. RP BUDNY, RV (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Sabbagh, Steven/C-7142-2011; Cheng, Chio/K-1005-2014 NR 43 TC 135 Z9 135 U1 2 U2 9 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 MAR PY 1992 VL 32 IS 3 BP 429 EP 447 DI 10.1088/0029-5515/32/3/I07 PG 19 WC Physics, Fluids & Plasmas SC Physics GA HL934 UT WOS:A1992HL93400007 ER PT J AU HORTON, LD ISLER, RC HOWE, HC CRUME, EC GILES, DC AF HORTON, LD ISLER, RC HOWE, HC CRUME, EC GILES, DC TI IMPURITY TRANSPORT IN THE ADVANCED TOROIDAL FACILITY SO NUCLEAR FUSION LA English DT Article ID HELIOTRON-E; INJECTED IMPURITIES; TOKAMAK; PLASMA; ACCUMULATION; CONFINEMENT AB The spectral line emissions from impurities injected using the laser ablation technique have been modelled in order to deduce impurity transport coefficients in the Advanced Toroidal Facility (ATF). The transport is found to be mainly diffusive, with little or no convective component. To reproduce the observed line emission it is necessary to postulate a radially dependent diffusion coefficient. For plasmas heated by electron cyclotron frequency waves the impurity transport is best fitted with a diffusion coefficient of 1000 cm2/s in the centre, increasing to 5000 cm2/s at the plasma edge. The global impurity particle confinement time for these plasmas is 65 ms and is considerably larger than the corresponding energy confinement time. Plasmas heated by high energy neutral particle beams display different impurity transport, with the best fit being a diffusion coefficient that is peaked on axis (5000 cm2/s) and that decreases towards larger minor radii (500 cm2/s at the plasma boundary). These transport coefficients have been successfully used to simulate the evolution of intrinsic impurities as well as laser ablated impurities in ATF. C1 JET JOINT UNDERTAKING,ABINGDON,OXON,ENGLAND. RP HORTON, LD (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830, USA. OI Isler, Ralph/0000-0002-5368-7200 NR 24 TC 2 Z9 2 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 MAR PY 1992 VL 32 IS 3 BP 481 EP 487 DI 10.1088/0029-5515/32/3/I10 PG 7 WC Physics, Fluids & Plasmas SC Physics GA HL934 UT WOS:A1992HL93400010 ER PT J AU MYNICK, HE ZWEBEN, SJ AF MYNICK, HE ZWEBEN, SJ TI MODIFICATION OF TURBULENT TRANSPORT BY ORBIT AVERAGING SO NUCLEAR FUSION LA English DT Letter ID AXISYMMETRIC GEOMETRIES; MAGNETIC PERTURBATIONS; TFTR TOKAMAK; DIFFUSION; INSTABILITY; ELECTRONS; MODES AB The effect on plasma turbulence of orbit averaging by thermal ions is considered. This effect can reduce the ion response, modifying the mode growth rate, which in turn changes the turbulent transport. For the trapped electron mode, this mechanism provides a potential explanation of the observed more favourable scaling of chi(i) with T(i) in supershots than in L-modes. Also, for this mode and for the ion temperature gradient mode, the effect modifies earlier transport expressions by a 'neoclassical factor', making the scalings of transport coefficients with magnetic field and current nearer those found experimentally. RP MYNICK, HE (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 20 TC 4 Z9 4 U1 0 U2 4 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 MAR PY 1992 VL 32 IS 3 BP 518 EP 522 DI 10.1088/0029-5515/32/3/I14 PG 5 WC Physics, Fluids & Plasmas SC Physics GA HL934 UT WOS:A1992HL93400014 ER PT J AU ADOLPHSEN, C JACOBSEN, RG LUTH, V GRATTA, G LABARGA, L LITKE, AM SCHWARZ, AS TURALA, M ZACCARDELLI, C BREAKSTONE, A KENNEY, CJ PARKER, SI BARNETT, BA DAUNCEY, P DREWER, DC MATTHEWS, JAJ AF ADOLPHSEN, C JACOBSEN, RG LUTH, V GRATTA, G LABARGA, L LITKE, AM SCHWARZ, AS TURALA, M ZACCARDELLI, C BREAKSTONE, A KENNEY, CJ PARKER, SI BARNETT, BA DAUNCEY, P DREWER, DC MATTHEWS, JAJ TI THE MARK-II SILICON STRIP VERTEX DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DRIFT CHAMBER; VLSI READOUT; BEAM; SLC AB A silicon strip vertex detector consisting of 36 modules has been built and operated in the Mark II solenoidal detector at the Stanford Linear Collider. The construction of the detector modules, their performance tests, the stability and accuracy of their placement, and the precision alignment of the complete device prior to and after installation are discussed. We also describe the operation of the vertex detector, and we discuss the measurement of impact parameters of charged particle tracks in conjunction with the Mark II wire drift chambers. C1 UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. UNIV HAWAII,HONOLULU,HI 96822. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP ADOLPHSEN, C (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 25 TC 15 Z9 15 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 MAR 1 PY 1992 VL 313 IS 1-2 BP 63 EP 102 DI 10.1016/0168-9002(92)90086-J PG 40 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HG343 UT WOS:A1992HG34300008 ER PT J AU ABLES, E ARMATIS, P COCHRAN, C GRAHAM, G LOWRY, M WUEST, C AF ABLES, E ARMATIS, P COCHRAN, C GRAHAM, G LOWRY, M WUEST, C TI MEASUREMENTS OF OPTICAL-PROPERTIES OF WAVESHIFTING OPTICAL FIBER FOR LIQUID SCINTILLATOR HADRON CALORIMETRY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Measurements have been made on optical properties of Bicron BCF91 waveshifting optical fiber. This fiber is proposed as a means of converting blue and UV light emitted from liquid scintillator when exposed to ionizing radiation. The conversion is accomplished by coiling the fiber in a reservoir filled with liquid scintillator and coated internally with reflective paint. Blue and UV light is absorbed by the waveshifting dyes in the fiber and reemitted in the green portion of the spectrum. Some of the reemitted light is channeled into the core of the fiber and out to photodetectors. It has been proposed to outfit the hadron calorimeter subsystem of the proposed GEM detector, to be built at the Superconducting Super Collider, with 800 000 separate liquid scintillator/waveshifting fiber cells. The measurements described in this work deal with the spectral properties of the fiber: spectral responsivity, spectral emissivity, and attenuation as a function of wavelength and propagation length. The theoretical response of an ideal calorimeter cell is studied based on the results of the measurements presented in this paper. RP ABLES, E (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1992 VL 313 IS 1-2 BP 142 EP 150 DI 10.1016/0168-9002(92)90090-Q PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HG343 UT WOS:A1992HG34300012 ER PT J AU ANDERSON, DF AF ANDERSON, DF TI THE EFFECTS OF PHOTOSENSITIVE DOPANTS ON ELECTRON-MOBILITY IN LIQUID ARGON SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PHOTOIONIZATION; TRIMETHYLAMINE; TRIETHYLAMINE; XENON AB The effects of photosensitive dopants on the electron drift velocity in liquid argon is presented. Collection times can be shortened by as much as 24% with the addition of 40 ppm of allene. There is no lengthening of the signal seen due to the slow scintillation component of argon. RP ANDERSON, DF (reprint author), FERMI NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510, USA. NR 15 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 MAR 1 PY 1992 VL 313 IS 1-2 BP 151 EP 154 DI 10.1016/0168-9002(92)90091-H PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HG343 UT WOS:A1992HG34300013 ER PT J AU GAVRON, A AF GAVRON, A TI SCINTILLATOR EFFICIENCY CALCULATIONS IN A HIGH-ENERGY TRANSPORT-CODE FRAMEWORK SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID NEUTRON DETECTION EFFICIENCY AB We have incorporated some additions and modification, to LAHET (the Los-Alamos High-Energy Transport code) which enable it to be used for hydrocarbon scintillator pulse-height and efficiency calculations. RP GAVRON, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,NEUTRON & NUCL SCI GRP,LOS ALAMOS,NM 87545, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1992 VL 313 IS 1-2 BP 161 EP 162 DI 10.1016/0168-9002(92)90093-J PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HG343 UT WOS:A1992HG34300015 ER PT J AU CATANI, L DIPIRRO, G MILARDI, C STECCHI, A TRASATTI, L LEE, MJ AF CATANI, L DIPIRRO, G MILARDI, C STECCHI, A TRASATTI, L LEE, MJ TI MARCO - MODELS OF ACCELERATORS AND RINGS TO COMMISSION AND OPERATE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB MARCO is a knowledge-based user interface for commissioning and operating modern accelerators and storage rings. Its purpose is to provide a model-referenced graphical interface system between the users and the machine. It allows access to modeling and simulation codes that are used in the design of the machine. It can be used to predict the effects of a change of parameters on the beam, or to compare the predicted with the measured effects. The design and prototype development of MARCO using HyperCard will be described in this paper. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP CATANI, L (reprint author), IST NAZL FIS NUCL,LAB NAZL FRASCATI,POB 13,I-00044 FRASCATI,ITALY. OI Di Pirro, Giampiero/0000-0002-3004-0754 NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1992 VL 313 IS 1-2 BP 273 EP 276 DI 10.1016/0168-9002(92)90105-D PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HG343 UT WOS:A1992HG34300027 ER PT J AU WEBER, WJ AF WEBER, WJ TI RADIATION-INDUCED AMORPHIZATION IN COMPLEX SILICATES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID DISORDER PRODUCTION; COMPOSITE MODEL; DAMAGE; ACCUMULATION; CA2ND8(SIO4)6O2; SEMICONDUCTORS; AMORPHOUSNESS; IMPLANTATION; IRRADIATION; CAZRTI2O7 AB The macroscopic swelling from alpha-decay events in Pu-doped ZrSiO4, natural ZrSiO4 minerals, and Cm-doped Ca2Nd8(SiO4)6O2 is interpreted in terms of both unit-cell expansion from defect accumulation and the volume change that occurs as the local crystal structure and long-range order collapse during amorphization. The derived amorphous fraction in ZrSiO4 as a function of cumulative alpha-decay events is consistent with models based on the multiple overlap of displacement cascades, suggesting that amorphization in ZrSiO4 occurs as a result of the local accumulation of high-defect concentrations. In Ca2Nd8(SiO4)6O2, on the other hand, the rate of amorphization is higher and the derived amorphous fraction as a function of cumulative alpha-decay events is consistent with amorphization occurring directly within the displacement cascade. RP WEBER, WJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Weber, William/A-4177-2008 OI Weber, William/0000-0002-9017-7365 NR 23 TC 15 Z9 15 U1 2 U2 3 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 MAR PY 1992 VL 65 IS 1-4 BP 88 EP 92 DI 10.1016/0168-583X(92)95018-M PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200014 ER PT J AU WEBER, WJ HESS, NJ MAUPIN, GD AF WEBER, WJ HESS, NJ MAUPIN, GD TI AMORPHIZATION IN GD2TI2O7 AND CAZRTI2O7 IRRADIATED WITH 3 MEV ARGON IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID PU-SUBSTITUTED ZIRCONOLITE; SELF-RADIATION DAMAGE; ALPHA-RECOIL DAMAGE; NATURAL ZIRCONOLITE; CRYSTAL-STRUCTURES; BOMBARDMENT AB Irradiation of Gd2Ti2O7 and CaZrTi2O7 with 3 MeV Ar+ ions results in the simultaneous expansion of the unit-cell volume and radiation-induced amorphization. The damage cross sections for amorphization, which were determined by X-ray diffraction, are 0.023 nm2 and 0.014 nm2, respectively. These damage cross sections are relatively low and suggest some inherent resistance of these structures to amorphization, in agreement with previous studies. Transmission electron microscopy and electron diffraction confirmed the amorphous character of both materials at high fluences. Raman spectroscopy indicated a decrease in scattered intensity with ion fluence for the Raman-active vibrational modes of Gd2Ti2O7 and CaZrTi2O7. In the case of Gd2Ti2O7, increases in both linewidth and wavenumber with ion fluence also were observed. RP WEBER, WJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Weber, William/A-4177-2008; OI Weber, William/0000-0002-9017-7365; Hess, Nancy/0000-0002-8930-9500 NR 25 TC 29 Z9 30 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAR PY 1992 VL 65 IS 1-4 BP 102 EP 106 DI 10.1016/0168-583X(92)95021-I PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200017 ER PT J AU PEREZ, A ABONNEAU, E FUCHS, G TREILLEUX, M MCHARGUE, CJ JOSLIN, DL AF PEREZ, A ABONNEAU, E FUCHS, G TREILLEUX, M MCHARGUE, CJ JOSLIN, DL TI ION-BEAM MIXING OF METAL CERAMIC INTERFACES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID CONVERSION-ELECTRON MOSSBAUER; IMPLANTATION; ADHESION; ENHANCEMENT; ALPHA-AL2O3; CRYSTALS; ALUMINA AB Iron and copper thin metallic films (thickness less-than-or-equal-to 100 nm) deposited on sapphire substrates (alpha-Al2O3) were mixed at room temperature by various rare gas ions (Ne, Ar, Kr and Xe) in large energy and dose ranges. Microstructural and chemical characterization of the mixed interfaces were performed using three complementary techniques: high resolution transmission electron microscopy (HRTEM), X-ray photoemission spectroscopy (XPS) and conversion electron Mossbauer spectrometry (CEMS) in the particular case of Fe/Al2O3 samples. The final atom distributions at the mixed interface are the result of the ballistic phase of mixing and no long range diffusion of mixed elements in Al2O3 has been observed. The result is a very narrow and damaged interface (amorphous or not in the case of Fe/Al2O3 or Cu/Al2O3 respectively) containing a very high concentration of metallic atom recoils. The composition and nature of this interfacial layer, which completely depends on the energy deposition at the interface, which is controlled by the mixing parameters (mass of the incident ion, energy and fluence) are the origin of the spectacular adhesion enhancement observed. In the particular case of the Fe/Al2O3 interface, the formation of iron recoils in Al2O3 in the Fe2+ state and the formation of the spinel phase seem to be correlated with the quality of the interfacial joint in terms of adhesion. Thermal annealings in a low temperature range (< 600-degrees-C) promote the spinel phase formation and produce an additional positive effect on adhesion. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP PEREZ, A (reprint author), UNIV LYON 1,DEPT PHYS MAT,F-69622 VILLEURBANNE,FRANCE. NR 34 TC 36 Z9 37 U1 0 U2 6 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 MAR PY 1992 VL 65 IS 1-4 BP 129 EP 138 DI 10.1016/0168-583X(92)95025-M PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200021 ER PT J AU ARNOLD, GW AF ARNOLD, GW TI ION-IMPLANTATION EFFECTS IN CRYSTALLINE QUARTZ SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID RADIATION-DAMAGE; SILICA AB Cantilever beam measurements of the stress induced in crystalline quartz by implantation of 150 keV Ar and/or 250 keV He have shown that the data scale with energy into collisional processes. The damage state induced by the Ar implants does not lend itself to efficient utilization of the electronic component of subsequent He implantation in producing further disorder. The damage depth has been measured (optically) for a number of ions (1 x 10(16) 250 keV/cm2) and has been found to vary (relative to TRIM values) from about 0.63 R(p) for He to about 1.84R(p) for Xe. RBS measurements of range for Ar to Au give values in fair agreement with the optical values. The ratio of the measured (optical) ranges to the predicted (TRIM) ranges, when plotted as a function of collisional energy deposition, indicates that extended damage (beyond ion range) occurs for deposition energies > approximately 1 x 10(22) keV/cm3. The damage persists even after 900-degrees-C anneals. The effects of ion-induced stress may be an important factor in the establishment of the extended damage state. RP ARNOLD, GW (reprint author), SANDIA NATL LABS,DIV ION SOLID INTERACT 1111,ALBUQUERQUE,NM 87185, USA. NR 14 TC 16 Z9 16 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 MAR PY 1992 VL 65 IS 1-4 BP 213 EP 216 DI 10.1016/0168-583X(92)95036-Q PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200032 ER PT J AU HORTON, LL BENTLEY, J ROMANA, L PEREZ, A MCHARGUE, CJ MCCALLUM, JC AF HORTON, LL BENTLEY, J ROMANA, L PEREZ, A MCHARGUE, CJ MCCALLUM, JC TI MICROSTRUCTURAL CHARACTERIZATION OF IRON-ION IMPLANTATION OF SILICON-CARBIDE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY AB In order to better use implantation to improve the properties of ceramics, a detailed understanding of the nature of implanted species is needed. In this investigation, analytical electron microscopy (AEM) and Rutherford backscattering spectroscopy-ion channeling (RBS-C) have been used to characterize single crystal alpha-silicon carbide implanted at room temperature with 160 keV Fe-57 ions to fluences of 1, 3, and 6 x 10(16) ions/cm2. RBS-ion channeling demonstrated that the implanted region was amorphous even at the lowest fluence. AEM was performed for both cross-sectional and back-thinned specimens with the highest fluence. The depth of the peak iron concentration measured with energy dispersive X-ray spectroscopy and with RBS were in approximate agreement with the value calculated by the TRIM code assuming a specimen density equal to crystalline silicon carbide. The AEM examinations of the implanted regions in this study did not reveal the presence of any precipitates, suggesting that the iron has not coalesced into precipitates (observation limit almost-equal-to 2 nm). Inspection of the electron energy loss fine structure for iron in the implanted specimens suggests that the iron is not metallically-bonded; this result supports the conclusion from conversion electron Mossbauer spectroscopy (CEMS) that the iron is covalently bonded. C1 UNIV LYON 1,DEPT PHYS MAT,F-69622 VILLEURBANNE,FRANCE. UNIV TENNESSEE,KNOXVILLE,TN 37993. ROYAL MELBOURNE INST TECHNOL,MELBOURNE,VIC 3001,AUSTRALIA. RP HORTON, LL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 9 TC 31 Z9 31 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAR PY 1992 VL 65 IS 1-4 BP 345 EP 351 DI 10.1016/0168-583X(92)95064-X PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200060 ER PT J AU ARNOLD, GW BATTAGLIN, G BOSCOLOBOSCOLETTO, A CACCAVALE, F DEMARCHI, G MAZZOLDI, P MIOTELLO, A AF ARNOLD, GW BATTAGLIN, G BOSCOLOBOSCOLETTO, A CACCAVALE, F DEMARCHI, G MAZZOLDI, P MIOTELLO, A TI DEFECT DIFFUSION IN ION-IMPLANTED GLASSES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID SILICA GLASS; DAMAGE AB Ion implantation in glasses produces structure modifications at depths greater than those of the implanted ion range. Such a result is evidenced by means of leaching experiments, alkali element depletion, distribution of gaseous implanted species, etching rate as function of depth. A systematic study with the aim to evidence a threshold in the nuclear deposited energy for defect diffusion is presented. Fourier transform infrared spectroscopy measurements confirm the glass modifications at extended depths. C1 UNIV PADUA,DIPARTIMENTO FIS,CONSORZIO INFM,I-35100 PADUA,ITALY. UNIV VENICE,DIPARTIMENTO CHIM FIS,CONSORZIO INFM,VENICE,ITALY. CTR RIC MONTEDIPE,VENICE,ITALY. UNIV TRENTO,DIPARTIMENTO FIS,CONSORZIO INFM,I-38050 TRENT,ITALY. RP ARNOLD, GW (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Battaglin, Giancarlo/H-7792-2015 OI Battaglin, Giancarlo/0000-0003-1380-4465 NR 20 TC 24 Z9 24 U1 0 U2 3 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 MAR PY 1992 VL 65 IS 1-4 BP 387 EP 391 DI 10.1016/0168-583X(92)95072-Y PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200068 ER PT J AU HAGLUND, RF MAGRUDER, RH MORGAN, SH HENDERSON, DO WELLER, RA YANG, L ZUHR, RA AF HAGLUND, RF MAGRUDER, RH MORGAN, SH HENDERSON, DO WELLER, RA YANG, L ZUHR, RA TI NONLINEAR INDEX OF REFRACTION OF CU-IMPLANTED AND PB-IMPLANTED FUSED-SILICA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID OPTICAL NONLINEARITIES; ION-IMPLANTATION AB We have measured the nonlinear index of refraction in high-purity fused silica implanted with Pb and Cu ions, using 100-ps pulses from a cw, mode-locked, frequency-doubled Nd:YAG laser (lambda = 532 nm). The nonlinear index measured for the Pb-implanted silica is an order of magnitude larger than that for Cu:silica. Qualitative evidence from infrared reflectance spectra suggests that these differences may result from distinctive ways in which these implanted ions are incorporated into the glass network: the Cu appears to form nm-size colloids, while the Pb may be incorporated into a Pb-O-Si glassy phase. C1 VANDERBILT UNIV,DEPT MAT SCI & ENGN,NASHVILLE,TN 37235. FISK UNIV,DEPT PHYS,NASHVILLE,TN 37203. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP HAGLUND, RF (reprint author), VANDERBILT UNIV,DEPT ASTRON,NASHVILLE,TN 37235, USA. NR 13 TC 25 Z9 25 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 MAR PY 1992 VL 65 IS 1-4 BP 405 EP 411 DI 10.1016/0168-583X(92)95076-4 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200072 ER PT J AU BARBOUR, JC VENTURINI, EL GINLEY, DS KWAK, JF AF BARBOUR, JC VENTURINI, EL GINLEY, DS KWAK, JF TI IRRADIATION EFFECTS IN HIGH-TEMPERATURE SUPERCONDUCTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON RADIATION EFFECTS IN INSULATORS CY JUN 24-28, 1991 CL WEIMER, GERMANY ID CU-O SYSTEM; THIN-FILMS; CRITICAL CURRENTS; SINGLE-CRYSTAL; BULK SUPERCONDUCTIVITY; YBA2CU3O7-DELTA FILMS; ION IRRADIATION; TRANSITION; MOBILITY AB Irradiation effects on Tl- and Y-based high temperature superconductors (HTS) are compared. Ion irradiation can enhance the critical current density (J(c)) at low fluences through the interaction of defects with the flux lattice, and at higher fluences ion irradiation can degrade the superconducting transition temperature (T(c)) and increase the normal state resistivity (rho). Low-influence irradiation of Tl2Ca2Ba2Cu3O10 (Tl-2223) single crystals was shown to increase J(c) by an order of magnitude over J(c) for unirradiated crystals. Similarly, irradiated YBa2Cu3O7-delta (YBCO) crystals have increased J(c)s by factors of 2 to 100; however, the effects of irradiation on thin-film HTS from these two materials depends greatly on their crystalline quality. Ion irradiation of millimeter grain-size Tl-2223 films was shown to increase J(c) while similar irradiation of approximately 10-mu-m grain-size Tl-2223 films had little effect on J(c). For ions with energies less than several MeV/amu, the dominant mechanism causing irradiation-induced degradation of T(c) is collisional damage. Both Tl-based and YBCO superconductors behave similarly in that T(c) decreases linearly with the level of damage; yet, the rate of decrease in T(c) for Tl-based superconductors (5000 K/dpa) was approximately twice that for irradiated YBCO. An examination of the temperature behavior and rate of damage recovery of rho yielded an activation energy of 0.36 eV for annealing defects. RP BARBOUR, JC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 32 TC 25 Z9 25 U1 1 U2 6 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 MAR PY 1992 VL 65 IS 1-4 BP 531 EP 538 DI 10.1016/0168-583X(92)95100-6 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN332 UT WOS:A1992HN33200096 ER PT J AU GOLANSKI, A WHITE, CW AF GOLANSKI, A WHITE, CW TI RADIATION-INDUCED EFFECTS IN ION-BEAM SYNTHESIS OF ERBIUM SILICIDE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID SI; IMPLANTATION; FILMS AB Single crystal Si was implanted with 145-170 keV Er+ ions using implantation temperatures 250 < T(i) < 520-degrees-C. The morphology of the implanted system is shown to strongly depend on ion beam induced phenomena, such as the defect mediated diffusion of erbium occurring at temperatures T(i) > 300-degrees-C (at least 400-degrees-C below the minimum temperature required for the thermally activated diffusion to become observable), the ion beam induced formation of the polycrystalline ErSi2 phase at T(i) > 280-degrees-C (at least 100-degrees-C below the temperature required for contact reactions between the Si substrate and deposited Er metal to occur). For T(i) > 400-degrees-C the implantation process results in the formation coherent ErSi2 precipitates, preferentially oriented along the [111] axis. During a subsequent thermal annealing, a buried layer of single crystal ErSi2 is formed. The activation energy for the single-crystalline ErSi2 phase formation is close to 4.8 eV. The samples containing buried ErSi2 were used as seeds and re-implanted at 250 < T(i) < 520-degrees-C. During the re-implantation process, the buried ErSi2 layer grows mesotaxially along both interfaces for T(i) > 300-degrees-C. The growth mechanism is related to the ion beam induced, defect mediated diffusion of Er atoms. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP GOLANSKI, A (reprint author), CTR NATL ETUD TELECOMMUN,BP 98,F-38240 MEYLAN,FRANCE. NR 21 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAR PY 1992 VL 63 IS 4 BP 384 EP 390 DI 10.1016/0168-583X(92)95209-A PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN168 UT WOS:A1992HN16800003 ER PT J AU COMEDI, D KALISH, R BARRETT, JH AF COMEDI, D KALISH, R BARRETT, JH TI A METHOD FOR THE DETERMINATION OF ATOMIC DISPLACEMENTS IN COMPOUND-CRYSTALS BY MEANS OF RBS PIXE CHANNELING EXPERIMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID ABSORPTION FINE-STRUCTURE; SOLID-SOLUTIONS; CRYSTALLOGRAPHIC POLARITY; VIBRATIONS; ZNXCD1-XTE; HG1-XCDXTE; GA1-XINXAS; DEPENDENCE AB A method which combines proton-induced X-ray emission (PIXE), Rutherford backscattering (RBS) and ion channeling, which enables the determination of static or dynamic root-mean-square displacements of constituent atoms in compound crystals is described. Full PIXE and RBS channeling angular scan curves are measured simultaneously by scanning through a major axis of the crystal under study. The experimental data are interpreted by using two different methods: A) a simple semi-analytical model which takes advantage of the depth information contained in RBS spectra to estimate depth correction factors needed to analyze the PIXE angular scan data, and B) a Monte Carlo simulation program of channeling, which takes into account the special structural features of the materials studied and allows for a direct comparison of simulated results with experimental PIXE data. The use of the technique is demonstrated by deducing rms displacements of constituent atoms of some II-VI (binary and ternary) semiconductors analyzed by both methods. The present results agree well with vibrational amplitude data obtained from X-ray diffraction measurements available from the literature. C1 TECHNION ISRAEL INST TECHNOL, INST SOLID STATE, IL-32000 HAIFA, ISRAEL. TECHNION ISRAEL INST TECHNOL, DEPT PHYS, IL-32000 HAIFA, ISRAEL. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. NR 31 TC 14 Z9 14 U1 0 U2 3 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 MAR PY 1992 VL 63 IS 4 BP 451 EP 461 DI 10.1016/0168-583X(92)95218-G PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HN168 UT WOS:A1992HN16800012 ER PT J AU WIMETT, TF AF WIMETT, TF TI DYNAMICS AND POWER PREDICTION IN FISSION BURSTS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Large dynamic stresses are induced in the fuel components of fast-burst, or pulse, reactors because of rapid fission heating. These stresses increase more than linearly with burst energy yield and, at some yield, will cause fuel failure. Despite many attempts, no one has yet succeeded in predicting a fuel damage threshold with useful certainty in the reactor design stage, nor has the maximum fuel stress for a given power pulse in an operating reactor been calculated satisfactorily. Some analytic solutions for the burst dynamic behavior of typical fuel components that are consistent with available fuel displacement measurements are discussed. In particular, an analytic function is introduced for stress-vibration excitation of fuel components by the bell-shaped power pulse of a reactor burst. These solutions can be employed to determine fuel damage thresholds with useful certainty. Also, a new approach is presented for the analysis of prompt burst power transients by employing fuel displacement solutions to derive dynamic reactivity quench for use in power calculations. RP WIMETT, TF (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 2 Z9 3 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 MAR PY 1992 VL 110 IS 3 BP 209 EP 236 PG 28 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HG980 UT WOS:A1992HG98000001 ER PT J AU BOOTH, TE PEDERSON, SP AF BOOTH, TE PEDERSON, SP TI UNBIASED COMBINATIONS OF NONANALOG MONTE-CARLO TECHNIQUES AND FAIR GAMES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Historically, Monte Carlo variance reduction techniques have been developed one at a time in response to calculational needs. The theoretical basis is provided for obtaining unbiased Monte Carlo estimates from all possible combinations of variance reduction techniques. Hitherto, the techniques have not been proven to be unbiased in arbitrary combinations. The authors are unaware of any Monte Carlo techniques (in any linear process) that are not treated by the theorem herein. RP BOOTH, TE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 10 TC 4 Z9 4 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 MAR PY 1992 VL 110 IS 3 BP 254 EP 261 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HG980 UT WOS:A1992HG98000003 ER PT J AU MEIER, MM AMIAN, WB GOULDING, CA MORGAN, GL MOSS, CE AF MEIER, MM AMIAN, WB GOULDING, CA MORGAN, GL MOSS, CE TI DIFFERENTIAL NEUTRON-PRODUCTION CROSS-SECTIONS FOR 256-MEV PROTONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID STOPPING-LENGTH TARGETS; EFFICIENCY; YIELDS AB Differential (p,xn) cross sections, d2-sigma/d-OMEGA-dE(n), from thin targets of beryllium, carbon, oxygen, aluminum, iron, lead, and U-238 for 256-MeV protons are measured. Time-of-flight techniques are used to identify and discriminate against backgrounds and to determine the neutron energy spectrum. Comparison of the experimental data with intranuclear-cascade evaporation-model calculations using the HETC code showed discrepancies of as much as a factor of 7, notably at 7.5 and 150 deg. RP MEIER, MM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 16 TC 41 Z9 42 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 MAR PY 1992 VL 110 IS 3 BP 289 EP 298 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HG980 UT WOS:A1992HG98000007 ER PT J AU MEIER, MM AMIAN, WB GOULDING, CA MORGAN, GL MOSS, CE AF MEIER, MM AMIAN, WB GOULDING, CA MORGAN, GL MOSS, CE TI NEUTRON YIELDS FROM STOPPING-LENGTH TARGETS FOR 256-MEV PROTONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note AB Absolute neutron yields from stopping-length targets at angles of 7.5, 30, 60, and 150 deg for the 256-MeV proton bombardment of elemental beryllium, carbon, aluminum, and iron are measured. Time-of-flight techniques are used to identify and discriminate against backgrounds and to determine the neutron energy spectrum. Comparison of the experimental data with intranuclear-cascade evaporation-model calculations using the HETC code showed good agreement, indicating that transport probably dominates production effects in the calculations. RP MEIER, MM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 3 TC 13 Z9 13 U1 2 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 MAR PY 1992 VL 110 IS 3 BP 299 EP 301 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HG980 UT WOS:A1992HG98000008 ER PT J AU WADKINS, RP AMBROSEK, RG AF WADKINS, RP AMBROSEK, RG TI 3-DIMENSIONAL THERMAL ASPECTS OF ALUMINUM FUEL-ELEMENTS SO NUCLEAR TECHNOLOGY LA English DT Article DE TEST REACTORS; HEAT TRANSFER; ALUMINUM FUEL ELEMENTS AB Aluminum-clad fuel plates generally used in nuclear research reactors have unique heat transfer characteristics that require three-dimensional heat conduction modeling without large conservatism. A model, ATR SINDA, was written to interface with the thermal analyzer SINDA, for analysis of the Advanced Test Reactor fuel plates. Comparative analyses with two- and three-dimensional models show significantly higher fuel and coolant temperatures with the two-dimensional model. Comparative analyses also demonstrate that departure from nucleate boiling depends on material. RP WADKINS, RP (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD MAR PY 1992 VL 97 IS 3 BP 344 EP 351 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HD621 UT WOS:A1992HD62100010 ER PT J AU SUBUDHI, M AF SUBUDHI, M TI LIFE TESTING OF A LOW-VOLTAGE AIR CIRCUIT-BREAKER TO ASSESS AGE-RELATED DEGRADATION SO NUCLEAR TECHNOLOGY LA English DT Article DE CIRCUIT BREAKER AGING; REACTOR TRIP BREAKER LIFE TESTING; MECHANICAL CYCLING OF BREAKERS AB A DS-416 low-voltage air circuit breaker manufactured by Westinghouse is mechanically cycled to identify age-related degradation in the various breaker subcomponents, specifically in the power-operated mechanism. This accelerated aging test is performed on one breaker unit for over 36 000 cycles. Three separate pole shafts, one with a 60-deg weld, one with a 120-deg weld, and one with a 180-deg weld in the third pole lever, are used to characterize cracking in the welds. In addition, during the testing, three different operating mechanisms and several other parts are replaced as they become inoperable. Among the seven welds on the pole shaft, welds 1 and 3 are found to be critical ones whose fracture can result in misalignment of the pole levers. This can lead to problems with the operating mechanism, including the burning of coils, excessive wear in certain parts, and overstressed linkages. Furthermore, the limiting service life of a number of subcomponents of the power-operated mechanism, including the operating mechanism itself, is assessed. Based on these findings, suggestions are provided to alleviate the age-related degradation that could occur as a result of normal closing and opening of the breaker contacts during the breaker's service life. C1 BROOKHAVEN NATL LAB,SCI STAFF,UPTON,NY 11973. RP SUBUDHI, M (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,UPTON,NY 11973, USA. NR 4 TC 2 Z9 2 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 MAR PY 1992 VL 97 IS 3 BP 362 EP 370 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HD621 UT WOS:A1992HD62100012 ER PT J AU OLDENBURG, CM SPERA, FJ AF OLDENBURG, CM SPERA, FJ TI HYBRID MODEL FOR SOLIDIFICATION AND CONVECTION SO NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS LA English DT Article ID RHEOLOGY AB We present a hybrid model for continuum phase-change problems. The hybrid model accounts for flow in regions of concentrated mush, dilute mush, and single-phase liquid. Scale analysis shows that, in dilute mush, the Blake-Kozeny-Carman relation may lead to inaccuracy in the continuum formulation for certain values of the Rayleigh and Darcy numbers. The hybrid model uses arctangent switching functions to switch on the Darcy flow and variable viscosity terms depending on the local value of the fraction solid. Two-dimensional example calculations suggest that the hybrid model more accurately accounts for transport in the dilute mush region. C1 UNIV CALIF SANTA BARBARA,INST CRUSTAL STUDIES,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT GEOL SCI,SANTA BARBARA,CA 93106. RP OLDENBURG, CM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI 50E,BERKELEY,CA 94720, USA. RI Oldenburg, Curtis/L-6219-2013 OI Oldenburg, Curtis/0000-0002-0132-6016 NR 13 TC 48 Z9 49 U1 0 U2 4 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7790 J9 NUMER HEAT TR B-FUND JI Numer Heat Tranf. B-Fundam. PD MAR-APR PY 1992 VL 21 IS 2 BP 217 EP 229 DI 10.1080/10407799208944917 PG 13 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA HK740 UT WOS:A1992HK74000005 ER PT J AU CAI, XC GROPP, WD KEYES, DE AF CAI, XC GROPP, WD KEYES, DE TI CONVERGENCE RATE ESTIMATE FOR A DOMAIN DECOMPOSITION METHOD SO NUMERISCHE MATHEMATIK LA English DT Article ID ELLIPTIC PROBLEMS; INDEFINITE AB We provide a convergence rate analysis for a variant of the domain decomposition method introduced by Gropp and Keyes for solving the algebraic equations that arise from finite element discretization of nonsymmetric and indefinite elliptic problems with Dirichlet boundary conditions in IR2. We show that the convergence rate of the preconditioned GMRES method is nearly optimal in the sense that the rate of convergence depends only logarithmically on the mesh size and the number of substructures, if the global coarse mesh is fine enough. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. YALE UNIV,DEPT MECH ENGN,NEW HAVEN,CT 06520. RP CAI, XC (reprint author), UNIV KENTUCKY,DEPT MATH,LEXINGTON,KY 40506, USA. OI Gropp, William/0000-0003-2905-3029 NR 22 TC 10 Z9 10 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0029-599X J9 NUMER MATH JI Numer. Math. PD MAR PY 1992 VL 61 IS 2 BP 153 EP 169 DI 10.1007/BF01385503 PG 17 WC Mathematics, Applied SC Mathematics GA HE315 UT WOS:A1992HE31500002 ER PT J AU ROBERTS, LE AF ROBERTS, LE TI INCLUSIVE PI(0) PRODUCTION IN ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID PAIR PRODUCTION AB For several ion species we compare thermal to nonthermal contributions for inclusive pi-0 production after having used a hydrodynamical model to estimate the energy density and temperature of the quark-gluon plasma produced by each. For the high (low)-p(T) region quantum chromodynamics (the Fermi model) is used to estimate the nonthermal rates. The production of low p(T), low x(F) pi-0's, which clearly stand out from the background, is energetically favored by the quark-gluon plasma. C1 INST SCI STUDIES, WHEATON, IL 60187 USA. ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. RP LINCOLN UNIV, LINCOLN UNIV, PA 19352 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD MAR PY 1992 VL 105 IS 3 BP 423 EP 433 DI 10.1007/BF02730645 PG 11 WC Physics, Particles & Fields SC Physics GA HQ624 UT WOS:A1992HQ62400010 ER PT J AU ZIEMANN, V AF ZIEMANN, V TI FREE-ELECTRON LASER SUPERMODES FOR BUNCHES WITH LONGITUDINAL ENERGY-POSITION CORRELATION SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL PHYSICS RELATIVITY ASTRONOMY AND MATHEMATICAL PHYSICS AND METHODS LA English DT Article ID OSCILLATIONS; LETHARGY AB In this note the theory of Free-Electron Laser (FEL) supermodes is extended to cover particle distributions with a correlation between energy and longitudinal position in a Gaussian bunch. This extension is important for FEL's in storage rings, because wake forces stemming from discontinuities in the vacuum chamber as well as the FEL process itself give rise to such correlations. RP ZIEMANN, V (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 0369-3554 J9 NUOVO CIMENTO B JI Nouvo Cimento Soc. Ital. Fis. B-Gen. Phys. Relativ. Astron. Math. Phys. Methods PD MAR PY 1992 VL 107 IS 3 BP 317 EP 329 DI 10.1007/BF02728493 PG 13 WC Physics, Multidisciplinary SC Physics GA HU366 UT WOS:A1992HU36600007 ER PT J AU WINEMILLER, KO AF WINEMILLER, KO TI LIFE-HISTORY STRATEGIES AND THE EFFECTIVENESS OF SEXUAL SELECTION SO OIKOS LA English DT Article ID ECOLOGICAL STRATEGIES; REPRODUCTIVE EFFORT; NATURAL-SELECTION; EVOLUTION; PATTERNS; SIZE; FISH; FLUCTUATIONS; PARAMETERS; HABITAT AB The hypothesized relationship between the relative strength of sexual selection and life-history strategies is reexamined. The potential effectiveness of sexual selection depends not only on the relative survivorship of immature stages, but also on other components of fitness. The effects of fecundity and timing of maturation must be evaluated together with the survivorship in order to determine the reponsiveness of alternative life-history configurations to the force of sexual selection. More-over, the r-K continuum is an inadequate model for comparisons of life-history strategies. A general three-dimensional demographic model provides a more comprehensive conceptual framework for life-history comparisons. The three-parameter demographic model is similar to several earlier two-dimensional life-history schemes and appears to describe a broad spectrum of the life-history strategies exhibited in nature. Most higher taxa tend to be dominated by only one or two of the three endpoint strategies: "equilibrium" (large investment in relatively few individual offspring), "opportunistic" (small size and rapid maturation), and "periodic" (pulsed production of large numbers of small offspring). A survey of teleost fishes and examples from several other higher taxa supports McLain's (1991) contention that the strength of sexual selection is influenced by life-history strategy. Conspicuous males are common among relative equilibrium and opportunistic strategists, but are essentially absent among species associated with the high-fecundity, periodic reproductive strategy. The absence of sexually selected traits in high-fecundity broadcast spawners implies that differential survivorship among immature life stages is nonrandom in all cases. RP WINEMILLER, KO (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Langerhans, R./A-7205-2009; OI Winemiller, Kirk/0000-0003-0236-5129 NR 60 TC 78 Z9 83 U1 2 U2 28 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 MAR PY 1992 VL 63 IS 2 BP 318 EP 327 DI 10.2307/3545395 PG 10 WC Ecology SC Environmental Sciences & Ecology GA HL789 UT WOS:A1992HL78900022 ER PT J AU LAWRENCE, TW FITCH, JP GOODMAN, DM MASSIE, NA SHERWOOD, RJ JOHANSSON, EM AF LAWRENCE, TW FITCH, JP GOODMAN, DM MASSIE, NA SHERWOOD, RJ JOHANSSON, EM TI EXTENDED-IMAGE RECONSTRUCTION THROUGH HORIZONTAL PATH TURBULENCE USING BISPECTRAL SPECKLE INTERFEROMETRY SO OPTICAL ENGINEERING LA English DT Article DE SPECKLE IMAGING; BISPECTRAL PROCESSING; CCD SENSORS; COMPENSATED IMAGING ID PHASE; RECOVERY; MASKING AB Results are presented from a horizontal path imaging experiment in which a 0.5-m telescope was focused on targets located at a range of 1.2 km. The targets varied in complexity from simple binary letters to extended representations of satellites with gray scale and size variations. Imaging at a center wavelength of 0.7-mu-m, we found an atmospheric degradation factor of D/r0 = 17, on average. We used a slow read-rate bare CCD detector and thus had to deal effectively with additive noise in the speckle measurements. Our image reconstruction algorithms are based on the use of the complex bispectrum, and we have demonstrated diffraction-limited imaging down to light levels approaching a few photons per speckle per resolution area. We have paid careful attention to the effects of additive noise on the reconstruction process and have shown that they can be adequately overcome. These results support the feasibility of high-resolution speckle imaging of high-earth-orbit satellites using CCDs. C1 UNIV CALIF DAVIS,COMP SCI GRAD GRP,DAVIS,CA 95616. RP LAWRENCE, TW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT ELECTR ENGN,DIV LASER ENGN,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 14 TC 9 Z9 10 U1 3 U2 6 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 MAR PY 1992 VL 31 IS 3 BP 627 EP 636 DI 10.1117/12.56083 PG 10 WC Optics SC Optics GA HJ296 UT WOS:A1992HJ29600029 ER PT J AU DAVIS, OK SHAFER, DS AF DAVIS, OK SHAFER, DS TI A HOLOCENE CLIMATIC RECORD FOR THE SONORAN DESERT FROM POLLEN ANALYSIS OF MONTEZUMA WELL, ARIZONA, USA SO PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY LA English DT Article ID SAN-JUAN MOUNTAINS; NEW-MEXICO; COLORADO; DEGLACIATION; VEGETATION; EPISODES; AGE AB Pollen and macrofossil analyses of a radiocarbon-dated core, 1125 cm long, from Montezuma Well, elev. 1125 m, Yavapai County, Arizona, provide a record of summer precipitation similar to that of other monsoonal regions of the world. Precipitation was least from 4000 to 5000 yr B.P., and generally was greater than today before 8400 yr B.P. During the early-Holocene moist period, oak and grass pollen are abundant, and the best modern analogs are within the Arizona Monsoon boundary, so increased summer precipitation is indicated. Climatic parameters are estimated with the technique of best modern analogs for fossil samples. Temperature was highest ca. 3400 and 5700 yr B.P., and generally was cooler than today before 6800 yr B.P. Brief cold intervals in the Holocene match periods of global cooling and of positive C-14 and Be-10 anomalies. C1 US DOE,WASHINGTON,DC 20585. RP DAVIS, OK (reprint author), UNIV ARIZONA,DEPT GEOSCI,TUCSON,AZ 85721, USA. NR 65 TC 55 Z9 55 U1 4 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-0182 J9 PALAEOGEOGR PALAEOCL JI Paleogeogr. Paleoclimatol. Paleoecol. PD MAR PY 1992 VL 92 IS 1-2 BP 107 EP 119 DI 10.1016/0031-0182(92)90137-T PG 13 WC Geography, Physical; Geosciences, Multidisciplinary; Paleontology SC Physical Geography; Geology; Paleontology GA HQ857 UT WOS:A1992HQ85700007 ER PT J AU HIROMOTO, R WIENKE, BR BRICKNER, RG AF HIROMOTO, R WIENKE, BR BRICKNER, RG TI THE PERFORMANCE OF ASYNCHRONOUS ITERATION SCHEMES APPLIED TO THE LINEARIZED BOLTZMANN TRANSPORT-EQUATION SO PARALLEL COMPUTING LA English DT Article DE ASYNCHRONOUS ITERATION; BOLTZMANN TRANSPORT EQUATION; SHARED MEMORY MULTIPROCESSOR SYSTEM; DISTRIBUTED MEMORY MULTIPROCESSOR SYSTEM; PERFORMANCE ANALYSIS AB We present a summary of numerical experiments that explore the effects of asynchronous (chaotic) iteration schemes for solutions of the Boltzmann transport equation. Our experiments are performed on both common and distributed memory parallel processing systems. Two chaotic and one deterministic schemes are developed directly from a computational algorithm known as discrete ordinates that uses iterative techniques in solving the linearized Boltzmann particle transport equation. From an analysis based on the performance of these schemes on various parallel architectures, a third chaotic scheme is developed that executes faster in either parallel or sequential modes. The behavior of these methods, both deterministic and chaotic, will be examined for the Denelcor HEP, the Encore Multimax, and the Intel iPSC hypercube. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV APPL THEORET PHYS, LOS ALAMOS, NM 87545 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, DIV COMP & COMMUN, LOS ALAMOS, NM 87545 USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 EI 1872-7336 J9 PARALLEL COMPUT JI Parallel Comput. PD MAR PY 1992 VL 18 IS 3 BP 241 EP 268 DI 10.1016/0167-8191(92)90095-O PG 28 WC Computer Science, Theory & Methods SC Computer Science GA HK690 UT WOS:A1992HK69000001 ER PT J AU WANG, HY NAJAFABADI, R SROLOVITZ, DJ LESAR, R AF WANG, HY NAJAFABADI, R SROLOVITZ, DJ LESAR, R TI SEGREGATION TO SIGMA-5 [001] TWIST GRAIN-BOUNDARIES IN NI-CU ALLOYS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID EMBEDDED-ATOM-METHOD; SURFACE SEGREGATION; METALS; EMBRITTLEMENT; AU AB Atomistic simulations of segregation to the SIGMA-5 [001] twist boundary in Ni-Cu alloys have been performed for a wide range of temperature and composition all within the solid solution region of the phase diagram. In addition to the grain boundary segregation profile, grain boundary structures, free energies, enthalpies, and entropies were determined. These simulations were performed within the framework of the free energy simulation method, in which an approximate free energy functional is minimized with respect to atomic coordinates and atomic site occupation. For all alloy bulk compositions (0.05 less-than-or-equal-to C less-than-or-equal-to 0.95) and temperatures (400 less-than-or-equal-to T(K) less-than-or-equal-to 1000) examined, Cu segregates strongly to the grain boundary. The width of the segregation profile is limited to approximately two atomic planes on each side. The resultant segregation profiles are shown to be in poor agreement with classical segregation theories. The grain boundary thermodynamic properties depend sensitively on the magnitude of the grain boundary segregation. The free energy, enthalpy, entropy of segregation and the change in grain boundary excess volume are shown to be linearly proportional to the magnitude of the grain boundary segregation. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP WANG, HY (reprint author), UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109, USA. RI LeSar, Richard/G-1609-2012 NR 28 TC 19 Z9 19 U1 2 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD MAR PY 1992 VL 65 IS 3 BP 625 EP 655 PG 31 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA HK372 UT WOS:A1992HK37200005 ER PT J AU RASHID, MM GRAY, GT NEMATNASSER, S AF RASHID, MM GRAY, GT NEMATNASSER, S TI HETEROGENEOUS DEFORMATIONS IN COPPER SINGLE-CRYSTALS AT HIGH AND LOW STRAIN RATES SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID PLASTIC-DEFORMATION; METALS; ALUMINUM; ENERGY; SOLIDS AB In polycrystalline materials, the microscopic strain field is always highly heterogeneous during inelastic deformation, even when the macroscopic strain field is uniform. This is particularly true near potential damage and failure nucleation sites, such as voids and inclusions. Also, in the context of high-strain-rate plastic flow, the only currently practical way to induce large strains and high strain rates simultaneously under experimental conditions is by means of heterogenous deformations. For these and other reasons, experiments involving highly heterogeneous deformations are of considerable interest. A joint experimental/computational study of heterogeneous deformations in copper single crystals will be presented. Carefully oriented, monocrystalline copper specimens were subjected to large-strain indentation at both high and low strain rates. The high-rate experiments were performed using a split Hopkinson pressure bar high-strain-rate apparatus. Scanning and transmission electron microscopy performed on the deformed specimens revealed strikingly different deformation morphologies and dislocation substructures between the two strain rates. In general, the substructure of the high-rate specimens showed relatively little evidence of dynamic recovery processes as compared to that of the low-rate specimens. This finding tends to support the notion of strain-rate sensitivity of structure evolution in face-centred cubic metals. A series of finite element simulations of the experiment was performed using the explicit finite element code PRONTO2D, into which a rate-dependent crystal plasticity constitutive theory has been implemented. In the constitutive model, the effects of strain-rate-dependent substructure evolution were simulated through the inclusion of a strain-rate-history-dependent hardening parameter. Comparison of the experimental and computational results reveals that strain-rate history has a profound influence on deformation morphology at medium to high strain rates. Also, the comparison serves to highlight the importance of proper characterization of both instantaneous rate-sensitivity and strain-rate-history effects. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. RP UNIV CALIF SAN DIEGO, DEPT APPL MECH & ENGN SCI, CTR EXCELLENCE ADV MAT, MAIL CODE R-011, LA JOLLA, CA 92093 USA. NR 44 TC 23 Z9 23 U1 1 U2 19 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD MAR PY 1992 VL 65 IS 3 BP 707 EP 735 PG 29 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA HK372 UT WOS:A1992HK37200009 ER PT J AU WANG, ZL AF WANG, ZL TI DYNAMICS OF THERMAL DIFFUSE-SCATTERING IN HIGH-ENERGY ELECTRON-DIFFRACTION AND IMAGING - THEORY AND EXPERIMENTS SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID STEM LATTICE IMAGES; KIKUCHI PATTERNS AB A dynamical theory is proposed to calculate the diffraction patterns of electrons which have undergone thermal diffuse scattering (TDS). The lattice dynamics and electron diffraction dynamics are comprehensively combined in this approach. Full dynamical simulations are presented for Mo(001). Under the single-inelastic-scattering approximation and in the near-zone-axis case, the sharpness of the TDS streaks is determined by the phonon dispersion relationships of the acoustic branches, the optical branches contribute only a diffuse background, and dynamical scattering effects can change the intensity distribution of TDS electrons but have almost no effect on the sharpness of TDS streaks. The TDS streaks are defined by the q(x)-q(y) curves which satisfy omega(j)(q) = 0, where omega(j)(q) is the phonon dispersion relationship determined by the two-dimensional atomic vibrations in the (hkl) plane perpendicular to the incident beam direction B = [hkl]. The directions of TDS streaks predicted according to these procedures are consistent with those predicted according to the q.