FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Semlitsch, RD Gibbons, JW Tuberville, TD AF Semlitsch, RD Gibbons, JW Tuberville, TD TI Timing of reproduction and metamorphosis in the Carolina gopher frog (Rana capito capito) in South Carolina SO JOURNAL OF HERPETOLOGY LA English DT Note C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP Semlitsch, RD (reprint author), UNIV MISSOURI,DIV BIOL SCI,COLUMBIA,MO 65211, USA. NR 11 TC 15 Z9 17 U1 3 U2 12 PU SOC STUD AMPHIBIANS REPTILES PI OXFORD PA DEPT OF ZOOLOGY MIAMI UNIV, OXFORD, OH 45056 SN 0022-1511 J9 J HERPETOL JI J. Herpetol. PD DEC PY 1995 VL 29 IS 4 BP 612 EP 614 DI 10.2307/1564746 PG 3 WC Zoology SC Zoology GA TK758 UT WOS:A1995TK75800015 ER PT J AU KOVALAINEN, JT MORIMOTO, H WILLIAMS, PG VEPSALAINEN, JV REIJONEN, K GYNTHER, J AF KOVALAINEN, JT MORIMOTO, H WILLIAMS, PG VEPSALAINEN, JV REIJONEN, K GYNTHER, J TI SYNTHESIS OF A TRITIUM-LABELED ANTIHISTAMINIC DRUG [H-3] N,N-DIETHYL-2-[4-(PHENYLAMETHYL)PHENOXY]-ETHANEAMINE-CENTER-DOT-HCL SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE TRITIUM; ANTIHISTAMINE; HISTAMINE; H-IC RECEPTOR; PLATELETS ID ANTIESTROGEN BINDING-SITE; HISTAMINE; RECEPTOR AB A tritium labelled antihistamine, N,N-diethyl-2-[4-(phenyl- methyl)phenoxy]-ethaneamine . HCl (DPPE, 4) was synthesized to investigate its binding intracellular histamine receptors (H-IC) and for further studies with specific ligands of H-IC to determine their potential effects on cell proliferation. A palladium catalyzed reduction of an activated carbonyl between the two phenyl groups of N,N-diethyl-2-[4-(benzoyl)phenoxy]-ethaneamine . HCl (DBPE, 3) with 100% tritium gas was successful where 55% of the theoretical activity (specific activity 31.6 Ci/mmol) was obtained. C1 LAWRENCE BERKELEY LAB,NATL TRITIUM LABELING FACIL,BERKELEY,CA 94720. UNIV KUOPIO,DEPT CHEM,SF-70211 KUOPIO,FINLAND. RP KOVALAINEN, JT (reprint author), UNIV KUOPIO,DEPT PHARMACEUT CHEM,POB 1627,SF-70211 KUOPIO,FINLAND. NR 11 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0362-4803 J9 J LABELLED COMPD RAD JI J. Label. Compd. Radiopharm. PD DEC PY 1995 VL 36 IS 12 BP 1147 EP 1156 DI 10.1002/jlcr.2580361205 PG 10 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical; Pharmacology & Pharmacy SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA TG186 UT WOS:A1995TG18600003 ER PT J AU Lewis, GK Cremers, DA AF Lewis, GK Cremers, DA TI Overview of laser technology at Los Alamos National Laboratory SO JOURNAL OF LASER APPLICATIONS LA English DT Article C1 LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. RP Lewis, GK (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU LASER INST AMER PI ORLANDO PA 12424 RESEARCH PARKWAY SUITE 125, ORLANDO, FL 32826 SN 1042-346X J9 J LASER APPL JI J. Laser Appl. PD DEC PY 1995 VL 7 IS 4 BP 224 EP 228 PG 5 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA TM113 UT WOS:A1995TM11300008 ER PT J AU Tribble, DL Chu, BM Gong, EL vanVenrooij, F Nichols, AV AF Tribble, DL Chu, BM Gong, EL vanVenrooij, F Nichols, AV TI HDL antioxidant effects as assessed using a nonexchangeable probe to monitor particle-specific peroxidative stress in LDL-HDL mixtures SO JOURNAL OF LIPID RESEARCH LA English DT Article DE parinaric acid; cholesteryl ester; lipid peroxidation; conjugated diene formation; Cu2+-induced peroxidation; Fe3+-induced peroxidation ID LOW-DENSITY-LIPOPROTEIN; HUMAN-ERYTHROCYTE-MEMBRANES; CIS-PARINARIC ACID; LIPID-PEROXIDATION; OXIDATIVE MODIFICATION; PLASMA-LIPOPROTEINS; A-I; FLUORESCENCE; INHIBITION AB High density lipoproteins (HDL) have been reported to inhibit oxidation of low density lipoproteins (LDL) based in part on observations that oxidative changes occur more slowly in LDL-HDL mixtures than in LDL alone. In the current studies, we developed an approach to discern particle-specific oxidation kinetics within mixed particle systems using the oxidation-labile fluorescent probe parinaric acid cholesteryl ester (PnCE) and applied this to the study of HDL inhibition effects. PnCE was introduced into acceptor lipoproteins by cholesteryl ester transfer protein (CETP)-mediated transfer from donor microemulsions. Incubation of PnCE-containing LDL and HDL with non-probe-containing HDL and LDL, respectively, followed by measurement of reisolated fractions, indicated that PnCE does not transfer appreciably between lipoprotein fractions. Oxidative loss of lipoprotein-associated PnCE occurred essentially in tandem with changes in conjugated dienes, suggesting that PnCE loss reflects the course of peroxidation of endogenous lipoprotein lipids. Using PnCE to separately monitor LDL- and HDL-specific oxidation within LDL-HDL mixtures, we obtained direct evidence that HDL inhibits both Cu2+- and Fe3+-induced peroxidation of LDL-associated lipids. Notably, in the presence of Cu2+, loss of HDL-associated PnCE fluorescence also was inhibited in LDL-HDL co-incubations, suggesting that LDL exert an antioxidant effect under these conditions as well. Thus, results obtained using this new methodology are consistent with previously reported antioxidant effects of HDL, but indicate that the behavior of individual lipoprotein particles may be more complicated than can be predicted the collective behavior of the lipoprotein mixture. RP Tribble, DL (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT MOLEC & NUCL MED,DIV LIFE SCI,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL46281] NR 29 TC 22 Z9 22 U1 0 U2 0 PU LIPID RESEARCH INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0022-2275 J9 J LIPID RES JI J. Lipid Res. PD DEC PY 1995 VL 36 IS 12 BP 2580 EP 2589 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA UC117 UT WOS:A1995UC11700011 PM 8847484 ER PT J AU Snow, WM Sokol, PE AF Snow, WM Sokol, PE TI Density and temperature dependence of the momentum distribution in liquid helium .4. SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID INELASTIC NEUTRON-SCATTERING; CONDENSATE FRACTION; IMPULSE APPROXIMATION; SUPERFLUID HE-4; ELEMENTARY EXCITATIONS; QUANTUM LIQUIDS; STATE AB Deep inelastic neutron scattering measurements on liquid He-4 have been carried out for temperatures from 0.35 K to 4.2 K and densities from 0.125 to 0.200 g/cm(3) at a momentum transfer of 23 Angstrom(-1). These measurements are at large enough momentum transfer that deviations from the Impulse Approximation are accurately described by current theories and information on the single particle momentum distribution may be extracted front the measured scattering. The scattering exhibits non-Gausian behavior in both the normal liquid and superfluid phases. A distinct change in the scattering, marked by a reduction in the width and increased deviations from the classical Gaussian shape, occurs at the superfluid transition. We present a comparison of our experimental results with recent calculations at a variety of temperatures and densities and show that theory and experiment are in excellent agreement. We also present model scattering functions, obtained by correcting for instrumental resolution and final state effects, that represent the scattering in the IA limit. Finally, we present values for the average kinetic energy and the Bose condensate function over a broad range densities and temperatures. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. PENN STATE UNIV,DEPT PHYS,UNIVERSITY PARK,PA 16802. NR 85 TC 8 Z9 8 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD DEC PY 1995 VL 101 IS 5-6 BP 881 EP 928 DI 10.1007/BF00754515 PG 48 WC Physics, Applied; Physics, Condensed Matter SC Physics GA TK906 UT WOS:A1995TK90600001 ER PT J AU Hong, M Schmidt-Rohr, K AF Hong, M Schmidt-Rohr, K TI DISTINCT NMR for sign determination of C-H dipolar couplings in liquid-crystalline lipids SO JOURNAL OF MAGNETIC RESONANCE SERIES B LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; C-13 NMR; ORIENTATION; BILAYERS; MEMBRANES; SOLIDS AB A recently introduced DISTINCT technique for the determination of the signs of C-H dipolar couplings is described in detail. It is a switching-angle spinning experiment that employs scalar couplings to make sign-dependent heteronuclear coherence observable, The pulse sequence and the time evolution of the density operator are described, both for proton-detected local field evolution and the carbon-detected separated focal field evolution, The original 1D DISTINCT experiment has also been developed into a 2D technique to allow the direct observation of antiphase dipolar powder spectra, characteristic of the signs of the dipolar couplings, These techniques are demonstrated on a liquid-crystalline lipid, lecithin. (C) 1995 Academic Press, Inc. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RP Hong, M (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 20 TC 6 Z9 6 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1064-1866 J9 J MAGN RESON SER B JI J. Magn. Reson. Ser. B PD DEC PY 1995 VL 109 IS 3 BP 284 EP 290 DI 10.1006/jmrb.1995.9993 PG 7 WC Physics, Atomic, Molecular & Chemical SC Physics GA TN774 UT WOS:A1995TN77400007 ER PT J AU Butler, WH Zhang, XG Nicholson, DMC MacLaren, JM AF Butler, WH Zhang, XG Nicholson, DMC MacLaren, JM TI Spin-dependent scattering and giant magnetoresistance SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT International Workshop on Spin Polarized Electron Transport CY FEB 19-22, 1995 CL MIAMI, FL ID COHERENT-POTENTIAL-APPROXIMATION; IRON-CHROMIUM ALLOYS; ELECTRICAL-RESISTIVITY; NI-ALLOYS; ENHANCED MAGNETORESISTANCE; 1ST-PRINCIPLES CALCULATION; FERROMAGNETISM; TRANSITION AB We consider the origins of the spin-dependent scattering which is believed to he responsible for the giant magnetoresistance effect. We argue on the basis of first-principles calculations of the electronic structure, magnetic moments, and electrical resistivities that this spin-dependent scattering originates largely from the tendency of spin-dependent atomic potentials to 'match' in one of the spin channels of magnetic alloys or multilayers. We also argue that the matched channel will tend to have a lower density of stares at the Fermi energy. Both of these effects will contribute to the GMR. We argue that there is the potential for a very large GMR in an ideal system, but that spin-independent scattering possibly coming from misaligned spins near the interfaces prevents its observation. C1 TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. RP Butler, WH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 35 TC 42 Z9 42 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD DEC PY 1995 VL 151 IS 3 BP 354 EP 362 DI 10.1016/0304-8853(95)00507-2 PG 9 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA TN461 UT WOS:A1995TN46100006 ER PT J AU Smith, CJ Chang, SY Yeung, ES AF Smith, CJ Chang, SY Yeung, ES TI Characterization of neutral red as a visible-wavelength MALDI matrix SO JOURNAL OF MASS SPECTROMETRY LA English DT Letter ID IONIZATION MASS-SPECTROMETRY; ASSISTED LASER DESORPTION; LARGE BIOMOLECULES; LARGE MOLECULES; 000 DALTON; PROTEINS C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 27 TC 20 Z9 20 U1 1 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1076-5174 J9 J MASS SPECTROM JI J. Mass Spectrom. PD DEC PY 1995 VL 30 IS 12 BP 1765 EP 1767 DI 10.1002/jms.1190301218 PG 3 WC Biophysics; Chemistry, Organic; Spectroscopy SC Biophysics; Chemistry; Spectroscopy GA TK616 UT WOS:A1995TK61600017 ER PT J AU Rawers, J Slavens, G AF Rawers, J Slavens, G TI Strengthening characteristics of nitrogen-alloyed 201 stainless steel SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE mechanical properties; nitrogen steels; type 201 stainless steel ID CR-NI ALLOYS; BEHAVIOR AB Strengthening characteristics of 201 stainless steel under nitrogen enhancement from zero to approximately 1.5 wt% N concentration are improved with increasing nitrogen. Yield and tensile strength, strain hardening, and cold-work/hardness relationships are proportional to nitrogen concentration. Strengths increased with increasing nitrogen up 1.0 wt %, even though at nitrogen concentrations greater than 0.65 wt%, Cr2N precipitates formed. Strengthening models from tensile and cold working are discussed, compared, and correlated to nitrogen concentration, tensile properties, and microstructure. RP Rawers, J (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 35 TC 7 Z9 8 U1 0 U2 1 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 DEC PY 1995 VL 4 IS 6 BP 697 EP 708 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA TL960 UT WOS:A1995TL96000007 ER PT J AU Lambrakos, SG Milewski, J AF Lambrakos, SG Milewski, J TI Analysis and refinement of a method for numerically modeling deep-penetration welding processes using geometric constraints SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE deep-penetration; geometric constraints; numerical modeling AB A detailed analysis and refinement of a method of numerically modeling deep-penetration welding processes using geometric constraints based on boundary information obtained experimentally is presented. The general features of the numerical method have been described previously. This paper considers issues concerning accurate numerical calculation of temperature and velocity fields in regions of the melt pool where the flow of fluid is characterized by quasi-stationary Stokes flow. It is this region of the melt pool that is closest to the heat-affected zone and that represents a significant fraction of the fusion zone. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM. RP Lambrakos, SG (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 10 TC 5 Z9 5 U1 0 U2 0 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 DEC PY 1995 VL 4 IS 6 BP 717 EP 729 DI 10.1007/BF02646448 PG 13 WC Materials Science, Multidisciplinary SC Materials Science GA TL960 UT WOS:A1995TL96000009 ER PT J AU LEE, WY BAE, YW MORE, KL AF LEE, WY BAE, YW MORE, KL TI SYNTHESIS OF FUNCTIONALLY GRADED METAL-CERAMIC MICROSTRUCTURES BY CHEMICAL-VAPOR-DEPOSITION SO JOURNAL OF MATERIALS RESEARCH LA English DT Note AB A composite microstructure consisting of small alpha-Al2O3 particles dispersed in a beta-NIAl coating matrix was synthesized by chemical vapor deposition (CVD). While the surface of a pure Ni substrate was being reacted with AlCl3 and H-2 to form beta-NiAl at a temperature of 1050 degrees C, the partial pressure of CO2 in the reactor was controlled via pulsing to nucleate and disperse 50 to 500 nm alpha-Al2O3 particles in the beta-NiAl matrix. The relative amount of the alpha-Al2O3 phase increased with coating thickness as the rate of the beta-NiAl formation decreased with time. These experimental observations suggest that the synthesis of a graded composite microstructure by the CVD method is feasible. RP LEE, WY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI More, Karren/A-8097-2016 OI More, Karren/0000-0001-5223-9097 NR 11 TC 9 Z9 9 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 DEC PY 1995 VL 10 IS 12 BP 3000 EP 3002 DI 10.1557/JMR.1995.3000 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA TJ639 UT WOS:A1995TJ63900005 ER PT J AU Hwang, SL Lin, HT Becher, PF AF Hwang, SL Lin, HT Becher, PF TI Mechanical properties of beta-Si3N4 whisker reinforced alpha'-SiAlON ceramics SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SIALON CERAMICS; FRACTURE-TOUGHNESS; COMPOSITES; CREEP; SI3N4; PHASE AB The effects of beta-Si3N4 whisker additions on the mechanical properties of alpha'-SiAION ceramics were studied. The room temperature fracture toughness and fracture strength of the composites increased with increasing whisker content, and were 6.5 MPa m(1/2) and 900 MPa, respectively, for the addition of 30 vol% whiskers. Although creep resistance of the composites was not enhanced at 1200 degrees C, the whisker additions were observed to be beneficial in reducing the oxidation induced slow crack growth of alpha'-SiAION that occurred at 1300 degrees C, and thereby, improved the creep resistance of the composites at 1300 degrees C. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. NR 21 TC 14 Z9 14 U1 0 U2 1 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 DEC 1 PY 1995 VL 30 IS 23 BP 6023 EP 6027 DI 10.1007/BF01151523 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA TK895 UT WOS:A1995TK89500027 ER PT J AU Hsueh, CH AF Hsueh, CH TI Matrix cracking with bonded interfaces in unidirectional fibre-reinforced composites SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID FIBER; CERAMICS; GLASS RP Hsueh, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 18 TC 0 Z9 0 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD DEC 1 PY 1995 VL 14 IS 23 BP 1698 EP 1701 DI 10.1007/BF00422679 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA TK897 UT WOS:A1995TK89700022 ER PT J AU MAHAN, GD AF MAHAN, GD TI DIFFUSION THROUGH A SLAB SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID LIGHT; MEDIA; SCATTERING; TRANSPORT; TISSUE AB Boltzmann's equation is solved for the diffusion of nonabsorbing particles through a thick slab. The dimensionless thickness D = d mu(s), where d is the thickness and mu(s) is the rate of scattering. Our solution neglects terms of order O(e(-D)) and is exact in the limit that D much greater than 1. Simple expressions are obtained for the reflection and transmission coefficients, as well as for the angular distributions on the front and back sides of the slab. (C) 1995 American Institute of Physics. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MAHAN, GD (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 31 TC 4 Z9 4 U1 0 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 DEC PY 1995 VL 36 IS 12 BP 6758 EP 6773 DI 10.1063/1.531186 PG 16 WC Physics, Mathematical SC Physics GA TH605 UT WOS:A1995TH60500017 ER PT J AU Browning, ND Pennycook, SJ AF Browning, ND Pennycook, SJ TI Atomic-resolution electron energy-loss spectroscopy in the scanning transmission electron microscope SO JOURNAL OF MICROSCOPY LA English DT Article; Proceedings Paper CT Archi Howie 60th Birthday Symposia, held at the Condensed Matter and Materials Physics Conference (CMMP 94) CY DEC, 1994 CL UNIV WARWICK, COVENTRY, ENGLAND SP Univ Cambridge HO UNIV WARWICK DE STEM; EELS; interfaces ID SCATTERED ELECTRONS; CRYSTALS; DIFFRACTION; STEM; MICROANALYSIS; IONIZATION; VISIBILITY; CONTRAST AB Recent developments in the dedicated scanning transmission electron microscope (STEM) now permit probe sizes of atomic dimensions to be obtained (0.22 nm FWHM at 100 kV). When coupled with an efficient parallel detector for electron energy-loss spectroscopy (EELS), there now exists the potential to obtain EELS with atomic resolution, This potential is further enhanced by the Z-contrast imaging technique in the STEM, which can produce incoherent, atomic-resolution images of crystalline structures, The Z-contrast image, being formed from only the high-angle thermal diffuse scattering, can thus be acquired simultaneously with the energy-loss spectrum and used to position the probe with atomic precision. However, to obtain an atomic-resolution energy-loss spectrum the range of the inelastic scattering must be less than the atomic spacing. Additionally, to enable a direct correlation between the spectrum and the Z-contrast image, i.e. a description of the spatial resolution of the spectrum in terms of a convolution of a probe intensity profile and an object function, we need to determine the conditions for incoherent imaging with inelastically scattered electrons. In this paper, a theorem for the spatial resolution of the inelastic signal first proposed by Ritchie and Howie and a hydrogenic model for the object function developed by Maslen and Rossouw are combined to calculate the object functions for several characteristic K-edges. More generally, the collection conditions, energy range and detectability for atomic-resolution spectra are discussed, Finally, atomic-resolution spectroscopy is demonstrated with a cobalt L-edge profile of an atomically abrupt CoSi2/Si (111) interface. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP Browning, ND (reprint author), UNIV ILLINOIS, DEPT PHYS, M-C 273, 845 W TAYLOR ST, CHICAGO, IL 60607 USA. OI Browning, Nigel/0000-0003-0491-251X NR 41 TC 19 Z9 19 U1 1 U2 10 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.. PD DEC PY 1995 VL 180 BP 230 EP 237 PN 3 PG 8 WC Microscopy SC Microscopy GA TN680 UT WOS:A1995TN68000006 ER PT J AU Hoffman, SMG FernandezSalguero, P Gonzalez, FJ Mohrenweiser, HW AF Hoffman, SMG FernandezSalguero, P Gonzalez, FJ Mohrenweiser, HW TI Organization and evolution of the cytochrome P450 CYP2A-2B-2F subfamily gene cluster on human chromosome 19 SO JOURNAL OF MOLECULAR EVOLUTION LA English DT Article DE cytochrome P450; CYP2A; CYP2B; CYP2F; gene family; tandem duplication ID FLUORESCENCE INSITU HYBRIDIZATION; CDNA-DIRECTED EXPRESSION; INVERTED DUPLICATION; HIGH-RESOLUTION; HUMAN-LIVER; IDENTIFICATION; SUPERFAMILY; SEQUENCES; COUMARIN; FAMILY AB Cytochrome P450 genes from the CYP2A, CYP2B, and CYP2F subfamilies form a tight cluster which we have localized on the detailed physical map of human chromosome 19. The corresponding three gene subfamilies are also clustered in the mouse genome, on the region of chromosome 7 known to be syntenic to human chromosome 19. One hundred eight cosmid clones from the human P450 region were assembled into a single contig of 350 kb, restriction mapped, and probed with cDNAs from the three gene subfamilies. A total of 11 genes were identified in humans, including five from the 2A subfamily, three from the 2B subfamily, and three from the 2F subfamily; at least six of the 11 are pseudogenes. The organization of the genes, with members of the three subfamilies intermixed, indicates that the evolution of this gene cluster has been complex. The modern gene arrangement in humans is probably the result of a series of tandem duplications, plus at least one inverted duplication. The identification of all genes and pseudogenes in this cluster also makes it possible to determine the origins of some previously known variant P450 transcripts. C1 LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOL RES PROGRAM,LIVERMORE,CA 94551. NCI,BETHESDA,MD 20892. OI Fernandez-Salguero, Pedro M./0000-0003-2839-5027 NR 34 TC 68 Z9 72 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0022-2844 J9 J MOL EVOL JI J. Mol. Evol. PD DEC PY 1995 VL 41 IS 6 BP 894 EP 900 PG 7 WC Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity GA TM930 UT WOS:A1995TM93000026 PM 8587134 ER PT J AU SERIMAA, R SERIMAA, O BIENENSTOCK, A AF SERIMAA, R SERIMAA, O BIENENSTOCK, A TI AN IMPROVED REGULARIZATION TECHNIQUE FOR THE ANALYSIS OF ANOMALOUS SCATTERING DATA SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 6th International Conference on the Structure of Non-Crystalline Materials (NCM 6) CY AUG 29-SEP 02, 1994 CL PRAGUE, CZECH REPUBLIC SP Acad Sci Czech Republic, Inst Phys, Commiss European Communities, Directoriat Gen Sci Res & Dev, Czech Commiss UNESCO, Int Union Pure & Appl Phys, Int Sci Fdn, Washington, Staropramen Brewery, Prague, Icaris Ltd Conf Management Prague ID X-RAY-SCATTERING; ALLOYS AB The Tikhonov regularization method is applied in a new iterative way to extract partial structure factors (PSFs) from anomalous X-ray scattering data. Monte Carlo simulations are performed to produce sets of intensity curves from an amorphous molybdenum-germanium alloy (14 at.% Mo), from which the PSFs are then obtained. The role of computer simulations in the error estimation and in choosing the optimum measuring strategy to yield sufficiently precise results is discussed. C1 CTR COMP SCI,SF-02101 ESPOO,FINLAND. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP SERIMAA, R (reprint author), UNIV HELSINKI,DEPT PHYS,POB 9,SF-00014 HELSINKI,FINLAND. 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 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1995 VL 193 BP 372 EP 375 DI 10.1016/0022-3093(95)00446-7 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA TJ247 UT WOS:A1995TJ24700079 ER PT J AU MAGRUDER, RH WEEKS, RA MORGAN, SH PAN, Z HENDERSON, DO ZUHR, RA AF MAGRUDER, RH WEEKS, RA MORGAN, SH PAN, Z HENDERSON, DO ZUHR, RA TI LINEAR AND NONLINEAR-OPTICAL PROPERTIES OF LEAD NANOMETER DIMENSION METAL PARTICLES IN SILICA FORMED BY ION-IMPLANTATION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 6th International Conference on the Structure of Non-Crystalline Materials (NCM 6) CY AUG 29-SEP 02, 1994 CL PRAGUE, CZECH REPUBLIC SP Acad Sci Czech Republic, Inst Phys, Commiss European Communities, Directoriat Gen Sci Res & Dev, Czech Commiss UNESCO, Int Union Pure & Appl Phys, Int Sci Fdn, Washington, Staropramen Brewery, Prague, Icaris Ltd Conf Management Prague AB Nanometer dimension metal colloid-glass composites were fabricated by ion implantation of Pb in silica. The samples were implanted with nominal doses of 3, 6 and 12 x 10(16) ions/cm(2). The optical absorption was measured from 200 to 900 Mn and found to increase with increasing dose. The non-linear index of refraction was measured using the z-scan technique. The non-linear response, 1.0 X 10(-10) less than or equal to n(2) less than or equal to 6.8 X 10(-10) cm(2)/W increased with increasing dose. Both the linear and non-linear response are due to the presence of the nanometer dimension Pb metal particles. C1 VANDERBILT UNIV,DEPT APPL & ENGN SCI,NASHVILLE,TN 37235. FISK UNIV,DEPT PHYS,NASHVILLE,TN 37208. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. NR 14 TC 10 Z9 10 U1 0 U2 0 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 DEC PY 1995 VL 193 BP 546 EP 549 DI 10.1016/0022-3093(95)00404-1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA TJ247 UT WOS:A1995TJ24700116 ER PT J AU REGAN, MJ BIENENSTOCK, A AF REGAN, MJ BIENENSTOCK, A TI CHARACTERIZATION OF PHASE-SEPARATION IN AMORPHOUS FILMS USING MODERN SMALL-ANGLE SCATTERING METHODS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 6th International Conference on the Structure of Non-Crystalline Materials (NCM 6) CY AUG 29-SEP 02, 1994 CL PRAGUE, CZECH REPUBLIC SP Acad Sci Czech Republic, Inst Phys, Commiss European Communities, Directoriat Gen Sci Res & Dev, Czech Commiss UNESCO, Int Union Pure & Appl Phys, Int Sci Fdn, Washington, Staropramen Brewery, Prague, Icaris Ltd Conf Management Prague ID X-RAY-SCATTERING; ALLOYS; SEGREGATION AB Small-angle X-ray scattering has been used as a structural tool to characterize phase separation in vapor-deposited amorphous thin films. When combined with the anomalous dispersion effect, it becomes possible to differentiate voids from chemical inhomogeneity. These methods, as well as oblique transmission measurements, have been used to observe and characterize phase separation in sputtered amorphous MocGe1-c and FecGe1-c alloys. The chemical inhomogeneities depend on the deposition conditions, are quite anisotropic and extremely small (10-30 Angstrom), exist throughout a wide composition range (c < 0.33 for Fe-Ge and c < 0.25 for Mo-Ge), and are distinctly different in the Mo and Fe containing films. It is shown how it is possible to determine the endpoints of the phase separation, with results indicating endpoint compositions of amorphous Ge and an intermetallic phase of stoichiometry close to amorphous FeGe2 or MoGe3. Finally, with the use of cylindrical correlation functions, it is demonstrated that small-angle X-ray scattering can be interpreted in terms of an anisotropic microstructure and present straightforward growth models for phase separation in evolving, amorphous films. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. NR 25 TC 6 Z9 6 U1 0 U2 1 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 DEC PY 1995 VL 193 BP 644 EP 652 DI 10.1016/0022-3093(95)00421-1 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA TJ247 UT WOS:A1995TJ24700138 ER PT J AU PARK, SY WEEKS, RA ZUHR, RA AF PARK, SY WEEKS, RA ZUHR, RA TI BIMODAL OR MULTIMODAL DISTRIBUTION OF ION-IMPLANTED BISMUTH IN FUSED-SILICA SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID RADIATION-INDUCED DIFFUSION; OPTICAL WAVE-GUIDES; INSULATORS; GLASSES; SIO2 AB Near-surface regions of high-purity optical-grade fused silica discs (Corning 7940) were modified by implantation with bismuth ions at 160 and 320 keV to nominal doses ranging from 1 to 9 X 10(16) Bi/cm(2). Substrate temperatures during implantation were -197, 25 and 600 degrees C with a dose rate of similar to 3 mu A/cm(2). Samples implanted with a nominal dose of 6 X 10(16) Bi/cm(2) were subsequently annealed at temperatures ranging from 500 to 1000 degrees C in oxidizing and inert atmospheres. The distribution of bismuth ions in fused silica was investigated by Rutherford backscattering spectrometry (RBS). The distribution of the implanted species was strongly dependent on the annealing atmosphere, substrate temperature and implantation energy. In general, there was a driving force toward the surface at lower annealing temperatures (between 500 and 700 degrees C) and away from the surface at higher temperatures (T > 700 degrees C) in an oxygen atmosphere. However, there was a driving force only toward the surface in an argon atmosphere. At an annealing temperature of 600 degrees C for 60 min in an oxygen atmosphere, a bi- or multi-modal distribution of bismuth ions in the samples implanted at 160 keV was observed. C1 OAK RIDGE NATL LAB,DIV SOLID STATE PHYS,SURFACE MODIFICAT & CHARACTERIZAT FACIL,OAK RIDGE,TN 37831. RP PARK, SY (reprint author), VANDERBILT UNIV,BOX 544,GPC,NASHVILLE,TN 37203, USA. NR 36 TC 8 Z9 8 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1995 VL 191 IS 3 BP 281 EP 292 DI 10.1016/0022-3093(95)00314-2 PG 12 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA TG457 UT WOS:A1995TG45700003 ER PT J AU Klueh, RL Alexander, DJ Kenik, EA AF Klueh, RL Alexander, DJ Kenik, EA TI Development of low-chromium, chromium-tungsten steels for fusion SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID CR-W STEELS; MICROSTRUCTURE; BEHAVIOR AB High-chromium (9-12% Cr) Cr-Mo and Cr-W ferritic steels are favored as candidates for fusion applications. In early work to develop reduced-activation steels, an Fe-2.25Cr-2W-0.25V-0.1C steel (designated 2.25Cr-2WV) had better strength than an Fe-9Cr-2W-0.25V-0.07Ta-0.1C (9Cr-2WVTa) steel (compositions are in weight percent). However, the 2.25Cr-2WV had poor impact properties, as determined by the ductile-brittle transition temperature and upper-shelf energy of subsize Charpy impact specimens. Because low-chromium steels have some advantages over high-chromium steels, a program to develop low-chromium steels is in progress. Microstructural analysis indicated that the reason for the inferior impact toughness of the 2.25Cr-2WV was the granular bainite obtained when the steel was normalized. Properties can be improved by developing an acicular bainite microstructure by increasing the cooling rate after austenitization. Alternatively, acicular bainite can be promoted by increasing the hardenability. Hardenability was changed by adding small amounts of boron and additional chromium to the 2.25Cr-2WV composition. A combination of B, Cr, and Ta additions resulted in low-chromium reduced-activation steels with mechanical properties comparable to those of 9Cr-2WVTa. RP Klueh, RL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 25 TC 33 Z9 34 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1995 VL 227 IS 1-2 BP 11 EP 23 DI 10.1016/0022-3115(95)00143-3 PG 13 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA TL561 UT WOS:A1995TL56100002 ER PT J AU Lewis, BJ Andre, B Morel, B Dehaudt, P Maro, D Purdy, PL Cox, DS Iglesias, FC Osborne, MF Lorenz, RA AF Lewis, BJ Andre, B Morel, B Dehaudt, P Maro, D Purdy, PL Cox, DS Iglesias, FC Osborne, MF Lorenz, RA TI Modelling the release behaviour of cesium during severe fuel degradation SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID FISSION-PRODUCT RELEASE; SEVERE ACCIDENT CONDITIONS; URANIUM-DIOXIDE; GAS-RELEASE; UO2; DIFFUSION; OXIDATION; ELEMENTS AB An analytical model has been developed to describe the diffusional release of fission product cesium from Zircaloy-clad fuel under high temperature reactor accident conditions. The model is based on the analysis of recent annealing experiments performed at the Chalk River Laboratories in steam. The present treatment accounts for the influence of the atmosphere (i.e., changing oxygen potential) on the state of fuel oxidation and the release kinetics. The effects of fuel dissolution on the volatile release behaviour (under reducing conditions) is considered in terms of earlier crucible experiments and a simple model based on bubble coalescence and transport in metal pools. This model has also been used to interpret the cesium release kinetics observed in steam and hydrogen experiments at the Vertical Irradiation (VI) Facility in the Oak Ridge National Laboratory and at the HEVA/VERCORS Facility in the Commissariat a l'Energie Atomique. C1 CEA,CEN FONTENAY AUX ROSES,INST PROTECT SURETE NUCL,DEPT PROTECT ENVIRONNEM INSTALLAT,F-92265 FONTENAY ROSES,FRANCE. ROYAL MIL COLL CANADA,DEPT CHEM & CHEM ENGN,KINGSTON,ON K7K 5L0,CANADA. ATOM ENERGY CANADA LTD,RES CO,CHALK RIVER LABS,CHALK RIVER,ON K0J 1J0,CANADA. ONTARIO HYDRO,DEPT REACTOR SAFETY & OPERAT ANAL,TORONTO,ON M5G 1X6,CANADA. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RP Lewis, BJ (reprint author), CEA,CEN GRENOBLE,DEPT THERMOHYDRAUL & PHYS,SERV ETUD COMPORTEMENT COMBUSTIBLE,17 RUE MARTYRS,F-38054 GRENOBLE 9,FRANCE. NR 57 TC 30 Z9 30 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1995 VL 227 IS 1-2 BP 83 EP 109 DI 10.1016/0022-3115(95)00130-1 PG 27 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA TL561 UT WOS:A1995TL56100010 ER PT J AU VOLKOW, ND DING, YS FOWLER, JS WANG, GJ LOGAN, J GATLEY, SJ SCHLYER, DJ PAPPAS, N AF VOLKOW, ND DING, YS FOWLER, JS WANG, GJ LOGAN, J GATLEY, SJ SCHLYER, DJ PAPPAS, N TI A NEW PET LIGAND FOR THE DOPAMINE TRANSPORTER - STUDIES IN THE HUMAN BRAIN SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE CARBON-11-D-THREO-METHYLPHENIDATE; DOPAMINE TRANSPORTER; COCAINE; DOPAMINE NEURONS ID POSITRON EMISSION TOMOGRAPHY; COCAINE BINDING-SITES; PARKINSONS-DISEASE; RECEPTOR-BINDING; INVIVO; BABOON; DRUGS; SYSTEM; ANALOG AB Carbon-11-d-threo-methylphenidate, the active enantiomer of methylphenidate (ritalin), has been shown to bind uniquely to the dopamine transporter in the baboon brain. This study characterizes its binding in the human brain and measures its test-retest reproducibility. Methods: Studies were done in seven normal controls, each of whom was scanned with [C-11]d-threo-methylphenidate on two different occasions. Six subjects were scanned twice 3-5 wk apart without intervention to assess reproducibility. One subject was scanned sequentially before and after treatment with methylphenidate to assess binding saturability. Graphical analysis was used to obtain tissue distribution volumes (DV). The ratio of the DV in the basal ganglia (BG) to that in cerebellum (CB) (DVBG/DVCB), which corresponds to (B-max/Kd) + 1 was used to estimate dopamine transporter availability. Results: Highest tracer uptake occurred in the basal ganglia, where activity peaked 7-11 min postinjection. The half-clearance time for the tracer in brain regions other than the basal ganglia was 74 min. In the basal ganglia, only 10%-15% of the activity had cleared at 74 min. Time-activity curves for [C-11]d-threo-methylphenidate in the basal ganglia and cerebellum were highly reproducible. The average percent change for the absolute value for DVBG/DVCB was 6.5% +/- 4% (range 0-12%). Methylphenidate pretreatment decreased basal ganglia uptake but not cortical or cerebellar binding and reduced DVBG/DVCB by 62% and B-max/Kd by 91 %. Conclusion: These studies demonstrate that [C-11]d-threo-methylphenidate binding in the human brain is reversible, highly reproducible and saturable. Thus, it is an appropriate PET ligand to measure dopamine transporter availability. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP VOLKOW, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NIDA NIH HHS [5RO1-DA06891]; NINDS NIH HHS [NS15638] NR 55 TC 75 Z9 77 U1 2 U2 3 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 22090-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD DEC PY 1995 VL 36 IS 12 BP 2162 EP 2168 PG 7 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA TK409 UT WOS:A1995TK40900008 PM 8523098 ER PT J AU DING, YS FOWLER, JS VOLKOW, ND LOGAN, J GATLEY, SJ SUGANO, Y AF DING, YS FOWLER, JS VOLKOW, ND LOGAN, J GATLEY, SJ SUGANO, Y TI CARBON-11-D-THREO-METHYLPHENIDATE BINDING TO DOPAMINE TRANSPORTER IN BABOON BRAIN SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE CARBON-11-D-THREO METHYLPHENIDATE; DOPAMINE TRANSPORTER; STEREOSELECTIVITY; DOPAMINERGIC NEURON ID POSITRON EMISSION TOMOGRAPHY; DL-THREO-METHYLPHENIDATE; MONOAMINE REUPTAKE SITES; PARKINSONS-DISEASE; PHARMACOLOGICAL CHARACTERIZATION; SEROTONIN TRANSPORTERS; COCAINE RECEPTORS; UPTAKE INHIBITOR; PRIMATE BRAIN; INVIVO AB The more active d-enantiomer of methylphenidate (dl-threo-methyl-2-phenyl-2-(2-piperidyl)acetate, Ritalin) was labeled with C-11(t(1/2): 20.4 min) to characterize its binding, examine its specificity for the dopamine transporter and evaluate it as a radiotracer for the presynaptic dopaminergic neuron. Methods: PET studies were carried out in the baboon. The pharmacokinetics of [(11) C]d-threo-methylphenidate ([C-11]d-threo-MP) were measured and compared with [C-11]l-threo-MP and with its racemate [(11) C]dl-threo-methylphenidate, [C-11]MP). Nonradioactive methylphenidate was used to assess the reversibility and saturability of the binding. GBR 12909, 3 beta-(4-iodophenyl)tropane-2-carboxylic acid methyl ester (beta-CIT), tomoxetine and citalopram were used to assess the binding specificity. Results: The ratio between radioactivity in the striatum and that in the cerebellum (ST/CB) after injection of [C-11]d-threo-MP was higher than that for [C-11]MP and [C-11](-threo-MP (3.3 for d-, 2.2 for racemic and 1.1 for l- in the same baboon). Most of the striatal binding of [C-11]d-threo-MP was displaceable by injection of nonradioactive MP. Pretreatment with nonradjoactive MP (0.5 mg/kg), GBR12909 (1.5 mg/kg) and RTI-55 (0.3 mg/kg) markedly reduced striatal but not cerebellar uptake of [C-11]d-threo-MP. In all cases, the ST/CB after pretreatment was reduced by about 60% compared to 43% for [C-11]MP. The ratios of distribution volumes at steady-state for the ST/CB for the three separate studies in the same baboon were reduced by about 50%, as compared with 37% for [C-11]MP. In contrast, pretreatment with tomoxetine (3.0 mg/kg) or citalopram (2.0 mg/kg) did not change [C-11]d-threo-MP kinetics; the ST/CB after pretreatment was similar to that for the control. Conclusion: These results demonstrate the saturable, reversible and specific binding of [C-11]d-threo-MP to the dopamine transporter in the baboon brain, suggesting that [C-11]d-threo-MP will be a useful PET tracer for the presynaptic dopaminergic neuron in living human brain. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP DING, YS (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,BLDG 555,UPTON,NY 11973, USA. FU NIDA NIH HHS [DA-06278]; NINDS NIH HHS [NS-15380, NS-15638] NR 45 TC 61 Z9 61 U1 2 U2 2 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 22090-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD DEC PY 1995 VL 36 IS 12 BP 2298 EP 2305 PG 8 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA TK409 UT WOS:A1995TK40900033 PM 8523123 ER PT J AU ZHU, ZL ESPENSON, JH AF ZHU, ZL ESPENSON, JH TI OXIDATION OF ALKYNES BY HYDROGEN-PEROXIDE CATALYZED BY METHYLRHENIUM TRIOXIDE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID MAIN-GROUP ELEMENTS; TRANSITION-METALS; MULTIPLE BONDS; METHYLTRIOXORHENIUM; HYDROCARBONS; PERMANGANATE; ACETYLENES; MECHANISM; MO(VI) AB The oxidation of alkynes with hydrogen peroxide is catalyzed by methylrhenium trioxide. The reactions can be rationalized by postulating that an oxirene intermediate is formed between a rhenium peroxide and the alkyne. Internal alkynes yield alpha-diketones and carboxylic acids, the latter from the complete cleavage of the triple bonds. Rearrangement products were observed only for aliphatic alkynes. Terminal alkynes gave carboxylic acids and their derivatives and alpha-keto acids as the major products, but their yields varied with the solvent used. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 45 TC 101 Z9 103 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD DEC 1 PY 1995 VL 60 IS 24 BP 7728 EP 7732 DI 10.1021/jo00129a010 PG 5 WC Chemistry, Organic SC Chemistry GA TH610 UT WOS:A1995TH61000010 ER PT J AU Dai, S Sumpter, BG Noid, DW AF Dai, S Sumpter, BG Noid, DW TI Modeling of binary molten-salt phase diagrams via neural networks SO JOURNAL OF PHASE EQUILIBRIA LA English DT Article ID CONJUGATE AB Computational neural networks are used as implicit thermodynamic models for calculating phase diagrams of binary molten salts. The neural network model accurately describes conformal ionic solution theory in binary systems thereby providing an efficient scheme for determining phase diagrams. Preliminary results are presented for model AC(2)-BC2 systems. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Sumpter, Bobby/C-9459-2013; Dai, Sheng/K-8411-2015 OI Sumpter, Bobby/0000-0001-6341-0355; Dai, Sheng/0000-0002-8046-3931 NR 17 TC 0 Z9 0 U1 0 U2 2 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1054-9714 J9 J PHASE EQUILIB JI J. Phase Equilib. PD DEC PY 1995 VL 16 IS 6 BP 493 EP 500 DI 10.1007/BF02646717 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA TZ898 UT WOS:A1995TZ89800004 ER PT J AU ZeislerMashl, KL Lograsso, TA AF ZeislerMashl, KL Lograsso, TA TI Determination of the In-rich peritectic region in the In-Sn system by differential scanning calorimetry SO JOURNAL OF PHASE EQUILIBRIA LA English DT Article AB Phase compositions at the In-rich peritectic isotherm in the In-Sn phase diagram and related liquidus and solidus slopes were determined through differential scanning calorimetry, The resultant liquid composition at the peritectic temperature was essentially the same as reported in previous work [64Heu, 83Eva], but the compositions of primary (In) and peritectic beta were significantly higher in the solute element Sn than previously reported. These higher levels of Sn are most likely due to reduced microsegregation resulting from the very slow heating and cooling rates utilized in this work. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 5 TC 3 Z9 3 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1054-9714 J9 J PHASE EQUILIB JI J. Phase Equilib. PD DEC PY 1995 VL 16 IS 6 BP 516 EP 519 DI 10.1007/BF02646721 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA TZ898 UT WOS:A1995TZ89800008 ER PT J AU Rappe, MS Kemp, PF Giovannoni, SJ AF Rappe, MS Kemp, PF Giovannoni, SJ TI Chromophyte plastid 16s ribosomal RNA genes found in a clone library from Atlantic Ocean seawater SO JOURNAL OF PHYCOLOGY LA English DT Article DE chloroplasts; molecular evolution; ribosomal RNA ID ALGA OLISTHODISCUS-LUTEUS; GREEN CHLOROPLASTS; DNA; PROBES; IDENTIFICATION; DIVERSITY; ORIGIN; CELLS AB In recent gears, the cloning of ribosomal RNA genes from natural plankton communities has provided insight into the biodiversity of marine bacterioplankton. Small eukaIyotic phytoplankton, like bacterioplankton, can be difficult to cultivate or identify routinely by morphological characteristics. We used bacteria-specific 16S rRNA primers to amplify genes from picoplankton samples collected on 0.2-mu m filters by filtration from a depth of 10 m in the pelagic region over the continental shelf off Cape Hatteras, North Carolina. Nucleic acid sequencing and probe hybridization revealed that chromophyte plastid genes comprised 25% of the genes in a library of 170 clones. The plastid genes belonged to two groups within the Chromophyta: the Prymnesiophyceae and the Bacillariophyceae. Comparisons revealed substantial diversity among the bacillariophyte gene sequences, but the species from which the genes originated could not be identified because few sequences from cultured bacillariophytes are available. The prymnesiophyte genes could not be identified either, although they were most similar (similarity = 0.94) to plastid genes from the coccolithophorid Emiliania huxleyi (Lohmann) Hay and Mohler strain PML92D. These results provide evidence of abundant chromophyte plastid 16S rRNA genes in the water over the continental shelf off Cape Hatteras. The results also suggest that plastid 16S rRNA genes may provide suitable genetic markers for studying phytoplankton biodiversity and biogeography. C1 OREGON STATE UNIV, DEPT MICROBIOL, CORVALLIS, OR 97331 USA. BROOKHAVEN NATL LAB, DIV OCEANOG & ATMOSPHER SCI, UPTON, NY 11973 USA. RI Kemp, Paul/G-2291-2011 OI Kemp, Paul/0000-0001-8947-4349 NR 35 TC 18 Z9 18 U1 0 U2 1 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0022-3646 J9 J PHYCOL JI J. Phycol. PD DEC PY 1995 VL 31 IS 6 BP 979 EP 988 DI 10.1111/j.0022-3646.1995.00979.x PG 10 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA TQ782 UT WOS:A1995TQ78200018 ER PT J AU Dunahay, TG Jarvis, EE Roessler, PG AF Dunahay, TG Jarvis, EE Roessler, PG TI Genetic transformation of the diatoms Cyclotella cryptica and Navicula saprophila SO JOURNAL OF PHYCOLOGY LA English DT Article DE acetyl-CoA carboxylase; Bacillariophyceae; Cyclotella cryptica; G418; microprojectile bombardment; Navicula saprophila; neomycin phosphotransferase; transformation ID CHLAMYDOMONAS-REINHARDTII; NUCLEAR TRANSFORMATION; SELECTABLE MARKER; MEDIATED TRANSFORMATION; STABLE TRANSFORMATION; FIREFLY LUCIFERASE; EXPRESSION; DNA; PROTOPLASTS; CARBOXYLASE AB Two species of diatoms were genetically transformed by introducing plasmid vectors containing the Escherichia coli neomycin phosphotransferase II (nptII) gene. Expression of the bacterial nptII gene in the diatoms was achieved using the putative promoter and terminator sequences from the acetyl-CoA carboxylase gene from the centric diatom Cyclotella cryptica T13L Reimann, Lewin, and Guillard. The vectors were introduced into C. cryptica and the pennate diatom Navicula saprophila NAVIC1 Lange-Bertalot and Bonik by microprojectile bombardment. Putative transformants were selected based on their ability to grow in the presence of the antibiotic G418, and production of the neomycin phosphotransferase protein by the transformed cells was confirmed by western blotting. The foreign DIVA integrated into one or more random sites within the genome of the transformed algal cells, often in the form of tandem repeats. This is the first report of reproducible, stable genetic transformation of a chlorophyll c-containing alga. RP Dunahay, TG (reprint author), NATL RENEWABLE ENERGY LAB,APPL BIOL SCI BRANCH,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 38 TC 147 Z9 170 U1 9 U2 64 PU PHYCOLOGICAL SOC AMER INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044 SN 0022-3646 J9 J PHYCOL JI J. Phycol. PD DEC PY 1995 VL 31 IS 6 BP 1004 EP 1012 DI 10.1111/j.0022-3646.1995.01004.x PG 9 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA TQ782 UT WOS:A1995TQ78200021 ER PT J AU Abrikosov, AA AF Abrikosov, AA TI On the nature of the order parameter in HTSC and influence of impurities SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; VANHOVE SINGULARITIES; FERMI-SURFACE; BI2SR2CACU2O8+DELTA AB A model of superconductivity in layered high-temperature superconducting cuprates is proposed, based on the extended saddle point singularities in the electron spectrum, weak screening of the Coulomb interaction and phonon-mediated interaction between electrons plus a small short-range repulsion of Hund's or spin-fluctuation origin. This permits to explain the large values of T-c, features of the isotope effect, photoemission results for the gap and the seemingly conflicting results of Josephson experiments in various geometries. The influence of impurity scattering on T-c, the order parameter at T = 0 and the density of states, including the energy gap, are studied for the same model. It is shown that the suppression of the gap in the vicinities of the singularities is weak, and the same is true for T-c. Since the order parameter beyond the singularity is still defined by its value in the singular region, it scales with this value and varies only slightly. However. the energy gap in this region, which does not coincide with the order parameter, varies rapidly with impurity concentration, and the gap becomes isotropic in the strong scattering limit. These conclusions agree with preliminary experimental observations. RP Abrikosov, AA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 24 TC 2 Z9 2 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 DEC PY 1995 VL 56 IS 12 BP 1567 EP 1572 DI 10.1016/0022-3697(95)00090-9 PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700002 ER PT J AU Kresin, VZ Wolf, SA Adrian, SD Reeves, ME Ovchinnikov, YN AF Kresin, VZ Wolf, SA Adrian, SD Reeves, ME Ovchinnikov, YN TI Energy spectrum of high-T-c oxides: Two-gap structure, gaplessness, and implications SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID PRESSURE-DEPENDENCE; TEMPERATURE; STATE AB The energy spectrum of the cuprates depends on the level of doping. Deviation from stoichometry may introduce magnetic impurities, which, in turn, lead to a gapless scenario with peculiar optical, transport, magnetic and thermodynamic properties. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. GEORGE WASHINGTON UNIV, WASHINGTON, DC 20052 USA. LD LANDAU THEORET PHYS INST, MOSCOW, RUSSIA. RP Kresin, VZ (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RI Wolf, Stuart/A-7513-2009 NR 29 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1995 VL 56 IS 12 BP 1623 EP 1626 DI 10.1016/0022-3697(95)00138-7 PG 4 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700011 ER PT J AU Brandow, BH AF Brandow, BH TI A valence-fluctuation mechanism with highly anisotropic s-wave pairing SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB DE valence-fluctuation mechanism; anisotropic-s gap; T-c systematics; exotic superconductors ID COPPER-OXIDE SUPERCONDUCTORS; BAND-STRUCTURE; TEMPERATURE; LIFETIME; FIELD AB We report on a fairly ab initio theory of cuprate superconductivity, based on the concept that the above-T-c state is a normal Fermi liquid with strong correlations of the type found in valence-fluctuation and heavy-fermion materials. These correlations (within an assumed normal ground stats) are found to provide a satisfactory source or mechanism in the pairing. Many electronic features of the cuprates are quantitatively reproduced by this theory, and for some there is even semi-quantitative agreement. This report focuses especially on the gap form, on major aspects of the cuprate T-c systematics and on evidence suggesting that this mechanism is also operating (together with phonons) in a number of other superconductors. RP Brandow, BH (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 21 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 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1995 VL 56 IS 12 BP 1699 EP 1700 DI 10.1016/0022-3697(95)00093-3 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700028 ER PT J AU Parks, B Orenstein, J Mallozzi, R Nemeth, DT Ludwig, F Clarke, J Merchant, P Lew, DJ Bozovoc, I Eckstein, JN AF Parks, B Orenstein, J Mallozzi, R Nemeth, DT Ludwig, F Clarke, J Merchant, P Lew, DJ Bozovoc, I Eckstein, JN TI Re-examining the vortex state of cuprate superconductors with gap anisotropy SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID YBA2CU3O7 THIN-FILMS; TEMPERATURE-DEPENDENCE; II SUPERCONDUCTORS; CONDUCTIVITY; NODES AB We consider the effect of gap nodes on the electrodynamic response of superconductors in the vortex state. We show that for a gap with line nodes it is not possible to ignore the effect of field-induced pairbreaking on the electrodynamic response. We describe measurements of both the diagonal and the Hall components of the resistivity which support this conclusion. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. HEWLETT PACKARD LABS,PALO ALTO,CA 94304. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. VARIAN ASSOCIATES INC,EDWARD L GINZTON RES CTR,PALO ALTO,CA 94304. RP Parks, B (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720, USA. RI Orenstein, Joseph/I-3451-2015 NR 28 TC 3 Z9 3 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 DEC PY 1995 VL 56 IS 12 BP 1815 EP 1819 DI 10.1016/0022-3697(95)00237-5 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700073 ER PT J AU Paget, KM Lemberger, TR Foltyn, SR Wu, XD AF Paget, KM Lemberger, TR Foltyn, SR Wu, XD TI Comparison of chain (Co) and plane (Zn) dopants on charge transport in YBa2CuO7-delta SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB AB We report the penetration depth, A, and infrared reflectance of a YBa2(Cu0.97Co0.03)(3)O-7-delta film from 35 cm(-1) to 600 cm(-1) and from 10 K to 300 K. Co is a chain dopant in contrast to previous work on Zn which is a plane dopant. The effects of the chain dopants and the plane dopants are similar in the normal state. For example, the reflectance of the 3% Co sample is very similar to 4% Zn sample at 100 K and 300 K. However, in the superconducting state, 3% Co has a high reflectance similar to pure YBa2Cu3O7-delta while 4% Zn has a gapless reflectance. The penetration depth of the Co doped sample is close to that of pure YBa2Cu3O7-delta while that of the Zn doped film is a factor of five larger. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Paget, KM (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1995 VL 56 IS 12 BP 1837 EP 1838 DI 10.1016/0022-3697(95)00238-3 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700080 ER PT J AU Stadlober, B Krug, G Nemetschek, R Opel, M Hackl, R Einzel, D Schuster, C Devereaux, TP Forro, L Cobb, JL Markert, JT Neumeier, JJ AF Stadlober, B Krug, G Nemetschek, R Opel, M Hackl, R Einzel, D Schuster, C Devereaux, TP Forro, L Cobb, JL Markert, JT Neumeier, JJ TI Study of k-dependent electronic properties in cuprate superconductors using Raman spectroscopy SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. ECOLE POLYTECH FED LAUSANNE,DEPT PHYS,CH-1015 LAUSANNE,SWITZERLAND. UNIV TEXAS,AUSTIN,TX 78712. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Stadlober, B (reprint author), WALTHER MEISSNER INST TIEFTEMP FORSCH,D-85748 GARCHING,GERMANY. RI Opel, Matthias/L-8784-2016 OI Opel, Matthias/0000-0003-4735-9574 NR 4 TC 3 Z9 3 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 DEC PY 1995 VL 56 IS 12 BP 1841 EP 1842 DI 10.1016/0022-3697(95)00187-5 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700082 ER PT J AU Campuzano, JC Ding, H Bellman, A Norman, MR Randeria, M Jennings, G Yokoya, T Takahashi, T KatayamaYoshida, H Mochiku, T Kadowaki, K AF Campuzano, JC Ding, H Bellman, A Norman, MR Randeria, M Jennings, G Yokoya, T Takahashi, T KatayamaYoshida, H Mochiku, T Kadowaki, K TI ARPES studies in the normal and superconducting state of Bi2Sr2CaCu2O8 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. TOHOKU UNIV,SENDAI,MIYAGI 980,JAPAN. NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN. RP Campuzano, JC (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607, USA. RI Takahashi, Takashi/E-5080-2010; Campuzano, Juan Carlos/G-4358-2012; Norman, Michael/C-3644-2013; YOKOYA, Takayoshi/B-1478-2011; OI Ding, Hong/0000-0003-4422-9248 NR 4 TC 0 Z9 0 U1 0 U2 3 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 DEC PY 1995 VL 56 IS 12 BP 1863 EP 1864 DI 10.1016/0022-3697(95)00224-3 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700087 ER PT J AU Olson, CG Tobin, JG Waddill, GD Lynch, DW Liu, JZ AF Olson, CG Tobin, JG Waddill, GD Lynch, DW Liu, JZ TI The 1 eV peak: A consistent feature of the cuprate superconductors SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB AB We report data supporting the view that the sometimes controversial 1 eV peak in the angle-resolved photoemission spectrum of YBa2Cu3O6.9 is, in fact, representative of cuprate superconductors. Detailed spectra for YBa2Cu3O6.9 show that the peak is composed of a family of initial states of both even and odd symmetry. C1 IOWA STATE UNIV,DEPT PHYS & ASTRON,AMES,IA 50011. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV MISSOURI,ROLLA,MO 65401. UNIV CALIF DAVIS,DAVIS,CA 95616. RP Olson, CG (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. RI Tobin, James/O-6953-2015 NR 8 TC 6 Z9 6 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 DEC PY 1995 VL 56 IS 12 BP 1879 EP 1880 DI 10.1016/0022-3697(95)00142-5 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700092 ER PT J AU Poirier, DM Olson, CG Lynch, DW Schmidt, M Cho, BK Canfield, PC AF Poirier, DM Olson, CG Lynch, DW Schmidt, M Cho, BK Canfield, PC TI Observation of band dispersion in YNi2B2C SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB DE YNi2B2C; superconductor; angle resolved photoemission AB We report the first angle resolved photoemission spectroscopy (ARPES) study of single crystals of a borocarbide superconductor. In the normal state, there is clear evidence of dispersion within the manifold of Ni 3d features between similar to 1 and 3 eV binding energy. Dispersive features were also observed within similar to 1 eV of the Fermi level (E(F)) near the Gamma and Z points of the bulk Brillouin zone. Resonant photoemission indicates partial Ni character for these states. An E(F) crossing occurs at a k-space position that is consistent with a predicted hole pocket centered on the G(1) point of the reciprocal lattice. In the photon energy range used (17-200 eV), symmetry points in multiple Brillouin zones were consistently located assuming a free electron final state. C1 IOWA STATE UNIV,DEPT PHYS & ASTRON,AMES,IA 50011. RP Poirier, DM (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. RI Canfield, Paul/H-2698-2014 NR 8 TC 9 Z9 9 U1 0 U2 3 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 DEC PY 1995 VL 56 IS 12 BP 1881 EP 1882 DI 10.1016/0022-3697(95)00108-5 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700093 ER PT J AU Boekema, C SuarezBarnes, IM Gubanov, VA Cooke, DW Leon, M AF Boekema, C SuarezBarnes, IM Gubanov, VA Cooke, DW Leon, M TI Anomalies in vortex states of cuprate superconductors SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB DE ceramics; superconductors; magnetic structure; muon-spin resonance; superconductivity AB A maximum-entropy (ME) technique has been applied to transverse-field (TF) muon-spin relaxation (mu SR) data of several cuprate superconductors [1, 2]. For the RBa(2)Cu(3)O(7) (R1237) vortex states, we have seen low-field tails and cliffs in the ME field distribution estimates for TF mu SR data recorded near 5 K at 1 kOe. The sharp fall-off is only present when R is a magnetic ion (like Er or Gd), or occurs for Pr-doping in Y1237. The ME vortex field distributions of Bi2Sr2CaCu2Ox (Bi2212) and Tl2Ba2Ca2Cu3Ox (Tl2223) show no low field tails well below T-c, which is consistent with vortex pancake formation. ME transforms for Pb0.9In0.1 (a typical type-II superconductor) show the expected vortex field distributions. All the (magnetic) non-BCS like anomalies seen for the cuprate vortex states suggest that perhaps the cuprate superconductors are not (typical) type-II superconductors. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Boekema, C (reprint author), SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1995 VL 56 IS 12 BP 1905 EP 1906 DI 10.1016/0022-3697(95)00092-5 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700100 ER PT J AU Aeppli, G Mason, TE Mook, HA Hayden, SM AF Aeppli, G Mason, TE Mook, HA Hayden, SM TI Magnetic fluctuations in lamellar copper oxides SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID SUPERCONDUCTING LA1.86SR0.14CUO4; EXCITATIONS; DYNAMICS; LA2CUO4 C1 UNIV TORONTO,TORONTO,ON,CANADA. OAK RIDGE NATL LAB,OAK RIDGE,TN. UNIV BRISTOL,BRISTOL,AVON,ENGLAND. RP Aeppli, G (reprint author), AT&T BELL LABS,ENGN RES CTR,POB 900,PRINCETON,NJ 08540, USA. RI Hayden, Stephen/F-4162-2011; Mason, Thomas/M-5809-2014 OI Hayden, Stephen/0000-0002-3209-027X; Mason, Thomas/0000-0003-1880-3971 NR 7 TC 2 Z9 2 U1 0 U2 3 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 DEC PY 1995 VL 56 IS 12 BP 1911 EP 1911 DI 10.1016/0022-3697(95)00131-X PG 1 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700103 ER PT J AU Birgeneau, RJ Aharony, A Belk, NR Chou, FC Endoh, Y Greven, M Hosoya, S Kastner, MA Lee, CH Lee, YS Shirane, G Wakimoto, S Wells, BO Yamada, K AF Birgeneau, RJ Aharony, A Belk, NR Chou, FC Endoh, Y Greven, M Hosoya, S Kastner, MA Lee, CH Lee, YS Shirane, G Wakimoto, S Wells, BO Yamada, K TI Magnetism and magnetic fluctuations in La2-xSrxCuO4 for x=0 (2D antiferromagnet), 0.04 (3D spin glass) and x=0.15 (superconductor) SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID REMANENT MAGNETIZATION; LOW-TEMPERATURES; LA2CUO4; EXCITATIONS; DYNAMICS; LENGTH; PHASE AB We review recent studies of the static and dynamic magnetic fluctuations in La2-xSrxCuO4. In La2CuO4(T-N = 325K) the instantaneous two-dimensional (2D) spin correlations have been studied over the temperature range 340K < T greater than or equal to 820K. We find quantitative agreement for the correlation length over the complete temperature range with no adjustable parameters with predictions for the 2D quantum non-linear sigma model in the renormalized classical regime. We have carried out bulk magnetization measurements in La1.96Sr0.04CuO4 which has neither antiferromagnetic long range order nor superconductivity. All of the features that characterize a canonical spin glass transition have been seen: irreversibility remnant magnetization and scaling behavior. Finally, neutron inelastic scattering experiments have been performed on homogeneous single crystals of La1.85Sr0.15CuO4 with T-c=37.3K (at onset), higher than any previously studied single crystals. The temperature dependence of the low energy incommensurate peak intensity at (pi(1+/-delta), pi) and (pi, pi(1+/-delta)) exhibits a pronounced maximum near T-c. In contrast to the results reported on lower T-c crystals, the intensity for energies below 3.5 meV dramatically decreases as the temperature decreases below T-c, vanishing into the background below similar to 15K. The behavior is consistent with predictions based on a d(x)2(-gamma)2 superconducting order parameter. C1 MIT,CTR MAT SCI & ENGN,CAMBRIDGE,MA 02139. TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 98077,JAPAN. YAMANASHI UNIV,FAC ENGN,INST INORGAN SYNTH,KOFU,YAMANASHI 400,JAPAN. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP Birgeneau, RJ (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Yamada, Kazuyoshi/C-2728-2009 NR 27 TC 24 Z9 24 U1 0 U2 3 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 DEC PY 1995 VL 56 IS 12 BP 1913 EP 1919 DI 10.1016/0022-3697(95)00234-0 PG 7 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700104 ER PT J AU Song, YQ Reyes, AP Tang, XP Halperin, WP Hinks, D AF Song, YQ Reyes, AP Tang, XP Halperin, WP Hinks, D TI Cu-63 NMR in heavily doped La2CuO4 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID SPIN-RELAXATION RATES; SUSCEPTIBILITY; DYNAMICS AB We report Cu-63 NMR and NQR studies on La2-xSrxCuO4 and our results of Cu-63 Knight shift show a progressive variation of the temperature dependence as a function of x, for 0.10 < x < 0.3125. These results appear to be consistent with the theoretical calculations of ''t - J'' model. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,SCI & TECHNOL CTR SUPERCONDUCTIV,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NR 17 TC 1 Z9 1 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1995 VL 56 IS 12 BP 1939 EP 1940 DI 10.1016/0022-3697(95)00167-0 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700109 ER PT J AU Maple, MB Dalichaouch, Y DeAndrade, MC Dilley, NR Herrmann, J Movshovich, R AF Maple, MB Dalichaouch, Y DeAndrade, MC Dilley, NR Herrmann, J Movshovich, R TI Recent issues in the physics of heavy fermion materials SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 15-18, 1995 CL STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA SP Stanford Univ, Stanford Synchrotron Radiat Lab, Argonne Natl Lab, Los Alamos Natl Lab HO STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB ID ELECTRON SUPERCONDUCTOR URU2SI2; MAGNETIC ORDER; UPT3; CERU2; FLUCTUATIONS; INSTABILITY; ANISOTROPY; PRESSURE; SURFACE; UPD2AL3 AB The basic properties of heavy fermion materials are briefly summarized. Several recent issues in the physics of heavy fermion materials are discussed, including the unconventional superconductivity of UPt3, non Fermi liquid behavior in strongly correlated f-electron systems and the possible observation of the Fulde-Ferrel-Larkin-Ovchinnikov spatially nonuniform superconducting state. C1 UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Maple, MB (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 48 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 DEC PY 1995 VL 56 IS 12 BP 1963 EP 1968 DI 10.1016/0022-3697(95)00271-5 PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA TL547 UT WOS:A1995TL54700115 ER PT J AU NATH, SK MCCOY, JD CURRO, JG SAUNDERS, RS AF NATH, SK MCCOY, JD CURRO, JG SAUNDERS, RS TI DENSITY-FUNCTIONAL THEORY OF POLYMER-POLYMER PHASE-SEPARATION BEHAVIOR SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLYMER BLENDS; FLORY-HUGGINS THEORY; DENSITY FUNCTIONAL THEORY; PRISM THEORY ID INTEGRAL-EQUATION THEORY; EQUILIBRIUM STATISTICAL MECHANICS; NONUNIFORM POLYATOMIC SYSTEMS; ANGLE NEUTRON-SCATTERING; SITE MODEL-THEORY; QUANTUM-SYSTEMS; NEMATIC PHASES; GENERAL-THEORY; THERMODYNAMICS; MIXTURES AB Polyatomic density functional theory is applied to a binary polymer blend. The polymer reference interaction site model (PRISM) liquid state theory provides the homogeneous state correlation functions necessary for the application of density functional theory. An effective chi parameter can be recognized from the density functional expression; however, the phase separation criteria does not depend solely upon the chi parameter, rather it depends upon various combinations of the species-dependent direct correlation functions of the blend. The Flory-Huggins chi parameter along with the associated phase diagram is obtained when the monomer volumes of the blend species are equal and for a range of monomer-monomer attractive interactions. Calculations are performed both with and without the assumption of incompressibility. The density functional theory along with the PRISM determined ''input'' predict that an isotopic polymer blend shows an upper critical solution temperature (UCST) phenomena. (C) 1995 John Wiley & Sons, Inc. C1 NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RI McCoy, John/B-3846-2010 OI McCoy, John/0000-0001-5404-1404 NR 49 TC 12 Z9 12 U1 0 U2 7 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD DEC PY 1995 VL 33 IS 17 BP 2307 EP 2317 DI 10.1002/polb.1995.090331702 PG 11 WC Polymer Science SC Polymer Science GA TG026 UT WOS:A1995TG02600002 ER PT J AU CHENG, YY CEBE, P CAPEL, M SCHREUDERGIBSON, H BLUHM, A YEOMANS, W AF CHENG, YY CEBE, P CAPEL, M SCHREUDERGIBSON, H BLUHM, A YEOMANS, W TI SMALL-ANGLE X-RAY-SCATTERING STUDY OF LIQUID-CRYSTALLINE POLYCARBONATES BASED ON ALPHA-METHYL STILBENE MESOGEN AND METHYLENE-CONTAINING FLEXIBLE SPACER SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE SMALL-ANGLE X-RAY SCATTERING; MONOTROPIC LIQUID CRYSTALLINE POLYMER; STILBENE MESOGEN; METHYLENE SPACER; ODD-EVEN EFFECT ID ETHER KETONE) CRYSTALLIZATION; CONFORMATIONAL ISOMERISM; MAIN-CHAIN; THERMOTROPIC POLYETHERS; PHASE-TRANSITIONS; MELTING BEHAVIOR; THERMAL HISTORY; ODD NUMBER; 1-(4-HYDROXYPHENYL)-2-(2-METHYL-4-HYDROXYPHENYL)ETHANE; POLYMERS AB Crystallization and melting behavior are studied by small-angle X-ray scattering (SAXS) for a series of recently synthesized monotropic liquid crystalline polycarbonates based on alpha-methyl stilbene mesogen and methylene flexible spacer. The one-dimensional electron density correlation function is used to obtain long period, crystal thickness, and linear crystallinity from the Lorentz-corrected SAXS intensity. Changes in these parameters during nonisothermal crystallization and melting are explained by a model of dual crystal populations. The primary crystals form first using the liquid crystalline phase as crystal nuclei, while smaller and less perfect crystals form later from the isotropic phase at low temperature. The results of the real-time SAXS study of isothermal crystallization also support the view that: the nematic phase serves as crystal nuclei for fast crystallization. An odd-even effect in crystal thickness and linear crystallinity is observed in all the SAXS experiments mentioned above. The results of this study and our complementary wide-angle X-ray scattering (WAXS) investigation show clearly that the difference in the position of the neighboring carbonate dipoles on a chain affects structural organization both at the unit cell level and at the level of the crystal in these monotropic LCPs. (C) 1995 John Wiley & Sons, Inc. C1 MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. USA,NATICK RES DEV & ENGN CTR,NATICK,MA 01760. NR 45 TC 15 Z9 15 U1 2 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD DEC PY 1995 VL 33 IS 17 BP 2331 EP 2341 DI 10.1002/polb.1995.090331704 PG 11 WC Polymer Science SC Polymer Science GA TG026 UT WOS:A1995TG02600004 ER PT J AU ZHANG, G LEBEDEV, BV WUNDERLICH, B ZHANG, JY AF ZHANG, G LEBEDEV, BV WUNDERLICH, B ZHANG, JY TI HEAT-CAPACITIES OF POLY(AMINO ACID)S AND PROTEINS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE HEAT CAPACITY; PROTEIN; POLY(AMINO ACID); INSULIN; POLY(L-METHIONINE); POLY(L-PHENYLALANINE); VIBRATIONAL FREQUENCY SPECTRUM ID CARBON BACKBONE POLYMERS; LINEAR MACROMOLECULES; THERMODYNAMIC PROPERTIES; SKELETAL VIBRATIONS; ADDITION SCHEME; SOLID-STATE; CHAINS AB In an ongoing effort to understand the thermodynamic properties of proteins, solid-state heat capacities of poly(amino acid)s of all 20 naturally occurring amino acids and 4 copoly(amino acid)s have been previously reported on and were analyzed using our Advanced THermal Analysis System (ATHAS). We extend the heat capacities of poly(l-methionine) (PLMET) and poly(L-phenylalanine) (PLPHEA) with new low temperature measurements from 10 to 340 K. In addition, analyses were performed on literature data of a first protein, zinc bovine insulin dimer C508H752O150N130S12Zn, using both the ATHAS empirical addition scheme and computation with an approximate vibrational spectrum for the protein. For the solid state, agreement with the measurement could be accomplished to +/-1.6% for PLMET, +/-3.5% for PLPHEA, and +/-3.2% for insulin, linking the macroscopic heat capacity to its microscopic cause, the group and skeletal vibrational motion. For each polymer, one set of parameters, Theta(1) and Theta(3), of the Tarasov function representing the skeletal vibrational contribution to the heat capacity are obtained from a new optimization procedure [PLMET: 542 K and 83 K (number of skeletal vibrations N-s = 15); PLPHEA: 396 K and 67 K (N-s = 11); and insulin monomer: 599 K and 79 K (N-s = 628), respectively]. Enthalpy, entropy,and Gibbs free energy have been derived for the solid state. (C) 1995 John Wiley & Sons, Inc. C1 OAK RIDGE NATL LAB,DIV ANALYT & CHEM SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. NI LOBACHEVSKII STATE UNIV,INST CHEM,NIZHNII NOVGOROD,RUSSIA. NR 26 TC 10 Z9 10 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD DEC PY 1995 VL 33 IS 17 BP 2449 EP 2455 DI 10.1002/polb.1995.090331716 PG 7 WC Polymer Science SC Polymer Science GA TG026 UT WOS:A1995TG02600016 ER PT J AU Peachey, NM Dye, RC Ries, PD Warren, M Olken, M AF Peachey, N. M. Dye, R. C. Ries, P. D. Warren, M. Olken, M. TI Pulsed Laser Deposition of Zeolitic Thin Films: Novel Structures for Molecular Recognition SO JOURNAL OF POROUS MATERIALS LA English DT Article DE zeolitic films; pulsed laser deposition; molecular recognition; sensors; membranes AB Pulsed Laser Deposition is used to deposit zeolitic films onto a substrate. Using this technique, thin films are formed using both mordenite and faujasite targets. The target application for the films was the development of gas-selective sensors. These films are comprised of small crystallites embedded in an amorphous matrix. The amorphous material is microporous having pore sizes on the order of those in the parent zeolites. These pores are oriented perpendicular to the substrate. Pore orientation coupled with the high porosity provides a thin film with a potential for high gas throughputs. Quartz crystal microbalances coated with the material have been tested for gas uptake and have shown to discriminate between isomers of small molecules. Beyond sensors, the zeolitic films may hold promise for such applications as membranes. C1 [Peachey, N. M.; Dye, R. C.] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Ries, P. D.; Warren, M.; Olken, M.] Dow Chem Co, Midland, MI 48674 USA. RP Peachey, NM (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 19 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 1380-2224 J9 J POROUS MAT JI J. Porous Mat. PD DEC PY 1995 VL 2 IS 4 BP 331 EP 339 DI 10.1007/BF00489815 PG 9 WC Chemistry, Applied; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA V20GO UT WOS:000208128700009 ER PT J AU LI, WM TONG, TW DOBRANICH, D GRITZO, LA AF LI, WM TONG, TW DOBRANICH, D GRITZO, LA TI COMBINED NARROW-BAND AND WIDE-BAND MODEL FOR COMPUTING THE SPECTRAL ABSORPTION-COEFFICIENT OF CO2, CO, H2O, CH4, C2H2, AND NO SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID ACETYLENE AB This paper presents a new computational procedure for computing the spectral absorption coefficient of CO2, CO, H2O, CH4, C2H2, and NO. The procedure is based on a combined narrow- and wide-band model which gives the absorption coefficient as a function of radiation wavelength, temperature, total pressure and partial pressure of the gases. The average line spacing is the only correlation parameter that is adjusted to fit integrated band absorptance data. Results show that the accuracy of the present procedure is comparable to those obtained from using existing correlations. A positive feature of the present procedure is, however, a single model that is applicable to all the gases considered. C1 ARIZONA STATE UNIV,DEPT MECH & AEROSP ENGN,TEMPE,AZ 85287. SANDIA NATL LABS,DEPT THERMAL & FLUID ENGN,ALBUQUERQUE,NM 87185. NR 21 TC 11 Z9 13 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD DEC PY 1995 VL 54 IS 6 BP 961 EP 970 DI 10.1016/0022-4073(95)00126-6 PG 10 WC Optics; Spectroscopy SC Optics; Spectroscopy GA TH123 UT WOS:A1995TH12300006 ER PT J AU Bardeau, JF Bulou, A Swanson, BI AF Bardeau, JF Bulou, A Swanson, BI TI Influence of Pt-Cl force constants on the Raman lineshapes in (PtCl)-Cl-35/Cl-37 chains SO JOURNAL OF RAMAN SPECTROSCOPY LA English DT Article ID VALENCE; COMPLEXES; PLATINUM; SPECTRA AB The influence of the Cl-35/Cl-37 isotopic disorder of natural chlorine on the Raman and infrared lineshapes of the vibrational modes in PtCl chains was calculated as a function of the interionic force constants in a one-dimensional model. It is shown that the fine structure of the Raman line is strongly dependent of the Pt-3+delta-Cl and Pt-3-delta-Cl force constants, and so it can be used to estimate the charge disproportion delta. From the case of [Pt(en)(2)][Pt(en)(2)Cl-2](ClO4)(4) it appears that the description of the high-wavenumber infrared line (v(2)) requires one to take into account interactions with more distant ions. It is also shown that the intensity of the low-wavenumber infrared-active mode (v(3)) is so weak that the corresponding line may have never been observed. C1 LOS ALAMOS NATL LAB,MSC345,INC4,LOS ALAMOS,NM 87545. RP Bardeau, JF (reprint author), UNIV MAINE,FAC SCI,PHYS ETAT CONDENSE LAB,CNRS,URA 807,F-72017 LE MANS,FRANCE. NR 17 TC 6 Z9 6 U1 1 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0377-0486 J9 J RAMAN SPECTROSC JI J. Raman Spectrosc. PD DEC PY 1995 VL 26 IS 12 BP 1051 EP 1057 DI 10.1002/jrs.1250261206 PG 7 WC Spectroscopy SC Spectroscopy GA TL096 UT WOS:A1995TL09600005 ER PT J AU Kunz, M Dinnebier, R Cheng, LK McCarron, EM Cox, DE Parise, JB Gehrke, M Calabrese, J Stephens, PW Vogt, T Papoular, R AF Kunz, M Dinnebier, R Cheng, LK McCarron, EM Cox, DE Parise, JB Gehrke, M Calabrese, J Stephens, PW Vogt, T Papoular, R TI Cs(TiAs)O-5 and Cs(TiP)O-5: A disordered parent structure of ABOCO(4) compounds SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID OPTICAL CRYSTAL CSTIOASO4; KTIOPO4 AB The structures of the two isostructural compounds Cs (TiAs)O-5 (CTA) and Cs(TiP)O-5 (CTP) were solved and refined by application of the Rietveld profile technique to high-resolution synchrotron X-ray and neutron powder data. The structures are cubic, space group with a 10.23415(5) Angstrom (CTA) and alpha = 10.08733(2) Angstrom (CTP), and are characterized by an unusual framework consisting of randomly disordered TiO6 octahedra and XO(4) (X As, P) tetrahedra with the Cs+ cation occupying large cavities within this framework. The lack of long-range order between octahedra and tetrahedra simulates partially occupied octahedra shared by Ti and X with large displacement parameters for both cations and oxygens. The Ti,X-site can be resolved as a split-atom position where the tetrahedral metal is shifted from the center toward the edge formed by the octahedral oxygens. Split-oxygen positions were refined from a combination of X-ray and neutron data for CTA. The cubic structure is related to the orthorhombic KTiOPO4-type structure in that the latter can be derived from the former by ordering of the TiO6 octahedra and PO4 tetrahedra. Since different ordering schemes applied to the cubic CTA/CTP structure lead to other known ordered structures of the same stoichiometry such as K(Mg1/13Nb2/3)OPO4 and gamma-NaTiOPO4, cubic CTA/CTP can be viewed as the ''mother of all ABOCO(4)- structures.'' The elucidation of the cubic structure allows us to propose a quantified ''threatened structure model,'' which helps in the understanding of the mechanism of this phase transition. (C) 1995 Academic Press, Inc. C1 SUNY STONY BROOK,CHIPR,NEW YORK,NY. SUNY STONY BROOK,DEPT EARTH & SPACE SCI,NEW YORK,NY. SUNY STONY BROOK,DEPT PHYS,NEW YORK,NY. DUPONT CO INC,EXPTL STN,WILMINGTON,DE. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RI Vogt, Thomas /A-1562-2011; Kunz, Martin/K-4491-2012; Dinnebier, Robert/B-5642-2015 OI Vogt, Thomas /0000-0002-4731-2787; Kunz, Martin/0000-0001-9769-9900; Dinnebier, Robert/0000-0003-2778-2113 NR 28 TC 19 Z9 22 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 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD DEC PY 1995 VL 120 IS 2 BP 299 EP 310 DI 10.1006/jssc.1995.1412 PG 12 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA TN207 UT WOS:A1995TN20700013 ER PT J AU Palmer, DA NguyenTrung, C AF Palmer, DA NguyenTrung, C TI Aqueous uranyl complexes .3. Potentiometric measurements of the hydrolysis of uranyl(VI) ion at 25 degrees C SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE hydrolysis; uranyl; potentiometric; thermodynamics; aqueous ID URANIUM; ELECTROLYTES; DIOXOURANIUM(VI); THERMODYNAMICS; EQUILIBRIA; PH AB Potentiometric titrations of uranyl(VI) solutions were conducted using a standard glass/calomel electrode combination over the pH range 3 to 12 at 0.1 mol-kg(-1) ionic strength with tetramethylammonium trifluoromethanesulfonate as the supporting electrolyte. The electrodes were calibrated directly on the hydrogen ion concentration scale during the initial stage of each titration. The species, UO22+, (UO2)(2)(OH)(2)(2+), (UO2)(3)(OH)(5)(+), (UO2)(3)OH)(7)(-), (UO2)(3)(OH)(8)(2-), and (UO2)(3)(OH)(10)(4-) identified in an earlier Raman study were compatible with the analysis of the titration data. Based on this analysis and application of the extended Debye-Huckel treatment, the polynuclear species indicated above were assigned overall formation constants at 25 degrees C and at infinite dilution of -5.51+/-0.04, -15.3+/-0.1, -27.77+/-0.09, -37.65+/-0.14, and -62.4+/-0.3, respectively. The results are discussed in reference to hydrolysis quotients reported in the literature for the first three species. Formation quotients for the last two species have not been reported previously. RP Palmer, DA (reprint author), OAK RIDGE NATL LAB,DIV CHEM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 31 TC 38 Z9 40 U1 2 U2 6 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 DEC PY 1995 VL 24 IS 12 BP 1281 EP 1291 DI 10.1007/BF00972833 PG 11 WC Chemistry, Physical SC Chemistry GA TY559 UT WOS:A1995TY55900005 ER PT J AU WOODWARD, WA WHITNEY, P ESLINGER, PW AF WOODWARD, WA WHITNEY, P ESLINGER, PW TI MINIMUM HELLINGER DISTANCE ESTIMATION OF MIXTURE PROPORTIONS SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Article DE MINIMUM DISTANCE ESTIMATION; ROBUSTNESS; SIMULATION; RELATIVE EFFICIENCY ID MAXIMUM-LIKELIHOOD; DISTRIBUTIONS AB Beran (1977) showed that, under certain restrictive conditions, the minimum distance estimator based on the Hellinger distance (MHDE) between a projection model density and a nonparametric sample density is an exception to the usual perception that a robust estimator cannot achieve full efficiency under the true model. We examine the MHDE in the case of estimation of the mixing proportion in the mixture of two normals. We discuss the practical feasibility of employing the MHDE in this setting and examine empirically its robustness properties. Our results indicate that the MHDE obtains full efficiency at the true model while performing comparably with the minimum distance estimator based on Cramer-von Mises distance under the symmetric departures from component normality considered. C1 SO METHODIST UNIV, DEPT STAT SCI, DALLAS, TX 75275 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 19 TC 21 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STAT PLAN INFER JI J. Stat. Plan. Infer. PD DEC PY 1995 VL 48 IS 3 BP 303 EP 319 DI 10.1016/0378-3758(95)00006-U PG 17 WC Statistics & Probability SC Mathematics GA TF971 UT WOS:A1995TF97100004 ER PT J AU LIPFERT, FW WYZGA, RE AF LIPFERT, FW WYZGA, RE TI AIR-POLLUTION AND MORTALITY - ISSUES AND UNCERTAINTIES SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID MEASUREMENT ERRORS; ASSOCIATIONS; DISEASE; COUNTY AB Results from 31 epidemiology studies linking air pollution with premature mortality are compared and synthesized. Consistent positive associations between mortality and various measures of air pollution have been shown within each of two fundamentally different types of regression studies and in many variations within these basic types; this is extremely unlikely to have occurred by chance. In this paper, the measure of risk used is the elasticity, which is a dimensionless regression coefficient defined as the percentage change in the dependent variable associated with a 1% change in an independent variable, evaluated at the means. This metric has the advantage of independence from measurement units and averaging times, and is thus suitable for comparisons within and between studies involving different pollutants. Two basic types of studies are considered: time-series studies involving daily perturbations, and cross-sectional studies involving longer-term spatial gradients. The latter include prospective studies of differences in individual survival rates in different locations and studies of the differences in annual mortality rates for various communities. For a given data set, time-series regression results will vary according to the seasonal adjustment method used, the covariates included, and the lag structure assumed. The results from both types of cross-sectional regressions are highly dependent on the methods used to control for socioeconomic and personal lifestyle factors and on data quality. A major issue for all of these studies is that of partitioning the response among collinear pollution and weather variables. Previous studies showed that the variable with the least exposure measurement error may be favored in multiple regressions; assigning precise numerical results to a single pollutant is not possible under these circumstances. We found that the mean overall elasticity as obtained from time-series studies for mortality with respect to various air pollutants entered jointly was about 0.048, with a range from 0.01 to 0.12. This implies that about 5% of daily mortality is associated with air pollution, on average. The corresponding values from population-based cross-sectional studies were similar in magnitude, but the results from the three recent prospective studies varied from zero to about five times as much. Long-term responses in excess of short-term responses might be interpreted as showing the existence of chronic effects, but the uncertainties inherent in both types of studies make such an interpretation problematic. C1 ELECT POWER RES INST,PALO ALTO,CA. RP LIPFERT, FW (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 53 TC 71 Z9 71 U1 0 U2 5 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA PO BOX 2861, PITTSBURGH, PA 15230 SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD DEC PY 1995 VL 45 IS 12 BP 949 EP 966 PG 18 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA TJ648 UT WOS:A1995TJ64800004 PM 8542379 ER PT J AU Hong, WS DeJonghe, LC Yang, X Rahaman, MN AF Hong, WS DeJonghe, LC Yang, X Rahaman, MN TI Reaction sintering of ZnO-Al2O3 SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID ZINC FERRITE; COMPOSITES; PARTICLES; POWDERS AB The reaction sintering of equimolar mixtures of ZnO and Al2O3 powders was investigated as a function of primary processing parameters such as the temperature, heating rate, green density, and particle size, The powder mixtures mere prepared by two different methods, In one method, the ZnO and Al2O3 powders were ball-milled. In the other method, the ZnO powder was chemically precipitated onto the Al2O3 particles dispersed in a solution of zinc chloride, The sintering characteristics of the compacted powders prepared by each method were compared with those for a pre-reacted, single-phase powder of zinc aluminate, ZnAl2O4. The chemical reaction between ZnO and Al2O3 occurred prior to densification of the powder compact and was accompanied by fairly large expansion, The mixing procedure had a significant effect on the densification rate during reaction sintering, The densification rate of the compact formed from the ball-milled powder was strongly inhibited compared to that for the single-phase ZnAl2O4 powder. However, the densification rate of the compact formed from the chemically precipitated mixture was almost identical to that for the ZnAl2O4 powder. The difference in sintering between the ball-milled mixture and the chemically precipitated mixture is interpreted in terms of differences in the microstructural uniformity of the initial powder compacts resulting from the different preparation procedures. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV MISSOURI,DEPT CERAM ENGN,ROLLA,MO 65401. RP Hong, WS (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720, USA. NR 24 TC 86 Z9 87 U1 0 U2 9 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 DEC PY 1995 VL 78 IS 12 BP 3217 EP 3224 DI 10.1111/j.1151-2916.1995.tb07957.x PG 8 WC Materials Science, Ceramics SC Materials Science GA TL329 UT WOS:A1995TL32900005 ER PT J AU Wang, WE Olander, DR AF Wang, WE Olander, DR TI Thermodynamics of the Zr-H system SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SOLID-SOLUTIONS; HYDROGEN; TITANIUM; OXYGEN; SOLUBILITY; ZIRCONIUM; DEUTERIUM; ZIRCALOY AB The consistencies among the reported univariant hydrogen pressures in the three two-phase regions of the Zr-H system, alpha Zr/delta ZrH2-x, alpha Zr/beta Zr, and beta Zr/delta ZrH2-x, are evaluated with the thermodynamic constraint derived by Speiser.(16) Hydrogen dissolution in alpha Zr is evaluated by checking the consistencies among the Sieverts' law constant, the terminal solubility, and the corresponding two-phase univariant pressures involving this phase, A modified Sieverts' law is proposed for the complicated behavior of hydrogen dissolution in beta Zr. An analytical composition-temperature-pressure relationship for delta ZrH2-x is established by using the quasi-chemical model derived by Arita et al. The thermodynamic constraint of the free energy of formation of ZrH2 shows that the value measured by Fredricken et al, is the most reliable, In addition, a more accurate free energy of formation of zirconium hydride at the upper phase boundary of alpha Zr/delta ZrH2-x two-phase region is suggested. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. RP Wang, WE (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT NUCL ENGN,BERKELEY,CA 94720, USA. NR 43 TC 32 Z9 32 U1 2 U2 19 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 DEC PY 1995 VL 78 IS 12 BP 3323 EP 3328 DI 10.1111/j.1151-2916.1995.tb07972.x PG 6 WC Materials Science, Ceramics SC Materials Science GA TL329 UT WOS:A1995TL32900020 ER PT J AU Gale, DC Smith, RD AF Gale, DC Smith, RD TI Characterization of noncovalent complexes formed between minor groove binding molecules and duplex DNA by electrospray ionization mass spectrometry SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID SEQUENCE-SPECIFIC RECOGNITION; DIEN-MICROGONOTROPEN-A; DISTAMYCIN-A; STRUCTURAL CHARACTERIZATION; OLIGONUCLEOTIDE DUPLEX; TRIPYRROLE PEPTIDES; DESIGN; NMR; CONFORMATION; INTERCALATION AB The noncovalent complex formed in solution between minor groove binding molecules and an oligonucleotide duplex was investigated by electrospray ionization-mass spectrometry (ESI-MS). The oligonucleotide duplex formed between two sequence-specific 14-base pair oligonucleotides was observed intact by ESI-MS and in relatively high abundance compared to the individual single-stranded components. Only sequence-specific A:B duplexes were observed, with no evidence of random nonspecific aggregation (i.e., A:A or B:B) occurring under the conditions utilized. Due to the different molecular weights of the two 14-base Fair oligonucleotides, unambiguous determination of each oligonucleotide and the sequence-specific duplex was confirmed through their detection at unique mass-to-charge ratios. The noncovalent complexes formed between the self-complementary 5'-dCGCAAA7TTTGCG-3' oligonucleotide and three minor groove binding molecules (distamycin A, pentamidine, and Hoechst 33258) were also observed. Variation of several electrospray ionization interface parameters as well as collision-induced dissociation methods were utilized to characterize the nature and stability of the noncovalent complexes. The noncovalent complexes upon collisional activation dissociated into single-stranded oligonucleotides and single-stranded oligonucleotides associated with a minor groove binding molecule. ESI-MS shows potential for the study of small molecule-oligonucleotide duplex interactions and determination of small molecule binding stoichiometry. 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 76 TC 93 Z9 95 U1 1 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD DEC PY 1995 VL 6 IS 12 BP 1154 EP 1164 DI 10.1016/1044-0305(95)00530-7 PG 11 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA TL530 UT WOS:A1995TL53000003 PM 24214066 ER PT J AU Choi, YK Chjo, KH Park, SM Doddapaneni, N AF Choi, YK Chjo, KH Park, SM Doddapaneni, N TI Oxygen reduction at Co(II)(2)-disalophen modified carbon electrodes SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTROCHEMICAL REDUCTION; METAL PHTHALOCYANINES; COBALT PHTHALOCYANINE; CATALYTIC REDUCTION; CATHODIC REDUCTION; HYDROGEN-PEROXIDE; AQUEOUS-SOLUTIONS; DIOXYGEN; ELECTROCATALYSIS; ELECTROREDUCTION AB Oxygen reduction at a dinuclear Co(II)-Schiff-base complex, Co(II),-3,3', 4,4'-tetra(salicylidene imino-1,1'-biphenyl tetrahydrate [Co(II),-disalophen; Co(II)(2)-DSP . 4H(2)O], modified carbon electrodes has been studied and results thereof are reported. The absorbed complex is shown to have a large catalytic effect for oxygen reduction. The oxygen reduction at the Co(II)(2)-DSP . 4H(2)O modified carbon electrodes is reasonably reversible in alkaline solutions with an apparent number of electrons transferred of around one and an estimated exchange rate constant of about 0.04 cm/s. The strong catalytic activity is explained by the formation of a reversible adduct with oxygen, i.e., Co(III)(2)-disalophen 2O(2)(-1), followed by reduction of Co(III) in the adduct. The cyclic voltammetric and chronoamperometric experimental results suggest that the first electron transfer should be a rate limiting step. C1 CHONNAM NATL UNIV, DEPT CHEM, KWANGJU, SOUTH KOREA. SANDIA NATL LABS, DEPT BATTERIES PROGRAM, ALBUQUERQUE, NM 87185 USA. RP Choi, YK (reprint author), UNIV NEW MEXICO, DEPT CHEM, ALBUQUERQUE, NM 87131 USA. NR 46 TC 36 Z9 36 U1 0 U2 3 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 EI 1945-7111 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD DEC PY 1995 VL 142 IS 12 BP 4107 EP 4112 DI 10.1149/1.2048472 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA TL120 UT WOS:A1995TL12000027 ER PT J AU Kocha, SS Peterson, MW Arent, DJ Redwing, JM Tischler, MA Turner, JA AF Kocha, SS Peterson, MW Arent, DJ Redwing, JM Tischler, MA Turner, JA TI Electrochemical investigation of the gallium nitride-aqueous electrolyte interface SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID SEMICONDUCTOR AB GaN (E(g) = similar to 3.4 eV) was photoelectrochemically characterized and the energetic position of its bandedges determined with respect to SHE. Electrochemical impedance spectroscopy was employed to analyze the interface, determine the space charge layer capacitance, and, subsequently obtain the flatband potential of GaN in different aqueous electrolytes. The flatband potential of GaN varied at an approximately Nernstian rate in aqueous buffer electrolytes of different pHs indicating acid-base equilibria at the interface. C1 ADV TECHNOL MAT INC,DANBURY,CT 06810. RP Kocha, SS (reprint author), NATL RENEWABLE ENERGY LAB,PHOTOCONVERS BRANCH,GOLDEN,CO 80401, USA. RI Kocha, Shyam/E-4347-2010 NR 23 TC 84 Z9 84 U1 0 U2 17 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 DEC PY 1995 VL 142 IS 12 BP L238 EP L240 DI 10.1149/1.2048511 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA TL120 UT WOS:A1995TL12000007 ER PT J AU Hitchcock, R Beltran, L AF Hitchcock, R Beltran, L TI Development of atrium daylighting prediction: From an algorithm to a design tool - Discussion SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Editorial Material RP Hitchcock, R (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 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 WIN PY 1995 VL 24 IS 1 BP 11 EP 12 PG 2 WC Optics SC Optics GA UA886 UT WOS:A1995UA88600002 ER PT J AU Berman, S AF Berman, S TI Visual performance and visual clarity under electric light sources .1. Visual performance - Discussion SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Editorial Material RP Berman, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 2 TC 0 Z9 0 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 WIN PY 1995 VL 24 IS 1 BP 77 EP 80 PG 4 WC Optics SC Optics GA UA886 UT WOS:A1995UA88600018 ER PT J AU Siminovitch, M Pankonin, E Praul, C Zhang, C AF Siminovitch, M Pankonin, E Praul, C Zhang, C TI Improving the performance of integral screw-base compact fluorescent lamps in a base-down burning position using thermal bridge systems SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article AB Many residential applications of the integral-ballast, screw-base compact fluorescent lamp (CFL) require base-down orientation, as exemplified by table and floor lamps. Positioning CFLs base down results in a 10-25 percent loss in lumen output, due to excess mercury vapor pressure in the lamp. These losses may limit consumers' acceptance of these new CFLs as a viable retrofit strategy. To mitigate output losses, researchers are developing thermal bridge systems that cool the small tubulation of the lamp, thereby optimizing mercury vapor pressure. Thermal bridge systems comprise small copper heat sinks that fit entirely within the integral-ballast compartment. Experiments indicated that most of the thermally based losses are recoverable, allowing for a lamp system that produces approximately the same lumen output regardless of orientation. As base-down positioning has wide residential application, the improved lumen output of these lamps would have a significant impact on residential retrofits. RP Siminovitch, M (reprint author), LAWRENCE BERKELEY LAB,LIGHTING RES GRP,BERKELEY,CA, USA. NR 3 TC 0 Z9 0 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 WIN PY 1995 VL 24 IS 1 BP 94 EP & PG 4 WC Optics SC Optics GA UA886 UT WOS:A1995UA88600021 ER PT J AU DeLong, KW Trebino, R White, WE AF DeLong, KW Trebino, R White, WE TI Simultaneous recovery of two ultrashort laser pulses from a single spectrogram SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID LIGHT-PULSES; PHASE RETRIEVAL; QUANTUM-WELLS; INTENSITY; AMPLITUDE AB We introduce a technique for simultaneously measuring the time-dependent intensity and phase of two independent and arbitrary ultrashort laser pulses from a single measured spectrogram. This two-pulse method is mathematically equivalent to the problem of blind deconvolution, and we use an algorithm analogous to those used for deblurring two-dimensional images to recover the two pulses. We demonstrate the method by simultaneously retrieving the intensity and the phase of two different pulses from a Ti:sapphire laser, one of which is chirped by propagation through glass. (C) 1995 Optical Society of America C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DeLong, KW (reprint author), SANDIA NATL LABS,MS 9057,LIVERMORE,CA 94551, USA. NR 24 TC 52 Z9 52 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD DEC PY 1995 VL 12 IS 12 BP 2463 EP 2466 DI 10.1364/JOSAB.12.002463 PG 4 WC Optics SC Optics GA TK401 UT WOS:A1995TK40100019 ER PT J AU Chang, CH Moore, RL AF Chang, CH Moore, RL TI Numerical simulation of gas and particle flow in a high-velocity oxygen-fuel (HVOF) torch SO JOURNAL OF THERMAL SPRAY TECHNOLOGY LA English DT Article DE gas-particle interactions; HVOF; modeling; multicomponent flow ID MULTICOMPONENT AB A transient two-dimensional numerical simulation of Inconel spraying in a high-velocity oxygen-fuel (HVOF) torch barrel was performed. The gas now is treated as a continuum multicomponent chemically reacting flow, whereas particles are modeled using a stochastic particle spray model, fully coupled to the gas flow. The calculated results agree well with experimental data and show important statistical aspects of particle now in the torch. C1 IDAHO NATL ENGN LAB, IDAHO FALLS, ID 83415 USA. NR 22 TC 19 Z9 19 U1 2 U2 7 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1059-9630 EI 1544-1016 J9 J THERM SPRAY TECHN JI J. Therm. Spray Technol. PD DEC PY 1995 VL 4 IS 4 BP 358 EP 366 DI 10.1007/BF02648636 PG 9 WC Materials Science, Coatings & Films SC Materials Science GA TN117 UT WOS:A1995TN11700006 ER PT J AU EYRE, RJ STEVENS, DK PARKER, JC BULL, RJ AF EYRE, RJ STEVENS, DK PARKER, JC BULL, RJ TI ACID-LABILE ADDUCTS TO PROTEIN CAN BE USED AS INDICATORS OF THE CYSTEINE S-CONJUGATE PATHWAY OF TRICHLOROETHENE METABOLISM SO JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH LA English DT Article ID COVALENT BINDING; CARCINOGEN TRICHLOROETHYLENE; DNA INVITRO; INVIVO; RATS; MICE; TRICHLOROACETATE; DICHLOROACETATE; MACROMOLECULES; NEPHROTOXICITY AB Covalent binding of radiolabel to tissue proteins following [C-14]trichloroethene (TRI) exposure has been used as a measure of TRI activation. Cross binding of C-14 label does not differentiate between alternate routes of metabolism and can be confounded when there is significant metabolic incorporation of radiolabel. We examined the covalent association of C-14 label to hepatic and renal proteins in male F344 rats and B6C3F1 mice following oral treatment with [C-14]TRI and three metabolites of TRI: [C-14]trichloroacetate (TCA), [C-14]dichloroacetate (DCA) and [C-14]dichlorovinylcysteine (DCVC) in vivo. Association of radiolabel from [C-14]TRI with hepatic proteins reached a maximum at 2 and 4 h in moose and rat hepatic proteins, respectively. Association of radiolabel with renal proteins reached a maximum at 8 h in both species. An approach was developed based upon formation of protein adducts that release acetate and monochloroacetate (MCA) on acid hydrolysis. These adducts were found to be specifically associated with the activation of DCVC to reactive intermediates. Acetate and MCA were identified by using two different conditions of high-performance liquid chromatography (HPLC) separation with differing selectivity. Diethylmaleate and aminooxyacetic acid pretreatment inhibited the formation of these adducts from TRI, consistent with requirements for glutathione and P-lyase. No evidence of these adducts was detected following [C-14]TCA and [C-14]DCA treatment. Renal acid-labile adduct formation from 25 mg/kg DCVC was approximately 12-fold greater in male B6C3F1 mice than in male F344 rats. They accounted for 7.8 and 4.6% of the total adducts to renal protein in rats and mice, respectively. Acid-labile adducts formed from 1000 mg/kg TRI were approximately two times greater in mice than rats. In this case, they accounted for 1.4 and 3.3% of the total adduct formed in renal proteins from TRI (corrected for metabolic incorporation), respectively. This greater dilution of adducts associated with DCVC in renal proteins of the rat suggests that covalent binding of TRI has less specificity for the DCVC pathway in rats than in mice. C1 PACIFIC NW LAB, DIV HLTH, RICHLAND, WA 99352 USA. US EPA, NATL CTR ENVIRONM ASSESSMENT, WASHINGTON, DC 20460 USA. WASHINGTON STATE UNIV, PHARMACOL TOXICOL GRAD PROGRAM, PULLMAN, WA 99164 USA. NR 32 TC 20 Z9 21 U1 0 U2 1 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0098-4108 J9 J TOXICOL ENV HEALTH JI J. Toxicol. Environ. Health PD DEC PY 1995 VL 46 IS 4 BP 443 EP 464 PG 22 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA TK076 UT WOS:A1995TK07600004 PM 8523471 ER PT J AU EYRE, RJ STEVENS, DK PARKER, JC BULL, RJ AF EYRE, RJ STEVENS, DK PARKER, JC BULL, RJ TI RENAL ACTIVATION OF TRICHLOROETHENE AND S-(1,2-DICHLOROVINYL)-L-CYSTEINE AND CELL PROLIFERATIVE RESPONSES IN THE KIDNEYS OF F344 RATS AND B6C3F1 MICE SO JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH LA English DT Article ID CONJUGATE BETA-LYASE; REGIOISOMERIC MERCAPTURIC ACIDS; URINARY METABOLITE; MOUSE KIDNEY; CYSTEINE; NEPHROTOXICITY; TOXICITY; IDENTIFICATION; MUTAGENICITY; LOCALIZATION AB Covalent binding of reactive intermediates formed by renal beta-lyase activation of S-(1,2-dichlorovinyl)-L-cysteine (DCVC) has been suggested to be responsible for the greater renal sensitivity of rats than mice to the carcinogenic effects of chronic treatment with trichloroethene (TRI). Previous work demonstrated that the activation of DCVC results in acid-labile adducts to protein that can be distinguished from adducts formed by other pathways of TRI metabolism. By analyzing acid-labile adduct formation, the relationship between DCVC formation and activation from TRI and increases in rates of cell division in the kidneys of male F344 rats and B6C3F1 mice could be investigated. The delivered dose of DCVC from an oral dose of 1000 mg/kg TRI was approximately six times greater in rats than mice. However, renal activation of DCVC in mice was approximately 12 times greater than in rats. Therefore, the overall activation of TRI was about two times greater in mice than rats. induction of cell replication in liver and kidney following doses of 1, 5, or 25 mg/kg DCVC or 1000 mg/kg TRI was also measured through the use of miniosmotic pumps that delivered BrdU subcutaneously for 3 d. Acid-labile adduct formation from DCVC and TRI displayed a consistent relationship with increased cell replication in mice and between mice and rats. Both cell replication and acid-labile adduct formation in rats given 25 mg/kg DCVC were approximately equal to that observed in mice given 1 mg/kg. Increased cell replication was not observed in rats receiving 1 or 5 mg/kg DCVC or 1000 mg/kg TRI, nor were there histological signs of nephrotoxicity. Thus, net activation of TRI by the cysteine S-conjugate pathway was found to be greater in mice than rats and these findings appeared related to differences in cell proliferative responses of the kidneys of the two species. Based on these data, it would appear that other factors must contribute to the greater sensitivity of the rat to the induction of renal carcinogenesis by TRI. C1 PACIFIC NW LAB, DIV HLTH, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV, PHARMACOL TOXICOL GRAD PROGRAM, PULLMAN, WA 99164 USA. US EPA, NATL CTR ENVIRONM ASSESSMENT, WASHINGTON, DC 20460 USA. NR 35 TC 23 Z9 25 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0098-4108 J9 J TOXICOL ENV HEALTH JI J. Toxicol. Environ. Health PD DEC PY 1995 VL 46 IS 4 BP 465 EP 481 PG 17 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA TK076 UT WOS:A1995TK07600005 PM 8523472 ER PT J AU Battaglia, LL Keough, JR Pritchett, DW AF Battaglia, LL Keough, JR Pritchett, DW TI Early secondary succession in a southeastern US alluvial floodplain SO JOURNAL OF VEGETATION SCIENCE LA English DT Article DE bottomland hardwood; hydrologic gradient; microtopography; old-field; succession; wetland ID VEGETATION AB Species number, turnover and early successional patterns were examined over the first five years of old-field succession in a former bottomland hardwood forest. Number of species, measured by walk-through surveys, increased up to Year 3, but decreased in Years 4 and 5. Species turnover in 20 quadrats indicated that species' invasions remained high throughout the study, while losses of species were initially high but declined. Detrended Correspondence Analysis (DCA) on species cover in each year showed the existence of a compositional gradient that could be significantly related to relative elevation, an indirect measure of hydrology, in Years 2, 3, 4, and 5. DCA of the pooled five-year species cover data showed greater compositional changes in lower elevation quadrats, and those higher elevation quadrats dominated by the woody vine, Campsis radicans, remained similar over time. C1 NATL BIOL SURVEY,NO PRAIRIE SCI CTR,JAMESTOWN,ND 58401. NE LOUISIANA UNIV,MONROE,LA 71209. RP Battaglia, LL (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802, USA. NR 40 TC 16 Z9 16 U1 1 U2 10 PU OPULUS PRESS UPPSALA AB PI KNIVSTA PA APELSINVAGEN 47, S 741 00 KNIVSTA, SWEDEN SN 1100-9233 J9 J VEG SCI JI J. Veg. Sci. PD DEC PY 1995 VL 6 IS 6 BP 769 EP 776 DI 10.2307/3236390 PG 8 WC Plant Sciences; Ecology; Forestry SC Plant Sciences; Environmental Sciences & Ecology; Forestry GA TV493 UT WOS:A1995TV49300001 ER PT J AU YAMADA, T WHEELER, CM HALPERN, AL STEWART, ACM HILDESHEIM, A JENISON, SA AF YAMADA, T WHEELER, CM HALPERN, AL STEWART, ACM HILDESHEIM, A JENISON, SA TI HUMAN PAPILLOMAVIRUS TYPE-16 VARIANT LINEAGES IN UNITED-STATES POPULATIONS CHARACTERIZED BY NUCLEOTIDE-SEQUENCE ANALYSIS OF THE E6, L2, AND L1 CODING SEGMENTS SO JOURNAL OF VIROLOGY LA English DT Article ID CERVICAL INTRAEPITHELIAL NEOPLASIA; COTTONTAIL RABBIT PAPILLOMAVIRUS; VIRUS-LIKE PARTICLES; OPEN READING FRAME; CAPSID PROTEINS; GENE-PRODUCTS; DNA-SEQUENCE; HPV E6; CANCER; ANTIBODIES AB Human papillomavirus type 16 (HPV16) nucleotide sequence variations in the E6 (nucleotide positions [nt] 104 to 559), L2 (nt 4272 to 5657), and L1 (nt 5665 to 7148) open reading frames (ORFs), and the long control region (nt 7479 to 7842), were examined in 29 selected United States isolates. Of 3,690 nucleotide positions, 129 (3.5%) varied. The maximum pairwise distance was 66 nucleotide differences, or 1.8%. Nucleotide variations within different genome segments were phylogenetically compatible, and nucleotide changes within E6, L2, and L1 contained phylogenetic information beyond that provided in the long control region. Most isolates were classified as members of HPV16 lineages that have been described previously. However, two novel phylogenetic branches were identified. The L2 ORF was the most variable coding segment. L2 synonymous and nonsynonymous nucleotide changes were distributed asymmetrically. The amino-terminal half of the L2 protein was remarkably conserved-among all isolates, suggesting that the region is under evolutionary constraint. The amino terminal region of the E6 ORF was relatively varied, especially at E6 amino acid positions 10 and 14. Several amino acid differences in the L1 ORF were observed between lineages. Forty-nine amino acid variations across all sequenced coding regions were observed. These amino acid differences may be relevant to differences in the generation of humoral or cell-mediated immune responses to HPV16 variants. Our data form a basis for considering HPV16 sequence variation in the rational design of vaccine strategies and as an epidemiologic correlate of cervical cancer risk. C1 UNIV NEW MEXICO,CTR CANC RES & TREATMENT,DEPT CELL BIOL,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,SCH MED,DEPT MED,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,SCH MED,DEPT MICROBIOL,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,SCH MED,DEPT CELL BIOL,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NCI,DIV CANC ETIOL,EPIDEMIOL & BIOSTAT PROGRAM,BETHESDA,MD 20892. FU NCI NIH HHS [CA57975]; NIAID NIH HHS [AI32917] NR 78 TC 172 Z9 180 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD DEC PY 1995 VL 69 IS 12 BP 7743 EP 7753 PG 11 WC Virology SC Virology GA TE366 UT WOS:A1995TE36600043 PM 7494284 ER PT J AU Pekow, CA Weller, RE Schulte, SJ Lee, SP AF Pekow, CA Weller, RE Schulte, SJ Lee, SP TI Dietary induction of cholesterol gallstones in the owl monkey: Preliminary findings in a new animal model SO LABORATORY ANIMAL SCIENCE LA English DT Article ID AFRICAN-GREEN MONKEY; BILIARY SLUDGE; BILE; SATURATION; AOTUS AB The owl monkey (Aotus nancymae) is a primate with a bile acid and biliary lipid profile resembling that of humans. Aotus spp, are among the rare species, including humans, that spontaneously develop cholesterol gallstones. With dietary induction the owl monkey proved a rapid, reliable model of cholesterol cholelithiasis. Six owl monkeys, three of each sex, were fed a diet supplemented with 1.5% cholesterol for 5 weeks. Each week blood samples were drawn for cholesterol determination, and bile samples were obtained by ultrasound-guided percutaneous aspiration of the gallbladder. Weekly ultrasound imaging documented development of gallbladder sludge in all animals, with eventual stone formation in five of six. At necropsy after 5 weeks consuming the diet, all animals had distinct sludging and/or small stones in the gallbladder, correlating with the ultrasound findings. Plasma cholesterol values remained lower in females but increased markedly in some males to >1,400 mg/dl. Histologic examination revealed mild, diffuse hepatocellular lipidosis and degeneration in four of six animals. Detailed examination of the gallbladder indicated that transhepatic needle punctures induced minimal focal abnormalities, judged inconsequential. In contrast to rodent models commonly in use, owl monkeys have liver and digestive tract anatomy and bile physiology that is similar to that in humans. These similarities give this model the potential to substantively improve understanding of the pathogenesis, treatment, and prevention of human cholesterol gallstones. This model can provide sequential, simultaneous correlation of plasma and biliary lipids, imaging of gallbladder contents, and physiologic processes. C1 VET AFFAIRS MED CTR, SERV RADIOL, SEATTLE, WA 98108 USA. VET AFFAIRS MED CTR, MED SERV, SEATTLE, WA 98108 USA. VET AFFAIRS MED CTR, GASTROENTEROL SECT, SEATTLE, WA 98108 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP Pekow, CA (reprint author), VET AFFAIRS MED CTR, RES & DEV SERV, SEATTLE, WA 98108 USA. NR 22 TC 2 Z9 4 U1 2 U2 4 PU AMER ASSOC LABORATORY ANIMAL SCIENCE PI CORDOVA PA 70 TIMBERCREEK DR, SUITE 5, CORDOVA, TN 38018 SN 0023-6764 J9 LAB ANIM SCI JI Lab. Anim. Sci. PD DEC PY 1995 VL 45 IS 6 BP 657 EP 662 PG 6 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA TL467 UT WOS:A1995TL46700007 PM 8746526 ER PT J AU Mosher, JC AF Mosher, JC TI Review of MLAB SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Software Review RP Mosher, JC (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,BIOPHYS GRP P21,MAIL STOP M715,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0895-7533 J9 LAB ROBOTICS AUTOMAT JI Lab. Robot. Autom. PD DEC PY 1995 VL 7 IS 6 BP 309 EP 311 PG 3 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA UE678 UT WOS:A1995UE67800004 ER PT J AU Pfeifer, KB AF Pfeifer, KB TI Heat of adsorption and thin film surface area studies of a silica sol-gel film exposed to HCl and H2O SO LANGMUIR LA English DT Article ID BET AB Heat of adsorption and surface area studies have been undertaken for H2O and HCl adsorbing on a Stober sol-gel film coated on a surface acoustic wave (SAW) device. Adsorption isotherms measured with the SAW device are compared to the adsorption model of Brunauer, Emmett, and Teller(BET). The heat of adsorption for the first monolayer of H2O and HCl was found to be 14.6 and 5.3 kcal/mol, respectively. The surface area of the film was also determined using the BET model. Results are compared to surface areas calculated from the film thickness and particle size. RP Pfeifer, KB (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 8 Z9 8 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD DEC PY 1995 VL 11 IS 12 BP 4793 EP 4796 DI 10.1021/la00012a034 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA TM371 UT WOS:A1995TM37100034 ER PT J AU Nave, SE ORourke, PE Toole, WR AF Nave, SE ORourke, PE Toole, WR TI Sampling probes enhance remote chemical analyses SO LASER FOCUS WORLD LA English DT Article RP Nave, SE (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,ANALYT DEV SECT,AIKEN,SC 29808, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD DEC PY 1995 VL 31 IS 12 BP 83 EP 88 PG 6 WC Optics SC Optics GA TW244 UT WOS:A1995TW24400022 ER PT J AU Floyd, S Warmuth, M AF Floyd, S Warmuth, M TI Sample compression, learnability, and the Vapnik-Chervonenkis dimension SO MACHINE LEARNING LA English DT Article DE sample compression; Vapnik-Chervonenkis dimension; pac-learning AB Within the framework of pac-learning, we explore the learnability of concepts from samples using the paradigm of sample compression schemes. A sample compression scheme of size Ic for a concept class C subset of or equal to 2(X) consists of a compression function and a reconstruction function. The compression function receives a finite sample set consistent with some concept in C and chooses a subset of k examples as the compression set. The reconstruction function forms a hypothesis on X from a compression set of Ic examples. For any sample set of a concept in C the compression set produced by the compression function must lead to a hypothesis consistent with the whole original sample set when it is fed to the reconstruction function. We demonstrate that the existence of a sample compression scheme of fixed-size for a class C is sufficient to ensure that the class C is pac-learnable. Previous work has shown that a class is pac-learnable if and only if the Vapnik-Chervonenkis (VC) dimension of the class is finite. In the second half of this paper we explore the relationship between sample compression schemes and the VC dimension. We define maximum and maximal classes of VC dimension d. For every maximum class of VC dimension cl, there is a sample compression scheme of size d, and for sufficiently-large maximum classes there is no sample compression scheme of size less than d. We discuss briefly classes of VC dimension d that are maximal but not maximum. It is an open question whether every class of VC dimension d has a sample compression scheme of size O(d). C1 UNIV CALIF SANTA CRUZ, DEPT COMP SCI, SANTA CRUZ, CA 95064 USA. RP Floyd, S (reprint author), LAWRENCE BERKELEY LAB, M-S 46A-1123, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 32 TC 94 Z9 95 U1 0 U2 2 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0885-6125 EI 1573-0565 J9 MACH LEARN JI Mach. Learn. PD DEC PY 1995 VL 21 IS 3 BP 269 EP 304 PG 36 WC Computer Science, Artificial Intelligence SC Computer Science GA TM469 UT WOS:A1995TM46900003 ER PT J AU Roy, R Tropper, FD Williams, AJ AF Roy, R Tropper, FD Williams, AJ TI Substituent-induced chemical shifts of aromatic carbon centres in a series of non-acetylated and peracetylated Para-substituted aryl 2-N-acetamido-2-deoxy-beta-D-glucopyranosides SO MAGNETIC RESONANCE IN CHEMISTRY LA English DT Note DE NMR; substituent-induced chemical shifts 2-N-acetamido-2-deoxy-beta-D-glucopyranosides ID NUCLEAR MAGNETIC-RESONANCE; PHASE-TRANSFER CATALYSIS; C-13 AB The additive behaviour generally observed for the substituent-induced chemical shifts (SCS) for disubstituted benzenes was examined for a series of aryl 2-N-acetamido-2-deoxy-beta-D-glucopyranosides having a wide range of para substituents with varying possible electronic contributions. The SCS values associated with nonacetylated and peracetylated glucoside rings in para-substituted aryl 2-N-acetamido-2-deoxy-beta-D-glucopyranosides were calculated. The additive nature of SCS analysis for para-substituted systems was shown to hold for the meta and para positions but the very small change in chemical shifts for the ortho positions precluded attempts at analysis of these data. The observation of a good correlation for the ipso carbons for the acetylated compounds compared with a poor correlation for the same site in the non-acetylated compounds is not well understood. C1 EASTMAN KODAK CO,DIV ANALYT TECHNOL,ROCHESTER,NY 14650. UNIV OTTAWA,DEPT CHEM,OTTAWA,ON K1N 6N5,CANADA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Williams, Antony/C-3089-2009 OI Williams, Antony/0000-0002-2668-4821 NR 13 TC 0 Z9 0 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0749-1581 J9 MAGN RESON CHEM JI Magn. Reson. Chem. PD DEC PY 1995 VL 33 IS 12 BP 981 EP 984 DI 10.1002/mrc.1260331208 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA TK671 UT WOS:A1995TK67100007 ER PT J AU Butler, MJ Hunt, JH Herrnkind, WF Childress, MJ Bertelsen, R Sharp, W Matthews, T Field, JM Marshall, HG AF Butler, MJ Hunt, JH Herrnkind, WF Childress, MJ Bertelsen, R Sharp, W Matthews, T Field, JM Marshall, HG TI Cascading disturbances in Florida bay, USA: Cyanobacteria blooms, sponge mortality, and implications for juvenile spiny lobsters Panulirus argus SO MARINE ECOLOGY PROGRESS SERIES LA English DT Article DE Florida Bay; sponge; spiny lobster; disturbance; cyanobacteria; artificial shelters; algal bloom ID SEAGRASS THALASSIA-TESTUDINUM; PHOSPHORUS LIMITATION; POPULATION-DYNAMICS; EVERGLADES AB Florida Bay, the shallow lagoon separating mainland Florida and the Florida Keys, USA, is experiencing an unprecedented series of ecological disturbances. In 1991, following reports of other ecosystem perturbations, we observed widespread and persistent blooms of cyanobacteria that coincided with the decimation of sponge communities over hundreds of square kilometers. Juvenile Caribbean spiny lobsters Panulirus argus, among other animals, rely on sponges for shelter; the impact of sponge loss on the abundance of lobsters and their use of shelter, in particular, has been dramatic. The loss of sponges on 27 experimental sites in hard bottom habitat in central Florida Bay resulted in the redistribution of juvenile lobsters among the remaining shelters, an influx of lobsters into sites where artificial shelters were present, and a decline in lobster abundances on sites without artificial shelters. Diver surveys of sponge damage at additional sites in central Florida Bay confirmed that the sponge die-off was widespread and its occurrence coincided with areas that had been exposed to the cyanobacteria bloom. This cascade of disturbances has dramatically altered the community structure of affected hard bottom areas and demonstrates the coupled dynamics of this shallow marine ecosystem. C1 FLORIDA DEPT ENVIRONM PROTECT, S FLORIDA REG LAB, FLORIDA MARINE RES INST, MARATHON, FL 33050 USA. FLORIDA STATE UNIV, DEPT BIOL SCI, TALLAHASSEE, FL 32306 USA. OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. RP Butler, MJ (reprint author), OLD DOMINION UNIV, DEPT BIOL SCI, NORFOLK, VA 23529 USA. NR 44 TC 134 Z9 137 U1 3 U2 19 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0171-8630 J9 MAR ECOL PROG SER JI Mar. Ecol.