FN Thomson Reuters Web of Science™ VR 1.0 PT J AU EASTERLING, WE CROSSON, PR ROSENBERG, NJ MCKENNEY, MS KATZ, LA LEMON, KM AF EASTERLING, WE CROSSON, PR ROSENBERG, NJ MCKENNEY, MS KATZ, LA LEMON, KM TI AGRICULTURAL IMPACTS OF AND RESPONSES TO CLIMATE-CHANGE IN THE MISSOURI-IOWA-NEBRASKA-KANSAS (MINK) REGION SO CLIMATIC CHANGE LA English DT Article ID EPIC MODEL; PRODUCTIVITY; EROSION; CORN; CO2 AB The climate of the 1930s was used as an analog of the climate that might occur in Missouri, Iowa, Nebraska and Kansas (the MINK region) as a consequence of global warming. The analog climate was imposed on the agriculture of the region under technological and economic conditions prevailing in 1984/87 and again under a scenario of conditions that might prevail in 2030. The EPIC model of Williams et al. (1984), modified to allow consideration of the yield enhancing effects of CO2 enrichment, was used to evaluate the impacts of the analog climate on the productivity and water use of some 50 representative farm enterprises. Before farm level adjustments and adaptations to the changed climate, and absent CO2 enrichment (from 350 to 450 ppm), production of corn, sorghum and soybeans was depressed by the analog climate in about the same percent under both current and 2030 conditions. Production of dryland wheat was unaffected. Irrigated wheat production actually increased. Farm level adjustments using low-cost currently available technologies, combined with CO2 enrichment, eliminated about 80% of the negative impact of the analog climate on 1984/87 baseline crop production. The same farm level adjustments, plus new technologies developed in response to the analog climate, when combined with CO2 enrichment, converted the negative impact on 2030 crop production to a small increase. The analog climate would have little direct effect on animal production in MINK. The effect, if any, would be by way of the impact on production of feed-grains and soybeans. Since this impact would be small after on-farm adjustments and CO2 enrichment, animal production in MINK would be little affected by the analog climate. C1 RESOURCES FUTURE INC, WASHINGTON, DC 20036 USA. PACIFIC NW LAB, WASHINGTON, DC 20024 USA. EA ENGN SCI & TECHNOL, LINCOLN, NE 68508 USA. CORNELL UNIV, DEPT ECOL & SYSTEMAT, ITHACA, NY 13853 USA. NATURE CONSERVANCY, ARLINGTON, VA 22209 USA. RP EASTERLING, WE (reprint author), UNIV NEBRASKA, INST AGR & NAT RESOURCES, DEPT AGR METEOROL, LINCOLN, NE 68583 USA. NR 46 TC 115 Z9 120 U1 0 U2 17 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD JUN PY 1993 VL 24 IS 1-2 BP 23 EP 61 DI 10.1007/BF01091476 PG 39 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LR185 UT WOS:A1993LR18500003 ER PT J AU CROSSON, PR ROSENBERG, NJ AF CROSSON, PR ROSENBERG, NJ TI AN OVERVIEW OF THE MINK STUDY SO CLIMATIC CHANGE LA English DT Article AB Highlights of the previous papers in this series are reviewed. Methodology developed for the MINK study has improved the ability of impacts analysis to deal with questions of (1) spatial and temporal variability in climate change; (2) CO2-enrichment effects; (3) the reactions of complex enterprises (farms and forests) to climate change and their ability to adjust and adapt; and (4) integrated effects on current and, more particularly, on future regional economies. The methodology also provides for systematic study of adjustment and adaptation opportunities and of the inter-industry linkages that determine what the overall impacts on the regional economy might be. The analysis shows that with a 1930s 'dust bowl' climate the region-wide economic impacts would be small, after adjustments in affected sectors. In this final paper we consider whether synergistic effects among sectoral impacts and more severe climate change scenarios might alter this conclusion. The MINK analysis, as is, leads to the conclusion that a strong research capacity will be required to ensure that technologies facilitating adaptation to climate change will be available when needed. The capacity to deal with climate change also requires an open economy allowing for free trade and movement of people and for institutions that protect unpriced environmental values. More severe climate scenarios and negative synergisms can only strengthen these conclusions. C1 PACIFIC NW LAB, WASHINGTON, DC 20024 USA. RP CROSSON, PR (reprint author), RESOURCES FUTURE INC, 1616 P ST NW, WASHINGTON, DC 20036 USA. NR 8 TC 8 Z9 8 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD JUN PY 1993 VL 24 IS 1-2 BP 159 EP 173 DI 10.1007/BF01091481 PG 15 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LR185 UT WOS:A1993LR18500008 ER PT J AU RINALDO, FJ FAUSEY, MR AF RINALDO, FJ FAUSEY, MR TI EVENT RECONSTRUCTION IN HIGH-ENERGY PHYSICS SO COMPUTER LA English DT Article RP RINALDO, FJ (reprint author), FERMILAB NATL ACCELERATOR LAB,FARMS SUPERCOMP GRP,MS 369,POB 500,BATAVIA,IL 60510, USA. NR 12 TC 3 Z9 3 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD JUN PY 1993 VL 26 IS 6 BP 68 EP 77 DI 10.1109/2.214442 PG 10 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA LF850 UT WOS:A1993LF85000007 ER PT J AU BEGUELIN, A DONGARRA, J GEIST, A SUNDERAM, V AF BEGUELIN, A DONGARRA, J GEIST, A SUNDERAM, V TI VISUALIZATION AND DEBUGGING IN A HETEROGENEOUS ENVIRONMENT SO COMPUTER LA English DT Article ID PARALLEL C1 OAK RIDGE NATL LAB,MATH SCI SECT,COMP SCI GRP,POB 2008,OAK RIDGE,TN 37831. CARNEGIE MELLON UNIV,SCH COMP SCI,PITTSBURGH,PA 15213. PITTSBURGH SUPERCOMP CTR,PITTSBURGH,PA. UNIV TENNESSEE,KNOXVILLE,TN 37996. EMORY UNIV,DEPT MATH & COMP SCI,ATLANTA,GA 30322. RI Dongarra, Jack/E-3987-2014 NR 12 TC 18 Z9 18 U1 0 U2 3 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD JUN PY 1993 VL 26 IS 6 BP 88 EP 95 DI 10.1109/2.214445 PG 8 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA LF850 UT WOS:A1993LF85000009 ER PT J AU BELL, GI TORNEY, DC AF BELL, GI TORNEY, DC TI REPETITIVE DNA-SEQUENCES - SOME CONSIDERATIONS FOR SIMPLE SEQUENCE REPEATS SO COMPUTERS & CHEMISTRY LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL WORKSHOP ON OPEN PROBLEMS OF COMPUTATIONAL MOLECULAR BIOLOGY CY JUL 19-AUG 02, 1992 CL TELLURIDE SUMMER RES CTR, TELLURIDE, CO HO TELLURIDE SUMMER RES CTR ID HOMOLOGOUS RECOMBINATION; SPONTANEOUS MUTATION; GENETIC-VARIATION; HUMAN-CELLS; POLYMORPHISM; CONVERSION; EVOLUTION; RATES; LOCI; MAP AB Three topics are treated in this paper: (1) can the polymorphism evident in the length of many simple sequence repeats (SSRs) or microsatellites be explained as a result of unequal mitotic crossing over? We conclude that although this mechanism may be a reasonable explanation for polymorphisms of minisatellite sequences, it is less attractive for SSRs, because they are considerably shorter and some of the rates of generation of new length alleles are extremely high. A more likely mechanism is some form of slipped strand mispairing, whether occuring during normal DNA replication or during replication accompanying recombination. (2) Some results are presented on the number of mono- and di-nucleotide repeats in the human genome. For each high scoring locus, an optimal alignment is made of the actual with an ideal SSR; from such alignments, the relative numbers of insertions/deletions (indels), transitions and transversions are obtained for each class of SSR. (3) An elementary derivation of the number of equivalence classes of SSRs of any word length, n, is given. C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP BELL, GI (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,MS K710,LOS ALAMOS,NM 87545, USA. NR 30 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0097-8485 J9 COMPUT CHEM JI Comput. Chem. PD JUN PY 1993 VL 17 IS 2 BP 185 EP 190 DI 10.1016/0097-8485(93)85009-2 PG 6 WC Chemistry, Multidisciplinary; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA LX571 UT WOS:A1993LX57100009 ER PT J AU MICHAELS, GS TAYLOR, R HAGSTROM, R PRICE, M OVERBEEK, R AF MICHAELS, GS TAYLOR, R HAGSTROM, R PRICE, M OVERBEEK, R TI SEARCHING FOR GENOMIC ORGANIZATIONAL MOTIFS - EXPLORATIONS OF THE ESCHERICHIA-COLI CHROMOSOME SO COMPUTERS & CHEMISTRY LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL WORKSHOP ON OPEN PROBLEMS OF COMPUTATIONAL MOLECULAR BIOLOGY CY JUL 19-AUG 02, 1992 CL TELLURIDE SUMMER RES CTR, TELLURIDE, CO HO TELLURIDE SUMMER RES CTR ID TRANSLATION INITIATION; TRANSFER-RNA; DNA; ALIGNMENT; BINDING; SITES AB Understanding the coordinated control of gene expression is a central goal for much of the work in molecular biology. In order to understand how the mechanics of these control systems operate at the genome level, the data for the genetic organization of the model organism in question needs to be accessible. In previous work, we developed an integrated database to support analysis of the Escherichia coli genome. That system provided a pidgin English query facility, rudimentary pattern matching capabilities, and the ability to rapidly extract answers to a wide variety of questions about the organization of the E. coli genome. We have used a parser/grammar approach to identify the chromosomal positions of all of the mapped tRNA genes to be found in the aligned sequence fragments. Also, we have used this integrated data set to explore the global organization of the E. coli chromosome. We have begun to develop regulation classifications based on the arrangements of control features in relation to specific genetic control components. For example, using the individual DNA sequences for 111 known transcriptional promoters as a the starting position for analysis, we have identified the relative positions of potential control sites for 47 different procaryotic transcription factors, sigma factor 70 binding sites, and potential ribosome binding sites that occur within the region -500 to +500 bases upstream or downstream of the anchor position (the first base of the sequence feature). We have defined local descriptions for regulation based on the cross-correlated control features revealed through these analyses. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. RP MICHAELS, GS (reprint author), NIH,DIV COMP RES & TECHNOL,BETHESDA,MD 20892, USA. RI Price, Morgan/A-1266-2009 NR 23 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0097-8485 J9 COMPUT CHEM JI Comput. Chem. PD JUN PY 1993 VL 17 IS 2 BP 209 EP 217 DI 10.1016/0097-8485(93)85012-2 PG 9 WC Chemistry, Multidisciplinary; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA LX571 UT WOS:A1993LX57100012 ER PT J AU SIMONEN, EP JONES, RH DANIELSON, MJ AF SIMONEN, EP JONES, RH DANIELSON, MJ TI PREDICTED SALT FILM FORMATION EFFECTS ON STAGE-I STRESS-CORROSION CRACKING OF ANODICALLY POLARIZED NICKEL SO CORROSION SCIENCE LA English DT Article AB Model calculations indicate that a resistive salt film can influence the dissolution-controlled crack growth rate during stage I crack extension. Predicted stage I crack growth rate-stress intensity relationships agree with measured rates for nickel anodically polarized to 900 mV(SCE) in 1N H2SO4. Crack growth rates were measured for increasing stress intensities including both stage I and stage II crack growth. An ionic transport model which accounts for both electromigration through the resistive salt film and Fickian diffusion through the aqueous solution in the crack was used to predict crack growth rates. Predictions were consistent with measured crack growth rates, lengths, opening angles and corrosion rates and expected salt film resistivity for the specific electrochemical conditions used. RP SIMONEN, EP (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PD JUN PY 1993 VL 34 IS 6 BP 899 EP + DI 10.1016/0010-938X(93)90070-W PG 0 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LF336 UT WOS:A1993LF33600003 ER PT J AU GEIDER, RJ GREENE, RM KOLBER, Z MACINTYRE, HL FALKOWSKI, PG AF GEIDER, RJ GREENE, RM KOLBER, Z MACINTYRE, HL FALKOWSKI, PG TI FLUORESCENCE ASSESSMENT OF THE MAXIMUM QUANTUM EFFICIENCY OF PHOTOSYNTHESIS IN THE WESTERN NORTH-ATLANTIC SO DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID CHLOROPHYLL-A FLUORESCENCE; DINOFLAGELLATE GYMNODINIUM-SANGUINEUM; NATURAL PHYTOPLANKTON POPULATIONS; ISOCHRYSIS-GALBANA HAPTOPHYCEAE; MARINE-PHYTOPLANKTON; NITROGEN LIMITATION; IRRADIANCE RELATIONSHIPS; ENERGY-CONVERSION; DIEL PERIODICITY; SYNECHOCOCCUS WH7803 AB The maximum quantum efficiency (phi(II)) of phytoplankton photosystem II photochemistry was assessed using a pump and probe fluorometer on an offshore-onshore transect from the oligotrophic blue waters of the western Sargasso Sea to the eutrophic waters of lower Delaware Bay. Low values of the ratio of variable to maximum fluorescence (F(v)/F(m)) of dark adapted samples provided evidence for reduced quantum efficiences in surface waters (z = 10 m) of the Sargasso Sea. In contrast, higher values of F(v)/F(m) in estuarine samples indicated near maximal phi(II) in lower Delaware Bay, with intermediate values of F(v)/F(m) observed over the continental shelf. Variations of F(v)/F(m) in surface samples (5 or 10 m depth) were associated with changes in hydrographic features that were consistent with the hypothesis that reduced values of phi(II) in Sargasso Sea surface waters were due to nutrient limitation of phytoplankton photosynthetic energy conversion. In contrast, F(v)/F(m) of samples collected from the chlorophyll maximum layer were independent of distance from shore and water mass characteristics. C1 BROOKHAVEN NATL LAB, DIV OCEANOG & ATMOSPHER SCI, UPTON, NY 11973 USA. RP GEIDER, RJ (reprint author), UNIV DELAWARE, COLL MARINE STUDIES, LEWES, DE 19958 USA. RI MacIntyre, Hugh/B-4555-2011; Greene, Richard/G-9685-2013 OI MacIntyre, Hugh/0000-0002-8852-6984; NR 92 TC 77 Z9 79 U1 0 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0967-0637 EI 1879-0119 J9 DEEP-SEA RES PT I JI Deep-Sea Res. Part I-Oceanogr. Res. Pap. PD JUN PY 1993 VL 40 IS 6 BP 1205 EP 1224 DI 10.1016/0967-0637(93)90134-O PG 20 WC Oceanography SC Oceanography GA LK267 UT WOS:A1993LK26700006 ER PT J AU ROSEMOND, AD MULHOLLAND, PJ ELWOOD, JW AF ROSEMOND, AD MULHOLLAND, PJ ELWOOD, JW TI TOP-DOWN AND BOTTOM-UP CONTROL OF STREAM PERIPHYTON - EFFECTS OF NUTRIENTS AND HERBIVORES SO ECOLOGY LA English DT Article DE ALGAE; BIOMASS; ELIMIA; GRAZING; HERBIVORY; NITROGEN; NUTRIENT LIMITATION; PERIPHYTON; PHOSPHORUS; PRODUCTIVITY; SNAILS; STREAM ID WOODLAND STREAM; PHYTOPLANKTON COMMUNITY; EXPLOITATION ECOSYSTEMS; PRIMARY PRODUCTIVITY; LEAF DECOMPOSITION; BRITISH-COLUMBIA; ALGAL COMMUNITY; MOUNTAIN STREAM; ENRICHMENT; PHOSPHORUS AB We conducted two experiments to determine the relative effects of herbivory and nutrients on an algal community in Walker Branch, a stream having effectively two trophic levels: primary producers and herbivorous snails. The first study (I 989), performed in streamside channels, tested the effects of three factors: (1) stream water nitrogen (N), (2) phosphorus (P), and (3) snail grazing, on periphyton biomass, productivity, and community composition. The second study (I 990), conducted in situ, tested the effects of snail grazing and nutrients (N + P). In the 1989 study, nutrients had positive effects, and herbivores had negative effects, on algal biomass (chlorophyll a, ash-free dry mass, total algal biovolume) and primary productivity (area- and chlorophyll-specific). Likewise, both nutrients and snail grazing exerted effects (+ and -, respectively) on biomass measured in the 1990 study (chlorophyll a, algal biovolume). Grazed communities were dominated by chlorophytes and cyanophytes, which were overgrown by diatoms when herbivores were removed. Algal species that were reduced most by herbivores were increased most by nutrient addition, and vice versa, suggesting a trade-off between resistance to herbivory and nutrient-saturated growth rates. Increases in algal biomass and productivity were slight with the addition of either N or P compared to responses observed when both nutrients were added together, suggesting that both nutrients were at growth-limiting levels. The greatest changes in periphyton structure or function were observed when both nutrients were added and simultaneously, grazers were removed, in contrast to lesser effects when nutrients were added under grazed conditions or grazers were removed at low nutrient levels, indicating dual control by both factors. Nutrient addition also positively affected snail growth in both experiments, indicating tight coupling between herbivore and algal growth (top-down effects) and that bottom-up factors that directly affected plant growth could also indirectly affect consumers belonging to higher trophic levels. Indices quantifying the direct effects of top-down factors relative to bottom-up factors (top-down index, TDI) and the importance of interactions between these factors (interaction coefficient, IC) were computed. These indices showed that the relative strength of top-down and bottom-up factors varied among biomass and productivity parameters and that top-down and bottom-up effects, alone, were less important than their combined effects. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP ROSEMOND, AD (reprint author), VANDERBILT UNIV,DEPT BIOL,NASHVILLE,TN 37235, USA. RI Mulholland, Patrick/C-3142-2012 NR 67 TC 295 Z9 300 U1 24 U2 173 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD JUN PY 1993 VL 74 IS 4 BP 1264 EP 1280 DI 10.2307/1940495 PG 17 WC Ecology SC Environmental Sciences & Ecology GA LD022 UT WOS:A1993LD02200029 ER PT J AU VISCO, SJ DEJONGHE, LC AF VISCO, SJ DEJONGHE, LC TI SPECIAL ISSUE - RECHARGEABLE LITHIUM BATTERIES - EDITORIAL SO ELECTROCHIMICA ACTA LA English DT Editorial Material C1 LAWRENCE BERKELEY LAB,DIV MAT RES,BERKELEY,CA 94720. RP VISCO, SJ (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 0 TC 3 Z9 3 U1 1 U2 4 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 JUN PY 1993 VL 38 IS 9 BP 1157 EP 1157 DI 10.1016/0013-4686(93)80045-2 PG 1 WC Electrochemistry SC Electrochemistry GA LF218 UT WOS:A1993LF21800001 ER PT J AU KAUN, TD NELSON, PA REDEY, L VISSERS, DR HENRIKSEN, GL AF KAUN, TD NELSON, PA REDEY, L VISSERS, DR HENRIKSEN, GL TI HIGH-TEMPERATURE LITHIUM SULFIDE BATTERIES SO ELECTROCHIMICA ACTA LA English DT Article DE LITHIUM BATTERY; MOLTEN-SALT ELECTROLYTE; IRON-DISULFIDE ELECTRODE; BIPOLAR BATTERY; ELECTRI-VEHICLE BATTERY ID DJERFISHERITE-LIKE COMPOUND; ELECTRODES; CELLS; ELECTROLYTES AB Bipolar Li-Al/FeS and Li-Al/FeS2 batteries are being developed for electric vehicle (EV) applications by Argonne National Laboratory. Current technology employs a two-phase Li alloy negative electrode, low melting point LiCl-rich LiCl-LiBr-KBr molten salt electrolyte, and either an FeS or an upper-plateau (UP) FeS2 positive electrode. These components are assembled in an ''electrolyte-starved'' bipolar cell configuration. Use of the two-phase Li alloy (alpha + beta Li-Al and Li5Al5Fe2) negative electrode provides in situ overcharge tolerance that renders the bipolar design viable. Employing LiCl rich LiCl-LiBr-KBr electrolyte in ''electrolyte-starved'' cells achieves low-burdened cells that possess low area-specific impedance; comparable to that of flooded cells using LiCl-LiBr-KBr eutectic electrolyte. The combination of dense U.P. FeS2 electrodes and low-melting electrolyte produces a stable and reversible couple, achieving over 1000 cycles in flooded cells, with high power capabilities. In addition, a family of stable chalcogenide ceramic/sealant materials was developed that produce high-strength bonds between a variety of metals and ceramics, which renders lithium/iron sulfide bipolar stacks practical. Bipolar Li-Al/FeS and Li-Al/FeS2 cells and four-cell stacks using these seals are being built and tested in the 13 cm diameter size for EV applications. To date, Li-Al/FeS cells have achieved 240 W kg-1 power at 80% depth of discharge (DOD) and 130 Wh kg-1 energy at the 25 W kg-1 rate. Li-Al/FeS2 cells have attained 400 W kg-1 power at 80% DOD and 180 Wh kg-1 energy at the 30 W kg-1 rate. When cell performance characteristics are used to model full-scale EV and hybrid vehicle (HV) batteries, they are projected to meet or exceed the performance requirements for a large variety of EV and HV applications. RP KAUN, TD (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ELECTROCHEM TECHNOL PROGRAM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 72 TC 48 Z9 53 U1 2 U2 31 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 JUN PY 1993 VL 38 IS 9 BP 1269 EP 1287 DI 10.1016/0013-4686(93)80057-7 PG 19 WC Electrochemistry SC Electrochemistry GA LF218 UT WOS:A1993LF21800013 ER PT J AU LIU, ML VISCO, SJ DEJONGHE, LC AF LIU, ML VISCO, SJ DEJONGHE, LC TI 4-PROBE POLARIZATION TECHNIQUES AND THE APPLICATION TO INVESTIGATIONS OF SOLID-STATE ELECTROCHEMICAL DEVICES SO ELECTROCHIMICA ACTA LA English DT Article DE 4-PROBE; TRANSIENT; POLYORGANODISULFIDE; SOLID-STATE; POLYMER ELECTROLYTE ID REDOX POLYMERIZATION ELECTRODES; BATTERIES AB The application of sequential, bipolar, square-wave, current pulses to a solid-state electrochemical device with two properly positioned reference electrodes, has greatly facilitated the characterization of cell performance. This technique is particularly useful in identifying the rate-limiting step by separation of polarization distributions among cell components. Additional utility of this technique includes fast results and easy data interpretation. In fact, the current pulse sequences can be superimposed on a cell under normal operation to determine the kinetic and transport properties of the electrolyte and electrode materials in situ during cell operation. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT RES,BERKELEY,CA 94720. RI Liu, Meilin/E-5782-2010 OI Liu, Meilin/0000-0002-6188-2372 NR 7 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD JUN PY 1993 VL 38 IS 9 BP 1289 EP 1300 DI 10.1016/0013-4686(93)80058-8 PG 12 WC Electrochemistry SC Electrochemistry GA LF218 UT WOS:A1993LF21800014 ER PT J AU SHELDON, AL MEFFE, GK AF SHELDON, AL MEFFE, GK TI MULTIVARIATE-ANALYSIS OF FEEDING RELATIONSHIPS OF FISHES IN BLACKWATER STREAMS SO ENVIRONMENTAL BIOLOGY OF FISHES LA English DT Article DE DETRENDED CORRESPONDENCE ORDINATION; DIVERSITY; FISH ASSEMBLAGE STRUCTURE; FOOD HABITS; SOUTH-CAROLINA ID DETRENDED CORRESPONDENCE-ANALYSIS; HABITAT STRUCTURE; PUTTING THINGS; ASSEMBLAGE; FOOD; ECOSYSTEM; RIVER; COMMUNITIES; AFRICA; ORDER AB The autumnal diets of 23 fish species in 9 families from South Carolina blackwater streams were characterized by rank order statistics and analyzed by detrended correspondence analysis (DCA). DCA ordinations of fishes and their food items indicate two primary gradients. The first axis contrasts fine particle feeders and omnivores (Catostomidae, some cyprinids) eating algae, detritus, microcrustacea and bivalves, with predators (Anguilla, Esox, large Ameiurus) on decapods and vertebrates. The second is a gradient from benthic feeders (percid darters, Noturus catfishes) with varied invertebrate diets. to taxa (Gambusia, some cyprinids and centrarchids) feeding at the surface. With increasing size, fishes shift to larger prey and increased surface feeding. Much of the trophic differentiation within the assemblage reflects diversification at generic and family levels. DCA is an effective method for summarizing trophic relations in diverse assemblages. C1 UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. RP UNIV MONTANA, DIV BIOL SCI, MISSOULA, MT 59812 USA. NR 53 TC 26 Z9 27 U1 2 U2 9 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0378-1909 EI 1573-5133 J9 ENVIRON BIOL FISH JI Environ. Biol. Fishes PD JUN PY 1993 VL 37 IS 2 BP 161 EP 171 DI 10.1007/BF00000591 PG 11 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA LG567 UT WOS:A1993LG56700006 ER PT J AU WILKINSON, KJ BERTSCH, PM JAGOE, CH CAMPBELL, PGC AF WILKINSON, KJ BERTSCH, PM JAGOE, CH CAMPBELL, PGC TI SURFACE COMPLEXATION OF ALUMINUM ON ISOLATED FISH GILL CELLS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SALMON SALMO-SALAR; FLUORIDE COMPLEXATION; TOXICITY; WATER; ACID; ENVIRONMENT; EQUILIBRIUM; SPECIATION; CHEMISTRY; DILUTE AB Cells from the gills of largemouth bass (Micropterus salmoides) were isolated and exposed to dilute solutions of Al, Al in the presence of fluoride, or Al plus dissolved organic matter (DOM) to determine the cells' metal binding potential in an acidic medium. Microelectrophoresis was employed to monitor the extent of aluminum sorption to cells in the presence of added ligand. In the absence of Al, the gill cells exhibit an appreciable negative charge; Al binding to the cell surface increases the electric potential at the shear plane and leads to a reduction in the cell's (negative) electrophoretic mobility. In the presence of both Al and F, aluminum complexation at the gill surface is only marginally reduced; the formation of a mixed ligand complex, {F-Al-L-cell}, is proposed to account for the observed results. The presence of such ternary complexes was subsequently verified by F-19 nuclear magnetic resonance spectroscopy and by potentiometry. Addition of DOM increased the negative electrophoretic mobility of the isolated gill cells both in the presence and absence of aluminum (7.4 muM). C1 UNIV QUEBEC, INRS EAU, CP 7500, ST FOY G1V 4C7, PQ, CANADA. UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. RI Wilkinson, Kevin/I-4193-2012; Campbell, Peter/H-4348-2011 OI Campbell, Peter/0000-0001-7160-4571 NR 45 TC 38 Z9 40 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X EI 1520-5851 J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD JUN PY 1993 VL 27 IS 6 BP 1132 EP 1138 DI 10.1021/es00043a012 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA LE442 UT WOS:A1993LE44200029 ER PT J AU STEWART, AJ HILL, WR BOSTON, HL AF STEWART, AJ HILL, WR BOSTON, HL TI GRAZERS, PERIPHYTON AND TOXICANT MOVEMENT IN STREAMS SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Letter ID FISH; DYNAMICS; SNAILS RP STEWART, AJ (reprint author), OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. OI stewart, arthur/0000-0003-1968-5997 NR 13 TC 26 Z9 26 U1 0 U2 3 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0730-7268 EI 1552-8618 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD JUN PY 1993 VL 12 IS 6 BP 955 EP 957 DI 10.1897/1552-8618(1993)12[955:GPATMI]2.0.CO;2 PG 3 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA LD034 UT WOS:A1993LD03400001 ER PT J AU GRIEST, WH STEWART, AJ TYNDALL, RL CATON, JE HO, CH IRONSIDE, KS CALDWELL, WM TAN, E AF GRIEST, WH STEWART, AJ TYNDALL, RL CATON, JE HO, CH IRONSIDE, KS CALDWELL, WM TAN, E TI CHEMICAL AND TOXICOLOGICAL TESTING OF COMPOSTED EXPLOSIVES CONTAMINATED SOIL SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE COMPOSTING; EXPLOSIVES; CHEMICAL TOXICOLOGICAL TESTING; MUTAGENICITY AB Static-pile and mechanically stirred composts of explosives-contaminated soil at the Umatilla Army Depot Activity (UMDA, Umatilla, OR) in a field composting optimization study were characterized chemically and toxicologically. The concentrations of extractable explosives (e.g., 2,4,6-trinitrotoluene) in the composts and their aqueous leachates, the mutagenicity of organic solvent extracts from the composts, and the toxicity of compost aqueous leachates to Ceriodaphnia dubia all decreased considerably with 20 d of composting. After 44 d (mechanical composters) or 90 d (static piles) of composting, the toxicity, mutagenicity, and concentrations of extractable explosives decreased more than 90% in some cases. The composting efficiency was generally inversely proportional to the percentage (v/v) of contaminated soil. Composting in static piles was efficient up to about 20% (v/v) of contaminated soil; composting in the mechanically stirred composters was efficient up to about 25% soil. Mechanical composting was more efficient than composting in static piles. The main conclusion of this study is that composting can effectively remediate explosives-contaminated soil and sediment. However, low levels of explosives and metabolites, bacterial mutagenicity, and leachable toxicity to Ceriodaphnia may remain after composting. The sources of residual toxicity and mutagenicity and the ultimate fate of the explosives are unknown. RP GRIEST, WH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI stewart, arthur/0000-0003-1968-5997 NR 17 TC 44 Z9 45 U1 0 U2 5 PU SETAC PRESS PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3370 SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD JUN PY 1993 VL 12 IS 6 BP 1105 EP 1116 DI 10.1897/1552-8618(1993)12[1105:CATTOC]2.0.CO;2 PG 12 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA LD034 UT WOS:A1993LD03400016 ER PT J AU NEWMAN, MC AF NEWMAN, MC TI REGRESSION-ANALYSIS OF LOG-TRANSFORMED DATA - STATISTICAL BIAS AND ITS CORRECTION SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Note DE STATISTICS; REGRESSION; BIAS; LOG-TRANSFORMED VARIABLES ID GAMBUSIA-AFFINIS BAIRD; ORGANIC-CHEMICALS; SIZE-DEPENDENCE; FISH; BIOACCUMULATION; ACCUMULATION; MOSQUITOFISH; PREDICTION; HARDNESS; CRITERIA AB Power and exponential models are used frequently in environmental chemistry and toxicology. Such models can generate biased predictions if derived with least-squares, linear regression of log-transformed variables. An easily calculated but seldom used estimate of bias can enhance the accuracy of subsequent predictions. This prediction bias and means of correcting it are presented, along with several examples. RP NEWMAN, MC (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29801, USA. NR 41 TC 69 Z9 71 U1 1 U2 13 PU SETAC PRESS PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3370 SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD JUN PY 1993 VL 12 IS 6 BP 1129 EP 1133 DI 10.1897/1552-8618(1993)12[1129:RAOLDS]2.0.CO;2 PG 5 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA LD034 UT WOS:A1993LD03400018 ER PT J AU Smith, RE Forrest, S Perelson, AS AF Smith, Robert E. Forrest, Stephanie Perelson, Alan S. TI Searching for Diverse, Cooperative Populations with Genetic Algorithms SO EVOLUTIONARY COMPUTATION LA English DT Article DE genetic algorithms; classifier systems; fitness sharing; computational immunology; multimodal search AB In typical applications, genetic algorithms (GAS) process populations of potential problem solutions to evolve a single population member that specifies an "optimized" solution. The majority of GA analysis has focused on these optimization applications. In other applications (notably learning classifier systems and certain connectionist learning systems), a GA searches for a population of cooperative structures that jointly perform a computational task. This paper presents an analysis of this type of GA problem. The analysis considers a simplified genetics-based machine learning system: a model of an immune system. In this model, a GA must discover a set of pattern-matching antibodies that effectively match a set of antigen patterns. Analysis shows how a GA can automatically evolve and sustain a diverse, cooperative population. The cooperation emerges as a natural part of the antigen-antibody matching procedure. This emergent effect is shown to be similar to fitness sharing, an explicit technique for multimodal GA optimization. Further analysis shows how the GA population can adapt to express various degrees of generalization. The results show how GAS can automatically and simultaneously discover effective groups of cooperative computational structures. C1 [Smith, Robert E.] Univ Alabama, Dept Engn Mech, Tuscaloosa, AL 35487 USA. [Forrest, Stephanie] Univ New Mexico, Dept Comp Sci, Albuquerque, NM 87131 USA. [Perelson, Alan S.] Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Smith, RE (reprint author), Univ Alabama, Dept Engn Mech, Tuscaloosa, AL 35487 USA. EM rob@comec4.mh.ua.edu; forrest@cs.unm.edu; asp@receptor.lanl.gov FU U.S. Department of Energy; Center for Nonlinear Studies, Los Alamos National Laboratory; Santa Fe Institute; National Science Foundation [ECS-9212066, IRI-9157644]; Association of Western Universities; Sandia University [AE-1679]; National Institutes of Health [AI28433] FX This work was partially done under the auspices of the U.S. Department of Energy. We thank the Center for Nonlinear Studies, Los Alamos National Laboratory, and the Santa Fe Institute for support. Smith acknowledges support provided by the National Science Foundation (grant ECS-9212066). Forrest also acknowledges the support of the Association of Western Universities, National Science Foundation (grant IRI-9157644), and Sandia University Research Program (grant AE-1679). Perelson acknowledges the support of the National Institutes of Health (grant AI28433). Brenda Javornik programmed the simulations referred to in this paper; she and Ron Hightower both provided helpful comments on the manuscript. NR 36 TC 105 Z9 108 U1 0 U2 5 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD STREET, CAMBRIDGE, MA 02142 USA SN 1063-6560 J9 EVOL COMPUT JI Evol. Comput. PD SUM PY 1993 VL 1 IS 2 BP 127 EP 149 DI 10.1162/evco.1993.1.2.127 PG 23 WC Computer Science, Artificial Intelligence; Computer Science, Theory & Methods SC Computer Science GA V21YQ UT WOS:000208243300003 ER PT J AU JONES, TD MORRIS, MD YOUNG, RW KEHLET, RA AF JONES, TD MORRIS, MD YOUNG, RW KEHLET, RA TI A CELL-KINETICS MODEL FOR RADIATION-INDUCED MYELOPOIESIS SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE CELL KINETICS; RADIATION RECOVERY; MYELOPOIESIS; HEMATOPOIESIS RADIOTHERAPY ID BONE-MARROW; PROGENITOR CELLS; STEM-CELLS; X-IRRADIATION; MOUSE MARROW; RADIOSENSITIVITY; EXPOSURE; SURVIVAL; NEUTRONS; INVITRO AB A mathematical model of time-dependent cellular damage, repair, killing and repopulation of bone marrow following treatments with ionizing radiations is described. Effects from variable dose rates, multiple exposures, different radiation sources and arbitrary intervals between treatments can be modeled by ordinary differential equations. Of several unique features, the most unusual is that rate constants for injury, repair, killing and proliferation of cells are evaluated by likelihood analysis of animal mortality data. Results indicate that a relatively radioresistant pool of bone marrow cells mediates the proliferation of the hematopoietic stem cells. Applications include modeling of 1) myelopoietic integrity as a function of time and dose rate, 2) the whole-body survival curve (at any point in the treatment protocol) for cells critical to myelopoiesis, 3) a prompt dose equivalence from any completed portion of a therapeutic schedule and 4) potential gain from schedule changes during the course of the treatment. C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. US DEF NUCL AGCY,RADIAT POLICY OFF,WASHINGTON,DC. RP JONES, TD (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,POB 2008,BLDG 4500-S,MS 6101,OAK RIDGE,TN 37831, USA. NR 38 TC 17 Z9 17 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 JUN PY 1993 VL 21 IS 6 BP 816 EP 822 PG 7 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW611 UT WOS:A1993MW61100015 PM 8500579 ER PT J AU CRONKITE, EP INOUE, T HIRABAYASHI, Y BULLIS, J AF CRONKITE, EP INOUE, T HIRABAYASHI, Y BULLIS, J TI ARE STEM-CELLS EXPOSED TO IONIZING-RADIATION IN-VIVO AS EFFECTIVE AS NONIRRADIATED TRANSFUSED STEM-CELLS IN RESTORING HEMATOPOIESIS SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE LTRC; CFU-S; RADIATION EFFECT; STEM CELLS ID BONE-MARROW; IRRADIATED MICE AB Are the stem cells that survive graded doses of ionizing radiation as effective in restoring hematopoiesis in irradiated mice as transfused nonirradiated stem cells? This question was addressed by determining animal dose mortality and 10-day colony-forming units (CFU-S) survival curves and then replotting the percent animal survival against the number of CFU-S surviving the different doses of radiation, and by determining the number of nonirradiated CFU-S injected into fatally irradiated mice that result in a CFU-S dose mortality response curve. The number of CFU-S surviving per mouse after doses of radiation resulting in 95, 50 and 5% animal survival were calculated to be 520, 300 and 153, respectively From the transfused CFU-S dose mortality curve of otherwise fatally irradiated mice (8.5 Gy), the number of transfused normal CFU-S required for 95, 50 and 5% animal survival was estimated to be 153, 24 and 3, respectively. The ratios of surviving CFU-S to nonirradiated, injected CFU-S are: at 95% survival. (6.3 Gy), 3.4; at 50% survival (6.88 Gy), 12.5; and at 5% survival (7.4 Gy), 51.0. These data show that, in addition to a reduced number of CFU-S, as radiation dose increases, the quality of surviving CFU-S responsible for 30-day survival decreases. By implication, the long-term repopulating cell (LTRC) that is now known not to be the 10-day CFU-S must also decrease. C1 YOKOHAMA CITY UNIV,SCH MED,DEPT PATHOL,YOKOHAMA 236,JAPAN. RP CRONKITE, EP (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 21 TC 15 Z9 15 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 JUN PY 1993 VL 21 IS 6 BP 823 EP 825 PG 3 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW611 UT WOS:A1993MW61100016 PM 8500580 ER PT J AU BAILEY, JL VRESK, J ACHARYA, M AF BAILEY, JL VRESK, J ACHARYA, M TI EVALUATION OF THE PERFORMANCE-CHARACTERISTICS OF A THERMAL TRANSIENT ANEMOMETER SO EXPERIMENTS IN FLUIDS LA English DT Article AB This paper describes and evaluates a thermal transient anemometer, a novel fluid flow (mass flux) measuring device having a thermocouple probe which is utilized to measure the change in temperature over a period of time to provide a measure of fluid flow velocity. The thermocouple probe (sensor) is periodically heated by the application of an electrical pulse and its rate of cooling between pulses is related to the local mean flow velocity. The theory of operation, device description, comparison with other similar fluid flow devices, and laboratory tests including measurements under different turbulence levels and different fluid temperatures are presented and discussed. C1 IIT,CHICAGO,IL 60616. RP BAILEY, JL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD JUN PY 1993 VL 15 IS 1 BP 10 EP 16 PG 7 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA LK433 UT WOS:A1993LK43300002 ER PT J AU OHERN, TJ TORCZYNSKI, JR AF OHERN, TJ TORCZYNSKI, JR TI REYNOLDS-NUMBER DEPENDENCE OF THE DRAG COEFFICIENT FOR LAMINAR-FLOW THROUGH FINE-SCALE PHOTOETCHED SCREENS SO EXPERIMENTS IN FLUIDS LA English DT Article ID TURBULENCE AB The laminar steady flow downstream of fine-mesh screens is studied. Instead of woven-wire screens, high-uniformity screens are fabricated by photoetching holes into 50.8 mum thick Inconel sheets. The resulting screens have minimum wire widths of 50.8 mum and inter-wire separations of 254 mum and 318 mum for the two screens examined. A flow facility has been constructed for experiments with these screens. Air is passed through the screens at upstream velocities yielding wire width Reynolds numbers from 2 to 35. To determine the drag coefficient, pressure drops across the screens are measured using pressure transducers and manometers. Three-dimensional flow simulations are also performed. The computational drag coefficients consistently overpredict the experimental values. However, the computational results exhibit sensitivity to the assumed wire cross section, indicating that detailed knowledge of the wire cross section is essential for unambiguous interpretation of experiments using photoetched screens. Standard semi-empirical drag correlations for woven-wire screens do not predict the present experimental results with consistent accuracy. C1 SANDIA NATL LABS,CTR ENGN SCI,ALBUQUERQUE,NM 87185. NR 10 TC 2 Z9 2 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD JUN PY 1993 VL 15 IS 1 BP 75 EP 81 PG 7 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA LK433 UT WOS:A1993LK43300011 ER PT J AU LIN, CQ BISSELL, MJ AF LIN, CQ BISSELL, MJ TI MULTIFACETED REGULATION OF CELL-DIFFERENTIATION BY EXTRACELLULAR-MATRIX SO FASEB JOURNAL LA English DT Review DE FUNCTIONAL DIFFERENTIATION; CELL BEHAVIOR; MAMMARY GLAND; HEPATOCYTES; KERATINOCYTES ID HUMAN EPIDERMAL-KERATINOCYTES; FLOATING COLLAGEN MEMBRANES; MAMMARY EPITHELIAL-CELLS; ADULT-RAT-HEPATOCYTES; ACIDIC PROTEIN GENE; TERMINAL DIFFERENTIATION; BASEMENT-MEMBRANE; ALBUMIN GENE; PRIMARY CULTURES; EXPRESSION AB Extracellular matrix (ECM) is an intricate network composed of an array of macromolecules, the importance of which is becoming increasingly apparent. The ECM is an integral part of the machinery that regulates cell function; its role in cell differentiation and tissue-specific gene expression, although essential, is not yet understood. It can act as a positive as well as a negative regulator of functional differentiation depending on the cell type and the genes studied. It also acts in a hierarchical fashion, exacting higher and higher degrees of stringency to achieve full functional differentiation. Regulation by ECM is closely interrelated with the action of other regulators of cellular function, such as growth factors and hormones. But ECM may exert its regulation of gene expression by mechanisms distinct from those known for soluble transcription factors. In this short review, we describe three systems in which ECM has been shown to play a crucial role in functional differentiation, but we emphasize mainly the work from our own laboratory to provide a more in-depth analysis of one system. The three systems are: mouse mammary epithelial cells, rat hepatocytes, and human keratinocytes. The crucial role of ECM in normal cell differentiation implies that its alteration may have serious consequences in malignancies and other diseases. The current functional cell culture models could provide powerful tools not only for understanding regulation of normal cell function but also for the studies of tumorigenesis and possibly cancer therapy. RP LIN, CQ (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. NR 47 TC 492 Z9 500 U1 2 U2 19 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 JUN PY 1993 VL 7 IS 9 BP 737 EP 743 PG 7 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA LK430 UT WOS:A1993LK43000005 PM 8330681 ER PT J AU EVANS, RW MANNINEN, DL DONG, FB AF EVANS, RW MANNINEN, DL DONG, FB TI AN ECONOMIC-ANALYSIS OF LIVER-TRANSPLANTATION - COSTS, INSURANCE-COVERAGE, AND REIMBURSEMENT SO GASTROENTEROLOGY CLINICS OF NORTH AMERICA LA English DT Article ID MEDICARE-DESIGNATED CENTERS; PROSPECTIVE PAYMENT SYSTEM; HEALTH-CARE TECHNOLOGY; CARDIAC TRANSPLANTATION; HEPATIC TRANSPLANTATION; ORGAN-TRANSPLANTATION; HEART-TRANSPLANTATION; RESOURCE-ALLOCATION; RATIONING DECISIONS; LIMITED RESOURCES C1 BATTELLE SEATTLE RES CTR,SEATTLE,WA. RP EVANS, RW (reprint author), MAYO CLIN & MAYO FDN,DEPT HLTH SCI RES,HLTH SERV EVALUAT SECT,ROCHESTER,MN 55905, USA. RI Embrett, Mark/H-4466-2014 OI Embrett, Mark/0000-0002-3969-0219 NR 87 TC 85 Z9 85 U1 1 U2 3 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0889-8553 J9 GASTROENTEROL CLIN N JI Gastroenterol. Clin. North Am. PD JUN PY 1993 VL 22 IS 2 BP 451 EP 473 PG 23 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA LE172 UT WOS:A1993LE17200016 PM 8509177 ER PT J AU LONGMIRE, JL BROWN, NC MEINCKE, LJ CAMPBELL, ML ALBRIGHT, KL FAWCETT, JJ CAMPBELL, EW MOYZIS, RK HILDEBRAND, CE EVANS, GA DEAVEN, LL AF LONGMIRE, JL BROWN, NC MEINCKE, LJ CAMPBELL, ML ALBRIGHT, KL FAWCETT, JJ CAMPBELL, EW MOYZIS, RK HILDEBRAND, CE EVANS, GA DEAVEN, LL TI CONSTRUCTION AND CHARACTERIZATION OF PARTIAL DIGEST DNA LIBRARIES MADE FROM FLOW-SORTED HUMAN CHROMOSOME-16 SO GENETIC ANALYSIS-BIOMOLECULAR ENGINEERING LA English DT Article ID HUMAN X-CHROMOSOME; HIGH-RESOLUTION; PHYSICAL MAP; GENE; SEQUENCE AB In this report, we present the techniques used for the construction of chromosome-specific partial digest libraries from flow-sorted chromosomes and the characterization of two such libraries from human chromosome 16. These libraries were constructed to provide materials for use in the development of a high-resolution physical map of human chromosome 16, and as part of a distributive effort on the National Laboratory Gene Library Project. Libraries with 20-fold coverage were made in Charon-40 (LA16NL03) and in sCos-1 (LA16NC02) after chromosome 16 was sorted from a mouse-human monochromosomal hybrid cell line containing a single homologue of human chromosome 16. Both libraries are approximately 90% enriched for human chromosome 16, have low nonrecombinant backgrounds, and are highly representative for human chromosome-16 sequences. The cosmid library in particular has provided a valuable resource for the isolation of coding sequences, and in the ongoing development of a physical map of human chromosome 16. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. SALK INST BIOL STUDIES,MOLEC BIOL LAB,LA JOLLA,CA 92037. RP LONGMIRE, JL (reprint author), LOS ALAMOS NATL LAB,STRUCT BIOL & GENOM GRP,MAIL STOP M 880,LOS ALAMOS,NM 87545, USA. FU NHGRI NIH HHS [HG00202] NR 36 TC 53 Z9 54 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1050-3862 J9 GENET ANAL-BIOMOL E JI Genet. Anal.-Biomol. Eng. PD JUN-AUG PY 1993 VL 10 IS 3-4 BP 69 EP 76 DI 10.1016/1050-3862(93)90037-J PG 8 WC Biochemical Research Methods; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA ML421 UT WOS:A1993ML42100001 PM 8110480 ER PT J AU HORITA, J WESOLOWSKI, DJ COLE, DR AF HORITA, J WESOLOWSKI, DJ COLE, DR TI THE ACTIVITY-COMPOSITION RELATIONSHIP OF OXYGEN AND HYDROGEN ISOTOPES IN AQUEOUS SALT-SOLUTIONS .1. VAPOR-LIQUID WATER EQUILIBRATION OF SINGLE SALT-SOLUTIONS FROM 50-DEGREES-C TO 100-DEGREES-C SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID DEUTERIUM FRACTIONATION; O-18; TEMPERATURES; BRINES AB The differences between oxygen and hydrogen isotope activity and composition ratios of water in single salt solutions (NaCl, KCl, MgCl2, CaCl2, Na2SO4, and MgSO4) were determined by means of a vapor-liquid water equilibration method over the temperature range of 50 to 100-degrees-C. A parallel equilibration technique of pure water and salt solutions with the same isotopic composition at the same experimental conditions enabled the precise determination of the isotope salt effects. Hydrogen isotope activity ratios of all of the salt solutions studied were appreciably higher than composition ratios. That is, D/H ratio of water vapor in isotope equilibrium with a solution increases as salt is added to the solution. Magnitudes of the hydrogen isotope effects are in the order CaCl2 greater-than-or-equal-to MgCl2 > MgSO4 > KCl almost-equal-to NaCl > Na2SO4 at the same molality. Except for KCl solutions at 50-degrees-C, oxygen isotope activity ratios in the solutions were lower than, or very close to, the composition ratios. The isotope effects observed are all linear with the molalities of the salt solutions, and either decrease with temperature or are almost constant over the temperature range. Salt solutions of divalent cations (Ca and Mg) exhibited oxygen isotope effects much larger than those of monovalent cations (Na and K). Magnitudes of the oxygen isotope effects in NaCl solutions, and of the hydrogen isotope effects in Na2SO4 and MgSO4 solutions, may increase from 50 to 100-degrees-C. Our results agree with most of those from the literature near room temperature, but are at notable variance with those by TRUESDELL (1974) around 100-degrees-C. The results in this study and the literature data near room temperature were satisfactorily fitted to simple equations as a function of concentration of the salt solutions and temperature. RP HORITA, J (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 35 TC 89 Z9 95 U1 3 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD JUN PY 1993 VL 57 IS 12 BP 2797 EP 2817 DI 10.1016/0016-7037(93)90391-9 PG 21 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LJ983 UT WOS:A1993LJ98300009 ER PT J AU ALBRECHT, A HERZOG, GF KLEIN, J DEZFOULYARJOMANDY, B GOFF, F AF ALBRECHT, A HERZOG, GF KLEIN, J DEZFOULYARJOMANDY, B GOFF, F TI QUATERNARY EROSION AND COSMIC-RAY-EXPOSURE HISTORY DERIVED FROM BE-10 AND AL-26 PRODUCED INSITU - AN EXAMPLE FROM PAJARITO PLATEAU, VALLES CALDERA REGION SO GEOLOGY LA English DT Article ID SURFACES; RATES AB Be-10 and Al-26 concentrations measured by accelerator mass spectrometry in 20 samples Of quartz separated from rhyolitic volcanic ash-flow tuffs collected on the Pajarito plateau of the Valles caldera, New Mexico, were used to model time-integrated erosion rates and cosmic-ray-exposure histories. The model erosion rates determined for different stratigraphic units within the Tshirege member, upper Bandelier Tuff, vary from 0.1 cm/ka for the resistant unit to 1.1 cm/ka for the softer unit. Intermediate erosion rates are thought to indicate earlier age cover by post-tuff lithologies of different hardness. The geographic distribution of these intermediate rates allows an approximate determination of the extent of material now gone (stratigraphic ghosts). Periods of burial can be determined from Al-26/Be-10 ratios. For the Pajarito plateau, burial most likely resulted from cover by soil and sediment held in place by vegetation. Our data allow us to model the duration and extent of thick forest cover, which today exists only C1 UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ALBRECHT, A (reprint author), RUTGERS UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08903, USA. RI Klein, Jeffrey/E-3295-2013 NR 8 TC 15 Z9 17 U1 0 U2 2 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD JUN PY 1993 VL 21 IS 6 BP 551 EP 554 DI 10.1130/0091-7613(1993)021<0551:QEACRE>2.3.CO;2 PG 4 WC Geology SC Geology GA LF899 UT WOS:A1993LF89900018 ER PT J AU VASCO, DW PULLIAM, RJ JOHNSON, LR AF VASCO, DW PULLIAM, RJ JOHNSON, LR TI FORMAL INVERSION OF ISC ARRIVAL TIMES FOR MANTLE P-VELOCITY STRUCTURE SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE INVERSION; ISC; MANTLE ID TRAVEL TIMES; TAU METHOD; TOMOGRAPHY; HETEROGENEITY; PLATE AB Seismic traveltime data are used to determine and assess a weighted least-squares model of the 3-D P-velocity structure of the Earth's mantle. A total of 682 090 summary rays constructed from over three million ISC traveltime observations are used to constrain velocity perturbations in 124966-degrees by 6-degrees cells. An iterative block LU decomposition procedure, applied on the massively parallel Connection Machine 2 (CM-2), is used to compute a formal weighted least-squares model of P-velocity variations as well as the full resolution and covariance matrices. It is found that the shallow mantle beneath the continents of the northern hemisphere is well resolved. However, the majority of mid-oceanic features, such as spreading ridges and hot spots, are not well constrained. As a function of depth, the resolution is highest in the upper to mid-mantle, due to variations in ray coverage. Primarily because of ray geometry, single blocks are not resolved below 1870 km. The estimates of spatial resolution, constructed from the complete resolution matrix, are useful in judging whether subducting lithosphere extends into the lower mantle. The results indicate that possible extensions of subduction zones in the northern hemisphere are imaged reliably down to at least 1470 km. However, areas beneath most subduction zones in the southern hemisphere are averaged over scale lengths of 800 km or more below a depth of 1070 km. Velocity estimates for the mid to lower mantle beneath Hawaii are the result of averaging over 1900 km or more. Generally, vertical and lateral averaging of 600 to 1000 km is occurring in the depth range 2270 to 2670 km. P-wave velocity values in the region just above the Core-Mantle Boundary (CMB) are large-scale spatial averages (1500 km or more) and individual cells are poorly resolved. The model parameter standard error remains moderate throughout the lower mantle due to smaller traveltime errors associated with rays that bottom in this region. These standard errors reach no more than 0.3 per cent of the Jeffreys-Bullen average velocity. The greatest standard errors, 0.9 per cent of the average velocity, are found in the upper mantle underlying the Pacific basin. These large parameter errors are due primarily to the poor ray coverage in the Pacific coupled with the large arrival-time uncertainties for P recordings in the epicentral distance range 0-degrees to 20-degrees. The upper 200 km of the weighted least-squares velocity model correlates strongly with known tectonic features. A circum-Pacific ring of low velocity, with a maximum of 2 per cent, dominates the surface anomalies. The most likely origin of this feature are the high temperatures associated with back-arc magmatism. The most conspicuous mid-ocean velocity anomaly is Iceland, which appears as a strong low velocity region extending over many cells. Continental cratons appear as positive velocity (1-2 per cent) anomalies extending to depths of 200 to 400 km. Low velocities underly the continents of Eurasia and North America at a depth range of 400 to 670 km. In the mid-mantle, 670 to 1270 km deep, a 1-2 per cent fast velocity anomaly encircles the region below the Pacific basin. A fast anomaly also underlies India, in the depth range 870-1470 km, perhaps associated with the convergence of India and Eurasia. C1 LAWRENCE BERKELEY LAB,CTR COMPUTAT SEISMOL,BERKELEY,CA 94720. RP VASCO, DW (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. RI Vasco, Donald/I-3167-2016; OI Vasco, Donald/0000-0003-1210-8628; Pulliam, Robert/0000-0001-7661-359X NR 36 TC 19 Z9 19 U1 0 U2 0 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 JUN PY 1993 VL 113 IS 3 BP 586 EP 606 DI 10.1111/j.1365-246X.1993.tb04654.x PG 21 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LE036 UT WOS:A1993LE03600004 ER PT J AU LEE, KH XIE, GQ AF LEE, KH XIE, GQ TI A NEW APPROACH TO IMAGING WITH LOW-FREQUENCY ELECTROMAGNETIC-FIELDS SO GEOPHYSICS LA English DT Article ID MAGNETOTELLURIC DATA; INVERSION; MODELS AB We present a new method for interpreting electromagnetic (EM) data using ray tomography. Direct application of ray tomography to low-frequency EM data is difficult because of the diffusive nature of the field. Diffusive EM fields can, however, be mathematically transformed to wavefields defined in a time-like variable. The transform uniquely relates a field satisfying a diffusion equation in time, or in frequency, to an integral of the corresponding wavefield. If the corresponding wavefields can be computed from low-frequency EM data, one should be able to interpret these data using techniques developed for the wavefields. To test the idea, numerically calculated transient magnetic fields were first transformed to wavefields. The typical window of the time-domain data required for the transform is 1.5 decades. Traveltimes from a source to the receivers were estimated from the reconstructed wavefields. Time-domain data with a Gaussian noise of 3 percent gave a traveltime resolution of better than one percent. For the tomographic inversion, the cross-section between the transmitter and receiver boreholes is divided into a number of rectangular elements, and a continuous slowness is assigned to each of these elements. A functional is formulated by invoking Fermat's principle for the traveltime data. Imposing a stationary condition on the functional gives an iterative procedure for the slowness model. Rays are allowed to bend smoothly within each cell. Incorporating smoothly bending rays is extremely important when the velocity contrast is large. A model with a conductivity contrast of ten (10) has been successfully imaged in 120 iterations with 5 CPU hours on a SUN SPARCstation 2. RP LAWRENCE BERKELEY LAB, DIV EARTH SCI, 50E, BERKELEY, CA 94720 USA. NR 20 TC 46 Z9 57 U1 2 U2 5 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 USA SN 0016-8033 EI 1942-2156 J9 GEOPHYSICS JI Geophysics PD JUN PY 1993 VL 58 IS 6 BP 780 EP 796 DI 10.1190/1.1443464 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LG786 UT WOS:A1993LG78600001 ER PT J AU SELLERS, P SCHIMEL, D AF SELLERS, P SCHIMEL, D TI REMOTE-SENSING OF THE LAND BIOSPHERE AND BIOGEOCHEMISTRY IN THE EOS ERA - SCIENCE PRIORITIES, METHODS AND IMPLEMENTATION - EOS LAND BIOSPHERE AND BIOGEOCHEMICAL CYCLES PANELS SO GLOBAL AND PLANETARY CHANGE LA English DT Article ID FOREST ECOSYSTEMS; CLIMATE CHANGE; MODEL; NITROGEN; CO2; RESPIRATION; CARBON C1 COLORADO STATE UNIV, NREL, FT COLLINS, CO 80523 USA. RP SELLERS, P (reprint author), NASA, GODDARD SPACE FLIGHT CTR, 923, GREENBELT, MD 20771 USA. NR 27 TC 53 Z9 58 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8181 J9 GLOBAL PLANET CHANGE JI Glob. Planet. Change PD JUN PY 1993 VL 7 IS 4 BP 279 EP 297 DI 10.1016/0921-8181(93)90002-6 PG 19 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA LL090 UT WOS:A1993LL09000002 ER PT J AU TRUMBORE, SE AF TRUMBORE, SE TI COMPARISON OF CARBON DYNAMICS IN TROPICAL AND TEMPERATE SOILS USING RADIOCARBON MEASUREMENTS SO GLOBAL BIOGEOCHEMICAL CYCLES LA English DT Article ID ORGANIC-MATTER; FOREST SOIL; C-14; CHRONOSEQUENCE; NITROGEN; COMPLEXES; MOVEMENT; TURNOVER; ZEALAND; STORAGE AB The magnitude and timing of the response of the soil carbon reservoir to changes in land use or climate is a large source of uncertainty in global carbon cycle models. One method of assessing soil carbon dynamics, based on modeling the observed increase of C-14 in organic matter pools during the 30 years since atmospheric weapons testing ended, is described in this paper. Differences in the inventory and residence time of carbon are observed in organic matter from soils representing tropical (Amazon Basin, Brazil) and temperate (western slope of the Sierra Nevada mountains, California) forest ecosystems. The majority of the organic carbon in the upper 22 cm of the tropical soil (7.1 kgC m-2) has residence times of 10 years or less, with a minor component of very refractory carbon. The estimated annual flux of carbon into and out of the soil organic matter in this horizon of the mineral soil, based on modeling of the C-14 data, is between 1.9 and 5.5 kgC m-2 yr-1. In contrast, organic matter in the temperate soil over a similar depth interval (0-23 cm; 5.2 kgC m-2), is made up of approximately equal amounts of carbon with residence times of 10, 100, and 1000 years. The estimated annual flux of carbon into and out of this soil is 0.22 to 0.45 kgC m-2 yr-1. Rapid turnover of organic matter with density <1.6 - 2.0 g cm-3 contributes a major component of the annual flux of carbon into and out of both soil types. Hydrolysis of mineral soil organic matter of density > 1.6-2.0 g cm-3 removed C-14-enriched components from the temperate soil but had no effect on the C-14 content of the residue in 0 - 22 cm layer of the tropical soil. The results presented here show that carbon cycle models which treat soil carbon dynamics as a single reservoir with a turnover rate based on radiocarbon measurements of bulk soil organic matter underestimate the annual fluxes of organic matter through the soil organic matter pool, particularly in tropical regions. C1 LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550. RI Trumbore, Susan/B-1948-2013 NR 64 TC 269 Z9 284 U1 8 U2 74 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0886-6236 J9 GLOBAL BIOGEOCHEM CY JI Glob. Biogeochem. Cycle PD JUN PY 1993 VL 7 IS 2 BP 275 EP 290 DI 10.1029/93GB00468 PG 16 WC Environmental Sciences; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric Sciences GA LG784 UT WOS:A1993LG78400004 ER PT J AU PENG, TH MAIERREIMER, E BROECKER, WS AF PENG, TH MAIERREIMER, E BROECKER, WS TI DISTRIBUTION OF SI-32 IN THE WORLD OCEAN - MODEL COMPARED TO OBSERVATION SO GLOBAL BIOGEOCHEMICAL CYCLES LA English DT Article ID CARBON-CYCLE; PROFILES AB Calculations of the Si-32/SiO2 ratio obtained in ocean models are compared with measurements of this ratio made as part of the GEOSECS program (Somayajulu et al., 1987, 1991). A major difference is found; while the models predict threefold to fivefold higher ratios in the deep Atlantic Ocean than in the deep Pacific and Indian oceans, no such difference is seen in the measurements. This points to a flaw in the measurements. Our modeling results suggest that the most interesting application for this 120-year half-life cosmogenic isotope is as a monitor of upwelling. However, considering the expense and difficulty associated with Si-32 measurements, such studies may prove impractical. C1 MAX PLANCK INST METEOROL,HAMBURG,GERMANY. COLUMBIA UNIV,LAMONT DOHERTY EARTH OBSERV,PALISADES,NY 10964. RP PENG, TH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37830, USA. NR 9 TC 11 Z9 11 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0886-6236 J9 GLOBAL BIOGEOCHEM CY JI Glob. Biogeochem. Cycle PD JUN PY 1993 VL 7 IS 2 BP 463 EP 474 DI 10.1029/93GB00686 PG 12 WC Environmental Sciences; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric Sciences GA LG784 UT WOS:A1993LG78400014 ER PT J AU BROWN, JJ ERICKSON, MD BESKID, NJ AF BROWN, JJ ERICKSON, MD BESKID, NJ TI APPLYING MEMBRANE TECHNOLOGY TO AIR STRIPPING EFFLUENT FOR REMEDIATION OF GROUNDWATER CONTAMINATED WITH VOLATILE ORGANIC-COMPOUNDS SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB Remediation groundwater contaminated by volatile organic compounds (VOCs) requires cost- and technically-effective solutions. This paper reviews the options for VOC removal from remediation air streams, focusing on membrane separation. The basic separation science and technology, results of performance tests, and results of cost studies for membrane separation are presented. Competing technologies are discussed and compared with membrane separation. Membrane separation combined with air stripping will provide an economically and environmentally safe technology for remediation of VOC-contaminated groundwater and, as it matures, may become the preferred method. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439. NR 0 TC 9 Z9 9 U1 0 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 SUM PY 1993 VL 10 IS 3 BP 335 EP 345 DI 10.1089/hwm.1993.10.335 PG 11 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA MD220 UT WOS:A1993MD22000006 ER PT J AU GILBERT, ES OMOHUNDRO, E BUCHANAN, JA HOLTER, NA AF GILBERT, ES OMOHUNDRO, E BUCHANAN, JA HOLTER, NA TI MORTALITY OF WORKERS AT THE HANFORD SITE - 1945-1986 SO HEALTH PHYSICS LA English DT Article DE MORTALITY; CANCER; RADIATION DOSE; RISK ESTIMATES ID NUCLEAR FACILITY; RADIATION; EMPLOYEES; PLANT AB Updated analyses of mortality of workers at the Hanford site provide little evidence of a positive correlation of cumulative occupational radiation dose and mortality from leukemia and from all cancer except leukemia. Estimates of the excess relative risk per 10 mSv were negative for both disease categories, but these estimates are consistent both with no risk and with estimates obtained through extrapolation from high-dose data. For all cancer except leukemia, the upper limit for a two-sided 90% confidence interval was about 1.5 times the prediction of the BEIR V model, but several times the estimate recommended by the ICRP 60 committee. For leukemia, the comparable upper limit was very close to that predicted by either BEIR V or ICRP 60. The all-cancer risk estimate, from a recent report on updated analyses of data for Oak Ridge National Laboratory workers, was strongly rejected based on the Hanford data. Of 24 specific cancer categories evaluated, only cancer of the pancreas and Hodgkin's disease showed positive correlations with radiation dose that approached statistical significance with one-tailed p values of 0.07 and 0.04, respectively; these correlations are interpreted as probably spurious. For multiple myeloma, for which a correlation was reported previously, the p value was 0.10. However, a significant correlation (p < .05) was obtained when analyses were expanded to include deaths with multiple myeloma listed on the death certificate but not considered to be the underlying cause, when analyses were expanded to include deaths occurring in Washington State during the time period 1987-1989, or when a 2-y latency period (instead of 10-y) was assumed. C1 HANFORD ENVIRONM HLTH FDN, RICHLAND, WA 99352 USA. RP GILBERT, ES (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 26 TC 79 Z9 79 U1 1 U2 3 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUN PY 1993 VL 64 IS 6 BP 577 EP 590 DI 10.1097/00004032-199306000-00001 PG 14 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 LC965 UT WOS:A1993LC96500001 PM 8491612 ER PT J AU HUI, TE JAMES, AC JOSTES, RF SCHWARTZ, JL SWINTH, KL CROSS, FT AF HUI, TE JAMES, AC JOSTES, RF SCHWARTZ, JL SWINTH, KL CROSS, FT TI EVALUATION OF AN ALPHA-PROBE DETECTOR FOR INVITRO CELLULAR DOSIMETRY SO HEALTH PHYSICS LA English DT Article DE DOSIMETRY, MICROPARTICLES; ALPHA-PARTICLES; RADIATION DOSE; DETECTOR, ALPHA-TRACK ID IRRADIATION; PARTICLES; CELLS; RADON AB This paper describes the design and testing of an alpha probe detector for the continuous measurement of the activity concentrations of alpha emitters in the culture media of in vitro cell suspension irradiation systems. The probe detector consists of a pen-size body housing a small silicon surface-barrier detector with a Mylar window. Theoretical calculations were performed to study the dependence of the alpha-energy spectrum on 1) the thickness of the Mylar barrier; 2) the Mylar-detector distance; and 3) the size of the detector window. These design parameters were selected by taking a compromise between the counting efficiency, the integrity of the detector, and its required range of application. The probe detector was tested using both chelated and unchelated Bi-212 and Pb-212 standard solutions; plate-out of these radionuclides on the Mylar barrier was observed for unchelated solutions. Alpha energy spectra were analyzed using a total integration technique. The measured activity concentrations and the calibrated values agree to within 4% for the chelated B-212 and to within 6% for the unchelated Bi-212. The alpha probe detector can be used throughout an entire exposure time period to determine the total dose received by suspended cells, or at different time intervals to determine the dose rate in real time. C1 ARGONNE NATL LAB, DIV BIOL & MED RES, ARGONNE, IL 60439 USA. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. RP HUI, TE (reprint author), PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA 99352 USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUN PY 1993 VL 64 IS 6 BP 647 EP 652 DI 10.1097/00004032-199306000-00011 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LC965 UT WOS:A1993LC96500011 PM 8491621 ER PT J AU JOSTES, RF HUI, TE CROSS, FT AF JOSTES, RF HUI, TE CROSS, FT TI SINGLE-CELL GEL TECHNIQUE SUPPORTS HIT PROBABILITY-CALCULATIONS SO HEALTH PHYSICS LA English DT Note DE MICRODOSIMETRY; RADON PROGENY; ALPHA-PARTICLES; EXPOSURE, RADIATION ID MAMMALIAN-CELLS AB We have used the alkaline single-cell gel technique to provide a biological estimate of the percentage of cell nuclei ''hit'' by alpha particles during in vitro radon exposure. The single-cell gel electrophoretic technique measures DNA strand breaks as increased migration of the DNA out of lysed cells embedded in the middle layer of a three-layer gel formed on a microscope slide. Two of the advantages of this system are that individual cells of an exposed population can be evaluated and that histograms can be constructed to estimate the population response. Chinese hamster ovary and A(L) cells were each exposed to 0.39 Gy of radon, a dose at which our dosimetry model predicts that 63 and 73%, respectively, of the cell nuclei will be traversed by an alpha particle. The difference in the percentages at similar doses is mainly due to the larger nucleus volume in A(L) cells. A 1.5-Gy x-ray response was also evaluated as a low-LET control. As expected, the x-ray profile of DNA damage was shifted from the nonirradiated profile in the direction of greater DNA migration and approximated a normal distribution. The profile of the radon-exposed cells was biphasic, with one distribution corresponding to the control (nonirradiated) response and the other profile showing increased DNA migration. We interpret the second profile in the biphasic profile as representing cell nuclei that had received an alpha ''hit.'' The percentages of cell nuclei in the ''hit'' category (approximately 51 and 45% for CHO and A(L), respectively), as judged by the single-cell gel technique, were 81 and 62% of the calculated values. C1 PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA 99352 USA. RP JOSTES, RF (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 9 TC 20 Z9 21 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUN PY 1993 VL 64 IS 6 BP 675 EP 679 DI 10.1097/00004032-199306000-00016 PG 5 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 LC965 UT WOS:A1993LC96500016 PM 8387986 ER PT J AU CHOI, WK TORMA, AE OHLINE, RW GHALI, E AF CHOI, WK TORMA, AE OHLINE, RW GHALI, E TI ELECTROCHEMICAL ASPECTS OF ZINC-SULFIDE LEACHING BY THIOBACILLUS-FERROOXIDANS SO HYDROMETALLURGY LA English DT Article AB It is proposed that the bioleachability of a zinc sulfide flotation concentrate is influenced by the electrochemical behavior of ZnS. The overall reaction of bio-oxidation: ZnS+ 2O2 bacteria --> ZnSO4 was found to involve a number of intermediate electrochemical reactions, as indicated by the cyclic voltammetric measurements using carbon paste-ZnS working electrodes. The solubilization of ZnS during leaching is solid-state diffusion controlled, as indicated by chronopotentiometric and chronoamperometric measurements. The activation energy of the solid-state-diffusion process was determined by Sand's method to be 21.3 kJ. C1 UNIV LAVAL,DEPT MINING & MET,QUEBEC CITY G1K 7P4,QUEBEC,CANADA. EG&G IDAHO INC,INEL,IDAHO FALLS,ID 83415. NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801. NEW MEXICO INST MIN & TECHNOL,DEPT CHEM,SOCORRO,NM 87801. NR 24 TC 37 Z9 41 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-386X J9 HYDROMETALLURGY JI Hydrometallurgy PD JUN PY 1993 VL 33 IS 1-2 BP 137 EP 152 DI 10.1016/0304-386X(93)90010-B PG 16 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LG093 UT WOS:A1993LG09300009 ER PT J AU KHARE, BN THOMPSON, WR CHENG, L CHYBA, C SAGAN, C ARAKAWA, ET MEISSE, C TUMINELLO, PS AF KHARE, BN THOMPSON, WR CHENG, L CHYBA, C SAGAN, C ARAKAWA, ET MEISSE, C TUMINELLO, PS TI PRODUCTION AND OPTICAL-CONSTANTS OF ICE THOLIN FROM CHARGED-PARTICLE IRRADIATION OF (1/6) C2H6/H2O AT 77-K SO ICARUS LA English DT Article ID COMET HALLEY; ORGANIC GRAINS; X-RAY; EMISSION; METHANE; DUST C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. RP KHARE, BN (reprint author), CORNELL UNIV,PLANETARY STUDIES LAB,ITHACA,NY 14853, USA. RI Cheng, Likwan/C-1436-2013 NR 41 TC 88 Z9 88 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 0019-1035 J9 ICARUS JI Icarus PD JUN PY 1993 VL 103 IS 2 BP 290 EP 300 DI 10.1006/icar.1993.1071 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LK928 UT WOS:A1993LK92800006 ER PT J AU PIERCE, DG BRUSIUS, PG AF PIERCE, DG BRUSIUS, PG TI CORRELATION BETWEEN HIGHLY AND MODERATELY ACCELERATED ELECTROMIGRATION TESTS SO IEEE ELECTRON DEVICE LETTERS LA English DT Article AB Electromigration testing at the wafer level under very highly accelerated stress conditions offers the potential for significant savings in cost and test time over less accelerated package-level tests. However, the extremely large current densities and high temperatures used to achieve that acceleration add uncertainties in extrapolating test results to operating conditions. Also, the possibility exists that failure mechanisms other than those of interest may be excited. This letter presents data showing good correlation between wafer- and package-level electromigration test results for a particular metal system, namely, Al-Cu(2 wt%) with a TiW top and bottom layer. C1 HONEYWELL INC,CTR SOLID STATE ELECTR,PLYMOUTH,MN 55441. RP PIERCE, DG (reprint author), SANDIA NATL LABS,DEPT RELIABIL PHYS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 12 Z9 12 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 JUN PY 1993 VL 14 IS 6 BP 277 EP 279 DI 10.1109/55.215197 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA LD714 UT WOS:A1993LD71400001 ER PT J AU WARNOW, T AF WARNOW, T TI COMBINATORIAL OPTIMIZATION IN BIOLOGY SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Editorial Material RP WARNOW, T (reprint author), SANDIA NATL LABS,DEPT DISCRETE ALGORITHMS & MATH,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD JUN PY 1993 VL 12 IS 2 BP 91 EP 92 DI 10.1109/51.215060 PG 2 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA LF437 UT WOS:A1993LF43700021 ER PT J AU LOTT, JA SCHNEIDER, RP ZOLPER, JC MALLOY, KJ AF LOTT, JA SCHNEIDER, RP ZOLPER, JC MALLOY, KJ TI ALGAINP VISIBLE RESONANT-CAVITY LIGHT-EMITTING-DIODES SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID LASERS AB Visible (670 nm) resonant cavity light-emitting diodes (RCLED's) composed entirely of AlGaInP alloys are reported. The devices consist of a strained quantum well optical cavity active region surrounded by AlInP/(AlGa)InP distributed Bragg reflectors (DBR's). The bottom DBR is a 60.5 period high reflector while the top partial reflector, which determines the emission linewidth, is a five-period output coupling DBR with a reflectance of about 57%. The devices exhibit linewidths of 4.8 nm (13.3 meV) at 300 K and are promising for plastic fiber communication systems and monochromatic displays. C1 UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT ELECT & COMP ENGN,ALBUQUERQUE,NM 87131. RP LOTT, JA (reprint author), SANDIA NATL LABS,COMPOUND SEMICOND RES LAB,ALBUQUERQUE,NM 87185, USA. RI Malloy, Kevin/E-5994-2010 NR 15 TC 20 Z9 20 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD JUN PY 1993 VL 5 IS 6 BP 631 EP 633 DI 10.1109/68.219692 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA LK182 UT WOS:A1993LK18200016 ER PT J AU SUPEK, S AINE, CJ AF SUPEK, S AINE, CJ TI SIMULATION STUDIES OF MULTIPLE DIPOLE NEUROMAGNETIC SOURCE LOCALIZATION - MODEL ORDER AND LIMITS OF SOURCE RESOLUTION SO IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING LA English DT Article ID MAGNETIC LOCALIZATION; FIELDS AB Numerical simulation studies were performed using a multiple dipole source model and a spherical approximation of the head to examine how the resolution of simultaneously active neuromagnetic sources depends upon: 1) source modeling assumptions (i.e., number of assumed dipoles); 2) actual source parameters (e.g., location, orientation, and moment); and 3) measurement errors. Forward calculations were conducted for a series of source configurations in which the number of dipoles, specific dipole parameters, and noise levels were systematically varied. Simulated noisy field distributions were fit by multiple dipole models of increasing model order (1, 2,..., 6 and alternative statistical approaches (i.e., percent of variance, reduced chi-square, and F-ratio) were compared for their effectiveness in determining adequate model order. Limits of spatial resolution were established for a variety of multi-source configurations and noise conditions. Implications for the analysis of empirical data are discussed. C1 LOS ALAMOS NATL LAB,NEUROMAGNETISM LAB,BIOPHYS GRP,LOS ALAMOS,NM 87545. FU NEI NIH HHS [NEI EY08610] NR 28 TC 98 Z9 100 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9294 J9 IEEE T BIO-MED ENG JI IEEE Trans. Biomed. Eng. PD JUN PY 1993 VL 40 IS 6 BP 529 EP 540 DI 10.1109/10.237672 PG 12 WC Engineering, Biomedical SC Engineering GA LZ625 UT WOS:A1993LZ62500003 PM 8262534 ER PT J AU CHU, D REBER, CA PALMER, DW AF CHU, D REBER, CA PALMER, DW TI SCREENING ICS ON THE BARE CHIP LEVEL - TEMPORARY PACKAGING SO IEEE TRANSACTIONS ON COMPONENTS HYBRIDS AND MANUFACTURING TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP ON INTERNATIONAL ELECTRONICS MANUFACTURING TECHNOLOGY CY SEP 28-30, 1992 CL BALTIMORE, MD AB Several different temporary packaging concepts of integrated circuits (IC's) for pretest at speed and burn-in are introduced. Temporary packaging is achieved using standard labor and equipment resources already employed in permanent packaging. Experiments were carried out to validate the pretest process, and results are presented for the various materials used in the pretest process. The preferred method for temporary packaging along with the selected materials used is presented. Temporary packaging of integrated circuits for pretest with reasonable yield is demonstrated as feasible. RP CHU, D (reprint author), SANDIA NATL LABS,DEPT INTEGRATED CIRCUIT PACKAGING TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0148-6411 J9 IEEE T COMPON HYBR PD JUN PY 1993 VL 16 IS 4 BP 392 EP 395 DI 10.1109/33.237935 PG 4 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA MB274 UT WOS:A1993MB27400006 ER PT J AU ROBERTS, TM AF ROBERTS, TM TI THE NONLINEAR OPERATION OF A MICROWAVE CROSSED-FIELD AMPLIFIER - COMMENT SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Letter AB The title paper is significant because its claims of laboratory success have motivated further use of nonlinear Schrodinger equations to model amplifiers. Some of the paper's inaccurate equations are corrected here, and others identified. Questions are also raised about the claims of success in the laboratory. C1 US DOE,AMES LAB,AMES,IA 50011. NR 4 TC 0 Z9 0 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUN PY 1993 VL 40 IS 6 BP 1188 EP 1189 DI 10.1109/16.214755 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA LC005 UT WOS:A1993LC00500027 ER PT J AU GUNADHI, H SEGEV, A AF GUNADHI, H SEGEV, A TI EFFICIENT INDEXING METHODS FOR TEMPORAL RELATIONS SO IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING LA English DT Article DE INDEXING; PHYSICAL ORGANIZATION; QUERY PROCESSING; SEARCHING; TEMPORAL DATABASES AB The size of temporal databases and the semantics of temporal queries pose challenges for the design of efficient indexing methods. The primary issues that affect the design of indexing methods are examined, and propose several structures and algorithms for specific cases. Indexing methods for time-based queries are developed, queries on the surrogate or time-invariant key and time, and temporal attribute and time. In the latter case, several methods are presented that partition the time-line, in order to balance the distribution of tuple-pointers within the index. The methods are analyzed against alternatives, and present appropriate empirical results. C1 UNIV CALIF BERKELEY,WALTER A HAAS SCH BUSINESS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT COMP SCI RES & DEV,BERKELEY,CA 94720. NR 25 TC 14 Z9 15 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 1041-4347 J9 IEEE T KNOWL DATA EN JI IEEE Trans. Knowl. Data Eng. PD JUN PY 1993 VL 5 IS 3 BP 496 EP 509 DI 10.1109/69.224200 PG 14 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LM669 UT WOS:A1993LM66900010 ER PT J AU LLACER, J VEKLEROV, E COAKLEY, KJ HOFFMAN, EJ NUNEZ, J AF LLACER, J VEKLEROV, E COAKLEY, KJ HOFFMAN, EJ NUNEZ, J TI STATISTICAL-ANALYSIS OF MAXIMUM-LIKELIHOOD ESTIMATOR IMAGES OF HUMAN BRAIN FDG PET STUDIES SO IEEE TRANSACTIONS ON MEDICAL IMAGING LA English DT Article ID POSITRON-EMISSION TOMOGRAPHY; EM ALGORITHM; RECONSTRUCTION ALGORITHM; ACCIDENTAL COINCIDENCES; QUANTITATION; ATTENUATION; FEASIBILITY; NOISE AB The work presented in this paper evaluates the statistical characteristics of regional bias and expected error in reconstructions of real PET data of human brain fluorodeoxiglucose (FDG) studies carried out by the maximum likelihood estimator (MLE) method with a robust stopping rule, and compares them with the results of filtered backprojection (FBP) reconstructions and with the method of sieves. The task that we have investigated is that of quantifying radioisotope uptake in regions-of-interest (ROI's). We first describe a robust methodology for the use of the MLE method with clinical data which contains only one adjustable parameter: the kernel size for a Gaussian filtering operation that determines final resolution and expected regional error. Simulation results are used to establish the fundamental characteristics of the reconstructions obtained by our methodology, corresponding to the case in which the transition matrix is perfectly known. Then, data from 72 independent human brain FDG scans from four patients are used to show that the results obtained from real data are consistent with the simulation, although the quality of the data and of the transition matrix have an effect on the final outcome. The most important results are that, for equal resolution, expected pixel-by-pixel error in the MLE and sieves reconstructions are lower in the regions of low counts than in the regions of high counts, the lowest being for the MLE. In contrast, FBP reconstructions show an expected error that is high and nearly independent of the number of counts in a region. As a consequence, the determination of radioisotope uptake in ROI's of high activity has approximately the same standard deviation in MLE, sieves, and FBP reconstructions, while the standard deviation in ROI's of low uptake is substantially lower for MLE, while sieves take an intermediate value. The use of a well-constructed Monte Carlo transition matrix improves all the results with real data in a measurable way. We conclude that our proposed MLE methodology and the method of sieves have a definite advantage over FBP. There is a tradeoff between shorter computation time, a slight bias but lower standard deviation for MLE and longer computation time, a basically unbiased estimation but higher standard deviation for sieves. C1 NATL INST STAND & TECHNOL, DIV STAT ENGN, GAITHERSBURG, MD USA. UNIV CALIF LOS ANGELES, SCH MED, DEPT RADIOL SCI, LOS ANGELES, CA 90024 USA. UNIV BARCELONA, FAC FIS, BARCELONA 7, SPAIN. RP LLACER, J (reprint author), LAWRENCE BERKELEY LAB, DIV ENGN, BERKELEY, CA 94720 USA. NR 41 TC 49 Z9 49 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0278-0062 EI 1558-254X J9 IEEE T MED IMAGING JI IEEE Trans. Med. Imaging PD JUN PY 1993 VL 12 IS 2 BP 215 EP 231 DI 10.1109/42.232250 PG 17 WC Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Engineering, Electrical & Electronic; Imaging Science & Photographic Technology; Radiology, Nuclear Medicine & Medical Imaging SC Computer Science; Engineering; Imaging Science & Photographic Technology; Radiology, Nuclear Medicine & Medical Imaging GA LV990 UT WOS:A1993LV99000009 PM 18218409 ER PT J AU SUN, KQ AF SUN, KQ TI MSSW AND MSVW IN A MULTILAYERED FERRIMAGNETIC STRUCTURE WITH AN ARBITRARY ORIENTATION BETWEEN 2 STATIC MAGNETIZATIONS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID MAGNETOSTATIC SURFACE-WAVES; LAYERS; PROPAGATION AB This paper presents a study of both magnetostatic surface wave (MSSW) and magnetostatic volume wave (MSVW) propagation in multilayered magnetic thin films with noncollinear magnetizations. YIG/GGG/YIG structure is used, where YIG and GGG are the abbreviations for yttrium iron garnet and gadolinium gallium garnet, respectively. The layered film is in the (110) plane. Due to the existence of both cubic and induced in-plane uniaxial anisotropy fields in the two YIG films, the two magnetizations (M1 over arrow pointing right and M2 over arrow pointing right) are not aligned with the applied dc field. Since there is an arbitrary angle between M1 over arrow pointing right and M2 over arrow pointing right, there is a new configuration to study both MSSW and MSVW propagations. The interested MSVW propagation in the plane formed by M1 over arrow pointing right and M2 over arrow pointing right shows a different dispersion relationship from that in the direction perpendicular to the plane formed by M1 over arrow pointing right and M2 over arrow pointing right. For a given applied dc field normal to the film plane, MSVW is excited in the M2 over arrow pointing right layer, while MSSW is excited in the M1 over arrow pointing right layer. We have found that the angle between the two static magnetizations strongly affects the dispersion relationship. In addition, the effect of the separation between the two magnetic layers on the dispersion and time delay has been studied. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SUN, KQ (reprint author), JACKSON STATE UNIV,SCH SCI & TECHNOL,DEPT TECHNOL,JACKSON,MS 39217, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUN-JUL PY 1993 VL 41 IS 6-7 BP 1143 EP 1148 DI 10.1109/22.238539 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA MC680 UT WOS:A1993MC68000037 ER PT J AU CHESSER, JB AF CHESSER, JB TI RADIATION TESTING OF OPTICAL FIBERS FOR A HOT-CELL PHOTOMETER SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB In-line photometers are a possible method of monitoring separation processes in future nuclear fuel reprocessing facilities. Fiber optics will be used to trasmit light to the photometer cell and return the attenuated intensity to a photodetector, allowing removal of all the electronics from high radiation zones. In support of photometer development, commercially available fibers form three different manufacturers were tested in a Co-60 gamma field at a dose rate of 7.25 X 10(4) rad/h. The fibers tested were large diameter (1000 mum), silica core fibers. Two fibers had doped silica cladding; one fiber has a polymer cladding. Of the fiber specimens tested the silica-clad fibers had lower attenuations for a given dose than did the polymer-clad fiber. At 8 X 10(7) rad total accumulated dose, the fiber with the lowest radiation-induced loss had attenuations of 1.3 dB/m at a wavelength of 405 nm, 1.6 dB/m at 632 nm, and 0.3 dB/m at 905 nm. RP CHESSER, JB (reprint author), OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,POB 2008,OAK RIDGE,TN 37831, USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD JUN PY 1993 VL 40 IS 3 BP 307 EP 309 DI 10.1109/23.221056 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA LL506 UT WOS:A1993LL50600010 ER PT J AU ANDERS, A ANDERS, S JUTTNER, B BROWN, IG AF ANDERS, A ANDERS, S JUTTNER, B BROWN, IG TI TIME-DEPENDENCE OF VACUUM-ARC PARAMETERS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID CHARGE-STATE DISTRIBUTIONS; CATHODE TEMPERATURE; ION-SOURCE; DENSITIES; CRATERS; PLASMA AB Time-resolved investigations of the expanded plasma of vacuum arc cathode spots are described, including the study of the ion charge state distribution, the random cathode spot motion, and the crater formation. It was found that the ion charge state distribution changes over a timescale on the order of hundreds of microseconds. For the random spot motion two timescales were observed: a very short spot residence time of tens of nanoseconds which gives, combined with the step width, the diffusion parameter of the random motion, and a longer timescale on the order of 100 mus during which the diffusion parameter changes. Crater formation studies by scanning electron microscopy indicate the occurrence of larger craters at the end of crater chains. The existence of a timescale, much longer than the elementary times for crater formation and spot residence, can be explained by local heat accumulation. C1 MAX PLANCK INST PLASMA PHYS, BEREICH BERLIN, W-0017 BERLIN, GERMANY. RP ANDERS, A (reprint author), LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RI Anders, Andre/B-8580-2009; Raoux, Simone/G-3920-2016 OI Anders, Andre/0000-0002-5313-6505; NR 28 TC 45 Z9 46 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0093-3813 EI 1939-9375 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1993 VL 21 IS 3 BP 305 EP 311 DI 10.1109/27.277556 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LR127 UT WOS:A1993LR12700006 ER PT J AU MEYER, JF PHAM, H AF MEYER, JF PHAM, H TI FAULT-TOLERANT SOFTWARE - PROLOG SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Editorial Material C1 IDAHO NATL ENGN LAB,RISK ASSESSMENT & APPL MATH GRP,IDAHO FALLS,ID 83415. RP MEYER, JF (reprint author), UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,ANN ARBOR,MI 48109, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD JUN PY 1993 VL 42 IS 2 BP 177 EP 178 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LR609 UT WOS:A1993LR60900001 ER PT J AU Theiler, J Lookman, T AF Theiler, James Lookman, Turab TI STATISTICAL ERROR IN A CHORD ESTIMATOR OF CORRELATION DIMENSION: THE "RULE OF FIVE" SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article AB The statistical precision of a chord method for estimating dimension from a correlation integral is derived. The optimal chord length is determined, and a comparison is made with other estimators. The simple chord estimator is only 25% less precise than the optimal estimator which uses the full resolution and full range of the correlation integral. The analytic calculations are based on the hypothesis that all pairwise distances between the points in the embedding space are statistically independent. The adequacy of this approximation is assessed numerically, and a surprising result is observed in which dimension estimators can be anomalously precise for sets with reasonably uniform (nonfractal) distributions. C1 [Theiler, James] Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. [Theiler, James] Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. [Lookman, Turab] Univ Western Ontario, Dept Appl Math, London, ON N6A 5B7, Canada. RP Theiler, J (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. FU National Institute of Mental Health [1-R01-MH47184-01]; Department of Energy FX We are grateful to the Advanced Computing Laboratory at the Los Alamos National Laboratory for the computer resources used to perform the numerical experiments shown here. Work by JT was partially supported by a grant from the National Institute of Mental Health 1-R01-MH47184-01 and was performed at Los Alamos under the auspices of the Department of Energy. NR 28 TC 29 Z9 29 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1274 EI 1793-6551 J9 INT J BIFURCAT CHAOS JI Int. J. Bifurcation Chaos PD JUN PY 1993 VL 3 IS 3 BP 765 EP 771 DI 10.1142/S0218127493000672 PG 7 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V44LR UT WOS:000209751000029 ER PT J AU Tufillaro, NB AF Tufillaro, Nicholas B. TI DISCRETE DYNAMICAL MODELS SHOWING PATTERN FORMATION IN SUBAQUEOUS BEDFORMS SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article AB A new class of "toy models" for subaqueous bedform formation are proposed and examined. These models all show a similar mechanism of wavelength selection via bedform unification, and they may have applications to bedform stratigraphy. The models are also useful for exploring general issues of pattern formation and complexity in stochastically driven far-from-equilibrium systems. C1 [Tufillaro, Nicholas B.] Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, MS B258, Los Alamos, NM 87545 USA. RP Tufillaro, NB (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, MS B258, Los Alamos, NM 87545 USA. NR 11 TC 6 Z9 6 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1274 EI 1793-6551 J9 INT J BIFURCAT CHAOS JI Int. J. Bifurcation Chaos PD JUN PY 1993 VL 3 IS 3 BP 779 EP 784 DI 10.1142/S0218127493000696 PG 6 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V44LR UT WOS:000209751000031 ER PT J AU Mansour, Y Park, JK Schieber, B Sen, S AF Mansour, Yishay Park, James K. Schieber, Baruch Sen, Sandeep TI IMPROVED SELECTION IN TOTALLY MONOTONE ARRAYS SO INTERNATIONAL JOURNAL OF COMPUTATIONAL GEOMETRY & APPLICATIONS LA English DT Article DE Planar distance selection; convex polygons; totally monotone arrays; Monge arrays AB This paper's main result is an O(n root m lg n + m)-time algorithm for computing the kth smallest entry in each row of an m x n totally monotone array. (A two-dimensional array A = {a[i,j]} is totally monotone if for all i(1) < i(2) and at j(1) < j(2), a[i(1), j(1) ] < a[i(1), j(2)] implies a[i(2), j(1)] < a[i(2), j(2)].) For large values of k (in particular, for k = inverted right perpendicularn/2inverted lelft perpendicular), this algorithm is significantly faster than the O(k(m+n))-time algorithm for the same problem due to Kravets and Park. An immediate consequence of this result is an 0(n(3/2) lg(1/2) n)time algorithm for computing the kth nearest neighbor of each vertex of a convex n-gon. In addition to the main result, we also give an 0(n lg m)-time algorithm for computing an approximate median in each row of an m x n totally monotone array; this approximate median is an entry whose rank in its row lies between left perpendicularn/4right perpendicular and inverted right perpendicular3n/4inverted left perpendicular - 1. C1 [Mansour, Yishay; Schieber, Baruch] IBM Corp, Div Res, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA. [Park, James K.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Sen, Sandeep] Indian Inst Technol, Dept Comp Sci & Engn, New Delhi 110016, India. RP Mansour, Y (reprint author), IBM Corp, Div Res, TJ Watson Res Ctr, POB 704, Yorktown Hts, NY 10598 USA. FU Defense Advanced Research Projects Agency [N00014-87-K-0825]; Office of Naval Research [N00014-86-K-0593]; Department of Energy [DE-AC04-76DP00789] FX The majority of the work described in the paper was performed while the first and fourth authors were visiting IBM's T. J. Watson Research Center during the summer of 1989 and while the second author was a member of MIT's Laboratory for Computer Science. The second author's work at MIT was supported in part by the Defense Advanced Research Projects Agency under Contract N00014-87-K-0825 and the Office of Naval Research under Contract N00014-86-K-0593, and his work at Sandia National Laboratories was supported by the Department of Energy under Contract DE-AC04-76DP00789. NR 30 TC 3 Z9 3 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1959 EI 1793-6357 J9 INT J COMPUT GEOM AP JI Int. J. Comput. Geom. Appl. PD JUN PY 1993 VL 3 IS 2 BP 115 EP 132 DI 10.1142/S0218195993000087 PG 18 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA V30CZ UT WOS:000208795400001 ER PT J AU WELLS, JC UMAR, AS OBERACKER, VE BOTTCHER, C STRAYER, MR WU, JS DRAKE, J FLANERY, R AF WELLS, JC UMAR, AS OBERACKER, VE BOTTCHER, C STRAYER, MR WU, JS DRAKE, J FLANERY, R TI A NUMERICAL IMPLEMENTATION OF THE DIRAC-EQUATION ON A HYPERCUBE MULTICOMPUTER SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C-PHYSICS AND COMPUTERS LA English DT Article DE DIRAC EQUATION; BASIS-SPLINE COLLOCATION METHOD; MASSIVELY PARALLEL COMPUTING ID HEAVY-ION COLLISIONS; DEPENDENT HARTREE-FOCK; LATTICE FERMIONS; PAIR PRODUCTION; TIME; ALGORITHMS; FIELDS; MATRIX AB We describe the numerical methods used to solve the time-dependent Dirac equation on a three-dimensional Cartesian lattice. Efficient algorithms are required for computationally intensive studies of nonperturbative electromagnetic lepton-pair production in relativistic heavy-ion collisions. Discretization is achieved through the lattice basis-spline collocation method, in which quantum-state vectors and coordinate-space operators are expressed in terms of basis-spline functions on a spatial lattice. For relativistic lepton fields on a lattice, the fermion-doubling problem is central in the formulation of the numerical method. All numerical procedures reduce to a series of matrix-vector operations which we perform on the Intel iPSC/860 hypercube, making full use of parallelism. We discuss solutions to the problems of limited node memory and node-to-node communication overhead inherent in using distributed-memory, multiple-instruction, multiple-data stream parallel computers. C1 OAK RIDGE NATL LAB,CTR COMPUTAT INTENS PHYS,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. RI Umar, Ahmet/J-4125-2013; Wells, Jack/D-3675-2016 OI Umar, Ahmet/0000-0002-9267-5253; Wells, Jack/0000-0002-5083-3030 NR 34 TC 20 Z9 20 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0129-1831 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C-Phys. Comput. PD JUN PY 1993 VL 4 IS 3 BP 459 EP 492 DI 10.1142/S0129183193000501 PG 34 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA LU431 UT WOS:A1993LU43100001 ER PT J AU LILJEGREN, LM AF LILJEGREN, LM TI THE EFFECT OF A MEAN FLUID VELOCITY-GRADIENT ON THE STREAMWISE VELOCITY VARIANCE OF A PARTICLE SUSPENDED IN A TURBULENT-FLOW SO INTERNATIONAL JOURNAL OF MULTIPHASE FLOW LA English DT Article DE PARTICULATE MOTION; TURBULENCE; PARTICLE VELOCITY VARIANCE; 2-PHASE FLOW ID DISPERSION; MODEL; PIPE; AIR AB The effect of a mean fluid velocity gradient on the motion of a small solid particle suspended in a turbulent gas is analyzed using Fourier transform techniques. The presence of a mean fluid velocity gradient is shown to elevate the streamwise particle velocity variance above the level predicted without such gradients; the particle velocity variance in the direction normal to the flow is shown to be only indirectly affected by the existence of fluid velocity gradients. When the particle Stokes number is small, the streamwise particle velocity variance is elevated above the level predicted in flows without mean velocity gradients at a rate which is linearly proportional to both the particle Stokes number, alpha, and the ratio of the streamwise velocity gradient to the characteristic frequency of the energy-containing eddies in the turbulent field, G/omega(e). For particles with large Stokes numbers, the dominant mechanism by which particle streamwise velocity fluctuations are generated is through random interaction between the particle path and the mean fluid velocity gradient. RP LILJEGREN, LM (reprint author), PACIFIC NW LAB, DEPT ANALYT SCI, RICHLAND, WA 99352 USA. NR 25 TC 29 Z9 31 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0301-9322 J9 INT J MULTIPHAS FLOW JI Int. J. Multiph. Flow PD JUN PY 1993 VL 19 IS 3 BP 471 EP 484 DI 10.1016/0301-9322(93)90061-X PG 14 WC Mechanics SC Mechanics GA LJ487 UT WOS:A1993LJ48700005 ER PT J AU MIASKIEWICZ, K MILLER, J OSMAN, R AF MIASKIEWICZ, K MILLER, J OSMAN, R TI ABINITIO THEORETICAL-STUDY OF THE STRUCTURES OF THYMINE GLYCOL AND DIHYDROTHYMINE SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID DNA-BASE DAMAGE; ESCHERICHIA-COLI DNA; THYMIDINE GLYCOL; OXIDATIVE DAMAGE; POLYMERASE-I; IONIZING-RADIATION; LESIONS; INVITRO AB The structures of all diastereoisomers of 5,6-dihydroxy-5,6-dihydrothymine (thymine glycol) and 5,6-dihydrothymine, two important DNA lesions, have been optimized with ab initio quantum chemical methods at a 6-31G level of calculations. The methyl group on C5 of thymine glycol shows a strong preference for a pseudo axial orientation. In contrast, in 5,6-dihydrothymine a pseudo equatorial methyl is preferred. Consequently, the thymine glycol lesion is much more bulky than 5,6-dihydrothymine. This observation may explain the different biological consequences observed for the two lesions. C1 PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. CUNY MT SINAI SCH MED, DEPT PHYSIOL & BIOPHYS, NEW YORK, NY 10029 USA. NR 31 TC 32 Z9 32 U1 0 U2 1 PU INFORMA HEALTHCARE PI LONDON PA TELEPHONE HOUSE, 69-77 PAUL STREET, LONDON EC2A 4LQ, ENGLAND SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD JUN PY 1993 VL 63 IS 6 BP 677 EP 686 DI 10.1080/09553009314552071 PG 10 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 LJ482 UT WOS:A1993LJ48200002 PM 8100254 ER PT J AU MOORE, RC BENDER, MA AF MOORE, RC BENDER, MA TI CHROMOSOMAL ABERRATION TYPES IN CELLS AT THE 2ND DIVISION AFTER IRRADIATION IN G(1) OR G(2) SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID RADIATION; FUSION; CYCLE AB Cultures of JU-56 cells were irradiated in either G1 or G2 and examined either in their first post-irradiation metaphase (in diploids) or in their second post-irradiation metaphase (in colcemid-induced tetraploids). The timing of fixation, together with tritiated thymidine pulse labelling, allowed selection for scoring only metaphases of cells that were in the G1 or G2 phase of the cell cycle during irradiation. With G1 irradiation it was found that many of the aberrations observed at the first division were not present (as derivatives) at the second division, and also that new aberrations were found at the second division, which were not derived from aberrations at the first division. Clonogenic survival was also measured in populations of cells irradiated in G1. It was found that cells containing chromosomal aberrations at the first division were not numerous enough to explain lack of survival. When frequencies of aberrations following G2 irradiation scored at the second division were compared with those scored at the first, there was a significant increase in dicentrics as compared with their progenitor asymmetrical chromatid interchanges, and of mirror-image dicentrics as compared with their progenitor sister unions. A substantial number of sister unions were also observed at the second division. We conclude that some aberrations arc lost during the interphase between the first and the second post-irradiation metaphase and that new chromosomal aberrations arise during the second post-irradiation interphase. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. PETER MACCALLUM CANC INST,RES DIV LAB,CELL BIOL UNIT,MELBOURNE 3000,AUSTRALIA. NR 24 TC 8 Z9 8 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD JUN PY 1993 VL 63 IS 6 BP 731 EP 741 DI 10.1080/09553009314552131 PG 11 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 LJ482 UT WOS:A1993LJ48200008 PM 8100260 ER PT J AU VOLF, V BURGADA, R RAYMOND, KN DURBIN, PW AF VOLF, V BURGADA, R RAYMOND, KN DURBIN, PW TI EARLY CHELATION-THERAPY FOR INJECTED PU-238 AND AM-241 IN THE RAT - COMPARISON OF 3,4,3-LIHOPO, DFO-HOPO, DTPA-DX, DTPA AND DFOA SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID SEQUESTERING AGENTS; ACTINIDES; MICE; LICAM(C); REMOVAL; LIGANDS AB Chelating agents were tested for removal of simultaneously injected Pu-238 and Am-241 from the rat. The effectiveness of early single chelate injections on Pu-238 retention in tissues decreased in the order 3,4,3-LIHOPO > DFO-HOPO > DTPA > DTPA-DX, and for Am-241 in the order 3,4,3-LIHOPO > DTPA-DX > DTPA much greater than DFO-HOPO. DTPA-DX showed a special ability to remove Am-241 from the liver. Injected 3,4,3-LIHOPO decreased the contents of Pu-238 in bone and liver to 9 and 3%, respectively, of those in untreated controls. Corresponding values for Am-241 in bone and liver were 30 and 6%, respectively, which indicates that 3,4,3-LIHOPO (unlike DFO-HOPO) is not a plutonium-specific chelator. The effectiveness of prompt single oral treatment with 3,4,3-LIHOPO and DFO-HOPO in reducing retention of actinides was comparable with that of these chelators injected with 1 h delay and at one-third of the oral dose. When 3,4,3-LIHOPO was administered by continuous infusion, a superior effect was achieved with total chelate amounts only slightly exceeding that given as single injection. The retention of PU-238 and Am-241 in bones was reduced to < 5 and 10% of controls, respectively; the contents in the liver were < 2% of controls. C1 UNIV PARIS 06,CHIM ORGANOELEMENTS LAB,F-75252 PARIS,FRANCE. UNIV CALIF BERKELEY,DEPT MED,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP VOLF, V (reprint author), KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST TOXIKOL,POSTFACH 3640,W-7500 KARLSRUHE 1,GERMANY. NR 17 TC 22 Z9 22 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD JUN PY 1993 VL 63 IS 6 BP 785 EP 793 DI 10.1080/09553009314552191 PG 9 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 LJ482 UT WOS:A1993LJ48200014 PM 8100266 ER PT J AU REW, J ASTON, DC GORDON, KW WHEELER, K AF REW, J ASTON, DC GORDON, KW WHEELER, K TI THE 0TH HETEROGENEOUS COMPUTING CHALLENGE - FUN AND (SOMETIMES TOO MUCH) EXCITEMENT SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article C1 MINNESOTA SUPERCOMP CTR INC,MINNEAPOLIS,MN. SANDIA NATL LABS,LIVERMORE,CA 94550. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP REW, J (reprint author), NATL CTR ATMOSPHER RES,BOULDER,CO 80307, USA. NR 0 TC 2 Z9 2 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 SUM PY 1993 VL 7 IS 2 BP 91 EP 96 PG 6 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA LX232 UT WOS:A1993LX23200001 ER PT J AU MASTIN, GA PLIMPTON, SJ GHIGLIA, DC AF MASTIN, GA PLIMPTON, SJ GHIGLIA, DC TI A MASSIVELY-PARALLEL DIGITAL PROCESSOR FOR SPOTLIGHT SYNTHETIC-APERTURE RADAR SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article ID PHASE AB Near-real-time digital formation of large synthetic aperture radar (SAR) images requires the computational throughput that only a dedicated special processor or a massively parallel computer can offer. This article documents the implementation of digital spotlight SAR processing components on three commercially available massively parallel computers: the Connection Machine (CM-2), the nCUBE 2, and the Intel iPSC/860. The three basic spotlight SAR processing components, the polar reformatter, the two-dimensional fast Fourier transformation, and autofocus, are briefly discussed to provide a technical background for the implementation issues that apply to massively parallel computers. Aspects of the SAR components that can exploit features of a SIMD or MIMD architecture are also presented. Finally, timing test results on various computers are provided foe evaluation and comparison. RP MASTIN, GA (reprint author), SANDIA NATL LABS,ORG 9134,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 6 Z9 6 U1 1 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1993 VL 7 IS 2 BP 97 EP 112 DI 10.1177/109434209300700202 PG 16 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA LX232 UT WOS:A1993LX23200002 ER PT J AU EDELMAN, A AF EDELMAN, A TI LARGE DENSE NUMERICAL LINEAR ALGEBRA IN 1993 - THE PARALLEL COMPUTING INFLUENCE SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article AB This article surveys the current state of applications of large dense numerical linear algebra and the influence of parallel computing. Furthermore, it attempts to crystallize many important ideas that are sometimes misunderstood in the rush to write fast programs. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP EDELMAN, A (reprint author), UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720, USA. NR 35 TC 23 Z9 23 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 SUM PY 1993 VL 7 IS 2 BP 113 EP 128 DI 10.1177/109434209300700203 PG 16 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA LX232 UT WOS:A1993LX23200003 ER PT J AU JONES, MT PLASSMANN, PE AF JONES, MT PLASSMANN, PE TI COMPUTATION OF EQUILIBRIUM VORTEX STRUCTURES FOR TYPE-II SUPERCONDUCTORS SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article ID GINZBURG-LANDAU EQUATIONS; YBA2CU3O7; MATRICES; SYSTEM AB A model of the vortex structure and configuration for homogeneous type-II superconductors can be determined by minimization of the Ginzburg-Landau free energy functional. A generalization of this formulation, the Lawrence-Doniach model, can be used for layered systems. A finite-dimensional approximation of this functional leads to a very large, sparse optimization problem. A number of algorithms have been used to attempt to solve this problem. The most successful of these is a damped, inexact Newton algorithm. Its computational kernel is the iterative solution of a large, sparse, linear system that is nearly singular. We present computational results for solving these three-dimensional problems on the Intel DELTA. Using a general-purpose, scalable, iterative solver based on the preconditioned conjugate gradient method, we obtained sustained computational rates of up to 4.26 GFLOPS on 512 processors. We find improvements of over a factor of 100 in the total execution time when compared with the same problem run on the CRAY-2. This computational tool has given us the first computational view of three-dimensional vortex phenomena such as vortex locking. RP JONES, MT (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 23 TC 3 Z9 3 U1 1 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1993 VL 7 IS 2 BP 129 EP 143 DI 10.1177/109434209300700204 PG 15 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA LX232 UT WOS:A1993LX23200004 ER PT J AU CONRY, MJ BURKE, JI AF CONRY, MJ BURKE, JI TI A NOTE ON A GRAIN-YIELD COMPARISON OF SPRING-SOWN WINTER AND SPRING BARLEY SO IRISH JOURNAL OF AGRICULTURAL AND FOOD RESEARCH LA English DT Article DE BARLEY; CULTIVARS; SOWING DATES AB Yields of winter and spring barley, sown on five dates in spring on two different soil types were compared over a four-year period (1985-1988). There were no differences in the mean yields of winter and spring barley sown in the earlier part of February. When sowing was delayed until the end of February or later, spring barley gave significantly (P < 0.05) greater mean yields than the winter barley at both sites. RP CONRY, MJ (reprint author), TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. NR 0 TC 0 Z9 0 U1 1 U2 1 PU TEAGASC PI DUBLIN PA 19 SANDYMOUNT AVE, DUBLIN 4, IRELAND SN 0791-6833 J9 IRISH J AGR FOOD RES JI Irish J. Agr. Food Res. PD JUN PY 1993 VL 32 IS 1 BP 87 EP 90 PG 4 WC Agriculture, Multidisciplinary; Food Science & Technology SC Agriculture; Food Science & Technology GA LM837 UT WOS:A1993LM83700010 ER PT J AU CONRY, MJ AF CONRY, MJ TI A NOTE ON NITROGEN RATE FOR WINTER BARLEY GROWN ON A LIGHT SOIL SO IRISH JOURNAL OF AGRICULTURAL AND FOOD RESEARCH LA English DT Article DE NITROGEN; SOILS; WINTER BARLEY AB An experiment was replicated over time (5 years, 1987 to 1991) to determine the optimum rate of nitrogen for winter barley grown on a light-textured soil. The nitrogcn levels used were 80, 120, 160 and 200 kg/ha. There was no significant increase in grain yield when more than 120 kg/ha was applied in 1987, 1989 and 1990, but in the other two years (1988 and 1991) the application of 160 kg N/ha gave a significant increase in yield. The higher rate of nitrogen (200 kg/ha) did not increase grain yield. RP CONRY, MJ (reprint author), TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TEAGASC PI DUBLIN PA 19 SANDYMOUNT AVE, DUBLIN 4, IRELAND SN 0791-6833 J9 IRISH J AGR FOOD RES JI Irish J. Agr. Food Res. PD JUN PY 1993 VL 32 IS 1 BP 91 EP 92 PG 2 WC Agriculture, Multidisciplinary; Food Science & Technology SC Agriculture; Food Science & Technology GA LM837 UT WOS:A1993LM83700011 ER PT J AU STEVENS, JE CECCHI, JL AF STEVENS, JE CECCHI, JL TI WAVE-PROPAGATION AND PLASMA UNIFORMITY IN AN ELECTRON-CYCLOTRON-RESONANCE PLASMA ETCH REACTOR SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS LA English DT Article DE PLASMA ETCHING; ELECTRON CYCLOTRON RESONANCE; WAVE PROPAGATION; UNIFORMITY AB Wave propagation and absorption have been studied experimentally in an electron cyclotron resonance (ECR) plasma etch reactor operating at 2.45 GHz, with various microwave couplers. A coaxial rf probe was used to measure the wave amplitude along the reactor axis, and radial profiles of the plasma ion saturation current were determined by a Langmuir probe. A single mode whistler wave was detected, and wave absorption was found to occur at magnetic fields corresponding to an ECR frequency which is Doppler-shifted above the cold resonance. The radial uniformity of the plasma is strongly determined by the radial power distribution of the microwave coupler at lower magnetic fields where absorption occurs near the microwave window. Plasma radial transport also influences the resulting profile, especially for modes which are hollow in the center, such as the TM01. Under conditions where the waves propagate from the window without absorption for several wavelengths, the waves refract towards regions of lower density where subsequent ionization tends to correct non-uniform plasma profiles. A model is presented and yields predictions which are in good agreement with the data. The model allows calculation of wave trajectories by ray-tracing techniques and includes simple plasma transport and power deposition. RP PRINCETON UNIV, DEPT CHEM ENGN, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08544 USA. NR 13 TC 25 Z9 25 U1 0 U2 0 PU JAPAN SOC APPLIED PHYSICS PI TOKYO PA KUDAN-KITA BUILDING 5TH FLOOR, 1-12-3 KUDAN-KITA, CHIYODA-KU, TOKYO, 102-0073, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Brief Commun. Rev. Pap. PD JUN PY 1993 VL 32 IS 6B BP 3007 EP 3012 DI 10.1143/JJAP.32.3007 PG 6 WC Physics, Applied SC Physics GA LL787 UT WOS:A1993LL78700023 ER PT J AU KUMAR, KS LIU, CT AF KUMAR, KS LIU, CT TI ORDERED INTERMETALLIC ALLOYS .2. SILICIDES, TRIALUMINIDES, AND OTHERS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Review ID HIGH-TEMPERATURE APPLICATIONS; MECHANICAL-PROPERTIES; SINGLE-CRYSTALS; STRUCTURAL APPLICATIONS; TITANIUM TRIALUMINIDE; PLASTIC-DEFORMATION; PHASE-EQUILIBRIA; L12; AL; DEPENDENCE AB This article summarizes recent progress in research and development on silicides, trialuminides, other aluminides, beryllides, and chromides. While the nickel, iron, and titanium aluminides have been the focus of much of the research in recent years, the understanding gained from such work has been extended to other intermetallic systems, as is described here. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN. RP KUMAR, KS (reprint author), MARTIN MARIETTA CORP LABS,BALTIMORE,MD 21227, USA. NR 96 TC 43 Z9 45 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUN PY 1993 VL 45 IS 6 BP 28 EP 34 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA LE877 UT WOS:A1993LE87700006 ER PT J AU OLSEN, CS AF OLSEN, CS TI PERSPECTIVES ON THE EVOLUTION OF REFRACTORY-METALS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Editorial Material RP OLSEN, CS (reprint author), EG&G IDAHO INC,IDAHO FALLS,ID 83401, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUN PY 1993 VL 45 IS 6 BP 49 EP 49 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA LE877 UT WOS:A1993LE87700011 ER PT J AU LAYNE, SP DEMBO, M SPOUGE, JL GELDERBLOM, HR RENZ, H MERGES, MJ NARA, PL AF LAYNE, SP DEMBO, M SPOUGE, JL GELDERBLOM, HR RENZ, H MERGES, MJ NARA, PL TI FACTORS REGULATING THE SPONTANEOUS INACTIVATION OF HIV AND ITS SUSCEPTIBILITY TO NEUTRALIZATION SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES, SCH MED, DEPT MED, LOS ANGELES, CA USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. NATL LIB MED, BETHESDA, MD 20209 USA. ROBERT KOCH INST, W-1000 BERLIN 65, GERMANY. NCI, FREDERICK, MD 21701 USA. RI Dembo, Micah/C-2755-2013 NR 0 TC 0 Z9 0 U1 0 U2 2 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 1525-4135 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. PD JUN PY 1993 VL 6 IS 6 BP 704 EP 704 PG 1 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA LC751 UT WOS:A1993LC75100164 ER PT J AU SPOUGE, JL LAYNE, SP DEMBO, M NARA, PL AF SPOUGE, JL LAYNE, SP DEMBO, M NARA, PL TI SINGLE-HIT ANTIBODY KINETICS - THE RESOLUTION OF A PARADOX AND ITS IMPLICATIONS FOR VACCINE DEVELOPMENT SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES LA English DT Meeting Abstract C1 NLM, NATL CTR BIOTECHNOL INFORMAT, BETHESDA, MD 20894 USA. UNIV CALIF LOS ANGELES, SCH MED, DEPT MED, LOS ANGELES, CA 90024 USA. LANL, BIOPHYS GRP, LOS ALAMOS, NM 87545 USA. NCI, FCRF, LTCB, VIRUS BIOL SECT, FREDERICK, MD 21702 USA. RI Dembo, Micah/C-2755-2013 NR 0 TC 0 Z9 0 U1 0 U2 2 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 1525-4135 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. PD JUN PY 1993 VL 6 IS 6 BP 710 EP 710 PG 1 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA LC751 UT WOS:A1993LC75100189 ER PT J AU MCCUTCHAN, F LOUWAGIE, J EDDY, G VANDERGROEN, G PIOT, P MYERS, G BURKE, D AF MCCUTCHAN, F LOUWAGIE, J EDDY, G VANDERGROEN, G PIOT, P MYERS, G BURKE, D TI IDENTIFICATION OF MULTIPLE GENETIC SUBTYPES OF HIV-1 AND EVIDENCE FOR GEOGRAPHIC DISPERSAL SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES AND HUMAN RETROVIROLOGY LA English DT Meeting Abstract C1 HENRY M JACKSON FDN,ROCKVILLE,MD. PRINCE LEOPOLD INC TROP MED,ANTWERP,BELGIUM. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. WALTER REED ARMY INST RES,WASHINGTON,DC 20307. NR 0 TC 1 Z9 1 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 1077-9450 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. Hum. Retrovirol. PD JUN PY 1993 VL 6 IS 6 BP 685 EP 685 PG 1 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA LC751 UT WOS:A1993LC75100087 ER PT J AU BRITT, PF BUCHANAN, AC MALCOLM, EA BIGGS, CA AF BRITT, PF BUCHANAN, AC MALCOLM, EA BIGGS, CA TI EFFECT OF CROSS-LINKING ON THE PYROLYSIS OF DIPHENYLALKANES SO JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON FUNDAMENTAL ASPECTS, PROCESSES AND APPLICATIONS OF PYROLYSIS CY SEP 28-OCT 02, 1992 CL HAMBURG, GERMANY DE CROSS-LINKING; DIPHENYLALKANES; HETEROGENEOUS ENVIRONMENT; HYDROGEN DONOR SOLVENTS; PYROLYSIS ID RADICAL CHAIN DECOMPOSITION; COAL-LIQUEFACTION MODEL; DIBENZYL ETHER; PHENYL ETHER; THERMOLYSIS; 1,3-DIPHENYLPROPANE; SURFACE; 1,4-DIPHENYLBUTANE AB In the early stages of the thermal depolymerization of biopolymers, geopolymers, and synthetic polymers, their cross-linked macromolecular structure may restrict the diffusion of reactive intermediates and alter reaction pathways. In an effort to model the effects of restricted mass transport on the thermally induced free radical decomposition of polymethylene units bridging aromatic clusters in coal, 1,3-diphenylpropane (DPP) and 1,4-diphenylbutane (DPB) have been cross-linked to an inert silica surface by the condensation of the corresponding diphenol, p-HOC6H4(CH2)nC6H4OH-p. Pyrolysis of a cross-linked DPP at 375-degrees-C yielded a 100-fold increase in secondary products as a consequence of cross-linking. Pyrolysis of a cross-linked DPB at 400-degrees-C afforded an altered product selectivity favoring products from the thermodynamically less stable aliphatic radical. The surface-attached compounds were also used as solid state probes to study the reactions of hydrogen donor solvents in a heterogeneous environment. RP BRITT, PF (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 23 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2370 J9 J ANAL APPL PYROL JI J. Anal. Appl. Pyrolysis PD JUN PY 1993 VL 25 BP 407 EP 417 DI 10.1016/0165-2370(93)80059-9 PG 11 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA LL083 UT WOS:A1993LL08300034 ER PT J AU JOHNSON, SW NICOL, M SCHIFERL, D AF JOHNSON, SW NICOL, M SCHIFERL, D TI ALGORITHM FOR SORTING DIFFRACTION DATA FROM A SAMPLE CONSISTING OF SEVERAL CRYSTALS ENCLOSED IN A SAMPLE ENVIRONMENT APPARATUS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article AB A sample environment apparatus, such as a diamond-anvil cell (DAC), cryostat or furnace, presents a unique problem for the crystallographer because some of the diffraction data are shadowed by its components. The first algorithm for sorting diffraction data from a sample consisting of several crystals enclosed in a sample environment apparatus is described. This algorithm requires no previous knowledge of the crystal structure of the sample, so it can be used to solve the structures of substances when the growth of one unstrained crystal is unsuccessful. An example is given to illustrate the development and the implementation of this algorithm: the identification of the unit cell of a high-pressure phase of oxygen known as epsilon-oxygen (epsilon-O2). The epsilon-O2 sample contains at least seven individual crystals and is enclosed in a DAC. The epsilon-O2 unit cell is monoclinic, it contains eight molecules per unit cell and the lattice constants at 19.7 GPa and room temperature are a = 3.642, b = 5.491, c = 7.705 angstrom and beta = 116.2-degrees. In the example, monochromatic X-ray diffraction data from this high-pressure sample are sorted, but the algorithm is a general-purpose technique; it can also be used to sort single-crystal time-of-flight neutron diffraction data. Additionally, this method may be used to sort reflections from several crystal samples containing a mixture of materials. The algorithm is given in symbolic logic so that it can be translated and inserted into available crystallographic software packages. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. NR 3 TC 33 Z9 33 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD JUN 1 PY 1993 VL 26 BP 320 EP 326 DI 10.1107/S0021889892008422 PN 3 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LL528 UT WOS:A1993LL52800002 ER PT J AU MILDNER, DFR ARIF, M STONE, CA CRAWFORD, RK AF MILDNER, DFR ARIF, M STONE, CA CRAWFORD, RK TI THE NEUTRON TRANSMISSION OF SINGLE-CRYSTAL SAPPHIRE FILTERS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article AB The wavelength dependence of the transmission probability of a beam of neutrons through super optical quality single-crystal sapphire at room temperature has been measured. The measurements extend over the neutron wavelength range 0.05-1.2 nm. Sharp dips in the transmission caused by Bragg reflection are not found. The data below the dip around 0.2 nm in the cross section have been fitted to a function that accounts for multiphonon scattering. Measurements performed on single crystals with increased lattice distortion (or mosaic spread) show an increase in the cross section at long wavelengths. The attenuation of room-temperature Al2O3 is not significantly different from that for liquid-nitrogen-cooled MgO. C1 ARGONNE NATL LAB,INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439. RP MILDNER, DFR (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 14 TC 15 Z9 14 U1 0 U2 5 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD JUN 1 PY 1993 VL 26 BP 438 EP 447 DI 10.1107/S0021889893000433 PN 3 PG 10 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LL528 UT WOS:A1993LL52800018 ER PT J AU ALLWINE, KJ AF ALLWINE, KJ TI ATMOSPHERIC DISPERSION AND TRACER VENTILATION IN A DEEP MOUNTAIN VALLEY SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID NOCTURNAL DRAINAGE FLOW; BRUSH CREEK VALLEY; PLUME DISPERSION; AMS WORKSHOP; TRANSPORT; WINDS; COLORADO; STABILITY; TRIBUTARY; SCHEMES AB During September and October 1984, a major meteorological and tracer study was conducted in Colorado's Brush Creek valley. The characteristics of atmospheric dispersion during the nighttime and morning transition periods are discussed in this paper. Tracer released near the valley floor did not reach the ridgetops (escape from the valley) during the nighttime but was confined to the valley, being carried in down-valley flows. After sunrise, with the onset of convective boundary-layer growth and initiation of upslope flows, the tracer within the valley was carried into the upper elevations of the valley atmosphere and ventilated from the valley. This was confirmed by the ridgetop tracer samplers and by a tracer mass budget applied to a valley atmosphere control volume. The ventilation rate of tracer from the valley atmosphere to the above-ridgetop flows was calculated from the tracer mass budget. A dimensionless form of the ventilation rate is proposed. The Gaussian plume equation adequately represented (16% average deviation) the average nighttime plume centerline concentration, out to 8 km from the release. when the plume was fully contained in down-valley flows. This agreement was attained by accounting for plume reflections from the valley sidewalls and using measured turbulence statistics in the calculation of the dispersion coefficients. Beyond 8 km down valley from the release, the Brush Creek valley merged with the Roan Creek valley and the two airstreams mixed, resulting in a sudden dilution of the tracer plume. The Gaussian plume equation was not valid after the two airstreams merged. RP ALLWINE, KJ (reprint author), PACIFIC NW LAB, BATTELLE BLVD, POB 999, RICHLAND, WA 99352 USA. NR 34 TC 8 Z9 9 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD JUN PY 1993 VL 32 IS 6 BP 1017 EP 1037 DI 10.1175/1520-0450(1993)032<1017:ADATVI>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LF076 UT WOS:A1993LF07600001 ER PT J AU CHAN, HW CHEN, CP DAVIDSON, RC AF CHAN, HW CHEN, CP DAVIDSON, RC TI NUMERICAL STUDY OF RELATIVISTIC MAGNETRONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID E-BEAM DIODES; PHASE-LOCKING; MICROWAVE EMISSION; SIMULATION AB The relativistic multiresonator magnetron is analyzed in full cylindrical geometry, using the two-dimensional particle-in-cell simulation code MAGIC. Detailed comparisons are made between the simulation results and the classic experiments by Palevsky and Bekefi for the relativistic A6 magnetron configuration [Phys. Fluids 22, 986 (1979)]. The computer simulations show the same dependence of microwave power on axial magnetic field as measured in the experiment. It is found that the electron flow in the preoscillation regime differs substantially from ideal Brillouin flow, and that the nonlinear regime is characterized by large-amplitude spoke formation. By analyzing a class of relativistic magnetrons for a wide range of operating voltage and axial magnetic field, it is found that the optimal microwave power exhibits an approximately cubic dependence on the applied diode voltage. Moreover, the simulations indicate that relativistic magnetrons with small aspect ratio oscillate predominantly in the pi mode, whereas magnetrons with large aspect ratio can oscillate in various modes which depend upon the system parameters. Finally, it is shown that a finite power-supply impedance can strongly modify the resonance condition, thereby significantly degrading the magnetron performance. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. RP CHAN, HW (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 35 TC 26 Z9 27 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7053 EP 7060 DI 10.1063/1.352373 PG 8 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200006 ER PT J AU SASAKI, J SUGIYAMA, K YAO, X BROWN, I AF SASAKI, J SUGIYAMA, K YAO, X BROWN, I TI MULTIPLE-SPECIES ION-BEAMS FROM TITANIUM-HAFNIUM ALLOY CATHODES IN VACUUM-ARC PLASMAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHARGE-STATE DISTRIBUTIONS; GENERATION AB We have studied the ion spectra of the plasma produced by the metal vapor vacuum arc for the case when the cathode material is a solid solution TiHf alloy of variable composition ratio. A vacuum arc ion source was used to generate an intense beam of metal ions and a time-of-flight ion charge-to-mass diagnostic was used to measure the beam ion species and charge state distributions. A range of different cathode compositions was examined, from pure Ti to pure Hf and with five different alloy mixes between these extremes. We find that the ratio of ion currents in the multiple-species ion beam corresponds approximately to the ratio of elements in the cathode, and that the mean charge states of the elemental ion components remain approximately constant as the cathode composition ratio is changed. Multispecies metal ion beams can readily be generated in this way and the ion species characteristics of the beam are predictable. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP NIPPON STEEL CORP LTD, ELECTR RES LABS, 10-1 FUCHINOBE 5 CHOME, SAGAMIHARA, KANAGAWA 229, JAPAN. NR 23 TC 16 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7184 EP 7187 DI 10.1063/1.352390 PG 4 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200024 ER PT J AU MARTIN, JM NADELLA, RK VELLANKI, J RAO, MV HOLLAND, OW AF MARTIN, JM NADELLA, RK VELLANKI, J RAO, MV HOLLAND, OW TI THERMALLY STABLE, BURIED HIGH-RESISTANCE LAYERS IN P-TYPE INP OBTAINED BY MEV ENERGY TI IMPLANTATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SEMI-INSULATING INP; ION-IMPLANTATION; HIGH-RESISTIVITY; DEPTH PROFILES; FE; REDISTRIBUTION; BOMBARDMENT; CRYSTALS; GAAS AB High-energy Ti+ ions ranging from 1 to 5 MeV were implanted into p-type InP:Zn (for two different zinc concentrations) at both room temperature and 200-degrees-C. The range statistics for Ti implanted at various energies were calculated by analyzing the as-implanted profiles determined by secondary-ion mass spectrometry. Ti did not redistribute during post-implantation annealing except for a slight indiffusion, irrespective of the implant or annealing temperatures used. This behavior is different from the behavior of other implanted transition metals (Fe and Co) in InP, which redistributed highly when the implants were performed at room temperature. In the MeV Ti-implanted InP:Zn the background Zn showed a small degree of redistribution. Rutherford backscattering measurements showed a near virgin lattice perfection for 200-degrees-C implants after annealing. Buried layers with intrinsic resistivity were obtained by MeV Ti implantation in InP:Zn (p = 5 X 10(16) cm-3). C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. UNIV COMPLUTENSE MADRID, FAC FIS, DEPT ELECT & ELECTR, E-28040 MADRID, SPAIN. RP GEORGE MASON UNIV, DEPT ELECT & COMP ENGN, FAIRFAX, VA 22030 USA. NR 35 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7238 EP 7243 DI 10.1063/1.354011 PG 6 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200034 ER PT J AU ADDESSIO, FL JOHNSON, JN MAUDLIN, PJ AF ADDESSIO, FL JOHNSON, JN MAUDLIN, PJ TI THE EFFECT OF VOID GROWTH ON TAYLOR CYLINDER IMPACT EXPERIMENTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DUCTILE FRACTURE; MATERIAL FAILURE; NUCLEATION; LOCALIZATION; COALESCENCE; SOLIDS AB Taylor cylinder impact experiments have provided useful information concerning the dynamic response of materials. In an effort to obtain data at elevated strain rates, Taylor experiments have been conducted at high velocities. Sections of the recovered specimens reveal a region of porosity located near the base of the cylinders. Computational simulations have been performed to explore the effect of porosity growth on the experimentally observable parameters for Taylor impact tests. The constitutive model used to simulate the growth of voids is based on the Gurson yield surface. A robust and efficient numerical algorithm was developed and implemented into an explicit, two-dimensional, finite-element computer code. The calculations provided good qualitative comparison with experimental data. RP LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 22 TC 23 Z9 23 U1 1 U2 8 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7288 EP 7297 DI 10.1063/1.354018 PG 10 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200041 ER PT J AU CHALMERS, SA TSAO, JY GOSSARD, AC AF CHALMERS, SA TSAO, JY GOSSARD, AC TI TERRACE WIDTH EVOLUTION DURING STEP-FLOW GROWTH WITH MULTITERRACE ADATOM MIGRATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; (AL,GA)SB TILTED SUPERLATTICES; SUBSTRATE MISORIENTATION; DEPOSITION AB We have developed a computer-solvable model of step-flow growth that includes both anisotropic multiterrace adatom migration and asymmetric step edge attachment. We find that terrace widths equalize not only when each adatom preferentially attaches to the ascending step edge of the terrace that it lands on, but also when adatoms preferentially migrate over ascending step edges. This latter process can equalize long-range terrace width nonuniformities much more rapidly than can the former process. We also find that a slow lateral movement of terrace width distributions occurs when each adatom adheres to the step edges of the terrace that it lands on. More significantly, we find that a rapid lateral movement of terrace width distributions occurs when adatoms cross multiple step edges. This motion is especially fast when adatoms migrate distances that are comparable to or greater than the terrace width distribution period. We simulated the evolution of an experimentally observed (Al,Ga)Sb lateral superlattice (LSL) terrace width distribution, which led to quantitative estimates of the adatom migration characteristics present during the LSLs growth. At least one type of adatom, probably Ga, migrates nearly isotropically over many terraces. This method of determining adatom migration characteristics can be ''tended to any material system that allows LSL layers to be grown as terrace width markers. C1 UNIV CALIF SANTA BARBARA,DEPT MAT,SANTA BARBARA,CA 93106. RP CHALMERS, SA (reprint author), SANDIA NATL LABS,DIV 1311,ALBUQUERQUE,NM 87185, USA. NR 15 TC 15 Z9 15 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7351 EP 7357 DI 10.1063/1.354026 PG 7 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200049 ER PT J AU CHEN, L PIAZZA, TW SCHMIDT, BE KELSEY, JE KALOYEROS, AE HAZELTON, DW WALKER, MS LUO, L DYE, RC MAGGIORE, CJ WILKINS, DJ KNORR, DB AF CHEN, L PIAZZA, TW SCHMIDT, BE KELSEY, JE KALOYEROS, AE HAZELTON, DW WALKER, MS LUO, L DYE, RC MAGGIORE, CJ WILKINS, DJ KNORR, DB TI ON THE EFFECT OF PROCESSING PARAMETERS IN THE CHEMICAL-VAPOR-DEPOSITION OF YBA2CU3O7-DELTA THIN-FILMS ON POLYCRYSTALLINE SILVER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CRITICAL CURRENT DENSITIES; PULSED LASER DEPOSITION; TRANSPORT-PROPERTIES; GRAIN-BOUNDARIES; BICRYSTALS; SUBSTRATE AB Results are reported from an investigation of the effects of selected processing parameters on the morphology and properties of YBa2Cu3O7-delta (YBCO) superconducting thin films grown directly on polycrystalline silver substrates by chemical-vapor deposition (CVD). These results were achieved through a set of experimental studies which examined: (i) recrystallization mechanisms of polycrystalline silver and their effect on the deposition of YBCO thin films; and (ii) CVD processing conditions leading to the growth of high-quality YBCO films. The samples were analyzed using dynamic impedance, four-point resistivity probe, x-ray diffraction, Rutherford backscattering, and scanning electron microscopy. These studies showed that substrate temperature played a critical role not only in the formation of YBCO films, but also in the recrystallization of silver substrates, which in turn greatly influenced film growth. The studies also led to the identification of a two-stage processing scheme for the growth of YBCO films on silver. The first processing stage consisted of a substrate conditioning cycle which involved a 10 min ramping from room temperature to deposition temperature where the substrates were held for an additional 10 min in a flow of 70 sccm 02 at a reactor working pressure of 2 Torr. The second processing stage involved actual film deposition at 760-800-degrees-C for 3-10 min (depending on desired film thickness) in a mixed flow of 70 sccm O2 and 210 sccm N2O at a reactor working pressure of 4 Torr. Samples thus produced were highly oriented along the c axis perpendicular to the substrate with a zero resistance transition temperature of 87 K and a critical current density of 2 X 10(4) A/cm2, (77 K, B=0). The films had a thickness of 200-700 nm depending on the length of the growth cycle, which corresponded to the growth rates in the range 65-130 nm/min. A growth mechanism for YBCO on polycrystalline silver, which emphasized the role of silver recrystallization, was consequently proposed and discussed. C1 SUNY Albany, DEPT PHYS, ALBANY, NY 12222 USA. INTERMAGNET GEN CORP, GUILDERLAND, NY 12084 USA. LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RENSSELAER POLYTECH INST, DEPT MAT ENGN, TROY, NY 12180 USA. SUNY Albany, DEPT PHYS, ALBANY, NY 12222 USA. NR 25 TC 16 Z9 16 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7563 EP 7570 DI 10.1063/1.354007 PG 8 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200083 ER PT J AU MARTENS, JS HIETALA, VM VENTURINI, EL LEE, WY AF MARTENS, JS HIETALA, VM VENTURINI, EL LEE, WY TI THICKNESS DEPENDENCE OF ELECTRODYNAMIC PROPERTIES OF TLCABACUO THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MICROWAVE SURFACE-RESISTANCE AB The thickness dependence of electrodynamic properties of T12Ca2Ba2Cu3Ox films has been examined after correction for geometrical effects. The surface resistance increases for very thin or thick films as is consistent with the presence of a poorly superconducting layer (phase inclusions or morphology breakdown) as was detected with magnetization measurements. The temperature dependence of surface resistance has been examined at low temperatures and fitted to a multigap model. There was reasonable agreement for moderate thickness films, suggesting why such films have been and will be excellent for applications, while the behavior of other thicknesses may be dominated by grain boundaries. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP MARTENS, JS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 10 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7571 EP 7574 DI 10.1063/1.354008 PG 4 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200084 ER PT J AU KATAOKA, H BAIN, JA BRENNAN, S CLEMENS, BM AF KATAOKA, H BAIN, JA BRENNAN, S CLEMENS, BM TI CRYSTALLOGRAPHIC ANISOTROPY IN THIN-FILM MAGNETIC RECORDING MEDIA ANALYZED WITH X-RAY-DIFFRACTION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TEXTURE AB The crystallographic anisotropy of CoCr alloy films deposited on a Cr underlayer was investigated with grazing incidence x-ray scattering (GIXS). The effect of circumferential mechanical texturing of the NiP substrate (producing microgrooves through polishing) was explored. The Co was found to grow heteroepitaxially on the Cr underlayer with the Co(1120BAR) growth planes parallel to the Cr(001) growth planes. We observe no significant differences in Co lattice parameter in the circumferential and radial directions, although we do see variations in crystallographic texture between these two directions. From GIXS peak intensities, we observe that there is a greater population of crystallites with their c axis pointed along the grooves. This analysis was done after allowing for the effect of the varying local surface normal due to the substrate grooves. The ratio of the coercivities in the two directions scales with the ratios of the c-axis population densities. Two simple quantitative models of the magnetic properties of the aggregate have been constructed: strongly coupled grains and uncoupled grains. The predictions of these models are compared to the observed properties. C1 STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP KATAOKA, H (reprint author), HITACHI CORP,PROD ENGN RES LAB,YOKOHAMA,JAPAN. OI Bain, James/0000-0002-5355-5048 NR 12 TC 33 Z9 33 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7591 EP 7598 DI 10.1063/1.353979 PG 8 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200088 ER PT J AU SEAGER, CH WARREN, WL AF SEAGER, CH WARREN, WL TI PHOTODARKENING AND PARAMAGNETISM IN ULTRAVIOLET EXPOSED LEAD LANTHANUM ZIRCONATE CERAMICS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OPTICAL-ABSORPTION; AMORPHOUS-SILICON AB Electron paramagnetic resonance (EPR) and photothermal deflection spectroscopy (PDS) have been utilized to characterize samples of lead lanthanum zirconate titanate (PLZT) ceramics before and after ultraviolet (uv) irradiation. We find a variety of EPR resonances in the unirradiated samples, including those attributable to Cu+2 , Fe+3, Pb+3 , and Ti +3 ions. The dark optical absorption spectra show broad, exponential subgap absorption tails which increase in magnitude with decreasing grain size. In addition, some of the larger grain ceramics show a prominent absorption enhancement which seems to correlate well with the density of Ti+3 centers. During and after uv illumination with light near the PLZT band gap, substantial increases are seen in the density of paramagnetic Ti+3 and Pb+3 ions, and a broad absorption peak appears at approximately 2.6 eV. The spatial distribution of the induced absorption correlates well with the location of the absorbed uv, suggesting that photoproduced carrier pairs are trapped at Ti+4 and Pb+2 ions producing the observed paramagnetism. The Ti+3 EPR spectra can be successfully fit using the crystal-field-splitting parameters derived from the PDS data. We also observe that both the paramagnetism and the induced absorption are readily bleached by light absorbed in the spectral region where the photoinduced peak is located. We suggest that this effect is due to photoionization of the localized charges. RP SEAGER, CH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 38 TC 9 Z9 9 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7720 EP 7729 DI 10.1063/1.353970 PG 10 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200104 ER PT J AU DEYOREO, JJ WOODS, BW AF DEYOREO, JJ WOODS, BW TI A STUDY OF RESIDUAL-STRESS AND THE STRESS-OPTIC EFFECT IN MIXED-CRYSTALS OF K(DXH1-X)2PO4 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID KH2PO4 SINGLE-CRYSTALS; SEGREGATION; DIFFRACTION; DEFECTS; NEUTRON AB In electro-optic applications of the mixed crystal K(DxH1-x)2PO4 (KDP-KD*P), strain-induced refractive index variations result in beam depolarization and transmitted wave-front distortion. Here the combined linear stress-optic and electro-optic effects in crystals of KDP-KD*P oriented perpendicular to the c axis are analyzed and it is shown that while the depolarization is caused by the induced birefringence, the wave-front distortion is due to average index shifts. Furthermore, the birefringence is determined by the shear stress in the xy plane of the crystal while the average index shift depends only on the normal stresses. For depolarization losses of 0.1%-1% and wave-front distortion of 0.1-1lambda, the critical range of stress is 10(5)-10(6) Pa. Measured depolarization loss and wave-front distortion profiles of 5, 16, and 27 cm K(DxH1-x)2PO4 crystals for 0 less-than-or-equal-to x less-than-or-equal-to 0.98 are also presented. Using the analysis described above it is shows that the maximum internal stresses in these crystals are within the critical range, but that the area-averaged stresses are substantially lower. It is found that crystals from different locations along the length of a boule can have similar strain birefringence and wave-front distortion profiles indicating that the growth conditions which generate the internal strain persist throughout a significant portion of the growth history of the boule. It is also observed that the most highly strained crystals come from near the seed cap. Finally, potential sources of strain in KD*P are discussed and thermodynamic and structural arguments are given which suggest that inhomogeneities in the H/D ratio are a potential source of the strain in KD*P. RP DEYOREO, JJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 22 TC 17 Z9 17 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7780 EP 7789 DI 10.1063/1.353951 PG 10 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200112 ER PT J AU MCCAMY, JW LOWNDES, DH BUDAI, JD ZUHR, RA ZHANG, X AF MCCAMY, JW LOWNDES, DH BUDAI, JD ZUHR, RA ZHANG, X TI EPITAXIAL ZNS FILMS GROWN ON GAAS (001) AND (111) BY PULSED-LASER ABLATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; THIN-FILMS; HOMOEPITAXIAL GROWTH; DEPOSITION AB Pulsed KrF (248 nm) laser ablation of a polycrystalline ZnS target has been used to grow very smooth and carbon-free, epitaxial ZnS thin films on GaAs (001) and (111). Films were grown at temperatures of 150-450-degrees-C, using a rotating substrate heater and deposition geometry that produces highly uniform film thickness, without nucleation or surface-roughening problems. X-ray diffraction and high-resolution transmission electron microscopy (HRTEM) show that the ZnS films are fully epitaxial (in-plane aligned). Films grown at the optimum temperature of 325-degrees-C have x-ray rocking curve widths that are indistinguishable from molecular-beam-epitaxy-grown ZnS/GaAs films of the same thickness. Rutherford backscattering spectrometry and HRTEM show that in films approximately 275 nm thick, the approximately 150 nm nearest the GaAs-ZnS interface is highly faulted, due to the approximately 4.1 % lattice mismatch and/or the low ZnS stacking fault energy, but the upper approximately 125 nm is much less defective. The anisotropy of the ZnS epitaxial growth rate between the GaAs (001) and GaAs (111) surfaces was found to be slightly temperature dependent. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP UNIV TENNESSEE, DEPT MAT SCI & ENGN, KNOXVILLE, TN 37996 USA. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 24 TC 24 Z9 26 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7818 EP 7822 DI 10.1063/1.353956 PG 5 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200117 ER PT J AU FOSTER, CM CHAN, SK CHANG, HLM CHIARELLO, RP ZHANG, TJ GUO, J LAM, DJ AF FOSTER, CM CHAN, SK CHANG, HLM CHIARELLO, RP ZHANG, TJ GUO, J LAM, DJ TI ELECTROMAGNETIC MODES AND PRISM-FILM COUPLING IN ANISOTROPIC PLANAR WAVE-GUIDES OF EPITAXIAL (101) RUTILE THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OPTICAL GUIDED-WAVE; LIGHT-GUIDES; INTEGRATED OPTICS; RADIATION AB We report optical waveguiding in single-crystal, epitaxial (101) oriented rutile (TiO2) thin films grown on (1120BAR) sapphire (alpha-Al2O3) substrates using the metal-organic chemical vapor deposition technique. The electromagnetic field distributions and propagation constants for asymmetric planar waveguides composed of an anisotropic dielectric media applicable to these films are derived. Modifications to the prism-film coupling theory for this anisotropic case are also discussed. By application of this model to (101) oriented rutile thin films, we directly obtain values of the ordinary and extraordinary refractive indexes, n0 and n(e), of the rutile thin films as well as film thicknesses. We obtain typical values of the refractive indexes (n0=2.5701+/-0.0005; n(e)=2.934+/-0.001) near to those for bulk rutile single crystals indicating the exceptional quality of these films. RP FOSTER, CM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 46 TC 17 Z9 17 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1993 VL 73 IS 11 BP 7823 EP 7830 DI 10.1063/1.353931 PG 8 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200118 ER PT J AU BIRN, J HESSE, M SCHINDLER, K AF BIRN, J HESSE, M SCHINDLER, K TI WHAT DETERMINES THE LATITUDINAL EXTENT OF THE AURORAL ACCELERATION REGION SO JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS LA English DT Article; Proceedings Paper CT TOPICAL SYMP ON MAGNETOSPHERIC PHENOMENA, AT THE 20TH GENERAL ASSEMBLY OF THE INTERNATIONAL UNION OF GEODESY AND GEOPHYSICS CY AUG, 1991 CL VIENNA, AUSTRIA SP INT UNION GEODESY & GEOPHYS ID FIELD-ALIGNED CURRENTS; SUBSTORM CURRENT WEDGE; BIRKELAND CURRENTS; MAGNETOTAIL RECONNECTION; MAGNETIC-FIELD; BOUNDARY-LAYER; CURRENT SYSTEM; GROWTH-PHASE; SOLAR-WIND; MAGNETOSPHERE AB Characteristic scales associated with auroral precipitation are investigated on the basis of quasistatic magnetotail models, resistive MHD simulations of magnetotail dynamics, and a general relation between parallel electric fields and velocity shear. Since the inverted-V precipitation region of discrete auroras (on the dusk side) is associated with upward flowing, region 1, currents, we investigate the distribution of these currents first. The overall distribution of region 1 type field-aligned currents and their dynamic changes can be explained by characteristic scales in the magnetotail and their mapping to the ionosphere. The quiet time region 1 currents are associated with the decrease of tail flaring. Their overall extent in the north-south direction is closely related to the scale height of the cross-tail current. Dynamic region 1 currents are related to the velocity shear of earthward flow, which can be generated by a tail instability. In that case the peaks of the enhanced region 1 currents are found to map closer to midnight and to lower latitudes than the quiet region 1 currents, consistent with average observations [IIJIMA and POTEMRA (1976a), J. geophys. Res. 81, 21651. On the basis of a general relation between parallel electric fields and 'slippage' in the plasma transport [HESSE and SCHINDLER (1988), J. geophys. Res. 93, 5559; SCHINDLER et al. (1991), Astrophys. J. 380, 293], we make estimates of the spatial extent of nonideal regions, where parallel electric fields may exist. For a plausible model of substorm reconfiguration, we find a latitudinal extent of about 7 km for a time scale of 1 min and a integrated parallel electric field of 5 kV. The length scale is proportional to the time scale. The sign of this parallel electric field is consistent with downward acceleration of electrons on the dusk side. The spatial extent of the parallel electric field region is independent of the microscopic generation mechanism if the time scale and the characteristic parallel potential difference (i.e. the integrated parallel electric field) are independent of this mechanism. C1 RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. RP BIRN, J (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 37 TC 6 Z9 6 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0021-9169 J9 J ATMOS TERR PHYS JI J. Atmos. Terr. Phys. PD JUN PY 1993 VL 55 IS 8 BP 1171 EP 1184 DI 10.1016/0021-9169(93)90045-Z PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LF104 UT WOS:A1993LF10400007 ER PT J AU WOS, L AF WOS, L TI THE KERNEL STRATEGY AND ITS USE FOR THE STUDY OF COMBINATORY-LOGIC SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE KERNEL STRATEGY; COMBINATORY LOGIC AB Barendregt defines combinatory logic as an equational system satisfying the combinators S and K with ((Sx)y)z = (xz)(yz) and (Kx)y = x; the set consisting of S and K provides a basis for all of combinatory logic. Rather than studying all of the logic, logicians often focus on fragments of the logic, subsets whose basis is obtained by replacing S or K or both by other combinators. In this article, we present a powerful new strategy, called the kernel strategy, for studying fragments in the context of questions concerned with fixed point properties. Interest in such properties rests in part with their relation to normal forms and paradoxes. We show how the kernel strategy was used to answer a number of open questions, offering abundant evidence that the availability of the kernel strategy marks a singular advance for automated reasoning. In all of our experiments with this strategy applied by an automated reasoning program, the rate of success has been impressively high and the CPU time to obtain the desired information startlingly small. For each fragment we study, we use the kernel strategy to attempt to determine whether the strong or the weak fixed point property holds. Where A is a given fragment with basis B, the strong fixed point property holds for A if and only if there exists a combinator y such that, for all combinators x, yx = x(yx), where y is expressed purely in terms of elements of B. The weak fixed point property holds for A if and only if for all combinators x there exists a combinator y such that y = xy, where y is expressed purely in terms of the elements of B and the combinator x. Because the use of the kernel strategy is so effective in addressing questions focusing on either fixed point property, its formulation marks an important advance for combinatory logic. Perhaps of especial interest to logicians is an infinite class of infinite sets of tightly coupled fixed point combinators (presented here), whose unexpected discovery resulted directly from the application of the strategy by an automated reasoning program. We also offer various open questions for possible research and focus on an automated reasoning program and input files that may prove useful for such research. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. NR 25 TC 9 Z9 9 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-7433 J9 J AUTOM REASONING JI J. Autom. Reasoning PD JUN PY 1993 VL 10 IS 3 BP 287 EP 343 DI 10.1007/BF00881795 PG 57 WC Computer Science, Artificial Intelligence SC Computer Science GA MH624 UT WOS:A1993MH62400001 ER PT J AU WOS, L AF WOS, L TI THE PROBLEM OF REASONING BY ANALOGY SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE REASONING BY ANALOGY; REPRESENTATION; UNSOLVED RESEARCH PROBLEM AB This article is the twenty-seventh of a series of articles discussing various open research problems in automated reasoning. The problem proposed for research asks one to find criteria that an automated reasoning program can apply to determine whether to attack a given question with reasoning by analogy. The imprecise term 'reasoning by analogy' refers to a type of reasoning in which the type of proof being sought is sharply influenced by the style of proof that was successfully used to prove related theorems. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0168-7433 EI 1573-0670 J9 J AUTOM REASONING JI J. Autom. Reasoning PD JUN PY 1993 VL 10 IS 3 BP 421 EP 422 DI 10.1007/BF00881800 PG 2 WC Computer Science, Artificial Intelligence SC Computer Science GA MH624 UT WOS:A1993MH62400006 ER PT J AU SETLIK, RF GARDUNOJUAREZ, R MANCHESTER, JI SHIBATA, M ORNSTEIN, RL REIN, R AF SETLIK, RF GARDUNOJUAREZ, R MANCHESTER, JI SHIBATA, M ORNSTEIN, RL REIN, R TI MODELING STUDY ON THE CLEAVAGE STEP OF THE SELF-SPLICING REACTION IN GROUP-I INTRONS SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID PHOSPHORYL-TRANSFER-REACTIONS; INTERVENING SEQUENCE RNA; BASE-CATALYZED-HYDROLYSIS; TETRAHYMENA RIBOZYME; SEMIEMPIRICAL METHODS; 3-DIMENSIONAL MODEL; ACTIVE-SITE; BINDING; PARAMETERS; PHOSPHATE AB A three-dimensional model of the Tetrahymena thermophila group I intron is used to further explore the catalytic mechanism of the transphosphorylation reaction of the cleavage step. Based on the coordinates of the catalytic core model proposed by Michel and Westhof (Michel, F., Westhof, E.J MoL Biol. 216,585-610 (1990)), we first converted their ligation step model into a model of the cleavage step by the substitution of several bases and the removal of helix P9. Next, an attempt to place a trigonal bipyramidal transition state model in the active site revealed that this modified model for the cleavage step could not accommodate the transition state due to insufficient space. A lowering of P 1 helix relative to surrounding helices provided the additional space required. Simultaneously, it provided a better starting geometry to model the molecular contacts proposed by Pyle et al. (Pyle, A. M., Murphy, F. L., Cech, T. R. Nature 358,123-128.(1992)), based on mutational studies involving the J8/7 segment Two hydrated Mg2+ complexes were placed in the active site of the ribozyme model, using the crystal structure of the functionally similar Klenow fragment (Beese, L.S., Steitz, T.A. EMBO J. 10,25-33(1991)) as a guide. The presence of two metal ions in the active site of the intron differs from previous models, which incorporate one metal ion in the catalytic site to fulfill the postulated roles of Mg2+ in catalysis. The reaction profile is simulated based on a trigonal bipyramidal transition state, and the role of the hydrated Mg2+ complexes in catalysis is further explored using molecular orbital calculations. C1 ROSWELL PK CANC INST, DEPT BIOPHYS, 666 ELM ST, BUFFALO, NY 14263 USA. Univ Nacl Autonoma Mexico, INST FIS, CUERNAVACA 62191, MORELOS, MEXICO. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 47 TC 6 Z9 6 U1 0 U2 0 PU ADENINE PRESS PI SCHENECTADY PA 2066 CENTRAL AVE, SCHENECTADY, NY 12304 USA SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD JUN PY 1993 VL 10 IS 6 BP 945 EP 972 PG 28 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA LG865 UT WOS:A1993LG86500002 PM 8357544 ER PT J AU CHANG, YF SOMORJAI, GA HEINEMANN, H AF CHANG, YF SOMORJAI, GA HEINEMANN, H TI OXIDATIVE COUPLING OF METHANE OVER MG-LI OXIDE CATALYSTS AT RELATIVELY LOW-TEMPERATURE - THE EFFECT OF STEAM SO JOURNAL OF CATALYSIS LA English DT Article ID DEFECT; OXYDEHYDROGENATION; A-SIO2 RP CHANG, YF (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 16 TC 19 Z9 20 U1 1 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD JUN PY 1993 VL 141 IS 2 BP 713 EP 720 DI 10.1006/jcat.1993.1175 PG 8 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA LE311 UT WOS:A1993LE31100033 ER PT J AU MCCORMACK, EF PRATT, ST DEHMER, PM DEHMER, JL AF MCCORMACK, EF PRATT, ST DEHMER, PM DEHMER, JL TI DISSOCIATION DYNAMICS OF HIGH-V RYDBERG STATES OF MOLECULAR-HYDROGEN SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PHOTOELECTRON ANGULAR-DISTRIBUTIONS; QUANTUM-DEFECT THEORY; RESONANT MULTIPHOTON IONIZATION; POTENTIAL-ENERGY CURVES; DOUBLY EXCITED-STATES; VIBRATIONAL BRANCHING RATIOS; D 1PIU STATES; HIGH-RESOLUTION; CROSS-SECTIONS; PHOTOIONIZATION DYNAMICS AB A high-resolution, state-selective investigation of the decay of (X 2SIGMA(g)+)np, upsilon' greater-than-or-equal-to 9 Rydberg states of H-2 into the H(1s) + H(31) and H(1s) + H(41) dissociation continua has been performed. The (X 2SIGMA(g)+) np Rydberg states were excited by double-resonance excitation via the EF 1SIGMA(g)+, upsilon = 6, J = 0 and 1 states, and the H(31) and H(41) dissociation products were detected by monitoring the energy-resolved photoelectrons produced by nonresonant photoionization of the fragments. The energy region of interest (138 800-140 000 cm includes the X 2SIGMA(g)+ upsilon+ = 9, N+ = 0-3 ionization thresholds, the H(1s) + H(41) dissociation threshold, and the H+ + H- ion-pair threshold. Evidence of both direct and indirect dissociation involving both singly and doubly excited electronic states is observed. Comparisons to the previously observed X 2SIGMA(g)+, upsilon+ = 8 constant-ionic-state photoelectron spectrum and the ion-pair spectrum observed in the same energy region reveal strong competition between the ionization and dissociation processes through both rovibrational and electronic interactions. RP MCCORMACK, EF (reprint author), ARGONNE NATL LAB, ARGONNE, IL 60439 USA. NR 76 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 JUN 1 PY 1993 VL 98 IS 11 BP 8370 EP 8383 DI 10.1063/1.464495 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200002 ER PT J AU ALVARENGA, AD GRIMSDITCH, M BODNAR, RJ AF ALVARENGA, AD GRIMSDITCH, M BODNAR, RJ TI ELASTIC PROPERTIES OF WATER UNDER NEGATIVE PRESSURES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ATMOSPHERE CONFINING PRESSURE; SYNTHETIC FLUID INCLUSIONS; LIQUID WATER; SYSTEMATICS; NUCLEATION; DENSITY; QUARTZ; KBAR; PVT AB Using Brillouin scattering we have investigated the elastic properties of water under negative pressures. The samples were H2O liquid-vapor inclusions in alpha-quartz which could be heated to their homogenization temperatures (in the range 120-370-degrees-C); on cooling, negative pressures as high as 1000 bars were reached before a vapor bubble nucleated. The velocity of sound results obtained from our Brillouin experiments indicate that nucleation occurs long before reaching the mechanical instability region where the bulk modulus is zero. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. VIRGINIA POLYTECH INST & STATE UNIV,DEPT GEOL SCI,BLACKSBURG,VA 24061. RI Bodnar, Robert/A-1916-2009; Alvarenga, Ana Paula/M-9790-2014 NR 22 TC 45 Z9 45 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1993 VL 98 IS 11 BP 8392 EP 8396 DI 10.1063/1.464497 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200004 ER PT J AU MESSINA, M SCHENTER, GK GARRETT, BC AF MESSINA, M SCHENTER, GK GARRETT, BC TI CENTROID-DENSITY QUANTUM RATE THEORY - VARIATIONAL OPTIMIZATION OF THE DIVIDING SURFACE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSITION-STATE THEORY; PATH INTEGRAL APPROACH; RATE CONSTANTS; NONSEPARABLE SYSTEMS; CONDENSED PHASES; MODEL; LIMIT AB A generalization of Feynman path integral quantum activated rate theory is presented that has classical variational transition state theory as its foundation. This approach is achieved by recasting the expression for the rate constant in a form that mimics the phase-space integration over a dividing surface that is found in the classical theory. Centroid constrained partition functions are evaluated in terms of phase-space imaginary time path integrals that have the coordinate and momenta centroids tied to the dividing surface. The present treatment extends the formalism developed by Voth, Chandler, and Miller [J. Chem. Phys. 91, 7749 (1989)] to arbitrary nonplanar and/or momentum dependent dividing surfaces. The resulting expression for the rate constant reduces to a strict variational upper bound to the rate constant in both the harmonic and classical limits. In the case of an activated system linearly coupled to a harmonic bath, the dividing surface may contain explicit solvent coordinate dependence so that one can take advantage of previously developed influence functionals associated with the harmonic bath even with nonplanar or momentum dependent dividing surfaces. The theory is tested on the model two-dimensional system consisting of an Eckart barrier linearly coupled to a single, harmonic oscillator bath. The resulting rate constants calculated from our approximate theory are in excellent agreement with previous accurate results obtained from accurate quantum mechanical calculations [McRae et al., J. Chem. Phys. 97, 7392 (1992)]. RP MESSINA, M (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Garrett, Bruce/F-8516-2011; Schenter, Gregory/I-7655-2014 OI Schenter, Gregory/0000-0001-5444-5484 NR 54 TC 37 Z9 39 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1993 VL 98 IS 11 BP 8525 EP 8536 DI 10.1063/1.464511 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200019 ER PT J AU MARTIN, RL HAY, PJ AF MARTIN, RL HAY, PJ TI CLUSTER STUDIES OF LA2CUO4CUO6 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EFFECTIVE CORE POTENTIALS; ELECTRONIC-STRUCTURE; MOLECULAR CALCULATIONS; SUPERCONDUCTIVITY; LA2-XSRXCUO4; TC; PARAMETERS AB We present the results of ab initio calculations for a CuO6 cluster embedded in a background potential appropriate for La2CuO4. These calculations differ from prior work in that an improved embedding potential for the cluster is utilized which enforces orthogonality between the cluster electrons and the background point charges. This is accomplished through the use of effective core potentials to represent the point charges nearest the CuO6 cluster. The major qualitative change this brings about is a destabilization of the Cu4s level relative to the Cu3d orbital. The cluster results for n doping now give a 3d10 configuration for Cu as opposed to the 3d(9)4s configuration observed in earlier work. In addition, much more extensive treatments of electron correlation have been examined using the technique of configuration interaction (CI). Results for n-doped, undoped, and p-doped clusters are presented. The ligand --> metal charge transfer excitations, the crystal-field spectrum, and the photoemission spectrum are discussed. Special attention is given to the characterization of the wave function for the p-doped cluster. While the loss in electron density is almost entirely from the 02p(sigma) orbital, in agreement with experiment, it is shown that the wave function is closer to the independent-particle ''molecular orbital'' limit than the ''valence-bond'' local singlet, and that a description of the cluster ion ground states in terms of the occupation of a single ''effective'' Cu 3d orbital is possible. RP MARTIN, RL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MSB268,LOS ALAMOS,NM 87545, USA. NR 37 TC 42 Z9 42 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1993 VL 98 IS 11 BP 8680 EP 8690 DI 10.1063/1.464475 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200036 ER PT J AU MARTIN, RL AF MARTIN, RL TI CLUSTER STUDIES OF LA2CUO4 - A MAPPING ONTO THE PARISER-PARR-POPLE (PPP) MODEL SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article AB The techniques of ab initio electronic structure theory are used to study Cu2O7 and Cu2O11 cluster models of La2Cu04. Fair agreement is obtained with the experimentally determined spin exchange constant J (90 meV calculated vs 125 meV measured) at the expense of quite large configuration interactions (CI) expansions. Results for various charge states of the cluster are well described by a ''single-band'' Pariser-Parr-Pople (PPP) model. As in earlier local-density-functional (LDF) based parameter determinations, the present work suggests these materials fall in the strong coupling regime. However, a significant intersite Coulomb repulsion is found in the present research. It is of sufficient strength V approximately U/5 to indicate that charge fluctuations may be more important in these materials than generally believed. RP MARTIN, RL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MSB268,LOS ALAMOS,NM 87545, USA. NR 12 TC 40 Z9 40 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1993 VL 98 IS 11 BP 8691 EP 8697 DI 10.1063/1.464476 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200037 ER PT J AU SAALFRANK, P MILLER, WH AF SAALFRANK, P MILLER, WH TI TIME-INDEPENDENT QUANTUM DYNAMICS FOR DIATOM SURFACE SCATTERING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID INTEGRAL CROSS-SECTIONS; DISCRETE VARIABLE REPRESENTATIONS; KOHN VARIATIONAL PRINCIPLE; S-MATRIX VERSION; TRANSITION-STATE THEORY; REACTIVE SCATTERING; DISSOCIATIVE ADSORPTION; H-2 DISSOCIATION; NICKEL SURFACES; METAL-SURFACES AB Two time-independent quantum reactive scattering methods, namely, the S-matrix Kohn technique to compute the full S-matrix, and the absorbing boundary Green's function method to compute cumulative reaction probabilities, are applied here to the case of diatom-surface scattering. In both cases a discrete variable representation for the operators is used. We test the methods for two- and three-dimensional uncorrugated potential energy surfaces, which have been used earlier by Halstead et al. [J. Chem. Phys. 93, 2359 (1990)] and by Sheng et al. V. Chem. Phys. 97, 684 (1992)] in studies of H-2 dissociating on metal substrates with theoretical techniques different from those applied here. We find overall but not always perfect agreement with these earlier studies. Based on ab initio data and experiment, a new, six-dimensional potential energy surface for the dissociative chemisorption of H-2 on Ni(100) is proposed. Two- and three-dimensional cuts through the new potential are performed to illustrate special dynamical aspects of this particular molecule-surface reaction: (i) the role of corrugation effects, (ii) the importance of the ''cartwheel'' rotation of H-2 , and (iii) the role of the ''helicopter'' degree of freedom for the adsorbing molecule. C1 LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP SAALFRANK, P (reprint author), LAWRENCE BERKELEY LAB, DEPT CHEM, BERKELEY, CA 94720 USA. OI Saalfrank, Peter/0000-0002-5988-5945 NR 83 TC 31 Z9 31 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1993 VL 98 IS 11 BP 9040 EP 9052 DI 10.1063/1.464464 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200078 ER PT J AU FOURNIER, R SINNOTT, SB DEPRISTO, AE AF FOURNIER, R SINNOTT, SB DEPRISTO, AE TI DENSITY-FUNCTIONAL STUDY OF THE BONDING IN SMALL SILICON CLUSTERS (VOL 97, PG 4149, 1992) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Correction, Addition C1 IOWA STATE UNIV SCI & TECHNOL,US DEPT ENERGY,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP FOURNIER, R (reprint author), NATL RES COUNCIL CANADA,STEACIE INST MOLEC SCI,100 SUSSEX DR,OTTAWA K1A 0R6,ONTARIO,CANADA. RI Sinnott, Susan/P-8523-2014 OI Sinnott, Susan/0000-0002-3598-0403 NR 1 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1993 VL 98 IS 11 BP 9222 EP 9222 DI 10.1063/1.465119 PG 1 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LE412 UT WOS:A1993LE41200098 ER PT J AU FEINGOLD, KR KRAUSS, RM PANG, MY DOERRLER, W JENSEN, P GRUNFELD, C AF FEINGOLD, KR KRAUSS, RM PANG, MY DOERRLER, W JENSEN, P GRUNFELD, C TI THE HYPERTRIGLYCERIDEMIA OF ACQUIRED-IMMUNODEFICIENCY-SYNDROME IS ASSOCIATED WITH AN INCREASED PREVALENCE OF LOW-DENSITY-LIPOPROTEIN SUBCLASS PATTERN-B SO JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM LA English DT Article ID TUMOR-NECROSIS-FACTOR; PLASMA; INFECTION; SUBFRACTIONS; CYTOKINES; LIPIDS; RISK AB Plasma low density lipoproteins (LDL) comprise multiple discrete subclasses, differing in size, density, and chemical composition. Gradient gel electrophoresis of LDL has demonstrated three common subclass patterns based on the predominant LDL subclass: large LDL, designated subclass pattern A; small LDL particles, designated subclass pattern B; and an intermediate pattern. Genetic studies have demonstrated that these patterns are inherited, but several lines of evidence suggest that environmental factors are important in the phenotypic expression of the pattern. The LDL B pattern is associated with increased levels of plasma triglyceride, reduced high density lipoprotein (HDL), and obesity. To better define the role of environmental factors on LDL phenotypic expression, we determined LDL patterns in patients with the acquired immunodeficiency syndrome (AIDS), an infection characterized by hypertriglyceridemia and weight loss. Similar to previous studies, plasma triglyceride levels were increased, whereas plasma cholesterol, LDL cholesterol, and HDL cholesterol levels were decreased in the AIDS subjects compared to those in age-matched controls. The percentage of AIDS subjects with the LDL B phenotype was increased 2.5-fold, demonstrating an increased prevalence of the LDL B phenotype in an acquired form of hypertriglyceridemia. For each LDL phenotype in AIDS, serum triglyceride levels were higher than the same phenotypic pattern in controls, with the most marked elevations in triglycerides found in AIDS subjects with the LDL B phenotype. In contrast to what was observed in controls, HDL cholesterol levels were decreased in all AIDS subjects and were unrelated to LDL pattern. Total and LDL cholesterol levels were higher in controls with the LDL B phenotype than in those with the LDL A phenotype, but there was no difference in total and LDL cholesterol in AIDS subjects with LDL B compared to A. On multiple regression analysis in subjects with AIDS, plasma triglyceride levels, age, and HDL cholesterol all contribute to the occurrence of the LDL B phenotype, but elevations in plasma triglyceride levels are the strongest independent predictor. Body mass index was not a predictor of LDL B phenotype in AIDS. These results suggest that disturbances in triglyceride metabolism that are caused by AIDS lead to the appearance of the LDL subclass B phenotype and provide further evidence that environmental or disease states that perturb lipid metabolism can produce an increased prevalence of the LDL B phenotype. C1 UNIV CALIF SAN FRANCISCO, DEPT MED, SAN FRANCISCO, CA 94143 USA. DEPT VET AFFAIRS MED CTR, MED SERV, INFECT DIS SECT, SAN FRANCISCO, CA 94121 USA. UNIV CALIF BERKELEY, DONNER LAB, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV LIFE SCI, DEPT MOLEC & NUCL MED, BERKELEY, CA 94720 USA. RP FEINGOLD, KR (reprint author), DEPT VET AFFAIRS MED CTR, MED SERV, METAB SECT 111F, 4150 CLEMENT ST, SAN FRANCISCO, CA 94121 USA. FU NHLBI NIH HHS [HL-18754]; NIDDK NIH HHS [DK-40990] NR 35 TC 138 Z9 143 U1 0 U2 0 PU ENDOCRINE SOC PI CHEVY CHASE PA 8401 CONNECTICUT AVE, SUITE 900, CHEVY CHASE, MD 20815-5817 USA SN 0021-972X EI 1945-7197 J9 J CLIN ENDOCR METAB JI J. Clin. Endocrinol. Metab. PD JUN PY 1993 VL 76 IS 6 BP 1423 EP 1427 DI 10.1210/jc.76.6.1423 PG 5 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA LF088 UT WOS:A1993LF08800007 PM 8501146 ER PT J AU KLEMAS, VV DOBSON, JE FERGUSON, RL HADDAD, KD AF KLEMAS, VV DOBSON, JE FERGUSON, RL HADDAD, KD TI A COASTAL LAND-COVER CLASSIFICATION-SYSTEM FOR THE NOAA COASTWATCH CHANGE ANALYSIS PROJECT SO JOURNAL OF COASTAL RESEARCH LA English DT Article AB A land cover classification system for coastal uplands, wetlands, and photic submersed habitats has been developed for NOAA's C-CAP Project in support of management of fisheries habitats and living marine resources and to provide opportunities for federal, state, and regional cooperation and data sharing. The classification system is hierarchical, reflects ecological relationships, optimizes discrimination by satellite remote sensors, and is usable with Geographic Information Systems (GIS). It is compatible with other data bases, e.g., the National Wetland Inventory (NWI) and the USGS Land Use/Land Cover Classification System. The C-CAP classification system includes three major categories: uplands, wetlands, and water and submerged lands. While the latter two categories are the primary areas of interest for NOAA, uplands are also included because land use there may influence adjacent wetlands and water bodies. The C-CAP classification was designed for use with satellite imagery; it represents an adaptation of three earlier systems: ANDERSON et al. (1976), COWARDIN et al. (1979), and USGS (1992). C1 NOAA,NATL MARINE FISHERIES SERV,BEAUFORT LAB,BEAUFORT,NC 28516. STATE FLORIDA DEPT NAT RESOURCES,ST PETERSBURG,FL 33701. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KLEMAS, VV (reprint author), UNIV DELAWARE,COLL MARINE STUDIES,NEWARK,DE 19716, USA. NR 34 TC 48 Z9 51 U1 1 U2 10 PU COASTAL EDUCATION & RESEARCH FOUNDATION PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0749-0208 J9 J COASTAL RES JI J. Coast. Res. PD SUM PY 1993 VL 9 IS 3 BP 862 EP 872 PG 11 WC Environmental Sciences; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA LK503 UT WOS:A1993LK50300019 ER PT J AU NOVAK, CF AF NOVAK, CF TI MODELING MINERAL DISSOLUTION AND PRECIPITATION IN DUAL-POROSITY FRACTURE MATRIX SYSTEMS SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID NATURAL-WATERS; FISSURED ROCK; TRANSPORT; MEDIA; FLOW; PREDICTION; DIFFUSION; SOLUBILITIES; 25-DEGREES-C; MIGRATION AB A dual-porosity chemical transport model is applied to saturated fractured porous media. In this model, transport through fractures is advection-dominated while transport within the matrix and between the matrix and the fractures is diffusion-dominated. Recent studies in the literature indicate that conservative tracers and radionuclides in these systems will be retarded by matrix diffusion even in the absence of chemical reactions. This study examines systems that include chemical reactions (e.g., dissolution/precipitation and aqueous complexation) and examines changes in retardation caused by precipitation. The two-dimensional simulation domain consists of a single fracture and the adjacent permeable matrix. The system is modeled using finite differences and a chemical equilibrium simulator based cn the Villars-Cruise-Smith algorithm. A constant flow rate is assumed in the fracture, and diffusion rates are functions of the local matrix porosity. Results from simulations with idealized chemistry are presented and discussed to illustrate basic characteristics of this system. These characteristics include both advection-induced and diffusion-induced sequential dissolution/precipitation waves. Results are contrasted with limiting single porosity cases. An additional simulation using the Pitzer activity coefficient model illustrates the chemical retardation of a contaminant due to contaminant precipitation. RP SANDIA NATL LABS, DEPT FLUID FLOW & TRANSPORT 6119, POB 5800, ALBUQUERQUE, NM 87185 USA. NR 29 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 EI 1873-6009 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD JUN PY 1993 VL 13 IS 1-4 BP 91 EP 115 DI 10.1016/0169-7722(93)90052-T PG 25 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA LM278 UT WOS:A1993LM27800007 ER PT J AU BRUSH, LH AF BRUSH, LH TI ASSESSMENT OF RADIONUCLIDE RETARDATION - USES AND ABUSES OF NATURAL ANALOG STUDIES - RESPONSE SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Letter ID DEEP-SEA SEDIMENTS; PORE WATERS; URANIUM RP BRUSH, LH (reprint author), SANDIA NATL LABS,DIV 6345,ALBUQUERQUE,NM 87185, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD JUN PY 1993 VL 13 IS 1-4 BP 269 EP 270 DI 10.1016/0169-7722(93)90064-Y PG 2 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA LM278 UT WOS:A1993LM27800019 ER PT J AU COLUMBIA, MR CRABTREE, AM THIEL, PA AF COLUMBIA, MR CRABTREE, AM THIEL, PA TI CHEMICAL-REACTIONS BETWEEN ATOMIC OXYGEN AND FORMIC-ACID ON PT(111) SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID SMALL ORGANIC-MOLECULES; THERMAL-DESORPTION; SOLID-SURFACES; WATER; ADSORPTION; OXIDATION; SPECTROSCOPY; FORMALDEHYDE; HCOOH; BASE AB We have studied the influence of 0.25 monolayer of atomic oxygen on the interaction between formic acid and the (111) surface of Pt using the techniques of thermal desorption spectroscopy and high resolution electron energy loss spectroscopy. At low coverages of formic acid the reaction proceeds exclusively via unimolecular decomposition of a formate intermediate, as it would also on the clean surface. Atomic oxygen reacts with the hydrogen released to form gaseous water; two distinct desorption states of water are assigned to reactions with the acid and acyl protons. At high coverages of formic acid there is evidence for new pathways other than unimolecular decomposition. These include reaction between formate and hydroxyl to produce CO2 and H2O at temperatures below 200 K and reaction between formate and water to produce dimeric, gaseous HCOOH. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP COLUMBIA, MR (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 36 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 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD JUN 1 PY 1993 VL 351 IS 1-2 BP 207 EP 226 DI 10.1016/0022-0728(93)80235-A PG 20 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA LH765 UT WOS:A1993LH76500015 ER PT J AU CAMPBELL, AN MIKAWA, RE KNORR, DB AF CAMPBELL, AN MIKAWA, RE KNORR, DB TI RELATIONSHIP BETWEEN TEXTURE AND ELECTROMIGRATION LIFETIME IN SPUTTERED AL-1-PERCENT SI THIN-FILMS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT SYMP ON DEVELOPMENT OF MICROSTRUCTURE AND TEXTURE IN MATERIALS FOR ELECTRONIC APPLICATIONS, AT MATERIALS WEEK 92 CY NOV 02-04, 1992 CL CHICAGO, IL SP ASM INT, MAT SCI DIV, TEXTURE & ANISOTROPY COMM, MINERALS MET & MAT SOC, ELECTR MAGNET & PHOTON MAT DIV, ELECTR PACKAGING &, INTERCONNECT MAT COMM DE BIMODAL GRAIN SIZE DISTRIBUTION; ELECTROMIGRATION LIFETIME; FIBER TEXTURE; GRAIN SIZE; METALLIZATION ID INDUCED FAILURES; DEPENDENCE; INTERCONNECTS AB The relationship among the grain structure, texture, and electromigration lifetime of four Al-1% silicon metallizations produced under similar sputtering conditions was explored. The grain sizes and distributions were similar and the grain structure was near-bamboo for all metallizations. All metallizations exhibited a near-(111) fiber texture, as determined by the pole figure technique. Differences in electromigration behavior were noted. Three of the metallizations exhibited a bimodal failure distribution while the fourth was monomodal and had the longest electromigration lifetime. The electromigration lifetime was directly related to the strength of the (111) fiber texture in the metallization as anticipated. However, whereas the grain size distribution has an effect on the electromigration lifetime when metallization lines are several grains wide, the electromigration lifetime of these near-bamboo metallizations appeared independent of the grain structure. It was also observed that a number of failures occurred in the 8 mum interconnect supplying the 5 mum wide test lines. This apparently reflects an increased susceptibility of the wider interconnect lines to electromigration damage. C1 RENSSELAER POLYTECH INST,DEPT MAT ENGN,TROY,NY 12180. RP CAMPBELL, AN (reprint author), SANDIA NATL LABS,DEPT 2275,ALBUQUERQUE,NM 87185, USA. NR 20 TC 28 Z9 28 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUN PY 1993 VL 22 IS 6 BP 589 EP 596 DI 10.1007/BF02666403 PG 8 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LF091 UT WOS:A1993LF09100003 ER PT J AU GRAHAM, AL MONDY, LA ABBOTT, JR BRENNER, H AF GRAHAM, AL MONDY, LA ABBOTT, JR BRENNER, H TI RESEARCH DIRECTIONS IN CONCENTRATED SUSPENSIONS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. MIT,DEPT CHEM ENGN,CAMBRIDGE,MA 02139. RP GRAHAM, AL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 0 Z9 0 U1 1 U2 1 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 JUN PY 1993 VL 115 IS 2 BP 193 EP 194 DI 10.1115/1.2910122 PG 2 WC Engineering, Mechanical SC Engineering GA LK088 UT WOS:A1993LK08800003 ER PT J AU OBOT, NT WAMBSGANSS, MW FRANCE, DM JENDRZEJCZYK, JA AF OBOT, NT WAMBSGANSS, MW FRANCE, DM JENDRZEJCZYK, JA TI CORRELATION OF ADIABATIC 2-PHASE PRESSURE-DROP DATA USING THE FRICTIONAL LAW OF CORRESPONDING STATES SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID FLOW; SMOOTH; CHANNELS; PASSAGES AB A method, based on that developed for single-phase flow, is proposed for the correlation of two-phase frictional pressure drop data. It is validated using air-water data obtained on small horizontal passages of rectangular and circular cross-section for values of total mass flux G in the 50-2000 kg/m2s range. The pressure drop for air- water mixtures can be predicted from the proposed correlations provided the critical quality (or superficial gas Reynolds number) and the critical pressure gradient for transition from bubble/plug-to-slug flow are known. A comparison of the proposed method with that of Lockhart and Martinelli is presented and discussed. RP OBOT, NT (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 25 TC 5 Z9 5 U1 0 U2 1 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 JUN PY 1993 VL 115 IS 2 BP 317 EP 323 DI 10.1115/1.2910141 PG 7 WC Engineering, Mechanical SC Engineering GA LK088 UT WOS:A1993LK08800022 ER PT J AU CADWALLADER, LC TAYLOR, GL AF CADWALLADER, LC TAYLOR, GL TI FAILURE RATE DATA FOR GLOVEBOX COMPONENTS AND CLEANUP SYSTEMS AT THE TRITIUM SYSTEMS TEST ASSEMBLY SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT International-Atomic-Energy-Agency Technical-Committee Meeting on Developments in Fusion Safety CY JUN 07-11, 1993 CL TORONTO, CANADA SP INT ATOM ENERGY AGCY DE FUSION; RELIABILITY; FAILURE RATES 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 data analysis of tritium glovebox confinement systems and an air detritiation system from the Tritium Systems Test Assembly (TSTA) at Los Alamos National Laboratory. These analyses benefit fusion design work by highlighting weak areas in designs to allow for modifications and upgrades, making future designs more robust. The TSTA results are generally smaller failure rates than the information from other industries, thus showing one of the benefits of gathering these fusion-specific data. RP CADWALLADER, LC (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. RI Cadwallader, Lee/F-6933-2014 NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1993 VL 12 IS 1-2 BP 47 EP 51 DI 10.1007/BF01059354 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MP887 UT WOS:A1993MP88700009 ER PT J AU LONGHURST, GR ANDERL, RA BARTLIT, JR CAUSEY, RA HAINES, JR AF LONGHURST, GR ANDERL, RA BARTLIT, JR CAUSEY, RA HAINES, JR TI USING THE TRITIUM PLASMA-EXPERIMENT TO EVALUATE ITER PFC SAFETY SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT International-Atomic-Energy-Agency Technical-Committee Meeting on Developments in Fusion Safety CY JUN 07-11, 1993 CL TORONTO, CANADA SP INT ATOM ENERGY AGCY DE TRITIUM; IMPLANTATION; EXPERIMENTS; SAFETY; ITER AB The Tritium Plasma Experiment was assembled at Sandia National Laboratories, Livermore and is being moved to the Tritium Systems Test Assembly facility at Los Alamos National Laboratory to investigate interactions between dense plasmas at low energies and plasma-facing component materials. This apparatus has the unique capabilty of replicating plasma conditions in a tokamak divertor with particle flux densities of 2 x 10(23) ions/m2.s and a plasma temperature of about 15 eV using a plasma that includes tritium. An experimental program has been initiated using the Tritium Plasma Experiment to examine safety issues related to tritium in plasma-facing components, particularly the ITER divertor. Those issues include tritium retention and release characteristics, tritium permeation rates and transient times to coolant streams, surface modification and erosion by the plasma, the effects of thermal loads and cycling, and particulate production. An industrial consortium led by McDonnell Douglas will design and fabricate the test fixtures. RP LONGHURST, GR (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1993 VL 12 IS 1-2 BP 115 EP 119 DI 10.1007/BF01059365 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MP887 UT WOS:A1993MP88700020 ER PT J AU RITTER, PD DOLAN, TJ LONGHURST, GR AF RITTER, PD DOLAN, TJ LONGHURST, GR TI TRITIUM ENVIRONMENTAL TRANSPORT STUDIES AT TFTR SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT International-Atomic-Energy-Agency Technical-Committee Meeting on Developments in Fusion Safety CY JUN 07-11, 1993 CL TORONTO, CANADA SP INT ATOM ENERGY AGCY DE TRITIUM; TRANSPORT; MONITORING; ENVIRONMENT; MODEL; VALIDATION AB Environmental tritium concentrations will be measured near the Tokamak Fusion Test Reactor (TFTR) to help validate dynamic models of tritium transport in the environment. For model validation the database must contain sequential measurements of tritium concentrations in key environmental compartments. Since complete containment of tritium is an operational goal, the supplementary monitoring program should be able to glean useful data from an unscheduled acute release. Portable air samplers will be used to take samples automatically every 4 hours for a week after an acute release, thus obtaining the time resolution needed for code validation. Samples of soil, vegetation, and foodstuffs will be gathered daily at the same locations as the active air monitors. The database may help validate the plant/soil/air part of tritium transport models and enhance environmental tritium transport understanding for the International Thermonuclear Experimental Reactor (ITER). RP RITTER, PD (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1993 VL 12 IS 1-2 BP 145 EP 148 DI 10.1007/BF01059370 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA MP887 UT WOS:A1993MP88700025 ER PT J AU GARY, SP WINSKE, D AF GARY, SP WINSKE, D TI SIMULATIONS OF ION-CYCLOTRON ANISOTROPY INSTABILITIES IN THE TERRESTRIAL MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; COLLISIONLESS SHOCKS; 2ND-ORDER THEORY; MIRROR WAVES; BETA AB Enhanced transverse magnetic fluctuations observed below the proton cyclotron frequency in the terrestrial magnetosheath have been identified as due to the proton cyclotron and helium cyclotron instabilities driven by the T(perpendicular-to) > T(parallel-to) condition of the sheath ions. One-dimensional hybrid computer simulations are used here to examine the nonlinear properties of these two growing modes at relatively weak fluctuation energies and for wave vectors parallel to the background magnetic field. Second-order theory predicts fluctuating magnetic field energies at saturation of the proton cyclotron anisotropy instability in semiquantitative agreement with the simulation results. In particular, introduction of the helium component enhances the wave-particle exchange rate for proton anisotropy reduction by that instability, thereby reducing the saturation energy of that mode. The simulations demonstrate that wave-particle interactions by the proton cyclotron and helium cyclotron instabilities lead to the anticorrelation of T(perpendicular-to p)/T(parallel-to p) and beta(parallel-to p) a result observed by Anderson and Fuselier (1993). RP GARY, SP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 31 TC 35 Z9 36 U1 1 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 JUN 1 PY 1993 VL 98 IS A6 BP 9171 EP 9179 DI 10.1029/93JA00272 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG058 UT WOS:A1993LG05800002 ER PT J AU KOZYRA, JU CHANDLER, MO HAMILTON, DC PETERSON, WK KLUMPAR, DM SLATER, DW BUONSANTO, MJ CARLSON, HC AF KOZYRA, JU CHANDLER, MO HAMILTON, DC PETERSON, WK KLUMPAR, DM SLATER, DW BUONSANTO, MJ CARLSON, HC TI THE ROLE OF RING CURRENT NOSE EVENTS IN PRODUCING STABLE AURORAL RED ARC INTENSIFICATIONS DURING THE MAIN PHASE - OBSERVATIONS DURING THE SEPTEMBER 19-24, 1984, EQUINOX TRANSITION STUDY SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INTERNATIONAL REFERENCE IONOSPHERE; ELECTRON-TEMPERATURE ENHANCEMENT; SOLAR-CYCLE; MILLSTONE HILL; MID-LATITUDES; STORM; PLASMASPHERE; PARTICLES; DENSITY; MODEL AB An examination of stable auroral red (SAR) arc emissions over the last solar cycle (Slater and Kleckner, 1989) indicates that the strongest emissions, during the lifetime of a particular SAR arc, often occur in association with the main phase of the magnetic storm. Previous observations of thermal and energetic particle populations at high and low altitudes on SAR arc field lines by Kozyra et al. (1987a) indicate that the energy source for these emissions is the O+ in the ring current. The O+ content of the ring current increases with increasing magnetic activity reaching its maximum percentage contribution near minimum Dst for a particular storm. This variation in the O+ content of the ring current is inconsistent with an early main phase enhancement of SAR arc emissions. To investigate the source of main phase enhancements in SAR arc emissions, a study of the September 19-24, 1984, magnetic storm period during which SAR arc emissions were observed by the ground-based mobile automatic scanning photometer network in both the main and recovery phases is presented. The emissions associated with the main phase (approximately 400 R) were an order of magnitude greater than those associated with the recovery phase (tens of R). Energetic particle measurements from the DE 1 and AMPTE spacecraft, on field lines that map to the SAR arc position at low altitude, were examined to determine if differences in the energy sources during these time periods were evident. In agreement with previous work, ring current O+ supplied the bulk of the electron heating during storm recovery phase as a result of Coulomb collisions of O+ with the plasmaspheric electrons; contributions by ring current H+ were negligible. A new result of the present work is that an enhancement of the 15-25 keV H+ component of the ring current during the main phase of the September 19 magnetic storm was responsible for an approximately one order of magnitude increase in the electron heating rate and SAR arc emissions during the main phase compared to the recovery phase. The increase in the H+ flux occurred in association with a ring current ''nose event'', a front of ions injected into the inner magnetosphere in response to a discontinuous change in the cross-tail electric field. The association between nose events and intensifications of SAR arc emissions in the main phase has not previously been explored but is a natural consequence of the injection of significant fluxes of relatively low-energy ring current ions earthward of the plasmapause during early storm time ring current formation. C1 MIT, HAYSTACK OBSERV, WESTFORD, MA 01886 USA. PHILIPS LAB, BEDFORD, MA 01731 USA. NASA, GEORGE C MARSHALL SPACE FLIGHT CTR, SPACE SCI LAB, HUNTSVILLE, AL 35812 USA. UNIV MARYLAND, DEPT PHYS & ASTRON, COLL PK, MD 20742 USA. LOCKHEED PALO ALTO RES LABS, DEPT 91-20, PALO ALTO, CA 94304 USA. PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. RP KOZYRA, JU (reprint author), UNIV MICHIGAN, DEPT ATMOSPHER OCEAN & SPACE SCI, SPACE PHYS RES LAB, ANN ARBOR, MI 48109 USA. RI Peterson, WK/A-8706-2009 OI Peterson, WK/0000-0002-1513-6096 NR 50 TC 19 Z9 19 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1993 VL 98 IS A6 BP 9267 EP 9283 DI 10.1029/92JA02554 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG058 UT WOS:A1993LG05800010 ER PT J AU CROOKER, NU SISCOE, GL SHODHAN, S WEBB, DF GOSLING, JT SMITH, EJ AF CROOKER, NU SISCOE, GL SHODHAN, S WEBB, DF GOSLING, JT SMITH, EJ TI MULTIPLE HELIOSPHERIC CURRENT SHEETS AND CORONAL STREAMER BELT DYNAMICS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLANETARY SECTOR BOUNDARIES; SOLAR-WIND; MAGNETIC CLOUDS; MASS EJECTIONS; 1-AU AB The occurrence of multiple directional discontinuities in the coronal streamer belt at sector boundary crossings in the heliosphere, often ascribed to waves or kinks in the heliospheric current sheet, may alternatively be attributed to a network of extended current sheets from multiple helmet streamers with a hierarchy of sizes at the base of the corona. Frequent transient outflows from these helmets can account for a variety of signatures observed at sector boundaries, including ordered field rotations, planar magnetic structure, and sandwichlike plasma structure. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. BOSTON UNIV,CTR SPACE PHYS,BOSTON,MA 02215. JET PROP LAB,PASADENA,CA 91109. PHILLIPS LAB,GPSG,BEDFORD,MA 01731. RP CROOKER, NU (reprint author), UNIV CALIF LOS ANGELES,DEPT ATMOSPHER SCI,LOS ANGELES,CA 90024, USA. NR 49 TC 127 Z9 129 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 JUN 1 PY 1993 VL 98 IS A6 BP 9371 EP 9381 DI 10.1029/93JA00636 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG058 UT WOS:A1993LG05800021 ER PT J AU NEUGEBAUER, M CLAY, DR GOSLING, JT AF NEUGEBAUER, M CLAY, DR GOSLING, JT TI THE ORIGINS OF PLANAR MAGNETIC-STRUCTURES IN THE SOLAR-WIND SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLANETARY SECTOR BOUNDARIES; EVENTS AB The term ''planar magnetic structure'' (PMS) refers to distinctive features in the solar wind characterized by a series of abrupt changes in the direction of the interplanetary field, with the field remaining nearly parallel to a single plane. Previous suggestions concerning the origin of PMS are (1) closed magnetic field loops arising from newly emerging, nearly parallel magnetic structures in the photosphere, (2) compression and draping of the field around a high-speed coronal mass ejection (CME), and (3) extended current sheets and/or loops from multiple helmet streamers in the corona. Four years of ISEE 3 data have been examined to establish a larger data base of PMS events and to allow a search for common features that may reveal the causes of these structures. A total of 33 PMS events were found and analyzed. The loop theory of PMS origins was tested by searching for a correlation between the PMSs and the electron or proton counterstreaming characteristic of closed loops or CMEs. It was found that the PMSs tended to precede rather than coincide with the CMEs. Fourteen of the PMS events (42%) were in the sheath between an interplanetary shock and a CME. Other PMS events were found to be related to crossings of the heliospheric current sheet (HCS). Sorting the events according to their association with either HCS or compression/draping ahead of fast streams (of which postshock sheaths are a subset) yields 19 events (58%) associated with compression/draping but not with HCS, 8 events (24%) associated with both compression/draping and HCS, 5 events (15%) associated with HCS but not with compression/draping, and 1 event (3%) associated with neither compression/draping nor the HCS. The conclusion is that planar magnetic structures are not closed loops of plasma from coronal mass ejections or helmet streamers. Instead, a process is postulated in which coronal mass ejections lead to the amplification and alignment of preexisting discontinuities in the ambient wind compressed by the CMEs. A possible cause of the alignment of discontinuities in the vicinity of the heliospheric current sheet is compression by lateral expansion of CMEs in the lower corona. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP NEUGEBAUER, M (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 19 TC 36 Z9 36 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1993 VL 98 IS A6 BP 9383 EP 9389 DI 10.1029/93JA00216 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG058 UT WOS:A1993LG05800022 ER PT J AU GRANDINETTI, PJ BALTISBERGER, JH LLOR, A LEE, YK WERNER, U EASTMAN, MA PINES, A AF GRANDINETTI, PJ BALTISBERGER, JH LLOR, A LEE, YK WERNER, U EASTMAN, MA PINES, A TI PURE-ABSORPTION-MODE LINESHAPES AND SENSITIVITY IN 2-DIMENSIONAL DYNAMIC-ANGLE SPINNING NMR SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Article ID O-17 NMR; SPECTROSCOPY; SPECTRA; SOLIDS; PHASE; NUCLEI C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP GRANDINETTI, PJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Grandinetti, Philip/F-1084-2010 OI Grandinetti, Philip/0000-0003-0102-316X NR 20 TC 110 Z9 110 U1 3 U2 11 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD JUN 1 PY 1993 VL 103 IS 1 BP 72 EP 81 DI 10.1006/jmra.1993.1132 PG 10 WC Physics, Atomic, Molecular & Chemical SC Physics GA LJ625 UT WOS:A1993LJ62500010 ER PT J AU FORDER, C ARMES, SP SIMPSON, AW MAGGIORE, C HAWLEY, M AF FORDER, C ARMES, SP SIMPSON, AW MAGGIORE, C HAWLEY, M TI PREPARATION AND CHARACTERIZATION OF SUPERPARAMAGNETIC CONDUCTIVE POLYESTER TEXTILE COMPOSITES SO JOURNAL OF MATERIALS CHEMISTRY LA English DT Article DE CONDUCTING POLYMER COMPOSITE; TEXTILE FIBER; SUPERPARAMAGNETIC MATERIAL; POLYPYRROLE; MAGNETITE ID POLYPYRROLE; POLYMERS; FERROFLUIDS; ALKALINE; MEDIA AB We describe the preparation of superparamagnetic-conductive textile composites by a facile, two-step solution deposition process. First, colloidal magnetite particles (5-20 nm diameter) are adsorbed spontaneously onto the textile fibres (polyester, nylon, cotton etc.) from an aqueous dispersion utilising a simple dip-coat procedure. Secondly, these treated fibres are then further coated with a conducting polymer overlayer (polypyrrole). We have characterised the resulting textile composites by a wide range of techniques, including gravimetry, surface resistance and magnetisation measurements, scanning electron microscopy, atomic absorption spectrometry, atomic force microscopy and Rutherford back-scattering spectrometry. C1 UNIV SUSSEX,SCH ENGN,BRIGHTON BN1 9QJ,E SUSSEX,ENGLAND. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. NR 34 TC 17 Z9 17 U1 1 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0959-9428 J9 J MATER CHEM JI J. Mater. Chem. PD JUN PY 1993 VL 3 IS 6 BP 563 EP 569 DI 10.1039/jm9930300563 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LG536 UT WOS:A1993LG53600002 ER PT J AU NASRELDIN, AM GHONEIM, MM HAMMAD, FH KLUEH, RL NANSTAD, RK AF NASRELDIN, AM GHONEIM, MM HAMMAD, FH KLUEH, RL NANSTAD, RK TI EFFECT OF TEMPERING ON THE TOUGHNESS OF A CR-MO BAINITIC STEEL SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE BAINITIC STEELS; CR-MO STEELS; TEMPERING; TOUGHNESS ID CLEAVAGE FRACTURE; YIELD STRESS; MICROSTRUCTURE; TRANSITION; ALLOYS AB The effect of tempering on impact and fracture toughness properties of a Cr-Mo bainitic steel was studied in the quenched and stress relieved (Q & SR) condition. The lowest tempering parameter used resulted in considerable improvement in impact properties. Further tempering increased the upper shelf energy, had a minor effect on the transition temperature, and increased both the initiation fracture toughness (J(IC)) and the tearing modulus (T). However, the effect on J(IC) and T was much greater than the effect on the impact upper shelf energy. The results were discussed in light of the changes in microstructure and flow properties due to tempering. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. RP NASRELDIN, AM (reprint author), ATOM ENERGY AUTHOR,CAIRO,EGYPT. NR 20 TC 5 Z9 5 U1 2 U2 5 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD JUN PY 1993 VL 2 IS 3 BP 413 EP 420 DI 10.1007/BF02648830 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA LK084 UT WOS:A1993LK08400013 ER PT J AU SHIELD, JE KRAMER, MJ MCCALLUM, RW AF SHIELD, JE KRAMER, MJ MCCALLUM, RW TI PLASTIC-DEFORMATION IN AN AL-CU-FE ICOSAHEDRAL ALLOY SO JOURNAL OF MATERIALS RESEARCH LA English DT Note AB Al-Cu-Fe quasicrystalline alloys have been deformed by high-temperature creep between 680 and 740-degrees-C. Deformations greater than 30% were achieved without cracking. Analysis of the data in the quasi-steady state regime reveals power law behavior with a stress exponent of 2.5. The activation energy for deformation was determined to be 640 +/- 20 kJ/mole in the temperature region investigated. Transmission electron microscopy revealed lamellar defects which appear similar to twins. RP SHIELD, JE (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 12 TC 25 Z9 25 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1993 VL 8 IS 6 BP 1199 EP 1202 DI 10.1557/JMR.1993.1199 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA LE828 UT WOS:A1993LE82800001 ER PT J AU KESTER, DJ AILEY, KS DAVIS, RF MORE, KL AF KESTER, DJ AILEY, KS DAVIS, RF MORE, KL TI PHASE EVOLUTION IN BORON-NITRIDE THIN-FILMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Note AB Boron nitride (BN) thin films were deposited on monocrystalline Si(100) wafers using electron beam evaporation of boron with simultaneous bombardment by nitrogen and argon ions. The effect of film thickness on the resultant BN phase was investigated using Fourier transform infrared (FTIR) spectroscopy and high resolution transmission electron microscopy (HRTEM). These techniques revealed the consecutive deposition of an initial 20 angstrom thick layer of amorphous BN, 20-50 angstrom of hexagonal BN having a layered structure, and a final layer of the polycrystalline cubic phase. The growth sequence of the layers is believed to result primarily from increasing biaxial compressive stresses. Favorable surface and interface energy and crystallographic relationships may also assist in the nucleation of the cubic and the hexagonal phases, respectively. The presence of the amorphous and hexagonal regions explains why there have been no reports of the growth of 100% cubic boron nitride on Si. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP KESTER, DJ (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695, USA. RI Davis, Robert/A-9376-2011; More, Karren/A-8097-2016 OI Davis, Robert/0000-0002-4437-0885; More, Karren/0000-0001-5223-9097 NR 15 TC 183 Z9 183 U1 2 U2 21 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 JUN PY 1993 VL 8 IS 6 BP 1213 EP 1216 DI 10.1557/JMR.1993.1213 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA LE828 UT WOS:A1993LE82800005 ER PT J AU SINGH, JP JOO, J SINGH, D WARZYNSKI, T POEPPEL, RB AF SINGH, JP JOO, J SINGH, D WARZYNSKI, T POEPPEL, RB TI EFFECTS OF SILVER ADDITIONS ON RESISTANCE TO THERMAL-SHOCK AND DELAYED FAILURE OF YBA2CU3O7-DELTA SUPERCONDUCTORS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB The effect of silver (Ag) addition on the resistance to thermal shock and delayed failure of YBa2Cu3O7-delta superconducting wires has been evaluated. Resistance to thermal shock was evaluated by measuring the critical-current density (J(c)) as a function of the number of thermal cycles for YBCO and its composites with 15 vol. % Ag additions. Composite YBCO-Ag wires show a slower decrease in J(c) than does monolithic YBCO as the number of thermal cycles increases. The nature of delayed failure was studied by measuring strength (sigma(f)) as a function of loading rate (sigma) and evaluating the value of the subcritical crack growth parameter N[sigma(f) = Asigma1/(N+1)]. The value of the N parameter was observed to increase slightly from 35 for YBCO to 41 for YBCO-Ag composites. The improved resistance to thermal shock and subcritical crack growth is believed to be due to improvements in mechanical properties (strength and fracture toughness) and thermal conductivity of YBCO as a result of Ag addition. RP SINGH, JP (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 25 TC 31 Z9 31 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1993 VL 8 IS 6 BP 1226 EP 1231 DI 10.1557/JMR.1993.1226 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA LE828 UT WOS:A1993LE82800008 ER PT J AU ARRASMITH, SR KRAMER, MJ MERKLE, BD HOLESINGER, TG MCCALLUM, RW AF ARRASMITH, SR KRAMER, MJ MERKLE, BD HOLESINGER, TG MCCALLUM, RW TI RAPIDLY TEXTURED BI2SR2CACU2O8 SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CU-O SYSTEM; SUPERCONDUCTING GLASS-CERAMICS; CRITICAL CURRENT-DENSITY; AMORPHOUS FILMS; BI; TC; CRYSTALLIZATION; PHASE; ANISOTROPY; MAGNETIZATION AB Amorphous Bi2Sr2CaCu2O8 (Bi-2212) was crystallized under uniaxial loads (up to 1500 N) at temperatures up to 890-degrees-C to induce texture. Well-textured samples (19 mm in diameter and 0.15 mm thick) were obtained for samples heated to 890-degrees-C and quenched. Heated (10-degrees-C/min) and quenched samples at 550, 750, 850, and 870-degrees-C demonstrate that the crystallization path is Bi2Sr2CuO6 (Bi-2201) (550-degrees-C) to Bi-2212 (850-degrees-C), with texturing occurring during grain growth (T > 850-degrees-C). Comparison of samples crystallized under load and no load demonstrates that the texturing is a result of the plane stress biasing the normal anisotropic grain growth normal to the applied stress direction. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP ARRASMITH, SR (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 41 TC 13 Z9 13 U1 1 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1993 VL 8 IS 6 BP 1247 EP 1257 DI 10.1557/JMR.1993.1247 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA LE828 UT WOS:A1993LE82800011 ER PT J AU ITOH, K HANSEN, WL HALLER, EE FARMER, JW OZHOGIN, VI RUDNEV, A TIKHOMIROV, A AF ITOH, K HANSEN, WL HALLER, EE FARMER, JW OZHOGIN, VI RUDNEV, A TIKHOMIROV, A TI HIGH-PURITY ISOTOPICALLY ENRICHED GE-70 AND GE-74 SINGLE-CRYSTALS - ISOTOPE-SEPARATION, GROWTH, AND PROPERTIES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID DIAMOND; GERMANIUM AB Ge-70 and Ge-74 isotopes were successfully separated from natural Ge and zone purified. Several highly enriched, high purity Ge-70 and Ge-74 single crystals were grown by the vertical Bridgman method. The growth system was designed for reliable growth of low dislocation density, high purity Ge single crystals of very small weight (approximately 4 g). A Ge-70 and a Ge-74 crystal were selected for complete characterization. In spite of the large surface to volume ratio of these ingots, both Ge-70 and Ge-74 crystals contain low electrically active chemical net-impurity concentrations of approximately 2 X 10(12) cm-3, which is two orders of magnitude better than that of Ge-71 crystals previously grown by two different groups.1,2 Isotopic enrichment of the Ge-70 and the Ge-74 crystals is 96.3% and 96.8%, respectively. The residual donors and acceptors present in both crystals were identified as phosphorus and copper, respectively. In addition, less than 10(11) cm-3 gallium, aluminum, and indium were found in the Ge-70 crystal. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MISSOURI,COLUMBIA,MO 65211. KURCHATOV INST,RUSSIAN SCI CTR,MOSCOW 123182,RUSSIA. RP ITOH, K (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. RI Itoh, Kohei/C-5738-2014 NR 26 TC 49 Z9 49 U1 1 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1993 VL 8 IS 6 BP 1341 EP 1347 DI 10.1557/JMR.1993.1341 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA LE828 UT WOS:A1993LE82800022 ER PT J AU MAIYA, PS RUSSELL, R POA, DS WAGH, AS POEPPEL, RB AF MAIYA, PS RUSSELL, R POA, DS WAGH, AS POEPPEL, RB TI MICROSTRUCTURAL CHARACTERIZATION, MECHANICAL-PROPERTIES, AND CORROSION-RESISTANCE OF THE CAO-TIO2 SYSTEM SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB Ceramic materials with chemical compositions of CaO-X mole % TiO2, where X ranges from 3 to 40, have been prepared for the evaluation of microstructures, mechanical properties, thermal shock resistance, resistance to hydration in air, and resistance to corrosion in molten salt saturated with calcium. When the TiO2 content is less than 40.3 mole %, the CaO forms two-phase microstructures consisting of CaO and Ca3Ti2O7, and the composition CaO-40.3 mole % TiO2 corresponds to the (single-phase) compound Ca3Ti2O7. The data on mechanical properties suggest that the single-phase material has better flexural strength and fracture toughness than do the two-phase materials. It is also demonstrated that the stabilizing effect of TiO2 on CaO imparts resistance to atmospheric hydration. Both scanning electron microscopy and energy-dispersive x-ray analysis of the specimens exposed to molten CaCl2-20 mole % CaF2 saturated with calcium at 900-degrees-C show that corrosion resistance increases with an increase in TiO2 content, but that corrosion does occur in all materials. On the basis of experimental observations and thermodynamic considerations, the degradation of Ca3Ti2O7 is shown to be associated with the reduction of Ca3Ti2O7 by calcium to form CaO and metallic titanium followed by the dissolution of the reaction product CaO in the molten salt. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. RP MAIYA, PS (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. OI Wagh, Arun/0000-0002-8678-7574 NR 11 TC 6 Z9 6 U1 0 U2 4 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 JUN PY 1993 VL 8 IS 6 BP 1387 EP 1393 DI 10.1557/JMR.1993.1387 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA LE828 UT WOS:A1993LE82800029 ER PT J AU DUNBAR, E THADHANI, NN GRAHAM, RA AF DUNBAR, E THADHANI, NN GRAHAM, RA TI HIGH-PRESSURE SHOCK ACTIVATION AND MIXING OF NICKEL-ALUMINUM POWDER MIXTURES SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ZINC FERRITE AB The adiabatic chemical reaction behaviour of shock-compressed Ni-Al powder mixtures of varying morphology and different volumetric distributions has been investigated by microstructural and differential thermal analysis (DTA) to understand the mechanistic changes responsible for chemical reactions occurring during shock treatment. Mechanically mixed Ni-Al powders undergo exothermic chemical reactions at temperatures close to the melt-temperature of Al. In contrast, shock-treated Ni-Al powder mixtures exhibit a ''pre-initiation'' exothermic event, before the main exothermic reaction. Different forms (reaction start and peak temperatures) of the preinitiation exotherm are observed depending on the degree of macroscopic mixing, contact intimacy and activation, accomplished during shock compression of the powder mixtures of different morphology and volumetric distribution, all shock-treated under the same conditions. Mixtures containing equimolar volumetric distribution of powders of more irregular (flaky) morphologies undergo a significant extent of configuration change during shock-compression, resulting in the formation of an activated, intimately mixed and close-packed state. In such a state, chemical reaction is readily initiated by external thermal stimulation, such as heating during DTA. In fact, a greater degree of configuration change, activation and more intense mixing occurring during shock-compression can even lead to reaction initiation and completion in the shock duration itself. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP DUNBAR, E (reprint author), CTR EXPLOS TECHNOL RES,SOCORRO,NM 87801, USA. NR 24 TC 34 Z9 34 U1 0 U2 5 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUN 1 PY 1993 VL 28 IS 11 BP 2903 EP 2914 DI 10.1007/BF00354693 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA LH255 UT WOS:A1993LH25500005 ER PT J AU GUHR, T AF GUHR, T TI FOURIER-BESSEL ANALYSIS FOR ORDINARY AND GRADED 2X2 HERMITIAN MATRICES SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID GAUSSIAN ENSEMBLES; SUPERSYMMETRY; SCATTERING AB Chainlike integrals in matrix spaces play an important part in high-energy and solid-state physics and in general random matrix theory. In the special case of ordinary and graded 2 X 2 Hermitian matrices, a method is proposed to integrate out all angular variables. The essence of this method is a Fourier-Bessel analysis in these matrix spaces which is formulated in this paper. Close formal similarities are found between the ordinary and the graded case. The main differences arise from the fact that the ordinary case can be reduced to the study of a vector space whereas no analogous feature is present in the graded case. RP GUHR, T (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 20 TC 10 Z9 10 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD JUN PY 1993 VL 34 IS 6 BP 2523 EP 2540 DI 10.1063/1.530135 PG 18 WC Physics, Mathematical SC Physics GA LF362 UT WOS:A1993LF36200032 ER PT J AU GUHR, T AF GUHR, T TI ON THE GRADED GROUP U(1/1) SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article AB A noncanonical parametrization for the graded group U(1/1) is introduced similar to the Euler angles for the ordinary group SU(2). Two differential representations for the underlying algebra of U(1/1) are constructed on the full and the restricted, i.e., coset, parameter space, respectively. A space of functions living on the latter is found exhibiting close formal similarities to a Hilbert space. Remarkably, the indices of those functions and thus the orthogonality and completeness relations involve anticommuting variables. Using this Hilbert space a representation of U(1/1) is evaluated which shows analogies to the Wigner functions for SU(2). RP GUHR, T (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 8 TC 13 Z9 13 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD JUN PY 1993 VL 34 IS 6 BP 2541 EP 2553 DI 10.1063/1.530406 PG 13 WC Physics, Mathematical SC Physics GA LF362 UT WOS:A1993LF36200033 ER PT J AU SALES, BC CHAKOUMAKOS, BC BOATNER, LA RAMEY, JO AF SALES, BC CHAKOUMAKOS, BC BOATNER, LA RAMEY, JO TI STRUCTURAL-PROPERTIES OF THE AMORPHOUS PHASES PRODUCED BY HEATING CRYSTALLINE MGHPO4.3H2O SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID LEAD PYROPHOSPHATE; LIQUID-CHROMATOGRAPHY; PHOSPHATE-GLASSES; VITRIFICATION; STATE AB The crystalline phosphate MgHPO4.3H2O (newberyite) undergoes an unusual crystalline-to-amorphous transition when heated. The structural alterations associated with this transition have been investigated using high-performance liquid chromatography (HPLC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The dehydration of newberyite on heating results in amorphous XRD patterns that remain essentially unchanged over the interval between 150 and 600-degrees-C. Over the same temperature interval, however, HPLC results reveal a dramatic continuous evolution in the distribution of phosphate chains of comer-linked PO4 tetrahedra leading to the formation of chains up to 13 PO4 tetrahedra in length. Above 600-degrees-C, crystalline Mg2P2O7 is formed. At each annealing temperature in the interval from 150 to 600-degrees-C, the measured distribution of phosphate anions is in quantitative agreement with theory. During the dehydration-induced crystalline-to-amorphous transition, the original faceted crystal shape is preserved even though the crystals lose up to 36% of their original weight. High-pressure DSC experiments in which the waters of hydration were retained in the specimens during heating resulted in the formation of a unique new crystalline phosphate phase that contained equal amounts of orthophosphate and pyrophosphate anions. The results of HPLC, DSC, and XRD measurements on CaHPO4.2H2O, SrHPO4, and BaHPO4 are also reported. RP SALES, BC (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,BLDG 2000,MS 6056,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016; Boatner, Lynn/I-6428-2013 OI Chakoumakos, Bryan/0000-0002-7870-6543; Boatner, Lynn/0000-0002-0235-7594 NR 34 TC 17 Z9 18 U1 0 U2 10 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 JUN PY 1993 VL 159 IS 1-2 BP 121 EP 139 DI 10.1016/0022-3093(93)91289-F PG 19 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LG578 UT WOS:A1993LG57800013 ER PT J AU WEBER, DA FRANCESCHI, D IVANOVIC, M ATKINS, HL CABAHUG, C WONG, CTC SUSSKIND, H AF WEBER, DA FRANCESCHI, D IVANOVIC, M ATKINS, HL CABAHUG, C WONG, CTC SUSSKIND, H TI SPECT AND PLANAR BRAIN IMAGING IN CRACK ABUSE - IODINE-123-IODOAMPHETAMINE UPTAKE AND LOCALIZATION SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID CEREBRAL BLOOD-FLOW; COCAINE ABUSE; EMISSION TOMOGRAPHY; COMPUTED-TOMOGRAPHY; COMPLICATIONS; LUNG; IODOAMPHETAMINE; STIMULANTS; PERFUSION; CLEARANCE AB The uptake, distribution, and clearance properties of I-123-IMP in the brain were evaluated in controls and asymptomatic crack users to investigate cerebral blood flow alterations in crack abuse. Serial dynamic planar images of the brain (0-25 min), SPECT of the brain (0.5 hr and 4 hr) and whole-body scans (75 min) were obtained in 21 crack abusers and 21 control subjects. Major observations include: (a) foci of abnormally reduced I-123-IMP activity mainly in the frontal and parieto-occipital cortex or marked irregularities in the uptake of I-123-IMP throughout the cerebral cortex consistent with moderate to severe disruption in regional cerebral blood flow were observed on the 0.5 hr SPECT images of 16/21 asymptomatic crack users; (b) no correlation could be demonstrated between the incidence or severity of SPECT perfusion abnormality with the frequency, amount or length of time of crack use; (c) focal perfusion defects observed in 6/21 crack users on the 0.5-hr SPECT images partially or completely filled-in on delayed SPECT at 4 hr in four of six subjects; (d) the rate of cerebral uptake of I-123-IMP in crack users averaged 23% less than observed in control subjects over the first 25 min after tracer administration; and (e) I-123-IMP activity reaching the brain of cigarette smoking control subjects (n = 14) at 25 min after injection averaged 42.5% less than in nonsmoking controls (n = 7). Quantitative measurements of the uptake and distribution properties of I-123-IMP in the brain proved to be an objective, sensitive and useful measure of regional cerebral blood flow in crack abuse. C1 SUNY,HLTH SCI CTR,DEPT RADIOL,STONY BROOK,NY 11794. RP WEBER, DA (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 30 TC 35 Z9 35 U1 2 U2 4 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD JUN PY 1993 VL 34 IS 6 BP 899 EP 907 PG 9 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LG085 UT WOS:A1993LG08500016 PM 8509856 ER PT J AU BREITZ, HB FISHER, DR WEIDEN, PL DURHAM, JS RATLIFF, BA BJORN, MJ BEAUMIER, PL ABRAMS, PG AF BREITZ, HB FISHER, DR WEIDEN, PL DURHAM, JS RATLIFF, BA BJORN, MJ BEAUMIER, PL ABRAMS, PG TI DOSIMETRY OF RHENIUM-186-LABELED MONOCLONAL-ANTIBODIES - METHODS, PREDICTION FROM TC-99M-LABELED ANTIBODIES AND RESULTS OF PHASE-I TRIALS SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID THERAPY; TUMOR; RADIOIMMUNOTHERAPY; FRAGMENTS; HEPATOMA; LYMPHOMA; ANTIGENS; CANCER; MARROW; MODEL AB Rhenium-1 86 is a beta-emitting radionuclide that has been studied for applications in radioimmunotherapy. Its 137 keV gamma photon is ideal for imaging the biodistribution of the immunoconjugates and for obtaining gamma camera data for estimation of dosimetry. Methods used for determining radiation absorbed dose are described. We have estimated absorbed dose to normal organs and tumors following administration of two different Re-186-labeled immunoconjugates, intact NR-LU-10 antibody and the F(ab')2 fragment of N R-CO-02. Tumor dose estimates in 46 patients varied over a wide range, 0.4-18.6 rads/mCi, but were similar in both studies. Accuracy of activity estimates in superficial tumors was confirmed by biopsy. Prediction of Re-186 dosimetry from a prior Tc-99m imaging study using a tracer dose of antibody was attempted in the NR-CO-02 (Fab')2 study. Although Tc-99m was an accurate predictor of tumor localization and the mean predicted and observed radiation absorbed doses to normal organs compared favorably, Re-186 dosimetry could not be reliably predicted in individual patients. The methods described nevertheless provide adequate estimates of Re-186 dosimetry to tumor and normal organs. C1 VIRGINIA MASON MED CTR, DEPT MED, SEATTLE, WA 98101 USA. NEORX CORP, SEATTLE, WA USA. PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA 99352 USA. RP BREITZ, HB (reprint author), VIRGINIA MASON MED CTR, DEPT RADIOL, 1100 9TH AVE, POB 900, C5-NM, SEATTLE, WA 98111 USA. NR 38 TC 42 Z9 46 U1 0 U2 1 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD JUN PY 1993 VL 34 IS 6 BP 908 EP 917 PG 10 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LG085 UT WOS:A1993LG08500017 PM 8509857 ER PT J AU KNAPP, FF KROPP, J MCPHERSON, DW AMBROSE, KR LAMBERT, CR CALLAHAN, AP KIRSCH, G BIERSACK, HJ AF KNAPP, FF KROPP, J MCPHERSON, DW AMBROSE, KR LAMBERT, CR CALLAHAN, AP KIRSCH, G BIERSACK, HJ TI SITE-SPECIFIC STABLE RADIOIODINATION OF 1,2-PAL-3-IPPA - AN AGENT FOR THE POTENTIAL CLINICAL-EVALUATION OF PANCREATIC INSUFFICIENCY BY URINE ANALYSIS SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID ACIDS; METABOLISM AB To measure pancreatic lipase activity, we synthesized a triglyceride containing a radioiodinated fatty acid. The urinary excretion of radioactivity was measured in five rats following administration of the agent by feeding tube. We attached 15-phenylpentadecanoic acid (PPA) to position-3 of 1,2-dipalmitoyl-rac-glycerol (1,2-Pal) to form 1,2-Pal-3-PPA. The 1,2-Pal-3-IPPA (expected lipase substrate) was prepared by the thallation-iodide displacement method. In a dual-label study, the I-125-1,2-Pal-3-IPPA triglyceride was administered with the I-125-IPPA free acid to rats (n = 5) by oral gavage. Urine and feces were collected daily and the tissue distribution of both tracers was evaluated over a five-day period. A significant portion of the administered activity was excreted in 24 hr in the urine (I-125 30.31% + 4.32%; I-131, 35.0% + 7.290%), which cochromatographed with hippuric acid by thin layer chromatography. Release of the acidic components from the conjugated excretory products by acid hydrolysis of the urine provided the radioactive acidic metabolites. Analysis of the Folch extracts of fat samples demonstrated that the radioactive components cochromatographed in the triglyceride region. This agent appears useful for the evaluation of various gastrointestinal diseases. C1 UNIV BONN,NUCL MED CLIN,W-5300 BONN,GERMANY. RP KNAPP, FF (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,NUCL MED GRP,BLDG 3047,POB 2008,OAK RIDGE,TN 37831, USA. NR 32 TC 2 Z9 2 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD JUN PY 1993 VL 34 IS 6 BP 946 EP 952 PG 7 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LG085 UT WOS:A1993LG08500023 PM 8509862 ER PT J AU ROCSKAY, AZ ROBINS, TG SCHORK, MA ECHEVERRIA, D PROCTOR, SP WHITE, RF AF ROCSKAY, AZ ROBINS, TG SCHORK, MA ECHEVERRIA, D PROCTOR, SP WHITE, RF TI RENAL EFFECTS OF NAPHTHA EXPOSURE AMONG AUTOMOTIVE WORKERS SO JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL MEDICINE LA English DT Article ID PETROLEUM HYDROCARBON TOXICITY; URINARY; SOLVENT; VAPORS AB As part of a study on health effects of naphtha exposure, the association between naphtha exposure and urinary excretion of total protein, albumin, beta-N-acetyl-D-glucosaminidase (beta-NAG), and beta2-Microglobulin was assessed prospectively over 1 year among workers at an automotive plant that used naphtha to calibrate fuel injectors. Participants consisted of 248 workers who provided spot urine samples in June 1988 among whom 181 workers provided specimens again in June 1989. Naphtha air concentrations at the plant ranged from 6 to 790 mg/m3 and the length of exposure ranged from 0.8 to 7.3 years. In both 1988 and 1989, the overall distribution of the four measures of renal function appeared consistent with that of an unexposed population. In cross-sectional analyses, there were no statistically significant associations in the expected direction between cumulative or recent naphtha exposure and the measures of renal function. In longitudinal analyses, the change in beta-NAG was positively associated with the change in recent naphtha exposure (P = .009). The effect of the naphtha exposure during 1 workweek was assessed among 17 workers who provided urine samples Monday preshift, Monday postshift, and Friday postshift. No associations were found. The results of this study do not provide strong evidence of naphtha-associated renal effects at these levels of exposure. C1 UNIV MICHIGAN,SCH PUBL HLTH,DEPT ENVIRONM & IND HLTH,ANN ARBOR,MI 48109. BATTELLE SEATTLE RES CTR,SEATTLE,WA. BOSTON UNIV,DEPT NEUROL,BOSTON,MA 02215. UNIV MICHIGAN,SCH PUBL HLTH,DEPT BIOSTAT,ANN ARBOR,MI 48109. NR 20 TC 3 Z9 3 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1076-2752 J9 J OCCUP ENVIRON MED JI J. Occup. Environ. Med. PD JUN PY 1993 VL 35 IS 6 BP 617 EP 622 DI 10.1097/00043764-199306000-00020 PG 6 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA LG735 UT WOS:A1993LG73500016 PM 8331444 ER PT J AU JOHNSON, JN AF JOHNSON, JN TI ELASTIC-MODULI AS DETERMINED BY SHOCK-RELEASE EXPERIMENTS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE SHOCK COMPRESSION; ELASTIC MODULI; DISLOCATIONS; ANELASTICITY; VISCOUS DRAG ID COMPRESSED STATE AB The relationship between release-wave velocity and longitudinal elastic modulus in the state following shock compression is examined. The shocked state is characterized by the density of pinned dislocation segments, their pinning separation, and the viscous drag coefficient, in addition to lattice strains representing volumetric and deviatoric stress components. Release from the shock-compressed state is similar to ultrasonic-wave propagation in metals containing pinned dislocation segments. The exceptions are that release-wave amplitudes are greater, dislocation displacement is larger (the restoring force is nonlinear), and frequency content of the release waves is broader. For FCC metals, in which the Peierls stress is low and provides little lattice resistance to dislocation motion, dislocation segments can undergo motion at low applied stress and thus contribute to anelastic deformation unless the driving frequency is very high or special precautions are taken to pin them by various point defects. It is well known that, without such precautions, the ultrasonically determined modulus can be much lower than the true elastic modulus of the crystal lattice. Shock compression can create dislocation segments of density approximately 10(9)-10(10) cm-2 and pinning separation of 500 b. For materials with viscous drag coefficients on the order of 1-100 x 10(-3) dyne s cm-2 in the shock-compressed state, the influence of shock-wave-generated dislocation segments is to reduce the effective elastic modulus and thus reduce the observable release-wave speed. This is due to the very short time scale for reverse dislocation motion making ideally elastic deformation unobservable in any practical sense. As a consequence, the modulus based on the release-wave speed in an FCC metal serves only as a lower limit to the fully elastic modulus in the shock-compressed state. RP JOHNSON, JN (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 18 TC 6 Z9 7 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 JUN PY 1993 VL 54 IS 6 BP 691 EP 699 DI 10.1016/0022-3697(93)90129-F PG 9 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA LG390 UT WOS:A1993LG39000004 ER PT J AU THORN, RJ AF THORN, RJ TI THE ROLE OF HYDROSTATIC-PRESSURE IN THE CONDUCTIVITY VS TEMPERATURE OF KAPPA-(BEDT-TTF)2CUN(CN)2BR SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE CONDUCTIVITY; KAPPA-(BEDT-TTF)2CUN(CN)2BR; HYDROSTATIC PRESSURE; MIXED VALENCE ID ORGANIC SUPERCONDUCTORS; BEDT-TTF; TC; YBA2CU3O7-DELTA; COMPONENTS; SALTS AB The application of hydrostatic pressure to kappa-(BEDT-TTF)2CuN(CN)2Br causes the resistance vs temperature to change, in a systematic way, from an R(T), with a maximum, to an R(T) which increases monotonically as occurs with a metal [Sushko Yu. V.. Bondarenko V. A., Petrosov R. A., Kushch N. D. and Yagubskii E. B., J. Phys. I France 1, 1375 (1991)]. This systematic variation can be interpreted in terms of two models: (1) a phenomenological one in which the density of states is zero between the Fermi energy and the energy at the bottom of the valence band and is constant otherwise; and (2) the small polaron model of Holstein [Holstein T., Ann. Phys, 8, 325, 342 (1959)]. The results show that the primary feature associated with the systematic variation is the chemical potential of the electron involved in chemical equilibria among mixed valent cations and anions: C(c+)A(a-) = C((c-1)+)A((a-1)-). C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP THORN, RJ (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 35 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD JUN PY 1993 VL 54 IS 6 BP 711 EP 716 DI 10.1016/0022-3697(93)90131-A PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA LG390 UT WOS:A1993LG39000006 ER PT J AU ASCIOTI, FA BELTRAMI, E CARROLL, TO WIRICK, C AF ASCIOTI, FA BELTRAMI, E CARROLL, TO WIRICK, C TI IS THERE CHAOS IN PLANKTON DYNAMICS SO JOURNAL OF PLANKTON RESEARCH LA English DT Article ID STRANGE ATTRACTORS; TIME-SERIES; MODEL; ERROR; IF AB A controversial issue in ecosystem modeling is whether the irregular fluctuations that one observes in nature are due solely to random environmental factors or whether, at least partially, a deterministic mechanism is responsible for the unpredictable behavior. This second alternative is called deterministic chaos and the issue in this paper is to decide if actual plankton time series can vindicate the hypothesis of chaotic dynamics. The near-neighbor forecasting method is a recent technique for detecting determinism in a time series and we apply it to measurements of phytoplankton and zooplankton biomass obtained at a single station in the Middle Atlantic Bight. Although the results do not conclude the presence of chaos, they do give some support to the idea that deterministic non-linear trophic dynamics may account for at least some of the variability that is seen in the data, particularly in terms of inferring zooplankton oscillations from those of phytoplankton. C1 BROOKHAVEN NATL LAB,DIV OCEANOG SCI,UPTON,NY 11973. CNR,IMAAA,I-8050 TITO SCALO,ITALY. SUNY,DEPT APPL MATH & STAT,STONY BROOK,NY 11794. SUNY,MARINE SCI RES CTR,STONY BROOK,NY 11794. SUNY,INST PATTERN RECOGNIT,STONY BROOK,NY 11794. SUNY,HARRIMAN SCH MANAGEMENT,STONY BROOK,NY 11794. RP ASCIOTI, FA (reprint author), WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543, USA. NR 23 TC 38 Z9 40 U1 0 U2 2 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0142-7873 J9 J PLANKTON RES JI J. Plankton Res. PD JUN PY 1993 VL 15 IS 6 BP 603 EP 617 DI 10.1093/plankt/15.6.603 PG 15 WC Marine & Freshwater Biology; Oceanography SC Marine & Freshwater Biology; Oceanography GA LH495 UT WOS:A1993LH49500002 ER PT J AU MURAISO, C MUDGETT, JS MATSUDAIRA, H STRNISTE, GF AF MURAISO, C MUDGETT, JS MATSUDAIRA, H STRNISTE, GF TI A SHUTTLE VECTOR SYSTEM FOR STUDYING IONIZING RADIATION-INDUCED MUTAGENESIS IN MAMMALIAN-CELLS SO JOURNAL OF RADIATION RESEARCH LA English DT Article DE SHUTTLE VECTOR; GAMMA-IRRADIATION; MUTATION; COS-1; HB101 ID HOMOLOGOUS RECOMBINATION; DNA; PLASMIDS; MUTANTS; DAMAGE; GENE AB A shuttle vector system was developed to quantitate and analyze ionizing radiation-induced mutation in mammalian host cells, COS-1 and CV-1. The shuttle vector pSV2-lacY, which was constructed to detect both point mutations and deletions, was irradiated in vitro with Co-60 gamma rays before introduction into unirradiated host cells. The plasmid was then isolated and reintroduced into HB101 (lacY-) bacterial host cells for identification of mutated lacY marker genes. Gamma-irradiation produced a decrease of the survival (recovery) and an increase of mutation of the shuttle vector. The mutated shuttle vector molecules were examined for structural changes by means of restriction endonuclease digestion and agarose gel electrophoresis. A dose dependent increase was observed in the percentages of gross alteration events of total mutations in mammalian host. This system will be useful for studies of ionizing radiation-induced mutagenesis. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,GENET GRP,LOS ALAMOS,NM 87545. RP MURAISO, C (reprint author), NATL INST RADIOL SCI,DIV BIOL,9-1 ANAGAWA 4 CHOME,INAGE KU,CHIBA 263,JAPAN. NR 13 TC 0 Z9 0 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 JUN PY 1993 VL 34 IS 2 BP 148 EP 156 DI 10.1269/jrr.34.148 PG 9 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA LL405 UT WOS:A1993LL40500002 PM 8360857 ER PT J AU SEABORG, GT AF SEABORG, GT TI AN OVERVIEW OF THE TEACHING OF NUCLEAR CHEMISTRY - INTRODUCTION SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Editorial Material RP SEABORG, GT (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 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 JUN PY 1993 VL 171 IS 1 BP 7 EP 14 DI 10.1007/BF02039665 PG 8 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA LN104 UT WOS:A1993LN10400002 ER PT J AU GOSLING, FG AF GOSLING, FG TI SHATTERED NERVES - DOCTORS, PATIENTS, AND DEPRESSION IN VICTORIAN ENGLAND - OPPENHEIM,J SO JOURNAL OF SOCIAL HISTORY LA English DT Book Review RP GOSLING, FG (reprint author), US DOE,WASHINGTON,DC 20545, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CARNEGIE MELLON UNIV PRESS PI PITTSBURGH PA CARNEGIE MELLON UNIV J SOCIAL HIST, PITTSBURGH, PA 15213 SN 0022-4529 J9 J SOC HIST JI J. Soc. Hist. PD SUM PY 1993 VL 26 IS 4 BP 863 EP 864 PG 2 WC History SC History GA LF977 UT WOS:A1993LF97700008 ER PT J AU ROGL, P RUPP, B FELNER, I FISCHER, P AF ROGL, P RUPP, B FELNER, I FISCHER, P TI CRYSTAL-CHEMISTRY AND MAGNETISM OF TERNARY ACTINOID BORON CARBIDES UB1-XC1+X AND U1-XMXB2C WITH M = SC, LU, AND TH SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID X-RAY-ABSORPTION; POWDER NEUTRON-DIFFRACTION; RARE-EARTH; PLATINUM C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. SWISS FED INST TECHNOL,NEUTRONENSTREUUNG LAB,CH-8092 ZURICH,SWITZERLAND. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RP ROGL, P (reprint author), UNIV VIENNA,INST PHYS CHEM,WAHRINGERSTR 42,A-1090 VIENNA,AUSTRIA. NR 20 TC 11 Z9 11 U1 0 U2 5 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 JUN PY 1993 VL 104 IS 2 BP 377 EP 390 DI 10.1006/jssc.1993.1173 PG 14 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA LK501 UT WOS:A1993LK50100024 ER PT J AU MARSHALL, WL AF MARSHALL, WL TI VOLUME, ELECTROSTRICTION, AND SOLVATION RELATIONS ALONG THE LIQUID-VAPOR CRITICAL CURVE OF AQUEOUS SODIUM-CHLORIDE SOLUTIONS SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE CRITICAL DENSITIES; CRITICAL TEMPERATURES; CRITICAL VOLUMES; HIGH TEMPERATURES; HIGH PRESSURES; IONIZATION CONSTANTS; APPARENT MOLAL VOLUMES; PARTIAL MOLAL VOLUMES; PRESSURE; DENSITY; ELECTROSTRICTION; SOLUTIONS; CRITICAL PHENOMENA; WATER; SODIUM CHLORIDE ID CORRESPONDING-STATES; CRITICAL-POINT; NACL-H2O; FLUID; THERMODYNAMICS; ELECTROLYTES; BEHAVIOR; CONSTANT; EQUATION AB A model based on solvation-electrostriction-ionization properties is developed to fit the critical density curve of aqueous sodium chloride solutions from 0 to 4.28 molal at temperatures from 374 to 566-degrees-C. Apparent solution ideality is observed. The description indicates that each ion significantly electrostricts roughly 800 water molecules and neutral NaCl electrostricts insignificantly. Lack of electrostriction for neutral NaCl may explain why complete constants describe ionization equilibria so well. Molal volumes and pseudo-apparent molal volumes are described for both actual solutions and hypothetical solutions containing either 100% neutral NaCl molecules or fully ionized electrolyte (Na+ + Ct-). RP MARSHALL, WL (reprint author), OAK RIDGE NATL LAB,DIV CHEM,MAILSTOP 6110,OAK RIDGE,TN 37831, USA. NR 23 TC 6 Z9 6 U1 1 U2 2 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 JUN PY 1993 VL 22 IS 6 BP 539 EP 555 DI 10.1007/BF00646930 PG 17 WC Chemistry, Physical SC Chemistry GA LH216 UT WOS:A1993LH21600004 ER PT J AU NEWMAN, N LYONS, WG AF NEWMAN, N LYONS, WG TI HIGH-TEMPERATURE SUPERCONDUCTING MICROWAVE DEVICES - FUNDAMENTAL ISSUES IN MATERIALS, PHYSICS, AND ENGINEERING SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Review DE HIGH-T(C) SUPERCONDUCTIVITY; MICROWAVE DEVICES; THIN FILMS; SURFACE RESISTANCE; MICROWAVE DEVICE FABRICATION ID YBA2CU3O7-X THIN-FILMS; BA-CU-O; HIGH-TC SUPERCONDUCTORS; MAGNETIC PENETRATION DEPTH; PULSED LASER DEPOSITION; TRANSMISSION ELECTRON-MICROSCOPY; SEMICONDUCTOR HYBRID DEVICES; WAVE SURFACE-RESISTANCE; ULTRA-LOW-NOISE; CUPRATE SUPERCONDUCTORS AB High-T(c) superconductivity has generated a great deal of interest because of the challenges it presents in the fields of material science, condensed matter physics, and electrical engineering, and because of the potential applications which may result from these research efforts. Thin-film passive microwave components may become the first high-temperature superconducting (HTS) devices available for widespread use and commercialization. In this article, we review aspects of material science, physics, and engineering which directly impact high-T(c) superconducting microwave devices and discuss issues which determine the performance of these devices. Methods of growing HTS thin films on large-area substrates, techniques for fabricating single-level HTS passive microwave components, and the relevant properties of high-T(c) superconducting films are discussed, with a focus on thin films of the HTS material YBa2Cu3O7-delta. Several known mechanisms for microwave loss in both the superconductor and the dielectric substrate are presented. An overview of the general classes of superconducting passive microwave devices is given, and representative microwave devices which have been recently demonstrated are described in detail. Examples of a select few HTS active microwave components are also presented. Potential microwave applications are illustrated with comparisons to current technology. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, LINCOLN LAB, LEXINGTON, MA 02173 USA. RP UNIV CALIF BERKELEY, DEPT MAT SCI, BERKELEY, CA 94720 USA. RI Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 NR 292 TC 147 Z9 147 U1 1 U2 13 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1993 VL 6 IS 3 BP 119 EP 160 DI 10.1007/BF00625741 PG 42 WC Physics, Applied; Physics, Condensed Matter SC Physics GA LY234 UT WOS:A1993LY23400001 ER PT J AU HOLSTEIN, WL PARISI, LA SHEN, ZY WILKER, C BRENNER, MS MARTENS, JS AF HOLSTEIN, WL PARISI, LA SHEN, ZY WILKER, C BRENNER, MS MARTENS, JS TI SURFACE-RESISTANCE OF LARGE-AREA TL2BA2CACU2O8 THIN-FILMS AT MICROWAVE AND MILLIMETER-WAVE FREQUENCIES MEASURED BY 3 NONCAVITY TECHNIQUES SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SUPERCONDUCTOR; MICROWAVE SURFACE RESISTANCE; MEASUREMENT TECHNIQUES; TL2BA2CACU2O8 ID HIGH-TC SUPERCONDUCTORS; YBA2CU3O7 FILMS; POWER; SAPPHIRE; IMPEDANCE; FIELD AB The surface resistance R(s) of Tl2Ba2CaCu2O8 films fabricated on LaAlO3 wafers up to 3 inches (7.6 cm) in diameter through a post-deposition anneal process was measured over the frequency range 5.55-94.1 GHz by the following techniques: 5.55 and 27.5 GHz high-temperature superconductor (HTS) sapphire resonators, 10 GHz parallel plate resonator, and 94.1 GHz scanning confocal resonator. R(s) was found to exhibit a quadratic dependence on frequency f at 77 K: R(s) is-proportional-to f2.0+/-0.1. The highest-quality films yield R(s) = 145 +/- 15 muOMEGA at 10 GHz and 77 K. Scanning confocal resonator mapping of R(s) across a 2-inch (5.1 cm) diameter wafer yielded a base value for R(s) of 16 +/- 1 mOMEGA at 77 K and 94.1 GHz (equivalent to 180 +/- 10 muOMEGA at 10 GHz) and good uniformity in R(s) across the wafer. HTS-sapphire resonator measurements of R(s) for fifteen 1.2 cm square parts cut from a 3-inch diameter wafer yielded R(s) values scaled to 10 GHz of 196 +/- 10 muOMEGA at 80 K. Similar values were measured for Tl2Ba2CaCu2O8 films prepared on both sides of a 2-inch diameter wafer. R(s) values at 10 GHz and 80 K of 147-214 muOMEGA were maintained over the course of 40 independent and successive deposition runs and corresponding anneals under nominally identical film fabrication conditions. Surface resistance at 5.55 GHz remained below 80 muOMEGA for maximum rf magnetic fields up to 85 Oe at 4.2 K and 7 Oe at 80 K, respectively. Results are compared with predictions of the two-fluid model. The relative advantages and disadvantages of the different techniques for measuring surface resistance are discussed. C1 SANDIA NATL LABS,DEPT 1140,ALBUQUERQUE,NM 87185. RP HOLSTEIN, WL (reprint author), DUPONT CO INC,CENT RES & DEV,POB 80304,WILMINGTON,DE 19880, USA. NR 45 TC 38 Z9 38 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1993 VL 6 IS 3 BP 191 EP 200 DI 10.1007/BF00625746 PG 10 WC Physics, Applied; Physics, Condensed Matter SC Physics GA LY234 UT WOS:A1993LY23400006 ER PT J AU SHERA, CA ZWEIG, G AF SHERA, CA ZWEIG, G TI NONINVASIVE MEASUREMENT OF THE COCHLEAR TRAVELING-WAVE RATIO SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SPONTANEOUS OTOACOUSTIC EMISSIONS; ACOUSTIC EMISSIONS; BASILAR-MEMBRANE; MODEL; FREQUENCY; IMPEDANCE; ORIGIN; EAR AB The microstructure of threshold hearing curves and the frequency spectra of evoked otoacoustic emissions both often evince a roughly periodic series of maxima and minima. Current models for the generation of otoacoustic emissions explain the observed spectral regularity by supposing that since the cochlea maps frequency into position the spectral periodicity mirrors a spatial oscillation in the mechanics of the organ of Corti. In this view emissions are generated when forward-traveling waves reflect from periodic corrugations in the mechanics, suggesting that the amplitude of the cochlear traveling-wave ratio-defined to be the ratio of the backward- and forward-traveling cochlear waves at the stapes-should manifest pronounced maxima and minima with a corresponding periodicity. This paper describes measurements of stimulus-frequency emissions, establishes their analyticity properties, and uses them to explore the spatial distribution of mechanical inhomogeneities (emission ''generators'') in the human cochlea. The approximate form and frequency dependence of the cochlear traveling-wave ratio are determined noninvasively. The amplitude of the empirical traveling-wave ratio is a slowly varying, nonperiodic function of frequency, suggesting that the distribution of inhomogeneities is uncorrelated with the periodicity found in the threshold microstructure. The observed periodicities arise predominantly from the cyclic variation in relative phase between the forward-and backward-traveling waves at the stapes. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. CALTECH,DEPT PHYS,PASADENA,CA 91125. RP SHERA, CA (reprint author), SIGNIT INC,HEARING RES LAB,POB 1020,LOS ALAMOS,NM 87544, USA. NR 48 TC 56 Z9 59 U1 1 U2 2 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 JUN PY 1993 VL 93 IS 6 BP 3333 EP 3352 DI 10.1121/1.405717 PG 20 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LF769 UT WOS:A1993LF76900034 PM 8326061 ER PT J AU BUTT, DP WALLACE, TC AF BUTT, DP WALLACE, TC TI THE U-ZR-C TERNARY PHASE-DIAGRAM ABOVE 2473-K SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SYSTEM AB The U-Zr-C ternary phase diagram is optimized by graphical and numerical curve fitting of self-consistent thermodynamic and phase diagram data reported in the literature. The system is described from 2473 to 3693 K using isothermal ternary phase diagrams. The solidus and liquidus curves of the UxZr1-xCy solid solution were estimated from combined thermodynamic and phase diagram data. The solidus and liquidus curves in the ternary system were calculated using a modified form of a free-energy minimization method developed by Rudy and Chang. The calculated curves agree with experimental data. RP BUTT, DP (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,NUCL FUELS TECHNOL GRP,LOS ALAMOS,NM 87545, USA. RI Butt, Darryl/B-7480-2008 OI Butt, Darryl/0000-0003-4501-8864 NR 34 TC 5 Z9 6 U1 3 U2 4 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 JUN PY 1993 VL 76 IS 6 BP 1409 EP 1419 DI 10.1111/j.1151-2916.1993.tb03919.x PG 11 WC Materials Science, Ceramics SC Materials Science GA LZ286 UT WOS:A1993LZ28600003 ER PT J AU DEARELLANOLOPEZ, AR DOMINGUEZRODRIGUEZ, A GORETTA, KC ROUTBORT, JL AF DEARELLANOLOPEZ, AR DOMINGUEZRODRIGUEZ, A GORETTA, KC ROUTBORT, JL TI PLASTIC-DEFORMATION MECHANISMS IN SIC-WHISKER-REINFORCED ALUMINA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SILICON-CARBIDE WHISKERS; CREEP DEFORMATION; TOUGHENING BEHAVIOR; CERAMIC COMPOSITES; MATRIX COMPOSITES; COMPRESSIVE CREEP; AL2O3; MICROSTRUCTURE; FAILURE; FLOW AB SiC-whisker-reinforced Al2O3 samples (SiC(w)/Al2O3), obtained from three different manufacturers, containing 0-30 vol% SiC have been crept under compression at 1400-degrees-C in flowing argon. Compressive creep tests and microstructural observations have been used to characterize the plastic deformation mechanisms. The presence of whiskers decreased the creep rate by reducing grain-boundary sliding. Damage formation was increased, however, because the whiskers acted as stress concentration sites. For specimens with whisker loadings greater than 15%, the absolute creep rate was not strongly dependent on whisker concentration, and the formation of cavitation damage was negligible below a critical stress that depended on the fabrication procedure of the specimen. This creep regime was characterized by a stress exponent of approximately 1, in which deformation occurred primarily by diffusional flow. For the materials with less SiC, the deformation occurred primarily by grain-boundary sliding. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DEARELLANOLOPEZ, AR (reprint author), UNIV SEVILLA,DEPT FIS MAT CONDESADA,E-41080 SEVILLE,SPAIN. NR 41 TC 27 Z9 27 U1 1 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1993 VL 76 IS 6 BP 1425 EP 1432 PG 8 WC Materials Science, Ceramics SC Materials Science GA LZ286 UT WOS:A1993LZ28600005 ER PT J AU FUNKENBUSCH, EF PLOVNICK, RH BECHER, PF AF FUNKENBUSCH, EF PLOVNICK, RH BECHER, PF TI PROPERTIES OF ZIRCONIA CERIA HAFNIA ALLOYS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID ELASTIC-PLASTIC INDENTATION; TETRAGONAL ZRO2; FRACTURE-TOUGHNESS; PHASE-TRANSFORMATION; GRAIN-SIZE; CERAMICS; POWDERS; BEHAVIOR; SYSTEM; HARDNESS AB Tetragonal zirconia alloys containing up to 18 mol% ceria and 30 mol% hafnia were prepared by several wet-chemical techniques, sintered to high density, and their microstructural and physical properties studied. Toughening in such alloys depends on the retention of the metastable tetragonal phase and the stress required for its transformation to the monoclinic phase. The degree of metastability of the tetragonal phase in these ternary zirconia alloys was a function of the relative amounts of ceria and hafnia present. Such alloying, along with control of grain size, provides an ability to modify the fracture toughness and the temperature range over which the toughness is optimized. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP FUNKENBUSCH, EF (reprint author), THREE M CO,CTR CERAM TECHNOL,ST PAUL,MN 55144, USA. NR 38 TC 1 Z9 1 U1 2 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1993 VL 76 IS 6 BP 1531 EP 1536 DI 10.1111/j.1151-2916.1993.tb03935.x PG 6 WC Materials Science, Ceramics SC Materials Science GA LZ286 UT WOS:A1993LZ28600019 ER PT J AU TUTTLE, BA VOIGT, JA GOODNOW, DC LAMPPA, DL HEADLEY, TJ EATOUGH, MO ZENDER, G NASBY, RD RODGERS, SM AF TUTTLE, BA VOIGT, JA GOODNOW, DC LAMPPA, DL HEADLEY, TJ EATOUGH, MO ZENDER, G NASBY, RD RODGERS, SM TI HIGHLY ORIENTED, CHEMICALLY PREPARED PB(ZR,TI)O3 THIN-FILMS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID EPITAXIAL-GROWTH AB We have fabricated highly oriented, chemically prepared thin films of Pb(Zr0.40Ti0.60)O3 (PZT 40/60) on both insulating and conducting substrates. While (100) MgO single crystals were used as the insulating substrates, the conducting substrates were fabricated by RF magnetron sputter deposition of 100-nm-thick (100) Pt films onto (100) MgO substrates. For comparison, we also fabricated PZT 40/60 films that had no significant preferential orientation on platinized MgO substrates. Sputter deposition of an underlying amorphous Pt film was used to fabricate randomly oriented PZT 40/60 films. Highly (001) oriented PZT 40/60 films had higher remanent polarization (61 muC/cm2 compared to 41 muC/cm2) and lower relative dielectric constant (368 compared to 466) than PZT 40/60 films that were randomly oriented. RP TUTTLE, BA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 109 Z9 109 U1 5 U2 17 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 JUN PY 1993 VL 76 IS 6 BP 1537 EP 1544 DI 10.1111/j.1151-2916.1993.tb03936.x PG 8 WC Materials Science, Ceramics SC Materials Science GA LZ286 UT WOS:A1993LZ28600020 ER PT J AU DOYLE, M FULLER, TF NEWMAN, J AF DOYLE, M FULLER, TF NEWMAN, J TI MODELING OF GALVANOSTATIC CHARGE AND DISCHARGE OF THE LITHIUM POLYMER INSERTION CELL SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID BATTERY; INTERFACE AB The galvanostatic charge and discharge of a lithium anode/solid polymer separator/insertion cathode cell is modeled using concentrated solution theory. The model is general enough to include a wide range of polymeric separator materials, lithium salts, and composite insertion cathodes. Insertion of lithium into the active cathode material is simulated using superposition, thus greatly simplifying the numerical calculations. Variable physical properties are permitted in the model. The results of a simulation of the charge/discharge behavior of the Li\PEO8-LiCF3SO3\TiS2 system are presented. Criteria are established to assess the importance of diffusion in the solid matrix and transport in the electrolyte. Consideration is also given to various procedures for optimization of the utilization of active cathode material. C1 LAWRENCE BERKELEY LAB,DIV CHIM,BERKELEY,CA 94720. RP DOYLE, M (reprint author), UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720, USA. RI Newman, John/B-8650-2008 OI Newman, John/0000-0002-9267-4525 NR 22 TC 894 Z9 910 U1 44 U2 247 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 JUN PY 1993 VL 140 IS 6 BP 1526 EP 1533 DI 10.1149/1.2221597 PG 8 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LG410 UT WOS:A1993LG41000011 ER PT J AU GRABOWSKI, AJ NEWMAN, J AF GRABOWSKI, AJ NEWMAN, J TI CURRENT AND POTENTIAL DISTRIBUTIONS ON A CYLINDER ELECTRODE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID PARALLEL AB Current and potential distributions, satisfying Laplace's equation and obtained by superposition of ring sources, are developed and discussed for a cylinder electrode embedded in an infinite insulating cylinder. For the primary distribution, the resistance and the coefficient describing how the current density goes to infinity at the edge of the electrode are presented as functions of the aspect ratio of the electrode. For a uniform current density on the electrode, the maximum potential variation on the electrode is presented as a function of the aspect ratio. For linear electrode kinetics, the condition for nearly uniform electrode current density is quantified, and the ratio of edge to center current densities is developed for kinetic parameters that lead toward the primary distribution. Current and potential distributions on the electrode and the adjoining insulator are presented for these three cases, and some asymptotic formulas are developed for high and low aspect ratios. This geometry is of interest in applications of cathodic protection. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP GRABOWSKI, AJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Newman, John/B-8650-2008 OI Newman, John/0000-0002-9267-4525 NR 13 TC 7 Z9 7 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 JUN PY 1993 VL 140 IS 6 BP 1625 EP 1631 DI 10.1149/1.2221613 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LG410 UT WOS:A1993LG41000027 ER PT J AU FAGUY, PW MARKOVIC, N ROSS, PN AF FAGUY, PW MARKOVIC, N ROSS, PN TI ANION ADSORPTION ON PT(100) FROM SULFURIC-ACID - ELECTROCHEMISTRY AND FOURIER-TRANSFORM INFRARED-SPECTROSCOPY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID REFLECTION-ABSORPTION-SPECTROSCOPY; SINGLE-CRYSTAL ELECTRODES; PLATINUM-ELECTRODE; BISULFATE ADSORPTION; SURFACES; HYDROGEN; PT(111); VOLTAMMETRY; FTIR; ELECTROSORPTION AB The adsorption of bisulfate and sulfate anions from 0.05M H2SO4 solution on Pt(100) was characterized by Fourier transform infrared spectroscopy (FTIR). Subtractively normalized interfacial FTIR spectra (SNIFTIRS) indicated only weak adsorption of bisulfate at potentials below 0.4 V (vs. PdH), in contrast to the strong adsorption seen on the (111) surface by the same technique. At potentials above 0.6 V the SNIFTIRS spectra were due entirely to diffuse layer species. At potentials between 0.4 and 0.6 V, changes in the IR bands indicated either a rearrangement (and possibly deprotonation) of adsorbed bisulfate or weak adsorption of sulfate ion. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV BELGRADE,ICTM,INST ELECTROCHEM,BELGRADE,YUGOSLAVIA. RP FAGUY, PW (reprint author), UNIV LOUISVILLE,DEPT CHEM,LOUISVILLE,KY 40292, USA. NR 26 TC 40 Z9 40 U1 0 U2 8 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 JUN PY 1993 VL 140 IS 6 BP 1638 EP 1641 DI 10.1149/1.2221615 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LG410 UT WOS:A1993LG41000029 ER PT J AU RYE, RR RICCO, AJ AF RYE, RR RICCO, AJ TI PATTERNED ADHESION OF ELECTROLESSLY DEPOSITED COPPER ON POLY(TETRAFLUOROETHYLENE) SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID RADIATION AB Electroless deposition of Cu on Na naphthalenide-etched poly(tetrafluoroethylene) (PTFE) leads to adherent Cu film growth through a three-step solution process involving (i) sensitization by adsorption of Sn(II), (ii) reduction of Pd(II) by adsorbed Sn(II) to produce Pd0 nucleation sites, and (iii) reduction of Cu(II) by formaldehyde for Cu film growth. Cu film thickness is determined by exposure time in the Cu(II) solution. Adhesion is determined partly by the initial Sn(II) sensitization step: Sn from an aqueous solution is adsorbed onto and absorbed into the rough, porous, etched surface to produce a mechanically interlocked ''Sn-base'' for the subsequent steps. Patterned deposition of adherent Cu is achieved via area-selective irradiation of the surface to produce cross-linking and, subsequently, area selective etching. This results in major differences in adhesion strength of the resultant Cu film between the irradiated and nonirradiated areas: the Cu film on nonirradiated areas is not affected by a ''Scotch-tape'' peel test while on irradiated areas XPS spectra show that the Cu film, the Sn sensitizer layer, the nucleation sites, and a major fraction of the etched layer are all easily and cleanly removed. After selective peeling of the Cu film and the active layer, continuation of Cu deposition in the Cu(II)/HCHO solution results in Cu deposition only on the remaining Cu film. Because the Sn/Pd sensitization/nucleation steps are general, the present results apply to all metals that can be electrolessly deposited. RP RYE, RR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Ricco, Antonio/A-5273-2010; OI Ricco, Antonio/0000-0002-2355-4984 NR 15 TC 23 Z9 23 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 JUN PY 1993 VL 140 IS 6 BP 1763 EP 1768 DI 10.1149/1.2221638 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LG410 UT WOS:A1993LG41000052 ER PT J AU CLEAR, R BERMAN, S AF CLEAR, R BERMAN, S TI ECONOMICS AND LIGHTING LEVEL RECOMMENDATIONS SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article RP CLEAR, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1993 VL 22 IS 2 BP 77 EP 86 PG 10 WC Optics SC Optics GA LP577 UT WOS:A1993LP57700009 ER PT J AU BAILEY, I CLEAR, R BERMAN, S AF BAILEY, I CLEAR, R BERMAN, S TI SIZE AS A DETERMINANT OF READING SPEED SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article RP BAILEY, I (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 23 Z9 23 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1993 VL 22 IS 2 BP 102 EP 117 PG 16 WC Optics SC Optics GA LP577 UT WOS:A1993LP57700012 ER PT J AU BERMAN, SM FEIN, G JEWETT, DL ASHFORD, F AF BERMAN, SM FEIN, G JEWETT, DL ASHFORD, F TI LUMINANCE-CONTROLLED PUPIL SIZE AFFECTS LANDOLT-C TASK-PERFORMANCE SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 0 TC 28 Z9 30 U1 0 U2 5 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1993 VL 22 IS 2 BP 150 EP 165 PG 16 WC Optics SC Optics GA LP577 UT WOS:A1993LP57700014 ER PT J AU SAKUMA, T HOSHINO, S AF SAKUMA, T HOSHINO, S TI DIFFUSE-SCATTERING OF SINGLE-CRYSTAL ALPHA-AGI BY NEUTRON-SCATTERING MEASUREMENT SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article AB Neutron scattering measurement of the diffuse scattering of single crystal alpha-AgI was performed with the DELTAE congruent-to 0 scan method. The feature of the observed intensity of the diffuse scattering was explained by the theory including the correlations among the thermal displacements of atoms. Most of the intensities of the diffuse scattering with the DELTAE congruent-to 0 scan method corresponds to the static disorder scattering among silver atoms. C1 UNIV TOKYO, INST SOLID STATE PHYS, TOKYO 106, JAPAN. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP SAKUMA, T (reprint author), IBARAKI UNIV, FAC SCI, DEPT PHYS, MITO, IBARAKI 310, JAPAN. NR 8 TC 4 Z9 4 U1 0 U2 0 PU PHYSICAL SOC JAPAN PI TOKYO PA YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD JUN PY 1993 VL 62 IS 6 BP 2048 EP 2050 DI 10.1143/JPSJ.62.2048 PG 3 WC Physics, Multidisciplinary SC Physics GA LH601 UT WOS:A1993LH60100033 ER PT J AU EVANS, RW MANNINEN, DL DONG, FB AF EVANS, RW MANNINEN, DL DONG, FB TI AN ECONOMIC-ANALYSIS OF HEART-LUNG TRANSPLANTATION - COSTS, INSURANCE-COVERAGE, AND REIMBURSEMENT SO JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY LA English DT Article ID PROSPECTIVE PAYMENT SYSTEM; FIBROSIS AB Rarely has the cost of heart-lung transplantation received attention. Although the procedure is still largely regarded as experimental, this does not diminish the significance of costs. The National Cooperative Transplantation Study was undertaken to better understand the costs of all transplants, including heart-lung transplantation. Data on transplantation charges from date of procedure to discharge were obtained from more than 65 % of all heart-lung transplantation programs active in 1988. These programs accounted for 61 % of all transplantations performed in 1988. Valid sample survey data (no more than 25 procedures per center) were obtained for 42 patients, or approximately 58% of all procedures done in the United States. Detailed data were also collected on sources of payment and amount reimbursed. Because of outlier data, we report statistical medians, rather than means, as our measure of central tendency. The median charge for heart-lung transplantation was $134,881, with an average hospital stay of 31 days. Total charges fell between $99,535 and $216,639 for 50% of the cases studied. Half of the patients spent between 23 and 49 days in the hospital. Because of the small number of cases available for analysis, it was not meaningful to cross-classify the data according to various prognostic variables. More than 78% of the procedures studied were paid for by private insurers. Reimbursement exceeded 90% of billed charges for 84.6% of the cases analyzed. Despite the experimental status of heart-lung transplantation, insurance reimbursement has been favorable for those heart-lung transplantations that insurers have covered. Nevertheless, the future of heart-lung transplantation is unclear. The availability of donors remains a serious constraint, as is seen in the decrease of procedures performed annually. In fact, lung transplantation now appears to be the preferred approach to the treatment of pulmonary disease. C1 BATTELLE SEATTLE RES CTR,HLTH & POPULAT RES CTR,SEATTLE,WA. RP EVANS, RW (reprint author), MAYO CLIN & MAYO FDN,DEPT HLTH SCI RES,HLTH SERV EVALUAT SECT,ROCHESTER,MN 55905, USA. NR 56 TC 14 Z9 14 U1 0 U2 1 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-5223 J9 J THORAC CARDIOV SUR JI J. Thorac. Cardiovasc. Surg. PD JUN PY 1993 VL 105 IS 6 BP 972 EP 978 PG 7 WC Cardiac & Cardiovascular Systems; Respiratory System; Surgery SC Cardiovascular System & Cardiology; Respiratory System; Surgery GA LG087 UT WOS:A1993LG08700002 PM 8501947 ER PT J AU FISHER, RV ORSI, G ORT, M HEIKEN, G AF FISHER, RV ORSI, G ORT, M HEIKEN, G TI MOBILITY OF A LARGE-VOLUME PYROCLASTIC FLOW - EMPLACEMENT OF THE CAMPANIAN IGNIMBRITE, ITALY SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Article ID MOUNT ST-HELENS; MAGNETIC-SUSCEPTIBILITY MEASUREMENTS; TURBIDITY CURRENTS; TAUPO IGNIMBRITE; BANDELIER TUFF; WELDED TUFFS; NEW-ZEALAND; NEW-MEXICO; DIRECTIONS; ERUPTION AB The trachytic Campanian Ignimbrite, originally exposed over a 30,000-km2 area around Naples, Italy, is the product of a highly energetic, gas-rich eruption. The deposit lies in valleys and isolated watersheds, and in its medial and distal extent to the south, north and east of Naples, the Campanian pyroclastic current encountered mountains exceeding 1 000 meters. Anisotropy of magnetic susceptibility (AMS) measurements indicate that the Campanian pyroclastic current (the transport system) traveled radially outward from the Phlegrean Fields area, but the ignimbrite-forming flow (the deposition system that developed from the base of the transport system) moved downslope from mountainsides to valleys, including slopes facing the eruption source, and flowed down drainage systems from intermontane basins. The Campanian pyroclastic current flowed approximately 35 km over the water of the Bay of Naples to deposit > 43 m of ignimbrite on the south shore and also overtopped a 685-1000-m-high ridge of the Sorrento Peninsula to deposit more on the other side. The distribution of the ignimbrite and the measured flow directions suggest that the Campanian pyroclastic current moved across the landscape as an expanded (and therefore turbulent) decompressing flow rather than as a high-density, nonturbulent sheet-like current moving over mountains by momentum acquired by eruption column collapse. Strong expansion is corroborated by shard morphology that indicates derivation from highly inflated pumice and suggests vesicles must have been at least 80% by volume of the original magma. C1 UNIV NAPLES,DIPARTIMENTO GEOL & VULCANOL,I-80138 NAPLES,ITALY. NO ARIZONA UNIV,DEPT GEOL,FLAGSTAFF,AZ 86011. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP FISHER, RV (reprint author), UNIV CALIF SANTA BARBARA,DEPT GEOL SCI,SANTA BARBARA,CA 93106, USA. NR 77 TC 177 Z9 177 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD JUN PY 1993 VL 56 IS 3 BP 205 EP 220 DI 10.1016/0377-0273(93)90017-L PG 16 WC Geosciences, Multidisciplinary SC Geology GA LK824 UT WOS:A1993LK82400002 ER PT J AU DITLEVSEN, PD GARDIN, DE VANHOVE, MA SOMORJAI, GA AF DITLEVSEN, PD GARDIN, DE VANHOVE, MA SOMORJAI, GA TI MOLECULAR MODELING OF AMINE DEHYDROGENATION ON NI(111) SO LANGMUIR LA English DT Article ID CLUSTER COMPLEXES; SURFACE; ADSORPTION; CRYSTAL; CHEMISORPTION; ACETONITRILE; COORDINATION; REDUCTION; HYDROGEN AB The binding energies of the decomposition products and intermediate surface species formed on Ni(111) from adsorption of ethylamine (CH3CH2NH2) have been calculated, using semiempirical model based on the extended-Huckel theory to calculate the energies of the surface ligands and the gas-phase molecules. The results provide information about the energetics of the intermediate surface species which is not directly accessible experimentally. With this insight we have inferred a decomposition pathway which supports the one proposed by a recent experimental study. Furthermore, the calculations suggest a pathway for the hydrogenation to ethylamine (CH3CH2NH2) from coadsorption of acetonitrile (CH3CN) and hydrogen (H-2) on the surface. This proposal awaits experimental examination. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 18 TC 13 Z9 14 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1993 VL 9 IS 6 BP 1500 EP 1503 DI 10.1021/la00030a013 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LJ256 UT WOS:A1993LJ25600013 ER PT J AU DIETZ, ML HORWITZ, EP AF DIETZ, ML HORWITZ, EP TI NOVEL CHROMATOGRAPHIC MATERIALS BASED ON NUCLEAR WASTE PROCESSING CHEMISTRY SO LC GC-MAGAZINE OF SEPARATION SCIENCE LA English DT Article ID TRUEX PROCESS; CROWN-ETHER; EXTRACTION; STRONTIUM; RECOVERY; SOLVENT; DERIVATIVES; SEPARATION; ACTINIDES AB Considerable progress has been made recently in the development of efficient and selective liquid-liquid extraction methods for the isolation of various radionuclides from nuclear waste streams. These methods, with minor modification, can be adapted to produce new chromatographic materials capable of selectively sorbing any of a variety of elements from biological, geological, and environmental samples. This article explores the relationship between waste processing chemistry and extraction chromatography and describes applications of the new chromatographic materials that such progress has provided. RP DIETZ, ML (reprint author), ARGONNE NATL LAB,DIV REACTOR ANAL & SAFETY,DIV CHEM,ARGONNE,IL 60439, USA. NR 44 TC 29 Z9 29 U1 3 U2 7 PU ADVANSTAR COMMUNICATIONS PI DULUTH PA 131 W FIRST ST, DULUTH, MN 55802 SN 0888-9090 J9 LC GC-MAG SEP SCI JI LC GC-Mag. Sep. Sci. PD JUN PY 1993 VL 11 IS 6 BP 424 EP & PG 0 WC Chemistry, Analytical SC Chemistry GA LE196 UT WOS:A1993LE19600004 ER PT J AU BLAU, PJ KEISER, JR JACKSON, RL AF BLAU, PJ KEISER, JR JACKSON, RL TI A COMPARISON OF 3 MICROINDENTATION HARDNESS SCALES AT LOW AND ULTRALOW LOADS SO MATERIALS CHARACTERIZATION LA English DT Article AB Indentation hardness tests were performed on thick, fine-grained, electro-formed deposits of copper and nickel using Knoop, Vickers, and Berkovich indenters. The latter type of indenter was used for shallow penetrations (85-1750nm), and results are reported in terms of nanoscale hardness (NH) numbers. Knoop and Vickers indenters were used with applied loads of between 0.15 and 0.98 N, and at the lowest load, produced indentation depths comparable to the larger ones obtained with the Berkovich indenter. The NH numbers became very sensitive to penetration depth when the penetration depth was less than certain critical values. NH numbers for Cu and Ni were higher than those for Knoop and Vickers testing at comparable penetration depths. Applying indenter area function corrections to calculate hardness numbers (i.e., considering projected area versus facet contact area) resulted in a closer correlation between microhardness and nanohardness scales; however, changes in the tip shape because of wear or other imperfections.can lead to inaccurate calculation of NH numbers at the lowest loads. Results also suggest that the interconversion of lowload hardness numbers from one scale to another can be material-dependent. RP BLAU, PJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 9 TC 3 Z9 3 U1 4 U2 8 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 JUN PY 1993 VL 30 IS 4 BP 287 EP 293 DI 10.1016/1044-5803(93)90076-8 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA LD727 UT WOS:A1993LD72700008 ER PT J AU XU, P MORRIS, JW AF XU, P MORRIS, JW TI COMPUTER-SIMULATION OF MARTENSITIC TRANSFORMATIONS IN CONSTRAINED, 2-DIMENSIONAL CRYSTALS UNDER EXTERNAL STRESS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article AB This article reports a computer simulation study of the microstructures produced by martensitic transformations. In the present work. the transformation strain is dyadic, and the transformation is athermal and irreversible. The transformation occurs in a two-dimensional crystal that is constrained in a matrix that has no net transformation strain and may be subject to external stress. The crystal is divided into elementary cells. The transformation is simulated by computing the elastic strain energy in the linear elastic approximation and transforming the most-favored cell in each step to generate the minimum-energy transformation path. The simulation generates the microstructure at each step of the transformation and plots a temperature-transformation (TT) curve by computing the chemical driving force required to maintain the transformation and assuming that it is proportional to the undercooling. The results show that the matrix constraint causes complex, multivariant microstructures and separates M(s) and M(f). Multiple variants partly relax the shear part of transformation strain but interfere so that the transformation is difficult to maintain. The dilational part of the transformation strain produces interesting microstructures, such as ''butterfly martensite,'' in partially transformed crystals. It also increases DELTAM since it produces a hydrostatic stress that cannot be compensated by mixing variants. The applied stress can be divided into hydrostatic and deviatoric components. The hydrostatic component changes M(s) without altering the microstructure or DELTAM. The deviatoric stress changes the relative energies of the variants and produces a microstructure that is rich in the favored variant. It also increases DELTAM, since single-variant transformations must be sustained against an accumulating, uncompensated shear. The thermal resistance (DELTAM) increases with the magnitude of the deviatoric stress until a high-stress limit is reached and only one variant appears. The microstructure is most complex at intermediate stress, where both variants develop in a complex internal stress field. Cyclic stress dramatically increases the extent of transformation at given maximum load. The martensite that has already formed becomes a source of intense internal stress when the stress is reversed, promoting further transformation. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP XU, P (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 11 TC 10 Z9 10 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 JUN PY 1993 VL 24 IS 6 BP 1281 EP 1294 DI 10.1007/BF02668197 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA LF116 UT WOS:A1993LF11600008 ER PT J AU SCHNEIBEL, JH DAROLIA, R LAHRMAN, DF SCHMAUDER, S AF SCHNEIBEL, JH DAROLIA, R LAHRMAN, DF SCHMAUDER, S TI FRACTURE MORPHOLOGY OF NIAL SINGLE-CRYSTALS TESTED IN TENSION SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID SLIP SYSTEMS AB The fracture surfaces of NiAl single crystals, strained to fracture in uniaxial tension at room temperature, were analyzed by scanning electron microscopy (SEM). Contrary to several previous reports, no preference for {011} cleavage was found. Occasionally, fracture facets close to {115} and {117} planes were observed. For the [011] orientation, fracture tended to occur at a 45 deg angle to the tensile axis (i.e., in the direction of maximum shear stress). In the case of the [111] orientation, fracture facets exhibited similar angles but were, at the same time, close to {011} planes. In a [001] specimen, the fracture surface normals tended to include an angle close to 35 deg with the tensile axis. This suggests that the tensile fracture of [001] crystals could be associated with [111]{112} slip. C1 GE AIRCRAFT ENGINES, CINCINNATI, OH 45215 USA. MAX PLANCK INST MET RES, W-7000 STUTTGART 80, GERMANY. RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 21 TC 13 Z9 13 U1 0 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 0360-2133 J9 METALL TRANS A PD JUN PY 1993 VL 24 IS 6 BP 1363 EP 1371 DI 10.1007/BF02668204 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA LF116 UT WOS:A1993LF11600015 ER PT J AU RAPPAZ, M VITEK, JM DAVID, SA BOATNER, LA AF RAPPAZ, M VITEK, JM DAVID, SA BOATNER, LA TI MICROSTRUCTURAL FORMATION IN LONGITUDINAL BICRYSTAL WELDS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID ELECTRON-BEAM WELDS; CRYSTAL AB The formation and selection processes in dendritic microstructures that occur during the welding of two differently oriented Fe-15 wt pct Ni-15 wt pct Cr single-crystal pieces were analyzed. The specimens were oriented by X-ray diffraction and cut along precise crystallographic orientations in order to weld specific surfaces in a manner that joined two distinct, predetermined crystallographic directions. Six orientation configurations were selected in the present investigation: an (001) surface with a [100] or [110] direction, an (011) surface with a [100], [011BAR], or [211BAR] direction, and a (111) surface with a [211BAR] direction. Using all of the possible combinations of two different crystal orientations (i.e., 15 combinations), two crystal halves were welded along their boundary using an electron beam to form longitudinal bicrystal welds. Experimental and simulated metallographic sections have been directly compared for six of the 15 bicrystal weld configurations. The dendritic pattern observed in transverse metallographic sections was analyzed for each single-crystal half on the basis of a selection criterion that had been developed previously for single-crystal welds; i.e. at a given location in the melt pool, the selected (100) dendrite trunk has the minimum undercooling or, equivalently, the minimum velocity. In general, the bicrystal weld microstructure is a simple composite of microstructures expected in each of the two single-crystal halves. However, near the weld centerline, it was shown that grain competition between dendrites belonging to different single crystals also occurred according to this same minimum undercooling criterion. C1 ECOLE POLYTECH FED LAUSANNE,DEPT MAT,CH-1007 LAUSANNE,SWITZERLAND. RP RAPPAZ, M (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 5 TC 18 Z9 19 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 JUN PY 1993 VL 24 IS 6 BP 1433 EP 1446 DI 10.1007/BF02668211 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA LF116 UT WOS:A1993LF11600022 ER PT J AU KUMAR, AM MOODY, NR HIRTH, JP GORDON, JA AF KUMAR, AM MOODY, NR HIRTH, JP GORDON, JA 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 Note ID FRACTURE C1 SANDIA NATL LABS,LIVERMORE,CA 94550. ADV SILICON MAT INC,MOSES LAKE,WA 98837. RP KUMAR, AM (reprint author), WASHINGTON STATE UNIV,DEPT MECH & MAT ENGN,PULLMAN,WA 99164, USA. NR 6 TC 11 Z9 11 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 JUN PY 1993 VL 24 IS 6 BP 1450 EP 1451 DI 10.1007/BF02668213 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA LF116 UT WOS:A1993LF11600024 ER PT J AU BONNELL, BS LARABELL, C CHANDLER, DE AF BONNELL, BS LARABELL, C CHANDLER, DE TI THE SEA-URCHIN EGG JELLY COAT IS A 3-DIMENSIONAL FIBROUS NETWORK AS SEEN BY INTERMEDIATE VOLTAGE ELECTRON-MICROSCOPY AND DEEP-ETCHING ANALYSIS SO MOLECULAR REPRODUCTION AND DEVELOPMENT LA English DT Article DE SEA URCHIN; FERTILIZATION; EXTRACELLULAR MATRIX; EGG JELLY ID ACROSOME REACTION; SPERM; SPERMATOZOA; INDUCTION; CALCIUM AB The egg jelly (EJ) coat which surrounds the unfertilized sea urchin egg undergoes extensive swelling upon contact with sea water, forming a three-dimensional network of interconnected fibers extending nearly 50 mum from the egg surface. Owing to its solubility, this coat has been difficult to visualize by light and electron microscopy. However, Lytechinus pictus EJ coats remain intact, if the fixation medium is maintained at pH 9. The addition of alcian blue during the final dehydration step of sample preparation stains the EJ for visualization of resin embedded eggs by both light and electron microscopy. Stereo pairs taken of thick sections prepared for intermediate voltage electron microscopy (IVEM) produce a three-dimensional image of the EJ network, consisting of interconnected fibers decorated along their length by globular jelly components. Using scanning electron microscopy (SEM), we have shown that before swelling, EJ exists in a tightly bound network of jelly fibers, 50-60 nm in diameter. In contrast, swollen EJ consists of a greatly extended network whose fibrous components measure 10 to 30 nm in diameter. High resolution stereo images of hydrated jelly produced by the quick-freeze/deep-etch/rotary-shadowing technique (QF/DE/RS) show nearly identical EJ networks, suggesting that dehydration does not markedly alter the structure of this extracellular matrix. C1 LAWRENCE BERKELEY LAB,IVEM FACIL,BERKELEY,CA 94720. RP BONNELL, BS (reprint author), ARIZONA STATE UNIV,DEPT ZOOL,MOLEC & CELLULAR BIOL PROGRAM,TEMPE,AZ 85287, USA. FU NCRR NIH HHS [RR05097] NR 14 TC 18 Z9 18 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 1040-452X J9 MOL REPROD DEV JI Mol. Reprod. Dev. PD JUN PY 1993 VL 35 IS 2 BP 181 EP 188 DI 10.1002/mrd.1080350212 PG 8 WC Biochemistry & Molecular Biology; Cell Biology; Developmental Biology; Reproductive Biology SC Biochemistry & Molecular Biology; Cell Biology; Developmental Biology; Reproductive Biology GA LD313 UT WOS:A1993LD31300011 PM 8318223 ER PT J AU SMOLARKIEWICZ, PK MARGOLIN, LG AF SMOLARKIEWICZ, PK MARGOLIN, LG TI ON FORWARD-IN-TIME DIFFERENCING FOR FLUIDS - EXTENSION TO A CURVILINEAR FRAMEWORK SO MONTHLY WEATHER REVIEW LA English DT Article ID ADVECTION TRANSPORT ALGORITHM AB This paper extends the discussion of fully second-order-accurate, forward-in-time, finite-difference schemes for the advection equation with arbitrary forcing (which is viewed as a prototype for the prognostic equations of fluid dynamics) to an arbitrary curvilinear system of coordinates. Since forward-in-time schemes derive ultimately from Taylor series analysis of the uncentered-in-time differencing, it is important to include the appropriate metric terms explicitly into the algorithm's design. A rigorous truncation-error analysis leads to a compact scheme that preserves (to second-order accuracy) the consistency of Eulerian and Lagrangian formulations for fluids. Alternative approximations to the advective velocity in the transport flux are also discussed. In order to achieve second-order accuracy of the forward-in-time approximation, the advective velocity must be evaluated to at least first-order accuracy at the intermediate time level. Such a temporal staggering is usually simulated by means of either linear interpolation or linear extrapolation. The alternative considered in this paper employs an extrapolation consistent with the governing equations of motion. This approximation is derived from concepts inherent in Runge-Kutta methods for ordinary differential equations. It allows at least twice the usual time step in simulations of elastic systems, where high-speed propagating modes dominate the computational stability. These theoretical considerations are illustrated with idealized tests and examples of shallow-water flows on the sphere. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP SMOLARKIEWICZ, PK (reprint author), NATL CTR ATMOSPHER RES,DIV MESOSCALE & MICROSCALE METEOROL,BOULDER,CO 80307, USA. NR 16 TC 100 Z9 101 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD JUN PY 1993 VL 121 IS 6 BP 1847 EP 1859 DI 10.1175/1520-0493(1993)121<1847:OFITDF>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LE009 UT WOS:A1993LE00900018 ER PT J AU LI, J BLEWER, R MAYER, JW AF LI, J BLEWER, R MAYER, JW TI COPPER-BASED METALLIZATION FOR ULSI APPLICATIONS SO MRS BULLETIN LA English DT Editorial Material C1 ARIZONA STATE UNIV,CTR SOLID STATE SCI,TEMPE,AZ 85287. SANDIA NATL LABS,DEPT ADV SILICON PROJECTS,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,CONTAMINAT FREE MFG RES CTR,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. CORNELL UNIV,ITHACA,NY 14853. RP LI, J (reprint author), INTEL CORP,SANTA CLARA,CA 95051, USA. NR 0 TC 42 Z9 44 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1993 VL 18 IS 6 BP 18 EP 21 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA LH304 UT WOS:A1993LH30400001 ER PT J AU NORTHRUP, CJM AF NORTHRUP, CJM TI MRS - PAST AND FUTURE SO MRS BULLETIN LA English DT Editorial Material RP NORTHRUP, CJM (reprint author), SANDIA NATL LABS,DEPT ES&H QUAL TECH COORDINAT,9002,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1993 VL 18 IS 6 BP 60 EP 61 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA LH304 UT WOS:A1993LH30400009 ER PT J AU WIENCEK, TC AF WIENCEK, TC TI SELLING SCIENCE TO THE MTV GENERATION SO MRS BULLETIN LA English DT Editorial Material RP WIENCEK, TC (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,MECH MAT SECT,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1993 VL 18 IS 6 BP 62 EP 63 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA LH304 UT WOS:A1993LH30400010 ER PT J AU KAINA, B FRITZ, G COQUERELLE, T MITRA, S HARTENSTEIN, B HOFMANN, E AF KAINA, B FRITZ, G COQUERELLE, T MITRA, S HARTENSTEIN, B HOFMANN, E TI MODULATION OF DNA-REPAIR ACTIVITY IN MAMMALIAN-CELLS AND ITS EFFECT ON PROTECTION AGAINST GENOTOXIC EFFECTS OF ALKYLATING-AGENTS SO MUTATION RESEARCH LA English DT Meeting Abstract C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST GENET & TOXIKOL,W-7500 KARLSRUHE 1,GERMANY. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD JUN PY 1993 VL 291 IS 3 BP 247 EP 248 PG 2 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA LF118 UT WOS:A1993LF11800062 ER PT J AU STRAUME, T RAABE, OG WALSH, KJ WILEY, LM AF STRAUME, T RAABE, OG WALSH, KJ WILEY, LM TI INHERITED EFFECTS FROM IRRADIATED MOUSE IMMATURE OOCYTES DETECTED IN AGGREGATION EMBRYO CHIMERAS SO MUTATION RESEARCH LA English DT Article DE IMMATURE OOCYTE; AGGREGATION EMBRYO CHIMERA; (MOUSE) ID FEMALE MICE; ASSAY; RADIATION; INVITRO; SENSITIVITY; MUTATIONS; TARGET AB Data obtained using the mouse-preimplantation-embryo-chimera assay are presented that show a transmitted effect following low-dose irradiation of immature oocytes in vivo. Six-week-old female mice were irradiated using Cs-137-gamma-rays (0.05 Gy, 0.15 Gy, and unexposed controls). At 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 weeks post exposure, the mice were mated and aggregation chimeras made from the 4-cell embryos. Three independent experiments have now be-en carried out, all showing a significant embryonic cell-proliferation disadvantage of the embryos obtained from the females treated 7 weeks previously, i.e., embryos from oocytes that were immature at the time of radiation exposure. No effect was detected at 1-6 weeks when embryos were obtained from maturing oocytes. Also, the effect was not seen at 8, 9, 10, 11, and 12 weeks post exposure. The implications of these results are discussed in the light of previous studies on mouse oocytes. C1 UNIV CALIF DAVIS,INST TOXICOL & ENVIRONM HLTH,DAVIS,CA 95616. UNIV CALIF DAVIS,DEPT OBSTET & GYNECOL,DIV REPROD BIOL & MED,DAVIS,CA 95616. RP STRAUME, T (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. FU NIEHS NIH HHS [R01 ES05409-01] NR 22 TC 9 Z9 9 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 JUN PY 1993 VL 287 IS 2 BP 243 EP 251 DI 10.1016/0027-5107(93)90017-A PG 9 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA LG445 UT WOS:A1993LG44500010 PM 7685484 ER PT J AU WEIFFENBACH, B DUBOIS, J STORVICK, D TAWIL, R JACOBSEN, SJ GILBERT, J WIJMENGA, C MENDELL, JR WINOKUR, S ALTHERR, MR SCHULTZ, P OLANDT, S FRANTS, RR PERICAKVANCE, M GRIGGS, RC AF WEIFFENBACH, B DUBOIS, J STORVICK, D TAWIL, R JACOBSEN, SJ GILBERT, J WIJMENGA, C MENDELL, JR WINOKUR, S ALTHERR, MR SCHULTZ, P OLANDT, S FRANTS, RR PERICAKVANCE, M GRIGGS, RC TI MAPPING THE FACIOSCAPULOHUMERAL MUSCULAR-DYSTROPHY GENE IS COMPLICATED BY CHROMOSOME-4Q35 RECOMBINATION EVENTS SO NATURE GENETICS LA English DT Article ID DELETION; MOSAICISM; MUTATION; CLONING AB A gene responsible for facioscapulohumeral muscular dystrophy (FSHD) has been linked to polymorphisms on chromosome 4q35. Multipoint linkage analyses have placed this gene distal to all reported genetic markers on the chromosome. By using as a probe a clone isolated from a cosmid containing sequences related to a homeobox domain, de novo DNA rearrangements were reported in sporadic and familial cases of FSHD. Linkage analysis of an EcoRI polymorphism detected by this clone in twenty-four multigenerational FSHD families revealed recombinants between this marker and the disease with a recombination fraction of 0.05. Two families with apparent germline mosaicism were also identified. C1 UNIV ROCHESTER,DEPT NEUROL,ROCHESTER,NY 14642. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. DUKE UNIV,DEPT MED,DURHAM,NC 27710. LEIDEN UNIV,DEPT HUMAN GENET,MGC,2300 RA LEIDEN,NETHERLANDS. OHIO STATE UNIV,DEPT NEUROL,COLUMBUS,OH 43210. UNIV CALIF IRVINE,DEPT BIOL CHEM,IRVINE,CA 92717. LANL,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,DEPT NEUROSCI,LA JOLLA,CA 92093. RP WEIFFENBACH, B (reprint author), COLLABORAT RES INC,WALTHAM,MA 02154, USA. RI Wijmenga, Cisca/D-2173-2009; OI Wijmenga, Cisca/0000-0002-5635-1614 FU NCRR NIH HHS [M01-RR0004, MO1-RR00034]; NIGMS NIH HHS [GM07311-18] NR 28 TC 63 Z9 63 U1 0 U2 2 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 1061-4036 J9 NAT GENET JI Nature Genet. PD JUN PY 1993 VL 4 IS 2 BP 165 EP 169 DI 10.1038/ng0693-165 PG 5 WC Genetics & Heredity SC Genetics & Heredity GA LF816 UT WOS:A1993LF81600017 PM 8102297 ER PT J AU BAXENDALE, S MACDONALD, ME MOTT, R FRANCIS, F LIN, C KIRBY, SF JAMES, M ZEHETNER, G HUMMERICH, H VALDES, J COLLINS, FS DEAVEN, LJ GUSELLA, JF LEHRACH, H BATES, GP AF BAXENDALE, S MACDONALD, ME MOTT, R FRANCIS, F LIN, C KIRBY, SF JAMES, M ZEHETNER, G HUMMERICH, H VALDES, J COLLINS, FS DEAVEN, LJ GUSELLA, JF LEHRACH, H BATES, GP TI A COSMID CONTIG AND HIGH-RESOLUTION RESTRICTION MAP OF THE 2 MEGABASE REGION CONTAINING THE HUNTINGTONS-DISEASE GENE SO NATURE GENETICS LA English DT Article ID LINKAGE DISEQUILIBRIUM; REFERENCE LIBRARIES; RECOMBINATION; D4S10; LOCALIZATION; CHROMOSOME-4; ASSOCIATION; TELOMERE; SEGMENT; MARKER AB The quest for the mutation responsible for Huntington's disease (HD) has required an exceptionally detailed analysis of a large part of 4p16.3 by molecular genetic techniques, making this stretch of 2.2 megabases one of the best characterized regions of the human genome. Here we describe the construction of a cosmid and Pl clone contig spanning the region containing the HD gene, and the establishment of a detailed, high resolution restriction map. This ordered clone library has allowed the identification of several genes from the region, and has played a vital role in the recent identification of the Huntington's disease gene. The restriction map provides the framework for the detailed analysis of a region extremely rich in coding sequences. This study also exemplifies many of the strategies to be used in the analysis of larger regions of the human genome. C1 HARVARD UNIV,MASSACHUSETTS GEN HOSP,NEUROGENET LAB,BOSTON,MA 02114. HARVARD UNIV,SCH MED,DEPT GENET,BOSTON,MA 02114. UNIV MICHIGAN,DEPT INTERNAL MED & HUMAN GENET,ANN ARBOR,MI 48109. UNIV MICHIGAN,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BAXENDALE, S (reprint author), IMPERIAL CANC RES FUND,GENOME ANAL LAB,44 LINCOLNS INN FIELDS,LONDON WC2A 3PX,ENGLAND. RI Bates, Gillian/E-1146-2012; Francis, Fiona/B-5854-2016 OI Bates, Gillian/0000-0002-4041-6305; FU NHGRI NIH HHS [HG00169]; NINDS NIH HHS [NS16367] NR 53 TC 73 Z9 73 U1 0 U2 2 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 1061-4036 J9 NAT GENET JI Nature Genet. PD JUN PY 1993 VL 4 IS 2 BP 181 EP & DI 10.1038/ng0693-181 PG 0 WC Genetics & Heredity SC Genetics & Heredity GA LF816 UT WOS:A1993LF81600020 PM 8348156 ER PT J AU DEWEY, SL SMITH, GS LOGAN, J BRODIE, JD AF DEWEY, SL SMITH, GS LOGAN, J BRODIE, JD TI MODULATION OF CENTRAL CHOLINERGIC ACTIVITY BY GABA AND SEROTONIN - PET STUDIES WITH C-11 BENZTROPINE IN PRIMATES SO NEUROPSYCHOPHARMACOLOGY LA English DT Article DE BENZTROPINE; GABA; SEROTONIN; INTERACTIONS; POSITRON EMISSION TOMOGRAPHY; ALTANSERIN; GAMMA-VINYL GABA ID POSITRON EMISSION TOMOGRAPHY; ACETYLCHOLINE-RELEASE; BABOON BRAIN; C-11 FLUMAZENIL; RAT STRIATUM; DOPAMINE; RECEPTOR; NEURONS; BINDING; RADIOLIGAND AB The pharmacologic treatment of many neuropsychiatric disorders (Alzheimer's disease, schizophrenia, depressive illness) has been targeted at the central hypothesis that defects in a single neurotransmitter system underlie the pathophysiology of the disease state. With the recognition that such treatments have not been efficacious consistently, recent drug development has been directed at altering other functionally linked neurotransmitters involved in these diseases. Using positron emission tomography, we have noninvasively investigated the effects of two noncholinergic drugs on the release of acetylcholine. By examining the effects of gamma-vinyl gamma-aminobutyric acid (GABA) (a GABA transaminase inhibitor) or altanserin (a serotonergic antagonist) on the regional binding of C-11-benztropine in the primate brain (Papio anubis), we demonstrated that drugs acting upon either GABAergic or serotonergic neurons produce profound regional changes in acetylcholine release. These findings indicate that the mechanisms of action and the subsequent therapeutic efficacy of these centrally acting drugs may be linked to their multitransmitter effects. This application of positron emission tomography represents an extremely promising experimental approach that can be directed towards elucidating abnormalities in neurotransmitter modulation relevant to disease progression and pharmacologic treatment. C1 NYU,SCH MED,DEPT PSYCHIAT,NEW YORK,NY 10016. RP DEWEY, SL (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. FU NIMH NIH HHS [MH-49165]; NINDS NIH HHS [NS-15830, NS-15638] NR 31 TC 31 Z9 32 U1 1 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0893-133X J9 NEUROPSYCHOPHARMACOL JI Neuropsychopharmacology PD JUN PY 1993 VL 8 IS 4 BP 371 EP 376 PG 6 WC Neurosciences; Pharmacology & Pharmacy; Psychiatry SC Neurosciences & Neurology; Pharmacology & Pharmacy; Psychiatry GA LD161 UT WOS:A1993LD16100008 PM 8512623 ER PT J AU WULFF, W AF WULFF, W TI COMPUTER-SIMULATION OF 2-PHASE FLOW IN NUCLEAR-REACTORS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 4TH JAPAN / USA SEMINAR ON TWO-PHASE FLOW DYNAMICS CY JUL 05-11, 1992 CL BERKELEY, CA SP NATL SCI FDN, JAPAN SOC PROMOT SCI, UNIV CALIF BERKELEY AB Two-phase flow models dominate the requirements of economic resources for the development and use of computer codes which serve to analyze thermohydraulic transients in nuclear power plants. An attempt is made to reduce the effort of analyzing reactor transients by combining purpose-oriented modeling with advanced computing techniques. Six principles are presented on mathematical modeling and the selection of numerical methods, along with suggestions on programming and machine selection, all aimed at reducing the cost of analysis. Computer simulation is contrasted with traditional computer calculation. The advantages of run-time interactive access operation in a simulation environment are demonstrated. It is explained that the drift-flux model is better suited than the two-fluid model for the analysis of two-phase flow in nuclear reactors, because of the latter's closure problems. The advantage of analytical over numerical integration is demonstrated. Modeling and programming techniques are presented which minimize the number of needed arithmetical and logical operations and thereby increase the simulation speed, while decreasing the cost. RP WULFF, W (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENGN,UPTON,NY 11973, USA. NR 29 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1993 VL 141 IS 1-2 BP 303 EP 313 DI 10.1016/0029-5493(93)90108-L PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LN004 UT WOS:A1993LN00400024 ER PT J AU SUGANO, T TSUBOTA, H KASAI, Y KOSHIKA, N ORUI, S VONRIESEMANN, WA BICKEL, DC PARKS, MB AF SUGANO, T TSUBOTA, H KASAI, Y KOSHIKA, N ORUI, S VONRIESEMANN, WA BICKEL, DC PARKS, MB TI FULL-SCALE AIRCRAFT IMPACT TEST FOR EVALUATION OF IMPACT FORCE SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Previously, estimates of the force caused by aircraft impact into rigid structures have been determined using theoretical methods based on the aircraft's calculated mass and strength distribution. However, these methods required many assumptions to be made and they left many questions unanswered. Because of the uncertainty involved in these analytical predictions of impact force, a full-scale aircraft impact test was performed and an extensive set of response measurements was analyzed to evaluate the impact force against a rigid target. The analysis and evaluation gave an accurate impact force-time curve under the test condition and confirmed the practical use of an existing analytical method. An analysis with a lumped mass spring model also provided good agreement with the test results. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SUGANO, T (reprint author), KOBORI RES COMPLEX INC,TOKYO,JAPAN. NR 13 TC 48 Z9 56 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1993 VL 140 IS 3 BP 373 EP 385 DI 10.1016/0029-5493(93)90119-T PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LM249 UT WOS:A1993LM24900008 ER PT J AU SUGANO, T TSUBOTA, H KASAI, Y KOSHIKA, N OHNUMA, H VONRIESEMANN, WA BICKEL, DC PARKS, MB AF SUGANO, T TSUBOTA, H KASAI, Y KOSHIKA, N OHNUMA, H VONRIESEMANN, WA BICKEL, DC PARKS, MB TI LOCAL DAMAGE TO REINFORCED-CONCRETE STRUCTURES CAUSED BY IMPACT OF AIRCRAFT ENGINE MISSILES .1. TEST PROGRAM, METHOD AND RESULTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Structural damage induced by an aircraft crashing into a reinforced concrete structure includes local damage caused by the deformable engines, and global damage caused by the entire aircraft. Local damage to the target may consist of spalling of concrete from its front face together with missile penetration into it, scabbing of concrete from its rear face, and perforation of missile through it. Until now, local damage to concrete structures has been mainly evaluated by rigid missile impact tests. Past research work regarding local damage caused by impact of deformable missiles has been limited. This paper presents the results of a series of impact tests of small-, intermediate-, and full-scale engine models into reinforced concrete panels. The purpose of the tests was to determine the local damage to a reinforced concrete structure caused by the impact of a deformable aircraft engine. C1 CENT RES INST ELECT POWER IND,ABIKO,JAPAN. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SUGANO, T (reprint author), KOBORI RES COMPLEX INC,TOKYO,JAPAN. NR 36 TC 29 Z9 35 U1 1 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1993 VL 140 IS 3 BP 387 EP 405 DI 10.1016/0029-5493(93)90120-X PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LM249 UT WOS:A1993LM24900009 ER PT J AU YUAN, VW CONNOLLY, RC GARCIA, RC JOHNSON, KF SAADATMAND, K SANDER, OR SANDOVAL, DP SHINAS, MA AF YUAN, VW CONNOLLY, RC GARCIA, RC JOHNSON, KF SAADATMAND, K SANDER, OR SANDOVAL, DP SHINAS, MA TI MEASUREMENT OF LONGITUDINAL PHASE-SPACE IN AN ACCELERATED H- BEAM USING A LASER-INDUCED NEUTRALIZATION METHOD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Laser-induced neutralization of H- ions is a process that can be used to measure the longitudinal phase space of accelerated H- beams. The laser-induced neutralization diagnostic approach (LINDA) measures the longitudinal emittance of an H- beam by photoneutralizing different phase slices of beam microbunches and analyzing the energy distribution of the neutral slices. A LINDA system utilizing a pulsed laser and time-of-flight analysis has successfully measured longitudinal emittance of the 5 MeV H beam exiting the drift-tube linac of the Los Alamos Accelerator Test Stand. Design considerations associated with the LINDA laser-based emittance measuring system are given. The present LINDA system is described and its limitations are discussed. Experimental results are given from an application of the LINDA system to the measurement of longitudinal emittance growth in a drift space and following insertion into the beamline of beam transport elements comprising a single-arm funnel. A new system is proposed which uses a mode-locked laser and spectrometer to improve resolution and shorten measurement time. RP YUAN, VW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 12 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1993 VL 329 IS 3 BP 381 EP 392 DI 10.1016/0168-9002(93)91273-P PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LB441 UT WOS:A1993LB44100003 ER PT J AU HERRUP, DA CHAPMAN, L FRANCK, A GROVES, T LUBLINSKY, B AF HERRUP, DA CHAPMAN, L FRANCK, A GROVES, T LUBLINSKY, B TI A FEEDBACK MICROPROCESSOR FOR HADRON COLLIDERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A feedback microprocessor has been built for the TEVATRON. It was constructed to be applicable to hadron colliders in general. Its inputs are realtime accelerator measurements, data describing the state of the TEVATRON, and ramp tables. The microprocessor software includes a finite state machine. Each state corresponds to a specific TEVATRON operation and has a state-specific TEVATRON model. Transitions between states are initiated by the global TEVATRON clock. Each state includes a cyclic routine which is called periodically and where all calculations are performed. The output corrections are inserted onto a fast TEVATRON-wide link from which the power supplies will read the realtime corrections. We also store all of the input data and output corrections in a set of buffers which can easily be retrieved for diagnostic analysis. In this paper we will describe this device and its use to control the TEVATRON tunes as well as other possible applications. RP HERRUP, DA (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1993 VL 329 IS 3 BP 470 EP 478 DI 10.1016/0168-9002(93)91282-R PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LB441 UT WOS:A1993LB44100012 ER PT J AU BERMAN, LE HASTINGS, JB SIDDONS, DP KOIKE, M STOJANOFF, V HART, M AF BERMAN, LE HASTINGS, JB SIDDONS, DP KOIKE, M STOJANOFF, V HART, M TI DIAMOND CRYSTAL X-RAY OPTICS FOR HIGH-POWER-DENSITY SYNCHROTRON RADIATION BEAMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MONOCHROMATORS; SILICON; LINE AB Man-made perfect single crystal isotopically-enriched diamond is demonstrated to be an excellent X-ray monochromator even when subjected to the highest incident power density expected at third-generation synchrotron source undulator beam lines. Double-crystal rocking curve tests of a diamond (400) wafer exposed to an X-ray power density of 207 W/mm2 (75 W total power) revealed just 1 arc sec of induced thermal distortion integrated across the beam footprint. C1 UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. ELECTROTECH LAB,DIV QUANTUM RADIAT,TSUKUBA,IBARAKI 305,JAPAN. RP BERMAN, LE (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. RI stojanoff, vivian /I-7290-2012 OI stojanoff, vivian /0000-0002-6650-512X NR 26 TC 32 Z9 32 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 JUN 1 PY 1993 VL 329 IS 3 BP 555 EP 563 DI 10.1016/0168-9002(93)91291-T PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LB441 UT WOS:A1993LB44100021 ER PT J AU FUNSTEN, HO BARRACLOUGH, BL MCCOMAS, DJ AF FUNSTEN, HO BARRACLOUGH, BL MCCOMAS, DJ TI SHELL EFFECTS OBSERVED IN EXIT CHARGE-STATE DISTRIBUTIONS OF 1-30 KEV ATOMIC PROJECTILES TRANSITING ULTRATHIN CARBON FOILS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB We have investigated the exit charge state distributions of 1-30 keV H, He, C, N, O, Ne and Ar ions that transit ultrathin carbon foils (average thickness of approximately 44 angstrom). The empirical charge state distributions are used to examine the ratio of the electron loss cross section sigma(l) for neutrals to the electron capture cross section sigma(c) for positive ions. The ratio, sigma(l)/sigma(c), is shown to have a quadratic dependence on the projectile velocity and inverse dependence on Z2/3 where Z is the projectile atomic number. The data is fit to the equation A(E(F) - E(T))/mZ2/3 where E(F) is the exit projectile energy, m is its mass, and A and E(T) are constants. A pronounced shell effect is observed: the constant A is dependent on the principal quantum number of the projectile, and E(T) exhibits variations with the projectile outer shell electronic structure. RP FUNSTEN, HO (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 20 TC 19 Z9 19 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 JUN PY 1993 VL 80-1 BP 49 EP 52 DI 10.1016/0168-583X(93)96074-M PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000013 ER PT J AU DELARUBIA, TD CARO, A SPACZER, M JANAWAY, GA GUINAN, MW VICTORIA, M AF DELARUBIA, TD CARO, A SPACZER, M JANAWAY, GA GUINAN, MW VICTORIA, M TI RADIATION-INDUCED DISORDERING AND DEFECT PRODUCTION IN CU3AU AND NI3AL STUDIED BY MOLECULAR-DYNAMICS SIMULATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY SP MAX PLANCK INST KERNPHYS HEIDELBERG, KERNFORSCHUNGSZENTRUM KARLSRUHE, UNIV HEIDELBERG, MAX PLANCK GESELL, MINIST WISSENSCH & KUNST LANDES BANDEN-HEMBERG, DEUT FORSCHUNGSGEMEINSCH, EUROPEAN MAT RES SOC, INT UNION PURE & APPL PHYS, ANATECH, BAYER ID DISPLACEMENT CASCADES; THERMAL SPIKES; METALS; CU AB We use molecular dynamics computer simulations to investigate the kinetics of disordering induced by energetic displacement cascades in two ordered intermetallics, Cu3Au and Ni3Al. We also study the mechanisms of defect production in these systems and compare the results to recent findings in pure metals. We employ embedded atom Potentials which reproduce the main features of the phase diagram, including a disordering transition below the melting point (T(m)) in Cu3Au and an ordered compound up to T(m) in Ni3Al. We simulate events with 5 keV recoil energy in crystals containing up to 157216 atoms at 10 K. We present results of the influence of the displacement cascade on the order parameters and describe their temporal and spatial evolution. We discuss atomic mixing in the cascade regions in terms of the atomic mobilities in each sublattice. The influence of the ordering energy and the melting temperature in the behavior of the compounds is emphasized. C1 PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RP DELARUBIA, TD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 TC 20 Z9 20 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 80-1 BP 86 EP 90 DI 10.1016/0168-583X(93)96081-M PN 1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000020 ER PT J AU RUCK, DM BOOS, D BROWN, IG AF RUCK, DM BOOS, D BROWN, IG TI IMPROVEMENT IN WEAR CHARACTERISTICS OF STEEL TOOLS BY METAL-ION IMPLANTATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY SP MAX PLANCK INST KERNPHYS HEIDELBERG, KERNFORSCHUNGSZENTRUM KARLSRUHE, UNIV HEIDELBERG, MAX PLANCK GESELL, MINIST WISSENSCH & KUNST LANDES BANDEN-HEMBERG, DEUT FORSCHUNGSGEMEINSCH, EUROPEAN MAT RES SOC, INT UNION PURE & APPL PHYS, ANATECH, BAYER AB The annual economic loss induced by wear damage of steel tools is estimated to be DM 34 billion. Ion implantation is known to be a promising method for improving the wear behaviour of metal surfaces. The effect of nitrogen implantation into steel has been investigated by a number of workers and good results have been obtained for several types of steel, especially for steel with high chromium content. However, few investigations of the effect of metal ion implantation into steel have been made. We have investigated the effect of metal ion implantation into high speed steel dies, using high current metal ion beams from a repetitively pulsed vacuum arc ion source. The testing method was, the upsetting, which is comparable to actual forming processes and simulates the wear strain of the tools used in the metal forming industry. Here we describe the metal ion implantation facility and the wear testing apparatus and procedure, and discuss the results we have obtained. C1 INST UMFORMTECH,W-7000 STUTTGART,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP RUCK, DM (reprint author), GESELL SCHWERIONENFORSCH MBH,PF 110552,W-6100 DARMSTADT 11,GERMANY. NR 9 TC 12 Z9 12 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 JUN PY 1993 VL 80-1 BP 233 EP 236 DI 10.1016/0168-583X(93)96113-Q PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000052 ER PT J AU YAO, XY KUMAI, CS DEVINE, TM FOJAS, PB IVANOV, IC YU, KM BROWN, IG AF YAO, XY KUMAI, CS DEVINE, TM FOJAS, PB IVANOV, IC YU, KM BROWN, IG TI THE PITTING CORROSION BEHAVIOR OF ALUMINUM ION-IMPLANTED WITH TITANIUM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY SP MAX PLANCK INST KERNPHYS HEIDELBERG, KERNFORSCHUNGSZENTRUM KARLSRUHE, UNIV HEIDELBERG, MAX PLANCK GESELL, MINIST WISSENSCH & KUNST LANDES BANDEN-HEMBERG, DEUT FORSCHUNGSGEMEINSCH, EUROPEAN MAT RES SOC, INT UNION PURE & APPL PHYS, ANATECH, BAYER ID FACILITY AB The pitting corrosion behavior in deaerated 0.05M NaCl solution of titanium ion implanted aluminum has been investigated. The samples were implanted with Ti ions using a Mevva high current metal ion implantation facility at doses ranging from 2 x 10(15) to 2 x 10(17) ions/cm2 and with ion energy from 30 to 120 keV, and the resultant Ti depth profiles were measured with Rutherford backscattering spectrometry (RBS). The pit density was decreased by up to two orders of magnitude relative to the unimplanted samples. The pitting potential increase ranged from 0.1 to 0.3 V. The pitting potential increase of the high dose samples was limited by pit formation at pre-existing scratches whereas the majority of the surface was free of pits to potentials up to 5 V(SCE). C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. CHARLES EVANS & ASSOCIATES,REDWOOD CITY,CA 94063. RP YAO, XY (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 10 TC 8 Z9 9 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 JUN PY 1993 VL 80-1 BP 267 EP 270 DI 10.1016/0168-583X(93)96121-R PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000060 ER PT J AU HIRVONEN, JP NASTASI, M JERVIS, TR ZOCCO, TG AF HIRVONEN, JP NASTASI, M JERVIS, TR ZOCCO, TG TI THE EFFECT OF PREIMPLANTATION AND POSTIMPLANTATION OF CARBON ON THE PHASE-FORMATION AND SURFACE MECHANICAL-PROPERTIES OF AN ION-BEAM MIXED FE-TI MULTILAYERED SYSTEM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY SP MAX PLANCK INST KERNPHYS HEIDELBERG, KERNFORSCHUNGSZENTRUM KARLSRUHE, UNIV HEIDELBERG, MAX PLANCK GESELL, MINIST WISSENSCH & KUNST LANDES BANDEN-HEMBERG, DEUT FORSCHUNGSGEMEINSCH, EUROPEAN MAT RES SOC, INT UNION PURE & APPL PHYS, ANATECH, BAYER ID STAINLESS-STEEL; MICROSTRUCTURE; FILMS AB The phase formation and its impact on the surface mechanical properties was studied in the Fe-Ti multilayered structures which were implanted with carbon either before or after ion beam mixing with Kr ions. Carbon implantation prior to the ion beam mixing was found to favor the formation of titanium carbide, whereas the amount of amorphous Fe-Ti-C phase was higher in the sample which was first ion beam mixed. This was explained to be consistent with a simple criterion of thermodynamical stability. The observed changes in the microstructure were not reflected by the nanoindentation hardness measurements and friction but correlated with the type of damage on the wear track. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP HIRVONEN, JP (reprint author), TECH RES CTR FINLAND,MET LAB,SF-02151 ESPOO,FINLAND. NR 13 TC 4 Z9 4 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 JUN PY 1993 VL 80-1 BP 398 EP 403 DI 10.1016/0168-583X(93)96148-6 PN 1 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000087 ER PT J AU ALEXANDER, DE BALDO, PM REHN, LE AF ALEXANDER, DE BALDO, PM REHN, LE TI DIFFUSION-INDUCED GRAIN-BOUNDARY MIGRATION DURING ION-BEAM MIXING OF AU/CU BILAYERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID FILMS AB Experiments were performed to evaluate the effect of 1.5 MeV Kr irradiation on diffusion-induced grain boundary migration (DIGM) in Au/Cu bilayers in the temperature range of 300 less-than-or-equal-to T less-than-or-equal-to 550 K. The experimental results were consistent with DIGM occurring in bilayers both during irradiation and during annealing treatments. Rutherford backscattering spectrometry showed a nearly uniform distribution of Cu present through the entire thickness of appropriately prepared polycrystalline Au films irradiated or annealed at temperatures greater-than-or-equal-to 400 K. No parallel effect was seen in similarly treated single-crystal films. In each polycrystalline sample studied, irradiation resulted in greater amounts of Cu present uniformly in the Au compared to annealing-only. The magnitudes of measured Cu compositions were substantially greater than that expected solely from grain boundary diffusion. A simple analysis of the process indicated that ion irradiation affects DIGM by increasing the composition of Cu present in alloyed zones and/or by increasing the grain boundary velocities in the Au. RP ALEXANDER, DE (reprint author), ARGONNE NATL LAB, DIV MAT SCI, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 80-1 BP 412 EP 416 DI 10.1016/0168-583X(93)96151-2 PN 1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000090 ER PT J AU CHASON, E MAYER, TM MCILROY, D MATZKE, CM AF CHASON, E MAYER, TM MCILROY, D MATZKE, CM TI ION-BOMBARDMENT OF SIO2/SI AND SI MEASURED BY IN-SITU X-RAY REFLECTIVITY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY AB We have used in situ energy dispersive X-ray reflectivity to measure the evolution of struCture and morphology during ion bombardment of thin films of SiO2 on Si and of clean Si. The high resolution of this technique (0.3 nm in film thickness and 0.04 nm in surface roughness) makes it possible to resolve thin film structures that are difficult to detect by other means, while the reasonably short acquisition time ( < 1000 s per spectrum) makes it possible to study the kinetics of layer modification. We present measurements of low-energy (600-1000 eV) ion bombardment which demonstrate the ability of the technique to resolve very shallow ( < 4 nm) implanted regions. We also compare the kinetics of surface roughening by reactive H ions and inert Xe ions on an amorphous oxide (SiO2) With that on a crystalline semiconductor (Si, Ge). H ions were observed to smoothen SiO2 surfaces that were made rough by prior Xe ion bombardment. Details of the energy dispersive technique and its benefits for in situ measurements are described. RP CHASON, E (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 6 Z9 6 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 JUN PY 1993 VL 80-1 BP 742 EP 746 DI 10.1016/0168-583X(93)90672-S PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100003 ER PT J AU DESIMONI, J BEHAR, M BERNAS, H LIN, XW LILIENTALWEBER, Z WASHBURN, J AF DESIMONI, J BEHAR, M BERNAS, H LIN, XW LILIENTALWEBER, Z WASHBURN, J TI ION-BEAM-INDUCED SIMULTANEOUS EPITAXIAL-GROWTH OF ALPHA AND CUBIC FESI2 IN SI(100) AT 320-DEGREES-C SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID SILICON; BETA-FESI2; FILMS AB By combining room temperature Fe ion implantation in Si (100) at concentrations of 2-18 at.% with 500 keV Si ion beam-induced epitaxial crystallization at 320-degrees-C, we have simultaneously synthesized the cubic and the tetragonal FeSi2 phases. Structural characterization was performed by cross-sectional transmission electron microscopy, Rutherford backscattering spectroscopy and ion channeling. The epitaxial relations to the Si matrix were determined. The results indicate the importance of the interfacial energy for the formation of the alpha-phase whose equilibrium formation temperature is above 950-degrees-C. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP DESIMONI, J (reprint author), CTR SPECTROMETRIE NUCL & SPECTROMETRIE MASSE,BATIMENT 108,F-91405 ORSAY,FRANCE. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 18 TC 6 Z9 6 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 JUN PY 1993 VL 80-1 BP 755 EP 758 DI 10.1016/0168-583X(93)90675-V PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100006 ER PT J AU DALEY, RS MUSKET, RG AF DALEY, RS MUSKET, RG TI HIGH-DOSE IMPLANTATIONS OF AL INTO SI(111) AND SI(100) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID ION-IMPLANTATION; ALUMINUM AB High dose implants of Al (0.5 x 10(18)/cm2 to 2.0 x 10(18)/cm2) into silicon substrates (T(i) = 375-degrees-C) were performed in an attempt to form a pure, monocrystalline buried layer of Al in silicon upon post-implant annealing. Nuclear reaction analysis (NRA) and Auger electron spectroscopy (AES) were used to determine the Al concentration and morphology as a function of depth. The results show a peak Al concentration of 83 at.% at a depth of almost-equal-to 350 nm for the highest dose, and the morphology of the Al is of an interconnected network of 100 at.% Al. The failure to form a continuous elemental layer is explained by the as-implanted morphology resulting from enhancement of the thermally induced precipitate coarsening rate at 375-degrees-C. The formation of large, stable, individual Al precipitates was thermodynamically favored for the implant conditions and effectively precluded coalescence into a continuous layer. RP DALEY, RS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 80-1 BP 802 EP 806 DI 10.1016/0168-583X(93)90686-Z PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100017 ER PT J AU MCHARGUE, CJ WILLIAMS, JM AF MCHARGUE, CJ WILLIAMS, JM TI ION-IMPLANTATION EFFECTS IN SILICON-CARBIDE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID CERAMICS AB Results from a program, which has existed for some years, on ion implantation effects in alpha and beta silicon carbide will be summarized. Silicon carbide is easily amorphized by ion implantation at room temperature. Amorphization as determined by Rutherford backscattering spectrometry (RBS) occurs for damage energies of about 20 eV/atom, corresponding to 0.2 to 0.3 displacements per atom (dpa), at room temperature. Implantation at higher temperatures ( almost-equal-to 500-degrees-C or above) does not produce an amorphous region for damage levels as high as 17 dpa. Recovery of damage at the subamorphous damage level is fairly complete by 1000-degrees-C. Epitaxial regrowth after amorphization occurs over a very narrow temperature range at almost-equal-to 1500-degrees-C in an almost ''explosive fashion. Damage and amorphization are accompanied by swelling of up to 15%. The hardness and elastic modulus values of amorphous SiC are 40 and 70%, respectively, of the unimplanted single crystalline values, but before amorphization, the hardness first increases during the early damage phase and then decreases upon amorphization. The oxidation and chemical etching rates of the amorphous state are higher than for crystalline material. Amorphization kinetics, annealing kinetics and property changes are broadly compatible with the idea of a critical accumulation model for amorphization. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MCHARGUE, CJ (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 23 TC 147 Z9 149 U1 2 U2 25 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 JUN PY 1993 VL 80-1 BP 889 EP 894 DI 10.1016/0168-583X(93)90703-9 PN 2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100035 ER PT J AU HAYNES, TE HOLLAND, OW AF HAYNES, TE HOLLAND, OW TI LATTICE DAMAGE IN ION-IMPLANTED SILICON-GERMANIUM ALLOYS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID SI; GE AB The damage produced in Si1-xGex alloys (0 less-than-or-equal-to x less-than-or-equal-to 1) by implantation of 70-100 keV Si-30+ has been measured as a function of temperature and fluence by ion channeling. For all compositions, the damage efficiency decreased sharply as the implant temperature was increased between room temperature and 150-degrees-C. Furthermore. the damage efficiency in alloys of intermediate compositions (0.35 less-than-or-equal-to x less-than-or-equal-to 0.5) exceeds that in Ge, especially at elevated temperatures, despite the larger cascade energy density in Ge. It is shown that this behavior can be described based on a model in which the point defect mobility is the dominant factor controlling damage retention, rather than the cascade energy density. This approach provides a framework for understanding other temperature-dependent phenomena related to damage growth in Si-Ge alloys including dose rate effects and damage saturation in MeV implantation. RP HAYNES, TE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 15 TC 5 Z9 5 U1 1 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 JUN PY 1993 VL 80-1 BP 901 EP 905 DI 10.1016/0168-583X(93)90705-B PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100037 ER PT J AU ARNOLD, GW AF ARNOLD, GW TI ION-IMPLANTATION EFFECTS IN AL2O3 - HYDRATION AND OPTICAL-ABSORPTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID SINGLE-CRYSTAL; SAPPHIRE AB Implants (Ar, Xe) into alpha-Al2O3 result in H uptake from the ambient atmosphere. The H inventories tended toward maximization at levels between 10(21) and 10(22) keV/cm3 with decreased uptake at the higher levels (10(23)-10(24) keV/cm3). Al implants showed little H incursion below 10(21) keV/cm3 followed by a near-linear increase with no saturation observed for the highest deposition values (approximately 10(23) keV/cm3). Al implants also produce anomalously large F-center concentrations due to locally high Al concentrations and track the increases established for H uptake. The optical measurements are compared with those for H implants which also yield anomalously large F-center concentrations. RP ARNOLD, GW (reprint author), SANDIA NATL LABS,DEPT 1111,ALBUQUERQUE,NM 87185, USA. NR 19 TC 3 Z9 3 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 JUN PY 1993 VL 80-1 BP 1036 EP 1039 DI 10.1016/0168-583X(93)90731-K PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100063 ER PT J AU WANG, LM BIRTCHER, RC EWING, RC AF WANG, LM BIRTCHER, RC EWING, RC TI ION IRRADIATION-INDUCED NANO-SCALE POLYCRYSTALLIZATION OF INTERMETALLIC AND CERAMIC MATERIALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID NANOPHASE AB Intermetallics such as U3Si and Zr3Al as well as many complex ceramic materials can easily be amorphized by energetic ions at room temperature. However, under certain irradiation conditions, single crystals of these materials can also be rendered polycrystalline at the nanometer scale. In this study, the transformation in Zr3Al and several ceramic materials was followed by in situ transmission electron microscopy (TEM) during 1.5 MeV Kr ion irradiations using the HVEM-Tandem Facility at Argonne National Laboratory and examined in detail by high resolution TEM (HRTEM) after the irradiations. Irradiations of Zr3Al single crystals to 8.5 x 10(15) ionS/cm2 at approximately 450-degrees-C resulted in a polycrystalline microstructure with grain sizes on the order of 10 nm. Similar phenomenon was observed in irradiated PLZT 9/65/35 [(Pb0.91La0.09XZr0.65Ti0.35)O3] single crystal with additional cavity formation. Randomly oriented nano-scale crystallites (approximately 5 nm in dimensions) were also found in partially amorphized olivine [(Mg0.88Fe0.12)2SiO4]. After a very low ion dose (2 x 10(11) ions/cm2) and several days of aging at room temperature, a single crystalline neptunite [Na2KLi(Fe, Mn)2Ti2(SiO3)8] was converted to a nanocrystalline phase with an average grain size of approximately 8 nm. The irradiation-induced nano-scale polycrystallization of these materials is suggested to be the result of the competition between amorphization and crystalline recovery. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60039. RP WANG, LM (reprint author), UNIV NEW MEXICO,DEPT EARTH & PLANETARY SCI,ALBUQUERQUE,NM 87131, USA. NR 15 TC 18 Z9 19 U1 1 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 JUN PY 1993 VL 80-1 BP 1109 EP 1113 DI 10.1016/0168-583X(93)90747-T PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100079 ER PT J AU RAMOS, SMM CANUT, B BRENIER, R GEA, L ROMANA, L BRUNEL, M THEVENARD, P AF RAMOS, SMM CANUT, B BRENIER, R GEA, L ROMANA, L BRUNEL, M THEVENARD, P TI ELECTRICAL-CONDUCTIVITY IN NIOBIUM IMPLANTED TIO2 RUTILE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID MGO AB Single crystals of TiO2 rutile were implanted at 300 K with niobium ions at fluences in the range 5 x 10(13) to 2.5 x 10(17) ions cm-2, corresponding to a mean local concentration of 6 x 10(18) to 3 x 10(22) Nb cm-3, respectively. Rutherford backscattering spectroscopy (RBS) in channeling geometry and X-ray photoemission spectroscopy (YPS) have been performed to determine the Nb substitutional fraction and the Nb oxidation state as a function of fluence. The microstructural evolution has been followed by X-ray diffraction at glancing incidence. The dc conductivity measurements were performed using the four probes technique in the temperature range of 150 to 850 K. The conductivity as a function of the Nb fluence exhibits two different behaviours: (i) at low fluence,between 5 x 10(13) and 5 x 10(14) Nb cm-2, the conductivity increases by four orders of magnitude, (ii) while at high fluence, between 5 x 10(15) and 2.5 x 10(17) Nb cm-2, it varies slowly from 10(2) to 2 x 10(3) OMEGA-1cm-1. The conductivity is thermally activated and the activation energy deduced from Arrhenius plots (sigma is-proportional-to (1/T)) depends on the local concentration of implanted niobium. It decreases from 0.12 eV (5 x 10(14) Nb cm-2) to 0.01 eV (2.5 x 10(17) Nb cm-2). A high oxidation state of niobium was observed at low fluences and the conductivity could be described by a polaron process. At high fluences the niobium oxidation state vanishes and then a hopping process between metallic clusters is superimposed on the polaron mechanism. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. LAB CRISTALLOG GRENOBLE, CNRS, F-38042 GRENOBLE, FRANCE. RP UNIV LYON 1, DEPT PHYS MAT, CNRS, URA 172, F-69622 VILLEURBANNE, FRANCE. NR 16 TC 13 Z9 13 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X EI 1872-9584 J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 80-1 BP 1123 EP 1127 DI 10.1016/0168-583X(93)90750-Z PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100082 ER PT J AU MARWICK, AD CIVALE, L KRUSINELBAUM, L WHEELER, R THOMPSON, JR WORTHINGTON, TK KIRK, MA SUN, YR KERCHNER, HR HOLTZBERG, F AF MARWICK, AD CIVALE, L KRUSINELBAUM, L WHEELER, R THOMPSON, JR WORTHINGTON, TK KIRK, MA SUN, YR KERCHNER, HR HOLTZBERG, F TI PROCESSING HIGH-T(C) SUPERCONDUCTORS WITH GEV HEAVY-IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID HIGH-TC SUPERCONDUCTORS; CU-O CRYSTALS; IRREVERSIBILITY LINE; IRRADIATION; YBA2CU3O7-DELTA; FILMS; TRANSPORT AB Irradiation of high-T(c) superconducting crystals with low doses (10(10)-10(11) ions/cm2) of GeV heavy ions produces a unique microstructure consisting of discrete amorphous columns which are only a few nm in diameter but tens of mum long. It has been found recently that this columnar microstructure causes larger increases in magnetization and critical current at high temperature and high magnetic field than other types of defects in these materials. This can be understood as a consequence of the effective pinning of magnetic vortex lines provided by the columnar defects. Measurements confirm that the pinning is strongest when the magnetic field is aligned with the ion tracks. Differences in the pinning in different materials can be related to differences in their anisotropy, which affects the structure of the vortices and their pinning at columnar defects. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MARWICK, AD (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. NR 36 TC 18 Z9 18 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 JUN PY 1993 VL 80-1 BP 1143 EP 1149 DI 10.1016/0168-583X(93)90753-S PN 2 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100085 ER PT J AU YAO, XY FOJAS, PB BROWN, IG RUBIN, MD AF YAO, XY FOJAS, PB BROWN, IG RUBIN, MD TI MODIFICATION OF THE OPTICAL-SPECTRA OF GLASS BY METAL-ION IMPLANTATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID FACILITY AB We have carried out some exploratory investigations of the effect of metal ion implantation on the optical transmission characteristics of glass. The implants were done using the vacuum-arc-based high current metal ion implantation facility developed at Berkeley. The implanted doses were from 3 x 10(16) to 1 X 10(17) CM-2 and the energy was mostly 60 keV. A range of different metal ion species was used, including C, Al, Si, Ti, Fe, Ni, Cu, Y, Ag, Pt and Au. We used soda lime-silica glass (window glass), boron-silica glass (microscope slides), and tin oxide coated glass. The transmission of the glass samples to optical radiation in the wavelength range 300 to 2400 nm was measured. Here we outline the procedure and describe the results of the optical transmission measurements. RP YAO, XY (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 5 TC 16 Z9 17 U1 1 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 JUN PY 1993 VL 80-1 BP 1171 EP 1173 DI 10.1016/0168-583X(93)90758-X PN 2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100090 ER PT J AU MAZZOLDI, P TRAMONTIN, L BOSCOLOBOSCOLETTO, A BATTAGLIN, G ARNOLD, GW AF MAZZOLDI, P TRAMONTIN, L BOSCOLOBOSCOLETTO, A BATTAGLIN, G ARNOLD, GW TI SUBSTRATE EFFECTS IN SILVER-IMPLANTED GLASSES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID ALUMINA-SILICA GLASS; ION-IMPLANTATION AB Silicate glasses of different composition were implanted with silver and silver + nitrogen ions. Silver depth concentration profiles were measured by Rutherford backscattering spectrometry (RBS) and were found to depend on the glass substrate. The formation of silver-colloidal particles was detected by optical absorption: their aggregation behaviour was different depending on the different substrates. The effect of the radiation damage was investigated in the soda-lime glass by implanting argon before implanting silver. C1 ECP,I-30175 PORTO MARGHERA,ITALY. SANDIA NATL LABS,DEPT 1111,ALBUQUERQUE,NM 87185. DIPARTIMENTO CHIM FIS,I-30123 VENICE,ITALY. RP MAZZOLDI, P (reprint author), DIPARTIMENTO FIS,VIA MARZOLO 8,I-35131 PADUA,ITALY. RI Battaglin, Giancarlo/H-7792-2015 OI Battaglin, Giancarlo/0000-0003-1380-4465 NR 17 TC 37 Z9 37 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 JUN PY 1993 VL 80-1 BP 1192 EP 1196 DI 10.1016/0168-583X(93)90764-W PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100096 ER PT J AU BRENIER, R CANUT, B GEA, L RAMOS, SMM THEVENARD, P RANKIN, J ROMANA, L BOATNER, LA AF BRENIER, R CANUT, B GEA, L RAMOS, SMM THEVENARD, P RANKIN, J ROMANA, L BOATNER, LA TI PLASTIC-FLOW INDUCED BY IONIZATION PROCESSES IN ION-DAMAGED MGO SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY AB The change in mechanical properties induced by ionizing radiation in pre-implanted MgO single crystals has been investigated by surface-strain measurements and defect characterization. Optically polished, oriented MgO substrates were implanted with 500 keV Xe+ ions followed by 2 MeV He+ ion bombardment at fluences up to 1.5 x 10(16) He+/cm2. In order to use RBS to study the atomic migration accompanying the strain, some MgO samples were implanted with 150 keV Ca+ ''marker'' ions and were then irradiated with 2 MeV He+ ions. The defects induced in the material were analyzed before and after each type of irradiation by using RBS channeling and optical absorption. It appears that the ionizing radiation induces an out-of-plane strain composed of a volume expansion and a plastic flow which relax the stress in the pre-implanted layer. No long-range atomic migration appears to be involved in this effect. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BRENIER, R (reprint author), UNIV LYON 1,DEPT PHYS MAT,CNRS,URA 172,F-69622 VILLEURBANNE,FRANCE. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 11 TC 10 Z9 10 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 JUN PY 1993 VL 80-1 BP 1210 EP 1214 DI 10.1016/0168-583X(93)90768-2 PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100100 ER PT J AU WEBER, WJ HESS, NJ AF WEBER, WJ HESS, NJ TI ION-BEAM MODIFICATION OF GD2TI2O7 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID SELF-RADIATION DAMAGE; CRYSTAL-STRUCTURES; BOMBARDMENT AB Irradiation of Gd2Ti2O7 With 3 MeV Ar+ ions results in expansion of the unit cell volume and irradiation-induced amorphization. The damage cross section for amorphization determined from X-ray diffraction data is 0.023 nm2. Transmission electron microscopy and electron diffraction confirm the irradiation-induced amorphous character at high fluences. Raman spectroscopy indicates a decrease in scattered intensity and an increase in linewidth with fluence for the principal vibrational modes, consistent with increasing irradiation-induced disorder. The wave number of the most intense Raman peak at approximately 310 cm-1 (attributed to the O-Gd-O bending mode) decreases with fluence, indicating a change in bond angle. The increase with fluence in the wave number of the Raman peak at approximately 515 cm-1 (attributed to the Gd-O stretching mode) suggests a decrease in this bond length. At intermediate fluences, a forbidden peak at approximately 765 cm-1 becomes slightly activated by irradiation-induced disorder on the cation sites. 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 18 TC 25 Z9 25 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 JUN PY 1993 VL 80-1 BP 1245 EP 1248 DI 10.1016/0168-583X(93)90776-3 PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100108 ER PT J AU BROWN, IG ANDERS, A ANDERS, S DICKINSON, MR IVANOV, IC MACGILL, RA YAO, XY YU, KM AF BROWN, IG ANDERS, A ANDERS, S DICKINSON, MR IVANOV, IC MACGILL, RA YAO, XY YU, KM TI PLASMA SYNTHESIS OF METALLIC AND COMPOSITE THIN-FILMS WITH ATOMICALLY MIXED SUBSTRATE BONDING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY ID SOURCE ION-IMPLANTATION; SURFACE MODIFICATION; ARC PLASMA; DEPOSITION AB A method for the plasma synthesis of metallic and composite thin films with atomically mixed interfaces is described. A large number of metal species can be applied and surface structures can be fabricated including films of metals and alloys, compounds including ceramics, and tailored multilayers. The added species can be energetically implanted below the surface or built up as a surface film with an atomically mixed interface with the substrate. A vacuum arc produced metal plasma is used, and by adding a gas to the plasma region compound films can also be formed. The process parameters can be varied to fabricate a wide range of surface structures at the atomic level. We have demonstrated the method by synthesizing a number of metallic films as well as oxide and nitride films, including those described here: an yttrium film on silicon with an atomically mixed transition zone; a quarter-micron thick film of Pt on and mixed into Al; an Y/Ti multilayer structure in which the first and last layers were ion stitched to the material below; and an Al2O3 film on steel with a mixed bonding layer about 1000 angstrom thick. Here we describe the background of the technique and the experimental results that we have obtained. C1 CHARLES EVANS & ASSOCIATES,REDWOOD CITY,CA 94063. RP BROWN, IG (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012; Anders, Andre/B-8580-2009; Raoux, Simone/G-3920-2016 OI Yu, Kin Man/0000-0003-1350-9642; Anders, Andre/0000-0002-5313-6505; NR 29 TC 62 Z9 62 U1 0 U2 5 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 JUN PY 1993 VL 80-1 BP 1281 EP 1287 DI 10.1016/0168-583X(93)90782-2 PN 2 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100114 ER PT J AU HAN, S PRUSSIN, SG AGER, JW PAN, LS KANIA, DR LANE, SM WAGNER, RS AF HAN, S PRUSSIN, SG AGER, JW PAN, LS KANIA, DR LANE, SM WAGNER, RS TI RADIATION-DAMAGE STUDY OF POLYCRYSTALLINE CVD AND NATURAL TYPE-IIA DIAMONDS USING RAMAN AND PHOTOLUMINESCENCE SPECTROSCOPIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY AB By employing Raman and photoluminescence spectroscopies, and transient photoconductivity, we have studied the damage caused by 5 MeV alpha-particle bombardment on both CVD and type IIa natural diamonds over the fluence range of 1.6 x 10(12) cm-2 to 8 x 10(15) cm-2. The H3 PL peak at 2.46 eV is seen and it dominates the Raman/PL spectra for fluences greater than 1 x 10(14) cm-2. By introducing additional trapping/recombination centers into the diamond films via atomic displacements, dramatic changes in electrical properties are observed. The effects of polycrystallinity on radiation damage in CVD diamond relative to single-crystal, natural diamond are discussed. C1 LOS ALAMOS NATL LAB,DIV ELECTR,LOS ALAMOS,NM 87545. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,LASER PROGRAM,BERKELEY,CA 94720. RP HAN, S (reprint author), UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720, USA. OI Ager, Joel/0000-0001-9334-9751 NR 14 TC 11 Z9 11 U1 2 U2 8 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 JUN PY 1993 VL 80-1 BP 1446 EP 1450 DI 10.1016/0168-583X(93)90817-P PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK381 UT WOS:A1993LK38100149 ER PT J AU DEVENEY, EF KESSEL, QC FULLER, RJ REAVES, MP SHAFROTH, SM JONES, N AF DEVENEY, EF KESSEL, QC FULLER, RJ REAVES, MP SHAFROTH, SM JONES, N TI POSSIBLE 2-ELECTRON EXCITATIONS IN C-3+ FOLLOWING 1 MEV/U COLLISIONS WITH ATOMIC TARGETS - Z = 2, 10, 18 AND 36 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID HE TARGETS; IONS AB Auger electrons emitted from Li-like carbon projectiles excited during 1 MeV/u collisions with atomic targets (Z = 2, 10, 18 and 36) have been measured. As a function of the target Z, we observe the yields of singly and doubly excited autoionizing (AI) configurations of C3+ excited during the collision that decay to the {1s2(1S)+e(c)l(c)}2L ground state. The investigation focuses on Auger electrons emitted with energies between 220 and 260 eV in the projectile reference frame. In addition to the singly excited (1s2s2l)2L AI configurations expected from projectile Is electron excitation, doubly excited states to the {1s(2p2)1D)2D and {1s(2p2)1S}2S are also observed with increasing intensities in going from He to the higher Z targets. If the 2D and the 2S peaks are the result of two-electron excitations, it may be possible to investigate this aspect of the collision using some of the recent approaches taken in studying the excitations of the two electrons in He targets. C1 UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC 27599. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269. RP DEVENEY, EF (reprint author), UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 8 EP 10 DI 10.1016/0168-583X(93)95272-7 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400006 ER PT J AU VANE, CR DATZ, S DITTNER, PF KRAUSE, HF SCHUCH, R GAO, H HUTTON, R AF VANE, CR DATZ, S DITTNER, PF KRAUSE, HF SCHUCH, R GAO, H HUTTON, R TI KNOCK-ON ELECTRONS PRODUCED IN COLLISIONS OF 6.4-TEV SULFUR IONS WITH FIXED TARGETS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB We have studied angular and momentum distributions of secondary electrons ejected in direct, Coulomb collisions of 6.4 TeV sulfur ions with electrons in thin targets of polypropylene (CH2)x, Al, and Au. Comparisons are presented here of knock-on electron data with calculations based on Born approximation differential cross sections for a point nucleus colliding with free electrons. With some noted exceptions, we find good agreement between experiment and theory. C1 MANNE SIEGBAHN INST,STOCKHOLM,SWEDEN. LUND UNIV,S-22101 LUND,SWEDEN. RP VANE, CR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 5 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 26 EP 29 DI 10.1016/0168-583X(93)95276-B PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400010 ER PT J AU KELLER, N MILLER, RD WESTERLIND, M ANDERSSON, LR ELSTON, SB SELLIN, IA BIEDERMANN, C CEDERQUIST, H AF KELLER, N MILLER, RD WESTERLIND, M ANDERSSON, LR ELSTON, SB SELLIN, IA BIEDERMANN, C CEDERQUIST, H TI ANGULAR-DISTRIBUTIONS OF CHARGE-EXCHANGE COLLISIONS AT VERY-LOW ENERGIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID DOUBLE-ELECTRON-CAPTURE; 2-ELECTRON CAPTURE; C-4+; HE; SINGLE AB We have measured angular distributions of double-electron capture in C4+-->He collisions at energies between 400 and 800 eV. The experimental energy-gain spectra show that the ground state of C2+ (1S2 2S2) is populated. In the angular distributions we observe an interference pattern which is attributed to Stueckelberg oscillations. The presented results are compared to experimental data as well as to theoretical calculations by other authors. C1 MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KELLER, N (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 52 EP 54 DI 10.1016/0168-583X(93)95283-B PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400017 ER PT J AU SCHUCH, R QUINTEROS, T PAJEK, M HARUYAMA, Y DANARED, H HUI, G ANDLER, G SCHNEIDER, D STARKER, J AF SCHUCH, R QUINTEROS, T PAJEK, M HARUYAMA, Y DANARED, H HUI, G ANDLER, G SCHNEIDER, D STARKER, J TI RADIATIVE RECOMBINATION OF LOW-ENERGY WITH DEUTERONS IN CRYRING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID ELECTRON AB A measurement of radiative recombination rates of electrons with deuterons at low relative energies of meV up to 10 eV is reported. Deuterons of 2.6 and 5.6 MeV/amu were stored and cooled in CRYRING with a lifetime of more than 20 h. The lifetime is determined by large angle elastic scattering at residual gas molecules. The effect of field ionization of high n-states in the motional electric field in the ring dipole magnet on the radiative recombination rate is discussed. C1 PEDAGOG UNIV,KIELCE,POLAND. PREFECTURAL UNIV KYOTO,KYOTO,JAPAN. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SCHUCH, R (reprint author), MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN. NR 11 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 59 EP 63 DI 10.1016/0168-583X(93)95285-D PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400019 ER PT J AU DUBOIS, RD MANSON, ST AF DUBOIS, RD MANSON, ST TI ELECTRON-ELECTRON INTERACTIONS IN FAST NEUTRAL-NEUTRAL COLLISIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID HYDROGEN; ATOM AB Differential electron emission is studied for 50-500 keV H+ and H atom impact on helium. Using the first Born formulation, it is shown that projectile electron-target electron interactions are expected to dominate the differential cross sections for low energy target electron emission induced by fast neutral projectile impact on any target. Measurements of the 15-degrees electron emission were made in order to investigate this prediction. For low impact energies, a constant ratio between the hydrogen atom and proton impact cross sections was found for emitted electron velocities less than half the projectile velocity, V(p). But as the collision energy increased, for electron velocities less than 0.25V(p), the cross section ratio increased as the emitted electron velocity decreased. This is interpreted as a signature of projectile electron-target electron interactions becoming dominant for distant collisions between neutral particles. C1 GEORGIA STATE UNIV, DEPT PHYS & ASTRON, ATLANTA, GA 30303 USA. RP DUBOIS, RD (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 9 TC 5 Z9 5 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 JUN PY 1993 VL 79 IS 1-4 BP 93 EP 96 DI 10.1016/0168-583X(93)95294-F PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400028 ER PT J AU MELLES, M REINHOLD, CO BURGDORFER, J AF MELLES, M REINHOLD, CO BURGDORFER, J TI CLASSICAL AND QUANTUM DYNAMICS OF THE IMPULSIVELY DRIVEN HYDROGEN-ATOM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID RYDBERG STATES; COLLISIONS; IONIZATION; FIELD AB We investigate the classical and quantum dynamics of the hydrogen atom in a Rydberg state subject to a sequence of periodic and random pulses. One goal of this study is to test the validity of classical electron transport theories. We analyze the critical momentum transfer for which 10% of the Rydberg atoms are ionized after a large number of pulses as a function of the frequency of the perturbation. The quantum mechanical results for a periodic sequence of pulses exhibit clear structures which are not present in a classical simulation. These structures are shown to vanish for the case of stochastic pulses for which agreement is obtained between the classical and quantum mechanical results. The dynamics of the quantum mechanical periodic system is analyzed in terms of quasi-eigenstates of the period-one time evolution operator. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MELLES, M (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 10 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 109 EP 113 DI 10.1016/0168-583X(93)95299-K PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400033 ER PT J AU WANG, YD MCGUIRE, JH ZOUROS, TJM LEE, DH SANDERS, JM RICHARD, P AF WANG, YD MCGUIRE, JH ZOUROS, TJM LEE, DH SANDERS, JM RICHARD, P TI THEORY OF PROJECTILE IONIZATION BY MOLECULAR-HYDROGEN TARGETS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID ELECTRON-ELECTRON INTERACTION; ATOMIC-COLLISIONS; EXCITATION AB The study of events in which ionization of a projectile electron occurs together with the transition of a target electron offers an opportunity to explore the dynamics of electron-electron interaction. Experimental and theoretical investigations have isolated an effect due to the interaction of electrons associated with two different (projectile and target) centers. For a molecular hydrogen target, the role of two-center electron-electron interaction is further complicated by the two-center nature of the target. The influence of the two-center nature of the target on the two-center projectile-target electron-electron interaction is illustrated through a calculation of cross sections for projectile ionization with target molecular hydrogen being promoted into its first excited state. C1 TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. UNIV CRETE,DEPT PHYS,GR-71110 IRAKLION,GREECE. INST ELECTR STRUCT & LASER,GR-71110 IRAKLION,GREECE. BROOKHAVEN NATL LAB,DEPT APPL PHYS,UPTON,NY 11973. KANSAS STATE UNIV AGR & APPL SCI,DEPT PHYS,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 0 Z9 0 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 JUN PY 1993 VL 79 IS 1-4 BP 124 EP 127 DI 10.1016/0168-583X(93)95303-M PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400037 ER PT J AU DELLWO, J LIU, Y TANG, CY PEGG, DJ ALTON, GD AF DELLWO, J LIU, Y TANG, CY PEGG, DJ ALTON, GD TI AN INVESTIGATION OF LI- PHOTODETACHMENT IN THE VICINITY OF THE 22P+EPSILON-S THRESHOLD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A crossed laser-ion beam apparatus has been used to determine the electron affinity of Li and to measure cross sections for single photon-single electron detachment from Li-. Photoelectron production via the resolved 2Sepsilonp and 2Pepsilons channels has been studied in detail in the vicinity of the 2(2)p+epsilons threshold. The electron affinity of Li - was found to be 617.6 +/- 0.2 meV by threshold-photodetachment spectroscopy. Absolute cross sections and asymmetry parameters are also measured at discrete wavelengths in the spectral range of 1.78-2.50 eV. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP DELLWO, J (reprint author), OAK RIDGE NATL LAB,DEPT PHYS,POB 2008,OAK RIDGE,TN 37831, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 162 EP 165 DI 10.1016/0168-583X(93)95314-U PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400048 ER PT J AU CLARK, MW SCHNEIDER, DH DEVENEY, EF KESSEL, QC POLLACK, E SMITH, WW AF CLARK, MW SCHNEIDER, DH DEVENEY, EF KESSEL, QC POLLACK, E SMITH, WW TI X-RAY-EMISSION FROM BI50+ TO BI71+ IONS INCIDENT ON A GOLD SURFACE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID HIGHLY CHARGED IONS; TRAP AB Bi ions with charge states q = 50 to 71 from the Livermore National Laboratory's EBIT were accelerated to energies of q x (7 keV) and directed to a gold target. Using a Si(Li) detector, two families of X-rays were observed, one of these in the range of 750-2000 eV and the other between 2500 and 6000 eV. Both families are found to shift to higher energies with increasing incident ion charge state. The lower energy group which dominates the spectra for lower incident charge states is attributed to the filling of vacancies in the N shell while the higher energy group, which predominates for the higher incident charge states, is attributed to the filling of M-shell vacancies. M X-rays are observed even for those incident charge states for which M vacancies are not expected. A similar result observed for U ions incident upon a Be target was attributed by Schuch and coworkers to a dielectronic excitation mechanism. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269. UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269. NR 9 TC 4 Z9 4 U1 1 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 JUN PY 1993 VL 79 IS 1-4 BP 183 EP 185 DI 10.1016/0168-583X(93)95320-5 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400054 ER PT J AU CIPOLLA, SJ REED, KJ AF CIPOLLA, SJ REED, KJ TI MOLECULAR-ORBITAL ANALYSIS OF L X-RAY CROSS-SECTIONS MEASURED FOR SLOW AR-CU COLLISIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID ION-ATOM COLLISIONS; MODEL AB X-ray production cross sections were determined from thick target analysis of the Ar and Cu L X-ray yields measured for 80-600 keV Ar ions impacting on solid Cu. The Cu cross sections are compared with calculated 3ddelta+-3dpi+-3dsigma rotational coupling cross sections in the Ar-Cu quasimolecule, while the Ar cross sections are compared with 4fsigma electron promotion along with 3ddelta--3dpi- and 3ppi+-3psigma rotational coupling cross sections. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CIPOLLA, SJ (reprint author), CREIGHTON UNIV,DEPT PHYS,OMAHA,NE 68178, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 203 EP 205 DI 10.1016/0168-583X(93)95325-Y PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400059 ER PT J AU PITARKE, JM RITCHIE, RH ECHENIQUE, PM AF PITARKE, JM RITCHIE, RH ECHENIQUE, PM TI Z(1)(3) CORRECTION TO THE STOPPING POWER OF AN ELECTRON-GAS FOR IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID CHARGED-PARTICLES; ENERGY-LOSS; BARKAS; ANTIPROTONS; RANGE AB A diagrammatic analysis of many-body interactions between a moving ion and an electron gas is made. The Z(1)3 correction to the stopping power of the medium for the penetrating ion is derived using Feynman diagrams, and the contributing terms leading to significant Z(1)3 corrections to the stopping power at low velocities of the ion are evaluated, as a function of the velocity of the ion, in the random-phase-approximation. C1 EUSKAL HERRIKO UNIBERTSITATEA, ZIENTZI FALKULTATEA, MATERIA KONDENTSATUAREN FISIKA SAILA, E-48080 BILBAO, SPAIN. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. EUSKAL HERRIKO UNIBERTSITATEA, KIMIKA FALKULTATEA, E-20080 DONOSTIA, SPAIN. RI Pitarke, Jose/C-8602-2009 OI Pitarke, Jose/0000-0002-8253-8028 NR 23 TC 33 Z9 33 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 JUN PY 1993 VL 79 IS 1-4 BP 209 EP 212 DI 10.1016/0168-583X(93)95327-2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400061 ER PT J AU GETZOFF, ED JONES, KW MCREE, D MOFFAT, K NG, K RIVERS, ML SCHILDKAMP, W SINGER, PT SPANNE, P SWEET, RM TENG, TY WESTBROOK, EM AF GETZOFF, ED JONES, KW MCREE, D MOFFAT, K NG, K RIVERS, ML SCHILDKAMP, W SINGER, PT SPANNE, P SWEET, RM TENG, TY WESTBROOK, EM TI LAUE DIFFRACTION PROTEIN CRYSTALLOGRAPHY AT THE NATIONAL SYNCHROTRON LIGHT-SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID HALOPHILIC PHOTOTROPHIC BACTERIUM; ECTOTHIORHODOSPIRA-HALOPHILA; YELLOW PROTEIN; PHOTOGRAPHS AB A new facility for the study of protein crystal structure using Laue diffraction has been established at the X26 beam line of the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory. The characteristics of the beam line and diffraction apparatus are described. Selected results of some of the initial experiments are discussed briefly by beam line users to illustrate the scope of the experimental program. Because the Laue method permits the recording of large data sets in a single shot, one goal in establishing this facility has been to develop the means to study time-resolved structures within protein crystals. Systems being studied include: the reactions catalyzed by trypsin; photolysis of carbonmonoxy myoglobin; and the photocycle of photoactive yellow protein. C1 BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. RP GETZOFF, ED (reprint author), SCRIPPS RES INST, LA JOLLA, CA 92037 USA. NR 20 TC 12 Z9 13 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 JUN PY 1993 VL 79 IS 1-4 BP 249 EP 255 DI 10.1016/0168-583X(93)95337-5 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400071 ER PT J AU QIAN, YL TURNER, LR AF QIAN, YL TURNER, LR TI SIMULATION OF U-5 PROTOTYPE UNDULATOR EFFECTS ON THE BEAM DYNAMICS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB The APS prototype undulator U-5 has been installed at the NSLS VUV ring. Its effects on the beam behaviour have been simulated with the tracking codes TEAPOT and RACETRACK. The tune shift, the distortion of the betatron function, the chromaticity, the transverse coupling, and some of the amplitude-dependent effects on the VUV ring have been compared and are presented in this paper. RP QIAN, YL (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 256 EP 260 DI 10.1016/0168-583X(93)95338-6 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400072 ER PT J AU LEE, DH JOHNSON, BM GUARDALA, NA PRICE, JL GLASS, GA STUMBORG, MF JONES, KW AF LEE, DH JOHNSON, BM GUARDALA, NA PRICE, JL GLASS, GA STUMBORG, MF JONES, KW TI NE, AR, FE, AND CU AUGER-ELECTRON PRODUCTION AT NATIONAL SYNCHROTRON LIGHT-SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB Energetic K and L Auger electrons produced by focussed, filtered, broad-band synchrotron radiation have been measured at the X-ray ring of the National Synchrotron Light Source (NSLS). The X-ray beam was used to study inner-shell photoionization of Ne and Ar gas and Fe and Cu solid film targets. The Auger electrons were analyzed by means of a semihemispherical electrostatic electron spectrometer at the energy resolution of approximately 3%. The electrons were detected at both 90-degrees and 0-degrees with respect to the photon beam direction. Broad distributions of the inner-shell photoelectrons were also observed, reflecting the incoming photon flux distribution. The Fe and Cu K Auger electron spectra were found to be very similar to the Ar K Auger electron spectra. This was expected, since deep inner-shell Auger processes are not affected by the other valence electrons. Above 3 keV in electron energy, there have been few previous Auger electron measurements. C1 USN,CTR SURFACE WARFARE,WHITE OAK LAB,WHITE OAK,MD 20903. UNIV SW LOUISIANA,DEPT PHYS,LAFAYETTE,LA 70504. RP LEE, DH (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 14 TC 0 Z9 0 U1 1 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 JUN PY 1993 VL 79 IS 1-4 BP 261 EP 264 DI 10.1016/0168-583X(93)95339-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400073 ER PT J AU KOSTER, JE NELSON, RO SCHILLACI, ME WENDER, SA MAYO, D BRADY, FP ROMERO, J KROFCHECK, D BLANN, M ANTHONY, P BROWN, VR HANSEN, L POHL, B SANGSTER, TC NIFENECKER, H PINSTON, JA AF KOSTER, JE NELSON, RO SCHILLACI, ME WENDER, SA MAYO, D BRADY, FP ROMERO, J KROFCHECK, D BLANN, M ANTHONY, P BROWN, VR HANSEN, L POHL, B SANGSTER, TC NIFENECKER, H PINSTON, JA TI NEUTRON-PROTON BREMSSTRAHLUNG EXPERIMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB It is well known that charged particles emit bremsstrahlung radiation when they are accelerated. Classical electron bremsstrahlung occurs when a proton is emitted by an electron accelerated in the field of a nucleus. The bremsstrahlung process also occurs in the scattering of nucleons, for which it is the lowest energy inelastic process that can occur. Like electron bremsstrahlung, nucleon-nucleon bremsstrahlung also requires the exchange of a virtual particle to conserve energy and momentum. In electron bremsstrahlung a virtual photon is exchanged but with two nucleons a meson can be exchanged. Unlike electron bremsstrahlung, in nucleon-nucleon bremsstrahlung the photon can originate from the exchanged meson. This exchange contribution has been shown in calculations to be a significant fraction of bremsstrahlung events. Thus bremsstrahlung serves as a probe of exchange currents in the nucleon-nucleon interaction. Because of a lack of a free neutron target or an intense neutron beam, few measurements of neutron-proton bremsstrablung exist, each having poor statistical accuracy and poor energy resolution. The white neutron source at the Weapons Neutron Research (WNR) target area at the Los Alamos Meson Physics Facility (LAMPF) produces neutrons with energies from below 50 to above 400 MeV. Using time-of-flight techniques and a liquid hydrogen target, we are measuring the outgoing photons of energies up to 250 MeV at gamma ray angles of around 90-degrees relative to the incident beam. Protons scattered at very forward angles are also detected in coincidence with the gamma rays. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. INST SCI NUCL GRENOBLE,GRENOBLE,FRANCE. RP KOSTER, JE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 297 EP 299 DI 10.1016/0168-583X(93)95348-9 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400082 ER PT J AU HAASE, DG BOWMAN, JD DELHEIJ, PPJ FRANKLE, CM GOULD, CR KNUDSON, JN KOSTER, JE MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ YOO, SH YUAN, VW AF HAASE, DG BOWMAN, JD DELHEIJ, PPJ FRANKLE, CM GOULD, CR KNUDSON, JN KOSTER, JE MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ YOO, SH YUAN, VW TI BULK MAGNETIC-STRUCTURE STUDIES USING POLARIZED EPITHERMAL NEUTRONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID PARITY NONCONSERVATION AB Parity violating effects in the nucleus are normally very small, but in certain compound nuclear resonances such effects are enhanced to several percent, as in the 0.734 eV p-wave resonance in La-139. We have used this enhanced parity violation to measure the depolarization of neutrons traversing a thick single crystal of ferromagnetic holmium. The depolarization was dependent on the relative orientation of the neutron polarization and the holmium c crystalline axis. The effect was explained in terms of neutron precession in an array of highly correlated domains magnetized in the c axis direction. The results show the high degree of correlation of magnetic domains in the single crystal and demonstrate the usefulness of epithermal neutrons in measuring magnetic properties of thick crystals. The use of other parity violating resonances should allow polarization analysis of neutrons over a range of neutron energies. C1 TRIANGLE UNIV NUCL LAB,DURHAM,NC 27706. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. UNIV TECHNOL DELFT,2600 GA DELFT,NETHERLANDS. DUKE UNIV,DEPT PHYS,DURHAM,NC 27706. RP HAASE, DG (reprint author), N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695, USA. RI Gould, Christopher/M-7676-2013 NR 7 TC 0 Z9 0 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 JUN PY 1993 VL 79 IS 1-4 BP 300 EP 302 DI 10.1016/0168-583X(93)95349-A PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400083 ER PT J AU FRANKLE, CM BOWMAN, JD KNUDSON, JN PENTTILA, SI SEESTROM, SJ YOO, SH YUAN, VW GOULD, CR HAASE, DG MITCHELL, GE ROBERSON, NR POPOV, YP SHARAPOV, EI DELHEIJ, PPJ POSTMA, H AF FRANKLE, CM BOWMAN, JD KNUDSON, JN PENTTILA, SI SEESTROM, SJ YOO, SH YUAN, VW GOULD, CR HAASE, DG MITCHELL, GE ROBERSON, NR POPOV, YP SHARAPOV, EI DELHEIJ, PPJ POSTMA, H TI MEASUREMENT OF PARITY VIOLATION IN COMPOUND NUCLEAR RESONANCES USING EPITHERMAL POLARIZED NEUTRONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID NONCONSERVATION; LA-139 AB Polarized neutron transmission experiments show remarkable sensitivity to the presence of small symmetry violating forces in nuclear interactions. Parity-nonconserving (PNC) analyzing powers of a percent or more have been measured on p-wave neutron resonances in nuclei ranging from Br-81 to U-238. A brief summary is given of the study of PNC effects in neutron resonances. Details of ongoing polarized neutron transmission experiments are discussed and some sample data presented. Several development projects are currently under way, which taken together should improve the sensitivity of these experiments by a factor of approximately 20. Similar large PNC effects can be observed in (n, gamma) resonances with much smaller samples. A design for a near 4pi gamma ray detector to be constructed of CsI(pure) is described. C1 N CAROLINA STATE UNIV, RALEIGH, NC 27695 USA. TRIANGLE UNIV NUCL LAB, DURHAM, NC 27706 USA. DUKE UNIV, DURHAM, NC 27706 USA. JOINT NUCL RES INST, DUBNA 141980, RUSSIA. TRIUMF, VANCOUVER V6T 2A3, BC, CANADA. UNIV TECHNOL DELFT, 2600 GA DELFT, NETHERLANDS. RP FRANKLE, CM (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RI Gould, Christopher/M-7676-2013 NR 11 TC 0 Z9 0 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 JUN PY 1993 VL 79 IS 1-4 BP 306 EP 308 DI 10.1016/0168-583X(93)95351-5 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400085 ER PT J AU BINGHAM, CR ZHANG, M BECKER, JA HENRY, EA HOFF, RW KUHNERT, A STOYER, MA WANG, TF AKOVALI, YA JOSHI, P LAM, TS RUPNIK, D ZGANJAR, EF BREITENBACH, J JARRIO, M WOOD, JL CARTER, HK MANTICA, PF KORMICKI, J AF BINGHAM, CR ZHANG, M BECKER, JA HENRY, EA HOFF, RW KUHNERT, A STOYER, MA WANG, TF AKOVALI, YA JOSHI, P LAM, TS RUPNIK, D ZGANJAR, EF BREITENBACH, J JARRIO, M WOOD, JL CARTER, HK MANTICA, PF KORMICKI, J TI SEARCH FOR LOW-SPIN SUPERDEFORMED STATES IN NUCLEI SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID BAND AB Since the first discovery in 1986 of a rotational band at high angular momentum with deformation parameters near beta = 0.6, a great deal of research has been devoted to the study of these superdeformed (SD) bands in nuclei leading to the identification of similar bands in numerous nuclei in the mass 130, 150, and 190 regions. While superdeformed shape isomers have been observed at low spin in the actinides via spontaneous fission and in a few cases via gamma decay, below mass 200 the low-spin members of the SD bands have not been observed. Theoretical calculations are able to account for the relative stability of the superdeformed bands in the nuclei where they have been observed. These calculations suggest that in the Hg-Pb region the SD shape should be stable at a rotational frequency of 0. Several experiments have been performed to search for the population and decay of the lower spin members of the SD bands in the mass 190 region and some are still in progress. To this date, none has provided conclusive observation of the 0+ bandhead of a superdeformed band. The experimental techniques utilized in several of these are described. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. GEORGIA INST TECHNOL,ATLANTA,GA 30332. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. VANDERBILT UNIV,NASHVILLE,TN 37235. RP BINGHAM, CR (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 25 TC 0 Z9 0 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 JUN PY 1993 VL 79 IS 1-4 BP 309 EP 312 DI 10.1016/0168-583X(93)95352-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400086 ER PT J AU BECKER, JA HENRY, EA KUHNERT, A STOYER, MA BRINKMAN, MJ WANG, TF ROY, N CIZEWSKI, JA STEPHENS, FS DELEPLANQUE, MA DIAMOND, RM OLIVEIRA, JRB DRAPER, JE AZAIEZ, F MACCHIAVELLI, AO KORTEN, W RUBEL, E DUYAR, C KELLY, WH VO, D AF BECKER, JA HENRY, EA KUHNERT, A STOYER, MA BRINKMAN, MJ WANG, TF ROY, N CIZEWSKI, JA STEPHENS, FS DELEPLANQUE, MA DIAMOND, RM OLIVEIRA, JRB DRAPER, JE AZAIEZ, F MACCHIAVELLI, AO KORTEN, W RUBEL, E DUYAR, C KELLY, WH VO, D TI OBLATE L = 1 BANDS IN 194,196-201PB AND 193HG SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID PB ISOTOPES; HIGH SPINS; COEXISTENCE; STATES; NUCLEI AB Reports of recent experiments have included observations of regular and irregular bands in neutron deficient Pb isotopes with A = 194, 196-201. The bands are populated strongly in (HI, xn) reactions. The shared characteristics of the bands include: 1) bandhead energies of a few MeV; 2) high bandhead spin; 3) large alignments; 4) small dynamic moments of inertia, and 5) strong L = 1 transitions and weaker L = 2 crossover transitions, with B(Ml)/B(E2) almost-equal-to 20 mu2/e2 b2. Lifetimes of band members in the Pb-198 regular band are B(M1) almost-equal-to 1 W.u. and B(E2) almost-equal-to 12 W.u. (with large errors). These observations are consistent with an interpretation of the regular structures as collective oblate bands with both proton and neutron excitations involved; the closed proton shell at Z = 82 is broken, and coupled to nu(i13/2)-n excitations. The irregular structures may correspond to triaxial shapes, with similar orbits involved. A similar structure has been also found in 193Hg. C1 RUTGERS UNIV,NEW BRUNSWICK,NJ 08903. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP BECKER, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Oliveira, Jose Roberto/J-3124-2012; KORTEN, Wolfram/H-3043-2013; OI Oliveira, Jose Roberto/0000-0003-1362-7382; KORTEN, Wolfram/0000-0002-3940-0816 NR 24 TC 3 Z9 3 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 JUN PY 1993 VL 79 IS 1-4 BP 313 EP 317 DI 10.1016/0168-583X(93)95353-7 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400087 ER PT J AU KONG, Y LYNN, KG AF KONG, Y LYNN, KG TI POSITRON SPECTROMICROSCOPY WITH A SUPERCONDUCTING MAGNET SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID REEMISSION MICROSCOPE; SURFACE AB Techniques of positron microscopy have recently been developed for probing solids. Imaging in the prototype positron reemission microscopes was based on electrostatic focussing systems. We are now considering a different design based on a superconducting magnet and a magnetically guided positron beam, in which reemitted positrons or electrons from a sample placed in a strong magnetic field region are magnified by the divergent magnetic field. This technique does not require multiple remoderation of the positrons and should be practical with a benchtop beam. It has excellent energy resolving capability for spectroscopic study of the reemitted particles. We will discuss the possible applications of this setup toward positron reemission spectromicroscopy, as well as positron annihilation-induced Auger electron microscopy. It is also possible to utilize the same method for achieving a magnetically guilded positron microbeam for studying inhomogeneous or small samples. RP KONG, Y (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 10 TC 3 Z9 3 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 JUN PY 1993 VL 79 IS 1-4 BP 341 EP 344 DI 10.1016/0168-583X(93)95359-D PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400093 ER PT J AU KOSSLER, WJ GREER, AJ HULETT, LD AF KOSSLER, WJ GREER, AJ HULETT, LD TI POSITRONS AT CEBAF SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB It is estimated that about 2.5 x 10(10) slow positrons per second might be produced if 1.0 mA of 400 MeV electrons were incident on target. This estimate and some problems of target design are discussed. The electron beam structure is 1-2 ps pulses with a repitition rate of 7.5 MHz which is appropriate for a free electron laser (FEL) which is being proposed for CEBAF. The electron beam would exit the FEL and would otherwise be transported to a beam dump. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KOSSLER, WJ (reprint author), COLL WILLIAM & MARY,WILLIAMSBURG,VA 23187, USA. NR 3 TC 5 Z9 5 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 JUN PY 1993 VL 79 IS 1-4 BP 345 EP 348 DI 10.1016/0168-583X(93)95360-H PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400094 ER PT J AU SCHRAGE, DL YOUNG, LM CLARK, WL BILLEN, JH DEPAULA, RF NARANJO, AC NEUSCHAEFER, GH ROYBAL, PL STOVALL, JE RAY, K RICHTER, R AF SCHRAGE, DL YOUNG, LM CLARK, WL BILLEN, JH DEPAULA, RF NARANJO, AC NEUSCHAEFER, GH ROYBAL, PL STOVALL, JE RAY, K RICHTER, R TI RADIO-FREQUENCY QUADRUPOLE LINAC FOR THE SUPERCONDUCTING SUPER COLLIDER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A 2.5 MeV, 428 MHz radio frequency quadrupole (RFQ) linac has been designed and fabricated by the Los Alamos National Laboratory and GAR Electroforming for the Superconducting Super Collider Laboratory. This device is a two segment accelerator fabricated from tellurium-copper (CDA14500) vane/cavity quadrants which are joined by electroforming. The structure incorporates an integral vacuum jacket and has no longitudinal rf or mechanical joints. The SSC RFQ linac is an extension of the design of the 1.0 MeV RFQ which was successfully flown on the BEAR Project. C1 GAR ELECTROFORMING,DANBURY,CT 06810. RP SCHRAGE, DL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 372 EP 377 DI 10.1016/0168-583X(93)95366-D PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400100 ER PT J AU SEXTON, FW HORN, KM DOYLE, BL LAIRD, JS CHOLEWA, M SAINT, A LEGGE, GJF AF SEXTON, FW HORN, KM DOYLE, BL LAIRD, JS CHOLEWA, M SAINT, A LEGGE, GJF TI ION-BEAM-INDUCED CHARGE-COLLECTION IMAGING OF CMOS ICS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID TRANSPORT AB Charge collection regions of the Sandia TA670 16-Kbit SRAM have been directly imaged using a technique we call ion-beam-induced charge-collection (IBICC) imaging. During the IBICC measurement, the integrated circuit is connected through its power (V(DD)) or ground (V(SS)) pins to a charge sensitive preamp whose output is pulse-height analyzed while the IC is exposed to a scanned 0.1-mum resolution microbeam of heavy ions. The IC, in effect, functions as its own detector of the magnitude of charge collected following a heavy-ion strike. In this work, we examine the effect on IBICC imaging of varying power supply bias over a range of 0 to 15 V. Comparison of the IBICC image with the design layout for this integrated circuit unambiguously identifies source and drain regions of n-channel transistors and drain regions of p-channel transistors in the memory array. We were not able to image p-channel source regions in either the V(DD) or V(ss) configuration. This result is clearly explained on the basis of the IC design. Comparison of IBICC images with previously measured single-event-upset (SEU) images of the TA670 provide a more complete understanding of the mechanisms that govern single-event upset in this SRAM. IBICC holds great promise as a diagnostic tool to quantify the underlying charge collection processes that are responsible for single event upset in complex integrated circuits. It can also be applied to device failure analysis in a manner similar to EBIC, with potentially higher resolution. C1 UNIV MELBOURNE,PARKVILLE,VIC 3052,AUSTRALIA. RP SEXTON, FW (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Laird, Jamie/A-7683-2011; Cholewa, Marian/C-9474-2011 NR 13 TC 23 Z9 23 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 JUN PY 1993 VL 79 IS 1-4 BP 436 EP 442 DI 10.1016/0168-583X(93)95382-F PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400116 ER PT J AU FOSTER, LA TESMER, JR JERVIS, TR NASTASI, M AF FOSTER, LA TESMER, JR JERVIS, TR NASTASI, M TI NON-RUTHERFORD BACKSCATTERING ANALYSIS OF NITROGEN-CONTENT IN TITANIUM SUBSTRATES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB The cross section for 167-degrees backscattering of He-4 from N-14 in the energy range from 4.5 to 9.0 MeV was measured. The targets were made by evaporating 500 angstrom of zirconium on a carbon substrate and implanting with 1.3 x 10(17) N2/cm2 at 33 keV. A large scattering resonance, approximately 80 times Rutherford and FWHM > 200 keV, was found at 8.81 MeV. Titanium samples were irradiated using pulsed excimer laser radiation at 248 nm in nitrogen gas at 1 atm. The nitrogen content was measured using the N-14 alpha scattering resonance at 8.81 MeV. For fluences greater than 500 J/cm2, concentrations of nitrogen approaching that of TiN were observed. The thickness of the nitride layer is on the order of 0.35 mum. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP FOSTER, LA (reprint author), TEXAS A&M UNIV SYST,DEPT NUCL ENGN,COLL STN,TX 77843, USA. NR 12 TC 9 Z9 9 U1 1 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 JUN PY 1993 VL 79 IS 1-4 BP 454 EP 456 DI 10.1016/0168-583X(93)95386-J PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400120 ER PT J AU KNAPP, JA BANKS, JC AF KNAPP, JA BANKS, JC TI HEAVY-ION BACKSCATTERING SPECTROMETRY FOR HIGH-SENSITIVITY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID HIBS AB Heavy ion backscattering spectrometry (HIBS) using moderate energy (a few hundred keV) heavy ions has demonstrated sensitivity for medium-to-heavy surface impurities on Si more than 1000x greater than conventional Rutherford backscattering spectrometry (RBS). Problems with pileup are eliminated by a thin, self-supporting foil in front of the surface barrier detector (SBD), ranging out ions scattered from the substrate and allowing only ions scattered from impurities heavier than the substrate to reach the detector. Limitations to a SBD approach arise from relatively poor energy resolution at low energies, leading to the inability to resolve closely spaced impurity masses (such as Fe and Cu), as well as requiring an analysis beam of 250 keV or higher. In order to bypass these limitations and explore means of increasing sensitivity and mass resolution, we have built a time-of-flight (TOF) HIBS prototype, optimized for large solid angle. RP KNAPP, JA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 11 Z9 11 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 JUN PY 1993 VL 79 IS 1-4 BP 457 EP 459 DI 10.1016/0168-583X(93)95387-K PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400121 ER PT J AU LEE, SR HART, RR AF LEE, SR HART, RR TI SCREENED RUTHERFORD BACKSCATTERING CROSS-SECTIONS FOR HEAVY-ION AND LOW-ENERGY BACKSCATTERING ANALYSIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID STOPPING POWER; LIGHT-IONS; SCATTERING AB The energy dependence of the total differential scattering cross section of 20-180 keV H+, D+ and He+ ions, as well as 100-350 keV C2+ and O2+ ions, backscattered through a laboratory angle of 161.2-degrees by monolayer-thick Au targets was measured. The ratio of the measured cross section to the Rutherford cross section ranged from 0.91 for 180 keV H+ to 0.44 for 100 keV O2+. The results were found to be in excellent agreement with exact classical calculations of the scattering cross section performed using Dirac-Fock atomic potentials. A comprehensive review of all previous measurements of the screened Rutherford backscattering cross section has been performed for comparison with the present results. C1 TEXAS A&M UNIV SYST,DEPT NUCL ENGN,COLL STN,TX 77843. RP LEE, SR (reprint author), SANDIA NATL LABS,ORG 1111,ALBUQUERQUE,NM 87185, USA. NR 14 TC 7 Z9 7 U1 2 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 JUN PY 1993 VL 79 IS 1-4 BP 463 EP 467 DI 10.1016/0168-583X(93)95389-M PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400123 ER PT J AU HUGHES, IG BEHRISCH, R MARTINELLI, AP AF HUGHES, IG BEHRISCH, R MARTINELLI, AP TI DEPTH PROFILING OF DEUTERIUM USING NUCLEAR-REACTION ANALYSIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID ION-BEAMS; BERYLLIUM AB We report on a method to measure the depth profile of deuterium up to a depth of 7 mum in a carbon/beryllium layer using the D(He-3, p)He-4 nuclear reaction in a resonance-like technique. The deuterium depth profile is determined from a measurement of the proton yield as a function of incident He-3 ion energy for a limiter tile from the Joint European Torus (JET) tokamak. C1 MAX PLANCK INST PLASMA PHYS,EURATOM ASSOC,W-8046 GARCHING,GERMANY. RP HUGHES, IG (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 10 TC 3 Z9 3 U1 3 U2 5 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 JUN PY 1993 VL 79 IS 1-4 BP 487 EP 489 DI 10.1016/0168-583X(93)95395-L PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400129 ER PT J AU VOURVOPOULOS, G SCHULTZ, FJ AF VOURVOPOULOS, G SCHULTZ, FJ TI A PULSED FAST-THERMAL NEUTRON SYSTEM FOR THE DETECTION OF HIDDEN EXPLOSIVES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB It has been shown that for all known explosives a strong correlation exists between their 0 and N concentrations. C is the third element that is also common to all explosives. A system, therefore, that would be able to identify and quantify all three elements, would provide more reliable information about the interrogated material. A pulsed fast-thermal neutron system is used for the simultaneous identification of C, N, and O. Data from explosive simulants indicate the feasibility of the method. The response of various types of gamma-ray detectors to the large neutron flux is discussed. C1 OAK RIDGE NATL LAB,DIV WASTE MANAGEMENT & REMEDIAL ACT,OAK RIDGE,TN 37831. RP VOURVOPOULOS, G (reprint author), WESTERN KENTUCKY UNIV,DEPT PHYS & ASTRON,BOWLING GREEN,KY 42101, USA. NR 5 TC 16 Z9 16 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 JUN PY 1993 VL 79 IS 1-4 BP 585 EP 588 DI 10.1016/0168-583X(93)95419-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400153 ER PT J AU ARTIGALAS, H BARTHE, MF GOMEZ, J DEBRUN, JL KILIUS, L ZHAO, XL LITHERLAND, AE PINAULT, JL FOUILLAC, C CARAVATTI, P KRUPPA, G MAGGIORE, C AF ARTIGALAS, H BARTHE, MF GOMEZ, J DEBRUN, JL KILIUS, L ZHAO, XL LITHERLAND, AE PINAULT, JL FOUILLAC, C CARAVATTI, P KRUPPA, G MAGGIORE, C TI FT-ICR WITH LASER-ABLATION AND AMS COMBINED WITH X-RAY-DETECTION, APPLIED TO THE MEASUREMENT OF LONG-LIVED RADIONUCLIDES FROM FISSION OR ACTIVATION - PRELIMINARY-RESULTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB The measurement of long-lived radionuclides from fission or activation is difficult when isobars are present. Preliminary results are reported here on two methods that can solve the problem in some instances. The first one, FT-ICR with laser ablation, has a very high mass resolution; the second one, AMS combined with X-ray detection, discriminates isobars using characteristic projectile X-rays (''inverse PIXE''). C1 UNIV TORONTO,ISOTRACE LAB,TORONTO M5S 1A1,ONTARIO,CANADA. BUR RECH GEOL & MINIERES,DEPT GEOCHIM,F-45060 ORLEANS,FRANCE. SPECTROSPIN AG,CH8117 FALLANDEN,SWITZERLAND. BRUKER INSTRUMENT,BILLERICA,MA 01821. LOS ALAMOS NATL LAB,IBML,CMS,LOS ALAMOS,NM 87545. RP ARTIGALAS, H (reprint author), CERI,CNRS 3A,RUE FEROLLERIE,F-45071 ORLEANS 2,FRANCE. RI Barthe, Marie-France/C-6751-2008 NR 8 TC 16 Z9 18 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 JUN PY 1993 VL 79 IS 1-4 BP 617 EP 619 DI 10.1016/0168-583X(93)95426-6 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400160 ER PT J AU BERTSCHE, KJ AF BERTSCHE, KJ TI LINE-OF-SIGHT INJECTION INTO A TANDEM ACCELERATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A beamline has been designed to accommodate an (AMS ion source at the 0-degrees position, injecting in a straight line into the Livermore CAMS tandem accelerator [M.L. Roberts, J.R. Southon, J.C. Davis, I.D. Proctor and D.E. Nelson, Nucl. Instr. and Meth. B56/57 (1991) 882]. An AMS source at this position will allow simultaneous injection of isotopes, providing a testbed for injection techniques which may be used in a low cost RFQ accelerator for tritium AMS measurements. The use of a Wien filter in the beamline will also allow selection of individual isotopes, with the capability of rapid sequential injection of isotopes. The stable isotope current may be collected in a Faraday cup while the radioisotope is injected into the tandem, allowing continuous monitoring of ion source output for calibration purposes. This Wien filter and injection beamline should be adequate for biomedical measurements of C-14 as well as for tritium. RP BERTSCHE, KJ (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94551, USA. NR 2 TC 1 Z9 1 U1 1 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 JUN PY 1993 VL 79 IS 1-4 BP 635 EP 637 DI 10.1016/0168-583X(93)95431-4 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400165 ER PT J AU PENNYCOOK, SJ FEENSTRA, R CHISHOLM, MF NORTON, DP AF PENNYCOOK, SJ FEENSTRA, R CHISHOLM, MF NORTON, DP TI AMORPHIZATION AND RECRYSTALLIZATION OF YBA2CU3O7-X BY ION-IMPLANTATION AND ANNEALING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID CRITICAL CURRENTS; SUPERCONDUCTOR; TEMPERATURES; CRYSTALS; RECOVERY AB Transmission electron microscopy (TEM), Rutherford backscattering spectroscopy (RBS), and resistivity measurements are reported for implanted and annealed YBa2Cu3O7-x films and YBa2Cu3O7-x/PrBa2Cu3O7-x bilayers, demonstrating the complete recovery of superconductivity by low oxygen pressure annealing. The strong anisotropy in recrystallization between the a(perpendicular-to) and c(perpendicular-to) orientations and the effects of high supersaturation are discussed, as well as the implications for device applications. RP PENNYCOOK, SJ (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 22 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 641 EP 644 DI 10.1016/0168-583X(93)95432-5 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400166 ER PT J AU LOPEZURRUTIA, JRC FILL, EE BRUCH, R SCHNEIDER, D AF LOPEZURRUTIA, JRC FILL, EE BRUCH, R SCHNEIDER, D TI LASER-PLASMA ION SOURCES - APPLICATION TO CHARGE-TRANSFER X-RAY LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB Preliminary experiments directed towards the application of laser-produced plasmas in a charge-transfer X-ray laser are described. The motivation for these is the potential of the charge-transfer process to become a highly efficient pump process due to its large cross-section and state selective nature. The experiments show bright emission of ionic lines in the soft X-ray region when a beam of ions from a laser-plasma hits a secondary target a few millimeters away. C1 UNIV NEVADA,RENO,NV 89557. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LOPEZURRUTIA, JRC (reprint author), MAX PLANCK INST QUANTUM OPT,W-8046 GARCHING,GERMANY. RI Crespo Lopez-Urrutia, Jose R./F-7069-2011 OI Crespo Lopez-Urrutia, Jose R./0000-0002-2937-8037 NR 7 TC 5 Z9 5 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 JUN PY 1993 VL 79 IS 1-4 BP 705 EP 707 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400181 ER PT J AU BENZVI, I JAIN, A NOE, JW PAUL, P WANG, H LOMBARDI, A AF BENZVI, I JAIN, A NOE, JW PAUL, P WANG, H LOMBARDI, A TI DESIGN AND TEST OF A SUPERCONDUCTING RFQ FOR HEAVY-IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A prototype SRFQ resonator optimized for a velocity of beta = 0.03 and a charge to mass ratio (q/M) of 1/6 has been designed, fabricated and tested. This is a short RFQ structure (only 2betalambda long) operating at 57.4 MHz. The resonator is made of copper, and a 1.5 mum thick layer of electroplated Pb-2 at.% Sn is used as the superconductor. The electrical characteristics of the resonator derived from detailed 3D numerical simulations using the MAFIA codes, and also from measurements on the actual resonator are described. The multipactoring levels could be processed away with ease. Quality factor (Q) > 1 x 10(8) is obtained for E(a) UP to 1 MV/m. Other parameters relevant to superconducting operation are also presented. C1 BROOKHAVEN NATL LAB,DEPT NSLS,UPTON,NY 11973. INFN,LNL,I-35020 LEGNANO,ITALY. RP BENZVI, I (reprint author), SUNY,DEPT PHYS,STONY BROOK,NY 11794, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 711 EP 713 DI 10.1016/0168-583X(93)95449-F PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400183 ER PT J AU WANGLER, TP CIMABUE, AG MERSON, J MILLS, RS WOOD, RL YOUNG, LM AF WANGLER, TP CIMABUE, AG MERSON, J MILLS, RS WOOD, RL YOUNG, LM TI SUPERCONDUCTING RFQ LINEAR-ACCELERATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB We are investigating the performance capabilities of a niobium superconducting radiofrequency quadrupole (RFQ) accelerator for high-field continuous-wave operation, to provide greater acceleration and stronger focusing of low-velocity ion beams. We present an example of an RFQ to produce radioisotopes for positron-emission tomography (PET), and we report on the mechanical design aspects of a short, superconducting RFQ four-vane prototype structure that will be tested at high fields during the coming year. RP WANGLER, TP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 718 EP 720 DI 10.1016/0168-583X(93)95451-A PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400185 ER PT J AU SCHRAGE, DL YOUNG, LM AIKIN, DJ CLARK, WL DEPAULA, RF GLADWELL, C MARTINEZ, FA NARANJO, AC ROYBAL, PL STOVALL, JE AF SCHRAGE, DL YOUNG, LM AIKIN, DJ CLARK, WL DEPAULA, RF GLADWELL, C MARTINEZ, FA NARANJO, AC ROYBAL, PL STOVALL, JE TI UNIVERSITY-OF-TWENTE PHOTOCATHODE LINAC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A 6 MeV, 1300 MHz photocathode linear accelerator (linac) has been designed and fabricated by Los Alamos National Laboratory for The Netherlands Center for Laser Research at the University of Twente in Enschede, The Netherlands. The six-cell photoinjector linac is a brazed copper on-axis coupled structure inside a vacuum jacket with an integral vacuum bakeout system. It is a near duplicate of an accelerator which has been in service at the Los Alamos High Brightness Accelerator Facility since 1989. RP SCHRAGE, DL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 721 EP 725 DI 10.1016/0168-583X(93)95452-B PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400186 ER PT J AU LISKA, D SMITH, P CARLISLE, L LARKIN, T AF LISKA, D SMITH, P CARLISLE, L LARKIN, T TI BRIDGE COUPLED DRIFT-TUBE LINACS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB Modern linac designs for treating radioactive waste achieve high proton currents through funneling at low energy, typically around 20 MeV. The resulting switch to a high-frequency accelerating structure poses severe performance and fabrication difficulties below 100 MeV. Above 100 MeV, proven coupled-cavity linacs (CCLs) are available. However, at 20 MeV one must choose between a high-frequency drift-tube linac (DTL) or a coupled-cavity linac with very short cells. Potential radiation damage from the CW beam, excessive RF power losses, multipactoring, and fabricability all enter into this decision. At Los Alamos, we have developed designs for a bridge-coupled DTL (BCDTL) that, like a CCL, uses lattice focusing elements and bridge couplers, but that unlike a CCL, accelerates the beam in simple, short, large aperture DTL modules with no internal quadrupole focusing. Thus, the BCDTL consumes less power than the CCL linac without degrading beam performance and is simpler and cheaper to fabricate in the 20 to 100 MeV range. RP LISKA, D (reprint author), LOS ALAMOS NATL LAB,DIV ACCELERATOR TECHNOL,POB 1663,MS H821,LOS ALAMOS,NM 87545, USA. NR 1 TC 0 Z9 0 U1 1 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 JUN PY 1993 VL 79 IS 1-4 BP 729 EP 731 DI 10.1016/0168-583X(93)95454-D PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400188 ER PT J AU BOLLINGER, LM PARDO, RC SHEPARD, KW BILLQUIST, PJ BOGATY, JM CLIFFT, BE HARKEWICZ, R MUNSON, FH NOLEN, JA ZINKANN, GP AF BOLLINGER, LM PARDO, RC SHEPARD, KW BILLQUIST, PJ BOGATY, JM CLIFFT, BE HARKEWICZ, R MUNSON, FH NOLEN, JA ZINKANN, GP TI THE POSITIVE-ION INJECTOR OF ATLAS - DESIGN AND OPERATING EXPERIENCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB The recently completed positive-ion injector for the heavy-ion accelerator ATLAS is a replacement for the tandem injector of the present tandem-linac system. Unlike the tandem, the new injector provides ions from the full range of the periodic table. The concept for the new injector, which consists of an ECR ion source on a voltage platform coupled to a very-low-velocity superconducting linac, introduces technical problems and uncertainties that are well beyond those encountered previously for superconducting linacs. The solution to these problems and their relationship to performance are outlined, and experience in the operation of ATLAS with its new injector is discussed. RP BOLLINGER, LM (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 12 TC 17 Z9 17 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 JUN PY 1993 VL 79 IS 1-4 BP 753 EP 757 DI 10.1016/0168-583X(93)95460-M PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400194 ER PT J AU FAEHL, RJ REJ, DJ AF FAEHL, RJ REJ, DJ TI MAGNETICALLY INSULATED ION DIODES FOR SYNTHESIS OF ADVANCED MATERIALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID BEAM IRRADIATION; SURFACE AB Magnetically insulated ion diode technology has been used to generate intense ion beams. We have used such beams to form ablation plasmas from solid targets. Initial experiments have studied congruent deposition of complex stoichiometric thin films. Typical ion diode parameters are 400 kV and 35 kA ion beams over a pulse length of approximately 0.5 mus. Diode operation has been modeled with 2.5-D particle-in-cell simulations. These calculations allow us to unfold the dynamics of electron flow, ion flow, and their interactions to recover time-dependent impedance behavior which is in good agreement with data. Transport of the dense ion flow through an extraction section of the diode requires a high degree of charge neutralization. Self-consistent neutralization dynamics have been modeled with the simulations. We present the latest numerical results and compare them with data from the ongoing experiments. RP FAEHL, RJ (reprint author), LOS ALAMOS NATL LAB,MS B259,LOS ALAMOS,NM 87545, USA. NR 10 TC 0 Z9 0 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 JUN PY 1993 VL 79 IS 1-4 BP 776 EP 778 DI 10.1016/0168-583X(93)95466-I PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400200 ER PT J AU WOOD, RL YOUNG, LM AIKIN, DJ CLARK, WL DEPAULA, RF GLADWELL, C LEDFORD, JE MARTINEZ, FA STOVALL, JE AF WOOD, RL YOUNG, LM AIKIN, DJ CLARK, WL DEPAULA, RF GLADWELL, C LEDFORD, JE MARTINEZ, FA STOVALL, JE TI PHOTOCATHODE ELECTRON LINAC FOR AFEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A compact, high brightness accelerator was designed and fabricated by Los Alamos National Laboratory for use in the Advanced Free Electron Laser (AFEL) Facility. A brazed copper, 1300-MHz, 20-MeV structure is suspended within a thermally insulating vacuum vessel. Integral cooling passages allow introduction of cooling water for normal operation, or liquid nitrogen for cryogenic operation. Its exceptional beam quality is expected to enhance the performance of the FEL experiments planned for the AFEL Facility. RP WOOD, RL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 2 TC 2 Z9 2 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 JUN PY 1993 VL 79 IS 1-4 BP 800 EP 805 DI 10.1016/0168-583X(93)95473-I PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400207 ER PT J AU GALL, KP VERHEY, L ALONSO, J CASTRO, J COLLIER, JM CHU, W DAFTARI, I GOITEIN, M KUBO, H LUDEWIGT, B MUNZENRIDER, J PETTI, P RENNER, T ROSENTHAL, S SMITH, A STAPLES, J SUIT, H THORNTON, A AF GALL, KP VERHEY, L ALONSO, J CASTRO, J COLLIER, JM CHU, W DAFTARI, I GOITEIN, M KUBO, H LUDEWIGT, B MUNZENRIDER, J PETTI, P RENNER, T ROSENTHAL, S SMITH, A STAPLES, J SUIT, H THORNTON, A TI STATE-OF-THE-ART - NEW PROTON MEDICAL FACILITIES FOR THE MASSACHUSETTS-GENERAL-HOSPITAL AND THE UNIVERSITY-OF-CALIFORNIA-DAVIS MEDICAL-CENTER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF DAVIS,SACRAMENTO MED CTR,MED CTR,DEPT RADIAT ONCOL,SACRAMENTO,CA 95817. UNIV CALIF SAN FRANCISCO,DEPT RADIAT ONCOL,SAN FRANCISCO,CA 94143. RP GALL, KP (reprint author), MASSACHUSETTS GEN HOSP,DEPT RADIAT ONCOL,BOSTON,MA 02114, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 881 EP 884 DI 10.1016/0168-583X(93)95490-V PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400224 ER PT J AU HORN, KM DOYLE, BL AF HORN, KM DOYLE, BL TI MICRO-RADIOSURGERY - A NEW CONCEPT FOR RADIOTHERAPY BASED UPON LOW-ENERGY, ION-INDUCED NUCLEAR-REACTIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID CROSS-SECTION AB Traditionally, proton radiotherapy has required the use of high energy proton beams (50-200 MeV) which can penetrate into a patient's body to the site of a tumor that is to be destroyed through irradiation. However, substantial damage is still done to healthy tissue along the path of the incident proton beam, as much as 30% of that done at the tumor site. We propose a new concept for the production and delivery of energetic protons for use in medical radiotherapy, based upon the fact that low energy, ion-induced nuclear reactions can produce radiation products suitable for use in radiotherapy applications. By employing specially fabricated ''conduit needles'' to deliver beams of energetic ions to selected target materials plugging the end of the needle, ion beam-induced nuclear reactions can be generated at the needle tip, emitting reaction-specific radiation products directly at the tumor site. In this paper, we show that the 13.6 MeV protons produced by the d(He-3,p)He-4 nuclear reaction can deliver a lethal dose (7 krad) of radiation to a 4.4 mm diameter sphere of tissue in only 30 s using a 1 muA, 800 keV He-3 ion beam. If also proven clinically feasible, the use of low energy, ion-induced nuclear reactions would allow the utilization of relatively inexpensive, compact, low energy ion accelerators for proton radiotherapy and minimize unintended radiation damage to healthy tissue by providing much greater precision in controlling the irradiated volume. RP HORN, KM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 1 Z9 1 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 JUN PY 1993 VL 79 IS 1-4 BP 901 EP 906 DI 10.1016/0168-583X(93)95495-Q PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400229 ER PT J AU FIROUZBAKHT, ML SCHLYER, DJ FINN, RD LAGUZZI, G WOLF, AP AF FIROUZBAKHT, ML SCHLYER, DJ FINN, RD LAGUZZI, G WOLF, AP TI I-124 PRODUCTION - EXCITATION-FUNCTION FOR THE TE-124(D, 2N)I-124 AND TE-124(D, 3N) I-123 REACTIONS FROM 7 TO 24-MEV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID POSITRON EMISSION TOMOGRAPHY; RADIOIMMUNOTHERAPY AB The excitation function for the production of I-124 and I-123 from deuterons on Te-124 has been measured over the energy interval of 7.5 to 23.6 MeV. The target used was a compressed tellurium powder target. The thick target yields for both radioisotopes have been calculated, radiochemical purity was determined and recovery of the isotopically enriched tellurium has been investigated. C1 MEM SLOAN KETTERING CANC CTR,NEW YORK,NY 10021. IST CHIM NUCL,ROME,ITALY. RP FIROUZBAKHT, ML (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 12 TC 23 Z9 23 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 JUN PY 1993 VL 79 IS 1-4 BP 909 EP 910 DI 10.1016/0168-583X(93)95496-R PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400230 ER PT J AU KULKARNI, PV ANDERSON, JA ANTICH, PP PRIOR, JO ZHANG, Y FERNANDO, J CONSTANTINESCU, A GOOMER, NC PARKEY, RW FENYVES, E CHANEY, RC SRIVASTAVA, SC MAUSNER, LF AF KULKARNI, PV ANDERSON, JA ANTICH, PP PRIOR, JO ZHANG, Y FERNANDO, J CONSTANTINESCU, A GOOMER, NC PARKEY, RW FENYVES, E CHANEY, RC SRIVASTAVA, SC MAUSNER, LF TI NEW APPROACHES IN MEDICAL IMAGING USING PLASTIC SCINTILLATING DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB A small animal imaging camera was built in our laboratory, using fast plastic scintillating detectors (tau = 2-4 ns) and position sensitive photomultipliers (Hamamatsu) digitized using flash ADCs. Pinhole collimators were used for I-125 imaging to achieve submillimeter resolution with scintillating plates of 28 mm radius and 1.5 mm thickness. A high resolution PET module was constructed with arrays of 1.0 mm diameter plastic scintillating fibers. The feasibility of high resolution imaging was demonstrated by the study of brain blood flow in a rat using I-125 IMP in single photon detection mode and with Cu-64 PTSM by using PET mode. Construction of single photon and positron emission tomographic imaging systems for small animals and subsequently for human imaging is in progress. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KULKARNI, PV (reprint author), UNIV TEXAS,SW MED CTR,DALLAS,TX 75230, USA. OI Prior, John/0000-0003-1429-1374 NR 4 TC 12 Z9 12 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 JUN PY 1993 VL 79 IS 1-4 BP 921 EP 925 DI 10.1016/0168-583X(93)95500-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400234 ER PT J AU DOYLE, BL AF DOYLE, BL TI SHAFROTH,STEPHEN,M SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Item About an Individual RP DOYLE, BL (reprint author), SANDIA NATL LABS,DEPT ION SOLID INTERACT & DEFECT PHYS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP R11 EP R12 DI 10.1016/0168-583X(93)95264-6 PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400003 ER PT J AU BACK, BB AF BACK, BB TI RADIATION SAFETY AT LOW-ENERGY HEAVY-ION ACCELERATORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID FUSION; NUCLEI; BARRIER AB The beam induced radiation hazards at low energy heavy ion accelerators are evaluated on the basis of nuclear physics principles. The flux, energy and angular distribution of neutrons and gamma-rays generated by stopping the beam in various materials are calculated and compared to available experimental data. Beam interactions with the residual gas in beam pipes are not considered. The induced radioactivity of beam stopping components is estimated. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 18 TC 2 Z9 2 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 JUN PY 1993 VL 74 IS 4 BP 527 EP 541 DI 10.1016/0168-583X(93)95952-2 PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LG426 UT WOS:A1993LG42600009 ER PT J AU REFFO, G MACGREGOR, MH AF REFFO, G MACGREGOR, MH TI CALCULATION OF NEUTRON SUPERINELASTIC SCATTERING IN HF-178M SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Theoretical calculations of neutron superinelastic scattering on the 2.45-MeV 16+ meta-stable state in Hf-178 are performed. The results of the cross-section calculations from the point of view of possible applications that involve energy gains obtained by using various neutron sources are analyzed. C1 ENEA,INN SVIL CAL,I-40138 BOLOGNA,ITALY. RP REFFO, G (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 10 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 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1993 VL 114 IS 2 BP 124 EP 134 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LD873 UT WOS:A1993LD87300005 ER PT J AU DICKENS, JK MILLER, MA AF DICKENS, JK MILLER, MA TI MEASUREMENTS AND CALCULATIONS OF RADIONUCLIDES CREATED BY TA-181 (GAMMA, XN YP) REACTIONS FOR BREMSSTRAHLUNG PHOTONS PRODUCED BY 150-MEV ELECTRONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note ID NUCLEI; DECAY; PB AB Twenty-three radionuclides, including isomers, from 168mLu to Ta-180, having half-lives between 7 min and 1.4 yr, produced by photon interactions with a sample of elemental tantalum, were observed in decay gamma-ray data obtained using high-resolution detection systems. Yields of production range over six orders of magnitude. The measured yield data for masses greater-than-or-equal-to 171 were compared with calculated values. Good agreement was obtained for masses greater-than-or-equal-to 174, but for lighter masses, the calculations tend to overestimate the experimental yields by up to a factor of 5. An empirical ''rule-of-two'' is proposed, governing reduction in measured mass yield for each additional emitted nucleon following (gamma,3n) reactions. These results should have practical use not only for present electron accelerator operation but also for shielding calculations needed for future accelerator designs and applications. RP DICKENS, JK (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 49 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1993 VL 114 IS 2 BP 149 EP 159 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LD873 UT WOS:A1993LD87300008 ER PT J AU SOARES, I MILLER, WF PERRY, RT AF SOARES, I MILLER, WF PERRY, RT TI ANALYSIS OF ONEDANT CODE PACKAGE FOR THE CALCULATION OF THE DOPPLER COEFFICIENT OF REACTIVITY SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note AB The viability of the use of the ONEDANT discrete ordinates code for the calculation of the Doppler coefficient of reactivity for a pressurized water reactor is investigated. The ONEDANT results are compared with benchmark results from a Monte Carlo code, MCNP-3A. A comparison with the results obtained using the CELL-2 and WIMS-AECL codes is also included. The influences of certain variables, such as spatial mesh, S(N) angular quadrature order, interaction convergence criterion, boundary conditions, P(N) order, and number of energy groups, are analyzed. An alternative benchmark calculation to the Monte Carlo result is attempted to provide some feel for the approximate accuracy of the Monte Carlo calculation. Such an alternative answer is important when less approximate methods are compared with these results. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SOARES, I (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, 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 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1993 VL 114 IS 2 BP 160 EP 167 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LD873 UT WOS:A1993LD87300009 ER PT J AU ADAMS, JP PETERSON, ES AF ADAMS, JP PETERSON, ES TI STEAM-GENERATOR SECONDARY PH DURING A STEAM-GENERATOR TUBE RUPTURE SO NUCLEAR TECHNOLOGY LA English DT Article DE SGTR; PH; DESIGN-BASIS ACCIDENT AB The iodine concentration in the steam generator secondary vapor must be determined in order to estimate the environmental consequences (i. e., iodine source term to the environment) due to a steam generator tube rupture (SG TR). Experimental evidence indicates that this concentration is sensitive to the liquid-phase pH. A thermodynamic-based calculational approach was used to model the pH during a design-basis SG TR. The EQUILIBRIUM code with in the Facility for Analysis of Chemical Thermodynamics was assessed for calculation of pH by comparison with measured pH's in operating pressurized water reactors (PWRs). The pH was calculated for ten generic PWR designs (one Babcock & Wilcox, three Combustion Engineering, and six Westinghouse). The calculated pH was shown to be relatively insensitive to PWR design. The pH for all designs equilibrated to a value of approximately 6.5. RP ADAMS, JP (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,DEPT ENGN RES & APPLICAT,POB 1625-1576,IDAHO FALLS,ID 83415, USA. NR 17 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 JUN PY 1993 VL 102 IS 3 BP 304 EP 312 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LC351 UT WOS:A1993LC35100003 ER PT J AU GOFF, KM SCHNEIDER, A BATTLES, JE AF GOFF, KM SCHNEIDER, A BATTLES, JE TI CADMIUM TRANSPORT THROUGH MOLTEN-SALTS IN THE REPROCESSING OF SPENT FUEL FOR THE INTEGRAL FAST-REACTOR SO NUCLEAR TECHNOLOGY LA English DT Article DE CADMIUM; SALT; INTEGRAL FAST REACTOR AB The reprocessing of spent fuel from the Integral Fast Reactor is to be accomplished with a pyrochemical process employing molten LiCl-KCl salt covering a pool of cadmium. An examination of this system demonstrates that cadmium metal is soluble to a small extent in this salt and that it diffuses through the salt covering and vaporizes at the surface. The cadmium is soluble in the salt because of either chemical or physical solubility, both of which are dependent on the salt's surface tension. Mixing increases the vaporization rate of the cadmium by increasing its transport to the salt surface. The cadmium vapors can therefore be reduced by decreasing the mixing conditions, by choosing a salt with a higher surface tension so that the cadmium is less soluble, or by decreasing the temperature of the system, thereby lowering the vapor pressure of the cadmium. C1 GEORGIA INST TECHNOL,SCH NUCL ENGN,ATLANTA,GA 30332. ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. NR 11 TC 6 Z9 6 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1993 VL 102 IS 3 BP 331 EP 340 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LC351 UT WOS:A1993LC35100006 ER PT J AU BRIDGES, AE WALTAR, AE LEGGETT, RD BAKER, RB ETHRIDGE, JL AF BRIDGES, AE WALTAR, AE LEGGETT, RD BAKER, RB ETHRIDGE, JL TI A LIQUID-METAL REACTOR CORE DEMONSTRATION EXPERIMENT USING HT-9 SO NUCLEAR TECHNOLOGY LA English DT Article DE HT-9; FAST REACTOR; LIQUID-METAL REACTOR AB The use of the ferritic/martensitic HT-9 alloy as the cladding and duct material for the Core Demonstration Experiment (CDE) directly contributed to the attainment of the high fuel burnup levels critical to the viability of an economical liquid-metal reactor fuel system. The CDE, a partial core loading of fuel and blanket assemblies in the U. S. Department of Energy's Fast Flux Test Facility, has successfully attained its irradiation exposure goal of 3 yr. Consisting of ten fuel and six blanket assemblies in a heterogeneous core configuration, the CDE has clearly demonstrated the capability of the advanced fuel and blanket designs to attain high burnups and fast fluences. Each CDE fuel assembly consisted of 169 large-diameter fuel pins comprising mixed-oxide annular fuel pellets in sealed HT-9 cladding tubes. Each CDE blanket assembly consisted of 91 large-diameter pins comprising solid depleted uranium dioxide pellets in sealed HT-9 cladding tubes. The maximum-exposure CDE fuel assembly reached a peak pellet burnup of 163 900 MWd/tonne metal (M) and a peak fast fluence (E > 0.1 MeV) of 23.3 x 10(22) n/cm2. The maximum-exposure CDE blanket assembly reached a peak pellet burnup of 43 100 MWd/tonne M and a peak fast fluence (E > 0.1 MeV) of 22.8 x 10(22) n/cm2. Lead test fuel assemblies built to CDE specifications continue their successful irradiation and have attained burnups of > 238 000 MWd/tonne M with accumulated fast fluences (E > 0.1 Me V) of >38 x 10(22) n/cm2. In-core measurements of HT-9 ducts and withdrawal loads of the assemblies indicate that duct distortion will not be a factor that limits the lifetime of the fuel or blanket assemblies. Comparison of the measured and predicted coolant outlet temperatures from the peak CDE fuel and blanket assemblies indicate the irradiation of the CDE has proceeded as planned. The CDE represents a tremendous success in demonstrating the lifetime capabilities of this advanced oxide system using the HT-9 ferritic alloy for structural materials. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP BRIDGES, AE (reprint author), WESTINGHOUSE HANFORD CO, TECHNOL APPLICAT, POB 1970, RICHLAND, WA 99352 USA. NR 15 TC 10 Z9 10 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1993 VL 102 IS 3 BP 353 EP 366 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LC351 UT WOS:A1993LC35100008 ER PT J AU KLUEH, RL AF KLUEH, RL TI TENSILE BEHAVIOR OF NEUTRON-IRRADIATED MARTENSITIC STEELS - A REVIEW SO NUCLEAR TECHNOLOGY LA English DT Article DE MARTENSITIC STEELS; RADIATION EFFECTS; TENSILE PROPERTIES ID 9 CR-1 MOVNB; FERRITIC STEELS; 550-DEGREES-C; 9CR-1MOVNB AB Chromium-molybdenum martensitic (ferritic) steels such as 9 Cr-1 Mo-V-Nb and 12 Cr-1 Mo-V-W are candidates for fast reactor and fusion reactor applications. In a fast reactor, the effect of neutron irradiation is caused by displacement damage, that is, by the interstitials and vacancies that are created by the high-energy neutrons. Increases in strength occur for irradiation up to approximately 450-degrees-C. This hardening is largely attributed to the dislocation loops that form from the agglomeration of the interstitials. Precipitates that form during irradiation can also contribute to the hardening. At higher temperatures, most of the displacement damage anneals out. Irradiation effects expected in the first wall of a fusion reactor differ from those in a fast reactor. In addition to displacement damage, large amounts of transmutation helium will also be produced. The simultaneous effects of displacement damage and helium can be simulated by irradiating nickel-doped ferritic steels in a mixed-spectrum fission reactor. Helium is produced by transmutation reactions between thermal neutrons and nickel, and displacement damage is formed by the fast neutrons of the spectrum. Results using this technique indicate that hardening occurs as in a fast reactor, but the helium causes a strength increase in addition to that caused by displacement damage alone. This effect of helium could have a significant effect on other properties, especially toughness, and must be considered in the design of fusion reactors. RP KLUEH, RL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 26 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 JUN PY 1993 VL 102 IS 3 BP 376 EP 385 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LC351 UT WOS:A1993LC35100010 ER PT J AU VO, TV SIMONEN, FA DOCTOR, SR SMITH, BW GORE, BF AF VO, TV SIMONEN, FA DOCTOR, SR SMITH, BW GORE, BF TI DEVELOPMENT OF IN-SERVICE INSPECTION PLANS FOR NUCLEAR-COMPONENTS AT THE SURRY UNIT-1 NUCLEAR-POWER STATION SO NUCLEAR TECHNOLOGY LA English DT Article DE INSPECTION; JUDGMENT; RISK AB As part of the nondestructive evaluation reliability program sponsored by the U.S. Nuclear Regulatory Commission at Pacific North west Laboratory, a methodology has been developed for establishing in-service inspection priorities of nuclear power plant components. The method uses results of probabilistic risk assessment in conjunction with the techniques of failure modes and effects analysis to identify and prioritize the most risk-important systems and components for inspection at nuclear power plants. Surry nuclear power station unit 1 was selected for demonstrating the methodology. The specific systems selected for analysis were the reactor pressure vessel, the reactor coolant, the low pressure injection including the accumulators, and the auxiliary feedwater. The results provide a risk-based ranking of components that can be used to establish a prioritization of the components and a basis for developing improved in-service inspection plans at nuclear power plants. RP VO, TV (reprint author), PACIFIC NW LAB, OPERAT SAFETY & REGULATORY ANAL SECT, POB 999, RICHLAND, WA 99352 USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1993 VL 102 IS 3 BP 403 EP 415 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LC351 UT WOS:A1993LC35100012 ER PT J AU RIEMKE, RA AF RIEMKE, RA TI MODIFICATION TO UNALS SUBCOOLED FLOW BOILING BUBBLE MODEL SO NUCLEAR TECHNOLOGY LA English DT Note DE CONDENSATION; SUBCOOLED BOILING; RELAP5 AB Unal's subcooled flow boiling bubble model is being used in the best-estimate light water reactor code RELAP5/MOD3. There is a significant discontinuity (by a factor of 2) in the condensation heat transfer coefficient from this model at 1 MPa, which can cause numerical problems in the code. The correlation has been modified (with the approval of Unal) to remove the discontinuity at 1 MPa and to replace it with a form that is continuous to three significant places at 1.1272 MPa. RP RIEMKE, RA (reprint author), EG&G IDAHO INC,IDAHO ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 6 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 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1993 VL 102 IS 3 BP 416 EP 417 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LC351 UT WOS:A1993LC35100013 ER PT J AU FISCELLA, M ULLRICH, SJ ZAMBRANO, N SHIELDS, MT LIN, D LEESMILLER, SP ANDERSON, CW MERCER, WE APPELLA, E AF FISCELLA, M ULLRICH, SJ ZAMBRANO, N SHIELDS, MT LIN, D LEESMILLER, SP ANDERSON, CW MERCER, WE APPELLA, E TI MUTATION OF THE SERINE 15 PHOSPHORYLATION SITE OF HUMAN P53 REDUCES THE ABILITY OF P53 TO INHIBIT CELL-CYCLE PROGRESSION SO ONCOGENE LA English DT Article ID CASEIN KINASE-II; WILD-TYPE; TRANSCRIPTIONAL ACTIVATION; PROTEIN-KINASE; GROWTH; GENE; SUPPRESSOR; INVITRO; P53-PROTEIN; EXPRESSION AB Overexpression of wild-type p53 prevents cells from entering the S phase of the cell cycle. The amino-terminal transactivation region of p53 is phosphorylated by several protein kinases, including DNA-PK, a nuclear serine/threonine protein kinase that in vitro requires DNA for activity. DNA-PK was recently shown to phosphorylate serines 15 and 37 of human p53 (Lees-Miller et al, 1992. Mol. Cell. Biol., 12, 5041-5049). To prevent phosphorylation at these sites, mutants were constructed that changed the codons for serine 15 or serine 37 to alanine codons. Expression of p53-Ala-37 in stably transformed T98G cells blocked progression of the cells into S phase as well as did the expression of wild-type p53. In contrast, p53-Ala-15 was partially defective in blocking cell cycle progression. Several cell clones transformed with the mutant p53-Ala-15 gene expressed normal levels of p53 mRNA but accumulated little or no detectable p53 protein. However, by using a transient expression system driven by a strong cytomegalovirus promoter, we showed that the inability of p53-Ala-15 to fully block cell cycle progression was not due to inadequate levels of expression or to a failure of the mutant protein to accumulate in the nucleus. These results suggest that phosphorylation of Ser-15 may affect p53 function. C1 NIH,CELL BIOL LAB,BETHESDA,MD 20892. THOMAS JEFFERSON UNIV,JEFFERSON CANC INST,PHILADELPHIA,PA 19107. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Zambrano, Nicola/B-9352-2014 OI Zambrano, Nicola/0000-0001-9395-3481 FU NCI NIH HHS [CA 42866]; NCRR NIH HHS [BRSG S07 RR05417] NR 59 TC 165 Z9 166 U1 0 U2 1 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD JUN PY 1993 VL 8 IS 6 BP 1519 EP 1528 PG 10 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA LE064 UT WOS:A1993LE06400015 PM 8502477 ER PT J AU KRAUS, HG AF KRAUS, HG TI CHARACTERISTIC PATHLENGTH FRESNEL NUMBER EQUATIONS AND IDEAL LENS WAVE-FRONT KIRCHHOFF FORMULATION - ANALYSIS OF FOCUSED SPHERICAL WAVE DIFFRACTION FIELDS SO OPTICS AND LASER TECHNOLOGY LA English DT Article DE FRESNEL NUMBERS; KIRCHHOFF DIFFRACTION FORMULATION; CIRCULAR APERTURES; FOCUSED FIELD SHIFT ID SYSTEMS AB Derivation and applications of the characteristic optical pathlength Fresnel number equation for spherical waves focused by an 'ideal' circular lens illustrate the wealth of information which is quickly available from its use. A Kirchhoff wavefront diffraction formulation of this problem is developed and used to aid in this analysis. New characteristics about the diffraction field are revealed. RP KRAUS, HG (reprint author), IDAHO NATL ENGN LAB,POB 1625,MS 1575,IDAHO FALLS,ID 83415, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0030-3992 J9 OPT LASER TECHNOL JI Opt. Laser Technol. PD JUN PY 1993 VL 25 IS 3 BP 193 EP 198 DI 10.1016/0030-3992(93)90066-O PG 6 WC Optics; Physics, Applied SC Optics; Physics GA LJ609 UT WOS:A1993LJ60900008 ER PT J AU STERN, JE AF STERN, JE TI WILL TERRORISTS TURN TO POISON SO ORBIS-A JOURNAL OF WORLD AFFAIRS LA English DT Article RP STERN, JE (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR SECURITY & TECHNOL STUDIES,LIVERMORE,CA 94550, USA. NR 19 TC 5 Z9 5 U1 0 U2 0 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 0030-4387 J9 ORBIS-J WORLD AFF JI Orbis-J. World Aff. PD SUM PY 1993 VL 37 IS 3 BP 393 EP 410 DI 10.1016/0030-4387(93)90153-4 PG 18 WC International Relations SC International Relations GA LL418 UT WOS:A1993LL41800006 ER PT J AU QIN, YO BAKAC, A ESPENSON, JH AF QIN, YO BAKAC, A ESPENSON, JH TI DISSOCIATION AND RECOMBINATION DYNAMICS OF THE COMPLEXES [(ETA(5)-C5R5)CR(CO)3]2 (R = H, ME) SO ORGANOMETALLICS LA English DT Note ID METAL BONDED COMPLEXES; EQUILIBRIUM; DIMER; MO AB The kinetics of the thermal dissociation and subsequent recombination reactions of [(eta5-C5R5)-Cr(CO)3]2 and (eta5-C5R5)Cr(CO)3 (R = H, Me) in solution have been investigated. The rapidly established dimer-monomer equilibrium was perturbed photochemically. The Cr-Cr bond efficiently cleaves in the laser flash to yield more of the 17-electron radicals (eta5-C5R5)Cr(CO)3, which partially dimerize. The dissociation and recombination rate constants are k1 = (1.2 +/- 0.1) x 10(5) s-1 and k-1 = (2.7 +/- 0.2) x 10(8) L mol-1 s-1 for [(eta5-C5H5)Cr(CO)3]2 and k1 = (5.6 +/- 0.5) x 10(5) s-1 and k-1 = (7.0 +/- 0.6) x 10(6) L mol-1 s-1 for [(eta5-C5Me5)Cr(CO)3]2 at 23-degrees-C in acetonitrile. Very similar values were also found in tetrahydrofuran and toluene. The strength of the metal-metal bond is reflected in both forward and reverse rate constants not only for these complexes but also for the tungsten and molybdenum analogues. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 18 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUN PY 1993 VL 12 IS 6 BP 2010 EP 2012 PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LG158 UT WOS:A1993LG15800007 ER PT J AU PARK, JH NATESAN, K AF PARK, JH NATESAN, K TI OXIDATION OF COPPER AND ELECTRONIC TRANSPORT IN COPPER OXIDES SO OXIDATION OF METALS LA English DT Article DE CU OXIDATION; ELECTRICAL CONDUCTIVITY; DEFECT MECHANISM; DEFECT MOBILITY; NONSTOICHIOMETRY; COPPER OXIDES ID HIGH-TEMPERATURE OXIDATION; INSITU OBSERVATION; DIFFUSION; SCALES; METALS; CU2O AB Oxidation of copper and electronic transport in thermally-grown large-grain polycrystals of nonstoichiometric copper oxides were studied at elevated temperatures. Thermogravimetric copper oxidation was studied in air and oxygen at temperatures between 350 and 1000-degrees-C From the temperature dependence of the oxidation rates, three different processes can be identified for the oxidation of copper: bulk diffusion, grain-boundary diffusion, and surface control with whisker growth; these occur at high, intermediate, and low temperatures, respectively. Electrical-conductivity measurements as a function of temperature (350-1134-degrees-C) and oxygen partial pressure (10(-8)-1.0 atm) indicate intrinsic electronic conduction in CuO over the entire range of conditions. Electronic behavior of nonstoichiometric Cu2O indicates that the charge defects are doubly-ionized oxygen interstitials and holes. The calculated enthalpy of formation of oxygen (DELTAH(O2)) and hole-conduction energy (E(H)) at constant composition for nonstoichiometric Cu2O are 2.0 +/- 0.2 eV and 0.82 +/- 0.02 eV, respectively. RP PARK, JH (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 39 TC 65 Z9 65 U1 4 U2 26 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0030-770X J9 OXID MET JI Oxid. Met. PD JUN PY 1993 VL 39 IS 5-6 BP 411 EP 435 DI 10.1007/BF00664664 PG 25 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LX417 UT WOS:A1993LX41700005 ER PT J AU FRISCHHERZ, MC KIRK, MA ZHANG, JP WEBER, HW AF FRISCHHERZ, MC KIRK, MA ZHANG, JP WEBER, HW TI TRANSMISSION ELECTRON-MICROSCOPY OF DEFECT CASCADES IN YBA2CU3O7-DELTA PRODUCED BY ION IRRADIATION SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID DISPLACEMENT CASCADES; COLLISION CASCADES; ATOMIC-STRUCTURE; SIMULATION; SUPERCONDUCTIVITY; DIFFRACTION; DYNAMICS AB YBa2Cu3O7-delta single crystals were irradiated with 50 and 85 keV Kr+ and Xe+ ions to low doses, producing spatially isolated defect cascades. One irradiation was performed at low temperature. The resulting defects were investigated by conventional and high-resolution transmission electron microscopy. They were found to have primarily an amorphous-like structure with an inwardly directed (vacancy) strain field. Evidence for lattice melting, with coherent or incoherent recrystallization at some defect cascade sites, is presented for the first time. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MAT SCI,EVANSTON,IL 60208. RP FRISCHHERZ, MC (reprint author), UNIV VIENNA,INST ATOM,A-1020 VIENNA,AUSTRIA. NR 37 TC 32 Z9 32 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUN PY 1993 VL 67 IS 6 BP 1347 EP 1363 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA LJ525 UT WOS:A1993LJ52500005 ER PT J AU SOPER, SA NUTTER, HL KELLER, RA DAVIS, LM SHERA, EB AF SOPER, SA NUTTER, HL KELLER, RA DAVIS, LM SHERA, EB TI THE PHOTOPHYSICAL CONSTANTS OF SEVERAL FLUORESCENT DYES PERTAINING TO ULTRASENSITIVE FLUORESCENCE SPECTROSCOPY SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; LASER-INDUCED FLUORESCENCE; SINGLE-MOLECULE DETECTION; SAMPLES AB The successful implementation of ultrasensitive fluorescence spectroscopy of biological and chemical species depends upon certain photophysical parameters associated with the fluorescent dye used in the investigation. These parameters include the fluorescence quantum efficiency, photodestruction quantum efficiency, absorption cross section and fluorescence lifetime. These photophysical constants were measured for several fluorescent dyes that are used for the tagging of biological species. Three different solvents, ethanol, water and a cationic surfactant used above its critical micelle concentration, were studied. The effective photon yield (ratio of the fluorescence quantum yield to the photodestruction quantum efficiency) for the dyes is nearly 100 times greater in ethanol than it is in water because of the superior photostabilities of these dyes in ethanol solvents. The implications of these parameters for the design of an ultrasensitive fluorescence experiment are discussed. C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,DIV CHEM LASER SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. UNIV TENNESSEE,CTR LASER APPLICAT,INST SPACE,TULLAHOMA,TN 37388. RI Davis, Lloyd/D-7648-2013 OI Davis, Lloyd/0000-0002-3169-3044 NR 42 TC 137 Z9 138 U1 1 U2 13 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD JUN PY 1993 VL 57 IS 6 BP 972 EP 977 DI 10.1111/j.1751-1097.1993.tb02957.x PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA LL336 UT WOS:A1993LL33600008 ER PT J AU DALE, VH ONEILL, RV PEDLOWSKI, M SOUTHWORTH, F AF DALE, VH ONEILL, RV PEDLOWSKI, M SOUTHWORTH, F TI CAUSES AND EFFECTS OF LAND-USE CHANGE IN CENTRAL RONDONIA, BRAZIL SO PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING LA English DT Article ID DEFORESTATION; AMAZONIA; DECAY; CO2 AB Land-use change is one of the major factors affecting global environmental conditions. Modeling land-use change requires combining spatially explicit ecological information with socioeconomic factors. A modeling system has been developed that integrates sub-models of human colonization and ecological interactions to estimate patterns and rates of deforestation under different immigration and land management scenarios. The simulation modeling system is being applied to the Brazilian state of Rondonia where deforestation has increased at a faster rate over the past two decades than anywhere else in the world. The model projections suggest that appropriate land management can both reduce carbon release and improve the length of time farmers are able to remain successfully on the land. The model provides a tool to evaluate the implications of various land management options. Analysis of field interviews with farmers from central Rondonia indicates that the model does represent much of the land-use dynamics as well as points out aspects of the system where the model needs improvements. Together, the model and data suggest that land-use changes in central Rondonia are a function of lot size, land-use history, initial soil and vegetation conditions, land-use choices (planting annual, perennial, or pasture), market conditions, and effects of illness on work. C1 OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831. RP DALE, VH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Dale, Virginia/B-6023-2009 NR 39 TC 80 Z9 84 U1 4 U2 19 PU AMER SOC PHOTOGRAMMETRY PI BETHESDA PA 5410 GROSVENOR LANE SUITE 210, BETHESDA, MD 20814-2160 SN 0099-1112 J9 PHOTOGRAMM ENG REM S JI Photogramm. Eng. Remote Sens. PD JUN PY 1993 VL 59 IS 6 BP 997 EP 1005 PG 9 WC Geography, Physical; Geosciences, Multidisciplinary; Remote Sensing; Imaging Science & Photographic Technology SC Physical Geography; Geology; Remote Sensing; Imaging Science & Photographic Technology GA LH904 UT WOS:A1993LH90400011 ER PT J AU BALESTRINO, G MILANI, E VARLAMOV, AA AF BALESTRINO, G MILANI, E VARLAMOV, AA TI EFFECTS OF REDOX THERMAL TREATMENTS ON THE TRANSVERSE RESISTANCE PEAK AT THE EDGE OF THE SUPERCONDUCTING TRANSITION IN BI2SR2CACU2O8+X SO PHYSICA C LA English DT Article ID CRYSTALS; DENSITY AB The growth of the transverse resistivity just above the transition in Bi2Sr2CaCu2O8+x (BSCCO 2212) expitaxial films is studied in the framework of the recent fluctuation model proposed by Ioffe, Larkin, Varlamov and Yu Lu. The effects of different redox thermal treatments on the transverse resistive peak is investigated. The fit of the experimental curves with the theory is good and allows one to estimate the values of some physical parameters included in the theory itself (namely the in-plane Fermi velocity v(F), the carrier lifetime tau and the hopping integral w). It is shown that the oxidizing thermal treatment gives rise to a strong decrease in the transverse resistance peak just above T(c). Such effect is ascribed to the increase in v(F) due to the growth of the carrier concentration induced by the oxidizing treatment. Effects on the carrier lifetime and the hopping integral are hindered by the large variation of v(F). C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BALESTRINO, G (reprint author), UNIV ROMA TOR VERGATA,DIPARTIMENTO INGN MECCAN,VIA O RAIMONDO,I-00173 ROME,ITALY. NR 13 TC 24 Z9 24 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1993 VL 210 IS 3-4 BP 386 EP 390 DI 10.1016/0921-4534(93)90981-U PG 5 WC Physics, Applied SC Physics GA LG461 UT WOS:A1993LG46100011 ER PT J AU WAGNER, JL RADAELLI, PG HINKS, DG JORGENSEN, JD MITCHELL, JF DABROWSKI, B KNAPP, GS BENO, MA AF WAGNER, JL RADAELLI, PG HINKS, DG JORGENSEN, JD MITCHELL, JF DABROWSKI, B KNAPP, GS BENO, MA TI STRUCTURE AND SUPERCONDUCTIVITY OF HGBA2CUO4+DELTA SO PHYSICA C LA English DT Article ID NEUTRON-DIFFRACTION; YBA2CU3O7-DELTA AB We have used neutron powder diffraction to investigate the defect structure of HgBa2CuO4+delta. An interstitial oxygen defect in the Hg plane is the primary doping mechanism. A superconducting transition temperature, T(conset), of 95 K is achieved when approximately 0.06 oxygen atoms per formula unit are incorporated at this site by annealing the sample at 500-degrees-C in pure oxygen. Annealing in argon at 500-degrees-C lowers the oxygen content in this site to approximately 0.01 and results in a T(c) of 59 K. The neutron powder diffraction data give evidence for a second defect in the Hg plane which we conclude involves the substitution of copper for about 8% of the mercury and the incorporation of additional oxygen (approximately 0.1 atoms per formula unit), presumably bonded to the copper defects. In the present samples, the concentration of this defect does not vary with synthesis conditions and its contribution to doping is, therefore, unclear. The structure of the compound is the same at room temperature and superconducting temperatures. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP WAGNER, JL (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 11 TC 283 Z9 283 U1 1 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1993 VL 210 IS 3-4 BP 447 EP 454 DI 10.1016/0921-4534(93)90989-4 PG 8 WC Physics, Applied SC Physics GA LG461 UT WOS:A1993LG46100019 ER PT J AU CHEN, MH AF CHEN, MH TI DIELECTRONIC RECOMBINATION COEFFICIENTS FOR NI-LIKE TANTALUM SO PHYSICAL REVIEW A LA English DT Article AB Dielectronic-recombination (DR) rate coefficients for the ground state of Ni-like Ta45+ have been calculated for the electron temperatures in the range 0.02 < T < 10 keV. The calculations were carried out in the isolated resonance approximation using the multiconfiguration Dirac-Fock model in intermediate coupling with configuration interaction. The total DR rate coefficients were obtained by including the contributions from the 3s, 3p, and 3d excitations. The rate coefficients are found to peak at very low temperature (approximately 80 eV) with a value of 3.58 X 10(-10) cm3/sec and reduce to 1.48 X 10(-10) cm3/sec at T = 1 keV. RP CHEN, MH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 10 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1993 VL 47 IS 6 BP 4775 EP 4778 DI 10.1103/PhysRevA.47.4775 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LF727 UT WOS:A1993LF72700032 ER PT J AU DJURIC, N BELL, EW GUO, XQ DUNN, GH PHANEUF, RA BANNISTER, ME PINDZOLA, MS GRIFFIN, DC AF DJURIC, N BELL, EW GUO, XQ DUNN, GH PHANEUF, RA BANNISTER, ME PINDZOLA, MS GRIFFIN, DC TI ABSOLUTE CROSS-SECTIONS FOR ELECTRON-IMPACT SINGLE IONIZATION OF SI+ AND SI-2+ SO PHYSICAL REVIEW A LA English DT Article ID IRON IONS; GAS IONS; EXCITATION; CL-5+; AR-6+; S-4+ AB Absolute cross sections for electron-impact single ionization of Si+ and Si2+ have been measured using crossed beams of ions and electrons and calculated using a configuration-average distorted-wave method. Corrections have been made for metastable components and small fractions of nitrogen impurities in the incident ion beams. Excitation-autoionization measurably enhances the cross sections of both Si+ and Si2+. Ionization rate coefficients and fitting parameters are presented for the experimental data. C1 NATL INST STAND & TECHNOL, BOULDER, CO 80309 USA. INST PHYS, YU-11001 BELGRADE, YUGOSLAVIA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. AUBURN UNIV, DEPT PHYS, AUBURN, AL 36849 USA. ROLLINS COLL, WINTER PK, FL 32789 USA. RP UNIV COLORADO, JOINT INST LAB ASTROPHYS, BOULDER, CO 80309 USA. NR 30 TC 16 Z9 16 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1993 VL 47 IS 6 BP 4786 EP 4793 DI 10.1103/PhysRevA.47.4786 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LF727 UT WOS:A1993LF72700034 ER PT J AU MORIBAYASHI, K HINO, K MATSUZAWA, M KIMURA, M AF MORIBAYASHI, K HINO, K MATSUZAWA, M KIMURA, M TI HYPERSPHERICAL APPROACH TO DOUBLE-ELECTRON EXCITATION OF HE BY FAST-ION IMPACT .4. EXCITATION TO THE (2L, 3L') AND (3L, 3L') MANIFOLDS BY MULTIPLY-CHARGED-ION IMPACT SO PHYSICAL REVIEW A LA English DT Article ID EXCITED-STATES; ATOMS; IONIZATION AB Double-electron excitation processes to (2l,3l') and (3l,3l') manifolds of He atoms by multiply-charged-ion impact have been theoretically investigated using a close-coupling method at the 1.5-MeV/u incident energy. Hyperspherical wave functions are adopted to take full account of strongly correlated motion of two atomic electrons in He. For the excitation processes to the (2l, 3l') manifold, the cross sections to the 1D(e) states show the most rapid increase as projectile charge Z(p) increases, while that to the 1P(o) states indicate the slowest. For the 3l3l' excitation processes, the cross sections to the 1D(e) and 1P(o) states increase at almost the same rate. It is found that the isomorphism of the charge-density plots of the channel wave functions between the initial and final states governs collision dynamics in direct double-electron excitation processes when incident multiply charged ions strongly interact with the target He atoms. C1 UNIV ELECTROCOMMUN,DEPT APPL PHYS & CHEM,CHOFU,TOKYO 182,JAPAN. ARGONNE NATL LAB,ARGONNE,IL 60439. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP MORIBAYASHI, K (reprint author), INST MOLEC SCI,DIV THEORET STUDIES,OKAZAKI,AICHI 444,JAPAN. NR 10 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1993 VL 47 IS 6 BP 4874 EP 4876 DI 10.1103/PhysRevA.47.4874 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LF727 UT WOS:A1993LF72700045 ER PT J AU PINDZOLA, MS GORCZYCA, TW BOTTCHER, C AF PINDZOLA, MS GORCZYCA, TW BOTTCHER, C TI 2-PHOTON IONIZATION OF LITHIUM IN THE TIME-DEPENDENT HARTREE-FOCK APPROXIMATION SO PHYSICAL REVIEW A LA English DT Article ID ION-ATOM COLLISIONS; MULTIPHOTON IONIZATION; FIELD; HYDROGEN AB The two-photon ionization rate for the lithium atom is calculated in the time-dependent Hartree-Fock approximation for a variety of intensities and photon frequencies. The time-dependent equation for the valence Hartree-Fock orbital is solved on a two-dimensional cylindrical-coordinate lattice using both fixed and variable grid spacings. The nonperturbative results are compared with previous perturbation-theory results at photon energies near the 2s --> 3p single-photon resonance. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37830. RP PINDZOLA, MS (reprint author), AUBURN UNIV,DEPT PHYS,AUBURN,AL 36849, USA. NR 20 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1993 VL 47 IS 6 BP 4982 EP 4985 DI 10.1103/PhysRevA.47.4982 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LF727 UT WOS:A1993LF72700057 ER PT J AU SCHIFFER, JP AF SCHIFFER, JP TI RECOIL-FREE ABSORPTION AND SCATTERING OF LIGHT FROM CONFINED CRYSTALLINE IONIC SYSTEMS SO PHYSICAL REVIEW A LA English DT Note ID ONE-COMPONENT PLASMA AB Conditions for Bragg scattering are derived for ''crystalline'' ionic systems as found in ion traps and potentially in storage rings. The effective ''Debye temperature'' for such systems is also estimated. C1 UNIV CHICAGO,CHICAGO,IL 60637. RP SCHIFFER, JP (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1993 VL 47 IS 6 BP 5193 EP 5195 DI 10.1103/PhysRevA.47.5193 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LF727 UT WOS:A1993LF72700080 ER PT J AU AGOSTINI, P DIMAURO, LF AF AGOSTINI, P DIMAURO, LF TI SPACE LOCALIZATION AND BOUND-STATE POPULATION IN SHORT-PULSE RESONANT MULTIPHOTON IONIZATION SO PHYSICAL REVIEW A LA English DT Note ID ATOMIC-HYDROGEN; FIELD AB A numerical analysis using the resolvent-operator method shows that the space and time localization of ionization is in fact the key needed to understand the residual population that is left in the excited state in Stark-induced resonant multiphoton ionization. The two viewpoints recently opposed in the literature [G. N. Gibson, R. R. Freeman, and T. J. McIllrath, Optics and Photonics News 3, 22 (1992)] are therefore compatible. However, the excited-state population can easily be destroyed if the resonance intensity or the pulse duration is increased. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP AGOSTINI, P (reprint author), CENS,SERV RECH SURFACES & IRRADIAT MAT,F-91191 GIF SUR YVETTE,FRANCE. NR 10 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1993 VL 47 IS 6 BP R4573 EP R4576 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LF727 UT WOS:A1993LF72700007 ER PT J AU POLIAN, A GRIMSDITCH, M AF POLIAN, A GRIMSDITCH, M TI SOUND VELOCITIES AND REFRACTIVE-INDEX OF DENSIFIED ALPHA-SIO2 TO 25 GPA SO PHYSICAL REVIEW B LA English DT Article ID VITREOUS SILICA; ROOM-TEMPERATURE; AMORPHOUS SIO2; HIGH-PRESSURE AB Using Brillouin scattering we have measured the two independent elastic moduli of a-SiO2 with increasing and decreasing pressures up to 25 GPa. For descending pressures the shear constant shows irreversible behavior similar to that previously reported for the longitudinal mode. Although the bulk modulus at a given pressure can be evaluated from the measured elastic constants, the irreversible changes which occur on densification preclude the possibility of evaluating the density as a function of pressure by an integration of the compressibility. An estimate of the density is obtained indirectly from the measured refractive index. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP POLIAN, A (reprint author), UNIV PARIS 06,T 13 E 4,B 77,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE. RI Polian, Alain/E-1555-2017 OI Polian, Alain/0000-0003-2261-9114 NR 23 TC 32 Z9 32 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 JUN 1 PY 1993 VL 47 IS 21 BP 13979 EP 13982 DI 10.1103/PhysRevB.47.13979 PG 4 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900001 ER PT J AU LAWSON, JK PAYNE, SA AF LAWSON, JK PAYNE, SA TI EXCITED-STATE ABSORPTION OF EU-2+-DOPED MATERIALS SO PHYSICAL REVIEW B LA English DT Article ID OPTICAL-ABSORPTION; ALKALI-HALIDES; PHOTOIONIZATION; CRYSTALS; EU-2+; EUROPIUM; SPECTRA; LASER; GAIN; IONS AB We have investigated the excited-state absorption spectra of four Eu2+-doped materials: CaF2, SrF2, SrCl2, and LiCaAlF6. The excited-state absorption in the emission region of each material is similar in nature to that previously observed for CaF2, and is suggested to arise from a 5d --> (conduction band) transition. An electrostatic model for the onset of this type of transition is successful in predicting trends among different hosts. RP LAWSON, JK (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,L-490,LIVERMORE,CA 94550, USA. NR 39 TC 44 Z9 44 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 JUN 1 PY 1993 VL 47 IS 21 BP 14003 EP 14010 DI 10.1103/PhysRevB.47.14003 PG 8 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900005 ER PT J AU SZOKE, A AF SZOKE, A TI ELECTRON-DIFFRACTION SPECTROSCOPY AND THE HOLOGRAPHIC INVERSE PROBLEM SO PHYSICAL REVIEW B LA English DT Article ID EMISSION HOLOGRAPHY; LEED; CRYSTALLOGRAPHY; INTENSITIES; SCATTERING AB Holography-based methods have recently been proposed by the author for the solution of crystal structures in x-ray crystallography. Similar methods are proposed here for the solution of surface structures from low-energy-electron-diffraction (LEED), diffuse LEED, and electron-emission holograms. Our derivation highlights the close connection between the recovery of sur-face structures and the inverse problem of holography. Our methods may extend and simplify the use of existing algorithms for the solution of surface structures. They may eliminate many of the artifacts found in existing methods, including twin images. RP SZOKE, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 30 Z9 30 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14044 EP 14048 DI 10.1103/PhysRevB.47.14044 PG 5 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900010 ER PT J AU FEDRO, AJ KOELLING, DD AF FEDRO, AJ KOELLING, DD TI INTERPLAY BETWEEN BAND-STRUCTURE AND GAP SYMMETRY IN A 2-DIMENSIONAL ANISOTROPIC SUPERCONDUCTOR SO PHYSICAL REVIEW B LA English DT Article ID OXIDES AB We consider the two-dimensional quasiparticle density of states and superconductor-insulator-superconductor (SIS) tunneling conductance, sigma(V), using a BCS-like framework for a gap function exhibiting the symmetries of an unspecified off-site pairing interaction. For d-wave pairing, we find the usual nodal structure in the gap function. In addition, one can also find nodal structure at the Fermi surface for a gap function with extended s-wave symmetry (but only when hopping beyond near neighbors is considered). This is a universal feature arising solely due to the interplay between the Fermi-surface geometry and the momentum variation of the gap function and leads to unique signatures in the SIS tunneling spectra. C1 NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP FEDRO, AJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 20 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14342 EP 14347 DI 10.1103/PhysRevB.47.14342 PG 6 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900050 ER PT J AU FALICOV, LM PROETTO, CR AF FALICOV, LM PROETTO, CR TI TEST OF THE BARDEEN-COOPER-SCHRIEFFER AND THE RESONANT-VALENCE-BOND WAVE-FUNCTIONS AS SOLUTIONS OF THE HUBBARD-MODEL - A SMALL-CLUSTER CALCULATION SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; MEAN-FIELD-THEORY AB With the purpose of assessing the validity of commonly used approximations, best variational solutions are calculated for a four-site (tetrahedral-cluster) Hubbard model with periodic boundary conditions and compared with exact results. In particular, the optimum number-conserving Bardeen-Cooper-Schrieffer-type variational solution is obtained for two, four, and six electrons, and the optimal resonating-valence-bond state for four electrons. For an attractive interaction U, the exact ground state of the system is obtained in all four cases. If the interaction U is repulsive, the exact ground state is obtained only when the cluster contains two and six electrons. For four electrons the BCS approximation is only satisfactory for relatively small U. For any positive U the resonating-valence-bond state on the other hand, gives very good (albeit not exact) energies for the ground state. C1 COMIS NACL ENERGIA ATOM,INST BALSEIRO,RIO NEGRO,ARGENTINA. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP FALICOV, LM (reprint author), COMIS NACL ENERGIA ATOM,CTR ATOM BARILOCHE,8400 S C BARILOCHE,RIO NEGRO,ARGENTINA. NR 20 TC 5 Z9 5 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14407 EP 14412 DI 10.1103/PhysRevB.47.14407 PG 6 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900057 ER PT J AU THOMPSON, JR SUN, YR CIVALE, L MALOZEMOFF, AP MCELFRESH, MW MARWICK, AD HOLTZBERG, F AF THOMPSON, JR SUN, YR CIVALE, L MALOZEMOFF, AP MCELFRESH, MW MARWICK, AD HOLTZBERG, F TI EFFECT OF FLUX-CREEP ON THE TEMPERATURE-DEPENDENCE OF THE CURRENT-DENSITY IN Y-BA-CU-O CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-RELAXATION; SINGLE-CRYSTAL; THERMAL FLUCTUATIONS; II SUPERCONDUCTORS; ACTIVATION-ENERGY; IRREVERSIBILITY; TRANSPORT; PHASE AB Temperature-dependent critical current density and normalized flux-creep rate, together with the current dependence of the vortex pinning energy, were studied in as-grown and proton-irradiated Y-Ba-Cu-O crystals. A consistent interpretation is found within the collective-pinning or vortex-glass models. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP THOMPSON, JR (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 32 TC 93 Z9 93 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14440 EP 14447 DI 10.1103/PhysRevB.47.14440 PG 8 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900062 ER PT J AU FLESHLER, S KWOK, WK WELP, U VINOKUR, VM SMITH, MK DOWNEY, J CRABTREE, GW AF FLESHLER, S KWOK, WK WELP, U VINOKUR, VM SMITH, MK DOWNEY, J CRABTREE, GW TI ANISOTROPY AND LORENTZ-FORCE DEPENDENCE OF TWIN-BOUNDARY PINNING AND ITS EFFECT ON FLUX-LATTICE MELTING IN SINGLE-CRYSTAL YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; VORTEX-GLASS SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; RESISTIVE TRANSITION; FIELD; LIQUIDS; MOTION; Y1BA2CU3O7-X; VORTICES; STATE AB The magnetoresistance of both twinned and detwinned single crystals of YBa2Cu3O7-delta was Measured as a function of magnetic field strength, orientation, and temperature to determine the pinning properties of twin boundaries and their effect on the flux-lattice melting transition. Pinning by twin boundaries manifests itself as a drop in the resistance for magnetic fields oriented within a ''depinning angle'' of the twin boundaries. The onset of twin-boundary pinning is found to occur at the shoulder observed in the low-temperature end of the magnetic-field-broadened resistive transition for H parallel-to c. Two unique current to twin-boundary configurations were employed to induce vortex motion parallel or perpendicular to the twin boundaries when the magnetic field is parallel to the c axis. We find the drop in the angular-dependent resistance, the depinning angle, and the zero-resistance temperature to be enhanced when the vortices move normal to the twin boundaries indicating that the pinning barriers for this direction of flux motion are significantly larger. The depinning angle for rotations off the c axis decreases with increasing magnetic field and decreasing temperature whereas for rotations in the ab plane it is nearly field independent. For applied magnetic fields less than 4 T the depinning angle for H rotated off c is larger than that for H parallel-to ab. Strong pinning by twin boundaries competes with the flux-lattice melting transition for tilt angles less than the depinning angle, totally suppressing the transition for H parallel-to c. For small misalignments off the twin boundaries a second kink is observed which marks the onset of non-Ohmic behavior and which we interpret as the flux-lattice melting transition. For angles larger than the depinning angle the field-broadenend resistive transition and the flux-lattice melting transition of twinned and detwinned crystals are shown to be essentially identical. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. RP FLESHLER, S (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 45 TC 111 Z9 111 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 JUN 1 PY 1993 VL 47 IS 21 BP 14448 EP 14461 DI 10.1103/PhysRevB.47.14448 PG 14 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900063 ER PT J AU SUN, YR THOMPSON, JR CHEN, YJ CHRISTEN, DK GOYAL, A AF SUN, YR THOMPSON, JR CHEN, YJ CHRISTEN, DK GOYAL, A TI STRONG EVIDENCE FOR VORTEX-GLASS COLLECTIVE-PINNING THEORY IN YBA2CU3O7 SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; FLUX-CREEP; MAGNETIC-RELAXATION; DEPENDENCE; ACTIVATION; MOTION; STATE AB Magnetization studies on a melt textured-growth sample of YBa2Cu3O7-delta have tested several theoretical models to see which of them best describes the relaxation of supercurrents in this high-T(c) superconductor. By combining conventional flux-creep experiments with measurements of magnetization versus magnetic-field sweep rate, we are able to detect the decay of magnetization in both its intermediate and very early stages, thereby expanding the observational window up to 5-6 decades of time. Among four recent models tested, only vortex-glass-collective-pinning theory consistently describes both stages. The resulting values for the characteristic exponent mu strongly depend on temperature and magnetic field. Values for the effective hopping time for vortices, t(eff) , are approximately 0.1 s. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SUN, YR (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 25 TC 32 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14481 EP 14488 DI 10.1103/PhysRevB.47.14481 PG 8 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900067 ER PT J AU WANG, YY ZHANG, H DRAVID, VP SHI, D HINKS, DG ZHENG, Y JORGENSEN, JD AF WANG, YY ZHANG, H DRAVID, VP SHI, D HINKS, DG ZHENG, Y JORGENSEN, JD TI EVOLUTION OF THE LOW-ENERGY EXCITATIONS AND DIELECTRIC FUNCTION OF BA1-XKXBIO3(0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.50) SO PHYSICAL REVIEW B LA English DT Article ID TC SUPERCONDUCTOR BA1-XKXBIO3; ELECTRONIC-STRUCTURE; BI2SR2CACU2O8; BAPB1-XBIXO3; YBA2CU3O7-X; TRANSITION; DENSITY; STATES; SYSTEM; BABIO3 AB Evolution of the low-energy excitations and dielectric function of Ba1-xKxBiO3 (BKBO) single crystals in the doping range 0 less-than-or-equal-to x less-than-or-equal-to 0.50, i.e., spanning the semiconductor to superconductor regimes, is investigated by electron-energy-loss spectroscopy (EELS) with a cold-field-emission-gun transmission-electron microscope (cFEG TEM). A free-carrier plasmon in BKBO is observed by transmission EELS for x greater-than-or-equal-to 0. 40 (superconductor phase), and a local excitation for x less-than-or-equal-to 0. 3 (insulator-semiconductor phase). The oscillator strength of the excitation in the low-loss region increases substantially and abruptly between x =0.30 and x =0.40, signaling the semiconductor-metal transition. Subtle but important changes are observed in the higher-loss regions (bulk plasma) with K doping. The evolution of the low-energy excitations and dielectric function of BKBO is compared to that of cuprate superconductors. C1 NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCONDUCT,EVANSTON,IL 60208. ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WANG, YY (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Dravid, Vinayak/B-6688-2009 NR 43 TC 13 Z9 13 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14503 EP 14509 DI 10.1103/PhysRevB.47.14503 PG 7 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900070 ER PT J AU IVLEV, BI CAMPBELL, LJ AF IVLEV, BI CAMPBELL, LJ TI FLUX-CHAIN BUCKLING IN LAYERED SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID VORTEX LATTICE AB When a magnetic field is perpendicular to the c axis of a layered high-T(c) superconductor the phenomenon of flux-chain buckling near twin planes has been found. Both numerical simulation and an analytical approach based on vortex-lattice instability give similar conclusions. The period of the buckled structure is estimated and results are in qualitative agreement with experimental observations. C1 LOS ALAMOS NATL LAB,NATL HIGH MAGNET FIELD LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP IVLEV, BI (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS-B262,LOS ALAMOS,NM 87545, USA. NR 5 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14514 EP 14518 DI 10.1103/PhysRevB.47.14514 PG 5 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900072 ER PT J AU SMITH, SD SPONTAK, RJ SATKOWSKI, MM ASHRAF, A LIN, JS AF SMITH, SD SPONTAK, RJ SATKOWSKI, MM ASHRAF, A LIN, JS TI MICRODOMAIN CONTRACTION IN MICROPHASE-SEPARATED MULTIBLOCK COPOLYMERS SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-WEIGHT DEPENDENCE; DOMAIN-BOUNDARY STRUCTURE; POLYMER FILMS CAST; BLOCK CO-POLYMERS; BULK; INTERPHASE; SYSTEMS AB Linear multiblock copolymers, like their diblock analogs, undergo microphase separation and order into periodic morphologies when the blocks are sufficiently incompatible. To explore the conformations of such materials, four symmetric poly(styrene-b-isoprene), copolymers with 2n (1 less-than-or-equal-to n less-than-or-equal-to 4) perfectly alternating blocks of nearly equal mass have been synthesized. Small-angle x-ray scattering reveals that the microdomain periodicity decreases with n along the lamellar normal, thereby confirming theoretical predictions and providing direct evidence for bridging among the 2(n - 1) middle blocks. C1 N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SMITH, SD (reprint author), PROCTER & GAMBLE CO,DIV CORP RES,CINCINNATI,OH 45239, USA. NR 28 TC 20 Z9 20 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14555 EP 14558 DI 10.1103/PhysRevB.47.14555 PG 4 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900080 ER PT J AU KLEMM, RA AF KLEMM, RA TI LOWER CRITICAL-FIELD OF A SUPERCONDUCTOR WITH UNIAXIAL ANISOTROPY SO PHYSICAL REVIEW B LA English DT Note ID II SUPERCONDUCTOR; COMPOUND; VORTEX; MODEL AB Exact transformation of the Ginzburg-Landau free energy with uniaxial anisotropy and a variational procedure are used to calculate accurately the line energy of a single magnetic vortex for arbitrary stiffness kappa(perpendicular-to) and anisotropy gamma. The lower critical field H(c1)(thetaH) can exhibit a discontinuity, a kink, or be monotonic. Comparisons with experiment are made, and materials likely to exhibit such anomalies are suggested. The effective core cross section in the anisotropic London model is found. RP KLEMM, RA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 22 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 21 BP 14630 EP 14633 DI 10.1103/PhysRevB.47.14630 PG 4 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900100 ER PT J AU JORGENSEN, JD RADAELLI, PG HINKS, DG WAGNER, JL KIKKAWA, S ER, G KANAMARU, F AF JORGENSEN, JD RADAELLI, PG HINKS, DG WAGNER, JL KIKKAWA, S ER, G KANAMARU, F TI STRUCTURE OF SUPERCONDUCTING SR0.9LA0.1CUO2 (TC = 42-K) FROM NEUTRON POWDER DIFFRACTION SO PHYSICAL REVIEW B LA English DT Note ID HIGH-PRESSURE; X-RAY; OXYGEN; SYSTEM; EXCESS AB We have refined the crystal structure of the electron-doped infinite-layer superconducting compound Sr0.9La0.1CuO2 (T(c) = 42 K) from neutron-powder-diffraction data for an 82-mg sample synthesized at high pressure. The metal- and oxygen-atom lattices are perfectly stoichiometric and there is no excess (interstitial) oxygen in the Sr(La) layer. Thus, neither oxygen vacancies nor interstitial oxygen play a role in the doping of this compound. C1 OSAKA UNIV,INST SCI & IND RES,IBARAKI,OSAKA 567,JAPAN. RP JORGENSEN, JD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Kikkawa, Shinichi/A-7482-2012; Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 19 TC 78 Z9 78 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 JUN 1 PY 1993 VL 47 IS 21 BP 14654 EP 14656 DI 10.1103/PhysRevB.47.14654 PG 3 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900106 ER PT J AU SYTSMA, J PIEHLER, D EDELSTEIN, NM BOATNER, LA ABRAHAM, MM AF SYTSMA, J PIEHLER, D EDELSTEIN, NM BOATNER, LA ABRAHAM, MM TI 2-PHOTON EXCITATION OF THE 4F1 -] 5D1 TRANSITIONS OF CE3+ IN LUPO4 AND YPO4 SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC RAMAN-SCATTERING; POLARIZATION DEPENDENCE; ABSORPTION; CE-3+; INTENSITIES; SPECTROSCOPY; LAF3; CAF2 AB Two-photon excitation (TPE) spectra of the 4f1 --> 5d1 transitions of Ce3+ in LuPO4 and YPO4 have been investigated. For Ce3+ in LuPO4, transitions to four out of the five 5d1 levels are observed as zero-phonon lines. The symmetry properties of the levels were obtained from the polarization dependence of the TPE signals, Measurements on Ce3+ in YPO4 support the given assignments. Although a crystal-field fit yields a satisfactory rms energy deviation, an unrealistic value of the spin-orbit coupling parameter, zeta5d1, is obtained. The vibronic coupling appears to be smaller than for the single-photon absorption spectra, and the vibronic bands show a rich structure. There are striking differences between the energies and the relative intensities of the vibronic lines and the associated zero-phonon lines. The vibronic coupling is also found to be strongly dependent on the Ce3+ concentration. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. LAWRENCE LIVERMORE NATL LAB,GLENN T SEABORG INST TRANSACTINIUM SCI,LIVERMORE,CA 94550. RP SYTSMA, J (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 48 TC 20 Z9 20 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 14786 EP 14794 DI 10.1103/PhysRevB.47.14786 PG 9 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100011 ER PT J AU JANKOWIAK, R SMALL, GJ AF JANKOWIAK, R SMALL, GJ TI SPECTRAL DIFFUSION OF MOLECULAR ELECTRONIC-TRANSITIONS IN AMORPHOUS SOLIDS - WEAK AND STRONG 2-LEVEL-SYSTEM PHONON COUPLING SO PHYSICAL REVIEW B LA English DT Article ID HOLE-BURNING LINEWIDTHS; LOW-TEMPERATURE GLASS; OPTICAL-TRANSITIONS; PHOTON-ECHO; HOMOGENEOUS LINEWIDTHS; ORGANIC GLASSES; FLUORESCENCE LINEWIDTHS; THERMAL-CONDUCTIVITY; POLYMER GLASSES; ETHANOL GLASS AB The two-level-system (TLS) model of glasses is used with nonphenomenological TLS distribution functions [R. Jankowiak et al., J. Phys. Chem. 90, 3896 (1986)] to account for the time-dependent spectral-diffusion data for cresyl violet and zinc porphin in ethanol glasses at low temperatures [K. A. Littau and M. D. Fayer, Chem. Phys. Lett. 176, 551 (1991); H. C. Meijers and D. A. Wiersma, Phys. Rev. Lett. 68, 381 (1992)]. The two distributions of faster and slower TLS relaxation rates required to fit the data are characterized for both weak and strong TLS-phonon coupling. Comparison of the values obtained for the TLS parameters with those determined earlier for specific heat, thermal conductivity, pure dephasing, and spontaneous filling of nonphotochemical holes establishes that the faster and slower distributions are associated with intrinsic and extrinsic TLS. The pronounced effects of strong coupling on the TLS relaxation-rate distributions are discussed. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP JANKOWIAK, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 65 TC 18 Z9 18 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 14805 EP 14812 DI 10.1103/PhysRevB.47.14805 PG 8 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100013 ER PT J AU WANG, CZ HO, KM CHAN, CT AF WANG, CZ HO, KM CHAN, CT TI STRUCTURE AND DYNAMICS OF LIQUID CARBON SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; AMORPHOUS-CARBON; CARBYNE FORMS; TEMPERATURE; PRESSURE; GRAPHITE; EXISTENCE; SILICON; MODEL AB Structural, dynamical, and electronic properties of liquid carbon are studied by molecular-dynamics simulation with the use of a well-tested tight-binding Hamiltonian. We demonstrate that tight-binding molecular dynamics has sufficient efficiency and accuracy for a realistic simulation study of complex carbon systems. Our extensive simulation results show that liquid carbon at low density is metallic and dominated by twofold and threefold atoms. On the other hand, the high-density liquid is found to exhibit considerable diamondlike tetrahedral bonding. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. RP WANG, CZ (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 27 TC 44 Z9 48 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 14835 EP 14841 DI 10.1103/PhysRevB.47.14835 PG 7 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100016 ER PT J AU WANG, DS WU, RQ FREEMAN, AJ AF WANG, DS WU, RQ FREEMAN, AJ TI 1ST-PRINCIPLES THEORY OF SURFACE MAGNETOCRYSTALLINE ANISOTROPY AND THE DIATOMIC-PAIR MODEL SO PHYSICAL REVIEW B LA English DT Article ID THIN-FILM MAGNETISM; FERROMAGNETIC-FILMS; SPIN ANISOTROPY; BAND MODEL; ENERGY; METAL; MONOLAYERS; COBALT AB The state-tracking method proposed recently is employed for the first-principles determination of the magnetocrystalline-anisotropy (MCA) energy. A close relationship of the MCA energy to the band structure is found for transition-metal monolayers that show the change of sign of the MCA with respect to the band filling (atomic species) to be determined mainly by the spin-orbit coupling within the spin-down bands. The Fe monolayer with the pi-bonding band as the highest occupied band exhibits positive MCA (easy axis along the layer normal). However, the effect of strain on the MCA of the Fe monolayer demonstrates the effect of the spin-orbit coupling between opposite-spin states. A model for the electronic origin of the magnetic anisotropy of this two-dimensional system is presented that explains the first-principles MCA results for iron and cobalt monolayers on the basis of the bonding character between two d atoms, the band broadening due to increase in coordination, and geometry (symmetry). C1 ACAD SINICA,INST PHYS,BEIJING 100080,PEOPLES R CHINA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WANG, DS (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Wu, Ruqian/C-1395-2013 OI Wu, Ruqian/0000-0002-6156-7874 NR 38 TC 225 Z9 226 U1 4 U2 25 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 14932 EP 14947 DI 10.1103/PhysRevB.47.14932 PG 16 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100027 ER PT J AU ROSOV, N LYNN, JW RADOUSKY, HB BENNAHMIAS, M GOODWIN, TJ KLAVINS, P SHELTON, RN AF ROSOV, N LYNN, JW RADOUSKY, HB BENNAHMIAS, M GOODWIN, TJ KLAVINS, P SHELTON, RN TI CRYSTAL-STRUCTURE AND MAGNETIC-ORDERING OF THE RARE-EARTH AND CU MOMENTS IN RBA2CU2NBO8 (R = ND,PR) SO PHYSICAL REVIEW B LA English DT Article ID SM; OXYGEN; ND; GD; PR; SUPERCONDUCTIVITY; ER AB Using neutron diffraction, we have studied the crystal structure and magnetic ordering of the rare-earth and Cu moments in the layered perovskite systems NdBa2Cu2NbO8 (Nd 2:2:1:8) and PrBa2Cu2NbO8 (Pr 2:2:1:8). These are systems similar to RBa2Cu3O6+, [R 1:2:3:(6+x)] for which the chain Cu-O layers have been fully replaced by layers of Nb-O octahedra. Powder profile refinements below 20 K show that both Nd 2:2:1:8 and Pr 2:2:1:8 are in space group I4/mcm, because the near-neighbor Nb-O octahedra are rotated about the c axis in opposite senses. The Cu moments are ordered below 375(10) K for Nd 2:2:1:8 and 340(15) K for Pr 2:2:1:8, with saturation moments in both cases of 0.5(1)mu(B). The near-neighbor Cu spins are aligned antiparallel, just as for the Cu ''plane'' ordering in R 1:2:3:(6+x). The rare-earth moments order at 1.69(5) and 12.6(1) K for Nd 2:2:1:8 and Pr 2:2:1:8, respectively, with saturated values of [mu(z)] =0.74(5)mu(B) and 1.2(1)mu(B). The near-neighbor R spins, both in the ab plane and along the c axis, are also aligned antiparallel. As in the case of Pr 1:2:3:(6+x), the Pr sublattice of Pr 2:2:1:8 has an ordering temperature that is much higher than other rare-earth moments in these layered perovskites, suggesting that the Pr in Pr 2:2:1:8 experiences the same f-electron hybridization as has been observed in Pr 1:2:3:(6+x). The rare-earth ordering of both Nd 2:2:1:8 and Pr 2:2:1:8 is not completely three-dimensional in nature: rather, the ordering within the a-b plane is two-dimensional with only short-range order along the c axis. The presence of oxygen defects appears to affect the c-axis correlation length. C1 UNIV MARYLAND,CTR SUPERCOND RES,DEPT PHYS,COLL PK,MD 20742. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP ROSOV, N (reprint author), NATL INST STAND & TECHNOL,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899, USA. NR 31 TC 26 Z9 26 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 15256 EP 15264 DI 10.1103/PhysRevB.47.15256 PG 9 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100058 ER PT J AU BRINGLEY, JF SCOTT, BA LAPLACA, SJ MCGUIRE, TR MEHRAN, F MCELFRESH, MW COX, DE AF BRINGLEY, JF SCOTT, BA LAPLACA, SJ MCGUIRE, TR MEHRAN, F MCELFRESH, MW COX, DE TI STRUCTURE AND PROPERTIES OF THE LACUO3-DELTA PEROVSKITES SO PHYSICAL REVIEW B LA English DT Article ID COPPER; PHASES; OXIDES AB The high-pressure synthesis and electric and magnetic properties of the LaCuO3-delta system have been studied. The copper valence can be varied in this oxygen-defect perovskite almost continuously from + 3 to + 2, and three distinct ordered phases are observed over its 0.0 less-than-or-equal-to delta less-than-or-equal-to 0. 5 stability field. A tetragonal phase exists over the composition range 0.0 < delta less-than-or-equal-to 0.2, and the structure of a sample with 8 = 0.05 was refined by high-resolution synchrotron powder x-ray diffraction in space group P4/m, with a = 3.818 97(4), c = 3.972 58(6), and R = 0.0812. The tetragonal phase and also a monoclinic form stable between 0.2 less-than-or-equal-to delta less-than-or-equal-to 0.4 are metallic with room-temperature resistivities of (1.0- 3.0) X 10(-3) OMEGA cm. The phase is orthorhombic for larger delta, becoming an insulator as delta-->0.5. Superconductivity was not observed in any of the metallic samples. Ferromagnetic behavior is observed in the tetragonal materials, but the moment disappears at the delta congruent-to 0.2 phase boundary. The small moment is attributed to the existence of a canted antiferromagnetic array in the tetragonal phase. The results are discussed within the contexts of schematic band models and rationalized in terms of one in which the Fermi level moves through partially overlapping copper 3d(x2-y2) and oxygen pi(2p(perpendicular-to)* bands as delta increases. C1 IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 20 TC 43 Z9 43 U1 2 U2 14 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 15269 EP 15275 DI 10.1103/PhysRevB.47.15269 PG 7 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100060 ER PT J AU JOHNSON, JD BURLESON, GR EDWARDS, C ELGHOSSAIN, M ESPY, MA GARNETT, R HUSSEIN, A JOHNSON, K MOORE, CF MORRIS, CL ODONNELL, JM PALARCZYK, M RAWOOLSULLIVAN, M WARD, H WATSON, D WHITLEY, C WILLIAMS, AL AF JOHNSON, JD BURLESON, GR EDWARDS, C ELGHOSSAIN, M ESPY, MA GARNETT, R HUSSEIN, A JOHNSON, K MOORE, CF MORRIS, CL ODONNELL, JM PALARCZYK, M RAWOOLSULLIVAN, M WARD, H WATSON, D WHITLEY, C WILLIAMS, AL TI SEARCH FOR AN ETA-BOUND STATE IN PION DOUBLE CHARGE-EXCHANGE ON O-18 SO PHYSICAL REVIEW C LA English DT Article ID NUCLEI AB The search for an eta bound state in the double charge exchange (DCX) reaction to the double isobaric analog state (DIAS) 180(pi+,pi-)Ne-18(DIAS) has been carried out at LAMPF using the P3 channel and the LAS spectrometer. An excitation function for this reaction was measured for energies ranging from 350 to 440 MeV and for momentum transfers of 0, 105, and 210 MeV/c. The measured cross sections tend to agree with previous results for DCX on 0-18. The measured excitation function shows some evidence for structure near the eta production threshold. C1 KING FAHD UNIV PETR & MINERALS,DHAHRAN 31261,SAUDI ARABIA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. UNIV PENN,PHILADELPHIA,PA 19104. UNIV YORK,YORK YO1 5DD,N YORKSHIRE,ENGLAND. RP JOHNSON, JD (reprint author), UNIV TEXAS,AUSTIN,TX 78712, USA. NR 11 TC 22 Z9 23 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 JUN PY 1993 VL 47 IS 6 BP 2571 EP 2573 DI 10.1103/PhysRevC.47.2571 PG 3 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600019 ER PT J AU HINDI, MM SUR, B WEDDING, KL BARDAYAN, DW CZERWINSKI, KR DACRUZ, MTF HOFFMAN, DC LARIMER, RM LESKO, KT NORMAN, EB AF HINDI, MM SUR, B WEDDING, KL BARDAYAN, DW CZERWINSKI, KR DACRUZ, MTF HOFFMAN, DC LARIMER, RM LESKO, KT NORMAN, EB TI BETA+ DECAY AND COSMIC-RAY HALF-LIFE OF NB-91 SO PHYSICAL REVIEW C LA English DT Article AB In the laboratory, Nb-91 decays by electron capture with a 680-yr half-life. However, as a high energy cosmic ray, it would be stripped of its atomic electrons and would be able to undergo only beta+ decay. We produced and chemically purified a sample of Nb-91 and observed its decay with an array of Ge and NaI detectors. By following the beta+ annihilation radiation, we were able to determine the beta+ branching ratios of both the 105-keV, 61-d isomer and the ground state of Nb-91. The ground-state branch is (7.7 +/- 0.8) x 10(-3)%, leading to a beta+ partial half-life of (8.8 +/- 1.9) x 10(6) yr. Such a value of the half-life makes Nb-91 a good candidate for determining the confinement time of this secondary component of the cosmic rays. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. QUEENS UNIV,DEPT PHYS,KINGSTON K7L 9N6,ON,CANADA. UNIV SAO PAULO,INST PHYS,SAO PAULO,BRAZIL. RP HINDI, MM (reprint author), TENNESSEE TECHNOL UNIV,DEPT PHYS,COOKEVILLE,TN 38505, USA. NR 13 TC 4 Z9 4 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 JUN PY 1993 VL 47 IS 6 BP 2598 EP 2603 DI 10.1103/PhysRevC.47.2598 PG 6 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600022 ER PT J AU REHM, KE GLAGOLA, BG KUTSCHERA, W WOLFS, FLH WUOSMAA, AH AF REHM, KE GLAGOLA, BG KUTSCHERA, W WOLFS, FLH WUOSMAA, AH TI NEUTRON TRANSFER-REACTIONS AT LARGE DISTANCES SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION REACTIONS; MEDIUM-WEIGHT PROJECTILES; CROSS-SECTIONS; QUASIELASTIC PROCESSES; SI-28+PB-208 REACTION; COULOMB BARRIER; NUCLEON; SYSTEM; NI-58; S-36 AB Ni-58-induced one- and two-neutron transfer reactions have been measured on Th-232 at E(lab) = 500 MeV. The transfer probabilities at large internuclear distances measured for the deformed Th-232 target are compared with similar data on spherical Pb-208. For one-neutron transfer reactions good agreement between experiment and the prediction from the tunneling model is observed in both cases. The transfer probabilities for two-neutron transfer reactions deviate from the semiclassical predictions. The disagreement increases at higher bombarding energies. These deviations can be explained by the influence of diffractive effects which become more important at higher bombarding energies. RP REHM, KE (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 47 TC 29 Z9 29 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 JUN PY 1993 VL 47 IS 6 BP 2731 EP 2739 DI 10.1103/PhysRevC.47.2731 PG 9 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600037 ER PT J AU SMITH, MS MAGNUS, PV HAHN, KI CURLEY, RM PARKER, PD WANG, TF REHM, KE FERNANDEZ, PB SANDERS, SJ GARCIA, A ADELBERGER, EG AF SMITH, MS MAGNUS, PV HAHN, KI CURLEY, RM PARKER, PD WANG, TF REHM, KE FERNANDEZ, PB SANDERS, SJ GARCIA, A ADELBERGER, EG TI GAMMA-WIDTH OF O-14-ASTERISK(5.17 MEV) AND THE STELLAR N-13(P, GAMMA)O-14 REACTION-RATE SO PHYSICAL REVIEW C LA English DT Article ID HOT-CNO CYCLE; N-13(P,GAMMA)O-14 CROSS-SECTION; ENERGIES; O-14 AB We have determined the gamma-ray branching ratio GAMMA(gamma)/GAMMA(tot) for the first excited state in O-14 (E(x) = 5.17 MeV) to be (3.1 +/- 1.7) X 10(-4), corresponding to a gamma width of 12 +/- 7 eV. This value was determined by measuring the ratio of the N-14(p, n)O-14(0) to N-14(p, n)O-14(1) cross sections via neutron time of flight, and the ratio of N-14(p, n)O-14(0) to N-14(p, n)O-14(1)(gamma)O-14(0) cross sections at the same center-of-mass energy by bombarding a hydrogen target with a N-14 beam and kinematically distinguishing the O-14(0) recoils from the two reaction channels. The present value for GAMMA(gamma) is consistent with other measurements at the 2-sigma level; a weighted mean of all measurements is used to calculate the stellar N-13(p, gamma)O-14 reaction rate, and thereby determine the temperatures and densities at which the stellar carbon-nitrogen-oxygen (CNO) cycle is converted to the hot CNO cycle. C1 YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV KANSAS,DEPT PHYS & ASTRON,LAWRENCE,KS 66045. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. NR 33 TC 12 Z9 13 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 JUN PY 1993 VL 47 IS 6 BP 2740 EP 2750 DI 10.1103/PhysRevC.47.2740 PG 11 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600038 ER PT J AU POURANG, R WATSON, JW ABEGG, R AHMAD, M ALFORD, WP ANDERSON, BD BALDWIN, AR CELLER, A FREKERS, D HAUSSER, O HELMER, R HENDERSON, R HICKS, K JEPPESEN, R JACKSON, KP KING, NSP MADEY, R MILLER, CA MOINESTER, M VETTERLI, MC YEN, S AF POURANG, R WATSON, JW ABEGG, R AHMAD, M ALFORD, WP ANDERSON, BD BALDWIN, AR CELLER, A FREKERS, D HAUSSER, O HELMER, R HENDERSON, R HICKS, K JEPPESEN, R JACKSON, KP KING, NSP MADEY, R MILLER, CA MOINESTER, M VETTERLI, MC YEN, S TI HIGH-SPIN STRETCHED STATES EXCITED IN (N,P) REACTIONS AT 300 MEV SO PHYSICAL REVIEW C LA English DT Article ID ENERGY-DEPENDENCE; HOLE STATES; SCATTERING; SI-28; EXCITATION AB Differential cross sections were measured and compared to distorted-wave impulse-approximation calculations for the J(pi) = 4-(vd5/2,pip3/2(-1)) state excited in the C-12(n,p)B-12 (4.52 MeV) reaction, the J(pi) = 6-(v,f7/2pid5/2(-1)) state excited in the Si-28(n,p)Al-28 (5.175 MeV) reaction, and the J(pi) = 10-(vh11/2,pig9/2(-1)) state excited in the Sn-120(n,p)In-120 (congruent-to 0.0 MeV) reaction at 300 MeV. We obtained a normalization factor of 0.68 for the J(pi) = 10-(vh11/2,pig9/2(-1)) state excited in Sn-120(n,p)In-120 (congruent-to 0.0 MeV) reaction; this is the first ''1homegaBAR'' stretched state known in this mass region. C1 UNIV WESTERN ONTARIO,DEPT PHYS,LONDON N6A 3K7,ONTARIO,CANADA. KENT STATE UNIV,DEPT PHYS,KENT,OH 44242. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. SIMON FRASER UNIV,DEPT PHYS,BURNABY V5A 1S6,BC,CANADA. UNIV MELBOURNE,SCH PHYS,PARKVILLE,VIC 3052,AUSTRALIA. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 22 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1993 VL 47 IS 6 BP 2751 EP 2758 DI 10.1103/PhysRevC.47.2751 PG 8 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600039 ER PT J AU CANTO, LF RING, P SUN, Y RASMUSSEN, JO CHU, SY STOYER, MA AF CANTO, LF RING, P SUN, Y RASMUSSEN, JO CHU, SY STOYER, MA TI DIABOLIC EFFECTS ON NUCLEAR ROTATIONAL STATE POPULATION IN 2-NEUTRON TRANSFER SO PHYSICAL REVIEW C LA English DT Article ID PAIR TRANSFER; COULOMB-EXCITATION AB We refine the theoretical treatment of two-neutron transfer between deformed nuclei of the rare-earth region and a heavy spherical nucleus in the Pb region. The refinement from our previous work on effects of the Berry phase interference around the backbending region is that we now include the two lowest rotational bands of both the A and A + 2 nucleus rather than the lowest. The inclusion of two bands, ground and aligned, was earlier done by Dasso and Winther, who found diabolic interference effects to be small. We make numerical calculations on somewhat more favorable cases for experimental study, and we include nuclear optical potential effects and finite Q(rx) values. C1 TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CANTO, LF (reprint author), UNIV FED RIO DE JANEIRO,CAIXA POSTA 68528,BR-21945 RIO JANEIRO,BRAZIL. RI Canto, Luiz /I-3733-2012; Ring, Peter/O-1638-2015; Sun, Yang/P-2417-2015 NR 21 TC 11 Z9 11 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 JUN PY 1993 VL 47 IS 6 BP 2836 EP 2839 DI 10.1103/PhysRevC.47.2836 PG 4 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600048 ER PT J AU BEEDOE, S CARROLL, J FORCE, P GORDON, J HALLMAN, T IGO, G KIRK, PN KREBS, G LETESSIERSELVON, A MADANSKY, L MATIS, HS MILLER, D NAUDET, C ROCHE, G SCHROEDER, LS SEIDL, P WANG, ZF WELSH, R YEGNESWARAN, A AF BEEDOE, S CARROLL, J FORCE, P GORDON, J HALLMAN, T IGO, G KIRK, PN KREBS, G LETESSIERSELVON, A MADANSKY, L MATIS, HS MILLER, D NAUDET, C ROCHE, G SCHROEDER, LS SEIDL, P WANG, ZF WELSH, R YEGNESWARAN, A TI MEASUREMENT OF DIELECTRON PRODUCTION IN NIOBIUM-NIOBIUM COLLISIONS AT 1.05 GEV/NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; P-BE COLLISIONS; DILEPTON PRODUCTION; DEPENDENCE; RADIATION; MATTER; MASS AB A dielectron signal for pair masses greater than M(pi) is observed in Nb+Nb collisions at 1.05 GeV/nucleon beam kinetic energy. The invariant mass spectrum and the associated multiplicity distribution are presented. Comparisons are made with previous cross section measurements in p+Be and Ca+Ca. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CLERMONT FERRAND,INST NATL PHYS NUCL & PHYS PARTICULES,F-63177 CLERMONT FERRAND,FRANCE. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,NEWPORT NEWS,VA 23606. NORTHWESTERN UNIV,EVANSTON,IL 60201. NR 24 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1993 VL 47 IS 6 BP 2840 EP 2845 DI 10.1103/PhysRevC.47.2840 PG 6 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600049 ER PT J AU GARCIA, A CHAN, YD DACRUZ, MTF LARIMER, RM LESKO, KT NORMAN, EB STOKSTAD, RG WIETFELDT, FE ZLIMEN, I MOLTZ, DM BATCHELDER, J OGNIBENE, TJ HINDI, MM AF GARCIA, A CHAN, YD DACRUZ, MTF LARIMER, RM LESKO, KT NORMAN, EB STOKSTAD, RG WIETFELDT, FE ZLIMEN, I MOLTZ, DM BATCHELDER, J OGNIBENE, TJ HINDI, MM TI ELECTRON-CAPTURE DECAY OF TC-100 AND THE DOUBLE-BETA-DECAY OF MO-100 SO PHYSICAL REVIEW C LA English DT Article AB We have measured the electron-capture decay branch of Tc-100 to be (1.8 +/- 0.9) X 10(-3)%, from which we deduce log ft = 4.4(+0.18/-0.30). This indicates that a two-step process connecting only the ground states of Mo-100-Tc-100-Ru-100 Can account for the measured 2nu double-beta-decay rate of Mo-100. C1 TENNESSEE TECHNOL UNIV, DEPT PHYS, COOKEVILLE, TN 38505 USA. RP LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. OI Garcia, Alejandro/0000-0001-6056-6645 NR 15 TC 70 Z9 70 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1993 VL 47 IS 6 BP 2910 EP 2915 DI 10.1103/PhysRevC.47.2910 PG 6 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600055 ER PT J AU AUFDERHEIDE, MB BLOOM, SD RESLER, DA MATHEWS, GJ AF AUFDERHEIDE, MB BLOOM, SD RESLER, DA MATHEWS, GJ TI IMPLICATIONS OF THE RECENT CO-59(N,P)FE-59 EXPERIMENT FOR STELLAR ELECTRON-CAPTURE RATES SO PHYSICAL REVIEW C LA English DT Article ID WEAK-INTERACTION RATES; GAMOW-TELLER STRENGTH; INTERMEDIATE-MASS NUCLEI; SD-SHELL NUCLEI; COLLAPSE; CL-37 AB We study results from the recent measurement of the 0-degrees Co-59(n,p)Fe-59 cross section in order to compute the stellar electron capture rate of Co-59. This nucleus is the second most important electron capture nucleus in the core of a type II supernova progenitor just before core collapse. It is also the first nucleus which has a large effect on the stellar neutronization rate for which Gamow-Teller strength has been measured. The Gamow-Teller resonance has been observed experimentally at a higher energy above the daughter ground state than one would expect from independent particle shell model arguments, but large-basis shell model calculations employing configuration mixing are more successful in predicting the location of the strength. Because of the high energy of the Gamow-Teller resonance, the stellar electron capture rate and associated neutronization is much less than previous estimates had indicated. Similar trends are seen for Co-60, the most important electron capture nucleus for supernova progenitors just before core collapse. RP AUFDERHEIDE, MB (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 29 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1993 VL 47 IS 6 BP 2961 EP 2969 DI 10.1103/PhysRevC.47.2961 PG 9 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600061 ER PT J AU CEDERWALL, B DELEPLANQUE, MA AZAIEZ, F DIAMOND, RM FALLON, P KORTEN, W LEE, IY MACCHIAVELLI, AO OLIVEIRA, JRB STEPHENS, FS KELLY, WH VO, DT BECKER, JA BRINKMAN, MJ HENRY, EA HUGHES, JR KUHNERT, A STOYER, MA WANG, TF DRAPER, JE DUYAR, C RUBEL, E DEBOER, J AF CEDERWALL, B DELEPLANQUE, MA AZAIEZ, F DIAMOND, RM FALLON, P KORTEN, W LEE, IY MACCHIAVELLI, AO OLIVEIRA, JRB STEPHENS, FS KELLY, WH VO, DT BECKER, JA BRINKMAN, MJ HENRY, EA HUGHES, JR KUHNERT, A STOYER, MA WANG, TF DRAPER, JE DUYAR, C RUBEL, E DEBOER, J TI NEW OBLATE BAND IN HG-196 WITH QUENCHED M1 STRENGTH SO PHYSICAL REVIEW C LA English DT Note AB High-spin states in the nucleUs Hg-196 were populated in the reaction (Os(Be,5n))-Os-192 at a beam energy of 65 MeV. A regular rotational-like DELTAI = 1 band has been observed up to an excitation energy of E* almost-equal-to 8.7 MeV and spin I almost-equal-to 30hBAR. This is the second observation of a band of this character in a mercury isotope. The experimental results are compared with mean field calculations and semiclassical estimates based on the Donau-Frauendorf formalism. The mercury bands show significantly lower B(M1)/B(E2) branching ratios as compared with similar bands in light lead nuclei. This difference may be more readily explained by a difference in single-particle structure rather than by large differences in deformation between the lead and mercury configurations. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV MUNICH,W-8046 GARCHING,GERMANY. RP CEDERWALL, B (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Oliveira, Jose Roberto/J-3124-2012; KORTEN, Wolfram/H-3043-2013; Cederwall, Bo/M-3337-2014 OI Oliveira, Jose Roberto/0000-0003-1362-7382; Cederwall, Bo/0000-0003-1771-2656 NR 17 TC 16 Z9 16 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1993 VL 47 IS 6 BP R2443 EP R2446 PG 4 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600002 ER PT J AU SANGSTER, TC BEGEMANNBLAICH, M BLAICH, T BRITT, HC ELMAANI, A AJITANAND, NN NAMBOODIRI, MN AF SANGSTER, TC BEGEMANNBLAICH, M BLAICH, T BRITT, HC ELMAANI, A AJITANAND, NN NAMBOODIRI, MN TI FRAGMENT EMISSION TIME-SCALE IN INTERMEDIATE-ENERGY HEAVY-ION COLLISIONS SO PHYSICAL REVIEW C LA English DT Note ID PARTICLE-PARTICLE CORRELATIONS; INTENSITY INTERFEROMETRY; COMPOSITE NUCLEI AB Complete two-fragment velocity systematics have been measured over the entire range of fragmentation products for the system Fe-56 + Au-157 at 50 and 100 MeV per nucleon. Fragment emission lifetimes are estimated from the reduced velocity (V(rel) square-root Z1+Z2) correlation functions by a direct comparison with results from a classical three-body trajectory calculation. Furthermore, we examine the validity of the reduced velocity, V(red), as a scaling parameter for constructing mixed-fragment (Z1 not-equal Z2) correlation functions over the full measured range (5 less-than-or-equal-to Z(i,j) less-than-or-equal-to 53) of fragment pairs excluding fission. C1 GESELL SCHWERIONFORSCH MBH,W-6100 DARMSTADT,GERMANY. UNIV MAINZ,W-6500 MAINZ,GERMANY. SUNY,STONY BROOK,NY 11794. RP SANGSTER, TC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1993 VL 47 IS 6 BP R2457 EP R2461 PG 5 WC Physics, Nuclear SC Physics GA LF956 UT WOS:A1993LF95600005 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YI, C YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YI, C YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI STUDY OF 4-JET EVENTS AND EVIDENCE FOR DOUBLE PARTON INTERACTIONS IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW D LA English DT Article ID CROSS-SECTION; SCATTERING; COLLIDER; JETS; QCD; CDF; SUBPROCESS; TRIGGER; SYSTEM; QUARK AB Kinematic properties of four-jet events produced in ppBAR collisions at square-root s = 1.8 TeV have been studied using data with an integrated luminosity of 325 nb-1 collected using the Collider Detector at Fermilab during the 1988-1989 Fermilab Collider run. The individual jet p(T) spectra and the angles between each jet pair are compared to the predictions of leading-order quantum chromodynamics for the double gluon bremsstrahlung process and good agreement is observed. In addition, a search for double parton scattering has been undertaken using variables sensitive to the topology of four-jet events. A small double parton content provides the best description of the data. We find N(DP)/N(DB) = 5.4(-2.0)1.6%, where N represents the number of events attributed to each process. We measure sigma(DP) = 63(-28)+32 nb for jets having p(T) > 25 GeV/c in the pseudorapidity interval \eta\ < 3.5. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; NR 38 TC 121 Z9 122 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 4857 EP 4871 DI 10.1103/PhysRevD.47.4857 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700008 ER PT J AU BAUR, U BERGER, EL AF BAUR, U BERGER, EL TI PROBING THE WEAK-BOSON SECTOR IN Z-GAMMA PRODUCTION AT HADRON COLLIDERS SO PHYSICAL REVIEW D LA English DT Article ID E+E-ANNIHILATION; QCD PREDICTIONS; GAUGE-THEORIES; S-MATRIX; PHOTON; CONSTRAINTS; COLLISIONS; DERIVATION; COUPLINGS; TEVATRON AB A detailed analysis of Zgamma production at hadron colliders is presented for general ZZgamma and Zgammagamma couplings. Deviations from the standard model gauge theory structure can be parametrized in terms of four ZZgamma and four Zgammagamma form factors. The high-energy behavior of these form factors is severely restricted by unitarity. Prospects for testing the self-interactions of Z bosons and photons at the Fermilab Tevatron, the CERN Large Hadron Collider and the Superconducting Super Collider are explored. Sensitivity limits for anomalous ZZgamma and Zgammagamma couplings are derived and compared to bounds from low-energy data and e+e- collider experiments. C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP BAUR, U (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 57 TC 133 Z9 133 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 4889 EP 4904 DI 10.1103/PhysRevD.47.4889 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700011 ER PT J AU ANDERSON, J LUTY, MA AF ANDERSON, J LUTY, MA TI CHIRAL CORRECTIONS TO HYPERON VECTOR FORM-FACTORS SO PHYSICAL REVIEW D LA English DT Article ID PERTURBATION-THEORY; BARYON; DECAY AB We show that the leading chiral corrections to the DELTAS = 1 f1 vector form factors of hyperons are O(m(s)) and O(m(s) 3/2), and are expected to be approximately 20-30 % by dimensional analysis. This is consistent with the Ademollo-Gatto theorem. We compute the O(m(s)) corrections and a subset of the O(m(s)3/2) corrections using an effective Lagrangian in which the baryons are treated as heavy particles. All of these corrections are surprisingly small, approximately 5%; combining them, we obtain approximately 5-10 % corrections. The pattern of corrections is very different from that predicted by quark models. RP ANDERSON, J (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 14 TC 32 Z9 32 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 4975 EP 4980 DI 10.1103/PhysRevD.47.4975 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700018 ER PT J AU HEWETT, JL RIZZO, TG AF HEWETT, JL RIZZO, TG TI PROBING NEW GAUGE-BOSON COUPLINGS VIA 3-BODY DECAYS SO PHYSICAL REVIEW D LA English DT Article ID LEFT-RIGHT MODEL; HADRON COLLIDERS; STANDARD MODEL; FERMION PRODUCTION; VECTOR BOSONS; PHENOMENOLOGY; CONSTRAINTS; SIGNATURES; SECTOR; SIGNAL AB We examine the possibility of using rare, three-body decays of a new neutral gauge boson Z2 to probe its gauge couplings at hadron colliders. Specifically, we study the decays Z2-->Wlnu and Z2-->ZnunuBAR and find that much knowledge of the Z2 properties can be obtained from these processes. In particular, these decay modes can yield valuable information on the amount of Z1-Z2 mixing, on the generation dependence of the Z2 couplings, and on the properties of the new generator associated with the Z2, as well as being used to distinguish between possible extended models. Standard model backgrounds to these three-body decays are discussed, and we find that the rate for pp-->ZZ-->ZnunuBAR eclipses that of pp-->Z2-->ZnunuBAR at hadron supercolliders. The analogous three-body decays into a new, heavy charged gauge boson, Z2-->W2+/-l-/+ nu, are also investigated in models where this can occur. RP HEWETT, JL (reprint author), ARGONNE NATL LAB,HIGH ENERGY PHYS LAB,ARGONNE,IL 60439, USA. NR 60 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 4981 EP 4990 DI 10.1103/PhysRevD.47.4981 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700019 ER PT J AU RIZZO, TG AF RIZZO, TG TI LEPTON-NUMBER-VIOLATING RADIATIVE W-DECAY IN MODELS WITH R-PARITY VIOLATION SO PHYSICAL REVIEW D LA English DT Article ID SUPERSYMMETRIC THEORIES; COLLIDERS; BREAKING AB Models with explicit R-parity violation can induce new rare radiative decay modes of the W boson into single supersymmetric particles which also violate lepton number. We examine the rate and signature for one such decay, W-lgamma, and find that such a mode will be very difficult to observe, due to its small branching fraction, even if the lepton-number-violating coupling in the superpotential is comparable in strength to electromagnetism. The reason for this small rate is primarily due to the helicity suppression of the amplitude that results from the form of the allowed R-parity-violating couplings in this class of models. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 4991 EP 4994 DI 10.1103/PhysRevD.47.4991 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700020 ER PT J AU NEUBERT, M LIGETI, Z NIR, Y AF NEUBERT, M LIGETI, Z NIR, Y TI SUBLEADING ISGUR-WISE FORM-FACTOR CHI-3(UPSILON.UPSILON') TO ORDER A(S) IN QCD SUM-RULES SO PHYSICAL REVIEW D LA English DT Article ID EFFECTIVE FIELD-THEORY; QUARK EFFECTIVE THEORY; RESONANCE PHYSICS; HEAVY QUARKS; MESONS; DECAYS AB We calculate the contributions arising at order alpha(s) in the QCD sum rule for the spin-symmetry-violating universal function chi3(v.v'), Which appears at order 1/m(Q) in the heavy quark expansion of meson form factors. In particular, we derive the two-loop perturbative contribution to the sum rule. Over the kinematic range accessible in B --> D(*)lv decays, we find that chi3(v.v') does not exceed the level of approximately 1%, indicating that power corrections induced by the chromomagnetic operator in the heavy quark expansion are small. C1 WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. RP NEUBERT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 28 TC 24 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 5060 EP 5066 DI 10.1103/PhysRevD.47.5060 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700030 ER PT J AU GUPTA, R DANIEL, D KILCUP, GW PATEL, A SHARPE, SR AF GUPTA, R DANIEL, D KILCUP, GW PATEL, A SHARPE, SR TI KAON B-PARAMETER WITH WILSON FERMIONS SO PHYSICAL REVIEW D LA English DT Article ID 4-FERMION OPERATORS; LATTICE QCD; WEAK DECAYS; REGULARIZATION AB We calculate the kaon B parameter in quenched lattice QCD at beta=6.0 using Wilson fermions at kappa=0.154 and 0.155. We use two kinds of nonlocal (''smeared'') sources for quark propagators to calculate the matrix elements between states of definite momentum. The use of smeared sources yields results with much smaller errors than obtained in previous calculations with Wilson fermions. By combining results for p=(0,0,0) and p=(0,0,1), we show that one can carry out the noperturbative subtraction necessary to remove the dominant lattice artifacts induced by the chiral-symmetry-breaking term in the Wilson action. Our final results are in good agreement with those obtained using staggered fermions. We also present results for B parameters of the DELTAI = 3/2 part of the electromagnetic penguin operators, and preliminary results for B(K) in the presence of two flavors of dynamical quarks. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. INDIAN INST SCI,SUPERCOMP EDUC & RES CTR,BANGALORE 560012,KARNATAKA,INDIA. INDIAN INST SCI,CTR THEORET STUDIES,BANGALORE 560012,KARNATAKA,INDIA. UNIV WASHINGTON,DEPT PHYS FM-15,SEATTLE,WA 98195. RP GUPTA, R (reprint author), LOS ALAMOS NATL LAB,T-8,MS-B285,LOS ALAMOS,NM 87545, USA. RI Patel, Apoorva/F-4359-2010 NR 25 TC 37 Z9 37 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 5113 EP 5127 DI 10.1103/PhysRevD.47.5113 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700037 ER PT J AU AHLUWALIA, DV SAWICKI, M AF AHLUWALIA, DV SAWICKI, M TI FRONT-FORM SPINORS IN THE WEINBERG-SOPER FORMALISM AND GENERALIZED MELOSH TRANSFORMATIONS FOR ANY SPIN SO PHYSICAL REVIEW D LA English DT Article AB Using the Weinberg-Soper formalism we construct the front-form (j, 0) + (0,j) spinors. Explicit expressions for the generalized Melosh transformations up to spin two are obtained. The formalism, without explicitly invoking any wave equations, reproduces the spin-1/2 front-form results of Melosh, Lepage and Brodsky, and Dziembowski. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP AHLUWALIA, DV (reprint author), LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,MS H-844,LOS ALAMOS,NM 87545, USA. NR 22 TC 39 Z9 39 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1993 VL 47 IS 11 BP 5161 EP 5168 DI 10.1103/PhysRevD.47.5161 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE967 UT WOS:A1993LE96700041 ER PT J AU HOLIAN, BL POSCH, HA HOOVER, WG AF HOLIAN, BL POSCH, HA HOOVER, WG TI FREE-ENERGY VIA THERMOSTATTED DYNAMIC POTENTIAL-ENERGY CHANGES SO PHYSICAL REVIEW E LA English DT Article ID TEMPERATURE AB Three dynamical methods for computing canonical-ensemble Helmholtz free energies are discussed and compared for a thermostatted six-body harmonic chain. We use a Martyna-Klein-Tuckerman thermostat [J. Chem. Phys. 97, 2635 (1992)] with six time-reversible friction coefficients to study both single-trajectory and ensemble-averaged free-energy changes. Though all three dynamic methods produce identical long-time averages, the one based on Kirkwood's coupling-parameter theory [J. Chem. Phys. 3, 300 (1935)] converges much more rapidly than do the two based on time-integrated heat transfer. C1 UNIV VIENNA, INST EXPTL PHYS, A-1090 VIENNA, AUSTRIA. UNIV CALIF DAVIS LIVERMORE, DEPT APPL SCI, LIVERMORE, CA 94551 USA. LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94551 USA. RP LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 18 TC 13 Z9 13 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 3852 EP 3861 DI 10.1103/PhysRevE.47.3852 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200012 ER PT J AU JAMGOTCHIAN, H TRIVEDI, R BILLIA, B AF JAMGOTCHIAN, H TRIVEDI, R BILLIA, B TI ARRAY OF DOUBLETS - A BRANCH OF CELLULAR SOLUTIONS IN DIRECTIONAL SOLIDIFICATION SO PHYSICAL REVIEW E LA English DT Article ID SPACINGS; GROWTH; SHAPES; CELLS AB In directional solidification of alloys, the interface pattern assumes a cellular structure, with a periodic array of cells, when the velocity is increased beyond the threshold of planar interface instability. A detailed experimental study in the succinonitrile-acetone system has revealed a branch of cellular structure in which the interface pattern consists of a periodic array of coupled cells or doublets. This doublet interface evolves with two characteristic length scales at the advancing front: a small intraspacing between the cells in a doublet, whose selection is sharp, and a larger interspacing corresponding to the distance between cells in adjoining doublets, whose selection is weak. The dynamics of the time-dependent evolution of a doublet interface is investigated by statistical analysis of tip spacings, by using a Fourier transform of the interface shape and through the study of the variation of shape parameters with time. These dynamical studies have confirmed the selection of doublet interface as a stable solution of the cellular pattern formation. A range of stable regime for an array with doublets is determined and the key factor that controls the formation of regular cells or doublets in an array is discussed. When doublets are unstable, time dependency may follow due to a source mechanism at grain boundaries, which induces strong spatiotemporal chaos. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. UNIV DROIT,FAC SCI ST JEROME,MAT ORG & PROPRIETES LAB,F-13397 MARSEILLE 20,FRANCE. RP JAMGOTCHIAN, H (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 20 TC 46 Z9 48 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4313 EP 4322 DI 10.1103/PhysRevE.47.4313 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200063 ER PT J AU GOLDSTEIN, WH ZIGLER, A BURKHALTER, PG NAGEL, DJ BARSHALOM, A OREG, J LUK, TS MCPHERSON, A RHODES, CK AF GOLDSTEIN, WH ZIGLER, A BURKHALTER, PG NAGEL, DJ BARSHALOM, A OREG, J LUK, TS MCPHERSON, A RHODES, CK TI X-RAY-EMISSION FROM A 650-FS LASER-PRODUCED BARIUM PLASMA SO PHYSICAL REVIEW E LA English DT Article ID KRF-STAR LASER; INTENSITY; TARGETS; PULSES; GENERATION; HOT AB We have used x rays in the 9-15-angstrom band emitted from a solid target of BaF2 irradiated by approximately 120 mJ of 248-nm radiation in a 650-fs full width at half maximum Gaussian laser pulse to characterize spectroscopically the resulting ultrashort-pulse laser-produced plasma. The emission was spectrally resolved but space and time integrated. By comparing the spectrum with unresolved-transition-array calculations and measurements of plasma emission from longer-pulse experiments, it is clear that ions as highly stripped as titaniumlike barium are present. We have successfully modeled the observed spectrum by assuming an optically thin source in local thermodynamic equilibrium (LTE) and using the super-transition-array theory [A. Bar-Shalom et al., Phys. Rev. A 40, 3183 (1989)] for emission from a hot, dense plasma. The model indicates that the emitting region is at comparatively low temperature (200-300 eV) and high electron density (10(23)-10(24) cm-3). The degree of agreement between the model and the measured spectrum also suggests that the emitting plasma is near LTE. We conclude that the emission in this band arises from a solid-density plasma formed early in time, and is thus localized in both space and time. This interpretation is reinforced by LASNFX [G. B. Zimmerman and W. L. Kruer, Comments Plasma Phys. Controlled Fusion 11, 51 (1975)] simulations that indicate that emission in this band closely tracks the laser pulse. C1 USN,RES LAB,WASHINGTON,DC 20375. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. UNIV ILLINOIS,CHICAGO,IL 60680. RP GOLDSTEIN, WH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 24 TC 17 Z9 17 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4349 EP 4353 DI 10.1103/PhysRevE.47.4349 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200067 ER PT J AU WANG, CX AF WANG, CX TI CONCISE EXPRESSION OF A CLASSICAL RADIATION SPECTRUM SO PHYSICAL REVIEW E LA English DT Article ID UNDULATOR AB In this paper we present a concise expression of the classical electromagnetic radiation spectrum of a moving charge. It is shown to be equivalent to the often used and much more complicated form derived from the Lienard-Wiechert potentials when the observation distance R satisfies the condition R >> gammalambda. The expression reveals a relationship between the radiation spectrum and the motion of the radiation source. It also forms the basis of an efficient computing approach, which is of practical value in numerical calculations of the spectral output of accelerated charges. The advantages of this approach for analytical and numerical applications are discussed and the bending-magnet synchrotron radiation spectrum is calculated according to the approach. RP WANG, CX (reprint author), LAWRENCE BERKELEY LAB,ADV LIGHT SOURCE,BERKELEY,CA 94720, USA. NR 16 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4358 EP 4363 DI 10.1103/PhysRevE.47.4358 PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200069 ER PT J AU GLUCKSTERN, RL KRINSKY, S OKAMOTO, H AF GLUCKSTERN, RL KRINSKY, S OKAMOTO, H TI ANALYSIS OF THE SATURATION OF A HIGH-GAIN FREE-ELECTRON LASER SO PHYSICAL REVIEW E LA English DT Article ID WAVE AB We study the saturated state of an untapered free-electron laser (FEL) in the Compton regime, arising after exponential amplification of an initially low level of radiation by an initially monoenergetic, unbunched electron beam. The saturated state of the FEL is described by oscillations about an equilibrium state. Using the two invariants of the motion and certain assumptions motivated by computer simulations, we provide approximate analytic descriptions of the radiation field and electron distribution in the saturation regime. We first consider a one-dimensional approximation and later extend our approach to treat an electron beam of finite radial extent. Of note is a result on the radiated power in the case of an electron beam with a small radius. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP GLUCKSTERN, RL (reprint author), UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742, USA. NR 13 TC 11 Z9 13 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4412 EP 4429 DI 10.1103/PhysRevE.47.4412 PG 18 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200074 ER PT J AU LEE, SB FEIT, MD AF LEE, SB FEIT, MD TI SIGNATURES OF QUANTUM CHAOS IN WIGNER AND HUSIMI REPRESENTATIONS SO PHYSICAL REVIEW E LA English DT Note ID DRIVEN DAMPED PENDULUM; PHASE-SPACE; WAVE-PACKET; SCHRODINGER-EQUATION; FORCED PENDULUM; MECHANICS; DYNAMICS; MOTION; SYSTEMS; STATES AB In this paper, we study the quantum manifestations of classical chaos in phase space using Wigner and Husimi distribution functions. We test the claim that Husimi represents the correspondence better than Wigner does. The results show the claim is valid. We also use a quantum dissipation scheme empirically for classically damped motions often characterized by strange attractors. We believe quantum resemblance to classical distributions can be regarded as signatures of quantum chaos in phase space. C1 UNIV CALIF DAVIS LIVERMORE, DEPT APPL SCI, LIVERMORE, CA 94550 USA. RP LEE, SB (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. RI Feit, Michael/A-4480-2009 NR 41 TC 5 Z9 5 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1539-3755 EI 1550-2376 J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4552 EP 4555 DI 10.1103/PhysRevE.47.4552 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200085 ER PT J AU HERZENBERG, CI AF HERZENBERG, CI TI COMMENTS ON EUCLIDEAN SPACE-TIME CONCEPTS - ROLE OF THE DIMENSIONALLY LIMITED OBSERVER SO PHYSICS ESSAYS LA English DT Article DE SPACE-TIME; EUCLIDEAN SPACE-TIME; SPECIAL RELATIVITY; LORENTZ TRANSFORMATIONS; DIMENSIONALLY LIMITED OBSERVER AB Recent approaches to obtaining relativistic physics based on concepts of four-dimensional Euclidean space-time are addressed. Discussion of the characteristics and consequences of observation under dimensionally limited conditions is presented, A transformation is considered involving deformation of four-dimensional Euclidean space so that events simultaneous with respect to a scalar time parameter occur at the same reference time coordinate. Our study indicates that this approach can lead to relativistic results including the Lorentz transformations. A possible origin for dimensional limitation in observation is discussed. RP HERZENBERG, CI (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIV TORONTO PRESS INC PI TORONTO PA JOURNALS DIVISION, 5201 DUFFERIN ST, DOWNSVIEW, TORONTO ON M3H 5T8, CANADA SN 0836-1398 J9 PHYS ESSAYS JI Phys. Essays PD JUN PY 1993 VL 6 IS 2 BP 277 EP 288 PG 12 WC Physics, Multidisciplinary SC Physics GA MJ918 UT WOS:A1993MJ91800016 ER PT J AU FISCH, NJ RAX, JM AF FISCH, NJ RAX, JM TI FREE-ENERGY IN PLASMAS UNDER WAVE-INDUCED DIFFUSION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID VLASOV EQUILIBRIA AB When waves propagate through a bounded plasma, the wave may be amplified or damped at the expense of the plasma kinetic energy. In many cases of interest, the primary effect of the wave is to cause plasma diffusion in velocity and configuration space. In the absence of collisions, the rearrangement of the plasma conserves entropy, as large-grain structures are mixed and fine-grain structures emerge. The maximum extractable energy by waves so diffusing the plasma is a quantity of fundamental interest; it can be defined, but it is difficult to calculate. Through the consideration of specific examples, certain strategies for maximizing energy extraction are identified. C1 CENS,F-91191 GIF SUR YVETTE,FRANCE. RP FISCH, NJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 12 TC 17 Z9 17 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 JUN PY 1993 VL 5 IS 6 BP 1754 EP 1759 DI 10.1063/1.860809 PG 6 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300009 ER PT J AU CARRERAS, BA LYNCH, VE GARCIA, L AF CARRERAS, BA LYNCH, VE GARCIA, L TI EFFECT OF A POLOIDAL SHEAR-FLOW ON THE PROBABILITY OF ACCESSING THE MULTIPLE SATURATED STATES IN THE RESISTIVE INTERCHANGE INSTABILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; L-H TRANSITION; TOKAMAK; ROTATION AB A systematic study based on 400 nonlinear single-helicity calculations with random initial perturbations shows that multiple nonlinear states exist at saturation. They are characterized by different values of the poloidal wave number ot the dominant mode in the spectrum. As a consequence, the saturated states have different levels of fluctuations and different self-consistent poloidal flow profiles. The presence of an external shear poloidal flow does not always directly change the saturation level of the fluctuations. For low shear flows, it can increase the probability of accessing the high saturated levels. For very high values of the flow shear, however, there is suppression of the fluctuations. A curvature poloidal flow reduces the saturation level of each state and increases the probability of accessing the low fluctuation levels. Transitions between saturated states accompanied by sudden changes in flow profile have been observed. Most of the observed transitions are from a low to a high level of fluctuations. C1 UNIV COMPLUTENSE MADRID,MADRID 3,SPAIN. ASSOC CIEMAT EURATOM,MADRID,SPAIN. RP CARRERAS, BA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Lynch, Vickie/J-4647-2012; Garcia, Luis/A-5344-2015 OI Lynch, Vickie/0000-0002-5836-7636; Garcia, Luis/0000-0002-0492-7466 NR 13 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1795 EP 1803 DI 10.1063/1.860815 PG 9 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300015 ER PT J AU VU, HX PRINJA, AK AF VU, HX PRINJA, AK TI MULTIPLE EQUILIBRIA OF DIVERTOR PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAKS AB A one-dimensional, two-fluid transport model with a temperature-dependent neutral recycling coefficient is shown to give rise to multiple equilibria of divertor plasmas (bifurcation). Numerical techniques for obtaining these multiple equilibria and for examining their stability are presented. Although these numerical techniques have been well known to the scientific community, this is the first time they have been applied to divertor plasma modeling to show the existence of multiple equilibria as well as the stability of these solutions. Numerical and approximate analytical solutions,of the present one-dimensional transport model both indicate that there exists three steady-state solutions corresponding to (1) a high-temperature, low-density equilibrium, (2) a low-temperature, high-density equilibrium, and (3) an intermediate-temperature equilibrium. While both the low-temperature and the high-temperature equilibria are stable, with respect to small perturbations in the plasma conditions, the intermediate-temperature equilibrium is physically unstable, i.e., any small perturbation about this equilibrium will cause a transition toward either the high-temperature or low-temperature equilibrium. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. RP VU, HX (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1809 EP 1815 DI 10.1063/1.860817 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300017 ER PT J AU CHINFATT, C DESILVA, AW GOLDENBAUM, GC HESS, R COTE, C FILUK, A GAUVREAU, JL HWANG, FK AF CHINFATT, C DESILVA, AW GOLDENBAUM, GC HESS, R COTE, C FILUK, A GAUVREAU, JL HWANG, FK TI FORMATION AND DECAY OF A SPHEROMAK PLASMA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MAGNETIC RECONNECTION; CONFIGURATION; RELAXATION; EVOLUTION; HELICITY AB The magnetic properties of the spheromak configuration produced by a combination of slow theta and Z discharges in the University of Maryland Spheromak experiment (MS) are reported. The magnetic structure of the plasma in MS has been mapped out by arrays of passive magnetic pickup coils. The Taylor relaxation process is observed during the formation phase. The magnetic profile evolves in such a way that the ratio of poloidal current I(p) to poloidal flux psi in the plasma approaches a constant value, where mu0I(p) = k(el)psi. When the spheromak is formed, the magnetic field configuration is close to Taylor's minimum energy state, mu0j = kB. This constant k is related to the size of the spheromak produced. A spheromak with 1.0 T maximum field, corresponding to 650 kA poloidal current, has been produced in MS. However, due to the high plasma density (6-8 X 10(20) m-3 ) and the presence of low-Z impurities (mainly carbon and oxygen), the plasma is radiation dominated with electron temperature less-than-or-equal-to 15 eV. The magnetic field decays exponentially during the decay phase. Axisymmetric equilibrium states that could exist in the configuration are calculated with a Grad-Shafranov equilibrium code. Comparison of the numerical calculation with the experimental measurements indicates that the magnetic-field structure stays close to the equilibrium state as the plasma decays. C1 APPL PHYS LAB,LAUREL,MD 20723. NASA,GODDARD SPACE FLIGHT CTR,GSFC,GREENBELT,MD 20771. SANDIA NATL LABS,DIV 1271,ALBUQUERQUE,NM 87185. CCFM,VARENNES J3X 1S1,PQ,CANADA. NATL TAIWAN UNIV,DEPT PHYS,TAIPEI 11718,TAIWAN. RP CHINFATT, C (reprint author), UNIV MARYLAND,PLASMA RES LAB,COLL PK,MD 20742, USA. NR 24 TC 2 Z9 2 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1816 EP 1827 DI 10.1063/1.860818 PG 12 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300018 ER PT J AU SCHWAGER, LA AF SCHWAGER, LA TI EFFECTS OF SECONDARY AND THERMIONIC ELECTRON-EMISSION ON THE COLLECTOR AND SOURCE SHEATHS OF A FINITE ION TEMPERATURE PLASMA USING KINETIC-THEORY AND NUMERICAL-SIMULATION (VOL 5, PG 631, B, 1993) SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Correction, Addition RP SCHWAGER, LA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 1 U2 4 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 JUN PY 1993 VL 5 IS 6 BP 1926 EP 1926 DI 10.1063/1.860979 PG 1 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300033 ER PT J AU CHEMLA, DS AF CHEMLA, DS TI OPTICS OF NANOSTRUCTURES SO PHYSICS TODAY LA English DT Article C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP CHEMLA, DS (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 0 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1993 VL 46 IS 6 BP 22 EP 23 DI 10.1063/1.881351 PG 2 WC Physics, Multidisciplinary SC Physics GA LH897 UT WOS:A1993LH89700005 ER PT J AU CHEMLA, DS AF CHEMLA, DS TI NONLINEAR OPTICS IN QUANTUM-CONFINED STRUCTURES SO PHYSICS TODAY LA English DT Article ID WELL STRUCTURES; EXCITONS; TIME C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CHEMLA, DS (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 30 TC 15 Z9 16 U1 0 U2 4 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 JUN PY 1993 VL 46 IS 6 BP 46 EP 52 DI 10.1063/1.881354 PG 7 WC Physics, Multidisciplinary SC Physics GA LH897 UT WOS:A1993LH89700008 ER PT J AU TARNOW, E AF TARNOW, E TI AN ETHICS EXAM FOR PHYSICISTS EVERYWHERE SO PHYSICS TODAY LA English DT Letter RP TARNOW, E (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1993 VL 46 IS 6 BP 108 EP 108 DI 10.1063/1.2808948 PG 1 WC Physics, Multidisciplinary SC Physics GA LH897 UT WOS:A1993LH89700021 ER PT J AU SAUTER, M SEAGULL, RW KENDE, H AF SAUTER, M SEAGULL, RW KENDE, H TI INTERNODAL ELONGATION AND ORIENTATION OF CELLULOSE MICROFIBRILS AND MICROTUBULES IN DEEP-WATER RICE SO PLANTA LA English DT Article DE CELLULOSE MICROFIBRIL; GIBBERELLIN; INTERNODAL ELONGATION; MICROTUBULE; ORYZA (GROWTH) ID DEEP-WATER RICE; EPIDERMAL-CELL WALLS; VIGNA-ANGULARIS OHWI; GIBBERELLIN; GROWTH; ARRANGEMENT; COLEOPTILES; EPICOTYLS; PATTERNS; OHASHI AB Excised stem sections of deepwater rice (Oryza sativa L.) containing the highest internode were used to study the induction of rapid internodal elongation by gibberellin (GA). It has been shown before that this growth response is based on enhanced cell division in the intercalary meristem and on increased cell elongation. In both GA-treated and control stem sections, the basal 5-mm region of the highest internode grows at the fastest rate. During 24 h of GA treatment, the internodal elongation zone expands from 15 to 35 mm. Gibberellin does not promote elongation of internodes from which the intercalary meristem has been excised. The orientation of cellulose microfibrils (CMFs) is a determining factor in cell growth. Elongation is favored when CMFs are oriented transversely to the direction of growth while elongation is limited when CMFs are oriented in the oblique or longitudinal direction. The orientation of CMFs in parenchymal cells of GA-treated and control internodes is transverse throughout the internode, indicating that CMFs do not restrict elongation of these cells. Changes in CMF orientation were observed in epidermal cells, however. In the basal 5-mm zone of the internode, which includes the intercalary meristem, CMFs of the epidermal cell walls are transversely oriented in both GA-treated and control stem sections. In slowly growing control internodes, CMF orientation changes to the oblique as cells are displaced from this basal 5-mm zone to the region above it. In GA-treated rapidly growing internodes, the reorientation of CMFs from the transverse to the oblique is more gradual and extends over the 35-mm length of the elongation zone. The CMFs of older epidermal cells are obliquely oriented in control and GA-treated internodes. The orientation of the CMFs parallels that of the cortical microtubules. This is consistent with the hypothesis that cortical microtubules determine the direction of CMF deposition. We conclude that GA acts on cells that have transversely oriented CMFs but does not promote growth of cells whose CMFs are already obliquely oriented at the start of GA treatment. C1 MICHIGAN STATE UNIV,MSU DOE PLANT RES LAB,E LANSING,MI 48824. USDA ARS,SO REG LAB,SO REG RES CTR,NEW ORLEANS,LA 70124. NR 28 TC 61 Z9 66 U1 0 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0032-0935 J9 PLANTA JI Planta PD JUN PY 1993 VL 190 IS 3 BP 354 EP 362 PG 9 WC Plant Sciences SC Plant Sciences GA LE386 UT WOS:A1993LE38600009 ER PT J AU CHANG, CH RAMSHAW, JD AF CHANG, CH RAMSHAW, JD TI NUMERICAL SIMULATIONS OF ARGON PLASMA JETS FLOWING INTO COLD-AIR SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE TURBULENT PLASMA JETS; ARGON AIR PLASMAS ID TURBULENT FLOWS; COMPUTATION; BEHAVIOR; FLAMES; MODEL AB Computational results and comparisons with experimental data are presented for simulations of axisymmetric turbulent argon plasma jets flowing into a cold air environment. The calculations were performed using the LAVA code [J. D. Ramshaw and C. H. Chang, Plasma Chem. Plasma Process. 12, 299 (1992)], and were designed to simulate experiments performed by Brossa and Pfender [Plasma Chem. Plasma Process. 8, 75 (1988)] (BP) and by Fincke et al [private communication, 1992] (FSH). To our knowledge, these are the first such simulations in which multicomponent diffusion and interactions between dissociation and ionization of different species are consistently accounted for. Turbulence effects were represented by a standard k-epsilon model, both with and without an axisymmetric jet correction term and for several different choices of the turbulent Prandtl and Schmidt numbers Pr(t) and Sc(t). Simulations were performed for one FSH experiment and two BP experiments at different values of torch power P and argon flow rate W. The inflow profiles in the FSH simulations were adjusted to match P, W, and the experimental data slightly downstream of the torch exit as closely as possible. The same profile shapes were then used to match P and W for the BP simulations, for which data near the torch exit were not available. Swirl was neglected except in one of the FSH calculations, where it was found to have negligible effect, as expected. Best results were obtained with the axisymmetric jet correction term omitted and with Pr(t) = Sc(t) = 0.7. Agreement with the experimental data was then fair overall, but still showed systematic deviations and cannot be regarded as fully satisfactory. Possible reasons for the discrepancies are discussed. RP CHANG, CH (reprint author), EG&G IDAHO INC, IDAHO NATL ENGN LAB, POB 1625, IDAHO FALLS, ID 83415 USA. NR 46 TC 62 Z9 63 U1 1 U2 7 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4324 J9 PLASMA CHEM PLASMA P JI Plasma Chem. Plasma Process. PD JUN PY 1993 VL 13 IS 2 BP 189 EP 209 DI 10.1007/BF01466041 PG 21 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA LN515 UT WOS:A1993LN51500002 ER PT J AU SEABORG, GT AF SEABORG, GT TI MCMILLAN,EDWIN,MATTISON (SEPTEMBER 18, 1907, SEPTEMBER 7, 1991) + IN-MEMORIAM SO PROCEEDINGS OF THE AMERICAN PHILOSOPHICAL SOCIETY LA English DT Item About an Individual RP SEABORG, GT (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER PHILOSOPHICAL SOC PI PHILADELPHIA PA 104 SOUTH FIFTH ST, PHILADELPHIA, PA 19106-3387 SN 0003-049X J9 P AM PHILOS SOC JI Proc. Amer. Philos. Soc. PD JUN PY 1993 VL 137 IS 2 BP 285 EP 291 PG 7 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA LK458 UT WOS:A1993LK45800009 ER PT J AU BENNETT, CL BOGGESS, NW CHENG, ES HAUSER, MG KELSALL, T MATHER, JC MOSELEY, SH MURDOCK, TL SHAFER, RA SILVERBERG, RF SMOOT, GF WEISS, R WRIGHT, EL AF BENNETT, CL BOGGESS, NW CHENG, ES HAUSER, MG KELSALL, T MATHER, JC MOSELEY, SH MURDOCK, TL SHAFER, RA SILVERBERG, RF SMOOT, GF WEISS, R WRIGHT, EL TI SCIENTIFIC RESULTS FROM THE COSMIC BACKGROUND EXPLORER (COBE) SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE MICROWAVE; INFRARED ID DIFFERENTIAL MICROWAVE RADIOMETERS; INFLATIONARY UNIVERSE SCENARIO; SCALE ANISOTROPIES; RADIATION; SPECTRUM; LIGHT; PERTURBATIONS; FLUCTUATIONS; BOLOMETERS; FLATNESS AB The National Aeronautics and Space Administration (NASA) has flown the COBE satellite to observe the Big Bang and the subsequent formation of galaxies and large-scale structure. Data from the Far-Infrared Absolute Spectrophotometer (FIRAS) show that the spectrum of the cosmic microwave background is that of a black body of temperature T = 2.73 +/- 0.06 K, with no deviation from a black-body spectrum greater than 0.25% of the peak brightness. The data from the Differential Microwave Radiometers (DMR) show statistically significant cosmic microwave background anisotropy, consistent with a scale-invariant primordial density fluctuation spectrum. Measurements from the Diffuse Infrared Background Experiment (DIRBE) provide new conservative upper limits to the cosmic infrared background. Extensive modeling of solar system and galactic infrared foregrounds is required for further improvement in the cosmic infrared background limits. C1 GEN RES CORP, DANVERS, MA 01923 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. UNIV CALIF LOS ANGELES, DEPT ASTRON, LOS ANGELES, CA 90024 USA. RP BENNETT, CL (reprint author), NASA, GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. RI Moseley, Harvey/D-5069-2012 NR 104 TC 4 Z9 4 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN 1 PY 1993 VL 90 IS 11 BP 4766 EP 4773 DI 10.1073/pnas.90.11.4766 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF285 UT WOS:A1993LF28500002 PM 11607383 ER PT J AU DEVLIN, M ALSOP, D CLAPP, A COTTINGHAM, D FISCHER, M GUNDERSEN, J HOLMES, W LANGE, A LUBIN, P MEINHOLD, P RICHARDS, P SMOOT, G AF DEVLIN, M ALSOP, D CLAPP, A COTTINGHAM, D FISCHER, M GUNDERSEN, J HOLMES, W LANGE, A LUBIN, P MEINHOLD, P RICHARDS, P SMOOT, G TI PRELIMINARY-RESULTS FROM THE 3RD FLIGHT OF THE MILLIMETER ANISOTROPY EXPERIMENT (MAX) SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article; Proceedings Paper CT COLLOQUIUM ON PHYSICAL COSMOLOGY CY MAR 27-28, 1992 CL NATL ACAD SCI, IRVINE, CA SP NATL ACAD SCI HO NATL ACAD SCI AB Preliminary results from the June 1991 flight of MAX are presented. Simultaneous observations were made in bands centered at 6, 9, and 12 cm-1 with a bolometric receiver operating at 300 mK. The experimental sensitivities are the highest reported at angular scales of 0.3-degrees to 1.0-degrees. Interstellar dust is observed to have an emissivity is-proportional-to nu 1.4 +/- O.3 and to correlate with the Infrared Astronomical Satellite (IRAS) 100-mum map. After removal of emission from interstellar dust, 1.3 hr of integration on a 6-degrees scan yields an upper limit of temperature difference DELTAT/T < 2.6 x 10(-5) at a Gaussian autocorrelation function centered at 0.5-degrees. The experiment and data analysis are described. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. RP DEVLIN, M (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. RI Alsop, David/J-5764-2013 OI Alsop, David/0000-0002-8206-1995 NR 4 TC 11 Z9 11 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN 1 PY 1993 VL 90 IS 11 BP 4774 EP 4776 DI 10.1073/pnas.90.11.4774 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF285 UT WOS:A1993LF28500003 PM 11607384 ER PT J AU SCHRAMM, DN AF SCHRAMM, DN TI COSMOLOGICAL IMPLICATIONS OF LIGHT-ELEMENT ABUNDANCES - THEORY SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article; Proceedings Paper CT COLLOQUIUM ON PHYSICAL COSMOLOGY CY MAR 27-28, 1992 CL NATL ACAD SCI, IRVINE, CA SP NATL ACAD SCI HO NATL ACAD SCI ID BIG-BANG NUCLEOSYNTHESIS; PRIMORDIAL NUCLEOSYNTHESIS; EARLY UNIVERSE; NEUTRON LIFETIME; CROSS-SECTIONS; LITHIUM; ORIGIN; STARS; CONSTRAINTS; BERYLLIUM AB Primordial nucleosynthesis provides (with the microwave background radiation) one of the two quantitative experimental tests of the hot Big Bang cosmological model (versus alternative explanations for the observed Hubble expansion). The standard homogeneous-isotropic calculation fits the light element abundances ranging from H-1 at 76% and He-4 at 24% by mass through H-2 and He-3 at parts in 10(5) down to Li-7 at parts in 10(10). It is also noted how the recent Large Electron Positron Collider (and Stanford Linear Collider) results on the number of neutrinos (N(nu)) are a positive laboratory test of this standard Big Bang scenario. The possible alternate scenario of quark-hadron-induced inhomogeneities is also discussed. It is shown that when this alternative scenario is made to fit the observed abundances accurately, the resulting conclusions on the baryonic density relative to the critical density (OMEGA(b)) remain approximately the same as in the standard homogeneous case, thus adding to the robustness of the standard model and the conclusion that OMEGA(b) almost-equal-to 0.06. This latter point is the driving force behind the need for nonbaryonic dark matter (assuming total density OMEGA(total) = 1) and the need for dark baryonic matter, since the density of visible matter OMEGA(visible) < OMEGA(b). The recent Population II B and Be observations are also discussed and shown to be a consequence of cosmic ray spallation processes rather than primordial nucleosynthesis. The light elements and N(nu) successfully probe the cosmological model at times as early as 1 sec and a temperature (T) of almost-equal-to 10(10) K (almost-equal-to 1 MeV). Thus, they provided the first quantitative arguments that led to the connections of cosmology to nuclear and particle physics. C1 FERMILAB NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP SCHRAMM, DN (reprint author), UNIV CHICAGO,CTR ASTRON & ASTROPHYS 140,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 79 TC 2 Z9 2 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN 1 PY 1993 VL 90 IS 11 BP 4782 EP 4788 DI 10.1073/pnas.90.11.4782 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF285 UT WOS:A1993LF28500006 PM 11607387 ER PT J AU TURNER, MS AF TURNER, MS TI DARK MATTER - THEORETICAL PERSPECTIVES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article; Proceedings Paper CT COLLOQUIUM ON PHYSICAL COSMOLOGY CY MAR 27-28, 1992 CL NATL ACAD SCI, IRVINE, CA SP NATL ACAD SCI HO NATL ACAD SCI ID MINIMAL ISOCURVATURE MODEL; INVISIBLE AXION; GALAXY FORMATION; GALACTIC HALO; MISSING MASS; UNIVERSE; NEUTRINOS; SCALE; PARTICLES; NUMBER AB I both review and make the case for the current theoretical prejudice: a flat Universe whose dominant constituent is nonbaryonic dark matter, emphasizing that this is still a prejudice and not yet fact. The theoretical motivation for nonbaryonic dark matter is discussed in the context of current elementary-particle theory, stressing that (i) there are no dark-matter candidates within the ''standard model'' of particle physics, (ii) there are several compelling candidates within attractive extensions of the standard model of particle physics, and (iii) the motivation for these compelling candidates comes first and foremost from particle physics. The dark-matter problem is now a pressing issue in both cosmology and particle physics, and the detection of particle dark matter would provide evidence for ''new physics.'' The compelling candidates are a very light axion (10(-6)-10(-4) eV), a light neutrino (20-90 eV), and a heavy neutralino (10 GeV-2 TeV). The production of these particles in the early Universe and the prospects for their detection are also discussed. I briefly mention more exotic possibilities for the dark matter, including a nonzero cosmological constant, superheavy magnetic monopoles, and decaying neutrinos. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP TURNER, MS (reprint author), UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637, USA. NR 118 TC 10 Z9 10 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN 1 PY 1993 VL 90 IS 11 BP 4827 EP 4834 DI 10.1073/pnas.90.11.4827 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF285 UT WOS:A1993LF28500014 PM 11607395 ER PT J AU CULIAT, CT STUBBS, L NICHOLLS, RD MONTGOMERY, CS RUSSELL, LB JOHNSON, DK RINCHIK, EM AF CULIAT, CT STUBBS, L NICHOLLS, RD MONTGOMERY, CS RUSSELL, LB JOHNSON, DK RINCHIK, EM TI CONCORDANCE BETWEEN ISOLATED CLEFT-PALATE IN MICE AND ALTERATIONS WITHIN A REGION INCLUDING THE GENE ENCODING THE BETA(3)-SUBUNIT OF THE TYPE-A GAMMA-AMINOBUTYRIC-ACID RECEPTOR SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE DELETION MAPPING; P-LOCUS MUTATIONS; COMPLEMENTATION ANALYSIS; FACIAL DEVELOPMENT; COMPLEX SYNDROMES ID GROWTH FACTOR-ALPHA; MOUSE STRAINS; LIP; DIAZEPAM; GABA AB Genetic and molecular analyses of a number of radiation-induced deletion mutations of the pink-eyed dilution (p) locus in mouse chromosome 7 have identified a specific interval on the genetic map associated with a neonatally lethal mutation that results in cleft palate. This interval, closely linked and distal to p, and bracketed by the genes encoding the alpha5 and beta3 subunits of the type A gamma-aminobutyric acid receptor (Gabra5 and Gabrb3, respectively), contains a gene(s) (cp1; cleft palate 1) necessary for normal palate development. The cp1 interval extends from the distal breakpoint of the prenatally lethal p83FBFo deletion to the Gabrb3 locus. Among 20 p deletions tested, there was complete concordance between alterations at the Gabrb3 transcription unit and inability to complement the cleft-palate defect. These mapping data, along with previously described in vivo and in vitro teratological effects of gamma-aminobutyric acid or its agonists on palate development, suggest the possibility that a particular type A gamma-aminobutyric acid receptor that includes the beta3 subunit may be necessary for normal palate development. The placement of the cp1 gene within a defined segment of the larger D15S12h (p)-D15S9h-1 interval in the mouse suggests that the highly homologous region of the human genome, 15q11-q13, be evaluated for a role(s) in human fetal facial development. C1 OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD,SCH BIOMED SCI,OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV FLORIDA,DEPT NEUROSCI,GAINESVILLE,FL 32610. UNIV FLORIDA,COLL MED,DEPT PEDIAT,GAINESVILLE,FL 32610. NR 29 TC 62 Z9 62 U1 0 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN 1 PY 1993 VL 90 IS 11 BP 5105 EP 5109 DI 10.1073/pnas.90.11.5105 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF285 UT WOS:A1993LF28500069 PM 8389469 ER PT J AU TAYLOR, CB BARIOLA, PA DELCARDAYRE, SB RAINES, RT GREEN, PJ AF TAYLOR, CB BARIOLA, PA DELCARDAYRE, SB RAINES, RT GREEN, PJ TI RNS2 - A SENESCENCE-ASSOCIATED RNASE OF ARABIDOPSIS THAT DIVERGED FROM THE S-RNASES BEFORE SPECIATION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE RNASE SUPERFAMILY; SENESCENCE; PHOSPHATE STARVATION; S-LIKE RNASES ID AMINO-ACID-SEQUENCE; TOMATO LYCOPERSICON-ESCULENTUM; SELF-INCOMPATIBILITY GENE; NICOTIANA-ALATA; PHOSPHATE-STARVATION; RHIZOPUS-NIVEUS; RIBONUCLEASE; EXPRESSION; CELLS; PROTEINS AB Several self-compatible species of higher plants, such as Arabidopsis thaliana, have recently been found to contain S-like RNases. These S-like RNases are homologous to the S-RNases that have been hypothesized to control self-incompatibility in Solanaceous species. However, the relationship of the S-like RNases to the S-RNases is unknown, and their roles in self-compatible plants are not understood. To address these questions, we have investigated the RNS2 gene, which encodes an S-like RNase (RNS2) of Arabidopsis. Amino acid sequence comparisons indicate that RNS2 and other S-like RNases make up a subclass within an RNase superfamily, which is distinct from the subclass formed by the S-RNases. RNS2 is most similar to RNase LE [Jost, W., Bak, H., Glund, K., Terpstra, P., Beintema, J. J. (1991) Eur. J. Biochem. 198, 1-6.], an S-like RNase from Lycopersicon esculentum, a Solanaceous species. The fact that RNase LE is more similar to RNS2 than to the S-RNases from other Solanaceous plants indicates that the S-like RNases diverged from the S-RNases prior to speciation. Like the S-RNase genes, RNS2 is most highly expressed in flowers, but unlike the S-RNase genes, RNS2 is also expressed in roots, stems, and leaves of Arabidopsis. Moreover, the expression of RNS2 is increased in both leaves and petals of Arabidopsis during senescence. Phosphate starvation can also induce the expression of RNS2. On the basis of these observations, we suggest that one role of RNS2 in Arabidopsis may be to remobilize phosphate, particularly when cells senesce or when phosphate becomes limiting. C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. UNIV WISCONSIN,DEPT BIOCHEM,MADISON,WI 53706. MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824. RI Raines, Ronald/A-5009-2013 OI Raines, Ronald/0000-0001-7164-1719 NR 52 TC 188 Z9 200 U1 2 U2 7 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN 1 PY 1993 VL 90 IS 11 BP 5118 EP 5122 DI 10.1073/pnas.90.11.5118 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF285 UT WOS:A1993LF28500072 PM 8506358 ER PT J AU PAULSEN, MD ORNSTEIN, RL AF PAULSEN, MD ORNSTEIN, RL TI SUBSTRATE MOBILITY IN THIOCAMPHOR-BOUND CYTOCHROME-P450(CAM) - AN EXPLANATION OF THE CONFLICT BETWEEN THE OBSERVED PRODUCT PROFILE AND THE X-RAY STRUCTURE SO PROTEIN ENGINEERING LA English DT Article DE ENZYME SPECIFICITY; MOLECULAR DYNAMICS SIMULATIONS; PROTEIN DYNAMICS; RATIONAL DESIGN ID MOLECULAR-DYNAMICS SIMULATION; CRYSTAL-STRUCTURE; CYTOCHROME-P-450CAM; PROTEIN; HYDROXYLATION; MUTAGENESIS AB Thiocamphor is an unusual substrate for P450cam in that in the X-ray structure it binds in the active site pocket in two distinct orientations and neither of these orientations are consistent with the 5-alcohol being the primary product. Other camphor analogs such as norcamphor or camphane bind in a single orientation consistent with the 5-alcohol being a major product. We present an analysis of four 175 ps molecular dynamics trajectories of thiocamphor-bound cytochrome P450cam. The first two trajectories were calculated for cytochrome P450cam with thiocamphor bound in both its major and minor crystallographic orientations. In the second set of simulations, a single oxygen atom was added as a distal ligand to the heme group in order to model the putative ferryl oxygen reaction intermediate. Trajectories were again calculated starting with thiocamphor in its major and minor orientations. While the protein dynamics were quite similar in atl four trajectories, the substrate showed distinctly different motions in each of the trajectories. In particular, the preferred substrate orientations were very different in the presence of the ferryl oxygen than in the absence of that oxygen. The preferred orientations in the absence of the distal oxygen were consistent with the 3-alcohol being the major product, while the preferred orientations in the presence of the distal oxygen were consistent with the 5-alcohol being a major product. These simulations offer an explanation for the inconsistency between the X-ray data and the product profile. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 38 TC 18 Z9 18 U1 0 U2 2 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0269-2139 J9 PROTEIN ENG JI Protein Eng. PD JUN PY 1993 VL 6 IS 4 BP 359 EP 365 DI 10.1093/protein/6.4.359 PG 7 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA LG328 UT WOS:A1993LG32800003 PM 8332592 ER PT J AU HACKER, BC AF HACKER, BC TI THE LASER IN AMERICA, 1950-1970 - BROMBERG,JL SO PUBLIC HISTORIAN LA English DT Book Review RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0272-3433 J9 PUBL HISTORIAN JI Public Hist. PD SUM PY 1993 VL 15 IS 3 BP 70 EP 72 PG 3 WC History SC History GA LQ704 UT WOS:A1993LQ70400016 ER PT J AU GILLEN, KT CLOUGH, RL AF GILLEN, KT CLOUGH, RL TI PREDICTIVE AGING RESULTS IN RADIATION ENVIRONMENTS SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article ID OXIDATIVE-DEGRADATION; POLYMERS AB We have previously derived a time-temperature-dose rate superposition methodology, which, when applicable, can be used to predict polymer degradation versus dose rate, temperature and exposure time. This methodology results in predictive capabilities at the low dose rates and long time periods appropriate, for instance, to ambient nuclear power plant environments. The methodology was successfully applied to several polymeric cable materials and then verified for two of the materials by comparisons of the model predictions with 12 year, low-dose-rate aging data on these materials from a nuclear environment. In this paper, we provide a more detailed discussion of the methodology and apply it to data obtained on a number of additional nuclear power plant cable insulation (a hypalon, a silicone rubber and two ethylene-tetrafluoroethylenes) and jacket (a hypalon) materials. We then show that the predicted, low-dose-rate results for our materials are in excellent agreement with long-term (7-9 year) low-dose-rate results recently obtained for the same material types actually aged under nuclear power plant conditions. Based on a combination of the modelling and long-term results, we find indications of reasonably similar degradation responses among several different commercial formulations for each of the following ''generic'' materials: hypalon, ethylene-tetrafluoroethylene, silicone rubber and PVC. If such ''generic'' behavior can be further substantiated through modelling and long-term results on additional formulations, predictions of cable life for other commercial materials of the same generic types would be greatly facilitated. RP GILLEN, KT (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 13 Z9 13 U1 3 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-5724 J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD JUN PY 1993 VL 41 IS 6 BP 803 EP 815 DI 10.1016/0969-806X(93)90026-Q PG 13 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA LT854 UT WOS:A1993LT85400003 ER PT J AU SMITH, HV ALLISON, P AF SMITH, HV ALLISON, P TI ELECTRON SUPPRESSION IN THE H- BEAM FROM A PENNING SURFACE-PLASMA SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB The ratio of electrons to negative ions extracted from Penning surface-plasma sources such as the 8X source is low even before any fur-ther steps are taken to suppress the electrons. For the 8X source the e-/H- ratio is typically four or five to one for H- operation and nine to one for D- operation. Because the coextracted e- present a power-loading problem to the 8X-source extraction system, methods to dissipate and/or reduce the power in the e-beam must be developed before extracting a dc H- or D- beam. Thus, we systematically varied the geometry of a cylindrical collar installed in the near-extraction region of the 8X source. The observed dependence of the extracted e- and H- currents on the collar radii and lengths suggests that a conical collar would provide superior electron suppression. The conical collar that we tested lowered the e-/H- ratio to 0.9/1 without reducing the extracted H- current. RP SMITH, HV (reprint author), LOS ALAMOS NATL LAB,AT-10,MAIL STOP H818,LOS ALAMOS,NM 87545, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1993 VL 64 IS 6 BP 1394 EP 1397 DI 10.1063/1.1144049 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LF965 UT WOS:A1993LF96500002 ER PT J AU RESS, D BELL, PM BRADLEY, DK AF RESS, D BELL, PM BRADLEY, DK TI A TIME-RESOLVED X-RAY RING CODED-APERTURE MICROSCOPE FOR INERTIAL CONFINEMENT FUSION APPLICATIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB For energetic x rays (hv greater-than-or-equal-to 3 keV), ring coded-aperture imaging gives better signal-to-noise ratio than equivalent-resolution pinhole cameras for inertial confinement fusion (ICF) targets. We have created a time-resolved ring coded-aperture microscope by combining a 4 X 3 array of annular apertures with a gated microchannel-plate x-ray imager. The new instrument can produce 500-ps duration sequences of images with a temporal resolution of 80 ps and a spatial resolution of 5 to 6 mum. In demonstration experiments, coded images of imploded targets directly driven by the Omega laser at the Laboratory for Laser Energetics showed the formation and dissolution of the target cores with improved detail. Contour plots of the images indicate that the laser illumination pattern is imprinted in the imploded core region. The gated ring-aperture microscope will be useful in detailed studies of ICF target hydrodynamics. C1 LAB LASER ENERGET,ROCHESTER,NY 14623. RP RESS, D (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 7 TC 5 Z9 7 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1993 VL 64 IS 6 BP 1404 EP 1406 DI 10.1063/1.1144051 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LF965 UT WOS:A1993LF96500004 ER PT J AU THOMAS, JC HWANG, DQ HORTON, RD ROGERS, JH RAMAN, R AF THOMAS, JC HWANG, DQ HORTON, RD ROGERS, JH RAMAN, R TI A SIMPLE FAST PULSE GAS VALVE USING A DYNAMIC PRESSURE DIFFERENTIAL AS THE PRIMARY CLOSING MECHANISM SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB In this article we describe a simple fast pulse gas valve developed for use in a plasma discharge experiment. The valve delivers 10(17)-10(19) Molecules per pulse varied by changing the voltage on the electromagnetic driver power supply. Valve pulse widths are observed to be less than 300 ps full width at half maximum with a rise time of less than 100 mus resulting in a maximum gas flow rate of approximately 10(22) Molecules per second. An optical transmission technique was used to determine the mechanical opening and closing characteristics of the valve piston. A fast ionization gauge (FIG) was used for diagnosis of the temporal character of the gas pulse while the total gas throughput was determined by measuring the change in pressure per pulse in a small test chamber with a convectron tube gauge. Calibration of the FIG was accomplished by comparing the net change in pressure in a large chamber as measured by the FIG to the net change in pressure in a small test chamber as measured by the convectron tube gauge. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. CCFM TDEV,VARENNES J3X 1S1,PQ,CANADA. RP THOMAS, JC (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 4 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1993 VL 64 IS 6 BP 1410 EP 1413 DI 10.1063/1.1144053 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LF965 UT WOS:A1993LF96500006 ER PT J AU BAADHIO, RA KAUFFMAN, LH AF BAADHIO, RA KAUFFMAN, LH TI LINK MANIFOLDS AND GLOBAL GRAVITATIONAL ANOMALIES SO REVIEWS IN MATHEMATICAL PHYSICS LA English DT Review AB A new method of constructing exotic 11-dimensional structures, as solutions for the cancellation of global gravitational anomalies, is revealed. The construction makes use of link manifolds. Of relevant interest is the fact that the geometry and topology of the exotic 11-dimensional manifolds are encoded in the classical invariants of knots and links in dimension three. C1 UNIV ILLINOIS,DEPT MATH STAT & COMP SCI,CHICAGO,IL 60680. RP BAADHIO, RA (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 20 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 0129-055X J9 REV MATH PHYS JI Rev. Math. Phys. PD JUN PY 1993 VL 5 IS 2 BP 331 EP 343 DI 10.1142/S0129055X93000085 PG 13 WC Physics, Mathematical SC Physics GA LQ211 UT WOS:A1993LQ21100003 ER PT J AU FREEDMAN, DA GOLD, LS SLONE, TH AF FREEDMAN, DA GOLD, LS SLONE, TH TI HOW TAUTOLOGICAL ARE INTERSPECIES CORRELATIONS OF CARCINOGENIC POTENCIES SO RISK ANALYSIS LA English DT Article DE CARCINOGENIC POTENCY; TD50; INTERSPECIES CORRELATION; ONE-HIT MODEL; ANIMAL CANCER TESTS ID ANIMAL BIOASSAYS; CHRONOLOGICAL SUPPLEMENT; RODENT CARCINOGENS; TOXICITY; DATABASE; CHEMICALS; DEBATE; RATS; MICE; TOO AB Crouch and Wilson demonstrated a strong correlation between carcinogenic potencies in rats and mice, supporting the extrapolation from mouse to man. Bernstein et al., however, show that the observed correlation is mainly a statistical artifact of bioassay design. Crouch et al. have a comeback. This paper will review the arguments and present some new data. The correlation is largely (but not totally) tautological, confirming results in Bernstein et al. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP FREEDMAN, DA (reprint author), UNIV CALIF BERKELEY,DEPT STAT,BERKELEY,CA 94720, USA. NR 34 TC 12 Z9 12 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 JUN PY 1993 VL 13 IS 3 BP 265 EP 272 DI 10.1111/j.1539-6924.1993.tb01078.x PG 8 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA LJ964 UT WOS:A1993LJ96400005 PM 8341805 ER PT J AU WHITE, RK AF WHITE, RK TI LIFE AND DEATH AT WORK - INDUSTRIAL-ACCIDENTS AS A CASE OF SOCIALLY-PRODUCED ERROR - DWYER,T SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 371 EP 372 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 LJ964 UT WOS:A1993LJ96400018 ER PT J AU WHITE, RK AF WHITE, RK TI AIR TOXICS AND RISK ASSESSMENT - CALABRESE,EJ, KENYON,EM SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 371 EP 371 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 LJ964 UT WOS:A1993LJ96400017 ER PT J AU WHITE, RK AF WHITE, RK TI ACCIDENT PREVENTION FOR HOTELS, MOTELS, AND RESTAURANTS - KOHR,RL SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 371 EP 371 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 LJ964 UT WOS:A1993LJ96400016 ER PT J AU WHITE, RK AF WHITE, RK TI LAND-USE CHANGES IN EUROPE - PROCESSES OF CHANGE, ENVIRONMENTAL TRANSFORMATIONS, AND FUTURE PATTERNS - BROUWER,FM, THOMAS,AJ, CHADWICK,MJ SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 372 EP 372 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 LJ964 UT WOS:A1993LJ96400020 ER PT J AU WHITE, RK AF WHITE, RK TI RISK AND SOCIETY - THE INTERACTION OF SCIENCE, TECHNOLOGY AND PUBLIC-POLICY - WATERSTONE,M SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 372 EP 372 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 LJ964 UT WOS:A1993LJ96400019 ER PT J AU WHITE, RK AF WHITE, RK TI ENVIRONMENTAL EPIDEMIOLOGY, VOL 1, PUBLIC-HEALTH AND HAZARDOUS WASTES - NATL-RES COUNCIL-COMMISS-LIFE-SCI-BOARD-ENVIRONM-STUDIES-TOXICOL-COMM-ENVIRONM-EP IDEMIOL SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 2 U2 2 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 373 EP 373 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 LJ964 UT WOS:A1993LJ96400022 ER PT J AU WHITE, RK AF WHITE, RK TI CHILDREN OF THE ATOMIC-BOMB SURVIVORS - A GENETIC-STUDY - NEEL,JV, SCHOLL,WJ SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (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 WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0272-4332 EI 1539-6924 J9 RISK ANAL JI Risk Anal. PD JUN PY 1993 VL 13 IS 3 BP 373 EP 373 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 LJ964 UT WOS:A1993LJ96400021 ER PT J AU TRINGIDES, MC ROOS, KR JESINA, A HAAS, J LEVENBERG, P AF TRINGIDES, MC ROOS, KR JESINA, A HAAS, J LEVENBERG, P TI NONEQUILIBRIUM SURFACE-DIFFUSION MEASUREMENTS IN SYSTEMS WITH INTERACTIONS SO SCANNING MICROSCOPY LA English DT Article DE SURFACE DIFFUSION; GROWTH; NONEQUILIBRIUM PROCESSES; QUANTITATIVE LOW-ENERGY-ELECTRON-DIFFRACTION/REFLECTION-HIGH-ENERGY-ELECTRON-DIFFRACT ION PROFILE ANALYSIS; GROWTH UNDER CONSTANT DEPOSITION RATE; GROWTH PROCESS MODELING ID DEPENDENT DIFFUSION; ENERGY; COVERAGE; COEFFICIENTS; SCATTERING; DYNAMICS; GROWTH; CO AB Diffusion in surface overlayers with adsorbate-adsorbate interactions is described in terms of coverage-dependent diffusion coefficients. The measured phenomenological Arrhenius parameters (activation energy and prefactor) depend on the initial configuration of the system. Since different experimental methods probe the system in different states, the measured diffusion coefficients depend on the method used. Experimental results demonstrating this dependence are presented for O/W(110) - p(2x1) + p(2x2) and Ag/Si(111) - root 3 x root 3 R30 degrees. They were measured during the evolution of the system to attain a new equilibrium state of different symmetry. In addition, simulations on lattice gas models with interactions, modeling other surface diffusion techniques (Laser-Induced-Desorption, fluctuation, non-equilibrium kinetics) support the configuration-dependent results. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP TRINGIDES, MC (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011, USA. NR 25 TC 0 Z9 0 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 JUN PY 1993 VL 7 IS 2 BP 503 EP 511 PG 9 WC Microscopy SC Microscopy GA MP614 UT WOS:A1993MP61400007 ER PT J AU ALLEN, MJ TENCH, RJ MAZRIMAS, JA BALOOCH, M SIEKHAUS, WJ BALHORN, R AF ALLEN, MJ TENCH, RJ MAZRIMAS, JA BALOOCH, M SIEKHAUS, WJ BALHORN, R TI ANALYSIS OF SYNTHETIC DNAS AND DNA-PROTAMINE COMPLEXES WITH THE SCANNING TUNNELING MICROSCOPE SO SCANNING MICROSCOPY LA English DT Article DE SCANNING TUNNELING MICROSCOPY (STM); DNA; PROTAMINE; DNA CONFORMATION; B CONFORMATION; OLIGONUCLEOTIDES ID LANGMUIR-BLODGETT FILMS; TUNNELLING MICROSCOPY; HIGH-RESOLUTION; METHANOSPIRILLUM-HUNGATEI; MOLECULAR-STRUCTURE; SURFACE-TOPOGRAPHY; CONTRAST MECHANISM; ORGANIC-MOLECULES; STRANDED-DNA; X-RAY AB Three duplex DNAs 22, 47, and 100 base-pairs in length have been imaged with the scanning tunneling microscope (STM) after deposition on highly oriented pyrolytic graphite (HOPG). Images of the 47 base-pair (bp) molecules are resolved sufficiently to identify the two phosphodiester strands, the direction of helical coiling (this molecule contains three turns of left-handed helix), and single-stranded ends. Length measurements indicate that all three DNA sequences have adopted an ''A-like'' conformation. DNA-protamine complexes were also prepared and imaged under similar conditions. Length measurements of the complexes demonstrate that the binding of bull protamine 1 to the 47-mer stabilizes the DNA in a B conformation and prevents the B to A transition that has been shown to occur as the DNA molecules dehydrate on the surface. Measurements of the diameter of the complex (3 nm) were also obtained and were found to be only slightly larger than the DNA molecule. This observation is consistent with the binding of the protamine molecule inside one of the grooves. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. NR 75 TC 3 Z9 3 U1 0 U2 3 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 JUN PY 1993 VL 7 IS 2 BP 563 EP 576 PG 14 WC Microscopy SC Microscopy GA MP614 UT WOS:A1993MP61400014 PM 8108673 ER PT J AU SANTELLA, ML AF SANTELLA, ML TI WELD SOLIDIFICATION CRACKING IN CAST NI3AL ALLOYS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP SANTELLA, ML (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 10 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN 1 PY 1993 VL 28 IS 11 BP 1305 EP 1310 DI 10.1016/0956-716X(93)90473-6 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KY826 UT WOS:A1993KY82600001 ER PT J AU BHATTACHARYA, AK HONG, SI AF BHATTACHARYA, AK HONG, SI TI MODELING OF COMPRESSIVE STIFFNESS OF A MULTILAYERED GRAPHITE-REINFORCED MAGNESIUM-MATRIX COMPOSITE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 7 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN 1 PY 1993 VL 28 IS 11 BP 1311 EP 1316 DI 10.1016/0956-716X(93)90474-7 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KY826 UT WOS:A1993KY82600002 ER PT J AU LIENERT, TJ BRANDON, ED LIPPOLD, JC AF LIENERT, TJ BRANDON, ED LIPPOLD, JC TI LASER AND ELECTRON-BEAM WELDING OF SICP REINFORCED ALUMINUM A-356 METAL-MATRIX COMPOSITE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP LIENERT, TJ (reprint author), EDISON WELDING INST,COLUMBUS,OH 43212, USA. NR 13 TC 41 Z9 49 U1 1 U2 12 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 JUN 1 PY 1993 VL 28 IS 11 BP 1341 EP 1346 DI 10.1016/0956-716X(93)90479-C PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KY826 UT WOS:A1993KY82600007 ER PT J AU DAHOTRE, NB MCCAY, MH MCCAY, TD HUBBARD, CR PORTER, WD CAVIN, OB AF DAHOTRE, NB MCCAY, MH MCCAY, TD HUBBARD, CR PORTER, WD CAVIN, OB TI EFFECT OF GRAIN-STRUCTURE ON PHASE-TRANSFORMATION EVENTS IN THE INCONEL-718 SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID SOLIDIFICATION; DIAGRAM C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP DAHOTRE, NB (reprint author), UNIV TENNESSEE,INST SPACE,CTR LASER APPL,TULLAHOMA,TN 37388, USA. NR 13 TC 6 Z9 6 U1 2 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 JUN 1 PY 1993 VL 28 IS 11 BP 1359 EP 1364 DI 10.1016/0956-716X(93)90482-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KY826 UT WOS:A1993KY82600010 ER PT J AU CHEN, SP LESAR, R ROLLETT, AD AF CHEN, SP LESAR, R ROLLETT, AD TI MODELING OF TRANSFORMATION TOUGHENING IN BRITTLE COMPOSITES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-BOUNDARIES; CERAMICS; ZIRCONIA; NI3AL; BORON C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP CHEN, SP (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Rollett, Anthony/A-4096-2012; LeSar, Richard/G-1609-2012 OI Rollett, Anthony/0000-0003-4445-2191; NR 19 TC 1 Z9 1 U1 0 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 JUN 1 PY 1993 VL 28 IS 11 BP 1393 EP 1398 DI 10.1016/0956-716X(93)90488-E PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KY826 UT WOS:A1993KY82600016 ER PT J AU KURTZ, SR BAJAJ, J EDWALL, DD IRVINE, SJC AF KURTZ, SR BAJAJ, J EDWALL, DD IRVINE, SJC TI INFRARED PHOTOLUMINESCENCE CHARACTERIZATION OF LONG-WAVELENGTH HGCDTE DETECTOR MATERIALS SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON MERCURY CADMIUM TELLURIDE CHARACTERIZATION CY OCT 15-16, 1992 CL DANVERS, MA SP NIST ID HG1-XCDXTE; CENTERS AB Using a double-modulation, infrared photoluminescence technique, we have examined a variety of long-wavelength, HgCdTe materials under development for focal-plane array applications. Near-bandgap photoluminescence was easily observed in 'good quality' HgCdTe at 77 K, and we demonstrate the feasibility of using this technique for routine characterization of HgCdTe prior to device processing. Information regarding minority carrier lifetime, compositional uniformity, and native defects is obtained from photoluminescence data. C1 ROCKWELL INT CORP,CTR SCI,THOUSAND OAKS,CA 91360. RP KURTZ, SR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 9 Z9 9 U1 0 U2 2 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 JUN PY 1993 VL 8 IS 6 SU S BP 941 EP 945 DI 10.1088/0268-1242/8/6S/015 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA LL644 UT WOS:A1993LL64400016 ER PT J AU HOU, JG CRESPI, VH XIANG, XD VAREKA, WA BRICENO, G ZETTL, A COHEN, ML AF HOU, JG CRESPI, VH XIANG, XD VAREKA, WA BRICENO, G ZETTL, A COHEN, ML TI DETERMINATION OF SUPERCONDUCTING AND NORMAL-STATE PARAMETERS OF SINGLE-CRYSTAL K3C60 SO SOLID STATE COMMUNICATIONS LA English DT Article ID FIELDS AB We report magnetoresistance measurements on superconducting single crystals of K3C60. An analysis of the experimental data yields superconducting state and normal state parameters, including the upper critical field H(c2)(T), coherence length xi, penetration depth lambda, scattering time tau, mean free path l, and zero temperature resistivity rho(0). Some of the intrinsic single crystal parameters are significantly different from those extracted from thin film and powder specimens. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP HOU, JG (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Hou, Jianguo/G-5076-2010; Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017; OI Zettl, Alex/0000-0001-6330-136X; Crespi, Vincent/0000-0003-3846-3193 NR 20 TC 43 Z9 45 U1 1 U2 4 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 JUN PY 1993 VL 86 IS 10 BP 643 EP 646 DI 10.1016/0038-1098(93)90831-7 PG 4 WC Physics, Condensed Matter SC Physics GA LF923 UT WOS:A1993LF92300006 ER PT J AU ALLAN, FC AF ALLAN, FC TI BENCHMARKING - PRACTICAL ASPECTS FOR INFORMATION PROFESSIONALS SO SPECIAL LIBRARIES LA English DT Article AB Benchmarking is an important activity in helping organizations toward TQM. Applying the technique in the research environment of a national laboratory has some unique aspects. How information resource involvement was prototyped is described. The role of the information specialist is discussed. Using the current benchmarking methodology, information components at each step are identified. Activities involved are outlined: lessons learned and som general guidelines are provided. RP ALLAN, FC (reprint author), SANDIA NATL LABS,DEPT TECH LIB REFERENCE,ALBUQUERQUE,NM 87185, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU SPECIAL LIBRARIES ASSN PI WASHINGTON PA 1700 EIGHTEENTH ST NW, WASHINGTON, DC 20009-2508 SN 0038-6723 J9 SPEC LIBR JI Spec. Libr. PD SUM PY 1993 VL 84 IS 3 BP 123 EP 130 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA LR661 UT WOS:A1993LR66100002 ER PT J AU JOO, J SINGH, JP POEPPEL, RB AF JOO, J SINGH, JP POEPPEL, RB TI EFFECTS OF THERMOMECHANICAL TREATMENT ON PHASE DEVELOPMENT AND PROPERTIES OF AG-SHEATHED BI(PB)-SR-CA-CU-O SUPERCONDUCTING TAPES SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article ID CRITICAL CURRENT-DENSITY; WIRES; 2223-PHASE; FIELD AB The effects of thermomechanical treatment, starting composition, and Ag addition on microstructure and corresponding critical current density (J(c)) of Ag-sheathed Bi1.8Pb0.4Sr2Ca2.2Cu3Ox (BSCCO) superconductor tapes made by a powder-in-tube technique have been studied. It was observed that for sintering in a 10% flowing oxygen atmosphere, 835-840-degrees-C is the optimum processing temperature range for improved J(c). Above this temperature range, although the grain alignment increases, the content of 2223 phase decreases, resulting in a corresponding decrease in J(c). The tapes were subjected to repeated thermomechanical treatment of pressing and sintering. These thermomechanical treatments resulted in increased grain size and alignment, and increased content of 2223 phase, leading to increased J(c). X-ray analysis suggests that the 2212 phase reacts with non-superconducting phases, such as CaCuO2, (SrCa)2CuO3, CaO, and CuO, for form 2223 phase. Furthermore, addition of Ag to a superconducting BSCCO core slightly improved J(c) without adversely affecting the transition temperature of a Ag-sheathed BSCCO tape. C1 IIT,CHICAGO,IL 60616. RP JOO, J (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 25 TC 24 Z9 24 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JUN PY 1993 VL 6 IS 6 BP 421 EP 428 DI 10.1088/0953-2048/6/6/006 PG 8 WC Physics, Applied; Physics, Condensed Matter SC Physics GA LK770 UT WOS:A1993LK77000006 ER PT J AU IBIDUNNI, AO MASAITIS, RL OPILA, RL DAVENPORT, AJ ISAACS, HS TAYLOR, JA AF IBIDUNNI, AO MASAITIS, RL OPILA, RL DAVENPORT, AJ ISAACS, HS TAYLOR, JA TI CHARACTERIZATION OF THE OXIDATION OF TANTALUM NITRIDE SO SURFACE AND INTERFACE ANALYSIS LA English DT Article ID CHEMICAL-SHIFTS; X-RAY; TITANIUM; SPECTRA; FILMS; AUGER AB Sputter-deposited non-stoichiometric tantalum nitride films are used for laser-trimmed thin-film resistors owing to their stability and processability. The films are stabilized by heating in air to form a passive Ta2O5 film. This passive film can be destroyed if the resistors are exposed to aggressive thermal or chemical conditions. Thus we have studied sputtered TaN films and resistors deposited on SiO2 and Al2O3 substrates and exposed to either KOH solutions or air at 250-500-degrees-C for various times. The oxidized films have been characterized with Auger electron spectroscopy (AES), x-ray photelectron spectroscopy (XPS), x-ray absorption near-edge spectroscopy (XANES) and extended x-ray absorption fine structure (EXAFS). Chemical shifts in the NOO Auger spectrum have been used to show that the initial fraction of deposited TaN reacts with the SiO2 surface to form Ta2O5. X-ray photoelectron spectroscopy showed that although significant amounts of oxygen can be present in the sputtered films, little of the tantalum is fully oxidized to Ta2O5. X-ray photoelectron spectroscopy was also used to show that the oxide layer slowly increases in thickness when heated in air. Finally, KTaO3 was identified by XANES on the surface of films exposed to KOH. Once the passive Ta2O5 is converted to KTaO3, further oxidation of the underlying films occurs. The mechanism of oxidation of these films and the unique advantages of each spectroscopic technique are discussed. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. AT&T BELL LABS,ALLENTOWN,PA 18103. RP IBIDUNNI, AO (reprint author), AT&T BELL LABS,1600 OSGOOD ST,N ANDOVER,MA 01845, USA. RI Davenport, Alison/J-6089-2013 OI Davenport, Alison/0000-0003-0853-515X NR 16 TC 12 Z9 12 U1 2 U2 22 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JUN PY 1993 VL 20 IS 7 BP 559 EP 564 DI 10.1002/sia.740200703 PG 6 WC Chemistry, Physical SC Chemistry GA LH972 UT WOS:A1993LH97200002 ER PT J AU VOLKOW, ND FOWLER, JS WANG, GJ HITZEMANN, R LOGAN, J SCHLYER, DJ DEWEY, SL WOLF, AP AF VOLKOW, ND FOWLER, JS WANG, GJ HITZEMANN, R LOGAN, J SCHLYER, DJ DEWEY, SL WOLF, AP TI DECREASED DOPAMINE-D(2) RECEPTOR AVAILABILITY IS ASSOCIATED WITH REDUCED FRONTAL METABOLISM IN COCAINE ABUSERS SO SYNAPSE LA English DT Article DE [F-18]N-METHYLSPIROPERIDOL; 2-DEOXY-2-[F-18]FLUORO-D-GLUCOSE; DRUG DEPENDENCE; BRAIN GLUCOSE METABOLISM; DOPAMINE RECEPTORS ID POSITRON EMISSION TOMOGRAPHY; PROGRESSIVE SUPRANUCLEAR PALSY; CEREBRAL BLOOD-FLOW; PARKINSONS-DISEASE; HUMAN-BRAIN; BASAL GANGLIA; ENDOGENOUS DOPAMINE; GLUCOSE-UTILIZATION; NUCLEUS-ACCUMBENS; BINDING-SITES AB Decreased dopaminergic function has been postulated to underlie cocaine addiction. To examine the possibility that dysfunction of brain regions subserved by the dopamine system could promote cocaine self-administration, positron emission tomography and a dual-tracer approach was used to examine dopamine D2 receptor availability and regional brain-glucose metabolism in cocaine abusers. When compared to normal controls, cocaine abusers showed significant decreases in dopamine D2 receptor availability which persisted 3-4 months after detoxification. Decreases in dopamine D2 receptor availability were associated with decreased metabolism in several regions of the frontal lobes, most markedly orbito-frontal cortex and cingulate gyri. Dopamine dysregulation of these brain areas which are involved in the channeling of drive and affect could lead to loss of control resulting in compulsive drug-taking behavior. C1 BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. SUNY, DEPT PSYCHIAT, STONY BROOK, NY 11794 USA. VET ADM MED CTR, NORTHPORT, NY 11768 USA. RP BROOKHAVEN NATL LAB, DEPT MED, UPTON, NY 11973 USA. FU NIDA NIH HHS [DA 06 891-02]; NINDS NIH HHS [NS 15638] NR 80 TC 525 Z9 536 U1 7 U2 25 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0887-4476 EI 1098-2396 J9 SYNAPSE JI Synapse PD JUN PY 1993 VL 14 IS 2 BP 169 EP 177 DI 10.1002/syn.890140210 PG 9 WC Neurosciences SC Neurosciences & Neurology GA LE224 UT WOS:A1993LE22400009 PM 8101394 ER PT J AU GROTJAHN, DB VOLLHARDT, KPC AF GROTJAHN, DB VOLLHARDT, KPC TI COBALT-MEDIATED [2+2+2] CYCLOADDITION OF ALKYNES TO THE ENAMINE DOUBLE-BOND - A FORMAL TOTAL SYNTHESIS OF GAMMA-LYCORANE SO SYNTHESIS-STUTTGART LA English DT Article ID AMARYLLIDACEAE ALKALOIDS; STEREOSPECIFIC SYNTHESIS; HYDROGEN MIGRATION; HINDERED ROTATION; 2,3-DOUBLE BOND; DIENE COMPLEX; REARRANGEMENTS; CONSTRUCTION; NUCLEUS; ISOMERIZATION AB In the presence of CPCO(CO)2, bis(trimethylsilyl)acetylene reacts with the alkyne and alkene functions of 1-(6-ethynyl-1,3-benzodi-oxol-5-ylcarbonyl)azacyclopent-2-ene (5c) to create CpCo-cyclohexadiene complexes embodying the polycyclic framework of gamma-lycorane. A novel regioselective fluoride-mediated removal of the 2-trimethylsilyl group from these 1,2-bis(trimethylsilyl)-substituted complexes under mild conditions allowed their successful conversion into 1,12b-didehydro-7-oxo-gamma-lycorane (10 steps from 6-bromo-1,3-benzodioxole-5-carboxylic acid in 9.4 % overall yield). Unusual problems associated with the application of palladium catalysts in the construction of 2-functionalized alkynylarenes related to 5c were circumvented. In addition, CpCo(CO)2 catalyzes the isomerization of the double bond of 1-acylazacyclopent-3-enes to the 2-position, but apparently is ineffective in the isomerization of N-(cyclopropylmethylidene)amines to azacyclopent-2-enes. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP GROTJAHN, DB (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 117 TC 53 Z9 54 U1 2 U2 6 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0039-7881 J9 SYNTHESIS-STUTTGART JI Synthesis PD JUN PY 1993 IS 6 BP 579 EP 605 PG 27 WC Chemistry, Organic SC Chemistry GA LG688 UT WOS:A1993LG68800011 ER PT J AU WANG, CH BHATTACHARYYA, MH AF WANG, CH BHATTACHARYYA, MH TI EFFECT OF CADMIUM ON BONE CALCIUM AND CA-45 IN NONPREGNANT MICE ON A CALCIUM-DEFICIENT DIET - EVIDENCE OF DIRECT EFFECT OF CADMIUM ON BONE SO TOXICOLOGY AND APPLIED PHARMACOLOGY LA English DT Article ID NUTRIENT-SUFFICIENT DIET; SKELETAL LESIONS; BINDING PROTEIN; TISSUE-CULTURE; RATS; KIDNEY; RESORPTION C1 ARGONNE NATL LAB,DIV BIOL & MED RES,BLDG 202,ROOM B273,9700 S CASS AVE,ARGONNE,IL 60439. FU NIEHS NIH HHS [ES04816] NR 28 TC 56 Z9 57 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0041-008X J9 TOXICOL APPL PHARM JI Toxicol. Appl. Pharmacol. PD JUN PY 1993 VL 120 IS 2 BP 228 EP 239 DI 10.1006/taap.1993.1107 PG 12 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA LH287 UT WOS:A1993LH28700009 PM 8511792 ER PT J AU EVANS, RW MANNINEN, DL DONG, FB ASCHER, NL FRIST, WH HANSEN, JA KIRKLIN, JK PERKINS, JD PIRSCH, JD SANFILIPPO, FP AF EVANS, RW MANNINEN, DL DONG, FB ASCHER, NL FRIST, WH HANSEN, JA KIRKLIN, JK PERKINS, JD PIRSCH, JD SANFILIPPO, FP TI IMMUNOSUPPRESSIVE THERAPY AS A DETERMINANT OF TRANSPLANTATION OUTCOMES SO TRANSPLANTATION LA English DT Article ID CADAVERIC RENAL-TRANSPLANTATION; AZATHIOPRINE-ANTILYMPHOCYTE GLOBULIN; CYCLOSPORIN-A; PROPHYLACTIC USE; ORGAN-TRANSPLANTATION; ALLOGRAFT RECIPIENTS; PRACTICE POLICIES; KIDNEY-TRANSPLANTATION; MONOCLONAL-ANTIBODIES; HEART-TRANSPLANTATION AB Although surgical proficiency is essential to the immediate outcome of transplantation, long-term success depends upon how adequately the transplantation recipient is managed. Immunosuppression, the most critical aspect of after care, is subject to wide variation. In January 1990, a survey was sent to the directors of all transplant programs in the United States performing one or more kidney, heart, liver, heart-lung, or pancreas transplant in 1988. Detailed data were obtained on both the drugs and methods used for induction and maintenance immunosuppression, as well as the treatment of rejection. Each program director was asked to rank each immunosuppressive approach according to its perceived impact on patient outcomes. Over 85% of all eligible program directors completed the survey. There is no evidence of survey respondent bias. The use of polyclonal and monoclonal agents for induction immunosuppression was favored most by pancreas program directors (72-76%). These agents were least preferred by liver transplant programs (35-37%). About half of kidney, heart, and heart-lung program directors preferred these agents. Triple-drug therapy consisting of CsA, PRED, and AZA was considered the most preferable maintenance protocol for all transplants (i.e., kidney, 89%; heart, 94%; liver, 88%; heart-lung, 86%; pancreas, 96%). Either i.v. steroids or OKT3 were regarded as the preferred approaches for the treatment of acute or resistant rejection. Finally, the acceptability of outpatient treatment of rejection varied by transplant type (i.e., kidney, 9%; heart, 58%; liver, 5%; heart-lung, 29%; pancreas, 8%). Although there are similarities in the ratings of various aspects of immunosuppressive therapy, there are important differences. This information is critical to anticipate the implications of new immunosuppressive agents and to evaluate changes in the use of existing drugs and therapeutic approaches. C1 BATTELLE SEATTLE RES CTR,SEATTLE,WA 98105. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. VANDERBILT UNIV,NASHVILLE,TN 37240. FRED HUTCHINSON CANC RES CTR,SEATTLE,WA 98104. UNIV ALABAMA,BIRMINGHAM,AL 35294. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV WISCONSIN,MADISON,WI 53706. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP EVANS, RW (reprint author), MAYO CLIN & MAYO FDN,DEPT HLTH SCI RES,ROCHESTER,MN 55905, USA. NR 94 TC 23 Z9 23 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0041-1337 J9 TRANSPLANTATION JI Transplantation PD JUN PY 1993 VL 55 IS 6 BP 1297 EP 1305 DI 10.1097/00007890-199306000-00017 PG 9 WC Immunology; Surgery; Transplantation SC Immunology; Surgery; Transplantation GA LK589 UT WOS:A1993LK58900017 PM 8516817 ER PT J AU JOY, DC ZHANG, YS ZHANG, X HASHIMOTO, T BUNN, RD ALLARD, L NOLAN, TA AF JOY, DC ZHANG, YS ZHANG, X HASHIMOTO, T BUNN, RD ALLARD, L NOLAN, TA TI PRACTICAL ASPECTS OF ELECTRON HOLOGRAPHY SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT AB The electron-optical parameters required to generate an electron hologram are discussed. It is shown that the new generation of commercial field emission transmission electron microscopes (FEG TEM) meet the conditions required. Practical details of the procedures to set up and record a hologram are described. The steps necessary to reconstruct the hologram are also discussed and an outline is provided of a program for the Apple Macintosh(TM) personal computer which implements these operations. The integrity and accuracy of the reconstruction program has been tested by means of a detailed simulation of high-resolution holograms starting from dynamical multi-slice calculations of the exit wavefront. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. HITACHI LTD,DIV INSTRUMENTS,IBARAKI 312,JAPAN. RP JOY, DC (reprint author), UNIV TENNESSEE,EM FACIL,KNOXVILLE,TN 37996, USA. NR 16 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 1 EP 14 DI 10.1016/0304-3991(93)90130-P PG 14 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100002 ER PT J AU ZHANG, X JOY, DC ZHANG, Y HASHIMOTO, T ALLARD, L NOLAN, TA AF ZHANG, X JOY, DC ZHANG, Y HASHIMOTO, T ALLARD, L NOLAN, TA TI ELECTRON HOLOGRAPHY TECHNIQUES FOR STUDY OF FERROELECTRIC DOMAIN-WALLS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT AB An electron holographic method is introduced for the study of ferroelectric domain walls. The method allows not only direct imaging of the domain wall but also the measurement of local spontaneous polarization. Preliminary results of first high-resolution imaging of ferroelectric domain walls by using this technique in BaTiO3 and quantitative measurements of electrostatic field distribution across domain walls are presented. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. HITACHI LTD,DIV INSTRUMENT,IBARAKI 312,JAPAN. RP ZHANG, X (reprint author), UNIV TENNESSEE,ELECTRON MICROSCOPE FACIL,KNOXVILLE,TN 37996, USA. NR 14 TC 21 Z9 22 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 21 EP 30 DI 10.1016/0304-3991(93)90132-H PG 10 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100004 ER PT J AU WANG, ZL BENTLEY, J AF WANG, ZL BENTLEY, J TI IN-SITU DYNAMIC PROCESSES ON CLEAVED ALPHA-ALUMINA BULK CRYSTAL-SURFACES IMAGED BY REFLECTION ELECTRON-MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT ID 111 SILICON SURFACES; SAPPHIRE ALPHA-AL2O3; ATOMIC TERMINATIONS; SPECTROSCOPY; FACETS; REM AB Reflection electron microscopy (REM) has been applied to image the dynamic changes of atomic-height steps on the surfaces of alpha-alumina bulk crystals heated in situ to high temperatures. Surface diffusion and sublimation on cleaved alpha-alumina (012) surfaces were observed. The temperature range above which the surface started to show visible structural changes was found to be 1470-1520 K. It is suggested that a vacancy-type terrace is most easily nucleated at a defect site. The primary surface processes are sublimation and diffusion at step ledges, resulting in layer-by-layer desorption of surface atoms. The possible mechanism for exciting surface desorption is the decomposition of Al2O3 into O and AlO gas phases at high temperature. It has been found that similar surface structures are formed by annealing alumina (012) in vacuum or in air. Therefore, the alumina surface processes observed in situ in a conventional transmission electron microscope do reveal the actual surface reconstruction processes during annealing in air. 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 29 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 64 EP 80 DI 10.1016/0304-3991(93)90136-L PG 17 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100008 ER PT J AU KING, WE CAMPBELL, GH AF KING, WE CAMPBELL, GH TI DETERMINATION OF THICKNESS AND DEFOCUS BY QUANTITATIVE COMPARISON OF EXPERIMENTAL AND SIMULATED HIGH-RESOLUTION IMAGES SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT AB In this work, we present a refinement of the thickness, defocus, and beam tilt deduced from a defocus series of high-resolution electron microscope images using a computational method that is commonly employed in structure refinement by X-ray diffraction and in the analysis of gamma-ray and X-ray spectra, namely unconstrained, non-linear, least-squares optimization. Defocus results obtained from the refinement are compared with analysis of the image contrast from amorphous material present in each image. Results indicate that refined values for defocus are consistent with those values determined using more conventional methods. The refinement method is more sensitive to defocus than the conventional method. In addition, the refinement method is sensitive to specimen thickness and beam tilt. Reasonable fits including thickness, defocus, and beam tilt are obtained for defoci near zero defocus, whereas the quality of the fit decreases with increasing defocus. RP KING, WE (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Campbell, Geoffrey/F-7681-2010 NR 10 TC 26 Z9 26 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 128 EP 135 DI 10.1016/0304-3991(93)90141-J PG 8 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100013 ER PT J AU MICHAEL, JR PLIMPTON, SJ ROMIG, AD AF MICHAEL, JR PLIMPTON, SJ ROMIG, AD TI PARALLEL SIMULATION OF ELECTRON-SOLID INTERACTIONS - A RAPID AID FOR ELECTRON-MICROSCOPE DATA INTERPRETATION SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT AB Monte Carlo electron trajectory simulations have been adapted to run on a parallel supercomputer. The increased speed achieved by parallelization of the Monte Carlo code results in the ability to model small probability events easily. The techniques for parallelization of the algorithm are presented here along with examples of applications. The applications include the calculation of the X-ray spatial resolution in thin films, backscattered electron imaging of voids in Al metallizations and X-ray production in thin-film specimens. RP MICHAEL, JR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 160 EP 167 DI 10.1016/0304-3991(93)90144-M PG 8 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100016 ER PT J AU CARIM, AH MITCHELL, TE AF CARIM, AH MITCHELL, TE TI 90-DEGREES BOUNDARIES AND ASSOCIATED INTERFACIAL AND STAND-OFF PARTIAL DISLOCATIONS IN YBA2CU3O7-X SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT ID FILM THICKNESS; THIN-FILMS; LASER; DEPENDENCE; DEPOSITION; SRTIO3; GROWTH AB The 90-degrees rotation boundaries that occur widely in YBa2Cu3O7-x and related oxide superconductors, and which are responsible for the c-perpendicular-to to c-parallel-to transition in thin films, have been studied by high-resolution transmission electron microscopy. Comparison of image simulations to experimental micrographs allows selection between several models for the atomic structure at the interface. Interfacial misfit dislocations with a Burgers vector of 1/3[001] have been observed. Many of these partial dislocations move to stand-off positions in the interfacial grain with c aligned along the boundary, leaving behind a connecting stacking fault. The detachment of the dislocations from the interface appears to be driven by chemical non-stoichiometry rather than by mechanical image forces. The epitaxial alignment of Y2O3 particles within the film and the presence of a stacking fault connecting one such Y2O3 inclusion with a 90-degrees rotation boundary are also discussed. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP CARIM, AH (reprint author), PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIV PK,PA 16802, USA. NR 22 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 228 EP 238 DI 10.1016/0304-3991(93)90149-R PG 11 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100021 ER PT J AU CAMPBELL, GH WIEN, WL KING, WE FOILES, SM RUHLE, M AF CAMPBELL, GH WIEN, WL KING, WE FOILES, SM RUHLE, M TI HIGH-RESOLUTION ELECTRON-MICROSCOPY INVESTIGATION OF THE (710) TWIN IN NB SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT ID EMBEDDED-ATOM METHOD; GRAIN-BOUNDARY; METALS; MOLYBDENUM; SIMULATIONS; CRYSTALS; DEFECTS; MODEL; GOLD; HREM AB High-resolution transmission electron microscopy has been used to evaluate theoretical predictions of the atomic structure of a symmetric 16.3-degrees tilt grain boundary with [001] tilt axes which forms a twin about (710) in Nb, a body-centered cubic metal. The boundary has been fabricated by diffusion-bonding single crystals with flat, polished (710) surfaces misoriented by a 180-degrees rotation in ultrahigh vacuum. High-resolution electron microscopy has been performed on the interface along the common [001] direction. Images were recorded at four defocus conditions which gave strong contrast of the crossed {110} fringes in the bulk crystal on either side of the boundary, Models of the grain boundary atomic structure were predicted using interatomic potentials derived using the embedded atom method (EAM) and the model generalized pseudopotential theory (MGPT). The EAM predicts a multiplicity of structures differing by relative translations of the adjacent crystals, while the MGPT predicts only one mirror-symmetric grain-boundary structure. The theoretically predicted structures have been compared with the high-resolution images through image simulation. The identification of focus conditions has been aided by Fourier analysis of the amorphous edge of the specimen and comparison with calculated contrast transfer functions. The boundary was experimentally observed to have mirror symmetry to within relative crystal translations of +/-0.02 nm as viewed along the tilt axis, hence most of the structures predicted by the EAM can be ruled out. The angular-dependent interactions modeled in the MGPT thus appear to be important in determining the grain-boundary structure of niobium. But unambiguous structure determination is presently limited by the means available to compare simulated with experimental images, the limited resolution of the microscope, imperfect bicrystal orientation, and the inability to distinguish atom positions in the direction parallel to the electron beam in very thin specimens. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,W-7000 STUTTGART 80,GERMANY. RP CAMPBELL, GH (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Campbell, Geoffrey/F-7681-2010; OI Foiles, Stephen/0000-0002-1907-454X NR 40 TC 14 Z9 14 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 247 EP 263 DI 10.1016/0304-3991(93)90151-M PG 17 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100023 ER PT J AU ZHANG, B KRISHNAN, KM FARROW, RFC AF ZHANG, B KRISHNAN, KM FARROW, RFC TI CRYSTALLOGRAPHY OF CO/PT MULTILAYERS AND NANOSTRUCTURES SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 4TH CONF ON FRONTIERS OF ELECTRON MICROSCOPY IN MATERIALS SCIENCE CY APR 21-24, 1992 CL OAKLAND, CA SP LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI DEPT, ARGONNE NATL LAB, ELECTRON MICROSCOPY CTR, ARGONNE NATL LAB, MAT SCI DIV, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UOP RES CTR, OAK RIDGE NATL LAB, HIGHT TEMP MAT LAB, LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, TMS AIME, NO CALIF SECT, TMS AIME, CHICAGO SECT ID SUPERLATTICES; GROWTH AB Atomically engineered nanostructures and multilayers of Co/Pt exhibit strong perpendicular anisotropY. This unique property, that determines their potential as a magneto-optic recording medium, is dependent on a variety of microstructural parameters that include the overall crystallography, thickness of the layers, orientation, defect formation, interface reactions, etc. A series of Co/Pt multilayer samples with different thickness of the Co layer were studied by electron diffraction. It has been determined that the Co layers persist in the fcc structure up to 50 angstrom thickness. As the thickness is varied from 3 to 50 angstrom in the multilayers, the Co film gradually relaxes to its bulk lattice parameter. (111) twinning and lattice strain at the interfaces between Pt and Co layers are also observed. The symmetry-forbidden reflections observed at -1/3{224} positions in [111] zone diffraction patterns of the multilayer are due to (111) twinning and compositional modulations along the multilayer growth direction. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP ZHANG, B (reprint author), LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 7 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP 298 EP 305 DI 10.1016/0304-3991(93)90155-Q PG 8 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100027 ER PT J AU BRADLEY, SA KING, WE AF BRADLEY, SA KING, WE TI FRONTIERS OF ELECTRON-MICROSCOPY IN MATERIALS SCIENCE - PROCEEDINGS OF THE 4TH CONFERENCE ON FRONTIERS OF ELECTRON-MICROSCOPY IN MATERIALS SCIENCE OAKLAND, CA, USA, 21-24 APRIL 1992 - FOREWORD SO ULTRAMICROSCOPY LA English DT Editorial Material C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BRADLEY, SA (reprint author), VOP,RES CTR,DES PLAINES,IL, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1993 VL 51 IS 1-4 BP R7 EP R7 PG 1 WC Microscopy SC Microscopy GA LN791 UT WOS:A1993LN79100001 ER PT J AU SAROJA, KR OESTERLING, JE HENDRICKSON, F COHEN, L MANSELL, J AF SAROJA, KR OESTERLING, JE HENDRICKSON, F COHEN, L MANSELL, J TI PROGNOSTIC IMPLICATIONS OF PROSTATE-SPECIFIC ANTIGEN IN PATIENTS WITH LOCALLY ADVANCED PROSTATE-CANCER TREATED WITH HIGH-ENERGY NEUTRON BEAM THERAPY - PRELIMINARY-RESULTS SO UROLOGY LA English DT Article ID RADICAL PROSTATECTOMY; RADIATION-THERAPY; TUMOR-MARKER; ADENOCARCINOMA; RADIOTHERAPY; CARCINOMA; PROGRESSION; DIAGNOSIS; INDICATOR AB Serial serum prostate-specific antigen (PSA) levels were analyzed retrospectively for prognostic implications in 70 patients with locoregional (Stages B2, C, and Dl) prostate cancer who were managed with high energy neutron beam therapy. Three groups of patients were identified. Group I included 30 patients whose serum PSA level decreased to the reference range (0-4 ng/mL) following neutron therapy and remained so subsequently: 28 (93 %) remained disease-free and 2 (7 %) have failed distantly. All 30 patients (100 %) had no evidence of locally progressive disease. This group was categorized as having a good prognosis. The mean time for serum PSA value to decline to reference range was six months; calculated mean time to achieve a stable baseline PSA was 53 +/- 3 7 days. Follow -up period ranged from twelve to fifty-six months (median: 21 months). Group II consisted of 13 patients in whom there was an initial decrease in serum PSA to reference range followed by a subsequent increase: 6 of 13 (46 %) have no overt clinical progression of disease; 7 (54 %) have either persistent locoregional or distant metastatic disease. Follow-up period was from twelve to seventy-two months (median: 39 months). Calculated mean time to achieve stable baseline PSA for serum PSA in this group was 61 +/- 21 days. Group III patients had a persistently elevated or rising serum PSA concentration. Of 27 patients in this group, only 9 (33 %) have no evidence of disease progression, while 18 patients (67 %) have failed already, either locoregionally or distantly. Follow-up period ranged from twelve to sixty-nine months (median: 21 months). Mean time to achieve stable baseline of serum PSA in this cohort of patients with a poor prognosis was 108 +/- 76 days. We conclude that PSA has a predictable prognostic value in patients with locally advanced prostate cancer managed with high energy neutron beam therapy. Rapid normalization of PSA after therapy indicates a good prognosis. Persistent elevation signifies either presence of persistent locoregional disease or development of distant metastases. Subsequent elevation of the serum PSA concentration after definitive therapy signals progression of prostate cancer. C1 RUSH PRESBYTERIAN ST LUKES MED CTR,CHICAGO,IL 60612. MAYO CLIN & MAYO FDN,DEPT UROL,ROCHESTER,MN 55905. RP SAROJA, KR (reprint author), FERMILAB NATL ACCELERATOR LAB,MIDWEST INST NEUTRON THERAPY,NEUTRON THERAPY FACIL,POB 5004,MS-301,BATAVIA,IL 60510, USA. FU NCI NIH HHS [CA 18081] NR 25 TC 2 Z9 2 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD JUN PY 1993 VL 41 IS 6 BP 540 EP 547 DI 10.1016/0090-4295(93)90101-F PG 8 WC Urology & Nephrology SC Urology & Nephrology GA LL208 UT WOS:A1993LL20800008 PM 7685957 ER PT J AU SCHUPP, EW AF SCHUPP, EW TI QUANTITY, QUALITY AND THE EFFECTIVENESS OF SEED DISPERSAL BY ANIMALS SO VEGETATIO LA English DT Article DE CONSEQUENCES OF SEED DISPERSAL; PLANT FITNESS; SEED DISPERSAL EFFECTIVENESS; SEED DISPERSAL QUALITY; SEED DISPERSAL QUANTITY; SEED DISPERSER ID FRUIT-EATING BIRDS; VIROLA-SURINAMENSIS; FRUGIVOROUS BIRDS; TREEFALL GAPS; MEDITERRANEAN SCRUBLAND; SPATIAL HETEROGENEITY; FOREST UNDERSTORY; AVIAN FRUGIVORES; POLLEN DISPERSAL; GUSTAVIA-SUPERBA AB Disperser effectiveness is the contribution a disperser makes to the future reproduction of a plant. Although it is a key notion in studies of seed dispersal by animals, we know little about what determines the effectiveness of a disperser. The role of the present paper is to review the available information and construct a hierarchical framework for viewing the components of disperser effectiveness. Effectiveness has both quantitative and qualitative components. The quantity of seed dispersal depends on (A) the number of visits made to the plant by a disperser and (B) the number of seeds dispersed per visit. The quality of seed dispersal depends on (A) the quality of treatment given a seed in the mouth and in the gut and (B) the quality of seed deposition as determined by the probability that a deposited seed will survive and become an adult. In this paper I review the ways disperser behavior, morphology and physiology can influence these major components of disperser effectiveness, and when data permit present preliminary analyses of relationships among components. C1 SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. UTAH STATE UNIV, CTR ECOL, LOGAN, UT 84322 USA. RI Schupp, Eugene/F-1834-2010 NR 103 TC 274 Z9 293 U1 7 U2 67 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0042-3106 J9 VEGETATIO JI Vegetatio PD JUN PY 1993 VL 108 BP 15 EP 29 PG 15 WC Plant Sciences; Ecology; Forestry SC Plant Sciences; Environmental Sciences & Ecology; Forestry GA LR397 UT WOS:A1993LR39700004 ER PT J AU LEHMAN, RF AF LEHMAN, RF TI ARMS-CONTROL - PASSING THE TORCH AS TIME RUNS OUT SO WASHINGTON QUARTERLY LA English DT Article RP LEHMAN, RF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 2 Z9 2 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 SUM PY 1993 VL 16 IS 3 BP 37 EP 52 PG 16 WC International Relations; Law SC International Relations; Government & Law GA LF576 UT WOS:A1993LF57600003 ER PT J AU GARRITY, PJ AF GARRITY, PJ TI IMPLICATIONS OF THE PERSIAN-GULF-WAR FOR REGIONAL POWERS SO WASHINGTON QUARTERLY LA English DT Article RP GARRITY, PJ (reprint author), LOS ALAMOS NATL LAB,CTR NATL SECUR STUDIES,LOS ALAMOS,NM 87544, USA. NR 16 TC 2 Z9 2 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 SUM PY 1993 VL 16 IS 3 BP 153 EP 170 PG 18 WC International Relations; Law SC International Relations; Government & Law GA LF576 UT WOS:A1993LF57600009 ER PT J AU TURNEY, WR THOMSON, BM AF TURNEY, WR THOMSON, BM TI MINERALS AND MINE DRAINAGE SO WATER ENVIRONMENT RESEARCH LA English DT Article ID 3 OHIO WATERSHEDS; MANAGEMENT; IMPACT; METALS; SOILS; USA C1 UNIV NEW MEXICO,DEPT CIVIL ENGN,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 42 TC 1 Z9 1 U1 0 U2 0 PU WATER ENVIRONMENT FEDERATION PI ALEXANDRIA PA 601 WYTHE ST, ALEXANDRIA, VA 22314-1994 SN 1061-4303 J9 WATER ENVIRON RES JI Water Environ. Res. PD JUN PY 1993 VL 65 IS 4 BP 410 EP 413 PG 4 WC Engineering, Environmental; Environmental Sciences; Limnology; Water Resources SC Engineering; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LM722 UT WOS:A1993LM72200023 ER PT J AU BAHADUR, S GONG, D ANDEREGG, JW AF BAHADUR, S GONG, D ANDEREGG, JW TI TRIBOCHEMICAL STUDIES BY XPS ANALYSIS OF TRANSFER FILMS OF NYLON-11 AND ITS COMPOSITES CONTAINING COPPER-COMPOUNDS SO WEAR LA English DT Article ID FILLED POLYTETRAFLUOROETHYLENE; WEAR BEHAVIOR; FRICTION; ESCA AB The transfer films of Nylon 11 and its composites with CuS, CuAc and CuF2 formed on the steel disk surfaces were studied by X-ray photoelectron spectroscopy. The study revealed that CuS and CuF2 decomposed under the rubbing conditions and produced copper, FeF6 group and FeSO4. The analysis at different depths in the transfer films indicated higher concentrations of these species closer to the transfer film-counterface interface. There was no chemical change detected when unfilled Nylon 11 and CuAc-Nylon composite rubbed against the steel disk surfaces. These results have been used to hypothesize the mechanism by which the transfer films of these materials influence wear. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP BAHADUR, S (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT MECH ENGN,AMES,IA 50011, USA. NR 24 TC 26 Z9 30 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD JUN 1 PY 1993 VL 165 IS 2 BP 205 EP 212 DI 10.1016/0043-1648(93)90336-K PG 8 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA LD582 UT WOS:A1993LD58200010 ER PT J AU PAAR, V SUNKO, DK BRANT, S MUSTAFA, MG LANIER, RG AF PAAR, V SUNKO, DK BRANT, S MUSTAFA, MG LANIER, RG TI GAUSSIAN POLYNOMIAL METHOD FOR SPIN-DEPENDENT LEVEL DENSITY AND NEW FORMULA FOR SPIN DISTRIBUTION SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Review ID STATIC-PATH APPROXIMATION; SPECTRAL DISTRIBUTION CALCULATIONS; HIGH-EXCITATION ENERGY; RANDOM MATRIX MODEL; OR-EQUAL-TO; SPACING DISTRIBUTIONS; CUTOFF PARAMETERS; NUCLEI; RESONANCES; PROTON AB Large-scale combinatorial calculations of level densities were performed for selected nuclei using Gaussian polynomial generating function method (GPM). Contrary to the results of previous combinatorial calculations, we find a good agreement of the combinatorial total level densities and Bethe formula. Combinatorial GPM calculations were performed also for spin-dependent level densities and comparison is made with various algebraic formulas. On the basis of our GPM calculations we propose a new phenomenological spin-dependent level density formula, which in the low-spin limit reduces to the spin-dependent formula of Bethe. The new formula (24) is for all spins factorized into the product of total level density and spin distribution function, where the spin distribution function (25) contains an additional spin correction parameter. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PAAR, V (reprint author), UNIV ZAGREB,FAC SCI,DEPT PHYS,POB 162,41000 ZAGREB,CROATIA. RI Paar, Vladimir/D-8009-2015 NR 112 TC 16 Z9 16 U1 1 U2 2 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 JUN PY 1993 VL 345 IS 4 BP 343 EP 357 DI 10.1007/BF01282895 PG 15 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA LK493 UT WOS:A1993LK49300002 ER PT J AU CORCORAN, R MEESON, P PROBST, PA SPRINGFORD, M WOLF, B BLICK, R BRULS, G LUTHI, B FISK, Z SMITH, JL OTT, HR AF CORCORAN, R MEESON, P PROBST, PA SPRINGFORD, M WOLF, B BLICK, R BRULS, G LUTHI, B FISK, Z SMITH, JL OTT, HR TI COMMENT ON THE OBSERVATION OF MAGNETOACOUSTIC QUANTUM OSCILLATIONS IN UBE13 SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Note ID FERMION SUPERCONDUCTOR UBE13 AB The origin of previously reported magnetic quantum oscillations in UBe13 is possibly due to Al inclusions. New measurements of the a.c. susceptibility show Al inclusions which result from the method of crystal growth using aluminium as flux. We discuss the distribution and form of the inclusions and compare our dHvA measurements with those of the gamma-orbits of Al. C1 UNIV FRANKFURT, INST PHYS, W-6000 FRANKFURT, GERMANY. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. SWISS FED INST TECHNOL, FESTKORPERPHYS LAB, CH-8093 ZURICH, SWITZERLAND. RP CORCORAN, R (reprint author), UNIV BRISTOL, HH WILLS PHYS LAB, TYNDALL AVE, BRISTOL BS8 1TL, AVON, ENGLAND. NR 17 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0722-3277 J9 Z PHYS B CON MAT JI Z. Phys. B-Condens. Mat. PD JUN PY 1993 VL 91 IS 2 BP 135 EP 137 DI 10.1007/BF01315226 PG 3 WC Physics, Condensed Matter SC Physics GA LE501 UT WOS:A1993LE50100001 ER PT J AU BAECHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FOKA, P FUCHS, M GAZDZICKI, M GUERRA, C GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M HUMANIC, T KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, Y LEVINE, M LJUBICIC, A MARGETIS, S NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSA, F PUGH, HG PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R RETYK, W ROLAND, G ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHMIDT, E SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TONSE, S VASSILIOU, M VASSILEIADIS, G VESZTERGOMBI, G VRANIC, D WENIG, S AF BAECHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FOKA, P FUCHS, M GAZDZICKI, M GUERRA, C GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M HUMANIC, T KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, Y LEVINE, M LJUBICIC, A MARGETIS, S NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSA, F PUGH, HG PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R RETYK, W ROLAND, G ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHMIDT, E SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TONSE, S VASSILIOU, M VASSILEIADIS, G VESZTERGOMBI, G VRANIC, D WENIG, S TI PRODUCTION OF CHARGED KAONS IN PROTON-NUCLEUS AND NUCLEUS-NUCLEUS COLLISIONS AT 200 GEV/NUCLEON SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; STRANGENESS PRODUCTION; GEV/C AB Production of charged kaons in proton-sulphur, proton-gold, sulphur-sulphur and oxygen-gold collisions at 200 GeV/nucleon has been studied in the NA35 Streamer Chamber experiment. Rapidity and transverse mass distributions as well as mean multiplicities were obtained. The results are compared with nucleon-nucleon data and with model predictions. C1 UNIV ATHENS,DEPT PHYS,GR-15771 ATHENS,GREECE. POLITECN BARI,I-70126 BARI,ITALY. INST NUCL PHYS,PL-30055 KRAKOW,POLAND. GESELL SCHWERIONENFORSCH MBH,W-6100 DARMSTADT,GERMANY. MAX PLANCK INST PHYS & ASTROPHYS,W-8000 MUNICH 40,GERMANY. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. RUDJER BOSKOVIC INST,ZAGREB,CROATIA. INFN,BARI,ITALY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV FRANKFURT,W-6000 FRANKFURT,GERMANY. UNIV MARBURG,W-3550 MARBURG,GERMANY. UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BAECHLER, J (reprint author), UNIV FREIBURG,FAK PHYS,W-7800 FREIBURG,GERMANY. NR 15 TC 13 Z9 13 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1993 VL 58 IS 3 BP 367 EP 375 PG 9 WC Physics, Particles & Fields SC Physics GA LH385 UT WOS:A1993LH38500002 ER PT J AU BANDYOPADHYAY, D GORENSTEIN, M STOCKER, H GREINER, W SORGE, H AF BANDYOPADHYAY, D GORENSTEIN, M STOCKER, H GREINER, W SORGE, H TI PION CHEMICAL-POTENTIALS IN HEAVY-ION COLLISIONS - RELATIVISTIC QUANTUM MOLECULAR DYNAMIC ANALYSIS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article AB In the framework of relativistic quantum molecular dynamics we analyse pion chemical potentials in the hadron system produced in central heavy-ion collisions at the bombarding energies E(lab)/A=(1-2)GeV/nucl. We find that the equilibrium relations hold for chemical potentials of pi-, pi0, pi+ and pion energy spectra reach local thermal equilibrium. However, there is no chemical equilibrium. The pion chemical potentials are very large and decrease during the expansion stage. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. KIEV THEORET PHYS INST,KIEV 252130,UKRAINE. RP BANDYOPADHYAY, D (reprint author), UNIV FRANKFURT,INST THEORET PHYS,POSTFACH 111932,W-6000 FRANKFURT 11,GERMANY. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 13 TC 12 Z9 12 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1993 VL 58 IS 3 BP 461 EP 464 DI 10.1007/BF01557704 PG 4 WC Physics, Particles & Fields SC Physics GA LH385 UT WOS:A1993LH38500012 ER PT J AU SCHNEIDER, RP LOTT, JA AF SCHNEIDER, RP LOTT, JA TI INALP/INALGAP DISTRIBUTED BRAGG REFLECTORS FOR VISIBLE VERTICAL-CAVITY SURFACE-EMITTING LASERS SO APPLIED PHYSICS LETTERS LA English DT Article ID ALLOYS; GAAS AB Distributed Bragg reflectors (DBRs) composed of In0.5Al0.5P/In0.5(AlyGa1-y)0.5P quarter-wave layers have been prepared using metalorganic vapor phase epitaxy. The structures were grown over a wide range of high-index layer composition (0 less-than-or-equal-to y less-than-or-equal-to 0.6) and peak reflectivity wavelength (720 nm less-than-or-equal lambda less-than-or-equal-to 565 nm, covering the spectrum from deep red to green). In all cases observed and calculated reflectance spectra were in excellent agreement. Using these DBRs, an undoped all-phosphide visible vertical cavity surface-emitting laser structure was grown. Under pulsed optical excitation at room temperature, lasing was obtained at a wavelength of lambda is similar to 670 nm, with a threshold power density comparable to that observed from similar structures prepared using AlAs/AlGaAs DBRs. RP SCHNEIDER, RP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 18 Z9 19 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 31 PY 1993 VL 62 IS 22 BP 2748 EP 2750 DI 10.1063/1.109249 PG 3 WC Physics, Applied SC Physics GA LE353 UT WOS:A1993LE35300002 ER PT J AU WERNER, P ZAKHAROV, ND CHEN, Y LILIENTALWEBER, Z WASHBURN, J KLEM, JF TSAO, JY AF WERNER, P ZAKHAROV, ND CHEN, Y LILIENTALWEBER, Z WASHBURN, J KLEM, JF TSAO, JY TI STRESS RELEASING MECHANISMS IN IN0.2GA0.8AS LAYERS GROWN ON MISORIENTED GAAS [001] SUBSTRATE SO APPLIED PHYSICS LETTERS LA English DT Article ID DISLOCATIONS; KINETICS; STRAIN AB The influence of substrate misorientation on the structure and morphology of In0.2Ga0.8As layers grown by molecular beam epitaxy on vicinal, near (001 ), GaAs substrates was investigated by transmission electron microscopy. The substrates were tilted at angles between 0-degrees and 10-degrees in [100], [110], and [120] directions. In layers which exceeded the critical thickness, networks of 60-degrees dislocations running along the intersections of the four {111} planes with the interface were observed. Growth uniformity and anisotropy of strain relaxation were shown to depend on the type of growth steps introduced by a particular tilting direction. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP WERNER, P (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 8 TC 25 Z9 26 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 31 PY 1993 VL 62 IS 22 BP 2798 EP 2800 DI 10.1063/1.109213 PG 3 WC Physics, Applied SC Physics GA LE353 UT WOS:A1993LE35300019 ER PT J AU SHARP, JW ERES, G AF SHARP, JW ERES, G TI KINETICS OF HYDROGEN DESORPTION IN SURFACE-LIMITED THIN-FILM GROWTH OF SIGE ALLOYS SO APPLIED PHYSICS LETTERS LA English DT Article ID MONOHYDRIDE PHASE; CHEMISORPTION; SI(100)2X1; HYDRIDES; GE AB The kinetics of hydrogen desorption in surface-limited thin-film growth of SiGe alloys from binary mixtures of disilane and digermane was investigated by surface differential reflectance. The hydrogen desorption process from the alloy surface was found to consist of two components. Both components are thermally activated, but the activation energies appear to equal neither the hydrogen desorption energy from pure silicon nor that from pure.germanium surfaces. We suggest that the two components represent Ge- and Si-mediated hydrogen desorption, with the former being more rapid than the latter. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SHARP, JW (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Eres, Gyula/C-4656-2017 OI Eres, Gyula/0000-0003-2690-5214 NR 20 TC 12 Z9 12 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 MAY 31 PY 1993 VL 62 IS 22 BP 2807 EP 2809 DI 10.1063/1.109216 PG 3 WC Physics, Applied SC Physics GA LE353 UT WOS:A1993LE35300022 ER PT J AU LYO, SK SIMMONS, JA AF LYO, SK SIMMONS, JA TI LINEAR-RESPONSE THEORY OF INTER-QUANTUM-WELL TUNNELING IN A DOUBLE-WELL STRUCTURE WITH INPLANE MAGNETIC-FIELDS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Letter AB A linear response theory of incoherent tunnelling is presented and compared to data for the 2D-2D inter-quantum-well conductance for a double-well structure with an external in-plane magnetic field. The tunnelling conductance, calculated by evaluating the current-current correlation function, shows resonances as a function of the magnetic field. The widths and heights of the resonance peaks depend sensitively on the intra-well scattering times and temperature. Tunnelling occurs not only through the ground-energy sublevels but also through the higher-energy sublevels which can be important at high temperatures. Using a differential transmission-line model, analytic relationships between the source-drain conductance and the tunnelling conductance are derived. The theoretical results yield reasonable agreement with the tunnelling conductance data obtained from this relationship. RP LYO, SK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 25 Z9 25 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAY 31 PY 1993 VL 5 IS 22 BP L299 EP L306 DI 10.1088/0953-8984/5/22/001 PG 8 WC Physics, Condensed Matter SC Physics GA LF449 UT WOS:A1993LF44900001 ER PT J AU BAKTASH, C WINCHELL, DF GARRETT, JD SMITH, A AF BAKTASH, C WINCHELL, DF GARRETT, JD SMITH, A TI LOW-SPIN IDENTICAL BANDS IN NEIGHBORING ODD-A AND EVEN-EVEN NUCLEI SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID SUPERDEFORMED BANDS; TRANSITION ENERGIES; ALIGNMENT AB A comprehensive study of odd-A rotational bands in normally deformed rare-earth nuclei indicates that a large number of seniority-one configurations (21% for odd-Z nuclei) at low spin have moments of inertia nearly identical to that of the seniority-zero configuration of the neighboring even-even nucleus with one less nucleon. It is difficult to reconcile these results with conventional models of nuclear pair correlation, which predict variations of about 15% in the moments of inertia of configurations differing by one unit in seniority. RP BAKTASH, C (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 17 TC 24 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C145 EP C156 PG 12 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300013 ER PT J AU BROCKSTEDT, A LYTTKENSLINDEN, J BERGSTROM, M EKSTROM, LP RYDE, H BACELAR, JC FRAUENDORF, S GARRETT, JD HAGEMANN, GB HERSKIND, B MAY, FR TJOM, PO AF BROCKSTEDT, A LYTTKENSLINDEN, J BERGSTROM, M EKSTROM, LP RYDE, H BACELAR, JC FRAUENDORF, S GARRETT, JD HAGEMANN, GB HERSKIND, B MAY, FR TJOM, PO TI INTERPRETATION OF BANDS IN ER-163 WITHIN THE TILTED ROTATION SCHEME SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID SPIN AB High-spin data are presented for levels in Er-163 and their structure is interpreted within the tilted rotation scheme. C1 FORSCHUNGSZENTRUM ROSSENDORF,DRESDEN,GERMANY. UNIV GRONINGEN,9700 AB GRONINGEN,NETHERLANDS. UNIV COPENHAGEN,NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. UNIV OSLO,DEPT PHYS,OSLO 3,NORWAY. RP BROCKSTEDT, A (reprint author), LUND UNIV,INST PHYS,S-22101 LUND,SWEDEN. NR 9 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C469 EP C476 PG 8 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300039 ER PT J AU CARPENTER, MP JANSSENS, RVF LIANG, Y BEARDEN, IG AHMAD, I DRIGERT, MW GARG, U HENRY, RG LEWIS, JM KHOO, TL LAURITSEN, T PILOTTE, S REVIOL, W RIEDINGER, LL SORAMEL, F YU, CH AF CARPENTER, MP JANSSENS, RVF LIANG, Y BEARDEN, IG AHMAD, I DRIGERT, MW GARG, U HENRY, RG LEWIS, JM KHOO, TL LAURITSEN, T PILOTTE, S REVIOL, W RIEDINGER, LL SORAMEL, F YU, CH TI NEW RESULTS ON SUPERDEFORMED BANDS IN HG AND TL NUCLEI SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID INERTIA; HG-191 AB New results have been obtained on superdeformed states in 190Hg, 191TI and 192Tl. For 190Hg, the previously identified superdeformed band has been extended up to a rotational frequency of homegaBAR greater-than-or-equal-to 0.40 MeV by combining data from several different experiments. The extracted dynamical moment of inertia J(2) vs homegaBAR exhibits a distinct change in slope at homegaBAR = 0.32 MeV. For 191Tl and 192Tl, two and six superdeformed bands have been identified in these nuclei, respectively. Six of these eight bands exhibit a smooth rise in J(2) with homegaBAR characteristic of the other superdeformed bands identified in this mass region while the remaining two bands which are in 192TI show a constant J(2) with homegaBAR. This new result can be understood in terms of Pauli blocking of quasiparticle alignments in high-N intruder orbitals. The new result for 190Hg is interpreted as evidence of a band interaction at the highest frequencies due to the rotational alignment of a pair of quasiparticles into these same intruder orbitals. These two new features taken together represent the first conclusive evidence that the alignment of intruders is responsible for the smooth rise in J(2) seen in the other superdeformed bands of this mass region. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. EG&G INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. UNIV OTTAWA,DEPT PHYS,OTTAWA K1N 6N5,ONTARIO,CANADA. RP CARPENTER, MP (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, 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 22 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C57 EP C66 PG 10 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300006 ER PT J AU CASTEN, RF AF CASTEN, RF TI RADIOACTIVE NUCLEAR BEAMS AND THE NORTH-AMERICAN ISOSPIN LABORATORY (ISL) INITIATIVE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID TRANSITION AB Radioactive nuclear beams (RNBs) offer exciting new research opportunities in fields as diverse as nuclear structure, nuclear reactions, astrophysics, atomic, materials, and applied science. Their realization in new accelerator complexes also offers important technical challenges. Some of the nuclear physics possibilities afforded by RNBs, with emphasis on low spin nuclear structure, are discussed, accompanied by an outline of the ISL initiative and its status. RP CASTEN, RF (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C675 EP C690 PG 16 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300055 ER PT J AU DELEPLANQUE, MA AF DELEPLANQUE, MA TI SOME NEW ASPECTS OF NUCLEAR-STRUCTURE AT HIGH SPINS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID SUPERDEFORMED BAND; COLLECTIVE BANDS; ROTATIONAL BANDS; SHAPE ISOMERISM; EXCITATIONS; PB-196; STATES AB This paper will focus on the properties of lead and some neighboring nuclei at high spins where they have exotic shapes, such as superdeformed (SD) and oblate. The limits of the region of superdeformation around mass 190 will be explored. On the heavy side, the lead nuclei form the high-Z limit. On the light side, a new SD band has been observed in 191Au, the first one in a gold nucleus, extending the low-Z limit. Collective oblate bands, not often found in the nuclear chart, have recently been observed in a number of lead nuclei (and also in Tl and Hg nuclei) at high spins. They are favored because the Fermi level is located near the oblate-driving high-K h9/2 and i13/2 proton orbitals. Their properties will be examined. A summary of what we hope to learn in the near future will conclude this paper. RP DELEPLANQUE, MA (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 38 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C39 EP C56 PG 18 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300005 ER PT J AU FLOCARD, H CHEN, BQ GALL, B BONCHE, P DOBACZEWSKI, J HEENEN, PH WEISS, MS AF FLOCARD, H CHEN, BQ GALL, B BONCHE, P DOBACZEWSKI, J HEENEN, PH WEISS, MS TI HARTREE-FOCK AND HARTREE-FOCK-BOGOLIUBOV CALCULATIONS OF SUPERDEFORMED BANDS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID SHAPE ISOMERISM; SELF-CONSISTENT; DEFORMATION; HG-194; PB-194; A=190 C1 CALTECH,WK KELLOG RADIAT LAB,PASADENA,CA 91125. CENS,SPHT,F-91191 GIF SUR YVETTE,FRANCE. WARSAW UNIV,INST THEORET PHYS,PL-00681 WARSAW,POLAND. ULB,SERV PHYS NUCL THEOR,B-1050 BRUSSELS,BELGIUM. LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. UNIV PARIS 06,IPN,DIV PHYS THEOR,CNRS,UNITE RECH,F-91406 ORSAY,FRANCE. RP FLOCARD, H (reprint author), UNIV PARIS 11,IPN,DIV PHYS THEOR,CNRS,UNITE RECH,F-91406 ORSAY,FRANCE. NR 27 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C559 EP C572 DI 10.1016/0375-9474(93)90569-J PG 14 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300045 ER PT J AU GARRETT, JD ALTON, GD BAKTASH, C OLSEN, DK TOTH, KS AF GARRETT, JD ALTON, GD BAKTASH, C OLSEN, DK TOTH, KS TI THE OAK-RIDGE RADIOACTIVE ION-BEAM FACILITY SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID NUCLEAR SHAPES AB The Oak Ridge RIB Facility has been approved and is under construction. The general layout and capabilities of this facility are described, as is the possibility of studying nuclei near the 100Sn double closed shell, new regions of exotic nuclear shapes, proton halo nuclei, and rp-process nucleosynthesis. RP GARRETT, JD (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 37 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C701 EP C714 PG 14 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300057 ER PT J AU HANNACHI, F SCHUCK, C BASTIN, G DELONCLE, I GALL, B PORQUET, MG SMITH, AG AZAIEZ, F BOURGEOIS, C DUPRAT, J KORICHI, A PERRIN, N POFFE, N SERGOLLE, H ASTIER, A LECOZ, Y MEYER, M REDON, N BENTLEY, M SIMPSON, J SHARPEYSCHAFER, JF JOYCE, MJ BEAUSANG, CW FALLON, P PAUL, ES DAGNALL, PJ FORBES, SA GALE, S JONES, PM WADSWORTH, R CLARK, RM ALEONARD, MM CURIEN, D DEFRANCE, G CARPENTER, M HENRY, R LAURITSEN, T WILLSAU, P AF HANNACHI, F SCHUCK, C BASTIN, G DELONCLE, I GALL, B PORQUET, MG SMITH, AG AZAIEZ, F BOURGEOIS, C DUPRAT, J KORICHI, A PERRIN, N POFFE, N SERGOLLE, H ASTIER, A LECOZ, Y MEYER, M REDON, N BENTLEY, M SIMPSON, J SHARPEYSCHAFER, JF JOYCE, MJ BEAUSANG, CW FALLON, P PAUL, ES DAGNALL, PJ FORBES, SA GALE, S JONES, PM WADSWORTH, R CLARK, RM ALEONARD, MM CURIEN, D DEFRANCE, G CARPENTER, M HENRY, R LAURITSEN, T WILLSAU, P TI STUDY OF THE SUPERDEFORMED BAND IN PB-194 AND HG-192 WITH EUROGAM SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS AB A subset of the Eurogam array has been used to investigate the decay out of the superdeformed (SD) band in 194Pb. Two new band members and a new decay pattern into the low lying states at normal deformation (ND) have been established for this band. In the level scheme at normal deformation, the linking transitions between the previously known floating DELTA I=l sequence and the lower states have been established for the first time. In this talk we will also report on the preliminary results of the search for the linking transitions between the SD and ND states in 192Hg with the fully operational EUROGAM array. C1 CSNSM,CNRS,F-91405 ORSAY,FRANCE. IPN,F-91406 ORSAY,FRANCE. UNIV OXFORD,DEPT PHYS,OXFORD,ENGLAND. UNIV LYON 1,IPN,F-69622 VILLEURBANNE,FRANCE. STAFFORDSHIRE POLYTECH,STOKE ON TRENT ST4 2DE,ENGLAND. UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,ENGLAND. CENBG,F-33175 GRADIGNAN,FRANCE. CRN,F-67037 STRASBOURG,FRANCE. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV BONN,INST STRAHLEN & KERNPHYS,W-5300 BONN,GERMANY. RP HANNACHI, F (reprint author), SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. RI CURIEN, Dominique/B-6718-2013; Carpenter, Michael/E-4287-2015 OI Carpenter, Michael/0000-0002-3237-5734 NR 12 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C75 EP C82 PG 8 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300008 ER PT J AU JOHNSON, NR WELLS, JC MCGOWAN, FK WINCHELL, DF LEE, IY SEMMES, P BAKTASH, C GARRETT, JD AKOVALI, YA BENGTSSON, R WYSS, R MA, WC GAO, WB YU, CH PILOTTE, S AF JOHNSON, NR WELLS, JC MCGOWAN, FK WINCHELL, DF LEE, IY SEMMES, P BAKTASH, C GARRETT, JD AKOVALI, YA BENGTSSON, R WYSS, R MA, WC GAO, WB YU, CH PILOTTE, S TI TEST OF PREDICTED DEFORMATION DRIVING EFFECTS IN RE-173 SO NUCLEAR PHYSICS A LA English DT Article ID TRANSITION QUADRUPOLE-MOMENTS; HIGH-SPIN STATES; BAND CROSSINGS; OS-172; ISOTOPES AB Lifetime measurements on the 5/2+[402] band in Re-173 have been carried out by the recoil-distance technique. Lifetimes of the stretched E2 transitions in both signatures of this band were measured up to a spin of 35/2+ as were the lifetimes of most of the Ml transitions between the two signatures. Large deformation increases were found in both signatures at low rotational frequencies (homegaBAR almost-equal-to 160 keV) as predicted by TRS calculations and, thus, offer new insight into the behavior of the 5/2+[402] band in Re-173 and perhaps into other light nuclei in this region. The B(M1) values also show an increase at about the same rotational frequency. Particle-rotor calculations can account qualitatively for the observed transition rates. C1 TENNESSEE TECHNOL UNIV, COOKEVILLE, TN 38505 USA. UNISOR, OAK RIDGE INST SCI EDUC, OAK RIDGE, TN 37831 USA. JOINT INST HEAVY ION RES, OAK RIDGE, TN 37831 USA. VANDERBILT UNIV, NASHVILLE, TN 37235 USA. UNIV TENNESSEE, KNOXVILLE, TN 37916 USA. RP OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 25 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C347 EP C359 PG 13 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300029 ER PT J AU KHOO, TL LAURITSEN, T AHMAD, I CARPENTER, MP FERNANDEZ, PB JANSSENS, RVF MOORE, EF WOLFS, FLH BENET, P DALY, PJ BEARD, KB GARG, U YE, D DRIGERT, MW AF KHOO, TL LAURITSEN, T AHMAD, I CARPENTER, MP FERNANDEZ, PB JANSSENS, RVF MOORE, EF WOLFS, FLH BENET, P DALY, PJ BEARD, KB GARG, U YE, D DRIGERT, MW TI FEEDING AND DECAY OF SUPERDEFORMED STATES SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID BANDS; NUCLEI AB The mechanisms for feeding and decay of superdeformed (SD) bands are examined. Data connected with both processes in 192Hg are compared with model calculations. The calculations successfully reproduce the data, suggesting that the mechanisms for both processes are understood. Constraints on the energy of the SD band energies and on the well-depths at low and high spins have been obtained. At the point of decay around spin 10, we suggest that the SD band is 3.3-4.3 MeV above the normal yrast line and that the well depths at spin 10 and 40 are 0.5-1.3 and 3.5-4.5 MeV, respectively. C1 PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV NOTRE DAME,NOTRE DAME,IN 46556. IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP KHOO, TL (reprint author), ARGONNE NATL LAB,DIV PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Carpenter, Michael/E-4287-2015 OI Carpenter, Michael/0000-0002-3237-5734 NR 16 TC 27 Z9 27 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C83 EP C97 PG 15 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300009 ER PT J AU REVIOL, W GARG, U AHMAD, I APRAHAMIAN, A CARPENTER, MP DAVIS, BF JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y NAGULESWARAN, S WALPE, JC YE, D AF REVIOL, W GARG, U AHMAD, I APRAHAMIAN, A CARPENTER, MP DAVIS, BF JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y NAGULESWARAN, S WALPE, JC YE, D TI SPECTROSCOPY OF RU-96, RU-97, RU-98 - POSSIBLE EMERGENCE OF COLLECTIVITY AT N-GREATER-THAN-OR-EQUAL-TO-52 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID NUCLEI AB Detailed experimental information on high-spin states (up to approximately 20 hBAR) in the N greater-than-or-equal-to 52 nuclei Ru-96, Ru-97, Ru-98 has been obtained from gamma-ray spectroscopic studies following (Cu(S,pxn))-Cu-65-S-36 reactions. The level schemes exhibit sequences of presumably negative-parity states linked by E2 transitions with monotonously increasing energies. These sequences coexist with the positive-parity yrast states where the transition energies are rather irregular. The negative-parity structures are suggestive of the emergence of rotational collectivity. The data are compared with TRS calculations for deformed h11/2 neutron configurations. C1 UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RI Naguleswaran, Sanjeev/A-4305-2013; Carpenter, Michael/E-4287-2015 OI Carpenter, Michael/0000-0002-3237-5734 NR 13 TC 10 Z9 10 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C391 EP C400 DI 10.1016/0375-9474(93)90556-D PG 10 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300032 ER PT J AU THOENNESSEN, M BEENE, JR AF THOENNESSEN, M BEENE, JR TI INFLUENCE OF DISSIPATION ON THE POPULATION AND DECAY OF COMPOUND NUCLEI SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI CY OCT 26-30, 1992 CL UNIV TOKYO, HONGO CAMPUS, TOKYO, JAPAN SP UNIV TOKYO, INST NUCL STUDY, INST PHYS & CHEM RES, JAPAN ATOM ENERGY RES INST, NISHINA MEM FDN & COMMEMORAT ASSOC JAPAN WORLD EXPOSIT HO UNIV TOKYO, HONGO CAMPUS ID GIANT-DIPOLE-RESONANCE; HOT ROTATING NUCLEI; SUPERDEFORMED BANDS; NEUTRON EMISSION; FUSION-FISSION; TIME SCALES; EVAPORATION; NI-64+ZR-92; DEFORMATION; COLLISIONS AB The importance of nuclear dissipative effects in the formation and decay of compound nuclei is investigated with the gamma-ray decay of the giant dipole resonance built on highly excited states. These studies show evidence for long formation times (approximately 10(-20)s) in heavy, almost symmetric systems. Enhanced gamma-ray emission is observed in the decay of fissile nuclei because of the dynamical hindrance of fission. This effect allows the study of hot nuclei prior to fission and it also influences the spin distribution leading to evaporation residues. C1 MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP THOENNESSEN, M (reprint author), MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824, USA. NR 33 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 31 PY 1993 VL 557 BP C247 EP C256 PG 10 WC Physics, Nuclear SC Physics GA LQ803 UT WOS:A1993LQ80300021 ER PT J AU YEE, K AF YEE, K TI GAUGE DEPENDENCE OF EFFECTIVE QUARK MASS AND MATRIX-ELEMENTS IN GAUGE FIXED LARGE N STRONG-COUPLING LATTICE QCD SO NUCLEAR PHYSICS B LA English DT Article ID CHIRAL SYMMETRY-BREAKING; GLUON PROPAGATOR; LANDAU GAUGE; PHOTON; LIMIT; WALK AB In conjunction with recent numerical lambda partial derivative 0A0 + del . A = 0 ''lambda-gauge'' results reported in a companion paper, we construct an N --> infinity Wilson loop picture of lambda-gauge fixing in which (i) the lambda-gauge expectation value of a link chain C is the weighted sum over Wilson loops made by joining to C all selfavoiding chains C closing C. (ii) Weights A(C), containing all the lambda-dependence, are given by the beta = 0 lambda-gauge expectation value of C. (iii) A(C) equals path-products of coefficients from the trace expansion of the gauge fixing Boltzmann weight. From (ii) and (iii) we deduce formulas for beta = 0 quark matrix elements. We find that M(q)(lambda) decreases with increasing lambda; the quark propagator dispersion relation is not covariant when lambda not-equal 1; and DELTAI = 1/2 matching coefficients are lambda-independent. These strong coupling features are qualitatively consistent with numerical beta = 5.7 and 6.0 results briefly described here for comparison purposes but mainly presented in a companion paper. RP YEE, K (reprint author), BROOKHAVEN NATL LAB,PHYS THEORY GRP,UPTON,NY 11973, USA. NR 34 TC 3 Z9 3 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 MAY 31 PY 1993 VL 397 IS 3 BP 564 EP 590 DI 10.1016/0550-3213(93)90186-S PG 27 WC Physics, Particles & Fields SC Physics GA LF057 UT WOS:A1993LF05700005 ER PT J AU BERERA, A AF BERERA, A TI BORN EXPANSION TO ALL ORDERS FOR THE HETEROTIC STRING SO NUCLEAR PHYSICS B LA English DT Article ID PERTURBATION-THEORY; SUPERMODULI; GEOMETRY AB A perturbation expansion to all orders in loops is developed for the E8 x E8 heterotic string. A light-cone gauge lagrangian is presented and applied within the functional-integral formalism of Mandelstam to compute scattering amplitudes. Unitarity is manifest and the final answer is Lorentz invariant. It is shown that the determinant arising from the functional integration associated with the compactified degrees is analytic. This along with its modular properties, gives a unique specification of it up to an overall moduli-independent factor. C1 LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. NR 17 TC 2 Z9 2 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 MAY 31 PY 1993 VL 397 IS 3 BP 616 EP 647 DI 10.1016/0550-3213(93)90188-U PG 32 WC Physics, Particles & Fields SC Physics GA LF057 UT WOS:A1993LF05700007 ER PT J AU CHAU, LL HUANG, DW AF CHAU, LL HUANG, DW TI SALIENT FEATURES OF HIGH-ENERGY MULTIPARTICLE DISTRIBUTIONS LEARNED FROM EXACT-SOLUTIONS OF THE ONE-DIMENSIONAL ISING-MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIPLICITY DISTRIBUTIONS; MOMENTS; COLLISIONS AB We have derived explicit expressions in the one-dimensional Ising model for multiplicity distributions P(deltaxi)(n) and factorial moments F(q)(deltaxi). We identify the salient features of P(deltaxi)(n) that lead to scaling, F(q)(deltaxi) = F(q)[F2], and universality. These results compare well with the presently available high-energy data of ppBAR and e+e- reactions. We point out the important features that should be studied in future higher-energy experiments of multiparticle productions in pp, ppBAR, ep, e+e-, and NN. We also make comments on comparisons with Koba-Nielsen-Olesen and negative-binomial distributions. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP CHAU, LL (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 14 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 31 PY 1993 VL 70 IS 22 BP 3380 EP 3383 DI 10.1103/PhysRevLett.70.3380 PG 4 WC Physics, Multidisciplinary SC Physics GA LE029 UT WOS:A1993LE02900006 ER PT J AU LAO, LL FERRON, JR TAYLOR, TS BURRELL, KH CHAN, VS CHU, MS DEBOO, JC DOYLE, EJ GREENFIELD, CM GROEBNER, RJ JAMES, R LAZARUS, EA OSBORNE, TH STJOHN, H STRAIT, EJ THOMPSON, SJ TURNBULL, AD WROBLEWSKI, D ZOHM, H AF LAO, LL FERRON, JR TAYLOR, TS BURRELL, KH CHAN, VS CHU, MS DEBOO, JC DOYLE, EJ GREENFIELD, CM GROEBNER, RJ JAMES, R LAZARUS, EA OSBORNE, TH STJOHN, H STRAIT, EJ THOMPSON, SJ TURNBULL, AD WROBLEWSKI, D ZOHM, H TI HIGH INTERNAL INDUCTANCE IMPROVED CONFINEMENT H-MODE DISCHARGES OBTAINED WITH AN ELONGATION RAMP TECHNIQUE IN THE DIII-D TOKAMAK SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY CONFINEMENT; PROFILES; REACTOR; JET AB High confinement mode (H-mode) discharges with peaked toroidal current density profile (high inductance, l(i)) and improved confinement are obtained in the DIII-D tokamak by dynamically varying the current profile using a rapid elongation ramp technique. The confinement improvement increases with l(i) and persists in the presence of edge-localized modes. The plasma toroidal rotation and the corresponding radial electric field component also increase with the peakedness of the current density profile. C1 UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. MAX PLANCK INST PLASMA PHYS, W-8046 GARCHING, GERMANY. RP GEN ATOM CO, SAN DIEGO, CA 92186 USA. NR 16 TC 48 Z9 48 U1 3 U2 8 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 31 PY 1993 VL 70 IS 22 BP 3435 EP 3438 DI 10.1103/PhysRevLett.70.3435 PG 4 WC Physics, Multidisciplinary SC Physics GA LE029 UT WOS:A1993LE02900020 ER PT J AU MOOK, HA YETHIRAJ, M AEPPLI, G MASON, TE ARMSTRONG, T AF MOOK, HA YETHIRAJ, M AEPPLI, G MASON, TE ARMSTRONG, T TI POLARIZED NEUTRON DETERMINATION OF THE MAGNETIC EXCITATIONS IN YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY-GAP; SCATTERING AB Polarization analysis has been used to identify the magnetic excitations in YBa2Cu3O7. The dominant feature in the spectra is a peak at the (pi,pi) reciprocal lattice position and centered at 41 meV. The behavior of the peak is shown to change dramatically at T(c), so that the magnetic excitations responsible for the peak must be strongly coupled to the superconductivity. Below an energy of about 35 meV, superconductivity suppresses the continuum scattering found in addition to the 41-meV peak. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RISO NATL LAB,DK-4000 ROSKILDE,DENMARK. ALLIED SIGNAL CORP,TORRANCE,CA 90509. RP MOOK, HA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Mason, Thomas/M-5809-2014 OI Mason, Thomas/0000-0003-1880-3971 NR 14 TC 367 Z9 369 U1 1 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 31 PY 1993 VL 70 IS 22 BP 3490 EP 3493 DI 10.1103/PhysRevLett.70.3490 PG 4 WC Physics, Multidisciplinary SC Physics GA LE029 UT WOS:A1993LE02900034 ER PT J AU RODER, H BISHOP, AR GAMMEL, JT AF RODER, H BISHOP, AR GAMMEL, JT TI SPIN-PEIERLS GROUND-STATES AND FRUSTRATION IN A MULTIBAND PEIERLS-HUBBARD MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID ISING-MODEL; CRYSTALS; ELECTRON; PLANES AB We discuss the consequences of including both electron-phonon and electron-electron couplings in multiband models, focusing on numerical studies of a one-dimensional two-band model in the intermediate regime for both coupling strengths. Spin-Peierls as well as long-period, frustrated ground states are identified, reminiscent of those found in axial next-nearest-neighbor Ising models. We speculate on experimentally observable signatures of this rich phase diagram. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NCCOSC,DIV RDT&E,NRAD,MAT RES BRANCH,SAN DIEGO,CA 92152. RP RODER, H (reprint author), UNIV BAYREUTH,INST PHYS,W-8580 BAYREUTH,GERMANY. NR 31 TC 30 Z9 30 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 31 PY 1993 VL 70 IS 22 BP 3498 EP 3501 DI 10.1103/PhysRevLett.70.3498 PG 4 WC Physics, Multidisciplinary SC Physics GA LE029 UT WOS:A1993LE02900036 ER PT J AU GERMAN, KAH WEARE, CB VAREKAMP, PR ANDERSEN, JN YARMOFF, JA AF GERMAN, KAH WEARE, CB VAREKAMP, PR ANDERSEN, JN YARMOFF, JA TI SITE-SPECIFIC NEUTRALIZATION OF LOW-ENERGY LI-7(+) SCATTERED FROM NA/AL(100) SO PHYSICAL REVIEW LETTERS LA English DT Article ID ION-SCATTERING; CHARGE-EXCHANGE; ALKALI IONS; SURFACES; ALUMINUM; GEOMETRY; CU(110); NA AB Site-specific neutralization is seen for low energy (1-5 keV) Li-7+ ions scattered at large angles from Na-covered Al(100). Energy spectra of the ion yield are collected near the surface normal as a function of Na coverage. Li+ singly scattered from Na is almost completely neutralized, while the neutralization of ions scattered from Al is fairly insensitive to coverage, indicating a large difference in the local electrostatic potential above Na and Al sites. This shows that the phenomena of resonant charge exchange is capable of resolving atomic scale variations in the surface potential. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LUND UNIV,INST PHYS,DEPT SYNCHROTRON RADIAT RES,S-22362 LUND,SWEDEN. RP GERMAN, KAH (reprint author), UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521, USA. NR 19 TC 40 Z9 40 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 MAY 31 PY 1993 VL 70 IS 22 BP 3510 EP 3513 DI 10.1103/PhysRevLett.70.3510 PG 4 WC Physics, Multidisciplinary SC Physics GA LE029 UT WOS:A1993LE02900039 ER PT J AU LAGATTUTA, KJ OLSON, GL COMLY, JC AF LAGATTUTA, KJ OLSON, GL COMLY, JC TI INVERTED CONTINUA IN X-RAY LASER-PUMPED PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Note RP LAGATTUTA, KJ (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 31 PY 1993 VL 70 IS 22 BP 3520 EP 3520 DI 10.1103/PhysRevLett.70.3520 PG 1 WC Physics, Multidisciplinary SC Physics GA LE029 UT WOS:A1993LE02900043 ER PT J AU CHRZAN, DC MILLS, MJ AF CHRZAN, DC MILLS, MJ TI COLLECTIVE BEHAVIOR AND SUPERDISLOCATION MOTION IN L12 ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT EUROPEAN RESEARCH CONF ON PLASTICITY OF MATERIALS - FUNDAMENTAL ASPECTS OF DISLOCATION INTERACTIONS : LOW-ENERGY DISLOCATION STRUCTURES 3 CY AUG 30-SEP 04, 1992 CL ASCONA, SWITZERLAND SP EUROPEAN SCI FDN, COMMISS EUROPEAN COMMUNITIES, CTR STEFANO FRANSCINI, SWISS FED INST TECHNOL ZURICH ID YIELD STRESS; TEMPERATURE; DEPENDENCE; NI3AL; FLOW AB A simulation of superdislocation motion applicable to L1(2) intermetallic alloys displaying the yield stress anomaly has been developed. The simulations incorporate a cross-slip-pinning mechanism and allow direct study of the spatial and temporal correlations between pinning events. The predicted dislocation structures agree well with available experimental observations. The relationship between the pinning-point correlations and the mechanical properties of the alloys is explicitly investigated. The superdislocations are shown to undergo a stress-driven, non-equilibrium phase transition. The critical exponents of the transition are shown to be related to strain hardening. Theoretical predictions for the exponents are in excellent agreement with the algebraic form of primary creep transients for Ni3Al within the temperature range of the flow strength anomaly. The importance of treating dislocation-level phenomena on an equal footing with detailed microscopic mechanisms is stressed. RP CHRZAN, DC (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 20 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1993 VL 164 IS 1-2 BP 82 EP 92 DI 10.1016/0921-5093(93)90645-U PG 11 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LK050 UT WOS:A1993LK05000009 ER PT J AU HEMKER, KJ VIGUIER, B MILLS, MJ AF HEMKER, KJ VIGUIER, B MILLS, MJ TI DISLOCATION CORE STRUCTURES IN THE ORDERED INTERMETALLIC ALLOY TIAL SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID DEFORMATION MECHANISMS; DISSOCIATION; TEMPERATURE AB Evidence for the locking of both ''ordinary'' (b=(a/2)[110]) and ''super'' (b=a[101]) dislocations has been reported in the literature, and possible models for the locking processes have been proposed. In the present study, high resolution transmission electron microscopy (HREM) and calculated image simulations were combined to provide atomic level observations of these dislocation core structures. The results of this study suggest that the core of ordinary dislocations is compact and that the motion of these dislocations is inhibited by intrinsic lattice friction and not by dislocation core dissociations. In contrast, the core of screw superdislocations was observed to be dissociated in a non-planar configuration. The results suggest that the leading super partial dislocation cross-slipped from one {111} plane to a cube plane and then redissociated on another {111} plane. The end result of this process is a sessile configuration that contains an intrinsic stacking fault on the (111BAR) plane, an extrinsic stacking fault on the (111) plane, and an antiphase boundary on the (010) plane in between. C1 SANDIA NATL LABS,DEPT MAT,LIVERMORE,CA 94551. RP HEMKER, KJ (reprint author), ECOLE POLYTECH FED LAUSANNE,INST GENIE ATOM,CH-1015 LAUSANNE,SWITZERLAND. RI Hemker, Kevin/A-3315-2010 NR 8 TC 61 Z9 62 U1 0 U2 10 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 MAY 30 PY 1993 VL 164 IS 1-2 BP 391 EP 394 DI 10.1016/0921-5093(93)90699-F PG 4 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LK050 UT WOS:A1993LK05000063 ER PT J AU WANG, XQ WANG, CZ ZHANG, BL HO, KM AF WANG, XQ WANG, CZ ZHANG, BL HO, KM TI WHICH D2 FULLERENE ISOMER OF C-84 HAS BEEN OBSERVED SO CHEMICAL PHYSICS LETTERS LA English DT Article ID C-60; C-84; C60 AB We present the results of a first-principles study for the geometries, energies and electronic properties of four C84 fullerene isomers that have the D2 symmetry and satisfy the isolated-pentagon rule. Our approach is based on the all-electron local-density functional method for molecules with complete geometry optimization. Comparison of the results from the present calculation with available experimental data favors the ground-state D2 isomer over the one proposed by the ring-stacking model. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,DEPT PHYS & ASTRON,AMES,IA 50011. RP WANG, XQ (reprint author), CLARK COLL,CTR THEORET STUDIES PHYS SYST,ATLANTA,GA 30314, USA. NR 22 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 28 PY 1993 VL 207 IS 4-6 BP 349 EP 353 DI 10.1016/0009-2614(93)89012-7 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LD759 UT WOS:A1993LD75900011 ER PT J AU JANKOWIAK, R SMALL, GJ AF JANKOWIAK, R SMALL, GJ TI ORIGIN OF THE T1.3 POWER-LAW OF PURE DEPHASING FOR IMPURITY ELECTRONIC-TRANSITIONS IN AMORPHOUS SOLIDS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID TEMPERATURE GLASS DYNAMICS; HOLE-BURNING LINEWIDTHS; 2-LEVEL SYSTEMS; PHOTON-ECHO; FLUORESCENCE LINEWIDTHS; OPTICAL-TRANSITIONS; RELAXATION; DENSITY; STATES; IONS AB The standard tunnel model together with the diagonal modulation theory of dephasing has previously been used to explain the above power law for impurity electronic transitions for T less than or similar to 10 K. Crude approximations made in averaging over the two-level system (TLS) parameters led to the widely held view that the exponent is 1 + mu where mu is the exponent of the TLS density of states, rho(E) = rho0E(mu). We show that this is incorrect and that the temperature dependence is determined by the average value of the TLS asymmetry parameter [DELTA]E, where E is the tunnel splitting. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP JANKOWIAK, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 46 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 28 PY 1993 VL 207 IS 4-6 BP 436 EP 442 DI 10.1016/0009-2614(93)89026-E PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LD759 UT WOS:A1993LD75900025 ER PT J AU KIM, WH MCPHILLEN, M HAYES, JM SMALL, GJ AF KIM, WH MCPHILLEN, M HAYES, JM SMALL, GJ TI A NEW METHODOLOGY FOR PRODUCTION OF HYPERQUENCHED GLASSY FILMS AND THEIR STUDY BY NONPHOTOCHEMICAL HOLE-BURNING SO CHEMICAL PHYSICS LETTERS LA English DT Article ID CHROMATOGRAPHY MASS-SPECTROMETRY; LIQUID WATER; SPECTROSCOPY; CLUSTERS; STATES; ICE AB Thermospray deposition, a new method for the production of glassy films, is described. Infrared spectra of the hydroxyl stretch of glassy water films are presented. The use of hole burning spectroscopy to sensitively distinguish differences in the properties of amorphous films is illustrated for oxazine 720-doped ethanol-d1 films. C1 IOWA STATE UNIV SCI & TECHNOL,USDOE,AMES LAB,AMES,IA 50011. RP KIM, WH (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 22 TC 11 Z9 11 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 28 PY 1993 VL 207 IS 4-6 BP 443 EP 449 DI 10.1016/0009-2614(93)89027-F PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LD759 UT WOS:A1993LD75900026 ER PT J AU DAVIS, JE HUGHES, RS LEE, HWH AF DAVIS, JE HUGHES, RS LEE, HWH TI INVESTIGATION OF OPTICALLY GENERATED TRANSIENT ELECTRONIC DEFECTS AND PROTONIC TRANSPORT IN HYDROGEN-BONDED MOLECULAR-SOLIDS - ISOMORPHS OF POTASSIUM DIHYDROGEN PHOSPHATE SO CHEMICAL PHYSICS LETTERS LA English DT Article AB Recent results are reported from our study of a new class of transient electronic defects generated with ultraviolet (UV) photons in hydrogen-bonded molecular solids represented by isomorphs of dihydrogen phosphate. At room temperature, the defect forms 1.6 +/- 0.4 ps after UV two-photon excitation, decays nonexponentially in almost-equal-to 20 s, and absorbs from the UV to the near-IR. The defect is identified as a HPO4- radical and supports proposed formation and decay mechanisms based on protonic transport. These findings also call into question interpretations of ionizing radiation results. C1 LAWRENCE LIVERMORE NATL LAB,L-45,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT APPL SCI,LIVERMORE,CA 94550. NR 16 TC 44 Z9 50 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 28 PY 1993 VL 207 IS 4-6 BP 540 EP 545 DI 10.1016/0009-2614(93)89044-I PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LD759 UT WOS:A1993LD75900043 ER PT J AU PAHLER, M CALDWELL, CD SCHAPHORST, SJ KRAUSE, MO AF PAHLER, M CALDWELL, CD SCHAPHORST, SJ KRAUSE, MO TI INTRINSIC LINEWIDTHS OF NEON 2S2P(5)((1,3)P)NL (2)L-CORRELATION SATELLITES SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID PHOTOELECTRON SPECTROMETRY; SYNCHROTRON RADIATION; AUGER; ATOMS; PHOTOIONIZATION; PARTICIPATOR AB The intrinsic linewidths of 2s2p5(1,3P)3s2P and 2s2p5(1,3P)3p2S Correlation satellites were determined from high resolution photoelectron spectra. We find widths of 0.41(5) eV for the (1P)3p2S satellite and 0.11(4) eV for the (3P)3p2S satellite. This confirms the prediction that the decay of the (1P)3p2S state is dominated by a multiplet Auger transition to the 2s2p5(3P) ionic state. The resulting broadening of the (1P)3p2S line is considerably overestimated by a relaxed single-configuration Hartree-Fock calculation, indicating the presence of strong many-electron interactions. In addition, an identification of several new lines of the conjugate shakeup 2s2p5(1P)ns2P Rydberg series and a measurement of the relative line strengths of the satellite excitations are presented. C1 UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 17 TC 37 Z9 37 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAY 28 PY 1993 VL 26 IS 10 BP 1617 EP 1622 DI 10.1088/0953-4075/26/10/004 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LL811 UT WOS:A1993LL81100004 ER PT J AU PLANO, MA LANDSTRASS, MI PAN, LS HAN, S KANIA, DR MCWILLIAMS, S AGER, JW AF PLANO, MA LANDSTRASS, MI PAN, LS HAN, S KANIA, DR MCWILLIAMS, S AGER, JW TI POLYCRYSTALLINE CVD DIAMOND FILMS WITH HIGH ELECTRICAL MOBILITY SO SCIENCE LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; DEVICE APPLICATIONS; SCHOTTKY DIODES; TEMPERATURE AB Advances in the deposition process have led to dramatic improvements in the electronic properties of polycrystalline diamond films produced by chemical vapor deposition (CVD). It is now possible to produce CVD diamond with properties approaching those of IIa natural diamonds. The combined electron-hole mobility, as measured by transient photoconductivity at low carrier density, is 4000 square centimeters per volt per second at an electric field of 200 volts per centimeter and is comparable to that of the best single-crystal IIa natural diamonds. Carrier lifetimes measured under the same conditions are 150 picoseconds for the CVD diamond and 300 picoseconds for single-crystal diamond. The collection distance at a field of 10 kilovolts per centimeter is 15 micrometers for the CVD diamond as compared to 30 micrometers for natural diamonds. The electrical qualities appear to correlate with the width of the diamond Raman peak. Also, although the collection distance at the highest fields in the films nearly equals the average grain size, there is no evidence of deleterious grain boundary effects. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP PLANO, MA (reprint author), CRYSTALLUME, 125 CONSTITUT DR, MENLO PK, CA 94025 USA. OI Ager, Joel/0000-0001-9334-9751 NR 20 TC 22 Z9 23 U1 1 U2 10 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 MAY 28 PY 1993 VL 260 IS 5112 BP 1310 EP 1312 DI 10.1126/science.260.5112.1310 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LE025 UT WOS:A1993LE02500038 PM 17755424 ER PT J AU HARDING, LB GUADAGNINI, R SCHATZ, GC AF HARDING, LB GUADAGNINI, R SCHATZ, GC TI THEORETICAL-STUDIES OF THE REACTIONS H+CH-]C+H2 AND C+H2-]CH2 USING AN ABINITIO GLOBAL GROUND-STATE POTENTIAL SURFACE FOR CH2 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ABSORPTION SPECTROSCOPY; ENERGY SURFACES; RATE CONSTANTS; ATOMIC CARBON; METHYLENE; HYDROGEN; DYNAMICS; MOLECULE; C(23PJ) AB Ab initio, multireference, configuration interaction (CI) calculations have been used to characterize the groundstate potential surface of methylene. The calculations employ a full-valence, complete-active-space reference wave function and a (4s,3p,2d,1f/3s,2p,1d) basis set. The calculations were carried out at approximately 6000 points, and the resulting energies were fit to a many-body expansion including conical intersections between the B-3(1) and 3A2 states for C2v geometries and between the 3PI and 3SIGMA- states for linear geometries. The calculations show that the C2v conical intersection provides a zero barrier route for the C(3P) + H-2 insertion reaction. Quasiclassical trajectory studies of the title reactions using the global surface indicate that both reactions proceed without activation energy and that the thermal rate constants are nearly independent of temperature. The rate constants for H + CH agree with high-temperature (2000 K) experimental studies but are substantially higher (factor of 10) than a measurement at 297 K. For C + H-2, the CH2 lifetimes at thermal energies are approximately 20 ps which is in agreement with an experimentally derived estimate. C1 NORTHWESTERN UNIV, DEPT CHEM, EVANSTON, IL 60208 USA. ARGONNE NATL LAB, DIV CHEM, THEORET CHEM GRP, ARGONNE, IL 60439 USA. NR 26 TC 82 Z9 83 U1 2 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 27 PY 1993 VL 97 IS 21 BP 5472 EP 5481 DI 10.1021/j100123a005 PG 10 WC Chemistry, Physical SC Chemistry GA LE401 UT WOS:A1993LE40100005 ER PT J AU CAMAIONI, DM AUTREY, ST FRANZ, JA AF CAMAIONI, DM AUTREY, ST FRANZ, JA TI HYDROGEN-TRANSFER BETWEEN ANTHRACENE STRUCTURES - COMMENT SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Note ID RATE CONSTANTS; BOND SCISSION; LIQUEFACTION; ABSTRACTION; RADICALS RP CAMAIONI, DM (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 24 TC 16 Z9 16 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 27 PY 1993 VL 97 IS 21 BP 5791 EP 5792 DI 10.1021/j100123a055 PG 2 WC Chemistry, Physical SC Chemistry GA LE401 UT WOS:A1993LE40100055 ER PT J AU SHAM, TK JIANG, DT COULTHARD, I LORIMER, JW FENG, XH TAN, KH FRIGO, SP ROSENBERG, RA HOUGHTON, DC BRYSKIEWICZ, B AF SHAM, TK JIANG, DT COULTHARD, I LORIMER, JW FENG, XH TAN, KH FRIGO, SP ROSENBERG, RA HOUGHTON, DC BRYSKIEWICZ, B TI ORIGIN OF LUMINESCENCE FROM POROUS SILICON DEDUCED BY SYNCHROTRON-LIGHT-INDUCED OPTICAL LUMINESCENCE SO NATURE LA English DT Article ID EMISSION AB FOLLOWING reports of intense optical luminescence from porous silicon1,2, the opportunity for engineering optoelectronic devices using this material3,4 has attracted considerable attention. At present, however, the question of the origin of the luminescence has not been fully resolved5. The quantum-confinement model6-8 suggests that a quantum size effect gives optical transitions, and hence luminescence, in the visible range - this idea gains support from the wavelength dependence of the luminescence on porosity. An alternative model9,10 attributes the luminescence to siloxene-like compounds11 formed on the silicon surface. A third model, which invokes hydrogenated amorphous silicon as a possible source12,13, seems to be contradicted by X-ray absorption fine structure (XAFS) studies14-16. Here we report optical luminescence in porous silicon and siloxene induced by soft X-rays with energies near the silicon K-edge (1,839 eV). Using the luminescence together with the total electron yield, we can obtain the XAFS spectra for the luminescent sites in both materials. Our results show that the luminescence from porous silicon does not derive from siloxene (either freshly prepared or annealed), and thus suggest that the quantum-confinement model seems to provide the only viable explanation. C1 UNIV WISCONSIN MADISON,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. ARGONNE NATL LAB,ARGONNE,IL 60439. NATL RES COUNCIL CANADA,INST MICROSTRUCT SCI,OTTAWA K1A 0R6,ONTARIO,CANADA. RP SHAM, TK (reprint author), UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. RI Rosenberg, Richard/K-3442-2012 NR 28 TC 166 Z9 168 U1 1 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 MAY 27 PY 1993 VL 363 IS 6427 BP 331 EP 334 DI 10.1038/363331a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LD917 UT WOS:A1993LD91700046 ER PT J AU WOYCHIK, RP WASSOM, JS KINGSBURY, D AF WOYCHIK, RP WASSOM, JS KINGSBURY, D TI TBASE - A COMPUTERIZED DATABASE FOR TRANSGENIC ANIMALS AND TARGETED MUTATIONS SO NATURE LA English DT Article C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP WOYCHIK, RP (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 5 TC 21 Z9 21 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 27 PY 1993 VL 363 IS 6427 BP 375 EP 376 DI 10.1038/363375a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LD917 UT WOS:A1993LD91700061 PM 8497324 ER PT J AU DELDUCA, V PESKIN, ME TANG, WK AF DELDUCA, V PESKIN, ME TANG, WK TI COMPUTATION OF MINIJET INCLUSIVE CROSS-SECTIONS SO PHYSICS LETTERS B LA English DT Article ID SINGULARITY; QCD AB We apply the theory of parton-parton total cross sections at large s, due to Lipatov and collaborators, to compute the inclusive cross section for jets which accompany a large s parton scattering process. RP DELDUCA, V (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 13 TC 16 Z9 16 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 MAY 27 PY 1993 VL 306 IS 1-2 BP 151 EP 157 DI 10.1016/0370-2693(93)91153-E PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LD884 UT WOS:A1993LD88400026 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DABBOUS, H DESCH, K DIEKMANN, B DOEKER, T GEERTS, M GEITZ, G GUTJAHR, B HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FAWCETT, HF FOSTER, B GILMORE, R HEATH, GP LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS RAU, RR ARNEODO, M BARILLARI, T SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L BEDNAREK, B BORZEMSKI, P ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK I GLASER, R GOTTLICHER, P HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOTZ, U KOWALSKI, H KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D PARK, IH POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T TURKOT, F VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES Jr JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A KROGER, W LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SEIDMAN, A SCHOTT, W TERRON, J WIIK, BH ZETSCHE, F BACON, TC BUTTERWORTH I MARKOU, C MCQUILLAN, D MILLER, DB MOBAYYEN, MM PRINIAS, A VORVOLAKOS, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D CHEN, L MLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R YOSHIDA, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, SK ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A BADURA, E BILTZINGER, J CHAVES, H ROST, M SEIFERT, RJ WALENTA, AH WEIHS, W ZECH, G DAGAN, S LEVY, A ZERZION, D HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K GIBAUT, DB KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y AF DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DABBOUS, H DESCH, K DIEKMANN, B DOEKER, T GEERTS, M GEITZ, G GUTJAHR, B HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FAWCETT, HF FOSTER, B GILMORE, R HEATH, GP LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS RAU, RR ARNEODO, M BARILLARI, T SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L BEDNAREK, B BORZEMSKI, P ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GLASER, R GOTTLICHER, P HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOTZ, U KOWALSKI, H KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D PARK, IH POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T TURKOT, F VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES, JR JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A KROGER, W LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SEIDMAN, A SCHOTT, W TERRON, J WIIK, BH ZETSCHE, F BACON, TC BUTTERWORTH, I MARKOU, C MCQUILLAN, D MILLER, DB MOBAYYEN, MM PRINIAS, A VORVOLAKOS, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D CHEN, L MLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL, V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R YOSHIDA, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, SK ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR, I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A BADURA, E BILTZINGER, J CHAVES, H ROST, M SEIFERT, RJ WALENTA, AH WEIHS, W ZECH, G DAGAN, S LEVY, A ZERZION, D HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K GIBAUT, DB KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI OBSERVATION OF 2-JET PRODUCTION IN DEEP-INELASTIC SCATTERING AT HERA SO PHYSICS LETTERS B LA English DT Article ID CENTRAL TRACKING DETECTOR; LUND MONTE-CARLO; JET FRAGMENTATION; MUON SCATTERING; E+E-PHYSICS AB A sample of events with two distinct jets, in addition to the proton remnant, has been identified in deep inelastic, neutral current ep interactions recorded at HERA by the ZEUS experiment. For these events, the mass of the hadronic system ranges from 40 to 260 GeV. The salient features of the observed jet production agree with the predictions of higher order QCD. C1 UNIV WARSAW, INST EXPTL PHYS, PL-00325 WARSAW, POLAND. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. INST NUCL STUDY, WARSAW, POLAND. VIRGINIA POLYTECH INST & STATE UNIV, DEPT PHYS, BLACKSBURG, VA 24061 USA. UNIV LONDON UNIV COLL, DEPT PHYS & ASTRON, LONDON WC1E 6BT, ENGLAND. YORK UNIV, DEPT PHYS, N YORK M3J 1P3, ONTARIO, CANADA. WEIZMANN INST SCI, DEPT NUCL PHYS, IL-76100 REHOVOT, ISRAEL. UNIV TORONTO, DEPT PHYS, TORONTO M5S 1A1, ONTARIO, CANADA. UNIV TORINO, FAC SCI, ALESSANDRIA, ITALY. INFN, TURIN, ITALY. UNIV SALERNO, DIPARTIMENTO FIS, I-84100 SALERNO, ITALY. IROE, FLORENCE, ITALY. UNIV TURIN, IST FIS SPERIMENTALE, I-10124 TURIN, ITALY. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO 158, JAPAN. UNIV BOLOGNA, I-40126 BOLOGNA, ITALY. UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA. UNIV TOKYO, INST NUCL STUDY, TOKYO 113, JAPAN. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN 21, GERMANY. MCGILL UNIV, DEPT PHYS, MONTREAL H3A 2T5, QUEBEC, CANADA. UNIV MANITOBA, DEPT PHYS, WINNIPEG R3T 2N2, MANITOBA, CANADA. FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH 1, GERMANY. INFN BOLOGNA, BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA. UNIV BRISTOL, BRISTOL BS8 1TH, AVON, ENGLAND. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. UNIV HAMBURG, INST EXPL PHYS 2, W-2000 HAMBURG 13, GERMANY. UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND. INFN, COSENZA, ITALY. UNIV HAMBURG, INST EXPTL PHYS 1, W-2000 HAMBURG 13, GERMANY. NIKHEF, AMSTERDAM, NETHERLANDS. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV FREIBURG, INST PHYS, W-7800 FREIBURG, GERMANY. UNIV CALABRIA, DEPT PHYS, COSENZA, ITALY. MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW, RUSSIA. COLUMBIA UNIV, NEVIS LABS, IRVINGTON HUDSON, NY USA. UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY. INST NUCL PHYS, PL-31342 KRAKOW, POLAND. INFN, PADUA, ITALY. LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA. STANISLAW STASZIC UNIV MIN & MET, FAC PHYS & NUCL TECH, PL-30059 KRAKOW, POLAND. UNIV AUTONOMA MADRID, IST FIS TEOR, MADRID 34, SPAIN. INFN, FLORENCE, ITALY. DESY, W-2000 HAMBURG 52, GERMANY. JAGIELLONIAN UNIV, DEPT PHYS, PL-31007 KRAKOW, POLAND. INFN, ROME, ITALY. PENN STATE UNIV, DEPT PHYS, UNIV PK, PA 16802 USA. UNIV FLORENCE, I-50121 FLORENCE, ITALY. DESY, INST HOCHENERGIEPHYS, ZEUTHEN, GERMANY. INFN, LAB NAZL FRASCATI, FRASCATI, ITALY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, HIGH ENERGY NUCL PHYS GRP, LONDON SW7 2AZ, ENGLAND. UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. RP DERRICK, M (reprint author), ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RI De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Guida, MIchele/J-4714-2012; Wiggers, Leo/B-5218-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Frasconi, Franco/K-1068-2016; Weihs, Wolfgang/E-8005-2017 OI De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Guida, MIchele/0000-0002-1108-5391; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Frasconi, Franco/0000-0003-4204-6587; Weihs, Wolfgang/0000-0003-0884-0947 NR 37 TC 22 Z9 22 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 27 PY 1993 VL 306 IS 1-2 BP 158 EP 172 DI 10.1016/0370-2693(93)91154-F PG 15 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LD884 UT WOS:A1993LD88400027 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DABBOUS, H DESCH, K DIEKMANN, B DOEKER, T GEERTS, M GEITZ, G GUTJAHR, B HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FAWCETT, HF FOSTER, B GILMORE, R HEATH, GP LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS RAU, RR ARNEODO, M BARILLARI, T SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L BEDNAREK, B BORZEMSKI, P ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK I GLASER, R GOTTLICHER, P HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOTZ, U KOWALSKI, H KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D PARK, IH POSNECKER, KU ROHDE, M ROLDAN, J ROS, E SCHNEEKLOTH, U SCHROEDER, J SCHULZ, W SELONKE, F STILIARIS, E TSCHESLOG, E TSURUGAI, T TURKOT, F VOGEL, W WOLF, G YOUNGMAN, C GRABOSCH, HJ LEICH, A MEYER, A RETHFELDT, C SCHLENSTEDT, S BARBAGLI, G FRANCESCATO, A NUTI, M PELFER, P ANZIVINO, G CASACCIA, R DEPASQUALE, S QIAN, S VOTANO, L BAMBERGER, A FREIDHOF, A POSER, T SOLDNERREMBOLD, S THEISEN, G TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT FORBES Jr JAMIESON, VA RAINE, C SAXON, DH BRUCKMANN, H GLOTH, G HOLM, U KAMMERLOCHER, H KREBS, B NEUMANN, T WICK, K FURTJES, A KROGER, W LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SEIDMAN, A SCHOTT, W TERRON, J WIIK, BH ZETSCHE, F BACON, TC BUTTERWORTH I MARKOU, C MCQUILLAN, D MILLER, DB MOBAYYEN, MM PRINIAS, A VORVOLAKOS, A BIENZ, T KREUTZMANN, H MALLIK, U MCCLIMENT, E ROCO, M WANG, MZ CLOTH, P FILGES, D CHEN, L IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W BARREIRO, F CASES, G HERVAS, L LABARGA, L DELPESO, J DETROCONIZ, JF IKRAIAM, F MAYER, JK SMITH, GR CORRIVEAU, F GILKINSON, DJ HANNA, DS HARTMANN, J HUNG, LW LIM, JN DREES, RM MITCHELL, JW PATEL, PM SINCLAIR, LE STAIRS, DG ULLMANN, R BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KUZMIN, VA KUZNETSOV, EN SAVIN, AA VORONIN, AG ZOTOV, NP BENTVELSEN, S BOTJE, M DAKE, A ENGELEN, J DEJONG, P DEKAMPS, M KOOIJMAN, P KRUSE, A VANDERLUGT, H ODELL V TENNER, A TIECKE, H UIJTERWAAL, H VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R YOSHIDA, R BYLSMA, B DURKIN, LS HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN PARK, SK ROMANOWSKI, TA SEIDLEIN, R BLAIR, GA BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE GINGRICH, DM HALLAMBAKER, PM HARNEW, N KHATRI, T LONG, KR LUFFMAN, P MCARTHUR I MORAWITZ, P NASH, J SMITH, SJP ROOCROFT, NC WILSON, FF ABBIENDI, G BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U GASPARINI, F LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BUTTERWORTH, JM BULMAHN, J FEILD, G OH, BY WHITMORE, J CONTINO, U DAGOSTINI, G GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A BADURA, E BILTZINGER, J CHAVES, H ROST, M SEIFERT, RJ WALENTA, AH WEIHS, W ZECH, G DAGAN, S LEVY, A ZERZION, D HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K GIBAUT, DB KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y AF DERRICK, M KRAKAUER, D MAGILL, S MUSGRAVE, B REPOND, J REPOND, S STANEK, R TALAGA, RL THRON, J ARZARELLO, F AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, GC CASTELLINI, G CHIARINI, M CIFARELLI, L CINDOLO, F CIRALLI, F CONTIN, A DAURIA, S DELPAPA, C FRASCONI, F GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G LIN, Q LISOWSKI, B MACCARRONE, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A CRITTENDEN, J DABBOUS, H DESCH, K DIEKMANN, B DOEKER, T GEERTS, M GEITZ, G GUTJAHR, B HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, HP KRAMARCZYK, S KUCKES, M MASS, A MENGEL, S MOLLEN, J MONALDI, D MUSCH, H PAUL, E SCHATTEVOY, R SCHNEIDER, JL WEDEMEYER, R CASSIDY, A CUSSANS, DG DYCE, N FAWCETT, HF FOSTER, B GILMORE, R HEATH, GP LANCASTER, M LLEWELLYN, TJ MALOS, J MORGADO, CJS TAPPER, RJ WILSON, SS RAU, RR ARNEODO, M BARILLARI, T SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A GIALAS, I PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S CHWASTOWSKI, J DWURAZNY, A ESKREYS, A JAKUBOWSKI, Z NIZIOL, B PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L BEDNAREK, B BORZEMSKI, P ESKREYS, K JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KEDZIERSKI, T KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BIENLEIN, JK COLDEWEY, C DANNEMANN, A DREWS, G ERHARD, P FLASINSKI, M FLECK, I GLASER, R GOTTLICHER, P HAAS, T HAGGE, L HAIN, W HASELL, D HULTSCHIG, H JAHNEN, G JOOS, P KASEMANN, M KLANNER, R KOCH, W KOTZ, U KOWALSKI, H KRUGER, J LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MOMAYEZI, M NG, JST NICKEL, S NOTZ, D PARK, IH POSNECKER, KU ROHDE, M 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MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A BADURA, E BILTZINGER, J CHAVES, H ROST, M SEIFERT, RJ WALENTA, AH WEIHS, W ZECH, G DAGAN, S LEVY, A ZERZION, D HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K GIBAUT, DB KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI SEARCH FOR LEPTOQUARKS WITH THE ZEUS DETECTOR SO PHYSICS LETTERS B LA English DT Article ID COLLISIONS AB A search for any resonant state coupled to an electron and a proton constituent has been performed using collisions of electron and proton beams at HERA. In a sample with integrated luminosity of 26 nb-1, no evidence has been found for production of leptoquarks with decays to e- + jet or v + jet. Limits on the coupling strength of scalar leptoquarks to electron and quark have been determined for masses above 25 GeV. For example, scalar isosinglet leptoquarks (S0) with electroweak coupling strength to (e- u) states are ruled out at the 95% confidence level for masses below 168 GeV for left-handed couplings and below 176 GeV for right-handed couplings. C1 UNIV BOLOGNA, I-40126 BOLOGNA, ITALY. INFN, BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. UNIV CALABRIA, DEPT PHYS, COSENZA, ITALY. INFN, COSENZA, ITALY. COLUMBIA UNIV, NEVIS LAB, IRVINGTON HUDSON, NY USA. INST NUCL PHYS, PL-31342 KRAKOW, POLAND. STANISLAW STASZIC UNIV MIN & MET, FAC PHYS & TECH, PL-30059 KRAKOW, POLAND. JAGIELLONIAN UNIV, DEPT PHYS, PL-31007 KRAKOW, POLAND. 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OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND. UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY. INFN, PADUA, ITALY. PENN STATE UNIV, DEPT PHYS, UNIV PK, PA 16802 USA. UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. INFN, ROME, ITALY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA. UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN 21, GERMANY. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV TOKYO, INST NUCL STUDY, TOKYO 113, JAPAN. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO 158, JAPAN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10124 TURIN, ITALY. INFN, TURIN, ITALY. UNIV TORINO, FAC SCI, ALESSANDRIA, ITALY. UNIV TORONTO, DEPT PHYS, TORONTO M5S 1A1, ONTARIO, CANADA. UNIV LONDON UNIV COLL, DEPT PHYS & ASTRON, LONDON NW1 2HE, ENGLAND. VIRGINIA POLYTECH INST & STATE UNIV, DEPT PHYS, BLACKSBURG, VA 24061 USA. 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RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYBEN, O SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYBEN, O SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI SEARCH FOR A Z' AT THE Z RESONANCE SO PHYSICS LETTERS B LA English DT Article ID FERMION PAIR PRODUCTION; GRAND UNIFIED THEORIES; QED CORRECTIONS; E6; BOSON; MASS AB The search for an additional heavy gauge boson Z' is described. The models considered are based on either a superstring-motivated E6 or on a left-right symmetry and assume a minimal Higgs sector. Cross sections and asymmetries measured with the L3 detector in the vicinity of the Z resonance during the 1990 and 1991 running periods are used to determine limits on the Z-Z' gauge boson mixing angle and on the Z' mass. For Z' masses above the direct limits, we obtain the following allowed ranges of the mixing angle, theta(M), at the 95% confidence level: -0.004 less-than-or-equal-to theta(M) less-than-or-equal-to 0.015 for the chi model, -0.003 less-than-or-equal-to theta(M) less-than-or-equal-to 0.020 for the psi model, -0.029 less-than-or-equal-to theta(M) less-than-or-equal-to 0.010 for the eta model, -0.002 less-than-or-equal-to theta(M) less-than-or-equal-to 0.015 for the LR model. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. CNRS, IN2P3, LAPP, ANNECY LE VIEUX PHYS PARTICLES LAB, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. MIT, CAMBRIDGE, MA 02139 USA. INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. FBLJA PROJECT, WORLD LAB, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. UNIV LAUSANNE, CH-1000 LAUSANNE 17, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. INFN, SEZ MILANO, I-20133 MILAN, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW, RUSSIA. INFN, SEZ NAPLES, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80138 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. INFN, SEZ PERUGIA, PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, SEZ ROME, ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35401 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLAGEN, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RI van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Roth, Stefan/J-2757-2016; Tsaregorodtsev, Andrei/E-3873-2016; Fiandrini, Emanuele/C-4549-2008; Berdugo, Javier/A-2858-2015; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014 OI Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Berdugo, Javier/0000-0002-7911-8532; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731 NR 29 TC 35 Z9 35 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD MAY 27 PY 1993 VL 306 IS 1-2 BP 187 EP 196 DI 10.1016/0370-2693(93)91156-H PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LD884 UT WOS:A1993LD88400029 ER PT J AU WOO, LK HAYS, JA AF WOO, LK HAYS, JA TI INTERMETAL OXYGEN, SULFUR, AND SELENIUM ATOM TRANSFER-REACTIONS INVOLVING TITANIUM PORPHYRIN COMPLEXES SO INORGANIC CHEMISTRY LA English DT Note ID FERRYL FEO2+ COMPLEXES; PEROXOTITANIUM(IV) PORPHYRINS; IRON(III) PORPHYRINS; CHROMIUM(III) PORPHYRINS; MANGANESE PORPHYRINS; AQUEOUS-SOLUTION; DIOXYGEN; REDUCTION; MECHANISM; ADDUCTS AB The reaction of (octaethylporphyrinato)titanium(IV) perchalcogenido complexes (OEP)Ti(eta2-X2) (X = O. S. Se) with (tetratolylporphyrinato)titanium(II) acetylene complexes (TTP)Ti(eta-PhC=CPh) or (TTP)Ti(eta2-EtC=CEt) in C6D6 results in oxygen, sulfur, or selenium atom transfer processes which produce (TTP)Ti=X and (OEP)Ti=X. These reactions are formally two-electron processes in which X-X bond cleavage has occurred and eta2-X2(2-) is reduced to 2 X2 and Ti(II) is oxidized to Ti(IV). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP WOO, LK (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 39 TC 21 Z9 21 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 26 PY 1993 VL 32 IS 11 BP 2228 EP 2229 DI 10.1021/ic00063a002 PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LE489 UT WOS:A1993LE48900002 ER PT J AU ALBINATI, A ECKERT, J HOFMANN, P RUEGGER, H VENANZI, LM AF ALBINATI, A ECKERT, J HOFMANN, P RUEGGER, H VENANZI, LM TI THEORETICAL AND SPECTROSCOPIC STUDIES OF TETRAHEDRAL CLUSTERS OF THE TYPE [L3M(MU-H)X(AUL')3]2+ (M = RH, IR, X = 2, M = RU, X = 3) SO INORGANIC CHEMISTRY LA English DT Article ID MOLECULAR-ORBITAL ANALYSIS; GOLD CLUSTER; AU-197 MOSSBAUER; STRUCTURAL CHARACTERIZATION; HYDRIDE COMPLEXES; PHOSPHINE; HYDROGEN AB The structural and bonding aspects of the hydride ligands in the cationic clusters [(triphos)MH2{Au(PPh3)}3]2+ (triphos = CH3C(CH2PPh2)3; M = Rh and Ir) and [(triphos)RuH3{Au(PPh3)}3]2+ were investigated by a variety of techniques. The P-31-CP-MAS spectra (162 MHz) of the clusters [(triphos)MH2{Au(PPh3)}3](CF3SO3)2 (M = Rh and Ir), [(triphos)RuH3{Au(PPh3)}3][PF6]2, and [(triphos)RuH2{Au(PPh3)}3][PF6] show that in the dihydrido complexes the phosphorus atoms of the triphos ligands, as well as those of the PPh3 molecules, are inequivalent while the corresponding donors in the trihydrido complex are equivalent. The Au-197 Mossbauer spectra of the rhodium and iridium complexes show that two of the gold atoms in the dihydrido clusters are different from the third. Furthermore, the values of the isomer shifts and quadrupole splittings indicate that the bridging hydride ligands are best described as being intermediate between mu2 and mu3 (quasi-mu3). Incoherent inelastic neutron spectroscopic (IINS) and IR studies of the rhodium and ruthenium clusters were carried out to unambiguously assign the M-H vibrational modes. These spectra show bands at ca. 1600 cm-1 (assigned to nu(as)(M-H-Au) that exclude a pure mu3 bridging mode for the hydride ligands but are consistent with a quasi-mu3 model. Finally MO model calculations of the extended Huckel type for [(PH3)3Rh(AuPH3)3](H)33+, [(PH3)3Rh(AuPH3)3](H)22+, and [(PH3)3Rh(AuPH3)3]-(H)+, which served as simplified models of real hydrido cluster cations, have been performed. A general bonding scheme is presented, analyzing electronic and molecular structures for this class of compounds, including the question of possible hydride locations, on the basis of a transparent fragment orbital (FMO) description and by means of various geometry optimization calculations. The theoretical results are in accord with spectroscopic data and allow their consistent interpretation. Thus, all these studies are in agreement with a quasi-mu3 structure for the hydride ligands in these clusters. C1 SWISS FED INST TECHNOL,ANORGAN CHEM LAB,CH-8092 ZURICH,SWITZERLAND. UNIV MILAN,IST CHIM FARMACEUT,I-20131 MILAN,ITALY. LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. TECH UNIV MUNICH,INST ANORGAN CHEM,W-8046 GARCHING,GERMANY. RI Hofmann, Peter/A-4852-2016; Albinati, Alberto/I-1262-2015 OI Hofmann, Peter/0000-0003-2568-4608; Albinati, Alberto/0000-0002-8779-3327 NR 63 TC 19 Z9 19 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 26 PY 1993 VL 32 IS 11 BP 2377 EP 2390 DI 10.1021/ic00063a029 PG 14 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LE489 UT WOS:A1993LE48900029 ER PT J AU HUBINGER, S HALL, JH PURCELL, WL AF HUBINGER, S HALL, JH PURCELL, WL TI N-15 NMR-STUDIES OF TETRAZOLE COMPLEXES OF PENTAAMMINECOBALT(III) - IMPLICATIONS CONCERNING THE TRANSITION-STATE FOR LINKAGE ISOMERIZATION SO INORGANIC CHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; KINETICS; HYDROLYSIS AB Synthesis of the N1-bonded (5-methyltetrazolato)pentaamminecobalt(III) complex utilizing sodium azide enriched in N-15 at the terminal nitrogen has produced a complex enriched specifically at the N2 and N4 ring positions. This has permitted the assignment of all four nitrogen signals in the natural-abundance N-15 NMR spectrum of the complex. A similar natural-abundance NMR spectrum for a novel chelated amidine complex which is also N1 bonded is reported along with its synthesis and purification. Following the N-15 NMR of the linkage isomerization of the enriched complex in solution to the N2-bonded form has also permitted an eta5 and certain eta3 transition-state structures to be eliminated from consideration for the isomerization process. The data suggest an eta2 transition state is utilized. A subsequent N2-to-N3 isomerization of the N2-bonded complex has also been discovered from the N-15 NMR study. The enrichment study also indicates that previous assignments of ring nitrogen signals N1 and N4 in similar N2-bonded tetrazolato complexes of cobalt(III) may be in error. C1 UNIV MIAMI,DEPT CHEM,CORAL GABLES,FL 33124. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 21 TC 15 Z9 15 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 26 PY 1993 VL 32 IS 11 BP 2394 EP 2398 DI 10.1021/ic00063a031 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LE489 UT WOS:A1993LE48900031 ER PT J AU WITTE, JJ AF WITTE, JJ TI UPDATE - INVESTIGATIONS OF PERSONS TREATED BY HIV-INFECTED HEALTH-CARE WORKERS - UNITED-STATES (REPRINTED FROM MMWR, VOL 42, PG 329-331, 1993) SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Reprint C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. CDC,NATL CTR INFECT DIS,DIV HIV AIDS,ATLANTA,GA. CDC,NATL CTR INFECT DIS,HOSP INFECT PROGRAM,ATLANTA,GA. CDC,NATL CTR PREVENT SERV,DIV ORAL HLTH,ATLANTA,GA. CDC,NATL INST OCCUPAT SAFETY & HLTH,ATLANTA,GA. RP WITTE, JJ (reprint author), FLORIDA DEPT HLTH & REHABIL SERV,TALLAHASSEE,FL 32301, USA. NR 12 TC 0 Z9 0 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 MAY 26 PY 1993 VL 269 IS 20 BP 2622 EP 2623 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA LC865 UT WOS:A1993LC86500011 ER PT J AU KHARBANDA, S HUBERMAN, E KUFE, D AF KHARBANDA, S HUBERMAN, E KUFE, D TI ACTIVATION OF THE JUN-D GENE DURING TREATMENT OF HUMAN MYELOID-LEUKEMIA CELLS WITH 1-BETA-D-ARABINOFURANOSYLCYTOSINE SO BIOCHEMICAL PHARMACOLOGY LA English DT Article ID PROTEIN-KINASE-C; TRANSCRIPTION FACTOR AP-1; DNA-BINDING PROTEIN; CYCLIC-AMP; MONOCYTIC DIFFERENTIATION; B GENE; ARA-C; EXPRESSION; ONCOGENE; FOS AB The jun-D gene is a member of the c-jun family of early response genes that code for DNA binding proteins. The present studies demonstrate that 1-beta-D-arabinofuranosylcytosine (ara-C) increases jun-D expression in HL-525 myeloid leukemia cells. This induction by ara-C was maximal at 6 hr and transient. In contrast, ara-C had no detectable effect on the gene coding for the cAMP-responsive element binding protein 1. Nuclear run-on assays demonstrated that ara-C treatment is associated with an increased rate of jun-D transcription. The results also show that jun-D transcripts are stabilized at a posttranscriptional level in ara-C-treated cells. Taken together, these results demonstrate that ara-C induces expression of the jun-D gene and that this effect is regulated by transcriptional and posttranscriptional mechanisms. C1 HARVARD UNIV,SCH MED,DANA FARBER CANC INST,CLIN PHARMACOL LAB,BOSTON,MA 02115. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60347. UNIV CHICAGO,DEPT MOLEC GENET & CELL BIOL,CHICAGO,IL 60637. FU NCI NIH HHS [CA29431, CA42802] NR 42 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0006-2952 J9 BIOCHEM PHARMACOL JI Biochem. Pharmacol. PD MAY 25 PY 1993 VL 45 IS 10 BP 2055 EP 2061 DI 10.1016/0006-2952(93)90016-P PG 7 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA LF228 UT WOS:A1993LF22800016 PM 8512587 ER PT J AU OH, BH PANDIT, J KANG, CH NIKAIDO, K GOKCEN, S AMES, GFL KIM, SH AF OH, BH PANDIT, J KANG, CH NIKAIDO, K GOKCEN, S AMES, GFL KIM, SH TI 3-DIMENSIONAL STRUCTURES OF THE PERIPLASMIC LYSINE ARGININE ORNITHINE-BINDING PROTEIN WITH AND WITHOUT A LIGAND SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID SALMONELLA-TYPHIMURIUM; ESCHERICHIA-COLI; RESOLUTION STRUCTURE; HISTIDINE PERMEASE; ACTIVE-TRANSPORT; X-RAY; COMPLEX; SYSTEM; CRYSTALLIZATION; CHEMOTAXIS AB Many proteins exhibit a large-scale movement of rigid globular domains. Among these, bacterial periplasmic binding proteins involved in substrate transport, or transport and chemotaxis, can be used as prototypes for understanding the mechanism of the movement. Such movements have been found to be associated with specific functions, such as substrate binding, catalysis, and recognition by other biomolecules. We have determined the three-dimensional structures of the lysine/arginine/ornithine-binding protein (LAO) from Salmonella typhimurium with and without lysine by x-ray crystallographic methods at 1.8- and 1.9-angstrom resolution, respectively. The structures are composed of two lobes held together by two short connecting strands. The two lobes are far apart in the unliganded structure, but in contact with each other in the lysine-liganded structure. The large movement of the lobes is a consequence of a 52-degrees rotation of a single backbone torsion angle in the first connecting strand and of distributed smaller changes of three backbone torsion angles of the second connecting strand. The absence of contact between the lysine and the connecting strands suggests that the ligand does not induce the conformational change directly. We instead propose that the unliganded protein undergoes a dynamic change between an ''open'' and a ''closed'' conformation and that the role of the ligand is to stabilize the closed conformation. We discuss the nature of a surface area which might be recognized by the membrane-bound complex of these amino acids transport systems. C1 LAWRENCE BERKELEY LAB, DEPT CHEM & STRUCT BIOL, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MOLEC & CELL BIOL, BERKELEY, CA 94720 USA. RI Oh, Byung-Ha/C-2061-2011 FU NIAID NIH HHS [AI30725]; NIDDK NIH HHS [DK12121, DK43747] NR 39 TC 252 Z9 255 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 EI 1083-351X J9 J BIOL CHEM JI J. Biol. Chem. PD MAY 25 PY 1993 VL 268 IS 15 BP 11348 EP 11355 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LD466 UT WOS:A1993LD46600092 PM 8496186 ER PT J AU MINNICK, MF STIEGLER, GL AF MINNICK, MF STIEGLER, GL TI NUCLEOTIDE-SEQUENCE AND COMPARISON OF THE 5S RIBOSOMAL-RNA GENES OF ROCHALIMAEA-HENSELAE, R-QUINTANA AND BRUCELLA-ABORTUS SO NUCLEIC ACIDS RESEARCH LA English DT Note C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP MINNICK, MF (reprint author), UNIV MONTANA, DIV BIOL SCI, MISSOULA, MT 59812 USA. NR 5 TC 7 Z9 7 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 MAY 25 PY 1993 VL 21 IS 10 BP 2518 EP 2518 DI 10.1093/nar/21.10.2518 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LF503 UT WOS:A1993LF50300040 PM 7685083 ER PT J AU YANG, H PINIZZOTTO, RF LUO, L NAMAVAR, F AF YANG, H PINIZZOTTO, RF LUO, L NAMAVAR, F TI MICROSTRUCTURAL ANALYSIS OF NICKEL SILICIDE FORMED BY NICKEL SILICON-ON-OXIDE ANNEALING SO APPLIED PHYSICS LETTERS LA English DT Article ID INTERFACES AB Microstructures of crystalline nickel disilicide thin films formed on SIMOX (separation by implantation of oxygen) Si-on-oxide substrates were analyzed using electron microscopy. The samples were examined both in the top-down plane-view orientation and in cross section along a [110] direction. The nickel silicide films were formed through thermal reaction of metallic nickel deposited on the top Si layer of the SIMOX substrates. The results were compared with epitaxial NiSi2 layers grown on single crystal silicon substrates. Twin boundaries were observed at the silicide/oxide interface. The oxide layer acts as a diffusion barrier which prevents nickel from diffusing into the substrate resulting in uniform NiSi2 on a SiO2/Si substrate. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. SPIRE CORP,BEDFORD,MA 01730. RP YANG, H (reprint author), UNIV N TEXAS,CTR MAT CHARACTERIZAT,DENTON,TX 76203, USA. NR 8 TC 7 Z9 7 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 24 PY 1993 VL 62 IS 21 BP 2694 EP 2696 DI 10.1063/1.109234 PG 3 WC Physics, Applied SC Physics GA LD123 UT WOS:A1993LD12300033 ER PT J AU MAIENSCHEIN, JL BOWERS, JS BEITER, TA CANTRELL, JS AF MAIENSCHEIN, JL BOWERS, JS BEITER, TA CANTRELL, JS TI REACTIONS OF LITHIUM HYDRIDE AND BERYLLIUM HYDRIDE - THERMAL STUDIES AND IDENTIFICATION OF PRODUCTS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID LIH AB Using simultaneous differential thermal analysis and thermogravimetric analysis, and powder X-ray diffraction, we determined that the reactions of lithium hydride and beryllium hydride follow the pathway LiH + BeH2 --> 500 K LiBeH3 --> 590 K 1/2Li2BeH4 + 1/2Be + 1/2H2 up for reaction mixtures containing less than 66.6 mol.% LiH, and 2LiH + BeH2 --> 500 K Li2BeH4 for reaction mixtures containing 66.6 mol.% LiH or more. LiBeH3 undergoes fusion at 430 K Li2BeH4 has two thermal transitions at 550 K and 660 K; the first may be intramolecular rearrangement and the second may be fusion. The two products are indistinguishable by powder X-ray diffraction. C1 MIAMI UNIV,DEPT CHEM,OXFORD,OH 45056. RP MAIENSCHEIN, JL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-282,LIVERMORE,CA 94550, USA. NR 15 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD MAY 24 PY 1993 VL 196 IS 1-2 BP 1 EP 5 DI 10.1016/0925-8388(93)90561-Z PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA LG344 UT WOS:A1993LG34400007 ER PT J AU CURRO, JG YETHIRAJ, A SCHWEIZER, KS MCCOY, JD HONNELL, KG AF CURRO, JG YETHIRAJ, A SCHWEIZER, KS MCCOY, JD HONNELL, KG TI MICROSCOPIC EQUATIONS-OF-STATE FOR HYDROCARBON FLUIDS - EFFECT OF ATTRACTIONS AND COMPARISON WITH POLYETHYLENE EXPERIMENTS SO MACROMOLECULES LA English DT Article ID MONTE-CARLO SIMULATIONS; SQUARE-WELL CHAINS; INTEGRAL-EQUATION; POLYMER MELTS; PERTURBATION-THEORY; MOLECULAR LIQUIDS; LOCAL-STRUCTURE; BULK EQUATION; BLENDS; THERMODYNAMICS AB Microscopic equations-of-state are developed for n-alkanes and polyethylene based on the polymer reference interaction site model (PRISM) integral equation theory and a generalized Flory approach. The molecules are modeled as a series of overlapping spheres (methylene groups) with constant bond length and bond angles; internal rotations are accounted for by the rotational isomeric state approximation. The interaction between sites on different molecules is taken to be of the Lennard-Jones form. The thermodynamic properties of the fluid are obtained via standard perturbation theory in which the potential is divided into a repulsive reference system and an attractive perturbation. The reference system is approximated by a hard-core repulsion in which the hard-sphere diameter d(T) is estimated for polyethylene from wide-angle X-ray scattering experiments. The PRISM theory is used to calculate the hard-sphere chain contribution to the equation-of-state by three different thermodynamic routes: (1) integrating the compressibility, (2) evaluating the density profile at a hard wall, and (3) using a hard-sphere 'charging'' method analogous to the virial approach in monatomic liquids. The generalized Flory dimer (GFD) theory is used to obtain a fourth equation-of-state for the hard-sphere chains. The attractive perturbation is treated with first-order perturbation theory, making use of the radial distribution function g0(r) of the reference system. The various equations-of-state presented differ in the route to the hard-chain pressure; PRISM is used in all cases to treat the attractions. Excellent agreement for the equation-of-state is found between the hybrid GFD/PRISM calculations and molecular dynamics simulations of n-butane and experimental pressure-volume-temperature (PVT) measurements on polyethylene melts. The compressibility and charging routes predict pressures which are too low and too high, respectively, for polyethylene. The wall route yields pressures in good agreement at experimental densities but predicts a melt which is too compressible. C1 UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. PHILLIPS PETR CO,BARTLESVILLE,OK 74006. NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801. RP CURRO, JG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI McCoy, John/B-3846-2010 OI McCoy, John/0000-0001-5404-1404 NR 63 TC 32 Z9 32 U1 4 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 24 PY 1993 VL 26 IS 11 BP 2655 EP 2662 DI 10.1021/ma00063a002 PG 8 WC Polymer Science SC Polymer Science GA LD860 UT WOS:A1993LD86000002 ER PT J AU ADOLF, D HANCE, B MARTIN, JE AF ADOLF, D HANCE, B MARTIN, JE TI REMNANT PERCOLATIVE DISORDER IN HIGHLY-CURED NETWORKS SO MACROMOLECULES LA English DT Article ID SOL-GEL TRANSITION; RESTRICTED VALENCE; VISCOELASTICITY; THRESHOLD; GELATION; CLUSTERS AB We have previously reported viscoelastic measurements demonstrating that fully-cured networks and critical gels exhibit similar relaxation spectra, implying that fully-cured networks are somewhat ill-connected. Here, we present restricted valence percolation simulations of networks well beyond the percolation transition that explicitly display remnant disorder over length scales less than the correlation length of the network. We conclude that the topology of highly-cured networks is not well described by a regular three-dimensional ''tennis net'' but is ill-connected over length scales that correspond to relaxation modes of practical interest. C1 SANDIA NATL LABS,DEPT ADV MAT PHYS,ALBUQUERQUE,NM 87185. RP ADOLF, D (reprint author), SANDIA NATL LABS,DEPT PROPERTIES ORGAN MAT,ALBUQUERQUE,NM 87185, USA. NR 15 TC 9 Z9 9 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 24 PY 1993 VL 26 IS 11 BP 2754 EP 2758 DI 10.1021/ma00063a018 PG 5 WC Polymer Science SC Polymer Science GA LD860 UT WOS:A1993LD86000018 ER PT J AU GRONBECHJENSEN, N KIVSHAR, YS SALERNO, M AF GRONBECHJENSEN, N KIVSHAR, YS SALERNO, M TI SOLITONS ON OSCILLATING AND ROTATING BACKGROUNDS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINE-GORDON SYSTEM; PHASE-LOCKING; JUNCTIONS; DRIVEN; EXCITATIONS; DYNAMICS AB We show that kink solitons may exist on top of a rotating background as localized objects if the background dynamics is phase locked to a rapidly oscillating ac force. The result is demonstrated analytically for the sine-Gordon model, showing excellent agreement with numerical simulations. In the context of long Josephson junctions this phenomenon means that the well known Shapiro steps in the current-voltage characteristics change into a set of the zero-field steps according to the number of propagating fluxons. C1 STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. UNIV DUSSELDORF,INST THEORET PHYS 1,W-4000 DUSSELDORF 1,GERMANY. UNIV SALERNO,DEPT THEORET PHYS,I-84100 BARONISSI,ITALY. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Salerno, Mario/B-1732-2012 OI Salerno, Mario/0000-0002-1443-7858 NR 15 TC 10 Z9 10 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 MAY 24 PY 1993 VL 70 IS 21 BP 3181 EP 3185 DI 10.1103/PhysRevLett.70.3181 PG 5 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300001 ER PT J AU WARD, H JOHNSON, J JOHNSON, K GREENE, S GROF, Y MOORE, CF MORDECHAI, S MORRIS, CL ODONNELL, JM WHITLEY, C AF WARD, H JOHNSON, J JOHNSON, K GREENE, S GROF, Y MOORE, CF MORDECHAI, S MORRIS, CL ODONNELL, JM WHITLEY, C TI ENERGY-DEPENDENCE OF DOUBLE GIANT-RESONANCES IN PION DOUBLE CHARGE-EXCHANGE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ISOBARIC-ANALOG-STATE; DIPOLE RESONANCE; INELASTIC-SCATTERING; LIGHT-NUCLEI; TRANSITIONS; C-12 AB The energy dependence of the giant dipole resonance built on the isobaric analog state was measured in pion-induced double charge exchange on C-13 at incident pion energies of 140-295 MeV. The cross section increases with energy. The excitation function has a typical non-spin-flip signature, expected from simple considerations and verified by sequential model calculations. Three narrower previously reported low-lying states in O-13 (E(x) = 3.1, 4.5, and 6.1 MeV) exhibit a spin-flip signature and may correspond to the giant Gamow-Teller strength built on the isobaric analog state. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. BEN GURION UNIV NEGEV,IL-84105 BEER SHEVA,ISRAEL. UNIV TEXAS,AUSTIN,TX 78712. NR 23 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3209 EP 3212 DI 10.1103/PhysRevLett.70.3209 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300008 ER PT J AU FRY, ES LI, XF NIKONOV, D PADMABANDU, GG SCULLY, MO SMITH, AV TITTEL, FK WANG, C WILKINSON, SR ZHU, SY AF FRY, ES LI, XF NIKONOV, D PADMABANDU, GG SCULLY, MO SMITH, AV TITTEL, FK WANG, C WILKINSON, SR ZHU, SY TI ATOMIC COHERENCE EFFECTS WITHIN THE SODIUM D1 LINE - LASING WITHOUT INVERSION VIA POPULATION TRAPPING SO PHYSICAL REVIEW LETTERS LA English DT Article ID CORRELATED SPONTANEOUS-EMISSION; LASER; AMPLIFICATION; RESONANCES; INTERFERENCE AB Atomic coherence effects within the sodium D1 line are shown to lead to the suppression of optical pumping, to the switching of light on and off when the coherence effects are turned on and off, and especially to lasing without inversion. C1 UNIV NEW MEXICO, CTR ADV STUDY, ALBUQUERQUE, NM 87131 USA. UNIV NEW MEXICO, DEPT PHYS, ALBUQUERQUE, NM 87131 USA. MAX PLANCK INST QUANTUM OPT, W-8046 GARCHING, GERMANY. RICE UNIV, DEPT ELECT ENGN, HOUSTON, TX 77251 USA. SANDIA NATL LABS, DEPT 1128, ALBUQUERQUE, NM 87185 USA. TEXAS A&M UNIV SYST, DEPT PHYS, COLL STN, TX 77843 USA. RP HARC, TEXAS LASER LAB, 4800 RES FOREST DR, THE WOODLANDS, TX 77381 USA. RI Nikonov, Dmitri/B-6502-2011; Fry, Edward/B-6012-2016 OI Nikonov, Dmitri/0000-0002-1436-1267; NR 22 TC 240 Z9 248 U1 1 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3235 EP 3238 DI 10.1103/PhysRevLett.70.3235 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300015 ER PT J AU SHE, ZS CHEN, SY DOOLEN, G KRAICHNAN, RH ORSZAG, SA AF SHE, ZS CHEN, SY DOOLEN, G KRAICHNAN, RH ORSZAG, SA TI REYNOLDS-NUMBER DEPENDENCE OF ISOTROPIC NAVIER-STOKES TURBULENCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID NON-GAUSSIAN STATISTICS; HOMOGENEOUS TURBULENCE; NUMERICAL TURBULENCE; SCALE STRUCTURE; PHYSICAL MODEL; VELOCITY; INTERMITTENCY; SPECTRA; VORTEX AB Reynolds number dependence of turbulence energy spectra and higher-order moments of velocity differences is explored by numerical integrations of the incompressive Navier-Stokes equation. The simulations have spatial resolutions up to 512(3) and cover 15 less-than-or-equal-to R(lambda) less-than-or-equal-to 200, where R(lambda) is the Taylor microscale Reynolds number. The energy spectra collapse when scaled by the wave number k(p) of peak dissipation and also by the spectrum level at k(p). k(p) varies with R(lambda) in accord with the 1941 Kolmogorov theory. High-order normalized moments of velocity differences over inertial-range distances exhibit an R(lambda)-independent variation with separation distance. Implications of these observations are discussed. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. UNIV ARIZONA, DEPT MATH, TUCSON, AZ 85721 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. RP LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. RI Chen, Shiyi/A-3234-2010; 佘, 振苏/C-1447-2010; She, Zhen-Su/H-9722-2014 NR 24 TC 64 Z9 64 U1 1 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3251 EP 3254 DI 10.1103/PhysRevLett.70.3251 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300019 ER PT J AU WANG, Y FAULKNER, JS STOCKS, GM AF WANG, Y FAULKNER, JS STOCKS, GM TI STRUCTURE OF PALLADIUM-RHODIUM ALLOYS BELOW THEIR MELTING-POINTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID DENSITIES; STATES AB A new method for calculating the boundaries between two solid alloy phases has been developed. It is first principles in that the only input is the atomic numbers of the constituents, and differs from previous efforts in that no interaction potentials are introduced. It is used to calculate the miscibility gap in the palladium-rhodium phase diagram. C1 FLORIDA ATLANTIC UNIV,DEPT CHEM,BOCA RATON,FL 33431. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP WANG, Y (reprint author), FLORIDA ATLANTIC UNIV,ALLOY RES CTR,BOCA RATON,FL 33431, USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 18 TC 13 Z9 13 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3287 EP 3290 DI 10.1103/PhysRevLett.70.3287 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300028 ER PT J AU BIGOT, JY MYCEK, MA WEISS, S ULBRICH, RG CHEMLA, DS AF BIGOT, JY MYCEK, MA WEISS, S ULBRICH, RG CHEMLA, DS TI INSTANTANEOUS FREQUENCY DYNAMICS OF COHERENT WAVE MIXING IN SEMICONDUCTOR QUANTUM-WELLS SO PHYSICAL REVIEW LETTERS LA English DT Article AB Using a combination of interferometric-correlation and time-resolved intensity measurement techniques, we characterize the phase and amplitude of the coherent emission of semiconductor quantum wells resonantly excited by ultrashort optical pulses. We demonstrate that exciton-exciton interaction produces nonlinear phase shifts of the instantaneous frequency relative to the incident laser. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV GOTTINGEN, DEPT PHYS, W-3400 GOTTINGEN, GERMANY. INST PHYS & CHIM MAT STRASBOURG, OPT NONLINEAIRE & OPTOELECTR GRP, STRASBOURG, FRANCE. RP BIGOT, JY (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI weiss, shimon/B-4164-2009 OI weiss, shimon/0000-0002-0720-5426 NR 14 TC 75 Z9 75 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3307 EP 3310 DI 10.1103/PhysRevLett.70.3307 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300033 ER PT J AU NICHOLSON, DMC BROWN, RH AF NICHOLSON, DMC BROWN, RH TI ELECTRICAL-RESISTIVITY OF NI0.8MO0.2 - EXPLANATION OF ANOMALOUS BEHAVIOR IN SHORT-RANGE ORDERED ALLOYS SO PHYSICAL REVIEW LETTERS LA English DT Article ID COHERENT-POTENTIAL APPROXIMATION AB We explain the counterintuitive result that increased short-range order reduces the conductivity in Ni0.8Mo0.2 and suggest an explanation for the ''K-state'' effect, in which severe deformation can significantly increase conductivity. C1 LUTHER COLL,DEPT PHYS,DECORAH,IA 52101. RP NICHOLSON, DMC (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 23 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3311 EP 3314 DI 10.1103/PhysRevLett.70.3311 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300034 ER PT J AU ALP, EE MOONEY, TM TOELLNER, T STURHAHN, W WITTHOFF, E ROHLSBERGER, R GERDAU, E HOMMA, H KENTJANA, M AF ALP, EE MOONEY, TM TOELLNER, T STURHAHN, W WITTHOFF, E ROHLSBERGER, R GERDAU, E HOMMA, H KENTJANA, M TI TIME-RESOLVED NUCLEAR RESONANT SCATTERING FROM SN-119 NUCLEI USING SYNCHROTRON RADIATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID INCIDENCE ANTIREFLECTION FILMS; BRAGG-DIFFRACTION; REFLECTIONS AB Nuclear resonant scattering of synchrotron radiation from Sn-119 nuclei at 23.87 keV has been observed. The combination of a novel nested crystal monochromator and a (SnO2/Pd)-Sn-119 based grazing incidence antireflection film was used to investigate the Mossbauer parameters of a tin containing powder sample in a forward scattering experiment. C1 UNIV HAMBURG,INST EXPTL PHYS 2,W-2000 HAMBURG 50,GERMANY. CUNY BROOKLYN COLL,BROOKLYN,NY 11210. RP ALP, EE (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Rohlsberger, Ralf/J-4173-2013 OI Rohlsberger, Ralf/0000-0001-6005-5183 NR 22 TC 54 Z9 54 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 24 PY 1993 VL 70 IS 21 BP 3351 EP 3354 DI 10.1103/PhysRevLett.70.3351 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300044 ER PT J AU GLENN, LA AF GLENN, LA TI COMPARING UNITED-STATES AND RUSSIAN EXPERIENCE WITH CAVITY DECOUPLING IN SALT SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SALMON AB Recently released Russian data on two underground nuclear explosions in an Azgir salt dome allow comparison for the first time with similar U. S. explosions. In both cases, highly tamped explosions were employed to form cavities and, after a period of several years, much smaller explosions were then carried out in these same cavities. The seismic decoupling factor obtained from the Russian tests appears to be a factor of 4 less than is predicted, based on the U. S. experience. However, the Russian data are found to be entirely consistent with smaller scale U. S. experiments with chemical explosives. These results can be explained by the extent of damage in the immediate vicinity of the cavity walls, but it remains unclear why the damage should exist at the Russian site, and not at the U. S. RP GLENN, LA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,SHOCK PHYS GRP,POB 808,MS L-200,LIVERMORE,CA 94550, USA. NR 15 TC 4 Z9 4 U1 1 U2 3 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 MAY 21 PY 1993 VL 20 IS 10 BP 919 EP 922 DI 10.1029/93GL00975 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LE448 UT WOS:A1993LE44800011 ER PT J AU BARNABAS, MV TRIFUNAC, AD AF BARNABAS, MV TRIFUNAC, AD TI RADICAL CATIONS OF QUADRICYCLANE AND NORBORNADIENE IN POLAR ZSM-5 MATRICES - THERMAL RETRO-DIELS-ALDER REACTION SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID ELECTRON-SPIN-RESONANCE; IRRADIATED FROZEN-SOLUTIONS; TRIPLET-STATE; OLEFINS; DIENES AB The radical cation of norbornadiene or quadricyclane (Q) and of norbornadiene (NBD) produced by gamma-radiolysis in polar ZSM-5 undergo a reverse Diels-Alder reaction, which is a thermally forbidden, photochemically allowed process, to cyclopentadiene radical cation. RP BARNABAS, MV (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 17 TC 9 Z9 9 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 MAY 21 PY 1993 IS 10 BP 813 EP 814 DI 10.1039/c39930000813 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LD668 UT WOS:A1993LD66800001 ER PT J AU ZHAO, YX ARNOLD, CC NEUMARK, DM AF ZHAO, YX ARNOLD, CC NEUMARK, DM TI STUDY OF THE I.CO2 VANDERWAALS COMPLEX BY THRESHOLD PHOTODETACHMENT SPECTROSCOPY OF I-CO2 SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP ON ORIENTATION AND POLARISATION EFFECTS IN CHEMICAL REACTION DYNAMICS CY NOV 20-25, 1992 CL ASSISI, ITALY SP NATO, UNIV PERUGIA, DIPT CHIM, CNR ID NOBLE-GAS HALIDES; CROSSED MOLECULAR-BEAM; INTERACTION POTENTIALS; EMISSION-SPECTRA; PHOTOELECTRON-SPECTROSCOPY; MICROWAVE SPECTROSCOPY; LASER ACTION; OH-AR; SYSTEMS; RESOLUTION AB Photodetachment of the I-CO2 anion accesses the three lowest-lying electronic states of the I . CO2 van der Waals complex. High-resolution threshold photodetachment (ZEKE) spectroscopy reveals progressions in the low-frequency C-I van der Waals stretch in each electronic state, providing a detailed spectroscopic probe of the interaction between a halogen atom and a closed-shell molecule. From our data, we construct one-dimensional potential-energy functions for each neutral state as well as for the anion, and these are compared to rare-gas-halogen and rare-gas-halide potentials. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94729. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 60 TC 49 Z9 49 U1 0 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD MAY 21 PY 1993 VL 89 IS 10 BP 1449 EP 1456 DI 10.1039/ft9938901449 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LD678 UT WOS:A1993LD67800007 ER PT J AU BENSADOUN, M BERSANELLI, M DEAMICI, G KOGUT, A LEVIN, SM LIMON, M SMOOT, GF WITEBSKY, C AF BENSADOUN, M BERSANELLI, M DEAMICI, G KOGUT, A LEVIN, SM LIMON, M SMOOT, GF WITEBSKY, C TI MEASUREMENTS OF THE COSMIC MICROWAVE BACKGROUND TEMPERATURE AT 1.47 GHZ SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS ID RADIATION TEMPERATURE; PRECISE MEASUREMENT; 1.32 MILLIMETERS; 3.8 GHZ; SPECTRUM; FREQUENCY; CN; CENTIMETERS; WAVELENGTH; UNIVERSE AB We have used a radio-frequency-gain total-power radiometer to measure the intensity of the cosmic microwave background (CMB) at a frequency of 1.47 GHz (20.4 cm wavelength) from White Mountain, California in 1988 September and from the South Pole, Antarctica in 1989 December. The CMB thermodynamic temperature, T(CMB), is 2.27 +/- 0.25 K (68% confidence limit) measured from White Mountain and 2.26 +/- 0.20 K from the South Pole site. The combined result is 2.26 +/- 0.19 K. The correction for Galactic emission has been derived from scaled low-frequency maps and constitutes the main source of error. The atmospheric signal is extrapolated from our zenith scan measurements at higher frequencies. These results are consistent with our previous measurement at 1.41 GHz (Levin et al. 1988) and approximately 2.5 sigma from the 2.74 +/- 0.01 K global average CMB temperature. C1 NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CNR,IST FIS COSM,I-20133 MILAN,ITALY. RP BENSADOUN, M (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,MS 50351,BERKELEY,CA 94720, USA. RI Kogut, Alan/D-6293-2012 NR 42 TC 30 Z9 30 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 20 PY 1993 VL 409 IS 1 BP 1 EP 13 DI 10.1086/172637 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LB038 UT WOS:A1993LB03800001 ER PT J AU SHLOSMAN, I VITELLO, P AF SHLOSMAN, I VITELLO, P TI WINDS FROM ACCRETION DISKS - ULTRAVIOLET LINE FORMATION IN CATACLYSMIC VARIABLES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION, ACCRETION DISKS; NOVAE, CATACLYSMIC VARIABLES; STARS, MASS LOSS ID X-RAY-EMISSION; RADIATION-DRIVEN WINDS; HIGH-VELOCITY WINDS; STELLAR WINDS; DWARF NOVA; IUE OBSERVATIONS; STARS; DYNAMICS; OUTBURST; CORONAE AB Winds from accretion disks in cataclysmic variable stars are ubiquitous. Observations by IUE reveal P Cygni-shaped profiles of high-ionization lines which are attributed to these winds. We have studied the formation of UV emission lines in cataclysmic variables by constructing kinematical models of biconical rotating outflows from disks around white dwarfs. The photoionization in the wind is calculated taking into account the radiation fields of the disk, the boundary layer, and the white dwarf. The three-dimensional radiative transfer is solved in the Sobolev approximation. Effects on the line shapes of varying basic physical parameters of the wind, such as accretion and mass-loss rates, temperature of the boundary layer, rotation, as well as inclination angle, are shown explicitly. We identify and map the resonant scattering regions in the wind which have strongly biconical character regardless of the asumed velocity and radiation fields. Rotation at the base of the wind introduces a radial shear which decreases the line optical depth and reduces the line core intensity. We find that it is possible to reproduce the observed P Cygni line shapes and make some predictions to be verified in high-resolution observations. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. RP SHLOSMAN, I (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 50 TC 60 Z9 60 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 MAY 20 PY 1993 VL 409 IS 1 BP 372 EP 386 DI 10.1086/172670 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LB038 UT WOS:A1993LB03800034 ER PT J AU MEINHOLD, P CLAPP, A DEVLIN, M FISCHER, M GUNDERSEN, J HOLMES, W LANGE, A LUBIN, P RICHARDS, P SMOOT, G AF MEINHOLD, P CLAPP, A DEVLIN, M FISCHER, M GUNDERSEN, J HOLMES, W LANGE, A LUBIN, P RICHARDS, P SMOOT, G TI MEASUREMENTS OF THE ANISOTROPY OF THE COSMIC BACKGROUND-RADIATION AT 0.5 SCALE NEAR THE STAR MU PEGASI SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; DARK MATTER; LARGE-SCALE STRUCTURE OF UNIVERSE ID MICROWAVE AB Results are presented from the third flight of the MAX experiment, an attitude-controlled balloon-borne millimeter-wave telescope with a 0.5-degrees beam, a 1-degrees chop, and a three-channel bolometric photometer. Several hours of high-quality data were obtained during a flight on 1991 June 5, including long integrations to search for CBR anisotropy, two separate measurements of dust in the Galactic plane, a brief scan of the Coma Cluster to search for the Sunyaev-Zel'dovich (SZ) effect, and a number of important systematic tests. Data from one of the long CBR integrations, carried out in a region of sky near the star Mu Pegasi, are presented. The primary structure in the data is shown to be emission from Galactic dust via its spectrum and correlation with the IRAS 100 mum map. Several approaches are used to fit this dust component and remove it from the data. An upper limit to CBR anisotropy of DELTAT/T < 2.5 x 10(-5) is obtained for a Gaussian autocorrelation function with coherence angle theta(c) = 25'. This limit is significantly higher than the measurement sensitivity of DELTAT/T almost-equal-to 1 x 10(-5) due to the presence of residual structure in the data after removal of the dust component. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT PHYS,BERKELEY,CA 94720. RP MEINHOLD, P (reprint author), UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106, USA. NR 12 TC 74 Z9 74 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 MAY 20 PY 1993 VL 409 IS 1 BP L1 EP L4 DI 10.1086/186845 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LB040 UT WOS:A1993LB04000001 ER PT J AU SCHOENTHALER, R CASTRO, JR PETTI, PL BAKENBROWN, K PHILLIPS, TL AF SCHOENTHALER, R CASTRO, JR PETTI, PL BAKENBROWN, K PHILLIPS, TL TI CHARGED-PARTICLE IRRADIATION OF SACRAL CHORDOMAS SO INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS LA English DT Note DE CHORDOMA; SACRUM; RADIATION; CHARGED PARTICLES; HELIUM; NEON; REIRRADIATION ID RADIATION-THERAPY AB Purpose: The purpose of this report is determine the impact of charged particle irradiation at Lawrence Berkeley Laboratory (LBL) in treating patients with sacral chordomas. Overall survival, local control, complications, and predictive parameters are analyzed. Methods and Materials: Fourteen patients with sacral chordomas were treated with the charged particles helium and neon between 1977 and 1989. The median dose was 7565 cGyE and the median follow up is 5 years. All patients were treated post-operatively; ten had gross residual disease. Results: Kaplan-Meier survival at 5 years is 85%. Overall 5-year local control is 55%. A trend to improved local control at 5 years was seen in patients treated with neon when compared to patients treated with helium (62% vs 34%), in patients following complete resection versus patients with gross residual tumor (75% vs 40%), and in patients who had treatment courses under 73 days (61% vs 21%). Distant metastases were seen in two patients (14%). No patient developed neurologic sequelae or pain syndromes. One previously irradiated patient required colostomy, one patient had delayed wound healing following a negative post-radiation biopsy, and one patient developed a second malignancy. There were no genitourinary complications. Conclusion: Our experience indicates that post-operative charged particle irradiation of sacral chordomas appears to result in reasonable local control and survival with acceptable risk, and that additional evaluation on the use of heavy charged particles is warranted. C1 LAWRENCE BERKELEY LAB,DEPT RADIAT ONCOL,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,MED CTR,DEPT RADIAT ONCOL,SAN FRANCISCO,CA 94143. FU NCI NIH HHS [CA19138] NR 25 TC 40 Z9 40 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-3016 J9 INT J RADIAT ONCOL JI Int. J. Radiat. Oncol. Biol. Phys. PD MAY 20 PY 1993 VL 26 IS 2 BP 291 EP 298 PG 8 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA LD716 UT WOS:A1993LD71600013 PM 8491686 ER PT J AU MCCLUSKEY, M FREI, H AF MCCLUSKEY, M FREI, H TI TRANSFER OF CH2 FROM KETENE TO NO BY PHOTOEXCITATION OF REACTANT PAIRS IN SOLID ARGON BELOW THE CH2=C=O DISSOCIATION LIMIT SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID FLUORESCENCE EXCITATION SPECTRUM; ROTATIONALLY COOLED NO2; CRYOGENIC MATRIX; ABINITIO; PHOTOFRAGMENTATION; REARRANGEMENT; THRESHOLD; CONSTANTS; ACETYLENE; STATES AB Chemical reaction has been observed upon excitation of ketene.NO pairs isolated in an argon matrix at 12 K with 380- and 355-nm laser radiation. The reaction product was identified as the iminoxy radical CH2=N-O by FT-IR spectroscopy. The CH2 group transfer occurs at excitation energies below the lowest dissociation barrier of ketene and constitutes the first example of a photochemical carbenoid reaction. C1 LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. NR 42 TC 10 Z9 10 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 20 PY 1993 VL 97 IS 20 BP 5204 EP 5207 DI 10.1021/j100122a004 PG 4 WC Chemistry, Physical SC Chemistry GA LD042 UT WOS:A1993LD04200004 ER PT J AU SIMON, M LEBRUN, T MARTINS, R DESOUZA, GGB NENNER, I LAVOLLEE, M MORIN, P AF SIMON, M LEBRUN, T MARTINS, R DESOUZA, GGB NENNER, I LAVOLLEE, M MORIN, P TI MULTICOINCIDENCE MASS-SPECTROMETRY APPLIED TO HEXAMETHYLDISILANE EXCITED AROUND THE SI 2P EDGE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PROCESSES FOLLOWING EXCITATION; RELAXATION PROCESSES; MOLECULES; IONIZATION; THRESHOLD; VICINITY; FRAGMENTATION; DISSOCIATION; RESONANCES; IONS AB Photoelectron-photoion-photoion coincidence (PEPIPICO) mass spectrometry is applied to Si 2p core ionization. The ion yield spectrum is compared to the spectrum of the tetramethylsilane molecule in order to point out resonances due to the Si-Si chemical bond. Simple coincidence mass spectra are dominated by the SiC3H9+ fragment ion and do not show a strong dependence on photon wavelength. PEPIPICO spectra demonstrate that dissociation dynamics is dominated by stepwise fragmentation of SiC3H9+ and that double ionization always involves Si-Si chemical bond rupture, shown to be faster than the Si-C rupture. We discuss the results in term of a fast decay of Si-Si into singly and doubly charged molecules followed by a cascade of slow fragmentation and isomerization Of SiC3H9+. C1 CENS,CEA,DRECAM,SPAM,F-91191 GIF SUR YVETTE,FRANCE. UFRJ,INST QUIM,BR-21910 RIO JANEIRO,BRAZIL. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP SIMON, M (reprint author), UNIV PARIS 11,LURE,BAT 209D,F-91405 ORSAY,FRANCE. RI Martins, Rosana/D-2279-2014 NR 31 TC 79 Z9 79 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 MAY 20 PY 1993 VL 97 IS 20 BP 5228 EP 5237 DI 10.1021/j100122a011 PG 10 WC Chemistry, Physical SC Chemistry GA LD042 UT WOS:A1993LD04200011 ER PT J AU ZAMFIR, NV CASTEN, RF AF ZAMFIR, NV CASTEN, RF TI A NEW SIGNATURE FOR SHAPE TRANSITIONAL REGIONS SO PHYSICS LETTERS B LA English DT Article ID EVEN AB The 2-tracked empirical correlation between B(E2; 2(1)+ --> 0(1)+) and E(4(1)+)/E(2(1)+) values is shown to exemplify the different ways yrast transition rates and energy levels sample collectivity. Model calculations for transitional nuclei show that this correlation provides a simple new signature to distinguish the two principal classes of nuclear shape transitions. C1 INST ATOM PHYS,BUCHAREST,ROMANIA. CLARK UNIV,WORCESTER,MA 01610. RP ZAMFIR, NV (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 4 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 20 PY 1993 VL 305 IS 4 BP 317 EP 321 DI 10.1016/0370-2693(93)91060-Z PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LB852 UT WOS:A1993LB85200001 ER PT J AU SHUSTOROVICH, E BELL, AT AF SHUSTOROVICH, E BELL, AT TI DECOMPOSITION AND REDUCTION OF NO ON TRANSITION-METAL SURFACES - BOND ORDER CONSERVATION MORSE POTENTIAL ANALYSIS SO SURFACE SCIENCE LA English DT Article ID SILICA-SUPPORTED RHODIUM; SINGLE-CRYSTAL SURFACE; NITRIC-OXIDE; RU(001) SURFACE; POLYCRYSTALLINE PLATINUM; SOLID-SURFACES; ADSORPTION; CHEMISORPTION; PT(111); OXYGEN AB Periodic trends in the decomposition of NO and its reduction to N2 and NH3 by CO and H2 on transition metal surfaces have been analyzed theoretically using the bond order conservation Morse potential (BOCMP) method. The analysis is based on calculations of the energetics, the reaction enthalpies DEKTAH and activation barriers DELTAH*, of elementary steps thought to comprise the mechanisms of the NO transformations. As the periodic series, the close-packed surfaces Pt(111), Rh(111), Ru(001), and Re(001) were chosen. The calculated heats of chemisorption Q Of NH3, NH2, NH, NO, H2O and OH are in good agreement with experiment. The activation barriers for dissociation of NO from a chemisorbed state, DELTAE(NOs)* were found to decrease in the order Pt > Rh > Ru > Re. For reasonable values of Q(N) and Q(O), in the zero-coverage extreme these activation barriers were calculated to be much smaller than the relevant heats of chemisorption Q(NO), so that dissociation of No upon heating is projected for all the surfaces studied with the possible exception of Pt(111). The presence of adsorbed N(s) and O(s) atoms may dramatically increase the values of DELTAE(NOs)*, for example, from 7-9 to 24-27 kcal/mol for Rh(100) and Rh(100)c(2 x 2)O,N, respectively. This sensitivity of the values of DELTAE(NOs)* to NO(s) coverage may explain the diversity of experimental results obtained for different coverages (exposures) and temperatures even for the same single crystal face. The anisotropy of the values of Q(X) (X = NO, N, O) for different surfaces and possible reconstructions of these surfaces also contribute to the balance between dissociation and desorption of NO. Of the two channels for recombinative desorption of N2, 2N(s) --> N2,g and N(s) + NO(s) --> N2,g + O(s) the latter has the smaller activation barrier. Because the N2 formation barriers rapidly increase in the order Pt approximately Rh much less than Ru much less than Re, Rh or Rh-Pt surfaces are projected to be the most efficient catalysts for NO reduction by CO (to N2 and CO2). Similarly, Pt surfaces are projected to be the most efficient catalysts for NO reduction by H-2 (to NH3 and H2O). The general mechanistic picture emerging from the BOCMP analysis concurs with experimental data. Some apparent inconsistencies, particularly concerning the dissociation of NO, are discussed and some model conclusions to be verified by future experiments are noted. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP SHUSTOROVICH, E (reprint author), EASTMAN KODAK CO,CORP RES LABS,ROCHESTER,NY 14650, USA. OI Bell, Alexis/0000-0002-5738-4645 NR 63 TC 87 Z9 91 U1 2 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 20 PY 1993 VL 289 IS 1-2 BP 127 EP 138 DI 10.1016/0039-6028(93)90892-N PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LE873 UT WOS:A1993LE87300021 ER PT J AU RODRIGUEZ, JA AF RODRIGUEZ, JA TI THE CHEMICAL-PROPERTIES OF BIMETALLIC SURFACES - BONDING BETWEEN CO AND ZN ON RU(001) SO SURFACE SCIENCE LA English DT Letter ID ELECTRONIC INTERACTIONS; ADSORPTION; CHEMISORPTION; CU(100); FILMS; CU; RH(100); PT(111); LEVEL; XPS AB The adsorption of CO on Zn/Ru(001) surfaces has been studied using thermal desorption mass spectroscopy, core and valence level photoemission and Auger spectroscopy. At 80 K, CO does not adsorb on thick Zn films under ultra-high vacuum conditions. In contrast, adsorption of the molecule is observed on Zn atoms bonded to Ru(001). Bimetallic bonding induces a reduction of approximately 0.5 eV in the binding energy of the core and valence levels of Zn. This shift probably increases the strength of the Zn-CO bond. CO molecules adsorbed on Zn adatoms show an O(1s) binding energy close to 535.2 eV and a desorption temperature of approximately 125 K. Both properties indicate that pi-backbonding is very weak in the Zn-CO bond. For CO chemisorption on Zn/Ru(001) surfaces, Zn blocks Ru sites approximately on a one-to-one basis and induces a weakening of the Ru-CO bond. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 38 TC 9 Z9 9 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 20 PY 1993 VL 289 IS 1-2 BP L584 EP L590 DI 10.1016/0167-2584(93)90725-X PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LE873 UT WOS:A1993LE87300002 ER PT J AU PICKERING, IJ GEORGE, GN LEWANDOWSKI, JT JACOBSON, AJ AF PICKERING, IJ GEORGE, GN LEWANDOWSKI, JT JACOBSON, AJ TI NICKEL K-EDGE X-RAY-ABSORPTION FINE-STRUCTURE OF LITHIUM NICKEL OXIDES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID LIXNI1-XO; STATES; OXYGEN; SPECTROSCOPY; METHANE; OXIDATION; LINIO2; HOLES AB Lithium nickel oxides, LixNi(1-x)O, with the lithium content x varying from 0.40 (close to the maximum value of 0.5) to 0 have been studied by using nickel K-edge X-ray absorption fine structure (XAFS) spectroscopy. The XANES (X-ray absorption near-edge structure) shows several distinct features whose energy and intensity evolve smoothly as a function of x. Quantitative analysis of the EXAFS (extended XAFS) data conclusively showed the presence of systematic structural trends with lithium content, x. In particular, we observed two different Ni-O bond lengths (2.07(1) and 1.94(1) angstrom) with proportions changing with x and systematic variations (with x) of the outer-shell Ni-Ni distances. Overall, the structural trends deduced from the XAFS data were found to be more consistent with an increased nickel oxidation state (Ni2+ to Ni3+) with increasing x rather than with an increased oxygen oxidation state (O2- to O-), although the true picture lies between these two extremes. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. RP PICKERING, IJ (reprint author), STANFORD UNIV,SLAC,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94309, USA. RI George, Graham/E-3290-2013; Pickering, Ingrid/A-4547-2013; OI Pickering, Ingrid/0000-0002-0936-2994 NR 37 TC 60 Z9 60 U1 1 U2 16 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 MAY 19 PY 1993 VL 115 IS 10 BP 4137 EP 4144 DI 10.1021/ja00063a035 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA LC953 UT WOS:A1993LC95300035 ER PT J AU MARCHI, M GEHLEN, JN CHANDLER, D NEWTON, M AF MARCHI, M GEHLEN, JN CHANDLER, D NEWTON, M TI DIABATIC SURFACES AND THE PATHWAY FOR PRIMARY ELECTRON-TRANSFER IN A PHOTOSYNTHETIC REACTION CENTER SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID PRIMARY CHARGE SEPARATION; BACTERIUM RHODOPSEUDOMONAS-VIRIDIS; FEMTOSECOND SPECTROSCOPY; MOLECULAR-DYNAMICS; SPHAEROIDES R-26; ENERGY; SIMULATIONS; MECHANISM; MOTION; SYSTEM AB We have performed molecular dynamics simulations for two different models of a photosynthetic reaction center (Rps. viridis) to examine the diabatic surfaces governing the primary charge separation after photoexcitation. We include the electrostatic energy of the entire proteic complex and also account for the energies of the electronic states of chromophores as computed by semiempirical quantum theory. The statistics we have acquired from our dynamics trajectories is sufficient to contrast the behaviors of the two models, to deduce the effects of crystallization water, and to measure the size of nonlinear response on the pertinent diabatic surfaces. Further, with the perspective we develop, we are able to juxtapose the active and inactive branches of the reaction center. By renormalizing our computed diabatic surfaces with a physically reasonable value for the high-frequency dielectric response of the system, the simulation results can be brought into accord with experimental observations of the thermodynamic driving force for the primary electron transfer. With no further adjustment, we find that the diabatic surfaces for the excited special pair state, SP*, and the charge-separated state SP+-BPL- intersect with essentially no activation barrier. Here, BPL refers to the bacteriopheophytin on the L branch. In contrast, the SP* and SP+-BPM- surfaces intersect in the normal region with an activation barrier and an endothermic thermodynamic driving force. A related observation is that we find fluctuations in the pertinent energy gaps to be significantly smaller on the active L branch than they are on the inactive M branch. We also examine the surfaces associated with moving charge to the accessory bacteriochlorophylls, BCL and BCM. We find that these surfaces lie at energies far above SP*. This finding excludes the possibility of a two-step mechanism within our model for the primary charge transfer; it agrees roughly with Thompson and Zerner's estimate based on a dielectric continuum model. We make simple estimates based upon a superexchange mechanism with physically reasonable nearest-neighbor electronic coupling that indicate our computed diabatic surfaces are consistent with the experimentally observed kinetics of the primary electron transfer. We consider also the temperature dependence of the forward rate and the ratio of the rate of the back-reaction, SP+-BPL --> SP to the rate of the forward reaction. Here, we carry out quantal analyses based upon our computed spectral densities for the energy gap fluctuations. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV PARIS 11, CECAM, F-91405 ORSAY, FRANCE. BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. RI Marchi, Massimo/E-1792-2011 OI Marchi, Massimo/0000-0003-4890-6349 NR 58 TC 227 Z9 231 U1 4 U2 24 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 19 PY 1993 VL 115 IS 10 BP 4178 EP 4190 DI 10.1021/ja00063a041 PG 13 WC Chemistry, Multidisciplinary SC Chemistry GA LC953 UT WOS:A1993LC95300041 ER PT J AU WEILLER, BH WASSERMAN, EP MOORE, CB BERGMAN, RG AF WEILLER, BH WASSERMAN, EP MOORE, CB BERGMAN, RG TI ORGANOMETALLIC CO SUBSTITUTION KINETICS IN LIQUID XE BY FAST TIME-RESOLVED IR SPECTROSCOPY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID BOND ACTIVATION; H ACTIVATION; COMPLEXES; PHOTOCHEMISTRY; MECHANISM; ALKANE; IRIDIUM; ENERGY; GASES AB The reaction of Cp*Rh(CO)Xe (Cp* = C5Me5) with CO was studied using time-resolved IR spectroscopy of liquid rare gas solutions. IR spectra for Cp*Rh(CO)Xe were obtained using pulsed UV laser photolysis of Cp*Rh-(CO)2 in liquid Xe and a rapid-scan FTIR spectrometer with 0.09-s time resolution. Assignment to the Xe complex was confirmed from the similarity of the spectra and lifetime of the complex when a mixture of Xe in liquid Kr was used. The reaction of Cp*Rh(CO)Xe with added CO is very fast, and the rate constant was measured by fast time-resolved IR spectroscopy to be (5.7 +/- 0.6) X 10(5) to (1.9 +/- 0.2) X 10(6) M-1 s-1 over the temperature range 202-242 K. The kinetics are consistent with an associative substitution mechanism with activation parameters for the bimolecular rate constant of log(A) = 8.8 +/- 0.3 (DELTAS double dagger = -20 +/- 1 cal/(mol K)) and E(a) = 2.8 +/- 0.3 kcal/mol (DELTAH double dagger = 2.4 +/- 0.3 kcal/mol). C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP WEILLER, BH (reprint author), AEROSP CORP,CTR MECH & MAT TECHNOL,POB 92957,LOS ANGELES,CA 90009, USA. NR 40 TC 41 Z9 41 U1 3 U2 9 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 MAY 19 PY 1993 VL 115 IS 10 BP 4326 EP 4330 DI 10.1021/ja00063a058 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA LC953 UT WOS:A1993LC95300058 ER PT J AU MENDEL, D ELLMAN, J SCHULTZ, PG AF MENDEL, D ELLMAN, J SCHULTZ, PG TI PROTEIN-BIOSYNTHESIS WITH CONFORMATIONALLY RESTRICTED AMINO-ACIDS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID SITE-SPECIFIC INCORPORATION; ALPHA-AMINOISOBUTYRIC-ACID; CHEMICAL AMINOACYLATION; NONNATURAL RESIDUES; TRANSFER-RNAS; SIDE-CHAINS; PEPTIDES; SUPPRESSION; ROUTE C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RI Ellman, Jonathan/C-7732-2013 NR 33 TC 82 Z9 82 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 19 PY 1993 VL 115 IS 10 BP 4359 EP 4360 DI 10.1021/ja00063a063 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LC953 UT WOS:A1993LC95300063 ER PT J AU CHEN, LX BOWMAN, MK MONTANO, PA NORRIS, JR AF CHEN, LX BOWMAN, MK MONTANO, PA NORRIS, JR TI X-RAY-ABSORPTION STRUCTURAL STUDY OF A REVERSIBLE, PHOTOEXCITED CHARGE-TRANSFER STATE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID FINE-STRUCTURE; CARBOXYMYOGLOBIN C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Bowman, Michael/F-4265-2011 OI Bowman, Michael/0000-0003-3464-9409 NR 11 TC 10 Z9 10 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 MAY 19 PY 1993 VL 115 IS 10 BP 4373 EP 4374 DI 10.1021/ja00063a070 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LC953 UT WOS:A1993LC95300070 ER PT J AU LOO, RRO GOODLETT, DR SMITH, RD LOO, JA AF LOO, RRO GOODLETT, DR SMITH, RD LOO, JA TI OBSERVATION OF A NONCOVALENT RIBONUCLEASE S-PROTEIN S-PEPTIDE COMPLEX BY ELECTROSPRAY IONIZATION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CAPILLARY ZONE ELECTROPHORESIS; SPECTRA; DISSOCIATION; INTERFACE; IONS 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 37 TC 54 Z9 54 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 19 PY 1993 VL 115 IS 10 BP 4391 EP 4392 DI 10.1021/ja00063a079 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LC953 UT WOS:A1993LC95300079 ER PT J AU ZOLPER, JC BACA, AG CHALMERS, SA AF ZOLPER, JC BACA, AG CHALMERS, SA TI THERMALLY STABLE OXYGEN IMPLANT ISOLATION OF P-TYPE AL0.2GA0.8AS SO APPLIED PHYSICS LETTERS LA English DT Article AB High dose oxygen implantation was used to form high resistivity regions in p-type Al0.2Ga0.8As. By achieving oxygen concentrations 30 times the grown-in beryllium concentration we created Al0.2Ga0.8As layers with a sheet resistance of over 10(10) OMEGA/square that were stable to 900-degrees-C. Samples implanted with a base dose of 2x10(14) cm-2 showed an apparent activation energy for conduction of 0.67 eV after annealing at 800-degrees-C. RP ZOLPER, JC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 14 Z9 14 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 MAY 17 PY 1993 VL 62 IS 20 BP 2536 EP 2538 DI 10.1063/1.109288 PG 3 WC Physics, Applied SC Physics GA LB885 UT WOS:A1993LB88500027 ER PT J AU NELSON, AJ SCHWERDTFEGER, CR WEI, SH ZUNGER, A RIOUX, D PATEL, R HOCHST, H AF NELSON, AJ SCHWERDTFEGER, CR WEI, SH ZUNGER, A RIOUX, D PATEL, R HOCHST, H TI THEORETICAL AND EXPERIMENTAL STUDIES OF THE ZNSE/CUINSE2 HETEROJUNCTION BAND OFFSET SO APPLIED PHYSICS LETTERS LA English DT Article ID SCHOTTKY-BARRIER; SEMICONDUCTORS; CUINSE2; DIPOLES AB We report first-principles band structure calculations that show that ZnSe/CuInSe2 has a significant valence band offset (VBO, DELTAE(v)): 0.70 +/- 0.05 eV for the relaxed interface and 0.60 +/- 0.05 eV for the coherent interface. These large values demonstrate the failure of the common anion rule. This is traced to a stronger Cu,d-Se,p level repulsion in CuInSe2 than the Zn,d-Se,p repulsion in ZnSe. The VBO was then studied by synchrotron radiation soft x-ray photoemission spectroscopy. ZnSe overlayers were sequentially grown in steps on n-type CuInSe2 (112) single crystals at 200-degrees-C. In situ photoemission measurements were acquired after each growth in order to observe changes in the valence band electronic structure as well as changes in the In 4d and Zn 3d core lines. Results of these measurements reveal that the VBO is DELTAE(v) = 0.70 +/- 0.15 eV, in good agreement with the first-principles prediction. C1 UNIV WISCONSIN MADISON, CTR SYNCHROTRON RADIAT, STOUGHTON, WI 53589 USA. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 20 TC 31 Z9 31 U1 1 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 17 PY 1993 VL 62 IS 20 BP 2557 EP 2559 DI 10.1063/1.109295 PG 3 WC Physics, Applied SC Physics GA LB885 UT WOS:A1993LB88500034 ER PT J AU DUCRET, JE BERNHEIM, M BRUSSEL, MK CAPITANI, GP DANEL, JF DESANCTIS, E FRULLANI, S GARIBALDI, F GHIO, F JACKSON, HE JODICE, M LAKEHALAYAT, L LEGOFF, JM MAGNON, A MARCHAND, C MEZIANI, ZE MORGENSTERN, J VERNIN, P ZGHICHE, A AF DUCRET, JE BERNHEIM, M BRUSSEL, MK CAPITANI, GP DANEL, JF DESANCTIS, E FRULLANI, S GARIBALDI, F GHIO, F JACKSON, HE JODICE, M LAKEHALAYAT, L LEGOFF, JM MAGNON, A MARCHAND, C MEZIANI, ZE MORGENSTERN, J VERNIN, P ZGHICHE, A TI THE LONGITUDINAL AND TRANSVERSE STRUCTURE FUNCTIONS OF THE HE-4(E, E'P)H-3 REACTION SO NUCLEAR PHYSICS A LA English DT Article DE HE-4(E,E'P), E = 720 MEV; MEASURED LONGITUDINAL; TRANSVERSE STRUCTURE FUNCTIONS; HE-4 DEDUCED PROTON MAGNETIC RMS RADIUS; MODEL COMPARISON ID QUASIELASTIC ELECTRON-SCATTERING; SEPARATED RESPONSE FUNCTIONS; COULOMB SUM-RULE; REACTION C-12(E,E'P); NUCLEAR-MEDIUM; 2-BODY ELECTRODISINTEGRATION; IMPULSE APPROXIMATION; CROSS-SECTIONS; BOUND-NUCLEON; FORM-FACTORS AB He-4(e, e'p)H-3 cross sections were measured in parallel kinematics for recoil momenta of 30, 90 and 190 MeV/c. For 30 and 90 MeV/c, the cross sections were also measured as a function of the momentum transfer between 0.30 and 0.83 GeV/c. A Rosenbluth decomposition of the cross sections was made, and experimental longitudinal and transverse spectral functions were derived. The longitudinal spectral function is quenched by about 40% relative to the transverse. After model-dependent corrections for final-state interactions, mesonic currents, and charge exchange scattering, the quenching remains at the level of congruent-to 20%. The spectral functions are compared to calculations employing realistic He-4 wave functions. The longitudinal function is below the theoretical value; the transverse function is in agreement. The spectral function data reveal no significant q-dependence and imply an r.m.s. proton magnetic radius in He-4 within a few percent of the free value. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. CTR ETUD SACLAY,SERV PHYS NUCL,F-91191 GIF SUR YVETTE,FRANCE. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. IST SUPER SANITA,FIS LAB,I-00161 ROME,ITALY. IST NAZL FIS NUCL,I-00161 ROME,ITALY. RI Le Goff, Jean-Marc/E-7629-2013; GHIO, FRANCESCO/F-2092-2015 NR 80 TC 21 Z9 21 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 17 PY 1993 VL 556 IS 3 BP 373 EP 395 DI 10.1016/0375-9474(93)90367-7 PG 23 WC Physics, Nuclear SC Physics GA LT375 UT WOS:A1993LT37500004 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, M FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, MA HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PALLAVICINI, M PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, PA RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, M FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, MA HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PALLAVICINI, M PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, PA RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G TI MEASUREMENT OF THE GAMMA-GAMMA-PARTIAL WIDTH OF THE CHI-2 CHARMONIUM RESONANCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID CALORIMETER; STATES AB The E760 Collaboration has studied the reaction ppBAR --> chi2 --> gammagamma using a hydrogen gas jet target in the Fermilab antiproton accumulator ring. The following values are obtained for the branching ratio and partial width to two photons; B(chi2 --> gammagamma) = (1.60 +/- 0.45) X 10(-4) and GAMMA(chi2 --> gammagamma) = 321 +/- 95 eV. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GENOA,I-16146 GENOA,ITALY. UNIV CALIF IRVINE,IRVINE,CA 92717. NORTHWESTERN UNIV,EVANSTON,IL 60208. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TURIN,I-10125 TURIN,ITALY. RP ARMSTRONG, TA (reprint author), PENN STATE UNIV,UNIV PK,PA 16802, USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Patrignani, Claudia/C-5223-2009; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Patrignani, Claudia/0000-0002-5882-1747; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 15 TC 40 Z9 40 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 MAY 17 PY 1993 VL 70 IS 20 BP 2988 EP 2991 DI 10.1103/PhysRevLett.70.2988 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400004 ER PT J AU BARRETTE, J BELLWIED, R BENNETT, S BRAUNMUNZINGER, P CLELAND, WE CORMIER, TM DAVID, G DEE, J DIEBOLD, GE DIETZSCH, O FOX, D GERMANI, JV GILBERT, S GREENE, SV HALL, JR HEMMICK, TK HERRMANN, N HONG, B JAYANANDA, K KRAUS, D KUMAR, BS LACASSE, R LI, Q LISSAUER, D LLOPE, WJ LUDLAM, TW MCCORKLE, S MAJKA, R MARK, SK MATHEUS, R MITCHELL, JT MUTHUSWAMY, M OBRIEN, E PANITKIN, S PRUNEAU, C RAO, MN ROSATI, M ROTONDO, F DASILVA, NC SIMONGILLO, J SONNADARA, U STACHEL, J SULLIVAN, J TAKAI, H TAKAGUI, EM THROWE, TG WINTER, C WANG, G WOLF, KL WOLFE, D WOODY, CL XU, N ZHANG, Y ZHANG, Z ZOU, C AF BARRETTE, J BELLWIED, R BENNETT, S BRAUNMUNZINGER, P CLELAND, WE CORMIER, TM DAVID, G DEE, J DIEBOLD, GE DIETZSCH, O FOX, D GERMANI, JV GILBERT, S GREENE, SV HALL, JR HEMMICK, TK HERRMANN, N HONG, B JAYANANDA, K KRAUS, D KUMAR, BS LACASSE, R LI, Q LISSAUER, D LLOPE, WJ LUDLAM, TW MCCORKLE, S MAJKA, R MARK, SK MATHEUS, R MITCHELL, JT MUTHUSWAMY, M OBRIEN, E PANITKIN, S PRUNEAU, C RAO, MN ROSATI, M ROTONDO, F DASILVA, NC SIMONGILLO, J SONNADARA, U STACHEL, J SULLIVAN, J TAKAI, H TAKAGUI, EM THROWE, TG WINTER, C WANG, G WOLF, KL WOLFE, D WOODY, CL XU, N ZHANG, Y ZHANG, Z ZOU, C TI MEASUREMENT OF TRANSVERSE ENERGY-PRODUCTION WITH SI AND AU BEAMS AT RELATIVISTIC ENERGY - TOWARDS HOT AND DENSE HADRONIC MATTER SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; FLOW AB We present a systematic study of transverse energy (E(T)) production in collisions of 11.4A GeV/c Au and 14.6A GeV/c Si ions with targets of Al, Au, and Pb. Comparison of data for Au+Au and Si+Al indicates that, for the heavier system, there is an increase in the amount of stopping which is accompanied by a decrease in the width of the dE(T)/d(eta) distribution. The ratio of the maximum E(T) observed for the two systems is significantly greater than the ratio of the total energy available in the center of mass frame. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. GESELL SCHWERIONENFORSCH MBH,W-6100 DARMSTADT 11,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SUNY,STONY BROOK,NY 11794. UNIV SAO PAULO,SAO PAULO,BRAZIL. TEXAS A&M UNIV SYST,COLL STN,TX 77843. WAYNE STATE UNIV,DETROIT,MI 48202. YALE UNIV,NEW HAVEN,CT 06511. RP BARRETTE, J (reprint author), MCGILL UNIV,MONTREAL H3A 2T5,QUEBEC,CANADA. RI Takai, Helio/C-3301-2012; OI Takai, Helio/0000-0001-9253-8307; Sonnadara, Upul/0000-0001-7862-2537 NR 18 TC 56 Z9 57 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 17 PY 1993 VL 70 IS 20 BP 2996 EP 2999 DI 10.1103/PhysRevLett.70.2996 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400006 ER PT J AU SULLIVAN, JP BERENGUER, M JACAK, BV PRATT, S SARABURA, M SIMONGILLO, J SORGE, H VANHECKE, H AF SULLIVAN, JP BERENGUER, M JACAK, BV PRATT, S SARABURA, M SIMONGILLO, J SORGE, H VANHECKE, H TI BOSE-EINSTEIN CORRELATIONS OF PION PAIRS AND KAON PAIRS FROM RELATIVISTIC QUANTUM MOLECULAR-DYNAMICS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; NUCLEAR COLLISIONS; 2-PION CORRELATIONS; HADRONIC MATTER; INTERFEROMETRY; ENERGIES AB Bose-Einstein correlations between charged pion and K+ pairs are calculated using the space-time and four-momentum distributions from relativistic quantum molecular dynamics for 200 GeV/nucleon S-32+Pb and compared to pion correlation measurements from two CERN experiments. Good agreement is found. The predicted apparent radii from the K+ correlation functions are smaller than the corresponding pion radii. C1 MICHIGAN STATE UNIV,E LANSING,MI 48824. RP SULLIVAN, JP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 31 TC 75 Z9 77 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 MAY 17 PY 1993 VL 70 IS 20 BP 3000 EP 3003 DI 10.1103/PhysRevLett.70.3000 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400007 ER PT J AU BUDKER, D DEMILLE, D COMMINS, ED ZOLOTOREV, MS AF BUDKER, D DEMILLE, D COMMINS, ED ZOLOTOREV, MS TI INVESTIGATION OF NEARLY DEGENERATE OPPOSITE PARITY STATES IN ATOMIC DYSPROSIUM SO PHYSICAL REVIEW LETTERS LA English DT Article AB A pair of closely lying states of opposite parity and the same total electronic angular momentum J = 10 at 19797.96 cm-1 in dysprosium are experimentally investigated with the goal of evaluating parameters relevant to P and P, T violation experiments. Measurements of lifetimes, electric polarizability, and energy intervals between isotope and hyperfine components are presented. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP BUDKER, D (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 20 TC 9 Z9 9 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 MAY 17 PY 1993 VL 70 IS 20 BP 3019 EP 3022 DI 10.1103/PhysRevLett.70.3019 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400012 ER PT J AU CHEN, SY DOOLEN, G HERRING, JR KRAICHNAN, RH ORSZAG, SA SHE, ZS AF CHEN, SY DOOLEN, G HERRING, JR KRAICHNAN, RH ORSZAG, SA SHE, ZS TI FAR-DISSIPATION RANGE OF TURBULENCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID HOMOGENEOUS TURBULENCE; SPECTRUM AB Navier-Stokes turbulence at low Reynolds number (R(lambda) almost-equal-to 15) is studied by high-resolution computer simulation. The energy spectrum in the range 5k(d) < k < 10k(d) is well fitted by k(alpha) exp(-ck/k(d)), where k(d) is the Kolmogorov dissipation wave number, alpha almost-equal-to 3.3 and c almost-equal-to 7.1. High-order spatial derivatives of the velocity field exhibit strong intermittency, associated with gentle spatial variation of large-scale structure rather than with sparse, intense small-scale structures. Analysis by the direct-interaction approximation, which ignores intermittency, gives alpha = 3, c almost-equal-to 11. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. NATL CTR ATMOSPHER RES,BOULDER,CO 80302. PRINCETON UNIV,PROGRAM APPL & COMPUTAT MATH,PRINCETON,NJ 08544. UNIV ARIZONA,DEPT MATH,TUCSON,AZ 85721. RP CHEN, SY (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Chen, Shiyi/A-3234-2010; 佘, 振苏/C-1447-2010; She, Zhen-Su/H-9722-2014 NR 17 TC 59 Z9 59 U1 1 U2 7 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 MAY 17 PY 1993 VL 70 IS 20 BP 3051 EP 3054 DI 10.1103/PhysRevLett.70.3051 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400020 ER PT J AU KROMMES, JA AF KROMMES, JA TI THERMAL FLUCTUATIONS IN GYROKINETIC PLASMA AT FINITE-BETA SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTICLE SIMULATION; EQUATIONS AB A covariant gyrokinetic fluctuation-dissipation theorem is used to predict unusual thermal-equilibrium fluctuation spectra for weakly electromagnetic gyrokinetic plasma in the limit of weak coupling. Wave number spectra are derived both by exact integrations of the frequency spectra and by resonance integrations over weakly damped normal modes. The former reduce in the electrostatic limit to previous heuristic results and are interpreted in terms of the concept of a ''gyrokinetic vacuum.'' The latter are interpreted in terms of a new form for the gyrokinetic energy conservation law and a new formula for the gyrokinetic plasmon action density. RP KROMMES, JA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 26 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 17 PY 1993 VL 70 IS 20 BP 3067 EP 3070 DI 10.1103/PhysRevLett.70.3067 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400024 ER PT J AU SONG, YQ HALPERIN, WP TONGE, L MARKS, TJ LEDVIJ, M KOGAN, VG BULAEVSKII, LN AF SONG, YQ HALPERIN, WP TONGE, L MARKS, TJ LEDVIJ, M KOGAN, VG BULAEVSKII, LN TI LOW-TEMPERATURE FLUCTUATIONS OF VORTICES IN LAYERED SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MAGNETIC PENETRATION DEPTH; HIGH-TC SUPERCONDUCTORS; ANISOTROPY; RELAXATION; TL-205 AB Data on the Tl-205 NMR frequency shift and linewidth due to the magnetic field variation in the mixed state of Tl2Ba2Ca2Cu3O10 are presented. These data, which are commonly used to extract the London penetration depth, show a near linear temperature dependence at T << T(c). We offer an explanation of this effect as being caused by thermal fluctuations of vortices in weakly coupled layered systems. We argue that the fluctuations cannot be ignored in interpretation of NMR and muon-spin-resonance data for materials with large penetration depths even at low T. C1 NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCONDUCT,EVANSTON,IL 60208. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SONG, YQ (reprint author), NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60208, USA. NR 20 TC 45 Z9 45 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 17 PY 1993 VL 70 IS 20 BP 3127 EP 3130 DI 10.1103/PhysRevLett.70.3127 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400039 ER PT J AU THURSTON, TR HELGESEN, G GIBBS, D HILL, JP GAULIN, BD SHIRANE, G AF THURSTON, TR HELGESEN, G GIBBS, D HILL, JP GAULIN, BD SHIRANE, G TI OBSERVATION OF 2 LENGTH SCALES IN THE MAGNETIC CRITICAL FLUCTUATIONS OF HOLMIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID R-POINT INSTABILITY; X-RAY-SCATTERING; PHASE-TRANSITIONS; CRITICAL-BEHAVIOR; SRTIO3; RESONANCE; RBCAF3; KMNF3; HEAT; HO AB The short-ranged correlations associated with magnetic ordering in the rare earth antiferromagnet holmium have been characterized in high-resolution x-ray and neutron scattering studies. We find that within about 2 K of T(c), the magnetic fluctuations exhibit two length scales, instead of one as expected in an ideal system. This result is reminiscent of behavior observed at the cubic-to-tetragonal structural phase transitions of the perovskites. C1 MIT,CAMBRIDGE,MA 02139. MCMASTER UNIV,HAMILTON L8S 4M1,ONTARIO,CANADA. RP THURSTON, TR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Hill, John/F-6549-2011; Piper, Walter/B-7908-2009 NR 28 TC 79 Z9 79 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 MAY 17 PY 1993 VL 70 IS 20 BP 3151 EP 3154 DI 10.1103/PhysRevLett.70.3151 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400045 ER PT J AU KING, DM SHEN, ZX DESSAU, DS WELLS, BO SPICER, WE ARKO, AJ MARSHALL, DS DICARLO, J LOESER, AG PARK, CH RATNER, ER PENG, JL LI, ZY GREENE, RL AF KING, DM SHEN, ZX DESSAU, DS WELLS, BO SPICER, WE ARKO, AJ MARSHALL, DS DICARLO, J LOESER, AG PARK, CH RATNER, ER PENG, JL LI, ZY GREENE, RL TI FERMI-SURFACE AND ELECTRONIC-STRUCTURE OF ND2-XCEXCUO4-DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID ANGLE-RESOLVED-PHOTOEMISSION; TEMPERATURE-DEPENDENCE; SINGLE-CRYSTALS; CU-O; YBA2CU3O7-DELTA; GROWTH; STATE; LEVEL; ND AB Using angle-resolved photoemission, we have mapped out the Fermi surface (FS) of single crystal Nd2-xCexCuO4-delta when doped as a superconductor (x = 0.15) and overdoped as a metal (x = 0.22). The measured FS agrees very well with local-density-approximation calculations and appears to shift with electron doping as expected by a band-filling scenario. The observed FS shape suggests that a model Hamiltonian with only nearest-neighbor interactions is not sufficient to describe the electronic structure near E(F); next-nearest-neighbor interactions should also be considered. C1 STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV MARYLAND,DEPT PHYS,CTR SUPERCOND RES,COLL PK,MD 20742. RP KING, DM (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. NR 24 TC 188 Z9 190 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 17 PY 1993 VL 70 IS 20 BP 3159 EP 3162 DI 10.1103/PhysRevLett.70.3159 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400047 ER PT J AU ANDERSON, RO CLAESSEN, R ALLEN, JW OLSON, CG JANOWITZ, C LIU, LZ PARK, JH MAPLE, MB DALICHAOUCH, Y DEANDRADE, MC JARDIM, RF EARLY, EA OH, SJ ELLIS, WP AF ANDERSON, RO CLAESSEN, R ALLEN, JW OLSON, CG JANOWITZ, C LIU, LZ PARK, JH MAPLE, MB DALICHAOUCH, Y DEANDRADE, MC JARDIM, RF EARLY, EA OH, SJ ELLIS, WP TI LUTTINGER FERMI-SURFACE OF METALLIC GAP SPECTRAL WEIGHT IN ND1.85CE0.15CUO4-Y SO PHYSICAL REVIEW LETTERS LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; X-RAY-ABSORPTION; CU-O; ELECTRONIC-STRUCTURE; COPPER OXIDES; STATES; SUPERCONDUCTORS; SPECTROSCOPY; ND2-XCEXCUO4; LEVEL AB Angle-resolved photoemission measurements for bulk single crystals of Nd2-xCexCuO4-y with x = 0.15 show that the spectral weight which builds in the gap of the x = 0 insulator displays a Luttinger Fermi surface, the first such observation for a material which is electron doped and which must be driven metallic by alloying. This finding greatly strengthens our previous conclusion that the metal's chemical potential lies in gap-filling spectral weight, and sharpens the distinction between theories in which this does or does not occur. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. SEOUL NATL UNIV,DEPT PHYS,SEOUL 151742,SOUTH KOREA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV SAO PAULO,INST FIS,BR-20516 SAO PAULO,BRAZIL. RP ANDERSON, RO (reprint author), UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. RI Jardim, Renato/J-8068-2014; Claessen, Ralph/A-2045-2017 OI Jardim, Renato/0000-0002-2000-0257; Claessen, Ralph/0000-0003-3682-6325 NR 29 TC 109 Z9 111 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 MAY 17 PY 1993 VL 70 IS 20 BP 3163 EP 3166 DI 10.1103/PhysRevLett.70.3163 PG 4 WC Physics, Multidisciplinary SC Physics GA LB784 UT WOS:A1993LB78400048 ER PT J AU MAINIERI, R ECKE, RE AF MAINIERI, R ECKE, RE TI PHASE-SHIFT IN EXPERIMENTAL TRAJECTORY SCALING FUNCTIONS SO PHYSICS LETTERS A LA English DT Article ID STRANGE SETS; BEHAVIOR AB For one-dimensional maps the trajectory scaling function is invariant under coordinate transformations and can be used to compute any ergodic average. It is the most stringent test between theory and experiment, but so far it has proven difficult to extract from experimental data. It is shown that the main difficulty is a dephasing of the experimental orbit which can be corrected by reconstructing the dynamics from several time series. From the reconstructed dynamics the scaling function can be accurately extracted. RP MAINIERI, R (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS B258,LOS ALAMOS,NM 87545, USA. OI Ecke, Robert/0000-0001-7772-5876 NR 13 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 17 PY 1993 VL 176 IS 5 BP 327 EP 332 DI 10.1016/0375-9601(93)90927-R PG 6 WC Physics, Multidisciplinary SC Physics GA LC334 UT WOS:A1993LC33400009 ER PT J AU VANBERKEL, GJ GOERINGER, DE AF VANBERKEL, GJ GOERINGER, DE TI GAS-CHROMATOGRAPHY TANDEM MASS-SPECTROMETRY IMPLEMENTED ON A BENCH-TOP QUADRUPOLE ION TRAP-BASED INSTRUMENT USING RANDOM NOISE TO EFFECT COLLISION-INDUCED DISSOCIATION SO ANALYTICA CHIMICA ACTA LA English DT Article DE GAS-CHROMATOGRAPHY MASS-SPECTROMETRY; COLLISION-INDUCED DISSOCIATION; DIETHYLANILINE; TANDEM MS; QUADRUPOLE ION TRAP ID EXCITATION; IONIZATION AB A simple and effective method for collision-induced dissociation (CID), implemented through application of random noise to an end-cap electrode, allows gas chromatography (GC)-tandem mass spectrometry (MS-MS) experiments to be performed on a commercial bench-top quadrupole ion trap mass spectrometer. Details of the random noise CID experiment, the characteristics of the noise spectrum, and the effect of varying noise spectrum and ion trap parameters on MS-MS spectra are discussed using NN-diethylaniline as a model compound. Compromises to the technique imposed by current software flexibility limitations are also discussed. GC-MS-MS spectra, generated using random noise CID, are shown for methamphetamine and amphetamine ionized via isobutane chemical ionization. RP VANBERKEL, GJ (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 40 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD MAY 15 PY 1993 VL 277 IS 1 BP 41 EP 54 DI 10.1016/0003-2670(93)85087-Z PG 14 WC Chemistry, Analytical SC Chemistry GA LA451 UT WOS:A1993LA45100005 ER PT J AU DUNPHY, JC BUSCH, KL HETTICH, RL BUCHANAN, MV AF DUNPHY, JC BUSCH, KL HETTICH, RL BUCHANAN, MV TI RAPID EXTRACTION AND STRUCTURAL CHARACTERIZATION OF BIOMOLECULES IN AGAROSE GELS BY LASER DESORPTION FOURIER-TRANSFORM MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; ELECTROSPRAY IONIZATION; PROTEINS; DNA; OLIGONUCLEOTIDES; IONS; INTERFACE; RNA AB A method originally developed for the extraction of biomolecules from agarose gel slices has been utilized as a rapid means of isolating biological compounds from gels for subsequent structural characterization by matrix-assisted laser desorption-ionization Fourier transform mass spectrometry (MALDI/FTMS). This''freeze-squeeze'' extraction method involves pressure extrusion of fluid from frozen gel slices and provides near 50% recovery of analyte in less than 5 min. Experiments were directed at examining the recovery efficiency of the extraction method using C-14-labeled adenosine monophosphate and investigating the effect of high buffer concentrations on the laser desorption mass spectra. When coupled with this extraction technique, MALDI/FTMS can be used to detect and identify biomolecules at the low picomole level in agarose gel slices. The accurate mass measurements and MS/MS capabilities of the FTMS were exploited to provide detailed structural information at the isomeric level for oligonucleotides electrophoresed into agarose gels. C1 GEORGIA INST TECHNOL,SCH CHEM & BIOCHEM,ATLANTA,GA 30332. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37830. RI Hettich, Robert/N-1458-2016; Buchanan, Michelle/J-1562-2016 OI Hettich, Robert/0000-0001-7708-786X; Buchanan, Michelle/0000-0002-8078-4575 NR 41 TC 14 Z9 15 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 15 PY 1993 VL 65 IS 10 BP 1329 EP 1335 DI 10.1021/ac00058a006 PG 7 WC Chemistry, Analytical SC Chemistry GA LC098 UT WOS:A1993LC09800007 PM 8517545 ER PT J AU WINARDI, R REID, M CONBOY, J MOHANDAS, N AF WINARDI, R REID, M CONBOY, J MOHANDAS, N TI MOLECULAR ANALYSIS OF GLYCOPHORIN-C DEFICIENCY IN HUMAN ERYTHROCYTES SO BLOOD LA English DT Article ID MEMBRANE SIALOGLYCOPROTEIN-BETA; MONOCLONAL-ANTIBODIES; GENETIC-VARIANTS; PROTEIN 4.1; RED-CELLS; ELLIPTOCYTOSIS C1 LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,1 CYCLOTRON RD,MS 74-157,BERKELEY,CA 94720. NEW YORK BLOOD CTR,NEW YORK,NY 10021. FU NIDDK NIH HHS [DK32094] NR 23 TC 8 Z9 8 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD MAY 15 PY 1993 VL 81 IS 10 BP 2799 EP 2803 PG 5 WC Hematology SC Hematology GA LC496 UT WOS:A1993LC49600044 PM 7683929 ER PT J AU AHMED, FE SETLOW, RB AF AHMED, FE SETLOW, RB TI ULTRAVIOLET RADIATION-INDUCED DNA DAMAGE AND ITS PHOTOREPAIR IN THE SKIN OF THE PLATYFISH XIPHOPHORUS SO CANCER RESEARCH LA English DT Article ID PYRIMIDINE DIMERS; XERODERMA PIGMENTOSUM; HUMAN-CELLS; REPAIR; PHOTOPRODUCTS; CYCLOBUTANE; QUANTITATION; INACTIVATION; FIBROBLASTS; MELANOMA AB Fluence response relationships for the induction of DNA damage in the skin of UV-irradiated Xiphophorus fish were obtained by quantitative gel electrophoresis of unlabeled DNA following extraction and treatment with an enzyme preparation that makes single strand breaks next to cyclobutane pyrimidine dimers. A buffer containing 7 M urea minimized the degradation of DNA during extraction and gave reproducible results. The shapes of fluence response curves for the production of dimers by sun lamp irradiation (lambda > 290 nm) or 302 nm in the dermis of grown fish were similar. Photoreversal of dimers was readily observed by black light exposure or from the longer wavelengths (>304 nm) from sun lamps. As expected, the number of pyrimidine dimers/incident fluence in young fish skin was considerably higher on the irradiated side of immobilized fish than it was in swimming (randomly moving) fish, and the shape of the fluence response curves was linear for all wavelengths used lambda >290, 302, and 313 nm. On the other hand, young fish irradiated from above with lambda >290 nm showed a less than linear relationship between pyrimidine dimers in their skin and radiation fluence because most exposure occurred on the dorsal rim of fish skin; thus, some cells in that skin were exposed to high fluences while others were not, leading to a heterogenous population of cells. Values of dimers produced were also much less than in immobilized fish. The pigment melanin decreased the number of dimers in the epidermis of grown fish exposed to lambda >290, 302, or 313 nm, or in the dermis of fish following 302 nm, thus conferring protection against this kind of damage. No dimers were detected in the epidermis of fish exposed to 365 nm. The dimers produced at 302 and 313 nm at tumoricidal exposures correspond to 1 dimer in 10(5) base pairs. RP AHMED, FE (reprint author), BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. NR 40 TC 55 Z9 56 U1 0 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA 615 CHESTNUT ST, 17TH FLOOR, PHILADELPHIA, PA 19106-4404 USA SN 0008-5472 EI 1538-7445 J9 CANCER RES JI Cancer Res. PD MAY 15 PY 1993 VL 53 IS 10 BP 2249 EP 2255 PG 7 WC Oncology SC Oncology GA LB957 UT WOS:A1993LB95700011 PM 8485710 ER PT J AU ABOLHASSANI, M PAVIA, CS DUNN, JJ CHIAO, JW AF ABOLHASSANI, M PAVIA, CS DUNN, JJ CHIAO, JW TI A MURINE IGG1 MONOCLONAL-ANTIBODY THAT BINDS SPECIFICALLY TO OUTER SURFACE PROTEIN-A OF LYME-DISEASE SPIROCHETE BORRELIA-BURGDORFERI SO FEMS MICROBIOLOGY LETTERS LA English DT Article DE LYME DISEASE; ANTI-OSPA; BORRELIA-BURGDORFERI ID LINKED IMMUNOSORBENT-ASSAY; REACTIVITY; TESTS; MICE AB A murine monoclonal antibody, designated MA-2G9, directed against outer surface protein A (OspA) of the Lyme disease spirochete, Borrelia burgdorferi, has been produced. Antibody MA-2G9, IgG1 subclass, was purified by affinity chromatography on protein G Sepharose column and used for purification of OspA antigen from Borrelia burgdorferi cell lysate. Epitope specificity was studied by Western immunoblotting, using several strains of B. burgdorferi and non-Lyme disease bacteria such as Treponema pallidum and B. hermsii. The MA-2G9 monoclonal antibody reacted specifically with recombinant OspA as well as with native OspA in sonicated B. burgdorferi strains. No reaction was observed with T pallidum, Escherichia coli, Staphylococcus aureus and B. hermsii lysates. The MA-2G9 antibody also recognized the denatured form of OspA indicating that it is directed against sequential epitope and not conformational epitope. C1 NEW YORK MED COLL,DEPT MED,207 VOSBURGH PAVIL,VALHALLA,NY 10595. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NCI NIH HHS [CA53628] NR 17 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1097 J9 FEMS MICROBIOL LETT JI FEMS Microbiol. Lett. PD MAY 15 PY 1993 VL 109 IS 2-3 BP 303 EP 309 DI 10.1016/0378-1097(93)90037-3 PG 7 WC Microbiology SC Microbiology GA LF599 UT WOS:A1993LF59900030 PM 8339920 ER PT J AU WOOD, BP AF WOOD, BP TI DISPLACEMENT CURRENT AND MULTIPLE-PULSE EFFECTS IN PLASMA SOURCE ION-IMPLANTATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SURFACE MODIFICATION; GEOMETRIES; MODEL AB In plasma source ion implantation (PSII), a target to be implanted is immersed in a weakly ionized plasma and pulsed to a high negative voltage. Plasma ions are accelerated toward the target and implanted in its surface. In this article, two factors in the analysis of these discharges are examined for the first time: (1) displacement current across the expanding sheath results in increased implant current and decreased implanted ion energy, with respect to existing models; and (2) ion depletion around the target due to high pulse repetition rates results in decreased implant current and dose. These effects are studied with analytic models and particle-in-cell simulations. Simulation results are compared to previously published PSII models. RP WOOD, BP (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,MS-E526,LOS ALAMOS,NM 87545, USA. NR 13 TC 64 Z9 66 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 MAY 15 PY 1993 VL 73 IS 10 BP 4770 EP 4778 DI 10.1063/1.353841 PN 1 PG 9 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100006 ER PT J AU JOHNSON, JB SOLIE, DJ BROWN, JA GAFFNEY, ES AF JOHNSON, JB SOLIE, DJ BROWN, JA GAFFNEY, ES TI SHOCK RESPONSE OF SNOW SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB We conducted gas-gun impact experiments on snow, with initial densities of 100-520 kg m-3 and at temperatures from -2 to -23-degrees-C and stress levels of 2-40 MPa. Carbon stress gauges were embedded in the snow to measure shock stress histories and arrival times. The unsteady and complex nature of the shock stresses necessitated the use of finite element and reverberation analysis techniques to determine the shock pressure-density (P-rho) relationships for snow. Experimental results indicate that variations in initial snow density are reflected in differences in the P-rho deformation path. The pressure needed to compact snow to a specific final density increases with lower initial density. Snow deformation was not affected by initial temperature, but was found to be strain rate dependent. Estimated release moduli increased nonlinearly from 50 MPa at a peak compression pressure of about 15 up to 2700 MPa at a peak pressure of about 40 MPa. Calculated stress histories and shock arrival times agreed with measured values within 20%. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. KTECH CORP INC,ALBUQUERQUE,NM 87110. RP JOHNSON, JB (reprint author), USA,COLD REG RES & ENGN LAB,BLDG 4070,FT WAINWRIGHT,AK 99703, USA. NR 21 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 4852 EP 4861 DI 10.1063/1.353801 PN 1 PG 10 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100019 ER PT J AU KIM, CG MORRIS, JW AF KIM, CG MORRIS, JW TI THE MECHANISM OF ELECTROMIGRATION FAILURE OF NARROW AL-2CU-1SI THIN-FILM INTERCONNECTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CONDUCTORS; DEPENDENCE; COPPER; DAMAGE; STRESS; LIFETIMES; MODEL; WIDTH AB This work is principally concerned with the microstructure of electromigration failure in narrow Al-2Cu-1Si conducting lines on Si. Samples were patterned from 0.5-mum-thick vapor-deposited films with mean grain size of 2.4 mum, and had linewidths of 1.3 mum (W/G almost-equal-to 0.5), 2 mum (W/G almost-equal-to 0.8), and 6 mum (W/G almost-equal-to 2.5). The lines were tested to failure at T=226-degrees-C and j=2.5X10(6) mu/cm2. Other samples were tested over a range of substrate temperatures and current densities to test the effect of these variables, and 1.3 mum lines were tested after preaging at 226-degrees-C for various times to change the Cu-precipitate distribution prior to testing. Three failure modes were observed: The 6 mum specimens failed by separation along grain boundaries with an apparent activation energy of 0.65 eV; the 1.3 mum specimens that were preaged for 24 h failed after very long times by gradual thinning to rupture; all other narrow lines failed by the transgranular-slit mechanism with an activation energy near 0.93 eV. Microstructural studies suggest that the transgranular-slit failure mechanism is due to the accumulation of a supersaturation of vacancies in the bamboo grains that terminate polygranular segments in the line. Failure occurs after Cu has been swept from the grain that fails. Failure happens first at the end of the longest polygranular segment of the line, at a time that decreases exponentially with the polygranular segment length. Preaging the line to create a more stable distribution of Cu lengthens the time required to sweep Cu from the longest polygranular segment, and significantly increases the time to failure. In the optimal case the transgranular-slit failure mechanism is suppressed, and the bamboo grain fails by diffuse thinning to rupture. Preaging is particularly effective in increasing the lifetimes of lines that contain very long polygranular segments, and has the consequence that the time to first failure in an array of lines is much longer than predicted by a log-normal fit to the distribution of failure times. C1 UNIV CALIF BERKELEY, DEPT MAT SCI, BERKELEY, CA 94720 USA. RP LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. NR 33 TC 32 Z9 32 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 4885 EP 4893 DI 10.1063/1.353806 PN 1 PG 9 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100024 ER PT J AU FLEETWOOD, DM WINOKUR, PS REBER, RA MEISENHEIMER, TL SCHWANK, JR SHANEYFELT, MR RIEWE, LC AF FLEETWOOD, DM WINOKUR, PS REBER, RA MEISENHEIMER, TL SCHWANK, JR SHANEYFELT, MR RIEWE, LC TI EFFECTS OF OXIDE TRAPS, INTERFACE TRAPS, AND BORDER TRAPS ON METAL-OXIDE-SEMICONDUCTOR DEVICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RADIATION-INDUCED CHARGE; FIELD-EFFECT TRANSISTORS; THERMALLY STIMULATED CURRENTS; ELECTRON-SPIN-RESONANCE; SILICON DIOXIDE FILMS; GATE MOS DEVICES; 1/F NOISE; SI-SIO2 INTERFACE; POSITIVE CHARGE; 100 SILICON AB We have identified several features of the 1/f noise and radiation response of metal-oxide-semiconductor (MOS) devices that are difficult to explain with standard defect models. To address this issue, and in response to ambiguities in the literature, we have developed a revised nomenclature for defects in MOS devices that clearly distinguishes the language used to describe the physical location of defects from that used to describe their electrical response. In this nomenclature, ''oxide traps'' are simply defects in the SiO2 layer of the MOS structure, and ''interface traps'' are defects at the Si/SiO2 interface. Nothing is presumed about how either type of defect communicates with the underlying Si. Electrically, ''fixed states'' are defined as trap levels that do not communicate with the Si on the time scale of the measurements, but ''switching states'' can exchange charge with the Si. Fixed states presumably are oxide traps in most types of measurements, but switching states can either be interface traps or near-interfacial oxide traps that can communicate with the Si, i.e., ''border traps'' [D. M. Fleetwood, IEEE Trans. Nucl. Sci. NS-39, 269 (1992)]. The effective density of border traps depends on the time scale and bias conditions of the measurements. We show the revised nomenclature can provide focus to discussions of the buildup and annealing of radiation-induced charge in non-radiation-hardened MOS transistors, and to changes in the 1/f noise of MOS devices through irradiation and elevated-temperature annealing. Border-trap densities of approximately 10(10)-10(11) cm-2 are inferred from changes in switching-state density during postirradiation annealing, and from a simple trapping model of the 1/f noise in MOS devices. We also present a detailed study of charge buildup and annealing in MOS capacitors with radiation-hardened oxides through steady-state and switched-bias postirradiation annealing. Trapped-hole, trapped-electron, and switching-state densities are inferred via thermally stimulated current and capacitance-voltage measurements. A lower bound of approximately 3 X 10(11) cm-2 is estimated for the effective density of border traps that contribute to the electrical response of the irradiated devices. This is roughly 20% of the observed switching-state density for these devices and irradiation conditions. To our knowledge, this represents the first quantitative separation of measured switching-state densities into border-trap and interface-trap components. Possible physical models of border traps are discussed. E' centers in SiO2 (trivalent Si centers associated with oxygen vacancies) may serve as border traps in many irradiated MOS devices. RP FLEETWOOD, DM (reprint author), SANDIA NATL LABS,DEPT 1332,ALBUQUERQUE,NM 87185, USA. NR 123 TC 266 Z9 268 U1 8 U2 106 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 MAY 15 PY 1993 VL 73 IS 10 BP 5058 EP 5074 DI 10.1063/1.353777 PN 1 PG 17 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100048 ER PT J AU DELONG, MC MOWBRAY, DJ HOGG, RA SKOLNICK, MS HOPKINSON, M DAVID, JPR TAYLOR, PC KURTZ, SR OLSON, JM AF DELONG, MC MOWBRAY, DJ HOGG, RA SKOLNICK, MS HOPKINSON, M DAVID, JPR TAYLOR, PC KURTZ, SR OLSON, JM TI PHOTOLUMINESCENCE, PHOTOLUMINESCENCE EXCITATION, AND RESONANT RAMAN-SPECTROSCOPY OF DISORDERED AND ORDERED GA0.52IN0.48P SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID VAPOR-PHASE EPITAXY; BAND-GAP; GROWTH TEMPERATURE; OPTICAL PHONONS; SCATTERING; GAAS; SEMICONDUCTORS; RECOMBINATION; GA0.5IN0.5P; DEPENDENCE AB Ordering in the CuPt structure is known to significantly reduce the band gap of Ga0.52In0.48P as well as induce a number of unusual details in its optical properties, including long, excitation-intensity-dependent lifetimes and an excitation-intensity-dependent emission energy. We report photoluminescence (PL), photoluminescence excitation (PLE), and resonant Raman measurements performed on ordered and disordered Ga0.52In0.48P. The dominant high energy emission process at low temperature in disordered Ga0.52In0.48P is established to be excitonic, but the exciton trapping energy is not unique. PLE from ordered Ga0.52In0.48P shows significant tailing of electronic states into the band gap and a ''band edge' which depends on detection energy. The dominant radiative process in ordered Ga0.52In0.48P is not excitonic. A large increase in the Stokes shift between the absorption edge (band gap) and PL emission peak occurs when the material orders. Hence, low temperature PL is determined to be a particularly poor measure of band gap. Resonant Raman scattering is used to study optical phonons and their coupling to electronic states. We find that the resonance enhancement at the band edge occurs via localized excitons. C1 UNIV SHEFFIELD,DEPT ELECTR & ELECT ENGN,SERC CENT FACIL III V MAT,SHEFFIELD S1 4DU,ENGLAND. UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP DELONG, MC (reprint author), UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. RI Hogg, Richard/D-4925-2009; Hopkinson, Mark/H-8239-2012; Skolnick, Maurice/G-7250-2016; OI Hogg, Richard/0000-0002-0781-6809; Skolnick, Maurice/0000-0002-3972-8344; Hopkinson, Mark/0000-0002-8097-6913 NR 36 TC 76 Z9 79 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5163 EP 5172 DI 10.1063/1.353792 PN 1 PG 10 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100063 ER PT J AU MARUYAMA, T GARWIN, EL MAIR, RA PREPOST, R SMITH, JS WALKER, JD AF MARUYAMA, T GARWIN, EL MAIR, RA PREPOST, R SMITH, JS WALKER, JD TI ELECTRON-SPIN POLARIZATION IN PHOTOEMISSION FROM THIN ALXGA1-XAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM-EPITAXY; LARGE ENHANCEMENT; GAAS AB The polarization of photoemitted electrons from thin AlxGa1-xAs layers grown by molecular-beam epitaxy has been studied as a function of Al concentration by varying x in steps of 0.05 from 0.0 to 0.15. As the fraction x is increased, the wavelength dependence of the polarization shifts toward shorter wavelengths, permitting wavelength tuning of the region of maximum polarization. A maximum electron polarization of 42%-43% is obtained for AlxGa1-xAs samples with x greater-than-or-equal-to 0.05 while the maximum polarization of GaAs (x=0) samples reaches 49%. To investigate the lower polarization of AlxGa1-xAs, additional samples have been studied, including a short-period superlattice (GaAs)7 - (AlAs)1. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,ELECTR RES LAB,BERKELEY,CA 94720. RP MARUYAMA, T (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 22 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5189 EP 5192 DI 10.1063/1.353744 PN 1 PG 4 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100068 ER PT J AU AUCIELLO, O MANTESE, L DUARTE, J CHEN, X ROU, SH KINGON, AI SCHREINER, AF KRAUSS, AR AF AUCIELLO, O MANTESE, L DUARTE, J CHEN, X ROU, SH KINGON, AI SCHREINER, AF KRAUSS, AR TI SYNTHESIS AND CHARACTERIZATION OF PB (ZRXTI1-X)O3 THIN-FILMS PRODUCED BY AN AUTOMATED LASER ABLATION DEPOSITION TECHNIQUE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PZT CERAMICS; SUPERCONDUCTIVITY; MEMORIES; SYSTEM AB Ferroelectric lead zirconium titanate [Pb (ZrxTi1-x)O3] (PZT) thin films have been synthesized by using an automated laser ablation deposition technique with a capability for layer-by-layer or simultaneous deposition of elemental film constituents. The technique is suitable for producing multicomponent and/or multilayered thin films with controlled stoichiometry, such as high-temperature superconductor, ferroelectric, and electro-optic thin films. PZT films were synthesized on MgO (100) by either sequential deposition of layers of ZrO2, TiO2, and PbO, produced by laser ablation of ZrO2, TiO2, and PbO targets, or by simultaneous deposition of all species from ablation of stoichiometric or PbO-rich PZT targets. Films were deposited at 200-degrees-C and subsequently annealed at 600-degrees-C for different periods of time. The orientation, microstructure, surface topography, and composition of the films were characterized by x-ray diffraction, transmission electron microscopy, scanning electron microscopy, and Rutherford backscattering spectrometry, respectively. As-deposited layer films consists of highly oriented (001) PbO layers, from which highly oriented (110) PZT films are produced after postdeposition annealing. On the other hand, laser ablation of bulk PZT targets yields amorphous as-deposited films, which evolve into highly oriented (100) PZT films after postdeposition annealing. Preliminary electrical characterization of the PZT films included polarization hysteresis, fatigue, conductivity (ac and dc), and capacitance versus voltage measurements. From the initial electrical measurements, it appears that the remnant polarization of the layered PZT films is similar to that of the films produced by laser ablation of bulk PZT targets. C1 N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP AUCIELLO, O (reprint author), MCNC,CTR MICROELECTR SYST TECHNOL,3021 CORNWALLIS RD,RES TRIANGLE PK,NC 27709, USA. NR 40 TC 52 Z9 52 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 MAY 15 PY 1993 VL 73 IS 10 BP 5197 EP 5207 DI 10.1063/1.353746 PN 1 PG 11 WC Physics, Applied SC Physics GA LD851 UT WOS:A1993LD85100070 ER PT J AU BERKOWITZ, AE MITCHELL, JR CAREY, MJ YOUNG, AP RAO, D STARR, A ZHANG, S SPADA, FE PARKER, FT HUTTEN, A THOMAS, G AF BERKOWITZ, AE MITCHELL, JR CAREY, MJ YOUNG, AP RAO, D STARR, A ZHANG, S SPADA, FE PARKER, FT HUTTEN, A THOMAS, G TI GIANT MAGNETORESISTANCE IN HETEROGENEOUS CU-CO AND AG-CO ALLOY-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC AB Giant magnetoresistance in sputtered single films of Cu-Co and Ag-Co heterogeneous alloys is discussed. The films consist of Co-rich precipitates in a nonferromagnetic matrix. The Ag-Co films have higher DELTArho/rho and DELTArho values than the Cu-Co films, possibly due to less Co dissolved in the Ag matrix. DELTArho scales inversely with precipitate particle size, implying that Co-rich clusters less-than-or-equal-to 20 angstrom diameter may be most effective for spin dependent scattering. This trend of the data and a phenomenological model suggest that interfacial spin dependent scattering is significantly stronger than the scattering within the Co-rich particles. C1 UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES,SAN DIEGO,CA 92103. NYU,DEPT PHYS,NEW YORK,NY 10003. LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP BERKOWITZ, AE (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,SAN DIEGO,CA 92103, USA. RI Hutten, Andreas/B-3524-2011; Zhang, Shufeng/G-7833-2011 NR 17 TC 118 Z9 119 U1 1 U2 4 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 MAY 15 PY 1993 VL 73 IS 10 BP 5320 EP 5325 DI 10.1063/1.353767 PN 2A PG 6 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400004 ER PT J AU LACERDA, A MOVSHOVICH, R HUNDLEY, MF CANFIELD, PC ARMS, D SPARN, G THOMPSON, JD FISK, Z FISHER, RA PHILLIPS, NE OTT, HR AF LACERDA, A MOVSHOVICH, R HUNDLEY, MF CANFIELD, PC ARMS, D SPARN, G THOMPSON, JD FISK, Z FISHER, RA PHILLIPS, NE OTT, HR TI DOPING AND PRESSURE STUDIES ON YBBIPT SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID TEMPERATURE AB The compound YbBiPt exhibits an extremely large low-temperature C/T (gamma approximately 8 J K-2 mol-1/Yb) which, if due solely to a renormalized effective mass, would make this material the heaviest correlated electron system known to date. In the Kondo model, the very large gamma corresponds to a small characteristic energy scale that is expected to be pressure dependent. We have studied the effect of chemical pressure on YbBiPt single crystals by heat-capacity measurements on Y and Lu-doped samples. We have also made preliminary low-temperature measurements under hydrostatic pressure of the heat capacity (300 mK < T < 2 K, up to 8 kbar) and resistance (30 mK < T < 1 K, at 16 kbar). C1 ETH ZURICH,ZURICH,SWITZERLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Sparn, Guenter/F-5120-2013; Canfield, Paul/H-2698-2014 NR 13 TC 2 Z9 2 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5415 EP 5417 DI 10.1063/1.353700 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400043 ER PT J AU KIOUSSIS, N YU, HJ COOPER, BR SHENG, QG WILLS, JM AF KIOUSSIS, N YU, HJ COOPER, BR SHENG, QG WILLS, JM TI ANISOTROPIC MAGNETISM IN HYBRIDIZING URANIUM SYSTEMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID NEUTRON-SCATTERING; CERIUM; SPIN; MONOPNICTIDES; EXCITATIONS; BAND AB The isostructural uranium monopnictides and monochalcogenides have become Prototype systems in actinide research with respect to their unusual magnetic properties. We have investigated the origins in the electronic structure of the variation in magnetic behavior as the degree of 5f-electron localization changes from localized to itinerant on going up the pnictogen or chalcogen column, thus decreasing the U-U separation. We have applied a synthesis of: (1) A phenomenological theory of orbitally driven magnetic ordering which includes both the hybridization-induced and the RKKY exchange interactions on an equal footing, and (2) Ab initio electronic structure calculations, based on the linear-muffin-tin-orbital method, allowing a first-principles evaluation of the parameters entering the model Hamiltonian. We have investigated systematically characteristic trends and changes of the 5f-state resonance width, the hybridization potential, and the hybridization-induced and RKKY exchange interactions with chemical environment, on going down the pnictogen or chalcogen column and on going from the weakly hybridizing pnictides to the more strongly hybridizing chalcogenides. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KIOUSSIS, N (reprint author), CALIF STATE UNIV NORTHRIDGE,DEPT PHYS,NORTHRIDGE,CA 91330, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5424 EP 5426 DI 10.1063/1.353703 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400046 ER PT J AU CABLE, JW TSUNODA, Y AF CABLE, JW TSUNODA, Y TI SPIN-DENSITY WAVES IN DILUTE CUMN ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID NEUTRON-POLARIZATION-ANALYSIS; GLASSES AB Neutron scattering studies on concentrated CuMn alloys show static spin density waves (SDW) that are incommensurate with the lattice and which become dynamic above the freezing temperature T(f) with a dispersion relation that is essentially vertical. The existence of both the static and the dynamic SDW in dilute CuMn alloys where the Mn atoms may be separated beyond the range of SDW stability was examined. There is no such cutoff range in the Overhauser SDW model where the transition temperature is simply linear with concentration, but a recent calculation by Ioffe and Feigel'man gives magnetic order that does depend on an interaction range and the density of spins on the lattice. For CuMn alloys, they obtain spin-glass ordering at low Mn concentration with a crossover to short-range helical order near 10% Mn. Our neutron scattering measurements were made on single crystals of CuMn alloys containing 1.4% and 3.0% Mn. Elastic scans along [1zeta0] at temperatures well below T(f) yield the same type of intensity distribution as that previously observed for the more concentrated alloys and show the existence of static SDW at dilutions down to 1.4% Mn. Inelastic scans in the same Q region for the Cu-3% Mn alloy clearly show the presence of dynamic SDW at temperatures up to T/T(f) = 7.5. These results favor the SDW model of Overhauser as the best description of the magnetic order in dilute CuMn alloys. C1 OSAKA UNIV,TOYONAKA,OSAKA 560,JAPAN. RP CABLE, JW (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 10 TC 8 Z9 8 U1 2 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 MAY 15 PY 1993 VL 73 IS 10 BP 5454 EP 5456 DI 10.1063/1.353716 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400059 ER PT J AU SEN, S LONG, M FLORENCIO, J CAI, ZX AF SEN, S LONG, M FLORENCIO, J CAI, ZX TI A UNIQUE FEATURE OF SOME SIMPLE MANY-BODY QUANTUM SPIN SYSTEMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SURFACE-SPIN; XY-CHAIN; RELAXATION; MODEL AB Dynamical correlations in simple quantum spin models can be conveniently studied via the continued fraction formalism in which the Laplace transformed dynamical two-point correlation can be written as C(z) = 1/(z + DELTA1/(x + DELTA2/(Z + ..to infinity))), where DELTA(n)'s are functions of static correlations. Very often, for systems without any natural dominant characteristic frequencies, as n increases, DELTA(n) almost-equal-to kappan(alpha), a = 0 or 1, kappa being some constant, for large n for simple quantum spin systems. It is suggested that this property of DELTA(n)'s could be related to some underlying ''nearly noninteracting fermionic nature'' of these quantum spin systems. C1 UNIV GEORGIA, DEPT PHYS, ATHENS, GA 30602 USA. PENN STATE UNIV, DEPT PHYS, ALTOONA, PA 16601 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP MICHIGAN STATE UNIV, DEPT PHYS, E LANSING, MI 48824 USA. NR 23 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5471 EP 5473 DI 10.1063/1.353669 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400065 ER PT J AU DEVINE, MK JILES, DC EICHMANN, AR KAMINSKI, DA HARDWICK, S AF DEVINE, MK JILES, DC EICHMANN, AR KAMINSKI, DA HARDWICK, S TI MAGNESCOPE - APPLICATIONS IN NONDESTRUCTIVE EVALUATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID STEEL; STRESS AB This paper describes recent results obtained with the Magnescope, which has been used on location in industrial environments and has successfully detected impending fatigue failure, creep damage, applied stress, and microstructural differences. It is concluded that the device provides a useful nondestructive method for evaluating the mechanical properties of materials through the measurement of their structure sensitive magnetic properties. C1 IOWA STATE UNIV SCI & TECHNOL,CTR ADV TECHNOL DEV,AMES,IA 50011. UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. RP DEVINE, MK (reprint author), AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 12 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5617 EP 5619 DI 10.1063/1.353615 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400119 ER PT J AU CHEN, ZJ DEVINE, MK JILES, DC AF CHEN, ZJ DEVINE, MK JILES, DC TI MEASUREMENTS OF MAGNETIC-CIRCUIT CHARACTERISTICS FOR COMPREHENSION OF INTRINSIC MAGNETIC-PROPERTIES OF MATERIALS FROM SURFACE INSPECTION SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC AB A transfer function is presented for calculating magnetic field and flux density inside a test material as a result of surface measurement. By considering flux leakage, we introduce a parameter eta, called the leakage coefficient, which can be experimentally determined. It is introduced into the equations to make the transfer function more practical. The distribution of field inside a test material is then discussed in accordance with a surface magnetic charge model. RP CHEN, ZJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 5 TC 4 Z9 4 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5620 EP 5622 DI 10.1063/1.353616 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400120 ER PT J AU SIPAHI, LB JILES, DC CHANDLER, D AF SIPAHI, LB JILES, DC CHANDLER, D TI COMPREHENSIVE ANALYSIS OF BARKHAUSEN EMISSION-SPECTRA USING PULSE-HEIGHT ANALYSIS, FREQUENCY-SPECTRUM, AND PULSE-WAVE FORM ANALYSIS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID NOISE; STEEL AB The dependence of magnetic Barkhausen emissions (MBE) upon both field excitation and detection frequencies and excitation wave form was studied in order to investigate two of several crucial factors which affect the emissions. Sinusoidal, triangular, and square wave forms were used to generate the MBE and the pulse height spectra, frequency spectra, and pulse wave forms of these signals were analyzed. The frequency spectra of sinusoidal and triangular alternating field excitations showed similar behavior but the spectrum under square wave excitation was different due to the existence of high frequency components during square wave switching. As yet, no common standard has been agreed upon for parameterization and representation of Barkhausen signals. It appears from this work that field excitation wave form and frequency should define the inputs, while detection frequency range, pulse height spectrum, frequency spectrum, and emitted pulse wave form analysis should be used to quantify the output. C1 IOWA STATE UNIV SCI & TECHNOL,CTR NONDESTRUCT EVALUAT,AMES,IA 50011. AMES LAB,CTR NONDESTRUCT EVALUAT,DEPT MAT SCI & ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN,AMES,IA 50011. RP SIPAHI, LB (reprint author), AMES LAB,DEPT PHYS,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 14 TC 14 Z9 14 U1 0 U2 4 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 MAY 15 PY 1993 VL 73 IS 10 BP 5623 EP 5625 DI 10.1063/1.353617 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400121 ER PT J AU CHUNG, R WEBER, R JILES, DC AF CHUNG, R WEBER, R JILES, DC TI THE MAGNETOSTRICTIVE LASER-DIODE MAGNETOMETER FOR PERSONAL MAGNETIC-FIELD DOSIMETRY SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP CHUNG, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5638 EP 5638 DI 10.1063/1.353623 PN 2A PG 1 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400127 ER PT J AU ZYSLER, RD BUTERA, A FAINSTEIN, A TOVAR, M FISK, Z AF ZYSLER, RD BUTERA, A FAINSTEIN, A TOVAR, M FISK, Z TI DC MAGNETIZATION MEASUREMENTS IN EU2CUO4GD3+ SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID GD2CUO4 CRYSTALS; ND2CUO4 AB dc magnetization measurements in a Gd doped Eu2CuO4 single crystal indicate the appearance below T(N)=243 K, of a weak ferromagnetic component M(s)(T), in addition to the Van Vleck paramagnetism of the Eu3+ ions. M(s)(T) is oriented parallel to the (001) plane and its magnitude and in-plane angular dependence are strongly dependent on the cooling conditions. For samples cooled in zero magnetic field the magnetization is isotropic in the (001) plane with M(s)(0)=2.2 (4) X 10(-3) mu(B)/formula unit. For samples cooled in a field (FC), M(s)(T) increases as a function of the field applied for cooling, H(FC), reaching M(s)(0) = 5.0(5) X 10(-3) mu(B)/formula unit for H(FC)=10 kG. A uniaxial magnetic anisotropy develops in this case with an easy axis along the [110] crystallographic direction lying closer to the orientation of H(FC). A magnetic free energy including second and fourth order in-plane anisotropy terms provides a good description of the experimental results, with H(2)=-85(5) G and H(4)=10(3) G. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. INST BALSEIRO,RA-8400 BARILOCHE,ARGENTINA. RP ZYSLER, RD (reprint author), CTR ATOM BARILOCHE,RA-8400 BARILOCHE,ARGENTINA. NR 14 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5680 EP 5682 DI 10.1063/1.353589 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400147 ER PT J AU STEREN, LB FAINSTEIN, A TOVAR, M ROUCO, A PEREZ, F OBRADORS, X MIRA, J RIVAS, J OSEROFF, SB FISK, Z AF STEREN, LB FAINSTEIN, A TOVAR, M ROUCO, A PEREZ, F OBRADORS, X MIRA, J RIVAS, J OSEROFF, SB FISK, Z TI WEAK FERROMAGNETISM INDUCED BY THE EXTERNAL-FIELD ABOVE TN IN GDZCUO4 SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID MAGNETIC-PROPERTIES; GD2CUO4 AB A detailed study of the temperature and field dependence of the dc magnetization near the antiferromagnetic (AF) transition in Gd2CuO4 shows the presence of field-induced weak ferromagnetism (WF) well above the Neel temperature T(N). ac susceptibility measurements indicate T(N)=266(3) and 282(3) K, for single crystals and ceramic samples, respectively. The shift of the electron-spin-resonance line of the Gd3+ ions as a function of temperature T, deltaH(r)(T), is compared with the static internal field H(i)(T), which describes the coupling between the paramagnetic Gd lattice and the WF component of the Cu moments. Both deltaH(i)(T) and H(i)(T) show that the WF persists up to almost-equal-to 50 K above T(N). The initial susceptibility (for H < 100 G) presents a contribution in excess of the paramagnetism of Gd ions. For T greater-than-or-equal-to T(N), it decays as K(T-T(N))-1, with K=0.20(3) emu K mol. The relationship between this result and the strong two-dimensional AF correlations in these cuprates is discussed. C1 INST CIENCIA MAT BARCELONA,E-08193 BARCELONA,SPAIN. UNIV SANTIAGO,COMIS NACL ENERGIA ATOM,CTR ATOM BARILOCHE,RA-8400 BARILOCHE,ARGENTINA. SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP STEREN, LB (reprint author), COMIS NACL ENERGIA ATOM,CTR ATOM BARILOCHE,RA-8400 BARILOCHE,ARGENTINA. RI Obradors, Xavier/A-8146-2012; Mira, Jorge/F-9077-2016; OI Mira, Jorge/0000-0002-6024-6294; Rivas, Jose/0000-0002-5059-3196 NR 11 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5710 EP 5712 DI 10.1063/1.353599 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400157 ER PT J AU QIU, ZQ PEARSON, J BADER, SD AF QIU, ZQ PEARSON, J BADER, SD TI MAGNETIC COUPLING OF FE/MO/FE AND CO/CU/CO SANDWICHES ACROSS WEDGED SPACER LAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID EXCHANGE; MAGNETORESISTANCE; OSCILLATIONS; SUPERLATTICES; PERIOD AB Fe/Mo/Fe and Co/Cu/Co sandwiches were grown by molecular beam epitaxy onto Mo(100) and Cu(100) single crystals, respectively, and characterized by high- and low-energy electron diffraction and in situ surface magneto-optic Kerr-effect measurements. The spacer layer in both case was fabricated to have a wedged shape in order to create a continuous change of the spacer-layer thickness. Oscillatory behavior between ferromagnetic and antiferromagnetic coupling was found; and is shown to originate at the interface between the magnetic layer and the spacer layer. For Fe/Mo/Fe, short-period oscillations are observed with a periodicity of approximately 3 ML of Mo. Hysteresis loops for antiferromagnetically coupled cases are calculated from a simple model, and the results reproduce the general characteristics observed experimentally. RP QIU, ZQ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Qiu, Zi Qiang/O-4421-2016 OI Qiu, Zi Qiang/0000-0003-0680-0714 NR 27 TC 13 Z9 17 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5765 EP 5770 DI 10.1063/1.353568 PN 2A PG 6 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400179 ER PT J AU JILES, DC SIPAHI, LB WILLIAMS, G AF JILES, DC SIPAHI, LB WILLIAMS, G TI MODELING OF MICROMAGNETIC BARKHAUSEN ACTIVITY USING A STOCHASTIC-PROCESS EXTENSION TO THE THEORY OF HYSTERESIS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID FERROMAGNETIC MATERIALS AB Recent work by Bertotti [IEEE Trans. Magn. MAG-24, 621 (1988)] and others has shown that it is possible to model the micromagnetic Barkhausen discontinuities at the coercive point using a two-parameter stochastic model. However, the present formulation of the model is restricted to limited regions of the hysteresis curve over which dM/dH is approximately constant and when dH/dt is held at a constant rate. A natural extension of this model is to take the basic result, in which the level of Barkhausen activity in one time period is related to the activity in the previous time period, and increment it by a small amount which is dependent on the differential permeability. The extension of the model proposed here uses the theory of ferromagnetic hysteresis to determine the differential permeability at any point of the hysteresis loop. The Barkhausen activity is then assumed to vary in proportion to the differential permeability. The resulting model allows the Barkhausen sum of discontinuous changes in magnetization to be modelled around the entire hysteresis loop, leading to an important generalization of the basic model. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN,AMES,IA 50011. RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,DEPT MAT SCI & ENGN,CTR NONDESTRUCT EVALUAT,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 9 TC 28 Z9 28 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5830 EP 5832 DI 10.1063/1.353541 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400203 ER PT J AU JILES, DC AF JILES, DC TI PHYSICAL INTERPRETATION OF THE HYSTERESIS PARAMETERS IN THE THEORY OF HYSTERESIS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 1 TC 7 Z9 7 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5854 EP 5854 DI 10.1063/1.353549 PN 2A PG 1 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400211 ER PT J AU MOOK, HA YETHIRAJ, M WIGNALL, GD FORGAN, EM LEE, SL CUBITT, R PAUL, DM ARMSTRONG, T AF MOOK, HA YETHIRAJ, M WIGNALL, GD FORGAN, EM LEE, SL CUBITT, R PAUL, DM ARMSTRONG, T TI NEUTRON MEASUREMENTS OF THE VORTEX LATTICE IN YBA2CU3O7 SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID SUPERCONDUCTORS; GLASS AB Neutron diffraction has been used to measure the vortex lattice scattering for YBa2Cu3O7. A square pattern is found when the field is applied along the c axis, while a triangular pattern is found when the field is applied well away from the c axis. High-resolution measurements for the square pattern show that the vortex lattice has long-range orientational order but only short-range positional order. The temperature dependence of the penetration depth is not that expected for a superconductor with a conventional s-wave BCS-type gap. Preliminary measurements for temperatures near the irreversibility line are consistent with the occurrence of melting of the vortex lattice or glass phase. C1 UNIV BIRMINGHAM,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. UNIV WARWICK,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. ALLIED SIGNAL CORP,TORRANCE,CA 90509. RP MOOK, HA (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI cubitt, robert/B-9408-2008; Lee, Stephen/G-9791-2016 OI Lee, Stephen/0000-0002-2020-3310 NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5855 EP 5859 DI 10.1063/1.353551 PN 2A PG 5 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400213 ER PT J AU PAPPAS, DP WADDILL, GD TOBIN, JG AF PAPPAS, DP WADDILL, GD TOBIN, JG TI MAGNETIC DICHROISM IN CORE-LEVEL PHOTOEMISSION FROM FE/CU(100) FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID FCC-FE FILMS; CIRCULAR-DICHROISM; EPITAXIAL-FILMS; SURFACE; CU(100); CU AB Circularly polarized x rays from a synchrotron light source were used in photoemission from thin fcc Fe films on Cu(100). The measured exchange splitting for the 3s and 2p levels in these films is reduced from that measured in bulk bec Fe. For both the 2p3/2 and the 2p1/2 levels the splittings are about half that of bulk bcc Fe. This trend is in line with measurements of the 3s exchange splitting from fcc Fe compared to bcc Fe as well. A 0.25 eV exchange splitting is observed in the 3p core level. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PAPPAS, DP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Tobin, James/O-6953-2015 NR 18 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5936 EP 5938 DI 10.1063/1.353527 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400242 ER EF