[r(l)-r(l1)] = 0 rule given by Wang and Bentley, where the summation of l1 is restricted to the first-nearest neighbours of the lth atom that are located in the same atomic plane as the lth atom perpendicular to the incidence beam direction. Atomic resolution images can be formed by TDS electrons in transmission electron microscopy. The image theory is equivalent to the incoherent imaging theory if the spherical aberration coefficient C(s) for the objective lens is small. The image resolution may be higher than that formed by pure elastically scattered electrons, but the 'inclined-incidence effect' (i.e. the correction of momentum transfer q to the electron wave-vector K) in phonon scattering may distort the image. The phase coupling of vibrating atoms does not affect calculations for images but does affect diffraction patterns. Thus the image simulation can be performed based on the Einstein model as long as the correct vibration amplitude for each atom is used. Equivalent results are obtained for the TDS electrons based on either the quantum inelastic scattering theory or the 'frozen'-lattice model of the semiclassical approach if the temperature is not much higher than room temperature. C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 43 TC 18 Z9 18 U1 2 U2 11 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD MAR PY 1992 VL 65 IS 3 BP 559 EP 587 DI 10.1080/13642819208207650 PG 29 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA HK369 UT WOS:A1992HK36900013 ER PT J AU REDDY, NRS LYLE, PA SMALL, GJ AF REDDY, NRS LYLE, PA SMALL, GJ TI APPLICATIONS OF SPECTRAL HOLE BURNING SPECTROSCOPIES TO ANTENNA AND REACTION CENTER COMPLEXES SO PHOTOSYNTHESIS RESEARCH LA English DT Review DE ENERGY TRANSFER; PHOTOSYSTEM-I; PHOTOSYSTEM-II; RHODOBACTER-SPHAEROIDES; PROSTHECOCHLORIS-AESTUARII ID PHOTOSYNTHETIC REACTION CENTERS; PRIMARY ELECTRON-DONOR; BACTERIOCHLOROPHYLL-A-PROTEIN; RHODOBACTER-SPHAEROIDES R-26; BACTERIAL REACTION CENTERS; VIRIDIS REACTION CENTERS; PICOSECOND PHOTON-ECHO; LIGHT-HARVESTING COMPLEXES; ENERGY-TRANSFER DYNAMICS; CHARGE SEPARATION RATE AB The underlying principles of spectral hole burning spectroscopies and the theory for hole profiles are reviewed and illustrated with calculated spectra. The methodology by which the dependence of the overall hole profile on burn wavelength can be used to reveal the contributions from site inhomogeneous broadening and various homogeneous broadening contributions to the broad Q(y)-absorption bands of cofactors is emphasized. Applications to the primary electron donor states of the reaction centers of purple bacteria and Photosystems I and II of green plants are discussed. The antenna (light harvesting) complexes considered include B800-B850 and B875 of Rhodobacter sphaeroides and the base-plate complex of Prosthecochloris aestuarii with particular attention being given to excitonic interactions and level structure. The data presented show that spectral hole burning is a generally applicable low temperature approach for the study of excited state electronic and vibrational (intramolecular, phonon) structures, structural heterogeneity and excited state lifetimes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP REDDY, NRS (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 120 TC 108 Z9 110 U1 0 U2 5 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD MAR PY 1992 VL 31 IS 3 BP 167 EP 194 DI 10.1007/BF00035536 PG 28 WC Plant Sciences SC Plant Sciences GA HQ980 UT WOS:A1992HQ98000002 PM 24408059 ER PT J AU CROW, JE SULLIVAN, NS PARKIN, DM AF CROW, JE SULLIVAN, NS PARKIN, DM TI THE UNITED-STATES NATIONAL HIGH MAGNETIC-FIELD LABORATORY - STATUS AND OVERVIEW SO PHYSICA B LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON RESEARCH ON HIGH MAGNETIC FIELDS A SATELLITE OF THE 3RD INTERNATIONAL CONF ON MAGNETISM ( ICM 91 ) CY AUG 29-31, 1991 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS, UNIV AMSTERDAM, KATHOLIEKE UNIV NIJMEGEN, HOEK LOOS IND GASSES, OXFORD INSTRUMENTS, ELSEVIER SCI PUBL, OCE COPIERS, IBM NEDERLAND HO UNIV AMSTERDAM ID GRENOBLE AB In August 1990, the United States National Science Foundation announced that it would provide support for the establishment of a new National High Magnetic Field Laboratory to be jointly operated by Florida State University, the University of Florida and Los Alamos National Laboratory. This new laboratory will develop continuous and pulsed magnet systems and the necessary research support infrastructure to meet the needs of the United States and foreign user communities at the highest attainable magnetic fields. In addition, the new laboratory will establish an in-house science and engineering program to further the development of magnet related research and technology. The continuous field facilities will be located in Tallahassee, Florida, with the pulsed facilities located at Los Alamos National Laboratory, Los Alamos, New Mexico. Work has commenced on the development of this new laboratory. C1 UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP CROW, JE (reprint author), FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,KEEN BLDG,TALLAHASSEE,FL 32306, USA. NR 9 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 MAR PY 1992 VL 177 IS 1-4 BP 16 EP 21 DI 10.1016/0921-4526(92)90057-Y PG 6 WC Physics, Condensed Matter SC Physics GA HP250 UT WOS:A1992HP25000004 ER PT J AU MUELLER, FM AF MUELLER, FM TI DEHAAS-VANALPHEN MEASUREMENTS IN TYPE-II SUPERCONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON RESEARCH ON HIGH MAGNETIC FIELDS A SATELLITE OF THE 3RD INTERNATIONAL CONF ON MAGNETISM ( ICM 91 ) CY AUG 29-31, 1991 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS, UNIV AMSTERDAM, KATHOLIEKE UNIV NIJMEGEN, HOEK LOOS IND GASSES, OXFORD INSTRUMENTS, ELSEVIER SCI PUBL, OCE COPIERS, IBM NEDERLAND HO UNIV AMSTERDAM ID SURFACE AB Measurements of the de Haas-van Alphen effect in YBCO carried out by Fowler et al. using fields over 100 T and temperatures between 2.4 and 4.0 K are reviewed. Samples were oriented so that the c or (0 0 1) axis lay along the magnetic field direction. Three distinct external cross-sectional orbital frequencies at 0.53, 0.78 and 3.51 kT were found. But in this work no transition through B(c2) was observed in this regime. Tentatively, it has been hypothesized that B(c2) may be higher than 100 T at 2.4 K in Los Alamos samples. If this is the case then the dHvA effect seen in these experiments may involve quantal oscillations, periodic in 1/B, in fields below B(c2). Such an effect was first observed by Graebner and Robbins in NbSe2 in 1976. Additional experiments illustrating a dHvA effect below B(c2) in V3Si will be presented using a theoretical analysis of experiments of Lowndes and Arko. The theoretical situation of the dHvA effect in superconductors below B(c2) is reviewed. RP MUELLER, FM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 17 TC 1 Z9 2 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 MAR PY 1992 VL 177 IS 1-4 BP 41 EP 45 DI 10.1016/0921-4526(92)90062-W PG 5 WC Physics, Condensed Matter SC Physics GA HP250 UT WOS:A1992HP25000009 ER PT J AU HAANAPPEL, EG HEDDERICH, R JOSS, W ASKENAZY, S FISK, Z AF HAANAPPEL, EG HEDDERICH, R JOSS, W ASKENAZY, S FISK, Z TI DEHAAS-VANALPHEN EFFECT IN CEB6 IN FIELDS UP TO 52-T - REDUCTION OF THE CYCLOTRON MASS AND NEW FREQUENCIES SO PHYSICA B LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON RESEARCH ON HIGH MAGNETIC FIELDS A SATELLITE OF THE 3RD INTERNATIONAL CONF ON MAGNETISM ( ICM 91 ) CY AUG 29-31, 1991 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS, UNIV AMSTERDAM, KATHOLIEKE UNIV NIJMEGEN, HOEK LOOS IND GASSES, OXFORD INSTRUMENTS, ELSEVIER SCI PUBL, OCE COPIERS, IBM NEDERLAND HO UNIV AMSTERDAM ID FERMI AB The de Haas-van Alphen effect is used to study CeB6 in pulsed fields up to 52 T. Two cyclotron orbits are observed; a previously unreported orbit may be due to magnetic breakdown. The cyclotron masses corresponding to these orbits decrease with increasing field. C1 INSA,CNRS,SERV CHAMPS MAGNET INTENSES,F-31077 TOULOUSE,FRANCE. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP HAANAPPEL, EG (reprint author), MAX PLANCK INST FESTKORPERFORSCH,BP 166,38042 GRENOBLE 9,FRANCE. NR 9 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD MAR PY 1992 VL 177 IS 1-4 BP 181 EP 184 DI 10.1016/0921-4526(92)90092-7 PG 4 WC Physics, Condensed Matter SC Physics GA HP250 UT WOS:A1992HP25000039 ER PT J AU HEIL, O DUBOIS, RD MAIER, R KUZEL, M GROENEVELD, KO AF HEIL, O DUBOIS, RD MAIER, R KUZEL, M GROENEVELD, KO TI IONIZATION IN FAST-NEUTRAL-PARTICLE ATOM COLLISIONS - H AND HE ATOMS IMPACTING ON HE SO PHYSICAL REVIEW A LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; MULTIPLE-IONIZATION; SINGLE AB Experimental and theoretical data pertaining to the doubly differential electron emission occurring in collisions between structured projectiles and atoms are presented. How one or two loosely bound projectile electrons influence the ionization process was investigated for fast H- and He-atom impact on helium. Standard noncoincidence and ionized projectile-emitted-electron coincidence techniques were used to study the electron emission for 0.5- and 1-MeV/amu impact energies. The experimental data demonstrate the importance of events where both the projectile and the target are ionized in a single collision. From a comparison of theoretical calculations made using the first-order Born approximation and the experimental data, it is concluded that single ionization of the target and of the projectile are adequately described by such a model but that improved models are essential in order to account for the observed simultaneous projectile-target ionization events. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP HEIL, O (reprint author), UNIV FRANKFURT, INST KERNPHYS, AUGUST EULER STR 6, W-6000 FRANKFURT, GERMANY. NR 25 TC 16 Z9 16 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP 2850 EP 2858 DI 10.1103/PhysRevA.45.2850 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700031 ER PT J AU RESCIGNO, TN SCHNEIDER, BI AF RESCIGNO, TN SCHNEIDER, BI TI ELECTRON-IMPACT EXCITATION OF THE T AND V STATES OF ETHYLENE - AN ABINITIO STUDY SO PHYSICAL REVIEW A LA English DT Article ID KOHN VARIATIONAL METHOD; GAUSSIAN BASIS FUNCTIONS; ATOMIC BASIS SETS; FIRST-ROW ATOMS; CROSS-SECTIONS; POLYATOMIC-MOLECULES; SCATTERING; COLLISIONS; H-2; APPROXIMATION AB We report total and differential cross sections for electron-impact excitation of the T (a approximately 3B1u) and V (1B1u) states of ethylene from threshold to 20 eV. The calculations were carried out using the complex Kohn variational method. For collision energies above the threshold for excitation of the V state, we carried out three-state close-coupling calculations using accurate multiconfiguration target states. An averaged natural orbital technique was used to obtain a compact representation of the V-state wave function that properly reflects the mixed valence-Rydberg character of this state. The total and small-angle differential cross sections for exciting the optically allowed V state are sensitive to the inclusion of high partial-wave contributions, which were computed using a simple perturbative scheme. In the energy range between the T and V states, where only two electronic states are open, we carried out dressed two-state calculations using optical potential techniques to incorporate the effect of closed channels. We found significant d-wave resonance behavior in the T-state excitation cross section near 5 eV. At higher energies, the T-state differential cross sections are backward peaked, while the V state cross sections show strong forward peaking that is typical of an optically allowed transition. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP RESCIGNO, TN (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB, POB 808, L438, LIVERMORE, CA 94550 USA. NR 52 TC 77 Z9 76 U1 1 U2 5 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 MAR 1 PY 1992 VL 45 IS 5 BP 2894 EP 2902 DI 10.1103/PhysRevA.45.2894 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700035 ER PT J AU SHINPAUGH, JL SANDERS, JM HALL, JM LEE, DH SCHMIDTBOCKING, H TIPPING, TN ZOUROS, TJM RICHARD, P AF SHINPAUGH, JL SANDERS, JM HALL, JM LEE, DH SCHMIDTBOCKING, H TIPPING, TN ZOUROS, TJM RICHARD, P TI ELECTRON-CAPTURE AND TARGET IONIZATION IN COLLISIONS OF BARE PROJECTILE IONS INCIDENT ON HELIUM SO PHYSICAL REVIEW A LA English DT Article ID ATOMS; HE; COINCIDENCE; SINGLE AB Absolute cross sections for the processes of single capture, transfer ionization, and single and double ionization were measured for C6+, N7+, O8+, and F9+ projectiles incident on a helium target in the projectile velocity range of 0.25-2.0 MeV/amu. The cross sections were determined by measuring projectile-ion final charge states in coincidence with target recoil-ion final charge states. The single-capture and transfer-ionization cross sections were corrected for ionization from impurity charge states in the beam and for double-collision processes in the target gas cell. These corrections, which are necessary for the relative as well as the absolute cross sections, were found to be as large as 50% of the cross section. The measured cross sections are compared to the multistate, coupled-channel calculations of Shingal and Lin using an independent-electron model. C1 RES CTR CRETE,DEPT PHYS,IRAKLION,GREECE. UNIV CRETE,IRAKLION,GREECE. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. KANSAS STATE UNIV AGR & APPL SCI,JR MACDONALD LAB,MANHATTAN,KS 66506. RI Sanders, Justin/A-7940-2009; Zouros, Theo/C-7212-2011 OI Zouros, Theo/0000-0002-5124-2128 NR 14 TC 32 Z9 35 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP 2922 EP 2928 DI 10.1103/PhysRevA.45.2922 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700038 ER PT J AU ZHANG, Y REDDY, CB SMITH, RS GOLDEN, DE MUELLER, DW GREGORY, DC AF ZHANG, Y REDDY, CB SMITH, RS GOLDEN, DE MUELLER, DW GREGORY, DC TI TOTAL CROSS-SECTIONS OF ELECTRON-IMPACT IONIZATION OF AR-7+ SO PHYSICAL REVIEW A LA English DT Article ID NA-LIKE IONS; EXCITATION; ATOMS; AL2+; SI3+; MG+ AB The electron-impact single-ionization cross section of Ar7+ has been measured from 18 to 1186 eV using a crossed-beams technique. The present results are higher than previous measurements at the higher energies and are in good agreement with recent distorted-wave calculations that include contributions from excitation autoionization. Below the threshold for direct ionization at 144 eV, the cross section contains contributions due to space-charge modulation and excitation of metastable ions in the target beam into autoionizing states. These transitions are predominantly spin allowed and dipole forbidden. Scaling laws for sodiumlike ions are discussed. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP ZHANG, Y (reprint author), UNIV N TEXAS,DEPT PHYS,DENTON,TX 76203, USA. NR 34 TC 18 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP 2929 EP 2934 DI 10.1103/PhysRevA.45.2929 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700039 ER PT J AU DITTNER, PF VANE, CR KRAUSE, HF DELCAMPO, JG JONES, NL VANEMMICHOVEN, PAZ BECHTHOLD, U DATZ, S AF DITTNER, PF VANE, CR KRAUSE, HF DELCAMPO, JG JONES, NL VANEMMICHOVEN, PAZ BECHTHOLD, U DATZ, S TI SEARCH FOR A NARROW RESONANT TRANSFER AND EXCITATION RESONANCE OF TITANIUM PROJECTILES CHANNELED IN A GOLD CRYSTAL SO PHYSICAL REVIEW A LA English DT Article ID DIELECTRONIC-RECOMBINATION; ELECTRON-CAPTURE; CROSS-SECTION; IONS; COLLISIONS; STATE AB Transfer and excitation, resulting from simultaneous electron capture and K-shell excitation in a single collision, has been measured 280-310-MeV Ti20+ ions channeled in the <100> axis of a thin Au single crystal. The 19+ charge-state fraction of the Ti ions exiting the Au crystal was measured as a function of ion energy and showed no narrow peak attributable to resonant transfer and excitation (RTE). The number of Ti K alpha x rays, emitted by the Ti ions due to RTE, in coincidence with Ti19+ was also measured at two energies, on and off the previously reported narrow resonance, and again no evidence for a narrow resonance was observed. RP DITTNER, PF (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 21 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP 2935 EP 2939 DI 10.1103/PhysRevA.45.2935 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700040 ER PT J AU ZHOU, B KISSEL, L PRATT, RH AF ZHOU, B KISSEL, L PRATT, RH TI NEAR-THRESHOLD STRUCTURES IN ANOMALOUS SCATTERING FACTORS SO PHYSICAL REVIEW A LA English DT Article ID DISPERSION CORRECTION; PHOTO-IONIZATION; DATA-BASE; X-RAYS; PHOTOIONIZATION; ATOMS; IONS AB Photoionization cross sections of atoms often display various structures near thresholds, such as Cooper minima and shape resonances. In view of the dispersion relation connecting the real amplitude of Rayleigh scattering (elastic photon scattering from atomic electrons) and the photoeffect cross section, one may expect that the structures in photoionization cross sections imply corresponding features in the real anomalous scattering factor, which also can now be quite precisely measured experimentally. In this paper we study the detailed structures of the real anomalous scattering factor f', in an effort to understand the connections with structures in the photoeffect cross section. C1 SANDIA NATL LABS,DIV TEST PLANNING & DIAGNOST,ALBUQUERQUE,NM 87185. RP ZHOU, B (reprint author), UNIV PITTSBURGH,DEPT PHYS & ASTRON,PITTSBURGH,PA 15260, USA. NR 25 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP 2983 EP 2988 DI 10.1103/PhysRevA.45.2983 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700047 ER PT J AU REINHOLD, CO BURGDORFER, J KEMMLER, J KOSCHAR, P AF REINHOLD, CO BURGDORFER, J KEMMLER, J KOSCHAR, P TI SIMULATION OF CONVOY-ELECTRON EMISSION SO PHYSICAL REVIEW A LA English DT Note ID CARBON FOILS; RYDBERG STATES; IONS; DISTRIBUTIONS; TRANSPORT; HYDROGEN; TARGETS AB We present a microscopic simulation of convoy-electron production and transport through solids. Using a classical transport theory, we calculate the forward-ejected electron spectrum for 3-MeV/u H-0 projectiles traversing carbon foils of different thicknesses. We find excellent agreement with experiment in both shape and absolute magnitude of the convoy-electron spectrum over a wide range of electron energies and foil thicknesses. Our study provides detailed information on the relative importance of competing pathways contributing to convoy-electron emission. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV FRANKFURT,INST KERNPHYS,W-6000 FRANKFURT,GERMANY. RP REINHOLD, CO (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 30 TC 25 Z9 25 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP R2655 EP R2658 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700001 ER PT J AU LIU, AY COHEN, ML AF LIU, AY COHEN, ML TI THEORETICAL-STUDY OF A HYPOTHETICAL METALLIC PHASE OF CARBON SO PHYSICAL REVIEW B LA English DT Article ID DIAMOND; PRESSURE; SOLIDS AB We have studied the structural properties and electronic structure of a hypothetical, all-sp2 phase of carbon using the first-principles pseudopotential total-energy method. The phase, called bct-4 C, is found to be a low-compressibility metal. Because of the nearly perfect lattice match with the diamond (100) surface, we suggest that it may be possible to epitaxially grow bct-4 C on the diamond (100) surface. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Liu, Amy/E-2266-2015 OI Liu, Amy/0000-0002-2011-1854 NR 17 TC 47 Z9 47 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 4579 EP 4581 DI 10.1103/PhysRevB.45.4579 PG 3 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800004 ER PT J AU CREUTZ, M AF CREUTZ, M TI COUNTING WORLD LINES FOR MANY-FERMION SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID PARTITION-FUNCTION; APPROXIMANTS; MECHANICS AB I explore a recursive enumeration of world-line diagrams as a numerical approach to simulating many-fermion lattice systems. Signs from fermion exchange are treated exactly. In addition, all values of the coupling constants are treated simultaneously. The method is computationally fast, although large-memory requirements restrict it to small spatial systems. RP CREUTZ, M (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 14 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 4650 EP 4655 DI 10.1103/PhysRevB.45.4650 PG 6 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800013 ER PT J AU ZHANG, JG LEHMAN, GW EKLUND, PC AF ZHANG, JG LEHMAN, GW EKLUND, PC TI ALGORITHM FOR DETERMINING LO-PHONON-MODE PARAMETERS FROM OPTICAL-REFLECTANCE DATA - APPLICATION TO HIGH-TC CUPRATES SO PHYSICAL REVIEW B LA English DT Article ID LA2CUO4 AB An algorithm is proposed to derive the longitudinal-optic-phonon-mode parameters from reflectance spectra applicable when the mode damping is moderate to weak. The algorithm, which can easily be performed using commercial software for a personal computer, leads to a unique set of mode parameter values that satisfy both the generalized Lyddane-Sachs-Teller relation and the sum rule. As examples, we apply our algorithm to optical-reflectance data on La2CuO4-delta and Nd2CuO4-delta and obtain values for the transverse and longitudinal frequencies and associated damping. The results are compared with other methods commonly used in the literature. C1 UNIV KENTUCKY, DEPT PHYS & ASTRON, LEXINGTON, KY 40506 USA. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 4660 EP 4666 DI 10.1103/PhysRevB.45.4660 PG 7 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800015 ER PT J AU LIVERMAN, WJ HUBER, JG MOODENBAUGH, AR XU, YW AF LIVERMAN, WJ HUBER, JG MOODENBAUGH, AR XU, YW TI SUPERCONDUCTIVITY UNDER PRESSURE OF LA2-XBAXCUO4(0.05-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.25) AND ND1.85CE0.15CUO4-DELTA SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; PHASE; TRANSITION; SYSTEM; LA2-XBAXCUO4; TEMPERATURE; COMPOUND AB The superconducting transition temperature T versus pressure p (< 18 kbar) was determined for La2-xBaxCuO4 (x = 0.05, 0.08, 0.12, 0.125, 0.145, 0.175, and 0.25) and for Nd1.85Ce0.15CuO4-delta. The pressure was applied hydrostatically. Transition temperatures were determined using a mutual-inductance technique. For the Ba system, T(c)'s rise under pressure. The highest dT(c)/dp (0.6 K/kbar) was observed for compositions x = 0.12 and 0.125 at which the T(c) at zero pressure is below 4 K. The results are compared with previous results for Ba and for Sr. Our results for x = 0.12 and 0.125 (broad transitions, an apparently smooth increase in T(c) with pressure, and T(c)'s relatively low at all pressures) suggest that samples do not transform to a (higher-T(c)) crystallographic phase under pressure. The T(c) for Nd1.85Ce0.15CuO4 is found to be essentially pressure independent. C1 BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973. RP LIVERMAN, WJ (reprint author), SCI MUSEUM VIRGINIA,2500 W BROAD ST,RICHMOND,VA 23220, USA. NR 20 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 4897 EP 4900 DI 10.1103/PhysRevB.45.4897 PG 4 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800044 ER PT J AU RADAELLI, PG SEGRE, CU HINKS, DG JORGENSEN, JD AF RADAELLI, PG SEGRE, CU HINKS, DG JORGENSEN, JD TI STRUCTURAL INHOMOGENEITIES IN OXYGEN-DEFICIENT ERBA2CU3O6+X ASSOCIATED WITH THE TETRAGONAL-TO-ORTHORHOMBIC TRANSITION - EVIDENCE OF 1ST-ORDER BEHAVIOR SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON POWDER DIFFRACTION; 60-K BULK SUPERCONDUCTOR; LOW-TEMPERATURE BEHAVIOR; CU-O CHAINS; PHASE-DIAGRAM; ANNEALED BA2YCU3O7-DELTA(0.3-LESS-THAN-DELTA-LESS-THAN-0.4); STOICHIOMETRY; YBA2CU3OZ; VACANCIES; PLATEAUS AB Neutron powder diffraction and ac susceptibility data on a series of ErBa2Cu3O6 + x samples prepared to achieve thermal equilibrium at low temperature provide evidence of structural inhomogeneities near the tetragonal-to-orthorhombic (T --> O) transition. In the composition range 0.25 less-than-or-equal-to x less-than-or-equal-to 0.45, the data can best be described as a mixture of orthorhombic and tetragonal phases. This observation, together with the presence of discontinuities in the order parameters, leads to the conclusion that the T --> O transition is first order in the temperature range where these samples were prepared. This interpretation provides a simple explanation for the differences between oxygen-deficient R Ba2Cu3O6 + x (R = Y, rare earths) samples prepared by different techniques. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP RADAELLI, PG (reprint author), IIT,DEPT PHYS,CHICAGO,IL 60616, USA. RI Radaelli, Paolo/C-2952-2011; Segre, Carlo/B-1548-2009 OI Radaelli, Paolo/0000-0002-6717-035X; Segre, Carlo/0000-0001-7664-1574 NR 30 TC 47 Z9 47 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 MAR 1 PY 1992 VL 45 IS 9 BP 4923 EP 4949 DI 10.1103/PhysRevB.45.4923 PG 27 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800049 ER PT J AU BECKER, PC WILLIAMS, GM EDELSTEIN, NM KONINGSTEIN, JA BOATNER, LA ABRAHAM, MM AF BECKER, PC WILLIAMS, GM EDELSTEIN, NM KONINGSTEIN, JA BOATNER, LA ABRAHAM, MM TI OBSERVATION OF STRONG ELECTRON-PHONON COUPLING EFFECTS IN YBPO4 SO PHYSICAL REVIEW B LA English DT Note ID RARE-EARTH COMPOUNDS; FERROMAGNET LITBF4; RAMAN-SCATTERING; OPTICAL PHONONS; FIELD; LUPO4 AB The electronic and vibrational Raman spectra of a single crystal of YbPO4 have been investigated. The E(g) phonon at 310 cm-1 is found to have an anomalously large Raman linewidth of 50 cm-1 at room temperature. Particularly striking was the observation that this transition is split into several separate transitions that move apart in energy as the temperature is lowered. The magnitude of these effects is very large. These observations are interpreted on the basis of electron-phonon coupling, and phenomenological calculations are presented and compared with the experimental data. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. CARLETON UNIV,DEPT CHEM,OTTAWA K1S 5B6,ONTARIO,CANADA. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 21 TC 40 Z9 41 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 5027 EP 5031 DI 10.1103/PhysRevB.45.5027 PG 5 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800065 ER PT J AU BELKHIR, L RANDERIA, M AF BELKHIR, L RANDERIA, M TI COLLECTIVE EXCITATIONS AND THE CROSSOVER FROM COOPER PAIRS TO COMPOSITE BOSONS IN THE ATTRACTIVE HUBBARD-MODEL SO PHYSICAL REVIEW B LA English DT Note ID BOSE CONDENSATION; SUPERCONDUCTIVITY; GAS; SYSTEM AB Motivated by the short coherence length of the high-temperature superconductors, we study in the negative-U Hubbard model the crossover from Cooper pairs for U << t to composite bosons for U >> t. We compute the collective-mode spectrum using a generalized random-phase-approximation analysis within the equations-of-motion formalism. We find a smooth evolution of the Anderson mode for weak coupling into the Bogoliubov sound mode for hard-core bosons. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BELKHIR, L (reprint author), SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794, USA. NR 24 TC 36 Z9 36 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 MAR 1 PY 1992 VL 45 IS 9 BP 5087 EP 5090 DI 10.1103/PhysRevB.45.5087 PG 4 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800082 ER PT J AU DESSAU, DS SHEN, ZX WELLS, BO KING, DM SPICER, WE ARKO, AJ LOMBARDO, LW MITZI, DB KAPITULNIK, A AF DESSAU, DS SHEN, ZX WELLS, BO KING, DM SPICER, WE ARKO, AJ LOMBARDO, LW MITZI, DB KAPITULNIK, A TI NATURE OF THE HIGH-BINDING-ENERGY DIP IN THE LOW-TEMPERATURE PHOTOEMISSION SPECTRA OF BI2SR2CACU2O8+DELTA SO PHYSICAL REVIEW B LA English DT Note ID ANGLE-RESOLVED-PHOTOEMISSION; SINGLE-CRYSTALS; SUPERCONDUCTING GAP; PLANE; SPECTROSCOPY; SURFACE AB At the transition to superconductivity, an anomalous high-binding-energy (almost-equal-to -90 meV) dip appears in the low-temperature photoemission spectra taken along the GAMMA-MBAR high-symmetry direction of Bi2Sr2CaCu2O8 + delta. This paper details experiments which further characterize the energy and k-space dependence of this dip structure. The dip occurs over a wide portion of the GAMMA-MBAR zone diagonal (110), yet shows minimal energy dispersion. In the spectra taken along the GAMMA-X zone edge (100), the dip is very weak or not present. We show that these results imply that the dip is not an artifact dependent on the experiment or special features of the band structure and therefore is an intrinsic feature of the superconducting state of Bi2Sr2CaCu2O8 + delta. The behavior of the normal-state bands along GAMMA-MBAR in relation to the local-density-approximation prediction of a Bi-O-based electron "pocket" is also discussed, with our data explained most naturally if the Bi-O band remains above the Fermi level for all k. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. RP DESSAU, DS (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. RI Mitzi, David/B-6260-2012 OI Mitzi, David/0000-0001-5189-4612 NR 22 TC 28 Z9 28 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 5095 EP 5098 DI 10.1103/PhysRevB.45.5095 PG 4 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800084 ER PT J AU YOU, H WELP, U CRABTREE, GW FANG, Y SINHA, SK AXE, JD JIANG, X MOSS, SC AF YOU, H WELP, U CRABTREE, GW FANG, Y SINHA, SK AXE, JD JIANG, X MOSS, SC TI X-RAY CRYSTAL-TRUNCATION-ROD ANALYSIS OF UNTWINNED YBA2CU3O7-DELTA SINGLE-CRYSTALS - THE GROWTH-TERMINATION PLANE SO PHYSICAL REVIEW B LA English DT Note ID SURFACES; DIFFRACTION; SCATTERING AB Crystal truncation rods (CTR's), or x-ray scattering from a terminated surface of a three-dimensional single crystal, were measured for untwinned single crystals of YBa2Cu3O7 - delta. An expression for the intensity along the CTR's, which may be directly applied to a structure with a complicated unit cell, was derived from a Bloch wave expansion of the electron density. Data analysis using this expression indicates that the most probable metal-containing layer at the terminating surface of a flux-grown YBa2Cu3O7 - delta single crystal is the Y layer. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204. RP YOU, H (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 12 TC 13 Z9 13 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 MAR 1 PY 1992 VL 45 IS 9 BP 5107 EP 5110 DI 10.1103/PhysRevB.45.5107 PG 4 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800087 ER PT J AU COCKROFT, NJ JONES, GD NGUYEN, DC AF COCKROFT, NJ JONES, GD NGUYEN, DC TI DYNAMICS AND SPECTROSCOPY OF INFRARED-TO-VISIBLE UP-CONVERSION IN ERBIUM-DOPED CESIUM CADMIUM BROMIDE (CSCDBR3-ER3+) SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-TRANSFER; COUPLED PAIRS; CALCIUM-FLUORIDE; GD3+ IONS; CRYSTALS; CSMGBR3; LUMINESCENCE; RELAXATION; CSMGCL3; FLUORESCENCE AB Trivalent erbium ions in CsCdBr3 exist predominantly as dimers along one-dimensional lattice chains. Very efficient upconversion from near-infrared to various visible wavelengths was observed. H-2(9/2) --> 4I15/2 (414 nm) and 4F7/2 --> 4I15/2 (493 nm) fluorescence dominated for 4I15/2 --> 4I9/2 (801 nm) and 4I15/2 --> 4I11/2 (984 nm) excitation, respectively. Simultaneous excitation at 801 and 984 nm preferentially populated 4F5/2, giving 4F5/2 --> 4I15/2 (455 nm), 4F5/2 --> 4I13/2 (651 nm), and, by cross relaxation, 4F9/2 --> 4I15/2 (671 nm). The efficiency of multiple-color upconversion is attributed to low phonon energies and close coupling between ions. Upconversion mechanisms are proposed, and energy-transfer rates determined from the temporal transients. C1 UNIV CANTERBURY,DEPT PHYS,CHRISTCHURCH 1,NEW ZEALAND. RP COCKROFT, NJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,MAILSTOP J564,LOS ALAMOS,NM 87545, USA. NR 35 TC 64 Z9 64 U1 3 U2 9 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 MAR 1 PY 1992 VL 45 IS 10 BP 5187 EP 5198 DI 10.1103/PhysRevB.45.5187 PG 12 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900008 ER PT J AU BATISTIC, I BISHOP, AR AF BATISTIC, I BISHOP, AR TI RANDOM-PHASE-APPROXIMATION APPROACH TO PHONON-SPECTRA IN DOPED AND UNDOPED HALOGEN-BRIDGED TRANSITION-METAL COMPOUNDS SO PHYSICAL REVIEW B LA English DT Article ID TIGHT-BINDING APPROXIMATION; LINEAR-CHAIN COMPLEXES; PEIERLS-HUBBARD MODEL; N-ELECTRONS SYSTEM; POLYACETYLENE (CH)X; SOLITON; EXCITATIONS; POLARON; STATES AB We have developed a method based on a real-space random-phase approximation (RPA) to study the phonon spectra of doped and undoped halogen-bridged transition-metal-chain complexes. The method is very convenient in cases of spatially inhomogeneous mean-field structures. Thus, we are able to find the usual extended phonon modes as well as local modes associated with polaron, bipolaron, kink, exciton, or impurity structures in intrinsically or extrinsically doped systems. The corresponding infrared absorption spectra and Raman spectra (as a function of the excitation energy) are calculated. We demonstrate the method for a homogeneous charge-density-wave system, and for electron and hole polarons. We find that each type of defect has specific signatures in both infrared and Raman spectra, which can help to identify different types of defects experimentally. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 32 TC 29 Z9 31 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5282 EP 5292 DI 10.1103/PhysRevB.45.5282 PG 11 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900019 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI ONSET OF LONG-RANGE ORDER IN A PARAMAGNET SO PHYSICAL REVIEW B LA English DT Article ID UNIVERSAL CRITERION; SUPERCONDUCTIVITY; FLUCTUATIONS; DIMENSIONS AB The onset of long-range order in a paramagnet is studied using an expansion in powers of 1/z, where z is the number of nearest neighbors. Rather than expand the correlation function itself, we expand the self-energy in powers of 1/z. For both the Ising and Heisenberg models of ferromagnetism, the long-range correlations diverge at the true, shifted Curie temperature. Therefore, the magnetic and paramagnetic results of the 1/z expansion are consistent. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FISHMAN, RS (reprint author), N DAKOTA STATE UNIV,DEPT PHYS,SU STN BOX 5566,FARGO,ND 58105, USA. RI Fishman, Randy/C-8639-2013 NR 21 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 MAR 1 PY 1992 VL 45 IS 10 BP 5406 EP 5413 DI 10.1103/PhysRevB.45.5406 PG 8 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900032 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI NONLINEAR DYNAMICS OF A HEISENBERG-FERROMAGNET SO PHYSICAL REVIEW B LA English DT Article ID SPIN DYNAMICS; EUS AB Using an expansion technique we study the dynamics of a spin-s Heisenberg ferromagnet with nearest-neighbor exchange coupling J. The transverse-mode frequencies are calculated by expanding a self-energy function in powers of 1/z, where z is the number of nearest neighbors on the lattice. To zeroth-order in 1/z, the mode frequencies agree with the random-phase approximation. To the next order in 1/z, the coupling between the transverse and longitudinal fluctuations is responsible for a shift in the spin-wave (SW) frequencies omega(k) and for the appearance of a second pole in the correlation function at an energy close to zJs. This second mode is excited by longitudinal fluctuations, which force the local spin to precess about the mean field with frequency zJs rather than with the spin-wave frequency omega(k). Because of its interactions with the surrounding spins, this precession can propagate through the lattice. When omega(k) is close to zJs, the precessional mode may be observable as a splitting of the transverse resonance into two peaks. Since the coupling between the longitudinal and transverse fluctuations becomes exponentially small at low temperatures, the precessional mode only appears above the crossover temperature TBAR almost-equal-to 0.2zJs. Because the SW approximation mishandles the subtle interplay between the longitudinal and transverse fluctuations, it misses the second pole in the correlation function. In agreement with earlier work we find that the SW approximation breaks down above the temperature TBAR, when the exponential coupling terms in the correlation function become significant. Although the precessional mode is induced by longitudinal fluctuations, it is fundamentally a transverse excitation and must be distinguished from the longitudinal mode, which has zero frequency. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FISHMAN, RS (reprint author), N DAKOTA STATE UNIV,DEPT PHYS,SU STN BOX 5566,FARGO,ND 58105, USA. RI Fishman, Randy/C-8639-2013 NR 17 TC 7 Z9 7 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5414 EP 5427 DI 10.1103/PhysRevB.45.5414 PG 14 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900033 ER PT J AU EMIN, D AF EMIN, D TI LARGE-BIPOLARON TRANSPORT AND CUPRATE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; LARGE ACOUSTIC POLARON; ONE DIMENSION; CU-O; DYNAMICS AB The in-plane electronic transport of large bipolarons that move within parallel conducting sheets is considered. The Coulomb interactions between the heavy bipolarons in this planar system produce a distinctive spectrum for collective excitations. Transport of the quasiparticles associated with the collective excitations is treated via the conventional Boltzmann transport theory. However, the scattering of the heavy quasiparticles by acoustic phonons is taken to be analogous to the distinctive scattering of individual large polarons. In particular, as with strong-coupling (adiabatic) large polarons, the scattering time is taken to be proportional to the quasiparticle effective mass. The resistivity, the Hall effect, and the thermoelectric power are determined with this scheme. With a constant density of carriers, the resistivity is proportional to the temperature. The Hall number, the number of carriers deduced from the reciprocal of the Hall constant, exceeds the true carrier density by a ratio that rises linearly with temperature. In addition, the thermoelectric power falls in magnitude and ultimately changes sign as the temperature is raised. These unusual transport properties, as well as the ir conductivity, are consistent with the observed behaviors of the high-T(c) cuprate superconductors. RP EMIN, D (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 23 TC 45 Z9 45 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5525 EP 5529 DI 10.1103/PhysRevB.45.5525 PG 5 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900044 ER PT J AU YONEMITSU, K BISHOP, AR AF YONEMITSU, K BISHOP, AR TI RANDOM-PHASE-APPROXIMATION APPROACH TO OPTICAL AND MAGNETIC EXCITATIONS IN THE 2-DIMENSIONAL MULTIBAND HUBBARD-MODEL SO PHYSICAL REVIEW B LA English DT Article AB As a convenient qualitative approach to strongly correlated electronic systems, an inhomogeneous Hartree-Fock plus random-phase approximation is applied to response functions for the two-dimensional multiband Hubbard model for cuprate superconductors. A comparison of the results with those obtained by exact diagonalization by Wagner, Hanke, and Scalapino [Phys. Rev. B 43, 10 517 (1991)] shows that overall structures in optical and magnetic particle-hole excitation spectra are well reproduced by this method. This approach is computationally simple, retains conceptual clarity, and can be calibrated by comparison with exact results on small systems. Most importantly, it is easily extended to larger systems and straightforward to incorporate additional terms in the Hamiltonian, such as electron-phonon interactions, which may play a crucial role in high-temperature superconductivity. RP YONEMITSU, K (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 TC 15 Z9 15 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5530 EP 5534 DI 10.1103/PhysRevB.45.5530 PG 5 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900045 ER PT J AU JIN, W DEGANI, MH KALIA, RK VASHISHTA, P AF JIN, W DEGANI, MH KALIA, RK VASHISHTA, P TI SUPERCONDUCTIVITY IN BA1-XKXBIO3 SO PHYSICAL REVIEW B LA English DT Article ID K-BI-O; MELT-CAST BA0.65K0.35BIO3; STRUCTURAL PHASE-DIAGRAM; HIGH-TC BA0.6K0.4BIO3; UPPER CRITICAL-FIELD; CHARGE-DENSITY WAVE; ELECTRONIC-STRUCTURE; OXYGEN ISOTOPE; OXIDE SUPERCONDUCTORS; TUNNELING SPECTROSCOPY AB Superconductivity in Ba1-xKxBiO3 is studied within the framework of Eliashberg theory using a model of the electron-phonon interaction, alpha(2)F(omega). The model is based upon molecular-dynamics calculations of the phonon density of states, which are in good agreement with inelastic-neutron-scattering experiments. The function alpha(omega) is constructed using information from electron-tunneling experiments. Our model is constructed with the premise that the electron-phonon coupling constant lambda almost-equal-to 1 and that strong electron-phonon coupling exists for high-energy (30-60 meV) phonon modes. Superconducting properties of the material at zero and finite temperatures are calculated and compared with experiments. C1 LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP JIN, W (reprint author), LOUISIANA STATE UNIV,CONCURRENT COMP LAB MAT SIMULAT,BATON ROUGE,LA 70803, USA. NR 140 TC 22 Z9 22 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5535 EP 5546 DI 10.1103/PhysRevB.45.5535 PG 12 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900046 ER PT J AU TOBIN, JG OLSON, CG GU, C LIU, JZ SOLAL, FR FLUSS, MJ HOWELL, RH OBRIEN, JC RADOUSKY, HB STERNE, PA AF TOBIN, JG OLSON, CG GU, C LIU, JZ SOLAL, FR FLUSS, MJ HOWELL, RH OBRIEN, JC RADOUSKY, HB STERNE, PA TI VALENCE BANDS AND FERMI-SURFACE TOPOLOGY OF UNTWINNED SINGLE-CRYSTAL YBA2CU3O6.9 SO PHYSICAL REVIEW B LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; ELECTRONIC-STRUCTURE; SUPERCONDUCTING GAP; RAMAN-SCATTERING; LOW-DENSITY; CU-O; BI2SR2CACU2O8; YBA2CU3O7-DELTA; ENERGY; STATES AB The cleaved surfaces of untwinned, single-crystal YBa2Cu3O6.9 have been probed with synchrotron-radiation photoemission, utilizing both high energy and angular resolution. Acute spectral structure was observed, both at the Fermi energy and at higher binding energies, particularly near the high-symmetry points of the two-dimensional Brillouin zone, GAMMABAR, XBAR, YBAR, and SBAR. Many band crossings of the Fermi energy were seen, with obvious and important differences between the bands near XBAR and those near YBAR. A large superconducting gap was not observed: The data are consistent with a gap of less than 10 meV. The assignment of bands and Fermi-level crossings to chain and plane states will be discussed, including comparisons to the predictions of theory, particularly local-density-approximation calculations. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. AMES LAB,AMES,IA 50011. RP TOBIN, JG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 59 TC 94 Z9 95 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5563 EP 5576 DI 10.1103/PhysRevB.45.5563 PG 14 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900050 ER PT J AU WOOD, RF COOKE, JF AF WOOD, RF COOKE, JF TI D9 SPIN-POLARON THEORY OF HIGH-TC SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; ELECTRONIC-STRUCTURE; YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES; BIPOLARONIC SUPERCONDUCTIVITY; HOLE CONCENTRATION; LANTHANUM CUPRATE; RAMAN-SCATTERING; SINGLE-CRYSTALS; OXYGEN SITES; LA2CUO4 AB The results of further studies of a d9 spin-polaron model of high-T(c) superconductivity are reported. Calculations of their formation energies suggest that spin polarons involving the Cu d9 configuration and O 2p sigma orbitals in the CuO2 planes should form readily in the high-T(c) superconductors. Estimates of their radii and effective masses indicate that they are small spin polarons with masses approximately four times the band effective mass. Formation of spin polarons destroys the long-range antiferromagnetic (AF) ordering but repair of the AF order locally provides a pairing mechanism. Parametrized AF band calculations for a CuO2 plane show how a Mott-Hubbard (MH) gap opens as a consequence of an electron repulsion energy U at the Cu sites. The parameters are chosen to give agreement with the measured density of states, the magnetic moment per Cu site, and other data. Variation of the hole concentration by Sr doping in La2-xSrxCuO4 and O depletion in YBa2Cu3O7-x moves the Fermi level relative to the MH band edge. Approximate expressions for the gap and T(c) within the framework of a Cooper-pairing approach are derived and then solved using information from the band calculations. The proximity of the Fermi level to the MH band edge and the interplay of O 2p sigma and 2p pi bands and/or localization effects can provide good fits to the variations of T(c) with x in La2-xSrxCuO4 and YBa2Cu3O7-x. The in-plane gap is either s- or d-like but anisotropic in either case. A discussion of various aspects and implications of the model is given. RP WOOD, RF (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 98 TC 20 Z9 20 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5585 EP 5606 DI 10.1103/PhysRevB.45.5585 PG 22 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900052 ER PT J AU LIU, R VEAL, BW PAULIKAS, AP DOWNEY, JW SHI, H OLSON, CG GU, C ARKO, AJ JOYCE, JJ AF LIU, R VEAL, BW PAULIKAS, AP DOWNEY, JW SHI, H OLSON, CG GU, C ARKO, AJ JOYCE, JJ TI ELECTRONIC-STRUCTURE NEAR EF IN YBA2CU3OX FOR 6.35 LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 6.9 - A PHOTOEMISSION-STUDY SO PHYSICAL REVIEW B LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; CHARGE-TRANSFER EXCITATIONS; SUPERCONDUCTING ENERGY-GAP; CA-CU-O; FERMI-SURFACE; PHOTOELECTRON-SPECTROSCOPY; TEMPERATURE; BI2SR2CACU2O8; STATE; ORDER AB High-resolution angle-resolved photoemission measurements are reported for YBa2Cu3Ox when oxygen stoichiometries are in the range 6.35 less-than-or-equal-to x less-than-or-equal-to 6.9. The stoichiometry dependence of spectral features at energies close to the Fermi level was monitored along major symmetry lines in the two-dimensional Brillouin zone. Along GAMMABAR-SBAR, two bands dispersing through E(F) were observed in YBa2Cu3O6.9. Band calculations indicate that these are "plane"-related features. These two bands and the Fermi surfaces that they define are nearly independent of oxygen stoichiometry. The spectral weight near E(F) is relatively constant for 6.4 less-than-or-equal-to x less-than-or-equal-to 6.9. However, the spectral weight falls off significantly when x = 6.35 (insulating), although the dispersive behavior that is characteristic of the higher oxygen stoichiometries persists. This abrupt intensity change might signal the onset of an electronic structure governed by strong correlation. Along GAMMABAR-YBAR(XBAR), one band dispersing through E(F) was observed in YBa2Cu3O6.9. As oxygen was removed, the intensity of this dispersive feature decreased systematically. Predictions of band theory indicate that this band is a "chain"-related feature. In general, predictions of band theory appear to be quite reliable near E(F) in the oxygen stoichiometry range x greater-than-or-equal-to 6.4, where the material shows metallic behavior. C1 AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP LIU, R (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 43 TC 95 Z9 95 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 MAR 1 PY 1992 VL 45 IS 10 BP 5614 EP 5621 DI 10.1103/PhysRevB.45.5614 PG 8 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900054 ER PT J AU ALEXANDER, KB GOYAL, A KROEGER, DM SELVAMANICKAM, V SALAMA, K AF ALEXANDER, KB GOYAL, A KROEGER, DM SELVAMANICKAM, V SALAMA, K TI MICROSTRUCTURE WITHIN DOMAINS OF MELT-PROCESSED YBA2CU3O7-X SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID SINGLE GRAIN-BOUNDARIES; CURRENT-DENSITY; WEAK-LINK; ANISOTROPY AB The microstructure within single domains of melt-processed YBa2Cu3O7-x (1:2:3) material has been examined. Rather than composing a "brick-wall" structure, the stacked, parallel platelets within the domains are actually portions of a single crystal. A growth mechanism is proposed that is consistent with the observed microstructural features. The anisotropic nature of the growth of 1:2:3 results in gaps separating the platelets. The gaps, however, terminate within domains, resulting in interconnected single-crystalline material. The absence of weak-link behavior for current flow along the c axis and the high critical-current densities observed within domains of melt-processed 1:2:3 material are readily explained by the fact that current flow is solely through single-crystalline material. C1 UNIV HOUSTON,TEXAS CTR SUPERCOND,HOUSTON,TX 77004. RP ALEXANDER, KB (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 23 TC 87 Z9 87 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5622 EP 5627 DI 10.1103/PhysRevB.45.5622 PG 6 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900055 ER PT J AU WANG, XL STASSIS, C JOHNSTON, DC LEUNG, TC YE, J HARMON, BN LANDER, GH SCHULTZ, AJ LOONG, CK HONIG, JM AF WANG, XL STASSIS, C JOHNSTON, DC LEUNG, TC YE, J HARMON, BN LANDER, GH SCHULTZ, AJ LOONG, CK HONIG, JM TI NEUTRON-DIFFRACTION STUDY OF THE ANTIFERROMAGNETIC FORM-FACTOR OF LA2NIO4 SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC CORRELATIONS; SPIN DYNAMICS; LA2CUO4; SCATTERING AB Neutron-diffraction techniques have been used to study the antiferromagnetic form factor of a La2NiO4 single crystal at 15 K. The antiferromagnetic form factor was obtained by measuring the integrated intensities of 16 magnetic reflections. A plateau is clearly seen at low Q (up to 3 angstrom-1) in the experimentally determined form factor, similar to those observed for La2CuO4 and Sr2CuO2Cl2. The magnetization density deduced from the experimental data exhibits strong ansiotropy in the Ni-O plane. The experimental data are compared with covalency models and a recent spin-polarized band calculation. C1 COMMISS EUROPEAN,JOINT RES CTR,W-7500 KARLSRUHE,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP WANG, XL (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Wang, Xun-Li/C-9636-2010 OI Wang, Xun-Li/0000-0003-4060-8777 NR 26 TC 22 Z9 22 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5645 EP 5653 DI 10.1103/PhysRevB.45.5645 PG 9 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900059 ER PT J AU YANG, XQ XUE, KH LEE, HS MCBREEN, J SKOTHEIM, TA LU, F AF YANG, XQ XUE, KH LEE, HS MCBREEN, J SKOTHEIM, TA LU, F TI X-RAY-ABSORPTION STUDIES OF ORGANODISULFIDE REDOX POLYMERIC ELECTRODES SO PHYSICAL REVIEW B LA English DT Note ID BATTERIES AB We have measured the near-edge x-ray-absorption fine-structure (NEXAFS) spectra of the K edge of sulfur in organodisulfide redox polymeric electrodes in both charged and discharged states. The formation and scission of S-S bonding during the charge-discharge cycle were observed through NEXAFS spectroscopy. C1 MOLTECH CORP,STONY BROOK,NY 11794. UNIV KENTUCKY,CFFLS,LEXINGTON,KY 40506. RP YANG, XQ (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 4 TC 7 Z9 10 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 MAR 1 PY 1992 VL 45 IS 10 BP 5733 EP 5736 DI 10.1103/PhysRevB.45.5733 PG 4 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900079 ER PT J AU DIAMANTINI, MC SODANO, P AF DIAMANTINI, MC SODANO, P TI ANYON REPRESENTATION OF THE GROUND-STATE DEGENERACY OF THE QUANTUM FRUSTRATED XY MODEL SO PHYSICAL REVIEW B LA English DT Note ID TRANSVERSE MAGNETIC-FIELDS; JOSEPHSON-JUNCTION ARRAYS; MASSIVE GAUGE-THEORIES; CHIRAL SPIN STATES; FRACTIONAL STATISTICS; PHASE-TRANSITION; BLOCH ELECTRONS; WAVE-FUNCTIONS; HUBBARD-MODEL; SYSTEMS AB We use the extension of the Jordan-Wigner transformation to planar systems to investigate the quantum frustrated XY model for spin 1/2 on a square lattice. We find that this model is mapped into the hopping Hamiltonian for a planar spinless electron in a transverse magnetic field. When we fix the frustration parameter to be a rational number such that the electron density is proportional to the total flux threading the plaquette, the model is equivalent to a Z(N) gauge theory of anyons. The Z(N) symmetry of the anyon theory implies a degeneracy 2N for the ground state of the model considered. Since we regard the frustration field as classical background, our approach has to be considered as a mean-field theory of the frustrated spin model. We briefly discuss the effect of quantum corrections to the ground-state degeneracy. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDY,LOS ALAMOS,NM 87545. NR 55 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5737 EP 5739 DI 10.1103/PhysRevB.45.5737 PG 3 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900080 ER PT J AU BORSA, F CORTI, M GOTO, T RIGAMONTI, A JOHNSTON, DC CHOU, FC AF BORSA, F CORTI, M GOTO, T RIGAMONTI, A JOHNSTON, DC CHOU, FC TI CL-35 NMR-STUDY OF SPIN DYNAMICS IN SR2CUO2CL2 SO PHYSICAL REVIEW B LA English DT Note ID HEISENBERG-ANTIFERROMAGNET; LA2CUO4 AB Measurements of the Cl-35 nuclear-spin-lattice relaxation rate (NSLR) are reported for Sr2CuO2Cl2 around the antiferromagnetic transition temperature T(N) = 260 +/- 0.5 K. The temperature dependence of the Cu2+ spin correlation length xi(T) is obtained indirectly by using the conventional description of NSLR and scaling arguments and compared with the xi(T) obtained in La2CuO4 by neutron scattering. In both systems xi(T) follows the two-dimensional Heisenberg behavior renormalized by quantum fluctuations except close to T(N) where a crossover to a power-law T dependence is observed in Sr2CuO2Cl2. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. RP BORSA, F (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 19 TC 28 Z9 28 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 MAR 1 PY 1992 VL 45 IS 10 BP 5756 EP 5759 DI 10.1103/PhysRevB.45.5756 PG 4 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900085 ER PT J AU PERRINO, R DELEO, R BACHER, AD EMERY, GT GLOVER, CW NANN, H OLMER, C JANSSENS, RVF VANDERWERF, SY AF PERRINO, R DELEO, R BACHER, AD EMERY, GT GLOVER, CW NANN, H OLMER, C JANSSENS, RVF VANDERWERF, SY TI LOW-LYING EXCITATIONS IN YB-176 AND HF-180 FROM (P-],P') SCATTERING AT EP = 98.4 MEV SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING BOSON MODEL; ENERGY OCTUPOLE RESONANCE; INELASTIC-SCATTERING; TRANSITION MOMENTS; MULTIPOLE MOMENTS; DEFORMED-NUCLEI; STATES; STRENGTH; PROTONS; IBA AB The low-lying excited states of two rotational nuclei, Yb-176 and Hf-180, have been investigated up to an excitation energy of 3.5 MeV by means of high-resolution inelastic scattering of 98.4-MeV polarized protons. The spins and excitation strengths of the observed levels have been deduced by comparing the measured cross sections and asymmetries with coupled-channel calculations. The deduced quadrupole, hexadecapole, and octupole strengths have been compared with the predictions of the interacting boson model in the sdg- and sdf-boson schemes. C1 SEZIONE IST NAZL FIS NUCL,I-73100 LECCE,ITALY. ARGONNE NATL LAB,ARGONNE,IL 60439. INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405. KERNFYS VERSNELLER INST,9747 AA GRONINGEN,NETHERLANDS. RP PERRINO, R (reprint author), UNIV LECCE,I-73100 LECCE,ITALY. RI Perrino, Roberto/B-4633-2010 OI Perrino, Roberto/0000-0002-5764-7337 NR 22 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1017 EP 1023 DI 10.1103/PhysRevC.45.1017 PG 7 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200017 ER PT J AU GREGORICH, KE HALL, HL HENDERSON, RA LEYBA, JD CZERWINSKI, KR KREEK, SA KADKHODAYAN, BA NURMIA, MJ LEE, DM HOFFMAN, DC AF GREGORICH, KE HALL, HL HENDERSON, RA LEYBA, JD CZERWINSKI, KR KREEK, SA KADKHODAYAN, BA NURMIA, MJ LEE, DM HOFFMAN, DC TI FISSION BRANCH IN LR-259 AND CONFIRMATION OF LR-258 AND LR-259 MASS ASSIGNMENTS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY ACTINIDES; EXCITATION-FUNCTIONS; ELEMENT-105; CM-248; CF-249; O-16 AB The mass assignments for the activities previously assigned to 259Lr and 258Lr have been confirmed. The 259Lr and 258Lr were produced by the Cm-248(N-15,4n) and Cm-248(N-15,5n) reactions, respectively. The Lr alpha-activities were measured directly using our rotating wheel system. Mass assignments were made by an alpha-daughter recoil catcher technique in which the Md-255 and Md-254 daughters were caught on aluminum foils placed directly above the rotating wheel. The alpha-decay of the 20.07-h Fm-255 and the 3.24-h Fm-254 granddaughter activities in these aluminum foils were then measured and correlations with the decay of the Lr parent activities were made based on the distribution of the Fm activities among the Al foils, which corresponded to the half-lives of the parent Lr alpha-activities. We have determined the half-lives for 259Lr and 258Lr to be 6.34(-0.42)(+0.46) and 3.92(-0.31)(+0.35) s, respectively. The spontaneous-fission branch in 259Lr was measured to be 23 +/- 2%. The spontaneous-fission mass distribution appears to be broadly symmetric and the average total kinetic energy is estimated to be 200 +/- 10 MeV. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP GREGORICH, KE (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,MS 70A-3307,BERKELEY,CA 94720, USA. OI Hall, Howard/0000-0002-4080-5159 NR 23 TC 17 Z9 17 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1058 EP 1063 DI 10.1103/PhysRevC.45.1058 PG 6 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200021 ER PT J AU KRATZ, JV GOBER, MK ZIMMERMANN, HP SCHADEL, M BRUCHLE, W SCHIMPF, E GREGORICH, KE TURLER, A HANNINK, NJ CZERWINSKI, KR KADKHODAYAN, B LEE, DM NURMIA, MJ HOFFMAN, DC GAGGELER, H JOST, D KOVACS, J SCHERER, UW WEBER, A AF KRATZ, JV GOBER, MK ZIMMERMANN, HP SCHADEL, M BRUCHLE, W SCHIMPF, E GREGORICH, KE TURLER, A HANNINK, NJ CZERWINSKI, KR KADKHODAYAN, B LEE, DM NURMIA, MJ HOFFMAN, DC GAGGELER, H JOST, D KOVACS, J SCHERER, UW WEBER, A TI NEW NUCLIDE HA-263 SO PHYSICAL REVIEW C LA English DT Article ID SYSTEMATICS AB A new nuclide 263Ha was produced in the bombardment of a Bk-249 target with 93-MeV O-18 ions. It was detected via spontaneous fission counting and was shown to have a half-life of about 0.5 min. This activity was also separated from the reaction products by automated rapid chemical separations using cation-exchange chromatography in 0.05M alpha-hydroxyisobutyric acid. After chemical separation, 263Ha was found to decay by spontaneous fission (57(-15)+13%) and by alpha-emission (E(alpha) = 8.35 MeV, 43%) with a half-life of 27(-7)+10 s. The spontaneous fission fragment energy spectrum is compatible with an average total kinetic energy of about 200 MeV. C1 GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RP KRATZ, JV (reprint author), UNIV MAINZ,INST KERNCHEM,W-6500 MAINZ,GERMANY. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 19 TC 48 Z9 48 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1064 EP 1069 DI 10.1103/PhysRevC.45.1064 PG 6 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200022 ER PT J AU MUSTAFA, MG BLANN, M IGNATYUK, AV GRIMES, SM AF MUSTAFA, MG BLANN, M IGNATYUK, AV GRIMES, SM TI NUCLEAR-LEVEL DENSITIES AT HIGH EXCITATIONS SO PHYSICAL REVIEW C LA English DT Article ID DECAY AB We calculate level densities for Ne-20, Ca-40, and Ru-100 nuclei using unrestricted uniform, single particle levels (Fermi gas) and for realistic levels restricted to those bound by centripetal and Coulomb forces. For the latter we use single particle levels due to Seeger, and results for a Woods-Saxon model. We show that the Fermi gas formulas become completely inadequate at temperatures well within the range of those relevant to heavy-ion reaction studies. We discuss likely consequences of these discrepancies with respect to the likelihood of forming equilibrated nuclei at these temperatures, and discuss possible pit-falls of interpreting reactions at high excitations using unrestricted Fermi gas formulas. C1 OHIO UNIV,ATHENS,OH 45701. OBNINSK PHYS & POWER ENGN INST,OBNINSK,USSR. RP MUSTAFA, MG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 TC 26 Z9 26 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1078 EP 1083 DI 10.1103/PhysRevC.45.1078 PG 6 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200024 ER PT J AU CARR, JA BLOOM, SD PETROVICH, F PHILPOTT, RJ AF CARR, JA BLOOM, SD PETROVICH, F PHILPOTT, RJ TI FRAGMENTATION OF STRETCHED SPIN STRENGTH IN N = Z SD-SHELL NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID INELASTIC ELECTRON-SCATTERING; PARTICLE-HOLE STATES; UNNATURAL-PARITY STATES; MAGNETIC TRANSITIONS; PROTON-SCATTERING; ANALYZING POWERS; MODEL TREATMENT; WAVE-FUNCTIONS; A=4-16 NUCLEI; LIGHT-NUCLEI AB Calculations have been performed to explore the effect of configuration mixing in a large basis on the fragmentation of "stretched" M6 strength in the sd-shell nuclei Ne-20, Mg-24, Si-28, S-32, and Ar-36. This work elaborates on results for Si-28 given previously, extends those calculations to neighboring N = Z nuclei with the same basis restriction (one particle in the 1f7/2 orbit and up to four particles in the 1d3/2 orbit) used in that earlier paper, and examines all self-conjugate sd-shell nuclei in a basis with one particle in the 1f7/2 orbit and unrestricted occupancy of the sd-shell orbits. It is found that configuration mixing in a large basis reproduces interesting features of the spectrum for Si-28 and S-32 and gives an improved description of other properties of the observed 6- states, but fails to describe the observed spectrum in Mg-24. Emphasis is placed on the location of additional observable fragments of the M6 response. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. RP CARR, JA (reprint author), FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306, USA. NR 81 TC 10 Z9 10 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1145 EP 1161 DI 10.1103/PhysRevC.45.1145 PG 17 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200031 ER PT J AU CHIBA, S GUENTHER, PT SMITH, AB SUGIMOTO, M LAWSON, RD AF CHIBA, S GUENTHER, PT SMITH, AB SUGIMOTO, M LAWSON, RD TI FAST-NEUTRON INTERACTION WITH ELEMENTAL ZIRCONIUM, AND THE DISPERSIVE OPTICAL-MODEL SO PHYSICAL REVIEW C LA English DT Article ID ENERGY-DEPENDENCE; CROSS-SECTIONS; MEAN FIELD; SCATTERING; YTTRIUM AB Differential neutron elastic- and inelastic-scattering cross sections of elemental zirconium were measured from almost-equal-to 1.5 to 10 MeV. Below 3 MeV the measurements were made at incident-neutron energy intervals of almost-equal-to 100 keV, from 3 to 4 MeV in steps of almost-equal-to 200 keV, and in almost-equal-to 500 keV increments at higher energies. The angular range of the measurements is almost-equal-to 18-degrees to 160-degrees, with up to more than 100 differential values per distribution. This comprehensive database, augmented with a 24 MeV elastic-scattering distribution from the literature, is used to develop two phenomenological optical-statistical models, both of which describe the date very well. First, the parameters of the conventional spherical optical model (SOM) are deduced. Second, the model in which the dispersion relationship, linking real and imaginary interactions (DOM), is considered. The SOM parameters are consistent with systematics previously reported from this laboratory, and the volume integral per nucleon of the real potential strength, J(v), and the radius, r(v), are energy dependent. Although the energy dependence of J(v) is reduced by about 30% in going from the SOM to the DOM, there is little change in the E variation of r(v) between the two models. Both models are extrapolated to the bound-state regime where they have modest success in predicting the binding energies of the single-particle and single-hole states in Zr-90. RP CHIBA, S (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 56 TC 25 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1260 EP 1275 DI 10.1103/PhysRevC.45.1260 PG 16 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200039 ER PT J AU HOMOLKA, J SCHOTT, W WAGNER, W WILHELM, W SABER, M SEGEL, RE BENT, RD FATYGA, M POLLOCK, RE KIENLE, P REHM, KE AF HOMOLKA, J SCHOTT, W WAGNER, W WILHELM, W SABER, M SEGEL, RE BENT, RD FATYGA, M POLLOCK, RE KIENLE, P REHM, KE TI MEASUREMENT OF THE C-12(P,PI-0)N-13 REACTION BY RECOIL DETECTION SO PHYSICAL REVIEW C LA English DT Article ID C-12(HE-3,PI+)N-15 REACTION; ENERGY-DEPENDENCE; POLARIZED PROTONS; THRESHOLD AB Differential cross sections for the neutral pion production reaction C-12(p, pi(0))N-13(g.s.) have been measured at 153.5, 166.1, 186.0, and 204.0 MeV bombarding energy using recoil detection. The shape of the angular distribution agrees well with that of the mirror reaction C-12(p, pi+)C-13(g.s.). Isopin invariance predicts for the ratio of the cross sections sigma(p, pi+)/sigma(p, pi(0)) = 2. At 153.5, 166.1, and 186.0 MeV, where (p, pi+) cross sections have been reported previously by other groups at the same reduced pion momentum eta = p-pi/m(pi)c = 0.34, 0.55, 0.78, the ratio of the total cross sections is 2.02 +/- 0.14, 3.14 +/- 0.12, and 2.12 +/- 0.16, respectively. The (p, pi(0)) cross section at 166 MeV is therefore 1.57 +/- 0.06 times larger than expected. For T(p) < 160 MeV, the experimental cross sections are larger than predicted by a phase space and Coulomb barrier penetration calculation that fits the higher-energy data. Differential cross sections were also obtained for the C-12(p, pi-)O-13 reaction, and upper limits set for differential cross sections for radiative capture to the ground state of N-13. C1 NORTHWESTERN UNIV,EVANSTON,IL 60208. INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47408. GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. RP HOMOLKA, J (reprint author), TECH UNIV MUNICH,DEPT PHYS,W-8000 MUNICH 2,GERMANY. RI Homolka, Josef/D-1843-2009; OI Homolka, Josef/0000-0001-8565-0907 NR 21 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1276 EP 1283 DI 10.1103/PhysRevC.45.1276 PG 8 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200040 ER PT J AU MOODY, KJ HULET, EK PRICE, PB AF MOODY, KJ HULET, EK PRICE, PB TI SEARCH FOR CLUSTER RADIOACTIVITY OF NP-237 SO PHYSICAL REVIEW C LA English DT Note ID HEAVY-NUCLEI; DECAY; EMISSION AB The few odd-A nuclides known to exhibit cluster radioactivity decay at rates hindered with respect to their even-even neighbors. For Np-237, the most likely clusters are predicted to be Mg-30 and Si-32. We have completed a rigorous search for cluster emission from Np-237, with a null result. Our 90% confidence limit on the branching ratio with respect to alpha emission, B (cluster/alpha) < 1.8 x 10(-14), is a factor 4.3 lower than the limit obtained by Tretyakova et al. The two experiments together place an upper limit of 1.5 x 10(-14) on the branching ratio for emission of clusters with 10 less-than-or-equal-to Z less-than-or-equal-to 14 from Np-237. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP MOODY, KJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550, USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP 1392 EP 1393 DI 10.1103/PhysRevC.45.1392 PG 2 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200053 ER PT J AU HARTMANN, FX AF HARTMANN, FX TI POSSIBILITY OF OBSERVING MASSIVE NEUTRINO ADMIXTURES IN NUCLEAR ORBITAL ELECTRON-CAPTURE RATES SO PHYSICAL REVIEW C LA English DT Note ID 17-KEV NEUTRINO; BETA-SPECTRUM; HO-163; DECAY AB The unusual case in nuclear orbital electron capture whereby either a neutrino in a weak interaction eigenstate or in a mass eigenstate is emitted by the same nucleus is examined. The case of the low-energy Q value nuclear electron capture decays is considered where, for at least one electronic shell, the emission of a weak eigenstate neutrino having an admixture of a second mass eigenstate neutrino (with mass in the keV/c2 range) is energetically prohibited. This feature, in particular, opens the possibility for a new approach to searching for massive neutrino admixtures using relative electron capture rates. Five candidates are specifically identified, of which one, Tb-157, is conceivably of immediate interest to the 17 KeV/c2 neutrino mass question. Finally experimental prospects and limitations are described. RP HARTMANN, FX (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 20 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1992 VL 45 IS 3 BP R900 EP R903 DI 10.1103/PhysRevC.45.R900 PG 4 WC Physics, Nuclear SC Physics GA HJ692 UT WOS:A1992HJ69200004 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y FUNAYAMA, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, H INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LISS, TM LIMON, P LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PARA, A PARE, E PARK, S PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SEKIGUCHI, M SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YAMASHITA, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y FUNAYAMA, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, H INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LISS, TM LIMON, P LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PARA, A PARE, E PARK, S PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SEKIGUCHI, M SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YAMASHITA, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI TOPOLOGY OF 3-JET EVENTS IN PBARP COLLISIONS AT SQUARE-ROOT-S=1.8 TEV SO PHYSICAL REVIEW D LA English DT Article ID HADRON COLLISIONS; JETS; COLLIDER AB The production and event topology of three-jet events produced in ppBAR collisions at square-root s = 1.8 TeV have been studied with the Collider Detector at Fermilab at the Tevatron Collider. The distributions of the three-jet angular variables (psi* and cos-theta*) and of the variables describing the energy sharing between jets (x3 and x4) are found to agree well with tree-level QCD calculations. These distributions are predicted to have different shapes for different initial-state subprocesses (quark-antiquark, quark-gluon, and gluon-gluon). The data are consistent with the small expected contribution from quark-antiquark initial states, in agreement with theoretical expectations. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,OHO,IBARAKI 305,JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052 NR 25 TC 287 Z9 287 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAR 1 PY 1992 VL 45 IS 5 BP 1448 EP 1458 DI 10.1103/PhysRevD.45.1448 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HH419 UT WOS:A1992HH41900002 ER PT J AU DASGUPTA, U BORDER, P JOHNS, K LONGLEY, N MARSHAK, M PETERSON, E RUDDICK, K SHUPE, M AYRES, D DAWSON, J FIELDS, T GOODMAN, M MAY, E AF DASGUPTA, U BORDER, P JOHNS, K LONGLEY, N MARSHAK, M PETERSON, E RUDDICK, K SHUPE, M AYRES, D DAWSON, J FIELDS, T GOODMAN, M MAY, E TI COINCIDENCES BETWEEN EXTENSIVE AIR SHOWERS AND THE SOUDAN-1 UNDERGROUND MUON DETECTOR SO PHYSICAL REVIEW D LA English DT Article ID COSMIC-RAYS; HIGH-ENERGY; EVENTS AB We have operated the Soudan 1 underground muon detector in coincidence with a 36-m2 detector situated at the Earth's surface. Such a combination of detectors can yield information on the composition of the primary cosmic rays at energies above approximately 3 x 10(15) eV, where there is an abrupt change in the slope of the energy spectrum. The present experiment was meant to test the feasibility of operating such a system, and to obtain a first sample of data before the complete installation of the much larger Soudan 2 detector. These initial data seem to favor a light composition in the energy range 10(15)-10(16) eV, but there are significant systematic uncertainties. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP DASGUPTA, U (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455, USA. RI Marshak, Marvin/B-8645-2008 NR 25 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAR 1 PY 1992 VL 45 IS 5 BP 1459 EP 1469 DI 10.1103/PhysRevD.45.1459 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HH419 UT WOS:A1992HH41900003 ER PT J AU BLUNDELL, SA SAPIRSTEIN, J JOHNSON, WR AF BLUNDELL, SA SAPIRSTEIN, J JOHNSON, WR TI HIGH-ACCURACY CALCULATION OF PARITY NONCONSERVATION IN CESIUM AND IMPLICATIONS FOR PARTICLE PHYSICS SO PHYSICAL REVIEW D LA English DT Article ID BODY PERTURBATION-THEORY; WEAK NEUTRAL CURRENTS; NUCLEAR ANAPOLE MOMENTS; FREE GAUGE THEORIES; ATOMIC CESIUM; NON-CONSERVATION; MATRIX-ELEMENTS; PRECISION-MEASUREMENT; 6S->7S TRANSITION; 6S-7S TRANSITION AB High-precision measurement of atomic parity-nonconserving transitions in cesium when coupled with calculations of similar accuracy allow for a precise determination of Q(w), the weak nuclear charge. When expressed in terms of the Z mass, radiative corrections to Q(w) are insensitive to the top-quark mass, so such a determination of Q(w) allows a particularly sensitive probe of radiative corrections depending on new physics. While the wave function of cesium, the atom in which the most accurate measurements have been made, is extremely complex, atomic theory has advanced to a point where predictions accurate to 1% can be made. This paper describes such a calculation with particular emphasis on the question of the reliability of the atomic theory. Particle-physics implications following from the present state of theory and experiment are discussed, and prospects for more accurate work described. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. NR 71 TC 190 Z9 190 U1 2 U2 5 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 MAR 1 PY 1992 VL 45 IS 5 BP 1602 EP 1623 DI 10.1103/PhysRevD.45.1602 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HH419 UT WOS:A1992HH41900017 ER PT J AU ALBRIGHT, CH AF ALBRIGHT, CH TI LEPTON MASS AND MIXING MATRICES INVOLVING A 17-KEV DIRAC TAU-NEUTRINO SO PHYSICAL REVIEW D LA English DT Article ID STANDARD SOLAR MODEL; INVARIANT FUNCTIONS; BETA-SPECTRUM; OSCILLATIONS; MATTER; QUARK; DECAY AB We extend our study of neutrino masses and mixings to the case of a 17-keV Dirac-tau-neutrino, which has reappeared in recent beta-decay experiments. A special set of Dirac submatrices is inputted which works well for quarks and yields a top-quark mass near 135 GeV. Unlike our previous Majorana neutrino study, however, we cannot simultaneously explain all the data including the 17-keV neutrino, its small \(V-nu-tau-e)\2 = 0.0085 coupling to the electron, the present accelerator neutrino oscillation bounds, and the preferred solar-neutrino nonadiabatic Mikheyev-Smirnov-Wolfenstein effect interpretation. C1 FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. RP NO ILLINOIS UNIV, DEPT PHYS, DE KALB, IL 60115 USA. OI Albright, Carl/0000-0002-2252-6359 NR 33 TC 3 Z9 3 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD MAR 1 PY 1992 VL 45 IS 5 BP 1624 EP 1627 DI 10.1103/PhysRevD.45.1624 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HH419 UT WOS:A1992HH41900018 ER PT J AU LEBED, RF SUZUKI, M AF LEBED, RF SUZUKI, M TI MAKING ELECTROWEAK MODELS OF COMPOSITE FERMIONS REALISTIC SO PHYSICAL REVIEW D LA English DT Article ID TOP-QUARK MASS; SYMMETRY-BREAKING; HIGGS BOSONS AB We study how the electroweak models of composite fermions with a large compositeness scale can be made realistic, that is, how to incorporate the three generations of massive fermions. The structure of the Higgs sector of these models must satisfy strong constraints, which we discuss in comparison with those of the top-condensate model. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 24 TC 11 Z9 11 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD MAR 1 PY 1992 VL 45 IS 5 BP 1744 EP 1750 DI 10.1103/PhysRevD.45.1744 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HH419 UT WOS:A1992HH41900030 ER PT J AU BLUDMAN, SA KENNEDY, DC LANGACKER, PG AF BLUDMAN, SA KENNEDY, DC LANGACKER, PG TI SEESAW-MODEL PREDICTIONS FOR THE TAU-NEUTRINO MASS SO PHYSICAL REVIEW D LA English DT Note ID MAJORANA NEUTRINOS; OSCILLATION PARAMETERS; HEAVY NEUTRINOS; BETA-DECAY; SOLAR; LIMITS; CONSTRAINTS; MATTER AB The observed deficit of solar neutrinos cannot be explained by a cooler solar model, which would suppress high-energy neutrinos more than low-energy neutrinos, contrary to observation. The small neutrino masses and flavor mixing implied by matter-amplified neutrino oscillations in the Sun are most naturally interpreted in terms of minimal grand unification theories (GUT's) incorporating the seesaw mechanism. In two such theories, SO(10) GUT and supersymmetric GUT, that are consistent with all laboratory experiments, the neutrino mixing is like quark Cabibbo-Kobayashi-Maskawa mixing and the neutrino masses are proportional to the squares of the up-quark masses. For the SO(10) GUT model, the symmetry-breaking scale is intermediate and the mu-neutrino mass is close to that observed in solar-neutrino oscillations. Although the seesaw-model mass predictions are less reliable than the mixing-angle predictions, the tau-neutrino mass may lie in the cosmologically important range 4-28 eV and be accessible to laboratory neutrino oscillation experiments or to observation in a nearby supernova. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,THEORY GRP,BERKELEY,CA 94720. UNIV PENN,PHILADELPHIA,PA 19104. RP BLUDMAN, SA (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 35 TC 62 Z9 62 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAR 1 PY 1992 VL 45 IS 5 BP 1810 EP 1813 DI 10.1103/PhysRevD.45.1810 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HH419 UT WOS:A1992HH41900043 ER PT J AU SULKANEN, ME BOROVSKY, JE AF SULKANEN, ME BOROVSKY, JE TI THE SCALING OF RELATIVISTIC DOUBLE-LAYER WIDTHS - POISSON-VLASOV SOLUTIONS AND PARTICLE-IN-CELL SIMULATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB In this paper the study of relativistic plasma double layers is described through the solution of the one-dimensional, unmagnetized, steady-state Poisson-Vlasov equations and by means of one-dimensional, unmagnetized, particle-in-cell simulations. The thickness versus potential-drop scaling law is extended to relativistic potential drops and relativistic plasma temperatures. The transition in the scaling law for "strong" double layers suggested by analytical two-beam models by Carlqvist [Astrophys. Space Sci. 87, 21 (1982)] is confirmed, and causality problems of standard double-layer simulation techniques applied to relativistic plasma systems are discussed. C1 UNIV CALIF LOS ALAMOS SCI LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545. NR 15 TC 2 Z9 2 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 540 EP 550 DI 10.1063/1.860253 PG 11 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800009 ER PT J AU VAHALA, L VAHALA, G BRETZ, N AF VAHALA, L VAHALA, G BRETZ, N TI ELECTROMAGNETIC-WAVE SCATTERING FROM MAGNETIC FLUCTUATIONS IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MODE CONVERSION; DENSITY-FLUCTUATIONS; THOMSON SCATTERING; PLASMA; TRANSPORT; EDGE; MICROTURBULENCE; PROPAGATION; TURBULENCE; FIELD AB Cross sections are calculated for electromagnetic wave scattering and mode transformation from magnetic and density fluctuations in a homogeneous plasma. For the special case of scattering perpendicular to the magnetic field, density fluctuations scatter ordinary to ordinary and extraordinary to extraordinary modes-but cannot transform these modes. On the other hand, magnetic fluctuations perpendicular to the field can transform modes but cannot scatter on a single branch. For incident frequencies on the order of the electron plasma frequency or gyrofrequency, the cross sections for scattering and transformation due to field and density fluctuations have a similar value. Estimates are given for scattering in a tokamak plasma with special emphasis on the question of how to detect and localize magnetic field fluctuations. Ray tracing calculations, estimates of practical limitations on polarization technique, and lower bound estimates on density and magnetic fluctuation levels show that magnetic fluctuations can be detected and localized by this method. C1 COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. RP VAHALA, L (reprint author), OLD DOMINION UNIV,DEPT ELECT & COMP ENGN,NORFOLK,VA 23529, USA. NR 37 TC 32 Z9 32 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 619 EP 629 DI 10.1063/1.860259 PG 11 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800016 ER PT J AU BATEMAN, G AF BATEMAN, G TI THEORY-BASED TRANSPORT SIMULATIONS OF TFTR L-MODE TEMPERATURE PROFILES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; ABEL-INVERSION METHOD; TOKAMAK TRANSPORT; CODE AB The temperature profiles from a selection of Tokamak Fusion Test Reactor (TFTR) L-mode discharges [17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam, 1990 (EPS, Petit-Lancy, Switzerland, 1990), p. 114] are simulated with the 1 1/2-D BALDUR transport code [Comput. Phys. Commun. 49, 275 (1988)] using a combination of theoretically derived transport models, called the Multi-Mode Model [Comments Plasma Phys. Controlled Fusion 11, 165 (1988)]. The present version of the Multi-Mode Model consists of effective thermal diffusivities resulting from trapped electron modes and ion temperature gradient (eta(i)) modes, which dominate in the core of the plasma, together with resistive ballooning modes, which dominate in the periphery. Within the context of this transport model and the TFTR simulations reported here, the scaling of confinement with heating power comes from the temperature dependence of the eta(i) and trapped electron modes, while the scaling with current comes mostly from resistive ballooning modes. RP BATEMAN, G (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 21 TC 33 Z9 33 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 634 EP 644 DI 10.1063/1.860261 PG 11 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800018 ER PT J AU KAYE, SM LEVINTON, FM HATCHER, R KAITA, R KESSEL, C LEBLANC, B MCCUNE, DC PAUL, S AF KAYE, SM LEVINTON, FM HATCHER, R KAITA, R KESSEL, C LEBLANC, B MCCUNE, DC PAUL, S TI SPITZER OR NEOCLASSICAL RESISTIVITY - A COMPARISON BETWEEN MEASURED AND MODEL POLOIDAL FIELD PROFILES ON PBX-M SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAK; PDX; PENETRATION; DISCHARGES; TRANSPORT; TFTR AB Direct measurements of the radial profile of the magnetic field line pitch on PBX-M [Phys. Fluids B 2, 1271 (1990)], coupled with model predictions of these profiles allow a critical comparison with the Spitzer and neoclassical models of plasma parallel resistivity. The measurements of the magnetic field line pitch are made by motional Stark effect polarimetry, while the model profiles are determined by solving the poloidal field diffusion equation in the TRANSP transport code using measured plasma profiles and assuming either Spitzer or neoclassical resistivity. The measured field pitch profiles were available for only seven cases, and the model profiles were distinguishable from each other in only three of those cases due to finite resistive diffusion times. The data in two of these three were best matched by the Spitzer model, especially in the inner-half of the plasma. Portions of the measured pitch profiles for these two cases and the full profiles for other cases, however, departed significantly from both the Spitzer and neoclassical models, indicating a plasma resistivity profile different from either model. RP KAYE, SM (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 29 TC 10 Z9 10 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 651 EP 658 DI 10.1063/1.860263 PG 8 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800020 ER PT J AU DEGROOT, JS ESTABROOK, KG KRUER, WL DRAKE, RP MIZUNO, K CAMERON, SM AF DEGROOT, JS ESTABROOK, KG KRUER, WL DRAKE, RP MIZUNO, K CAMERON, SM TI DISTRIBUTED ABSORPTION-MODEL FOR MODERATE TO HIGH LASER POWERS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB An analytic model is presented of a planar plasma heated by moderate to high laser powers such as are used to drive fusion pellets. Unlike previous models, this model explicitly includes the temporal evolution of the heat conduction region. It is shown that previous steady-state models apply only to a narrow range of the parameters (laser energy flux and pulse width) used in laser pellet fusion. The new model is shown to agree with flux-limited hydrodynamics simulations. The model and hydrodynamic simulations for classical heat transport show that the mass ablation rate and ablation pressure are essentially independent of laser wavelength for parameters relevant to laser fusion. C1 UNIV CALIF DAVIS,PLASMA RES GRP,DAVIS,CA 95616. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,Y PROGRAM,LIVERMORE,CA 94550. UNIV CALIF DAVIS,PLASMA PHYS RES INST,DAVIS,CA 95616. RP DEGROOT, JS (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616, USA. RI Drake, R Paul/I-9218-2012 OI Drake, R Paul/0000-0002-5450-9844 NR 12 TC 29 Z9 29 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 701 EP 707 DI 10.1063/1.860268 PG 7 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800025 ER PT J AU WHITTUM, DH AF WHITTUM, DH TI ELECTROMAGNETIC-INSTABILITY OF THE ION-FOCUSED REGIME SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID FREE-ELECTRON LASER; SMALL-SIGNAL MODES; MICROWAVE EMISSION; BEAM PROPAGATION; CHANNEL LASER AB A relativistic electron beam propagating through a wide plasma channel in the ion-focused regime exhibits an electromagnetic instability coupled to the "betatron" motion, with peak growth rate near a resonant angular frequency-omega approximately 2-gamma-2-omega(beta), where gamma is the Lorentz factor for the beam, and omega(beta) is the angular frequency of transverse oscillations. An eikonal formalism is derived analogous to that for the free-electron laser and the dispersion relation is determined. Constraints due to energy spread and other sources of detuning are noted. Analytic scaling laws are compared to the results of numerical simulation for a practical example corresponding to a microwave amplifier. Constraints due to competing instabilities are noted and the extension to short wavelengths is discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 29 TC 46 Z9 48 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 730 EP 739 DI 10.1063/1.860271 PG 10 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800028 ER PT J AU PETERSON, G DEMOS, PT TURCHINETZ, WE WILSON, PB PANOFSKY, WKH AF PETERSON, G DEMOS, PT TURCHINETZ, WE WILSON, PB PANOFSKY, WKH TI BARBER,W,CARLISLE - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual C1 MIT,CAMBRIDGE,MA 02139. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP PETERSON, G (reprint author), UNIV MASSACHUSETTS,AMHERST,MA 01003, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD MAR PY 1992 VL 45 IS 3 BP 80 EP 81 DI 10.1063/1.2809590 PG 2 WC Physics, Multidisciplinary SC Physics GA HH827 UT WOS:A1992HH82700012 ER PT J AU BENFORD, J LOFGREN, E LASLETT, LJ FALTENS, A AF BENFORD, J LOFGREN, E LASLETT, LJ FALTENS, A TI SLOAN,DAVID - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BENFORD, J (reprint author), PHYS INT CO,SAN LEANDRO,CA 94577, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD MAR PY 1992 VL 45 IS 3 BP 82 EP 82 DI 10.1063/1.2809593 PG 1 WC Physics, Multidisciplinary SC Physics GA HH827 UT WOS:A1992HH82700015 ER PT J AU DRELL, SD AF DRELL, SD TI UNDERGROUND NUCLEAR TESTING, CONTINUED - REPLY SO PHYSICS TODAY LA English DT Letter RP DRELL, SD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD MAR PY 1992 VL 45 IS 3 BP 96 EP 96 PG 1 WC Physics, Multidisciplinary SC Physics GA HH827 UT WOS:A1992HH82700021 ER PT J AU WOLPERT, D AF WOLPERT, D TI REVERSIBLE COMPUTING AND PHYSICAL LAW SO PHYSICS TODAY LA English DT Letter RP WOLPERT, D (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 1 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD MAR PY 1992 VL 45 IS 3 BP 98 EP 99 DI 10.1063/1.2809599 PG 2 WC Physics, Multidisciplinary SC Physics GA HH827 UT WOS:A1992HH82700023 ER PT J AU NOYES, HP AF NOYES, HP TI REVERSIBLE COMPUTING AND PHYSICAL LAW SO PHYSICS TODAY LA English DT Letter RP NOYES, HP (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD MAR PY 1992 VL 45 IS 3 BP 99 EP 100 PG 2 WC Physics, Multidisciplinary SC Physics GA HH827 UT WOS:A1992HH82700024 ER PT J AU WILKS, S AF WILKS, S TI ION-RIPPLE LASERS PROMISE CHEAP, EFFICIENT RADIATION SO PHYSICS WORLD LA English DT Article RP WILKS, S (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8585 J9 PHYS WORLD JI Phys. World PD MAR PY 1992 VL 5 IS 3 BP 26 EP 27 PG 2 WC Physics, Multidisciplinary SC Physics GA HH248 UT WOS:A1992HH24800020 ER PT J AU ANDERSON, RW NEFF, WA AF ANDERSON, RW NEFF, WA TI ELECTROLESS NICKEL BATH RECOVERY BY CATION-EXCHANGE AND PRECIPITATION SO PLATING AND SURFACE FINISHING LA English DT Article AB An energy-efficient process* for the rejuvenation and recycling of chemicals used in electroless nickel plating has been developed. The process eliminates the discharge of hazardous wastes normally associated with electroless plating, and it will improve plating quality and speed while significantly reducing costs. Undesirable by-products are removed from the plating process in forms that are environmentally safe so that they can be used as fertilizers or disposed of in sanitary landfills. In addition, the process recovers the nickel and other valuable chemicals from the plating solution and recycles them. It is estimated that hazardous wastes currently generated from the electroless nickel plating industry is more than 20,000 tons/year in the U.S. alone. This new process is claimed to have the capability of reducing the total amount of waste to less than 10 percent of the current tonnage. RP ANDERSON, RW (reprint author), MARTIN MARIETTA ENERGY SYST INC,DIV TECH,OAK RIDGE K-25 SITE,POB 2003,OAK RIDGE,TN 37831, USA. NR 3 TC 4 Z9 7 U1 0 U2 3 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD MAR PY 1992 VL 79 IS 3 BP 18 EP & PG 0 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA HH619 UT WOS:A1992HH61900001 ER PT J AU RAGHAVAN, D TORMA, AE AF RAGHAVAN, D TORMA, AE TI DSC AND FTIR CHARACTERIZATION OF BIODEGRADATION OF POLYETHYLENE SO POLYMER ENGINEERING AND SCIENCE LA English DT Article AB Aspergillus niger, a fungus, was used in the degradation of commercially available thermoplastic polyethylene films. Quantitative calorimetric measurements performed on as-received, abiotic, and biotic treated polyethylene samples, revealed that the amorphocity of the sample decreases during biodegradation. In addition, it was found that the external substrates (sucrose) in the growth medium influenced the biodegradation process of polyethylene. Furthermore, the crystallinity data on different biotreated samples indicated that the adapted microorganisms were able to metabolize a small portion of polyethylene. The significance of the Fourier transform infrared (FTIR) results of polyethylene samples have been discussed. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,BIOTECHNOL,IDAHO FALLS,ID 83415. RP RAGHAVAN, D (reprint author), UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801, USA. NR 24 TC 19 Z9 19 U1 0 U2 5 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0032-3888 J9 POLYM ENG SCI JI Polym. Eng. Sci. PD MAR PY 1992 VL 32 IS 6 BP 438 EP 442 DI 10.1002/pen.760320609 PG 5 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA HK939 UT WOS:A1992HK93900008 ER PT J AU HALOW, JS NICOLETTI, P AF HALOW, JS NICOLETTI, P TI OBSERVATIONS OF FLUIDIZED-BED COALESCENCE USING CAPACITANCE IMAGING SO POWDER TECHNOLOGY LA English DT Article AB A unique method for imaging voidage within a fluidized bed has been developed at the Morgantown Energy Technology Center (METC). This system allows high speed three-dimensional imaging of the voidage distribution in a bed to be recorded. From this imaging data a wide variety of visualizations can be created and various kinds of quantitative information extracted. Three materials with differing particle sizes were fluidized over a range of superficial velocities in a 15.24 cm diameter bed. The bed was imaged in a zone 1.25 to 2 bed diameters above the grid. This is a region which shows appreciable bubble growth and a transition of the flow regime from bubbling to slugging. The imaging allowed bubble sizes and rise velocities to be measured, revealed detailed voidage distributions, provided images of several forms of coalescence, and provided measurements of the expansion of the emulsion phase under some conditions. The imaging data point out several shortcomings of the two-phase representation of fluidized beds and the need for alternate models which better represent the voidage structure, at least in the grid-influenced region of fluidized beds. The technique has the potential to substantially improve design and scale-up of fluidized beds and other gas-solid systems by providing a detailed understanding of the gas-solids dynamics. C1 EG&G,WASHINGTON ANALYT SERV CTR,MORGANTOWN,WV. RP HALOW, JS (reprint author), US DOE,MORGANTOWN,WV 26505, USA. NR 9 TC 61 Z9 61 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD MAR PY 1992 VL 69 IS 3 BP 255 EP 277 DI 10.1016/0032-5910(92)80017-Q PG 23 WC Engineering, Chemical SC Engineering GA HK304 UT WOS:A1992HK30400007 ER PT J AU LYCZKOWSKI, RW WANG, CS AF LYCZKOWSKI, RW WANG, CS TI HYDRODYNAMIC MODELING AND ANALYSIS OF 2-PHASE NON-NEWTONIAN COAL WATER SLURRIES SO POWDER TECHNOLOGY LA English DT Article ID FLUIDIZED-BED AB The two-phase hydrodynamic theory of fluid/solids flow has been utilized to extend the non-Newtonian power-law model to describe the solids rheology for nonhomogeneous slurry flow. The model developed predicts the two-dimensional spatial and temporal variations of solids and liquid velocities and concentration for non-Newtonian power-law slurries experiencing high shear rates typically found in diesel engine injection systems. Comparisons with analytical solutions and literature data for single-phase Newtonian and non-Newtonian flows are presented. The model has been validated using Newtonian single-phase (pure water and No. 2 diesel fuel) and non-Newtonian two-phase (coal/water slurry) capillary tube viscometer shear rate, viscosity, mass flow rate and pressure drop data. Results applicable for typical diesel engine injection systems are presented. The results from this model can be used to calculate the erosion rates at the injection nozzle boundaries and the solids loading at its exit. C1 AT&T BELL LABS,NAPERVILLE,IL 60556. RP LYCZKOWSKI, RW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 22 TC 9 Z9 9 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD MAR PY 1992 VL 69 IS 3 BP 285 EP 294 DI 10.1016/0032-5910(92)80019-S PG 10 WC Engineering, Chemical SC Engineering GA HK304 UT WOS:A1992HK30400009 ER PT J AU KAPTEYN, HC DASILVA, LB FALCONE, RW AF KAPTEYN, HC DASILVA, LB FALCONE, RW TI SHORT-WAVELENGTH LASERS SO PROCEEDINGS OF THE IEEE LA English DT Article ID X-RAY AMPLIFICATION; CONFINED PLASMA-COLUMN; STIMULATED EMISSION; MOLECULAR-HYDROGEN; CARBON-FIBER; GAIN; IONS; BANDS; XENON; NM AB In this paper, we review the development of short-wavelength lasers. Three pumping mechanisms have been demonstrated which produce lasing at wavelengths from 3 to 100 nm. These mechanisms include electron-collisional excitation, electron-ion recombination, and photo-excitation. Examples of X-ray lasers and future directions of the field are discussed. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP WASHINGTON STATE UNIV, DEPT PHYS, PULLMAN, WA 99164 USA. RI Kapteyn, Henry/H-6559-2011 OI Kapteyn, Henry/0000-0001-8386-6317 NR 55 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9219 EI 1558-2256 J9 P IEEE JI Proc. IEEE PD MAR PY 1992 VL 80 IS 3 BP 342 EP 347 DI 10.1109/5.135351 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA HN943 UT WOS:A1992HN94300002 ER PT J AU SANO, T GLAZER, AN CANTOR, CR AF SANO, T GLAZER, AN CANTOR, CR TI A STREPTAVIDIN METALLOTHIONEIN CHIMERA THAT ALLOWS SPECIFIC LABELING OF BIOLOGICAL-MATERIALS WITH MANY DIFFERENT HEAVY-METAL IONS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE FUSION PROTEIN; BIOTIN-BINDING PROTEIN; METAL-BINDING PROTEIN; GENETIC ENGINEERING ID EMISSION-SPECTROMETRY; EXPRESSION; CLUSTERS; BINDING; AVIDIN; GENE; RNA AB We have designed a streptavidin-metallothionein chimeric protein in which the streptavidin moiety provides a means of binding the metallothionein moiety tightly to specific biological targets. A gene fusion of streptavidin with mouse metallothionein I was efficiently expressed in Escherichia coli, and the expressed chimeric protein was purified to homogeneity by a simple procedure. The purified chimera, consisting of four identical subunits, bound one biotin and approximately seven Cd2+ ions per subunit (19.5 kDa). This indicates that both the streptavidin and the metallothionein moieties are fully functional. The high binding affinity of the chimera both for biotin and for heavy metal ions allows the specific labeling or conjugation of any biological material containing unhindered biotin with a variety of different heavy metal ions and their isotopes, thereby, opening the way for simultaneous assay systems for a large number of biological targets. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. RP SANO, T (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA39782] NR 40 TC 42 Z9 43 U1 0 U2 1 PU NATL ACAD PRESS 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 MAR 1 PY 1992 VL 89 IS 5 BP 1534 EP 1538 DI 10.1073/pnas.89.5.1534 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HG681 UT WOS:A1992HG68100004 PM 1542645 ER PT J AU GRADY, DL RATLIFF, RL ROBINSON, DL MCCANLIES, EC MEYNE, J MOYZIS, RK AF GRADY, DL RATLIFF, RL ROBINSON, DL MCCANLIES, EC MEYNE, J MOYZIS, RK TI HIGHLY CONSERVED REPETITIVE DNA-SEQUENCES ARE PRESENT AT HUMAN CENTROMERES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID HUMAN SATELLITE DNAS; HUMAN-CHROMOSOMES; TELOMERIC DNA; (TTAGGG)N; ORGANIZATION; SITES AB Highly conserved repetitive DNA sequence clones, largely consisting of (GGAAT)n repeats, have been isolated from a human recombinant repetitive DNA library by high-stringency hybridization with rodent repetitive DNA. This sequence, the predominant repetitive sequence in human satellites Il and III, is similar to the essential core DNA of the Saccharomyces cerevisiae centromere, centromere DNA element (CDE) III. In situ hybridization to human telophase and Drosophila polytene chromosomes shows localization of the (GGAAT)n sequence to centromeric regions. Hyperchromicity studies indicate that the (GGAAT)n sequence exhibits unusual hydrogen bonding properties. The purine-rich strand alone has the same thermal stability as the duplex. Hyperchromicity studies of synthetic DNA variants indicate that all sequences with the composition (AATGN)n exhibit this unusual thermal stability. DNA-mobility-shift assays indicate that specific HeLa-cell nuclear proteins recognize this sequence with a relative affinity > 10(5). The extreme evolutionary conservation of this DNA sequence, its centromeric location, its unusual hydrogen bonding properties, its high affinity for specific nuclear proteins, and its similarity to functional centromeres isolated from yeast suggest that this sequence may be a component of the functional human centromere. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. NR 29 TC 165 Z9 166 U1 0 U2 3 PU NATL ACAD PRESS 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 MAR 1 PY 1992 VL 89 IS 5 BP 1695 EP 1699 DI 10.1073/pnas.89.5.1695 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HG681 UT WOS:A1992HG68100037 PM 1542662 ER PT J AU COSMAN, M DELOSSANTOS, C FIALA, R HINGERTY, BE SINGH, SB IBANEZ, V MARGULIS, LA LIVE, D GEACINTOV, NE BROYDE, S PATEL, DJ AF COSMAN, M DELOSSANTOS, C FIALA, R HINGERTY, BE SINGH, SB IBANEZ, V MARGULIS, LA LIVE, D GEACINTOV, NE BROYDE, S PATEL, DJ TI SOLUTION CONFORMATION OF THE MAJOR ADDUCT BETWEEN THE CARCINOGEN (+)-ANTI-BENZO[A]PYRENE DIOL EPOXIDE AND DNA SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; NUCLEAR MAGNETIC-RESONANCE; ANTHRAMYCIN-D(ATGCAT)2 ADDUCT; CLOWES,G.H.A. MEMORIAL; OPTICAL ENANTIOMERS; MOLECULAR MECHANICS; HUMAN CANCER; BINDING; NMR; 7,8-DIOL-9,10-EPOXIDES AB We have synthesized, separated, and purified almost-equal-to 10 mg of a deoxyundecanucleotide duplex containing a single centrally positioned covalent adduct between (+)-anti-benzo[a]pyrene (BP) diol epoxide and the exocyclic amino group of guanosine. Excellent proton NMR spectra are observed for the (+)-trans-anti-BP diol epoxide-N2-dG adduct positioned opposite dC and flanked by G.C pairs in the d[C1-C2-A3-T4-C5-(BP)G6-C7-T8-A9-C1O-C11].d[G12-G13-T14-A15-G16-C17-G18-A19-T20-G21-G22] duplex [designated (BP)G.C 11-mer]. We have determined the solution structure centered about the BP covalent adduct site in the (BP)G.C 11-mer duplex by incorporating intramolecular and intermolecular proton-proton distance bounds deduced from the NMR data sets as constraints in energy minimization computations. The BP ring is positioned in the minor groove and directed toward the 5' end of the modified strand. One face of the BP ring of (BP)G6 is stacked over the G18 and A19 sugar-phosphate backbone on the partner strand and the other face is exposed to solvent. A minimally perturbed B-DNA helix is observed for the d[T4-C5-(BP)G6-C7-T8].d[A15-G16-C17-G18-A19] segment centered about the adduct site with Watson-Crick alignment for both the (BP)G6.C17 pair and flanking G.C pairs. A widening of the minor groove at the adduct site is detected that accommodates the BP ring whose long axis makes an angle of almost-equal-to 45-degrees with the average direction of the DNA helix axis. Our study holds future promise for the characterization of other stereoisomerically pure adducts of BP diol epoxides with DNA to elucidate the molecular basis of structure-activity relationships associated with the stereoisomer-dependent spectrum of mutational and carcinogenic activities. C1 COLUMBIA UNIV COLL PHYS & SURG,DEPT BIOCHEM & MOLEC BIOPHYS,NEW YORK,NY 10032. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. NYU,DEPT CHEM,NEW YORK,NY 10003. NYU,DEPT BIOL,NEW YORK,NY 10003. CALTECH,DEPT CHEM,PASADENA,CA 91125. RI Fiala, Radovan/D-8789-2012 FU NCI NIH HHS [CA-20851, CA-28038]; NIDDK NIH HHS [DK-38676] NR 47 TC 274 Z9 275 U1 2 U2 7 PU NATL ACAD PRESS 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 MAR 1 PY 1992 VL 89 IS 5 BP 1914 EP 1918 DI 10.1073/pnas.89.5.1914 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HG681 UT WOS:A1992HG68100082 PM 1311854 ER PT J AU KOSSIAKOFF, AA SINTCHAK, MD SHPUNGIN, J PRESTA, LG AF KOSSIAKOFF, AA SINTCHAK, MD SHPUNGIN, J PRESTA, LG TI ANALYSIS OF SOLVENT STRUCTURE IN PROTEINS USING NEUTRON D2O-H2O SOLVENT MAPS - PATTERN OF PRIMARY AND SECONDARY HYDRATION OF TRYPSIN SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE NEUTRON D2O-H2O SOLVENT DIFFERENCE MAPS; NEUTRON DIFFRACTION; TRYPSIN WATER STRUCTURE; DENSITY MODIFICATION ID DENSITY MODIFICATION; RESOLUTION; REFINEMENT; CRYSTALLOGRAPHY; CRYSTALS; LYSOZYME; WATER AB A method of determining the water structure in protein crystals is described using neutron solvent difference maps. These maps are obtained by comparing the changes in diffracted intensities between two data sets, one in which H2O is the major solvent constituent, and a second in which D2O is the solvent medium. To a good first approximation, the protein atom contributions to the scattering intensities in both data sets are equal and cancel, but since H2O and D2O have very different neutron-scattering properties, their differences are accentuated to reveal an accurate representation of the solvent structure. The method also employs a series of density modification steps that impose known physical constraints on the density distribution function in the unit cell by making real space modifications directly to the density maps. Important attributes of the method are that (1) it is less subjective in the assignment of water positions than X-ray analysis; (2) there is threefold improvement in the signal-to-noise ratio for the solvent density; and (3) the iterative density modification produces a low-biased representation of the solvent density. Tests showed that water molecules with as low as 10% occupancy could be confidently assigned. About 300 water sites were assigned for trypsin from the refined solvent density; 140 of these sites were defined in the maps as discrete peaks, while the remaining were found within less-ordered channels of density. There is a very good correspondence between the sites in the primary hydration layer and waters found in the X-ray structure. Most water sites are clustered into H-bonding networks, many of which are found along intermolecular contact zones. The bound water is equally distributed between contacting apolar and polar atoms at the protein interface. A common occurrence at hydrophobic surfaces is that apolar atoms are circumvented by one or more waters that are part of a larger water network. When the effects on surface accessibility by neighboring molecules in the crystal lattice are taken into consideration, only about 29% of the surface does not interface ordered water. About 25% of the ordered water is found in the second hydration sphere. In many instances these waters bridge larger clusters of primary layer waters. It is apparent that, in certain regions of the crystal, the organization of ordered water reflects the characteristics of the crystal environment more than those of trypsin's surface alone. C1 UNIV CALIF SAN FRANCISCO,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP KOSSIAKOFF, AA (reprint author), GENENTECH INC,DEPT PROT ENGN,460 POINT SAN BRUNO,SAN FRANCISCO,CA 94080, USA. FU NIGMS NIH HHS [GM 33571] NR 25 TC 65 Z9 67 U1 0 U2 5 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-3585 J9 PROTEINS JI Proteins PD MAR PY 1992 VL 12 IS 3 BP 223 EP 236 DI 10.1002/prot.340120303 PG 14 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HF799 UT WOS:A1992HF79900002 PM 1557350 ER PT J AU BASS, MB HOPKINS, DF JAQUYSH, WAN ORNSTEIN, RL AF BASS, MB HOPKINS, DF JAQUYSH, WAN ORNSTEIN, RL TI A METHOD FOR DETERMINING THE POSITIONS OF POLAR HYDROGENS ADDED TO A PROTEIN-STRUCTURE THAT MAXIMIZES PROTEIN HYDROGEN-BONDING SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE COMPUTER PROGRAM; HYDROGEN BONDS; MOLECULAR DYNAMICS; COMPUTER MODELING ID MOLECULAR-DYNAMICS SIMULATIONS; PANCREATIC TRYPSIN-INHIBITOR; NUCLEIC-ACIDS; FLUCTUATIONS; NEUTRON; MODELS AB An automated method for the optimal placement of polar hydrogens in a protein structure is described. This method treats the polar, side chain hydrogens of lysine, serine, threonine, and tyrosine and the amino terminus of a protein. The program, called NETWORK, divides the potential hydrogen-bonding pairs of a protein into groups of interacting donors and acceptors. A search is conducted on each of the local groups to find an arrangement which forms the most hydrogen bonds. If two or more arrangements have the same number of hydrogen bonds, the arrangement with the shortest set of hydrogen bonds is selected. The polar hydrogens of the histidyl side chain are specifically treated, and the ionization state of this residue is allowed to change, if this change results in additional hydrogen bonds for the local group. The program will accept Protein Data Bank as well as Biosym-format coordinate files. Input and output routines can be easily modified to accept other coordinate file formats. The predictions from this method are compared to known hydrogen positions for bovine pancreatic trypsin inhibitor, insulin, RNase-A, and trypsin for which the neutron diffraction structures have been determined. The usefulness of this program is further demonstrated by a comparison of molecular dynamics simulations for the enzyme cytochrome P-450cam with and without using NETWORK. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. PACIFIC NW LAB, ENVIRONM SCI RES CTR, RICHLAND, WA 99352 USA. NR 21 TC 32 Z9 32 U1 1 U2 19 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-3585 J9 PROTEINS JI Proteins PD MAR PY 1992 VL 12 IS 3 BP 266 EP 277 DI 10.1002/prot.340120305 PG 12 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HF799 UT WOS:A1992HF79900004 PM 1372979 ER PT J AU DENG, K KWONG, MK LEVINE, HA AF DENG, K KWONG, MK LEVINE, HA TI THE INFLUENCE OF NONLOCAL NONLINEARITIES ON THE LONG-TIME BEHAVIOR OF SOLUTIONS OF BURGERS-EQUATION SO QUARTERLY OF APPLIED MATHEMATICS LA English DT Article ID REACTION-DIFFUSION EQUATION AB We study the long time behavior of solutions of Burgers's equation with nonlocal nonlinearities: u(t) = u(xx) + epsilon-uu(x) + 1/2 (a parallel-to u(., t)parallel-to p-1 + b)u, 0 < x < 1, a, epsilon is-an-element-of R, b > 0, p > 1, subject to u(0, t) = u(1, t) = 0. A stability-instability analysis is given in some detail, and some finite time blow up results are given. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP DENG, K (reprint author), UNIV SW LOUISIANA,LAFAYETTE,LA 70504, USA. NR 14 TC 38 Z9 42 U1 0 U2 2 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0033-569X J9 Q APPL MATH JI Q. Appl. Math. PD MAR PY 1992 VL 50 IS 1 BP 173 EP 200 PG 28 WC Mathematics, Applied SC Mathematics GA HD072 UT WOS:A1992HD07200013 ER PT J AU YOSHIDA, H TURNER, JE BOLCH, WE JACOBSON, KB GARRISON, WM AF YOSHIDA, H TURNER, JE BOLCH, WE JACOBSON, KB GARRISON, WM TI MEASUREMENT OF PRODUCTS FROM X-IRRADIATED GLYCYLGLYCINE IN OXYGEN-FREE AQUEOUS-SOLUTIONS SO RADIATION RESEARCH LA English DT Article ID PULSE RADIOLYSIS; 3 NS; ELECTRON; WATER; CHROMATOGRAPHY; YIELDS; ACIDS; DECAY; PS C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. TEXAS A&M UNIV SYST,DEPT NUCL ENGN,COLLEGE STN,TX 77843. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP YOSHIDA, H (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 31 TC 4 Z9 4 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD MAR PY 1992 VL 129 IS 3 BP 258 EP 264 DI 10.2307/3578024 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HH763 UT WOS:A1992HH76300003 PM 1542714 ER PT J AU CHANG, PY TOBIAS, CA BLAKELY, EA AF CHANG, PY TOBIAS, CA BLAKELY, EA TI PROTEIN-SYNTHESIS MODULATES THE BIOLOGICAL EFFECTIVENESS OF THE COMBINED ACTION OF HYPERTHERMIA AND HIGH-LET RADIATION SO RADIATION RESEARCH LA English DT Article ID HAMSTER OVARY CELLS; CHARGED-PARTICLE RADIOTHERAPY; DNA-SYNTHESIS; CELLULAR DNA; HEAT-SHOCK; CHO CELLS; CYCLOHEXIMIDE; INVOLVEMENT; NUCLEAR; THERMOTOLERANCE RP CHANG, PY (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 34 TC 10 Z9 10 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD MAR PY 1992 VL 129 IS 3 BP 272 EP 280 DI 10.2307/3578026 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HH763 UT WOS:A1992HH76300005 PM 1542716 ER PT J AU CODERRE, JA JOEL, DD MICCA, PL NAWROCKY, MM SLATKIN, DN AF CODERRE, JA JOEL, DD MICCA, PL NAWROCKY, MM SLATKIN, DN TI CONTROL OF INTRACEREBRAL GLIOSARCOMAS IN RATS BY BORON NEUTRON-CAPTURE THERAPY WITH PARA-BORONOPHENYLALANINE SO RADIATION RESEARCH LA English DT Article ID CENTRAL-NERVOUS-SYSTEM; RELATIVE BIOLOGICAL EFFECTIVENESS; B-10(N,ALPHA)LI-7 REACTION; BRAIN TUMORS; MELANOMA; CELLS; PRECURSOR; DAMAGE; BEAM; MICE RP CODERRE, JA (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. FU NCI NIH HHS [CA42446] NR 35 TC 73 Z9 75 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD MAR PY 1992 VL 129 IS 3 BP 290 EP 296 DI 10.2307/3578028 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HH763 UT WOS:A1992HH76300007 PM 1542717 ER PT J AU HALLAHAN, DE VIRUDACHALAM, S SCHWARTZ, JL PANJE, N MUSTAFI, R WEICHSELBAUM, RR AF HALLAHAN, DE VIRUDACHALAM, S SCHWARTZ, JL PANJE, N MUSTAFI, R WEICHSELBAUM, RR TI INHIBITION OF PROTEIN-KINASES SENSITIZES HUMAN TUMOR-CELLS TO IONIZING-RADIATION SO RADIATION RESEARCH LA English DT Article ID NECROSIS-FACTOR; PHORBOL ESTER; EXPRESSION; INDUCTION; RADIORESISTANT; INVOLVEMENT; ACTIVATION; CARCINOMA; PRODUCTS; INCREASE C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. RP HALLAHAN, DE (reprint author), UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637, USA. FU NCI NIH HHS [CA 37435, CA 42596] NR 30 TC 78 Z9 78 U1 1 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD MAR PY 1992 VL 129 IS 3 BP 345 EP 350 DI 10.2307/3578035 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HH763 UT WOS:A1992HH76300014 PM 1542722 ER PT J AU ARGO, P FITZGERALD, TJ CARLOS, R AF ARGO, P FITZGERALD, TJ CARLOS, R TI NICARE I HF PROPAGATION EXPERIMENT RESULTS AND INTERPRETATION SO RADIO SCIENCE LA English DT Article ID PLASMA AB The NICARE I chemical release created a large electron density depletion in the nighttime F region of the ionosphere at an altitude of approximately 300 km which persisted for at least 30 min. A three-dimensional ray-tracing code (TRACKER) predicted that the lenslike refractive perturbation would create new off-axis modes in long-distance HF radio paths which reflected in the ionosphere near the depletion. Channel measurements during this experiment bear this out. The multipath created by these new modes induced an increased fading rate on the received signals. Analysis of the time history of the direction of arrival of the new modes indicates that after the initial expansion of the release the western edge continued to move westward while the eastward edge remained stable in location. This behavior is consistent with model predictions of the behavior of the depletion. RP ARGO, P (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 5 Z9 5 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD MAR-APR PY 1992 VL 27 IS 2 BP 289 EP 305 DI 10.1029/91RS02916 PG 17 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA HM401 UT WOS:A1992HM40100020 ER PT J AU LOO, RRO LOO, JA UDSETH, HR FULTON, JL SMITH, RD AF LOO, RRO LOO, JA UDSETH, HR FULTON, JL SMITH, RD TI PROTEIN STRUCTURAL EFFECTS IN GAS-PHASE ION MOLECULE REACTIONS WITH DIETHYLAMINE SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID IONIZATION-MASS-SPECTROMETRY; ELECTROSPRAY-IONIZATION; ELECTROPHORESIS; DENATURATION; PEPTIDE AB The relationship between gas-phase protein structure and ion/molecule reactivity is explored in comparisons between native and disulfide-reduced aprotinin, lysozyme, and albumin. Reactions are performed in the atmospheric-pressure inlet to a quadrupole mass spectrometer employing a novel capillary interface-reactor. In reactions with equal concentrations of diethylamine, multiply protonated molecules generated by electrospray ionization (ESI) of 'native' proteins shifted to lower charge states than did multiply protonated molecules from ESI of the disulfide-reduced counterparts, suggesting that the disulfide-reduced protein ions are less reactive than native protein ions of the same charge state. Differences in reactivity may arise from protonation of different amino acid residues and/or differences in the proximities of charge sites in the two molecules. These results suggest that the reactivity of multiply charged proteins can be significantly affected by their gas-phase structure. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 38 TC 62 Z9 62 U1 0 U2 6 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0951-4198 J9 RAPID COMMUN MASS SP JI Rapid Commun. Mass Spectrom. PD MAR PY 1992 VL 6 IS 3 BP 159 EP 165 DI 10.1002/rcm.1290060302 PG 7 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA HH681 UT WOS:A1992HH68100001 PM 1372835 ER PT J AU JOHNSON, PD BROOKES, NB HULBERT, SL KLAFFKY, R CLARKE, A SINKOVIC, B SMITH, NV CELOTTA, R KELLY, MH PIERCE, DT SCHEINFEIN, MR WACLAWSKI, BJ HOWELLS, MR AF JOHNSON, PD BROOKES, NB HULBERT, SL KLAFFKY, R CLARKE, A SINKOVIC, B SMITH, NV CELOTTA, R KELLY, MH PIERCE, DT SCHEINFEIN, MR WACLAWSKI, BJ HOWELLS, MR TI SPIN-POLARIZED PHOTOEMISSION SPECTROSCOPY OF MAGNETIC-SURFACES USING UNDULATOR RADIATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; SYNCHROTRON RADIATION; ANALYZER; DIFFRACTION; FE(001) AB A beamline has been established at the National Synchrotron Light Source to perform angle-resolved photoemission experiments on magnetic surfaces with spin sensitivity. The system has two novel features: it uses a miniature electron-spin polarization analyzer and it also uses synchrotron radiation from an undulator rather than a bending magnet. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. AT&T BELL LABS,MURRAY HILL,NJ 07974. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP JOHNSON, PD (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 25 TC 53 Z9 53 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1992 VL 63 IS 3 BP 1902 EP 1908 DI 10.1063/1.1143301 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HG449 UT WOS:A1992HG44900007 ER PT J AU LEWIS, KP MORAN, MJ HALL, J AF LEWIS, KP MORAN, MJ HALL, J TI A HIGH-EFFICIENCY FOCUSING CHERENKOV RADIATION DETECTOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A new design uses advanced technology to produce an efficient, high-bandwidth Cherenkov detector for relativistic charged particles. The detector consists of a diamond-lathe machined ultraviolet-grade Lucite radiator, a parabolic focusing mirror, and a photodiode with an S-20 cathode. This article discusses some details of the detector design and describes preliminary measurements of its response characteristics. The data show the detector to have an overall gain of almost-equal-to 76 signal electrons per incident electron and a photodiode-limited response time of almost-equal-to 450 ps. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,L-41,LIVERMORE,CA 94550. EG&G ENERGY MEASUREMENTS INC,POB 8051,PLEASANTON,CA 94588. NR 6 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1992 VL 63 IS 3 BP 1988 EP 1990 DI 10.1063/1.1143316 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HG449 UT WOS:A1992HG44900022 ER PT J AU IGLESIAS, CA ROGERS, FJ WILSON, BG AF IGLESIAS, CA ROGERS, FJ WILSON, BG TI CALCULATION OF DETAILED ATOMIC DATA USING PARAMETRIC POTENTIALS SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article; Proceedings Paper CT WORKSHOP ON ASTROPHYSICAL OPACITIES CY JUL 15-19, 1991 CL IBM VENEZUELA SCI CTR, CARACAS, VENEZUELA SP IBM VENEZUELA, FDN POLAR, VENEZUELAN CONICIT HO IBM VENEZUELA SCI CTR DE ATOMIC PROCESSES; PLASMAS; TRANSITION PROBABILITIES ID OSCILLATOR-STRENGTHS; OPACITY CALCULATIONS AB Parametric potentials consisting of a sum of Yukawa terms plus a long-ranged Coulomb tail can provide atomic data of accuracy comparable to single-configuration, self-consistent field calculations with relativistic corrections. The method is used to generate prefitted effective potentials for isoelectronic sequences up to zinc, not only for valence electrons but also for multiply excited configurations as well as inner-core excitations. Comparisons to experimental and other theoretical calculations are presented. RP IGLESIAS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 17 TC 5 Z9 5 U1 0 U2 0 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTR JI Rev. Mex. Astron. Astrofis. PD MAR PY 1992 VL 23 SI SI BP 9 EP 18 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV967 UT WOS:A1992HV96700002 ER PT J AU ROGERS, FJ IGLESIAS, CA AF ROGERS, FJ IGLESIAS, CA TI EQUATION OF STATE OF PARTIALLY-IONIZED PLASMAS IN THE PHYSICAL PICTURE SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article; Proceedings Paper CT WORKSHOP ON ASTROPHYSICAL OPACITIES CY JUL 15-19, 1991 CL IBM VENEZUELA SCI CTR, CARACAS, VENEZUELA SP IBM VENEZUELA, FDN POLAR, VENEZUELAN CONICIT HO IBM VENEZUELA SCI CTR DE EQUATION OF STATE; PLASMAS ID LARKIN PARTITION-FUNCTION; STATISTICAL-MECHANICS; VIRIAL-COEFFICIENTS; OCCUPATION NUMBERS; HYDROGEN AB The equation of state used by the OPAL opacity code is based on a many-body activity expansion of the grand canonical partition function. Herein we give an overview of the method. This approach considers, from the outset, the basic Coulomb interaction between the electrons and nuclei in the system. Consequently, there is no need to factorize the free energy, make assertions about the effect of the plasma environment on bound states, or invoke a mechanism for truncating the internal partition function; as in free energy minimization methods. RP ROGERS, FJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 27 TC 3 Z9 3 U1 0 U2 0 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTR JI Rev. Mex. Astron. Astrofis. PD MAR PY 1992 VL 23 SI SI BP 133 EP 140 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV967 UT WOS:A1992HV96700014 ER PT J AU IGLESIAS, CA ROGERS, FJ AF IGLESIAS, CA ROGERS, FJ TI RESULTS OBTAINED USING THE OPAL CODE SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article; Proceedings Paper CT WORKSHOP ON ASTROPHYSICAL OPACITIES CY JUL 15-19, 1991 CL IBM VENEZUELA SCI CTR, CARACAS, VENEZUELA SP IBM VENEZUELA, FDN POLAR, VENEZUELAN CONICIT HO IBM VENEZUELA SCI CTR DE OPACITIES; SUN - INTERIOR; STARS - VARIABLE ID CEPHEID-TYPE VARIABILITY; SOLAR INTERIOR; ATOMIC DATA; OPACITY CALCULATIONS; STELLAR ENVELOPES; STARK WIDTHS; MODELS; LINES; TRANSITIONS; EQUATION AB The Rosseland mean opacities computed using the OPAL codes show significant differences when compared to the Los Alamos results. The differences have been traced to improvements in both the equation of state and atomic physics in the OPAL code. Furthermore, recent work suggests that the OPAL opacities considerably improve the agreement between observations and stellar models. RP IGLESIAS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 58 TC 1 Z9 1 U1 0 U2 0 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTR JI Rev. Mex. Astron. Astrofis. PD MAR PY 1992 VL 23 SI SI BP 161 EP 170 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV967 UT WOS:A1992HV96700017 ER PT J AU TULLOCK, DL PHANTHIEN, N GRAHAM, AL AF TULLOCK, DL PHANTHIEN, N GRAHAM, AL TI BOUNDARY ELEMENT SIMULATIONS OF SPHERES SETTLING IN CIRCULAR, SQUARE AND TRIANGULAR CONDUITS SO RHEOLOGICA ACTA LA English DT Article DE SETTING SPHERE; BOUNDARY ELEMENT METHOD ID PARTICLE AB Numerical simulations of a spherical particle sedimenting in circular, triangular and square conduits containing a viscous, inertialess, Newtonian fluid were investigated using the Boundary Element Method (BEM). Settling velocities and pressure drops for spheres falling along the centre-lines of the conduits were computed for a definitive range of sphere sizes. The numerical simulations for the settling velocities showed good agreement with existing experimental data. The most accurate analytic solution for a sphere settling along the axis of a circular conduit produced results which were almost indistinguishable from the present BEM calculations. For a sphere falling along the centre-line of a square conduit, the BEM calculations for small spheres agreed well with analytic results. No analytic results for a sphere falling along the axis of a triangular conduit were available for comparison. Extrapolation of the BEM predictions for the pressure drops, to infinitely small spheres, showed remarkable agreement with analytic results. For the circular conduit, the sphere's settling velocity and angular velocity were computed as a function of drop position for small, medium and large spheres. Excellent agreement with a reflection solution was achieved for the small sphere. In addition, end effects were investigated for centre-line drops and compared where possible with available experimental data and analytic results. C1 UNIV SYDNEY,DEPT MECH ENGN,SYDNEY,NSW 2006,AUSTRALIA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RI Phan-Thien, Nhan/I-4705-2012 NR 28 TC 14 Z9 14 U1 0 U2 0 PU DR DIETRICH STEINKOPFF VERLAG PI BERLIN 33 PA C/O SPRINGER-VERLAG, HEIDELBERGER PLATZ 3, 1000 BERLIN 33, GERMANY SN 0035-4511 J9 RHEOL ACTA JI Rheol. Acta PD MAR-APR PY 1992 VL 31 IS 2 BP 139 EP 150 DI 10.1007/BF00373236 PG 12 WC Mechanics SC Mechanics GA HV381 UT WOS:A1992HV38100002 ER PT J AU OTWAY, H VONWINTERFELDT, D AF OTWAY, H VONWINTERFELDT, D TI EXPERT JUDGMENT IN RISK ANALYSIS AND MANAGEMENT - PROCESS, CONTEXT, AND PITFALLS SO RISK ANALYSIS LA English DT Article DE UNCERTAINTY; EXPERT JUDGMENT; PROBABILITY; RISK; EXPERT ELICITATION ID TREES AB The regulation and management of hazardous industrial activities increasingly rely on formal expert judgement processes to provide wisdom in areas of science and technology where traditional "good science" is, in practice, unable to supply unambiguous "facts." Expert judgment has always played a significant, if often unrecognized, role in analysis; however, recent trends are to make it formal, explicit, and documented so it can be identified and reviewed by others. We propose four categories of expert judgment and present three case studies which illustrate some of the pitfalls commonly encountered in its use. We conclude that there will be an expanding policy role for formal expert judgment and that the openness, transparency, and documentation that it requires have implications for enhanced public involvement in scientific and technical affairs. C1 UNIV SO CALIF,INST SAFETY & SYST MANAGEMENT,LOS ANGELES,CA 90089. RP OTWAY, H (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV HLTH & SAFETY,LOS ALAMOS,NM 87544, USA. NR 19 TC 86 Z9 89 U1 1 U2 16 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 83 EP 93 DI 10.1111/j.1539-6924.1992.tb01310.x PG 11 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200009 PM 1574619 ER PT J AU MCKONE, TE AF MCKONE, TE TI A REVIEW OF RISKPRO VERSION 2.1 SO RISK ANALYSIS LA English DT Article ID PARTITION-COEFFICIENTS; 2,3,7,8-TETRACHLORODIBENZO-PARA-DIOXIN; FUGACITY RP MCKONE, TE (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 5507,L-453,LIVERMORE,CA 94550, USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 151 EP 159 DI 10.1111/j.1539-6924.1992.tb01319.x PG 9 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200018 ER PT J AU MORRIS, JM AF MORRIS, JM TI SIGNIFICANCE AND TREATMENT OF VOLATILE ORGANIC-COMPOUNDS IN WATER-SUPPLIES - RAM,NM, CHRISTMAN,RF, CANTOR,KP SO RISK ANALYSIS LA English DT Book Review RP MORRIS, JM (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 161 EP 162 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200020 ER PT J AU WHITE, RK AF WHITE, RK TI UNCERTAINTY IN ENVIRONMENTAL-HEALTH RISK ASSESSMENT - BOGEN,KT SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 162 EP 162 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200022 ER PT J AU WHITE, RK AF WHITE, RK TI ACTIVE AND PASSIVE SMOKING HAZARDS IN THE WORKPLACE - DOUVILLE,JA SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 162 EP 162 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200021 ER PT J AU WHITE, RK AF WHITE, RK TI HANDBOOK OF ENVIRONMENTAL FATE AND EXPOSURE DATA FOR ORGANIC-CHEMICALS, VOL 2, SOLVENTS - HOWARD,PH SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 1 Z9 1 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 163 EP 163 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200024 ER PT J AU WHITE, RK AF WHITE, RK TI WHAT HAPPENED - DIAGNOSING UNFAMILIAR REAL-LIFE SITUATIONS - GROENEWEGEN,AJM SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 1 Z9 1 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 163 EP 164 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200025 ER PT J AU WHITE, RK AF WHITE, RK TI PRACTICAL APPLICATIONS OF QUANTITATIVE STRUCTURE-ACTIVITY-RELATIONSHIPS (QSAR) IN ENVIRONMENTAL CHEMISTRY AND TOXICOLOGY - KARCHER,W, DEVILLERS,J SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 1 Z9 1 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 163 EP 163 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200023 ER PT J AU WHITE, RK AF WHITE, RK TI CHEMICALS IN THE HUMAN FOOD-CHAIN - WINTER,CK, SEIBER,JN, NUCKTON,CF SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 164 EP 165 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200028 ER PT J AU WHITE, RK AF WHITE, RK TI HEALTH AND MEDICAL ASPECTS OF DISASTER PREPAREDNESS - DUFFY,JC SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 164 EP 164 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200027 ER PT J AU WHITE, RK AF WHITE, RK TI OCCUPATIONAL AND ENVIRONMENTAL SAFETY ENGINEERING AND MANAGEMENT - KAVIANIAN,HR, WENTZ,CA SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 164 EP 164 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200026 ER PT J AU WHITE, RK AF WHITE, RK TI DEVELOPMENTAL TOXICOLOGY - RISK ASSESSMENT AND THE FUTURE - HOOD,RD SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD MAR PY 1992 VL 12 IS 1 BP 165 EP 165 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA HJ872 UT WOS:A1992HJ87200029 ER PT J AU ANTOLAK, AJ PONTAU, AE AF ANTOLAK, AJ PONTAU, AE TI SIMULATING ION MICROTOMOGRAPHY DATA FOR IMPROVING RECONSTRUCTION QUALITY SO SCANNING MICROSCOPY LA English DT Article DE ION MICROTOMOGRAPHY; NUCLEAR MICROPROBE; MATERIALS CHARACTERIZATION; PROTON MICROANALYSIS; IMAGE RECONSTRUCTION; SIMULATION CODE; TOMOGRAPHY; RECONSTRUCTION ERRORS ID ENERGY-LOSS; STRAGGLING MEASUREMENTS; ERRORS AB Ion Microtomography (IMT) provides quantitative, fine resolution density imaging of samples for materials characterization. Reconstructed tomographic images are obtained by application of a filtered backprojection algorithm to the collected data. The attainable resolution and data acquisition rate are affected by several parameters. These include the number of ions measured per spot, using either the mean or median residual energy, utilizing Bragg additivity, changing the number of rays or the number of projections and oversampling the data. A tomography simulation computer program is described and used to study the contributions from these effects on the numerical reconstruction of an array of silicon pillars. RP ANTOLAK, AJ (reprint author), SANDIA NATL LABS,DIV THEORET 8341,LIVERMORE,CA 94551, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU SCANNING MICROSCOPY INT PI CHICAGO PA PO BOX 66507, AMF O'HARE, CHICAGO, IL 60666 SN 0891-7035 J9 SCANNING MICROSCOPY JI Scanning Microsc. PD MAR PY 1992 VL 6 IS 1 BP 157 EP 166 PG 10 WC Microscopy SC Microscopy GA JC060 UT WOS:A1992JC06000014 ER PT J AU BRABY, LA AF BRABY, LA TI MICROBEAM STUDIES OF THE SENSITIVITY OF STRUCTURES WITHIN LIVING CELLS SO SCANNING MICROSCOPY LA English DT Article DE MICROBEAM; SINGLE PARTICLE; HIGH LINEAR ENERGY TRANSFER; CELL SURVIVAL AB Determining the biological effects of low doses of radiation with high linear energy transfer (LET) is complicated by the stochastic nature of charged-particle interactions. Populations of cells exposed to very low radiation doses contain a few cells which have been hit by a charged particle, while the majority of the cells receive no radiation damage. At somewhat higher doses, a few cells receive two or more events. Because the effects of damage produced by separate events can interact in the cell, we have had to make assumptions about the nature of these interactions in order to interpret the results of the experiments. Many of those assumptions can be tested if we can be sure of the number of charged-particle events which occur in individual cells, and correlate this number with the biological effect. We have developed a special irradiation facility at Pacific Northwest Laboratory (PNL) to control the actual number of charged particle tracks that pass through cell nuclei. The beam from a 2 MeV tandem accelerator is collimated to approximately 5-mu-m. Cells, grown in special dishes with 1.5-mu-m thick plastic bottoms, are positioned so that the desired portion of the cell aligns with the collimator. A shutter in the beam line is opened and closed after the desired number of particle tracks has been counted. This approach can be used to investigate the effects of the interaction between irradiated and unirradiated cells in an organized system, as well as to study the effects of spatial and temporal distribution of radiation damage within single cells. We expect that this approach will lead to a better understanding of the mechanisms of high LET radiation effects. RP BRABY, LA (reprint author), PACIFIC NW LAB, P8-47, RICHLAND, WA 99352 USA. NR 16 TC 17 Z9 18 U1 1 U2 2 PU SCANNING MICROSCOPY INT PI CHICAGO PA PO BOX 66507, AMF O'HARE, CHICAGO, IL 60666 SN 0891-7035 J9 SCANNING MICROSCOPY JI Scanning Microsc. PD MAR PY 1992 VL 6 IS 1 BP 167 EP 175 PG 9 WC Microscopy SC Microscopy GA JC060 UT WOS:A1992JC06000015 PM 1626238 ER PT J AU CHEN, JS SALMERON, M DEVINE, TM AF CHEN, JS SALMERON, M DEVINE, TM TI INTERGRANULAR VS TRANSGRANULAR STRESS-CORROSION CRACKING OF CU 30-AU SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ALPHA-BRASS C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CHEN, JS (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 15 TC 11 Z9 12 U1 0 U2 2 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 MAR 1 PY 1992 VL 26 IS 5 BP 739 EP 742 DI 10.1016/0956-716X(92)90430-M PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HE869 UT WOS:A1992HE86900009 ER PT J AU VENKATESH, R CHAWLA, KK FERBER, M AF VENKATESH, R CHAWLA, KK FERBER, M TI INFLUENCE OF TIN DIOXIDE INTERPHASE ON THE RESIDUAL-STRESSES IN ALUMINA FIBER GLASS COMPOSITES - OBSERVATIONS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Note ID THERMAL-STRESS C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP VENKATESH, R (reprint author), NEW MEXICO INST MIN & TECHNOL,SOCORRO,NM 87801, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD MAR 1 PY 1992 VL 26 IS 5 BP 859 EP 860 DI 10.1016/0956-716X(92)90452-K PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HE869 UT WOS:A1992HE86900031 ER PT J AU BOUCHALKHA, A KIM, DS JACOB, JM ZHOU, JF SONG, JJ KLEM, JF AF BOUCHALKHA, A KIM, DS JACOB, JM ZHOU, JF SONG, JJ KLEM, JF TI PHONON COUPLING IN GAAS/ALXGA1-XAS OBSERVED BY PICOSECOND RAMAN-SCATTERING SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON HOT CARRIERS IN SEMICONDUCTORS ( HCIS-7 ) CY JUL 01-05, 1991 CL NARA, JAPAN SP NARA PREFECTURE, NARA CITY, NARA CONVENT BUR, WATANABE MEM FDN ADV SCI & TECHNOL ID GAAS-ALAS SUPERLATTICES; OPTICAL PHONONS; QUANTUM WELLS; CONFINED LO; SPECTROSCOPY; GAAS-ALXGA1-XAS AB We measure the hot phonon population of the GaAs LO phonons using a picosecond Raman scattering technique. Our samples were a series of GaAs/Al0.4Ga0.6As superlattices (SLS) with a fixed well width (L(Z)) and varying barrier width (L(b)). An abrupt increase in the phonon generation rate was observed as L(b) decreased over a narrow range. This is interpreted as the onset of significant well-to-well coupling of the confined GaAs LO phonons. An estimate of the LO phonon penetration depth into the Al0.4Ga0.6As barriers is obtained from this transition. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BOUCHALKHA, A (reprint author), OKLAHOMA STATE UNIV,CTR LASER RES,STILLWATER,OK 74078, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD MAR PY 1992 VL 7 IS 3B BP B167 EP B169 DI 10.1088/0268-1242/7/3B/040 PG 3 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA HL262 UT WOS:A1992HL26200042 ER PT J AU PELOUCH, WS ELLINGSON, RJ POWERS, PE TANG, CL SZMYD, DM NOZIK, AJ AF PELOUCH, WS ELLINGSON, RJ POWERS, PE TANG, CL SZMYD, DM NOZIK, AJ TI INVESTIGATION OF HOT-CARRIER RELAXATION IN QUANTUM-WELL AND BULK GAAS AT HIGH CARRIER DENSITIES SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON HOT CARRIERS IN SEMICONDUCTORS ( HCIS-7 ) CY JUL 01-05, 1991 CL NARA, JAPAN SP NARA PREFECTURE, NARA CITY, NARA CONVENT BUR, WATANABE MEM FDN ADV SCI & TECHNOL ID LUMINESCENCE SPECTROSCOPY AB An investigation of the hot carrier relaxation in GaAs/(AlGa)As quantum wells and bulk GaAs in the high carrier density limit is presented. Using a time-resolved luminescence up-conversion technique with less-than-or-equal-to 80 fs temporal resolution, carrier temperatures are measured in the 100 fs to 2 ns range. Our results show that hot carrier cooling in quantum wells becomes significantly slower than in the bulk for carrier densities greater than 2 x 10(18) cm-3. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP PELOUCH, WS (reprint author), CORNELL UNIV,CTR MAT SCI,ITHACA,NY 14853, USA. RI Ellingson, Randy/H-3424-2013 NR 19 TC 6 Z9 6 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD MAR PY 1992 VL 7 IS 3B BP B337 EP B339 DI 10.1088/0268-1242/7/3B/086 PG 3 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA HL262 UT WOS:A1992HL26200088 ER PT J AU WANG, WB SHUM, K ALFANO, RR SZMYD, D NOZIK, AJ AF WANG, WB SHUM, K ALFANO, RR SZMYD, D NOZIK, AJ TI INVESTIGATION OF THE L6-X6 INTERVALLEY SCATTERING IN ALXGA1-XAS BY MEASURING HOT CARRIER DYNAMICS IN A K-NOT-EQUAL-O SATELLITE VALLEY SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON HOT CARRIERS IN SEMICONDUCTORS ( HCIS-7 ) CY JUL 01-05, 1991 CL NARA, JAPAN SP NARA PREFECTURE, NARA CITY, NARA CONVENT BUR, WATANABE MEM FDN ADV SCI & TECHNOL ID GAAS; SPECTROSCOPY; TIME; ABSORPTION; RATES; SEMICONDUCTORS AB The time evolution of the electron population in the bottom of the X6 valley in Al0.6Ga0.4As was obtained by a femtosecond visible-pump and infrared (IR)-probe absorption spectroscopy. The L6 --> X6 intervalley scattering time of approximately 200 fs was determined from the measured kinetic data. The role of the L6 --> X6 intervalley scattering for the relaxation process of hot carriers was revealed. C1 CUNY,GRAD SCH,NEW YORK,NY 10021. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP WANG, WB (reprint author), CUNY CITY COLL,INST ULTRASFAST SPECT & LASERS,DEPT PHYS & ELECT ENGN,NEW YORK,NY 10031, 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 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD MAR PY 1992 VL 7 IS 3B BP B173 EP B173 DI 10.1088/0268-1242/7/3B/042 PG 1 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA HL262 UT WOS:A1992HL26200044 ER PT J AU WEMAN, H TREACY, GM HJALMARSON, HP LAW, KK BERGMAN, JP MERZ, JL GOSSARD, AC AF WEMAN, H TREACY, GM HJALMARSON, HP LAW, KK BERGMAN, JP MERZ, JL GOSSARD, AC TI IMPACT IONIZATION OF FREE AND BOUND EXCITONS IN ALGAAS/GAAS QUANTUM-WELLS SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON HOT CARRIERS IN SEMICONDUCTORS ( HCIS-7 ) CY JUL 01-05, 1991 CL NARA, JAPAN SP NARA PREFECTURE, NARA CITY, NARA CONVENT BUR, WATANABE MEM FDN ADV SCI & TECHNOL AB We present a study of the effect of a parallel electric field on the excitonic photoluminescence (PL) from AlGaAs/n-GaAs quantum wells (QWS). We observe sharp thresholds in the quenching of luminescence from free and bound excitons at fields near a few tens of V cm-1. PL lifetime measurements of the excitons show that the recombination lifetime is unaffected during the quenching. The mechanism responsible for the observed effects will be shown to be due to impact ionization of the excitons by the free carriers heated in the electric field. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. LINKOPING UNIV,DEPT PHYS & MEASUREMENT TECHNOL,S-58183 LINKOPING,SWEDEN. UNIV CALIF SANTA BARBARA,DEPT MAT,SANTA BARBARA,CA 93106. RP WEMAN, H (reprint author), UNIV CALIF SANTA BARBARA,CTR QUANTIZED ELECTR STRUCT,SANTA BARBARA,CA 93106, USA. RI Weman, Helge/A-6245-2013; Materials, Semiconductor/I-6323-2013; Bergman, Peder/G-2202-2014 NR 9 TC 4 Z9 4 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD MAR PY 1992 VL 7 IS 3B BP B517 EP B519 DI 10.1088/0268-1242/7/3B/135 PG 3 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA HL262 UT WOS:A1992HL26200137 ER PT J AU JARDINE, PM DUNNIVANT, FM SELIM, HM MCCARTHY, JF AF JARDINE, PM DUNNIVANT, FM SELIM, HM MCCARTHY, JF TI COMPARISON OF MODELS FOR DESCRIBING THE TRANSPORT OF DISSOLVED ORGANIC-CARBON IN AQUIFER COLUMNS SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID POLYNUCLEAR ALUMINUM; ADSORPTION; CONTAMINANTS; MONONUCLEAR; SPECIATION; FERRON; ACIDS AB Dissolved organic carbon (DOC) is a reactive constituent in aquifer and soil media and equilibrates between the mobile aqueous phase and the immobile solid phase. Since DOC is believed to accelerate the transport of associated contaminants, yet is known to interact with aquifer and soil material, our objective was to define and model those processes governing DOC adsorption to porous media that may affect the cotransport of contaminants. Column displacement experiments of DOC through aquifer sediments were modeled with various formulations of the convective-dispersive equation, which considered time-dependent adsorption reactions and linear or nonlinear adsorption processes. Batch equilibrium adsorption isotherm and kinetic studies for DOC interaction with the sediments were used to parameterize the transport models. The equilibrium DOC-adsorption isotherm was nonlinear and was adequately described by the Langmuir equation. The adsorption of DOC to the aquifer sediment was also time dependent and the batch results could be described by two simultaneous reaction rates for solution concentrations greater-than-or-equal-to 10 mg DOC L-1 and a single reaction rate for solution concentrations < 10 mg DOC L-1. Observed DOC breakthrough curves (BTCs) with influent concentrations greater-than-or-equal-to 10 mg DOC L-1, were adequately modeled as two-site, nonlinear adsorption processes, with DOC interactions with both types of sites being time dependent. Batch adsorption and kinetic parameters were generally successful in describing DOC transport; however, the magnitude of the initial batch rate coefficient was significantly larger than that observed for the displacement experiments. The extended tailing of the observed DOC BTCs was influenced more by the slow, time-dependent adsorption of DOC during transport than to the nonlinear features of the adsorption isotherms. Observed DOC BTCs with influent concentrations < 10 mg DOC L-1 did not exhibit extensive tailing and were modeled as a one-site, linear or nonlinear, time-dependent adsorption process. C1 LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. RP JARDINE, PM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 33 TC 60 Z9 60 U1 2 U2 9 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD MAR-APR PY 1992 VL 56 IS 2 BP 393 EP 401 PG 9 WC Soil Science SC Agriculture GA HR731 UT WOS:A1992HR73100009 ER PT J AU DUNNIVANT, FM JARDINE, PM TAYLOR, DL MCCARTHY, JF AF DUNNIVANT, FM JARDINE, PM TAYLOR, DL MCCARTHY, JF TI TRANSPORT OF NATURALLY-OCCURRING DISSOLVED ORGANIC-CARBON IN LABORATORY COLUMNS CONTAINING AQUIFER MATERIAL SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID HUMIC MATERIALS; SOIL; ADSORPTION; SORPTION; WATER; CONTAMINANTS; PARTITION; RETENTION; SYSTEMS; MATTER AB The subsurface transport of ionic and nonionic pollutants may be strongly impacted by the movement of naturally occurring dissolved organic carbon (DOC) in aquifers. Thus, the adsorption, desorption, and transport of DOC in laboratory columns containing well-packed aquifer material was investigated. Data showed that the breakthrough of DOC from aquifer columns was the result of complex adsorption reactions between DOC and the aquifer material. Breakthrough curves (BTCs) of the DOC were characterized by an initial rapid concentration increase followed by extended tailing to long times. The extensive tailing of the BTCs was attributed primarily to the slow adsorption kinetics of DOC to the aquifer material and the nonlinear nature of the adsorption isotherm. Independent experiments suggested that the size exclusion of DOC from aquifer pores was negligible. The time required to saturate the aquifer material with organic C was dependent on the influent DOC concentration, with lower organic influent levels requiring longer pulse durations to fully saturate the aquifer sediment with organic C. Hydrophobic constituents of the DOC were preferentially adsorbed while hydrophilic components were rapidly transported through the aquifer columns. Spectral analysis (light absorbance at 260 nm) of the column effluents confirmed that the composition of the mobile organic C changed during the breakthrough of DOC. Data from this investigation demonstrate that DOC can be mobile in soil systems, and emphasizes the need to evaluate the co-transport of pollutants by DOC. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831. NR 30 TC 112 Z9 119 U1 5 U2 13 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD MAR-APR PY 1992 VL 56 IS 2 BP 437 EP 444 PG 8 WC Soil Science SC Agriculture GA HR731 UT WOS:A1992HR73100016 ER PT J AU HALMANN, M HUNT, AJ SPATH, D AF HALMANN, M HUNT, AJ SPATH, D TI PHOTODEGRADATION OF DICHLOROMETHANE, TETRACHLOROETHYLENE AND 1,2-DIBROMO-3-CHLOROPROPANE IN AQUEOUS SUSPENSIONS OF TIO(2) WITH NATURAL, CONCENTRATED AND SIMULATED SUNLIGHT SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID TITANIUM-DIOXIDE; PHOTOCATALYTIC DEGRADATION; HETEROGENEOUS PHOTOCATALYSIS; ONE-ELECTRON; SEMICONDUCTOR SUSPENSION; HUMIC SUBSTANCES; ORGANIC SOLUTES; RATE CONSTANTS; WATER; TIO2 AB The photodegradation of dichloromethane and of tetrachloroethylene in dilute aqueous solutions and of 1,2-dibromo-3-chloropropane (DBCP) in contaminated groundwater was carried out by illumination with natural, concentrated and simulated sunlight in the presence of air and suspended TiO2 or TiO2 Coated on silica gel. With tetrachloroethylene in homogeneous aqueous solutions, illumination with a high pressure mercury lamp resulted in photodegradation even in the absence of any additive, but the rate was significantly enhanced in the presence of powdered TiO2. The TiO2-promoted degradation of tetrachloroethylene with light of 313 nm or with natural sunlight was further increased by the addition of hydrogen peroxide. The rate of the homogeneous photolysis of tetrachloroethylene by illumination with light longer than 300 nm was not affected by the presence of nitrate ion. Using concentrated sunlight, the Tate of the photodegradation of aqueous tetrachloroethylene in the presence of H2O2 and suspended TiO2 was approximately linear with the light intensity, up to a light flux of about 80 kW m-2. With DBCP in polluted well-water from California, illumination in the presence of TiO2 resulted in a decrease in the halocarbon content of the water from the initial high concentration of 2.9 +/- 0.2 ppb to 0.4 +/- 0.1 ppb. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. CALIF DEPT HLTH SERV,BERKELEY,CA 94709. RP HALMANN, M (reprint author), WEIZMANN INST SCI,DEPT ENVIRONM SCI & ENERGY RES,IL-76100 REHOVOT,ISRAEL. NR 55 TC 17 Z9 17 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD MAR PY 1992 VL 26 IS 1-2 BP 1 EP 16 DI 10.1016/0927-0248(92)90121-5 PG 16 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA HQ110 UT WOS:A1992HQ11000001 ER PT J AU LUFT, W STAFFORD, B VONROEDERN, B DEBLASIO, R AF LUFT, W STAFFORD, B VONROEDERN, B DEBLASIO, R TI PROSPECTS FOR AMORPHOUS-SILICON PHOTOVOLTAICS SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Significant progress has been achieved in amorphous silicon photovoltaic technology since the first commercial square-foot-size modules were introduced in 1984. Over the years, quality control, materials, module size, and module packaging have improved, but the basic cell structure used in the modules has changed little. Based on the manufacturing experience since 1984 and prototype module research, larger and more advanced manufacturing plants have been designed, are under construction, or coming on line soon. The economics of large-scale photovoltaic systems may force reconsideration of amorphous silicon module design and construction, which, for the most part, has been directed toward small power systems. This paper summarizes progress that has been made since 1984, discusses expectations for photovoltaics in general, and presents the technological path amorphous silicon technology is pursuing to become competitive in the photovoltaics market. RP LUFT, W (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 14 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD MAR PY 1992 VL 26 IS 1-2 BP 17 EP 26 DI 10.1016/0927-0248(92)90122-6 PG 10 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA HQ110 UT WOS:A1992HQ11000002 ER PT J AU PATIL, HD UPADHYAY, RV SHAMKUWAR, NR KULKARNI, RG AF PATIL, HD UPADHYAY, RV SHAMKUWAR, NR KULKARNI, RG TI MAGNETIC-ORDERING IN DISORDERED SPINELS ZNXMG1-XFECRO4 SO SOLID STATE COMMUNICATIONS LA English DT Article AB The magnetic properties of the disordered spinel system ZnxMg1-x-FeCrO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8) have been investigated through Mossbauer spectroscopy, magnetization and susceptibility measurements. Magnetization results indicate a canting of the B-site moments with an average canting angle that increases with x suggesting the magnetic structure to be non-collinear. Mossbauer results show the presence of two types of spin-spin relaxation: smaller magnetic clusters relaxing at a faster rate which give rise to a quadrupole doublet at x less-than-or-equal-to 0.4 at 300 K, while for x greater-than-or-equal-to 0.6, the observed behaviour at 80 K and 300 K suggests a cluster spin glass type of ordering. The results of the a.c. susceptibility show normal ferrimagnetic behaviour for x less-than-or-equal-to 0.4 and for x greater-than-or-equal-to 0.6, they show the existence of magnetic ordering, which supports the Mossbauer measurements. C1 SAVANNAH RIVER ECOL LAB,DEPT PHYS,AIKEN,SC 29801. BHAVANAGAR UNIV,DEPT PHYS,BHAVNAGAR 364002,INDIA. RP PATIL, HD (reprint author), MARATHWADA UNIV,DEPT PHYS,AURANGABAD 431004,MAHARASHTRA,INDIA. NR 13 TC 9 Z9 9 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD MAR PY 1992 VL 81 IS 12 BP 1011 EP 1014 DI 10.1016/0038-1098(92)90855-4 PG 4 WC Physics, Condensed Matter SC Physics GA HN336 UT WOS:A1992HN33600008 ER PT J AU AHRENKIEL, RK AF AHRENKIEL, RK TI MEASUREMENT OF MINORITY-CARRIER LIFETIME BY TIME-RESOLVED PHOTOLUMINESCENCE SO SOLID-STATE ELECTRONICS LA English DT Article ID INTERFACE RECOMBINATION VELOCITY; GAALAS-GAAS HETEROSTRUCTURES; INTERNAL QUANTUM EFFICIENCY; VAPOR-PHASE EPITAXY; SURFACE-FREE GAAS; SEMICONDUCTOR-LASERS; DIFFUSION LENGTH; SELF-ABSORPTION; SHIFT; DECAY AB Much of the current compound semiconductor device research is based on minority-carrier devices such as heterojunction bipolar transistors and diode lasers. The improvement of minority-carrier-parameters is the focal point of much ongoing materials research. The minority-carrier lifetimes of III-V compound semiconductors are most easily characterized by time-resolved photoluminescence. This is a quick and contactless technique which directly measures the excess minority-carrier carrier density. By using a focused laser beam as the excitation source, the required sample area may be very small. In special diagnostic structures which utilize a confinement or passivating layer, the interface recombination velocity can be determined. Here I will describe the measurement theory and measurement techniques which are used in our laboratory. Recent developments in the III-V materials technology will be reviewed. RP AHRENKIEL, RK (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 63 TC 75 Z9 75 U1 5 U2 31 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD MAR PY 1992 VL 35 IS 3 BP 239 EP 250 DI 10.1016/0038-1101(92)90228-5 PG 12 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA HM268 UT WOS:A1992HM26800003 ER PT J AU LOVEJOY, ML MELLOCH, MR AHRENKIEL, RK LUNDSTROM, MS AF LOVEJOY, ML MELLOCH, MR AHRENKIEL, RK LUNDSTROM, MS TI MEASUREMENT CONSIDERATIONS FOR ZERO-FIELD TIME-OF-FLIGHT STUDIES OF MINORITY-CARRIER DIFFUSION IN III-V SEMICONDUCTORS SO SOLID-STATE ELECTRONICS LA English DT Article ID P-TYPE GAAS; ELECTRON-MOBILITY; TRANSPORT; HETEROSTRUCTURES; LENGTH AB The zero-field time-of-flight technique for measuring minority carrier diffusivity in III-V semiconductors is critically examined. The effects of photon recycling, circuit parasitics and test structure design are examined in detail as is the analysis procedure used to extract the minority carrier diffusion coefficient. The analysis shows that substantial errors can result if test structures are not carefully designed. Guidelines for designing test structures and for analyzing measured results are presented. This work demonstrates that the technique can be an accurate and convenient method for characterizing the doping-and temperature-dependence of minority carrier diffusivity, or equivalently mobility, in compound semiconductors. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP LOVEJOY, ML (reprint author), PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907, USA. NR 22 TC 15 Z9 15 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD MAR PY 1992 VL 35 IS 3 BP 251 EP 259 DI 10.1016/0038-1101(92)90229-6 PG 9 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA HM268 UT WOS:A1992HM26800004 ER PT J AU ECKERT, J KEARLEY, GJ AF ECKERT, J KEARLEY, GJ TI SPECTROSCOPIC APPLICATIONS OF INELASTIC NEUTRON-SCATTERING - THEORY AND PRACTICE - FOREWORD SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA English DT Editorial Material C1 INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RP ECKERT, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS NEUTRON SCATTERING CTR,MAIL STOP H805,LOS ALAMOS,NM 87545, USA. NR 0 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8539 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD MAR PY 1992 VL 48 IS 3 BP 269 EP 270 DI 10.1016/0584-8539(92)80057-4 PG 2 WC Spectroscopy SC Spectroscopy GA HH793 UT WOS:A1992HH79300001 ER PT J AU ECKERT, J AF ECKERT, J TI THEORETICAL INTRODUCTION TO NEUTRON-SCATTERING SPECTROSCOPY SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA English DT Article ID HYDROGEN; DYNAMICS AB Some basic background on the interaction of neutrons with condensed matter is given with emphasis on the differences with other experimental probes. Neutron scattering cross-sections are described for those dynamical processes that are likely to be of importance in chemical applications of inelastic neutron scattering. RP ECKERT, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS NEUTRON SCATTERING CTR,MAIL STOP,LOS ALAMOS,NM 87545, USA. NR 25 TC 13 Z9 13 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8539 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD MAR PY 1992 VL 48 IS 3 BP 271 EP 283 DI 10.1016/0584-8539(92)80058-5 PG 13 WC Spectroscopy SC Spectroscopy GA HH793 UT WOS:A1992HH79300002 ER PT J AU ECKERT, J AF ECKERT, J TI DYNAMICS OF THE MOLECULAR-HYDROGEN LIGAND IN METAL-COMPLEXES SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA English DT Article ID POLYHYDRIDE COMPLEXES; DIHYDROGEN COMPLEXES; NEUTRON-DIFFRACTION; XENON SOLUTION; SOLID-STATE; X-RAY; R =; H-2; ETA-2-H-2; NMR AB The recent discovery that certain metal complexes can bind hydrogen in molecular form as they do other small molecules has presented a unique opportunity for neutron scattering to assist in the determination of electronic details of the novel chemical bond formed between this dihydrogen ligand and the metal. This can be accomplished by comparative studies of the barriers to rotation for the dihydrogen ligand in various complexes where either the metal center or the other metal ligands are changed together with appropriate theoretical analyses. This information can be extracted from vibrational and rotational inelastic neutron scattering spectra. Results from a wide variety of molecular hydrogen complexes are reviewed and their implications for the metal-dihydrogen chemical bond are discussed along with reference to various theoretical approaches to this problem. RP ECKERT, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS NEUTRON SCATTERING CTR,MAIL STOP H805,LOS ALAMOS,NM 87545, USA. NR 41 TC 34 Z9 34 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8539 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD MAR PY 1992 VL 48 IS 3 BP 363 EP 378 DI 10.1016/0584-8539(92)80064-4 PG 16 WC Spectroscopy SC Spectroscopy GA HH793 UT WOS:A1992HH79300008 ER PT J AU TROUW, FR AF TROUW, FR TI MOLECULAR-DYNAMICS SIMULATION AND INELASTIC NEUTRON-SCATTERING SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA English DT Article ID GRAPHITE-INTERCALATION COMPOUNDS; HYDROGEN-BOND FLUCTUATIONS; LONG-TIME REGIME; CONDENSED PHASES; HYDROCARBON MOLECULES; PAIR POTENTIALS; DIFFUSION; LIQUID; WATER; METHANE AB The molecular dynamics simulation method is discussed with specific reference to inelastic neutron scattering. A brief description of the two methods is presented and the relationship between them is explored. Inelastic neutron scattering is subdivided into two main areas, incoherent and coherent scattering, and some examples from the literature are reviewed for cases where the neutron inelastic scattering law is calculated. In addition, a detailed simulation of the diffusion of methane in the zeolite ZSM-5 is presented and compared with experiment. The simulation results provide insight into the nature of the intracrystalline diffusion of the adsorbate, while also providing the expected neutron scattering function. A direct comparison of the calculated and measured scattering laws indicates that there is general agreement between experiment and theory although the interpretation of quasielastic scattering using a Langevin diffusion model is inappropriate. The computer simulation model provides an unambiguous link between experiment and the microscopic origin of the observed quasielastic broadening. RP TROUW, FR (reprint author), ARGONNE NATL LAB,9700 S CASS AV,ARGONNE,IL 60439, USA. NR 50 TC 15 Z9 15 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8539 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD MAR PY 1992 VL 48 IS 3 BP 455 EP 476 DI 10.1016/0584-8539(92)80068-8 PG 22 WC Spectroscopy SC Spectroscopy GA HH793 UT WOS:A1992HH79300012 ER PT J AU BADDORF, AP ITCHKAWITZ, BS AF BADDORF, AP ITCHKAWITZ, BS TI IDENTIFICATION OF OXYGEN SPECIES ON SINGLE-CRYSTAL K(110) SO SURFACE SCIENCE LA English DT Article ID RAY-PHOTOELECTRON-SPECTROSCOPY; ALKALI-METAL OXIDES; PHOTOEMISSION; POTASSIUM AB The interaction of oxygen with a single-crystal K(110) surface has been studied using HREELS, XPS, and LEED. Vibrational spectroscopy reveals that at 88 K oxygen is initially chemisorbed dissociatively. Higher exposures lead to occupation of subsurface sites and formation of a bulk K2O oxide. In contrast with the interpretations of previous photoemission experiments, no molecular species were observed. Oxygen is transferred from surface to subsurface sites when the sample is annealed to 240 K, or when the surface is irradiated by AlK-alpha X-rays. The latter appears to be a direct photochemical process. Even with both chemisorbed and oxide species present, the surface remains reactive. No long-range order was observed after oxygen adsorption. C1 UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP BADDORF, AP (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Baddorf, Arthur/I-1308-2016 OI Baddorf, Arthur/0000-0001-7023-2382 NR 13 TC 12 Z9 12 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 1 PY 1992 VL 264 IS 1-2 BP 73 EP 80 DI 10.1016/0039-6028(92)90166-4 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HH776 UT WOS:A1992HH77600021 ER PT J AU CHEN, SP AF CHEN, SP TI ANOMALOUS RELAXATIONS OF (0001) AND (1010) SURFACES IN HCP METALS SO SURFACE SCIENCE LA English DT Letter ID EMBEDDED-ATOM METHOD; LATTICE-RELAXATION; MULTILAYER RELAXATION; GRAIN-BOUNDARIES; NI3AL; NI; AL AB We have used local-volume potentials (LVP) to study the (0001) and (1010BAR) surfaces of 13 hcp metals. The calculated structures and energies of (0001) and (1010BAR) surfaces show some agreement with experiment, particularly as to the sign of the relaxation. All the metals show deep changes in interlayer spacings. On (0001) surfaces Co, Gd, Hf, Mg, Re, Ru, Ti and Tl show first layer-spacing contraction while Be, Dy, Er, Sc and Zr show anomalous first layer-spacing expansion. Similarly, on (1010BAR) surfaces Co, Dy, Gd, Mg, Re, Ru, Ti and Tl show first layer-spacing contraction while Be, Er, Hf, Sc and Zr show anomalous first layer-spacing expansions. The prediction of first layer-spacing expansion of the Be(0001) surface agrees with a recent low-energy electron diffraction (LEED) experiment. The results on hcp (0001) surfaces contrast with relaxation on fcc (111) surfaces, also reported here, where the model always give contractions. RP UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 36 TC 31 Z9 36 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD MAR 1 PY 1992 VL 264 IS 1-2 BP L162 EP L168 DI 10.1016/0039-6028(92)90148-Y PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HH776 UT WOS:A1992HH77600003 ER PT J AU MODIS, T DEBECKER, A AF MODIS, T DEBECKER, A TI CHAOS-LIKE STATES CAN BE EXPECTED BEFORE AND AFTER LOGISTIC GROWTH SO TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE LA English DT Article AB Instabilities associated with population growth can be simulated by putting the logistic growth curve in a discrete form. In contrast to the usual derivation of chaos, which can only explain instabilities at the top of the curve, this method can also account for fluctuations during the early phases of the niche-filling process. Precursors, a steep initial rise, and final instabilities can all be interrelated. Industrial examples are given of logistic growth alternating with periods of chaotic fluctuations. C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. COLUMBIA UNIV,NEW YORK,NY 10027. NEVIS LABS,IRVINGTON ON HUDSON,NY. UNIV LYON 1,F-69365 LYONS 2,FRANCE. UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND. RP MODIS, T (reprint author), DIGITAL EQUIPMENT CORP,MANAGEMENT SCI,12 AVE MORGINES,1213 PETIT LANCY 1,GENEVA,SWITZERLAND. NR 12 TC 25 Z9 25 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0040-1625 J9 TECHNOL FORECAST SOC JI Technol. Forecast. Soc. Chang. PD MAR PY 1992 VL 41 IS 2 BP 111 EP 120 DI 10.1016/0040-1625(92)90058-2 PG 10 WC Business; Planning & Development SC Business & Economics; Public Administration GA HN851 UT WOS:A1992HN85100001 ER PT J AU MILLS, MJ DAW, MS THOMAS, GJ COSANDEY, F AF MILLS, MJ DAW, MS THOMAS, GJ COSANDEY, F TI HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPY OF GRAIN-BOUNDARIES IN ALUMINUM AND CORRELATION WITH ATOMISTIC CALCULATIONS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON THE STRUCTURE AND PROPERTIES OF INTERFACES CY JAN 03-06, 1991 CL WICKENBURG, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV CTR SOLID STATE SCI ID EMBEDDED-ATOM-METHOD; TILT BOUNDARY; AU; DISLOCATIONS; SURFACES; METALS; GOLD; NIO AB The application of high-resolution transmission electron microscopy (HRTEM) to the study of several symmetric tilt boundaries in aluminum is presented. The observed images are correlated with simulated images based on molecular statics calculations using the embedded atom method. In general, good agreement is obtained between experiment and theory. The complementary aspects of comparing HRTEM results with atomistic calculations are also discussed with respect to obtaining three-dimensional information about the boundaries and accounting for thin-foil effects on the observed structures. C1 RUTGERS STATE UNIV,DEPT MECH & MAT SCI,PISCATAWAY,NJ 08854. RP MILLS, MJ (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 23 TC 35 Z9 35 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD MAR PY 1992 VL 40 IS 3 BP 247 EP 257 DI 10.1016/0304-3991(92)90121-Y PG 11 WC Microscopy SC Microscopy GA HR624 UT WOS:A1992HR62400006 ER PT J AU MERKLE, KL AF MERKLE, KL TI QUANTIFICATION OF ATOMIC-SCALE GRAIN-BOUNDARY PARAMETERS BY HIGH-RESOLUTION ELECTRON-MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON THE STRUCTURE AND PROPERTIES OF INTERFACES CY JAN 03-06, 1991 CL WICKENBURG, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV CTR SOLID STATE SCI ID STRUCTURE-ENERGY CORRELATION; RIGID-BODY DISPLACEMENTS; FCC METALS; PLANES; TILT; NIO AB Recent grain boundary modeling studies in fcc metals have revealed global correlations between GB energy and (i) the rigid-body translation normal to the grain boundary (the so-called volume expansion) and (ii) the degree of deviation of the local atomic coordination across the interface relative to the ideal lattice. This communication describes an approach towards evaluation of such parameters by analyzing images obtained by axial high-resolution electron microscopy, utilizing digital image-processing techniques. Observations on several <110BAR> tilt GB's in Au are presented. RP MERKLE, KL (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 44 TC 32 Z9 32 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD MAR PY 1992 VL 40 IS 3 BP 281 EP 290 DI 10.1016/0304-3991(92)90125-4 PG 10 WC Microscopy SC Microscopy GA HR624 UT WOS:A1992HR62400010 ER PT J AU SIEGEL, RW THOMAS, GJ AF SIEGEL, RW THOMAS, GJ TI GRAIN-BOUNDARIES IN NANOPHASE MATERIALS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON THE STRUCTURE AND PROPERTIES OF INTERFACES CY JAN 03-06, 1991 CL WICKENBURG, AZ SP NATL SCI FDN, FACIL HIGH RESOLUT ELECTRON MICROSCOPY, ARIZONA STATE UNIV CTR SOLID STATE SCI ID RANDOMLY ARRANGED ATOMS; SOLID-STATE STRUCTURE; NANOCRYSTALLINE MATERIALS; TIO2; SPECTROSCOPY; PALLADIUM; DISORDER; HREM AB Among the atoms in nanophase materials (with grain sizes less than 100 nm) a significant fraction are associated with grain boundaries. Properties of these new materials are thus affected not only by their reduced grain-size scale, but also by the nature of their grain boundary structures. High-resolution electron microscopy observations combined with image simulations, as well as complementary results from Raman spectroscopy and small-angle neutron scattering experiments, indicate that nanophase boundaries are similar in structure to those normally encountered in conventional coarse-grained polycrystals. They are commonly observed to be relatively flat and faceted with well-ordered localized structures. The available information on grain boundary structures in nanophase materials is briefly reviewed and future opportunities for measuring grain boundary properties are considered. C1 SANDIA NATL LABS,DIV 8343,LIVERMORE,CA 94551. RP SIEGEL, RW (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 34 TC 65 Z9 67 U1 7 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD MAR PY 1992 VL 40 IS 3 BP 376 EP 384 DI 10.1016/0304-3991(92)90135-7 PG 9 WC Microscopy SC Microscopy GA HR624 UT WOS:A1992HR62400020 ER PT J AU KRAJCSI, P TOLLEFSON, AE ANDERSON, CW STEWART, AR CARLIN, CR WOLD, WSM AF KRAJCSI, P TOLLEFSON, AE ANDERSON, CW STEWART, AR CARLIN, CR WOLD, WSM TI THE E3-10.4K PROTEIN OF ADENOVIRUS IS AN INTEGRAL MEMBRANE-PROTEIN THAT IS PARTIALLY CLEAVED BETWEEN ALA22 AND ALA23 AND HAS A CCYT ORIENTATION SO VIROLOGY LA English DT Article ID E3 TRANSCRIPTION UNIT; TUMOR-NECROSIS-FACTOR; EPIDERMAL GROWTH-FACTOR; REGION E3; SIGNAL-SEQUENCE; ENDOPLASMIC-RETICULUM; NUCLEOTIDE-SEQUENCE; MESSENGER-RNAS; LYMPHOCYTES-T; MW PROTEIN C1 ST LOUIS UNIV,SCH MED,INST MOLEC VIROL,3681 PK AVE,ST LOUIS,MO 63110. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NCI NIH HHS [CA49540, CA24710] NR 47 TC 32 Z9 33 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 0042-6822 J9 VIROLOGY JI Virology PD MAR PY 1992 VL 187 IS 1 BP 131 EP 144 DI 10.1016/0042-6822(92)90302-6 PG 14 WC Virology SC Virology GA HD628 UT WOS:A1992HD62800014 PM 1531278 ER PT J AU PAREDES, AM SIMON, MN BROWN, DT AF PAREDES, AM SIMON, MN BROWN, DT TI THE MASS OF THE SINDBIS VIRUS NUCLEOCAPSID SUGGESTS IT HAS T = 4 ICOSAHEDRAL SYMMETRY SO VIROLOGY LA English DT Note ID SEMLIKI FOREST VIRUS; TRANSMISSION ELECTRON-MICROSCOPY; MATURATION-DEFECTIVE MUTANTS; VESICULAR STOMATITIS-VIRUS; FREEZE-ETCHING TECHNIQUES; MEMBRANE-PROTEINS; WILD-TYPE; ORGANIZATION; MORPHOLOGY; MORPHOGENESIS C1 UNIV TEXAS,CELL RES INST,AUSTIN,TX 78713. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. UNIV TEXAS,DEPT MICROBIOL,AUSTIN,TX 78713. FU NCRR NIH HHS [RR01777]; NIAID NIH HHS [AI14710] NR 29 TC 44 Z9 44 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 0042-6822 J9 VIROLOGY JI Virology PD MAR PY 1992 VL 187 IS 1 BP 329 EP 332 DI 10.1016/0042-6822(92)90322-G PG 4 WC Virology SC Virology GA HD628 UT WOS:A1992HD62800034 PM 1736536 ER PT J AU GARRITY, PJ WEINER, SK AF GARRITY, PJ WEINER, SK TI UNITED-STATES DEFENSE STRATEGY AFTER THE COLD-WAR SO WASHINGTON QUARTERLY LA English DT Article C1 MIT,POLIT SCI,CAMBRIDGE,MA 02139. RP GARRITY, PJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NATL SECUR STUDIES,LOS ALAMOS,NM 87544, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0163-660X J9 WASH QUART JI Wash. Q. PD SPR PY 1992 VL 15 IS 2 BP 57 EP 76 PG 20 WC International Relations; Law SC International Relations; Government & Law GA HF855 UT WOS:A1992HF85500005 ER PT J AU CHANG, LH HUNSAKER, CT DRAVES, JD AF CHANG, LH HUNSAKER, CT DRAVES, JD TI RECENT RESEARCH ON EFFECTS OF CLIMATE CHANGE ON WATER-RESOURCES SO WATER RESOURCES BULLETIN LA English DT Article DE WATER MANAGEMENT; WATER RESOURCE PLANNING; CLIMATE CHANGE; WATER POLICY; SEA LEVEL RISE; WATER USE ID LAURENTIAN GREAT-LAKES; CHANGE HYDROLOGICAL IMPACTS; ATMOSPHERIC CO2; POTENTIAL CHANGES; FRESH-WATER; RIVER BASIN; HABITAT; SYSTEMS; FISH; SENSITIVITY AB Concentrations of atmospheric CO2 and other radiatively active trace gases have risen since the Industrial Revolution. Such atmospheric modifications can alter the global climate and hydrologic cycle, in turn affecting water resources. The clear physical and biological sensitivities of water resources to climate, the indication that climate change may be occurring, and the substantial social and economic dependencies on water resources have instigated considerable research activity in the area of potential water resource impacts. We discuss how the literature on climate change and water resources responds to three basic research needs: (1) a need for water managers to clearly describe the climatic and hydrologic statistics and characteristics needed to estimate climatic impacts on water resources, (2) a need to estimate the impacts of climate change on water resources, and (3) a need to evaluate standard water management and planning methods to determine if uncertainty regarding fundamental assumptions (e.g., hydrologic stationarity) implies that these methods should be revised. The climatic and hydrologic information needs for water resource managers can be found in a number of sources. A proliferation of impact assessments use a variety of methods for generating climate scenarios, and apply both modeling approaches and historical analyses of past responses to climate fluctuations for revealing resource or system sensitivities to climate changes. Traditional techniques of water resources planning and management have been examined, yielding, for example, suggestions for new methods for incorporating climate information in real-time water management. C1 HUGHES STX,LANHAM,MD 20706. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP CHANG, LH (reprint author), OAK RIDGE ASSOCIATED UNIV,OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,MS-6036,OAK RIDGE,TN 37831, USA. OI Hunsaker, Carolyn/0000-0002-5662-2402 NR 101 TC 14 Z9 15 U1 2 U2 10 PU AMER WATER RESOURCES ASSOC PI HERNDON PA 950 HERNDON PARKWAY SUITE 300, HERNDON, VA 20170-5531 SN 0043-1370 J9 WATER RESOUR BULL JI Water Resour. Bull. PD MAR-APR PY 1992 VL 28 IS 2 BP 273 EP 286 PG 14 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA JF797 UT WOS:A1992JF79700003 ER PT J AU MURPHY, EM SCHRAMKE, JA FREDRICKSON, JK BLEDSOE, HW FRANCIS, AJ SKLAREW, DS LINEHAN, JC AF MURPHY, EM SCHRAMKE, JA FREDRICKSON, JK BLEDSOE, HW FRANCIS, AJ SKLAREW, DS LINEHAN, JC TI THE INFLUENCE OF MICROBIAL ACTIVITY AND SEDIMENTARY ORGANIC-CARBON ON THE ISOTOPE GEOCHEMISTRY OF THE MIDDENDORF AQUIFER SO WATER RESOURCES RESEARCH LA English DT Article ID DEEP SUBSURFACE SEDIMENTS; SOUTHEASTERN COASTAL-PLAIN; SAVANNAH RIVER PLANT; SOUTH-CAROLINA; FERRIC IRON; TERRESTRIAL SUBSURFACE; CRETACEOUS SEDIMENTS; GROUND-WATER; BACTERIA; REDUCTION AB Microorganisms present in deep Atlantic coastal plain sediments affect the geochemical evolution of groundwater and its chemical and isotopic composition, yet the factors controlling their origin, distribution, and diversity are poorly understood. The evolution of the groundwater chemistry, the fractionation of stable carbon isotopes, and the groundwater age are all indicators of the inorganic and microbial reactions occurring along a given flow path from groundwater recharge to groundwater discharge. In this study, tritium, C-14, and groundwater chemistry along three flow paths of the Middendorf aquifer in South Carolina were analyzed. The C-14 ranged from 89 percent modern carbon (pmC) in the recharge zone to 9.9 pmC in the distal borehole; the delta-C-13 remained relatively constant at approximately -22 parts-per-thousand, suggesting microbial oxidation of organic carbon. Carbon isotope analyses of particulate organic carbon from core sediments and groundwater chemistry were used to model the carbon chemistry; the groundwater ages obtained from C-14 ranged from modern to 11,500 years B.P. The highest frequencies of occurrence, numbers, and diversity of aerobic and anaerobic bacteria were found in boreholes near the recharge zone where the calculated ages were < 1000 years B.P. The transport of microorganisms from the recharge zone may be responsible for this distribution as well as the electron acceptors necessary to support this diverse community of bacteria. The presence of both aerobic heterotrophs and anaerobic sulfate- and iron-reducing bacteria in the core sediments suggested the occurrence of anaerobic microsites throughout this otherwise aerobic aquifer. The highest in situ microbial respiration rate, as determined by modeling, was found along a flow path near the recharge area. It is likely that the electron acceptors necessary for supporting a diverse microbial community are depleted by the time the groundwater residence time in the Middendorf aquifer exceeds several hundred years. C1 WESTINGHOUSE SAVANNAH RIVER CO, DIV ENVIRONM SCI, SAVANNAH RIVER LAB, AIKEN, SC 29802 USA. BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. RP MURPHY, EM (reprint author), PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. NR 74 TC 79 Z9 80 U1 3 U2 18 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD MAR PY 1992 VL 28 IS 3 BP 723 EP 740 DI 10.1029/91WR02678 PG 18 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA HG175 UT WOS:A1992HG17500015 ER PT J AU BEARDEN, IG JANSSENS, RVF CARPENTER, MP MOORE, EF AHMAD, I BAXTER, AM BENET, P DALY, PJ DRIGERT, MW FERNANDEZ, PB GARG, U GRABOWSKI, ZW KHOO, TL LAURITSEN, T REVIOL, W YE, D AF BEARDEN, IG JANSSENS, RVF CARPENTER, MP MOORE, EF AHMAD, I BAXTER, AM BENET, P DALY, PJ DRIGERT, MW FERNANDEZ, PB GARG, U GRABOWSKI, ZW KHOO, TL LAURITSEN, T REVIOL, W YE, D TI CHARACTERIZATION OF THE SUPERDEFORMED BAND IN HG-189 SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Note AB Much improved data on the superdeformed band in 189Hg have been obtained in the study of the Gd-160(S-34, 5n) reaction at 165 MeV. Energies of ten intraband transitions have now been determined and the decay into the yrast line has been delineated. A discussion of probable spins for the 189Hg superdeformed band raises questions, about proposed procedures for assigning spins to superdeformed states. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV NOTRE DAME,NOTRE DAME,IN 46556. AUSTRALIAN NATL UNIV,DEPT PHYS,CANBERRA,ACT 2600,AUSTRALIA. RP BEARDEN, IG (reprint author), PURDUE UNIV,W LAFAYETTE,IN 47907, USA. RI Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 10 TC 9 Z9 9 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 1992 VL 341 IS 4 BP 491 EP 492 DI 10.1007/BF01301395 PG 2 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA HK238 UT WOS:A1992HK23800016 ER PT J AU ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHAPKIN, M CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DOLL, O DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSS, E GROSSETETE, B GROSSEWIESMANN, P GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HENKES, T HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAGNUSSEN, N MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYHTIA, J RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VISHNEVSKY, N VITALE, L VLASOV, EV VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHAPKIN, M CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DOLL, O DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSS, E GROSSETETE, B GROSSEWIESMANN, P GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HENKES, T HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAGNUSSEN, N MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYHTIA, J RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VISHNEVSKY, N VITALE, L VLASOV, EV VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI STUDY OF FINAL-STATE PHOTONS IN HADRONIC Z0 DECAY AND LIMITS ON NEW PHENOMENA SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LUND MONTE-CARLO; DENSITY PROJECTION CHAMBER; JET PRODUCTION-RATES; E+ E ANNIHILATION; PERTURBATIVE QCD; Z-BOSON; FRAGMENTATION; COLLISIONS; RESONANCE; PHYSICS AB The differential cross section for final state radiation from primary quarks is obtained from a study of isolated energetic photons produced in the reaction e+ e- --> Z0 --> hadrons + gamma, as measured in the DELPHI detector at the CERN LEP collider. When combined with the measurement of the total hadronic width of the Z0, the observed rate determines the electroweak coupling constants of up and down type quarks, i.e., upsilon(1/3)2 + a(1/3)2 = 1.13 +/- 0.29 and upsilon(2/3)2 + a(2/3)2 = 1.65 +/- 0.43. No evidence is seen for additional photon production from anomalous decays of the Z0 or from decays of new particles. This measurement leads to upper limits on the production cross section times branching fraction of (a) the Higgs boson in the reaction e+ e- --> Z0 --> H +gamma, H --> hadrons, (b) an excited quark, q* --> q + gamma, and (c) the contribution of an anomalous decay of the Z0 into a photon and hadrons. These limits, all at the 95% confidence level, vary from 3 to 10 pb as the mass of the intermediate state (H, q* or Z*) varies from 10 GeV/c2 to 80 GeV/c2. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV LIBRE BRUSSELS VRIJE UNIV BRUSSEL,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,SERV PHYS PART ELEM,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. CTR RECH NUCL,DIV HAUTES ENERGIES,GRP DELPHI,F-67037 STRASBOURG,FRANCE. LEPSI,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. JOINT INST NUCL RES DUBNA,MOSCOW 101000,USSR. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV PARIS 07,LPNHE,F-75230 PARIS 05,FRANCE. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CENS,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV,USSR. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,INST FIS CORPUSCULAR,CTR MIXTO,VALENCIA,SPAIN. UNIV VALENCIA,DEPT FIS ATOM MOLEC & NUCL,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHUS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Zaitsev, Alexandre/B-8989-2017; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Varela, Joao/K-4829-2016; OI Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Zaitsev, Alexandre/0000-0002-4961-8368; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Dracos, Marcos/0000-0003-0514-193X; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; De Angelis, Alessandro/0000-0002-3288-2517; Varela, Joao/0000-0003-2613-3146; De Lotto, Barbara/0000-0003-3624-4480; Benlloch Baviera, Jose Maria/0000-0001-6073-1436; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 57 TC 29 Z9 29 U1 0 U2 10 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD MAR PY 1992 VL 53 IS 4 BP 555 EP 565 PG 11 WC Physics, Particles & Fields SC Physics GA HK237 UT WOS:A1992HK23700002 ER PT J AU ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHIAPKIN, M CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DOLL, O DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M CRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSS, E GROSSETETE, B GROSSEWIESMANN, P GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HENKES, T HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAGNUSSEN, N MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MATVEEV, M MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYHTIA, J RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, G TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O URAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VITALE, L VLASOV, EV VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLI, G ZUNIGA, J AF ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHIAPKIN, M CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DOLL, O DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M CRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSS, E GROSSETETE, B GROSSEWIESMANN, P GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HENKES, T HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAGNUSSEN, N MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MATVEEV, M MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYHTIA, J RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, G TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O URAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VITALE, L VLASOV, EV VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLI, G ZUNIGA, J TI MEASUREMENT OF THE AVERAGE LIFETIME OF B-HADRONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID E+E ANNIHILATION; MONTE-CARLO; DECAYS; FRAGMENTATION; QUARKS AB The average lifetime of B hadrons produced in hadronic Z0 decays has been measured with the DELPHI detector at LEP. The measurement is based on the analysis of the impact parameter distribution of high p(t) muons and hadrons. The resulting mean B lifetimes are tau(B) = (1.30 +/- 0.10 +/- 0.08) ps and tau(B) = (1.27 +/- 0.04 +/- 0.12) ps respectively, giving a combined value of tau(B) = (1.28 +/- 0.10) ps. The hadronic sample was also used to measure the partial Z0 width GAMMA(bbBAR)/GAMMA(h) and gave a value of 0.222(-0.031)+0.033 +/- 0.017. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV LIBRE BRUSSELS VRIJE UNIV BRUSSEL,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,SERV PHYS PART CHEM,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. CTR RECH NUCL,DIV HAUTES ENERGIES,GRP DELPHI,F-67037 STRASBOURG,FRANCE. LEPSI,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. JOINT INST NUCL RES DUBNA,MOSCOW 101000,USSR. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV PARIS 07,LPNHE,F-75230 PARIS 05,FRANCE. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CENS,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV,USSR. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,INST FIS CORPUSCULAR,CTR MIXTO,VALENCIA,SPAIN. UNIV VALENCIA,DEPT FIS ATOM MOLEC & NUCL,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Zaitsev, Alexandre/B-8989-2017; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Marti-Garcia, Salvador/F-3085-2011; Varela, Joao/K-4829-2016; OI Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; De Angelis, Alessandro/0000-0002-3288-2517; Varela, Joao/0000-0003-2613-3146; De Lotto, Barbara/0000-0003-3624-4480; Benlloch Baviera, Jose Maria/0000-0001-6073-1436; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 29 TC 22 Z9 22 U1 0 U2 8 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD MAR PY 1992 VL 53 IS 4 BP 567 EP 580 PG 14 WC Physics, Particles & Fields SC Physics GA HK237 UT WOS:A1992HK23700003 ER PT J AU VAIDYA, RU FERNANDO, J CHAWLA, KK FERBER, MK AF VAIDYA, RU FERNANDO, J CHAWLA, KK FERBER, MK TI EFFECT OF FIBER COATING ON THE MECHANICAL-PROPERTIES OF A NEXTEL-480-FIBER-REINFORCED GLASS MATRIX COMPOSITE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID HIGH-TOUGHNESS CERAMICS; REINFORCED GLASS; FAILURE MECHANISMS; IMPACT BEHAVIOR; STRENGTH; PERSPECTIVE; INTERFACE; FRACTURE; CRACKING AB The effect of fiber coatings on the mechanical properties of glass matrix composites reinforced with Nextel 480 fiber was investigated. Two different fiber coatings, namely tin dioxide and boron nitride, were investigated. The presence of the coatings on the fiber led to an improvement in mechanical behavior. In particular, the boron nitride coating improved the total work of fracture of the composite without reducing the strength. A marked difference was observed in the fracto-graphic features between the uncoated and tin-dioxide-coated samples as compared to the boron-nitride-coated samples. The uncoated and tin-dioxide-coated fiber composites failed in a brittle fashion, without any fiber pull-out, whereas the boron-nitride-coated fiber samples exhibited extensive fiber pull-out. This improvement in the toughness or energy absorbed during the fracture process was attributed to the relatively weak bonding between the fiber and matrix, induced as a result of the coating. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37830. RP VAIDYA, RU (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801, USA. NR 29 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD FEB 29 PY 1992 VL 150 IS 2 BP 161 EP 169 DI 10.1016/0921-5093(92)90108-D PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA HK289 UT WOS:A1992HK28900002 ER PT J AU GOLDBERG, A RUANO, OA SHERBY, OD AF GOLDBERG, A RUANO, OA SHERBY, OD TI DEVELOPMENT OF ULTRAFINE MICROSTRUCTURES AND SUPERPLASTICITY IN HADFIELD MANGANESE STEELS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB Ultrafine grains were developed in Hadfield manganese steels through appropriate thermomechanical processing. The steels contained from 1.2 to 1.7 wt.% C and 12.3-16.3 wt.% Mn. The austenite grains. 2-8-mu-m in size, were stabilized against grain growth by a dispersion of fine carbides, typically less than 1-mu-m. The processed materials were evaluated for superplastic properties at elevated temperatures (750-900-degrees-C). Values for the strain rate sensitivity exponent m in the expression sigma = k-epsilon(m) ranged from 0.37 to 0.65. The value of m in the superplastic regime was found to depend on composition, grain size and temperature. At 23-degrees-C, the fine-grain steels showed higher yield strengths and hardness values, but lower ductility, relative to values reported for commercially processed materials. C1 CSIC,CTR NACL INVEST MET,E-28040 MADRID,SPAIN. STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. RP GOLDBERG, A (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV ENGN SCI,LIVERMORE,CA 94550, USA. RI Ruano, Oscar/H-1835-2015 OI Ruano, Oscar/0000-0001-6368-986X NR 10 TC 12 Z9 12 U1 2 U2 2 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 29 PY 1992 VL 150 IS 2 BP 187 EP 194 DI 10.1016/0921-5093(92)90111-D PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA HK289 UT WOS:A1992HK28900005 ER PT J AU BINER, SB SPITZIG, WA AF BINER, SB SPITZIG, WA TI CREEP CHARACTERISTICS OF WIRE-DRAWN CU-20-PERCENT-NB SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID HIGH-TEMPERATURE CREEP; POWER-LAW CREEP; GRAIN-BOUNDARY; COMPOSITES; ALLOYS; STRESS AB In this study the creep deformation and rupture characteristics of a wire-drawn Cu-20%Nb composite are investigated at 500-degrees-C and compared with the results obtained from pure copper. The results show that the creep rupture strength of Cu-20%Nb is considerably higher than that for pure copper. The rupture strength of Cu-20%Nb increases up to a certain draw ratio, in contrast to the room temperature strengthening. The stress exponents n are in the range 6.6-8.1 for Cu-20%Nb, in comparison with 2.75 in pure copper. The increase in the creep strength and the higher stress exponent values in the Cu-20%Nb are associated with the reduction in the power law creep damage mechanism. This is due to the constraint introduced on the matrix creep flow by the niobium phase rather than the development of high threshold stress values. While the increase in the length of niobium filaments and reduction in interfilament spacing with increasing draw ratio increase the constraint on the creep flow of the matrix, they also enhance the creep damage caused by the diffusion mechanisms because of the easy diffusion paths along the niobium filaments and the reduction in the matrix grain size. RP BINER, SB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 21 TC 10 Z9 10 U1 1 U2 3 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 29 PY 1992 VL 150 IS 2 BP 213 EP 220 DI 10.1016/0921-5093(92)90114-G PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA HK289 UT WOS:A1992HK28900008 ER PT J AU KRESIN, VZ WOLF, SA DEUTSCHER, G AF KRESIN, VZ WOLF, SA DEUTSCHER, G TI CORRELATION BETWEEN MICROSTRUCTURE AND PROPERTIES OF HIGH-TC FILMS - APPLICATION TO MICROWAVE PROPERTIES SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP ON SOLID STATE IONICS AT THE INTERNATIONAL CONF ON ADVANCED MATERIALS CY MAY 27-31, 1991 CL STRASBOURG, FRANCE ID ENERGY-GAP; TRANSITION-TEMPERATURE; SUPERCONDUCTING STATE; OXIDE SUPERCONDUCTORS; YBA2CU3O7; CONDUCTIVITY; PARAMETERS; CRYSTAL AB The Y-Ba-Cu-O compound contains two conductive subsystems and as a result displays a two-gap structure. Oxygen ordering affects the value of the smaller gap. Charge transfer leads to an induced superconducting state in the chains. The short coherence length, anisotropy and the presence of different structural units lead to peculiar microwave properties of high T(c) films. In this paper the authors describe their approach to the theory of high T(c) films and then focus on the microwave properties of the films. C1 USN,RES LAB,WASHINGTON,DC 20375. TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 37 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD FEB 29 PY 1992 VL 12 IS 4 BP 365 EP 368 DI 10.1016/0921-5107(92)90007-V PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HJ206 UT WOS:A1992HJ20600007 ER PT J AU VONWEIZSACKER, E STRATHMANN, MP SIMON, MI AF VONWEIZSACKER, E STRATHMANN, MP SIMON, MI TI DIVERSITY AMONG THE BETA SUBUNITS OF HETEROTRIMERIC GTP-BINDING PROTEINS - CHARACTERIZATION OF A NOVEL BETA-SUBUNIT CDNA SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID GAMMA-SUBUNITS; REGULATORY PROTEINS; MOLECULAR-CLONING; ALPHA-SUBUNITS; SHOWS HOMOLOGY; GENE; TRANSDUCIN; AMPLIFICATION; CEREVISIAE; SEQUENCES C1 CALTECH,DIV BIOL,147-75,PASADENA,CA 91125. UNIV COLOGNE,INST ENTWICKLUNGSBIOL,W-5000 COLOGNE 41,GERMANY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,HUMAN GENOME LAB,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM34236] NR 29 TC 88 Z9 89 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 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD FEB 28 PY 1992 VL 183 IS 1 BP 350 EP 356 DI 10.1016/0006-291X(92)91650-F PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HG438 UT WOS:A1992HG43800052 PM 1543505 ER PT J AU BLAIR, P WILKINSON, JE GODFREY, VL AF BLAIR, P WILKINSON, JE GODFREY, VL TI FATAL LYMPHORETICULAR DISEASE IS ESTABLISHED EARLY IN THYMIC DEVELOPMENT IN THE SCURFY (SF) MOUSE SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37901. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1700 EP A1700 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27100582 ER PT J AU TSENG, HC KAUR, S MALTBY, DA LIANG, W BURLINGAME, AL ROTHMAN, SS AF TSENG, HC KAUR, S MALTBY, DA LIANG, W BURLINGAME, AL ROTHMAN, SS TI CHARACTERIZATION OF PROTEINS IN PANCREATIC-SECRETION AND ZYMOGEN GRANULES FROM THE SAME RAT BY MASS-SPECTROMETRY SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT PHYSIOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT STOMATOL,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1743 EP A1743 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27100831 ER PT J AU WILSON, LL LETTENMAIER, DP SKYLLINGSTAD, E AF WILSON, LL LETTENMAIER, DP SKYLLINGSTAD, E TI A HIERARCHICAL STOCHASTIC-MODEL OF LARGE-SCALE ATMOSPHERIC CIRCULATION PATTERNS AND MULTIPLE STATION DAILY PRECIPITATION SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID POINT PROCESS MODELS; EASTERN NORTH-AMERICA; PRINCIPAL COMPONENTS; SIMILAR METEOROLOGY; CLUSTER-ANALYSIS; DEFINE PERIODS; RAINFALL; CHEMISTRY; SETS AB A stochastic model of weather states and concurrent daily precipitation at multiple precipitation stations is described. Four algorithms are investigated for classification of daily weather states: k-means clustering, fuzzy clustering, principal components, and principal components coupled with k-means clustering. A semi-Markov model with a geometric distribution for within-class lengths of stay is used to describe the evolution of weather classes. A hierarchical modified Polya urn model is used to simulate precipitation conditioned on the regional weather type. An information measure that considers both the probability of weather class occurrence and conditional precipitation probabilities is developed to quantify the extent to which each of the weather classification schemes discriminates the precipitation states (rain-no rain) at the precipitation stations. Evaluation of the four algorithms using the information measure shows that all methods performed equally well. The principal components method is chosen due to its ability to incorporate information from larger spatial fields. Precipitation amount distributions are assumed to be drawn from spatially correlated mixed exponential distributions, whose parameters varied by season and weather class. The model is implemented using National Meterological Center historical atmospheric observations for the period 1964-1988 mapped to 5-degrees x 5-degrees grid cells over the eastern North Pacific, and three precipitation stations west of the Cascade mountain range in the state of Washington. Comparison of simulated weather class-station precipitation time series with observational data shows that the model preserved weather class statistics and mean daily precipitation quite well, especially for stations highest in the hierarchy. Precipitation amounts for the lowest precipitation station in the hierarchy, and for precipitation extremes, are not as well preserved. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP WILSON, LL (reprint author), UNIV WASHINGTON, DEPT CIVIL ENGN, FX-10, SEATTLE, WA 98195 USA. RI lettenmaier, dennis/F-8780-2011 OI lettenmaier, dennis/0000-0003-3317-1327 NR 61 TC 78 Z9 82 U1 1 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 28 PY 1992 VL 97 IS D3 BP 2791 EP 2809 PG 19 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HG561 UT WOS:A1992HG56100012 ER PT J AU HEUER, AH FINK, DJ LARAIA, VJ ARIAS, JL CALVERT, PD KENDALL, K MESSING, GL BLACKWELL, J RIEKE, PC THOMPSON, DH WHEELER, AP VEIS, A CAPLAN, AI AF HEUER, AH FINK, DJ LARAIA, VJ ARIAS, JL CALVERT, PD KENDALL, K MESSING, GL BLACKWELL, J RIEKE, PC THOMPSON, DH WHEELER, AP VEIS, A CAPLAN, AI TI INNOVATIVE MATERIALS PROCESSING STRATEGIES - A BIOMIMETIC APPROACH SO SCIENCE LA English DT Article ID BONE; CDS; VESICLES; MATRIX; CRYSTALLIZATION; PROTEINS; CEMENT; FILMS; MODEL AB Many organisms construct structural ceramic (biomineral) composites from seemingly mundane materials; cell-mediated processes control both the nucleation and growth of mineral and the development of composite microarchitecture. Living systems fabricate biocomposites by: (i) confining biomineralization within specific subunit compartments; (ii) producing a specific mineral with defined crystal size and orientation; and (iii) packaging many incremental units together in a moving front process to form fully densified, macroscopic structures. By adapting biological principles, materials scientists are attempting to produce novel materials. To date, neither the elegance of the biomineral assembly mechanisms nor the intricate composite microarchitectures have been duplicated by nonbiological processing. However, substantial progress has been made in the understanding of how biomineralization occurs, and the first steps are now being taken to exploit the basic principles involved. C1 COLLATEK INC, COLUMBUS, OH 43201 USA. THREE M CO, DIV IND MINERALS, ST PAUL, MN 55144 USA. UNIV CHILE, FAC VET SCI, SANTIAGO, CHILE. UNIV ARIZONA, DEPT MAT SCI & ENGN, TUCSON, AZ 85721 USA. ICI ADV MAT, CHESHIRE WA7 4QE, ENGLAND. PENN STATE UNIV, DEPT MAT SCI & ENGN, UNIVERSITY PK, PA 16802 USA. CASE WESTERN RESERVE UNIV, DEPT MACROMOLEC SCI, CLEVELAND, OH 44106 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. OREGON GRAD INST, BEAVERTON, OR 97006 USA. CLEMSON UNIV, DEPT BIOL SCI, CLEMSON, SC 29631 USA. NORTHWESTERN UNIV, SCH DENT, CHICAGO, IL 60611 USA. CASE WESTERN RESERVE UNIV, DEPT BIOL, CLEVELAND, OH 44106 USA. RP HEUER, AH (reprint author), CASE WESTERN RESERVE UNIV, DEPT MAT SCI & ENGN, CLEVELAND, OH 44106 USA. RI Arias, Jose/E-1206-2011 NR 76 TC 452 Z9 477 U1 8 U2 124 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 28 PY 1992 VL 255 IS 5048 BP 1098 EP 1105 DI 10.1126/science.1546311 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HF632 UT WOS:A1992HF63200034 PM 1546311 ER PT J AU WOLINSKY, SM WIKE, CM KORBER, BTM HUTTO, C PARKS, WP ROSENBLUM, LL KUNSTMAN, KJ FURTADO, MR MUNOZ, JL AF WOLINSKY, SM WIKE, CM KORBER, BTM HUTTO, C PARKS, WP ROSENBLUM, LL KUNSTMAN, KJ FURTADO, MR MUNOZ, JL TI SELECTIVE TRANSMISSION OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 VARIANTS FROM MOTHERS TO INFANTS SO SCIENCE LA English DT Article ID REVERSE-TRANSCRIPTASE; RECEPTOR-BINDING; CD4 RECEPTOR; AMINO-ACIDS; NEUTRALIZATION; HIV; ANTIBODIES; ENVELOPE; SEQUENCE; CHIMPANZEES AB Multiple human immunodeficiency virus type-1 sequences from the V3 and V4-V5 regions of the envelope gene were analyzed from three mother-infant pairs. The infants' viral sequences were less diverse than those of their mothers. In two pairs, a proviral form infrequently found in the mother predominated in her infant. A conserved N-linked glycosylation site within the V3 region present in each mother's sequence set, was absent in all of the infants' sequence sets. These findings demonstrate that a minor subset of maternal virus is transmitted to the infant. C1 NYU,SCH MED,DEPT PEDIAT,NEW YORK,NY 10016. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV MIAMI,SCH MED,DEPT PEDIAT,MIAMI,FL 33136. RP WOLINSKY, SM (reprint author), NORTHWESTERN UNIV,SCH MED,DEPT MED,CHICAGO,IL 60611, USA. RI Wolinsky, Steven/B-2893-2012; OI Wolinsky, Steven/0000-0002-9625-6697; Korber, Bette/0000-0002-2026-5757 FU NIAID NIH HHS [AI-32535]; NICHD NIH HHS [HD26619-01]; PHS HHS [P01-25569] NR 50 TC 511 Z9 512 U1 0 U2 6 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 28 PY 1992 VL 255 IS 5048 BP 1134 EP 1137 DI 10.1126/science.1546316 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HF632 UT WOS:A1992HF63200044 PM 1546316 ER PT J AU DOVER, CB GUTSCHE, T FAESSLER, A MAU, RV AF DOVER, CB GUTSCHE, T FAESSLER, A MAU, RV TI PRODUCTION OF QQBARG HYBRID MESONS IN NBARN ANNIHILATION SO PHYSICS LETTERS B LA English DT Article ID PBARP ANNIHILATION; QUARK-MODEL; STATES; REST; ETA AB In a microscopic model with constituent quarks Q and gluons g, we have estimated the branching ratios for the formation of QQBARg hybrid mesons in antinucleon-nucleon (NBARN) annihilation reactions. We find that the measured production rate of the E(1420) meson observed in the reaction ppBAR --> pi+pi--E at rest is much larger than that which we obtain under the assumption that the E is the 0-+ member of the QQBARg multiplet formed by coupling a S-3(1) QQBAR pair to a transverse electric (TE) gluon normal mode. For the exotic 1-+(1-) member-rho of this multiplet, we predict a larger production rate, at observable levels, for NBARN (S-11(0)) --> pi + rho. C1 UNIV TUBINGEN,INST THEORET PHYS,W-7400 TUBINGEN 1,GERMANY. INST PHYS NUCL,DIV THEORET PHYS,F-91406 ORSAY,FRANCE. UNIV PARIS 06,PHYS THEOR PARTICULES ELEMENTAIRES LAB,F-75230 PARIS 05,FRANCE. RP DOVER, CB (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 27 TC 5 Z9 5 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 27 PY 1992 VL 277 IS 1-2 BP 23 EP 26 DI 10.1016/0370-2693(92)90950-9 PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HK189 UT WOS:A1992HK18900005 ER PT J AU KING, SF SUZUKI, M AF KING, SF SUZUKI, M TI COMMENT ON CRITICAL INSTABILITY SO PHYSICS LETTERS B LA English DT Article ID ELECTROWEAK SYMMETRY-BREAKING; QUARK CONDENSATE; BOSONS; MODEL AB We discuss the problem of the mass splitting between top and bottom quarks, within the context of Nambu-Jona-Lasinio type models involving top and bottom quark condensates. We interpret the phenomenon of "critical instability" recently proposed to account for such a mass splitting as the fine-tuning of two vacuum expectation values in a composite two-Higgs doublet model. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KING, SF (reprint author), UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. NR 13 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD FEB 27 PY 1992 VL 277 IS 1-2 BP 153 EP 157 DI 10.1016/0370-2693(92)90972-7 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HK189 UT WOS:A1992HK18900027 ER PT J AU BABUSCI, D BELLUCCI, S GIORDANO, G MATONE, G SANDORFI, AM MOINESTER, MA AF BABUSCI, D BELLUCCI, S GIORDANO, G MATONE, G SANDORFI, AM MOINESTER, MA TI CHIRAL SYMMETRY AND PION POLARIZABILITIES SO PHYSICS LETTERS B LA English DT Article ID COMPTON-SCATTERING; QUARK AB We use chiral perturbation theory including one-loop contribution to derive formulae needed to deduce pion polarizabilities for gamma-pi --> gamma-pi and gamma-gamma --> pi-pi data. We deduce for the first time values for the pi+/- and pi-0 polarizabilities from pi-pi production data, and compare these new results to chiral symmetry predictions. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP BABUSCI, D (reprint author), IST NAZL FIS NUCL,LAB NAZL FRASCATI,POB 13,I-00044 FRASCATI,ITALY. RI Bellucci, Stefano/C-9235-2011 NR 35 TC 62 Z9 63 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 27 PY 1992 VL 277 IS 1-2 BP 158 EP 162 DI 10.1016/0370-2693(92)90973-8 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HK189 UT WOS:A1992HK18900028 ER PT J AU FAY, SP YOSHIDA, TM POSNER, RG HABBERSETT, R DOMALEWSKI, MD FREER, RJ PIERSON, E WHITAKER, J HAUGLAND, RP MAGDE, D SKLAR, LA AF FAY, SP YOSHIDA, TM POSNER, RG HABBERSETT, R DOMALEWSKI, MD FREER, RJ PIERSON, E WHITAKER, J HAUGLAND, RP MAGDE, D SKLAR, LA TI HUMAN NEUTROPHIL FORMYL PEPTIDE RECEPTOR-LIGAND INTERACTION INVOLVES A BINDING POCKET PROTONATION SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV NEW MEXICO,SCH MED,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ALAMOS SCI LAB,NATL FLOW CYTOMETRY RESOURCE,LOS ALAMOS,NM 87545. VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,RICHMOND,VA 23298. MOLEC PROBES,EUGENE,OR 97402. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92037. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1010 EP A1010 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71900432 ER PT J AU GALLOWAY, PJ COOK, JS AF GALLOWAY, PJ COOK, JS TI EPIDERMAL GROWTH-FACTOR AND GLUCOSE-TRANSPORT DEVELOPMENT IN THE OPOSSUM KIDNEY-CELL LINE, OK SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,KNOXVILLE,TN 37996. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1351 EP A1351 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902401 ER PT J AU GONCZ, KK LIN, W ROTHMAN, SS AF GONCZ, KK LIN, W ROTHMAN, SS TI THE PERMEABILITY PROPERTIES OF THE ZYMOGEN GRANULE MEMBRANE TO ITS ENCLOSED PROTEINS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1485 EP A1485 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71903176 ER PT J AU HAUSER, MR CAMPION, SR MATSUNAMI, R ENGLER, DA NIYOGI, SK COOK, JS AF HAUSER, MR CAMPION, SR MATSUNAMI, R ENGLER, DA NIYOGI, SK COOK, JS TI VARIANTS OF HUMAN EPIDERMAL GROWTH-FACTOR STIMULATE RAPID PHOSPHORYLATION OF LIPOCORTIN-1 IN PERMEABILIZED MURINE EPIDERMAL-KERATINOCYTES SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV TENNESSEE,OAK RIDGE NATL LAB,GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1351 EP A1351 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902399 ER PT J AU KIM, SH PRIVE, GG MILBURN, MV AF KIM, SH PRIVE, GG MILBURN, MV TI PIVOT HYPOTHESIS - A MECHANISM OF SIGNAL TRANSDUCTION IN A BACTERIAL TRANSMEMBRANE RECEPTOR SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Prive, Gilbert/A-3039-2008 NR 2 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1296 EP A1296 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902080 ER PT J AU LIBURDY, RP AF LIBURDY, RP TI INTRACELLULAR CALCIUM DURING SIGNAL TRANSDUCTION IN THE LYMPHOCYTE IS ALTERED BY ELF MAGNETIC AND ELECTRIC-FIELDS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BIOELECTROMAGNET RES FACIL,BERKELEY,CA 94720. NR 4 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1356 EP A1356 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902433 ER PT J AU MALONE, B LEE, TC AF MALONE, B LEE, TC TI BIOSYNTHESIS OF ETHER-CONTAINING INOSITOL PHOSPHOLIPIDS INVITRO SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A968 EP A968 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71900183 ER PT J AU MAZARIEGOS, M KOTLER, D MA, J WANG, J BURASTERO, S THORNTON, J LEONARD, E PILLA, A PINTO, C YASUMURA, S PIERSON, RN AF MAZARIEGOS, M KOTLER, D MA, J WANG, J BURASTERO, S THORNTON, J LEONARD, E PILLA, A PINTO, C YASUMURA, S PIERSON, RN TI MULTIFREQUENCY BIOIMPEDANCE ANALYSIS (MFBIA) TO ESTIMATE TOTAL-BODY WATER (TBW) AND EXTRACELLULAR WATER (ECW) IN PATIENTS WITH AIDS SO FASEB JOURNAL LA English DT Meeting Abstract C1 COLUMBIA UNIV,ST LUKES ROOSEVELT HOSP,NEW YORK,NY 10027. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1325 EP A1325 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902248 ER PT J AU UEMURA, Y LEE, TC SNYDER, F AF UEMURA, Y LEE, TC SNYDER, F TI A NOVEL COA-INDEPENDENT TRANSACETYLASE PRODUCES THE ETHANOLAMINE PLASMALOGEN ANALOG OF PLATELET-ACTIVATING-FACTOR (PAF) FROM PAF AND LYSOPLASMALOGENS IN HL-60 CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1315 EP A1315 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902191 ER PT J AU WILKINSON, JE WOYCHIK, R GODFREY, VL MOYER, J AF WILKINSON, JE WOYCHIK, R GODFREY, VL MOYER, J TI THE TG-737 MOUSE - AN ANIMAL-MODEL OF AUTOSOMAL RECESSIVE POLYCYSTIC KIDNEY-DISEASE SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV TENNESSEE,KNOXVILLE,TN 37901. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 0 TC 3 Z9 3 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1348 EP A1348 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902386 ER PT J AU BARKIGIA, KM CHANG, CK FAJER, J RENNER, MW AF BARKIGIA, KM CHANG, CK FAJER, J RENNER, MW TI MODELS OF HEME-D1 - MOLECULAR-STRUCTURE AND NMR CHARACTERIZATION OF AN IRON(III) DIOXOISOBACTERIOCHLORIN (PORPHYRINDIONE) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID DISSIMILATORY NITRITE REDUCTASE; PI-CATION RADICALS; SIROHYDROCHLORIN RING-SYSTEM; PHOSPHATE-SULFITE REDUCTASE; PROSTHETIC GROUP; FREE-BASE; ESCHERICHIA-COLI; IRON(II,III)-ISOBACTERIOCHLORIN COMPLEXES; PHOTOSYNTHETIC CHROMOPHORES; ELECTROCHEMICAL PROPERTIES AB Crystallographic and NMR results are reported for 4, the ClFeIII complex of 2,7-dioxo-3,3',8,8',12,13,17,18-octaethylporphyrin (3). 4 serves as a model for heme d1, the unusual dioxoisobacteriochlorin (iBC = isobacteriochlorin) prosthetic group of bacterial dissimilatory nitrite reductases. The coordination and displacement of the Fe in 4 are similar to those found in pentacoordinate, high-spin iron(III) porphyrins, as is the domed conformation of its macrocycle. The major differences are the distinct elongation of the Fe-N distances to the saturated pyrroline rings, 2.118 (6) and 2.113 (6) angstrom, vs those to the pyrrole rings, 2.047 (6) and 2.033 (6) angstrom. The shorter C-alpha-C-beta pyrroline bonds bearing the keto groups vs those without the oxygens suggest that the keto groups are in conjugation with the macrocycle pi-system. These structural data thus provide a rationale for the most distinctive feature between iBCs and dioxo-iBCs: the large differences in Fe and macrocycle redox potentials. In contrast to the influence of the keto groups on the redox and pyrroline structural properties of 4, NMR data, particularly at the meso positions, are comparable to those recently reported for ClFeIIIOEiBC (Sullivan et al. J. Am. Chem. Soc. 1991, 113, 5264). Iterative extended Huckel calculations for the HOMOs and LUMOs of 4 correctly predict the effects of the keto groups on the redox properties of the macrocycle. Crystallographic results for the free base 3, although at poorer precision than for 4, indicate that the NH protons are localized on adjacent pyrrole rings and that the macrocycle is not inherently ruffled to any significant extent. Crystallographic data for 4: space group P1BAR, a = 11.635 (3) angstrom, b = 16.189 (5) angstrom, c = 9.003 (5) angstrom, alpha = 96.93 (3)-degrees, beta = 95.92 (3)-degrees, gamma = 93.75 (2)-degrees, V = 1669.2 angstrom 3, Z = 2. The structure was refined against 2421 data points with F(o) > 2-sigma-F(o) to R(F) = 0.065 and R(wF) = 0.064. C1 MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824. RP BARKIGIA, KM (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. RI Chang, Chi/B-1675-2010 OI Chang, Chi/0000-0002-4113-1950 NR 68 TC 36 Z9 38 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD FEB 26 PY 1992 VL 114 IS 5 BP 1701 EP 1707 DI 10.1021/ja00031a025 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA HF639 UT WOS:A1992HF63900025 ER PT J AU RAMAKRISHNA, NVS CAVALIERI, EL ROGAN, EG DOLNIKOWSKI, G CERNY, RL GROSS, ML JEONG, H JANKOWIAK, R SMALL, GJ AF RAMAKRISHNA, NVS CAVALIERI, EL ROGAN, EG DOLNIKOWSKI, G CERNY, RL GROSS, ML JEONG, H JANKOWIAK, R SMALL, GJ TI SYNTHESIS AND STRUCTURE DETERMINATION OF THE ADDUCTS OF THE POTENT CARCINOGEN 7,12-DIMETHYLBENZ[A]ANTHRACENE AND DEOXYRIBONUCLEOSIDES FORMED BY ELECTROCHEMICAL OXIDATION - MODELS FOR METABOLIC-ACTIVATION BY ONE-ELECTRON OXIDATION SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID TUMOR-INITIATING ACTIVITY; AROMATIC HYDROCARBON CARCINOGENESIS; HORSERADISH-PEROXIDASE; RADICAL CATIONS; CHEMICAL CARCINOGENESIS; NUCLEOSIDE ADDUCTS; CATALYZED BINDING; MASS-SPECTROMETRY; SENCAR MICE; CYTOCHROME-P-450 AB Anodic oxidation of 7,12-dimethylbenz[a]anthracene (7,12-DMBA) in the presence of dG yields four adducts and one oxygenated derivative of 7,12-DMBA: 7-methylbenz[a]anthracene (MBA)-12-CH2-C8dG (13%), 7-MBA-12-CH2-N7Gua (55%),12-MBA-7-CH2-N7Gua(12%), 7-MBA-12-CH2-C8Gua(10%), and 7,12-(CH2OH)2-BA(10%). The first three are primary products of the electrochemical reaction, whereas the last two are secondary products. Binding occurs predominantly at the 12-CH3 group of 7,12-DMBA and specifically to the N-7 and C-8 of Gua. On the other hand, anodic oxidation of 7,12-DMBA in the presence of dA gives only two detectable adducts: 7-MBA-12-CH2-N7Ade (45%) and 12-MBA-7-CH2-N3Ade (55%). Binding at the 12-CH3 group is specific for the N-7 of Ade, whereas the 7-CH3 group of 7,12-DMBA is specific for the N-3 of Ade. Structures of the adducts were elucidated by NMR and fast atom bombardment tandem mass spectrometry (FAB MS/MS). The adducts were also investigated by fluorescence line narrowing spectroscopy (FLNS). Both the FAB MS/MS and FLNS techniques can be used to distinguish between the adducts formed at the 7-CH3 and 12-CH3 groups of 7,12-DMBA (i.e., between 7-MBA- 1 2-CH2-N7Gua and 12-MBA-7-CH2-N7Gua and between 7-MBA-12-CH2-N7Gua and 7-MBA-12-CH2-C8Gua). FLNS can distinguish 12-MBA-7-CH2-N3Ade from 7-MBA-12-CH2-N7Ade. On the other hand, the distinction between 7-MBA-12-CH2-C8Gua and 7-MBA-12-CH2-C8dG is straight forward by FAB MS but very difficult by FLNS. The electrochemical synthesis not only provides a demonstration of the specific reactivity of nucleosides and 7,12-DMBA under oxidizing conditions but is also a source of the necessary reference materials for studying the 7,12-DMBA-DNA adducts formed in biological systems. Furthermore, the analytical methodology is now appropriate for supporting in vivo studies of 7,12-DMBA-DNA adducts. A mechanism is proposed, although there are not sufficient data to prove it. C1 UNIV NEBRASKA,MED CTR,EPPLEY INST RES CANC,600 S 42ND ST,OMAHA,NE 68198. UNIV NEBRASKA,DEPT CHEM,MIDWEST CTR MASS SPECT,LINCOLN,NE 68588. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. OI Dolnikowski, Gregory/0000-0001-5886-2656 NR 52 TC 50 Z9 50 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 26 PY 1992 VL 114 IS 5 BP 1863 EP 1874 DI 10.1021/ja00031a047 PG 12 WC Chemistry, Multidisciplinary SC Chemistry GA HF639 UT WOS:A1992HF63900047 ER PT J AU SHIOTA, S VONWRONSKI, MA TANO, K BIGNER, DD BRENT, TP MITRA, S AF SHIOTA, S VONWRONSKI, MA TANO, K BIGNER, DD BRENT, TP MITRA, S TI CHARACTERIZATION OF CDNA-ENCODING MOUSE DNA-REPAIR PROTEIN O6-METHYLGUANINE DNA METHYLTRANSFERASE AND HIGH-LEVEL EXPRESSION OF THE WILD-TYPE AND MUTANT PROTEINS IN ESCHERICHIA-COLI SO BIOCHEMISTRY LA English DT Article ID O-6-ALKYLGUANINE-DNA ALKYLTRANSFERASE; O-6-METHYLGUANINE-DNA METHYLTRANSFERASE; ALKYLATING-AGENTS; ADA PROTEIN; GENE; SEQUENCE; CLONING; CELLS; MUTAGENESIS; ENZYME AB A mouse cDNA clone encoding O6-methylguanine-DNA methyltransferase (MGMT), responsible for repair of mutagenic O6-alkylguanine in DNA, was cloned from a lambda-gt11 library. On the basis of an open reading frame in cDNA, the mouse protein contains 211 amino acids with a molecular mass of 22 kDa. The size and the predicted N-terminal sequence of the mouse protein were confirmed experimentally. The deduced amino acid sequence of the mouse MGMT is 70% homologous to that of the human MGMT. Cysteine-149 was shown to be the only alkyl acceptor residue in the mouse protein, in confirmation of the prediction based on conserved sequences of different MGMTs. Mouse MGMT protein is recognized by some monoclonal antibodies specific for human MGMT. Site-directed mutagenesis was utilized to reclone the mouse cDNA in a T7 promoter-based vector for overexpression of the native repair protein in Escherichia coli. The mouse protein has a tetrapeptide sequence, Pro-Glu-Gly-Val at positions 56-59, absent in the human protein. Neither deletion of this tetrapeptide nor substitution of valine-169 with alanine affected the activity of the mutant proteins. C1 OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, OAK RIDGE GRAD SCH BIOMED SCI, OAK RIDGE, TN 37830 USA. ST JUDE CHILDRENS RES HOSP, DEPT PHARMACOL, MEMPHIS, TN 38101 USA. DUKE UNIV, MED CTR, DEPT PATHOL, DURHAM, NC 27710 USA. FU NCI NIH HHS [CA 31721, CA 11898]; NINDS NIH HHS [NS 20023] NR 45 TC 28 Z9 29 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 1897 EP 1903 DI 10.1021/bi00122a001 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700001 PM 1371399 ER PT J AU HARPEL, MR LARIMER, FW LEE, EH MURAL, RJ SOPER, TS HARTMAN, FC AF HARPEL, MR LARIMER, FW LEE, EH MURAL, RJ SOPER, TS HARTMAN, FC TI FUNCTIONAL-SIGNIFICANCE OF INTERSUBUNIT ELECTROSTATIC INTERACTIONS AT THE ACTIVE-SITE OF R-RUBRUM RIBULOSE-BISPHOSPHATE (RUBP) CARBOXYLASE OXYGENASE SO BIOCHEMISTRY LA English DT Meeting Abstract ID RESOLUTION C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 2189 EP 2189 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700047 ER PT J AU MILBURN, MV PRIVE, GG SCOTT, WG MILLIGAN, DL YEH, J JANCARIK, J KOSHLAND, DE KIM, SH AF MILBURN, MV PRIVE, GG SCOTT, WG MILLIGAN, DL YEH, J JANCARIK, J KOSHLAND, DE KIM, SH TI STRUCTURAL-CHANGES IN A TRANSMEMBRANE RECEPTOR - CRYSTAL-STRUCTURES OF THE LIGAND DOMAIN OF ASPARTATE CHEMOTAXIS RECEPTOR WITH AND WITHOUT ASPARTATE SO BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Prive, Gilbert/A-3039-2008 NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 2192 EP 2192 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700064 ER PT J AU HIMMELSBACH, MM TAYLOR, RT DROEGE, MW AF HIMMELSBACH, MM TAYLOR, RT DROEGE, MW TI SUBUNIT ISOLATION FOR ACTIVE-SITE IDENTIFICATION OF METHYLOSINUS-TRICHOSPORIUM OB3B SOLUBLE METHANE MONOOXYGENASE SO BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. 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 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 2194 EP 2194 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700075 ER PT J AU HARPEL, MR HARTMAN, FC AF HARPEL, MR HARTMAN, FC TI ENGINEERING AN IMPROVED CO2/O2 SPECIFICITY FOR R-RUBRUM RIBULOSE-BISPHOSPHATE (RUBP) CARBOXYLASE OXYGENASE SO BIOCHEMISTRY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. 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 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 2197 EP 2197 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700091 ER PT J AU SPANGLER, BD HEERZE, LD ARMSTRONG, GD AF SPANGLER, BD HEERZE, LD ARMSTRONG, GD TI ENHANCED HYDROPHOBIC BINDING OF PERTUSSIS TOXIN IN THE PRESENCE OF OLIGOSACCHARIDE RECEPTOR ANALOGS SO BIOCHEMISTRY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. UNIV ALBERTA,DEPT MED MICROBIOL & INFECT DIS,EDMONTON T6G 2H7,ALBERTA,CANADA. 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 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 2199 EP 2199 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700105 ER PT J AU SELTZER, S AF SELTZER, S TI SOLVENT ISOTOPE EFFECTS ON RETINAL CIS TRANS ISOMERIZATION IN THE DARK-ADAPTATION OF BACTERIORHODOPSIN SO BIOCHEMISTRY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 25 PY 1992 VL 31 IS 7 BP 2205 EP 2205 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF267 UT WOS:A1992HF26700135 ER PT J AU BENTJEN, SB NELSON, DA TARASEVICH, BJ RIEKE, PC AF BENTJEN, SB NELSON, DA TARASEVICH, BJ RIEKE, PC TI THE INTRODUCTION OF ALKYL, ESTER, CARBOXYLATE, AMINO, HYDROXYL, AND PHOSPHATE FUNCTIONAL-GROUPS TO THE SURFACE OF POLYETHYLENE SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID CONTACT-ANGLE; FILM; ACID; DERIVATIVES; IONIZATION; INTERFACE AB The surface of polyethylene was derivatized with ester, carboxylate, amino, hydroxyl, and phosphate functional groups. Alpha, omega-bifunctional alkanes, containing on one end a primary amine, were coupled to oxidized polyethylene through an amide linkage. Polyethylene was first oxidized with chromic acid, the carboxylate groups were converted to the acyl chloride with phosphorus pentachloride, and then reacted with a primary amine to give the covalently bound amide. The copposing ends of the bifunctional alkanes were the methyl, tertiary amine, ester, and hydroxyl groups. The ester was converted to the carboxylate by acid cleavage and the hydroxyl group converted to the phosphate by treatment first with phosphorus oxychloride and then aqueous base. Attenuated total reflection FTIR, XPS, and pH-dependent contact angle wetting were used to characterize the surfaces. The FTIR data were used to confirm the formation of the amide and to detect an undesired carboxylate/ammonium ion complex formed in the presence of trace amounts of water. XPS data were used to confirm expected changes in elemental composition and to provide quantitative estimates of the yields. Oxidation of the polyethylene introduced 5 x 10(14) carboxylate groups/cm2 in the 25 angstrom XPS sampling depth. Of these, up to 98% could be converted to the amide. The advancing contact angle data confirmed the acid/base behavior of the functional groups. C1 PACIFIC NW LAB, MAT SCI SECT, RICHLAND, WA 99352 USA. NR 18 TC 27 Z9 27 U1 1 U2 10 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0021-8995 EI 1097-4628 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD FEB 25 PY 1992 VL 44 IS 6 BP 965 EP 980 DI 10.1002/app.1992.070440605 PG 16 WC Polymer Science SC Polymer Science GA GZ893 UT WOS:A1992GZ89300005 ER PT J AU SUSZCYNSKY, DM BOROVSKY, JE GOERTZ, CK AF SUSZCYNSKY, DM BOROVSKY, JE GOERTZ, CK TI SECONDARY-ELECTRON YIELDS OF SOLAR-SYSTEM ICES SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID DUST GRAINS; CHARGED DUST; PARTICLES; EMISSION; PLASMAS; MAGNETOSPHERES; ENCOUNTER; SPACE; RING AB The secondary electron yields of H2O, CO2, NH3 (ammonia), and CH3OH (methanol) ices have been measured as a function of electron beam energy in the 2- to 30-keV energy range. The ices were produced on a liquid-nitrogen-cooled cold finger and transferred under vacuum to a scanning electron microscope where the yield measurements were made. The imaging capabilities of the scanning electron microscope provide a means of correlating the yield measurements with the morphology of the ices and are also used to monitor charging effects. The yields were determined by measuring the amplified current from a secondary electron detector and calibrating this current signal with the amplified current signal from samples of metals with known secondary electron yields. Each of the measured yields is found to decrease with an increase in energy in the 2- to 30-keV range. Estimates are given for the maximum secondary electron yield Y(max) of each ice and the energy at which this maximum yield occurs. Implications for the charging of solar system ice grains are discussed. C1 LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545. UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. NR 43 TC 21 Z9 23 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-PLANET JI J. Geophys. Res.-Planets PD FEB 25 PY 1992 VL 97 IS E2 BP 2611 EP 2619 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KU046 UT WOS:A1992KU04600001 ER PT J AU DOGGETT, NA SMITH, CL CANTOR, CR AF DOGGETT, NA SMITH, CL CANTOR, CR TI THE EFFECT OF DNA CONCENTRATION ON MOBILITY IN PULSED FIELD GEL-ELECTROPHORESIS SO NUCLEIC ACIDS RESEARCH LA English DT Article ID ACCURATE SIZE DETERMINATION; HIGH-RESOLUTION SEPARATION; HOMOGENEOUS ELECTRIC-FIELDS; MOLECULES AB The effect of DNA concentration on pulsed field gel electrophoretic mobility was studied for human genomic DNA prepared in agarose inserts at 8-800-mu-g/ml and digested to completion with Not I. An eighth of each 100-mu-l insert was used to produce DNA loads of 0.1 to 10-mu-g per lane. The mobility of single copy restriction fragments, as detected by hybridization, was largely concentration independent when DNA concentrations were 80-mu-g/ml or less. However, at DNA concentrations of 200-mu-g/ml and greater, dramatic effects of DNA concentration are evident. In the worst case, at 800-mu-g/ml, the apparent size of a DNA fragment is almost 2.5 times its true size. At constant DNA concentrations, increasing the DNA mass loads by loading larger insert slices had no further effect on DNA electrophoretic mobility, although the bands were broader for bigger insert slices. Thus, for precise and accurate sizing in pulsed field gel electrophoresis the DNA concentration in agarose inserts should not be greater than 80-mu-g/ml (10(7) diploid human cells/ml agarose insert). C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 FU NCI NIH HHS [CA 39782] NR 18 TC 27 Z9 27 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD FEB 25 PY 1992 VL 20 IS 4 BP 859 EP 864 DI 10.1093/nar/20.4.859 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HG350 UT WOS:A1992HG35000031 PM 1542577 ER PT J AU CLAVERIE, A YU, KM SWIDER, W LILIENTALWEBER, Z OKEEFE, M KILAAS, R PAMULAPATI, J BHATTACHARYA, PK AF CLAVERIE, A YU, KM SWIDER, W LILIENTALWEBER, Z OKEEFE, M KILAAS, R PAMULAPATI, J BHATTACHARYA, PK TI STRUCTURAL CHARACTERIZATION OF LOW-TEMPERATURE MOLECULAR-BEAM EPITAXIAL IN0.52AL0.48AS/INP HETEROLAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID MBE AB A systematic study of the structural quality and arsenic content of as-grown In0.52Al0.48As/InP layers deposited on InP by molecular beam epitaxy at temperatures between 150 and 450-degrees-C was performed using transmission electron microscopy and particle-induced x-ray emission. We found that the amount of As incorporated in the layers generally increases with decreasing growth temperature, with the crystalline quality of the layers being good at growth temperatures higher than 200-degrees-C. At 150-degrees-C, a large density of pyramidal defects is formed, the defects are related to the very large amount of excess As incorporated into the layer. The mechanisms leading to the formation of these defects are discussed. At 200-degrees-C, however, the amount of excess As is lower than expected, and wavy streaks of diffuse scattering are seen in electron diffraction. It is shown that small ordered domains of the CuPt type on the group III atoms are responsible for these features. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,NATL CTR ELECTR MICROSCOPY,BERKELEY,CA 94720. UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,SOLID STATE ELECTR LAB,ANN ARBOR,MI 48109. CNRS,CTR ELABORAT MAT & ETUD STRUCT,F-31055 TOULOUSE,FRANCE. RP CLAVERIE, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012; Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 13 TC 20 Z9 20 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 24 PY 1992 VL 60 IS 8 BP 989 EP 991 DI 10.1063/1.106483 PG 3 WC Physics, Applied SC Physics GA HE661 UT WOS:A1992HE66100024 ER PT J AU MARTENS, JS HIETALA, VM ZIPPERIAN, TE VAWTER, GA GINLEY, DS TIGGES, CP PLUT, TA HOHENWARTER, GKG AF MARTENS, JS HIETALA, VM ZIPPERIAN, TE VAWTER, GA GINLEY, DS TIGGES, CP PLUT, TA HOHENWARTER, GKG TI FABRICATION OF TLCABACUO STEP-EDGE JOSEPHSON-JUNCTIONS WITH HYSTERETIC BEHAVIOR SO APPLIED PHYSICS LETTERS LA English DT Article AB One way to create hysteretic Josephson junctions from the currently available nonhysteretic high temperature superconducting junctions is to artificially add capacitance. We have adapted a multilayer technique for artificial capacitance addition/grain boundary modification to produce TlCaBaCuO step-edge junctions exhibiting large amounts of hysteresis at 77 K. A gaplike structure is present at 32-36 mV that has a temperature dependence that does not contradict that predicted by the Bardeen-Cooper-Schrieffer theory. In addition, the junctions show fast switching times, less than a fixture limited 20 ps, and Fraunhofer-like dependence of critical current on magnetic field. C1 UNIV WISCONSIN,DEPT ELECT & COMP ENGN,MADISON,WI 53706. RP MARTENS, JS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 28 Z9 28 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 24 PY 1992 VL 60 IS 8 BP 1013 EP 1015 DI 10.1063/1.106506 PG 3 WC Physics, Applied SC Physics GA HE661 UT WOS:A1992HE66100032 ER PT J AU SOMORJAI, GA AF SOMORJAI, GA TI THE SURFACE SCIENCE CONCEPTS OF HETEROGENEOUS CATALYSIS - THE BUILDING OF COMPLEX CATALYSTS SYSTEMS ON SINGLE-CRYSTAL SURFACES SO CATALYSIS TODAY LA English DT Article AB Surface science studies have aided the molecular formulation and the elucidation of the concepts of heterogeneous catalysis. These include the thermal activation of bond breaking, the unique chemical activity of rough surfaces, the dynamic chemisorption - induced restructuring of surfaces and the coadsorption bond. The high catalytic activities of bimetallic catalysts and oxide-metal interfaces can be rationalized using these concepts. Complex model catalyst systems can be built by vapour deposition of the various ingredients on metal crystal surfaces. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. NR 20 TC 13 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD FEB 24 PY 1992 VL 12 IS 4 BP 343 EP 353 DI 10.1016/0920-5861(92)80049-S PG 11 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JU289 UT WOS:A1992JU28900003 ER PT J AU DUNNE, G LERDA, A SCIUTO, S TRUGENBERGER, CA AF DUNNE, G LERDA, A SCIUTO, S TRUGENBERGER, CA TI EXACT MULTI-ANYON WAVE-FUNCTIONS IN A MAGNETIC-FIELD SO NUCLEAR PHYSICS B LA English DT Article ID FRACTIONAL-STATISTICS; QUANTUM STATISTICS; GENERAL-THEORY; 2 DIMENSIONS; MECHANICS; REPRESENTATIONS; PARTICLES; STATES AB We present a systematic analysis of the N-body problem for anyons in the presence of an external magnetic field. We find exact N-particle anyonic wave functions which are eigenstates of both energy and angular momentum. We prove the general belief that multi-anyon wave functions fall into two classes. Our wave functions are generated algebraically by the action of symmetrized step operators on two base states. For a generic statistics parameter we identify those combinations of step operators which produce wave functions satisfying the appropriate physical statistics and regularity conditions. For the special case of integer statistics parameter (i.e. bosons or fermions), all combinations are allowed and give all the usual Slater multi-particle states. We also present certain classes of anyonic wave functions in closed functional form. C1 MIT,CTR THEORET PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORY T-8,LOS ALAMOS,NM 87545. RP DUNNE, G (reprint author), MIT,DEPT MATH,CAMBRIDGE,MA 02139, USA. RI Lerda, Alberto/J-9093-2015 OI Lerda, Alberto/0000-0002-1374-6608 NR 56 TC 57 Z9 58 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD FEB 24 PY 1992 VL 370 IS 3 BP 601 EP 635 DI 10.1016/0550-3213(92)90425-B PG 35 WC Physics, Particles & Fields SC Physics GA HJ428 UT WOS:A1992HJ42800004 ER PT J AU LEE, KY NAIR, VP WEINBERG, EJ AF LEE, KY NAIR, VP WEINBERG, EJ TI A CLASSICAL INSTABILITY OF REISSNER-NORDSTROM SOLUTIONS AND THE FATE OF MAGNETICALLY CHARGED BLACK-HOLES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MONOPOLES; FIELD AB Working in the context of spontaneously broken gauge theories, we show that the magnetically charged Reissner-Nordstrom solution develops a classical instability if the horizon is sufficiently small. This instability has significant implications for the evolution of a magnetically charged black hole. In particular, it leads to the possibility that such a hole could evaporate completely, leaving in its place a nonsingular magnetic monopole. C1 FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP LEE, KY (reprint author), COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027, USA. RI Lee, Kimyeong/K-1070-2013 OI Lee, Kimyeong/0000-0003-3451-1514 NR 15 TC 90 Z9 90 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 24 PY 1992 VL 68 IS 8 BP 1100 EP 1103 DI 10.1103/PhysRevLett.68.1100 PG 4 WC Physics, Multidisciplinary SC Physics GA HE603 UT WOS:A1992HE60300003 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, GM GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LISS, TM LIMON, P LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PAULETTA, G PARE, E PARK, S PATRICK, J PESCARA, L PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, GM GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LISS, TM LIMON, P LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PAULETTA, G PARE, E PARK, S PATRICK, J PESCARA, L PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI INCLUSIVE JET CROSS-SECTION IN PBARP COLLISIONS AT SQUARE-ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUARK AB We present a measurement of the inclusive jet cross section in ppBAR collisions at square-root s = 1.8 TeV at the Fermilab Tevatron using the Collider Detector at Fermilab. Good agreement is seen with the predictions of recent next-to-leading-order [O(alpha(s)3)] QCD predictions. The dependence of the cross section on clustering cone size is reported for the first time. An improved limit on LAMBDA(c), a term characterizing possible quark substructure, is set at 1.4 TeV (95% C.L.). C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,SCH MED,BOSTON,MA 02115. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV PADUA,IST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052 NR 21 TC 81 Z9 81 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 24 PY 1992 VL 68 IS 8 BP 1104 EP 1108 DI 10.1103/PhysRevLett.68.1104 PG 5 WC Physics, Multidisciplinary SC Physics GA HE603 UT WOS:A1992HE60300004 ER PT J AU SPARN, G THOMPSON, JD WHETTEN, RL HUANG, SM KANER, RB DIEDERICH, F GRUNER, G HOLCZER, K AF SPARN, G THOMPSON, JD WHETTEN, RL HUANG, SM KANER, RB DIEDERICH, F GRUNER, G HOLCZER, K TI PRESSURE AND FIELD-DEPENDENCE OF SUPERCONDUCTIVITY IN RB3C60 SO PHYSICAL REVIEW LETTERS LA English DT Article AB Direct measurements of the pressure dependence of the superconducting transition temperature T(c) for single-phase Rb3C60 provide for the first time substantial evidence that T(c) in A3C60 compounds may be a universal function of the lattice constant (inter-C60 spacing). Determination of the lower (H(c1)) and upper (H(c2)) critical fields, and consequently the superconducting penetration depth and coherence length, is also reported. Compared to K3C60, the measured quantities are consistent with a 15% larger electronic-state density in Rb3C60 arising from a greater inter-C60 spacing in this compound. C1 UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,CTR SOLID STATE SCI,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST,HUNGARY. RP SPARN, G (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Sparn, Guenter/F-5120-2013 NR 24 TC 152 Z9 152 U1 0 U2 13 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 24 PY 1992 VL 68 IS 8 BP 1228 EP 1231 DI 10.1103/PhysRevLett.68.1228 PG 4 WC Physics, Multidisciplinary SC Physics GA HE603 UT WOS:A1992HE60300035 ER PT J AU OLAMI, Z FEDER, HJS CHRISTENSEN, K AF OLAMI, Z FEDER, HJS CHRISTENSEN, K TI SELF-ORGANIZED CRITICALITY IN A CONTINUOUS, NONCONSERVATIVE CELLULAR AUTOMATON MODELING EARTHQUAKES SO PHYSICAL REVIEW LETTERS LA English DT Article ID DYNAMICS; SYSTEMS; FAULT AB We introduce a new nonconservative self-organized critical model. This model is equivalent to a quasistatic two-dimensional version of the Burridge-Knopoff spring-block model of earthquakes. Our model displays a robust power-law behavior. The exponent is not universal; rather it depends on the level of conservation. A dynamical phase transition from localized to nonlocalized behavior is seen as the level of conservation is increased. The model gives a good prediction of the Gutenberg-Richter law and an explanation to the variances in t e observed b values. C1 AARHUS UNIV,INST PHYS & ASTRON,DK-8000 AARHUS,DENMARK. RP OLAMI, Z (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 19 TC 696 Z9 717 U1 0 U2 50 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 24 PY 1992 VL 68 IS 8 BP 1244 EP 1247 DI 10.1103/PhysRevLett.68.1244 PG 4 WC Physics, Multidisciplinary SC Physics GA HE603 UT WOS:A1992HE60300039 ER PT J AU DOSKEY, PV GAFFNEY, JS AF DOSKEY, PV GAFFNEY, JS TI NONMETHANE HYDROCARBONS IN THE ARCTIC ATMOSPHERE AT BARROW, ALASKA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SOURCE-RECONCILIATION; GASEOUS TRACERS; AEROSOL; HAZE; ORGANICS; CARBON AB C2-C8 non-methane hydrocarbons (NMHCs) were detected in the arctic atmosphere at Barrow, Alaska, during seven sampling periods in March 1989. The most prominent NMHCs were ethene, acetylene, ethane, propane and benzene. The concentrations and distribution of these species were similar to those observed at the same location in 1982 and in the Norwegian Arctic in 1983. The distribution of NMHCs in background arctic air during this period was similar to that of aged urban air. These findings provide additional evidence that NMHCs in the arctic atmosphere during spring may originate from industrialized mid-latitude regions and contribute to the arctic haze phenomenon. RP DOSKEY, PV (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 23 TC 22 Z9 22 U1 0 U2 9 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 21 PY 1992 VL 19 IS 4 BP 381 EP 384 DI 10.1029/91GL03136 PG 4 WC Geosciences, Multidisciplinary SC Geology GA HF221 UT WOS:A1992HF22100013 ER PT J AU BOEHME, DR NICHOLS, MC SNYDER, RL MATHEIS, DP AF BOEHME, DR NICHOLS, MC SNYDER, RL MATHEIS, DP TI AN INVESTIGATION OF THE TELLURIUM-RICH URANIUM TELLURIDES USING X-RAY-POWDER DIFFRACTION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID PENTATELLURIDE; UTE5 AB A comprehensive X-ray powder diffraction study of synthesized uranium telluride phases produced new and improved diffraction pattern data compared to published values. Experimental work at the tellurium-rich end of the U-Te phase diagram, using a high intensity rotating anode diffraction system, has yielded data for the phases UTe2, U2Te5, UTe3, UTe3.4 and UTe5. Indexing of this experimental diffraction data has produced more complete patterns for the previously published phases UTe2, UTe3 and UTe5. The first conclusive experimental diffractometer data are presented proving the existence of the phase U2Te5. The phase UTe3.4 is structurally very similar to a reported beta-UTe3, but is considered to be a new phase based on its composition and computer indexing. C1 ALFRED UNIV,NEW YORK STATE COLL CERAM,INST CERAM SUPERCONDUCT,ALFRED,NY 14802. RP BOEHME, DR (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 26 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD FEB 21 PY 1992 VL 179 BP 37 EP 59 DI 10.1016/0925-8388(92)90203-L PG 23 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HG643 UT WOS:A1992HG64300011 ER PT J AU MAIENSCHEIN, JL BOWERS, JS CANTRELL, JS BEITER, TA AF MAIENSCHEIN, JL BOWERS, JS CANTRELL, JS BEITER, TA TI THERMAL CRYSTALLINE-TO-AMORPHOUS TRANSITION OF BERYLLIUM HYDRIDE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID LIH AB An irreversible thermally induced solid-state phase change in crystalline beryllium hydride has been discovered, with the product being amorphous or glassy beryllium hydride. The phase change was observed using simultaneous differential thermal analysis/thermogravimetric analysis and using X-ray diffraction. The phase change takes place at 485-550 K, just below the thermal decomposition temperature of 570 K. There is slight decomposition of the beryllium hydride during the phase change of about 5 +/- 2%. The enthalpy change associated with the phase transition is 2.3 +/- 0.7 kJ mol-1. C1 MIAMI UNIV,OXFORD,OH 45056. RP MAIENSCHEIN, JL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 5 Z9 5 U1 1 U2 4 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 21 PY 1992 VL 179 BP 157 EP 163 DI 10.1016/0925-8388(92)90215-U PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HG643 UT WOS:A1992HG64300023 ER PT J AU MALOMED, BA AF MALOMED, BA TI PERTURBATIVE ANALYSIS OF THE INTERACTION OF A PHI-4-KINK WITH INHOMOGENEITIES SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID ORDER-DISORDER SYSTEMS; UNIFIED APPROACH; DYNAMICS; DISPLACIVE; SOLITONS; MODEL AB Dynamics of a kink in the phi(4) model with additional terms accounting for localized or spatially random inhomogeneities are analysed by means of the perturbation theory. First, conditions for the capture of the free kink by a local defect are found. Next, emission of radiation by the kink colliding with the local defect, and collision-induced generation of the kink's shape (internal) mode and the defect-sustained impurity mode are considered. Finally, the non-dissipative braking of the moving kink in a randomly inhomogeneous medium on account of the excitation of the shape mode is analysed. C1 PP SHIRSHOV OCEANOL INST,MOSCOW 117218,USSR. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87544. NR 16 TC 14 Z9 14 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 21 PY 1992 VL 25 IS 4 BP 755 EP 764 DI 10.1088/0305-4470/25/4/015 PG 10 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA HF567 UT WOS:A1992HF56700015 ER PT J AU LU, X ARDUINISCHUSTER, MC KUHN, J NILSSON, O FRICKE, J PEKALA, RW AF LU, X ARDUINISCHUSTER, MC KUHN, J NILSSON, O FRICKE, J PEKALA, RW TI THERMAL-CONDUCTIVITY OF MONOLITHIC ORGANIC AEROGELS SO SCIENCE LA English DT Article AB The total thermal conductivity lambda of resorcinol-formaldehyde aerogel monoliths has been measured as a function of density-rho in the range from rho = 80 to 300 kilograms per cubic meter. A record-low conductivity value in air at 300 K of lambda almost-equal-to 0.012 watt per meter per kelvin was found for rho almost-equal-to 157 kilograms per cubic meter. Caloric measurements under variation of gas pressure as well as spectral infrared transmission measurements allowed the determination of solid conductivity, gaseous conductivity, and radiative conductivity as a function of density. The development of such low conductivity materials is of great interest with respect to the substitution of environmentally harmful insulating foams made from chlorofluorocarbons. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM & MAT RES SCI,BERKELEY,CA 94720. RP LU, X (reprint author), UNIV WURZBURG,INST PHYS,HUBLAND,W-8700 WURZBURG,GERMANY. NR 12 TC 158 Z9 177 U1 10 U2 111 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 21 PY 1992 VL 255 IS 5047 BP 971 EP 972 DI 10.1126/science.255.5047.971 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HE605 UT WOS:A1992HE60500036 PM 17793159 ER PT J AU RAMER, ER SHAFFER, FD AF RAMER, ER SHAFFER, FD TI AUTOMATED-ANALYSIS OF MULTIPLE-PULSE PARTICLE IMAGE VELOCIMETRY DATA SO APPLIED OPTICS LA English DT Article DE VELOCIMETRY; PULSED LASER VELOCIMETRY; PARTICLE IMAGE VELOCIMETRY AB An application of multiple-pulse particle image velocimetry to the study of particle motion in a two-phase flow through a cylindrical tube bank is described. An algorithm is developed that automatically analyzes the digital, multiply exposed pictures of this flow and determines the particle trajectories, using a linear particle image tracking method. From these trajectories particle velocities as well as points of impact and angles of incidence and rebound for particles that collide with the cylinder surfaces are determined. This algorithm is sufficiently rapid that data can be collected and analyzed contemporaneously. RP RAMER, ER (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1992 VL 31 IS 6 BP 779 EP 784 PG 6 WC Optics SC Optics GA HD626 UT WOS:A1992HD62600018 PM 20720684 ER PT J AU MILONNI, PW THODE, LE AF MILONNI, PW THODE, LE TI THEORY OF MESOSPHERIC SODIUM FLUORESCENCE EXCITED BY PULSE TRAINS SO APPLIED OPTICS LA English DT Article ID LIDAR; ASTRONOMY AB We describe a two-level model for the mesospheric sodium resonance fluorescence excited by a train of pulses. For pulse durations that are short compared with the 16-ns natural lifetime, population-rate equations are inadequate and must be replaced by density-matrix (Bloch) equations. We briefly contrast these two approaches and discuss several issues associated with pulse-train excitation. Analytical approximations to averages over atomic velocities and the transverse spatial profile of the laser are described. Estimates of return photon numbers for trains of pulses, ranging in duration from tens of picoseconds to half a nanosecond, are made and these estimates are compared with those of more conventional long-pulse lidar schemes. Roughly similar photon numbers are predicted for both long and short pulses whenever their average intensities are comparable. For average intensities, less than approximately 10 W/cm2, trains of almost-equal-to 0.5-ns pulses yield greater photon returns than trains of almost-equal-to 30-ps pulses. For larger intensities the reverse can be true. RP MILONNI, PW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 29 Z9 32 U1 2 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1992 VL 31 IS 6 BP 785 EP 800 PG 16 WC Optics SC Optics GA HD626 UT WOS:A1992HD62600019 PM 20720685 ER PT J AU GUZIK, JA COX, AN AF GUZIK, JA COX, AN TI ON THE SENSITIVITY OF HIGH-DEGREE P-MODE FREQUENCIES TO THE SOLAR CONVECTION ZONE HELIUM ABUNDANCE SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ABUNDANCES; SUN, INTERIOR; SUN, OSCILLATIONS ID STELLAR ENVELOPES; OPACITY TABLES; EQUATION; STATE; SUN; DIFFUSION AB For the standard solar model of Guzik & Cox, incorporating the latest opacities and the Mihalas et al. (MHD) equation of state (EOS), the calculated nonadiabatic p-mode frequencies of degree l = 1-200 differed from observed frequencies by at most approximately 4-mu-Hz. For degrees l = 300-1000, which sample the upper convection zone, larger discrepancies of 5.30-mu-Hz were found, which may be attributed to larger observational uncertainties, inadequacies in the EOS tables or low-temperature opacities, or a decrease in convection zone helium abundance due to gravitational and thermal diffusion. Here we compare nonadiabatic frequencies for modes of degree l = 200-1000 for the MHD EOS model described in Guzik & Cox with Y = 0.27, and a model with convection zone Y = 0.24, corresponding to the decrease expected due to diffusion. The frequencies of the l = 300-600 modes, which sample best the helium ionization region, show the greatest sensitivity to this helium abundance change. The frequency sensitivity to helium abundance is not affected by changes in the mixing-length/pressure scale height ratio or the inclusion of turbulent pressure, although these effects can alter considerably the upper convection zone structure and the calculated frequencies. The observed minus calculated frequency differences for these high-degree low-order modes are discussed, using recent observations of both Libbrecht et al, and Korzennik. The O - C differences for the accurately observed modes favor a reduction in convection zone helium mass fraction of about 0.03, consistent with that expected due to diffusion. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET PHYS,LOS ALAMOS,NM 87545. RP GUZIK, JA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,X-2,MS B220,LOS ALAMOS,NM 87545, USA. NR 32 TC 23 Z9 23 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 1992 VL 386 IS 2 BP 729 EP 733 DI 10.1086/171054 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HC827 UT WOS:A1992HC82700030 ER PT J AU CLAY, MA NEWNHAM, HH FORTE, TM BARTER, PI AF CLAY, MA NEWNHAM, HH FORTE, TM BARTER, PI TI CHOLESTERYL ESTER TRANSFER PROTEIN AND HEPATIC LIPASE ACTIVITY PROMOTE SHEDDING OF APO A-I FROM HDL AND SUBSEQUENT FORMATION OF DISCOIDAL HDL SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE HEPATIC LIPASE; CHOLESTERYL ESTER TRANSFER PROTEIN ID HIGH-DENSITY LIPOPROTEINS; HUMAN-PLASMA; TRIGLYCERIDE LIPASES; INVITRO MODULATION; RAT-LIVER; APOLIPOPROTEIN; LIPOLYSIS; ACYLTRANSFERASE; PARTICLES; LECITHIN AB The effects of lipid transfers and hepatic lipase (HL) on the concentration, composition, particle size distribution and morphology of high density lipoproteins (HDL) have been investigated. Human plasma supplemented with additional very low density lipoproteins (VLDL), cholesteryl ester transfer protein (CETP) and HL has been incubated at 37-degrees-C for up to 8 h. The HDL became depleted of cholesteryl esters and reduced in particle size. Within 2 h of such incubation they had also lost about 30% of their apo A-I. However, with extension of the incubations beyond 2 h, the apo A-I returned progressively to the HDL fraction until, after 8 h, the concentration of apo A-I in HDL was identical to that in non-incubated samples. This return of apo A-I to the HDL density range was accompanied by a progressive appearance in electron micrographs of discoidal HDL particles. Thus, the depletion of the core lipid content and the reduction in particle size of HDL promoted by lipid transfers and HL activity in vitro is accompanied by a shedding of apo A-I which forms the nucleus of new discoidal HDL particles. The potential physiological importance of such a process is considerable. C1 UNIV WOLLONGONG,GRAD SCH HLTH & MED SCI,POB 1144,WOLLONGONG,NSW 2500,AUSTRALIA. BAKER MED RES INST,PRAHRAN,VIC 3181,AUSTRALIA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL 18574] NR 30 TC 127 Z9 127 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD FEB 20 PY 1992 VL 1124 IS 1 BP 52 EP 58 DI 10.1016/0005-2760(92)90125-F PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HH573 UT WOS:A1992HH57300009 PM 1543725 ER PT J AU GIVEON, A HALPERN, MB KIRITSIS, EB OBERS, NA AF GIVEON, A HALPERN, MB KIRITSIS, EB OBERS, NA TI THE SUPERCONFORMAL MASTER EQUATION SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article AB We obtain the superconformal master equation, which collects the superconformal solutions of the Virasoro master equation on g(x) x SO(p, q)1. The associated super C-function and super C-theorem are also obtained. A high-level expansion of the superconformal ansatz {SO(n)diag x SO[dim SO(n)]1}N = 1 shows a large class of new, generically irrational superconformal field theories with a three-form living on the signed graphs of order n. The extension to general N = 2 superconformal symmetry is also given. RP GIVEON, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. RI Kiritsis, Elias/F-3501-2011 NR 0 TC 7 Z9 7 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD FEB 20 PY 1992 VL 7 IS 5 BP 947 EP 972 DI 10.1142/S0217751X92000429 PG 26 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA GZ815 UT WOS:A1992GZ81500003 ER PT J AU LINDBERG, SE MEYERS, TP TAYLOR, GE TURNER, RR SCHROEDER, WH AF LINDBERG, SE MEYERS, TP TAYLOR, GE TURNER, RR SCHROEDER, WH TI ATMOSPHERE-SURFACE EXCHANGE OF MERCURY IN A FOREST - RESULTS OF MODELING AND GRADIENT APPROACHES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID DEPOSITION VELOCITIES; ELEMENTAL MERCURY; VAPOR; VEGETATION; WATER; AIR; SO2 AB We have modified recently published dry deposition models to estimate deposition velocities (V(d)) for Hg in both fine aerosol and vapor form to forest canopy surfaces. Aerosol and total vapor phase Hg concentrations in air previously measured at Walker Branch Watershed in Tennessee have been used with model results to estimate dry deposition to a deciduous forest. The concentration data confirm that airborne Hg is dominated by vapor forms at this site and exhibits concentrations moderately above continental background levels. The modeled V(d) values reflect published data which suggest that dry deposition of Hg vapor is strongly controlled by surface transport processes, notably stomatal and mesophyll resistances, the latter dominating. Weekly mean V(d) values ranged from 0.006 (winter) to 0.12 (summer) cm s-1. We have also measured concentration gradients of Hg vapor in air above this forest to estimate air-surface exchange during short-term experiments. While the model results indicate that the canopy is a sink for Hg vapor, the concentration profiles suggest that the forest soils are a source during some periods, the combined effect of which is net Hg fluxes in the upward direction. Application of a detailed canopy turbulence model yielded soil emission rates of the order of 50 ng Hg m-2 h-1, approximately 10% of which is deposited in the canopy. Our modeled dry deposition estimates plus limited measurements of wet deposition in this area suggest that dry and wet deposition may be comparable in magnitude. RP LINDBERG, SE (reprint author), OAK RIDGE NATL LAB, DIV ENVIRONM SCI, POB 2008, OAK RIDGE, TN 37831 USA. RI Meyers, Tilden/C-6633-2016 NR 43 TC 150 Z9 151 U1 4 U2 26 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 1992 VL 97 IS D2 BP 2519 EP 2528 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HE957 UT WOS:A1992HE95700007 ER PT J AU BROOKS, PR HARLAND, PW PHILLIPS, LF CARMAN, HS AF BROOKS, PR HARLAND, PW PHILLIPS, LF CARMAN, HS TI COLLISION DYNAMICS OF ALKALI-METAL ATOMS WITH ORIENTED SYMMETRICAL-TOP MOLECULES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-TRANSFER; BEAM REACTION; K-ATOMS; SCATTERING AB Theoretical calculations based on the long-range dynamics of the harpoon model have been used to predict the effects of reactant orientation upon ionization yields and angular distributions of product MX for reactions of alkali-metal atoms M with oriented symmetric-top molecules of general formula CY3X, where X is a halogen and Y is H, F, or methyl. Large effects of orientation upon ionization yield near threshold are found to result from differences in the partitioning of kinetic energy between relative motion and center-of-mass motion, depending on whether the X- ion ejected by the unstable CY3X- ion is traveling in the same direction as the incoming M+ ion or the opposite direction. For most systems for which comparison is possible, excellent agreement is obtained with experimental data on the effect of orientation upon ionization yield. For ionizing collisions of fast K atoms with CH3I and CH3F, and for product angular distributions found with thermal K atoms and oriented CF3I and CF3Br, the theory is less successful and it appears that orientation-dependent short-range interactions must play a major role. C1 UNIV CANTERBURY,DEPT CHEM,CHRISTCHURCH 1,NEW ZEALAND. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 18 TC 10 Z9 10 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 20 PY 1992 VL 96 IS 4 BP 1557 EP 1561 DI 10.1021/j100183a014 PG 5 WC Chemistry, Physical SC Chemistry GA HF283 UT WOS:A1992HF28300014 ER PT J AU KLOTS, CE AF KLOTS, CE TI ARRHENIUS PARAMETERS FOR IONIC FRAGMENTATIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID UNIMOLECULAR DECAY-RATES; DISSOCIATION DYNAMICS; C4H4X IONS; ENERGY; THERMOCHEMISTRY; SINGLE AB Rate constants as a function of energy for the dissociation of more than 25 molecular ions, drawn from the literature, are analyzed in order to extract their attendant Arrhenius parameters. Subtleties of the extraction process are discussed, and used to which the parameters might be put are indicated. RP KLOTS, CE (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,CHEM PHYS SECT,OAK RIDGE,TN 37831, USA. NR 31 TC 17 Z9 17 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 20 PY 1992 VL 96 IS 4 BP 1733 EP 1737 DI 10.1021/j100183a044 PG 5 WC Chemistry, Physical SC Chemistry GA HF283 UT WOS:A1992HF28300044 ER PT J AU GEHLEN, JN CHANDLER, D KIM, HJ HYNES, JT AF GEHLEN, JN CHANDLER, D KIM, HJ HYNES, JT TI FREE-ENERGIES OF ELECTRON-TRANSFER SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NONEQUILIBRIUM SOLVATION; EQUILIBRIUM; FORMULATION; SYSTEM AB A simple class of Hamiltonian models of electron-transfer systems in analyzed. We focus on the activation free energy governing the charge transfer, and especially the role of fast solvent electronic polarization. The analysis of the free energy is carried out exactly and also by a self-consistent mean field approximation that has been used in this context. Comparison with the exact analysis in the limit that the solvent electronic polarization is much faster than the time scale of the transferring electron indicates that the predictions of the mean field approximation are generally erroneous. The correct activation free energy is in agreement with traditional estimates. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309. RI Kim, Hyung/S-3066-2016 OI Kim, Hyung/0000-0003-4334-1879 NR 21 TC 127 Z9 129 U1 2 U2 14 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 20 PY 1992 VL 96 IS 4 BP 1748 EP 1753 DI 10.1021/j100183a047 PG 6 WC Chemistry, Physical SC Chemistry GA HF283 UT WOS:A1992HF28300047 ER PT J AU KLEMM, RB SUTHERLAND, JW RABINOWITZ, MJ PATTERSON, PM QUARTEMONT, JM WEN, T AF KLEMM, RB SUTHERLAND, JW RABINOWITZ, MJ PATTERSON, PM QUARTEMONT, JM WEN, T TI SHOCK-TUBE KINETIC-STUDY OF METHANE DISSOCIATION - 1726-K LESS-THAN-OR-EQUAL-TO-T-LESS-THAN-OR-EQUAL-TO 2134-K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID RESONANCE-ABSORPTION; FLASH-PHOTOLYSIS; RATE CONSTANTS; + H; TEMPERATURE; DECOMPOSITION; PYROLYSIS; WAVES; OXIDATION; PRESSURE AB In this kinetic study of the thermal dissociation of methane in argon, primary product H atoms were monitored directly using the sensitive ARAS detection method. Absolute H atom concentration was determined in separate calibration experiments using N2O/H2 mixtures diluted in argon. Rate constants were obtained under or near low-pressure limit conditions in shock tube experiments performed in the reflected regime. The CH4 mole fraction was varied between 100 and 1300 ppm, and conversions of CH4 were typically 0.2% or less. The temperature ranged from 1726 to 2134 K. Rate data were analyzed at T less-than-or-equal-to 1900 K using a steady-state approximation, and at higher temperatures, rate constants were derived from simulations of [H](t) profiles. The results of 37 experimental determinations were fit to the following Arrhenius expression: k-degrees-diss(T) = 6.8 x 10(-8) exp(-44900K/T) cm3 molecule-1 S-1. The overall uncertainty of values derived from this expression is estimated to be about +/- 50%. RRKM and master equation calculations were performed to evaluate the fall-off behavior of the unimolecular rate constant and to allow comparison of the present results with those of previous studies of methane dissociation. A large discrepancy is noted, and some reasons for this disagreement are discussed. C1 NASA,LERC,CLEVELAND,OH 44135. RP KLEMM, RB (reprint author), BROOKHAVEN NATL LAB,BLDG 815,UPTON,NY 11973, USA. NR 39 TC 17 Z9 17 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 20 PY 1992 VL 96 IS 4 BP 1786 EP 1793 DI 10.1021/j100183a054 PG 8 WC Chemistry, Physical SC Chemistry GA HF283 UT WOS:A1992HF28300054 ER PT J AU SAIGAL, A KUPPERMAN, DS MAJUMDAR, S AF SAIGAL, A KUPPERMAN, DS MAJUMDAR, S TI RESIDUAL STRAINS IN TITANIUM MATRIX HIGH-TEMPERATURE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID FIBER-REINFORCED GLASS; NEUTRON-DIFFRACTION; THERMAL-STRESSES AB Residual thermal strains and stresses that developed during cooling of a silicon-carbide-fiber-reinforced titanium matrix high-temperature composite were determined by an experimental neutron diffraction technique. The results were compared with those obtained by finite element analysis. The study was conducted over the temperature range 20-950-degrees-C. As a result of thermal expansion mismatch, compressive residual strains and stresses were generated in the fibers during cool-down. The axial residual strains and stresses were highly tensile in the matrix, and the matrix underwent plastic deformation. Average transverse residual strains in the matrix were compressive. The measured data compare fairly well with finite element method prediction. The effects of fabrication procedures and thermal processing, such as liquid nitrogen dipping and thermal cycling, on the residual strains were also studied. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. RP SAIGAL, A (reprint author), TUFTS UNIV,DEPT MECH ENGN,MEDFORD,MA 02155, USA. NR 14 TC 39 Z9 40 U1 1 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 20 PY 1992 VL 150 IS 1 BP 59 EP 65 DI 10.1016/0921-5093(90)90008-Q PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA HH137 UT WOS:A1992HH13700007 ER PT J AU MUELLER, BA TANNER, LE PEREPEZKO, JH AF MUELLER, BA TANNER, LE PEREPEZKO, JH TI MICROSTRUCTURE DEVELOPMENT IN UNDERCOOLED AL-BE POWDERS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID ALLOYS AB The development of solidification microstructure in aluminum-rich Al-Be alloy powders was studied as a function of melt undercooling, cooling rate. powder size and beryllium content. Auger electron spectroscopy indicates that BeO partially displaces Al2O3 from the powder surface. The BeO-Al2O3 coating reduces the attainable undercooling at beryllium contents above about 4 at.% Be. Powders containing Al-9at.%Be when cooled at 0.5-degrees-C s-1 contain facetted primary beryllium and a cellular aluminum matrix. Increasing the cooling rate to 25-degrees-C s-1 reduces the extent of facetting of the primary beryllium phase, and at a cooling rate of 500-degrees-C s-1 multiple primary beryllium dendrites are observed. In Al-4at.%Be powders cooled at 500-degrees-C s-1, primary beryllium formation is avoided and solidification commences with a cellular aluminum and intercellular beryllium structure. The aluminum cells evolve to a dendritic network during recalescence. Following recalescence the dendritic aluminum and interdendritic beryllium structure is replaced by a coupled eutectic morphology which completes solidification. The microstructure development is analyzed in terms of the solidification pathways possible based on a skewed coupled eutectic growth zone and composite stable-metastable phase diagrams including a metastable liquid miscibility gap. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV WISCONSIN,DEPT MAT SCI & ENGN,MADISON,WI 53706. RP MUELLER, BA (reprint author), HOWMET CORP,WHITEHALL,MI 49461, USA. NR 24 TC 12 Z9 12 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD FEB 20 PY 1992 VL 150 IS 1 BP 123 EP 132 DI 10.1016/0921-5093(90)90015-U PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA HH137 UT WOS:A1992HH13700014 ER PT J AU LEE, CH AF LEE, CH TI MATTER DISTRIBUTION IN A FALSE VACUUM BUBBLE SO MODERN PHYSICS LETTERS A LA English DT Article AB The dynamics of matter distribution that may contaminate a false vacuum bubble is considered. In the case of uniform dust distribution, it is shown that the distribution eventually collapses (expands) if the matter energy density is greater (smaller) than twice the false vacuum energy density. The effect of matter distribution on the dynamics of the bubble wall is discussed. RP LEE, CH (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BOX 500,BATAVIA,IL 60510, USA. NR 0 TC 2 Z9 2 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 1992 VL 7 IS 5 BP 419 EP 426 DI 10.1142/S0217732392000367 PG 8 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA HG808 UT WOS:A1992HG80800006 ER PT J AU ZHU, Q COX, DE FISCHER, JE KNIAZ, K MCGHIE, AR ZHOU, O AF ZHU, Q COX, DE FISCHER, JE KNIAZ, K MCGHIE, AR ZHOU, O TI INTERCALATION OF SOLID C-60 WITH IODINE SO NATURE LA English DT Article AB METALLIC and superconducting donor-type intercalation compounds of C60 are now well established. These involve electron transfer from a sublattice of alkali-metal dopants to a sublattice of fullerene molecules. Three stoichiometric phases have been identified 1-3, and a binary phase diagram describing composition regions of two-phase coexistence has been proposed 2. Oxidative intercalation by electron acceptors, meanwhile, has not previously been reported. Ohno et al. 4 recently presented photoemission data suggesting that solid C60 Will take up only minor amounts of iodine, resulting in a non-metallic product which is not a stoichiometric compound 4. Here we report that, by using different reaction conditions, we have prepared a highly crystalline C60: iodine compound of ideal stoichiometry C60I4, with an alternating guest-host layer structure closely resembling that of classic intercalation compounds. The 300-K resistivity exceeds 10(9) OMEGA-cm and we observe no superconductivity down to 4 K, despite the fact that the inter-fullerene separation lies in the range of that in the superconducting M3 C60 phases (where M is K, Rb, Cs). C60I4 is apparently the first example of a fullerite intercalation compound in which there is no electron transfer between C60 and the intercalate. C1 UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104. UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 16 TC 120 Z9 120 U1 3 U2 17 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD FEB 20 PY 1992 VL 355 IS 6362 BP 712 EP 714 DI 10.1038/355712a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HE604 UT WOS:A1992HE60400058 ER PT J AU HICKS, KH ALBURGER, DE AF HICKS, KH ALBURGER, DE TI SEARCH FOR A LIGHT NEUTRAL BOSON ASSOCIATED WITH BETA-DECAY SO PHYSICS LETTERS B LA English DT Article ID 17-KEV NEUTRINO; SPECTRUM AB A gamma-gamma coincidence measurement was performed in order to search for a neutral scalar particle associated with beta decay with a mass near 17 keV. The measurement used a S-35 source and two LEPS-type Ge detectors. A coincidence signal above the background generated by random bremsstrahlung coincidences would be a signature of the two-photon decay of a light neutral scalar particle. No evidence was found for such a particle with a mass near 17 keV with a lifetime shorter than 1 nanosecond. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP HICKS, KH (reprint author), OHIO UNIV,DEPT PHYS,ATHENS,OH 45701, USA. NR 9 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 20 PY 1992 VL 276 IS 4 BP 423 EP 426 DI 10.1016/0370-2693(92)91661-R PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HJ849 UT WOS:A1992HJ84900007 ER PT J AU FALLON, P NAZAREWICZ, W RILEY, MA WYSS, R AF FALLON, P NAZAREWICZ, W RILEY, MA WYSS, R TI THE INFLUENCE OF PAIRING ON THE PROPERTIES OF IDENTICAL SUPERDEFORMED BANDS IN HG NUCLEI SO PHYSICS LETTERS B LA English DT Article ID ALIGNMENT; MOMENTS; INERTIA; REGION AB Low-spin deviations in the transition energies of identical superdeformed bands in Hg nuclei are discussed in terms of variations in the moments of inertia. Blocking arguments are used to predict differences in the static pair correlations at low spins. Consequently, it is suggested that the excited two-quasiparticle superdeformed bands in Hg-194 provide a good reference for the superdeformed bands in this region. A simple expression relating the moment of inertia to pair correlations is then used to estimate the relative magnitude of the neutron pairing within these nuclei. C1 OAK RIDGE NATL LAB,HOLIFIELD HEAVY ION RES FACIL,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. WARSAW UNIV,INST THEORET PHYS,PL-00689 WARSAW,POLAND. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. RP FALLON, P (reprint author), UNIV LIVERPOOL,OLIVER LODGE LAB,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. NR 32 TC 10 Z9 10 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 20 PY 1992 VL 276 IS 4 BP 427 EP 431 DI 10.1016/0370-2693(92)91662-S PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HJ849 UT WOS:A1992HJ84900008 ER PT J AU ADAMS, DL AKCHURIN, N BELIKOV, NI BYSTRICKY, J CORCORAN, MD COSSAIRT, JD CRANSHAW, J DEREVSCHIKOV, AA ENYO, H FUNAHASHI, H GOTO, Y GRACHOV, OA GROSNICK, DP HILL, DA IMAI, K ITOW, Y IWATANI, K KRUEGER, KW KURODA, K LAGHAI, M LEHAR, F DELESQUEN, A LOPIANO, D LUEHRING, FC MAKI, T MAKINO, S MASAIKE, A MATULENKO, YA MESCHANIN, AP MICHALOWICZ, A MILLER, DH MIYAKE, K NAGAMINE, T NESSITEDALDI, F NESSI, M NGUYEN, C NURUSHEV, SB OHASHI, Y ONEL, Y PATALAKHA, DI PAULETTA, G PENZO, A READ, AL ROBERTS, JB VANROSSUM, L RYKOV, VL SAITO, N SALVATO, G SCHIAVON, P SKEENS, J SOLOVYANOV, VL SPINKA, H TAKASHIMA, R TAKEUTCHI, F TAMURA, N TANAKA, N UNDERWOOD, DG VASILIEV, AN VILLARI, A WHITE, JL YAMASHITA, S YOKOSAWA, A YOSHIDA, T ZANETTI, A AF ADAMS, DL AKCHURIN, N BELIKOV, NI BYSTRICKY, J CORCORAN, MD COSSAIRT, JD CRANSHAW, J DEREVSCHIKOV, AA ENYO, H FUNAHASHI, H GOTO, Y GRACHOV, OA GROSNICK, DP HILL, DA IMAI, K ITOW, Y IWATANI, K KRUEGER, KW KURODA, K LAGHAI, M LEHAR, F DELESQUEN, A LOPIANO, D LUEHRING, FC MAKI, T MAKINO, S MASAIKE, A MATULENKO, YA MESCHANIN, AP MICHALOWICZ, A MILLER, DH MIYAKE, K NAGAMINE, T NESSITEDALDI, F NESSI, M NGUYEN, C NURUSHEV, SB OHASHI, Y ONEL, Y PATALAKHA, DI PAULETTA, G PENZO, A READ, AL ROBERTS, JB VANROSSUM, L RYKOV, VL SAITO, N SALVATO, G SCHIAVON, P SKEENS, J SOLOVYANOV, VL SPINKA, H TAKASHIMA, R TAKEUTCHI, F TAMURA, N TANAKA, N UNDERWOOD, DG VASILIEV, AN VILLARI, A WHITE, JL YAMASHITA, S YOKOSAWA, A YOSHIDA, T ZANETTI, A TI HIGH-XT SINGLE-SPIN ASYMMETRY IN PI(0) AND ETA-PRODUCTION AT XF=0 BY 200-GEV POLARIZED ANTIPROTONS AND PROTONS SO PHYSICS LETTERS B LA English DT Article ID CONSTITUENTS; SCATTERING; GEV/C AB A measurement of the single-spin asymmetry A(N) in P up + P --> pi-0 + X at 200 GeV with x(F) = O shows a transition in the production process from a "low-x(T)" regime with A(N) = 0, through an intermediate region of negative asymmetry, to a "high-x(T)" regime with A(N) > 0.3. This transition occurs at x(T) almost-equal-to 0.4 and is consistent with x(T)-scaling of A(N) in pion production using polarized beams or targets from square-root -s = 5.2 to 19.4 GeV. Results for A(N) in eta-production by polarized protons and in pi-0 production by polarized antiprotons are also presented. C1 UNIV IOWA,DEPT PHYS,IOWA CITY,IA 52242. INST HIGH ENERGY PHYS,SERPUKHOV 142284,USSR. CENS,F-91191 GIF SUR YVETTE,FRANCE. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. KYOTO UNIV,DEPT PHYS,KYOTO 606,JAPAN. ARGONNE NATL LAB,ARGONNE,IL 60439. HIROSHIMA UNIV,HIROSHIMA 724,JAPAN. NORTHEASTERN STATE UNIV,TAHLEQUAH,OK 74464. LAB PHYS PARTICULES,F-74017 ANNECY LE VIEUX,FRANCE. NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60201. UNIV OCCUPAT & ENVIRONM HLTH,KITAKYUSHU,FUKUOKA 807,JAPAN. UNIV UDINE,I-33100 UDINE,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34100 TRIESTE,ITALY. UNIV MESSINA,DIPARTIMENTO FIS,I-98100 MESSINA,ITALY. KYOTO UNIV,KYOTO 612,JAPAN. KYOTO SANGYO UNIV,KYOTO 612,JAPAN. OKAYAMA UNIV,OKAYAMA 700,JAPAN. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. OSAKA CITY UNIV,OSAKA 558,JAPAN. RP ADAMS, DL (reprint author), RICE UNIV,TW BONNER NUCL LAB,HOUSTON,TX 77251, USA. NR 13 TC 39 Z9 39 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD FEB 20 PY 1992 VL 276 IS 4 BP 531 EP 535 DI 10.1016/0370-2693(92)91679-4 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HJ849 UT WOS:A1992HJ84900025 ER PT J AU ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B BOURDARIOS, C BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W DZHELYADIN, R EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIUKHIN, V KOURKOUMELIS, C KRAMER, PH KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIEB, E LIKO, D LILLETHUN, E LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MATVEEV, M MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEILSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OESTERBERG, K OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B BOURDARIOS, C BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W DZHELYADIN, R EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIUKHIN, V KOURKOUMELIS, C KRAMER, PH KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIEB, E LIKO, D LILLETHUN, E LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MATVEEV, M MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEILSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OESTERBERG, K OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI A MEASUREMENT OF THE BBBAR FORWARD-BACKWARD ASYMMETRY USING THE SEMILEPTONIC DECAY INTO MUONS SO PHYSICS LETTERS B LA English DT Article AB The forward-backward asymmetry of bottom quarks is measured with statistics of approximately 80 000 hadronic Z0 decays produced in e+e- collisions at a centre of mass energy of square-root s almost-equal-to M(z). The tagging of b quark events has been performed using the semileptonic decay channel b --> X + mu. Because the asymmetry depends on the weak coupling, this leads to a precise measurement of the electroweak mixing angle sin2 theta(w). The experimental result is A(FB)b = 0.115 +/- 0.043(stat.) +/- 0.013(syst.). After correcting the value for the B0B0BAR mixing this becomes A(FB)b = 0.161 +/- 0.060(stat.) +/- 0.021 (syst.) corresponding to sin2 theta(w)MSBAR = 0.221 +/- 0.011 (stat.) +/- 0.004 (syst.). C1 AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. CENS,DPHPE,F-91191 GIF SUR YVETTE,FRANCE. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. JOINT INST NUCL RES,MOSCOW 101000,USSR. CSIC,CTR MIXTE UNIV VALENCIA,INST FIS CORP,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DEPT FIS ATOM MOLEC & NUCL,E-46100 BURJASSOT,SPAIN. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV ATHENS,ATYS LAB,GR-10680 ATHENS,GREECE. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. NIKEF H,1009 DB AMSTERDAM,NETHERLANDS. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 ST MARTIN DHERES,FRANCE. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV PARIS 07,F-75230 PARIS 05,FRANCE. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. INST HIGH ENERGY PHYS,PROTVINO 142284,USSR. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CTR RECH NUCL,GRP DELPHI,DIV HAUTES ENERGIES,F-67037 STRASBOURG,FRANCE. LEPSI,F-67037 STRASBOURG,FRANCE. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV LIBRE BRUXELLES VRIJE UNIV BRUSSEL,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,SERV PHYS PARTICULES ELEMENTAIRES,B-7000 MONS,BELGIUM. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV HELSINKI,DEPT HIGH ENERGY PHYS,SF-00170 HELSINKI 17,FINLAND. UNIV OSLO,DEPT PHYS,N-1000 OSLO,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV AIX MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. RP ABREU, P (reprint author), LIP,AV ELIAS GARCIA 14,P-1000 LISBON,PORTUGAL. RI Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Marti-Garcia, Salvador/F-3085-2011; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Rovelli, Tiziano/K-4432-2015; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Zaitsev, Alexandre/B-8989-2017 OI Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Dracos, Marcos/0000-0003-0514-193X; Rovelli, Tiziano/0000-0002-9746-4842; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Zaitsev, Alexandre/0000-0002-4961-8368 NR 18 TC 21 Z9 21 U1 0 U2 8 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 20 PY 1992 VL 276 IS 4 BP 536 EP 546 DI 10.1016/0370-2693(92)91680-8 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HJ849 UT WOS:A1992HJ84900026 ER PT J AU BOWMAKER, GA GORLING, A HABERLEN, O ROSCH, N GOODMAN, GL ELLIS, DE AF BOWMAKER, GA GORLING, A HABERLEN, O ROSCH, N GOODMAN, GL ELLIS, DE TI A MOLECULAR-ORBITAL STUDY OF BONDING AND IONIZATION ENERGIES IN PENTAVALENT URANIUM IMIDE AMIDE COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID CARBON MULTIPLE-BOND; ALPHA SCATTERED-WAVE; CRYSTAL; CHEMISTRY; URANOCENE; THOROCENE; CEROCENE; LIGANDS; DONOR AB Discrete variational local density functional (X-alpha) calculations on the model complexes [(RN)U(NR2)3] (R = H (1), SiH3 (2)) have been performed in order to investigate the electronic structure of uranium amido/imido complexes. Special emphasis is placed on the energy ordering of the highest lying levels formed by U 5f orbitals and by out-of-plane N 2p(pi) orbitals. Orbital relaxations are also estimated by studying the fragments NR and NR2 with R = H and R = SiMe3 in order to allow a comparison of the model compounds 1 and 2 with the measured photoelectron spectrum of the complex {(Me3SiN)U(SiMe3)2T3}. The ionization energies corresponding to the N 2p(pi) MOs are calculated in the order N 2p(pi) (amido) < N 2p(pi) (imido). The calculated level ordering is rationalized by comparing the order of the two types of U-N bonds and the charge distributions of the corresponding ligands. Taking the calculated ordering as well as the character of the molecular orbitals into account, a new assignment of the observed photoelectron spectra is given based on a comparison of He I and He II spectra. C1 TECH UNIV MUNICH,LEHRSTUHL THEORET CHEM,W-8046 GARCHING,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60201. UNIV AUCKLAND,DEPT CHEM,AUCKLAND,NEW ZEALAND. RI Roesch, Notker/C-1182-2010 NR 33 TC 6 Z9 6 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD FEB 19 PY 1992 VL 31 IS 4 BP 577 EP 581 DI 10.1021/ic00030a010 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HF014 UT WOS:A1992HF01400010 ER PT J AU MAIENSCHEIN, FC PEELLE, RW AF MAIENSCHEIN, FC PEELLE, RW TI RADIATION DOSAGE ESTIMATION AND HEALTH RISK SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter RP MAIENSCHEIN, FC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD FEB 19 PY 1992 VL 267 IS 7 BP 929 EP 929 DI 10.1001/jama.267.7.929 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA HD155 UT WOS:A1992HD15500008 PM 1734096 ER PT J AU WING, S SHY, CM WOOD, JL CRAGLE, DL AF WING, S SHY, CM WOOD, JL CRAGLE, DL TI RADIATION DOSAGE ESTIMATION AND HEALTH RISK - REPLY SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter C1 OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830. RP WING, S (reprint author), UNIV N CAROLINA,SCH PUBL HLTH,CHAPEL HILL,NC 27514, USA. NR 3 TC 3 Z9 3 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD FEB 19 PY 1992 VL 267 IS 7 BP 929 EP 930 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA HD155 UT WOS:A1992HD15500009 ER PT J AU SOSNICK, TR BENJAMIN, DC NOVOTNY, J SEEGER, PA TREWHELLA, J AF SOSNICK, TR BENJAMIN, DC NOVOTNY, J SEEGER, PA TREWHELLA, J TI DISTANCES BETWEEN THE ANTIGEN-BINDING SITES OF 3 MURINE ANTIBODY SUBCLASSES MEASURED USING NEUTRON AND X-RAY-SCATTERING SO BIOCHEMISTRY LA English DT Article ID SMALL-ANGLE SCATTERING; IMMUNOGLOBULIN MOLECULE KOL; 3-DIMENSIONAL STRUCTURE; SEGMENTAL FLEXIBILITY; CRYSTALLOGRAPHIC REFINEMENT; ATOMIC MODELS; TROPONIN-C; RESOLUTION; CALMODULIN; FRAGMENT AB For three different murine immunoglobulins (IgG subclasses 1, 2a, and 2b), the distances between their antigen-binding sites have been measured using neutron scattering from deuterated antigens complexed with proteated IgG. Neutron-scattering data were measured for each antibody-antigen complex in a 41% D2O solvent. Unlike the proteated antibody molecule, the deuterated antigens are strongly contrasted against the 41% D2O solvent and give rise to a scattering profile that contains an interference term related to the distance between the deuterated antigens. For all three subclasses, the damping of this interference term, which gives information on the relative flexibility of the antigen-binding sites, indicates that a single distance is inadequate to describe the observed scattering and a distribution of distances is needed. The scattering profile has been modeled for each subclass to give the mean distance between the antigens and the variance of this distance. For all three IgG subclasses, the mean distance is between 117 and 134 angstrom, and the variance is large (almost-equal-to 40 angstrom), indicating a high degree of flexibility of the F(ab) arms. Small-angle X-ray scattering measurements on the same samples are consistent with the neutron-scattering results. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. BRISTOL MYERS SQUIBB,RES INST,DEPT MACROMOLEC MODELING,PRINCETON,NJ 08543. UNIV CALIF LOS ALAMOS SCI LAB,LANSCE,LOS ALAMOS,NM 87545. UNIV VIRGINIA,DEPT MICROBIOL,CHARLOTTESVILLE,VA 22908. FU NIAID NIH HHS [AI20745] NR 38 TC 19 Z9 19 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 18 PY 1992 VL 31 IS 6 BP 1779 EP 1786 DI 10.1021/bi00121a028 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HE194 UT WOS:A1992HE19400028 PM 1737031 ER PT J AU VENKATASUBRAMANIAN, R TIMMONS, ML HUMPHREYS, TP KEYES, BM AHRENKIEL, RK AF VENKATASUBRAMANIAN, R TIMMONS, ML HUMPHREYS, TP KEYES, BM AHRENKIEL, RK TI HIGH-QUALITY EUTECTIC-METAL-BONDED ALGAAS-GAAS THIN-FILMS ON SI SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID REDUCTION AB Device quality GaAs-AlGaAs thin films have been obtained on Si substrates, using a novel approach called eutectic-metal-bonding (EMB). This involves the lattice-matched growth of GaAs-AlGaAs thin films on Ge substrates, followed by bonding onto a Si wafer. The Ge substrates are selectively removed by a CF4/O2 plasma etch, leaving high-quality GaAs-AlGaAs thin films on Si substrates. We have obtained a minority-carrier lifetime of 103 ns in a EMB GaAs-AlGaAs double heterostructure on Si, which is nearly forty times higher than the state-of-the-art lifetime for heteroepitaxial GaAs on Si, and represents the largest reported minority-carrier lifetime for a freestanding GaAs thin film. In addition, a negligible residual elastic strain in the EMB GaAs-AlGaAs films has been determined from Raman spectroscopy measurements. C1 N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP VENKATASUBRAMANIAN, R (reprint author), RES TRIANGLE INST,RES TRIANGLE PK,NC 27709, USA. NR 15 TC 12 Z9 12 U1 1 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 17 PY 1992 VL 60 IS 7 BP 886 EP 888 DI 10.1063/1.106494 PG 3 WC Physics, Applied SC Physics GA HD748 UT WOS:A1992HD74800033 ER PT J AU MALBA, V BERNHARDT, AF AF MALBA, V BERNHARDT, AF TI LASER SURFACE MODIFICATION FOR SELECTIVE ELECTROPLATING OF METAL - A 2.5 M/S LASER DIRECT WRITE PROCESS SO APPLIED PHYSICS LETTERS LA English DT Article ID COPPER; DEPOSITION; LINES; FILMS AB A very fast laser direct write process is described. The process involves laser modification of an insulating seed multilayer to form a conducting surface which can be electroplated. The seed layer is composed of an adhesion layer of TiW, a conducting layer of Au, and a top insulating layer of alpha-Si. The laser forms a Au-Si mixture without substantially affecting the adhesion layer. Writing speeds of 2.5 m/s have been demonstrated. The laser patterning can be performed in air, and the process works over a broad range of laser power (P(max)/P(min) approximately 5). RP MALBA, V (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,M-S L271,LIVERMORE,CA 94550, USA. NR 20 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 17 PY 1992 VL 60 IS 7 BP 909 EP 911 DI 10.1063/1.106501 PG 3 WC Physics, Applied SC Physics GA HD748 UT WOS:A1992HD74800041 ER PT J AU JERVIS, TR NASTASI, M HUBBARD, KM AF JERVIS, TR NASTASI, M HUBBARD, KM TI EXCIMER LASER MIXING OF TI LAYERS ON SI3N4 CERAMIC SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID SURFACE MODIFICATION; MICROSTRUCTURE; CARBIDE; FILMS AB We have used pulsed excimer laser radiation at 248 nm to mix Ti layers into Si3N4 substrates. Mixed layers show formation of small grain TiN in a Si3N4 but no evidence of Ti-Si compounds or free Si. Low fluence (approximately 1.0 J cm-2) processing results in minimal mixing as TiN formation at the interface impedes further diffusion. At higher fluence (> 2 J cm-2) complete and quite uniform mixing occurs. The mixed layer is of the order of 0.5-mu-m thick. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP JERVIS, TR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT,LOS ALAMOS,NM 87545, USA. NR 19 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 17 PY 1992 VL 60 IS 7 BP 912 EP 914 DI 10.1063/1.107436 PG 3 WC Physics, Applied SC Physics GA HD748 UT WOS:A1992HD74800042 ER PT J AU NAGASAWA, M YOKOYAMA, J AF NAGASAWA, M YOKOYAMA, J TI PHASE-TRANSITIONS TRIGGERED BY QUANTUM FLUCTUATIONS IN THE INFLATIONARY UNIVERSE SO NUCLEAR PHYSICS B LA English DT Article ID COSMIC STRINGS; SITTER SPACE; SCALAR FIELD; COSMOLOGY AB The dynamics of a second-order phase transition during inflation, which is induced by time variation of space-time curvature, is studied as a natural mechanism to produce topological defects of typical grand unification scales such as cosmic strings or global textures. It is shown that their energy distribution is almost scale invariant with small- and large-scale cutoffs. Also discussed is how these cutoffs are given. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP NAGASAWA, M (reprint author), UNIV TOKYO,FAC SCI,DEPT PHYS,TOKYO 113,JAPAN. NR 34 TC 23 Z9 23 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 17 PY 1992 VL 370 IS 2 BP 472 EP 490 DI 10.1016/0550-3213(92)90294-L PG 19 WC Physics, Particles & Fields SC Physics GA HH071 UT WOS:A1992HH07100009 ER PT J AU KERSTEIN, AR ASHURST, WT AF KERSTEIN, AR ASHURST, WT TI PROPAGATION RATE OF GROWING INTERFACES IN STIRRED FLUIDS SO PHYSICAL REVIEW LETTERS LA English DT Article ID TURBULENT TRANSPORT; FLAME PROPAGATION AB The overall propagation rate of growing interfaces subject to weak random stirring is investigated, based on a variant of the Kardar-Parisi-Zhang equation. Scaling analysis, supported by computations, indicates that random stirring increases the overall propagation rate in proportion to the 4/3 power of the ratio of stirring rate to growth rate. The generally assumed quadratic dependence on this ratio is valid only for special cases such as periodic flow. On this basis, a modified turbulent-flame speed formula is proposed. Implications concerning interpretation of measurements are noted. RP KERSTEIN, AR (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 12 TC 52 Z9 52 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 17 PY 1992 VL 68 IS 7 BP 934 EP 937 DI 10.1103/PhysRevLett.68.934 PG 4 WC Physics, Multidisciplinary SC Physics GA HE195 UT WOS:A1992HE19500010 ER PT J AU KIM, DS BOUCHALKHA, A JACOB, JM ZHOU, JF SONG, JJ KLEM, JF AF KIM, DS BOUCHALKHA, A JACOB, JM ZHOU, JF SONG, JJ KLEM, JF TI CONFINED-TO-PROPAGATING TRANSITION OF LO PHONONS IN GAAS/ALXGA1-XAS SUPERLATTICES OBSERVED BY PICOSECOND RAMAN-SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAAS-ALAS SUPERLATTICES; QUANTUM-WELL STRUCTURES; OPTICAL PHONONS; GAAS/ALAS SUPERLATTICES; INTERSUBBAND RELAXATION; GAAS-ALXGA1-XAS; SPECTROSCOPY; MODES; VIBRATIONS; ALXGA1-XAS AB We report the first observation of a confined-to-propagating transition of LO phonons in GaAs/AlxGa1-xAs superlattices (SL's). Our samples are two series of SL's with constant GaAs layer widths (L(z)) and x, while the AlxGa1-xAs layer widths (L(b)'s) varied. Using picosecond Raman scattering, we have observed a sudden increase in the generation rate of the Raman-active hot phonons as L(b) decreased over a narrow range for both series of samples. We demonstrate that this abrupt increase is due to the sharp transition from the so-called confined to the propagating LO phonons. From our results we have determined the GaAs LO phonon penetration depth into the AlxGa1-xAs layers. C1 OKLAHOMA STATE UNIV,CTR LASER RES,STILLWATER,OK 74078. OKLAHOMA STATE UNIV,DEPT PHYS,STILLWATER,OK 74078. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 32 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 17 PY 1992 VL 68 IS 7 BP 1002 EP 1005 DI 10.1103/PhysRevLett.68.1002 PG 4 WC Physics, Multidisciplinary SC Physics GA HE195 UT WOS:A1992HE19500027 ER PT J AU HAYDEN, SM LANDER, GH ZARESTKY, J BROWN, PJ STASSIS, C METCALF, P HONIG, JM AF HAYDEN, SM LANDER, GH ZARESTKY, J BROWN, PJ STASSIS, C METCALF, P HONIG, JM TI INCOMMENSURATE MAGNETIC CORRELATIONS IN LA1.8SR0.2NIO4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID DOPED LA2CUO4; ANTIFERROMAGNET; SPIN AB Neutron scattering experiments on an insulating single crystal of La1.8Sr0.2NiO4 show the presence of strong two-dimensional incommensurate magnetic correlations in the NiO2 planes. At low temperatures, T = 2 K, these exist on time scales tau > 10(-11) s. The typical side length of the correlated regions in the direction parallel to the incommensurate modulation is equal to the average spacing between strontium atoms. C1 COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,W-7500 KARLSRUHE,GERMANY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. RP HAYDEN, SM (reprint author), UNIV BRISTOL,HH WILLS PHYS LAB,TYNDALL AVE,BRISTOL BS8 1TL,AVON,ENGLAND. RI Hayden, Stephen/F-4162-2011 OI Hayden, Stephen/0000-0002-3209-027X NR 24 TC 112 Z9 113 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 17 PY 1992 VL 68 IS 7 BP 1061 EP 1064 DI 10.1103/PhysRevLett.68.1061 PG 4 WC Physics, Multidisciplinary SC Physics GA HE195 UT WOS:A1992HE19500042 ER PT J AU YEH, L AF YEH, L TI GENERALIZATION OF THE INTEGRATION-WITHIN-ORDERED-PRODUCT TECHNIQUE TO N-MODE OPERATOR ORDERING SO PHYSICS LETTERS A LA English DT Article ID SQUEEZE OPERATORS; SPACE AB Integration within an ordered product (IWOP) is a technique for calculating normally ordered forms of unitary operators which induce symplectic transformations. This technique is modified and generalized to general n-mode cases. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV PHYS, BERKELEY, CA 94720 USA. RP YEH, L (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 11 TC 3 Z9 3 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 EI 1873-2429 J9 PHYS LETT A JI Phys. Lett. A PD FEB 17 PY 1992 VL 162 IS 4 BP 294 EP 298 DI 10.1016/0375-9601(92)90019-I PG 5 WC Physics, Multidisciplinary SC Physics GA HF803 UT WOS:A1992HF80300002 ER PT J AU HAWTHORNE, SB MILLER, DJ NIVENS, DE WHITE, DC AF HAWTHORNE, SB MILLER, DJ NIVENS, DE WHITE, DC TI SUPERCRITICAL FLUID EXTRACTION OF POLAR ANALYTES USING INSITU CHEMICAL DERIVATIZATION SO ANALYTICAL CHEMISTRY LA English DT Article ID TRIMETHYLANILINIUM HYDROXIDE; ORGANIC-ACIDS; CHROMATOGRAPHY; METHYLATION; RESIDUES; PHENOLS AB Analytical-scale supercritical fluid extraction (SFE) of polar organics from solid samples was enhanced by derivatizing the analytes to less polar species under static SFE conditions using reagents including trimethylphenylammonium hydroxide and boron trifluoride in methanol. After derivatization, the analytes were extracted with CO2 using standard SFE techniques and analyzed without additional treatment using conventional capillary GC. Total time for derivatization and extraction can be < 30 min; however some samples which contained high concentrations of reactive matrix components required multiple derivatization/extraction steps to achieve quantitative recoveries. The development and application of derivatization/SFE methods for the quantitative (> 90%) derivatization and extraction recoveries of native and spiked acid herbicides ((2,4-dichlorophenoxy)acetic acid and Dicamba) from soil and sediment, microbial phospholipid fatty acids (as their methyl esters) from whole cells, and wastewater phenolics (as their methyl ethers) from water and from C18 sorbent disks is presented. C1 UNIV TENNESSEE,INST APPL MICROBIOL,KNOXVILLE,TN 37932. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37932. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37932. RP HAWTHORNE, SB (reprint author), UNIV N DAKOTA,ENERGY & ENVIRONM RES CTR,GRAND FORKS,ND 58202, USA. NR 25 TC 136 Z9 140 U1 0 U2 16 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 15 PY 1992 VL 64 IS 4 BP 405 EP 412 DI 10.1021/ac00028a015 PG 8 WC Chemistry, Analytical SC Chemistry GA HE081 UT WOS:A1992HE08100015 ER PT J AU PENNYCOOK, SJ AF PENNYCOOK, SJ TI ATOMIC-SCALE IMAGING OF MATERIALS BY Z-CONTRAST SCANNING-TRANSMISSION ELECTRON-MICROSCOPY SO ANALYTICAL CHEMISTRY LA English DT Article ID YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES; MICROANALYSIS RP PENNYCOOK, SJ (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 22 TC 1 Z9 1 U1 2 U2 7 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 15 PY 1992 VL 64 IS 4 BP A263 EP A272 DI 10.1021/ac00028a001 PG 10 WC Chemistry, Analytical SC Chemistry GA HE081 UT WOS:A1992HE08100001 ER PT J AU KAUFMANN, WB GIBBS, WR AF KAUFMANN, WB GIBBS, WR TI ISOSPIN-SYMMETRY BREAKING IN THE PI-N SYSTEM SO ANNALS OF PHYSICS LA English DT Article ID CHARGE ASYMMETRY; SCATTERING; EXCHANGE C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KAUFMANN, WB (reprint author), ARIZONA STATE UNIV,TEMPE,AZ 85287, USA. NR 10 TC 10 Z9 10 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD FEB 15 PY 1992 VL 214 IS 1 BP 84 EP 101 DI 10.1016/0003-4916(92)90062-Q PG 18 WC Physics, Multidisciplinary SC Physics GA HG910 UT WOS:A1992HG91000003 ER PT J AU ADVANI, R RUBIN, E MOHANDAS, N SCHRIER, SL AF ADVANI, R RUBIN, E MOHANDAS, N SCHRIER, SL TI OXIDATIVE RED-BLOOD-CELL MEMBRANE INJURY IN THE PATHOPHYSIOLOGY OF SEVERE MOUSE BETA-THALASSEMIA SO BLOOD LA English DT Article ID ERYTHROCYTE-MEMBRANES; GLOBIN C1 STANFORD UNIV,MED CTR,SCH MED,DEPT MED HEMATOL,DIV HEMATOL,S-161,300 PASTEUR DR,STANFORD,CA 94305. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NIDDK NIH HHS [DK13682, DK26263, DK32094] NR 11 TC 36 Z9 36 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD FEB 15 PY 1992 VL 79 IS 4 BP 1064 EP 1067 PG 4 WC Hematology SC Hematology GA HD660 UT WOS:A1992HD66000032 PM 1737090 ER PT J AU FRANKENBACH, GM BENO, MA KINI, AM WILLIAMS, JM WELP, U THOMPSON, JE WHANGBO, MH AF FRANKENBACH, GM BENO, MA KINI, AM WILLIAMS, JM WELP, U THOMPSON, JE WHANGBO, MH TI STRUCTURAL, ELECTRONIC AND MAGNETIC-PROPERTIES OF THE METAL SQUARATE TETRAHYDRATE POLYMERS FE(C4O4)BULLET-4H2O AND CU(C4O4)BULLET-4H2O SO INORGANICA CHIMICA ACTA LA English DT Article ID CRYSTAL-STRUCTURE; RUTHENIUM; IRON AB Iron(II) squarate tetrahydrate (1), M(r) = 239.95, Fe(C4O4).4H2O, crystallizes having a monoclinic space group = C2/c, a = 9.066(3), b = 13.417(3), c = 6.777(2) angstrom, beta = 98.77(2)-degrees, V = 814.8(4) angstrom 3, Z = 4, D(x) = 1.956(1) g cm-3, lambda(Mo K-alpha) = 0.71073, lambda = 18.613 cm-1, F(000) = 488, T = 300 K, R = 0.025, R(w) = 0.028, for 687 observed reflections with \F(o)\ > 0. Copper(II) squarate tetrahydrate (2), M(r) = 247.65, Cu(C4O4).4H2O, crystallizes having a monoclinic space group = P2(1)/c, a = 6.676(2), b = 7.946(4), c = 7.688(2) angstrom, beta = 110.39(2)-degrees, V = 381.4(3) angstrom 3, Z = 2, D(x) = 2.157(2) g cm-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 28.833 cm-1, F(000) = 250, T = 300 K, R = 0.025, R(w) = 0.028, for 627 observed reflections with \F(o)\ > 0. Extended Huckel molecular orbital (EHMO) calculations on model clusters, [Fe(OH)4(C4O4)2]6- and [Cu(OH)4(C4O4)2]6-, indicate that 1 and 2 are not good candidates for polymeric electrical conduction, because overlap between the metal and the squarate orbitals is negligible in the HOMO and LUMO of the model clusters. In addition, EHMO calculations suggest that the electronic forces cannot account for the structural differences found between 1 and 2. The magnetic susceptibility of 2, measured as a function of temperature, suggests that magnetic spins do not interact via the squarate anion bridges. C1 ARGONNE NATL LAB,DIV CHEM & MAT SCI,9700 CASS AVE,ARGONNE,IL 60439. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. RI Kini, Aravinda/F-4467-2012 NR 15 TC 49 Z9 49 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD FEB 15 PY 1992 VL 192 IS 2 BP 195 EP 200 DI 10.1016/S0020-1693(00)80759-8 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HT935 UT WOS:A1992HT93500009 ER PT J AU HEBNER, GA HAYS, GN AF HEBNER, GA HAYS, GN TI PARAMETRIC INVESTIGATION OF THE FISSION-FRAGMENT EXCITED HELIUM-ARGON LASER AT 1.79 MU-M SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ATOMIC XENON AB Characteristics of the fission-fragment excited helium/argon laser operating on the 1.79-mu-m (3d[1/2]0,1(0) - 4p[3/2]1,2 argon transition are presented. Laser output occurs for approximately 80% of the 0.9 to 3 ms full width at half maximum thermal neutron pump pulse. Output power efficiency optimizes for a total gas pressure of 760 Torr and argon concentration of 0.3% to 2.0%. Power efficiency was 1.4% +/- 0.4% for instantaneous pump rates of 45 to 230 W/cm3. The small signal gain and saturation intensity for instantaneous pump rates of 30 to 90 W/cm3 are 0.55% to 1.05%/cm and 70 to 110 W/cm2, respectively. The laser threshold as a function of helium pressure and argon concentration will be presented. The advantages of fission-fragment excitation in predominantly helium gas mixtures will be discussed. RP HEBNER, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 30 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1992 VL 71 IS 4 BP 1610 EP 1616 DI 10.1063/1.351217 PG 7 WC Physics, Applied SC Physics GA HE698 UT WOS:A1992HE69800007 ER PT J AU HIXSON, RS FRITZ, JN AF HIXSON, RS FRITZ, JN TI SHOCK COMPRESSION OF TUNGSTEN AND MOLYBDENUM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ALUMINUM; COPPER AB New high-pressure shock-wave data have been obtained for W and Mo. These data have been combined with previous data sets for these materials to extend the range of linear u(s)-u(p) fits for the Hugoniot to 480 GPa for Mo and 680 GPa for W. The shock-wave data, supplemented by the necessary thermodynamic information, have been used to generate several isotherms (100, 200,...1000 K). Tables of pressure versus relative volume up to 380 GPa suitable for comparison with statically obtained data are given. RP HIXSON, RS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 137 Z9 149 U1 2 U2 13 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1992 VL 71 IS 4 BP 1721 EP 1728 DI 10.1063/1.351203 PG 8 WC Physics, Applied SC Physics GA HE698 UT WOS:A1992HE69800021 ER PT J AU JANKOWSKI, AF AF JANKOWSKI, AF TI MEASUREMENT OF LATTICE STRAIN IN AU-NI MULTILAYERS AND CORRELATION WITH BIAXIAL MODULUS EFFECTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID METALLIC SUPERLATTICES; ELASTIC-MODULUS; GOLD-NICKEL; THIN-FILMS; PALLADIUM; FOILS AB Measurement of lattice strain within each atomic plane of sputter-deposited, gold-nickel multilayer films is accomplished using x-ray diffraction and high resolution electron microscopy. Experimental determination of strain along the composition modulation direction [1 - 1 1] from x-ray diffraction scans fit to dynamical theory compare well with values measured from high-resolution electron micrographs and selected-area-diffraction patterns. The measured strain in-plane (2 2 0) and along the composition modulation (1 - 1 1) reveal the gold layers to be in compression and the nickel layers in tension. The experimental strain values are used within the framework of the "coherency strain model" to predict an enhancement of the biaxial elastic modulus Y(111), which is in good agreement with the original experimental measurements on thermal-evaporated films. RP JANKOWSKI, AF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV MAT,POB 808,LIVERMORE,CA 94550, USA. NR 21 TC 27 Z9 29 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1992 VL 71 IS 4 BP 1782 EP 1789 DI 10.1063/1.351214 PG 8 WC Physics, Applied SC Physics GA HE698 UT WOS:A1992HE69800032 ER PT J AU SAMARA, GA VOOK, DW GIBBONS, JF AF SAMARA, GA VOOK, DW GIBBONS, JF TI DEEP ELECTRONIC LEVELS AT GROWTH INTERRUPTED INTERFACES IN LOW-TEMPERATURE-GROWN GAAS AND THE PRESSURE-DEPENDENCE OF THESE LEVELS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DEFORMATION POTENTIALS; HYDROSTATIC-PRESSURE; EL2 DEFECT; SEMICONDUCTORS; SILICON; IDENTIFICATION; TRAPS AB Deep electronic energy levels associated with defects confined to interrupted growth interfaces of thin GaAs layers grown by low-temperature (720 K) metalorganic chemical vapor deposition using tertiarybutylarsine and subsequently annealed at 920 K for about 2 min were investigated by transient capacitance spectroscopy at both atmospheric pressure (1 bar) and hydrostatic pressures to 8 kbar. Samples grown under widely different As/Ga ratios in the gas phase were compared, and this ratio was found to have a strong influence on the levels observed. Most of these levels are characteristic of levels seen in GaAs grown from the vapor phase. Analysis of the pressure dependencies of the electron emission rates and capture cross sections shows that most of the levels move higher in energy with pressure and yields the activation volume which accompanies electron emission or capture. These features are unique signatures of the levels and provide new insights into the physics involved. One of the levels is identified as the midgap donor EL2. Its energy exhibits a relatively large increase with pressure, and a large inward (outward) volume relaxation accompanies electron emission (capture) of electrons from (by) it. C1 STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305. RP SAMARA, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 28 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1992 VL 71 IS 4 BP 1807 EP 1814 DI 10.1063/1.351187 PG 8 WC Physics, Applied SC Physics GA HE698 UT WOS:A1992HE69800036 ER PT J AU KAPRAL, R LAWNICZAK, A MASIAR, P AF KAPRAL, R LAWNICZAK, A MASIAR, P TI REACTIVE DYNAMICS IN A MULTISPECIES LATTICE-GAS AUTOMATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS; SYSTEMS; INSTABILITIES; OSCILLATIONS; EQUATIONS; PATTERNS AB A multispecies reactive lattice-gas automaton model is constructed and used to study chemical oscillations and pattern formation processes in a spatially distributed two-dimensional medium. Both steady state and oscillatory dynamics are explored. Nonequilibrium spatial structures are also investigated. The automation simulations show the formation of rings of chemical excitation, spiral waves, and Turing patterns. Since the automaton model treats the dynamics at a mesoscopic level, fluctuations are included and nonequilibrium spatial structures can be investigated at a deeper level than reaction-diffusion equation descriptions. C1 UNIV GUELPH,DEPT MATH & STAT,GUELPH N1G 2W1,ONTARIO,CANADA. UNIV CALIF LOS ALAMOS SCI LAB,CNLS,LOS ALAMOS,NM 87545. UNIV TORONTO,ONTARIO CTR LARGE SCALE COMPUTAT,TORONTO M5S 1A1,ONTARIO,CANADA. RP KAPRAL, R (reprint author), UNIV TORONTO,DEPT CHEM,CHEM PHYS THEORY GRP,TORONTO M5S 1A1,ONTARIO,CANADA. NR 46 TC 36 Z9 36 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 15 PY 1992 VL 96 IS 4 BP 2762 EP 2776 DI 10.1063/1.462025 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HE743 UT WOS:A1992HE74300035 ER PT J AU SUITS, AG HOU, H DAVIS, HF LEE, YT AF SUITS, AG HOU, H DAVIS, HF LEE, YT TI REACTION DYNAMICS FROM ORBITAL ALIGNMENT DEPENDENCE AND ANGULAR-DISTRIBUTIONS OF IONS PRODUCED IN COLLISION OF BA(P-1) WITH NO2 AND O-3 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CROSSED-BEAM; CHEMILUMINESCENCE; ATOMS AB Angular distributions, orbital alignment dependence, and energy dependence of the relative cross sections of various ions produced in crossed beams collisions of electronically excited barium with O3 and NO2 were used to explore the dynamics of these reactions. The Ba+ product from both reactions showed strong dependence on alignment of the Ba(1P) p orbital with respect to the relative velocity vector. The Ba+ was generally forward or forward-sideways scattered, with the latter favored by the dominant perpendicular orbital alignment. Similar results for Ba+ from both O3 and NO2 suggest that electron transfer is favored for large impact parameter collisions in which the Ba p orbital is directed toward the molecule at the critical configuration, regardless of the symmetry of the available orbital in the isolated molecule. BaO2+ from the O3 reaction exhibited angular distributions and energy dependences which were reminiscent of the Ba+, albeit 2 orders of magnitude lower in intensity, indicating a close relationship between these two channels. Important differences in the dynamics for the BaO+ channel were suggested in the angular distributions, which show a substantial backscattered component, as well as the alignment effects and energy dependence. These indicate that the BaO+ probably derives from neutral BaO* which is sufficiently internally excited to undergo vibrational autoionization. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP SUITS, AG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 39 TC 15 Z9 15 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 1992 VL 96 IS 4 BP 2777 EP 2785 DI 10.1063/1.462026 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HE743 UT WOS:A1992HE74300036 ER PT J AU CHO, SW WAGNER, AF GAZDY, B BOWMAN, JM AF CHO, SW WAGNER, AF GAZDY, B BOWMAN, JM TI THEORETICAL-STUDIES OF THE REACTIVITY AND SPECTROSCOPY OF H+CO REVERSIBLE HCO .1. STABILIZATION AND SCATTERING STUDIES OF RESONANCES FOR J=0 ON THE HARDING ABINITIO SURFACE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID H + CO; HYDROGEN-ATOMS; ROTATIONAL DISTRIBUTIONS; COLLISIONS; DISSOCIATION; EXCITATION; EQUATIONS; ENERGY; SYSTEM; MATRIX AB We report stabilization and coupled-channel scattering calculations of isolated resonances for a triatomic molecule HCO using a global, ab initio potential energy surface. The lowest nine resonances are identified for total angular momentum J = 0. The two set of calculations agree closely with each other on the resonance locations which are then compared to experimentally determined locations. These resonances show widths varying 10(-6) to 10(0) cm-1. Pictures of resonance wave functions are presented for the proper assignment of quantum numbers of resonance states. A simple technique for locating very narrow resonances in scattering calculations is presented and a worked example shows large savings of computational efforts for scattering calculations. Partial widths and resonance lifetimes are obtained by analysis of the S matrices. Final state distribution probabilities are presented for resonance and direct scattering and the characteristics of this scattering are discussed. C1 EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322. RP CHO, SW (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 39 TC 42 Z9 42 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 15 PY 1992 VL 96 IS 4 BP 2799 EP 2811 DI 10.1063/1.461976 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HE743 UT WOS:A1992HE74300038 ER PT J AU CHO, SW WAGNER, AF GAZDY, B BOWMAN, JM AF CHO, SW WAGNER, AF GAZDY, B BOWMAN, JM TI ISOLATED RESONANCE DECOMPOSITION OF A MULTICHANNEL S-MATRIX - A TEST FROM THE SCATTERING OF H+CO REVERSIBLE HCO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COLLISIONS; RRKM AB We report a full test of the decomposition of a multichannel S matrix in the case of isolated resonances by analysis of coupled-channel scattering calculations for H + CO reversible HCO with zero total angular momentum on a realistic potential energy surface. The decomposition of S into resonant and a nonresonant matrices [K. W. McVoy, in Fundamentals in Nuclear Theory, edited by A. de-Shalit and C. Villi (International Atomic Energy Agency, Vienna, 1967) and B. Gazdy and J. M. Bowman, Phys. Rev. A 36, 3083 (1987)] developed in the limit of an infinitely narrow isolated resonance is applied to the nine calculated resonances determined in the first 1200 cm-1 of collision energy. These resonances have widths varing from 10(-6) to 10(0) cm-1. Time-reversal, conservation, orthogonality and energy-dependence properties of the resulting decomposed matrices are compared to theoretical expectations. The effect on these comparisons of a six order of magnitude variation in resonance width is examined. The special role of orthogonality properties in setting limits to decay distributions without specific knowledge of resonance location or width is discussed. C1 EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322. RP CHO, SW (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 18 TC 17 Z9 17 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 1992 VL 96 IS 4 BP 2812 EP 2818 DI 10.1063/1.461977 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HE743 UT WOS:A1992HE74300039 ER PT J AU FRANCISCO, JS ZHAO, Y LESTER, WA WILLIAMS, IH AF FRANCISCO, JS ZHAO, Y LESTER, WA WILLIAMS, IH TI THEORETICAL-STUDIES OF THE STRUCTURE AND THERMOCHEMISTRY OF FO2 RADICAL - COMPARISON OF MOLLER-PLESSET PERTURBATION, COMPLETE-ACTIVE-SPACE SELF-CONSISTENT-FIELD, AND QUADRATIC CONFIGURATION-INTERACTION METHODS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-ORBITAL METHODS; FLUORINE PEROXIDE FOOF; SPECTRUM; KINETICS; ABINITIO; ENERGIES; LASER; F2O2 AB The structure of FO2 has been calculated for the X2A" ground state using Moller-Plesset (MP) perturbation, complete-active-space self-consistent-field (CASSCF), and quadratic configuration interaction (QCI) ab initio molecular orbital methods. Basis sets with polarization and diffuse functions were used. Compared with the experimental structure, bond lengths obtained with MP perturbation methods are found to be consistently too short. CASSCF calculations yield a structure which varies considerably with the size of the active space and basis set used. Calculations using the single-configuration-based QCI in the single and double-space with perturbative inclusion of triple substitutions, denoted by QCISD (T), yield structures very close to the experimental structure of FO2. The thermochemistry of FO2 radical has been calculated using the MP, QCI, and GAUSSIAN-1 (G1) methods. The QCI method using isodesmic and isogyric schemes has predicted the heat of formation for FO2 at 0 K to be 8.9 +/- 3 kcal mol-1. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV BATH,DEPT CHEM,BATH BA2 7AY,AVON,ENGLAND. RP FRANCISCO, JS (reprint author), WAYNE STATE UNIV,DEPT CHEM,DETROIT,MI 48202, USA. RI Williams, Ian/A-7598-2012 NR 43 TC 34 Z9 34 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1992 VL 96 IS 4 BP 2861 EP 2867 DI 10.1063/1.461982 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HE743 UT WOS:A1992HE74300045 ER PT J AU SCHWEIZER, KS HONNELL, KG CURRO, JG AF SCHWEIZER, KS HONNELL, KG CURRO, JG TI REFERENCE INTERACTION SITE MODEL-THEORY OF POLYMERIC LIQUIDS - SELF-CONSISTENT FORMULATION AND NONIDEALITY EFFECTS IN DENSE SOLUTIONS AND MELTS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID INTEGRAL-EQUATION THEORY; MICROPHASE SEPARATION TRANSITION; MOLECULAR-DYNAMICS SIMULATION; EXCESS ELECTRONS; SIMPLE FLUIDS; NEUTRON-SCATTERING; BLENDS; COPOLYMER; MIXTURES; SOLVENT AB The reference interaction site model (RISM) integral-equation approach to polymeric liquids is generalized to allow a self-consistent determination of single-chain and intermolecular pair correlations. Nonlinear medium-induced effects on intrachain statistics are described at the level of self-consistent pair interactions. Tractable schemes to implement the self-consistency aspect are formulated for semiflexible and rotational isomeric state chain models, and applied numerically to concentrated solutions and melts of semiflexible polymers. Theoretical results are in good agreement with off-lattice molecular dynamics simulations, and a rich dependence of the renormalized persistence length on temperature, aspect ratio, density, and degree of polymerization is found. The general formalism for polymer alloys is sketched and the potentially important role of local density and concentration fluctuations as nonuniversal mechanisms for inducing conformational perturbations is emphasized. A detailed analysis is made of the connections between the polymer RISM integral-equation theory and the field theoretic psuedopotential formalism, and remarkable similarities in the predictions of the two distinct approaches for solutions of long thread-like polymers are demonstrated. C1 UNIV ILLINOIS,DEPT CHEM,URBANA,IL 61801. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SCHWEIZER, KS (reprint author), UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801, USA. NR 65 TC 101 Z9 101 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 1992 VL 96 IS 4 BP 3211 EP 3225 DI 10.1063/1.461965 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HE743 UT WOS:A1992HE74300083 ER PT J AU PRUSKI, M SANDERS, DK KING, TS GERSTEIN, BC AF PRUSKI, M SANDERS, DK KING, TS GERSTEIN, BC TI EXPERIMENTAL-METHOD FOR LOW-TEMPERATURE REACTION STUDIES IN SEALED SAMPLES BY C-13 CP MAS NMR SO JOURNAL OF MAGNETIC RESONANCE LA English DT Article ID SOLID-STATE NMR; NUCLEAR MAGNETIC-RESONANCE; MAGIC-ANGLE SPINNER; AIR-SENSITIVE SAMPLES; SPECTROSCOPY; ROTOR; POLARIZATION; SYSTEM C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP PRUSKI, M (reprint author), INST PHYS RES & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 22 TC 7 Z9 7 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-2364 J9 J MAGN RESON JI J. Magn. Reson. PD FEB 15 PY 1992 VL 96 IS 3 BP 574 EP 581 DI 10.1016/0022-2364(92)90342-5 PG 8 WC Biochemical Research Methods; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Biochemistry & Molecular Biology; Physics; Spectroscopy GA HF647 UT WOS:A1992HF64700012 ER PT J AU KAMEDA, J MAO, X AF KAMEDA, J MAO, X TI SMALL-PUNCH AND TEM-DISK TESTING TECHNIQUES AND THEIR APPLICATION TO CHARACTERIZATION OF RADIATION-DAMAGE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID INTERGRANULAR EMBRITTLEMENT; TRANSITION BEHAVIOR; NEUTRON-IRRADIATION; SOLUTE SEGREGATION; BRITTLE-FRACTURE; ALLOY-STEEL; SPECIMEN; TOUGHNESS AB The present paper summarizes the development of miniaturized small-punch (SP) and TEM-disc (TD) testing techniques and shows their applicability in characterizing the mechanical properties of irradiated materials. The yield strength, ductility and fracture toughness, J(lc), were empirically estimated by analysing the deformation and fracture behaviour observed in the miniaturized specimen tests. The ductile-brittle transition temperature (DBTT) was determined from the variation of the SP or TD fracture energy with temperature. A linear correlation between the DBTT obtained from the SP and Charpy V-notched specimen tests has been theoretically and experimentally established. The problems of cracking detection and data scattering often observed in the SP or TD specimen tests are discussed in terms of heterogeneous embrittlement behaviour of materials. It has been demonstrated that these miniaturized testing techniques are capable of evaluating hardening, DBTT shifts and J(lc) decreases caused by neutron irradiation. C1 UNIV CALGARY,DEPT MECH ENGN,CALGARY T2N 1N4,ALBERTA,CANADA. RP KAMEDA, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 20 TC 67 Z9 72 U1 1 U2 7 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD FEB 15 PY 1992 VL 27 IS 4 BP 983 EP 989 DI 10.1007/BF01197651 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA HG279 UT WOS:A1992HG27900020 ER PT J AU DUONG, H BEEMAN, M WOLFENSTINE, J AF DUONG, H BEEMAN, M WOLFENSTINE, J TI CREEP OF KCL-KBR SOLID-SOLUTION ALLOYS SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID CLASS-I; BEHAVIOR; SUBSTRUCTURE C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DUONG, H (reprint author), UNIV CALIF IRVINE,DEPT MECH & AEROSP ENGN,MAT SECT,IRVINE,CA 92717, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD FEB 15 PY 1992 VL 11 IS 4 BP 238 EP 240 DI 10.1007/BF00741432 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA HG281 UT WOS:A1992HG28100018 ER PT J AU CHEN, MJ RATHKE, JW AF CHEN, MJ RATHKE, JW TI UNUSUAL TAUTOMERISM INVOLVING PROTON MIGRATION BETWEEN METAL AND PYRROLIC NITROGEN IN A HYDRIDORHODIUM PHTHALOCYANINE COMPLEX SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article AB Hydrido(1,4,8,11,15,18,22,25-octapentylphthalocyanato)rhodium, an unprecedented hydrido metallophthalocyanine, exhibits an unusual tautomerism involving proton migration from rhodium to pyrrolic nitrogen. RP CHEN, MJ (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD FEB 15 PY 1992 IS 4 BP 308 EP 309 DI 10.1039/c39920000308 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HH971 UT WOS:A1992HH97100012 ER PT J AU WANG, ZL BENTLEY, J AF WANG, ZL BENTLEY, J TI REFLECTION ELECTRON ENERGY-LOSS SPECTROSCOPY AND IMAGING FOR SURFACE STUDIES IN TRANSMISSION ELECTRON-MICROSCOPES SO MICROSCOPY RESEARCH AND TECHNIQUE LA English DT Article DE REFLECTION ELECTRON MICROSCOPY; SECONDARY ELECTRON IMAGING; FIELD EMISSION GUN; INSITU REM ID CRYSTAL-SURFACES; LOSS SPECTRA; FCC METALS; BEAM; EXCITATIONS; STEPS; RESONANCE; RHEED; REELS; MICROANALYSIS AB A review is given on the techniques and applications of high-energy reflection electron energy-loss spectroscopy (REELS) and reflection electron microscopy (REM) for surface studies in scanning transmission electron microscopes (STEM) and conventional transmission electron microscopes (TEM). A diffraction method is introduced to identify a surface orientation in the geometry of REM. The surface dielectric response theory is presented and applied for studying alpha-alumina surfaces. Domains of the alpha-alumina (012) surface initially terminated with oxygen can be reduced by an intense electron beam to produce Al metal; the resistance to beam damage of surface domains initially terminated with Al+3 ions is attributed to the screening effect of adsorbed oxygen. Surface energy-loss near-edge structure (ELNES), extended energy-loss fine structure (EXELFS), and microanalysis using REELS are illustrated based on the studies of TiO2 and MgO. Effects of surface resonances (or channeling) on the REELS signal-to-background ratio are described. The REELS detection of a monolayer of oxygen adsorption on diamond (111) surfaces is reported. It is shown that phase contrast REM image content can be significantly increased with the use of a field emission gun (FEG). Phase contrast effects close to the core of a screw dislocation are discussed and the associated Fresnel fringes around a surface step are observed. Finally, an in situ REM experiment is described for studying atomic desorption and diffusion processes on alpha-alumina surfaces at temperatures of 1,300-1,400-degrees-C. C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,BLDG 5500,MS 6376,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 49 TC 8 Z9 8 U1 1 U2 7 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 1992 VL 20 IS 4 BP 390 EP 405 DI 10.1002/jemt.1070200409 PG 16 WC Anatomy & Morphology; Biology; Microscopy SC Anatomy & Morphology; Life Sciences & Biomedicine - Other Topics; Microscopy GA HF785 UT WOS:A1992HF78500008 PM 1498353 ER PT J AU BLIND, B CHRISTIAN, R CLOUT, P DOMBECK, T FLICKER, D FUKA, M GILPATRICK, D HARDEKOPF, R HEIGHWAY, E JASON, A MCKEE, R MOTTERSHEAD, CT SAWYER, G SHAFER, R SIMMONS, JE STRATTON, T WALTON, RB ZANDER, M BELLINGER, F BRUMWELL, F FINK, C HUMMER, C MEADES, P NOVICK, A ROCHE, C ROSING, M YULE, T BOS, R MCGEHEE, S AF BLIND, B CHRISTIAN, R CLOUT, P DOMBECK, T FLICKER, D FUKA, M GILPATRICK, D HARDEKOPF, R HEIGHWAY, E JASON, A MCKEE, R MOTTERSHEAD, CT SAWYER, G SHAFER, R SIMMONS, JE STRATTON, T WALTON, RB ZANDER, M BELLINGER, F BRUMWELL, F FINK, C HUMMER, C MEADES, P NOVICK, A ROCHE, C ROSING, M YULE, T BOS, R MCGEHEE, S TI PERFORMANCE OF AN EXPANDING TELESCOPE USED TO OBTAIN A LOW DIVERGENCE H- BEAM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB An expanding telescope constructed by Loss Alamos National Laboratory was installed at Argonne National Laboratory to produce a low divergence, 50 MeV H- beam. The telescope with a twenty times magnification consisted of a singlet eyepiece and triplet objective lens constructed from permanent quadrupole magnets. The output beam divergence was measured with a rms resolution near 1-mu-rad using a pinhole membrane and an optical imaging system. This system also provided a measure of the third order geometric aberrations of the telescope by the displacement of the centroids in the projected image of a rectilinear array of pinholes placed across the beam diameter. The geometric aberrations were found to be in agreement with computer calculations, having magnitudes on the order of a few mu-rad/cm3. Chromatic aberrations in the telescope were also found to be in agreement with theory. These measurements showed that the telescope achieved a nearly parallel beam with a divergence of less than 25-mu-rad. C1 EG&G CORP,LOS ALAMOS OPERAT,LOS ALAMOS,NM 87545. ARGONNE NATL LAB,ARGONNE,IL 60439. RP BLIND, B (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 26 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 15 PY 1992 VL 312 IS 3 BP 397 EP 414 DI 10.1016/0168-9002(92)90188-A PG 18 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HE025 UT WOS:A1992HE02500001 ER PT J AU CONNOLLY, RC JOHNSON, KF SANDOVAL, DP YUAN, V AF CONNOLLY, RC JOHNSON, KF SANDOVAL, DP YUAN, V TI A TRANSVERSE PHASE-SPACE MEASUREMENT TECHNIQUE FOR HIGH-BRIGHTNESS, H- BEAMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A common method of measuring transverse phase-space distributions in charged-particle beams is to intercept the beam with slits, pinhole plates, or wire grids, and to measure the beam distribution after a drift with a parallel-channel collector or a fluorescent screen. Many of the next generation of accelerator applications (e.g., in heavy-ion fusion and transmutation of nuclear waste) will utilize high-beam currents with small phase-space distributions. The power densities of beams will be too large to permit the interception of entire beams. This paper describes a measurement technique that is applicable to H- beams: a small portion of the beam is separated from the full beam by means of photoneutralization with a laser that is upstream from a sweep magnet. Phase-space measurements are made on only the neutralized beam. RP CONNOLLY, RC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 5 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 15 PY 1992 VL 312 IS 3 BP 415 EP 419 DI 10.1016/0168-9002(92)90189-B PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HE025 UT WOS:A1992HE02500002 ER PT J AU GABUTTI, A GRAY, KE PUGH, GM TIBERIO, R AF GABUTTI, A GRAY, KE PUGH, GM TIBERIO, R TI A FAST, SELF-RECOVERING SUPERCONDUCTING STRIP PARTICLE DETECTOR MADE WITH GRANULAR TUNGSTEN SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID FILMS AB The ability of detectors to automatically recover (self-recovery) in a short period of time after sensing a particle is a very valuable advantage for their use as microvertex detectors at high energy particle colliders. Using a superconducting strip detector made of granular tungsten, we have observed such behavior with pulse amplitudes of few 100-mu-V and recovery times fo 10-50 ns. A 1.8-mu-m wide thin film was used to detect the superconducting-to-normal transisitions induced by the absorption of Fe-55, 6 keV X-rays. For high bias currents the detector did not self-recover and a constant efficiency estimated to approximately 65% was found, but with good indications that such a rate would persist in the self-recovery mode at lower bias currents. The threshold between self-recovering and propagating hotspots is discussed within the thermal propagation model, developed previously for normal regions which bridge the width of the strip. These results also confirm the potential applications of superconducting strips for high resolution X-rays detectors. C1 NATL NANOFABRICAT FACIL,ITHACA,NY 14853. RP GABUTTI, A (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 24 TC 14 Z9 14 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 15 PY 1992 VL 312 IS 3 BP 475 EP 482 DI 10.1016/0168-9002(92)90197-C PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HE025 UT WOS:A1992HE02500010 ER PT J AU YOST, GP AF YOST, GP TI AVERAGING IN THE PRESENCE OF SLIDING ERRORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB In many cases the precision with which an experiment can measure a physical quantity depends on the value of that quantity. Not having access to the true value, experimental groups are forced to assign their errors based on their own measured value. Procedures which attempt to derive an improved estimate of the true value by a suitable average of such measurements usually weight each experiment's measurement according to the reported variance. However, one is in a position to derive improved error estimates for each experiment from the average itself, provided an approximate idea of the functional dependence of the error on the central value is known. Failing to do so can lead to substantial biases. Techniques which avoid these biases without loss of precision are proposed and their performance is analyzed with examples. These techniques are quite general and can bring about an improvement even when the behavior of the errors is not well understood. Perhaps the most important application of the technique is in fitting curves to histograms. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP YOST, GP (reprint author), SSC LAB,DIV PHYS RES,2550 BECKLEYMEADE AVE,DALLAS,TX 75237, 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 15 PY 1992 VL 312 IS 3 BP 598 EP 608 DI 10.1016/0168-9002(92)90210-U PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HE025 UT WOS:A1992HE02500023 ER PT J AU KLEMM, RA LIU, SH AF KLEMM, RA LIU, SH TI CROSSOVER FROM REAL SPACE TO INTRABAND PAIRING IN THE COPPER-OXIDE SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID ELECTRONIC-STRUCTURE; YBA2CU3O7; GAP AB We have investigated BCS-like models of layered superconductors with N = 2 conducting layers per unit cell, both in the real space or discrete layer representation, and in the band representation with interband pairing projected out. The single quasiparticles are assumed to propagte as free particles within the conducting layers with effective masses m1 and m2, and tunnel between neighboring layers with matrix elements J1 and J2, respectively. Intralayer pairing with strengths lambda(01), lambda(02) and interlayer pairing with strengths lambda(1) lambda(2) are both considered. For all such processes, J1 and J2 are pairbreaking parameters for interband pairing. The transition temperatures for real space and intraband pairing are compared, and a crossover from real space to intraband pairing occurs as the interlayer hopping is increased. This crossover usually occurs when J(max)/omega(c) almost-equal-to 1, where J(max) is the maximum interlayer tunneling matrix element, and omega(c) is the BCS cutoff energy for the appropriate pairing process, but can sometimes occur for smaller J(max) values. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP KLEMM, RA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 20 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD FEB 15 PY 1992 VL 191 IS 3-4 BP 383 EP 398 DI 10.1016/0921-4534(92)90935-6 PG 16 WC Physics, Applied SC Physics GA HJ688 UT WOS:A1992HJ68800014 ER PT J AU BRADEN, M HEGER, G SCHWEISS, P FISK, Z GAMAYUNOV, K TANAKA, I KOJIMA, H AF BRADEN, M HEGER, G SCHWEISS, P FISK, Z GAMAYUNOV, K TANAKA, I KOJIMA, H TI CHARACTERIZATION AND STRUCTURAL-ANALYSIS OF TWINNED LA2-XSRXCUO4+/-DELTA CRYSTALS BY NEUTRON-DIFFRACTION SO PHYSICA C LA English DT Article ID TEMPERATURE SUPERCONDUCTOR LA1.85SR0.15CUO4; PHASE-TRANSITION; LA2CUO4; TC; TRANSPORT; DEFECTS AB The microstructure of La2-xSrxCuO4 +/- delta crystals has been studied by neutron diffraction. Profile analysis of the intensity of Bragg reflections shows that the large crystals consist of domains of four different orientations, which are related to the symmetry reduction of the phase transition I4/mmm-Abma. The domain structure has a strong influence on the extinction, therefore it may be studied macroscopically. The microstructure is formed at the phase transition and does not change in the orthorhombic phase. After a first cooling cycle the formation of the domains appears to be reversible without a temperature hysteresis. The same domain structure appears in consecutive cooling cycles. This indicates a pinning of the domain structure by lattice defects. A data set of Bragg reflection intensities obtained on a twinned La1.93Sr0.07CuO4 crystal at room temperature could be refined with special consideration of the microtwinning. The achieved precision of structural parameters is almost comparable to structural analyses on monodomain single crystals. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST NUKL FESTKORPERPHYS,W-7500 KARLSRUHE 1,GERMANY. YAMANASHI UNIV,INST INORGAN SYNTH,KOFU,YAMANASHI 400,JAPAN. MOSCOW GEN PHYS INST,MOSCOW 182,USSR. UNIV COLOGNE,INST PHYS 2,W-5000 COLOGNE 41,GERMANY. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP BRADEN, M (reprint author), CEA,CNRS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. RI Tanaka, Isao/D-1519-2012 NR 37 TC 28 Z9 28 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 15 PY 1992 VL 191 IS 3-4 BP 455 EP 468 DI 10.1016/0921-4534(92)90944-8 PG 14 WC Physics, Applied SC Physics GA HJ688 UT WOS:A1992HJ68800023 ER PT J AU BAK, P FLYVBJERG, H AF BAK, P FLYVBJERG, H TI SELF-ORGANIZATION OF CELLULAR MAGNETIC-DOMAIN PATTERNS SO PHYSICAL REVIEW A LA English DT Article ID GARNET-FILMS; CRITICALITY AB We model the self-organizing dynamics of two-dimensional magnetic-domain patterns. Using a random-neighbor approximation, avalanches of topological rearrangements and domain destruction are easily simulated numerically, and asymptotic forms for distributions of avalanche sizes and lifetimes can be given analytically. Recent experimental results for such distributions are found to obey these asymptotic forms, which permits us to classify the self-organized state observed in experiments as subcritical. C1 NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. RP BAK, P (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Flyvbjerg, Henrik/C-1127-2009 OI Flyvbjerg, Henrik/0000-0002-1691-9367 NR 13 TC 31 Z9 31 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB 15 PY 1992 VL 45 IS 4 BP 2192 EP 2200 DI 10.1103/PhysRevA.45.2192 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HE481 UT WOS:A1992HE48100013 ER PT J AU ERPENBECK, JJ AF ERPENBECK, JJ TI TRANSPORT-COEFFICIENTS OF HARD-SPHERE MIXTURES .2. DIAMETER RATIO 0.4 AND MASS RATIO 0.03 AT LOW-DENSITY SO PHYSICAL REVIEW A LA English DT Article ID MOLECULAR-DYNAMICS CALCULATIONS; VELOCITY-CORRELATION FUNCTIONS; ASYMPTOTIC TIME BEHAVIOR; MODIFIED ENSKOG EQUATION; GREEN-KUBO INTEGRANDS; MULTICOMPONENT MIXTURES; MUTUAL DIFFUSION; SHEAR VISCOSITY; BINARY-MIXTURES; 3 DIMENSIONS AB The transport coefficients of shear viscosity, thermal conductivity, thermal diffusion, and mutual diffusion are estimated for a binary, equimolar mixture of hard spheres having a diameter ratio of 0.4 and a mass ratio of 0.03 at volumes of 5V0, 10V0, and 20V0 (where V0 = 1/2 unroofed radical 2NBAR SIGMA(a) x(a)sigma(a)3, x(a) are mole fractions, sigma(a) are diameters, and N is the number of particles) through Monte Carlo, molecular-dynamics calculations using the Green-Kubo formulas. Calculations are reported for as few as 108 and as many as 4000 particles, but not for each value of the volume. Both finite-system and long-time-tail corrections are applied to obtain estimates of the transport coefficients in the thermodynamic limit; corrections of both types are found to be small. The results are compared with the predictions of the revised Enskog theory and the linear density corrections to that theory are reported. The mean free time is also computed as a function of density and the linear and quadratic corrections to the Boltzmann theory are estimated. The mean free time is also compared with the expression from the Mansoori-Carnahan-Starling-Leland equation of state. RP ERPENBECK, JJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 34 TC 15 Z9 15 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB 15 PY 1992 VL 45 IS 4 BP 2298 EP 2307 DI 10.1103/PhysRevA.45.2298 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HE481 UT WOS:A1992HE48100026 ER PT J AU DRAGT, AJ NERI, F RANGARAJAN, G AF DRAGT, AJ NERI, F RANGARAJAN, G TI GENERAL MOMENT INVARIANTS FOR LINEAR HAMILTONIAN-SYSTEMS SO PHYSICAL REVIEW A LA English DT Article AB This paper studies the behavior of the moments of a particle distribution as it is transported through a Hamiltonian system. Functions of moments that remain invariant for an arbitrary linear Hamiltonian system are constructed. These functions remain approximately invariant for Hamiltonian systems that are not strongly nonlinear. Consequently, they can be used to characterize the degree of nonlinearity of the system. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP DRAGT, AJ (reprint author), UNIV MARYLAND,CTR THEORET PHYS,COLLEGE PK,MD 20742, USA. NR 28 TC 48 Z9 48 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB 15 PY 1992 VL 45 IS 4 BP 2572 EP 2585 DI 10.1103/PhysRevA.45.2572 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HE481 UT WOS:A1992HE48100056 ER PT J AU ERIKSSON, O WILLS, JM AF ERIKSSON, O WILLS, JM TI THEORETICAL ASPECTS OF THE 5F DELOCALIZATION OF AMERICIUM UNDER PRESSURE SO PHYSICAL REVIEW B LA English DT Article ID ACTINIDE ELEMENTS; CRYSTAL-STRUCTURE; BULK PROPERTIES; BRILLOUIN-ZONE; SPECIAL POINTS; BAND; SYSTEMS; METALS AB Americium is the first element of the actinide series with localized and chemically inert 5f electrons. It has earlier been demonstrated that with applied pressure the 5f electrons in Am become itinerant, and therefore bonding. The crystal structure of americium has been experimentally determined to change with increasing pressure; it changes from double hcp --> fcc --> monoclinic or distorted fcc --> the alpha-uranium structure (orthorhombic), or a related structure. The experimentally observed volume collapse associated with 5f delocalization is very small. In contrast, previous theoretical calculations have predicted a volume collapse between 25% and 40%. We present the total energy versus volume of americium in the fcc and in the experimentally reported alpha-uranium structure obtained from fully relativistic, full-potential, linear-muffin-tin-orbital calculations based on the local-density approximation. In combination with previous calculations for the low-pressure phase, our calculations predict that the delocalization of the 5f electrons in americium is accompanied by a approximately 34% volume collapse. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP ERIKSSON, O (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 31 TC 21 Z9 21 U1 0 U2 2 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 1992 VL 45 IS 7 BP 3198 EP 3203 DI 10.1103/PhysRevB.45.3198 PG 6 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400002 ER PT J AU GUO, J ELLIS, DE LAM, DJ AF GUO, J ELLIS, DE LAM, DJ TI 1ST-PRINCIPLES CALCULATION OF THE ELECTRONIC-STRUCTURE OF SAPPHIRE - BULK STATES SO PHYSICAL REVIEW B LA English DT Article ID RAY-ABSORPTION SPECTRA; EMBEDDED-CLUSTER MODEL; DENSITY-FUNCTIONAL THEORY; MAGNETIC-IMPURITIES; EMISSION SPECTROSCOPY; CORRELATION-ENERGY; BAND-STRUCTURE; APPROXIMATION; COPPER; OXIDE AB The electronic structure of sapphire, alpha-Al2O3, was calculated using the self-consistent-field discrete variational method in the local-density framework. Clusters of the size of 26-80 atoms embedded in the infinite host lattice were used to model the sapphire single crystal. A three-dimensional Ewald summation was used to obtain the Coulomb potential of the infinite lattice. Calculations were performed on ten clusters centered at four points of different point-group symmetries in bulk sapphire. The consistency of the calculated electronic structure among these ten clusters and good agreement with experimental data and recent first-principles band-structure calculations indicate that the bulk values can be achieved with clusters of modest size. Features in the valence density of states are interpreted with the help of the bond densities between the O atom and its near neighbors. Bulk sapphire is found to be mostly ionic measured by about 2% orbital overlaps between nearest-neighbor Al and O atoms, with no charge accumulation in the bonding region. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 57 TC 59 Z9 60 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3204 EP 3214 DI 10.1103/PhysRevB.45.3204 PG 11 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400003 ER PT J AU HOLROYD, R NISHIKAWA, M NAKAGAWA, K KATO, N AF HOLROYD, R NISHIKAWA, M NAKAGAWA, K KATO, N TI PRESSURE-DEPENDENCE OF THE CONDUCTION-BAND ENERGY OF NONPOLAR LIQUIDS SO PHYSICAL REVIEW B LA English DT Article ID EXCESS ELECTRON-MOBILITY; HALL-MOBILITY; 2,2,4-TRIMETHYLPENTANE; TETRAMETHYLSILANE; TEMPERATURE; SOLVENTS; BENZENE; TOLUENE AB The energy V0 of the conduction state of the quasifree electron is reported as a function of pressure up to 2.5 kbar for n-pentane, 2,2-dimethylbutane, 2,2,4-trimethylpentane, 2,2,4,4-tetramethylpentane, and tetramethylsilane (TMS). For each liquid, V0 increases with increasing pressure. The largest change with pressure is observed for n-pentane, the smallest change for TMS. The results are used together with a density-fluctuation theory to calculate the effect of pressure on the mobility of quasifree electrons. The theory predicts the direction of change in mobility with pressure found experimentally (decreasing with pressure for TMS and increasing with pressure for branched hydrocarbons) as well as the relative magnitude of the changes. C1 UNIV TOKYO,DEPT PURE & APPL SCI,MEGURO KU,TOKYO 153,JAPAN. NAGOYA UNIV,DEPT SYNTHET CHEM,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. RP HOLROYD, R (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 25 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3215 EP 3220 DI 10.1103/PhysRevB.45.3215 PG 6 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400004 ER PT J AU KUTZLER, FW PAINTER, GS AF KUTZLER, FW PAINTER, GS TI 1ST-ROW DIATOMICS - CALCULATION OF THE GEOMETRY AND ENERGETICS USING SELF-CONSISTENT GRADIENT-FUNCTIONAL APPROXIMATIONS SO PHYSICAL REVIEW B LA English DT Article ID LOCAL-DENSITY APPROXIMATION; ELECTRON-GAS; CORRELATION-ENERGY; CHARGE-DENSITIES; GROUND-STATE; MOLECULES; EXCHANGE; FORMALISM; SOLIDS; ATOMS AB A fully self-consistent series of nonlocal (gradient) density-functional calculations has been carried out using the augmented-Gaussian-orbital method to determine the magnitude of gradient corrections to the potential-energy curves of the first-row diatomics, Li2 through F2. Both the Langreth-Mehl-Hu and the Perdew-Wang gradient-density functionals were used in calculations of the binding energy, bond length, and vibrational frequency for each dimer. Comparison with results obtained in the local-spin-density approximation (LSDA) using the vosko-Wilk-Nusair functional, and with experiment, reveals that bond lengths and vibrational frequencies are rather insensitive to details of the gradient functionals, including self-consistency effects, but the gradient corrections reduce the overbinding commonly observed in the LSDA calculations of first-row diatomics (with the exception of Li2, the gradient-functional binding-energy error is only 50-12% of the LSDA error). The improved binding energies result from a large differential energy lowering, which occurs in open-shell atoms relative to the diatomics. The stabilization of the atom arises from the use of nonspherical charge and spin densities in the gradient-functional calculations. This stabilization is negligibly small in LSDA calculations performed with nonspherical densities. C1 TENNESSEE TECHNOL UNIV, DEPT CHEM, COOKEVILLE, TN 38505 USA. RP OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. NR 44 TC 30 Z9 30 U1 1 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 1992 VL 45 IS 7 BP 3236 EP 3244 DI 10.1103/PhysRevB.45.3236 PG 9 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400007 ER PT J AU KWON, I BISWAS, R SOUKOULIS, CM AF KWON, I BISWAS, R SOUKOULIS, CM TI MOLECULAR-DYNAMICS SIMULATIONS OF DEFECT FORMATION IN HYDROGENATED AMORPHOUS-SILICON SO PHYSICAL REVIEW B LA English DT Article ID A-SI-H; STRUCTURAL ENERGIES; METASTABLE DEFECTS; GENERATION; MODELS; DEPENDENCE; SURFACES; DENSITY AB We have performed molecular-dynamics simulations to understand the Staebler-Wronski effect and defect formation in a-Si:H. The calculations are based on a-Si:H networks containing (1) only monohydride species and (2) both monohydride and dihydride species. A two- and three-body potential for Si-H interactions has been developed and used in conjunction with previous interatomic-potential models for Si-Si interactions. A localized excitation is used to model the nonradiative energy transfer of a photoexcited electron-hole pair to the lattice. Defect formation and annealing are discussed, together with their dependences on the positions of localized excitations, hydrogenation of Si, and the amount of excitation energy. The a-Si:H model with monohydride species only is stable to bond-breaking excitations. The a-Si:H model with both monohydride and dihydride species is less stable and does exhibit higher-energy dangling-bond states that can, however, be easily annealed away. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KWON, I (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,MICROELECTR RES CTR,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008 NR 39 TC 28 Z9 29 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 1992 VL 45 IS 7 BP 3332 EP 3339 DI 10.1103/PhysRevB.45.3332 PG 8 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400020 ER PT J AU SKINNER, AJ LAFEMINA, JP AF SKINNER, AJ LAFEMINA, JP TI SURFACE ATOMIC AND ELECTRONIC-STRUCTURE OF ZNO POLYMORPHS SO PHYSICAL REVIEW B LA English DT Article ID V-COMPOUND SEMICONDUCTORS; CLEAVAGE FACES; DIFFRACTION INTENSITIES; 110 SURFACES; GEOMETRIES; GAAS(110); METHANOL AB The surface atomic and electronic structures of the zinc-blende-, wurtzite-, and rocksalt-structure polymorphs of ZnO are investigated within a unified tight-binding (TB) model. For the fourfold-coordinated wurtzite and zinc-blende structures, large relaxations (approximately 0.54 angstrom) of the surface atoms are observed as a consequence of their ability to undergo approximately bond-length-conserving motions. For the sixfold-coordinated rocksalt structure, these motions are prohibited by the close-packed surface topology. Thus, only small movements of the cation and anion are expected in the direction normal to the surface. Within the resolution of this TB model (approximately 0.01 angstrom), we observe no surface relaxation of the rocksalt structure. RP SKINNER, AJ (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 35 TC 21 Z9 22 U1 0 U2 3 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 1992 VL 45 IS 7 BP 3557 EP 3564 DI 10.1103/PhysRevB.45.3557 PG 8 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400051 ER PT J AU FROYEN, S AF FROYEN, S TI REAL-SPACE GRIDS AND FAST FOURIER-TRANSFORMS IN PSEUDOPOTENTIAL SOLID-STATE CALCULATIONS SO PHYSICAL REVIEW B LA English DT Note ID FORMALISM AB The traditional criteria for selecting real-space grids in pseudopotential calculations lead to nonoptimal grids. We present two modifications that significantly reduce the number of real-space grid points needed to obtain a given accuracy. The first modification, a simple translation of reciprocal-space grid points, can be implemented with minimal additional computational effort. The second modification consists of a generalized grid that nevertheless can be Fourier transformed in order N log2 N operations. RP FROYEN, S (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3796 EP 3798 DI 10.1103/PhysRevB.45.3796 PG 3 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400082 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI EFFICIENT BRILLOUIN-ZONE AVERAGING IN SURFACE FORCE CALCULATIONS SO PHYSICAL REVIEW B LA English DT Note AB Pulay corrections to the force components parallel to the plane of a crystal surface can be calculated simply, knowing only the wave functions corresponding to wave vectors in the irreducible portion of the surface Brillouin zone. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3842 EP 3844 DI 10.1103/PhysRevB.45.3842 PG 3 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400094 ER PT J AU MANNINEN, S HAMALAINEN, K AF MANNINEN, S HAMALAINEN, K TI HIGH-RESOLUTION INELASTIC X-RAY-SCATTERING STUDY OF THE BORON K ABSORPTION-EDGE SO PHYSICAL REVIEW B LA English DT Note ID RAMAN-SCATTERING; BAND-STRUCTURE; FINE-STRUCTURE AB Inelastic scattering of 6.5-keV x rays has been used to study the near-edge structure of the beta-rhombohedral boron K absorption edge. High resolution (better than 1 eV) combined with bright, intense synchrotron radiation makes it possible to probe the fine structure of the density of unoccupied electron states and compare results with the few existing band-structure calculations for solid boron. C1 BROOKHAVEN NATL LAB, NSLS, UPTON, NY 11973 USA. RP MANNINEN, S (reprint author), UNIV HELSINKI, DEPT PHYS, SILTAVUORENPENGER 20D, SF-00170 HELSINKI 17, FINLAND. RI Hamalainen, Keijo/A-3986-2010 OI Hamalainen, Keijo/0000-0002-9234-9810 NR 14 TC 8 Z9 8 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3878 EP 3881 DI 10.1103/PhysRevB.45.3878 PG 4 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400104 ER PT J AU MYERS, SM FOLLSTAEDT, DM STEIN, HJ WAMPLER, WR AF MYERS, SM FOLLSTAEDT, DM STEIN, HJ WAMPLER, WR TI DEUTERIUM BONDING AT INTERNAL SURFACES IN SILICON SO PHYSICAL REVIEW B LA English DT Note ID HYDROGEN DESORPTION; KINETICS; SPECTROSCOPY; MONOHYDRIDE; ADSORPTION; SI(100) AB The strength of deuterium bonding to the walls of closed cavities within Si was determined in ion-beam experiments. These studies circumvented an inherent indeterminacy in the analysis of external-surface desorption and thereby achieved a quantitative characterization of Si-H surface bonding. The Si-D bond energy for submonolayer coverages is 2.5 +/- 0.2 eV. This value has implications for the reaction path of molecular desorption. RP MYERS, SM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 35 Z9 35 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3914 EP 3917 DI 10.1103/PhysRevB.45.3914 PG 4 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400113 ER PT J AU ZHU, XJ LOUIE, SG AF ZHU, XJ LOUIE, SG TI ANHARMONICITY OF THE HYDROGEN-CARBON STRETCH MODE ON DIAMOND (111)-1X1 SO PHYSICAL REVIEW B LA English DT Note ID SURFACES; RECONSTRUCTION; SI AB The structural and vibrational properties of the hydrogen-capped diamond (111)-1 x 1 surface are calculated using a first-principles total-energy approach. The stretching vibration of the hydrogen-carbon bond on the surface and, in particular, its anharmonicity are investigated. The calculated stretch-mode frequency is in agreement with experimental results from sum-frequency generation measurements to within 2.5%. The frequency shift arising from the anharmonicity, i.e., the difference between the overtone frequency and twice the fundamental frequency, is predicted to be 0.014 eV or 113 cm-1. This rather large anharmonicity should make it possible to measure directly the overtone frequency by near-infrared absorption. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 23 TC 26 Z9 26 U1 1 U2 3 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 1992 VL 45 IS 7 BP 3940 EP 3943 DI 10.1103/PhysRevB.45.3940 PG 4 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400120 ER PT J AU KHACHATURYAN, K WEBER, ER WHITE, RM AF KHACHATURYAN, K WEBER, ER WHITE, RM TI SURFACE-ACOUSTIC-WAVE STUDY OF DEFECTS IN GAAS GROWN BY MOLECULAR-BEAM EPITAXY AT 220-DEGREES-C SO PHYSICAL REVIEW B LA English DT Article ID LOW-TEMPERATURES; IDENTIFICATION; ANTISITE AB Surface acoustic waves (SAW's) were used to study the influence of defects on the elastic properties of epitaxial films of semiconductors. The object of this study was As-rich GaAs grown by molecular-beam-epitaxy at 220-degrees-C. The SAW velocity on 0.3-wavelength-thick epilayers was 1.2% smaller than on the substrate alone. That velocity difference decreased after loss of some excess As a result of 350-degrees-C-435-degrees-C anneals. A persistent increase as much as 0.4% of the SAW velocity at low temperatures was observed after illumination; this increase could be quenched by annealing at 120-130 K. This behavior is caused by the metastable transition of EL2-like As(Ga) defects and constitutes the direct experimental proof of the illumination-induced large lattice relaxation of this defect. The SAW velocity increase was correlated with the persistent bleaching of EL2-related optical absorption. The spectral dependence of rate of illumination-induced SAW velocity increase was measured. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY SENSOR & ACTUATOR CTR,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. RP KHACHATURYAN, K (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94120, USA. NR 30 TC 2 Z9 2 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4258 EP 4265 DI 10.1103/PhysRevB.45.4258 PG 8 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800036 ER PT J AU NELSON, JS DODSON, BW TAYLOR, PA AF NELSON, JS DODSON, BW TAYLOR, PA TI ADHESIVE AVALANCHE IN COVALENTLY BONDED MATERIALS SO PHYSICAL REVIEW B LA English DT Article ID ATOMIC-FORCE MICROSCOPY; NORM-CONSERVING PSEUDOPOTENTIALS; MOLECULAR-DYNAMICS; TOTAL ENERGY; SILICON; SURFACES; MODEL; METALS AB When two strongly interacting materials approach each other, a critical separation can be reached, perhaps several angstroms greater than the bulk separation, when they snap together. This process is known as adhesive avalanche, and is characterized by a structural phase transition from a system possessing two surfaces, to a state in tensile strain with no identifiable surfaces. In this paper, we use the self-consistent pseudopotential method to study the adhesive avalanche between two flat Si(111) surfaces. A detailed description of the evolution of charge densities, total energies, and relaxed structures for five initial separations of the Si(111) surfaces are given. The calculations show that the avalanche event in Si is due to the initiation of covalent-bond formation at a separation of about 2 angstrom greater than the bulk interplanar spacing, and is driven by localized stresses in the first few surface planes. RP NELSON, JS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 38 TC 21 Z9 21 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4439 EP 4444 DI 10.1103/PhysRevB.45.4439 PG 6 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800057 ER PT J AU TRICKEY, SB MULLERPLATHE, F DIERCKSEN, GHF BOETTGER, JC AF TRICKEY, SB MULLERPLATHE, F DIERCKSEN, GHF BOETTGER, JC TI INTERPLANAR BINDING AND LATTICE-RELAXATION IN A GRAPHITE DILAYER SO PHYSICAL REVIEW B LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; ANNEALED PYROLYTIC-GRAPHITE; DIFFUSE INTERSTELLAR BANDS; ELECTRONIC SURFACE-STATES; UNIVERSAL FEATURES; OPTICAL PROPERTIES; ELASTIC-CONSTANTS; DENSITY; ENERGY; SPECTROSCOPY AB High-precision, large-basis-set calculations, in the local-density approximation (LDA) (using the all-electron, full-potential, linear combination of Gaussian orbitals, fitting-function technique), of the cohesive properties and electronic states (bare Kohn-Sham energies) of the isolated AB dilayer of graphite are reported. They show that the dilayer interplanar spacing (c axis) differs little from the value for AB AB AB ... crystalline graphite (0.7% expansion relative to one calculation, 2.5% contraction relative to another, 2% expansion relative to experiment). This result, which differs significantly from a preliminary report of strong c-axis contraction, is related to the weak interplanar binding. The intraplanar lattice spacing (a axis) is virtually identical with the crystalline value for both the graphite dilayer and monolayer. The interplanar binding energy (obtained directly via optimization of the monolayer ground state with the same techniques) is in excellent (perhaps fortuitous) agreement with the experimental value for the crystal, in contrast with crystalline calculations, which are too large (in magnitude) by 40-100% or more. The dilayer cohesive energy agrees well with the crystalline value from an all-electron calculation. Both exceed the experimental value in magnitude by over 1 eV/atom, a problem already known to arise from inadequacies in the LDA treatment of the multiplet structure of the isolated C atom. The dilayer uniaxial compressibility is much larger than calculated for the crystal, apparently another manifestation of weak interplanar binding. Dilayer Kohn-Sham eigenvalues are largely consistent with those calculated self-consistently for the crystal using the same LDA model. Both differ substantially from the non-self-consistent band structure commonly used to parametrize graphite optical properties of interest in astrophysics. Calculated values of the dilayer work function are larger by about 0.6-0.7 eV than the crystalline experimental results. The dilayer density of states at the Fermi level is predicted to be much smaller than for the crystal, while the occupied bandwidth is in reasonable agreement with crystalline experimental results. C1 UNIV FLORIDA,DEPT PHYS,QUANTUM THEORY PROJECT,GAINESVILLE,FL 32611. UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. SWISS FED INST TECHNOL,PHYS CHEM LAB,CH-8092 ZURICH,SWITZERLAND. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP TRICKEY, SB (reprint author), MAX PLANCK INST PHYS & ASTROPHYS,INST ASTROPHYS,W-8046 GARCHING,GERMANY. RI Muller-Plathe, Florian/A-1922-2010 NR 60 TC 120 Z9 121 U1 0 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4460 EP 4468 DI 10.1103/PhysRevB.45.4460 PG 9 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800060 ER PT J AU POWELL, GL AF POWELL, GL TI REACTION PROBABILITY FOR EXCHANGE OF HYDROGEN ISOTOPES ON PALLADIUM SO PHYSICAL REVIEW B LA English DT Note ID DEUTERIUM AB Surface conductances measured for the diffusion of hydrogen in palladium have been used to calculate the probability, as a function of temperature, pressure, and hydrogen isotope, that a H, D, or T atom will enter bulk Pd as a result of a collision of a H2, D2, or T2 molecule with the Pd surface. This low probability is attributed to hydrogen penetrating a surface hydride phase under the driving force of the chemical potential of the gas consistent with the process having the exchange coefficient of the bulk material. These results were in good agreement with published experimental observations near 300 K and 100 kPa hydrogen pressure for D-H and H-D exchange. These exchange-probability calculations predict an isotope effect that inverts at elevated temperatures and, with decreasing temperature and increasing pressure, a marked decrease in the exchange probability. RP POWELL, GL (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE Y-12 PLANT,OAK RIDGE,TN 37831, USA. NR 12 TC 3 Z9 3 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4505 EP 4508 DI 10.1103/PhysRevB.45.4505 PG 4 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800069 ER PT J AU MCMAHON, TJ AF MCMAHON, TJ TI DEFECT EQUILIBRATION AND STABILIZATION IN LOW-SPIN-DENSITY A-SI-H SO PHYSICAL REVIEW B LA English DT Note ID HYDROGENATED AMORPHOUS-SILICON; RELAXATION AB Relaxation data provide evidence that thermally generated defects with spin observed in thick, undoped hydrogenated amorphous silicon (a-Si:H) films can be stabilized with alternate structural configurations. Some quenched-in metastable spins equilibrating further at a lower temperature relax and become more resistant to annealing. Although such an observation should be expected for a disordered material, it is inconsistent with predictions of two-level energy-configuration coordinate diagrams. Models employing either alternate lattice configurations for each metastable spin or different weak-bond sites for the mobile hydrogen can be used to explain this result. RP MCMAHON, TJ (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4512 EP 4515 DI 10.1103/PhysRevB.45.4512 PG 4 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800071 ER PT J AU GRANNAN, SM LANGE, AE HALLER, EE BEEMAN, JW AF GRANNAN, SM LANGE, AE HALLER, EE BEEMAN, JW TI NONOHMIC HOPPING CONDUCTION IN DOPED GERMANIUM AT T LESS-THAN 1-K SO PHYSICAL REVIEW B LA English DT Note ID STRONG ELECTRIC-FIELDS; ENERGY-BAND TAILS; TRANSPORT; GAAS AB Measurements of the non-Ohmic behavior of the hopping conductivity of doped germanium between 300 and 700 mK show that the conductivity obeys an electric-field dependence sigma(E, T) = sigma(0, T) x exp(eEL/kT) at field strengths as low as 0.04 V/cm. This result is in disagreement with theoretical models which predict that the conductivity should obey the relation 1n-sigma-approximately E only for field strengths greater than approximately 1 V/cm, below which the conductivity is in an. ''Ohmic regime.'' L, the length paremeter describing the field dependence, is found to increase with decreasing temperature as L approximately T-1 in the variable-range-hopping regime. C1 UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RP GRANNAN, SM (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 24 TC 25 Z9 25 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4516 EP 4519 DI 10.1103/PhysRevB.45.4516 PG 4 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800072 ER PT J AU HEINEY, PA VAUGHAN, GBM FISCHER, JE COUSTEL, N COX, DE COPLEY, JRD NEUMANN, DA KAMITAKAHARA, WA CREEGAN, KM COX, DM MCCAULEY, JP SMITH, AB AF HEINEY, PA VAUGHAN, GBM FISCHER, JE COUSTEL, N COX, DE COPLEY, JRD NEUMANN, DA KAMITAKAHARA, WA CREEGAN, KM COX, DM MCCAULEY, JP SMITH, AB TI DISCONTINUOUS VOLUME CHANGE AT THE ORIENTATIONAL-ORDERING TRANSITION IN SOLID C-60 SO PHYSICAL REVIEW B LA English DT Note ID C-60 AB X-ray and neutron-diffraction measurements have been used to study the evolution of the lattice parameter of solid C60 through the orientational-ordering transition. The lattice parameter jumps by +0.044 +/- 0.004 angstrom on heating, indicating a strongly first-order transition. The average isobaric volume thermal-expansion coefficient both above and below the transition is 6.2 +/- 0.2 x 10(-5) K-1. We observe phase coexistence over a 5-K range, but little if any hysteresis. C1 UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104. UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104. RP HEINEY, PA (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Vaughan, Gavin/B-1479-2010 NR 23 TC 163 Z9 163 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4544 EP 4547 DI 10.1103/PhysRevB.45.4544 PG 4 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800079 ER PT J AU TURNER, MS AF TURNER, MS TI DIRAC NEUTRINOS AND SN-1987A SO PHYSICAL REVIEW D LA English DT Article ID HELICITY-FLIPPED NEUTRINOS; E6 PARTICLE MASSES; BETA-SPECTRUM; HEAVY NEUTRINOS; ELECTROWEAK INTERACTIONS; SUPERNOVA 1987A; 17-KEV NEUTRINO; PAIR PRODUCTION; SN1987A SIGNAL; SEARCH AB Within the standard electroweak theory "wrong-helicity" neutrinos are produced in a nascent neutron star by "spin-flip" processes (at a rate proportional to m(nu)2), freely escape, and can lead to an excessively rapid cooling of the newly born neutron star. Previous work, based upon the neutrino-nucleon spin-flip scattering process alone, has shown that the observed cooling of the neutron star associated with SN 1987A excludes a Dirac-neutrino mass greater than approximately 20 keV for either nu(e), nu(mu), or nu(tau). We reexamine the emission of "wrong-helicity" Dirac neutrinos from SN 1987A and conclude that due to neutrino degeneracy and additional emission processes (N + N --> N + N + nu-nuBAR, pi- + p --> n + nu-nuBAR) the effect of a Dirac neutrino on the cooling of SN 1987A has been underestimated. While a precise Dirac-mass limit awaits the incorporation of our new rates into detailed numerical cooling models, we believe that the limit that follows from the cooling of SN 1987A is better, probably much better, than 10 keV. In particular, we believe that SN 1987A definitely excludes a 17-keV (purely) Dirac-mass neutrino that mixes with the electron neutrino at the 1% level. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP TURNER, MS (reprint author), FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 46 TC 35 Z9 35 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1992 VL 45 IS 4 BP 1066 EP 1075 DI 10.1103/PhysRevD.45.1066 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HE352 UT WOS:A1992HE35200010 ER PT J AU DODELSON, S JUBAS, JM AF DODELSON, S JUBAS, JM TI REIONIZATION AND DECAYING DARK MATTER SO PHYSICAL REVIEW D LA English DT Article ID MICROWAVE BACKGROUND-RADIATION; H-I REGIONS; MAGNETIC-MOMENT; NEUTRAL HYDROGEN; GALACTIC HALO; UPPER LIMIT; SMALL MASS; NEUTRINOS; CONSTRAINTS; UNIVERSE AB Gunn-Peterson tests suggest that the Universe was reionized after the standard recombination epoch. We present a systematic treatment of the ionization process by deriving the Boltzmann equations appropriate to this regime. A compact solution for the photon spectrum is found in terms of the ionization ratio. These equations are then solved numerically for the decaying-dark-matter scenario, wherein neutrinos with a mass of the order of 30 eV radiatively decay producing photons which ionize the intergalactic medium. We find that the neutrino mass and lifetime are severely constrained by Gunn-Peterson tests, observations of the diffuse photon spectrum in the ultraviolet regime, and the Hubble parameter. C1 MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. RP DODELSON, S (reprint author), FERMI NATL ACCELERATOR LAB, NASA, FERMILAB ASTROPHYS CTR, BOX 500, BATAVIA, IL 60510 USA. NR 70 TC 10 Z9 10 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 EI 1550-2368 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1992 VL 45 IS 4 BP 1076 EP 1090 DI 10.1103/PhysRevD.45.1076 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HE352 UT WOS:A1992HE35200011 ER PT J AU SALOPEK, DS AF SALOPEK, DS TI COLD-DARK-MATTER COSMOLOGY WITH NON-GUASSIAN FLUCTUATIONS FROM INFLATION SO PHYSICAL REVIEW D LA English DT Article ID DENSITY PERTURBATIONS; UNIVERSE; STRINGS; STATISTICS; EVOLUTION; FIELDS AB Non-Gaussian primordial fluctuations for structure formation may be generated during the inflationary epoch from the nonlinear interaction of two scalar fields with gravity. Semianalytical stochastic inflation calculations are described for nonlinear long-wavelength evolution in 3 + 1 dimensions. Long-wavelength fields are governed by a single equation, the separated Hamilton-Jacobi equation. Typically, non-Gaussian fluctuations arise when the scalar fields pass over a sharp feature in their potential surface. The subsequent evolution of these primordial fluctuations are calculated as scales reenter the horizon during the radiation-dominated and matter-dominated eras of the cold-dark-matter scenario. Contour maps for the linear density perturbation as well as the gravitational potential are displayed at the present epoch. In qualitative agreement with observations, one can construct models with enhanced sheetlike structures on the scale of approximately 25h-1 Mpc. The cleanest test of non-Gaussian fluctuations will hopefully occur in the near future from large-angle microwave-background anisotropy experiments. C1 NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP SALOPEK, DS (reprint author), UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,SILVER ST,CAMBRIDGE CB3 9EW,ENGLAND. NR 65 TC 60 Z9 60 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 1992 VL 45 IS 4 BP 1139 EP 1157 DI 10.1103/PhysRevD.45.1139 PG 19 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HE352 UT WOS:A1992HE35200016 ER PT J AU LU, HJ AF LU, HJ TI DRESSED SKELETON EXPANSION IN (1+1)-DIMENSIONAL FIELD-THEORY MODELS SO PHYSICAL REVIEW D LA English DT Article ID OPTIMIZED PERTURBATION-THEORY; SPONTANEOUS SYMMETRY BREAKING; SU(N) THIRRING MODEL; SINE-GORDON EQUATION; GROSS-NEVEU MODEL; EXACT S-MATRIX; QUANTUM CHROMODYNAMICS; 2 DIMENSIONS; RENORMALIZATION; QCD AB We discuss the implementation of the dressed skeleton expansion (DSE) and analyze various features of this perturbative calculational method in simple field-theory models in 1 + 1 dimensions. In particular, we investigate issues concerning loop skeleton diagrams, renormalization in the massive case, and the usage of the DSE for vertices involving matrix structures. RP STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 79 TC 20 Z9 20 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1992 VL 45 IS 4 BP 1217 EP 1232 DI 10.1103/PhysRevD.45.1217 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HE352 UT WOS:A1992HE35200025 ER PT J AU BENDER, CM COOPER, F MILTON, KA MOSHE, M PINSKY, SS SIMMONS, LM AF BENDER, CM COOPER, F MILTON, KA MOSHE, M PINSKY, SS SIMMONS, LM TI DELTA EXPANSION FOR LOCAL GAUGE-THEORIES .1 A ONE-DIMENSIONAL MODEL SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM-FIELD THEORY; PERTURBATIVE SCHEME; RENORMALIZATION AB The principles of the delta-perturbation theory were first proposed in the context of self-interacting scalar quantum field theory. There it was shown how to expand a (phi(2))1 + delta theory as a series in powers of delta and how to recover nonperturbative information about a phi(4) field theory from the delta expansion at delta = 1. The purpose of this series of papers is to extend the notions of delta-perturbation theory from boson theories to theories having a local gauge symmetry. In the case of quantum electrodynamics one introduces the parameter delta by generalizing the minimal coupling terms to psiBAR(not partial derivative-ie A)delta psiBAR and expanding in powers of delta. This interaction preserves local gauge invariance for all delta. While there are enormous benefits in using the delta-expansion (obtaining nonperturbative results), gauge theories present new technical difficulties not encountered in self-interacting boson theories because the expression (not partial derivative-ie A)delta contains a derivative operator. In the first paper of this series a one-dimensional model whose interaction term has the form psiBAR[d/dt-ig-phi(t)](delta)psi is considered. The virtue of this model is that it provides a laboratory in which to study fractional powers of derivative operators without the added complexity of gamma-matrices. In the next paper of this series we consider two-dimensional electrodynamics and show how to calculate the anomaly in the delta-expansion. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV OKLAHOMA,DEPT PHYS & ASTRON,NORMAN,OK 73019. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL. RP BENDER, CM (reprint author), WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130, USA. RI Milton, Kimball/B-5734-2011 OI Milton, Kimball/0000-0002-7148-0609 NR 22 TC 34 Z9 34 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1992 VL 45 IS 4 BP 1248 EP 1260 DI 10.1103/PhysRevD.45.1248 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HE352 UT WOS:A1992HE35200028 ER PT J AU KLEBIG, ML RUSSELL, LB RINCHIK, EM AF KLEBIG, ML RUSSELL, LB RINCHIK, EM TI MURINE FUMARYLACETOACETATE HYDROLASE (FAH) GENE IS DISRUPTED BY A NEONATALLY LETHAL ALBINO DELETION THAT DEFINES THE HEPATOCYTE-SPECIFIC DEVELOPMENTAL REGULATION-1 (HSDR-1) LOCUS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE DELETION MAPPING; COMPLEX SYNDROMES; HEREDITARY TYROSINEMIA ID TYROSINEMIA TYPE-I; HEREDITARY TYROSINEMIA; CHROMOSOMAL DELETIONS; MOUSE CHROMOSOME-7; EXPRESSION; LIVER; MICE; ENZYMES; REGION AB Homozygous deletion of the hepatocyte-specific developmental regulation 1 (hsdr-1) locus in mouse chromosome 7 results in perinatal death and a pleiotropic syndrome characterized by ultrastructural abnormalities of the liver and kidney, failure of induction of a number of specific transcription units in the liver and kidney during late gestation, and marked overexpression of an enzyme that defends against oxidative stress. Previously, the breakpoints of two albino (c) deletions (c14CoS and c1FAFyh) that genetically define hsdr-1 were localized, on a long-range map, in the vicinity of the distal breakpoint of a viable albino deletion (c24R75M) that breaks proximally within the c locus. Here we report the use of a probe derived from a deletion breakpoint fusion fragment cloned from c24R75M/c24R75M DNA to clone a breakpoint fusion fragment caused by the c14CoS deletion. The proximal breakpoint of the c14Cos deletion was discovered to disrupt a gene (Fah) encoding fumarylacetoacetate hydrolase, the last enzyme in the tyrosine degradation pathway. All of the extant c deletions eliciting the hsdr-1 phenotype prevent expression of the Fah gene in the liver, and all but one disrupt the coding segment of the gene. Therefore, the Fah gene maps within or proximal to the hsdr-1 locus, as defined by deletion breakpoints, and disruption of this gene may be partially or completely responsible for the phenotypes associated with the hsdr-1 deletion syndrome. These mouse mutants may also provide models for the human genetic disorder hereditary tyrosinemia, which is associated with fumarylacetoacetate hydrolase deficiency and liver and kidney dysfunction. C1 OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. NR 32 TC 63 Z9 64 U1 0 U2 0 PU NATL ACAD PRESS 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 1992 VL 89 IS 4 BP 1363 EP 1367 DI 10.1073/pnas.89.4.1363 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HE606 UT WOS:A1992HE60600045 PM 1741389 ER PT J AU GOODS, SH GUTHRIE, SE AF GOODS, SH GUTHRIE, SE TI MECHANICAL-PROPERTIES OF PALLADIUM AND PALLADIUM HYDRIDE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP GOODS, SH (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 10 TC 17 Z9 17 U1 1 U2 5 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 1992 VL 26 IS 4 BP 561 EP 565 DI 10.1016/0956-716X(92)90284-L PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HD272 UT WOS:A1992HD27200010 ER PT J AU HENAGER, CH BRIMHALL, JL HIRTH, JP AF HENAGER, CH BRIMHALL, JL HIRTH, JP TI SYNTHESIS OF A MOSI2/SIC COMPOSITE INSITU USING A SOLID-STATE DISPLACEMENT REACTION BETWEEN MO2C AND SI SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID MORPHOLOGICAL STABILITY; MECHANICAL-PROPERTIES; SYSTEM; ZIRCONIA; CERAMICS C1 WASHINGTON STATE UNIV, PULLMAN, WA 99164 USA. RP HENAGER, CH (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. OI Henager, Chuck/0000-0002-8600-6803 NR 21 TC 46 Z9 47 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD FEB 15 PY 1992 VL 26 IS 4 BP 585 EP 589 DI 10.1016/0956-716X(92)90288-P PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HD272 UT WOS:A1992HD27200014 ER PT J AU LUO, CP DAHMEN, U WITCOMB, MJ WESTMACOTT, KH AF LUO, CP DAHMEN, U WITCOMB, MJ WESTMACOTT, KH TI PRECIPITATION IN DILUTE CU-CR ALLOYS - THE EFFECTS OF PHOSPHORUS IMPURITIES AND AGING PROCEDURE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID BOUNDARIES C1 UNIV WITWATERSRAND,ELECTRON MICROSCOPE UNIT,JOHANNESBURG 2001,SOUTH AFRICA. RP LUO, CP (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720, USA. NR 10 TC 7 Z9 11 U1 3 U2 3 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 1992 VL 26 IS 4 BP 649 EP 654 DI 10.1016/0956-716X(92)90300-4 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HD272 UT WOS:A1992HD27200026 ER PT J AU MILLER, MK JAYARAM, R CAMUS, PP AF MILLER, MK JAYARAM, R CAMUS, PP TI GRAIN-BOUNDARY COMPOSITION IN NIAL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ATOM PROBE; NI3AL; CHEMISTRY; BORON RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 11 TC 18 Z9 18 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD FEB 15 PY 1992 VL 26 IS 4 BP 679 EP 684 DI 10.1016/0956-716X(92)90305-X PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HD272 UT WOS:A1992HD27200031 ER PT J AU TSAO, JY AF TSAO, JY TI GRAPHICAL REPRESENTATION OF AG-AU SURFACE SEGREGATION SO SURFACE SCIENCE LA English DT Article ID AUGER-ELECTRON SPECTROSCOPY; ALLOYS; ENERGY; MODEL AB I explore and extend a graphical representation in the monolayer approximation, of the thermodynamics of binary surfaces. The representation elucidates the physical origin of gamma, the surface work, and clarifies numerical calculations. I illustrate the representation by fitting the measured surface segregation isotherm in the well-studied binary system Ag-Au. RP TSAO, JY (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 24 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 15 PY 1992 VL 262 IS 3 BP 382 EP 386 DI 10.1016/0039-6028(92)90134-R PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HE395 UT WOS:A1992HE39500021 ER PT J AU SUTHERLAND, BM BENNETT, PV CONLON, K EPLING, GA SUTHERLAND, JC AF SUTHERLAND, BM BENNETT, PV CONLON, K EPLING, GA SUTHERLAND, JC TI QUANTITATION OF SUPERCOILED DNA CLEAVAGE IN NONRADIOACTIVE DNA - APPLICATION TO IONIZING-RADIATION AND SYNTHETIC ENDONUCLEASE CLEAVAGE SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID SINGLE-STRAND BREAKS; ETHIDIUM-BROMIDE; FLUORESCENCE; GELS C1 UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06268. RP SUTHERLAND, BM (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. FU NCI NIH HHS [CA 23096]; NHGRI NIH HHS [HG00371] NR 16 TC 23 Z9 23 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD FEB 14 PY 1992 VL 201 IS 1 BP 80 EP 86 DI 10.1016/0003-2697(92)90176-8 PG 7 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA HE336 UT WOS:A1992HE33600010 PM 1320349 ER PT J AU BHATIA, S WU, X SANDERS, DK GERSTEIN, BC PRUSKI, M KING, TS AF BHATIA, S WU, X SANDERS, DK GERSTEIN, BC PRUSKI, M KING, TS TI ETHENE HYDROGENATION OVER SILICA-SUPPORTED RU AND RU-CU BIMETALLIC CATALYSTS - THE ROLE OF DEFECTS AND SPECIAL SITES SO CATALYSIS TODAY LA English DT Article ID SINGLE-CRYSTAL SURFACES; ADSORBED HYDROGEN; RUTHENIUM; ETHYLENE; NMR; CHEMISORPTION; PLATINUM; COPPER; BEAM; C-13 AB H-1 NMR of chemisorbed hydrogen and solid state C-13 NMR were used to investigate ethene hydrogenation and decomposition on Ru/SiO2 and Ru-Cu/SiO2 catalysts. H-1 NMR results on Ru/SiO2 catalysts indicate that the weakly adsorbed hydrogen is more concentrated on defect-like Ru sites, and it is suggested to be thermodynamically more accessible than strongly adsorbed hydrogen for ethene hydrogenation under typical reaction conditions. Results from H-1 NMR also indicate that addition of Cu reduces the amount of the weakly bound hydrogen. Addition of Cu to Ru/SiO2 catalysts suppresses the activity of ethene hydrogenation as observed by C-13 NMR. This effect may be due to preferential population of defect-like edge and comer Ru sites by Cu, subsequently limiting the amount of the weakly bound hydrogen on the metal surfaces necessary for ethene hydrogenation. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. NR 18 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD FEB 14 PY 1992 VL 12 IS 2-3 BP 165 EP 175 DI 10.1016/0920-5861(92)85038-N PG 11 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JU288 UT WOS:A1992JU28800006 ER EF