-Prog. Ser. PD DEC PY 1995 VL 129 IS 1-3 BP 119 EP 125 DI 10.3354/meps129119 PG 7 WC Ecology; Marine & Freshwater Biology; Oceanography SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography GA TP664 UT WOS:A1995TP66400014 ER PT J AU Sugama, T AF Sugama, T TI Pectin copolymers with organosiloxane grafts as corrosion-protective coatings for aluminum SO MATERIALS LETTERS LA English DT Article ID POLYMETALLOSILOXANE COATINGS; COPPER; BEHAVIOR; ACID AB When polygalacturonic acid methyl ester (pectin, PE), selected from among the natural polymers, is used as environmentally benign water-based coating material to protect aluminum (Al) alloys against corrosion, it is necessary to incorporate an antimicrobial agent into its aqueous solution to prevent the growth of microorganisms. in this study, N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole (TSPI) was used as the antimicrobial agent. However, TSPI also played an important role in ensuring that TSPI-modified PE coatings adequately protect Al; this function was due to a combination of the following three factors: (1) the removal of hydrophilic groups from PE by a chemical reaction between OH or COOH groups in PE, and silanol hydrolysate in TSPI, (2) the grafting of polyorganosiloxane (POS) into the PE polymer chains, and (3) the interfacial covalentoxane bonds formed by interactions between the silanol end groups in the POS graft and Al2O3 at the surface of Al substrates. RP Sugama, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 18 TC 10 Z9 10 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD DEC PY 1995 VL 25 IS 5-6 BP 291 EP 299 DI 10.1016/0167-577X(95)00173-5 PG 9 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA TL975 UT WOS:A1995TL97500020 ER PT J AU SINGH, KK PRADEEP, T SINHA, APB MORRIS, DE HRILJAC, JA AF SINGH, KK PRADEEP, T SINHA, APB MORRIS, DE HRILJAC, JA TI HMTTEF.C-60-A 2-D CLOSE-PACKED LAYERED COMPOUND OF C-60 SO MATERIALS RESEARCH BULLETIN LA English DT Article DE CARBONSIXTY; CHARGE-TRANSFER COMPLEX; HEXAMETHYLENETETRATELLURAFULVALENE; PARAMAGNETIC ID CRYSTAL AB The analysis of high resolution synchrotron X-ray powder diffraction data of HMTTEF.C-60 (HMTTEF = hexamethylenetetratellurafulvalene) gave a triclinic unit cell with a 9.9297 Angstrom, b = 9.9359 Angstrom, c = 13.1472 Angstrom, a = 106.966 degrees, beta = 95.887 degrees and gamma = 118.252 degrees in the space group PT. Steric considerations suggest that there is a nearly close-packed layer of C-60 molecules in the ab plane, and HMTTEF molecules are sandwiched between layers of C-60. The compound is insulating and weakly paramagnetic and the charge-transfer is small. C1 BROOKHAVEN NATL LAB,DEPT PHYS,NEW YORK,NY 11973. INDIAN INST TECHNOL,MADRAS 600036,TAMIL NADU,INDIA. RP SINGH, KK (reprint author), MORRIS RES INC,1918 UNIV AVE,BERKELEY,CA 94703, USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0025-5408 J9 MATER RES BULL JI Mater. Res. Bull. PD DEC PY 1995 VL 30 IS 12 BP 1547 EP 1552 DI 10.1016/0025-5408(95)00149-2 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA TJ380 UT WOS:A1995TJ38000011 ER PT J AU Fougere, GE Riester, L Ferber, M Weertman, JR Siegel, RW AF Fougere, GE Riester, L Ferber, M Weertman, JR Siegel, RW TI Young's modulus of nanocrystalline Fe measured by nanoindentation SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Symposium on Engineering of Nanostructured Materials CY NOV 28-30, 1994 CL BOSTON, MA SP USN, Off Naval Res, Nanophase Technol Corp DE Young's modulus; nanoindentation; iron ID ELASTIC-MODULUS; POROSITY; DISPLACEMENT AB Nanoindentation techniques were used to measure Young's modulus for nanocrystalline Fe samples produced by inert-gas condensation and warm consolidation. The samples had grain sizes of 4-20 nm and residual porosity of 2-30% calculated relative to conventional Fe. Values of Young's modulus for the nanocrystalline Fe are reduced relative to that of conventional, fully dense Fe. A review of Young's modulus for other nanocrystalline materials showed similar trends. Published results for porous conventional Fe showed similar reductions in Young's modulus for samples with comparable porosity levels. The observed reductions in Young's modulus for both the nanocrystalline and the conventional porous Fe can be described adequately by several theories utilizing spheroidal porosity. C1 NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. OAK RIDGE NATL LAB, HIGH TEMP MAT LAB, OAK RIDGE, TN 37831 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RI Weertman, Julia/B-7540-2009 NR 27 TC 104 Z9 110 U1 5 U2 18 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1995 VL 204 IS 1-2 BP 1 EP 6 DI 10.1016/0921-5093(95)09927-1 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TN895 UT WOS:A1995TN89500002 ER PT J AU Sanders, PG Witney, AB Weertman, JR Valiev, RZ Siegel, RW AF Sanders, PG Witney, AB Weertman, JR Valiev, RZ Siegel, RW TI Residual stress, strain and faults in nanocrystalline palladium and copper SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Symposium on Engineering of Nanostructured Materials CY NOV 28-30, 1994 CL BOSTON, MA SP USN, Off Naval Res, Nanophase Technol Corp DE nanocrystalline; faults; strain; palladium; copper AB Nanocrystalline Pd and Cu, prepared by inert-gas condensation and warm compaction, were studied using X-ray diffraction techniques. A sample of Cu with submicrometer grain size produced by severe plastic deformation was also examined. The Warren-Averbach technique was used to separate the line broadening due to grain size, t.m.s. strain and faults. Peak shifts and asymmetry were used to determine the long-range surface stresses, stacking-fault probability and twin probability. Young's modulus for a Pd sample was determined by an ultrasonic technique and compared with the coarse-grained, fully dense value. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RUSSIAN ACAD SCI,INST MET SUPERPLAST,UFA 450001,RUSSIA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Weertman, Julia/B-7540-2009 NR 16 TC 61 Z9 61 U1 2 U2 15 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 DEC PY 1995 VL 204 IS 1-2 BP 7 EP 11 DI 10.1016/0921-5093(95)09928-X PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TN895 UT WOS:A1995TN89500003 ER PT J AU Luo, P Nieh, TG Schwartz, AJ Lenk, TJ AF Luo, P Nieh, TG Schwartz, AJ Lenk, TJ TI Surface characterization of nanostructured metal and ceramic particles SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Symposium on Engineering of Nanostructured Materials CY NOV 28-30, 1994 CL BOSTON, MA SP USN, Off Naval Res, Nanophase Technol Corp DE ceramic particles; surface characterization; metal particles AB In the present study, nanocrystalline Al; TIN and SiC particles produced by different techniques were examined using X-ray diffraction analysis, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The average particle size and size distribution were measured for these nanoparticles. In addition, the surfaces of these particles were characterized by X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy. An amorphous layer was normally found to form on the surface of the nanocrystalline particles. The layer thickness, depending upon the material, is sometimes non-uniform. The chemical states of the surface atoms on Al, TIN, and SiC were also determined by XPS. C1 RAYCHEM CORP,MENLO PK,CA 94025. RP Luo, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 6 TC 12 Z9 17 U1 0 U2 9 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 DEC PY 1995 VL 204 IS 1-2 BP 59 EP 64 DI 10.1016/0921-5093(95)09938-7 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TN895 UT WOS:A1995TN89500013 ER PT J AU Phillpot, SR Wang, J Wolf, D Gleiter, H AF Phillpot, SR Wang, J Wolf, D Gleiter, H TI Computer simulation of the structure and dynamical properties of grain boundaries in a nanocrystalline model material SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Symposium on Engineering of Nanostructured Materials CY NOV 28-30, 1994 CL BOSTON, MA SP USN, Off Naval Res, Nanophase Technol Corp DE grain boundaries; computer simulation; molecular-dynamics; nanocrystalline materials ID SIZED CRYSTALLINE MATERIALS; SPECTROSCOPY; PALLADIUM AB Molecular dynamics simulations have been used to synthesize and characterize a fully dense, three-dimensional nanocrystalline material with an average grain size of 43 Angstrom by crystallization from the melt. The structures and energies of the highly constrained grain boundaries in this material are found to be more isotropic than those of extended boundaries in bicrystals. Based on this observation, a simple structural model that combines a realistic treatment of the grain boundaries with a finite grain size-and yet permits a comparison with the structures of unconstrained boundaries in bicrystals-is developed. The low temperature thermal behavior of such a model material is shown to be dominated by low frequency phonon modes due to the grain boundaries and grain junctions. C1 FORSCHUNGSZENTRUM,D-76021 KARLSRUHE,GERMANY. RP Phillpot, SR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Phillpot, Simon/J-9117-2012 NR 26 TC 27 Z9 29 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1995 VL 204 IS 1-2 BP 76 EP 82 DI 10.1016/0921-5093(95)09941-7 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TN895 UT WOS:A1995TN89500016 ER PT J AU Liu, J Wang, LQ Bunker, BC Graff, GL Virden, JW Jones, RH AF Liu, J Wang, LQ Bunker, BC Graff, GL Virden, JW Jones, RH TI Effect of hydrolysis on the colloidal stability of fine alumina suspensions SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Symposium on Engineering of Nanostructured Materials CY NOV 28-30, 1994 CL BOSTON, MA SP USN, Off Naval Res, Nanophase Technol Corp DE hydrolysis; colloidal stability; fine alumina suspensions ID FORCES AB This paper investigates the effect of hydrolysis and the formation of hydrated polycations on the colloidal stability and theological properties of fine alumina suspensions. This is an important phenomenon in colloidal processing of advanced ceramic materials and nanocomposite materials from fine particles. The aging process and the formation of large polycations in the solution are monitored by nuclear magnetic resonance, and the aggregation rate and viscosity of the suspension are measured under similar conditions. It is observed that aging under acidic conditions increases colloidal stability against aggregation in dispersed suspensions, and reduces the viscosity in flocculated suspensions. This behavior corresponds well to the formation of large polynuclear species through hydrolysis. It is suggested that the hydrated polycations significantly modify the total interaction energy between two particles at short separation distances. RP Liu, J (reprint author), PACIFIC NW LAB, DEPT MAT SCI, BATTELLE BLVD, BOX 999, RICHLAND, WA 99352 USA. NR 10 TC 3 Z9 3 U1 2 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1995 VL 204 IS 1-2 BP 169 EP 175 DI 10.1016/0921-5093(95)09955-7 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TN895 UT WOS:A1995TN89500030 ER PT J AU Hwang, JH Mason, TO Buehler, MF Darab, JG Matson, DW Linehan, JC AF Hwang, JH Mason, TO Buehler, MF Darab, JG Matson, DW Linehan, JC TI Characterization of humidity-sensing NiO-Ni(OH)(2) nanocomposites by impedance spectroscopy SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Symposium on Engineering of Nanostructured Materials CY NOV 28-30, 1994 CL BOSTON, MA SP USN, Off Naval Res, Nanophase Technol Corp DE impedance spectroscopy; powders; thermal decomposition ID CERAMICS; SENSORS; POWDERS AB Nanocomposites of NiO and Ni(OH)(2) prepared by compaction of powders synthesized by rapid thermal decomposition of precursors in solution (RTDS) were characterized by impedance spectroscopy at room temperature. The marked decrease of resistivity with increasing humidity was attributed to an increase of the water phase and ionic transport therein. Electrical behavior was modeled in terms standard electrocomposite mixing laws. C1 PACIFIC NW LAB, MAT & CHEM SCI CTR, RICHLAND, WA 99352 USA. RP Hwang, JH (reprint author), NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. RI Mason, Thomas/B-7528-2009 NR 21 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1995 VL 204 IS 1-2 BP 252 EP 257 DI 10.1016/0921-5093(95)09970-0 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TN895 UT WOS:A1995TN89500045 ER PT J AU Tuttle, BA AlShareef, HN Warren, WL Raymond, MV Headley, TJ Voigt, JA Evans, J Ramesh, R AF Tuttle, BA AlShareef, HN Warren, WL Raymond, MV Headley, TJ Voigt, JA Evans, J Ramesh, R TI La0.5Sr0.5CoO3 electrode technology for Pb(Zr,Ti)O-3 thin film nonvolatile memories SO MICROELECTRONIC ENGINEERING LA English DT Article; Proceedings Paper CT 1st European Meeting on Integrated Ferroelectrics (EMIF 1), at the 8th European Meeting on Ferroelectrics (EMF 8) CY JUL 03-05, 1995 CL UNIV NIJMEGEN, FAC SCI, NIJMEGEN, NETHERLANDS SP European Commiss, GEC Marconi, Philips Res, Siemens, Thomson CSF, Univ Nijmegen Univ, Fac Sci HO UNIV NIJMEGEN, FAC SCI AB Oxide electrode technology is investigated for optimization of Pb(Zr,Ti)O-3 (PZT) thin film capacitor properties for high density nonvolatile memory applications. PZT thin film capacitors with RF sputter deposited La0.5Sr0.5CoO3 (LSCO) electrodes have been characterized with respect to the following parameters: initial dielectric hysteresis loop characteristics, fatigue performance, microstructure and imprint behavior. Our studies have determined that the fatigue of PZT capacitors with LSCO electrodes is less sensitive to B site cation ratio and underlying electrode stack technology than with RuO2 electrodes. Doping PZT thin films with Nb (PNZT) improves imprint behavior of LSCO/PZT/LSCO capacitors considerably. We have demonstrated that PNZT 4/30/70//LSCB capacitors thermally processed at either 550 degrees C or 675 degrees C have almost identical initial hysteresis properties and exhibit essentially no fatigue out to approximately 10(10) cycles. RP Tuttle, BA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. RI Alshareef, Husam Niman/A-2000-2015 OI Alshareef, Husam Niman/0000-0001-5029-2142 NR 10 TC 13 Z9 13 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9317 J9 MICROELECTRON ENG JI Microelectron. Eng. PD DEC PY 1995 VL 29 IS 1-4 BP 223 EP 230 DI 10.1016/0167-9317(95)00150-6 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Optics; Physics, Applied SC Engineering; Science & Technology - Other Topics; Optics; Physics GA TP608 UT WOS:A1995TP60800046 ER PT J AU BASTACKY, J LEE, C FREEMAN, T WEBER, G BAEZA, A HUBBINS, T CHEN, Y AF BASTACKY, J LEE, C FREEMAN, T WEBER, G BAEZA, A HUBBINS, T CHEN, Y TI A SPECIMEN HOLDER FOR HIGH-RESOLUTION LOW-TEMPERATURE SCANNING ELECTRON-MICROSCOPY SO MICROSCOPY RESEARCH AND TECHNIQUE LA English DT Note AB A miniature vise built into a 5 mm diameter copper capsule is described that holds small pieces of prefrozen, hydrated specimens at low temperatures within the lens of the Hitachi S900 high-resolution scanning electron microscope. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MECH TECHNOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. GATAN INC,PLEASANTON,CA 94588. UNIV WISCONSIN,MADISON,WI 53706. RP BASTACKY, J (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. FU NCRR NIH HHS [RR00570]; NHLBI NIH HHS [HL52161] NR 8 TC 5 Z9 6 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1059-910X J9 MICROSC RES TECHNIQ JI Microsc. Res. Tech. PD DEC 1 PY 1995 VL 32 IS 5 BP 457 EP 458 DI 10.1002/jemt.1070320509 PG 2 WC Anatomy & Morphology; Biology; Microscopy SC Anatomy & Morphology; Life Sciences & Biomedicine - Other Topics; Microscopy GA TC525 UT WOS:A1995TC52500008 PM 8563045 ER PT J AU Phillips, JM AF Phillips, JM TI MRS prospers under can-do spirit SO MRS BULLETIN LA English DT Editorial Material RP Phillips, JM (reprint author), SANDIA NATL LABS,DEPT SURFACE & MOLEC SPECT 1823,MS 1411,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 0 TC 1 Z9 1 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 DEC PY 1995 VL 20 IS 12 BP 3 EP 3 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA TL870 UT WOS:A1995TL87000001 ER PT J AU Generoso, WM Witt, KL Cain, KT Hughes, L Cacheiro, NLA Lockhart, AMC Shelby, MD AF Generoso, WM Witt, KL Cain, KT Hughes, L Cacheiro, NLA Lockhart, AMC Shelby, MD TI Dominant lethal and heritable translocation tests with chlorambucil and melphalan in male mice SO MUTATION RESEARCH-GENETIC TOXICOLOGY LA English DT Article DE chemotherapeutic agent; chromosome damage; germ cell; sperm; mutagenicity ID MOUSE BONE-MARROW; BREAST-CANCER; MULTIPLE-MYELOMA; CYTOGENETIC ABNORMALITIES; OVARIAN-CARCINOMA; ACUTE-LEUKEMIA; CHEMOTHERAPY; THERAPY; REARRANGEMENTS; MUTATIONS AB Chemicals used in the treatment of cancer include several that are potent mutagens in a range of in vitro and in vivo assays. For some, genetic effects have also been demonstrated in humans, detected as chromosomal aberrations in peripheral lymphocytes. Because (1) many of these agents are confirmed mutagens, (2) humans are exposed to them in relatively high doses, and (3) an increasing number of early cancer victims are surviving to reproductive age, it is important that information be available on the genetic and reproductive hazards associated with exposure to these agents. Chlorambucil and melphalan are structurally related chemicals that are included in our efforts to identify and assess such hazards among cancer chemotherapy agents. To date, both have been reported to induce specific locus mutations in germ cells of male mice (Russell et al., 1989; Russell et al., 1992b) and melphalan is one of very few chemicals shown to induce such mutations in spermatogonial stem cells. More recently, both chemicals were found to have strong reproductive effects in female mice (Bishop and Generoso, 1995, in preparation). In the present studies, these chemicals were tested for the induction of dominant lethal mutations and heritable translocations in male mice. Both chemicals were found to have reproductive effects attributable to cytotoxicity in specific male germ cell stages and to induce dominant lethal mutations and heritable translocations in postmeiotic germ cells, particularly in mid to early stage spermatids. Thus, relatively extensive data are now available for assessing the genetic and reproductive hazards that may result from therapeutic exposures to these chemicals. C1 ORISE, DIV MED SCI, OAK RIDGE, TN 37831 USA. RTP, COMP SCI CORP, OAK RIDGE, NC 27709 USA. NIEHS, RTP, EXPTL TOXIXOL PROGRAM, OAK RIDGE, NC 27709 USA. RP OAK RIDGE NATL LAB, DIV BIOL, POB 2009, OAK RIDGE, TN 37831 USA. NR 53 TC 26 Z9 27 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1218 J9 MUTAT RES-GENET TOX JI Mutat. Res.-Genet. Toxicol. PD DEC PY 1995 VL 345 IS 3-4 BP 167 EP 180 DI 10.1016/0165-1218(95)90052-7 PG 14 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA TR093 UT WOS:A1995TR09300009 PM 8552138 ER PT J AU AVRAHAM, KB HASSON, T STEEL, KP KINGSLEY, DM RUSSELL, LB MOOSEKER, MS COPELAND, NG JENKINS, NA AF AVRAHAM, KB HASSON, T STEEL, KP KINGSLEY, DM RUSSELL, LB MOOSEKER, MS COPELAND, NG JENKINS, NA TI THE MOUSE SNELLS WALTZER DEAFNESS GENE ENCODES AN UNCONVENTIONAL MYOSIN REQUIRED FOR STRUCTURAL INTEGRITY OF INNER-EAR HAIR-CELLS SO NATURE GENETICS LA English DT Article ID SUPERFAMILY; SEQUENCES; HEARING; CLONES; LOCUS AB The mouse represents an excellent model system for the study of genetic deafness in humans. Many mouse deafness mutants have been identified and the anatomy of the mouse and human ear is similar. Here we report the use of a positional cloning approach to identify the gene encoded by the mouse recessive deafness mutation, Snell's waltzer (sv). We show that sv encodes an unconventional myosin heavy chain, myosin VI, which is expressed within the sensory hair cells of the inner ear, and appears to be required for maintaining their structural integrity. The requirement for myosin VI in hearing makes this gene an excellent candidate for a human deafness disorder. C1 YALE UNIV,DEPT CELL BIOL,NEW HAVEN,CT 06511. YALE UNIV,DEPT PATHOL,NEW HAVEN,CT 06511. MRC,INST HEARING RES,NOTTINGHAM NG7 2RD,ENGLAND. STANFORD UNIV,SCH MED,DEPT DEV BIOL,STANFORD,CA 94305. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. YALE UNIV,DEPT BIOL,NEW HAVEN,CT 06511. RP AVRAHAM, KB (reprint author), NCI,FREDERICK CANC RES & DEV CTR,ABL,BASIC RES PROGRAM,MAMMALIAN GENET LAB,FREDERICK,MD 21702, USA. FU NIDDK NIH HHS [DK-25387, DK-38979]; NIGMS NIH HHS [5F32GM15909-02] NR 28 TC 344 Z9 349 U1 0 U2 10 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 DEC PY 1995 VL 11 IS 4 BP 369 EP 375 DI 10.1038/ng1295-369 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA TH629 UT WOS:A1995TH62900012 PM 7493015 ER PT J AU ASHWORTH, LK BATZER, MA BRANDRIFF, B BRANSCOMB, E DEJONG, P GARCIA, E GARNES, JA GORDON, LA LAMERDIN, JE LENNON, G MOHRENWEISER, H OLSEN, AS SLEZAK, T CARRANO, AV AF ASHWORTH, LK BATZER, MA BRANDRIFF, B BRANSCOMB, E DEJONG, P GARCIA, E GARNES, JA GORDON, LA LAMERDIN, JE LENNON, G MOHRENWEISER, H OLSEN, AS SLEZAK, T CARRANO, AV TI AN INTEGRATED METRIC PHYSICAL MAP OF HUMAN-CHROMOSOME-19 SO NATURE GENETICS LA English DT Article ID HUMAN GENOME; HIGH-RESOLUTION; HUMAN DNA; GENE; ORGANIZATION; CLONING; CLONES; LIBRARIES; FRAGMENTS; MARKERS AB A metric physical map of human chromosome 19 has been generated. The foundation of the map is sets of overlapping cosmids (contigs) generated by automated fingerprinting spanning over 95% of the euchromatin, about 50 megabases (Mb). Distances between selected cosmid clones were estimated using fluorescence in situ hybridization in sperm pronuclei, providing both order and distance between contigs. An average inter-marker separation of 230 kb has been obtained across the non-centromeric portion of the chromosome. Various types of larger insert clones were used to span gaps between contigs. Currently, the map consists of 51 'islands' containing multiple clone types, whose size, order and relative distance are known. Over 450 genes, genetic markers, sequence tagged sites (STSs), anonymous cDNAs, and other markers have been localized. In addition, EcoRI restriction maps have been generated for >41 Mb (similar to 83%) of the chromosome. RP ASHWORTH, LK (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,L-452,LIVERMORE,CA 94551, USA. NR 50 TC 172 Z9 172 U1 0 U2 1 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 DEC PY 1995 VL 11 IS 4 BP 422 EP 427 DI 10.1038/ng1295-422 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA TH629 UT WOS:A1995TH62900020 PM 7493023 ER PT J AU MAROTI, P HANSON, DK SCHIFFER, M SEBBAN, P AF MAROTI, P HANSON, DK SCHIFFER, M SEBBAN, P TI LONG-RANGE ELECTROSTATIC INTERACTION IN THE BACTERIAL PHOTOSYNTHETIC REACTION-CENTER SO NATURE STRUCTURAL BIOLOGY LA English DT Letter ID REACTION CENTERS; RHODOBACTER-SPHAEROIDES; PROTON-TRANSFER; BINDING-SITE; SECONDARY QUINONE; ACCEPTOR; PATHWAY; REPLACEMENT; RESIDUES; ASPL213 AB Measurement of proton uptake in the bacterial photosynthetic reaction centre indicates that the formation of Q(A-) has an electrostatic influence on the protonation of residue Glu-L212 some 17 Angstrom distant from Q(A-). C1 ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. ATTILA JOZSEF UNIV,DEPT BIOPHYS,H-6701 SZEGED,HUNGARY. CNRS,CTR GENET MOLEC,F-91198 GIF SUR YVETTE,FRANCE. NR 28 TC 51 Z9 51 U1 1 U2 2 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 1072-8368 J9 NAT STRUCT BIOL JI Nat. Struct. Biol. PD DEC PY 1995 VL 2 IS 12 BP 1057 EP 1059 DI 10.1038/nsb1295-1057 PG 3 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA TH949 UT WOS:A1995TH94900006 PM 8846215 ER PT J AU CHITANVIS, SM HADEMENOS, G POWERS, WJ AF CHITANVIS, SM HADEMENOS, G POWERS, WJ TI HEMODYNAMIC ASSESSMENT OF THE DEVELOPMENT AND RUPTURE OF INTRACRANIAL ANEURYSMS USING COMPUTATIONAL SIMULATIONS SO NEUROLOGICAL RESEARCH LA English DT Article DE INTRACRANIAL ANEURYSM; HEMODYNAMICS; COMPUTATIONAL SIMULATIONS ID SACCULAR ANEURYSMS; CEREBRAL ANEURYSMS; MATHEMATICAL-MODEL; FLOW-ANALYSIS; ORIGIN; MECHANICS; PRESSURE; GROWTH AB Intracranial aneurysms manifest themselves as sacculations within a weakened region of the vessel wall and pose substantial neurological risks upon rupture. A primary factor in the development and rupture stages of an aneurysm is hemodynamics and its degrading effects on the aneurysm wall. Wall dynamics and hemodynamics within a fully developed aneurysm were investigated using computational simulation techniques. To study wall dynamics, the aneurysm was modeled as a thin spherical shell with linearly elastic and plastic (viscoelastic) wall behavior. The sensitivity of this model to the biophysical parameters which describe it will assist in the quantitative assessment of factors predisposing to aneurysm rupture and subarachnoid hemorrhage. Flow dynamics simulations were performed for spherical aneurysms with rigid walls. We observed the development and motion of an annular vortex within the lateral sacculation. We also simulated a ruptured aneurysm by placing a tear near the neck of the aneurysm. Flow patterns showed blood flowing out during the initial stages of the flow but displayed an inflow of blood soon thereafter as the internal pressure dropped. These results are substantiated by the clinical observations that turbulent flow is observed within the aneurysm, as evidenced by reduced bruits. C1 LOS ALAMOS NATL LAB,DIV APPL THEORET,GRP X6,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,SCH MED,DEPT RADIOL SCI,DIV MED IMAGING,LOS ANGELES,CA 90024. RP CHITANVIS, SM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,GRP T12,MAIL STOP B 268,LOS ALAMOS,NM 87545, USA. NR 26 TC 9 Z9 9 U1 0 U2 1 PU FOREFRONT PUBL GROUP PI LONDON PA MONOMARK HOUSE 27 OLD GLOUCESTER STREET, LONDON, ENGLAND WC1N 3XX SN 0161-6412 J9 NEUROL RES JI Neurol. Res. PD DEC PY 1995 VL 17 IS 6 BP 426 EP 434 PG 9 WC Clinical Neurology; Neurosciences SC Neurosciences & Neurology GA TJ818 UT WOS:A1995TJ81800006 PM 8622796 ER PT J AU Bell, MG McGuire, KM Arunasalam, V Barnes, CW Batha, SH Bateman, G Beer, MA Bell, RE Bitter, M Bretz, NL Budny, RV Bush, CE Cauffman, SR Chang, Z Chang, CS Cheng, CZ Darrow, DS Dendy, RO Dorland, W Duong, HH Durst, RD Efthimion, PC Ernst, D Evenson, H Fisch, NJ Fisher, RK Fonck, RJ Fredrickson, ED Fu, GY Furth, HP Gorelenkov, NN Grek, B Grisham, LR Hammett, GW Hanson, GR Hawryluk, RJ Heidbrink, WW Herrmann, HW Hill, KW Hosea, JC Hsuan, H Hughes, MH Hulse, RA Janos, AC Jassby, DL Jobes, FC Johnson, DW Johnson, LC Kesner, J Kugel, HW Lam, NT Leblanc, B Levinton, FM Machuzak, J Majeski, R Mansfield, DK Mazzucato, E Mauel, ME McChesney, JM McCune, DC McKee, G Meade, DM Medley, SS Mikkelsen, DR Mirnov, SV Mueller, D Navratil, GA Nazikian, R Owens, DK Park, HK Park, W Parks, PB Paul, SF Petrov, MP Phillips, CK Phillips, MW Pitcher, CS Ramsey, AT Redi, MH Rewoldt, G Roberts, DR Rogers, JH Ruskov, E Sabbagh, SA Sasao, M Schilling, G Schivell, JF Schmidt, GL Scott, SD Semenov, I Sesnic, S Skinner, CH Stratton, BC Strachan, JD Stodiek, W Synakowski, EJ Takahashi, H Tang, WM Taylor, G Terry, JL Thompson, ME Tighe, W vonGoeler, S White, RB Wieland, RM Wilson, JR Wong, KL Woskov, P Wurden, GA Yamada, M Young, KM Zarnstorff, MC Zweben, SJ AF Bell, MG McGuire, KM Arunasalam, V Barnes, CW Batha, SH Bateman, G Beer, MA Bell, RE Bitter, M Bretz, NL Budny, RV Bush, CE Cauffman, SR Chang, Z Chang, CS Cheng, CZ Darrow, DS Dendy, RO Dorland, W Duong, HH Durst, RD Efthimion, PC Ernst, D Evenson, H Fisch, NJ Fisher, RK Fonck, RJ Fredrickson, ED Fu, GY Furth, HP Gorelenkov, NN Grek, B Grisham, LR Hammett, GW Hanson, GR Hawryluk, RJ Heidbrink, WW Herrmann, HW Hill, KW Hosea, JC Hsuan, H Hughes, MH Hulse, RA Janos, AC Jassby, DL Jobes, FC Johnson, DW Johnson, LC Kesner, J Kugel, HW Lam, NT Leblanc, B Levinton, FM Machuzak, J Majeski, R Mansfield, DK Mazzucato, E Mauel, ME McChesney, JM McCune, DC McKee, G Meade, DM Medley, SS Mikkelsen, DR Mirnov, SV Mueller, D Navratil, GA Nazikian, R Owens, DK Park, HK Park, W Parks, PB Paul, SF Petrov, MP Phillips, CK Phillips, MW Pitcher, CS Ramsey, AT Redi, MH Rewoldt, G Roberts, DR Rogers, JH Ruskov, E Sabbagh, SA Sasao, M Schilling, G Schivell, JF Schmidt, GL Scott, SD Semenov, I Sesnic, S Skinner, CH Stratton, BC Strachan, JD Stodiek, W Synakowski, EJ Takahashi, H Tang, WM Taylor, G Terry, JL Thompson, ME Tighe, W vonGoeler, S White, RB Wieland, RM Wilson, JR Wong, KL Woskov, P Wurden, GA Yamada, M Young, KM Zarnstorff, MC Zweben, SJ TI Overview of DT results from TFTR SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID TOKAMAK; CONFINEMENT AB Experiments with plasmas having nearly equal concentrations of deuterium and tritium have been carried out on TFTR. To date (September 1995), the maximum fusion power has been 10.7 MW, using 39.5 MW of neutral beam heating, in a supershot discharge and 6.7 MW in a high beta(p) discharge following a current ramp-down. The fusion power density in the core of the plasma has reached 2.8 MW/m(3), exceeding that expected in the International Thermonuclear Experimental Reactor (ITER). The energy confinement time tau(E) is observed to increase in DT, relative to D plasmas, by 20% and the n(i)(0). T-i(0).tau(E) product by 55%. The improvement in thermal confinement is caused primarily by a decrease in ion heat conductivity in both supershot and limiter H mode discharges. Extensive lithium pellet injection increased the confinement time to 0.27 s and enabled higher current operation in both supershot and high beta(p) discharges. First measurements of the confined alpha particles have been performed and found to be in good agreement with TRANSP simulations assuming classical confinement. Measurements of the alpha ash profile have been compared with simulations using particle transport coefficients from helium gas puffing experiments. The loss of energetic alpha particles to a detector at the bottom of the vessel is well described by the first-orbit loss mechanism. No loss due to alpha particle driven instabilities has yet been observed. ICRF heating of a DT plasma, using the second harmonic of tritium, has been demonstrated. DT experiments on TFTR will continue both to explore the physics underlying the ITER design and to examine some of the physics issues associated with an advanced tokamak reactor. RP Bell, MG (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Sabbagh, Steven/C-7142-2011; Hammett, Gregory/D-1365-2011; Ernst, Darin/A-1487-2010; Dendy, Richard/A-4533-2009; Dorland, William/B-4403-2009; White, Roscoe/D-1773-2013; Cheng, Chio/K-1005-2014; Yamada, Masaaki/D-7824-2015; Wurden, Glen/A-1921-2017 OI Hammett, Gregory/0000-0003-1495-6647; Ernst, Darin/0000-0002-9577-2809; Dorland, William/0000-0003-2915-724X; White, Roscoe/0000-0002-4239-2685; Yamada, Masaaki/0000-0003-4996-1649; Wurden, Glen/0000-0003-2991-1484 NR 37 TC 21 Z9 21 U1 1 U2 10 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1429 EP 1436 DI 10.1088/0029-5515/35/12/I02 PG 8 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700002 ER PT J AU Petrov, MP Budny, RV Duong, HH Fisher, RK Gorelenkov, NN McChesney, JM Mansfield, DK Medley, SS Parks, PB Redi, MH Roquemore, AL AF Petrov, MP Budny, RV Duong, HH Fisher, RK Gorelenkov, NN McChesney, JM Mansfield, DK Medley, SS Parks, PB Redi, MH Roquemore, AL TI Studies of energetic confined alphas using the pellet charge exchange diagnostic on TFTR SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID INJECTION; TOKAMAK AB Results from recent DT experiments on TFTR to measure the energy distribution and radial density profile of fast confined alphas with the use of Li pellets and neutral particle analysis are presented. When a pellet is injected into the plasma, a toroidally extended ablation cloud is formed. A small fraction of the fusion alphas incident on the cloud is converted to helium neutrals as a result of electron capture processes. The escaping energetic helium neutrals are analysed and detected by the neutral particle analyser. Radially resolved energy spectra of trapped confined alphas in 0.5-2 MeV range and radial alpha density profiles are presented in this paper. The experimental data are compared with modelling results obtained with the TRANSP Monte Carlo code and with a specially developed Fokker-Planck post-processor (FPP) that uses the alpha source distribution produced by TRANSP. Comparison of the experimental data with TRANSP and FPP shows that the alphas in the plasma core of sawtooth free discharges in TFTR are well confined and slow down classically. The energy and radial profiles distributions outside the plasma core show the influence of stochastic ripple losses on alphas. Measurements for sawtoothing plasmas show a significant outward radial transport of trapped alphas. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. TRINITI,TROITSK,RUSSIA. GEN ATOM CO,SAN DIEGO,CA 92138. RP Petrov, MP (reprint author), AF IOFFE PHYS TECH INST,POLITEKHNICHESKAYA 26,ST PETERSBURG 194021,RUSSIA. NR 16 TC 50 Z9 50 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1437 EP 1443 DI 10.1088/0029-5515/35/12/I03 PG 7 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700003 ER PT J AU Zweben, SJ Darrow, DS Herrmann, HW Redi, MH Schivell, JF White, RB AF Zweben, SJ Darrow, DS Herrmann, HW Redi, MH Schivell, JF White, RB TI Measurements of DT alpha particle loss near the outer midplane of TFTR SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID ENERGY AB Measurements of DT alpha particle loss to the outer midplane region of TFTR have been made using a radially movable scintillator detector. The conclusion from this data is that mechanisms determining the DT alpha loss to the outer midplane are not substantially different from those for DD fusion products. Some of these results are compared with a simplified theoretical model for TF ripple induced alpha loss, which is expected to be the dominant classical alpha loss mechanism near the outer midplane. An example is given of plasma driven MHD induced alpha particle loss to the outer midplane, but no sign of any 'collective' alpha instability induced alpha particle loss has yet been observed at this location. RP Zweben, SJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 19 TC 27 Z9 27 U1 0 U2 6 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1445 EP 1455 DI 10.1088/0029-5515/35/12/I04 PG 11 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700004 ER PT J AU Fredrickson, ED Bell, MG Budny, RV Chang, Z Cheng, CZ Fu, GY Mazzucato, E Nazikian, R Janos, AC McGuire, KM Majeski, R Phillips, CK Schilling, G Taylor, G Wilson, JR AF Fredrickson, ED Bell, MG Budny, RV Chang, Z Cheng, CZ Fu, GY Mazzucato, E Nazikian, R Janos, AC McGuire, KM Majeski, R Phillips, CK Schilling, G Taylor, G Wilson, JR TI Observation of new branch of toroidal Alfven eigenmodes in TFTR SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm AB Experimental observations are presented of a new branch of the toroidal Alfven eigenmode spectrum during ICRF heating of plasmas on TFTR. The identification of the second branch is based largely on direct measurements of the toroidal mode numbers of the toroidal Alfven eigenmodes and by the differences in the time evolution of the frequency spectrum between the new branch and the original toroidal Alfven eigenmodes. The new branch has so far only been observed in relatively low edge q (= 4-4.5) plasmas. RP Fredrickson, ED (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 7 TC 21 Z9 21 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1457 EP 1461 DI 10.1088/0029-5515/35/12/I05 PG 5 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700005 ER PT J AU Batha, SH Levinton, FM Spong, DA Budny, RV Chang, Z Darrow, DS Fredrickson, ED Fu, GY Mazzucato, E Nazikian, R Zweben, SJ AF Batha, SH Levinton, FM Spong, DA Budny, RV Chang, Z Darrow, DS Fredrickson, ED Fu, GY Mazzucato, E Nazikian, R Zweben, SJ TI Experimental study of toroidicity induced Alfven eigenmode (TAE) stability at high q(0) SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID TFTR AB Experiments to destabilize the toroidicity induced Alfven eigenmode (TAE) by energetic alpha particles were performed on the Tokamak Fusion Test Reactor using deuterium and tritium fuel. To decrease the alpha particle pressure instability threshold, discharges with an elevated value of q(0) > 1.5 were used. By raising q(0), the radial location of the low toroidal mode number TAE gaps moves towards the magnetic axis and into alignment with the region of maximum alpha pressure gradient, thereby (in theory) lowering the value of the central alpha particle beta(alpha) required for instability. No TAE activity was observed when beta(alpha)(0) reached 0.08% in a discharge with fusion power of 2.4 MW. Calculations predict that the alpha driven TAE was weakly unstable. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP Batha, SH (reprint author), FUS PHYS & TECHNOL,TORRANCE,CA, USA. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 25 TC 15 Z9 15 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1463 EP 1468 DI 10.1088/0029-5515/35/12/I06 PG 6 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700006 ER PT J AU Chang, Z Fredrickson, ED Zweben, SJ Park, HK Nazikian, R Mazzucato, E Batha, SH Bell, MG Budny, RV Bush, CE Darrow, DS Ernst, D Fu, GY Hawryluk, RJ Hill, KW Hosea, JC Janos, AC Jassby, DL Johnson, DW Johnson, LC Levinton, FM Mansfield, DK McGuire, KM Mikkelsen, DR Mueller, D Owens, DK Ramsey, AT Sabbagh, SA Synakowski, EJ Takahashi, H Taylor, G Thompson, ME Wieland, RM Wong, KL Zarnstorff, MC AF Chang, Z Fredrickson, ED Zweben, SJ Park, HK Nazikian, R Mazzucato, E Batha, SH Bell, MG Budny, RV Bush, CE Darrow, DS Ernst, D Fu, GY Hawryluk, RJ Hill, KW Hosea, JC Janos, AC Jassby, DL Johnson, DW Johnson, LC Levinton, FM Mansfield, DK McGuire, KM Mikkelsen, DR Mueller, D Owens, DK Ramsey, AT Sabbagh, SA Synakowski, EJ Takahashi, H Taylor, G Thompson, ME Wieland, RM Wong, KL Zarnstorff, MC TI Alfven frequency modes at the edge of TFTR plasmas SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID ABEL-INVERSION METHOD; FUSION TEST REACTOR AB An Alfven frequency mode (AFM) is very often seen in TFTR neutral beam heated plasmas as well as in ohmic plasmas. This quasi-coherent mode has so far only been seen on magnetic fluctuation diagnostics (Mirnov coils). A close correlation between the plasma edge density and the mode activity (frequency and amplitude) has been observed, which indicates that the AFM is an edge localized mode with r/a > 0.85. No direct impact of this mode on the plasma global performance or on fast ion loss (e.g., the alpha particles in DT experiments) has been observed. This mode is not the conventional TAE (toroidicity induced Alfven eigenmode). The present TAE theory cannot explain this observation. Other possible explanations are discussed. C1 FUS PHYS & TECHNOL,TORRANCE,CA. COLUMBIA UNIV,NEW YORK,NY 10027. MIT,CAMBRIDGE,MA 02139. RP Chang, Z (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Sabbagh, Steven/C-7142-2011; Ernst, Darin/A-1487-2010 OI Ernst, Darin/0000-0002-9577-2809 NR 21 TC 26 Z9 26 U1 0 U2 3 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1469 EP 1479 DI 10.1088/0029-5515/35/12/I07 PG 11 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700007 ER PT J AU Heidbrink, WW Carolipio, EM James, RA Strait, EJ AF Heidbrink, WW Carolipio, EM James, RA Strait, EJ TI Summary of recent studies of beam-driven BAE and chirping modes in DII-D SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID D TOKAMAK; INSTABILITIES AB In high beta. DIII-D plasmas with intense neutral beam injection, beta induced Alfven eigenmodes (BAE modes) are observed. These instabilities cause concentrated losses of >50% of the fast ions and thus are of concern for future devices. The authors have now observed BAE modes and resultant fast ion loss in full field (2.0 T) discharges where the ratio of parallel velocity to Alfven speed is upsilon(parallel to)/upsilon(A) similar or equal to 0.3. In a few discharges, they have also observed a new instability, a 'chirping' mode. These modes have frequencies between 50 and 200 kHz that 'whistle' down a factor of two in a single 2 ms burst. They occur in plasmas with relatively large values of fast ion beta ((beta(f)) greater than or similar to 1%), Alfven speed (upsilon(parallel to)/upsilon(A) less than or similar to 0.5) and plasma rotation (f(rot) > 20 kHz). In contrast to the usual Alfven modes, which are fluid modes of the background plasma, the chirping instabilities seem to be beam modes that are nearly stationary in the plasma frame. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. GEN ATOM CO, SAN DIEGO, CA USA. RP Heidbrink, WW (reprint author), UNIV CALIF IRVINE, IRVINE, CA 92717 USA. NR 11 TC 11 Z9 11 U1 1 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1481 EP 1483 DI 10.1088/0029-5515/35/12/I08 PG 3 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700008 ER PT J AU Budny, RV Bell, MG Janos, AC Jassby, DL Johnson, LC Mansfield, DK McCune, DC Redi, MH Schivell, JF Taylor, G Terpstra, TB Zarnstorff, MC Zweben, SJ AF Budny, RV Bell, MG Janos, AC Jassby, DL Johnson, LC Mansfield, DK McCune, DC Redi, MH Schivell, JF Taylor, G Terpstra, TB Zarnstorff, MC Zweben, SJ TI Simulations of alpha parameters in a TFTR DT supershot with high fusion power SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID INJECTION; TOKAMAKS AB A TFTR supershot with a plasma current of 2.5 MA, a neutral beam heating power of 33.7 MW and a peak DT fusion power of 7.5 MW is studied using the TRANSP plasma analysis code. Simulations of alpha parameters such as the alpha heating, pressure and distributions in energy and upsilon(parallel to)/upsilon are given. The effects of toroidal ripple and mixing of the fast alpha particles during the sawteeth observed after the neutral beam injection phase are modelled. The distributions of alpha particles on the outer midplane are peaked near forward and backward upsilon(parallel to)/upsilon. Ripple losses deplete the distributions in the vicinity of upsilon(parallel to)/upsilon approximate to -0.2. Sawtooth mixing of fast alpha particles is computed to reduce their central density and broaden their width in energy. RP Budny, RV (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 26 TC 87 Z9 88 U1 0 U2 4 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1497 EP 1508 DI 10.1088/0029-5515/35/12/I10 PG 12 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700010 ER PT J AU Redi, MH Budny, RV Darrow, DS Duong, HH Fisher, RK Janos, AC McChesney, JM McCune, DC Medley, SS Petrov, MP Schivell, JF Scott, SD White, RB Zarnstorff, MC Zweben, SJ AF Redi, MH Budny, RV Darrow, DS Duong, HH Fisher, RK Janos, AC McChesney, JM McCune, DC Medley, SS Petrov, MP Schivell, JF Scott, SD White, RB Zarnstorff, MC Zweben, SJ TI Modelling TF ripple loss of alpha particles in TFTR DT experiments SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID INJECTION; TOKAMAKS AB Modelling of TF ripple loss Of alphas in DT experiments on TFTR now includes neoclassical calculations of first orbit loss, Stochastic ripple diffusion, ripple trapping and collisional effects. A rapid way to simulate experiment has been developed which uses a simple stochastic domain model for TF ripple loss within the TRANSP analysis code, with the ripple diffusion threshold evaluated by comparison with more accurate but computationally expensive Hamiltonian co-ordinate guiding centre code simulations. Typical TF collisional ripple loss predictions are 6-10% loss of alphas for TFTR DT experiments at I-p = 1.0-2.0 MA and R = 2.52 m. C1 GEN ATOM CO,SAN DIEGO,CA. AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA. RP Redi, MH (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 22 TC 36 Z9 36 U1 1 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1509 EP 1516 DI 10.1088/0029-5515/35/12/I11 PG 8 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700011 ER PT J AU Ruskov, E Heidbrink, WW Budny, RV McCune, DC AF Ruskov, E Heidbrink, WW Budny, RV McCune, DC TI Diffusive modelling of enhanced beam ion transport in TFTR plasmas heated with deuterium and tritium beams SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID TOKAMAK; CONFINEMENT AB A search is made for signs of enhanced beam ion transport in a set of TFTR plasmas heated with various numbers of tritium and deuterium beams. Our investigation is based on the time dependent, 1 1/2-D simulation code TRANSP, and an ad hoc diffusion model of enhanced fast ion transport. Spatially constant and spatially variable diffusion models are used (the code was upgraded to allow for D-f(r) modelling). Simulations with spatially constant diffusion coefficients resulted in an upper bound of D-f less than or equal to 0.2 m(2)/s for a set of high power DT supershots. One discharge is analysed in particular detail, in term of both various diffusion models and the effects of systematic errors. Best agreement between the measured neutron fluw in this discharge and the corresponding TRANSP predictions is obtained by assuming that Dt has low values in the inner half of the plasma column (D-f less than or equal to 0.1 m(2)/S) and then rises rapidly in the outer half, suggesting that stochastic ripple diffusion is the likely mechanism for the enhanced beam ion transport. This hypothesis is supported by the modelling results from two other plasmas with large major radii. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP Ruskov, E (reprint author), UNIV CALIF IRVINE,IRVINE,CA 92717, USA. NR 22 TC 3 Z9 3 U1 0 U2 4 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1517 EP 1522 DI 10.1088/0029-5515/35/12/I12 PG 6 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700012 ER PT J AU Goloborodko, VY Reznik, SN Yavorskij, VA Zweben, SJ AF Goloborodko, VY Reznik, SN Yavorskij, VA Zweben, SJ TI Fokker-Planck 3-D modelling of axisymmetric collisional losses of fusion products in TFTR SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID TOKAMAK AB The results of a 3-D (in constants of motion space) Fokker-Planck simulation of the collisional losses of fusion products in axisymmetric DT and DD discharges in TFTR are presented. The distributions of escaped ions over poloidal angle and pitch angle, and their energy spectra, are obtained. Axisymmetric collisional losses of fusion products are found to be less than 2 to 5%. The distribution of confined fusion products is shown to be strongly anisotropic and non-uniform in the radial co-ordinate, mainly for slowed-down fusion products with small longitudinal energy. A comparison between these modelling results and experimental data is made. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP Goloborodko, VY (reprint author), NATL ACAD SCI UKRAINE,INST NUCL RES,KIEV,UKRAINE. NR 22 TC 18 Z9 18 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1523 EP 1535 DI 10.1088/0029-5515/35/12/I13 PG 13 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700013 ER PT J AU Cauffman, S Majeski, R McClements, KG Dendy, RO AF Cauffman, S Majeski, R McClements, KG Dendy, RO TI Alfvenic behaviour of alpha particle driven ion cyclotron emission in TFTR SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm AB Ion cyclotron emission (ICE) has been observed during D-T discharges in the Tokamak Fusion Test Reactor (TFTR), using RF probes located near the top and the bottom of the vacuum vessel. Harmonics of the alpha cyclotron frequency (Omega(alpha)) evaluated at the outer midplane plasma edge are observed at the onset of the beam injection phase of TFTR supershots and persist for approximately 100-250 ms. These results are in contrast with observations of ICE in JET, in which harmonics of Omega(alpha) evolve with the alpha population in the plasma edge. Such differences are believed to be due to the fact that newly born fusion alpha particles are super-Alfvenic near the edge of JET plasmas, while they are sub-Alfvenic near the edge of TFTR supershot plasmas. In TFTR discharges with edge densities such that newly born alpha particles are super-Alfvenic, alpha cyclotron harmonics are observed to persist. These results are in qualitative agreement with numerical calculations of growth rates due to the magnetoacoustic cyclotron instability. C1 UKAEA EURATOM FUS ASSOC,GOVT DIV,ABINGDON,OXON,ENGLAND. RP Cauffman, S (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Dendy, Richard/A-4533-2009 NR 11 TC 46 Z9 47 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1597 EP 1602 DI 10.1088/0029-5515/35/12/I22 PG 6 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700022 ER PT J AU Cheng, CZ Gorelenkov, NN Hsu, CT AF Cheng, CZ Gorelenkov, NN Hsu, CT TI Fast particle destabilization of toroidal Alfven eigenmodes SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID COLLISIONLESS BALLOONING MODES; DIII-D TOKAMAK; ENERGETIC PARTICLES; KINETIC-THEORY; PLASMAS; INSTABILITIES; EXCITATION; STABILITY AB High-n toroidal Alfven eigenmodes (TAEs) are studied on the basis of a kinetic model that includes full thermal ion finite Larmor radius effects, trapped electron collisions and fast particle instability drive. Lower kinetic TAEs (KTAEs) are shown to be non-existent in the nearly collisionless limit. Like TAEs, upper KTAEs are shown to exist because of thermal ion finite Larmor radius effects in the dissipationless limit. Dissipation effects on the stability of both TAEs and upper KTAEs can be treated perturbatively. However, owing to their extended mode structure in the ballooning space, upper KTAEs usually remain stable or weakly unstable even with large fast particle free energy. On the other hand, TAEs can be strongly destabilized. A new resonant TAE (RTAE) can be excited when the fast particle drive is significantly large. The RTAE is a beam-like mode, with its frequency determined mainly by the wave-particle resonance condition. The frequency of the RTAE can be much less than the TAE gap frequency and may be interpreted as the BAE observed in DIII-D experiments. As plasma beta increases, the TAE, RTAE and kinetic ballooning modes strongly couple; the TAE changes into the RTAE and eventually connects to the kinetic ballooning mode. Numerical results and analytical analysis on the stability of the RTAEs and KTAEs will be presented and compared with the TAE stability. C1 TROITSK INST INNOVAT & FUS RES,TROITSK,RUSSIA. RP Cheng, CZ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 23 TC 73 Z9 73 U1 2 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1639 EP 1650 DI 10.1088/0029-5515/35/12/I28 PG 12 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700028 ER PT J AU Spong, DA Hedrick, CL Carreras, BA AF Spong, DA Hedrick, CL Carreras, BA TI Strategies for modifying alpha driven TAE thresholds through q profile and ion temperature control SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID TOROIDAL ALFVEN EIGENMODES; TOKAMAKS; EXCITATION; STABILITY; PLASMAS; MODES; WAVES; TFTR AB Two methods are examined for influencing the stability thresholds of alpha driven toroidal Alfven eigenmode (TAE) instabilities in the deuterium-tritium (DT) operation of the Tokamak Fusion Test Reactor (TFTR). These are: (a) increasing the TAE drive through raising the central q(0) value (in order to centre the peak alpha pressure gradient on the lower m gap locations) and (b) decreasing the TAE damping rate on the background ions through cooling perturbations such as helium puffs or injected pellets. A gyrofluid model of the TAE is used that is inherently non-perturbative and includes continuum damping, ion/electron/neutral beam Landau damping, ion FLR effects and a generalized resistivity (finite E(1) effects). Specific TFTR DT cases are analysed using a combination of measured and inferred profiles. The resulting predicted thresholds are generally consistent with an observed lack of strong TAE activity. However, it is found that special techniques, especially increasing q(0), can significantly lower the alpha driven TAE threshold into ranges that should be experimentally accessible. RP Spong, DA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 37 TC 22 Z9 22 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1687 EP 1696 DI 10.1088/0029-5515/35/12/I33 PG 10 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700033 ER PT J AU White, RB Wu, Y Chen, Y Fredrickson, ED Darrow, DS Zarnstorff, MC Wilson, JR Zweben, SJ Hill, KW Fu, GY Rosenbluth, MN AF White, RB Wu, Y Chen, Y Fredrickson, ED Darrow, DS Zarnstorff, MC Wilson, JR Zweben, SJ Hill, KW Fu, GY Rosenbluth, MN TI Non-linear analysis of the toroidicity induced Alfven eigenmode SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID ENERGETIC INJECTED BEAM; SINGLE-MODE DRIVEN; TOROIDAL PLASMAS; WAVE PROBLEM; SATURATION; EXCITATION; SIMULATION; STABILITY; TFTR AB A fast and efficient numerical algorithm using energy conservation is developed to study the interaction of high energy particles with a toroidicity induced Alfven eigenmode (TAE). A Hamiltonian guiding centre code is used to simulate the alpha particle motion and a non-linear delta f scheme is employed to calculate the wave-particle energy exchange. For a single TAE mode, the particle radial excursion is much less than the spacing between the resonances produced by the poloidal harmonics for International Thermonuclear Experimental Reactor parameters. Modification of the particle distribution leading to mode saturation is observed. A TAE is found in some cases to cause loss through induced ripple trapping. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,SAN DIEGO,CA 92103. RP White, RB (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 30 TC 14 Z9 14 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1707 EP 1712 DI 10.1088/0029-5515/35/12/I35 PG 6 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700035 ER PT J AU Dendy, RO McClements, KG LashmoreDavies, CN Cottrell, GA Majeski, R Cauffman, S AF Dendy, RO McClements, KG LashmoreDavies, CN Cottrell, GA Majeski, R Cauffman, S TI Ion cyclotron emission due to collective instability of fusion products and beam ions in TFTR and JET SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID RADIATION AB Ion cyclotron emission (ICE) has been observed from neutral beam heated TFTR and JET tritium experiments at sequential cyclotron harmonics of both fusion products and beam ions. The emission originates from the outer midplane plasma, where fusion products and beam ions are likely to have a drifting ring-type velocity-space distribution that is anisotropic and sharply pecked. Fusion product driven ICE in both TFTR and JET can be attributed to the magnetoacoustic cyclotron instability, which involves the excitation of obliquely propagating waves on the fast Alfven/ion Bernstein branch at cyclotron harmonics of the fusion products. Differences between ICE observations in JET and TFTR appear to reflect the sensitivity of the instability growth rate to the ratio upsilon(birth)/c(A); where upsilon(birth) is the fusion product birth speed and C-A is the local Alfven speed: for fusion products in the outer midplane edge of TFTR supershots, upsilon(birth) < c(A); for alpha particles in the outer midplane edge of JET, the opposite inequality applies. If sub-alfvenic fusion products are isotropic or have undergone even a moderate degree of thermalization, the magnetoacoustic instability cannot occur. In contrast, the super-Alfvenic alpha particles that are present in the outer midplane of JET can drive the magnetoacoustic cyclotron instability even if they are isotropic or have a relatively broad distribution of speeds. These conclusions may account for the observation that fusion product driven ICE in JET persists for longer than fusion product driven ICE in TFTR. Moreover, the time evolution of the maximum growth rate, obtained using the Sigmar model for the alpha particle distribution and TFTR data for the fusion product source rate, closely follows the observed time evolution of the ICE amplitude in TFTR supershot discharges. Other observed features of fusion product driven ICE that match the linear instability include the scaling with fusion product density, doublet splitting of spectral peaks, the relative strength of certain harmonics and source localization. A separate mechanism is proposed for the excitation of beam driven ICE in TFTR: electrostatic ion cyclotron harmonic waves, supported by strongly sub-Alfvenic beam ions, can be destabilized by a low concentration of such ions with a very narrow spread of velocities in the parallel direction. Sufficiently narrow distributions are Likely to exist in the edge plasma, close to the point of beam injection. C1 JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP Dendy, RO (reprint author), UKAEA EURATOM FUS ASSOC,GOVT DIV,ABINGDON,OXON,ENGLAND. RI Dendy, Richard/A-4533-2009 NR 26 TC 28 Z9 28 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1733 EP 1742 DI 10.1088/0029-5515/35/12/I38 PG 10 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700038 ER PT J AU Gorelenkov, NN Cheng, CZ AF Gorelenkov, NN Cheng, CZ TI Alfven cyclotron instability and ion cyclotron emission SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID DEUTERIUM-TRITIUM EXPERIMENTS; RADIATION; PRODUCTS; JET AB Two-dimensional solutions of compressional Alfven eigenmodes (CAEs) are studied in the cold plasma approximation. For finite inverse aspect ratio tokamak plasmas the two-dimensional eigenmode envelope is localized at the low magnetic field side with the radial and poloidal localization on the order of a/root m and a/(4) root m, respectively, where m is the dominant poloidal mode number. Charged fusion product driven Alfven cyclotron instability (ACI) of the compressional Alfven eigenmodes provides the explanation for the ion cyclotron emission (ICE) spectrum observed in tokamak experiments. The ACI is excited by fast charged fusion products via Doppler shifted cyclotron wave-particle resonances. The ion cyclotron and electron Landau dampings and fast particle instability drive are calculated perturbatively for deuterium-deuterium (DD) and deuterium-tritium (DT) plasmas. Near the plasma edge at the low field side the velocity distribution function of charged fusion products is localized in both pitch angle and velocity. The poloidal localization of the eigenmode enhances the ACI growth rates by a factor of root m in comparison with the previous results without poloidal envelope. The thermal ion cyclotron damping determines that only modes with eigenfrequencies at multiples of the edge cyclotron frequency of the background ions can be easily excited and form an ICE spectrum similar to the experimental observations. Theoretical understanding is given for the results of TFTR DD and DT experiments with upsilon(alpha 0)/upsilon(A) similar or equal to 1 and JET experiments with upsilon(alpha 0)/upsilon(A) > 1. C1 TROITSK INNOVAT & FUS RES INST,TROITSK,RUSSIA. RP Gorelenkov, NN (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 15 TC 55 Z9 55 U1 0 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1743 EP 1752 DI 10.1088/0029-5515/35/12/I39 PG 10 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700039 ER PT J AU Fisch, NJ Herrmann, MC AF Fisch, NJ Herrmann, MC TI Alpha power channelling with two waves SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID INDUCED ALFVEN EIGENMODES; PARTICLE LOSSES; TOKAMAK; TOPOLOGY; PLASMAS; DRIVEN; ORBITS AB The complete channelling of energy from alpha particles is likely to be realized only through the excitation of a variety of waves, rather than by one wave alone. While one wave constrains more firmly the direction of the energy transfer, the necessary wave characteristics are far more easily achieved through a combination of waves, even at the expense of less restrictive motion of the alpha particles. RP Fisch, NJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 27 TC 42 Z9 42 U1 1 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1995 VL 35 IS 12 BP 1753 EP 1760 DI 10.1088/0029-5515/35/12/I40 PG 8 WC Physics, Fluids & Plasmas SC Physics GA TU607 UT WOS:A1995TU60700040 ER PT J AU Chen, KR AF Chen, KR TI Gyrobroadening of fast ion energy spectrum due to relativistic mass variation SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 4th IAEA Technical Committee Meeting CY APR 25-28, 1995 CL PRINCETON, NJ SP IAEA Tech Comm ID INSTABILITIES; PLASMAS; MECHANISM AB A gyrobroadening process causing the perpendicular energy of fast ions to be broadened by cyclotron instabilities due to the relativistic mass variation of the fast ions in a magnetized plasma is reported. At low cyclotron harmonics, a two-gyro-stream instability can be excited with the involvement of thermal ions if the condition l(f) omega(cf) < omega alpha and alpha --> beta transitions were found to be similar to 11 and 21 at.% Fe respectively. C1 UNIV FED RIO GRANDE SUL,INST FIS,BR-91501970 PORTO ALEGRE,RS,BRAZIL. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Maltez, Rogerio/K-1173-2016 OI Maltez, Rogerio/0000-0002-8653-6118 NR 10 TC 6 Z9 6 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 DEC PY 1995 VL 106 IS 1-4 BP 400 EP 403 DI 10.1016/0168-583X(95)00739-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100073 ER PT J AU Walter, KC Dodd, RA Conrad, JR AF Walter, KC Dodd, RA Conrad, JR TI Corrosion behavior of nitrogen implanted aluminum SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV ID SOURCE ION-IMPLANTATION; SURFACE MODIFICATION; BEAM; LAYERS AB Pure (99.999%) aluminum has been implanted with nitrogen using a plasma source ion implantation process. A glow discharge plasma and a 50 kV bias were used to achieve a retained dose of similar to 10(18) N-at/cm(2). Some samples were Ar sputter-cleaned prior to nitrogen implantation. Auger depth profiling and TEM analysis indicated a stoichiometric AIN layer about 150 nm thick formed on the surface as a result of the nitrogen implantation process. Potentiodynamic corrosion tests performed in 3.5 wt% NaCl solution (seawater) indicated that nitrogen implantation gave pure aluminum improved corrosion resistance. Without argon sputter-cleaning, nitrogen implanted samples exhibited insulating behavior to the extent of completely suppressing the corrosion current. Sputter-cleaned and nitrogen implanted samples did not exhibit the insulating behavior, but still provided a reduction in the corrosion current and a more noble corrosion potential. This work shows that a significant modification of the corrosion resistance of pure aluminum can be accomplished using a nitrogen plasma source ion implantation process. C1 UNIV WISCONSIN,MADISON,WI 53706. RP Walter, KC (reprint author), LOS ALAMOS NATL LAB,MS-K762,LOS ALAMOS,NM 87545, USA. NR 17 TC 42 Z9 43 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 DEC PY 1995 VL 106 IS 1-4 BP 522 EP 526 DI 10.1016/0168-583X(95)00763-6 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100096 ER PT J AU Sharkeev, YP Girsova, NV Ryabchikov, AI Kozlov, EV Perevalova, OB Brown, IG Yao, XY AF Sharkeev, YP Girsova, NV Ryabchikov, AI Kozlov, EV Perevalova, OB Brown, IG Yao, XY TI Dislocation structure in coarse-grained copper after ion implantation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV AB We have investigated the dislocation structures formed in the near surface region of ion implanted coarse-grained copper (grain size 460 mu m) using transmission electron microscopy. Ti and Zr ions were implanted into copper using a vacuum are ion source. The ion energy was about 100 keV and the applied (incident) dose was 1 x 10(17) cm(-2). We find that Ti and Zr ion implantations produce a developed dislocation structure in the Cu subsurface layers. The dislocation structure changes form cell-net and cell dislocation structures at shallow depth to individual randomly distributed dislocations at greater depth. The maximum dislocation density in copper is 6.1 x 10(9) cm(-2) for Ti and 11.4 x 10(9) cm(-2) for Zr. The thickness of the modified copper layer with high dislocation density is up to 20 mu m for Ti and 50 mu m for Zr. Microhardness measurements vs. depth and dopant concentration profiles are presented. The long range effect is explained in terms of a model of static and dynamic mechanical stresses formed in the implanted surface layer. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RUSSIAN ACAD SCI,INST STRENGTH PHYS & MAT SCI,TOMSK 634048,RUSSIA. INST NUCL PHYS,TOMSK 634050,RUSSIA. TOMSK STATE ACAD ARCHITECTURE & BLDG,TOMSK 635003,RUSSIA. RI Ryabchikov, Alexander/A-3180-2014; OI Alexander, Ryabchikov/0000-0001-6701-7358 NR 11 TC 14 Z9 14 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1995 VL 106 IS 1-4 BP 532 EP 537 DI 10.1016/0168-583X(96)80034-6 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100098 ER PT J AU Zimmerman, RL Ila, D Jenkins, GM Maleki, H Poker, DB AF Zimmerman, RL Ila, D Jenkins, GM Maleki, H Poker, DB TI Ion beam promoted lithium absorption in glassy polymeric carbon SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV AB Glassy Polymeric Carbon (GPC) samples prepared from a precursor possess accessible pore volume that depends on the heat treatment temperature [G.M. Jenkins and K. Kawamura, Polymeric Carbons - Carbon Fiber, Glass and Char (Cambridge University Press, Cambridge, 1976) p. 140]. We have shown that lithium percolates without diffusion into the accessible pores of GPC samples immersed in a molten lithium salt bath at 700 degrees C [D. Ila, G.M. Jenkins, L.R. Holland, A.L. Evelyn and H. Jena, Vacuum 45 (1994) 451]. Ion bombardment with 10 MeV Au atoms increases the total pore volume available for lithium occupation even for samples normally impermeable to lithium. The lithium concentration depth profile is measured using Li-7(p,2 alpha) nuclear reaction analysis. We will report on lithium percolation into GPC prepared at temperatures between 500 degrees C and 1000 degrees C and activated by a 10 MeV gold ion bombardment. C1 ALABAMA A&M UNIV,CTR IRRADIAT MAT,NORMAL,AL 35762. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. NR 8 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 DEC PY 1995 VL 106 IS 1-4 BP 550 EP 554 DI 10.1016/0168-583X(95)00768-7 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100101 ER PT J AU Sickafus, KE Yu, N Devanathan, R Nastasi, M AF Sickafus, KE Yu, N Devanathan, R Nastasi, M TI The irradiation damage response of MgO center dot 3Al(2)O(3) spinel single crystal under high-fluence ion-irradiation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV ID CERAMICS AB Non-stoichiometric single crystal spinel samples with composition MgO . 3Al(2)O(3) were irradiated near (001) orientation with 400 keV Xe++ ions at 100 K to a dose of 1 x 10(16) Xe/cm(2), representing a peak damage level of 25 displacements per atom (dpa). Damage accumulation in the irradiated surface was assessed by cross-sectional transmission electron microscopy. A continuous crystalline layer was observed in the implanted region. The layer is oriented with the underlying substrate, but is highly defected and possesses a symmetry different than that of the bulk. This change in symmetry is revealed by the absence of diffracted intensity at first-order spinel reciprocal lattice positions. These results are compared with earlier observations on equimolar (001) MgO . Al2O3 single crystals irradiated with 400 keV Xe++ ions to the same dose and at the same temperature [N. Yu, K.E. Sickafus and M. Nastasi, Phil. Mag. Lett. 70(4) (1994) 235 (Ref. [1])]. RP Sickafus, KE (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. RI Devanathan, Ram/C-7247-2008 OI Devanathan, Ram/0000-0001-8125-4237 NR 8 TC 17 Z9 17 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 DEC PY 1995 VL 106 IS 1-4 BP 573 EP 578 DI 10.1016/0168-583X(95)00772-5 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100105 ER PT J AU Yu, N Nastasi, M AF Yu, N Nastasi, M TI Ion beam induced epitaxial recrystallization of alumina thin films deposited on sapphire SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV ID SILICON AB We have investigated ion beam induced epitaxial recrystallization (IBIER) of amorphous alumina thin films deposited on c-axis single crystal sapphire substrates. The alumina thin films, deposited by electron-beam evaporation, were about 66 and 90 nm thick, and doped with Fe cations to cation concentrations of 0 and 2 at.%, respectively. The as-deposited samples were subsequently irradiated at temperatures of 400, 500, and 600 degrees C with either 180 keV oxygen ions or 360 keV argon ions. The process of IBIER was characterised with Rutherford backscattering spectrometry combined with ion channeling techniques. A kinetics study showed that the process of IBIER in alumina is characterised by an effective activation energy of 0.23 +/- 0.05 eV. This value is one order of magnitude lower than that (5.0 eV) determined from the thermal annealing studies for the phase transformation of gamma-to-alpha. Our preliminary study also revealed that the presence of Fe cations in the films inhibits the IBIER process. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 14 TC 8 Z9 8 U1 1 U2 13 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 DEC PY 1995 VL 106 IS 1-4 BP 579 EP 582 DI 10.1016/0168-583X(95)00773-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100106 ER PT J AU Donnelly, SE Birtcher, RC Templier, C AF Donnelly, SE Birtcher, RC Templier, C TI The effect of dense and dilute collision cascades on helium bubbles in metals SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV AB The evolution of small helium bubbles in thin gold and aluminum foils has been followed during irradiation with high energy heavy ions (400 keV Ar+ and 200 keV Xe+) using in-situ transmission electron microscopy. Substrate materials were chosen in order that the heavy ion irradiation would produce dilute (aluminum) and dense (gold) collision cascades. Significant differences in bubble behaviour are observed in the two cases, the major effect of dilute cascades being bubble shrinkage due to helium resolution by direct displacement of the gas out of the bubbles. Effects observed for dense cascades, however, include the disappearance and Brownian motion of bubbles under irradiation. The paper will present recent experimental results as well as simple numerical modelling of the observed behaviour. In particular, our interpretation of the dense cascade effects is consistent with the type of displacement and thermal spike processes that recent molecular dynamics simulations have indicated may be important in radiation damage in metals. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. FAC SCI POITIERS,MET PHYS LAB,F-86022 POITIERS,FRANCE. RP Donnelly, SE (reprint author), UNIV SALFORD,SCI RES INST,JOULE LAB,SALFORD M5 4WT,LANCS,ENGLAND. OI Donnelly, Stephen/0000-0002-9749-5550 NR 12 TC 3 Z9 4 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 DEC PY 1995 VL 106 IS 1-4 BP 583 EP 588 DI 10.1016/0168-583X(95)00774-1 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100107 ER PT J AU Levine, TE Yu, N Kodali, P Walter, KC Nastasi, M Tesmer, JR Maggiore, CJ Mayer, JW AF Levine, TE Yu, N Kodali, P Walter, KC Nastasi, M Tesmer, JR Maggiore, CJ Mayer, JW TI In situ ion-beam analysis and modification of sol-gel zirconia thin films SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV ID DENSIFICATION AB We report the investigation of ion-beam-induced densification of sol-gel zirconia thin films via in situ ion backscattering spectrometry. We have irradiated three regions of a sample with neon, argon, and krypton ions. For each ion species, a series of irradiation and analysis steps were performed using an interconnected 3 MV tandem accelerator. The technique offers the advantages of minimising the variation of experimental parameters and sequentially monitoring the densification phenomenon with increasing ion dose. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. ARIZONA STATE UNIV,DEPT CHEM BIO & MAT ENGN,TEMPE,AZ 85287. RP Levine, TE (reprint author), CORNELL UNIV,DEPT MAT SCI & ENGN,ITHACA,NY 14853, USA. NR 14 TC 6 Z9 6 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 DEC PY 1995 VL 106 IS 1-4 BP 597 EP 601 DI 10.1016/0168-583X(95)00816-0 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100109 ER PT J AU Horn, KM Doyle, B Segal, MN Hamm, RW Adler, RJ Galtstein, E AF Horn, KM Doyle, B Segal, MN Hamm, RW Adler, RJ Galtstein, E TI The use of low energy, ion induced nuclear reactions for proton radiotherapy applications SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV ID STAINLESS-STEEL; CROSS-SECTION; EXPERIENCE; HELIUM; HEAD; RFQ AB Medical radiotherapy has traditionally relied upon the use of external photon beams and internally implanted radioisotopes as the chief means of irradiating tumors. However, advances in accelerator technology and the exploitation of novel means of producing radiation may provide useful alternatives to some current modes of medical radiation delivery - with reduced total dose to surrounding healthy tissue, reduced expense, or increased treatment accessibility. This paper will briefly overview currently established modes of radiation therapy, techniques still considered experimental but in clinical use and innovative concepts under study that may enable new forms of treatment or enhance existing ones. The potential role of low energy, ion-induced nuclear reactions in radiotherapy applications is examined specifically for the 650 keV d(He-3,p)He-4 nuclear reaction. This examination will describe the basic physics associated with this reaction's production of 17.4 MeV protons and the processes used to fabricate the necessary materials used in the technique. Calculations of the delivered radiation dose, heat generation, and required exposure times are presented. Experimental data is also presented validating the dose calculations. The design of small, lower cost ion accelerators, as embodied in ''nested''-tandem and radio frequency quadrupole accelerators is examined, as is the potential use of high-output 3He and deuterium ion sources. Finally, potential clinical applications are discussed in terms of the advantages and disadvantages of this technique with respect to current radiotherapy methods and equipment. C1 UNIV NEW MEXICO,SCH MED,DEPT OTOLARYNGOL,ALBUQUERQUE,NM 87131. ACCSYS TECHNOL INC,PLEASANTON,CA. UNIV TEXAS,SW MED CTR,DEPT RADIAT ONCOL,AUSTIN,TX 78712. RP Horn, KM (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 35 TC 2 Z9 2 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 DEC PY 1995 VL 106 IS 1-4 BP 606 EP 617 DI 10.1016/0168-583X(95)00775-X PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100111 ER PT J AU Brown, IG Anders, A Anders, S Castro, RA Dickinson, MR MacGill, RA Wang, Z AF Brown, IG Anders, A Anders, S Castro, RA Dickinson, MR MacGill, RA Wang, Z TI Synthesis of unattainable ion implantation profiles - 'Pseudo-implantation' SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 9th International Conference on Ion Beam Modification of Materials (IBMM 95) CY FEB 05-10, 1995 CL AUSTR NATL UNIV, CANBERRA, AUSTRALIA SP Austr Natl Univ, Dept Electr Mat Engn, Acad Pr, Harcourt Brace Jovanovich, Alphatech Int Ltd, Austr Mat Res Soc, Balzers Austr P L, Danfysik A S, Elsevier, High Voltage Engn, IBM Austr, Natl Electrostat Corp, Stanton Sci HO AUSTR NATL UNIV ID SURFACE MODIFICATION; ARC; FILMS AB Metal implantation provides a powerful tool for the formation of non-equilibrium alloy layers for a wide variety of basic and applied materials applications, but the technique is fundamentally limited in two important ways: (i) the implanted species concentration is limited by sputtering of the modified layer by the incident ion beam itself, and the sputter-limited retained dose is often disappointingly low; (ii) the thickness of the modified layer is limited by the maximum ion energy available, and for practical reasons (implanter voltage) the layer thickness is often just a few hundred angstroms. We describe here a metal-plasma-immersion-based method for synthesizing non-equilibrium alloy layers of arbitrarily high dopant concentration and of arbitrary thickness. By repetitively pulse biasing the substrate to high negative voltage while it is immersed in the metal plasma from a vacuum are plasma gun, a layer can be synthesized that is atomically mixed into the substrate with an interface width determined by the early-time bias voltage and with a thickness determined by the overall duration of the process. The species is that of the vacuum are cathode material, which for this purpose can be a mixture of the substrate metal and the wanted dopant metal. We have used the method to form a high concentration Ta layer on the copper rails of an electromagnetic rail gun, with total surface area treated about 3000 cm(2); the Ta depth profile was flat at about 50 at.% Ta in Cu to a depth of about 1000 Angstrom. RP Brown, IG (reprint author), UNIV CALIF BERKELEY,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 20 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 DEC PY 1995 VL 106 IS 1-4 BP 646 EP 650 DI 10.1016/0168-583X(95)00781-4 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TM521 UT WOS:A1995TM52100117 ER PT J AU Saleh, HH Parish, TA Miller, WH Oigawa, H Raman, S AF Saleh, HH Parish, TA Miller, WH Oigawa, H Raman, S TI Measurements of the number of neutrons emitted per fission in a fast neutron spectrum for U-235, Np-237, and Am-243 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB Experiments were designed and performed to determine the number of neutrons emitted per fission, nu, for U-235, Np-237 and Am-243 in a fast neutron spectrum. The neutron emission rates were observed using three proton recoil detectors. The detection system's efficiency was determined using a Cf-252 source. The fission rate measurements were performed using solid state nuclear track detectors (SSNTD). The measured values of nu in the fast spectrum of the 144 keV silicon-filtered neutron beam for U-235, Np-237, and Am-243 are 2.54 +/- 0.06, 3.13 +/- 0.12, and 4.00 +/- 0.35, respectively. C1 UNIV MISSOURI,NUCL ENGN PROGRAM,COLUMBIA,MO 65211. JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Saleh, HH (reprint author), TEXAS A&M UNIV,DEPT NUCL ENGN,COLLEGE STN,TX 77843, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1995 VL 103 IS 4 BP 393 EP 400 DI 10.1016/0168-583X(95)00658-3 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TL184 UT WOS:A1995TL18400002 ER PT J AU Roberts, AD Nickles, RJ Paul, M Rehm, KE Jiang, CL Blumenthal, DJ Gehring, J Henderson, D Nolen, J Pardo, RC Schiffer, JP Segel, RE AF Roberts, AD Nickles, RJ Paul, M Rehm, KE Jiang, CL Blumenthal, DJ Gehring, J Henderson, D Nolen, J Pardo, RC Schiffer, JP Segel, RE TI Production of a radioactive F-18 ion beam for nuclear reaction studies SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB A two-stage method for generating a radioactive F-18 ion beam has been developed. F-18 is produced with a medical cyclotron by 11 MeV proton activation of [O-18]water, then chemically processed off-line for use in a tandem accelerator ion source. Azeotropic distillation reduces the O-18 component by 10(5), with a resulting O-18 to F-18 beam ratio of about 10(3). The average F-18(-) beam intensity per synthesis is 1 ppA over 120 min from a cesium vapor, sputter negative ion source (SNICS), with a peak intensity of 4.5 ppA. C1 UNIV WISCONSIN,MADISON,WI. HEBREW UNIV JERUSALEM,JERUSALEM,ISRAEL. ARGONNE NATL LAB,ARGONNE,IL 60439. NORTHWESTERN UNIV,EVANSTON,IL. NR 26 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1995 VL 103 IS 4 BP 523 EP 528 DI 10.1016/0168-583X(95)00657-5 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TL184 UT WOS:A1995TL18400023 ER PT J AU Jia, QX Wu, XD Zhou, DS Foltyn, SR Tiwari, P Peterson, DE Mitchell, TE AF Jia, QX Wu, XD Zhou, DS Foltyn, SR Tiwari, P Peterson, DE Mitchell, TE TI Deposition of epitaxial yttria-stabilized zirconia on single-crystal Si and subsequent growth of an amorphous SiO2 interlayer SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID STABILIZED ZIRCONIA; THIN-FILMS; BUFFER LAYERS; SILICON AB A processing technique is developed to fabricate single-crystal yttria-stabilized zirconia (YSZ) on amorphous SiO2 on (100) single-crystal Si. The YSZ layer shows high crystallinity with an ion beam channelling minimum of 11% from Rutherford backscattering. Even though there is a thick intervening amorphous SiO2 layer between the Si and the YSZ, the single-crystal YSZ layer is aligned with the crystal Si. The tilt and rotation variations are 0.64 degrees and 1.11 degrees respectively, based on X-ray diffraction omega-rocking curves on [100] and phi scans on [202] of YSZ films. The epitaxial nature of the YSZ on the thick SiO2 layer (from 10 to 100 nm) is further confirmed by high-resolution cross-sectional transmission electron microscopy analysis. This processing and the resulting multilayer structure might provide a new option for fabricating innovative microelectronic devices. RP Jia, QX (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87544, USA. RI Jia, Q. X./C-5194-2008 NR 18 TC 21 Z9 21 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD DEC PY 1995 VL 72 IS 6 BP 385 EP 391 DI 10.1080/09500839508242478 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA TL176 UT WOS:A1995TL17600004 ER PT J AU LYTLE, D AF LYTLE, D TI FIBER OPTIC BATTERY MONITOR SO PHOTONICS SPECTRA LA English DT Editorial Material RP LYTLE, D (reprint author), SANDIA NATL LABS,DEPT 1231,MAIL STOP 0527,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD DEC PY 1995 VL 29 IS 12 BP 44 EP & PG 0 WC Optics SC Optics GA TJ946 UT WOS:A1995TJ94600022 ER PT J AU DEN, T KOBAYASHI, T IZUMI, F KAMIYAMA, T SHIMAKAWA, Y JORGENSEN, JD ROTELLA, FJ HITTERMAN, RL AF DEN, T KOBAYASHI, T IZUMI, F KAMIYAMA, T SHIMAKAWA, Y JORGENSEN, JD ROTELLA, FJ HITTERMAN, RL TI ELECTRICAL-PROPERTIES AND CRYSTAL-STRUCTURES OF THE HOMOLOGOUS SERIES OF OXIDES ND2BA2CAMCENTI2-DELTA-CU2+DELTA-O11+M+2N (M, N=0 OR 1) SO PHYSICA C LA English DT Article ID RARE-EARTH; PEROVSKITE; COPPER; SUPERCONDUCTIVITY; DISTANCES; PHASES AB Four oxides belonging to the homologous series with the general formula Nd2Ba2CamCenTi2-deltaCu2+deltaO11+m+2n were prepared for m, n = 0 or 1. Although all of these oxides have two-dimensional CuO2 planes, they do not show any superconductivity, only a normal paramagnetic behavior. Their crystal structures were analyzed by TOF neutron powder diffraction. Nd2Ba2Ti1.908Cu2.092O11 (m = 0, n = 0 and delta = 0.09) is isomorphous with Gd2Ba2Ti2Cu2O11. The structures of the other three oxides can be derived from that of Nd2Ba2Ti1.908Cu2.092O11. The structure of Nd2Ba2Ti1.92Cu2.08O12 (m = 1, n = 0 and delta = 0.08) is obtained by the substitution of rock-salt-type (Ca,Nd,Ba)O-(Ca,Nd,Ba)O layers for the (Nd,Ba)O layer. The structure of Nd2Ba2CeTi2Cu2O13 (m = 0, n = 1 and delta = 0) is characterized by the insertion of fluorite-type (Nd,Ce)-O-2-(Nd,Ce) layers in place of the Nd layer, Nd2Ba2CaCeTi2Cu2O14 (m = 1, n = 1 and delta = 0) results from the alternate substitutions of rock-salt-type and fluorite-type layers for the (Nd,Ba)O and Nd layers, respectively. C1 NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN. UNIV TSUKUBA,INST MAT SCI,TSUKUBA,IBARAKI 305,JAPAN. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439. RP DEN, T (reprint author), CANON RES CTR,5-1 MORINOSATO WAKAMIYA,ATSUGI,KANAGAWA 24301,JAPAN. NR 34 TC 4 Z9 4 U1 5 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1995 VL 255 IS 1-2 BP 37 EP 52 DI 10.1016/0921-4534(95)00601-X PG 16 WC Physics, Applied SC Physics GA TJ309 UT WOS:A1995TJ30900005 ER PT J AU LINDEMER, TB SPECHT, ED MARTIN, PM FLITCROFT, ML AF LINDEMER, TB SPECHT, ED MARTIN, PM FLITCROFT, ML TI NONSTOICHIOMETRY, DECOMPOSITION AND T-C OF ND1+ZBA2-ZCU3OY1 SO PHYSICA C LA English DT Article ID SUPERCONDUCTING PROPERTIES; CRYSTAL-STRUCTURE; OXYGEN-DEFICIENT; YBA2CU3O7-X; ND1+XBA2-XCU3O7-DELTA; NDBA2CU3O7-Y; LABA2CU3OY; DIAGRAMS; SYSTEMS; GROWTH AB The temperature (T) and O-2 partial pressure (p[O-2]) dependence of oxygen content (y) in Nd1+zBa2-zCu3Oy were determined over the entire range of z. These data were represented by chemical thermodynamic models. The T-z-p[O-2] dependence of high-temperature decomposition was also determined, as were the effects of various T-t-p[O-2] treatments on the superconducting transition temperature (T-c). These results were compared with those from the Y and La homologs. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. BOISE STATE UNIV,DEPT PHYS,BOISE,ID 83725. RP LINDEMER, TB (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POST OFF BOX 2008,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009 OI Specht, Eliot/0000-0002-3191-2163 NR 30 TC 67 Z9 67 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1995 VL 255 IS 1-2 BP 65 EP 75 DI 10.1016/0921-4534(95)00493-9 PG 11 WC Physics, Applied SC Physics GA TJ309 UT WOS:A1995TJ30900008 ER PT J AU LINDEMER, TB SPECHT, ED AF LINDEMER, TB SPECHT, ED TI THE BAO-CU-CUO SYSTEM - SOLID-LIQUID EQUILIBRIA AND THERMODYNAMICS OF BACUO2 AND BACU2O2 SO PHYSICA C LA English DT Article ID NONSTOICHIOMETRY; YBA2CU3O7-X; SUPERCONDUCTORS; DECOMPOSITION; OXYGEN AB The effects of composition, temperature (T) and O-2 partial pressure (p[O-2]) on solid-liquid equilibria were determined experimentally for most of the phase fields in the BaO-Cu-CuO system. These relationships are illustrated in both a p[O-2]-10(4)/T diagram and in ternary phase diagrams. Thermodynamic values reported for BaCuO2 and BaCu2O2 by Voronin and Degterov [1-3] were verified via equilibria involving oxides, BaCO3, O-2, and CO2. The T-p[O-2]-y interdependence was determined for Ba2CuO3+y. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP LINDEMER, TB (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009 OI Specht, Eliot/0000-0002-3191-2163 NR 24 TC 26 Z9 26 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 DEC 1 PY 1995 VL 255 IS 1-2 BP 81 EP 94 DI 10.1016/0921-4534(95)00460-2 PG 14 WC Physics, Applied SC Physics GA TJ309 UT WOS:A1995TJ30900010 ER PT J AU KEATING, PB GULLEY, MS BRYANT, HC MACKERROW, EP MILLER, WA RISLOVE, DC COHEN, S DONAHUE, JB FITZGERALD, DH FUNK, DJ FRANKLE, SC HUTSON, RL MACEK, RJ PLUM, MA STANCIU, NG VANDYCK, OB WILKINSON, CA AF KEATING, PB GULLEY, MS BRYANT, HC MACKERROW, EP MILLER, WA RISLOVE, DC COHEN, S DONAHUE, JB FITZGERALD, DH FUNK, DJ FRANKLE, SC HUTSON, RL MACEK, RJ PLUM, MA STANCIU, NG VANDYCK, OB WILKINSON, CA TI ELECTRIC-FIELD-INDUCED ELECTRON DETACHMENT OF 800-MEV H- IONS SO PHYSICAL REVIEW A LA English DT Article ID PHOTODETACHMENT AB The lifetime of 800-MeV H- ions against electron detachment in a static electric field was measured over a range of eight orders of magnitude in experiments at the High Resolution Atomic Beam Facility of the Los Alamos Meson Physics Facility. The ions traversed a linear gradient magnetic field of 1.3-T peak strength resulting in a 6-MV/cm peak rest-frame electric field capable of stripping a large fraction of H- ions. The unstripped H- ions, neutral H-0 atoms, and protons were detected 5.5 m from the magnet. This spectrum was analyzed to determine the lifetime of the H- ion versus electric-field strength and the results were compared with previous studies. Three parametrizations of the lifetime formula based on an existing theory were used to calculate the stripping probability. The data were fit to the lifetime formula and good agreement with theoretical predictions was found. Finally, a possible experiment for observing excited states of H- is briefly discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KEATING, PB (reprint author), UNIV NEW MEXICO,ALBUQUERQUE,NM 87131, USA. NR 16 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1995 VL 52 IS 6 BP 4547 EP 4555 DI 10.1103/PhysRevA.52.4547 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA TK652 UT WOS:A1995TK65200034 ER PT J AU SCHAPHORST, SJ KRAUSE, MO CALDWELL, CD SAHA, HP PAHLER, M JIMENEZMIER, J AF SCHAPHORST, SJ KRAUSE, MO CALDWELL, CD SAHA, HP PAHLER, M JIMENEZMIER, J TI PHOTOIONIZATION OF ATOMIC OXYGEN AT THE MULTIPLET TERM LEVEL FROM 20 TO 212 EV SO PHYSICAL REVIEW A LA English DT Article ID IONIZATION CROSS-SECTIONS; RESOLVED PHOTOELECTRON SPECTROMETRY; SYNCHROTRON RADIATION; BRANCHING RATIOS; SPECTROSCOPY; CHLORINE; PHOTOIONISATION; PHOTOABSORPTION; THRESHOLD; ELECTRON AB The valence shell photoionization branching ratios of atomic oxygen are measured at the multiplet term level in a synchrotron-radiation-based electron spectrometry experiment and calculated using the multiconfiguration Hartree-Fock (MCHF) method for photon energies between 20 and 212 eV. The 2p (S-4,D-2,P-2) branching ratios, 2s P-2 to 2s P-4 intensity ratio, and 2s to 2p cross-section ratio for removal of a 2s of 2p electron are presented, and satisfactory agreement between the experiment and the MCHF calculation is found. In addition, the relative photoionization cross section is measured between 24 and 122 eV and is compared with calculations and a previous absolute cross-section measurement. Good agreement between the experimental and MCHF results is seen. C1 UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NATL AUTONOMOUS UNIV MEXICO,INST CIENCIAS NUCL,MEXICO CITY 04510,DF,MEXICO. RI Jimenez-Mier, Jose/A-5081-2009 OI Jimenez-Mier, Jose/0000-0002-5939-9568 NR 49 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1995 VL 52 IS 6 BP 4656 EP 4664 DI 10.1103/PhysRevA.52.4656 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA TK652 UT WOS:A1995TK65200046 ER PT J AU BALTZ, AJ AF BALTZ, AJ TI COULOMB POTENTIAL FROM A PARTICLE IN UNIFORM ULTRARELATIVISTIC MOTION SO PHYSICAL REVIEW A LA English DT Note ID POSITRON PAIR PRODUCTION; HEAVY-ION COLLISIONS AB The Coulomb potential produced by an ultrarelativistic particle (such as a heavy ion) in uniform motion is shown in the appropriate gauge to factorize into a longitudinal delta(z-t) dependence times a simple two-dimensional potential solution in the transverse direction. This form makes manifest the source of the energy independence of the interaction. RP BALTZ, AJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 6 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1995 VL 52 IS 6 BP 4970 EP 4971 DI 10.1103/PhysRevA.52.4970 PG 2 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA TK652 UT WOS:A1995TK65200082 ER PT J AU STROMHOLM, C SCHNEIDER, IF SUNDSTROM, G CARATA, L DANARED, H DATZ, S DULIEU, O KALLBERG, A AFUGGLAS, M URBAIN, X ZENGIN, V SUZORWEINER, A LARSSON, M AF STROMHOLM, C SCHNEIDER, IF SUNDSTROM, G CARATA, L DANARED, H DATZ, S DULIEU, O KALLBERG, A AFUGGLAS, M URBAIN, X ZENGIN, V SUZORWEINER, A LARSSON, M TI ABSOLUTE CROSS-SECTIONS FOR DISSOCIATIVE RECOMBINATION OF HD+ - COMPARISON OF EXPERIMENT AND THEORY SO PHYSICAL REVIEW A LA English DT Note ID POTENTIAL-ENERGY CURVES; STORAGE-RING; RYDBERG STATES; H-2; COLLISIONS; ELECTRONS; MOLECULE AB Absolute cross sections for dissociative recombination of HD+ were measured in the ion storage CRYRING for incident electron energies in the range 0.01-20 eV. The ions were stored for about 25 s before data taking, which is several orders of magnitude longer than their vibrational lifetimes towards spontaneous emission of infrared radiation. A broad resonance in the cross section at 5-12 eV is due to recombination into a manifold of doubly excited states. Multichannel quantum-defect theory was used to calculate the absolute cross section of this resonance. The calculations required inclusion of different mechanisms, such as dissociative autoionization, and many molecular states in order to reproduce the resonance region. Very good agreement of experiment and theory is found, and the results strongly reinforce that vibrationally cold ions were used in the experiment. C1 INST PHYS & TECHNOL RADIAT DEVICES,DEPT LASER,BUCHAREST,ROMANIA. UNIV STOCKHOLM,MANNE SIEGBAHN LAB,S-10405 STOCKHOLM,SWEDEN. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV PARIS 11,AIME COTTON LAB,ORSAY,FRANCE. UNIV CATHOLIQUE LOUVAIN,COLLIS LAB,B-1348 LOUVAIN,BELGIUM. UNIV PARIS 11,PHOTOPHYS MOLEC LAB,F-91405 ORSAY,FRANCE. UNIV PARIS 06,CHIM PHYS LAB,PARIS,FRANCE. RP STROMHOLM, C (reprint author), ROYAL INST TECHNOL,DEPT PHYS 1,S-10044 STOCKHOLM,SWEDEN. NR 38 TC 50 Z9 50 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 DEC PY 1995 VL 52 IS 6 BP R4320 EP R4323 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA TK652 UT WOS:A1995TK65200004 ER PT J AU Martins, GB Rao, D Barberis, GE Rettori, C Duro, RJ Sarrao, J Fisk, Z Oseroff, S Thompson, JD AF Martins, GB Rao, D Barberis, GE Rettori, C Duro, RJ Sarrao, J Fisk, Z Oseroff, S Thompson, JD TI Electron spin resonance of Er3+ in YBiPt SO PHYSICAL REVIEW B LA English DT Note ID MAGNETISM; YBBIPT; METALS AB We report low-temperature electron spin resonance (ESR) measurements in YBiPt, doped with 0.1% Er substituting for Y. The results show that Er3+ is located at a cubic lattice site and has a Gamma(8)((3)) as ground state and an overall crystal-field splitting of similar to 85(20) K. From the ESR spectra we inferred the existence of lattice distortions at the rare-earth site. These results may help in understanding the heavy-fermion system YbBiPt, which has the same structure as YBiPt. C1 UNIV LA CORUNA,DEPT INGN IND,E-15403 FERROL,SPAIN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306. SAN DIEGO STATE UNIV,DEPT PHYS,SAN DIEGO,CA 92182. RP Martins, GB (reprint author), UNIV ESTADUAL CAMPINAS,INST FIS GLEB WATAGHIN,BR-13083970 SAO PAULO,BRAZIL. RI Rettori, Carlos/C-3966-2012; Martins, George/C-9756-2012 OI Rettori, Carlos/0000-0001-6692-7915; Martins, George/0000-0001-7846-708X NR 16 TC 4 Z9 4 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 DEC 1 PY 1995 VL 52 IS 21 BP 15062 EP 15065 DI 10.1103/PhysRevB.52.15062 PG 4 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900010 ER PT J AU Norman, MR AF Norman, MR TI Odd parity and line nodes in heavy-fermion superconductors SO PHYSICAL REVIEW B LA English DT Note ID UPT3; SYMMETRY; STATES AB Group theory arguments have demonstrated that a general odd-parity order parameter cannot have line nodes in the presence of spin-orbit coupling. In this paper, it is shown that these arguments do not hold on the k(z) = pi/c zone face of a hexagonal close-packed lattice. In particular, three of the six odd-parity representations vanish identically on this face. This has potential relevance to the heavy fermion superconductor UPt3. RP Norman, MR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Norman, Michael/C-3644-2013 NR 12 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 21 BP 15093 EP 15094 DI 10.1103/PhysRevB.52.15093 PG 2 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900018 ER PT J AU Norman, MR Randeria, M Ding, H Campuzano, JC Bellman, AF AF Norman, MR Randeria, M Ding, H Campuzano, JC Bellman, AF TI Polarization selection rules and superconducting gap anisotropy in Bi2Sr2CaCu2O8 SO PHYSICAL REVIEW B LA English DT Note AB We discuss polarization selection rules for angle-resolved photoemission spectroscopy in Bi2212. Using these we show that the hump in the superconducting gap observed in the X quadrant in our earlier work is not on the main CuO2 band, but rather on an umklapp band arising from the structural superlattice. The intrinsic gap Is most likely quite small over a range of +/- 10 degrees about the diagonal directions. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. RP Norman, MR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Campuzano, Juan Carlos/G-4358-2012; Norman, Michael/C-3644-2013; OI Ding, Hong/0000-0003-4422-9248 NR 19 TC 34 Z9 34 U1 0 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 21 BP 15107 EP 15110 DI 10.1103/PhysRevB.52.15107 PG 4 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900022 ER PT J AU Kwon, I Collins, LA Kress, JD Troullier, N AF Kwon, I Collins, LA Kress, JD Troullier, N TI First-principles study of solid Ar and Kr under high compression SO PHYSICAL REVIEW B LA English DT Article ID HIGH-PRESSURE; METALLIZATION; XENON; STATE; EQUATION; KRYPTON; ARGON; PSEUDOPOTENTIALS; TRANSITIONS; STRESS AB We have performed first-principles total energy calculations for solid Ar and Kr to study phase transitions under high pressure. We used relativistic, nonlocal, norm-conserving pseudopotentials with a plane wave basis in solving the Kohn-Sham equations within the local density approximation for fee, hcp, and bcc structures of Ar and Kr. Within the volume range we have studied (V/V-o = 1.0 to 0.1, where V-o is the observed volume at 1 atm and 0 K), both Ar and Kr undergo a phase transition from the fee to the hcp structure at pressures of about 220 and 130 GPa, respectively, and the insulator-metal transition should occur around 510 GPa (Ar) and 310 GPa (Kr) in the hcp phase. C1 UNIV MINNESOTA,MINNESOTA SUPERCOMP INST,MINNEAPOLIS,MN 55455. RP Kwon, I (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 23 TC 30 Z9 31 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 21 BP 15165 EP 15169 DI 10.1103/PhysRevB.52.15165 PG 5 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900029 ER PT J AU Xu, ZD Liu, Y Johnson, PD Itchkawitz, BS AF Xu, ZD Liu, Y Johnson, PD Itchkawitz, BS TI Magnetic structure of monolayer-range Cr films deposited on Fe(001) SO PHYSICAL REVIEW B LA English DT Article ID SPIN POLARIZATION ANALYZER; THIN-FILMS; FE(100); SUPERLATTICES; PREDICTION; LAYERS AB Spin polarized photoemission is used to examine the development of the magnetic structure in Cr films deposited on an Fe(001) substrate at 50 degrees C. The spin polarization of the Cr core levels provides a clear indication that within the initial monolayer the moments are antiferromagnetically aligned to those of the substrate. Through comparison with model tight-binding calculations it is shown that at the monolayer limit the Cr moments are of the order of 1.8 mu(B) or larger. Subsequent Cr monolayers align antiferromagnetically with respect to the previous layer. The tight-binding calculations further indicate that as the Cr film thickness evolves the moment at the solid-vacuum interface is always enhanced. C1 MAX PLANCK GESELL,FRITZ HABER INST,D-14195 BERLIN,GERMANY. RP Xu, ZD (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 32 TC 23 Z9 23 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 DEC 1 PY 1995 VL 52 IS 21 BP 15393 EP 15397 DI 10.1103/PhysRevB.52.15393 PG 5 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900056 ER PT J AU Hirota, K Shirane, G Harris, QJ Feng, Q Birgeneau, RJ Hase, M Uchinokura, K AF Hirota, K Shirane, G Harris, QJ Feng, Q Birgeneau, RJ Hase, M Uchinokura, K TI Characterization of the structural and magnetic fluctuations near the spin-Peierls transition in CuGeO3 SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-SCATTERING; X-RAY; CHAIN; GAP; TTF AB Extensive neutron-scattering experiments have been performed on CuGeO3 single crystals to study the structural fluctuations in the neighborhood of the spin-Peierls transition at temperature TSP We have succeeded in measuring the critical fluctuations up to a few K above TSP The inverse correlation lengths K associated with the structural fluctuations obtained along the [1 0 1] and [0 1 0] directions are consistent with those reported in the low-resolution diffuse x-ray-scattering measurements of Pouget et al. This agreement implies that the energy-integrated scattering function S(Q)=integral(-infinity)(infinity)S(Q,omega)d omega measured by diffuse x-ray scattering is dominated by structural fluctuations around omega=0, not by the softening of a zone-boundary phonon as expected in ordinary spin-Peierls systems. In order to examine the relationship between magnetic and structural fluctuations, further information on the magnetic excitations was collected. There remains considerable intensity above T-SP in the spin-excitation spectrum at (1/2 1 1/2), slowly decaying over a wide energy range (similar to 10 meV) and persisting up to about 50 K. We measured the magnetic dynamical structure factor S(Q, omega) over a wide range of energy and momentum space at temperatures of 4 K (<T-SP). The wave-vector dependent susceptibility chi(Q) deduced from the S(Q, omega) contour map at 16 K yields inverse correlation lengths consistent with those which we determined for the structural fluctuations. This indicates a strong symbiotic coupling between the magnetic and structural fluctuations near TSP as expected. We speculate that the Cu ions are surrounded by strongly correlated spins and that the motions are heavily overdamped. The structural fluctuations towards dimerization are accompanied by magnetic correlations leading to a spin-singlet state. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV TOKYO,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN. RI Hirota, Kazuma/C-6797-2008; Hase, Masashi/B-8900-2008 OI Hase, Masashi/0000-0003-2717-461X NR 41 TC 37 Z9 37 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 DEC 1 PY 1995 VL 52 IS 21 BP 15412 EP 15419 DI 10.1103/PhysRevB.52.15412 PG 8 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900058 ER PT J AU Harris, QJ Feng, Q Birgeneau, RJ Hirota, K Shirane, G Hase, M Uchinokura, K AF Harris, QJ Feng, Q Birgeneau, RJ Hirota, K Shirane, G Hase, M Uchinokura, K TI Large length-scale fluctuations at the spin-Peierls transition in CuGeO3 SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-SCATTERING; RANDOM-FIELD; ISING-MODEL; CRITICAL EXPONENTS; SYSTEMS; INSTABILITY; MNXZN1-XF2; BEHAVIOR; RBCAF3; CHAIN AB We report a detailed synchrotron x-ray-scattering study of the structural fluctuations near the spin-Peierls transition in CuGeO3. Below the transition temperature T-SP, the superlattice peak profile is resolution limited and the peak intensity, which is proportional to the order parameter squared, is well described by a simple power law, (1-T/T-SP)(2 beta). The fitted value of beta, 0.33(3), agrees quantitatively with previously reported results from neutron-diffraction measurements. Above the transition temperature T-SP, pretransitional lattice fluctuations are observed within about 1 K above T-SP The length scale of these fluctuations is about an order of magnitude larger than that characterizing the bulk critical fluctuations. The line shape of these large length-scale scale fluctuations is consistent with a Lorentzian-squared form. The measured critical exponents associated with the large length-scale fluctuations are nu=0.56(9), and gamma=2.0(3). Similar large length-scale fluctuations have been observed at the structural transitions in some perovskites and the magnetic transitions in holmium and terbium. We suggest that in CuGeO3 the large length-scale fluctuations reflect the disconnected susceptibility originating from random field Ising-type local defects. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV TOKYO,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN. RP Harris, QJ (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Hirota, Kazuma/C-6797-2008; Hase, Masashi/B-8900-2008 OI Hase, Masashi/0000-0003-2717-461X NR 40 TC 32 Z9 32 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 21 BP 15420 EP 15425 DI 10.1103/PhysRevB.52.15420 PG 6 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900059 ER PT J AU Quijada, MA Tanner, DB Chou, FC Johnston, DC Cheong, SW AF Quijada, MA Tanner, DB Chou, FC Johnston, DC Cheong, SW TI Optical properties of single-crystal La2CuO4+delta SO PHYSICAL REVIEW B LA English DT Review ID HIGH-TC SUPERCONDUCTOR; ELECTROCHEMICALLY OXIDIZED LA2CUO4+DELTA; HIGH-TEMPERATURE SUPERCONDUCTORS; STRONG ELECTRON-PHONON; INFRARED PROPERTIES; PHASE-SEPARATION; MAGNETIC-PROPERTIES; LATTICE-VIBRATIONS; PENETRATION DEPTH; RAMAN-SCATTERING AB The c-axis and ab-plane optical reflectance of an electrochemically oxidized single crystal of La2CuO4+delta (T-c similar to 40 K; delta similar to 0.12) have been measured over a wide frequency range (30-40 000 cm(-1)) and at temperatures between 10 and 300 K. The ab-plane optical conductivity shows metallic behavior at low frequency with weak phonon features whereas the c-axis spectrum is typical of an insulator, showing only phonons. Estimates of the carrier density and the oxygen concentration suggest that each excess oxygen contributes just over one mobile hole. The ab-plane midinfrared conductivity obtained when the wave vector q of the light is perpendicular to the CuO2 planes in the sample exhibits structure that is absent when q is parallel to the basal planes. The ab-plane conductivity shows a strong departure from Drude metallic response; fits to midinfrared models with frequency-dependent damping require also an additional bound-carrier contribution. A superconducting condensate is evident in the low-frequency ab-plane data; the oscillator strength of this condensate contains about 18% of the doping induced or 80% of the free carrier spectral weight in the normal state. Finally, an anomalous temperature dependence is found in the visible/ultraviolet region of the spectrum. C1 UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. IOWA STATE UNIV,DEPT PHYS & ASTRON,AMES,IA 50011. AMES LAB,AMES,IA 50011. AT&T BELL LABS,MURRAY HILL,NJ 07974. NR 110 TC 43 Z9 43 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 21 BP 15485 EP 15503 DI 10.1103/PhysRevB.52.15485 PG 19 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900065 ER PT J AU Panetta, PD Ostenson, JE Finnemore, DK Snead, CL AF Panetta, PD Ostenson, JE Finnemore, DK Snead, CL TI Pinning mechanisms in YBa2Cu3O7-delta single crystals SO PHYSICAL REVIEW B LA English DT Article ID DEFECTS; SUPERCONDUCTORS AB Systematic studies of flux pinning in YBa2Cu3O7-delta single crystals have been undertaken in an attempt to isolate the mechanisms that may cause the so-called fishtail pinning effect, a rise in critical current density (J(c)) that occurs as the magnetic field (H) increases. Two different sources of point defect pinning, 200 MeV proton irradiation and oxygen annealing, are used to alter the system and to determine how each one changes the J(c) vs H curves. The fishtail pinning effect is extremely robust and survives both in magnitude and with a similar slope of the J(c) vs H curve for a wide range of irradiation and for wide excursions in oxygen content and annealing condition. The data are consistent with an intrinsic granularity arising from cation disorder that survives as oxygen is inserted and removed and as irradiation induced point defects are added and removed. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. BROOKHAVEN NATL LAB, DEPT ADV TECHNOL, UPTON, NY 11973 USA. RP Panetta, PD (reprint author), IOWA STATE UNIV SCI & TECHNOL, USDA, AMES LAB, AMES, IA 50011 USA. RI Panetta, Paul/P-5339-2014 OI Panetta, Paul/0000-0001-6974-1112 NR 10 TC 5 Z9 5 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 21 BP 15570 EP 15574 DI 10.1103/PhysRevB.52.15570 PG 5 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900076 ER PT J AU Statt, BW Hammel, PC Fisk, Z Cheong, SW Chou, FC Johnston, DC Schirber, JE AF Statt, BW Hammel, PC Fisk, Z Cheong, SW Chou, FC Johnston, DC Schirber, JE TI Oxygen ordering and phase separation in La2CuO4+delta SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING LA2CUO4+DELTA; SPIN DYNAMICS; LA2-XSRXCUO4; NQR; LA-139; LA2CUO4.032; CU AB We present a detailed NMR study of the expected A and anomalous B Cu lines on a single crystal of La2CuO4+delta Our results in conjunction with those of neutron scattering and La NMR lead us to conclude that oxygen ordering occurs on a microscopic scale in this compound. The ordered interstitial oxygen gives rise to a distribution of tilts of the CuO6 octahedra in the B domains. A sawtooth modulation of the octahedral tilt, in which the sign of the tilt changes when the tilt reaches a maximum value, is deduced. In addition we show that macroscopic phase separation is inhibited in the tetragonal phase where the CuO6 octahedra are not tilted. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV TORONTO,DEPT PHYS,TORONTO,ON M5S 1A7,CANADA. RP Statt, BW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 30 TC 60 Z9 60 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 DEC 1 PY 1995 VL 52 IS 21 BP 15575 EP 15581 DI 10.1103/PhysRevB.52.15575 PG 7 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900077 ER PT J AU Chmaissem, O Argyriou, DN Hinks, DG Jorgensen, JD Storey, BG Zhang, H Marks, LD Wang, YY Dravid, VP Dabrowski, B AF Chmaissem, O Argyriou, DN Hinks, DG Jorgensen, JD Storey, BG Zhang, H Marks, LD Wang, YY Dravid, VP Dabrowski, B TI Chromium clustering and ordering in Hg1-xCrxSr2CuO4+delta SO PHYSICAL REVIEW B LA English DT Article ID FLUX PINNING ENHANCEMENT; NEUTRON-IRRADIATION; SINGLE-CRYSTALS; SUPERCONDUCTIVITY; YBA2CU3O7-DELTA; TEMPERATURE; LINE AB Solid-solution compounds where Cr, Re, and other metals are substituted for Hg in Hg-Ca-Ba-Cu-O superconductors have been reported to exhibit enhanced flux-pinning behavior. We have determined the structural modifications resulting from the incorporation of Cr in Hg1-xCrxSr2CuO4+delta (for x approximate to 0.4) using neutron powder diffraction, electron diffraction, and lattice imaging. Cr substitutes at the Hg site, but is displaced to allow tetrahedral coordination by oxygen atoms. Additional oxygen is incorporated to provide four oxygen atom neighbors for each Cr atom. These CrO4 units cluster to form a supercell of approximate dimensions 5aX5aX2e in which Cr-rich and Hg-rich regions alternate in all three crystallographic directions. Because the Cu-O apical bond associated with the CrO4 unit is lengthened to 3.13 Angstrom, the superconducting planes are best viewed as consisting of CuO5 pyramids, oriented up or down as dictated by the supercell ordering, rather than CuO6 octahedra. Local structural constraints associated with individual Cr sites require that considerable disorder is present, even in the supercell. Extended defects in this supercell (e.g., columns of CuO6 octahedra associated with Hg-rich regions) may contribute to the enhanced flux pinning. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCONDUCT,EVANSTON,IL 60208. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP Chmaissem, O (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Dravid, Vinayak/B-6688-2009; Marks, Laurence/B-7527-2009 NR 24 TC 47 Z9 47 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 DEC 1 PY 1995 VL 52 IS 21 BP 15636 EP 15643 DI 10.1103/PhysRevB.52.15636 PG 8 WC Physics, Condensed Matter SC Physics GA TK979 UT WOS:A1995TK97900085 ER PT J AU Sinkovic, B Shekel, E Hulbert, SL AF Sinkovic, B Shekel, E Hulbert, SL TI Spin-resolved Fe L(3)M(45)M(45) Auger transition on and off resonance: The effect of exchange correlation SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC CIRCULAR-DICHROISM; AUGER-SPECTRA; SPECTROSCOPY; SPLITTINGS; FE(100); SOLIDS; STATES AB Spin-resolved Fe L(3)M(45)M(45) Auger-electron spectra were recorded with on- and off-resonant (2p(3/2)-->3d*) photons. The spectra agree with convolution of spin-resolved Fe density of states, except in the degree of spin polarization which was found to be higher (lower) than the spin polarization of Fe valence electrons when using on- (off-) resonant photon excitation. This is consistent with a reduction of the Auger transition probability of the spin-parallel two-hole final state as compared to spin-antiparallel state, which indicates the importance of exchange correlation in 3d itinerant ferromagnets such as Fe. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE DEPT,UPTON,NY 11973. RP Sinkovic, B (reprint author), NYU,DEPT PHYS,2 WASHINGTON PL,NEW YORK,NY 10003, USA. NR 31 TC 18 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 22 BP 15703 EP 15706 PG 4 WC Physics, Condensed Matter SC Physics GA TL813 UT WOS:A1995TL81300006 ER PT J AU Pollack, L Hoch, MJR Jin, C Smith, EN Parpia, JM Hawthorne, DL Geller, DA Lee, DM Richardson, RC Hinks, DG Bucher, E AF Pollack, L Hoch, MJR Jin, C Smith, EN Parpia, JM Hawthorne, DL Geller, DA Lee, DM Richardson, RC Hinks, DG Bucher, E TI Low-temperature order in the heavy-fermion compound CeCu6 SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC ORDER; RESONANCE; CECU2SI2; CEAL3; HE-3 AB We have used nuclear-quadrupole-resonance (NQR) techniques to study Cu nuclei in two single-crystal samples of CeCu6 between 200 mu K and 20 mK. We present measurements of the NQR intensities and spin-lattice relaxation times, T-1, at frequencies corresponding to three different sites in the crystal. Below 5 mK we observe deviations from standard metallic behavior in both signal intensity and spin-lattice relaxation times. These deviations are unusual in that they are site dependent; they reveal the presence of one or more types of order in this system. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV WITWATERSRAND,DEPT PHYS,WITWATERSRAND 2050,SOUTH AFRICA. RP Pollack, L (reprint author), CORNELL UNIV,CTR MAT SCI,CORNELL MICROKELVIN LAB,ITHACA,NY 14853, USA. NR 24 TC 24 Z9 24 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 22 BP 15707 EP 15710 PG 4 WC Physics, Condensed Matter SC Physics GA TL813 UT WOS:A1995TL81300007 ER PT J AU Abrikosov, AA AF Abrikosov, AA TI Parity of the order parameter in high-temperature superconductors with respect to a pi/2 rotation SO PHYSICAL REVIEW B LA English DT Note AB In order to establish the parity of the order parameter in the model based on the idea of a strong phonon-mediated long-range attraction, enhanced by the extended saddle-point singularities in the electron spectrum, plus a weak short-range repulsion, a comparison of critical temperatures and free energies of the even and odd solutions for the order parameter is performed. A criterion is established distinguishing the two options. It is shown, particularly, that superconductivity, induced by phonons, can, nevertheless, lead to an odd order parameter. On the other hand, contrary to the previous statements, this is the only possibility for the order parameter to change its sign within this model. The theory is influenced by the latest experimental results. RP Abrikosov, AA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 18 TC 37 Z9 37 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 22 BP 15738 EP 15740 PG 3 WC Physics, Condensed Matter SC Physics GA TL813 UT WOS:A1995TL81300015 ER PT J AU Holmes, NC Ross, M Nellis, WJ AF Holmes, NC Ross, M Nellis, WJ TI Temperature measurements and dissociation of shock-compressed liquid deuterium and hydrogen SO PHYSICAL REVIEW B LA English DT Article ID INSULATOR-METAL TRANSITION; ONE-COMPONENT PLASMA; EQUATION-OF-STATE; MOLECULAR-HYDROGEN; HIGH-DENSITY; FLUID NITROGEN; SOLID HYDROGEN; PRESSURES; METALLIZATION; POINT AB Temperatures of shock compressed liquid deuterium and hydrogen up to 5200 K were measured at pressures up to 83 GPa (830 kbar). The measurements are in excellent agreement with earlier calculations to about 20 GPa and show evidence for dissociation above 20 GPa. At the highest measured temperatures and pressures current theories break down and a revised theory is proposed. RP Holmes, NC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 45 TC 183 Z9 189 U1 0 U2 12 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 DEC 1 PY 1995 VL 52 IS 22 BP 15835 EP 15845 DI 10.1103/PhysRevB.52.15835 PG 11 WC Physics, Condensed Matter SC Physics GA TL813 UT WOS:A1995TL81300029 ER PT J AU Hahn, W Loewenhaupt, M Huang, YY Felcher, GP Parkin, SSP AF Hahn, W Loewenhaupt, M Huang, YY Felcher, GP Parkin, SSP TI Experimental determination of the magnetic phase diagram of Gd/Fe multilayers SO PHYSICAL REVIEW B LA English DT Article ID SUPERLATTICES; MAGNETORESISTANCE; TRANSITIONS; FERRIMAGNET; FE AB By combining magnetization, Ken effect measurements, and polarized neutron reflectometry we have determined the magnetic state of [Fe 35 Angstrom/Gd 50 Angstrom]x15 multilayers at different points of the H-T phase diagram. We confirm the predictions of Camley and co-workers for an idealized magnetic superlattice with antiferromagnetic interfacial coupling. The magnetic moments of the Fe and Gd layers are opposite with those of Gd becoming larger below a compensating temperature. The magnetic moments are aligned parallel to the applied magnetic field below a certain value, and then they take a twisted arrangement as the field is increased. The transition may start from the surface or the interior, depending on whether the magnetization of the surface layer is oriented in or opposite to the field direction. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. IBM CORP, ALMADEN RES CTR, SAN JOSE, CA 95120 USA. RP FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, POSTFACH 1913, D-52425 JULICH, GERMANY. RI Parkin, Stuart/D-2521-2012 NR 20 TC 54 Z9 54 U1 0 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1995 VL 52 IS 22 BP 16041 EP 16048 DI 10.1103/PhysRevB.52.16041 PG 8 WC Physics, Condensed Matter SC Physics GA TL813 UT WOS:A1995TL81300056 ER PT J AU GarciaSolis, EJ Mignerey, AC Madani, H Marchetti, AA Russ, DE Shapira, D AF GarciaSolis, EJ Mignerey, AC Madani, H Marchetti, AA Russ, DE Shapira, D TI Mass and charge distributions for the reaction Ca-40+Bi-209 at 600 Mev SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION REACTIONS; EXCITATION-ENERGY; ANGULAR-MOMENTUM; DAMPED REACTIONS; COLLISIONS; TRANSPORT; NUCLEON; MEV/NUCLEON; EXCHANGE; DIVISION AB The charge and mass of the projectile-like fragments produced in the 15-MeV per nucleon Ca-40+Bi-209 reaction were determined for products detected near the grazing angle. Neutron number-charge (N-Z) distributions were generated as a function of the total kinetic energy loss and parametrized by their centroids, variances, and correlation coefficients. Although the initial system is very asymmetric, after the interaction. a drift of the charge and mass centroids toward further asymmetry is observed. The production of projectile-like fragments is consistent with a tendency of the projectile-like fragments to retain the Projectile neutron-toproton ratio (N)/(Z)similar or equal to 1 The correlation coefficient remains well below 1.0 for the entire range of total kinetic energy lost. Predictions of two nucleon exchange models, Randrup's and Tassan-Got's, are compared to the experimental results. The models are not able to reproduce the evolution of the experimental distributions, especially the fact that the variances reach maximum and then decrease as function of the energy loss. This behavior supports the hypothesis that some form of projectile-like fragmentation or cluster emission is perturbing the product distribution from that expected from a damped mechanism. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP GarciaSolis, EJ (reprint author), UNIV MARYLAND,DEPT CHEM,COLLEGE PK,MD 20742, USA. RI Mignerey, Alice/D-6623-2011 NR 32 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1995 VL 52 IS 6 BP 3114 EP 3125 DI 10.1103/PhysRevC.52.3114 PG 12 WC Physics, Nuclear SC Physics GA TL812 UT WOS:A1995TL81200032 ER PT J AU Sun, Y Guidry, M AF Sun, Y Guidry, M TI Quantitative description of superdeformed bands with the projected shell model SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN STATES; ROTATIONAL BANDS; NUCLEI; ALIGNMENT; ODD; REGION; LINE AB We propose a theoretical description of superdeformed bands based on the projected shell model. The shell model basis is constructed at the superdeformed minimum and projected onto states of good angular momentum, and a two-body Hamiltonian is then diagonalized in this basis. We take the superdeformed band in Ce-132 as an example. Good agreement with the measured gamma-ray energies allows us to suggest spin values for these superdeformed states. Finally, we propose an explanation for the recently observed Delta I=4 bifurcation disappearance at a rotational frequency of HBAR omega similar or equal to 0.65 in this nucleus. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP Sun, Y (reprint author), OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831, USA. RI Sun, Yang/P-2417-2015 NR 28 TC 38 Z9 40 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 DEC PY 1995 VL 52 IS 6 BP R2844 EP R2847 PG 4 WC Physics, Nuclear SC Physics GA TL812 UT WOS:A1995TL81200006 ER PT J AU ATWOOD, D KAGAN, A RIZZO, TG AF ATWOOD, D KAGAN, A RIZZO, TG TI CONSTRAINING ANOMALOUS TOP-QUARK COUPLINGS AT THE FERMILAB-TEVATRON SO PHYSICAL REVIEW D LA English DT Article ID COMPOSITE STRUCTURE; POLARIZATION; TECHNICOLOR; COLLIDERS; LIMITS; MODEL AB We explore the influence of an anomalous chromomagnetic moment kappa on the production characteristics of top quark pairs at the Fermilab Tevatron with a center-of-mass energy of root s = 1.8 TeV. We find that for top quarks in the 175 GeV mass range, present measurements are probing values of kappa of order 0.25. We discuss a class of technicolor models with techniscalars which may produce such large values of kappa in conjunction with the generation of m(t). For kappa's in this range we find that significant enhancements in both the q (q) over bar, gg --> t (t) over bar production cross sections are obtained. Once sufficient statistics have been accumulated and QCD uncertainties are under control, future high precision measurements at the Fermilab Tevatron will eventually be sensitive to values of kappa with magnitudes smaller than similar or equal to 0.1. RP ATWOOD, D (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 43 TC 82 Z9 82 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 DEC 1 PY 1995 VL 52 IS 11 BP 6264 EP 6270 DI 10.1103/PhysRevD.52.6264 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TH212 UT WOS:A1995TH21200006 ER PT J AU ATWOOD, D SONI, A AF ATWOOD, D SONI, A TI NEUTRAL-HIGGS-BOSON CP VIOLATION AT MU(+)MU(-) COLLIDERS SO PHYSICAL REVIEW D LA English DT Article ID TOP-QUARK; TAU-POLARIZATION; T(T)OVER-BAR; PHYSICS; DECAYS; W+W AB CP-violating asymmetries in both the production and the decays of s-channel neutral Higgs bosons at mu(+) mu(-) colliders can be large. If the CP violation occurs in the muon-Higgs-boson coupling, one observes a production asymmetry with transversely polarized mu(+) mu(-) beams. Likewise if the CP violation occurs in the top-quark-Higgs-boson or tau-Higgs-boson coupling, one observes an azimuthal decay asymmetry in mu(+) mu(-) --> t (t) over bar (or tau(+) tau(-)). CP studies at such colliders allow a uniquely clean way of deducing the underlying CP phases; in turn these parameters would significantly improve our understanding of baryogenesis. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP ATWOOD, D (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 32 TC 41 Z9 43 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 DEC 1 PY 1995 VL 52 IS 11 BP 6271 EP 6277 DI 10.1103/PhysRevD.52.6271 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TH212 UT WOS:A1995TH21200007 ER PT J AU BRODSKY, SJ TANG, WK HOYER, P AF BRODSKY, SJ TANG, WK HOYER, P TI SYSTEMATICS OF HEAVY-QUARK PRODUCTION IN HIGH-ENERGY ELECTRON-PROTON COLLISIONS SO PHYSICAL REVIEW D LA English DT Article ID PI-N INTERACTIONS; QUANTUM CHROMODYNAMICS; J/PSI PHOTOPRODUCTION; INTRINSIC CHARM; FEYNMAN-X; DEPENDENCE; QCD; NUCLEON AB We discuss heavy quark and quarkonium production in various kinematic regions at the HERA ep collider. In contrast to fixed target experiments, collider kinematics allows the possibility of detailed measurements of particle production in the proton fragmentation region. One thus can study parton correlations in the proton Fock states materialized by the virtual photon probe. We discuss various configurations of inelastic electron-proton scattering, including peripheral, diffractive, and deep inelastic processes. In particular, we show that intrinsic heavy quark Fock states can be identified by the observation of quarkonium production at large x(F) and at a low mean transverse momentum which is insensitive to the virtuality Q(2) of the photon. C1 NORDITA, DK-2100 COPENHAGEN, DENMARK. RP STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 50 TC 9 Z9 9 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1995 VL 52 IS 11 BP 6285 EP 6290 DI 10.1103/PhysRevD.52.6285 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TH212 UT WOS:A1995TH21200009 ER PT J AU BURDMAN, G GOLOWICH, E HEWETT, JL PAKVASA, S AF BURDMAN, G GOLOWICH, E HEWETT, JL PAKVASA, S TI RADIATIVE WEAK DECAYS OF CHARM MESONS SO PHYSICAL REVIEW D LA English DT Article ID RARE B-DECAYS; QCD; MODEL AB We address standard model predictions for flavor-changing radiative transitions of the pseudoscalar charm mesons. Short-distance contributions in D radiative transitions are contrasted with those in B decays. A full analysis is presented of the c --> u + gamma electromagnetic penguin amplitude with QCD radiative corrections included. Given the importance of long-range effects for the charm sector, special attention is paid to such contributions as the vector dominance and pole amplitudes. A number of two-body final states in exclusive charm radiative decays is considered and the corresponding branching ratio predictions are given. C1 UNIV MASSACHUSETTS, DEPT PHYS & ASTRON, AMHERST, MA 01003 USA. STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. UNIV HAWAII, DEPT PHYS & ASTRON, HONOLULU, HI 96822 USA. RP FERMILAB NATL ACCELERATOR LAB, POB 500, BATAVIA, IL 60510 USA. RI Burdman, Gustavo/D-3285-2012 NR 61 TC 79 Z9 80 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1995 VL 52 IS 11 BP 6383 EP 6399 DI 10.1103/PhysRevD.52.6383 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TH212 UT WOS:A1995TH21200021 ER PT J AU BURDMAN, G AF BURDMAN, G TI TESTING THE STANDARD MODEL IN B-]K(ASTERISK)L(+)L(-) SO PHYSICAL REVIEW D LA English DT Article ID RARE B-DECAYS; B->S-GAMMA; BBAR AB We study the potential of B --> K(*)l(+)l(-) decays as tests of the standard model. After discussing the reliability of theoretical predictions for the hadronic matrix elements involved, we examine the impact of different new physics scenarios on various observables. We show that the angular information in B --> K*l(+)l(-) together with the dilepton mass distribution can highly constrain new physics. This is particularly true in the large dilepton mass region, where reliable predictions for the hadronic matrix elements can be made with presently available data. As illustrative examples, we compare the standard model predictions with those of two-Higgs-doublet models as well as top-color models, all of which give distinct signals in this region. RP BURDMAN, G (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. RI Burdman, Gustavo/D-3285-2012 NR 31 TC 102 Z9 102 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 DEC 1 PY 1995 VL 52 IS 11 BP 6400 EP 6410 DI 10.1103/PhysRevD.52.6400 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TH212 UT WOS:A1995TH21200022 ER PT J AU WU, YY AF WU, YY TI MINIMAL SUPERSYMMETRIC MODEL OF HIGGS-HIGGS CONDENSATION SO PHYSICAL REVIEW D LA English DT Article ID SUPERSTRING-INSPIRED MODELS; DYNAMIC SYMMETRY-BREAKING; TOP QUARK MASS; STANDARD MODELS; NATURAL SOLUTION; HIDDEN SECTOR; MU-PROBLEM; SUPERGRAVITY; ENERGY; BOSON AB This paper is motivated by three issues associated with the supersymmetric extension of the standard model: the mu problem, the possibility of raising the upper bound on the lightest-Higgs-boson mass, and the triviality problem associated with the Higgs sector. A new scheme based on Higgs-Higgs condensation at low energy is proposed, and it is shown that these three issues are well solved by this scheme. As the first realization of this new scheme, the minimal supersymmetric model of Higgs-Higgs condensation (MSMHHC) is constructed and studied in detail. The MSMHHC is identical with the MSSM (minimal supersymmetric standard model) in fundamental particle content, and their Lagrangians differ only hi the Higgs sector. The Higgs sector of the MSMHHC is based on the softly broken supersymmetric Nambu-Jona-Lasinio model with the four-held interaction of the Higgs doublets. At low energy, these two Higgs doublets condense into two neutral Higgs gauge singlets, and the low-energy effective Lagrangian of the MSMHHC has the form of the nonminimal supersymmetric standard model which contains two more Higgs singlets than the MSSM. Another unique feature of the MSMHHC it: that a heavy top quark always implies a strongly interacting low-energy Higgs sector, i.e., a large mass for the lightest Higgs boson. A systematic study of the parameter space is also made in order to reveal the qualitative features of the MSMHHC. Finally, we comment on the question of ''how large the lightest-Higgs-boson mass can be'' with the conclusion that the supersymmetric model of Higgs-Higgs condensation will be a very promising candidate if the lightest-Higgs-boson mass of the MSSM is excluded by future experiments. RP WU, YY (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 45 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1995 VL 52 IS 11 BP 6562 EP 6576 DI 10.1103/PhysRevD.52.6562 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TH212 UT WOS:A1995TH21200038 ER PT J AU Gravina, D Ciccotti, G Holian, BL AF Gravina, D Ciccotti, G Holian, BL TI Linear and nonlinear viscous flow in two-dimensional fluids SO PHYSICAL REVIEW E LA English DT Article ID MOLECULAR-DYNAMICS METHOD; 2 DIMENSIONS; TRANSPORT PROCESSES; CANONICAL ENSEMBLE; SHEAR VISCOSITY; DEPENDENCE AB We report on molecular dynamics simulations of shear viscosity eta of a dense two-dimensional fluid as a function of the shear rate gamma. We find an analytic dependence of eta on gamma, and do not find any evidence whatsoever of divergence in the Green-Kubo (GK) value that would be caused by the well-known longtime tail for the shear-stress autocorrelation function, as predicted by the mode-coupling theory. In accordance with the linear response theory, the GK value of eta agrees remarkably well with nonequilibrium values at small shear rates. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Gravina, D (reprint author), UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS,PIAZZALE ALDO MORO 2,I-00185 ROME,ITALY. NR 28 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1995 VL 52 IS 6 BP 6123 EP 6128 DI 10.1103/PhysRevE.52.6123 PN A PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK653 UT WOS:A1995TK65300055 ER PT J AU Collins, L Kwon, I Kress, J Troullier, N Lynch, D AF Collins, L Kwon, I Kress, J Troullier, N Lynch, D TI Quantum molecular dynamics simulations of hot, dense hydrogen SO PHYSICAL REVIEW E LA English DT Article ID LIQUID MODEL MIXTURES; JONES 12-6 POTENTIALS; ONE-COMPONENT PLASMA; STATISTICAL-MECHANICS; FUNCTIONAL THEORY; IONIZED MATTER; EQUILIBRIUM PROPERTIES; METALLIC HYDROGEN; SOLID HYDROGEN; HIGH-PRESSURE AB Quantum molecular dynamics simulations of pure samples and of mixtures of isotopic hydrogenic species (Ii, D, T) yield important structural, dynamical, and electronic properties that characterize matter at high compressions (rho greater than or equal to 0.25 g/cm(3)) and moderate temperatures (3000-60 000 K). Quantum mechanical treatments of the electrons, contained in periodically replicated reference cells of N-a atoms, by density functional and tight-binding methods determine the force on the nuclei and the electronic structure of the medium. The nuclei move according to the classical equations of motion in response to this quantal force. In addition, pair potentials based on Thomas-Fermi models (Moliere) extend both the temperature and density range of the more sophisticated models. Comparisons of the models are presented together with a comprehensive description of the techniques. Examples over a broad temperature and density range illustrate the basic physics for a hot, dense hydrogen medium. C1 UNIV MINNESOTA,MINNESOTA SUPERCOMP INST,MINNEAPOLIS,MN 55455. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. RP Collins, L (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 80 TC 80 Z9 80 U1 0 U2 3 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 DEC PY 1995 VL 52 IS 6 BP 6202 EP 6219 DI 10.1103/PhysRevE.52.6202 PN A PG 18 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK653 UT WOS:A1995TK65300064 ER PT J AU BARSHALOM, A OREG, J SEELY, JF FELDMAN, U BROWN, CM HAMMEL, BA LEE, RW BACK, CA AF BARSHALOM, A OREG, J SEELY, JF FELDMAN, U BROWN, CM HAMMEL, BA LEE, RW BACK, CA TI INTERPRETATION OF HOT AND DENSE ABSORPTION-SPECTRA OF A NEAR-LOCAL-THERMODYNAMIC-EQUILIBRIUM PLASMA BY THE SUPER-TRANSITION-ARRAY METHOD SO PHYSICAL REVIEW E LA English DT Article AB The super-transition-array model is shown to be a very convenient tool for the interpretation of near-local-thermodynamic-equilibrium hot and dense plasmas. Specifically, we interpret here the absorption spectra of the CH-Ni-CH foil experiment performed at Lawrence Livermore National Laboratory using the backlighter technique. In this experiment a laminar foil composed of 200-Angstrom Ni with 1000-Angstrom CH on both sides was radiatively heated by the x-ray continuum from a nearby gold plasma and was backlit by the x-ray continuum from a distant gold plasma that could be time delayed with respect to the heating pulse. This setup was designed to achieve a uniform density and heating of the Ni middle layer. It is found that the Ni absorption features depend very weakly on the density of the foil but are quite sensitive to the foil temperature. Remarkably good agreement between the theory and the experiment is obtained for the Ni 2p-3d spectrum. The detailed features indicate that the plasma temperature-is confined to a narrow range between 14 and 18 eV, demonstrating that the foil design, aiming to create a homogeneous Ni plasma, was successful. These results represent an alternative temperature diagnostic for high-Z plasma. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BARSHALOM, A (reprint author), NUCL RES CTR NEGEV,POB 9001,IL-84190 BEER SHEVA,ISRAEL. NR 10 TC 18 Z9 19 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 DEC PY 1995 VL 52 IS 6 BP 6686 EP 6691 DI 10.1103/PhysRevE.52.6686 PN B PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK655 UT WOS:A1995TK65500043 ER PT J AU BAUER, JD BACK, CA CASTOR, JI DYKEMA, PG HAMMEL, BA LEE, RW NASH, JK SEELY, JF FELDMAN, U BROWN, CM AF BAUER, JD BACK, CA CASTOR, JI DYKEMA, PG HAMMEL, BA LEE, RW NASH, JK SEELY, JF FELDMAN, U BROWN, CM TI SIMULATION AND ANALYSIS OF AN X-RAY-HEATED BORON-NITRIDE FOIL SO PHYSICAL REVIEW E LA English DT Article ID SPIN-INDUCED AUTOIONIZATION; RADIATIVE TRANSITION RATES; LITHIUMLIKE IONS; PLASMAS; SPECTRA; OPACITY; STATES; LINES; IRON; HOT AB We analyze an experiment performed at the Nova laser facility, at Lawrence Livermore National Laboratory, in which x rays, produced by a gold burn-through foil, heated an 1800-Angstrom boron-nitride (BN) foil. The BN foil was not hydrodynamically tamped and therefore provides an excellent example for testing our success at modeling systems with large density and temperature gradients. A time-integrated absorption spectrum was obtained. This spectrum reveals He-like and H-like boron features, He-like nitrogen features, as well as Li-Like satellites to the resonance Lines for both boron and nitrogen. The ALTAIR radiation hydrodynamics code and the TOTAL line-shape code were the basic instruments used in the analysis. Simulations address the temporal evolution of the temperature and density profiles as well as the ionization balance for the x-ray driven boron nitride foil. A synthesized spectrum is compared with the experimental absorption spectrum, and particular attention is given to the Li-Like satellite structure. The analysis of this seemingly simple experiment clearly reveals both current strengths and inadequacies in modeling hot dense matter. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BAUER, JD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 30 TC 5 Z9 5 U1 1 U2 4 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 DEC PY 1995 VL 52 IS 6 BP 6736 EP 6752 DI 10.1103/PhysRevE.52.6736 PN B PG 17 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK655 UT WOS:A1995TK65500047 ER PT J AU WOLPERT, DH WOLF, DR AF WOLPERT, DH WOLF, DR TI ESTIMATING FUNCTIONS OF PROBABILITY-DISTRIBUTIONS FROM A FINITE-SET OF SAMPLES SO PHYSICAL REVIEW E LA English DT Article ID MUTUAL INFORMATION; INFERENCE; ENTROPY AB This paper addresses the problem of estimating a function of a probability distribution from a finite set of samples of that distribution. A Bayesian analysis of this problem is presented, the optimal properties of the Bayes estimators are discussed, and as an example of the formalism, closed form expressions for the Bayes estimators for the moments of the Shannon entropy function are derived. Then numerical results are presented that compare the Bayes estimator to the frequency-counts estimator for the Shannon entropy. We also present the closed form estimators, all derived elsewhere, for the mutual information, chi(2) covariance, and some other statistics. C1 LOS ALAMOS NATL LAB, IMAGE ANAL SECT, LOS ALAMOS, NM 87545 USA. RP SANTA FE INST, 1399 HYDE PK RD, SANTA FE, NM 87501 USA. NR 33 TC 70 Z9 70 U1 0 U2 4 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 DEC PY 1995 VL 52 IS 6 BP 6841 EP 6854 DI 10.1103/PhysRevE.52.6841 PN B PG 14 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK655 UT WOS:A1995TK65500057 ER PT J AU LEMONS, DS LACKMAN, J JONES, ME WINSKE, D AF LEMONS, DS LACKMAN, J JONES, ME WINSKE, D TI NOISE-INDUCED INSTABILITY IN SELF-CONSISTENT MONTE-CARLO CALCULATIONS SO PHYSICAL REVIEW E LA English DT Article AB We identify, analyze, and propose remedies for a numerical instability responsible for the growth or decay of sums that should be conserved in Monte Carlo simulations of stochastically interacting particles. ''Noisy'' sums with fluctuations proportional to 1/root n, where n is the number of particles in the simulation, provide feedback that drives the instability. Numerical illustrations of an energy loss or ''cooling'' instability in an Ornstein-Uhlenbeck process support our analysis. C1 AMHERST COLL,DEPT PHYS,AMHERST,MA 01002. UNIV CALIF LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87544. RP LEMONS, DS (reprint author), BETHEL COLL,DEPT PHYS,N NEWTON,KS 67117, USA. NR 9 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1995 VL 52 IS 6 BP 6855 EP 6861 DI 10.1103/PhysRevE.52.6855 PN B PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK655 UT WOS:A1995TK65500058 ER PT J AU Cai, D Bishop, AR GronbechJensen, N AF Cai, D Bishop, AR GronbechJensen, N TI Spatially localized, temporally quasiperiodic, discrete nonlinear excitations SO PHYSICAL REVIEW E LA English DT Note ID MODES AB In contrast to the commonly discussed discrete breather, which is a spatially localized, time-periodic solution, we present an exact solution of a discrete nonlinear Schrodinger breather which is a spatially localized, temporally quasiperiodic nonlinear coherent excitation. This breather is a multiple-soliton solution in the sense of the inverse scattering transform. A discrete breather of multiple frequencies is conceptually important in studies of nonlinear lattice systems. We point out that, for this breather, the incommensurability of its frequencies is a discrete lattice effect and these frequencies become commensurate in the continuum limit. To understand the dynamical properties of the breather, we also discuss its stability and its behavior in the presence of an external potential. Finally, we indicate how to obtain an exact N-soliton breather as a discrete generalization of the continuum multiple-soliton solution. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP Cai, D (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 13 TC 30 Z9 30 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 DEC PY 1995 VL 52 IS 6 BP R5784 EP R5787 PN A PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK653 UT WOS:A1995TK65300016 ER PT J AU Chen, SY Cao, NZ AF Chen, SY Cao, NZ TI Inertial range scaling in turbulence SO PHYSICAL REVIEW E LA English DT Note ID BURGERS-EQUATION AB In this paper, we apply She and Leveque's [Z.-S. She and E. Leveque, Phys. Rev. Lett. 72, 336 (1994)] hierarchy model under the assumption that lim(p-->infinity)tau(p)/p=-1 with tau(p) being the scaling exponent for the local averaged dissipation function suggested by Novikov [E. A. Novikov, Phys. Rev. E 50, R3303 (1994)]. The resulting model agrees well with existing theoretical and experimental results for p less than or equal to 10. The most interesting prediction of this model is the saturation of the exponents of the velocity increment as p-->(infinity). C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP Chen, SY (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,POB 218,YORKTOWN HTS,NY 10598, USA. RI Chen, Shiyi/A-3234-2010 NR 15 TC 24 Z9 24 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 DEC PY 1995 VL 52 IS 6 BP R5757 EP R5759 PN A PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TK653 UT WOS:A1995TK65300009 ER PT J AU Xu, XJ Day, DE Brow, RK Callahan, PM AF Xu, XJ Day, DE Brow, RK Callahan, PM TI Structure of tin fluorophosphate glasses containing PbO or B2O3 SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Article ID RAMAN; FLUORINE AB Infrared, Raman and x-ray photoelectron spectroscopy were used to examine the structure of Sn-P-O-F containing PbO or B2O3 additives The infrared and Raman spectroscopic results for the SnF2-SnO-P2O5 glasses are consistent with the XPS results and support the structural model proposed in a previous report, i.e. with increasing the content of Sn2+ and/or F- ions the P-O-P network structure of glass depolymerised and Sn2+ acts as glass network former to enhance the glass formation tendency. The effects of PbO or B2O3 additions on the structure and properties of Sn-P-O-F glass are also studied. Evidence was found that P-F bonds were depleted with increasing PbO additions and the crosslinkage of glass structure was enhanced by the formation of P-O-B-O-P bonds in Sn-B-P-O-F glasses. The relationship between the glass structure and glass properties was also discussed based on the experimental results. C1 UNIV MISSOURI,DEPT CERAM ENGN,ROLLA,MO 65401. UNIV MISSOURI,GRAD CTR MAT RES,ROLLA,MO 65401. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV MISSOURI,DEPT CHEM,ROLLA,MO 65401. NR 26 TC 37 Z9 37 U1 0 U2 4 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD DEC PY 1995 VL 36 IS 6 BP 264 EP 271 PG 8 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA TV168 UT WOS:A1995TV16800006 ER PT J AU FINN, JM AF FINN, JM TI NEW PARALLEL VELOCITY SHEAR INSTABILITY SO PHYSICS OF PLASMAS LA English DT Article ID RESISTIVE TEARING MODES; TOKAMAK; FLOW; EQUILIBRIUM; PLASMAS AB Analytic and numerical results on the linear theory of a new instability driven by shear in the parallel velocity upsilon(parallel to)' will be presented. This instability exists in the presence of parallel velocity shear and field line curvature. It also requires either parallel viscosity - the full Braginskii stress tensor [S. I. Braginskii, in Reviews of Plasma Physics, edited by M. A. Leontovich (Consultants Bureau, New York, 1965), Vol. 1, p. 205]-or parallel compression. The mode exists in an electromagnetic version, where it can enhance the growth rate of an unstable resistive magnetohydrodynamic (MHD) mode or cause an otherwise stable resistive mode to grow. In its electromagnetic form it is global (matches to an ideal MHD outer region) and can influence modes responsible for disruptions; it can also lead to anomalous transport by stochastic field lines as well as by ExB advection. The instability also exists in an electrostatic form for short wavelengths. For most reasonable edge plasma parameters the effect of parallel compression dominates that of parallel viscosity. The properties of this mode, specifically its growth rate and localization width, are compared with those of the usual upsilon(parallel to)' mode [N. D'Angelo, Phys. Fluids 8, 1748 (1965)]. The importance of this mode in edge fluctuations and on more global resistive MHD is discussed. (C) 1995 American Institute of Physics. RP FINN, JM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-15,MS K717,LOS ALAMOS,NM 87545, USA. NR 28 TC 14 Z9 14 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1995 VL 2 IS 12 BP 4400 EP 4412 DI 10.1063/1.870996 PG 13 WC Physics, Fluids & Plasmas SC Physics GA TH680 UT WOS:A1995TH68000003 ER PT J AU TRACY, ER KAUFMAN, AN LIANG, YM AF TRACY, ER KAUFMAN, AN LIANG, YM TI WAVE EMISSION BY RESONANCE CROSSING SO PHYSICS OF PLASMAS LA English DT Article ID EVOLUTION AB The emission of collective waves by a moving charged particle in a, nonuniform medium is discussed. Emission occurs in a nonuniform medium when the local dispersion relation of the collective wave is satisfied. This is a form of resonance crossing. Using the Weyl symbol calculus, a local expansion of the collect wave equation driven by the particle source is derived in the neighborhood of the crossing. The collective wave dispersion manifold and the gyroballistic wave dispersion manifold can be used as a pair of local coordinates in the neighborhood of the resonance crossing, which greatly simplifies the analysis. This change of representation is carried out using a metaplectic transform (a generalization of the fourier transform). The Wigner function of the emitted wave field is then computed in;the new coordinates. The Wigner function is a phase space scalar, hence the numerical value is invariant under linear canonical transformations. This invariance is invoked to finally arrive at the Wigner function in the original (physical) coordinates. The wave-action and -energy emission rates are then computed from the Wigner function. (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP TRACY, ER (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185, USA. NR 8 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1995 VL 2 IS 12 BP 4413 EP 4419 DI 10.1063/1.870997 PG 7 WC Physics, Fluids & Plasmas SC Physics GA TH680 UT WOS:A1995TH68000004 ER PT J AU TESSAROTTO, M JOHNSON, JL ZHENG, LJ AF TESSAROTTO, M JOHNSON, JL ZHENG, LJ TI HAMILTONIAN APPROACH TO THE MAGNETOSTATIC EQUILIBRIUM PROBLEM SO PHYSICS OF PLASMAS LA English DT Article ID MAGNETIC-FIELD; STELLARATORS; TRANSPORT AB The purpose of this paper is to investigate the classical scalar-pressure magnetostatic equilibrium problem for nonsymmetric configurations in the framework of a Hamiltonian approach. Requiring that the equilibrium admits locally a family of nested toroidal magnetic surfaces, the Hamiltonian equations describing the magnetic flux lines in such a subdomain are obtained for a general canonical curvilinear coordinate system. The properties of such a coordinate system are investigated and a representation of the magnetic field is obtained. Its basic feature is that the magnetic field must fulfill suitable periodicity constraints to be imposed on arbitrary rational magnetic surfaces for general nonsymmetric toroidal equilibria, i.e., it is quasisymmetric. Implications for the existence of magnetostatic equilibria are pointed out. In particular, it is proven that a generalized equilibrium equation exists for such quasisymmetric equilibria, which extends the Grad-Shafranov equation to fully three-dimensional configurations. As an application, a representation is obtained for generalized helically symmetric equilibrium, extending the definition given by Nuhrenberg and Zille [Phys. Lett. A 129, 113 (1988)]. Since the new representation overcomes the inconsistency exhibited by the previous representation near the magnetic axis, pointed out by Garren and Boozer [Phys. Fluids B 3, 2805, 2822 (1991)], it appears potentially useful to interpret the numerical findings of quasihelical equilibria obtained so far. (C) 1995 American Institute of Physics. C1 PRINCETON UNIV, PLASMA PHYS LAB, PRINCETON, NJ 08543 USA. RP TESSAROTTO, M (reprint author), UNIV TRIESTE, DEPT MATH SCI, TRIESTE, ITALY. NR 32 TC 10 Z9 10 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1995 VL 2 IS 12 BP 4499 EP 4512 DI 10.1063/1.871008 PG 14 WC Physics, Fluids & Plasmas SC Physics GA TH680 UT WOS:A1995TH68000015 ER PT J AU WU, YL WHITE, RB CHEN, Y ROSENBLUTH, MN AF WU, YL WHITE, RB CHEN, Y ROSENBLUTH, MN TI NONLINEAR EVOLUTION OF THE ALPHA-PARTICLE-DRIVEN TOROIDICITY-INDUCED ALFVEN EIGENMODE SO PHYSICS OF PLASMAS LA English DT Article ID ENERGETIC INJECTED BEAM; SINGLE-MODE DRIVEN; WAVE PROBLEM; SATURATION; EXCITATION; SIMULATION; PLASMAS; TFTR AB A fast and efficient numerical algorithm using energy conservation is developed to study the interaction of high-energy particles with a toroidicity-induced Alfven eigenmode (TAE). A Hamiltonian guiding center code is used to simulate the alpha particle motion and a nonlinear delta f scheme is employed to calculate the wave-particle energy exchange. The code is benchmarked using the bump-on-tail problem and simulation results agree with analytical estimates. For a single TAE mode, the particle radial excursion is much less than the spacing between the resonances produced by the poloidal harmonics for International Thermonuclear Experimental Reactor parameters. Resonant particles that lose their energy to the wave can become trapped poloidally, but transfer to a loss orbit through this mechanism does not occur. Modification of the particle distribution leading to mode saturation is observed. (C) 1995 American Institute of Physics. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,SAN DIEGO,CA 92121. RP WU, YL (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 30 TC 26 Z9 26 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1995 VL 2 IS 12 BP 4555 EP 4562 DI 10.1063/1.871013 PG 8 WC Physics, Fluids & Plasmas SC Physics GA TH680 UT WOS:A1995TH68000021 ER PT J AU HOOPER, EB AF HOOPER, EB TI PLASMA-FLOW RESULTING FROM ELECTRON-CYCLOTRON-RESONANCE HEATING ON A MAGNETIC HILL SO PHYSICS OF PLASMAS LA English DT Article ID PARTICLE SIMULATION-MODEL; TRANSPORT AB The flow of low collisionality plasma down a magnetic hill during electron cyclotron resonance heating is analyzed using a particle-in-cell code that follows both the electron and ion guiding centers. The analysis is applied to the formation of an ion beam by plasma expansion in a magnetic nozzle, of-interest for plasma thrusters and other applications. The ambipolar electric potential that accelerates the ions is enhanced by effects of the magnetic forces on the electrons that are heated perpendicular to the magnetic field. Comparison with flow in the presence of isotropic heating demonstrates an increase in the efficiency of the particle and energy fluxes down the field relative to those that flow up the field to a wall at a large mirror ratio. The increases are reduced somewhat if particles recycle near the wall, but are still significant. RP HOOPER, EB (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 19 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1995 VL 2 IS 12 BP 4563 EP 4569 DI 10.1063/1.871014 PG 7 WC Physics, Fluids & Plasmas SC Physics GA TH680 UT WOS:A1995TH68000022 ER PT J AU HEDRICK, CL LEBOEUF, JN PROCHASKA, MD SPONG, DA CARRERAS, BA AF HEDRICK, CL LEBOEUF, JN PROCHASKA, MD SPONG, DA CARRERAS, BA TI ALTERNATE METHOD FOR TREATING ALFVEN WAVES DRIVEN UNSTABLE BY ALPHA-PARTICLES SO PHYSICS OF PLASMAS LA English DT Note ID IGNITED TOKAMAK; GYROFLUID MODEL; EXCITATION; DESTABILIZATION; EIGENMODE; PLASMA; IONS AB For treating Alfven waves driven unstable by a particles, an alternative to the Oak Ridge National Laboratory gyro-landau fluid approach is suggested. Its primary advantage is that this method can simultaneously treat fluid nonlinearities and kinetic quasilinear effects. It is argued that more perturbative approaches could overestimate the kinetic quasilinear effects. (C) 1995 American Institute of Physics. RP HEDRICK, CL (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 20 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1995 VL 2 IS 12 BP 4656 EP 4658 DI 10.1063/1.870957 PG 3 WC Physics, Fluids & Plasmas SC Physics GA TH680 UT WOS:A1995TH68000035 ER PT J AU JONES, CA LONGBOTTOM, AW HOLLERBACH, R AF JONES, CA LONGBOTTOM, AW HOLLERBACH, R TI A SELF-CONSISTENT CONVECTION DRIVEN GEODYNAMO MODEL, USING A MEAN-FIELD APPROXIMATION SO PHYSICS OF THE EARTH AND PLANETARY INTERIORS LA English DT Article ID ROTATING SPHERICAL-SHELL; NONLINEAR PLANETARY DYNAMOS; ALPHA-OMEGA-DYNAMOS; HYDROMAGNETIC DYNAMO; TAYLOR CONSTRAINT; SYMMETRICAL MODEL; MAGNETIC-FIELDS; INNER-CORE; GENERATION; STEADY AB The magnetic fields generated by thermal convection in a rapidly rotating fluid spherical shell are studied. The shell is sandwiched between a finitely conducting solid inner core and a non-conducting mantle. As the Rayleigh number is increased, the convective motion becomes stronger; when the magnetic Reynolds number becomes larger than a few hundred, dynamo action onsets, and a magnetic field with both axisymmetric and nonaxisymmetric components develops. The magnetic fields generated are generally of the same order of magnitude as the geomagnetic field, and the outer core fluid velocity is consistent with the values deduced from secular variation observations. A mean field approximation is used in which the dynamics of one non-axisymmetric convective mode (the m = 2 mode being most frequently used) and the associated axisymmetric components are followed. This scheme involves significantly less computation than a fully three-dimensional code, but does not require an arbitrary cu-effect to be imposed. Although the Roberts number, q, the ratio of thermal to magnetic diffusion, is small in the Earth, we find that dynamo action is most easily obtained at larger values of q. The Ekman number in our calculations has been taken in the range O(10(-3))-O(10(-4)), which, although small, is larger than the appropriate value for the Earth's core. At q = 10 we find solutions at Rayleigh numbers close to critical; two such runs are presented, one corresponding to a weak field dynamo, another to a strong field dynamo; the solution found depends on the initial conditions. At q = 1, the solutions have a complex spatial and temporal structure, with few persistent large-scale features, and our solutions reverse more frequently than the geodynamo. The final run presented has an imposed stable region near the core-mantle boundary. This solution has a weaker non-axisymmetric field, which fits better with the observed geomagnetic field than the solution without the stable layer. C1 LOS ALAMOS NATL LAB,IGPP,LOS ALAMOS,NM 87545. RP JONES, CA (reprint author), UNIV EXETER,DEPT MATH,EXETER EX4 4QE,DEVON,ENGLAND. OI Hollerbach, Rainer/0000-0001-8639-0967 NR 40 TC 69 Z9 69 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-9201 J9 PHYS EARTH PLANET IN JI Phys. Earth Planet. Inter. PD DEC PY 1995 VL 92 IS 3-4 BP 119 EP 141 DI 10.1016/0031-9201(95)03068-8 PG 23 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA TG818 UT WOS:A1995TG81800001 ER PT J AU DRELL, SD AF DRELL, SD TI DRELL CLARIFIES NUCLEAR STANCE SO PHYSICS TODAY LA English DT Letter RP DRELL, SD (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, 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 DEC PY 1995 VL 48 IS 12 BP 15 EP 15 DI 10.1063/1.2808284 PG 1 WC Physics, Multidisciplinary SC Physics GA TJ461 UT WOS:A1995TJ46100003 ER PT J AU WOOTEN, JW AF WOOTEN, JW TI WIGNER,EUGENE REMEMBERED SO PHYSICS TODAY LA English DT Letter RP WOOTEN, JW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1995 VL 48 IS 12 BP 15 EP & DI 10.1063/1.2808285 PG 0 WC Physics, Multidisciplinary SC Physics GA TJ461 UT WOS:A1995TJ46100004 ER PT J AU GLASS, G SIMMONS, JE KENEFICK, R MCINTYRE, JA AF GLASS, G SIMMONS, JE KENEFICK, R MCINTYRE, JA TI NORTHCLIFFE,LEE,C. - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual C1 TEXAS A&M UNIV,COLLEGE STN,TX. RP GLASS, G (reprint author), LOS ALAMOS NATL LAB,POB 1663,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 DEC PY 1995 VL 48 IS 12 BP 88 EP 88 DI 10.1063/1.2808312 PG 1 WC Physics, Multidisciplinary SC Physics GA TJ461 UT WOS:A1995TJ46100022 ER PT J AU ScottCraig, JS Kerby, KB Stein, BD Somerville, SC AF ScottCraig, JS Kerby, KB Stein, BD Somerville, SC TI Expression of an extracellular peroxidase that is induced in barley (Hordeum vulgare) by the powdery mildew pathogen (Erysiphe graminis f sp hordei) SO PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY LA English DT Article ID INDUCED PUTATIVE PEROXIDASE; TRITICUM-AESTIVUM L; PAPILLA FORMATION; SEQUENCE-ANALYSIS; MESSENGER-RNAS; CDNA CLONING; RESISTANCE; FRAGMENTS; PROTEINS; DISEASE AB The intercellular wash fluids (IWF) of barley seedlings contain at least six peroxidase isozymes. Two isozymes, P8.5 and P5.2, specifically increase in both resistant and susceptible barley following inoculation with the powdery mildew pathogen, Erysiphe graminis f. sp. hordei. A polyclonal antiserum to the cationic P8.5 isozyme was used to recover a clone for this peroxidase from a cDNA expression library made from inoculated barley seedlings. This cDNA was used as a probe to examine P8.5 mRNA levels from 0 to 48 h following inoculation of resistant barley with E. graminis hordei. Accumulation of the P8.5 polypeptide and total peroxidase activity in IWF was monitored over the same time course. These experiments show that enhanced levels of peroxidase activity are correlated with elevated levels of P8.5 polypeptide and mRNA in seedlings following inoculation with the powdery mildew pathogen. Finally, increased deposition of P8.5 was observed in papillae by immunogold labeling experiments. All the data are consistent with the hypothesis that peroxidase P8.5 participates in the deposition of phenolic compounds in papillae and thereby contributes to general, nonspecific defense responses in barley. (C) 1995 Academic Press Limited C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. NR 31 TC 45 Z9 51 U1 0 U2 5 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0885-5765 J9 PHYSIOL MOL PLANT P JI Physiol. Mol. Plant Pathol. PD DEC PY 1995 VL 47 IS 6 BP 407 EP 418 DI 10.1006/pmpp.1995.1068 PG 12 WC Plant Sciences SC Plant Sciences GA TK969 UT WOS:A1995TK96900005 ER PT J AU BENTON, CC MARCIAL, RA AF BENTON, CC MARCIAL, RA TI THE ENERGY-CONSERVATION FRONT + THE PACIFIC-GAS-AND-ELECTRIC-ENERGY-CENTER, SAN-FRANCISCO SO PLACES-A QUARTERLY JOURNAL OF ENVIRONMENTAL DESIGN LA English DT Article C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PACIFIC GAS & ELECT ENERGY CTR,SAN FRANCISCO,CA. RP BENTON, CC (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU DESIGN HISTORY FOUNDATION PI LAWRENCE PA C/O PLACES, PO BOX 1897, LAWRENCE, KS 66044-8897 SN 0731-0455 J9 PLACES-Q J ENVIRON D JI Places-Q. J. Environ. Design PD WIN PY 1995 VL 9 IS 3 BP 26 EP 27 PG 2 WC Architecture SC Architecture GA QE085 UT WOS:A1995QE08500005 ER PT J AU Walker, EL Weeden, NF Taylor, CB Green, P Coruzzi, GM AF Walker, EL Weeden, NF Taylor, CB Green, P Coruzzi, GM TI Molecular evolution of duplicate copies of genes encoding cytosolic glutamine synthetase in Pisum sativum SO PLANT MOLECULAR BIOLOGY LA English DT Article DE glutamine synthetase; gene duplication; multigene family; molecular evolution; gene conversion ID MESSENGER-RNA STABILITY; DIFFERENTIAL EXPRESSION; ARABIDOPSIS-THALIANA; CONCERTED EVOLUTION; NUCLEOTIDE-SEQUENCE; TRANSGENIC PLANTS; DNA; LEAVES; CHLOROPLAST; REGION AB Here, we describe two nearly identical expressed genes for cytosolic glutamine synthetase (GS3A and GS3B) in Pisum sativum L. RFLP mapping data indicates that the GS3A and GS3B genes are separate loci located on different chromosomes. DNA sequencing of the GS3A and GS3B genes revealed that the coding regions are 99% identical with only simple nucleotide substitutions resulting in three amino acid differences. Surprisingly, the non-coding regions (5' non-coding leader, the 11 introns, and 3' non-coding tail) all showed a high degree of identity (96%). In these non-coding regions, 25% of the observed differences between the GS3A and GS3B genes were deletions or duplications. The single difference in the 3' non-coding regions of the GS3A and GS3B genes was a 25 bp duplication of an AU-rich element in the GS3B gene. As the GS3B mRNA accumulates to lower levels than the GS3A gene, we tested whether this sequence which resembles an mRNA instability determinant functioned as such in the context of the GS mRNA. Using the GS3B 3' tail as part of a chimeric gene in transgenic plants, we showed that this AU-rich sequence has little effect on transgene mRNA levels. To determine whether the GS3A/GS3B genes represent a recent duplication, we examined GS3-like genes in gnomic DNA of ancient relatives of P. sativum. We observed that several members of the Viceae each contain two genomic DNA fragments homologous to the GS3B gene, suggesting that this is an ancient duplication event. Gene conversion has been invoked as a possible mechanism for maintaining the high level of nucleotide similarity found between the GS3A and GS3B genes. Possible evolutionary reasons for the maintenance of these 'twin' GS genes in pea, and the general duplication of genes for cytosolic GS in all plant species are discussed. C1 NYU,DEPT BIOL,NEW YORK,NY 10003. CORNELL UNIV,NEW YORK STATE AGR EXPT STN,DEPT HORT SCI,GENEVA,NY 14456. MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824. OI Walker, Elsbeth/0000-0003-4237-9920 FU NIGMS NIH HHS [GM32877] NR 49 TC 11 Z9 13 U1 0 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD DEC PY 1995 VL 29 IS 6 BP 1111 EP 1125 DI 10.1007/BF00020456 PG 15 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA TW193 UT WOS:A1995TW19300002 PM 8616212 ER PT J AU SALT, DE PRINCE, RC PICKERING, IJ RASKIN, I AF SALT, DE PRINCE, RC PICKERING, IJ RASKIN, I TI MECHANISMS OF CADMIUM MOBILITY AND ACCUMULATION IN INDIAN MUSTARD SO PLANT PHYSIOLOGY LA English DT Article ID ABSORPTION FINE-STRUCTURE; PLANTS; TRANSPORT; PEPTIDES AB Indian mustard (Brassica juncea L.), a high biomass crop plant, accumulated substantial amounts of cadmium, with bioaccumulation coefficients (concentration of Cd in dry plant tissue/concentration in solution) of up to 1100 in shoots and 6700 in roots at nonphytotoxic concentrations of Cd (0.1 mu g/mL) in solution. This was associated with a rapid accumulation of phytochelatins in the root, where the majority of the Cd was coordinated with sulfur ligands, probably as a Cd-S-4 complex, as demonstrated by x-ray absorption spectroscopy. In contrast, Cd moving in the xylem sap was coordinated predominantly with oxygen or nitrogen ligands. Cd concentrations in the xylem sap and the rate of Cd accumulation in the leaves displayed similar saturation kinetics, suggesting that the process of Cd transport from solution through the root and into the xylem is mediated by a saturable transport system(s). However, Cd translocation to the shoot appeared to be driven by transpiration, since ABA dramatically reduced Cd accumulation in leaves. Within leaves, Cd was preferentially accumulated in trichomes on the leaf surface, and this may be a possible detoxification mechanism. C1 EXXON RES & ENGN CO,ANNANDALE,NJ 08801. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP SALT, DE (reprint author), RUTGERS STATE UNIV,COOK COLL,CTR AGR & MOLEC BIOL,NEW BRUNSWICK,NJ 08903, USA. RI Salt, David/B-3864-2009; Pickering, Ingrid/A-4547-2013; OI Pickering, Ingrid/0000-0002-0936-2994 NR 29 TC 568 Z9 694 U1 2 U2 58 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD DEC PY 1995 VL 109 IS 4 BP 1427 EP 1433 PG 7 WC Plant Sciences SC Plant Sciences GA TK317 UT WOS:A1995TK31700037 ER PT J AU Diamond, H Cooke, BM Dunne, B AF Diamond, H Cooke, BM Dunne, B TI Information note: Microdochium leaf blotch of oats - A new foliar disease caused by Microdochium nivale var nivale in Ireland SO PLANT VARIETIES AND SEEDS LA English DT Article AB A leaf axil and sheath blotch of oats (Avena sativa L.) caused by Microdochium nivale var. nivale is described for the first time. Symptoms observed during the summer of 1994 an plants in a commercial Field appeared as triangular-shaped necrotic lesions with a downturning of the leaf blade. The identity of the causal agent was determined by morphological, molecular and pathogenicity tests. C1 TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. RP Diamond, H (reprint author), UNIV COLL DUBLIN,DEPT ENVIRONM RESOURCE MANAGEMENT,DUBLIN 4,IRELAND. NR 5 TC 8 Z9 8 U1 0 U2 0 PU NATL INST AGRICULTURAL BOTANY PI CAMBRIDGE PA HUNTINGDON RD, CAMBRIDGE, ENGLAND CB3 0LE SN 0952-3863 J9 PLANT VAR SEEDS JI Plant Var. Seeds PD DEC PY 1995 VL 8 IS 3 BP 171 EP 174 PG 4 WC Agronomy; Horticulture SC Agriculture GA TR146 UT WOS:A1995TR14600003 ER PT J AU PAIK, S HAWKES, G NGUYEN, HD AF PAIK, S HAWKES, G NGUYEN, HD TI EFFECT OF WORKING GASES ON THERMAL PLASMA WASTE TREATMENT SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE WASTE DESTRUCTION; ARC MELTER; PLASMA GASES; ANALYTICAL ID HEAT-TRANSFER; ARC; FLOW AB An electric are melter used for waste treatment processing is numerically studied. The effects of different plasma working gases are studied by using a laboratory scale test reactor. A two-dimensional finite difference approximation is used to solve the set of governing equations. The Navier-Stokes equations coupled with the combined Maxwell's equation for the electromagnetic fields is used to obtain the temperature and flow fields in the are melter. It is found that the energy efficiency of the air plasma is lower than that of an argon plasma. However, the melted soil volumes are larger using the air plasma than those using the argon plasma. The overall energy efficiency increases as the gap between the cathode and the soil surface decreases. More uniform gas temperatures are found for the air plasma than that for the argon plasma. Result obtained from the laboratory-scale are melter is used as an input of the energy absorbed into the soil for the USBM are melter simulation. Results show a maximum temperature of 2195 K at the center of the hear generation and a molten soil exit temperature of 1600 K. RP PAIK, S (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Hawkes, Grant/0000-0003-3496-8100 NR 19 TC 9 Z9 9 U1 0 U2 5 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 DEC PY 1995 VL 15 IS 4 BP 677 EP 692 DI 10.1007/BF01447066 PG 16 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA TC371 UT WOS:A1995TC37100005 ER PT J AU Maienschein, JL Nichols, AL Wardell, JF AF Maienschein, JL Nichols, AL Wardell, JF TI Reactions of TATB-based explosive with molten metal SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article AB The reactions of combustion products (CO, H2O) from the insensitive high explosive LX-17 (92.5 wt% 1,3,5-triamino-2,4,6-trinitrobenzene (TATE), 7.5 wt% Kel-F 800 binder) with molten metal (75 a% Nd, 25 a% Fe) were studied, to determine their contribution to the energy release rate of deflagrating LX-17. Kinetic data taken with gas mixtures of CO and H2O, and larger-scale tests with LX-17, showed that the reactions were slow and incomplete and that there was no significant contribution to the energy release rate. From the tests with LX-17, the effective flame temperature and burn velocity were dependent on confinement of gas products. LX-17 preheated to 500 K - 510 K showed effective flame temperatures of 1100 K - 1400 K and burn rates of 0.08-0.11 mm/s, depending on the extent of gas confinement by the molten metal. RP Maienschein, JL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 10 TC 1 Z9 1 U1 1 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD DEC PY 1995 VL 20 IS 6 BP 287 EP 293 DI 10.1002/prep.19950200602 PG 7 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA TV623 UT WOS:A1995TV62300001 ER PT J AU Vosen, SR Carling, RW Rychnovsky, RE Griffiths, SK Renzi, RF AF Vosen, SR Carling, RW Rychnovsky, RE Griffiths, SK Renzi, RF TI The effect of elastomeric liners on high-pressure liquid propellant combustion oscillations SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article AB Liquid propellants are currently being investigated as an alternative to solid propellants in advanced gun designs. The use of liquids may provide advantages in the areas of safety, cost and performance. One area of concern in liquid propellant gun designs is the presence of large pressure oscillations: oscillations of +/- 50 % of the baseline pressure have been observed. These oscillations may result in a degradation of performance and reliability. The source of pressure oscillations and possible mitigation schemes are being studied in the Sandia Liquid Propellant Injector/Combustor. In this research device, the effect of acoustic liners on pressure oscillations in a high-pressure (128 MPa) liquid propellant spray combustor is studied for a hydroxylammonium nitrate-based propellant. In this study we investigated the effects of orientation and coverage fraction of elastomer liners on pressure oscillation reduction. Results for a range of elastomer/steel liner combinations are presented, along with an acoustic model and a correlation the data. The results indicate that: (1) liners can reduce oscillations by approximately three orders of magnitude, (2) the reduction in pressure oscillation is independent of the placement of liners relative to the propellant flow, and (3) the magnitude of the oscillations can be correlated with the acoustic properties of the wall material. RP Vosen, SR (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 13 TC 3 Z9 3 U1 0 U2 2 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD DEC PY 1995 VL 20 IS 6 BP 311 EP 321 DI 10.1002/prep.19950200606 PG 11 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA TV623 UT WOS:A1995TV62300005 ER PT J AU BENNETT, MJ SCHLUNEGGER, MP EISENBERG, D AF BENNETT, MJ SCHLUNEGGER, MP EISENBERG, D TI 3D DOMAIN SWAPPING - A MECHANISM FOR OLIGOMER ASSEMBLY SO PROTEIN SCIENCE LA English DT Review DE AGGREGATION; COMPLEMENTATION; OLIGOMER EVOLUTION; PROTEIN DIMERIZATION ID BOVINE SEMINAL RIBONUCLEASE; X-RAY-ANALYSIS; CRYSTAL-STRUCTURE; HUMAN INTERLEUKIN-5; ESCHERICHIA-COLI; DIPHTHERIA-TOXIN; GAMMA-CRYSTALLIN; BETA-CRYSTALLIN; PROTEIN; RESOLUTION AB 3D domain swapping is a mechanism for forming oligomeric proteins from their monomers. In 3D domain swapping, one domain of a monomeric protein is replaced by the same domain from an identical protein chain. The result is an intertwined dimer or higher oligomer, with one domain of each subunit replaced by the identical domain from another subunit. The swapped ''domain'' can be as large as an entire tertiary globular domain, or as small as an a-helix or a strand of a P-sheet. Examples of 3D domain swapping are reviewed that suggest domain swapping can serve as a mechanism for functional interconversion between monomers and oligomers, and that domain swapping may serve as a mechanism for evolution of some oligomeric proteins. Domain-swapped proteins present examples of a single protein chain folding into two distinct structures. C1 UNIV CALIF LOS ANGELES,INST MOLEC BIOL,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90095. UNIV CALIF LOS ANGELES,UCLA DOE,STRUCT BIOL & MOLEC MED LAB,LOS ANGELES,CA 90095. UNIV PENN,DEPT BIOCHEM & BIOPHYS,PHILADELPHIA,PA 19104. FU NIGMS NIH HHS [GM 31299] NR 67 TC 561 Z9 566 U1 4 U2 25 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD DEC PY 1995 VL 4 IS 12 BP 2455 EP 2468 PG 14 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TH430 UT WOS:A1995TH43000002 PM 8580836 ER PT J AU Whitby, FG HuetePerez, J Luecke, H Wang, CC AF Whitby, FG HuetePerez, J Luecke, H Wang, CC TI Preliminary X-ray crystallographic analysis of Tritrichomonas foetus inosine-5'-monophosphate dehydrogenase SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article DE inosine monophosphate dehydrogenase; Tritrichomonas foetus; crystallization; X-ray diffraction; purine ID HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE; ESCHERICHIA-COLI; EXPRESSION AB Inosine-5'-monophosphate dehydrogenase (IMPDH) from the protozoan parasite Tritrichomonas foetus has been expressed in E, coli and crystallized. Crystals were grown to 0.1 mm in each dimension in 18 to 72 h using ammonium sulfate and low-molecular-weight polyethylene glycols. The crystals belong to the cubic space group P432 with unit cell edge = 157.25 Angstrom. The enzyme is a homotetramer with each monomer having a molecular weight of 55,534 Da, There is one monomer per asymmetric unit, based on a volume/mass ratio of 2.7 Angstrom(3)/Da and self-rotation analysis. The crystals are adequately stable to allow a complete data set to be collected from a single crystal. Complete native data sets have been collected to 2.3 Angstrom resolution at 4 degrees C using synchrotron radiation. High-quality complete data extending to 3.0 Angstrom resolution have been collected from crystals of four putative derivatives, and the data appear to be isomorphous with that of the native crystals in each case. Efforts to solve the derivatives for use in MIR phasing are underway. (C) 1995 Wiley-Liss, Inc. C1 UNIV CALIF SAN FRANCISCO, SCH PHARM, DEPT PHARMACEUT CHEM, SAN FRANCISCO, CA 94143 USA. STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA 94309 USA. RI Luecke, Hartmut "Hudel"/F-4712-2012 OI Luecke, Hartmut "Hudel"/0000-0002-4938-0775 FU NIAID NIH HHS [AI-19391] NR 18 TC 7 Z9 7 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0887-3585 EI 1097-0134 J9 PROTEINS JI Proteins PD DEC PY 1995 VL 23 IS 4 BP 598 EP 603 DI 10.1002/prot.340230417 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA TL844 UT WOS:A1995TL84400016 PM 8749858 ER PT J AU DESANTI, S DELEON, MJ CONVIT, A TARSHISH, C RUSINEK, H TSUI, WH SINAIKO, E WANG, GJ BARTLET, E VOLKOW, N AF DESANTI, S DELEON, MJ CONVIT, A TARSHISH, C RUSINEK, H TSUI, WH SINAIKO, E WANG, GJ BARTLET, E VOLKOW, N TI AGE-RELATED-CHANGES IN BRAIN .2. POSITRON EMISSION TOMOGRAPHY OF FRONTAL AND TEMPORAL-LOBE GLUCOSE-METABOLISM IN NORMAL SUBJECTS SO PSYCHIATRIC QUARTERLY LA English DT Article ID AGING HUMAN-BRAIN; ALZHEIMERS-DISEASE; PATTERNS; VOLUME AB While many neuropsychological studies have demonstrated age-related performance alterations in tests thought to reflect frontal and temporal lobe function, there is little direct observation and comparison of these hypothesized brain changes in vivo. The cerebral glucose metabolism of frontal, temporal, and cerebellar regions was examined in 40 young ((X) over bar = 27.5 +/- 4.9) and 31 elderly ((X) over bar = 67.6 +/- 8.8) normal males using PET-FDG. Univariate analysis showed age-related metabolic reductions in all frontal and temporal lobe regions. The reductions ranged from 13%-24% with the greatest changes in the frontal lobes. Multiple regression analyses showed a stronger age relationship with frontal lobe than with temporal lobe metabolism. The dorsal lateral frontal lobe was the region that appears to change most within the frontal lobes. Examination of the temporal lobe showed that age contributed equally to the metabolic variance of both the lateral temporal lobe and hippocampus. These results suggest that age-related metabolic changes exist in both frontal and temporal lobes and that the frontal lobe change is greater. C1 NATHAN S KLINE INST PSYCHIAT RES,ORANGEBURG,NY. BROOKHAVEN NATL LAB,UPTON,NY. RP DESANTI, S (reprint author), NYU,MED CTR,AGING & DEMENTIA RES CTR,NEUROIMAGING LAB,HN-314,560 1ST AVE,NEW YORK,NY 10016, USA. FU NIA NIH HHS [AG12101, P30 AG08051]; NIMH NIH HHS [MH43965] NR 24 TC 50 Z9 51 U1 0 U2 0 PU HUMAN SCI PRESS INC PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013-1578 SN 0033-2720 J9 PSYCHIAT QUART JI Psychiatr. Q. PD WIN PY 1995 VL 66 IS 4 BP 357 EP 370 PG 14 WC Psychiatry SC Psychiatry GA TF643 UT WOS:A1995TF64300007 PM 8584591 ER PT J AU Hsui, AT Yang, WS Baumgardner, JR AF Hsui, AT Yang, WS Baumgardner, JR TI A preliminary study of the effects of some flow parameters in the generation of poloidal and toroidal energies within a 3-D spherical thermal convective system with variable viscosity SO PURE AND APPLIED GEOPHYSICS LA English DT Article; Proceedings Paper CT IUTAM/IASPEI Symposium on Mechanics Problems in Geodynamics CY SEP 05-09, 1994 CL BEIJING, PEOPLES R CHINA SP IUTAM, IASPEI DE poloidal and toroidal energies; thermal convection; variable viscosity ID MANTLE CONVECTION; PLATE-TECTONICS; VENUS; SHELL; CORONAE; EVOLUTION; DYNAMICS; FEATURES; MODEL; FLUID AB The effects of variable viscosity on flow dynamics within spherical shells are investigated using a finite-element thermal convection model, and preliminary result for cases with relatively low Rayleigh numbers and small viscosity contrasts are reported. These results demonstrate some general effects of viscosity variation on mantle dynamics, and, in particular, the generation of toroidal energy. Since lateral viscosity variations are necessary in the generation of toroidal motion in a thermally driven convective system, it is not surprising our results show that flows with greater viscosity contrasts produce greater amounts df toroidal energy. Our preliminary study further shows that solutions become more time-dependent as viscosity contrasts increase. Increasing the Rayleigh number is also found to increase the magnitude of toroidal energy. Internal heating, on the other hand, appears to lead to less toroidal energy compared wth bottom heating because it tends to produce a thermally more uniform interior and thus smaller viscosity variations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP Hsui, AT (reprint author), UNIV ILLINOIS,DEPT GEOL,245 NHB,1301 W GREEN ST,URBANA,IL 61801, USA. NR 36 TC 3 Z9 3 U1 0 U2 0 PU BIRKHAUSER VERLAG AG PI BASEL PA PO BOX 133 KLOSTERBERG 23, CH-4010 BASEL, SWITZERLAND SN 0033-4553 J9 PURE APPL GEOPHYS JI Pure Appl. Geophys. PD DEC PY 1995 VL 145 IS 3-4 BP 487 EP 503 DI 10.1007/BF00879585 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA TT006 UT WOS:A1995TT00600006 ER PT J AU KOLANO, F AF KOLANO, F TI KICK OFF YOUR MEETINGS WITH FLAIR SO QUALITY PROGRESS LA English DT Editorial Material RP KOLANO, F (reprint author), US DOE,GRAND JUNCT PROJECT OFF,WASHINGTON,DC 20585, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC QUALITY CONTROL-ASQC PI MILWAUKEE PA ASQC MEMBERSHIP MANAGER 611 E. WISCONSIN AVENUE, MILWAUKEE, WI 53202 SN 0033-524X J9 QUAL PROG JI Qual. Prog. PD DEC PY 1995 VL 28 IS 12 BP 144 EP 144 PG 1 WC Engineering, Multidisciplinary; Engineering, Industrial; Management; Operations Research & Management Science SC Engineering; Business & Economics; Operations Research & Management Science GA TJ113 UT WOS:A1995TJ11300027 ER PT J AU CODERRE, JA MORRIS, GM MICCA, PL FISHER, CD ROSS, GA AF CODERRE, JA MORRIS, GM MICCA, PL FISHER, CD ROSS, GA TI COMPARATIVE-ASSESSMENT OF SINGLE-DOSE AND FRACTIONATED BORON NEUTRON-CAPTURE THERAPY SO RADIATION RESEARCH LA English DT Article ID RELATIVE BIOLOGICAL EFFECTIVENESS; RAT SPINAL-CORD; PARA-BORONOPHENYLALANINE; BRAIN-TUMORS; DAMAGE; GLIOSARCOMAS; IRRADIATION; TOLERANCE; MEVD->BE AB The effects of fractionating boron neutron capture therapy (BNCT) were evaluated in the intracerebral rat 9L gliosarcoma and rat spinal cord models using the Brookhaven Medical Research Reactor (BMRR) thermal neutron beam. The amino acid analog p-boronophenylalanine (BPA) was administered prior to each exposure to the thermal neutron beam, The total physical absorbed dose to the tumor during BNCT using BPA was 91% high-linear energy transfer (LET) radiation, Two tumor doses of 5.2 Gy spaced 48 h apart (n = 14) or three tumor doses of 5.2 Gy, each separated by 48 h (n = 10), produced 50 and 60% long-term (>1 year) survivors, respectively. The outcome of neither the two nor the three fractions of radiation was statistically different from that of the corresponding single-fraction group. In the rat spinal cord,the ED(50) for radiation myelopathy (as indicated by limb paralysis within 7 months) after exposure to the thermal beam alone was 13.6 +/- 0.4 Gy. Dividing the beam-only irradiation into two or four consecutive daily fractions increased the ED(50) to 14.7 +/- 0.2 Gy and 15.5 +/- 0.4 Gy, respectively, Thermal neutron irradiation in the presence of BPA resulted in an ED(50) for myelopathy of 13.8 +/- 0.6 Gy after a single fraction and 14.9 +/- 0.9 Gy after two fractions. An increase in the number of fractions to four resulted in an ED(50) of 14.3 +/- 0.6 Gy, The total physical absorbed dose to the blood in the vasculature of the spinal cord during BNCT using BPA was 80% high-LET radiation. It was observed that fractionation was of minor significance in the amelioration of damage to the normal central nervous system in the rat after boron neutron capture irradiation. (C) 1995 by Radiation Research Society C1 UNIV OXFORD, CHURCHILL HOSP,RES INST,CRC, NORMAL TISSUE RADIOBIOL RES GRP, OXFORD OX3 7LJ, ENGLAND. RP CODERRE, JA (reprint author), BROOKHAVEN NATL LAB, DEPT MED, UPTON, NY 11973 USA. NR 30 TC 21 Z9 21 U1 0 U2 0 PU RADIATION RESEARCH SOC PI LAWRENCE PA 810 E TENTH STREET, LAWRENCE, KS 66044 USA SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD DEC PY 1995 VL 144 IS 3 BP 310 EP 317 DI 10.2307/3578951 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA TH825 UT WOS:A1995TH82500009 PM 7494875 ER PT J AU CARDIS, E GILBERT, ES CARPENTER, L HOWE, G SALMON, L AF CARDIS, E GILBERT, ES CARPENTER, L HOWE, G SALMON, L TI EFFECTS OF LOW-DOSES AND LOW-DOSE RATES OF EXTERNAL IONIZING-RADIATION - RESPONSE SO RADIATION RESEARCH LA English DT Letter C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RADCLIFFE INFIRM, DEPT PUBL HLTH & PRIMARY CARE, OXFORD OX2 6HF, ENGLAND. COLUMBIA UNIV, DEPT EPIDEMIOL, NEW YORK, NY 10032 USA. AEA TECHNOL, RADIOL PROTECT RES DEPT, DIDCOT OX11 0RA, OXON, ENGLAND. RP CARDIS, E (reprint author), INT AGCY RES CANC, RADIAT & CANC PROGRAMME, 150 COURS ALBERT THOMAS, F-69372 LYON 08, FRANCE. RI Cardis, Elisabeth/C-3904-2017 NR 4 TC 2 Z9 2 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD DEC PY 1995 VL 144 IS 3 BP 347 EP 348 DI 10.2307/3578956 PG 2 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA TH825 UT WOS:A1995TH82500014 ER PT J AU DELAURENTIS, J AF DELAURENTIS, J TI APPEARANCE OF COMPLEX COMPONENTS IN A RANDOM BIGRAPH SO RANDOM STRUCTURES & ALGORITHMS LA English DT Article ID SPARSELY EDGED GRAPHS; NUMBER; CYCLES AB This is an investigation into the limiting distribution of the sparse connected components in an n(1) x n(2) bipartite multigraph with approximately 1/2n edges, where n(1), n(2) approximate to 1/2n. We will show that the probability of finding no complex components in a random n(1) x n(2) bigraph, with approximately tn edges, is asymptotically the same as for random graphs with n vertices and approximately 1/2n edges, namely root 2/3. In addition, we will show that, for n(1) x n(2) multi-bigraphs, the probability distribution for finitely many bicyclic components, tricyclic components, etc., with no components having more than a given number of cycles, asymptotically equals the corresponding distribution for random multigraphs with n vertices and approximately half as many edges. As an application of this analysis we present a method for estimating the efficiency of memory access in a distributed, replicated data base. (C) 1995 John Wiley & Sons, Inc. RP SANDIA NATL LABS, DEPT 1423, MS 1110, ALBUQUERQUE, NM 87185 USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 1042-9832 EI 1098-2418 J9 RANDOM STRUCT ALGOR JI Random Struct. Algorithms PD DEC PY 1995 VL 7 IS 4 BP 311 EP 335 DI 10.1002/rsa.3240070405 PG 25 WC Computer Science, Software Engineering; Mathematics, Applied; Mathematics SC Computer Science; Mathematics GA TF366 UT WOS:A1995TF36600004 ER PT J AU Li, W Coughlin, M Albright, RL Fish, RH AF Li, W Coughlin, M Albright, RL Fish, RH TI Polymer pendant ligand chemistry .4. Recovery of precious metal ions from strongly acidic solution with a polymer-supported o-phenylenediamine hydrochloride ligand SO REACTIVE & FUNCTIONAL POLYMERS LA English DT Article DE polymer pendant ligands; o-phenylenediamine hydrochloride; gold hydrochloride (AuCl4-) selectivity; anion-exchange mechanism; thiourea elution ID SEPARATION; EXTRACTION; COMPLEXES; EXCHANGE; PGM AB We report on the synthesis and reactivity of a polymer-supported o-phenylenediamine hydrochloride ligand, PS-PDHC, using macroporous 6% crosslinked polystyrene-divinylbenzene beads. The PS-PDHC ligand was found to be highly selective to AuCl4- ions in strongly acidic solutions in the presence of other precious metal ions, PdCl42-, PtCl42-, RhCl63-, and RuCl52- (selectivity values: 2.5, Au/Pd; 7.5, Au/Pt; 7, Au/Rh; 2.2, Au/Ru) as well as other transition metal ions, Fe3+, Cr3+, Cu2+, Ni2+, and Mn2+. The sorption capacity, selectivity, kinetics of removal and recovery, and solution isotherms have been determined for AuCl4- ions in competition with the above-mentioned metal ions. The relative ease of formation of the anionic complex in 0.5 M HCl, AuCl4-, was thought to be the primary reason for its selective ability to bind to the PS-PDHC ligand by an anion-exchange mechanism. Therefore, the effect of the HCl concentration on the kinetics of AuCl4- ion removal from solution was also investigated to clearly show that raising the pH from 0 to 5 caused a dramatic decrease in rate. The AuCl4- ion can be recovered quantitatively from the PS-PDHC beads using a 5% thiourea solution in 0.1 M HCl, allowing the polymer-supported ligand to be reused. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720. NR 22 TC 26 Z9 26 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-5148 J9 REACT FUNCT POLYM JI React. Funct. Polym. PD DEC PY 1995 VL 28 IS 1 BP 89 EP 96 DI 10.1016/1381-5148(95)00087-3 PG 8 WC Chemistry, Applied; Engineering, Chemical; Polymer Science SC Chemistry; Engineering; Polymer Science GA TT510 UT WOS:A1995TT51000011 ER PT J AU GARWIN, RL AF GARWIN, RL TI NUCLEAR TESTS ARE NO LONGER NECESSARY SO RECHERCHE LA French DT Article RP GARWIN, RL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU SOC ED SCIENTIFIQUES PI PARIS 06 PA 57 RUE DE SEINE, 75280 PARIS 06, FRANCE SN 0029-5671 J9 RECHERCHE JI Recherche PD DEC PY 1995 IS 282 BP 70 EP 76 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TH479 UT WOS:A1995TH47900026 ER PT J AU Kaiser, RI Suits, AG AF Kaiser, RI Suits, AG TI A high-intensity, pulsed supersonic carbon source with C(P-3(j)) kinetic energies of 0.08-0.7 eV for crossed beam experiments SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID RADIATION ENHANCED SUBLIMATION; ATOMS; SPECTROSCOPY; ABSORPTION; C3O2; IONS; H-2 AB An enhanced supersonic carbon source produces carbon atoms in their C(P-3(j)) electronic ground states via laser ablation of graphite at 266 nm. The 30 Hz (40+/-2) mJ output of a Nd-YAG laser is focused onto a rotating graphite rod with a 1000 mm focal length UV-grade fused silica piano-convex lens to a spot of (0.5+/-0.05) mm diameter. Ablated carbon atoms are subsequently seeded into helium or neon carrier gas yielding intensities up to 10(13) C atoms cm(-3) in the interaction region of a universal crossed beam apparatus. The greatly enhanced number density and duty cycle shift the limit of feasible crossed beam experiments down to rate constants as low as 10(-11)-10(-12) cm(3) s(-1). Carbon beam velocities between 3300 and 1100 m s(-1), with speed ratios ranging from 2.8 to 7.2, are continuously tunable on-line and in situ without changing carrier gases by varying the time delay between the laser pulse, the pulsed valve, and a chopper wheel located 40 mm after the laser ablation. Neither electronically excited carbon atoms nor ions could be detected within the error limits of a quadrupole-mass spectrometric detector. Carbon clusters are restricted to similar to 10% C-2 and C-3 in helium, minimized by multiphoton dissociation, and eliminating the postablation nozzle region. (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP Kaiser, RI (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 48 TC 59 Z9 59 U1 0 U2 5 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 DEC PY 1995 VL 66 IS 12 BP 5405 EP 5411 DI 10.1063/1.1146061 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TK573 UT WOS:A1995TK57300001 ER PT J AU Han, S Wagner, RS Joseph, J Plano, MA Moyer, MD AF Han, S Wagner, RS Joseph, J Plano, MA Moyer, MD TI Chemical vapor deposited diamond radiation detectors for ultrahigh radiation dose-rate measurements: Response to subnanosecond, 16-MeV electron pulses SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SYNTHETIC DIAMONDS AB Conductivity modulated devices, similar to photoconductors in operation, for use as radiation detectors were fabricated from polycrystalline chemical vapor deposited diamond films. These detectors were designed to operate under extremely high radiation fields with a large dynamic range in both response and speed. Two types of detectors were studied: a parallel-plate device and a surface device (SDT). The radiation used to excite these detectors was minimum ionizing electrons with an energy of 16 MeV and a nominal pulse width of less than 25 ps. The response time of all detectors was less than 45 ps. The sensitivity of the detectors was in the range 10(-5)-10(-6) A/W. Over the operating range of the detectors, signal saturation was not observed because to the signal size was small in comparison to the applied bias voltage. The detectors appeared to be linear with dose and dose rate over two orders of magnitude, and for dose rates up to 10(13) rad/s. Long-lived signal decay tails contributed to much less than 1% of the signal. The response of a SDT detector appeared to be independent of the orientation of the detector to the incident beam direction when the excitation source is minimum ionizing. It appears that the dose-rate linearity may be extended to a range greater than 10(13) rad/s. (C) 1995 American Institute of Physics. C1 CRYSTALLUME INC,SANTA CLARA,CA 95054. RP Han, S (reprint author), LOS ALAMOS NATL LAB,POB 1663,D429,LOS ALAMOS,NM 87545, USA. NR 18 TC 11 Z9 13 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 DEC PY 1995 VL 66 IS 12 BP 5516 EP 5521 DI 10.1063/1.1146077 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TK573 UT WOS:A1995TK57300020 ER PT J AU Goldston, JE Goldston, RJ AF Goldston, JE Goldston, RJ TI Optimal geometry for neutral-beam-based optical diagnostics in tokamaks SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB The key to obtaining good spatial resolution for neutral-beam-based optical diagnostics in tokamak plasmas is that the narrow optical sightline must cross the wide neutral beam path at a point where the sightline is tangent to the toroidal direction. For a single one-dimensional pinhole camera arrangement, this condition can be met at two points of interest in the plasma, such as the magnetic axis and the plasma edge. The camera location required to provide optimized spatial resolution is calculated. We find that the camera must be placed closer to the plasma edge as the neutral beam is aimed more tangentially. (C) 1995 American Institute of Physics. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1995 VL 66 IS 12 BP 5638 EP 5639 DI 10.1063/1.1146033 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TK573 UT WOS:A1995TK57300043 ER PT J AU Werner, TR Dobaczewski, J Nazarewicz, W AF Werner, TR Dobaczewski, J Nazarewicz, W TI Physics of drip-line nuclei SO REVISTA MEXICANA DE FISICA LA English DT Article; Proceedings Paper CT XVIII Symposium on Nuclear Physics CY JAN 04-07, 1995 CL OAXTEPEC, MEXICO SP Inst Mexicano Seguridad Social ID R-PROCESS AB The nature of exotic nuclei with extreme isospin values is analyzed within various models, with special emphasis on the role of coupling between bound states and the particle continuum. Applicability of the shell-correction method to nuclei far from the beta stability line is discussed. In particular, the sensitivity of predicted locations of one- and two-particle drip lines to details of the macroscopic-microscopic model is analyzed. Hartree-Fock and Hartree-Fock-Bogoliubov theories with different parametrizations are used to calculate the properties of exotic nuclei (masses, deformations, radii, and single-particle properties). The results are compared with available experimental data, and their dependence on the models used is discussed. C1 UNIV WARSAW, INST THEORET PHYS, PL-00681 WARSAW, POLAND. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. RP Werner, TR (reprint author), OAK RIDGE NATL LAB, DIV PHYS, POB 2008, OAK RIDGE, TN 37831 USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU SOC MEXICANA FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD DEC PY 1995 VL 41 SU 1 BP 1 EP 14 PG 14 WC Physics, Multidisciplinary SC Physics GA TL035 UT WOS:A1995TL03500002 ER PT J AU Wozniak, GJ Tso, K Phair, L Colonna, N Skulski, W Jing, K Moretto, LG AF Wozniak, GJ Tso, K Phair, L Colonna, N Skulski, W Jing, K Moretto, LG TI Experimental evidence for the reducibility of multifragment emission probabilities SO REVISTA MEXICANA DE FISICA LA English DT Article; Proceedings Paper CT XVIII Symposium on Nuclear Physics CY JAN 04-07, 1995 CL OAXTEPEC, MEXICO SP Inst Mexicano Seguridad Social ID HEAVY-ION COLLISIONS; FRAGMENT EMISSION; COMPOUND-NUCLEUS; TIME-SCALES; HOT NUCLEI; ENERGY; DYNAMICS; DECAY AB Multifragmentation has been studied for Ar-36-induced reactions on a Au-197 target at E/A = 80 and 110 MeV and for Xe-129-induced reactions on several targets (Cu-nat, Y-89, Ho-165, Au-197) at E/A = 40, 50 and 60 MeV. The probability of emitting n intermediate-mass-fragments is shown to be binomial at each transversal energy and reducible to an elementary binary probability p. For each target and at, each bombarding energy, this probability p shows a thermal nature by giving linear Arrhenius plots. For the Xe-129-induced reactions, a nearly universal linear Arrhenius plot is observed at each bombarding energy, indicating a large degree of target independence. C1 MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824. RP Wozniak, GJ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 30 TC 0 Z9 0 U1 0 U2 0 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD DEC PY 1995 VL 41 SU 1 BP 145 EP 158 PG 14 WC Physics, Multidisciplinary SC Physics GA TL035 UT WOS:A1995TL03500016 ER PT J AU Baldwin, E AF Baldwin, E TI Risk - Adams,J SO RISK ANALYSIS LA English DT Book Review RP Baldwin, E (reprint author), OAK RIDGE NATL LAB,OAK RIDGE NATL LAB,HLTH SCI RES DIV,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1995 VL 15 IS 6 BP 745 EP 746 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 TR490 UT WOS:A1995TR49000016 ER PT J AU Baldwin, E AF Baldwin, E TI Concepts of inhalation toxicology - McClellan,RO, Henderson,RF SO RISK ANALYSIS LA English DT Book Review RP Baldwin, E (reprint author), UNIV TENNESSEE,HLTH SCI RES DIV,OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1995 VL 15 IS 6 BP 745 EP 745 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 TR490 UT WOS:A1995TR49000015 ER PT J AU Baldwin, E AF Baldwin, E TI The common sense for a first course in statistics - Hutchinson,TP SO RISK ANALYSIS LA English DT Book Review RP Baldwin, E (reprint author), UNIV TENNESSEE,OAK RIDGE NATL LAB,HLTH SCI RES DIV,OAK RIDGE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1995 VL 15 IS 6 BP 746 EP 746 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 TR490 UT WOS:A1995TR49000017 ER PT J AU YOO, CS AKELLA, J CAMPBELL, AJ MAO, HK HEMLEY, RJ AF YOO, CS AKELLA, J CAMPBELL, AJ MAO, HK HEMLEY, RJ TI PHASE-DIAGRAM OF IRON BY IN-SITU X-RAY-DIFFRACTION - IMPLICATIONS FOR EARTH CORE SO SCIENCE LA English DT Article ID TEMPERATURES; PRESSURES; TRANSITIONS AB The phase diagram of iron has been studied to 130 gigapascals (1 gigapascal = 10(4) atmospheres) and 3500 kelvin by a combined laser-heated diamond-anvil cell and x-ray diffraction technique that provides direct identification of the solid phases. Iron in the hexagonal close-packed (hcp) phase (epsilon-Fe) is stable from 50 to at least 110 gigapascals at high temperatures. The wide stability field of epsilon-Fe indicates that this polymorph should currently be considered the most relevant solid phase for Earth's core. The triple point between the gamma, epsilon, and liquid phases is located at 2500 +/- 200 kelvin and 50 +/- 10 gigapascals, There is evidence for a phase with a double hcp structure below 40 gigapascals and for another transition above 110 gigapascals and 3000 kelvin. C1 CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. CARNEGIE INST WASHINGTON,CTR HIGH PRESSURE RES,WASHINGTON,DC 20015. RP YOO, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 23 TC 125 Z9 131 U1 2 U2 15 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD DEC 1 PY 1995 VL 270 IS 5241 BP 1473 EP 1475 DI 10.1126/science.270.5241.1473 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TH375 UT WOS:A1995TH37500031 ER PT J AU KELLY, DM FULLERTON, EE SANTAMARIA, J SCHULLER, IK AF KELLY, DM FULLERTON, EE SANTAMARIA, J SCHULLER, IK TI A SIMPLE CLOSED-FORM EXPRESSION FOR THE X-RAY REFLECTIVITY FROM MULTILAYERS WITH CUMULATIVE ROUGHNESS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT Acta Metallurgica Meeting on Novel Magnetic Structures and Properties CY JUN 24-25, 1994 CL SANTA FE, NM ID METALLIC MULTILAYERS; SUPERLATTICES; DIFFRACTION; DISORDER; GROWTH; FILMS AB We present a simple closed-form expression for the reflectivity from a multilayer which includes the effects of absorption, refraction, surface and substrate reflections but neglects dynamical effects. This expression reproduces the exact dynamical calculation except for the regions near the critical angle and for intense Bragg reflections. The expression is generalized to include cumulative interface roughness which follows a t(1/2) power-law growth. X-ray reflectivity is commonly used to study the interface structure and morphology of metallic superlattices.(1-7) The specular reflectivity is a measure of the average electron density profile of the superlattice and in principle can be used to determine the interdiffusion and average roughness of the interfaces. The most common approach to calculate the low angle profile is the recursive application of optical theories where the layers are assumed to be continuous media of constant electron density.(1-3) These theories are equivalent to dynamical calculations and include effects of multiple scattering, absorption, refraction, and surface and substrate reflections.(8) Although it is straight forward to calculate the reflectivity using this technique, the calculations are time consuming when the superlattice contains a large number of layers. In this paper, we present a simple closed-form expression for the reflectivity of a superlattice which includes the effects of absorption, refraction, and substrate reflections but neglects dynamical effects. The expression is then generalized to include cumulative interface roughness which follows a t(1/2) power-law growth. The kinematic calculation of the x-ray reflectivity from a general A/B superlattice is shown schematically in Fig. 1. The reflectivity of the superlattice is given by summing the reflectivity from each interface ignoring multiple reflections. The surface and substrate reflectivities are given by r(s) and r(sub), and the A-on-B and B-on-A reflectivities are given by r(AB) and r(BA) respectively. Each layer is characterized by a thickness t and index of refraction n given by:(1) (1) (n = 1 - rho(N)r(e) lambda(x)(2)/2 pi (f(0) + Delta f' + i Delta f '') C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. RP KELLY, DM (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS 0319,LA JOLLA,CA 92093, USA. RI Fullerton, Eric/H-8445-2013; Santamaria, Jacobo/N-8783-2016 OI Fullerton, Eric/0000-0002-4725-9509; Santamaria, Jacobo/0000-0003-4594-2686 NR 20 TC 31 Z9 31 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1995 VL 33 IS 10-11 BP 1603 EP 1608 DI 10.1016/0956-716X(95)00391-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TD758 UT WOS:A1995TD75800011 ER PT J AU FULLERTON, EE MATTSON, JE SOWERS, CH BADER, SD AF FULLERTON, EE MATTSON, JE SOWERS, CH BADER, SD TI INTERLAYER MAGNETIC COUPLING IN EPITAXIAL FE/CR(211) AND FE/CR(100) SUPERLATTICES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT Acta Metallurgica Meeting on Novel Magnetic Structures and Properties CY JUN 24-25, 1994 CL SANTA FE, NM ID BIQUADRATIC EXCHANGE; MULTILAYERS; MECHANISM; MAGNETORESISTANCE; RKKY AB We present magnetic characterization of epitaxial Fe/Cr(211) and Fe/Cr(100) superlattices grown simultaneously on MgO(110) and (100) substrates, respectively. At room temperature, the coupling for these two orientations oscillates in sign with the same period (18 Angstrom), phase and strength. These results indicate that the long-period oscillation is independent of the nested feature of the Cr Fermi-surface. We examine the temperature dependence of interlayer coupling and find a uniform AF bias develops in the (211) samples upon cooling and observe strongly temperature-dependent biquadratic coupling in the (100) samples. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 22 TC 7 Z9 7 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1995 VL 33 IS 10-11 BP 1637 EP 1642 DI 10.1016/0956-716X(95)00417-T PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TD758 UT WOS:A1995TD75800014 ER PT J AU HUTTEN, A BERNARDI, J FRIEDRICHS, S THOMAS, G BALCELLS, L AF HUTTEN, A BERNARDI, J FRIEDRICHS, S THOMAS, G BALCELLS, L TI MICROSTRUCTURAL INFLUENCE ON MAGNETIC-PROPERTIES AND GIANT MAGNETORESISTANCE OF MELT-SPUN GOLD-COBALT SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT Acta Metallurgica Meeting on Novel Magnetic Structures and Properties CY JUN 24-25, 1994 CL SANTA FE, NM ID CU-CO ALLOYS AB Microstructural influence on saturation magnetization, remanence, coercivity and giant magnetoresistance (GMR) of melt-spun Au-1-x-Co-x, (x = 0.65 and 0.284) ribbons in the as-quenched state and subsequently annealed at 480 degrees C has been investigated using analytical transmission electron microscopy. The evolution of the magnetic data with annealing time was found to be determined by the sequence of the formation of Co precipitates, their volume fraction, their particle size distribution and their morphology. GMR behavior was only measured for Au73.6Co28.4 and is clearly caused by a lamellar eutectic with a structure similar to multilayers. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV GOTTINGEN,INST MET PHYS,D-37073 GOTTINGEN,GERMANY. VIENNA TECH UNIV,INST APPL PHYS,A-1040 VIENNA,AUSTRIA. UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES,SAN DIEGO,CA 92093. RP HUTTEN, A (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. RI Hutten, Andreas/B-3524-2011; Balcells, Lluis/B-5027-2013 OI Balcells, Lluis/0000-0001-6603-7357 NR 28 TC 22 Z9 22 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1995 VL 33 IS 10-11 BP 1647 EP 1666 DI 10.1016/0956-716X(95)00401-G PG 20 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TD758 UT WOS:A1995TD75800016 ER PT J AU THANGARAJ, N KRISHNAN, KM FARROW, RFC AF THANGARAJ, N KRISHNAN, KM FARROW, RFC TI MICROSTRUCTURE AND GIANT MAGNETORESISTANCE IN GRANULAR AND MULTILAYER MAGNETIC THIN-FILMS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT Acta Metallurgica Meeting on Novel Magnetic Structures and Properties CY JUN 24-25, 1994 CL SANTA FE, NM ID CO/CU MULTILAYERS; CU; SUPERLATTICES; LAYERS AB The microstructure and magnetic properties of phase-separated (FeAg, CoAg) granular and multilayer Permalloy (Py)/Au magnetic thin films exhibiting giant magnetoresistance (GMR) havebeen investigated. Surprisingly, two Fe-Ag films of similar composition grown under identicalconditions and having substantially different microstructures yet display similar GMR. The microstructure of these films is characterized by Fe-rich or Go-rich regions respectively, 350-700 nm in extent and surrounded by a Ag-rich matrix. Within the Ag-rich regions, the Fe concentration varies from 20 to 25 atomic % and the Co concentration is similar to 16 at%. Within these regions essentially pure fee Co particles and bcc Fe particles are in parallel and rotated epitaxial alignment respectively with the fee Ag matrix. The Co and Fe particles are similar to 15 to 25 Angstrom in diameter. It is these small particles which account for the GMR exhibited by these alloys. This suggests that a size distribution of magnetic particles, sharply peaked at the optimum size with limited bulk segregation might give rise to larger GMR values. On the other hand, high resolution electron microscopy (HREM) analysis of as-grown permalloy(Py)/Au multilayers in (111) orientation revealed that the Au and Py layers have sharp interfaces with defects such as twin boundaries and misfit dislocations. The density of twin boundaries decreases from the Pt-seed layer to the top surface of the multilayer. An average of 1 twin boundary/195 nm(2) has been observed. On mild annealing, the twin density decreases and the multilayer interfaces become rough. The magnetoresistance of the as-grown Py/Au multilayer decreased from 11% to 8% on annealing at 250 degrees C for 40 minutes. From the measured roughness and total thickness of Au layers it was found that Au preferentially intermixes with Py, which reduces the magnitude of GMR. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP THANGARAJ, N (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 19 TC 10 Z9 10 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1995 VL 33 IS 10-11 BP 1667 EP 1677 DI 10.1016/0956-716X(95)00407-M PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TD758 UT WOS:A1995TD75800017 ER PT J AU LEWIS, LH ZHU, YM WELCH, DO AF LEWIS, LH ZHU, YM WELCH, DO TI FERROMAGNETIC GRAIN-BOUNDARY SIGNATURE IN DIE-UPSET RE-FE-B MAGNETS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT Acta Metallurgica Meeting on Novel Magnetic Structures and Properties CY JUN 24-25, 1994 CL SANTA FE, NM ID STRONG PINNING MODEL; PERMANENT-MAGNETS; NDFEB MAGNETS; MICROSTRUCTURE; COERCIVITY AB Previous nanostructural and nanocompositional studies performed on the boundaries of deformed grains in two die-upset rare earth magnets with bulk compositions Nd13.75Fe80.25B6 and Pr13.75Fe80.25B6 indicate that the intergranular phase in many grain boundaries is enriched in iron relative to the bulk. We present here preliminary magnetic data that provide further evidence that this grain boundary phase is indeed iron-rich, and in fact appears to be ferromagnetic. Hysteresis loops were performed at 800 K on die-upset magnets with the above compositions. Each sample showed a clear hysteresis with coercivities between 34 and 40 Oe and an average remanence 4 pi B-R of 6.8 G for the Nd-based sample and 10.3 G for the Pr-based sample. The ferromagnetic signals measured at high temperature in these magnets are attributed to the iron-rich grain boundary phase. The implications of this conclusion with respect to coercivity are discussed. RP LEWIS, LH (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV MAT SCI,UPTON,NY 11973, USA. NR 26 TC 9 Z9 9 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1995 VL 33 IS 10-11 BP 1775 EP 1780 DI 10.1016/0956-716X(95)00410-W PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TD758 UT WOS:A1995TD75800029 ER PT J AU BAILEY, KC AF BAILEY, KC TI RESPONDING TO THE THREAT OF BIOLOGICAL WEAPONS SO SECURITY DIALOGUE LA English DT Article RP BAILEY, KC (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 17 TC 5 Z9 5 U1 0 U2 0 PU SAGE PUBLICATIONS LTD PI LONDON PA 6 BONHILL STREET, LONDON, ENGLAND EC2A 4PU SN 0967-0106 J9 SECUR DIALOGUE JI Secur. Dialogue PD DEC PY 1995 VL 26 IS 4 BP 383 EP 397 DI 10.1177/0967010695026004004 PG 15 WC International Relations SC International Relations GA TH595 UT WOS:A1995TH59500004 ER PT J AU Babiuch, WM AF Babiuch, WM TI Public reactions to nuclear waste: Citizens' views on repository siting - Dunlap,R, Kraft,ME, Rosa,EA SO SOCIAL FORCES LA English DT Book Review RP Babiuch, WM (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV NORTH CAROLINA PRESS PI CHAPEL HILL PA BOX 2288, CHAPEL HILL, NC 27515-2288 SN 0037-7732 J9 SOC FORCES JI Soc. Forces PD DEC PY 1995 VL 74 IS 2 BP 740 EP 741 PG 2 WC Sociology SC Sociology GA TQ142 UT WOS:A1995TQ14200020 ER PT J AU Deb, SK AF Deb, SK TI Reminiscences on the discovery of electrochromic phenomena in transition metal oxides SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT 1st International Meeting on Electrochromism (IME-1) CY OCT 19-21, 1994 CL MURANO VENICE, ITALY SP CNR, Univ Trento, Elettrochim & Energia, Rome, Pilkington Technol, UK, Int Soc Electrochem, Italian Chem Soc, Electrochem Div, Univ Bologna, Italy, Univ Venice ID FILMS AB It has long been known that transition metal oxides of the types WO3, MoO3, TiO2, V2O5, etc., show considerable variation in stoichiometry, and that very often the nonstoichiometric compounds are characterized by strong coloration. This observation led to the fabrication of highly disordered thin films of some of these oxides-ones that showed strong coloration upon optical excitation. Back in the 1960s, there was considerable interest in optically bistable phenomena for high-density information recording, and these oxide films were investigated for that purpose. However, the difficulty encountered in the bleaching process led to the proposition that the optically induced color centers could be bleached by an electric field. Subsequent experiments clearly demonstrated that it was not only possible to form color centers by optical excitation and to bleach them by an electric field, but that it was possible to color and bleach by an electric field alone by simply reversing the polarity. This constituted the first successful demonstration of electrochromic phenomena in thin films of transition metal oxides. This was quickly followed by the development of various innovative device structures for practical application. In this paper, an attempt will be made to reminisce the discovery of the electrochromic phenomena in this type of material, ultimately leading to the current state of this technology. RP Deb, SK (reprint author), NREL,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 9 TC 50 Z9 51 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD DEC PY 1995 VL 39 IS 2-4 BP 191 EP 201 DI 10.1016/0927-0248(95)00055-0 PG 11 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA TW525 UT WOS:A1995TW52500009 ER PT J AU Benson, DK Branz, HM AF Benson, DK Branz, HM TI Design goals and challenges for a photovoltaic-powered electrochromic window covering SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT 1st International Meeting on Electrochromism (IME-1) CY OCT 19-21, 1994 CL MURANO VENICE, ITALY SP CNR, Univ Trento, Elettrochim & Energia, Rome, Pilkington Technol, UK, Int Soc Electrochem, Italian Chem Soc, Electrochem Div, Univ Bologna, Italy, Univ Venice AB As the technical issues of performance and durability of electrochromic (EC) windows near resolution, more attention is being focused upon the economics of ''smart'' window fabrication, installation and operation. A retrofit EC window covering that could be readily applied to existing windows could have several economical advantages, particularly if it were photovoltaic (PV)-powered. Such a window covering could be produced on a flexible polymer substrate that would be adhered to the inside surface of a window. It could be conveniently replaced as newer, better coverings were developed and would not have to have as long a proven service lifetime as would a permanent window coating. A PV-EC window covering could also obviate the need for expensive electrical wiring for power and controls. Along with the advantages of a self-powered ''smart'' window covering come disadvantages and new technological challenges. In this paper, we will describe the design options and challenges associated with this retrofit concept which are presently being studied at NREL. RP Benson, DK (reprint author), NATL RENEWABLE ENERGY LAB,DIV BASIC SCI,GOLDEN,CO, USA. NR 6 TC 29 Z9 31 U1 1 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD DEC PY 1995 VL 39 IS 2-4 BP 203 EP 211 DI 10.1016/0927-0248(95)00041-0 PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA TW525 UT WOS:A1995TW52500010 ER PT J AU Ozer, N Lampert, CM AF Ozer, N Lampert, CM TI Electrochemical lithium insertion in sol-gel deposited LiNbO3 films SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT 1st International Meeting on Electrochromism (IME-1) CY OCT 19-21, 1994 CL MURANO VENICE, ITALY SP CNR, Univ Trento, Elettrochim & Energia, Rome, Pilkington Technol, UK, Int Soc Electrochem, Italian Chem Soc, Electrochem Div, Univ Bologna, Italy, Univ Venice ID THIN-FILMS; GROWTH AB Inorganic LiNbO3 ion conducting films were prepared by sol-gel process involving two alkoxides, lithium ethoxide and niobium ethoxide. The films were analyzed by ellipsometry, X-ray diffractometry, scanning electron microscopy and impedance spectroscopy. Impedance spectroscopy indicated that the Li+ conductivity values were in the range of 6-8 x 10(-7) S cm(-1). The morphology and thickness of these films played an important role in the insertion of lithium ions. Spectrophotometric investigation showed that LiNbO3 films exhibit very weak cathodic coloration from 350 to 900 nm spectral region. The electrochemical and optical properties clearly indicate that sol-gel deposited LiNbO3 films can be used as lithium ion conducting layers for electrochromic device application. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BLDG TECHNOL PROGRAM,BERKELEY,CA 94720. ISTANBUL TECH UNIV,DEPT PHYS,ISTANBUL,TURKEY. NR 16 TC 17 Z9 18 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD DEC PY 1995 VL 39 IS 2-4 BP 367 EP 375 DI 10.1016/0927-0248(96)80002-X PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA TW525 UT WOS:A1995TW52500024 ER PT J AU SHUL, RJ SULLIVAN, CT SNIPES, MB MCCLELLAN, GB HAFICH, M FULLER, CT CONSTANTINE, C LEE, JW PEARTON, SJ AF SHUL, RJ SULLIVAN, CT SNIPES, MB MCCLELLAN, GB HAFICH, M FULLER, CT CONSTANTINE, C LEE, JW PEARTON, SJ TI ATTENTUATION LOSSES IN ELECTRON-CYCLOTRON-RESONANCE PLASMA-ETCHED ALGAAS WAVE-GUIDES SO SOLID-STATE ELECTRONICS LA English DT Article ID III-V SEMICONDUCTORS; DISCHARGES AB AlGaAs/GaAs ridge waveguides with fundamental mode attenuation less than or equal to 1 dB cm(-1) at a wavelength of 1.32 mu m and channel widths of 4-4.5 mu m are realized by ECR (Electron Cyclotron Resonance) plasma etching in BCl3/Cl-2/Ar/N-2 chemistries. The choice of both plasma chemistry and initial mask scheme (single layer photoresist or trilevel resist) has a significant effect on the attenuation losses. C1 PHARMA THERM IP,ST PETERSBURG,FL 33716. UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. RP SHUL, RJ (reprint author), SANDIA NATL LABS,DIV 1322,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 17 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD DEC PY 1995 VL 38 IS 12 BP 2047 EP 2049 DI 10.1016/0038-1101(95)00034-Q PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA TC645 UT WOS:A1995TC64500011 ER PT J AU SLEEFE, GE WARPINSKI, NR ENGLER, BP AF SLEEFE, GE WARPINSKI, NR ENGLER, BP TI THE USE OF BROAD-BAND MICROSEISMS FOR HYDRAULIC-FRACTURE MAPPING SO SPE FORMATION EVALUATION LA English DT Article AB We conducted a series of hydraulic-fracture experiments to examine improvements in seismic-fracture diagnostic technology that are available with the application of advanced receiver capabilities. We present characteristics of the microseisms, tool response behavior, and the results of the tests. RP SLEEFE, GE (reprint author), SANDIA NATL LABS,TECH STAFF,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SOC PETROLEUM ENG PI RICHARDSON PA 222 PALISADES CREEK DR, RICHARDSON, TX 75080 SN 0885-923X J9 SPE FORMATION EVAL JI SPE Form. Eval. PD DEC PY 1995 VL 10 IS 4 BP 233 EP 239 PG 7 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA TJ491 UT WOS:A1995TJ49100005 ER PT J AU Garrett, AW Hemberger, PH Nogar, NS AF Garrett, AW Hemberger, PH Nogar, NS TI Selective ionization for elemental analysis with an ion trap mass spectrometer SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article DE ionization efficiency; ion trap mass spectrometer; resonant laser ablation; selectivity ID RESONANT LASER ABLATION; DESORPTION; SENSITIVITY; SAMPLES; GAAS AB The ion storage capacity (<10(6)) of ion trap mass spectrometers (ITMS) can sometimes limit the ability to analyze trace components in complex mixtures. We demonstrate here that resonant laser ablation (RLA) can offer a degree of selectivity in the ionization process, thus allowing the preferential accumulation of analyte ions in the trap. Selectivities of 75 and 50, for chromium and iron, respectively, are reported here for RLA of stainless steel in an ITMS. We offer suggestions to improve both the selectivity and the ionization efficiency, relative to the results reported here. C1 LOS ALAMOS NATL LAB,CHEM SCI & TECHNOL DIV,LOS ALAMOS,NM 87545. NR 30 TC 10 Z9 10 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD DEC PY 1995 VL 50 IS 14 BP 1889 EP 1895 DI 10.1016/0584-8547(95)01382-2 PG 7 WC Spectroscopy SC Spectroscopy GA TR727 UT WOS:A1995TR72700011 ER PT J AU Erdemir, A Bindal, C AF Erdemir, A Bindal, C TI Formation and self-lubricating mechanisms of boric acid on borided steel surfaces SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 25-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE solid lubrication; boriding; friction and wear; boric acid ID TRIBOLOGICAL PROPERTIES; FORMING SURFACES; WEAR AB In this study, we investigated the formation and self-lubricating mechanisms of thin boron oxide and boric acid films on the surfaces of borided steel substrates. Specifically, we developed an annealing procedure which resulted in the formation of a glasslike boron oxide layer on borided steel surfaces. Annealing was performed at 750 degrees C for 5 min. During cooling, the boron oxide layer reacted with moisture in the surrounding atmosphere to form a thin boric acid film. The measured friction coefficients of sapphire and 440C steel balls against the unborided and borided sides ranged from 0.4 to 0.6. However, after short-duration annealing at 750 degrees C, the friction coefficients of borided steel surfaces were about 0.05 at steady state. Crystal chemical knowledge and Raman spectroscopy evidence were used to determine the formation and self-lubricating mechanisms of the thin boron oxide and boric acid films on borided surfaces. C1 SAKARYA UNIV, DEPT MET ENGN, ADAPAZARI, TURKEY. RP Erdemir, A (reprint author), ARGONNE NATL LAB, TRIBOL SECT, DIV ENERGY TECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 18 TC 33 Z9 34 U1 1 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC PY 1995 VL 76-77 IS 1-3 BP 443 EP 449 PN 2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA TM180 UT WOS:A1995TM18000010 ER PT J AU Erdemir, A Bindal, C Pagan, J Wilbur, P AF Erdemir, A Bindal, C Pagan, J Wilbur, P TI Characterization of transfer layers on steel surfaces sliding against diamond-like hydrocarbon films in dry nitrogen SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 25-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE diamond-like carbon; friction and wear; transfer layers; Raman spectroscopy ID AMORPHOUS-CARBON; WEAR AB Carbon-rich transfer layers on sliding contact surfaces play important roles in the tribological performance of diamond-like hydrocarbon (DLHC) films. In this study, we investigated the nature of these layers formed on M50 balls during sliding against DLHC films (1.5 mu m thick) prepared by ion-beam deposition. Long-duration sliding tests were performed with steel balls sliding against the DLHC coatings in dry nitrogen at room temperature, approximately 22 +/- 1 degrees C. Results indicated that the friction coefficients of test pairs were initially about 0.12 but decreased steadily with sliding distance to 0.02-0.03 and remained constant throughout the tests, which lasted for more than 250000 sliding cycles (approximately 30 km). This low-friction regime appeared to coincide with the formation of a carbon-rich transfer layer on the sliding surfaces of M50 balls. Micro-laser Raman spectroscopy and electron microscopy were used to elucidate the structure and chemistry of these transfer layers and to reveal their possible role in the wear and friction behavior of DLHC-coated surfaces. C1 COLORADO STATE UNIV, DEPT MECH ENGN, FT COLLINS, CO 80523 USA. SAKARYA UNIV, DEPT MET ENGN, ADAPAARI, TURKEY. UNIV MICHIGAN, DEPT MECH ENGN, ANN ARBOR, MI 48107 USA. RP Erdemir, A (reprint author), ARGONNE NATL LAB, DIV ENERGY TECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 20 TC 114 Z9 115 U1 0 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC PY 1995 VL 76-77 IS 1-3 BP 559 EP 563 DI 10.1016/0257-8972(95)02518-9 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA TM180 UT WOS:A1995TM18000028 ER PT J AU Berzins, LV Anklam, TM Chambers, F Galanti, S Haynam, CA Worden, EF AF Berzins, LV Anklam, TM Chambers, F Galanti, S Haynam, CA Worden, EF TI Diode laser absorption spectroscopy for process control - Sensor system design methodology SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 25-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE process control; laser absorption spectroscopy AB A laser absorption spectroscopy (LAS)system has been developed at Lawrence Livermore National Laboratory for process control. LAS has proven itself to be an accurate and reliable method to monitor both density and composition. In this paper the important features and components of an industrial LAS diagnostic are described. Application of this approach to vaporization processes requires careful selection of the species and transitions to be monitored. The relative vapor pressure, hyperfine structure, isotopic frequency shifts, and electronic temperature all effect the selection of a particular transition. In this paper we describe the methodology for choosing the optimal transition or transitions. Coevaporation of a titanium-niobium alloy is used to illustrate the methodology. In a related paper, T.M. Anklam et al.,'Evaporation rate and composition monitoring of electron beam PVD processes' (Surface and Coatings Technology, 76/77 (1995) 681-686), describe the application of this diagnostic to monitoring and controlling composition in a physical vapor deposition process of industrial interest. RP Berzins, LV (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, L-470, LIVERMORE, CA 94550 USA. NR 8 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC PY 1995 VL 76-77 IS 1-3 BP 675 EP 680 DI 10.1016/0257-8972(96)80005-3 PN 2 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA TM180 UT WOS:A1995TM18000045 ER PT J AU Anklam, TM Berzins, LV Braun, DG Haynam, C Meier, T McClelland, MA AF Anklam, TM Berzins, LV Braun, DG Haynam, C Meier, T McClelland, MA TI Evaporation rate and composition monitoring of electron beam physical vapor deposition processes SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 25-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE vapor; monitoring; composition; laser; spectroscopy AB Lawrence Livermore National Laboratory (LLNL) is developing sensor and control technology to improve the quality and range of applicability of electron beam physical vapor deposition (PVD). The approach being developed uses tunable lasers to measure the density and composition of the vapor plume. This paper reviews the principles of operation of laser based sensors and discusses data from experiments in which titanium and niobium are co-vaporized. Laser data agreed well with deposited film compositions and spatial variations in deposited film cross-sections. Laser based vapor monitoring appears to have broad applicability and has the potential to extend the use of high rate electron beam PVD. RP Anklam, TM (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, L-460, LIVERMORE, CA 94550 USA. NR 3 TC 6 Z9 6 U1 1 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC PY 1995 VL 76-77 IS 1-3 BP 681 EP 686 DI 10.1016/0257-8972(96)80006-5 PN 2 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA TM180 UT WOS:A1995TM18000046 ER PT J AU DIEBOLD, U SHINN, ND AF DIEBOLD, U SHINN, ND TI ADSORPTION AND THERMAL-STABILITY OF MN ON TIO2(110) - 2P X-RAY-ABSORPTION SPECTROSCOPY AND SOFT-X-RAY PHOTOEMISSION SO SURFACE SCIENCE LA English DT Article DE GROWTH; LOW INDEX SINGLE CRYSTAL SURFACES; MANGANESE; METAL-INSULATOR INTERFACES; PHOTOEMISSION; SINGLE CRYSTAL EPITAXY; SOFT X-RAY PHOTOELECTRON SPECTROSCOPY; TITANIUM OXIDE; X-RAY ABSORPTION SPECTROSCOPY ID ELECTRON-ENERGY-LOSS; TRANSITION-METALS; OXIDES; REACTIVITY; SURFACES; SPECTRA; GROWTH; FILMS AB X-ray absorption and photoelectron spectroscopies are used to study the adsorption and reaction of Mn films deposited on TiO2(110) at 25 degrees C and after annealing to similar to 650 degrees C. Fractional monolayer coverages of Mn at 25 degrees C produce a reactive, disordered interface consisting of reduced Ti cations and oxidized Mn overlayer atoms. Metallic Mn is found only for thicker layers at 25 degrees C. Annealing Mn films to -650 degrees C leads to several changes that are largely independent of initial overlayer coverage: Metallic Mn thermally desorbs leaving only Mn2+ ions; interfacial Ti cations are largely re-oxidized to the Ti4+ state; and the local order is increased at the interface. The formation of a crystalline ternary surface oxide, MnTiOx, is proposed to account for these chemical and structural changes. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87518 USA. RP TULANE UNIV, DEPT PHYS, NEW ORLEANS, LA 70118 USA. RI Diebold, Ulrike/A-3681-2010 OI Diebold, Ulrike/0000-0003-0319-5256 NR 38 TC 17 Z9 17 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD DEC 1 PY 1995 VL 343 IS 1-2 BP 53 EP 60 DI 10.1016/0039-6028(95)00780-6 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA TK128 UT WOS:A1995TK12800011 ER PT J AU HENDERSON, MA AF HENDERSON, MA TI MECHANISM FOR THE BULK-ASSISTED REOXIDATION OF ION SPUTTERED TIO2 SURFACES - DIFFUSION OF OXYGEN TO THE SURFACE OR TITANIUM TO THE BULK SO SURFACE SCIENCE LA English DT Letter DE ION BOMBARDMENT; OXIDATION; SECONDARY ION MASS SPECTROSCOPY; SINGLE CRYSTAL SURFACES; SURFACE SEGREGATION; TITANIUM DIOXIDE ID ENERGY-ELECTRON-DIFFRACTION; SINGLE-CRYSTAL SURFACES; TIO2(110); DEFECTS; BOMBARDMENT; TIO2(001); PHOTOEMISSION; RUTILE; SPECTROSCOPY; REACTIVITY AB The reoxidation of Ar+ sputtered TiO2 surfaces by thermal annealing in vacuum is shown to result primarily from the diffusion of titanium cations, presumably in reduced oxidation states, from the damaged surface into the bulk, and not from the diffusion of bulk oxygen anions to the surface. Temperature programmed static secondary ion mass spectrometry (SSIMS) measurements indicate that the ratios of O to Ti in the Ar+ sputtered surfaces of TiO2(110) and TiO2(100) increase significantly as the temperature exceeds 700 K. With oxygen-18 incorporated into the Ar+ sputtered surfaces, the ratios of O-16 to O-18 remain constant during this reoxidation process. However, for both surfaces, the ratios of O-16 to Ti and O-18 to Ti increase during the reoxidation process. These ratios increase primarily as a result of a decrease in the surface Ti concentration which is ascribed to the diffusion of reduced Ti cations into the bulk of the oxide. RP HENDERSON, MA (reprint author), BPACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, MAT & INTERFACES GRP,POB 999, MS K2-12, RICHLAND, WA 99352 USA. NR 44 TC 77 Z9 77 U1 2 U2 21 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD DEC 1 PY 1995 VL 343 IS 1-2 BP L1156 EP L1160 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA TK128 UT WOS:A1995TK12800002 ER PT J AU JOSSART, GH GREULICH, KM SIPERSTEIN, AE DUH, Q CLARK, OH WEIER, HUG AF JOSSART, GH GREULICH, KM SIPERSTEIN, AE DUH, Q CLARK, OH WEIER, HUG TI MOLECULAR AND CYTOGENETIC CHARACTERIZATION OF A T(1-10-21) TRANSLOCATION IN THE HUMAN PAPILLARY THYROID-CANCER CELL-LINE TPC-1 EXPRESSING THE RET/H4 CHIMERIC TRANSCRIPT SO SURGERY LA English DT Article; Proceedings Paper CT 16th Annual Meeting of the American-Association-of-Endocrine-Surgeons CY APR 23-25, 1995 CL PHILADELPHIA, PA SP Amer Assoc Endocrine Surgeons ID INSITU HYBRIDIZATION; PTC; ALPHA; GENE AB Background. Activation of the ret proto-oncogene by three different chromosomal rearrangements occurs in up to 25% of papillary thyroid carcinomas. We developed a rapid screening technique to detect ret rearrangements in human interphase and metaphase cells on the basis of multicolor fluorescence in situ hybridization (FISH) of locus-specific DNA probes. Methods. DNA from individual clones representing the respective ends of a yeast artificial chromosome (YAC) contig spanning the entire ret gene locus were labeled with either digoxigenin (visualized in red) or biotin (green) and hybridized to normal human lymphocytes and the papillary thyroid cancer cell line TPC-1 expressing the ret/H4 chimeric transcript. Further detailed analysis was performed with whole chromosome painting probes and locus-specific probes (YACs, P1s, DNA repeat probes) on tumor metaphase spreads. Results. Hybridization of the YACs to unrearranged ret loci in normal human lymphocyte interphase nuclei showed two yellow domains because of probe overlap. Hybridization to TPC-1 interphase nuclei showed one yellow domain, and 1 red and 1 green domain separated by a large physical distance. Further analysis of metaphase spreads revealed a complex translocation t(1;10;21)(1pter > 1q31::21q22.1 > 21qter; 10q11.2 > 10pter::1q31 > 1qter; 21pter > 21q22.1;;10q21.2 > 10q11.2::10q21.2 > 10qter) and loss of the H4 gene locus on the nontranslocated chromosome 10. Conclusions. Break point spanning probes can reliably detect ret rearrangements in interphase nuclei. Locus-specific and whole chromosome painting probes can be used to further characterize complex rearrangements by fluorescence in situ hybridization to metaphase spreads. The papillary thyroid cancer cell line TPC-1 carries the paracentric inversion 10q inv(10)(q11.2q21) and a complex t(q; 10; 21) translocation. Deletion of the H4 gene on the chromosome 10 not involved in the t(1; 10; 21) translocation suggests lack of normal H4 expression in the TPC-1 cell line. Further studies will have to address the role of the H4 gene product in tumor genesis and progression. C1 LAWRENCE BERKELEY LAB,CTR MOLEC CYTOGENET,BERKELEY,CA 94720. VET AFFAIRS MED CTR,SAN FRANCISCO,CA 94121. UNIV CALIF SAN FRANCISCO,MT ZION MED CTR,DEPT SURG,SAN FRANCISCO,CA 94120. NR 20 TC 29 Z9 29 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0039-6060 J9 SURGERY JI Surgery PD DEC PY 1995 VL 118 IS 6 BP 1018 EP 1023 DI 10.1016/S0039-6060(05)80108-4 PG 6 WC Surgery SC Surgery GA TH947 UT WOS:A1995TH94700015 PM 7491517 ER PT J AU BALDWIN, KP MATZGER, AJ SCHEIMAN, DA TESSIER, CA VOLLHARDT, KPC YOUNGS, WJ AF BALDWIN, KP MATZGER, AJ SCHEIMAN, DA TESSIER, CA VOLLHARDT, KPC YOUNGS, WJ TI SYNTHESIS, CRYSTAL-STRUCTURE, AND POLYMERIZATION OF 1,2/5,6/9,10-TRIBENZO-3,7,11,13-TETRADEHYDRO[14]ANNULENE SO SYNLETT LA English DT Note DE DEHYDROBENZOANNULENES; STRAINED HYDROCARBONS; 1,3-DIYNE TOPOCHEMICAL POLYMERIZATION ID SOLID-STATE POLYMERIZATION; SINGLE-CRYSTALS; POLY(ALPHA,OMEGA-ALKYLDIYNE) MACROMONOMERS; DIACETYLENE CRYSTALS; OPTICAL-PROPERTIES; POLY(DIACETYLENES); FILMS; POLYDIACETYLENE; DELOCALIZATION; CONDUCTIVITY AB The title compound constitutes a strained [14]annulene incorporating a 1,3-diyne unit amenable to topochemical polymerization. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV AKRON,DEPT CHEM,AKRON,OH 44325. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NYMA INC,CLEVELAND,OH 44135. RI Matzger, Adam/G-7497-2016 OI Matzger, Adam/0000-0002-4926-2752 NR 69 TC 88 Z9 88 U1 1 U2 7 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0936-5214 J9 SYNLETT JI Synlett PD DEC PY 1995 IS 12 BP 1215 EP & PG 0 WC Chemistry, Organic SC Chemistry GA TK465 UT WOS:A1995TK46500004 ER PT J AU Exarhos, GJ Sharma, SK AF Exarhos, GJ Sharma, SK TI Influence of processing variables on the structure and properties of ZnO films SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 24-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE deposition process; Raman scattering; sputtering; zinc oxide AB Zinc oxide films of high optical quality have been deposited onto both silica and silicon substrates using reactive sputtering, pulsed laser deposition, and an aqueous solution based technique. Films have been characterized with respect to crystalline phase and phase stability, surface morphology, and optical response by means of X-ray diffraction, Raman spectroscopy, atomic force microscopy, optical transmission and ellipsometry measurements. All films studied were of the wurtzite phase, fine-grained, and exhibited varying degrees of c-axis orientation with respect to the substrate normal depending upon deposition conditions. Films showed some degree of residual tensile stress which was inferred from the E(2) Raman line shift relative to the single-crystal frequency. The wurtzite phase was found to be stable to temperatures near 800 degrees C, but at higher temperatures, reaction with silica led to evolution of Zn2SiO4 at the interface. Variations in Raman line intensities upon post-deposition annealing have been correlated with oxidation of excess zinc in the lattice. C1 UNIV HAWAII, HONOLULU, HI 96822 USA. RP Exarhos, GJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 21 TC 233 Z9 234 U1 5 U2 58 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 1 PY 1995 VL 270 IS 1-2 BP 27 EP 32 DI 10.1016/0040-6090(95)06855-4 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TM187 UT WOS:A1995TM18700007 ER PT J AU Affinito, J Martin, P Gross, M Coronado, C Greenwell, E AF Affinito, J Martin, P Gross, M Coronado, C Greenwell, E TI Vacuum deposited polymer metal multilayer films for optical application SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 24-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE deposition process; polymers; metals; multilayers AB Vacuum-deposited polymer/silver/polymer reflectors and tantalum/polymer/aluminum Fabry-Perot interference filters were fabricated in a vacuum web coating operation on polyester substrates with a new, high-speed deposition process. Reflectivities were measured in the wavelength range from 0.3 mu m to 0.8 mu m. This new vacuum processing technique has been shown to be capable of deposition line speeds in excess of 500 linear m min(-1) (D.G. Shaw and M.G. Langlois, Proc. 7th Int Conf, Vacuum Web Coating, November 1993, p. 268). Central to this technique is a new vacuum deposition process for the high-rate deposition of polymer films. This polymer process involves the flash evaporation of an acrylic monomer onto a moving substrate. The monomer is subsequently cured by an electron beam or ultraviolet light. This high-speed polymer film deposition process has been named the polymer multi-layer process. Also, vacuum-deposited, index-matched, polymer/CaF2 composites were fabricated from monomer slurries that were subsequently cured with ultraviolet light. This second technique is called the liquid multi-layer process. Each of these polymer processes is compatible with each other and with conventional vacuum deposition processes such as sputtering or evaporation. RP Affinito, J (reprint author), PACIFIC NW LAB, DEPT MAT SCI, BATTELLE BLVD, MAIL STOP K3-59, RICHLAND, WA 99352 USA. NR 8 TC 21 Z9 21 U1 2 U2 12 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 1 PY 1995 VL 270 IS 1-2 BP 43 EP 48 DI 10.1016/0040-6090(95)06853-8 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TM187 UT WOS:A1995TM18700010 ER PT J AU Krauss, AR Im, J Schultz, JA Smentkowski, VS Waters, K Zuiker, CD Gruen, DM Chang, RPH AF Krauss, AR Im, J Schultz, JA Smentkowski, VS Waters, K Zuiker, CD Gruen, DM Chang, RPH TI Pulsed ion beam characterization of CVD diamond surfaces under thin film deposition conditions SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 25-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE chemical vapour deposition; diamond; deposition process; carbon ID POLYCRYSTALLINE TUNGSTEN; SCATTERING; OXYGEN; ICISS AB Diamond and diamond-like carbon have properties which in principle make them ideally suited to a wide variety of thin-film applications. The widespread use of diamond thin films, however, has been limited for a number of reasons related largely to the lack of understanding and control of the nucleation and growth processes. Real-time, in-situ studies of the surface of the growing diamond film are experimentally difficult because these films are normally grown under a relatively high pressure of hydrogen, and conventional surface analytical methods require an ultrahigh vacuum environment. Pulsed ion beam based analytical methods with differentially pumped ion sources and particle detectors are able to characterize the uppermost atomic layer of a film during growth at ambient pressures in the range 0.7-27 Pa (4-6 orders of magnitude higher than other surface-specific analytical methods). We describe here a system which has been developed for the purpose of determining the hydrogen concentration and bonding sites on diamond surfaces as a function of sample temperature and ambient hydrogen pressure under hot-filament chemical vapor deposition (CVD) growth conditions. It is demonstrated that as the hydrogen partial pressure increases the saturation hydrogen coverage of the surface of a CVD diamond film increases, but that the saturation level depends on the atomic hydrogen concentration and substrate temperature. At the highest temperatures studied (700 degrees C), it was found that the surface hydrogen concentration did not exceed 1/4 monolayer. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. IONWERKS CORP, HOUSTON, TX 77130 USA. RP ARGONNE NATL LAB, DIV MAT SCI, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Chang, R.P.H/B-7505-2009 NR 34 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 1 PY 1995 VL 270 IS 1-2 BP 130 EP 136 DI 10.1016/0040-6090(95)06991-7 PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TM187 UT WOS:A1995TM18700026 ER PT J AU Zuiker, C Krauss, AR Gruen, DM Pan, X Li, JC Csencsits, R Erdemir, A Bindal, C Fenske, G AF Zuiker, C Krauss, AR Gruen, DM Pan, X Li, JC Csencsits, R Erdemir, A Bindal, C Fenske, G TI Physical and tribological properties of diamond films grown in argon-carbon plasmas SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 24-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE chemical vapour deposition; diamond; plasma processing and deposition ID CHEMICAL-VAPOR-DEPOSITION; RAMAN-SCATTERING; THIN-FILMS; FRICTION; SPECTRA; WEAR AB Nanocrystalline diamond films have been deposited using a microwave plasma consisting of argon, 2-10% hydrogen and a carbon precursor such as C-60 or CH4. it was found that it is possible to grow the diamond phase with both carbon precursors, although the hydrogen concentration in the plasma was 1-2 orders of magnitude lower than normally required in the absence of the argon. Auger electron spectroscopy, X-ray diffraction measurements and transmission electron microscopy indicate the films are predominantly composed of diamond. Surface roughness, as determined by atomic force microscopy and scanning electron microscopy indicate the nanocrystalline films grown in low hydrogen content plasmas are exceptionally smooth (30-50 nm rms) to thicknesses of 10 m. The smooth nanocrystalline films result in low friction coefficients (mu = 0.04-0.06) and low average wear rates as determined by bail-on-disk measurements. C1 ARGONNE NATL LAB,CHEM & ENERGY TECHNOL DIV,ARGONNE,IL 60439. RP Zuiker, C (reprint author), ARGONNE NATL LAB,DIV SCI MAT,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 24 TC 82 Z9 84 U1 0 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 1 PY 1995 VL 270 IS 1-2 BP 154 EP 159 DI 10.1016/0040-6090(95)06882-1 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TM187 UT WOS:A1995TM18700030 ER PT J AU Boorman, GA Sills, RC Grumbein, S Hailey, R Miller, RA Herbert, RA AF Boorman, GA Sills, RC Grumbein, S Hailey, R Miller, RA Herbert, RA TI Long-term toxicity studies of ozone in F344/N rats and B6C3F1 mice SO TOXICOLOGY LETTERS LA English DT Article; Proceedings Paper CT 7th International Congress of Toxicology CY JUL 02-06, 1995 CL SEATTLE, WA SP Boeing Co, NIEHS, NIH, Soc Toxicol, USA, Dow Chem, FDA, Natl Ctr Toxicol Res, NHLBI, Sanofi Winthrop Inc, USA Med Res & Med Command, US DOE, US EPA, Natl Ctr Environm Assessment, BP Amer Inc, Battelle Mem Inst, Battelle Pacific NW Labs, Burroughts Wellcome Fund, Bristol Myers Squibb, DowElanco, ECETOC, Eli Lilly & Co, Genentech Inc, Hoffmann LaRoche, Johnson & Johnson, Nutrasweet, Owens Corning, Rhone Poulenc Inc, Schering Plough Res Inst, Atlantic Richfield Co, CanTox Incorp, Coca Cola Co, Colgate Palmolive, Chem Manufacturers Assoc, DuPont, Eastman Kodak Co, Hoechst Celanese, NIH, Pfizer, Proctor & Gamble, R J Reynolds Tobacco Co, Syntex Corp, TSI Corp, Warner Lambert, Zeneca Cent Toxicol Lab & Safety Med Grp, Alcon Labs, BP Goodrich Co, FMC Corp, Rhone Poulenc Rorer, Marck Res Labs, Rohm & Hass Co, Searle, SmithKline Beecham Pharm DE ozone; toxicity; carcinogenicity; bioassay; lung; neoplasia ID LUNG-TUMORS; CARCINOGENESIS; INHALATION; EXPOSURE AB The toxicity and carcinogenicity of ozone was evaluated in Fischer 344/N rats and B6C3F1 mice exposed to 0, 0.12 (2 years only), 0.5 or 1.0 ppm ozone by inhalation for 2-year and lifetime exposures. A 2-year cocarcinogenicity study (male rats only) included the subcutaneous administration of 0, 0.1 or 1.0 mg/kg/body wt. of 4-(N-methyl-N-nitrosamino)-1-(3-pyridyl)-1-butanone (NNK) for the first 20 weeks along with inhalation exposure to 0 or 0.5 ppm ozone followed by additional 84 weeks of ozone exposure alone. Ozone exposure in rats did not cause an increased incidence of lung neoplasms. In the cocarcinogenicity study? ozone exposure did not have an additive carcinogenic effect. Lifetime and 2-year ozone exposure was associated with a marginal increase in lung tumors in male B6C3F1 mice and a more pronounced increase in females. Unique mutations in the K-ras gene were found in the mouse lung neoplasms from the ozone-exposed mice. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP Boorman, GA (reprint author), NIEHS, ENVIRONM TOXICOL PROGRAM, POB 12233, RES TRIANGLE PK, NC 27709 USA. NR 19 TC 9 Z9 9 U1 1 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD DEC PY 1995 VL 82-3 BP 301 EP 306 DI 10.1016/0378-4274(95)03483-8 PG 6 WC Toxicology SC Toxicology GA TU514 UT WOS:A1995TU51400045 PM 8597069 ER PT J AU Thompson, LH Wu, RW Felton, JS AF Thompson, LH Wu, RW Felton, JS TI Genetically modified Chinese hamster ovary (CHO) cells for studying the genotoxicity of heterocyclic amines from cooked foods SO TOXICOLOGY LETTERS LA English DT Article; Proceedings Paper CT 7th International Congress of Toxicology CY JUL 01-06, 1995 CL SEATTLE, WA SP Boeing Co, NIEHS, NIH, Soc Toxicol, USA, Dow Chem, FDA, Natl Ctr Toxicol Res, NHLBI, Sanofi Winthrop Inc, USA Med Res & Med Command, US DOE, US EPA, Natl Ctr Environm Assessment, BP Amer Inc, Battelle Mem Inst, Battelle Pacific NW Labs, Burroughts Wellcome Fund, Bristol Myers Squibb, DowElanco, ECETOC, Eli Lilly & Co, Genentech Inc, Hoffmann LaRoche, Johnson & Johnson, Nutrasweet, Owens Corning, Rhone Poulenc Inc, Schering Plough Res Inst, Atlantic Richfield Co, CanTox Incorp, Coca Cola Co, Colgate Palmolive, Chem Manufacturers Assoc, DuPont, Eastman Kodak Co, Hoechst Celanese, NIH, Pfizer, Proctor & Gamble, R J Reynolds Tobacco Co, Syntex Corp, TSI Corp, Warner Lambert, Zeneca Cent Toxicol Lab & Safety Med Grp, Alcon Labs, BP Goodrich Co, FMC Corp, Rhone Poulenc Rorer, Marck Res Labs, Rohm & Hass Co, Searle, SmithKline Beecham Pharm DE DNA repair; mutagenesis; metabolic activation; heterocyclic amines; PhIP; IQ ID MUTAGEN 2-AMINO-1-METHYL-6-PHENYLIMIDAZO<4,5-B>PYRIDINE; REPAIR-DEFICIENT; DNA-REPAIR; CARCINOGEN METABOLISM; AROMATIC-AMINES; ACTIVATION; PHIP; CYTOCHROME-P-450; GENE; IDENTIFICATION AB We have developed metabolically competent Chinese hamster ovary (CHO) cells to evaluate the genotoxicity associated with heterocyclic amines, such as those that are present in cooked foods. Into repair-deficient UV5 cells we introduced cDNAs for expressing cytochrome P450IA2 and acetyltransferases. We then genetically reverted these transformed lines to obtain matched metabolically competent repair-deficient/proficient lines. For a high mutagenic response, we find a requirement for acetyltransferase with 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) but not with 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP). This system allows for both quantifying mutagenesis and analyzing the mutational spectra produced by heterocyclic amines. RP Thompson, LH (reprint author), LAWRENCE LIVERMORE NATL LAB, BIOL & BIOTECHNOL RES PROGRAM, L452, POB 808, LIVERMORE, CA 94551 USA. FU NCI NIH HHS [CA55861] NR 41 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER IRELAND LTD PI CLARE PA ELSEVIER HOUSE, BROOKVALE PLAZA, EAST PARK SHANNON, CO, CLARE, 00000, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD DEC PY 1995 VL 82-3 BP 883 EP 889 DI 10.1016/0378-4274(95)03527-3 PG 7 WC Toxicology SC Toxicology GA TU514 UT WOS:A1995TU51400126 PM 8597157 ER PT J AU SELINDER, TI MILLER, DJ GRAY, KE SARDELA, MR HULTMAN, L AF SELINDER, TI MILLER, DJ GRAY, KE SARDELA, MR HULTMAN, L TI PHASE-FORMATION AND MICROSTRUCTURE OF NB1-XALXN ALLOY-FILMS GROWN ON MGO(001) BY REACTIVE SPUTTERING - A NEW TERNARY PHASE SO VACUUM LA English DT Article ID X-RAY-DIFFRACTION; THIN-FILMS; DEPOSITION AB Ternary Nb1-xAlxN films were grown on single-crystal MgO(001) substrates by reactive triode sputtering in an Ar+N-2 gas mixture. A phase spread deposition technique was employed to fabricate films with a composition gradient along the length of a substrate. For a deposition temperature of 500 degrees C, X-ray diffraction (XRD) showed that the compound films had the cubic B1 structure for Al fractions in the range from 0 < x < 0.60. The lattice parameter decreased with increasing x, from 4.41 Angstrom at x = 0 to approximately 4.26 Angstrom for x = 0.59. A new ternary Nb-Al-N phase was discovered in a narrow composition range around 63% Al. This phase crystallized in an fee structure with a unit cell size of 4.15 + 0.02 Angstrom and was stabilized possibly by epitaxy to the single crystal substrate. For Al fractions beyond 65% XRD indicated nanocrystalline films having the hexagonal wurtzite structure. Determination of elastic strain, crystallographic tilt and microstructural quality was performed by high resolution XRD reciprocal space mapping. Epitaxial films with x < 0.50 grew essentially unstrained, with the mismatch accommodated by means of misfit dislocations giving the film a mosaic character. Growth modes and phase decomposition paths of the metastable BI films at x less than or equal to 0.60, as well as the structure of the new phase at x = 0.63, were assessed by planar and cross sectional transmission electron microscopy. C1 LINKOPING UNIV,DIV THIN FILM,S-58183 LINKOPING,SWEDEN. RP SELINDER, TI (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 15 TC 15 Z9 15 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0042-207X J9 VACUUM JI Vacuum PD DEC PY 1995 VL 46 IS 12 BP 1401 EP 1406 DI 10.1016/0042-207X(95)00161-1 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA RU418 UT WOS:A1995RU41800010 ER PT J AU Graedel, TE Benkovitz, CM Keene, WC Lee, DS Marland, G AF Graedel, TE Benkovitz, CM Keene, WC Lee, DS Marland, G TI Global emissions inventories of acid-related compounds SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian ID ATMOSPHERE; SULFUR; VOLCANOS; NITROGEN; DIOXIDE; OXIDES; BUDGET AB Computer assessments of the atmospheric chemistry and air quality of the past, present, and future rely in part on inventories of emissions constructed on appropriate spatial and temporal scales and with appropriate chemical species. Accurate inventories are also of substantial utility to field measurement scientists and the regulatory and policy communities. The production of global emissions inventories is the task of the Global Emissions Inventory Activity (GEIA) of the International Global Atmospheric Chemistry Project (IGAC). This paper presents a summary of recent emissions inventories from GEIA and other programs for reference year 1985, with special attention directed to emissions of the acid-related compounds CO2 (approximate to 6.2 Pg C yr(-1) anthropogenic), SOx (approximate to 65 Tg S yr(-1) anthropogenic and 15 Tg S yr(-1) natural), NOx (approximate to 21 Tg N yr(-1) anthropogenic and 15-20 Tg N yr(-1) natural), HCl (approximate to 55 Tg Cl yr(-1) total), and NH3 (approximate to 45 Tg N yr(-1) total). The global acid-equivalent flux of about 4.2 Teq H(+)yr(-1) is about equally attributable to SOx and NOx emissions. For some of the acid-related species, historic inventories an available for a century or more; all show dramatic emissions increases over that period. IPCC scenario IS92a is used here as the basis for constructing global acid-related emissions estimates for selected years to 2100; among the results are that acid equivalent emissions are expected to more than double in the coming century. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV VIRGINIA,DIV ENVIRONM SCI,CHARLOTTESVILLE,VA 22903. AEA TECHNOL,DIDCOT OX11 0RA,OXON,ENGLAND. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP Graedel, TE (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 36 TC 17 Z9 18 U1 1 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 1 BP 25 EP 36 DI 10.1007/BF00483686 PG 12 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UB051 UT WOS:A1995UB05100006 ER PT J AU Holland, D Simmons, C Smith, L Cohn, T Baier, G Lynch, J Grimm, J Oehlert, G Lindberg, S AF Holland, D Simmons, C Smith, L Cohn, T Baier, G Lynch, J Grimm, J Oehlert, G Lindberg, S TI Long-term trends in NADP/NTN precipitation chemistry data: Results of different statistical analyses SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian DE long-term trends; sulfate; statistical models ID SULFATE AB This paper summarizes the results of four statistical approaches for the estimation of long-term trends (1983-92) in sulfate concentration data from 90 monitoring sites across the United States. Least squares regression models and nonparametric techniques were applied to these data. Sulfate concentrations were found to be generally decreasing on the order of 0-4% at most sites. There was general agreement that trends were significant in the Great Lakes, Pacific northwest, and southwest regions. Although strengths and weaknesses are described for each approach, all of these approaches are useful for long-term trend estimation. Visualization techniques are recommended for displaying trend patterns and associated levels of statistical significance. C1 COLORADO STATE UNIV,FT COLLINS,CO 80523. MANTECH ENVIRONM TECHNOL INC,RES TRIANGLE PK,NC 27709. US GEOL SURVEY,RESTON,VA 22092. PENN STATE UNIV,UNIVERSITY PK,PA 16802. UNIV MINNESOTA,ST PAUL,MN 55108. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Holland, D (reprint author), US EPA,RES TRIANGLE PK,NC 27711, USA. NR 10 TC 10 Z9 10 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 2 BP 595 EP 601 DI 10.1007/BF00476894 PG 7 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UB053 UT WOS:A1995UB05300052 ER PT J AU Lindberg, SE Meyers, TP Munthe, J AF Lindberg, SE Meyers, TP Munthe, J TI Evasion of mercury vapor from tee surface of a recently limed acid forest lake in Sweden SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian ID VOLATILE MERCURY AB Mercury is emitted from soil and water surfaces, but few actual direct flux measurements have been reported. During June, 1994 we performed the first micrometeorological measurements of Hg vapor fluxes over a boreal forest lake. Using highly precise methods with multiple replicate samplers, we measured concentration gradients of Hg vapor, CO2 and H2O over the lake surface. Mercury was readily emitted from the lake surface, and we found no evidence of Hg dry deposition to the lake. Emission rates over the lake averaged 8.5 ng m(-2) h(-1), and appeared to be weakly influenced by water temperature and solar radiation. These fluxes were somewhat higher than those previously measured using surface chambers at this site. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NOAA,ATMOSPHER TURBULENCE & DIFFUS DIV,OAK RIDGE,TN. RP Lindberg, SE (reprint author), SWEDISH ENVIRONM RES INST,POB 47086,S-40258 GOTHENBURG,SWEDEN. RI Meyers, Tilden/C-6633-2016 NR 13 TC 35 Z9 36 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 2 BP 725 EP 730 DI 10.1007/BF00476915 PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UB053 UT WOS:A1995UB05300073 ER PT J AU Haines, TA Komov, VT Matey, VE Jagoe, CH AF Haines, TA Komov, VT Matey, VE Jagoe, CH TI Perch mercury content is related to acidity and color of 26 Russian lakes SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian DE fish; mercury; lake chemistry; biomagnification ID FISH; WATERS; METHYLMERCURY; ACCUMULATION AB We determined mercury in fish (perch Perca fluviatilis) from 26 Russian lakes in three regions over four years. The lakes ranged in size from 2 to 395,000 ha, in pH from 4.5 to 10.4 and In color from 3 to 190 hazen. Sixteen lakes were drainage lakes, with permanent outlets, and 10 were seepage lakes, with no permanent inlet; or outlet. The lakes were generally located in forested regions with little or no human habitation in the watershed. The three regions were geologically distinct: Precambrian Shield granitic bedrock covered with thin soil; Triassic bedrock covered with thick glacial tills; and Triassic bedrock covered with thin sediments. At each lake water samples were collected and analyzed for pq acid neutralizing capacity (ANC), major cations, and anions. Dissolved mercury species were estimated with (I thermodynamic equilibrium model (MINTEQA2). Mercury content of dorsal muscle varied from 0.04 to 1.0 mu g/g wet weight, and was linearly related to calculated HgCH3Cl(r(2)=0.68, p<0.001). Lake HgCH3Cl, in turn, was related to lake pH (r(2)=0.86, p<0.001). Stepwise multiple regression selected lake HgCH3 and color as the factors most highly related to fish mercury content, with the model accounting for 75% of the variation. C1 ID PAPANIN INLAND WATER INST,BOROK 152742,RUSSIA. UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP Haines, TA (reprint author), UNIV MAINE,NATL BIOL SURVEY,5751 MURRAY HALL,ORONO,ME 04469, USA. RI Komov, Viktor/O-8916-2015 OI Komov, Viktor/0000-0001-9124-7428 NR 28 TC 24 Z9 26 U1 2 U2 5 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 2 BP 823 EP 828 DI 10.1007/BF00476931 PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UB053 UT WOS:A1995UB05300089 ER PT J AU Kelly, JM Samuelson, L Edwards, G Hanson, P Kelting, D Mays, A Wullschleger, S AF Kelly, JM Samuelson, L Edwards, G Hanson, P Kelting, D Mays, A Wullschleger, S TI Are seedlings reasonable surrogates for trees? An analysis of ozone impacts on Quercus rubra SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian DE northern red oak; open-top chambers; plant stress; photosynthesis; carbon allocation ID ACIDIC PRECIPITATION; GROWTH; PINE; EXPOSURE; STRESS; PLANTS; RAIN AB The appropriateness of using seedling responses to predict mature tree responses to ozone is questionable considering the long life span of trees. To determine if northern red oak (Quercus rubra L.) seedlings and mature trees respond similarly to ozone, 30-year-old trees and two-year-old seedlings were fumigated with subambient ambient, and twice ambient concentrations of ozone for three growing seasons it using an open-top chamber facility. Ozone reduced leaf physiological function of mature trees. However, stem diameter growth and leaf mass of mature trees were not significantly reduced by ozone. Photosynthesis in seedling leaves was slightly reduced by ozone, but seedling growth and biomass were unaffected. Mature tree fine-root biomass responded negatively to increasing ozone, while seedlings exhibited increases in biomass. Carbon retention was enhanced in leaves and branches of mature trees by ozone treatment, while seedlings were unresponsive. Differences in ozone uptake, recurrent flushing and carbon dynamics rather than microclimate may explain differences in ozone sensitivity between seedlings and mature trees. These results indicate that seedlings may not reflect the ozone sensitivity of larger more physiologically mature trees. C1 AUBURN UNIV,SCH FORESTRY,AUBURN,AL 36849. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. VIRGINIA POLYTECH INST & STATE UNIV,COLL FORESTRY & WILDLIFE RESOURCES,BLACKSBURG,VA 24061. RP Kelly, JM (reprint author), TVA,ATMOSPHER SCI,POB 920,NORRIS,TN 37828, USA. RI Hanson, Paul J./D-8069-2011; Wullschleger, Stan/B-8297-2012 OI Hanson, Paul J./0000-0001-7293-3561; Wullschleger, Stan/0000-0002-9869-0446 NR 25 TC 28 Z9 29 U1 0 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 3 BP 1317 EP 1324 DI 10.1007/BF00477164 PG 8 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UD335 UT WOS:A1995UD33500047 ER PT J AU Nodvin, SC VanMiegroet, H Lindberg, SE Nicholas, NS Johnson, DW AF Nodvin, SC VanMiegroet, H Lindberg, SE Nicholas, NS Johnson, DW TI Acidic deposition, ecosystem processes, and nitrogen saturation in a high elevation Southern Appalachian watershed SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian DE atmospheric deposition; nitrogen saturation; budgets; calcium export; sulphate adsorption ID GREAT-SMOKY-MOUNTAINS; CANOPY INTERACTIONS; ACIDIFICATION; FORESTS; STREAMS AB High-elevation red spruce-Fraser fir forests in the Southern Appalachian mountains: 1) receive among the highest rates of atmospheric deposition measured in North America, 2) contain old-growth forests, 3) have shown declines in forest health, 4) have sustained high insect-caused fir mortality, and 5) contain poorly buffered soils and stream systems. High rates of nitrogen and sulphur deposition (similar to 1900 and similar to 2200 Eq . ha(-1)yr(-1), respectively) are dominated by dry and cloud deposition processes. Large leaching fluxes of nitrate-nitrogen (100-1400 Eq . ha(-1)yr(-1)) occur within the soil profile. We have expanded the study to the watershed scale with monitoring of: precipitation, throughfall, stream hydrology,and stream chemistry. Two streamlets drain the 17.4 ha Noland Divide Watershed (1676-1920m) located in the Great Smoky Mountains National Park. A network of 50 20x20 m plots is being used to assess stand structure, biomass, and soil nutrient pools. Nitrate is the predominant anion in the streamlets (weighted concentrations: 47 and 54 mu eq . L(-1) NO3-; 31 and 43 mu eq . L(-1) SO42-). Watershed nitrate export is extremely high (similar to 1000 Eq . ha(-1) yr(-1)), facilitating significant base cation exports. Stream acid neutralizing capacity values are extremely low (-10 to 20 mu eq . L(-1)) and episodic acidifications (pH declines of a full unit in days or weeks time) occur. Annual streamwater sulfate export is on the order of 770 Eq . ha(-1)yr(-1) or about one-third of total annual inputs, indicating there is net watershed sulfate retention. The system is highly nitrogen saturated (Stage 2, Stoddard, 1994) and this condition promotes both chronic and episodic stream acidification. C1 UNIV TENNESSEE,GRAD FAC ECOL & EVOLUTIONARY BIOL,KNOXVILLE,TN 37996. UTAH STATE UNIV,DEPT FOREST RESOURCES,LOGAN,UT 84322. OAK RIDGE NATL LAB,GFEBB,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. TENNESSEE VALLEY AUTHOR,NORRIS,TN 37828. UNIV NEVADA,DESERT RES INST,RENO,NV 89506. RP Nodvin, SC (reprint author), UNIV TENNESSEE,NATL BIOL SERV,KNOXVILLE,TN 37996, USA. RI Van Miegroet, Helga/A-1925-2012 NR 21 TC 47 Z9 48 U1 1 U2 11 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 3 BP 1647 EP 1652 DI 10.1007/BF00477216 PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UD335 UT WOS:A1995UD33500099 ER PT J AU Shubzda, J Lindberg, SE Garten, CT Nodvin, SC AF Shubzda, J Lindberg, SE Garten, CT Nodvin, SC TI Elevational trends in the fluxes of sulphur and nitrogen in throughfall in the southern Appalachian mountains: Some surprising results SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian DE atmospheric deposition; high elevation forests; foliar uptake; cloudwater; nitrogen; sulphur ID DEPOSITION; FOREST; SULFUR AB From 1986-1989, a team of scientists measured atmospheric concentrations and fluxes in precipitation and throughfall, and modeled dry and cloudwater deposition in a spruce-fir forest of the Great Smoky Mountains National Park which is located in the Southern Appalachian Region of the United States. The work was part of the Integrated Forest Study (IFS) conducted at 12 forests in N. America and Europe. The spruce-fir forest at 1740 m consistently received the highest total deposition rates (similar to 2200, 1200, and 700 eq ha(-1) yr(-1) for SO42-, NO3-, and NH4+). During the summers of 1989 and 1990 we used multiple samplers to measure hydrologic, SO42-, and NO3- fluxes in rain and throughfall events beneath spruce forests above (1940 m) and below (1720 m) cloud base. Throughfall was used to estimate total deposition using relationships determined during the IFS. Although the SO42- fluxes increased with elevation by a factor of similar to 2 due to higher cloudwater interception at 1940 m, the NO3- fluxes decreased with elevation by similar to 30%. To investigate further, we began year round measurements of fluxes of all major ions in throughfall below spruce-fir forests at 1740 m and at 1920 m in 1993-1994. The fluxes of most ions showed a 10-50% increase with elevation due to the similar to 70 cm yr(-1) cloudwater input at 1920 m. However, total inorganic nitrogen exhibited a 40% lower flux in throughfall at 1920 m than at 1740 m suggesting either higher dry deposition to trees at 1740 m or much higher canopy uptake of nitrogen by trees at 1920 m. Differential canopy absorption of N by trees at different elevations would have significant consequences for the use of throughfall N fluxes to estimate deposition. We used artificial trees to understand the foliar interactions of N. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37763. UNIV TENNESSEE,NATL BIOL SERV,KNOXVILLE,TN 37996. UNIV TENNESSEE,GRAD FAC ECOL & EVOLUTIONARY BIOL,KNOXVILLE,TN 37996. RP Shubzda, J (reprint author), UNIV TENNESSEE,DEPT ECOL & EVOLUT BIOL,KNOXVILLE,TN 37996, USA. NR 10 TC 26 Z9 28 U1 2 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 4 BP 2265 EP 2270 DI 10.1007/BF01186171 PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UE158 UT WOS:A1995UE15800067 ER PT J AU Foell, W Green, C Amann, M Bhattacharya, S Carmichael, G Chadwick, M Cinderby, S Haugland, T Hettelingh, JP Hordijk, L Kuylenstierna, J Shah, J Shrestha, R Streets, D Zhao, D AF Foell, W Green, C Amann, M Bhattacharya, S Carmichael, G Chadwick, M Cinderby, S Haugland, T Hettelingh, JP Hordijk, L Kuylenstierna, J Shah, J Shrestha, R Streets, D Zhao, D TI Energy use, emissions, and air pollution reduction strategies SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT 5th International Conference on Acidic Deposition - Science and Policy: Acid Reign 95 CY JUN 26-30, 1995 CL GOTHENBURG, SWEDEN SP Swedish Environm Protect Agcy, Swedish Environm Res Inst, Provincial Govt Goteborg, Provincial Govt Bohus Ian DE Asia; acid rain; energy; emissions; sulfur deposition; critical loads; sulfur dioxide; conservation ID ACID-RAIN AB In contrast to Europe and North America, air pollution in Asia is increasing rapidly, resulting in both local air quality problems and higher acidic depositions. In 1989, an east-west group of scientists initiated a multi-institutional research project on Acid Rain and Emissions Reduction in Asia, funded for the past two years by the World Bank and the Asian Development Bank. Phase I, covering 23 countries of Asia, focussed on the development of PC-based software called the Regional Air Pollution INformation and Simulation Model (RAINS-ASIA). A 90-region Regional Energy Scenario Generator was developed to create alternative energy/emission scenarios through the year 2020. A long-range atmospheric transport model was developed to calculate dispersion and deposition of sulfur, based upon emissions fi om area and large point sources, on a one-degree grid of Asia The resulting impacts of acidic deposition on a variety of vegetation types were analyzed using the critical loads approach to test different emissions management strategies, including both energy conservation measures and sulfur abatement technologies. C1 IIASA,BANGKOK,THAILAND. AIT,BANGKOK,THAILAND. UNIV IOWA,IOWA CITY,IA 52242. STOCKHOLM ENVIRONM INST,STOCKHOLM,SWEDEN. RIVM,BILTHOVEN,NETHERLANDS. AGR UNIV WAGENINGEN,6700 HB WAGENINGEN,NETHERLANDS. WORLD BANK,WASHINGTON,DC 20433. ARGONNE NATL LAB,ARGONNE,IL. CHINESE ACAD SCI,BEIJING,PEOPLES R CHINA. NR 12 TC 61 Z9 63 U1 1 U2 11 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD DEC PY 1995 VL 85 IS 4 BP 2277 EP 2282 DI 10.1007/BF01186173 PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA UE158 UT WOS:A1995UE15800069 ER PT J AU Shan, C Javandel, I Witherspoon, PA AF Shan, C Javandel, I Witherspoon, PA TI Characterization of leaky faults: Study of water flow in aquifer-fault-aquifer systems SO WATER RESOURCES RESEARCH LA English DT Article AB Leaky faults provide important flow paths for fluids to move underground. It is often necessary to characterize such faults in engineering projects such as deep well injection of waste liquids, underground natural gas storage, and radioactive waste isolation. To provide this characterization, analytical solutions are presented for groundwater flow through saturated aquifer-fault-aquifer systems assuming that both the aquifers and the fault are homogeneous and that the fault has an insignificant effect on aquifer hydraulic properties. Three different conditions are considered: (1) drawdown in the unpumped aquifer is negligibly small; (2) drawdown in the unpumped aquifer is significant, and the two aquifers have the same diffusivity; and (3) drawdown in the unpumped aquifer is significant, and the two aquifers have different diffusivities. Methods are presented to determine the fault transmissivity from pumping test data. RP Shan, C (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,BLDG 50E,BERKELEY,CA 94720, USA. NR 12 TC 12 Z9 12 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD DEC PY 1995 VL 31 IS 12 BP 2897 EP 2904 DI 10.1029/95WR02483 PG 8 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA TK647 UT WOS:A1995TK64700001 ER PT J AU McKenna, SA Poeter, EP AF McKenna, SA Poeter, EP TI Field example of data fusion in site characterization SO WATER RESOURCES RESEARCH LA English DT Article ID MODELS AB Application of data fusion to characterization of the Fountain and Lyons Formations at a field site incorporates geologic knowledge, geophysical log data, cross-hole seismic tomography, hydraulic test data, and observations of head to reduce uncertainty associated with subsurface interpretation. These formations consist of channel and overbank deposits that have undergone variable diagenesis, resulting in more hydrofacies than would have been encountered in the original, unaltered deposits. The disparate types of available data are integrated to yield a coherent hydrofacies classification through use of discriminant analysis and soft data techniques. This data fusion improves definition of the complex hydrofacies and increases knowledge of their spatial correlation. Two hundred multiple-indicator, conditional, stochastic simulations of the site are generated, 100 with only hard data and 100 with both hard and soft data. Forward groundwater flow modeling using estimates of hydraulic conductivity from field testing yields smaller head residuals for realizations which include soft data. Inverse modeling is used to eliminate hydrofacies realizations that do not honor hydraulic data and to estimate hydrofacies hydraulic conductivity ranges for the hard and hard/soft data ensembles. Inverse parameter estimation substantially decreases head residuals for both ensembles. Standard deviations of hydraulic conductivities estimated through inverse modeling are smaller when both hard and soft data are used to generate the simulations, even though head residuals are similar within the two ensembles when these estimated hydraulic conductivities are used. C1 COLORADO SCH MINES,DEPT GEOL & GEOL ENGN,GOLDEN,CO 80401. RP McKenna, SA (reprint author), SANDIA NATL LABS,GEOHYDROL DEPT,POB 5800,MAIL STOP 1324,ALBUQUERQUE,NM 87185, USA. NR 30 TC 70 Z9 70 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD DEC PY 1995 VL 31 IS 12 BP 3229 EP 3240 DI 10.1029/95WR02573 PG 12 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA TK647 UT WOS:A1995TK64700030 ER PT J AU Collins, B Wein, G AF Collins, B Wein, G TI Seed bank and vegetation of a constructed reservoir SO WETLANDS LA English DT Article DE constructed wetland; hydroperiod; seed bank; water depths; wetland management ID PRAIRIE GLACIAL MARSHES; AXE LAKE; PATTERNS; ONTARIO; WETLAND; RECRUITMENT; EMERGENCE; SEEDLINGS; GRADIENTS; ZONATION AB Vegetation development in constructed wetlands may be accelerated by planting aquatic and emergent species, especially when wetland seed banks are not initially present. Environmental patchiness of convoluted shorelines may enhance or retard establishment of planted or natural vegetation. Development of the seed bank may be influenced both by planting patterns and by shoreline convolutions. To determine if seed bank composition differed among locations, sediment cores were removed from coves, points, and straights, and from planted and unplanted regions of the shoreline of L-Lake, on the Savannah River Site near Aiken, South Carolina. This reservoir was built in 1985; portions of the shoreline were planted in 1987; and samples were taken in 1992. Sets of cores were taken from areas with water depths up to 1 m, the permanent waterline, and 1 m above water on the shore to determine the effects of hydrology on seed bank composition. Of the 136 seed bank taxa, only 33% were well represented and 35-46% occurred only once. Water depth was the primary influence on seed bank composition. Points, coves, and straights differed in species richness over water depths but did not differ in number of germinable seeds over depths, nor did locations differ in species richness or number of plants at the waterline. Planting vegetation in L-Lake did not significantly influence the seed bank; only 10% of taxa in the seed bank were planted in 1987. Of all taxa recorded, 56% were only in the seed bank, 22% were only in the vegetation, and 13% were in both the seed bank and the vegetation. RP Collins, B (reprint author), SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29802, USA. NR 36 TC 17 Z9 18 U1 2 U2 6 PU SOC WETLAND SCIENTISTS PI LAWRENCE PA 810 E TENTH ST, P O BOX 1897, LAWRENCE, KS 66044 SN 0277-5212 J9 WETLANDS JI Wetlands PD DEC PY 1995 VL 15 IS 4 BP 374 EP 385 PG 12 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA TM607 UT WOS:A1995TM60700008 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, L ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENKE, T BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BURGSMUELLER, T BUSCHMANN, P BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPER, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GERDYUKOV, L GIBBS, M GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZER, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, E KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, L LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZ, JM LOPEZFERNANDEZ, A LOPEZAGUERA, MA LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SPONHOLZ, P SQUARCIA, S STANESCU, C STAPNES, S STAVITSKI, L STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTAN, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, LA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, L ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENKE, T BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BURGSMUELLER, T BUSCHMANN, P BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPER, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GERDYUKOV, L GIBBS, M GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZER, D HOULDEN, M HRUBEC, J HUET, K 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MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SPONHOLZ, P SQUARCIA, S STANESCU, C STAPNES, S STAVITSKI, L STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTAN, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, LA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G TI STUDY OF PROMPT PHOTON PRODUCTION IN HADRONIC Z(0) DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID DENSITY PROJECTION CHAMBER; SOFT GLUON INTERFERENCE; FINAL-STATE PHOTONS; LEP-SLC ENERGIES; E+E ANNIHILATION; ELECTROWEAK COUPLINGS; QCD CORRECTIONS; Z0 DECAYS; EMISSION; BREMSSTRAHLUNG AB From a sample of 1.5 million Z(0) --> decays collected by the DELPHI detector during 1991, 1992 and 1993, the production cross section for isolated final state photons is measured and is compared with the O(alpha, alpha(s)) matrix element calculations implemented in the EEPRAD and GNJETS Monte Carlo generators. The observed photon yield is used to derive the electroweak couplings of charge 2/3 (u-type) and charge 1/3 (d-type) quarks to the Z(0) boson. The measured values C-2/3 = 0.91(-0.36)(+0.25) and c(1/3) = 1.62(-0.17)(+0.24) are compatible with the Standard Model prediction, C-2/3 = 1.145 and c(1/3) = 1.477. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VUB,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,BRATISLAVA 84215,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. CTR RECH NUCL,ULP,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,DIV HIGH ENERGY PHYS,INST PHYS,FZU,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,DUBNA 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,CNRS,IN2P3,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,CNRS,IN2P3,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,NC,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. FED UNIV RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. 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YOSHIDA, R PAU, RR ARNEODO, M CAPUA, M GARFAGNINI, A IANNOTTI, L SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A CARTIGLIA, N PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S ZHU, Q BORZEMSKI, P CHWASTOWSKI, J ESKREYS, A PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BEIER, H BIENLEIN, JK COLDEWEY, C DEPPE, O DESLER, K DREWS, G FLASINSKI, M GILKINSON, DJ GLASMAN, C GOTTLICHER, P GROSSEKNETTER, J GUTJAHR, B HAAS, T HAIN, W HASELL, D HESSLING, H IGA, Y JOHNSON, K JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MONTEIRO, T NG, JST NICKEL, S NOTZ, D OHRENBERG, K ROCO, M ROHDE, M ROLDAN, J SCHNEEKLOTH, U SCHULZ, W SELONKE, F STILIARIS, E SURROW, B VOSS, T WESTPHAL, D WOLF, G YOUNGMAN, C ZEUNER, W ZHOU, JF GRABOSCH, HJ KHARCHILAVA, A LEICH, A MATTINGLY, MCK MARI, SM MEYER, A SCHLENSTEDT, S WULFF, N BARBAGLI, G PELFER, P ANZIVINO, G MACCARRONE, G DEPASQUALE, S VOTANO, L BAMBERGER, A EISENHARDT, S FREIDHOF, A SOLDNERREMBOLD, S SCHROEDER, J TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT SAXON, DH UTLEY, ML WILSON, AS DANNEMANN, A HOLM, U HORSTMANN, D NEUMANN, T SINKUS, R WICK, K BADURA, E BUROW, BD HAGGE, L LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W ZETSCHE, F BACON, TC BRUEMMER, N BUTTERWORTH, I GALLO, E HARRIS, VL HUNG, BYH LONG, KR MILLER, DB MORAWITZ, PPO PRINIAS, A SEDGBEER, JK WHITFIELD, AF MALLIK, U MCCLIMENT, E WANG, MZ WANG, SM WU, JT CLOTH, P FILGES, D AN, SH HONG, SM NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G FERNANDEZ, JP GRACIANI, R HERNANDEZ, JM HERVAS, L LABARGA, L MARTINEZ, M DELPESO, J PUGA, J TERRON, J DETROCONIZ, JF SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIM, JN MATTHEWS, CG PATEL, PM SINCLAIR, LE STAIRS, DG LAURENT, MS ULLNANN, R ZACEK, G BASHKIROV, V DOLGOSHEIN, BA STIFULKIN, A BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KOBRIN, VD KORZHAVINA, IA KUZMIN, VA LUKINA, OY PROSKURYAKOV, AS SAVIN, AA SHCHEGLOVA, LM SOLOMIN, AN ZOTOV, NP BOTJE, M CHLEBANA, F DAKE, A ENGELEN, J DEKAMPS, M KOOIJMAN, P KRUSE, A TIECKE, H VERKERKE, W VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R ACOSTA, D BYLSMA, B DURKIN, LS GILMORE, J HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN NYLANDER, P PARK, IH ROMANOWSKI, TA SEIDLEIN, R BAILEY, DS BYRNE, A CASHMERE, RJ COOPERSARKAR, AM DEVENISH, RCE HARNEW, N LANCASTER, M LINDEMANN, L MCFALL, JD NATH, C NOYES, VA QUADT, A TICKNER, JR UIJTERWAAL, H WALCZAK, R WATERS, DS WILSON, FF YIP, T ABBIENDI, G BERTOLIN, A BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BULMAHN, J BUTTERWORTH, JM FEILD, RG OH, BY WHITMORE, JJ DAGOSTINI, G MARINI, G NIGRO, A TASSI, E HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E DUBBS, T HEUSCH, C VANHOOK, M LOCKMAN, W RAHN, JT SADROZINSKI, HFW SEIDEN, A WILLIAMS, DC BILTZINGER, J SEIFERT, RJ SCHWARZER, O WALENTA, AH ZECH, G ABRAMOWICZ, H BRISKIN, G DAGAN, S LEVY, A FLECK, JI HASEGAWA, T HAZUMI, M ISHII, T KUZE, M MINE, S NAGASAWA, Y NAKAO, M SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAKAMITSU, Y YAMAUCHI, K CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SACCHI, R SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BRKIC, M GINGRICH, DM HARTNER, GF JOE, KK LEVMAN, GM MARTIN, JF ORR, RS POLENZ, S SAMPSON, CR TEUSCHER, RJ CATTERALL, CD JONES, TW KAZIEWICZ, PB LANE, JB SAUNDERS, RL SHULMAN, J BLANKENSHIP, K LU, B MO, LW BOGUSZ, W CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM SMIENIECKA, T WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M EISENBERG, Y KARSHON, U REVEL, D ZERZION, D ALI, I BADGETT, WF BEHRENS, B DASU, S FORDHAM, C FOUDAS, C GOUSSIOU, A LOVELESS, RJ REEDER, DD SILVERSTEIN, S SMITH, WH VAICIULIS, A WODARCZYK, M TSURUGAI, T BHADRA, S CARDY, ML FAGERSTROEM, CP FRISKEN, WR FURUTANI, KM KHAKZAD, M SCHMIDKE, WB AF DERRICK, M KRAKAUER, D MAGILL, S MIKUNAS, D MUSGRAVE, B REPOND, J STANEK, R TALAGA, RL ZHANG, H 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 CONTIN, A CORRADI, M GIALAS, I GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F POLINI, A SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A BORNHEIM, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T ECKERT, M FELD, L FREY, A GEERTS, M GROTHE, M HARTMANN, H HEINLOTH, K HILGER, E JAKOB, HP KATZ, UF MENGEL, S MOLLEN, J PAUL, E PFEIFFER, M REMBSER, C SCHRAMM, D STAMM, J WEDEMEYER, R CAMPBELLROBSON, S CASSIDY, A DYCE, N FOSTER, B GEORGE, S GILMORE, R HEATH, GP HEATH, HF LLEWELLYN, TJ MORGADO, CJS NORMAN, DJP OMARA, JA TAPPER, RJ WILSON, SS YOSHIDA, R PAU, RR ARNEODO, M CAPUA, M GARFAGNINI, A IANNOTTI, L SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A CARTIGLIA, N PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S ZHU, Q BORZEMSKI, P CHWASTOWSKI, J ESKREYS, A PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BEIER, H BIENLEIN, JK COLDEWEY, C DEPPE, O DESLER, K DREWS, G FLASINSKI, M GILKINSON, DJ GLASMAN, C GOTTLICHER, P GROSSEKNETTER, J GUTJAHR, B HAAS, T HAIN, W HASELL, D HESSLING, H IGA, Y JOHNSON, K JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MONTEIRO, T NG, JST NICKEL, S NOTZ, D OHRENBERG, K ROCO, M ROHDE, M ROLDAN, J SCHNEEKLOTH, U SCHULZ, W SELONKE, F STILIARIS, E SURROW, B VOSS, T WESTPHAL, D WOLF, G YOUNGMAN, C ZEUNER, W ZHOU, JF GRABOSCH, HJ KHARCHILAVA, A LEICH, A MATTINGLY, MCK MARI, SM MEYER, A SCHLENSTEDT, S WULFF, N BARBAGLI, G PELFER, P ANZIVINO, G MACCARRONE, G DEPASQUALE, S VOTANO, L BAMBERGER, A EISENHARDT, S FREIDHOF, A SOLDNERREMBOLD, S SCHROEDER, J TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT SAXON, DH UTLEY, ML WILSON, AS DANNEMANN, A HOLM, U HORSTMANN, D NEUMANN, T SINKUS, R WICK, K BADURA, E BUROW, BD HAGGE, L LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W ZETSCHE, F BACON, TC BRUEMMER, N BUTTERWORTH, I GALLO, E HARRIS, VL HUNG, BYH LONG, KR MILLER, DB MORAWITZ, PPO PRINIAS, A SEDGBEER, JK WHITFIELD, AF MALLIK, U MCCLIMENT, E WANG, MZ WANG, SM WU, JT CLOTH, P FILGES, D AN, SH HONG, SM NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G FERNANDEZ, JP GRACIANI, R HERNANDEZ, JM HERVAS, L LABARGA, L MARTINEZ, M DELPESO, J PUGA, J TERRON, J DETROCONIZ, JF SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIM, JN MATTHEWS, CG PATEL, PM SINCLAIR, LE STAIRS, DG LAURENT, MS ULLNANN, R ZACEK, G BASHKIROV, V DOLGOSHEIN, BA STIFULKIN, A BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KOBRIN, VD KORZHAVINA, IA KUZMIN, VA LUKINA, OY PROSKURYAKOV, AS SAVIN, AA SHCHEGLOVA, LM SOLOMIN, AN ZOTOV, NP BOTJE, M CHLEBANA, F DAKE, A ENGELEN, J DEKAMPS, M KOOIJMAN, P KRUSE, A TIECKE, H VERKERKE, W VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R ACOSTA, D BYLSMA, B DURKIN, LS GILMORE, J HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN NYLANDER, P PARK, IH ROMANOWSKI, TA SEIDLEIN, R BAILEY, DS BYRNE, A CASHMERE, RJ COOPERSARKAR, AM DEVENISH, RCE HARNEW, N LANCASTER, M LINDEMANN, L MCFALL, JD NATH, C NOYES, VA QUADT, A TICKNER, JR UIJTERWAAL, H WALCZAK, R WATERS, DS WILSON, FF YIP, T ABBIENDI, G BERTOLIN, A BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BULMAHN, J BUTTERWORTH, JM FEILD, RG OH, BY WHITMORE, JJ DAGOSTINI, G MARINI, G NIGRO, A TASSI, E HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E DUBBS, T HEUSCH, C VANHOOK, M LOCKMAN, W RAHN, JT SADROZINSKI, HFW SEIDEN, A WILLIAMS, DC BILTZINGER, J SEIFERT, RJ SCHWARZER, O WALENTA, AH ZECH, G ABRAMOWICZ, H BRISKIN, G DAGAN, S LEVY, A FLECK, JI HASEGAWA, T HAZUMI, M ISHII, T KUZE, M MINE, S NAGASAWA, Y NAKAO, M SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAKAMITSU, Y YAMAUCHI, K CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SACCHI, R SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BRKIC, M GINGRICH, DM HARTNER, GF JOE, KK LEVMAN, GM MARTIN, JF ORR, RS POLENZ, S SAMPSON, CR TEUSCHER, RJ CATTERALL, CD JONES, TW KAZIEWICZ, PB LANE, JB SAUNDERS, RL SHULMAN, J BLANKENSHIP, K LU, B MO, LW BOGUSZ, W CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM SMIENIECKA, T WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M EISENBERG, Y KARSHON, U REVEL, D ZERZION, D ALI, I BADGETT, WF BEHRENS, B DASU, S FORDHAM, C FOUDAS, C GOUSSIOU, A LOVELESS, RJ REEDER, DD SILVERSTEIN, S SMITH, WH VAICIULIS, A WODARCZYK, M TSURUGAI, T BHADRA, S CARDY, ML FAGERSTROEM, CP FRISKEN, WR FURUTANI, KM KHAKZAD, M SCHMIDKE, WB TI MEASUREMENT OF ELASTIC P(0) PHOTOPRODUCTION AT HERA SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HIGH-ENERGY PHOTOPRODUCTION; DEEP INELASTIC-SCATTERING; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; MUON-PROTON-SCATTERING; LUND MONTE-CARLO; HADRONIC PROPERTIES; PHOTON; CONSTRUCTION; HYDROGEN AB Elastic rho(0) photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from ep interactions were used to measure the reaction gamma p --> rho(0)P (rho(0) --> pi(+)pi(-)) at photon-proton centre-of-mass energies between 60 and 80 GeV and \t\ < 0.5 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The differential cross section d sigma/dM(pi pi), where M(pi pi) is the invariant mass of the two pions, and the integrated cross section, sigma(gamma p-->rho)o(p), are presented; the latter was measured to be 14.7 +/- 0.4 (stat.) +/- 2.4 (syst.) mu b. The differential cross section d sigma/dt has an approximately exponential shape; a fit of the type A'(t) exp (-b'(t)\t\ + c'(t)t(2)) yields a t-slope b'(t) = 9.9 +/- 1.2 (stat.) +/- 1.4 (syst.) GeV-2. The results, when compared to low energy data, show a weak energy dependence of both sigma(gamma p-->rho)o(P) and of the t-slope. The p(0) is produced predominantly with transverse polarisation, demostrating that s-channel helicity conservation holds at these energies. C1 UNIV BOLOGNA, BOLOGNA, ITALY. INFN BOLOGNA, BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. UNIV BRISTOL, HH WILLS PHYS LAB, BRISTOL BS8 1TL, AVON, ENGLAND. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. UNIV CALABRIA, DEPT PHYS, COSENZA, ITALY. IST NAZL FIS NUCL, COSENZA, ITALY. COLUMBIA UNIV, NEVIS LABS, IRVINGTON, NY USA. INST PHYS NUCL, KRAKOW, POLAND. AGH UNIV SCI & TECHNOL, FAC PHYS & NUCL TECH, KRAKOW, POLAND. JAGIELLONIAN UNIV, DEPT PHYS, KRAKOW, POLAND. DESY, DEUTSCH ELEKTRONEN SYNCHROTRON, W-2000 HAMBURG, GERMANY. DESY ZEUTHEN, INST HOCHENERGIEPHYS, ZEUTHEN, GERMANY. UNIV FLORENCE, FLORENCE, ITALY. IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY. UNIV FREIBURG, FAK PHYS, W-7800 FREIBURG, GERMANY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW, LANARK, SCOTLAND. 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UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. IST NAZL FIS NUCL, ROME, ITALY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA. UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, SIEGEN, GERMANY. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV TOKYO, INST NUCL STUDY, TOKYO, JAPAN. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO, JAPAN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, TURIN, ITALY. IST NAZL FIS NUCL, I-10125 TURIN, ITALY. UNIV TURIN, FAC SCI 2, ALESSANDRIA, ITALY. IST NAZL FIS NUCL, ALESSANDRIA, ITALY. UNIV TORONTO, DEPT PHYS, TORONTO, ON, CANADA. UCL, DEPT PHYS & ASTRON, LONDON, ENGLAND. VIRGINIA POLYTECH INST & STATE UNIV, DEPT PHYS, BLACKSBURG, VA 24061 USA. UNIV WARSAW, INST EXPTL PHYS, WARSAW, POLAND. INST NUCL STUDIES, PL-00681 WARSAW, POLAND. WEIZMANN INST SCI, DEPT PHYS NUCL, REHOVOT, ISRAEL. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. MEIJI GAKUIN UNIV, FAC GEN EDUC, YOKOHAMA, KANAGAWA, JAPAN. YORK UNIV, DEPT PHYS, N YORK, ON M3J 1P3, CANADA. IROE, FLORENCE, ITALY. RP ARGONNE NATL LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Tassi, Enrico/K-3958-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Bashkirov, Vladimir/A-4818-2008; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Hernandez Calama, Jose Maria/H-9127-2015; Solomin, Anatoly/C-3072-2016; Graciani Diaz, Ricardo/I-5152-2016 OI Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; Hernandez Calama, Jose Maria/0000-0001-6436-7547; Graciani Diaz, Ricardo/0000-0001-7166-5198 NR 91 TC 81 Z9 81 U1 0 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1995 VL 69 IS 1 BP 39 EP 54 DI 10.1007/s002880050004 PG 16 WC Physics, Particles & Fields SC Physics GA TH559 UT WOS:A1995TH55900004 ER PT J AU BREAKSTONE, A CRAWLEY, HB FIRESTONE, A GORBICS, M ISENHOWER, LD LAMSA, JW MEYER, WT CAMPANINI, R CUFFIANI, M DALLAVALLE, CM DENINNO, M FABBRI, F GIACOMELLI, G RIMONDI, F SIROLI, GP DRIJARD, D FISCHER, H GEIST, W MORNACCHI, G PANTER, M ULLALAND, O YEUNG, R LOHSE, T MANKEL, R RAUSCHNABEL, K SCHMELLING, M WEGENER, D FLOGE, H FREHSE, H GESSWEIN, L HANKE, P HEIDEN, M HERR, W KLUGE, EE NAKADA, T PUTZER, A RENSCH, B DOROBA, K GOKIELI, R SOSNOWSKI, R SZCZEKOWSKI, M AF BREAKSTONE, A CRAWLEY, HB FIRESTONE, A GORBICS, M ISENHOWER, LD LAMSA, JW MEYER, WT CAMPANINI, R CUFFIANI, M DALLAVALLE, CM DENINNO, M FABBRI, F GIACOMELLI, G RIMONDI, F SIROLI, GP DRIJARD, D FISCHER, H GEIST, W MORNACCHI, G PANTER, M ULLALAND, O YEUNG, R LOHSE, T MANKEL, R RAUSCHNABEL, K SCHMELLING, M WEGENER, D FLOGE, H FREHSE, H GESSWEIN, L HANKE, P HEIDEN, M HERR, W KLUGE, EE NAKADA, T PUTZER, A RENSCH, B DOROBA, K GOKIELI, R SOSNOWSKI, R SZCZEKOWSKI, M TI INCLUSIVE CHARGED-PARTICLE CROSS-SECTIONS IN FULL PHASE-SPACE FROM PROTON-PROTON INTERACTIONS AT ISR ENERGIES SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article AB Measurements are presented of inclusive charged particle production in proton-proton collisions at root s = 31, 44 and 62 CeV at the CERN ISR. The large acceptance of the Split Field Magnet detector allows a single experimental setup to cover almost the full longitudinal phase space up to a transverse momentum of 3 GeV/c. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV DORTMUND,INST PHYS,D-44227 DORTMUND,GERMANY. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,D-69120 HEIDELBERG,GERMANY. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 16 TC 12 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 DEC PY 1995 VL 69 IS 1 BP 55 EP 65 DI 10.1007/s002880050005 PG 11 WC Physics, Particles & Fields SC Physics GA TH559 UT WOS:A1995TH55900005 ER PT J AU AWES, TC BLOOMER, MA BLUME, C BOCK, D BOCK, R BUCHER, D CLEWING, G GARPMAN, S GLASCOW, R GUSTAFSSON, HA GUTHROD, HH HOLKER, G IDH, J JACOBS, P KAMPERT, KH KOLB, BW LOHNER, H OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SORENSEN, SP STEFFENS, K STEINHAEUSER, P STENLUND, E STUKEN, D YOUNG, GR AF AWES, TC BLOOMER, MA BLUME, C BOCK, D BOCK, R BUCHER, D CLEWING, G GARPMAN, S GLASCOW, R GUSTAFSSON, HA GUTHROD, HH HOLKER, G IDH, J JACOBS, P KAMPERT, KH KOLB, BW LOHNER, H OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SORENSEN, SP STEFFENS, K STEINHAEUSER, P STENLUND, E STUKEN, D YOUNG, GR TI BOSE-EINSTEIN CORRELATIONS OF SOFT PIONS IN ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID TARGET FRAGMENTATION REGION; CORRELATION STRENGTH; INTERFEROMETRY; HADRON; MATTER AB A detailed analysis of pair correlations of positive pions in the target fragmentation region is presented. Data on nuclear collisions at 200 GeV per nucleon were measured with the Plastic Ball in the WA80 experiment at the CERN SPS, The correlation functions are compared with analytical functions and with simulations incorporating Bose-Einstein symmetrization, final-state interactions and detector resolution. Source radii are shown to increase with increasing target size and with centrality. For central collisions the radii are larger than the geometrical sizes of the involved nuclei. C1 GESELL SCHWERIONENFORSCH MBH,D-64291 DARMSTADT,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LUND UNIV,S-22362 LUND,SWEDEN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV GRONINGEN,KVI,9747 AA GRONINGEN,NETHERLANDS. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP AWES, TC (reprint author), UNIV MUNSTER,INST KERNPHYS,WILHELM KLEMM STR 9,D-48149 MUNSTER,GERMANY. RI Peitzmann, Thomas/K-2206-2012; Lohner, Herbert/B-2397-2014; OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X; Kampert, Karl-Heinz/0000-0002-2805-0195 NR 26 TC 10 Z9 10 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1995 VL 69 IS 1 BP 67 EP 76 DI 10.1007/s002880050006 PG 10 WC Physics, Particles & Fields SC Physics GA TH559 UT WOS:A1995TH55900006 ER PT J AU KNIEHL, BA SPIRA, M AF KNIEHL, BA SPIRA, M TI LOW-ENERGY THEOREMS IN HIGGS PHYSICS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Review ID SUPERSYMMETRIC STANDARD MODEL; HEAVY FERMION CORRECTIONS; WEINBERG-SALAM MODEL; GAMMA-GAMMA-DECAYS; MASS SUM-RULES; RADIATIVE-CORRECTIONS; QCD CORRECTIONS; BOSON PRODUCTION; PROTON COLLIDERS; HADRON SUPERCOLLIDERS AB We present low-energy theorems for the calculation of loop amplitudes with external scalar or pseudoscalar Higgs bosons which are light compared to the loop particles. Starting from existing lowest-order versions of these theorems, we show how their applicability may be extended to the two-loop level. To illustrate the usefulness of these theorems, we discuss a number of applications to Higgs production and decay at and beyond the one-loop order. C1 UNIV HAMBURG,D-22761 HAMBURG,GERMANY. INST THEORET PHYS 2,D-22761 HAMBURG,GERMANY. RP KNIEHL, BA (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,POB 500,BATAVIA,IL 60510, USA. NR 115 TC 136 Z9 136 U1 0 U2 2 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 DEC PY 1995 VL 69 IS 1 BP 77 EP 87 DI 10.1007/s002880050007 PG 11 WC Physics, Particles & Fields SC Physics GA TH559 UT WOS:A1995TH55900007 ER PT J AU BATY, RS MORRIS, PJ AF BATY, RS MORRIS, PJ TI CONFORMAL GRID GENERATION FOR HIGH-ASPECT-RATIO SIMPLY AND DOUBLY CONNECTED REGIONS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE CONFORMAL MAP; GRID GENERATION; HIGH ASPECT RATIO; AIRFOIL ID NUMERICAL-METHOD AB Conformal co-ordinate transformations are used to map rectangular computational domains onto arbitrary simply and doubly connected regions with smooth boundaries. The efficient numerical schemes of Wegmann involving the solution of the inverse boundary correspondence function problems associated with the mapping of the unit disc or circular annulus onto simply or doubly connected domains, respectively, are employed. The numerical implementation of these schemes is emphasized. Examples are generated for regions with elliptic inner and outer boundaries. Additional examples are used to demonstrate the accuracy and convergence of the schemes and their practical limitations. The techniques are found to converge well if holomorphic functions are used to describe the boundaries. The use of preconditioning maps is also discussed. C1 PENN STATE UNIV,DEPT AEROSP ENGN,UNIVERSITY PK,PA 16802. RP BATY, RS (reprint author), SANDIA NATL LABS,DEPT AEROSCI & FLUID DYNAM,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD NOV 30 PY 1995 VL 38 IS 22 BP 3817 EP 3830 DI 10.1002/nme.1620382206 PG 14 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA TE470 UT WOS:A1995TE47000005 ER PT J AU GRESHO, PM CHAN, ST CHRISTON, MA HINDMARSH, AC AF GRESHO, PM CHAN, ST CHRISTON, MA HINDMARSH, AC TI A LITTLE MORE ON STABILIZED Q(1)Q(1) FOR TRANSIENT VISCOUS INCOMPRESSIBLE-FLOW SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article; Proceedings Paper CT 2nd Japan/US Symposium on Finite Element Methods in Large-Scale Computational Fluid Dynamics CY MAR 14-16, 1994 CL CHUO UNIV, TOKYO, JAPAN SP Chuo Univ, Inst Sci & Engn HO CHUO UNIV DE STABILIZED FINITE ELEMENTS; PROJECTION METHOD; APPROXIMATE PROJECTIONS; EQUAL-ORDER INTERPOLATION ID NAVIER-STOKES EQUATIONS; FINITE-ELEMENT METHOD; VELOCITY CORRECTION METHOD; BOUNDARY-CONDITIONS; PROJECTION METHODS; FORMULATION; SCHEME AB In an attempt to overcome some of the well-known 'problems' with the Q(1)P(0) element, we have devised two 'stabilized' versions of the Q(1)Q(1) element, one based on a semi-implicit approximate projection method and the other based on a simple forward Euler technique. While neither one conserves mass in the most desirable manner, both generate a velocity field that is usually 'close enough' to divergence-free. After attempting to analyse the two algorithms, each of which includes some ad hoc 'enhancements', we present some numerical results tb show that they both seem to work well enough. Finally, we point out that any projection method that uses a 'pressure correction' approach is inherently limited to time-accurate simulations and even if treated fully implicitly, is inappropriate for seeking steady states via large time steps. RP GRESHO, PM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 34 TC 23 Z9 23 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD NOV 30 PY 1995 VL 21 IS 10 BP 837 EP 856 DI 10.1002/fld.1650211005 PG 20 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA TH690 UT WOS:A1995TH69000004 ER PT J AU GREENBERG, AR SHOJAIE, SS KRANTZ, WB TANTEKINERSOLMAZ, SB AF GREENBERG, AR SHOJAIE, SS KRANTZ, WB TANTEKINERSOLMAZ, SB TI USE OF INFRARED THERMOGRAPHY FOR TEMPERATURE-MEASUREMENT DURING EVAPORATIVE CASTING OF THIN POLYMERIC FILMS SO JOURNAL OF MEMBRANE SCIENCE LA English DT Article DE MEMBRANE PREPARATION AND STRUCTURE; THEORY; INFRARED TECHNIQUE; TEMPERATURE MEASUREMENT ID REVERSE-OSMOSIS MEMBRANES; STEP AB In this paper we describe the development of a real-time, noninvasive technique using infrared (IR) thermography for measurement of the temperature of polymer solutions cast as thin films in which evaporation of a volatile solvent occurs. The technique requires the accurate determination of a single surface radiation property, the emittance, and its dependence on the casting solution composition, We report results obtained for the cellulose acetate (CA)-acetone system for which IR measurements indicate a relatively rapid and significant temperature decrease followed by a gradual temperature recovery toward the initial temperature, In general the thin film temperature response can be described by the parameters Delta T-max, the maximum degree of cooling; t(min), the time at which T-min is reached; and the recovery temperature, T-rec, at a time equal to 2 x t(min). For 155 and 258 mu m thick films evaporatively cast from a 15 wt% CA solution, IR thermography indicated maximum temperature decreases of 18 and 26 degrees C, respectively, The characteristics of the thin film temperature curves for these two cases compare favorably with those predicted by a first-principles model recently developed by the authors. Based upon these results, the general applicability of the infrared technique for the study of dense film- and membrane-formation processes is described, and the significance of thin film temperature measurements with respect to membrane morphology is discussed. C1 UNIV COLORADO,DEPT CHEM ENGN,BOULDER,CO 80309. UNIV COLORADO,DEPT MECH ENGN,BOULDER,CO 80309. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. ISTANBUL TECH UNIV,DEPT CHEM ENGN,MASLAK 80626,TURKEY. RI Krantz, William/H-2291-2014; Tantekin-Ersolmaz, Serife Birgul/D-8744-2015 OI Krantz, William/0000-0002-3839-3968; NR 18 TC 13 Z9 13 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0376-7388 J9 J MEMBRANE SCI JI J. Membr. Sci. PD NOV 30 PY 1995 VL 107 IS 3 BP 249 EP 261 DI 10.1016/0376-7388(95)00123-2 PG 13 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA TJ652 UT WOS:A1995TJ65200006 ER PT J AU SHIANG, JJ KADAVANICH, AV GRUBBS, RK ALIVISATOS, AP AF SHIANG, JJ KADAVANICH, AV GRUBBS, RK ALIVISATOS, AP TI SYMMETRY OF ANNEALED WURTZITE CDSE NANOCRYSTALS - ASSIGNMENT TO THE C-3V POINT GROUP SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID QUANTUM DOTS; STATES AB High-resolution electron microscopy and resonance Raman spectroscopy are used to assign annealed wurtzite CdSe nanocrystals to the C-3v point group. Deviations from spherical symmetry have spectroscopic consequences for this prototypical quantum dot system. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 29 TC 146 Z9 148 U1 0 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 30 PY 1995 VL 99 IS 48 BP 17417 EP 17422 DI 10.1021/j100048a017 PG 6 WC Chemistry, Physical SC Chemistry GA TH236 UT WOS:A1995TH23600017 ER PT J AU MCLAUGHLIN, SB DOWNING, DJ AF MCLAUGHLIN, SB DOWNING, DJ TI AMBIENT OZONE AND LOBLOLLY PINES - REPLY SO NATURE LA English DT Letter RP MCLAUGHLIN, SB (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 9 TC 1 Z9 1 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 30 PY 1995 VL 378 IS 6556 BP 450 EP 451 DI 10.1038/378450a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TH054 UT WOS:A1995TH05400046 ER PT J AU LUECKE, H CHANG, BT MAILLIARD, WS SCHLAEPFER, DD HAIGLER, HT AF LUECKE, H CHANG, BT MAILLIARD, WS SCHLAEPFER, DD HAIGLER, HT TI CRYSTAL-STRUCTURE OF THE ANNEXIN-XII HEXAMER AND IMPLICATIONS FOR BILAYER INSERTION SO NATURE LA English DT Article ID SELF-ASSOCIATION; CALCIUM; SYNEXIN; IDENTIFICATION; RESOLUTION; MEMBRANES; CHANNELS AB ANNEXINS are a family of calcium- and phospholipid-binding proteins(1,2) implicated in a number of biological processes including membrane fusion(3) and ion channel formation(4-7). The crystal structure of the annexin XII hexamer, refined at 2.8 Angstrom resolution, forms a concave disk with 3-2 symmetry, about 100 Angstrom in diameter and 70 Angstrom thick with a central hydrophilic pore. Six intermolecular Ca2+ ions are involved in hexamer formation. An additional 18 Ca2+ ions are located on the perimeter of the disk, accessible only from the side of the hexameric disk. On the basis of the hexamer structure we propose here a new mode of protein-phospholipid bilayer interaction that is distinct from the hydrophobic insertion of typical membrane proteins. This speculative model postulates the Ca2+-dependent insertion of the hydrophilic annexin XII hexamer into phospholipid bilayers with local reorientation of the bilayer phospholipids. C1 UNIV CALIF IRVINE,DEPT PHYSIOL & BIOPHYS,IRVINE,CA 92717. RP LUECKE, H (reprint author), STANFORD SYNCHROTRON RADIAT LAB,MS 69,STANFORD,CA 94305, USA. RI Haigler, Harry/C-3788-2011; Luecke, Hartmut "Hudel"/F-4712-2012 OI Luecke, Hartmut "Hudel"/0000-0002-4938-0775 NR 30 TC 119 Z9 121 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 30 PY 1995 VL 378 IS 6556 BP 512 EP 515 DI 10.1038/378512a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TH054 UT WOS:A1995TH05400077 PM 7477411 ER PT J AU ARNDTSEN, BA BERGMAN, RG AF ARNDTSEN, BA BERGMAN, RG TI C-H BOND ACTIVATION IN FUNCTIONALIZED ORGANIC-COMPOUNDS WITH CP-ASTERISK(PME(3))IRME(OTF) - GENERATION, STRUCTURAL CHARACTERIZATION AND METAL-BASED REARRANGEMENT OF THE ACETONE ACTIVATION PRODUCT CP-ASTERISK(PME(3))IR(ETA(3)-CH2C(OH)CH2)(+)OTF(-) SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article DE IRIDIUM; C-H ACTIVATION; METALLACYCLES ID OXIDATIVE ADDITION; SATURATED-HYDROCARBONS; BENZENE ACTIVATION; COMPLEXES; METHANE; ALKYL; ALKANE; PERMETHYLSCANDOCENE; DERIVATIVES; METHYL AB The iridium complex Cp*(PMe(3))Ir(Me)OTf (1) (Cp* = eta(5)-C-5(CH3)(5), OTf = OSO2CF3) reacts cleanly with acetone at room temperature. This reaction results in overall double C-H activation, generating the cationic eta(3)-hydroxyallyl complex Cp*(PMe(3))Ir(eta(3)-CH2C(OH)CH2)(+)OTf(-) (2), Complex 2 was characterized by X-ray diffraction and found to contain a hydrogen-bonded triflate anion. The ultimate product formed on reaction with acetone is strongly dependent upon the nature of the counterion present. Replacement of the triflate ion in 2 with other anions leads to the metallacyclobutanone Cp*(PMe(3))Ir(eta(2)-CH2COCH2), the eta(1)-enolate Cp*(PMe(3))Ir(CH2COCH3)S(p-tolyl) and the free cation salt Cp*(PMe(3))Ir(eta(3)-CH2C(OH)CH2)(+) B(3,5-C6H3(CF3)(2))(4)(-). C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 30 TC 21 Z9 21 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD NOV 29 PY 1995 VL 504 IS 1-2 BP 143 EP 146 DI 10.1016/0022-328X(95)05614-U PG 4 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA TF097 UT WOS:A1995TF09700015 ER PT J AU BARTON, TJ LIN, JB IJADIMAGHSOODI, S POWER, MD ZHANG, XP MA, ZX SHIMIZU, H GORDON, MS AF BARTON, TJ LIN, JB IJADIMAGHSOODI, S POWER, MD ZHANG, XP MA, ZX SHIMIZU, H GORDON, MS TI THERMALLY-INDUCED 1,2-SHIFTS TO CONVERT OLEFINS TO CARBENES - DOES SILICON DO IT - IF SO, WHY NOT CARBON SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MOLECULAR-ORBITAL METHODS; GAUSSIAN-TYPE BASIS; AROMATIC-COMPOUNDS; ELECTRON CORRELATION; ORGANIC-MOLECULES; RING EXPANSION; BASIS SET; REARRANGEMENT; BARRIERS; 9-PHENYL-1(9)-HOMOCUBENE AB Thermal isomerization of olefins to carbenes via a 1,2-silyl shift was examined by both experiment and theory. No evidence of this rearrangement was found for acyclic vinylsilanes, nor could electronic assistance by silicon be identified in cis, trans isomerizations. Serendipitous synthesis of a 2,4-dimethylene-1,3-disilacyclobutane allowed a kinetic examination of its gas-phase, thermal ring expansion to a 2-methylene-1,3-disilacyclobutane. The Arrhenius parameters (log A = 12.48, E(act) = 54.09 kcal/mol) are the first to be reported for an olefin-to-carbene rearrangement. The analogous all-carbon system failed to ring expand. Ab initio calculations revealed that this was opposite to any predictions which would be made from ring strain considerations. Calculations showed that for silyl migration the transition state was late and was actually the carbene, while for carbon migration the TS was early and considerably higher in energy than the resulting carbene. The 2-methylene-1-silacyclobutane rearrangement (ref 5) was reexamined to find that reversible ring opening to a 1,4-diradical occurred at temperatures below those required to ring expand via a carbene TS. C1 IOWA STATE UNIV, US DOE, AMES LAB, AMES, IA 50011 USA. RP BARTON, TJ (reprint author), IOWA STATE UNIV, DEPT CHEM, AMES, IA 50011 USA. NR 57 TC 34 Z9 34 U1 2 U2 5 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 NOV 29 PY 1995 VL 117 IS 47 BP 11695 EP 11703 DI 10.1021/ja00152a010 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA TG899 UT WOS:A1995TG89900010 ER PT J AU RANDALL, DW STURGEON, BE BALL, JA LORIGAN, GA CHAN, MK KLEIN, MP ARMSTRONG, WH BRITT, RD AF RANDALL, DW STURGEON, BE BALL, JA LORIGAN, GA CHAN, MK KLEIN, MP ARMSTRONG, WH BRITT, RD TI MN-55 ESE-ENDOR OF A MIXED-VALENCE MN(III)MN(IV) COMPLEX - COMPARISON WITH THE MN CLUSTER OF THE PHOTOSYNTHETIC OXYGEN-EVOLVING COMPLEX SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ELECTRON-PARAMAGNETIC-RES; BRIDGED MANGANESE COMPLEXES; PHOTOSYSTEM-II; S2 STATE; O-2-EVOLVING COMPLEX; MAGNETIC-PROPERTIES; MODEL COMPLEXES; ACTIVE-SITE; EPR SIGNAL; SPECTROSCOPY AB Analysis of Mn-55 electron spin echo-electron nuclear double resonance (ESE-ENDOR) spectra obtained on a dinuclear mixed valence Mn(III)Mn(IV) complex [di-mu-oxotetrakis(2,2'-bipyridine)dimanganese(III,IV)] (1) reveals the hyperfine and nuclear quadrupolar parameters for the spin I = 5/2 Mn-55 nucleus of both Mn(III) and Mn(IV) ions. The following parameters are obtained: for Mn(IV), A(perpendicular to) = +212 MHz, A(parallel to) = +231 MHz, P-parallel to 3e(2)Qq/40 = +2.0 MHz, and eta = 0.3, and for Mn(III), A perpendicular to = -480 MHz, A(parallel to) -360 MHz, P-parallel to = -4.5 MHz, and eta = 0.1. The Mn-55 ESE-ENDOR data obtained on the g = 2 Mn multiline EPR signal of the S-2 state of the photosystem II oxygen-evolving complex demonstrate that this EPR signal cannot arise from a dinuclear Mn(III)Mn(IV) center. The ENDOR spectra are consistent with a tetranuclear Mn cluster origin for the photosystem II multiline EPR signal. C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. BOSTON COLL,EUGENE F MERKERT CHEM CTR,DEPT CHEM,CHESTNUT HILL,MA 02167. NR 68 TC 105 Z9 105 U1 2 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 29 PY 1995 VL 117 IS 47 BP 11780 EP 11789 DI 10.1021/ja00152a021 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA TG899 UT WOS:A1995TG89900021 ER PT J AU MOORES, DL REED, KJ AF MOORES, DL REED, KJ TI ELECTRON-IMPACT IONIZATION OF HIGHLY-CHARGED URANIUM IONS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article AB Cross sections for electron impact ionization from the 1s and 2s shells of He-like, Li-like and Be-like U ions have been calculated by the relativistic distorted wave method at incident electron energies up to five times the ionization energy. Differences between the results obtained using the Moller and Coulomb interactions are attributed to differences in the contribution from interference between direct and exchange ionization. Excellent agreement is obtained between the Moller result and an EBIT experimental result for He-like U at an incident electron energy of 198 keV. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. RP UCL, DEPT PHYS & ASTRON, LONDON, ENGLAND. NR 10 TC 9 Z9 9 U1 0 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-4075 EI 1361-6455 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 28 PY 1995 VL 28 IS 22 BP 4861 EP 4865 DI 10.1088/0953-4075/28/22/016 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA TJ571 UT WOS:A1995TJ57100016 ER PT J AU SHANNON, MA RUSSO, RE AF SHANNON, MA RUSSO, RE TI LASER-INDUCED STRESSES VERSUS MECHANICAL-STRESS POWER MEASUREMENTS DURING LASER-ABLATION OF SOLIDS SO APPLIED PHYSICS LETTERS LA English DT Article AB Laser-induced stresses resulting from high-power laser-material interactions have been studied extensively. However, the rate of change in mechanical energy, or stress power, due to laser-induced stresses has only recently been investigated. An unanswered question for monitoring laser-material interactions in the far-field is whether stress power differs from stresses measured, particularly with respect to laser-energy coupling to a solid target. This letter shows experimental acoustic data which demonstrate that stress power measured in the far field of the target shows changes in laser-energy coupling, whereas the stresses measured do not. For the ambient medium above the target, stress power and stress together reflect changes in laser-energy coupling. (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SHANNON, MA (reprint author), UNIV ILLINOIS,DEPT MECH & IND ENGN,1206 W GREEN ST,URBANA,IL 61801, USA. NR 14 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 27 PY 1995 VL 67 IS 22 BP 3227 EP 3229 DI 10.1063/1.114880 PG 3 WC Physics, Applied SC Physics GA TF765 UT WOS:A1995TF76500001 ER PT J AU BLUM, O HAFICH, MJ KLEM, JF LEAR, KL CHU, SNG AF BLUM, O HAFICH, MJ KLEM, JF LEAR, KL CHU, SNG TI ELECTRICAL AND OPTICAL CHARACTERISTICS OF ALASSB/GAASSB DISTRIBUTED BRAGG REFLECTORS FOR SURFACE-EMITTING LASERS SO APPLIED PHYSICS LETTERS LA English DT Article ID INP AB We demonstrate an undoped 20 1/2 pair AlAsSb/GaAsSb distributed Bragg reflector (DBR) grown lattice matched to an InP substrate by molecular beam epitaxy. Reflectivity measurements indicate a stop band centered at 1.78 mu m with a maximum reflectivity exceeding 99%. We also measure current-voltage characteristics in a similar 10 1/2 period p-type DBR and find that a current density of 1 kA/cm(2) produces a 2.5 V drop. Hole mobilities and doping concentrations in AlAsSb and GaAsSb are also reported. (C) 1995 American Institute of Physics. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP BLUM, O (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 15 TC 22 Z9 22 U1 1 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 NOV 27 PY 1995 VL 67 IS 22 BP 3233 EP 3235 DI 10.1063/1.114882 PG 3 WC Physics, Applied SC Physics GA TF765 UT WOS:A1995TF76500003 ER PT J AU CALLAHAN, DA AF CALLAHAN, DA TI INTERACTIONS BETWEEN NEIGHBORING BEAMS IN A HEAVY-ION FUSION-REACTOR CHAMBER SO APPLIED PHYSICS LETTERS LA English DT Article AB Multiple beams in a heavy ion fusion reactor chamber can increase the beam spot size at the target. Each beam experiences the field from nearby beams and this field varies along the bunch length. These field variations cause different parts of the beam to be focused at different locations and results in a larger spot size at the target. Calculations show that this is not a large effect for a beam generated by an induction linear accelerator in which the current is nearly constant over much of the pulse. These calculations show 90%-99% of the charge reaches the target for a radiation converter radius that is 10%-20% larger than the beam radius. (C) 1995 American Institute of Physics. RP CALLAHAN, DA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 7 TC 14 Z9 14 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 27 PY 1995 VL 67 IS 22 BP 3254 EP 3256 DI 10.1063/1.114889 PG 3 WC Physics, Applied SC Physics GA TF765 UT WOS:A1995TF76500010 ER PT J AU KURTZ, SR BIEFELD, RM HOWARD, AJ AF KURTZ, SR BIEFELD, RM HOWARD, AJ TI MAGNETOOPTICAL DETERMINATION OF LIGHT-HEAVY HOLE SPLITTINGS IN AS-RICH, INASSB ALLOYS AND SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID STRAIN AB Interband magnetophotoconductive spectroscopy was used to determine the reduced masses of several optical transitions in an InAs1-xSbx/In1-xGaxAs strained-layer superlattice and a superlattice constituent, InAs1-xSbx alloy (x approximate to 0.1). In both the alloy and the superlattice, light and heavy hole transitions were identified. From the light-heavy hole splitting in the superlattice, we estimate the valence band offset and find type I behavior. Effective masses and band gap energy are measured for the CuPt ordered alloy. (C) 1995 American Institute of Physics. RP KURTZ, SR (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 18 TC 14 Z9 15 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 NOV 27 PY 1995 VL 67 IS 22 BP 3331 EP 3333 DI 10.1063/1.115237 PG 3 WC Physics, Applied SC Physics GA TF765 UT WOS:A1995TF76500036 ER PT J AU BURKE, CJ VEIL, JA AF BURKE, CJ VEIL, JA TI SYNTHETIC-BASED DRILLING-FLUIDS HAVE MANY ENVIRONMENTAL PLUSES SO OIL & GAS JOURNAL LA English DT Article RP BURKE, CJ (reprint author), ARGONNE NATL LAB,WASHINGTON,DC, USA. NR 17 TC 4 Z9 4 U1 0 U2 2 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0030-1388 J9 OIL GAS J JI Oil Gas J. PD NOV 27 PY 1995 VL 93 IS 48 BP 59 EP 64 PG 6 WC Energy & Fuels; Engineering, Petroleum SC Energy & Fuels; Engineering GA TG299 UT WOS:A1995TG29900007 ER PT J AU COPI, CJ SCHRAMM, DN TURNER, MS AF COPI, CJ SCHRAMM, DN TURNER, MS TI ASSESSING BIG-BANG NUCLEOSYNTHESIS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PRIMORDIAL NUCLEOSYNTHESIS; DEUTERIUM; ORIGIN AB Systematic uncertainties in the light-element abundances and their evolution complicate a rigorous statistical assessment. However, using Bayesian methods we show that the following statement is robust: The predicted and measured abundances are consistent with 95% credibility only if the baryon-to-photon ratio is between 2 X 10(-10) and 6.5 X 10(-10) and the number of light neutrino species is less than 3.9. Our analysis suggests that the He-4 abundance may have been systematically underestimated. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP COPI, CJ (reprint author), UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637, USA. NR 25 TC 114 Z9 114 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 NOV 27 PY 1995 VL 75 IS 22 BP 3981 EP 3984 DI 10.1103/PhysRevLett.75.3981 PG 4 WC Physics, Multidisciplinary SC Physics GA TF684 UT WOS:A1995TF68400004 ER PT J AU HALL, LJ MURAYAMA, H AF HALL, LJ MURAYAMA, H TI GEOMETRIC MODEL OF THE GENERATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID DISCRETE GAUGE ANOMALIES; QUARK MASSES; SUPERGRAVITY; SYMMETRIES AB We propose a geometric theory of flavor based on the discrete group (S-3)(3), in the context of the minimal supersymmetric standard model. The group treats three objects symmetrically, while making fundamental distinctions between the generations. The top quark is the only heavy quark in the symmetry limit, and the first and second generation squarks are degenerate. The hierarchical nature of Yukawa matrices is a consequence of a sequential breaking of (S-3)(3). C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP HALL, LJ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Murayama, Hitoshi/A-4286-2011 NR 22 TC 135 Z9 135 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 NOV 27 PY 1995 VL 75 IS 22 BP 3985 EP 3988 DI 10.1103/PhysRevLett.75.3985 PG 4 WC Physics, Multidisciplinary SC Physics GA TF684 UT WOS:A1995TF68400005 ER PT J AU MCFARLAND, KS NAPLES, D ARROYO, CG AUCHINCLOSS, P DEBARBARO, P BAZARKO, AO BERNSTEIN, RH BODEK, A BOLTON, T BUDD, H CONRAD, J DRUCKER, RB HARRIS, DA JOHNSON, RA KIM, JH KING, BJ KINNEL, T KOIZUMI, G KOUTSOLIOTAS, S LAMM, MJ LEFMANN, WC MARSH, W MCNULTY, C MISHRA, SR NIENABER, P NUSSBAUM, M OREGLIA, MJ PERERA, L QUINTAS, PZ ROMOSAN, A SAKUMOTO, WK SCHUMM, BA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH SMITH, WH SPENTZOURIS, P STEINER, R STERN, EG VAKILI, M YANG, UK AF MCFARLAND, KS NAPLES, D ARROYO, CG AUCHINCLOSS, P DEBARBARO, P BAZARKO, AO BERNSTEIN, RH BODEK, A BOLTON, T BUDD, H CONRAD, J DRUCKER, RB HARRIS, DA JOHNSON, RA KIM, JH KING, BJ KINNEL, T KOIZUMI, G KOUTSOLIOTAS, S LAMM, MJ LEFMANN, WC MARSH, W MCNULTY, C MISHRA, SR NIENABER, P NUSSBAUM, M OREGLIA, MJ PERERA, L QUINTAS, PZ ROMOSAN, A SAKUMOTO, WK SCHUMM, BA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH SMITH, WH SPENTZOURIS, P STEINER, R STERN, EG VAKILI, M YANG, UK TI LIMITS ON NU(MU)((NU)OVER-BAR-(MU))-]NU(TAU)((NU)OVER-BAR-(TAU)) AND NU(MU)((NU)OVER-BAR-(MU))-]((NU)OVER-BAR-(E))NU(E) OSCILLATIONS FROM A PRECISION-MEASUREMENT OF NEUTRINO-NUCLEON NEUTRAL-CURRENT INTERACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEARCH AB We present limits on nu(mu)<(nu)over bar>(mu)-->nu(tau)(<(nu)over bar>(tau)) and nu(mu)(<(nu)over bar>(mu))-->nu(e)(<(nu)over bar>)(e)) oscillations based on a study of inclusive nu N interactions performed using the CCFR massive coarse-grained detector in the Fermilab Tevatron Quadrupole Triplet neutrino beam. The sensitivity to oscillations is from the difference in the longitudinal energy deposition pattern of nu(mu)N VS nu(tau)N or nu(e)N charged-current interactions. The nu(mu) energies ranged from 30 to 500 GeV with a mean of 140 GeV. The minimum and maximum nu(mu) flight lengths are 0.9 and 1.4 km, respectively. For nu(mu)-->nu(tau) oscillations, the lowest 90% confidence upper limit in sin(2)2 alpha of 2.7 x 10(-3) is obtained at Delta m(2) similar to 50 eV(2). This result is the most stringent limit to date for 25 < Delta m(2) < 90 eV(2). For nu(mu) --> nu(e) oscillations, the lowest 90% confidence upper limit in sin(2)2 alpha of 1.9 X 10(-3) is obtained at Delta m(2) similar to 350 eV(2). This result is the most stringent limit to date for 250 < Delta m(2) < 450 eV(2), and also excludes at 90% confidence much of the high Delta m(2) region favored by the recent LSND observation. C1 ADELPHI UNIV,GARDEN CITY,NY 11530. UNIV CHICAGO,CHICAGO,IL 60637. UNIV CINCINNATI,CINCINNATI,OH 45221. COLUMBIA UNIV,NEW YORK,NY 10027. KANSAS STATE UNIV,MANHATTAN,KS 66506. UNIV OREGON,EUGENE,OR 97403. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV WISCONSIN,MADISON,WI 53706. XAVIER UNIV,CINCINNATI,OH 45207. RP MCFARLAND, KS (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 29 TC 60 Z9 60 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 27 PY 1995 VL 75 IS 22 BP 3993 EP 3996 DI 10.1103/PhysRevLett.75.3993 PG 4 WC Physics, Multidisciplinary SC Physics GA TF684 UT WOS:A1995TF68400007 ER PT J AU ABE, F AKIMOTO, H AKOPIAN, A ALBROW, MG AMENDOLIA, SR AMIDEI, D ANTOS, J ANWAYWIESE, C AOTA, S APOLLINARI, G ASAKAWA, T ASHMANSKAS, W ATAC, M AUCHINCLOSS, P AZFAR, F AZZIBACCHETTA, P BACCHETTA, N BADGETT, W BAGDASAROV, S BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOKHARI, W BOLOGNESI, V BORTOLETTO, D BOUDREAU, J BRECCIA, L BROMBERG, C BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMMERATA, J CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CAUZ, D CEN, Y CERVELLI, F CHAO, HY CHAPMAN, J CHENG, MT CHIARELLI, G CHIKAMATSU, T CHIOU, CN CHRISTOFEK, L CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M CONWAY, J COOPER, J CORDELLI, M COUYOUMTZELIS, C CRANE, D CRONINHENNESSY, D CULBERTSON, R CUNNINGHAM, JD DANIELS, T DEJONGH, F DELCHAMPS, S DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DITTMANN, JR DONATI, S DONE, J DRUCKER, RB DUNN, A EDDY, N EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ERREDE, D ERREDE, S FAN, Q FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FUESS, TA FUKUI, Y FUNAKI, S GAGLIARDI, G GALEOTTI, S GALLINARO, M GARCIASCIVERES, M GARFINKEL, AF GAY, C GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GROER, L GROSSOPILCHER, C GUILLIAN, G GUO, RS HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARDMAN, AD HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HAYASHI, E HEINRICH, J HOFFMAN, KD HOHLMANN, M HOLCK, C HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HUSTON, J HUTH, J HYLEN, J IKEDA, H INCAGLI, M INCANDELA, J IWAI, J IWATA, Y JENSEN, H JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARR, K KASHA, H KATO, Y KEEBLE, L KELLEY, K KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, BJ KIM, DH KIM, HS KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KOWALD, W KRASBERG, M KROLL, J KRUSE, M KUWABARA, T KUHLMANN, SE KUNS, E LAASANEN, AT LABANCA, N LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LOOMIS, C LORETI, M LU, J LUCCHESI, D LUKENS, P LUSIN, S LYS, J MAESHIMA, K MAGHAKIAN, A MAKSIMOVIC, P MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E METZLER, S MIAO, C MICHAIL, G MIKAMO, S MILLER, R MINATO, H MISCETTI, S MISHINA, M MITSUSHIO, H MIYAMOTO, T MIYASHITA, S MORITA, Y MUELLER, J MUKHERJEE, A MULLER, T MURAT, P NAKADA, H NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NINOMIYA, M NODULMAN, L OH, SH OHL, KE OHMOTO, T OHSUGI, T OISHI, R OKABE, M OKUSAWA, T OLIVER, R OLSEN, J PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PAPPAS, SP PARK, S PATRICK, J PAULETTA, G PAULINI, M PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PITTS, KT PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIBON, A RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L ROSER, R SAKUMOTO, WK SALTZBERG, D SANTI, L SATO, H SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SGOLACCHIA, A SHAPIRO, MD SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, T SPALDING, J SPHICAS, P SPIROPULU, M SPIEGEL, L SPIES, A STANCO, L STEELE, J STEFANINI, A STRAHL, K STRAIT, J STROEHMER, R STUART, D SULLIVAN, G SOUMAROKOV, A SUMOROK, K SUZUKI, J TAKADA, T TAKAHASHI, T TAKANO, T TAKIKAWA, K TAMURA, N TARTARELLI, F TAYLOR, W TENG, PK TERAMOTO, Y TETHER, S THERIOT, D THOMAS, TL THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOBACK, D TOLLEFSON, K TOLLESTRUP, A TONNISON, J DETROCONIZ, JF TRUITT, S TSENG, J TURINI, N UCHIDA, T UEMURA, N UKEGAWA, F UNAL, G VANDENBRINK, SC VEJCIK, S VELEV, G VIDAL, R VONDRACEK, M VUCINIC, D WAGNER, RG WAGNER, RL WAHL, J WALKER, RC WANG, C WANG, CH WANG, G WANG, J WANG, MJ WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WEI, C WENDT, C WENZEL, H WESTER, WC WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WILSON, P WINER, BL WOLINSKI, D WOLINSKI, J WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YEH, P YIN, M YOH, J YOSEF, C YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, L ZHANG, W ZUCCHELLI, S AF ABE, F AKIMOTO, H AKOPIAN, A ALBROW, MG AMENDOLIA, SR AMIDEI, D ANTOS, J ANWAYWIESE, C AOTA, S APOLLINARI, G ASAKAWA, T ASHMANSKAS, W ATAC, M AUCHINCLOSS, P AZFAR, F AZZIBACCHETTA, P BACCHETTA, N BADGETT, W BAGDASAROV, S BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOKHARI, W BOLOGNESI, V BORTOLETTO, D BOUDREAU, J BRECCIA, L BROMBERG, C BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMMERATA, J CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CAUZ, D CEN, Y CERVELLI, F CHAO, HY CHAPMAN, J CHENG, MT CHIARELLI, G CHIKAMATSU, T CHIOU, CN CHRISTOFEK, L CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M CONWAY, J COOPER, J CORDELLI, M COUYOUMTZELIS, C CRANE, D CRONINHENNESSY, D CULBERTSON, R CUNNINGHAM, JD DANIELS, T DEJONGH, F DELCHAMPS, S DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DITTMANN, JR DONATI, S DONE, J DRUCKER, RB DUNN, A EDDY, N EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ERREDE, D ERREDE, S FAN, Q FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FUESS, TA FUKUI, Y FUNAKI, S GAGLIARDI, G GALEOTTI, S GALLINARO, M GARCIASCIVERES, M GARFINKEL, AF GAY, C GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GROER, L GROSSOPILCHER, C GUILLIAN, G GUO, RS HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARDMAN, AD HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HAYASHI, E HEINRICH, J HOFFMAN, KD HOHLMANN, M HOLCK, C HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HUSTON, J HUTH, J HYLEN, J IKEDA, H INCAGLI, M INCANDELA, J IWAI, J IWATA, Y JENSEN, H JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARR, K KASHA, H KATO, Y KEEBLE, L KELLEY, K KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, BJ KIM, DH KIM, HS KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KOWALD, W KRASBERG, M KROLL, J KRUSE, M KUWABARA, T KUHLMANN, SE KUNS, E LAASANEN, AT LABANCA, N LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LOOMIS, C LORETI, M LU, J LUCCHESI, D LUKENS, P LUSIN, S LYS, J MAESHIMA, K MAGHAKIAN, A MAKSIMOVIC, P MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E METZLER, S MIAO, C MICHAIL, G MIKAMO, S MILLER, R MINATO, H MISCETTI, S MISHINA, M MITSUSHIO, H MIYAMOTO, T MIYASHITA, S MORITA, Y MUELLER, J MUKHERJEE, A MULLER, T MURAT, P NAKADA, H NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NINOMIYA, M NODULMAN, L OH, SH OHL, KE OHMOTO, T OHSUGI, T OISHI, R OKABE, M OKUSAWA, T OLIVER, R OLSEN, J PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PAPPAS, SP PARK, S PATRICK, J PAULETTA, G PAULINI, M PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PITTS, KT PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIBON, A RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L ROSER, R SAKUMOTO, WK SALTZBERG, D SANTI, L SATO, H SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SGOLACCHIA, A SHAPIRO, MD SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, T SPALDING, J SPHICAS, P SPIROPULU, M SPIEGEL, L SPIES, A STANCO, L STEELE, J STEFANINI, A STRAHL, K STRAIT, J STROEHMER, R STUART, D SULLIVAN, G SOUMAROKOV, A SUMOROK, K SUZUKI, J TAKADA, T TAKAHASHI, T TAKANO, T TAKIKAWA, K TAMURA, N TARTARELLI, F TAYLOR, W TENG, PK TERAMOTO, Y TETHER, S THERIOT, D THOMAS, TL THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOBACK, D TOLLEFSON, K TOLLESTRUP, A TONNISON, J DETROCONIZ, JF TRUITT, S TSENG, J TURINI, N UCHIDA, T UEMURA, N UKEGAWA, F UNAL, G VANDENBRINK, SC VEJCIK, S VELEV, G VIDAL, R VONDRACEK, M VUCINIC, D WAGNER, RG WAGNER, RL WAHL, J WALKER, RC WANG, C WANG, CH WANG, G WANG, J WANG, MJ WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WEI, C WENDT, C WENZEL, H WESTER, WC WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WILSON, P WINER, BL WOLINSKI, D WOLINSKI, J WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YEH, P YIN, M YOH, J YOSEF, C YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, L ZHANG, W ZUCCHELLI, S TI STUDY OF T(T)OVER-BAR PRODUCTION IN P(P)OVER-BAR COLLISIONS USING TOTAL TRANSVERSE ENERGY SO PHYSICAL REVIEW LETTERS LA English DT Article AB We analyze a sample of W + jet events collected with the Collider Detector at Fermilab (CDF) in p (p) over bar collisions at root s = 1.8 TeV to study t (t) over bar production. We employ a simple kinematical variable H, defined as the scalar sum of the transverse energies of the lepton, neutrino, and jets. For events with a W boson and four or more jets, the shape of the H distribution deviates by 3.8 standard deviations from that expected from known backgrounds to t (t) over bar production. However, this distribution agrees well with a linear combination of background and t (t) over bar events, the agreement being best for a top mass of 180 GeV/c(2). C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27708. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. HIROSHIMA UNIV,HIGASHIHIROSHIMA 724,JAPAN. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ H3A 2T8,CANADA. UNIV TORONTO,TORONTO,ON M5S 1A7,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. OSAKA CITY UNIV,OSAKA 588,JAPAN. UNIV PADUA,IST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. ACAD SINICA,TAIPEI 11529,TAIWAN. TEXAS A&M UNIV,COLLEGE STN,TX 77843. TEXAS TECH UNIV,LUBBOCK,TX 79409. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,1-1 OHO,TSUKUBA,IBARAKI 305,JAPAN. RI Vucinic, Dejan/C-2406-2008; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Paulini, Manfred/N-7794-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787 NR 12 TC 24 Z9 24 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 27 PY 1995 VL 75 IS 22 BP 3997 EP 4002 DI 10.1103/PhysRevLett.75.3997 PG 6 WC Physics, Multidisciplinary SC Physics GA TF684 UT WOS:A1995TF68400008 ER PT J AU Serebrov, AP Mityukhlyaev, VA Zakharov, AA Kharitonov, AG Nesvizhevskii, VV Lasakov, MS Taldaev, RR Aldushchenkov, AV Varlamov, VE Vasilev, AV Greene, G Bowles, T AF Serebrov, AP Mityukhlyaev, VA Zakharov, AA Kharitonov, AG Nesvizhevskii, VV Lasakov, MS Taldaev, RR Aldushchenkov, AV Varlamov, VE Vasilev, AV Greene, G Bowles, T TI Experimental study of a solid-deuterium source of ultracold neutrons SO JETP LETTERS LA English DT Article AB The results of experimental studies of the emergence of ultracold neutrons (UCN) from solid deuterium, which were performed on a model source in the BBR-M reactor at the St. Petersburg Institute of Nuclear Physics, are reported. The temperature gain factor in the UCN yield at 13-14 K from solid deuterium relative to to the UCN yield at room temperature from a gaseous state is equal to 1230 and 550 at solid-deuterium temperature of 18.7 K (triple point). (C) 1995 American Institute of Physics. C1 NATL INST STAND & TECHNOL,WASHINGTON,DC. LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. RP Serebrov, AP (reprint author), RUSSIAN ACAD SCI,ST PETERSBURG INST NUCL PHYS,GATCHINA 188350,RUSSIA. NR 3 TC 22 Z9 22 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-3640 J9 JETP LETT+ JI Jetp Lett. PD NOV 25 PY 1995 VL 62 IS 10 BP 785 EP 790 PG 6 WC Physics, Multidisciplinary SC Physics GA TR001 UT WOS:A1995TR00100004 ER PT J AU Feigelman, MV Geshkenbein, VB Larkin, AI Vinokur, VM AF Feigelman, MV Geshkenbein, VB Larkin, AI Vinokur, VM TI Sign change of the flux-flow Hall effect in HTSC SO JETP LETTERS LA English DT Article ID II SUPERCONDUCTORS; VORTEX AB A novel mechanism for the sign change of the flux-flow Hall effect is proposed. The dependence of the superconducting thermodynamic potential Omega(sc) on the chemical potential mu produces a topological contribution to to the Hall conductivity delta sigma(xy)=-(partial derivative Omega(sc)/partial derivative mu)ec/B, which may lead to a double sign change of the Hall effect as a function of temperature. (C) 1995 American Institute of Physics. C1 ETH HONGGERBERG, CH-8093 ZURICH, SWITZERLAND. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP LD LANDAU THEORET PHYS INST, KOSYGINA 2, MOSCOW 117940, RUSSIA. RI Feigelman, Mikhail/M-4113-2013 NR 25 TC 61 Z9 61 U1 0 U2 3 PU MAIK NAUKA/INTERPERIODICA/SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013-1578 USA SN 0021-3640 EI 1090-6487 J9 JETP LETT+ JI Jetp Lett. PD NOV 25 PY 1995 VL 62 IS 10 BP 834 EP 840 PG 7 WC Physics, Multidisciplinary SC Physics GA TR001 UT WOS:A1995TR00100012 ER PT J AU Bell, AT AF Bell, AT TI The influence of metal oxides on the activity and selectivity of transition metal catalysts SO JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL LA English DT Article DE activity; metal oxides; selectivity; transition metal catalysts ID RH FOIL; TITANIA OVERLAYERS; SUPPORT INTERACTIONS; ELECTRON-MICROSCOPY; RHODIUM CATALYSTS; CO HYDROGENATION; CARBON-MONOXIDE; CHEMISORPTION; METHANATION; PLATINUM AB The catalytic activity and selectivity of transition metals are known to be affected by metal oxides deposited on their surface. Such deposits can result from the transfer of portions of the support during catalyst preparation or be introduced intentionally. The structure and composition of both monolayer and multilayer deposits of metal oxides on Ph and Pt are discussed and the effects of oxide composition and coverage on the rate of CO and CO2 hydrogenation are examined. It is shown that the effectiveness of an oxide correlates with its Lewis acidity, and that the later property can be described by the Pauling electronegativity of the cations in the oxide. The effects of oxide deposits on other reactions are also reviewed. C1 UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, LAWRENCE BERKLEY NATL LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 57 TC 26 Z9 26 U1 1 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-1169 EI 1873-314X J9 J MOL CATAL A-CHEM JI J. Mol. Catal. A-Chem. PD NOV 23 PY 1995 VL 100 IS 1-3 BP 1 EP 11 DI 10.1016/1381-1169(95)00132-8 PG 11 WC Chemistry, Physical SC Chemistry GA TL514 UT WOS:A1995TL51400002 ER PT J AU Lowenthal, EE Allard, LF Te, M Foley, HC AF Lowenthal, EE Allard, LF Te, M Foley, HC TI Evidence for kinetic and oxidative stabilization of Rh on Mo-promoted Rh/Al2O3 SO JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL LA English DT Article DE carbon monoxide; bimetallic catalysts; rhodium; molybdenum; supported catalysts; gamma-alumina; chemisorption; surface modification; hydrogen; carbon monoxide; high-resolution transmission electron microscopy; image processing ID CO HYDROGENATION; CARBON-MONOXIDE; SUPPORTED RHODIUM; RH/SIO2 CATALYSTS; CLUSTERS; SILICA; CRYSTALLITES; PROTECTION; PRECURSOR; REDUCTION AB Carbon monoxide hydrogenation studies on silica- and alumina-supported Rh catalysts conducted in our laboratories as well as those reported in the literature suggest that the addition of early transition-metal oxides to the catalyst surface exerts a promotional influence on active Rh centers, This promotion leads to enhanced oxygenate selectivity. Explanations of the promotional influence of the early transition-metal oxides fall into three categories: (i) kinetic stabilization of small Rh aggregates, (ii) wetting and spreading of the transition-metal oxide, leading to decoration of the surface of Rh crystallites, and (iii) oxidative stabilization of Rh aggregates, altering Rh interactions with sub-carbonyls during reaction. Characterization of the Rh-Mo/gamma-Al2O3 system provides supporting evidence for both kinetic stabilization and oxidative stabilization of Rh aggregates and suggests that these processes contribute to the enhanced oxygenate selectivity of these materials. Hydrogen and carbon monoxide chemisorption results provide evidence for highly dispersed and oxidatively stabilized Rh aggregates. Even after extended on-stream testing (> 10 h), where metal aggregation is unavoidable, high-resolution transmission electron microscopy, associated energy dispersive spectroscopy, and the use of fast-Fourier transform post-processing to produce optical diffractograms highlight differences in the metal-aggregate morphology. C1 UNIV DELAWARE,CTR CATALYT SCI & TECHNOL,DEPT CHEM ENGN,NEWARK,DE 19716. OAK RIDGE NATL LAB,CTR MAT ANAL USER,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. NR 38 TC 12 Z9 12 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-1169 J9 J MOL CATAL A-CHEM JI J. Mol. Catal. A-Chem. PD NOV 23 PY 1995 VL 100 IS 1-3 BP 129 EP 145 DI 10.1016/1381-1169(95)00177-8 PG 17 WC Chemistry, Physical SC Chemistry GA TL514 UT WOS:A1995TL51400012 ER PT J AU RUSSO, TV MARTIN, RL HAY, PJ AF RUSSO, TV MARTIN, RL HAY, PJ TI EFFECTIVE CORE POTENTIALS FOR DFT CALCULATIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID RELATIVISTIC EFFECTIVE POTENTIALS; DENSITY-FUNCTIONAL THEORY; SPIN-ORBIT OPERATORS; MOLECULAR CALCULATIONS; BASIS-SETS; ATOMS; PSEUDOPOTENTIALS; EXCHANGE; APPROXIMATION; ENERGIES AB Effective core potentials have been generated for Ti and Ni using atomic density functional theory (DFT) wave functions within the local density approximation. We find that these effective potentials give good agreement between all-electron and valence-electron calculations in TiF4 and Ni(CO)(4) for both the local-density (S-VWN) and the gradient-corrected (B-LYP) approximation. Furthermore, we demonstrate for a small but representative set of transition metal complexes that the effective core potentials generated previously from Hartree-Fock atomic calculations may be used in DFT-based methods as well. RP RUSSO, TV (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B268,LOS ALAMOS,NM 87545, USA. NR 49 TC 128 Z9 129 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 23 PY 1995 VL 99 IS 47 BP 17085 EP 17087 DI 10.1021/j100047a007 PG 3 WC Chemistry, Physical SC Chemistry GA TF811 UT WOS:A1995TF81100007 ER PT J AU HEINTZ, RA KOETZLE, TF OSTRANDER, RL RHEINGOLD, AL THEOPOLD, KH WU, P AF HEINTZ, RA KOETZLE, TF OSTRANDER, RL RHEINGOLD, AL THEOPOLD, KH WU, P TI UNUSUALLY STRONG INTRAMOLECULAR MAGNETIC COUPLING IN A CHROMIUM HYDRIDE CLUSTER SO NATURE LA English DT Article ID MOLECULAR-BASED MAGNETS; GROUND-STATE; METAL-COMPLEXES; SPIN; TRIHYDRIDE AB MOLECULES With large spins, and associated large magnetic moments, are potential building blocks for magnetic materials(1). To make such molecules, spin-carrying metal ions can be assembled into polynuclear complexes, but the coupling between the spins is usually antiferromagnetic, leading to antiparallel alignment(2). Magnetic coupling leading to parallel alignment occurs only rarely, and even then is usually too weak for the alignment to persist at ambient temperatures(3-14). Here we report the synthesis of a tetranuclear chromium hydride cluster With a ground state of non-zero spin (spin quantum number S = 7/2), in which the intramolecular magnetic coupling is so strong that the magnetic alignment is not disturbed appreciably even at room temperature. This ground state cannot be explained either by simple parallel or antiparallel alignment of spins, but can be understood in terms of antiparallel alignment of three Cr(III) moments with one Cr(II) moment, These findings indicate that hydride ligands can mediate extremely strong magnetic exchange interactions between metal ions, and that metal hydrides may therefore be promising components for the construction of molecular magnetic materials. C1 UNIV DELAWARE,DEPT CHEM & BIOCHEM,NEWARK,DE 19716. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Theopold, Klaus/B-4059-2011 OI Theopold, Klaus/0000-0001-5168-1625 NR 33 TC 21 Z9 21 U1 2 U2 8 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 23 PY 1995 VL 378 IS 6555 BP 359 EP 362 DI 10.1038/378359a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TF893 UT WOS:A1995TF89300048 ER PT J AU DERRICK, M KRAKAUER, D MAGILL, S MIKUNAS, D MUSGRAVE, B REPOND, J STANEK, R TALAGA, RL ZHANG, H 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 CONTIN, A CORRADI, M GIALAS, I GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F POLINI, A SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A BORNHEIM, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T ECKERT, M FELD, L FREY, A GEERTS, M GROTHE, M HARTMANN, H HEINLOTH, K HILGER, E JAKOB, HP KATZ, UF MENGEL, S MOLLEN, J PAUL, E PFEIFFER, M REMBSER, C SCHRAMM, D STAMM, J WEDEMEYER, R CAMPBELLROBSON, S CASSIDY, A COTTINGHAM, WN DYCE, N FOSTER, B GEORGE, S HAYES, ME HEATH, GP HEATH, HF MORGADO, CJS OMARA, JA PICCIONI, D ROFF, DG TAPPER, RJ YOSHIDA, R RAU, RR ARNEODO, M CAPUA, M GARFAGNINI, A IANNOTTI, L SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A CARTIGLIA, N PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S ZHU, Q BORZEMSKI, P CHWASTOWSKI, J ESKREYS, A PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BEIER, H BIENLEIN, JK COLDEWEY, C DEPPE, O DESLER, K DREWS, G FLASINSKI, M GILKINSON, DJ GLASMAN, C GOTTLICHER, P GROSSEKNETTER, J GUTJAHR, B HAAS, T HAIN, W HASELL, D HESSLING, H IGA, Y JOHNSON, KF JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MONTEIRO, T NG, JST NICKEL, S NOTZ, D OHRENBERG, K ROCO, M ROHDE, M ROLDAN, J SCHNEEKLOTH, U SCHULZ, W SELONKE, F STILIARIS, E SURROW, B VOSS, T WESTPHAL, D WOLF, G YOUNGMAN, C ZEUNER, W ZHOU, JF GRABOSCH, HJ KHARCHILAVA, A LEICH, A MATTINGLY, MCK MARI, SM MEYER, A SCHLENSTEDT, S WULFF, N BARBAGLI, G PELFER, P ANZIVINO, G MACCARRONE, G DEPASQUALE, S VOTANO, L BAMBERGER, A EISENHARDT, S FREIDHOF, A SOLDNERREMBOLD, S SCHROEDER, J TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT SAXON, DH UTLEY, ML WILSON, AS DANNENMANN, A HOLM, U HORSTMANN, D NEUMANN, T SINKUS, R WICK, K BADURA, E BUROW, BD HAGGE, L LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W ZETSCHE, F BACON, TC BRUEMMER, N BUTTERWORTH, I GALLO, E HARRIS, VL HUNG, BYH LONG, KR MILLER, DB MORAWITZ, PPO PRINIAS, A SEDGBEER, JK WHITFIELD, AF MALLIK, U MCCLIMENT, E WANG, MZ WANG, SM WU, JT CLOTH, P FILGES, D AN, SH HONG, SM NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G FERNANDEZ, JP GRACIANI, R HERNANDEZ, JM HERVAS, L LABARGA, L MARTINEZ, M DELPESO, J PUGA, J TERRON, J DETROCONIZ, JF SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIN, JN MATTHEWS, CG PATEL, PM SINCLAIR, LW STAIRS, DG STLAURENT, M ULLMANN, R ZACEK, G BASHKIROV, V DOLGOSHEIN, BA STIFUTKIN, A BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KOBRIN, VD KORZHAVINA, IA KUZMIN, VA LUKINA, OY PROSKURYAKOV, AS SAVIN, AA SHCHEGLOVA, LM SOLOMIN, AN ZOTOV, NP BOTJE, M CHLEBANA, F DAKE, A ENGELEN, J DEKAMPS, M KOOIJMAN, P KRUSE, A TIECKE, H VERKERKE, W VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R ACOSTA, D BYLSMA, B DURKIN, LS GILMORE, J HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN NYLANDER, P PARK, IH ROMANOWSKI, TA SEIDLEIN, R BAILEY, DS BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE HARNEW, N LANCASTER, M LINDEMANN, L MCFALL, JD NATH, C NOYES, VA QUADT, A TICKNER, JR UIJTERWAAL, H WALCZAK, R WATERS, DS WILSON, FF YIP, T ABBIENDI, G BERTOLIN, A BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BULMAHN, J BUTTERWORTH, JM FEILD, RG OH, BY OKRASINSKI, JR WHITMORE, JJ DAGOSTINI, G MARINI, G NIGRO, A TASSI, E HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E DUBBS, T HEUSCH, C VANHOOK, M LOCKMAN, W RAHN, JT SADROZINSKI, HFW SEIDEN, A WILLIAMS, DC BILTZINGER, J SEIFERT, RJ SCHWARZER, O WALENTA, AH ZECH, G ABRAMOWICZ, H BRISKIN, G DAGAN, S HANDELPIKIELNY, C LEVY, A FLECK, JI HASEGAWA, T HAZUMI, M ISHII, T KUZE, M MINE, S NAGASAWA, Y NAKAO, M SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAKAMITSU, Y YAMAUCHI, K CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SACCHI, R SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BRKIC, M GINGRICH, DM HARTNER, GF JOO, KK LEVMAN, GM MARTIN, JF ORR, RS POLENZ, S SAMPSON, CR TEUSCHER, RJ CATTERALL, CD JONES, TW KAZIEWICZ, PB LANE, JB SAUNDERS, RL SHULMAN, J BLANKENSHIP, K LU, B MO, LW BOGUSZ, W CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM TYMIENIECKA, T WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M EISENBERG, Y KARSHON, U REVEL, D ZERZION, D ALI, I BADGETT, WF BEHRENS, B DASU, S FORDHAM, C FOUDAS, C GOUSSIOU, A LOVELESS, RJ REEDER, DD SILVERSTEIN, S SMITH, WH VAICIULIS, A WODARCZYK, M TSURUGAI, T BHADRA, S CARDY, ML FAGERSTROEM, CP FRISKEN, WR FURUTANI, KM KHAKZAD, M SCHMIDKE, WB AF DERRICK, M KRAKAUER, D MAGILL, S MIKUNAS, D MUSGRAVE, B REPOND, J STANEK, R TALAGA, RL ZHANG, H 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 CONTIN, A CORRADI, M GIALAS, I GIUSTI, P IACOBUCCI, G LAURENTI, G LEVI, G MARGOTTI, A MASSAM, T NANIA, R NEMOZ, C PALMONARI, F POLINI, A SARTORELLI, G TIMELLINI, R GARCIA, YZ ZICHICHI, A BARGENDE, A BORNHEIM, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T ECKERT, M FELD, L FREY, A GEERTS, M GROTHE, M HARTMANN, H HEINLOTH, K HILGER, E JAKOB, HP KATZ, UF MENGEL, S MOLLEN, J PAUL, E PFEIFFER, M REMBSER, C SCHRAMM, D STAMM, J WEDEMEYER, R CAMPBELLROBSON, S CASSIDY, A COTTINGHAM, WN DYCE, N FOSTER, B GEORGE, S HAYES, ME HEATH, GP HEATH, HF MORGADO, CJS OMARA, JA PICCIONI, D ROFF, DG TAPPER, RJ YOSHIDA, R RAU, RR ARNEODO, M CAPUA, M GARFAGNINI, A IANNOTTI, L SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A CARTIGLIA, N PARSONS, JA RITZ, S SCIULLI, F STRAUB, PB WAI, L YANG, S ZHU, Q BORZEMSKI, P CHWASTOWSKI, J ESKREYS, A PIOTRZKOWSKI, K ZACHARA, M ZAWIEJSKI, L ADAMCZYK, L BEDNAREK, B JELEN, K KISIELEWSKA, D KOWALSKI, T RULIKOWSKAZAREBSKA, E SUSZYCKI, L ZAJAC, J KOTANSKI, A PRZYBYCIEN, M BAUERDICK, LAT BEHRENS, U BEIER, H BIENLEIN, JK COLDEWEY, C DEPPE, O DESLER, K DREWS, G FLASINSKI, M GILKINSON, DJ GLASMAN, C GOTTLICHER, P GROSSEKNETTER, J GUTJAHR, B HAAS, T HAIN, W HASELL, D HESSLING, H IGA, Y JOHNSON, KF JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MAINUSCH, J MANCZAK, O MONTEIRO, T NG, JST NICKEL, S NOTZ, D OHRENBERG, K ROCO, M ROHDE, M ROLDAN, J SCHNEEKLOTH, U SCHULZ, W SELONKE, F STILIARIS, E SURROW, B VOSS, T WESTPHAL, D WOLF, G YOUNGMAN, C ZEUNER, W ZHOU, JF GRABOSCH, HJ KHARCHILAVA, A LEICH, A MATTINGLY, MCK MARI, SM MEYER, A SCHLENSTEDT, S WULFF, N BARBAGLI, G PELFER, P ANZIVINO, G MACCARRONE, G DEPASQUALE, S VOTANO, L BAMBERGER, A EISENHARDT, S FREIDHOF, A SOLDNERREMBOLD, S SCHROEDER, J TREFZGER, T BROOK, NH BUSSEY, PJ DOYLE, AT SAXON, DH UTLEY, ML WILSON, AS DANNENMANN, A HOLM, U HORSTMANN, D NEUMANN, T SINKUS, R WICK, K BADURA, E BUROW, BD HAGGE, L LOHRMANN, E MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W ZETSCHE, F BACON, TC BRUEMMER, N BUTTERWORTH, I GALLO, E HARRIS, VL HUNG, BYH LONG, KR MILLER, DB MORAWITZ, PPO PRINIAS, A SEDGBEER, JK WHITFIELD, AF MALLIK, U MCCLIMENT, E WANG, MZ WANG, SM WU, JT CLOTH, P FILGES, D AN, SH HONG, SM NAM, SW PARK, SK SUH, MH YON, SH IMLAY, R KARTIK, S KIM, HJ MCNEIL, RR METCALF, W NADENDLA, VK BARREIRO, F CASES, G FERNANDEZ, JP GRACIANI, R HERNANDEZ, JM HERVAS, L LABARGA, L MARTINEZ, M DELPESO, J PUGA, J TERRON, J DETROCONIZ, JF SMITH, GR CORRIVEAU, F HANNA, DS HARTMANN, J HUNG, LW LIN, JN MATTHEWS, CG PATEL, PM SINCLAIR, LW STAIRS, DG STLAURENT, M ULLMANN, R ZACEK, G BASHKIROV, V DOLGOSHEIN, BA STIFUTKIN, A BASHINDZHAGYAN, GL ERMOLOV, PF GLADILIN, LK GOLUBKOV, YA KOBRIN, VD KORZHAVINA, IA KUZMIN, VA LUKINA, OY PROSKURYAKOV, AS SAVIN, AA SHCHEGLOVA, LM SOLOMIN, AN ZOTOV, NP BOTJE, M CHLEBANA, F DAKE, A ENGELEN, J DEKAMPS, M KOOIJMAN, P KRUSE, A TIECKE, H VERKERKE, W VREESWIJK, M WIGGERS, L DEWOLF, E VANWOUDENBERG, R ACOSTA, D BYLSMA, B DURKIN, LS GILMORE, J HONSCHEID, K LI, C LING, TY MCLEAN, KW MURRAY, WN NYLANDER, P PARK, IH ROMANOWSKI, TA SEIDLEIN, R BAILEY, DS BYRNE, A CASHMORE, RJ COOPERSARKAR, AM DEVENISH, RCE HARNEW, N LANCASTER, M LINDEMANN, L MCFALL, JD NATH, C NOYES, VA QUADT, A TICKNER, JR UIJTERWAAL, H WALCZAK, R WATERS, DS WILSON, FF YIP, T ABBIENDI, G BERTOLIN, A BRUGNERA, R CARLIN, R DALCORSO, F DEGIORGI, M DOSSELLI, U LIMENTANI, S MORANDIN, M POSOCCO, M STANCO, L STROILI, R VOCI, C BULMAHN, J BUTTERWORTH, JM FEILD, RG OH, BY OKRASINSKI, JR WHITMORE, JJ DAGOSTINI, G MARINI, G NIGRO, A TASSI, E HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E DUBBS, T HEUSCH, C VANHOOK, M LOCKMAN, W RAHN, JT SADROZINSKI, HFW SEIDEN, A WILLIAMS, DC BILTZINGER, J SEIFERT, RJ SCHWARZER, O WALENTA, AH ZECH, G ABRAMOWICZ, H BRISKIN, G DAGAN, S HANDELPIKIELNY, C LEVY, A FLECK, JI HASEGAWA, T HAZUMI, M ISHII, T KUZE, M MINE, S NAGASAWA, Y NAKAO, M SUZUKI, I TOKUSHUKU, K YAMADA, S YAMAZAKI, Y CHIBA, M HAMATSU, R HIROSE, T HOMMA, K KITAMURA, S NAKAMITSU, Y YAMAUCHI, K CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SACCHI, R SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BRKIC, M GINGRICH, DM HARTNER, GF JOO, KK LEVMAN, GM MARTIN, JF ORR, RS POLENZ, S SAMPSON, CR TEUSCHER, RJ CATTERALL, CD JONES, TW KAZIEWICZ, PB LANE, JB SAUNDERS, RL SHULMAN, J BLANKENSHIP, K LU, B MO, LW BOGUSZ, W CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM TYMIENIECKA, T WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M EISENBERG, Y KARSHON, U REVEL, D ZERZION, D ALI, I BADGETT, WF BEHRENS, B DASU, S FORDHAM, C FOUDAS, C GOUSSIOU, A LOVELESS, RJ REEDER, DD SILVERSTEIN, S SMITH, WH VAICIULIS, A WODARCZYK, M TSURUGAI, T BHADRA, S CARDY, ML FAGERSTROEM, CP FRISKEN, WR FURUTANI, KM KHAKZAD, M SCHMIDKE, WB TI MEASUREMENT OF ALPHA(S) FROM JET RATES IN DEEP-INELASTIC SCATTERING AT HERA SO PHYSICS LETTERS B LA English DT Article ID PROTON SCATTERING; EVENT GENERATOR; CROSS-SECTIONS; MONTE-CARLO; QCD JETS; ZEUS; CALORIMETER; FRAGMENTATION; DEPENDENCE; ENERGIES AB Jet production in deep inelastic scattering for 120 < Q(2) < 3600 GeV2 has been studied using data from an integrated luminosity of 3.2 pb(-1) collected with the ZEUS detector at HERA. Jets are identified with the JADE algorithm. A cut on the angular distribution of parton emission in the gamma(8)-parton centre-of-mass system minimises the experimental and theoretical uncertainties in the determination of the jet rates. The jet rates, when compared to O(alpha(s)(2)) perturbative QCD calculations, allow a precise determination of alpha(s)(Q) in three Q(2)-intervals. The values are consistent with a running of alpha(s)(Q), as expected from QCD. Extrapolating to Q = M(Z0) yields alpha(s)(M(Z0)) = 0.117 +/- 0.005 (stat)(-0.005)(+0.004) (syst(exp)) +/- 0.007 (syst(theory)). C1 UNIV BOLOGNA, I-40126 BOLOGNA, ITALY. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. UNIV BONN, INST PHYS, W-5300 BONN, GERMANY. UNIV BRISTOL, HH WILLS PHYS LAB, BRISTOL BS8 1TH, AVON, ENGLAND. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. COLUMBIA UNIV, NEVIS LABS, IRVINGTON, NY USA. INST NUCL PHYS, KRAKOW, POLAND. ACAD MIN & MET, FAC PHYS & NUCL TECHNIQUES, KRAKOW, POLAND. JAGIELLONIAN UNIV, DEPT PHYS, PL-31007 KRAKOW, POLAND. DESY, W-2000 HAMBURG, GERMANY. DESY, INST HOCHENERGIEPHYS, ZEUTHEN, GERMANY. IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50121 FLORENCE, ITALY. IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY. UNIV FREIBURG, FAK PHYS, W-7800 FREIBURG, GERMANY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW, LANARK, SCOTLAND. UNIV HAMBURG, INST EXPTL PHYS 1, W-2000 HAMBURG, GERMANY. UNIV HAMBURG, INST EXPTL PHYS 2, W-2000 HAMBURG, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, HIGH ENERGY NUCL PHYS GRP, LONDON, ENGLAND. UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA. FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, JULICH, GERMANY. KOREA UNIV, SEOUL 136701, SOUTH KOREA. LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA. UNIV AUTONOMA MADRID, DEPT FIS TEOR, E-28049 MADRID, SPAIN. UNIV MANITOBA, DEPT PHYS, WINNIPEG, MB R3T 2N2, CANADA. MCGILL UNIV, DEPT PHYS, MONTREAL, PQ, CANADA. MOSCOW PHYS ENGN INST, MOSCOW, RUSSIA. MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW, RUSSIA. NIKHEF, AMSTERDAM, NETHERLANDS. UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS. OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND. UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY. IST NAZL FIS NUCL, PADUA, ITALY. PENN STATE UNIV, DEPT PHYS, UNIVERSITY PK, PA 16802 USA. UNIV ROMA LA SAPIENZA, DIPARTIMENTO FIS, I-00185 ROME, ITALY. IST NAZL FIS NUCL, 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, GERMANY. TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. UNIV TOKYO, INST NUCL STUDY, TOKYO, JAPAN. TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO, JAPAN. IST NAZL FIS NUCL, I-10125 TURIN, ITALY. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10124 TURIN, ITALY. UNIV TURIN, FAC SCI 2, ALESSANDRIA, ITALY. IST NAZL FIS NUCL, ALESSANDRIA, ITALY. UNIV TORONTO, DEPT PHYS, TORONTO, ON M5S 1A1, CANADA. UCL, DEPT PHYS & ASTRON, LONDON, ENGLAND. VIRGINIA POLYTECH INST & STATE UNIV, DEPT PHYS, BLACKSBURG, VA 24061 USA. UNIV WARSAW, INST EXPTL PHYS, PL-00325 WARSAW, POLAND. INST NUCL STUDIES, PL-00681 WARSAW, POLAND. WEIZMANN INST SCI, DEPT NUCL PHYS, IL-76100 REHOVOT, ISRAEL. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. MEIJI GAKUIN UNIV, FAC GEN EDUC, YOKOHAMA, KANAGAWA, JAPAN. YORK UNIV, DEPT PHYS, N YORK, ON M3J 1P3, CANADA. CNR, IROE, I-50127 FLORENCE, ITALY. IST NAZL FIS NUCL, COSENZA, ITALY. UNIV CALABRIA, DEPT PHYS, I-87036 COSENZA, ITALY. RP ARGONNE NATL LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Solomin, Anatoly/C-3072-2016; Bashkirov, Vladimir/A-4818-2008; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Tassi, Enrico/K-3958-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Hernandez Calama, Jose Maria/H-9127-2015; Graciani Diaz, Ricardo/I-5152-2016; Capua, Marcella/A-8549-2015 OI De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Hernandez Calama, Jose Maria/0000-0001-6436-7547; Graciani Diaz, Ricardo/0000-0001-7166-5198; Anzivino, Giuseppina/0000-0002-5967-0952; Castellini, Guido/0000-0002-0177-0643; Capua, Marcella/0000-0002-2443-6525 NR 51 TC 37 Z9 37 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 23 PY 1995 VL 363 IS 3 BP 201 EP 216 DI 10.1016/0370-2693(95)01284-W PG 16 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TG545 UT WOS:A1995TG54500011 ER PT J AU FRANK, P KUSTIN, K ROBINSON, WE LINEBAUGH, L HODGSON, KO AF FRANK, P KUSTIN, K ROBINSON, WE LINEBAUGH, L HODGSON, KO TI NATURE AND LIGATION OF VANADIUM WITHIN WHOLE-BLOOD CELLS AND HENZE SOLUTION FROM THE TUNICATE ASCIDIA CERATODES, AS INVESTIGATED BY USING X-RAY-ABSORPTION SPECTROSCOPY SO INORGANIC CHEMISTRY LA English DT Article ID DENSITY-GRADIENT CENTRIFUGATION; K-EDGE; SEA SQUIRTS; VANADOCYTES; TUNICHROME; CHEMISTRY; SULFUR; COMPLEXES; ACIDITY; MODELS AB Vanadium K-edge X-ray absorption spectroscopy (XAS) studies have been carried out at 10 K on packed whole blood cell samples and on Henze solution from the tunicate Ascidia ceratodes (A. ceratodes). High energy-resolution vanadium K-edge spectra exhibit pre-edge transitions at 5464.9 +/- 0.1, 5466.8 +/- 0.1, and 5468.8 +/- 0.1 eV for both whole blood cell samples and Henze solution. The whole blood vanadium K-edge spectrum is very similar to that of vanadium(III) in aqueous sulfuric acid solution. Both spectra exhibit a feature at 5476 eV indicative of an endogenous vanadium(III)-sulfate interaction. This represents the first direct spectroscopic evidence for intracellular [(VSO4)(H2O)(4-5)](+). Absence of the vanadium(III)-sulfate feature in the vanadium X-ray absorption edge spectrum of Henze solution indicates loss of the sulfate ligand on dilution of the intravacuolar contents following whole cell lysis. Vanadium K-edge EXAFS analysis of the whole blood samples revealed about six nearest neighbor oxygen (or nitrogen) atoms at 1.99 +/- 0.02 Angstrom. No evidence either for the more distant carbon shells of an intracellular vanadium chelate or for (VOV)(4+) dimers, was found in the EXAFS spectra of whole blood cells. Since the XAS spectra were taken at 10 K, the likelihood that significant amounts of such species remained undetected is remote. Taken together, the results are consistent with the proposition that blood cell vanadium, at least within the tunicate A. ceratodes, is >90% monomeric, existing as a mixture of the hexaaquovanadium(III) ion and the [(VSO4)(H2O)(4-5)](+) complex ion. The possible presence of up to 10% of, e.g., a tris-chelated tunichrome-vanadium(III) complex is not excluded. Within Henze solution, vanadium K-edge and EXAFS spectral analysis likewise indicated unoxidized, monomeric V(III) with six to seven first shell oxygens at 1.99 +/- 0.02 Angstrom but with no indication of a sulfate interaction. C1 STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. BRANDEIS UNIV,DEPT CHEM,WALTHAM,MA 02254. UNIV MASSACHUSETTS,ENVIRONM SCI PROGRAM,BOSTON,MA 02125. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. NR 70 TC 39 Z9 39 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 22 PY 1995 VL 34 IS 24 BP 5942 EP 5949 DI 10.1021/ic00128a004 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF982 UT WOS:A1995TF98200004 ER PT J AU WANG, WD BAKAC, A ESPENSON, JH AF WANG, WD BAKAC, A ESPENSON, JH TI URANIUM(VI)-CATALYZED PHOTOOXIDATION OF HYDROCARBONS WITH MOLECULAR-OXYGEN SO INORGANIC CHEMISTRY LA English DT Article ID ELECTRON-TRANSFER REACTIONS; TRANSITION-METAL COMPLEXES; AQUEOUS-SOLUTION; RATE CONSTANTS; SPIN RESONANCE; URANYL-ION; HYDROGEN ABSTRACTION; PULSE-RADIOLYSIS; EXCITED-STATES; RADICALS AB Uranium (VI) catalyzes the photooxidation of alkanes, alkenes, alcohols, and aldehydes by molecular oxygen in aqueous solution. Despite the mechanistic complexities, each of the reactions investigated yielded a single organic product. On the basis of the quenching kinetics, the deuterium isotope effects, the nature of the products, and linear free energy relationships, all the reactions appear to take place by hydrogen atom abstraction from C-H bonds, followed by uranium-mediated product formation. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 59 TC 63 Z9 63 U1 4 U2 18 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 22 PY 1995 VL 34 IS 24 BP 6034 EP 6039 DI 10.1021/ic00128a014 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF982 UT WOS:A1995TF98200014 ER PT J AU XIE, XB MCCARLEY, RE AF XIE, XB MCCARLEY, RE TI SYNTHESIS, STRUCTURE, AND CHARACTERIZATION OF N-LIGATED TUNGSTEN SELENIDE CLUSTER COMPLEXES W(6)SE(8)L(6) SO INORGANIC CHEMISTRY LA English DT Article ID CHEVREL PHASES; HYDRODESULFURIZATION AB Two new W6Se8 cluster units are reported via the reaction of W6Cl12 with Na2Se in the refluxing amine solvents pyridine (py) and piperidine (pip). Crystals for both complexes were grown from the reaction filtrates. Crystallographic data for these complexes are as follows: W6Se8(pip)(6) . 8pip (1), cubic, <1(4)over bar 3d>, a = 31.150(4) Angstrom, Z = 12; W6Se8(py)(6) . 6py (2), trigonal, , a = 19.654(2) Angstrom, c = 15.100(5) Angstrom, Z = 3. W-W and W-Se bond distances show little variation among the complexes with average values of 2.691(1) and 2.574(1) Angstrom, respectively. Photoelectron spectra give characteristic tungsten binding energies at 30.8 eV (W 4f(7/2)) and 32.9 eV (W 4f(5/2)). IR spectra show strong bands at 243-254 cm(-1), attributable to the T-Iu W-Se stretching modes. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 19 TC 27 Z9 27 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 22 PY 1995 VL 34 IS 24 BP 6124 EP 6129 DI 10.1021/ic00128a025 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF982 UT WOS:A1995TF98200025 ER PT J AU SCHIMEK, GL CHEN, SC MCCARLEY, RE AF SCHIMEK, GL CHEN, SC MCCARLEY, RE TI SYNTHESIS AND CHARACTERIZATION OF K3MO14O22, K1.66PB1.34MO14O22, AND K1.29SN1.71MO14O22 - OLIGOMERIC CLUSTERS WITH 3 TRANS EDGE-SHARED MO OCTAHEDRA SO INORGANIC CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE; REDUCED TERNARY; MOLYBDENUM; COMPOUND; NAMO4O6; PBMO5O8; OXIDES; CHAINS; UNITS; IONS AB The preparation and structural characterization of three new M(3)Mo(14)O(22) members in the series M(n)Mo(4n+2)P(6n+4) with n = 3 have afforded an experimental picture of the relationship between structure and bonding and the number of electrons available for metal-metal bonding. The three compounds, K3Mo14O22, K1.66Pb1.34Mo14O22, and K1.29Sn1.71Mo14O22, were synthesized from the appropriate quantities of metals, metal oxides, and potassium molybdate fired at 1200-1500 degrees C for 4-9 days. They were all structured in the space group P2(1)/a (No. 14) with Z = 2 and a = 9.916(2), 9.917(1), and 9.929(2) Angstrom; b = 9.325(2), 9.276(1), and 9.294(1) Angstrom; c = 10.439(2), 10.3560(9), and 10.338(2) Angstrom; beta = 103.96(1)degrees, 103.827(7)degrees. and 104.13(2)degrees; and R/R(w) (%) = 3.14/3.69, 6.00/4.81, and 2.45/2.99; using observed reflections/parameters of 1060/176, 1830/135, and 1015/182, respectively. The materials have condensed clusters with strong metal-metal bonding that are constructed of three trans edge-shared molybdenum octahedra with all edges bridged by oxygen atoms. The important differences among the clusters in these compounds are in the arrangement of the intercluster and apical-apical molybdenum bonding. The trimeric cluster units are interconnected via Mo-O bonding in a stair-step fashion along the c direction. In the a-b plane, Mo-O intercluster bonding creates a pocket in which the cations reside. The changes in bonding are correlated to the increasing number of electrons available for metal-metal bonding, based upon Mo-Mo bond order and Mo-O bond valence sums. Magnetic susceptibility and electrical resistivity results are discussed with respect to the structure and bonding. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 36 TC 19 Z9 19 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 22 PY 1995 VL 34 IS 24 BP 6130 EP 6140 DI 10.1021/ic00128a026 PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF982 UT WOS:A1995TF98200026 ER PT J AU GEETHA, S YE, MC VERKADE, JG AF GEETHA, S YE, MC VERKADE, JG TI SYNTHESIS AND STRUCTURAL FEATURES OF N-MONO(TRIMETHYLSTANNYL)ACETAMIDE AND N,N-BIS(TRIMETHYLSTANNYL)ACETAMIDE DERIVATIVES SO INORGANIC CHEMISTRY LA English DT Article AB The synthesis of CF3C(O)NH(SnMe(3)) (1), CH3C(O)NR(SnMe(3)) (2, R = H; 3, R = Me; 4, R = Ph) and CH3C(O)N(SnMe(3))(2) (5) are reported. The IR and NMR (H-1, C-13, Sn-119) spectra are consistent with strong dominance of the planar amidate (rather than an imidate) tautomer. The Sn-119 NMR spectra of 1-5 are temperature invariant. The structures of 3 and 5, determined by X-ray means, revealed the presence of an intramolecular Sn- - -O interaction in which the SnMe(3) group is cis to the carbonyl, and an intermolecular O- - -Sn interaction which is stronger. Comparison of the solution and solid state Sn-119 NMR chemical shifts of 3 and 5 indicates that both types of Sn- - -O interactions are more robust in the solid state, Crystallographic data for 3: space group P2(1)/n, a = 9.866 (3) Angstrom, b = 9.574 (4) Angstrom, c = 9.881 (3) Angstrom, alpha = 90 degrees, beta = 98.90 (1)degrees, gamma = 90.0 degrees, V = 922.1 (6) Angstrom(3); R = 0.0284. Crystallographic data for 5: space group P2(1)/n, a = 6.898(1) Angstrom, b = 16.884(1) Angstrom, c = 11.222(3) Angstrom, alpha = 90.0 degrees, beta = 94.54(1)degrees, gamma = 90.0 degrees, V = 1302.9(4) Angstrom(3), R = 0.025. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,GILMAN HALL,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 24 TC 5 Z9 5 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 22 PY 1995 VL 34 IS 24 BP 6158 EP 6162 DI 10.1021/ic00128a029 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF982 UT WOS:A1995TF98200029 ER PT J AU BATES, WD CHEN, PY BIGNOZZI, CA SCHOONOVER, JR MEYER, TJ AF BATES, WD CHEN, PY BIGNOZZI, CA SCHOONOVER, JR MEYER, TJ TI RESONANCE RAMAN-SPECTROSCOPY OF RUTHENIUM(II) AND OSMIUM(II) POLYPYRIDYL COMPLEXES CONTAINING THE N-METHYL-4,4'-BIPYRIDINIUM RADICAL (MQ(CENTER-DOT)) AS A LIGAND - EVIDENCE FOR A M(D-PI)-]MQ(CENTER-DOT)(PI-ASTERISK) METAL-TO-LIGAND CHARGE-TRANSFER (MLCT) TRANSITION SO INORGANIC CHEMISTRY LA English DT Note ID ELECTRON-TRANSFER; SEPARATION; ACCEPTOR; STATE; DONOR AB Free N-methyl-4,4'-bipyridinium radical (MQ(.)) displays broad, visible absorptions at 360 and 600 nm that can be assigned to pi --> pi* and pi* --> pi* (MQ(.)) transitions. Excitation-dependent resonance Raman measurements on MQ(.), [(bpy)(2)Ru(MQ(.))(2)](2+), and [(bpy)(2)Os(CO)(MQ(.))](2+) indicate that new absorption bands in the complexes are MQ(.)-based and causes significant resonance enhancements for modes affected by a change in the oxidation state at the metal. The new band is assigned to a MII --> (d pi) -->MQ(.)(pi*) metal-to-ligand charge transfer (MLCT) transition. C1 LOS ALAMOS NATL LAB,BIOSCI & BIOTECHNOL GRP,LOS ALAMOS,NM 87544. UNIV FERRARA,CNR,CTR FOTOREATT & CATALISI,DIPARTIMENTO CHIM,I-44100 FERRARA,ITALY. UNIV N CAROLINA,DEPT CHEM,CHAPEL HILL,NC 27599. NR 21 TC 11 Z9 11 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 22 PY 1995 VL 34 IS 24 BP 6215 EP & DI 10.1021/ic00128a039 PG 0 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF982 UT WOS:A1995TF98200039 ER PT J AU STEED, JW JOHNSON, CP BARNES, CL JUNEJA, RK ATWOOD, JL REILLY, S HOLLIS, RL SMITH, PH CLARK, DL AF STEED, JW JOHNSON, CP BARNES, CL JUNEJA, RK ATWOOD, JL REILLY, S HOLLIS, RL SMITH, PH CLARK, DL TI SUPRAMOLECULAR CHEMISTRY OF P-SULFONATOCALIX[5] ARENE - A WATER-SOLUBLE, BOWL-SHAPED HOST WITH A LARGE MOLECULAR CAVITY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CALIXARENE-BASED URANOPHILES; ION COMPLEXES; CALIX<4>ARENES; INCLUSION; P-TERT-BUTYLCALIX<5>ARENE; EXTRACTION; STABILITY; CATION; ACID AB The first X-ray crystallographic studies are reported for water-soluble inclusion complexes of the macrocyclic p-sulfonatocalix[5]arene(1) (1b). The complexes Na-7[p-sulfonatocalix[5]arene]. 18H(2)O (2) and Na-5[p-sulfonatocalix[5]arene]. py-N-O . 8.5H(2)O (3) containing water and pyridine N-oxide (py-N-O) guest species have been isolated. In 2 the large bowl-shaped cavity of the host molecule is occupied by a total of three water molecules, while for 3 a single molecule of pyridine N-oxide is included and interacts with the host via a strong hydrogen bond to a protonated sulfonate substituent. The behavior of 1b as a ligand for a number of lanthanide elements is also reported. Low temperature X-ray structural studies reveal that coordination of the Ln(3+) metal ions to the calixarene ligand occurs exclusively via the sulfonato functionalities and not the phenolic oxygen atoms as suggested by Shinkai et al. for the complexation of UO22+ by 1b. In complex 2 the calixarene exists as the heptaanion. In contrast, crystallization from acidic solution results in complexes 3-8 retaining all their phenolic protons. The protonation constants of 1b have been measured in aqueous solution: pK(a) = 10.96(8), 7.63(5), and 4.31(1) at 25 degrees C and 0.1 M KNO3. C1 UNIV MISSOURI,DEPT CHEM,COLUMBIA,MO 65211. LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. RP STEED, JW (reprint author), UNIV LONDON KINGS COLL,DEPT CHEM,STRAND,LONDON WC2R 2LS,ENGLAND. RI Steed, Jonathan/A-7916-2008; Clark, David/A-9729-2011 OI Steed, Jonathan/0000-0002-7466-7794; NR 42 TC 134 Z9 134 U1 3 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 22 PY 1995 VL 117 IS 46 BP 11426 EP 11433 DI 10.1021/ja00151a006 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA TG446 UT WOS:A1995TG44600006 ER PT J AU HERRON, WJ GOERINGER, DE MCLUCKEY, SA AF HERRON, WJ GOERINGER, DE MCLUCKEY, SA TI GAS-PHASE ELECTRON-TRANSFER REACTIONS FROM MULTIPLY-CHARGED ANIONS TO RARE-GAS CATIONS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID TANDEM MASS-SPECTROMETRY; ION MOLECULE REACTIONS; COLLISION-INDUCED DISSOCIATION; ASSISTED LASER DESORPTION; PROTON-TRANSFER; LARGE BIOMOLECULES; CYTOCHROME-C; ACTIVATED DISSOCIATION; IONIZATION; PROTEINS AB Multiply-charged anions derived from electrospray have been subjected to reactions with singly-charged cations of argon, krypton, and xenon in a quadrupole ion trap. The doubly-charged anion formed from a sulfonated azo dye and the highest negative charge states formed from the polyadenylates 5'-d(AAA)-3', 5'-d(AAAA)-3', and 5'-d(AAAAA)-3' sen ed as the anionic reactants. In each case, extensive fragmentation of the anionic product, which presumably is a radical anion, was observed. Comparison of the observed decomposition products arising from ion/ion reactions with product anions formed via collisional activation of the even-electron species of the same charge state, as formed directly by electrospray, shows significant differences. While both the even-electron and odd-electron species hold some fragmentation pathways in common, the odd-electron species show one or more additional decomposition channels. Furthermore, in the case of the polyadenylate anions, the ion/ion reactions showed more nearly equal contributions from the major dissociation channels that yield sequence information than did collisional activation of the corresponding even-electron anions. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 75 TC 64 Z9 65 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 22 PY 1995 VL 117 IS 46 BP 11555 EP 11562 DI 10.1021/ja00151a021 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA TG446 UT WOS:A1995TG44600021 ER PT J AU BECK, LW XU, T NICHOLAS, JB HAW, JF AF BECK, LW XU, T NICHOLAS, JB HAW, JF TI KINETIC NMR AND DENSITY-FUNCTIONAL STUDY OF BENZENE H/D EXCHANGE IN ZEOLITES, THE MOST SIMPLE AROMATIC-SUBSTITUTION SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID NUCLEAR-MAGNETIC-RESONANCE; CARBONIUM-IONS; REARRANGEMENT; SPECTROSCOPY; MOLECULES; BEHAVIOR; MODELS C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. TEXAS A&M UNIV, DEPT CHEM, MAGNET RESONANCE & MOLEC SCI LAB, COLLEGE STN, TX 77843 USA. NR 33 TC 72 Z9 74 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 22 PY 1995 VL 117 IS 46 BP 11594 EP 11595 DI 10.1021/ja00151a031 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA TG446 UT WOS:A1995TG44600031 ER PT J AU PUEYO, JJ MOLINER, E SEIBERT, M PICOREL, R AF PUEYO, JJ MOLINER, E SEIBERT, M PICOREL, R TI PIGMENT CONTENT OF D1-D2-CYTOCHROME B(559) REACTION-CENTER PREPARATIONS AFTER REMOVAL OF CP47 CONTAMINATION - AN IMMUNOLOGICAL STUDY SO BIOCHEMISTRY LA English DT Article ID II REACTION CENTER; REACTION CENTER COMPLEX; PHOTOSYNTHETIC REACTION-CENTER; NON-IONIC DETERGENT; THYLAKOID MEMBRANES; B559 COMPLEX; PISUM-SATIVUM; POLYPEPTIDES; PROTEIN; SPINACH AB Isolated D1-D2-cytochrome b(559) photosystem II reaction center preparations with pigment stoichiometry higher than 4 chlorophylls per 2 pheophytins can be contaminated with CP47 proximal antenna complex. Reaction centers prepared by a modification of the Nanba-Satoh procedure and containing about 6 chlorophylls per 2 pheophytins showed immuno-cross-reactivity when probed with a monoclonal antibody raised against the CP47 polypeptide. Furthermore, they could be fractionated successfully by Superose-12 sieve chromatography into two different populations. The first few fractions off the column contained a more definitive 435 nm shoulder corresponding to increased chlorophyll content, and showed strong immuno-cross-reactivity with the CP47 antibody. The peak fractions off the column displayed a less prominent 435 nm shoulder, and did not cross-react with the antibody. Moreover, when a 6-chlorophyll preparation was mixed with Sepharose beads coupled to CP47 antibody, the eluted material corresponded to a preparation of-about 4 chlorophylls per 2 pheophytins and did not show any crossreaction with the antibody against CP47. The amount of CP47 protein in the 6-chlorophyll preparation as quantitated using Coomassie Blue staining or from gel blots was sufficient to account for most of the extra 2 chlorophylls. We conclude that D1-D2-cytochrome b(559) preparations containing more than 4 chlorophylls per 2 pheophytins can be contaminated with small amounts of CP47-D1-D2-Cyt b(559) complex and that native photosystem II reaction centers contain 4 core chlorophylls per 2 pheophytins. C1 CSIC,ESTAC EXPTL AULA DEI,DEPT PLANT NUTR,E-50080 ZARAGOZA,SPAIN. NATL RENEWABLE ENERGY LAB,PHOTOCONVERS BRANCH,GOLDEN,CO 80401. RI PICOREL, RAFAEL/K-7930-2014; Pueyo, Jose/D-8993-2016 OI PICOREL, RAFAEL/0000-0003-3791-129X; Pueyo, Jose/0000-0003-0337-4078 NR 38 TC 9 Z9 9 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 21 PY 1995 VL 34 IS 46 BP 15214 EP 15218 DI 10.1021/bi00046a029 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TF763 UT WOS:A1995TF76300029 PM 7578136 ER PT J AU COSMAN, M HINGERTY, BE GEACINTOV, NE BROYDE, S PATEL, DJ AF COSMAN, M HINGERTY, BE GEACINTOV, NE BROYDE, S PATEL, DJ TI STRUCTURAL ALIGNMENTS OF (+)-TRANS-ANTI-BENZO[A]PYRENE-DG AND (-)-TRANS-ANTI-BENZO[A]PYRENE-DG ADDUCTS POSITIONED AT A DNA TEMPLATE-PRIMER JUNCTION SO BIOCHEMISTRY LA English DT Article ID BENZOPYRENE DIOL-EPOXIDES; NUCLEAR MAGNETIC-RESONANCE; ESCHERICHIA-COLI PLASMID; SOLUTION CONFORMATION; NMR-SPECTROSCOPY; MAJOR ADDUCT; DUPLEX; CARCINOGENESIS; BENZO(A)PYRENE; BINDING AB The structural features of a chemically modified DNA template strand may promote error-prone DNA synthesis during replication. The resulting higher incidence of mutations, in turn, can eventually lead to tumor initiation. Structural insights into this process can be monitored by studying chemically modified base adducts of defined stereochemistry positioned site-specifically at a single strand-duplex template-primer junction. We have used a NMR-molecular mechanics approach to obtain the solution conformations of the covalent adducts derived from trans additions at the [BP]C-10 position of the highly tumorigenic (+)-anti-benzo[a]pyrene diol epoxide [(+)-anti-BPDE] and nontumorigenic (-)-anti-benzo[a]pyrene diol epoxide [(-)-anti-BPDE] to the N-2 position of guanine [(+) and (-)-trans-anti-[BP]dG, respectively] in the d(A1-A2-C3-[BP]G4-C5-T6-A7-C8-C9-A10-T11-C12-C13). d(G14-G15-A16-T17-G18-G19-T20-A21-G22) 13/9-mer DNA sequence. The modified 13-mer strand constitutes the template strand, while the complementary 9-mer strand constitutes a primer which has been synthesized from the 3'-end of the template toward the 5'-end up to the base preceding, but not including, the modified guanine. The modified guanine (denoted by [BP]dG4) is positioned at the junction site between the single-stranded and duplex segments. Structural features of the (+)-trans-anti-[BP]dG 13/9-mer have been determined by incorporating proton-proton distances defined by lower and upper bounds deduced from NOESY spectra as restraints in molecular mechanics computations in torsion angle space. The 3'-side duplex segment retains a minimally perturbed B-DNA conformation with all nine base pairs in Watson-Crick hydrogen-bended alignments. Conformational heterogeneity is detected at the single-stranded d(A1-A2-C3) segment located 5' to the modified (+)-trans-anti-[BP]dG lesion which contrasts with an unperturbed alignment of these same residues in the unmodified control 13/9-mer. The modified guanine adopts a syn glycosidic torsion angle, is displaced into the major groove, and no longer stacks over the adjacent dC5 . dG22 base pair. Such a base displacement is accompanied by stacking of one face of the pyrenyl ring with the dC5 . dG22 base pair located on the duplex segment proximate to the modified guanine, while the other face of BP is exposed to solvent. The orientations elucidated for the modified guanine and benzo[a]pyrenyl rings in the (+)-trans-anti-[BP]dG template-primer junction contrasts with orientations previously reported for the same adduct when positioned opposite either a dC base [Cosman, M., et al. (1992) Proc. Natl. Acad. Sci. U.S.A. 89, 1914-1918] or a deletion site [Cosman, M., et al, (1994) Biochemistry 33, 11507-11517] at the duplex level. The NMR spectra of the stereoisomeric (-)-trans-anti-[BP]dG 13/9-mer are characterized by very broad and overlapped resonances for the protons located at the lesion site and for the single-strand and duplex segments flanking this site as well as by the presence of-exchange cross peaks. This result indicates conformational heterogeneity for the strand and duplex segments on either side of the lesion site in the (-)-trans-anti-[BP]dG 13/9-mer precluding characterization of the structural alignment of this lesion when positioned at the template-primer junction. The different spectral and structural patterns associated with the stereoisomeric (+)- and (-)-trans-anti-[BP]dG 13/9-mers should help to define the interrelationship between the conformations of site-specific and stereochemically defined covalent DNA adducts at template-primer junction sites and their effects on the action of polymerases in the cell. C1 NYU,DEPT CHEM,NEW YORK,NY 10003. NYU,DEPT BIOL,NEW YORK,NY 10003. MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831. FU NCI NIH HHS [CA-28038, CA-20851, CA-46533] NR 58 TC 60 Z9 60 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 21 PY 1995 VL 34 IS 46 BP 15334 EP 15350 DI 10.1021/bi00046a043 PG 17 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TF763 UT WOS:A1995TF76300043 PM 7578150 ER PT J AU SHOJAIE, SS RIALS, TG KELLEY, SS AF SHOJAIE, SS RIALS, TG KELLEY, SS TI PREPARATION AND CHARACTERIZATION OF CELLULOSE-ACETATE ORGANIC-INORGANIC HYBRID FILMS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID STRUCTURE PROPERTY BEHAVIOR; SOL-GEL PROCESS; TETRAETHOXYSILANE; GLASSES AB A series of organic/inorganic hybrid (OIH) films were prepared using cellulose acetate (CA) as the organic component and tetraethyl orthosilicate (TEOS) as the inorganic component. The chemical, morphological, and mechanical properties of these films were evaluated with a variety of analytical techniques. The results of these evaluations showed that crosslinked CA OIH films were formed during the sol-gel reactions. The structure of OIH films was very sensitive to the CA/TEOS ratio and film formation conditions. All of the films with added TEOS were two phase on a molecular level i.e., inorganic TEOS domains surrounded by a CA matrix. Under some film formation conditions the presence of TEOS, a nonsolvent for CA, led to solvent/nonsolvent phase separation on the micron scale. (C) 1995 John Wiley & Sons, Inc. C1 SO FOREST EXPT STN,PINEVILLE,LA 71360. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. NR 12 TC 25 Z9 27 U1 0 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD NOV 21 PY 1995 VL 58 IS 8 BP 1263 EP 1274 DI 10.1002/app.1995.070580807 PG 12 WC Polymer Science SC Polymer Science GA TB897 UT WOS:A1995TB89700007 ER PT J AU LEE, YF KIRCHHOFF, JR BERGER, RM GOSZTOLA, D AF LEE, YF KIRCHHOFF, JR BERGER, RM GOSZTOLA, D TI SPECTROELECTROCHEMISTRY AND EXCITED-STATE ABSORPTION-SPECTROSCOPY OF RHENIUM(I) ALPHA,ALPHA'-DIIMINE COMPLEXES SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID POLYAZINE BRIDGING LIGANDS; RUTHENIUM(II) BIMETALLIC COMPLEXES; VISIBLE-LIGHT IRRADIATION; MIXED-VALENCE COMPLEXES; ELECTROCHEMICAL PROPERTIES; CARBON-DIOXIDE; ELECTROCATALYTIC REDUCTION; LUMINESCENCE PROPERTIES; POLYPYRIDINE COMPLEXES; PHOTOINDUCED REDUCTION AB Thin-layer electrochemistry and spectroelectrochemistry in 0.1 mol dm(-3) NBu(4)PF(6)-dmf (dmf = dimethylformamide) have been used to characterize spectroscopically the sequentially reduced forms of [Re(bipy)(CO)(3)Cl], [Re(dpp)(CO)(3)Cl] and [{Re(CO)(3)Cl}(2)(dpp)] [dpp = 2,3-bis(2-pyridyl) pyrazine, bipy = 2,2'-bipyridine]. Following the first reduction of each complex, the spectra exhibit similar absorption features in the near-UV region from 350 to 400 nm with a tailing absorption to ca. 500-600 nm. The excited-state absorption spectra of [Re(dpp)(CO)(3)Cl] and [{Re(CO)(3)Cl}(2)(dpp)] have also been obtained and exhibit similar features as in the spectroelectrochemical measurements. The spectra are consistent with reduction of the alpha,alpha'-diimine ligand and are dominated by pi --> pi* transitions of the ligand radical anion. Addition of a second electron to the monometallic complexes yields spectra that are characterized by a broad absorption band in the range 530-580 nm (epsilon = 10 900-12 100 dm(3) mol(-1) cm(-1)). In comparison, addition of a second electron to [{Re(CO)(3)Cl}(2)(dpp)] also yields a broad absorption at 550 nm (epsilon = 8800 dm(3) mol(-1) cm(-1)) and loss of the absorption at 357 nm, which is analogous to the spectrum for the doubly reduced [Re(dpp)(CO)(3)Cl] complex. Further reduction of the bimetallic complex results in identical spectral features as the doubly reduced complex with the main difference being an increase in absorbance over the entire UV/VIS region and a red shift of the lowest energy absorption to 576 nm. The spectroelectrochemical measurements for [{Re(CO)(3)Cl}(2)(dpp)] suggest the second and third reductions result in reduction of the metal centres contrary to previous reports for electron localization in the bimetallic complex, which describe the second reduction as ligand based. C1 INDIANA UNIV PURDUE UNIV, DEPT CHEM, FT WAYNE, IN 46805 USA. ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RP LEE, YF (reprint author), UNIV TOLEDO, DEPT CHEM, TOLEDO, OH 43606 USA. RI Gosztola, David/D-9320-2011 OI Gosztola, David/0000-0003-2674-1379 NR 75 TC 20 Z9 20 U1 1 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1472-7773 J9 J CHEM SOC DALTON JI J. Chem. Soc.-Dalton Trans. PD NOV 21 PY 1995 IS 22 BP 3677 EP 3682 DI 10.1039/dt9950003677 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TF772 UT WOS:A1995TF77200016 ER PT J AU MEHR, R FRIDKISHARELI, M ABEL, L SEGEL, L GLOBERSON, A AF MEHR, R FRIDKISHARELI, M ABEL, L SEGEL, L GLOBERSON, A TI LYMPHOCYTE DEVELOPMENT IN IRRADIATED THYMUSES - DYNAMICS OF COLONIZATION BY PROGENITOR CELLS AND REGENERATION OF RESIDENT CELLS SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID BONE-MARROW CELLS; STEM-CELLS; OLD MICE; FETAL THYMUS; T-CELLS; YOUNG; MOUSE; TRANSPLANTATION; DIFFERENTIATION; PRECURSORS AB Lymphocyte development in irradiated thymuses was analyzed using two complementary strategies: an in vitro experimental model and computer simulations. In the in vitro model, fetal thymus lobes were irradiated and the regeneration of cells that survived irradiation were examined, with the results compared to those of reconstitution of the thymus by donor bone marrow cells and their competition with the thymic resident cells. In vitro measurements of resident cell kinetics showed that cell proliferation is slowed down significantly after a relatively low (10 Gy) irradiation dose. Although the number of thymocytes that survived irradiation remained low for several days post-irradiation, further colonization by donor cells was not possible, unless performed within 6 h after irradiation. These experimental results, coupled with the analysis by computer simulations, suggest that bone marrow cell engraftment in the irradiated thymus may be limited by the presence of radiation-surviving thymic resident cells and the reduced availability of seeding niches. (C) 1995 Academic Press Limited C1 WEIZMANN INST SCI,DEPT CELL BIOL,REHOVOT,ISRAEL. WEIZMANN INST SCI,DEPT APPL MATH & COMP SCI,REHOVOT,ISRAEL. RP MEHR, R (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MAIL STOP K710,DROP POINT 3-483-01U,LOS ALAMOS,NM 87545, USA. OI Mehr, Ramit/0000-0002-4303-6834 NR 27 TC 12 Z9 13 U1 0 U2 0 PU ACADEMIC PRESS (LONDON) LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD NOV 21 PY 1995 VL 177 IS 2 BP 181 EP 192 DI 10.1006/jtbi.1995.0237 PG 12 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA TJ635 UT WOS:A1995TJ63500009 PM 8558905 ER PT J AU PALMER, RB FERNOW, RC FISCHER, J GALLARDO, JC KIRK, HG ULC, S WANG, H ZHAO, Y EPPLEY, K HERRMANNSFELDT, W MILLER, R YU, D AF PALMER, RB FERNOW, RC FISCHER, J GALLARDO, JC KIRK, HG ULC, S WANG, H ZHAO, Y EPPLEY, K HERRMANNSFELDT, W MILLER, R YU, D TI THE CLUSTER KLYSTRON DEMONSTRATION EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The cluster klystron is a new concept for providing a power source for future linear colliders. This type of klystron uses many parallel beams from magnetron injection gun sources inside a common solenoidal magnetic field. Since each individual beam has a low current, it should be possible to obtain high efficiency and after recombination of the beams, high output power. This paper describes the concept and preparations for a proof of principle experiment now underway at Brookhaven National Laboratory (BNL). C1 BROOKHAVEN NATL LAB, CTR ACCELERATOR PHYS, UPTON, NY 11973 USA. STANFORD UNIV, CTR LINEAR ACCELERATOR, STANFORD, CA 94305 USA. DULY RES INC, RANCHO PALOS VERDES, CA 90732 USA. NR 29 TC 3 Z9 3 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 NOV 21 PY 1995 VL 366 IS 1 BP 1 EP 16 DI 10.1016/0168-9002(95)00609-5 PG 16 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TG309 UT WOS:A1995TG30900001 ER PT J AU BISCARDI, R KRAMER, SL RAMIREZ, G AF BISCARDI, R KRAMER, SL RAMIREZ, G TI BUNCH LENGTH CONTROL IN THE NSLS VUV RING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The lifetime in the NSLS VUV ring is limited by intra-bunch scattering (Touschek scattering). A second RF cavity was added to lengthen the electron bunch, thereby reducing the Touschek loss rate. Initially, the cavity was operated in a ''passive'' mode. This provided significant lifetime enhancement at higher currents, but also created larger than normal bunch length variations over the range of operating currents. In October 1993, a generator was added to the system to provide greater bunch length control and added lifetime at all operating currents. Recent studies have also been done on bunch shortening with encouraging results. This paper provides a summary of the system, including results from studies and operations. RP BISCARDI, R (reprint author), BROOKHAVEN NATL LAB,BLDG 725-B,UPTON,NY 11973, 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 21 PY 1995 VL 366 IS 1 BP 26 EP 30 DI 10.1016/0168-9002(95)00522-6 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TG309 UT WOS:A1995TG30900004 ER PT J AU WALLSTROM, TC AF WALLSTROM, TC TI TURBULENT-DIFFUSION PHASE-TRANSITION IS DUE TO SINGULAR ENERGY-SPECTRUM SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE TURBULENT TRANSPORT; TURBULENCE; INTERMITTENCY; SCALING ID EXACT RENORMALIZATION; MATHEMATICAL-MODELS; TRANSPORT; FLUID AB The phase transition for turbulent diffusion, reported by Avellaneda and Majda [Avellaneda, M. & Majda, A. J. (1994) Philos. Trans. R. Sec. London A 346, 205-233, and several earlier papers], is traced to a modeling assumption in which the energy spectrum of the turbulent fluid is singularly dependent on the viscosity in the inertial range. Phenomenological models of turbulence and intermittency, by contrast, require that the energy spectrum be independent of the viscosity in the inertial range. When the energy spectrum is assumed to be consistent with the phenomenological models, there is no phase transition for turbulent diffusion. RP WALLSTROM, TC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 23 TC 6 Z9 6 U1 1 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD NOV 21 PY 1995 VL 92 IS 24 BP 11005 EP 11008 DI 10.1073/pnas.92.24.11005 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TF891 UT WOS:A1995TF89100038 PM 11607590 ER PT J AU WAGNER, RP AF WAGNER, RP TI HSU,T.C - AN ILLUMINATION SO AMERICAN JOURNAL OF MEDICAL GENETICS LA English DT Item About an Individual C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP WAGNER, RP (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0148-7299 J9 AM J MED GENET JI Am. J. Med. Genet. PD NOV 20 PY 1995 VL 59 IS 3 BP 326 EP 328 DI 10.1002/ajmg.1320590309 PG 3 WC Genetics & Heredity SC Genetics & Heredity GA TE948 UT WOS:A1995TE94800008 PM 8599355 ER PT J AU PENETRANTE, BM HSIAO, MC MERRITT, BT VOGTLIN, GE WALLMAN, PH KUTHI, A BURKHART, CP BAYLESS, JR AF PENETRANTE, BM HSIAO, MC MERRITT, BT VOGTLIN, GE WALLMAN, PH KUTHI, A BURKHART, CP BAYLESS, JR TI ELECTRON-IMPACT DISSOCIATION OF MOLECULAR NITROGEN IN ATMOSPHERIC-PRESSURE NONTHERMAL PLASMA REACTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID FLUE-GAS; NOX; IRRADIATION; EXHAUST; CORONA; SO2 AB This letter presents measurements of the specific energy consumption (eV per molecule) for electron-impact dissociation of N-2 (e+N-2-->e+N+N) in a pulsed corona and an electron beam reactor. Measurements were done using 100 pm of NO in N-2. In this mixture the removal of NO is dominated by the reduction reaction N+NO-->N-2+O. By measuring the specific energy consumption for reduction of NO, these experiments provide a good measure of the specific energy consumption for electron-impact dissociation of N-2. The specific energy consumption using pulsed corona processing is 480 eV per dissociated N-2 molecule. For electron beam processing, the specific energy consumption is 80 eV per dissociated N-2 molecule. (C) 1995 American Institute of Physics. C1 FIRST POINT SCI INC,AGOURA HILLS,CA 91301. RP PENETRANTE, BM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 26 TC 32 Z9 35 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 NOV 20 PY 1995 VL 67 IS 21 BP 3096 EP 3098 DI 10.1063/1.114876 PG 3 WC Physics, Applied SC Physics GA TF574 UT WOS:A1995TF57400015 ER PT J AU ZHANG, SB FROYEN, S ZUNGER, A AF ZHANG, SB FROYEN, S ZUNGER, A TI SURFACE DIMERIZATION INDUCED CUPTB VERSUS CUPTA ORDERING OF GAINP ALLOYS SO APPLIED PHYSICS LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; RECONSTRUCTIONS AB Using a valence force field approach and ab initio pseudopotential calculations, we examine the role of subsurface strain in the ordering of Ga0.5In0.5P alloys. We show that depending on the orientation of the surface phosphorus dimers, these alloys can have (i) a CuPtA ordering for 1X2 or c(4X4) reconstruction; (ii) a CuPtB ordering for 2X1 or beta 2(2X4) reconstruction; and (iii) a triple period ordering for 2X3 or c(8X6) reconstruction. These results are in good agreement with recent experiments of Gomyo et al. [Phys. Rev. Lett. 72, 673 (1994); Jpn. J. Appl. Phys. 34, L469 (1995)]. (C) 1995 American Institute of Physics. RP ZHANG, SB (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013; Krausnick, Jennifer/D-6291-2013; Zhang, Shengbai/D-4885-2013 OI Zhang, Shengbai/0000-0003-0833-5860 NR 15 TC 104 Z9 104 U1 1 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 20 PY 1995 VL 67 IS 21 BP 3141 EP 3143 DI 10.1063/1.114860 PG 3 WC Physics, Applied SC Physics GA TF574 UT WOS:A1995TF57400030 ER PT J AU CAMPBELL, IH JOSWICK, MD PARKER, ID AF CAMPBELL, IH JOSWICK, MD PARKER, ID TI DIRECT MEASUREMENT OF THE INTERNAL ELECTRIC-FIELD DISTRIBUTION IN A MULTILAYER ORGANIC LIGHT-EMITTING DIODE SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTROLUMINESCENT DEVICES; 3-LAYER STRUCTURE; CONFINEMENT; FILMS AB We present a general electroabsorption technique to measure the electric field in each layer of multilayer organic light-emitting diodes. The electroabsorption signal from each layer is identified spectroscopically and measured as a function of de bias. Measurements were made on three layer devices consisting of a hole transport layer, a light-emitting layer, and an electron transport layer. In reverse bias, without significant charge injection, the de electric field is uniform throughout the device. In forward bias, the de electric field is distributed nonuniformly; it is smallest in the light-emitting layer and largest in the hole transport layer. The nonuniform de electric field distribution is caused by the accumulation of electrons (holes) at the interface between the light-emitting layer and the hole (electron) transport layer. The maximum accumulated charge densities an 2X10(12) electrons/cm(2) and 3X10(11) holes/cm(2). These results highlight the carrier blocking role of monopolar transport layers and demonstrate a powerful technique to characterize multilayer organic structures. (C) 1995 American Institute of Physics. C1 UNIAX CORP,SANTA BARBARA,CA 93117. RP CAMPBELL, IH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 12 TC 69 Z9 69 U1 1 U2 14 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 NOV 20 PY 1995 VL 67 IS 21 BP 3171 EP 3173 DI 10.1063/1.115152 PG 3 WC Physics, Applied SC Physics GA TF574 UT WOS:A1995TF57400040 ER PT J AU FUKUMOTO, Y WIESMANN, HJ GARBER, M SUENAGA, M HALDAR, P AF FUKUMOTO, Y WIESMANN, HJ GARBER, M SUENAGA, M HALDAR, P TI ALTERNATING-CURRENT LOSSES IN SILVER-SHEATHED (BI,PB)(2)SR2CA2CU3O10 TAPES .2. ROLE OF INTERFILAMENTARY COUPLING SO APPLIED PHYSICS LETTERS LA English DT Article AB ac losses at 60 Hz have been measured for silver-sheathed (Bi,Pb)(2)Sr2Ca2Cu3O10 multifilamentary tapes at 27 and 77 K to investigate the role of interfilamentary coupling. The results are qualitatively well described by the use of the concept of the critical coupling length l(c). Further, it is shown that to obtain effective reduction of the coupling loss, a very small twist pitch length (much less than 1 cm) as well as a substantial reduction in the filament thickness are required for an applied ac field of, for example, 100 rms A/cm at 77 K. (C) 1995 American Institute of Physics. RP FUKUMOTO, Y (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV SCI MAT,UPTON,NY 11973, USA. NR 8 TC 31 Z9 31 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 20 PY 1995 VL 67 IS 21 BP 3180 EP 3182 DI 10.1063/1.115155 PG 3 WC Physics, Applied SC Physics GA TF574 UT WOS:A1995TF57400043 ER PT J AU FLESHLER, S CRONIS, LT CONWAY, GE MALOZEMOFF, AP PE, T MCDONALD, J CLEM, JR VELLEGO, G METRA, P AF FLESHLER, S CRONIS, LT CONWAY, GE MALOZEMOFF, AP PE, T MCDONALD, J CLEM, JR VELLEGO, G METRA, P TI MEASUREMENT OF THE AC POWER LOSS OF (BI,PB)(2)SR2CA2CU3OX COMPOSITE TAPES USING THE TRANSPORT TECHNIQUE SO APPLIED PHYSICS LETTERS LA English DT Article AB The transport self-field ac loss voltages of (Bi,Pb)(2)Sr2Ca2Cu3Ox (Bi-2223) multifilamentary tapes depend strongly on the voltage lead configuration. We have measured the loss voltage as a function of the measuring circuit loop size defined by the voltage leads and the tapes for well-defined lead geometries. The loss signal was found to reach a limiting value when the length of the loop transverse to the tape was several times the tape width. This limiting voltage represents the ''true'' self-field ac loss as predicted by new theoretical analysis. (C) 1995 American Institute of Physics. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. PIRELLI CAVI SPA,DIV ITALIA,I-20126 MILAN,ITALY. RP FLESHLER, S (reprint author), AMER SUPERCOND CORP,WESTBOROUGH,MA 01581, USA. NR 13 TC 56 Z9 58 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 NOV 20 PY 1995 VL 67 IS 21 BP 3189 EP 3191 DI 10.1063/1.115158 PG 3 WC Physics, Applied SC Physics GA TF574 UT WOS:A1995TF57400046 ER PT J AU PEREZCASTRO, AV WILSON, J ALTHERR, MR AF PEREZCASTRO, AV WILSON, J ALTHERR, MR TI GENOMIC ORGANIZATION OF THE MOUSE FIBROBLAST-GROWTH-FACTOR-RECEPTOR-3 (FGFR3) GENE SO GENOMICS LA English DT Article ID LIGAND-BINDING; FACTOR FAMILY; IMMUNOGLOBULIN DOMAIN; PROMOTER REGION; SINGLE GENE; EXPRESSION; CLONING; TRANSCRIPTION; MESODERM; XENOPUS AB The fibroblast growth factor receptor 3 (Fgfr3) protein is a tyrosine kinase receptor involved in the signal transduction of various fibroblast growth factors. Recent studies suggest its important role in normal development. In humans, mutation in Fgfr3 is responsible for growth disorders such as achondroplasia, hypo-achondroplasia, and thanatophoric dysplasia. Here, we report the complete genomic organization of the mouse Fgfr3 gene. The murine gene spans approximately 15 kb and consists of 19 exons and 18 introns. One major and one minor transcription initiation site were identified. Position +1 is located 614 nucleotides upstream from the ATG initiation codon. The translation initiation and termination sites are located in exons 2 and 19, respectively. Five Sp1 sites, two AP2 sites, one Zeste site, and one Krox 24 site were observed in the 5'-flanking region. The Fgfr3 promoter appears to be contained within a CpG island and, as is common in genes having multiple Sp1-binding sites, lacks a TATA box. (C) 1995 Academic Press, Inc. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,GENOM & STRUCT BIOL GRP,LOS ALAMOS,NM 87545. NR 34 TC 22 Z9 23 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD NOV 20 PY 1995 VL 30 IS 2 BP 157 EP 162 DI 10.1006/geno.1995.9890 PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA TG447 UT WOS:A1995TG44700004 PM 8586414 ER PT J AU GORDON, LA BERGMANN, A CHRISTENSEN, M DANGANAN, L LEE, DA ASHWORTH, LK NELSON, DO OLSEN, AS MOHRENWEISER, HW CARRANO, AV BRANDRIFF, BF AF GORDON, LA BERGMANN, A CHRISTENSEN, M DANGANAN, L LEE, DA ASHWORTH, LK NELSON, DO OLSEN, AS MOHRENWEISER, HW CARRANO, AV BRANDRIFF, BF TI A 30-MB METRIC FLUORESCENCE IN-SITU HYBRIDIZATION MAP OF HUMAN-CHROMOSOME 19Q SO GENOMICS LA English DT Article ID INSITU HYBRIDIZATION; GENE; LOCATION; REPEAT AB A high-resolution metric physical map of chromosome 19q has been constructed by fluorescence in situ hybridization. The map locates 136 cosmid reference points that span 30 Mb. The reference points are sequentially ordered from centromere to telomere, and the distance between neighboring cosmids is known from 240 partially overlapping, redundant estimates of genomic distances in kilobases separating pairs of cosmids. The average spacing between cosmid reference points is 220 kb, with over 75% of intervals less than 300 kb. Eighty-four genes and polymorphic markers have been assigned to mapped cosmids. The information on order and genomic distances separating pairs of cosmids, both key elements for building physical maps, has furthered the construction and integration of the genetic and physical maps of chromosome 19. (C) 1995 Academic Press, Inc. RP GORDON, LA (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,CTR HUMAN GENOME,POB 808,LIVERMORE,CA 94550, USA. NR 24 TC 30 Z9 30 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD NOV 20 PY 1995 VL 30 IS 2 BP 187 EP 194 DI 10.1006/geno.1995.9886 PG 8 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA TG447 UT WOS:A1995TG44700008 PM 8586418 ER PT J AU WEIER, HUG GEORGE, CX GREULICH, KM SAMUEL, CE AF WEIER, HUG GEORGE, CX GREULICH, KM SAMUEL, CE TI THE INTERFERON-INDUCIBLE, DOUBLE-STRANDED RNA-SPECIFIC ADENOSINE-DEAMINASE GENE (DSRAD) MAPS TO HUMAN-CHROMOSOME LQ21.1-21.2 SO GENOMICS LA English DT Note ID UNWINDING ACTIVITY; SUBSTRATE AB The interferon-inducible double-stranded RNA-specific adenosine deaminase is an RNA-modifying enzyme implicated in the generation of biased hypermutations of viral RNAs and the site-selective editing of mammalian mRNAs of neural origin. The gene for the dsRNA-specific adenosine deaminase has been mapped by fluorescence in situ hybridization (FISH) of genomic clones to a single locus on human chromosome 1 bands q21.1-21.2. Simultaneous multicolor FISH including lambda clones and yeast artificial chromosomes showed a localization of the gene in band 1q21 centromeric of D1S1705. (C) 1995 Academic Press, Inc. C1 UNIV CALIF SANTA BARBARA,DEPT MOLEC CELLULAR & DEV BIOL,BIOCHEM & MOLEC BIOL PROGRAM,SANTA BARBARA,CA 93106. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,CTR MOLEC CYTOGENET,BERKELEY,CA 94720. UNIV CALIF SANTA BARBARA,GRAD PROGRAM BIOCHEM & MOLEC BIOL,SANTA BARBARA,CA 93106. FU NIAID NIH HHS [AI-12520] NR 22 TC 54 Z9 56 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD NOV 20 PY 1995 VL 30 IS 2 BP 372 EP 375 DI 10.1006/geno.1995.0034 PG 4 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA TG447 UT WOS:A1995TG44700034 PM 8586444 ER PT J AU GARDINER, K ICHIKAWA, H OHKI, M PATTERSON, D CHENG, JF AF GARDINER, K ICHIKAWA, H OHKI, M PATTERSON, D CHENG, JF TI LOCALIZATION OF CDNAS TO A REGION POORLY REPRESENTED IN THE CEPH CHROMOSOME-21 YAC CONTIG - CANDIDATE GENES FOR GENETIC-DISEASES MAPPED TO 21Q22.3 SO GENOMICS LA English DT Note ID CLONES AB Fifty-three cDNA fragments previously obtained by hybridization selection from random clones in the chromosome 21 cosmid library LL21CNO2 failed to identify clones in the chromosome 21 YAC contig described by Chumakov et al. (1992, Nature 359:380-387). Using an expanded panel of somatic cell hybrids, we have verified that the majority of these cDNAs map to chromosome 21 and that in particular a very high proportion, similar to 85%, localize to a 5-Mb region of distal 21q22.3. Pulsed-field analysis coupled with information from the NotI restriction map of the region further indicate that 17 cDNA fragments map within 650 kb of the PFKL gene and thus may be candidates for genetic diseases linked to this gene. This work helps to characterize a region poorly represented in the CEPH YAC contig and adds to the number of cDNAs useful in analysis of chromosome 21-associated diseases. (C) 1995 Academic Press, Inc. C1 NATL CANC CTR,TOKYO 104,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP GARDINER, K (reprint author), ELEANOR ROOSEVELT INST,1899 GAYLORD ST,DENVER,CO 80206, USA. FU NHGRI NIH HHS [HG00001, HG00714]; NICHD NIH HHS [HD17749] NR 14 TC 17 Z9 17 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD NOV 20 PY 1995 VL 30 IS 2 BP 376 EP 379 DI 10.1006/geno.1995.0035 PG 4 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA TG447 UT WOS:A1995TG44700035 PM 8586445 ER PT J AU GUDMANDSEN, P THOMSEN, BB PEDERSEN, LT SKRIVER, H MINNETT, PJ AF GUDMANDSEN, P THOMSEN, BB PEDERSEN, LT SKRIVER, H MINNETT, PJ TI NORTHEAST WATER POLYNYA - SATELLITE-OBSERVATIONS SUMMER 1992 AND 1993 SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article AB Polynyas in the Arctic have recently attracted much attention with studies of their geophysics (including water movements, heat flux and carbon dioxide flux) and their biology (including all phases from plankton over benthos to marine mammals and polar birds). A programme of remote sensing was undertaken in connection with two cruises by research vessels in the North-East Water polynya at the north-east corner of Greenland. Data from the Advanced Very High Resolution Radiometer (AVHRR) instrument on the NOAA satellites and Synthetic Aperture Radar (SAR) on ERS-1 was used supported by ground information collected by the research vessel, USCGC Polar Sea. The observations made are reported with examples of special events that control the state of the polynya. Based on repeated observations of flees the motion pattern is determined, for 1992 by means of AVHRR and for 1993 by ERS-1 SAR. They confirm the anti-cyclonic movement around the Belgica Bank supported by a system of troughs surrounding the Bank. The influence of a storm is studied as well as that of the break-off of major parts of the shorefast ice that limit the polynya in the north and the south. On this basis the maintenance of the polynya during the summer is discussed and the possible influence of these barriers. They are probably very important for the existence and the extent of the polynya. The periods studied are considered too short to reveal conclusive results and they give only a hint of what happens during the winters preceding the opening of the polynya in spring. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973. RP GUDMANDSEN, P (reprint author), TECH UNIV DENMARK,INST ELECTROMAGNET,REMOTE SENSING UNIT,DK-2800 LYNGBY,DENMARK. NR 20 TC 8 Z9 8 U1 0 U2 2 PU TAYLOR & FRANCIS LTD LONDON PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD NOV 20 PY 1995 VL 16 IS 17 BP 3307 EP 3324 PG 18 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA TH689 UT WOS:A1995TH68900008 ER PT J AU ROBERTS, JM TANNER, RL NEWMAN, L BOWERSOX, VC BOTTENHEIM, JW ANLAUF, KG BRICE, KA PARRISH, DD FEHSENFELD, FC BUHR, MP MEAGHER, JF BAILEY, EM AF ROBERTS, JM TANNER, RL NEWMAN, L BOWERSOX, VC BOTTENHEIM, JW ANLAUF, KG BRICE, KA PARRISH, DD FEHSENFELD, FC BUHR, MP MEAGHER, JF BAILEY, EM TI RELATIONSHIPS BETWEEN PAN AND OZONE AT SITES IN EASTERN NORTH-AMERICA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID PEROXYACETYL NITRATE PAN; ORGANIC NITRATES; UNITED-STATES; TROPOSPHERIC OZONE; REACTIVE NITROGEN; NIWOT RIDGE; AIR; NOY; DEPOSITION; ABSORPTION AB Measurements of ozone and PAN (peroxyacetic nitric anhydride) were made at four sites in eastern North America; Bondville, Illinois, Egbert, Ontario, Scotia, Pennsylvania, and Whitetop Mountain, Virginia., in July and August of 1988 as part of a study of regional oxidant photochemistry. The concentrations of PAN ranged from <0.010 to 9.2 parts-per-billion by volume (ppbv) and those of O-3 ranged from <2 to 139 ppbv. Diurnal concentration profiles showed PAN and O-3 to be removed within nocturnal boundary layers, especially if nitric oxide was present, and that O-3 was, for most sites, more rapidly removed than PAN. The only mountain top site at which PAN was measured showed distinctly different diurnal profiles in which O-3 was actually higher at night, suggesting that convective flow driven by surface cooling served to transport air down from higher in the mixed layer at night. The afternoon production of PAN and O-3 was also apparent and led to an overall Linear correlation of O-3 and PAN between the hours of 1300 and 1800. The comparison of this result with other measurements, estimates of PAN formation rates, and model calculations indicates that the production of PAN relative to ozone is far greater (x3) than can be accounted for by acetaldehyde reactions with OH, there is a wide disparity in model descriptions of PAN production, and confirms the non-linear dependence of O-3 production on NOX. C1 BROOKHAVEN NATL LAB, DEPT APPL SCI, DIV ENVIRONM CHEM, UPTON, NY 11973 USA. ILLINOIS STATE WATER SURVEY, ATMOSPHAR CHEM SECT, CHAMPAIGN, IL 61820 USA. ATMOSPHER ENVIRONM SERV, DOWNSVIEW, ON M3H 5T4, CANADA. CONCORD SCI CORP, N YORK, ON, CANADA. UNIV COLORADO, NOAA, COOPERAT INST RES ENVIRONM SCI, BOULDER, CO 80309 USA. TENNESSEE VALLEY AUTHOR, MUSCLE SHOALS, AL 35660 USA. RP ROBERTS, JM (reprint author), NOAA, AERON LAB, 325 BROADWAY, BOULDER, CO 80303 USA. RI Roberts, James/A-1082-2009; Parrish, David/E-8957-2010; Fehsenfeld, Frederick/I-4876-2013 OI Roberts, James/0000-0002-8485-8172; Parrish, David/0000-0001-6312-2724; NR 63 TC 30 Z9 30 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1995 VL 100 IS D11 BP 22821 EP 22830 DI 10.1029/95JD01221 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA TF791 UT WOS:A1995TF79100007 ER PT J AU LEE, HN FEICHTER, J AF LEE, HN FEICHTER, J TI AN INTERCOMPARISON OF WET PRECIPITATION SCAVENGING SCHEMES AND THE EMISSION RATES OF RN-222 FOR THE SIMULATION OF GLOBAL TRANSPORT AND DEPOSITION OF PB-210 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID GENERAL-CIRCULATION MODEL; 3-DIMENSIONAL SIMULATION; RESIDENCE TIMES; RADON; AEROSOLS; FLUXES; TROPOSPHERE; ATMOSPHERE; NITROGEN; PRODUCTS AB We simulated the transport of Rn-222 and its progeny Pb-210 using a global three-dimensional atmospheric tracer transport model. The purpose of this study was to understand the effects of wet deposition scavenging processes and the emission rate of Rn-222 On the global transport and deposition of Pb-210. We examined the deposition of Pb-210 aerosols due to wet scavenging in stratiform and convective precipitation. Four schemes for wet precipitation scavenging removal, and two assumed distributions of the emission rate of Rn-222, were studied and tested. One was assumed to have a global constant rate and in the other the constant rate was assumed to have changed with latitude. The results of the model simulations were compared with archived radionuclide data measurements from the Environmental Measurements Laboratory's global network of sampling stations. The model-calculated global distributions of the yearly mean of the surface air concentrations of Rn-222 and Pb-210, and the yearly mean total deposition of Pb-210 for 1986 data for each wet precipitation scavenging scheme studied are presented. For each scheme, we have also compared yearly mean total deposition and monthly averages of the surface air concentrations and the vertical distributions of Pb-210 with the measurements. We found that the Walton et al. (1988) scheme produces the best results of the four schemes studied. Although this scheme, when utilizing a constant emission rate, gives satisfactory results, use of an emission rate that changes with latitudes improves the bias of this scheme, particularly at high northern latitude sites. The model comparisons with the measurements helped us to validate and improve the model. This atmospheric tracer transport model can be used for the simulation of other radionuclide and nonradionuclide tracers for future studies related to global climate change. C1 MAX PLANCK INST METEOROL, HAMBURG, GERMANY. RP LEE, HN (reprint author), US DOE, ENVIRONM MEASUREMENTS LAB, 376 HUDSON ST, NEW YORK, NY 10014 USA. NR 36 TC 27 Z9 28 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1995 VL 100 IS D11 BP 23253 EP 23270 DI 10.1029/95JD01732 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA TF791 UT WOS:A1995TF79100044 ER PT J AU RABSON, DA TRUGMAN, SA AF RABSON, DA TRUGMAN, SA TI A SPIN MODEL FOR INVESTIGATING CHIRALITY SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID TRIANGULAR-LATTICE; HEISENBERG-ANTIFERROMAGNET; ORDER; DISORDER; SYSTEMS; STATES; PHASES; CHAIN AB Spin chirality has generated great interest recently both from possible applications to flux phases and intrinsically, as an example of a several-site magnetic order parameter that can be long ranged even where simpler order parameters are not. Previous work (motivated by the flux phases) has focused on antiferromagnetic chiral order; we construct a model in which the chirality orders ferromagnetically and investigate the model's behaviour as a function of spin. Enlisting the aid of exact diagonalization, spin waves, perturbation theory, and mean fields, we conclude that the model probably has long-ranged chiral order for spins 1 and greater and no non-trivial chiral order for spin 1/2. C1 LOS ALAMOS NATL LAB,CONDENSED MATTER THEORY GRP,MS B262,LOS ALAMOS,NM 87545. NR 29 TC 1 Z9 1 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD NOV 20 PY 1995 VL 7 IS 47 BP 9005 EP 9020 DI 10.1088/0953-8984/7/47/019 PG 16 WC Physics, Condensed Matter SC Physics GA TG179 UT WOS:A1995TG17900019 ER PT J AU BINETRUY, P GAILLARD, MK TAYLOR, TR AF BINETRUY, P GAILLARD, MK TAYLOR, TR TI DYNAMICAL SUPERSYMMETRY BREAKING AND THE LINEAR MULTIPLET SO NUCLEAR PHYSICS B LA English DT Article ID ANTISYMMETRIC TENSOR; SUPERSTRING MODELS; N=1 SUPERGRAVITY; MATTER SYSTEM; 4 DIMENSIONS; MECHANISM AB We analyze gaugino condensation in the presence of a dilaton and an antisymmetric tensor field, with couplings reminiscent of string theories, The degrees of freedom relevant to a supersymmetric description of the effective theory below the scale of condensation are discussed in this context. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORY GRP,BERKELEY,CA 94720. NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115. RP BINETRUY, P (reprint author), UNIV PARIS 11,PHYS THEOR & HAUTES ENERGIES LAB,CNRS,URA D0063,F-91405 ORSAY,FRANCE. NR 24 TC 29 Z9 29 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 NOV 20 PY 1995 VL 455 IS 1-2 BP 97 EP 108 DI 10.1016/0550-3213(95)00494-D PG 12 WC Physics, Particles & Fields SC Physics GA TF821 UT WOS:A1995TF82100006 ER PT J AU ATWOOD, D REINA, L SONI, A AF ATWOOD, D REINA, L SONI, A TI FLAVOR-CHANGING NEUTRAL SCALAR CURRENTS AT MU(+)MU(-) COLLIDERS SO PHYSICAL REVIEW LETTERS LA English DT Article ID BBAR-MESON DECAY; TOP QUARK; QCD-CORRECTIONS; MODELS; B->S-GAMMA; STANDARD AB The prospect of observing the decay H --> t (c) over bar of a neutral Higgs produced via the s channel and its subsequent decay into t (c) over bar is considered at a mu(+)mu(-) collider. In the context of a two Higgs doubler model with flavor-changing couplings, it is found that for many values of the model parameters such tree-level flavor changing decays will be produced at an observable level. Studies of the helicity of the top will also allow the determination of the relative strengths of the flavor-changing couplings, and these may be measured with about 10(3) events. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP ATWOOD, D (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 40 TC 75 Z9 75 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 NOV 20 PY 1995 VL 75 IS 21 BP 3800 EP 3803 DI 10.1103/PhysRevLett.75.3800 PG 4 WC Physics, Multidisciplinary SC Physics GA TF246 UT WOS:A1995TF24600005 ER PT J AU ALBER, T APPELSHAUSER, H BACHLER, J BARTKE, J BIALKOWSKA, H BIESER, F BLOOMER, MA BLYTH, CO ROCK, R BORMANN, C BRADY, FP BROCKMANN, R BUNCIC, P CAINES, HL CEBRA, D CHAN, P COOPER, GE CRAMER, JG CRAMER, PB CSATO, P DERADO, I DUNN, J ECKARDT, V ECKHARDT, F EULER, S FERGUSON, MI FISCHER, HG FODOR, Z FOKA, P FREUND, P FUCHS, M GAL, J GAZDZICKI, M GLADYSZ, E GREBIESZKOW, J GUNTHER, J HARRIS, JW HECK, W HEGYI, S HILL, LA HUANG, I HOWE, MA IGO, G IRMSCHER, D JACOBS, P JONES, PG KADIJA, K KECSKEMETI, J KOWALSKI, M KUHMICHEL, A LASIUK, B MARGETIS, S MITCHELL, JW MOCK, A NELSON, JM ODYNIEC, G PALINKAS, J PALLA, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSKANZER, AM PRINDLE, DJ PUHLHOFER, F RAUCH, W RENFORDT, R RETYK, W RITTER, HG ROHRICH, D RUDOLPH, H RUNGE, K SANDOVAL, A SANN, H SCHAFER, E SCHMITZ, N SCHONFELDER, S SEYBOTH, P SEYERLEIN, J SIKLER, F SKRZYPCZAK, E STOCK, R STROBELE, H SZENTPETERY, I SZIKLAI, J TOY, M TRAINOR, TA TRENTALANGE, S VASSILIOU, M VESZTERGOMBI, G VRANIC, D WENIG, S WHITTEN, C WIENOLD, T WOOD, L ZIMANYI, J ZHU, XZ ZYBERT, R AF ALBER, T APPELSHAUSER, H BACHLER, J BARTKE, J BIALKOWSKA, H BIESER, F BLOOMER, MA BLYTH, CO ROCK, R BORMANN, C BRADY, FP BROCKMANN, R BUNCIC, P CAINES, HL CEBRA, D CHAN, P COOPER, GE CRAMER, JG CRAMER, PB CSATO, P DERADO, I DUNN, J ECKARDT, V ECKHARDT, F EULER, S FERGUSON, MI FISCHER, HG FODOR, Z FOKA, P FREUND, P FUCHS, M GAL, J GAZDZICKI, M GLADYSZ, E GREBIESZKOW, J GUNTHER, J HARRIS, JW HECK, W HEGYI, S HILL, LA HUANG, I HOWE, MA IGO, G IRMSCHER, D JACOBS, P JONES, PG KADIJA, K KECSKEMETI, J KOWALSKI, M KUHMICHEL, A LASIUK, B MARGETIS, S MITCHELL, JW MOCK, A NELSON, JM ODYNIEC, G PALINKAS, J PALLA, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSKANZER, AM PRINDLE, DJ PUHLHOFER, F RAUCH, W RENFORDT, R RETYK, W RITTER, HG ROHRICH, D RUDOLPH, H RUNGE, K SANDOVAL, A SANN, H SCHAFER, E SCHMITZ, N SCHONFELDER, S SEYBOTH, P SEYERLEIN, J SIKLER, F SKRZYPCZAK, E STOCK, R STROBELE, H SZENTPETERY, I SZIKLAI, J TOY, M TRAINOR, TA TRENTALANGE, S VASSILIOU, M VESZTERGOMBI, G VRANIC, D WENIG, S WHITTEN, C WIENOLD, T WOOD, L ZIMANYI, J ZHU, XZ ZYBERT, R TI TRANSVERSE ENERGY-PRODUCTION IN PB-208+PB COLLISIONS AT 158 GEV PER NUCLEON SO PHYSICAL REVIEW LETTERS LA English DT Article AB Measurements of the forward and the transverse energy in 158 GeV per nucleon Pb-208 + Pb collisions are presented. A total transverse energy of about 1 TeV is created in central collisions. An energy density of about 3 GeV/fm(3) is estimated for near head-on collisions. Only statistical fluctuations are seen in the ratio of electromagnetic to hadronic transverse energy. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV BIRMINGHAM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND. TECH UNIV BUDAPEST, INST PHYS, H-1521 BUDAPEST, HUNGARY. CERN, CH-1211 GENEVA, SWITZERLAND. INST PHYS NUCL, KRAKOW, POLAND. GESELL SCHWERIONENFORSCH MBH, W-6100 DARMSTADT, GERMANY. UNIV CALIF DAVIS, DAVIS, CA 95616 USA. UNIV FRANKFURT, FACHBEREICH PHYS, W-6000 FRANKFURT, GERMANY. UNIV FREIBURG, FACHBEREICH PHYS, FREIBURG, GERMANY. INST NUCL STUDIES, PL-00681 WARSAW, POLAND. UNIV WARSAW, INST EXPTL PHYS, WARSAW, POLAND. UNIV WASHINGTON, NUCL PHYS LAB, SEATTLE, WA USA. RUDJER BOSKOVIC INST, ZAGREB, CROATIA. UNIV ATHENS, DEPT PHYS, ATHENS, GREECE. RP ALBER, T (reprint author), MAX PLANCK INST PHYS & ASTROPHYS, MUNICH, GERMANY. RI Palinkas, Jozsef/B-2993-2011 NR 11 TC 143 Z9 145 U1 0 U2 0 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 NOV 20 PY 1995 VL 75 IS 21 BP 3814 EP 3817 DI 10.1103/PhysRevLett.75.3814 PG 4 WC Physics, Multidisciplinary SC Physics GA TF246 UT WOS:A1995TF24600008 ER PT J AU DUNNE, M BORGHESI, M IWASE, A JONES, MW TAYLOR, R GIBSON, R GOLDMAN, SR MACK, J WATT, RG AF DUNNE, M BORGHESI, M IWASE, A JONES, MW TAYLOR, R GIBSON, R GOLDMAN, SR MACK, J WATT, RG TI EVALUATION OF A FOAM BUFFER TARGET DESIGN FOR SPATIALLY UNIFORM ABLATION OF LASER-IRRADIATED PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSTABILITY; INCOHERENCE; BEAM AB Experimental observations are presented demonstrating that the use of a gold-coated foam layer on the surface of a laser-driven target substantially reduces its hydrodynamic breakup during the acceleration phase. The data suggest that this results from enhanced thermal smoothing during the early-time imprint stage of the interaction. The target's kinetic energy and the level of parametric instability growth are shown to remain essentially unchanged from that of a conventionally driven target. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,LONDON SW7 2BZ,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RI Borghesi, Marco/K-2974-2012; Dunne, Mike/B-4318-2014 OI Dunne, Mike/0000-0001-8740-3870 NR 15 TC 64 Z9 65 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 NOV 20 PY 1995 VL 75 IS 21 BP 3858 EP 3861 DI 10.1103/PhysRevLett.75.3858 PG 4 WC Physics, Multidisciplinary SC Physics GA TF246 UT WOS:A1995TF24600019 ER PT J AU STERN, EA SIEGEL, RW NEWVILLE, M SANDERS, PG HASKEL, D AF STERN, EA SIEGEL, RW NEWVILLE, M SANDERS, PG HASKEL, D TI ARE NANOPHASE GRAIN-BOUNDARIES ANOMALOUS SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXAFS AB The grain boundary regions of nanophase Cu metal are investigated using the x-ray absorption fine structure (XAFS) technique. Typical samples made by standard techniques need to be greatly thinned if measured in transmission in order to eliminate experimental artifacts which erroneously lower the apparent coordination number. To avoid this problem the samples were measured by the total electron yield technique. The results indicate a grain boundary structure which, on the average, is similar to that in conventional polycrystalline Cu, contrary to previous XAFS measurements made in transmission which indicated a lower coordination number. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RP STERN, EA (reprint author), UNIV WASHINGTON,DEPT PHYS,FM-15,SEATTLE,WA 98195, USA. NR 22 TC 109 Z9 110 U1 2 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 NOV 20 PY 1995 VL 75 IS 21 BP 3874 EP 3877 DI 10.1103/PhysRevLett.75.3874 PG 4 WC Physics, Multidisciplinary SC Physics GA TF246 UT WOS:A1995TF24600023 ER PT J AU BEAUCHAMP, KM ROSENBAUM, TF WELP, U CRABTREE, GW VINOKUR, VM AF BEAUCHAMP, KM ROSENBAUM, TF WELP, U CRABTREE, GW VINOKUR, VM TI VORTEX LOCK-IN DEEP IN THE BOSE GLASS SO PHYSICAL REVIEW LETTERS LA English DT Article ID COLUMNAR DEFECTS; MAGNETIC-RELAXATION; YBA2CU3O7 CRYSTALS; CU-O; QUANTUM; SUPERCONDUCTORS; VORTICES; FIELD; LOCALIZATION; IRRADIATION AB We use a Bi gaussmeter of micron dimensions to explore the magnetic field dependence of the magnetization relaxation rate and the critical current down to millikelvin temperatures in untwinned single crystals of YBa2Cu3O7-delta With columnar defects. The response separates into three regimes as a function of the ratio of vortex density to columnar defect density B/B-phi: enhancements in both critical current and quantum creep in the dilute limit, vanishing magnetization relaxation at the matching density (the proposed ''Mott insulator'' phase line), and the emergence of temperature-dependent vortex motion for B much greater than B-phi. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BEAUCHAMP, KM (reprint author), UNIV CHICAGO,JAMES FRANCK INST,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 32 TC 42 Z9 42 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 NOV 20 PY 1995 VL 75 IS 21 BP 3942 EP 3945 DI 10.1103/PhysRevLett.75.3942 PG 4 WC Physics, Multidisciplinary SC Physics GA TF246 UT WOS:A1995TF24600040 ER PT J AU NIETO, MM TRUAX, DR AF NIETO, MM TRUAX, DR TI ARBITRARY-ORDER HERMITE GENERATING-FUNCTIONS FOR OBTAINING ARBITRARY-ORDER COHERENT AND SQUEEZED STATES SO PHYSICS LETTERS A LA English DT Article AB For use in calculating higher-order coherent- and squeezed-state quantities, we derive generalized generating functions for the Hermite polynomials. They are given by Sigma(n=0)(infinity)z(jn+k)H(jn+k)(x)/(jn + k)!, for arbitrary integers j greater than or equal to 1 and k greater than or equal to 0. Along the way, the sums with the Hermite polynomials replaced by unity are also obtained. We also evaluate the action of the operators exp[c(j)(d/dx)(j)] on well-behaved functions and apply them to obtain other sums. Then the generating functions Sigma(n=0)(infinity)z(jn+k)H(jn+k)(x)H-jn+k(y)/(jn + k)! are obtained. Finally, our techniques are used to define arbitrary-order coherent and squeezed states, i.e., those obtained from ladder operators of the form a(j). C1 UNIV CALGARY,DEPT CHEM,CALGARY,AB T2N 1N4,CANADA. RP NIETO, MM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 18 TC 28 Z9 28 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 NOV 20 PY 1995 VL 208 IS 1-2 BP 8 EP 16 DI 10.1016/0375-9601(95)00761-Q PG 9 WC Physics, Multidisciplinary SC Physics GA TF787 UT WOS:A1995TF78700002 ER PT J AU GOUDER, T COLMENARES, CA NAEGELE, JR AF GOUDER, T COLMENARES, CA NAEGELE, JR TI A SURFACE SPECTROSCOPY STUDY OF U OVERLAYERS ON GRAPHITE SO SURFACE SCIENCE LA English DT Article DE CARBON; DIFFUSION AND MIGRATION; METALLIC FILMS; PHOTOELECTRON SPECTROSCOPY; POLYCRYSTALLINE SURFACES; POLYCRYSTALLINE THIN FILMS; SPUTTER DEPOSITION; URANIUM ID ELECTRONIC-STRUCTURE; METAL-CLUSTERS; 5F ELECTRONS; PHOTOEMISSION; LOCALIZATION; URANIUM; SPECTRA AB X-ray and ultra violet photoelectron spectroscopies (XPS and UPS, respectively) have been used to study U overlayers deposited on graphite by magnetron and straight diode sputtering. We investigated the mode of growth, the electronic structure of the U phase and overlayer-substrate reactions after deposition and annealing. At submonolayer coverage U deposits as clusters pointing to a low overlayer-substrate interaction. With increasing dosage, U clusters agglomerate forming eventually a continuous U overlayer. At low U dosage, U 4f and valence band spectra exhibit correlation satellites which are attributed to the narrowing of the 5f bands and eventual 5f localization, because of the decreased coordination of U atoms. In thicker overlayers these satellites are missing, showing U to have the same electronic structure as in bulk U metal. Even immediately after deposition some of the surface carbon loses its graphitic character and becomes carbidic, which is mainly attributed to a weak interaction between surface U and the graphite substrate. Annealing at 600 degrees C results in further reaction between U and graphite, and leads to the formation of UC. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP GOUDER, T (reprint author), COMMISS EUROPEAN COMMUNITIES, JOINT RES CTR, INST TRANSURANIUM ELEMENTS, POSTFACH 2340, D-76125 KARLSRUHE, GERMANY. NR 27 TC 18 Z9 23 U1 3 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 20 PY 1995 VL 342 IS 1-3 BP 299 EP 306 DI 10.1016/0039-6028(95)00763-6 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA TH886 UT WOS:A1995TH88600037 ER PT J AU REISFELD, G STRONGIN, M AF REISFELD, G STRONGIN, M TI A NEW TECHNIQUE FOR STUDYING SURFACE-REACTIONS - THE REACTION OF HYDROGEN WITH HIGH-PRESSURE OXYGEN ON PALLADIUM SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PD(111) SURFACE; ADSORPTION; PD(100); FILMS; NIOBIUM; TDS AB We present a new technique for studying the interaction of hydrogen with high pressure co-reactants on surfaces. The sample consists of a thin Nb layer covered with a layer containing the reactive surface (i.e. Pd). The Nb layer is charged with hydrogen, and both the film resistance and the hydrogen concentration (volumetric uptake measurements) are recorded. After loading the sample with hydrogen the sample is exposed to a high pressure of the reactant (< 1 atmosphere of oxygen). After calibrating the Nb resistance against the hydrogen concentration the change in resistance is then used to monitor the rate at which hydrogen reacts with oxygen. RP REISFELD, G (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. 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 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 17 PY 1995 VL 246 IS 1-2 BP 85 EP 89 DI 10.1016/0009-2614(95)01091-M PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE595 UT WOS:A1995TE59500014 ER PT J AU HEADGORDON, M MAURICE, D OUMI, M AF HEADGORDON, M MAURICE, D OUMI, M TI A PERTURBATIVE CORRECTION TO RESTRICTED OPEN-SHELL CONFIGURATION-INTERACTION WITH SINGLE SUBSTITUTIONS FOR EXCITED-STATES OF RADICALS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID EXCITATION-ENERGIES AB A perturbative correction, termed RCIS(D), to restricted open shell single excitation configuration interaction (ROCIS) is formulated and implemented for excited states of radicals. RCIS(D) gives spin-pure energies (but not wavefunctions), is size-consistent, and has computational complexity scaling with the fifth power of molecular size. All these properties are analogous to second order restricted Moller-Plesset theory for the ground state. Comparison of calculated vertical excitation energies against experiment for a diverse series of small radicals, BeH, BeF, CH, CH3, CN, CO+, NO and OH, suggests that RCIS(D) constitutes a useful improvement over ROCIS. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP HEADGORDON, M (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 30 TC 99 Z9 99 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 17 PY 1995 VL 246 IS 1-2 BP 114 EP 121 DI 10.1016/0009-2614(95)01111-L PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE595 UT WOS:A1995TE59500019 ER PT J AU TASI, LH AF TASI, LH TI THE MODIFIED DIFFERENCING METHOD FOR THE SET PARTITIONING PROBLEM WITH CARDINALITY CONSTRAINTS SO DISCRETE APPLIED MATHEMATICS LA English DT Article AB The set partitioning problem requires partitioning a set of n numbers into K subsets so that the difference between the maximum and minimum subset sums is minimized. This paper investigates the problem with the additional constraint that the subset cardinalities should be as balanced as possible. It modifies the differencing method of Karmarkar and Karp to ensure that the cardinality of each subset is either [n/K] or [n/K]. The modified algorithm preserves the asymptotic quality of the differencing method, that is, the difference between the maximum and minimum subset sums does not exceed n(-clogn), almost surely. RP TASI, LH (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 5 TC 7 Z9 7 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X J9 DISCRETE APPL MATH JI Discret Appl. Math. PD NOV 17 PY 1995 VL 63 IS 2 BP 175 EP 180 DI 10.1016/0166-218X(94)00032-9 PG 6 WC Mathematics, Applied SC Mathematics GA TF533 UT WOS:A1995TF53300006 ER PT J AU GURLEY, LR VALDEZ, JG BUCHANAN, JS AF GURLEY, LR VALDEZ, JG BUCHANAN, JS TI CHARACTERIZATION OF THE MITOTIC SPECIFIC PHOSPHORYLATION SITE OF HISTONE-H1 - ABSENCE OF A CONSENSUS SEQUENCE FOR THE P34(CDC2)/CYCLIN-B-KINASE SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID LYSINE-RICH HISTONE; AMINO-ACID-SEQUENCE; CELL-CYCLE; CHROMOSOME CONDENSATION; MESSENGER-RNA; H-1 HISTONE; CHROMATIN; DERIVATIZATION; VARIANT; REGIONS AB P-32-Labeled histone H1 was isolated from synchronized Chinese hamster (line CHO) cells, subjected to tryptic digestion, and fractionated into 15 phosphopeptides by high performance liquid chromatography. These phosphopeptides were grouped into five classes having different cell cycle phosphorylation kinetics: 1) peptides reaching a maximum phosphorylation rate in S and then declining in G(2) and M, 2) peptides reaching a maximum phosphorylation rate in G(2) and then remaining constant or declining in M, 3) peptides with increasing phosphorylation throughout S and G(2) and reaching a maximum in M, 4) one peptide that was phosphorylated only in M, and 5) peptides that had low levels of phosphorylation that remained constant throughout the cell cycle, Amino acid analysis and sequencing demonstrated that the mitotic specific H1 phosphopeptide was the 16-amino acid, N-terminal, tryptic peptide Ac-SETAPAAPAAAPPAEK of the H1-1 class, This peptide, which is phosphorylated on both the Ser and Thr, does not contain the consensus sequence (S/T)PXZ (where X is any amino acid and Z is a basic amino acid), This sequence is thought to be required by the p34(cdc2)/cyclin B kinase that has maximum phosphorylating activity in mitosis, These data indicate that this kinase either does not have an obligatory requirement for the consensus sequence in vivo as generally believed or that it is not the enzyme responsible for the mitotic specific H1 phosphorylation. RP GURLEY, LR (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,MAILSTOP M-880,LOS ALAMOS,NM 87545, USA. NR 37 TC 48 Z9 48 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD NOV 17 PY 1995 VL 270 IS 46 BP 27653 EP 27660 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TE736 UT WOS:A1995TE73600041 PM 7499230 ER PT J AU THAN, C MORIMOTO, H ANDRES, H WILLIAMS, PG AF THAN, C MORIMOTO, H ANDRES, H WILLIAMS, PG TI PREPARATION, NMR CHARACTERIZATION, AND LABELING REACTIONS OF TRITIATED BORANE-THF COMPLEX AT HIGH SPECIFIC RADIOACTIVITY SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID SELECTIVE REDUCTIONS; FUNCTIONAL GROUPS; TETRAHYDROFURAN; DIBORANE; ALCOHOLS AB Borane-tetrahydrofuran complex is a selective, electrophilic reducing agent. We report a simple and facile synthesis of tritiated borane-THF complex at high specific radioactivity. Li-H-3, synthesized from carrier-free tritium gas and dispersed in dry tetrahydrofuran, was treated with boron trifluoride etherate to produce borane-THF complex (ca. 3060 GBq/mmol). (The maximum theoretical specific radioactivity of tritium is 1063 GBq/milliatom = 28.76 Ci/milliatom.) This complex was used in an exemplary reduction of 2-naphthoic acid to 2-naphthalenemethanol, in high yield. Both the borane-THF complex and the reduction product were characterized by a combination of H-1, H-3, and B-11 NMR techniques, as appropriate. The reduction product was found to have >94% of the maximum theoretical specific radioactivity, and all of the tritium at the reduced position. C1 SANDOZ PHARMA LTD,CHEM RES & DEV,CH-4002 BASEL,SWITZERLAND. RP THAN, C (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,NATL TRITIUM LABELLING FACIL,BERKELEY,CA 94720, USA. NR 30 TC 10 Z9 10 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD NOV 17 PY 1995 VL 60 IS 23 BP 7503 EP 7507 DI 10.1021/jo00128a023 PG 5 WC Chemistry, Organic SC Chemistry GA TF699 UT WOS:A1995TF69900023 ER PT J AU HOLTZMAN, S AF HOLTZMAN, S TI TEST ANIMALS AND RISK SO SCIENCE LA English DT Letter RP HOLTZMAN, S (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 17 PY 1995 VL 270 IS 5239 BP 1101 EP 1101 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TE905 UT WOS:A1995TE90500003 PM 7502020 ER PT J AU SCHELLER, MK COMPTON, RN CEDERBAUM, LS AF SCHELLER, MK COMPTON, RN CEDERBAUM, LS TI GAS-PHASE MULTIPLY-CHARGED ANIONS SO SCIENCE LA English DT Article ID NEGATIVE-IONS; IONIZATION-POTENTIALS; ELECTRON-AFFINITIES; MASS-SPECTROMETRY; THRESHOLD PHOTODETACHMENT; COLLISIONAL IONIZATION; CLUSTER IONS; MOLECULES; EXISTENCE; ATOMS AB Singly charged negative ions in the gas phase have attracted considerable experimental and theoretical attention over the past decades. However, the existence of free doubly or multiply charged negative ions, in particular those of small systems, has remained a curiosity and a matter of some controversy, Recent experimental and quantum mechanical studies show that multiply charged negative ions of small molecules and clusters can exist as isolated entities. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV HEIDELBERG,INST PHYS CHEM,NEUENHEIMER FELD 253,D-69120 HEIDELBERG,GERMANY. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. NR 71 TC 310 Z9 310 U1 8 U2 34 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 17 PY 1995 VL 270 IS 5239 BP 1160 EP 1166 DI 10.1126/science.270.5239.1160 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TE905 UT WOS:A1995TE90500045 ER PT J AU SHAPIRO, CS AF SHAPIRO, CS TI FRENCH NUCLEAR TESTS AT MURUROA SO NATURE LA English DT Letter RP SHAPIRO, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV REG ATMOSPHER SCI,POB 808,L-262,LIVERMORE,CA 94551, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 16 PY 1995 VL 378 IS 6554 BP 230 EP 230 DI 10.1038/378230a0 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TE858 UT WOS:A1995TE85800019 ER PT J AU KORBER, BTM LEARN, G MULLINS, JI HAHN, BH WOLINSKY, S AF KORBER, BTM LEARN, G MULLINS, JI HAHN, BH WOLINSKY, S TI PROTECTING HIV DATABASES SO NATURE LA English DT Letter ID PRINCIPAL NEUTRALIZING DETERMINANT; IMMUNODEFICIENCY-VIRUS TYPE-1; STRUCTURAL ELEMENTS; CONSERVED SEQUENCE; PRIMARY INFECTION C1 UNIV WASHINGTON,DEPT MICROBIOL,SEATTLE,WA 98195. UNIV WASHINGTON,DEPT MED,SEATTLE,WA 98195. UNIV ALABAMA,DEPT MED,BIRMINGHAM,AL 35294. UNIV ALABAMA,DEPT MICROBIOL,BIRMINGHAM,AL 35294. NORTHWESTERN UNIV,SCH MED,DEPT MED,DIV INFECT DIS,CHICAGO,IL 60611. SANTA FE INST,SANTA FE,NM 87500. RP KORBER, BTM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Wolinsky, Steven/B-2893-2012; OI Korber, Bette/0000-0002-2026-5757 NR 15 TC 50 Z9 51 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 16 PY 1995 VL 378 IS 6554 BP 242 EP 243 DI 10.1038/378242a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TE858 UT WOS:A1995TE85800035 PM 7477340 ER PT J AU Kisker, DW Stephenson, GB Kamiya, I Fuoss, PH Aspnes, DE Mantese, L Brennan, S AF Kisker, DW Stephenson, GB Kamiya, I Fuoss, PH Aspnes, DE Mantese, L Brennan, S TI Investigation of the relationship between reflectance difference spectroscopy and surface structure using grazing incidence X-ray scattering SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article; Proceedings Paper CT US/European Workshop on Optical Characterization of Electronic Materils CY OCT 05-07, 1994 CL HALLE, GERMANY ID MOLECULAR-BEAM EPITAXY; VAPOR-PHASE EPITAXY; 001 GAAS; GROWTH; RECONSTRUCTIONS AB In this work, in-situ grazing incidence X-ray scattering is used to correlate surface structures observed during organometallic vapor phase growth of GaAs with in-situ optical measurements using reflectance difference spectroscopy (RDS). Our observations of several reconstructions confirm that RDS signals vary among the different surfaces present under vapor phase epitaxy conditions, as also occurs under ultra-high vacuum growth conditions. In addition, the simultaneous observation of intensity oscillations in the X-ray scattering signal and the reflectance difference signal indicates that both of these techniques can be used to monitor layer-by-layer growth processes under some conditions. C1 N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. AT&T BELL LABS,MURRAY HILL,NJ 07974. STANFORD SYNCHROTRON RADIAT LAB,MENLO PK,CA. RP Kisker, DW (reprint author), IBM CORP,DIV RES,POB 218,YORKTOWN HTS,NY 10598, USA. NR 20 TC 36 Z9 36 U1 1 U2 7 PU AKADEMIE VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0031-8965 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Res. PD NOV 16 PY 1995 VL 152 IS 1 BP 9 EP 21 DI 10.1002/pssa.2211520102 PG 13 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TN967 UT WOS:A1995TN96700001 ER PT J AU CORIANO, C PARWANI, RR AF CORIANO, C PARWANI, RR TI THE ELECTRIC CHARGE OF A DIRAC MONOPOLE AT NONZERO TEMPERATURE SO PHYSICS LETTERS B LA English DT Article ID QUANTUM-FIELD-THEORY; PARTICLE; STRINGS AB We study the effect of nonzero temperature on the induced electric charge around a Dirac monopole. While at zero temperature the charge is known to be proportional to a CP violating theta parameter, we find that at high temperature the charge is proportional to sin theta. Other features of the charge at nonzero temperature are discussed. We also compute the induced charge at nonzero temperature around an Aharonov-Bohm flux string in 2 + 1 dimensions and compare the result with an index theorem, and also with the electron-monopole problem in 3 + 1 dimensions. C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. INST PHYS,BHUBANESWAR 751005,ORISSA,INDIA. OI Coriano', Claudio/0000-0003-0479-8075 NR 15 TC 12 Z9 12 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 NOV 16 PY 1995 VL 363 IS 1-2 BP 71 EP 75 DI 10.1016/0370-2693(95)01185-S PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TE608 UT WOS:A1995TE60800013 ER PT J AU ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALPAT, B ALCARAZ, J ALLABY, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDREEV, VP ANGELESCU, T ANTREASYAN, D AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BARILLERE, R BARONE, L BARTALINI, P BASCHIROTTO, A BASILE, M BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F 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 BOUCHAM, A BOURILKOV, D BOURQUIN, M BOUTIGNY, D BRACCINI, S BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BUIJS, A BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M ROMEO, GC CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLINI, G CASTELLO, R CAVALLARI, F CAVALLO, N CECCHI, C CERRADA, M CESARONI, F CHAMIZO, M CHAN, A CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CIFARELLI, L CINDOLO, F CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLIJN, AP COLINO, N COMMICHAU, V COSTANTINI, S COTOROBAI, F DELACRUZ, B CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEBOECK, H DEGRE, D DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M VANDIERENDONCK, D DILODOVICO, F DIONISI, C DITTMAR, M DOMINGUEZ, A DORIA, A DORNE, I DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I DUTTA, S EASO, S EFREMENKO, Y ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC ERNENWEIN, JP EXTERMANN, P FABBRETTI, R FABRE, M FACCINI, R FALCIANO, S FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K GAILLOUD, M GALAKTIONOV, Y GANGULI, SN GARCIAABIA, P GAU, SS GENTILE, S GERALD, J GHEORDANESCU, N GIAGU, S GOLDFARB, S GOLDSTEIN, J GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, MW GU, C GUANZIROLI, M GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HARTMANN, B HASAN, A HE, JT HEBBEKER, T HERVE, A HILGERS, K VANHOEK, WC HOFER, H HOORANI, H HOU, SR HU, G ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW DEJONG, P JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, D KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRKBY, J KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRENZ, W KUIJTEN, H KUNIN, A DEGUEVARA, PL LANDI, G LAPOINT, C LASSILAPERINI, K LAURIKAINEN, P LEBEAU, M LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, JS LEE, KY LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LIEB, E LIN, WT LINDE, FL LINDEMANN, B LISTA, L LIU, Y LIU, ZA LOHMANN, W LONGO, E LU, W LU, YS LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, WG MACCHIOLO, A MAITY, M MALGERI, L MALIK, R MALININ, A MANA, C MANGLA, S MAOLINBAY, M MARCHESINI, P MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCNALLY, D MELE, S MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A VANMIL, AJW MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MOORE, R MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S MUHEIM, F NAGY, E NAHN, S NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G OSTONEN, R PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PETRAK, S PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PISTOLESI, E PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H PRODUIT, N QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M 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TSIPOLITIS, G TULLY, C TUCHSCHERER, H ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOLKERT, R VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, XL WANG, YF WANG, ZM WEBER, A WEILL, R WILLMOTT, C WITTGENSTEIN, F WU, SX WYNHOFF, S XU, J XU, ZZ YANG, BZ YANG, CG YANG, G YAO, XY YE, CH YE, JB YE, Q YEH, SC YOU, JM YUNUS, N ZACCARDELLI, C ZALITE, A ZEMP, P ZENG, JY ZENG, M ZENG, Y ZHANG, Z ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHOU, Y ZHU, GY ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALPAT, B ALCARAZ, J ALLABY, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDREEV, VP ANGELESCU, T ANTREASYAN, D AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BARILLERE, R BARONE, L BARTALINI, P BASCHIROTTO, A BASILE, M BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F 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 BOUCHAM, A BOURILKOV, D BOURQUIN, M BOUTIGNY, D BRACCINI, S BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BUIJS, A BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M ROMEO, GC CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLINI, G CASTELLO, R CAVALLARI, F CAVALLO, N CECCHI, C CERRADA, M CESARONI, F CHAMIZO, M CHAN, A CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CIFARELLI, L CINDOLO, F CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLIJN, AP COLINO, N COMMICHAU, V COSTANTINI, S COTOROBAI, F DELACRUZ, B CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEBOECK, H DEGRE, D DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M VANDIERENDONCK, D DILODOVICO, F DIONISI, C DITTMAR, M DOMINGUEZ, A 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KIRKBY, D KIRKBY, J KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRENZ, W KUIJTEN, H KUNIN, A DEGUEVARA, PL LANDI, G LAPOINT, C LASSILAPERINI, K LAURIKAINEN, P LEBEAU, M LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, JS LEE, KY LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LIEB, E LIN, WT LINDE, FL LINDEMANN, B LISTA, L LIU, Y LIU, ZA LOHMANN, W LONGO, E LU, W LU, YS LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, WG MACCHIOLO, A MAITY, M MALGERI, L MALIK, R MALININ, A MANA, C MANGLA, S MAOLINBAY, M MARCHESINI, P MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCNALLY, D MELE, S MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A VANMIL, AJW MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MOORE, R MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S MUHEIM, F NAGY, E NAHN, S NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G OSTONEN, R PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PETRAK, S PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PISTOLESI, E PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H PRODUIT, N QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S ROBOHM, A RODIN, J RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSSELET, P VANROSSUM, W ROTH, S RUBIO, JA RYKACZEWSKI, H SALICIO, J SALICIO, JM SANCHEZ, E SANTOCCHIA, A SARAKINOS, ME SARKAR, S SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOENEICH, B SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEVCHENKO, S SHIVAROV, N SHOUTKO, V SHUKLA, J SHUMILOV, E SON, D SOPCZAK, A SOULIMOV, V SMITH, B SPICKERMANN, T SPILLANTINI, P STEUER, M STICKLAND, DP STICOZZI, F STONE, H STOYANOV, B STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD TANG, XW TAUSCHER, L TAYLOR, L TIMELLINI, R TING, SCC TING, SM TOKER, O TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUCHSCHERER, H ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOLKERT, R VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, XL WANG, YF WANG, ZM WEBER, A WEILL, R WILLMOTT, C WITTGENSTEIN, F WU, SX WYNHOFF, S XU, J XU, ZZ YANG, BZ YANG, CG YANG, G YAO, XY YE, CH YE, JB YE, Q YEH, SC YOU, JM YUNUS, N ZACCARDELLI, C ZALITE, A ZEMP, P ZENG, JY ZENG, M ZENG, Y ZHANG, Z ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHOU, Y ZHU, GY ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI STUDY OF THE KS(0)KS(0) FINAL-STATE IN 2-PHOTON COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID L3 EXPERIMENT; TRIGGER; LEP AB The reaction e(+)e(-) --> e(+)e(-)gamma*gamma* --> e(+)e(-)K(S)(0)K(S)(0) is studied with the L3 detector at LEP and the formation of the f(2)'(1525) resonance is observed, For an integrated luminosity of 114 pb(-1), 31+/-6 f(2)' events are found, Their angular distribution is consistent with a pure helicity two, The radiative width times the branching ratio is measured to be Gamma(gamma gamma)(f(2)')xBr(f(2)'--> K (K) over bar)=(0.093+/-0.018+/-0.022) keV. Only three events are found in the f(2)(1270)-a(2)(1320) mass region, consistent with destructive f(2)-a(2) interference in the (KSKS0)-K-0 final state. The mixing angle of the tensor meson nonet is determined to be theta=(29.4(-1.6)(+1.4))(0). C1 RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY. UNIV AMSTERDAM, 1009 DB AMSTERDAM, NETHERLANDS. NIKHEF, NATL INST HIGH ENERGY PHYS, AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. CNRS, LAB ANNECY LE VIEUX PHYS PARTICULES, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV BASEL, INST PHYS, CH-4056 BASEL, SWITZERLAND. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY. IST NAZL FIS NUCL, SEZIONE BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHWESTERN UNIV, BOSTON, MA 02115 USA. UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA. INST ATOM PHYS, BUCHAREST, ROMANIA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. IST NAZL FIS NUCL, SEZIONE FIRENZE, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. SEFT, HIGH ENERGY PHYS RES INST, SF-00014 HELSINKI, FINLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNR, IN2P3, F-69622 VILLEURBANNE, FRANCE. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA. UNIV NAPLES, I-80125 NAPLES, ITALY. IST NAZL FIS NUCL, NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. IST NAZL FIS NUCL, SEZIONE PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. IST NAZL FIS NUCL, SEZIONE ROMA, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. INST PHYS NUCL, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. BULGARIAN ACAD SCI, CENT LAB MECHATRON & INTRUMENTAT, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. UNIV UTRECHT, 3584 CB UTRECHT, NETHERLANDS. NIKHEF, 3584 CB UTRECHT, NETHERLANDS. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, D-15738 ZEUTHEN, GERMANY. ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY. RP ACCIARRI, M (reprint author), IST NAZL FIS NUCL, SEZIONE MILANO, I-20133 MILAN, ITALY. 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; Sanchez, Eusebio/H-5228-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Roth, Stefan/J-2757-2016; alpat, ali behcet/G-6290-2013; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; Fiandrini, Emanuele/C-4549-2008; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012 OI van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; alpat, ali behcet/0000-0002-0116-1506; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Ludovici, Lucio/0000-0003-1970-9960; Kirkby, Jasper/0000-0003-2341-9069; Servoli, Leonello/0000-0003-1725-9185 NR 26 TC 20 Z9 20 U1 2 U2 8 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. 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B PD NOV 16 PY 1995 VL 363 IS 1-2 BP 118 EP 126 DI 10.1016/0370-2693(95)01041-N PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TE608 UT WOS:A1995TE60800021 ER PT J AU ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALPAT, B ALCARAZ, J ALLABY, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G ANDERHUB, H ANDREEV, VP ANGELESCU, T ANTREASYAN, D AREFIEV, A AZEMOON, T AZIZ, T BAGNAIA, P BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BARILLERE, R BARONE, L BARTALINI, P BASCHIROTTO, A BASILE, M BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F 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 BOUCHAM, A BOURILKOV, D BOURQUIN, M BOUTIGNY, D BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BUIJS, A BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M ROMEO, GC CARIA, M CARLINO, G CARTACCI, 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LOHMANN, W LONGO, E LU, W LU, YS LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, WG MACCHIOLO, A MAITY, M MALGERI, L MALININ, A MANA, C MANGLA, S MAOLINBAY, M MARCHESINI, P MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCNALLY, D MELE, S MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A VANMIL, AJW MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MOORE, R MORAND, R MORGANTI, S MOUNT, R MULLER, S MUHEIM, F NAGY, E NAHN, S NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIPPE, A NOWAK, H ORGANTINI, G OSTONEN, R PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PETRAK, S PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PISTOLESI, E PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H PRODUIT, N RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RO, S ROBOHM, A RODIN, J RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSSELET, P VANROSSUM, W ROTH, S RUBIO, JA RYKACZEWSKI, H SALICIO, J SALICIO, JM SANCHEZ, E SANTOCCHIA, A SARAKINOS, ME SARKAR, S SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOENEICH, B SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SEILER, PG SENS, JC SERVOLI, L SHEVCHENKO, S SHIVAROV, N SHOUTKO, V SHUKLA, J SHUMILOV, E SON, D SOPCZAK, A SOULIMOV, V SMITH, B SPICKERMANN, T SPILLANTINI, P STEUER, M STICKLAND, DP STICOZZI, F STONE, H STOYANOV, B STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD TANG, XW TAUSCHER, L TAYLOR, L TING, SCC TING, SM TOKER, O TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUCHSCHERER, H ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIVARGENT, M VOLKERT, R VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, XL WANG, YF WANG, ZM WEBER, A WEILL, R WILLMOTT, C WITTGENSTEIN, F WU, SX WYNHOFF, S XU, J XU, ZZ YANG, BZ YANG, CG YAO, XY YE, JB YEH, SC YOU, JM ZACCARDELLI, C ZALITE, A ZEMP, P ZENG, JY ZENG, Y ZHANG, Z ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHOU, Y ZHU, GY ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALPAT, B ALCARAZ, J ALLABY, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G ANDERHUB, H ANDREEV, VP ANGELESCU, T ANTREASYAN, D AREFIEV, A AZEMOON, T AZIZ, T BAGNAIA, P BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BARILLERE, R BARONE, L BARTALINI, P BASCHIROTTO, A BASILE, M BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F 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 BOUCHAM, A BOURILKOV, D BOURQUIN, M BOUTIGNY, D BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BUIJS, A BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M ROMEO, GC CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLINI, G CASTELLO, R CAVALLARI, F CAVALLO, N CECCHI, C CERRADA, M CESARONI, F CHAMIZO, M CHAN, A CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CIFARELLI, L CINDOLO, F CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLIJN, AP COLINO, N COMMICHAU, V CONSTANTINI, S COTOROBAI, F DELACRUZ, B DAI, TS DALESSANDRO, R DEASMUNDIS, R DEBOECK, H DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M VANDIERENDONCK, D DILODOVICO, F DIONISI, C DITTMAR, M DOMINGUEZ, A DORIA, A DORNE, I DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I DUTTA, S EASO, S EFREMENKO, Y ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC ERNENWEIN, JP EXTERMANN, P FABBRETTI, R FABRE, M FACCINI, R FALCIANO, S FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K GAILLOUD, M GALAKTIONOV, Y GANGULI, SN GARCIAABIA, P GAU, SS GENTILE, S GERALD, J GHEORDANESCU, N GIAGU, S GOLDFARB, S GOLDSTEIN, J GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, MW GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HARTMANN, B HASAN, A HE, JT HEBBEKER, T HERVE, A HILGERS, K VANHOEK, WC HOFER, H HOORANI, H HOU, SR HU, G ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW DEJONG, P JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KIENZLEFOCACCI, MN KIM, D KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRKBY, J KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRENZ, W KUIJTEN, H KUNIN, A DEGUEVARA, PL LANDI, G LAPOINT, C LASSILAPERINI, K LAURIKAINEN, P LEBEAU, M LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, JS LEE, KY LEGGETT, C LEGOFF, JM LEISTE, R LEVTCHENKO, P LI, C LIEB, E LIN, WT LINDE, FL LENTI, M LEONARDI, E LINDEMANN, B LISTA, L LIU, ZA LOHMANN, W LONGO, E LU, W LU, YS LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, WG MACCHIOLO, A MAITY, M MALGERI, L MALININ, A MANA, C MANGLA, S MAOLINBAY, M MARCHESINI, P MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCNALLY, D MELE, S MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A VANMIL, AJW MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MOORE, R MORAND, R MORGANTI, S MOUNT, R MULLER, S MUHEIM, F NAGY, E NAHN, S NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIPPE, A NOWAK, H ORGANTINI, G OSTONEN, R PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PETRAK, S PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PISTOLESI, E PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H PRODUIT, N RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RO, S ROBOHM, A RODIN, J RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSSELET, P VANROSSUM, W ROTH, S RUBIO, JA RYKACZEWSKI, H SALICIO, J SALICIO, JM SANCHEZ, E SANTOCCHIA, A SARAKINOS, ME SARKAR, S SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOENEICH, B SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SEILER, PG SENS, JC SERVOLI, L SHEVCHENKO, S SHIVAROV, N SHOUTKO, V SHUKLA, J SHUMILOV, E SON, D SOPCZAK, A SOULIMOV, V SMITH, B SPICKERMANN, T SPILLANTINI, P STEUER, M STICKLAND, DP STICOZZI, F STONE, H STOYANOV, B STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD TANG, XW TAUSCHER, L TAYLOR, L TING, SCC TING, SM TOKER, O TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUCHSCHERER, H ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIVARGENT, M VOLKERT, R VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, XL WANG, YF WANG, ZM WEBER, A WEILL, R WILLMOTT, C WITTGENSTEIN, F WU, SX WYNHOFF, S XU, J XU, ZZ YANG, BZ YANG, CG YAO, XY YE, JB YEH, SC YOU, JM ZACCARDELLI, C ZALITE, A ZEMP, P ZENG, JY ZENG, Y ZHANG, Z ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHOU, Y ZHU, GY ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI SEARCH FOR NEUTRAL CHARMLESS B-DECAYS AT LEP SO PHYSICS LETTERS B LA English DT Article ID L3 EXPERIMENT; CP-VIOLATION; MESONS AB A search for rare charmless decays of B-d(0) and B-s(0) mesons has been performed in the exclusive channels B-d(s)(0)-->eta eta, B-d(s)(0)-->eta pi(0) and B-d(s)(0)-->pi(0) pi(0). The data sample consisted of three million hadronic Z decays collected by the L3 experiment at LEP from 1991 through 1994. No candidate event has been observed and the following upper limits at 90% confidence level on the branching ratios have been set: Br(B-d(0)--eta eta) < 4.1 x 10(-4), Br(B-s(0)-->eta eta) < 1.5 x 10(-3), Br(B-d(0)-->eta pi(0)) < 2.5 x 10(-4), Br(B-s(0)-->eta pi(0)) < 1.0 x 10(-3), Br(B-d(0)-->pi(0) pi(0)) < 6.0 x 10(-5), Br(B-s(0)-->pi(0) pi(0)) < 2.1 x 10(-4). These are the first experimental limits on B-d(0)-->eta eta and on the B-s(0) neutral charmless modes. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV AMSTERDAM, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. CNRS, LAB ANNECY LE VIEUX PHYS PARTICULES, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV BASEL, INST PHYS, CH-4056 BASEL, SWITZERLAND. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY. IST NAZL FIS NUCL, SEZIONE BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHWESTERN UNIV, BOSTON, MA 02115 USA. INST ATOM PHYS, BUCHAREST, ROMANIA. UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. IST NAZL FIS NUCL, SEZIONE FIRENZE, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. SEFT, HIGH ENERGY PHYS RES INST, SF-00014 HELSINKI, FINLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA. UNIV NAPLES, I-80125 NAPLES, ITALY. IST NAZL FIS NUCL, SEZIONE NAPOLI, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. IST NAZL FIS NUCL, SEZIONE PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. IST NAZL FIS NUCL, SEZIONE ROMA, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. INST PHYS NUCL, ST PETERSBURG, RUSSIA. UNIV SALERNO, I-84100 SALERNO, ITALY. IST NAZL FIS NUCL, I-84100 SALERNO, ITALY. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. BULGARIAN ACAD SCI, CENT LAB MECHATRON & INTRUMENTAT, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. UNIV UTRECHT, 3584 CB UTRECHT, NETHERLANDS. NIKHEF, 3584 CB UTRECHT, NETHERLANDS. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, D-15738 ZEUTHEN, GERMANY. ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY. RP ACCIARRI, M (reprint author), IST NAZL FIS NUCL, SEZIONE MILANO, I-20133 MILAN, ITALY. RI Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Sanchez, Eusebio/H-5228-2015; 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; Vogel, Helmut/N-8882-2014; Fiandrini, Emanuele/C-4549-2008; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012; alpat, ali behcet/G-6290-2013; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012; Cerrada, Marcos/J-6934-2014; Josa, Isabel/K-5184-2014; Gonzalez Romero, Enrique/L-7561-2014; OI Ambrosi, Giovanni/0000-0001-6977-9559; Castellini, Guido/0000-0002-0177-0643; Diemoz, Marcella/0000-0002-3810-8530; Faccini, Riccardo/0000-0003-2613-5141; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Vogel, Helmut/0000-0002-6109-3023; Ludovici, Lucio/0000-0003-1970-9960; Kirkby, Jasper/0000-0003-2341-9069; Servoli, Leonello/0000-0003-1725-9185; alpat, ali behcet/0000-0002-0116-1506; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Goldstein, Joel/0000-0003-1591-6014 NR 34 TC 18 Z9 18 U1 1 U2 5 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 NOV 16 PY 1995 VL 363 IS 1-2 BP 127 EP 136 DI 10.1016/0370-2693(95)01042-O PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TE608 UT WOS:A1995TE60800022 ER PT J AU ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALPAT, B ALCARAZ, J ALLABY, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G ANDERHUB, H ANDREEV, VP ANGELESCU, T ANTREASYAN, D AREFIEV, A AZEMOON, T AZIZ, T BAGNAIA, P BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BARILLERE, R BARONE, L BARTALINI, P BASCHIROTTO, A BASILE, M BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F 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 BOUCHAM, A BOURILKOV, D BOURQUIN, M BOUTIGNY, D BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BUIJS, A BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M ROMEO, GC CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLINI, G CASTELLO, R CAVALLARI, F CAVALLO, N CECCHI, C CERRADA, M CESARONI, F CHAMIZO, M CHAN, A CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CIFARELLI, L CINDOLO, F CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLIJN, AP COLINO, N COMMICHAU, V COSTANTINI, S COTOROBAI, F DELACRUZ, B DAI, TS DALESSANDRO, R DEASMUNDIS, R DEBOECK, H DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M VANDIERENDONCK, D DILODOVICO, F DIONISI, C DITTMAR, M DOMINGUEZ, A DORIA, A DORNE, I DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I DUTTA, S EASO, S EFREMENKO, Y ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC ERNENWEIN, JP EXTERMANN, P FABBRETTI, R FABRE, M FACCINI, R FALCIANO, S FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K GAILLOUD, M GALAKTIONOV, Y GANGULI, SN GARCIAABIA, P GAU, SS GENTILE, S GERALD, J GHEORDANESCU, N GIAGU, S GOLDFARB, S GOLDSTEIN, J GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, MW GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HARTMANN, B HASAN, A HE, JT HEBBEKER, T HERVE, A HILGERS, K VANHOEK, WC HOFER, H HOORANI, H HOU, SR HU, G ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW DEJONG, P JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KIENZLEFOCACCI, MN KIM, D KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRKBY, J KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRENZ, W KUIJTEN, H KUNIN, A DEGUEVARA, PL LANDI, G LAPOINT, C LASSILAPERINI, K LAURIKAINEN, P LEBEAU, M LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, JS LEE, KY LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LIEB, E LIN, WT LINDE, FL LINDEMANN, B LISTA, L LIU, ZA LOHMANN, W LONGO, E LU, W LU, YS LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, WG MACCHIOLO, A MAITY, M MALGERI, L MALININ, A MANA, C MANGLA, S MAOLINBAY, M MARCHESINI, P MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCNALLY, D MELE, S MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A VANMIL, AJW MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MOORE, R MORAND, R MORGANTI, S MOUNT, R MULLER, S MUHEIM, F NAGY, E NAHN, S NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIPPE, A NOWAK, H ORGANTINI, G OSTONEN, R PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PETRAK, S PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PISTOLESI, E PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H PRODUIT, N RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RO, S ROBOHM, A RODIN, J RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSSELET, P VANROSSUM, W ROTH, S RUBIO, JA RYKACZEWSKI, H SALICIO, J SALICIO, JM SANCHEZ, E SANTOCCHIA, A SARAKINOS, ME SARKAR, S SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOENEICH, B SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SEILER, PG SENS, JC SERVOLI, L SHEVCHENKO, S SHIVAROV, N SHOUTKO, V SHUKLA, J SHUMILOV, E SON, D SOPCZAK, A SOULIMOV, V SMITH, B SPICKERMANN, T SPILLANTINI, P STEUER, M STICKLAND, DP STICOZZI, F STONE, H STOYANOV, B STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD TANG, XW TAUSCHER, L TAYLOR, L TING, SCC TING, SM TOKER, O TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUCHSCHERER, H ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIVARGENT, M VOLKERT, R VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, XL WANG, YF WANG, ZM WEBER, A WEILL, R WILLMOTT, C WITTGENSTEIN, F WU, SX WYNHOFF, S XU, J XU, ZZ YANG, BZ YANG, CG YAO, XY YE, JB YEH, SC YOU, JM ZACCARDELLI, C ZALITE, A ZEMP, P ZENG, JY ZENG, Y ZHANG, Z ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHOU, Y ZHU, GY ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALPAT, B ALCARAZ, J ALLABY, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G ANDERHUB, H ANDREEV, VP ANGELESCU, T ANTREASYAN, D AREFIEV, A AZEMOON, T AZIZ, T BAGNAIA, P BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BARILLERE, R BARONE, L BARTALINI, P BASCHIROTTO, A BASILE, M BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F 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 BOUCHAM, A BOURILKOV, D BOURQUIN, M BOUTIGNY, D BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BUIJS, A BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M ROMEO, GC CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLINI, G CASTELLO, R CAVALLARI, F CAVALLO, N CECCHI, C CERRADA, M CESARONI, F CHAMIZO, M CHAN, A CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CIFARELLI, L CINDOLO, F CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLIJN, AP COLINO, N COMMICHAU, V COSTANTINI, S COTOROBAI, F DELACRUZ, B DAI, TS DALESSANDRO, R DEASMUNDIS, R DEBOECK, H DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M VANDIERENDONCK, D DILODOVICO, F DIONISI, C DITTMAR, M DOMINGUEZ, A DORIA, A DORNE, I DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I DUTTA, S EASO, S EFREMENKO, Y ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC ERNENWEIN, JP EXTERMANN, P FABBRETTI, R FABRE, M FACCINI, R FALCIANO, S FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K GAILLOUD, M GALAKTIONOV, Y GANGULI, SN GARCIAABIA, P GAU, SS GENTILE, S GERALD, J GHEORDANESCU, N GIAGU, S GOLDFARB, S GOLDSTEIN, J GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, MW GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HARTMANN, B HASAN, A HE, JT HEBBEKER, T HERVE, A HILGERS, K VANHOEK, WC HOFER, H HOORANI, H HOU, SR HU, G ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW DEJONG, P JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KIENZLEFOCACCI, MN KIM, D KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRKBY, J KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRENZ, W KUIJTEN, H KUNIN, A DEGUEVARA, PL LANDI, G LAPOINT, C LASSILAPERINI, K LAURIKAINEN, P LEBEAU, M LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, JS LEE, KY LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LIEB, E LIN, WT LINDE, FL LINDEMANN, B LISTA, L LIU, ZA LOHMANN, W LONGO, E LU, W LU, YS LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, WG MACCHIOLO, A MAITY, M MALGERI, L MALININ, A MANA, C MANGLA, S MAOLINBAY, M MARCHESINI, P MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCNALLY, D MELE, S MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A VANMIL, AJW MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MOORE, R MORAND, R MORGANTI, S MOUNT, R MULLER, S MUHEIM, F NAGY, E NAHN, S NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIPPE, A NOWAK, H ORGANTINI, G OSTONEN, R PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PETRAK, S PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PISTOLESI, E PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H PRODUIT, N RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RO, S ROBOHM, A RODIN, J RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSSELET, P VANROSSUM, W ROTH, S RUBIO, JA RYKACZEWSKI, H SALICIO, J SALICIO, JM SANCHEZ, E SANTOCCHIA, A SARAKINOS, ME SARKAR, S SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOENEICH, B SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SEILER, PG SENS, JC SERVOLI, L SHEVCHENKO, S SHIVAROV, N SHOUTKO, V SHUKLA, J SHUMILOV, E SON, D SOPCZAK, A SOULIMOV, V SMITH, B SPICKERMANN, T SPILLANTINI, P STEUER, M STICKLAND, DP STICOZZI, F STONE, H STOYANOV, B STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD TANG, XW TAUSCHER, L TAYLOR, L TING, SCC TING, SM TOKER, O TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUCHSCHERER, H ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIVARGENT, M VOLKERT, R VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, XL WANG, YF WANG, ZM WEBER, A WEILL, R WILLMOTT, C WITTGENSTEIN, F WU, SX WYNHOFF, S XU, J XU, ZZ YANG, BZ YANG, CG YAO, XY YE, JB YEH, SC YOU, JM ZACCARDELLI, C ZALITE, A ZEMP, P ZENG, JY ZENG, Y ZHANG, Z ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHOU, Y ZHU, GY ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI SEARCH FOR THE DECAYS B-D(0)-]GAMMA-GAMMA AND B-S(0)-]GAMMA-GAMMA SO PHYSICS LETTERS B LA English DT Article ID L3 EXPERIMENT; TOP-QUARK AB A search for the decays B-d,s(0) --> gamma gamma in 2.95 million hadronic Z decays has been performed using the L3 detector at LEP. No candidates are found in the signal region and upper limits have been set on the branching ratios: Br(B-d(0) --> gamma gamma) < 3.9 x 10(-5) and Br(B-s(0) --> gamma gamma) < 14.8 x 10(-5) at 90% CL. These are the first limits set on these exclusive rare decays. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV AMSTERDAM, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. LAB ANNECY LE VIEUX PHYS PARTICULES, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV BASEL, INST PHYS, CH-4056 BASEL, SWITZERLAND. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY. IST NAZL FIS NUCL, SEZIONE BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHWESTERN UNIV, BOSTON, MA 02115 USA. INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA. UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV FLORENCE, I-50125 FLORENCE, ITALY. IST NAZL FIS NUCL, SEZIONE FIRENZE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. SEFT, HIGH ENERGY PHYS RES INST, SF-00014 HELSINKI, FINLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA. UNIV NAPLES, I-80125 NAPLES, ITALY. IST NAZL FIS NUCL, SEZIONE NAPOLI, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. IST NAZL FIS NUCL, SEZIONE PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. IST NAZL FIS NUCL, SEZIONE ROMA, I-00185 ROME, ITALY. INST PHYS NUCL, ST PETERSBURG, RUSSIA. UNIV SALERNO, I-84100 SALERNO, ITALY. IST NAZL FIS NUCL, I-84100 SALERNO, ITALY. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. BULGARIAN ACAD SCI, CENT LAB MECHATRON & INSTRUMENTAT, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. UNIV UTRECHT, 3584 CB UTRECHT, NETHERLANDS. NIKHEF, 3584 CB UTRECHT, NETHERLANDS. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, D-15738 ZEUTHEN, GERMANY. ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. RP ACCIARRI, M (reprint author), IST NAZL FIS NUCL, SEZIONE MILANO, I-20133 MILAN, ITALY. RI Ferguson, Thomas/O-3444-2014; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Sanchez, Eusebio/H-5228-2015; 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; Vogel, Helmut/N-8882-2014; Fiandrini, Emanuele/C-4549-2008; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012; alpat, ali behcet/G-6290-2013; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012; Cerrada, Marcos/J-6934-2014; de la Cruz, Begona/K-7552-2014; Josa, Isabel/K-5184-2014; Gonzalez Romero, Enrique/L-7561-2014 OI Castellini, Guido/0000-0002-0177-0643; Diemoz, Marcella/0000-0002-3810-8530; Faccini, Riccardo/0000-0003-2613-5141; Filthaut, Frank/0000-0003-3338-2247; Goldstein, Joel/0000-0003-1591-6014; Ferguson, Thomas/0000-0001-5822-3731; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Vogel, Helmut/0000-0002-6109-3023; Ludovici, Lucio/0000-0003-1970-9960; Kirkby, Jasper/0000-0003-2341-9069; Servoli, Leonello/0000-0003-1725-9185; alpat, ali behcet/0000-0002-0116-1506; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920 NR 17 TC 11 Z9 11 U1 1 U2 6 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 NOV 16 PY 1995 VL 363 IS 1-2 BP 137 EP 144 DI 10.1016/0370-2693(95)01224-E PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TE608 UT WOS:A1995TE60800023 ER PT J AU VAIDYA, B ZAK, J BASTIAANS, GJ PORTER, MD HALLMAN, JL NABULSI, NAR UTTERBACK, MD STRZELBICKA, B BARTSCH, RA AF VAIDYA, B ZAK, J BASTIAANS, GJ PORTER, MD HALLMAN, JL NABULSI, NAR UTTERBACK, MD STRZELBICKA, B BARTSCH, RA TI CHROMOGENIC AND FLUOROGENIC GROWN ETHER COMPOUNDS FOR THE SELECTIVE EXTRACTION AND DETERMINATION OF HG(II) SO ANALYTICAL CHEMISTRY LA English DT Article ID EARTH METAL-IONS; LIQUID-LIQUID-EXTRACTION; CROWN ETHERS; FLUORIMETRIC DETERMINATION; PHOTOMETRIC REAGENTS; CYCLIC POLYETHER; PAIR EXTRACTION; ALKALI; POTASSIUM; DIBENZO-18-CROWN-6 AB Two novel crown ether compounds, N,N'-bis(2-hydroxy-5-nitrobenzyl)-4,13-diazadibenzo-18-crown-6 (CCE) and N,N'-bis(7-hydroxy-4-methylcoumarin-8-methylene)-4,13-diazadibenzo-18-crown-6 (FCE), have been synthesized as potential reagents for the selective extraction and determination of heavy metal ions, Characterizations of the acid-base reactivity and the heavy metal ion extraction capabilities are reported, Both CCE and FCE undergo four-step ionization processes with associated tautomeric transformations and form stable complexes with divalent metal cations that can be extracted into 1,2-dichloroethane, Extraction constants for Ba(II), Ca(II), Cd(II), Cu(II), Hg(II), Pb(II), and Sr(II) have been determined for both reagents, For CCE, the extraction order is Hg(II) much greater than Pb(II) > Cu(II) > Cd(II) > Ca(II) > Sr(II) > Ba(II), whereas the order for FCE is Hg(II) much greater than Cu(II) > Pb(II) > Cd(II) > Ca(II) > Sr(II) > Ba(II), The selectivity of CCE for Hg(II) over the next-best-extracted cation, Pb(II), is similar to 2 x 10(7) and that of FCE for Hg(II) over next-best-extracted cation, Cu(II), is similar to 5 x 10(6), Potential applications to chemical analysis, based on the unprecedented selectivity of both reagents for Hg(II), are briefly examined. C1 US DOE,AMES LAB,CTR MICROANALYT INSTRUMENTAT,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. TEXAS TECH UNIV,DEPT CHEM & BIOCHEM,LUBBOCK,TX 79409. NR 52 TC 42 Z9 44 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1995 VL 67 IS 22 BP 4101 EP 4111 DI 10.1021/ac00118a012 PG 11 WC Chemistry, Analytical SC Chemistry GA TD958 UT WOS:A1995TD95800012 ER PT J AU GOERINGER, DE CRUTCHER, RI MCLUCKEY, SA AF GOERINGER, DE CRUTCHER, RI MCLUCKEY, SA TI ION REMEASUREMENT IN THE RADIO-FREQUENCY QUADRUPOLE ION-TRAP SO ANALYTICAL CHEMISTRY LA English DT Article ID RESONANCE MASS-SPECTROMETRY; EXCITATION; EJECTION; SIGNAL AB Multiple remeasurement of the same population of stored ions in a radio frequency (rf) quadrupole ion trap is demonstrated, As the secular frequency of stored ions is swept across a fixed-frequency resonance excitation signal via amplitude modulation of the confining rf voltage, the image current generated by the resulting coherent ion motion is measured simultaneously with tuned-circuit, phase-sensitive defection, Judicious selection of the resonance excitation frequency and rf voltage ramp limits enables the excitation-detection process to be performed over a range of mass-to-charge values, Furthermore, the inherent focusing of the quadrupole held and use of helium buffer gas (similar to 10(-4) Torr) enable repeated scans to be made with negligible ion loss, For a collection of C3F5+ ions (m/z 131) produced via a single electron ionization event, the remeasurement efficiency during 24 scans, as judged by the scan-to-scan loss in signal, was >99%. C1 OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831. RP GOERINGER, DE (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 33 TC 27 Z9 28 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1995 VL 67 IS 22 BP 4164 EP 4169 DI 10.1021/ac00118a020 PG 6 WC Chemistry, Analytical SC Chemistry GA TD958 UT WOS:A1995TD95800020 ER PT J AU MOORE, AW JACOBSON, SC RAMSEY, JM AF MOORE, AW JACOBSON, SC RAMSEY, JM TI MICROCHIP SEPARATIONS OF NEUTRAL SPECIES VIA MICELLAR ELECTROKINETIC CAPILLARY CHROMATOGRAPHY SO ANALYTICAL CHEMISTRY LA English DT Article ID SAMPLE INJECTION; ELECTROPHORESIS; EFFICIENCY AB Micellar electrokinetic capillary chromatography (MECC) of three neutral coumarin dyes was performed on glass microchips. Manifolds of channels for analyte injection and separation were machined into one surface of the mass substrates using standard photolithographic, etching, and deposition techniques. Coverplates were then directly bonded over these channels to form capillary networks, with fluid flow in these networks controlled by varying the applied high-voltage potentials at the outlets. The separation capillary was 16.5 cm long for a serpentine channel chip and 1.3 cm long for a straight channel chip. Detection of analyte zones was accomplished by laser-induced fluorescence using the UV lines (similar to 350 nm) of an argon ion laser. At low applied electric field strengths, MECC analyses with on-chip injections gave high reproducibilities in peak areas and migration times (<1% for two of the three coumarins) and near constant separation efficiencies throughout the analysis. At high fields (>400 V/cm), analysis times were shorter, but separation efficiency decreased at later migration times. These peaks showed significant broadening, consistent with mass transfer effects. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 12 TC 122 Z9 124 U1 0 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1995 VL 67 IS 22 BP 4184 EP 4189 DI 10.1021/ac00118a023 PG 6 WC Chemistry, Analytical SC Chemistry GA TD958 UT WOS:A1995TD95800023 ER PT J AU Helgesson, J Randrup, J AF Helgesson, J Randrup, J TI Spin-isospin modes in heavy-ion collisions .1. Nuclear matter at finite temperatures SO ANNALS OF PHYSICS LA English DT Article ID THOMAS-FERMI MODEL; ELASTIC-SCATTERING; INTERMEDIATE ENERGY; DILEPTON PRODUCTION; UNIFIED ANALYSIS; TRANSPORT MODEL; PIONIC MODES; HOLE MODEL; DELTA; EXCITATIONS AB With a view toward implementation in microscopic transport simulations of heavy-ion collisions, the properties of spin-isospin modes are studied in nuclear matter consisting of nucleons and Delta isobars that interact by the exchange of pi and p mesons. For a standard p-wave interaction and an effective g' short-range interaction, the dispersion relations for the spin-isospin modes, and the associated amplitudes, are calculated at various nuclear densities and temperatures within the random-phase approximation. Quantities of physical interest are then extracted, including the total and partial Delta decay widths and the Delta cross sections in the nuclear medium. The self-consistent inclusion of the Delta width has a strong effect on the Delta cross sections at twice the normal nuclear density, as compared with the result of ignoring the width. Generally, the obtained quantities exhibit a strong density dependence, but are Fairly insensitive to the temperature, at least up to T=25 MeV. Finally, it is described how these in-medium effects may be consistently included in microscopic transport simulations of nuclear collisions, and the improvements over previous approaches are discussed. (C) 1995 Academic Press. Inc. RP Helgesson, J (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV NUCL SCI, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 43 TC 19 Z9 19 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD NOV 15 PY 1995 VL 244 IS 1 BP 12 EP 66 DI 10.1006/aphy.1995.1106 PG 55 WC Physics, Multidisciplinary SC Physics GA TN038 UT WOS:A1995TN03800002 ER PT J AU Fabry, ME Suzuka, SM Rubin, E Paszty, C Costantini, F Nagel, RL AF Fabry, ME Suzuka, SM Rubin, E Paszty, C Costantini, F Nagel, RL TI Mouse alpha knockout increases expression of HbS in the sickle transgenic mouse. SO BLOOD LA English DT Meeting Abstract C1 ALBERT EINSTEIN COLL MED,DIV HEMATOL,BRONX,NY 10467. MONTEFIORE MED CTR,BRONX,NY 10467. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. COLUMBIA UNIV,DEPT GENET & DEV,NEW YORK,NY. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 7 EP 7 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91000007 ER PT J AU Yuan, J Rubin, E Paszty, C Schrier, SL AF Yuan, J Rubin, E Paszty, C Schrier, SL TI Programmederythroid cell death in the spleens of beta (beta) thalassemic mice. SO BLOOD LA English DT Meeting Abstract C1 STANFORD UNIV,DIV HEMATOL,PALO ALTO,CA 94304. LAWRENCE BERKELEY LAB,BERKELEY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 19 EP 19 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91000019 ER PT J AU Fabry, ME Suzuka, SM Rubin, E Costantini, F Nagel, RL AF Fabry, ME Suzuka, SM Rubin, E Costantini, F Nagel, RL TI Red cells produced by fetal mouse liver have a different ratio of HbS/HbS-Antilles than adult mouse RBCs. SO BLOOD LA English DT Meeting Abstract C1 ALBERT EINSTEIN COLL MED,DIV HEMATOL,BRONX,NY 10467. MONTEFIORE MED CTR,BRONX,NY 10467. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MOLEC BIOL,BERKELEY,CA 94720. COLUMBIA UNIV,DEPT GENET & DEV,NEW YORK,NY. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 538 EP 538 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91000538 ER PT J AU Popp, RA Popp, DM Yang, MY Aguinaga, MDP Kopsombut, P Turner, EA Rubin, EM AF Popp, RA Popp, DM Yang, MY Aguinaga, MDP Kopsombut, P Turner, EA Rubin, EM TI Transgenic mice that exhibit a high incidence of classical sickle cells SO BLOOD LA English DT Meeting Abstract C1 OAK RIDGE GRAD SCH BIOMED SCI,DIV BIOL,OAK RIDGE,TN. MEHARRY MED COLL,CTR COMPREHENS SICKLE CELL,NASHVILLE,TN 37208. LAWRENCE BERKELEY LAB,BERKELEY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1179 EP 1179 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001181 ER PT J AU Kaul, DK Fabry, ME Costantini, F Rubin, EM Nagel, RL AF Kaul, DK Fabry, ME Costantini, F Rubin, EM Nagel, RL TI The effect of oxygen tension and oxygen-induced in vivo unsickling of red cells on microvascular flow and vessel dynamic response in sickle transgenic mouse SO BLOOD LA English DT Meeting Abstract C1 MONTEFIORE MED CTR,ALBERT EINSTEIN COLL MED,BRONX,NY 10467. COLUMBIA UNIV,NEW YORK,NY. LAWRENCE BERKELEY LAB,BERKELEY,CA. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1185 EP 1185 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001187 ER PT J AU Bray, PF Jin, Y Rubin, E Wilhide, CC VillaGarcia, M Li, L AF Bray, PF Jin, Y Rubin, E Wilhide, CC VillaGarcia, M Li, L TI Organization of the of the 65 kilobase human beta(3) integrin (platelet GPIIIa) gene 5' regulatory region and identification on an intronic enhancer. SO BLOOD LA English DT Meeting Abstract C1 JOHNS HOPKINS UNIV,SCH MED,BALTIMORE,MD. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LABS,BERKELEY,CA 94720. CTR DESARROLLO BIOTEHNOL,MONTERREY,MEXICO. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1218 EP 1218 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001220 ER PT J AU Krauss, SW Larabell, CA Rodgers, C Mohandas, N Chasis, JA AF Krauss, SW Larabell, CA Rodgers, C Mohandas, N Chasis, JA TI Protein 4.1 in nuclear matrix and centrosomes. SO BLOOD LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1647 EP 1647 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001649 ER PT J AU Knowles, DW Tilley, L Grimm, JA Mohandas, N Chasis, JA AF Knowles, DW Tilley, L Grimm, JA Mohandas, N Chasis, JA TI Increased cytoskeletal interaction of glycophorin A and band 3 induced by glycophorin A receptor ligands SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE LIVERMORE NATL LAB,BERKELEY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1861 EP 1861 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001863 ER PT J AU Gee, SL Lersch, R Conboy, JG AF Gee, SL Lersch, R Conboy, JG TI Cis-regulatory elements in alternatively spliced protein 4.1 pre-mRNA. SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE LIVERMORE NATL LAB,DIV LIFE SCI,BERKELEY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1864 EP 1864 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001866 ER PT J AU Magowan, C Coppel, R Mohandas, N AF Magowan, C Coppel, R Mohandas, N TI Erythrocyte protein 4.1 and Plasmodium falciparum phosphoprotein MESA: Membrane-bound transport of parasite protein to the erythrocyte skeleton SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE LIVERMORE NATL LAB,BERKELEY,CA. MONASH UNIV,CLAYTON,VIC 3168,AUSTRALIA. RI Coppel, Ross/A-6626-2008 OI Coppel, Ross/0000-0002-4476-9124 NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1865 EP 1865 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001867 ER PT J AU Bookchin, RM Etzion, Z Sorette, M Mohandas, N Lew, VL AF Bookchin, RM Etzion, Z Sorette, M Mohandas, N Lew, VL TI Detection of a low-density, low-K+, high-Na+, non-reticulocyte subpopulation of sickle cell anemia (SS) and normal (AA) red cells (RBCs). SO BLOOD LA English DT Meeting Abstract C1 ALBERT EINSTEIN COLL MED,BRONX,NY 10467. BAYER INC,TARRYTOWN,NY. LAWRENCE BERKELEY LAB,BERKELEY,CA. PHYSIOL LAB,CAMBRIDGE,ENGLAND. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1880 EP 1880 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001882 ER PT J AU Browne, PV Shaley, O Choong, S Solovey, A Schrier, S Mohandas, N Hebbel, RP AF Browne, PV Shaley, O Choong, S Solovey, A Schrier, S Mohandas, N Hebbel, RP TI Amelioration of red cell pathobiology and hemolysis in murine thalassemia via deferiprone (L1)-mediated removal of red blood cell membrane iron. SO BLOOD LA English DT Meeting Abstract C1 UNIV MINNESOTA,DEPT MED,MINNEAPOLIS,MN 55455. STANFORD UNIV,DIV HEMATOL,STANFORD,CA 94305. LAWRENCE BERKELEY LAB,BERKELEY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 1917 EP 1917 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91001918 ER PT J AU Harris, JE Seed, T Dudeja, P Jejah, A Anderson, KM AF Harris, JE Seed, T Dudeja, P Jejah, A Anderson, KM TI A 5-lipoxygenase inhibitor at micromolar concentration induces apoptosis in CML blast and U937 monoblastoid cells. SO BLOOD LA English DT Meeting Abstract C1 RUSH MED COLL,DEPT MED,CHICAGO,IL 60612. RUSH MED COLL,DEPT BIOCHEM,CHICAGO,IL 60612. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT MED,CHICAGO,IL. W SIDE VA,CHICAGO,IL. COOK CTY HOSP,CHICAGO,IL 60612. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2077 EP 2077 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002077 ER PT J AU AminololamaShakeri, S Venkateswaran, KS Mariella, R Vyas, GN AF AminololamaShakeri, S Venkateswaran, KS Mariella, R Vyas, GN TI Simultaneous ABO and Rh blood typing by flow cytometry using a three color fluorescence detection SO BLOOD LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2422 EP 2422 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002423 ER PT J AU Aguinaga, MDP Kopsombut, P Koury, MJ Roa, PD Rivers, A Eason, F Turner, EA Popp, RA AF Aguinaga, MDP Kopsombut, P Koury, MJ Roa, PD Rivers, A Eason, F Turner, EA Popp, RA TI Antifolate therapy or folate deficiency influences HB S levels and in vitro sickling in sickle cell transgenic mouse. SO BLOOD LA English DT Meeting Abstract C1 VANDERBILT UNIV,MEHARRY MED COLL,CTR COMPREHENS SICKLE CELL,NASHVILLE,TN. VET ADM MED CTR,NASHVILLE,TN 37203. OAK RIDGE NATL LAB,OAK RIDGE,TN. NR 0 TC 0 Z9 0 U1 1 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2550 EP 2550 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002551 ER PT J AU Watt, SM LeeProudhoe, JE Stubbs, L Benton, MA Ward, C Hughes, J Popov, B Tchilian, E AF Watt, SM LeeProudhoe, JE Stubbs, L Benton, MA Ward, C Hughes, J Popov, B Tchilian, E TI Murine CD33: Genomic structure, regulatory elements and splice variants SO BLOOD LA English DT Meeting Abstract C1 INST MOLEC MED,MRC,MOLEC HAEMATOL UNIT,OXFORD,ENGLAND. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NATL ACAD SCI,CYTOL UNIT,ST PETERSBURG,RUSSIA. CTR CLIN RES IMMUNOL & SIGNALLING,BIRMINGHAM,W MIDLANDS,ENGLAND. NR 0 TC 0 Z9 0 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 NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2721 EP 2721 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002722 ER PT J AU DAI, S TOTH, LM DELCUL, GD METCALF, DH AF DAI, S TOTH, LM DELCUL, GD METCALF, DH TI NEAR-IR ABSORPTION TRANSITION OF H-3(4) TO F-3(2) FOR UCL62- COMPLEX IN M(2)ZRCL(6) HOST CRYSTALS (M=K+, RB+, AND CS+) - AN EXPERIMENTAL AND THEORETICAL-STUDY SO CHEMICAL PHYSICS LA English DT Article ID RESONANCE RAMAN-SCATTERING; EXCITED LUMINESCENCE SPECTRUM; VIBRONIC SPECTRA; CS2ZRBR6-UBR62; FIELDS; U-4+ AB The near-IR electronic transition from ground-state Gamma(1) of H-3(4) to the excited-state Gamma(3) of F-3(2) for the UCl62- complex in three M(2)ZrCl(6) host crystals (M = K+, Rb+, and Cs+) has been investigated experimentally and theoretically The vibration frequency of the excited state is found to be sensitive to the alkaline ion substitution and the frequency variation follows the trend predicted by the 'counterion effect'. In contrast to previous studies, the apparent anomaly in the intensity ratio of the two vibronic peaks from the prediction of a Boltzmann distribution relationship is attributed to the vibration frequency difference between the ground and the excited state. This new interpretation is supported by computer simulation of the experimental optical spectra. RP DAI, S (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831, USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 21 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD NOV 15 PY 1995 VL 200 IS 3 BP 271 EP 279 DI 10.1016/0301-0104(95)00228-6 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TF321 UT WOS:A1995TF32100001 ER PT J AU ROVIRA, MC NOVOA, JJ WHANGBO, MH WILLIAMS, JM AF ROVIRA, MC NOVOA, JJ WHANGBO, MH WILLIAMS, JM TI AB-INITIO COMPUTATION OF THE POTENTIAL-ENERGY SURFACES OF THE WATER HYDROCARBON COMPLEXES H2O-C2H2, H2O C2H4 AND H2O-CH4 - MINIMUM ENERGY STRUCTURES, VIBRATIONAL FREQUENCIES AND HYDROGEN-BOND ENERGIES SO CHEMICAL PHYSICS LA English DT Article ID C-H BONDS; SHORT INTERMOLECULAR CONTACTS; INFRARED MATRIX-ISOLATION; FUNCTION COUNTERPOISE METHOD; MOLECULAR PACKING; ABINITIO CALCULATIONS; BASIS SET; H...O; CRYSTAL; BASES AB On the basis of ab initio MP2/6-31 + + G(2d,2p) calculations, we examined the potential energy surfaces of the water hydrocarbon complexes H2O ... CH4, H2O ... C2H4 and H2O ... C2H2 to locate all the minimum energy structures and estimate the hydrogen bond energies and vibrational frequencies associated with the C(sp(n))-H ... O and the O-H ... C(sp(n)) bonds (n = 1-3). Our calculations show that H2O ... C2H2, H2O ... C2H4 and H2O ... CH4 have two minimum energy structures (i.e., the C-H ... O and O-H ... C hydrogen bond forms), but H2O ... C2H4 has only one when the vibrational motion is taken into account, the O-H ... C hydrogen bond form. We have also computed the barrier for the interconversion from one minimum to the other. The fully optimized geometries of H2O ... CH4, H2O ... C2H4 and H2O ... C2H2 as well as the vibrational shifts of the C-H stretching frequencies in their C-H ... O hydrogen-bonded forms are in good agreement with the available experimental data. The calculated hydrogen bond energies show that the C(sp(n))-H ... O bond strengths decrease in the order C(sp)-H ... O > C(sp(2))-H ... O > C(sp(3))-H ... O, which is also consistent with the available experimental data. C1 UNIV BARCELONA,DEPT QUIM FIS,E-08028 BARCELONA,SPAIN. 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. RI Novoa, Juan/B-3525-2013; Rovira, Carme/K-5195-2014 OI Novoa, Juan/0000-0003-3577-1182; Rovira, Carme/0000-0003-1477-5010 NR 69 TC 61 Z9 61 U1 2 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD NOV 15 PY 1995 VL 200 IS 3 BP 319 EP 335 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TF321 UT WOS:A1995TF32100005 ER PT J AU LAURSEN, TA MAKER, BN AF LAURSEN, TA MAKER, BN TI AN AUGMENTED LAGRANGIAN QUASI-NEWTON SOLVER FOR CONSTRAINED NONLINEAR FINITE-ELEMENT APPLICATIONS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE QUASI-NEWTON SOLVER; AUGMENTED LAGRANGIANS; NONLINEAR FINITE ELEMENTS ID CONTACT PROBLEMS; FRICTION; ALGORITHMS; EQUATIONS AB A solution scheme is presented for constrained non-linear equations of evolution that result, for example, from the finite element discretization of mechanical contact problems. The algorithm discussed utilizes a quasi-Newton non-linear equation solving strategy, with constraints enforced by an augmented Lagrangian iteration procedure. Through presentation of a simple model problem and its generalization, it is shown that the iterations associated with both the quasi-Newton algorithm and the augmentation procedure can be interwoven to produce a highly efficient and robust solution strategy. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LAURSEN, TA (reprint author), DUKE UNIV,DEPT CIVIL & ENVIRONM ENGN,BOX 90287,DURHAM,NC 27708, USA. OI Laursen, Tod/0000-0003-4704-7730 NR 30 TC 22 Z9 23 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD NOV 15 PY 1995 VL 38 IS 21 BP 3571 EP 3590 DI 10.1002/nme.1620382103 PG 20 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA TC970 UT WOS:A1995TC97000002 ER PT J AU GOVINDJEE, S KAY, GJ SIMO, JC AF GOVINDJEE, S KAY, GJ SIMO, JC TI ANISOTROPIC MODELING AND NUMERICAL-SIMULATION OF BRITTLE DAMAGE IN CONCRETE SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE BRITTLE DAMAGE; SOFTENING; ANISOTROPIC DAMAGE; CHARACTERISTIC LENGTH; CONCRETE MODELING ID STRAIN; BEHAVIOR AB A framework for damage mechanics of brittle solids is presented and exploited in the design and numerical implementation of an anisotropic model for the tensile failure of concrete. The key feature exploited in the analysis is the hypothesis of maximum dissipation, which specifies a unique damage rule for the elastic moduli of the solid once a failure surface is specified. A complete algorithmic treatment of the resulting model is given which renders a useful tool for large-scale inelastic finite element calculations. A rather simple three-surface failure model for concrete, containing essentially no adjustable parameters, is shown to produce results in remarkably good agreement with sample experimental data. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. STANFORD UNIV,DEPT MECH ENGN,DIV APPL MECH,STANFORD,CA 94305. RP GOVINDJEE, S (reprint author), UNIV CALIF BERKELEY,DEPT CIVIL ENGN,DIV STRUCT ENGN & STRUCT MECH,BERKELEY,CA 94720, USA. RI Govindjee, Sanjay/B-6886-2008 OI Govindjee, Sanjay/0000-0003-0711-3633 NR 36 TC 91 Z9 96 U1 4 U2 19 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD NOV 15 PY 1995 VL 38 IS 21 BP 3611 EP 3633 DI 10.1002/nme.1620382105 PG 23 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA TC970 UT WOS:A1995TC97000004 ER PT J AU BATY, RS MORRIS, PJ AF BATY, RS MORRIS, PJ TI THE INSTABILITY OF JETS OF ARBITRARY EXIT GEOMETRY SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article ID WAVE STRUCTURES; MIXING LAYER; SHEAR LAYERS; TURBULENT; SHAPE AB This paper describes a calculation technique to determine the linear instability characteristics of jets of arbitrary exit geometry. In particular, elliptic and rectangular jets are considered. The numerical procedure involves both a conformal transformation between the computational domain and the physical plane and a solution of the transformed stability equation in the computational domain. Modern, efficient, conformal mappings are used for both simply and doubly connected domains. The numerical solution is based on a hybrid finite difference/pseudospectral discretization of the stability equation. The technique is validated by comparison with previous stability calculations for circular and elliptic jets. Calculations are performed for the stability characteristics of elliptic and rectangular jets of aspect ratio 2:1. Growth rates, phase velocities, and pressure eigenfunctions are presented. C1 PENN STATE UNIV,DEPT AEROSP ENGN,UNIVERSITY PK,PA 16802. RP BATY, RS (reprint author), SANDIA NATL LABS,DEPT AEROSCI & FLUID DYNAM,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 24 TC 2 Z9 2 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD NOV 15 PY 1995 VL 21 IS 9 BP 763 EP 780 DI 10.1002/fld.1650210905 PG 18 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA TC384 UT WOS:A1995TC38400004 ER PT J AU CHRISTOPHOROU, LG DATSKOS, PG AF CHRISTOPHOROU, LG DATSKOS, PG TI EFFECT OF TEMPERATURE ON THE FORMATION AND AUTODESTRUCTION OF PARENT ANIONS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY LA English DT Article DE AUTODESTRUCTION; PARENT ANION FORMATION; TEMPERATURE EFFECT ID NONDISSOCIATIVE ELECTRON-ATTACHMENT; POLYATOMIC-MOLECULES; RATE CONSTANTS; NEGATIVE-IONS; SF6; DETACHMENT; PERFLUOROBENZENE; AFFINITIES; HEXAFLUOROBENZENE; FLUOROBENZENES AB The effect of temperature on the formation and autodestruction processes of parent anions has been studied for the molecules SF(6), c-C(4)F(6) and C(6)F(6) in a buffer gas of N(2). These processes were studied in the temperature, T, range 300-600 K and over the mean electron energy range [epsilon] = 0.2-1.0 eV. The formation of parent anions seems to depend very little on changes in T below 600 K for all three molecules. However, increases in T from ambient to 600 K enhance dramatically the autodetachment frequency for c-C(4)F(6)(-) and C(4)F(6)(-). This heat-activated autodetachment is related to increases in the internal energy content of the anion and is found to have activation energies of 0.237 and 0.477 eV for c-C(4)F(6)(-) and C(6)F(6)(-), respectively. Under the same experimental conditions the stabilized SF(6)(-) anion does not undergo heat-activated autodetachment. C1 UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV HLTH SCI RES, ATOM MOLEC & HIGH VOLTAGE PHYS GRP, OAK RIDGE, TN 37831 USA. RP CHRISTOPHOROU, LG (reprint author), NIST, BLDG 220, ROOM B344, GAITHERSBURG, MD 20899 USA. NR 72 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1387-3806 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. PD NOV 15 PY 1995 VL 149 BP 59 EP 77 DI 10.1016/0168-1176(95)04229-E PG 19 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA TG497 UT WOS:A1995TG49700008 ER PT J AU ZHAO, JT DONG, ZC VAUGHEY, JT OSTENSON, JE CORBETT, JD AF ZHAO, JT DONG, ZC VAUGHEY, JT OSTENSON, JE CORBETT, JD TI SYNTHESIS, STRUCTURES AND PROPERTIES OF CUBIC R(3)IN AND R(3)INZ PHASES (R=Y, LA, Z=B, C, N, O) - THE EFFECT OF INTERSTITIAL-Z ON THE SUPERCONDUCTIVITY OF LA3IN SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE R(3)INZ COMPOUNDS; INTERSTITIALS; SYNTHESIS; STRUCTURE; SUPERCONDUCTIVITY ID SYSTEM; HOST; CLUSTERS AB Samples of La3In, Y3InCx and La(3)InZ(x) for 0.3 less than or equal to x less than or equal to 1.5, Z = C and O, La3InBx for 0.7 less than or equal to x less than or equal to 1.5, and La3InN were synthesized in welded Ta containers by powder sintering, fusion and annealing techniques. Y3In and La3Ga could not be obtained. All of the R(3)InZ(x) examples were single phase between x approximate to 0.3-0.5 and x approximate to 1.0 and had the inverse perovskite structure (stuffed Cu3Au). Single crystal refinements for Y3InC and La3InN confirmed the type and stoichiometry (, a = 4.9023(7) Angstrom, 5.102(1) Angstrom, and R(F)/R(w) = 1.1/1.3%, 2.2/2.4% respectively). Magnetic susceptibilities measured for both normal and superconducting states showed T-c approximate to 10 K and 10(chi RT)(4) approximate to 4 emu mol(-1) were retained through the B and O series, with some enhancement of density and supercurrent shielding for B and a reduction of both for O. The absence of superconductivity (greater than 2 K) for Y3InC, La3InC and La3InN parallels their 10(chi RT)(4) values of less than or equal to 2 emu mol(-1); the temperature dependencies of chi for these were also notably less than for the superconductors. These last phases are also more brittle. Extended Huckel band calculations indicated appreciable In and B (La-In and La-B) contributions at E(F) for La3InB. Thereafter, the La-Z bonding states rapidly fall in energy as does the amount of La-In bonding at E(F), the last returning somewhat with the electron-richest oxygen interstitial. The decrease in T-c with increasing x in La3InCx parallels a decrease in densities-of-states at E(F). C1 IOWA STATE UNIV SCI & TECHNOL,DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 30 TC 23 Z9 23 U1 3 U2 11 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 NOV 15 PY 1995 VL 230 IS 1 BP 1 EP 12 DI 10.1016/0925-8388(95)01909-X PG 12 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA TJ242 UT WOS:A1995TJ24200002 ER PT J AU KOWALCZYK, TC KOSC, TZ SINGER, KD BEUHLER, AJ WARGOWSKI, DA CAHILL, PA SEAGER, CH MEINHARDT, MB ERMER, S AF KOWALCZYK, TC KOSC, TZ SINGER, KD BEUHLER, AJ WARGOWSKI, DA CAHILL, PA SEAGER, CH MEINHARDT, MB ERMER, S TI CROSS-LINKED POLYIMIDE ELECTROOPTIC MATERIALS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID THERMAL-STABILITY; POLYMERS; SYSTEMS; DEVICES; FILMS AB We report studies of the optical and electro-optic properties of guest-host polymeric nonlinear optical materials based on aromatic, fluorinated, fully imidized, organic soluble, thermally, and photochemically crosslinkable, guest-host polyimides. We have introduced temperature stable nonlinear optical chromophores into these polyimides and studied optical losses, electric field poling, electro-optic properties, and orientational stability. We measured electro-optic coefficients of 5.5 and 12.0 pm/V for ((2,6-Bis(2-(3-(9-(ethyl)carbazolyl))ethenyl)-4H-pyran-4-ylidene)propanedinitrile) DADC- and (4-(Dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran) DCM-doped guest-host systems at 800 nm using a poling field of 1.3 MV/cm. Poling induced nonlinearities in single-layer films were in agreement with the oriented gas model, but were lower in three-layer films due to voltage division across the layers. (C) 1995 American Institute of Physics. C1 AMOCO CORP,AMOCO RES CTR,NAPERVILLE,IL 60566. SANDIA NATL LABS,DIV 1811,ALBUQUERQUE,NM 87185. LOCKHEED RES & DEV DIV,PALO ALTO,CA 94304. RP KOWALCZYK, TC (reprint author), CASE WESTERN RESERVE UNIV,DEPT PHYS,CLEVELAND,OH 44106, USA. RI Singer, Kenneth/G-6553-2011 NR 27 TC 33 Z9 35 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 NOV 15 PY 1995 VL 78 IS 10 BP 5876 EP 5883 DI 10.1063/1.360779 PG 8 WC Physics, Applied SC Physics GA TD633 UT WOS:A1995TD63300002 ER PT J AU LEE, H JONES, ED KURTZ, SR SCHMIEDEL, T HOUGHTON, DC LEE, KS AF LEE, H JONES, ED KURTZ, SR SCHMIEDEL, T HOUGHTON, DC LEE, KS TI OPTICAL DETERMINATION OF THE HEAVY-HERE EFFECTIVE-MASS AND EXCITON BINDING-ENERGY FOR A SI0.83GE0.17/SI QUANTUM-WELL SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID MAGNETOEXCITON GROUND-STATE AB We have measured the diamagnetic shift of band-edge luminescence, no-phonon peak, and phonon sideband from a pseudomorphic, undoped Si0.83Ge0.17/Si quantum well using high-field magnetoluminescence spectroscopy. The quadratic dependence of the diamagnetic shift of the no-phonon luminescence peak suggests that the luminescence originates from excitons. Using a variational calculation, we determine the effective heavy-hole mass and the exciton binding energy to be 0.27m(0) and 14.8 meV, respectively, and compare these results with reported values obtained from other measurement techniques. (C) 1995 American Institute of Physics. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306. NATL RES COUNCIL CANADA,OTTAWA,ON K1A 0R6,CANADA. ELECTR & TELECOMMUN RES INST,YUSONG GU 305600,SOUTH KOREA. NR 22 TC 5 Z9 5 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1995 VL 78 IS 10 BP 6327 EP 6329 DI 10.1063/1.360514 PG 3 WC Physics, Applied SC Physics GA TD633 UT WOS:A1995TD63300069 ER PT J AU SEWELL, TD GUO, Y THOMPSON, DL AF SEWELL, TD GUO, Y THOMPSON, DL TI SEMICLASSICAL CALCULATIONS OF TUNNELING SPLITTING IN MALONALDEHYDE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CLASSICAL TRAJECTORY SIMULATIONS; COUPLED ANHARMONIC OSCILLATORS; UNIMOLECULAR REACTION DYNAMICS; HYDROGENOXALATE ANION; MODE SPECIFICITY; SURFACE AB We have devised a semiclassical procedure based on the Makri-Miller [J. Chem. Phys. 91, 4026 (1989)] model for calculating the eigenvalue splitting in many-atom systems and have used it to Calculate the ground-state splitting in several isotopomers of malonaldehyde. A potential-energy surface that includes all twenty-one vibrational degrees of freedom was constructed based on the available theoretical and experimental information. The results for calculations in which all atoms are allowed full three-dimensional motion are in good agreement with the experimentally measured values. Restricting the molecular motion to a plane leads to an increase in the splitting due to a decrease in the average height and width of the barrier to tunneling when the molecule is not allowed to vibrate transverse to the molecular plane. Low energy mode-specific excitations were used to study the sensitivity of the splitting to the motions of heavy atoms. The results show that the heavy atom motions have significant influence on the tunneling. This study demonstrates that simple semiclassical methods can be used to treat proton tunneling in large systems. (C) 1995 American Institute of Physics. C1 OKLAHOMA STATE UNIV,DEPT CHEM,STILLWATER,OK 74078. RP SEWELL, TD (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 33 TC 90 Z9 90 U1 0 U2 12 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 NOV 15 PY 1995 VL 103 IS 19 BP 8557 EP 8565 DI 10.1063/1.470166 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE364 UT WOS:A1995TE36400024 ER PT J AU SUN, HZ MEZEI, M FYE, R BENHAM, CJ AF SUN, HZ MEZEI, M FYE, R BENHAM, CJ TI MONTE-CARLO ANALYSIS OF CONFORMATIONAL TRANSITIONS IN SUPERHELICAL DNA SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CLOSED CIRCULAR DNA; SUPERCOILED DNA; REPLICATION; STRESS AB Metropolis-Monte Carlo algorithms are developed to analyze the strand separation transition in circular superhelical DNA molecules. Moves that randomize the locations of unpaired regions are required in order to diminish correlations among the sampled states. This approach enables accurate simulations to be performed in reasonable computational times. Sufficient conditions to guarantee the formal correctness of the complete algorithm are proven to hold. The computation time required scales at most quadratically with molecular length, and is approximately independent of linking difference. Techniques are developed to estimate the sample size and other calculation parameters needed to achieve a specified accuracy. When the results of Monte Carlo calculations that use shuffling operations are compared with those from statistical mechanical calculations, excellent agreement is found. The Monte Carlo methodology makes possible calculations of transition behavior in cases where alternative approaches are intractable, such as in long molecules under circumstances where several runs of open base pairs occur simultaneously. It also allows the analysis of transitions in cases where the base pair separation energies vary in complex manners, such as through near-neighbor interactions, or the presence of modified bases, abasic sites, or bound molecules. (C) 1995 American Institute of Physics. C1 MT SINAI SCH MED,DEPT PHYSIOL & BIOPHYS,NEW YORK,NY 10029. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SUN, HZ (reprint author), MT SINAI SCH MED,DEPT BIOMATH SCI,NEW YORK,NY 10029, USA. RI Benham, Craig/G-1512-2013 NR 28 TC 12 Z9 13 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 NOV 15 PY 1995 VL 103 IS 19 BP 8653 EP 8665 DI 10.1063/1.470123 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE364 UT WOS:A1995TE36400032 ER PT J AU AFFHOLTER, KA HENDERSON, SJ WIGNALL, GD BUNICK, GJ HAUFLER, RE COMPTON, RN AF AFFHOLTER, KA HENDERSON, SJ WIGNALL, GD BUNICK, GJ HAUFLER, RE COMPTON, RN TI STRUCTURAL CHARACTERIZATION OF C-60 AND C-70 FULLERENES BY SMALL-ANGLE NEUTRON-SCATTERING (VOL 99, PG 9224, 1993) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Correction, Addition C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV HLTH & SCI RES,OAK RIDGE,TN 37831. RP AFFHOLTER, KA (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 1 TC 5 Z9 5 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1995 VL 103 IS 19 BP 8783 EP 8783 DI 10.1063/1.470738 PG 1 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE364 UT WOS:A1995TE36400044 ER PT J AU DUFFY, PB ELIASON, DE BOURGEOIS, AJ COVEY, CC AF DUFFY, PB ELIASON, DE BOURGEOIS, AJ COVEY, CC TI SIMULATION OF BOMB RADIOCARBON IN 2 GLOBAL OCEAN GENERAL-CIRCULATION MODELS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA ICE MODEL; WORLD OCEAN; ATLANTIC CIRCULATION; DISTRIBUTIONS; SENSITIVITY; C-14 AB We perform simulations using global ocean general circulation models of the uptake by the ocean and the transport within the ocean of C-14 from atmospheric nuclear bomb tests. The models used are (1) a modified version of the Geophysical Fluid Dynamics Laboratory modular ocean model (MOM) configured with simple horizontal subgrid-scale mixing of tracers; (2) the same model using the Gent and McWilliams (1990) subgrid-scale tracer transport parameterization, which includes isopycnal mixing; and (3) the ocean isopycnal (OPYC) model of J. M. Oberhuber, which uses isopycnal subgrid-scale mixing of tracers within an isopycnal coordinate system. In addition, we perform another MOM simulation which illustrates the sensitivity of the results to the thickness of the surface mixed layer. To minimize differences in the results due to differences in forcings, all our simulations use the same formulations for surface fluxes of heat and fresh water and the same sea ice model. In addition, the numerical grids are all nearly the same. Comparison of our model results to revised estimates of oceanic bomb C-14 from the Geochemical Ocean Sections Study observations and to annual mean temperature observations shows that our results are sensitive to the models' treatments of subgrid-scale mixing of tracers and to the thickness of the surface mixed layer. Since the simulated vertical profiles of bomb C-14 or temperature alone can be brought close to the observed profile by adjusting model parameters, we judge the realism of modeled vertical transport by how well vertical profiles of both bomb C-14 and temperature can be simulated with one set of parameter values. By this standard, OPYC does better than our baseline configuration of MOM, which we attribute to the unrealistic treatment of subgrid-scale mixing of tracers and of the surface mixed layer in this simulation. We illustrate this by showing that the use of the Gent and McWilliams tracer transport parameterization results in a markedly improved vertical temperature profile and almost no change in the bomb C-14 distribution, compared with our baseline MOM simulation. Finally, we show that increasing the effective mixed layer thickness in MOM from 30 to 76 m results in a slightly more realistic vertical profile of bomb C-14 but a slightly less realistic temperature profile. RP DUFFY, PB (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,POB 808,L-256,LIVERMORE,CA 94551, USA. NR 38 TC 33 Z9 33 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-OCEANS JI J. Geophys. Res.-Oceans PD NOV 15 PY 1995 VL 100 IS C11 BP 22545 EP 22563 DI 10.1029/95JC01937 PG 19 WC Oceanography SC Oceanography GA TF782 UT WOS:A1995TF78200001 ER PT J AU DRAPER, RN FABER, V AF DRAPER, RN FABER, V TI THE DIAMETER AND AVERAGE DISTANCE OF SUPERTOROIDAL NETWORKS SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article AB The subject of this paper is a family of network topologies which are intended to be practical enough to be implemented in a parallel computer using contemporary technology. These network topologies offer an alternative to the three-dimensional mesh or toroid and are most likely to be useful for a network with between 512 and 16,384 nodes. The topologies, which are called supertoroids, are Cayley graphs of groups. The groups are semidirect products of two cyclic groups, one of order ck and the other of order c(2)l. The resulting Cayley graph has c(3)kl vertices and is of degree 4. The main results of this paper are two theorems. The first states that the diameter of the supertoroidal network with c(3)kl nodes is [cl/2] + [ck/2] if c greater than or equal to 8. The second states that the average distance is asymptotically (in c) equal to ([cl/2] + [ck/2])/2. Because of these facts, the supertoroidal network has latency which is lower than the latency of a three-dimensional toroid of the same size. Although the proofs of these theorems are a tour-de-force of arithmetic in the underlying group, they are based upon exploitation of parallelism of paths in a Cayley graph. (C) 1995 Academic Press, Inc. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DRAPER, RN (reprint author), CTR SUPERCOND RES,17100 SCI DR,BOWIE,MD 20715, USA. NR 18 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD NOV 15 PY 1995 VL 31 IS 1 BP 1 EP 13 DI 10.1006/jpdc.1995.1140 PG 13 WC Computer Science, Theory & Methods SC Computer Science GA TF529 UT WOS:A1995TF52900001 ER PT J AU HARRISON, WTA DUSSACK, LL VOGT, T JACOBSON, AJ AF HARRISON, WTA DUSSACK, LL VOGT, T JACOBSON, AJ TI SYNTHESES, CRYSTAL-STRUCTURES, AND PROPERTIES OF NEW LAYERED TUNGSTEN(VI)-CONTAINING MATERIALS BASED ON THE HEXAGONAL-WO3 STRUCTURE - M(2)(WO3)(3)SEO3 (M=NH4,RB,CS) SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID X-RAY; DIFFRACTION AB The hydrothermal syntheses and crystal structures of (NH4)(2)(WO3)(3)SeO3 and Cs-2(WO3)(3)SeO3, two new noncentrosymmetric, layered tungsten(VI)-containing phases are reported. Infrared, Raman, and thermogravimetric data are also presented. (NH4)(2)(WO3)(3)SeO3 and Cs-2(WO3)(3)SeO3 are isostructural phases built up from hexagonal-tungsten-oxide-like, anionic layers of vertex-sharing WO6 octahedra, capped on one side by Se atoms (as selenite groups). Interlayer NH4+ or Cs+ cations provide charge balance. The full II-bonding scheme in (NH4)(2)(WO3)(3)SeO3 has been elucidated from Rietveld refinement against neutron powder diffraction data. The WO6 octahedra display a 3 short + 3 long W-O bond-distance distribution within the WO6 unit in both these phases. (NH4)(2)(WO3)(3)SeO3 and Cs-2(WO3)(3)SeO3 are isostructural with their molybdenum(VI)-containing analogues (NH4)(2)(MoO3)(3)SeO3 and Cs-2 (MoO3)(3)SeO3. Crystal data: (NH4)(2)(WO3)(3)SeO3, M(r) = 858.58, hexagonal, space group P6(3) (No. 173), a = 7.2291(2) Angstrom, c = 12.1486(3) Angstrom, V = 549.82(3) Angstrom(3), Z = 2, R(p) = 1.81%, and R(wp) = 2.29% (2938 neutron powder data). Cs-2(WO3)(3)SeO3, M(r) = 1088.31, hexagonal, space group P6(3) (no. 173), a = 7.2615(2) Angstrom, c = 12.5426(3) Angstrom, V = 572.75(3) Angstrom(3), Z = 2, R(p) = 4.84%, and R(wp) = 5.98% (2588 neutron powder data). (C) 1995 Academic Press, Inc. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP HARRISON, WTA (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. RI Vogt, Thomas /A-1562-2011 OI Vogt, Thomas /0000-0002-4731-2787 NR 17 TC 31 Z9 31 U1 1 U2 9 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD NOV 15 PY 1995 VL 120 IS 1 BP 112 EP 120 DI 10.1006/jssc.1995.1385 PG 9 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA TG682 UT WOS:A1995TG68200020 ER PT J AU VANDERAH, TA HUANG, Q WONGNG, W CHAKOUMAKOS, BC GOLDFARB, RB GEYER, RG BAKERJARVIS, J ROTH, RS SANTORO, A AF VANDERAH, TA HUANG, Q WONGNG, W CHAKOUMAKOS, BC GOLDFARB, RB GEYER, RG BAKERJARVIS, J ROTH, RS SANTORO, A TI PREPARATION, CRYSTAL-STRUCTURE, DIELECTRIC-PROPERTIES, AND MAGNETIC-BEHAVIOR OF BA2FE2TI4O13 SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID FERRITE AB The preparation, crystal structure, dielectric properties, and magnetic behavior of the new compound Ba2Fe2Ti4O13 are reported. Structural studies carried out by single-crystal X-ray diffraction and neutron powder diffraction show that this phase is isostructural with K2Ti6O13 and Ba2ZnTi5O13 (C2/m (No. 12); a = 15.216(1), b = 3.8979(3), c = 9.1350(6) Angstrom, beta = 98.460(7)degrees; V = 535.90(8) Angstrom(3); Z = 2). The cations Fe3+ and Ti4+ are partially ordered among distorted octahedral sites with Ba2+ occupying eleven-coordinated polyhedra. Ba2Fe2Ti4O13 exhibits TE(0) resonance near 10 GHz with a dielectric constant of similar to 28 and a dielectric loss tangent of 2 x 10(-3). The compound displays complex paramagnetic behavior with marked field dependence; the magnetization at 80 kA/m is several orders of magnitude smaller than that of most ferrites. Spin-glass effects have not been observed; however, weak collective interactions are clearly present. No magnetic ordering has been detected by neutron diffraction down to 13 K. (C) Academic Press,Inc. C1 UNIV MARYLAND,COLLEGE PK,MD 20742. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. NATL INST STAND & TECHNOL,BOULDER,CO 80303. RP VANDERAH, TA (reprint author), NIST,GAITHERSBURG,MD 20899, USA. RI Chakoumakos, Bryan/A-5601-2016; Goldfarb, Ronald/A-5493-2011 OI Chakoumakos, Bryan/0000-0002-7870-6543; Goldfarb, Ronald/0000-0002-1942-7974 NR 14 TC 6 Z9 6 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD NOV 15 PY 1995 VL 120 IS 1 BP 121 EP 127 DI 10.1006/jssc.1995.1386 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA TG682 UT WOS:A1995TG68200021 ER PT J AU JENTZEN, W SIMPSON, MC HOBBS, JD SONG, X EMA, T NELSON, NY MEDFORTH, CJ SMITH, KM VEYRAT, M MAZZANTI, M RAMASSEUL, R MARCHON, JC TAKEUCHI, T GODDARD, WA SHELNUTT, JA AF JENTZEN, W SIMPSON, MC HOBBS, JD SONG, X EMA, T NELSON, NY MEDFORTH, CJ SMITH, KM VEYRAT, M MAZZANTI, M RAMASSEUL, R MARCHON, JC TAKEUCHI, T GODDARD, WA SHELNUTT, JA TI RUFFLING IN A SERIES OF NICKEL(II) MESO-TETRASUBSTITUTED PORPHYRINS AS A MODEL FOR THE CONSERVED RUFFLING OF THE HEME OF CYTOCHROMES-C SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID RESONANCE RAMAN-SPECTRA; CHARGE-TRANSPORT-PROPERTIES; DIFFERENTIAL-OVERLAP TECHNIQUE; LIGHT-ABSORPTION PROPERTIES; TRANSITION-METAL COMPLEXES; INTERMEDIATE NEGLECT; FORCE-FIELD; PHOTOSYNTHETIC CHROMOPHORES; NONPLANAR DISTORTION; MOLECULAR-STRUCTURE AB Metalloporphyrins undergo remarkable nonplanar distortions of the macrocycle that perturb the chemical and photochemical properties of these important protein cofactors. Further, the tertiary structure of the surrounding protein can manipulate these distortions as a means of regulating biological function. For cytochromes c, for example, an energetically unfavorable, conserved nonplanar distortion of the heme exists and likely plays a role in its electron-transfer function. The heme distortion is primarily of the ruffling (run type (corresponding to the lowest frequency B-1u-symmetry normal mode) in which the pyrroles are twisted about the metal-N-pyrrole bond. This B-1u-symmetry nonplanar distortion is commonly observed in metalloporphyrin crystal structures, as are the saddling (sad) B-2n-symmetry distortion, waving (wav) E(g)-symmetry distortions, and doming (dom) A(2u)-symmetry distortion. Each of these nonplanar distortions is expected to result in unique alterations of the chemical and physical properties of the nominally planar porphyrin macrocycle. Symmetrical porphyrin substitution with tetrahedrally bonded atoms at the four meso bridging carbons generally results in the B-1u ruffling distortion; therefore, we investigated a series of meso-tetrasubstituted porphyrins for which the substituents vary in size (methyl, ethyl, propyl, pentyl, isopropyl, cyclopropyl derivative 11a, cyclohexyl, apopinenyl (10), tert-butyl, adamantyl), increasing the steric crowding at the periphery. Molecular mechanics calculations show increasing degree of ruffling (CalphaNNCalpha angle for opposite pyrroles varies from 0 to 57 degrees) for this series of porphyrins, generally agreeing with the X-ray structures that are available. In addition, the frequencies of the structure-sensitive Raman lines decrease nonlinearly with increasing ruffling angle. The localization of the B-1u nonplanar distortion in only the C(a)lpha-C-m bond torsion (not the case for the B-2u sad distortion) suggests a means by which the B-1u distortion might be distinguished from other types of nonplanar distortion by using resonance Raman spectroscopy. Also, the size of the red shifts in the pi-->pi* absorption bands depends on C(a)lpha-C-m torsion angle in a nonlinear fashion and the shift is accurately predicted by INDO/s molecular orbital calculations when the nonplanar structures obtained from molecular mechanics are used. C1 SANDIA NATL LABS,DEPT FUEL SCI,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. CEN GRENOBLE,CEA,DEPT RECH FONDAMENTALE MAT CONDENSEE,SESAM,CHIM COORDINAT LAB,F-38054 GRENOBLE,FRANCE. CALTECH,BECKMAN INST,CTR MAT & PROC SIMULAT,PASADENA,CA 91125. RI Shelnutt, John/A-9987-2009; Simpson, Miriam/C-4237-2011; EMA, Tadashi/B-2103-2011; Medforth, Craig/D-8210-2013; REQUIMTE, FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; EMA, Tadashi/0000-0002-2160-6840; Medforth, Craig/0000-0003-3046-4909; Smith, Kevin/0000-0002-6736-4779 NR 73 TC 247 Z9 248 U1 3 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 15 PY 1995 VL 117 IS 45 BP 11085 EP 11097 DI 10.1021/ja00150a008 PG 13 WC Chemistry, Multidisciplinary SC Chemistry GA TE739 UT WOS:A1995TE73900008 PM 27275517 ER PT J AU THOMPSON, MA AF THOMPSON, MA TI A QM/MM MOLECULAR-DYNAMICS STUDY OF THE POTENTIAL OF MEAN FORCE FOR THE ASSOCIATION OF K+ WITH DIMETHYL ETHER IN AQUEOUS-SOLUTION SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SIMULATIONS; COMPLEXES; ALKALI; 18-CROWN-6; STABILITY; SOLVATION; CHEMISTRY; WATER; ION AB We present a hybrid Quantum Mechanical/Molecular Mechanical (QM/MM) molecular dynamics study of the free energy profile for the association of K+ with dimethyl ether (DME) in H2O. The QM/MM method employs the semiempirical AM1 method to describe DME, the MM parametrization of Dang for K+, and the SPC/E model for H2O. The electrostatic and van der Waals parameters for the QM/MM coupling terms, which describe the interaction of K+/DME and H2O/DME, have been previously described.(1) We calculate a potential of mean force and fmd a weak solvent separated ion-dipole pair (SSIDP) at 5.4 Angstrom separation and a contact ion-dipole (CIDP) free energy minimum at 2.7 Angstrom separation of the K+ with the oxygen of DME. The latter distance agrees well with the gas-phase optimized K+/DME structure. There is a 3-kcal/mol barrier separating the CIDP and SSIDP which is centered at 3.8 Angstrom K+/DME separation. The estimated Delta A(bind) for the CIDP is 0.9 +/- 0.1 kcal/mol which predicts that K+/DME is not a strongly bound complex in aqueous solution. The SSIDP has only a 0.2-kcal/mol barrier separating it from completely uncomplexed K+/DME, and it also does not represent a stable bound structure. K+ and its first solvation shell waters exert an opposite effect an repolarizing the wave function of DME when the latter is inside the 3.8-Angstrom barrier. However, outside this barrier, both the solvent and the cation act to enhance the induced dipole moment of DME. This study demonstrates the nonadditive interactions of a solvated cation with a simple monodentate organic ligand. These results are useful for interpreting K+ complexation by multidentate ligands, such as the crown ethers. RP THOMPSON, MA (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. NR 35 TC 17 Z9 17 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 15 PY 1995 VL 117 IS 45 BP 11341 EP 11344 DI 10.1021/ja00150a036 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA TE739 UT WOS:A1995TE73900036 ER PT J AU LIU, CT AF LIU, CT TI RECENT ADVANCES IN ORDERED INTERMETALLICS SO MATERIALS CHEMISTRY AND PHYSICS LA English DT Review DE INTERMETALLICS; FRACTURE; MICROSTRUCTURE; ALLOY DESIGN; ALUMINIDES ID INTERGRANULAR HYDROGEN EMBRITTLEMENT; GAMMA-TITANIUM ALUMINIDE; GRAIN-BOUNDARY FRACTURE; ENVIRONMENTAL EMBRITTLEMENT; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; NICKEL ALUMINIDES; ALLOYS; TEMPERATURE; DUCTILITY AB Ordered intermetallic alloys based on aluminides and silicides offer many advantages for structural use at elevated temperatures in hostile environments. Their attractive properties include excellent oxidation and corrosion resistance, light weight, and superior strength at elevated temperatures. The major concern for structural use of intermetallics was their low ductility and poor fracture resistance at ambient temperatures. For the past ten years, considerable effort has been devoted to the research and development of ordered intermetallic alloys, and good progress has been made on understanding intrinsic and extrinsic factors controlling brittle fracture in intermetallic alloys based on aluminides and silicides. Parallel efforts on alloy design have led to the development of a number of ductile and strong intermetallic alloys based on Ni(3)Al, NiAl, Fe(3)Al, FeAl, Ti(3)Al and TiAl systems for structural applications. RP LIU, CT (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 83 TC 85 Z9 97 U1 2 U2 20 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0254-0584 J9 MATER CHEM PHYS JI Mater. Chem. Phys. PD NOV 15 PY 1995 VL 42 IS 2 BP 77 EP 86 DI 10.1016/0254-0584(95)01546-9 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA TB857 UT WOS:A1995TB85700001 ER PT J AU Ogborn, JS Olson, DL Cieslak, MJ AF Ogborn, JS Olson, DL Cieslak, MJ TI Influence of solidification on the microstructural evolution of nickel base weld metal SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article DE nickel base alloys; microsegregation; M(d) calculations ID ANALYTICAL ELECTRON-MICROSCOPY; SYSTEM AB The effect of segregation resulting from solidification on the microstructural evolution of nickel base alloys was investigated. Two different groups of alloys were produced to simulate either the Hastelloy C type or the Inconel 625/718 type of alloys. Gravitational thermal analysis welding was performed on these experimental alloys and the extent of microsegregation in the weld metal was determined. Using composition profiles obtained from solidified microstructures, predictions of the phase stability of these microstructures were made based on metal d-level (M(d)) calculations. The maximum M(d) values obtained in these microstructures were compared with those critical to the formation of topologically close-packed (TCP) phases such as sigma, P, and Laves. These profiles showed an increase in the M(d) level in the interdendritic regions which was correlated to the formation of TCP phases. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP Ogborn, JS (reprint author), COLORADO SCH MINES,CTR WELDING & JOINING RES,DEPT MAT & MET ENGN,GOLDEN,CO 80401, USA. NR 24 TC 26 Z9 30 U1 1 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD NOV 15 PY 1995 VL 203 IS 1-2 BP 134 EP 139 DI 10.1016/0921-5093(95)09832-1 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TM628 UT WOS:A1995TM62800014 ER PT J AU Chen, CL Song, SG Gray, GT Tsong, TT AF Chen, CL Song, SG Gray, GT Tsong, TT TI Field ion microscopy observation of mechanical twinning in pure iridium SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article DE field ion microscopy; mechanical twinning; iridium AB Mechanical twins were observed in pure Ir using field ion microscopy. The twinning plane and shear direction were determined to be {111} and 1/6[112] respectively. Results of the morphological examination of the twin boundaries and of the coincident site lattice analysis of the twin-matrix lattice relationship suggest that these twins were formed via the stepwise nucleation and growth mechanism rather than the dislocation pole mechanism. C1 ACAD SINICA,INST PHYS,TAIPEI 11529,TAIWAN. RP Chen, CL (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD NOV 15 PY 1995 VL 203 IS 1-2 BP 415 EP 419 DI 10.1016/0921-5093(95)09869-0 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TM628 UT WOS:A1995TM62800046 ER PT J AU KOWALCZYK, TC SINGER, KD CAHILL, PA AF KOWALCZYK, TC SINGER, KD CAHILL, PA TI ANOMALOUS-DISPERSION PHASE-MATCHED 2ND-HARMONIC GENERATION IN A POLYMER WAVE-GUIDE SO OPTICS LETTERS LA English DT Article ID 2ND-HARMONIC GENERATION; WAVE-GUIDE AB We demonstrate phase-matched second-harmonic generation in a poled polymer waveguide, using anomalous-dispersion phase matching. Phase matching was achieved between lowest-order fundamental and harmonic modes, TM(0)(omega) to TMB(0)(2 omega), ata fundamental wavelength of 815 nm over a propagation length of 32 mu m. The maximum conversion efficiency was eta(exp) = 39%/W cm(2), in good agreement with theory. (C) 1995 Optical Society of America C1 SANDIA NATL LABS,DEPT 1811,ALBUQUERQUE,NM 87185. RP KOWALCZYK, TC (reprint author), CASE WESTERN RESERVE UNIV,DEPT PHYS,CLEVELAND,OH 44106, USA. RI Singer, Kenneth/G-6553-2011 NR 15 TC 21 Z9 21 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 15 PY 1995 VL 20 IS 22 BP 2273 EP 2275 DI 10.1364/OL.20.002273 PG 3 WC Optics SC Optics GA TD689 UT WOS:A1995TD68900005 PM 19865190 ER PT J AU CHOW, WW AF CHOW, WW TI NONEQUILIBRIUM AND MANY-BODY COULOMB EFFECTS IN THE RELAXATION OSCILLATION OF A SEMICONDUCTOR-LASER SO OPTICS LETTERS LA English DT Article AB A treatment of the dynamics in a semiconductor laser that is based on the coupled Maxwell-semiconductor-Bloch equations is described. It is shown that intraband carrier dynamics and interband Coulomb interactions significantly affect the damping of relaxation oscillations. The specific case of a vertical-cavity surface-emitting laser is treated. (C) 1995 Optical Society of America RP CHOW, WW (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 15 PY 1995 VL 20 IS 22 BP 2318 EP 2320 DI 10.1364/OL.20.002318 PG 3 WC Optics SC Optics GA TD689 UT WOS:A1995TD68900020 PM 19865205 ER PT J AU HUDSON, EA REHR, JJ BUCHER, JJ AF HUDSON, EA REHR, JJ BUCHER, JJ TI MULTIPLE-SCATTERING CALCULATIONS OF THE URANIUM L(3)-EDGE X-RAY-ABSORPTION NEAR-EDGE STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID FINE-STRUCTURE; PHOTOEMISSION SPECTRA; ACTINIDE COMPOUNDS; EXAFS; ADSORBATES; STATES AB A theoretical study of the uranium L(3)-edge x-ray absorption near-edge structure (XANES) is presented for several uranium compounds, including oxides, intermetallics, uranyl fluoride, and alpha-uranium. Calculations were performed using FEFF6, an ab initio multiple-scattering (MS) code that includes the most important features of current theories. The results, which account for both the fine structure chi and the atomiclike background mu(0) of the absorption coefficient mu, are compared to new and previously measured experimental spectra, reavealing very good agreement for most systems. For several compounds, a more detailed theoretical analysis determined the influence of cluster size and scattering order upon the calculated spectra. Results indicate that MS paths and scattering paths that include rather distant atoms make significant contributions for UO2, whereas XANES for crystals with lower symmetry and density can be modeled using only shorter single-scattering paths. In most cases, assumption of a screened final state in the calculation gives better agreement with experiment than use of an unscreened final state. The successful modeling of spectra for a variety of different uranium compounds, with differing spectral features, indicates that the semirelativistic treatment of XANES used here is adequate even for heavy elements. The well-known resonance, observed experimentally for uranyl (UO22+) compounds approximate to 15 eV above the white line, is successfully modeled here for the first time, using multiple-scattering paths within the O-U-O axial bonds. Overlapping muffin-tin spheres were required in the calculation, probably as a result of the short uranyl axial bonds. C1 UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. LAWRENCE LIVERMORE NATL LAB,DIV CHEM SCI,LIVERMORE,CA 94551. RP HUDSON, EA (reprint author), LAWRENCE LIVERMORE NATL LAB,GLENN T SEABORG INST TRANSACTINIUM SCI,LIVERMORE,CA 94551, USA. NR 51 TC 67 Z9 67 U1 3 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13815 EP 13826 DI 10.1103/PhysRevB.52.13815 PG 12 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000031 ER PT J AU EMIN, D AF EMIN, D TI EFFECT OF ELECTRONIC CORRELATION ON THE SHAPE OF A LARGE BIPOLARON - 4-LOBED PLANAR LARGE BIPOLARON IN AN IONIC MEDIUM SO PHYSICAL REVIEW B LA English DT Article ID 3 DIMENSIONS; TEMPERATURE; SUPERCONDUCTIVITY AB The shape of a large bipolaron is considered for self-trapped carriers confined within a plane that is immersed within a strongly ionic medium. For a wide enough electronic energy band, correlation effects determine a large bipolaron's shape. Then a stable large bipolaron is found in which the two self-trapped carriers occupy mutually perpendicular dumbbell-shaped orbitals. This arrangement gives the self-trapped carriers a planar four-lobed charge density. With progressively narrower electronic bands, the short-range electron-lattice interactions become increasingly important. Then the stable solution shifts to that of a large bipolaron with a circularly symmetric shape. With a still narrower electronic band, the stable solution collapses to that of a small (single-site) bipolaron. Thus, there can be at least three types of stable planar bipolarons in an ionic medium: (1) a four-lobed large bipolaron, (2) a circularly symmetric large bipolaron, and (3) a small bipolaron. The forces between noncircularly symmetric bipolarons depend on their shapes and relative orientations. As a result, large bipolarons' shapes can affect how and if they order in their ground state. RP EMIN, D (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 28 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13874 EP 13882 DI 10.1103/PhysRevB.52.13874 PG 9 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000036 ER PT J AU PITARKE, JM RITCHIE, RH ECHENIQUE, PM AF PITARKE, JM RITCHIE, RH ECHENIQUE, PM TI QUADRATIC RESPONSE THEORY OF THE ENERGY-LOSS OF CHARGED-PARTICLES IN AN ELECTRON-GAS SO PHYSICAL REVIEW B LA English DT Article ID ANTIPROTON STOPPING POWER; Z(1)(3) CORRECTION; SLOW IONS; DIAGRAMS; FORMULA; RANGE AB A quadratic response theory of the energy loss of charged particles in matter is developed, following a diagrammatic analysis of the many-body interactions between a moving charge and the electron gas. The linear and quadratic density response functions of the medium are evaluated in the random-phase approximation (RPA), and a result for the stopping power is obtained, up to third order in the ion charge, Z(1)e, for a wide range of particle velocities. The low- and high-velocity limits of the full RPA result are also studied, and a local plasma approximation is used to show that our calculations are in good agreement with measurements of the energy loss of protons and antiprotons in silicon. C1 EUSKAL HERRIKO UNIBERTSITATEA, KIMIKA FALKULTEA, MAT FIS SAILA, E-20080 DONOSTIA, SPAIN. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP EUSKAL HERRIKO UNIBERTSITATEA, ZIEMTZI FALKULTATEA, MAT KONDENTSATUAREN FIS SAILA, E-48080 BILBAO, SPAIN. RI Pitarke, Jose/C-8602-2009 OI Pitarke, Jose/0000-0002-8253-8028 NR 56 TC 68 Z9 68 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13883 EP 13902 DI 10.1103/PhysRevB.52.13883 PG 20 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000037 ER PT J AU KEMP, M BRANZ, HM AF KEMP, M BRANZ, HM TI HYDROGEN DIFFUSION IN A-SI-H - SOLUTION OF THE TRACER EQUATIONS INCLUDING CAPTURE BY EXCHANGE SO PHYSICAL REVIEW B LA English DT Article ID AMORPHOUS-SILICON; ALPHA-SI AB We propose a model of trap-controlled diffusion in which diffusing atoms can be captured either by trapping at an empty trap or by exchange with chemically identical trapped atoms of different isotope number. We solve the model's equations describing tracer diffusion experiments, and compare the predictions in the cases of dominant exchange and of dominant trapping. Comparison with experiments in a-Si:H shows that exchange is the dominant capture mechanism in D tracer diffusion measurements. This allows us to understand the relatively short distance (similar to 200 Angstrom) D travels before trapping. It also reconciles the smoothness of the D tracer diffusion profiles at long times with the existance of deeply bound (> 2.0 eV)H in a-Si:H. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP KEMP, M (reprint author), ECOLE POLYTECH,DEPT ENGN PHYS,MONTREAL,PQ H3C 3A7,CANADA. NR 20 TC 27 Z9 27 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13946 EP 13954 DI 10.1103/PhysRevB.52.13946 PG 9 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000043 ER PT J AU ZHANG, SB WEI, SH ZUNGER, A AF ZHANG, SB WEI, SH ZUNGER, A TI D-BAND EXCITATIONS IN II-VI SEMICONDUCTORS - A BROKEN-SYMMETRY APPROACH TO THE CORE-HOLE SO PHYSICAL REVIEW B LA English DT Article ID SELF-INTERACTION CORRECTION; DENSITY-FUNCTIONAL FORMALISM; ELECTRONIC-STRUCTURE; TOTAL-ENERGY; ZNS; STATES; VALENCE; PHOTOEMISSION; ZINCBLENDE; SPECTRA AB Local-density approximation (LDA) band-structure calculations place the 3d band of zinc-blende ZnO, ZnS, ZnSe, and ZnTe at 5.4, 6.4, 6.8, and 7.5 eV below the valence-band maximum (VBM), while photoemission measurements place them at 7.8, 9.0, 9.4, and 9.8 eV below the VBM, respectively. We show that this similar to 3-eV LDA error can be accounted for using a ''broken symmetry'' band-structure approach. In this approach, a d core hole is placed in an impuritylike splitoff d subband resulting from the creation of the hole on a particular Zn sublattice. Self-consistent solutions to such a constrained LDA problem reveal that the final hole state is sufficiently localized to trigger a self-interaction correction of 3-4 eV, needed to explain the discrepancy with experiment. This 3-4 eV shift is reduced, by screening effects, from the 9.7-eV value in a free Zn atom. Finally, we calculated the binding energy E(Mn) for Mn 3d states in ZnTe:Mn and the effective Coulomb interaction parameter U-eff. Significant improvements over the results of local-spin-density calculations were found. The calculated E(Mn) = E(VBM) - 3.93 eV and U-eff = 6.85 eV are in good agreement with experiments. RP ZHANG, SB (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013; Krausnick, Jennifer/D-6291-2013; Zhang, Shengbai/D-4885-2013 OI Zhang, Shengbai/0000-0003-0833-5860 NR 66 TC 39 Z9 39 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 NOV 15 PY 1995 VL 52 IS 19 BP 13975 EP 13982 DI 10.1103/PhysRevB.52.13975 PG 8 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000046 ER PT J AU FRANCESCHETTI, A WEI, SH ZUNGER, A AF FRANCESCHETTI, A WEI, SH ZUNGER, A TI EFFECTS OF ORDERING ON THE ELECTRON EFFECTIVE-MASS AND STRAIN DEFORMATION POTENTIAL IN GAINP2 - DEFICIENCIES OF THE K-CENTER-DOT-P MODEL SO PHYSICAL REVIEW B LA English DT Article ID PLANE-WAVE METHOD; LONG-RANGE ORDER; SEMICONDUCTOR ALLOYS; ENERGY AB The conventional eight-band k . p model predicts a decrease of the electron effective mass and no dependence of the (001) strain band-gap deformation potential with the degree eta of long-range order in Ga0.5In0.5P alloys. We show that a complete band-structure approach predicts instead that (i) the electron effective mass in the ordering direction increases from 0.092m(0) for eta = 0 (random alloy) to 0.133m(0) for eta = 1 (ordered alloy), and (ii) the strain deformation potential decreases in magnitude from 8.26 eV for eta = 0 to 6.34 eV for eta = 1. These two effects are caused by the mixing of the conduction-band minimum with the L-derived conduction band, neglected in the standard eight-band model. RP FRANCESCHETTI, A (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 39 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13992 EP 13997 DI 10.1103/PhysRevB.52.13992 PG 6 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000048 ER PT J AU STODDARD, RD CONRADI, MS MCDOWELL, AF AF STODDARD, RD CONRADI, MS MCDOWELL, AF TI ATOMIC MOTIONS IN AN UNUSUAL MOLECULAR SEMICONDUCTOR - NASN SO PHYSICAL REVIEW B LA English DT Article ID BETA-NASN; ALLOYS; SN AB Recent investigations of the compound NaSn (1:1) have indicated that both fast conduction of Na+ cations and rapid reorientations of (Sn-4)(4-) anions are present in the high-temperature solid phase, alpha-NaSn. We have used Na-23 and Sn-119 nuclear magnetic resonance to separately monitor the motions of Na and Sn in the low-temperature ordered solid phase, beta-NaSn, where the correlation times of the motions are much longer. The Na+ motions are evident in T-1, T-1 rho, T-2, and T-2* (linewidth) Na-23 data at magnetic fields of 8.0 and 2.0 T. The Na motions are described by a single time constant with thermal activation parameters E(a)/k(B) = 9700 K and omega(D)(infinity) = 1.7 x 10(14) s(-1). Sn motions are evident in T-2, line shape, and stimulated echo data taken at 8.0 T. Sn-119 stimulated echo data unequivocally show the Sn motion to be reorientations of Snr tetrahedra; any diffusion of Sn between tetrahedra is much slower. The combined Ta and stimulated echo data for Sn-119 demonstrate that the Sn-4 reorientations are thermally activated with E(a)/k(B) = 13 800 K and omega(R)(infinity) = 2.3 x 10(15) s(-1). The temperature dependence of the Sn-119 T-1 fits an activation energy of 7000 K; the Sn T-1 is believed to be due to thermally-activated charge carriers. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP STODDARD, RD (reprint author), WASHINGTON UNIV,DEPT PHYS 1105,1 BROOKINGS DR,ST LOUIS,MO 63130, USA. NR 25 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13998 EP 14005 DI 10.1103/PhysRevB.52.13998 PG 8 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000049 ER PT J AU GOTHELID, M HAMMAR, M KARLSSON, UO WIGREN, C LELAY, G AF GOTHELID, M HAMMAR, M KARLSSON, UO WIGREN, C LELAY, G TI STRUCTURAL AND ELECTRONIC EVOLUTION ON THE GE(111)-AG SURFACE SO PHYSICAL REVIEW B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; SI(111); SILVER; REGISTRATION; GERMANIUM; GEOMETRY; AG AB High-resolution core-level photoelectron spectroscopy has been used to study three different silver induced surface reconstructions on the Ge(111) surface. At the lowest coverage a (4 X 4) structure is formed, which displays a similar Ge 3d core-level line shape as the clean c(2 X 8) surface. Details in the spectra are discussed with respect to possible models. The Ge(111)-Ag (root 3 X root 3)R30 degrees structure Ge 3d spectrum is dominated by a very strong contribution assigned to the two topmost Ge layers in a missing top layer structure, similar to the Si(111)-Ag (root 3 X root 3)R30 degrees surface. A weak bulk peak is present on the high-binding-energy side of the spectrum, while a third contribution assigned to Ge in phase boundaries is included in the fit on the lower-binding-energy side. A comparison with results obtained from the Ge(111)-Au root 3 structure points to substantial differences between the two noble-metal-induced root 3 reconstructions on the Ge(111) surface. Finally, after further deposition of silver at room temperature, the root 3 geometry is locally broken creating a (6 X 6) structure and a new surface-related peak emerges on the low-binding-energy side of the Ge 3d spectrum, which was interpreted as being due to Ge atoms floating on top of the outermost surface layer. The valence band also revealed the existence of small metallic silver islands. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. CNRS,CTR RECH MECANISMES CROISSANCE CRISTALLINE,F-13288 MARSEILLE 09,FRANCE. RP GOTHELID, M (reprint author), ROYAL INST TECHNOL,DEPT PHYS,S-10044 STOCKHOLM,SWEDEN. NR 27 TC 13 Z9 13 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 14104 EP 14110 DI 10.1103/PhysRevB.52.14104 PG 7 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000062 ER PT J AU HIRSCHMUGL, CJ WILLIAMS, GP AF HIRSCHMUGL, CJ WILLIAMS, GP TI CHEMICAL-SHIFTS AND COUPLING INTERACTIONS FOR THE BONDING VIBRATIONAL-MODES FOR CO/CU(111) AND CO/CU(100) SURFACES SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION INFRARED-SPECTROSCOPY; CO; CU(111); PHOTOEMISSION; CU(001); CU(100) AB Low-frequency infrared reflection absorption spectra have been measured for isotopid mixtures of CO and C-13 O-18 on Cu(100) and (111) surfaces. Although the integrated intensities are only 1/100 of those for the intramolecular modes, both the carbon-metal and the dipole-forbidden hindered rotational modes can clearly be seen in the spectral range 250-350 cm(-1) for both isotopes in the admixtures. The data thus allow chemical shifts to be distinguished from coupling effects for these two bonding modes. For the two surfaces, the normalized chemical frequency shifts for the C-O stretch are very similar. However, dramatic differences are observed for the modes directly related to the bonding, i.e., the C-metal stretch and the hindered rotation. The dominant coupling mechanism for the perpendicular modes is shown to be dipole-dipole coupling, as confirmed by a comparison to coherent potential approximation calculations. For the parallel modes the data cannot be explained in terms of dipole-dipole coupling, and we postulate that the surface state present on the (111) surface is largely responsible for the observed behavior. When the data are interpreted using a model assuming point dipoles, then the vibrational polarizability can be determined for these modes. A more stringent test of the theory is also provided through estimates of the polarizability obtained from intensities of the carbon-metal stretch mode. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 25 TC 22 Z9 22 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 14177 EP 14184 DI 10.1103/PhysRevB.52.14177 PG 8 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000072 ER PT J AU LEES, MR BARRATT, J BALAKRISHNAN, G PAUL, DMK YETHIRAJ, M AF LEES, MR BARRATT, J BALAKRISHNAN, G PAUL, DMK YETHIRAJ, M TI INFLUENCE OF CHARGE AND MAGNETIC-ORDERING ON THE INSULATOR-METAL TRANSITION IN PR1-XCAXMNO3 SO PHYSICAL REVIEW B LA English DT Note ID MAGNETORESISTANCE; PEROVSKITES AB A detailed study of the properties of Pr1-xCaxMnO3 shows that for a range of compositions (0.3 less than or equal to x<0.5) there is a first-order magnetic-field-induced insulator-metal transition. For the x= 0.4 composition the magnetic and charge ordering (CO) effects are decoupled with antiferromagnetic (AFM) ordering, T-N=170 K, developing at considerably lower temperatures than the CO state, T-CO=250 K. Below the CO temperature, metamagnetic transitions exist that transform the magnetic correlations from either paramagnetic or AFM to ferromagnetic. Metastable conducting states are formed below 25 K. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP LEES, MR (reprint author), UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. RI Lees, Martin/D-9584-2013; Balakrishnan, Geetha/P-5977-2016 OI Lees, Martin/0000-0002-2270-2295; Balakrishnan, Geetha/0000-0002-5890-1149 NR 18 TC 124 Z9 125 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14303 EP 14307 DI 10.1103/PhysRevB.52.R14303 PG 5 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200001 ER PT J AU SUN, SN KIOUSSIS, N LIM, SP GONIS, A GOURDIN, WH AF SUN, SN KIOUSSIS, N LIM, SP GONIS, A GOURDIN, WH TI IMPURITY EFFECTS ON ATOMIC BONDING IN NI3AL SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; INTERGRANULAR FRACTURE; SINGLE-CRYSTALS; FERMI-SURFACE; BORON; EMBRITTLEMENT; SEGREGATION; BEHAVIOR; SYSTEMS; SULFUR AB First-principles electronic structure calculations based on the full-potential linear-muffin-tin-orbital method have been employed to study the contrasting effects of boron and hydrogen on the electronic structure of the L 1(2) ordered intermetallic Ni3Al. The total energy, the site- and l-projected densities of states, and the impurity-induced charge-density characteristics are calculated for various impurity configurations, to investigate the effects of local environment on the electronic structure. Total-energy calculations show that both boron and hydrogen impurities prefer to occupy octahedral interstitial sites that are entirely coordinated by six nickel atoms. Our results suggest that the underlying mechanism of the boron-induced strengthening in Ni3Al is the Ni-d and B-p hybridization between the nearest-neighbor nickel and boron sites. This results in an enhancement of the intraplanar metallic bonding between the nickel atoms, an enhancement of interstitial bonding charge, and reduction of the bonding-charge directionality around the Ni atoms on the (001) NiAl planes. In contrast, hydrogen is found to enhance the bonding-charge directionality near some Ni atoms and to reduce the interstitial charge, suggesting that it promotes poor local cohesion. When both boron and hydrogen are present in Ni3Al, the dominant changes in the electronic structure are induced by boron and the charge distribution resembles that of Ni3Al+B. These results are broadly consistent with the notion of boron as a cohesion enhancer and hydrogen as an embrittler. C1 LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, LIVERMORE, CA 94551 USA. RP CALIF STATE UNIV NORTHRIDGE, DEPT PHYS & ASTRON, NORTHRIDGE, CA 91330 USA. NR 34 TC 48 Z9 50 U1 1 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14421 EP 14430 DI 10.1103/PhysRevB.52.14421 PG 10 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200028 ER PT J AU LYO, SK KURTZ, SR AF LYO, SK KURTZ, SR TI EFFECT OF BAND NONPARABOLICITY ON THE MAGNETOEXCITON BINDING-ENERGY IN SEMICONDUCTORS SO PHYSICAL REVIEW B LA English DT Article AB The effect of conduction- and valence-band nonparabolicity K-e,K-h On the magnetoexciton binding energy is calculated microscopically to the first order in K-e,K-h by converting the Schrodinger equation into a five-point difference equation. The band nonparabolicity is shown to affect the field-induced spectral-line shift from magnetoluminescence significantly. For parabolic bands, an important correction to the reduced mass obtained by a conventional method relying on the high-field exciton-energy shift is discussed. The results yield good agreement with the photoluminescence data from InAs and InAs0.93Sb0.07, providing valuable information about band-nonparabolicity parameters. RP LYO, SK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 2 Z9 2 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14582 EP 14585 DI 10.1103/PhysRevB.52.14582 PG 4 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200047 ER PT J AU JELLISON, GE WITHROW, SP MCCAMY, JW BUDAI, JD LUBBEN, D GODBOLE, MJ AF JELLISON, GE WITHROW, SP MCCAMY, JW BUDAI, JD LUBBEN, D GODBOLE, MJ TI OPTICAL FUNCTIONS OF ION-IMPLANTED, LASER-ANNEALED HEAVILY-DOPED SILICON SO PHYSICAL REVIEW B LA English DT Article ID CONSTANTS AB The optical functions of silcon heavily doped with Ge, P, As, and B are determined using spectroscopic ellipsometry measurements from 240 to 840 nm (5.16 to 1.47 eV). Below the direct band gap, there is a residual enhancement of the optical-adsorption coefficient for silicon heavily doped with n-type dopants, which cannot be explained by surface roughness. In the low-energy region of the observed spectrum, it is found that both free-carrier and strain effects alter the complex dielectric function. RP JELLISON, GE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 24 TC 40 Z9 40 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14607 EP 14614 DI 10.1103/PhysRevB.52.14607 PG 8 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200050 ER PT J AU FRANCESCHETTI, A ZUNGER, Z AF FRANCESCHETTI, A ZUNGER, Z TI QUANTUM-CONFINEMENT-INDUCED GAMMA-]U-CHI TRANSITION IN GAAS/ALGAAS QUANTUM FILMS, WIRES, AND DOTS SO PHYSICAL REVIEW B LA English DT Article ID SHORT-PERIOD SUPERLATTICES; APPROXIMATION AB Large GaAs domains embedded in an AlxGa1-xAs matrix act as potential wells for both electrons and holes, resulting in a direct band-gap system. When the GaAs domains become small, however, quantum-confinement effects may push the Gamma-like conduction-band state localized on GaAs above the X-like conduction-band state of the AlxGa1-x As alloy, leading to an indirect band-gap system. Using a pseudopotential band-structure method, as well as the conventional one-band effective-mass approximation, we investigate the nature of the direct-->indirect (Gamma-->X) transition in GaAs/AlxGa1-xAs quantum films, wires, and dots. In the case of an isolated GaAs quantum structure embedded in AlAs, we find that the critical size for the onset of the Gamma-->X transition increases from similar to 31 A in a two-dimensional film through similar to 56 Angstrom in a one-dimensional cylindrical wire to similar to 80 Angstrom in a zero-dimensional spherical dot. The interaction between GaAs quantum structures tends to reduce the critical size for the Gamma-->X transition. We further study the effect of the alloy composition on the Gamma-->X transition, finding that the critical size decreases when the Ga concentration of the alloy increases. In the case of spherical GaAs quantum dots embedded in an AlxGa1-xAs alloy, we show that, as a function of the dot radius and the alloy composition, different alignments of the band-edge states lead to different regimes of the lowest-energy optical transition. RP FRANCESCHETTI, A (reprint author), NATL RENEWABLE ENERGY RESOURCES,GOLDEN,CO 80401, USA. NR 15 TC 55 Z9 56 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14664 EP 14670 DI 10.1103/PhysRevB.52.14664 PG 7 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200056 ER PT J AU KIM, JN YEH, ML KHAN, FS WILKINS, JW AF KIM, JN YEH, ML KHAN, FS WILKINS, JW TI SURFACE PHONONS OF THE SI(111)-7X7 RECONSTRUCTED SURFACE SO PHYSICAL REVIEW B LA English DT Article ID ABINITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; ELECTRONIC-PROPERTIES; 7X7 SURFACE; SILICON AB We have determined the phonon spectrum of bulk silicon and the Si(111)-7X7 reconstructed surface by performing molecular-dynamics simulations based on the Car-Parrinello fictitious Lagrangian and a tight-binding Hamiltonian. The calculations are performed on parallel distributed memory computers. The phonon-dispersion relation of bulk silicon is obtained from a 128-atom simulation by the fast Fourier transform (FFT) of the ionic velocity data. The vibrational spectrum is reproduced with a resolution of 0.1 THz. Dynamical simulations of the Si(111)-7 X 7 surface consisting of a 400-atom cell are performed over 8 ps and surface phonons are extracted from the ionic velocity-velocity autocorrelation function using the FFT. Localized vibrations on adatoms are found at 15 and 16.3 THz, which we identify as the localized phonons at adatomic sites as observed experimentally by electron-energy-loss (EEL) spectroscopy. We also find surface phonons on the adatomic sites in a lower-frequency range (6-10 THz), which have been previously observed by EEL. We observe a highly symmetrical collective mode of the first-layer atoms at 12.5 THz. This mode involves out-of-phase breathing modes of the two subcells, into which the supercell is divided by the dimer row. Three surface-free atoms in one subcell are incoming while the rest of the atoms are outgoing. C1 OHIO STATE UNIV,DEPT ELECT ENGN,COLUMBUS,OH 43210. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP KIM, JN (reprint author), OHIO STATE UNIV,DEPT PHYS,174 W 18TH AVE,COLUMBUS,OH 43210, USA. NR 32 TC 22 Z9 22 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 NOV 15 PY 1995 VL 52 IS 20 BP 14709 EP 14718 DI 10.1103/PhysRevB.52.14709 PG 10 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200064 ER PT J AU KADUWELA, AP XIAO, H THEVUTHASAN, S FADLEY, CS VANHOVE, MA AF KADUWELA, AP XIAO, H THEVUTHASAN, S FADLEY, CS VANHOVE, MA TI CIRCULAR-DICHROISM IN THE ANGULAR-DISTRIBUTION OF CORE PHOTOELECTRONS FROM SI(001) - A PHOTOELECTRON-DIFFRACTION ANALYSIS SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION FINE-STRUCTURE; POLARIZED X-RAYS; LEVEL PHOTOEMISSION; ULTRATHIN FILMS; SCATTERING; FE/CU(001); NICKEL; EDGES AB Circular dichroism has by now been observed experimentally in the angular distributions of core photoelectrons from both adsorbed molecules and atoms in single-crystal substrates. Photoelectron-diffraction theory provides a general method for predicting and analyzing such effects, as we demonstrate here by applying it to such dichroism in a nonmagnetic single crystal: Si 2s and 2p emission from Si(001), as studied experimentally by Daimon et al. [Jpn. J. Appl. Phys. 32, L1480 (1993)]. Our calculations correctly predict the apparent rotation of certain major diffraction features with right and left circularly polarized light, and also provide a more quantitative approach to analyzing such data than a previously proposed model based upon considerations of forward-scattering effects in photoelectron excitation. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP KADUWELA, AP (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Van Hove, Michel/A-9862-2008; OI Van Hove, Michel/0000-0002-8898-6921; Kaduwela, Ajith/0000-0002-7236-2698 NR 23 TC 27 Z9 27 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14927 EP 14934 DI 10.1103/PhysRevB.52.14927 PG 8 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200089 ER PT J AU BENEDICT, LX CRESPI, VH LOUIE, SG COHEN, ML AF BENEDICT, LX CRESPI, VH LOUIE, SG COHEN, ML TI STATIC CONDUCTIVITY AND SUPERCONDUCTIVITY OF CARBON NANOTUBES - RELATIONS BETWEEN TUBES AND SHEETS SO PHYSICAL REVIEW B LA English DT Article ID GRAPHITE-INTERCALATION COMPOUNDS; ELECTRICAL-CONDUCTIVITY; ELECTRONIC-STRUCTURE; POTASSIUM; MICROTUBULES; TEMPERATURE; C-60 AB We relate the static conductivity of carbon nanotubes to the static in-plane conductivity of a graphite sheet and conclude that isolated single-wall nanotubes are excellent conductors. In contrast, multiwall tubes at low doping may possess conductivities substantially below that of the sum of the constituent tubes. The curvature of small tubes opens new electron-phonon scattering channels that are not available to sheets. This increases the electron-phonon coupling and yields superconducting transition temperatures for small doped tubes intermediate between those of intercalated graphite and alkali-doped C-60. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP BENEDICT, LX (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Crespi, Vincent/0000-0003-3846-3193 NR 27 TC 116 Z9 116 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 NOV 15 PY 1995 VL 52 IS 20 BP 14935 EP 14940 DI 10.1103/PhysRevB.52.14935 PG 6 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200090 ER PT J AU MIYAMOTO, Y COHEN, ML LOUIE, SG AF MIYAMOTO, Y COHEN, ML LOUIE, SG TI AB-INITIO CALCULATION OF PHONON-SPECTRA FOR GRAPHITE, BN, AND BC2N SHEETS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRICAL-CONDUCTIVITY; BC3; MICROTUBULES; MODEL AB Phonon spectra for graphitic sheets of carbon, BN, and BC2N are computed and studied. The dynamical matrices are constructed from force constants obtained by performing supercell Hellmann-Feynman force calculations within the framework of the local-density approximation. The calculated phonon dispersions of the BC2N sheet are found to be similar to a superposition of those of graphite and BN sheets. Geometrical relations between the calculated phonon modes of the BC2N sheet and those of graphite and BN sheets are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NEC CORP LTD,FUNDAMENTAL RES LABS,TSUKUBA,IBARAKI 305,JAPAN. RP MIYAMOTO, Y (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Miyamoto, Yoshiyuki/0000-0001-6834-0499 NR 22 TC 68 Z9 68 U1 0 U2 13 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14971 EP 14975 DI 10.1103/PhysRevB.52.14971 PG 5 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200095 ER PT J AU AHARONY, O SONNENSCHEIN, J PESKIN, ME YANKIELOWICZ, S AF AHARONY, O SONNENSCHEIN, J PESKIN, ME YANKIELOWICZ, S TI EXOTIC NONSUPERSYMMETRIC GAUGE DYNAMICS FROM SUPERSYMMETRIC QCD SO PHYSICAL REVIEW D LA English DT Article ID SYMMETRY-BREAKING; QUANTUM CHROMODYNAMICS; FERMIONS; LATTICE AB we extend Seiberg's qualitative picture cf the behavior of supersymmetric QCD to nonsupersymmetric models by adding soft supersymmetry-breaking terms. In this way we recover the standard vacuum of QCD with N-f flavors and N-c colors when N-f < N-c. However, for N-f greater than or equal to N-c, we find new exotic states-new vacua with spontaneously broken baryon number for N-f = N-c, and a vacuum state with unbroken chiral symmetry for N-f > N-c. These exotic vacua contain massless composite fermions and, in some cases, dynamically generated gauge bosons. In particular Seiberg's electric-magnetic duality seems to persist also in the presence of (small) soft supersymmetry breaking. We argue that certain, specially tailored, lattice simulations may be able to detect the novel phenomena. Most of the exotic behavior does not survive the decoupling Limit of large SUSY-breaking parameters. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. CERN,CH-1211 GENEVA,SWITZERLAND. RP AHARONY, O (reprint author), TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. NR 36 TC 65 Z9 65 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 15 PY 1995 VL 52 IS 10 BP 6157 EP 6174 DI 10.1103/PhysRevD.52.6157 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TF802 UT WOS:A1995TF80200076 ER PT J AU Boller, A Schick, C Wunderlich, B AF Boller, A Schick, C Wunderlich, B TI Modulated differential scanning calorimetry in the glass transition region SO THERMOCHIMICA ACTA LA English DT Article DE ageing; dynamic mechanical analysis; glass transition; hysteresis; MDSC; modulated calorimetry; polystyrene; quasi-isothermal measurement ID HEAT-CAPACITY; MACROMOLECULES AB Modulated differential scanning calorimetry (MDSC) presents two time scales to the measurement of the glass transition, a fast one, fixed by the modulation time period, and a slow one, fixed by the average, underlying heating or cooling rate. The same situation arises in dynamic mechanical and dielectric measurements. The various time effects on the glass transition are discussed and documented with experiments on the reference material polystyrene. It will be shown that MDSC can measure the glass transition temperature largely independent of the thermal history (and the heating or cooling rates), but dependent on the modulation frequency, This distinguishes MDSC from standard calorimetry that can measure accurate data on the glass transition only on cooling, a mode of operation often neither convenient nor very precise. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. UNIV ROSTOCK,FACHBEREICH PHYS,D-18051 ROSTOCK,GERMANY. RP Boller, A (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. RI Schick, Christoph/C-1154-2009 OI Schick, Christoph/0000-0001-6736-5491 NR 43 TC 125 Z9 126 U1 0 U2 25 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD NOV 15 PY 1995 VL 266 BP 97 EP 111 DI 10.1016/0040-6031(95)02552-9 PG 15 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA TL457 UT WOS:A1995TL45700008 ER PT J AU Kwak, BS Zuhr, RA Bates, JB AF Kwak, BS Zuhr, RA Bates, JB TI Deposition of organic-inorganic composite thin films by Li3PO4, sputtering and C2H4, plasma polymerization SO THIN SOLID FILMS LA English DT Article DE deposition process; ethylene; polymers; sputtering AB Organic-inorganic composite macromolecular thin films have been grown by combined r.f.-magnetron sputtering of lithium orthophosphate (Li3PO4) and plasma polymerization of ethylene (C2H4). Of the process gases used, Ar, N-2, Ar/N-2, and Ar/O-2, only the Ar/O-2 mixture provided suitable control over the co-deposition process. The structure and electrical properties of the smooth, pinhole-free films were investigated by X-ray photoelectron spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, Rutherford backscattering spectroscopy, X-ray diffraction, and a.c.-impedance measurement. The inorganic component of the composite films was found to exist both as a separate phase and as a part of the polymeric backbone. The ionic conductivity was found to decrease with the organic content of the film. RP Kwak, BS (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 11 TC 0 Z9 0 U1 1 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 15 PY 1995 VL 269 IS 1-2 BP 6 EP 13 DI 10.1016/0040-6090(95)06654-3 PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TM389 UT WOS:A1995TM38900002 ER PT J AU SPIELMANN, HP CHI, DY HUNT, NG KLEIN, MP HEARST, JE AF SPIELMANN, HP CHI, DY HUNT, NG KLEIN, MP HEARST, JE TI SPIN-LABELED PSORALEN PROBES FOR THE STUDY OF DNA DYNAMICS SO BIOCHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; SYMMETRIC TOP MACROMOLECULES; ESTER BACKBONE FLEXIBILITY; (A)BC EXCINUCLEASE; CIRCULAR-CYLINDERS; CRYSTAL-STRUCTURE; ESCHERICHIA-COLI; BASE DYNAMICS; POLYMERASE-I; CROSS-LINKS AB Six nitroxide spin-labeled psoralen derivatives have been synthesized and evaluated as probes for structural and dynamic studies. Sequence specific photoaddition of these derivatives to DNA oligonucleotides resulted in site-specifically cross-linked and spin-labeled oligomers. Comparison of the general line shape features of the observed electron paramagnetic resonance (EPR) spectra of several duplexes ranging in size from 8 to 46 base pairs with simulated EPR spectra indicate that the nitroxide spin-label probe reports the global tumbling motion of the oligomers. While there is no apparent large amplitude motion of the psoralen other than the overall tumbling of the DNA on the time scales investigated, there are indications of bending and other residual motions. The (A)BC excinuclease DNA repair system detects structural or dynamic features of the DNA that distinguish between damaged and undamaged DNA and are independent of the intrinsic structure of the lesion. NMR studies have shown that psoralen-cross-linked DNA has altered backbone dynamics and conformational populations in the immediate vicinity df the adduct [Emsley et al. (1993) J. Am. Chem. Sec. 115, 7765-7771; Spielmann et al. (1995) Proc. Natl. Acad. Sci. U.S.A. 92, 2345-2349]. We suggested that the signal for recognition of a lesion to be repaired is in the sugar-phosphate backbone and not in the damaged base(s). C1 LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM-14966, GM-41911] NR 70 TC 14 Z9 14 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 14 PY 1995 VL 34 IS 45 BP 14801 EP 14814 DI 10.1021/bi00045a022 PG 14 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TF353 UT WOS:A1995TF35300022 PM 7578089 ER PT J AU KAMBARA, T TANG, JZ AWAYA, Y DEPAOLA, BD JAGUTZKI, O KANAI, Y KIMURA, M KOJIMA, TM MERGEL, V NAKAI, Y SCHMIDTBOCKING, HW SHIMAMURA, I AF KAMBARA, T TANG, JZ AWAYA, Y DEPAOLA, BD JAGUTZKI, O KANAI, Y KIMURA, M KOJIMA, TM MERGEL, V NAKAI, Y SCHMIDTBOCKING, HW SHIMAMURA, I TI 3-DIMENSIONAL RECOIL-ION MOMENTUM ANALYSES IN 8.7 MEV O7+-HE COLLISIONS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID ENERGY-GAIN SPECTROSCOPY; HIGHLY CHARGED IONS; ELECTRON-CAPTURE; NE PROJECTILES; CROSS-SECTIONS; LAMB-SHIFT; HE; STATES; IONIZATION; TARGETS AB Using high-resolution recoil-ion momentum spectroscopy we have measured the differential cross sections of single-electron capture and target single-ionization processes for 8.7 MeV O7+-He collisions as functions of scattering angle. A transverse momentum resolution of +/-0.2 au, which corresponds to an angular resolution of about +/-1.5x10(-6) rad for the projectile scattering angle, was obtained by intersecting a well collimated O7+ beam with a target of a supersonic He jet from a pre-cooled gas and by measuring the recoil-ion transverse momentum. For the single capture reaction, information on the n-value of the electron final state in O6+(1snl) is obtained from the longitudinal momentum of the recoil ions. In pure single-electron capture, the dominant contributions to capture were found to be those from the n = 4 and higher states, whereas single capture accompanied by the ionization of the second target electron mainly populates n = 2 to n = 4 states. Furthermore, the measured transverse momentum distribution differs significantly between pure single capture and capture with simultaneous ionization. The measured data for the pure capture process compare favourably with theoretical results based on a molecular-state expansion method. Other experimental data are discussed in terms of the classical overbarrier model. C1 KANSAS STATE UNIV,DEPT PHYS,MANHATTAN,KS 66506. UNIV FRANKFURT,INST KERNPHYS,FRANKFURT,GERMANY. ARGONNE NATL LAB,ARGONNE,IL. RP KAMBARA, T (reprint author), INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN. RI DePaola, Brett/I-3533-2013; Kanai, Yasuyuki/A-2599-2009 OI DePaola, Brett/0000-0003-3409-671X; NR 39 TC 8 Z9 8 U1 0 U2 1 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 NOV 14 PY 1995 VL 28 IS 21 BP 4593 EP 4606 DI 10.1088/0953-4075/28/21/008 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA TF180 UT WOS:A1995TF18000008 ER PT J AU NELSON, AJ SCHWERDTFEGER, CR OBRIEN, WL AF NELSON, AJ SCHWERDTFEGER, CR OBRIEN, WL TI BAND ALIGNMENT AT THE CDS/CU2IN4SE7 HETEROJUNCTION INTERFACE SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; CUINSE2 AB Band offsets at the CdS/Cu2In4Se7 heterojunction interface were studied by synchrotron radiation soft x-ray photoemission spectroscopy. CdS overlayers were sequentially grown in steps, at room temperature, on the Cu2In4Se7 crystal. Photoemission measurements were acquired after each growth to determine the electronic structure at the heterojunction interface. Results of these measurements indicate that the valence-band offset Delta(vbm) is 1.10(+/-0.20) eV and that the conduction-band offset Delta(cbm) is 0.22(+/-0.20) eV for the CdS/Cu2In4Se7 heterojunction. (C) 1995 American Institute of Physics. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 19 TC 3 Z9 3 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 NOV 13 PY 1995 VL 67 IS 20 BP 2969 EP 2971 DI 10.1063/1.114828 PG 3 WC Physics, Applied SC Physics GA TE385 UT WOS:A1995TE38500024 ER PT J AU SUENAGA, M FUKUMOTO, Y HALDAR, P THURSTON, TR WILDGRUBER, U AF SUENAGA, M FUKUMOTO, Y HALDAR, P THURSTON, TR WILDGRUBER, U TI EFFECTS OF AXIAL TENSILE AND BENDING STRAINS ON CRITICAL CURRENTS OF MONOCORED AND MULTICORED (BI,PB)(2)SR2CA2CU3O10-AG TAPES SO APPLIED PHYSICS LETTERS LA English DT Article AB Improved strain sensitivity of critical currents I-c of the multicored over the monocored (Bi,Pb)(2)Sr2Ca2Cu3O10-Ag tapes is shown for bending strains, but not for axial tensile strains. The improved mechanical tolerance is due, in part, to a better alignment of the Bi-cuprate platelets achieved in the multicored tapes. Furthermore, the difference in the response to these tapes to axial tensile and bending strains is due to the difference in the precise manner in which the strains are applied to the tapes. (C) 1995 American Institute of Physics. C1 INTERMAGNET GEN CORP,LATHAM,NY 12110. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP SUENAGA, M (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 10 TC 42 Z9 43 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 NOV 13 PY 1995 VL 67 IS 20 BP 3025 EP 3027 DI 10.1063/1.114940 PG 3 WC Physics, Applied SC Physics GA TE385 UT WOS:A1995TE38500043 ER PT J AU MAYA, L THUNDAT, T THOMPSON, JR STEVENSON, RJ AF MAYA, L THUNDAT, T THOMPSON, JR STEVENSON, RJ TI LOCALIZED HEATING OF NICKEL NITRIDE ALUMINUM NITRIDE NANOCOMPOSITE FILMS FOR DATA-STORAGE SO APPLIED PHYSICS LETTERS LA English DT Article ID MAGNETIC-PROPERTIES; PARTICLES; COERCIVITY; FE AB Nickel-aluminum nitride films were prepared by reactive sputtering of a nickel aluminide plate in a nitrogen plasma, The initial product is a nanocomposite containing the nickel as the nitride, Ni3N, in aluminum nitride. Heating in vacuum to 500 degrees C causes selective decomposition of the thermally labile nickel nitride leaving the aluminum nitride unaffected, The nickel nanocomposite is of interest for potential applications as recording media, as are other finely divided dispersions of ferromagnetic metals in insulating matrices. The nickel-aluminum nitride nanocomposite shows a moderate coercive field of 35 Oe at 300 K and, in common with ultrafine particles of ferromagnetic materials, shows superparamagnetic behaviour. The Ni3N/AlN nanocomposite was subjected to localized heating with the focused beam of an argon-ion laser; this created features several microns in width that could be imaged with a magnetic force microscope, thus confirming its potential as a high density data storage medium. (C) 1995 American Institute of Physics. C1 OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. TECH DIV,K25 PLANT,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MAYA, L (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 20 TC 17 Z9 17 U1 2 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 13 PY 1995 VL 67 IS 20 BP 3034 EP 3036 DI 10.1063/1.115445 PG 3 WC Physics, Applied SC Physics GA TE385 UT WOS:A1995TE38500046 ER PT J AU BLOCKI, J SKALSKI, J SWIATECKI, WJ AF BLOCKI, J SKALSKI, J SWIATECKI, WJ TI THE EXCITATION OF AN INDEPENDENT-PARTICLE GAS - CLASSICAL OR QUANTAL - BY A TIME-DEPENDENT POTENTIAL WELL SO NUCLEAR PHYSICS A LA English DT Article ID NUCLEAR-DYNAMICS; DISSIPATION; FUSION; CHAOS; RESEPARATION; COALESCENCE; SYSTEMS; FISSION; MODELS; ORDER AB A systematic numerical investigation of the excitation of a classical or quantal gas of non-interacting particles in a time-dependent potential well is described. The excitation energy was followed in time for one oscillation around the sphere for six types of deformation: spheroidal shapes and Legendre polynomial ripples P-2, P-3, P-4, P-5, P-6, with relative rms amplitudes of 0.2. Ten different speeds of deformation and eleven different values of the diffuseness of the potential well were studied, making altogether 660 quantal and 660 classical time-dependent calculations. In the upper range of deformation speeds the quantal results for the non-integrable shapes P-3-P-6 agree approximately with the wall formula for dissipation, the deviations being largely accounted for by the wave-mechanical suppression factor of Koonin et al. For low deformation speeds the dissipation becomes dominated by one or two avoided level crossings. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. NR 36 TC 27 Z9 27 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 NOV 13 PY 1995 VL 594 IS 2 BP 137 EP 155 DI 10.1016/0375-9474(95)00341-W PG 19 WC Physics, Nuclear SC Physics GA TE023 UT WOS:A1995TE02300002 ER PT J AU KNIEHL, BA STEINHAUSER, M AF KNIEHL, BA STEINHAUSER, M TI 3-LOOP O(ALPHA(2)(S)G(F)M(T)(2)) CORRECTIONS TO HIGGS PRODUCTION AND DECAY AT E(+)E(-)-COLLIDERS SO NUCLEAR PHYSICS B LA English DT Article ID FREE GAUGE THEORIES; RADIATIVE-CORRECTIONS; STANDARD MODEL; BOSON; RENORMALIZATION; ORDER AB We evaluate the next-to-leading-order QCD corrections of O(alpha(s)(2)G(F)M(t)(2)) to the Standard-Model l(+)l(-)H, ZZH, and W+W-H couplings in the heavy-top-quark limit. Exploiting these results together with knowledge of Delta rho to the same order, we analyze a variety of production and decay processes of low-mass Higgs bosons at e(+)e(-) colliders. Specifically, we consider H --> l(+)l(-), H --> l(+)l(-)l'(+)l'(-), e(+)e(-) --> ZH, Z --> f (f) over bar H, and e(+)e(-) --> f (f) over bar H, with f = l,v. We work in the electroweak on-shell scheme formulated with G(F) and employ both the on-shell and <(MS)over bar> definitions of the top-quark mass in QCD, As expected, the scheme and scale dependences are greatly reduced when the next-to-leading-order corrections are taken into account, In the on-shell scheme of top-quark mass renormalization, the O(alpha(s)(2)G(F)M(t)(2)) corrections act in the same direction as the O(alpha(s)G(F)M(t)(2)) ones and further increase the screening of the O(G(F)M(t)(2)) terms, The coefficients of (alpha(s)/pi)(2) range from -6.847 for the ZZH coupling to -16.201 for the l(+)l(-)H coupling, This is in line with the value -14.594 recently found for Delta rho. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV KARLSRUHE,INST THEORET TEILCHENPHYS,D-76128 KARLSRUHE,GERMANY. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,D-80805 MUNICH,GERMANY. RP KNIEHL, BA (reprint author), FERMILAB NATL ACCELERATOR LAB,DIV THEORET PHYS,POB 500,BATAVIA,IL 60510, USA. NR 72 TC 30 Z9 30 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD NOV 13 PY 1995 VL 454 IS 3 BP 485 EP 505 DI 10.1016/0550-3213(95)00441-T PG 21 WC Physics, Particles & Fields SC Physics GA TE019 UT WOS:A1995TE01900002 ER PT J AU HAN, T PECCEI, RD ZHANG, X AF HAN, T PECCEI, RD ZHANG, X TI TOP-QUARK DECAY VIA FLAVOR-CHANGING NEUTRAL CURRENTS AT HADRON COLLIDERS SO NUCLEAR PHYSICS B LA English DT Article ID W-GLUON FUSION; STANDARD MODEL; TEVATRON AB We study low energy experimental constraints on an anomalous top-quark coupling associated with the flavor-changing neutral current vertex Z(t) over barc$. In view of these constraints, we discuss the experimental observability of the induced rare decay mode t --> Zc, both at the Fermilab Tevatron (with the Main Injector or a luminosity-upgrade) and at the LHC. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP HAN, T (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. OI Han, Tao/0000-0002-5543-0716 NR 48 TC 111 Z9 112 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 NOV 13 PY 1995 VL 454 IS 3 BP 527 EP 540 DI 10.1016/0550-3213(95)95688-C PG 14 WC Physics, Particles & Fields SC Physics GA TE019 UT WOS:A1995TE01900004 ER PT J AU GODLEY, PF AF GODLEY, PF TI PDC DRILLING BITS SO OIL & GAS JOURNAL LA English DT Letter RP GODLEY, PF (reprint author), US DOE,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0030-1388 J9 OIL GAS J JI Oil Gas J. PD NOV 13 PY 1995 VL 93 IS 46 BP 8 EP & PG 0 WC Energy & Fuels; Engineering, Petroleum SC Energy & Fuels; Engineering GA TE690 UT WOS:A1995TE69000001 ER PT J AU ABE, K ABT, I AHN, CJ AKAGI, T ALLEN, NJ ASH, WW ASTON, D BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BARKLOW, T BAZARKO, AO BENDAVID, R BENVENUTI, AC BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHURCH, E COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYNE, DG DOLIVEIRA, A DAMERELL, CJS DAOUDI, M DESANGRO, R DESIMONE, P DELLORSO, R DIMA, M DU, PYC DUBOIS, R EISENSTEIN, BI ELIA, R FALCIAI, D FAN, C FERO, MJ FREY, R FURUNO, K GILLMAN, T GLADDING, G GONZALEZ, S HALLEWELL, GD HART, EL HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y JACKSON, DJ JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KENDALL, HW KIM, Y KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASSETTI, R MASUDA, H MAZZUCATO, E MCKEMEY, AK MEADOWS, BT MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MULLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OHNISHI, Y OSBORNE, LS PANVINI, RS PARK, H PAVEL, TJ PERUZZI, I PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE ROCHESTER, LS ROTHBERG, JE ROWSON, PC RUSSELL, JJ SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHUMM, BA SEIDEN, A SEN, S SERBO, VV SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SIMOPOULOS, C SINEV, NB SMITH, SR SNYDER, JA STAMER, P STEINER, H STEINER, R STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TORRENCE, E TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, SR WAITE, AP WATTS, SJ WEIDEMANN, AW WEISS, ER WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YANG, X YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHANG, Z ZHOU, J AF ABE, K ABT, I AHN, CJ AKAGI, T ALLEN, NJ ASH, WW ASTON, D BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BARKLOW, T BAZARKO, AO BENDAVID, R BENVENUTI, AC BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHURCH, E COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYNE, DG DOLIVEIRA, A DAMERELL, CJS DAOUDI, M DESANGRO, R DESIMONE, P DELLORSO, R DIMA, M DU, PYC DUBOIS, R EISENSTEIN, BI ELIA, R FALCIAI, D FAN, C FERO, MJ FREY, R FURUNO, K GILLMAN, T GLADDING, G GONZALEZ, S HALLEWELL, GD HART, EL HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y JACKSON, DJ JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KENDALL, HW KIM, Y KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASSETTI, R MASUDA, H MAZZUCATO, E MCKEMEY, AK MEADOWS, BT MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MULLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OHNISHI, Y OSBORNE, LS PANVINI, RS PARK, H PAVEL, TJ PERUZZI, I PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE ROCHESTER, LS ROTHBERG, JE ROWSON, PC RUSSELL, JJ SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHUMM, BA SEIDEN, A SEN, S SERBO, VV SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SIMOPOULOS, C SINEV, NB SMITH, SR SNYDER, JA STAMER, P STEINER, H STEINER, R STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TORRENCE, E TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, SR WAITE, AP WATTS, SJ WEIDEMANN, AW WEISS, ER WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YANG, X YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHANG, Z ZHOU, J TI MEASUREMENT OF THE LEFT-RIGHT FORWARD-BACKWARD ASYMMETRY FOR CHARM QUARKS WITH D-ASTERISK+ AND D+ MESONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present a direct measurement of A(c) = 2 upsilon(c)a(c)/(upsilon(c)(2) + a(c)(2)) from the left-right forward-backward asymmetry of D*(+) and D+ mesons in Z(0) events produced with the longitudinally polarized SLAG Linear Collider beam. These Z(0) --> events are tagged on the basis of event kinematics and decay topology from a sample of hadronic Z(0) decays recorded by the SLAG Large Detector. We measure A(c)(0) = 0.73 +/- 0.22(stat) +/- 0.10(syst). C1 IST NAZL FIS NUCL,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY. BOSTON UNIV,BOSTON,MA 02215. BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND. CALTECH,PASADENA,CA 91125. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV CINCINNATI,CINCINNATI,OH 45221. COLORADO STATE UNIV,FT COLLINS,CO 80523. UNIV COLORADO,BOULDER,CO 80309. COLUMBIA UNIV,NEW YORK,NY 10027. IST NAZL FIS NUCL,SEZ FERRARA,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MASSACHUSETTS,AMHERST,MA 01003. UNIV MISSISSIPPI,UNIVERSITY,MS 38677. NAGOYA UNIV,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. UNIV OREGON,EUGENE,OR 97403. IST NAZL FIS NUCL,SEZ PADOVA,I-35100 PADUA,ITALY. UNIV PADUA,I-35100 PADUA,ITALY. IST NAZL FIS NUCL,SEZ PERUGIA,I-06100 PERUGIA,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. IST NAZL FIS NUCL,SEZ PISA,I-56100 PISA,ITALY. UNIV PISA,I-56100 PISA,ITALY. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. SOGANG UNIV,SEOUL,SOUTH KOREA. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV TENNESSEE,KNOXVILLE,TN 37996. TOHOKU UNIV,SENDAI,MIYAGI 980,JAPAN. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, K (reprint author), ADELPHI UNIV,GARDEN CITY,NY 11530, USA. RI de Sangro, Riccardo/J-2901-2012; de Simone, Patrizia/J-3549-2012; Cavalli-Sforza, Matteo/H-7102-2015; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016 OI de Sangro, Riccardo/0000-0002-3808-5455; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636 NR 22 TC 9 Z9 9 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3609 EP 3613 DI 10.1103/PhysRevLett.75.3609 PG 5 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300006 ER PT J AU ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALITTI, J ALVAREZ, G ALVES, GA AMIDI, E AMOS, N ANDERSON, EW ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BENDICH, J BERI, SB BERTRAM, I BEZZUBOV, VA BHAT, PC BHATNAGAR, V BHATTACHARJEE, M BISCHOFF, A BISWAS, N BLAZEY, G BLESSING, S BLOOM, P BOEHNLEIN, A BOJKO, NI BORCHERDING, F BORDERS, J BOSWELL, C BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, VS BUTLER, JM CASEY, D CASTILLAVALDEZ, H CHAKRABORTY, D CHANG, SM CHEKULAEV, SV CHEN, LP CHEN, W CHEVALIER, L CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, MAC CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, SP DHARMARATNA, W DIEHL, HT DIESBURG, M DILORETO, G DIXON, R DRAPER, P DRINKARD, J DUCROS, Y DUGAD, SR DURSTONJOHNSON, S EDMUNDS, D ELLISON, J ELVIRA, VD ENGELMANN, R ENO, S EPPLEY, G ERMOLOV, P EROSHIN, OV EVDOKIMOV, VN FAHEY, S FAHLAND, T FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FISYAK, Y FLATTUM, E FORDEN, GE FORTNER, M FRAME, KC FRANZINI, P FUESS, S GALJAEV, AN GALLAS, E GAO, CS GAO, S GELD, TL GENIK, RJ GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLENN, S GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GONCHAROV, PI GORDON, H GOSS, LT GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GRIFFIN, G GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GU, W GUGLIELMO, G GUIDA, JA GUIDA, JM GURYN, W GURZHIEV, SN GUTIERREZ, P GUTNIKOV, YE HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HAHN, KS HALL, RE HANSEN, S HATCHER, R HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERNANDEZMONTOYA, R HEURING, T HIROSKY, R HOBBS, JD HOENEISEN, B HOFTUN, JS HSIEH, F HU, T HU, T HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JERGER, SA JIANG, JZY JOFFEMINOR, T JOHARI, H JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUN, SY JUNG, CK KAHN, S KALBFLEISCH, G KANG, JS KEHOE, R KELLY, ML KERNAN, A KERTH, L KIM, CL KIM, SK KLATCHKO, A KLIMA, B KLOCHKOV, BI KLOPFENSTEIN, C KLYUKHIN, VI KOCHETKOV, VI KOHLI, JM KOLTICK, D KOSTRITSKIY, AV KOTCHER, J KOURLAS, J KOZELOV, AV KOZLOVSKI, EA KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEBRAT, JF LEFLAT, A LI, H LI, J LI, YK LIDEMARTEAU, QZ LIMA, JGR LINCOLN, D LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANDRICHENKO, IV MANGEOT, P MANI, S MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, MI MARX, M MAY, B MAYOROV, AA MCCARTHY, R MCKIBBEN, T MCKINLEY, J MCMAHON, T MELANSON, HL DEMELLONETO, JRT MERRITT, KW MIETTINEN, H MILDER, A MINCER, A DEMIRANDA, JM MISHRA, CS MOHAMMADIBAARMAND, M MOKHOV, N MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NARAYANAN, A NEAL, HA NEGRET, JP NEIS, E NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PADLEY, P PANG, M PARA, A PARK, CH PARK, YM PARTRIDGE, R PARUA, N PATERNO, M PERKINS, J PERYSHKIN, A PETERS, M PIEKARZ, H PISCHALNIKOV, Y PLUQUET, A PODSTAVKOV, VM POPE, BG PROSPER, HB PROTOPOPESCU, S PUSELJIC, D QIAN, J QUINTAS, PZ RAJA, R RAJAGOPALAN, S RAMIREZ, O RAO, MVS RAPIDIS, PA RASMUSSEN, L READ, AL REUCROFT, S RIJSSENBEEK, M ROCKWELL, T ROE, NA RUBINOV, P RUCHTI, R RUSIN, S RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHELLMAN, H SCULLI, J SHABALINA, E SHAFFER, C SHANKAR, HC SHIVPURI, RK SHUPE, M SINGH, JB SIROTENKO, V SMART, W SMITH, A SMITH, RP SNIHUR, R SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, RW STEVENSON, ML STEWART, D STOIANOVA, DA STOKER, D STREETS, K STROVINK, M TAKETANI, A TAMBURELLO, P TARAZI, J TARTAGLIA, M TAYLOR, TL TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VARELAS, N VARNES, EW VIRADOR, PRG VITITOE, D VOLKOV, AA VOROBIEV, AP WAHL, HD WANG, G WANG, J WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WEN, F WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WIRJAWAN, JVD WOMERSLEY, J WON, E WOOD, DR XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J YU, Y ZHANG, Y ZHOU, YH ZHU, Q ZHU, YS ZHU, ZH ZIEMINSKA, D ZIEMINSKI, A ZYLBERSTEJN, A AF ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALITTI, J ALVAREZ, G ALVES, GA AMIDI, E AMOS, N ANDERSON, EW ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BENDICH, J BERI, SB BERTRAM, I BEZZUBOV, VA BHAT, PC BHATNAGAR, V BHATTACHARJEE, M BISCHOFF, A BISWAS, N BLAZEY, G BLESSING, S BLOOM, P BOEHNLEIN, A BOJKO, NI BORCHERDING, F BORDERS, J BOSWELL, C BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, VS BUTLER, JM CASEY, D CASTILLAVALDEZ, H CHAKRABORTY, D CHANG, SM CHEKULAEV, SV CHEN, LP CHEN, W CHEVALIER, L CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, MAC CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, SP DHARMARATNA, W DIEHL, HT DIESBURG, M DILORETO, G DIXON, R DRAPER, P DRINKARD, J DUCROS, Y DUGAD, SR DURSTONJOHNSON, S EDMUNDS, D ELLISON, J ELVIRA, VD ENGELMANN, R ENO, S EPPLEY, G ERMOLOV, P EROSHIN, OV EVDOKIMOV, VN FAHEY, S FAHLAND, T FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FISYAK, Y FLATTUM, E FORDEN, GE FORTNER, M FRAME, KC FRANZINI, P FUESS, S GALJAEV, AN GALLAS, E GAO, CS GAO, S GELD, TL GENIK, RJ GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLENN, S GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GONCHAROV, PI GORDON, H GOSS, LT GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GRIFFIN, G GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GU, W GUGLIELMO, G GUIDA, JA GUIDA, JM GURYN, W GURZHIEV, SN GUTIERREZ, P GUTNIKOV, YE HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HAHN, KS HALL, RE HANSEN, S HATCHER, R HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERNANDEZMONTOYA, R HEURING, T HIROSKY, R HOBBS, JD HOENEISEN, B HOFTUN, JS HSIEH, F HU, T HU, T HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JERGER, SA JIANG, JZY JOFFEMINOR, T JOHARI, H JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUN, SY JUNG, CK KAHN, S KALBFLEISCH, G KANG, JS KEHOE, R KELLY, ML KERNAN, A KERTH, L KIM, CL KIM, SK KLATCHKO, A KLIMA, B KLOCHKOV, BI KLOPFENSTEIN, C KLYUKHIN, VI KOCHETKOV, VI KOHLI, JM KOLTICK, D KOSTRITSKIY, AV KOTCHER, J KOURLAS, J KOZELOV, AV KOZLOVSKI, EA KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEBRAT, JF LEFLAT, A LI, H LI, J LI, YK LIDEMARTEAU, QZ LIMA, JGR LINCOLN, D LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANDRICHENKO, IV MANGEOT, P MANI, S MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, MI MARX, M MAY, B MAYOROV, AA MCCARTHY, R MCKIBBEN, T MCKINLEY, J MCMAHON, T MELANSON, HL DEMELLONETO, JRT MERRITT, KW MIETTINEN, H MILDER, A MINCER, A DEMIRANDA, JM MISHRA, CS MOHAMMADIBAARMAND, M MOKHOV, N MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NARAYANAN, A NEAL, HA NEGRET, JP NEIS, E NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PADLEY, P PANG, M PARA, A PARK, CH PARK, YM PARTRIDGE, R PARUA, N PATERNO, M PERKINS, J PERYSHKIN, A PETERS, M PIEKARZ, H PISCHALNIKOV, Y PLUQUET, A PODSTAVKOV, VM POPE, BG PROSPER, HB PROTOPOPESCU, S PUSELJIC, D QIAN, J QUINTAS, PZ RAJA, R RAJAGOPALAN, S RAMIREZ, O RAO, MVS RAPIDIS, PA RASMUSSEN, L READ, AL REUCROFT, S RIJSSENBEEK, M ROCKWELL, T ROE, NA RUBINOV, P RUCHTI, R RUSIN, S RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHELLMAN, H SCULLI, J SHABALINA, E SHAFFER, C SHANKAR, HC SHIVPURI, RK SHUPE, M SINGH, JB SIROTENKO, V SMART, W SMITH, A SMITH, RP SNIHUR, R SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, RW STEVENSON, ML STEWART, D STOIANOVA, DA STOKER, D STREETS, K STROVINK, M TAKETANI, A TAMBURELLO, P TARAZI, J TARTAGLIA, M TAYLOR, TL TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VARELAS, N VARNES, EW VIRADOR, PRG VITITOE, D VOLKOV, AA VOROBIEV, AP WAHL, HD WANG, G WANG, J WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WEN, F WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WIRJAWAN, JVD WOMERSLEY, J WON, E WOOD, DR XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J YU, Y ZHANG, Y ZHOU, YH ZHU, Q ZHU, YS ZHU, ZH ZIEMINSKA, D ZIEMINSKI, A ZYLBERSTEJN, A TI 2ND GENERATION LEPTOQUARK SEARCH IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8-TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRON COLLIDERS; SCALAR LEPTOQUARKS; Z0 DECAYS; PARTICLES; DETECTOR AB We report on a search for second generation scalar leptoquarks with the DO detector at the Fermilab Tevatron collider at root s = 1.8 TeV. This search is based on 12.7 pb(-1) of data. Second generation leptoquarks are assumed to be produced in pairs and to decay into a muon and quark with branching ratio beta or into a neutrino and quark with branching ratio 1 - beta. We obtain cross section times branching ratio limits as a function of leptoquark mass and set lower limits on the leptoquark mass at the 95% confidence level. C1 UNIV ARIZONA,TUCSON,AZ 85721. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF IRVINE,IRVINE,CA 92717. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,RIO JANEIRO,BRAZIL. CTR INVEST & ESTUDIOS AVANZADOS,MEXICO CITY,DF,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV DELHI,DELHI 110007,INDIA. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHICAGO,IL 60607. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. KOREA UNIV,SEOUL 136701,SOUTH KOREA. KYUNGSUNG UNIV,PUSAN,SOUTH KOREA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,COLLEGE PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW,RUSSIA. UNIV NEBRASKA,LINCOLN,NE 68588. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV OKLAHOMA,NORMAN,OK 73019. PANJAB UNIV,CHANDIGARH 160014,INDIA. PROTVINO HIGH ENERGY PHYS INST,PROTVINO 142284,RUSSIA. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77251. UNIV ROCHESTER,ROCHESTER,NY 14627. CENS,CEA,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE. SEOUL NATL UNIV,SEOUL 151,SOUTH KOREA. SUNY STONY BROOK,STONY BROOK,NY 11794. SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. TATA INST FUNDAMENTAL RES,BOMBAY 400005,MAHARASHTRA,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV LOS ANDES,BOGOTA,COLOMBIA. RP ABACHI, S (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Taketani, Atsushi/E-1803-2017; Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Leflat, Alexander/D-7284-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; de Mello Neto, Joao/C-5822-2013 OI Taketani, Atsushi/0000-0002-4776-2315; Aihara, Hiroaki/0000-0002-1907-5964; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Kim, Sun Kee/0000-0002-0013-0775; de Mello Neto, Joao/0000-0002-3234-6634 NR 25 TC 24 Z9 24 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3618 EP 3623 DI 10.1103/PhysRevLett.75.3618 PG 6 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300008 ER PT J AU ABE, K ABT, I AHN, CJ AKAGI, T ALLEN, NJ ASH, WW ASTON, D BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BARKLOW, T BAZARKO, AO BENDAVID, R BENVENUTI, AC BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHURCH, E COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYNE, DG DOLIVEIRA, A DAMERELL, CJS DAOUDI, M DESANGRO, R DESIMONE, P DELLORSO, R DIMA, M DU, PYC DUBOIS, R EISENSTEIN, B ELIA, R FALCIAI, D FAN, C FERO, MJ FREY, R FURUNO, K GILLMAN, T GLADDING, G GONZALEZ, S HALLEWELL, GD HART, EL HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y JACKSON, DJ JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KANG, HJ KARLINER, I KAWAHARA, H KENDALL, HW KIM, Y KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWGS LIU, MX LIU, X LORETI, M LU, A LYNCH, HL MA, J MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASSETTI, R MASUDA, H MAZZUCATO, E MCKEMEY, AK MEADOWS, BT MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MIILLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OHNISHI, Y OSBORNE, LS PANVINI, RS PARK, H PAVE, TJ PERUZZI, I PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW REIDY, J RENSING, PE ROCHESTER, LS ROTHBERG, JE ROWSON, PC RUSSE, JJ SAXTON, OH SCHAFFNER, SF SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHUMM, BA SEIDEN, A SEN, S SERBO, VV SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SHMAKOV, KD SIMOPOULOS, C SINEV, NB SMITH, SR SNYDER, JA STAMER, P STEINER, H STEINER, R STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TORRENCE, E TRANDAFIR, AI TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, SR WAITE, AP WATTS, SJ WEIDEMANN, AW WEISS, ER WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YANG, X YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHANG, Z ZHOU, J AF ABE, K ABT, I AHN, CJ AKAGI, T ALLEN, NJ ASH, WW ASTON, D BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BARKLOW, T BAZARKO, AO BENDAVID, R BENVENUTI, AC BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHURCH, E COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYNE, DG DOLIVEIRA, A DAMERELL, CJS DAOUDI, M DESANGRO, R DESIMONE, P DELLORSO, R DIMA, M DU, PYC DUBOIS, R EISENSTEIN, B ELIA, R FALCIAI, D FAN, C FERO, MJ FREY, R FURUNO, K GILLMAN, T GLADDING, G GONZALEZ, S HALLEWELL, GD HART, EL HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y JACKSON, DJ JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KANG, HJ KARLINER, I KAWAHARA, H KENDALL, HW KIM, Y KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWGS LIU, MX LIU, X LORETI, M LU, A LYNCH, HL MA, J MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASSETTI, R MASUDA, H MAZZUCATO, E MCKEMEY, AK MEADOWS, BT MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MIILLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OHNISHI, Y OSBORNE, LS PANVINI, RS PARK, H PAVE, TJ PERUZZI, I PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW REIDY, J RENSING, PE ROCHESTER, LS ROTHBERG, JE ROWSON, PC RUSSE, JJ SAXTON, OH SCHAFFNER, SF SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHUMM, BA SEIDEN, A SEN, S SERBO, VV SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SHMAKOV, KD SIMOPOULOS, C SINEV, NB SMITH, SR SNYDER, JA STAMER, P STEINER, H STEINER, R STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TORRENCE, E TRANDAFIR, AI TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, SR WAITE, AP WATTS, SJ WEIDEMANN, AW WEISS, ER WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YANG, X YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHANG, Z ZHOU, J TI MEASUREMENT OF THE AVERAGE B-HADRON LIFETIME IN Z(0) DECAYS USING RECONSTRUCTED VERTICES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MESONS AB We report a measurement of the average B hadron lifetime using data collected with the SLD detector at the SLAG Linear Collider in 1993. An inclusive analysis selected three-dimensional vertices with B hadron lifetime information in a sample of 50 x 10(3) Z(0) decays. A lifetime of 1.564 +/- 0.030(stat) +/- 0.036(syst) ps was extracted from the decay length distribution of these vertices using a binned maximum likelihood method. C1 IST NAZL FIS NUCL,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY. BOSTON UNIV,BOSTON,MA 02215. BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND. CALTECH,PASADENA,CA 91125. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV CINCINNATI,CINCINNATI,OH 45221. COLORADO STATE UNIV,FT COLLINS,CO 80523. UNIV COLORADO,BOULDER,CO 80309. COLUMBIA UNIV,NEW YORK,NY 10027. IST NAZL FIS NUCL,SEZ FERRARA,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MISSISSIPPI,UNIVERSITY,MS 38677. NAGOYA UNIV,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. UNIV OREGON,EUGENE,OR 97403. IST NAZL FIS NUCL,SEZ PADOVA,I-35100 PADUA,ITALY. UNIV PADUA,I-35100 PADUA,ITALY. IST NAZL FIS NUCL,SEZ PERUGIA,I-06100 PERUGIA,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. IST NAZL FIS NUCL,SEZ PISA,I-56100 PISA,ITALY. UNIV PISA,I-56100 PISA,ITALY. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. SOGANG UNIV,SEOUL,SOUTH KOREA. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV TENNESSEE,KNOXVILLE,TN 37996. TOHOKU UNIV,SENDAI,MIYAGI 980,JAPAN. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, K (reprint author), ADELPHI UNIV,GARDEN CITY,NY 11530, USA. RI Schaffner, Stephen/D-1189-2011; de Sangro, Riccardo/J-2901-2012; de Simone, Patrizia/J-3549-2012; Cavalli-Sforza, Matteo/H-7102-2015; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; OI de Sangro, Riccardo/0000-0002-3808-5455; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; pieroni, enrico/0000-0002-4246-6963; Wyss, Jeffery/0000-0002-8277-4012; Wilson, Robert/0000-0002-8184-4103 NR 26 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 NOV 13 PY 1995 VL 75 IS 20 BP 3624 EP 3628 DI 10.1103/PhysRevLett.75.3624 PG 5 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300009 ER PT J AU BEAVIS, D BENNETT, MJ CARROLL, JB CHIBA, J CHIKANIAN, A CRAWFORD, H CRONQVIST, M DARDENNE, Y DEBBE, R DOKE, T ENGELAGE, J GREINER, L HALLMAN, TJ HAYANO, RS HECKMAN, HH KASHIWAGI, T KIKUCHI, J KUMAR, S KUO, C LINDSTROM, PJ MITCHELL, JW NAGAMIYA, S NAGLE, JL POPE, JK STANKUS, P TANAKA, KH WELSH, RC ZHAN, W AF BEAVIS, D BENNETT, MJ CARROLL, JB CHIBA, J CHIKANIAN, A CRAWFORD, H CRONQVIST, M DARDENNE, Y DEBBE, R DOKE, T ENGELAGE, J GREINER, L HALLMAN, TJ HAYANO, RS HECKMAN, HH KASHIWAGI, T KIKUCHI, J KUMAR, S KUO, C LINDSTROM, PJ MITCHELL, JW NAGAMIYA, S NAGLE, JL POPE, JK STANKUS, P TANAKA, KH WELSH, RC ZHAN, W TI CENTRALITY DEPENDENCE OF ANTIPROTON PRODUCTION IN AU+AU COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; NUCLEUS COLLISIONS; PARTICLES; GEV/C; SI AB We have measured the yields of antiprotons in Au + Au interactions in the rapidity range 1.2 < y < 2.8 as a function of centrality using a beam line spectrometer. The shapes of the invariant multiplicity distributions at p(t) = 0 are used to explore the dynamics of antiproton production and annihilation. C1 YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 305,JAPAN. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. WASEDA UNIV,TOKYO 160,JAPAN. UNIV TOKYO,TOKYO 113,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE SCI RES ASSOC,GREENBELT,MD 20771. COLUMBIA UNIV,NEVIS LAB,IRVINGTON,NY. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP BEAVIS, D (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Hayano, Ryugo/F-7889-2012; Kuo, Chaincy/H-9475-2016 OI Hayano, Ryugo/0000-0002-1214-7806; Kuo, Chaincy/0000-0001-7958-8764 NR 28 TC 23 Z9 23 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3633 EP 3636 DI 10.1103/PhysRevLett.75.3633 PG 4 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300011 ER PT J AU MARINAK, MM REMINGTON, BA WEBER, SV TIPTON, RE HAAN, SW BUDIL, KS LANDEN, OL KILKENNY, JD WALLACE, R AF MARINAK, MM REMINGTON, BA WEBER, SV TIPTON, RE HAAN, SW BUDIL, KS LANDEN, OL KILKENNY, JD WALLACE, R TI 3-DIMENSIONAL SINGLE-MODE RAYLEIGH-TAYLOR EXPERIMENTS ON NOVA SO PHYSICAL REVIEW LETTERS LA English DT Article ID LARGE GROWTH; INSTABILITY; LASER; FUSION AB The effect of perturbation shape on the growth and saturation of the Rayleigh-Taylor (RT) instability has been measured on brominated polystyrene foils driven by x rays. We compare RT growth of 3D square (k(x) = k(y)) and 2D (k = k(x)) perturbations having the same total wave number and initial amplitude on foils of similar thicknesses accelerated with similar drives. The 3D mode is found to saturate later at a larger amplitude. During the nonlinear phase it evolves into narrow spikes joined by spike sheets surrounding wide bubbles, which continue to broaden. Differences in the evolution of the perturbations due to 3D shape effects are in quantitative agreement with our simulation results. RP MARINAK, MM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 32 TC 57 Z9 60 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3677 EP 3680 DI 10.1103/PhysRevLett.75.3677 PG 4 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300022 ER PT J AU SYNAKOWSKI, EJ BELL, RE BUDNY, RV BUSH, CE EFTHIMION, PC GREK, B JOHNSON, DW JOHNSON, LC LEBLANC, B PARK, H RAMSEY, AT TAYLOR, G AF SYNAKOWSKI, EJ BELL, RE BUDNY, RV BUSH, CE EFTHIMION, PC GREK, B JOHNSON, DW JOHNSON, LC LEBLANC, B PARK, H RAMSEY, AT TAYLOR, G TI MEASUREMENTS OF THE PRODUCTION AND TRANSPORT OF HELIUM ASH IN THE TFTR TOKAMAK SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTICLE-TRANSPORT; EXHAUST; SIMULATIONS; REACTOR; LIMITER; PLASMAS; TEXTOR; JT-60 AB Helium ash production and transport have been measured in TFTR deuterium-tritium plasmas using charge-exchange recombination spectroscopy. The helium ash confinement time, including recycling effects, is 6-10 times the energy confinement time and is compatible with sustained ignition in a reactor. The ash confinement time is dominated by edge pumping rates rather than core transport. The measured evolution of the local thermal ash density is consistent with modeling based on previously measured helium transport coefficients and classical slowing down of the alpha particles. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP SYNAKOWSKI, EJ (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 28 TC 37 Z9 37 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3689 EP 3692 DI 10.1103/PhysRevLett.75.3689 PG 4 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300025 ER PT J AU PERL, ML AF PERL, ML TI HOT PAPERS - PHYSICS - EVIDENCE FOR ANOMALOUS LEPTON PRODUCTION IN E(+)-E(-) ANNIHILATION - BY PERL,M.L. ET-AL - COMMENTS SO SCIENTIST LA English DT Editorial Material ID TAU AB In a special Nobel Citation Classic tribute, physicist Martin L. Perl discusses his prize-winning research on leptons. RP PERL, ML (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD NOV 13 PY 1995 VL 9 IS 22 BP 16 EP 16 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA TD483 UT WOS:A1995TD48300014 ER PT J AU HAN, SW HU, LD LIU, NZ MAO, HS SHI, HZ TAN, YP WANG, GL ZHANG, CD ZHANG, G ZHANG, LS ZHANG, ZX ZHAO, XJ ZHENG, LS ZHONG, XC ZHOU, YS BYONWAGNER, A GREEN, D PARA, A JOHNSON, K BARNES, V AF HAN, SW HU, LD LIU, NZ MAO, HS SHI, HZ TAN, YP WANG, GL ZHANG, CD ZHANG, G ZHANG, LS ZHANG, ZX ZHAO, XJ ZHENG, LS ZHONG, XC ZHOU, YS BYONWAGNER, A GREEN, D PARA, A JOHNSON, K BARNES, V TI RADIATION HARDNESS TESTS OF SCINTILLATING TILE WLS FIBER CALORIMETER MODULES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The radiation hardness properties of a tile/fiber calorimeter with different materials or with different optical path layouts have been studied. Ten calorimeter modules of a geometry similar to that of the proposed SDC calorimeter were irradiated using the BEPC electron beam (1.1 or 1.3 GeV). Radiation damage was quantified by measuring the light yield at various locations within the calorimeter modules at different integrated doses. The recovery process and the dependence on the ambient atmosphere were also studied and correction techniques for various dose and depth profiles were developed. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. PURDUE UNIV,W LAFAYETTE,IN 47907. NR 10 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1995 VL 365 IS 2-3 BP 337 EP 351 DI 10.1016/0168-9002(95)00429-7 PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TF304 UT WOS:A1995TF30400010 ER PT J AU HAILEY, CJ HARRISON, FA AF HAILEY, CJ HARRISON, FA TI A NEW CONCEPT FOR BACKGROUND REJECTION IN GAMMA-RAY ASTRONOMY - THE SUPERSHIELD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID BORNE AB Expanding the scientific successes of GRO and SIGMA will require significant improvements in sensitivity for the next generation of gamma-ray instruments. The conventional approach of increasing detector areas and shield thicknesses will reach a practical limit with the current generation of instruments, especially as moderate-sized launch vehicles will certainly be the norm in the future. Further sensitivity improvements require novel approaches for reducing detector background. Here we describe some concepts for advanced shielding configurations which we call ''supershields''. Supershields combine layers of materials designed to moderate and absorb neutrons, along with conventional, active gamma-ray shields. Due to contradictory demands placed on shield designs by neutrons and gamma-rays, supershields afford significant flexibility to optimize shield geometry compared to conventional shielding methods. If properly designed, supershields have the potential to significantly reduce overall detector backgrounds using passive, inexpensive materials. C1 CALTECH,PASADENA,CA 91125. RP HAILEY, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,POB 808,LIVERMORE,CA 94550, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1995 VL 365 IS 2-3 BP 518 EP 523 DI 10.1016/0168-9002(95)00463-7 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TF304 UT WOS:A1995TF30400029 ER PT J AU POLICARPO, APL CHEPEL, V LOPES, MI PESKOV, V GELTENBORT, P MARQUES, RF ARAUJO, H FRAGA, F ALVES, MA FONTE, P LIMA, EP FRAGA, MM LEITE, MS SILANDER, K ONOFRE, A PINHAO, JM AF POLICARPO, APL CHEPEL, V LOPES, MI PESKOV, V GELTENBORT, P MARQUES, RF ARAUJO, H FRAGA, F ALVES, MA FONTE, P LIMA, EP FRAGA, MM LEITE, MS SILANDER, K ONOFRE, A PINHAO, JM TI OBSERVATION OF ELECTRON MULTIPLICATION IN LIQUID XENON WITH A MICROSTRIP PLATE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter AB We report here on the observation of electron multiplication in liquid xenon in a microstrip chamber with an amplification factor of the order of 10. The measurements were carried out at a temperature between 208 and 215 K (liquid density of about 2.7 g/cm(3)). C1 UNIV COIMBRA,DEPT FIS,P-3000 COIMBRA,PORTUGAL. FERMI LAB,BATAVIA,IL 60510. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RP POLICARPO, APL (reprint author), UNIV COIMBRA,LIP COIMBRA,P-3000 COIMBRA,PORTUGAL. RI Lopes, Isabel/A-1806-2014; Fonte, Paulo/B-1842-2008; OI Lopes, Isabel/0000-0003-0419-903X; Araujo, Henrique/0000-0002-5972-2783; Marques, Rui/0000-0003-3549-8198; Fonte, Paulo/0000-0002-2275-9099; Fraga, Margarida/0000-0003-4981-5684; Fraga, Francisco/0000-0002-7028-2651; Chepel, Vitaly/0000-0003-0675-4586 NR 13 TC 19 Z9 19 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1995 VL 365 IS 2-3 BP 568 EP 571 DI 10.1016/0168-9002(95)00457-2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TF304 UT WOS:A1995TF30400036 ER PT J AU GRATCHEV, V MOHAMMADIBAARMAND, M POLYCHRONAKOS, V SHANK, J TCHERNIATINE, V VANIACHINE, A AF GRATCHEV, V MOHAMMADIBAARMAND, M POLYCHRONAKOS, V SHANK, J TCHERNIATINE, V VANIACHINE, A TI DOUBLE TRACK RESOLUTION OF CATHODE STRIP CHAMBERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter AB Details are presented of a method to resolve close tracks in cathode strip chambers based on the fit to the induced charge distribution. The analysis of muon beam test data demonstrated a double track resolution of about 2 mm for a readout pitch of 5 mm. The degradation of the position resolution in the presence of a dose track is limited to 10% of the readout pitch. C1 ROYAL INST TECHNOL,DEPT PHYS,S-10405 STOCKHOLM,SWEDEN. BROOKHAVEN NATL LAB,UPTON,NY 11973. SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. RI Vanyashin, Aleksandr/H-7796-2013 OI Vanyashin, Aleksandr/0000-0002-0367-5666 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1995 VL 365 IS 2-3 BP 576 EP 581 DI 10.1016/0168-9002(95)00670-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TF304 UT WOS:A1995TF30400038 ER PT J AU URBAN, W JONES, MA PEARSON, CJ AHMAD, I BENTALEB, M DURELL, JL LEDDY, MJ LUBKIEWICZ, E MORSS, LR PHILLIPS, WR SCHULZ, N SMITH, AG VARLEY, BJ AF URBAN, W JONES, MA PEARSON, CJ AHMAD, I BENTALEB, M DURELL, JL LEDDY, MJ LUBKIEWICZ, E MORSS, LR PHILLIPS, WR SCHULZ, N SMITH, AG VARLEY, BJ TI TRIPLE ANGULAR-CORRELATIONS OF GAMMA-RAYS FOLLOWING SPONTANEOUS FISSION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter ID OCTUPOLE AB Triple angular correlations between gamma rays following spontaneous fission of Cm-248 are studied using the EUROGAM array. Results, for transitions in even-even fission-product nuclei, agree with predictions of angular correlation theory. Efficient detector systems combined with new analysis techniques offer for the first time a convenient tool to determine multipolarities of prompt gamma transitions in the fission-product nuclei. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV STRASBOURG 1,CNR,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. RP URBAN, W (reprint author), UNIV MANCHESTER,DEPT PHYS & ASTRON,MANCHESTER M13 9PL,LANCS,ENGLAND. NR 8 TC 34 Z9 34 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1995 VL 365 IS 2-3 BP 596 EP 599 DI 10.1016/0168-9002(95)00594-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TF304 UT WOS:A1995TF30400043 ER PT J AU KINNEL, TS SANDLER, PH SMITH, WH ARROYO, C BACHMANN, KT BAZARKO, AO BOLTON, T FOUDAS, C KING, BJ LEFMANN, WC LEUNG, WC MISHRA, SR OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, FO FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK AF KINNEL, TS SANDLER, PH SMITH, WH ARROYO, C BACHMANN, KT BAZARKO, AO BOLTON, T FOUDAS, C KING, BJ LEFMANN, WC LEUNG, WC MISHRA, SR OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, FO FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK TI HADRON SHOWER ENERGY AND DIRECTION MEASUREMENTS USING DRIFT CHAMBERS (VOL 340, PG 474, 1994) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Correction, Addition C1 COLUMBIA UNIV,NEW YORK,NY 10027. UNIV CHICAGO,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ROCHESTER,ROCHESTER,NY 14627. RP KINNEL, TS (reprint author), UNIV WISCONSIN,MADISON,WI 53706, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1995 VL 365 IS 2-3 BP 607 EP 608 DI 10.1016/0168-9002(95)00397-5 PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA TF304 UT WOS:A1995TF30400046 ER PT J AU ROUQUIER, S TRASK, BJ TAVIAUX, S VANDENENGH, G DIRIONG, S LENNON, GG GIORGI, D AF ROUQUIER, S TRASK, BJ TAVIAUX, S VANDENENGH, G DIRIONG, S LENNON, GG GIORGI, D TI DIRECT SELECTION OF CDNAS USING WHOLE CHROMOSOMES SO NUCLEIC ACIDS RESEARCH LA English DT Article ID FLUORESCENCE INSITU HYBRIDIZATION; SOMATIC-CELL HYBRIDS; TRANSCRIBED SEQUENCES; DNA-SEQUENCES; GENE; CLONING; PCR; AMPLIFICATION; INTERPHASE; STRATEGY AB We have developed a method for direct selection of cDNAs using whole chromosomes as target DNA. Double-strand cDNAs were synthesized from human fetal brain polyadenylated mRNAs. Flow-sorted chromosomes 17 and 19 were amplified by degenerate oligonucleotide primed polymerase chain reaction (DOP-PCR) and used to capture ds cDNAs by an improved magnetic bead capture protocol. To demonstrate the capabilities of this method, the selected cDNAs were used as probes in FISH experiments. The selected cDNA populations specifically painted chromosomes 17 or 19 on metaphase spreads. These results demonstrate that it is possible to do chromosome painting using cDNA probes and that this method is a means to rapidly select expressed sequences encoded by any portion of the genome. C1 CTR RECH BIOCHIM MACROMOLEC,CNRS,UPR 9008,F-34033 MONTPELLIER,FRANCE. UNIV WASHINGTON,DEPT MOLEC BIOTECHNOL FJ20,SEATTLE,WA 98195. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. NR 36 TC 12 Z9 12 U1 0 U2 2 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 NOV 11 PY 1995 VL 23 IS 21 BP 4415 EP 4420 DI 10.1093/nar/23.21.4415 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TG424 UT WOS:A1995TG42400027 PM 7501464 ER PT J AU SMOAKE, JA MOY, GMM FANG, BS SOLOMON, SS AF SMOAKE, JA MOY, GMM FANG, BS SOLOMON, SS TI CALMODULIN-DEPENDENT CYCLIC-AMP PHOSPHODIESTERASE IN LIVER PLASMA-MEMBRANES - STIMULATED BY INSULIN SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article DE INSULIN; CALMODULIN; PHOSPHODIESTERASE; PLASMA MEMBRANES; LIVER CELLS; CALMODULIN-INHIBITORS ID RAT-LIVER; NUCLEOTIDE PHOSPHODIESTERASE; SENSITIVE PHOSPHODIESTERASE; ADIPOSE-TISSUE; FAT-CELLS; ACTIVATION; PHOSPHORYLATION; GLUCAGON; ADIPOCYTES; RECEPTOR AB In vivo insulin consistently stimulates the plasma membrane, high-affinity (low K-m) cyclic AMP phosphodiesterase (PDE) from diabetic rat liver or adipose tissue, lit vitro stimulation of membrane PDE by insulin has been reported to be inconsistent, Also, the involvement of calmodulin (CaM) in insulin stimulation of PDE has been controversial, In this report, conditions for the isolation of rat liver plasma membranes containing PDE that is sensitive to in vitro insulin stimulation and the involvement of CaM in insulin stimulation of PDE were investigated, In vitro insulin raised the V-max of the enzyme without altering its apparent K-m and was dose dependent. Insulin stimulation was lost after freezing, sonication, solubilization with detergents, or storage of the membranes at 4 degrees C for 4 h after isolation, Insulin stimulation was completely blocked by the CaM antagonist compound 48/80, EG;TA, or trifluoperazine, Two isoforms of membrane-bound PDE were separated by ion-exchange chromatography following solubilization of the plasma membranes, The activities of both isoforms were stimulated by exogenous CaM. Plasma membrane PDE eluted after the application of exogenous CaM plus Ca2+. The data support the concept of a critical involvement of CaM in insulin activation of liver membrane PDE. (C) 1995 Academic Press, Inc. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. VET AFFAIRS MED CTR,DIV ENDOCRINE,MEMPHIS,TN 38104. UNIV TENNESSEE,HLTH SCI CTR,MEMPHIS,TN 38104. RP SMOAKE, JA (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT BIOL,SOCORRO,NM 87801, USA. NR 47 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD NOV 10 PY 1995 VL 323 IS 2 BP 223 EP 232 DI 10.1006/abbi.1995.9971 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA TE643 UT WOS:A1995TE64300002 PM 7487081 ER PT J AU TEGMARK, M BROMLEY, BC AF TEGMARK, M BROMLEY, BC TI REAL-SPACE COSMIC FIELDS FROM REDSHIFT-SPACE DISTRIBUTIONS - GREENS-FUNCTION APPROACH SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, THEORY; GALAXIES, DISTANCES AND REDSHIFTS; LARGE-SCALE STRUCTURE OF UNIVERSE; METHODS, ANALYTICAL ID DENSITY FIELDS; VELOCITY; GALAXIES; OMEGA AB We present a new method for reconstructing the cosmological density, peculiar velocity, and peculiar gravitational potential on large scales from redshift data. We remove the distorting effects of line-of-sight peculiar motions by using the linear theory of gravitational instability, in which the potential is the solution to a linear partial differential equation first derived by Raiser. We solve this equation by deriving its Green's function; the Green's functions for the peculiar velocity and the real-space density follow directly. Reconstruction of the cosmic fields is thus reduced to integration over redshift space with the appropriate Green's function kernel. Our algorithm has a single input parameter, beta = Omega(0.6)/b, where b is the linear bias factor and Omega is the cosmological density parameter. We discuss the virtues of this method for error control, for estimating beta, and for constraining the bias mechanism. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TEGMARK, M (reprint author), MAX PLANCK INST PHYS & ASTROPHYS,FOHRINGER RING 6,D-80805 MUNICH,GERMANY. NR 18 TC 9 Z9 9 U1 1 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1995 VL 453 IS 2 BP 533 EP 540 DI 10.1086/176415 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TC992 UT WOS:A1995TC99200001 ER PT J AU HALPERN, JP HELFAND, DJ MORAN, EC AF HALPERN, JP HELFAND, DJ MORAN, EC TI NO X-RAY-LUMINOUS STARBURSTS IN THE EINSTEIN MEDIUM SENSITIVITY SURVEY, EITHER SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; GALAXIES, SEYFERT; GALAXIES, STARBURST; X-RAYS, GALAXIES ID ACTIVE GALACTIC NUCLEI; OPTICAL SPECTROSCOPY; SEYFERT-GALAXIES; EMISSION; SEARCH; HIDDEN AB We continue to investigate recurrent claims that a substantial number of ''normal'' star-forming galaxies may have X-ray luminosities in the range 10(42-44) ergs s(-1). In this installment, we present new spectra of four such emission-line galaxies that were ambiguously classified in the Einstein Extended Medium Sensitivity Survey (EMSS), and find that they all have intermediate-type Seyfert nuclei as evidenced by broad components of their Ha lines. We argue that any of the remaining emission-line galaxies in the EMSS with 10(42) < L(X) < 10(44) ergs s(-1) that were flagged as needing further spectroscopic work are almost certain to have active nuclei as well. We conclude that in these as well as other samples of X-ray-selected emission-line galaxies, X-ray luminosities in excess of 10(42) ergs s(-1) can and should be attributed to an active nucleus, even in the case that most of the infrared continuum or optical emission-line luminosity is caused by star formation. There is as yet no good evidence for X-ray-luminous starbursts. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94450. RP HALPERN, JP (reprint author), COLUMBIA UNIV,COLUMBIA ASTROPHYS LAB,538 W 120TH ST,NEW YORK,NY 10027, USA. NR 23 TC 16 Z9 16 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 NOV 10 PY 1995 VL 453 IS 2 BP 611 EP 615 DI 10.1086/176424 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TC992 UT WOS:A1995TC99200010 ER PT J AU ROHLFING, CM AF ROHLFING, CM TI A THEORETICAL-STUDY OF HCLO(3) ISOMERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID CORRELATED MOLECULAR CALCULATIONS; GAUSSIAN-BASIS SETS; VIBRATIONAL-SPECTRA; OZONE; ENERGETICS; CL2O2 AB Ab initio quantum chemical calculations on normal and hypervalent structures of the HClO3 species have been performed. Four minima were located at the MP2/6-31G(d) level, after many connectivities were investigated. Geometries and frequencies were determined at the QCISD/6-311G(2d, 2p) level. Single point energy calculations using QCISD(T) with larger basis sets indicate that the lowest energy structure is hypervalent HOClO2, upon inclusion of f functions. Also, relative energies computed with the G2 method are in good agreement with the QCISD(T) results with large basis sets. RP ROHLFING, CM (reprint author), SANDIA NATL LABS,DEPT COMBUST CHEM,MS 9055,LIVERMORE,CA 94551, USA. NR 16 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 10 PY 1995 VL 245 IS 6 BP 665 EP 670 DI 10.1016/0009-2614(95)01050-J PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE588 UT WOS:A1995TE58800023 ER PT J AU BURLEIGH, DC WAGNER, AF AF BURLEIGH, DC WAGNER, AF TI AN ADAPTATION OF THE LOG-DERIVATIVE METHOD TO MASSIVELY-PARALLEL COMPUTERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID H+CO-REVERSIBLE-HCO; STATE DISTRIBUTIONS; QUANTUM DYNAMICS; SCATTERING; RESONANCES; STABILIZATION; ENERGIES; CO AB We present a strategy for parallelization of the log-derivative quantum dynamics method suitable for smaller basis set calculations where many different energies must be examined. Parallelization of work specific to both the scattering coordinate grid and the energy grid is accomplished but all matrix manipulations are carried out on single processors. We execute this strategy for a realistic triatomic scattering problem on three parallel computers: one modestly parallel, shared-memory computer and two massively parallel, distributed-memory computers. Results show successful parallelization on the two massively parallel computers. RP BURLEIGH, DC (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 27 TC 1 Z9 1 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 NOV 10 PY 1995 VL 245 IS 6 BP 679 EP 687 DI 10.1016/0009-2614(95)01032-5 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE588 UT WOS:A1995TE58800025 ER PT J AU MOMBERGER, K BELKACEM, A SORENSEN, AH AF MOMBERGER, K BELKACEM, A SORENSEN, AH TI NONPERTURBATIVE MOMENTUM-SPACE APPROACH TO RELATIVISTIC HEAVY-ION COLLISIONS SO EUROPHYSICS LETTERS LA English DT Article ID POSITRON PAIR PRODUCTION; NONPERTURBATIVE CHARACTER; IONIZATION; CAPTURE; EXCITATION; CREATION AB New non-perturbative numerical calculations have been performed to study atomic processes in relativistic heavy-ion collisions. The propagation of the electron wave function is treated entirely in momentum space. Our method has been applied for Au79+ and U92+ impinging on U91+ at 0.24-10 GeV/u. Probabilities have been obtained for bound-free pair production, charge transfer, ionization and excitation. For bound-free pair production at small impact parameters, our results confirm the breakdown of perturbation theory but the increase is much smaller than that reported by other non-perturbative methods. C1 AARHUS UNIV,INST PHYS & ASTRON,DK-8000 AARHUS C,DENMARK. RP MOMBERGER, K (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 20 TC 10 Z9 10 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD NOV 10 PY 1995 VL 32 IS 5 BP 401 EP 406 DI 10.1209/0295-5075/32/5/004 PG 6 WC Physics, Multidisciplinary SC Physics GA TF888 UT WOS:A1995TF88800004 ER PT J AU MCNAMARA, DE OWENS, TJ WALTER, WR AF MCNAMARA, DE OWENS, TJ WALTER, WR TI OBSERVATIONS OF REGIONAL PHASE PROPAGATION ACROSS THE TIBETAN PLATEAU SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID WAVE VELOCITY STRUCTURE; CONTINENTAL LITHOSPHERE; BENEATH TIBET; UPPER MANTLE; TECTONIC IMPLICATIONS; LATERAL VARIATIONS; HIMALAYAN ARC; INDIAN SHIELD; PN; EARTHQUAKES AB We present observations of regional phase velocity and propagation characteristics using data recorded during a 1-year deployment of broadband digital seismic stations across the central Tibetan Plateau along the Qinghai-Tibet highway from Golmud to Lhasa. Previous seismological studies within this region have had to rely on earthquakes recorded almost exclusively at stations outside of the plateau. We have the opportunity to study numerous source-receiver paths confined entirely within the Tibetan Plateau. Our analysis concentrates on travel time, amplitude, and frequency content measurements of the Pg, Pn, and Sn phases. Pn can be clearly picked for all observed paths and propagates at an average velocity of 8.16+/-0.07 km/s within the Tibetan Plateau, Sn,however, shows dramatic variations in propagation efficiency across the Tibetan Plateau that is strongly dependent on frequency, We observe that Sn rapidly decreases in frequency and amplitude as it passes through the northern portion of the plateau. We show that in general, Sn propagation efficiency decreases with increasing frequency content. We use 122 events from outside of the plateau and 61 from within to refine the boundaries of a region of inefficient high-frequency Sn propagation. Specifically, we show that a larger portion of the northern Tibetan Plateau attenuates Sn energy than was previously suggested. In the southern plateau, where high-frequency Sn is observed, we computed an average velocity of 4.59+/-0.18 km/s. We also observed that the Pn velocity within this region of inefficient high-frequency Sn propagation is nearly 4% slower than the Pn velocity computed for paths restricted to the southern plateau and that the crust is about 10 lan thinner than in the south. The coincident locations of inefficient Sn propagation and slow Pn velocity is commonly observed in regions of active tectonics. Our results add constraints to the velocity structure of the lithosphere beneath the Tibetan Plateau and require first-order lateral variations in the uppermost mantle structure, despite the relatively uniform topography of the plateau. C1 UNIV S CAROLINA, DEPT GEOL SCI, COLUMBIA, SC 29208 USA. RP MCNAMARA, DE (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV EARTH SCI, POB 808, L-202, LIVERMORE, CA 94551 USA. RI Walter, William/C-2351-2013 OI Walter, William/0000-0002-0331-0616 NR 33 TC 107 Z9 116 U1 4 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD NOV 10 PY 1995 VL 100 IS B11 BP 22215 EP 22229 DI 10.1029/95JB01863 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA TE225 UT WOS:A1995TE22500015 ER PT J AU KAGAWA, HK OSIPIUK, J MALTSEV, N OVERBEEK, R QUAITERANDALL, E JOACHIMIAK, A TRENT, JD AF KAGAWA, HK OSIPIUK, J MALTSEV, N OVERBEEK, R QUAITERANDALL, E JOACHIMIAK, A TRENT, JD TI THE 60 KDA HEAT-SHOCK PROTEINS IN THE HYPERTHERMOPHILIC ARCHAEON SULFOLOBUS-SHIBATAE SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE ARCHAEA; HSP60; CHAPERONIN; TCP1; PHYLOGENY ID THERMOPHILIC ARCHAEBACTERIUM; TRANSCRIPTION SIGNALS; MOLECULAR CHAPERONE; THERMOPROTEUS-TENAX; MUTATIONAL ANALYSIS; STABLE RNA; TATA BOX; ORGANIZATION; PROMOTER; GENES AB One of the most abundant proteins in the hyperthermophilic archaeon Sulfolobus shibatae is the 59 kDa heat shock protein (TF55) that is believed to form a homo-oligomeric double ring complex structurally similar to the bacterial chaperonins. We discovered a second protein subunit in the S. shibatae ring complex (referred to as alpha) that is stoichiometric with TF55 (renamed beta). The gene and flanking regions of alpha were cloned and sequenced and its inferred amino acid sequence has 54.4% identity and 74.4% similarity to beta. Transcription start sites for both alpha and beta were mapped and three potential transcription regulatory regions were identified. Northern analyses of cultures shifted from normal growth temperatures (70 to 75 degrees C) to heat shock temperatures (85 to 90 degrees C) indicated that the levels of alpha and beta mRNAs increased during heat shock, but at all temperatures their relative proportions remained constant. Monitoring protein synthesis by autoradiography of total proteins from cultures pulse labeled with L-[S-35]methionine at normal and heat shock temperatures indicated significant increases in alpha and beta synthesis during heat shock. Under extreme heat shock conditions (greater than or equal to 90 degrees C) alpha and beta appeared to be the only two proteins synthesized. The purified alpha and beta subunits combined to form high molecular mass complexes with similar mobilities on native polyacrylamide gels to the complexes isolated directly from cells. Equal proportions of the two subunits gave the greatest yield of the complex, which we refer to as a ''rosettasome''. It is argued that the rosettasome consists of two homo oligomeric rings; one of alpha and the other of beta. Polyclonal antibodies against alpha and beta from S, shibatae cross-reacted with proteins of similar molecular mass in 10 out of the 17 archaeal species tested, suggesting that the two rosettasome proteins are highly conserved among the archaea. The archaeal sequences were aligned with bacterial and eukaryotic chaperonins to generate a phylogenetic tree. The tree reveals the close relationship between the archaeal rosettasomes and the eukaryotic TCP1 protein family and the distant relationship to the bacterial GroEL/HSP60 proteins. (C) 1995 Academic Press Limited C1 ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. NR 55 TC 84 Z9 89 U1 1 U2 3 PU ACADEMIC PRESS (LONDON) LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD NOV 10 PY 1995 VL 253 IS 5 BP 712 EP 725 DI 10.1006/jmbi.1995.0585 PG 14 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TE148 UT WOS:A1995TE14800007 PM 7473746 ER PT J AU Kanner, GS Frolov, S Vardeny, ZV AF Kanner, GS Frolov, S Vardeny, ZV TI Photoinduced strain as a probe of acoustical and electronic properties of conducting polymers SO MODERN PHYSICS LETTERS B LA English DT Review ID NONLINEAR OPTICAL-RESPONSE; PICOSECOND LIGHT-PULSES; 2-PHOTON ABSORPTION; POLYACETYLENE FILMS; PHONON GENERATION; RAMAN-SCATTERING; THIN-FILMS; POLYTHIOPHENE; SPECTROSCOPY; SPECTRA AB We discuss applications of photogenerated strain in transient absorption experiments. These include measurements of sound velocity, phonon dispersion relations, and excited electronic state energy levels. In particular, we have identified a new type of spectroscopy in photoinduced absorption that can be used to detect both allowed and forbidden electronic transitions in thin semiconducting films. This technique was applied to a host of conducting polymers for which we detected energy levels of various excitonic states with odd and even symmetry. C1 UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. RP Kanner, GS (reprint author), LOS ALAMOS NATL LAB,CHEM SCI & TECHNOL DIV,MS G755,LOS ALAMOS,NM 87545, USA. NR 46 TC 2 Z9 2 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-9849 J9 MOD PHYS LETT B JI Mod. Phys. Lett. B PD NOV 10 PY 1995 VL 9 IS 26-27 BP 1701 EP 1717 DI 10.1142/S021798499500173X PG 17 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA UG090 UT WOS:A1995UG09000001 ER PT J AU LEDOUSSAL, P VINOKUR, VM AF LEDOUSSAL, P VINOKUR, VM TI CREEP IN ONE-DIMENSION AND PHENOMENOLOGICAL THEORY OF GLASS DYNAMICS SO PHYSICA C LA English DT Article ID RANDOM-MEDIA; CLASSICAL DIFFUSION; RANDOM ENVIRONMENT; SURFACE GROWTH; RANDOM-WALKS; INTERFACES; CHAIN; MODEL; TIME AB The dynamics of a glass transition is discussed in terms of the motion of a particle in a one-dimensional correlated random potential. An exact calculation of the velocity V under an applied force f demonstrates a variety of dynamic regimes depending on the range of correlations. In a gaussian potential with correlator C(x) = x(gamma) we find a transition from ohmic behavior (gamma < 0) to creep motion V similar to exp(- const/f(mu)) (0 < gamma < 1). This provides a generic picture of the glass transition in systems where long-range correlations in the effective disorder develop due to elasticity such as elastic manifolds subject to quenched disorder and the vortex-glass transition in superconductors. C1 UNIV CALIF SANTA BARBARA,ITP,SANTA BARBARA,CA 93106. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LEDOUSSAL, P (reprint author), ECOLE NORMALE SUPER,CNRS,PHYS THEOR LAB,24 RUE LHOMOND,F-75231 PARIS,FRANCE. NR 31 TC 46 Z9 46 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 10 PY 1995 VL 254 IS 1-2 BP 63 EP 68 DI 10.1016/0921-4534(95)00545-5 PG 6 WC Physics, Applied SC Physics GA TF818 UT WOS:A1995TF81800008 ER PT J AU Volkow, ND Tancredi, LR Grant, C Gillespie, H Valentine, A Mullani, N Wang, GJ Hollister, L AF Volkow, ND Tancredi, LR Grant, C Gillespie, H Valentine, A Mullani, N Wang, GJ Hollister, L TI Brain glucose metabolism in violent psychiatric patients: A preliminary study SO PSYCHIATRY RESEARCH-NEUROIMAGING LA English DT Article DE positron emission tomography; intermittent explosive disorder; antisocial personality; Schizophrenia; frontal lobe; temporal lobe ID CERCOPITHECUS-AETHIOPS-SABAEUS; POSITRON EMISSION TOMOGRAPHY; VERVET MONKEYS; BEHAVIOR; AGGRESSION; SEROTONIN AB Positron emission tomography with F-18-deoxyglucose was used to evaluate regional brain glucose metabolism in eight normal subjects and eight psychiatric patients with a history of repetitive violent behavior. Seven of the patients showed widespread areas of low brain metabolism. Although the location of the abnormal regions varied among patients, they showed significantly lower relative metabolic values in medial temporal and prefrontal cortices than did normal comparison subjects. These regions have been implicated as substrates for aggression and impulsivity, and their dysfunction may have contributed to the patients' violent behavior. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. UNIV TEXAS,HLTH SCI CTR,DEPT PSYCHIAT,HOUSTON,TX 77030. UNIV TEXAS,HLTH SCI CTR,DIV CARDIOL,HOUSTON,TX 77030. RP Volkow, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NIAAA NIH HHS [AA 09481] NR 45 TC 96 Z9 97 U1 0 U2 7 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0925-4927 J9 PSYCHIAT RES-NEUROIM JI Psychiatry Res. Neuroimaging PD NOV 10 PY 1995 VL 61 IS 4 BP 243 EP 253 DI 10.1016/0925-4927(95)02671-J PG 11 WC Clinical Neurology; Neuroimaging; Psychiatry SC Neurosciences & Neurology; Psychiatry GA TK689 UT WOS:A1995TK68900005 PM 8748468 ER PT J AU SCHULBERG, MT ALLENDORF, MD OUTKA, DA AF SCHULBERG, MT ALLENDORF, MD OUTKA, DA TI THE ADSORPTION OF HYDROGEN-CHLORIDE ON POLYCRYSTALLINE BETA-SILICON CARBIDE SO SURFACE SCIENCE LA English DT Article DE ADSORPTION KINETICS; AUGER ELECTRON SPECTROSCOPY; CHEMISORPTION; HYDROGEN CHLORIDE; MOLECULE-SOLID REACTIONS; POLYCRYSTALLINE SURFACES; SILICON CARBIDE; STICKING; THERMAL DESORPTION SPECTROSCOPY ID AUGER-ELECTRON SPECTROSCOPY; CHEMICAL-VAPOR-DEPOSITION; SURFACE; SI(100); HCL; BETA-SIC(100); CHEMISORPTION; SI(111)7X7; MOLECULES; PRECURSOR AB The reactivity of HCl, a by-product of SiC chemical vapor deposition (CVD) from chlorine-containing precursors, is of particular interest because it has been reported that addition of HCl inhibits the SiC CVD process. In this study, HCl adsorption on polycrystalline beta-SiC was examined with Auger electron spectroscopy and temperature-programmed desorption (TPD). HCl adsorbs readily on SiC at 300 K with an initial sticking probability of 0.11 and forms a strong bond with an activation energy for desorption of 64 kcal/mol. The only product detected by TPD is HCl, which desorbs in a peak centered at 1010 K. No silicon- or carbon-containing desorption products are found, demonstrating that HCl does not etch the SiC surface under these conditions. HCl inhibition of SiC CVD can be accounted for qualitatively with a surface site-blocking mechanism. RP SCHULBERG, MT (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 36 TC 13 Z9 13 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 10 PY 1995 VL 341 IS 3 BP 262 EP 272 DI 10.1016/0039-6028(95)00742-3 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA TE671 UT WOS:A1995TE67100016 ER PT J AU MAGNI, E SOMORJAI, GA AF MAGNI, E SOMORJAI, GA TI ELECTRON-IRRADIATION-INDUCED REDUCTION OF MAGNESIUM-CHLORIDE THIN-FILMS DEPOSITED ON GOLD - XPS AND ISS STUDY SO SURFACE SCIENCE LA English DT Letter DE ELECTRON STIMULATED DESORPTION (ESD); ION BOMBARDMENT; ION SCATTERING SPECTROSCOPY; MAGNESIUM; MAGNESIUM CHLORIDE; POLYCRYSTALLINE THIN FILMS; X-RAY PHOTOELECTRON SPECTROSCOPY ID PHOTON-STIMULATED DESORPTION; ALKALI-HALIDE CRYSTALS; BAND-GAP REGION; LATTICE-DEFECTS; SURFACE; LIF; BOMBARDMENT; DEPENDENCE; CREATION; SPECTRUM AB The ion and electron beam stimulated desorption from MgCl2 ultra-thin films is reported. The films are prepared by gas phase deposition of MgCl2 on a polycrystalline Au foil in ultra-high vacuum conditions. The MgCl2 film, held at 330 K, is uniformly bombarded with Ar-ions or electrons of 1 keV of energy. The chemical composition of the film is monitored by XPS and ISS. The ionic film surface is terminated by Cl atoms, as shown by ISS. The ion bombardment sputters the MgCl2 film, without changing the chemical composition of the film surface. In contrast, the electron beam damages markedly the film, with the reduction of Mg2+ to the metallic state. Only 10% of the original Cl is left in the film after 30 min of electron bombardment. The ISS analysis shows that Mg atoms appear on the film surface after electron irradiation. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 43 TC 35 Z9 35 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 10 PY 1995 VL 341 IS 3 BP L1078 EP L1084 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA TE671 UT WOS:A1995TE67100009 ER PT J AU WALDFRIED, C MCILROY, DN LI, DQ PEARSON, J BADER, SD DOWBEN, PA AF WALDFRIED, C MCILROY, DN LI, DQ PEARSON, J BADER, SD DOWBEN, PA TI DISSOCIATIVE NITROGEN CHEMISORPTION AND BONDING ON GD(0001) SO SURFACE SCIENCE LA English DT Letter DE CHEMISORPTION; GADOLINIUM; NITROGEN; PHOTOEMISSION ID ANGLE-RESOLVED-PHOTOEMISSION; SURFACE ELECTRONIC-STRUCTURE; MOLECULAR NITROGEN; PD(111) SURFACE; ADSORPTION; GD; N2; TEMPERATURE; METAL; 20-K AB The electronic structure of dissociatively chemisorbed nitrogen on Gd(0001) has been studied using angle-resolved photoemission at 150 K. The symmetry of the nitrogen-induced states and bonding configuration for the initial chemisorption has been identified. Bonding occurs above the Gd(0001) surface plane via the N p(x) orbital. Two possible adsorption sites are postulated, with preferential occupancy that is dependent upon coverage. C1 UNIV NEBRASKA,DEPT PHYS,LINCOLN,NE 68588. UNIV NEBRASKA,CTR MAT RES & ANAL,LINCOLN,NE 68588. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Bader, Samuel/A-2995-2013 NR 44 TC 8 Z9 8 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 10 PY 1995 VL 341 IS 3 BP L1072 EP L1077 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA TE671 UT WOS:A1995TE67100008 ER PT J AU MONKS, PS STIEF, LJ TARDY, DC LIEBMAN, JF ZHANG, ZY KUO, SC KLEMM, RB AF MONKS, PS STIEF, LJ TARDY, DC LIEBMAN, JF ZHANG, ZY KUO, SC KLEMM, RB TI DISCHARGE FLOW-PHOTOIONIZATION MASS-SPECTROMETRIC STUDY OF HOI - PHOTOIONIZATION EFFICIENCY SPECTRUM AND IONIZATION-ENERGY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; EXCITED MOLECULES; KINETICS; OH; RADICALS; RELAXATION; IODINE; 298-K; I-2 AB Photoionization efficiency (PIE) spectra of HOI were measured over the wavelength range lambda = 115-130 nm and in the ionization threshold region, lambda = 123-129 nm, using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. HOI was generated, in situ but in varying amounts, by three separate reactions: OH + I-2; OH + CF3I; O(P-3) + C2H5I. The PIE spectra displayed steplike behavior near threshold, and the HO-I stretching frequency in the cation was determined to be 702 +/- 60 cm(-1). A value of (9.81(1) +/- 0.02(0)) eV was obtained for the adiabatic ionization energy (IE) of HOI from photoion thresholds, corresponding to the HOI+(X(2)A '') <-- HOI(X(l)A') transition. Even though the present result appears to be the first reported determination of IE(HOI), the experimental value is compared to an estimated value previously derived via a trend analysis and it is considered in terms of trends in the series IE(HOX), where X = F, Cl, Br, and I. The branching ratio for [HOI]/[IO] in the O(P-3) + C2H5I reaction was estimated to be about 8/1 at T = 298 K if we assume that the photoionization efficiencies for HOI and IO are the same at 10.3 eV (lambda = 120 nm). Also, based on the value for IE(HOI) derived in the present study, a value for IE(IO) approximate to 9.66 +/- 0.10 eV has been predicted. C1 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. UNIV IOWA,DEPT CHEM,IOWA CITY,IA 52242. UNIV MARYLAND,DEPT CHEM & BIOCHEM,BALTIMORE,MD 21228. BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Monks, Paul/H-6468-2016 OI Monks, Paul/0000-0001-9984-4390 NR 43 TC 32 Z9 32 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 9 PY 1995 VL 99 IS 45 BP 16566 EP 16570 DI 10.1021/j100045a013 PG 5 WC Chemistry, Physical SC Chemistry GA TD900 UT WOS:A1995TD90000013 ER PT J AU MOALEM, M BALOOCH, M HAMZA, AV RUOFF, RS AF MOALEM, M BALOOCH, M HAMZA, AV RUOFF, RS TI SUBLIMATION OF HIGHER FULLERENES AND THEIR INTERACTION WITH SILICON(100) SURFACE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID C84; ISOMERS; C-60; C-76 AB The heat of sublimation of C-60, C-70, C-78, C-84, and C-96 is measured by modulated molecular beam mass spectrometry (MMBMS). For a mixture of these fullerenes the heat of sublimation is 39 +/- 5, 43 +/- 5, 47 +/- 18, 59 +/- 6, and 65 +/- 11 kcal/mol, respectively, and did not change with the variation in composition. The partial pressure of C-84 is estimated to be P-84 = 7.0 x 10(12) exp[-59.4 kcal/mol/RT] Torr. The scattering of C-70 and C-84 from Si(100) is also investigated by MMBMS. The behavior of C-84 is quite similar to that of C-60 reported earlier By Hamza, Balooch, and Moalem (Surf. Sci. 1994, 317, L1129) except that the onset of surface decomposition of the fullerene occurs at 850 g, 150 K lower than for C-60. When the surface temperature reaches 1000 K, total decomposition of the incident C-84 is observed. The behavior of C-70 is surprisingly different from both C-60 and C-84 Twenty percent of the incident C-70 decomposes at 1000 K, and the remaining 80% does not decompose until a target temperature of 1200 K is reached. At surface temperatures below 800 K, for the interaction of C-70 and C-84 with silicon, the dominant surface processes are adsorption with near perfect sticking probability, followed by surface diffusion to the edge of the specimen and desorption. The ratio of desorption rate constant kd, to diffusion coefficient, D-s, for C-70 and C-84 was calculated to be 2.7 x 10(16) exp(-40 (kcal/mol/RT) and 7.8 x 10(7) exp(-22 (kcal/mol/RT) cm(-2), respectively. C1 LAWRENCE LIVERMORE NATL LAB,DIV CHEM & MAT SCI,LIVERMORE,CA 94550. SRI INT,MOLEC PHYS LAB,MENLO PK,CA 94025. RP MOALEM, M (reprint author), UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720, USA. RI Ruoff, Rodney/B-7605-2009; Ruoff, Rodney/K-3879-2015 NR 19 TC 16 Z9 16 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 9 PY 1995 VL 99 IS 45 BP 16736 EP 16741 DI 10.1021/j100045a038 PG 6 WC Chemistry, Physical SC Chemistry GA TD900 UT WOS:A1995TD90000038 ER PT J AU GASTEIGER, HA MARKOVIC, NM ROSS, PN AF GASTEIGER, HA MARKOVIC, NM ROSS, PN TI H-2 AND CO ELECTROOXIDATION ON WELL-CHARACTERIZED PT, RU, AND PT-RU .2. ROTATING DISK ELECTRODE STUDIES OF CO/H-2 MIXTURES AT 62-DEGREES-C SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CARBON-MONOXIDE; FORMIC-ACID; HYDROGEN ADSORPTION; IR SPECTROSCOPY; PLATINUM; OXIDATION; METHANOL; DIFFUSION; COVERAGES; BEHAVIOR AB Electrooxidation kinetics of mixtures of carbon monoxide and hydrogen were studied on well-characterized surfaces of Pt, Ru, and two Pt-Ru alloys (Ru surface composition of approximate to 50 atomic % and approximate to 90 atomic %, respectively, determined by low energy ion scattering) in 0.5 M H2SO4 at 62 degrees C. Subsequent to electrode cleaning in UHV by ion-sputtering, the electrodes were transferred from UHV into a rotating disk electrode (RDE) configuration in a conventional electrochemical cell. While pure Ru is completely inactive for CO/H-2 electrooxidation, CO/H-2 oxidation on the alloy electrodes is characterized by two states of activity: a state of low but finite activity at potentials below ca. 0.3-0.4 V, and a highly active (mass-transfer limited) state at more positive potentials. The exact potential of the transition shifts negatively with an increase in the Ru surface composition, and a decrease in the CO concentration (from 2% to 0.1% CO), consistent with the measured negative reaction order with respect to solution phase CO. In contrast, pure Pt surfaces have no measurable activity below 0.4 V and the transition to a highly active state occurs at potentials above 0.5-0.7 V. On Pt and Pt-Ru alloys, the transition to the highly active state coincides with the oxidative stripping of adsorbed CO, while the reaction at potentials below 0.4 V on the alloy surfaces appears to be the oxidation of hydrogen via transient holes in the CO adlayer. The absolute activity of the Pt-Ru alloys at potentials below the transition potential is too low to be of practical use in polymer electrolyte membrane (PEM) fuel cells; in such cells the anode overpotential with CO/H-2 mixtures of 0.1-2% CO will be at least 0.35 V. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 38 TC 246 Z9 249 U1 3 U2 59 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 9 PY 1995 VL 99 IS 45 BP 16757 EP 16767 DI 10.1021/j100045a042 PG 11 WC Chemistry, Physical SC Chemistry GA TD900 UT WOS:A1995TD90000042 ER PT J AU DONG, ZC CORBETT, JD AF DONG, ZC CORBETT, JD TI NA15K6TL18H - A REMARKABLE HYDROGEN-STABILIZED ZINTL PHASE WITH ISOLATED (TL6H)(7-) AND (TL12NA)(13-) POLYANIONS SO INORGANIC CHEMISTRY LA English DT Article AB An altered mixture of alkali metals and a trace of hydrogen afford a novel variant of bce Na4K6Tl13 in which one Tl-centered icosahedron is replaced by a regular H-centered octahedron, and the other, by a Na-centered icosahedron, the changes reflecting specific cation solvation and overall electronic requirements. The anionic polyhedral shapes and cation positions about the cell are shown on the left. Adventitious sources are sufficient to provide the hydrogen essential for the formation of this novel compound with its centered, closed-shell polyanions. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. NR 14 TC 14 Z9 14 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 8 PY 1995 VL 34 IS 23 BP 5709 EP & DI 10.1021/ic00127a005 PG 0 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TD990 UT WOS:A1995TD99000005 ER PT J AU REYNOLDS, JG SENDLINGER, SC MURRAY, AM HUFFMAN, JC CHRISTOU, G AF REYNOLDS, JG SENDLINGER, SC MURRAY, AM HUFFMAN, JC CHRISTOU, G TI SYNTHESIS AND CHARACTERIZATION OF VANADIUM(II,III,IV) COMPLEXES OF PYRIDINE-2-THIOLATE SO INORGANIC CHEMISTRY LA English DT Article ID X-RAY CRYSTAL; ELECTRON-PARAMAGNETIC-RES; MOLECULAR-STRUCTURE; HYDROTREATING CATALYSTS; PLATINUM(II) COMPLEXES; BINUCLEAR PLATINUM(II); COPPER(I) COMPLEXES; THIOLATE CHEMISTRY; BOND-CLEAVAGE; LIGANDS AB The synthesis and characterization are reported of vanadium complexes of pyridine-2-thiolate (pyt(-)) with the metal in oxidation states II, III, and IV. The reaction of VOCl2(THF)(2) with 2 equiv of Na(pyt) in THF leads to formation of [V2O2(pyt)(4)] (1). Complex 1 . 2THF . 1/3C(6)H(12) crystallizes in hexagonal space group R (3) over bar with the following cell dimensions at -171 degrees C: a = b = 30.888(21) Angstrom, c = 8.960(6) Angstrom, Z = 9, and V = 7402.8 Angstrom(3). A total of 1310 unique reflections with F > 2.33 sigma(F) were employed for structure solution and refinement to R (R(W)) values of 0.0613 (0.0563). The structure consists of two VO(pyt)(2) units joined together by two monoatomic bridges provided by S atoms of two pyt(-) groups. The V .. V distance is 3.989(2) Angstrom. The reaction of VCl3(THF)(3) with four equivalents of Na(pyt) in THF gives [VNa(pyt)(4)(THF)(2)] (2). Complex 2 crystallizes in triclinic space group P (1) over bar with the following unit cell dimensions at -171 degrees C: a = 10.442(2) Angstrom, b = 16.476(4) Angstrom, c = 9.465(2)Angstrom, alpha = 100.73(4)degrees, beta = 109.20(4)degrees, gamma = 87.86(3)degrees, Z = 2, and V = 1510.3 Angstrom(3). A total of 3391 unique reflections with F > 2.33 sigma(F) were employed for structure solution and refinement to R (R(W)) values of 0.0412 (0.0431). The structure is best described as a heterodinuclear complex with the metals monoatomically bridged by S atoms from three pyt(-) groups. The V is seven-coordinate, and the Na is six-coordinate. The V .. Na distance is 3.516(1) Angstrom. The reaction of VCl2(tmeda)(2) (tmeda = tetramethylethylenediamine) with 2 equiv of Na(pyt) in THF or CH2Cl2 yields [V(pyt)(2)(tmeda)] (3). Complex 3 crystallizes in orthorhombic space group B22(1)2 with the following cell dimensions at -170 degrees C: a = 14.338(5) Angstrom, b = 17.755(7) Angstrom, c = 7.255(2) Angstrom, Z = 4, and V = 1846.9 Angstrom(3). A total of 1192 unique reflections with F > 2.33 sigma(F) were employed for structure solution and refinement to R (R(W)) values of 0.0220 (0.0261). The complex contains chelating pyt(-) and tmeda groups with severely distorted octahedral geometry. Complexes 1, 2, and 3 have been characterized by EPR and/or IR spectroscopy. In addition, mass spectral studies are described for 1 and 2, directed toward identifying fragmentation pathways involving C-S bond cleavage within the pyt(-) group; the latter cleavage is detected in the mass spectra of both compounds. C1 INDIANA UNIV,CTR MOLEC STRUCT,BLOOMINGTON,IN 47405. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP REYNOLDS, JG (reprint author), INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405, USA. RI Christou, George /A-3072-2014 NR 86 TC 50 Z9 50 U1 3 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 8 PY 1995 VL 34 IS 23 BP 5745 EP 5752 DI 10.1021/ic00127a011 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TD990 UT WOS:A1995TD99000011 ER PT J AU RUSH, JD BIELSKI, BHJ AF RUSH, JD BIELSKI, BHJ TI STUDIES OF MANGANATE(V), MANGANATE(VI) AND MANGANATE(VII) TETRAOXYANIONS BY PULSE-RADIOLYSIS - OPTICAL-SPECTRA OF PROTONATED FORMS SO INORGANIC CHEMISTRY LA English DT Article ID PERMANGANATE ION; ALKALINE-SOLUTIONS; AQUEOUS-SOLUTIONS; OXIDATION; MECHANISM; ACID; COMPLEXES; KINETICS; RADICALS; INTERMEDIATE AB The tetrahedral oxyanions of manganate(VII), -(VI), and -(V) were seduced by pulse radiolytically generated free radicals derived from alcohols or formate and the hydrated electron. The UV-vis spectra of the unstable forms O3MnV(OH)(2-) and O3MnVI(OH)- show bleaching of the low-energy charge transfer bands at 325 and 610 nm that are associated with the fully deprotonated forms MnO43- and MnO42-, respectively. The corresponding acid dissociation constants were found to be pK(a)(O3Mn(OH)(2-)/MnO43-) = 13.7 +/- 0.2 and pK(a)(O3Mn(OH)(-)/MnO42-) = 7.4 +/- 0.1. Mononuclear Mn(IV) in 10 M NaOH exhibits a strong UV absorbance and a moderate absorption band at 650 nm. The beta-carbon radical derived from tert-butyl alcohol adds to an oxo ligand of MnO42- to produce a transient hypomanganate(V)-diol pseudo ester. This species hydrolyzes by solvent- and base-dependent pathways in alkaline solutions. A similar reaction occurs between the tert-butyl radical and MnO4- to form a manganate(VI) ester which is believed to convert to a chelated form. It was found that while the (CO2-)-C-. radical reduces manganate(VI) to hypomanganate(V) without formation of an observable transient, in reaction with permanganate(VII) it forms an adduct which upon hydrolysis yields manganate(VI). Rate constants for the reduction of manganate species in higher oxidation states by alcohol radicals, (CO2)-C-., O-2(-), and e(aq)(-) are reported. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 52 TC 11 Z9 12 U1 2 U2 20 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 8 PY 1995 VL 34 IS 23 BP 5832 EP 5838 DI 10.1021/ic00127a022 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TD990 UT WOS:A1995TD99000022 ER PT J AU HANSEN, PJ ESPENSON, JH AF HANSEN, PJ ESPENSON, JH TI OXIDATION OF CHLORIDE-IONS BY HYDROGEN-PEROXIDE, CATALYZED BY METHYLRHENIUM TRIOXIDE SO INORGANIC CHEMISTRY LA English DT Article ID MAIN-GROUP ELEMENTS; TRANSITION-METALS; MULTIPLE BONDS; VANADIUM BROMOPEROXIDASE; SINGLET OXYGEN; IODIDE-ION; MECHANISM; METHYLTRIOXORHENIUM; SYSTEM; CHLOROPEROXIDASE AB Methylrhenium trioxide, CH3ReO3, catalyzes the hydrogen peroxide oxidation of chloride ions in acidic aqueous solutions. The active catalytic species are the monoperoxo complex, CH3ReO2(eta(2)-O-2), A, and the diperoxo complex, CH3ReO(eta(2)-O-2)(2)(OH2), B. At 25 degrees C in 1.0 M HClO4 and mu = 2.0 M the rate constants for the reactions of A and B with Cl- were determined to be 0.059 +/- 0.007 and 0.124 +/- 0.005 L mol(-1) s(-1), respectively, and both were approximately 10(5) times faster than the rate constant for the uncatalyzed reaction under similar conditions. Kinetic experiments employed the initial-rate method; reactions were monitored by following the consumption of monochlorodimedone (MCD) at lambda = 270 nm. MCD reacts rapidly with the chloride ion oxidation product(s). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 46 TC 52 Z9 52 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 8 PY 1995 VL 34 IS 23 BP 5839 EP 5844 DI 10.1021/ic00127a023 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TD990 UT WOS:A1995TD99000023 ER PT J AU BOYLE, TJ BRADLEY, DC HAMPDENSMITH, MJ PATEL, A ZILLER, JW AF BOYLE, TJ BRADLEY, DC HAMPDENSMITH, MJ PATEL, A ZILLER, JW TI METRICAL COMPARISON AND ALKALI-METAL NMR SPECTROSCOPIC INVESTIGATION OF A CONGENER SET OF ALKALI METALATED TITANIUM(IV) ISOPROPOXIDES - X-RAY STRUCTURES OF [NATI(OCHME(2))(5)](INFINITY) AND [KTI(OCHME(2))(5)](INFINITY) SO INORGANIC CHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; HETEROMETALLIC ALKOXIDES; CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; COMPLEXES; PRECURSORS; REACTIVITY; ARYLOXIDES; OXIDES; BONDS AB The congeners of the alkali metal substituted titanium isopropoxide compound, [LiTi(OCHMe(2))(5)](2) (a) have been identified as [NaTi(OCHMe(2))s](infinity) (2) and [KTi(OCHMe(2))(5)](infinity) (3). Both 2 and 3 are polymeric species, wherein the alkali metal acts as a bridge between discrete, mononuclear, trigonal-bipyramidal, titanium pentaisopropoxide moieties. The infinite linear chains formed in 2 consist of alternating five coordinate titanium moieties and tetrahedral sodium atoms. Compound 3 forms a nonlinear continuous chain with the potassium atoms in an extremely distorted trigonal-bipyramidal geometry. A comparison of the metrical data of 1-3 and literature data reveals that the bond distances and angles of 1-3 agree with expected values. Compound 2 crystallized from pentane at -25 degrees C in the space group P2(1)/a with a = 12.616(1) Angstrom, b = 10.078(4) Angstrom, c = 17.573(4) Angstrom, and beta = 103.20 degrees, for Z = 4. Least squares refinement of the model based on 3801 reflections (\F-o\ > 3.0 sigma(\F-o\)) converged to a final R(F) = 8.57%. Crystals of 3 formed in the space group P2(1)/n with a 12.213(2) Angstrom, b = 9.792(2) Angstrom, c = 18.442(3) Angstrom, and beta = 106.944(12)degrees, for Z = 4. Least squares refinement of the model based on 3083 reflections (\F-o\ > 3.0 sigma(\Fo\)) converged to a final R(F) = 4.2%. Alkali metal (Li-7, Na-23) NMR spectroscopy data reveal that, in solution, 1 exists as a dimer with rapid alkoxide ligand exchange, whereas, for 2, a tight ion pair exists between Na+ and the Ti(OCHMe(2))(5)(-). C1 UNIV LONDON QUEEN MARY COLL,LONDON E1 4NS,ENGLAND. UNIV LONDON WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. GEC MARCONI MAT TECHNOL LTD,TOWCESTER NN12 8EQ,NORTHANTS,ENGLAND. UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717. RP BOYLE, TJ (reprint author), SANDIA NATL LABS,ADV MAT LAB,1001 UNIV BLVD SE,ALBUQUERQUE,NM 87106, USA. NR 94 TC 30 Z9 30 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 8 PY 1995 VL 34 IS 23 BP 5893 EP 5899 DI 10.1021/ic00127a030 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA TD990 UT WOS:A1995TD99000030 ER PT J AU GEZELTER, JD MILLER, WH AF GEZELTER, JD MILLER, WH TI RESONANT FEATURES IN THE ENERGY-DEPENDENCE OF THE RATE OF KETENE ISOMERIZATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LINEAR-SYSTEMS; RATE CONSTANTS AB Calculations of the microcanonical isomerization rates for vibrationally excited ketene are presented. The calculations utilize the quantum reactive scattering methodology of absorbing boundary conditions with a discrete variable representation to obtain the cumulative reaction probability for one form of ketene to isomerize via the oxirene intermediate, and were carried out with model 1-, 2-, and 3-degree-of-freedom potential energy surfaces constructed using ab initio data. Significant differences are seen in the energy dependent features of the microcanonical rate for the single mode and multi-mode potentials; e.g., the single mode potential exhibits tunneling resonances with widths of around 1 cm(-1), while the calculations involving more than one degree of freedom have additional resonant features that have widths around 10 cm(-1) and also exhibit non-Breit-Wigner resonant line shapes. This suggests that many of the resonance features are best described as Feshbach (energy transfer, or dynamical) resonances that result because of a strongly bent region on the multi-mode potential energy surfaces. The calculated rates show reasonable qualitative agreement with the experimental results of Lovejoy and Moore [J. Chem, Phys. 98, 7846 (1993)]. (C) 1995 American Institute of Physics C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Gezelter, J. Daniel/D-1894-2010 OI Gezelter, J. Daniel/0000-0002-2935-3163 NR 26 TC 33 Z9 33 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 8 PY 1995 VL 103 IS 18 BP 7868 EP 7876 DI 10.1063/1.470204 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TC854 UT WOS:A1995TC85400022 ER PT J AU XANTHEAS, SS SUTCLIFFE, BT AF XANTHEAS, SS SUTCLIFFE, BT TI THE HAMILTONIAN FOR A WEAKLY INTERACTING TRIMER OF POLYATOMIC MONOMERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID WATER TRIMER; ABINITIO; MOLECULES; SYSTEMS AB The body-fixed Hamiltonian for a trimer of polyatomic monomers is expressed in terms of the distances between the monomer centers of mass and of the orientation angles of the monomers relative to the body-fixed frame. The particular case where the monomers are water molecules is considered in some detail. In this work we attempt to assess the possibility of using a computer algebra system to aid in the evaluation of the angular matrix elements. (C) 1995 American Institute of Physics. C1 UNIV YORK, DEPT CHEM, YORK YO1 5DD, N YORKSHIRE, ENGLAND. RP XANTHEAS, SS (reprint author), PACIFIC NW LAB, THEORY MODELING & SIMULAT ENVIRONM MOLEC SCI LAB, POB 999, RICHLAND, WA 99352 USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 26 TC 15 Z9 15 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 8 PY 1995 VL 103 IS 18 BP 8022 EP 8030 DI 10.1063/1.470713 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TC854 UT WOS:A1995TC85400039 ER PT J AU NICHOLAS, JB FEYEREISEN, M AF NICHOLAS, JB FEYEREISEN, M TI AN EVALUATION OF CORRELATION-CONSISTENT BASIS-SETS IN CALCULATING THE STRUCTURE AND ENERGETICS OF (H2SI)(2)O, H3SIOH, AND H3SIO- SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; MOLECULAR WAVE-FUNCTIONS; GAUSSIAN-BASIS SETS; SI-O-SI; ABINITIO CALCULATIONS; ELECTROSTATIC POTENTIALS; BENCHMARK CALCULATIONS; SYSTEMATIC SEQUENCES; ELECTRONIC-STRUCTURE; DIATOMIC HYDRIDES AB We studied the structure of disiloxane (H3Si-O-SiH3), silanol (H3Si-OH), and the silanol anion (H3Si-O-) with ab initio molecular orbital theory and the correlation consistent polarized basis sets of Dunning and co-workers. We present results for the correlation consistent polarized valence double zeta (cc-pVDZ), triple zeta (cc-pVTZ), and quadruple zeta [cc-pVQZ(-g)] basis sets. Optimized geometries and energies are given at both the restricted Hartree-Fock (RHF) level and with the inclusion of electron correlation by second order Moller-Plesset perturbation theory (MP2). The correlation consistent basis sets provide a systematic expansion of the orbital basis set, with each set of additional functions adding a similar contribution to the correlation energy. We find that the calculated molecular properties show exponential convergence with increasing basis set size. These calculations answer long-standing questions regarding the structure and barrier to linearization of disiloxane. Results at the highest level of theory [MP2/cc-pVQZ(-g)] for disiloxane gave a Si-O-Si bond angle of 147.0 degrees; a Si-O bond length of 1.641 Angstrom, and a barrier to linearization of 0.4 kcal/mol. All of these values are in excellent agreement with experimental results. Similar calculations for silanol gave a Si-O bond length of 1.655 Angstrom, an O-H bond of 0.955 Angstrom, and a Si-O-H angle of 117.9 degrees. The MP2cc-pVQZ(-g) deprotonation energy (Delta E(0)) for silanol, calculated as the energy difference between silanol and its anion, is -366.6 kcal/mol. The effects of electron correlation at the MP4 level are studied in all three molecules using the cc-pVDZ and cc-pVTZ basis sets. (C) 1995 American Institute of Physics. C1 CRAY RES INC, EAGAN, MN 55121 USA. RP NICHOLAS, JB (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, POB 999, RICHLAND, WA 99352 USA. NR 50 TC 27 Z9 27 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 NOV 8 PY 1995 VL 103 IS 18 BP 8031 EP 8042 DI 10.1063/1.470169 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TC854 UT WOS:A1995TC85400040 ER PT J AU REGER, DL MYERS, SM MASON, SS DARENSBOURG, DJ HOLTCAMP, MW REIBENSPIES, JH LIPTON, AS ELLIS, PD AF REGER, DL MYERS, SM MASON, SS DARENSBOURG, DJ HOLTCAMP, MW REIBENSPIES, JH LIPTON, AS ELLIS, PD TI CD-113 SHIELDING TENSORS OF MONOMERIC CADMIUM COMPOUNDS CONTAINING NITROGEN DONOR ATOMS .2. SYNTHESES, CRYSTAL-STRUCTURES, AND CD-113 NMR-SPECTROSCOPY OF THE 6-COORDINATE COMPLEXES [HB(PZ)(3)]2CD, [HB(3-PHPZ)(3)]2CD, AND [B(PZ)(4)]CD[HB(3-PHPZ)(3)] (PZ=PYRAZOLYL) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SINGLE-CRYSTAL; POLY(PYRAZOLYL)BORATE LIGANDS; POLYPYRAZOLYLBORATE LIGANDS; DILUTE SPINS; DIHYDRATE; IRON(II); SOLIDS; RING AB All possible mixed-ligand complexes of the formula LL'Cd (L, L' = [HB(pz)(3)](-), [HB(3,5-Me(2)pz)(3)](-), [B(pz)(4)](-), [HB(3-Phpz)(3)](-) (pz = pyrazolyl)) were prepared by the reaction of a 1/1/1 molar ratio of the desired ligand salts and CdCl2. The new symmetrical complex [HB(3-Phz)(3)]Cd-2 was prepared from 2 equiv of the ligand salt and CdCl2. The solid state structures of [HB(pz)(3)]Cd-2 (1), [HB(3-Phpz)(3)]Cd-2 (4), and [B(pz)(4)]Cd[HB(3-Phpz)(3)] (10) have been characterized by X-ray crystallography. All three are pseudo-octahedral, but the structures of both 4 and 10 are distorted by a rotational movement of one ligand relative to the other ligand. Because of this rotation with 4 and 10, the trans N-Cd-N bond angles are significantly distorted from 180 degrees, leading to one set of cis, interligand N-Cd-N angles that average 89.3 and 92.4 degrees and another that average 100.6 and 105.7 degrees, respectively. The Cd-N bond distances (average 2.33 Angstrom) for 1 are similar to those observed earlier in the structures of [HB(3,5-Me(2)pz)(3)]Cd-2, [B(pz)(4)](2)nCd and [B(3-Mepz)(4)]Cd-2, but the Cd-N distances are longer in 4 (average 2.39 Angstrom) and in 10 ([HB(3-Phpz)(3)](-) ligand average 2.39 Angstrom and the [B(pz)(4)](-) ligand 2.36 Angstrom. The solution Cd-113 NMR chemical shifts for complexes containing the [HB(Phpz)(3)](-) are substantially more shielded than the other complexes in the series. A regression analysis of the solution Cd-113 NMR chemical shifts for all of these complexes for the shift caused by each ligand relative to Cd(ClO4)(2) shows a good correlation of the calculated and observed chemical shifts of these complexes. These shift values (ligand/ligand shift, delta) are [HB(pz)(3)](-)/97.3, [HB(3,5-Me(2)pz)(3)](-)/101.7, [B(pz)(4)(])-/107.4, and [HB(3-Phpz)(3)](-)/44.9. The principal components of the Cd-113 shielding tenser were determined from CP/MAS data. The sigma(33) element was found to be relatively independent of the Cd-N bond hlgths while the opposite is true of sigma(11). This accounts for the dependence of the shielding anisotropies upon the bond distances. The respective chemical shift anisotropies and asymmetry parameters for 1 (both line shapes), 4, and i10 are -238.7, -228.4, -138.5, and -220.8 ppm and 0.55, 0.65, 0.26, and 0.15 ppm. C1 TEXAS A&M UNIV, DEPT CHEM, COLLEGE STN, TX 77843 USA. PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. RP REGER, DL (reprint author), UNIV S CAROLINA, DEPT CHEM & BIOCHEM, COLUMBIA, SC 29208 USA. RI Darensbourg, Donald/O-5084-2014; OI Darensbourg, Donald/0000-0001-9285-4895; Reger, Daniel/0000-0002-1525-7066 NR 46 TC 30 Z9 30 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 8 PY 1995 VL 117 IS 44 BP 10998 EP 11005 DI 10.1021/ja00149a024 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA TD410 UT WOS:A1995TD41000024 ER PT J AU UNRAU, P JOHNSON, JR AF UNRAU, P JOHNSON, JR TI CAN TETRAPLEX RECOMBINATION MODELS EXPLAIN OBSERVATIONS IN INDUCED MITOTIC GENE CONVERSION SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID SACCHAROMYCES-CEREVISIAE; HOLLIDAY JUNCTIONS; MISMATCH-REPAIR; BASE MISMATCHES; STRAND-EXCHANGE; DNA-SEQUENCES; YEAST; EFFICIENCIES; RESOLUTION; MOLECULES AB Induced mitotic gene conversion studies on the CYC1 gene of yeast have shown that the actual base pair changes, the types of changes (base substitution, deletion or addition) and the distances between mutations all affect gene conversion yields. In crosses between mutations less than four bases apart, gene conversion rates are as low as back mutation rates. The same mutants crossed to alleles more than five bases away may recombine 50-fold more. In crosses between mutations five or more base pairs apart, recombination rates varying by up to ten-fold are observed when comparing mutations at the same codon sites. The actual mutations in crosses affect recombination rates at these distances. The data rules out models in which mutants are repaired independently. Models with large gaps at the initiation site are ruled out if the mutants are within the gap. Recombination models are favoured in which both mutations can interact at a distance to affect the probability of recombination; such interactions may reflect the geometry of the recombinational junctions. The specific interactions proposed are that the actual mutations, and residual mismatches arising on excision resynthesis, affect both the further migration of the recombinational junction, and the probability that excision-repair will detect and correct residual mismatches. Junction models in which interactions are expected include those composed of base tetraplexes. The data is interpreted in terms of these models. Meiotic recombination data is consistent with these models. (C) 1995 Academic Press Limited C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP UNRAU, P (reprint author), ATOM ENERGY CANADA LTD, CHALK RIVER LABS, CHALK RIVER, ON K0J 1J0, CANADA. NR 33 TC 7 Z9 7 U1 0 U2 1 PU ACADEMIC PRESS (LONDON) LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD NOV 7 PY 1995 VL 177 IS 1 BP 73 EP 86 DI 10.1006/jtbi.1995.0226 PG 14 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA TE234 UT WOS:A1995TE23400007 PM 8551751 ER PT J AU LU, ZH TAY, SP CAO, R PIANETTA, P AF LU, ZH TAY, SP CAO, R PIANETTA, P TI THE EFFECT OF RAPID THERMAL N2O NITRIDATION ON THE OXIDE/SI(100) INTERFACE STRUCTURE SO APPLIED PHYSICS LETTERS LA English DT Article ID GATE; DIELECTRICS; NITROGEN AB High-resolution x-ray photoelectron spectroscopy (XPS) was used to study the chemical nature and physical distribution of N in oxynitride films formed by rapid thermal N2O processes (RTPs). High-resolution synchrotron Si 2p core level photoemission spectroscopy (PES) was used to study the oxide/Si(100) interface suboxide structures with and without the presence of N. XPS N Is studies indicated that there are two types of N in the RTP oxynitride films. The chemical bond configuration of the first type of N is similar to that N in Si3N4 and is mainly distributed within the first 1 nm from the interface. The second type of N is distributed mainly outside of the first 1 nm region, and the N is likely bonded to two Si and one oxygen atom. PES studies showed that Si formed suboxides with oxygen at the interface for all oxynitride films. It is found that there is no change in the Si+1 structure while there is a dramatic intensity decrease in the Si+2 and Si+3 peaks with the inclusion of N in the oxide. Both the XPS and PES results are explained in terms of a strain reduction as N is incorporated in the film near the interface region, where Si3N4 functions as a buffer layer which reduces the stress caused by the large Si ''lattice'' mismatch between the bulk Si and the oxide overlayer. About 1/5 of the Si+2 and 1/3 of Si+3 atoms at the SiO2/Si interface has been replaced by the Si3N4 buffer layer at the oxynitride/Si interface. (C) 1995 American Institute of Physics. C1 NO TELECOM ELECT LTD,CTR TELECOM MICROELECTR,NEPEAN,ON K2H 8V4,CANADA. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP LU, ZH (reprint author), NATL RES COUNCIL CANADA,INST MICROSTRUCT SCI,OTTAWA,ON K1A 0R6,CANADA. NR 18 TC 116 Z9 116 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 6 PY 1995 VL 67 IS 19 BP 2836 EP 2838 DI 10.1063/1.114801 PG 3 WC Physics, Applied SC Physics GA TC985 UT WOS:A1995TC98500029 ER PT J AU WOLOSCHAK, GE CHANGLIU, CM AF WOLOSCHAK, GE CHANGLIU, CM TI MODULATION OF EXPRESSION OF GENES ENCODING NUCLEAR PROTEINS FOLLOWING EXPOSURE TO JANUS NEUTRONS OR GAMMA-RAYS SO CANCER LETTERS LA English DT Article DE GAMMA RAYS; JANUS NEUTRONS; NUCLEAR PROTEIN; GENES ID IONIZING-RADIATION; CYTOSKELETAL ELEMENTS; PROTO-ONCOGENE; MESSENGER-RNA; DNA-SYNTHESIS; C-FOS; CELLS; STIMULATION; INDUCTION; JUN AB Previous work has shown that exposure of cells to ionizing radiations causes modulation of a variety of genes, including those encoding c-fos, interleukin-1, tumor necrosis factor, cytoskeletal elements, and many more. The experiments reported herein were designed to examine the effects of either JANUS neutron or gamma-ray exposure on expression of genes encoding nucleus-associated proteins (H4-histone, c-jun, c-myc, Rb, and p53). Cycling Syrian hamster embryo cells were irradiated with varying doses and dose rates of either JANUS fission-spectrum neutrons or gamma-rays; after incubation of the cell cultures for 1 h following radiation exposure, mRNA was harvested and analyzed by Northern blot. Results revealed induction of transcripts for c-jun, H4-histone, and (to a lesser extent) Rb following gamma-ray but not following neutron exposure. Interestingly, expression of c-myc was repressed following gamma-ray but not following neutron exposure. Radiations at different doses and dose rates were compared for each of the genes studied. C1 LOYOLA UNIV,MED CTR,DEPT PATHOL,MAYWOOD,IL 60153. RP WOLOSCHAK, GE (reprint author), ARGONNE NATL LAB,CTR MECH BIOL & BIOTECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 30 TC 15 Z9 16 U1 0 U2 0 PU ELSEVIER SCI PUBL IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3835 J9 CANCER LETT JI Cancer Lett. PD NOV 6 PY 1995 VL 97 IS 2 BP 169 EP 175 DI 10.1016/0304-3835(95)03973-Z PG 7 WC Oncology SC Oncology GA TJ018 UT WOS:A1995TJ01800006 PM 7497459 ER PT J AU THIYAGARAJAN, P CHAIKO, DJ HJELM, RP AF THIYAGARAJAN, P CHAIKO, DJ HJELM, RP TI A NEUTRON-SCATTERING STUDY OF POLY(ETHYLENE GLYCOL) IN ELECTROLYTE-SOLUTIONS SO MACROMOLECULES LA English DT Article ID AQUEOUS POLYMER SYSTEMS; POLYETHYLENE OXIDE; WATER; BEHAVIOR AB The solution microstructure of aqueous (D2O) poly(ethylene glycol) (PEG) solutions was determined as a function of polymer concentration and molecular weight in the presence of salts such as NaNO3, Na2CO3, and Na3PO4. Measurements were made by using small-angle neutron scattering (SANS). In addition, anion effects on biphase formation were investigated by cloud point measurements in H2O and D2O. In the presence of NaNO3, PEG behaves like a random coil with no evidence of aggregation, whereas the presence of either Na3PO4 or Na2CO3 leads to aggregate formation. Furthermore, the aggregate size increased with increasing salt concentration until a discontinuity appeared at the point of biphase formation, where the polymers in the PEG-rich phase form an entangled mesh with loss of chain identity. In the monophasic regime, the aggregates were elongated with a radius of approximately 19 Angstrom and a length which varied with salt type and concentration. Analysis of the effects of electrolytes on the cloud points of PEG in H2O and D2O suggests that its phase behavior in solution is entropy driven. Salt effects on cloud points follow the well-known Hofmeister series. Anions leading to increased structuring of water lower the cloud point, as does the substitution of D2O for H2O. The cloud point data correlate linearly with the change in water entropy upon the addition of electrolytes. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. RI Lujan Center, LANL/G-4896-2012 NR 39 TC 61 Z9 61 U1 1 U2 16 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 6 PY 1995 VL 28 IS 23 BP 7730 EP 7736 DI 10.1021/ma00127a020 PG 7 WC Polymer Science SC Polymer Science GA TD889 UT WOS:A1995TD88900020 ER PT J AU MEDELLINRODRIGUEZ, FJ PHILLIPS, PJ LIN, JS AF MEDELLINRODRIGUEZ, FJ PHILLIPS, PJ LIN, JS TI APPLICATION OF SECONDARY NUCLEATION THEORY TO SEMIRIGID MACROMOLECULES - PEEK, PET, AND PEN SO MACROMOLECULES LA English DT Article ID ANGLE X-RAY; ETHER ETHER KETONE); MELT-CRYSTALLIZED POLYMERS; FREE ENERGY-SIGMA; MOLECULAR-WEIGHT; DIMENSIONAL CRYSTALS; GROWTH-RATE; SCATTERING; BEHAVIOR; POLY(ETHYLENE-TEREPHTHALATE) AB A study of the applicability of secondary nucleation theory to the semirigid macromolecules poly(aryl ether ether ketone) (PEEK), poly(ethylene terephthalate) (PET), and poly(ethylene naphthalenate) (PEN) has been made. The main purpose of the study was to test the latest version of secondary nucleation theory, which permits the estimation of the lateral surface free energy fi om the characteristic ratio, C-proportional to. This was made through a numerical comparison of theoretical and experimental values of the products of the lateral and fold surface free energies sigma sigma(e). The surface free energy products were obtained from the direct application of the latest version of secondary nucleation theory to experimental data and compared to calculated values. Computation of the C-infinity values was made assuming that these macromolecules can be considered as polymeric chains with virtual bonds. Direct evaluations of the fold surface free energy sigma(e) used the well-known expression derived from secondary nucleation theory for the lamellar thickness as a function of supercooling. Other evaluations of sigma and sigma(e) were also made where possible, and they ranged from fundamental (Thomson-Gibbs) to empirical (Thomas-Stavely/Kaelble-Cirlin) methods. The product of surface free energies obtained from analysis of the experimental growth rates was always higher than the calculated values by a significant factor. Better numerical agreement was obtained if the data were analyzed assuming that only regime III was present. However, overall, it was concluded that the latest version of secondary nucleation theory does not quantitatively account for the crystallization behavior of this group of semirigid macromolecules. C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. NR 50 TC 36 Z9 36 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 6 PY 1995 VL 28 IS 23 BP 7744 EP 7755 DI 10.1021/ma00127a022 PG 12 WC Polymer Science SC Polymer Science GA TD889 UT WOS:A1995TD88900022 ER PT J AU CHETYRKIN, KG KUHN, JH STEINHAUSER, M AF CHETYRKIN, KG KUHN, JH STEINHAUSER, M TI QCD CORRECTIONS FROM THE TOP-QUARK TO RELATIONS BETWEEN ELECTROWEAK PARAMETERS UP TO ORDER ALPHA(2)(S) SO PHYSICAL REVIEW LETTERS LA English DT Article ID PRECISION-MEASUREMENTS; MODEL AB The vacuum polarization functions Pi(q(2)) of charged and neutral gauge bosons that arise from top and bottom quark loops lead to important shifts in relations between electroweak parameters that can be measured with ever-increasing precision. The large mass of the top quark allows approximation of these functions through the first two terms of an expansion in M(Z)(2)/M(t)(2). The first three terms of the Taylor series of Pi(q(2)), evaluated analytically up to order alpha(s)(2). Results for the subleading contributions to hr and the effective mixing angle sin(2)<(Theta)over bar> are presented. C1 UNIV KARLSRUHE,INST THEORET TEILCHENPHYS,D-76128 KARLSRUHE,GERMANY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP CHETYRKIN, KG (reprint author), RUSSIAN ACAD SCI,INST NUCL RES,60TH OCTOBER ANNIVERSARY PROSPECT 7A,MOSCOW 117312,RUSSIA. NR 22 TC 95 Z9 95 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 6 PY 1995 VL 75 IS 19 BP 3394 EP 3397 DI 10.1103/PhysRevLett.75.3394 PG 4 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500005 ER PT J AU SUN, Y ZHANG, JY GUIDRY, M AF SUN, Y ZHANG, JY GUIDRY, M TI DELTA-I=4 BIFURCATION WITHOUT EXPLICIT FOURFOLD SYMMETRY SO PHYSICAL REVIEW LETTERS LA English DT Article ID MOMENTUM PROJECTION METHOD; HIGH-SPIN STATES; NUCLEI AB We demonstrate that Delta I = 4 bifurcation can arise from the projected shell model without introducing explicitly either a Y-44 deformation or an I-4 term in the Hamiltonian. If band mixing through the usual two-body Hamiltonian is dominated by a single two-band mixture near the yrast line, a clear staggering can appear. Detailed investigation shows that this staggering is associated with interference effects in the rotation from intrinsic to laboratory coordinate systems. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP SUN, Y (reprint author), OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831, USA. RI Sun, Yang/P-2417-2015 NR 18 TC 40 Z9 42 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 NOV 6 PY 1995 VL 75 IS 19 BP 3398 EP 3401 DI 10.1103/PhysRevLett.75.3398 PG 4 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500006 ER PT J AU BARDEEN, CJ WANG, Q SHANK, CV AF BARDEEN, CJ WANG, Q SHANK, CV TI SELECTIVE EXCITATION OF VIBRATIONAL WAVE-PACKET MOTION USING CHIRPED PULSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID IMPULSIVE EXCITATION; OPTICAL PULSES; SPECTROSCOPY; STATES; BACTERIORHODOPSIN; COMPRESSION; EVOLUTION; DYNAMICS AB Chirped ultrashort pulses are used to selectively excite vibrationally coherent populations ground and excited electronic states of a molecule in liquid solution. Negatively chirped are shown to enhance the nonstationary ground state component, while positively chirped discriminate against its formation. Separation of the ground and excited state contributions signal allows us to obtain state-specific information about the vibrational dephasing. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP BARDEEN, CJ (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 28 TC 231 Z9 233 U1 1 U2 25 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 6 PY 1995 VL 75 IS 19 BP 3410 EP 3413 DI 10.1103/PhysRevLett.75.3410 PG 4 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500009 ER PT J AU BUSCH, K SOUKOULIS, CM AF BUSCH, K SOUKOULIS, CM TI TRANSPORT-PROPERTIES OF RANDOM-MEDIA - A NEW EFFECTIVE-MEDIUM THEORY SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRONGLY SCATTERING MEDIA; CLASSICAL WAVES; DIFFUSION CONSTANT; LIGHT DIFFUSION; SPEED AB We present a new method for efficient, accurate calculations of transport properties of random media. It is based on the principle that the wave energy density should be uniform when averaged over length scales larger than the size of the scatterers. This scheme captures the effects of resonant scattering of the individual scatterer exactly, as well as the multiple scattering in a mean-field sense. It has been successfully applied to both ''scalar'' and ''vector'' classical wave calculations. Results for the energy transport velocity are in agreement with experiment. This approach is of general use and can be easily extended to treat different types of wave propagation in random media. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV KARLSRUHE,INST THEORIE KONDENSIERTEN MAT,D-76128 KARLSRUHE,GERMANY. RP BUSCH, K (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008 NR 18 TC 59 Z9 60 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 NOV 6 PY 1995 VL 75 IS 19 BP 3442 EP 3445 DI 10.1103/PhysRevLett.75.3442 PG 4 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500017 ER PT J AU AHUJA, R ERIKSSON, O WILLS, JM JOHANSSON, B AF AHUJA, R ERIKSSON, O WILLS, JM JOHANSSON, B TI THEORETICAL CONFIRMATION OF THE HIGH-PRESSURE SIMPLE CUBIC PHASE IN CALCIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID ALKALINE-EARTH METALS; CRYSTAL-STRUCTURE; BRILLOUIN-ZONE; SPECIAL POINTS; BAND; TRANSITIONS; SYSTEMS AB The remarkable experimental discovery of the simple cubic (sc) structure in compressed calcium is investigated theoretically by means of first-principles calculations. The calculated transition pressure for the occurrence of the simple cubic phase as well as the associated volume collapse agree very well with experiments. Thus, with increasing pressure calcium shows a unique decrease in the number of nearest neighbors (NN), starting from 12 NN (face centered cubic), via a structure with 8 NN (body centered cubic), into a phase with only 6 NN (simple cubic). We present an explanation for this sequence of structural transitions and predict a similar high pressure behavior for Na and Mg. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP AHUJA, R (reprint author), UNIV UPPSALA,DEPT PHYS,CONDENSED MATTER THEORY GRP,BOX 530,S-75121 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 24 TC 59 Z9 60 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 NOV 6 PY 1995 VL 75 IS 19 BP 3473 EP 3476 DI 10.1103/PhysRevLett.75.3473 PG 4 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500025 ER PT J AU SIGALAS, MM ECONOMOU, EN AF SIGALAS, MM ECONOMOU, EN TI ACOUSTIC BAND-STRUCTURE OF PERIODIC ELASTIC COMPOSITES - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note C1 IOWA STATE UNIV,DEPT PHYS,AMES,IA 50011. RES CTR CRETE FORTH,GR-71110 CRETE,GREECE. UNIV CRETE,DEPT PHYS,GR-71409 CRETE,GREECE. RP SIGALAS, MM (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. RI Economou, Eleftherios /E-6374-2010 NR 9 TC 8 Z9 8 U1 0 U2 13 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 6 PY 1995 VL 75 IS 19 BP 3580 EP 3580 DI 10.1103/PhysRevLett.75.3580 PG 1 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500052 ER PT J AU GAKH, AA SACHLEBEN, RA BRYAN, JC MOYER, BA AF GAKH, AA SACHLEBEN, RA BRYAN, JC MOYER, BA TI A FACILE SYNTHESIS AND X-RAY STRUCTURE DETERMINATION OF THE FIRST TRIPTYCENOCROWN ETHERS SO TETRAHEDRON LETTERS LA English DT Article ID COMPLEXES; TIN(II) AB The synthesis of the first triptycenocrown ethers was achieved by two-step procedure which includes condensation of 9,10-bis(chloromethyl)anthracene with polyethylene glycols to yield the intermediate 9,10-anthracenocrown ethers, and subsequent cycloaddition of benzyne leading to the title compounds. The structures of 9,10-triptyceno-25-crown-7 (1) and its thallium nitrate complex (Tl-1) were determined by X-Ray diffraction analysis and NMR spectroscopy. RP GAKH, AA (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI Solominow, Sonia/A-4021-2008; Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 NR 10 TC 12 Z9 13 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD NOV 6 PY 1995 VL 36 IS 45 BP 8163 EP 8166 DI 10.1016/0040-4039(95)01760-F PG 4 WC Chemistry, Organic SC Chemistry GA TC687 UT WOS:A1995TC68700002 ER PT J AU XUJIA, Z JONAH, CD AF XUJIA, Z JONAH, CD TI TEMPERATURE-DEPENDENCE OF THE BENZOPHENONE ANION SOLVATION IN 1-PROPANOL SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DYNAMICS; ELECTRONS AB The solvation of the benzophenone anion in n-propanol over the temperature range -20 to -50 degrees C was determined from the shift of the benzophenone anion absorption spectrum as a function of time. The anion spectra were the same as those determined at room temperature. The form of the kinetics is the same; the results at the different wavelengths are uniformly slower at lower temperatures. The activation energy for the anion solvation is approximately 22 kJ/mol. This value is greater than the value determined for dipole solvation so that, while benzophenone anion solvation is faster than excited state solvation at room temperatures, it is slower at lower temperatures. RP XUJIA, Z (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 22 TC 6 Z9 6 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 NOV 3 PY 1995 VL 245 IS 4-5 BP 421 EP 426 DI 10.1016/0009-2614(95)01021-Z PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE056 UT WOS:A1995TE05600015 ER PT J AU GENTEMANN, S MEDFORTH, CJ EMA, T NELSON, NY SMITH, KM FAJER, J HOLTEN, D AF GENTEMANN, S MEDFORTH, CJ EMA, T NELSON, NY SMITH, KM FAJER, J HOLTEN, D TI UNUSUAL PICOSECOND (1)(PI,PI-ASTERISK) DEACTIVATION OF RUFFLED NONPLANAR PORPHYRINS SO CHEMICAL PHYSICS LETTERS LA English DT Article AB Time-resolved and steady-state optical data are presented for metal-free meso-tetraalkylporphyrins, H2T(alkyl)P. Introduction of bulky tertiary-butyl or adamantyl substituents at the meso positions induces large ruffling distortions of the macrocycle skeleton that give rise to highly novel photophysical properties of the porphyrins. These include ultrashort (1)(pi, pi*) lifetimes of 10-50 ps at 296 K that, intriguingly, lengthen to 10-15 ns at 78 K, the typical timescale found at both temperatures for planar derivatives such as tetra(n-pentyl) and tetraphenyl porphyrins. The ability of the nonplanar ruffled porphyrins to undergo additional structural deformations in the excited singlet state likely underlies their dramatically enhanced rates of internal conversion. C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. OKAYAMA UNIV,DEPT APPL CHEM,OKAYAMA 700,JAPAN. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP GENTEMANN, S (reprint author), WASHINGTON UNIV,DEPT CHEM,ST LOUIS,MO 63130, USA. RI EMA, Tadashi/B-2103-2011; Medforth, Craig/D-8210-2013; REQUIMTE, FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013; Smith, Kevin/G-1453-2011 OI EMA, Tadashi/0000-0002-2160-6840; Medforth, Craig/0000-0003-3046-4909; Smith, Kevin/0000-0002-6736-4779 NR 19 TC 83 Z9 83 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 3 PY 1995 VL 245 IS 4-5 BP 441 EP 447 DI 10.1016/0009-2614(95)01030-D PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TE056 UT WOS:A1995TE05600019 ER PT J AU SHAPIRO, DB ESQUERRA, RM GOLDBECK, RA BALLAS, SK MOHANDAS, N KLIGER, DS AF SHAPIRO, DB ESQUERRA, RM GOLDBECK, RA BALLAS, SK MOHANDAS, N KLIGER, DS TI CARBON-MONOXIDE RELIGATION KINETICS TO HEMOGLOBIN-S POLYMERS FOLLOWING LIGAND PHOTOLYSIS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID SICKLE-CELL HEMOGLOBIN; SINGULAR VALUE DECOMPOSITION; POLYMERIZATION; GELATION; BINDING; NUCLEATION; MECHANISM; MYOGLOBIN AB The re-equilibration rate of carbon monoxide binding to hemoglobin S polymers is determined by time-resolved measurements of linear dichroism spectra. Linear dichroism is used to detect religation to hemoglobin in the polymer in the presence of rebinding to free hemoglobin S tetramers. Measurement of the linear dichroism resulting from photolysis of the small percentage of ligand bound to the polymer is accomplished through the use of an ultrasensitive, ellipsometric linear dichroism technique developed for this purpose. The major finding is that the return of the polymer phase to its equilibrium ligation state is much slower than that of the solution phase hemoglobin tetramers. Assuming all hemes in the polymer are equally likely to participate in rebinding, the re-equilibration rate for carbon monoxide religation to hemoglobin S polymers is found to be 0.14 +/- 0.07 (s(-1) m(-1)), about 1000 times slower than the rebinding rate of carbon monoxide to T-state monomer hemoglobin. Several interpretations of this result are discussed. An understanding of the ligand binding kinetics to hemoglobin S polymers could have pathophysiological significance in its relevance to polymer formation and melting during red blood cell circulation. C1 UNIV CALIF SANTA CRUZ,DEPT CHEM & BIOCHEM,SANTA CRUZ,CA 95064. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. JEFFERSON MED COLL,DEPT MED,CALDEZA FDN,PHILADELPHIA,PA 19107. FU NHLBI NIH HHS [HL38632, HL31579]; NIGMS NIH HHS [GM35158] NR 48 TC 11 Z9 11 U1 0 U2 2 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD NOV 3 PY 1995 VL 270 IS 44 BP 26078 EP 26085 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA TC978 UT WOS:A1995TC97800015 PM 7592808 ER PT J AU ZHU, Z ESPENSON, JH AF ZHU, Z ESPENSON, JH TI REACTIONS OF ETHYL DIAZOACETATE CATALYZED BY METHYLRHENIUM TRIOXIDE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Note ID METAL-FORMALDEHYDE CHEMISTRY; MAIN-GROUP ELEMENTS; TRANSITION-METALS; MULTIPLE BONDS; METHYLTRIOXORHENIUM; COMPLEX; REACTIVITY; TRANSFORMATIONS; MOLYBDENOCENE; COORDINATION C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 43 TC 80 Z9 81 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD NOV 3 PY 1995 VL 60 IS 22 BP 7090 EP 7091 DI 10.1021/jo00127a008 PG 2 WC Chemistry, Organic SC Chemistry GA TD637 UT WOS:A1995TD63700008 ER PT J AU LUAN, L SONG, JS BULLOCK, RM AF LUAN, L SONG, JS BULLOCK, RM TI IONIC HYDROGENATION OF ALKYNES BY HOTF AND CP(CO)(3)WH SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID ORGANOMETALLIC LEWIS-ACIDS; METAL-COMPLEXES; VINYL; CHEMISTRY; CATIONS; MOLYBDENUM; ALDEHYDES; ANHYDRIDE AB Alkynes can be hydrogenated at room temperature by an ionic hydrogenation method using triflic acid (CF3SO3H) as the proton donor and a transition metal hydride (Cp(CO)(3)WH) as the hydride donor. Reaction of PhC=CH with HOTf and Cp(CO)(3)WH gives ethylbenzene as the final product in high yield. Intermediates observed in this reaction are the vinyl triflate CH2=C(Ph)(OTf) and the geminal ditriflate Ph(CH3)C(OTf)(2), which result from the addition of 1 or 2 equiv of HOTf to the C=C triple bond of the alkyne. Hydrogenation of PhC=CMe by HOTf and Cp(CO)(3)WH similarly produces propylbenzene as the ultimate product. Along with vinyl triflates, additional intermediates observed in this reaction were the cis and trans isomers of the beta-methylstyrene complex [Cp(CO)(3)W-(eta(2)-PhHC=CHCH3)](+)[OTf](-). Hydrogenation of n-butylacetylene to n-hexane does occur upon reaction with HOTf/Cp(CO)(3)WH, but is very slow. In the absence of metal hydrides, 2-methyl-1-buten-3-yne reacts with HOTf to give the vinyl triflate CH2=CMeC(OTf)=CH2, but reaction with HOTf and Cp(CO)(3)WH gives Me(2)C=C(OTf)Me. The key characteristics required for the metal hydride used in these hydrogenations are the ability to donate hydride in the presence of strong acid, and the absence of rapid decomposition of the hydride through reaction with the strong acid. Cp(CO)(3)WH meets these requirements, but HSiEt(3), while an effective hydride donor, is decomposed by HOTf on the time scale of these alkyne hydrogenation reactions. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 28 TC 33 Z9 33 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD NOV 3 PY 1995 VL 60 IS 22 BP 7170 EP 7176 DI 10.1021/jo00127a023 PG 7 WC Chemistry, Organic SC Chemistry GA TD637 UT WOS:A1995TD63700023 ER PT J AU CHIN, RP SHEN, YR PETROVAKOCH, V AF CHIN, RP SHEN, YR PETROVAKOCH, V TI PHOTOLUMINESCENCE FROM POROUS SILICON BY INFRARED MULTIPHOTON EXCITATION SO SCIENCE LA English DT Article ID STATE AB Visible photoluminescence from porous silicon induced by infrared multiphoton excitation was observed at room temperature, Luminescence resulted from carrier excitations in the surface region of the sample. With the pump in the mid-infrared, excitation was effective only when the pump frequency was near resonance with the stretch vibrations of the surface species, SiHx. For each visible photon emitted, at least seven or eight infrared photons were absorbed. The excitation is believed to occur via pumping up a vibrational ladder, followed by conversion to electronic excitation. The process is similar to infrared multiphoton excitation of polyatomic molecules. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,DIV MAT SCI,BERKELEY,CA 94720. TECH UNIV MUNICH,DEPT PHYS,D-85747 GARCHING,GERMANY. TECH UNIV MUNICH,DEPT CHEM,D-85747 GARCHING,GERMANY. NR 10 TC 66 Z9 68 U1 1 U2 9 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 3 PY 1995 VL 270 IS 5237 BP 776 EP 778 DI 10.1126/science.270.5237.776 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TC712 UT WOS:A1995TC71200032 ER PT J AU JOHNSON, SW ECKERT, J BARTHES, M MCMULLAN, RK MULLER, M AF JOHNSON, SW ECKERT, J BARTHES, M MCMULLAN, RK MULLER, M TI CRYSTAL-STRUCTURE OF ACETANILIDE AT 15 AND 295 K BY NEUTRON-DIFFRACTION - LACK OF EVIDENCE FOR PROTON-TRANSFER ALONG THE N-H-CENTER-DOT-CENTER-DOT-CENTER-DOT-O HYDROGEN-BOND SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SCATTERING; SOLITONS; DYNAMICS; SPECTRA AB The crystal structure of acetanilide C8H9NO, M(r) = 135.17, orthorhombic, space group Pbca, Z = 8, has been determined from neutron diffraction data at 15 and 295 K. The following are the crystal data: at 15 K [295 K], a = 19.467(3) [19.615(3)] Angstrom, b = 9.332(1) [9.474(1)] Angstrom, c = 7.735(1) [7.979(1)] Angstrom; V = 1405.2(6) [1482.8(6)] Angstrom(3); D-n = 1.2779(1) [1.2110(5)] g . cm(-3), mu(n), = 2.14 [2.02] cm(-1), F(000) = 277.46 fm, lambda = 1.0462 Angstrom, R(F-2) = 0.047 [0.083], wR(F-2) = 0.060 [0.076], and S = 1.033 [1.000] for 2772 [1596] reflections (sin theta/lambda < 0.79 [0.68] Angstrom(-1)) and 173 variable parameters. This new investigation of the structure of acetanilide has been undertaken in order to assess a recent suggestion that conformational substates in the amide proton position may be responsible for the vibrational anomalies. We found no evidence for multiple conformations or transfer along the N-H ... O hydrogen bond of the amide proton at either temperature. However, the intramolecular O ... H6 distance from O to the nearest phenyl ring proton is unusually short and the amide proton has relatively close contacts with one of the phenyl and one of the methyl protons, which may well affect the vibrational parameters of the respective molecular groups. C1 LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. UNIV MONTPELLIER 2,GDPC,F-34095 MONTPELLIER 5,FRANCE. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. UNIV LILLE 1,DSCM,F-59655 VILLENEUVE DASCQ,FRANCE. NR 41 TC 53 Z9 53 U1 3 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 2 PY 1995 VL 99 IS 44 BP 16253 EP 16260 DI 10.1021/j100044a009 PG 8 WC Chemistry, Physical SC Chemistry GA TD478 UT WOS:A1995TD47800009 ER PT J AU PERMANA, H NG, KYS PEDEN, CHF SCHMIEG, SJ BELTON, DN AF PERMANA, H NG, KYS PEDEN, CHF SCHMIEG, SJ BELTON, DN TI EFFECT OF NO PRESSURE ON THE REACTION OF NO AND CO OVER RH(111) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SUPPORTED RHODIUM CATALYSTS; KINETICS; REDUCTION; OXIDATION; RH(100); CO-O2 AB We have examined the reaction of NO with CO over a Rh(111) catalyst under conditions of both low (0.8 Torr) and high (8 Torr) NO pressures. Our results show that the same three products are formed (CO2, N2O, and N-2) regardless of the NO pressure employed. However, the selectivity of the reaction and the E(a) for product formation are profoundly affected when the NO pressure is lowered by tenfold. For high NO pressures the selectivity is insensitive to either NO pressure (1 Torr < P-NO < 40 Torr) or reaction temperature (T < 673 K). In sharp contrast to this high-pressure behavior, when the NO pressure is lowered to 0.8 Torr, then the selectivity is a strong function of reaction temperature, with N2O being the major product below 635 K and N-2 the major product above 635 K. It is exactly this switch over in selectivity at elevated temperature that has always been seen over low-loaded Rh/Al2O3 catalysts but until this time not reported for single-crystal catalysts. On the basis of our new results we can say that Rh(111) has the characteristic selectivity behavior of practical Rh/Al2O3 catalysts. These results are encouraging because they show that the mechanistic insight we gain over Rh(111) is more broadly applicable to supported catalysts than was previously thought. C1 GM CORP, NAO R&D CTR, DEPT CHEM PHYS, WARREN, MI 48009 USA. WAYNE STATE UNIV, DEPT CHEM ENGN, DETROIT, MI 48202 USA. PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. OI Schmieg, Steven/0000-0002-1507-207X; Peden, Charles/0000-0001-6754-9928; Ng, K Y Simon/0000-0002-7578-487X NR 20 TC 46 Z9 46 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 2 PY 1995 VL 99 IS 44 BP 16344 EP 16350 DI 10.1021/j100044a022 PG 7 WC Chemistry, Physical SC Chemistry GA TD478 UT WOS:A1995TD47800022 ER PT J AU VANCAMPEN, DG HRBEK, J AF VANCAMPEN, DG HRBEK, J TI SILVER ON ALUMINA - ADSORPTION AND DESORPTION STUDY OF MODEL CATALYSTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID THERMAL-DESORPTION; HIGH-RESOLUTION; SURFACES; AG; AU; SPECTROSCOPY; STICKING; FILMS; RU(001); LAYERS AB The initial sticking probabilities of silver on an alumina thin film and an alpha-Al2O3 Single crystal were measured in the temperature range 100-1100 K and compared with measurements on Ru metal surfaces. On the oxides the initial sticking probability is lower than on the metal or oxygen-treated metal surfaces. Thermal desorption spectra of Ag adsorbed on these surfaces were measured for coverages ranging from submonolayer to multilayer. In contrast to the desorption behavior of silver from Ru(001) and Ru(001)-O(2x2) surfaces, the Ag desorption spectra from both alumina surfaces are strikingly different. The complete analysis of Ag desorption data from alumina yields the activation energy for desorption that is smaller than the Ag sublimation heat, and a fractional order process for apparent Ag coverages to 60 ML. Isothermal measurements of Ag/alumina film confirmed these results. Identical adsorption/desorption behavior of Ag on both alumina surfaces shows that the thin film alumina surface is a viable model of an alpha-alumina support. C1 BROOKHAVEN NATL LAB,DEPT CHEM 555,UPTON,NY 11973. RI Hrbek, Jan/I-1020-2013 NR 37 TC 23 Z9 23 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 2 PY 1995 VL 99 IS 44 BP 16389 EP 16394 DI 10.1021/j100044a029 PG 6 WC Chemistry, Physical SC Chemistry GA TD478 UT WOS:A1995TD47800029 ER PT J AU HJELM, RP SCHTEINGART, C HOFMANN, AF SIVIA, DS AF HJELM, RP SCHTEINGART, C HOFMANN, AF SIVIA, DS TI FORM AND STRUCTURE OF SELF-ASSEMBLING PARTICLES IN MONOOLEIN-BILE SALT MIXTURES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ANGLE NEUTRON-SCATTERING; ELASTIC LIGHT-SCATTERING; BILIARY LIPID SYSTEMS; NUCLEAR MAGNETIC-RESONANCE; VESICLE-MICELLE TRANSITION; MOLECULAR-ORGANIZATION; MAXIMUM-ENTROPY; PHASE-BEHAVIOR; MIXED MICELLES; CHOLATE-WATER AB We studied particle morphology in the isotropic part of the bile salt-monoolein-water phase map using small-angle neutron scattering. The bile salts used in this work are cholylglycine and chenodeoxycholylglycine. These systems are models for particle form and molecular arrangement in intestinal content when bile components are replaced by hydrolysis products of dietary triglycerides. We found that the molecular arrangement of the particles present is qualitatively the same as that in the bile salt-phosphatidylcholine systems. This result indicated that the particle morphology is conserved when the products of dietary triglyceride hydrolysis are incorporated, suggesting that the form of bile particle morphology is retained. These observations suggested further that the bile salt and the presence of a hydrocarbon chain are the most important determinants of the functional form of the bile particles, as the monoglyceride is a single-tailed, nonionic surfactant; as opposed to the phosphatidylcholines, which are two-tailed, zwitterionic surfactants. C1 UNIV CALIF SAN DIEGO,DEPT COLL MED,DEPT MED,LA JOLLA,CA 92093. RUTHERFORD APPLETON LAB,ISIS FACIL,CHILTON OX11 0QX,ENGLAND. RP HJELM, RP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545, USA. RI Lujan Center, LANL/G-4896-2012 NR 55 TC 18 Z9 18 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 2 PY 1995 VL 99 IS 44 BP 16395 EP 16406 DI 10.1021/j100044a030 PG 12 WC Chemistry, Physical SC Chemistry GA TD478 UT WOS:A1995TD47800030 ER PT J AU BRENAN, JM SHAW, HF RYERSON, FJ AF BRENAN, JM SHAW, HF RYERSON, FJ TI EXPERIMENTAL-EVIDENCE FOR THE ORIGIN OF LEAD ENRICHMENT IN CONVERGENT-MARGIN MAGMAS SO NATURE LA English DT Article ID CONTINENTAL-CRUST; OCEANIC BASALTS; MANTLE; EARTH; GEOCHEMISTRY; PB; AMPHIBOLITES; EVOLUTION; SEDIMENTS; MINERALS AB IT has been proposed(1-5) that the low Ce/Pb ratio of subduction-related basalts, relative to their oceanic counterparts, arises by the preferential transfer of lead to the mantle wedge (overlying the subducting stab) by non-magmatic processes. Fluxing of the mantle wedge by low-Ce/Pb fluids, generated by the dehydration of subducted oceanic crust, is one mechanism favoured for this process (see, for example, ref. 5). Here we report the results of a series of high-pressure experiments, which confirm that low-Ce/Pb fluids coexist with the dominant mineral phases (garnet and clinopyroxene) produced during high-pressure dehydration of altered basalt. Our results show that the production of subduction-zone magmas from mantle sources fluxed by basalt-derived fluid is a mechanism by which relatively lead-rich, cerium-poor, mantle-derived material is added to the continents. The lead enrichment of the Earth's continental crust is thus a continuing process occurring at convergent margins. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94551. RP BRENAN, JM (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV EARTH SCI,POB 808,L-202,LIVERMORE,CA 94551, USA. RI Shaw, Henry/B-6445-2012 OI Shaw, Henry/0000-0003-0681-5430 NR 20 TC 127 Z9 137 U1 0 U2 11 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 2 PY 1995 VL 378 IS 6552 BP 54 EP 56 DI 10.1038/378054a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TC469 UT WOS:A1995TC46900046 ER PT J AU ALBRECHT, R ANTONENKO, V AWES, TC BARLAG, C BERGER, F BLOOMER, MA BLUME, C BOCK, D BOCK, R BOHNE, EM BUCHER, D CLAUSSEN, A CLEWING, G DEBBE, R DRAGON, L EKLUND, A FOKIN, S GARPMAN, S GLASOW, R GUSTAFSSON, HA GUTBROD, HH HANSEN, O HOLKER, G IDH, J IPPOLITOV, M JACOBS, P KAMPERT, KH KARADJEV, K KOLB, BW LEBEDEV, A LOHNER, H LUND, I MANKO, V MOSKOWITZ, B NIKOLAEV, S OBENSHAIN, E OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M ROTERS, B SANTO, R SCHMIDT, HR SODERSTROM, K SORENSEN, SP STANKUS, P STEFFENS, K STEINHAEUSER, P STENLUND, E STUKEN, D VINOGRADOV, A WEGNER, H YOUNG, GR AF ALBRECHT, R ANTONENKO, V AWES, TC BARLAG, C BERGER, F BLOOMER, MA BLUME, C BOCK, D BOCK, R BOHNE, EM BUCHER, D CLAUSSEN, A CLEWING, G DEBBE, R DRAGON, L EKLUND, A FOKIN, S GARPMAN, S GLASOW, R GUSTAFSSON, HA GUTBROD, HH HANSEN, O HOLKER, G IDH, J IPPOLITOV, M JACOBS, P KAMPERT, KH KARADJEV, K KOLB, BW LEBEDEV, A LOHNER, H LUND, I MANKO, V MOSKOWITZ, B NIKOLAEV, S OBENSHAIN, E OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M ROTERS, B SANTO, R SCHMIDT, HR SODERSTROM, K SORENSEN, SP STANKUS, P STEFFENS, K STEINHAEUSER, P STENLUND, E STUKEN, D VINOGRADOV, A WEGNER, H YOUNG, GR TI PRODUCTION OF ETA-MESONS IN 200 A GEV/C S+S AND S+AU REACTIONS SO PHYSICS LETTERS B LA English DT Article ID INTERSECTING STORAGE-RINGS; LARGE TRANSVERSE-MOMENTUM; PP-COLLISIONS; PI-P; INCLUSIVE PRODUCTION; CERN; SPECTRA; DISTRIBUTIONS; CALORIMETER; HADRONS AB Minimum Bias production cross sections of eta mesons have been measured in 200 A GeV/c S+Au and S+S collisions at the CERN SPS by reconstructing the eta --> gamma gamma decay. The measurements have been made over the rapidity range 2.1 less than or equal to gamma less than or equal to 2.9 using the leadglass spectrometer of WA80. Within the statistical and systematical uncertainties the spectral shapes of pi(0) and eta mesons yields are identical when their invariant differential cross section is plotted as a function of the transverse mass. The relative normalization of the eta to pi(0) transverse mass spectra is found to be 0.53 +/- 0.07 for S+Au and 0.43 +/- 0.15 for S+S reactions. Extrapolation to full phase space leads to an integrated cross section ratio of eta to pi(0) mesons of 0.147 +/- 0.017(stat.) +/- 0.015(syst.), and 0.120 +/- 0.034(stat.) +/- 0.022(syst.) for S+Au and S+S collisions, respectively. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LUND UNIV,S-22362 LUND,SWEDEN. UNIV MUNSTER,D-48149 MUNSTER,GERMANY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. BROOKHAVEN NATL LAB,UPTON,NY 11973. RUSSIAN RES CTR,KURCHATOV INST,MOSCOW 123182,RUSSIA. UNIV GRONINGEN,KVI,9747 AA GRONINGEN,NETHERLANDS. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP ALBRECHT, R (reprint author), GESELL SCHWERIONENFORSCH MBH,D-64220 DARMSTADT,GERMANY. RI Peitzmann, Thomas/K-2206-2012; Lohner, Herbert/B-2397-2014 OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X NR 39 TC 35 Z9 35 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 NOV 2 PY 1995 VL 361 IS 1-4 BP 14 EP 20 DI 10.1016/0370-2693(95)01166-N PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TD136 UT WOS:A1995TD13600004 ER PT J AU TSO, K PHAIR, L COLONNA, N SKULSKI, W WOZNIAK, GJ MORETTO, LG BOWMAN, DR CHARTIER, M GELBKE, CK GONG, WG HSI, WC KIM, YD LISA, MA LYNCH, WG PEASLEE, GF SCHWARZ, C DESOUZA, RT TSANG, MB ZHU, F AF TSO, K PHAIR, L COLONNA, N SKULSKI, W WOZNIAK, GJ MORETTO, LG BOWMAN, DR CHARTIER, M GELBKE, CK GONG, WG HSI, WC KIM, YD LISA, MA LYNCH, WG PEASLEE, GF SCHWARZ, C DESOUZA, RT TSANG, MB ZHU, F TI EVIDENCE FOR THE REDUCIBILITY OF MULTIFRAGMENT EMISSION TO AN ELEMENTARY BINARY EMISSION IN XE-INDUCED REACTIONS SO PHYSICS LETTERS B LA English DT Article ID ARRAY AB Multifragmentation for Xe-129-induced reactions on several targets (Cu-nat, Y-89, Ho-165, Au-197) has been studied at E/A = 40, 50 and 60 MeV. The probability of emitting n intermediate mass fragments is shown to be binomial at each transversal energy and reducible to an elementary binary probability p. For each target and at each bombarding energy, p shows a thermal behavior as demonstrated by linear Arrhenius plots. A nearly universal linear Arrhenius plot is observed at each bombarding energy, independent of target. The sensitivity of p to the Z(threshold) points to its physical significance and rules out auto-correlation effects. C1 MICHIGAN STATE UNIV,NATL SUPERCOND CYCLOTRON LAB,E LANSING,MI 48824. RP TSO, K (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Lynch, William/I-1447-2013; deSouza, Romualdo/P-5862-2015 OI Lynch, William/0000-0003-4503-176X; deSouza, Romualdo/0000-0001-5835-677X NR 13 TC 25 Z9 26 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 2 PY 1995 VL 361 IS 1-4 BP 25 EP 30 DI 10.1016/0370-2693(95)01137-F PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TD136 UT WOS:A1995TD13600006 ER PT J AU ALFORD, M DIMM, W LEPAGE, GP HOCKNEY, G MACKENZIE, PB AF ALFORD, M DIMM, W LEPAGE, GP HOCKNEY, G MACKENZIE, PB TI LATTICE QCD ON SMALL COMPUTERS SO PHYSICS LETTERS B LA English DT Article ID YANG-MILLS THEORY; CONTINUUM-LIMIT; GAUGE-THEORIES AB We demonstrate that lattice QCD calculations can be made 10(3)-10(6) times faster by using very coarse lattices. To obtain accurate results, we replace the standard lattice actions by perturbatively-improved actions with tadpole-improved correction terms that remove the leading errors due to the lattice. To illustrate the power of this approach, we calculate the static-quark potential, and the charmonium spectrum and wavefunctions using a desktop computer. We obtain accurate results that are independent of the lattice spacing and agree well with experiment. C1 FERMILAB NATL ACCELERATOR LAB, DEPT THEORET PHYS, BATAVIA, IL 60510 USA. RP CORNELL UNIV, FLOYD R NEWMAN LAB NUCL STUDIES, ITHACA, NY 14853 USA. NR 24 TC 169 Z9 169 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 2 PY 1995 VL 361 IS 1-4 BP 87 EP 94 DI 10.1016/0370-2693(95)01131-9 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TD136 UT WOS:A1995TD13600016 ER PT J AU BERGER, EL CONTOPANAGOS, H AF BERGER, EL CONTOPANAGOS, H TI PERTURBATIVE GLUON RESUMMATION OF THE TOP-QUARK PRODUCTION CROSS-SECTION SO PHYSICS LETTERS B LA English DT Article ID HADRON HADRON-COLLISIONS; QCD CORRECTIONS; HEAVY; ORDER AB We present a calculation of the total cross section for top quark production based on a new perturbative resummation of gluon radiative corrections to the basic QCD subprocesses. We use Principal Value Resummation to calculate all relevant large threshold corrections. Advantages of this method include its independence from arbitrary infrared cutoffs and specification of the perturbative regime of applicability. For p (p) over bar collisions at center-of-mass energy root s = 1.8 TeV and a top mass of 175 GeV, we compute sigma(t (t) over bar) = 5.52(-0.45)(+0.07) pb. RP BERGER, EL (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 28 TC 90 Z9 90 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 NOV 2 PY 1995 VL 361 IS 1-4 BP 115 EP 120 DI 10.1016/0370-2693(95)01133-B PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TD136 UT WOS:A1995TD13600020 ER PT J AU HUANG, Z AF HUANG, Z TI THERMAL DILEPTON EMISSION RATE IN TERMS OF SPECTRAL FUNCTIONS SO PHYSICS LETTERS B LA English DT Article ID QUARK-GLUON PLASMA; FINITE-TEMPERATURE; E+E ANNIHILATION; CROSS-SECTION; PHOTON AB We interpret the dilepton emission rate from a hadronic gas expected to be produced in heavy ion collisions in terms of the spectral functions available from the e(+)e(-) annihilation and the tau lepton decay experiments. We take into account all possible hadronic states especially the multi-pion contributions to the dilepton emission and the parity mixing phenomenon due to the soft final-state corrections. A new compilation of the experimental data for the spectral functions is presented. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. NR 36 TC 28 Z9 28 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 NOV 2 PY 1995 VL 361 IS 1-4 BP 131 EP 136 DI 10.1016/0370-2693(95)01036-P PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TD136 UT WOS:A1995TD13600022 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P ANYKEYEV, V APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENKE, T BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BURGSMUELLER, T BUSCHMANN, P BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIBBS, M GOKIELI, R GOLO, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PINDO, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K RYBIN, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEAGER, P SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SPONHOLZ, P SQUARCIA, S STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, E VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHIGUNOV, V ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P ANYKEYEV, V APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENKE, T BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BURGSMUELLER, T BUSCHMANN, P BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIBBS, M GOKIELI, R GOLO, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PINDO, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K RYBIN, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEAGER, P SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SPONHOLZ, P SQUARCIA, S STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, E VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHIGUNOV, V ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G TI MEASUREMENT OF DELTA(++)(1232) PRODUCTION IN HADRONIC-Z-DECAYS SO PHYSICS LETTERS B LA English DT Article ID E+E ANNIHILATIONS AB A measurement of the Delta(++)(1232) inclusive production in hadronic decays of the Z at LEP is presented, based on 1.3 million hadronic events collected by the DELPHI detector in the 1994 LEP running period. The DELPHI ring imaging Cherenkov counters are used for identifying hadrons. The average Delta(++)(1232) multiplicity per hadronic event is 0.079 +/- 0.015 which is more than a factor of two below the JETSET, HERWIG and UCLA model predictions. It agrees with a recently proposed universal mass dependence of particle production rates in e(+)e(-) annihilations. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. FREE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,BRATISLAVA 84215,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV STRASBOURG 1,CTR RECH NUCL,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. ACAD SCI CZECH REPUBL,INST PHYS,FZU,DIV HIGH ENERGY PHYS,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENEVA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,CNRS,IN2P3,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,CNRS,IN2P3,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. IST NAZL FIS NUCL,I-00173 ROME,ITALY. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. STOCKHOLM UNIV,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. CSIC,IFIC,VALENCIA,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,PL-00681 WARSAW,POLAND. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA 14-10,P-1000 LISBON,PORTUGAL. RI Pimenta, Mario/M-1741-2013; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Michelotto, Michele/A-9571-2013; Mundim, Luiz/A-1291-2012; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Navas, Sergio/N-4649-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017 OI Pimenta, Mario/0000-0002-2590-0908; Ragazzi, Stefano/0000-0001-8219-2074; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Michelotto, Michele/0000-0001-6644-987X; Mundim, Luiz/0000-0001-9964-7805; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Navas, Sergio/0000-0003-1688-5758; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368 NR 24 TC 18 Z9 18 U1 0 U2 4 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 NOV 2 PY 1995 VL 361 IS 1-4 BP 207 EP 220 DI 10.1016/0370-2693(95)01176-Q PG 14 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA TD136 UT WOS:A1995TD13600032 ER PT J AU SCHRYVERS, D MA, Y TOTH, L TANNER, L AF SCHRYVERS, D MA, Y TOTH, L TANNER, L TI ELECTRON-MICROSCOPY STUDY OF THE FORMATION OF NI5AL3 IN A NI62.5AL37.5 B2 ALLOY .1. PRECIPITATION AND GROWTH SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID THERMOELASTIC MARTENSITIC-TRANSFORMATION; NI-AL ALLOYS; PHASE; MICROSTRUCTURES; IMAGES; ORDER AB The formation and growth of Ni5Al3 precipitates found inside an annealed B2 matrix in Ni62.5Al37.5 samples is described on the basis of conventional and high resolution electron microscopy images and electron diffraction patterns. Short anneals introduce three-pointed star shaped precipitates consisting of twin related segments with different variants of the Ni5Al3 structure. Longer anneals result in separate plates growing from these wings and developing microtwinning in order to accommodate stress built-up at the interfaces with the surrounding matrix. Two different growth mechanisms were observed and are discussed. The lattice distortions are found to be much higher in the small precipitates than in the large microtwinned plates. C1 MFKI, H-1325 BUDAPEST, HUNGARY. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP SCHRYVERS, D (reprint author), UNIV ANTWERP, RUCA, EMAT, GROENENBORGERLAAN 171, B-2020 ANTWERP, BELGIUM. NR 35 TC 27 Z9 28 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD NOV PY 1995 VL 43 IS 11 BP 4045 EP 4056 DI 10.1016/0956-7151(95)00101-Z PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA332 UT WOS:A1995TA33200014 ER PT J AU SCHRYVERS, D MA, Y TOTH, L TANNER, L AF SCHRYVERS, D MA, Y TOTH, L TANNER, L TI ELECTRON-MICROSCOPY STUDY OF THE FORMATION OF NI5AL3 IN A NI62.5AL37.5 B2 ALLOY .2. PLATE CRYSTALLOGRAPHY SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID THERMOELASTIC MARTENSITIC-TRANSFORMATION; NI-AL ALLOYS AB Different twinning arrangements in Ni5Al3 plates grown inside the B2 phase in Ni62.5Al37.5 samples are described on the basis of conventional and high resolution electron microscopy images and electron diffraction. The plate morphology is comparable with that of pure 2M martensite plates. The choice of ordered variants within a plate is dictated by the ordering coherency of the twin plane. No dislocations were observed at the primary plate-matrix interfaces. An explanation using the streaking due to aperiodic twinning is given for unexpected reflections. C1 MFKI, H-1325 BUDAPEST, HUNGARY. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP SCHRYVERS, D (reprint author), UNIV ANTWERP, RUCA, EMAT, GROENENBORGERLAAN 171, B-2020 ANTWERP, BELGIUM. NR 11 TC 12 Z9 12 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD NOV PY 1995 VL 43 IS 11 BP 4057 EP 4065 DI 10.1016/0956-7151(95)00102-2 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA332 UT WOS:A1995TA33200015 ER PT J AU RAWERS, JC MAURICE, D AF RAWERS, JC MAURICE, D TI UNDERSTANDING MECHANICAL INFUSION OF NITROGEN INTO IRON POWDERS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID ALLOYS AB Nitrogen alloying of iron-based metals greatly improves mechanical and corrosion properties. However, nitrogen solubility is less than 0.1 weight percent (wt%) in b.c.c, iron. In this study nitrogen concentrations in excess of 1 wt% were obtained by high-energy milling of pure iron powders in a nitrogen gas environment. The nitrogen concentration in the powder, the grain size, and internal strain in the mechanically processed iron powder were determined as functions of processing time in both nitrogen and argon gas environments. The contributions of plastic deformation and interstitial nitrogen to changes in lattice d-spacing, and the distribution of nitrogen between interstitial sites and defect sites were estimated. Approximately 25% of the incorporated nitrogen was contained in interstitial sites, with the remainder associated with defect structures and surfaces. RP RAWERS, JC (reprint author), US BUR MINES, ALBANY RES CTR, ALBANY, OR 97321 USA. NR 18 TC 18 Z9 21 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD NOV PY 1995 VL 43 IS 11 BP 4101 EP 4107 DI 10.1016/0956-7151(95)00106-6 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA332 UT WOS:A1995TA33200020 ER PT J AU YOSHIMI, K HANADA, S YOO, MH AF YOSHIMI, K HANADA, S YOO, MH TI YIELDING AND PLASTIC-FLOW BEHAVIOR OF B2-TYPE FE-39.5 MOL.PERCENT AL SINGLE-CRYSTALS IN COMPRESSION SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID FE-AL; TEMPERATURE-DEPENDENCE; DEFORMATION-BEHAVIOR; SLIP DIRECTIONS; COOLING RATE; BETA-CUZN; ALLOYS; STRESS; STOICHIOMETRY; FRACTURE AB Yielding and plastic flow behavior of B2-type Fe-39.5 mol.% Al were investigated by deforming single crystals in the temperature range from room temperature to 1073 K. Yield stress exhibits a distinct positive temperature dependence followed by a peak for all the orientations examined. The temperatures of the anomalous peak are located between 823 and 873 K for all the orientations except the near-[($) over bar 111] orientation. Only for the near-[($) over bar 111] orientation the peak temperature is located between 773 and 823 K. The slip transition from [111] direction at intermediate temperatures to [100] at high temperatures occurs at the peak temperatures. The yield stress at 773 K exhibits a strong orientation dependence and has a good correlation with respect to non-glide stress component. Specimens having compression axes of chi greater than or equal to 0 degrees exhibit serrations in stress-strain curves below the peak temperatures, whereas the serrations are not observed in those of chi < 0 degrees. In addition, a yield drop is observed around the peak temperatures for all the orientations. Below the peak temperatures, even as low as at room temperature, the yield stress hardly depends on the applied strain rate. This indicates that the motion of [111]-type superdislocations has very small strain-rate sensitivity in the temperature range. On the other hand, there is a strong strain-rate dependence at the peak temperature and above, indicating that the motion of [100]-type dislocations is strongly rate sensitive. The positive temperature dependence of yield stress in B2 FeAl is discussed on the basis of the present results. C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RP YOSHIMI, K (reprint author), TOHOKU UNIV, INST MAT RES, SENDAI, MIYAGI 98077, JAPAN. NR 41 TC 68 Z9 68 U1 2 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD NOV PY 1995 VL 43 IS 11 BP 4141 EP 4151 DI 10.1016/0956-7151(95)00098-G PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA332 UT WOS:A1995TA33200024 ER PT J AU ZHU, JG PALMSTROM, CJ CARTER, CB AF ZHU, JG PALMSTROM, CJ CARTER, CB TI MISFIT DISLOCATIONS AT ERAS/GAAS HETEROJUNCTIONS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID GAAS; ERAS; (100)GAAS; GROWTH; LAYERS AB Misfit dislocations at the ErAs/GaAs interfaces grown by molecular-beam epitaxy have been investigated using the weak-beam technique of transmission electron microscopy (TEM). The observed dislocation configurations are significantly different from those at heterojunctions between ''diamond-cubic'' structured materials. Networks of nearly orthogonal dislocation, with dislocations lying approximately along [010] and [001] dislocations, and honeycomb-like dislocation networks have been observed. The dislocation density increases as the ErAs layer thickness increases. Different dislocation reactions between the a/2[110] type dislocations, which result in complex dislocation configurations, are discussed. Slight misalignment of the epilayer with respect to the substrate is possible if there are uneven distributions of inclined Burgers vectors in different orientations or screw components in the dislocation network at the interface. C1 UNIV MINNESOTA, DEPT CHEM ENGN & MAT SCI, MINNEAPOLIS, MN 55455 USA. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. BELLCORE, RED BANK, NJ 07701 USA. RI Carter, C. Barry/E-6478-2010 OI Carter, C. Barry/0000-0003-4251-9102 NR 19 TC 3 Z9 3 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD NOV PY 1995 VL 43 IS 11 BP 4171 EP 4177 DI 10.1016/0956-7151(95)00109-9 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA332 UT WOS:A1995TA33200027 ER PT J AU STALLINGA, P WALUKIEWICZ, W WEBER, ER BECLA, P LAGOWSKI, J AF STALLINGA, P WALUKIEWICZ, W WEBER, ER BECLA, P LAGOWSKI, J TI ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF SE-DOPED ALSB - EVIDENCE FOR NEGATIVE-U OF THE DX CENTER SO ACTA PHYSICA POLONICA A LA English DT Article; Proceedings Paper CT XXIV International School on Physics of Semiconducting Compounds CY MAY 27-JUN 02, 1995 CL JASZOWIEC, POLAND SP Polish Acad Sci Warsaw, Inst Phys, Warsaw Univ, Fac Phys, Polish Acad Sci Warsaw, High Pressure Res Ctr ID PERSISTENT PHOTOCONDUCTIVITY; LATTICE-RELAXATION AB A metastable electron paramagnetic resonance signal is observed in Se doped AlSb. After illumination a strong, persistent electron paramagnetic resonance signal with an isotropic g-factor of 1.949 is observed. The absence of any electron paramagnetic resonance when cooled in the dark is direct evidence for the negative-U model. The electron paramagnetic resonance arises from the effective-mass state of the defect, which is not filled at thermal equilibrium. An analysis of the lineshape reveals that the linewidth is determined by hyperfine interactions. The extend of the wave function is found to be comparable to the prediction for the effective-mass state. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. MIT,DEPT MAT SCI,CAMBRIDGE,MA 02139. UNIV S FLORIDA,CTR MICROELECTR RES,TAMPA,FL 33620. RP STALLINGA, P (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 11 TC 1 Z9 1 U1 1 U2 1 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4246 J9 ACTA PHYS POL A JI Acta Phys. Pol. A PD NOV PY 1995 VL 88 IS 5 BP 1043 EP 1047 PG 5 WC Physics, Multidisciplinary SC Physics GA TJ684 UT WOS:A1995TJ68400053 ER PT J AU Orth, JE Sikka, VK AF Orth, JE Sikka, VK TI Commercial casting of nickel aluminide alloys SO ADVANCED MATERIALS & PROCESSES LA English DT Article C1 United Def LP, Steel Prod Div, Anniston, AL 36202 USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Orth, JE (reprint author), United Def LP, Steel Prod Div, 2101 W 10th St,Box 1030, Anniston, AL 36202 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 USA SN 0882-7958 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD NOV PY 1995 VL 148 IS 5 BP 33 EP 34 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA V3036 UT WOS:000169112100007 ER PT J AU WAYMAN, TR MILLER, LS MIGLIORE, PG AF WAYMAN, TR MILLER, LS MIGLIORE, PG TI APPLICATION OF WIND-TURBINE AERO CONTROLS TO AIRCRAFT SO AEROSPACE ENGINEERING LA English DT Article C1 NATL RENEWABLE ENERGY LAB,WASHINGTON,DC. RP WAYMAN, TR (reprint author), WICHITA STATE UNIV,WICHITA,KS 67208, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC AUTOMOTIVE ENG INC PI WARRENDALE PA 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096 SN 0736-2536 J9 AEROSPACE ENG JI Aerosp. Eng. PD NOV PY 1995 VL 15 IS 11 BP 21 EP 24 PG 4 WC Engineering, Aerospace SC Engineering GA TF106 UT WOS:A1995TF10600013 ER PT J AU ROSENBERG, NJ MCKENNEY, MS AF ROSENBERG, NJ MCKENNEY, MS TI SENSITIVITY OF SOME POTENTIAL EVAPOTRANSPIRATION ESTIMATION METHODS TO CLIMATE-CHANGE - REPLY SO AGRICULTURAL AND FOREST METEOROLOGY LA English DT Note C1 EA ENGN SCI & TECHNOL,LINCOLN,NE 68588. RP ROSENBERG, NJ (reprint author), PNL,BATTELLE,WASHINGTON,DC 20024, USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1923 J9 AGR FOREST METEOROL JI Agric. For. Meteorol. PD NOV PY 1995 VL 77 IS 1-2 BP 127 EP 129 DI 10.1016/0168-1923(95)02240-X PG 3 WC Agronomy; Forestry; Meteorology & Atmospheric Sciences SC Agriculture; Forestry; Meteorology & Atmospheric Sciences GA TE620 UT WOS:A1995TE62000009 ER PT J AU SIEPEL, AC HALPERN, AL MACKEN, C KORBER, BTM AF SIEPEL, AC HALPERN, AL MACKEN, C KORBER, BTM TI A COMPUTER-PROGRAM DESIGNED TO SCREEN RAPIDLY FOR HIV TYPE-1 INTERSUBTYPE RECOMBINANT SEQUENCES SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Note C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. OI Siepel, Adam/0000-0002-3557-7219; Korber, Bette/0000-0002-2026-5757 FU NIAID NIH HHS [3-Y01-AI-70001-13] NR 11 TC 116 Z9 118 U1 1 U2 7 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD NOV PY 1995 VL 11 IS 11 BP 1413 EP 1416 DI 10.1089/aid.1995.11.1413 PG 4 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA TG264 UT WOS:A1995TG26400013 PM 8573400 ER PT J AU MARTIN, JR AF MARTIN, JR TI THE SENSITIVE INDIVIDUAL AND THE INDOOR ENVIRONMENT - CASE-STUDY SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article AB This case study describes an indoor environment investigation initiated in response to numerous health and comfort complaints suspected of being associated with a two-story office building. Conventional indoor environment investigation techniques were applied in an attempt to identify one or several contributing factors, such as inadequate outdoor air ventilation and the presence of a respiratory irritant. The air quality satisfaction percentage in the building was well above 80%; however, at least one individual was experiencing a fairly severe reaction only upon entering the subject building. Evaluating the building indoor conditions as acceptable without attempting to address ail possible building-related causes and communicating findings to interested occupants would likely have resulted in more occupant complaints and increased the potential for hysteria conditions. This investigation necessarily addressed a sensitive individual and involved an occupational physician as a constructive participant in the investigation. RP MARTIN, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,MAILSTOP L-384,LIVERMORE,CA 94551, USA. NR 16 TC 2 Z9 2 U1 0 U2 1 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD NOV PY 1995 VL 56 IS 11 BP 1121 EP 1126 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA TD156 UT WOS:A1995TD15600011 PM 7502995 ER PT J AU BARCELLOSHOFF, MH EHRHART, EJ KALIA, M JIRTLE, R FLANDERS, K TSANG, MLS AF BARCELLOSHOFF, MH EHRHART, EJ KALIA, M JIRTLE, R FLANDERS, K TSANG, MLS TI IMMUNOHISTOCHEMICAL DETECTION OF ACTIVE TRANSFORMING GROWTH-FACTOR-BETA IN-SITU USING ENGINEERED TISSUE SO AMERICAN JOURNAL OF PATHOLOGY LA English DT Article ID MOLECULAR-WEIGHT COMPLEX; HUMAN-PLATELETS; FACTOR-BETA-1; EXPRESSION; LOCALIZATION; GROWTH-FACTOR-BETA-1; PRECURSOR; CELLS; ANTIBODIES; REPAIR AB The biological activity of transforming growth factor-beta 1 (TGF-beta) is governed by dissociation from its latent complex. Immunohistochemical discrimination of active and latent TGF-beta could provide insight into TGF-beta activation in physiological and pathological processes, However, evaluation of immunoreactivity specificity in situ has been hindered by the lack of tissue in which TGF-beta status is known. To provide in situ analysis of antibodies to differentiate between these functional forms, we used xenografts of human tumor cells modified by transfection to overexpress latent TGF-beta or constitutively active TGF-beta This comparison revealed that, whereas most antibodies did not differentiate between TGF-beta activation status, the immunoreactivity of some antibodies was activation dependent. Two widely used peptide antibodies to the amino-terminus of TGF-beta, LC(1-30) and CC(1-30) showed marked preferential immunoreactivity with active TGF-beta versus latent TGP-beta in cryosections However, is formalin-fixed, paraffin-embedded tissue, discrimination of active TGF-beta by CC(1-30) was lost and immunoreactivity was distinctly extracellular, as previously reported for this antibody. Similar processing-dependent extracellular localization was found with a neutralizing antibody raised to recombinant TGF-beta. Antigen retrieval recovered cell-associated immunoreactivity of both antibodies. Two antibodies to peptides 78-109 showed mild to moderate preferential immunoreactivity with active TGF-beta only in paraffin sections LC(1-30) was the only antibody tested that discriminated active from latent TGF-beta in both frozen and paraffin-embedded tissue. Thus, in situ discrimination of active versus latent TGF-beta depends on both the antibody and tissue preparation. We propose that tissues engineered to express a specific form of a given protein provide a physiological setting in which to evaluate antibody reactivity with specific forms of a protein. C1 COLORADO STATE UNIV, DEPT RADIOL HLTH SCI, FT COLLINS, CO 80523 USA. DUKE UNIV, MED CTR, DEPT RADIAT ONCOL, DURHAM, NC USA. NCI, CHEMOPREVENT LAB, BETHESDA, MD 20892 USA. R&D SYST INC, MINNEAPOLIS, MN USA. RP BARCELLOSHOFF, MH (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 74,RM 157, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 27 TC 71 Z9 71 U1 0 U2 2 PU AMER SOC INVESTIGATIVE PATHOLOGY, INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3993 USA SN 0002-9440 J9 AM J PATHOL JI Am. J. Pathol. PD NOV PY 1995 VL 147 IS 5 BP 1228 EP 1237 PG 10 WC Pathology SC Pathology GA TD741 UT WOS:A1995TD74100008 PM 7485387 ER PT J AU CALDEIRA, K AF CALDEIRA, K TI LONG-TERM CONTROL OF ATMOSPHERIC CARBON-DIOXIDE - LOW-TEMPERATURE SEA-FLOOR ALTERATION OR TERRESTRIAL SILICATE-ROCK WEATHERING SO AMERICAN JOURNAL OF SCIENCE LA English DT Review ID OCEANIC-CRUST; GEOCHEMICAL CYCLE; HYDROTHERMAL ALTERATION; PELAGIC CARBONATE; TROODOS-OPHIOLITE; REACTION-RATES; LAYER-II; SEAWATER; CO2; DISSOLUTION AB Accumulation of authigenic carbonate in the basaltic ocean basement during low-temperature alteration has been proposed as a major sink for carbon in the oceans and atmosphere, Francois and Walker (1992) suggested that seafloor alteration, and not the terrestrial silicate-rock weathering feedback, is the most important factor determining long-term steady-state atmospheric COP concentrations, They suggested that basalt dissolution and carbonate accumulation in the ocean basement is proportional to the deep-ocean hydrogen-ion and total carbon concentrations; however, they recognized that their parameterization was a first estimate that should be improved, In this work, I develop an improved parameterization and incorporate it in a global carbon-cycle model, Silicate-mineral dissolution rates have been found to be nearly independent of pH in the pH range 5 to 8 in a wide variety of experiments, Because deep-ocean PH is > 7.5, low-temperature sea-floor basalt alteration is not likely to be an effective feedback on atmospheric CO2, If proposed terrestrial silicate-rock weathering formulations are at least approximately correct, then CO2 consumption by terrestrial weathering Is several orders of magnitude more sensitive to changes in atmosphere and ocean CO2 concentration than is CO2 consumption by low-temperature seafloor alteration, This suggests that silicate-rock weathering on land, and not low-temperature seafloor basalt alteration, has been the primary control on long-term atmospheric CO2 content, Nevertheless, ocean basement carbonate accumulation should be included in global carbon budgets and may impact atmospheric CO2 content by affecting the degassing of CO2 during subduction zone metamorphism. RP CALDEIRA, K (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,7000 E AVE,L-256,LIVERMORE,CA 94550, USA. RI Caldeira, Ken/E-7914-2011 NR 99 TC 37 Z9 37 U1 3 U2 13 PU KLINE GEOLOGY LABORATORY PI NEW HAVEN PA YALE UNIV, NEW HAVEN, CT 06520 SN 0002-9599 J9 AM J SCI JI Am. J. Sci. PD NOV PY 1995 VL 295 IS 9 BP 1077 EP 1114 PG 38 WC Geosciences, Multidisciplinary SC Geology GA TD748 UT WOS:A1995TD74800003 ER PT J AU Werner, AJ Hochella, MF Guthrie, GD Hardy, JA Aust, AE Rimstidt, JD AF Werner, AJ Hochella, MF Guthrie, GD Hardy, JA Aust, AE Rimstidt, JD TI Asbestiform riebeckite (crocidolite) dissolution in the presence of Fe chelators: Implications for mineral-induced disease SO AMERICAN MINERALOGIST LA English DT Article ID TRANSMISSION ELECTRON-MICROSCOPE; REACTIVE OXYGEN METABOLITES; CHRYSOTILE ASBESTOS; HYDROTHERMAL CONDITIONS; IRON MOBILIZATION; AUGER-ELECTRON; STRAND BREAKS; SURFACE; REDUCTION; RADICALS AB X-ray photoelectron spectroscopy (XPS) and solution chemistry were used to monitor the changes in surface composition of crocidolite fibers in a 50 mM NaCl solution at pH = 7.5 and 22 degrees C in the presence of several Fe chelators(citrate, EDTA, or desferrioxamine) for up to 30 d. The data show that the introduction of Fe chelators dramatically increases the rate at which Fe is released from the surface in comparison with a control group to which no chelators were added. In particular, XPS shows that Fe3+ is more effectively removed in the presence of the chelators even though it is highly insoluble in aqueous solutions at near neutral pH. This suggests that Fe chelators can alter the dissolution mechanism of amphiboles from the process that dominates in NaCl solutions. This change in dissolution mechanism (particularly the enhanced rate of Fe release) is an important consideration for models of mineral-induced pathogenesis that rely on oxidation and reduction processes. Efforts were made to estimate the Fe-release lifetimes of crocidolite fibers under the conditions of our experiments to guide the assessment of the biodurability of these fibers in human lung tissue. Our results suggest that crocidolite fibers may persist for several years, releasing Fe to lung fluids during this time. This estimated lifetime is longer than that previously estimated for chrysotile fibers and is consistent with the lifetimes previously observed in asbestos mineral lung-burden studies. C1 VIRGINIA POLYTECH INST & STATE UNIV, DEPT GEOL SCI, BLACKSBURG, VA 24061 USA. LOS ALAMOS NATL LAB, GEOL & GEOCHEM GRP, LOS ALAMOS, NM 87545 USA. UTAH STATE UNIV, DEPT CHEM & BIOCHEM, LOGAN, UT 84332 USA. RI Rimstidt, James/N-8910-2013 NR 72 TC 25 Z9 25 U1 0 U2 8 PU MINERALOGICAL SOC AMER PI CHANTILLY PA 3635 CONCORDE PKWY STE 500, CHANTILLY, VA 20151-1125 USA SN 0003-004X EI 1945-3027 J9 AM MINERAL JI Am. Miner. PD NOV-DEC PY 1995 VL 80 IS 11-12 BP 1093 EP 1103 PG 11 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA TK917 UT WOS:A1995TK91700001 ER PT J AU Gasparik, T Parise, JB Eiben, BA Hriljac, JA AF Gasparik, T Parise, JB Eiben, BA Hriljac, JA TI Stability and structure of a new high-pressure silicate, Na1.8Ca1.1Si6O14 SO AMERICAN MINERALOGIST LA English DT Article ID CRYSTAL-STRUCTURE; PHASE AB Preliminary phase relations for the bulk composition Na2O . CaO . 5SiO(2) were experimentally determined at 8-16 GPa and 950-2300 degrees C, using a split-sphere anvil apparatus (USSA-2000). The dominant phase at pressures between 8 and 14 GPa was a new compound with the ideal formula Na2CaSi6O14; microprobe analyses suggest vacancies that cannot be resolved by X-ray data, resulting in a composition better expressed as Na1.8Ca1.1Si6O14. Single crystals suitable for structure determination were synthesized at 14 GPa and 1900 degrees C. Two independent sets of X-ray diffraction data were collected on different crystals from the same batch: one with a conventional diffractometer and the other using imaging plates and a synchrotron X-ray source. The compound crystallizes in space group P321 with a = 7.903(2) and c = 4.595(1) Angstrom. Its structure consists of layers in (001); one is centered at z = 0 and contains the (Ca,Na) and Si-[6] sites. The other, centered at z = 1/2, is a sheet of corner-linked Si-[4] tetrahedra composed of open-branched crankshaft vierer chains linked by single tetrahedra. Although the SiO6 octahedra are close to regular, with Si-O = 1.789(2) Angstrom, the two symmetry-independent SiO4 tetrahedra are distorted as a result of underbonding between O atoms bonding outside the sheet, with Si1-O = 1.557(2) and 1.638(2) Angstrom, and Si2-O = 1.619(1) and 1.648(2) Angstrom. Half-normal probability plots show the positional parameters derived from the two data sets to be statistically equivalent. C1 RUTGERS STATE UNIV,DEPT GEOL SCI,NEW BRUNSWICK,NJ 08903. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP Gasparik, T (reprint author), SUNY STONY BROOK,DEPT EARTH & SPACE SCI,CTR HIGH PRESSURE RES,STONY BROOK,NY 11794, USA. NR 18 TC 33 Z9 34 U1 0 U2 1 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1130 17TH ST NW SUITE 330, WASHINGTON, DC 20036 SN 0003-004X J9 AM MINERAL JI Am. Miner. PD NOV-DEC PY 1995 VL 80 IS 11-12 BP 1269 EP 1276 PG 8 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA TK917 UT WOS:A1995TK91700017 ER PT J AU Ritchie, RO Gilbert, CJ AF Ritchie, RO Gilbert, CJ TI Resistance to cyclic fatigue of silicon carbide ceramics at ambient and elevated temperatures SO ANALES DE LA ASOCIACION QUIMICA ARGENTINA LA English DT Article; Proceedings Paper CT 1st Argentina/US Bilateral Symposium on Materials Science and Engineering (FAUSASMAT 95) CY NOV 12-16, 1995 CL UNIV BUENOS AIRES, BUENOS AIRES, ARGENTINA SP Comis Nacl Energia Atom, Argentina, Minist Def, Direc Gen Investigac Desarrollo, Argentina, Inst Investigac Cient & Tecn Fuerzas Armadas, Argentina HO UNIV BUENOS AIRES ID CRACK-GROWTH; MECHANICAL-PROPERTIES; FRICTIONAL-WEAR; ALUMINA; TOUGHNESS; MICROSTRUCTURE; BEHAVIOR AB Mechanisms governing the fracture toughness and fatigue-crack growth properties of new, in situ toughened silicon carbide ceramic, with Al, B and C additives, are examined at both ambient and elevated temperatures (22-1200 degrees C). Compared to behavior in commercial SiC (Hexoloy SA), his material displays over a three-fold increase in toughness (Kc greater than or equal to 9 MPa root m), but is susceptible to cyclic fatigue failure. It is shown that whereas grain bridging that is responsible for cyclic fatigue failure. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP Ritchie, RO (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 21 TC 0 Z9 0 U1 0 U2 0 PU ASOC QUIMICA ARGENTINA PI BUENOS AIRES PA SANCHEZ DE BUSTAMANTE 1749, 1425 BUENOS AIRES, ARGENTINA SN 0365-0375 J9 AN ASOC QUIM ARGENT JI An. Asoc. Quim. Argent. PD NOV-DEC PY 1995 VL 83 IS 6 BP 307 EP 315 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA VU784 UT WOS:A1995VU78400001 ER PT J AU VANBERKEL, GJ ZHOU, FM AF VANBERKEL, GJ ZHOU, FM TI ELECTROSPRAY AS A CONTROLLED CURRENT ELECTROLYTIC CELL - ELECTROCHEMICAL IONIZATION OF NEUTRAL ANALYTES FOR DETECTION BY ELECTROSPRAY MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID ION SPRAY; MECHANISM; SPECTRA AB In this paper an electrospray ion source is shown to be a controlled-current electrolytic now cell which, when operated so that three key requirements are met, can be used for efficient neutral analyte ionization (i,e,, complete analyte electrolysis) and sensitive gas-phase detection (i,e., minimized gas-phase signal suppression) in electrospray mass spectrometry (ES-MS), These three requirements are as follows: (1) the magnitude of the ES current, i(ES), must be sufficient for the oxidization of the molar equivalent of all species available for reaction in the ES capillary that are as easily or more easily oxidized than the targeted analyte, including all of the analyte; (2) the analyte must be available for reaction at the metal/solution interface in the ES capillary; and (3) the steps taken to ensure the first two requirements must not inhibit the formation of gas-phase ions from the ions generated electrolytically in solution. The means to meet these requirements are discussed, including the addition of an appropriate electrolyte to the electrosprayed solutions (e,g,, lithium triflate), the use of slower now rates (e.g., 5.0 vs 40 mu L/min), and the use of a platinum capillary in the ES device, rather than the more commonly used stainless steel capillary. Neutral metallocenes, metalloporphyrins, and polycyclic aromatic hydrocarbons are used as the model compounds, Operation of the ES ion source in the manner described expands the neutral compound types amenable to low level detection by ES-MS to include even those that are relatively difficult to oxidize (i,e,, E > 1.0 V vs SCE) and, therefore, also expands the universality of ES as an ionization source, From the electrochemical point of view, this operation of the ES ion source might be viewed as a means to provide molecular weight information, and possibly the structure, for the ionic products formed during a controlled-current electrolysis experiment. RP VANBERKEL, GJ (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 31 TC 97 Z9 98 U1 3 U2 22 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 1 PY 1995 VL 67 IS 21 BP 3958 EP 3964 DI 10.1021/ac00117a022 PG 7 WC Chemistry, Analytical SC Chemistry GA TC809 UT WOS:A1995TC80900027 ER PT J AU MORELLI, JP BUNTING, RJ COWLEY, SWH FARRUGIA, CJ FREEMAN, MP FRIISCHRISTENSEN, E JONES, GOL LESTER, M LEWIS, RV LUBR, H ORR, D PINNOCK, M REEVES, GD WILLIAMS, PJS YEOMAN, TK AF MORELLI, JP BUNTING, RJ COWLEY, SWH FARRUGIA, CJ FREEMAN, MP FRIISCHRISTENSEN, E JONES, GOL LESTER, M LEWIS, RV LUBR, H ORR, D PINNOCK, M REEVES, GD WILLIAMS, PJS YEOMAN, TK TI RADAR OBSERVATIONS OF AURORAL-ZONE FLOWS DURING A MULTIPLE-ONSET SUBSTORM SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Article ID WESTWARD TRAVELING SURGE; TWO-DIMENSIONAL OBSERVATIONS; GROUND-BASED OBSERVATIONS; HIGH-LATITUDE IONOSPHERE; SOLAR-WIND CONTROL; ELECTRIC-FIELDS; MAGNETOSPHERIC SUBSTORMS; MAGNETIC OBSERVATIONS; GEOMAGNETIC-ACTIVITY; CURRENT SYSTEMS AB We present an analysis of ground magnetic field, ionospheric flow, geosynchronous particle, and interplanetary data during a multiple-onset substorm on 12 April 1988. Our principal results concern the modulations of the ionospheric flow which occur during the impulsive electrojet activations associated with each onset. During the first hour of the disturbance these take place every similar to 12.5 min and involve the formation of a new intense westward current filament in the premidnight sector, just poleward of the preexisting extended current system driven by the large-scale flow. These filaments are similar to 1 h MLT wide (similar to 600 km), and initially expand poleward to a width of similar to 300 km before contracting equatorward and coalescing with the preexisting current, generally leaving the latter enhanced in magnitude and/or expanded in latitude. Within the impulsive electrojets the flow is found to be suppressed to values 50-100 m s(-1) or less during the first few minutes, before surging equatorward at 0.5-1.0 km s (-1) during the phase of rapid coalescence. The implication is that the precipitation-induced Hall conductivity within the impulsive electrojet initially rises to exceed similar to 100 mho, before decaying over a few minutes. This value compares with Hall conductivities of similar to 20 mho in the quasi-steady current regions, and a few mho or less in the regions poleward of the electrojets and in the preonset ionosphere. Preliminary evidence has also been found that the flow surges propagate from midnight to the morning sector where they are associated with arrested equatorward motion or poleward contractions of the current system. These observations are discussed in terms of present theoretical paradigms of the global behaviour of fields and flows which occur during substorms. C1 UNIV LONDON IMPERIAL COLL SCI & TECHNOL,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. BRITISH ANTARCTIC SURVEY,CAMBRIDGE CB3 0ET,ENGLAND. DANISH METEOROL INST,DK-2100 COPENHAGEN,DENMARK. UNIV LEICESTER,DEPT PHYS,LEICESTER LE1 7RH,LEICS,ENGLAND. UNIV COLL WALES,DEPT PHYS,ABERYSTWYTH SY23 3BZ,DYFED,WALES. TECH UNIV CAROLO WILHELMINA BRAUNSCHWEIG,D-38106 BRAUNSCHWEIG,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RI Yeoman, Timothy/L-9105-2014; Reeves, Geoffrey/E-8101-2011 OI Yeoman, Timothy/0000-0002-8434-4825; Reeves, Geoffrey/0000-0002-7985-8098 NR 63 TC 37 Z9 37 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD NOV PY 1995 VL 13 IS 11 BP 1144 EP 1163 DI 10.1007/s005850050255 PG 20 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA TG061 UT WOS:A1995TG06100003 ER PT J AU Saunders, JA Toran, LE AF Saunders, JA Toran, LE TI Modeling of radionuclide and heavy metal sorption around low- and high-pH waste disposal sites at Oak Ridge, Tennessee SO APPLIED GEOCHEMISTRY LA English DT Article ID UNSATURATED TRANSPORT PROCESSES; HETEROGENEOUS POROUS-MEDIA; OXIDE-WATER INTERFACE; MANGANESE OXIDES; SELECTIVE DISSOLUTION; ADSORPTION; SOILS; IRON; SEDIMENTS; IONS AB Modeling of mineral precipitation and metal sorption reactions using MINTEQA2 and the Fe oxyhydroxide diffuse-layer model has provided insights into geochemical processes governing contaminant migration from low-level radioactive waste disposal sites at the U.S. Department of Energy's Oak Ridge National Laboratory and Y-12 Plant at Oak Ridge, Tennessee. Both acidic and basic nuclear-fuel reprocessing wastes, locally mixed with decontamination solvents, were disposed of in unlined trenches and lagoons. Model results show that as wastes move toward neutral pH due to reactions with surrounding soils and saprolite, mineral precipitation and sorption can limit the solubility of heavy metals and radionuclides. However, observed contaminant levels in monitoring wells indicate that at least locally, wastes are moving in faults and fractures and are not retarded by sorption reactions along such flow paths. Model results also support previous studies indicating that organic complexing agents used in decontamination procedures can enhance radionuclide and heavy metal solubility when mixed with nuclear fuel reprocessing wastes. However, complex interactions between metal-organic complexes and mineral surfaces and natural organic matter, biodegradation, and fracture flow complicate the interpretation of contaminant mobility. C1 OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. RP Saunders, JA (reprint author), AUBURN UNIV, DEPT GEOL, AUBURN, AL 36849 USA. NR 67 TC 32 Z9 32 U1 1 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0883-2927 J9 APPL GEOCHEM JI Appl. Geochem. PD NOV PY 1995 VL 10 IS 6 BP 673 EP 684 DI 10.1016/0883-2927(95)00036-4 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA TR311 UT WOS:A1995TR31100005 ER PT J AU KOWALSKI, MP BARBEE, TW CRUDDACE, RG SEELY, JF RIFE, JC HUNTER, WR AF KOWALSKI, MP BARBEE, TW CRUDDACE, RG SEELY, JF RIFE, JC HUNTER, WR TI EFFICIENCY AND LONG-TERM STABILITY OF A MULTILAYER-COATED, ION-ETCHED BLAZED HOLOGRAPHIC GRATING IN THE 125-133-ANGSTROM WAVELENGTH REGION SO APPLIED OPTICS LA English DT Article DE DIFFRACTION GRATING; MULTILAYER COATING; EXTREME ULTRAVIOLET ID SYNCHROTRON RADIATION; PERFORMANCE; OPERATION; CARBON AB The efficiency of an ion-etched blazed holographic grating was measured by the use of synchrotron radiation in the 125-133-Angstrom wavelength range and at near-normal incidence. The grating had a Mo-Si multilayer interference coating that resulted in a peak normal-incidence efficiency of 13% in the second grating order and at a wavelength of 128 Angstrom. This is the highest efficiency obtained to date from a multilayer-coated grating in this wavelength region and at normal incidence. These measurements are compared with similar measurements performed on the same grating 4.5 years later. Over this time the peak grating efficiency decreased from 13% to 8%, and this result is attributed to the decrease in the reflectance of the multilayer coating from 55% to 42%. Oxidation and contamination of the multilayer with carbon appear to be the causes of these losses. The groove efficiency of the grating substrate in the second order is 23%. (C) 1995 Optical Society of America C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. SFA INC,LANDOVER,MD 20785. RP KOWALSKI, MP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 22 Z9 22 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1995 VL 34 IS 31 BP 7338 EP 7346 PG 9 WC Optics SC Optics GA TC983 UT WOS:A1995TC98300029 PM 21060607 ER PT J AU SEELY, JF CRUDDACE, RG KOWALSKI, MP HUNTER, WR BARBEE, TW RIFE, JC EBY, R STOLT, KG AF SEELY, JF CRUDDACE, RG KOWALSKI, MP HUNTER, WR BARBEE, TW RIFE, JC EBY, R STOLT, KG TI POLARIZATION AND EFFICIENCY OF A CONCAVE MULTILAYER GRATING IN THE 135-250-ANGSTROM REGION AND IN NORMAL-INCIDENCE AND SEYA-NAMIOKA MOUNTS SO APPLIED OPTICS LA English DT Article ID CRYSTAL MONOCHROMATOR; PERFORMANCE; OPERATION AB A molybdenum/silicon multilayer coating was applied to a holographic ion-etched blazed grating substrate that had 2400 grooves/mm and a radius of curvature of 2.2 m. Scanning probe microscopy yielded the same surface microroughness (5 Angstrom rms) before and after deposition of the multilayer. The efficiency and polarization performance of the grating was measured by synchrotron radiation in the 135-250-Angstrom wavelength region. In the second grating order and the second Bragg order of the multilayer coating, the peak normal-incidence efficiency was 7.5% at a wavelength of 147 Angstrom, representing a groove efficiency of 27%. At an angle of incidence of 35 degrees, the polarization performance of the grating was 95%-100% in the 210-250-Angstrom wavelength region. In a Seya-Namioka spectrometer mount at an angle of incidence of 30 degrees-40 degrees, the grating is a nearly perfect polarizing optical element in the wavelength bands between 125 and 300 Angstrom, which are covered by the multilayer coating. (C) 1995 Optical Society of America C1 SFA INC,LANDOVER,MD 20785. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. TOPOMETRIX CORP,BEDMINSTER,NJ 07921. ANALYT ANSWERS INC,WOBURN,MA. RP SEELY, JF (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 13 TC 23 Z9 23 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1995 VL 34 IS 31 BP 7347 EP 7354 PG 8 WC Optics SC Optics GA TC983 UT WOS:A1995TC98300030 PM 21060608 ER PT J AU SUN, LC MOORTHY, AR KAPLAN, E BAUM, JW MEINHOLD, CB AF SUN, LC MOORTHY, AR KAPLAN, E BAUM, JW MEINHOLD, CB TI ASSESSMENT OF PLUTONIUM EXPOSURES IN RONGELAP AND UTIRIK POPULATIONS BY FISSION-TRACK ANALYSIS OF URINE SO APPLIED RADIATION AND ISOTOPES LA English DT Article; Proceedings Paper CT 1st International Symposium on Plutonium in the Environment CY JUL 06-08, 1994 CL OTTAWA, CANADA SP Int Comm Radionuclide Metrology ID EXCRETION AB A nuclear device, code-named Brave, detonated at Bikini Atoll at 6:45 a.m. on 1 March 1954, unexpectedly released a large amount of radioactivity. Over 40 years after this incident, the study of its impact on the radiological health and environmental safety of the residents of Rongelap and Utirik Atolls continues. In 1987, researchers at Brookhaven National Laboratory established a fission track analysis (FTA) method for low-level Pu-239 urinalysis. Two years later, a new shipboard protocol was developed for collecting 24-h radiologically clean urine samples. The purpose of this paper is to update information on the FTA method for measuring low-levels of plutonium, and to summarize results on the distribution of Pu-239 in the populations of Rongelap and Utirik between 1981-1991. Plutonium detection levels (99% confidence level) in these samples were 2-3 mu Bq, which is equivalent to 0.2-0.3 mSv effective dose equivalent (EDE) to age 70 for Marshallese. The latest 1991 FTA data Indicate average EDE of 0.62 mSv and 1.6 mSv for the people of Rongelap and Utirik, respectively, which both are the highest values since 1988. RP SUN, LC (reprint author), BROOKHAVEN NATL LAB,DEPT ADV TECHNOL,DIV RADIOL SCI,UPTON,NY 11973, USA. NR 39 TC 11 Z9 12 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD NOV PY 1995 VL 46 IS 11 BP 1259 EP 1269 DI 10.1016/0969-8043(95)00169-E PG 11 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA TG274 UT WOS:A1995TG27400021 PM 8535424 ER PT J AU HUEBER, DM STEVENSON, CL VO-DINH, T AF HUEBER, DM STEVENSON, CL VO-DINH, T TI FAST SCANNING SYNCHRONOUS LUMINESCENCE SPECTROMETER BASED ON ACOUSTOOPTIC TUNABLE FILTERS SO APPLIED SPECTROSCOPY LA English DT Article DE SYNCHRONOUS LUMINESCENCE; FLUORESCENCE; INSTRUMENTATION; ACOUSTOOPTIC TUNABLE FILTER ID SPECTROSCOPY AB A new luminescence spectrometer based on quartz-collinear acoustooptic tunable filters (AOTFs) and capable of synchronous scanning is described. An acousto-optic tunable filter is an electronically tunable optical bandpass filter. Unlike a tunable grating monochromator, an AOTF has no moving mechanical parts, and an AOTF can be tuned to any wavelength within its operating range in microseconds. These characteristics, combined with the small size of these devices, make AOTFs an important new alternative to conventional monochromators, especially for portable instrumentation. The relevant performance of the AOTFs (efficiency, bandwidth, rejection, etc.) is compared with that of typical small-grating monochromator. C1 OAK RIDGE NATL LAB, DIV HLTH SCI RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 19 TC 21 Z9 21 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 5320 SPECTRUM DRIVE SUITE C, FREDERICK, MD 21703 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD NOV PY 1995 VL 49 IS 11 BP 1624 EP 1631 DI 10.1366/0003702953965830 PG 8 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA TG075 UT WOS:A1995TG07500011 ER PT J AU BLAIR, DS BURGESS, LW BRODSKY, AM AF BLAIR, DS BURGESS, LW BRODSKY, AM TI STUDY OF ANALYTE DIFFUSION INTO A SILICONE-CLAD FIBEROPTIC CHEMICAL SENSOR BY EVANESCENT-WAVE SPECTROSCOPY SO APPLIED SPECTROSCOPY LA English DT Article DE EVANESCENT WAVE; INFRARED SPECTROSCOPY; FIBER OPTIC; CHEMICAL SENSOR; DIFFUSION; POLYMER; POLYSILOXANE; SILICONE; POLY(DIMETHYLSILOXANE); MASS TRANSPORT; METHANOL; ETHANOL; 2-PROPANOL; N-BUTANOL; PENTANE; HEXANE; HEPTANE; CYCLOHEXANE; FICK 2ND LAW; DIFFUSION COEFFICIENT; INTERFACIAL CONDUCTANCE ID ABSORBENCY SENSOR; POLYMER MEMBRANES; ORGANIC-COMPOUNDS; NATURAL-RUBBER; ABSORPTION; CONTAMINANTS; SORPTION; NEOPRENE; LIQUIDS; LASER AB The diffusion rates of various polar and nonpolar analytes in dimethylsiloxane were examined with the use of a commercially available 200-mu m silica-core/300-mu m silicone-clad fiber as the optical element for evanescent wave spectroscopy in the near-infrared spectral region. An analytical solution to Fick's second law was used to model the time-dependent analyte concentration at the core/cladding interface. Successful fit of the analytical solutions to infrared data verifies the assumption of constant diffusion coefficients that is necessary to solve the equation. Transport rates of polar analytes in silicone can be estimated with the use of a single-parameter model that results in diffusion coefficients of 3.2 x 10(-6), 1.6 x 10(-6), 8.1 x 10(-7), and 3.9 x 10(-7) cm(2)/s for methanol, ethanol, 2-propanol, and n-butanol, respectively. Estimating the transport of larger nonpolar analytes in the silicone cladding requires a two-parameter model that includes a diffusion coefficient and an interfacial conductance term. For pentane, hexane, heptane, and cyclohexane the resultant diffusion coefficients and interfacial conductance parameters are 6.9 x 10(-7), 4.6 x 10(-7), 4.4 x 10(-7), and 2.3 x 10(-7) cm(2)/s and 2500, 2000, 2000, and 600 mu m(-1), respectively. C1 UNIV WASHINGTON,CTR PROC ANALYT CHEM,SEATTLE,WA 98195. RP BLAIR, DS (reprint author), SANDIA NATL LABS,DEPT ENVIRONM CHARACTERIZAT & MONITORING SYST,ALBUQUERQUE,NM 87185, USA. NR 38 TC 23 Z9 23 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD NOV PY 1995 VL 49 IS 11 BP 1636 EP 1645 DI 10.1366/0003702953965740 PG 10 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA TG075 UT WOS:A1995TG07500013 ER EF